libceph: support for advisory locking on RADOS objects

This patch adds support for rados lock, unlock and break lock.

Based heavily on code by Mike Christie <michaelc@cs.wisc.edu>.

Signed-off-by: Douglas Fuller <dfuller@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Mike Christie <mchristi@redhat.com>
Reviewed-by: Alex Elder <elder@linaro.org>

1 files changed, 27 insertions, 0 deletions

diff --git a/include/linux/ceph/cls_lock_client.h b/include/linux/ceph/cls_lock_client.h
new file mode 100644
index 000000000000..4e4dffef22bb
--- /dev/null
+++ b/include/linux/ceph/cls_lock_client.h
@@ -0,0 +1,27 @@
+#ifndef _LINUX_CEPH_CLS_LOCK_CLIENT_H
+#define _LINUX_CEPH_CLS_LOCK_CLIENT_H
+
+#include <linux/ceph/osd_client.h>
+
+enum ceph_cls_lock_type {
+        CEPH_CLS_LOCK_NONE = 0,
+        CEPH_CLS_LOCK_EXCLUSIVE = 1,
+        CEPH_CLS_LOCK_SHARED = 2,
+};
+
+int ceph_cls_lock(struct ceph_osd_client *osdc,
+                  struct ceph_object_id *oid,
+                  struct ceph_object_locator *oloc,
+                  char *lock_name, u8 type, char *cookie,
+                  char *tag, char *desc, u8 flags);
+int ceph_cls_unlock(struct ceph_osd_client *osdc,
+                    struct ceph_object_id *oid,
+                    struct ceph_object_locator *oloc,
+                    char *lock_name, char *cookie);
+int ceph_cls_break_lock(struct ceph_osd_client *osdc,
+                        struct ceph_object_id *oid,
+                        struct ceph_object_locator *oloc,
+                        char *lock_name, char *cookie,
+                        struct ceph_entity_name *locker);
+
+#endif