--- Seth Arnold <sarnold@wirex.com> wrote: > On Tue, Jun 10, 2003 at 08:01:17PM -0700, Anthony > Nicholson wrote: > > I want to be able to turn the swap on and off from > within > > a kernel module I've written. > > I won't go into this. Suffice to say I think this is > probably a pretty > horrible idea. It's not a horrible idea. my module is implementing encrypted swap space. when the module is installed, everything in the swapfile will be encrypted (decrypted as it is paged out). when it's not installed, everything in the swapfile will be handled as normal (unencrypted). so you can see why, when I'm rmmoding this module, I need to essentially do this: swapoff rmmod <module> swapon so that there isn't any encrypted stuff left in the swapfile when my module is gone. i wanted to do it directly in the exit function rather than having to type swapon/swapoff at the command line (since users won't remember to do that when removing the module, and bad things happen). > Chances are good you can "unravel" the sys_swapoff() > function, and do > what it does. You may have to unravel several layers of > functions before > you're done. But it can probably be done. of course that can be done. it's just very very ugly. swapon calls tons of other functions, all of whom I would have to EXPORT_SYMBOL if I wanted to access them from my module version of sys_swapon(). __________________________________ Do you Yahoo!? Yahoo! Calendar - Free online calendar with sync to Outlook(TM). http://calendar.yahoo.com -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
