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    SubjectRe: [PATCH] Syscalls: reboot: Add options to the reboot syscall to remount filesystems ro
    On Thu, Mar 03, 2011 at 10:17:32AM -0800, Linus Torvalds wrote:
    > On Thu, Mar 3, 2011 at 9:45 AM, Linus Torvalds
    > <> 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.

    That or using setmntent() etc.


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