[PATCH] nbd: show nbd client pid in sysfs
[sfrench/cifs-2.6.git] / drivers / block / nbd.c
index 9d1035e8d9d8c713148aa589abbf2c738022c197..7bf2cfbd6285254009febcf809d4926846ec42e6 100644 (file)
@@ -355,14 +355,30 @@ harderror:
        return NULL;
 }
 
+static ssize_t pid_show(struct gendisk *disk, char *page)
+{
+       return sprintf(page, "%ld\n",
+               (long) ((struct nbd_device *)disk->private_data)->pid);
+}
+
+static struct disk_attribute pid_attr = {
+       .attr = { .name = "pid", .mode = S_IRUGO },
+       .show = pid_show,
+};
+
 static void nbd_do_it(struct nbd_device *lo)
 {
        struct request *req;
 
        BUG_ON(lo->magic != LO_MAGIC);
 
+       lo->pid = current->pid;
+       sysfs_create_file(&lo->disk->kobj, &pid_attr.attr);
+
        while ((req = nbd_read_stat(lo)) != NULL)
                nbd_end_request(req);
+
+       sysfs_remove_file(&lo->disk->kobj, &pid_attr.attr);
        return;
 }