possible to mask nodes from being created ?

possible to mask nodes from being created ?

[Mike Frysinger]

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i looked through the files in /etc/udev/ but wasnt able to figure out a way to 
keep udev from creating nodes i'll never use ...

for example, /dev/vc/ is populated with 64 nodes for the console and /dev/rd/ 
is populated with 16 nodes for ramdisks ... personally i know i'm never going 
to use 64 nodes for my console nor am i going to use 16 nodes for 
ramdisks ...

is there anyway for me to say 'only create tty[0-5]' or 'only create 
ram[0-3]' ?  note that even throwing them in subdirs and just not creating a 
symlink isnt good enough in my book ;)
-mike

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Re: possible to mask nodes from being created ?

[Greg KH]

On Thu, Feb 19, 2004 at 02:52:08PM -0500, Mike Frysinger wrote:
> i looked through the files in /etc/udev/ but wasnt able to figure out a way to 
> keep udev from creating nodes i'll never use ...
> 
> for example, /dev/vc/ is populated with 64 nodes for the console and /dev/rd/ 
> is populated with 16 nodes for ramdisks ... personally i know i'm never going 
> to use 64 nodes for my console nor am i going to use 16 nodes for 
> ramdisks ...
> 
> is there anyway for me to say 'only create tty[0-5]' or 'only create 
> ram[0-3]' ?  note that even throwing them in subdirs and just not creating a 
> symlink isnt good enough in my book ;)

Yes there is.  Just make a rule that matches the devices that you do not
want to have created and do not specify a NAME field (or give it a empty
string.)  Something like:
	KERNEL="tty[6-9]", NAME=""
or just
	KERNEL="tty[6-9]"

Hope this helps.

greg k-h


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Re: possible to mask nodes from being created ?

[Jon Smirl]

I just changed to kernel includes to make fewer devices....

include/linux/tty.h:    1.23 1.24 jonsmirl 04/02/07 14:34:12 (modified, needs
delta)

@@ -10,8 +10,8 @@
  * resizing).
  */
 #define MIN_NR_CONSOLES 1       /* must be at least 1 */
-#define MAX_NR_CONSOLES	63	/* serial lines start at 64 */
-#define MAX_NR_USER_CONSOLES 63	/* must be root to allocate above this */
+#define MAX_NR_CONSOLES	15	/* serial lines start at 64 */
+#define MAX_NR_USER_CONSOLES 15	/* must be root to allocate above this */
 		/* Note: the ioctl VT_GETSTATE does not work for
 		   consoles 16 and higher (since it returns a short) */
 

--- Greg KH <greg@kroah.com> wrote:
> On Thu, Feb 19, 2004 at 02:52:08PM -0500, Mike Frysinger wrote:
> > i looked through the files in /etc/udev/ but wasnt able to figure out a way
> to 
> > keep udev from creating nodes i'll never use ...
> > 
> > for example, /dev/vc/ is populated with 64 nodes for the console and
> /dev/rd/ 
> > is populated with 16 nodes for ramdisks ... personally i know i'm never
> going 
> > to use 64 nodes for my console nor am i going to use 16 nodes for 
> > ramdisks ...
> > 
> > is there anyway for me to say 'only create tty[0-5]' or 'only create 
> > ram[0-3]' ?  note that even throwing them in subdirs and just not creating a
> 
> > symlink isnt good enough in my book ;)
> 
> Yes there is.  Just make a rule that matches the devices that you do not
> want to have created and do not specify a NAME field (or give it a empty
> string.)  Something like:
> 	KERNEL="tty[6-9]", NAME=""
> or just
> 	KERNEL="tty[6-9]"
> 
> Hope this helps.
> 
> greg k-h
> 
> 
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==Jon Smirl
jonsmirl@yahoo.com

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Re: possible to mask nodes from being created ?

[Mike Frysinger]

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On Friday 20 February 2004 07:53 pm, Jon Smirl wrote:
> I just changed to kernel includes to make fewer devices....

> > Yes there is.  Just make a rule that matches the devices that you do not
> > want to have created and do not specify a NAME field (or give it a empty
> > string.)

ah both will work just fine, thanks guys
-mike

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