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rbd: add 'snap_id' sysfs rbd device attribute

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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>
This commit is contained in:
Mike Christie 2016-08-18 18:38:44 +02:00 committed by Ilya Dryomov
parent 267fb90b83
commit 92a5867154
2 changed files with 14 additions and 0 deletions
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4
Documentation/ABI/testing/sysfs-bus-rbd
View File

@ -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

10
drivers/block/rbd.c
View File

@ -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