kernel_samsung_a53x/fs/ext4
Zhihao Cheng eb2d9a8577 ext4: dax: fix overflowing extents beyond inode size when partially writing
[ Upstream commit dda898d7ffe85931f9cca6d702a51f33717c501e ]

The dax_iomap_rw() does two things in each iteration: map written blocks
and copy user data to blocks. If the process is killed by user(See signal
handling in dax_iomap_iter()), the copied data will be returned and added
on inode size, which means that the length of written extents may exceed
the inode size, then fsck will fail. An example is given as:

dd if=/dev/urandom of=file bs=4M count=1
 dax_iomap_rw
  iomap_iter // round 1
   ext4_iomap_begin
    ext4_iomap_alloc // allocate 0~2M extents(written flag)
  dax_iomap_iter // copy 2M data
  iomap_iter // round 2
   iomap_iter_advance
    iter->pos += iter->processed // iter->pos = 2M
   ext4_iomap_begin
    ext4_iomap_alloc // allocate 2~4M extents(written flag)
  dax_iomap_iter
   fatal_signal_pending
  done = iter->pos - iocb->ki_pos // done = 2M
 ext4_handle_inode_extension
  ext4_update_inode_size // inode size = 2M

fsck reports: Inode 13, i_size is 2097152, should be 4194304.  Fix?

Fix the problem by truncating extents if the written length is smaller
than expected.

Fixes: 776722e85d3b ("ext4: DAX iomap write support")
CC: stable@vger.kernel.org
Link: https://bugzilla.kernel.org/show_bug.cgi?id=219136
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Link: https://patch.msgid.link/20240809121532.2105494-1-chengzhihao@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-11-23 23:21:47 +01:00
..
acl.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
acl.h ext4: apply umask if ACL support is disabled 2024-11-18 11:43:31 +01:00
balloc.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
bitmap.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
block_validity.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
dir.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ext4.h ext4: Add no_sehash_xattr mount option 2024-11-17 17:43:35 +01:00
ext4_extents.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ext4_jbd2.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ext4_jbd2.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
extents.c ext4: update orig_path in ext4_find_extent() 2024-11-23 23:21:44 +01:00
extents_status.c ext4: fix infinite loop when replaying fast_commit 2024-11-23 23:20:09 +01:00
extents_status.h ext4: make ext4_es_insert_extent() return void 2024-11-18 23:19:51 +01:00
fast_commit.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
fast_commit.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
file.c ext4: dax: fix overflowing extents beyond inode size when partially writing 2024-11-23 23:21:47 +01:00
fsmap.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
fsmap.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
fsync.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
hash.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ialloc.c ext4: avoid negative min_clusters in find_group_orlov() 2024-11-23 23:21:23 +01:00
indirect.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
inline.c ext4: return error on ext4_find_inline_entry 2024-11-23 23:21:23 +01:00
inode-test.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
inode.c ext4: fix incorrect tid assumption in ext4_wait_for_tail_page_commit() 2024-11-23 23:21:44 +01:00
ioctl.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
Kconfig Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
Makefile Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
mballoc.c ext4: clear EXT4_GROUP_INFO_WAS_TRIMMED_BIT even mount with discard 2024-11-23 23:21:23 +01:00
mballoc.h ext4: add two helper functions extent_logical_end() and pa_logical_end() 2024-11-18 10:58:45 +01:00
migrate.c ext4: fix i_data_sem unlock order in ext4_ind_migrate() 2024-11-23 23:21:42 +01:00
mmp.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
move_extent.c ext4: update orig_path in ext4_find_extent() 2024-11-23 23:21:44 +01:00
namei.c ext4: no need to continue when the number of entries is 1 2024-11-23 23:21:43 +01:00
page-io.c ext4: handle redirtying in ext4_bio_write_page() 2024-11-23 23:20:59 +01:00
readpage.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
resize.c ext4: fix corruption during on-line resize 2024-11-19 09:22:34 +01:00
super.c ext4: fix error code saved on super block during file system abort 2024-11-19 14:19:51 +01:00
symlink.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sysfs.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
truncate.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
verity.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
xattr.c ext4: avoid writing unitialized memory to disk in EA inodes 2024-11-23 23:20:10 +01:00
xattr.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
xattr_hurd.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
xattr_security.c ext4: Add no_sehash_xattr mount option 2024-11-17 17:43:35 +01:00
xattr_trusted.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
xattr_user.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00