[Cluster-devel] [PATCH 2/3] gfs2: Split gfs2_indirect_init

[Andreas Gruenbacher <agruenba@redhat.com>]

Function gfs2_indirect_init currently initializes a new indirect block
and sets up the pointer to the new block in the parent indirect block.
This is easier to understand when done in two separate calls.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
 fs/gfs2/bmap.c | 32 +++++++++++++++++++-------------
 1 file changed, 19 insertions(+), 13 deletions(-)

diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index a564cf0b7221..caa0b6d71bce 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -571,22 +571,25 @@ static int gfs2_hole_size(struct inode *inode, sector_t lblock, u64 len,
 	return ret;
 }
 
-static inline __be64 *gfs2_indirect_init(struct metapath *mp,
-					 struct gfs2_glock *gl, unsigned int i,
-					 unsigned offset, u64 bn)
+static void gfs2_indirect_init(struct metapath *mp, struct gfs2_glock *gl,
+			       unsigned int i, u64 bn)
 {
-	__be64 *ptr = (__be64 *)(mp->mp_bh[i - 1]->b_data +
-		       ((i > 1) ? sizeof(struct gfs2_meta_header) :
-				 sizeof(struct gfs2_dinode)));
-	BUG_ON(i < 1);
 	BUG_ON(mp->mp_bh[i] != NULL);
 	mp->mp_bh[i] = gfs2_meta_new(gl, bn);
 	gfs2_trans_add_meta(gl, mp->mp_bh[i]);
 	gfs2_metatype_set(mp->mp_bh[i], GFS2_METATYPE_IN, GFS2_FORMAT_IN);
 	gfs2_buffer_clear_tail(mp->mp_bh[i], sizeof(struct gfs2_meta_header));
+}
+
+static void gfs2_indirect_set(struct metapath *mp, unsigned int i,
+			      unsigned offset, u64 bn)
+{
+	__be64 *ptr = (__be64 *)(mp->mp_bh[i]->b_data +
+		       (i ? sizeof(struct gfs2_meta_header) :
+			    sizeof(struct gfs2_dinode)));
+
 	ptr += offset;
 	*ptr = cpu_to_be64(bn);
-	return ptr;
 }
 
 enum alloc_state {
@@ -688,8 +691,10 @@ static int gfs2_iomap_alloc(struct inode *inode, struct iomap *iomap,
 				zero_bn = *ptr;
 			}
 			for (; i - 1 < mp->mp_fheight - ip->i_height && n > 0;
-			     i++, n--)
-				gfs2_indirect_init(mp, ip->i_gl, i, 0, bn++);
+			     i++, n--, bn++) {
+				gfs2_indirect_init(mp, ip->i_gl, i, bn);
+				gfs2_indirect_set(mp, i - 1, 0, bn);
+			}
 			if (i - 1 == mp->mp_fheight - ip->i_height) {
 				i--;
 				gfs2_buffer_copy_tail(mp->mp_bh[i],
@@ -716,9 +721,10 @@ static int gfs2_iomap_alloc(struct inode *inode, struct iomap *iomap,
 		case ALLOC_GROW_DEPTH:
 			if (i > 1 && i < mp->mp_fheight)
 				gfs2_trans_add_meta(ip->i_gl, mp->mp_bh[i-1]);
-			for (; i < mp->mp_fheight && n > 0; i++, n--)
-				gfs2_indirect_init(mp, ip->i_gl, i,
-						   mp->mp_list[i-1], bn++);
+			for (; i < mp->mp_fheight && n > 0; i++, n--, bn++) {
+				gfs2_indirect_init(mp, ip->i_gl, i, bn);
+				gfs2_indirect_set(mp, i - 1, mp->mp_list[i - 1], bn);
+			}
 			if (i == mp->mp_fheight)
 				state = ALLOC_DATA;
 			if (n == 0)
-- 
2.17.1