Cleanup the rb_tree merge/insert/update functions, since now we use list
instead of rb_tree now.
Signed-off-by: Qu Wenruo <quwen...@cn.fujitsu.com>
---
fs/btrfs/delayed-ref.c | 174 -------------------------------------------------
1 file changed, 174 deletions(-)
diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c
index 14bd476..4fff260 100644
--- a/fs/btrfs/delayed-ref.c
+++ b/fs/btrfs/delayed-ref.c
@@ -84,87 +84,6 @@ static int comp_data_refs(struct btrfs_delayed_data_ref
*ref2,
return 0;
}
-/*
- * entries in the rb tree are ordered by the byte number of the extent,
- * type of the delayed backrefs and content of delayed backrefs.
- */
-static int comp_entry(struct btrfs_delayed_ref_node *ref2,
- struct btrfs_delayed_ref_node *ref1,
- bool compare_seq)
-{
- if (ref1->bytenr < ref2->bytenr)
- return -1;
- if (ref1->bytenr > ref2->bytenr)
- return 1;
- if (ref1->is_head && ref2->is_head)
- return 0;
- if (ref2->is_head)
- return -1;
- if (ref1->is_head)
- return 1;
- if (ref1->type < ref2->type)
- return -1;
- if (ref1->type > ref2->type)
- return 1;
- if (ref1->no_quota > ref2->no_quota)
- return 1;
- if (ref1->no_quota < ref2->no_quota)
- return -1;
- /* merging of sequenced refs is not allowed */
- if (compare_seq) {
- if (ref1->seq < ref2->seq)
- return -1;
- if (ref1->seq > ref2->seq)
- return 1;
- }
- if (ref1->type == BTRFS_TREE_BLOCK_REF_KEY ||
- ref1->type == BTRFS_SHARED_BLOCK_REF_KEY) {
- return comp_tree_refs(btrfs_delayed_node_to_tree_ref(ref2),
- btrfs_delayed_node_to_tree_ref(ref1),
- ref1->type);
- } else if (ref1->type == BTRFS_EXTENT_DATA_REF_KEY ||
- ref1->type == BTRFS_SHARED_DATA_REF_KEY) {
- return comp_data_refs(btrfs_delayed_node_to_data_ref(ref2),
- btrfs_delayed_node_to_data_ref(ref1));
- }
- BUG();
- return 0;
-}
-
-/*
- * insert a new ref into the rbtree. This returns any existing refs
- * for the same (bytenr,parent) tuple, or NULL if the new node was properly
- * inserted.
- */
-static struct btrfs_delayed_ref_node *tree_insert(struct rb_root *root,
- struct rb_node *node)
-{
- struct rb_node **p = &root->rb_node;
- struct rb_node *parent_node = NULL;
- struct btrfs_delayed_ref_node *entry;
- struct btrfs_delayed_ref_node *ins;
- int cmp;
-
- ins = rb_entry(node, struct btrfs_delayed_ref_node, rb_node);
- while (*p) {
- parent_node = *p;
- entry = rb_entry(parent_node, struct btrfs_delayed_ref_node,
- rb_node);
-
- cmp = comp_entry(entry, ins, 1);
- if (cmp < 0)
- p = &(*p)->rb_left;
- else if (cmp > 0)
- p = &(*p)->rb_right;
- else
- return entry;
- }
-
- rb_link_node(node, parent_node, p);
- rb_insert_color(node, root);
- return NULL;
-}
-
/* insert a new ref to head ref rbtree */
static struct btrfs_delayed_ref_head *htree_insert(struct rb_root *root,
struct rb_node *node)
@@ -277,57 +196,6 @@ static inline void drop_delayed_ref(struct
btrfs_trans_handle *trans,
trans->delayed_ref_updates--;
}
-static int merge_ref(struct btrfs_trans_handle *trans,
- struct btrfs_delayed_ref_root *delayed_refs,
- struct btrfs_delayed_ref_head *head,
- struct btrfs_delayed_ref_node *ref, u64 seq)
-{
- struct rb_node *node;
- int mod = 0;
- int done = 0;
-
- node = rb_next(&ref->rb_node);
- while (!done && node) {
- struct btrfs_delayed_ref_node *next;
-
- next = rb_entry(node, struct btrfs_delayed_ref_node, rb_node);
- node = rb_next(node);
- if (seq && next->seq >= seq)
- break;
- if (comp_entry(ref, next, 0))
- continue;
-
- if (ref->action == next->action) {
- mod = next->ref_mod;
- } else {
- if (ref->ref_mod < next->ref_mod) {
- struct btrfs_delayed_ref_node *tmp;
-
- tmp = ref;
- ref = next;
- next = tmp;
- done = 1;
- }
- mod = -next->ref_mod;
- }
-
- drop_delayed_ref(trans, delayed_refs, head, next);
- ref->ref_mod += mod;
- if (ref->ref_mod == 0) {
- drop_delayed_ref(trans, delayed_refs, head, ref);
- done = 1;
- } else {
- /*
- * You can't have multiples of the same ref on a tree
- * block.
- */
- WARN_ON(ref->type == BTRFS_TREE_BLOCK_REF_KEY ||
- ref->type == BTRFS_SHARED_BLOCK_REF_KEY);
- }
- }
- return done;
-}
-
int btrfs_check_delayed_seq(struct btrfs_fs_info *fs_info,
struct btrfs_delayed_ref_root *delayed_refs,
u64 seq)
@@ -401,48 +269,6 @@ again:
}
/*
- * helper function to update an extent delayed ref in the
- * rbtree. existing and update must both have the same
- * bytenr and parent
- *
- * This may free existing if the update cancels out whatever
- * operation it was doing.
- */
-static noinline void
-update_existing_ref(struct btrfs_trans_handle *trans,
- struct btrfs_delayed_ref_root *delayed_refs,
- struct btrfs_delayed_ref_head *head,
- struct btrfs_delayed_ref_node *existing,
- struct btrfs_delayed_ref_node *update)
-{
- if (update->action != existing->action) {
- /*
- * this is effectively undoing either an add or a
- * drop. We decrement the ref_mod, and if it goes
- * down to zero we just delete the entry without
- * every changing the extent allocation tree.
- */
- existing->ref_mod--;
- if (existing->ref_mod == 0)
- drop_delayed_ref(trans, delayed_refs, head, existing);
- else
- WARN_ON(existing->type == BTRFS_TREE_BLOCK_REF_KEY ||
- existing->type == BTRFS_SHARED_BLOCK_REF_KEY);
- } else {
- WARN_ON(existing->type == BTRFS_TREE_BLOCK_REF_KEY ||
- existing->type == BTRFS_SHARED_BLOCK_REF_KEY);
- /*
- * the action on the existing ref matches
- * the action on the ref we're trying to add.
- * Bump the ref_mod by one so the backref that
- * is eventually added/removed has the correct
- * reference count
- */
- existing->ref_mod += update->ref_mod;
- }
-}
-
-/*
* Helper to insert the ref_node to the tail or merge with tail.
*
* Return 0 for insert.
--
2.3.4
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