NAND Full Requirement
pgf at laptop.org
pgf at laptop.org
Tue Jul 22 16:22:33 EDT 2008
> On Tue, Jul 22, 2008 at 04:01:35PM -0400, Greg Smith wrote:
> > Hi All,
> > Here's the requirement for Uruguay NAND full situation.
> > I need this fixed ASAP.
> > - The XO must always boot up to sugar including allowing access to the
> > journal. That is no matter the fullness of the NAND
> > - If the NAND has less than nnMB (50?) free, warn the user that they are
> > low on space.
> > - Must be installable on 656 in the Uruguay configuration
> > - Must not delete any user created files
> > - Must not disable any activities or other functionality
> > So far they have:
> > - a dialog box which warns when you get low on space
> > - Chris's script which allows deleting stuff automaticaly but probably
> > user stuff
> > What else they want, not sure... I will talk to Emliano ASAP and let you
> > know.
> > Erik will propose one solution (related to RamFS I believe).
> See: http://dev.laptop.org/ticket/7587#comment:4
> On boot, check NAND discomfort level. If high, use unionfs(4) to mount
> a read/write tmpfs over top of a read-only jffs2 rootfs. Set unionfs
> flags to enable file deletion from the 'ro' root partition (or if this
> is impossible, mount the fs in another location to allow deletions).
> Set a flag to tell olpc-session or Sugar to enter into a deletion
> This solution theoretically allows all software to run an a NAND-full
> machine. Thus students who arrive at school with a NAND-full machine
> could still work with their XO through lessons and manage flash cleanup
> as time is available. Requires minimal code-level changes to enable.
what happens when they fill up tmpfs while still working through
the idea is intriguing, but it would have to be a limited mode
of operation: i.e., no activity startup, please reboot soon.
> Working on this solution may distract from efforts to get our system to
> boot cleanly on top of a read-only root fs. C. Scott and others have
> suggested that we ultimately want to do this.
> Currently unionfs is untested on the XO. I am waiting for a
> unionfs-enabled kernel (currently building). Theoretically it will
> work, as per every Linux livecd under the sun.
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paul fox, pgf at laptop.org
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