Gleb Chesnokov
7dc98f5b29
Task-management initialization reads sess->acg before acquiring activity protection. A concurrent reassignment can clear this pointer and later drop the old ACG reference, so the read can dereference NULL or freed storage even while ordinary command processing is suspended. Keep a session-owned copy of the black-hole mode and read it with READ_ONCE() in the TM path. Initialize it before admitting session work, retain the old mode while replacing LUNs, and publish the new mode when installing the new ACG. Update existing sessions on sysfs writes as well. All writers hold scst_mutex and use WRITE_ONCE(); the TM command already owns a session reference, so no additional locking or ACG reference is needed for this scalar policy read. Read the previous sysfs value under the same mutex so concurrent stores cannot mistake a real change for a no-op and leave session copies stale. Extend the private TM tests with sysfs mode transitions, rejected writes, and old/new drop-policy checks inside and after real reassignment. Remove the dedicated Ginkgo opt-in and Skip path now that the fix is in place, so both teardown scenarios run whenever their labels are selected, including full CI runs. Link: https://github.com/SCST-project/scst/issues/367
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-32gbit/, qla2x00t/, srpt/, scst_local/ and fcst/.
- User space programs in the usr/ subdirectory, e.g. fileio_tgt.
- Various documentation in the doc/ subdirectory.
Documentation
- Building and installing SCST.
- Build options: Clang, cross-compilation, and kernel module signing.
- Configuration and administration: targets, devices,
LUNs, and
/etc/scst.conf. - Core and device handlers: operating modes, module parameters, and sysfs configuration.
- Target drivers: iSCSI, iSER, QLogic Fibre Channel, SRP, FCoE, and local loopback.
- Performance tuning.
- Clustered persistent reservations: synchronization through DLM.
- T10 protection information: data integrity modes and configuration.
- Developer references: architecture and userspace handler interface (SGML sources), and sysfs interface rules.
- Contributing: code style, commit conventions, local checks, and guides to KUnit and component testing.
Current master packages
Prebuilt x86_64 packages from the latest successfully published master
build are available in the rolling
master-rpm prerelease.
These are development snapshots, not SCST releases.
The snapshot contains RPM bundles for selected Rocky Linux and Oracle Linux
UEK kernels. It also contains Ubuntu LTS bundles with scst-dkms, scstadmin
and iscsi-scst binary packages and their Debian source package files. Exact
distribution releases and RPM kernel versions are included in the asset names.
Every .tar.gz bundle has a matching .sha256 file. The complete snapshot is
replaced after each successful package workflow for the current master
commit.
QLogic target driver
Two QLogic target drivers are included in the SCST project.
The default driver is located in the qla2x00t-32gbit directory. 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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