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