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-rw-r--r--fs/btrfs/delayed-ref.c114
1 files changed, 0 insertions, 114 deletions
diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c
index bce28f653899..125cf76fcd08 100644
--- a/fs/btrfs/delayed-ref.c
+++ b/fs/btrfs/delayed-ref.c
@@ -281,44 +281,6 @@ again:
}
/*
- * This checks to see if there are any delayed refs in the
- * btree for a given bytenr. It returns one if it finds any
- * and zero otherwise.
- *
- * If it only finds a head node, it returns 0.
- *
- * The idea is to use this when deciding if you can safely delete an
- * extent from the extent allocation tree. There may be a pending
- * ref in the rbtree that adds or removes references, so as long as this
- * returns one you need to leave the BTRFS_EXTENT_ITEM in the extent
- * allocation tree.
- */
-int btrfs_delayed_ref_pending(struct btrfs_trans_handle *trans, u64 bytenr)
-{
- struct btrfs_delayed_ref_node *ref;
- struct btrfs_delayed_ref_root *delayed_refs;
- struct rb_node *prev_node;
- int ret = 0;
-
- delayed_refs = &trans->transaction->delayed_refs;
- spin_lock(&delayed_refs->lock);
-
- ref = find_ref_head(&delayed_refs->root, bytenr, NULL);
- if (ref) {
- prev_node = rb_prev(&ref->rb_node);
- if (!prev_node)
- goto out;
- ref = rb_entry(prev_node, struct btrfs_delayed_ref_node,
- rb_node);
- if (ref->bytenr == bytenr)
- ret = 1;
- }
-out:
- spin_unlock(&delayed_refs->lock);
- return ret;
-}
-
-/*
* helper function to update an extent delayed ref in the
* rbtree. existing and update must both have the same
* bytenr and parent
@@ -747,79 +709,3 @@ btrfs_find_delayed_ref_head(struct btrfs_trans_handle *trans, u64 bytenr)
return btrfs_delayed_node_to_head(ref);
return NULL;
}
-
-/*
- * add a delayed ref to the tree. This does all of the accounting required
- * to make sure the delayed ref is eventually processed before this
- * transaction commits.
- *
- * The main point of this call is to add and remove a backreference in a single
- * shot, taking the lock only once, and only searching for the head node once.
- *
- * It is the same as doing a ref add and delete in two separate calls.
- */
-#if 0
-int btrfs_update_delayed_ref(struct btrfs_trans_handle *trans,
- u64 bytenr, u64 num_bytes, u64 orig_parent,
- u64 parent, u64 orig_ref_root, u64 ref_root,
- u64 orig_ref_generation, u64 ref_generation,
- u64 owner_objectid, int pin)
-{
- struct btrfs_delayed_ref *ref;
- struct btrfs_delayed_ref *old_ref;
- struct btrfs_delayed_ref_head *head_ref;
- struct btrfs_delayed_ref_root *delayed_refs;
- int ret;
-
- ref = kmalloc(sizeof(*ref), GFP_NOFS);
- if (!ref)
- return -ENOMEM;
-
- old_ref = kmalloc(sizeof(*old_ref), GFP_NOFS);
- if (!old_ref) {
- kfree(ref);
- return -ENOMEM;
- }
-
- /*
- * the parent = 0 case comes from cases where we don't actually
- * know the parent yet. It will get updated later via a add/drop
- * pair.
- */
- if (parent == 0)
- parent = bytenr;
- if (orig_parent == 0)
- orig_parent = bytenr;
-
- head_ref = kmalloc(sizeof(*head_ref), GFP_NOFS);
- if (!head_ref) {
- kfree(ref);
- kfree(old_ref);
- return -ENOMEM;
- }
- delayed_refs = &trans->transaction->delayed_refs;
- spin_lock(&delayed_refs->lock);
-
- /*
- * insert both the head node and the new ref without dropping
- * the spin lock
- */
- ret = __btrfs_add_delayed_ref(trans, &head_ref->node, bytenr, num_bytes,
- (u64)-1, 0, 0, 0,
- BTRFS_UPDATE_DELAYED_HEAD, 0);
- BUG_ON(ret);
-
- ret = __btrfs_add_delayed_ref(trans, &ref->node, bytenr, num_bytes,
- parent, ref_root, ref_generation,
- owner_objectid, BTRFS_ADD_DELAYED_REF, 0);
- BUG_ON(ret);
-
- ret = __btrfs_add_delayed_ref(trans, &old_ref->node, bytenr, num_bytes,
- orig_parent, orig_ref_root,
- orig_ref_generation, owner_objectid,
- BTRFS_DROP_DELAYED_REF, pin);
- BUG_ON(ret);
- spin_unlock(&delayed_refs->lock);
- return 0;
-}
-#endif