Re: [autofs4 patch] Use /proc/mounts instead of /etc/mtab

[Ian Kent <raven@themaw.net>]

On Wed, 2006-11-08 at 22:25 -0500, Jeff Moyer wrote:
> ==> On Thu, 09 Nov 2006 11:17:09 +0800, Ian Kent <raven@themaw.net> said:
> 
> Ian> On Wed, 2006-11-08 at 22:03 -0500, Jeff Moyer wrote: > Hi, Ian,
> Ian> list,
> Ian> > 
> Ian> > Here is a patch to consult /proc/mounts instead of /etc/mtab
> Ian> when > deciding if a path has already been mounted.  The problem
> Ian> with using > /etc/mtab, as you know, is that it sometimes does
> Ian> not get updated.  We > know that /proc/mounts will always be
> Ian> right, so why not use it?
> 
> Ian> Good for v4 but keep in mind that in v5 /proc/mounts can have a
> Ian> lot of entries compared to /etc/mtab. The cost of doing this can
> Ian> be quite high.  mount(8) must play well with mtab for v5.
> 
> It's not just mount(8), but also the caller's responsibility.  You
> have to be sure to check for the mtab not updated return value, and
> issue another mount call to try to update it.

Ya .. been there before.
I'll need to check that.

Ian