Fork of alistair23 Linux kernel for reMarkable from https://github.com/alistair23/linux
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The ability to modify the SCSI device state was introduced by commit 638127e579a4 ("[PATCH] Fix error handler offline behaviour"; v2.6.12). That same commit introduced the following device states: { SDEV_CREATED, "created" }, { SDEV_RUNNING, "running" }, { SDEV_CANCEL, "cancel" }, { SDEV_DEL, "deleted" }, { SDEV_QUIESCE, "quiesce" }, { SDEV_OFFLINE, "offline" }, The SDEV_BLOCK state was introduced later to avoid that an FC cable pull would immediately result in an I/O error (commit 1094e682310e; "[PATCH] suspending I/Os to a device"; v2.6.12). That same patch introduced the ability to set the SDEV_BLOCK state from user space. I'm not sure whether that ability was introduced on purpose or accidentally. Since there is agreement that only writing "running" or "offline" into the SCSI sysfs device state attribute makes sense, restrict sysfs writes to these values. This patch makes sure that SDEV_BLOCK is only used for its original purpose, namely to allow transport drivers and LLDs to block further .queuecommand() calls while transport layer or adapter recovery is in progress. Note: a web search for "/sys/class/scsi_device" AND "device/state" revealed several storage configuration guides. The instructions I found in these guides tell users to write the value "running" or "offline" in the SCSI device state sysfs attribute and no other values. [mkp: typo] Cc: Christoph Hellwig <hch@lst.de> Cc: Ming Lei <ming.lei@redhat.com> Cc: Hannes Reinecke <hare@suse.de> Cc: Johannes Thumshirn <jthumshirn@suse.de> Cc: James Smart <james.smart@broadcom.com> Cc: Ewan D. Milne <emilne@redhat.com> Cc: Laurence Oberman <loberman@redhat.com> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> |
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Documentation | ||
LICENSES | ||
arch | ||
block | ||
certs | ||
crypto | ||
drivers | ||
fs | ||
include | ||
init | ||
ipc | ||
kernel | ||
lib | ||
mm | ||
net | ||
samples | ||
scripts | ||
security | ||
sound | ||
tools | ||
usr | ||
virt | ||
.clang-format | ||
.cocciconfig | ||
.get_maintainer.ignore | ||
.gitattributes | ||
.gitignore | ||
.mailmap | ||
COPYING | ||
CREDITS | ||
Kbuild | ||
Kconfig | ||
MAINTAINERS | ||
Makefile | ||
README |
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.