[PATCH 25/40] btrfs: Rename backref_cache_cleanup() to btrfs_backref_release_cache() and move it to backref.c

Qu Wenruo
2020-03-23T10:25:45Z

Since we're releasing all existing nodes/edges, other than cleanup the
mess after error, "release" is a more proper naming here.

Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/backref.c | 30 ++++++++++++++++++++++++++++++
fs/btrfs/backref.h | 3 +++
fs/btrfs/relocation.c | 32 +-------------------------------
3 files changed, 34 insertions(+), 31 deletions(-)

diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index 0c8950750682..e1bf23b2bbcd 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -2553,3 +2553,33 @@ void btrfs_backref_cleanup_node(struct btrfs_backref_cache *cache,

btrfs_backref_drop_node(cache, node);
}
+
+void btrfs_backref_release_cache(struct btrfs_backref_cache *cache)
+{
+ struct btrfs_backref_node *node;
+ int i;
+
+ while (!list_empty(&cache->detached)) {
+ node = list_entry(cache->detached.next,
+ struct btrfs_backref_node, list);
+ btrfs_backref_cleanup_node(cache, node);
+ }
+
+ while (!list_empty(&cache->leaves)) {
+ node = list_entry(cache->leaves.next,
+ struct btrfs_backref_node, lower);
+ btrfs_backref_cleanup_node(cache, node);
+ }
+
+ cache->last_trans = 0;
+
+ for (i = 0; i < BTRFS_MAX_LEVEL; i++)
+ ASSERT(list_empty(&cache->pending[i]));
+ ASSERT(list_empty(&cache->pending_edge));
+ ASSERT(list_empty(&cache->useless_node));
+ ASSERT(list_empty(&cache->changed));
+ ASSERT(list_empty(&cache->detached));
+ ASSERT(RB_EMPTY_ROOT(&cache->rb_root));
+ ASSERT(!cache->nr_nodes);
+ ASSERT(!cache->nr_edges);
+}
diff --git a/fs/btrfs/backref.h b/fs/btrfs/backref.h
index 068a28c8e37b..60ee191a71fe 100644
--- a/fs/btrfs/backref.h
+++ b/fs/btrfs/backref.h
@@ -358,4 +358,7 @@ static inline void btrfs_backref_drop_node(struct btrfs_backref_cache *tree,
*/
void btrfs_backref_cleanup_node(struct btrfs_backref_cache *cache,
struct btrfs_backref_node *node);
+
+/* Release all nodes/edges from current cache */
+void btrfs_backref_release_cache(struct btrfs_backref_cache *cache);
#endif
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 4c687318f70b..2f241b542f6b 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -182,36 +182,6 @@ static void mapping_tree_init(struct mapping_tree *tree)
spin_lock_init(&tree->lock);
}

-static void backref_cache_cleanup(struct btrfs_backref_cache *cache)
-{
- struct btrfs_backref_node *node;
- int i;
-
- while (!list_empty(&cache->detached)) {
- node = list_entry(cache->detached.next,
- struct btrfs_backref_node, list);
- btrfs_backref_cleanup_node(cache, node);
- }
-
- while (!list_empty(&cache->leaves)) {
- node = list_entry(cache->leaves.next,
- struct btrfs_backref_node, lower);
- btrfs_backref_cleanup_node(cache, node);
- }
-
- cache->last_trans = 0;
-
- for (i = 0; i < BTRFS_MAX_LEVEL; i++)
- ASSERT(list_empty(&cache->pending[i]));
- ASSERT(list_empty(&cache->pending_edge));
- ASSERT(list_empty(&cache->useless_node));
- ASSERT(list_empty(&cache->changed));
- ASSERT(list_empty(&cache->detached));
- ASSERT(RB_EMPTY_ROOT(&cache->rb_root));
- ASSERT(!cache->nr_nodes);
- ASSERT(!cache->nr_edges);
-}
-
static void backref_tree_panic(struct rb_node *rb_node, int errno, u64 bytenr)
{

@@ -4082,7 +4052,7 @@ static noinline_for_stack int relocate_block_group(struct reloc_control *rc)
rc->create_reloc_tree = 0;
set_reloc_control(rc);

- backref_cache_cleanup(&rc->backref_cache);
+ btrfs_backref_release_cache(&rc->backref_cache);
btrfs_block_rsv_release(fs_info, rc->block_rsv, (u64)-1);

err = prepare_to_merge(rc, err);
--
2.25.2