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80c49563e2
The Start Stop Unit (SSU) command takes in the order of a second to complete
on some SAS SSDs and longer on hard disks. Synchronize Cache (SC) can also
take some time. Both commands have an IMMED bit in their cdbs for those apps
that don't want to wait. This patch introduces a long delay for those commands
when the IMMED bit is clear. Since SC is a media access command then when the
fake_rw option is active, its cdb processing is skipped and it returns
immediately. The SSU command is not altered by the setting of the fake_rw
option. These actions are not changed by this patch.
Changes since v1:
- clear the cdb mask of SYNCHRONIZE CACHE(16) cdb in byte 1, bit 0
Changes:
- add the SYNCHRONIZE CACHE(16) command
- together with the existing START STOP UNIT and SYNCHRONIZE CACHE(10)
commands process the IMMED bit in their cdbs
- if the IMMED bit is set, return immediately
- if the IMMED bit is clear, treat the delay parameter as having
a unit of one second
- in the SYNCHRONIZE CACHE processing do a bounds check
Signed-off-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.