bool first_time = rbd_dev->header.object_prefix == NULL;
int ret;
- ret = rbd_dev_v2_image_size(rbd_dev);
- if (ret)
- return ret;
+ if (!first_time)
+ {
+ ret = rbd_dev_v2_image_size(rbd_dev);
+ if (ret)
+ return ret;
- if (first_time) {
+ ret = rbd_dev_v2_snap_context(rbd_dev);
+ dout("rbd_dev_v2_snap_context returned %d\n", ret);
+ return ret;
+ }
+ else
+ {
ret = rbd_dev_v2_header_onetime(rbd_dev);
if (ret)
return ret;
}
-
- ret = rbd_dev_v2_snap_context(rbd_dev);
- dout("rbd_dev_v2_snap_context returned %d\n", ret);
-
- return ret;
+ return ret; /* XXX change logic? */
}
static int rbd_dev_header_info(struct rbd_device *rbd_dev)
memset(header, 0, sizeof (*header));
}
+static struct ceph_osd_request * rbd_obj_header_req_alloc(
+ struct rbd_device *rbd_dev,
+ int num_ops)
+{
+ struct ceph_osd_request *osd_req;
+ struct page ***replies;
+
+ replies = kmalloc(CEPH_OSD_MAX_OP * sizeof(*replies), GFP_KERNEL);
+ if (!replies)
+ return NULL;
+
+ osd_req = ceph_osdc_alloc_request(&rbd_dev->rbd_client->client->osdc,
+ NULL, num_ops, false, GFP_KERNEL);
+ if (!osd_req) {
+ kfree(replies);
+ return NULL;
+ }
+
+ osd_req->r_flags = CEPH_OSD_FLAG_READ;
+ osd_req->r_base_oloc.pool = ceph_file_layout_pg_pool(rbd_dev->layout);
+ osd_req->r_priv = replies;
+ ceph_oid_set_name(&osd_req->r_base_oid, rbd_dev->header_name);
+
+ return osd_req;
+}
+
+static int rbd_obj_header_method_add(struct ceph_osd_request *osd_req,
+ int which,
+ const char *class_name,
+ const char *method_name,
+ const void *outbound,
+ size_t outbound_size,
+ size_t inbound_size)
+{
+ u32 page_count;
+ struct page ***replies = osd_req->r_priv;
+
+ BUG_ON(which >= osd_req->r_num_ops);
+
+ osd_req_op_cls_init(osd_req, which, CEPH_OSD_OP_CALL,
+ class_name, method_name);
+
+ if (outbound_size) {
+ struct ceph_pagelist *pagelist;
+ pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
+ /* XXX is this ever freed? */
+ if (!pagelist)
+ return -ENOMEM;
+
+ ceph_pagelist_init(pagelist);
+ ceph_pagelist_append(pagelist, outbound, outbound_size);
+ osd_req_op_cls_request_data_pagelist(osd_req, which, pagelist);
+ }
+
+ page_count = (u32)calc_pages_for(0, inbound_size);
+ replies[which] = ceph_alloc_page_vector(page_count, GFP_KERNEL);
+ if (IS_ERR(replies[which]))
+ return PTR_ERR(replies[which]);
+ osd_req_op_cls_response_data_pages(osd_req, which, replies[which],
+ inbound_size, 0, false, false);
+
+ return 0;
+}
+
+static int rbd_obj_header_req_exec(struct rbd_device * rbd_dev,
+ struct ceph_osd_request *osd_req)
+{
+ int ret;
+
+ ceph_osdc_build_request(osd_req, 0, NULL, cpu_to_le64(CEPH_NOSNAP), NULL);
+ ret = ceph_osdc_start_request(&rbd_dev->rbd_client->client->osdc,
+ osd_req, false);
+ if (ret) {
+ ceph_osdc_put_request(osd_req);
+ return ret;
+ }
+
+ ret = ceph_osdc_wait_request(&rbd_dev->rbd_client->client->osdc, osd_req);
+ if (ret < 0) {
+ ceph_osdc_cancel_request(osd_req);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int rbd_obj_header_method_retrieve(struct ceph_osd_request *osd_req,
+ int which, void *buf, size_t length)
+{
+ struct page ***replies = (struct page ***)osd_req->r_priv;
+ size_t reply_length = osd_req->r_reply_op_len[which];
+
+ BUG_ON(reply_length > length);
+
+ ceph_copy_from_page_vector(replies[which], buf, 0, reply_length);
+ ceph_release_page_vector(replies[which], calc_pages_for(0, reply_length));
+
+ return reply_length;
+}
+
+static void rbd_obj_header_req_destroy(struct ceph_osd_request *osd_req)
+{
+ if (osd_req) {
+ kfree(osd_req->r_priv);
+ ceph_osdc_put_request(osd_req);
+ }
+}
+
+static int __extract_prefix(struct rbd_device *rbd_dev,
+ struct ceph_osd_request *osd_req,
+ int which)
+{
+ void *prefix_buf;
+ void * p;
+ size_t prefix_buflen;
+ int ret;
+
+ prefix_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, GFP_KERNEL);
+ if (!prefix_buf)
+ return -ENOMEM;
+
+ prefix_buflen = rbd_obj_header_method_retrieve(osd_req, which,
+ prefix_buf, RBD_OBJ_PREFIX_LEN_MAX);
+ p = prefix_buf;
+ rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p,
+ p + prefix_buflen, NULL, GFP_KERNEL);
+
+ if (IS_ERR(rbd_dev->header.object_prefix)) {
+ ret = PTR_ERR(rbd_dev->header.object_prefix);
+ rbd_dev->header.object_prefix = NULL;
+ goto out_err;
+ }
+
+ ret = 0;
+
+out_err:
+ kfree(prefix_buf);
+ return ret;
+}
+
+static int __extract_features(struct rbd_device *rbd_dev,
+ struct ceph_osd_request *osd_req,
+ int which)
+{
+ int ret;
+ struct {
+ __le64 features;
+ __le64 incompat;
+ } __attribute__((packed)) features_buf = { 0 };
+ u64 incompat;
+
+ rbd_obj_header_method_retrieve(osd_req, which,
+ &features_buf, sizeof(features_buf));
+ incompat = le64_to_cpu(features_buf.incompat);
+ if (incompat & ~RBD_FEATURES_SUPPORTED) {
+ ret = -ENXIO;
+ goto out_err;
+ }
+ rbd_dev->header.features = le64_to_cpu(features_buf.features);
+
+ ret = 0;
+
+out_err:
+ return ret;
+}
+
+static int __extract_snapcontext(struct rbd_device *rbd_dev,
+ struct ceph_osd_request *osd_req,
+ int which)
+{
+ void *snapc_buf;
+ size_t snapc_max;
+ size_t snapc_buflen;
+
+ void *p;
+ void *q;
+
+ struct ceph_snap_context * snapc;
+
+ u32 seq;
+ u32 snap_count;
+
+ int i;
+ int ret;
+
+ snapc_max = sizeof(__le64) + sizeof(__le32) +
+ RBD_MAX_SNAP_COUNT * sizeof(__le64);
+
+ snapc_buf = kzalloc(snapc_max, GFP_KERNEL);
+ if (!snapc_buf) {
+ ret = -ENOMEM;
+ goto out_err;
+ }
+
+ snapc_buflen = rbd_obj_header_method_retrieve(osd_req, which,
+ snapc_buf, snapc_max);
+
+ p = snapc_buf;
+ q = snapc_buf + snapc_buflen;
+ ret = -ERANGE;
+ ceph_decode_64_safe(&p, q, seq, out_err);
+ ceph_decode_32_safe(&p, q, snap_count, out_err);
+
+ if (snap_count > (SIZE_MAX - sizeof(struct ceph_snap_context)) /
+ sizeof(u64)) {
+ ret = -EINVAL;
+ goto out_err;
+ }
+ if (!ceph_has_room(&p, q, snap_count * sizeof(__le64)))
+ goto out_err;
+
+ snapc = ceph_create_snap_context(snap_count, GFP_KERNEL);
+ if (!snapc) {
+ ret = -ENOMEM;
+ }
+
+ snapc->seq = seq;
+ for (i=0; i < snap_count; i++)
+ snapc->snaps[i] = ceph_decode_64(&p);
+ ceph_put_snap_context(rbd_dev->header.snapc);
+ rbd_dev->header.snapc = snapc;
+
+ ret = 0;
+out_err:
+ kfree(snapc_buf);
+ return ret;
+}
+
+static int __extract_size(struct rbd_device *rbd_dev,
+ struct ceph_osd_request *osd_req,
+ int which)
+{
+ struct {
+ u8 order;
+ __le64 size;
+ } __attribute((packed)) size_buf = { 0 };
+
+ rbd_obj_header_method_retrieve(osd_req, which, &size_buf, sizeof(size_buf));
+
+ rbd_dev->header.obj_order = size_buf.order;
+ rbd_dev->header.image_size = le64_to_cpu(size_buf.size);
+
+ return 0;
+}
+
static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev)
{
int ret;
- ret = rbd_dev_v2_object_prefix(rbd_dev);
+ size_t snapc_max;
+ __le64 snapid = cpu_to_le64(CEPH_NOSNAP);
+ struct ceph_osd_request *osd_req;
+
+ snapc_max = sizeof(__le64) + sizeof(__le32) +
+ RBD_MAX_SNAP_COUNT * sizeof(__le64);
+
+ osd_req = rbd_obj_header_req_alloc(rbd_dev, 4);
+
+ if (!osd_req) {
+ ret = -ENOMEM;
+ goto out_err;
+ }
+
+ ret = rbd_obj_header_method_add(osd_req, 0,
+ "rbd", "get_object_prefix",
+ NULL, 0, RBD_OBJ_PREFIX_LEN_MAX);
if (ret)
goto out_err;
- /*
- * Get the and check features for the image. Currently the
- * features are assumed to never change.
- */
- ret = rbd_dev_v2_features(rbd_dev);
+ ret = rbd_obj_header_method_add(osd_req, 1,
+ "rbd", "get_features",
+ &snapid, sizeof(snapid),
+ sizeof(struct{__le64 features;__le64 incompat;} __attribute__((packed))));
if (ret)
goto out_err;
- /* If the image supports fancy striping, get its parameters */
+ ret = rbd_obj_header_method_add(osd_req, 2,
+ "rbd", "get_snapcontext",
+ NULL, 0, snapc_max);
+ if (ret)
+ goto out_err;
- if (rbd_dev->header.features & RBD_FEATURE_STRIPINGV2) {
- ret = rbd_dev_v2_striping_info(rbd_dev);
- if (ret < 0)
- goto out_err;
- }
- /* No support for crypto and compression type format 2 images */
+ ret = rbd_obj_header_method_add(osd_req, 3,
+ "rbd", "get_size",
+ &snapid, sizeof(snapid),
+ sizeof(struct{u8 order; __le64 size;}__attribute((packed))));
+ if (ret)
+ goto out_err;
+
+ ret = rbd_obj_header_req_exec(rbd_dev, osd_req);
+ if (ret)
+ goto out_err;
+
+ if ((ret = __extract_prefix(rbd_dev, osd_req, 0)))
+ goto out_err;
+ if ((ret = __extract_features(rbd_dev, osd_req, 1)))
+ goto out_err;
+ if ((ret = __extract_snapcontext(rbd_dev, osd_req, 2)))
+ goto out_err;
+ if ((ret = __extract_size(rbd_dev, osd_req, 3)))
+ goto out_err;
+
+ ret = 0;
- return 0;
out_err:
- rbd_dev->header.features = 0;
- kfree(rbd_dev->header.object_prefix);
- rbd_dev->header.object_prefix = NULL;
+ rbd_obj_header_req_destroy(osd_req);
return ret;
}
projects / ceph-client.git / commitdiff