Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 3 | * linux/fs/ext4/file.c |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 4 | * |
| 5 | * Copyright (C) 1992, 1993, 1994, 1995 |
| 6 | * Remy Card (card@masi.ibp.fr) |
| 7 | * Laboratoire MASI - Institut Blaise Pascal |
| 8 | * Universite Pierre et Marie Curie (Paris VI) |
| 9 | * |
| 10 | * from |
| 11 | * |
| 12 | * linux/fs/minix/file.c |
| 13 | * |
| 14 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 15 | * |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 16 | * ext4 fs regular file handling primitives |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 17 | * |
| 18 | * 64-bit file support on 64-bit platforms by Jakub Jelinek |
| 19 | * (jj@sunsite.ms.mff.cuni.cz) |
| 20 | */ |
| 21 | |
| 22 | #include <linux/time.h> |
| 23 | #include <linux/fs.h> |
Christoph Hellwig | 545052e | 2017-10-01 17:58:54 -0400 | [diff] [blame] | 24 | #include <linux/iomap.h> |
Theodore Ts'o | bc0b0d6 | 2009-06-13 10:09:48 -0400 | [diff] [blame] | 25 | #include <linux/mount.h> |
| 26 | #include <linux/path.h> |
Matthew Wilcox | c94c2ac | 2015-09-08 14:58:40 -0700 | [diff] [blame] | 27 | #include <linux/dax.h> |
Christoph Hellwig | 871a293 | 2010-03-03 09:05:07 -0500 | [diff] [blame] | 28 | #include <linux/quotaops.h> |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 29 | #include <linux/pagevec.h> |
Christoph Hellwig | e2e40f2 | 2015-02-22 08:58:50 -0800 | [diff] [blame] | 30 | #include <linux/uio.h> |
Jan Kara | b8a6176 | 2017-11-01 16:36:45 +0100 | [diff] [blame] | 31 | #include <linux/mman.h> |
Christoph Hellwig | 3dcf545 | 2008-04-29 18:13:32 -0400 | [diff] [blame] | 32 | #include "ext4.h" |
| 33 | #include "ext4_jbd2.h" |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 34 | #include "xattr.h" |
| 35 | #include "acl.h" |
| 36 | |
Jan Kara | 364443c | 2016-11-20 17:36:06 -0500 | [diff] [blame] | 37 | #ifdef CONFIG_FS_DAX |
| 38 | static ssize_t ext4_dax_read_iter(struct kiocb *iocb, struct iov_iter *to) |
| 39 | { |
| 40 | struct inode *inode = file_inode(iocb->ki_filp); |
| 41 | ssize_t ret; |
| 42 | |
Ritesh Harjani | 428bb08 | 2019-12-12 11:25:55 +0530 | [diff] [blame] | 43 | if (iocb->ki_flags & IOCB_NOWAIT) { |
| 44 | if (!inode_trylock_shared(inode)) |
Goldwyn Rodrigues | 728fbc0 | 2017-06-20 07:05:47 -0500 | [diff] [blame] | 45 | return -EAGAIN; |
Ritesh Harjani | 428bb08 | 2019-12-12 11:25:55 +0530 | [diff] [blame] | 46 | } else { |
Goldwyn Rodrigues | 728fbc0 | 2017-06-20 07:05:47 -0500 | [diff] [blame] | 47 | inode_lock_shared(inode); |
| 48 | } |
Jan Kara | 364443c | 2016-11-20 17:36:06 -0500 | [diff] [blame] | 49 | /* |
| 50 | * Recheck under inode lock - at this point we are sure it cannot |
| 51 | * change anymore |
| 52 | */ |
| 53 | if (!IS_DAX(inode)) { |
| 54 | inode_unlock_shared(inode); |
| 55 | /* Fallback to buffered IO in case we cannot support DAX */ |
| 56 | return generic_file_read_iter(iocb, to); |
| 57 | } |
| 58 | ret = dax_iomap_rw(iocb, to, &ext4_iomap_ops); |
| 59 | inode_unlock_shared(inode); |
| 60 | |
| 61 | file_accessed(iocb->ki_filp); |
| 62 | return ret; |
| 63 | } |
| 64 | #endif |
| 65 | |
| 66 | static ssize_t ext4_file_read_iter(struct kiocb *iocb, struct iov_iter *to) |
| 67 | { |
Theodore Ts'o | 0db1ff2 | 2017-02-05 01:28:48 -0500 | [diff] [blame] | 68 | if (unlikely(ext4_forced_shutdown(EXT4_SB(file_inode(iocb->ki_filp)->i_sb)))) |
| 69 | return -EIO; |
| 70 | |
Jan Kara | 364443c | 2016-11-20 17:36:06 -0500 | [diff] [blame] | 71 | if (!iov_iter_count(to)) |
| 72 | return 0; /* skip atime */ |
| 73 | |
| 74 | #ifdef CONFIG_FS_DAX |
| 75 | if (IS_DAX(file_inode(iocb->ki_filp))) |
| 76 | return ext4_dax_read_iter(iocb, to); |
| 77 | #endif |
| 78 | return generic_file_read_iter(iocb, to); |
| 79 | } |
| 80 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 81 | /* |
| 82 | * Called when an inode is released. Note that this is different |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 83 | * from ext4_file_open: open gets called at every open, but release |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 84 | * gets called only when /all/ the files are closed. |
| 85 | */ |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 86 | static int ext4_release_file(struct inode *inode, struct file *filp) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 87 | { |
Theodore Ts'o | 19f5fb7 | 2010-01-24 14:34:07 -0500 | [diff] [blame] | 88 | if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE)) { |
Theodore Ts'o | 7d8f9f7 | 2009-02-24 08:21:14 -0500 | [diff] [blame] | 89 | ext4_alloc_da_blocks(inode); |
Theodore Ts'o | 19f5fb7 | 2010-01-24 14:34:07 -0500 | [diff] [blame] | 90 | ext4_clear_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE); |
Theodore Ts'o | 7d8f9f7 | 2009-02-24 08:21:14 -0500 | [diff] [blame] | 91 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 92 | /* if we are the last writer on the inode, drop the block reservation */ |
| 93 | if ((filp->f_mode & FMODE_WRITE) && |
Aneesh Kumar K.V | d601430 | 2009-03-27 22:36:43 -0400 | [diff] [blame] | 94 | (atomic_read(&inode->i_writecount) == 1) && |
| 95 | !EXT4_I(inode)->i_reserved_data_blocks) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 96 | { |
Aneesh Kumar K.V | 0e855ac | 2008-01-28 23:58:26 -0500 | [diff] [blame] | 97 | down_write(&EXT4_I(inode)->i_data_sem); |
Theodore Ts'o | c2ea3fd | 2008-10-10 09:40:52 -0400 | [diff] [blame] | 98 | ext4_discard_preallocations(inode); |
Aneesh Kumar K.V | 0e855ac | 2008-01-28 23:58:26 -0500 | [diff] [blame] | 99 | up_write(&EXT4_I(inode)->i_data_sem); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 100 | } |
| 101 | if (is_dx(inode) && filp->private_data) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 102 | ext4_htree_free_dir_info(filp->private_data); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 103 | |
| 104 | return 0; |
| 105 | } |
| 106 | |
Stephen Hemminger | c197855 | 2014-05-12 10:50:23 -0400 | [diff] [blame] | 107 | static void ext4_unwritten_wait(struct inode *inode) |
Eric Sandeen | e9e3bce | 2011-02-12 08:17:34 -0500 | [diff] [blame] | 108 | { |
| 109 | wait_queue_head_t *wq = ext4_ioend_wq(inode); |
| 110 | |
Dmitry Monakhov | e27f41e | 2012-09-28 23:24:52 -0400 | [diff] [blame] | 111 | wait_event(*wq, (atomic_read(&EXT4_I(inode)->i_unwritten) == 0)); |
Eric Sandeen | e9e3bce | 2011-02-12 08:17:34 -0500 | [diff] [blame] | 112 | } |
| 113 | |
| 114 | /* |
| 115 | * This tests whether the IO in question is block-aligned or not. |
| 116 | * Ext4 utilizes unwritten extents when hole-filling during direct IO, and they |
| 117 | * are converted to written only after the IO is complete. Until they are |
| 118 | * mapped, these blocks appear as holes, so dio_zero_block() will assume that |
| 119 | * it needs to zero out portions of the start and/or end block. If 2 AIO |
| 120 | * threads are at work on the same unwritten block, they must be synchronized |
| 121 | * or one thread will zero the other's data, causing corruption. |
| 122 | */ |
| 123 | static int |
Al Viro | 9b88416 | 2014-04-17 16:09:22 -0400 | [diff] [blame] | 124 | ext4_unaligned_aio(struct inode *inode, struct iov_iter *from, loff_t pos) |
Eric Sandeen | e9e3bce | 2011-02-12 08:17:34 -0500 | [diff] [blame] | 125 | { |
| 126 | struct super_block *sb = inode->i_sb; |
| 127 | int blockmask = sb->s_blocksize - 1; |
Eric Sandeen | e9e3bce | 2011-02-12 08:17:34 -0500 | [diff] [blame] | 128 | |
Lukas Czerner | 76c9ee6 | 2019-03-14 23:20:25 -0400 | [diff] [blame] | 129 | if (pos >= ALIGN(i_size_read(inode), sb->s_blocksize)) |
Eric Sandeen | e9e3bce | 2011-02-12 08:17:34 -0500 | [diff] [blame] | 130 | return 0; |
| 131 | |
Al Viro | 9b88416 | 2014-04-17 16:09:22 -0400 | [diff] [blame] | 132 | if ((pos | iov_iter_alignment(from)) & blockmask) |
Eric Sandeen | e9e3bce | 2011-02-12 08:17:34 -0500 | [diff] [blame] | 133 | return 1; |
| 134 | |
| 135 | return 0; |
| 136 | } |
| 137 | |
Jan Kara | 213bcd9 | 2016-11-20 17:29:51 -0500 | [diff] [blame] | 138 | /* Is IO overwriting allocated and initialized blocks? */ |
| 139 | static bool ext4_overwrite_io(struct inode *inode, loff_t pos, loff_t len) |
| 140 | { |
| 141 | struct ext4_map_blocks map; |
| 142 | unsigned int blkbits = inode->i_blkbits; |
| 143 | int err, blklen; |
| 144 | |
| 145 | if (pos + len > i_size_read(inode)) |
| 146 | return false; |
| 147 | |
| 148 | map.m_lblk = pos >> blkbits; |
| 149 | map.m_len = EXT4_MAX_BLOCKS(len, pos, blkbits); |
| 150 | blklen = map.m_len; |
| 151 | |
| 152 | err = ext4_map_blocks(NULL, inode, &map, 0); |
| 153 | /* |
| 154 | * 'err==len' means that all of the blocks have been preallocated, |
| 155 | * regardless of whether they have been initialized or not. To exclude |
| 156 | * unwritten extents, we need to check m_flags. |
| 157 | */ |
| 158 | return err == blklen && (map.m_flags & EXT4_MAP_MAPPED); |
| 159 | } |
| 160 | |
| 161 | static ssize_t ext4_write_checks(struct kiocb *iocb, struct iov_iter *from) |
| 162 | { |
| 163 | struct inode *inode = file_inode(iocb->ki_filp); |
| 164 | ssize_t ret; |
| 165 | |
| 166 | ret = generic_write_checks(iocb, from); |
| 167 | if (ret <= 0) |
| 168 | return ret; |
Theodore Ts'o | c9ea462 | 2019-06-09 22:04:33 -0400 | [diff] [blame] | 169 | |
| 170 | if (unlikely(IS_IMMUTABLE(inode))) |
| 171 | return -EPERM; |
| 172 | |
Jan Kara | 213bcd9 | 2016-11-20 17:29:51 -0500 | [diff] [blame] | 173 | /* |
| 174 | * If we have encountered a bitmap-format file, the size limit |
| 175 | * is smaller than s_maxbytes, which is for extent-mapped files. |
| 176 | */ |
| 177 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) { |
| 178 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
| 179 | |
| 180 | if (iocb->ki_pos >= sbi->s_bitmap_maxbytes) |
| 181 | return -EFBIG; |
| 182 | iov_iter_truncate(from, sbi->s_bitmap_maxbytes - iocb->ki_pos); |
| 183 | } |
| 184 | return iov_iter_count(from); |
| 185 | } |
| 186 | |
Jan Kara | 776722e | 2016-11-20 18:09:11 -0500 | [diff] [blame] | 187 | #ifdef CONFIG_FS_DAX |
| 188 | static ssize_t |
| 189 | ext4_dax_write_iter(struct kiocb *iocb, struct iov_iter *from) |
| 190 | { |
| 191 | struct inode *inode = file_inode(iocb->ki_filp); |
| 192 | ssize_t ret; |
Jan Kara | 776722e | 2016-11-20 18:09:11 -0500 | [diff] [blame] | 193 | |
Ritesh Harjani | 428bb08 | 2019-12-12 11:25:55 +0530 | [diff] [blame] | 194 | if (iocb->ki_flags & IOCB_NOWAIT) { |
| 195 | if (!inode_trylock(inode)) |
Goldwyn Rodrigues | 728fbc0 | 2017-06-20 07:05:47 -0500 | [diff] [blame] | 196 | return -EAGAIN; |
Ritesh Harjani | 428bb08 | 2019-12-12 11:25:55 +0530 | [diff] [blame] | 197 | } else { |
Goldwyn Rodrigues | 728fbc0 | 2017-06-20 07:05:47 -0500 | [diff] [blame] | 198 | inode_lock(inode); |
| 199 | } |
Jan Kara | 776722e | 2016-11-20 18:09:11 -0500 | [diff] [blame] | 200 | ret = ext4_write_checks(iocb, from); |
| 201 | if (ret <= 0) |
| 202 | goto out; |
| 203 | ret = file_remove_privs(iocb->ki_filp); |
| 204 | if (ret) |
| 205 | goto out; |
| 206 | ret = file_update_time(iocb->ki_filp); |
| 207 | if (ret) |
| 208 | goto out; |
| 209 | |
Jan Kara | 776722e | 2016-11-20 18:09:11 -0500 | [diff] [blame] | 210 | ret = dax_iomap_rw(iocb, from, &ext4_iomap_ops); |
| 211 | out: |
Christoph Hellwig | ff5462e | 2017-02-08 14:39:27 -0500 | [diff] [blame] | 212 | inode_unlock(inode); |
Jan Kara | 776722e | 2016-11-20 18:09:11 -0500 | [diff] [blame] | 213 | if (ret > 0) |
| 214 | ret = generic_write_sync(iocb, ret); |
| 215 | return ret; |
| 216 | } |
| 217 | #endif |
| 218 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 219 | static ssize_t |
Al Viro | 9b88416 | 2014-04-17 16:09:22 -0400 | [diff] [blame] | 220 | ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 221 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 222 | struct inode *inode = file_inode(iocb->ki_filp); |
Al Viro | 2ba48ce | 2015-04-09 13:52:01 -0400 | [diff] [blame] | 223 | int o_direct = iocb->ki_flags & IOCB_DIRECT; |
Jan Kara | e142d05 | 2016-03-08 22:44:50 -0500 | [diff] [blame] | 224 | int unaligned_aio = 0; |
Theodore Ts'o | 8ad2850 | 2014-04-21 14:26:57 -0400 | [diff] [blame] | 225 | int overwrite = 0; |
Zheng Liu | 8563000 | 2012-05-28 18:06:51 -0400 | [diff] [blame] | 226 | ssize_t ret; |
Theodore Ts'o | 7608e61 | 2014-04-21 14:26:28 -0400 | [diff] [blame] | 227 | |
Theodore Ts'o | 0db1ff2 | 2017-02-05 01:28:48 -0500 | [diff] [blame] | 228 | if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) |
| 229 | return -EIO; |
| 230 | |
Jan Kara | 776722e | 2016-11-20 18:09:11 -0500 | [diff] [blame] | 231 | #ifdef CONFIG_FS_DAX |
| 232 | if (IS_DAX(inode)) |
| 233 | return ext4_dax_write_iter(iocb, from); |
| 234 | #endif |
Christoph Hellwig | 91f9943 | 2017-08-29 16:13:20 +0200 | [diff] [blame] | 235 | if (!o_direct && (iocb->ki_flags & IOCB_NOWAIT)) |
| 236 | return -EOPNOTSUPP; |
Jan Kara | 776722e | 2016-11-20 18:09:11 -0500 | [diff] [blame] | 237 | |
Goldwyn Rodrigues | 728fbc0 | 2017-06-20 07:05:47 -0500 | [diff] [blame] | 238 | if (!inode_trylock(inode)) { |
| 239 | if (iocb->ki_flags & IOCB_NOWAIT) |
| 240 | return -EAGAIN; |
| 241 | inode_lock(inode); |
| 242 | } |
| 243 | |
Jan Kara | 213bcd9 | 2016-11-20 17:29:51 -0500 | [diff] [blame] | 244 | ret = ext4_write_checks(iocb, from); |
Al Viro | 3309dd0 | 2015-04-09 12:55:47 -0400 | [diff] [blame] | 245 | if (ret <= 0) |
Al Viro | e768d7f | 2015-04-07 14:48:22 -0400 | [diff] [blame] | 246 | goto out; |
Theodore Ts'o | f5ccfe1 | 2014-04-21 14:37:52 -0400 | [diff] [blame] | 247 | |
| 248 | /* |
Jan Kara | e142d05 | 2016-03-08 22:44:50 -0500 | [diff] [blame] | 249 | * Unaligned direct AIO must be serialized among each other as zeroing |
| 250 | * of partial blocks of two competing unaligned AIOs can result in data |
| 251 | * corruption. |
| 252 | */ |
| 253 | if (o_direct && ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) && |
| 254 | !is_sync_kiocb(iocb) && |
| 255 | ext4_unaligned_aio(inode, from, iocb->ki_pos)) { |
| 256 | unaligned_aio = 1; |
| 257 | ext4_unwritten_wait(inode); |
| 258 | } |
| 259 | |
Dmitry Monakhov | a41537e | 2014-10-30 10:53:16 -0400 | [diff] [blame] | 260 | iocb->private = &overwrite; |
Jan Kara | 213bcd9 | 2016-11-20 17:29:51 -0500 | [diff] [blame] | 261 | /* Check whether we do a DIO overwrite or not */ |
Goldwyn Rodrigues | 728fbc0 | 2017-06-20 07:05:47 -0500 | [diff] [blame] | 262 | if (o_direct && !unaligned_aio) { |
| 263 | if (ext4_overwrite_io(inode, iocb->ki_pos, iov_iter_count(from))) { |
| 264 | if (ext4_should_dioread_nolock(inode)) |
| 265 | overwrite = 1; |
| 266 | } else if (iocb->ki_flags & IOCB_NOWAIT) { |
| 267 | ret = -EAGAIN; |
| 268 | goto out; |
| 269 | } |
| 270 | } |
Theodore Ts'o | 8ad2850 | 2014-04-21 14:26:57 -0400 | [diff] [blame] | 271 | |
Al Viro | 9b88416 | 2014-04-17 16:09:22 -0400 | [diff] [blame] | 272 | ret = __generic_file_write_iter(iocb, from); |
Lukas Czerner | 0db2412 | 2019-05-10 21:45:33 -0400 | [diff] [blame] | 273 | /* |
| 274 | * Unaligned direct AIO must be the only IO in flight. Otherwise |
| 275 | * overlapping aligned IO after unaligned might result in data |
| 276 | * corruption. |
| 277 | */ |
| 278 | if (ret == -EIOCBQUEUED && unaligned_aio) |
| 279 | ext4_unwritten_wait(inode); |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 280 | inode_unlock(inode); |
Theodore Ts'o | 8ad2850 | 2014-04-21 14:26:57 -0400 | [diff] [blame] | 281 | |
Christoph Hellwig | e259221 | 2016-04-07 08:52:01 -0700 | [diff] [blame] | 282 | if (ret > 0) |
| 283 | ret = generic_write_sync(iocb, ret); |
Theodore Ts'o | 8ad2850 | 2014-04-21 14:26:57 -0400 | [diff] [blame] | 284 | |
Al Viro | e768d7f | 2015-04-07 14:48:22 -0400 | [diff] [blame] | 285 | return ret; |
| 286 | |
| 287 | out: |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 288 | inode_unlock(inode); |
Eric Sandeen | e9e3bce | 2011-02-12 08:17:34 -0500 | [diff] [blame] | 289 | return ret; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 290 | } |
| 291 | |
Ross Zwisler | 923ae0f | 2015-02-16 15:59:38 -0800 | [diff] [blame] | 292 | #ifdef CONFIG_FS_DAX |
Souptick Joarder | 71fe9899 | 2018-05-13 16:01:49 -0400 | [diff] [blame] | 293 | static vm_fault_t ext4_dax_huge_fault(struct vm_fault *vmf, |
Dave Jiang | c791ace | 2017-02-24 14:57:08 -0800 | [diff] [blame] | 294 | enum page_entry_size pe_size) |
Ross Zwisler | 923ae0f | 2015-02-16 15:59:38 -0800 | [diff] [blame] | 295 | { |
Souptick Joarder | 71fe9899 | 2018-05-13 16:01:49 -0400 | [diff] [blame] | 296 | int error = 0; |
| 297 | vm_fault_t result; |
Jan Kara | 2244642 | 2018-01-07 16:41:01 -0500 | [diff] [blame] | 298 | int retries = 0; |
Jan Kara | fb26a1c | 2017-05-12 15:46:54 -0700 | [diff] [blame] | 299 | handle_t *handle = NULL; |
Dave Jiang | 11bac80 | 2017-02-24 14:56:41 -0800 | [diff] [blame] | 300 | struct inode *inode = file_inode(vmf->vma->vm_file); |
Jan Kara | ea3d720 | 2015-12-07 14:28:03 -0500 | [diff] [blame] | 301 | struct super_block *sb = inode->i_sb; |
Randy Dodgen | fd96b8d | 2017-08-24 15:26:01 -0400 | [diff] [blame] | 302 | |
| 303 | /* |
| 304 | * We have to distinguish real writes from writes which will result in a |
| 305 | * COW page; COW writes should *not* poke the journal (the file will not |
| 306 | * be changed). Doing so would cause unintended failures when mounted |
| 307 | * read-only. |
| 308 | * |
| 309 | * We check for VM_SHARED rather than vmf->cow_page since the latter is |
| 310 | * unset for pe_size != PE_SIZE_PTE (i.e. only in do_cow_fault); for |
| 311 | * other sizes, dax_iomap_fault will handle splitting / fallback so that |
| 312 | * we eventually come back with a COW page. |
| 313 | */ |
| 314 | bool write = (vmf->flags & FAULT_FLAG_WRITE) && |
| 315 | (vmf->vma->vm_flags & VM_SHARED); |
Jan Kara | b8a6176 | 2017-11-01 16:36:45 +0100 | [diff] [blame] | 316 | pfn_t pfn; |
Matthew Wilcox | 01a33b4 | 2015-09-08 14:59:22 -0700 | [diff] [blame] | 317 | |
| 318 | if (write) { |
| 319 | sb_start_pagefault(sb); |
Dave Jiang | 11bac80 | 2017-02-24 14:56:41 -0800 | [diff] [blame] | 320 | file_update_time(vmf->vma->vm_file); |
Jan Kara | fb26a1c | 2017-05-12 15:46:54 -0700 | [diff] [blame] | 321 | down_read(&EXT4_I(inode)->i_mmap_sem); |
Jan Kara | 2244642 | 2018-01-07 16:41:01 -0500 | [diff] [blame] | 322 | retry: |
Jan Kara | fb26a1c | 2017-05-12 15:46:54 -0700 | [diff] [blame] | 323 | handle = ext4_journal_start_sb(sb, EXT4_HT_WRITE_PAGE, |
| 324 | EXT4_DATA_TRANS_BLOCKS(sb)); |
Jan Kara | 497f692 | 2017-11-01 16:36:44 +0100 | [diff] [blame] | 325 | if (IS_ERR(handle)) { |
| 326 | up_read(&EXT4_I(inode)->i_mmap_sem); |
| 327 | sb_end_pagefault(sb); |
| 328 | return VM_FAULT_SIGBUS; |
| 329 | } |
Jan Kara | fb26a1c | 2017-05-12 15:46:54 -0700 | [diff] [blame] | 330 | } else { |
| 331 | down_read(&EXT4_I(inode)->i_mmap_sem); |
Jan Kara | 1db1754 | 2016-10-21 11:33:49 +0200 | [diff] [blame] | 332 | } |
Jan Kara | 2244642 | 2018-01-07 16:41:01 -0500 | [diff] [blame] | 333 | result = dax_iomap_fault(vmf, pe_size, &pfn, &error, &ext4_iomap_ops); |
Jan Kara | fb26a1c | 2017-05-12 15:46:54 -0700 | [diff] [blame] | 334 | if (write) { |
Jan Kara | 497f692 | 2017-11-01 16:36:44 +0100 | [diff] [blame] | 335 | ext4_journal_stop(handle); |
Jan Kara | 2244642 | 2018-01-07 16:41:01 -0500 | [diff] [blame] | 336 | |
| 337 | if ((result & VM_FAULT_ERROR) && error == -ENOSPC && |
| 338 | ext4_should_retry_alloc(sb, &retries)) |
| 339 | goto retry; |
Jan Kara | b8a6176 | 2017-11-01 16:36:45 +0100 | [diff] [blame] | 340 | /* Handling synchronous page fault? */ |
| 341 | if (result & VM_FAULT_NEEDDSYNC) |
| 342 | result = dax_finish_sync_fault(vmf, pe_size, pfn); |
Jan Kara | fb26a1c | 2017-05-12 15:46:54 -0700 | [diff] [blame] | 343 | up_read(&EXT4_I(inode)->i_mmap_sem); |
Matthew Wilcox | 01a33b4 | 2015-09-08 14:59:22 -0700 | [diff] [blame] | 344 | sb_end_pagefault(sb); |
Jan Kara | fb26a1c | 2017-05-12 15:46:54 -0700 | [diff] [blame] | 345 | } else { |
| 346 | up_read(&EXT4_I(inode)->i_mmap_sem); |
| 347 | } |
Matthew Wilcox | 01a33b4 | 2015-09-08 14:59:22 -0700 | [diff] [blame] | 348 | |
| 349 | return result; |
Ross Zwisler | 923ae0f | 2015-02-16 15:59:38 -0800 | [diff] [blame] | 350 | } |
| 351 | |
Souptick Joarder | 71fe9899 | 2018-05-13 16:01:49 -0400 | [diff] [blame] | 352 | static vm_fault_t ext4_dax_fault(struct vm_fault *vmf) |
Dave Jiang | c791ace | 2017-02-24 14:57:08 -0800 | [diff] [blame] | 353 | { |
| 354 | return ext4_dax_huge_fault(vmf, PE_SIZE_PTE); |
| 355 | } |
| 356 | |
Ross Zwisler | 923ae0f | 2015-02-16 15:59:38 -0800 | [diff] [blame] | 357 | static const struct vm_operations_struct ext4_dax_vm_ops = { |
| 358 | .fault = ext4_dax_fault, |
Dave Jiang | c791ace | 2017-02-24 14:57:08 -0800 | [diff] [blame] | 359 | .huge_fault = ext4_dax_huge_fault, |
Ross Zwisler | 1e9d180 | 2016-02-27 14:01:13 -0500 | [diff] [blame] | 360 | .page_mkwrite = ext4_dax_fault, |
Ross Zwisler | 91d25ba | 2017-09-06 16:18:43 -0700 | [diff] [blame] | 361 | .pfn_mkwrite = ext4_dax_fault, |
Ross Zwisler | 923ae0f | 2015-02-16 15:59:38 -0800 | [diff] [blame] | 362 | }; |
| 363 | #else |
| 364 | #define ext4_dax_vm_ops ext4_file_vm_ops |
| 365 | #endif |
| 366 | |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 367 | static const struct vm_operations_struct ext4_file_vm_ops = { |
Jan Kara | ea3d720 | 2015-12-07 14:28:03 -0500 | [diff] [blame] | 368 | .fault = ext4_filemap_fault, |
Kirill A. Shutemov | f182036 | 2014-04-07 15:37:19 -0700 | [diff] [blame] | 369 | .map_pages = filemap_map_pages, |
Aneesh Kumar K.V | 2e9ee85 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 370 | .page_mkwrite = ext4_page_mkwrite, |
| 371 | }; |
| 372 | |
| 373 | static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma) |
| 374 | { |
Michael Halcrow | c9c7429 | 2015-04-12 00:56:10 -0400 | [diff] [blame] | 375 | struct inode *inode = file->f_mapping->host; |
| 376 | |
Theodore Ts'o | 0db1ff2 | 2017-02-05 01:28:48 -0500 | [diff] [blame] | 377 | if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) |
| 378 | return -EIO; |
| 379 | |
Jan Kara | b8a6176 | 2017-11-01 16:36:45 +0100 | [diff] [blame] | 380 | /* |
| 381 | * We don't support synchronous mappings for non-DAX files. At least |
| 382 | * until someone comes with a sensible use case. |
| 383 | */ |
| 384 | if (!IS_DAX(file_inode(file)) && (vma->vm_flags & VM_SYNC)) |
| 385 | return -EOPNOTSUPP; |
| 386 | |
Aneesh Kumar K.V | 2e9ee85 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 387 | file_accessed(file); |
Ross Zwisler | 923ae0f | 2015-02-16 15:59:38 -0800 | [diff] [blame] | 388 | if (IS_DAX(file_inode(file))) { |
| 389 | vma->vm_ops = &ext4_dax_vm_ops; |
Dave Jiang | e1fb4a0 | 2018-08-17 15:43:40 -0700 | [diff] [blame] | 390 | vma->vm_flags |= VM_HUGEPAGE; |
Ross Zwisler | 923ae0f | 2015-02-16 15:59:38 -0800 | [diff] [blame] | 391 | } else { |
| 392 | vma->vm_ops = &ext4_file_vm_ops; |
| 393 | } |
Aneesh Kumar K.V | 2e9ee85 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 394 | return 0; |
| 395 | } |
| 396 | |
Amir Goldstein | 833a950 | 2018-05-13 22:44:23 -0400 | [diff] [blame] | 397 | static int ext4_sample_last_mounted(struct super_block *sb, |
| 398 | struct vfsmount *mnt) |
Theodore Ts'o | bc0b0d6 | 2009-06-13 10:09:48 -0400 | [diff] [blame] | 399 | { |
Amir Goldstein | 833a950 | 2018-05-13 22:44:23 -0400 | [diff] [blame] | 400 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
Theodore Ts'o | bc0b0d6 | 2009-06-13 10:09:48 -0400 | [diff] [blame] | 401 | struct path path; |
| 402 | char buf[64], *cp; |
Amir Goldstein | 833a950 | 2018-05-13 22:44:23 -0400 | [diff] [blame] | 403 | handle_t *handle; |
| 404 | int err; |
| 405 | |
| 406 | if (likely(sbi->s_mount_flags & EXT4_MF_MNTDIR_SAMPLED)) |
| 407 | return 0; |
| 408 | |
Amir Goldstein | db6516a | 2018-05-13 22:54:44 -0400 | [diff] [blame] | 409 | if (sb_rdonly(sb) || !sb_start_intwrite_trylock(sb)) |
Amir Goldstein | 833a950 | 2018-05-13 22:44:23 -0400 | [diff] [blame] | 410 | return 0; |
| 411 | |
| 412 | sbi->s_mount_flags |= EXT4_MF_MNTDIR_SAMPLED; |
| 413 | /* |
| 414 | * Sample where the filesystem has been mounted and |
| 415 | * store it in the superblock for sysadmin convenience |
| 416 | * when trying to sort through large numbers of block |
| 417 | * devices or filesystem images. |
| 418 | */ |
| 419 | memset(buf, 0, sizeof(buf)); |
| 420 | path.mnt = mnt; |
| 421 | path.dentry = mnt->mnt_root; |
| 422 | cp = d_path(&path, buf, sizeof(buf)); |
Amir Goldstein | db6516a | 2018-05-13 22:54:44 -0400 | [diff] [blame] | 423 | err = 0; |
Amir Goldstein | 833a950 | 2018-05-13 22:44:23 -0400 | [diff] [blame] | 424 | if (IS_ERR(cp)) |
Amir Goldstein | db6516a | 2018-05-13 22:54:44 -0400 | [diff] [blame] | 425 | goto out; |
Amir Goldstein | 833a950 | 2018-05-13 22:44:23 -0400 | [diff] [blame] | 426 | |
| 427 | handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1); |
Amir Goldstein | db6516a | 2018-05-13 22:54:44 -0400 | [diff] [blame] | 428 | err = PTR_ERR(handle); |
Amir Goldstein | 833a950 | 2018-05-13 22:44:23 -0400 | [diff] [blame] | 429 | if (IS_ERR(handle)) |
Amir Goldstein | db6516a | 2018-05-13 22:54:44 -0400 | [diff] [blame] | 430 | goto out; |
Amir Goldstein | 833a950 | 2018-05-13 22:44:23 -0400 | [diff] [blame] | 431 | BUFFER_TRACE(sbi->s_sbh, "get_write_access"); |
| 432 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); |
| 433 | if (err) |
Amir Goldstein | db6516a | 2018-05-13 22:54:44 -0400 | [diff] [blame] | 434 | goto out_journal; |
Amir Goldstein | 833a950 | 2018-05-13 22:44:23 -0400 | [diff] [blame] | 435 | strlcpy(sbi->s_es->s_last_mounted, cp, |
| 436 | sizeof(sbi->s_es->s_last_mounted)); |
| 437 | ext4_handle_dirty_super(handle, sb); |
Amir Goldstein | db6516a | 2018-05-13 22:54:44 -0400 | [diff] [blame] | 438 | out_journal: |
Amir Goldstein | 833a950 | 2018-05-13 22:44:23 -0400 | [diff] [blame] | 439 | ext4_journal_stop(handle); |
Amir Goldstein | db6516a | 2018-05-13 22:54:44 -0400 | [diff] [blame] | 440 | out: |
| 441 | sb_end_intwrite(sb); |
Amir Goldstein | 833a950 | 2018-05-13 22:44:23 -0400 | [diff] [blame] | 442 | return err; |
| 443 | } |
| 444 | |
| 445 | static int ext4_file_open(struct inode * inode, struct file * filp) |
| 446 | { |
Michael Halcrow | c9c7429 | 2015-04-12 00:56:10 -0400 | [diff] [blame] | 447 | int ret; |
Theodore Ts'o | bc0b0d6 | 2009-06-13 10:09:48 -0400 | [diff] [blame] | 448 | |
Theodore Ts'o | 0db1ff2 | 2017-02-05 01:28:48 -0500 | [diff] [blame] | 449 | if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) |
| 450 | return -EIO; |
| 451 | |
Amir Goldstein | 833a950 | 2018-05-13 22:44:23 -0400 | [diff] [blame] | 452 | ret = ext4_sample_last_mounted(inode->i_sb, filp->f_path.mnt); |
| 453 | if (ret) |
| 454 | return ret; |
Miklos Szeredi | 9dd78d8 | 2016-03-26 16:14:41 -0400 | [diff] [blame] | 455 | |
Eric Biggers | 09a5c31 | 2017-10-18 20:21:57 -0400 | [diff] [blame] | 456 | ret = fscrypt_file_open(inode, filp); |
| 457 | if (ret) |
| 458 | return ret; |
| 459 | |
Theodore Ts'o | 8aefcd5 | 2011-01-10 12:29:43 -0500 | [diff] [blame] | 460 | /* |
| 461 | * Set up the jbd2_inode if we are opening the inode for |
| 462 | * writing and the journal is present |
| 463 | */ |
Jan Kara | a361293 | 2013-08-16 21:19:41 -0400 | [diff] [blame] | 464 | if (filp->f_mode & FMODE_WRITE) { |
Michael Halcrow | c9c7429 | 2015-04-12 00:56:10 -0400 | [diff] [blame] | 465 | ret = ext4_inode_attach_jinode(inode); |
Jan Kara | a361293 | 2013-08-16 21:19:41 -0400 | [diff] [blame] | 466 | if (ret < 0) |
| 467 | return ret; |
Theodore Ts'o | 8aefcd5 | 2011-01-10 12:29:43 -0500 | [diff] [blame] | 468 | } |
Goldwyn Rodrigues | 728fbc0 | 2017-06-20 07:05:47 -0500 | [diff] [blame] | 469 | |
Christoph Hellwig | 91f9943 | 2017-08-29 16:13:20 +0200 | [diff] [blame] | 470 | filp->f_mode |= FMODE_NOWAIT; |
Theodore Ts'o | abdd438 | 2015-05-31 13:35:39 -0400 | [diff] [blame] | 471 | return dquot_file_open(inode, filp); |
Theodore Ts'o | bc0b0d6 | 2009-06-13 10:09:48 -0400 | [diff] [blame] | 472 | } |
| 473 | |
Toshiyuki Okajima | e0d10bf | 2010-10-27 21:30:06 -0400 | [diff] [blame] | 474 | /* |
Eric Sandeen | ec7268c | 2012-04-30 13:14:03 -0500 | [diff] [blame] | 475 | * ext4_llseek() handles both block-mapped and extent-mapped maxbytes values |
| 476 | * by calling generic_file_llseek_size() with the appropriate maxbytes |
| 477 | * value for each. |
Toshiyuki Okajima | e0d10bf | 2010-10-27 21:30:06 -0400 | [diff] [blame] | 478 | */ |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 479 | loff_t ext4_llseek(struct file *file, loff_t offset, int whence) |
Toshiyuki Okajima | e0d10bf | 2010-10-27 21:30:06 -0400 | [diff] [blame] | 480 | { |
| 481 | struct inode *inode = file->f_mapping->host; |
| 482 | loff_t maxbytes; |
| 483 | |
| 484 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
| 485 | maxbytes = EXT4_SB(inode->i_sb)->s_bitmap_maxbytes; |
| 486 | else |
| 487 | maxbytes = inode->i_sb->s_maxbytes; |
Toshiyuki Okajima | e0d10bf | 2010-10-27 21:30:06 -0400 | [diff] [blame] | 488 | |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 489 | switch (whence) { |
Christoph Hellwig | 545052e | 2017-10-01 17:58:54 -0400 | [diff] [blame] | 490 | default: |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 491 | return generic_file_llseek_size(file, offset, whence, |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 492 | maxbytes, i_size_read(inode)); |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 493 | case SEEK_HOLE: |
Christoph Hellwig | 545052e | 2017-10-01 17:58:54 -0400 | [diff] [blame] | 494 | inode_lock_shared(inode); |
| 495 | offset = iomap_seek_hole(inode, offset, &ext4_iomap_ops); |
| 496 | inode_unlock_shared(inode); |
| 497 | break; |
| 498 | case SEEK_DATA: |
| 499 | inode_lock_shared(inode); |
| 500 | offset = iomap_seek_data(inode, offset, &ext4_iomap_ops); |
| 501 | inode_unlock_shared(inode); |
| 502 | break; |
Zheng Liu | c8c0df2 | 2012-11-08 21:57:40 -0500 | [diff] [blame] | 503 | } |
| 504 | |
Christoph Hellwig | 545052e | 2017-10-01 17:58:54 -0400 | [diff] [blame] | 505 | if (offset < 0) |
| 506 | return offset; |
| 507 | return vfs_setpos(file, offset, maxbytes); |
Toshiyuki Okajima | e0d10bf | 2010-10-27 21:30:06 -0400 | [diff] [blame] | 508 | } |
| 509 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 510 | const struct file_operations ext4_file_operations = { |
Toshiyuki Okajima | e0d10bf | 2010-10-27 21:30:06 -0400 | [diff] [blame] | 511 | .llseek = ext4_llseek, |
Jan Kara | 364443c | 2016-11-20 17:36:06 -0500 | [diff] [blame] | 512 | .read_iter = ext4_file_read_iter, |
Al Viro | 9b88416 | 2014-04-17 16:09:22 -0400 | [diff] [blame] | 513 | .write_iter = ext4_file_write_iter, |
Andi Kleen | 5cdd7b2 | 2008-04-29 22:03:54 -0400 | [diff] [blame] | 514 | .unlocked_ioctl = ext4_ioctl, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 515 | #ifdef CONFIG_COMPAT |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 516 | .compat_ioctl = ext4_compat_ioctl, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 517 | #endif |
Aneesh Kumar K.V | 2e9ee85 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 518 | .mmap = ext4_file_mmap, |
Jan Kara | b8a6176 | 2017-11-01 16:36:45 +0100 | [diff] [blame] | 519 | .mmap_supported_flags = MAP_SYNC, |
Theodore Ts'o | bc0b0d6 | 2009-06-13 10:09:48 -0400 | [diff] [blame] | 520 | .open = ext4_file_open, |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 521 | .release = ext4_release_file, |
| 522 | .fsync = ext4_sync_file, |
Toshi Kani | dbe6ec8 | 2016-10-07 16:59:59 -0700 | [diff] [blame] | 523 | .get_unmapped_area = thp_get_unmapped_area, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 524 | .splice_read = generic_file_splice_read, |
Al Viro | 8d02076 | 2014-04-05 04:27:08 -0400 | [diff] [blame] | 525 | .splice_write = iter_file_splice_write, |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 526 | .fallocate = ext4_fallocate, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 527 | }; |
| 528 | |
Arjan van de Ven | 754661f | 2007-02-12 00:55:38 -0800 | [diff] [blame] | 529 | const struct inode_operations ext4_file_inode_operations = { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 530 | .setattr = ext4_setattr, |
David Howells | 99652ea | 2017-03-31 18:31:56 +0100 | [diff] [blame] | 531 | .getattr = ext4_file_getattr, |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 532 | .listxattr = ext4_listxattr, |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 533 | .get_acl = ext4_get_acl, |
Christoph Hellwig | 64e178a | 2013-12-20 05:16:44 -0800 | [diff] [blame] | 534 | .set_acl = ext4_set_acl, |
Eric Sandeen | 6873fa0 | 2008-10-07 00:46:36 -0400 | [diff] [blame] | 535 | .fiemap = ext4_fiemap, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 536 | }; |
| 537 | |