[Ocfs2-devel] [PATCH 01/14] ocfs2: Introduce ocfs2_xa_loc

[Tao Ma <tao.ma@oracle.com>]

Joel Becker wrote:
> On Tue, Sep 01, 2009 at 01:26:54AM -0700, Joel Becker wrote:
>> On Tue, Sep 01, 2009 at 01:32:37PM +0800, Tao Ma wrote:
>>> Joel Becker wrote:
>>>> +static void *ocfs2_xa_block_offset_pointer(struct ocfs2_xa_loc *loc,
>>>> +					   int offset)
>>>> +{
>>>> +	struct buffer_head *bh = loc->xl_storage;
>>>> +
>>>> +	BUG_ON(offset >= bh->b_size);
>>>> +	return bh->b_data + offset;
>>>> +}
>>> It looks that the "offset" is from the start of the buffer, while in
>>> your description above "offset" is from "loc->xl_header". In both
>>> inline and block case, header != buffer_start. xl_size seems to be
>>> against xl_header, so I would guess here you need to change somehow.
>> 	Doh!  That's a bug.  The description matches reality -
>> xe_name_offset is from the start of the header, not the block, right?
>> So this function is just wrong!
> 
> 	What about this delta?
looks good to me.

Regards,
Tao
> 
> Joel
> 
> 
> diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c
> index d485932..abc8043 100644
> --- a/fs/ocfs2/xattr.c
> +++ b/fs/ocfs2/xattr.c
> @@ -1442,6 +1442,7 @@ static void ocfs2_xa_journal_dirty(handle_t *handle, struct ocfs2_xa_loc *loc)
>  /* Give a pointer into the storage for the given offset */
>  static void *ocfs2_xa_offset_pointer(struct ocfs2_xa_loc *loc, int offset)
>  {
> +	BUG_ON(offset >= loc->xl_size);
>  	return loc->xl_ops->xlo_offset_pointer(loc, offset);
>  }
>  
> @@ -1552,10 +1553,7 @@ static void ocfs2_xa_block_journal_dirty(handle_t *handle,
>  static void *ocfs2_xa_block_offset_pointer(struct ocfs2_xa_loc *loc,
>  					   int offset)
>  {
> -	struct buffer_head *bh = loc->xl_storage;
> -
> -	BUG_ON(offset >= bh->b_size);
> -	return bh->b_data + offset;
> +	return (char *)loc->xl_header + offset;
>  }
>  
>  static int ocfs2_xa_block_can_reuse(struct ocfs2_xa_loc *loc,
> @@ -1712,8 +1710,7 @@ static void *ocfs2_xa_bucket_offset_pointer(struct ocfs2_xa_loc *loc,
>  	struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
>  	int block, block_offset;
>  
> -	BUG_ON(offset >= OCFS2_XATTR_BUCKET_SIZE);
> -
> +	/* The header is at the front of the bucket */
>  	block = offset >> loc->xl_inode->i_sb->s_blocksize_bits;
>  	block_offset = offset % loc->xl_inode->i_sb->s_blocksize;
>  
>