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If you get one of these two error messages from the kernel:
EXT2-fs: <device>: couldn't mount because of unsupported optional features.
EXT2-fs: <device>: couldn't mount because of unsupported compression
algorithms <algorithm>...
then probably your kernel does not have support for e2compr, or was not
compiled with support for the listed compression algorithms.
Two options:
-
Use a kernel that does support them. If the kernel that doesn't support
e2compr is for a rescue disk, remember that you can use your normal hard
disk kernel but pass the kernel a `root=/dev/fd0' (or whatever)
option.
-
Pass the kernel the `force-compat' mount option. At the time of
writing, the `force-compat' mount option is accepted only by
e2compr kernels, so this probably won't help with the first of these
problems.
If you later get `I/O error' messages from some programs, it
probably means that they tried to read part of a file that was
compressed with an algorithm not supported by the current kernel. (See
the kernel log to confirm whether this is the case or whether it's a
physical I/O error.)
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