linux-kernel - [PATCH] cuse: creat 'dead' device node for on-demand module loading

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Date:	Mon,  9 Sep 2013 20:11:38 +0200
From:	Tom Gundersen <teg@...m.no>
To:	fuse-devel@...ts.sourceforge.net
Cc:	linux-kernel@...r.kernel.org, Tom Gundersen <teg@...m.no>,
	Kay Sievers <kay@...y.org>, Miklos Szeredi <miklos@...redi.hu>
Subject: [PATCH] cuse: creat 'dead' device node for on-demand module loading

This allows udev (or more recently systemd-tmpfiles) to create /dev/cuse on
boot, in the same way as /dev/fuse is currently created, and the corresponding
module to be loaded on first access.

The corresponding functionalty was introduced for fuse in commit 578454f.

Signed-off-by: Tom Gundersen <teg@...m.no>
Cc: Kay Sievers <kay@...y.org>
Cc: Miklos Szeredi <miklos@...redi.hu>
---
 fs/fuse/cuse.c             | 5 ++++-
 include/linux/miscdevice.h | 1 +
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/fuse/cuse.c b/fs/fuse/cuse.c
index adbfd66..24da581 100644
--- a/fs/fuse/cuse.c
+++ b/fs/fuse/cuse.c
@@ -589,11 +589,14 @@ static struct attribute *cuse_class_dev_attrs[] = {
 ATTRIBUTE_GROUPS(cuse_class_dev);
 
 static struct miscdevice cuse_miscdev = {
-	.minor		= MISC_DYNAMIC_MINOR,
+	.minor		= CUSE_MINOR,
 	.name		= "cuse",
 	.fops		= &cuse_channel_fops,
 };
 
+MODULE_ALIAS_MISCDEV(CUSE_MINOR);
+MODULE_ALIAS("devname:cuse");
+
 static int __init cuse_init(void)
 {
 	int i, rc;
diff --git a/include/linux/miscdevice.h b/include/linux/miscdevice.h
index cb35835..65c8619 100644
--- a/include/linux/miscdevice.h
+++ b/include/linux/miscdevice.h
@@ -39,6 +39,7 @@
 #define MISC_MCELOG_MINOR	227
 #define HPET_MINOR		228
 #define FUSE_MINOR		229
+#define CUSE_MINOR		230
 #define KVM_MINOR		232
 #define BTRFS_MINOR		234
 #define AUTOFS_MINOR		235
-- 
1.8.4

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