rbd: support for object-map and fast-diff
Speed up reads, discards and zeroouts through RBD_OBJ_FLAG_MAY_EXIST
and RBD_OBJ_FLAG_NOOP_FOR_NONEXISTENT based on object map.
Invalid object maps are not trusted, but still updated. Note that we
never iterate, resize or invalidate object maps. If object-map feature
is enabled but object map fails to load, we just fail the requester
(either "rbd map" or I/O, by way of post-acquire action).
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
diff --git a/net/ceph/cls_lock_client.c b/net/ceph/cls_lock_client.c
index fb59094..17447c1 100644
--- a/net/ceph/cls_lock_client.c
+++ b/net/ceph/cls_lock_client.c
@@ -6,6 +6,7 @@
#include <linux/ceph/cls_lock_client.h>
#include <linux/ceph/decode.h>
+#include <linux/ceph/libceph.h>
/**
* ceph_cls_lock - grab rados lock for object
@@ -378,3 +379,47 @@ int ceph_cls_lock_info(struct ceph_osd_client *osdc,
return ret;
}
EXPORT_SYMBOL(ceph_cls_lock_info);
+
+int ceph_cls_assert_locked(struct ceph_osd_request *req, int which,
+ char *lock_name, u8 type, char *cookie, char *tag)
+{
+ int assert_op_buf_size;
+ int name_len = strlen(lock_name);
+ int cookie_len = strlen(cookie);
+ int tag_len = strlen(tag);
+ struct page **pages;
+ void *p, *end;
+ int ret;
+
+ assert_op_buf_size = name_len + sizeof(__le32) +
+ cookie_len + sizeof(__le32) +
+ tag_len + sizeof(__le32) +
+ sizeof(u8) + CEPH_ENCODING_START_BLK_LEN;
+ if (assert_op_buf_size > PAGE_SIZE)
+ return -E2BIG;
+
+ ret = osd_req_op_cls_init(req, which, "lock", "assert_locked");
+ if (ret)
+ return ret;
+
+ pages = ceph_alloc_page_vector(1, GFP_NOIO);
+ if (IS_ERR(pages))
+ return PTR_ERR(pages);
+
+ p = page_address(pages[0]);
+ end = p + assert_op_buf_size;
+
+ /* encode cls_lock_assert_op struct */
+ ceph_start_encoding(&p, 1, 1,
+ assert_op_buf_size - CEPH_ENCODING_START_BLK_LEN);
+ ceph_encode_string(&p, end, lock_name, name_len);
+ ceph_encode_8(&p, type);
+ ceph_encode_string(&p, end, cookie, cookie_len);
+ ceph_encode_string(&p, end, tag, tag_len);
+ WARN_ON(p != end);
+
+ osd_req_op_cls_request_data_pages(req, which, pages, assert_op_buf_size,
+ 0, false, true);
+ return 0;
+}
+EXPORT_SYMBOL(ceph_cls_assert_locked);