linux-kernel - Re: [PATCH] Resolve 'dereferencing pointer to incomplete type' when enabling EXT2_XATTR

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Message-ID: <20110106154317.GL4641@quack.suse.cz>
Date:	Thu, 6 Jan 2011 16:43:17 +0100
From:	Jan Kara <jack@...e.cz>
To:	Josh Hunt <johunt@...mai.com>
Cc:	Jan Kara <jack@...e.cz>, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Resolve 'dereferencing pointer to incomplete type'
 when enabling EXT2_XATTR_DEBUG

On Mon 27-12-10 13:46:38, Josh Hunt wrote:
> When I enable EXT2_XATTR_DEBUG in fs/ext2/xattr.c I get a build error stating
> the following:
> 
>   CC      fs/ext2/xattr.o
> fs/ext2/xattr.c: In function 'ext2_xattr_cache_insert':
> fs/ext2/xattr.c:841: error: dereferencing pointer to incomplete type
> fs/ext2/xattr.c:846: error: dereferencing pointer to incomplete type
> make[2]: *** [fs/ext2/xattr.o] Error 1
> make[1]: *** [fs/ext2] Error 2
> make: *** [fs] Error 2
> 
> These lines reference ext2_xattr_cache->c_entry_count which is defined
> in struct mb_cache. struct mb_cache is currently only defined in fs/mbcache.c.
> Moving struct mb_cache definition to include/linux/mbcache.h to resolve the
> issue.
  Thanks. I've applied the patch.

								Honza

> 
> Signed-off-by: Josh Hunt <johunt@...mai.com>
> ---
>  fs/mbcache.c            |   12 ------------
>  include/linux/mbcache.h |   11 +++++++++++
>  2 files changed, 11 insertions(+), 12 deletions(-)
> 
> diff --git a/fs/mbcache.c b/fs/mbcache.c
> index 9344474..a25444a 100644
> --- a/fs/mbcache.c
> +++ b/fs/mbcache.c
> @@ -76,18 +76,6 @@ EXPORT_SYMBOL(mb_cache_entry_find_first);
>  EXPORT_SYMBOL(mb_cache_entry_find_next);
>  #endif
>  
> -struct mb_cache {
> -	struct list_head		c_cache_list;
> -	const char			*c_name;
> -	atomic_t			c_entry_count;
> -	int				c_max_entries;
> -	int				c_bucket_bits;
> -	struct kmem_cache		*c_entry_cache;
> -	struct list_head		*c_block_hash;
> -	struct list_head		*c_index_hash;
> -};
> -
> -
>  /*
>   * Global data: list of all mbcache's, lru list, and a spinlock for
>   * accessing cache data structures on SMP machines. The lru list is
> diff --git a/include/linux/mbcache.h b/include/linux/mbcache.h
> index 54cbbac..5525d37 100644
> --- a/include/linux/mbcache.h
> +++ b/include/linux/mbcache.h
> @@ -18,6 +18,17 @@ struct mb_cache_entry {
>  	} e_index;
>  };
>  
> +struct mb_cache {
> +	struct list_head		c_cache_list;
> +	const char			*c_name;
> +	atomic_t			c_entry_count;
> +	int				c_max_entries;
> +	int				c_bucket_bits;
> +	struct kmem_cache		*c_entry_cache;
> +	struct list_head		*c_block_hash;
> +	struct list_head		*c_index_hash;
> +};
> +
>  /* Functions on caches */
>  
>  struct mb_cache *mb_cache_create(const char *, int);
> -- 
> 1.7.0.4
> 
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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