btrfs: skip transaction commit after failure to create subvolume
At ioctl.c:create_subvol(), when we fail to create a subvolume we always commit the transaction. In most cases this is a no-op, since all the error paths, except for one, abort the transaction - the only exception is when we fail to insert the new root item into the root tree, in that case we don't abort the transaction because we didn't do anything that is irreversible - however we end up committing the transaction which although is not a functional problem, it adds unnecessary rotation of the backup roots in the superblock and unnecessary work. So change that to commit a transaction only when no error happened, otherwise just call btrfs_end_transaction() to release our reference on the transaction. Reviewed-by: NNikolay Borisov <nborisov@suse.com> Signed-off-by: NFilipe Manana <fdmanana@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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