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Subject[BUG] 2.6.8-rc3 jffs2 unable to read filesystems
The following two messages sum up the problem:

JFFS2 compression type 0x5a06 not avaiable.
Error: jffs2_decompress returned -5

It appears that a jffs2 change committed on July 15th has caused recent
2.6.8-rc kernels to be incompatible with jffs2 filesystems modified by
previous kernel versions.

The "new format" jffs2 filesystem uses both "compr" and "usercompr"
of the jffs2_raw_inode structure, whereas previous implementations
left "usercompr" uninitialised and thus contains random data.

This can be seen by tracing through the code from jffs2_alloc_raw_inode()
and noticing that previous implementations do not initialise this field -
AFAICS kmem_cache_alloc() does not guarantee that memory returned by
this function will be initialised.

Therefore, recent 2.6.8-rc kernels must _NOT_ use this field if they
wish to remain compatible with existing jffs2 filesystems.

--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of: 2.6 PCMCIA - http://pcmcia.arm.linux.org.uk/
2.6 Serial core
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