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f2fs: compress: fix to disallow enabling compress on non-empty file

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Compressed inode and normal inode has different layout, so we should
disallow enabling compress on non-empty file to avoid race condition
during inode .i_addr array parsing and updating.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
[Jaegeuk Kim: Fix missing condition]
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2020-09-18 11:03:49 +08:00 committed by Jaegeuk Kim
parent c68d6c8830
commit 519a5a2f37
1 changed files with 2 additions and 0 deletions
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fs/f2fs/file.c
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@ -1821,6 +1821,8 @@ static int f2fs_setflags_common(struct inode *inode, u32 iflags, u32 mask)
if (iflags & F2FS_COMPR_FL) { if (iflags & F2FS_COMPR_FL) {
if (!f2fs_may_compress(inode)) if (!f2fs_may_compress(inode))
return -EINVAL; return -EINVAL;
if (S_ISREG(inode->i_mode) && inode->i_size)
return -EINVAL;
set_compress_context(inode); set_compress_context(inode);
} }