Messages in this thread |  | | | Date | Thu, 03 Mar 2011 13:29:53 -0500 | | From | Mark Lord <> | | Subject | Re: [PATCH] Syscalls: reboot: Add options to the reboot syscall to remount filesystems ro |
| |
On 11-03-03 01:17 PM, Linus Torvalds wrote: > On Thu, Mar 3, 2011 at 9:45 AM, Linus Torvalds > <torvalds@linux-foundation.org> 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
|  |