mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 17:08:10 +00:00
bbd3e06436
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>
48 lines
999 B
C
48 lines
999 B
C
#ifndef _UAPI_PR_H
|
|
#define _UAPI_PR_H
|
|
|
|
enum pr_type {
|
|
PR_WRITE_EXCLUSIVE = 1,
|
|
PR_EXCLUSIVE_ACCESS = 2,
|
|
PR_WRITE_EXCLUSIVE_REG_ONLY = 3,
|
|
PR_EXCLUSIVE_ACCESS_REG_ONLY = 4,
|
|
PR_WRITE_EXCLUSIVE_ALL_REGS = 5,
|
|
PR_EXCLUSIVE_ACCESS_ALL_REGS = 6,
|
|
};
|
|
|
|
struct pr_reservation {
|
|
__u64 key;
|
|
__u32 type;
|
|
__u32 flags;
|
|
};
|
|
|
|
struct pr_registration {
|
|
__u64 old_key;
|
|
__u64 new_key;
|
|
__u32 flags;
|
|
__u32 __pad;
|
|
};
|
|
|
|
struct pr_preempt {
|
|
__u64 old_key;
|
|
__u64 new_key;
|
|
__u32 type;
|
|
__u32 flags;
|
|
};
|
|
|
|
struct pr_clear {
|
|
__u64 key;
|
|
__u32 flags;
|
|
__u32 __pad;
|
|
};
|
|
|
|
#define PR_FL_IGNORE_KEY (1 << 0) /* ignore existing key */
|
|
|
|
#define IOC_PR_REGISTER _IOW('p', 200, struct pr_registration)
|
|
#define IOC_PR_RESERVE _IOW('p', 201, struct pr_reservation)
|
|
#define IOC_PR_RELEASE _IOW('p', 202, struct pr_reservation)
|
|
#define IOC_PR_PREEMPT _IOW('p', 203, struct pr_preempt)
|
|
#define IOC_PR_PREEMPT_ABORT _IOW('p', 204, struct pr_preempt)
|
|
#define IOC_PR_CLEAR _IOW('p', 205, struct pr_clear)
|
|
|
|
#endif /* _UAPI_PR_H */
|