device_mapper: add new _dm_task_create_device_status

Introduce new function _dm_task_create_device_status for grabbing
status of device for better code sharing.

diff --git a/device_mapper/libdm-deptree.c b/device_mapper/libdm-deptree.c
index 5327b2e049e251475c6f551ed7fa4588beb47cca..bb552b679500c052a575ceaa56dc1584af965fd3 100644 (file)
--- a/device_mapper/libdm-deptree.c
+++ b/device_mapper/libdm-deptree.c
@@ -1382,20 +1382,14 @@ out:
        return r;
 }
 
-static int _thin_pool_get_status(struct dm_tree_node *dnode,
-                                struct dm_status_thin_pool *s)
+static struct dm_task *_dm_task_create_device_status(uint32_t major, uint32_t minor)
 {
        struct dm_task *dmt;
-       int r = 0;
-       uint64_t start, length;
-       char *type = NULL;
-       char *params = NULL;
 
        if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
-               return_0;
+               return_NULL;
 
-       if (!dm_task_set_major(dmt, dnode->info.major) ||
-           !dm_task_set_minor(dmt, dnode->info.minor)) {
+       if (!dm_task_set_major(dmt, major) || !dm_task_set_minor(dmt, minor)) {
                log_error("Failed to set major minor.");
                goto out;
        }
@@ -1406,6 +1400,26 @@ static int _thin_pool_get_status(struct dm_tree_node *dnode,
        if (!dm_task_run(dmt))
                goto_out;
 
+       return dmt;
+out:
+       dm_task_destroy(dmt);
+
+       return NULL;
+}
+
+static int _thin_pool_get_status(struct dm_tree_node *dnode,
+                                struct dm_status_thin_pool *s)
+{
+       struct dm_task *dmt;
+       int r = 0;
+       uint64_t start, length;
+       char *type = NULL;
+       char *params = NULL;
+
+       if (!(dmt = _dm_task_create_device_status(dnode->info.major,
+                                                 dnode->info.minor)))
+               return_0;
+
        dm_get_next_target(dmt, NULL, &start, &length, &type, &params);
 
        if (!type || (strcmp(type, "thin-pool") != 0)) {