[PATCH 00/19, v5] Make ib_srp better suited for H.A. purposes

[Bart Van Assche <bvanassche-HInyCGIudOg@public.gmane.org>]

This patch series makes the ib_srp driver better suited for use in a
H.A. setup because:
- multipathd is notified faster about transport layer failures.
- Transport layer failures reliably result in SCSI host removal.
- Switchover can be triggered explicitly by deleting an initiator
   device.
- Disconnecting from a target without unloading ib_srp is now possible.

This patch series is also available here:
http://github.com/bvanassche/linux/commits/srp-ha
And a backport of this patch series to kernels 3.6 and before is 
available here: http://github.com/bvanassche/ib_srp-backport.

Changes since v4:
- Added a patch for removing SCSI devices upon a port down event

Changes since v3:
- Restored the dev_loss_tmo and fast_io_fail_tmo sysfs attributes.
- Included a patch to fix an ib_srp crash that could be triggered by
   cable pulling.

Changes since v2:
- Addressed the v2 review comments.
- Dropped the patches that have already been merged.
- Dropped the patches for integration with multipathd.
- Dropped the micro-optimization of the IB completion handlers.

The individual patches are:
0001-ib_srp-Enlarge-block-layer-timeout.patch
0002-ib_srp-Eliminate-state-SRP_TARGET_CONNECTING.patch
0003-ib_srp-Introduce-srp_handle_qp_err.patch
0004-ib_srp-Suppress-superfluous-error-messages.patch
0005-ib_srp-Avoid-that-SCSI-error-handling-causes-trouble.patch
0006-ib_srp-Introduce-the-helper-function-srp_remove_targ.patch
0007-ib_srp-Eliminate-state-SRP_TARGET_DEAD.patch
0008-ib_srp-Keep-processing-commands-during-host-removal.patch
0009-ib_srp-Make-srp_disconnect_target-wait-for-IB-comple.patch
0010-ib_srp-Document-sysfs-attributes.patch
0011-srp_transport-Fix-atttribute-registration.patch
0012-srp_transport-Simplify-attribute-initialization-code.patch
0013-srp_transport-Document-sysfs-attributes.patch
0014-ib_srp-Allow-SRP-disconnect-through-sysfs.patch
0015-ib_srp-Maintain-a-single-connection-per-I_T-nexus.patch
0016-srp_transport-Add-transport-layer-error-handling.patch
0017-ib_srp-Add-dev_loss_tmo-support.patch
0018-ib_srp-Remove-SCSI-devices-upon-port-down-event.patch
0019-scsi_transport_srp-Fail-I-O-faster.patch

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