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> |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 40 | #include <linux/falloc.h> |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 41 | #include <asm/uaccess.h> |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 42 | #include <linux/fiemap.h> |
Christoph Hellwig | 3dcf545 | 2008-04-29 18:13:32 -0400 | [diff] [blame] | 43 | #include "ext4_jbd2.h" |
Theodore Ts'o | 4a092d7 | 2012-11-28 13:03:30 -0500 | [diff] [blame] | 44 | #include "ext4_extents.h" |
Tao Ma | f19d587 | 2012-12-10 14:05:51 -0500 | [diff] [blame] | 45 | #include "xattr.h" |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 46 | |
Jiaying Zhang | 0562e0b | 2011-03-21 21:38:05 -0400 | [diff] [blame] | 47 | #include <trace/events/ext4.h> |
| 48 | |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 49 | /* |
| 50 | * used by extent splitting. |
| 51 | */ |
| 52 | #define EXT4_EXT_MAY_ZEROOUT 0x1 /* safe to zeroout if split fails \ |
| 53 | due to ENOSPC */ |
| 54 | #define EXT4_EXT_MARK_UNINIT1 0x2 /* mark first half uninitialized */ |
| 55 | #define EXT4_EXT_MARK_UNINIT2 0x4 /* mark second half uninitialized */ |
| 56 | |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 57 | #define EXT4_EXT_DATA_VALID1 0x8 /* first half contains valid data */ |
| 58 | #define EXT4_EXT_DATA_VALID2 0x10 /* second half contains valid data */ |
| 59 | |
Darrick J. Wong | 7ac5990 | 2012-04-29 18:37:10 -0400 | [diff] [blame] | 60 | static __le32 ext4_extent_block_csum(struct inode *inode, |
| 61 | struct ext4_extent_header *eh) |
| 62 | { |
| 63 | struct ext4_inode_info *ei = EXT4_I(inode); |
| 64 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
| 65 | __u32 csum; |
| 66 | |
| 67 | csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)eh, |
| 68 | EXT4_EXTENT_TAIL_OFFSET(eh)); |
| 69 | return cpu_to_le32(csum); |
| 70 | } |
| 71 | |
| 72 | static int ext4_extent_block_csum_verify(struct inode *inode, |
| 73 | struct ext4_extent_header *eh) |
| 74 | { |
| 75 | struct ext4_extent_tail *et; |
| 76 | |
| 77 | if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, |
| 78 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) |
| 79 | return 1; |
| 80 | |
| 81 | et = find_ext4_extent_tail(eh); |
| 82 | if (et->et_checksum != ext4_extent_block_csum(inode, eh)) |
| 83 | return 0; |
| 84 | return 1; |
| 85 | } |
| 86 | |
| 87 | static void ext4_extent_block_csum_set(struct inode *inode, |
| 88 | struct ext4_extent_header *eh) |
| 89 | { |
| 90 | struct ext4_extent_tail *et; |
| 91 | |
| 92 | if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, |
| 93 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) |
| 94 | return; |
| 95 | |
| 96 | et = find_ext4_extent_tail(eh); |
| 97 | et->et_checksum = ext4_extent_block_csum(inode, eh); |
| 98 | } |
| 99 | |
Allison Henderson | d583fb8 | 2011-05-25 07:41:43 -0400 | [diff] [blame] | 100 | static int ext4_split_extent(handle_t *handle, |
| 101 | struct inode *inode, |
| 102 | struct ext4_ext_path *path, |
| 103 | struct ext4_map_blocks *map, |
| 104 | int split_flag, |
| 105 | int flags); |
| 106 | |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 107 | static int ext4_split_extent_at(handle_t *handle, |
| 108 | struct inode *inode, |
| 109 | struct ext4_ext_path *path, |
| 110 | ext4_lblk_t split, |
| 111 | int split_flag, |
| 112 | int flags); |
| 113 | |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 114 | static int ext4_find_delayed_extent(struct inode *inode, |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 115 | struct extent_status *newes); |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 116 | |
Jan Kara | 487caee | 2009-08-17 22:17:20 -0400 | [diff] [blame] | 117 | static int ext4_ext_truncate_extend_restart(handle_t *handle, |
| 118 | struct inode *inode, |
| 119 | int needed) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 120 | { |
| 121 | int err; |
| 122 | |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 123 | if (!ext4_handle_valid(handle)) |
| 124 | return 0; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 125 | if (handle->h_buffer_credits > needed) |
Shen Feng | 9102e4f | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 126 | return 0; |
| 127 | err = ext4_journal_extend(handle, needed); |
Theodore Ts'o | 0123c93 | 2008-08-01 20:57:54 -0400 | [diff] [blame] | 128 | if (err <= 0) |
Shen Feng | 9102e4f | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 129 | return err; |
Jan Kara | 487caee | 2009-08-17 22:17:20 -0400 | [diff] [blame] | 130 | err = ext4_truncate_restart_trans(handle, inode, needed); |
Dmitry Monakhov | 0617b83 | 2010-05-17 01:00:00 -0400 | [diff] [blame] | 131 | if (err == 0) |
| 132 | err = -EAGAIN; |
Jan Kara | 487caee | 2009-08-17 22:17:20 -0400 | [diff] [blame] | 133 | |
| 134 | return err; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 135 | } |
| 136 | |
| 137 | /* |
| 138 | * could return: |
| 139 | * - EROFS |
| 140 | * - ENOMEM |
| 141 | */ |
| 142 | static int ext4_ext_get_access(handle_t *handle, struct inode *inode, |
| 143 | struct ext4_ext_path *path) |
| 144 | { |
| 145 | if (path->p_bh) { |
| 146 | /* path points to block */ |
| 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; |
| 164 | if (path->p_bh) { |
Darrick J. Wong | 7ac5990 | 2012-04-29 18:37:10 -0400 | [diff] [blame] | 165 | ext4_extent_block_csum_set(inode, ext_block_hdr(path->p_bh)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 166 | /* path points to block */ |
Theodore Ts'o | 9ea7a0d | 2011-09-04 10:18:14 -0400 | [diff] [blame] | 167 | err = __ext4_handle_dirty_metadata(where, line, handle, |
| 168 | inode, path->p_bh); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 169 | } else { |
| 170 | /* path points to leaf/index in inode body */ |
| 171 | err = ext4_mark_inode_dirty(handle, inode); |
| 172 | } |
| 173 | return err; |
| 174 | } |
| 175 | |
Alex Tomas | f65e6fb | 2006-10-11 01:21:05 -0700 | [diff] [blame] | 176 | static ext4_fsblk_t ext4_ext_find_goal(struct inode *inode, |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 177 | struct ext4_ext_path *path, |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 178 | ext4_lblk_t block) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 179 | { |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 180 | if (path) { |
Yongqiang Yang | 81fdbb4 | 2011-10-29 09:23:38 -0400 | [diff] [blame] | 181 | int depth = path->p_depth; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 182 | struct ext4_extent *ex; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 183 | |
Kazuya Mio | ad4fb9c | 2011-01-10 12:12:28 -0500 | [diff] [blame] | 184 | /* |
| 185 | * Try to predict block placement assuming that we are |
| 186 | * filling in a file which will eventually be |
| 187 | * non-sparse --- i.e., in the case of libbfd writing |
| 188 | * an ELF object sections out-of-order but in a way |
| 189 | * the eventually results in a contiguous object or |
| 190 | * executable file, or some database extending a table |
| 191 | * space file. However, this is actually somewhat |
| 192 | * non-ideal if we are writing a sparse file such as |
| 193 | * qemu or KVM writing a raw image file that is going |
| 194 | * to stay fairly sparse, since it will end up |
| 195 | * fragmenting the file system's free space. Maybe we |
| 196 | * should have some hueristics or some way to allow |
| 197 | * userspace to pass a hint to file system, |
Tao Ma | b8d6568 | 2011-01-21 23:21:31 +0800 | [diff] [blame] | 198 | * especially if the latter case turns out to be |
Kazuya Mio | ad4fb9c | 2011-01-10 12:12:28 -0500 | [diff] [blame] | 199 | * common. |
| 200 | */ |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 201 | ex = path[depth].p_ext; |
Kazuya Mio | ad4fb9c | 2011-01-10 12:12:28 -0500 | [diff] [blame] | 202 | if (ex) { |
| 203 | ext4_fsblk_t ext_pblk = ext4_ext_pblock(ex); |
| 204 | ext4_lblk_t ext_block = le32_to_cpu(ex->ee_block); |
| 205 | |
| 206 | if (block > ext_block) |
| 207 | return ext_pblk + (block - ext_block); |
| 208 | else |
| 209 | return ext_pblk - (ext_block - block); |
| 210 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 211 | |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 212 | /* it looks like index is empty; |
| 213 | * try to find starting block from index itself */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 214 | if (path[depth].p_bh) |
| 215 | return path[depth].p_bh->b_blocknr; |
| 216 | } |
| 217 | |
| 218 | /* OK. use inode's group */ |
Eric Sandeen | f86186b | 2011-06-28 10:01:31 -0400 | [diff] [blame] | 219 | return ext4_inode_to_goal_block(inode); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 220 | } |
| 221 | |
Aneesh Kumar K.V | 654b490 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 222 | /* |
| 223 | * Allocation for a meta data block |
| 224 | */ |
Alex Tomas | f65e6fb | 2006-10-11 01:21:05 -0700 | [diff] [blame] | 225 | static ext4_fsblk_t |
Aneesh Kumar K.V | 654b490 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 226 | ext4_ext_new_meta_block(handle_t *handle, struct inode *inode, |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 227 | struct ext4_ext_path *path, |
Allison Henderson | 55f020d | 2011-05-25 07:41:26 -0400 | [diff] [blame] | 228 | struct ext4_extent *ex, int *err, unsigned int flags) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 229 | { |
Alex Tomas | f65e6fb | 2006-10-11 01:21:05 -0700 | [diff] [blame] | 230 | ext4_fsblk_t goal, newblock; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 231 | |
| 232 | 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] | 233 | newblock = ext4_new_meta_blocks(handle, inode, goal, flags, |
| 234 | NULL, err); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 235 | return newblock; |
| 236 | } |
| 237 | |
Theodore Ts'o | 55ad63b | 2009-08-28 10:40:33 -0400 | [diff] [blame] | 238 | static inline int ext4_ext_space_block(struct inode *inode, int check) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 239 | { |
| 240 | int size; |
| 241 | |
| 242 | size = (inode->i_sb->s_blocksize - sizeof(struct ext4_extent_header)) |
| 243 | / sizeof(struct ext4_extent); |
Robert P. J. Day | bbf2f9f | 2007-02-17 19:20:16 +0100 | [diff] [blame] | 244 | #ifdef AGGRESSIVE_TEST |
Yongqiang Yang | 02dc62fb | 2011-10-29 09:29:11 -0400 | [diff] [blame] | 245 | if (!check && size > 6) |
| 246 | size = 6; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 247 | #endif |
| 248 | return size; |
| 249 | } |
| 250 | |
Theodore Ts'o | 55ad63b | 2009-08-28 10:40:33 -0400 | [diff] [blame] | 251 | 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] | 252 | { |
| 253 | int size; |
| 254 | |
| 255 | size = (inode->i_sb->s_blocksize - sizeof(struct ext4_extent_header)) |
| 256 | / sizeof(struct ext4_extent_idx); |
Robert P. J. Day | bbf2f9f | 2007-02-17 19:20:16 +0100 | [diff] [blame] | 257 | #ifdef AGGRESSIVE_TEST |
Yongqiang Yang | 02dc62fb | 2011-10-29 09:29:11 -0400 | [diff] [blame] | 258 | if (!check && size > 5) |
| 259 | size = 5; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 260 | #endif |
| 261 | return size; |
| 262 | } |
| 263 | |
Theodore Ts'o | 55ad63b | 2009-08-28 10:40:33 -0400 | [diff] [blame] | 264 | static inline int ext4_ext_space_root(struct inode *inode, int check) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 265 | { |
| 266 | int size; |
| 267 | |
| 268 | size = sizeof(EXT4_I(inode)->i_data); |
| 269 | size -= sizeof(struct ext4_extent_header); |
| 270 | size /= sizeof(struct ext4_extent); |
Robert P. J. Day | bbf2f9f | 2007-02-17 19:20:16 +0100 | [diff] [blame] | 271 | #ifdef AGGRESSIVE_TEST |
Yongqiang Yang | 02dc62fb | 2011-10-29 09:29:11 -0400 | [diff] [blame] | 272 | if (!check && size > 3) |
| 273 | size = 3; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 274 | #endif |
| 275 | return size; |
| 276 | } |
| 277 | |
Theodore Ts'o | 55ad63b | 2009-08-28 10:40:33 -0400 | [diff] [blame] | 278 | 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] | 279 | { |
| 280 | int size; |
| 281 | |
| 282 | size = sizeof(EXT4_I(inode)->i_data); |
| 283 | size -= sizeof(struct ext4_extent_header); |
| 284 | size /= sizeof(struct ext4_extent_idx); |
Robert P. J. Day | bbf2f9f | 2007-02-17 19:20:16 +0100 | [diff] [blame] | 285 | #ifdef AGGRESSIVE_TEST |
Yongqiang Yang | 02dc62fb | 2011-10-29 09:29:11 -0400 | [diff] [blame] | 286 | if (!check && size > 4) |
| 287 | size = 4; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 288 | #endif |
| 289 | return size; |
| 290 | } |
| 291 | |
Mingming Cao | d2a1763 | 2008-07-14 17:52:37 -0400 | [diff] [blame] | 292 | /* |
| 293 | * Calculate the number of metadata blocks needed |
| 294 | * to allocate @blocks |
| 295 | * Worse case is one block per extent |
| 296 | */ |
Theodore Ts'o | 01f49d0 | 2011-01-10 12:13:03 -0500 | [diff] [blame] | 297 | 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] | 298 | { |
Theodore Ts'o | 9d0be50 | 2010-01-01 02:41:30 -0500 | [diff] [blame] | 299 | struct ext4_inode_info *ei = EXT4_I(inode); |
Yongqiang Yang | 81fdbb4 | 2011-10-29 09:23:38 -0400 | [diff] [blame] | 300 | int idxs; |
Mingming Cao | d2a1763 | 2008-07-14 17:52:37 -0400 | [diff] [blame] | 301 | |
Theodore Ts'o | 9d0be50 | 2010-01-01 02:41:30 -0500 | [diff] [blame] | 302 | idxs = ((inode->i_sb->s_blocksize - sizeof(struct ext4_extent_header)) |
| 303 | / sizeof(struct ext4_extent_idx)); |
Mingming Cao | d2a1763 | 2008-07-14 17:52:37 -0400 | [diff] [blame] | 304 | |
| 305 | /* |
Theodore Ts'o | 9d0be50 | 2010-01-01 02:41:30 -0500 | [diff] [blame] | 306 | * If the new delayed allocation block is contiguous with the |
| 307 | * previous da block, it can share index blocks with the |
| 308 | * previous block, so we only need to allocate a new index |
| 309 | * block every idxs leaf blocks. At ldxs**2 blocks, we need |
| 310 | * an additional index block, and at ldxs**3 blocks, yet |
| 311 | * another index blocks. |
Mingming Cao | d2a1763 | 2008-07-14 17:52:37 -0400 | [diff] [blame] | 312 | */ |
Theodore Ts'o | 9d0be50 | 2010-01-01 02:41:30 -0500 | [diff] [blame] | 313 | if (ei->i_da_metadata_calc_len && |
| 314 | ei->i_da_metadata_calc_last_lblock+1 == lblock) { |
Yongqiang Yang | 81fdbb4 | 2011-10-29 09:23:38 -0400 | [diff] [blame] | 315 | int num = 0; |
| 316 | |
Theodore Ts'o | 9d0be50 | 2010-01-01 02:41:30 -0500 | [diff] [blame] | 317 | if ((ei->i_da_metadata_calc_len % idxs) == 0) |
| 318 | num++; |
| 319 | if ((ei->i_da_metadata_calc_len % (idxs*idxs)) == 0) |
| 320 | num++; |
| 321 | if ((ei->i_da_metadata_calc_len % (idxs*idxs*idxs)) == 0) { |
| 322 | num++; |
| 323 | ei->i_da_metadata_calc_len = 0; |
| 324 | } else |
| 325 | ei->i_da_metadata_calc_len++; |
| 326 | ei->i_da_metadata_calc_last_lblock++; |
| 327 | return num; |
| 328 | } |
Mingming Cao | d2a1763 | 2008-07-14 17:52:37 -0400 | [diff] [blame] | 329 | |
Theodore Ts'o | 9d0be50 | 2010-01-01 02:41:30 -0500 | [diff] [blame] | 330 | /* |
| 331 | * In the worst case we need a new set of index blocks at |
| 332 | * every level of the inode's extent tree. |
| 333 | */ |
| 334 | ei->i_da_metadata_calc_len = 1; |
| 335 | ei->i_da_metadata_calc_last_lblock = lblock; |
| 336 | return ext_depth(inode) + 1; |
Mingming Cao | d2a1763 | 2008-07-14 17:52:37 -0400 | [diff] [blame] | 337 | } |
| 338 | |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 339 | static int |
| 340 | ext4_ext_max_entries(struct inode *inode, int depth) |
| 341 | { |
| 342 | int max; |
| 343 | |
| 344 | if (depth == ext_depth(inode)) { |
| 345 | if (depth == 0) |
Theodore Ts'o | 55ad63b | 2009-08-28 10:40:33 -0400 | [diff] [blame] | 346 | max = ext4_ext_space_root(inode, 1); |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 347 | else |
Theodore Ts'o | 55ad63b | 2009-08-28 10:40:33 -0400 | [diff] [blame] | 348 | max = ext4_ext_space_root_idx(inode, 1); |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 349 | } else { |
| 350 | if (depth == 0) |
Theodore Ts'o | 55ad63b | 2009-08-28 10:40:33 -0400 | [diff] [blame] | 351 | max = ext4_ext_space_block(inode, 1); |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 352 | else |
Theodore Ts'o | 55ad63b | 2009-08-28 10:40:33 -0400 | [diff] [blame] | 353 | max = ext4_ext_space_block_idx(inode, 1); |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 354 | } |
| 355 | |
| 356 | return max; |
| 357 | } |
| 358 | |
Aneesh Kumar K.V | 56b1986 | 2009-03-12 09:51:20 -0400 | [diff] [blame] | 359 | static int ext4_valid_extent(struct inode *inode, struct ext4_extent *ext) |
| 360 | { |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 361 | ext4_fsblk_t block = ext4_ext_pblock(ext); |
Aneesh Kumar K.V | 56b1986 | 2009-03-12 09:51:20 -0400 | [diff] [blame] | 362 | int len = ext4_ext_get_actual_len(ext); |
Theodore Ts'o | e84a26c | 2009-04-22 20:52:25 -0400 | [diff] [blame] | 363 | |
Theodore Ts'o | 31d4f3a | 2012-03-11 23:30:16 -0400 | [diff] [blame] | 364 | if (len == 0) |
| 365 | return 0; |
Theodore Ts'o | 6fd058f | 2009-05-17 15:38:01 -0400 | [diff] [blame] | 366 | 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] | 367 | } |
| 368 | |
| 369 | static int ext4_valid_extent_idx(struct inode *inode, |
| 370 | struct ext4_extent_idx *ext_idx) |
| 371 | { |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 372 | ext4_fsblk_t block = ext4_idx_pblock(ext_idx); |
Theodore Ts'o | e84a26c | 2009-04-22 20:52:25 -0400 | [diff] [blame] | 373 | |
Theodore Ts'o | 6fd058f | 2009-05-17 15:38:01 -0400 | [diff] [blame] | 374 | 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] | 375 | } |
| 376 | |
| 377 | static int ext4_valid_extent_entries(struct inode *inode, |
| 378 | struct ext4_extent_header *eh, |
| 379 | int depth) |
| 380 | { |
Aneesh Kumar K.V | 56b1986 | 2009-03-12 09:51:20 -0400 | [diff] [blame] | 381 | unsigned short entries; |
| 382 | if (eh->eh_entries == 0) |
| 383 | return 1; |
| 384 | |
| 385 | entries = le16_to_cpu(eh->eh_entries); |
| 386 | |
| 387 | if (depth == 0) { |
| 388 | /* leaf entries */ |
Yongqiang Yang | 81fdbb4 | 2011-10-29 09:23:38 -0400 | [diff] [blame] | 389 | struct ext4_extent *ext = EXT_FIRST_EXTENT(eh); |
Aneesh Kumar K.V | 56b1986 | 2009-03-12 09:51:20 -0400 | [diff] [blame] | 390 | while (entries) { |
| 391 | if (!ext4_valid_extent(inode, ext)) |
| 392 | return 0; |
| 393 | ext++; |
| 394 | entries--; |
| 395 | } |
| 396 | } else { |
Yongqiang Yang | 81fdbb4 | 2011-10-29 09:23:38 -0400 | [diff] [blame] | 397 | struct ext4_extent_idx *ext_idx = EXT_FIRST_INDEX(eh); |
Aneesh Kumar K.V | 56b1986 | 2009-03-12 09:51:20 -0400 | [diff] [blame] | 398 | while (entries) { |
| 399 | if (!ext4_valid_extent_idx(inode, ext_idx)) |
| 400 | return 0; |
| 401 | ext_idx++; |
| 402 | entries--; |
| 403 | } |
| 404 | } |
| 405 | return 1; |
| 406 | } |
| 407 | |
Theodore Ts'o | c398eda | 2010-07-27 11:56:40 -0400 | [diff] [blame] | 408 | static int __ext4_ext_check(const char *function, unsigned int line, |
| 409 | struct inode *inode, struct ext4_extent_header *eh, |
Theodore Ts'o | c349179 | 2013-08-16 21:21:41 -0400 | [diff] [blame] | 410 | int depth, ext4_fsblk_t pblk) |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 411 | { |
| 412 | const char *error_msg; |
| 413 | int max = 0; |
| 414 | |
| 415 | if (unlikely(eh->eh_magic != EXT4_EXT_MAGIC)) { |
| 416 | error_msg = "invalid magic"; |
| 417 | goto corrupted; |
| 418 | } |
| 419 | if (unlikely(le16_to_cpu(eh->eh_depth) != depth)) { |
| 420 | error_msg = "unexpected eh_depth"; |
| 421 | goto corrupted; |
| 422 | } |
| 423 | if (unlikely(eh->eh_max == 0)) { |
| 424 | error_msg = "invalid eh_max"; |
| 425 | goto corrupted; |
| 426 | } |
| 427 | max = ext4_ext_max_entries(inode, depth); |
| 428 | if (unlikely(le16_to_cpu(eh->eh_max) > max)) { |
| 429 | error_msg = "too large eh_max"; |
| 430 | goto corrupted; |
| 431 | } |
| 432 | if (unlikely(le16_to_cpu(eh->eh_entries) > le16_to_cpu(eh->eh_max))) { |
| 433 | error_msg = "invalid eh_entries"; |
| 434 | goto corrupted; |
| 435 | } |
Aneesh Kumar K.V | 56b1986 | 2009-03-12 09:51:20 -0400 | [diff] [blame] | 436 | if (!ext4_valid_extent_entries(inode, eh, depth)) { |
| 437 | error_msg = "invalid extent entries"; |
| 438 | goto corrupted; |
| 439 | } |
Darrick J. Wong | 7ac5990 | 2012-04-29 18:37:10 -0400 | [diff] [blame] | 440 | /* Verify checksum on non-root extent tree nodes */ |
| 441 | if (ext_depth(inode) != depth && |
| 442 | !ext4_extent_block_csum_verify(inode, eh)) { |
| 443 | error_msg = "extent tree corrupted"; |
| 444 | goto corrupted; |
| 445 | } |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 446 | return 0; |
| 447 | |
| 448 | corrupted: |
Theodore Ts'o | c398eda | 2010-07-27 11:56:40 -0400 | [diff] [blame] | 449 | ext4_error_inode(inode, function, line, 0, |
Theodore Ts'o | c349179 | 2013-08-16 21:21:41 -0400 | [diff] [blame] | 450 | "pblk %llu bad header/extent: %s - magic %x, " |
| 451 | "entries %u, max %u(%u), depth %u(%u)", |
| 452 | (unsigned long long) pblk, error_msg, |
| 453 | le16_to_cpu(eh->eh_magic), |
| 454 | le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max), |
| 455 | max, le16_to_cpu(eh->eh_depth), depth); |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 456 | return -EIO; |
| 457 | } |
| 458 | |
Theodore Ts'o | c349179 | 2013-08-16 21:21:41 -0400 | [diff] [blame] | 459 | #define ext4_ext_check(inode, eh, depth, pblk) \ |
| 460 | __ext4_ext_check(__func__, __LINE__, (inode), (eh), (depth), (pblk)) |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 461 | |
Aneesh Kumar K.V | 7a262f7 | 2009-03-27 16:39:58 -0400 | [diff] [blame] | 462 | int ext4_ext_check_inode(struct inode *inode) |
| 463 | { |
Theodore Ts'o | c349179 | 2013-08-16 21:21:41 -0400 | [diff] [blame] | 464 | 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] | 465 | } |
| 466 | |
Theodore Ts'o | 7d7ea89 | 2013-08-16 21:20:41 -0400 | [diff] [blame] | 467 | static struct buffer_head * |
| 468 | __read_extent_tree_block(const char *function, unsigned int line, |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 469 | struct inode *inode, ext4_fsblk_t pblk, int depth, |
| 470 | int flags) |
Darrick J. Wong | f848912 | 2012-04-29 18:21:10 -0400 | [diff] [blame] | 471 | { |
Theodore Ts'o | 7d7ea89 | 2013-08-16 21:20:41 -0400 | [diff] [blame] | 472 | struct buffer_head *bh; |
| 473 | int err; |
Darrick J. Wong | f848912 | 2012-04-29 18:21:10 -0400 | [diff] [blame] | 474 | |
Theodore Ts'o | 7d7ea89 | 2013-08-16 21:20:41 -0400 | [diff] [blame] | 475 | bh = sb_getblk(inode->i_sb, pblk); |
| 476 | if (unlikely(!bh)) |
| 477 | return ERR_PTR(-ENOMEM); |
| 478 | |
| 479 | if (!bh_uptodate_or_lock(bh)) { |
| 480 | trace_ext4_ext_load_extent(inode, pblk, _RET_IP_); |
| 481 | err = bh_submit_read(bh); |
| 482 | if (err < 0) |
| 483 | goto errout; |
| 484 | } |
Theodore Ts'o | 7869a4a | 2013-08-16 22:05:14 -0400 | [diff] [blame] | 485 | if (buffer_verified(bh) && !(flags & EXT4_EX_FORCE_CACHE)) |
Theodore Ts'o | 7d7ea89 | 2013-08-16 21:20:41 -0400 | [diff] [blame] | 486 | return bh; |
| 487 | err = __ext4_ext_check(function, line, inode, |
Theodore Ts'o | c349179 | 2013-08-16 21:21:41 -0400 | [diff] [blame] | 488 | ext_block_hdr(bh), depth, pblk); |
Theodore Ts'o | 7d7ea89 | 2013-08-16 21:20:41 -0400 | [diff] [blame] | 489 | if (err) |
| 490 | goto errout; |
Darrick J. Wong | f848912 | 2012-04-29 18:21:10 -0400 | [diff] [blame] | 491 | set_buffer_verified(bh); |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 492 | /* |
| 493 | * If this is a leaf block, cache all of its entries |
| 494 | */ |
| 495 | if (!(flags & EXT4_EX_NOCACHE) && depth == 0) { |
| 496 | struct ext4_extent_header *eh = ext_block_hdr(bh); |
| 497 | struct ext4_extent *ex = EXT_FIRST_EXTENT(eh); |
| 498 | ext4_lblk_t prev = 0; |
| 499 | int i; |
| 500 | |
| 501 | for (i = le16_to_cpu(eh->eh_entries); i > 0; i--, ex++) { |
| 502 | unsigned int status = EXTENT_STATUS_WRITTEN; |
| 503 | ext4_lblk_t lblk = le32_to_cpu(ex->ee_block); |
| 504 | int len = ext4_ext_get_actual_len(ex); |
| 505 | |
| 506 | if (prev && (prev != lblk)) |
| 507 | ext4_es_cache_extent(inode, prev, |
| 508 | lblk - prev, ~0, |
| 509 | EXTENT_STATUS_HOLE); |
| 510 | |
| 511 | if (ext4_ext_is_uninitialized(ex)) |
| 512 | status = EXTENT_STATUS_UNWRITTEN; |
| 513 | ext4_es_cache_extent(inode, lblk, len, |
| 514 | ext4_ext_pblock(ex), status); |
| 515 | prev = lblk + len; |
| 516 | } |
| 517 | } |
Theodore Ts'o | 7d7ea89 | 2013-08-16 21:20:41 -0400 | [diff] [blame] | 518 | return bh; |
| 519 | errout: |
| 520 | put_bh(bh); |
| 521 | return ERR_PTR(err); |
| 522 | |
Darrick J. Wong | f848912 | 2012-04-29 18:21:10 -0400 | [diff] [blame] | 523 | } |
| 524 | |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 525 | #define read_extent_tree_block(inode, pblk, depth, flags) \ |
| 526 | __read_extent_tree_block(__func__, __LINE__, (inode), (pblk), \ |
| 527 | (depth), (flags)) |
Darrick J. Wong | f848912 | 2012-04-29 18:21:10 -0400 | [diff] [blame] | 528 | |
Theodore Ts'o | 7869a4a | 2013-08-16 22:05:14 -0400 | [diff] [blame] | 529 | /* |
| 530 | * This function is called to cache a file's extent information in the |
| 531 | * extent status tree |
| 532 | */ |
| 533 | int ext4_ext_precache(struct inode *inode) |
| 534 | { |
| 535 | struct ext4_inode_info *ei = EXT4_I(inode); |
| 536 | struct ext4_ext_path *path = NULL; |
| 537 | struct buffer_head *bh; |
| 538 | int i = 0, depth, ret = 0; |
| 539 | |
| 540 | if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) |
| 541 | return 0; /* not an extent-mapped inode */ |
| 542 | |
| 543 | down_read(&ei->i_data_sem); |
| 544 | depth = ext_depth(inode); |
| 545 | |
| 546 | path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 1), |
| 547 | GFP_NOFS); |
| 548 | if (path == NULL) { |
| 549 | up_read(&ei->i_data_sem); |
| 550 | return -ENOMEM; |
| 551 | } |
| 552 | |
| 553 | /* Don't cache anything if there are no external extent blocks */ |
| 554 | if (depth == 0) |
| 555 | goto out; |
| 556 | path[0].p_hdr = ext_inode_hdr(inode); |
| 557 | ret = ext4_ext_check(inode, path[0].p_hdr, depth, 0); |
| 558 | if (ret) |
| 559 | goto out; |
| 560 | path[0].p_idx = EXT_FIRST_INDEX(path[0].p_hdr); |
| 561 | while (i >= 0) { |
| 562 | /* |
| 563 | * If this is a leaf block or we've reached the end of |
| 564 | * the index block, go up |
| 565 | */ |
| 566 | if ((i == depth) || |
| 567 | path[i].p_idx > EXT_LAST_INDEX(path[i].p_hdr)) { |
| 568 | brelse(path[i].p_bh); |
| 569 | path[i].p_bh = NULL; |
| 570 | i--; |
| 571 | continue; |
| 572 | } |
| 573 | bh = read_extent_tree_block(inode, |
| 574 | ext4_idx_pblock(path[i].p_idx++), |
| 575 | depth - i - 1, |
| 576 | EXT4_EX_FORCE_CACHE); |
| 577 | if (IS_ERR(bh)) { |
| 578 | ret = PTR_ERR(bh); |
| 579 | break; |
| 580 | } |
| 581 | i++; |
| 582 | path[i].p_bh = bh; |
| 583 | path[i].p_hdr = ext_block_hdr(bh); |
| 584 | path[i].p_idx = EXT_FIRST_INDEX(path[i].p_hdr); |
| 585 | } |
| 586 | ext4_set_inode_state(inode, EXT4_STATE_EXT_PRECACHED); |
| 587 | out: |
| 588 | up_read(&ei->i_data_sem); |
| 589 | ext4_ext_drop_refs(path); |
| 590 | kfree(path); |
| 591 | return ret; |
| 592 | } |
| 593 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 594 | #ifdef EXT_DEBUG |
| 595 | static void ext4_ext_show_path(struct inode *inode, struct ext4_ext_path *path) |
| 596 | { |
| 597 | int k, l = path->p_depth; |
| 598 | |
| 599 | ext_debug("path:"); |
| 600 | for (k = 0; k <= l; k++, path++) { |
| 601 | if (path->p_idx) { |
Mingming Cao | 2ae0210 | 2006-10-11 01:21:11 -0700 | [diff] [blame] | 602 | 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] | 603 | ext4_idx_pblock(path->p_idx)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 604 | } else if (path->p_ext) { |
Mingming | 553f900 | 2009-09-18 13:34:55 -0400 | [diff] [blame] | 605 | ext_debug(" %d:[%d]%d:%llu ", |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 606 | le32_to_cpu(path->p_ext->ee_block), |
Mingming | 553f900 | 2009-09-18 13:34:55 -0400 | [diff] [blame] | 607 | ext4_ext_is_uninitialized(path->p_ext), |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 608 | ext4_ext_get_actual_len(path->p_ext), |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 609 | ext4_ext_pblock(path->p_ext)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 610 | } else |
| 611 | ext_debug(" []"); |
| 612 | } |
| 613 | ext_debug("\n"); |
| 614 | } |
| 615 | |
| 616 | static void ext4_ext_show_leaf(struct inode *inode, struct ext4_ext_path *path) |
| 617 | { |
| 618 | int depth = ext_depth(inode); |
| 619 | struct ext4_extent_header *eh; |
| 620 | struct ext4_extent *ex; |
| 621 | int i; |
| 622 | |
| 623 | if (!path) |
| 624 | return; |
| 625 | |
| 626 | eh = path[depth].p_hdr; |
| 627 | ex = EXT_FIRST_EXTENT(eh); |
| 628 | |
Mingming | 553f900 | 2009-09-18 13:34:55 -0400 | [diff] [blame] | 629 | ext_debug("Displaying leaf extents for inode %lu\n", inode->i_ino); |
| 630 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 631 | for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ex++) { |
Mingming | 553f900 | 2009-09-18 13:34:55 -0400 | [diff] [blame] | 632 | ext_debug("%d:[%d]%d:%llu ", le32_to_cpu(ex->ee_block), |
| 633 | ext4_ext_is_uninitialized(ex), |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 634 | ext4_ext_get_actual_len(ex), ext4_ext_pblock(ex)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 635 | } |
| 636 | ext_debug("\n"); |
| 637 | } |
Yongqiang Yang | 1b16da7 | 2011-05-25 17:41:48 -0400 | [diff] [blame] | 638 | |
| 639 | static void ext4_ext_show_move(struct inode *inode, struct ext4_ext_path *path, |
| 640 | ext4_fsblk_t newblock, int level) |
| 641 | { |
| 642 | int depth = ext_depth(inode); |
| 643 | struct ext4_extent *ex; |
| 644 | |
| 645 | if (depth != level) { |
| 646 | struct ext4_extent_idx *idx; |
| 647 | idx = path[level].p_idx; |
| 648 | while (idx <= EXT_MAX_INDEX(path[level].p_hdr)) { |
| 649 | ext_debug("%d: move %d:%llu in new index %llu\n", level, |
| 650 | le32_to_cpu(idx->ei_block), |
| 651 | ext4_idx_pblock(idx), |
| 652 | newblock); |
| 653 | idx++; |
| 654 | } |
| 655 | |
| 656 | return; |
| 657 | } |
| 658 | |
| 659 | ex = path[depth].p_ext; |
| 660 | while (ex <= EXT_MAX_EXTENT(path[depth].p_hdr)) { |
| 661 | ext_debug("move %d:%llu:[%d]%d in new leaf %llu\n", |
| 662 | le32_to_cpu(ex->ee_block), |
| 663 | ext4_ext_pblock(ex), |
| 664 | ext4_ext_is_uninitialized(ex), |
| 665 | ext4_ext_get_actual_len(ex), |
| 666 | newblock); |
| 667 | ex++; |
| 668 | } |
| 669 | } |
| 670 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 671 | #else |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 672 | #define ext4_ext_show_path(inode, path) |
| 673 | #define ext4_ext_show_leaf(inode, path) |
Yongqiang Yang | 1b16da7 | 2011-05-25 17:41:48 -0400 | [diff] [blame] | 674 | #define ext4_ext_show_move(inode, path, newblock, level) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 675 | #endif |
| 676 | |
Aneesh Kumar K.V | b35905c | 2008-02-25 16:54:37 -0500 | [diff] [blame] | 677 | void ext4_ext_drop_refs(struct ext4_ext_path *path) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 678 | { |
| 679 | int depth = path->p_depth; |
| 680 | int i; |
| 681 | |
| 682 | for (i = 0; i <= depth; i++, path++) |
| 683 | if (path->p_bh) { |
| 684 | brelse(path->p_bh); |
| 685 | path->p_bh = NULL; |
| 686 | } |
| 687 | } |
| 688 | |
| 689 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 690 | * ext4_ext_binsearch_idx: |
| 691 | * binary search for the closest index of the given block |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 692 | * the header must be checked before calling this |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 693 | */ |
| 694 | static void |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 695 | ext4_ext_binsearch_idx(struct inode *inode, |
| 696 | struct ext4_ext_path *path, ext4_lblk_t block) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 697 | { |
| 698 | struct ext4_extent_header *eh = path->p_hdr; |
| 699 | struct ext4_extent_idx *r, *l, *m; |
| 700 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 701 | |
Eric Sandeen | bba9074 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 702 | ext_debug("binsearch for %u(idx): ", block); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 703 | |
| 704 | l = EXT_FIRST_INDEX(eh) + 1; |
Dmitry Monakhov | e9f410b | 2007-07-18 09:09:15 -0400 | [diff] [blame] | 705 | r = EXT_LAST_INDEX(eh); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 706 | while (l <= r) { |
| 707 | m = l + (r - l) / 2; |
| 708 | if (block < le32_to_cpu(m->ei_block)) |
| 709 | r = m - 1; |
| 710 | else |
| 711 | l = m + 1; |
Dmitry Monakhov | 26d535e | 2007-07-18 08:33:37 -0400 | [diff] [blame] | 712 | ext_debug("%p(%u):%p(%u):%p(%u) ", l, le32_to_cpu(l->ei_block), |
| 713 | m, le32_to_cpu(m->ei_block), |
| 714 | r, le32_to_cpu(r->ei_block)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 715 | } |
| 716 | |
| 717 | path->p_idx = l - 1; |
Zheng Liu | 4a3c3a5 | 2012-05-28 17:55:16 -0400 | [diff] [blame] | 718 | 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] | 719 | ext4_idx_pblock(path->p_idx)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 720 | |
| 721 | #ifdef CHECK_BINSEARCH |
| 722 | { |
| 723 | struct ext4_extent_idx *chix, *ix; |
| 724 | int k; |
| 725 | |
| 726 | chix = ix = EXT_FIRST_INDEX(eh); |
| 727 | for (k = 0; k < le16_to_cpu(eh->eh_entries); k++, ix++) { |
| 728 | if (k != 0 && |
| 729 | 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] | 730 | printk(KERN_DEBUG "k=%d, ix=0x%p, " |
| 731 | "first=0x%p\n", k, |
| 732 | ix, EXT_FIRST_INDEX(eh)); |
| 733 | printk(KERN_DEBUG "%u <= %u\n", |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 734 | le32_to_cpu(ix->ei_block), |
| 735 | le32_to_cpu(ix[-1].ei_block)); |
| 736 | } |
| 737 | BUG_ON(k && le32_to_cpu(ix->ei_block) |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 738 | <= le32_to_cpu(ix[-1].ei_block)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 739 | if (block < le32_to_cpu(ix->ei_block)) |
| 740 | break; |
| 741 | chix = ix; |
| 742 | } |
| 743 | BUG_ON(chix != path->p_idx); |
| 744 | } |
| 745 | #endif |
| 746 | |
| 747 | } |
| 748 | |
| 749 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 750 | * ext4_ext_binsearch: |
| 751 | * binary search for closest extent of the given block |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 752 | * the header must be checked before calling this |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 753 | */ |
| 754 | static void |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 755 | ext4_ext_binsearch(struct inode *inode, |
| 756 | struct ext4_ext_path *path, ext4_lblk_t block) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 757 | { |
| 758 | struct ext4_extent_header *eh = path->p_hdr; |
| 759 | struct ext4_extent *r, *l, *m; |
| 760 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 761 | if (eh->eh_entries == 0) { |
| 762 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 763 | * this leaf is empty: |
| 764 | * we get such a leaf in split/add case |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 765 | */ |
| 766 | return; |
| 767 | } |
| 768 | |
Eric Sandeen | bba9074 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 769 | ext_debug("binsearch for %u: ", block); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 770 | |
| 771 | l = EXT_FIRST_EXTENT(eh) + 1; |
Dmitry Monakhov | e9f410b | 2007-07-18 09:09:15 -0400 | [diff] [blame] | 772 | r = EXT_LAST_EXTENT(eh); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 773 | |
| 774 | while (l <= r) { |
| 775 | m = l + (r - l) / 2; |
| 776 | if (block < le32_to_cpu(m->ee_block)) |
| 777 | r = m - 1; |
| 778 | else |
| 779 | l = m + 1; |
Dmitry Monakhov | 26d535e | 2007-07-18 08:33:37 -0400 | [diff] [blame] | 780 | ext_debug("%p(%u):%p(%u):%p(%u) ", l, le32_to_cpu(l->ee_block), |
| 781 | m, le32_to_cpu(m->ee_block), |
| 782 | r, le32_to_cpu(r->ee_block)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 783 | } |
| 784 | |
| 785 | path->p_ext = l - 1; |
Mingming | 553f900 | 2009-09-18 13:34:55 -0400 | [diff] [blame] | 786 | ext_debug(" -> %d:%llu:[%d]%d ", |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 787 | le32_to_cpu(path->p_ext->ee_block), |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 788 | ext4_ext_pblock(path->p_ext), |
Mingming | 553f900 | 2009-09-18 13:34:55 -0400 | [diff] [blame] | 789 | ext4_ext_is_uninitialized(path->p_ext), |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 790 | ext4_ext_get_actual_len(path->p_ext)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 791 | |
| 792 | #ifdef CHECK_BINSEARCH |
| 793 | { |
| 794 | struct ext4_extent *chex, *ex; |
| 795 | int k; |
| 796 | |
| 797 | chex = ex = EXT_FIRST_EXTENT(eh); |
| 798 | for (k = 0; k < le16_to_cpu(eh->eh_entries); k++, ex++) { |
| 799 | BUG_ON(k && le32_to_cpu(ex->ee_block) |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 800 | <= le32_to_cpu(ex[-1].ee_block)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 801 | if (block < le32_to_cpu(ex->ee_block)) |
| 802 | break; |
| 803 | chex = ex; |
| 804 | } |
| 805 | BUG_ON(chex != path->p_ext); |
| 806 | } |
| 807 | #endif |
| 808 | |
| 809 | } |
| 810 | |
| 811 | int ext4_ext_tree_init(handle_t *handle, struct inode *inode) |
| 812 | { |
| 813 | struct ext4_extent_header *eh; |
| 814 | |
| 815 | eh = ext_inode_hdr(inode); |
| 816 | eh->eh_depth = 0; |
| 817 | eh->eh_entries = 0; |
| 818 | eh->eh_magic = EXT4_EXT_MAGIC; |
Theodore Ts'o | 55ad63b | 2009-08-28 10:40:33 -0400 | [diff] [blame] | 819 | eh->eh_max = cpu_to_le16(ext4_ext_space_root(inode, 0)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 820 | ext4_mark_inode_dirty(handle, inode); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 821 | return 0; |
| 822 | } |
| 823 | |
| 824 | struct ext4_ext_path * |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 825 | ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block, |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 826 | struct ext4_ext_path *path, int flags) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 827 | { |
| 828 | struct ext4_extent_header *eh; |
| 829 | struct buffer_head *bh; |
| 830 | short int depth, i, ppos = 0, alloc = 0; |
Theodore Ts'o | 860d21e | 2013-01-12 16:19:36 -0500 | [diff] [blame] | 831 | int ret; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 832 | |
| 833 | eh = ext_inode_hdr(inode); |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 834 | depth = ext_depth(inode); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 835 | |
| 836 | /* account possible depth increase */ |
| 837 | if (!path) { |
Avantika Mathur | 5d4958f | 2006-12-06 20:41:35 -0800 | [diff] [blame] | 838 | path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 2), |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 839 | GFP_NOFS); |
| 840 | if (!path) |
| 841 | return ERR_PTR(-ENOMEM); |
| 842 | alloc = 1; |
| 843 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 844 | path[0].p_hdr = eh; |
Shen Feng | 1973adc | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 845 | path[0].p_bh = NULL; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 846 | |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 847 | i = depth; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 848 | /* walk through the tree */ |
| 849 | while (i) { |
| 850 | ext_debug("depth %d: num %d, max %d\n", |
| 851 | 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] | 852 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 853 | ext4_ext_binsearch_idx(inode, path + ppos, block); |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 854 | path[ppos].p_block = ext4_idx_pblock(path[ppos].p_idx); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 855 | path[ppos].p_depth = i; |
| 856 | path[ppos].p_ext = NULL; |
| 857 | |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 858 | bh = read_extent_tree_block(inode, path[ppos].p_block, --i, |
| 859 | flags); |
Theodore Ts'o | 7d7ea89 | 2013-08-16 21:20:41 -0400 | [diff] [blame] | 860 | if (IS_ERR(bh)) { |
| 861 | ret = PTR_ERR(bh); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 862 | goto err; |
Theodore Ts'o | 860d21e | 2013-01-12 16:19:36 -0500 | [diff] [blame] | 863 | } |
Theodore Ts'o | 7d7ea89 | 2013-08-16 21:20:41 -0400 | [diff] [blame] | 864 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 865 | eh = ext_block_hdr(bh); |
| 866 | ppos++; |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 867 | if (unlikely(ppos > depth)) { |
| 868 | put_bh(bh); |
| 869 | EXT4_ERROR_INODE(inode, |
| 870 | "ppos %d > depth %d", ppos, depth); |
Theodore Ts'o | 860d21e | 2013-01-12 16:19:36 -0500 | [diff] [blame] | 871 | ret = -EIO; |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 872 | goto err; |
| 873 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 874 | path[ppos].p_bh = bh; |
| 875 | path[ppos].p_hdr = eh; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 876 | } |
| 877 | |
| 878 | path[ppos].p_depth = i; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 879 | path[ppos].p_ext = NULL; |
| 880 | path[ppos].p_idx = NULL; |
| 881 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 882 | /* find extent */ |
| 883 | ext4_ext_binsearch(inode, path + ppos, block); |
Shen Feng | 1973adc | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 884 | /* if not an empty leaf */ |
| 885 | if (path[ppos].p_ext) |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 886 | path[ppos].p_block = ext4_ext_pblock(path[ppos].p_ext); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 887 | |
| 888 | ext4_ext_show_path(inode, path); |
| 889 | |
| 890 | return path; |
| 891 | |
| 892 | err: |
| 893 | ext4_ext_drop_refs(path); |
| 894 | if (alloc) |
| 895 | kfree(path); |
Theodore Ts'o | 860d21e | 2013-01-12 16:19:36 -0500 | [diff] [blame] | 896 | return ERR_PTR(ret); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 897 | } |
| 898 | |
| 899 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 900 | * ext4_ext_insert_index: |
| 901 | * insert new index [@logical;@ptr] into the block at @curp; |
| 902 | * check where to insert: before @curp or after @curp |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 903 | */ |
Theodore Ts'o | 1f109d5 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 904 | static int ext4_ext_insert_index(handle_t *handle, struct inode *inode, |
| 905 | struct ext4_ext_path *curp, |
| 906 | int logical, ext4_fsblk_t ptr) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 907 | { |
| 908 | struct ext4_extent_idx *ix; |
| 909 | int len, err; |
| 910 | |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 911 | err = ext4_ext_get_access(handle, inode, curp); |
| 912 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 913 | return err; |
| 914 | |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 915 | if (unlikely(logical == le32_to_cpu(curp->p_idx->ei_block))) { |
| 916 | EXT4_ERROR_INODE(inode, |
| 917 | "logical %d == ei_block %d!", |
| 918 | logical, le32_to_cpu(curp->p_idx->ei_block)); |
| 919 | return -EIO; |
| 920 | } |
Robin Dong | d462031 | 2011-07-17 23:43:42 -0400 | [diff] [blame] | 921 | |
| 922 | if (unlikely(le16_to_cpu(curp->p_hdr->eh_entries) |
| 923 | >= le16_to_cpu(curp->p_hdr->eh_max))) { |
| 924 | EXT4_ERROR_INODE(inode, |
| 925 | "eh_entries %d >= eh_max %d!", |
| 926 | le16_to_cpu(curp->p_hdr->eh_entries), |
| 927 | le16_to_cpu(curp->p_hdr->eh_max)); |
| 928 | return -EIO; |
| 929 | } |
| 930 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 931 | if (logical > le32_to_cpu(curp->p_idx->ei_block)) { |
| 932 | /* insert after */ |
Eric Gouriou | 80e675f | 2011-10-27 11:52:18 -0400 | [diff] [blame] | 933 | ext_debug("insert new index %d after: %llu\n", logical, ptr); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 934 | ix = curp->p_idx + 1; |
| 935 | } else { |
| 936 | /* insert before */ |
Eric Gouriou | 80e675f | 2011-10-27 11:52:18 -0400 | [diff] [blame] | 937 | ext_debug("insert new index %d before: %llu\n", logical, ptr); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 938 | ix = curp->p_idx; |
| 939 | } |
| 940 | |
Eric Gouriou | 80e675f | 2011-10-27 11:52:18 -0400 | [diff] [blame] | 941 | len = EXT_LAST_INDEX(curp->p_hdr) - ix + 1; |
| 942 | BUG_ON(len < 0); |
| 943 | if (len > 0) { |
| 944 | ext_debug("insert new index %d: " |
| 945 | "move %d indices from 0x%p to 0x%p\n", |
| 946 | logical, len, ix, ix + 1); |
| 947 | memmove(ix + 1, ix, len * sizeof(struct ext4_extent_idx)); |
| 948 | } |
| 949 | |
Tao Ma | f472e02 | 2011-10-17 10:13:46 -0400 | [diff] [blame] | 950 | if (unlikely(ix > EXT_MAX_INDEX(curp->p_hdr))) { |
| 951 | EXT4_ERROR_INODE(inode, "ix > EXT_MAX_INDEX!"); |
| 952 | return -EIO; |
| 953 | } |
| 954 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 955 | ix->ei_block = cpu_to_le32(logical); |
Alex Tomas | f65e6fb | 2006-10-11 01:21:05 -0700 | [diff] [blame] | 956 | ext4_idx_store_pblock(ix, ptr); |
Marcin Slusarz | e8546d0 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 957 | le16_add_cpu(&curp->p_hdr->eh_entries, 1); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 958 | |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 959 | if (unlikely(ix > EXT_LAST_INDEX(curp->p_hdr))) { |
| 960 | EXT4_ERROR_INODE(inode, "ix > EXT_LAST_INDEX!"); |
| 961 | return -EIO; |
| 962 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 963 | |
| 964 | err = ext4_ext_dirty(handle, inode, curp); |
| 965 | ext4_std_error(inode->i_sb, err); |
| 966 | |
| 967 | return err; |
| 968 | } |
| 969 | |
| 970 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 971 | * ext4_ext_split: |
| 972 | * inserts new subtree into the path, using free index entry |
| 973 | * at depth @at: |
| 974 | * - allocates all needed blocks (new leaf and all intermediate index blocks) |
| 975 | * - makes decision where to split |
| 976 | * - moves remaining extents and index entries (right to the split point) |
| 977 | * into the newly allocated blocks |
| 978 | * - initializes subtree |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 979 | */ |
| 980 | static int ext4_ext_split(handle_t *handle, struct inode *inode, |
Allison Henderson | 55f020d | 2011-05-25 07:41:26 -0400 | [diff] [blame] | 981 | unsigned int flags, |
| 982 | struct ext4_ext_path *path, |
| 983 | struct ext4_extent *newext, int at) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 984 | { |
| 985 | struct buffer_head *bh = NULL; |
| 986 | int depth = ext_depth(inode); |
| 987 | struct ext4_extent_header *neh; |
| 988 | struct ext4_extent_idx *fidx; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 989 | int i = at, k, m, a; |
Alex Tomas | f65e6fb | 2006-10-11 01:21:05 -0700 | [diff] [blame] | 990 | ext4_fsblk_t newblock, oldblock; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 991 | __le32 border; |
Alex Tomas | f65e6fb | 2006-10-11 01:21:05 -0700 | [diff] [blame] | 992 | ext4_fsblk_t *ablocks = NULL; /* array of allocated blocks */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 993 | int err = 0; |
| 994 | |
| 995 | /* make decision: where to split? */ |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 996 | /* FIXME: now decision is simplest: at current extent */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 997 | |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 998 | /* if current leaf will be split, then we should use |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 999 | * border from split point */ |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1000 | if (unlikely(path[depth].p_ext > EXT_MAX_EXTENT(path[depth].p_hdr))) { |
| 1001 | EXT4_ERROR_INODE(inode, "p_ext > EXT_MAX_EXTENT!"); |
| 1002 | return -EIO; |
| 1003 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1004 | if (path[depth].p_ext != EXT_MAX_EXTENT(path[depth].p_hdr)) { |
| 1005 | border = path[depth].p_ext[1].ee_block; |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1006 | ext_debug("leaf will be split." |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1007 | " next leaf starts at %d\n", |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 1008 | le32_to_cpu(border)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1009 | } else { |
| 1010 | border = newext->ee_block; |
| 1011 | ext_debug("leaf will be added." |
| 1012 | " next leaf starts at %d\n", |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 1013 | le32_to_cpu(border)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1014 | } |
| 1015 | |
| 1016 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1017 | * If error occurs, then we break processing |
| 1018 | * and mark filesystem read-only. index won't |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1019 | * be inserted and tree will be in consistent |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1020 | * state. Next mount will repair buffers too. |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1021 | */ |
| 1022 | |
| 1023 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1024 | * Get array to track all allocated blocks. |
| 1025 | * We need this to handle errors and free blocks |
| 1026 | * upon them. |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1027 | */ |
Avantika Mathur | 5d4958f | 2006-12-06 20:41:35 -0800 | [diff] [blame] | 1028 | ablocks = kzalloc(sizeof(ext4_fsblk_t) * depth, GFP_NOFS); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1029 | if (!ablocks) |
| 1030 | return -ENOMEM; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1031 | |
| 1032 | /* allocate all needed blocks */ |
| 1033 | ext_debug("allocate %d blocks for indexes/leaf\n", depth - at); |
| 1034 | for (a = 0; a < depth - at; a++) { |
Aneesh Kumar K.V | 654b490 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 1035 | newblock = ext4_ext_new_meta_block(handle, inode, path, |
Allison Henderson | 55f020d | 2011-05-25 07:41:26 -0400 | [diff] [blame] | 1036 | newext, &err, flags); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1037 | if (newblock == 0) |
| 1038 | goto cleanup; |
| 1039 | ablocks[a] = newblock; |
| 1040 | } |
| 1041 | |
| 1042 | /* initialize new leaf */ |
| 1043 | newblock = ablocks[--a]; |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1044 | if (unlikely(newblock == 0)) { |
| 1045 | EXT4_ERROR_INODE(inode, "newblock == 0!"); |
| 1046 | err = -EIO; |
| 1047 | goto cleanup; |
| 1048 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1049 | bh = sb_getblk(inode->i_sb, newblock); |
Wang Shilong | aebf024 | 2013-01-12 16:28:47 -0500 | [diff] [blame] | 1050 | if (unlikely(!bh)) { |
Theodore Ts'o | 860d21e | 2013-01-12 16:19:36 -0500 | [diff] [blame] | 1051 | err = -ENOMEM; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1052 | goto cleanup; |
| 1053 | } |
| 1054 | lock_buffer(bh); |
| 1055 | |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 1056 | err = ext4_journal_get_create_access(handle, bh); |
| 1057 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1058 | goto cleanup; |
| 1059 | |
| 1060 | neh = ext_block_hdr(bh); |
| 1061 | neh->eh_entries = 0; |
Theodore Ts'o | 55ad63b | 2009-08-28 10:40:33 -0400 | [diff] [blame] | 1062 | neh->eh_max = cpu_to_le16(ext4_ext_space_block(inode, 0)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1063 | neh->eh_magic = EXT4_EXT_MAGIC; |
| 1064 | neh->eh_depth = 0; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1065 | |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1066 | /* move remainder of path[depth] to the new leaf */ |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1067 | if (unlikely(path[depth].p_hdr->eh_entries != |
| 1068 | path[depth].p_hdr->eh_max)) { |
| 1069 | EXT4_ERROR_INODE(inode, "eh_entries %d != eh_max %d!", |
| 1070 | path[depth].p_hdr->eh_entries, |
| 1071 | path[depth].p_hdr->eh_max); |
| 1072 | err = -EIO; |
| 1073 | goto cleanup; |
| 1074 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1075 | /* start copy from next extent */ |
Yongqiang Yang | 1b16da7 | 2011-05-25 17:41:48 -0400 | [diff] [blame] | 1076 | m = EXT_MAX_EXTENT(path[depth].p_hdr) - path[depth].p_ext++; |
| 1077 | ext4_ext_show_move(inode, path, newblock, depth); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1078 | if (m) { |
Yongqiang Yang | 1b16da7 | 2011-05-25 17:41:48 -0400 | [diff] [blame] | 1079 | struct ext4_extent *ex; |
| 1080 | ex = EXT_FIRST_EXTENT(neh); |
| 1081 | memmove(ex, path[depth].p_ext, sizeof(struct ext4_extent) * m); |
Marcin Slusarz | e8546d0 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 1082 | le16_add_cpu(&neh->eh_entries, m); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1083 | } |
| 1084 | |
Darrick J. Wong | 7ac5990 | 2012-04-29 18:37:10 -0400 | [diff] [blame] | 1085 | ext4_extent_block_csum_set(inode, neh); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1086 | set_buffer_uptodate(bh); |
| 1087 | unlock_buffer(bh); |
| 1088 | |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 1089 | err = ext4_handle_dirty_metadata(handle, inode, bh); |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 1090 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1091 | goto cleanup; |
| 1092 | brelse(bh); |
| 1093 | bh = NULL; |
| 1094 | |
| 1095 | /* correct old leaf */ |
| 1096 | if (m) { |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 1097 | err = ext4_ext_get_access(handle, inode, path + depth); |
| 1098 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1099 | goto cleanup; |
Marcin Slusarz | e8546d0 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 1100 | le16_add_cpu(&path[depth].p_hdr->eh_entries, -m); |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 1101 | err = ext4_ext_dirty(handle, inode, path + depth); |
| 1102 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1103 | goto cleanup; |
| 1104 | |
| 1105 | } |
| 1106 | |
| 1107 | /* create intermediate indexes */ |
| 1108 | k = depth - at - 1; |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1109 | if (unlikely(k < 0)) { |
| 1110 | EXT4_ERROR_INODE(inode, "k %d < 0!", k); |
| 1111 | err = -EIO; |
| 1112 | goto cleanup; |
| 1113 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1114 | if (k) |
| 1115 | ext_debug("create %d intermediate indices\n", k); |
| 1116 | /* insert new index into current index block */ |
| 1117 | /* current depth stored in i var */ |
| 1118 | i = depth - 1; |
| 1119 | while (k--) { |
| 1120 | oldblock = newblock; |
| 1121 | newblock = ablocks[--a]; |
Eric Sandeen | bba9074 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1122 | bh = sb_getblk(inode->i_sb, newblock); |
Wang Shilong | aebf024 | 2013-01-12 16:28:47 -0500 | [diff] [blame] | 1123 | if (unlikely(!bh)) { |
Theodore Ts'o | 860d21e | 2013-01-12 16:19:36 -0500 | [diff] [blame] | 1124 | err = -ENOMEM; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1125 | goto cleanup; |
| 1126 | } |
| 1127 | lock_buffer(bh); |
| 1128 | |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 1129 | err = ext4_journal_get_create_access(handle, bh); |
| 1130 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1131 | goto cleanup; |
| 1132 | |
| 1133 | neh = ext_block_hdr(bh); |
| 1134 | neh->eh_entries = cpu_to_le16(1); |
| 1135 | neh->eh_magic = EXT4_EXT_MAGIC; |
Theodore Ts'o | 55ad63b | 2009-08-28 10:40:33 -0400 | [diff] [blame] | 1136 | 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] | 1137 | neh->eh_depth = cpu_to_le16(depth - i); |
| 1138 | fidx = EXT_FIRST_INDEX(neh); |
| 1139 | fidx->ei_block = border; |
Alex Tomas | f65e6fb | 2006-10-11 01:21:05 -0700 | [diff] [blame] | 1140 | ext4_idx_store_pblock(fidx, oldblock); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1141 | |
Eric Sandeen | bba9074 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1142 | ext_debug("int.index at %d (block %llu): %u -> %llu\n", |
| 1143 | i, newblock, le32_to_cpu(border), oldblock); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1144 | |
Yongqiang Yang | 1b16da7 | 2011-05-25 17:41:48 -0400 | [diff] [blame] | 1145 | /* move remainder of path[i] to the new index block */ |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1146 | if (unlikely(EXT_MAX_INDEX(path[i].p_hdr) != |
| 1147 | EXT_LAST_INDEX(path[i].p_hdr))) { |
| 1148 | EXT4_ERROR_INODE(inode, |
| 1149 | "EXT_MAX_INDEX != EXT_LAST_INDEX ee_block %d!", |
| 1150 | le32_to_cpu(path[i].p_ext->ee_block)); |
| 1151 | err = -EIO; |
| 1152 | goto cleanup; |
| 1153 | } |
Yongqiang Yang | 1b16da7 | 2011-05-25 17:41:48 -0400 | [diff] [blame] | 1154 | /* start copy indexes */ |
| 1155 | m = EXT_MAX_INDEX(path[i].p_hdr) - path[i].p_idx++; |
| 1156 | ext_debug("cur 0x%p, last 0x%p\n", path[i].p_idx, |
| 1157 | EXT_MAX_INDEX(path[i].p_hdr)); |
| 1158 | ext4_ext_show_move(inode, path, newblock, i); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1159 | if (m) { |
Yongqiang Yang | 1b16da7 | 2011-05-25 17:41:48 -0400 | [diff] [blame] | 1160 | memmove(++fidx, path[i].p_idx, |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1161 | sizeof(struct ext4_extent_idx) * m); |
Marcin Slusarz | e8546d0 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 1162 | le16_add_cpu(&neh->eh_entries, m); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1163 | } |
Darrick J. Wong | 7ac5990 | 2012-04-29 18:37:10 -0400 | [diff] [blame] | 1164 | ext4_extent_block_csum_set(inode, neh); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1165 | set_buffer_uptodate(bh); |
| 1166 | unlock_buffer(bh); |
| 1167 | |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 1168 | err = ext4_handle_dirty_metadata(handle, inode, bh); |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 1169 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1170 | goto cleanup; |
| 1171 | brelse(bh); |
| 1172 | bh = NULL; |
| 1173 | |
| 1174 | /* correct old index */ |
| 1175 | if (m) { |
| 1176 | err = ext4_ext_get_access(handle, inode, path + i); |
| 1177 | if (err) |
| 1178 | goto cleanup; |
Marcin Slusarz | e8546d0 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 1179 | le16_add_cpu(&path[i].p_hdr->eh_entries, -m); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1180 | err = ext4_ext_dirty(handle, inode, path + i); |
| 1181 | if (err) |
| 1182 | goto cleanup; |
| 1183 | } |
| 1184 | |
| 1185 | i--; |
| 1186 | } |
| 1187 | |
| 1188 | /* insert new index */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1189 | err = ext4_ext_insert_index(handle, inode, path + at, |
| 1190 | le32_to_cpu(border), newblock); |
| 1191 | |
| 1192 | cleanup: |
| 1193 | if (bh) { |
| 1194 | if (buffer_locked(bh)) |
| 1195 | unlock_buffer(bh); |
| 1196 | brelse(bh); |
| 1197 | } |
| 1198 | |
| 1199 | if (err) { |
| 1200 | /* free all allocated blocks in error case */ |
| 1201 | for (i = 0; i < depth; i++) { |
| 1202 | if (!ablocks[i]) |
| 1203 | continue; |
Peter Huewe | 7dc5761 | 2011-02-21 21:01:42 -0500 | [diff] [blame] | 1204 | ext4_free_blocks(handle, inode, NULL, ablocks[i], 1, |
Theodore Ts'o | e636260 | 2009-11-23 07:17:05 -0500 | [diff] [blame] | 1205 | EXT4_FREE_BLOCKS_METADATA); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1206 | } |
| 1207 | } |
| 1208 | kfree(ablocks); |
| 1209 | |
| 1210 | return err; |
| 1211 | } |
| 1212 | |
| 1213 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1214 | * ext4_ext_grow_indepth: |
| 1215 | * implements tree growing procedure: |
| 1216 | * - allocates new block |
| 1217 | * - moves top-level data (index block or leaf) into the new block |
| 1218 | * - initializes new top-level, creating index that points to the |
| 1219 | * just created block |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1220 | */ |
| 1221 | static int ext4_ext_grow_indepth(handle_t *handle, struct inode *inode, |
Allison Henderson | 55f020d | 2011-05-25 07:41:26 -0400 | [diff] [blame] | 1222 | unsigned int flags, |
Allison Henderson | 55f020d | 2011-05-25 07:41:26 -0400 | [diff] [blame] | 1223 | struct ext4_extent *newext) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1224 | { |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1225 | struct ext4_extent_header *neh; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1226 | struct buffer_head *bh; |
Alex Tomas | f65e6fb | 2006-10-11 01:21:05 -0700 | [diff] [blame] | 1227 | ext4_fsblk_t newblock; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1228 | int err = 0; |
| 1229 | |
Dmitry Monakhov | 1939dd8 | 2011-10-22 01:26:05 -0400 | [diff] [blame] | 1230 | newblock = ext4_ext_new_meta_block(handle, inode, NULL, |
Allison Henderson | 55f020d | 2011-05-25 07:41:26 -0400 | [diff] [blame] | 1231 | newext, &err, flags); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1232 | if (newblock == 0) |
| 1233 | return err; |
| 1234 | |
| 1235 | bh = sb_getblk(inode->i_sb, newblock); |
Wang Shilong | aebf024 | 2013-01-12 16:28:47 -0500 | [diff] [blame] | 1236 | if (unlikely(!bh)) |
Theodore Ts'o | 860d21e | 2013-01-12 16:19:36 -0500 | [diff] [blame] | 1237 | return -ENOMEM; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1238 | lock_buffer(bh); |
| 1239 | |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 1240 | err = ext4_journal_get_create_access(handle, bh); |
| 1241 | if (err) { |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1242 | unlock_buffer(bh); |
| 1243 | goto out; |
| 1244 | } |
| 1245 | |
| 1246 | /* move top-level index/leaf into new block */ |
Dmitry Monakhov | 1939dd8 | 2011-10-22 01:26:05 -0400 | [diff] [blame] | 1247 | memmove(bh->b_data, EXT4_I(inode)->i_data, |
| 1248 | sizeof(EXT4_I(inode)->i_data)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1249 | |
| 1250 | /* set size of new block */ |
| 1251 | neh = ext_block_hdr(bh); |
| 1252 | /* old root could have indexes or leaves |
| 1253 | * so calculate e_max right way */ |
| 1254 | if (ext_depth(inode)) |
Theodore Ts'o | 55ad63b | 2009-08-28 10:40:33 -0400 | [diff] [blame] | 1255 | 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] | 1256 | else |
Theodore Ts'o | 55ad63b | 2009-08-28 10:40:33 -0400 | [diff] [blame] | 1257 | neh->eh_max = cpu_to_le16(ext4_ext_space_block(inode, 0)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1258 | neh->eh_magic = EXT4_EXT_MAGIC; |
Darrick J. Wong | 7ac5990 | 2012-04-29 18:37:10 -0400 | [diff] [blame] | 1259 | ext4_extent_block_csum_set(inode, neh); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1260 | set_buffer_uptodate(bh); |
| 1261 | unlock_buffer(bh); |
| 1262 | |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 1263 | err = ext4_handle_dirty_metadata(handle, inode, bh); |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 1264 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1265 | goto out; |
| 1266 | |
Dmitry Monakhov | 1939dd8 | 2011-10-22 01:26:05 -0400 | [diff] [blame] | 1267 | /* Update top-level index: num,max,pointer */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1268 | neh = ext_inode_hdr(inode); |
Dmitry Monakhov | 1939dd8 | 2011-10-22 01:26:05 -0400 | [diff] [blame] | 1269 | neh->eh_entries = cpu_to_le16(1); |
| 1270 | ext4_idx_store_pblock(EXT_FIRST_INDEX(neh), newblock); |
| 1271 | if (neh->eh_depth == 0) { |
| 1272 | /* Root extent block becomes index block */ |
| 1273 | neh->eh_max = cpu_to_le16(ext4_ext_space_root_idx(inode, 0)); |
| 1274 | EXT_FIRST_INDEX(neh)->ei_block = |
| 1275 | EXT_FIRST_EXTENT(neh)->ee_block; |
| 1276 | } |
Mingming Cao | 2ae0210 | 2006-10-11 01:21:11 -0700 | [diff] [blame] | 1277 | ext_debug("new root: num %d(%d), lblock %d, ptr %llu\n", |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1278 | le16_to_cpu(neh->eh_entries), le16_to_cpu(neh->eh_max), |
Andi Kleen | 5a0790c | 2010-06-14 13:28:03 -0400 | [diff] [blame] | 1279 | le32_to_cpu(EXT_FIRST_INDEX(neh)->ei_block), |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 1280 | ext4_idx_pblock(EXT_FIRST_INDEX(neh))); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1281 | |
Wei Yongjun | ba39ebb | 2012-09-27 09:37:53 -0400 | [diff] [blame] | 1282 | le16_add_cpu(&neh->eh_depth, 1); |
Dmitry Monakhov | 1939dd8 | 2011-10-22 01:26:05 -0400 | [diff] [blame] | 1283 | ext4_mark_inode_dirty(handle, inode); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1284 | out: |
| 1285 | brelse(bh); |
| 1286 | |
| 1287 | return err; |
| 1288 | } |
| 1289 | |
| 1290 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1291 | * ext4_ext_create_new_leaf: |
| 1292 | * finds empty index and adds new leaf. |
| 1293 | * if no free index is found, then it requests in-depth growing. |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1294 | */ |
| 1295 | 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] | 1296 | unsigned int mb_flags, |
| 1297 | unsigned int gb_flags, |
Allison Henderson | 55f020d | 2011-05-25 07:41:26 -0400 | [diff] [blame] | 1298 | struct ext4_ext_path *path, |
| 1299 | struct ext4_extent *newext) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1300 | { |
| 1301 | struct ext4_ext_path *curp; |
| 1302 | int depth, i, err = 0; |
| 1303 | |
| 1304 | repeat: |
| 1305 | i = depth = ext_depth(inode); |
| 1306 | |
| 1307 | /* walk up to the tree and look for free index entry */ |
| 1308 | curp = path + depth; |
| 1309 | while (i > 0 && !EXT_HAS_FREE_INDEX(curp)) { |
| 1310 | i--; |
| 1311 | curp--; |
| 1312 | } |
| 1313 | |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1314 | /* we use already allocated block for index block, |
| 1315 | * so subsequent data blocks should be contiguous */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1316 | if (EXT_HAS_FREE_INDEX(curp)) { |
| 1317 | /* if we found index with free entry, then use that |
| 1318 | * entry: create all needed subtree and add new leaf */ |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 1319 | err = ext4_ext_split(handle, inode, mb_flags, path, newext, i); |
Shen Feng | 787e098 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 1320 | if (err) |
| 1321 | goto out; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1322 | |
| 1323 | /* refill path */ |
| 1324 | ext4_ext_drop_refs(path); |
| 1325 | path = ext4_ext_find_extent(inode, |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1326 | (ext4_lblk_t)le32_to_cpu(newext->ee_block), |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 1327 | path, gb_flags); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1328 | if (IS_ERR(path)) |
| 1329 | err = PTR_ERR(path); |
| 1330 | } else { |
| 1331 | /* tree is full, time to grow in depth */ |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 1332 | err = ext4_ext_grow_indepth(handle, inode, mb_flags, newext); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1333 | if (err) |
| 1334 | goto out; |
| 1335 | |
| 1336 | /* refill path */ |
| 1337 | ext4_ext_drop_refs(path); |
| 1338 | path = ext4_ext_find_extent(inode, |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1339 | (ext4_lblk_t)le32_to_cpu(newext->ee_block), |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 1340 | path, gb_flags); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1341 | if (IS_ERR(path)) { |
| 1342 | err = PTR_ERR(path); |
| 1343 | goto out; |
| 1344 | } |
| 1345 | |
| 1346 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1347 | * only first (depth 0 -> 1) produces free space; |
| 1348 | * in all other cases we have to split the grown tree |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1349 | */ |
| 1350 | depth = ext_depth(inode); |
| 1351 | 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] | 1352 | /* now we need to split */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1353 | goto repeat; |
| 1354 | } |
| 1355 | } |
| 1356 | |
| 1357 | out: |
| 1358 | return err; |
| 1359 | } |
| 1360 | |
| 1361 | /* |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1362 | * search the closest allocated block to the left for *logical |
| 1363 | * and returns it at @logical + it's physical address at @phys |
| 1364 | * if *logical is the smallest allocated block, the function |
| 1365 | * returns 0 at @phys |
| 1366 | * return value contains 0 (success) or error code |
| 1367 | */ |
Theodore Ts'o | 1f109d5 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 1368 | static int ext4_ext_search_left(struct inode *inode, |
| 1369 | struct ext4_ext_path *path, |
| 1370 | ext4_lblk_t *logical, ext4_fsblk_t *phys) |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1371 | { |
| 1372 | struct ext4_extent_idx *ix; |
| 1373 | struct ext4_extent *ex; |
Aneesh Kumar K.V | b939e37 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1374 | int depth, ee_len; |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1375 | |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1376 | if (unlikely(path == NULL)) { |
| 1377 | EXT4_ERROR_INODE(inode, "path == NULL *logical %d!", *logical); |
| 1378 | return -EIO; |
| 1379 | } |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1380 | depth = path->p_depth; |
| 1381 | *phys = 0; |
| 1382 | |
| 1383 | if (depth == 0 && path->p_ext == NULL) |
| 1384 | return 0; |
| 1385 | |
| 1386 | /* usually extent in the path covers blocks smaller |
| 1387 | * then *logical, but it can be that extent is the |
| 1388 | * first one in the file */ |
| 1389 | |
| 1390 | ex = path[depth].p_ext; |
Aneesh Kumar K.V | b939e37 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1391 | ee_len = ext4_ext_get_actual_len(ex); |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1392 | if (*logical < le32_to_cpu(ex->ee_block)) { |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1393 | if (unlikely(EXT_FIRST_EXTENT(path[depth].p_hdr) != ex)) { |
| 1394 | EXT4_ERROR_INODE(inode, |
| 1395 | "EXT_FIRST_EXTENT != ex *logical %d ee_block %d!", |
| 1396 | *logical, le32_to_cpu(ex->ee_block)); |
| 1397 | return -EIO; |
| 1398 | } |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1399 | while (--depth >= 0) { |
| 1400 | ix = path[depth].p_idx; |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1401 | if (unlikely(ix != EXT_FIRST_INDEX(path[depth].p_hdr))) { |
| 1402 | EXT4_ERROR_INODE(inode, |
| 1403 | "ix (%d) != EXT_FIRST_INDEX (%d) (depth %d)!", |
Tao Ma | 6ee3b21 | 2011-10-08 16:08:34 -0400 | [diff] [blame] | 1404 | ix != NULL ? le32_to_cpu(ix->ei_block) : 0, |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1405 | EXT_FIRST_INDEX(path[depth].p_hdr) != NULL ? |
Tao Ma | 6ee3b21 | 2011-10-08 16:08:34 -0400 | [diff] [blame] | 1406 | 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] | 1407 | depth); |
| 1408 | return -EIO; |
| 1409 | } |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1410 | } |
| 1411 | return 0; |
| 1412 | } |
| 1413 | |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1414 | if (unlikely(*logical < (le32_to_cpu(ex->ee_block) + ee_len))) { |
| 1415 | EXT4_ERROR_INODE(inode, |
| 1416 | "logical %d < ee_block %d + ee_len %d!", |
| 1417 | *logical, le32_to_cpu(ex->ee_block), ee_len); |
| 1418 | return -EIO; |
| 1419 | } |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1420 | |
Aneesh Kumar K.V | b939e37 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1421 | *logical = le32_to_cpu(ex->ee_block) + ee_len - 1; |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 1422 | *phys = ext4_ext_pblock(ex) + ee_len - 1; |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1423 | return 0; |
| 1424 | } |
| 1425 | |
| 1426 | /* |
| 1427 | * search the closest allocated block to the right for *logical |
| 1428 | * and returns it at @logical + it's physical address at @phys |
Tao Ma | df3ab17 | 2011-10-08 15:53:49 -0400 | [diff] [blame] | 1429 | * if *logical is the largest allocated block, the function |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1430 | * returns 0 at @phys |
| 1431 | * return value contains 0 (success) or error code |
| 1432 | */ |
Theodore Ts'o | 1f109d5 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 1433 | static int ext4_ext_search_right(struct inode *inode, |
| 1434 | struct ext4_ext_path *path, |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 1435 | ext4_lblk_t *logical, ext4_fsblk_t *phys, |
| 1436 | struct ext4_extent **ret_ex) |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1437 | { |
| 1438 | struct buffer_head *bh = NULL; |
| 1439 | struct ext4_extent_header *eh; |
| 1440 | struct ext4_extent_idx *ix; |
| 1441 | struct ext4_extent *ex; |
| 1442 | ext4_fsblk_t block; |
Eric Sandeen | 395a87b | 2009-03-10 18:18:47 -0400 | [diff] [blame] | 1443 | int depth; /* Note, NOT eh_depth; depth from top of tree */ |
| 1444 | int ee_len; |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1445 | |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1446 | if (unlikely(path == NULL)) { |
| 1447 | EXT4_ERROR_INODE(inode, "path == NULL *logical %d!", *logical); |
| 1448 | return -EIO; |
| 1449 | } |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1450 | depth = path->p_depth; |
| 1451 | *phys = 0; |
| 1452 | |
| 1453 | if (depth == 0 && path->p_ext == NULL) |
| 1454 | return 0; |
| 1455 | |
| 1456 | /* usually extent in the path covers blocks smaller |
| 1457 | * then *logical, but it can be that extent is the |
| 1458 | * first one in the file */ |
| 1459 | |
| 1460 | ex = path[depth].p_ext; |
Aneesh Kumar K.V | b939e37 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1461 | ee_len = ext4_ext_get_actual_len(ex); |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1462 | if (*logical < le32_to_cpu(ex->ee_block)) { |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1463 | if (unlikely(EXT_FIRST_EXTENT(path[depth].p_hdr) != ex)) { |
| 1464 | EXT4_ERROR_INODE(inode, |
| 1465 | "first_extent(path[%d].p_hdr) != ex", |
| 1466 | depth); |
| 1467 | return -EIO; |
| 1468 | } |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1469 | while (--depth >= 0) { |
| 1470 | ix = path[depth].p_idx; |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1471 | if (unlikely(ix != EXT_FIRST_INDEX(path[depth].p_hdr))) { |
| 1472 | EXT4_ERROR_INODE(inode, |
| 1473 | "ix != EXT_FIRST_INDEX *logical %d!", |
| 1474 | *logical); |
| 1475 | return -EIO; |
| 1476 | } |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1477 | } |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 1478 | goto found_extent; |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1479 | } |
| 1480 | |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1481 | if (unlikely(*logical < (le32_to_cpu(ex->ee_block) + ee_len))) { |
| 1482 | EXT4_ERROR_INODE(inode, |
| 1483 | "logical %d < ee_block %d + ee_len %d!", |
| 1484 | *logical, le32_to_cpu(ex->ee_block), ee_len); |
| 1485 | return -EIO; |
| 1486 | } |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1487 | |
| 1488 | if (ex != EXT_LAST_EXTENT(path[depth].p_hdr)) { |
| 1489 | /* next allocated block in this leaf */ |
| 1490 | ex++; |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 1491 | goto found_extent; |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1492 | } |
| 1493 | |
| 1494 | /* go up and search for index to the right */ |
| 1495 | while (--depth >= 0) { |
| 1496 | ix = path[depth].p_idx; |
| 1497 | if (ix != EXT_LAST_INDEX(path[depth].p_hdr)) |
Wu Fengguang | 25f1ee3 | 2008-11-25 17:24:23 -0500 | [diff] [blame] | 1498 | goto got_index; |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1499 | } |
| 1500 | |
Wu Fengguang | 25f1ee3 | 2008-11-25 17:24:23 -0500 | [diff] [blame] | 1501 | /* we've gone up to the root and found no index to the right */ |
| 1502 | return 0; |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1503 | |
Wu Fengguang | 25f1ee3 | 2008-11-25 17:24:23 -0500 | [diff] [blame] | 1504 | got_index: |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1505 | /* we've found index to the right, let's |
| 1506 | * follow it and find the closest allocated |
| 1507 | * block to the right */ |
| 1508 | ix++; |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 1509 | block = ext4_idx_pblock(ix); |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1510 | while (++depth < path->p_depth) { |
Eric Sandeen | 395a87b | 2009-03-10 18:18:47 -0400 | [diff] [blame] | 1511 | /* subtract from p_depth to get proper eh_depth */ |
Theodore Ts'o | 7d7ea89 | 2013-08-16 21:20:41 -0400 | [diff] [blame] | 1512 | bh = read_extent_tree_block(inode, block, |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 1513 | path->p_depth - depth, 0); |
Theodore Ts'o | 7d7ea89 | 2013-08-16 21:20:41 -0400 | [diff] [blame] | 1514 | if (IS_ERR(bh)) |
| 1515 | return PTR_ERR(bh); |
| 1516 | eh = ext_block_hdr(bh); |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1517 | ix = EXT_FIRST_INDEX(eh); |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 1518 | block = ext4_idx_pblock(ix); |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1519 | put_bh(bh); |
| 1520 | } |
| 1521 | |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 1522 | 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] | 1523 | if (IS_ERR(bh)) |
| 1524 | return PTR_ERR(bh); |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1525 | eh = ext_block_hdr(bh); |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1526 | ex = EXT_FIRST_EXTENT(eh); |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 1527 | found_extent: |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1528 | *logical = le32_to_cpu(ex->ee_block); |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 1529 | *phys = ext4_ext_pblock(ex); |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 1530 | *ret_ex = ex; |
| 1531 | if (bh) |
| 1532 | put_bh(bh); |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1533 | return 0; |
Alex Tomas | 1988b51 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1534 | } |
| 1535 | |
| 1536 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1537 | * ext4_ext_next_allocated_block: |
Lukas Czerner | f17722f | 2011-06-06 00:05:17 -0400 | [diff] [blame] | 1538 | * returns allocated block in subsequent extent or EXT_MAX_BLOCKS. |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1539 | * NOTE: it considers block number from index entry as |
| 1540 | * allocated block. Thus, index entries have to be consistent |
| 1541 | * with leaves. |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1542 | */ |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1543 | static ext4_lblk_t |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1544 | ext4_ext_next_allocated_block(struct ext4_ext_path *path) |
| 1545 | { |
| 1546 | int depth; |
| 1547 | |
| 1548 | BUG_ON(path == NULL); |
| 1549 | depth = path->p_depth; |
| 1550 | |
| 1551 | if (depth == 0 && path->p_ext == NULL) |
Lukas Czerner | f17722f | 2011-06-06 00:05:17 -0400 | [diff] [blame] | 1552 | return EXT_MAX_BLOCKS; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1553 | |
| 1554 | while (depth >= 0) { |
| 1555 | if (depth == path->p_depth) { |
| 1556 | /* leaf */ |
Curt Wohlgemuth | 6f8ff53 | 2011-10-26 04:38:59 -0400 | [diff] [blame] | 1557 | if (path[depth].p_ext && |
| 1558 | path[depth].p_ext != |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1559 | EXT_LAST_EXTENT(path[depth].p_hdr)) |
| 1560 | return le32_to_cpu(path[depth].p_ext[1].ee_block); |
| 1561 | } else { |
| 1562 | /* index */ |
| 1563 | if (path[depth].p_idx != |
| 1564 | EXT_LAST_INDEX(path[depth].p_hdr)) |
| 1565 | return le32_to_cpu(path[depth].p_idx[1].ei_block); |
| 1566 | } |
| 1567 | depth--; |
| 1568 | } |
| 1569 | |
Lukas Czerner | f17722f | 2011-06-06 00:05:17 -0400 | [diff] [blame] | 1570 | return EXT_MAX_BLOCKS; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1571 | } |
| 1572 | |
| 1573 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1574 | * ext4_ext_next_leaf_block: |
Lukas Czerner | f17722f | 2011-06-06 00:05:17 -0400 | [diff] [blame] | 1575 | * returns first allocated block from next leaf or EXT_MAX_BLOCKS |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1576 | */ |
Robin Dong | 5718789 | 2011-07-23 21:49:07 -0400 | [diff] [blame] | 1577 | 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] | 1578 | { |
| 1579 | int depth; |
| 1580 | |
| 1581 | BUG_ON(path == NULL); |
| 1582 | depth = path->p_depth; |
| 1583 | |
| 1584 | /* zero-tree has no leaf blocks at all */ |
| 1585 | if (depth == 0) |
Lukas Czerner | f17722f | 2011-06-06 00:05:17 -0400 | [diff] [blame] | 1586 | return EXT_MAX_BLOCKS; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1587 | |
| 1588 | /* go to index block */ |
| 1589 | depth--; |
| 1590 | |
| 1591 | while (depth >= 0) { |
| 1592 | if (path[depth].p_idx != |
| 1593 | EXT_LAST_INDEX(path[depth].p_hdr)) |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1594 | return (ext4_lblk_t) |
| 1595 | le32_to_cpu(path[depth].p_idx[1].ei_block); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1596 | depth--; |
| 1597 | } |
| 1598 | |
Lukas Czerner | f17722f | 2011-06-06 00:05:17 -0400 | [diff] [blame] | 1599 | return EXT_MAX_BLOCKS; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1600 | } |
| 1601 | |
| 1602 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1603 | * ext4_ext_correct_indexes: |
| 1604 | * if leaf gets modified and modified extent is first in the leaf, |
| 1605 | * then we have to correct all indexes above. |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1606 | * TODO: do we need to correct tree in all cases? |
| 1607 | */ |
Aneesh Kumar K.V | 1d03ec9 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1608 | static int ext4_ext_correct_indexes(handle_t *handle, struct inode *inode, |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1609 | struct ext4_ext_path *path) |
| 1610 | { |
| 1611 | struct ext4_extent_header *eh; |
| 1612 | int depth = ext_depth(inode); |
| 1613 | struct ext4_extent *ex; |
| 1614 | __le32 border; |
| 1615 | int k, err = 0; |
| 1616 | |
| 1617 | eh = path[depth].p_hdr; |
| 1618 | ex = path[depth].p_ext; |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1619 | |
| 1620 | if (unlikely(ex == NULL || eh == NULL)) { |
| 1621 | EXT4_ERROR_INODE(inode, |
| 1622 | "ex %p == NULL or eh %p == NULL", ex, eh); |
| 1623 | return -EIO; |
| 1624 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1625 | |
| 1626 | if (depth == 0) { |
| 1627 | /* there is no tree at all */ |
| 1628 | return 0; |
| 1629 | } |
| 1630 | |
| 1631 | if (ex != EXT_FIRST_EXTENT(eh)) { |
| 1632 | /* we correct tree if first leaf got modified only */ |
| 1633 | return 0; |
| 1634 | } |
| 1635 | |
| 1636 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1637 | * TODO: we need correction if border is smaller than current one |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1638 | */ |
| 1639 | k = depth - 1; |
| 1640 | border = path[depth].p_ext->ee_block; |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 1641 | err = ext4_ext_get_access(handle, inode, path + k); |
| 1642 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1643 | return err; |
| 1644 | path[k].p_idx->ei_block = border; |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 1645 | err = ext4_ext_dirty(handle, inode, path + k); |
| 1646 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1647 | return err; |
| 1648 | |
| 1649 | while (k--) { |
| 1650 | /* change all left-side indexes */ |
| 1651 | if (path[k+1].p_idx != EXT_FIRST_INDEX(path[k+1].p_hdr)) |
| 1652 | break; |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 1653 | err = ext4_ext_get_access(handle, inode, path + k); |
| 1654 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1655 | break; |
| 1656 | path[k].p_idx->ei_block = border; |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 1657 | err = ext4_ext_dirty(handle, inode, path + k); |
| 1658 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1659 | break; |
| 1660 | } |
| 1661 | |
| 1662 | return err; |
| 1663 | } |
| 1664 | |
Akira Fujita | 748de67 | 2009-06-17 19:24:03 -0400 | [diff] [blame] | 1665 | int |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1666 | ext4_can_extents_be_merged(struct inode *inode, struct ext4_extent *ex1, |
| 1667 | struct ext4_extent *ex2) |
| 1668 | { |
Amit Arora | 749269f | 2007-07-18 09:02:56 -0400 | [diff] [blame] | 1669 | unsigned short ext1_ee_len, ext2_ee_len, max_len; |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 1670 | |
| 1671 | /* |
Dmitry Monakhov | ec22ba8 | 2013-03-04 00:36:06 -0500 | [diff] [blame] | 1672 | * Make sure that both extents are initialized. We don't merge |
| 1673 | * uninitialized extents so that we can be sure that end_io code has |
| 1674 | * the extent that was written properly split out and conversion to |
| 1675 | * initialized is trivial. |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 1676 | */ |
Dmitry Monakhov | ec22ba8 | 2013-03-04 00:36:06 -0500 | [diff] [blame] | 1677 | if (ext4_ext_is_uninitialized(ex1) || ext4_ext_is_uninitialized(ex2)) |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 1678 | return 0; |
| 1679 | |
Amit Arora | 749269f | 2007-07-18 09:02:56 -0400 | [diff] [blame] | 1680 | if (ext4_ext_is_uninitialized(ex1)) |
| 1681 | max_len = EXT_UNINIT_MAX_LEN; |
| 1682 | else |
| 1683 | max_len = EXT_INIT_MAX_LEN; |
| 1684 | |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 1685 | ext1_ee_len = ext4_ext_get_actual_len(ex1); |
| 1686 | ext2_ee_len = ext4_ext_get_actual_len(ex2); |
| 1687 | |
| 1688 | if (le32_to_cpu(ex1->ee_block) + ext1_ee_len != |
Andrew Morton | 63f5793 | 2006-10-11 01:21:24 -0700 | [diff] [blame] | 1689 | le32_to_cpu(ex2->ee_block)) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1690 | return 0; |
| 1691 | |
Suparna Bhattacharya | 471d401 | 2006-10-11 01:21:06 -0700 | [diff] [blame] | 1692 | /* |
| 1693 | * To allow future support for preallocated extents to be added |
| 1694 | * as an RO_COMPAT feature, refuse to merge to extents if |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1695 | * this can result in the top bit of ee_len being set. |
Suparna Bhattacharya | 471d401 | 2006-10-11 01:21:06 -0700 | [diff] [blame] | 1696 | */ |
Amit Arora | 749269f | 2007-07-18 09:02:56 -0400 | [diff] [blame] | 1697 | if (ext1_ee_len + ext2_ee_len > max_len) |
Suparna Bhattacharya | 471d401 | 2006-10-11 01:21:06 -0700 | [diff] [blame] | 1698 | return 0; |
Robert P. J. Day | bbf2f9f | 2007-02-17 19:20:16 +0100 | [diff] [blame] | 1699 | #ifdef AGGRESSIVE_TEST |
Aneesh Kumar K.V | b939e37 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1700 | if (ext1_ee_len >= 4) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1701 | return 0; |
| 1702 | #endif |
| 1703 | |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 1704 | if (ext4_ext_pblock(ex1) + ext1_ee_len == ext4_ext_pblock(ex2)) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1705 | return 1; |
| 1706 | return 0; |
| 1707 | } |
| 1708 | |
| 1709 | /* |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 1710 | * This function tries to merge the "ex" extent to the next extent in the tree. |
| 1711 | * It always tries to merge towards right. If you want to merge towards |
| 1712 | * left, pass "ex - 1" as argument instead of "ex". |
| 1713 | * Returns 0 if the extents (ex and ex+1) were _not_ merged and returns |
| 1714 | * 1 if they got merged. |
| 1715 | */ |
Yongqiang Yang | 197217a | 2011-05-03 11:45:29 -0400 | [diff] [blame] | 1716 | static int ext4_ext_try_to_merge_right(struct inode *inode, |
Theodore Ts'o | 1f109d5 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 1717 | struct ext4_ext_path *path, |
| 1718 | struct ext4_extent *ex) |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 1719 | { |
| 1720 | struct ext4_extent_header *eh; |
| 1721 | unsigned int depth, len; |
| 1722 | int merge_done = 0; |
| 1723 | int uninitialized = 0; |
| 1724 | |
| 1725 | depth = ext_depth(inode); |
| 1726 | BUG_ON(path[depth].p_hdr == NULL); |
| 1727 | eh = path[depth].p_hdr; |
| 1728 | |
| 1729 | while (ex < EXT_LAST_EXTENT(eh)) { |
| 1730 | if (!ext4_can_extents_be_merged(inode, ex, ex + 1)) |
| 1731 | break; |
| 1732 | /* merge with next extent! */ |
| 1733 | if (ext4_ext_is_uninitialized(ex)) |
| 1734 | uninitialized = 1; |
| 1735 | ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex) |
| 1736 | + ext4_ext_get_actual_len(ex + 1)); |
| 1737 | if (uninitialized) |
| 1738 | ext4_ext_mark_uninitialized(ex); |
| 1739 | |
| 1740 | if (ex + 1 < EXT_LAST_EXTENT(eh)) { |
| 1741 | len = (EXT_LAST_EXTENT(eh) - ex - 1) |
| 1742 | * sizeof(struct ext4_extent); |
| 1743 | memmove(ex + 1, ex + 2, len); |
| 1744 | } |
Marcin Slusarz | e8546d0 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 1745 | le16_add_cpu(&eh->eh_entries, -1); |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 1746 | merge_done = 1; |
| 1747 | WARN_ON(eh->eh_entries == 0); |
| 1748 | if (!eh->eh_entries) |
Theodore Ts'o | 24676da | 2010-05-16 21:00:00 -0400 | [diff] [blame] | 1749 | EXT4_ERROR_INODE(inode, "eh->eh_entries = 0!"); |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 1750 | } |
| 1751 | |
| 1752 | return merge_done; |
| 1753 | } |
| 1754 | |
| 1755 | /* |
Theodore Ts'o | ecb94f5 | 2012-08-17 09:44:17 -0400 | [diff] [blame] | 1756 | * This function does a very simple check to see if we can collapse |
| 1757 | * an extent tree with a single extent tree leaf block into the inode. |
| 1758 | */ |
| 1759 | static void ext4_ext_try_to_merge_up(handle_t *handle, |
| 1760 | struct inode *inode, |
| 1761 | struct ext4_ext_path *path) |
| 1762 | { |
| 1763 | size_t s; |
| 1764 | unsigned max_root = ext4_ext_space_root(inode, 0); |
| 1765 | ext4_fsblk_t blk; |
| 1766 | |
| 1767 | if ((path[0].p_depth != 1) || |
| 1768 | (le16_to_cpu(path[0].p_hdr->eh_entries) != 1) || |
| 1769 | (le16_to_cpu(path[1].p_hdr->eh_entries) > max_root)) |
| 1770 | return; |
| 1771 | |
| 1772 | /* |
| 1773 | * We need to modify the block allocation bitmap and the block |
| 1774 | * group descriptor to release the extent tree block. If we |
| 1775 | * can't get the journal credits, give up. |
| 1776 | */ |
| 1777 | if (ext4_journal_extend(handle, 2)) |
| 1778 | return; |
| 1779 | |
| 1780 | /* |
| 1781 | * Copy the extent data up to the inode |
| 1782 | */ |
| 1783 | blk = ext4_idx_pblock(path[0].p_idx); |
| 1784 | s = le16_to_cpu(path[1].p_hdr->eh_entries) * |
| 1785 | sizeof(struct ext4_extent_idx); |
| 1786 | s += sizeof(struct ext4_extent_header); |
| 1787 | |
| 1788 | memcpy(path[0].p_hdr, path[1].p_hdr, s); |
| 1789 | path[0].p_depth = 0; |
| 1790 | path[0].p_ext = EXT_FIRST_EXTENT(path[0].p_hdr) + |
| 1791 | (path[1].p_ext - EXT_FIRST_EXTENT(path[1].p_hdr)); |
| 1792 | path[0].p_hdr->eh_max = cpu_to_le16(max_root); |
| 1793 | |
| 1794 | brelse(path[1].p_bh); |
| 1795 | ext4_free_blocks(handle, inode, NULL, blk, 1, |
Jan Kara | 7d73453 | 2013-08-17 09:36:54 -0400 | [diff] [blame] | 1796 | EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET | |
| 1797 | EXT4_FREE_BLOCKS_RESERVE); |
Theodore Ts'o | ecb94f5 | 2012-08-17 09:44:17 -0400 | [diff] [blame] | 1798 | } |
| 1799 | |
| 1800 | /* |
Yongqiang Yang | 197217a | 2011-05-03 11:45:29 -0400 | [diff] [blame] | 1801 | * This function tries to merge the @ex extent to neighbours in the tree. |
| 1802 | * return 1 if merge left else 0. |
| 1803 | */ |
Theodore Ts'o | ecb94f5 | 2012-08-17 09:44:17 -0400 | [diff] [blame] | 1804 | static void ext4_ext_try_to_merge(handle_t *handle, |
| 1805 | struct inode *inode, |
Yongqiang Yang | 197217a | 2011-05-03 11:45:29 -0400 | [diff] [blame] | 1806 | struct ext4_ext_path *path, |
| 1807 | struct ext4_extent *ex) { |
| 1808 | struct ext4_extent_header *eh; |
| 1809 | unsigned int depth; |
| 1810 | int merge_done = 0; |
Yongqiang Yang | 197217a | 2011-05-03 11:45:29 -0400 | [diff] [blame] | 1811 | |
| 1812 | depth = ext_depth(inode); |
| 1813 | BUG_ON(path[depth].p_hdr == NULL); |
| 1814 | eh = path[depth].p_hdr; |
| 1815 | |
| 1816 | if (ex > EXT_FIRST_EXTENT(eh)) |
| 1817 | merge_done = ext4_ext_try_to_merge_right(inode, path, ex - 1); |
| 1818 | |
| 1819 | if (!merge_done) |
Theodore Ts'o | ecb94f5 | 2012-08-17 09:44:17 -0400 | [diff] [blame] | 1820 | (void) ext4_ext_try_to_merge_right(inode, path, ex); |
Yongqiang Yang | 197217a | 2011-05-03 11:45:29 -0400 | [diff] [blame] | 1821 | |
Theodore Ts'o | ecb94f5 | 2012-08-17 09:44:17 -0400 | [diff] [blame] | 1822 | ext4_ext_try_to_merge_up(handle, inode, path); |
Yongqiang Yang | 197217a | 2011-05-03 11:45:29 -0400 | [diff] [blame] | 1823 | } |
| 1824 | |
| 1825 | /* |
Amit Arora | 25d14f9 | 2007-05-24 13:04:13 -0400 | [diff] [blame] | 1826 | * check if a portion of the "newext" extent overlaps with an |
| 1827 | * existing extent. |
| 1828 | * |
| 1829 | * If there is an overlap discovered, it updates the length of the newext |
| 1830 | * such that there will be no overlap, and then returns 1. |
| 1831 | * If there is no overlap found, it returns 0. |
| 1832 | */ |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 1833 | static unsigned int ext4_ext_check_overlap(struct ext4_sb_info *sbi, |
| 1834 | struct inode *inode, |
Theodore Ts'o | 1f109d5 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 1835 | struct ext4_extent *newext, |
| 1836 | struct ext4_ext_path *path) |
Amit Arora | 25d14f9 | 2007-05-24 13:04:13 -0400 | [diff] [blame] | 1837 | { |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1838 | ext4_lblk_t b1, b2; |
Amit Arora | 25d14f9 | 2007-05-24 13:04:13 -0400 | [diff] [blame] | 1839 | unsigned int depth, len1; |
| 1840 | unsigned int ret = 0; |
| 1841 | |
| 1842 | b1 = le32_to_cpu(newext->ee_block); |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 1843 | len1 = ext4_ext_get_actual_len(newext); |
Amit Arora | 25d14f9 | 2007-05-24 13:04:13 -0400 | [diff] [blame] | 1844 | depth = ext_depth(inode); |
| 1845 | if (!path[depth].p_ext) |
| 1846 | goto out; |
| 1847 | b2 = le32_to_cpu(path[depth].p_ext->ee_block); |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 1848 | b2 &= ~(sbi->s_cluster_ratio - 1); |
Amit Arora | 25d14f9 | 2007-05-24 13:04:13 -0400 | [diff] [blame] | 1849 | |
| 1850 | /* |
| 1851 | * get the next allocated block if the extent in the path |
Theodore Ts'o | 2b2d6d0 | 2008-07-26 16:15:44 -0400 | [diff] [blame] | 1852 | * is before the requested block(s) |
Amit Arora | 25d14f9 | 2007-05-24 13:04:13 -0400 | [diff] [blame] | 1853 | */ |
| 1854 | if (b2 < b1) { |
| 1855 | b2 = ext4_ext_next_allocated_block(path); |
Lukas Czerner | f17722f | 2011-06-06 00:05:17 -0400 | [diff] [blame] | 1856 | if (b2 == EXT_MAX_BLOCKS) |
Amit Arora | 25d14f9 | 2007-05-24 13:04:13 -0400 | [diff] [blame] | 1857 | goto out; |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 1858 | b2 &= ~(sbi->s_cluster_ratio - 1); |
Amit Arora | 25d14f9 | 2007-05-24 13:04:13 -0400 | [diff] [blame] | 1859 | } |
| 1860 | |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1861 | /* check for wrap through zero on extent logical start block*/ |
Amit Arora | 25d14f9 | 2007-05-24 13:04:13 -0400 | [diff] [blame] | 1862 | if (b1 + len1 < b1) { |
Lukas Czerner | f17722f | 2011-06-06 00:05:17 -0400 | [diff] [blame] | 1863 | len1 = EXT_MAX_BLOCKS - b1; |
Amit Arora | 25d14f9 | 2007-05-24 13:04:13 -0400 | [diff] [blame] | 1864 | newext->ee_len = cpu_to_le16(len1); |
| 1865 | ret = 1; |
| 1866 | } |
| 1867 | |
| 1868 | /* check for overlap */ |
| 1869 | if (b1 + len1 > b2) { |
| 1870 | newext->ee_len = cpu_to_le16(b2 - b1); |
| 1871 | ret = 1; |
| 1872 | } |
| 1873 | out: |
| 1874 | return ret; |
| 1875 | } |
| 1876 | |
| 1877 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 1878 | * ext4_ext_insert_extent: |
| 1879 | * tries to merge requsted extent into the existing extent or |
| 1880 | * inserts requested extent as new one into the tree, |
| 1881 | * creating new leaf in the no-space case. |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1882 | */ |
| 1883 | int ext4_ext_insert_extent(handle_t *handle, struct inode *inode, |
| 1884 | struct ext4_ext_path *path, |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 1885 | struct ext4_extent *newext, int gb_flags) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1886 | { |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1887 | struct ext4_extent_header *eh; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1888 | struct ext4_extent *ex, *fex; |
| 1889 | struct ext4_extent *nearex; /* nearest extent */ |
| 1890 | struct ext4_ext_path *npath = NULL; |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1891 | int depth, len, err; |
| 1892 | ext4_lblk_t next; |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 1893 | unsigned uninitialized = 0; |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 1894 | int mb_flags = 0; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1895 | |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1896 | if (unlikely(ext4_ext_get_actual_len(newext) == 0)) { |
| 1897 | EXT4_ERROR_INODE(inode, "ext4_ext_get_actual_len(newext) == 0"); |
| 1898 | return -EIO; |
| 1899 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1900 | depth = ext_depth(inode); |
| 1901 | ex = path[depth].p_ext; |
Lukas Czerner | be8981b | 2013-04-03 23:33:28 -0400 | [diff] [blame] | 1902 | eh = path[depth].p_hdr; |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 1903 | if (unlikely(path[depth].p_hdr == NULL)) { |
| 1904 | EXT4_ERROR_INODE(inode, "path[%d].p_hdr == NULL", depth); |
| 1905 | return -EIO; |
| 1906 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1907 | |
| 1908 | /* try to insert block into found extent and return */ |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 1909 | if (ex && !(gb_flags & EXT4_GET_BLOCKS_PRE_IO)) { |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 1910 | |
| 1911 | /* |
Lukas Czerner | be8981b | 2013-04-03 23:33:28 -0400 | [diff] [blame] | 1912 | * Try to see whether we should rather test the extent on |
| 1913 | * right from ex, or from the left of ex. This is because |
| 1914 | * ext4_ext_find_extent() can return either extent on the |
| 1915 | * left, or on the right from the searched position. This |
| 1916 | * will make merging more effective. |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 1917 | */ |
Lukas Czerner | be8981b | 2013-04-03 23:33:28 -0400 | [diff] [blame] | 1918 | if (ex < EXT_LAST_EXTENT(eh) && |
| 1919 | (le32_to_cpu(ex->ee_block) + |
| 1920 | ext4_ext_get_actual_len(ex) < |
| 1921 | le32_to_cpu(newext->ee_block))) { |
| 1922 | ex += 1; |
| 1923 | goto prepend; |
| 1924 | } else if ((ex > EXT_FIRST_EXTENT(eh)) && |
| 1925 | (le32_to_cpu(newext->ee_block) + |
| 1926 | ext4_ext_get_actual_len(newext) < |
| 1927 | le32_to_cpu(ex->ee_block))) |
| 1928 | ex -= 1; |
| 1929 | |
| 1930 | /* Try to append newex to the ex */ |
| 1931 | if (ext4_can_extents_be_merged(inode, ex, newext)) { |
| 1932 | ext_debug("append [%d]%d block to %u:[%d]%d" |
| 1933 | "(from %llu)\n", |
| 1934 | ext4_ext_is_uninitialized(newext), |
| 1935 | ext4_ext_get_actual_len(newext), |
| 1936 | le32_to_cpu(ex->ee_block), |
| 1937 | ext4_ext_is_uninitialized(ex), |
| 1938 | ext4_ext_get_actual_len(ex), |
| 1939 | ext4_ext_pblock(ex)); |
| 1940 | err = ext4_ext_get_access(handle, inode, |
| 1941 | path + depth); |
| 1942 | if (err) |
| 1943 | return err; |
| 1944 | |
| 1945 | /* |
| 1946 | * ext4_can_extents_be_merged should have checked |
| 1947 | * that either both extents are uninitialized, or |
| 1948 | * both aren't. Thus we need to check only one of |
| 1949 | * them here. |
| 1950 | */ |
| 1951 | if (ext4_ext_is_uninitialized(ex)) |
| 1952 | uninitialized = 1; |
| 1953 | ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex) |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 1954 | + ext4_ext_get_actual_len(newext)); |
Lukas Czerner | be8981b | 2013-04-03 23:33:28 -0400 | [diff] [blame] | 1955 | if (uninitialized) |
| 1956 | ext4_ext_mark_uninitialized(ex); |
| 1957 | eh = path[depth].p_hdr; |
| 1958 | nearex = ex; |
| 1959 | goto merge; |
| 1960 | } |
| 1961 | |
| 1962 | prepend: |
| 1963 | /* Try to prepend newex to the ex */ |
| 1964 | if (ext4_can_extents_be_merged(inode, newext, ex)) { |
| 1965 | ext_debug("prepend %u[%d]%d block to %u:[%d]%d" |
| 1966 | "(from %llu)\n", |
| 1967 | le32_to_cpu(newext->ee_block), |
| 1968 | ext4_ext_is_uninitialized(newext), |
| 1969 | ext4_ext_get_actual_len(newext), |
| 1970 | le32_to_cpu(ex->ee_block), |
| 1971 | ext4_ext_is_uninitialized(ex), |
| 1972 | ext4_ext_get_actual_len(ex), |
| 1973 | ext4_ext_pblock(ex)); |
| 1974 | err = ext4_ext_get_access(handle, inode, |
| 1975 | path + depth); |
| 1976 | if (err) |
| 1977 | return err; |
| 1978 | |
| 1979 | /* |
| 1980 | * ext4_can_extents_be_merged should have checked |
| 1981 | * that either both extents are uninitialized, or |
| 1982 | * both aren't. Thus we need to check only one of |
| 1983 | * them here. |
| 1984 | */ |
| 1985 | if (ext4_ext_is_uninitialized(ex)) |
| 1986 | uninitialized = 1; |
| 1987 | ex->ee_block = newext->ee_block; |
| 1988 | ext4_ext_store_pblock(ex, ext4_ext_pblock(newext)); |
| 1989 | ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex) |
| 1990 | + ext4_ext_get_actual_len(newext)); |
| 1991 | if (uninitialized) |
| 1992 | ext4_ext_mark_uninitialized(ex); |
| 1993 | eh = path[depth].p_hdr; |
| 1994 | nearex = ex; |
| 1995 | goto merge; |
| 1996 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1997 | } |
| 1998 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 1999 | depth = ext_depth(inode); |
| 2000 | eh = path[depth].p_hdr; |
| 2001 | if (le16_to_cpu(eh->eh_entries) < le16_to_cpu(eh->eh_max)) |
| 2002 | goto has_space; |
| 2003 | |
| 2004 | /* probably next leaf has space for us? */ |
| 2005 | fex = EXT_LAST_EXTENT(eh); |
Robin Dong | 598dbdf | 2011-07-11 18:24:01 -0400 | [diff] [blame] | 2006 | next = EXT_MAX_BLOCKS; |
| 2007 | 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] | 2008 | next = ext4_ext_next_leaf_block(path); |
Robin Dong | 598dbdf | 2011-07-11 18:24:01 -0400 | [diff] [blame] | 2009 | if (next != EXT_MAX_BLOCKS) { |
Yongqiang Yang | 32de675 | 2011-11-01 18:56:41 -0400 | [diff] [blame] | 2010 | ext_debug("next leaf block - %u\n", next); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2011 | BUG_ON(npath != NULL); |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 2012 | npath = ext4_ext_find_extent(inode, next, NULL, 0); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2013 | if (IS_ERR(npath)) |
| 2014 | return PTR_ERR(npath); |
| 2015 | BUG_ON(npath->p_depth != path->p_depth); |
| 2016 | eh = npath[depth].p_hdr; |
| 2017 | 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] | 2018 | ext_debug("next leaf isn't full(%d)\n", |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2019 | le16_to_cpu(eh->eh_entries)); |
| 2020 | path = npath; |
Robin Dong | ffb505f | 2011-07-11 11:43:59 -0400 | [diff] [blame] | 2021 | goto has_space; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2022 | } |
| 2023 | ext_debug("next leaf has no free space(%d,%d)\n", |
| 2024 | le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max)); |
| 2025 | } |
| 2026 | |
| 2027 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 2028 | * There is no free space in the found leaf. |
| 2029 | * We're gonna add a new leaf in the tree. |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2030 | */ |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 2031 | if (gb_flags & EXT4_GET_BLOCKS_METADATA_NOFAIL) |
| 2032 | mb_flags = EXT4_MB_USE_RESERVED; |
| 2033 | err = ext4_ext_create_new_leaf(handle, inode, mb_flags, gb_flags, |
| 2034 | path, newext); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2035 | if (err) |
| 2036 | goto cleanup; |
| 2037 | depth = ext_depth(inode); |
| 2038 | eh = path[depth].p_hdr; |
| 2039 | |
| 2040 | has_space: |
| 2041 | nearex = path[depth].p_ext; |
| 2042 | |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 2043 | err = ext4_ext_get_access(handle, inode, path + depth); |
| 2044 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2045 | goto cleanup; |
| 2046 | |
| 2047 | if (!nearex) { |
| 2048 | /* there is no extent in this leaf, create first one */ |
Yongqiang Yang | 32de675 | 2011-11-01 18:56:41 -0400 | [diff] [blame] | 2049 | ext_debug("first extent in the leaf: %u:%llu:[%d]%d\n", |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 2050 | le32_to_cpu(newext->ee_block), |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 2051 | ext4_ext_pblock(newext), |
Mingming | 553f900 | 2009-09-18 13:34:55 -0400 | [diff] [blame] | 2052 | ext4_ext_is_uninitialized(newext), |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 2053 | ext4_ext_get_actual_len(newext)); |
Eric Gouriou | 80e675f | 2011-10-27 11:52:18 -0400 | [diff] [blame] | 2054 | nearex = EXT_FIRST_EXTENT(eh); |
| 2055 | } else { |
| 2056 | if (le32_to_cpu(newext->ee_block) |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 2057 | > le32_to_cpu(nearex->ee_block)) { |
Eric Gouriou | 80e675f | 2011-10-27 11:52:18 -0400 | [diff] [blame] | 2058 | /* Insert after */ |
Yongqiang Yang | 32de675 | 2011-11-01 18:56:41 -0400 | [diff] [blame] | 2059 | ext_debug("insert %u:%llu:[%d]%d before: " |
| 2060 | "nearest %p\n", |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 2061 | le32_to_cpu(newext->ee_block), |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 2062 | ext4_ext_pblock(newext), |
Mingming | 553f900 | 2009-09-18 13:34:55 -0400 | [diff] [blame] | 2063 | ext4_ext_is_uninitialized(newext), |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 2064 | ext4_ext_get_actual_len(newext), |
Eric Gouriou | 80e675f | 2011-10-27 11:52:18 -0400 | [diff] [blame] | 2065 | nearex); |
| 2066 | nearex++; |
| 2067 | } else { |
| 2068 | /* Insert before */ |
| 2069 | BUG_ON(newext->ee_block == nearex->ee_block); |
Yongqiang Yang | 32de675 | 2011-11-01 18:56:41 -0400 | [diff] [blame] | 2070 | ext_debug("insert %u:%llu:[%d]%d after: " |
| 2071 | "nearest %p\n", |
Eric Gouriou | 80e675f | 2011-10-27 11:52:18 -0400 | [diff] [blame] | 2072 | le32_to_cpu(newext->ee_block), |
| 2073 | ext4_ext_pblock(newext), |
| 2074 | ext4_ext_is_uninitialized(newext), |
| 2075 | ext4_ext_get_actual_len(newext), |
| 2076 | nearex); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2077 | } |
Eric Gouriou | 80e675f | 2011-10-27 11:52:18 -0400 | [diff] [blame] | 2078 | len = EXT_LAST_EXTENT(eh) - nearex + 1; |
| 2079 | if (len > 0) { |
Yongqiang Yang | 32de675 | 2011-11-01 18:56:41 -0400 | [diff] [blame] | 2080 | ext_debug("insert %u:%llu:[%d]%d: " |
Eric Gouriou | 80e675f | 2011-10-27 11:52:18 -0400 | [diff] [blame] | 2081 | "move %d extents from 0x%p to 0x%p\n", |
| 2082 | le32_to_cpu(newext->ee_block), |
| 2083 | ext4_ext_pblock(newext), |
| 2084 | ext4_ext_is_uninitialized(newext), |
| 2085 | ext4_ext_get_actual_len(newext), |
| 2086 | len, nearex, nearex + 1); |
| 2087 | memmove(nearex + 1, nearex, |
| 2088 | len * sizeof(struct ext4_extent)); |
| 2089 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2090 | } |
| 2091 | |
Marcin Slusarz | e8546d0 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 2092 | le16_add_cpu(&eh->eh_entries, 1); |
Eric Gouriou | 80e675f | 2011-10-27 11:52:18 -0400 | [diff] [blame] | 2093 | path[depth].p_ext = nearex; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2094 | nearex->ee_block = newext->ee_block; |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 2095 | ext4_ext_store_pblock(nearex, ext4_ext_pblock(newext)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2096 | nearex->ee_len = newext->ee_len; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2097 | |
| 2098 | merge: |
HaiboLiu | e7bcf82 | 2012-07-09 16:29:28 -0400 | [diff] [blame] | 2099 | /* try to merge extents */ |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 2100 | if (!(gb_flags & EXT4_GET_BLOCKS_PRE_IO)) |
Theodore Ts'o | ecb94f5 | 2012-08-17 09:44:17 -0400 | [diff] [blame] | 2101 | ext4_ext_try_to_merge(handle, inode, path, nearex); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2102 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2103 | |
| 2104 | /* time to correct all indexes above */ |
| 2105 | err = ext4_ext_correct_indexes(handle, inode, path); |
| 2106 | if (err) |
| 2107 | goto cleanup; |
| 2108 | |
Theodore Ts'o | ecb94f5 | 2012-08-17 09:44:17 -0400 | [diff] [blame] | 2109 | err = ext4_ext_dirty(handle, inode, path + path->p_depth); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2110 | |
| 2111 | cleanup: |
| 2112 | if (npath) { |
| 2113 | ext4_ext_drop_refs(npath); |
| 2114 | kfree(npath); |
| 2115 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2116 | return err; |
| 2117 | } |
| 2118 | |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2119 | static int ext4_fill_fiemap_extents(struct inode *inode, |
| 2120 | ext4_lblk_t block, ext4_lblk_t num, |
| 2121 | struct fiemap_extent_info *fieinfo) |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2122 | { |
| 2123 | struct ext4_ext_path *path = NULL; |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2124 | struct ext4_extent *ex; |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 2125 | struct extent_status es; |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2126 | ext4_lblk_t next, next_del, start = 0, end = 0; |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2127 | ext4_lblk_t last = block + num; |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2128 | int exists, depth = 0, err = 0; |
| 2129 | unsigned int flags = 0; |
| 2130 | unsigned char blksize_bits = inode->i_sb->s_blocksize_bits; |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2131 | |
Lukas Czerner | f17722f | 2011-06-06 00:05:17 -0400 | [diff] [blame] | 2132 | while (block < last && block != EXT_MAX_BLOCKS) { |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2133 | num = last - block; |
| 2134 | /* find extent for this block */ |
Theodore Ts'o | fab3a54 | 2009-12-09 21:30:02 -0500 | [diff] [blame] | 2135 | down_read(&EXT4_I(inode)->i_data_sem); |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2136 | |
| 2137 | if (path && ext_depth(inode) != depth) { |
| 2138 | /* depth was changed. we have to realloc path */ |
| 2139 | kfree(path); |
| 2140 | path = NULL; |
| 2141 | } |
| 2142 | |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 2143 | path = ext4_ext_find_extent(inode, block, path, 0); |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2144 | if (IS_ERR(path)) { |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2145 | up_read(&EXT4_I(inode)->i_data_sem); |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2146 | err = PTR_ERR(path); |
| 2147 | path = NULL; |
| 2148 | break; |
| 2149 | } |
| 2150 | |
| 2151 | depth = ext_depth(inode); |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 2152 | if (unlikely(path[depth].p_hdr == NULL)) { |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2153 | up_read(&EXT4_I(inode)->i_data_sem); |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 2154 | EXT4_ERROR_INODE(inode, "path[%d].p_hdr == NULL", depth); |
| 2155 | err = -EIO; |
| 2156 | break; |
| 2157 | } |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2158 | ex = path[depth].p_ext; |
| 2159 | next = ext4_ext_next_allocated_block(path); |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2160 | ext4_ext_drop_refs(path); |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2161 | |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2162 | flags = 0; |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2163 | exists = 0; |
| 2164 | if (!ex) { |
| 2165 | /* there is no extent yet, so try to allocate |
| 2166 | * all requested space */ |
| 2167 | start = block; |
| 2168 | end = block + num; |
| 2169 | } else if (le32_to_cpu(ex->ee_block) > block) { |
| 2170 | /* need to allocate space before found extent */ |
| 2171 | start = block; |
| 2172 | end = le32_to_cpu(ex->ee_block); |
| 2173 | if (block + num < end) |
| 2174 | end = block + num; |
| 2175 | } else if (block >= le32_to_cpu(ex->ee_block) |
| 2176 | + ext4_ext_get_actual_len(ex)) { |
| 2177 | /* need to allocate space after found extent */ |
| 2178 | start = block; |
| 2179 | end = block + num; |
| 2180 | if (end >= next) |
| 2181 | end = next; |
| 2182 | } else if (block >= le32_to_cpu(ex->ee_block)) { |
| 2183 | /* |
| 2184 | * some part of requested space is covered |
| 2185 | * by found extent |
| 2186 | */ |
| 2187 | start = block; |
| 2188 | end = le32_to_cpu(ex->ee_block) |
| 2189 | + ext4_ext_get_actual_len(ex); |
| 2190 | if (block + num < end) |
| 2191 | end = block + num; |
| 2192 | exists = 1; |
| 2193 | } else { |
| 2194 | BUG(); |
| 2195 | } |
| 2196 | BUG_ON(end <= start); |
| 2197 | |
| 2198 | if (!exists) { |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 2199 | es.es_lblk = start; |
| 2200 | es.es_len = end - start; |
| 2201 | es.es_pblk = 0; |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2202 | } else { |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 2203 | es.es_lblk = le32_to_cpu(ex->ee_block); |
| 2204 | es.es_len = ext4_ext_get_actual_len(ex); |
| 2205 | es.es_pblk = ext4_ext_pblock(ex); |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2206 | if (ext4_ext_is_uninitialized(ex)) |
| 2207 | flags |= FIEMAP_EXTENT_UNWRITTEN; |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2208 | } |
| 2209 | |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2210 | /* |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 2211 | * Find delayed extent and update es accordingly. We call |
| 2212 | * it even in !exists case to find out whether es is the |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2213 | * last existing extent or not. |
| 2214 | */ |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 2215 | next_del = ext4_find_delayed_extent(inode, &es); |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2216 | if (!exists && next_del) { |
| 2217 | exists = 1; |
Jie Liu | 72dac95 | 2013-06-12 23:13:59 -0400 | [diff] [blame] | 2218 | flags |= (FIEMAP_EXTENT_DELALLOC | |
| 2219 | FIEMAP_EXTENT_UNKNOWN); |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2220 | } |
| 2221 | up_read(&EXT4_I(inode)->i_data_sem); |
| 2222 | |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 2223 | if (unlikely(es.es_len == 0)) { |
| 2224 | EXT4_ERROR_INODE(inode, "es.es_len == 0"); |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 2225 | err = -EIO; |
| 2226 | break; |
| 2227 | } |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2228 | |
Zheng Liu | f7fec03 | 2013-02-18 00:28:47 -0500 | [diff] [blame] | 2229 | /* |
| 2230 | * This is possible iff next == next_del == EXT_MAX_BLOCKS. |
| 2231 | * we need to check next == EXT_MAX_BLOCKS because it is |
| 2232 | * possible that an extent is with unwritten and delayed |
| 2233 | * status due to when an extent is delayed allocated and |
| 2234 | * is allocated by fallocate status tree will track both of |
| 2235 | * them in a extent. |
| 2236 | * |
| 2237 | * So we could return a unwritten and delayed extent, and |
| 2238 | * its block is equal to 'next'. |
| 2239 | */ |
| 2240 | if (next == next_del && next == EXT_MAX_BLOCKS) { |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2241 | flags |= FIEMAP_EXTENT_LAST; |
| 2242 | if (unlikely(next_del != EXT_MAX_BLOCKS || |
| 2243 | next != EXT_MAX_BLOCKS)) { |
| 2244 | EXT4_ERROR_INODE(inode, |
| 2245 | "next extent == %u, next " |
| 2246 | "delalloc extent = %u", |
| 2247 | next, next_del); |
| 2248 | err = -EIO; |
| 2249 | break; |
| 2250 | } |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2251 | } |
| 2252 | |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2253 | if (exists) { |
| 2254 | err = fiemap_fill_next_extent(fieinfo, |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 2255 | (__u64)es.es_lblk << blksize_bits, |
| 2256 | (__u64)es.es_pblk << blksize_bits, |
| 2257 | (__u64)es.es_len << blksize_bits, |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 2258 | flags); |
| 2259 | if (err < 0) |
| 2260 | break; |
| 2261 | if (err == 1) { |
| 2262 | err = 0; |
| 2263 | break; |
| 2264 | } |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2265 | } |
| 2266 | |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 2267 | block = es.es_lblk + es.es_len; |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 2268 | } |
| 2269 | |
| 2270 | if (path) { |
| 2271 | ext4_ext_drop_refs(path); |
| 2272 | kfree(path); |
| 2273 | } |
| 2274 | |
| 2275 | return err; |
| 2276 | } |
| 2277 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2278 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 2279 | * ext4_ext_put_gap_in_cache: |
| 2280 | * calculate boundaries of the gap that the requested block fits into |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2281 | * and cache this gap |
| 2282 | */ |
Avantika Mathur | 09b8825 | 2006-12-06 20:41:36 -0800 | [diff] [blame] | 2283 | static void |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2284 | 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] | 2285 | ext4_lblk_t block) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2286 | { |
| 2287 | int depth = ext_depth(inode); |
Andi Shyti | 27b1b22 | 2013-08-28 14:00:00 -0400 | [diff] [blame] | 2288 | unsigned long len = 0; |
| 2289 | ext4_lblk_t lblock = 0; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2290 | struct ext4_extent *ex; |
| 2291 | |
| 2292 | ex = path[depth].p_ext; |
| 2293 | if (ex == NULL) { |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 2294 | /* |
| 2295 | * there is no extent yet, so gap is [0;-] and we |
| 2296 | * don't cache it |
| 2297 | */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2298 | ext_debug("cache gap(whole file):"); |
| 2299 | } else if (block < le32_to_cpu(ex->ee_block)) { |
| 2300 | lblock = block; |
| 2301 | len = le32_to_cpu(ex->ee_block) - block; |
Eric Sandeen | bba9074 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2302 | ext_debug("cache gap(before): %u [%u:%u]", |
| 2303 | block, |
| 2304 | le32_to_cpu(ex->ee_block), |
| 2305 | ext4_ext_get_actual_len(ex)); |
Zheng Liu | d100eef | 2013-02-18 00:29:59 -0500 | [diff] [blame] | 2306 | if (!ext4_find_delalloc_range(inode, lblock, lblock + len - 1)) |
| 2307 | ext4_es_insert_extent(inode, lblock, len, ~0, |
| 2308 | EXTENT_STATUS_HOLE); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2309 | } else if (block >= le32_to_cpu(ex->ee_block) |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 2310 | + ext4_ext_get_actual_len(ex)) { |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2311 | ext4_lblk_t next; |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 2312 | lblock = le32_to_cpu(ex->ee_block) |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 2313 | + ext4_ext_get_actual_len(ex); |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2314 | |
| 2315 | next = ext4_ext_next_allocated_block(path); |
Eric Sandeen | bba9074 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2316 | ext_debug("cache gap(after): [%u:%u] %u", |
| 2317 | le32_to_cpu(ex->ee_block), |
| 2318 | ext4_ext_get_actual_len(ex), |
| 2319 | block); |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2320 | BUG_ON(next == lblock); |
| 2321 | len = next - lblock; |
Zheng Liu | d100eef | 2013-02-18 00:29:59 -0500 | [diff] [blame] | 2322 | if (!ext4_find_delalloc_range(inode, lblock, lblock + len - 1)) |
| 2323 | ext4_es_insert_extent(inode, lblock, len, ~0, |
| 2324 | EXTENT_STATUS_HOLE); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2325 | } else { |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2326 | BUG(); |
| 2327 | } |
| 2328 | |
Eric Sandeen | bba9074 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2329 | ext_debug(" -> %u:%lu\n", lblock, len); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2330 | } |
| 2331 | |
| 2332 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 2333 | * ext4_ext_rm_idx: |
| 2334 | * removes index from the index block. |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2335 | */ |
Aneesh Kumar K.V | 1d03ec9 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2336 | static int ext4_ext_rm_idx(handle_t *handle, struct inode *inode, |
Forrest Liu | c36575e | 2012-12-17 09:55:39 -0500 | [diff] [blame] | 2337 | struct ext4_ext_path *path, int depth) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2338 | { |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2339 | int err; |
Alex Tomas | f65e6fb | 2006-10-11 01:21:05 -0700 | [diff] [blame] | 2340 | ext4_fsblk_t leaf; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2341 | |
| 2342 | /* free index block */ |
Forrest Liu | c36575e | 2012-12-17 09:55:39 -0500 | [diff] [blame] | 2343 | depth--; |
| 2344 | path = path + depth; |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 2345 | leaf = ext4_idx_pblock(path->p_idx); |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 2346 | if (unlikely(path->p_hdr->eh_entries == 0)) { |
| 2347 | EXT4_ERROR_INODE(inode, "path->p_hdr->eh_entries == 0"); |
| 2348 | return -EIO; |
| 2349 | } |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 2350 | err = ext4_ext_get_access(handle, inode, path); |
| 2351 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2352 | return err; |
Robin Dong | 0e1147b | 2011-07-27 21:29:33 -0400 | [diff] [blame] | 2353 | |
| 2354 | if (path->p_idx != EXT_LAST_INDEX(path->p_hdr)) { |
| 2355 | int len = EXT_LAST_INDEX(path->p_hdr) - path->p_idx; |
| 2356 | len *= sizeof(struct ext4_extent_idx); |
| 2357 | memmove(path->p_idx, path->p_idx + 1, len); |
| 2358 | } |
| 2359 | |
Marcin Slusarz | e8546d0 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 2360 | le16_add_cpu(&path->p_hdr->eh_entries, -1); |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 2361 | err = ext4_ext_dirty(handle, inode, path); |
| 2362 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2363 | return err; |
Mingming Cao | 2ae0210 | 2006-10-11 01:21:11 -0700 | [diff] [blame] | 2364 | ext_debug("index is empty, remove it, free block %llu\n", leaf); |
Aditya Kali | d899024 | 2011-09-09 19:18:51 -0400 | [diff] [blame] | 2365 | trace_ext4_ext_rm_idx(inode, leaf); |
| 2366 | |
Peter Huewe | 7dc5761 | 2011-02-21 21:01:42 -0500 | [diff] [blame] | 2367 | ext4_free_blocks(handle, inode, NULL, leaf, 1, |
Theodore Ts'o | e636260 | 2009-11-23 07:17:05 -0500 | [diff] [blame] | 2368 | EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET); |
Forrest Liu | c36575e | 2012-12-17 09:55:39 -0500 | [diff] [blame] | 2369 | |
| 2370 | while (--depth >= 0) { |
| 2371 | if (path->p_idx != EXT_FIRST_INDEX(path->p_hdr)) |
| 2372 | break; |
| 2373 | path--; |
| 2374 | err = ext4_ext_get_access(handle, inode, path); |
| 2375 | if (err) |
| 2376 | break; |
| 2377 | path->p_idx->ei_block = (path+1)->p_idx->ei_block; |
| 2378 | err = ext4_ext_dirty(handle, inode, path); |
| 2379 | if (err) |
| 2380 | break; |
| 2381 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2382 | return err; |
| 2383 | } |
| 2384 | |
| 2385 | /* |
Mingming Cao | ee12b63 | 2008-08-19 22:16:05 -0400 | [diff] [blame] | 2386 | * ext4_ext_calc_credits_for_single_extent: |
| 2387 | * This routine returns max. credits that needed to insert an extent |
| 2388 | * to the extent tree. |
| 2389 | * When pass the actual path, the caller should calculate credits |
| 2390 | * under i_data_sem. |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2391 | */ |
Mingming Cao | 525f4ed | 2008-08-19 22:15:58 -0400 | [diff] [blame] | 2392 | 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] | 2393 | struct ext4_ext_path *path) |
| 2394 | { |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2395 | if (path) { |
Mingming Cao | ee12b63 | 2008-08-19 22:16:05 -0400 | [diff] [blame] | 2396 | int depth = ext_depth(inode); |
Mingming Cao | f3bd1f3 | 2008-08-19 22:16:03 -0400 | [diff] [blame] | 2397 | int ret = 0; |
Mingming Cao | ee12b63 | 2008-08-19 22:16:05 -0400 | [diff] [blame] | 2398 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2399 | /* probably there is space in leaf? */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2400 | if (le16_to_cpu(path[depth].p_hdr->eh_entries) |
Mingming Cao | ee12b63 | 2008-08-19 22:16:05 -0400 | [diff] [blame] | 2401 | < le16_to_cpu(path[depth].p_hdr->eh_max)) { |
| 2402 | |
| 2403 | /* |
| 2404 | * There are some space in the leaf tree, no |
| 2405 | * need to account for leaf block credit |
| 2406 | * |
| 2407 | * bitmaps and block group descriptor blocks |
Tao Ma | df3ab17 | 2011-10-08 15:53:49 -0400 | [diff] [blame] | 2408 | * and other metadata blocks still need to be |
Mingming Cao | ee12b63 | 2008-08-19 22:16:05 -0400 | [diff] [blame] | 2409 | * accounted. |
| 2410 | */ |
Mingming Cao | 525f4ed | 2008-08-19 22:15:58 -0400 | [diff] [blame] | 2411 | /* 1 bitmap, 1 block group descriptor */ |
Mingming Cao | ee12b63 | 2008-08-19 22:16:05 -0400 | [diff] [blame] | 2412 | ret = 2 + EXT4_META_TRANS_BLOCKS(inode->i_sb); |
Aneesh Kumar K.V | 5887e98 | 2009-07-05 23:12:04 -0400 | [diff] [blame] | 2413 | return ret; |
Mingming Cao | ee12b63 | 2008-08-19 22:16:05 -0400 | [diff] [blame] | 2414 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2415 | } |
| 2416 | |
Mingming Cao | 525f4ed | 2008-08-19 22:15:58 -0400 | [diff] [blame] | 2417 | return ext4_chunk_trans_blocks(inode, nrblocks); |
Mingming Cao | ee12b63 | 2008-08-19 22:16:05 -0400 | [diff] [blame] | 2418 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2419 | |
Mingming Cao | ee12b63 | 2008-08-19 22:16:05 -0400 | [diff] [blame] | 2420 | /* |
Jan Kara | fffb273 | 2013-06-04 13:01:11 -0400 | [diff] [blame] | 2421 | * 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] | 2422 | * |
Jan Kara | fffb273 | 2013-06-04 13:01:11 -0400 | [diff] [blame] | 2423 | * If we add a single extent, then in the worse case, each tree level |
| 2424 | * index/leaf need to be changed in case of the tree split. |
Mingming Cao | ee12b63 | 2008-08-19 22:16:05 -0400 | [diff] [blame] | 2425 | * |
Jan Kara | fffb273 | 2013-06-04 13:01:11 -0400 | [diff] [blame] | 2426 | * If more extents are inserted, they could cause the whole tree split more |
| 2427 | * than once, but this is really rare. |
Mingming Cao | ee12b63 | 2008-08-19 22:16:05 -0400 | [diff] [blame] | 2428 | */ |
Jan Kara | fffb273 | 2013-06-04 13:01:11 -0400 | [diff] [blame] | 2429 | int ext4_ext_index_trans_blocks(struct inode *inode, int extents) |
Mingming Cao | ee12b63 | 2008-08-19 22:16:05 -0400 | [diff] [blame] | 2430 | { |
| 2431 | int index; |
Tao Ma | f19d587 | 2012-12-10 14:05:51 -0500 | [diff] [blame] | 2432 | int depth; |
| 2433 | |
| 2434 | /* If we are converting the inline data, only one is needed here. */ |
| 2435 | if (ext4_has_inline_data(inode)) |
| 2436 | return 1; |
| 2437 | |
| 2438 | depth = ext_depth(inode); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2439 | |
Jan Kara | fffb273 | 2013-06-04 13:01:11 -0400 | [diff] [blame] | 2440 | if (extents <= 1) |
Mingming Cao | ee12b63 | 2008-08-19 22:16:05 -0400 | [diff] [blame] | 2441 | index = depth * 2; |
| 2442 | else |
| 2443 | index = depth * 3; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2444 | |
Mingming Cao | ee12b63 | 2008-08-19 22:16:05 -0400 | [diff] [blame] | 2445 | return index; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2446 | } |
| 2447 | |
Theodore Ts'o | 981250c | 2013-06-12 11:48:29 -0400 | [diff] [blame] | 2448 | static inline int get_default_free_blocks_flags(struct inode *inode) |
| 2449 | { |
| 2450 | if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) |
| 2451 | return EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET; |
| 2452 | else if (ext4_should_journal_data(inode)) |
| 2453 | return EXT4_FREE_BLOCKS_FORGET; |
| 2454 | return 0; |
| 2455 | } |
| 2456 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2457 | static int ext4_remove_blocks(handle_t *handle, struct inode *inode, |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2458 | struct ext4_extent *ex, |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2459 | long long *partial_cluster, |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2460 | ext4_lblk_t from, ext4_lblk_t to) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2461 | { |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2462 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 2463 | unsigned short ee_len = ext4_ext_get_actual_len(ex); |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2464 | ext4_fsblk_t pblk; |
Theodore Ts'o | 981250c | 2013-06-12 11:48:29 -0400 | [diff] [blame] | 2465 | int flags = get_default_free_blocks_flags(inode); |
Andrey Sidorov | 18888cf | 2012-09-19 14:14:53 -0400 | [diff] [blame] | 2466 | |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2467 | /* |
| 2468 | * For bigalloc file systems, we never free a partial cluster |
| 2469 | * at the beginning of the extent. Instead, we make a note |
| 2470 | * that we tried freeing the cluster, and check to see if we |
| 2471 | * need to free it on a subsequent call to ext4_remove_blocks, |
| 2472 | * or at the end of the ext4_truncate() operation. |
| 2473 | */ |
| 2474 | flags |= EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER; |
| 2475 | |
Aditya Kali | d899024 | 2011-09-09 19:18:51 -0400 | [diff] [blame] | 2476 | trace_ext4_remove_blocks(inode, ex, from, to, *partial_cluster); |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2477 | /* |
| 2478 | * If we have a partial cluster, and it's different from the |
| 2479 | * cluster of the last block, we need to explicitly free the |
| 2480 | * partial cluster here. |
| 2481 | */ |
| 2482 | pblk = ext4_ext_pblock(ex) + ee_len - 1; |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2483 | if ((*partial_cluster > 0) && |
| 2484 | (EXT4_B2C(sbi, pblk) != *partial_cluster)) { |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2485 | ext4_free_blocks(handle, inode, NULL, |
| 2486 | EXT4_C2B(sbi, *partial_cluster), |
| 2487 | sbi->s_cluster_ratio, flags); |
| 2488 | *partial_cluster = 0; |
| 2489 | } |
| 2490 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2491 | #ifdef EXTENTS_STATS |
| 2492 | { |
| 2493 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2494 | spin_lock(&sbi->s_ext_stats_lock); |
| 2495 | sbi->s_ext_blocks += ee_len; |
| 2496 | sbi->s_ext_extents++; |
| 2497 | if (ee_len < sbi->s_ext_min) |
| 2498 | sbi->s_ext_min = ee_len; |
| 2499 | if (ee_len > sbi->s_ext_max) |
| 2500 | sbi->s_ext_max = ee_len; |
| 2501 | if (ext_depth(inode) > sbi->s_depth_max) |
| 2502 | sbi->s_depth_max = ext_depth(inode); |
| 2503 | spin_unlock(&sbi->s_ext_stats_lock); |
| 2504 | } |
| 2505 | #endif |
| 2506 | if (from >= le32_to_cpu(ex->ee_block) |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 2507 | && to == le32_to_cpu(ex->ee_block) + ee_len - 1) { |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2508 | /* tail removal */ |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2509 | ext4_lblk_t num; |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2510 | unsigned int unaligned; |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2511 | |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 2512 | num = le32_to_cpu(ex->ee_block) + ee_len - from; |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2513 | pblk = ext4_ext_pblock(ex) + ee_len - num; |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2514 | /* |
| 2515 | * Usually we want to free partial cluster at the end of the |
| 2516 | * extent, except for the situation when the cluster is still |
| 2517 | * used by any other extent (partial_cluster is negative). |
| 2518 | */ |
| 2519 | if (*partial_cluster < 0 && |
| 2520 | -(*partial_cluster) == EXT4_B2C(sbi, pblk + num - 1)) |
| 2521 | flags |= EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER; |
| 2522 | |
| 2523 | ext_debug("free last %u blocks starting %llu partial %lld\n", |
| 2524 | num, pblk, *partial_cluster); |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2525 | ext4_free_blocks(handle, inode, NULL, pblk, num, flags); |
| 2526 | /* |
| 2527 | * If the block range to be freed didn't start at the |
| 2528 | * beginning of a cluster, and we removed the entire |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2529 | * extent and the cluster is not used by any other extent, |
| 2530 | * save the partial cluster here, since we might need to |
| 2531 | * delete if we determine that the truncate operation has |
| 2532 | * removed all of the blocks in the cluster. |
| 2533 | * |
| 2534 | * On the other hand, if we did not manage to free the whole |
| 2535 | * extent, we have to mark the cluster as used (store negative |
| 2536 | * cluster number in partial_cluster). |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2537 | */ |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2538 | unaligned = pblk & (sbi->s_cluster_ratio - 1); |
| 2539 | if (unaligned && (ee_len == num) && |
| 2540 | (*partial_cluster != -((long long)EXT4_B2C(sbi, pblk)))) |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2541 | *partial_cluster = EXT4_B2C(sbi, pblk); |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2542 | else if (unaligned) |
| 2543 | *partial_cluster = -((long long)EXT4_B2C(sbi, pblk)); |
| 2544 | else if (*partial_cluster > 0) |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2545 | *partial_cluster = 0; |
Lukas Czerner | 78fb9cd | 2013-05-27 23:32:35 -0400 | [diff] [blame] | 2546 | } else |
| 2547 | ext4_error(sbi->s_sb, "strange request: removal(2) " |
| 2548 | "%u-%u from %u:%u\n", |
| 2549 | from, to, le32_to_cpu(ex->ee_block), ee_len); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2550 | return 0; |
| 2551 | } |
| 2552 | |
Allison Henderson | d583fb8 | 2011-05-25 07:41:43 -0400 | [diff] [blame] | 2553 | |
| 2554 | /* |
| 2555 | * ext4_ext_rm_leaf() Removes the extents associated with the |
| 2556 | * blocks appearing between "start" and "end", and splits the extents |
| 2557 | * if "start" and "end" appear in the same extent |
| 2558 | * |
| 2559 | * @handle: The journal handle |
| 2560 | * @inode: The files inode |
| 2561 | * @path: The path to the leaf |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2562 | * @partial_cluster: The cluster which we'll have to free if all extents |
| 2563 | * has been released from it. It gets negative in case |
| 2564 | * that the cluster is still used. |
Allison Henderson | d583fb8 | 2011-05-25 07:41:43 -0400 | [diff] [blame] | 2565 | * @start: The first block to remove |
| 2566 | * @end: The last block to remove |
| 2567 | */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2568 | static int |
| 2569 | ext4_ext_rm_leaf(handle_t *handle, struct inode *inode, |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2570 | struct ext4_ext_path *path, |
| 2571 | long long *partial_cluster, |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2572 | ext4_lblk_t start, ext4_lblk_t end) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2573 | { |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2574 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2575 | int err = 0, correct_index = 0; |
| 2576 | int depth = ext_depth(inode), credits; |
| 2577 | struct ext4_extent_header *eh; |
Dmitry Monakhov | 750c9c4 | 2011-10-25 05:35:05 -0400 | [diff] [blame] | 2578 | ext4_lblk_t a, b; |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2579 | unsigned num; |
| 2580 | ext4_lblk_t ex_ee_block; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2581 | unsigned short ex_ee_len; |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 2582 | unsigned uninitialized = 0; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2583 | struct ext4_extent *ex; |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2584 | ext4_fsblk_t pblk; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2585 | |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 2586 | /* the header must be checked already in ext4_ext_remove_space() */ |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 2587 | ext_debug("truncate since %u in leaf to %u\n", start, end); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2588 | if (!path[depth].p_hdr) |
| 2589 | path[depth].p_hdr = ext_block_hdr(path[depth].p_bh); |
| 2590 | eh = path[depth].p_hdr; |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 2591 | if (unlikely(path[depth].p_hdr == NULL)) { |
| 2592 | EXT4_ERROR_INODE(inode, "path[%d].p_hdr == NULL", depth); |
| 2593 | return -EIO; |
| 2594 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2595 | /* find where to start removing */ |
Ashish Sangwan | 6ae06ff | 2013-07-01 08:12:41 -0400 | [diff] [blame] | 2596 | ex = path[depth].p_ext; |
| 2597 | if (!ex) |
| 2598 | ex = EXT_LAST_EXTENT(eh); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2599 | |
| 2600 | ex_ee_block = le32_to_cpu(ex->ee_block); |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 2601 | ex_ee_len = ext4_ext_get_actual_len(ex); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2602 | |
Aditya Kali | d899024 | 2011-09-09 19:18:51 -0400 | [diff] [blame] | 2603 | trace_ext4_ext_rm_leaf(inode, start, ex, *partial_cluster); |
| 2604 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2605 | while (ex >= EXT_FIRST_EXTENT(eh) && |
| 2606 | ex_ee_block + ex_ee_len > start) { |
Aneesh Kumar K.V | a41f207 | 2009-06-10 14:22:55 -0400 | [diff] [blame] | 2607 | |
| 2608 | if (ext4_ext_is_uninitialized(ex)) |
| 2609 | uninitialized = 1; |
| 2610 | else |
| 2611 | uninitialized = 0; |
| 2612 | |
Mingming | 553f900 | 2009-09-18 13:34:55 -0400 | [diff] [blame] | 2613 | ext_debug("remove ext %u:[%d]%d\n", ex_ee_block, |
| 2614 | uninitialized, ex_ee_len); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2615 | path[depth].p_ext = ex; |
| 2616 | |
| 2617 | a = ex_ee_block > start ? ex_ee_block : start; |
Allison Henderson | d583fb8 | 2011-05-25 07:41:43 -0400 | [diff] [blame] | 2618 | b = ex_ee_block+ex_ee_len - 1 < end ? |
| 2619 | ex_ee_block+ex_ee_len - 1 : end; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2620 | |
| 2621 | ext_debug(" border %u:%u\n", a, b); |
| 2622 | |
Allison Henderson | d583fb8 | 2011-05-25 07:41:43 -0400 | [diff] [blame] | 2623 | /* If this extent is beyond the end of the hole, skip it */ |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 2624 | if (end < ex_ee_block) { |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2625 | /* |
| 2626 | * We're going to skip this extent and move to another, |
| 2627 | * so if this extent is not cluster aligned we have |
| 2628 | * to mark the current cluster as used to avoid |
| 2629 | * accidentally freeing it later on |
| 2630 | */ |
| 2631 | pblk = ext4_ext_pblock(ex); |
| 2632 | if (pblk & (sbi->s_cluster_ratio - 1)) |
| 2633 | *partial_cluster = |
| 2634 | -((long long)EXT4_B2C(sbi, pblk)); |
Allison Henderson | d583fb8 | 2011-05-25 07:41:43 -0400 | [diff] [blame] | 2635 | ex--; |
| 2636 | ex_ee_block = le32_to_cpu(ex->ee_block); |
| 2637 | ex_ee_len = ext4_ext_get_actual_len(ex); |
| 2638 | continue; |
Dmitry Monakhov | 750c9c4 | 2011-10-25 05:35:05 -0400 | [diff] [blame] | 2639 | } else if (b != ex_ee_block + ex_ee_len - 1) { |
Lukas Czerner | dc1841d | 2012-03-19 23:07:43 -0400 | [diff] [blame] | 2640 | EXT4_ERROR_INODE(inode, |
| 2641 | "can not handle truncate %u:%u " |
| 2642 | "on extent %u:%u", |
| 2643 | start, end, ex_ee_block, |
| 2644 | ex_ee_block + ex_ee_len - 1); |
Dmitry Monakhov | 750c9c4 | 2011-10-25 05:35:05 -0400 | [diff] [blame] | 2645 | err = -EIO; |
| 2646 | goto out; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2647 | } else if (a != ex_ee_block) { |
| 2648 | /* remove tail of the extent */ |
Dmitry Monakhov | 750c9c4 | 2011-10-25 05:35:05 -0400 | [diff] [blame] | 2649 | num = a - ex_ee_block; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2650 | } else { |
| 2651 | /* remove whole extent: excellent! */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2652 | num = 0; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2653 | } |
Theodore Ts'o | 34071da | 2008-08-01 21:59:19 -0400 | [diff] [blame] | 2654 | /* |
| 2655 | * 3 for leaf, sb, and inode plus 2 (bmap and group |
| 2656 | * descriptor) for each block group; assume two block |
| 2657 | * groups plus ex_ee_len/blocks_per_block_group for |
| 2658 | * the worst case |
| 2659 | */ |
| 2660 | 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] | 2661 | if (ex == EXT_FIRST_EXTENT(eh)) { |
| 2662 | correct_index = 1; |
| 2663 | credits += (ext_depth(inode)) + 1; |
| 2664 | } |
Dmitry Monakhov | 5aca07e | 2009-12-08 22:42:15 -0500 | [diff] [blame] | 2665 | credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2666 | |
Jan Kara | 487caee | 2009-08-17 22:17:20 -0400 | [diff] [blame] | 2667 | err = ext4_ext_truncate_extend_restart(handle, inode, credits); |
Shen Feng | 9102e4f | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2668 | if (err) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2669 | goto out; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2670 | |
| 2671 | err = ext4_ext_get_access(handle, inode, path + depth); |
| 2672 | if (err) |
| 2673 | goto out; |
| 2674 | |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2675 | err = ext4_remove_blocks(handle, inode, ex, partial_cluster, |
| 2676 | a, b); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2677 | if (err) |
| 2678 | goto out; |
| 2679 | |
Dmitry Monakhov | 750c9c4 | 2011-10-25 05:35:05 -0400 | [diff] [blame] | 2680 | if (num == 0) |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 2681 | /* this extent is removed; mark slot entirely unused */ |
Alex Tomas | f65e6fb | 2006-10-11 01:21:05 -0700 | [diff] [blame] | 2682 | ext4_ext_store_pblock(ex, 0); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2683 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2684 | ex->ee_len = cpu_to_le16(num); |
Amit Arora | 749269f | 2007-07-18 09:02:56 -0400 | [diff] [blame] | 2685 | /* |
| 2686 | * Do not mark uninitialized if all the blocks in the |
| 2687 | * extent have been removed. |
| 2688 | */ |
| 2689 | if (uninitialized && num) |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 2690 | ext4_ext_mark_uninitialized(ex); |
Allison Henderson | d583fb8 | 2011-05-25 07:41:43 -0400 | [diff] [blame] | 2691 | /* |
| 2692 | * If the extent was completely released, |
| 2693 | * we need to remove it from the leaf |
| 2694 | */ |
| 2695 | if (num == 0) { |
Lukas Czerner | f17722f | 2011-06-06 00:05:17 -0400 | [diff] [blame] | 2696 | if (end != EXT_MAX_BLOCKS - 1) { |
Allison Henderson | d583fb8 | 2011-05-25 07:41:43 -0400 | [diff] [blame] | 2697 | /* |
| 2698 | * For hole punching, we need to scoot all the |
| 2699 | * extents up when an extent is removed so that |
| 2700 | * we dont have blank extents in the middle |
| 2701 | */ |
| 2702 | memmove(ex, ex+1, (EXT_LAST_EXTENT(eh) - ex) * |
| 2703 | sizeof(struct ext4_extent)); |
| 2704 | |
| 2705 | /* Now get rid of the one at the end */ |
| 2706 | memset(EXT_LAST_EXTENT(eh), 0, |
| 2707 | sizeof(struct ext4_extent)); |
| 2708 | } |
| 2709 | le16_add_cpu(&eh->eh_entries, -1); |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2710 | } else if (*partial_cluster > 0) |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2711 | *partial_cluster = 0; |
Allison Henderson | d583fb8 | 2011-05-25 07:41:43 -0400 | [diff] [blame] | 2712 | |
Dmitry Monakhov | 750c9c4 | 2011-10-25 05:35:05 -0400 | [diff] [blame] | 2713 | err = ext4_ext_dirty(handle, inode, path + depth); |
| 2714 | if (err) |
| 2715 | goto out; |
| 2716 | |
Yongqiang Yang | bf52c6f | 2011-11-01 18:59:26 -0400 | [diff] [blame] | 2717 | 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] | 2718 | ext4_ext_pblock(ex)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2719 | ex--; |
| 2720 | ex_ee_block = le32_to_cpu(ex->ee_block); |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 2721 | ex_ee_len = ext4_ext_get_actual_len(ex); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2722 | } |
| 2723 | |
| 2724 | if (correct_index && eh->eh_entries) |
| 2725 | err = ext4_ext_correct_indexes(handle, inode, path); |
| 2726 | |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2727 | /* |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2728 | * Free the partial cluster only if the current extent does not |
| 2729 | * reference it. Otherwise we might free used cluster. |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2730 | */ |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2731 | if (*partial_cluster > 0 && |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2732 | (EXT4_B2C(sbi, ext4_ext_pblock(ex) + ex_ee_len - 1) != |
| 2733 | *partial_cluster)) { |
Theodore Ts'o | 981250c | 2013-06-12 11:48:29 -0400 | [diff] [blame] | 2734 | int flags = get_default_free_blocks_flags(inode); |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2735 | |
| 2736 | ext4_free_blocks(handle, inode, NULL, |
| 2737 | EXT4_C2B(sbi, *partial_cluster), |
| 2738 | sbi->s_cluster_ratio, flags); |
| 2739 | *partial_cluster = 0; |
| 2740 | } |
| 2741 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2742 | /* if this leaf is free, then we should |
| 2743 | * remove it from index block above */ |
| 2744 | if (err == 0 && eh->eh_entries == 0 && path[depth].p_bh != NULL) |
Forrest Liu | c36575e | 2012-12-17 09:55:39 -0500 | [diff] [blame] | 2745 | err = ext4_ext_rm_idx(handle, inode, path, depth); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2746 | |
| 2747 | out: |
| 2748 | return err; |
| 2749 | } |
| 2750 | |
| 2751 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 2752 | * ext4_ext_more_to_rm: |
| 2753 | * returns 1 if current index has to be freed (even partial) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2754 | */ |
Avantika Mathur | 09b8825 | 2006-12-06 20:41:36 -0800 | [diff] [blame] | 2755 | static int |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2756 | ext4_ext_more_to_rm(struct ext4_ext_path *path) |
| 2757 | { |
| 2758 | BUG_ON(path->p_idx == NULL); |
| 2759 | |
| 2760 | if (path->p_idx < EXT_FIRST_INDEX(path->p_hdr)) |
| 2761 | return 0; |
| 2762 | |
| 2763 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 2764 | * if truncate on deeper level happened, it wasn't partial, |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2765 | * so we have to consider current index for truncation |
| 2766 | */ |
| 2767 | if (le16_to_cpu(path->p_hdr->eh_entries) == path->p_block) |
| 2768 | return 0; |
| 2769 | return 1; |
| 2770 | } |
| 2771 | |
Theodore Ts'o | 26a4c0c | 2013-04-03 12:45:17 -0400 | [diff] [blame] | 2772 | int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, |
| 2773 | ext4_lblk_t end) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2774 | { |
| 2775 | struct super_block *sb = inode->i_sb; |
| 2776 | int depth = ext_depth(inode); |
Ashish Sangwan | 968dee7 | 2012-07-22 22:49:08 -0400 | [diff] [blame] | 2777 | struct ext4_ext_path *path = NULL; |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2778 | long long partial_cluster = 0; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2779 | handle_t *handle; |
Dmitry Monakhov | 6f2080e | 2012-09-30 23:03:50 -0400 | [diff] [blame] | 2780 | int i = 0, err = 0; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2781 | |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 2782 | ext_debug("truncate since %u to %u\n", start, end); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2783 | |
| 2784 | /* 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] | 2785 | handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE, depth + 1); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2786 | if (IS_ERR(handle)) |
| 2787 | return PTR_ERR(handle); |
| 2788 | |
Dmitry Monakhov | 0617b83 | 2010-05-17 01:00:00 -0400 | [diff] [blame] | 2789 | again: |
Lukas Czerner | 6180132 | 2013-05-27 23:32:35 -0400 | [diff] [blame] | 2790 | trace_ext4_ext_remove_space(inode, start, end, depth); |
Aditya Kali | d899024 | 2011-09-09 19:18:51 -0400 | [diff] [blame] | 2791 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2792 | /* |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 2793 | * Check if we are removing extents inside the extent tree. If that |
| 2794 | * is the case, we are going to punch a hole inside the extent tree |
| 2795 | * so we have to check whether we need to split the extent covering |
| 2796 | * the last block to remove so we can easily remove the part of it |
| 2797 | * in ext4_ext_rm_leaf(). |
| 2798 | */ |
| 2799 | if (end < EXT_MAX_BLOCKS - 1) { |
| 2800 | struct ext4_extent *ex; |
| 2801 | ext4_lblk_t ee_block; |
| 2802 | |
| 2803 | /* find extent for this block */ |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 2804 | path = ext4_ext_find_extent(inode, end, NULL, EXT4_EX_NOCACHE); |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 2805 | if (IS_ERR(path)) { |
| 2806 | ext4_journal_stop(handle); |
| 2807 | return PTR_ERR(path); |
| 2808 | } |
| 2809 | depth = ext_depth(inode); |
Dmitry Monakhov | 6f2080e | 2012-09-30 23:03:50 -0400 | [diff] [blame] | 2810 | /* 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] | 2811 | ex = path[depth].p_ext; |
Ashish Sangwan | 968dee7 | 2012-07-22 22:49:08 -0400 | [diff] [blame] | 2812 | if (!ex) { |
Dmitry Monakhov | 6f2080e | 2012-09-30 23:03:50 -0400 | [diff] [blame] | 2813 | if (depth) { |
| 2814 | EXT4_ERROR_INODE(inode, |
| 2815 | "path[%d].p_hdr == NULL", |
| 2816 | depth); |
| 2817 | err = -EIO; |
| 2818 | } |
| 2819 | goto out; |
Ashish Sangwan | 968dee7 | 2012-07-22 22:49:08 -0400 | [diff] [blame] | 2820 | } |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 2821 | |
| 2822 | ee_block = le32_to_cpu(ex->ee_block); |
| 2823 | |
| 2824 | /* |
| 2825 | * See if the last block is inside the extent, if so split |
| 2826 | * the extent at 'end' block so we can easily remove the |
| 2827 | * tail of the first part of the split extent in |
| 2828 | * ext4_ext_rm_leaf(). |
| 2829 | */ |
| 2830 | if (end >= ee_block && |
| 2831 | end < ee_block + ext4_ext_get_actual_len(ex) - 1) { |
| 2832 | int split_flag = 0; |
| 2833 | |
| 2834 | if (ext4_ext_is_uninitialized(ex)) |
| 2835 | split_flag = EXT4_EXT_MARK_UNINIT1 | |
| 2836 | EXT4_EXT_MARK_UNINIT2; |
| 2837 | |
| 2838 | /* |
| 2839 | * Split the extent in two so that 'end' is the last |
Lukas Czerner | 27dd438 | 2013-04-09 22:11:22 -0400 | [diff] [blame] | 2840 | * block in the first new extent. Also we should not |
| 2841 | * fail removing space due to ENOSPC so try to use |
| 2842 | * reserved block if that happens. |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 2843 | */ |
| 2844 | err = ext4_split_extent_at(handle, inode, path, |
Lukas Czerner | 27dd438 | 2013-04-09 22:11:22 -0400 | [diff] [blame] | 2845 | end + 1, split_flag, |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 2846 | EXT4_EX_NOCACHE | |
Lukas Czerner | 27dd438 | 2013-04-09 22:11:22 -0400 | [diff] [blame] | 2847 | EXT4_GET_BLOCKS_PRE_IO | |
| 2848 | EXT4_GET_BLOCKS_METADATA_NOFAIL); |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 2849 | |
| 2850 | if (err < 0) |
| 2851 | goto out; |
| 2852 | } |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 2853 | } |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 2854 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 2855 | * We start scanning from right side, freeing all the blocks |
| 2856 | * after i_size and walking into the tree depth-wise. |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2857 | */ |
Dmitry Monakhov | 0617b83 | 2010-05-17 01:00:00 -0400 | [diff] [blame] | 2858 | depth = ext_depth(inode); |
Ashish Sangwan | 968dee7 | 2012-07-22 22:49:08 -0400 | [diff] [blame] | 2859 | if (path) { |
| 2860 | int k = i = depth; |
| 2861 | while (--k > 0) |
| 2862 | path[k].p_block = |
| 2863 | le16_to_cpu(path[k].p_hdr->eh_entries)+1; |
| 2864 | } else { |
| 2865 | path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 1), |
| 2866 | GFP_NOFS); |
| 2867 | if (path == NULL) { |
| 2868 | ext4_journal_stop(handle); |
| 2869 | return -ENOMEM; |
| 2870 | } |
| 2871 | path[0].p_depth = depth; |
| 2872 | path[0].p_hdr = ext_inode_hdr(inode); |
Theodore Ts'o | 89a4e48 | 2012-08-17 08:54:52 -0400 | [diff] [blame] | 2873 | i = 0; |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 2874 | |
Theodore Ts'o | c349179 | 2013-08-16 21:21:41 -0400 | [diff] [blame] | 2875 | if (ext4_ext_check(inode, path[0].p_hdr, depth, 0)) { |
Ashish Sangwan | 968dee7 | 2012-07-22 22:49:08 -0400 | [diff] [blame] | 2876 | err = -EIO; |
| 2877 | goto out; |
| 2878 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2879 | } |
Ashish Sangwan | 968dee7 | 2012-07-22 22:49:08 -0400 | [diff] [blame] | 2880 | err = 0; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2881 | |
| 2882 | while (i >= 0 && err == 0) { |
| 2883 | if (i == depth) { |
| 2884 | /* this is leaf block */ |
Allison Henderson | d583fb8 | 2011-05-25 07:41:43 -0400 | [diff] [blame] | 2885 | err = ext4_ext_rm_leaf(handle, inode, path, |
Theodore Ts'o | 0aa0600 | 2011-09-09 18:54:51 -0400 | [diff] [blame] | 2886 | &partial_cluster, start, |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 2887 | end); |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 2888 | /* root level has p_bh == NULL, brelse() eats this */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2889 | brelse(path[i].p_bh); |
| 2890 | path[i].p_bh = NULL; |
| 2891 | i--; |
| 2892 | continue; |
| 2893 | } |
| 2894 | |
| 2895 | /* this is index block */ |
| 2896 | if (!path[i].p_hdr) { |
| 2897 | ext_debug("initialize header\n"); |
| 2898 | path[i].p_hdr = ext_block_hdr(path[i].p_bh); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2899 | } |
| 2900 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2901 | if (!path[i].p_idx) { |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 2902 | /* this level hasn't been touched yet */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2903 | path[i].p_idx = EXT_LAST_INDEX(path[i].p_hdr); |
| 2904 | path[i].p_block = le16_to_cpu(path[i].p_hdr->eh_entries)+1; |
| 2905 | ext_debug("init index ptr: hdr 0x%p, num %d\n", |
| 2906 | path[i].p_hdr, |
| 2907 | le16_to_cpu(path[i].p_hdr->eh_entries)); |
| 2908 | } else { |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 2909 | /* we were already here, see at next index */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2910 | path[i].p_idx--; |
| 2911 | } |
| 2912 | |
| 2913 | ext_debug("level %d - index, first 0x%p, cur 0x%p\n", |
| 2914 | i, EXT_FIRST_INDEX(path[i].p_hdr), |
| 2915 | path[i].p_idx); |
| 2916 | if (ext4_ext_more_to_rm(path + i)) { |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 2917 | struct buffer_head *bh; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2918 | /* go to the next level */ |
Mingming Cao | 2ae0210 | 2006-10-11 01:21:11 -0700 | [diff] [blame] | 2919 | ext_debug("move to level %d (block %llu)\n", |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 2920 | i + 1, ext4_idx_pblock(path[i].p_idx)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2921 | memset(path + i + 1, 0, sizeof(*path)); |
Theodore Ts'o | 7d7ea89 | 2013-08-16 21:20:41 -0400 | [diff] [blame] | 2922 | bh = read_extent_tree_block(inode, |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 2923 | ext4_idx_pblock(path[i].p_idx), depth - i - 1, |
| 2924 | EXT4_EX_NOCACHE); |
Theodore Ts'o | 7d7ea89 | 2013-08-16 21:20:41 -0400 | [diff] [blame] | 2925 | if (IS_ERR(bh)) { |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2926 | /* should we reset i_size? */ |
Theodore Ts'o | 7d7ea89 | 2013-08-16 21:20:41 -0400 | [diff] [blame] | 2927 | err = PTR_ERR(bh); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2928 | break; |
| 2929 | } |
Theodore Ts'o | 76828c8 | 2013-07-15 12:27:47 -0400 | [diff] [blame] | 2930 | /* Yield here to deal with large extent trees. |
| 2931 | * Should be a no-op if we did IO above. */ |
| 2932 | cond_resched(); |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 2933 | if (WARN_ON(i + 1 > depth)) { |
| 2934 | err = -EIO; |
| 2935 | break; |
| 2936 | } |
Alex Tomas | c29c0ae | 2007-07-18 09:19:09 -0400 | [diff] [blame] | 2937 | path[i + 1].p_bh = bh; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2938 | |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 2939 | /* save actual number of indexes since this |
| 2940 | * number is changed at the next iteration */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2941 | path[i].p_block = le16_to_cpu(path[i].p_hdr->eh_entries); |
| 2942 | i++; |
| 2943 | } else { |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 2944 | /* we finished processing this index, go up */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2945 | if (path[i].p_hdr->eh_entries == 0 && i > 0) { |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 2946 | /* index is empty, remove it; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2947 | * handle must be already prepared by the |
| 2948 | * truncatei_leaf() */ |
Forrest Liu | c36575e | 2012-12-17 09:55:39 -0500 | [diff] [blame] | 2949 | err = ext4_ext_rm_idx(handle, inode, path, i); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2950 | } |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 2951 | /* root level has p_bh == NULL, brelse() eats this */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2952 | brelse(path[i].p_bh); |
| 2953 | path[i].p_bh = NULL; |
| 2954 | i--; |
| 2955 | ext_debug("return to level %d\n", i); |
| 2956 | } |
| 2957 | } |
| 2958 | |
Lukas Czerner | 6180132 | 2013-05-27 23:32:35 -0400 | [diff] [blame] | 2959 | trace_ext4_ext_remove_space_done(inode, start, end, depth, |
| 2960 | partial_cluster, path->p_hdr->eh_entries); |
Aditya Kali | d899024 | 2011-09-09 19:18:51 -0400 | [diff] [blame] | 2961 | |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 2962 | /* If we still have something in the partial cluster and we have removed |
| 2963 | * even the first extent, then we should free the blocks in the partial |
| 2964 | * cluster as well. */ |
Lukas Czerner | d23142c | 2013-05-27 23:33:35 -0400 | [diff] [blame] | 2965 | if (partial_cluster > 0 && path->p_hdr->eh_entries == 0) { |
Theodore Ts'o | 981250c | 2013-06-12 11:48:29 -0400 | [diff] [blame] | 2966 | int flags = get_default_free_blocks_flags(inode); |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 2967 | |
| 2968 | ext4_free_blocks(handle, inode, NULL, |
| 2969 | EXT4_C2B(EXT4_SB(sb), partial_cluster), |
| 2970 | EXT4_SB(sb)->s_cluster_ratio, flags); |
| 2971 | partial_cluster = 0; |
| 2972 | } |
| 2973 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2974 | /* TODO: flexible tree reduction should be here */ |
| 2975 | if (path->p_hdr->eh_entries == 0) { |
| 2976 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 2977 | * truncate to zero freed all the tree, |
| 2978 | * so we need to correct eh_depth |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2979 | */ |
| 2980 | err = ext4_ext_get_access(handle, inode, path); |
| 2981 | if (err == 0) { |
| 2982 | ext_inode_hdr(inode)->eh_depth = 0; |
| 2983 | ext_inode_hdr(inode)->eh_max = |
Theodore Ts'o | 55ad63b | 2009-08-28 10:40:33 -0400 | [diff] [blame] | 2984 | cpu_to_le16(ext4_ext_space_root(inode, 0)); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2985 | err = ext4_ext_dirty(handle, inode, path); |
| 2986 | } |
| 2987 | } |
| 2988 | out: |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2989 | ext4_ext_drop_refs(path); |
| 2990 | kfree(path); |
Ashish Sangwan | 968dee7 | 2012-07-22 22:49:08 -0400 | [diff] [blame] | 2991 | if (err == -EAGAIN) { |
| 2992 | path = NULL; |
Dmitry Monakhov | 0617b83 | 2010-05-17 01:00:00 -0400 | [diff] [blame] | 2993 | goto again; |
Ashish Sangwan | 968dee7 | 2012-07-22 22:49:08 -0400 | [diff] [blame] | 2994 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 2995 | ext4_journal_stop(handle); |
| 2996 | |
| 2997 | return err; |
| 2998 | } |
| 2999 | |
| 3000 | /* |
| 3001 | * called at mount time |
| 3002 | */ |
| 3003 | void ext4_ext_init(struct super_block *sb) |
| 3004 | { |
| 3005 | /* |
| 3006 | * possible initialization would be here |
| 3007 | */ |
| 3008 | |
Theodore Ts'o | 83982b6 | 2009-01-06 14:53:16 -0500 | [diff] [blame] | 3009 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) { |
Theodore Ts'o | 90576c0 | 2009-09-29 15:51:30 -0400 | [diff] [blame] | 3010 | #if defined(AGGRESSIVE_TEST) || defined(CHECK_BINSEARCH) || defined(EXTENTS_STATS) |
Theodore Ts'o | 92b9781 | 2012-03-19 23:41:49 -0400 | [diff] [blame] | 3011 | printk(KERN_INFO "EXT4-fs: file extents enabled" |
Robert P. J. Day | bbf2f9f | 2007-02-17 19:20:16 +0100 | [diff] [blame] | 3012 | #ifdef AGGRESSIVE_TEST |
Theodore Ts'o | 92b9781 | 2012-03-19 23:41:49 -0400 | [diff] [blame] | 3013 | ", aggressive tests" |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 3014 | #endif |
| 3015 | #ifdef CHECK_BINSEARCH |
Theodore Ts'o | 92b9781 | 2012-03-19 23:41:49 -0400 | [diff] [blame] | 3016 | ", check binsearch" |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 3017 | #endif |
| 3018 | #ifdef EXTENTS_STATS |
Theodore Ts'o | 92b9781 | 2012-03-19 23:41:49 -0400 | [diff] [blame] | 3019 | ", stats" |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 3020 | #endif |
Theodore Ts'o | 92b9781 | 2012-03-19 23:41:49 -0400 | [diff] [blame] | 3021 | "\n"); |
Theodore Ts'o | 90576c0 | 2009-09-29 15:51:30 -0400 | [diff] [blame] | 3022 | #endif |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 3023 | #ifdef EXTENTS_STATS |
| 3024 | spin_lock_init(&EXT4_SB(sb)->s_ext_stats_lock); |
| 3025 | EXT4_SB(sb)->s_ext_min = 1 << 30; |
| 3026 | EXT4_SB(sb)->s_ext_max = 0; |
| 3027 | #endif |
| 3028 | } |
| 3029 | } |
| 3030 | |
| 3031 | /* |
| 3032 | * called at umount time |
| 3033 | */ |
| 3034 | void ext4_ext_release(struct super_block *sb) |
| 3035 | { |
Theodore Ts'o | 83982b6 | 2009-01-06 14:53:16 -0500 | [diff] [blame] | 3036 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 3037 | return; |
| 3038 | |
| 3039 | #ifdef EXTENTS_STATS |
| 3040 | if (EXT4_SB(sb)->s_ext_blocks && EXT4_SB(sb)->s_ext_extents) { |
| 3041 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
| 3042 | printk(KERN_ERR "EXT4-fs: %lu blocks in %lu extents (%lu ave)\n", |
| 3043 | sbi->s_ext_blocks, sbi->s_ext_extents, |
| 3044 | sbi->s_ext_blocks / sbi->s_ext_extents); |
| 3045 | printk(KERN_ERR "EXT4-fs: extents: %lu min, %lu max, max depth %lu\n", |
| 3046 | sbi->s_ext_min, sbi->s_ext_max, sbi->s_depth_max); |
| 3047 | } |
| 3048 | #endif |
| 3049 | } |
| 3050 | |
Zheng Liu | d7b2a00 | 2013-08-28 14:47:06 -0400 | [diff] [blame] | 3051 | static int ext4_zeroout_es(struct inode *inode, struct ext4_extent *ex) |
| 3052 | { |
| 3053 | ext4_lblk_t ee_block; |
| 3054 | ext4_fsblk_t ee_pblock; |
| 3055 | unsigned int ee_len; |
| 3056 | |
| 3057 | ee_block = le32_to_cpu(ex->ee_block); |
| 3058 | ee_len = ext4_ext_get_actual_len(ex); |
| 3059 | ee_pblock = ext4_ext_pblock(ex); |
| 3060 | |
| 3061 | if (ee_len == 0) |
| 3062 | return 0; |
| 3063 | |
| 3064 | return ext4_es_insert_extent(inode, ee_block, ee_len, ee_pblock, |
| 3065 | EXTENT_STATUS_WRITTEN); |
| 3066 | } |
| 3067 | |
Aneesh Kumar K.V | 093a088 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 3068 | /* FIXME!! we need to try to merge to left or right after zero-out */ |
| 3069 | static int ext4_ext_zeroout(struct inode *inode, struct ext4_extent *ex) |
| 3070 | { |
Lukas Czerner | 2407518 | 2010-10-27 21:30:06 -0400 | [diff] [blame] | 3071 | ext4_fsblk_t ee_pblock; |
| 3072 | unsigned int ee_len; |
Jing Zhang | b720303 | 2010-05-12 00:00:00 -0400 | [diff] [blame] | 3073 | int ret; |
Aneesh Kumar K.V | 093a088 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 3074 | |
Aneesh Kumar K.V | 093a088 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 3075 | ee_len = ext4_ext_get_actual_len(ex); |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 3076 | ee_pblock = ext4_ext_pblock(ex); |
Aneesh Kumar K.V | 093a088 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 3077 | |
Theodore Ts'o | a107e5a | 2010-10-27 23:44:47 -0400 | [diff] [blame] | 3078 | 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] | 3079 | if (ret > 0) |
| 3080 | ret = 0; |
Aneesh Kumar K.V | 093a088 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 3081 | |
Lukas Czerner | 2407518 | 2010-10-27 21:30:06 -0400 | [diff] [blame] | 3082 | return ret; |
Aneesh Kumar K.V | 093a088 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 3083 | } |
| 3084 | |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3085 | /* |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3086 | * ext4_split_extent_at() splits an extent at given block. |
| 3087 | * |
| 3088 | * @handle: the journal handle |
| 3089 | * @inode: the file inode |
| 3090 | * @path: the path to the extent |
| 3091 | * @split: the logical block where the extent is splitted. |
| 3092 | * @split_flags: indicates if the extent could be zeroout if split fails, and |
| 3093 | * the states(init or uninit) of new extents. |
| 3094 | * @flags: flags used to insert new extent to extent tree. |
| 3095 | * |
| 3096 | * |
| 3097 | * Splits extent [a, b] into two extents [a, @split) and [@split, b], states |
| 3098 | * of which are deterimined by split_flag. |
| 3099 | * |
| 3100 | * There are two cases: |
| 3101 | * a> the extent are splitted into two extent. |
| 3102 | * b> split is not needed, and just mark the extent. |
| 3103 | * |
| 3104 | * return 0 on success. |
| 3105 | */ |
| 3106 | static int ext4_split_extent_at(handle_t *handle, |
| 3107 | struct inode *inode, |
| 3108 | struct ext4_ext_path *path, |
| 3109 | ext4_lblk_t split, |
| 3110 | int split_flag, |
| 3111 | int flags) |
| 3112 | { |
| 3113 | ext4_fsblk_t newblock; |
| 3114 | ext4_lblk_t ee_block; |
Zheng Liu | adb2355 | 2013-03-10 21:13:05 -0400 | [diff] [blame] | 3115 | struct ext4_extent *ex, newex, orig_ex, zero_ex; |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3116 | struct ext4_extent *ex2 = NULL; |
| 3117 | unsigned int ee_len, depth; |
| 3118 | int err = 0; |
| 3119 | |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3120 | BUG_ON((split_flag & (EXT4_EXT_DATA_VALID1 | EXT4_EXT_DATA_VALID2)) == |
| 3121 | (EXT4_EXT_DATA_VALID1 | EXT4_EXT_DATA_VALID2)); |
| 3122 | |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3123 | ext_debug("ext4_split_extents_at: inode %lu, logical" |
| 3124 | "block %llu\n", inode->i_ino, (unsigned long long)split); |
| 3125 | |
| 3126 | ext4_ext_show_leaf(inode, path); |
| 3127 | |
| 3128 | depth = ext_depth(inode); |
| 3129 | ex = path[depth].p_ext; |
| 3130 | ee_block = le32_to_cpu(ex->ee_block); |
| 3131 | ee_len = ext4_ext_get_actual_len(ex); |
| 3132 | newblock = split - ee_block + ext4_ext_pblock(ex); |
| 3133 | |
| 3134 | BUG_ON(split < ee_block || split >= (ee_block + ee_len)); |
Dmitry Monakhov | 357b66f | 2013-03-04 00:34:34 -0500 | [diff] [blame] | 3135 | BUG_ON(!ext4_ext_is_uninitialized(ex) && |
| 3136 | split_flag & (EXT4_EXT_MAY_ZEROOUT | |
| 3137 | EXT4_EXT_MARK_UNINIT1 | |
| 3138 | EXT4_EXT_MARK_UNINIT2)); |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3139 | |
| 3140 | err = ext4_ext_get_access(handle, inode, path + depth); |
| 3141 | if (err) |
| 3142 | goto out; |
| 3143 | |
| 3144 | if (split == ee_block) { |
| 3145 | /* |
| 3146 | * case b: block @split is the block that the extent begins with |
| 3147 | * then we just change the state of the extent, and splitting |
| 3148 | * is not needed. |
| 3149 | */ |
| 3150 | if (split_flag & EXT4_EXT_MARK_UNINIT2) |
| 3151 | ext4_ext_mark_uninitialized(ex); |
| 3152 | else |
| 3153 | ext4_ext_mark_initialized(ex); |
| 3154 | |
| 3155 | if (!(flags & EXT4_GET_BLOCKS_PRE_IO)) |
Theodore Ts'o | ecb94f5 | 2012-08-17 09:44:17 -0400 | [diff] [blame] | 3156 | ext4_ext_try_to_merge(handle, inode, path, ex); |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3157 | |
Theodore Ts'o | ecb94f5 | 2012-08-17 09:44:17 -0400 | [diff] [blame] | 3158 | err = ext4_ext_dirty(handle, inode, path + path->p_depth); |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3159 | goto out; |
| 3160 | } |
| 3161 | |
| 3162 | /* case a */ |
| 3163 | memcpy(&orig_ex, ex, sizeof(orig_ex)); |
| 3164 | ex->ee_len = cpu_to_le16(split - ee_block); |
| 3165 | if (split_flag & EXT4_EXT_MARK_UNINIT1) |
| 3166 | ext4_ext_mark_uninitialized(ex); |
| 3167 | |
| 3168 | /* |
| 3169 | * path may lead to new leaf, not to original leaf any more |
| 3170 | * after ext4_ext_insert_extent() returns, |
| 3171 | */ |
| 3172 | err = ext4_ext_dirty(handle, inode, path + depth); |
| 3173 | if (err) |
| 3174 | goto fix_extent_len; |
| 3175 | |
| 3176 | ex2 = &newex; |
| 3177 | ex2->ee_block = cpu_to_le32(split); |
| 3178 | ex2->ee_len = cpu_to_le16(ee_len - (split - ee_block)); |
| 3179 | ext4_ext_store_pblock(ex2, newblock); |
| 3180 | if (split_flag & EXT4_EXT_MARK_UNINIT2) |
| 3181 | ext4_ext_mark_uninitialized(ex2); |
| 3182 | |
| 3183 | err = ext4_ext_insert_extent(handle, inode, path, &newex, flags); |
| 3184 | if (err == -ENOSPC && (EXT4_EXT_MAY_ZEROOUT & split_flag)) { |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3185 | if (split_flag & (EXT4_EXT_DATA_VALID1|EXT4_EXT_DATA_VALID2)) { |
Zheng Liu | adb2355 | 2013-03-10 21:13:05 -0400 | [diff] [blame] | 3186 | if (split_flag & EXT4_EXT_DATA_VALID1) { |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3187 | err = ext4_ext_zeroout(inode, ex2); |
Zheng Liu | adb2355 | 2013-03-10 21:13:05 -0400 | [diff] [blame] | 3188 | zero_ex.ee_block = ex2->ee_block; |
Zheng Liu | 8cde7ad | 2013-04-03 12:27:18 -0400 | [diff] [blame] | 3189 | zero_ex.ee_len = cpu_to_le16( |
| 3190 | ext4_ext_get_actual_len(ex2)); |
Zheng Liu | adb2355 | 2013-03-10 21:13:05 -0400 | [diff] [blame] | 3191 | ext4_ext_store_pblock(&zero_ex, |
| 3192 | ext4_ext_pblock(ex2)); |
| 3193 | } else { |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3194 | err = ext4_ext_zeroout(inode, ex); |
Zheng Liu | adb2355 | 2013-03-10 21:13:05 -0400 | [diff] [blame] | 3195 | zero_ex.ee_block = ex->ee_block; |
Zheng Liu | 8cde7ad | 2013-04-03 12:27:18 -0400 | [diff] [blame] | 3196 | zero_ex.ee_len = cpu_to_le16( |
| 3197 | ext4_ext_get_actual_len(ex)); |
Zheng Liu | adb2355 | 2013-03-10 21:13:05 -0400 | [diff] [blame] | 3198 | ext4_ext_store_pblock(&zero_ex, |
| 3199 | ext4_ext_pblock(ex)); |
| 3200 | } |
| 3201 | } else { |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3202 | err = ext4_ext_zeroout(inode, &orig_ex); |
Zheng Liu | adb2355 | 2013-03-10 21:13:05 -0400 | [diff] [blame] | 3203 | zero_ex.ee_block = orig_ex.ee_block; |
Zheng Liu | 8cde7ad | 2013-04-03 12:27:18 -0400 | [diff] [blame] | 3204 | zero_ex.ee_len = cpu_to_le16( |
| 3205 | ext4_ext_get_actual_len(&orig_ex)); |
Zheng Liu | adb2355 | 2013-03-10 21:13:05 -0400 | [diff] [blame] | 3206 | ext4_ext_store_pblock(&zero_ex, |
| 3207 | ext4_ext_pblock(&orig_ex)); |
| 3208 | } |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3209 | |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3210 | if (err) |
| 3211 | goto fix_extent_len; |
| 3212 | /* update the extent length and mark as initialized */ |
Al Viro | af1584f | 2012-04-12 20:32:25 -0400 | [diff] [blame] | 3213 | ex->ee_len = cpu_to_le16(ee_len); |
Theodore Ts'o | ecb94f5 | 2012-08-17 09:44:17 -0400 | [diff] [blame] | 3214 | ext4_ext_try_to_merge(handle, inode, path, ex); |
| 3215 | err = ext4_ext_dirty(handle, inode, path + path->p_depth); |
Zheng Liu | adb2355 | 2013-03-10 21:13:05 -0400 | [diff] [blame] | 3216 | if (err) |
| 3217 | goto fix_extent_len; |
| 3218 | |
| 3219 | /* update extent status tree */ |
Zheng Liu | d7b2a00 | 2013-08-28 14:47:06 -0400 | [diff] [blame] | 3220 | err = ext4_zeroout_es(inode, &zero_ex); |
Zheng Liu | adb2355 | 2013-03-10 21:13:05 -0400 | [diff] [blame] | 3221 | |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3222 | goto out; |
| 3223 | } else if (err) |
| 3224 | goto fix_extent_len; |
| 3225 | |
| 3226 | out: |
| 3227 | ext4_ext_show_leaf(inode, path); |
| 3228 | return err; |
| 3229 | |
| 3230 | fix_extent_len: |
| 3231 | ex->ee_len = orig_ex.ee_len; |
| 3232 | ext4_ext_dirty(handle, inode, path + depth); |
| 3233 | return err; |
| 3234 | } |
| 3235 | |
| 3236 | /* |
| 3237 | * ext4_split_extents() splits an extent and mark extent which is covered |
| 3238 | * by @map as split_flags indicates |
| 3239 | * |
Anatol Pomozov | 70261f5 | 2013-08-28 14:40:12 -0400 | [diff] [blame] | 3240 | * 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] | 3241 | * There are three possibilities: |
| 3242 | * a> There is no split required |
| 3243 | * b> Splits in two extents: Split is happening at either end of the extent |
| 3244 | * c> Splits in three extents: Somone is splitting in middle of the extent |
| 3245 | * |
| 3246 | */ |
| 3247 | static int ext4_split_extent(handle_t *handle, |
| 3248 | struct inode *inode, |
| 3249 | struct ext4_ext_path *path, |
| 3250 | struct ext4_map_blocks *map, |
| 3251 | int split_flag, |
| 3252 | int flags) |
| 3253 | { |
| 3254 | ext4_lblk_t ee_block; |
| 3255 | struct ext4_extent *ex; |
| 3256 | unsigned int ee_len, depth; |
| 3257 | int err = 0; |
| 3258 | int uninitialized; |
| 3259 | int split_flag1, flags1; |
Zheng Liu | 3a22567 | 2013-03-10 21:20:23 -0400 | [diff] [blame] | 3260 | int allocated = map->m_len; |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3261 | |
| 3262 | depth = ext_depth(inode); |
| 3263 | ex = path[depth].p_ext; |
| 3264 | ee_block = le32_to_cpu(ex->ee_block); |
| 3265 | ee_len = ext4_ext_get_actual_len(ex); |
| 3266 | uninitialized = ext4_ext_is_uninitialized(ex); |
| 3267 | |
| 3268 | if (map->m_lblk + map->m_len < ee_block + ee_len) { |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3269 | split_flag1 = split_flag & EXT4_EXT_MAY_ZEROOUT; |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3270 | flags1 = flags | EXT4_GET_BLOCKS_PRE_IO; |
| 3271 | if (uninitialized) |
| 3272 | split_flag1 |= EXT4_EXT_MARK_UNINIT1 | |
| 3273 | EXT4_EXT_MARK_UNINIT2; |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3274 | if (split_flag & EXT4_EXT_DATA_VALID2) |
| 3275 | split_flag1 |= EXT4_EXT_DATA_VALID1; |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3276 | err = ext4_split_extent_at(handle, inode, path, |
| 3277 | map->m_lblk + map->m_len, split_flag1, flags1); |
Yongqiang Yang | 9391741 | 2011-05-22 20:49:12 -0400 | [diff] [blame] | 3278 | if (err) |
| 3279 | goto out; |
Zheng Liu | 3a22567 | 2013-03-10 21:20:23 -0400 | [diff] [blame] | 3280 | } else { |
| 3281 | allocated = ee_len - (map->m_lblk - ee_block); |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3282 | } |
Dmitry Monakhov | 357b66f | 2013-03-04 00:34:34 -0500 | [diff] [blame] | 3283 | /* |
| 3284 | * Update path is required because previous ext4_split_extent_at() may |
| 3285 | * result in split of original leaf or extent zeroout. |
| 3286 | */ |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3287 | ext4_ext_drop_refs(path); |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 3288 | path = ext4_ext_find_extent(inode, map->m_lblk, path, 0); |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3289 | if (IS_ERR(path)) |
| 3290 | return PTR_ERR(path); |
Dmitry Monakhov | 357b66f | 2013-03-04 00:34:34 -0500 | [diff] [blame] | 3291 | depth = ext_depth(inode); |
| 3292 | ex = path[depth].p_ext; |
| 3293 | uninitialized = ext4_ext_is_uninitialized(ex); |
| 3294 | split_flag1 = 0; |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3295 | |
| 3296 | if (map->m_lblk >= ee_block) { |
Dmitry Monakhov | 357b66f | 2013-03-04 00:34:34 -0500 | [diff] [blame] | 3297 | split_flag1 = split_flag & EXT4_EXT_DATA_VALID2; |
| 3298 | if (uninitialized) { |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3299 | split_flag1 |= EXT4_EXT_MARK_UNINIT1; |
Dmitry Monakhov | 357b66f | 2013-03-04 00:34:34 -0500 | [diff] [blame] | 3300 | split_flag1 |= split_flag & (EXT4_EXT_MAY_ZEROOUT | |
| 3301 | EXT4_EXT_MARK_UNINIT2); |
| 3302 | } |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3303 | err = ext4_split_extent_at(handle, inode, path, |
| 3304 | map->m_lblk, split_flag1, flags); |
| 3305 | if (err) |
| 3306 | goto out; |
| 3307 | } |
| 3308 | |
| 3309 | ext4_ext_show_leaf(inode, path); |
| 3310 | out: |
Zheng Liu | 3a22567 | 2013-03-10 21:20:23 -0400 | [diff] [blame] | 3311 | return err ? err : allocated; |
Yongqiang Yang | 47ea3bb | 2011-05-03 12:23:07 -0400 | [diff] [blame] | 3312 | } |
| 3313 | |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 3314 | /* |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 3315 | * This function is called by ext4_ext_map_blocks() if someone tries to write |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 3316 | * to an uninitialized extent. It may result in splitting the uninitialized |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 3317 | * extent into multiple extents (up to three - one initialized and two |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 3318 | * uninitialized). |
| 3319 | * There are three possibilities: |
| 3320 | * a> There is no split required: Entire extent should be initialized |
| 3321 | * b> Splits in two extents: Write is happening at either end of the extent |
| 3322 | * 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] | 3323 | * |
| 3324 | * Pre-conditions: |
| 3325 | * - The extent pointed to by 'path' is uninitialized. |
| 3326 | * - The extent pointed to by 'path' contains a superset |
| 3327 | * of the logical span [map->m_lblk, map->m_lblk + map->m_len). |
| 3328 | * |
| 3329 | * Post-conditions on success: |
| 3330 | * - the returned value is the number of blocks beyond map->l_lblk |
| 3331 | * that are allocated and initialized. |
| 3332 | * It is guaranteed to be >= map->m_len. |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 3333 | */ |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 3334 | static int ext4_ext_convert_to_initialized(handle_t *handle, |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 3335 | struct inode *inode, |
| 3336 | struct ext4_map_blocks *map, |
Lukas Czerner | 27dd438 | 2013-04-09 22:11:22 -0400 | [diff] [blame] | 3337 | struct ext4_ext_path *path, |
| 3338 | int flags) |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 3339 | { |
Zheng Liu | 67a5da5 | 2012-08-17 09:54:17 -0400 | [diff] [blame] | 3340 | struct ext4_sb_info *sbi; |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3341 | struct ext4_extent_header *eh; |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3342 | struct ext4_map_blocks split_map; |
| 3343 | struct ext4_extent zero_ex; |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3344 | struct ext4_extent *ex, *abut_ex; |
Dmitry Monakhov | 21ca087 | 2010-05-16 06:00:00 -0400 | [diff] [blame] | 3345 | ext4_lblk_t ee_block, eof_block; |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3346 | unsigned int ee_len, depth, map_len = map->m_len; |
| 3347 | int allocated = 0, max_zeroout = 0; |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 3348 | int err = 0; |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3349 | int split_flag = 0; |
Dmitry Monakhov | 21ca087 | 2010-05-16 06:00:00 -0400 | [diff] [blame] | 3350 | |
| 3351 | ext_debug("ext4_ext_convert_to_initialized: inode %lu, logical" |
| 3352 | "block %llu, max_blocks %u\n", inode->i_ino, |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3353 | (unsigned long long)map->m_lblk, map_len); |
Dmitry Monakhov | 21ca087 | 2010-05-16 06:00:00 -0400 | [diff] [blame] | 3354 | |
Zheng Liu | 67a5da5 | 2012-08-17 09:54:17 -0400 | [diff] [blame] | 3355 | sbi = EXT4_SB(inode->i_sb); |
Dmitry Monakhov | 21ca087 | 2010-05-16 06:00:00 -0400 | [diff] [blame] | 3356 | eof_block = (inode->i_size + inode->i_sb->s_blocksize - 1) >> |
| 3357 | inode->i_sb->s_blocksize_bits; |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3358 | if (eof_block < map->m_lblk + map_len) |
| 3359 | eof_block = map->m_lblk + map_len; |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 3360 | |
| 3361 | depth = ext_depth(inode); |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3362 | eh = path[depth].p_hdr; |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 3363 | ex = path[depth].p_ext; |
| 3364 | ee_block = le32_to_cpu(ex->ee_block); |
| 3365 | ee_len = ext4_ext_get_actual_len(ex); |
Zheng Liu | adb2355 | 2013-03-10 21:13:05 -0400 | [diff] [blame] | 3366 | zero_ex.ee_len = 0; |
Dmitry Monakhov | 21ca087 | 2010-05-16 06:00:00 -0400 | [diff] [blame] | 3367 | |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3368 | trace_ext4_ext_convert_to_initialized_enter(inode, map, ex); |
| 3369 | |
| 3370 | /* Pre-conditions */ |
| 3371 | BUG_ON(!ext4_ext_is_uninitialized(ex)); |
| 3372 | BUG_ON(!in_range(map->m_lblk, ee_block, ee_len)); |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3373 | |
| 3374 | /* |
| 3375 | * Attempt to transfer newly initialized blocks from the currently |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3376 | * uninitialized extent to its neighbor. This is much cheaper |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3377 | * than an insertion followed by a merge as those involve costly |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3378 | * memmove() calls. Transferring to the left is the common case in |
| 3379 | * steady state for workloads doing fallocate(FALLOC_FL_KEEP_SIZE) |
| 3380 | * followed by append writes. |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3381 | * |
| 3382 | * Limitations of the current logic: |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3383 | * - L1: we do not deal with writes covering the whole extent. |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3384 | * This would require removing the extent if the transfer |
| 3385 | * is possible. |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3386 | * - L2: we only attempt to merge with an extent stored in the |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3387 | * same extent tree node. |
| 3388 | */ |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3389 | if ((map->m_lblk == ee_block) && |
| 3390 | /* See if we can merge left */ |
| 3391 | (map_len < ee_len) && /*L1*/ |
| 3392 | (ex > EXT_FIRST_EXTENT(eh))) { /*L2*/ |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3393 | ext4_lblk_t prev_lblk; |
| 3394 | ext4_fsblk_t prev_pblk, ee_pblk; |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3395 | unsigned int prev_len; |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3396 | |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3397 | abut_ex = ex - 1; |
| 3398 | prev_lblk = le32_to_cpu(abut_ex->ee_block); |
| 3399 | prev_len = ext4_ext_get_actual_len(abut_ex); |
| 3400 | prev_pblk = ext4_ext_pblock(abut_ex); |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3401 | ee_pblk = ext4_ext_pblock(ex); |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3402 | |
| 3403 | /* |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3404 | * A transfer of blocks from 'ex' to 'abut_ex' is allowed |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3405 | * upon those conditions: |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3406 | * - C1: abut_ex is initialized, |
| 3407 | * - C2: abut_ex is logically abutting ex, |
| 3408 | * - C3: abut_ex is physically abutting ex, |
| 3409 | * - C4: abut_ex can receive the additional blocks without |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3410 | * overflowing the (initialized) length limit. |
| 3411 | */ |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3412 | if ((!ext4_ext_is_uninitialized(abut_ex)) && /*C1*/ |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3413 | ((prev_lblk + prev_len) == ee_block) && /*C2*/ |
| 3414 | ((prev_pblk + prev_len) == ee_pblk) && /*C3*/ |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3415 | (prev_len < (EXT_INIT_MAX_LEN - map_len))) { /*C4*/ |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3416 | err = ext4_ext_get_access(handle, inode, path + depth); |
| 3417 | if (err) |
| 3418 | goto out; |
| 3419 | |
| 3420 | trace_ext4_ext_convert_to_initialized_fastpath(inode, |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3421 | map, ex, abut_ex); |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3422 | |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3423 | /* Shift the start of ex by 'map_len' blocks */ |
| 3424 | ex->ee_block = cpu_to_le32(ee_block + map_len); |
| 3425 | ext4_ext_store_pblock(ex, ee_pblk + map_len); |
| 3426 | ex->ee_len = cpu_to_le16(ee_len - map_len); |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3427 | ext4_ext_mark_uninitialized(ex); /* Restore the flag */ |
| 3428 | |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3429 | /* Extend abut_ex by 'map_len' blocks */ |
| 3430 | abut_ex->ee_len = cpu_to_le16(prev_len + map_len); |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3431 | |
| 3432 | /* Result: number of initialized blocks past m_lblk */ |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3433 | allocated = map_len; |
| 3434 | } |
| 3435 | } else if (((map->m_lblk + map_len) == (ee_block + ee_len)) && |
| 3436 | (map_len < ee_len) && /*L1*/ |
| 3437 | ex < EXT_LAST_EXTENT(eh)) { /*L2*/ |
| 3438 | /* See if we can merge right */ |
| 3439 | ext4_lblk_t next_lblk; |
| 3440 | ext4_fsblk_t next_pblk, ee_pblk; |
| 3441 | unsigned int next_len; |
| 3442 | |
| 3443 | abut_ex = ex + 1; |
| 3444 | next_lblk = le32_to_cpu(abut_ex->ee_block); |
| 3445 | next_len = ext4_ext_get_actual_len(abut_ex); |
| 3446 | next_pblk = ext4_ext_pblock(abut_ex); |
| 3447 | ee_pblk = ext4_ext_pblock(ex); |
| 3448 | |
| 3449 | /* |
| 3450 | * A transfer of blocks from 'ex' to 'abut_ex' is allowed |
| 3451 | * upon those conditions: |
| 3452 | * - C1: abut_ex is initialized, |
| 3453 | * - C2: abut_ex is logically abutting ex, |
| 3454 | * - C3: abut_ex is physically abutting ex, |
| 3455 | * - C4: abut_ex can receive the additional blocks without |
| 3456 | * overflowing the (initialized) length limit. |
| 3457 | */ |
| 3458 | if ((!ext4_ext_is_uninitialized(abut_ex)) && /*C1*/ |
| 3459 | ((map->m_lblk + map_len) == next_lblk) && /*C2*/ |
| 3460 | ((ee_pblk + ee_len) == next_pblk) && /*C3*/ |
| 3461 | (next_len < (EXT_INIT_MAX_LEN - map_len))) { /*C4*/ |
| 3462 | err = ext4_ext_get_access(handle, inode, path + depth); |
| 3463 | if (err) |
| 3464 | goto out; |
| 3465 | |
| 3466 | trace_ext4_ext_convert_to_initialized_fastpath(inode, |
| 3467 | map, ex, abut_ex); |
| 3468 | |
| 3469 | /* Shift the start of abut_ex by 'map_len' blocks */ |
| 3470 | abut_ex->ee_block = cpu_to_le32(next_lblk - map_len); |
| 3471 | ext4_ext_store_pblock(abut_ex, next_pblk - map_len); |
| 3472 | ex->ee_len = cpu_to_le16(ee_len - map_len); |
| 3473 | ext4_ext_mark_uninitialized(ex); /* Restore the flag */ |
| 3474 | |
| 3475 | /* Extend abut_ex by 'map_len' blocks */ |
| 3476 | abut_ex->ee_len = cpu_to_le16(next_len + map_len); |
| 3477 | |
| 3478 | /* Result: number of initialized blocks past m_lblk */ |
| 3479 | allocated = map_len; |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3480 | } |
| 3481 | } |
Lukas Czerner | bc2d9db | 2013-04-03 23:33:27 -0400 | [diff] [blame] | 3482 | if (allocated) { |
| 3483 | /* Mark the block containing both extents as dirty */ |
| 3484 | ext4_ext_dirty(handle, inode, path + depth); |
| 3485 | |
| 3486 | /* Update path to point to the right extent */ |
| 3487 | path[depth].p_ext = abut_ex; |
| 3488 | goto out; |
| 3489 | } else |
| 3490 | allocated = ee_len - (map->m_lblk - ee_block); |
Eric Gouriou | 6f91bc5 | 2011-10-27 11:43:23 -0400 | [diff] [blame] | 3491 | |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3492 | WARN_ON(map->m_lblk < ee_block); |
Dmitry Monakhov | 21ca087 | 2010-05-16 06:00:00 -0400 | [diff] [blame] | 3493 | /* |
| 3494 | * It is safe to convert extent to initialized via explicit |
| 3495 | * zeroout only if extent is fully insde i_size or new_size. |
| 3496 | */ |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3497 | 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] | 3498 | |
Zheng Liu | 67a5da5 | 2012-08-17 09:54:17 -0400 | [diff] [blame] | 3499 | if (EXT4_EXT_MAY_ZEROOUT & split_flag) |
| 3500 | max_zeroout = sbi->s_extent_max_zeroout_kb >> |
Lukas Czerner | 4f42f80 | 2013-03-12 12:40:04 -0400 | [diff] [blame] | 3501 | (inode->i_sb->s_blocksize_bits - 10); |
Zheng Liu | 67a5da5 | 2012-08-17 09:54:17 -0400 | [diff] [blame] | 3502 | |
| 3503 | /* If extent is less than s_max_zeroout_kb, zeroout directly */ |
| 3504 | if (max_zeroout && (ee_len <= max_zeroout)) { |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3505 | err = ext4_ext_zeroout(inode, ex); |
Aneesh Kumar K.V | 3977c96 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 3506 | if (err) |
Aneesh Kumar K.V | d03856b | 2008-08-02 18:51:32 -0400 | [diff] [blame] | 3507 | goto out; |
Zheng Liu | adb2355 | 2013-03-10 21:13:05 -0400 | [diff] [blame] | 3508 | zero_ex.ee_block = ex->ee_block; |
Zheng Liu | 8cde7ad | 2013-04-03 12:27:18 -0400 | [diff] [blame] | 3509 | 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] | 3510 | ext4_ext_store_pblock(&zero_ex, ext4_ext_pblock(ex)); |
Aneesh Kumar K.V | d03856b | 2008-08-02 18:51:32 -0400 | [diff] [blame] | 3511 | |
| 3512 | err = ext4_ext_get_access(handle, inode, path + depth); |
| 3513 | if (err) |
| 3514 | goto out; |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3515 | ext4_ext_mark_initialized(ex); |
Theodore Ts'o | ecb94f5 | 2012-08-17 09:44:17 -0400 | [diff] [blame] | 3516 | ext4_ext_try_to_merge(handle, inode, path, ex); |
| 3517 | err = ext4_ext_dirty(handle, inode, path + path->p_depth); |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3518 | goto out; |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 3519 | } |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3520 | |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 3521 | /* |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3522 | * four cases: |
| 3523 | * 1. split the extent into three extents. |
| 3524 | * 2. split the extent into two extents, zeroout the first half. |
| 3525 | * 3. split the extent into two extents, zeroout the second half. |
| 3526 | * 4. split the extent into two extents with out zeroout. |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 3527 | */ |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3528 | split_map.m_lblk = map->m_lblk; |
| 3529 | split_map.m_len = map->m_len; |
| 3530 | |
Zheng Liu | 67a5da5 | 2012-08-17 09:54:17 -0400 | [diff] [blame] | 3531 | if (max_zeroout && (allocated > map->m_len)) { |
| 3532 | if (allocated <= max_zeroout) { |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3533 | /* case 3 */ |
| 3534 | zero_ex.ee_block = |
Allison Henderson | 9b940f8 | 2011-05-16 10:11:09 -0400 | [diff] [blame] | 3535 | cpu_to_le32(map->m_lblk); |
| 3536 | zero_ex.ee_len = cpu_to_le16(allocated); |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3537 | ext4_ext_store_pblock(&zero_ex, |
| 3538 | ext4_ext_pblock(ex) + map->m_lblk - ee_block); |
| 3539 | err = ext4_ext_zeroout(inode, &zero_ex); |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 3540 | if (err) |
| 3541 | goto out; |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3542 | split_map.m_lblk = map->m_lblk; |
| 3543 | split_map.m_len = allocated; |
Zheng Liu | 67a5da5 | 2012-08-17 09:54:17 -0400 | [diff] [blame] | 3544 | } else if (map->m_lblk - ee_block + map->m_len < max_zeroout) { |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3545 | /* case 2 */ |
| 3546 | if (map->m_lblk != ee_block) { |
| 3547 | zero_ex.ee_block = ex->ee_block; |
| 3548 | zero_ex.ee_len = cpu_to_le16(map->m_lblk - |
| 3549 | ee_block); |
| 3550 | ext4_ext_store_pblock(&zero_ex, |
| 3551 | ext4_ext_pblock(ex)); |
| 3552 | err = ext4_ext_zeroout(inode, &zero_ex); |
| 3553 | if (err) |
| 3554 | goto out; |
| 3555 | } |
| 3556 | |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3557 | split_map.m_lblk = ee_block; |
Allison Henderson | 9b940f8 | 2011-05-16 10:11:09 -0400 | [diff] [blame] | 3558 | split_map.m_len = map->m_lblk - ee_block + map->m_len; |
| 3559 | allocated = map->m_len; |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 3560 | } |
| 3561 | } |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3562 | |
| 3563 | allocated = ext4_split_extent(handle, inode, path, |
Lukas Czerner | 27dd438 | 2013-04-09 22:11:22 -0400 | [diff] [blame] | 3564 | &split_map, split_flag, flags); |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3565 | if (allocated < 0) |
| 3566 | err = allocated; |
| 3567 | |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 3568 | out: |
Zheng Liu | adb2355 | 2013-03-10 21:13:05 -0400 | [diff] [blame] | 3569 | /* If we have gotten a failure, don't zero out status tree */ |
| 3570 | if (!err) |
Zheng Liu | d7b2a00 | 2013-08-28 14:47:06 -0400 | [diff] [blame] | 3571 | err = ext4_zeroout_es(inode, &zero_ex); |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 3572 | return err ? err : allocated; |
| 3573 | } |
| 3574 | |
Aneesh Kumar K.V | c278bfe | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 3575 | /* |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 3576 | * This function is called by ext4_ext_map_blocks() from |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3577 | * ext4_get_blocks_dio_write() when DIO to write |
| 3578 | * to an uninitialized extent. |
| 3579 | * |
Paul Bolle | fd018fe | 2011-02-15 00:05:43 +0100 | [diff] [blame] | 3580 | * Writing to an uninitialized extent may result in splitting the uninitialized |
Wang Sheng-Hui | 30cb27d | 2012-08-18 22:38:07 -0400 | [diff] [blame] | 3581 | * extent into multiple initialized/uninitialized extents (up to three) |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3582 | * There are three possibilities: |
| 3583 | * a> There is no split required: Entire extent should be uninitialized |
| 3584 | * b> Splits in two extents: Write is happening at either end of the extent |
| 3585 | * c> Splits in three extents: Somone is writing in middle of the extent |
| 3586 | * |
| 3587 | * One of more index blocks maybe needed if the extent tree grow after |
Uwe Kleine-König | b595076 | 2010-11-01 15:38:34 -0400 | [diff] [blame] | 3588 | * the uninitialized extent split. To prevent ENOSPC occur at the IO |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3589 | * complete, we need to split the uninitialized extent before DIO submit |
Uwe Kleine-König | 421f91d | 2010-06-11 12:17:00 +0200 | [diff] [blame] | 3590 | * the IO. The uninitialized extent called at this time will be split |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3591 | * into three uninitialized extent(at most). After IO complete, the part |
| 3592 | * being filled will be convert to initialized by the end_io callback function |
| 3593 | * via ext4_convert_unwritten_extents(). |
Mingming | ba230c3 | 2009-11-06 04:01:23 -0500 | [diff] [blame] | 3594 | * |
| 3595 | * Returns the size of uninitialized extent to be written on success. |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3596 | */ |
| 3597 | static int ext4_split_unwritten_extents(handle_t *handle, |
| 3598 | struct inode *inode, |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 3599 | struct ext4_map_blocks *map, |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3600 | struct ext4_ext_path *path, |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3601 | int flags) |
| 3602 | { |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3603 | ext4_lblk_t eof_block; |
| 3604 | ext4_lblk_t ee_block; |
| 3605 | struct ext4_extent *ex; |
| 3606 | unsigned int ee_len; |
| 3607 | int split_flag = 0, depth; |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3608 | |
Dmitry Monakhov | 21ca087 | 2010-05-16 06:00:00 -0400 | [diff] [blame] | 3609 | ext_debug("ext4_split_unwritten_extents: inode %lu, logical" |
| 3610 | "block %llu, max_blocks %u\n", inode->i_ino, |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 3611 | (unsigned long long)map->m_lblk, map->m_len); |
Dmitry Monakhov | 21ca087 | 2010-05-16 06:00:00 -0400 | [diff] [blame] | 3612 | |
| 3613 | eof_block = (inode->i_size + inode->i_sb->s_blocksize - 1) >> |
| 3614 | inode->i_sb->s_blocksize_bits; |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 3615 | if (eof_block < map->m_lblk + map->m_len) |
| 3616 | eof_block = map->m_lblk + map->m_len; |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3617 | /* |
Dmitry Monakhov | 21ca087 | 2010-05-16 06:00:00 -0400 | [diff] [blame] | 3618 | * It is safe to convert extent to initialized via explicit |
| 3619 | * zeroout only if extent is fully insde i_size or new_size. |
| 3620 | */ |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3621 | depth = ext_depth(inode); |
| 3622 | ex = path[depth].p_ext; |
| 3623 | ee_block = le32_to_cpu(ex->ee_block); |
| 3624 | ee_len = ext4_ext_get_actual_len(ex); |
Dmitry Monakhov | 21ca087 | 2010-05-16 06:00:00 -0400 | [diff] [blame] | 3625 | |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3626 | split_flag |= ee_block + ee_len <= eof_block ? EXT4_EXT_MAY_ZEROOUT : 0; |
| 3627 | split_flag |= EXT4_EXT_MARK_UNINIT2; |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3628 | if (flags & EXT4_GET_BLOCKS_CONVERT) |
| 3629 | split_flag |= EXT4_EXT_DATA_VALID2; |
Yongqiang Yang | 667eff3 | 2011-05-03 12:25:07 -0400 | [diff] [blame] | 3630 | flags |= EXT4_GET_BLOCKS_PRE_IO; |
| 3631 | return ext4_split_extent(handle, inode, path, map, split_flag, flags); |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3632 | } |
Yongqiang Yang | 197217a | 2011-05-03 11:45:29 -0400 | [diff] [blame] | 3633 | |
Jiaying Zhang | c7064ef | 2010-03-02 13:28:44 -0500 | [diff] [blame] | 3634 | static int ext4_convert_unwritten_extents_endio(handle_t *handle, |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3635 | struct inode *inode, |
| 3636 | struct ext4_map_blocks *map, |
| 3637 | struct ext4_ext_path *path) |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3638 | { |
| 3639 | struct ext4_extent *ex; |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3640 | ext4_lblk_t ee_block; |
| 3641 | unsigned int ee_len; |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3642 | int depth; |
| 3643 | int err = 0; |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3644 | |
| 3645 | depth = ext_depth(inode); |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3646 | ex = path[depth].p_ext; |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3647 | ee_block = le32_to_cpu(ex->ee_block); |
| 3648 | ee_len = ext4_ext_get_actual_len(ex); |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3649 | |
Yongqiang Yang | 197217a | 2011-05-03 11:45:29 -0400 | [diff] [blame] | 3650 | ext_debug("ext4_convert_unwritten_extents_endio: inode %lu, logical" |
| 3651 | "block %llu, max_blocks %u\n", inode->i_ino, |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3652 | (unsigned long long)ee_block, ee_len); |
| 3653 | |
Dmitry Monakhov | ff95ec2 | 2013-03-04 00:41:05 -0500 | [diff] [blame] | 3654 | /* If extent is larger than requested it is a clear sign that we still |
| 3655 | * have some extent state machine issues left. So extent_split is still |
| 3656 | * required. |
| 3657 | * TODO: Once all related issues will be fixed this situation should be |
| 3658 | * illegal. |
| 3659 | */ |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3660 | if (ee_block != map->m_lblk || ee_len > map->m_len) { |
Dmitry Monakhov | ff95ec2 | 2013-03-04 00:41:05 -0500 | [diff] [blame] | 3661 | #ifdef EXT4_DEBUG |
| 3662 | ext4_warning("Inode (%ld) finished: extent logical block %llu," |
| 3663 | " len %u; IO logical block %llu, len %u\n", |
| 3664 | inode->i_ino, (unsigned long long)ee_block, ee_len, |
| 3665 | (unsigned long long)map->m_lblk, map->m_len); |
| 3666 | #endif |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3667 | err = ext4_split_unwritten_extents(handle, inode, map, path, |
| 3668 | EXT4_GET_BLOCKS_CONVERT); |
| 3669 | if (err < 0) |
| 3670 | goto out; |
| 3671 | ext4_ext_drop_refs(path); |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 3672 | path = ext4_ext_find_extent(inode, map->m_lblk, path, 0); |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3673 | if (IS_ERR(path)) { |
| 3674 | err = PTR_ERR(path); |
| 3675 | goto out; |
| 3676 | } |
| 3677 | depth = ext_depth(inode); |
| 3678 | ex = path[depth].p_ext; |
| 3679 | } |
Yongqiang Yang | 197217a | 2011-05-03 11:45:29 -0400 | [diff] [blame] | 3680 | |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3681 | err = ext4_ext_get_access(handle, inode, path + depth); |
| 3682 | if (err) |
| 3683 | goto out; |
| 3684 | /* first mark the extent as initialized */ |
| 3685 | ext4_ext_mark_initialized(ex); |
| 3686 | |
Yongqiang Yang | 197217a | 2011-05-03 11:45:29 -0400 | [diff] [blame] | 3687 | /* note: ext4_ext_correct_indexes() isn't needed here because |
| 3688 | * borders are not changed |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3689 | */ |
Theodore Ts'o | ecb94f5 | 2012-08-17 09:44:17 -0400 | [diff] [blame] | 3690 | ext4_ext_try_to_merge(handle, inode, path, ex); |
Yongqiang Yang | 197217a | 2011-05-03 11:45:29 -0400 | [diff] [blame] | 3691 | |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3692 | /* Mark modified extent as dirty */ |
Theodore Ts'o | ecb94f5 | 2012-08-17 09:44:17 -0400 | [diff] [blame] | 3693 | err = ext4_ext_dirty(handle, inode, path + path->p_depth); |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3694 | out: |
| 3695 | ext4_ext_show_leaf(inode, path); |
| 3696 | return err; |
| 3697 | } |
| 3698 | |
Aneesh Kumar K.V | 515f41c | 2009-12-29 23:39:06 -0500 | [diff] [blame] | 3699 | static void unmap_underlying_metadata_blocks(struct block_device *bdev, |
| 3700 | sector_t block, int count) |
| 3701 | { |
| 3702 | int i; |
| 3703 | for (i = 0; i < count; i++) |
| 3704 | unmap_underlying_metadata(bdev, block + i); |
| 3705 | } |
| 3706 | |
Theodore Ts'o | 58590b0 | 2010-10-27 21:23:12 -0400 | [diff] [blame] | 3707 | /* |
| 3708 | * Handle EOFBLOCKS_FL flag, clearing it if necessary |
| 3709 | */ |
| 3710 | static int check_eofblocks_fl(handle_t *handle, struct inode *inode, |
Eric Sandeen | d002ebf | 2011-01-10 13:03:35 -0500 | [diff] [blame] | 3711 | ext4_lblk_t lblk, |
Theodore Ts'o | 58590b0 | 2010-10-27 21:23:12 -0400 | [diff] [blame] | 3712 | struct ext4_ext_path *path, |
| 3713 | unsigned int len) |
| 3714 | { |
| 3715 | int i, depth; |
| 3716 | struct ext4_extent_header *eh; |
Sergey Senozhatsky | 65922cb | 2011-03-23 14:08:27 -0400 | [diff] [blame] | 3717 | struct ext4_extent *last_ex; |
Theodore Ts'o | 58590b0 | 2010-10-27 21:23:12 -0400 | [diff] [blame] | 3718 | |
| 3719 | if (!ext4_test_inode_flag(inode, EXT4_INODE_EOFBLOCKS)) |
| 3720 | return 0; |
| 3721 | |
| 3722 | depth = ext_depth(inode); |
| 3723 | eh = path[depth].p_hdr; |
Theodore Ts'o | 58590b0 | 2010-10-27 21:23:12 -0400 | [diff] [blame] | 3724 | |
Lukas Czerner | afcff5d | 2012-03-21 21:47:55 -0400 | [diff] [blame] | 3725 | /* |
| 3726 | * We're going to remove EOFBLOCKS_FL entirely in future so we |
| 3727 | * do not care for this case anymore. Simply remove the flag |
| 3728 | * if there are no extents. |
| 3729 | */ |
| 3730 | if (unlikely(!eh->eh_entries)) |
| 3731 | goto out; |
Theodore Ts'o | 58590b0 | 2010-10-27 21:23:12 -0400 | [diff] [blame] | 3732 | last_ex = EXT_LAST_EXTENT(eh); |
| 3733 | /* |
| 3734 | * We should clear the EOFBLOCKS_FL flag if we are writing the |
| 3735 | * last block in the last extent in the file. We test this by |
| 3736 | * first checking to see if the caller to |
| 3737 | * ext4_ext_get_blocks() was interested in the last block (or |
| 3738 | * a block beyond the last block) in the current extent. If |
| 3739 | * this turns out to be false, we can bail out from this |
| 3740 | * function immediately. |
| 3741 | */ |
Eric Sandeen | d002ebf | 2011-01-10 13:03:35 -0500 | [diff] [blame] | 3742 | if (lblk + len < le32_to_cpu(last_ex->ee_block) + |
Theodore Ts'o | 58590b0 | 2010-10-27 21:23:12 -0400 | [diff] [blame] | 3743 | ext4_ext_get_actual_len(last_ex)) |
| 3744 | return 0; |
| 3745 | /* |
| 3746 | * If the caller does appear to be planning to write at or |
| 3747 | * beyond the end of the current extent, we then test to see |
| 3748 | * if the current extent is the last extent in the file, by |
| 3749 | * checking to make sure it was reached via the rightmost node |
| 3750 | * at each level of the tree. |
| 3751 | */ |
| 3752 | for (i = depth-1; i >= 0; i--) |
| 3753 | if (path[i].p_idx != EXT_LAST_INDEX(path[i].p_hdr)) |
| 3754 | return 0; |
Lukas Czerner | afcff5d | 2012-03-21 21:47:55 -0400 | [diff] [blame] | 3755 | out: |
Theodore Ts'o | 58590b0 | 2010-10-27 21:23:12 -0400 | [diff] [blame] | 3756 | ext4_clear_inode_flag(inode, EXT4_INODE_EOFBLOCKS); |
| 3757 | return ext4_mark_inode_dirty(handle, inode); |
| 3758 | } |
| 3759 | |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 3760 | /** |
| 3761 | * ext4_find_delalloc_range: find delayed allocated block in the given range. |
| 3762 | * |
Zheng Liu | 7d1b1fb | 2012-11-08 21:57:35 -0500 | [diff] [blame] | 3763 | * 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] | 3764 | */ |
Zheng Liu | f7fec03 | 2013-02-18 00:28:47 -0500 | [diff] [blame] | 3765 | int ext4_find_delalloc_range(struct inode *inode, |
| 3766 | ext4_lblk_t lblk_start, |
| 3767 | ext4_lblk_t lblk_end) |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 3768 | { |
Zheng Liu | 7d1b1fb | 2012-11-08 21:57:35 -0500 | [diff] [blame] | 3769 | struct extent_status es; |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 3770 | |
Yan, Zheng | e30b5dc | 2013-05-03 02:15:52 -0400 | [diff] [blame] | 3771 | ext4_es_find_delayed_extent_range(inode, lblk_start, lblk_end, &es); |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 3772 | if (es.es_len == 0) |
Zheng Liu | 7d1b1fb | 2012-11-08 21:57:35 -0500 | [diff] [blame] | 3773 | return 0; /* there is no delay extent in this tree */ |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 3774 | else if (es.es_lblk <= lblk_start && |
| 3775 | lblk_start < es.es_lblk + es.es_len) |
Zheng Liu | 7d1b1fb | 2012-11-08 21:57:35 -0500 | [diff] [blame] | 3776 | return 1; |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 3777 | else if (lblk_start <= es.es_lblk && es.es_lblk <= lblk_end) |
Zheng Liu | 7d1b1fb | 2012-11-08 21:57:35 -0500 | [diff] [blame] | 3778 | return 1; |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 3779 | else |
Zheng Liu | 7d1b1fb | 2012-11-08 21:57:35 -0500 | [diff] [blame] | 3780 | return 0; |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 3781 | } |
| 3782 | |
Zheng Liu | 7d1b1fb | 2012-11-08 21:57:35 -0500 | [diff] [blame] | 3783 | int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk) |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 3784 | { |
| 3785 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
| 3786 | ext4_lblk_t lblk_start, lblk_end; |
| 3787 | lblk_start = lblk & (~(sbi->s_cluster_ratio - 1)); |
| 3788 | lblk_end = lblk_start + sbi->s_cluster_ratio - 1; |
| 3789 | |
Zheng Liu | 7d1b1fb | 2012-11-08 21:57:35 -0500 | [diff] [blame] | 3790 | return ext4_find_delalloc_range(inode, lblk_start, lblk_end); |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 3791 | } |
| 3792 | |
| 3793 | /** |
| 3794 | * Determines how many complete clusters (out of those specified by the 'map') |
| 3795 | * are under delalloc and were reserved quota for. |
| 3796 | * This function is called when we are writing out the blocks that were |
| 3797 | * originally written with their allocation delayed, but then the space was |
| 3798 | * allocated using fallocate() before the delayed allocation could be resolved. |
| 3799 | * The cases to look for are: |
| 3800 | * ('=' indicated delayed allocated blocks |
| 3801 | * '-' indicates non-delayed allocated blocks) |
| 3802 | * (a) partial clusters towards beginning and/or end outside of allocated range |
| 3803 | * are not delalloc'ed. |
| 3804 | * Ex: |
| 3805 | * |----c---=|====c====|====c====|===-c----| |
| 3806 | * |++++++ allocated ++++++| |
| 3807 | * ==> 4 complete clusters in above example |
| 3808 | * |
| 3809 | * (b) partial cluster (outside of allocated range) towards either end is |
| 3810 | * marked for delayed allocation. In this case, we will exclude that |
| 3811 | * cluster. |
| 3812 | * Ex: |
| 3813 | * |----====c========|========c========| |
| 3814 | * |++++++ allocated ++++++| |
| 3815 | * ==> 1 complete clusters in above example |
| 3816 | * |
| 3817 | * Ex: |
| 3818 | * |================c================| |
| 3819 | * |++++++ allocated ++++++| |
| 3820 | * ==> 0 complete clusters in above example |
| 3821 | * |
| 3822 | * The ext4_da_update_reserve_space will be called only if we |
| 3823 | * determine here that there were some "entire" clusters that span |
| 3824 | * this 'allocated' range. |
| 3825 | * In the non-bigalloc case, this function will just end up returning num_blks |
| 3826 | * without ever calling ext4_find_delalloc_range. |
| 3827 | */ |
| 3828 | static unsigned int |
| 3829 | get_reserved_cluster_alloc(struct inode *inode, ext4_lblk_t lblk_start, |
| 3830 | unsigned int num_blks) |
| 3831 | { |
| 3832 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
| 3833 | ext4_lblk_t alloc_cluster_start, alloc_cluster_end; |
| 3834 | ext4_lblk_t lblk_from, lblk_to, c_offset; |
| 3835 | unsigned int allocated_clusters = 0; |
| 3836 | |
| 3837 | alloc_cluster_start = EXT4_B2C(sbi, lblk_start); |
| 3838 | alloc_cluster_end = EXT4_B2C(sbi, lblk_start + num_blks - 1); |
| 3839 | |
| 3840 | /* max possible clusters for this allocation */ |
| 3841 | allocated_clusters = alloc_cluster_end - alloc_cluster_start + 1; |
| 3842 | |
Aditya Kali | d899024 | 2011-09-09 19:18:51 -0400 | [diff] [blame] | 3843 | trace_ext4_get_reserved_cluster_alloc(inode, lblk_start, num_blks); |
| 3844 | |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 3845 | /* Check towards left side */ |
| 3846 | c_offset = lblk_start & (sbi->s_cluster_ratio - 1); |
| 3847 | if (c_offset) { |
| 3848 | lblk_from = lblk_start & (~(sbi->s_cluster_ratio - 1)); |
| 3849 | lblk_to = lblk_from + c_offset - 1; |
| 3850 | |
Zheng Liu | 7d1b1fb | 2012-11-08 21:57:35 -0500 | [diff] [blame] | 3851 | if (ext4_find_delalloc_range(inode, lblk_from, lblk_to)) |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 3852 | allocated_clusters--; |
| 3853 | } |
| 3854 | |
| 3855 | /* Now check towards right. */ |
| 3856 | c_offset = (lblk_start + num_blks) & (sbi->s_cluster_ratio - 1); |
| 3857 | if (allocated_clusters && c_offset) { |
| 3858 | lblk_from = lblk_start + num_blks; |
| 3859 | lblk_to = lblk_from + (sbi->s_cluster_ratio - c_offset) - 1; |
| 3860 | |
Zheng Liu | 7d1b1fb | 2012-11-08 21:57:35 -0500 | [diff] [blame] | 3861 | if (ext4_find_delalloc_range(inode, lblk_from, lblk_to)) |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 3862 | allocated_clusters--; |
| 3863 | } |
| 3864 | |
| 3865 | return allocated_clusters; |
| 3866 | } |
| 3867 | |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3868 | static int |
| 3869 | ext4_ext_handle_uninitialized_extents(handle_t *handle, struct inode *inode, |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 3870 | struct ext4_map_blocks *map, |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3871 | struct ext4_ext_path *path, int flags, |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 3872 | unsigned int allocated, ext4_fsblk_t newblock) |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3873 | { |
| 3874 | int ret = 0; |
| 3875 | int err = 0; |
Dmitry Monakhov | f45ee3a | 2012-09-28 23:21:09 -0400 | [diff] [blame] | 3876 | ext4_io_end_t *io = ext4_inode_aio(inode); |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3877 | |
Zheng Liu | 88635ca | 2011-12-28 19:00:25 -0500 | [diff] [blame] | 3878 | ext_debug("ext4_ext_handle_uninitialized_extents: inode %lu, logical " |
| 3879 | "block %llu, max_blocks %u, flags %x, allocated %u\n", |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 3880 | inode->i_ino, (unsigned long long)map->m_lblk, map->m_len, |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3881 | flags, allocated); |
| 3882 | ext4_ext_show_leaf(inode, path); |
| 3883 | |
Lukas Czerner | 27dd438 | 2013-04-09 22:11:22 -0400 | [diff] [blame] | 3884 | /* |
| 3885 | * When writing into uninitialized space, we should not fail to |
| 3886 | * allocate metadata blocks for the new extent block if needed. |
| 3887 | */ |
| 3888 | flags |= EXT4_GET_BLOCKS_METADATA_NOFAIL; |
| 3889 | |
Zheng Liu | b564553 | 2012-11-08 14:33:43 -0500 | [diff] [blame] | 3890 | trace_ext4_ext_handle_uninitialized_extents(inode, map, flags, |
| 3891 | allocated, newblock); |
Aditya Kali | d899024 | 2011-09-09 19:18:51 -0400 | [diff] [blame] | 3892 | |
Jiaying Zhang | c7064ef | 2010-03-02 13:28:44 -0500 | [diff] [blame] | 3893 | /* get_block() before submit the IO, split the extent */ |
Jiaying Zhang | 744692d | 2010-03-04 16:14:02 -0500 | [diff] [blame] | 3894 | if ((flags & EXT4_GET_BLOCKS_PRE_IO)) { |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 3895 | ret = ext4_split_unwritten_extents(handle, inode, map, |
| 3896 | path, flags); |
Dmitry Monakhov | 82e5422 | 2012-09-28 23:36:25 -0400 | [diff] [blame] | 3897 | if (ret <= 0) |
| 3898 | goto out; |
Mingming | 5f52495 | 2009-11-10 10:48:04 -0500 | [diff] [blame] | 3899 | /* |
| 3900 | * 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] | 3901 | * that this IO needs to conversion to written when IO is |
Mingming | 5f52495 | 2009-11-10 10:48:04 -0500 | [diff] [blame] | 3902 | * completed |
| 3903 | */ |
Tao Ma | 0edeb71 | 2011-10-31 17:30:44 -0400 | [diff] [blame] | 3904 | if (io) |
| 3905 | ext4_set_io_unwritten_flag(inode, io); |
| 3906 | else |
Theodore Ts'o | 19f5fb7 | 2010-01-24 14:34:07 -0500 | [diff] [blame] | 3907 | ext4_set_inode_state(inode, EXT4_STATE_DIO_UNWRITTEN); |
Zheng Liu | a25a4e1 | 2013-02-18 00:28:04 -0500 | [diff] [blame] | 3908 | map->m_flags |= EXT4_MAP_UNWRITTEN; |
Jiaying Zhang | 744692d | 2010-03-04 16:14:02 -0500 | [diff] [blame] | 3909 | if (ext4_should_dioread_nolock(inode)) |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 3910 | map->m_flags |= EXT4_MAP_UNINIT; |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3911 | goto out; |
| 3912 | } |
Jiaying Zhang | c7064ef | 2010-03-02 13:28:44 -0500 | [diff] [blame] | 3913 | /* IO end_io complete, convert the filled extent to written */ |
Jiaying Zhang | 744692d | 2010-03-04 16:14:02 -0500 | [diff] [blame] | 3914 | if ((flags & EXT4_GET_BLOCKS_CONVERT)) { |
Dmitry Monakhov | dee1f97 | 2012-10-10 01:04:58 -0400 | [diff] [blame] | 3915 | ret = ext4_convert_unwritten_extents_endio(handle, inode, map, |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3916 | path); |
Theodore Ts'o | 58590b0 | 2010-10-27 21:23:12 -0400 | [diff] [blame] | 3917 | if (ret >= 0) { |
Jan Kara | b436b9b | 2009-12-08 23:51:10 -0500 | [diff] [blame] | 3918 | ext4_update_inode_fsync_trans(handle, inode, 1); |
Eric Sandeen | d002ebf | 2011-01-10 13:03:35 -0500 | [diff] [blame] | 3919 | err = check_eofblocks_fl(handle, inode, map->m_lblk, |
| 3920 | path, map->m_len); |
Theodore Ts'o | 58590b0 | 2010-10-27 21:23:12 -0400 | [diff] [blame] | 3921 | } else |
| 3922 | err = ret; |
Zheng Liu | cdee784 | 2013-03-10 21:08:52 -0400 | [diff] [blame] | 3923 | map->m_flags |= EXT4_MAP_MAPPED; |
| 3924 | if (allocated > map->m_len) |
| 3925 | allocated = map->m_len; |
| 3926 | map->m_len = allocated; |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3927 | goto out2; |
| 3928 | } |
| 3929 | /* buffered IO case */ |
| 3930 | /* |
| 3931 | * repeat fallocate creation request |
| 3932 | * we already have an unwritten extent |
| 3933 | */ |
Zheng Liu | a25a4e1 | 2013-02-18 00:28:04 -0500 | [diff] [blame] | 3934 | if (flags & EXT4_GET_BLOCKS_UNINIT_EXT) { |
| 3935 | map->m_flags |= EXT4_MAP_UNWRITTEN; |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3936 | goto map_out; |
Zheng Liu | a25a4e1 | 2013-02-18 00:28:04 -0500 | [diff] [blame] | 3937 | } |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3938 | |
| 3939 | /* buffered READ or buffered write_begin() lookup */ |
| 3940 | if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) { |
| 3941 | /* |
| 3942 | * We have blocks reserved already. We |
| 3943 | * return allocated blocks so that delalloc |
| 3944 | * won't do block reservation for us. But |
| 3945 | * the buffer head will be unmapped so that |
| 3946 | * a read from the block returns 0s. |
| 3947 | */ |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 3948 | map->m_flags |= EXT4_MAP_UNWRITTEN; |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3949 | goto out1; |
| 3950 | } |
| 3951 | |
| 3952 | /* buffered write, writepage time, convert*/ |
Lukas Czerner | 27dd438 | 2013-04-09 22:11:22 -0400 | [diff] [blame] | 3953 | ret = ext4_ext_convert_to_initialized(handle, inode, map, path, flags); |
Dmitry Monakhov | a4e5d88 | 2011-10-25 08:15:12 -0400 | [diff] [blame] | 3954 | if (ret >= 0) |
Jan Kara | b436b9b | 2009-12-08 23:51:10 -0500 | [diff] [blame] | 3955 | ext4_update_inode_fsync_trans(handle, inode, 1); |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3956 | out: |
| 3957 | if (ret <= 0) { |
| 3958 | err = ret; |
| 3959 | goto out2; |
| 3960 | } else |
| 3961 | allocated = ret; |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 3962 | map->m_flags |= EXT4_MAP_NEW; |
Aneesh Kumar K.V | 515f41c | 2009-12-29 23:39:06 -0500 | [diff] [blame] | 3963 | /* |
| 3964 | * if we allocated more blocks than requested |
| 3965 | * we need to make sure we unmap the extra block |
| 3966 | * allocated. The actual needed block will get |
| 3967 | * unmapped later when we find the buffer_head marked |
| 3968 | * new. |
| 3969 | */ |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 3970 | if (allocated > map->m_len) { |
Aneesh Kumar K.V | 515f41c | 2009-12-29 23:39:06 -0500 | [diff] [blame] | 3971 | unmap_underlying_metadata_blocks(inode->i_sb->s_bdev, |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 3972 | newblock + map->m_len, |
| 3973 | allocated - map->m_len); |
| 3974 | allocated = map->m_len; |
Aneesh Kumar K.V | 515f41c | 2009-12-29 23:39:06 -0500 | [diff] [blame] | 3975 | } |
Zheng Liu | 3a22567 | 2013-03-10 21:20:23 -0400 | [diff] [blame] | 3976 | map->m_len = allocated; |
Aneesh Kumar K.V | 5f634d0 | 2010-01-25 04:00:31 -0500 | [diff] [blame] | 3977 | |
| 3978 | /* |
| 3979 | * If we have done fallocate with the offset that is already |
| 3980 | * delayed allocated, we would have block reservation |
| 3981 | * and quota reservation done in the delayed write path. |
| 3982 | * But fallocate would have already updated quota and block |
| 3983 | * count for this offset. So cancel these reservation |
| 3984 | */ |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 3985 | if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) { |
| 3986 | unsigned int reserved_clusters; |
| 3987 | reserved_clusters = get_reserved_cluster_alloc(inode, |
| 3988 | map->m_lblk, map->m_len); |
| 3989 | if (reserved_clusters) |
| 3990 | ext4_da_update_reserve_space(inode, |
| 3991 | reserved_clusters, |
| 3992 | 0); |
| 3993 | } |
Aneesh Kumar K.V | 5f634d0 | 2010-01-25 04:00:31 -0500 | [diff] [blame] | 3994 | |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 3995 | map_out: |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 3996 | map->m_flags |= EXT4_MAP_MAPPED; |
Dmitry Monakhov | a4e5d88 | 2011-10-25 08:15:12 -0400 | [diff] [blame] | 3997 | if ((flags & EXT4_GET_BLOCKS_KEEP_SIZE) == 0) { |
| 3998 | err = check_eofblocks_fl(handle, inode, map->m_lblk, path, |
| 3999 | map->m_len); |
| 4000 | if (err < 0) |
| 4001 | goto out2; |
| 4002 | } |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4003 | out1: |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4004 | if (allocated > map->m_len) |
| 4005 | allocated = map->m_len; |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4006 | ext4_ext_show_leaf(inode, path); |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4007 | map->m_pblk = newblock; |
| 4008 | map->m_len = allocated; |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4009 | out2: |
| 4010 | if (path) { |
| 4011 | ext4_ext_drop_refs(path); |
| 4012 | kfree(path); |
| 4013 | } |
| 4014 | return err ? err : allocated; |
| 4015 | } |
Theodore Ts'o | 58590b0 | 2010-10-27 21:23:12 -0400 | [diff] [blame] | 4016 | |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4017 | /* |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4018 | * get_implied_cluster_alloc - check to see if the requested |
| 4019 | * allocation (in the map structure) overlaps with a cluster already |
| 4020 | * allocated in an extent. |
Aditya Kali | d899024 | 2011-09-09 19:18:51 -0400 | [diff] [blame] | 4021 | * @sb The filesystem superblock structure |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4022 | * @map The requested lblk->pblk mapping |
| 4023 | * @ex The extent structure which might contain an implied |
| 4024 | * cluster allocation |
| 4025 | * |
| 4026 | * This function is called by ext4_ext_map_blocks() after we failed to |
| 4027 | * find blocks that were already in the inode's extent tree. Hence, |
| 4028 | * we know that the beginning of the requested region cannot overlap |
| 4029 | * the extent from the inode's extent tree. There are three cases we |
| 4030 | * want to catch. The first is this case: |
| 4031 | * |
| 4032 | * |--- cluster # N--| |
| 4033 | * |--- extent ---| |---- requested region ---| |
| 4034 | * |==========| |
| 4035 | * |
| 4036 | * The second case that we need to test for is this one: |
| 4037 | * |
| 4038 | * |--------- cluster # N ----------------| |
| 4039 | * |--- requested region --| |------- extent ----| |
| 4040 | * |=======================| |
| 4041 | * |
| 4042 | * The third case is when the requested region lies between two extents |
| 4043 | * within the same cluster: |
| 4044 | * |------------- cluster # N-------------| |
| 4045 | * |----- ex -----| |---- ex_right ----| |
| 4046 | * |------ requested region ------| |
| 4047 | * |================| |
| 4048 | * |
| 4049 | * In each of the above cases, we need to set the map->m_pblk and |
| 4050 | * map->m_len so it corresponds to the return the extent labelled as |
| 4051 | * "|====|" from cluster #N, since it is already in use for data in |
| 4052 | * cluster EXT4_B2C(sbi, map->m_lblk). We will then return 1 to |
| 4053 | * signal to ext4_ext_map_blocks() that map->m_pblk should be treated |
| 4054 | * as a new "allocated" block region. Otherwise, we will return 0 and |
| 4055 | * ext4_ext_map_blocks() will then allocate one or more new clusters |
| 4056 | * by calling ext4_mb_new_blocks(). |
| 4057 | */ |
Aditya Kali | d899024 | 2011-09-09 19:18:51 -0400 | [diff] [blame] | 4058 | static int get_implied_cluster_alloc(struct super_block *sb, |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4059 | struct ext4_map_blocks *map, |
| 4060 | struct ext4_extent *ex, |
| 4061 | struct ext4_ext_path *path) |
| 4062 | { |
Aditya Kali | d899024 | 2011-09-09 19:18:51 -0400 | [diff] [blame] | 4063 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4064 | ext4_lblk_t c_offset = map->m_lblk & (sbi->s_cluster_ratio-1); |
| 4065 | ext4_lblk_t ex_cluster_start, ex_cluster_end; |
Curt Wohlgemuth | 14d7f3e | 2011-12-18 17:39:02 -0500 | [diff] [blame] | 4066 | ext4_lblk_t rr_cluster_start; |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4067 | ext4_lblk_t ee_block = le32_to_cpu(ex->ee_block); |
| 4068 | ext4_fsblk_t ee_start = ext4_ext_pblock(ex); |
| 4069 | unsigned short ee_len = ext4_ext_get_actual_len(ex); |
| 4070 | |
| 4071 | /* The extent passed in that we are trying to match */ |
| 4072 | ex_cluster_start = EXT4_B2C(sbi, ee_block); |
| 4073 | ex_cluster_end = EXT4_B2C(sbi, ee_block + ee_len - 1); |
| 4074 | |
| 4075 | /* The requested region passed into ext4_map_blocks() */ |
| 4076 | rr_cluster_start = EXT4_B2C(sbi, map->m_lblk); |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4077 | |
| 4078 | if ((rr_cluster_start == ex_cluster_end) || |
| 4079 | (rr_cluster_start == ex_cluster_start)) { |
| 4080 | if (rr_cluster_start == ex_cluster_end) |
| 4081 | ee_start += ee_len - 1; |
| 4082 | map->m_pblk = (ee_start & ~(sbi->s_cluster_ratio - 1)) + |
| 4083 | c_offset; |
| 4084 | map->m_len = min(map->m_len, |
| 4085 | (unsigned) sbi->s_cluster_ratio - c_offset); |
| 4086 | /* |
| 4087 | * Check for and handle this case: |
| 4088 | * |
| 4089 | * |--------- cluster # N-------------| |
| 4090 | * |------- extent ----| |
| 4091 | * |--- requested region ---| |
| 4092 | * |===========| |
| 4093 | */ |
| 4094 | |
| 4095 | if (map->m_lblk < ee_block) |
| 4096 | map->m_len = min(map->m_len, ee_block - map->m_lblk); |
| 4097 | |
| 4098 | /* |
| 4099 | * Check for the case where there is already another allocated |
| 4100 | * block to the right of 'ex' but before the end of the cluster. |
| 4101 | * |
| 4102 | * |------------- cluster # N-------------| |
| 4103 | * |----- ex -----| |---- ex_right ----| |
| 4104 | * |------ requested region ------| |
| 4105 | * |================| |
| 4106 | */ |
| 4107 | if (map->m_lblk > ee_block) { |
| 4108 | ext4_lblk_t next = ext4_ext_next_allocated_block(path); |
| 4109 | map->m_len = min(map->m_len, next - map->m_lblk); |
| 4110 | } |
Aditya Kali | d899024 | 2011-09-09 19:18:51 -0400 | [diff] [blame] | 4111 | |
| 4112 | trace_ext4_get_implied_cluster_alloc_exit(sb, map, 1); |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4113 | return 1; |
| 4114 | } |
Aditya Kali | d899024 | 2011-09-09 19:18:51 -0400 | [diff] [blame] | 4115 | |
| 4116 | trace_ext4_get_implied_cluster_alloc_exit(sb, map, 0); |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4117 | return 0; |
| 4118 | } |
| 4119 | |
| 4120 | |
| 4121 | /* |
Mingming Cao | f5ab0d1 | 2008-02-25 15:29:55 -0500 | [diff] [blame] | 4122 | * Block allocation/map/preallocation routine for extents based files |
| 4123 | * |
| 4124 | * |
Aneesh Kumar K.V | c278bfe | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 4125 | * Need to be called with |
Aneesh Kumar K.V | 0e855ac | 2008-01-28 23:58:26 -0500 | [diff] [blame] | 4126 | * down_read(&EXT4_I(inode)->i_data_sem) if not allocating file system block |
| 4127 | * (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] | 4128 | * |
| 4129 | * return > 0, number of of blocks already mapped/allocated |
| 4130 | * if create == 0 and these are pre-allocated blocks |
| 4131 | * buffer head is unmapped |
| 4132 | * otherwise blocks are mapped |
| 4133 | * |
| 4134 | * return = 0, if plain look up failed (blocks have not been allocated) |
| 4135 | * buffer head is unmapped |
| 4136 | * |
| 4137 | * return < 0, error case. |
Aneesh Kumar K.V | c278bfe | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 4138 | */ |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4139 | int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, |
| 4140 | struct ext4_map_blocks *map, int flags) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4141 | { |
| 4142 | struct ext4_ext_path *path = NULL; |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4143 | struct ext4_extent newex, *ex, *ex2; |
| 4144 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
Jiaying Zhang | 0562e0b | 2011-03-21 21:38:05 -0400 | [diff] [blame] | 4145 | ext4_fsblk_t newblock = 0; |
Zheng Liu | 3779473 | 2012-11-08 14:47:52 -0500 | [diff] [blame] | 4146 | int free_on_err = 0, err = 0, depth; |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4147 | unsigned int allocated = 0, offset = 0; |
Yongqiang Yang | 81fdbb4 | 2011-10-29 09:23:38 -0400 | [diff] [blame] | 4148 | unsigned int allocated_clusters = 0; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4149 | struct ext4_allocation_request ar; |
Dmitry Monakhov | f45ee3a | 2012-09-28 23:21:09 -0400 | [diff] [blame] | 4150 | ext4_io_end_t *io = ext4_inode_aio(inode); |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4151 | ext4_lblk_t cluster_offset; |
Dmitry Monakhov | 82e5422 | 2012-09-28 23:36:25 -0400 | [diff] [blame] | 4152 | int set_unwritten = 0; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4153 | |
Mingming | 84fe3be | 2009-09-01 08:44:37 -0400 | [diff] [blame] | 4154 | ext_debug("blocks %u/%u requested for inode %lu\n", |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4155 | map->m_lblk, map->m_len, inode->i_ino); |
Jiaying Zhang | 0562e0b | 2011-03-21 21:38:05 -0400 | [diff] [blame] | 4156 | 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] | 4157 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4158 | /* find extent for this block */ |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 4159 | path = ext4_ext_find_extent(inode, map->m_lblk, NULL, 0); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4160 | if (IS_ERR(path)) { |
| 4161 | err = PTR_ERR(path); |
| 4162 | path = NULL; |
| 4163 | goto out2; |
| 4164 | } |
| 4165 | |
| 4166 | depth = ext_depth(inode); |
| 4167 | |
| 4168 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 4169 | * consistent leaf must not be empty; |
| 4170 | * this situation is possible, though, _during_ tree modification; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4171 | * this is why assert can't be put in ext4_ext_find_extent() |
| 4172 | */ |
Frank Mayhar | 273df55 | 2010-03-02 11:46:09 -0500 | [diff] [blame] | 4173 | if (unlikely(path[depth].p_ext == NULL && depth != 0)) { |
| 4174 | EXT4_ERROR_INODE(inode, "bad extent address " |
Theodore Ts'o | f70f362 | 2010-05-16 23:00:00 -0400 | [diff] [blame] | 4175 | "lblock: %lu, depth: %d pblock %lld", |
| 4176 | (unsigned long) map->m_lblk, depth, |
| 4177 | path[depth].p_block); |
Surbhi Palande | 034fb4c | 2009-12-14 09:53:52 -0500 | [diff] [blame] | 4178 | err = -EIO; |
| 4179 | goto out2; |
| 4180 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4181 | |
Avantika Mathur | 7e02897 | 2006-12-06 20:41:33 -0800 | [diff] [blame] | 4182 | ex = path[depth].p_ext; |
| 4183 | if (ex) { |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 4184 | ext4_lblk_t ee_block = le32_to_cpu(ex->ee_block); |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 4185 | ext4_fsblk_t ee_start = ext4_ext_pblock(ex); |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4186 | unsigned short ee_len; |
Suparna Bhattacharya | 471d401 | 2006-10-11 01:21:06 -0700 | [diff] [blame] | 4187 | |
| 4188 | /* |
Suparna Bhattacharya | 471d401 | 2006-10-11 01:21:06 -0700 | [diff] [blame] | 4189 | * Uninitialized extents are treated as holes, except that |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 4190 | * we split out initialized portions during a write. |
Suparna Bhattacharya | 471d401 | 2006-10-11 01:21:06 -0700 | [diff] [blame] | 4191 | */ |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4192 | ee_len = ext4_ext_get_actual_len(ex); |
Aditya Kali | d899024 | 2011-09-09 19:18:51 -0400 | [diff] [blame] | 4193 | |
| 4194 | trace_ext4_ext_show_extent(inode, ee_block, ee_start, ee_len); |
| 4195 | |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 4196 | /* if found extent covers block, simply return it */ |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4197 | if (in_range(map->m_lblk, ee_block, ee_len)) { |
| 4198 | newblock = map->m_lblk - ee_block + ee_start; |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 4199 | /* number of remaining blocks in the extent */ |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4200 | allocated = ee_len - (map->m_lblk - ee_block); |
| 4201 | ext_debug("%u fit into %u:%d -> %llu\n", map->m_lblk, |
| 4202 | ee_block, ee_len, newblock); |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 4203 | |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 4204 | if (!ext4_ext_is_uninitialized(ex)) |
Lukas Czerner | 7877191 | 2012-03-19 23:05:43 -0400 | [diff] [blame] | 4205 | goto out; |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 4206 | |
Zheng Liu | 3779473 | 2012-11-08 14:47:52 -0500 | [diff] [blame] | 4207 | allocated = ext4_ext_handle_uninitialized_extents( |
Lukas Czerner | 7877191 | 2012-03-19 23:05:43 -0400 | [diff] [blame] | 4208 | handle, inode, map, path, flags, |
| 4209 | allocated, newblock); |
Zheng Liu | 3779473 | 2012-11-08 14:47:52 -0500 | [diff] [blame] | 4210 | goto out3; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4211 | } |
| 4212 | } |
| 4213 | |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 4214 | if ((sbi->s_cluster_ratio > 1) && |
Zheng Liu | 7d1b1fb | 2012-11-08 21:57:35 -0500 | [diff] [blame] | 4215 | ext4_find_delalloc_cluster(inode, map->m_lblk)) |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 4216 | map->m_flags |= EXT4_MAP_FROM_CLUSTER; |
| 4217 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4218 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 4219 | * requested block isn't allocated yet; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4220 | * we couldn't try to create block if create flag is zero |
| 4221 | */ |
Theodore Ts'o | c217705 | 2009-05-14 00:58:52 -0400 | [diff] [blame] | 4222 | if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) { |
Amit Arora | 56055d3 | 2007-07-17 21:42:38 -0400 | [diff] [blame] | 4223 | /* |
| 4224 | * put just found gap into cache to speed up |
| 4225 | * subsequent requests |
| 4226 | */ |
Zheng Liu | d100eef | 2013-02-18 00:29:59 -0500 | [diff] [blame] | 4227 | if ((flags & EXT4_GET_BLOCKS_NO_PUT_HOLE) == 0) |
| 4228 | ext4_ext_put_gap_in_cache(inode, path, map->m_lblk); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4229 | goto out2; |
| 4230 | } |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4231 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4232 | /* |
Theodore Ts'o | c2ea3fd | 2008-10-10 09:40:52 -0400 | [diff] [blame] | 4233 | * Okay, we need to do block allocation. |
Andrew Morton | 63f5793 | 2006-10-11 01:21:24 -0700 | [diff] [blame] | 4234 | */ |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 4235 | map->m_flags &= ~EXT4_MAP_FROM_CLUSTER; |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4236 | newex.ee_block = cpu_to_le32(map->m_lblk); |
| 4237 | cluster_offset = map->m_lblk & (sbi->s_cluster_ratio-1); |
| 4238 | |
| 4239 | /* |
| 4240 | * If we are doing bigalloc, check to see if the extent returned |
| 4241 | * by ext4_ext_find_extent() implies a cluster we can use. |
| 4242 | */ |
| 4243 | if (cluster_offset && ex && |
Aditya Kali | d899024 | 2011-09-09 19:18:51 -0400 | [diff] [blame] | 4244 | get_implied_cluster_alloc(inode->i_sb, map, ex, path)) { |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4245 | ar.len = allocated = map->m_len; |
| 4246 | newblock = map->m_pblk; |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 4247 | map->m_flags |= EXT4_MAP_FROM_CLUSTER; |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4248 | goto got_allocated_blocks; |
| 4249 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4250 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4251 | /* find neighbour allocated blocks */ |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4252 | ar.lleft = map->m_lblk; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4253 | err = ext4_ext_search_left(inode, path, &ar.lleft, &ar.pleft); |
| 4254 | if (err) |
| 4255 | goto out2; |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4256 | ar.lright = map->m_lblk; |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4257 | ex2 = NULL; |
| 4258 | err = ext4_ext_search_right(inode, path, &ar.lright, &ar.pright, &ex2); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4259 | if (err) |
| 4260 | goto out2; |
Amit Arora | 25d14f9 | 2007-05-24 13:04:13 -0400 | [diff] [blame] | 4261 | |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4262 | /* Check if the extent after searching to the right implies a |
| 4263 | * cluster we can use. */ |
| 4264 | if ((sbi->s_cluster_ratio > 1) && ex2 && |
Aditya Kali | d899024 | 2011-09-09 19:18:51 -0400 | [diff] [blame] | 4265 | get_implied_cluster_alloc(inode->i_sb, map, ex2, path)) { |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4266 | ar.len = allocated = map->m_len; |
| 4267 | newblock = map->m_pblk; |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 4268 | map->m_flags |= EXT4_MAP_FROM_CLUSTER; |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4269 | goto got_allocated_blocks; |
| 4270 | } |
| 4271 | |
Amit Arora | 749269f | 2007-07-18 09:02:56 -0400 | [diff] [blame] | 4272 | /* |
| 4273 | * See if request is beyond maximum number of blocks we can have in |
| 4274 | * a single extent. For an initialized extent this limit is |
| 4275 | * EXT_INIT_MAX_LEN and for an uninitialized extent this limit is |
| 4276 | * EXT_UNINIT_MAX_LEN. |
| 4277 | */ |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4278 | if (map->m_len > EXT_INIT_MAX_LEN && |
Theodore Ts'o | c217705 | 2009-05-14 00:58:52 -0400 | [diff] [blame] | 4279 | !(flags & EXT4_GET_BLOCKS_UNINIT_EXT)) |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4280 | map->m_len = EXT_INIT_MAX_LEN; |
| 4281 | else if (map->m_len > EXT_UNINIT_MAX_LEN && |
Theodore Ts'o | c217705 | 2009-05-14 00:58:52 -0400 | [diff] [blame] | 4282 | (flags & EXT4_GET_BLOCKS_UNINIT_EXT)) |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4283 | map->m_len = EXT_UNINIT_MAX_LEN; |
Amit Arora | 749269f | 2007-07-18 09:02:56 -0400 | [diff] [blame] | 4284 | |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4285 | /* 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] | 4286 | newex.ee_len = cpu_to_le16(map->m_len); |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4287 | err = ext4_ext_check_overlap(sbi, inode, &newex, path); |
Amit Arora | 25d14f9 | 2007-05-24 13:04:13 -0400 | [diff] [blame] | 4288 | if (err) |
Aneesh Kumar K.V | b939e37 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 4289 | allocated = ext4_ext_get_actual_len(&newex); |
Amit Arora | 25d14f9 | 2007-05-24 13:04:13 -0400 | [diff] [blame] | 4290 | else |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4291 | allocated = map->m_len; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4292 | |
| 4293 | /* allocate new block */ |
| 4294 | ar.inode = inode; |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4295 | ar.goal = ext4_ext_find_goal(inode, path, map->m_lblk); |
| 4296 | ar.logical = map->m_lblk; |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4297 | /* |
| 4298 | * We calculate the offset from the beginning of the cluster |
| 4299 | * for the logical block number, since when we allocate a |
| 4300 | * physical cluster, the physical block should start at the |
| 4301 | * same offset from the beginning of the cluster. This is |
| 4302 | * needed so that future calls to get_implied_cluster_alloc() |
| 4303 | * work correctly. |
| 4304 | */ |
| 4305 | offset = map->m_lblk & (sbi->s_cluster_ratio - 1); |
| 4306 | ar.len = EXT4_NUM_B2C(sbi, offset+allocated); |
| 4307 | ar.goal -= offset; |
| 4308 | ar.logical -= offset; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4309 | if (S_ISREG(inode->i_mode)) |
| 4310 | ar.flags = EXT4_MB_HINT_DATA; |
| 4311 | else |
| 4312 | /* disable in-core preallocation for non-regular files */ |
| 4313 | ar.flags = 0; |
Vivek Haldar | 556b27a | 2011-05-25 07:41:54 -0400 | [diff] [blame] | 4314 | if (flags & EXT4_GET_BLOCKS_NO_NORMALIZE) |
| 4315 | ar.flags |= EXT4_MB_HINT_NOPREALLOC; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4316 | newblock = ext4_mb_new_blocks(handle, &ar, &err); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4317 | if (!newblock) |
| 4318 | goto out2; |
Mingming | 84fe3be | 2009-09-01 08:44:37 -0400 | [diff] [blame] | 4319 | ext_debug("allocate new block: goal %llu, found %llu/%u\n", |
Theodore Ts'o | 498e5f2 | 2008-11-05 00:14:04 -0500 | [diff] [blame] | 4320 | ar.goal, newblock, allocated); |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4321 | free_on_err = 1; |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 4322 | allocated_clusters = ar.len; |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4323 | ar.len = EXT4_C2B(sbi, ar.len) - offset; |
| 4324 | if (ar.len > allocated) |
| 4325 | ar.len = allocated; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4326 | |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4327 | got_allocated_blocks: |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4328 | /* try to insert new extent into found leaf and return */ |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4329 | ext4_ext_store_pblock(&newex, newblock + offset); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4330 | newex.ee_len = cpu_to_le16(ar.len); |
Mingming Cao | 8d5d02e | 2009-09-28 15:48:29 -0400 | [diff] [blame] | 4331 | /* Mark uninitialized */ |
| 4332 | if (flags & EXT4_GET_BLOCKS_UNINIT_EXT){ |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4333 | ext4_ext_mark_uninitialized(&newex); |
Zheng Liu | a25a4e1 | 2013-02-18 00:28:04 -0500 | [diff] [blame] | 4334 | map->m_flags |= EXT4_MAP_UNWRITTEN; |
Mingming Cao | 8d5d02e | 2009-09-28 15:48:29 -0400 | [diff] [blame] | 4335 | /* |
Jiaying Zhang | 744692d | 2010-03-04 16:14:02 -0500 | [diff] [blame] | 4336 | * io_end structure was created for every IO write to an |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 4337 | * uninitialized extent. To avoid unnecessary conversion, |
Jiaying Zhang | 744692d | 2010-03-04 16:14:02 -0500 | [diff] [blame] | 4338 | * here we flag the IO that really needs the conversion. |
Mingming | 5f52495 | 2009-11-10 10:48:04 -0500 | [diff] [blame] | 4339 | * For non asycn direct IO case, flag the inode state |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 4340 | * that we need to perform conversion when IO is done. |
Mingming Cao | 8d5d02e | 2009-09-28 15:48:29 -0400 | [diff] [blame] | 4341 | */ |
Dmitry Monakhov | 82e5422 | 2012-09-28 23:36:25 -0400 | [diff] [blame] | 4342 | if ((flags & EXT4_GET_BLOCKS_PRE_IO)) |
| 4343 | set_unwritten = 1; |
Jiaying Zhang | 744692d | 2010-03-04 16:14:02 -0500 | [diff] [blame] | 4344 | if (ext4_should_dioread_nolock(inode)) |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4345 | map->m_flags |= EXT4_MAP_UNINIT; |
Mingming Cao | 8d5d02e | 2009-09-28 15:48:29 -0400 | [diff] [blame] | 4346 | } |
Jiaying Zhang | c8d46e4 | 2010-02-24 09:52:53 -0500 | [diff] [blame] | 4347 | |
Dmitry Monakhov | a4e5d88 | 2011-10-25 08:15:12 -0400 | [diff] [blame] | 4348 | err = 0; |
| 4349 | if ((flags & EXT4_GET_BLOCKS_KEEP_SIZE) == 0) |
| 4350 | err = check_eofblocks_fl(handle, inode, map->m_lblk, |
| 4351 | path, ar.len); |
Jiaying Zhang | 575a1d4 | 2011-07-10 20:07:25 -0400 | [diff] [blame] | 4352 | if (!err) |
| 4353 | err = ext4_ext_insert_extent(handle, inode, path, |
| 4354 | &newex, flags); |
Dmitry Monakhov | 82e5422 | 2012-09-28 23:36:25 -0400 | [diff] [blame] | 4355 | |
| 4356 | if (!err && set_unwritten) { |
| 4357 | if (io) |
| 4358 | ext4_set_io_unwritten_flag(inode, io); |
| 4359 | else |
| 4360 | ext4_set_inode_state(inode, |
| 4361 | EXT4_STATE_DIO_UNWRITTEN); |
| 4362 | } |
| 4363 | |
Theodore Ts'o | 4d33b1e | 2011-09-09 18:52:51 -0400 | [diff] [blame] | 4364 | if (err && free_on_err) { |
Maxim Patlasov | 7132de7 | 2011-07-10 19:37:48 -0400 | [diff] [blame] | 4365 | int fb_flags = flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE ? |
| 4366 | EXT4_FREE_BLOCKS_NO_QUOT_UPDATE : 0; |
Alex Tomas | 315054f | 2007-05-24 13:04:25 -0400 | [diff] [blame] | 4367 | /* free data blocks we just allocated */ |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4368 | /* not a good idea to call discard here directly, |
| 4369 | * but otherwise we'd need to call it every free() */ |
Theodore Ts'o | c2ea3fd | 2008-10-10 09:40:52 -0400 | [diff] [blame] | 4370 | ext4_discard_preallocations(inode); |
Theodore Ts'o | c8e1513 | 2013-07-15 00:09:37 -0400 | [diff] [blame] | 4371 | ext4_free_blocks(handle, inode, NULL, newblock, |
| 4372 | EXT4_C2B(sbi, allocated_clusters), fb_flags); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4373 | goto out2; |
Alex Tomas | 315054f | 2007-05-24 13:04:25 -0400 | [diff] [blame] | 4374 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4375 | |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4376 | /* previous routine could use block we allocated */ |
Theodore Ts'o | bf89d16 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 4377 | newblock = ext4_ext_pblock(&newex); |
Aneesh Kumar K.V | b939e37 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 4378 | allocated = ext4_ext_get_actual_len(&newex); |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4379 | if (allocated > map->m_len) |
| 4380 | allocated = map->m_len; |
| 4381 | map->m_flags |= EXT4_MAP_NEW; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4382 | |
Jan Kara | b436b9b | 2009-12-08 23:51:10 -0500 | [diff] [blame] | 4383 | /* |
Aneesh Kumar K.V | 5f634d0 | 2010-01-25 04:00:31 -0500 | [diff] [blame] | 4384 | * Update reserved blocks/metadata blocks after successful |
| 4385 | * block allocation which had been deferred till now. |
| 4386 | */ |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 4387 | if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) { |
Yongqiang Yang | 81fdbb4 | 2011-10-29 09:23:38 -0400 | [diff] [blame] | 4388 | unsigned int reserved_clusters; |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 4389 | /* |
Yongqiang Yang | 81fdbb4 | 2011-10-29 09:23:38 -0400 | [diff] [blame] | 4390 | * Check how many clusters we had reserved this allocated range |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 4391 | */ |
| 4392 | reserved_clusters = get_reserved_cluster_alloc(inode, |
| 4393 | map->m_lblk, allocated); |
| 4394 | if (map->m_flags & EXT4_MAP_FROM_CLUSTER) { |
| 4395 | if (reserved_clusters) { |
| 4396 | /* |
| 4397 | * We have clusters reserved for this range. |
| 4398 | * But since we are not doing actual allocation |
| 4399 | * and are simply using blocks from previously |
| 4400 | * allocated cluster, we should release the |
| 4401 | * reservation and not claim quota. |
| 4402 | */ |
| 4403 | ext4_da_update_reserve_space(inode, |
| 4404 | reserved_clusters, 0); |
| 4405 | } |
| 4406 | } else { |
| 4407 | BUG_ON(allocated_clusters < reserved_clusters); |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 4408 | if (reserved_clusters < allocated_clusters) { |
Aditya Kali | 5356f26 | 2011-09-09 19:20:51 -0400 | [diff] [blame] | 4409 | struct ext4_inode_info *ei = EXT4_I(inode); |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 4410 | int reservation = allocated_clusters - |
| 4411 | reserved_clusters; |
| 4412 | /* |
| 4413 | * It seems we claimed few clusters outside of |
| 4414 | * the range of this allocation. We should give |
| 4415 | * it back to the reservation pool. This can |
| 4416 | * happen in the following case: |
| 4417 | * |
| 4418 | * * Suppose s_cluster_ratio is 4 (i.e., each |
| 4419 | * cluster has 4 blocks. Thus, the clusters |
| 4420 | * are [0-3],[4-7],[8-11]... |
| 4421 | * * First comes delayed allocation write for |
| 4422 | * logical blocks 10 & 11. Since there were no |
| 4423 | * previous delayed allocated blocks in the |
| 4424 | * range [8-11], we would reserve 1 cluster |
| 4425 | * for this write. |
| 4426 | * * Next comes write for logical blocks 3 to 8. |
| 4427 | * In this case, we will reserve 2 clusters |
| 4428 | * (for [0-3] and [4-7]; and not for [8-11] as |
| 4429 | * that range has a delayed allocated blocks. |
| 4430 | * Thus total reserved clusters now becomes 3. |
| 4431 | * * Now, during the delayed allocation writeout |
| 4432 | * time, we will first write blocks [3-8] and |
| 4433 | * allocate 3 clusters for writing these |
| 4434 | * blocks. Also, we would claim all these |
| 4435 | * three clusters above. |
| 4436 | * * Now when we come here to writeout the |
| 4437 | * blocks [10-11], we would expect to claim |
| 4438 | * the reservation of 1 cluster we had made |
| 4439 | * (and we would claim it since there are no |
| 4440 | * more delayed allocated blocks in the range |
| 4441 | * [8-11]. But our reserved cluster count had |
| 4442 | * already gone to 0. |
| 4443 | * |
| 4444 | * Thus, at the step 4 above when we determine |
| 4445 | * that there are still some unwritten delayed |
| 4446 | * allocated blocks outside of our current |
| 4447 | * block range, we should increment the |
| 4448 | * reserved clusters count so that when the |
| 4449 | * remaining blocks finally gets written, we |
| 4450 | * could claim them. |
| 4451 | */ |
Aditya Kali | 5356f26 | 2011-09-09 19:20:51 -0400 | [diff] [blame] | 4452 | dquot_reserve_block(inode, |
| 4453 | EXT4_C2B(sbi, reservation)); |
| 4454 | spin_lock(&ei->i_block_reservation_lock); |
| 4455 | ei->i_reserved_data_blocks += reservation; |
| 4456 | spin_unlock(&ei->i_block_reservation_lock); |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 4457 | } |
Lukas Czerner | 232ec87 | 2013-03-10 22:46:30 -0400 | [diff] [blame] | 4458 | /* |
| 4459 | * We will claim quota for all newly allocated blocks. |
| 4460 | * We're updating the reserved space *after* the |
| 4461 | * correction above so we do not accidentally free |
| 4462 | * all the metadata reservation because we might |
| 4463 | * actually need it later on. |
| 4464 | */ |
| 4465 | ext4_da_update_reserve_space(inode, allocated_clusters, |
| 4466 | 1); |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 4467 | } |
| 4468 | } |
Aneesh Kumar K.V | 5f634d0 | 2010-01-25 04:00:31 -0500 | [diff] [blame] | 4469 | |
| 4470 | /* |
Jan Kara | b436b9b | 2009-12-08 23:51:10 -0500 | [diff] [blame] | 4471 | * Cache the extent and update transaction to commit on fdatasync only |
| 4472 | * when it is _not_ an uninitialized extent. |
| 4473 | */ |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 4474 | if ((flags & EXT4_GET_BLOCKS_UNINIT_EXT) == 0) |
Jan Kara | b436b9b | 2009-12-08 23:51:10 -0500 | [diff] [blame] | 4475 | ext4_update_inode_fsync_trans(handle, inode, 1); |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 4476 | else |
Jan Kara | b436b9b | 2009-12-08 23:51:10 -0500 | [diff] [blame] | 4477 | ext4_update_inode_fsync_trans(handle, inode, 0); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4478 | out: |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4479 | if (allocated > map->m_len) |
| 4480 | allocated = map->m_len; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4481 | ext4_ext_show_leaf(inode, path); |
Theodore Ts'o | e35fd66 | 2010-05-16 19:00:00 -0400 | [diff] [blame] | 4482 | map->m_flags |= EXT4_MAP_MAPPED; |
| 4483 | map->m_pblk = newblock; |
| 4484 | map->m_len = allocated; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4485 | out2: |
| 4486 | if (path) { |
| 4487 | ext4_ext_drop_refs(path); |
| 4488 | kfree(path); |
| 4489 | } |
Allison Henderson | e861304 | 2011-05-25 07:41:46 -0400 | [diff] [blame] | 4490 | |
Zheng Liu | 3779473 | 2012-11-08 14:47:52 -0500 | [diff] [blame] | 4491 | out3: |
Theodore Ts'o | 63b9996 | 2013-07-16 10:28:47 -0400 | [diff] [blame] | 4492 | trace_ext4_ext_map_blocks_exit(inode, flags, map, |
| 4493 | err ? err : allocated); |
| 4494 | ext4_es_lru_add(inode); |
Lukas Czerner | 7877191 | 2012-03-19 23:05:43 -0400 | [diff] [blame] | 4495 | return err ? err : allocated; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4496 | } |
| 4497 | |
Theodore Ts'o | 819c492 | 2013-04-03 12:47:17 -0400 | [diff] [blame] | 4498 | void ext4_ext_truncate(handle_t *handle, struct inode *inode) |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4499 | { |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4500 | struct super_block *sb = inode->i_sb; |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 4501 | ext4_lblk_t last_block; |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4502 | int err = 0; |
| 4503 | |
| 4504 | /* |
Randy Dunlap | d0d856e | 2006-10-11 01:21:07 -0700 | [diff] [blame] | 4505 | * TODO: optimization is possible here. |
| 4506 | * Probably we need not scan at all, |
| 4507 | * because page truncation is enough. |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4508 | */ |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4509 | |
| 4510 | /* we have to know where to truncate from in crash case */ |
| 4511 | EXT4_I(inode)->i_disksize = inode->i_size; |
| 4512 | ext4_mark_inode_dirty(handle, inode); |
| 4513 | |
| 4514 | last_block = (inode->i_size + sb->s_blocksize - 1) |
| 4515 | >> EXT4_BLOCK_SIZE_BITS(sb); |
Theodore Ts'o | 8acd5e9 | 2013-07-15 00:09:19 -0400 | [diff] [blame] | 4516 | retry: |
Zheng Liu | 51865fd | 2012-11-08 21:57:32 -0500 | [diff] [blame] | 4517 | err = ext4_es_remove_extent(inode, last_block, |
| 4518 | EXT_MAX_BLOCKS - last_block); |
Theodore Ts'o | 94eec0f | 2013-07-29 12:12:56 -0400 | [diff] [blame] | 4519 | if (err == -ENOMEM) { |
Theodore Ts'o | 8acd5e9 | 2013-07-15 00:09:19 -0400 | [diff] [blame] | 4520 | cond_resched(); |
| 4521 | congestion_wait(BLK_RW_ASYNC, HZ/50); |
| 4522 | goto retry; |
| 4523 | } |
| 4524 | if (err) { |
| 4525 | ext4_std_error(inode->i_sb, err); |
| 4526 | return; |
| 4527 | } |
Lukas Czerner | 5f95d21 | 2012-03-19 23:03:19 -0400 | [diff] [blame] | 4528 | 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] | 4529 | ext4_std_error(inode->i_sb, err); |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 4530 | } |
| 4531 | |
Aneesh Kumar K.V | fd28784 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 4532 | static void ext4_falloc_update_inode(struct inode *inode, |
| 4533 | int mode, loff_t new_size, int update_ctime) |
| 4534 | { |
| 4535 | struct timespec now; |
| 4536 | |
| 4537 | if (update_ctime) { |
| 4538 | now = current_fs_time(inode->i_sb); |
| 4539 | if (!timespec_equal(&inode->i_ctime, &now)) |
| 4540 | inode->i_ctime = now; |
| 4541 | } |
| 4542 | /* |
| 4543 | * Update only when preallocation was requested beyond |
| 4544 | * the file size. |
| 4545 | */ |
Aneesh Kumar K.V | cf17fea | 2008-09-13 13:06:18 -0400 | [diff] [blame] | 4546 | if (!(mode & FALLOC_FL_KEEP_SIZE)) { |
| 4547 | if (new_size > i_size_read(inode)) |
| 4548 | i_size_write(inode, new_size); |
| 4549 | if (new_size > EXT4_I(inode)->i_disksize) |
| 4550 | ext4_update_i_disksize(inode, new_size); |
Jiaying Zhang | c8d46e4 | 2010-02-24 09:52:53 -0500 | [diff] [blame] | 4551 | } else { |
| 4552 | /* |
| 4553 | * Mark that we allocate beyond EOF so the subsequent truncate |
| 4554 | * can proceed even if the new size is the same as i_size. |
| 4555 | */ |
| 4556 | if (new_size > i_size_read(inode)) |
Dmitry Monakhov | 12e9b89 | 2010-05-16 22:00:00 -0400 | [diff] [blame] | 4557 | ext4_set_inode_flag(inode, EXT4_INODE_EOFBLOCKS); |
Aneesh Kumar K.V | fd28784 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 4558 | } |
| 4559 | |
| 4560 | } |
| 4561 | |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4562 | /* |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 4563 | * preallocate space for a file. This implements ext4's fallocate file |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4564 | * operation, which gets called from sys_fallocate system call. |
| 4565 | * For block-mapped files, posix_fallocate should fall back to the method |
| 4566 | * of writing zeroes to the required new blocks (the same behavior which is |
| 4567 | * expected for file systems which do not support fallocate() system call). |
| 4568 | */ |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 4569 | long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len) |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4570 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 4571 | struct inode *inode = file_inode(file); |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4572 | handle_t *handle; |
Aneesh Kumar K.V | fd28784 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 4573 | loff_t new_size; |
Theodore Ts'o | 498e5f2 | 2008-11-05 00:14:04 -0500 | [diff] [blame] | 4574 | unsigned int max_blocks; |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4575 | int ret = 0; |
| 4576 | int ret2 = 0; |
| 4577 | int retries = 0; |
Dmitry Monakhov | a4e5d88 | 2011-10-25 08:15:12 -0400 | [diff] [blame] | 4578 | int flags; |
Theodore Ts'o | 2ed8868 | 2010-05-16 20:00:00 -0400 | [diff] [blame] | 4579 | struct ext4_map_blocks map; |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4580 | unsigned int credits, blkbits = inode->i_blkbits; |
| 4581 | |
Allison Henderson | a4bb6b6 | 2011-05-25 07:41:50 -0400 | [diff] [blame] | 4582 | /* Return error if mode is not supported */ |
| 4583 | if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) |
| 4584 | return -EOPNOTSUPP; |
| 4585 | |
| 4586 | if (mode & FALLOC_FL_PUNCH_HOLE) |
Ashish Sangwan | aeb2817 | 2013-07-01 08:12:38 -0400 | [diff] [blame] | 4587 | return ext4_punch_hole(inode, offset, len); |
Allison Henderson | a4bb6b6 | 2011-05-25 07:41:50 -0400 | [diff] [blame] | 4588 | |
Tao Ma | 0c8d414 | 2012-12-10 14:06:03 -0500 | [diff] [blame] | 4589 | ret = ext4_convert_inline_data(inode); |
| 4590 | if (ret) |
| 4591 | return ret; |
| 4592 | |
Zheng Liu | 8bad6fc | 2013-01-28 09:21:37 -0500 | [diff] [blame] | 4593 | /* |
| 4594 | * currently supporting (pre)allocate mode for extent-based |
| 4595 | * files _only_ |
| 4596 | */ |
| 4597 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
| 4598 | return -EOPNOTSUPP; |
| 4599 | |
Jiaying Zhang | 0562e0b | 2011-03-21 21:38:05 -0400 | [diff] [blame] | 4600 | trace_ext4_fallocate_enter(inode, offset, len, mode); |
Theodore Ts'o | 2ed8868 | 2010-05-16 20:00:00 -0400 | [diff] [blame] | 4601 | map.m_lblk = offset >> blkbits; |
Aneesh Kumar K.V | fd28784 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 4602 | /* |
| 4603 | * We can't just convert len to max_blocks because |
| 4604 | * If blocksize = 4096 offset = 3072 and len = 2048 |
| 4605 | */ |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4606 | max_blocks = (EXT4_BLOCK_ALIGN(len + offset, blkbits) >> blkbits) |
Theodore Ts'o | 2ed8868 | 2010-05-16 20:00:00 -0400 | [diff] [blame] | 4607 | - map.m_lblk; |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4608 | /* |
Mingming Cao | f3bd1f3 | 2008-08-19 22:16:03 -0400 | [diff] [blame] | 4609 | * credits to insert 1 extent into extent tree |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4610 | */ |
Mingming Cao | f3bd1f3 | 2008-08-19 22:16:03 -0400 | [diff] [blame] | 4611 | credits = ext4_chunk_trans_blocks(inode, max_blocks); |
Aneesh Kumar K.V | 55bd725 | 2008-02-15 12:47:21 -0500 | [diff] [blame] | 4612 | mutex_lock(&inode->i_mutex); |
Nikanth Karthikesan | 6d19c42 | 2010-05-16 14:00:00 -0400 | [diff] [blame] | 4613 | ret = inode_newsize_ok(inode, (len + offset)); |
| 4614 | if (ret) { |
| 4615 | mutex_unlock(&inode->i_mutex); |
Jiaying Zhang | 0562e0b | 2011-03-21 21:38:05 -0400 | [diff] [blame] | 4616 | trace_ext4_fallocate_exit(inode, offset, max_blocks, ret); |
Nikanth Karthikesan | 6d19c42 | 2010-05-16 14:00:00 -0400 | [diff] [blame] | 4617 | return ret; |
| 4618 | } |
Greg Harm | 3c6fe77 | 2011-10-31 18:41:47 -0400 | [diff] [blame] | 4619 | flags = EXT4_GET_BLOCKS_CREATE_UNINIT_EXT; |
Dmitry Monakhov | a4e5d88 | 2011-10-25 08:15:12 -0400 | [diff] [blame] | 4620 | if (mode & FALLOC_FL_KEEP_SIZE) |
| 4621 | flags |= EXT4_GET_BLOCKS_KEEP_SIZE; |
Greg Harm | 3c6fe77 | 2011-10-31 18:41:47 -0400 | [diff] [blame] | 4622 | /* |
| 4623 | * Don't normalize the request if it can fit in one extent so |
| 4624 | * that it doesn't get unnecessarily split into multiple |
| 4625 | * extents. |
| 4626 | */ |
| 4627 | if (len <= EXT_UNINIT_MAX_LEN << blkbits) |
| 4628 | flags |= EXT4_GET_BLOCKS_NO_NORMALIZE; |
Dmitry Monakhov | 60d4616 | 2012-10-05 11:32:02 -0400 | [diff] [blame] | 4629 | |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4630 | retry: |
| 4631 | while (ret >= 0 && ret < max_blocks) { |
Theodore Ts'o | 2ed8868 | 2010-05-16 20:00:00 -0400 | [diff] [blame] | 4632 | map.m_lblk = map.m_lblk + ret; |
| 4633 | map.m_len = max_blocks = max_blocks - ret; |
Theodore Ts'o | 9924a92 | 2013-02-08 21:59:22 -0500 | [diff] [blame] | 4634 | handle = ext4_journal_start(inode, EXT4_HT_MAP_BLOCKS, |
| 4635 | credits); |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4636 | if (IS_ERR(handle)) { |
| 4637 | ret = PTR_ERR(handle); |
| 4638 | break; |
| 4639 | } |
Dmitry Monakhov | a4e5d88 | 2011-10-25 08:15:12 -0400 | [diff] [blame] | 4640 | ret = ext4_map_blocks(handle, inode, &map, flags); |
Aneesh Kumar K.V | 221879c | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 4641 | if (ret <= 0) { |
Aneesh Kumar K.V | 2c98615 | 2008-02-25 15:41:35 -0500 | [diff] [blame] | 4642 | #ifdef EXT4FS_DEBUG |
Lukas Czerner | b06acd3 | 2013-01-28 21:21:12 -0500 | [diff] [blame] | 4643 | ext4_warning(inode->i_sb, |
| 4644 | "inode #%lu: block %u: len %u: " |
| 4645 | "ext4_ext_map_blocks returned %d", |
| 4646 | inode->i_ino, map.m_lblk, |
| 4647 | map.m_len, ret); |
Aneesh Kumar K.V | 2c98615 | 2008-02-25 15:41:35 -0500 | [diff] [blame] | 4648 | #endif |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4649 | ext4_mark_inode_dirty(handle, inode); |
| 4650 | ret2 = ext4_journal_stop(handle); |
| 4651 | break; |
| 4652 | } |
Theodore Ts'o | 2ed8868 | 2010-05-16 20:00:00 -0400 | [diff] [blame] | 4653 | if ((map.m_lblk + ret) >= (EXT4_BLOCK_ALIGN(offset + len, |
Aneesh Kumar K.V | fd28784 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 4654 | blkbits) >> blkbits)) |
| 4655 | new_size = offset + len; |
| 4656 | else |
Utako Kusaka | 29ae07b | 2011-07-27 22:11:20 -0400 | [diff] [blame] | 4657 | new_size = ((loff_t) map.m_lblk + ret) << blkbits; |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4658 | |
Aneesh Kumar K.V | fd28784 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 4659 | ext4_falloc_update_inode(inode, mode, new_size, |
Theodore Ts'o | 2ed8868 | 2010-05-16 20:00:00 -0400 | [diff] [blame] | 4660 | (map.m_flags & EXT4_MAP_NEW)); |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4661 | ext4_mark_inode_dirty(handle, inode); |
Zheng Liu | f4e95b3 | 2012-06-30 19:12:57 -0400 | [diff] [blame] | 4662 | if ((file->f_flags & O_SYNC) && ret >= max_blocks) |
| 4663 | ext4_handle_sync(handle); |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4664 | ret2 = ext4_journal_stop(handle); |
| 4665 | if (ret2) |
| 4666 | break; |
| 4667 | } |
Aneesh Kumar K.V | fd28784 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 4668 | if (ret == -ENOSPC && |
| 4669 | ext4_should_retry_alloc(inode->i_sb, &retries)) { |
| 4670 | ret = 0; |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4671 | goto retry; |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4672 | } |
Aneesh Kumar K.V | 55bd725 | 2008-02-15 12:47:21 -0500 | [diff] [blame] | 4673 | mutex_unlock(&inode->i_mutex); |
Jiaying Zhang | 0562e0b | 2011-03-21 21:38:05 -0400 | [diff] [blame] | 4674 | trace_ext4_fallocate_exit(inode, offset, max_blocks, |
| 4675 | ret > 0 ? ret2 : ret); |
Amit Arora | a2df2a6 | 2007-07-17 21:42:41 -0400 | [diff] [blame] | 4676 | return ret > 0 ? ret2 : ret; |
| 4677 | } |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 4678 | |
| 4679 | /* |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4680 | * This function convert a range of blocks to written extents |
| 4681 | * The caller of this function will pass the start offset and the size. |
| 4682 | * all unwritten extents within this range will be converted to |
| 4683 | * written extents. |
| 4684 | * |
| 4685 | * This function is called from the direct IO end io call back |
| 4686 | * function, to convert the fallocated extents after IO is completed. |
Mingming | 109f556 | 2009-11-10 10:48:08 -0500 | [diff] [blame] | 4687 | * Returns 0 on success. |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4688 | */ |
Jan Kara | 6b523df | 2013-06-04 13:21:11 -0400 | [diff] [blame] | 4689 | int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, |
| 4690 | loff_t offset, ssize_t len) |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4691 | { |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4692 | unsigned int max_blocks; |
| 4693 | int ret = 0; |
| 4694 | int ret2 = 0; |
Theodore Ts'o | 2ed8868 | 2010-05-16 20:00:00 -0400 | [diff] [blame] | 4695 | struct ext4_map_blocks map; |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4696 | unsigned int credits, blkbits = inode->i_blkbits; |
| 4697 | |
Theodore Ts'o | 2ed8868 | 2010-05-16 20:00:00 -0400 | [diff] [blame] | 4698 | map.m_lblk = offset >> blkbits; |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4699 | /* |
| 4700 | * We can't just convert len to max_blocks because |
| 4701 | * If blocksize = 4096 offset = 3072 and len = 2048 |
| 4702 | */ |
Theodore Ts'o | 2ed8868 | 2010-05-16 20:00:00 -0400 | [diff] [blame] | 4703 | max_blocks = ((EXT4_BLOCK_ALIGN(len + offset, blkbits) >> blkbits) - |
| 4704 | map.m_lblk); |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4705 | /* |
Jan Kara | 6b523df | 2013-06-04 13:21:11 -0400 | [diff] [blame] | 4706 | * This is somewhat ugly but the idea is clear: When transaction is |
| 4707 | * reserved, everything goes into it. Otherwise we rather start several |
| 4708 | * smaller transactions for conversion of each extent separately. |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4709 | */ |
Jan Kara | 6b523df | 2013-06-04 13:21:11 -0400 | [diff] [blame] | 4710 | if (handle) { |
| 4711 | handle = ext4_journal_start_reserved(handle, |
| 4712 | EXT4_HT_EXT_CONVERT); |
| 4713 | if (IS_ERR(handle)) |
| 4714 | return PTR_ERR(handle); |
| 4715 | credits = 0; |
| 4716 | } else { |
| 4717 | /* |
| 4718 | * credits to insert 1 extent into extent tree |
| 4719 | */ |
| 4720 | credits = ext4_chunk_trans_blocks(inode, max_blocks); |
| 4721 | } |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4722 | while (ret >= 0 && ret < max_blocks) { |
Theodore Ts'o | 2ed8868 | 2010-05-16 20:00:00 -0400 | [diff] [blame] | 4723 | map.m_lblk += ret; |
| 4724 | map.m_len = (max_blocks -= ret); |
Jan Kara | 6b523df | 2013-06-04 13:21:11 -0400 | [diff] [blame] | 4725 | if (credits) { |
| 4726 | handle = ext4_journal_start(inode, EXT4_HT_MAP_BLOCKS, |
| 4727 | credits); |
| 4728 | if (IS_ERR(handle)) { |
| 4729 | ret = PTR_ERR(handle); |
| 4730 | break; |
| 4731 | } |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4732 | } |
Theodore Ts'o | 2ed8868 | 2010-05-16 20:00:00 -0400 | [diff] [blame] | 4733 | ret = ext4_map_blocks(handle, inode, &map, |
Jiaying Zhang | c7064ef | 2010-03-02 13:28:44 -0500 | [diff] [blame] | 4734 | EXT4_GET_BLOCKS_IO_CONVERT_EXT); |
Lukas Czerner | b06acd3 | 2013-01-28 21:21:12 -0500 | [diff] [blame] | 4735 | if (ret <= 0) |
| 4736 | ext4_warning(inode->i_sb, |
| 4737 | "inode #%lu: block %u: len %u: " |
| 4738 | "ext4_ext_map_blocks returned %d", |
| 4739 | inode->i_ino, map.m_lblk, |
| 4740 | map.m_len, ret); |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4741 | ext4_mark_inode_dirty(handle, inode); |
Jan Kara | 6b523df | 2013-06-04 13:21:11 -0400 | [diff] [blame] | 4742 | if (credits) |
| 4743 | ret2 = ext4_journal_stop(handle); |
| 4744 | if (ret <= 0 || ret2) |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4745 | break; |
| 4746 | } |
Jan Kara | 6b523df | 2013-06-04 13:21:11 -0400 | [diff] [blame] | 4747 | if (!credits) |
| 4748 | ret2 = ext4_journal_stop(handle); |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4749 | return ret > 0 ? ret2 : ret; |
| 4750 | } |
Yongqiang Yang | 6d9c85e | 2011-02-27 17:25:47 -0500 | [diff] [blame] | 4751 | |
Mingming Cao | 0031462 | 2009-09-28 15:49:08 -0400 | [diff] [blame] | 4752 | /* |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 4753 | * If newes is not existing extent (newes->ec_pblk equals zero) find |
| 4754 | * delayed extent at start of newes and update newes accordingly and |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 4755 | * return start of the next delayed extent. |
| 4756 | * |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 4757 | * If newes is existing extent (newes->ec_pblk is not equal zero) |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 4758 | * 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] | 4759 | * extent found. Leave newes unmodified. |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 4760 | */ |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 4761 | static int ext4_find_delayed_extent(struct inode *inode, |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 4762 | struct extent_status *newes) |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 4763 | { |
Zheng Liu | b3aff3e | 2012-11-08 21:57:37 -0500 | [diff] [blame] | 4764 | struct extent_status es; |
Zheng Liu | be40136 | 2013-02-18 00:27:26 -0500 | [diff] [blame] | 4765 | ext4_lblk_t block, next_del; |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 4766 | |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 4767 | if (newes->es_pblk == 0) { |
Yan, Zheng | e30b5dc | 2013-05-03 02:15:52 -0400 | [diff] [blame] | 4768 | ext4_es_find_delayed_extent_range(inode, newes->es_lblk, |
| 4769 | newes->es_lblk + newes->es_len - 1, &es); |
| 4770 | |
Yongqiang Yang | 6d9c85e | 2011-02-27 17:25:47 -0500 | [diff] [blame] | 4771 | /* |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 4772 | * No extent in extent-tree contains block @newes->es_pblk, |
Yongqiang Yang | 6d9c85e | 2011-02-27 17:25:47 -0500 | [diff] [blame] | 4773 | * 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] | 4774 | */ |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 4775 | if (es.es_len == 0) |
Zheng Liu | b3aff3e | 2012-11-08 21:57:37 -0500 | [diff] [blame] | 4776 | /* A hole found. */ |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 4777 | return 0; |
Yongqiang Yang | 6d9c85e | 2011-02-27 17:25:47 -0500 | [diff] [blame] | 4778 | |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 4779 | if (es.es_lblk > newes->es_lblk) { |
Zheng Liu | b3aff3e | 2012-11-08 21:57:37 -0500 | [diff] [blame] | 4780 | /* A hole found. */ |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 4781 | newes->es_len = min(es.es_lblk - newes->es_lblk, |
| 4782 | newes->es_len); |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 4783 | return 0; |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 4784 | } |
Yongqiang Yang | 6d9c85e | 2011-02-27 17:25:47 -0500 | [diff] [blame] | 4785 | |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 4786 | newes->es_len = es.es_lblk + es.es_len - newes->es_lblk; |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 4787 | } |
| 4788 | |
Zheng Liu | 69eb33d | 2013-02-18 00:31:07 -0500 | [diff] [blame] | 4789 | block = newes->es_lblk + newes->es_len; |
Yan, Zheng | e30b5dc | 2013-05-03 02:15:52 -0400 | [diff] [blame] | 4790 | ext4_es_find_delayed_extent_range(inode, block, EXT_MAX_BLOCKS, &es); |
Zheng Liu | be40136 | 2013-02-18 00:27:26 -0500 | [diff] [blame] | 4791 | if (es.es_len == 0) |
| 4792 | next_del = EXT_MAX_BLOCKS; |
| 4793 | else |
| 4794 | next_del = es.es_lblk; |
| 4795 | |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 4796 | return next_del; |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 4797 | } |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 4798 | /* fiemap flags we can handle specified here */ |
| 4799 | #define EXT4_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC|FIEMAP_FLAG_XATTR) |
| 4800 | |
Aneesh Kumar K.V | 3a06d77 | 2008-11-22 15:04:59 -0500 | [diff] [blame] | 4801 | static int ext4_xattr_fiemap(struct inode *inode, |
| 4802 | struct fiemap_extent_info *fieinfo) |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 4803 | { |
| 4804 | __u64 physical = 0; |
| 4805 | __u64 length; |
| 4806 | __u32 flags = FIEMAP_EXTENT_LAST; |
| 4807 | int blockbits = inode->i_sb->s_blocksize_bits; |
| 4808 | int error = 0; |
| 4809 | |
| 4810 | /* in-inode? */ |
Theodore Ts'o | 19f5fb7 | 2010-01-24 14:34:07 -0500 | [diff] [blame] | 4811 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 4812 | struct ext4_iloc iloc; |
| 4813 | int offset; /* offset of xattr in inode */ |
| 4814 | |
| 4815 | error = ext4_get_inode_loc(inode, &iloc); |
| 4816 | if (error) |
| 4817 | return error; |
Jan Kara | a60697f | 2013-05-31 19:38:56 -0400 | [diff] [blame] | 4818 | physical = (__u64)iloc.bh->b_blocknr << blockbits; |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 4819 | offset = EXT4_GOOD_OLD_INODE_SIZE + |
| 4820 | EXT4_I(inode)->i_extra_isize; |
| 4821 | physical += offset; |
| 4822 | length = EXT4_SB(inode->i_sb)->s_inode_size - offset; |
| 4823 | flags |= FIEMAP_EXTENT_DATA_INLINE; |
Curt Wohlgemuth | fd2dd9f | 2010-04-03 17:44:16 -0400 | [diff] [blame] | 4824 | brelse(iloc.bh); |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 4825 | } else { /* external block */ |
Jan Kara | a60697f | 2013-05-31 19:38:56 -0400 | [diff] [blame] | 4826 | physical = (__u64)EXT4_I(inode)->i_file_acl << blockbits; |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 4827 | length = inode->i_sb->s_blocksize; |
| 4828 | } |
| 4829 | |
| 4830 | if (physical) |
| 4831 | error = fiemap_fill_next_extent(fieinfo, 0, physical, |
| 4832 | length, flags); |
| 4833 | return (error < 0 ? error : 0); |
| 4834 | } |
| 4835 | |
| 4836 | int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
| 4837 | __u64 start, __u64 len) |
| 4838 | { |
| 4839 | ext4_lblk_t start_blk; |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 4840 | int error = 0; |
| 4841 | |
Tao Ma | 9419198 | 2012-12-10 14:06:02 -0500 | [diff] [blame] | 4842 | if (ext4_has_inline_data(inode)) { |
| 4843 | int has_inline = 1; |
| 4844 | |
| 4845 | error = ext4_inline_data_fiemap(inode, fieinfo, &has_inline); |
| 4846 | |
| 4847 | if (has_inline) |
| 4848 | return error; |
| 4849 | } |
| 4850 | |
Theodore Ts'o | 7869a4a | 2013-08-16 22:05:14 -0400 | [diff] [blame] | 4851 | if (fieinfo->fi_flags & FIEMAP_FLAG_CACHE) { |
| 4852 | error = ext4_ext_precache(inode); |
| 4853 | if (error) |
| 4854 | return error; |
| 4855 | } |
| 4856 | |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 4857 | /* fallback to generic here if not in extents fmt */ |
Dmitry Monakhov | 12e9b89 | 2010-05-16 22:00:00 -0400 | [diff] [blame] | 4858 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 4859 | return generic_block_fiemap(inode, fieinfo, start, len, |
| 4860 | ext4_get_block); |
| 4861 | |
| 4862 | if (fiemap_check_flags(fieinfo, EXT4_FIEMAP_FLAGS)) |
| 4863 | return -EBADR; |
| 4864 | |
| 4865 | if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) { |
| 4866 | error = ext4_xattr_fiemap(inode, fieinfo); |
| 4867 | } else { |
Leonard Michlmayr | aca92ff | 2010-03-04 17:07:28 -0500 | [diff] [blame] | 4868 | ext4_lblk_t len_blks; |
| 4869 | __u64 last_blk; |
| 4870 | |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 4871 | start_blk = start >> inode->i_sb->s_blocksize_bits; |
Leonard Michlmayr | aca92ff | 2010-03-04 17:07:28 -0500 | [diff] [blame] | 4872 | last_blk = (start + len - 1) >> inode->i_sb->s_blocksize_bits; |
Lukas Czerner | f17722f | 2011-06-06 00:05:17 -0400 | [diff] [blame] | 4873 | if (last_blk >= EXT_MAX_BLOCKS) |
| 4874 | last_blk = EXT_MAX_BLOCKS-1; |
Leonard Michlmayr | aca92ff | 2010-03-04 17:07:28 -0500 | [diff] [blame] | 4875 | len_blks = ((ext4_lblk_t) last_blk) - start_blk + 1; |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 4876 | |
| 4877 | /* |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 4878 | * Walk the extent tree gathering extent information |
| 4879 | * and pushing extents back to the user. |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 4880 | */ |
Lukas Czerner | 91dd8c1 | 2012-11-28 12:32:26 -0500 | [diff] [blame] | 4881 | error = ext4_fill_fiemap_extents(inode, start_blk, |
| 4882 | len_blks, fieinfo); |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 4883 | } |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 4884 | ext4_es_lru_add(inode); |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 4885 | return error; |
| 4886 | } |