[PATCH 3/8] btrfs: unset reloc control if we fail to recover

From: Josef Bacik <josef@toxicpanda.com>
To: linux-btrfs@vger.kernel.org, kernel-team@fb.com
Subject: [PATCH 3/8] btrfs: unset reloc control if we fail to recover
Date: Wed,  4 Mar 2020 11:18:25 -0500	[thread overview]
Message-ID: <20200304161830.2360-4-josef@toxicpanda.com> (raw)
In-Reply-To: <20200304161830.2360-1-josef@toxicpanda.com>

If we fail to load an fs root, or fail to start a transaction we can
bail without unsetting the reloc control, which leads to problems later
when we free the reloc control but still have it attached to the file
system.

In the normal path we'll end up calling unset_reloc_control() twice, but
all it does is set fs_info->reloc_control = NULL, and we can only have
one balance at a time so it's not racey.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
---
 fs/btrfs/relocation.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 2141519a9dd0..c496f8ed8c7e 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -4657,9 +4657,8 @@ int btrfs_recover_relocation(struct btrfs_root *root)
 
 	trans = btrfs_join_transaction(rc->extent_root);
 	if (IS_ERR(trans)) {
-		unset_reloc_control(rc);
 		err = PTR_ERR(trans);
-		goto out_free;
+		goto out_unset;
 	}
 
 	rc->merge_reloc_tree = 1;
@@ -4679,7 +4678,7 @@ int btrfs_recover_relocation(struct btrfs_root *root)
 		if (IS_ERR(fs_root)) {
 			err = PTR_ERR(fs_root);
 			list_add_tail(&reloc_root->root_list, &reloc_roots);
-			goto out_free;
+			goto out_unset;
 		}
 
 		err = __add_reloc_root(reloc_root);
@@ -4690,7 +4689,7 @@ int btrfs_recover_relocation(struct btrfs_root *root)
 
 	err = btrfs_commit_transaction(trans);
 	if (err)
-		goto out_free;
+		goto out_unset;
 
 	merge_reloc_roots(rc);
 
@@ -4706,6 +4705,8 @@ int btrfs_recover_relocation(struct btrfs_root *root)
 	ret = clean_dirty_subvols(rc);
 	if (ret < 0 && !err)
 		err = ret;
+out_unset:
+	unset_reloc_control(rc);
 out_free:
 	kfree(rc);
 out:
-- 
2.24.1

