[XFS] Fix up sparse warnings.

These are mostly locking annotations, marking things static, casts where
needed and declaring stuff in header files.

SGI-PV: 971186
SGI-Modid: xfs-linux-melb:xfs-kern:30002a

Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
diff --git a/fs/xfs/linux-2.6/xfs_ioctl.c b/fs/xfs/linux-2.6/xfs_ioctl.c
index cb2c991..daa351a 100644
--- a/fs/xfs/linux-2.6/xfs_ioctl.c
+++ b/fs/xfs/linux-2.6/xfs_ioctl.c
@@ -512,7 +512,7 @@
 	if (!kbuf)
 		return ENOMEM;
 
-	error = xfs_attr_get(XFS_I(inode), name, kbuf, len, flags, NULL);
+	error = xfs_attr_get(XFS_I(inode), name, kbuf, (int *)len, flags, NULL);
 	if (error)
 		goto out_kfree;