[PATCH 33/35] btrfs: fix insert_reserved error handling

Josef Bacik
2018-08-30T21:46:43Z

We were not handling the reserved byte accounting properly for data
references. Metadata was fine, if it errored out the error paths would
free the bytes_reserved count and pin the extent, but it even missed one
of the error cases. So instead move this handling up into
run_one_delayed_ref so we are sure that both cases are properly cleaned
up in case of a transaction abort.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
---
fs/btrfs/extent-tree.c | 12 ++++--------
1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 132a1157982c..fd9169f80de0 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -2405,6 +2405,9 @@ static int run_one_delayed_ref(struct btrfs_trans_handle *trans,
insert_reserved);
else
BUG();
+ if (ret && insert_reserved)
+ btrfs_pin_extent(trans->fs_info, node->bytenr,
+ node->num_bytes, 1);
return ret;
}

@@ -8227,21 +8230,14 @@ static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans,
}

path = btrfs_alloc_path();
- if (!path) {
- btrfs_free_and_pin_reserved_extent(fs_info,
- extent_key.objectid,
- fs_info->nodesize);
+ if (!path)
return -ENOMEM;
- }

path->leave_spinning = 1;
ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path,
&extent_key, size);
if (ret) {
btrfs_free_path(path);
- btrfs_free_and_pin_reserved_extent(fs_info,
- extent_key.objectid,
- fs_info->nodesize);
return ret;
}

--
2.14.3