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[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>
This commit is contained in:
Bob Peterson 2007-12-11 19:16:09 -06:00 committed by Steven Whitehouse
parent 398bbe6832
commit b0d5fd3074
1 changed files with 7 additions and 7 deletions
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14
fs/gfs2/bmap.c
View File

@ -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;
}