Btrfs: fix memory leak of reloc_root

When some critical errors occur and FS would be flipped into RO,
if we have an on-going balance, we can end up with a memory leak
of root->reloc_root since btrfs_drop_snapshots() bails out
without freeing reloc_root at the very early start.

However, we're not able to free reloc_root in btrfs_drop_snapshots()
because its caller, merge_reloc_roots(), still needs to access it to
cleanup reloc_root's rbtree.

This makes us free reloc_root when we're going to free fs/file roots.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index ff2362d..4a34c9f 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -3744,8 +3744,15 @@ void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
        if (btrfs_root_refs(&root->root_item) == 0)
                synchronize_srcu(&fs_info->subvol_srcu);
 
-       if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state))
+       if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) {
                btrfs_free_log(NULL, root);
+               if (root->reloc_root) {
+                       free_extent_buffer(root->reloc_root->node);
+                       free_extent_buffer(root->reloc_root->commit_root);
+                       btrfs_put_fs_root(root->reloc_root);
+                       root->reloc_root = NULL;
+               }
+       }
 
        if (root->free_ino_pinned)
                __btrfs_remove_free_space_cache(root->free_ino_pinned);