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rbd: don't create sysfs entries for non-mapped snapshots 

When an rbd image gets mapped a device entry gets created for it
under /sys/bus/rbd/devices/<id>/.  Inside that directory there are
sysfs files that contain information about the image: its size,
feature bits, major device number, and so on.

Additionally, if that image has any snapshots, a device entry gets
created for each of those as a "child" of the mapped device.  Each
of these is a subdirectory of the mapped device, and each directory
contains a few files with information about the snapshot (its
snapshot id, size, and feature mask).

There is no clear benefit to having those device entries for the
snapshots.  The information provided via sysfs of of little real
value--and all of it is available via rbd CLI commands.  If we
still wanted to see the kernel's view of this information it could
be done much more simply by including it in a single sysfs file for
the mapped image.

But there *is* a clear cost to supporting them.  Every time a snapshot
context changes, these entries need to be updated (deleted snapshots
removed, new snapshots created).  The rbd driver is notified of
changes to the snapshot context via callbacks from an osd, and care
must be taken to coordinate removal of snapshot data structures
with the possibility of one these notifications occurring.

Things would be considerably simpler if we just didn't have to
maintain device entries for the snapshots.

So get rid of them.

The ability to map a snapshot of an rbd image will remain; the only
thing lost will be the ability to query these sysfs directories for
information about snapshots of mapped images.

This resolves:
    http://tracker.ceph.com/issues/4796

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2013-04-23 13:52:53 -05:00 committed by Sage Weil
parent 9ef1ee5a1b
commit 3e83b65bb9
2 changed files with 4 additions and 153 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
Documentation/ABI/testing/sysfs-bus-rbd
View File

@ -66,27 +66,7 @@ current_snap
The current snapshot for which the device is mapped.
snap_*
A directory per each snapshot
parent
Information identifying the pool, image, and snapshot id for
the parent image in a layered rbd image (format 2 only).
Entries under /sys/bus/rbd/devices/<dev-id>/snap_<snap-name>
-------------------------------------------------------------
snap_id
The rados internal snapshot id assigned for this snapshot
snap_size
The size of the image when this snapshot was taken.
snap_features
A hexadecimal encoding of the feature bits for this snapshot.

137
drivers/block/rbd.c
View File

@ -272,7 +272,6 @@ struct rbd_img_request {
list_for_each_entry_safe_reverse(oreq, n, &(ireq)->obj_requests, links)
struct rbd_snap {
struct device dev;
const char *name;
u64 size;
struct list_head node;
@ -358,7 +357,6 @@ static DEFINE_SPINLOCK(rbd_client_list_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 int rbd_dev_snaps_register(struct rbd_device *rbd_dev);
static void rbd_dev_release(struct device *dev);
static void rbd_remove_snap_dev(struct rbd_snap *snap);
@ -3069,8 +3067,6 @@ static int rbd_dev_v1_refresh(struct rbd_device *rbd_dev, u64 *hver)
kfree(h.object_prefix);
ret = rbd_dev_snaps_update(rbd_dev);
if (!ret)
ret = rbd_dev_snaps_register(rbd_dev);
up_write(&rbd_dev->header_rwsem);
@ -3344,71 +3340,6 @@ static struct device_type rbd_device_type = {
.release = rbd_sysfs_dev_release,
};
/*
sysfs - snapshots
*/
static ssize_t rbd_snap_size_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev);
return sprintf(buf, "%llu\n", (unsigned long long)snap->size);
}
static ssize_t rbd_snap_id_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev);
return sprintf(buf, "%llu\n", (unsigned long long)snap->id);
}
static ssize_t rbd_snap_features_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev);
return sprintf(buf, "0x%016llx\n",
(unsigned long long) snap->features);
}
static DEVICE_ATTR(snap_size, S_IRUGO, rbd_snap_size_show, NULL);
static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL);
static DEVICE_ATTR(snap_features, S_IRUGO, rbd_snap_features_show, NULL);
static struct attribute *rbd_snap_attrs[] = {
&dev_attr_snap_size.attr,
&dev_attr_snap_id.attr,
&dev_attr_snap_features.attr,
NULL,
};
static struct attribute_group rbd_snap_attr_group = {
.attrs = rbd_snap_attrs,
};
static void rbd_snap_dev_release(struct device *dev)
{
struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev);
kfree(snap->name);
kfree(snap);
}
static const struct attribute_group *rbd_snap_attr_groups[] = {
&rbd_snap_attr_group,
NULL
};
static struct device_type rbd_snap_device_type = {
.groups = rbd_snap_attr_groups,
.release = rbd_snap_dev_release,
};
static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec)
{
kref_get(&spec->kref);
@ -3483,38 +3414,11 @@ static void rbd_dev_destroy(struct rbd_device *rbd_dev)
kfree(rbd_dev);
}
static bool rbd_snap_registered(struct rbd_snap *snap)
{
bool ret = snap->dev.type == &rbd_snap_device_type;
bool reg = device_is_registered(&snap->dev);
rbd_assert(!ret ^ reg);
return ret;
}
static void rbd_remove_snap_dev(struct rbd_snap *snap)
{
list_del(&snap->node);
if (device_is_registered(&snap->dev))
device_unregister(&snap->dev);
}
static int rbd_register_snap_dev(struct rbd_snap *snap,
struct device *parent)
{
struct device *dev = &snap->dev;
int ret;
dev->type = &rbd_snap_device_type;
dev->parent = parent;
dev->release = rbd_snap_dev_release;
dev_set_name(dev, "%s%s", RBD_SNAP_DEV_NAME_PREFIX, snap->name);
dout("%s: registering device for snapshot %s\n", __func__, snap->name);
ret = device_register(dev);
return ret;
kfree(snap->name);
kfree(snap);
}
static struct rbd_snap *__rbd_add_snap_dev(struct rbd_device *rbd_dev,
@ -4089,8 +3993,6 @@ static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev, u64 *hver)
dout("rbd_dev_snaps_update returned %d\n", ret);
if (ret)
goto out;
ret = rbd_dev_snaps_register(rbd_dev);
dout("rbd_dev_snaps_register returned %d\n", ret);
out:
up_write(&rbd_dev->header_rwsem);
@ -4145,11 +4047,11 @@ static int rbd_dev_snaps_update(struct rbd_device *rbd_dev)
*/
if (rbd_dev->spec->snap_id == snap->id)
clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags);
rbd_remove_snap_dev(snap);
dout("%ssnap id %llu has been removed\n",
dout("removing %ssnap id %llu\n",
rbd_dev->spec->snap_id == snap->id ?
"mapped " : "",
(unsigned long long) snap->id);
rbd_remove_snap_dev(snap);
/* Done with this list entry; advance */
@ -4209,31 +4111,6 @@ static int rbd_dev_snaps_update(struct rbd_device *rbd_dev)
return 0;
}
/*
* Scan the list of snapshots and register the devices for any that
* have not already been registered.
*/
static int rbd_dev_snaps_register(struct rbd_device *rbd_dev)
{
struct rbd_snap *snap;
int ret = 0;
dout("%s:\n", __func__);
if (WARN_ON(!device_is_registered(&rbd_dev->dev)))
return -EIO;
list_for_each_entry(snap, &rbd_dev->snaps, node) {
if (!rbd_snap_registered(snap)) {
ret = rbd_register_snap_dev(snap, &rbd_dev->dev);
if (ret < 0)
break;
}
}
dout("%s: returning %d\n", __func__, ret);
return ret;
}
static int rbd_bus_add_dev(struct rbd_device *rbd_dev)
{
struct device *dev;
@ -4840,12 +4717,6 @@ static int rbd_dev_probe_finish(struct rbd_device *rbd_dev)
rbd_dev->parent = parent;
}
down_write(&rbd_dev->header_rwsem);
ret = rbd_dev_snaps_register(rbd_dev);
up_write(&rbd_dev->header_rwsem);
if (ret)
goto err_out_bus;
ret = rbd_dev_header_watch_sync(rbd_dev, 1);
if (ret)
goto err_out_bus;