Add Task 20 description
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Task20/task20.txt
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This is Task 20 of the Eudyptula Challenge
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Networking filters turned out to be not all that complex in the end,
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great work with that.
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So, here's the final task.
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There might be other tasks that get created and sent out later on, but
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the original challenge had 20 tasks, so after finishing this one, you
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can consider yourself done!
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Let's try something a bit harder. Something that might cause some data
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loss on a filesystem, always a fun thing to play with, if for no other
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reason than to not be afraid of things like that in the future.
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This task requires you to work on the fat filesystem code:
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- Add an ioctl to modify the volume label of a mounted fat filesystem.
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Be sure to handle both 16 and 32 bit fat filesystems {hint!}
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- Provide a userspace .c program to test this new ioctl.
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That's it! Seems so simple, right? I wonder why that option isn't in
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the kernel tree already...
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Anyway, provide a patch to the kernel, and the .c file used to test the
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new ioctl, as well as "proof" of this working. Make sure you don't run
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into 32/64bit kernel issues with the ioctl, if you do things correctly,
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you shouldn't have any problems.
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I recommend doing this work on either a loop-back fat filesystem on your
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"normal" filesystem, or on a USB stick. Either will work just as well,
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and make things easier to debug and test.
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Watch out for locking issues, as well as dirty filesystem state
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problems.
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Best of luck!
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