Patch: 2.5.62.4 small devfs

Patch: 2.5.62.4 small devfs

[Adam J. Richter]

On Fri, 28 Feb 2003, Andrew Walrond wrote:
>[...] I want to give this another whirl, but your latest 
>patch doesn't apply cleanly against 2.5.63+ (fs/devfs/base.c fails). Any 
>chance of an update?

	I have made a new version of my small devfs patch against
linux-2.5.62.bk4.  This version fixes a bug where directory->i_sem was
held while devfs_helper ran, which caused deadlock on one system.  I
am surprised I had not noticed this problem before.  This version also
adds Documentation/filesystems/devfs/small-devfs, describing
differences between the old devfs implementation and this one. You can
retrieve the patch from the following URL.

ftp://ftp.yggdrasil.com/pub/dist/device_control/devfs/smalldevfs-2.5.62.4-v11.patch

	As before, the optional devfs_helper user level program can
be retrived from:

ftp://ftp.yggdrasil.com/pub/dist/device_control/devfs/devfs_helper-0.2.tar.gz


	My "to do" list for small devfs is now as follows.

		- Submit a patch to the -mm kernels, as Andrew has been
		  kind enough to distribute this change in his -mm kernels.
		- Remove CONFIG_DEVFS_MOUNT?
		- Explore eliminating by fs/devfs/fs.c by extending
		  dnotify and ramfs slightly.
		- Probably request integration after linux-2.7.0.

Adam J. Richter     __     ______________   575 Oroville Road
adam@yggdrasil.com     \ /                  Milpitas, California 95035
+1 408 309-6081         | g g d r a s i l   United States of America
                         "Free Software For The Rest Of Us."

Re: Patch: 2.5.62.4 small devfs

[Andrew Walrond]

Hi Adam

Could you suggest a simple bit of sh script that will tell me if I have 
a devfs or small devfs kernel, (so my init scripts can decide whether or 
not to load devfsd?)

Andrew Walrond

Re: Patch: 2.5.62.4 small devfs

[Andrew Walrond]

Hmmm

I'm already using the existance of .devfsd to see if devfs was mounted 
by the kernel at boot. This suggests I need a new test for small devfs?

Andrew

jordan.breeding@attbi.com wrote:
> if [ -f /dev/.devfsd ]; then
>   you know you have old devfs
> fi
> 
> Jordan (I am fairly certain that it is /dev/.devfsd, you can always do ls -
> al /dev/.* to find the real name)
> 
>>Hi Adam
>>
>>Could you suggest a simple bit of sh script that will tell me if I have 
>>a devfs or small devfs kernel, (so my init scripts can decide whether or 
>>not to load devfsd?)
>>
>>Andrew Walrond
>>
>>
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> 

Re: Patch: 2.5.62.4 small devfs

[Adam J. Richter]

>Could you suggest a simple bit of sh script that will tell me if I have 
>a devfs or small devfs kernel, (so my init scripts can decide whether or 
>not to load devfsd?)

	I haven't tested this, but something like this might
work:

	if [ -e /dev/.devfsd ] ; then
		echo "Running old devfs"
		devfsd
	else
		echo "Running no devfs or new devfs."
	fi

Adam J. Richter     __     ______________   575 Oroville Road
adam@yggdrasil.com     \ /                  Milpitas, California 95035
+1 408 309-6081         | g g d r a s i l   United States of America
                         "Free Software For The Rest Of Us."