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Previously, when scst_pr_send_ua_reg attempted to deliver a UNIT ATTENTION to a registrant that was on another node in a dlm-based HA cluster, the unit attention was dropped. Rectify by adding a pr_reg_queue_rem_ua function to struct scst_cl_ops and calling it from scst_pr_send_ua_reg. Each registrant will maintain an incoming 'queue' of unit attentions by adding next_rem_ua_idx to the registrant data maintained in the DLM. This will tell the other nodes which PR_REG_UA_LOCK lock to create in the lockspace in order to 'send' a unit attention to the registrant. Further, each node will also maintain two lists (pending and sent) for the outgoing unit attentions from this node to a registrant. When the recipient has read all the sent unit attentions (and cleared next_rem_ua_idx), then the sent list may be cleared.
Overview
This is the source code repository of the SCST project. SCST is a collection of Linux kernel drivers that implement SCSI target functionality. The SCST project includes:
- The SCST core in the scst/ subdirectory.
- A tool for loading, saving and modifying the SCST configuration in directory scstadmin/.
- Several SCSI target drivers in the directories iscsi-scst/, qla2x00t/, srpt/, scst_local/ and fcst/.
- User space programs in the usr/ subdirectory, e.g. fileio_tgt.
- Various documentation in the doc/ subdirectory.
Instructions for building and installing SCST are available in the INSTALL.md file.
QLogic target driver
Two QLogic target drivers are included in the SCST project.
The default driver is located in qla2x00t-32gbit directory and it supports up to 32 Gb/s FC. It is the newer one.
May anyone wish to switch back to the older driver that only supported up to
16 Gb/s adapters, it is located in qla2x00t directory. To make use of the
older driver build scst with environment variable QLA_32GBIT=no set.
Vladislav Bolkhovitin vst@vlnb.net, http://scst.sourceforge.net
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