linux-kernel - RE: [f2fs-dev] [PATCH 3/3] f2fs: use lock

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Message-id: <015101d13248$58a641e0$09f2c5a0$@samsung.com>
Date:	Wed, 09 Dec 2015 14:10:03 +0800
From:	Chao Yu <chao2.yu@...sung.com>
To:	'Jaegeuk Kim' <jaegeuk@...nel.org>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net
Subject: RE: [f2fs-dev] [PATCH 3/3] f2fs: use lock_buffer when changing
	superblock

Hi Jaegeuk,

> -----Original Message-----
> From: Jaegeuk Kim [mailto:jaegeuk@...nel.org]
> Sent: Tuesday, December 08, 2015 6:53 AM
> To: linux-kernel@...r.kernel.org; linux-fsdevel@...r.kernel.org;
> linux-f2fs-devel@...ts.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@...nel.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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