1. 22 May, 2023 1 commit
    • Martin K. Petersen's avatar
      Merge patch series "Use block pr_ops in LIO" · 7907ad74
      Martin K. Petersen authored
      Mike Christie <michael.christie@oracle.com> says:
      
      The patches in this thread allow us to use the block pr_ops with LIO's
      target_core_iblock module to support cluster applications in VMs. They
      were built over Linus's tree. They also apply over linux-next and
      Martin's tree and Jens's trees.
      
      Currently, to use windows clustering or linux clustering (pacemaker +
      cluster labs scsi fence agents) in VMs with LIO and vhost-scsi, you
      have to use tcmu or pscsi or use a cluster aware FS/framework for the
      LIO pr file. Setting up a cluster FS/framework is pain and waste when
      your real backend device is already a distributed device, and pscsi
      and tcmu are nice for specific use cases, but iblock gives you the
      best performance and allows you to use stacked devices like
      dm-multipath. So these patches allow iblock to work like pscsi/tcmu
      where they can pass a PR command to the backend module. And then
      iblock will use the pr_ops to pass the PR command to the real devices
      similar to what we do for unmap today.
      
      The patches are separated in the following groups:
      
      Patch 1 - 2:
      
       - Add block layer callouts for reading reservations and rename reservation
         error code.
      
      Patch 3 - 5:
      
       - SCSI support for new callouts.
      
      Patch 6:
      
       - DM support for new callouts.
      
      Patch 7 - 13:
      
       - NVMe support for new callouts.
      
      Patch 14 - 18:
      
       - LIO support for new callouts.
      
      This patchset has been tested with the libiscsi PGR ops and with
      window's failover cluster verification test. Note that for scsi
      backend devices we need this patchset:
      
      https://lore.kernel.org/linux-scsi/20230123221046.125483-1-michael.christie@oracle.com/T/#m4834a643ffb5bac2529d65d40906d3cfbdd9b1b7
      
      to handle UAs. To reduce the size of this patchset that's being done
      separately to make reviewing easier. And to make merging easier this
      patchset and the one above do not have any conflicts so can be merged
      in different trees.
      
      Link: https://lore.kernel.org/r/20230407200551.12660-1-michael.christie@oracle.comSigned-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      7907ad74
  2. 17 May, 2023 14 commits
  3. 08 May, 2023 25 commits