[GFS2] Only fetch the dinode once in block_map

Function gfs2_block_map was often looking up the disk inode twice.
This optimizes it so that only does it once.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 7 insertions, 7 deletions

diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index 49486029edc2..224114166529 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -469,6 +469,7 @@ int gfs2_block_map(struct inode *inode, sector_t lblock,
         unsigned int maxlen = bh_map->b_size >> inode->i_blkbits;
         struct metapath mp;
         u64 size;
+        struct buffer_head *dibh = NULL;
 
         BUG_ON(maxlen == 0);
 
@@ -499,6 +500,8 @@ int gfs2_block_map(struct inode *inode, sector_t lblock,
         error = gfs2_meta_inode_buffer(ip, &bh);
         if (error)
                 goto out_fail;
+        dibh = bh;
+        get_bh(dibh);
 
         for (x = 0; x < end_of_metadata; x++) {
                 lookup_block(ip, bh, x, &mp, create, &new, &dblock);
@@ -517,13 +520,8 @@ int gfs2_block_map(struct inode *inode, sector_t lblock,
                 if (boundary)
                         set_buffer_boundary(bh_map);
                 if (new) {
-                        struct buffer_head *dibh;
-                        error = gfs2_meta_inode_buffer(ip, &dibh);
-                        if (!error) {
-                                gfs2_trans_add_bh(ip->i_gl, dibh, 1);
-                                gfs2_dinode_out(ip, dibh->b_data);
-                                brelse(dibh);
-                        }
+                        gfs2_trans_add_bh(ip->i_gl, dibh, 1);
+                        gfs2_dinode_out(ip, dibh->b_data);
                         set_buffer_new(bh_map);
                         goto out_brelse;
                 }
@@ -544,6 +542,8 @@ out_brelse:
 out_ok:
         error = 0;
 out_fail:
+        if (dibh)
+                brelse(dibh);
         bmap_unlock(inode, create);
         return error;
 }