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authorLinus Torvalds <torvalds@linux-foundation.org>2015-11-04 21:01:27 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-11-04 21:01:27 -0800
commitccf21b69a83afaee4d5499e0d03eacf23946e08c (patch)
tree9831589f82e8d5a47eac253f54f4121e62e4c5a6 /include/uapi
parent527d1529e38b36fd22e65711b653ab773179d9e8 (diff)
parent73fcf4e20ebd19468b3ad033be93582258435462 (diff)
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/uapi')
-rw-r--r--include/uapi/linux/pr.h48
1 files changed, 48 insertions, 0 deletions
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 */