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Commit b0d5fd30 authored by Bob Peterson's avatar Bob Peterson Committed by Steven Whitehouse
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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: default avatarBob Peterson <rpeterso@redhat.com>
Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
parent 398bbe68

fs/gfs2/bmap.c

+7 −7
Original line number Diff line number Diff line
@@ -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);

			}

			set_buffer_new(bh_map);

			goto out_brelse;

		}
@@ -544,6 +542,8 @@ int gfs2_block_map(struct inode *inode, sector_t lblock, 
out_ok:

	error = 0;

out_fail:

	if (dibh)

		brelse(dibh);

	bmap_unlock(inode, create);

	return error;

}