[PATCH v2 00/13] libmultipath: a generic multipath lib for block drivers

[John Garry]

On 15/05/2026 01:24, Mike Snitzer wrote:
> On Tue, Apr 28, 2026 at 11:10:52AM +0000, John Garry wrote:
>> libmultipath: a generic multipath lib for block drivers
>>
>> 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.
>>
>> - 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.
> To get upstream this library needs an in-tree consumer. So at the end
> of the series, it'd makes sense to include the NVMe and/or SCSI
> changes that uses it.

I just sent the SCSI and NVMe series separately. Many devs would find it 
off putting to review a series with so patches.