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Btrfs: remove unnecessary ref heads rb tree search

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When we didn't find the exact ref head we were looking for, if
return_bigger != 0 we set a new search key to match either the
next node after the last one we found or the first one in the
ref heads rb tree, and then did another full tree search. For both
cases this ended up being pointless as we would end up returning
an entry we already had before repeating the search.

Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
This commit is contained in:
Filipe Manana 2014-02-12 15:07:52 +00:00 committed by Josef Bacik
parent 2c6a92b009
commit 6103fb43fb
1 changed files with 3 additions and 4 deletions
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7
fs/btrfs/delayed-ref.c
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@ -205,7 +205,6 @@ find_ref_head(struct rb_root *root, u64 bytenr,
struct btrfs_delayed_ref_head *entry;
int cmp = 0;
again:
n = root->rb_node;
entry = NULL;
while (n) {
@ -234,9 +233,9 @@ again:
n = rb_first(root);
entry = rb_entry(n, struct btrfs_delayed_ref_head,
href_node);
bytenr = entry->node.bytenr;
return_bigger = 0;
goto again;
if (last)
*last = entry;
return entry;
}
return entry;
}