From: Chao Yu yuchao0@huawei.com
[ Upstream commit 519a5a2f37b850f4eb86674a10d143088670a390 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- fs/f2fs/file.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 8a422400e824d..4ec10256dc67f 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -1836,6 +1836,8 @@ static int f2fs_setflags_common(struct inode *inode, u32 iflags, u32 mask) if (iflags & F2FS_COMPR_FL) { if (!f2fs_may_compress(inode)) return -EINVAL; + if (S_ISREG(inode->i_mode) && inode->i_size) + return -EINVAL;
set_compress_context(inode); }