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Merge branch 'for-4.4/reservations' of git://git.kernel.dk/linux-block

Browse source 
Pull block reservation support from Jens Axboe:
 "This adds support for persistent reservations, both at the core level,
  as well as for sd and NVMe"

[ Background from the docs: "Persistent Reservations allow restricting
  access to block devices to specific initiators in a shared storage
  setup.  All implementations are expected to ensure the reservations
  survive a power loss and cover all connections in a multi path
  environment" ]

* 'for-4.4/reservations' of git://git.kernel.dk/linux-block:
  NVMe: Precedence error in nvme_pr_clear()
  nvme: add missing endianess annotations in nvme_pr_command
  NVMe: Add persistent reservation ops
  sd: implement the Persistent Reservation API
  block: add an API for Persistent Reservations
  block: cleanup blkdev_ioctl
This commit is contained in:
Linus Torvalds 2015-11-04 21:01:27 -08:00
commit ccf21b69a8
7 changed files with 608 additions and 100 deletions
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2
include/linux/blkdev.h
View file

@ -35,6 +35,7 @@ struct sg_io_hdr;
struct bsg_job;
struct blkcg_gq;
struct blk_flush_queue;
struct pr_ops;
#define BLKDEV_MIN_RQ 4
#define BLKDEV_MAX_RQ 128 /* Default maximum */
@ -1629,6 +1630,7 @@ struct block_device_operations {
/* this callback is with swap_lock and sometimes page table lock held */
void (*swap_slot_free_notify) (struct block_device *, unsigned long);
struct module *owner;
const struct pr_ops *pr_ops;
};
extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int,

18
include/linux/pr.h Normal file
View file

@ -0,0 +1,18 @@
#ifndef LINUX_PR_H
#define LINUX_PR_H
#include <uapi/linux/pr.h>
struct pr_ops {
int (*pr_register)(struct block_device *bdev, u64 old_key, u64 new_key,
u32 flags);
int (*pr_reserve)(struct block_device *bdev, u64 key,
enum pr_type type, u32 flags);
int (*pr_release)(struct block_device *bdev, u64 key,
enum pr_type type);
int (*pr_preempt)(struct block_device *bdev, u64 old_key, u64 new_key,
enum pr_type type, bool abort);
int (*pr_clear)(struct block_device *bdev, u64 key);
};
#endif /* LINUX_PR_H */