[PATCH v3 0/2] dm: dm_blk_ioctl(): implement failover for SG_IO on dm-multipath

[mwilck@suse.com]

From: Martin Wilck <mwilck@suse.com>

Hello Mike,

here is v3 of my attempt to add retry logic to SG_IO on dm-multipath devices.
Sorry that it took such a long time.

Regards
Martin

Changes v2->v3:

 - un-inlined scsi_result_to_blk_status again, and move the helper
   __scsi_result_to_blk_status to block/scsi_ioctl.c instead
   (Bart v. Assche)
 - open-coded the status/msg/host/driver-byte -> result conversion
   where the standard SCSI helpers aren't usable (Bart v. Assche)
    
Changes v1->v2:

 - applied modifications from Mike Snitzer
 - moved SG_IO dependent code to a separate file, no scsi includes in
   dm.c any more
 - made the new code depend on a configuration option 
 - separated out scsi changes, made scsi_result_to_blk_status()
   inline to avoid dependency of dm_mod from scsi_mod (Paolo Bonzini)

Martin Wilck (2):
  scsi: export __scsi_result_to_blk_status() in scsi_ioctl.c
  dm: add CONFIG_DM_MULTIPATH_SG_IO - failover for SG_IO on dm-multipath

 block/scsi_ioctl.c         |  52 ++++++++++++++-
 drivers/md/Kconfig         |  11 ++++
 drivers/md/Makefile        |   4 ++
 drivers/md/dm-core.h       |   5 ++
 drivers/md/dm-rq.h         |  11 ++++
 drivers/md/dm-scsi_ioctl.c | 127 +++++++++++++++++++++++++++++++++++++
 drivers/md/dm.c            |  20 +++++-
 drivers/scsi/scsi_lib.c    |  29 +--------
 include/linux/blkdev.h     |   3 +
 9 files changed, 229 insertions(+), 33 deletions(-)
 create mode 100644 drivers/md/dm-scsi_ioctl.c

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2.31.1