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authorLinus Torvalds <torvalds@linux-foundation.org>2015-11-05 08:01:27 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-11-05 08:01:27 +0300
commitccf21b69a83afaee4d5499e0d03eacf23946e08c (patch)
tree9831589f82e8d5a47eac253f54f4121e62e4c5a6 /include
parent527d1529e38b36fd22e65711b653ab773179d9e8 (diff)
parent73fcf4e20ebd19468b3ad033be93582258435462 (diff)
downloadlinux-ccf21b69a83afaee4d5499e0d03eacf23946e08c.tar.xz
Merge branch 'for-4.4/reservations' of git://git.kernel.dk/linux-block
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
Diffstat (limited to 'include')
-rw-r--r--include/linux/blkdev.h2
-rw-r--r--include/linux/pr.h18
-rw-r--r--include/uapi/linux/pr.h48
3 files changed, 68 insertions, 0 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index cf57884db4b7..d045ca8487af 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -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,
diff --git a/include/linux/pr.h b/include/linux/pr.h
new file mode 100644
index 000000000000..65c01c10b335
--- /dev/null
+++ b/include/linux/pr.h
@@ -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 */
diff --git a/include/uapi/linux/pr.h b/include/uapi/linux/pr.h
new file mode 100644
index 000000000000..57d7c0f916b6
--- /dev/null
+++ b/include/uapi/linux/pr.h
@@ -0,0 +1,48 @@
+#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 */