libceph: change ceph_osdc_call() to take page vector for response

This will be used for loading object map.  rbd_obj_read_sync() isn't
suitable because object map must be accessed through class methods.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Dongsheng Yang <dongsheng.yang@easystack.cn>
Reviewed-by: Jeff Layton <jlayton@kernel.org>

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 6d1df82..f0814c1 100644 (file)
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -4076,7 +4076,7 @@ static int rbd_obj_method_sync(struct rbd_device *rbd_dev,
 
        ret = ceph_osdc_call(osdc, oid, oloc, RBD_DRV_NAME, method_name,
                             CEPH_OSD_FLAG_READ, req_page, outbound_size,
-                            reply_page, &inbound_size);
+                            &reply_page, &inbound_size);
        if (!ret) {
                memcpy(inbound, page_address(reply_page), inbound_size);
                ret = inbound_size;
@@ -5102,7 +5102,7 @@ static int __get_parent_info(struct rbd_device *rbd_dev,
 
        ret = ceph_osdc_call(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc,
                             "rbd", "parent_get", CEPH_OSD_FLAG_READ,
-                            req_page, sizeof(u64), reply_page, &reply_len);
+                            req_page, sizeof(u64), &reply_page, &reply_len);
        if (ret)
                return ret == -EOPNOTSUPP ? 1 : ret;
 
@@ -5114,7 +5114,7 @@ static int __get_parent_info(struct rbd_device *rbd_dev,
 
        ret = ceph_osdc_call(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc,
                             "rbd", "parent_overlap_get", CEPH_OSD_FLAG_READ,
-                            req_page, sizeof(u64), reply_page, &reply_len);
+                            req_page, sizeof(u64), &reply_page, &reply_len);
        if (ret)
                return ret;
 
@@ -5145,7 +5145,7 @@ static int __get_parent_info_legacy(struct rbd_device *rbd_dev,
 
        ret = ceph_osdc_call(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc,
                             "rbd", "get_parent", CEPH_OSD_FLAG_READ,
-                            req_page, sizeof(u64), reply_page, &reply_len);
+                            req_page, sizeof(u64), &reply_page, &reply_len);
        if (ret)
                return ret;
 

diff --git a/include/linux/ceph/osd_client.h b/include/linux/ceph/osd_client.h
index 024f6fe..c567cfa 100644 (file)
--- a/include/linux/ceph/osd_client.h
+++ b/include/linux/ceph/osd_client.h
@@ -497,7 +497,7 @@ int ceph_osdc_call(struct ceph_osd_client *osdc,
                   const char *class, const char *method,
                   unsigned int flags,
                   struct page *req_page, size_t req_len,
-                  struct page *resp_page, size_t *resp_len);
+                  struct page **resp_pages, size_t *resp_len);
 
 extern int ceph_osdc_readpages(struct ceph_osd_client *osdc,
                               struct ceph_vino vino,

diff --git a/net/ceph/cls_lock_client.c b/net/ceph/cls_lock_client.c
index b1d12bf..fb59094 100644 (file)
--- a/net/ceph/cls_lock_client.c
+++ b/net/ceph/cls_lock_client.c
@@ -363,7 +363,7 @@ int ceph_cls_lock_info(struct ceph_osd_client *osdc,
        dout("%s lock_name %s\n", __func__, lock_name);
        ret = ceph_osdc_call(osdc, oid, oloc, "lock", "get_info",
                             CEPH_OSD_FLAG_READ, get_info_op_page,
-                            get_info_op_buf_size, reply_page, &reply_len);
+                            get_info_op_buf_size, &reply_page, &reply_len);
 
        dout("%s: status %d\n", __func__, ret);
        if (ret >= 0) {

diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index 6495982..a90fbfc 100644 (file)
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -5050,12 +5050,12 @@ int ceph_osdc_call(struct ceph_osd_client *osdc,
                   const char *class, const char *method,
                   unsigned int flags,
                   struct page *req_page, size_t req_len,
-                  struct page *resp_page, size_t *resp_len)
+                  struct page **resp_pages, size_t *resp_len)
 {
        struct ceph_osd_request *req;
        int ret;
 
-       if (req_len > PAGE_SIZE || (resp_page && *resp_len > PAGE_SIZE))
+       if (req_len > PAGE_SIZE)
                return -E2BIG;
 
        req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_NOIO);
@@ -5073,8 +5073,8 @@ int ceph_osdc_call(struct ceph_osd_client *osdc,
        if (req_page)
                osd_req_op_cls_request_data_pages(req, 0, &req_page, req_len,
                                                  0, false, false);
-       if (resp_page)
-               osd_req_op_cls_response_data_pages(req, 0, &resp_page,
+       if (resp_pages)
+               osd_req_op_cls_response_data_pages(req, 0, resp_pages,
                                                   *resp_len, 0, false, false);
 
        ret = ceph_osdc_alloc_messages(req, GFP_NOIO);
@@ -5085,7 +5085,7 @@ int ceph_osdc_call(struct ceph_osd_client *osdc,
        ret = ceph_osdc_wait_request(osdc, req);
        if (ret >= 0) {
                ret = req->r_ops[0].rval;
-               if (resp_page)
+               if (resp_pages)
                        *resp_len = req->r_ops[0].outdata_len;
        }