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The lockless fast path for scst_cmd_set_sn() can cause commands to lockup in state EXEC_CHECK_SN when there are multiple scst_tgts accessing the same scst_device, for example two initiators connected to the two ports of a dual-port QLogic FC HBA in target mode both reading from the same shared disk. The multithreaded_init_done value is too low-level for this; it does not take the higher-level configuration into account. - Remove the lockless fast path. - Remove multithreaded_init_done, which enabled/disabled the lockless fast path. - Push the locking down into scst_cmd_set_sn(), which will now apply regardless of set_sn_on_restart_cmd, which matters for mixed-driver (e.g. iSCSI+qla2xxx) target-mode setups. - Remove a bunch of comments explaining the rules for the lockless fast path. Fixes: https://github.com/SCST-project/scst/issues/333 Signed-off-by: Tony Battersby <tonyb@cybernetics.com>
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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