xfs: pass an on-disk extent to xfs_bmbt_validate_extent

This prepares for getting rid of the current in-memory extent format.
At the end of the series we will change the calling convention again
to pass the xfs_bmbt_irec structure once it is available everywhere.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

fs/xfs/libxfs/xfs_bmap.c

@@ -1260,14 +1260,14 @@ xfs_iread_extents(
 		frp = XFS_BMBT_REC_ADDR(mp, block, 1);
 		for (j = 0; j < num_recs; j++, i++, frp++) {
 			xfs_bmbt_rec_host_t *trp = xfs_iext_get_ext(ifp, i);
-			trp->l0 = be64_to_cpu(frp->l0);
-			trp->l1 = be64_to_cpu(frp->l1);
-			if (!xfs_bmbt_validate_extent(mp, whichfork, trp)) {
+			if (!xfs_bmbt_validate_extent(mp, whichfork, frp)) {
 				XFS_ERROR_REPORT("xfs_bmap_read_extents(2)",
 						 XFS_ERRLEVEL_LOW, mp);
 				error = -EFSCORRUPTED;
 				goto out_brelse;
 			}
+			trp->l0 = be64_to_cpu(frp->l0);
+			trp->l1 = be64_to_cpu(frp->l1);
 			trace_xfs_read_extent(ip, i, state, _THIS_IP_);
 		}
 		xfs_trans_brelse(tp, bp);

fs/xfs/libxfs/xfs_bmap_btree.h

@@ -127,9 +127,9 @@ extern struct xfs_btree_cur *xfs_bmbt_init_cursor(struct xfs_mount *,
  * Check that the extent does not contain an invalid unwritten extent flag.
  */
 static inline bool xfs_bmbt_validate_extent(struct xfs_mount *mp, int whichfork,
-		struct xfs_bmbt_rec_host *ep)
+		struct xfs_bmbt_rec *ep)
 {
-	if (ep->l0 >> (64 - BMBT_EXNTFLAG_BITLEN) == 0)
+	if (get_unaligned_be64(&ep->l0) >> (64 - BMBT_EXNTFLAG_BITLEN) == 0)
 		return true;
 	if (whichfork == XFS_DATA_FORK &&
 	    xfs_sb_version_hasextflgbit(&mp->m_sb))

fs/xfs/libxfs/xfs_inode_fork.c

@@ -371,13 +371,13 @@ xfs_iformat_extents(
 		dp = (xfs_bmbt_rec_t *) XFS_DFORK_PTR(dip, whichfork);
 		for (i = 0; i < nex; i++, dp++) {
 			xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, i);
-			ep->l0 = get_unaligned_be64(&dp->l0);
-			ep->l1 = get_unaligned_be64(&dp->l1);
-			if (!xfs_bmbt_validate_extent(mp, whichfork, ep)) {
+			if (!xfs_bmbt_validate_extent(mp, whichfork, dp)) {
 				XFS_ERROR_REPORT("xfs_iformat_extents(2)",
 						 XFS_ERRLEVEL_LOW, mp);
 				return -EFSCORRUPTED;
 			}
+			ep->l0 = get_unaligned_be64(&dp->l0);
+			ep->l1 = get_unaligned_be64(&dp->l1);
 			trace_xfs_read_extent(ip, i, state, _THIS_IP_);
 		}
 	}
@@ -764,8 +764,6 @@ xfs_iextents_copy(
 	for (i = 0; i < nrecs; i++) {
 		xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, i);
 
-		ASSERT(xfs_bmbt_validate_extent(ip->i_mount, whichfork, ep));
-
 		start_block = xfs_bmbt_get_startblock(ep);
 		if (isnullstartblock(start_block)) {
 			/*
@@ -779,6 +777,7 @@ xfs_iextents_copy(
 		/* Translate to on disk format */
 		put_unaligned_be64(ep->l0, &dp->l0);
 		put_unaligned_be64(ep->l1, &dp->l1);
+		ASSERT(xfs_bmbt_validate_extent(ip->i_mount, whichfork, dp));
 
 		dp++;
 		copied++;