linux-kernel - Re: [PATCH] Revert "Btrfs: don't delay inode ref updates during log, replay"

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Date:   Fri, 2 Dec 2016 22:22:55 -0500
From:   Jeff Mahoney <jeffm@...e.com>
To:     Jiri Slaby <jslaby@...e.cz>
Cc:     Chris Mason <clm@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Revert "Btrfs: don't delay inode ref updates during log,
 replay"

Whoops, the [PATCH] line should've specified more clearly:  This only
applies to linux-stable, 3.12.y.

Sorry for any confusion.

-Jeff

On 12/2/16 10:21 PM, Jeff Mahoney wrote:
> This reverts commit 644d10716875b24388680925d6c7502420987bfe.
> 
> The original patch for mainline, 6f8960541b1 (Btrfs: don't delay
> inode ref updates during log replay) lists 1d52c78afbb (Btrfs: try
> not to ENOSPC on log replay) as the only pre-3.18 dependency, but it
> also depends on 67de11769bd (Btrfs: introduce the delayed inode ref
> deletion for the single link inode), which was introduced in 3.14
> and isn't in 3.12.y.
> 
> The -stable commit added the check to btrfs_delayed_update_inode,
> which may look similar to btrfs_delayed_delete_inode_ref, but it's
> only superficial.  The tops of both functions handle typical
> delayed node boilerplate.  The upshot is that the patch is harmless
> since the caller already checks to see if we're doing log recovery,
> so we're not breaking anything.  It should be reverted because it
> makes it appear as if this issue was fixed for users who did
> backport 67de11769bd, when it is not.
> 
> Signed-off-by: Jeff Mahoney <jeffm@...e.com>
> ---
>  fs/btrfs/delayed-inode.c | 8 --------
>  1 file changed, 8 deletions(-)
> 
> diff --git a/fs/btrfs/delayed-inode.c b/fs/btrfs/delayed-inode.c
> index 34f33e1..269ac79 100644
> --- a/fs/btrfs/delayed-inode.c
> +++ b/fs/btrfs/delayed-inode.c
> @@ -1805,14 +1805,6 @@ int btrfs_delayed_update_inode(struct btrfs_trans_handle *trans,
>  	struct btrfs_delayed_node *delayed_node;
>  	int ret = 0;
>  
> -	/*
> -	 * we don't do delayed inode updates during log recovery because it
> -	 * leads to enospc problems.  This means we also can't do
> -	 * delayed inode refs
> -	 */
> -	if (BTRFS_I(inode)->root->fs_info->log_root_recovering)
> -		return -EAGAIN;
> -
>  	delayed_node = btrfs_get_or_create_delayed_node(inode);
>  	if (IS_ERR(delayed_node))
>  		return PTR_ERR(delayed_node);
> 


-- 
Jeff Mahoney
SUSE Labs



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