linux-kernel - [PATCH 5.5 160/257] btrfs: reloc: clean dirty subvols if we fail to start a transaction

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Message-Id: <20200416131346.581418690@linuxfoundation.org>
Date:   Thu, 16 Apr 2020 15:23:31 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>
Subject: [PATCH 5.5 160/257] btrfs: reloc: clean dirty subvols if we fail to start a transaction

From: Josef Bacik <josef@...icpanda.com>

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@...r.kernel.org # 5.4+
Signed-off-by: Josef Bacik <josef@...icpanda.com>
Reviewed-by: David Sterba <dsterba@...e.com>
Signed-off-by: David Sterba <dsterba@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/btrfs/relocation.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- 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 btrf
 	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;