ctl: Add helper routines for setting NVMe completion status

Also includes a few protocol-agnostic wrappers for setting a generic
status (such as success) for a CTL I/O request whether it be SCSI or

ctl: Add helper routines for setting NVMe completion status

Also includes a few protocol-agnostic wrappers for setting a generic
status (such as success) for a CTL I/O request whether it be SCSI or
NVMe.

Reviewed by: imp
Sponsored by: Chelsio Communications
Differential Revision: https://reviews.freebsd.org/D44718

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sys: Remove $FreeBSD$: one-line .h pattern

Remove /^\s*\*+\s*\$FreeBSD\$.*$\n/

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

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sys/cam: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error

sys/cam: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

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Merge ^/head r312207 through r312308.

MFhead@r312305

Make CTL frontends report kern_data_resid for under-/overruns.

It seems like kern_data_resid was never really implemented. This change
finally does it. Now frontends update this field while transf

Make CTL frontends report kern_data_resid for under-/overruns.

It seems like kern_data_resid was never really implemented. This change
finally does it. Now frontends update this field while transferring data,
while CTL/backends getting it can more flexibly handle the result.
At this point behavior should not change significantly, still reporting
errors on write overrun, but that may be changed later, if we decide so.

CAM target frontend still does not properly handle overruns due to CAM API
limitations. We may need to add some fields to struct ccb_accept_tio to
pass information about initiator requested transfer size(s).

MFC after: 2 weeks

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Improve length handling when writing sense data.

- Allow maximal sense size limitation via Control Extension mode page.
- When sense size limited, include descriptors atomically: whole or none.
-

Improve length handling when writing sense data.

- Allow maximal sense size limitation via Control Extension mode page.
- When sense size limited, include descriptors atomically: whole or none.
- Set new SDAT_OVFL bit if some descriptors don't fit the limit.
- Report real written sense length instead of static maximal 252 bytes.

MFC after: 2 weeks

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When reporting "Logical block address out of range" error, report the LBA
in sense data INFORMATION field.

MFC after: 2 weeks

Merge from head

Sponsored by: Gandi.net

Merge from head

Sync up with head up to r289211.

Merge ^/head r288197 through r288456.

Merge from head

Umplement media load/eject support for removable devices.

In case of block backend eject really closes the backing store, while
load tries to open it back. Failed store open is reported as no media.

Sync up with head (up to r288341).

Merge ^/head r287878 through r288034.

Report proper medium error code for VERIFY commands.

Merge ^/head r287680 through r287877.

Implement QUERY TASK, QUERY TASK SET and QUERY ASYNC EVENT.

Now we support most of SAM-5 task management.

Improve read-only support.

Finish merging from head, messed up in previous attempt

Merge ^/head r287527 through r287679.

Reimplement CTL High Availability.

CTL HA functionality was originally implemented by Copan many years ago,
but large part of the sources was never published. This change includes
clean room implem

Reimplement CTL High Availability.

CTL HA functionality was originally implemented by Copan many years ago,
but large part of the sources was never published. This change includes
clean room implementation of the missing code and fixes for many bugs.

This code supports dual-node HA with ALUA in four modes:
- Active/Unavailable without interlink between nodes;
- Active/Standby with second node handling only basic LUN discovery and
reservation, synchronizing with the first node through the interlink;
- Active/Active with both nodes processing commands and accessing the
backing storage, synchronizing with the first node through the interlink;
- Active/Active with second node working as proxy, transfering all
commands to the first node for execution through the interlink.

Unlike original Copan's implementation, depending on specific hardware,
this code uses simple custom TCP-based protocol for interlink. It has
no authentication, so it should never be enabled on public interfaces.

The code may still need some polishing, but generally it is functional.

Relnotes: yes
Sponsored by: iXsystems, Inc.

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Merge sync of head