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

From: Greg Kroah-Hartman
Date: Thu Apr 16 2020 - 09:55:59 EST


From: Josef Bacik <josef@xxxxxxxxxxxxxx>

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@xxxxxxxxxxxxxxx # 5.4+
Signed-off-by: Josef Bacik <josef@xxxxxxxxxxxxxx>
Reviewed-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
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;