libceph: support the RADOS copy-from operation
[sfrench/cifs-2.6.git] / net / ceph / osd_client.c
index a0148de51cc603f1ff6930e5104313fc7087fcd4..d23a9f81f3d784123f0f97aaba1b529081350fae 100644 (file)
@@ -410,6 +410,9 @@ static void osd_req_op_data_release(struct ceph_osd_request *osd_req,
        case CEPH_OSD_OP_LIST_WATCHERS:
                ceph_osd_data_release(&op->list_watchers.response_data);
                break;
+       case CEPH_OSD_OP_COPY_FROM:
+               ceph_osd_data_release(&op->copy_from.osd_data);
+               break;
        default:
                break;
        }
@@ -702,6 +705,7 @@ static void get_num_data_items(struct ceph_osd_request *req,
                case CEPH_OSD_OP_SETXATTR:
                case CEPH_OSD_OP_CMPXATTR:
                case CEPH_OSD_OP_NOTIFY_ACK:
+               case CEPH_OSD_OP_COPY_FROM:
                        *num_request_data_items += 1;
                        break;
 
@@ -1016,6 +1020,14 @@ static u32 osd_req_encode_op(struct ceph_osd_op *dst,
        case CEPH_OSD_OP_CREATE:
        case CEPH_OSD_OP_DELETE:
                break;
+       case CEPH_OSD_OP_COPY_FROM:
+               dst->copy_from.snapid = cpu_to_le64(src->copy_from.snapid);
+               dst->copy_from.src_version =
+                       cpu_to_le64(src->copy_from.src_version);
+               dst->copy_from.flags = src->copy_from.flags;
+               dst->copy_from.src_fadvise_flags =
+                       cpu_to_le32(src->copy_from.src_fadvise_flags);
+               break;
        default:
                pr_err("unsupported osd opcode %s\n",
                        ceph_osd_op_name(src->op));
@@ -1947,6 +1959,10 @@ static void setup_request_data(struct ceph_osd_request *req)
                        ceph_osdc_msg_data_add(request_msg,
                                               &op->notify_ack.request_data);
                        break;
+               case CEPH_OSD_OP_COPY_FROM:
+                       ceph_osdc_msg_data_add(request_msg,
+                                              &op->copy_from.osd_data);
+                       break;
 
                /* reply */
                case CEPH_OSD_OP_STAT:
@@ -5255,6 +5271,80 @@ int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
 }
 EXPORT_SYMBOL(ceph_osdc_writepages);
 
+static int osd_req_op_copy_from_init(struct ceph_osd_request *req,
+                                    u64 src_snapid, u64 src_version,
+                                    struct ceph_object_id *src_oid,
+                                    struct ceph_object_locator *src_oloc,
+                                    u32 src_fadvise_flags,
+                                    u32 dst_fadvise_flags,
+                                    u8 copy_from_flags)
+{
+       struct ceph_osd_req_op *op;
+       struct page **pages;
+       void *p, *end;
+
+       pages = ceph_alloc_page_vector(1, GFP_KERNEL);
+       if (IS_ERR(pages))
+               return PTR_ERR(pages);
+
+       op = _osd_req_op_init(req, 0, CEPH_OSD_OP_COPY_FROM, dst_fadvise_flags);
+       op->copy_from.snapid = src_snapid;
+       op->copy_from.src_version = src_version;
+       op->copy_from.flags = copy_from_flags;
+       op->copy_from.src_fadvise_flags = src_fadvise_flags;
+
+       p = page_address(pages[0]);
+       end = p + PAGE_SIZE;
+       ceph_encode_string(&p, end, src_oid->name, src_oid->name_len);
+       encode_oloc(&p, end, src_oloc);
+       op->indata_len = PAGE_SIZE - (end - p);
+
+       ceph_osd_data_pages_init(&op->copy_from.osd_data, pages,
+                                op->indata_len, 0, false, true);
+       return 0;
+}
+
+int ceph_osdc_copy_from(struct ceph_osd_client *osdc,
+                       u64 src_snapid, u64 src_version,
+                       struct ceph_object_id *src_oid,
+                       struct ceph_object_locator *src_oloc,
+                       u32 src_fadvise_flags,
+                       struct ceph_object_id *dst_oid,
+                       struct ceph_object_locator *dst_oloc,
+                       u32 dst_fadvise_flags,
+                       u8 copy_from_flags)
+{
+       struct ceph_osd_request *req;
+       int ret;
+
+       req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_KERNEL);
+       if (!req)
+               return -ENOMEM;
+
+       req->r_flags = CEPH_OSD_FLAG_WRITE;
+
+       ceph_oloc_copy(&req->r_t.base_oloc, dst_oloc);
+       ceph_oid_copy(&req->r_t.base_oid, dst_oid);
+
+       ret = osd_req_op_copy_from_init(req, src_snapid, src_version, src_oid,
+                                       src_oloc, src_fadvise_flags,
+                                       dst_fadvise_flags, copy_from_flags);
+       if (ret)
+               goto out;
+
+       ret = ceph_osdc_alloc_messages(req, GFP_KERNEL);
+       if (ret)
+               goto out;
+
+       ceph_osdc_start_request(osdc, req, false);
+       ret = ceph_osdc_wait_request(osdc, req);
+
+out:
+       ceph_osdc_put_request(req);
+       return ret;
+}
+EXPORT_SYMBOL(ceph_osdc_copy_from);
+
 int __init ceph_osdc_setup(void)
 {
        size_t size = sizeof(struct ceph_osd_request) +