[PATCH v2] btrfs: abort transaction in do_remap_reloc_trans() on failure

[Mark Harmstone <mark@harmstone.com>]

If one of the calls made by do_remap_reloc_trans() fails, we can leave
the remap tree in an inconsistent state. Abort the transaction if this
happens, to prevent the corrupt state from reaching the disk.

Signed-off-by: Mark Harmstone <mark@harmstone.com>
---
Changed to abort in place, so that line numbers get properly logged,
rather than at the end of the function.

 fs/btrfs/relocation.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index a7cf5d9cf1de0d..6cad6b4064fbea 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -5035,21 +5035,27 @@ static int do_remap_reloc_trans(struct btrfs_fs_info *fs_info,
 
 	if (bg_needs_free_space) {
 		ret = btrfs_add_block_group_free_space(trans, dest_bg);
-		if (ret)
+		if (ret) {
+			btrfs_abort_transaction(trans, ret);
 			goto fail;
+		}
 	}
 
 	ret = copy_remapped_data(fs_info, start, new_addr, length);
-	if (ret)
+	if (ret) {
+		btrfs_abort_transaction(trans, ret);
 		goto fail;
+	}
 
 	ret = btrfs_remove_from_free_space_tree(trans, new_addr, length);
-	if (ret)
+	if (ret) {
+		btrfs_abort_transaction(trans, ret);
 		goto fail;
+	}
 
 	ret = add_remap_entry(trans, path, src_bg, start, new_addr, length);
 	if (ret) {
-		btrfs_add_to_free_space_tree(trans, new_addr, length);
+		btrfs_abort_transaction(trans, ret);
 		goto fail;
 	}
 
-- 
2.52.0