Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2003-2006, Cluster File Systems, Inc, info@clusterfs.com |
| 3 | * Written by Alex Tomas <alex@clusterfs.com> |
| 4 | * |
| 5 | * Architecture independence: |
| 6 | * Copyright (c) 2005, Bull S.A. |
| 7 | * Written by Pierre Peiffer <pierre.peiffer@bull.net> |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License version 2 as |
| 11 | * published by the Free Software Foundation. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public Licens |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111- |
| 21 | */ |
| 22 | |
| 23 | /* |
| 24 | * Extents support for EXT4 |
| 25 | * |
| 26 | * TODO: |
| 27 | * - ext4*_error() should be used in some situations |
| 28 | * - analyze all BUG()/BUG_ON(), use -EIO where appropriate |
| 29 | * - smart tree reduction |
| 30 | */ |
| 31 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 32 | #include <linux/fs.h> |
| 33 | #include <linux/time.h> |
Mingming Cao | cd02ff0 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 34 | #include <linux/jbd2.h> |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 35 | #include <linux/highuid.h> |
| 36 | #include <linux/pagemap.h> |
| 37 | #include <linux/quotaops.h> |
| 38 | #include <linux/string.h> |
| 39 | #include <linux/slab.h> |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 40 | #include <asm/uaccess.h> |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 41 | #include <linux/fiemap.h> |
Christoph Hellwig | 3dcf545 | 2008-04-29 18:13:32 -0400 | [diff] [blame] | 42 | #include "ext4_jbd2.h" |
Theodore Ts'o | 4a092d7 | 2012-11-28 13:03:30 -0500 | [diff] [blame] | 43 | #include "ext4_extents.h" |
Tao Ma | f19d587 | 2012-12-10 14:05:51 -0500 | [diff] [blame] | 44 | #include "xattr.h" |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 45 | |
Jiaying Zhang | 0562e0b | 2011-03-21 21:38:05 -0400 | [diff] [blame] | 46 | #include <trace/events/ext4.h> |
| 47 | |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 48 | /* |
| 49 | * used by extent splitting. |
| 50 | */ |
| 51 | #define EXT4_EXT_MAY_ZEROOUT 0x1 /* safe to zeroout if split fails \ |
| 52 | due to ENOSPC */ |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 53 | #define EXT4_EXT_MARK_UNWRIT1 0x2 /* mark first half unwritten */ |
| 54 | #define EXT4_EXT_MARK_UNWRIT2 0x4 /* mark second half unwritten */ |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 55 | |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 56 | #define EXT4_EXT_DATA_VALID1 0x8 /* first half contains valid data */ |
| 57 | #define EXT4_EXT_DATA_VALID2 0x10 /* second half contains valid data */ |
| 58 | |
Darrick J. Wong | 7ac5990 | 2012-04-29 18:37:10 -0400 | [diff] [blame] | 59 | static __le32 ext4_extent_block_csum(struct inode *inode, |
| 60 | struct ext4_extent_header *eh) |
| 61 | { |
| 62 | struct ext4_inode_info *ei = EXT4_I(inode); |
| 63 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
| 64 | __u32 csum; |
| 65 | |
| 66 | csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)eh, |
| 67 | EXT4_EXTENT_TAIL_OFFSET(eh)); |
| 68 | return cpu_to_le32(csum); |
| 69 | } |
| 70 | |
| 71 | static int ext4_extent_block_csum_verify(struct inode *inode, |
| 72 | struct ext4_extent_header *eh) |
| 73 | { |
| 74 | struct ext4_extent_tail *et; |
| 75 | |
| 76 | if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, |
| 77 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) |
| 78 | return 1; |
| 79 | |
| 80 | et = find_ext4_extent_tail(eh); |
| 81 | if (et->et_checksum != ext4_extent_block_csum(inode, eh)) |
| 82 | return 0; |
| 83 | return 1; |
| 84 | } |
| 85 | |
| 86 | static void ext4_extent_block_csum_set(struct inode *inode, |
| 87 | struct ext4_extent_header *eh) |
| 88 | { |
| 89 | struct ext4_extent_tail *et; |
| 90 | |
| 91 | if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, |
| 92 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) |
| 93 | return; |
| 94 | |
| 95 | et = find_ext4_extent_tail(eh); |
| 96 | et->et_checksum = ext4_extent_block_csum(inode, eh); |
| 97 | } |
| 98 | |
Allison Henderson | d583fb8 | 2011-05-25 07:41:43 -0400 | [diff] [blame] | 99 | static int ext4_split_extent(handle_t *handle, |
| 100 | struct inode *inode, |
| 101 | struct ext4_ext_path *path, |
| 102 | struct ext4_map_blocks *map, |
| 103 | int split_flag, |
| 104 | int flags); |
| 105 | |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 106 | static int ext4_split_extent_at(handle_t *handle, |
| 107 | struct inode *inode, |
| 108 | struct ext4_ext_path *path, |
| 109 | ext4_lblk_t split, |
| 110 | int split_flag, |
| 111 | int flags); |
| 112 | |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 113 | static int ext4_find_delayed_extent(struct inode *inode, |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 114 | struct extent_status *newes); |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 115 | |
Jan Kara | 487caee | 2009-08-17 22:17:20 -0400 | [diff] [blame] | 116 | static int ext4_ext_truncate_extend_restart(handle_t *handle, |
| 117 | struct inode *inode, |
| 118 | int needed) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 119 | { |
| 120 | int err; |
| 121 | |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 122 | if (!ext4_handle_valid(handle)) |
| 123 | return 0; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 124 | if (handle->h_buffer_credits > needed) |
Shen Feng | 9102e4f | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 125 | return 0; |
| 126 | err = ext4_journal_extend(handle, needed); |
Theodore Ts'o | 0123c93 | 2008-08-01 20:57:54 -0400 | [diff] [blame] | 127 | if (err <= 0) |
Shen Feng | 9102e4f | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 128 | return err; |
Jan Kara | 487caee | 2009-08-17 22:17:20 -0400 | [diff] [blame] | 129 | err = ext4_truncate_restart_trans(handle, inode, needed); |
Dmitry Monakhov | 0617b83 | 2010-05-17 01:00:00 -0400 | [diff] [blame] | 130 | if (err == 0) |
| 131 | err = -EAGAIN; |
Jan Kara | 487caee | 2009-08-17 22:17:20 -0400 | [diff] [blame] | 132 | |
| 133 | return err; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 134 | } |
| 135 | |
| 136 | /* |
| 137 | * could return: |
| 138 | * - EROFS |
| 139 | * - ENOMEM |
| 140 | */ |
| 141 | static int ext4_ext_get_access(handle_t *handle, struct inode *inode, |
| 142 | struct ext4_ext_path *path) |
| 143 | { |
| 144 | if (path->p_bh) { |
| 145 | /* path points to block */ |
liang xie | 5d60125 | 2014-05-12 22:06:43 -0400 | [diff] [blame] | 146 | BUFFER_TRACE(path->p_bh, "get_write_access"); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 147 | return ext4_journal_get_write_access(handle, path->p_bh); |
| 148 | } |
| 149 | /* path points to leaf/index in inode body */ |
| 150 | /* we use in-core data, no need to protect them */ |
| 151 | return 0; |
| 152 | } |
| 153 | |
| 154 | /* |
| 155 | * could return: |
| 156 | * - EROFS |
| 157 | * - ENOMEM |
| 158 | * - EIO |
| 159 | */ |
Darrick J. Wong | 2656497 | 2013-04-19 14:04:12 -0400 | [diff] [blame] | 160 | int __ext4_ext_dirty(const char *where, unsigned int line, handle_t *handle, |
| 161 | struct inode *inode, struct ext4_ext_path *path) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 162 | { |
| 163 | int err; |
Dmitry Monakhov | 4b1f166 | 2014-07-27 22:28:15 -0400 | [diff] [blame] | 164 | |
| 165 | WARN_ON(!rwsem_is_locked(&EXT4_I(inode)->i_data_sem)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 166 | if (path->p_bh) { |
Darrick J. Wong | 7ac5990 | 2012-04-29 18:37:10 -0400 | [diff] [blame] | 167 | ext4_extent_block_csum_set(inode, ext_block_hdr(path->p_bh)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 168 | /* path points to block */ |
Theodore Ts'o | 9ea7a0d | 2011-09-04 10:18:14 -0400 | [diff] [blame] | 169 | err = __ext4_handle_dirty_metadata(where, line, handle, |
| 170 | inode, path->p_bh); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 171 | } else { |
| 172 | /* path points to leaf/index in inode body */ |
| 173 | err = ext4_mark_inode_dirty(handle, inode); |
| 174 | } |
| 175 | return err; |
| 176 | } |
| 177 | |
Alex Tomas | f65e6fb | 2006-10-11 01:21:05 -0700 | [diff] [blame] | 178 | static ext4_fsblk_t ext4_ext_find_goal(struct inode *inode, |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 179 | struct ext4_ext_path *path, |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 180 | ext4_lblk_t block) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 181 | { |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 182 | if (path) { |
Yongqiang Yang | 81fdbb4 | 2011-10-29 09:23:38 -0400 | [diff] [blame] | 183 | int depth = path->p_depth; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 184 | struct ext4_extent *ex; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 185 | |
Kazuya Mio | ad4fb9c | 2011-01-10 12:12:28 -0500 | [diff] [blame] | 186 | /* |
| 187 | * Try to predict block placement assuming that we are |
| 188 | * filling in a file which will eventually be |
| 189 | * non-sparse --- i.e., in the case of libbfd writing |
| 190 | * an ELF object sections out-of-order but in a way |
| 191 | * the eventually results in a contiguous object or |
| 192 | * executable file, or some database extending a table |
| 193 | * space file. However, this is actually somewhat |
| 194 | * non-ideal if we are writing a sparse file such as |
| 195 | * qemu or KVM writing a raw image file that is going |
| 196 | * to stay fairly sparse, since it will end up |
| 197 | * fragmenting the file system's free space. Maybe we |
| 198 | * should have some hueristics or some way to allow |
| 199 | * userspace to pass a hint to file system, |
Tao Ma | b8d6568 | 2011-01-21 23:21:31 +0800 | [diff] [blame] | 200 | * especially if the latter case turns out to be |
Kazuya Mio | ad4fb9c | 2011-01-10 12:12:28 -0500 | [diff] [blame] | 201 | * common. |
| 202 | */ |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 203 | ex = path[depth].p_ext; |
Kazuya Mio | ad4fb9c | 2011-01-10 12:12:28 -0500 | [diff] [blame] | 204 | if (ex) { |
| 205 | ext4_fsblk_t ext_pblk = ext4_ext_pblock(ex); |
| 206 | ext4_lblk_t ext_block = le32_to_cpu(ex->ee_block); |
| 207 | |
| 208 | if (block > ext_block) |
| 209 | return ext_pblk + (block - ext_block); |
| 210 | else |
| 211 | return ext_pblk - (ext_block - block); |
| 212 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 213 | |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 214 | /* it looks like index is empty; |
| 215 | * try to find starting block from index itself */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 216 | if (path[depth].p_bh) |
| 217 | return path[depth].p_bh->b_blocknr; |
| 218 | } |
| 219 | |
| 220 | /* OK. use inode's group */ |
Eric Sandeen | f86186b | 2011-06-28 10:01:31 -0400 | [diff] [blame] | 221 | return ext4_inode_to_goal_block(inode); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 222 | } |
| 223 | |
Aneesh Kumar K.V | 654b490 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 224 | /* |
| 225 | * Allocation for a meta data block |
| 226 | */ |
Alex Tomas | f65e6fb | 2006-10-11 01:21:05 -0700 | [diff] [blame] | 227 | static ext4_fsblk_t |
Aneesh Kumar K.V | 654b490 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 228 | ext4_ext_new_meta_block(handle_t *handle, struct inode *inode, |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 229 | struct ext4_ext_path *path, |
Allison Henderson | 55f020d | 2011-05-25 07:41:26 -0400 | [diff] [blame] | 230 | struct ext4_extent *ex, int *err, unsigned int flags) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 231 | { |
Alex Tomas | f65e6fb | 2006-10-11 01:21:05 -0700 | [diff] [blame] | 232 | ext4_fsblk_t goal, newblock; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 233 | |
| 234 | goal = ext4_ext_find_goal(inode, path, le32_to_cpu(ex->ee_block)); |
Allison Henderson | 55f020d | 2011-05-25 07:41:26 -0400 | [diff] [blame] | 235 | newblock = ext4_new_meta_blocks(handle, inode, goal, flags, |
| 236 | NULL, err); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 237 | return newblock; |
| 238 | } |
| 239 | |
Theodore Ts'o | 55ad63b | 2009-08-28 10:40:33 -0400 | [diff] [blame] | 240 | static inline int ext4_ext_space_block(struct inode *inode, int check) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 241 | { |
| 242 | int size; |
| 243 | |
| 244 | size = (inode->i_sb->s_blocksize - sizeof(struct ext4_extent_header)) |
| 245 | / sizeof(struct ext4_extent); |
Robert P. J. Day | bbf2f9f | 2007-02-17 19:20:16 +0100 | [diff] [blame] | 246 | #ifdef AGGRESSIVE_TEST |
Yongqiang Yang | 02dc62fb | 2011-10-29 09:29:11 -0400 | [diff] [blame] | 247 | if (!check && size > 6) |
| 248 | size = 6; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 249 | #endif |
| 250 | return size; |
| 251 | } |
| 252 | |
Theodore Ts'o | 55ad63b | 2009-08-28 10:40:33 -0400 | [diff] [blame] | 253 | static inline int ext4_ext_space_block_idx(struct inode *inode, int check) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 254 | { |
| 255 | int size; |
| 256 | |
| 257 | size = (inode->i_sb->s_blocksize - sizeof(struct ext4_extent_header)) |
| 258 | / sizeof(struct ext4_extent_idx); |
Robert P. J. Day | bbf2f9f | 2007-02-17 19:20:16 +0100 | [diff] [blame] | 259 | #ifdef AGGRESSIVE_TEST |
Yongqiang Yang | 02dc62fb | 2011-10-29 09:29:11 -0400 | [diff] [blame] | 260 | if (!check && size > 5) |
| 261 | size = 5; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 262 | #endif |
| 263 | return size; |
| 264 | } |
| 265 | |
Theodore Ts'o | 55ad63b | 2009-08-28 10:40:33 -0400 | [diff] [blame] | 266 | static inline int ext4_ext_space_root(struct inode *inode, int check) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 267 | { |
| 268 | int size; |
| 269 | |
| 270 | size = sizeof(EXT4_I(inode)->i_data); |
| 271 | size -= sizeof(struct ext4_extent_header); |
| 272 | size /= sizeof(struct ext4_extent); |
Robert P. J. Day | bbf2f9f | 2007-02-17 19:20:16 +0100 | [diff] [blame] | 273 | #ifdef AGGRESSIVE_TEST |
Yongqiang Yang | 02dc62fb | 2011-10-29 09:29:11 -0400 | [diff] [blame] | 274 | if (!check && size > 3) |
| 275 | size = 3; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 276 | #endif |
| 277 | return size; |
| 278 | } |
| 279 | |
Theodore Ts'o | 55ad63b | 2009-08-28 10:40:33 -0400 | [diff] [blame] | 280 | static inline int ext4_ext_space_root_idx(struct inode *inode, int check) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 281 | { |
| 282 | int size; |
| 283 | |
| 284 | size = sizeof(EXT4_I(inode)->i_data); |
| 285 | size -= sizeof(struct ext4_extent_header); |
| 286 | size /= sizeof(struct ext4_extent_idx); |
Robert P. J. Day | bbf2f9f | 2007-02-17 19:20:16 +0100 | [diff] [blame] | 287 | #ifdef AGGRESSIVE_TEST |
Yongqiang Yang | 02dc62fb | 2011-10-29 09:29:11 -0400 | [diff] [blame] | 288 | if (!check && size > 4) |
| 289 | size = 4; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 290 | #endif |
| 291 | return size; |
| 292 | } |
| 293 | |
Mingming Cao | d2a1763 | 2008-07-14 17:52:37 -0400 | [diff] [blame] | 294 | /* |
| 295 | * Calculate the number of metadata blocks needed |
| 296 | * to allocate @blocks |
| 297 | * Worse case is one block per extent |
| 298 | */ |
Theodore Ts'o | 01f49d0 | 2011-01-10 12:13:03 -0500 | [diff] [blame] | 299 | int ext4_ext_calc_metadata_amount(struct inode *inode, ext4_lblk_t lblock) |
Mingming Cao | d2a1763 | 2008-07-14 17:52:37 -0400 | [diff] [blame] | 300 | { |
Theodore Ts'o | 9d0be50 | 2010-01-01 02:41:30 -0500 | [diff] [blame] | 301 | struct ext4_inode_info *ei = EXT4_I(inode); |
Yongqiang Yang | 81fdbb4 | 2011-10-29 09:23:38 -0400 | [diff] [blame] | 302 | int idxs; |
Mingming Cao | d2a1763 | 2008-07-14 17:52:37 -0400 | [diff] [blame] | 303 | |
Theodore Ts'o | 9d0be50 | 2010-01-01 02:41:30 -0500 | [diff] [blame] | 304 | idxs = ((inode->i_sb->s_blocksize - sizeof(struct ext4_extent_header)) |
| 305 | / sizeof(struct ext4_extent_idx)); |
Mingming Cao | d2a1763 | 2008-07-14 17:52:37 -0400 | [diff] [blame] | 306 | |
| 307 | /* |
Theodore Ts'o | 9d0be50 | 2010-01-01 02:41:30 -0500 | [diff] [blame] | 308 | * If the new delayed allocation block is contiguous with the |
| 309 | * previous da block, it can share index blocks with the |
| 310 | * previous block, so we only need to allocate a new index |
| 311 | * block every idxs leaf blocks. At ldxs**2 blocks, we need |
| 312 | * an additional index block, and at ldxs**3 blocks, yet |
| 313 | * another index blocks. |
Mingming Cao | d2a1763 | 2008-07-14 17:52:37 -0400 | [diff] [blame] | 314 | */ |
Theodore Ts'o | 9d0be50 | 2010-01-01 02:41:30 -0500 | [diff] [blame] | 315 | if (ei->i_da_metadata_calc_len && |
| 316 | ei->i_da_metadata_calc_last_lblock+1 == lblock) { |
Yongqiang Yang | 81fdbb4 | 2011-10-29 09:23:38 -0400 | [diff] [blame] | 317 | int num = 0; |
| 318 | |
Theodore Ts'o | 9d0be50 | 2010-01-01 02:41:30 -0500 | [diff] [blame] | 319 | if ((ei->i_da_metadata_calc_len % idxs) == 0) |
| 320 | num++; |
| 321 | if ((ei->i_da_metadata_calc_len % (idxs*idxs)) == 0) |
| 322 | num++; |
| 323 | if ((ei->i_da_metadata_calc_len % (idxs*idxs*idxs)) == 0) { |
| 324 | num++; |
| 325 | ei->i_da_metadata_calc_len = 0; |
| 326 | } else |
| 327 | ei->i_da_metadata_calc_len++; |
| 328 | ei->i_da_metadata_calc_last_lblock++; |
| 329 | return num; |
| 330 | } |
Mingming Cao | d2a1763 | 2008-07-14 17:52:37 -0400 | [diff] [blame] | 331 | |
Theodore Ts'o | 9d0be50 | 2010-01-01 02:41:30 -0500 | [diff] [blame] | 332 | /* |
| 333 | * In the worst case we need a new set of index blocks at |
| 334 | * every level of the inode's extent tree. |
| 335 | */ |
| 336 | ei->i_da_metadata_calc_len = 1; |
| 337 | ei->i_da_metadata_calc_last_lblock = lblock; |
| 338 | return ext_depth(inode) + 1; |
Mingming Cao | d2a1763 | 2008-07-14 17:52:37 -0400 | [diff] [blame] | 339 | } |
| 340 | |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 341 | static int |
| 342 | ext4_ext_max_entries(struct inode *inode, int depth) |
| 343 | { |
| 344 | int max; |
| 345 | |
| 346 | if (depth == ext_depth(inode)) { |
| 347 | if (depth == 0) |
Theodore Ts'o | 55ad63b | 2009-08-28 10:40:33 -0400 | [diff] [blame] | 348 | max = ext4_ext_space_root(inode, 1); |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 349 | else |
Theodore Ts'o | 55ad63b | 2009-08-28 10:40:33 -0400 | [diff] [blame] | 350 | max = ext4_ext_space_root_idx(inode, 1); |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 351 | } else { |
| 352 | if (depth == 0) |
Theodore Ts'o | 55ad63b | 2009-08-28 10:40:33 -0400 | [diff] [blame] | 353 | max = ext4_ext_space_block(inode, 1); |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 354 | else |
Theodore Ts'o | 55ad63b | 2009-08-28 10:40:33 -0400 | [diff] [blame] | 355 | max = ext4_ext_space_block_idx(inode, 1); |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 356 | } |
| 357 | |
| 358 | return max; |
| 359 | } |
| 360 | |
Aneesh Kumar K.V | 56b1986 | 2009-03-12 09:51:20 -0400 | [diff] [blame] | 361 | static int ext4_valid_extent(struct inode *inode, struct ext4_extent *ext) |
| 362 | { |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 363 | ext4_fsblk_t block = ext4_ext_pblock(ext); |
Aneesh Kumar K.V | 56b1986 | 2009-03-12 09:51:20 -0400 | [diff] [blame] | 364 | int len = ext4_ext_get_actual_len(ext); |
Eryu Guan | 5946d08 | 2013-12-03 21:22:21 -0500 | [diff] [blame] | 365 | ext4_lblk_t lblock = le32_to_cpu(ext->ee_block); |
| 366 | ext4_lblk_t last = lblock + len - 1; |
Theodore Ts'o | e84a26c | 2009-04-22 20:52:25 -0400 | [diff] [blame] | 367 | |
Eryu Guan | 5946d08 | 2013-12-03 21:22:21 -0500 | [diff] [blame] | 368 | if (lblock > last) |
Theodore Ts'o | 31d4f3a | 2012-03-11 23:30:16 -0400 | [diff] [blame] | 369 | return 0; |
Theodore Ts'o | 6fd058f | 2009-05-17 15:38:01 -0400 | [diff] [blame] | 370 | return ext4_data_block_valid(EXT4_SB(inode->i_sb), block, len); |
Aneesh Kumar K.V | 56b1986 | 2009-03-12 09:51:20 -0400 | [diff] [blame] | 371 | } |
| 372 | |
| 373 | static int ext4_valid_extent_idx(struct inode *inode, |
| 374 | struct ext4_extent_idx *ext_idx) |
| 375 | { |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 376 | ext4_fsblk_t block = ext4_idx_pblock(ext_idx); |
Theodore Ts'o | e84a26c | 2009-04-22 20:52:25 -0400 | [diff] [blame] | 377 | |
Theodore Ts'o | 6fd058f | 2009-05-17 15:38:01 -0400 | [diff] [blame] | 378 | return ext4_data_block_valid(EXT4_SB(inode->i_sb), block, 1); |
Aneesh Kumar K.V | 56b1986 | 2009-03-12 09:51:20 -0400 | [diff] [blame] | 379 | } |
| 380 | |
| 381 | static int ext4_valid_extent_entries(struct inode *inode, |
| 382 | struct ext4_extent_header *eh, |
| 383 | int depth) |
| 384 | { |
Aneesh Kumar K.V | 56b1986 | 2009-03-12 09:51:20 -0400 | [diff] [blame] | 385 | unsigned short entries; |
| 386 | if (eh->eh_entries == 0) |
| 387 | return 1; |
| 388 | |
| 389 | entries = le16_to_cpu(eh->eh_entries); |
| 390 | |
| 391 | if (depth == 0) { |
| 392 | /* leaf entries */ |
Yongqiang Yang | 81fdbb4 | 2011-10-29 09:23:38 -0400 | [diff] [blame] | 393 | struct ext4_extent *ext = EXT_FIRST_EXTENT(eh); |
Eryu Guan | 5946d08 | 2013-12-03 21:22:21 -0500 | [diff] [blame] | 394 | struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es; |
| 395 | ext4_fsblk_t pblock = 0; |
| 396 | ext4_lblk_t lblock = 0; |
| 397 | ext4_lblk_t prev = 0; |
| 398 | int len = 0; |
Aneesh Kumar K.V | 56b1986 | 2009-03-12 09:51:20 -0400 | [diff] [blame] | 399 | while (entries) { |
| 400 | if (!ext4_valid_extent(inode, ext)) |
| 401 | return 0; |
Eryu Guan | 5946d08 | 2013-12-03 21:22:21 -0500 | [diff] [blame] | 402 | |
| 403 | /* Check for overlapping extents */ |
| 404 | lblock = le32_to_cpu(ext->ee_block); |
| 405 | len = ext4_ext_get_actual_len(ext); |
| 406 | if ((lblock <= prev) && prev) { |
| 407 | pblock = ext4_ext_pblock(ext); |
| 408 | es->s_last_error_block = cpu_to_le64(pblock); |
| 409 | return 0; |
| 410 | } |
Aneesh Kumar K.V | 56b1986 | 2009-03-12 09:51:20 -0400 | [diff] [blame] | 411 | ext++; |
| 412 | entries--; |
Eryu Guan | 5946d08 | 2013-12-03 21:22:21 -0500 | [diff] [blame] | 413 | prev = lblock + len - 1; |
Aneesh Kumar K.V | 56b1986 | 2009-03-12 09:51:20 -0400 | [diff] [blame] | 414 | } |
| 415 | } else { |
Yongqiang Yang | 81fdbb4 | 2011-10-29 09:23:38 -0400 | [diff] [blame] | 416 | struct ext4_extent_idx *ext_idx = EXT_FIRST_INDEX(eh); |
Aneesh Kumar K.V | 56b1986 | 2009-03-12 09:51:20 -0400 | [diff] [blame] | 417 | while (entries) { |
| 418 | if (!ext4_valid_extent_idx(inode, ext_idx)) |
| 419 | return 0; |
| 420 | ext_idx++; |
| 421 | entries--; |
| 422 | } |
| 423 | } |
| 424 | return 1; |
| 425 | } |
| 426 | |
Theodore Ts'o | c398eda | 2010-07-27 11:56:40 -0400 | [diff] [blame] | 427 | static int __ext4_ext_check(const char *function, unsigned int line, |
| 428 | struct inode *inode, struct ext4_extent_header *eh, |
Theodore Ts'o | c349179 | 2013-08-16 21:21:41 -0400 | [diff] [blame] | 429 | int depth, ext4_fsblk_t pblk) |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 430 | { |
| 431 | const char *error_msg; |
| 432 | int max = 0; |
| 433 | |
| 434 | if (unlikely(eh->eh_magic != EXT4_EXT_MAGIC)) { |
| 435 | error_msg = "invalid magic"; |
| 436 | goto corrupted; |
| 437 | } |
| 438 | if (unlikely(le16_to_cpu(eh->eh_depth) != depth)) { |
| 439 | error_msg = "unexpected eh_depth"; |
| 440 | goto corrupted; |
| 441 | } |
| 442 | if (unlikely(eh->eh_max == 0)) { |
| 443 | error_msg = "invalid eh_max"; |
| 444 | goto corrupted; |
| 445 | } |
| 446 | max = ext4_ext_max_entries(inode, depth); |
| 447 | if (unlikely(le16_to_cpu(eh->eh_max) > max)) { |
| 448 | error_msg = "too large eh_max"; |
| 449 | goto corrupted; |
| 450 | } |
| 451 | if (unlikely(le16_to_cpu(eh->eh_entries) > le16_to_cpu(eh->eh_max))) { |
| 452 | error_msg = "invalid eh_entries"; |
| 453 | goto corrupted; |
| 454 | } |
Aneesh Kumar K.V | 56b1986 | 2009-03-12 09:51:20 -0400 | [diff] [blame] | 455 | if (!ext4_valid_extent_entries(inode, eh, depth)) { |
| 456 | error_msg = "invalid extent entries"; |
| 457 | goto corrupted; |
| 458 | } |
Darrick J. Wong | 7ac5990 | 2012-04-29 18:37:10 -0400 | [diff] [blame] | 459 | /* Verify checksum on non-root extent tree nodes */ |
| 460 | if (ext_depth(inode) != depth && |
| 461 | !ext4_extent_block_csum_verify(inode, eh)) { |
| 462 | error_msg = "extent tree corrupted"; |
| 463 | goto corrupted; |
| 464 | } |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 465 | return 0; |
| 466 | |
| 467 | corrupted: |
Theodore Ts'o | c398eda | 2010-07-27 11:56:40 -0400 | [diff] [blame] | 468 | ext4_error_inode(inode, function, line, 0, |
Theodore Ts'o | c349179 | 2013-08-16 21:21:41 -0400 | [diff] [blame] | 469 | "pblk %llu bad header/extent: %s - magic %x, " |
| 470 | "entries %u, max %u(%u), depth %u(%u)", |
| 471 | (unsigned long long) pblk, error_msg, |
| 472 | le16_to_cpu(eh->eh_magic), |
| 473 | le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max), |
| 474 | max, le16_to_cpu(eh->eh_depth), depth); |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 475 | return -EIO; |
| 476 | } |
| 477 | |
Theodore Ts'o | c349179 | 2013-08-16 21:21:41 -0400 | [diff] [blame] | 478 | #define ext4_ext_check(inode, eh, depth, pblk) \ |
| 479 | __ext4_ext_check(__func__, __LINE__, (inode), (eh), (depth), (pblk)) |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 480 | |
Aneesh Kumar K.V | 7a262f7 | 2009-03-27 16:39:58 -0400 | [diff] [blame] | 481 | int ext4_ext_check_inode(struct inode *inode) |
| 482 | { |
Theodore Ts'o | c349179 | 2013-08-16 21:21:41 -0400 | [diff] [blame] | 483 | return ext4_ext_check(inode, ext_inode_hdr(inode), ext_depth(inode), 0); |
Aneesh Kumar K.V | 7a262f7 | 2009-03-27 16:39:58 -0400 | [diff] [blame] | 484 | } |
| 485 | |
Theodore Ts'o | 7d7ea89 | 2013-08-16 21:20:41 -0400 | [diff] [blame] | 486 | static struct buffer_head * |
| 487 | __read_extent_tree_block(const char *function, unsigned int line, |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 488 | struct inode *inode, ext4_fsblk_t pblk, int depth, |
| 489 | int flags) |
Darrick J. Wong | f848912 | 2012-04-29 18:21:10 -0400 | [diff] [blame] | 490 | { |
Theodore Ts'o | 7d7ea89 | 2013-08-16 21:20:41 -0400 | [diff] [blame] | 491 | struct buffer_head *bh; |
| 492 | int err; |
Darrick J. Wong | f848912 | 2012-04-29 18:21:10 -0400 | [diff] [blame] | 493 | |
Theodore Ts'o | 7d7ea89 | 2013-08-16 21:20:41 -0400 | [diff] [blame] | 494 | bh = sb_getblk(inode->i_sb, pblk); |
| 495 | if (unlikely(!bh)) |
| 496 | return ERR_PTR(-ENOMEM); |
| 497 | |
| 498 | if (!bh_uptodate_or_lock(bh)) { |
| 499 | trace_ext4_ext_load_extent(inode, pblk, _RET_IP_); |
| 500 | err = bh_submit_read(bh); |
| 501 | if (err < 0) |
| 502 | goto errout; |
| 503 | } |
Theodore Ts'o | 7869a4a | 2013-08-16 22:05:14 -0400 | [diff] [blame] | 504 | if (buffer_verified(bh) && !(flags & EXT4_EX_FORCE_CACHE)) |
Theodore Ts'o | 7d7ea89 | 2013-08-16 21:20:41 -0400 | [diff] [blame] | 505 | return bh; |
| 506 | err = __ext4_ext_check(function, line, inode, |
Theodore Ts'o | c349179 | 2013-08-16 21:21:41 -0400 | [diff] [blame] | 507 | ext_block_hdr(bh), depth, pblk); |
Theodore Ts'o | 7d7ea89 | 2013-08-16 21:20:41 -0400 | [diff] [blame] | 508 | if (err) |
| 509 | goto errout; |
Darrick J. Wong | f848912 | 2012-04-29 18:21:10 -0400 | [diff] [blame] | 510 | set_buffer_verified(bh); |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 511 | /* |
| 512 | * If this is a leaf block, cache all of its entries |
| 513 | */ |
| 514 | if (!(flags & EXT4_EX_NOCACHE) && depth == 0) { |
| 515 | struct ext4_extent_header *eh = ext_block_hdr(bh); |
| 516 | struct ext4_extent *ex = EXT_FIRST_EXTENT(eh); |
| 517 | ext4_lblk_t prev = 0; |
| 518 | int i; |
| 519 | |
| 520 | for (i = le16_to_cpu(eh->eh_entries); i > 0; i--, ex++) { |
| 521 | unsigned int status = EXTENT_STATUS_WRITTEN; |
| 522 | ext4_lblk_t lblk = le32_to_cpu(ex->ee_block); |
| 523 | int len = ext4_ext_get_actual_len(ex); |
| 524 | |
| 525 | if (prev && (prev != lblk)) |
| 526 | ext4_es_cache_extent(inode, prev, |
| 527 | lblk - prev, ~0, |
| 528 | EXTENT_STATUS_HOLE); |
| 529 | |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 530 | if (ext4_ext_is_unwritten(ex)) |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 531 | status = EXTENT_STATUS_UNWRITTEN; |
| 532 | ext4_es_cache_extent(inode, lblk, len, |
| 533 | ext4_ext_pblock(ex), status); |
| 534 | prev = lblk + len; |
| 535 | } |
| 536 | } |
Theodore Ts'o | 7d7ea89 | 2013-08-16 21:20:41 -0400 | [diff] [blame] | 537 | return bh; |
| 538 | errout: |
| 539 | put_bh(bh); |
| 540 | return ERR_PTR(err); |
| 541 | |
Darrick J. Wong | f848912 | 2012-04-29 18:21:10 -0400 | [diff] [blame] | 542 | } |
| 543 | |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 544 | #define read_extent_tree_block(inode, pblk, depth, flags) \ |
| 545 | __read_extent_tree_block(__func__, __LINE__, (inode), (pblk), \ |
| 546 | (depth), (flags)) |
Darrick J. Wong | f848912 | 2012-04-29 18:21:10 -0400 | [diff] [blame] | 547 | |
Theodore Ts'o | 7869a4a | 2013-08-16 22:05:14 -0400 | [diff] [blame] | 548 | /* |
| 549 | * This function is called to cache a file's extent information in the |
| 550 | * extent status tree |
| 551 | */ |
| 552 | int ext4_ext_precache(struct inode *inode) |
| 553 | { |
| 554 | struct ext4_inode_info *ei = EXT4_I(inode); |
| 555 | struct ext4_ext_path *path = NULL; |
| 556 | struct buffer_head *bh; |
| 557 | int i = 0, depth, ret = 0; |
| 558 | |
| 559 | if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) |
| 560 | return 0; /* not an extent-mapped inode */ |
| 561 | |
| 562 | down_read(&ei->i_data_sem); |
| 563 | depth = ext_depth(inode); |
| 564 | |
| 565 | path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 1), |
| 566 | GFP_NOFS); |
| 567 | if (path == NULL) { |
| 568 | up_read(&ei->i_data_sem); |
| 569 | return -ENOMEM; |
| 570 | } |
| 571 | |
| 572 | /* Don't cache anything if there are no external extent blocks */ |
| 573 | if (depth == 0) |
| 574 | goto out; |
| 575 | path[0].p_hdr = ext_inode_hdr(inode); |
| 576 | ret = ext4_ext_check(inode, path[0].p_hdr, depth, 0); |
| 577 | if (ret) |
| 578 | goto out; |
| 579 | path[0].p_idx = EXT_FIRST_INDEX(path[0].p_hdr); |
| 580 | while (i >= 0) { |
| 581 | /* |
| 582 | * If this is a leaf block or we've reached the end of |
| 583 | * the index block, go up |
| 584 | */ |
| 585 | if ((i == depth) || |
| 586 | path[i].p_idx > EXT_LAST_INDEX(path[i].p_hdr)) { |
| 587 | brelse(path[i].p_bh); |
| 588 | path[i].p_bh = NULL; |
| 589 | i--; |
| 590 | continue; |
| 591 | } |
| 592 | bh = read_extent_tree_block(inode, |
| 593 | ext4_idx_pblock(path[i].p_idx++), |
| 594 | depth - i - 1, |
| 595 | EXT4_EX_FORCE_CACHE); |
| 596 | if (IS_ERR(bh)) { |
| 597 | ret = PTR_ERR(bh); |
| 598 | break; |
| 599 | } |
| 600 | i++; |
| 601 | path[i].p_bh = bh; |
| 602 | path[i].p_hdr = ext_block_hdr(bh); |
| 603 | path[i].p_idx = EXT_FIRST_INDEX(path[i].p_hdr); |
| 604 | } |
| 605 | ext4_set_inode_state(inode, EXT4_STATE_EXT_PRECACHED); |
| 606 | out: |
| 607 | up_read(&ei->i_data_sem); |
| 608 | ext4_ext_drop_refs(path); |
| 609 | kfree(path); |
| 610 | return ret; |
| 611 | } |
| 612 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 613 | #ifdef EXT_DEBUG |
| 614 | static void ext4_ext_show_path(struct inode *inode, struct ext4_ext_path *path) |
| 615 | { |
| 616 | int k, l = path->p_depth; |
| 617 | |
| 618 | ext_debug("path:"); |
| 619 | for (k = 0; k <= l; k++, path++) { |
| 620 | if (path->p_idx) { |
Mingming Cao | 2ae0210 | 2006-10-11 01:21:11 -0700 | [diff] [blame] | 621 | ext_debug(" %d->%llu", le32_to_cpu(path->p_idx->ei_block), |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 622 | ext4_idx_pblock(path->p_idx)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 623 | } else if (path->p_ext) { |
Mingming | 553f900 | 2009-09-18 13:34:55 -0400 | [diff] [blame] | 624 | ext_debug(" %d:[%d]%d:%llu ", |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 625 | le32_to_cpu(path->p_ext->ee_block), |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 626 | ext4_ext_is_unwritten(path->p_ext), |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 627 | ext4_ext_get_actual_len(path->p_ext), |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 628 | ext4_ext_pblock(path->p_ext)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 629 | } else |
| 630 | ext_debug(" []"); |
| 631 | } |
| 632 | ext_debug("\n"); |
| 633 | } |
| 634 | |
| 635 | static void ext4_ext_show_leaf(struct inode *inode, struct ext4_ext_path *path) |
| 636 | { |
| 637 | int depth = ext_depth(inode); |
| 638 | struct ext4_extent_header *eh; |
| 639 | struct ext4_extent *ex; |
| 640 | int i; |
| 641 | |
| 642 | if (!path) |
| 643 | return; |
| 644 | |
| 645 | eh = path[depth].p_hdr; |
| 646 | ex = EXT_FIRST_EXTENT(eh); |
| 647 | |
Mingming | 553f900 | 2009-09-18 13:34:55 -0400 | [diff] [blame] | 648 | ext_debug("Displaying leaf extents for inode %lu\n", inode->i_ino); |
| 649 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 650 | for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ex++) { |
Mingming | 553f900 | 2009-09-18 13:34:55 -0400 | [diff] [blame] | 651 | ext_debug("%d:[%d]%d:%llu ", le32_to_cpu(ex->ee_block), |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 652 | ext4_ext_is_unwritten(ex), |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 653 | ext4_ext_get_actual_len(ex), ext4_ext_pblock(ex)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 654 | } |
| 655 | ext_debug("\n"); |
| 656 | } |
Yongqiang Yang | 1b16da7 | 2011-05-25 17:41:48 -0400 | [diff] [blame] | 657 | |
| 658 | static void ext4_ext_show_move(struct inode *inode, struct ext4_ext_path *path, |
| 659 | ext4_fsblk_t newblock, int level) |
| 660 | { |
| 661 | int depth = ext_depth(inode); |
| 662 | struct ext4_extent *ex; |
| 663 | |
| 664 | if (depth != level) { |
| 665 | struct ext4_extent_idx *idx; |
| 666 | idx = path[level].p_idx; |
| 667 | while (idx <= EXT_MAX_INDEX(path[level].p_hdr)) { |
| 668 | ext_debug("%d: move %d:%llu in new index %llu\n", level, |
| 669 | le32_to_cpu(idx->ei_block), |
| 670 | ext4_idx_pblock(idx), |
| 671 | newblock); |
| 672 | idx++; |
| 673 | } |
| 674 | |
| 675 | return; |
| 676 | } |
| 677 | |
| 678 | ex = path[depth].p_ext; |
| 679 | while (ex <= EXT_MAX_EXTENT(path[depth].p_hdr)) { |
| 680 | ext_debug("move %d:%llu:[%d]%d in new leaf %llu\n", |
| 681 | le32_to_cpu(ex->ee_block), |
| 682 | ext4_ext_pblock(ex), |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 683 | ext4_ext_is_unwritten(ex), |
Yongqiang Yang | 1b16da7 | 2011-05-25 17:41:48 -0400 | [diff] [blame] | 684 | ext4_ext_get_actual_len(ex), |
| 685 | newblock); |
| 686 | ex++; |
| 687 | } |
| 688 | } |
| 689 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 690 | #else |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 691 | #define ext4_ext_show_path(inode, path) |
| 692 | #define ext4_ext_show_leaf(inode, path) |
Yongqiang Yang | 1b16da7 | 2011-05-25 17:41:48 -0400 | [diff] [blame] | 693 | #define ext4_ext_show_move(inode, path, newblock, level) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 694 | #endif |
| 695 | |
Aneesh Kumar K.V | b35905c | 2008-02-25 16:54:37 -0500 | [diff] [blame] | 696 | void ext4_ext_drop_refs(struct ext4_ext_path *path) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 697 | { |
| 698 | int depth = path->p_depth; |
| 699 | int i; |
| 700 | |
| 701 | for (i = 0; i <= depth; i++, path++) |
| 702 | if (path->p_bh) { |
| 703 | brelse(path->p_bh); |
| 704 | path->p_bh = NULL; |
| 705 | } |
| 706 | } |
| 707 | |
| 708 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 709 | * ext4_ext_binsearch_idx: |
| 710 | * binary search for the closest index of the given block |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 711 | * the header must be checked before calling this |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 712 | */ |
| 713 | static void |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 714 | ext4_ext_binsearch_idx(struct inode *inode, |
| 715 | struct ext4_ext_path *path, ext4_lblk_t block) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 716 | { |
| 717 | struct ext4_extent_header *eh = path->p_hdr; |
| 718 | struct ext4_extent_idx *r, *l, *m; |
| 719 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 720 | |
Eric Sandeen | bba9074 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 721 | ext_debug("binsearch for %u(idx): ", block); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 722 | |
| 723 | l = EXT_FIRST_INDEX(eh) + 1; |
Dmitry Monakhov | e9f410b | 2007-07-18 09:09:15 -0400 | [diff] [blame] | 724 | r = EXT_LAST_INDEX(eh); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 725 | while (l <= r) { |
| 726 | m = l + (r - l) / 2; |
| 727 | if (block < le32_to_cpu(m->ei_block)) |
| 728 | r = m - 1; |
| 729 | else |
| 730 | l = m + 1; |
Dmitry Monakhov | 26d535e | 2007-07-18 08:33:37 -0400 | [diff] [blame] | 731 | ext_debug("%p(%u):%p(%u):%p(%u) ", l, le32_to_cpu(l->ei_block), |
| 732 | m, le32_to_cpu(m->ei_block), |
| 733 | r, le32_to_cpu(r->ei_block)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 734 | } |
| 735 | |
| 736 | path->p_idx = l - 1; |
Zheng Liu | 4a3c3a5 | 2012-05-28 17:55:16 -0400 | [diff] [blame] | 737 | ext_debug(" -> %u->%lld ", le32_to_cpu(path->p_idx->ei_block), |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 738 | ext4_idx_pblock(path->p_idx)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 739 | |
| 740 | #ifdef CHECK_BINSEARCH |
| 741 | { |
| 742 | struct ext4_extent_idx *chix, *ix; |
| 743 | int k; |
| 744 | |
| 745 | chix = ix = EXT_FIRST_INDEX(eh); |
| 746 | for (k = 0; k < le16_to_cpu(eh->eh_entries); k++, ix++) { |
| 747 | if (k != 0 && |
| 748 | le32_to_cpu(ix->ei_block) <= le32_to_cpu(ix[-1].ei_block)) { |
Theodore Ts'o | 4776004f | 2008-09-08 23:00:52 -0400 | [diff] [blame] | 749 | printk(KERN_DEBUG "k=%d, ix=0x%p, " |
| 750 | "first=0x%p\n", k, |
| 751 | ix, EXT_FIRST_INDEX(eh)); |
| 752 | printk(KERN_DEBUG "%u <= %u\n", |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 753 | le32_to_cpu(ix->ei_block), |
| 754 | le32_to_cpu(ix[-1].ei_block)); |
| 755 | } |
| 756 | BUG_ON(k && le32_to_cpu(ix->ei_block) |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 757 | <= le32_to_cpu(ix[-1].ei_block)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 758 | if (block < le32_to_cpu(ix->ei_block)) |
| 759 | break; |
| 760 | chix = ix; |
| 761 | } |
| 762 | BUG_ON(chix != path->p_idx); |
| 763 | } |
| 764 | #endif |
| 765 | |
| 766 | } |
| 767 | |
| 768 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 769 | * ext4_ext_binsearch: |
| 770 | * binary search for closest extent of the given block |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 771 | * the header must be checked before calling this |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 772 | */ |
| 773 | static void |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 774 | ext4_ext_binsearch(struct inode *inode, |
| 775 | struct ext4_ext_path *path, ext4_lblk_t block) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 776 | { |
| 777 | struct ext4_extent_header *eh = path->p_hdr; |
| 778 | struct ext4_extent *r, *l, *m; |
| 779 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 780 | if (eh->eh_entries == 0) { |
| 781 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 782 | * this leaf is empty: |
| 783 | * we get such a leaf in split/add case |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 784 | */ |
| 785 | return; |
| 786 | } |
| 787 | |
Eric Sandeen | bba9074 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 788 | ext_debug("binsearch for %u: ", block); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 789 | |
| 790 | l = EXT_FIRST_EXTENT(eh) + 1; |
Dmitry Monakhov | e9f410b | 2007-07-18 09:09:15 -0400 | [diff] [blame] | 791 | r = EXT_LAST_EXTENT(eh); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 792 | |
| 793 | while (l <= r) { |
| 794 | m = l + (r - l) / 2; |
| 795 | if (block < le32_to_cpu(m->ee_block)) |
| 796 | r = m - 1; |
| 797 | else |
| 798 | l = m + 1; |
Dmitry Monakhov | 26d535e | 2007-07-18 08:33:37 -0400 | [diff] [blame] | 799 | ext_debug("%p(%u):%p(%u):%p(%u) ", l, le32_to_cpu(l->ee_block), |
| 800 | m, le32_to_cpu(m->ee_block), |
| 801 | r, le32_to_cpu(r->ee_block)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 802 | } |
| 803 | |
| 804 | path->p_ext = l - 1; |
Mingming | 553f900 | 2009-09-18 13:34:55 -0400 | [diff] [blame] | 805 | ext_debug(" -> %d:%llu:[%d]%d ", |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 806 | le32_to_cpu(path->p_ext->ee_block), |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 807 | ext4_ext_pblock(path->p_ext), |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 808 | ext4_ext_is_unwritten(path->p_ext), |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 809 | ext4_ext_get_actual_len(path->p_ext)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 810 | |
| 811 | #ifdef CHECK_BINSEARCH |
| 812 | { |
| 813 | struct ext4_extent *chex, *ex; |
| 814 | int k; |
| 815 | |
| 816 | chex = ex = EXT_FIRST_EXTENT(eh); |
| 817 | for (k = 0; k < le16_to_cpu(eh->eh_entries); k++, ex++) { |
| 818 | BUG_ON(k && le32_to_cpu(ex->ee_block) |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 819 | <= le32_to_cpu(ex[-1].ee_block)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 820 | if (block < le32_to_cpu(ex->ee_block)) |
| 821 | break; |
| 822 | chex = ex; |
| 823 | } |
| 824 | BUG_ON(chex != path->p_ext); |
| 825 | } |
| 826 | #endif |
| 827 | |
| 828 | } |
| 829 | |
| 830 | int ext4_ext_tree_init(handle_t *handle, struct inode *inode) |
| 831 | { |
| 832 | struct ext4_extent_header *eh; |
| 833 | |
| 834 | eh = ext_inode_hdr(inode); |
| 835 | eh->eh_depth = 0; |
| 836 | eh->eh_entries = 0; |
| 837 | eh->eh_magic = EXT4_EXT_MAGIC; |
Theodore Ts'o | 55ad63b | 2009-08-28 10:40:33 -0400 | [diff] [blame] | 838 | eh->eh_max = cpu_to_le16(ext4_ext_space_root(inode, 0)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 839 | ext4_mark_inode_dirty(handle, inode); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 840 | return 0; |
| 841 | } |
| 842 | |
| 843 | struct ext4_ext_path * |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 844 | ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block, |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 845 | struct ext4_ext_path *path, int flags) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 846 | { |
| 847 | struct ext4_extent_header *eh; |
| 848 | struct buffer_head *bh; |
| 849 | short int depth, i, ppos = 0, alloc = 0; |
Theodore Ts'o | 860d21e | 2013-01-12 16:19:36 -0500 | [diff] [blame] | 850 | int ret; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 851 | |
| 852 | eh = ext_inode_hdr(inode); |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 853 | depth = ext_depth(inode); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 854 | |
| 855 | /* account possible depth increase */ |
| 856 | if (!path) { |
Avantika Mathur | 5d4958f | 2006-12-06 20:41:35 -0800 | [diff] [blame] | 857 | path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 2), |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 858 | GFP_NOFS); |
| 859 | if (!path) |
| 860 | return ERR_PTR(-ENOMEM); |
| 861 | alloc = 1; |
| 862 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 863 | path[0].p_hdr = eh; |
Shen Feng | 1973adc | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 864 | path[0].p_bh = NULL; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 865 | |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 866 | i = depth; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 867 | /* walk through the tree */ |
| 868 | while (i) { |
| 869 | ext_debug("depth %d: num %d, max %d\n", |
| 870 | ppos, le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max)); |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 871 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 872 | ext4_ext_binsearch_idx(inode, path + ppos, block); |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 873 | path[ppos].p_block = ext4_idx_pblock(path[ppos].p_idx); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 874 | path[ppos].p_depth = i; |
| 875 | path[ppos].p_ext = NULL; |
| 876 | |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 877 | bh = read_extent_tree_block(inode, path[ppos].p_block, --i, |
| 878 | flags); |
Theodore Ts'o | 7d7ea89 | 2013-08-16 21:20:41 -0400 | [diff] [blame] | 879 | if (IS_ERR(bh)) { |
| 880 | ret = PTR_ERR(bh); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 881 | goto err; |
Theodore Ts'o | 860d21e | 2013-01-12 16:19:36 -0500 | [diff] [blame] | 882 | } |
Theodore Ts'o | 7d7ea89 | 2013-08-16 21:20:41 -0400 | [diff] [blame] | 883 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 884 | eh = ext_block_hdr(bh); |
| 885 | ppos++; |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 886 | if (unlikely(ppos > depth)) { |
| 887 | put_bh(bh); |
| 888 | EXT4_ERROR_INODE(inode, |
| 889 | "ppos %d > depth %d", ppos, depth); |
Theodore Ts'o | 860d21e | 2013-01-12 16:19:36 -0500 | [diff] [blame] | 890 | ret = -EIO; |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 891 | goto err; |
| 892 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 893 | path[ppos].p_bh = bh; |
| 894 | path[ppos].p_hdr = eh; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 895 | } |
| 896 | |
| 897 | path[ppos].p_depth = i; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 898 | path[ppos].p_ext = NULL; |
| 899 | path[ppos].p_idx = NULL; |
| 900 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 901 | /* find extent */ |
| 902 | ext4_ext_binsearch(inode, path + ppos, block); |
Shen Feng | 1973adc | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 903 | /* if not an empty leaf */ |
| 904 | if (path[ppos].p_ext) |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 905 | path[ppos].p_block = ext4_ext_pblock(path[ppos].p_ext); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 906 | |
| 907 | ext4_ext_show_path(inode, path); |
| 908 | |
| 909 | return path; |
| 910 | |
| 911 | err: |
| 912 | ext4_ext_drop_refs(path); |
| 913 | if (alloc) |
| 914 | kfree(path); |
Theodore Ts'o | 860d21e | 2013-01-12 16:19:36 -0500 | [diff] [blame] | 915 | return ERR_PTR(ret); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 916 | } |
| 917 | |
| 918 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 919 | * ext4_ext_insert_index: |
| 920 | * insert new index [@logical;@ptr] into the block at @curp; |
| 921 | * check where to insert: before @curp or after @curp |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 922 | */ |
Theodore Ts'o | 1f109d5 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 923 | static int ext4_ext_insert_index(handle_t *handle, struct inode *inode, |
| 924 | struct ext4_ext_path *curp, |
| 925 | int logical, ext4_fsblk_t ptr) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 926 | { |
| 927 | struct ext4_extent_idx *ix; |
| 928 | int len, err; |
| 929 | |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 930 | err = ext4_ext_get_access(handle, inode, curp); |
| 931 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 932 | return err; |
| 933 | |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 934 | if (unlikely(logical == le32_to_cpu(curp->p_idx->ei_block))) { |
| 935 | EXT4_ERROR_INODE(inode, |
| 936 | "logical %d == ei_block %d!", |
| 937 | logical, le32_to_cpu(curp->p_idx->ei_block)); |
| 938 | return -EIO; |
| 939 | } |
Robin Dong | d462031 | 2011-07-17 23:43:42 -0400 | [diff] [blame] | 940 | |
| 941 | if (unlikely(le16_to_cpu(curp->p_hdr->eh_entries) |
| 942 | >= le16_to_cpu(curp->p_hdr->eh_max))) { |
| 943 | EXT4_ERROR_INODE(inode, |
| 944 | "eh_entries %d >= eh_max %d!", |
| 945 | le16_to_cpu(curp->p_hdr->eh_entries), |
| 946 | le16_to_cpu(curp->p_hdr->eh_max)); |
| 947 | return -EIO; |
| 948 | } |
| 949 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 950 | if (logical > le32_to_cpu(curp->p_idx->ei_block)) { |
| 951 | /* insert after */ |
Eric Gouriou | 80e675f | 2011-10-27 11:52:18 -0400 | [diff] [blame] | 952 | ext_debug("insert new index %d after: %llu\n", logical, ptr); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 953 | ix = curp->p_idx + 1; |
| 954 | } else { |
| 955 | /* insert before */ |
Eric Gouriou | 80e675f | 2011-10-27 11:52:18 -0400 | [diff] [blame] | 956 | ext_debug("insert new index %d before: %llu\n", logical, ptr); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 957 | ix = curp->p_idx; |
| 958 | } |
| 959 | |
Eric Gouriou | 80e675f | 2011-10-27 11:52:18 -0400 | [diff] [blame] | 960 | len = EXT_LAST_INDEX(curp->p_hdr) - ix + 1; |
| 961 | BUG_ON(len < 0); |
| 962 | if (len > 0) { |
| 963 | ext_debug("insert new index %d: " |
| 964 | "move %d indices from 0x%p to 0x%p\n", |
| 965 | logical, len, ix, ix + 1); |
| 966 | memmove(ix + 1, ix, len * sizeof(struct ext4_extent_idx)); |
| 967 | } |
| 968 | |
Tao Ma | f472e02 | 2011-10-17 10:13:46 -0400 | [diff] [blame] | 969 | if (unlikely(ix > EXT_MAX_INDEX(curp->p_hdr))) { |
| 970 | EXT4_ERROR_INODE(inode, "ix > EXT_MAX_INDEX!"); |
| 971 | return -EIO; |
| 972 | } |
| 973 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 974 | ix->ei_block = cpu_to_le32(logical); |
Alex Tomas | f65e6fb | 2006-10-11 01:21:05 -0700 | [diff] [blame] | 975 | ext4_idx_store_pblock(ix, ptr); |
Marcin Slusarz | e8546d0 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 976 | le16_add_cpu(&curp->p_hdr->eh_entries, 1); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 977 | |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 978 | if (unlikely(ix > EXT_LAST_INDEX(curp->p_hdr))) { |
| 979 | EXT4_ERROR_INODE(inode, "ix > EXT_LAST_INDEX!"); |
| 980 | return -EIO; |
| 981 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 982 | |
| 983 | err = ext4_ext_dirty(handle, inode, curp); |
| 984 | ext4_std_error(inode->i_sb, err); |
| 985 | |
| 986 | return err; |
| 987 | } |
| 988 | |
| 989 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 990 | * ext4_ext_split: |
| 991 | * inserts new subtree into the path, using free index entry |
| 992 | * at depth @at: |
| 993 | * - allocates all needed blocks (new leaf and all intermediate index blocks) |
| 994 | * - makes decision where to split |
| 995 | * - moves remaining extents and index entries (right to the split point) |
| 996 | * into the newly allocated blocks |
| 997 | * - initializes subtree |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 998 | */ |
| 999 | static int ext4_ext_split(handle_t *handle, struct inode *inode, |
Allison Henderson | 55f020d | 2011-05-25 07:41:26 -0400 | [diff] [blame] | 1000 | unsigned int flags, |
| 1001 | struct ext4_ext_path *path, |
| 1002 | struct ext4_extent *newext, int at) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1003 | { |
| 1004 | struct buffer_head *bh = NULL; |
| 1005 | int depth = ext_depth(inode); |
| 1006 | struct ext4_extent_header *neh; |
| 1007 | struct ext4_extent_idx *fidx; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1008 | int i = at, k, m, a; |
Alex Tomas | f65e6fb | 2006-10-11 01:21:05 -0700 | [diff] [blame] | 1009 | ext4_fsblk_t newblock, oldblock; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1010 | __le32 border; |
Alex Tomas | f65e6fb | 2006-10-11 01:21:05 -0700 | [diff] [blame] | 1011 | ext4_fsblk_t *ablocks = NULL; /* array of allocated blocks */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1012 | int err = 0; |
| 1013 | |
| 1014 | /* make decision: where to split? */ |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1015 | /* FIXME: now decision is simplest: at current extent */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1016 | |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1017 | /* if current leaf will be split, then we should use |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1018 | * border from split point */ |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1019 | if (unlikely(path[depth].p_ext > EXT_MAX_EXTENT(path[depth].p_hdr))) { |
| 1020 | EXT4_ERROR_INODE(inode, "p_ext > EXT_MAX_EXTENT!"); |
| 1021 | return -EIO; |
| 1022 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1023 | if (path[depth].p_ext != EXT_MAX_EXTENT(path[depth].p_hdr)) { |
| 1024 | border = path[depth].p_ext[1].ee_block; |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1025 | ext_debug("leaf will be split." |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1026 | " next leaf starts at %d\n", |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 1027 | le32_to_cpu(border)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1028 | } else { |
| 1029 | border = newext->ee_block; |
| 1030 | ext_debug("leaf will be added." |
| 1031 | " next leaf starts at %d\n", |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 1032 | le32_to_cpu(border)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1033 | } |
| 1034 | |
| 1035 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1036 | * If error occurs, then we break processing |
| 1037 | * and mark filesystem read-only. index won't |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1038 | * be inserted and tree will be in consistent |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1039 | * state. Next mount will repair buffers too. |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1040 | */ |
| 1041 | |
| 1042 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1043 | * Get array to track all allocated blocks. |
| 1044 | * We need this to handle errors and free blocks |
| 1045 | * upon them. |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1046 | */ |
Avantika Mathur | 5d4958f | 2006-12-06 20:41:35 -0800 | [diff] [blame] | 1047 | ablocks = kzalloc(sizeof(ext4_fsblk_t) * depth, GFP_NOFS); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1048 | if (!ablocks) |
| 1049 | return -ENOMEM; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1050 | |
| 1051 | /* allocate all needed blocks */ |
| 1052 | ext_debug("allocate %d blocks for indexes/leaf\n", depth - at); |
| 1053 | for (a = 0; a < depth - at; a++) { |
Aneesh Kumar K.V | 654b490 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 1054 | newblock = ext4_ext_new_meta_block(handle, inode, path, |
Allison Henderson | 55f020d | 2011-05-25 07:41:26 -0400 | [diff] [blame] | 1055 | newext, &err, flags); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1056 | if (newblock == 0) |
| 1057 | goto cleanup; |
| 1058 | ablocks[a] = newblock; |
| 1059 | } |
| 1060 | |
| 1061 | /* initialize new leaf */ |
| 1062 | newblock = ablocks[--a]; |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1063 | if (unlikely(newblock == 0)) { |
| 1064 | EXT4_ERROR_INODE(inode, "newblock == 0!"); |
| 1065 | err = -EIO; |
| 1066 | goto cleanup; |
| 1067 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1068 | bh = sb_getblk(inode->i_sb, newblock); |
Wang Shilong | aebf024 | 2013-01-12 16:28:47 -0500 | [diff] [blame] | 1069 | if (unlikely(!bh)) { |
Theodore Ts'o | 860d21e | 2013-01-12 16:19:36 -0500 | [diff] [blame] | 1070 | err = -ENOMEM; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1071 | goto cleanup; |
| 1072 | } |
| 1073 | lock_buffer(bh); |
| 1074 | |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 1075 | err = ext4_journal_get_create_access(handle, bh); |
| 1076 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1077 | goto cleanup; |
| 1078 | |
| 1079 | neh = ext_block_hdr(bh); |
| 1080 | neh->eh_entries = 0; |
Theodore Ts'o | 55ad63b | 2009-08-28 10:40:33 -0400 | [diff] [blame] | 1081 | neh->eh_max = cpu_to_le16(ext4_ext_space_block(inode, 0)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1082 | neh->eh_magic = EXT4_EXT_MAGIC; |
| 1083 | neh->eh_depth = 0; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1084 | |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1085 | /* move remainder of path[depth] to the new leaf */ |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1086 | if (unlikely(path[depth].p_hdr->eh_entries != |
| 1087 | path[depth].p_hdr->eh_max)) { |
| 1088 | EXT4_ERROR_INODE(inode, "eh_entries %d != eh_max %d!", |
| 1089 | path[depth].p_hdr->eh_entries, |
| 1090 | path[depth].p_hdr->eh_max); |
| 1091 | err = -EIO; |
| 1092 | goto cleanup; |
| 1093 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1094 | /* start copy from next extent */ |
Yongqiang Yang | 1b16da7 | 2011-05-25 17:41:48 -0400 | [diff] [blame] | 1095 | m = EXT_MAX_EXTENT(path[depth].p_hdr) - path[depth].p_ext++; |
| 1096 | ext4_ext_show_move(inode, path, newblock, depth); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1097 | if (m) { |
Yongqiang Yang | 1b16da7 | 2011-05-25 17:41:48 -0400 | [diff] [blame] | 1098 | struct ext4_extent *ex; |
| 1099 | ex = EXT_FIRST_EXTENT(neh); |
| 1100 | memmove(ex, path[depth].p_ext, sizeof(struct ext4_extent) * m); |
Marcin Slusarz | e8546d0 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 1101 | le16_add_cpu(&neh->eh_entries, m); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1102 | } |
| 1103 | |
Darrick J. Wong | 7ac5990 | 2012-04-29 18:37:10 -0400 | [diff] [blame] | 1104 | ext4_extent_block_csum_set(inode, neh); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1105 | set_buffer_uptodate(bh); |
| 1106 | unlock_buffer(bh); |
| 1107 | |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 1108 | err = ext4_handle_dirty_metadata(handle, inode, bh); |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 1109 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1110 | goto cleanup; |
| 1111 | brelse(bh); |
| 1112 | bh = NULL; |
| 1113 | |
| 1114 | /* correct old leaf */ |
| 1115 | if (m) { |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 1116 | err = ext4_ext_get_access(handle, inode, path + depth); |
| 1117 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1118 | goto cleanup; |
Marcin Slusarz | e8546d0 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 1119 | le16_add_cpu(&path[depth].p_hdr->eh_entries, -m); |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 1120 | err = ext4_ext_dirty(handle, inode, path + depth); |
| 1121 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1122 | goto cleanup; |
| 1123 | |
| 1124 | } |
| 1125 | |
| 1126 | /* create intermediate indexes */ |
| 1127 | k = depth - at - 1; |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1128 | if (unlikely(k < 0)) { |
| 1129 | EXT4_ERROR_INODE(inode, "k %d < 0!", k); |
| 1130 | err = -EIO; |
| 1131 | goto cleanup; |
| 1132 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1133 | if (k) |
| 1134 | ext_debug("create %d intermediate indices\n", k); |
| 1135 | /* insert new index into current index block */ |
| 1136 | /* current depth stored in i var */ |
| 1137 | i = depth - 1; |
| 1138 | while (k--) { |
| 1139 | oldblock = newblock; |
| 1140 | newblock = ablocks[--a]; |
Eric Sandeen | bba9074 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1141 | bh = sb_getblk(inode->i_sb, newblock); |
Wang Shilong | aebf024 | 2013-01-12 16:28:47 -0500 | [diff] [blame] | 1142 | if (unlikely(!bh)) { |
Theodore Ts'o | 860d21e | 2013-01-12 16:19:36 -0500 | [diff] [blame] | 1143 | err = -ENOMEM; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1144 | goto cleanup; |
| 1145 | } |
| 1146 | lock_buffer(bh); |
| 1147 | |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 1148 | err = ext4_journal_get_create_access(handle, bh); |
| 1149 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1150 | goto cleanup; |
| 1151 | |
| 1152 | neh = ext_block_hdr(bh); |
| 1153 | neh->eh_entries = cpu_to_le16(1); |
| 1154 | neh->eh_magic = EXT4_EXT_MAGIC; |
Theodore Ts'o | 55ad63b | 2009-08-28 10:40:33 -0400 | [diff] [blame] | 1155 | neh->eh_max = cpu_to_le16(ext4_ext_space_block_idx(inode, 0)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1156 | neh->eh_depth = cpu_to_le16(depth - i); |
| 1157 | fidx = EXT_FIRST_INDEX(neh); |
| 1158 | fidx->ei_block = border; |
Alex Tomas | f65e6fb | 2006-10-11 01:21:05 -0700 | [diff] [blame] | 1159 | ext4_idx_store_pblock(fidx, oldblock); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1160 | |
Eric Sandeen | bba9074 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1161 | ext_debug("int.index at %d (block %llu): %u -> %llu\n", |
| 1162 | i, newblock, le32_to_cpu(border), oldblock); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1163 | |
Yongqiang Yang | 1b16da7 | 2011-05-25 17:41:48 -0400 | [diff] [blame] | 1164 | /* move remainder of path[i] to the new index block */ |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1165 | if (unlikely(EXT_MAX_INDEX(path[i].p_hdr) != |
| 1166 | EXT_LAST_INDEX(path[i].p_hdr))) { |
| 1167 | EXT4_ERROR_INODE(inode, |
| 1168 | "EXT_MAX_INDEX != EXT_LAST_INDEX ee_block %d!", |
| 1169 | le32_to_cpu(path[i].p_ext->ee_block)); |
| 1170 | err = -EIO; |
| 1171 | goto cleanup; |
| 1172 | } |
Yongqiang Yang | 1b16da7 | 2011-05-25 17:41:48 -0400 | [diff] [blame] | 1173 | /* start copy indexes */ |
| 1174 | m = EXT_MAX_INDEX(path[i].p_hdr) - path[i].p_idx++; |
| 1175 | ext_debug("cur 0x%p, last 0x%p\n", path[i].p_idx, |
| 1176 | EXT_MAX_INDEX(path[i].p_hdr)); |
| 1177 | ext4_ext_show_move(inode, path, newblock, i); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1178 | if (m) { |
Yongqiang Yang | 1b16da7 | 2011-05-25 17:41:48 -0400 | [diff] [blame] | 1179 | memmove(++fidx, path[i].p_idx, |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1180 | sizeof(struct ext4_extent_idx) * m); |
Marcin Slusarz | e8546d0 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 1181 | le16_add_cpu(&neh->eh_entries, m); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1182 | } |
Darrick J. Wong | 7ac5990 | 2012-04-29 18:37:10 -0400 | [diff] [blame] | 1183 | ext4_extent_block_csum_set(inode, neh); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1184 | set_buffer_uptodate(bh); |
| 1185 | unlock_buffer(bh); |
| 1186 | |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 1187 | err = ext4_handle_dirty_metadata(handle, inode, bh); |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 1188 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1189 | goto cleanup; |
| 1190 | brelse(bh); |
| 1191 | bh = NULL; |
| 1192 | |
| 1193 | /* correct old index */ |
| 1194 | if (m) { |
| 1195 | err = ext4_ext_get_access(handle, inode, path + i); |
| 1196 | if (err) |
| 1197 | goto cleanup; |
Marcin Slusarz | e8546d0 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 1198 | le16_add_cpu(&path[i].p_hdr->eh_entries, -m); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1199 | err = ext4_ext_dirty(handle, inode, path + i); |
| 1200 | if (err) |
| 1201 | goto cleanup; |
| 1202 | } |
| 1203 | |
| 1204 | i--; |
| 1205 | } |
| 1206 | |
| 1207 | /* insert new index */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1208 | err = ext4_ext_insert_index(handle, inode, path + at, |
| 1209 | le32_to_cpu(border), newblock); |
| 1210 | |
| 1211 | cleanup: |
| 1212 | if (bh) { |
| 1213 | if (buffer_locked(bh)) |
| 1214 | unlock_buffer(bh); |
| 1215 | brelse(bh); |
| 1216 | } |
| 1217 | |
| 1218 | if (err) { |
| 1219 | /* free all allocated blocks in error case */ |
| 1220 | for (i = 0; i < depth; i++) { |
| 1221 | if (!ablocks[i]) |
| 1222 | continue; |
Peter Huewe | 7dc5761 | 2011-02-21 21:01:42 -0500 | [diff] [blame] | 1223 | ext4_free_blocks(handle, inode, NULL, ablocks[i], 1, |
Theodore Ts'o | e636260 | 2009-11-23 07:17:05 -0500 | [diff] [blame] | 1224 | EXT4_FREE_BLOCKS_METADATA); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1225 | } |
| 1226 | } |
| 1227 | kfree(ablocks); |
| 1228 | |
| 1229 | return err; |
| 1230 | } |
| 1231 | |
| 1232 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1233 | * ext4_ext_grow_indepth: |
| 1234 | * implements tree growing procedure: |
| 1235 | * - allocates new block |
| 1236 | * - moves top-level data (index block or leaf) into the new block |
| 1237 | * - initializes new top-level, creating index that points to the |
| 1238 | * just created block |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1239 | */ |
| 1240 | static int ext4_ext_grow_indepth(handle_t *handle, struct inode *inode, |
Allison Henderson | 55f020d | 2011-05-25 07:41:26 -0400 | [diff] [blame] | 1241 | unsigned int flags, |
Allison Henderson | 55f020d | 2011-05-25 07:41:26 -0400 | [diff] [blame] | 1242 | struct ext4_extent *newext) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1243 | { |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1244 | struct ext4_extent_header *neh; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1245 | struct buffer_head *bh; |
Alex Tomas | f65e6fb | 2006-10-11 01:21:05 -0700 | [diff] [blame] | 1246 | ext4_fsblk_t newblock; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1247 | int err = 0; |
| 1248 | |
Dmitry Monakhov | 1939dd8 | 2011-10-22 01:26:05 -0400 | [diff] [blame] | 1249 | newblock = ext4_ext_new_meta_block(handle, inode, NULL, |
Allison Henderson | 55f020d | 2011-05-25 07:41:26 -0400 | [diff] [blame] | 1250 | newext, &err, flags); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1251 | if (newblock == 0) |
| 1252 | return err; |
| 1253 | |
| 1254 | bh = sb_getblk(inode->i_sb, newblock); |
Wang Shilong | aebf024 | 2013-01-12 16:28:47 -0500 | [diff] [blame] | 1255 | if (unlikely(!bh)) |
Theodore Ts'o | 860d21e | 2013-01-12 16:19:36 -0500 | [diff] [blame] | 1256 | return -ENOMEM; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1257 | lock_buffer(bh); |
| 1258 | |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 1259 | err = ext4_journal_get_create_access(handle, bh); |
| 1260 | if (err) { |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1261 | unlock_buffer(bh); |
| 1262 | goto out; |
| 1263 | } |
| 1264 | |
| 1265 | /* move top-level index/leaf into new block */ |
Dmitry Monakhov | 1939dd8 | 2011-10-22 01:26:05 -0400 | [diff] [blame] | 1266 | memmove(bh->b_data, EXT4_I(inode)->i_data, |
| 1267 | sizeof(EXT4_I(inode)->i_data)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1268 | |
| 1269 | /* set size of new block */ |
| 1270 | neh = ext_block_hdr(bh); |
| 1271 | /* old root could have indexes or leaves |
| 1272 | * so calculate e_max right way */ |
| 1273 | if (ext_depth(inode)) |
Theodore Ts'o | 55ad63b | 2009-08-28 10:40:33 -0400 | [diff] [blame] | 1274 | neh->eh_max = cpu_to_le16(ext4_ext_space_block_idx(inode, 0)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1275 | else |
Theodore Ts'o | 55ad63b | 2009-08-28 10:40:33 -0400 | [diff] [blame] | 1276 | neh->eh_max = cpu_to_le16(ext4_ext_space_block(inode, 0)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1277 | neh->eh_magic = EXT4_EXT_MAGIC; |
Darrick J. Wong | 7ac5990 | 2012-04-29 18:37:10 -0400 | [diff] [blame] | 1278 | ext4_extent_block_csum_set(inode, neh); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1279 | set_buffer_uptodate(bh); |
| 1280 | unlock_buffer(bh); |
| 1281 | |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 1282 | err = ext4_handle_dirty_metadata(handle, inode, bh); |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 1283 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1284 | goto out; |
| 1285 | |
Dmitry Monakhov | 1939dd8 | 2011-10-22 01:26:05 -0400 | [diff] [blame] | 1286 | /* Update top-level index: num,max,pointer */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1287 | neh = ext_inode_hdr(inode); |
Dmitry Monakhov | 1939dd8 | 2011-10-22 01:26:05 -0400 | [diff] [blame] | 1288 | neh->eh_entries = cpu_to_le16(1); |
| 1289 | ext4_idx_store_pblock(EXT_FIRST_INDEX(neh), newblock); |
| 1290 | if (neh->eh_depth == 0) { |
| 1291 | /* Root extent block becomes index block */ |
| 1292 | neh->eh_max = cpu_to_le16(ext4_ext_space_root_idx(inode, 0)); |
| 1293 | EXT_FIRST_INDEX(neh)->ei_block = |
| 1294 | EXT_FIRST_EXTENT(neh)->ee_block; |
| 1295 | } |
Mingming Cao | 2ae0210 | 2006-10-11 01:21:11 -0700 | [diff] [blame] | 1296 | ext_debug("new root: num %d(%d), lblock %d, ptr %llu\n", |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1297 | le16_to_cpu(neh->eh_entries), le16_to_cpu(neh->eh_max), |
Andi Kleen | 5a0790c | 2010-06-14 13:28:03 -0400 | [diff] [blame] | 1298 | le32_to_cpu(EXT_FIRST_INDEX(neh)->ei_block), |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 1299 | ext4_idx_pblock(EXT_FIRST_INDEX(neh))); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1300 | |
Wei Yongjun | ba39ebb | 2012-09-27 09:37:53 -0400 | [diff] [blame] | 1301 | le16_add_cpu(&neh->eh_depth, 1); |
Dmitry Monakhov | 1939dd8 | 2011-10-22 01:26:05 -0400 | [diff] [blame] | 1302 | ext4_mark_inode_dirty(handle, inode); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1303 | out: |
| 1304 | brelse(bh); |
| 1305 | |
| 1306 | return err; |
| 1307 | } |
| 1308 | |
| 1309 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1310 | * ext4_ext_create_new_leaf: |
| 1311 | * finds empty index and adds new leaf. |
| 1312 | * if no free index is found, then it requests in-depth growing. |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1313 | */ |
| 1314 | static int ext4_ext_create_new_leaf(handle_t *handle, struct inode *inode, |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 1315 | unsigned int mb_flags, |
| 1316 | unsigned int gb_flags, |
Allison Henderson | 55f020d | 2011-05-25 07:41:26 -0400 | [diff] [blame] | 1317 | struct ext4_ext_path *path, |
| 1318 | struct ext4_extent *newext) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1319 | { |
| 1320 | struct ext4_ext_path *curp; |
| 1321 | int depth, i, err = 0; |
| 1322 | |
| 1323 | repeat: |
| 1324 | i = depth = ext_depth(inode); |
| 1325 | |
| 1326 | /* walk up to the tree and look for free index entry */ |
| 1327 | curp = path + depth; |
| 1328 | while (i > 0 && !EXT_HAS_FREE_INDEX(curp)) { |
| 1329 | i--; |
| 1330 | curp--; |
| 1331 | } |
| 1332 | |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1333 | /* we use already allocated block for index block, |
| 1334 | * so subsequent data blocks should be contiguous */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1335 | if (EXT_HAS_FREE_INDEX(curp)) { |
| 1336 | /* if we found index with free entry, then use that |
| 1337 | * entry: create all needed subtree and add new leaf */ |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 1338 | err = ext4_ext_split(handle, inode, mb_flags, path, newext, i); |
Shen Feng | 787e098 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 1339 | if (err) |
| 1340 | goto out; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1341 | |
| 1342 | /* refill path */ |
| 1343 | ext4_ext_drop_refs(path); |
| 1344 | path = ext4_ext_find_extent(inode, |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1345 | (ext4_lblk_t)le32_to_cpu(newext->ee_block), |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 1346 | path, gb_flags); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1347 | if (IS_ERR(path)) |
| 1348 | err = PTR_ERR(path); |
| 1349 | } else { |
| 1350 | /* tree is full, time to grow in depth */ |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 1351 | err = ext4_ext_grow_indepth(handle, inode, mb_flags, newext); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1352 | if (err) |
| 1353 | goto out; |
| 1354 | |
| 1355 | /* refill path */ |
| 1356 | ext4_ext_drop_refs(path); |
| 1357 | path = ext4_ext_find_extent(inode, |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1358 | (ext4_lblk_t)le32_to_cpu(newext->ee_block), |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 1359 | path, gb_flags); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1360 | if (IS_ERR(path)) { |
| 1361 | err = PTR_ERR(path); |
| 1362 | goto out; |
| 1363 | } |
| 1364 | |
| 1365 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1366 | * only first (depth 0 -> 1) produces free space; |
| 1367 | * in all other cases we have to split the grown tree |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1368 | */ |
| 1369 | depth = ext_depth(inode); |
| 1370 | if (path[depth].p_hdr->eh_entries == path[depth].p_hdr->eh_max) { |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1371 | /* now we need to split */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1372 | goto repeat; |
| 1373 | } |
| 1374 | } |
| 1375 | |
| 1376 | out: |
| 1377 | return err; |
| 1378 | } |
| 1379 | |
| 1380 | /* |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1381 | * search the closest allocated block to the left for *logical |
| 1382 | * and returns it at @logical + it's physical address at @phys |
| 1383 | * if *logical is the smallest allocated block, the function |
| 1384 | * returns 0 at @phys |
| 1385 | * return value contains 0 (success) or error code |
| 1386 | */ |
Theodore Ts'o | 1f109d5 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 1387 | static int ext4_ext_search_left(struct inode *inode, |
| 1388 | struct ext4_ext_path *path, |
| 1389 | ext4_lblk_t *logical, ext4_fsblk_t *phys) |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1390 | { |
| 1391 | struct ext4_extent_idx *ix; |
| 1392 | struct ext4_extent *ex; |
Aneesh Kumar K.V | b939e37 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1393 | int depth, ee_len; |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1394 | |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1395 | if (unlikely(path == NULL)) { |
| 1396 | EXT4_ERROR_INODE(inode, "path == NULL *logical %d!", *logical); |
| 1397 | return -EIO; |
| 1398 | } |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1399 | depth = path->p_depth; |
| 1400 | *phys = 0; |
| 1401 | |
| 1402 | if (depth == 0 && path->p_ext == NULL) |
| 1403 | return 0; |
| 1404 | |
| 1405 | /* usually extent in the path covers blocks smaller |
| 1406 | * then *logical, but it can be that extent is the |
| 1407 | * first one in the file */ |
| 1408 | |
| 1409 | ex = path[depth].p_ext; |
Aneesh Kumar K.V | b939e37 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1410 | ee_len = ext4_ext_get_actual_len(ex); |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1411 | if (*logical < le32_to_cpu(ex->ee_block)) { |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1412 | if (unlikely(EXT_FIRST_EXTENT(path[depth].p_hdr) != ex)) { |
| 1413 | EXT4_ERROR_INODE(inode, |
| 1414 | "EXT_FIRST_EXTENT != ex *logical %d ee_block %d!", |
| 1415 | *logical, le32_to_cpu(ex->ee_block)); |
| 1416 | return -EIO; |
| 1417 | } |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1418 | while (--depth >= 0) { |
| 1419 | ix = path[depth].p_idx; |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1420 | if (unlikely(ix != EXT_FIRST_INDEX(path[depth].p_hdr))) { |
| 1421 | EXT4_ERROR_INODE(inode, |
| 1422 | "ix (%d) != EXT_FIRST_INDEX (%d) (depth %d)!", |
Tao Ma | 6ee3b21 | 2011-10-08 16:08:34 -0400 | [diff] [blame] | 1423 | ix != NULL ? le32_to_cpu(ix->ei_block) : 0, |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1424 | EXT_FIRST_INDEX(path[depth].p_hdr) != NULL ? |
Tao Ma | 6ee3b21 | 2011-10-08 16:08:34 -0400 | [diff] [blame] | 1425 | le32_to_cpu(EXT_FIRST_INDEX(path[depth].p_hdr)->ei_block) : 0, |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1426 | depth); |
| 1427 | return -EIO; |
| 1428 | } |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1429 | } |
| 1430 | return 0; |
| 1431 | } |
| 1432 | |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1433 | if (unlikely(*logical < (le32_to_cpu(ex->ee_block) + ee_len))) { |
| 1434 | EXT4_ERROR_INODE(inode, |
| 1435 | "logical %d < ee_block %d + ee_len %d!", |
| 1436 | *logical, le32_to_cpu(ex->ee_block), ee_len); |
| 1437 | return -EIO; |
| 1438 | } |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1439 | |
Aneesh Kumar K.V | b939e37 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1440 | *logical = le32_to_cpu(ex->ee_block) + ee_len - 1; |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 1441 | *phys = ext4_ext_pblock(ex) + ee_len - 1; |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1442 | return 0; |
| 1443 | } |
| 1444 | |
| 1445 | /* |
| 1446 | * search the closest allocated block to the right for *logical |
| 1447 | * and returns it at @logical + it's physical address at @phys |
Tao Ma | df3ab17 | 2011-10-08 15:53:49 -0400 | [diff] [blame] | 1448 | * if *logical is the largest allocated block, the function |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1449 | * returns 0 at @phys |
| 1450 | * return value contains 0 (success) or error code |
| 1451 | */ |
Theodore Ts'o | 1f109d5 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 1452 | static int ext4_ext_search_right(struct inode *inode, |
| 1453 | struct ext4_ext_path *path, |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 1454 | ext4_lblk_t *logical, ext4_fsblk_t *phys, |
| 1455 | struct ext4_extent **ret_ex) |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1456 | { |
| 1457 | struct buffer_head *bh = NULL; |
| 1458 | struct ext4_extent_header *eh; |
| 1459 | struct ext4_extent_idx *ix; |
| 1460 | struct ext4_extent *ex; |
| 1461 | ext4_fsblk_t block; |
Eric Sandeen | 395a87b | 2009-03-10 18:18:47 -0400 | [diff] [blame] | 1462 | int depth; /* Note, NOT eh_depth; depth from top of tree */ |
| 1463 | int ee_len; |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1464 | |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1465 | if (unlikely(path == NULL)) { |
| 1466 | EXT4_ERROR_INODE(inode, "path == NULL *logical %d!", *logical); |
| 1467 | return -EIO; |
| 1468 | } |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1469 | depth = path->p_depth; |
| 1470 | *phys = 0; |
| 1471 | |
| 1472 | if (depth == 0 && path->p_ext == NULL) |
| 1473 | return 0; |
| 1474 | |
| 1475 | /* usually extent in the path covers blocks smaller |
| 1476 | * then *logical, but it can be that extent is the |
| 1477 | * first one in the file */ |
| 1478 | |
| 1479 | ex = path[depth].p_ext; |
Aneesh Kumar K.V | b939e37 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1480 | ee_len = ext4_ext_get_actual_len(ex); |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1481 | if (*logical < le32_to_cpu(ex->ee_block)) { |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1482 | if (unlikely(EXT_FIRST_EXTENT(path[depth].p_hdr) != ex)) { |
| 1483 | EXT4_ERROR_INODE(inode, |
| 1484 | "first_extent(path[%d].p_hdr) != ex", |
| 1485 | depth); |
| 1486 | return -EIO; |
| 1487 | } |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1488 | while (--depth >= 0) { |
| 1489 | ix = path[depth].p_idx; |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1490 | if (unlikely(ix != EXT_FIRST_INDEX(path[depth].p_hdr))) { |
| 1491 | EXT4_ERROR_INODE(inode, |
| 1492 | "ix != EXT_FIRST_INDEX *logical %d!", |
| 1493 | *logical); |
| 1494 | return -EIO; |
| 1495 | } |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1496 | } |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 1497 | goto found_extent; |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1498 | } |
| 1499 | |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1500 | if (unlikely(*logical < (le32_to_cpu(ex->ee_block) + ee_len))) { |
| 1501 | EXT4_ERROR_INODE(inode, |
| 1502 | "logical %d < ee_block %d + ee_len %d!", |
| 1503 | *logical, le32_to_cpu(ex->ee_block), ee_len); |
| 1504 | return -EIO; |
| 1505 | } |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1506 | |
| 1507 | if (ex != EXT_LAST_EXTENT(path[depth].p_hdr)) { |
| 1508 | /* next allocated block in this leaf */ |
| 1509 | ex++; |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 1510 | goto found_extent; |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1511 | } |
| 1512 | |
| 1513 | /* go up and search for index to the right */ |
| 1514 | while (--depth >= 0) { |
| 1515 | ix = path[depth].p_idx; |
| 1516 | if (ix != EXT_LAST_INDEX(path[depth].p_hdr)) |
Wu Fengguang | 25f1ee3 | 2008-11-25 17:24:23 -0500 | [diff] [blame] | 1517 | goto got_index; |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1518 | } |
| 1519 | |
Wu Fengguang | 25f1ee3 | 2008-11-25 17:24:23 -0500 | [diff] [blame] | 1520 | /* we've gone up to the root and found no index to the right */ |
| 1521 | return 0; |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1522 | |
Wu Fengguang | 25f1ee3 | 2008-11-25 17:24:23 -0500 | [diff] [blame] | 1523 | got_index: |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1524 | /* we've found index to the right, let's |
| 1525 | * follow it and find the closest allocated |
| 1526 | * block to the right */ |
| 1527 | ix++; |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 1528 | block = ext4_idx_pblock(ix); |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1529 | while (++depth < path->p_depth) { |
Eric Sandeen | 395a87b | 2009-03-10 18:18:47 -0400 | [diff] [blame] | 1530 | /* subtract from p_depth to get proper eh_depth */ |
Theodore Ts'o | 7d7ea89 | 2013-08-16 21:20:41 -0400 | [diff] [blame] | 1531 | bh = read_extent_tree_block(inode, block, |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 1532 | path->p_depth - depth, 0); |
Theodore Ts'o | 7d7ea89 | 2013-08-16 21:20:41 -0400 | [diff] [blame] | 1533 | if (IS_ERR(bh)) |
| 1534 | return PTR_ERR(bh); |
| 1535 | eh = ext_block_hdr(bh); |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1536 | ix = EXT_FIRST_INDEX(eh); |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 1537 | block = ext4_idx_pblock(ix); |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1538 | put_bh(bh); |
| 1539 | } |
| 1540 | |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 1541 | bh = read_extent_tree_block(inode, block, path->p_depth - depth, 0); |
Theodore Ts'o | 7d7ea89 | 2013-08-16 21:20:41 -0400 | [diff] [blame] | 1542 | if (IS_ERR(bh)) |
| 1543 | return PTR_ERR(bh); |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1544 | eh = ext_block_hdr(bh); |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1545 | ex = EXT_FIRST_EXTENT(eh); |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 1546 | found_extent: |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1547 | *logical = le32_to_cpu(ex->ee_block); |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 1548 | *phys = ext4_ext_pblock(ex); |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 1549 | *ret_ex = ex; |
| 1550 | if (bh) |
| 1551 | put_bh(bh); |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1552 | return 0; |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1553 | } |
| 1554 | |
| 1555 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1556 | * ext4_ext_next_allocated_block: |
Lukas Czerner | f17722f | 2011-06-06 00:05:17 -0400 | [diff] [blame] | 1557 | * returns allocated block in subsequent extent or EXT_MAX_BLOCKS. |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1558 | * NOTE: it considers block number from index entry as |
| 1559 | * allocated block. Thus, index entries have to be consistent |
| 1560 | * with leaves. |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1561 | */ |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1562 | static ext4_lblk_t |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1563 | ext4_ext_next_allocated_block(struct ext4_ext_path *path) |
| 1564 | { |
| 1565 | int depth; |
| 1566 | |
| 1567 | BUG_ON(path == NULL); |
| 1568 | depth = path->p_depth; |
| 1569 | |
| 1570 | if (depth == 0 && path->p_ext == NULL) |
Lukas Czerner | f17722f | 2011-06-06 00:05:17 -0400 | [diff] [blame] | 1571 | return EXT_MAX_BLOCKS; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1572 | |
| 1573 | while (depth >= 0) { |
| 1574 | if (depth == path->p_depth) { |
| 1575 | /* leaf */ |
Curt Wohlgemuth | 6f8ff53 | 2011-10-26 04:38:59 -0400 | [diff] [blame] | 1576 | if (path[depth].p_ext && |
| 1577 | path[depth].p_ext != |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1578 | EXT_LAST_EXTENT(path[depth].p_hdr)) |
| 1579 | return le32_to_cpu(path[depth].p_ext[1].ee_block); |
| 1580 | } else { |
| 1581 | /* index */ |
| 1582 | if (path[depth].p_idx != |
| 1583 | EXT_LAST_INDEX(path[depth].p_hdr)) |
| 1584 | return le32_to_cpu(path[depth].p_idx[1].ei_block); |
| 1585 | } |
| 1586 | depth--; |
| 1587 | } |
| 1588 | |
Lukas Czerner | f17722f | 2011-06-06 00:05:17 -0400 | [diff] [blame] | 1589 | return EXT_MAX_BLOCKS; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1590 | } |
| 1591 | |
| 1592 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1593 | * ext4_ext_next_leaf_block: |
Lukas Czerner | f17722f | 2011-06-06 00:05:17 -0400 | [diff] [blame] | 1594 | * returns first allocated block from next leaf or EXT_MAX_BLOCKS |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1595 | */ |
Robin Dong | 5718789 | 2011-07-23 21:49:07 -0400 | [diff] [blame] | 1596 | static ext4_lblk_t ext4_ext_next_leaf_block(struct ext4_ext_path *path) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1597 | { |
| 1598 | int depth; |
| 1599 | |
| 1600 | BUG_ON(path == NULL); |
| 1601 | depth = path->p_depth; |
| 1602 | |
| 1603 | /* zero-tree has no leaf blocks at all */ |
| 1604 | if (depth == 0) |
Lukas Czerner | f17722f | 2011-06-06 00:05:17 -0400 | [diff] [blame] | 1605 | return EXT_MAX_BLOCKS; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1606 | |
| 1607 | /* go to index block */ |
| 1608 | depth--; |
| 1609 | |
| 1610 | while (depth >= 0) { |
| 1611 | if (path[depth].p_idx != |
| 1612 | EXT_LAST_INDEX(path[depth].p_hdr)) |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1613 | return (ext4_lblk_t) |
| 1614 | le32_to_cpu(path[depth].p_idx[1].ei_block); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1615 | depth--; |
| 1616 | } |
| 1617 | |
Lukas Czerner | f17722f | 2011-06-06 00:05:17 -0400 | [diff] [blame] | 1618 | return EXT_MAX_BLOCKS; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1619 | } |
| 1620 | |
| 1621 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1622 | * ext4_ext_correct_indexes: |
| 1623 | * if leaf gets modified and modified extent is first in the leaf, |
| 1624 | * then we have to correct all indexes above. |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1625 | * TODO: do we need to correct tree in all cases? |
| 1626 | */ |
Aneesh Kumar K.V | 1d03ec9 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1627 | static int ext4_ext_correct_indexes(handle_t *handle, struct inode *inode, |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1628 | struct ext4_ext_path *path) |
| 1629 | { |
| 1630 | struct ext4_extent_header *eh; |
| 1631 | int depth = ext_depth(inode); |
| 1632 | struct ext4_extent *ex; |
| 1633 | __le32 border; |
| 1634 | int k, err = 0; |
| 1635 | |
| 1636 | eh = path[depth].p_hdr; |
| 1637 | ex = path[depth].p_ext; |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1638 | |
| 1639 | if (unlikely(ex == NULL || eh == NULL)) { |
| 1640 | EXT4_ERROR_INODE(inode, |
| 1641 | "ex %p == NULL or eh %p == NULL", ex, eh); |
| 1642 | return -EIO; |
| 1643 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1644 | |
| 1645 | if (depth == 0) { |
| 1646 | /* there is no tree at all */ |
| 1647 | return 0; |
| 1648 | } |
| 1649 | |
| 1650 | if (ex != EXT_FIRST_EXTENT(eh)) { |
| 1651 | /* we correct tree if first leaf got modified only */ |
| 1652 | return 0; |
| 1653 | } |
| 1654 | |
| 1655 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1656 | * TODO: we need correction if border is smaller than current one |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1657 | */ |
| 1658 | k = depth - 1; |
| 1659 | border = path[depth].p_ext->ee_block; |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 1660 | err = ext4_ext_get_access(handle, inode, path + k); |
| 1661 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1662 | return err; |
| 1663 | path[k].p_idx->ei_block = border; |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 1664 | err = ext4_ext_dirty(handle, inode, path + k); |
| 1665 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1666 | return err; |
| 1667 | |
| 1668 | while (k--) { |
| 1669 | /* change all left-side indexes */ |
| 1670 | if (path[k+1].p_idx != EXT_FIRST_INDEX(path[k+1].p_hdr)) |
| 1671 | break; |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 1672 | err = ext4_ext_get_access(handle, inode, path + k); |
| 1673 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1674 | break; |
| 1675 | path[k].p_idx->ei_block = border; |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 1676 | err = ext4_ext_dirty(handle, inode, path + k); |
| 1677 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1678 | break; |
| 1679 | } |
| 1680 | |
| 1681 | return err; |
| 1682 | } |
| 1683 | |
Akira Fujita | 748de67 | 2009-06-17 19:24:03 -0400 | [diff] [blame] | 1684 | int |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1685 | ext4_can_extents_be_merged(struct inode *inode, struct ext4_extent *ex1, |
| 1686 | struct ext4_extent *ex2) |
| 1687 | { |
Eric Sandeen | da0169b | 2013-11-04 09:58:26 -0500 | [diff] [blame] | 1688 | unsigned short ext1_ee_len, ext2_ee_len; |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 1689 | |
| 1690 | /* |
Dmitry Monakhov | ec22ba8 | 2013-03-04 00:36:06 -0500 | [diff] [blame] | 1691 | * Make sure that both extents are initialized. We don't merge |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 1692 | * unwritten extents so that we can be sure that end_io code has |
Dmitry Monakhov | ec22ba8 | 2013-03-04 00:36:06 -0500 | [diff] [blame] | 1693 | * the extent that was written properly split out and conversion to |
| 1694 | * initialized is trivial. |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 1695 | */ |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 1696 | if (ext4_ext_is_unwritten(ex1) != ext4_ext_is_unwritten(ex2)) |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 1697 | return 0; |
| 1698 | |
| 1699 | ext1_ee_len = ext4_ext_get_actual_len(ex1); |
| 1700 | ext2_ee_len = ext4_ext_get_actual_len(ex2); |
| 1701 | |
| 1702 | if (le32_to_cpu(ex1->ee_block) + ext1_ee_len != |
Andrew Morton | 63f5793 | 2006-10-11 01:21:24 -0700 | [diff] [blame] | 1703 | le32_to_cpu(ex2->ee_block)) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1704 | return 0; |
| 1705 | |
Suparna Bhattacharya | 471d401 | 2006-10-11 01:21:06 -0700 | [diff] [blame] | 1706 | /* |
| 1707 | * To allow future support for preallocated extents to be added |
| 1708 | * as an RO_COMPAT feature, refuse to merge to extents if |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1709 | * this can result in the top bit of ee_len being set. |
Suparna Bhattacharya | 471d401 | 2006-10-11 01:21:06 -0700 | [diff] [blame] | 1710 | */ |
Eric Sandeen | da0169b | 2013-11-04 09:58:26 -0500 | [diff] [blame] | 1711 | if (ext1_ee_len + ext2_ee_len > EXT_INIT_MAX_LEN) |
Suparna Bhattacharya | 471d401 | 2006-10-11 01:21:06 -0700 | [diff] [blame] | 1712 | return 0; |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 1713 | if (ext4_ext_is_unwritten(ex1) && |
Darrick J. Wong | a9b8241 | 2014-02-20 21:17:35 -0500 | [diff] [blame] | 1714 | (ext4_test_inode_state(inode, EXT4_STATE_DIO_UNWRITTEN) || |
| 1715 | atomic_read(&EXT4_I(inode)->i_unwritten) || |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 1716 | (ext1_ee_len + ext2_ee_len > EXT_UNWRITTEN_MAX_LEN))) |
Darrick J. Wong | a9b8241 | 2014-02-20 21:17:35 -0500 | [diff] [blame] | 1717 | return 0; |
Robert P. J. Day | bbf2f9f | 2007-02-17 19:20:16 +0100 | [diff] [blame] | 1718 | #ifdef AGGRESSIVE_TEST |
Aneesh Kumar K.V | b939e37 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1719 | if (ext1_ee_len >= 4) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1720 | return 0; |
| 1721 | #endif |
| 1722 | |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 1723 | if (ext4_ext_pblock(ex1) + ext1_ee_len == ext4_ext_pblock(ex2)) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1724 | return 1; |
| 1725 | return 0; |
| 1726 | } |
| 1727 | |
| 1728 | /* |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 1729 | * This function tries to merge the "ex" extent to the next extent in the tree. |
| 1730 | * It always tries to merge towards right. If you want to merge towards |
| 1731 | * left, pass "ex - 1" as argument instead of "ex". |
| 1732 | * Returns 0 if the extents (ex and ex+1) were _not_ merged and returns |
| 1733 | * 1 if they got merged. |
| 1734 | */ |
Yongqiang Yang | 197217a | 2011-05-03 11:45:29 -0400 | [diff] [blame] | 1735 | static int ext4_ext_try_to_merge_right(struct inode *inode, |
Theodore Ts'o | 1f109d5 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 1736 | struct ext4_ext_path *path, |
| 1737 | struct ext4_extent *ex) |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 1738 | { |
| 1739 | struct ext4_extent_header *eh; |
| 1740 | unsigned int depth, len; |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 1741 | int merge_done = 0, unwritten; |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 1742 | |
| 1743 | depth = ext_depth(inode); |
| 1744 | BUG_ON(path[depth].p_hdr == NULL); |
| 1745 | eh = path[depth].p_hdr; |
| 1746 | |
| 1747 | while (ex < EXT_LAST_EXTENT(eh)) { |
| 1748 | if (!ext4_can_extents_be_merged(inode, ex, ex + 1)) |
| 1749 | break; |
| 1750 | /* merge with next extent! */ |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 1751 | unwritten = ext4_ext_is_unwritten(ex); |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 1752 | ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex) |
| 1753 | + ext4_ext_get_actual_len(ex + 1)); |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 1754 | if (unwritten) |
| 1755 | ext4_ext_mark_unwritten(ex); |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 1756 | |
| 1757 | if (ex + 1 < EXT_LAST_EXTENT(eh)) { |
| 1758 | len = (EXT_LAST_EXTENT(eh) - ex - 1) |
| 1759 | * sizeof(struct ext4_extent); |
| 1760 | memmove(ex + 1, ex + 2, len); |
| 1761 | } |
Marcin Slusarz | e8546d0 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 1762 | le16_add_cpu(&eh->eh_entries, -1); |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 1763 | merge_done = 1; |
| 1764 | WARN_ON(eh->eh_entries == 0); |
| 1765 | if (!eh->eh_entries) |
Theodore Ts'o | 24676da | 2010-05-16 21:00:00 -0400 | [diff] [blame] | 1766 | EXT4_ERROR_INODE(inode, "eh->eh_entries = 0!"); |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 1767 | } |
| 1768 | |
| 1769 | return merge_done; |
| 1770 | } |
| 1771 | |
| 1772 | /* |
Theodore Ts'o | ecb94f5 | 2012-08-17 09:44:17 -0400 | [diff] [blame] | 1773 | * This function does a very simple check to see if we can collapse |
| 1774 | * an extent tree with a single extent tree leaf block into the inode. |
| 1775 | */ |
| 1776 | static void ext4_ext_try_to_merge_up(handle_t *handle, |
| 1777 | struct inode *inode, |
| 1778 | struct ext4_ext_path *path) |
| 1779 | { |
| 1780 | size_t s; |
| 1781 | unsigned max_root = ext4_ext_space_root(inode, 0); |
| 1782 | ext4_fsblk_t blk; |
| 1783 | |
| 1784 | if ((path[0].p_depth != 1) || |
| 1785 | (le16_to_cpu(path[0].p_hdr->eh_entries) != 1) || |
| 1786 | (le16_to_cpu(path[1].p_hdr->eh_entries) > max_root)) |
| 1787 | return; |
| 1788 | |
| 1789 | /* |
| 1790 | * We need to modify the block allocation bitmap and the block |
| 1791 | * group descriptor to release the extent tree block. If we |
| 1792 | * can't get the journal credits, give up. |
| 1793 | */ |
| 1794 | if (ext4_journal_extend(handle, 2)) |
| 1795 | return; |
| 1796 | |
| 1797 | /* |
| 1798 | * Copy the extent data up to the inode |
| 1799 | */ |
| 1800 | blk = ext4_idx_pblock(path[0].p_idx); |
| 1801 | s = le16_to_cpu(path[1].p_hdr->eh_entries) * |
| 1802 | sizeof(struct ext4_extent_idx); |
| 1803 | s += sizeof(struct ext4_extent_header); |
| 1804 | |
| 1805 | memcpy(path[0].p_hdr, path[1].p_hdr, s); |
| 1806 | path[0].p_depth = 0; |
| 1807 | path[0].p_ext = EXT_FIRST_EXTENT(path[0].p_hdr) + |
| 1808 | (path[1].p_ext - EXT_FIRST_EXTENT(path[1].p_hdr)); |
| 1809 | path[0].p_hdr->eh_max = cpu_to_le16(max_root); |
| 1810 | |
| 1811 | brelse(path[1].p_bh); |
| 1812 | ext4_free_blocks(handle, inode, NULL, blk, 1, |
Theodore Ts'o | 71d4f7d | 2014-07-15 06:02:38 -0400 | [diff] [blame] | 1813 | EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET); |
Theodore Ts'o | ecb94f5 | 2012-08-17 09:44:17 -0400 | [diff] [blame] | 1814 | } |
| 1815 | |
| 1816 | /* |
Yongqiang Yang | 197217a | 2011-05-03 11:45:29 -0400 | [diff] [blame] | 1817 | * This function tries to merge the @ex extent to neighbours in the tree. |
| 1818 | * return 1 if merge left else 0. |
| 1819 | */ |
Theodore Ts'o | ecb94f5 | 2012-08-17 09:44:17 -0400 | [diff] [blame] | 1820 | static void ext4_ext_try_to_merge(handle_t *handle, |
| 1821 | struct inode *inode, |
Yongqiang Yang | 197217a | 2011-05-03 11:45:29 -0400 | [diff] [blame] | 1822 | struct ext4_ext_path *path, |
| 1823 | struct ext4_extent *ex) { |
| 1824 | struct ext4_extent_header *eh; |
| 1825 | unsigned int depth; |
| 1826 | int merge_done = 0; |
Yongqiang Yang | 197217a | 2011-05-03 11:45:29 -0400 | [diff] [blame] | 1827 | |
| 1828 | depth = ext_depth(inode); |
| 1829 | BUG_ON(path[depth].p_hdr == NULL); |
| 1830 | eh = path[depth].p_hdr; |
| 1831 | |
| 1832 | if (ex > EXT_FIRST_EXTENT(eh)) |
| 1833 | merge_done = ext4_ext_try_to_merge_right(inode, path, ex - 1); |
| 1834 | |
| 1835 | if (!merge_done) |
Theodore Ts'o | ecb94f5 | 2012-08-17 09:44:17 -0400 | [diff] [blame] | 1836 | (void) ext4_ext_try_to_merge_right(inode, path, ex); |
Yongqiang Yang | 197217a | 2011-05-03 11:45:29 -0400 | [diff] [blame] | 1837 | |
Theodore Ts'o | ecb94f5 | 2012-08-17 09:44:17 -0400 | [diff] [blame] | 1838 | ext4_ext_try_to_merge_up(handle, inode, path); |
Yongqiang Yang | 197217a | 2011-05-03 11:45:29 -0400 | [diff] [blame] | 1839 | } |
| 1840 | |
| 1841 | /* |
Amit Arora | 25d14f9 | 2007-05-24 13:04:13 -0400 | [diff] [blame] | 1842 | * check if a portion of the "newext" extent overlaps with an |
| 1843 | * existing extent. |
| 1844 | * |
| 1845 | * If there is an overlap discovered, it updates the length of the newext |
| 1846 | * such that there will be no overlap, and then returns 1. |
| 1847 | * If there is no overlap found, it returns 0. |
| 1848 | */ |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 1849 | static unsigned int ext4_ext_check_overlap(struct ext4_sb_info *sbi, |
| 1850 | struct inode *inode, |
Theodore Ts'o | 1f109d5 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 1851 | struct ext4_extent *newext, |
| 1852 | struct ext4_ext_path *path) |
Amit Arora | 25d14f9 | 2007-05-24 13:04:13 -0400 | [diff] [blame] | 1853 | { |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1854 | ext4_lblk_t b1, b2; |
Amit Arora | 25d14f9 | 2007-05-24 13:04:13 -0400 | [diff] [blame] | 1855 | unsigned int depth, len1; |
| 1856 | unsigned int ret = 0; |
| 1857 | |
| 1858 | b1 = le32_to_cpu(newext->ee_block); |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 1859 | len1 = ext4_ext_get_actual_len(newext); |
Amit Arora | 25d14f9 | 2007-05-24 13:04:13 -0400 | [diff] [blame] | 1860 | depth = ext_depth(inode); |
| 1861 | if (!path[depth].p_ext) |
| 1862 | goto out; |
Theodore Ts'o | f5a44db | 2013-12-20 09:29:35 -0500 | [diff] [blame] | 1863 | b2 = EXT4_LBLK_CMASK(sbi, le32_to_cpu(path[depth].p_ext->ee_block)); |
Amit Arora | 25d14f9 | 2007-05-24 13:04:13 -0400 | [diff] [blame] | 1864 | |
| 1865 | /* |
| 1866 | * get the next allocated block if the extent in the path |
Theodore Ts'o | 2b2d6d0 | 2008-07-26 16:15:44 -0400 | [diff] [blame] | 1867 | * is before the requested block(s) |
Amit Arora | 25d14f9 | 2007-05-24 13:04:13 -0400 | [diff] [blame] | 1868 | */ |
| 1869 | if (b2 < b1) { |
| 1870 | b2 = ext4_ext_next_allocated_block(path); |
Lukas Czerner | f17722f | 2011-06-06 00:05:17 -0400 | [diff] [blame] | 1871 | if (b2 == EXT_MAX_BLOCKS) |
Amit Arora | 25d14f9 | 2007-05-24 13:04:13 -0400 | [diff] [blame] | 1872 | goto out; |
Theodore Ts'o | f5a44db | 2013-12-20 09:29:35 -0500 | [diff] [blame] | 1873 | b2 = EXT4_LBLK_CMASK(sbi, b2); |
Amit Arora | 25d14f9 | 2007-05-24 13:04:13 -0400 | [diff] [blame] | 1874 | } |
| 1875 | |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1876 | /* check for wrap through zero on extent logical start block*/ |
Amit Arora | 25d14f9 | 2007-05-24 13:04:13 -0400 | [diff] [blame] | 1877 | if (b1 + len1 < b1) { |
Lukas Czerner | f17722f | 2011-06-06 00:05:17 -0400 | [diff] [blame] | 1878 | len1 = EXT_MAX_BLOCKS - b1; |
Amit Arora | 25d14f9 | 2007-05-24 13:04:13 -0400 | [diff] [blame] | 1879 | newext->ee_len = cpu_to_le16(len1); |
| 1880 | ret = 1; |
| 1881 | } |
| 1882 | |
| 1883 | /* check for overlap */ |
| 1884 | if (b1 + len1 > b2) { |
| 1885 | newext->ee_len = cpu_to_le16(b2 - b1); |
| 1886 | ret = 1; |
| 1887 | } |
| 1888 | out: |
| 1889 | return ret; |
| 1890 | } |
| 1891 | |
| 1892 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1893 | * ext4_ext_insert_extent: |
| 1894 | * tries to merge requsted extent into the existing extent or |
| 1895 | * inserts requested extent as new one into the tree, |
| 1896 | * creating new leaf in the no-space case. |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1897 | */ |
| 1898 | int ext4_ext_insert_extent(handle_t *handle, struct inode *inode, |
| 1899 | struct ext4_ext_path *path, |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 1900 | struct ext4_extent *newext, int gb_flags) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1901 | { |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1902 | struct ext4_extent_header *eh; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1903 | struct ext4_extent *ex, *fex; |
| 1904 | struct ext4_extent *nearex; /* nearest extent */ |
| 1905 | struct ext4_ext_path *npath = NULL; |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1906 | int depth, len, err; |
| 1907 | ext4_lblk_t next; |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 1908 | int mb_flags = 0, unwritten; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1909 | |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1910 | if (unlikely(ext4_ext_get_actual_len(newext) == 0)) { |
| 1911 | EXT4_ERROR_INODE(inode, "ext4_ext_get_actual_len(newext) == 0"); |
| 1912 | return -EIO; |
| 1913 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1914 | depth = ext_depth(inode); |
| 1915 | ex = path[depth].p_ext; |
Lukas Czerner | be8981b | 2013-04-03 23:33:28 -0400 | [diff] [blame] | 1916 | eh = path[depth].p_hdr; |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1917 | if (unlikely(path[depth].p_hdr == NULL)) { |
| 1918 | EXT4_ERROR_INODE(inode, "path[%d].p_hdr == NULL", depth); |
| 1919 | return -EIO; |
| 1920 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1921 | |
| 1922 | /* try to insert block into found extent and return */ |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 1923 | if (ex && !(gb_flags & EXT4_GET_BLOCKS_PRE_IO)) { |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 1924 | |
| 1925 | /* |
Lukas Czerner | be8981b | 2013-04-03 23:33:28 -0400 | [diff] [blame] | 1926 | * Try to see whether we should rather test the extent on |
| 1927 | * right from ex, or from the left of ex. This is because |
| 1928 | * ext4_ext_find_extent() can return either extent on the |
| 1929 | * left, or on the right from the searched position. This |
| 1930 | * will make merging more effective. |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 1931 | */ |
Lukas Czerner | be8981b | 2013-04-03 23:33:28 -0400 | [diff] [blame] | 1932 | if (ex < EXT_LAST_EXTENT(eh) && |
| 1933 | (le32_to_cpu(ex->ee_block) + |
| 1934 | ext4_ext_get_actual_len(ex) < |
| 1935 | le32_to_cpu(newext->ee_block))) { |
| 1936 | ex += 1; |
| 1937 | goto prepend; |
| 1938 | } else if ((ex > EXT_FIRST_EXTENT(eh)) && |
| 1939 | (le32_to_cpu(newext->ee_block) + |
| 1940 | ext4_ext_get_actual_len(newext) < |
| 1941 | le32_to_cpu(ex->ee_block))) |
| 1942 | ex -= 1; |
| 1943 | |
| 1944 | /* Try to append newex to the ex */ |
| 1945 | if (ext4_can_extents_be_merged(inode, ex, newext)) { |
| 1946 | ext_debug("append [%d]%d block to %u:[%d]%d" |
| 1947 | "(from %llu)\n", |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 1948 | ext4_ext_is_unwritten(newext), |
Lukas Czerner | be8981b | 2013-04-03 23:33:28 -0400 | [diff] [blame] | 1949 | ext4_ext_get_actual_len(newext), |
| 1950 | le32_to_cpu(ex->ee_block), |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 1951 | ext4_ext_is_unwritten(ex), |
Lukas Czerner | be8981b | 2013-04-03 23:33:28 -0400 | [diff] [blame] | 1952 | ext4_ext_get_actual_len(ex), |
| 1953 | ext4_ext_pblock(ex)); |
| 1954 | err = ext4_ext_get_access(handle, inode, |
| 1955 | path + depth); |
| 1956 | if (err) |
| 1957 | return err; |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 1958 | unwritten = ext4_ext_is_unwritten(ex); |
Lukas Czerner | be8981b | 2013-04-03 23:33:28 -0400 | [diff] [blame] | 1959 | ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex) |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 1960 | + ext4_ext_get_actual_len(newext)); |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 1961 | if (unwritten) |
| 1962 | ext4_ext_mark_unwritten(ex); |
Lukas Czerner | be8981b | 2013-04-03 23:33:28 -0400 | [diff] [blame] | 1963 | eh = path[depth].p_hdr; |
| 1964 | nearex = ex; |
| 1965 | goto merge; |
| 1966 | } |
| 1967 | |
| 1968 | prepend: |
| 1969 | /* Try to prepend newex to the ex */ |
| 1970 | if (ext4_can_extents_be_merged(inode, newext, ex)) { |
| 1971 | ext_debug("prepend %u[%d]%d block to %u:[%d]%d" |
| 1972 | "(from %llu)\n", |
| 1973 | le32_to_cpu(newext->ee_block), |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 1974 | ext4_ext_is_unwritten(newext), |
Lukas Czerner | be8981b | 2013-04-03 23:33:28 -0400 | [diff] [blame] | 1975 | ext4_ext_get_actual_len(newext), |
| 1976 | le32_to_cpu(ex->ee_block), |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 1977 | ext4_ext_is_unwritten(ex), |
Lukas Czerner | be8981b | 2013-04-03 23:33:28 -0400 | [diff] [blame] | 1978 | ext4_ext_get_actual_len(ex), |
| 1979 | ext4_ext_pblock(ex)); |
| 1980 | err = ext4_ext_get_access(handle, inode, |
| 1981 | path + depth); |
| 1982 | if (err) |
| 1983 | return err; |
| 1984 | |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 1985 | unwritten = ext4_ext_is_unwritten(ex); |
Lukas Czerner | be8981b | 2013-04-03 23:33:28 -0400 | [diff] [blame] | 1986 | ex->ee_block = newext->ee_block; |
| 1987 | ext4_ext_store_pblock(ex, ext4_ext_pblock(newext)); |
| 1988 | ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex) |
| 1989 | + ext4_ext_get_actual_len(newext)); |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 1990 | if (unwritten) |
| 1991 | ext4_ext_mark_unwritten(ex); |
Lukas Czerner | be8981b | 2013-04-03 23:33:28 -0400 | [diff] [blame] | 1992 | eh = path[depth].p_hdr; |
| 1993 | nearex = ex; |
| 1994 | goto merge; |
| 1995 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1996 | } |
| 1997 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1998 | depth = ext_depth(inode); |
| 1999 | eh = path[depth].p_hdr; |
| 2000 | if (le16_to_cpu(eh->eh_entries) < le16_to_cpu(eh->eh_max)) |
| 2001 | goto has_space; |
| 2002 | |
| 2003 | /* probably next leaf has space for us? */ |
| 2004 | fex = EXT_LAST_EXTENT(eh); |
Robin Dong | 598dbdf | 2011-07-11 18:24:01 -0400 | [diff] [blame] | 2005 | next = EXT_MAX_BLOCKS; |
| 2006 | if (le32_to_cpu(newext->ee_block) > le32_to_cpu(fex->ee_block)) |
Robin Dong | 5718789 | 2011-07-23 21:49:07 -0400 | [diff] [blame] | 2007 | next = ext4_ext_next_leaf_block(path); |
Robin Dong | 598dbdf | 2011-07-11 18:24:01 -0400 | [diff] [blame] | 2008 | if (next != EXT_MAX_BLOCKS) { |
Yongqiang Yang | 32de675 | 2011-11-01 18:56:41 -0400 | [diff] [blame] | 2009 | ext_debug("next leaf block - %u\n", next); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2010 | BUG_ON(npath != NULL); |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 2011 | npath = ext4_ext_find_extent(inode, next, NULL, 0); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2012 | if (IS_ERR(npath)) |
| 2013 | return PTR_ERR(npath); |
| 2014 | BUG_ON(npath->p_depth != path->p_depth); |
| 2015 | eh = npath[depth].p_hdr; |
| 2016 | if (le16_to_cpu(eh->eh_entries) < le16_to_cpu(eh->eh_max)) { |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2017 | ext_debug("next leaf isn't full(%d)\n", |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2018 | le16_to_cpu(eh->eh_entries)); |
| 2019 | path = npath; |
Robin Dong | ffb505f | 2011-07-11 11:43:59 -0400 | [diff] [blame] | 2020 | goto has_space; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2021 | } |
| 2022 | ext_debug("next leaf has no free space(%d,%d)\n", |
| 2023 | le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max)); |
| 2024 | } |
| 2025 | |
| 2026 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 2027 | * There is no free space in the found leaf. |
| 2028 | * We're gonna add a new leaf in the tree. |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2029 | */ |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 2030 | if (gb_flags & EXT4_GET_BLOCKS_METADATA_NOFAIL) |
| 2031 | mb_flags = EXT4_MB_USE_RESERVED; |
| 2032 | err = ext4_ext_create_new_leaf(handle, inode, mb_flags, gb_flags, |
| 2033 | path, newext); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2034 | if (err) |
| 2035 | goto cleanup; |
| 2036 | depth = ext_depth(inode); |
| 2037 | eh = path[depth].p_hdr; |
| 2038 | |
| 2039 | has_space: |
| 2040 | nearex = path[depth].p_ext; |
| 2041 | |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 2042 | err = ext4_ext_get_access(handle, inode, path + depth); |
| 2043 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2044 | goto cleanup; |
| 2045 | |
| 2046 | if (!nearex) { |
| 2047 | /* there is no extent in this leaf, create first one */ |
Yongqiang Yang | 32de675 | 2011-11-01 18:56:41 -0400 | [diff] [blame] | 2048 | ext_debug("first extent in the leaf: %u:%llu:[%d]%d\n", |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 2049 | le32_to_cpu(newext->ee_block), |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 2050 | ext4_ext_pblock(newext), |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 2051 | ext4_ext_is_unwritten(newext), |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 2052 | ext4_ext_get_actual_len(newext)); |
Eric Gouriou | 80e675f | 2011-10-27 11:52:18 -0400 | [diff] [blame] | 2053 | nearex = EXT_FIRST_EXTENT(eh); |
| 2054 | } else { |
| 2055 | if (le32_to_cpu(newext->ee_block) |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 2056 | > le32_to_cpu(nearex->ee_block)) { |
Eric Gouriou | 80e675f | 2011-10-27 11:52:18 -0400 | [diff] [blame] | 2057 | /* Insert after */ |
Yongqiang Yang | 32de675 | 2011-11-01 18:56:41 -0400 | [diff] [blame] | 2058 | ext_debug("insert %u:%llu:[%d]%d before: " |
| 2059 | "nearest %p\n", |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 2060 | le32_to_cpu(newext->ee_block), |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 2061 | ext4_ext_pblock(newext), |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 2062 | ext4_ext_is_unwritten(newext), |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 2063 | ext4_ext_get_actual_len(newext), |
Eric Gouriou | 80e675f | 2011-10-27 11:52:18 -0400 | [diff] [blame] | 2064 | nearex); |
| 2065 | nearex++; |
| 2066 | } else { |
| 2067 | /* Insert before */ |
| 2068 | BUG_ON(newext->ee_block == nearex->ee_block); |
Yongqiang Yang | 32de675 | 2011-11-01 18:56:41 -0400 | [diff] [blame] | 2069 | ext_debug("insert %u:%llu:[%d]%d after: " |
| 2070 | "nearest %p\n", |
Eric Gouriou | 80e675f | 2011-10-27 11:52:18 -0400 | [diff] [blame] | 2071 | le32_to_cpu(newext->ee_block), |
| 2072 | ext4_ext_pblock(newext), |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 2073 | ext4_ext_is_unwritten(newext), |
Eric Gouriou | 80e675f | 2011-10-27 11:52:18 -0400 | [diff] [blame] | 2074 | ext4_ext_get_actual_len(newext), |
| 2075 | nearex); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2076 | } |
Eric Gouriou | 80e675f | 2011-10-27 11:52:18 -0400 | [diff] [blame] | 2077 | len = EXT_LAST_EXTENT(eh) - nearex + 1; |
| 2078 | if (len > 0) { |
Yongqiang Yang | 32de675 | 2011-11-01 18:56:41 -0400 | [diff] [blame] | 2079 | ext_debug("insert %u:%llu:[%d]%d: " |
Eric Gouriou | 80e675f | 2011-10-27 11:52:18 -0400 | [diff] [blame] | 2080 | "move %d extents from 0x%p to 0x%p\n", |
| 2081 | le32_to_cpu(newext->ee_block), |
| 2082 | ext4_ext_pblock(newext), |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 2083 | ext4_ext_is_unwritten(newext), |
Eric Gouriou | 80e675f | 2011-10-27 11:52:18 -0400 | [diff] [blame] | 2084 | ext4_ext_get_actual_len(newext), |
| 2085 | len, nearex, nearex + 1); |
| 2086 | memmove(nearex + 1, nearex, |
| 2087 | len * sizeof(struct ext4_extent)); |
| 2088 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2089 | } |
| 2090 | |
Marcin Slusarz | e8546d0 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 2091 | le16_add_cpu(&eh->eh_entries, 1); |
Eric Gouriou | 80e675f | 2011-10-27 11:52:18 -0400 | [diff] [blame] | 2092 | path[depth].p_ext = nearex; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2093 | nearex->ee_block = newext->ee_block; |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 2094 | ext4_ext_store_pblock(nearex, ext4_ext_pblock(newext)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2095 | nearex->ee_len = newext->ee_len; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2096 | |
| 2097 | merge: |
HaiboLiu | e7bcf82 | 2012-07-09 16:29:28 -0400 | [diff] [blame] | 2098 | /* try to merge extents */ |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 2099 | if (!(gb_flags & EXT4_GET_BLOCKS_PRE_IO)) |
Theodore Ts'o | ecb94f5 | 2012-08-17 09:44:17 -0400 | [diff] [blame] | 2100 | ext4_ext_try_to_merge(handle, inode, path, nearex); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2101 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2102 | |
| 2103 | /* time to correct all indexes above */ |
| 2104 | err = ext4_ext_correct_indexes(handle, inode, path); |
| 2105 | if (err) |
| 2106 | goto cleanup; |
| 2107 | |
Theodore Ts'o | ecb94f5 | 2012-08-17 09:44:17 -0400 | [diff] [blame] | 2108 | err = ext4_ext_dirty(handle, inode, path + path->p_depth); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2109 | |
| 2110 | cleanup: |
| 2111 | if (npath) { |
| 2112 | ext4_ext_drop_refs(npath); |
| 2113 | kfree(npath); |
| 2114 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2115 | return err; |
| 2116 | } |
| 2117 | |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2118 | static int ext4_fill_fiemap_extents(struct inode *inode, |
| 2119 | ext4_lblk_t block, ext4_lblk_t num, |
| 2120 | struct fiemap_extent_info *fieinfo) |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2121 | { |
| 2122 | struct ext4_ext_path *path = NULL; |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2123 | struct ext4_extent *ex; |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 2124 | struct extent_status es; |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2125 | ext4_lblk_t next, next_del, start = 0, end = 0; |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2126 | ext4_lblk_t last = block + num; |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2127 | int exists, depth = 0, err = 0; |
| 2128 | unsigned int flags = 0; |
| 2129 | unsigned char blksize_bits = inode->i_sb->s_blocksize_bits; |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2130 | |
Lukas Czerner | f17722f | 2011-06-06 00:05:17 -0400 | [diff] [blame] | 2131 | while (block < last && block != EXT_MAX_BLOCKS) { |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2132 | num = last - block; |
| 2133 | /* find extent for this block */ |
Theodore Ts'o | fab3a54 | 2009-12-09 21:30:02 -0500 | [diff] [blame] | 2134 | down_read(&EXT4_I(inode)->i_data_sem); |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2135 | |
| 2136 | if (path && ext_depth(inode) != depth) { |
| 2137 | /* depth was changed. we have to realloc path */ |
| 2138 | kfree(path); |
| 2139 | path = NULL; |
| 2140 | } |
| 2141 | |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 2142 | path = ext4_ext_find_extent(inode, block, path, 0); |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2143 | if (IS_ERR(path)) { |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2144 | up_read(&EXT4_I(inode)->i_data_sem); |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2145 | err = PTR_ERR(path); |
| 2146 | path = NULL; |
| 2147 | break; |
| 2148 | } |
| 2149 | |
| 2150 | depth = ext_depth(inode); |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 2151 | if (unlikely(path[depth].p_hdr == NULL)) { |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2152 | up_read(&EXT4_I(inode)->i_data_sem); |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 2153 | EXT4_ERROR_INODE(inode, "path[%d].p_hdr == NULL", depth); |
| 2154 | err = -EIO; |
| 2155 | break; |
| 2156 | } |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2157 | ex = path[depth].p_ext; |
| 2158 | next = ext4_ext_next_allocated_block(path); |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2159 | ext4_ext_drop_refs(path); |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2160 | |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2161 | flags = 0; |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2162 | exists = 0; |
| 2163 | if (!ex) { |
| 2164 | /* there is no extent yet, so try to allocate |
| 2165 | * all requested space */ |
| 2166 | start = block; |
| 2167 | end = block + num; |
| 2168 | } else if (le32_to_cpu(ex->ee_block) > block) { |
| 2169 | /* need to allocate space before found extent */ |
| 2170 | start = block; |
| 2171 | end = le32_to_cpu(ex->ee_block); |
| 2172 | if (block + num < end) |
| 2173 | end = block + num; |
| 2174 | } else if (block >= le32_to_cpu(ex->ee_block) |
| 2175 | + ext4_ext_get_actual_len(ex)) { |
| 2176 | /* need to allocate space after found extent */ |
| 2177 | start = block; |
| 2178 | end = block + num; |
| 2179 | if (end >= next) |
| 2180 | end = next; |
| 2181 | } else if (block >= le32_to_cpu(ex->ee_block)) { |
| 2182 | /* |
| 2183 | * some part of requested space is covered |
| 2184 | * by found extent |
| 2185 | */ |
| 2186 | start = block; |
| 2187 | end = le32_to_cpu(ex->ee_block) |
| 2188 | + ext4_ext_get_actual_len(ex); |
| 2189 | if (block + num < end) |
| 2190 | end = block + num; |
| 2191 | exists = 1; |
| 2192 | } else { |
| 2193 | BUG(); |
| 2194 | } |
| 2195 | BUG_ON(end <= start); |
| 2196 | |
| 2197 | if (!exists) { |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 2198 | es.es_lblk = start; |
| 2199 | es.es_len = end - start; |
| 2200 | es.es_pblk = 0; |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2201 | } else { |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 2202 | es.es_lblk = le32_to_cpu(ex->ee_block); |
| 2203 | es.es_len = ext4_ext_get_actual_len(ex); |
| 2204 | es.es_pblk = ext4_ext_pblock(ex); |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 2205 | if (ext4_ext_is_unwritten(ex)) |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2206 | flags |= FIEMAP_EXTENT_UNWRITTEN; |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2207 | } |
| 2208 | |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2209 | /* |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 2210 | * Find delayed extent and update es accordingly. We call |
| 2211 | * it even in !exists case to find out whether es is the |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2212 | * last existing extent or not. |
| 2213 | */ |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 2214 | next_del = ext4_find_delayed_extent(inode, &es); |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2215 | if (!exists && next_del) { |
| 2216 | exists = 1; |
Jie Liu | 72dac95 | 2013-06-12 23:13:59 -0400 | [diff] [blame] | 2217 | flags |= (FIEMAP_EXTENT_DELALLOC | |
| 2218 | FIEMAP_EXTENT_UNKNOWN); |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2219 | } |
| 2220 | up_read(&EXT4_I(inode)->i_data_sem); |
| 2221 | |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 2222 | if (unlikely(es.es_len == 0)) { |
| 2223 | EXT4_ERROR_INODE(inode, "es.es_len == 0"); |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 2224 | err = -EIO; |
| 2225 | break; |
| 2226 | } |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2227 | |
Zheng Liu | f7fec03 | 2013-02-18 00:28:47 -0500 | [diff] [blame] | 2228 | /* |
| 2229 | * This is possible iff next == next_del == EXT_MAX_BLOCKS. |
| 2230 | * we need to check next == EXT_MAX_BLOCKS because it is |
| 2231 | * possible that an extent is with unwritten and delayed |
| 2232 | * status due to when an extent is delayed allocated and |
| 2233 | * is allocated by fallocate status tree will track both of |
| 2234 | * them in a extent. |
| 2235 | * |
| 2236 | * So we could return a unwritten and delayed extent, and |
| 2237 | * its block is equal to 'next'. |
| 2238 | */ |
| 2239 | if (next == next_del && next == EXT_MAX_BLOCKS) { |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2240 | flags |= FIEMAP_EXTENT_LAST; |
| 2241 | if (unlikely(next_del != EXT_MAX_BLOCKS || |
| 2242 | next != EXT_MAX_BLOCKS)) { |
| 2243 | EXT4_ERROR_INODE(inode, |
| 2244 | "next extent == %u, next " |
| 2245 | "delalloc extent = %u", |
| 2246 | next, next_del); |
| 2247 | err = -EIO; |
| 2248 | break; |
| 2249 | } |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2250 | } |
| 2251 | |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2252 | if (exists) { |
| 2253 | err = fiemap_fill_next_extent(fieinfo, |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 2254 | (__u64)es.es_lblk << blksize_bits, |
| 2255 | (__u64)es.es_pblk << blksize_bits, |
| 2256 | (__u64)es.es_len << blksize_bits, |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2257 | flags); |
| 2258 | if (err < 0) |
| 2259 | break; |
| 2260 | if (err == 1) { |
| 2261 | err = 0; |
| 2262 | break; |
| 2263 | } |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2264 | } |
| 2265 | |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 2266 | block = es.es_lblk + es.es_len; |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2267 | } |
| 2268 | |
| 2269 | if (path) { |
| 2270 | ext4_ext_drop_refs(path); |
| 2271 | kfree(path); |
| 2272 | } |
| 2273 | |
| 2274 | return err; |
| 2275 | } |
| 2276 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2277 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 2278 | * ext4_ext_put_gap_in_cache: |
| 2279 | * calculate boundaries of the gap that the requested block fits into |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2280 | * and cache this gap |
| 2281 | */ |
Avantika Mathur | 09b8825 | 2006-12-06 20:41:36 -0800 | [diff] [blame] | 2282 | static void |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2283 | ext4_ext_put_gap_in_cache(struct inode *inode, struct ext4_ext_path *path, |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2284 | ext4_lblk_t block) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2285 | { |
| 2286 | int depth = ext_depth(inode); |
Andi Shyti | 27b1b22 | 2013-08-28 14:00:00 -0400 | [diff] [blame] | 2287 | unsigned long len = 0; |
| 2288 | ext4_lblk_t lblock = 0; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2289 | struct ext4_extent *ex; |
| 2290 | |
| 2291 | ex = path[depth].p_ext; |
| 2292 | if (ex == NULL) { |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 2293 | /* |
| 2294 | * there is no extent yet, so gap is [0;-] and we |
| 2295 | * don't cache it |
| 2296 | */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2297 | ext_debug("cache gap(whole file):"); |
| 2298 | } else if (block < le32_to_cpu(ex->ee_block)) { |
| 2299 | lblock = block; |
| 2300 | len = le32_to_cpu(ex->ee_block) - block; |
Eric Sandeen | bba9074 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2301 | ext_debug("cache gap(before): %u [%u:%u]", |
| 2302 | block, |
| 2303 | le32_to_cpu(ex->ee_block), |
| 2304 | ext4_ext_get_actual_len(ex)); |
Zheng Liu | d100eef | 2013-02-18 00:29:59 -0500 | [diff] [blame] | 2305 | if (!ext4_find_delalloc_range(inode, lblock, lblock + len - 1)) |
| 2306 | ext4_es_insert_extent(inode, lblock, len, ~0, |
| 2307 | EXTENT_STATUS_HOLE); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2308 | } else if (block >= le32_to_cpu(ex->ee_block) |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 2309 | + ext4_ext_get_actual_len(ex)) { |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2310 | ext4_lblk_t next; |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 2311 | lblock = le32_to_cpu(ex->ee_block) |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 2312 | + ext4_ext_get_actual_len(ex); |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2313 | |
| 2314 | next = ext4_ext_next_allocated_block(path); |
Eric Sandeen | bba9074 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2315 | ext_debug("cache gap(after): [%u:%u] %u", |
| 2316 | le32_to_cpu(ex->ee_block), |
| 2317 | ext4_ext_get_actual_len(ex), |
| 2318 | block); |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2319 | BUG_ON(next == lblock); |
| 2320 | len = next - lblock; |
Zheng Liu | d100eef | 2013-02-18 00:29:59 -0500 | [diff] [blame] | 2321 | if (!ext4_find_delalloc_range(inode, lblock, lblock + len - 1)) |
| 2322 | ext4_es_insert_extent(inode, lblock, len, ~0, |
| 2323 | EXTENT_STATUS_HOLE); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2324 | } else { |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2325 | BUG(); |
| 2326 | } |
| 2327 | |
Eric Sandeen | bba9074 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2328 | ext_debug(" -> %u:%lu\n", lblock, len); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2329 | } |
| 2330 | |
| 2331 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 2332 | * ext4_ext_rm_idx: |
| 2333 | * removes index from the index block. |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2334 | */ |
Aneesh Kumar K.V | 1d03ec9 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2335 | static int ext4_ext_rm_idx(handle_t *handle, struct inode *inode, |
Forrest Liu | c36575e | 2012-12-17 09:55:39 -0500 | [diff] [blame] | 2336 | struct ext4_ext_path *path, int depth) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2337 | { |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2338 | int err; |
Alex Tomas | f65e6fb | 2006-10-11 01:21:05 -0700 | [diff] [blame] | 2339 | ext4_fsblk_t leaf; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2340 | |
| 2341 | /* free index block */ |
Forrest Liu | c36575e | 2012-12-17 09:55:39 -0500 | [diff] [blame] | 2342 | depth--; |
| 2343 | path = path + depth; |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 2344 | leaf = ext4_idx_pblock(path->p_idx); |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 2345 | if (unlikely(path->p_hdr->eh_entries == 0)) { |
| 2346 | EXT4_ERROR_INODE(inode, "path->p_hdr->eh_entries == 0"); |
| 2347 | return -EIO; |
| 2348 | } |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 2349 | err = ext4_ext_get_access(handle, inode, path); |
| 2350 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2351 | return err; |
Robin Dong | 0e1147b | 2011-07-27 21:29:33 -0400 | [diff] [blame] | 2352 | |
| 2353 | if (path->p_idx != EXT_LAST_INDEX(path->p_hdr)) { |
| 2354 | int len = EXT_LAST_INDEX(path->p_hdr) - path->p_idx; |
| 2355 | len *= sizeof(struct ext4_extent_idx); |
| 2356 | memmove(path->p_idx, path->p_idx + 1, len); |
| 2357 | } |
| 2358 | |
Marcin Slusarz | e8546d0 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 2359 | le16_add_cpu(&path->p_hdr->eh_entries, -1); |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 2360 | err = ext4_ext_dirty(handle, inode, path); |
| 2361 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2362 | return err; |
Mingming Cao | 2ae0210 | 2006-10-11 01:21:11 -0700 | [diff] [blame] | 2363 | ext_debug("index is empty, remove it, free block %llu\n", leaf); |
Aditya Kali | d899024 | 2011-09-09 19:18:51 -0400 | [diff] [blame] | 2364 | trace_ext4_ext_rm_idx(inode, leaf); |
| 2365 | |
Peter Huewe | 7dc5761 | 2011-02-21 21:01:42 -0500 | [diff] [blame] | 2366 | ext4_free_blocks(handle, inode, NULL, leaf, 1, |
Theodore Ts'o | e636260 | 2009-11-23 07:17:05 -0500 | [diff] [blame] | 2367 | EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET); |
Forrest Liu | c36575e | 2012-12-17 09:55:39 -0500 | [diff] [blame] | 2368 | |
| 2369 | while (--depth >= 0) { |
| 2370 | if (path->p_idx != EXT_FIRST_INDEX(path->p_hdr)) |
| 2371 | break; |
| 2372 | path--; |
| 2373 | err = ext4_ext_get_access(handle, inode, path); |
| 2374 | if (err) |
| 2375 | break; |
| 2376 | path->p_idx->ei_block = (path+1)->p_idx->ei_block; |
| 2377 | err = ext4_ext_dirty(handle, inode, path); |
| 2378 | if (err) |
| 2379 | break; |
| 2380 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2381 | return err; |
| 2382 | } |
| 2383 | |
| 2384 | /* |
Mingming Cao | ee12b63 | 2008-08-19 22:16:05 -0400 | [diff] [blame] | 2385 | * ext4_ext_calc_credits_for_single_extent: |
| 2386 | * This routine returns max. credits that needed to insert an extent |
| 2387 | * to the extent tree. |
| 2388 | * When pass the actual path, the caller should calculate credits |
| 2389 | * under i_data_sem. |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2390 | */ |
Mingming Cao | 525f4ed | 2008-08-19 22:15:58 -0400 | [diff] [blame] | 2391 | int ext4_ext_calc_credits_for_single_extent(struct inode *inode, int nrblocks, |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2392 | struct ext4_ext_path *path) |
| 2393 | { |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2394 | if (path) { |
Mingming Cao | ee12b63 | 2008-08-19 22:16:05 -0400 | [diff] [blame] | 2395 | int depth = ext_depth(inode); |
Mingming Cao | f3bd1f3 | 2008-08-19 22:16:03 -0400 | [diff] [blame] | 2396 | int ret = 0; |
Mingming Cao | ee12b63 | 2008-08-19 22:16:05 -0400 | [diff] [blame] | 2397 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2398 | /* probably there is space in leaf? */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2399 | if (le16_to_cpu(path[depth].p_hdr->eh_entries) |
Mingming Cao | ee12b63 | 2008-08-19 22:16:05 -0400 | [diff] [blame] | 2400 | < le16_to_cpu(path[depth].p_hdr->eh_max)) { |
| 2401 | |
| 2402 | /* |
| 2403 | * There are some space in the leaf tree, no |
| 2404 | * need to account for leaf block credit |
| 2405 | * |
| 2406 | * bitmaps and block group descriptor blocks |
Tao Ma | df3ab17 | 2011-10-08 15:53:49 -0400 | [diff] [blame] | 2407 | * and other metadata blocks still need to be |
Mingming Cao | ee12b63 | 2008-08-19 22:16:05 -0400 | [diff] [blame] | 2408 | * accounted. |
| 2409 | */ |
Mingming Cao | 525f4ed | 2008-08-19 22:15:58 -0400 | [diff] [blame] | 2410 | /* 1 bitmap, 1 block group descriptor */ |
Mingming Cao | ee12b63 | 2008-08-19 22:16:05 -0400 | [diff] [blame] | 2411 | ret = 2 + EXT4_META_TRANS_BLOCKS(inode->i_sb); |
Aneesh Kumar K.V | 5887e98 | 2009-07-05 23:12:04 -0400 | [diff] [blame] | 2412 | return ret; |
Mingming Cao | ee12b63 | 2008-08-19 22:16:05 -0400 | [diff] [blame] | 2413 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2414 | } |
| 2415 | |
Mingming Cao | 525f4ed | 2008-08-19 22:15:58 -0400 | [diff] [blame] | 2416 | return ext4_chunk_trans_blocks(inode, nrblocks); |
Mingming Cao | ee12b63 | 2008-08-19 22:16:05 -0400 | [diff] [blame] | 2417 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2418 | |
Mingming Cao | ee12b63 | 2008-08-19 22:16:05 -0400 | [diff] [blame] | 2419 | /* |
Jan Kara | fffb273 | 2013-06-04 13:01:11 -0400 | [diff] [blame] | 2420 | * How many index/leaf blocks need to change/allocate to add @extents extents? |
Mingming Cao | ee12b63 | 2008-08-19 22:16:05 -0400 | [diff] [blame] | 2421 | * |
Jan Kara | fffb273 | 2013-06-04 13:01:11 -0400 | [diff] [blame] | 2422 | * If we add a single extent, then in the worse case, each tree level |
| 2423 | * index/leaf need to be changed in case of the tree split. |
Mingming Cao | ee12b63 | 2008-08-19 22:16:05 -0400 | [diff] [blame] | 2424 | * |
Jan Kara | fffb273 | 2013-06-04 13:01:11 -0400 | [diff] [blame] | 2425 | * If more extents are inserted, they could cause the whole tree split more |
| 2426 | * than once, but this is really rare. |
Mingming Cao | ee12b63 | 2008-08-19 22:16:05 -0400 | [diff] [blame] | 2427 | */ |
Jan Kara | fffb273 | 2013-06-04 13:01:11 -0400 | [diff] [blame] | 2428 | int ext4_ext_index_trans_blocks(struct inode *inode, int extents) |
Mingming Cao | ee12b63 | 2008-08-19 22:16:05 -0400 | [diff] [blame] | 2429 | { |
| 2430 | int index; |
Tao Ma | f19d587 | 2012-12-10 14:05:51 -0500 | [diff] [blame] | 2431 | int depth; |
| 2432 | |
| 2433 | /* If we are converting the inline data, only one is needed here. */ |
| 2434 | if (ext4_has_inline_data(inode)) |
| 2435 | return 1; |
| 2436 | |
| 2437 | depth = ext_depth(inode); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2438 | |
Jan Kara | fffb273 | 2013-06-04 13:01:11 -0400 | [diff] [blame] | 2439 | if (extents <= 1) |
Mingming Cao | ee12b63 | 2008-08-19 22:16:05 -0400 | [diff] [blame] | 2440 | index = depth * 2; |
| 2441 | else |
| 2442 | index = depth * 3; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2443 | |
Mingming Cao | ee12b63 | 2008-08-19 22:16:05 -0400 | [diff] [blame] | 2444 | return index; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2445 | } |
| 2446 | |
Theodore Ts'o | 981250c | 2013-06-12 11:48:29 -0400 | [diff] [blame] | 2447 | static inline int get_default_free_blocks_flags(struct inode *inode) |
| 2448 | { |
| 2449 | if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) |
| 2450 | return EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET; |
| 2451 | else if (ext4_should_journal_data(inode)) |
| 2452 | return EXT4_FREE_BLOCKS_FORGET; |
| 2453 | return 0; |
| 2454 | } |
| 2455 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2456 | static int ext4_remove_blocks(handle_t *handle, struct inode *inode, |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2457 | struct ext4_extent *ex, |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2458 | long long *partial_cluster, |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2459 | ext4_lblk_t from, ext4_lblk_t to) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2460 | { |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2461 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 2462 | unsigned short ee_len = ext4_ext_get_actual_len(ex); |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2463 | ext4_fsblk_t pblk; |
Theodore Ts'o | 981250c | 2013-06-12 11:48:29 -0400 | [diff] [blame] | 2464 | int flags = get_default_free_blocks_flags(inode); |
Andrey Sidorov | 18888cf | 2012-09-19 14:14:53 -0400 | [diff] [blame] | 2465 | |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2466 | /* |
| 2467 | * For bigalloc file systems, we never free a partial cluster |
| 2468 | * at the beginning of the extent. Instead, we make a note |
| 2469 | * that we tried freeing the cluster, and check to see if we |
| 2470 | * need to free it on a subsequent call to ext4_remove_blocks, |
| 2471 | * or at the end of the ext4_truncate() operation. |
| 2472 | */ |
| 2473 | flags |= EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER; |
| 2474 | |
Aditya Kali | d899024 | 2011-09-09 19:18:51 -0400 | [diff] [blame] | 2475 | trace_ext4_remove_blocks(inode, ex, from, to, *partial_cluster); |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2476 | /* |
| 2477 | * If we have a partial cluster, and it's different from the |
| 2478 | * cluster of the last block, we need to explicitly free the |
| 2479 | * partial cluster here. |
| 2480 | */ |
| 2481 | pblk = ext4_ext_pblock(ex) + ee_len - 1; |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2482 | if ((*partial_cluster > 0) && |
| 2483 | (EXT4_B2C(sbi, pblk) != *partial_cluster)) { |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2484 | ext4_free_blocks(handle, inode, NULL, |
| 2485 | EXT4_C2B(sbi, *partial_cluster), |
| 2486 | sbi->s_cluster_ratio, flags); |
| 2487 | *partial_cluster = 0; |
| 2488 | } |
| 2489 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2490 | #ifdef EXTENTS_STATS |
| 2491 | { |
| 2492 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2493 | spin_lock(&sbi->s_ext_stats_lock); |
| 2494 | sbi->s_ext_blocks += ee_len; |
| 2495 | sbi->s_ext_extents++; |
| 2496 | if (ee_len < sbi->s_ext_min) |
| 2497 | sbi->s_ext_min = ee_len; |
| 2498 | if (ee_len > sbi->s_ext_max) |
| 2499 | sbi->s_ext_max = ee_len; |
| 2500 | if (ext_depth(inode) > sbi->s_depth_max) |
| 2501 | sbi->s_depth_max = ext_depth(inode); |
| 2502 | spin_unlock(&sbi->s_ext_stats_lock); |
| 2503 | } |
| 2504 | #endif |
| 2505 | if (from >= le32_to_cpu(ex->ee_block) |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 2506 | && to == le32_to_cpu(ex->ee_block) + ee_len - 1) { |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2507 | /* tail removal */ |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2508 | ext4_lblk_t num; |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2509 | unsigned int unaligned; |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2510 | |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 2511 | num = le32_to_cpu(ex->ee_block) + ee_len - from; |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2512 | pblk = ext4_ext_pblock(ex) + ee_len - num; |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2513 | /* |
| 2514 | * Usually we want to free partial cluster at the end of the |
| 2515 | * extent, except for the situation when the cluster is still |
| 2516 | * used by any other extent (partial_cluster is negative). |
| 2517 | */ |
| 2518 | if (*partial_cluster < 0 && |
| 2519 | -(*partial_cluster) == EXT4_B2C(sbi, pblk + num - 1)) |
| 2520 | flags |= EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER; |
| 2521 | |
| 2522 | ext_debug("free last %u blocks starting %llu partial %lld\n", |
| 2523 | num, pblk, *partial_cluster); |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2524 | ext4_free_blocks(handle, inode, NULL, pblk, num, flags); |
| 2525 | /* |
| 2526 | * If the block range to be freed didn't start at the |
| 2527 | * beginning of a cluster, and we removed the entire |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2528 | * extent and the cluster is not used by any other extent, |
| 2529 | * save the partial cluster here, since we might need to |
| 2530 | * delete if we determine that the truncate operation has |
| 2531 | * removed all of the blocks in the cluster. |
| 2532 | * |
| 2533 | * On the other hand, if we did not manage to free the whole |
| 2534 | * extent, we have to mark the cluster as used (store negative |
| 2535 | * cluster number in partial_cluster). |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2536 | */ |
Theodore Ts'o | f5a44db | 2013-12-20 09:29:35 -0500 | [diff] [blame] | 2537 | unaligned = EXT4_PBLK_COFF(sbi, pblk); |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2538 | if (unaligned && (ee_len == num) && |
| 2539 | (*partial_cluster != -((long long)EXT4_B2C(sbi, pblk)))) |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2540 | *partial_cluster = EXT4_B2C(sbi, pblk); |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2541 | else if (unaligned) |
| 2542 | *partial_cluster = -((long long)EXT4_B2C(sbi, pblk)); |
| 2543 | else if (*partial_cluster > 0) |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2544 | *partial_cluster = 0; |
Lukas Czerner | 78fb9cd | 2013-05-27 23:32:35 -0400 | [diff] [blame] | 2545 | } else |
| 2546 | ext4_error(sbi->s_sb, "strange request: removal(2) " |
| 2547 | "%u-%u from %u:%u\n", |
| 2548 | from, to, le32_to_cpu(ex->ee_block), ee_len); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2549 | return 0; |
| 2550 | } |
| 2551 | |
Allison Henderson | d583fb8 | 2011-05-25 07:41:43 -0400 | [diff] [blame] | 2552 | |
| 2553 | /* |
| 2554 | * ext4_ext_rm_leaf() Removes the extents associated with the |
| 2555 | * blocks appearing between "start" and "end", and splits the extents |
| 2556 | * if "start" and "end" appear in the same extent |
| 2557 | * |
| 2558 | * @handle: The journal handle |
| 2559 | * @inode: The files inode |
| 2560 | * @path: The path to the leaf |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2561 | * @partial_cluster: The cluster which we'll have to free if all extents |
| 2562 | * has been released from it. It gets negative in case |
| 2563 | * that the cluster is still used. |
Allison Henderson | d583fb8 | 2011-05-25 07:41:43 -0400 | [diff] [blame] | 2564 | * @start: The first block to remove |
| 2565 | * @end: The last block to remove |
| 2566 | */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2567 | static int |
| 2568 | ext4_ext_rm_leaf(handle_t *handle, struct inode *inode, |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2569 | struct ext4_ext_path *path, |
| 2570 | long long *partial_cluster, |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2571 | ext4_lblk_t start, ext4_lblk_t end) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2572 | { |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2573 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2574 | int err = 0, correct_index = 0; |
| 2575 | int depth = ext_depth(inode), credits; |
| 2576 | struct ext4_extent_header *eh; |
Dmitry Monakhov | 750c9c4 | 2011-10-25 05:35:05 -0400 | [diff] [blame] | 2577 | ext4_lblk_t a, b; |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2578 | unsigned num; |
| 2579 | ext4_lblk_t ex_ee_block; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2580 | unsigned short ex_ee_len; |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 2581 | unsigned unwritten = 0; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2582 | struct ext4_extent *ex; |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2583 | ext4_fsblk_t pblk; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2584 | |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 2585 | /* the header must be checked already in ext4_ext_remove_space() */ |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 2586 | ext_debug("truncate since %u in leaf to %u\n", start, end); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2587 | if (!path[depth].p_hdr) |
| 2588 | path[depth].p_hdr = ext_block_hdr(path[depth].p_bh); |
| 2589 | eh = path[depth].p_hdr; |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 2590 | if (unlikely(path[depth].p_hdr == NULL)) { |
| 2591 | EXT4_ERROR_INODE(inode, "path[%d].p_hdr == NULL", depth); |
| 2592 | return -EIO; |
| 2593 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2594 | /* find where to start removing */ |
Ashish Sangwan | 6ae06ff | 2013-07-01 08:12:41 -0400 | [diff] [blame] | 2595 | ex = path[depth].p_ext; |
| 2596 | if (!ex) |
| 2597 | ex = EXT_LAST_EXTENT(eh); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2598 | |
| 2599 | ex_ee_block = le32_to_cpu(ex->ee_block); |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 2600 | ex_ee_len = ext4_ext_get_actual_len(ex); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2601 | |
Eric Whitney | c063449 | 2014-03-13 23:34:16 -0400 | [diff] [blame] | 2602 | /* |
| 2603 | * If we're starting with an extent other than the last one in the |
| 2604 | * node, we need to see if it shares a cluster with the extent to |
| 2605 | * the right (towards the end of the file). If its leftmost cluster |
| 2606 | * is this extent's rightmost cluster and it is not cluster aligned, |
| 2607 | * we'll mark it as a partial that is not to be deallocated. |
| 2608 | */ |
| 2609 | |
| 2610 | if (ex != EXT_LAST_EXTENT(eh)) { |
| 2611 | ext4_fsblk_t current_pblk, right_pblk; |
| 2612 | long long current_cluster, right_cluster; |
| 2613 | |
| 2614 | current_pblk = ext4_ext_pblock(ex) + ex_ee_len - 1; |
| 2615 | current_cluster = (long long)EXT4_B2C(sbi, current_pblk); |
| 2616 | right_pblk = ext4_ext_pblock(ex + 1); |
| 2617 | right_cluster = (long long)EXT4_B2C(sbi, right_pblk); |
| 2618 | if (current_cluster == right_cluster && |
| 2619 | EXT4_PBLK_COFF(sbi, right_pblk)) |
| 2620 | *partial_cluster = -right_cluster; |
| 2621 | } |
| 2622 | |
Aditya Kali | d899024 | 2011-09-09 19:18:51 -0400 | [diff] [blame] | 2623 | trace_ext4_ext_rm_leaf(inode, start, ex, *partial_cluster); |
| 2624 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2625 | while (ex >= EXT_FIRST_EXTENT(eh) && |
| 2626 | ex_ee_block + ex_ee_len > start) { |
Aneesh Kumar K.V | a41f207 | 2009-06-10 14:22:55 -0400 | [diff] [blame] | 2627 | |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 2628 | if (ext4_ext_is_unwritten(ex)) |
| 2629 | unwritten = 1; |
Aneesh Kumar K.V | a41f207 | 2009-06-10 14:22:55 -0400 | [diff] [blame] | 2630 | else |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 2631 | unwritten = 0; |
Aneesh Kumar K.V | a41f207 | 2009-06-10 14:22:55 -0400 | [diff] [blame] | 2632 | |
Mingming | 553f900 | 2009-09-18 13:34:55 -0400 | [diff] [blame] | 2633 | ext_debug("remove ext %u:[%d]%d\n", ex_ee_block, |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 2634 | unwritten, ex_ee_len); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2635 | path[depth].p_ext = ex; |
| 2636 | |
| 2637 | a = ex_ee_block > start ? ex_ee_block : start; |
Allison Henderson | d583fb8 | 2011-05-25 07:41:43 -0400 | [diff] [blame] | 2638 | b = ex_ee_block+ex_ee_len - 1 < end ? |
| 2639 | ex_ee_block+ex_ee_len - 1 : end; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2640 | |
| 2641 | ext_debug(" border %u:%u\n", a, b); |
| 2642 | |
Allison Henderson | d583fb8 | 2011-05-25 07:41:43 -0400 | [diff] [blame] | 2643 | /* If this extent is beyond the end of the hole, skip it */ |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 2644 | if (end < ex_ee_block) { |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2645 | /* |
| 2646 | * We're going to skip this extent and move to another, |
| 2647 | * so if this extent is not cluster aligned we have |
| 2648 | * to mark the current cluster as used to avoid |
| 2649 | * accidentally freeing it later on |
| 2650 | */ |
| 2651 | pblk = ext4_ext_pblock(ex); |
Theodore Ts'o | f5a44db | 2013-12-20 09:29:35 -0500 | [diff] [blame] | 2652 | if (EXT4_PBLK_COFF(sbi, pblk)) |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2653 | *partial_cluster = |
| 2654 | -((long long)EXT4_B2C(sbi, pblk)); |
Allison Henderson | d583fb8 | 2011-05-25 07:41:43 -0400 | [diff] [blame] | 2655 | ex--; |
| 2656 | ex_ee_block = le32_to_cpu(ex->ee_block); |
| 2657 | ex_ee_len = ext4_ext_get_actual_len(ex); |
| 2658 | continue; |
Dmitry Monakhov | 750c9c4 | 2011-10-25 05:35:05 -0400 | [diff] [blame] | 2659 | } else if (b != ex_ee_block + ex_ee_len - 1) { |
Lukas Czerner | dc1841d | 2012-03-19 23:07:43 -0400 | [diff] [blame] | 2660 | EXT4_ERROR_INODE(inode, |
| 2661 | "can not handle truncate %u:%u " |
| 2662 | "on extent %u:%u", |
| 2663 | start, end, ex_ee_block, |
| 2664 | ex_ee_block + ex_ee_len - 1); |
Dmitry Monakhov | 750c9c4 | 2011-10-25 05:35:05 -0400 | [diff] [blame] | 2665 | err = -EIO; |
| 2666 | goto out; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2667 | } else if (a != ex_ee_block) { |
| 2668 | /* remove tail of the extent */ |
Dmitry Monakhov | 750c9c4 | 2011-10-25 05:35:05 -0400 | [diff] [blame] | 2669 | num = a - ex_ee_block; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2670 | } else { |
| 2671 | /* remove whole extent: excellent! */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2672 | num = 0; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2673 | } |
Theodore Ts'o | 34071da | 2008-08-01 21:59:19 -0400 | [diff] [blame] | 2674 | /* |
| 2675 | * 3 for leaf, sb, and inode plus 2 (bmap and group |
| 2676 | * descriptor) for each block group; assume two block |
| 2677 | * groups plus ex_ee_len/blocks_per_block_group for |
| 2678 | * the worst case |
| 2679 | */ |
| 2680 | credits = 7 + 2*(ex_ee_len/EXT4_BLOCKS_PER_GROUP(inode->i_sb)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2681 | if (ex == EXT_FIRST_EXTENT(eh)) { |
| 2682 | correct_index = 1; |
| 2683 | credits += (ext_depth(inode)) + 1; |
| 2684 | } |
Dmitry Monakhov | 5aca07e | 2009-12-08 22:42:15 -0500 | [diff] [blame] | 2685 | credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2686 | |
Jan Kara | 487caee | 2009-08-17 22:17:20 -0400 | [diff] [blame] | 2687 | err = ext4_ext_truncate_extend_restart(handle, inode, credits); |
Shen Feng | 9102e4f | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2688 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2689 | goto out; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2690 | |
| 2691 | err = ext4_ext_get_access(handle, inode, path + depth); |
| 2692 | if (err) |
| 2693 | goto out; |
| 2694 | |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2695 | err = ext4_remove_blocks(handle, inode, ex, partial_cluster, |
| 2696 | a, b); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2697 | if (err) |
| 2698 | goto out; |
| 2699 | |
Dmitry Monakhov | 750c9c4 | 2011-10-25 05:35:05 -0400 | [diff] [blame] | 2700 | if (num == 0) |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 2701 | /* this extent is removed; mark slot entirely unused */ |
Alex Tomas | f65e6fb | 2006-10-11 01:21:05 -0700 | [diff] [blame] | 2702 | ext4_ext_store_pblock(ex, 0); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2703 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2704 | ex->ee_len = cpu_to_le16(num); |
Amit Arora | 749269f | 2007-07-18 09:02:56 -0400 | [diff] [blame] | 2705 | /* |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 2706 | * Do not mark unwritten if all the blocks in the |
Amit Arora | 749269f | 2007-07-18 09:02:56 -0400 | [diff] [blame] | 2707 | * extent have been removed. |
| 2708 | */ |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 2709 | if (unwritten && num) |
| 2710 | ext4_ext_mark_unwritten(ex); |
Allison Henderson | d583fb8 | 2011-05-25 07:41:43 -0400 | [diff] [blame] | 2711 | /* |
| 2712 | * If the extent was completely released, |
| 2713 | * we need to remove it from the leaf |
| 2714 | */ |
| 2715 | if (num == 0) { |
Lukas Czerner | f17722f | 2011-06-06 00:05:17 -0400 | [diff] [blame] | 2716 | if (end != EXT_MAX_BLOCKS - 1) { |
Allison Henderson | d583fb8 | 2011-05-25 07:41:43 -0400 | [diff] [blame] | 2717 | /* |
| 2718 | * For hole punching, we need to scoot all the |
| 2719 | * extents up when an extent is removed so that |
| 2720 | * we dont have blank extents in the middle |
| 2721 | */ |
| 2722 | memmove(ex, ex+1, (EXT_LAST_EXTENT(eh) - ex) * |
| 2723 | sizeof(struct ext4_extent)); |
| 2724 | |
| 2725 | /* Now get rid of the one at the end */ |
| 2726 | memset(EXT_LAST_EXTENT(eh), 0, |
| 2727 | sizeof(struct ext4_extent)); |
| 2728 | } |
| 2729 | le16_add_cpu(&eh->eh_entries, -1); |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2730 | } else if (*partial_cluster > 0) |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2731 | *partial_cluster = 0; |
Allison Henderson | d583fb8 | 2011-05-25 07:41:43 -0400 | [diff] [blame] | 2732 | |
Dmitry Monakhov | 750c9c4 | 2011-10-25 05:35:05 -0400 | [diff] [blame] | 2733 | err = ext4_ext_dirty(handle, inode, path + depth); |
| 2734 | if (err) |
| 2735 | goto out; |
| 2736 | |
Yongqiang Yang | bf52c6f | 2011-11-01 18:59:26 -0400 | [diff] [blame] | 2737 | ext_debug("new extent: %u:%u:%llu\n", ex_ee_block, num, |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 2738 | ext4_ext_pblock(ex)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2739 | ex--; |
| 2740 | ex_ee_block = le32_to_cpu(ex->ee_block); |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 2741 | ex_ee_len = ext4_ext_get_actual_len(ex); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2742 | } |
| 2743 | |
| 2744 | if (correct_index && eh->eh_entries) |
| 2745 | err = ext4_ext_correct_indexes(handle, inode, path); |
| 2746 | |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2747 | /* |
Eric Whitney | ad6599a | 2014-04-01 19:49:30 -0400 | [diff] [blame] | 2748 | * If there's a partial cluster and at least one extent remains in |
| 2749 | * the leaf, free the partial cluster if it isn't shared with the |
| 2750 | * current extent. If there's a partial cluster and no extents |
| 2751 | * remain in the leaf, it can't be freed here. It can only be |
| 2752 | * freed when it's possible to determine if it's not shared with |
| 2753 | * any other extent - when the next leaf is processed or when space |
| 2754 | * removal is complete. |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2755 | */ |
Eric Whitney | ad6599a | 2014-04-01 19:49:30 -0400 | [diff] [blame] | 2756 | if (*partial_cluster > 0 && eh->eh_entries && |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2757 | (EXT4_B2C(sbi, ext4_ext_pblock(ex) + ex_ee_len - 1) != |
| 2758 | *partial_cluster)) { |
Theodore Ts'o | 981250c | 2013-06-12 11:48:29 -0400 | [diff] [blame] | 2759 | int flags = get_default_free_blocks_flags(inode); |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2760 | |
| 2761 | ext4_free_blocks(handle, inode, NULL, |
| 2762 | EXT4_C2B(sbi, *partial_cluster), |
| 2763 | sbi->s_cluster_ratio, flags); |
| 2764 | *partial_cluster = 0; |
| 2765 | } |
| 2766 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2767 | /* if this leaf is free, then we should |
| 2768 | * remove it from index block above */ |
| 2769 | if (err == 0 && eh->eh_entries == 0 && path[depth].p_bh != NULL) |
Forrest Liu | c36575e | 2012-12-17 09:55:39 -0500 | [diff] [blame] | 2770 | err = ext4_ext_rm_idx(handle, inode, path, depth); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2771 | |
| 2772 | out: |
| 2773 | return err; |
| 2774 | } |
| 2775 | |
| 2776 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 2777 | * ext4_ext_more_to_rm: |
| 2778 | * returns 1 if current index has to be freed (even partial) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2779 | */ |
Avantika Mathur | 09b8825 | 2006-12-06 20:41:36 -0800 | [diff] [blame] | 2780 | static int |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2781 | ext4_ext_more_to_rm(struct ext4_ext_path *path) |
| 2782 | { |
| 2783 | BUG_ON(path->p_idx == NULL); |
| 2784 | |
| 2785 | if (path->p_idx < EXT_FIRST_INDEX(path->p_hdr)) |
| 2786 | return 0; |
| 2787 | |
| 2788 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 2789 | * if truncate on deeper level happened, it wasn't partial, |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2790 | * so we have to consider current index for truncation |
| 2791 | */ |
| 2792 | if (le16_to_cpu(path->p_hdr->eh_entries) == path->p_block) |
| 2793 | return 0; |
| 2794 | return 1; |
| 2795 | } |
| 2796 | |
Theodore Ts'o | 26a4c0c | 2013-04-03 12:45:17 -0400 | [diff] [blame] | 2797 | int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, |
| 2798 | ext4_lblk_t end) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2799 | { |
| 2800 | struct super_block *sb = inode->i_sb; |
| 2801 | int depth = ext_depth(inode); |
Ashish Sangwan | 968dee7 | 2012-07-22 22:49:08 -0400 | [diff] [blame] | 2802 | struct ext4_ext_path *path = NULL; |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2803 | long long partial_cluster = 0; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2804 | handle_t *handle; |
Dmitry Monakhov | 6f2080e | 2012-09-30 23:03:50 -0400 | [diff] [blame] | 2805 | int i = 0, err = 0; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2806 | |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 2807 | ext_debug("truncate since %u to %u\n", start, end); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2808 | |
| 2809 | /* probably first extent we're gonna free will be last in block */ |
Theodore Ts'o | 9924a92 | 2013-02-08 21:59:22 -0500 | [diff] [blame] | 2810 | handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE, depth + 1); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2811 | if (IS_ERR(handle)) |
| 2812 | return PTR_ERR(handle); |
| 2813 | |
Dmitry Monakhov | 0617b83 | 2010-05-17 01:00:00 -0400 | [diff] [blame] | 2814 | again: |
Lukas Czerner | 6180132 | 2013-05-27 23:32:35 -0400 | [diff] [blame] | 2815 | trace_ext4_ext_remove_space(inode, start, end, depth); |
Aditya Kali | d899024 | 2011-09-09 19:18:51 -0400 | [diff] [blame] | 2816 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2817 | /* |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 2818 | * Check if we are removing extents inside the extent tree. If that |
| 2819 | * is the case, we are going to punch a hole inside the extent tree |
| 2820 | * so we have to check whether we need to split the extent covering |
| 2821 | * the last block to remove so we can easily remove the part of it |
| 2822 | * in ext4_ext_rm_leaf(). |
| 2823 | */ |
| 2824 | if (end < EXT_MAX_BLOCKS - 1) { |
| 2825 | struct ext4_extent *ex; |
| 2826 | ext4_lblk_t ee_block; |
| 2827 | |
| 2828 | /* find extent for this block */ |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 2829 | path = ext4_ext_find_extent(inode, end, NULL, EXT4_EX_NOCACHE); |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 2830 | if (IS_ERR(path)) { |
| 2831 | ext4_journal_stop(handle); |
| 2832 | return PTR_ERR(path); |
| 2833 | } |
| 2834 | depth = ext_depth(inode); |
Dmitry Monakhov | 6f2080e | 2012-09-30 23:03:50 -0400 | [diff] [blame] | 2835 | /* Leaf not may not exist only if inode has no blocks at all */ |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 2836 | ex = path[depth].p_ext; |
Ashish Sangwan | 968dee7 | 2012-07-22 22:49:08 -0400 | [diff] [blame] | 2837 | if (!ex) { |
Dmitry Monakhov | 6f2080e | 2012-09-30 23:03:50 -0400 | [diff] [blame] | 2838 | if (depth) { |
| 2839 | EXT4_ERROR_INODE(inode, |
| 2840 | "path[%d].p_hdr == NULL", |
| 2841 | depth); |
| 2842 | err = -EIO; |
| 2843 | } |
| 2844 | goto out; |
Ashish Sangwan | 968dee7 | 2012-07-22 22:49:08 -0400 | [diff] [blame] | 2845 | } |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 2846 | |
| 2847 | ee_block = le32_to_cpu(ex->ee_block); |
| 2848 | |
| 2849 | /* |
| 2850 | * See if the last block is inside the extent, if so split |
| 2851 | * the extent at 'end' block so we can easily remove the |
| 2852 | * tail of the first part of the split extent in |
| 2853 | * ext4_ext_rm_leaf(). |
| 2854 | */ |
| 2855 | if (end >= ee_block && |
| 2856 | end < ee_block + ext4_ext_get_actual_len(ex) - 1) { |
| 2857 | int split_flag = 0; |
| 2858 | |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 2859 | if (ext4_ext_is_unwritten(ex)) |
| 2860 | split_flag = EXT4_EXT_MARK_UNWRIT1 | |
| 2861 | EXT4_EXT_MARK_UNWRIT2; |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 2862 | |
| 2863 | /* |
| 2864 | * Split the extent in two so that 'end' is the last |
Lukas Czerner | 27dd438 | 2013-04-09 22:11:22 -0400 | [diff] [blame] | 2865 | * block in the first new extent. Also we should not |
| 2866 | * fail removing space due to ENOSPC so try to use |
| 2867 | * reserved block if that happens. |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 2868 | */ |
| 2869 | err = ext4_split_extent_at(handle, inode, path, |
Lukas Czerner | 27dd438 | 2013-04-09 22:11:22 -0400 | [diff] [blame] | 2870 | end + 1, split_flag, |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 2871 | EXT4_EX_NOCACHE | |
Lukas Czerner | 27dd438 | 2013-04-09 22:11:22 -0400 | [diff] [blame] | 2872 | EXT4_GET_BLOCKS_PRE_IO | |
| 2873 | EXT4_GET_BLOCKS_METADATA_NOFAIL); |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 2874 | |
| 2875 | if (err < 0) |
| 2876 | goto out; |
| 2877 | } |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 2878 | } |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 2879 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 2880 | * We start scanning from right side, freeing all the blocks |
| 2881 | * after i_size and walking into the tree depth-wise. |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2882 | */ |
Dmitry Monakhov | 0617b83 | 2010-05-17 01:00:00 -0400 | [diff] [blame] | 2883 | depth = ext_depth(inode); |
Ashish Sangwan | 968dee7 | 2012-07-22 22:49:08 -0400 | [diff] [blame] | 2884 | if (path) { |
| 2885 | int k = i = depth; |
| 2886 | while (--k > 0) |
| 2887 | path[k].p_block = |
| 2888 | le16_to_cpu(path[k].p_hdr->eh_entries)+1; |
| 2889 | } else { |
| 2890 | path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 1), |
| 2891 | GFP_NOFS); |
| 2892 | if (path == NULL) { |
| 2893 | ext4_journal_stop(handle); |
| 2894 | return -ENOMEM; |
| 2895 | } |
| 2896 | path[0].p_depth = depth; |
| 2897 | path[0].p_hdr = ext_inode_hdr(inode); |
Theodore Ts'o | 89a4e48 | 2012-08-17 08:54:52 -0400 | [diff] [blame] | 2898 | i = 0; |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 2899 | |
Theodore Ts'o | c349179 | 2013-08-16 21:21:41 -0400 | [diff] [blame] | 2900 | if (ext4_ext_check(inode, path[0].p_hdr, depth, 0)) { |
Ashish Sangwan | 968dee7 | 2012-07-22 22:49:08 -0400 | [diff] [blame] | 2901 | err = -EIO; |
| 2902 | goto out; |
| 2903 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2904 | } |
Ashish Sangwan | 968dee7 | 2012-07-22 22:49:08 -0400 | [diff] [blame] | 2905 | err = 0; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2906 | |
| 2907 | while (i >= 0 && err == 0) { |
| 2908 | if (i == depth) { |
| 2909 | /* this is leaf block */ |
Allison Henderson | d583fb8 | 2011-05-25 07:41:43 -0400 | [diff] [blame] | 2910 | err = ext4_ext_rm_leaf(handle, inode, path, |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2911 | &partial_cluster, start, |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 2912 | end); |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 2913 | /* root level has p_bh == NULL, brelse() eats this */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2914 | brelse(path[i].p_bh); |
| 2915 | path[i].p_bh = NULL; |
| 2916 | i--; |
| 2917 | continue; |
| 2918 | } |
| 2919 | |
| 2920 | /* this is index block */ |
| 2921 | if (!path[i].p_hdr) { |
| 2922 | ext_debug("initialize header\n"); |
| 2923 | path[i].p_hdr = ext_block_hdr(path[i].p_bh); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2924 | } |
| 2925 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2926 | if (!path[i].p_idx) { |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 2927 | /* this level hasn't been touched yet */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2928 | path[i].p_idx = EXT_LAST_INDEX(path[i].p_hdr); |
| 2929 | path[i].p_block = le16_to_cpu(path[i].p_hdr->eh_entries)+1; |
| 2930 | ext_debug("init index ptr: hdr 0x%p, num %d\n", |
| 2931 | path[i].p_hdr, |
| 2932 | le16_to_cpu(path[i].p_hdr->eh_entries)); |
| 2933 | } else { |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 2934 | /* we were already here, see at next index */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2935 | path[i].p_idx--; |
| 2936 | } |
| 2937 | |
| 2938 | ext_debug("level %d - index, first 0x%p, cur 0x%p\n", |
| 2939 | i, EXT_FIRST_INDEX(path[i].p_hdr), |
| 2940 | path[i].p_idx); |
| 2941 | if (ext4_ext_more_to_rm(path + i)) { |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 2942 | struct buffer_head *bh; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2943 | /* go to the next level */ |
Mingming Cao | 2ae0210 | 2006-10-11 01:21:11 -0700 | [diff] [blame] | 2944 | ext_debug("move to level %d (block %llu)\n", |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 2945 | i + 1, ext4_idx_pblock(path[i].p_idx)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2946 | memset(path + i + 1, 0, sizeof(*path)); |
Theodore Ts'o | 7d7ea89 | 2013-08-16 21:20:41 -0400 | [diff] [blame] | 2947 | bh = read_extent_tree_block(inode, |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 2948 | ext4_idx_pblock(path[i].p_idx), depth - i - 1, |
| 2949 | EXT4_EX_NOCACHE); |
Theodore Ts'o | 7d7ea89 | 2013-08-16 21:20:41 -0400 | [diff] [blame] | 2950 | if (IS_ERR(bh)) { |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2951 | /* should we reset i_size? */ |
Theodore Ts'o | 7d7ea89 | 2013-08-16 21:20:41 -0400 | [diff] [blame] | 2952 | err = PTR_ERR(bh); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2953 | break; |
| 2954 | } |
Theodore Ts'o | 76828c8 | 2013-07-15 12:27:47 -0400 | [diff] [blame] | 2955 | /* Yield here to deal with large extent trees. |
| 2956 | * Should be a no-op if we did IO above. */ |
| 2957 | cond_resched(); |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 2958 | if (WARN_ON(i + 1 > depth)) { |
| 2959 | err = -EIO; |
| 2960 | break; |
| 2961 | } |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 2962 | path[i + 1].p_bh = bh; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2963 | |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 2964 | /* save actual number of indexes since this |
| 2965 | * number is changed at the next iteration */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2966 | path[i].p_block = le16_to_cpu(path[i].p_hdr->eh_entries); |
| 2967 | i++; |
| 2968 | } else { |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 2969 | /* we finished processing this index, go up */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2970 | if (path[i].p_hdr->eh_entries == 0 && i > 0) { |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 2971 | /* index is empty, remove it; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2972 | * handle must be already prepared by the |
| 2973 | * truncatei_leaf() */ |
Forrest Liu | c36575e | 2012-12-17 09:55:39 -0500 | [diff] [blame] | 2974 | err = ext4_ext_rm_idx(handle, inode, path, i); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2975 | } |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 2976 | /* root level has p_bh == NULL, brelse() eats this */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2977 | brelse(path[i].p_bh); |
| 2978 | path[i].p_bh = NULL; |
| 2979 | i--; |
| 2980 | ext_debug("return to level %d\n", i); |
| 2981 | } |
| 2982 | } |
| 2983 | |
Lukas Czerner | 6180132 | 2013-05-27 23:32:35 -0400 | [diff] [blame] | 2984 | trace_ext4_ext_remove_space_done(inode, start, end, depth, |
| 2985 | partial_cluster, path->p_hdr->eh_entries); |
Aditya Kali | d899024 | 2011-09-09 19:18:51 -0400 | [diff] [blame] | 2986 | |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 2987 | /* If we still have something in the partial cluster and we have removed |
| 2988 | * even the first extent, then we should free the blocks in the partial |
| 2989 | * cluster as well. */ |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2990 | if (partial_cluster > 0 && path->p_hdr->eh_entries == 0) { |
Theodore Ts'o | 981250c | 2013-06-12 11:48:29 -0400 | [diff] [blame] | 2991 | int flags = get_default_free_blocks_flags(inode); |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 2992 | |
| 2993 | ext4_free_blocks(handle, inode, NULL, |
| 2994 | EXT4_C2B(EXT4_SB(sb), partial_cluster), |
| 2995 | EXT4_SB(sb)->s_cluster_ratio, flags); |
| 2996 | partial_cluster = 0; |
| 2997 | } |
| 2998 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2999 | /* TODO: flexible tree reduction should be here */ |
| 3000 | if (path->p_hdr->eh_entries == 0) { |
| 3001 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 3002 | * truncate to zero freed all the tree, |
| 3003 | * so we need to correct eh_depth |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 3004 | */ |
| 3005 | err = ext4_ext_get_access(handle, inode, path); |
| 3006 | if (err == 0) { |
| 3007 | ext_inode_hdr(inode)->eh_depth = 0; |
| 3008 | ext_inode_hdr(inode)->eh_max = |
Theodore Ts'o | 55ad63b | 2009-08-28 10:40:33 -0400 | [diff] [blame] | 3009 | cpu_to_le16(ext4_ext_space_root(inode, 0)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 3010 | err = ext4_ext_dirty(handle, inode, path); |
| 3011 | } |
| 3012 | } |
| 3013 | out: |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 3014 | ext4_ext_drop_refs(path); |
| 3015 | kfree(path); |
Ashish Sangwan | 968dee7 | 2012-07-22 22:49:08 -0400 | [diff] [blame] | 3016 | if (err == -EAGAIN) { |
| 3017 | path = NULL; |
Dmitry Monakhov | 0617b83 | 2010-05-17 01:00:00 -0400 | [diff] [blame] | 3018 | goto again; |
Ashish Sangwan | 968dee7 | 2012-07-22 22:49:08 -0400 | [diff] [blame] | 3019 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 3020 | ext4_journal_stop(handle); |
| 3021 | |
| 3022 | return err; |
| 3023 | } |
| 3024 | |
| 3025 | /* |
| 3026 | * called at mount time |
| 3027 | */ |
| 3028 | void ext4_ext_init(struct super_block *sb) |
| 3029 | { |
| 3030 | /* |
| 3031 | * possible initialization would be here |
| 3032 | */ |
| 3033 | |
Theodore Ts'o | 83982b6 | 2009-01-06 14:53:16 -0500 | [diff] [blame] | 3034 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) { |
Theodore Ts'o | 90576c0 | 2009-09-29 15:51:30 -0400 | [diff] [blame] | 3035 | #if defined(AGGRESSIVE_TEST) || defined(CHECK_BINSEARCH) || defined(EXTENTS_STATS) |
Theodore Ts'o | 92b9781 | 2012-03-19 23:41:49 -0400 | [diff] [blame] | 3036 | printk(KERN_INFO "EXT4-fs: file extents enabled" |
Robert P. J. Day | bbf2f9f | 2007-02-17 19:20:16 +0100 | [diff] [blame] | 3037 | #ifdef AGGRESSIVE_TEST |
Theodore Ts'o | 92b9781 | 2012-03-19 23:41:49 -0400 | [diff] [blame] | 3038 | ", aggressive tests" |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 3039 | #endif |
| 3040 | #ifdef CHECK_BINSEARCH |
Theodore Ts'o | 92b9781 | 2012-03-19 23:41:49 -0400 | [diff] [blame] | 3041 | ", check binsearch" |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 3042 | #endif |
| 3043 | #ifdef EXTENTS_STATS |
Theodore Ts'o | 92b9781 | 2012-03-19 23:41:49 -0400 | [diff] [blame] | 3044 | ", stats" |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 3045 | #endif |
Theodore Ts'o | 92b9781 | 2012-03-19 23:41:49 -0400 | [diff] [blame] | 3046 | "\n"); |
Theodore Ts'o | 90576c0 | 2009-09-29 15:51:30 -0400 | [diff] [blame] | 3047 | #endif |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 3048 | #ifdef EXTENTS_STATS |
| 3049 | spin_lock_init(&EXT4_SB(sb)->s_ext_stats_lock); |
| 3050 | EXT4_SB(sb)->s_ext_min = 1 << 30; |
| 3051 | EXT4_SB(sb)->s_ext_max = 0; |
| 3052 | #endif |
| 3053 | } |
| 3054 | } |
| 3055 | |
| 3056 | /* |
| 3057 | * called at umount time |
| 3058 | */ |
| 3059 | void ext4_ext_release(struct super_block *sb) |
| 3060 | { |
Theodore Ts'o | 83982b6 | 2009-01-06 14:53:16 -0500 | [diff] [blame] | 3061 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 3062 | return; |
| 3063 | |
| 3064 | #ifdef EXTENTS_STATS |
| 3065 | if (EXT4_SB(sb)->s_ext_blocks && EXT4_SB(sb)->s_ext_extents) { |
| 3066 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
| 3067 | printk(KERN_ERR "EXT4-fs: %lu blocks in %lu extents (%lu ave)\n", |
| 3068 | sbi->s_ext_blocks, sbi->s_ext_extents, |
| 3069 | sbi->s_ext_blocks / sbi->s_ext_extents); |
| 3070 | printk(KERN_ERR "EXT4-fs: extents: %lu min, %lu max, max depth %lu\n", |
| 3071 | sbi->s_ext_min, sbi->s_ext_max, sbi->s_depth_max); |
| 3072 | } |
| 3073 | #endif |
| 3074 | } |
| 3075 | |
Zheng Liu | d7b2a00 | 2013-08-28 14:47:06 -0400 | [diff] [blame] | 3076 | static int ext4_zeroout_es(struct inode *inode, struct ext4_extent *ex) |
| 3077 | { |
| 3078 | ext4_lblk_t ee_block; |
| 3079 | ext4_fsblk_t ee_pblock; |
| 3080 | unsigned int ee_len; |
| 3081 | |
| 3082 | ee_block = le32_to_cpu(ex->ee_block); |
| 3083 | ee_len = ext4_ext_get_actual_len(ex); |
| 3084 | ee_pblock = ext4_ext_pblock(ex); |
| 3085 | |
| 3086 | if (ee_len == 0) |
| 3087 | return 0; |
| 3088 | |
| 3089 | return ext4_es_insert_extent(inode, ee_block, ee_len, ee_pblock, |
| 3090 | EXTENT_STATUS_WRITTEN); |
| 3091 | } |
| 3092 | |
Aneesh Kumar K.V | 093a088 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 3093 | /* FIXME!! we need to try to merge to left or right after zero-out */ |
| 3094 | static int ext4_ext_zeroout(struct inode *inode, struct ext4_extent *ex) |
| 3095 | { |
Lukas Czerner | 2407518 | 2010-10-27 21:30:06 -0400 | [diff] [blame] | 3096 | ext4_fsblk_t ee_pblock; |
| 3097 | unsigned int ee_len; |
Jing Zhang | b720303 | 2010-05-12 00:00:00 -0400 | [diff] [blame] | 3098 | int ret; |
Aneesh Kumar K.V | 093a088 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 3099 | |
Aneesh Kumar K.V | 093a088 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 3100 | ee_len = ext4_ext_get_actual_len(ex); |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 3101 | ee_pblock = ext4_ext_pblock(ex); |
Aneesh Kumar K.V | 093a088 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 3102 | |
Theodore Ts'o | a107e5a | 2010-10-27 23:44:47 -0400 | [diff] [blame] | 3103 | ret = sb_issue_zeroout(inode->i_sb, ee_pblock, ee_len, GFP_NOFS); |
Lukas Czerner | 2407518 | 2010-10-27 21:30:06 -0400 | [diff] [blame] | 3104 | if (ret > 0) |
| 3105 | ret = 0; |
Aneesh Kumar K.V | 093a088 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 3106 | |
Lukas Czerner | 2407518 | 2010-10-27 21:30:06 -0400 | [diff] [blame] | 3107 | return ret; |
Aneesh Kumar K.V | 093a088 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 3108 | } |
| 3109 | |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3110 | /* |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3111 | * ext4_split_extent_at() splits an extent at given block. |
| 3112 | * |
| 3113 | * @handle: the journal handle |
| 3114 | * @inode: the file inode |
| 3115 | * @path: the path to the extent |
| 3116 | * @split: the logical block where the extent is splitted. |
| 3117 | * @split_flags: indicates if the extent could be zeroout if split fails, and |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3118 | * the states(init or unwritten) of new extents. |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3119 | * @flags: flags used to insert new extent to extent tree. |
| 3120 | * |
| 3121 | * |
| 3122 | * Splits extent [a, b] into two extents [a, @split) and [@split, b], states |
| 3123 | * of which are deterimined by split_flag. |
| 3124 | * |
| 3125 | * There are two cases: |
| 3126 | * a> the extent are splitted into two extent. |
| 3127 | * b> split is not needed, and just mark the extent. |
| 3128 | * |
| 3129 | * return 0 on success. |
| 3130 | */ |
| 3131 | static int ext4_split_extent_at(handle_t *handle, |
| 3132 | struct inode *inode, |
| 3133 | struct ext4_ext_path *path, |
| 3134 | ext4_lblk_t split, |
| 3135 | int split_flag, |
| 3136 | int flags) |
| 3137 | { |
| 3138 | ext4_fsblk_t newblock; |
| 3139 | ext4_lblk_t ee_block; |
Zheng Liu | adb2355 | 2013-03-10 21:13:05 -0400 | [diff] [blame] | 3140 | struct ext4_extent *ex, newex, orig_ex, zero_ex; |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3141 | struct ext4_extent *ex2 = NULL; |
| 3142 | unsigned int ee_len, depth; |
| 3143 | int err = 0; |
| 3144 | |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3145 | BUG_ON((split_flag & (EXT4_EXT_DATA_VALID1 | EXT4_EXT_DATA_VALID2)) == |
| 3146 | (EXT4_EXT_DATA_VALID1 | EXT4_EXT_DATA_VALID2)); |
| 3147 | |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3148 | ext_debug("ext4_split_extents_at: inode %lu, logical" |
| 3149 | "block %llu\n", inode->i_ino, (unsigned long long)split); |
| 3150 | |
| 3151 | ext4_ext_show_leaf(inode, path); |
| 3152 | |
| 3153 | depth = ext_depth(inode); |
| 3154 | ex = path[depth].p_ext; |
| 3155 | ee_block = le32_to_cpu(ex->ee_block); |
| 3156 | ee_len = ext4_ext_get_actual_len(ex); |
| 3157 | newblock = split - ee_block + ext4_ext_pblock(ex); |
| 3158 | |
| 3159 | BUG_ON(split < ee_block || split >= (ee_block + ee_len)); |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3160 | BUG_ON(!ext4_ext_is_unwritten(ex) && |
Dmitry Monakhov | 357b66f | 2013-03-04 00:34:34 -0500 | [diff] [blame] | 3161 | split_flag & (EXT4_EXT_MAY_ZEROOUT | |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3162 | EXT4_EXT_MARK_UNWRIT1 | |
| 3163 | EXT4_EXT_MARK_UNWRIT2)); |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3164 | |
| 3165 | err = ext4_ext_get_access(handle, inode, path + depth); |
| 3166 | if (err) |
| 3167 | goto out; |
| 3168 | |
| 3169 | if (split == ee_block) { |
| 3170 | /* |
| 3171 | * case b: block @split is the block that the extent begins with |
| 3172 | * then we just change the state of the extent, and splitting |
| 3173 | * is not needed. |
| 3174 | */ |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3175 | if (split_flag & EXT4_EXT_MARK_UNWRIT2) |
| 3176 | ext4_ext_mark_unwritten(ex); |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3177 | else |
| 3178 | ext4_ext_mark_initialized(ex); |
| 3179 | |
| 3180 | if (!(flags & EXT4_GET_BLOCKS_PRE_IO)) |
Theodore Ts'o | ecb94f5 | 2012-08-17 09:44:17 -0400 | [diff] [blame] | 3181 | ext4_ext_try_to_merge(handle, inode, path, ex); |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3182 | |
Theodore Ts'o | ecb94f5 | 2012-08-17 09:44:17 -0400 | [diff] [blame] | 3183 | err = ext4_ext_dirty(handle, inode, path + path->p_depth); |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3184 | goto out; |
| 3185 | } |
| 3186 | |
| 3187 | /* case a */ |
| 3188 | memcpy(&orig_ex, ex, sizeof(orig_ex)); |
| 3189 | ex->ee_len = cpu_to_le16(split - ee_block); |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3190 | if (split_flag & EXT4_EXT_MARK_UNWRIT1) |
| 3191 | ext4_ext_mark_unwritten(ex); |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3192 | |
| 3193 | /* |
| 3194 | * path may lead to new leaf, not to original leaf any more |
| 3195 | * after ext4_ext_insert_extent() returns, |
| 3196 | */ |
| 3197 | err = ext4_ext_dirty(handle, inode, path + depth); |
| 3198 | if (err) |
| 3199 | goto fix_extent_len; |
| 3200 | |
| 3201 | ex2 = &newex; |
| 3202 | ex2->ee_block = cpu_to_le32(split); |
| 3203 | ex2->ee_len = cpu_to_le16(ee_len - (split - ee_block)); |
| 3204 | ext4_ext_store_pblock(ex2, newblock); |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3205 | if (split_flag & EXT4_EXT_MARK_UNWRIT2) |
| 3206 | ext4_ext_mark_unwritten(ex2); |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3207 | |
| 3208 | err = ext4_ext_insert_extent(handle, inode, path, &newex, flags); |
| 3209 | if (err == -ENOSPC && (EXT4_EXT_MAY_ZEROOUT & split_flag)) { |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3210 | if (split_flag & (EXT4_EXT_DATA_VALID1|EXT4_EXT_DATA_VALID2)) { |
Zheng Liu | adb2355 | 2013-03-10 21:13:05 -0400 | [diff] [blame] | 3211 | if (split_flag & EXT4_EXT_DATA_VALID1) { |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3212 | err = ext4_ext_zeroout(inode, ex2); |
Zheng Liu | adb2355 | 2013-03-10 21:13:05 -0400 | [diff] [blame] | 3213 | zero_ex.ee_block = ex2->ee_block; |
Zheng Liu | 8cde7ad | 2013-04-03 12:27:18 -0400 | [diff] [blame] | 3214 | zero_ex.ee_len = cpu_to_le16( |
| 3215 | ext4_ext_get_actual_len(ex2)); |
Zheng Liu | adb2355 | 2013-03-10 21:13:05 -0400 | [diff] [blame] | 3216 | ext4_ext_store_pblock(&zero_ex, |
| 3217 | ext4_ext_pblock(ex2)); |
| 3218 | } else { |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3219 | err = ext4_ext_zeroout(inode, ex); |
Zheng Liu | adb2355 | 2013-03-10 21:13:05 -0400 | [diff] [blame] | 3220 | zero_ex.ee_block = ex->ee_block; |
Zheng Liu | 8cde7ad | 2013-04-03 12:27:18 -0400 | [diff] [blame] | 3221 | zero_ex.ee_len = cpu_to_le16( |
| 3222 | ext4_ext_get_actual_len(ex)); |
Zheng Liu | adb2355 | 2013-03-10 21:13:05 -0400 | [diff] [blame] | 3223 | ext4_ext_store_pblock(&zero_ex, |
| 3224 | ext4_ext_pblock(ex)); |
| 3225 | } |
| 3226 | } else { |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3227 | err = ext4_ext_zeroout(inode, &orig_ex); |
Zheng Liu | adb2355 | 2013-03-10 21:13:05 -0400 | [diff] [blame] | 3228 | zero_ex.ee_block = orig_ex.ee_block; |
Zheng Liu | 8cde7ad | 2013-04-03 12:27:18 -0400 | [diff] [blame] | 3229 | zero_ex.ee_len = cpu_to_le16( |
| 3230 | ext4_ext_get_actual_len(&orig_ex)); |
Zheng Liu | adb2355 | 2013-03-10 21:13:05 -0400 | [diff] [blame] | 3231 | ext4_ext_store_pblock(&zero_ex, |
| 3232 | ext4_ext_pblock(&orig_ex)); |
| 3233 | } |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3234 | |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3235 | if (err) |
| 3236 | goto fix_extent_len; |
| 3237 | /* update the extent length and mark as initialized */ |
Al Viro | af1584f | 2012-04-12 20:32:25 -0400 | [diff] [blame] | 3238 | ex->ee_len = cpu_to_le16(ee_len); |
Theodore Ts'o | ecb94f5 | 2012-08-17 09:44:17 -0400 | [diff] [blame] | 3239 | ext4_ext_try_to_merge(handle, inode, path, ex); |
| 3240 | err = ext4_ext_dirty(handle, inode, path + path->p_depth); |
Zheng Liu | adb2355 | 2013-03-10 21:13:05 -0400 | [diff] [blame] | 3241 | if (err) |
| 3242 | goto fix_extent_len; |
| 3243 | |
| 3244 | /* update extent status tree */ |
Zheng Liu | d7b2a00 | 2013-08-28 14:47:06 -0400 | [diff] [blame] | 3245 | err = ext4_zeroout_es(inode, &zero_ex); |
Zheng Liu | adb2355 | 2013-03-10 21:13:05 -0400 | [diff] [blame] | 3246 | |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3247 | goto out; |
| 3248 | } else if (err) |
| 3249 | goto fix_extent_len; |
| 3250 | |
| 3251 | out: |
| 3252 | ext4_ext_show_leaf(inode, path); |
| 3253 | return err; |
| 3254 | |
| 3255 | fix_extent_len: |
| 3256 | ex->ee_len = orig_ex.ee_len; |
Dmitry Monakhov | 29faed1 | 2014-07-27 22:30:29 -0400 | [diff] [blame] | 3257 | ext4_ext_dirty(handle, inode, path + path->p_depth); |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3258 | return err; |
| 3259 | } |
| 3260 | |
| 3261 | /* |
| 3262 | * ext4_split_extents() splits an extent and mark extent which is covered |
| 3263 | * by @map as split_flags indicates |
| 3264 | * |
Anatol Pomozov | 70261f5 | 2013-08-28 14:40:12 -0400 | [diff] [blame] | 3265 | * It may result in splitting the extent into multiple extents (up to three) |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3266 | * There are three possibilities: |
| 3267 | * a> There is no split required |
| 3268 | * b> Splits in two extents: Split is happening at either end of the extent |
| 3269 | * c> Splits in three extents: Somone is splitting in middle of the extent |
| 3270 | * |
| 3271 | */ |
| 3272 | static int ext4_split_extent(handle_t *handle, |
| 3273 | struct inode *inode, |
| 3274 | struct ext4_ext_path *path, |
| 3275 | struct ext4_map_blocks *map, |
| 3276 | int split_flag, |
| 3277 | int flags) |
| 3278 | { |
| 3279 | ext4_lblk_t ee_block; |
| 3280 | struct ext4_extent *ex; |
| 3281 | unsigned int ee_len, depth; |
| 3282 | int err = 0; |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3283 | int unwritten; |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3284 | int split_flag1, flags1; |
Zheng Liu | 3a22567 | 2013-03-10 21:20:23 -0400 | [diff] [blame] | 3285 | int allocated = map->m_len; |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3286 | |
| 3287 | depth = ext_depth(inode); |
| 3288 | ex = path[depth].p_ext; |
| 3289 | ee_block = le32_to_cpu(ex->ee_block); |
| 3290 | ee_len = ext4_ext_get_actual_len(ex); |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3291 | unwritten = ext4_ext_is_unwritten(ex); |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3292 | |
| 3293 | if (map->m_lblk + map->m_len < ee_block + ee_len) { |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3294 | split_flag1 = split_flag & EXT4_EXT_MAY_ZEROOUT; |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3295 | flags1 = flags | EXT4_GET_BLOCKS_PRE_IO; |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3296 | if (unwritten) |
| 3297 | split_flag1 |= EXT4_EXT_MARK_UNWRIT1 | |
| 3298 | EXT4_EXT_MARK_UNWRIT2; |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3299 | if (split_flag & EXT4_EXT_DATA_VALID2) |
| 3300 | split_flag1 |= EXT4_EXT_DATA_VALID1; |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3301 | err = ext4_split_extent_at(handle, inode, path, |
| 3302 | map->m_lblk + map->m_len, split_flag1, flags1); |
Yongqiang Yang | 9391741 | 2011-05-22 20:49:12 -0400 | [diff] [blame] | 3303 | if (err) |
| 3304 | goto out; |
Zheng Liu | 3a22567 | 2013-03-10 21:20:23 -0400 | [diff] [blame] | 3305 | } else { |
| 3306 | allocated = ee_len - (map->m_lblk - ee_block); |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3307 | } |
Dmitry Monakhov | 357b66f | 2013-03-04 00:34:34 -0500 | [diff] [blame] | 3308 | /* |
| 3309 | * Update path is required because previous ext4_split_extent_at() may |
| 3310 | * result in split of original leaf or extent zeroout. |
| 3311 | */ |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3312 | ext4_ext_drop_refs(path); |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 3313 | path = ext4_ext_find_extent(inode, map->m_lblk, path, 0); |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3314 | if (IS_ERR(path)) |
| 3315 | return PTR_ERR(path); |
Dmitry Monakhov | 357b66f | 2013-03-04 00:34:34 -0500 | [diff] [blame] | 3316 | depth = ext_depth(inode); |
| 3317 | ex = path[depth].p_ext; |
Dmitry Monakhov | a18ed35 | 2014-04-13 15:41:13 -0400 | [diff] [blame] | 3318 | if (!ex) { |
| 3319 | EXT4_ERROR_INODE(inode, "unexpected hole at %lu", |
| 3320 | (unsigned long) map->m_lblk); |
| 3321 | return -EIO; |
| 3322 | } |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3323 | unwritten = ext4_ext_is_unwritten(ex); |
Dmitry Monakhov | 357b66f | 2013-03-04 00:34:34 -0500 | [diff] [blame] | 3324 | split_flag1 = 0; |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3325 | |
| 3326 | if (map->m_lblk >= ee_block) { |
Dmitry Monakhov | 357b66f | 2013-03-04 00:34:34 -0500 | [diff] [blame] | 3327 | split_flag1 = split_flag & EXT4_EXT_DATA_VALID2; |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3328 | if (unwritten) { |
| 3329 | split_flag1 |= EXT4_EXT_MARK_UNWRIT1; |
Dmitry Monakhov | 357b66f | 2013-03-04 00:34:34 -0500 | [diff] [blame] | 3330 | split_flag1 |= split_flag & (EXT4_EXT_MAY_ZEROOUT | |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3331 | EXT4_EXT_MARK_UNWRIT2); |
Dmitry Monakhov | 357b66f | 2013-03-04 00:34:34 -0500 | [diff] [blame] | 3332 | } |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3333 | err = ext4_split_extent_at(handle, inode, path, |
| 3334 | map->m_lblk, split_flag1, flags); |
| 3335 | if (err) |
| 3336 | goto out; |
| 3337 | } |
| 3338 | |
| 3339 | ext4_ext_show_leaf(inode, path); |
| 3340 | out: |
Zheng Liu | 3a22567 | 2013-03-10 21:20:23 -0400 | [diff] [blame] | 3341 | return err ? err : allocated; |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3342 | } |
| 3343 | |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 3344 | /* |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 3345 | * This function is called by ext4_ext_map_blocks() if someone tries to write |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3346 | * to an unwritten extent. It may result in splitting the unwritten |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 3347 | * extent into multiple extents (up to three - one initialized and two |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3348 | * unwritten). |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 3349 | * There are three possibilities: |
| 3350 | * a> There is no split required: Entire extent should be initialized |
| 3351 | * b> Splits in two extents: Write is happening at either end of the extent |
| 3352 | * c> Splits in three extents: Somone is writing in middle of the extent |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3353 | * |
| 3354 | * Pre-conditions: |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3355 | * - The extent pointed to by 'path' is unwritten. |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3356 | * - The extent pointed to by 'path' contains a superset |
| 3357 | * of the logical span [map->m_lblk, map->m_lblk + map->m_len). |
| 3358 | * |
| 3359 | * Post-conditions on success: |
| 3360 | * - the returned value is the number of blocks beyond map->l_lblk |
| 3361 | * that are allocated and initialized. |
| 3362 | * It is guaranteed to be >= map->m_len. |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 3363 | */ |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 3364 | static int ext4_ext_convert_to_initialized(handle_t *handle, |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 3365 | struct inode *inode, |
| 3366 | struct ext4_map_blocks *map, |
Lukas Czerner | 27dd438 | 2013-04-09 22:11:22 -0400 | [diff] [blame] | 3367 | struct ext4_ext_path *path, |
| 3368 | int flags) |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 3369 | { |
Zheng Liu | 67a5da5 | 2012-08-17 09:54:17 -0400 | [diff] [blame] | 3370 | struct ext4_sb_info *sbi; |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3371 | struct ext4_extent_header *eh; |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3372 | struct ext4_map_blocks split_map; |
| 3373 | struct ext4_extent zero_ex; |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3374 | struct ext4_extent *ex, *abut_ex; |
Dmitry Monakhov | 21ca087 | 2010-05-16 06:00:00 -0400 | [diff] [blame] | 3375 | ext4_lblk_t ee_block, eof_block; |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3376 | unsigned int ee_len, depth, map_len = map->m_len; |
| 3377 | int allocated = 0, max_zeroout = 0; |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 3378 | int err = 0; |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3379 | int split_flag = 0; |
Dmitry Monakhov | 21ca087 | 2010-05-16 06:00:00 -0400 | [diff] [blame] | 3380 | |
| 3381 | ext_debug("ext4_ext_convert_to_initialized: inode %lu, logical" |
| 3382 | "block %llu, max_blocks %u\n", inode->i_ino, |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3383 | (unsigned long long)map->m_lblk, map_len); |
Dmitry Monakhov | 21ca087 | 2010-05-16 06:00:00 -0400 | [diff] [blame] | 3384 | |
Zheng Liu | 67a5da5 | 2012-08-17 09:54:17 -0400 | [diff] [blame] | 3385 | sbi = EXT4_SB(inode->i_sb); |
Dmitry Monakhov | 21ca087 | 2010-05-16 06:00:00 -0400 | [diff] [blame] | 3386 | eof_block = (inode->i_size + inode->i_sb->s_blocksize - 1) >> |
| 3387 | inode->i_sb->s_blocksize_bits; |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3388 | if (eof_block < map->m_lblk + map_len) |
| 3389 | eof_block = map->m_lblk + map_len; |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 3390 | |
| 3391 | depth = ext_depth(inode); |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3392 | eh = path[depth].p_hdr; |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 3393 | ex = path[depth].p_ext; |
| 3394 | ee_block = le32_to_cpu(ex->ee_block); |
| 3395 | ee_len = ext4_ext_get_actual_len(ex); |
Zheng Liu | adb2355 | 2013-03-10 21:13:05 -0400 | [diff] [blame] | 3396 | zero_ex.ee_len = 0; |
Dmitry Monakhov | 21ca087 | 2010-05-16 06:00:00 -0400 | [diff] [blame] | 3397 | |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3398 | trace_ext4_ext_convert_to_initialized_enter(inode, map, ex); |
| 3399 | |
| 3400 | /* Pre-conditions */ |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3401 | BUG_ON(!ext4_ext_is_unwritten(ex)); |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3402 | BUG_ON(!in_range(map->m_lblk, ee_block, ee_len)); |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3403 | |
| 3404 | /* |
| 3405 | * Attempt to transfer newly initialized blocks from the currently |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3406 | * unwritten extent to its neighbor. This is much cheaper |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3407 | * than an insertion followed by a merge as those involve costly |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3408 | * memmove() calls. Transferring to the left is the common case in |
| 3409 | * steady state for workloads doing fallocate(FALLOC_FL_KEEP_SIZE) |
| 3410 | * followed by append writes. |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3411 | * |
| 3412 | * Limitations of the current logic: |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3413 | * - L1: we do not deal with writes covering the whole extent. |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3414 | * This would require removing the extent if the transfer |
| 3415 | * is possible. |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3416 | * - L2: we only attempt to merge with an extent stored in the |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3417 | * same extent tree node. |
| 3418 | */ |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3419 | if ((map->m_lblk == ee_block) && |
| 3420 | /* See if we can merge left */ |
| 3421 | (map_len < ee_len) && /*L1*/ |
| 3422 | (ex > EXT_FIRST_EXTENT(eh))) { /*L2*/ |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3423 | ext4_lblk_t prev_lblk; |
| 3424 | ext4_fsblk_t prev_pblk, ee_pblk; |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3425 | unsigned int prev_len; |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3426 | |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3427 | abut_ex = ex - 1; |
| 3428 | prev_lblk = le32_to_cpu(abut_ex->ee_block); |
| 3429 | prev_len = ext4_ext_get_actual_len(abut_ex); |
| 3430 | prev_pblk = ext4_ext_pblock(abut_ex); |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3431 | ee_pblk = ext4_ext_pblock(ex); |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3432 | |
| 3433 | /* |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3434 | * A transfer of blocks from 'ex' to 'abut_ex' is allowed |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3435 | * upon those conditions: |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3436 | * - C1: abut_ex is initialized, |
| 3437 | * - C2: abut_ex is logically abutting ex, |
| 3438 | * - C3: abut_ex is physically abutting ex, |
| 3439 | * - C4: abut_ex can receive the additional blocks without |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3440 | * overflowing the (initialized) length limit. |
| 3441 | */ |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3442 | if ((!ext4_ext_is_unwritten(abut_ex)) && /*C1*/ |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3443 | ((prev_lblk + prev_len) == ee_block) && /*C2*/ |
| 3444 | ((prev_pblk + prev_len) == ee_pblk) && /*C3*/ |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3445 | (prev_len < (EXT_INIT_MAX_LEN - map_len))) { /*C4*/ |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3446 | err = ext4_ext_get_access(handle, inode, path + depth); |
| 3447 | if (err) |
| 3448 | goto out; |
| 3449 | |
| 3450 | trace_ext4_ext_convert_to_initialized_fastpath(inode, |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3451 | map, ex, abut_ex); |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3452 | |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3453 | /* Shift the start of ex by 'map_len' blocks */ |
| 3454 | ex->ee_block = cpu_to_le32(ee_block + map_len); |
| 3455 | ext4_ext_store_pblock(ex, ee_pblk + map_len); |
| 3456 | ex->ee_len = cpu_to_le16(ee_len - map_len); |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3457 | ext4_ext_mark_unwritten(ex); /* Restore the flag */ |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3458 | |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3459 | /* Extend abut_ex by 'map_len' blocks */ |
| 3460 | abut_ex->ee_len = cpu_to_le16(prev_len + map_len); |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3461 | |
| 3462 | /* Result: number of initialized blocks past m_lblk */ |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3463 | allocated = map_len; |
| 3464 | } |
| 3465 | } else if (((map->m_lblk + map_len) == (ee_block + ee_len)) && |
| 3466 | (map_len < ee_len) && /*L1*/ |
| 3467 | ex < EXT_LAST_EXTENT(eh)) { /*L2*/ |
| 3468 | /* See if we can merge right */ |
| 3469 | ext4_lblk_t next_lblk; |
| 3470 | ext4_fsblk_t next_pblk, ee_pblk; |
| 3471 | unsigned int next_len; |
| 3472 | |
| 3473 | abut_ex = ex + 1; |
| 3474 | next_lblk = le32_to_cpu(abut_ex->ee_block); |
| 3475 | next_len = ext4_ext_get_actual_len(abut_ex); |
| 3476 | next_pblk = ext4_ext_pblock(abut_ex); |
| 3477 | ee_pblk = ext4_ext_pblock(ex); |
| 3478 | |
| 3479 | /* |
| 3480 | * A transfer of blocks from 'ex' to 'abut_ex' is allowed |
| 3481 | * upon those conditions: |
| 3482 | * - C1: abut_ex is initialized, |
| 3483 | * - C2: abut_ex is logically abutting ex, |
| 3484 | * - C3: abut_ex is physically abutting ex, |
| 3485 | * - C4: abut_ex can receive the additional blocks without |
| 3486 | * overflowing the (initialized) length limit. |
| 3487 | */ |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3488 | if ((!ext4_ext_is_unwritten(abut_ex)) && /*C1*/ |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3489 | ((map->m_lblk + map_len) == next_lblk) && /*C2*/ |
| 3490 | ((ee_pblk + ee_len) == next_pblk) && /*C3*/ |
| 3491 | (next_len < (EXT_INIT_MAX_LEN - map_len))) { /*C4*/ |
| 3492 | err = ext4_ext_get_access(handle, inode, path + depth); |
| 3493 | if (err) |
| 3494 | goto out; |
| 3495 | |
| 3496 | trace_ext4_ext_convert_to_initialized_fastpath(inode, |
| 3497 | map, ex, abut_ex); |
| 3498 | |
| 3499 | /* Shift the start of abut_ex by 'map_len' blocks */ |
| 3500 | abut_ex->ee_block = cpu_to_le32(next_lblk - map_len); |
| 3501 | ext4_ext_store_pblock(abut_ex, next_pblk - map_len); |
| 3502 | ex->ee_len = cpu_to_le16(ee_len - map_len); |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3503 | ext4_ext_mark_unwritten(ex); /* Restore the flag */ |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3504 | |
| 3505 | /* Extend abut_ex by 'map_len' blocks */ |
| 3506 | abut_ex->ee_len = cpu_to_le16(next_len + map_len); |
| 3507 | |
| 3508 | /* Result: number of initialized blocks past m_lblk */ |
| 3509 | allocated = map_len; |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3510 | } |
| 3511 | } |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3512 | if (allocated) { |
| 3513 | /* Mark the block containing both extents as dirty */ |
| 3514 | ext4_ext_dirty(handle, inode, path + depth); |
| 3515 | |
| 3516 | /* Update path to point to the right extent */ |
| 3517 | path[depth].p_ext = abut_ex; |
| 3518 | goto out; |
| 3519 | } else |
| 3520 | allocated = ee_len - (map->m_lblk - ee_block); |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3521 | |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3522 | WARN_ON(map->m_lblk < ee_block); |
Dmitry Monakhov | 21ca087 | 2010-05-16 06:00:00 -0400 | [diff] [blame] | 3523 | /* |
| 3524 | * It is safe to convert extent to initialized via explicit |
Yongqiang Yang | 9e74056 | 2014-01-06 14:05:23 -0500 | [diff] [blame] | 3525 | * zeroout only if extent is fully inside i_size or new_size. |
Dmitry Monakhov | 21ca087 | 2010-05-16 06:00:00 -0400 | [diff] [blame] | 3526 | */ |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3527 | split_flag |= ee_block + ee_len <= eof_block ? EXT4_EXT_MAY_ZEROOUT : 0; |
Dmitry Monakhov | 21ca087 | 2010-05-16 06:00:00 -0400 | [diff] [blame] | 3528 | |
Zheng Liu | 67a5da5 | 2012-08-17 09:54:17 -0400 | [diff] [blame] | 3529 | if (EXT4_EXT_MAY_ZEROOUT & split_flag) |
| 3530 | max_zeroout = sbi->s_extent_max_zeroout_kb >> |
Lukas Czerner | 4f42f80 | 2013-03-12 12:40:04 -0400 | [diff] [blame] | 3531 | (inode->i_sb->s_blocksize_bits - 10); |
Zheng Liu | 67a5da5 | 2012-08-17 09:54:17 -0400 | [diff] [blame] | 3532 | |
| 3533 | /* If extent is less than s_max_zeroout_kb, zeroout directly */ |
| 3534 | if (max_zeroout && (ee_len <= max_zeroout)) { |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3535 | err = ext4_ext_zeroout(inode, ex); |
Aneesh Kumar K.V | 3977c96 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 3536 | if (err) |
Aneesh Kumar K.V | d03856b | 2008-08-02 18:51:32 -0400 | [diff] [blame] | 3537 | goto out; |
Zheng Liu | adb2355 | 2013-03-10 21:13:05 -0400 | [diff] [blame] | 3538 | zero_ex.ee_block = ex->ee_block; |
Zheng Liu | 8cde7ad | 2013-04-03 12:27:18 -0400 | [diff] [blame] | 3539 | zero_ex.ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex)); |
Zheng Liu | adb2355 | 2013-03-10 21:13:05 -0400 | [diff] [blame] | 3540 | ext4_ext_store_pblock(&zero_ex, ext4_ext_pblock(ex)); |
Aneesh Kumar K.V | d03856b | 2008-08-02 18:51:32 -0400 | [diff] [blame] | 3541 | |
| 3542 | err = ext4_ext_get_access(handle, inode, path + depth); |
| 3543 | if (err) |
| 3544 | goto out; |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3545 | ext4_ext_mark_initialized(ex); |
Theodore Ts'o | ecb94f5 | 2012-08-17 09:44:17 -0400 | [diff] [blame] | 3546 | ext4_ext_try_to_merge(handle, inode, path, ex); |
| 3547 | err = ext4_ext_dirty(handle, inode, path + path->p_depth); |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3548 | goto out; |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 3549 | } |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3550 | |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 3551 | /* |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3552 | * four cases: |
| 3553 | * 1. split the extent into three extents. |
| 3554 | * 2. split the extent into two extents, zeroout the first half. |
| 3555 | * 3. split the extent into two extents, zeroout the second half. |
| 3556 | * 4. split the extent into two extents with out zeroout. |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 3557 | */ |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3558 | split_map.m_lblk = map->m_lblk; |
| 3559 | split_map.m_len = map->m_len; |
| 3560 | |
Zheng Liu | 67a5da5 | 2012-08-17 09:54:17 -0400 | [diff] [blame] | 3561 | if (max_zeroout && (allocated > map->m_len)) { |
| 3562 | if (allocated <= max_zeroout) { |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3563 | /* case 3 */ |
| 3564 | zero_ex.ee_block = |
Allison Henderson | 9b940f8 | 2011-05-16 10:11:09 -0400 | [diff] [blame] | 3565 | cpu_to_le32(map->m_lblk); |
| 3566 | zero_ex.ee_len = cpu_to_le16(allocated); |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3567 | ext4_ext_store_pblock(&zero_ex, |
| 3568 | ext4_ext_pblock(ex) + map->m_lblk - ee_block); |
| 3569 | err = ext4_ext_zeroout(inode, &zero_ex); |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 3570 | if (err) |
| 3571 | goto out; |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3572 | split_map.m_lblk = map->m_lblk; |
| 3573 | split_map.m_len = allocated; |
Zheng Liu | 67a5da5 | 2012-08-17 09:54:17 -0400 | [diff] [blame] | 3574 | } else if (map->m_lblk - ee_block + map->m_len < max_zeroout) { |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3575 | /* case 2 */ |
| 3576 | if (map->m_lblk != ee_block) { |
| 3577 | zero_ex.ee_block = ex->ee_block; |
| 3578 | zero_ex.ee_len = cpu_to_le16(map->m_lblk - |
| 3579 | ee_block); |
| 3580 | ext4_ext_store_pblock(&zero_ex, |
| 3581 | ext4_ext_pblock(ex)); |
| 3582 | err = ext4_ext_zeroout(inode, &zero_ex); |
| 3583 | if (err) |
| 3584 | goto out; |
| 3585 | } |
| 3586 | |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3587 | split_map.m_lblk = ee_block; |
Allison Henderson | 9b940f8 | 2011-05-16 10:11:09 -0400 | [diff] [blame] | 3588 | split_map.m_len = map->m_lblk - ee_block + map->m_len; |
| 3589 | allocated = map->m_len; |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 3590 | } |
| 3591 | } |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3592 | |
| 3593 | allocated = ext4_split_extent(handle, inode, path, |
Lukas Czerner | 27dd438 | 2013-04-09 22:11:22 -0400 | [diff] [blame] | 3594 | &split_map, split_flag, flags); |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3595 | if (allocated < 0) |
| 3596 | err = allocated; |
| 3597 | |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 3598 | out: |
Zheng Liu | adb2355 | 2013-03-10 21:13:05 -0400 | [diff] [blame] | 3599 | /* If we have gotten a failure, don't zero out status tree */ |
| 3600 | if (!err) |
Zheng Liu | d7b2a00 | 2013-08-28 14:47:06 -0400 | [diff] [blame] | 3601 | err = ext4_zeroout_es(inode, &zero_ex); |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 3602 | return err ? err : allocated; |
| 3603 | } |
| 3604 | |
Aneesh Kumar K.V | c278bfe | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 3605 | /* |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 3606 | * This function is called by ext4_ext_map_blocks() from |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3607 | * ext4_get_blocks_dio_write() when DIO to write |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3608 | * to an unwritten extent. |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3609 | * |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3610 | * Writing to an unwritten extent may result in splitting the unwritten |
| 3611 | * extent into multiple initialized/unwritten extents (up to three) |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3612 | * There are three possibilities: |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3613 | * a> There is no split required: Entire extent should be unwritten |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3614 | * b> Splits in two extents: Write is happening at either end of the extent |
| 3615 | * c> Splits in three extents: Somone is writing in middle of the extent |
| 3616 | * |
Lukas Czerner | b8a8684 | 2014-03-18 18:05:35 -0400 | [diff] [blame] | 3617 | * This works the same way in the case of initialized -> unwritten conversion. |
| 3618 | * |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3619 | * One of more index blocks maybe needed if the extent tree grow after |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3620 | * the unwritten extent split. To prevent ENOSPC occur at the IO |
| 3621 | * complete, we need to split the unwritten extent before DIO submit |
| 3622 | * the IO. The unwritten extent called at this time will be split |
| 3623 | * into three unwritten extent(at most). After IO complete, the part |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3624 | * being filled will be convert to initialized by the end_io callback function |
| 3625 | * via ext4_convert_unwritten_extents(). |
Mingming | ba230c3 | 2009-11-06 04:01:23 -0500 | [diff] [blame] | 3626 | * |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3627 | * Returns the size of unwritten extent to be written on success. |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3628 | */ |
Lukas Czerner | b8a8684 | 2014-03-18 18:05:35 -0400 | [diff] [blame] | 3629 | static int ext4_split_convert_extents(handle_t *handle, |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3630 | struct inode *inode, |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 3631 | struct ext4_map_blocks *map, |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3632 | struct ext4_ext_path *path, |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3633 | int flags) |
| 3634 | { |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3635 | ext4_lblk_t eof_block; |
| 3636 | ext4_lblk_t ee_block; |
| 3637 | struct ext4_extent *ex; |
| 3638 | unsigned int ee_len; |
| 3639 | int split_flag = 0, depth; |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3640 | |
Lukas Czerner | b8a8684 | 2014-03-18 18:05:35 -0400 | [diff] [blame] | 3641 | ext_debug("%s: inode %lu, logical block %llu, max_blocks %u\n", |
| 3642 | __func__, inode->i_ino, |
| 3643 | (unsigned long long)map->m_lblk, map->m_len); |
Dmitry Monakhov | 21ca087 | 2010-05-16 06:00:00 -0400 | [diff] [blame] | 3644 | |
| 3645 | eof_block = (inode->i_size + inode->i_sb->s_blocksize - 1) >> |
| 3646 | inode->i_sb->s_blocksize_bits; |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 3647 | if (eof_block < map->m_lblk + map->m_len) |
| 3648 | eof_block = map->m_lblk + map->m_len; |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3649 | /* |
Dmitry Monakhov | 21ca087 | 2010-05-16 06:00:00 -0400 | [diff] [blame] | 3650 | * It is safe to convert extent to initialized via explicit |
| 3651 | * zeroout only if extent is fully insde i_size or new_size. |
| 3652 | */ |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3653 | depth = ext_depth(inode); |
| 3654 | ex = path[depth].p_ext; |
| 3655 | ee_block = le32_to_cpu(ex->ee_block); |
| 3656 | ee_len = ext4_ext_get_actual_len(ex); |
Dmitry Monakhov | 21ca087 | 2010-05-16 06:00:00 -0400 | [diff] [blame] | 3657 | |
Lukas Czerner | b8a8684 | 2014-03-18 18:05:35 -0400 | [diff] [blame] | 3658 | /* Convert to unwritten */ |
| 3659 | if (flags & EXT4_GET_BLOCKS_CONVERT_UNWRITTEN) { |
| 3660 | split_flag |= EXT4_EXT_DATA_VALID1; |
| 3661 | /* Convert to initialized */ |
| 3662 | } else if (flags & EXT4_GET_BLOCKS_CONVERT) { |
| 3663 | split_flag |= ee_block + ee_len <= eof_block ? |
| 3664 | EXT4_EXT_MAY_ZEROOUT : 0; |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3665 | split_flag |= (EXT4_EXT_MARK_UNWRIT2 | EXT4_EXT_DATA_VALID2); |
Lukas Czerner | b8a8684 | 2014-03-18 18:05:35 -0400 | [diff] [blame] | 3666 | } |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3667 | flags |= EXT4_GET_BLOCKS_PRE_IO; |
| 3668 | return ext4_split_extent(handle, inode, path, map, split_flag, flags); |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3669 | } |
Yongqiang Yang | 197217a | 2011-05-03 11:45:29 -0400 | [diff] [blame] | 3670 | |
Lukas Czerner | b8a8684 | 2014-03-18 18:05:35 -0400 | [diff] [blame] | 3671 | static int ext4_convert_initialized_extents(handle_t *handle, |
| 3672 | struct inode *inode, |
| 3673 | struct ext4_map_blocks *map, |
| 3674 | struct ext4_ext_path *path) |
| 3675 | { |
| 3676 | struct ext4_extent *ex; |
| 3677 | ext4_lblk_t ee_block; |
| 3678 | unsigned int ee_len; |
| 3679 | int depth; |
| 3680 | int err = 0; |
| 3681 | |
| 3682 | depth = ext_depth(inode); |
| 3683 | ex = path[depth].p_ext; |
| 3684 | ee_block = le32_to_cpu(ex->ee_block); |
| 3685 | ee_len = ext4_ext_get_actual_len(ex); |
| 3686 | |
| 3687 | ext_debug("%s: inode %lu, logical" |
| 3688 | "block %llu, max_blocks %u\n", __func__, inode->i_ino, |
| 3689 | (unsigned long long)ee_block, ee_len); |
| 3690 | |
| 3691 | if (ee_block != map->m_lblk || ee_len > map->m_len) { |
| 3692 | err = ext4_split_convert_extents(handle, inode, map, path, |
| 3693 | EXT4_GET_BLOCKS_CONVERT_UNWRITTEN); |
| 3694 | if (err < 0) |
| 3695 | goto out; |
| 3696 | ext4_ext_drop_refs(path); |
| 3697 | path = ext4_ext_find_extent(inode, map->m_lblk, path, 0); |
| 3698 | if (IS_ERR(path)) { |
| 3699 | err = PTR_ERR(path); |
| 3700 | goto out; |
| 3701 | } |
| 3702 | depth = ext_depth(inode); |
| 3703 | ex = path[depth].p_ext; |
Dmitry Monakhov | a18ed35 | 2014-04-13 15:41:13 -0400 | [diff] [blame] | 3704 | if (!ex) { |
| 3705 | EXT4_ERROR_INODE(inode, "unexpected hole at %lu", |
| 3706 | (unsigned long) map->m_lblk); |
| 3707 | err = -EIO; |
| 3708 | goto out; |
| 3709 | } |
Lukas Czerner | b8a8684 | 2014-03-18 18:05:35 -0400 | [diff] [blame] | 3710 | } |
| 3711 | |
| 3712 | err = ext4_ext_get_access(handle, inode, path + depth); |
| 3713 | if (err) |
| 3714 | goto out; |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3715 | /* first mark the extent as unwritten */ |
| 3716 | ext4_ext_mark_unwritten(ex); |
Lukas Czerner | b8a8684 | 2014-03-18 18:05:35 -0400 | [diff] [blame] | 3717 | |
| 3718 | /* note: ext4_ext_correct_indexes() isn't needed here because |
| 3719 | * borders are not changed |
| 3720 | */ |
| 3721 | ext4_ext_try_to_merge(handle, inode, path, ex); |
| 3722 | |
| 3723 | /* Mark modified extent as dirty */ |
| 3724 | err = ext4_ext_dirty(handle, inode, path + path->p_depth); |
| 3725 | out: |
| 3726 | ext4_ext_show_leaf(inode, path); |
| 3727 | return err; |
| 3728 | } |
| 3729 | |
| 3730 | |
Jiaying Zhang | c7064ef | 2010-03-02 13:28:44 -0500 | [diff] [blame] | 3731 | static int ext4_convert_unwritten_extents_endio(handle_t *handle, |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3732 | struct inode *inode, |
| 3733 | struct ext4_map_blocks *map, |
| 3734 | struct ext4_ext_path *path) |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3735 | { |
| 3736 | struct ext4_extent *ex; |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3737 | ext4_lblk_t ee_block; |
| 3738 | unsigned int ee_len; |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3739 | int depth; |
| 3740 | int err = 0; |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3741 | |
| 3742 | depth = ext_depth(inode); |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3743 | ex = path[depth].p_ext; |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3744 | ee_block = le32_to_cpu(ex->ee_block); |
| 3745 | ee_len = ext4_ext_get_actual_len(ex); |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3746 | |
Yongqiang Yang | 197217a | 2011-05-03 11:45:29 -0400 | [diff] [blame] | 3747 | ext_debug("ext4_convert_unwritten_extents_endio: inode %lu, logical" |
| 3748 | "block %llu, max_blocks %u\n", inode->i_ino, |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3749 | (unsigned long long)ee_block, ee_len); |
| 3750 | |
Dmitry Monakhov | ff95ec2 | 2013-03-04 00:41:05 -0500 | [diff] [blame] | 3751 | /* If extent is larger than requested it is a clear sign that we still |
| 3752 | * have some extent state machine issues left. So extent_split is still |
| 3753 | * required. |
| 3754 | * TODO: Once all related issues will be fixed this situation should be |
| 3755 | * illegal. |
| 3756 | */ |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3757 | if (ee_block != map->m_lblk || ee_len > map->m_len) { |
Dmitry Monakhov | ff95ec2 | 2013-03-04 00:41:05 -0500 | [diff] [blame] | 3758 | #ifdef EXT4_DEBUG |
| 3759 | ext4_warning("Inode (%ld) finished: extent logical block %llu," |
| 3760 | " len %u; IO logical block %llu, len %u\n", |
| 3761 | inode->i_ino, (unsigned long long)ee_block, ee_len, |
| 3762 | (unsigned long long)map->m_lblk, map->m_len); |
| 3763 | #endif |
Lukas Czerner | b8a8684 | 2014-03-18 18:05:35 -0400 | [diff] [blame] | 3764 | err = ext4_split_convert_extents(handle, inode, map, path, |
| 3765 | EXT4_GET_BLOCKS_CONVERT); |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3766 | if (err < 0) |
| 3767 | goto out; |
| 3768 | ext4_ext_drop_refs(path); |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 3769 | path = ext4_ext_find_extent(inode, map->m_lblk, path, 0); |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3770 | if (IS_ERR(path)) { |
| 3771 | err = PTR_ERR(path); |
| 3772 | goto out; |
| 3773 | } |
| 3774 | depth = ext_depth(inode); |
| 3775 | ex = path[depth].p_ext; |
| 3776 | } |
Yongqiang Yang | 197217a | 2011-05-03 11:45:29 -0400 | [diff] [blame] | 3777 | |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3778 | err = ext4_ext_get_access(handle, inode, path + depth); |
| 3779 | if (err) |
| 3780 | goto out; |
| 3781 | /* first mark the extent as initialized */ |
| 3782 | ext4_ext_mark_initialized(ex); |
| 3783 | |
Yongqiang Yang | 197217a | 2011-05-03 11:45:29 -0400 | [diff] [blame] | 3784 | /* note: ext4_ext_correct_indexes() isn't needed here because |
| 3785 | * borders are not changed |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3786 | */ |
Theodore Ts'o | ecb94f5 | 2012-08-17 09:44:17 -0400 | [diff] [blame] | 3787 | ext4_ext_try_to_merge(handle, inode, path, ex); |
Yongqiang Yang | 197217a | 2011-05-03 11:45:29 -0400 | [diff] [blame] | 3788 | |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3789 | /* Mark modified extent as dirty */ |
Theodore Ts'o | ecb94f5 | 2012-08-17 09:44:17 -0400 | [diff] [blame] | 3790 | err = ext4_ext_dirty(handle, inode, path + path->p_depth); |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3791 | out: |
| 3792 | ext4_ext_show_leaf(inode, path); |
| 3793 | return err; |
| 3794 | } |
| 3795 | |
Aneesh Kumar K.V | 515f41c | 2009-12-29 23:39:06 -0500 | [diff] [blame] | 3796 | static void unmap_underlying_metadata_blocks(struct block_device *bdev, |
| 3797 | sector_t block, int count) |
| 3798 | { |
| 3799 | int i; |
| 3800 | for (i = 0; i < count; i++) |
| 3801 | unmap_underlying_metadata(bdev, block + i); |
| 3802 | } |
| 3803 | |
Theodore Ts'o | 58590b0 | 2010-10-27 21:23:12 -0400 | [diff] [blame] | 3804 | /* |
| 3805 | * Handle EOFBLOCKS_FL flag, clearing it if necessary |
| 3806 | */ |
| 3807 | static int check_eofblocks_fl(handle_t *handle, struct inode *inode, |
Eric Sandeen | d002ebf | 2011-01-10 13:03:35 -0500 | [diff] [blame] | 3808 | ext4_lblk_t lblk, |
Theodore Ts'o | 58590b0 | 2010-10-27 21:23:12 -0400 | [diff] [blame] | 3809 | struct ext4_ext_path *path, |
| 3810 | unsigned int len) |
| 3811 | { |
| 3812 | int i, depth; |
| 3813 | struct ext4_extent_header *eh; |
Sergey Senozhatsky | 65922cb | 2011-03-23 14:08:27 -0400 | [diff] [blame] | 3814 | struct ext4_extent *last_ex; |
Theodore Ts'o | 58590b0 | 2010-10-27 21:23:12 -0400 | [diff] [blame] | 3815 | |
| 3816 | if (!ext4_test_inode_flag(inode, EXT4_INODE_EOFBLOCKS)) |
| 3817 | return 0; |
| 3818 | |
| 3819 | depth = ext_depth(inode); |
| 3820 | eh = path[depth].p_hdr; |
Theodore Ts'o | 58590b0 | 2010-10-27 21:23:12 -0400 | [diff] [blame] | 3821 | |
Lukas Czerner | afcff5d | 2012-03-21 21:47:55 -0400 | [diff] [blame] | 3822 | /* |
| 3823 | * We're going to remove EOFBLOCKS_FL entirely in future so we |
| 3824 | * do not care for this case anymore. Simply remove the flag |
| 3825 | * if there are no extents. |
| 3826 | */ |
| 3827 | if (unlikely(!eh->eh_entries)) |
| 3828 | goto out; |
Theodore Ts'o | 58590b0 | 2010-10-27 21:23:12 -0400 | [diff] [blame] | 3829 | last_ex = EXT_LAST_EXTENT(eh); |
| 3830 | /* |
| 3831 | * We should clear the EOFBLOCKS_FL flag if we are writing the |
| 3832 | * last block in the last extent in the file. We test this by |
| 3833 | * first checking to see if the caller to |
| 3834 | * ext4_ext_get_blocks() was interested in the last block (or |
| 3835 | * a block beyond the last block) in the current extent. If |
| 3836 | * this turns out to be false, we can bail out from this |
| 3837 | * function immediately. |
| 3838 | */ |
Eric Sandeen | d002ebf | 2011-01-10 13:03:35 -0500 | [diff] [blame] | 3839 | if (lblk + len < le32_to_cpu(last_ex->ee_block) + |
Theodore Ts'o | 58590b0 | 2010-10-27 21:23:12 -0400 | [diff] [blame] | 3840 | ext4_ext_get_actual_len(last_ex)) |
| 3841 | return 0; |
| 3842 | /* |
| 3843 | * If the caller does appear to be planning to write at or |
| 3844 | * beyond the end of the current extent, we then test to see |
| 3845 | * if the current extent is the last extent in the file, by |
| 3846 | * checking to make sure it was reached via the rightmost node |
| 3847 | * at each level of the tree. |
| 3848 | */ |
| 3849 | for (i = depth-1; i >= 0; i--) |
| 3850 | if (path[i].p_idx != EXT_LAST_INDEX(path[i].p_hdr)) |
| 3851 | return 0; |
Lukas Czerner | afcff5d | 2012-03-21 21:47:55 -0400 | [diff] [blame] | 3852 | out: |
Theodore Ts'o | 58590b0 | 2010-10-27 21:23:12 -0400 | [diff] [blame] | 3853 | ext4_clear_inode_flag(inode, EXT4_INODE_EOFBLOCKS); |
| 3854 | return ext4_mark_inode_dirty(handle, inode); |
| 3855 | } |
| 3856 | |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 3857 | /** |
| 3858 | * ext4_find_delalloc_range: find delayed allocated block in the given range. |
| 3859 | * |
Zheng Liu | 7d1b1fb | 2012-11-08 21:57:35 -0500 | [diff] [blame] | 3860 | * Return 1 if there is a delalloc block in the range, otherwise 0. |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 3861 | */ |
Zheng Liu | f7fec03 | 2013-02-18 00:28:47 -0500 | [diff] [blame] | 3862 | int ext4_find_delalloc_range(struct inode *inode, |
| 3863 | ext4_lblk_t lblk_start, |
| 3864 | ext4_lblk_t lblk_end) |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 3865 | { |
Zheng Liu | 7d1b1fb | 2012-11-08 21:57:35 -0500 | [diff] [blame] | 3866 | struct extent_status es; |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 3867 | |
Yan, Zheng | e30b5dc | 2013-05-03 02:15:52 -0400 | [diff] [blame] | 3868 | ext4_es_find_delayed_extent_range(inode, lblk_start, lblk_end, &es); |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 3869 | if (es.es_len == 0) |
Zheng Liu | 7d1b1fb | 2012-11-08 21:57:35 -0500 | [diff] [blame] | 3870 | return 0; /* there is no delay extent in this tree */ |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 3871 | else if (es.es_lblk <= lblk_start && |
| 3872 | lblk_start < es.es_lblk + es.es_len) |
Zheng Liu | 7d1b1fb | 2012-11-08 21:57:35 -0500 | [diff] [blame] | 3873 | return 1; |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 3874 | else if (lblk_start <= es.es_lblk && es.es_lblk <= lblk_end) |
Zheng Liu | 7d1b1fb | 2012-11-08 21:57:35 -0500 | [diff] [blame] | 3875 | return 1; |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 3876 | else |
Zheng Liu | 7d1b1fb | 2012-11-08 21:57:35 -0500 | [diff] [blame] | 3877 | return 0; |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 3878 | } |
| 3879 | |
Zheng Liu | 7d1b1fb | 2012-11-08 21:57:35 -0500 | [diff] [blame] | 3880 | int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk) |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 3881 | { |
| 3882 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
| 3883 | ext4_lblk_t lblk_start, lblk_end; |
Theodore Ts'o | f5a44db | 2013-12-20 09:29:35 -0500 | [diff] [blame] | 3884 | lblk_start = EXT4_LBLK_CMASK(sbi, lblk); |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 3885 | lblk_end = lblk_start + sbi->s_cluster_ratio - 1; |
| 3886 | |
Zheng Liu | 7d1b1fb | 2012-11-08 21:57:35 -0500 | [diff] [blame] | 3887 | return ext4_find_delalloc_range(inode, lblk_start, lblk_end); |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 3888 | } |
| 3889 | |
| 3890 | /** |
| 3891 | * Determines how many complete clusters (out of those specified by the 'map') |
| 3892 | * are under delalloc and were reserved quota for. |
| 3893 | * This function is called when we are writing out the blocks that were |
| 3894 | * originally written with their allocation delayed, but then the space was |
| 3895 | * allocated using fallocate() before the delayed allocation could be resolved. |
| 3896 | * The cases to look for are: |
| 3897 | * ('=' indicated delayed allocated blocks |
| 3898 | * '-' indicates non-delayed allocated blocks) |
| 3899 | * (a) partial clusters towards beginning and/or end outside of allocated range |
| 3900 | * are not delalloc'ed. |
| 3901 | * Ex: |
| 3902 | * |----c---=|====c====|====c====|===-c----| |
| 3903 | * |++++++ allocated ++++++| |
| 3904 | * ==> 4 complete clusters in above example |
| 3905 | * |
| 3906 | * (b) partial cluster (outside of allocated range) towards either end is |
| 3907 | * marked for delayed allocation. In this case, we will exclude that |
| 3908 | * cluster. |
| 3909 | * Ex: |
| 3910 | * |----====c========|========c========| |
| 3911 | * |++++++ allocated ++++++| |
| 3912 | * ==> 1 complete clusters in above example |
| 3913 | * |
| 3914 | * Ex: |
| 3915 | * |================c================| |
| 3916 | * |++++++ allocated ++++++| |
| 3917 | * ==> 0 complete clusters in above example |
| 3918 | * |
| 3919 | * The ext4_da_update_reserve_space will be called only if we |
| 3920 | * determine here that there were some "entire" clusters that span |
| 3921 | * this 'allocated' range. |
| 3922 | * In the non-bigalloc case, this function will just end up returning num_blks |
| 3923 | * without ever calling ext4_find_delalloc_range. |
| 3924 | */ |
| 3925 | static unsigned int |
| 3926 | get_reserved_cluster_alloc(struct inode *inode, ext4_lblk_t lblk_start, |
| 3927 | unsigned int num_blks) |
| 3928 | { |
| 3929 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
| 3930 | ext4_lblk_t alloc_cluster_start, alloc_cluster_end; |
| 3931 | ext4_lblk_t lblk_from, lblk_to, c_offset; |
| 3932 | unsigned int allocated_clusters = 0; |
| 3933 | |
| 3934 | alloc_cluster_start = EXT4_B2C(sbi, lblk_start); |
| 3935 | alloc_cluster_end = EXT4_B2C(sbi, lblk_start + num_blks - 1); |
| 3936 | |
| 3937 | /* max possible clusters for this allocation */ |
| 3938 | allocated_clusters = alloc_cluster_end - alloc_cluster_start + 1; |
| 3939 | |
Aditya Kali | d899024 | 2011-09-09 19:18:51 -0400 | [diff] [blame] | 3940 | trace_ext4_get_reserved_cluster_alloc(inode, lblk_start, num_blks); |
| 3941 | |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 3942 | /* Check towards left side */ |
Theodore Ts'o | f5a44db | 2013-12-20 09:29:35 -0500 | [diff] [blame] | 3943 | c_offset = EXT4_LBLK_COFF(sbi, lblk_start); |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 3944 | if (c_offset) { |
Theodore Ts'o | f5a44db | 2013-12-20 09:29:35 -0500 | [diff] [blame] | 3945 | lblk_from = EXT4_LBLK_CMASK(sbi, lblk_start); |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 3946 | lblk_to = lblk_from + c_offset - 1; |
| 3947 | |
Zheng Liu | 7d1b1fb | 2012-11-08 21:57:35 -0500 | [diff] [blame] | 3948 | if (ext4_find_delalloc_range(inode, lblk_from, lblk_to)) |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 3949 | allocated_clusters--; |
| 3950 | } |
| 3951 | |
| 3952 | /* Now check towards right. */ |
Theodore Ts'o | f5a44db | 2013-12-20 09:29:35 -0500 | [diff] [blame] | 3953 | c_offset = EXT4_LBLK_COFF(sbi, lblk_start + num_blks); |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 3954 | if (allocated_clusters && c_offset) { |
| 3955 | lblk_from = lblk_start + num_blks; |
| 3956 | lblk_to = lblk_from + (sbi->s_cluster_ratio - c_offset) - 1; |
| 3957 | |
Zheng Liu | 7d1b1fb | 2012-11-08 21:57:35 -0500 | [diff] [blame] | 3958 | if (ext4_find_delalloc_range(inode, lblk_from, lblk_to)) |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 3959 | allocated_clusters--; |
| 3960 | } |
| 3961 | |
| 3962 | return allocated_clusters; |
| 3963 | } |
| 3964 | |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3965 | static int |
Lukas Czerner | b8a8684 | 2014-03-18 18:05:35 -0400 | [diff] [blame] | 3966 | ext4_ext_convert_initialized_extent(handle_t *handle, struct inode *inode, |
| 3967 | struct ext4_map_blocks *map, |
| 3968 | struct ext4_ext_path *path, int flags, |
| 3969 | unsigned int allocated, ext4_fsblk_t newblock) |
| 3970 | { |
| 3971 | int ret = 0; |
| 3972 | int err = 0; |
| 3973 | |
| 3974 | /* |
| 3975 | * Make sure that the extent is no bigger than we support with |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3976 | * unwritten extent |
Lukas Czerner | b8a8684 | 2014-03-18 18:05:35 -0400 | [diff] [blame] | 3977 | */ |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3978 | if (map->m_len > EXT_UNWRITTEN_MAX_LEN) |
| 3979 | map->m_len = EXT_UNWRITTEN_MAX_LEN / 2; |
Lukas Czerner | b8a8684 | 2014-03-18 18:05:35 -0400 | [diff] [blame] | 3980 | |
| 3981 | ret = ext4_convert_initialized_extents(handle, inode, map, |
| 3982 | path); |
| 3983 | if (ret >= 0) { |
| 3984 | ext4_update_inode_fsync_trans(handle, inode, 1); |
| 3985 | err = check_eofblocks_fl(handle, inode, map->m_lblk, |
| 3986 | path, map->m_len); |
| 3987 | } else |
| 3988 | err = ret; |
| 3989 | map->m_flags |= EXT4_MAP_UNWRITTEN; |
| 3990 | if (allocated > map->m_len) |
| 3991 | allocated = map->m_len; |
| 3992 | map->m_len = allocated; |
| 3993 | |
| 3994 | return err ? err : allocated; |
| 3995 | } |
| 3996 | |
| 3997 | static int |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 3998 | ext4_ext_handle_unwritten_extents(handle_t *handle, struct inode *inode, |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 3999 | struct ext4_map_blocks *map, |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4000 | struct ext4_ext_path *path, int flags, |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4001 | unsigned int allocated, ext4_fsblk_t newblock) |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4002 | { |
| 4003 | int ret = 0; |
| 4004 | int err = 0; |
Dmitry Monakhov | f45ee3a | 2012-09-28 23:21:09 -0400 | [diff] [blame] | 4005 | ext4_io_end_t *io = ext4_inode_aio(inode); |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4006 | |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 4007 | ext_debug("ext4_ext_handle_unwritten_extents: inode %lu, logical " |
Zheng Liu | 88635ca | 2011-12-28 19:00:25 -0500 | [diff] [blame] | 4008 | "block %llu, max_blocks %u, flags %x, allocated %u\n", |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4009 | inode->i_ino, (unsigned long long)map->m_lblk, map->m_len, |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4010 | flags, allocated); |
| 4011 | ext4_ext_show_leaf(inode, path); |
| 4012 | |
Lukas Czerner | 27dd438 | 2013-04-09 22:11:22 -0400 | [diff] [blame] | 4013 | /* |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 4014 | * When writing into unwritten space, we should not fail to |
Lukas Czerner | 27dd438 | 2013-04-09 22:11:22 -0400 | [diff] [blame] | 4015 | * allocate metadata blocks for the new extent block if needed. |
| 4016 | */ |
| 4017 | flags |= EXT4_GET_BLOCKS_METADATA_NOFAIL; |
| 4018 | |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 4019 | trace_ext4_ext_handle_unwritten_extents(inode, map, flags, |
Zheng Liu | b564553 | 2012-11-08 14:33:43 -0500 | [diff] [blame] | 4020 | allocated, newblock); |
Aditya Kali | d899024 | 2011-09-09 19:18:51 -0400 | [diff] [blame] | 4021 | |
Jiaying Zhang | c7064ef | 2010-03-02 13:28:44 -0500 | [diff] [blame] | 4022 | /* get_block() before submit the IO, split the extent */ |
Lukas Czerner | c8b459f | 2014-05-12 12:55:07 -0400 | [diff] [blame] | 4023 | if (flags & EXT4_GET_BLOCKS_PRE_IO) { |
Lukas Czerner | b8a8684 | 2014-03-18 18:05:35 -0400 | [diff] [blame] | 4024 | ret = ext4_split_convert_extents(handle, inode, map, |
| 4025 | path, flags | EXT4_GET_BLOCKS_CONVERT); |
Dmitry Monakhov | 82e5422 | 2012-09-28 23:36:25 -0400 | [diff] [blame] | 4026 | if (ret <= 0) |
| 4027 | goto out; |
Mingming | 5f52495 | 2009-11-10 10:48:04 -0500 | [diff] [blame] | 4028 | /* |
| 4029 | * Flag the inode(non aio case) or end_io struct (aio case) |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 4030 | * that this IO needs to conversion to written when IO is |
Mingming | 5f52495 | 2009-11-10 10:48:04 -0500 | [diff] [blame] | 4031 | * completed |
| 4032 | */ |
Tao Ma | 0edeb71 | 2011-10-31 17:30:44 -0400 | [diff] [blame] | 4033 | if (io) |
| 4034 | ext4_set_io_unwritten_flag(inode, io); |
| 4035 | else |
Theodore Ts'o | 19f5fb7 | 2010-01-24 14:34:07 -0500 | [diff] [blame] | 4036 | ext4_set_inode_state(inode, EXT4_STATE_DIO_UNWRITTEN); |
Zheng Liu | a25a4e1 | 2013-02-18 00:28:04 -0500 | [diff] [blame] | 4037 | map->m_flags |= EXT4_MAP_UNWRITTEN; |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4038 | goto out; |
| 4039 | } |
Jiaying Zhang | c7064ef | 2010-03-02 13:28:44 -0500 | [diff] [blame] | 4040 | /* IO end_io complete, convert the filled extent to written */ |
Lukas Czerner | c8b459f | 2014-05-12 12:55:07 -0400 | [diff] [blame] | 4041 | if (flags & EXT4_GET_BLOCKS_CONVERT) { |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 4042 | ret = ext4_convert_unwritten_extents_endio(handle, inode, map, |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4043 | path); |
Theodore Ts'o | 58590b0 | 2010-10-27 21:23:12 -0400 | [diff] [blame] | 4044 | if (ret >= 0) { |
Jan Kara | b436b9b | 2009-12-08 23:51:10 -0500 | [diff] [blame] | 4045 | ext4_update_inode_fsync_trans(handle, inode, 1); |
Eric Sandeen | d002ebf | 2011-01-10 13:03:35 -0500 | [diff] [blame] | 4046 | err = check_eofblocks_fl(handle, inode, map->m_lblk, |
| 4047 | path, map->m_len); |
Theodore Ts'o | 58590b0 | 2010-10-27 21:23:12 -0400 | [diff] [blame] | 4048 | } else |
| 4049 | err = ret; |
Zheng Liu | cdee784 | 2013-03-10 21:08:52 -0400 | [diff] [blame] | 4050 | map->m_flags |= EXT4_MAP_MAPPED; |
Eric Whitney | 15cc176 | 2014-02-12 10:42:45 -0500 | [diff] [blame] | 4051 | map->m_pblk = newblock; |
Zheng Liu | cdee784 | 2013-03-10 21:08:52 -0400 | [diff] [blame] | 4052 | if (allocated > map->m_len) |
| 4053 | allocated = map->m_len; |
| 4054 | map->m_len = allocated; |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4055 | goto out2; |
| 4056 | } |
| 4057 | /* buffered IO case */ |
| 4058 | /* |
| 4059 | * repeat fallocate creation request |
| 4060 | * we already have an unwritten extent |
| 4061 | */ |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 4062 | if (flags & EXT4_GET_BLOCKS_UNWRIT_EXT) { |
Zheng Liu | a25a4e1 | 2013-02-18 00:28:04 -0500 | [diff] [blame] | 4063 | map->m_flags |= EXT4_MAP_UNWRITTEN; |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4064 | goto map_out; |
Zheng Liu | a25a4e1 | 2013-02-18 00:28:04 -0500 | [diff] [blame] | 4065 | } |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4066 | |
| 4067 | /* buffered READ or buffered write_begin() lookup */ |
| 4068 | if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) { |
| 4069 | /* |
| 4070 | * We have blocks reserved already. We |
| 4071 | * return allocated blocks so that delalloc |
| 4072 | * won't do block reservation for us. But |
| 4073 | * the buffer head will be unmapped so that |
| 4074 | * a read from the block returns 0s. |
| 4075 | */ |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4076 | map->m_flags |= EXT4_MAP_UNWRITTEN; |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4077 | goto out1; |
| 4078 | } |
| 4079 | |
| 4080 | /* buffered write, writepage time, convert*/ |
Lukas Czerner | 27dd438 | 2013-04-09 22:11:22 -0400 | [diff] [blame] | 4081 | ret = ext4_ext_convert_to_initialized(handle, inode, map, path, flags); |
Dmitry Monakhov | a4e5d88 | 2011-10-25 08:15:12 -0400 | [diff] [blame] | 4082 | if (ret >= 0) |
Jan Kara | b436b9b | 2009-12-08 23:51:10 -0500 | [diff] [blame] | 4083 | ext4_update_inode_fsync_trans(handle, inode, 1); |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4084 | out: |
| 4085 | if (ret <= 0) { |
| 4086 | err = ret; |
| 4087 | goto out2; |
| 4088 | } else |
| 4089 | allocated = ret; |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4090 | map->m_flags |= EXT4_MAP_NEW; |
Aneesh Kumar K.V | 515f41c | 2009-12-29 23:39:06 -0500 | [diff] [blame] | 4091 | /* |
| 4092 | * if we allocated more blocks than requested |
| 4093 | * we need to make sure we unmap the extra block |
| 4094 | * allocated. The actual needed block will get |
| 4095 | * unmapped later when we find the buffer_head marked |
| 4096 | * new. |
| 4097 | */ |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4098 | if (allocated > map->m_len) { |
Aneesh Kumar K.V | 515f41c | 2009-12-29 23:39:06 -0500 | [diff] [blame] | 4099 | unmap_underlying_metadata_blocks(inode->i_sb->s_bdev, |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4100 | newblock + map->m_len, |
| 4101 | allocated - map->m_len); |
| 4102 | allocated = map->m_len; |
Aneesh Kumar K.V | 515f41c | 2009-12-29 23:39:06 -0500 | [diff] [blame] | 4103 | } |
Zheng Liu | 3a22567 | 2013-03-10 21:20:23 -0400 | [diff] [blame] | 4104 | map->m_len = allocated; |
Aneesh Kumar K.V | 5f634d0 | 2010-01-25 04:00:31 -0500 | [diff] [blame] | 4105 | |
| 4106 | /* |
| 4107 | * If we have done fallocate with the offset that is already |
| 4108 | * delayed allocated, we would have block reservation |
| 4109 | * and quota reservation done in the delayed write path. |
| 4110 | * But fallocate would have already updated quota and block |
| 4111 | * count for this offset. So cancel these reservation |
| 4112 | */ |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 4113 | if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) { |
| 4114 | unsigned int reserved_clusters; |
| 4115 | reserved_clusters = get_reserved_cluster_alloc(inode, |
| 4116 | map->m_lblk, map->m_len); |
| 4117 | if (reserved_clusters) |
| 4118 | ext4_da_update_reserve_space(inode, |
| 4119 | reserved_clusters, |
| 4120 | 0); |
| 4121 | } |
Aneesh Kumar K.V | 5f634d0 | 2010-01-25 04:00:31 -0500 | [diff] [blame] | 4122 | |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4123 | map_out: |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4124 | map->m_flags |= EXT4_MAP_MAPPED; |
Dmitry Monakhov | a4e5d88 | 2011-10-25 08:15:12 -0400 | [diff] [blame] | 4125 | if ((flags & EXT4_GET_BLOCKS_KEEP_SIZE) == 0) { |
| 4126 | err = check_eofblocks_fl(handle, inode, map->m_lblk, path, |
| 4127 | map->m_len); |
| 4128 | if (err < 0) |
| 4129 | goto out2; |
| 4130 | } |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4131 | out1: |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4132 | if (allocated > map->m_len) |
| 4133 | allocated = map->m_len; |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4134 | ext4_ext_show_leaf(inode, path); |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4135 | map->m_pblk = newblock; |
| 4136 | map->m_len = allocated; |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4137 | out2: |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4138 | return err ? err : allocated; |
| 4139 | } |
Theodore Ts'o | 58590b0 | 2010-10-27 21:23:12 -0400 | [diff] [blame] | 4140 | |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4141 | /* |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4142 | * get_implied_cluster_alloc - check to see if the requested |
| 4143 | * allocation (in the map structure) overlaps with a cluster already |
| 4144 | * allocated in an extent. |
Aditya Kali | d899024 | 2011-09-09 19:18:51 -0400 | [diff] [blame] | 4145 | * @sb The filesystem superblock structure |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4146 | * @map The requested lblk->pblk mapping |
| 4147 | * @ex The extent structure which might contain an implied |
| 4148 | * cluster allocation |
| 4149 | * |
| 4150 | * This function is called by ext4_ext_map_blocks() after we failed to |
| 4151 | * find blocks that were already in the inode's extent tree. Hence, |
| 4152 | * we know that the beginning of the requested region cannot overlap |
| 4153 | * the extent from the inode's extent tree. There are three cases we |
| 4154 | * want to catch. The first is this case: |
| 4155 | * |
| 4156 | * |--- cluster # N--| |
| 4157 | * |--- extent ---| |---- requested region ---| |
| 4158 | * |==========| |
| 4159 | * |
| 4160 | * The second case that we need to test for is this one: |
| 4161 | * |
| 4162 | * |--------- cluster # N ----------------| |
| 4163 | * |--- requested region --| |------- extent ----| |
| 4164 | * |=======================| |
| 4165 | * |
| 4166 | * The third case is when the requested region lies between two extents |
| 4167 | * within the same cluster: |
| 4168 | * |------------- cluster # N-------------| |
| 4169 | * |----- ex -----| |---- ex_right ----| |
| 4170 | * |------ requested region ------| |
| 4171 | * |================| |
| 4172 | * |
| 4173 | * In each of the above cases, we need to set the map->m_pblk and |
| 4174 | * map->m_len so it corresponds to the return the extent labelled as |
| 4175 | * "|====|" from cluster #N, since it is already in use for data in |
| 4176 | * cluster EXT4_B2C(sbi, map->m_lblk). We will then return 1 to |
| 4177 | * signal to ext4_ext_map_blocks() that map->m_pblk should be treated |
| 4178 | * as a new "allocated" block region. Otherwise, we will return 0 and |
| 4179 | * ext4_ext_map_blocks() will then allocate one or more new clusters |
| 4180 | * by calling ext4_mb_new_blocks(). |
| 4181 | */ |
Aditya Kali | d899024 | 2011-09-09 19:18:51 -0400 | [diff] [blame] | 4182 | static int get_implied_cluster_alloc(struct super_block *sb, |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4183 | struct ext4_map_blocks *map, |
| 4184 | struct ext4_extent *ex, |
| 4185 | struct ext4_ext_path *path) |
| 4186 | { |
Aditya Kali | d899024 | 2011-09-09 19:18:51 -0400 | [diff] [blame] | 4187 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
Theodore Ts'o | f5a44db | 2013-12-20 09:29:35 -0500 | [diff] [blame] | 4188 | ext4_lblk_t c_offset = EXT4_LBLK_COFF(sbi, map->m_lblk); |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4189 | ext4_lblk_t ex_cluster_start, ex_cluster_end; |
Curt Wohlgemuth | 14d7f3e | 2011-12-18 17:39:02 -0500 | [diff] [blame] | 4190 | ext4_lblk_t rr_cluster_start; |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4191 | ext4_lblk_t ee_block = le32_to_cpu(ex->ee_block); |
| 4192 | ext4_fsblk_t ee_start = ext4_ext_pblock(ex); |
| 4193 | unsigned short ee_len = ext4_ext_get_actual_len(ex); |
| 4194 | |
| 4195 | /* The extent passed in that we are trying to match */ |
| 4196 | ex_cluster_start = EXT4_B2C(sbi, ee_block); |
| 4197 | ex_cluster_end = EXT4_B2C(sbi, ee_block + ee_len - 1); |
| 4198 | |
| 4199 | /* The requested region passed into ext4_map_blocks() */ |
| 4200 | rr_cluster_start = EXT4_B2C(sbi, map->m_lblk); |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4201 | |
| 4202 | if ((rr_cluster_start == ex_cluster_end) || |
| 4203 | (rr_cluster_start == ex_cluster_start)) { |
| 4204 | if (rr_cluster_start == ex_cluster_end) |
| 4205 | ee_start += ee_len - 1; |
Theodore Ts'o | f5a44db | 2013-12-20 09:29:35 -0500 | [diff] [blame] | 4206 | map->m_pblk = EXT4_PBLK_CMASK(sbi, ee_start) + c_offset; |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4207 | map->m_len = min(map->m_len, |
| 4208 | (unsigned) sbi->s_cluster_ratio - c_offset); |
| 4209 | /* |
| 4210 | * Check for and handle this case: |
| 4211 | * |
| 4212 | * |--------- cluster # N-------------| |
| 4213 | * |------- extent ----| |
| 4214 | * |--- requested region ---| |
| 4215 | * |===========| |
| 4216 | */ |
| 4217 | |
| 4218 | if (map->m_lblk < ee_block) |
| 4219 | map->m_len = min(map->m_len, ee_block - map->m_lblk); |
| 4220 | |
| 4221 | /* |
| 4222 | * Check for the case where there is already another allocated |
| 4223 | * block to the right of 'ex' but before the end of the cluster. |
| 4224 | * |
| 4225 | * |------------- cluster # N-------------| |
| 4226 | * |----- ex -----| |---- ex_right ----| |
| 4227 | * |------ requested region ------| |
| 4228 | * |================| |
| 4229 | */ |
| 4230 | if (map->m_lblk > ee_block) { |
| 4231 | ext4_lblk_t next = ext4_ext_next_allocated_block(path); |
| 4232 | map->m_len = min(map->m_len, next - map->m_lblk); |
| 4233 | } |
Aditya Kali | d899024 | 2011-09-09 19:18:51 -0400 | [diff] [blame] | 4234 | |
| 4235 | trace_ext4_get_implied_cluster_alloc_exit(sb, map, 1); |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4236 | return 1; |
| 4237 | } |
Aditya Kali | d899024 | 2011-09-09 19:18:51 -0400 | [diff] [blame] | 4238 | |
| 4239 | trace_ext4_get_implied_cluster_alloc_exit(sb, map, 0); |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4240 | return 0; |
| 4241 | } |
| 4242 | |
| 4243 | |
| 4244 | /* |
Mingming Cao | f5ab0d1 | 2008-02-25 15:29:55 -0500 | [diff] [blame] | 4245 | * Block allocation/map/preallocation routine for extents based files |
| 4246 | * |
| 4247 | * |
Aneesh Kumar K.V | c278bfe | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 4248 | * Need to be called with |
Aneesh Kumar K.V | 0e855ac | 2008-01-28 23:58:26 -0500 | [diff] [blame] | 4249 | * down_read(&EXT4_I(inode)->i_data_sem) if not allocating file system block |
| 4250 | * (ie, create is zero). Otherwise down_write(&EXT4_I(inode)->i_data_sem) |
Mingming Cao | f5ab0d1 | 2008-02-25 15:29:55 -0500 | [diff] [blame] | 4251 | * |
| 4252 | * return > 0, number of of blocks already mapped/allocated |
| 4253 | * if create == 0 and these are pre-allocated blocks |
| 4254 | * buffer head is unmapped |
| 4255 | * otherwise blocks are mapped |
| 4256 | * |
| 4257 | * return = 0, if plain look up failed (blocks have not been allocated) |
| 4258 | * buffer head is unmapped |
| 4259 | * |
| 4260 | * return < 0, error case. |
Aneesh Kumar K.V | c278bfe | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 4261 | */ |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4262 | int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, |
| 4263 | struct ext4_map_blocks *map, int flags) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4264 | { |
| 4265 | struct ext4_ext_path *path = NULL; |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4266 | struct ext4_extent newex, *ex, *ex2; |
| 4267 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
Jiaying Zhang | 0562e0b | 2011-03-21 21:38:05 -0400 | [diff] [blame] | 4268 | ext4_fsblk_t newblock = 0; |
Eric Whitney | ce37c42 | 2014-02-19 18:52:39 -0500 | [diff] [blame] | 4269 | int free_on_err = 0, err = 0, depth, ret; |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4270 | unsigned int allocated = 0, offset = 0; |
Yongqiang Yang | 81fdbb4 | 2011-10-29 09:23:38 -0400 | [diff] [blame] | 4271 | unsigned int allocated_clusters = 0; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4272 | struct ext4_allocation_request ar; |
Dmitry Monakhov | f45ee3a | 2012-09-28 23:21:09 -0400 | [diff] [blame] | 4273 | ext4_io_end_t *io = ext4_inode_aio(inode); |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4274 | ext4_lblk_t cluster_offset; |
Dmitry Monakhov | 82e5422 | 2012-09-28 23:36:25 -0400 | [diff] [blame] | 4275 | int set_unwritten = 0; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4276 | |
Mingming | 84fe3be | 2009-09-01 08:44:37 -0400 | [diff] [blame] | 4277 | ext_debug("blocks %u/%u requested for inode %lu\n", |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4278 | map->m_lblk, map->m_len, inode->i_ino); |
Jiaying Zhang | 0562e0b | 2011-03-21 21:38:05 -0400 | [diff] [blame] | 4279 | trace_ext4_ext_map_blocks_enter(inode, map->m_lblk, map->m_len, flags); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4280 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4281 | /* find extent for this block */ |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 4282 | path = ext4_ext_find_extent(inode, map->m_lblk, NULL, 0); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4283 | if (IS_ERR(path)) { |
| 4284 | err = PTR_ERR(path); |
| 4285 | path = NULL; |
| 4286 | goto out2; |
| 4287 | } |
| 4288 | |
| 4289 | depth = ext_depth(inode); |
| 4290 | |
| 4291 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 4292 | * consistent leaf must not be empty; |
| 4293 | * this situation is possible, though, _during_ tree modification; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4294 | * this is why assert can't be put in ext4_ext_find_extent() |
| 4295 | */ |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 4296 | if (unlikely(path[depth].p_ext == NULL && depth != 0)) { |
| 4297 | EXT4_ERROR_INODE(inode, "bad extent address " |
Theodore Ts'o | f70f362 | 2010-05-16 23:00:00 -0400 | [diff] [blame] | 4298 | "lblock: %lu, depth: %d pblock %lld", |
| 4299 | (unsigned long) map->m_lblk, depth, |
| 4300 | path[depth].p_block); |
Surbhi Palande | 034fb4c | 2009-12-14 09:53:52 -0500 | [diff] [blame] | 4301 | err = -EIO; |
| 4302 | goto out2; |
| 4303 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4304 | |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 4305 | ex = path[depth].p_ext; |
| 4306 | if (ex) { |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 4307 | ext4_lblk_t ee_block = le32_to_cpu(ex->ee_block); |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 4308 | ext4_fsblk_t ee_start = ext4_ext_pblock(ex); |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4309 | unsigned short ee_len; |
Suparna Bhattacharya | 471d401 | 2006-10-11 01:21:06 -0700 | [diff] [blame] | 4310 | |
Lukas Czerner | b8a8684 | 2014-03-18 18:05:35 -0400 | [diff] [blame] | 4311 | |
Suparna Bhattacharya | 471d401 | 2006-10-11 01:21:06 -0700 | [diff] [blame] | 4312 | /* |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 4313 | * unwritten extents are treated as holes, except that |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 4314 | * we split out initialized portions during a write. |
Suparna Bhattacharya | 471d401 | 2006-10-11 01:21:06 -0700 | [diff] [blame] | 4315 | */ |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4316 | ee_len = ext4_ext_get_actual_len(ex); |
Aditya Kali | d899024 | 2011-09-09 19:18:51 -0400 | [diff] [blame] | 4317 | |
| 4318 | trace_ext4_ext_show_extent(inode, ee_block, ee_start, ee_len); |
| 4319 | |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 4320 | /* if found extent covers block, simply return it */ |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4321 | if (in_range(map->m_lblk, ee_block, ee_len)) { |
| 4322 | newblock = map->m_lblk - ee_block + ee_start; |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 4323 | /* number of remaining blocks in the extent */ |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4324 | allocated = ee_len - (map->m_lblk - ee_block); |
| 4325 | ext_debug("%u fit into %u:%d -> %llu\n", map->m_lblk, |
| 4326 | ee_block, ee_len, newblock); |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 4327 | |
Lukas Czerner | b8a8684 | 2014-03-18 18:05:35 -0400 | [diff] [blame] | 4328 | /* |
| 4329 | * If the extent is initialized check whether the |
| 4330 | * caller wants to convert it to unwritten. |
| 4331 | */ |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 4332 | if ((!ext4_ext_is_unwritten(ex)) && |
Lukas Czerner | b8a8684 | 2014-03-18 18:05:35 -0400 | [diff] [blame] | 4333 | (flags & EXT4_GET_BLOCKS_CONVERT_UNWRITTEN)) { |
| 4334 | allocated = ext4_ext_convert_initialized_extent( |
| 4335 | handle, inode, map, path, flags, |
| 4336 | allocated, newblock); |
| 4337 | goto out2; |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 4338 | } else if (!ext4_ext_is_unwritten(ex)) |
Lukas Czerner | 7877191 | 2012-03-19 23:05:43 -0400 | [diff] [blame] | 4339 | goto out; |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 4340 | |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 4341 | ret = ext4_ext_handle_unwritten_extents( |
Lukas Czerner | 7877191 | 2012-03-19 23:05:43 -0400 | [diff] [blame] | 4342 | handle, inode, map, path, flags, |
| 4343 | allocated, newblock); |
Eric Whitney | ce37c42 | 2014-02-19 18:52:39 -0500 | [diff] [blame] | 4344 | if (ret < 0) |
| 4345 | err = ret; |
| 4346 | else |
| 4347 | allocated = ret; |
Eric Whitney | 31cf0f2 | 2014-03-13 23:14:46 -0400 | [diff] [blame] | 4348 | goto out2; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4349 | } |
| 4350 | } |
| 4351 | |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 4352 | if ((sbi->s_cluster_ratio > 1) && |
Zheng Liu | 7d1b1fb | 2012-11-08 21:57:35 -0500 | [diff] [blame] | 4353 | ext4_find_delalloc_cluster(inode, map->m_lblk)) |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 4354 | map->m_flags |= EXT4_MAP_FROM_CLUSTER; |
| 4355 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4356 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 4357 | * requested block isn't allocated yet; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4358 | * we couldn't try to create block if create flag is zero |
| 4359 | */ |
Theodore Ts'o | c217705 | 2009-05-14 00:58:52 -0400 | [diff] [blame] | 4360 | if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) { |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 4361 | /* |
| 4362 | * put just found gap into cache to speed up |
| 4363 | * subsequent requests |
| 4364 | */ |
Zheng Liu | d100eef | 2013-02-18 00:29:59 -0500 | [diff] [blame] | 4365 | if ((flags & EXT4_GET_BLOCKS_NO_PUT_HOLE) == 0) |
| 4366 | ext4_ext_put_gap_in_cache(inode, path, map->m_lblk); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4367 | goto out2; |
| 4368 | } |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4369 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4370 | /* |
Theodore Ts'o | c2ea3fd | 2008-10-10 09:40:52 -0400 | [diff] [blame] | 4371 | * Okay, we need to do block allocation. |
Andrew Morton | 63f5793 | 2006-10-11 01:21:24 -0700 | [diff] [blame] | 4372 | */ |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 4373 | map->m_flags &= ~EXT4_MAP_FROM_CLUSTER; |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4374 | newex.ee_block = cpu_to_le32(map->m_lblk); |
Eric Whitney | d0abafa | 2014-01-06 14:00:23 -0500 | [diff] [blame] | 4375 | cluster_offset = EXT4_LBLK_COFF(sbi, map->m_lblk); |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4376 | |
| 4377 | /* |
| 4378 | * If we are doing bigalloc, check to see if the extent returned |
| 4379 | * by ext4_ext_find_extent() implies a cluster we can use. |
| 4380 | */ |
| 4381 | if (cluster_offset && ex && |
Aditya Kali | d899024 | 2011-09-09 19:18:51 -0400 | [diff] [blame] | 4382 | get_implied_cluster_alloc(inode->i_sb, map, ex, path)) { |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4383 | ar.len = allocated = map->m_len; |
| 4384 | newblock = map->m_pblk; |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 4385 | map->m_flags |= EXT4_MAP_FROM_CLUSTER; |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4386 | goto got_allocated_blocks; |
| 4387 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4388 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4389 | /* find neighbour allocated blocks */ |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4390 | ar.lleft = map->m_lblk; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4391 | err = ext4_ext_search_left(inode, path, &ar.lleft, &ar.pleft); |
| 4392 | if (err) |
| 4393 | goto out2; |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4394 | ar.lright = map->m_lblk; |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4395 | ex2 = NULL; |
| 4396 | err = ext4_ext_search_right(inode, path, &ar.lright, &ar.pright, &ex2); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4397 | if (err) |
| 4398 | goto out2; |
Amit Arora | 25d14f9 | 2007-05-24 13:04:13 -0400 | [diff] [blame] | 4399 | |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4400 | /* Check if the extent after searching to the right implies a |
| 4401 | * cluster we can use. */ |
| 4402 | if ((sbi->s_cluster_ratio > 1) && ex2 && |
Aditya Kali | d899024 | 2011-09-09 19:18:51 -0400 | [diff] [blame] | 4403 | get_implied_cluster_alloc(inode->i_sb, map, ex2, path)) { |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4404 | ar.len = allocated = map->m_len; |
| 4405 | newblock = map->m_pblk; |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 4406 | map->m_flags |= EXT4_MAP_FROM_CLUSTER; |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4407 | goto got_allocated_blocks; |
| 4408 | } |
| 4409 | |
Amit Arora | 749269f | 2007-07-18 09:02:56 -0400 | [diff] [blame] | 4410 | /* |
| 4411 | * See if request is beyond maximum number of blocks we can have in |
| 4412 | * a single extent. For an initialized extent this limit is |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 4413 | * EXT_INIT_MAX_LEN and for an unwritten extent this limit is |
| 4414 | * EXT_UNWRITTEN_MAX_LEN. |
Amit Arora | 749269f | 2007-07-18 09:02:56 -0400 | [diff] [blame] | 4415 | */ |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4416 | if (map->m_len > EXT_INIT_MAX_LEN && |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 4417 | !(flags & EXT4_GET_BLOCKS_UNWRIT_EXT)) |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4418 | map->m_len = EXT_INIT_MAX_LEN; |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 4419 | else if (map->m_len > EXT_UNWRITTEN_MAX_LEN && |
| 4420 | (flags & EXT4_GET_BLOCKS_UNWRIT_EXT)) |
| 4421 | map->m_len = EXT_UNWRITTEN_MAX_LEN; |
Amit Arora | 749269f | 2007-07-18 09:02:56 -0400 | [diff] [blame] | 4422 | |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4423 | /* Check if we can really insert (m_lblk)::(m_lblk + m_len) extent */ |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4424 | newex.ee_len = cpu_to_le16(map->m_len); |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4425 | err = ext4_ext_check_overlap(sbi, inode, &newex, path); |
Amit Arora | 25d14f9 | 2007-05-24 13:04:13 -0400 | [diff] [blame] | 4426 | if (err) |
Aneesh Kumar K.V | b939e37 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 4427 | allocated = ext4_ext_get_actual_len(&newex); |
Amit Arora | 25d14f9 | 2007-05-24 13:04:13 -0400 | [diff] [blame] | 4428 | else |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4429 | allocated = map->m_len; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4430 | |
| 4431 | /* allocate new block */ |
| 4432 | ar.inode = inode; |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4433 | ar.goal = ext4_ext_find_goal(inode, path, map->m_lblk); |
| 4434 | ar.logical = map->m_lblk; |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4435 | /* |
| 4436 | * We calculate the offset from the beginning of the cluster |
| 4437 | * for the logical block number, since when we allocate a |
| 4438 | * physical cluster, the physical block should start at the |
| 4439 | * same offset from the beginning of the cluster. This is |
| 4440 | * needed so that future calls to get_implied_cluster_alloc() |
| 4441 | * work correctly. |
| 4442 | */ |
Theodore Ts'o | f5a44db | 2013-12-20 09:29:35 -0500 | [diff] [blame] | 4443 | offset = EXT4_LBLK_COFF(sbi, map->m_lblk); |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4444 | ar.len = EXT4_NUM_B2C(sbi, offset+allocated); |
| 4445 | ar.goal -= offset; |
| 4446 | ar.logical -= offset; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4447 | if (S_ISREG(inode->i_mode)) |
| 4448 | ar.flags = EXT4_MB_HINT_DATA; |
| 4449 | else |
| 4450 | /* disable in-core preallocation for non-regular files */ |
| 4451 | ar.flags = 0; |
Vivek Haldar | 556b27a | 2011-05-25 07:41:54 -0400 | [diff] [blame] | 4452 | if (flags & EXT4_GET_BLOCKS_NO_NORMALIZE) |
| 4453 | ar.flags |= EXT4_MB_HINT_NOPREALLOC; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4454 | newblock = ext4_mb_new_blocks(handle, &ar, &err); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4455 | if (!newblock) |
| 4456 | goto out2; |
Mingming | 84fe3be | 2009-09-01 08:44:37 -0400 | [diff] [blame] | 4457 | ext_debug("allocate new block: goal %llu, found %llu/%u\n", |
Theodore Ts'o | 498e5f2 | 2008-11-05 00:14:04 -0500 | [diff] [blame] | 4458 | ar.goal, newblock, allocated); |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4459 | free_on_err = 1; |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 4460 | allocated_clusters = ar.len; |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4461 | ar.len = EXT4_C2B(sbi, ar.len) - offset; |
| 4462 | if (ar.len > allocated) |
| 4463 | ar.len = allocated; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4464 | |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4465 | got_allocated_blocks: |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4466 | /* try to insert new extent into found leaf and return */ |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4467 | ext4_ext_store_pblock(&newex, newblock + offset); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4468 | newex.ee_len = cpu_to_le16(ar.len); |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 4469 | /* Mark unwritten */ |
| 4470 | if (flags & EXT4_GET_BLOCKS_UNWRIT_EXT){ |
| 4471 | ext4_ext_mark_unwritten(&newex); |
Zheng Liu | a25a4e1 | 2013-02-18 00:28:04 -0500 | [diff] [blame] | 4472 | map->m_flags |= EXT4_MAP_UNWRITTEN; |
Mingming Cao | 8d5d02e | 2009-09-28 15:48:29 -0400 | [diff] [blame] | 4473 | /* |
Jiaying Zhang | 744692d | 2010-03-04 16:14:02 -0500 | [diff] [blame] | 4474 | * io_end structure was created for every IO write to an |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 4475 | * unwritten extent. To avoid unnecessary conversion, |
Jiaying Zhang | 744692d | 2010-03-04 16:14:02 -0500 | [diff] [blame] | 4476 | * here we flag the IO that really needs the conversion. |
Mingming | 5f52495 | 2009-11-10 10:48:04 -0500 | [diff] [blame] | 4477 | * For non asycn direct IO case, flag the inode state |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 4478 | * that we need to perform conversion when IO is done. |
Mingming Cao | 8d5d02e | 2009-09-28 15:48:29 -0400 | [diff] [blame] | 4479 | */ |
Lukas Czerner | c8b459f | 2014-05-12 12:55:07 -0400 | [diff] [blame] | 4480 | if (flags & EXT4_GET_BLOCKS_PRE_IO) |
Dmitry Monakhov | 82e5422 | 2012-09-28 23:36:25 -0400 | [diff] [blame] | 4481 | set_unwritten = 1; |
Mingming Cao | 8d5d02e | 2009-09-28 15:48:29 -0400 | [diff] [blame] | 4482 | } |
Jiaying Zhang | c8d46e4 | 2010-02-24 09:52:53 -0500 | [diff] [blame] | 4483 | |
Dmitry Monakhov | a4e5d88 | 2011-10-25 08:15:12 -0400 | [diff] [blame] | 4484 | err = 0; |
| 4485 | if ((flags & EXT4_GET_BLOCKS_KEEP_SIZE) == 0) |
| 4486 | err = check_eofblocks_fl(handle, inode, map->m_lblk, |
| 4487 | path, ar.len); |
Jiaying Zhang | 575a1d4 | 2011-07-10 20:07:25 -0400 | [diff] [blame] | 4488 | if (!err) |
| 4489 | err = ext4_ext_insert_extent(handle, inode, path, |
| 4490 | &newex, flags); |
Dmitry Monakhov | 82e5422 | 2012-09-28 23:36:25 -0400 | [diff] [blame] | 4491 | |
| 4492 | if (!err && set_unwritten) { |
| 4493 | if (io) |
| 4494 | ext4_set_io_unwritten_flag(inode, io); |
| 4495 | else |
| 4496 | ext4_set_inode_state(inode, |
| 4497 | EXT4_STATE_DIO_UNWRITTEN); |
| 4498 | } |
| 4499 | |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4500 | if (err && free_on_err) { |
Maxim Patlasov | 7132de7 | 2011-07-10 19:37:48 -0400 | [diff] [blame] | 4501 | int fb_flags = flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE ? |
| 4502 | EXT4_FREE_BLOCKS_NO_QUOT_UPDATE : 0; |
Alex Tomas | 315054f | 2007-05-24 13:04:25 -0400 | [diff] [blame] | 4503 | /* free data blocks we just allocated */ |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4504 | /* not a good idea to call discard here directly, |
| 4505 | * but otherwise we'd need to call it every free() */ |
Theodore Ts'o | c2ea3fd | 2008-10-10 09:40:52 -0400 | [diff] [blame] | 4506 | ext4_discard_preallocations(inode); |
Theodore Ts'o | c8e1513 | 2013-07-15 00:09:37 -0400 | [diff] [blame] | 4507 | ext4_free_blocks(handle, inode, NULL, newblock, |
| 4508 | EXT4_C2B(sbi, allocated_clusters), fb_flags); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4509 | goto out2; |
Alex Tomas | 315054f | 2007-05-24 13:04:25 -0400 | [diff] [blame] | 4510 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4511 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4512 | /* previous routine could use block we allocated */ |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 4513 | newblock = ext4_ext_pblock(&newex); |
Aneesh Kumar K.V | b939e37 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 4514 | allocated = ext4_ext_get_actual_len(&newex); |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4515 | if (allocated > map->m_len) |
| 4516 | allocated = map->m_len; |
| 4517 | map->m_flags |= EXT4_MAP_NEW; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4518 | |
Jan Kara | b436b9b | 2009-12-08 23:51:10 -0500 | [diff] [blame] | 4519 | /* |
Aneesh Kumar K.V | 5f634d0 | 2010-01-25 04:00:31 -0500 | [diff] [blame] | 4520 | * Update reserved blocks/metadata blocks after successful |
| 4521 | * block allocation which had been deferred till now. |
| 4522 | */ |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 4523 | if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) { |
Yongqiang Yang | 81fdbb4 | 2011-10-29 09:23:38 -0400 | [diff] [blame] | 4524 | unsigned int reserved_clusters; |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 4525 | /* |
Yongqiang Yang | 81fdbb4 | 2011-10-29 09:23:38 -0400 | [diff] [blame] | 4526 | * Check how many clusters we had reserved this allocated range |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 4527 | */ |
| 4528 | reserved_clusters = get_reserved_cluster_alloc(inode, |
| 4529 | map->m_lblk, allocated); |
| 4530 | if (map->m_flags & EXT4_MAP_FROM_CLUSTER) { |
| 4531 | if (reserved_clusters) { |
| 4532 | /* |
| 4533 | * We have clusters reserved for this range. |
| 4534 | * But since we are not doing actual allocation |
| 4535 | * and are simply using blocks from previously |
| 4536 | * allocated cluster, we should release the |
| 4537 | * reservation and not claim quota. |
| 4538 | */ |
| 4539 | ext4_da_update_reserve_space(inode, |
| 4540 | reserved_clusters, 0); |
| 4541 | } |
| 4542 | } else { |
| 4543 | BUG_ON(allocated_clusters < reserved_clusters); |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 4544 | if (reserved_clusters < allocated_clusters) { |
Aditya Kali | 5356f26 | 2011-09-09 19:20:51 -0400 | [diff] [blame] | 4545 | struct ext4_inode_info *ei = EXT4_I(inode); |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 4546 | int reservation = allocated_clusters - |
| 4547 | reserved_clusters; |
| 4548 | /* |
| 4549 | * It seems we claimed few clusters outside of |
| 4550 | * the range of this allocation. We should give |
| 4551 | * it back to the reservation pool. This can |
| 4552 | * happen in the following case: |
| 4553 | * |
| 4554 | * * Suppose s_cluster_ratio is 4 (i.e., each |
| 4555 | * cluster has 4 blocks. Thus, the clusters |
| 4556 | * are [0-3],[4-7],[8-11]... |
| 4557 | * * First comes delayed allocation write for |
| 4558 | * logical blocks 10 & 11. Since there were no |
| 4559 | * previous delayed allocated blocks in the |
| 4560 | * range [8-11], we would reserve 1 cluster |
| 4561 | * for this write. |
| 4562 | * * Next comes write for logical blocks 3 to 8. |
| 4563 | * In this case, we will reserve 2 clusters |
| 4564 | * (for [0-3] and [4-7]; and not for [8-11] as |
| 4565 | * that range has a delayed allocated blocks. |
| 4566 | * Thus total reserved clusters now becomes 3. |
| 4567 | * * Now, during the delayed allocation writeout |
| 4568 | * time, we will first write blocks [3-8] and |
| 4569 | * allocate 3 clusters for writing these |
| 4570 | * blocks. Also, we would claim all these |
| 4571 | * three clusters above. |
| 4572 | * * Now when we come here to writeout the |
| 4573 | * blocks [10-11], we would expect to claim |
| 4574 | * the reservation of 1 cluster we had made |
| 4575 | * (and we would claim it since there are no |
| 4576 | * more delayed allocated blocks in the range |
| 4577 | * [8-11]. But our reserved cluster count had |
| 4578 | * already gone to 0. |
| 4579 | * |
| 4580 | * Thus, at the step 4 above when we determine |
| 4581 | * that there are still some unwritten delayed |
| 4582 | * allocated blocks outside of our current |
| 4583 | * block range, we should increment the |
| 4584 | * reserved clusters count so that when the |
| 4585 | * remaining blocks finally gets written, we |
| 4586 | * could claim them. |
| 4587 | */ |
Aditya Kali | 5356f26 | 2011-09-09 19:20:51 -0400 | [diff] [blame] | 4588 | dquot_reserve_block(inode, |
| 4589 | EXT4_C2B(sbi, reservation)); |
| 4590 | spin_lock(&ei->i_block_reservation_lock); |
| 4591 | ei->i_reserved_data_blocks += reservation; |
| 4592 | spin_unlock(&ei->i_block_reservation_lock); |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 4593 | } |
Lukas Czerner | 232ec87 | 2013-03-10 22:46:30 -0400 | [diff] [blame] | 4594 | /* |
| 4595 | * We will claim quota for all newly allocated blocks. |
| 4596 | * We're updating the reserved space *after* the |
| 4597 | * correction above so we do not accidentally free |
| 4598 | * all the metadata reservation because we might |
| 4599 | * actually need it later on. |
| 4600 | */ |
| 4601 | ext4_da_update_reserve_space(inode, allocated_clusters, |
| 4602 | 1); |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 4603 | } |
| 4604 | } |
Aneesh Kumar K.V | 5f634d0 | 2010-01-25 04:00:31 -0500 | [diff] [blame] | 4605 | |
| 4606 | /* |
Jan Kara | b436b9b | 2009-12-08 23:51:10 -0500 | [diff] [blame] | 4607 | * Cache the extent and update transaction to commit on fdatasync only |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 4608 | * when it is _not_ an unwritten extent. |
Jan Kara | b436b9b | 2009-12-08 23:51:10 -0500 | [diff] [blame] | 4609 | */ |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 4610 | if ((flags & EXT4_GET_BLOCKS_UNWRIT_EXT) == 0) |
Jan Kara | b436b9b | 2009-12-08 23:51:10 -0500 | [diff] [blame] | 4611 | ext4_update_inode_fsync_trans(handle, inode, 1); |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 4612 | else |
Jan Kara | b436b9b | 2009-12-08 23:51:10 -0500 | [diff] [blame] | 4613 | ext4_update_inode_fsync_trans(handle, inode, 0); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4614 | out: |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4615 | if (allocated > map->m_len) |
| 4616 | allocated = map->m_len; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4617 | ext4_ext_show_leaf(inode, path); |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4618 | map->m_flags |= EXT4_MAP_MAPPED; |
| 4619 | map->m_pblk = newblock; |
| 4620 | map->m_len = allocated; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4621 | out2: |
| 4622 | if (path) { |
| 4623 | ext4_ext_drop_refs(path); |
| 4624 | kfree(path); |
| 4625 | } |
Allison Henderson | e861304 | 2011-05-25 07:41:46 -0400 | [diff] [blame] | 4626 | |
Theodore Ts'o | 63b9996 | 2013-07-16 10:28:47 -0400 | [diff] [blame] | 4627 | trace_ext4_ext_map_blocks_exit(inode, flags, map, |
| 4628 | err ? err : allocated); |
| 4629 | ext4_es_lru_add(inode); |
Lukas Czerner | 7877191 | 2012-03-19 23:05:43 -0400 | [diff] [blame] | 4630 | return err ? err : allocated; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4631 | } |
| 4632 | |
Theodore Ts'o | 819c492 | 2013-04-03 12:47:17 -0400 | [diff] [blame] | 4633 | void ext4_ext_truncate(handle_t *handle, struct inode *inode) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4634 | { |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4635 | struct super_block *sb = inode->i_sb; |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 4636 | ext4_lblk_t last_block; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4637 | int err = 0; |
| 4638 | |
| 4639 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 4640 | * TODO: optimization is possible here. |
| 4641 | * Probably we need not scan at all, |
| 4642 | * because page truncation is enough. |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4643 | */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4644 | |
| 4645 | /* we have to know where to truncate from in crash case */ |
| 4646 | EXT4_I(inode)->i_disksize = inode->i_size; |
| 4647 | ext4_mark_inode_dirty(handle, inode); |
| 4648 | |
| 4649 | last_block = (inode->i_size + sb->s_blocksize - 1) |
| 4650 | >> EXT4_BLOCK_SIZE_BITS(sb); |
Theodore Ts'o | 8acd5e9 | 2013-07-15 00:09:19 -0400 | [diff] [blame] | 4651 | retry: |
Zheng Liu | 51865fd | 2012-11-08 21:57:32 -0500 | [diff] [blame] | 4652 | err = ext4_es_remove_extent(inode, last_block, |
| 4653 | EXT_MAX_BLOCKS - last_block); |
Theodore Ts'o | 94eec0f | 2013-07-29 12:12:56 -0400 | [diff] [blame] | 4654 | if (err == -ENOMEM) { |
Theodore Ts'o | 8acd5e9 | 2013-07-15 00:09:19 -0400 | [diff] [blame] | 4655 | cond_resched(); |
| 4656 | congestion_wait(BLK_RW_ASYNC, HZ/50); |
| 4657 | goto retry; |
| 4658 | } |
| 4659 | if (err) { |
| 4660 | ext4_std_error(inode->i_sb, err); |
| 4661 | return; |
| 4662 | } |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 4663 | err = ext4_ext_remove_space(inode, last_block, EXT_MAX_BLOCKS - 1); |
Theodore Ts'o | 8acd5e9 | 2013-07-15 00:09:19 -0400 | [diff] [blame] | 4664 | ext4_std_error(inode->i_sb, err); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4665 | } |
| 4666 | |
Lukas Czerner | 0e8b687 | 2014-03-18 18:03:51 -0400 | [diff] [blame] | 4667 | static int ext4_alloc_file_blocks(struct file *file, ext4_lblk_t offset, |
| 4668 | ext4_lblk_t len, int flags, int mode) |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4669 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 4670 | struct inode *inode = file_inode(file); |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4671 | handle_t *handle; |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4672 | int ret = 0; |
| 4673 | int ret2 = 0; |
| 4674 | int retries = 0; |
Theodore Ts'o | 2ed8868 | 2010-05-16 20:00:00 -0400 | [diff] [blame] | 4675 | struct ext4_map_blocks map; |
Lukas Czerner | 0e8b687 | 2014-03-18 18:03:51 -0400 | [diff] [blame] | 4676 | unsigned int credits; |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4677 | |
Lukas Czerner | 0e8b687 | 2014-03-18 18:03:51 -0400 | [diff] [blame] | 4678 | map.m_lblk = offset; |
Greg Harm | 3c6fe77 | 2011-10-31 18:41:47 -0400 | [diff] [blame] | 4679 | /* |
| 4680 | * Don't normalize the request if it can fit in one extent so |
| 4681 | * that it doesn't get unnecessarily split into multiple |
| 4682 | * extents. |
| 4683 | */ |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 4684 | if (len <= EXT_UNWRITTEN_MAX_LEN) |
Greg Harm | 3c6fe77 | 2011-10-31 18:41:47 -0400 | [diff] [blame] | 4685 | flags |= EXT4_GET_BLOCKS_NO_NORMALIZE; |
Dmitry Monakhov | 60d4616 | 2012-10-05 11:32:02 -0400 | [diff] [blame] | 4686 | |
Lukas Czerner | 0e8b687 | 2014-03-18 18:03:51 -0400 | [diff] [blame] | 4687 | /* |
| 4688 | * credits to insert 1 extent into extent tree |
| 4689 | */ |
| 4690 | credits = ext4_chunk_trans_blocks(inode, len); |
| 4691 | |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4692 | retry: |
Lukas Czerner | 0e8b687 | 2014-03-18 18:03:51 -0400 | [diff] [blame] | 4693 | while (ret >= 0 && ret < len) { |
Theodore Ts'o | 2ed8868 | 2010-05-16 20:00:00 -0400 | [diff] [blame] | 4694 | map.m_lblk = map.m_lblk + ret; |
Lukas Czerner | 0e8b687 | 2014-03-18 18:03:51 -0400 | [diff] [blame] | 4695 | map.m_len = len = len - ret; |
Theodore Ts'o | 9924a92 | 2013-02-08 21:59:22 -0500 | [diff] [blame] | 4696 | handle = ext4_journal_start(inode, EXT4_HT_MAP_BLOCKS, |
| 4697 | credits); |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4698 | if (IS_ERR(handle)) { |
| 4699 | ret = PTR_ERR(handle); |
| 4700 | break; |
| 4701 | } |
Dmitry Monakhov | a4e5d88 | 2011-10-25 08:15:12 -0400 | [diff] [blame] | 4702 | ret = ext4_map_blocks(handle, inode, &map, flags); |
Aneesh Kumar K.V | 221879c | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 4703 | if (ret <= 0) { |
Lukas Czerner | f282ac1 | 2014-03-18 17:44:35 -0400 | [diff] [blame] | 4704 | ext4_debug("inode #%lu: block %u: len %u: " |
| 4705 | "ext4_ext_map_blocks returned %d", |
| 4706 | inode->i_ino, map.m_lblk, |
| 4707 | map.m_len, ret); |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4708 | ext4_mark_inode_dirty(handle, inode); |
| 4709 | ret2 = ext4_journal_stop(handle); |
| 4710 | break; |
| 4711 | } |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4712 | ret2 = ext4_journal_stop(handle); |
| 4713 | if (ret2) |
| 4714 | break; |
| 4715 | } |
Aneesh Kumar K.V | fd28784 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 4716 | if (ret == -ENOSPC && |
| 4717 | ext4_should_retry_alloc(inode->i_sb, &retries)) { |
| 4718 | ret = 0; |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4719 | goto retry; |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4720 | } |
Lukas Czerner | f282ac1 | 2014-03-18 17:44:35 -0400 | [diff] [blame] | 4721 | |
Lukas Czerner | 0e8b687 | 2014-03-18 18:03:51 -0400 | [diff] [blame] | 4722 | return ret > 0 ? ret2 : ret; |
| 4723 | } |
| 4724 | |
Lukas Czerner | b8a8684 | 2014-03-18 18:05:35 -0400 | [diff] [blame] | 4725 | static long ext4_zero_range(struct file *file, loff_t offset, |
| 4726 | loff_t len, int mode) |
| 4727 | { |
| 4728 | struct inode *inode = file_inode(file); |
| 4729 | handle_t *handle = NULL; |
| 4730 | unsigned int max_blocks; |
| 4731 | loff_t new_size = 0; |
| 4732 | int ret = 0; |
| 4733 | int flags; |
| 4734 | int partial; |
| 4735 | loff_t start, end; |
| 4736 | ext4_lblk_t lblk; |
| 4737 | struct address_space *mapping = inode->i_mapping; |
| 4738 | unsigned int blkbits = inode->i_blkbits; |
| 4739 | |
| 4740 | trace_ext4_zero_range(inode, offset, len, mode); |
| 4741 | |
jon ernst | 6c5e73d | 2014-04-18 11:50:35 -0400 | [diff] [blame] | 4742 | if (!S_ISREG(inode->i_mode)) |
| 4743 | return -EINVAL; |
| 4744 | |
Namjae Jeon | e1ee60f | 2014-05-27 12:48:55 -0400 | [diff] [blame] | 4745 | /* Call ext4_force_commit to flush all data in case of data=journal. */ |
| 4746 | if (ext4_should_journal_data(inode)) { |
| 4747 | ret = ext4_force_commit(inode->i_sb); |
| 4748 | if (ret) |
| 4749 | return ret; |
| 4750 | } |
| 4751 | |
Lukas Czerner | b8a8684 | 2014-03-18 18:05:35 -0400 | [diff] [blame] | 4752 | /* |
| 4753 | * Write out all dirty pages to avoid race conditions |
| 4754 | * Then release them. |
| 4755 | */ |
| 4756 | if (mapping->nrpages && mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) { |
| 4757 | ret = filemap_write_and_wait_range(mapping, offset, |
| 4758 | offset + len - 1); |
| 4759 | if (ret) |
| 4760 | return ret; |
| 4761 | } |
| 4762 | |
| 4763 | /* |
| 4764 | * Round up offset. This is not fallocate, we neet to zero out |
| 4765 | * blocks, so convert interior block aligned part of the range to |
| 4766 | * unwritten and possibly manually zero out unaligned parts of the |
| 4767 | * range. |
| 4768 | */ |
| 4769 | start = round_up(offset, 1 << blkbits); |
| 4770 | end = round_down((offset + len), 1 << blkbits); |
| 4771 | |
| 4772 | if (start < offset || end > offset + len) |
| 4773 | return -EINVAL; |
| 4774 | partial = (offset + len) & ((1 << blkbits) - 1); |
| 4775 | |
| 4776 | lblk = start >> blkbits; |
| 4777 | max_blocks = (end >> blkbits); |
| 4778 | if (max_blocks < lblk) |
| 4779 | max_blocks = 0; |
| 4780 | else |
| 4781 | max_blocks -= lblk; |
| 4782 | |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 4783 | flags = EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT | |
Lukas Czerner | b8a8684 | 2014-03-18 18:05:35 -0400 | [diff] [blame] | 4784 | EXT4_GET_BLOCKS_CONVERT_UNWRITTEN; |
| 4785 | if (mode & FALLOC_FL_KEEP_SIZE) |
| 4786 | flags |= EXT4_GET_BLOCKS_KEEP_SIZE; |
| 4787 | |
| 4788 | mutex_lock(&inode->i_mutex); |
| 4789 | |
| 4790 | /* |
| 4791 | * Indirect files do not support unwritten extnets |
| 4792 | */ |
| 4793 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) { |
| 4794 | ret = -EOPNOTSUPP; |
| 4795 | goto out_mutex; |
| 4796 | } |
| 4797 | |
| 4798 | if (!(mode & FALLOC_FL_KEEP_SIZE) && |
| 4799 | offset + len > i_size_read(inode)) { |
| 4800 | new_size = offset + len; |
| 4801 | ret = inode_newsize_ok(inode, new_size); |
| 4802 | if (ret) |
| 4803 | goto out_mutex; |
| 4804 | /* |
| 4805 | * If we have a partial block after EOF we have to allocate |
| 4806 | * the entire block. |
| 4807 | */ |
| 4808 | if (partial) |
| 4809 | max_blocks += 1; |
| 4810 | } |
| 4811 | |
| 4812 | if (max_blocks > 0) { |
| 4813 | |
| 4814 | /* Now release the pages and zero block aligned part of pages*/ |
| 4815 | truncate_pagecache_range(inode, start, end - 1); |
| 4816 | |
| 4817 | /* Wait all existing dio workers, newcomers will block on i_mutex */ |
| 4818 | ext4_inode_block_unlocked_dio(inode); |
| 4819 | inode_dio_wait(inode); |
| 4820 | |
| 4821 | /* |
| 4822 | * Remove entire range from the extent status tree. |
| 4823 | */ |
| 4824 | ret = ext4_es_remove_extent(inode, lblk, max_blocks); |
| 4825 | if (ret) |
| 4826 | goto out_dio; |
| 4827 | |
| 4828 | ret = ext4_alloc_file_blocks(file, lblk, max_blocks, flags, |
| 4829 | mode); |
| 4830 | if (ret) |
| 4831 | goto out_dio; |
| 4832 | } |
| 4833 | |
| 4834 | handle = ext4_journal_start(inode, EXT4_HT_MISC, 4); |
| 4835 | if (IS_ERR(handle)) { |
| 4836 | ret = PTR_ERR(handle); |
| 4837 | ext4_std_error(inode->i_sb, ret); |
| 4838 | goto out_dio; |
| 4839 | } |
| 4840 | |
| 4841 | inode->i_mtime = inode->i_ctime = ext4_current_time(inode); |
| 4842 | |
Lukas Czerner | e5b3041 | 2014-04-01 00:59:21 -0400 | [diff] [blame] | 4843 | if (new_size) { |
Lukas Czerner | b8a8684 | 2014-03-18 18:05:35 -0400 | [diff] [blame] | 4844 | if (new_size > i_size_read(inode)) |
| 4845 | i_size_write(inode, new_size); |
| 4846 | if (new_size > EXT4_I(inode)->i_disksize) |
| 4847 | ext4_update_i_disksize(inode, new_size); |
Lukas Czerner | e5b3041 | 2014-04-01 00:59:21 -0400 | [diff] [blame] | 4848 | } else { |
Lukas Czerner | b8a8684 | 2014-03-18 18:05:35 -0400 | [diff] [blame] | 4849 | /* |
| 4850 | * Mark that we allocate beyond EOF so the subsequent truncate |
| 4851 | * can proceed even if the new size is the same as i_size. |
| 4852 | */ |
| 4853 | if ((offset + len) > i_size_read(inode)) |
| 4854 | ext4_set_inode_flag(inode, EXT4_INODE_EOFBLOCKS); |
| 4855 | } |
| 4856 | |
| 4857 | ext4_mark_inode_dirty(handle, inode); |
| 4858 | |
| 4859 | /* Zero out partial block at the edges of the range */ |
| 4860 | ret = ext4_zero_partial_blocks(handle, inode, offset, len); |
| 4861 | |
| 4862 | if (file->f_flags & O_SYNC) |
| 4863 | ext4_handle_sync(handle); |
| 4864 | |
| 4865 | ext4_journal_stop(handle); |
| 4866 | out_dio: |
| 4867 | ext4_inode_resume_unlocked_dio(inode); |
| 4868 | out_mutex: |
| 4869 | mutex_unlock(&inode->i_mutex); |
| 4870 | return ret; |
| 4871 | } |
| 4872 | |
Lukas Czerner | 0e8b687 | 2014-03-18 18:03:51 -0400 | [diff] [blame] | 4873 | /* |
| 4874 | * preallocate space for a file. This implements ext4's fallocate file |
| 4875 | * operation, which gets called from sys_fallocate system call. |
| 4876 | * For block-mapped files, posix_fallocate should fall back to the method |
| 4877 | * of writing zeroes to the required new blocks (the same behavior which is |
| 4878 | * expected for file systems which do not support fallocate() system call). |
| 4879 | */ |
| 4880 | long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len) |
| 4881 | { |
| 4882 | struct inode *inode = file_inode(file); |
| 4883 | handle_t *handle; |
| 4884 | loff_t new_size = 0; |
| 4885 | unsigned int max_blocks; |
| 4886 | int ret = 0; |
| 4887 | int flags; |
| 4888 | ext4_lblk_t lblk; |
| 4889 | struct timespec tv; |
| 4890 | unsigned int blkbits = inode->i_blkbits; |
| 4891 | |
| 4892 | /* Return error if mode is not supported */ |
| 4893 | if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE | |
Lukas Czerner | b8a8684 | 2014-03-18 18:05:35 -0400 | [diff] [blame] | 4894 | FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE)) |
Lukas Czerner | 0e8b687 | 2014-03-18 18:03:51 -0400 | [diff] [blame] | 4895 | return -EOPNOTSUPP; |
| 4896 | |
| 4897 | if (mode & FALLOC_FL_PUNCH_HOLE) |
| 4898 | return ext4_punch_hole(inode, offset, len); |
| 4899 | |
Lukas Czerner | 0e8b687 | 2014-03-18 18:03:51 -0400 | [diff] [blame] | 4900 | ret = ext4_convert_inline_data(inode); |
| 4901 | if (ret) |
| 4902 | return ret; |
| 4903 | |
| 4904 | /* |
| 4905 | * currently supporting (pre)allocate mode for extent-based |
| 4906 | * files _only_ |
| 4907 | */ |
| 4908 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
| 4909 | return -EOPNOTSUPP; |
| 4910 | |
Theodore Ts'o | 40c406c | 2014-04-12 22:53:53 -0400 | [diff] [blame] | 4911 | if (mode & FALLOC_FL_COLLAPSE_RANGE) |
| 4912 | return ext4_collapse_range(inode, offset, len); |
| 4913 | |
Lukas Czerner | b8a8684 | 2014-03-18 18:05:35 -0400 | [diff] [blame] | 4914 | if (mode & FALLOC_FL_ZERO_RANGE) |
| 4915 | return ext4_zero_range(file, offset, len, mode); |
| 4916 | |
Lukas Czerner | 0e8b687 | 2014-03-18 18:03:51 -0400 | [diff] [blame] | 4917 | trace_ext4_fallocate_enter(inode, offset, len, mode); |
| 4918 | lblk = offset >> blkbits; |
| 4919 | /* |
| 4920 | * We can't just convert len to max_blocks because |
| 4921 | * If blocksize = 4096 offset = 3072 and len = 2048 |
| 4922 | */ |
| 4923 | max_blocks = (EXT4_BLOCK_ALIGN(len + offset, blkbits) >> blkbits) |
| 4924 | - lblk; |
| 4925 | |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 4926 | flags = EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT; |
Lukas Czerner | 0e8b687 | 2014-03-18 18:03:51 -0400 | [diff] [blame] | 4927 | if (mode & FALLOC_FL_KEEP_SIZE) |
| 4928 | flags |= EXT4_GET_BLOCKS_KEEP_SIZE; |
| 4929 | |
| 4930 | mutex_lock(&inode->i_mutex); |
| 4931 | |
| 4932 | if (!(mode & FALLOC_FL_KEEP_SIZE) && |
| 4933 | offset + len > i_size_read(inode)) { |
| 4934 | new_size = offset + len; |
| 4935 | ret = inode_newsize_ok(inode, new_size); |
| 4936 | if (ret) |
| 4937 | goto out; |
| 4938 | } |
| 4939 | |
| 4940 | ret = ext4_alloc_file_blocks(file, lblk, max_blocks, flags, mode); |
| 4941 | if (ret) |
| 4942 | goto out; |
| 4943 | |
Lukas Czerner | f282ac1 | 2014-03-18 17:44:35 -0400 | [diff] [blame] | 4944 | handle = ext4_journal_start(inode, EXT4_HT_INODE, 2); |
| 4945 | if (IS_ERR(handle)) |
| 4946 | goto out; |
| 4947 | |
| 4948 | tv = inode->i_ctime = ext4_current_time(inode); |
| 4949 | |
Lukas Czerner | e5b3041 | 2014-04-01 00:59:21 -0400 | [diff] [blame] | 4950 | if (new_size) { |
Lukas Czerner | f282ac1 | 2014-03-18 17:44:35 -0400 | [diff] [blame] | 4951 | if (new_size > i_size_read(inode)) { |
| 4952 | i_size_write(inode, new_size); |
| 4953 | inode->i_mtime = tv; |
| 4954 | } |
| 4955 | if (new_size > EXT4_I(inode)->i_disksize) |
| 4956 | ext4_update_i_disksize(inode, new_size); |
Lukas Czerner | e5b3041 | 2014-04-01 00:59:21 -0400 | [diff] [blame] | 4957 | } else { |
Lukas Czerner | f282ac1 | 2014-03-18 17:44:35 -0400 | [diff] [blame] | 4958 | /* |
| 4959 | * Mark that we allocate beyond EOF so the subsequent truncate |
| 4960 | * can proceed even if the new size is the same as i_size. |
| 4961 | */ |
| 4962 | if ((offset + len) > i_size_read(inode)) |
| 4963 | ext4_set_inode_flag(inode, EXT4_INODE_EOFBLOCKS); |
| 4964 | } |
| 4965 | ext4_mark_inode_dirty(handle, inode); |
| 4966 | if (file->f_flags & O_SYNC) |
| 4967 | ext4_handle_sync(handle); |
| 4968 | |
| 4969 | ext4_journal_stop(handle); |
| 4970 | out: |
Aneesh Kumar K.V | 55bd725 | 2008-02-15 12:47:21 -0500 | [diff] [blame] | 4971 | mutex_unlock(&inode->i_mutex); |
Lukas Czerner | 0e8b687 | 2014-03-18 18:03:51 -0400 | [diff] [blame] | 4972 | trace_ext4_fallocate_exit(inode, offset, max_blocks, ret); |
| 4973 | return ret; |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4974 | } |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 4975 | |
| 4976 | /* |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4977 | * This function convert a range of blocks to written extents |
| 4978 | * The caller of this function will pass the start offset and the size. |
| 4979 | * all unwritten extents within this range will be converted to |
| 4980 | * written extents. |
| 4981 | * |
| 4982 | * This function is called from the direct IO end io call back |
| 4983 | * function, to convert the fallocated extents after IO is completed. |
Mingming | 109f556 | 2009-11-10 10:48:08 -0500 | [diff] [blame] | 4984 | * Returns 0 on success. |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4985 | */ |
Jan Kara | 6b523df | 2013-06-04 13:21:11 -0400 | [diff] [blame] | 4986 | int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, |
| 4987 | loff_t offset, ssize_t len) |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4988 | { |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4989 | unsigned int max_blocks; |
| 4990 | int ret = 0; |
| 4991 | int ret2 = 0; |
Theodore Ts'o | 2ed8868 | 2010-05-16 20:00:00 -0400 | [diff] [blame] | 4992 | struct ext4_map_blocks map; |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4993 | unsigned int credits, blkbits = inode->i_blkbits; |
| 4994 | |
Theodore Ts'o | 2ed8868 | 2010-05-16 20:00:00 -0400 | [diff] [blame] | 4995 | map.m_lblk = offset >> blkbits; |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4996 | /* |
| 4997 | * We can't just convert len to max_blocks because |
| 4998 | * If blocksize = 4096 offset = 3072 and len = 2048 |
| 4999 | */ |
Theodore Ts'o | 2ed8868 | 2010-05-16 20:00:00 -0400 | [diff] [blame] | 5000 | max_blocks = ((EXT4_BLOCK_ALIGN(len + offset, blkbits) >> blkbits) - |
| 5001 | map.m_lblk); |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 5002 | /* |
Jan Kara | 6b523df | 2013-06-04 13:21:11 -0400 | [diff] [blame] | 5003 | * This is somewhat ugly but the idea is clear: When transaction is |
| 5004 | * reserved, everything goes into it. Otherwise we rather start several |
| 5005 | * smaller transactions for conversion of each extent separately. |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 5006 | */ |
Jan Kara | 6b523df | 2013-06-04 13:21:11 -0400 | [diff] [blame] | 5007 | if (handle) { |
| 5008 | handle = ext4_journal_start_reserved(handle, |
| 5009 | EXT4_HT_EXT_CONVERT); |
| 5010 | if (IS_ERR(handle)) |
| 5011 | return PTR_ERR(handle); |
| 5012 | credits = 0; |
| 5013 | } else { |
| 5014 | /* |
| 5015 | * credits to insert 1 extent into extent tree |
| 5016 | */ |
| 5017 | credits = ext4_chunk_trans_blocks(inode, max_blocks); |
| 5018 | } |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 5019 | while (ret >= 0 && ret < max_blocks) { |
Theodore Ts'o | 2ed8868 | 2010-05-16 20:00:00 -0400 | [diff] [blame] | 5020 | map.m_lblk += ret; |
| 5021 | map.m_len = (max_blocks -= ret); |
Jan Kara | 6b523df | 2013-06-04 13:21:11 -0400 | [diff] [blame] | 5022 | if (credits) { |
| 5023 | handle = ext4_journal_start(inode, EXT4_HT_MAP_BLOCKS, |
| 5024 | credits); |
| 5025 | if (IS_ERR(handle)) { |
| 5026 | ret = PTR_ERR(handle); |
| 5027 | break; |
| 5028 | } |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 5029 | } |
Theodore Ts'o | 2ed8868 | 2010-05-16 20:00:00 -0400 | [diff] [blame] | 5030 | ret = ext4_map_blocks(handle, inode, &map, |
Jiaying Zhang | c7064ef | 2010-03-02 13:28:44 -0500 | [diff] [blame] | 5031 | EXT4_GET_BLOCKS_IO_CONVERT_EXT); |
Lukas Czerner | b06acd3 | 2013-01-28 21:21:12 -0500 | [diff] [blame] | 5032 | if (ret <= 0) |
| 5033 | ext4_warning(inode->i_sb, |
| 5034 | "inode #%lu: block %u: len %u: " |
| 5035 | "ext4_ext_map_blocks returned %d", |
| 5036 | inode->i_ino, map.m_lblk, |
| 5037 | map.m_len, ret); |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 5038 | ext4_mark_inode_dirty(handle, inode); |
Jan Kara | 6b523df | 2013-06-04 13:21:11 -0400 | [diff] [blame] | 5039 | if (credits) |
| 5040 | ret2 = ext4_journal_stop(handle); |
| 5041 | if (ret <= 0 || ret2) |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 5042 | break; |
| 5043 | } |
Jan Kara | 6b523df | 2013-06-04 13:21:11 -0400 | [diff] [blame] | 5044 | if (!credits) |
| 5045 | ret2 = ext4_journal_stop(handle); |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 5046 | return ret > 0 ? ret2 : ret; |
| 5047 | } |
Yongqiang Yang | 6d9c85e | 2011-02-27 17:25:47 -0500 | [diff] [blame] | 5048 | |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 5049 | /* |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 5050 | * If newes is not existing extent (newes->ec_pblk equals zero) find |
| 5051 | * delayed extent at start of newes and update newes accordingly and |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 5052 | * return start of the next delayed extent. |
| 5053 | * |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 5054 | * If newes is existing extent (newes->ec_pblk is not equal zero) |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 5055 | * return start of next delayed extent or EXT_MAX_BLOCKS if no delayed |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 5056 | * extent found. Leave newes unmodified. |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 5057 | */ |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 5058 | static int ext4_find_delayed_extent(struct inode *inode, |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 5059 | struct extent_status *newes) |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 5060 | { |
Zheng Liu | b3aff3e | 2012-11-08 21:57:37 -0500 | [diff] [blame] | 5061 | struct extent_status es; |
Zheng Liu | be40136 | 2013-02-18 00:27:26 -0500 | [diff] [blame] | 5062 | ext4_lblk_t block, next_del; |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 5063 | |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 5064 | if (newes->es_pblk == 0) { |
Yan, Zheng | e30b5dc | 2013-05-03 02:15:52 -0400 | [diff] [blame] | 5065 | ext4_es_find_delayed_extent_range(inode, newes->es_lblk, |
| 5066 | newes->es_lblk + newes->es_len - 1, &es); |
| 5067 | |
Yongqiang Yang | 6d9c85e | 2011-02-27 17:25:47 -0500 | [diff] [blame] | 5068 | /* |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 5069 | * No extent in extent-tree contains block @newes->es_pblk, |
Yongqiang Yang | 6d9c85e | 2011-02-27 17:25:47 -0500 | [diff] [blame] | 5070 | * then the block may stay in 1)a hole or 2)delayed-extent. |
Yongqiang Yang | 6d9c85e | 2011-02-27 17:25:47 -0500 | [diff] [blame] | 5071 | */ |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 5072 | if (es.es_len == 0) |
Zheng Liu | b3aff3e | 2012-11-08 21:57:37 -0500 | [diff] [blame] | 5073 | /* A hole found. */ |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 5074 | return 0; |
Yongqiang Yang | 6d9c85e | 2011-02-27 17:25:47 -0500 | [diff] [blame] | 5075 | |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 5076 | if (es.es_lblk > newes->es_lblk) { |
Zheng Liu | b3aff3e | 2012-11-08 21:57:37 -0500 | [diff] [blame] | 5077 | /* A hole found. */ |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 5078 | newes->es_len = min(es.es_lblk - newes->es_lblk, |
| 5079 | newes->es_len); |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 5080 | return 0; |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 5081 | } |
Yongqiang Yang | 6d9c85e | 2011-02-27 17:25:47 -0500 | [diff] [blame] | 5082 | |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 5083 | newes->es_len = es.es_lblk + es.es_len - newes->es_lblk; |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 5084 | } |
| 5085 | |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 5086 | block = newes->es_lblk + newes->es_len; |
Yan, Zheng | e30b5dc | 2013-05-03 02:15:52 -0400 | [diff] [blame] | 5087 | ext4_es_find_delayed_extent_range(inode, block, EXT_MAX_BLOCKS, &es); |
Zheng Liu | be40136 | 2013-02-18 00:27:26 -0500 | [diff] [blame] | 5088 | if (es.es_len == 0) |
| 5089 | next_del = EXT_MAX_BLOCKS; |
| 5090 | else |
| 5091 | next_del = es.es_lblk; |
| 5092 | |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 5093 | return next_del; |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 5094 | } |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 5095 | /* fiemap flags we can handle specified here */ |
| 5096 | #define EXT4_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC|FIEMAP_FLAG_XATTR) |
| 5097 | |
Aneesh Kumar K.V | 3a06d77 | 2008-11-22 15:04:59 -0500 | [diff] [blame] | 5098 | static int ext4_xattr_fiemap(struct inode *inode, |
| 5099 | struct fiemap_extent_info *fieinfo) |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 5100 | { |
| 5101 | __u64 physical = 0; |
| 5102 | __u64 length; |
| 5103 | __u32 flags = FIEMAP_EXTENT_LAST; |
| 5104 | int blockbits = inode->i_sb->s_blocksize_bits; |
| 5105 | int error = 0; |
| 5106 | |
| 5107 | /* in-inode? */ |
Theodore Ts'o | 19f5fb7 | 2010-01-24 14:34:07 -0500 | [diff] [blame] | 5108 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 5109 | struct ext4_iloc iloc; |
| 5110 | int offset; /* offset of xattr in inode */ |
| 5111 | |
| 5112 | error = ext4_get_inode_loc(inode, &iloc); |
| 5113 | if (error) |
| 5114 | return error; |
Jan Kara | a60697f | 2013-05-31 19:38:56 -0400 | [diff] [blame] | 5115 | physical = (__u64)iloc.bh->b_blocknr << blockbits; |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 5116 | offset = EXT4_GOOD_OLD_INODE_SIZE + |
| 5117 | EXT4_I(inode)->i_extra_isize; |
| 5118 | physical += offset; |
| 5119 | length = EXT4_SB(inode->i_sb)->s_inode_size - offset; |
| 5120 | flags |= FIEMAP_EXTENT_DATA_INLINE; |
Curt Wohlgemuth | fd2dd9f | 2010-04-03 17:44:16 -0400 | [diff] [blame] | 5121 | brelse(iloc.bh); |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 5122 | } else { /* external block */ |
Jan Kara | a60697f | 2013-05-31 19:38:56 -0400 | [diff] [blame] | 5123 | physical = (__u64)EXT4_I(inode)->i_file_acl << blockbits; |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 5124 | length = inode->i_sb->s_blocksize; |
| 5125 | } |
| 5126 | |
| 5127 | if (physical) |
| 5128 | error = fiemap_fill_next_extent(fieinfo, 0, physical, |
| 5129 | length, flags); |
| 5130 | return (error < 0 ? error : 0); |
| 5131 | } |
| 5132 | |
| 5133 | int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
| 5134 | __u64 start, __u64 len) |
| 5135 | { |
| 5136 | ext4_lblk_t start_blk; |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 5137 | int error = 0; |
| 5138 | |
Tao Ma | 9419198 | 2012-12-10 14:06:02 -0500 | [diff] [blame] | 5139 | if (ext4_has_inline_data(inode)) { |
| 5140 | int has_inline = 1; |
| 5141 | |
| 5142 | error = ext4_inline_data_fiemap(inode, fieinfo, &has_inline); |
| 5143 | |
| 5144 | if (has_inline) |
| 5145 | return error; |
| 5146 | } |
| 5147 | |
Theodore Ts'o | 7869a4a | 2013-08-16 22:05:14 -0400 | [diff] [blame] | 5148 | if (fieinfo->fi_flags & FIEMAP_FLAG_CACHE) { |
| 5149 | error = ext4_ext_precache(inode); |
| 5150 | if (error) |
| 5151 | return error; |
| 5152 | } |
| 5153 | |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 5154 | /* fallback to generic here if not in extents fmt */ |
Dmitry Monakhov | 12e9b89 | 2010-05-16 22:00:00 -0400 | [diff] [blame] | 5155 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 5156 | return generic_block_fiemap(inode, fieinfo, start, len, |
| 5157 | ext4_get_block); |
| 5158 | |
| 5159 | if (fiemap_check_flags(fieinfo, EXT4_FIEMAP_FLAGS)) |
| 5160 | return -EBADR; |
| 5161 | |
| 5162 | if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) { |
| 5163 | error = ext4_xattr_fiemap(inode, fieinfo); |
| 5164 | } else { |
Leonard Michlmayr | aca92ff | 2010-03-04 17:07:28 -0500 | [diff] [blame] | 5165 | ext4_lblk_t len_blks; |
| 5166 | __u64 last_blk; |
| 5167 | |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 5168 | start_blk = start >> inode->i_sb->s_blocksize_bits; |
Leonard Michlmayr | aca92ff | 2010-03-04 17:07:28 -0500 | [diff] [blame] | 5169 | last_blk = (start + len - 1) >> inode->i_sb->s_blocksize_bits; |
Lukas Czerner | f17722f | 2011-06-06 00:05:17 -0400 | [diff] [blame] | 5170 | if (last_blk >= EXT_MAX_BLOCKS) |
| 5171 | last_blk = EXT_MAX_BLOCKS-1; |
Leonard Michlmayr | aca92ff | 2010-03-04 17:07:28 -0500 | [diff] [blame] | 5172 | len_blks = ((ext4_lblk_t) last_blk) - start_blk + 1; |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 5173 | |
| 5174 | /* |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 5175 | * Walk the extent tree gathering extent information |
| 5176 | * and pushing extents back to the user. |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 5177 | */ |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 5178 | error = ext4_fill_fiemap_extents(inode, start_blk, |
| 5179 | len_blks, fieinfo); |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 5180 | } |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 5181 | ext4_es_lru_add(inode); |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 5182 | return error; |
| 5183 | } |
Namjae Jeon | 9eb7948 | 2014-02-23 15:18:59 -0500 | [diff] [blame] | 5184 | |
| 5185 | /* |
| 5186 | * ext4_access_path: |
| 5187 | * Function to access the path buffer for marking it dirty. |
| 5188 | * It also checks if there are sufficient credits left in the journal handle |
| 5189 | * to update path. |
| 5190 | */ |
| 5191 | static int |
| 5192 | ext4_access_path(handle_t *handle, struct inode *inode, |
| 5193 | struct ext4_ext_path *path) |
| 5194 | { |
| 5195 | int credits, err; |
| 5196 | |
| 5197 | if (!ext4_handle_valid(handle)) |
| 5198 | return 0; |
| 5199 | |
| 5200 | /* |
| 5201 | * Check if need to extend journal credits |
| 5202 | * 3 for leaf, sb, and inode plus 2 (bmap and group |
| 5203 | * descriptor) for each block group; assume two block |
| 5204 | * groups |
| 5205 | */ |
| 5206 | if (handle->h_buffer_credits < 7) { |
| 5207 | credits = ext4_writepage_trans_blocks(inode); |
| 5208 | err = ext4_ext_truncate_extend_restart(handle, inode, credits); |
| 5209 | /* EAGAIN is success */ |
| 5210 | if (err && err != -EAGAIN) |
| 5211 | return err; |
| 5212 | } |
| 5213 | |
| 5214 | err = ext4_ext_get_access(handle, inode, path); |
| 5215 | return err; |
| 5216 | } |
| 5217 | |
| 5218 | /* |
| 5219 | * ext4_ext_shift_path_extents: |
| 5220 | * Shift the extents of a path structure lying between path[depth].p_ext |
| 5221 | * and EXT_LAST_EXTENT(path[depth].p_hdr) downwards, by subtracting shift |
| 5222 | * from starting block for each extent. |
| 5223 | */ |
| 5224 | static int |
| 5225 | ext4_ext_shift_path_extents(struct ext4_ext_path *path, ext4_lblk_t shift, |
| 5226 | struct inode *inode, handle_t *handle, |
| 5227 | ext4_lblk_t *start) |
| 5228 | { |
| 5229 | int depth, err = 0; |
| 5230 | struct ext4_extent *ex_start, *ex_last; |
| 5231 | bool update = 0; |
| 5232 | depth = path->p_depth; |
| 5233 | |
| 5234 | while (depth >= 0) { |
| 5235 | if (depth == path->p_depth) { |
| 5236 | ex_start = path[depth].p_ext; |
| 5237 | if (!ex_start) |
| 5238 | return -EIO; |
| 5239 | |
| 5240 | ex_last = EXT_LAST_EXTENT(path[depth].p_hdr); |
| 5241 | if (!ex_last) |
| 5242 | return -EIO; |
| 5243 | |
| 5244 | err = ext4_access_path(handle, inode, path + depth); |
| 5245 | if (err) |
| 5246 | goto out; |
| 5247 | |
| 5248 | if (ex_start == EXT_FIRST_EXTENT(path[depth].p_hdr)) |
| 5249 | update = 1; |
| 5250 | |
Zheng Liu | 847c6c4 | 2014-04-12 12:45:55 -0400 | [diff] [blame] | 5251 | *start = le32_to_cpu(ex_last->ee_block) + |
Namjae Jeon | 9eb7948 | 2014-02-23 15:18:59 -0500 | [diff] [blame] | 5252 | ext4_ext_get_actual_len(ex_last); |
| 5253 | |
| 5254 | while (ex_start <= ex_last) { |
Zheng Liu | 847c6c4 | 2014-04-12 12:45:55 -0400 | [diff] [blame] | 5255 | le32_add_cpu(&ex_start->ee_block, -shift); |
Lukas Czerner | 6dd834e | 2014-04-18 10:55:24 -0400 | [diff] [blame] | 5256 | /* Try to merge to the left. */ |
| 5257 | if ((ex_start > |
| 5258 | EXT_FIRST_EXTENT(path[depth].p_hdr)) && |
| 5259 | ext4_ext_try_to_merge_right(inode, |
| 5260 | path, ex_start - 1)) |
| 5261 | ex_last--; |
| 5262 | else |
| 5263 | ex_start++; |
Namjae Jeon | 9eb7948 | 2014-02-23 15:18:59 -0500 | [diff] [blame] | 5264 | } |
| 5265 | err = ext4_ext_dirty(handle, inode, path + depth); |
| 5266 | if (err) |
| 5267 | goto out; |
| 5268 | |
| 5269 | if (--depth < 0 || !update) |
| 5270 | break; |
| 5271 | } |
| 5272 | |
| 5273 | /* Update index too */ |
| 5274 | err = ext4_access_path(handle, inode, path + depth); |
| 5275 | if (err) |
| 5276 | goto out; |
| 5277 | |
Zheng Liu | 847c6c4 | 2014-04-12 12:45:55 -0400 | [diff] [blame] | 5278 | le32_add_cpu(&path[depth].p_idx->ei_block, -shift); |
Namjae Jeon | 9eb7948 | 2014-02-23 15:18:59 -0500 | [diff] [blame] | 5279 | err = ext4_ext_dirty(handle, inode, path + depth); |
| 5280 | if (err) |
| 5281 | goto out; |
| 5282 | |
| 5283 | /* we are done if current index is not a starting index */ |
| 5284 | if (path[depth].p_idx != EXT_FIRST_INDEX(path[depth].p_hdr)) |
| 5285 | break; |
| 5286 | |
| 5287 | depth--; |
| 5288 | } |
| 5289 | |
| 5290 | out: |
| 5291 | return err; |
| 5292 | } |
| 5293 | |
| 5294 | /* |
| 5295 | * ext4_ext_shift_extents: |
| 5296 | * All the extents which lies in the range from start to the last allocated |
| 5297 | * block for the file are shifted downwards by shift blocks. |
| 5298 | * On success, 0 is returned, error otherwise. |
| 5299 | */ |
| 5300 | static int |
| 5301 | ext4_ext_shift_extents(struct inode *inode, handle_t *handle, |
| 5302 | ext4_lblk_t start, ext4_lblk_t shift) |
| 5303 | { |
| 5304 | struct ext4_ext_path *path; |
| 5305 | int ret = 0, depth; |
| 5306 | struct ext4_extent *extent; |
| 5307 | ext4_lblk_t stop_block, current_block; |
| 5308 | ext4_lblk_t ex_start, ex_end; |
| 5309 | |
| 5310 | /* Let path point to the last extent */ |
| 5311 | path = ext4_ext_find_extent(inode, EXT_MAX_BLOCKS - 1, NULL, 0); |
| 5312 | if (IS_ERR(path)) |
| 5313 | return PTR_ERR(path); |
| 5314 | |
| 5315 | depth = path->p_depth; |
| 5316 | extent = path[depth].p_ext; |
| 5317 | if (!extent) { |
| 5318 | ext4_ext_drop_refs(path); |
| 5319 | kfree(path); |
| 5320 | return ret; |
| 5321 | } |
| 5322 | |
Zheng Liu | 847c6c4 | 2014-04-12 12:45:55 -0400 | [diff] [blame] | 5323 | stop_block = le32_to_cpu(extent->ee_block) + |
| 5324 | ext4_ext_get_actual_len(extent); |
Namjae Jeon | 9eb7948 | 2014-02-23 15:18:59 -0500 | [diff] [blame] | 5325 | ext4_ext_drop_refs(path); |
| 5326 | kfree(path); |
| 5327 | |
| 5328 | /* Nothing to shift, if hole is at the end of file */ |
| 5329 | if (start >= stop_block) |
| 5330 | return ret; |
| 5331 | |
| 5332 | /* |
| 5333 | * Don't start shifting extents until we make sure the hole is big |
| 5334 | * enough to accomodate the shift. |
| 5335 | */ |
| 5336 | path = ext4_ext_find_extent(inode, start - 1, NULL, 0); |
Dmitry Monakhov | 8dc79ec | 2014-04-13 15:05:42 -0400 | [diff] [blame] | 5337 | if (IS_ERR(path)) |
| 5338 | return PTR_ERR(path); |
Namjae Jeon | 9eb7948 | 2014-02-23 15:18:59 -0500 | [diff] [blame] | 5339 | depth = path->p_depth; |
| 5340 | extent = path[depth].p_ext; |
Dmitry Monakhov | 8dc79ec | 2014-04-13 15:05:42 -0400 | [diff] [blame] | 5341 | if (extent) { |
| 5342 | ex_start = le32_to_cpu(extent->ee_block); |
| 5343 | ex_end = le32_to_cpu(extent->ee_block) + |
Zheng Liu | 847c6c4 | 2014-04-12 12:45:55 -0400 | [diff] [blame] | 5344 | ext4_ext_get_actual_len(extent); |
Dmitry Monakhov | 8dc79ec | 2014-04-13 15:05:42 -0400 | [diff] [blame] | 5345 | } else { |
| 5346 | ex_start = 0; |
| 5347 | ex_end = 0; |
| 5348 | } |
Namjae Jeon | 9eb7948 | 2014-02-23 15:18:59 -0500 | [diff] [blame] | 5349 | ext4_ext_drop_refs(path); |
| 5350 | kfree(path); |
| 5351 | |
| 5352 | if ((start == ex_start && shift > ex_start) || |
| 5353 | (shift > start - ex_end)) |
| 5354 | return -EINVAL; |
| 5355 | |
| 5356 | /* Its safe to start updating extents */ |
| 5357 | while (start < stop_block) { |
| 5358 | path = ext4_ext_find_extent(inode, start, NULL, 0); |
| 5359 | if (IS_ERR(path)) |
| 5360 | return PTR_ERR(path); |
| 5361 | depth = path->p_depth; |
| 5362 | extent = path[depth].p_ext; |
Dmitry Monakhov | a18ed35 | 2014-04-13 15:41:13 -0400 | [diff] [blame] | 5363 | if (!extent) { |
| 5364 | EXT4_ERROR_INODE(inode, "unexpected hole at %lu", |
| 5365 | (unsigned long) start); |
| 5366 | return -EIO; |
| 5367 | } |
| 5368 | |
Zheng Liu | 847c6c4 | 2014-04-12 12:45:55 -0400 | [diff] [blame] | 5369 | current_block = le32_to_cpu(extent->ee_block); |
Namjae Jeon | 9eb7948 | 2014-02-23 15:18:59 -0500 | [diff] [blame] | 5370 | if (start > current_block) { |
| 5371 | /* Hole, move to the next extent */ |
| 5372 | ret = mext_next_extent(inode, path, &extent); |
| 5373 | if (ret != 0) { |
| 5374 | ext4_ext_drop_refs(path); |
| 5375 | kfree(path); |
| 5376 | if (ret == 1) |
| 5377 | ret = 0; |
| 5378 | break; |
| 5379 | } |
| 5380 | } |
| 5381 | ret = ext4_ext_shift_path_extents(path, shift, inode, |
| 5382 | handle, &start); |
| 5383 | ext4_ext_drop_refs(path); |
| 5384 | kfree(path); |
| 5385 | if (ret) |
| 5386 | break; |
| 5387 | } |
| 5388 | |
| 5389 | return ret; |
| 5390 | } |
| 5391 | |
| 5392 | /* |
| 5393 | * ext4_collapse_range: |
| 5394 | * This implements the fallocate's collapse range functionality for ext4 |
| 5395 | * Returns: 0 and non-zero on error. |
| 5396 | */ |
| 5397 | int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len) |
| 5398 | { |
| 5399 | struct super_block *sb = inode->i_sb; |
| 5400 | ext4_lblk_t punch_start, punch_stop; |
| 5401 | handle_t *handle; |
| 5402 | unsigned int credits; |
Namjae Jeon | a8680e0 | 2014-04-19 16:37:31 -0400 | [diff] [blame] | 5403 | loff_t new_size, ioffset; |
Namjae Jeon | 9eb7948 | 2014-02-23 15:18:59 -0500 | [diff] [blame] | 5404 | int ret; |
| 5405 | |
Namjae Jeon | 9eb7948 | 2014-02-23 15:18:59 -0500 | [diff] [blame] | 5406 | /* Collapse range works only on fs block size aligned offsets. */ |
Namjae Jeon | ee98fa3 | 2014-07-29 10:45:31 -0400 | [diff] [blame] | 5407 | if (offset & (EXT4_CLUSTER_SIZE(sb) - 1) || |
| 5408 | len & (EXT4_CLUSTER_SIZE(sb) - 1)) |
Namjae Jeon | 9eb7948 | 2014-02-23 15:18:59 -0500 | [diff] [blame] | 5409 | return -EINVAL; |
| 5410 | |
| 5411 | if (!S_ISREG(inode->i_mode)) |
Theodore Ts'o | 86f1ca3 | 2014-04-18 11:52:11 -0400 | [diff] [blame] | 5412 | return -EINVAL; |
Namjae Jeon | 9eb7948 | 2014-02-23 15:18:59 -0500 | [diff] [blame] | 5413 | |
| 5414 | trace_ext4_collapse_range(inode, offset, len); |
| 5415 | |
| 5416 | punch_start = offset >> EXT4_BLOCK_SIZE_BITS(sb); |
| 5417 | punch_stop = (offset + len) >> EXT4_BLOCK_SIZE_BITS(sb); |
| 5418 | |
Namjae Jeon | 1ce01c4 | 2014-04-10 22:58:20 -0400 | [diff] [blame] | 5419 | /* Call ext4_force_commit to flush all data in case of data=journal. */ |
| 5420 | if (ext4_should_journal_data(inode)) { |
| 5421 | ret = ext4_force_commit(inode->i_sb); |
| 5422 | if (ret) |
| 5423 | return ret; |
| 5424 | } |
| 5425 | |
Namjae Jeon | a8680e0 | 2014-04-19 16:37:31 -0400 | [diff] [blame] | 5426 | /* |
| 5427 | * Need to round down offset to be aligned with page size boundary |
| 5428 | * for page size > block size. |
| 5429 | */ |
| 5430 | ioffset = round_down(offset, PAGE_SIZE); |
| 5431 | |
Namjae Jeon | 9eb7948 | 2014-02-23 15:18:59 -0500 | [diff] [blame] | 5432 | /* Write out all dirty pages */ |
Namjae Jeon | a8680e0 | 2014-04-19 16:37:31 -0400 | [diff] [blame] | 5433 | ret = filemap_write_and_wait_range(inode->i_mapping, ioffset, |
| 5434 | LLONG_MAX); |
Namjae Jeon | 9eb7948 | 2014-02-23 15:18:59 -0500 | [diff] [blame] | 5435 | if (ret) |
| 5436 | return ret; |
| 5437 | |
| 5438 | /* Take mutex lock */ |
| 5439 | mutex_lock(&inode->i_mutex); |
| 5440 | |
Lukas Czerner | 23fffa9 | 2014-04-12 09:56:41 -0400 | [diff] [blame] | 5441 | /* |
| 5442 | * There is no need to overlap collapse range with EOF, in which case |
| 5443 | * it is effectively a truncate operation |
| 5444 | */ |
| 5445 | if (offset + len >= i_size_read(inode)) { |
| 5446 | ret = -EINVAL; |
| 5447 | goto out_mutex; |
| 5448 | } |
| 5449 | |
Namjae Jeon | 9eb7948 | 2014-02-23 15:18:59 -0500 | [diff] [blame] | 5450 | /* Currently just for extent based files */ |
| 5451 | if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) { |
| 5452 | ret = -EOPNOTSUPP; |
| 5453 | goto out_mutex; |
| 5454 | } |
| 5455 | |
Namjae Jeon | a8680e0 | 2014-04-19 16:37:31 -0400 | [diff] [blame] | 5456 | truncate_pagecache(inode, ioffset); |
Namjae Jeon | 9eb7948 | 2014-02-23 15:18:59 -0500 | [diff] [blame] | 5457 | |
| 5458 | /* Wait for existing dio to complete */ |
| 5459 | ext4_inode_block_unlocked_dio(inode); |
| 5460 | inode_dio_wait(inode); |
| 5461 | |
| 5462 | credits = ext4_writepage_trans_blocks(inode); |
| 5463 | handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE, credits); |
| 5464 | if (IS_ERR(handle)) { |
| 5465 | ret = PTR_ERR(handle); |
| 5466 | goto out_dio; |
| 5467 | } |
| 5468 | |
| 5469 | down_write(&EXT4_I(inode)->i_data_sem); |
| 5470 | ext4_discard_preallocations(inode); |
| 5471 | |
| 5472 | ret = ext4_es_remove_extent(inode, punch_start, |
Lukas Czerner | 2c1d232 | 2014-04-18 10:43:21 -0400 | [diff] [blame] | 5473 | EXT_MAX_BLOCKS - punch_start); |
Namjae Jeon | 9eb7948 | 2014-02-23 15:18:59 -0500 | [diff] [blame] | 5474 | if (ret) { |
| 5475 | up_write(&EXT4_I(inode)->i_data_sem); |
| 5476 | goto out_stop; |
| 5477 | } |
| 5478 | |
| 5479 | ret = ext4_ext_remove_space(inode, punch_start, punch_stop - 1); |
| 5480 | if (ret) { |
| 5481 | up_write(&EXT4_I(inode)->i_data_sem); |
| 5482 | goto out_stop; |
| 5483 | } |
Lukas Czerner | ef24f6c | 2014-04-18 10:50:23 -0400 | [diff] [blame] | 5484 | ext4_discard_preallocations(inode); |
Namjae Jeon | 9eb7948 | 2014-02-23 15:18:59 -0500 | [diff] [blame] | 5485 | |
| 5486 | ret = ext4_ext_shift_extents(inode, handle, punch_stop, |
| 5487 | punch_stop - punch_start); |
| 5488 | if (ret) { |
| 5489 | up_write(&EXT4_I(inode)->i_data_sem); |
| 5490 | goto out_stop; |
| 5491 | } |
| 5492 | |
| 5493 | new_size = i_size_read(inode) - len; |
Lukas Czerner | 9337d5d | 2014-04-18 10:48:25 -0400 | [diff] [blame] | 5494 | i_size_write(inode, new_size); |
Namjae Jeon | 9eb7948 | 2014-02-23 15:18:59 -0500 | [diff] [blame] | 5495 | EXT4_I(inode)->i_disksize = new_size; |
| 5496 | |
Namjae Jeon | 9eb7948 | 2014-02-23 15:18:59 -0500 | [diff] [blame] | 5497 | up_write(&EXT4_I(inode)->i_data_sem); |
| 5498 | if (IS_SYNC(inode)) |
| 5499 | ext4_handle_sync(handle); |
| 5500 | inode->i_mtime = inode->i_ctime = ext4_current_time(inode); |
| 5501 | ext4_mark_inode_dirty(handle, inode); |
| 5502 | |
| 5503 | out_stop: |
| 5504 | ext4_journal_stop(handle); |
| 5505 | out_dio: |
| 5506 | ext4_inode_resume_unlocked_dio(inode); |
| 5507 | out_mutex: |
| 5508 | mutex_unlock(&inode->i_mutex); |
| 5509 | return ret; |
| 5510 | } |