[PATCH v3 0/4] nvme: improve error handling and ana_state to work well with dm-multipath

[Mike Snitzer]

Hi,

This patchset reflects changes needed to make NVMe error handling and
ANA state updates work well with dm-multipath (which always sets
REQ_FAILFAST_TRANSPORT).

RHEL8 has been carrying an older ~5.9 based version of this patchset
(since RHEL8.3, August 2020).

RHEL9 is coming, would really prefer that these changes land upstream
rather than carry them within RHEL.

All review/feedback welcome.

Thanks,
Mike

v3 -> v4, less is more:
- folded REQ_FAILFAST_TRANSPORT local retry and FAILUP patches
- simplified nvme_failup_req(), removes needless blk_path_error() et al
- removed comment block in nvme_decide_disposition()

v2 -> v3:
- Added Reviewed-by tags to BLK_STS_DO_NOT_RETRY patch.
- Eliminated __nvme_end_req() and added code comment to
  nvme_failup_req() in FAILUP handling patch.

Mike Snitzer (3):
  nvme: return BLK_STS_DO_NOT_RETRY if the DNR bit is set
  nvme: allow local retry and proper failover for REQ_FAILFAST_TRANSPORT
  nvme: decouple basic ANA log page re-read support from native
    multipathing

 drivers/nvme/host/core.c      | 22 +++++++++++++++++++---
 drivers/nvme/host/multipath.c | 16 +++++++++++-----
 drivers/nvme/host/nvme.h      |  4 ++++
 include/linux/blk_types.h     |  8 ++++++++
 4 files changed, 42 insertions(+), 8 deletions(-)

-- 
2.15.0