why can't i see *all* mounts with "mount"?

[Mikkel L. Ellertson]

Robert P. J. Day wrote:
>   i'm curious as to why the "mount" command won't show me all the
> mounts that i can view via /proc/mounts.  for example, "mount" doesn't
> show me the usbfs mount, or the selinuxfs mount, or ... well, you get
> the idea.
> 
>   were these mount types left out of the output of mount for a reason?
> just curious.
> 
> rday
> 
Mount uses /etc/mtab - it is possible to mount file systems without 
writing to mtab. Also, the file systems mounted before the root file 
system is remounted r/w will not get written. On the other hand, 
/proc/mounts shows all the mounts the kernel knows about.

I suspect the reason that mount does not use /proc/mounts is for a 
couple of reasons. First of all, when it was written, there was not 
a /proc file system. I believe you can also run a Linux system 
without a /proc file system.

Mikkel
-- 

   Do not meddle in the affairs of dragons,
for thou art crunchy and taste good with Ketchup!

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