block: add an API for Persistent Reservations

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This commits adds a driver API and ioctls for controlling Persistent
Reservations s/genericly/generically/ at the block layer.  Persistent
Reservations are supported by SCSI and NVMe and allow controlling who gets
access to a device in a shared storage setup.

Note that we add a pr_ops structure to struct block_device_operations
instead of adding the members directly to avoid bloating all instances
of devices that will never support Persistent Reservations.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>

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This commit is contained in:

Christoph Hellwig 2015-10-15 14:10:48 +02:00 • committed by Jens Axboe

parent d8e4bb8103

commit bbd3e06436

5 changed files with 290 additions and 0 deletions

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2

include/linux/blkdev.h

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18

include/linux/pr.h

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48

include/uapi/linux/pr.h

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