extents and 48bit blk changes for ext4 filesystem

As we have forked the ext4 filesystem and JBD2, this is an update the previously known as 48bit ext3 patches

changes since last time:
-rebase all previous ext3 patches to against ext4/jbd2 -fixed an reservation window intialization issue with extent block allocation
and merge the change to the parent patch:ext4-extents.patch -merged prevous bug fixes patches from sct for 64 jbd2 to their parent patch:64bit-jbd2-core.patch
-merged ext3-extents-fsblk_t patch to ext4-extents-48bit.patch -merged
64bit-incompat-flag-change.patch ext3-sb-struc-sync-with-e2fsprog.patch
to parent patch
64bit-metadata.patch

A complete series of patches (including forking ext4 filesystem patches and 48bit patches submitted here) could be found at:
http://ext2.sourceforge.net/48bitext3/patches/latest/

To test the new ext3dev filesystem, just mount the filesystem with -t ext3dev. By default ext3dev is still running 32 bit mode and without extents. To testing extents and 48bit block number, need -o extent mount option. (Maybe we should enable extent as default for ext3dev filesystem ?)

Tested these patches on i386 and passed a few hours fsx test.

Thanks,

Mingming

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