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authorChristoph Hellwig <hch@lst.de>2015-10-15 14:10:48 +0200
committerJens Axboe <axboe@fb.com>2015-10-21 14:46:56 -0600
commitbbd3e064362e5057cc4799ba2e4d68c7593e490b (patch)
tree94c1efd47cf05eaf940e3381bb4eb9df421ae001 /include/linux/pr.h
parentd8e4bb8103df02a2c509868732dc93fb66110a12 (diff)
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>
Diffstat (limited to 'include/linux/pr.h')
-rw-r--r--include/linux/pr.h18
1 files changed, 18 insertions, 0 deletions
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 */