Btrfs: make some funcs static
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 4a4f2d8..a696953 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -365,8 +365,9 @@
*
* returns 0 if everything worked, non-zero otherwise.
*/
-int alloc_extent(struct btrfs_root *root, u64 num_blocks, u64 search_start,
- u64 search_end, u64 owner, struct btrfs_key *ins)
+static int alloc_extent(struct btrfs_root *root, u64 num_blocks,
+ u64 search_start, u64 search_end, u64 owner,
+ struct btrfs_key *ins)
{
int ret;
int pending_ret;
@@ -425,7 +426,12 @@
return buf;
}
-int walk_down_tree(struct btrfs_root *root, struct btrfs_path *path, int *level)
+/*
+ * helper function for drop_snapshot, this walks down the tree dropping ref
+ * counts as it goes.
+ */
+static int walk_down_tree(struct btrfs_root *root,
+ struct btrfs_path *path, int *level)
{
struct btrfs_buffer *next;
struct btrfs_buffer *cur;
@@ -437,6 +443,9 @@
BUG_ON(ret);
if (refs > 1)
goto out;
+ /*
+ * walk down to the last node level and free all the leaves
+ */
while(*level > 0) {
cur = path->nodes[*level];
if (path->slots[*level] >=
@@ -467,7 +476,13 @@
return 0;
}
-int walk_up_tree(struct btrfs_root *root, struct btrfs_path *path, int *level)
+/*
+ * helper for dropping snapshots. This walks back up the tree in the path
+ * to find the first node higher up where we haven't yet gone through
+ * all the slots
+ */
+static int walk_up_tree(struct btrfs_root *root, struct btrfs_path *path,
+ int *level)
{
int i;
int slot;
@@ -491,9 +506,15 @@
return 1;
}
+/*
+ * drop the reference count on the tree rooted at 'snap'. This traverses
+ * the tree freeing any blocks that have a ref count of zero after being
+ * decremented.
+ */
int btrfs_drop_snapshot(struct btrfs_root *root, struct btrfs_buffer *snap)
{
- int ret;
+ int ret = 0;;
+ int wret;
int level;
struct btrfs_path path;
int i;
@@ -506,18 +527,22 @@
path.nodes[level] = snap;
path.slots[level] = 0;
while(1) {
- ret = walk_down_tree(root, &path, &level);
- if (ret > 0)
+ wret = walk_down_tree(root, &path, &level);
+ if (wret > 0)
break;
- ret = walk_up_tree(root, &path, &level);
- if (ret > 0)
+ if (wret < 0)
+ ret = wret;
+
+ wret = walk_up_tree(root, &path, &level);
+ if (wret > 0)
break;
+ if (wret < 0)
+ ret = wret;
}
for (i = 0; i <= orig_level; i++) {
if (path.nodes[i]) {
btrfs_block_release(root, path.nodes[i]);
}
}
-
- return 0;
+ return ret;
}