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    SubjectRe: [PATCH] Syscalls: reboot: Add options to the reboot syscall to remount filesystems ro
    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.


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