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SubjectRE: [f2fs-dev] [PATCH 3/3] f2fs: use lock_buffer when changing superblock
Date
Hi Jaegeuk,

> -----Original Message-----
> From: Jaegeuk Kim [mailto:jaegeuk@kernel.org]
> Sent: Tuesday, December 08, 2015 6:53 AM
> To: linux-kernel@vger.kernel.org; linux-fsdevel@vger.kernel.org;
> linux-f2fs-devel@lists.sourceforge.net
> Cc: Jaegeuk Kim
> Subject: [f2fs-dev] [PATCH 3/3] f2fs: use lock_buffer when changing superblock
>
> When modifying sb contents, we need to use lock its buffer.

How about applying the rule to _undo_ flow after f2fs_commit_super failed?

Thanks,

>
> Signed-off-by: Jaegeuk Kim <jaegeuk@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 a018ed3..a16dfe9 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -1591,7 +1591,9 @@ static int f2fs_ioc_get_encryption_pwsalt(struct file *filp, unsigned
> long arg)
> return err;
>
> /* update superblock with uuid */
> + lock_buffer(sbi->raw_super_buf);
> generate_random_uuid(sbi->raw_super->encrypt_pw_salt);
> + unlock_buffer(sbi->raw_super_buf);
>
> err = f2fs_commit_super(sbi, false);
>
> --
> 2.4.9 (Apple Git-60)
>
>
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