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Message-Id: <20210712060924.908202074@linuxfoundation.org>
Date: Mon, 12 Jul 2021 08:01:47 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org,
Shinichiro Kawasaki <shinichiro.kawasaki@....com>,
Chao Yu <yuchao0@...wei.com>, Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [PATCH 5.13 084/800] f2fs: Prevent swap file in LFS mode
From: Shin'ichiro Kawasaki <shinichiro.kawasaki@....com>
commit d927ccfccb009ede24448d69c08b12e7c8a6979b upstream.
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: 4969c06a0d83 ("f2fs: support swap file w/ DIO")
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@....com>
Cc: stable@...r.kernel.org # v5.10+
Reviewed-by: Chao Yu <yuchao0@...wei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
fs/f2fs/data.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -4067,6 +4067,12 @@ static int f2fs_swap_activate(struct swa
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;
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