xfs: more do_div cleanups

On some architectures do_div does the pointer compare
trick to make sure that we've sent it an unsigned 64-bit
number.  (Why unsigned?  I don't know.)

Fix up the few places that squawk about this; in
xfs_bmap_wants_extents() we just used a bare int64_t so change
that to unsigned.

In xfs_adjust_extent_unmap_boundaries() all we wanted was the
mod, and we have an xfs-specific function to handle that w/o
side effects, which includes proper casting for do_div.

In xfs_daddr_to_ag[b]no, we were using the wrong type anyway;
XFS_BB_TO_FSBT returns a block in the filesystem, so use
xfs_rfsblock_t not xfs_daddr_t, and gain the unsignedness
from that type as a bonus.

Signed-off-by: Eric Sandeen <sandeen@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

@@ -4887,7 +4887,7 @@ xfs_bmap_del_extent_delay(
 	ASSERT(got_endoff >= del_endoff);
 
 	if (isrt) {
-		int64_t rtexts = XFS_FSB_TO_B(mp, del->br_blockcount);
+		uint64_t rtexts = XFS_FSB_TO_B(mp, del->br_blockcount);
 
 		do_div(rtexts, mp->m_sb.sb_rextsize);
 		xfs_mod_frextents(mp, rtexts);

fs/xfs/xfs_bmap_util.c

@@ -1206,11 +1206,8 @@ xfs_adjust_extent_unmap_boundaries(
 		return error;
 
 	if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
-		xfs_daddr_t	block;
-
 		ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
-		block = imap.br_startblock;
-		mod = do_div(block, mp->m_sb.sb_rextsize);
+		mod = do_mod(imap.br_startblock, mp->m_sb.sb_rextsize);
 		if (mod)
 			*startoffset_fsb += mp->m_sb.sb_rextsize - mod;
 	}

fs/xfs/xfs_mount.h

@@ -313,7 +313,7 @@ void xfs_do_force_shutdown(struct xfs_mount *mp, int flags, char *fname,
 static inline xfs_agnumber_t
 xfs_daddr_to_agno(struct xfs_mount *mp, xfs_daddr_t d)
 {
-	xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
+	xfs_rfsblock_t ld = XFS_BB_TO_FSBT(mp, d);
 	do_div(ld, mp->m_sb.sb_agblocks);
 	return (xfs_agnumber_t) ld;
 }
@@ -321,7 +321,7 @@ xfs_daddr_to_agno(struct xfs_mount *mp, xfs_daddr_t d)
 static inline xfs_agblock_t
 xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
 {
-	xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
+	xfs_rfsblock_t ld = XFS_BB_TO_FSBT(mp, d);
 	return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks);
 }