Messages in this thread | | | From | David Woodhouse <> | Subject | Re: jffs on non-MTD device? | Date | Fri, 25 May 2001 09:44:10 +0100 |
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pavel@suse.cz said: > I'm trying to run jffs on my ATA-flash disk (running ext2 could kill > some flash cells too soon, right?) but it refuses:
CompactFlash does wear levelling internally.
> if (MAJOR(dev) != MTD_BLOCK_MAJOR) { > printk(KERN_WARNING "JFFS: Trying to mount a " > "non-mtd device.\n"); > return 0; > }
> What are reasons for this check?
JFFS doesn't actually use the block device interface. Specifying it in the mount command is simply a hack to make life easier, which nobody's yet managed to obsolete. We actually use the underlying MTD device:
mtd = get_mtd_device(NULL, MINOR(dev));
If you want JFFS (or JFFS2) on a CF device - in the apparent absence of any other relatively low overhead, compressing, journalling file system to use on it - then you need to provide a translation driver similar to the mtdram one which fakes an MTD device, using a block device as backing store.
-- dwmw2
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