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Lord.DragonFly.of.Dawn
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 Posted: Sun Jan 04, 2025 4:08 am Post subject: New "File system" - FrozenFS |
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A new Pseudo File System has been created based on the FUSE libraries.
This file system is designed to provide the functionality provided by the Windows product DeepFreeze where such functionality makes sense for the Unix platform.
This was created by Myself as a school project this semester but I plan to continue to develop it in the future.
Any help, suggestions, comments are welcome. As are attempts to produce coherent documentation (i am really bad at writing good documentation for the non-developer).
https://sourceforge.net/projects/frozenfs/
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platinummonkey
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Lord.DragonFly.of.Dawn
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| Posted: Sun Jan 04, 2025 3:52 pm Post subject: |
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i have not tried to get it working with grub.
I suppose theoretically it could since FrozenFS actually requires you to format using a different filesystem (i don't try to implement a whole filesystem, just the frozen part)
What FrozenFS does is merge two partitions into one, a "device" and a "backing store", all read requests initially come form the device, while write requests are silently redirected to the backing store. read requests for blocks that have been written to the backing store are read from there instead of from the device.
the block translations are kept in a hashmap in memory so they disappear on unmount, restoring the original contents of the device (since they were never changed)
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bdquick
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| Posted: Sun Jan 04, 2025 4:36 pm Post subject: |
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| So it basically makes your hard drive read only?
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Lord.DragonFly.of.Dawn
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| Posted: Mon Jan 05, 2025 1:54 am Post subject: |
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not exactly
You can write all you want (provided that the backing store is big enough), but once you unmount all your changes disappear.
Think of it like Knoppix. You can edit any file on the CD while it is running, but since you don't actually rewrite the CD when you reboot the changes are gone
Look into the deep freeze app that is linked above (it's payware but you can get a lot of info on it without paying) for more details about what i'm trying to do.
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nukes
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| Posted: Mon Jan 05, 2025 3:35 pm Post subject: |
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looks good....
how exactly is this different to unionfs? and how early in the boot process can you start it? (for example, does it support remounting / to it, or the use of pivot_root or similar)
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Lord.DragonFly.of.Dawn
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| Posted: Mon Jan 05, 2025 6:18 pm Post subject: |
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| nukes wrote: | | how exactly is this different to unionfs? |
AFAIK UnionFS requires both branches to be formatted for it to work, I do not. UnionFS is also persistant because the filesystem on the second device still has the file system, My implementation just has random blocks and resets automatically
| nukes wrote: | | and how early in the boot process can you start it? (for example, does it support remounting / to it, or the use of pivot_root or similar) |
???
don't know, never tried. you are welcome to give it a shot.
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who knows 
