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'security' attribute displays the security state of an nvdimm. During normal operation, the nvdimm state maybe one of 'disabled', 'unlocked' or 'locked'. When an admin issues # ndctl sanitize-dimm nmem0 --overwrite the attribute is expected to change to 'overwrite' until the overwrite operation completes. But tests on our systems show that 'overwrite' is never shown during the overwrite operation. i.e. # cat /sys/devices/LNXSYSTM:00/LNXSYBUS:00/ACPI0012:00/ndbus0/nmem0/security unlocked the attribute remain 'unlocked' through out the operation, consequently "ndctl wait-overwrite nmem0" command doesn't wait at all. The driver tracks the state in 'nvdimm->sec.flags': when the operation starts, it adds an overwrite bit to the flags; and when the operation completes, it removes the bit. Hence security_show() should check the 'overwrite' bit first, in order to indicate the actual state when multiple bits are set in the flags. Link: https://lore.kernel.org/r/1596494499-9852-2-git-send-email-jane.chu@oracle.com Reviewed-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Jane Chu <jane.chu@oracle.com> Signed-off-by: Vishal Verma <vishal.l.verma@intel.com> |
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| kernel | ||
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| .clang-format | ||
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| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.