linux-ext4 - Re: [PATCH 4/4] ext4: don't keep using page if inline conversion fails

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Date:	Thu, 11 Sep 2014 15:17:53 +0200
From:	Jan Kara <jack@...e.cz>
To:	"Darrick J. Wong" <darrick.wong@...cle.com>
Cc:	tytso@....edu, Tao Ma <tm@....ma>, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 4/4] ext4: don't keep using page if inline conversion
 fails

On Wed 10-09-14 17:28:45, Darrick J. Wong wrote:
> If inline->extent conversion fails (most probably due to ENOSPC) and
> we release the temporary page that we allocated to transfer the file
> contents, don't keep using the page pointer after releasing the page.
> This occasionally leads to complaints about evicting locked pages or
> hangs when blocksize > pagesize, because it's possible for the page to
> get reallocated elsewhere in the meantime.
  Good catch! You can add:
Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> 
> Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
> Cc: Tao Ma <tm@....ma>
> ---
>  fs/ext4/inline.c |    4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> 
> diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c
> index bea662b..378aadf 100644
> --- a/fs/ext4/inline.c
> +++ b/fs/ext4/inline.c
> @@ -594,6 +594,7 @@ retry:
>  	if (ret) {
>  		unlock_page(page);
>  		page_cache_release(page);
> +		page = NULL;
>  		ext4_orphan_add(handle, inode);
>  		up_write(&EXT4_I(inode)->xattr_sem);
>  		sem_held = 0;
> @@ -613,7 +614,8 @@ retry:
>  	if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
>  		goto retry;
>  
> -	block_commit_write(page, from, to);
> +	if (page)
> +		block_commit_write(page, from, to);
>  out:
>  	if (page) {
>  		unlock_page(page);
> 
> --
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-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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