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Btrfs: optimize extent item search in run_delayed_extent_op 

Instead of doing another extent tree search if the first search failed
to find a metadata item, check if the previous item in the leaf is an
extent item and use it if it is, otherwise do the second tree search
for an extent item.

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 2013-10-18 15:42:56 +01:00 committed by Chris Mason
parent cab45e22da
commit 5599488708
1 changed files with 20 additions and 7 deletions
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13
fs/btrfs/extent-tree.c
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@ -2130,16 +2130,29 @@ static int run_delayed_extent_op(struct btrfs_trans_handle *trans,
}
if (ret > 0) {
if (metadata) {
if (path->slots[0] > 0) {
path->slots[0]--;
btrfs_item_key_to_cpu(path->nodes[0], &key,
path->slots[0]);
if (key.objectid == node->bytenr &&
key.type == BTRFS_EXTENT_ITEM_KEY &&
key.offset == node->num_bytes)
ret = 0;
}
if (ret > 0) {
btrfs_release_path(path);
metadata = 0;
key.objectid = node->bytenr;
key.offset = node->num_bytes;
key.type = BTRFS_EXTENT_ITEM_KEY;
goto again;
}
} else {
err = -EIO;
goto out;
}
}
leaf = path->nodes[0];
item_size = btrfs_item_size_nr(leaf, path->slots[0]);