linux-kernel - Re: [PATCH] Btrfs: do not ignore errors when truncating the free space cache inode

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Message-ID: <51C10FFA.3010307@cn.fujitsu.com>
Date:	Wed, 19 Jun 2013 09:57:14 +0800
From:	Miao Xie <miaox@...fujitsu.com>
To:	Djalal Harouni <tixxdz@...ndz.org>
CC:	Chris Mason <chris.mason@...ionio.com>,
	Josef Bacik <jbacik@...ionio.com>, linux-btrfs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Btrfs: do not ignore errors when truncating the free
 space cache inode

It was fixed by Wei Yongjun

http://marc.info/?l=linux-btrfs&m=136910396606489&w=2

Thanks
Miao

On tue, 18 Jun 2013 22:57:41 +0100, Djalal Harouni wrote:
> btrfs_check_trunc_cache_free_space() tries to check if there is enough
> space for cache inode truncation but it fails.
> 
> Currently this function always returns success even if there is no
> enough space. Fix this by returning the -ENOSPC error code.
> 
> Signed-off-by: Djalal Harouni <tixxdz@...ndz.org>
> ---
> Totally untested code.
> 
>  fs/btrfs/free-space-cache.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
> index 2750b50..9629830 100644
> --- a/fs/btrfs/free-space-cache.c
> +++ b/fs/btrfs/free-space-cache.c
> @@ -201,7 +201,7 @@ int btrfs_check_trunc_cache_free_space(struct btrfs_root *root,
>  				       struct btrfs_block_rsv *rsv)
>  {
>  	u64 needed_bytes;
> -	int ret;
> +	int ret = 0;
>  
>  	/* 1 for slack space, 1 for updating the inode */
>  	needed_bytes = btrfs_calc_trunc_metadata_size(root, 1) +
> @@ -210,10 +210,10 @@ int btrfs_check_trunc_cache_free_space(struct btrfs_root *root,
>  	spin_lock(&rsv->lock);
>  	if (rsv->reserved < needed_bytes)
>  		ret = -ENOSPC;
> -	else
> -		ret = 0;
> +
>  	spin_unlock(&rsv->lock);
> -	return 0;
> +
> +	return ret;
>  }
>  
>  int btrfs_truncate_free_space_cache(struct btrfs_root *root,
> 

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