Re: [RFC][PATCH 07/10] orangefs: Use RCU for destroy_inode

[Al Viro <viro@ZenIV.linux.org.uk>]

That, AFAICS, fixes a real bug.  Applied, and it needs Cc:stable as well.


> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
> ---
>  fs/orangefs/super.c |    9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> --- a/fs/orangefs/super.c
> +++ b/fs/orangefs/super.c
> @@ -115,6 +115,13 @@ static struct inode *orangefs_alloc_inod
>  	return &orangefs_inode->vfs_inode;
>  }
>  
> +static void orangefs_i_callback(struct rcu_head *head)
> +{
> +	struct inode *inode = container_of(head, struct inode, i_rcu);
> +	struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
> +	kmem_cache_free(orangefs_inode_cache, orangefs_inode);
> +}
> +
>  static void orangefs_destroy_inode(struct inode *inode)
>  {
>  	struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
> @@ -123,7 +130,7 @@ static void orangefs_destroy_inode(struc
>  			"%s: deallocated %p destroying inode %pU\n",
>  			__func__, orangefs_inode, get_khandle_from_ino(inode));
>  
> -	kmem_cache_free(orangefs_inode_cache, orangefs_inode);
> +	call_rcu(&inode->i_rcu, orangefs_i_callback);
>  }
>  
>  /*
> 
>