On 10/23/2017 12:58 AM, Nikolay Borisov wrote:
> btrfs_rm_dev_item calls several function under an activa transaction, however
^^
active
> it fails to abort it if an error happens. Fix this by adding explicit
> btrfs_abort_transaction/btrfs_end_transaction calls
>
> Signed-off-by: Nikolay Borisov <nbori...@suse.com>
> ---
> V4:
> * Reorder the code a bit to prevent duplication of btrfs_free_path
> invocation.
>
> * Collapse the handling of btrfs_search_slot return value in a single if
> branch rather than having it spread across 2 branches
>
> V3:
> * The path needs to be freed before the the transaction is comitted
> otherwise
> we will deadlock.
> fs/btrfs/volumes.c | 20 ++++++++++++--------
> 1 file changed, 12 insertions(+), 8 deletions(-)
>
> diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
> index 0e8f16c305df..8b139d203f8c 100644
> --- a/fs/btrfs/volumes.c
> +++ b/fs/btrfs/volumes.c
> @@ -1765,20 +1765,24 @@ static int btrfs_rm_dev_item(struct btrfs_fs_info
> *fs_info,
> key.offset = device->devid;
>
> ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
> - if (ret < 0)
> - goto out;
> -
> - if (ret > 0) {
> - ret = -ENOENT;
> + if (ret) {
> + if (ret > 0)
> + ret = -ENOENT;
> + btrfs_abort_transaction(trans, ret);
> + btrfs_end_transaction(trans);
> goto out;
> }
>
> ret = btrfs_del_item(trans, root, path);
> - if (ret)
> - goto out;
> + if (ret) {
> + btrfs_abort_transaction(trans, ret);
> + btrfs_end_transaction(trans);
> + }
> +
> out:
> btrfs_free_path(path);
> - btrfs_commit_transaction(trans);
> + if (!ret)
> + ret = btrfs_commit_transaction(trans);
> return ret;
> }
>
>
Perhaps slightly simpler (and the 'out:' label maybe goes away):
.....
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
if (ret > 0)
ret = -ENOENT;
else if (!ret)
ret = btrfs_del_item(trans, root, path);
if (ret) {
btrfs_abort_transaction(trans, ret);
btrfs_end_transaction(trans);
}
out:
.....
Ed
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