From: Josef Bacik <josef@toxicpanda.com>
Date: Wed, 4 Mar 2020 16:18:27 +0000 (-0500)
Subject: btrfs: reloc: clean dirty subvols if we fail to start a transaction
X-Git-Tag: v5.5.18~102
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=57e658735fd959a49c1b06a3d10340ed2540efd9;p=thirdparty%2Fkernel%2Fstable.git

btrfs: reloc: clean dirty subvols if we fail to start a transaction

commit 6217b0fadd4473a16fabc6aecd7527a9f71af534 upstream.

If we do merge_reloc_roots() we could insert a few roots onto the dirty
subvol roots list, where we hold a ref on them.  If we fail to start the
transaction we need to run clean_dirty_subvols() in order to cleanup the
refs.

CC: stable@vger.kernel.org # 5.4+
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/relocation.c b/fs/btrfs/relocation.c
index ddaefecaa7c42..b976ae4c5fe03 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -4221,10 +4221,10 @@ restart:
 		goto out_free;
 	}
 	btrfs_commit_transaction(trans);
+out_free:
 	ret = clean_dirty_subvols(rc);
 	if (ret < 0 && !err)
 		err = ret;
-out_free:
 	btrfs_free_block_rsv(fs_info, rc->block_rsv);
 	btrfs_free_path(path);
 	return err;
@@ -4622,10 +4622,10 @@ int btrfs_recover_relocation(struct btrfs_root *root)
 	trans = btrfs_join_transaction(rc->extent_root);
 	if (IS_ERR(trans)) {
 		err = PTR_ERR(trans);
-		goto out_free;
+		goto out_clean;
 	}
 	err = btrfs_commit_transaction(trans);
-
+out_clean:
 	ret = clean_dirty_subvols(rc);
 	if (ret < 0 && !err)
 		err = ret;