rbd: add 'config_info' sysfs rbd device attribute
Export the info used to setup the rbd image, so it can be used to remap
the image.
Signed-off-by: Mike Christie <mchristi@redhat.com>
[idryomov@gmail.com: do_rbd_add() EH]
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 36ebec1..8ff2dc8 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -370,6 +370,7 @@
unsigned long flags; /* possibly lock protected */
struct rbd_spec *spec;
struct rbd_options *opts;
+ char *config_info; /* add{,_single_major} string */
struct ceph_object_id header_oid;
struct ceph_object_locator header_oloc;
@@ -4620,6 +4621,14 @@
return sprintf(buf, "%pU\n", &rbd_dev->rbd_client->client->fsid);
}
+static ssize_t rbd_config_info_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
+
+ return sprintf(buf, "%s\n", rbd_dev->config_info);
+}
+
static ssize_t rbd_pool_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -4732,6 +4741,7 @@
static DEVICE_ATTR(client_addr, S_IRUGO, rbd_client_addr_show, NULL);
static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL);
static DEVICE_ATTR(cluster_fsid, S_IRUGO, rbd_cluster_fsid_show, NULL);
+static DEVICE_ATTR(config_info, S_IRUSR, rbd_config_info_show, NULL);
static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL);
static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL);
static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL);
@@ -4749,6 +4759,7 @@
&dev_attr_client_addr.attr,
&dev_attr_client_id.attr,
&dev_attr_cluster_fsid.attr,
+ &dev_attr_config_info.attr,
&dev_attr_pool.attr,
&dev_attr_pool_id.attr,
&dev_attr_name.attr,
@@ -4824,6 +4835,7 @@
ceph_oid_destroy(&rbd_dev->header_oid);
ceph_oloc_destroy(&rbd_dev->header_oloc);
+ kfree(rbd_dev->config_info);
rbd_put_client(rbd_dev->rbd_client);
rbd_spec_put(rbd_dev->spec);
@@ -6223,10 +6235,18 @@
spec = NULL; /* rbd_dev now owns this */
rbd_opts = NULL; /* rbd_dev now owns this */
+ rbd_dev->config_info = kstrdup(buf, GFP_KERNEL);
+ if (!rbd_dev->config_info) {
+ rc = -ENOMEM;
+ goto err_out_rbd_dev;
+ }
+
down_write(&rbd_dev->header_rwsem);
rc = rbd_dev_image_probe(rbd_dev, 0);
- if (rc < 0)
+ if (rc < 0) {
+ up_write(&rbd_dev->header_rwsem);
goto err_out_rbd_dev;
+ }
/* If we are mapping a snapshot it must be marked read-only */
@@ -6253,7 +6273,6 @@
return rc;
err_out_rbd_dev:
- up_write(&rbd_dev->header_rwsem);
rbd_dev_destroy(rbd_dev);
err_out_client:
rbd_put_client(rbdc);