Driver Core: block: add nodename support for block drivers.

This adds support for block drivers to report their requested nodename
to userspace.  It also updates a number of block drivers to provide the
needed subdirectory and device name to be used for them.

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Jan Blunck <jblunck@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 18 insertions, 1 deletions

diff --git a/block/genhd.c b/block/genhd.c
index fe7ccc0a618f..f4c64c2b303a 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -996,10 +996,20 @@ struct class block_class = {
         .name           = "block",
 };
 
+static char *block_nodename(struct device *dev)
+{
+        struct gendisk *disk = dev_to_disk(dev);
+
+        if (disk->nodename)
+                return disk->nodename(disk);
+        return NULL;
+}
+
 static struct device_type disk_type = {
         .name           = "disk",
         .groups         = disk_attr_groups,
         .release        = disk_release,
+        .nodename       = block_nodename,
 };
 
 #ifdef CONFIG_PROC_FS
diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index d57f11759480..37e0f81cada2 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -2855,6 +2855,11 @@ static struct block_device_operations pktcdvd_ops = {
         .media_changed =        pkt_media_changed,
 };
 
+static char *pktcdvd_nodename(struct gendisk *gd)
+{
+        return kasprintf(GFP_KERNEL, "pktcdvd/%s", gd->disk_name);
+}
+
 /*
  * Set up mapping from pktcdvd device to CD-ROM device.
  */
@@ -2907,6 +2912,7 @@ static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev)
         disk->fops = &pktcdvd_ops;
         disk->flags = GENHD_FL_REMOVABLE;
         strcpy(disk->disk_name, pd->name);
+        disk->nodename = pktcdvd_nodename;
         disk->private_data = pd;
         disk->queue = blk_alloc_queue(GFP_KERNEL);
         if (!disk->queue)
@@ -3062,6 +3068,7 @@ static const struct file_operations pkt_ctl_fops = {
 static struct miscdevice pkt_misc = {
         .minor          = MISC_DYNAMIC_MINOR,
         .name           = DRIVER_NAME,
+        .name           = "pktcdvd/control",
         .fops           = &pkt_ctl_fops
 };
 
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 7cbd38d363a2..45fc320a53c6 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -142,7 +142,7 @@ struct gendisk {
                                          * disks that can't be partitioned. */
 
         char disk_name[DISK_NAME_LEN];  /* name of major driver */
-
+        char *(*nodename)(struct gendisk *gd);
         /* Array of pointers to partitions indexed by partno.
          * Protected with matching bdev lock but stat and other
          * non-critical accesses use RCU.  Always access through