From 92650778d437fb309b170c175f0c83099555dde2 Mon Sep 17 00:00:00 2001
From: Paul Clements <paul.clements@steeleye.com>
Date: Wed, 6 Dec 2006 20:40:53 -0800
Subject: [PATCH] --- yaml --- r: 42966 b: refs/heads/master c:
 6b39bb6548d60b9a18826134b5ccd5c3cef85fe2 h: refs/heads/master v: v3

---
 [refs]                    |  2 +-
 trunk/drivers/block/nbd.c | 16 ++++++++++++++++
 trunk/include/linux/nbd.h |  1 +
 3 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index 819111cef5a5..d78d51dcff9f 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 792908225064b1d841a8990b9d1d1cfc4e0e5bb2
+refs/heads/master: 6b39bb6548d60b9a18826134b5ccd5c3cef85fe2
diff --git a/trunk/drivers/block/nbd.c b/trunk/drivers/block/nbd.c
index 9d1035e8d9d8..7bf2cfbd6285 100644
--- a/trunk/drivers/block/nbd.c
+++ b/trunk/drivers/block/nbd.c
@@ -355,14 +355,30 @@ static struct request *nbd_read_stat(struct nbd_device *lo)
 	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;
 }
 
diff --git a/trunk/include/linux/nbd.h b/trunk/include/linux/nbd.h
index d6b6dc09ad97..0f3e69302540 100644
--- a/trunk/include/linux/nbd.h
+++ b/trunk/include/linux/nbd.h
@@ -64,6 +64,7 @@ struct nbd_device {
 	struct gendisk *disk;
 	int blksize;
 	u64 bytesize;
+	pid_t pid; /* pid of nbd-client, if attached */
 };
 
 #endif