btrfs: add barrier for waitqueue_active in clear_btree_io_tree
waitqueue_active should be preceded by a barrier, in this function we don't need to call it all the time. Signed-off-by: David Sterba <dsterba@suse.com>
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@ -82,6 +82,12 @@ void btrfs_put_transaction(struct btrfs_transaction *transaction)
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static void clear_btree_io_tree(struct extent_io_tree *tree)
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{
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spin_lock(&tree->lock);
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/*
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* Do a single barrier for the waitqueue_active check here, the state
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* of the waitqueue should not change once clear_btree_io_tree is
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* called.
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*/
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smp_mb();
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while (!RB_EMPTY_ROOT(&tree->state)) {
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struct rb_node *node;
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struct extent_state *state;
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