Btrfs: don't call free_extent_buffer twice in iterate_irefs

Avoid calling free_extent_buffer more than once when the iterator function
returns non-zero. The only code that uses this is scrub repair for corrupted
nodatasum blocks.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>

diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index b332ff0..fb56bcc 100644 (file)
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -1247,7 +1247,7 @@ static int iterate_irefs(u64 inum, struct btrfs_root *fs_root,
                                struct btrfs_path *path,
                                iterate_irefs_t *iterate, void *ctx)
 {
-       int ret;
+       int ret = 0;
        int slot;
        u32 cur;
        u32 len;
@@ -1259,7 +1259,7 @@ static int iterate_irefs(u64 inum, struct btrfs_root *fs_root,
        struct btrfs_inode_ref *iref;
        struct btrfs_key found_key;
 
-       while (1) {
+       while (!ret) {
                ret = inode_ref_info(inum, parent ? parent+1 : 0, fs_root, path,
                                        &found_key);
                if (ret < 0)
@@ -1288,10 +1288,8 @@ static int iterate_irefs(u64 inum, struct btrfs_root *fs_root,
                                 (unsigned long long)found_key.objectid,
                                 (unsigned long long)fs_root->objectid);
                        ret = iterate(parent, iref, eb, ctx);
-                       if (ret) {
-                               free_extent_buffer(eb);
+                       if (ret)
                                break;
-                       }
                        len = sizeof(*iref) + name_len;
                        iref = (struct btrfs_inode_ref *)((char *)iref + len);
                }