block: add an API for Persistent Reservations

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>

2 files changed, 20 insertions, 0 deletions

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 19c2e947d4d1..fe25da05e823 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 */
@@ -1633,6 +1634,7 @@ 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 */