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From: Brian Foster <bfoster@redhat.com>
To: Dave Chinner <david@fromorbit.com>
Cc: xfs@oss.sgi.com
Subject: Re: [PATCH 5/9] xfs: reinitialise recycled VFS inode correctly
Date: Mon, 8 Feb 2016 10:29:25 -0500	[thread overview]
Message-ID: <20160208152925.GC19597@bfoster.bfoster> (raw)
In-Reply-To: <1454905461-2773-6-git-send-email-david@fromorbit.com>

On Mon, Feb 08, 2016 at 03:24:17PM +1100, Dave Chinner wrote:
> From: Dave Chinner <dchinner@redhat.com>
> 
> Now that we keep certain on-disk information in the VFS inode rather
> than in a separate XFS specific stucture, we have to be careful of
> the VFS code clearing that information when we re-initialise
> reclaimable cached inodes during lookup. If we don't do this, then
> we lose critical information from the inode and that results in
> corruption being detected.
> 
> Signed-off-by: Dave Chinner <dchinner@redhat.com>
> ---

Reviewed-by: Brian Foster <bfoster@redhat.com>

>  fs/xfs/xfs_icache.c | 22 +++++++++++++++++++++-
>  1 file changed, 21 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c
> index 7c26f86..9ca28655 100644
> --- a/fs/xfs/xfs_icache.c
> +++ b/fs/xfs/xfs_icache.c
> @@ -135,6 +135,26 @@ xfs_inode_free(
>  }
>  
>  /*
> + * When we recycle a reclaimable inode, we need to re-initialise the VFS inode
> + * part of the structure. This is made more complex by the fact we store
> + * information about the on-disk values in the VFS inode and so we can't just
> + * overwrite it's values unconditionally. Hence we save the parameters we
> + * need to retain across reinitialisation, and rewrite them into the VFS inode
> + * after resetting it's state even if resetting fails.
> + */
> +static int
> +xfs_reinit_inode(
> +	struct xfs_mount	*mp,
> +	struct inode		*inode)
> +{
> +	int		error;
> +
> +	error = inode_init_always(mp->m_super, inode);
> +
> +	return error;
> +}
> +
> +/*
>   * Check the validity of the inode we just found it the cache
>   */
>  static int
> @@ -208,7 +228,7 @@ xfs_iget_cache_hit(
>  		spin_unlock(&ip->i_flags_lock);
>  		rcu_read_unlock();
>  
> -		error = inode_init_always(mp->m_super, inode);
> +		error = xfs_reinit_inode(mp, inode);
>  		if (error) {
>  			/*
>  			 * Re-initializing the inode failed, and we are in deep
> -- 
> 2.5.0
> 
> _______________________________________________
> xfs mailing list
> xfs@oss.sgi.com
> http://oss.sgi.com/mailman/listinfo/xfs

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  parent reply	other threads:[~2016-02-08 15:29 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-02-08  4:24 [PATCH v3 0/9] xfs: gut the struct xfs_icdinode Dave Chinner
2016-02-08  4:24 ` [PATCH 1/9] xfs: introduce inode log format object Dave Chinner
2016-02-08  9:23   ` Christoph Hellwig
2016-02-08 19:28     ` Dave Chinner
2016-02-08  4:24 ` [PATCH 2/9] xfs: remove timestamps from incore inode Dave Chinner
2016-02-08  9:28   ` Christoph Hellwig
2016-02-08  4:24 ` [PATCH 3/9] xfs: cull unnecessary icdinode fields Dave Chinner
2016-02-08  9:29   ` Christoph Hellwig
2016-02-08 15:29   ` Brian Foster
2016-02-08  4:24 ` [PATCH 4/9] xfs: move v1 inode conversion to xfs_inode_from_disk Dave Chinner
2016-02-08  9:31   ` Christoph Hellwig
2016-02-08 19:44     ` Dave Chinner
2016-02-08  4:24 ` [PATCH 5/9] xfs: reinitialise recycled VFS inode correctly Dave Chinner
2016-02-08  9:33   ` Christoph Hellwig
2016-02-08 15:29   ` Brian Foster [this message]
2016-02-08  4:24 ` [PATCH 6/9] xfs: use vfs inode nlink field everywhere Dave Chinner
2016-02-08  9:40   ` Christoph Hellwig
2016-02-08 19:47     ` Dave Chinner
2016-02-08 15:29   ` Brian Foster
2016-02-08  4:24 ` [PATCH 7/9] xfs: move inode generation count to VFS inode Dave Chinner
2016-02-08  9:40   ` Christoph Hellwig
2016-02-08 15:29   ` Brian Foster
2016-02-08  4:24 ` [PATCH 8/9] xfs: move di_changecount " Dave Chinner
2016-02-08  9:41   ` Christoph Hellwig
2016-02-08  4:24 ` [PATCH 9/9] xfs: mode di_mode to vfs inode Dave Chinner
2016-02-08  9:42   ` Christoph Hellwig
2016-02-08 19:50     ` Dave Chinner
2016-02-08 15:29   ` Brian Foster

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