e2compress bugs and limitations

This program still isn't finished -- but it's now ready enough that the author uses it to compress directory trees (`find DIRS -type f -links 1 -print0|xargs -0 nice e2compress -mgzip9 -b32').

The precise behaviour of this program in certain circumstances has changed. This will continue to occur until it is considered "finished".

Any writes to the file while e2compress is in action (that is to say after e2compress has read the file but before the file is replaced with the compressed version) are lost. (For decompressing, no writes are possible because the EXT2_NOCOMPR_FL flag is set on the input file, which prevents any other processes from having the file open.) In both cases (compressing and decompressing) the results of ,any `chmod', `chown' or `touch' operation during this period` will be lost.

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