[RFC][PATCH 0/12] e2fsprogs: add 64-bit support

[Valerie Clement <valerie.clement@bull.net>]

Hi Ted,

Here is the new version of our e2fsprogs patches to add the 64-bit 
support in the e2fsprogs tools.

First, I introduced a new compilation option to build e2fsprogs 
utilities for ext4 filesytems and not break backwards compatiblity with 
ext2/3 filesystems.

So most of the new code for ext4 is included under #ifdef _EXT4FS_.

The major change is that when compiling with _EXT4FS_ option, blk_t is 
64 bits.

I tried to create new interfaces for ext4 which use the new type blk64_t 
you defined, so most of the code in the patches 03 and 05 are simply 
duplicated from the 32-bit version.

This patchset is also not complete:
TODO:
   - support of 48-bit in extents to complete,
   - support of 48-bit block number for ACL to do,
   - change the format string %u for a block number to %llu in case of 
64 bits (many occurences in the code),
   - update code under ext2ed/,
   - and surely other utilities/interfaces I don't use or know to port.

Code compiled, booted and briefly tested on a 20TB device (mkfs, 
debugfs, e2fsck, dumpe2fs, filefrag tested)
Some non-regression tests also done on ext3 filesystems when compiling 
code without _EXT4FS_ option.

I splitted the changes into 12 patches to facilitate the review of the 
patches. I hope this work will be able to make progress on the code for 
the 64-bit support.
   Valérie