diff options
| author | Mike Christie <mchristi@redhat.com> | 2016-08-18 18:38:44 +0200 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2016-08-24 23:49:17 +0200 |
| commit | 92a58671549f365a962517cc7cccb624dea8581e (patch) | |
| tree | 12dc735f12c6e253209d0b69d6a78ea2b743f391 | |
| parent | 267fb90b8344eeb6f835734e356b422f78617088 (diff) | |
rbd: add 'snap_id' sysfs rbd device attribute
Export snap id in sysfs, so tools like multipathd can use it in a uuid.
Signed-off-by: Mike Christie <mchristi@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-rbd | 4 | ||||
| -rw-r--r-- | drivers/block/rbd.c | 10 |
2 files changed, 14 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-rbd b/Documentation/ABI/testing/sysfs-bus-rbd index 9a655f3f4386..7bf8d4fa6f63 100644 --- a/Documentation/ABI/testing/sysfs-bus-rbd +++ b/Documentation/ABI/testing/sysfs-bus-rbd @@ -102,6 +102,10 @@ current_snap The current snapshot for which the device is mapped. +snap_id + + The current snapshot's id. (August 2016, since 4.9.) + parent Information identifying the chain of parent images in a layered rbd diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index c95104a80065..36ebec19dc20 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -4669,6 +4669,14 @@ static ssize_t rbd_snap_show(struct device *dev, return sprintf(buf, "%s\n", rbd_dev->spec->snap_name); } +static ssize_t rbd_snap_id_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); + + return sprintf(buf, "%llu\n", rbd_dev->spec->snap_id); +} + /* * For a v2 image, shows the chain of parent images, separated by empty * lines. For v1 images or if there is no parent, shows "(no parent @@ -4730,6 +4738,7 @@ static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); static DEVICE_ATTR(image_id, S_IRUGO, rbd_image_id_show, NULL); static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); +static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL); static DEVICE_ATTR(parent, S_IRUGO, rbd_parent_show, NULL); static struct attribute *rbd_attrs[] = { @@ -4745,6 +4754,7 @@ static struct attribute *rbd_attrs[] = { &dev_attr_name.attr, &dev_attr_image_id.attr, &dev_attr_current_snap.attr, + &dev_attr_snap_id.attr, &dev_attr_parent.attr, &dev_attr_refresh.attr, NULL |