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f2fs: Prevent swap file in LFS mode

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The kernel writes to swap files on f2fs directly without the assistance
of the filesystem. This direct write by kernel can be non-sequential
even when the f2fs is in LFS mode. Such non-sequential write conflicts
with the LFS semantics. Especially when f2fs is set up on zoned block
devices, the non-sequential write causes unaligned write command errors.

To avoid the non-sequential writes to swap files, prevent swap file
activation when the filesystem is in LFS mode.

Fixes: 4969c06a0d ("f2fs: support swap file w/ DIO")
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Cc: stable@vger.kernel.org # v5.10+
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Shin'ichiro Kawasaki 2021-05-10 20:24:44 +09:00 • committed by Jaegeuk Kim
parent cad83c968c
commit d927ccfccb
1 changed files with 6 additions and 0 deletions
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6
fs/f2fs/data.c
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@ -4076,6 +4076,12 @@ static int f2fs_swap_activate(struct swap_info_struct *sis, struct file *file,
if (f2fs_readonly(F2FS_I_SB(inode)->sb))
return -EROFS;
if (f2fs_lfs_mode(F2FS_I_SB(inode))) {
f2fs_err(F2FS_I_SB(inode),
"Swapfile not supported in LFS mode");
return -EINVAL;
}
ret = f2fs_convert_inline_inode(inode);
if (ret)
return ret;