linux-ext4 - Re: [PATCH] ext3: Don't update the superblock in ext3

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Date:	Thu, 19 Nov 2009 17:09:51 +0100
From:	Jan Kara <jack@...e.cz>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	ext4 development <linux-ext4@...r.kernel.org>,
	Jan Kara <jack@...e.cz>
Subject: Re: [PATCH] ext3: Don't update the superblock in ext3_statfs()

On Mon 16-11-09 16:34:51, Eric Sandeen wrote:
> commit a71ce8c6c9bf269b192f352ea555217815cf027e updated ext3_statfs()
> to update the on-disk superblock counters, but modified this buffer
> directly without any journaling of the change.  This is one of the
> accesses that was causing the crc errors in journal replay as seen in
> kernel.org bugzilla #14354.
> 
> The modifications were originally to keep the sb "more" in sync,
> so that a readonly fsck of the device didn't flag this as an
> error (as often), but apparently e2fsprogs deals with this differently
> now, anyway.
> 
> Based on Ted's patch for ext4, which was in turn based on my
> work on that bug and another preliminary patch...
> 
> Signed-off-by: Eric Sandeen <sandeen@...hat.com>
  Thanks. Merged into my tree.

								Honza
> ---
> 
> diff --git a/fs/ext3/super.c b/fs/ext3/super.c
> index 427496c..ca3068f 100644
> --- a/fs/ext3/super.c
> +++ b/fs/ext3/super.c
> @@ -2686,13 +2686,11 @@ static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
> 	buf->f_bsize = sb->s_blocksize;
> 	buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
> 	buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
> -	es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
> 	buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
> 	if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
> 		buf->f_bavail = 0;
> 	buf->f_files = le32_to_cpu(es->s_inodes_count);
> 	buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
> -	es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
> 	buf->f_namelen = EXT3_NAME_LEN;
> 	fsid = le64_to_cpup((void *)es->s_uuid) ^
> 	       le64_to_cpup((void *)es->s_uuid + sizeof(u64));
> 
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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