1 files changed, 0 insertions, 164 deletions

diff --git a/fs/btrfs/ref-cache.c b/fs/btrfs/ref-cache.c
index a97314cf6bd6..82d569cb6267 100644
--- a/fs/btrfs/ref-cache.c
+++ b/fs/btrfs/ref-cache.c
@@ -23,56 +23,6 @@
 #include "ref-cache.h"
 #include "transaction.h"
 
-/*
- * leaf refs are used to cache the information about which extents
- * a given leaf has references on.  This allows us to process that leaf
- * in btrfs_drop_snapshot without needing to read it back from disk.
- */
-
-/*
- * kmalloc a leaf reference struct and update the counters for the
- * total ref cache size
- */
-struct btrfs_leaf_ref *btrfs_alloc_leaf_ref(struct btrfs_root *root,
-                                            int nr_extents)
-{
-        struct btrfs_leaf_ref *ref;
-        size_t size = btrfs_leaf_ref_size(nr_extents);
-
-        ref = kmalloc(size, GFP_NOFS);
-        if (ref) {
-                spin_lock(&root->fs_info->ref_cache_lock);
-                root->fs_info->total_ref_cache_size += size;
-                spin_unlock(&root->fs_info->ref_cache_lock);
-
-                memset(ref, 0, sizeof(*ref));
-                atomic_set(&ref->usage, 1);
-                INIT_LIST_HEAD(&ref->list);
-        }
-        return ref;
-}
-
-/*
- * free a leaf reference struct and update the counters for the
- * total ref cache size
- */
-void btrfs_free_leaf_ref(struct btrfs_root *root, struct btrfs_leaf_ref *ref)
-{
-        if (!ref)
-                return;
-        WARN_ON(atomic_read(&ref->usage) == 0);
-        if (atomic_dec_and_test(&ref->usage)) {
-                size_t size = btrfs_leaf_ref_size(ref->nritems);
-
-                BUG_ON(ref->in_tree);
-                kfree(ref);
-
-                spin_lock(&root->fs_info->ref_cache_lock);
-                root->fs_info->total_ref_cache_size -= size;
-                spin_unlock(&root->fs_info->ref_cache_lock);
-        }
-}
-
 static struct rb_node *tree_insert(struct rb_root *root, u64 bytenr,
                                    struct rb_node *node)
 {
@@ -116,117 +66,3 @@ static struct rb_node *tree_search(struct rb_root *root, u64 bytenr)
         }
         return NULL;
 }
-
-int btrfs_remove_leaf_refs(struct btrfs_root *root, u64 max_root_gen,
-                           int shared)
-{
-        struct btrfs_leaf_ref *ref = NULL;
-        struct btrfs_leaf_ref_tree *tree = root->ref_tree;
-
-        if (shared)
-                tree = &root->fs_info->shared_ref_tree;
-        if (!tree)
-                return 0;
-
-        spin_lock(&tree->lock);
-        while (!list_empty(&tree->list)) {
-                ref = list_entry(tree->list.next, struct btrfs_leaf_ref, list);
-                BUG_ON(ref->tree != tree);
-                if (ref->root_gen > max_root_gen)
-                        break;
-                if (!xchg(&ref->in_tree, 0)) {
-                        cond_resched_lock(&tree->lock);
-                        continue;
-                }
-
-                rb_erase(&ref->rb_node, &tree->root);
-                list_del_init(&ref->list);
-
-                spin_unlock(&tree->lock);
-                btrfs_free_leaf_ref(root, ref);
-                cond_resched();
-                spin_lock(&tree->lock);
-        }
-        spin_unlock(&tree->lock);
-        return 0;
-}
-
-/*
- * find the leaf ref for a given extent.  This returns the ref struct with
- * a usage reference incremented
- */
-struct btrfs_leaf_ref *btrfs_lookup_leaf_ref(struct btrfs_root *root,
-                                             u64 bytenr)
-{
-        struct rb_node *rb;
-        struct btrfs_leaf_ref *ref = NULL;
-        struct btrfs_leaf_ref_tree *tree = root->ref_tree;
-again:
-        if (tree) {
-                spin_lock(&tree->lock);
-                rb = tree_search(&tree->root, bytenr);
-                if (rb)
-                        ref = rb_entry(rb, struct btrfs_leaf_ref, rb_node);
-                if (ref)
-                        atomic_inc(&ref->usage);
-                spin_unlock(&tree->lock);
-                if (ref)
-                        return ref;
-        }
-        if (tree != &root->fs_info->shared_ref_tree) {
-                tree = &root->fs_info->shared_ref_tree;
-                goto again;
-        }
-        return NULL;
-}
-
-/*
- * add a fully filled in leaf ref struct
- * remove all the refs older than a given root generation
- */
-int btrfs_add_leaf_ref(struct btrfs_root *root, struct btrfs_leaf_ref *ref,
-                       int shared)
-{
-        int ret = 0;
-        struct rb_node *rb;
-        struct btrfs_leaf_ref_tree *tree = root->ref_tree;
-
-        if (shared)
-                tree = &root->fs_info->shared_ref_tree;
-
-        spin_lock(&tree->lock);
-        rb = tree_insert(&tree->root, ref->bytenr, &ref->rb_node);
-        if (rb) {
-                ret = -EEXIST;
-        } else {
-                atomic_inc(&ref->usage);
-                ref->tree = tree;
-                ref->in_tree = 1;
-                list_add_tail(&ref->list, &tree->list);
-        }
-        spin_unlock(&tree->lock);
-        return ret;
-}
-
-/*
- * remove a single leaf ref from the tree.  This drops the ref held by the tree
- * only
- */
-int btrfs_remove_leaf_ref(struct btrfs_root *root, struct btrfs_leaf_ref *ref)
-{
-        struct btrfs_leaf_ref_tree *tree;
-
-        if (!xchg(&ref->in_tree, 0))
-                return 0;
-
-        tree = ref->tree;
-        spin_lock(&tree->lock);
-
-        rb_erase(&ref->rb_node, &tree->root);
-        list_del_init(&ref->list);
-
-        spin_unlock(&tree->lock);
-
-        btrfs_free_leaf_ref(root, ref);
-        return 0;
-}