btrfs: free block groups after free'ing fs trees

commit 4e19443da1941050b346f8fc4c368aa68413bc88 upstream.

Sometimes when running generic/475 we would trip the
WARN_ON(cache->reserved) check when free'ing the block groups on umount.
This is because sometimes we don't commit the transaction because of IO
errors and thus do not cleanup the tree logs until at umount time.

These blocks are still reserved until they are cleaned up, but they
aren't cleaned up until _after_ we do the free block groups work.  Fix
this by moving the free after free'ing the fs roots, that way all of the
tree logs are cleaned up and we have a properly cleaned fs.  A bunch of
loops of generic/475 confirmed this fixes the problem.

CC: stable@vger.kernel.org # 4.9+
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index e0edfdc9c82bea289b88d320e98147b7a88ef4bf..fc00781441e0dbb39583b1d7d27ff854a5f16792 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -4026,11 +4026,18 @@ void __cold close_ctree(struct btrfs_fs_info *fs_info)
        invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
        btrfs_stop_all_workers(fs_info);
 
-       btrfs_free_block_groups(fs_info);
-
        clear_bit(BTRFS_FS_OPEN, &fs_info->flags);
        free_root_pointers(fs_info, true);
 
+       /*
+        * We must free the block groups after dropping the fs_roots as we could
+        * have had an IO error and have left over tree log blocks that aren't
+        * cleaned up until the fs roots are freed.  This makes the block group
+        * accounting appear to be wrong because there's pending reserved bytes,
+        * so make sure we do the block group cleanup afterwards.
+        */
+       btrfs_free_block_groups(fs_info);
+
        iput(fs_info->btree_inode);
 
 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY