Messages in this thread | | | From | David Woodhouse <> | Subject | Re: ramdisk/tmpfs/ramfs/memfs ? | Date | Fri, 27 Apr 2001 16:56:35 +0100 |
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padraig@antefacto.com said: > btw I get my initial root filesystem from a compact flash that can be > accessed just like a hardisk. It's writeable also like a harddisk, but > we boot with it readonly, and only mount it rw if we want to save > config or whatever. We definitely wouldn't swap to it as it has > limited erase/write cycles. The filesystem is compressed ext2.
Why copy it into RAM? Why not use cramfs and either turn the writable directories into symlinks into a ramfs which you create at boot time, or union-mount a ramfs over the top of it?
padraig@antefacto.com said: > As for using JFFS2 + MTD ramdisk intead of ext2+e2compr+ramdisk is not > an option as the only advantage would be journalling, you still can't > resize. IMHO JFFS is only required where you have flash without an IDE > interface.
True. We are currently lacking a compact, compressing, journalling filesystem for use on block devices. It's been suggested that we could make JFFS2 work on them, by making a fake MTD device which uses a block device as backing store. Nobody's yet shown me the code though :)
-- dwmw2
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