xfs: fix sparse reported log CRC endian issue

Not a bug as such, just warning noise from the xlog_cksum()
returning a __be32 type when it should be returning a __le32 type.

On Wed, Nov 28, 2012 at 08:30:59AM -0500, Christoph Hellwig wrote:
> But why are we storing the crc field little endian while all other on
> disk formats are big endian? (And yes I realize it might as well have
> been me who did that back in the idea, but I still have no idea why)

Because the CRC always returns the calcuation LE format, even on BE
systems. So rather than always having to byte swap it everywhere and
have all the force casts and anootations for sparse, it seems simpler to
just make it a __le32 everywhere....

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Ben Myers <bpm@sgi.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

fs/xfs/xfs_log.c

@@ -1538,7 +1538,7 @@ xlog_pack_data(
  * This is a little more complicated than it should be because the various
  * headers and the actual data are non-contiguous.
  */
-__be32
+__le32
 xlog_cksum(
 	struct xlog		*log,
 	struct xlog_rec_header	*rhead,

fs/xfs/xfs_log_priv.h

@@ -555,7 +555,7 @@ extern int
 xlog_recover_finish(
 	struct xlog		*log);
 
-extern __be32	 xlog_cksum(struct xlog *log, struct xlog_rec_header *rhead,
+extern __le32	 xlog_cksum(struct xlog *log, struct xlog_rec_header *rhead,
 			    char *dp, int size);
 
 extern kmem_zone_t *xfs_log_ticket_zone;

fs/xfs/xfs_log_recover.c

@@ -3233,15 +3233,15 @@ xlog_unpack_data_crc(
 	xfs_caddr_t		dp,
 	struct xlog		*log)
 {
-	__be32			crc;
+	__le32			crc;
 
 	crc = xlog_cksum(log, rhead, dp, be32_to_cpu(rhead->h_len));
 	if (crc != rhead->h_crc) {
 		if (rhead->h_crc || xfs_sb_version_hascrc(&log->l_mp->m_sb)) {
 			xfs_alert(log->l_mp,
 		"log record CRC mismatch: found 0x%x, expected 0x%x.\n",
-					be32_to_cpu(rhead->h_crc),
-					be32_to_cpu(crc));
+					le32_to_cpu(rhead->h_crc),
+					le32_to_cpu(crc));
 			xfs_hex_dump(dp, 32);
 		}