rbd: don't (ab)use obj_req->pages for stat requests

obj_req->pages is for provided data buffers.  stat requests are
internal and should be NODATA.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 8b90473..aa3f6a6 100644 (file)
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -2645,11 +2645,9 @@ static int rbd_img_obj_exists_submit(struct rbd_obj_request *obj_request)
        struct rbd_device *rbd_dev = obj_request->img_request->rbd_dev;
        struct rbd_obj_request *stat_request;
        struct page **pages;
-       u32 page_count;
-       size_t size;
        int ret;
 
-       stat_request = rbd_obj_request_create(OBJ_REQUEST_PAGES);
+       stat_request = rbd_obj_request_create(OBJ_REQUEST_NODATA);
        if (!stat_request)
                return -ENOMEM;
 
@@ -2670,22 +2668,19 @@ static int rbd_img_obj_exists_submit(struct rbd_obj_request *obj_request)
         *         le32 tv_nsec;
         *     } mtime;
         */
-       size = sizeof (__le64) + sizeof (__le32) + sizeof (__le32);
-       page_count = (u32)calc_pages_for(0, size);
-       pages = ceph_alloc_page_vector(page_count, GFP_NOIO);
+       pages = ceph_alloc_page_vector(1, GFP_NOIO);
        if (IS_ERR(pages)) {
                ret = PTR_ERR(pages);
                goto fail_stat_request;
        }
 
        osd_req_op_init(stat_request->osd_req, 0, CEPH_OSD_OP_STAT, 0);
-       osd_req_op_raw_data_in_pages(stat_request->osd_req, 0, pages, size, 0,
-                                    false, false);
+       osd_req_op_raw_data_in_pages(stat_request->osd_req, 0, pages,
+                                    8 + sizeof(struct ceph_timespec),
+                                    0, false, true);
 
        rbd_obj_request_get(obj_request);
        stat_request->obj_request = obj_request;
-       stat_request->pages = pages;
-       stat_request->page_count = page_count;
        stat_request->callback = rbd_img_obj_exists_callback;
 
        rbd_obj_request_submit(stat_request);