[PATCH-v2 00/16] target: Allow backends to operate independent of se_cmd

["Nicholas A. Bellinger" <nab@linux-iscsi.org>]

From: Nicholas Bellinger <nab@linux-iscsi.org>

Hi Jens, HCH & Co,

This -v2 series introduces target_iostate + target_iomem descriptors
that abstract what existing target backend drivers require in order
to process I/O, sync_cache, write_same and unmap via sbc_ops.

The purpose is to allow existing target backend drivers from within
/sys/kernel/config/target/core/ to be accessed externally outside
of the existing /sys/kernel/config/target/$FABRIC/ configfs layout,
to operate independently of se_cmd + SCSI specific dependencies.

Namely, it's intended for the newly released nvme-target code to
utilize existing target-core backend drivers + T10-PI logic, without
requiring consumers to be under /sys/kernel/config/target/$FABRIC/
configfs layout.

Also included is a prerequisite bug-fix for target-core, and IBLOCK
optimization for eliminating the internal memory allocation.

v2 changes:

   - Convert sbc_ops->execute_unmap() capable backends to use
     __blkdev_issue_discard() asynchronous completion.
   - Convert IBLOCK to use inline bio + bvec, and use blk_poll()
     following nvmet/io-cmd for I/O submission.

Please review,

--nab

Nicholas Bellinger (16):
  target: Fix for hang of Ordered task in TCM
  target: Add target_iomem descriptor
  target: Add target_iostate descriptor
  target: Add target_complete_ios wrapper
  target: Setup target_iostate memory in __target_execute_cmd
  target: Convert se_cmd->execute_cmd to target_iostate
  target/sbc: Convert sbc_ops->execute_rw to target_iostate
  target/sbc: Convert sbc_dif_copy_prot to target_iostate
  target/file: Convert sbc_dif_verify to target_iostate
  target/iblock: Fold iblock_req into target_iostate
  target/sbc: Convert sbc_ops->execute_sync_cache to target_iostate
  target/sbc: Convert sbc_ops->execute_write_same to target_iostate
  target/sbc: Convert sbc_ops->execute_unmap to target_iostate
  target: Make sbc_ops accessable via target_backend_ops
  target/sbc: Convert ->execute_unmap to __blkdev_issue_discard
  target/iblock: Convert to inline bio/bvec + blk_poll

 drivers/infiniband/ulp/isert/ib_isert.c           |  61 ++--
 drivers/infiniband/ulp/srpt/ib_srpt.c             |   6 +-
 drivers/scsi/qla2xxx/qla_target.c                 |  64 ++---
 drivers/scsi/qla2xxx/tcm_qla2xxx.c                |  29 +-
 drivers/target/iscsi/cxgbit/cxgbit_ddp.c          |   8 +-
 drivers/target/iscsi/cxgbit/cxgbit_target.c       |  20 +-
 drivers/target/iscsi/iscsi_target.c               |  26 +-
 drivers/target/iscsi/iscsi_target_datain_values.c |  18 +-
 drivers/target/iscsi/iscsi_target_erl0.c          |  24 +-
 drivers/target/iscsi/iscsi_target_erl1.c          |   8 +-
 drivers/target/iscsi/iscsi_target_seq_pdu_list.c  |  40 +--
 drivers/target/iscsi/iscsi_target_tmr.c           |   4 +-
 drivers/target/iscsi/iscsi_target_util.c          |   4 +-
 drivers/target/loopback/tcm_loop.c                |   2 +-
 drivers/target/sbp/sbp_target.c                   |   8 +-
 drivers/target/target_core_alua.c                 |  43 +--
 drivers/target/target_core_alua.h                 |   6 +-
 drivers/target/target_core_device.c               |  24 +-
 drivers/target/target_core_file.c                 | 148 +++++-----
 drivers/target/target_core_iblock.c               | 266 ++++++++----------
 drivers/target/target_core_iblock.h               |   5 -
 drivers/target/target_core_internal.h             |   1 +
 drivers/target/target_core_pr.c                   |  68 ++---
 drivers/target/target_core_pr.h                   |   8 +-
 drivers/target/target_core_pscsi.c                |  26 +-
 drivers/target/target_core_rd.c                   |  44 +--
 drivers/target/target_core_sbc.c                  | 321 +++++++++++++---------
 drivers/target/target_core_spc.c                  |  47 ++--
 drivers/target/target_core_transport.c            | 272 ++++++++++--------
 drivers/target/target_core_user.c                 |  41 +--
 drivers/target/target_core_xcopy.c                |  33 ++-
 drivers/target/target_core_xcopy.h                |   4 +-
 drivers/target/tcm_fc/tfc_cmd.c                   |  14 +-
 drivers/target/tcm_fc/tfc_io.c                    |  21 +-
 drivers/usb/gadget/function/f_tcm.c               |  50 ++--
 drivers/vhost/scsi.c                              |   2 +-
 include/target/target_core_backend.h              |  30 +-
 include/target/target_core_base.h                 |  76 +++--
 include/target/target_core_fabric.h               |   3 +-
 include/trace/events/target.h                     |   4 +-
 40 files changed, 1012 insertions(+), 867 deletions(-)

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1.9.1