Re: [PATCH] Syscalls: reboot: Add options to the reboot syscall toremount filesystems ro

[Mark Lord]

On 11-03-03 01:17 PM, Linus Torvalds wrote:
> On Thu, Mar 3, 2011 at 9:45 AM, Linus Torvalds
> <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
>>
>> How many mounted filesystems do you have that it's so hard to keep track of?
> 
> Btw, /proc/mounts will track them for you even if you don't have a
> 'mount' binary that does.
> 
> Parsing that is pretty trivial. If you have spaces or special
> characters in your pathnames (you may control the mount paths, you may
> not - I have no idea), you'll need to be able to handle the escape
> format (\oct). But other than that, it's literally just
> 
>  - read all of /proc/mounts into a buffer
> 
>  - for each line, split by space, and you'll have the directory name
> right there in the second field
> 
>  - do the unescaping ("\oct" -> character) if needed. It's good
> practice. Test it.
> 
>  - just do a read-only remount on it.
> 
> All done. No kernel changes necessary. It just works.


This might be much less complex:

   #!/bin/sh
   echo s > /proc/sysrq-trigger
   echo u > /proc/sysrq-trigger

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