#define for_each_obj_request_safe(ireq, oreq, n) \
list_for_each_entry_safe_reverse(oreq, n, &(ireq)->obj_requests, links)
-struct rbd_snap {
- const char *name;
- u64 size;
- struct list_head node;
- u64 id;
- u64 features;
-};
-
struct rbd_mapping {
u64 size;
u64 features;
struct list_head node;
- /* list of snapshots */
- struct list_head snaps;
-
/* sysfs related */
struct device dev;
unsigned long open_count; /* protected by lock */
static int rbd_img_request_submit(struct rbd_img_request *img_request);
-static int rbd_dev_snaps_update(struct rbd_device *rbd_dev);
-
static void rbd_dev_device_release(struct device *dev);
-static void rbd_snap_destroy(struct rbd_snap *snap);
static ssize_t rbd_add(struct bus_type *bus, const char *buf,
size_t count);
return ret;
}
-static void rbd_remove_all_snaps(struct rbd_device *rbd_dev)
-{
- struct rbd_snap *snap;
- struct rbd_snap *next;
-
- list_for_each_entry_safe(snap, next, &rbd_dev->snaps, node) {
- list_del(&snap->node);
- rbd_snap_destroy(snap);
- }
-}
-
static void rbd_update_mapping_size(struct rbd_device *rbd_dev)
{
if (rbd_dev->spec->snap_id != CEPH_NOSNAP)
rbd_warn(rbd_dev, "object prefix changed (ignoring)");
kfree(h.object_prefix);
- ret = rbd_dev_snaps_update(rbd_dev);
-
up_write(&rbd_dev->header_rwsem);
return ret;
spin_lock_init(&rbd_dev->lock);
rbd_dev->flags = 0;
INIT_LIST_HEAD(&rbd_dev->node);
- INIT_LIST_HEAD(&rbd_dev->snaps);
init_rwsem(&rbd_dev->header_rwsem);
rbd_dev->spec = spec;
kfree(rbd_dev);
}
-static void rbd_snap_destroy(struct rbd_snap *snap)
-{
- kfree(snap->name);
- kfree(snap);
-}
-
-static struct rbd_snap *rbd_snap_create(struct rbd_device *rbd_dev,
- const char *snap_name,
- u64 snap_id, u64 snap_size,
- u64 snap_features)
-{
- struct rbd_snap *snap;
-
- snap = kzalloc(sizeof (*snap), GFP_KERNEL);
- if (!snap)
- return ERR_PTR(-ENOMEM);
-
- snap->name = snap_name;
- snap->id = snap_id;
- snap->size = snap_size;
- snap->features = snap_features;
-
- return snap;
-}
-
-/*
- * 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,
- u64 snap_id, u64 *snap_size, u64 *snap_features)
-{
- const char *snap_name;
- u32 which;
-
- 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);
-
- *snap_size = rbd_dev->header.snap_sizes[which];
- *snap_features = 0; /* No features for v1 */
-
- return snap_name;
-}
-
/*
* Get the size and object order for an image snapshot, or if
* snap_id is CEPH_NOSNAP, gets this information for the base
* When an image being mapped (not a parent) is probed, we have the
* pool name and pool id, image name and image id, and the snapshot
* name. The only thing we're missing is the snapshot id.
- *
- * The set of snapshots for an image is not known until they have
- * been read by rbd_dev_snaps_update(), so we can't completely fill
- * in this information until after that has been called.
*/
static int rbd_dev_spec_update(struct rbd_device *rbd_dev)
{
return snap_name;
}
-static const char *rbd_dev_v2_snap_info(struct rbd_device *rbd_dev,
- u64 snap_id, u64 *snap_size, u64 *snap_features)
-{
- u64 size;
- u64 features;
- const char *snap_name;
- int ret;
-
- ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, NULL, &size);
- if (ret)
- goto out_err;
-
- ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, &features);
- if (ret)
- goto out_err;
-
- snap_name = rbd_dev_v2_snap_name(rbd_dev, snap_id);
- if (!IS_ERR(snap_name)) {
- *snap_size = size;
- *snap_features = features;
- }
-
- return snap_name;
-out_err:
- return ERR_PTR(ret);
-}
-
-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, snap_id,
- snap_size, snap_features);
- if (rbd_dev->image_format == 2)
- 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)
{
int ret;
dout("rbd_dev_v2_snap_context returned %d\n", ret);
if (ret)
goto out;
- ret = rbd_dev_snaps_update(rbd_dev);
- dout("rbd_dev_snaps_update returned %d\n", ret);
- if (ret)
- goto out;
out:
up_write(&rbd_dev->header_rwsem);
return ret;
}
-/*
- * Scan the rbd device's current snapshot list and compare it to the
- * newly-received snapshot context. Remove any existing snapshots
- * not present in the new snapshot context. Add a new snapshot for
- * any snaphots in the snapshot context not in the current list.
- * And verify there are no changes to snapshots we already know
- * about.
- *
- * Assumes the snapshots in the snapshot context are sorted by
- * snapshot id, highest id first. (Snapshots in the rbd_dev's list
- * are also maintained in that order.)
- *
- * Note that any error occurs while updating the snapshot list
- * aborts the update, and the entire list is cleared. The snapshot
- * list becomes inconsistent at that point anyway, so it might as
- * well be empty.
- */
-static int rbd_dev_snaps_update(struct rbd_device *rbd_dev)
-{
- struct ceph_snap_context *snapc = rbd_dev->header.snapc;
- const u32 snap_count = snapc->num_snaps;
- struct list_head *head = &rbd_dev->snaps;
- struct list_head *links = head->next;
- u32 index = 0;
- int ret = 0;
-
- dout("%s: snap count is %u\n", __func__, (unsigned int)snap_count);
- while (index < snap_count || links != head) {
- u64 snap_id;
- struct rbd_snap *snap;
- const char *snap_name;
- u64 snap_size = 0;
- u64 snap_features = 0;
-
- snap_id = index < snap_count ? snapc->snaps[index]
- : CEPH_NOSNAP;
- snap = links != head ? list_entry(links, struct rbd_snap, node)
- : NULL;
- rbd_assert(!snap || snap->id != CEPH_NOSNAP);
-
- if (snap_id == CEPH_NOSNAP || (snap && snap->id > snap_id)) {
- struct list_head *next = links->next;
-
- /*
- * A previously-existing snapshot is not in
- * the new snap context.
- *
- * If the now-missing snapshot is the one
- * the image represents, clear its existence
- * flag so we can avoid sending any more
- * requests to it.
- */
- if (rbd_dev->spec->snap_id == snap->id)
- clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags);
- dout("removing %ssnap id %llu\n",
- rbd_dev->spec->snap_id == snap->id ?
- "mapped " : "",
- (unsigned long long)snap->id);
-
- list_del(&snap->node);
- rbd_snap_destroy(snap);
-
- /* Done with this list entry; advance */
-
- links = next;
- continue;
- }
-
- snap_name = rbd_dev_snap_info(rbd_dev, snap_id,
- &snap_size, &snap_features);
- if (IS_ERR(snap_name)) {
- ret = PTR_ERR(snap_name);
- dout("failed to get snap info, error %d\n", ret);
- goto out_err;
- }
-
- dout("entry %u: snap_id = %llu\n", (unsigned int)snap_count,
- (unsigned long long)snap_id);
- if (!snap || (snap_id != CEPH_NOSNAP && snap->id < snap_id)) {
- struct rbd_snap *new_snap;
-
- /* We haven't seen this snapshot before */
-
- new_snap = rbd_snap_create(rbd_dev, snap_name,
- snap_id, snap_size, snap_features);
- if (IS_ERR(new_snap)) {
- ret = PTR_ERR(new_snap);
- dout(" failed to add dev, error %d\n", ret);
- goto out_err;
- }
-
- /* New goes before existing, or at end of list */
-
- dout(" added dev%s\n", snap ? "" : " at end\n");
- if (snap)
- list_add_tail(&new_snap->node, &snap->node);
- else
- list_add_tail(&new_snap->node, head);
- } else {
- /* Already have this one */
-
- dout(" already present\n");
-
- rbd_assert(snap->size == snap_size);
- rbd_assert(!strcmp(snap->name, snap_name));
- rbd_assert(snap->features == snap_features);
-
- /* Done with this list entry; advance */
-
- links = links->next;
- }
-
- /* Advance to the next entry in the snapshot context */
-
- index++;
- }
- dout("%s: done\n", __func__);
-
- return 0;
-out_err:
- rbd_remove_all_snaps(rbd_dev);
-
- return ret;
-}
-
static int rbd_bus_add_dev(struct rbd_device *rbd_dev)
{
struct device *dev;
{
int ret;
- rbd_remove_all_snaps(rbd_dev);
rbd_dev_unprobe(rbd_dev);
ret = rbd_dev_header_watch_sync(rbd_dev, 0);
if (ret)
if (ret)
goto err_out_watch;
- ret = rbd_dev_snaps_update(rbd_dev);
- if (ret)
- goto err_out_probe;
-
ret = rbd_dev_spec_update(rbd_dev);
if (ret)
- goto err_out_snaps;
+ goto err_out_probe;
ret = rbd_dev_probe_parent(rbd_dev);
if (!ret)
return 0;
-err_out_snaps:
- rbd_remove_all_snaps(rbd_dev);
err_out_probe:
rbd_dev_unprobe(rbd_dev);
err_out_watch:
projects / users / hch / xfs.git / commitdiff