[PATCH 09/21] xfs: cleanup xfs_imap

[Andrey Albershteyn <aalbersh@kernel.org>]

From: Christoph Hellwig <hch@lst.de>

Source kernel commit: 41397e7ca8a06507ae6f52f68cd27b0812e9a561

Reshuffle the code a bit so that the imap_lookup and filling out of the
xfs_imap structure aren't duplicated.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>
---
 libxfs/xfs_ialloc.c | 62 ++++++++++++++++++++-------------------------
 1 file changed, 28 insertions(+), 34 deletions(-)

diff --git a/libxfs/xfs_ialloc.c b/libxfs/xfs_ialloc.c
index 64f0376a1050..8c42c045924d 100644
--- a/libxfs/xfs_ialloc.c
+++ b/libxfs/xfs_ialloc.c
@@ -2506,43 +2506,37 @@ xfs_imap(
 	 * inodes in stale state on disk. Hence we have to do a btree lookup
 	 * in all cases where an untrusted inode number is passed.
 	 */
-	if (flags & XFS_IGET_UNTRUSTED) {
-		error = xfs_imap_lookup(pag, tp, agino, agbno,
-					&chunk_agbno, &offset_agbno, flags);
-		if (error)
-			return error;
-		goto out_map;
-	}
+	if (!(flags & XFS_IGET_UNTRUSTED)) {
+		/*
+		 * If the inode cluster size is the same or smaller than the
+		 * blocksize, get to the buffer by simple arithmetics.
+		 */
+		if (M_IGEO(mp)->blocks_per_cluster == 1) {
+			cluster_agbno = agbno;
+			offset = XFS_INO_TO_OFFSET(mp, ino);
+			ASSERT(offset < mp->m_sb.sb_inopblock);
+			goto out;
+		}
 
-	/*
-	 * If the inode cluster size is the same as the blocksize or
-	 * smaller we get to the buffer by simple arithmetics.
-	 */
-	if (M_IGEO(mp)->blocks_per_cluster == 1) {
-		offset = XFS_INO_TO_OFFSET(mp, ino);
-		ASSERT(offset < mp->m_sb.sb_inopblock);
+		/*
+		 * If the inode chunks are aligned, use simple maths to find the
+		 * location.
+		 */
+		if (M_IGEO(mp)->inoalign_mask) {
+			offset_agbno = agbno & M_IGEO(mp)->inoalign_mask;
+			chunk_agbno = agbno - offset_agbno;
+			goto out_map;
+		}
 
-		imap->im_blkno = xfs_agbno_to_daddr(pag, agbno);
-		imap->im_len = XFS_FSB_TO_BB(mp, 1);
-		imap->im_boffset = (unsigned short)(offset <<
-							mp->m_sb.sb_inodelog);
-		return 0;
+		/*
+		 * Otherwise we have to do a btree lookup to find the location.
+		 */
 	}
 
-	/*
-	 * If the inode chunks are aligned then use simple maths to
-	 * find the location. Otherwise we have to do a btree
-	 * lookup to find the location.
-	 */
-	if (M_IGEO(mp)->inoalign_mask) {
-		offset_agbno = agbno & M_IGEO(mp)->inoalign_mask;
-		chunk_agbno = agbno - offset_agbno;
-	} else {
-		error = xfs_imap_lookup(pag, tp, agino, agbno,
-					&chunk_agbno, &offset_agbno, flags);
-		if (error)
-			return error;
-	}
+	error = xfs_imap_lookup(pag, tp, agino, agbno, &chunk_agbno,
+			&offset_agbno, flags);
+	if (error)
+		return error;
 
 out_map:
 	ASSERT(agbno >= chunk_agbno);
@@ -2551,7 +2545,7 @@ out_map:
 		 M_IGEO(mp)->blocks_per_cluster);
 	offset = ((agbno - cluster_agbno) * mp->m_sb.sb_inopblock) +
 		XFS_INO_TO_OFFSET(mp, ino);
-
+out:
 	imap->im_blkno = xfs_agbno_to_daddr(pag, cluster_agbno);
 	imap->im_len = XFS_FSB_TO_BB(mp, M_IGEO(mp)->blocks_per_cluster);
 	imap->im_boffset = (unsigned short)(offset << mp->m_sb.sb_inodelog);
-- 
2.55.0