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e2compress

e2compress will require a lot of work. It's not available under e2compr-0.4 at all yet.

Hopefully I will do these changes myself. e2compress is a big program.

• Put the verification and correction code into a library, so that it can be shared by e2fsck.
• Make e2compress refuse to work (or call the kernel code) for files that are open by other processes. (Of particular importance is preventing writes from other processes from being lost.) One way of doing this --the way that the code in progress has been using-- is to use the EXT2_NOCOMPR_FL bit, which can only be raised if no other processes have the file open, and which, while raised, prevents other processes from opening it. Another way is to use mandatory file locking (flock() etc.).
• Have e2compress able to compress or decompress "in place", thus reducing problems of multiple links and processes wishing to write to the file.
• Better safety checks. Don't just decompress in memory, but read the file as written (thus catching some I/O errors) and warn if the uncompressed data could pass for data of a compressed cluster.

This work was in progress, but, for the 0.3.5 release, I decided just to fix one or two problems in an earlier version of e2compress rather than wait until the more featureful e2compress was ready.

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