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Btrfs: resolve tree mod log locking issue in btrfs_next_leaf 

With the tree mod log, we may end up with two roots (the current root and a
rewinded version of it) both pointing to two leaves, l1 and l2, of which l2
had already been cow-ed in the current transaction. If we don't rewind any
tree blocks, we cannot have two roots both pointing to an already cowed tree
block.

Now there is btrfs_next_leaf, which has a leaf locked and wants a lock on
the next (right) leaf. And there is push_leaf_left, which has a (cowed!)
leaf locked and wants a lock on the previous (left) leaf.

In order to solve this dead lock situation, we use try_lock in
btrfs_next_leaf (only in case it's called with a tree mod log time_seq
paramter) and if we fail to get a lock on the next leaf, we give up our lock
on the current leaf and retry from the very beginning.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
This commit is contained in:
Jan Schmidt 2012-06-22 14:51:15 +02:00
parent 19956c7e94
commit d42244a0d3
1 changed files with 12 additions and 0 deletions
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12
fs/btrfs/ctree.c
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@ -5119,6 +5119,18 @@ again:
if (!path->skip_locking) {
ret = btrfs_try_tree_read_lock(next);
if (!ret && time_seq) {
/*
* If we don't get the lock, we may be racing
* with push_leaf_left, holding that lock while
* itself waiting for the leaf we've currently
* locked. To solve this situation, we give up
* on our lock and cycle.
*/
btrfs_release_path(path);
cond_resched();
goto again;
}
if (!ret) {
btrfs_set_path_blocking(path);
btrfs_tree_read_lock(next);