JFFS2 node type headers.

[David Woodhouse <dwmw2@xxxxxxx.org>]

We've found a problem with the compatibility node type stuff in JFFS2. 
It's actually quite easy to end up with the sequence 0x1984 0xCxxx on the 
flash, where the 'xxx' part has a bit flipped from the original, and 
the 'C' means it's a JFFS2_FEATURE_INCOMPAT node - and the filesystem 
therefore refuses to mount it because it doesn't recognise the exact 
nodetype.

The solution to this is probably to add a CRC to the uniform node header.

So... do I just do it and break the existing JFFS2 filesystems, or do I 
write all the compatibility code to deal with older filesystems? 

JFFS3, anyone?

-- 
dwmw2



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