[PATCH 00/14] Make ib_srp better suited for H.A. purposes

[Bart Van Assche <bvanassche@xxxxxxx>]

This patch series makes the ib_srp driver better suited for use in a H.A.
setup because:
- Switchover without triggering read or write errors become possible. Such
  errors are bad because these can make a filesystem switch to read-only
  mode.
- A ping mechanism has been added that allows to reduce the switch-over
  time greatly.
- Disconnecting from a target without unloading ib_srp becomes possible.
- Switchover can be triggered explicitly by deleting an initiator device.

Where possible these mechanisms have been modelled after similar
functionality in the open-iscsi kernel code.

According to the measurements I ran these patches do not affect ib_srp
performance.

The individual patches are:
0001-ib_srp-Introduce-pr_fmt.patch
0002-ib_srp-Consolidate-repetitive-sysfs-code.patch
0003-ib_srp-Disallow-duplicate-logins.patch
0004-ib_srp-Set-block-layer-timeout.patch
0005-ib_srp-Avoid-that-late-SRP-replies-cause-trouble.patch
0006-ib_srp-Micro-optimize-completion-handlers.patch
0007-ib_srp-Introduce-srp_handle_qp_err.patch
0008-srp_transport-Document-sysfs-attributes.patch
0009-srp_transport-Fix-atttribute-registration-race.patch
0010-srp_transport-Simplify-attribute-initialization-code.patch
0011-ib_srp-Document-sysfs-attributes.patch
0012-ib_srp-Rework-error-handling.patch
0013-ib_srp-Implement-transport-layer-ping.patch
0014-ib_srp-Allow-SRP-disconnect-through-sysfs.patch
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