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FROMGIT: f2fs: fix to avoid atomicity corruption of atomic file

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In the case of the following call stack for an atomic file,
FI_DIRTY_INODE is set, but FI_ATOMIC_DIRTIED is not subsequently set.

f2fs_file_write_iter
  f2fs_map_blocks
    f2fs_reserve_new_blocks
      inc_valid_block_count
        __mark_inode_dirty(dquot)
          f2fs_dirty_inode

If FI_ATOMIC_DIRTIED is not set, atomic file can encounter corruption
due to a mismatch between old file size and new data.

To resolve this issue, I changed to set FI_ATOMIC_DIRTIED when
FI_DIRTY_INODE is set. This ensures that FI_DIRTY_INODE, which was
previously cleared by the Writeback thread during the commit atomic, is
set and i_size is updated.

Cc: <stable@vger.kernel.org>
Fixes: fccaa81de87e ("f2fs: prevent atomic file from being dirtied before commit")
Reviewed-by: Sungjong Seo <sj1557.seo@samsung.com>
Reviewed-by: Sunmin Jeong <s_min.jeong@samsung.com>
Signed-off-by: Yeongjin Gil <youngjin.gil@samsung.com>
Reviewed-by: Daeho Jeong <daehojeong@google.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

Bug: 381519582
(cherry picked from commit f098aeba04c9328571567dca45159358a250240c
 https: //git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git dev)
Link: https://lore.kernel.org/linux-f2fs-devel/20250314120651.443184-1-youngjin.gil@samsung.com/
Change-Id: I7ce87dfbc2525ae185ae6c22671e98ecf021b988
This commit is contained in:
Yeongjin Gil
2025-03-14 21:06:51 +09:00
committed by Treehugger Robot
parent f3c4686f77
commit cfa792a776
2 changed files with 5 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
fs/f2fs/inode.c
View File

@@ -33,10 +33,8 @@ void f2fs_mark_inode_dirty_sync(struct inode *inode, bool sync)
if (f2fs_inode_dirtied(inode, sync))
return;
if (f2fs_is_atomic_file(inode)) {
set_inode_flag(inode, FI_ATOMIC_DIRTIED);
if (f2fs_is_atomic_file(inode))
return;
}
mark_inode_dirty_sync(inode);
}

4
fs/f2fs/super.c
View File

@@ -1533,6 +1533,10 @@ int f2fs_inode_dirtied(struct inode *inode, bool sync)
inc_page_count(sbi, F2FS_DIRTY_IMETA);
}
spin_unlock(&sbi->inode_lock[DIRTY_META]);
if (!ret && f2fs_is_atomic_file(inode))
set_inode_flag(inode, FI_ATOMIC_DIRTIED);
return ret;
}