+
/*
rbd.c -- Export ceph rados objects as a Linux block device
#define RBD_SNAP_HEAD_NAME "-"
+#define BAD_SNAP_INDEX U32_MAX /* invalid index into snap array */
+
/* This allows a single page to hold an image name sent by OSD */
#define RBD_IMAGE_NAME_LEN_MAX (PAGE_SIZE - sizeof (__le32) - 1)
#define RBD_IMAGE_ID_LEN_MAX 64
u64 stripe_unit;
u64 stripe_count;
-
- u64 obj_version;
};
/*
struct ceph_osd_request *osd_req;
u64 xferred; /* bytes transferred */
- u64 version;
int result;
rbd_obj_callback_t callback;
static void rbd_img_parent_read(struct rbd_obj_request *obj_request);
static void rbd_dev_remove_parent(struct rbd_device *rbd_dev);
-static int rbd_dev_refresh(struct rbd_device *rbd_dev, u64 *hver);
-static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev, u64 *hver);
+static int rbd_dev_refresh(struct rbd_device *rbd_dev);
+static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev);
+static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev,
+ u64 snap_id);
static int rbd_open(struct block_device *bdev, fmode_t mode)
{
return -ENOMEM;
}
-static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id)
+static const char *_rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, u32 which)
{
- struct rbd_snap *snap;
+ const char *snap_name;
+
+ rbd_assert(which < rbd_dev->header.snapc->num_snaps);
+
+ /* Skip over names until we find the one we are looking for */
+
+ snap_name = rbd_dev->header.snap_names;
+ while (which--)
+ snap_name += strlen(snap_name) + 1;
+
+ return kstrdup(snap_name, GFP_KERNEL);
+}
+
+static u32 rbd_dev_snap_index(struct rbd_device *rbd_dev, u64 snap_id)
+{
+ struct ceph_snap_context *snapc = rbd_dev->header.snapc;
+ u32 which;
+
+ for (which = 0; which < snapc->num_snaps; which++)
+ if (snapc->snaps[which] == snap_id)
+ return which;
+
+ return BAD_SNAP_INDEX;
+}
+
+static const char *rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, u64 snap_id)
+{
+ u32 which;
+
+ which = rbd_dev_snap_index(rbd_dev, snap_id);
+ if (which == BAD_SNAP_INDEX)
+ return NULL;
+ return _rbd_dev_v1_snap_name(rbd_dev, which);
+}
+
+static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id)
+{
if (snap_id == CEPH_NOSNAP)
return RBD_SNAP_HEAD_NAME;
- list_for_each_entry(snap, &rbd_dev->snaps, node)
- if (snap_id == snap->id)
- return snap->name;
+ rbd_assert(rbd_image_format_valid(rbd_dev->image_format));
+ if (rbd_dev->image_format == 1)
+ return rbd_dev_v1_snap_name(rbd_dev, snap_id);
- return NULL;
+ return rbd_dev_v2_snap_name(rbd_dev, snap_id);
}
static struct rbd_snap *snap_by_name(struct rbd_device *rbd_dev,
if (osd_req->r_result < 0)
obj_request->result = osd_req->r_result;
- obj_request->version = le64_to_cpu(osd_req->r_reassert_version.version);
BUG_ON(osd_req->r_num_ops > 2);
obj_request_done_set(obj_request);
}
-static int rbd_obj_notify_ack(struct rbd_device *rbd_dev,
- u64 ver, u64 notify_id)
+static int rbd_obj_notify_ack(struct rbd_device *rbd_dev, u64 notify_id)
{
struct rbd_obj_request *obj_request;
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
obj_request->callback = rbd_obj_request_put;
osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_NOTIFY_ACK,
- notify_id, ver, 0);
+ notify_id, 0, 0);
rbd_osd_req_format_read(obj_request);
ret = rbd_obj_request_submit(osdc, obj_request);
static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data)
{
struct rbd_device *rbd_dev = (struct rbd_device *)data;
- u64 hver;
if (!rbd_dev)
return;
dout("%s: \"%s\" notify_id %llu opcode %u\n", __func__,
- rbd_dev->header_name, (unsigned long long) notify_id,
- (unsigned int) opcode);
- (void)rbd_dev_refresh(rbd_dev, &hver);
+ rbd_dev->header_name, (unsigned long long)notify_id,
+ (unsigned int)opcode);
+ (void)rbd_dev_refresh(rbd_dev);
- rbd_obj_notify_ack(rbd_dev, hver, notify_id);
+ rbd_obj_notify_ack(rbd_dev, notify_id);
}
/*
rbd_dev->watch_request->osd_req);
osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_WATCH,
- rbd_dev->watch_event->cookie,
- rbd_dev->header.obj_version, start);
+ rbd_dev->watch_event->cookie, 0, start);
rbd_osd_req_format_write(obj_request);
ret = rbd_obj_request_submit(osdc, obj_request);
const void *outbound,
size_t outbound_size,
void *inbound,
- size_t inbound_size,
- u64 *version)
+ size_t inbound_size)
{
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
struct rbd_obj_request *obj_request;
rbd_assert(obj_request->xferred < (u64)INT_MAX);
ret = (int)obj_request->xferred;
ceph_copy_from_page_vector(pages, inbound, 0, obj_request->xferred);
- if (version)
- *version = obj_request->version;
out:
if (obj_request)
rbd_obj_request_put(obj_request);
static int rbd_obj_read_sync(struct rbd_device *rbd_dev,
const char *object_name,
- u64 offset, u64 length,
- void *buf, u64 *version)
+ u64 offset, u64 length, void *buf)
{
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
rbd_assert(obj_request->xferred <= (u64) SIZE_MAX);
size = (size_t) obj_request->xferred;
ceph_copy_from_page_vector(pages, buf, 0, size);
- rbd_assert(size <= (size_t) INT_MAX);
- ret = (int) size;
- if (version)
- *version = obj_request->version;
+ rbd_assert(size <= (size_t)INT_MAX);
+ ret = (int)size;
out:
if (obj_request)
rbd_obj_request_put(obj_request);
* Returns a pointer-coded errno if a failure occurs.
*/
static struct rbd_image_header_ondisk *
-rbd_dev_v1_header_read(struct rbd_device *rbd_dev, u64 *version)
+rbd_dev_v1_header_read(struct rbd_device *rbd_dev)
{
struct rbd_image_header_ondisk *ondisk = NULL;
u32 snap_count = 0;
return ERR_PTR(-ENOMEM);
ret = rbd_obj_read_sync(rbd_dev, rbd_dev->header_name,
- 0, size, ondisk, version);
+ 0, size, ondisk);
if (ret < 0)
goto out_err;
if ((size_t)ret < size) {
struct rbd_image_header *header)
{
struct rbd_image_header_ondisk *ondisk;
- u64 ver = 0;
int ret;
- ondisk = rbd_dev_v1_header_read(rbd_dev, &ver);
+ ondisk = rbd_dev_v1_header_read(rbd_dev);
if (IS_ERR(ondisk))
return PTR_ERR(ondisk);
ret = rbd_header_from_disk(header, ondisk);
- if (ret >= 0)
- header->obj_version = ver;
kfree(ondisk);
return ret;
/*
* only read the first part of the ondisk header, without the snaps info
*/
-static int rbd_dev_v1_refresh(struct rbd_device *rbd_dev, u64 *hver)
+static int rbd_dev_v1_refresh(struct rbd_device *rbd_dev)
{
int ret;
struct rbd_image_header h;
/* osd requests may still refer to snapc */
ceph_put_snap_context(rbd_dev->header.snapc);
- if (hver)
- *hver = h.obj_version;
- rbd_dev->header.obj_version = h.obj_version;
rbd_dev->header.image_size = h.image_size;
rbd_dev->header.snapc = h.snapc;
rbd_dev->header.snap_names = h.snap_names;
return ret;
}
-static int rbd_dev_refresh(struct rbd_device *rbd_dev, u64 *hver)
+static int rbd_dev_refresh(struct rbd_device *rbd_dev)
{
u64 image_size;
int ret;
image_size = rbd_dev->header.image_size;
mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
if (rbd_dev->image_format == 1)
- ret = rbd_dev_v1_refresh(rbd_dev, hver);
+ ret = rbd_dev_v1_refresh(rbd_dev);
else
- ret = rbd_dev_v2_refresh(rbd_dev, hver);
+ ret = rbd_dev_v2_refresh(rbd_dev);
mutex_unlock(&ctl_mutex);
if (ret)
rbd_warn(rbd_dev, "got notification but failed to "
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
int ret;
- ret = rbd_dev_refresh(rbd_dev, NULL);
+ ret = rbd_dev_refresh(rbd_dev);
return ret < 0 ? ret : size;
}
* Returns a dynamically-allocated snapshot name if successful, or a
* pointer-coded error otherwise.
*/
-static const char *rbd_dev_v1_snap_info(struct rbd_device *rbd_dev, u32 which,
- u64 *snap_size, u64 *snap_features)
+static const char *rbd_dev_v1_snap_info(struct rbd_device *rbd_dev,
+ u64 snap_id, u64 *snap_size, u64 *snap_features)
{
const char *snap_name;
- int i;
-
- rbd_assert(which < rbd_dev->header.snapc->num_snaps);
-
- /* Skip over names until we find the one we are looking for */
-
- snap_name = rbd_dev->header.snap_names;
- for (i = 0; i < which; i++)
- snap_name += strlen(snap_name) + 1;
+ u32 which;
- snap_name = kstrdup(snap_name, GFP_KERNEL);
+ which = rbd_dev_snap_index(rbd_dev, snap_id);
+ if (which == BAD_SNAP_INDEX)
+ return ERR_PTR(-ENOENT);
+ snap_name = _rbd_dev_v1_snap_name(rbd_dev, which);
if (!snap_name)
return ERR_PTR(-ENOMEM);
ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name,
"rbd", "get_size",
&snapid, sizeof (snapid),
- &size_buf, sizeof (size_buf), NULL);
+ &size_buf, sizeof (size_buf));
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
if (ret < 0)
return ret;
ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name,
"rbd", "get_object_prefix", NULL, 0,
- reply_buf, RBD_OBJ_PREFIX_LEN_MAX, NULL);
+ reply_buf, RBD_OBJ_PREFIX_LEN_MAX);
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
if (ret < 0)
goto out;
ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name,
"rbd", "get_features",
&snapid, sizeof (snapid),
- &features_buf, sizeof (features_buf), NULL);
+ &features_buf, sizeof (features_buf));
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
if (ret < 0)
return ret;
ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name,
"rbd", "get_parent",
&snapid, sizeof (snapid),
- reply_buf, size, NULL);
+ reply_buf, size);
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
if (ret < 0)
goto out_err;
ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name,
"rbd", "get_stripe_unit_count", NULL, 0,
- (char *)&striping_info_buf, size, NULL);
+ (char *)&striping_info_buf, size);
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
if (ret < 0)
return ret;
ret = rbd_obj_method_sync(rbd_dev, RBD_DIRECTORY,
"rbd", "dir_get_name",
image_id, image_id_size,
- reply_buf, size, NULL);
+ reply_buf, size);
if (ret < 0)
goto out;
p = reply_buf;
/* Look up the snapshot name, and make a copy */
snap_name = rbd_snap_name(rbd_dev, spec->snap_id);
- if (!snap_name) {
- rbd_warn(rbd_dev, "no snapshot with id %llu", spec->snap_id);
- ret = -EIO;
- goto out_err;
- }
- snap_name = kstrdup(snap_name, GFP_KERNEL);
if (!snap_name) {
ret = -ENOMEM;
goto out_err;
return ret;
}
-static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev, u64 *ver)
+static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev)
{
size_t size;
int ret;
ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name,
"rbd", "get_snapcontext", NULL, 0,
- reply_buf, size, ver);
+ reply_buf, size);
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
if (ret < 0)
goto out;
return ret;
}
-static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, u32 which)
+static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev,
+ u64 snap_id)
{
size_t size;
void *reply_buf;
- __le64 snap_id;
+ __le64 snapid;
int ret;
void *p;
void *end;
if (!reply_buf)
return ERR_PTR(-ENOMEM);
- rbd_assert(which < rbd_dev->header.snapc->num_snaps);
- snap_id = cpu_to_le64(rbd_dev->header.snapc->snaps[which]);
+ snapid = cpu_to_le64(snap_id);
ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name,
"rbd", "get_snapshot_name",
- &snap_id, sizeof (snap_id),
- reply_buf, size, NULL);
+ &snapid, sizeof (snapid),
+ reply_buf, size);
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
if (ret < 0) {
snap_name = ERR_PTR(ret);
goto out;
dout(" snap_id 0x%016llx snap_name = %s\n",
- (unsigned long long)le64_to_cpu(snap_id), snap_name);
+ (unsigned long long)snap_id, snap_name);
out:
kfree(reply_buf);
return snap_name;
}
-static const char *rbd_dev_v2_snap_info(struct rbd_device *rbd_dev, u32 which,
- u64 *snap_size, u64 *snap_features)
+static const char *rbd_dev_v2_snap_info(struct rbd_device *rbd_dev,
+ u64 snap_id, u64 *snap_size, u64 *snap_features)
{
- u64 snap_id;
u64 size;
u64 features;
const char *snap_name;
int ret;
- rbd_assert(which < rbd_dev->header.snapc->num_snaps);
- snap_id = rbd_dev->header.snapc->snaps[which];
ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, NULL, &size);
if (ret)
goto out_err;
if (ret)
goto out_err;
- snap_name = rbd_dev_v2_snap_name(rbd_dev, which);
+ snap_name = rbd_dev_v2_snap_name(rbd_dev, snap_id);
if (!IS_ERR(snap_name)) {
*snap_size = size;
*snap_features = features;
return ERR_PTR(ret);
}
-static const char *rbd_dev_snap_info(struct rbd_device *rbd_dev, u32 which,
- u64 *snap_size, u64 *snap_features)
+static const char *rbd_dev_snap_info(struct rbd_device *rbd_dev,
+ u64 snap_id, u64 *snap_size, u64 *snap_features)
{
if (rbd_dev->image_format == 1)
- return rbd_dev_v1_snap_info(rbd_dev, which,
+ return rbd_dev_v1_snap_info(rbd_dev, snap_id,
snap_size, snap_features);
if (rbd_dev->image_format == 2)
- return rbd_dev_v2_snap_info(rbd_dev, which,
+ return rbd_dev_v2_snap_info(rbd_dev, snap_id,
snap_size, snap_features);
return ERR_PTR(-EINVAL);
}
-static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev, u64 *hver)
+static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev)
{
int ret;
goto out;
rbd_update_mapping_size(rbd_dev);
- ret = rbd_dev_v2_snap_context(rbd_dev, hver);
+ ret = rbd_dev_v2_snap_context(rbd_dev);
dout("rbd_dev_v2_snap_context returned %d\n", ret);
if (ret)
goto out;
continue;
}
- snap_name = rbd_dev_snap_info(rbd_dev, index,
+ snap_name = rbd_dev_snap_info(rbd_dev, snap_id,
&snap_size, &snap_features);
if (IS_ERR(snap_name)) {
ret = PTR_ERR(snap_name);
ret = rbd_obj_method_sync(rbd_dev, object_name,
"rbd", "get_id", NULL, 0,
- response, RBD_IMAGE_ID_LEN_MAX, NULL);
+ response, RBD_IMAGE_ID_LEN_MAX);
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
if (ret == -ENOENT) {
image_id = kstrdup("", GFP_KERNEL);
static int rbd_dev_v2_probe(struct rbd_device *rbd_dev)
{
int ret;
- u64 ver = 0;
ret = rbd_dev_v2_image_size(rbd_dev);
if (ret)
/* Get the snapshot context, plus the header version */
- ret = rbd_dev_v2_snap_context(rbd_dev, &ver);
+ ret = rbd_dev_v2_snap_context(rbd_dev);
if (ret)
goto out_err;
- rbd_dev->header.obj_version = ver;
dout("discovered version 2 image, header name is %s\n",
rbd_dev->header_name);
projects / ~andy / linux / blobdiff