[PATCH] nbd: show nbd client pid in sysfs

[Paul Clements <paul.clements@steeleye.com>]

This simple patch allows nbd to expose the nbd-client daemon's PID in 
/sys/block/nbd<x>/pid. This is helpful for tracking connection status of 
a device and for determining which nbd devices are currently in use.

Tested against 2.6.19.

Thanks,
Paul

--- ./drivers/block/nbd.c	Wed Nov 29 16:57:37 2006
+++ ./drivers/block/nbd.c	Tue Nov 28 16:09:31 2006
@@ -355,14 +389,30 @@ 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;
 }
 
--- ./include/linux/nbd.h	Wed Nov 29 16:57:37 2006
+++ ./include/linux/nbd.h	Mon Dec  4 23:28:30 2006
@@ -64,6 +64,7 @@ struct nbd_device {
 	struct gendisk *disk;
 	int blksize;
 	u64 bytesize;
+	pid_t pid; /* pid of nbd-client, if attached */
 };
 
 #endif