drivers: dma-mapping: Do not leave an invalid area->pages pointer in dma_common_conti...

[linux.git] / net / ceph / cls_lock_client.c

diff --git a/net/ceph/cls_lock_client.c b/net/ceph/cls_lock_client.c
index b9233b9903990bd38721213ce287a8045debd8c7..08ada893f01e6acb61b5f91425539a33d7b2c0d4 100644 (file)
--- a/net/ceph/cls_lock_client.c
+++ b/net/ceph/cls_lock_client.c
@@ -179,6 +179,57 @@ int ceph_cls_break_lock(struct ceph_osd_client *osdc,
 }
 EXPORT_SYMBOL(ceph_cls_break_lock);
 
+int ceph_cls_set_cookie(struct ceph_osd_client *osdc,
+                       struct ceph_object_id *oid,
+                       struct ceph_object_locator *oloc,
+                       char *lock_name, u8 type, char *old_cookie,
+                       char *tag, char *new_cookie)
+{
+       int cookie_op_buf_size;
+       int name_len = strlen(lock_name);
+       int old_cookie_len = strlen(old_cookie);
+       int tag_len = strlen(tag);
+       int new_cookie_len = strlen(new_cookie);
+       void *p, *end;
+       struct page *cookie_op_page;
+       int ret;
+
+       cookie_op_buf_size = name_len + sizeof(__le32) +
+                            old_cookie_len + sizeof(__le32) +
+                            tag_len + sizeof(__le32) +
+                            new_cookie_len + sizeof(__le32) +
+                            sizeof(u8) + CEPH_ENCODING_START_BLK_LEN;
+       if (cookie_op_buf_size > PAGE_SIZE)
+               return -E2BIG;
+
+       cookie_op_page = alloc_page(GFP_NOIO);
+       if (!cookie_op_page)
+               return -ENOMEM;
+
+       p = page_address(cookie_op_page);
+       end = p + cookie_op_buf_size;
+
+       /* encode cls_lock_set_cookie_op struct */
+       ceph_start_encoding(&p, 1, 1,
+                           cookie_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, old_cookie, old_cookie_len);
+       ceph_encode_string(&p, end, tag, tag_len);
+       ceph_encode_string(&p, end, new_cookie, new_cookie_len);
+
+       dout("%s lock_name %s type %d old_cookie %s tag %s new_cookie %s\n",
+            __func__, lock_name, type, old_cookie, tag, new_cookie);
+       ret = ceph_osdc_call(osdc, oid, oloc, "lock", "set_cookie",
+                            CEPH_OSD_FLAG_WRITE, cookie_op_page,
+                            cookie_op_buf_size, NULL, NULL);
+
+       dout("%s: status %d\n", __func__, ret);
+       __free_page(cookie_op_page);
+       return ret;
+}
+EXPORT_SYMBOL(ceph_cls_set_cookie);
+
 void ceph_free_lockers(struct ceph_locker *lockers, u32 num_lockers)
 {
        int i;