[Cluster-devel] [PATCH 02/42] libgfs2: allow dir_split_leaf to receive a leaf buffer

[rpeterso@redhat.com <rpeterso@redhat.com>]

From: Bob Peterson <rpeterso@redhat.com>

This is a small performance improvement. Rather than having function
dir_split_leaf read in the leaf to be split, this patch lets the
buffer_head to be passed in from the calling function, which has it
read in anyway.

rhbz#902920
---
 gfs2/libgfs2/fs_ops.c  | 9 ++++-----
 gfs2/libgfs2/libgfs2.h | 2 +-
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/gfs2/libgfs2/fs_ops.c b/gfs2/libgfs2/fs_ops.c
index c1bd6db..bca622a 100644
--- a/gfs2/libgfs2/fs_ops.c
+++ b/gfs2/libgfs2/fs_ops.c
@@ -916,9 +916,10 @@ void gfs2_put_leaf_nr(struct gfs2_inode *dip, uint32_t inx, uint64_t leaf_out)
 	}
 }
 
-void dir_split_leaf(struct gfs2_inode *dip, uint32_t lindex, uint64_t leaf_no)
+void dir_split_leaf(struct gfs2_inode *dip, uint32_t lindex, uint64_t leaf_no,
+		    struct gfs2_buffer_head *obh)
 {
-	struct gfs2_buffer_head *nbh, *obh;
+	struct gfs2_buffer_head *nbh;
 	struct gfs2_leaf *nleaf, *oleaf;
 	struct gfs2_dirent *dent, *prev = NULL, *next = NULL, *new;
 	uint32_t start, len, half_len, divider;
@@ -942,7 +943,6 @@ void dir_split_leaf(struct gfs2_inode *dip, uint32_t lindex, uint64_t leaf_no)
 	nleaf = (struct gfs2_leaf *)nbh->b_data;
 	nleaf->lf_dirent_format = cpu_to_be32(GFS2_FORMAT_DE);
 
-	obh = bread(dip->i_sbd, leaf_no);
 	oleaf = (struct gfs2_leaf *)obh->b_data;
 
 	len = 1 << (dip->i_di.di_depth - be16_to_cpu(oleaf->lf_depth));
@@ -1027,7 +1027,6 @@ void dir_split_leaf(struct gfs2_inode *dip, uint32_t lindex, uint64_t leaf_no)
 	bmodified(dip->i_bh);
 
 	bmodified(obh); /* Need to do this in case nothing was moved */
-	brelse(obh);
 	bmodified(nbh);
 	brelse(nbh);
 }
@@ -1174,8 +1173,8 @@ restart:
 		if (dirent_alloc(dip, bh, len, &dent)) {
 
 			if (be16_to_cpu(leaf->lf_depth) < dip->i_di.di_depth) {
+				dir_split_leaf(dip, lindex, leaf_no, bh);
 				brelse(bh);
-				dir_split_leaf(dip, lindex, leaf_no);
 				goto restart;
 
 			} else if (dip->i_di.di_depth < GFS2_DIR_MAX_DEPTH) {
diff --git a/gfs2/libgfs2/libgfs2.h b/gfs2/libgfs2/libgfs2.h
index 4b012ab..90a131a 100644
--- a/gfs2/libgfs2/libgfs2.h
+++ b/gfs2/libgfs2/libgfs2.h
@@ -470,7 +470,7 @@ extern void gfs2_get_leaf_nr(struct gfs2_inode *dip, uint32_t index,
 			     uint64_t *leaf_out);
 extern void gfs2_put_leaf_nr(struct gfs2_inode *dip, uint32_t inx, uint64_t leaf_out);
 extern void dir_split_leaf(struct gfs2_inode *dip, uint32_t lindex,
-			   uint64_t leaf_no);
+			   uint64_t leaf_no, struct gfs2_buffer_head *obh);
 extern void gfs2_free_block(struct gfs2_sbd *sdp, uint64_t block);
 extern int gfs2_freedi(struct gfs2_sbd *sdp, uint64_t block);
 extern int gfs2_get_leaf(struct gfs2_inode *dip, uint64_t leaf_no,
-- 
1.7.11.7