Gleb Chesnokov
01bdcc047d
fileio_exec_write() passes its local loff to scst_writev(), which advances it by the number of bytes written. Using that offset for the subsequent FUA flush starts the range after the data instead of at its beginning. The command can therefore complete without synchronizing its writes. The 2011 opcode dispatch refactoring moved the flush into the write function, where loff was already advanced between I/O batches. The 2012 zero-copy change then passed &loff instead of &fd->f_pos to vfs_writev(), making the offset wrong even for a write completed in one call. Use the unchanged command offset for the flush, including after short writes and errors. Keep the working offset for advancing through the I/O. Fixes:63a6094cad("Eliminate the blockio / fileio / nullio if-statements in vdisk_do_job() and the READ/WRITE functions called from that function. Convert the opcode switch in vdisk_*do_job() to an array with function pointers.") Fixes:f742ae018e("scst_vdisk: Add zero-copy file I/O readsupport") Link: https://github.com/SCST-project/scst/issues/395
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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