On 28/04/2026 14:10, John Garry wrote:
libmultipath: a generic multipath lib for block drivers
This is very nice John.
This series introduces libmultipath. It is essentially a refactoring of NVME multipath support, so we can have a common library to also support native SCSI multipath. Much of the code is taken directly from the NVMe multipath code. However, NVMe specifics are removed. A template structure is provided so the driver may provide callbacks for driver specifics, like ANA support for NVMe. Important new structures introduced include: - mpath_head These contain much of the multipath-specific functionality from nvme_ns_head, including a pointer to the gendisk structure and a path SRCU-based array.
I think it should be placed first in its parent struct as it holds the hot-path
head->srcu and head->list.
- mpath_device This is the per-path structure, and contains much the same multipath-specific functionality in nvme_ns libmultipath provides functionality for path management, path selection, data path, and failover handling. Since the NVMe driver has some code in the sysfs and ioctl handling which iterate all multipath NSes, functions like mpath_call_for_device() are added to do the same per-path iteration.
very nice, overall seems fairly straight forward.
