libceph: support for CEPH_OSD_OP_LIST_WATCHERS
Add support for this Ceph OSD op, needed to support the RBD exclusive
lock feature.
Signed-off-by: Douglas Fuller <dfuller@redhat.com>
[idryomov@gmail.com: refactor, misc fixes throughout]
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Mike Christie <mchristi@redhat.com>
Reviewed-by: Alex Elder <elder@linaro.org>
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index a97e7b5..dd51ec8 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -338,6 +338,9 @@
ceph_osd_data_release(&op->notify.request_data);
ceph_osd_data_release(&op->notify.response_data);
break;
+ case CEPH_OSD_OP_LIST_WATCHERS:
+ ceph_osd_data_release(&op->list_watchers.response_data);
+ break;
default:
break;
}
@@ -863,6 +866,8 @@
case CEPH_OSD_OP_NOTIFY:
dst->notify.cookie = cpu_to_le64(src->notify.cookie);
break;
+ case CEPH_OSD_OP_LIST_WATCHERS:
+ break;
case CEPH_OSD_OP_SETALLOCHINT:
dst->alloc_hint.expected_object_size =
cpu_to_le64(src->alloc_hint.expected_object_size);
@@ -1445,6 +1450,10 @@
ceph_osdc_msg_data_add(req->r_reply,
&op->extent.osd_data);
break;
+ case CEPH_OSD_OP_LIST_WATCHERS:
+ ceph_osdc_msg_data_add(req->r_reply,
+ &op->list_watchers.response_data);
+ break;
/* both */
case CEPH_OSD_OP_CALL:
@@ -3891,6 +3900,114 @@
return ret;
}
+static int decode_watcher(void **p, void *end, struct ceph_watch_item *item)
+{
+ u8 struct_v;
+ u32 struct_len;
+ int ret;
+
+ ret = ceph_start_decoding(p, end, 2, "watch_item_t",
+ &struct_v, &struct_len);
+ if (ret)
+ return ret;
+
+ ceph_decode_copy(p, &item->name, sizeof(item->name));
+ item->cookie = ceph_decode_64(p);
+ *p += 4; /* skip timeout_seconds */
+ if (struct_v >= 2) {
+ ceph_decode_copy(p, &item->addr, sizeof(item->addr));
+ ceph_decode_addr(&item->addr);
+ }
+
+ dout("%s %s%llu cookie %llu addr %s\n", __func__,
+ ENTITY_NAME(item->name), item->cookie,
+ ceph_pr_addr(&item->addr.in_addr));
+ return 0;
+}
+
+static int decode_watchers(void **p, void *end,
+ struct ceph_watch_item **watchers,
+ u32 *num_watchers)
+{
+ u8 struct_v;
+ u32 struct_len;
+ int i;
+ int ret;
+
+ ret = ceph_start_decoding(p, end, 1, "obj_list_watch_response_t",
+ &struct_v, &struct_len);
+ if (ret)
+ return ret;
+
+ *num_watchers = ceph_decode_32(p);
+ *watchers = kcalloc(*num_watchers, sizeof(**watchers), GFP_NOIO);
+ if (!*watchers)
+ return -ENOMEM;
+
+ for (i = 0; i < *num_watchers; i++) {
+ ret = decode_watcher(p, end, *watchers + i);
+ if (ret) {
+ kfree(*watchers);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * On success, the caller is responsible for:
+ *
+ * kfree(watchers);
+ */
+int ceph_osdc_list_watchers(struct ceph_osd_client *osdc,
+ struct ceph_object_id *oid,
+ struct ceph_object_locator *oloc,
+ struct ceph_watch_item **watchers,
+ u32 *num_watchers)
+{
+ struct ceph_osd_request *req;
+ struct page **pages;
+ int ret;
+
+ req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_NOIO);
+ if (!req)
+ return -ENOMEM;
+
+ ceph_oid_copy(&req->r_base_oid, oid);
+ ceph_oloc_copy(&req->r_base_oloc, oloc);
+ req->r_flags = CEPH_OSD_FLAG_READ;
+
+ ret = ceph_osdc_alloc_messages(req, GFP_NOIO);
+ if (ret)
+ goto out_put_req;
+
+ pages = ceph_alloc_page_vector(1, GFP_NOIO);
+ if (IS_ERR(pages)) {
+ ret = PTR_ERR(pages);
+ goto out_put_req;
+ }
+
+ osd_req_op_init(req, 0, CEPH_OSD_OP_LIST_WATCHERS, 0);
+ ceph_osd_data_pages_init(osd_req_op_data(req, 0, list_watchers,
+ response_data),
+ pages, PAGE_SIZE, 0, false, true);
+
+ ceph_osdc_start_request(osdc, req, false);
+ ret = ceph_osdc_wait_request(osdc, req);
+ if (ret >= 0) {
+ void *p = page_address(pages[0]);
+ void *const end = p + req->r_ops[0].outdata_len;
+
+ ret = decode_watchers(&p, end, watchers, num_watchers);
+ }
+
+out_put_req:
+ ceph_osdc_put_request(req);
+ return ret;
+}
+EXPORT_SYMBOL(ceph_osdc_list_watchers);
+
/*
* Call all pending notify callbacks - for use after a watch is
* unregistered, to make sure no more callbacks for it will be invoked