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Btrfs: optimize tree-log.c:count_inode_refs() 

Avoid repeated tree searches by processing all inode ref items in
a leaf at once instead of processing one at a time, followed by a
path release and a tree search for a key with a decremented offset.

Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
Filipe David Borba Manana 2013-10-14 22:49:11 +01:00 committed by Chris Mason
parent 229eed4348
commit e93ae26fe1
1 changed files with 5 additions and 0 deletions
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5
fs/btrfs/tree-log.c
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@ -1312,6 +1312,7 @@ static int count_inode_refs(struct btrfs_root *root,
break;
path->slots[0]--;
}
process_slot:
btrfs_item_key_to_cpu(path->nodes[0], &key,
path->slots[0]);
if (key.objectid != ino ||
@ -1332,6 +1333,10 @@ static int count_inode_refs(struct btrfs_root *root,
if (key.offset == 0)
break;
if (path->slots[0] > 0) {
path->slots[0]--;
goto process_slot;
}
key.offset--;
btrfs_release_path(path);
}