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author | David Sterba <dsterba@suse.cz> | 2011-05-05 12:44:41 +0200 |
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committer | David Sterba <dsterba@suse.cz> | 2011-05-06 12:34:03 +0200 |
commit | f2a97a9dbd86eb1ef956bdf20e05c507b32beb96 (patch) | |
tree | 756c2db8fee9c02df0e3217ea208a82b5f1d5e78 /fs/btrfs/ref-cache.c | |
parent | 621496f4fd56195b7b273521f467c2945165481f (diff) | |
download | linux-f2a97a9dbd86eb1ef956bdf20e05c507b32beb96.tar.gz linux-f2a97a9dbd86eb1ef956bdf20e05c507b32beb96.tar.bz2 linux-f2a97a9dbd86eb1ef956bdf20e05c507b32beb96.zip |
btrfs: remove all unused functions
Remove static and global declarations and/or definitions. Reduces size
of btrfs.ko by ~3.4kB.
text data bss dec hex filename
402081 7464 200 409745 64091 btrfs.ko.base
398620 7144 200 405964 631cc btrfs.ko.remove-all
Signed-off-by: David Sterba <dsterba@suse.cz>
Diffstat (limited to 'fs/btrfs/ref-cache.c')
-rw-r--r-- | fs/btrfs/ref-cache.c | 164 |
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; -} |