rw-devices patch for rsyncing block devices

[Václav Ovsík]

Hi,
I rebased rw-devices patch for rsync last weekend. Seems to me it works
"incrementally". Attached are
    * six git commits, or
    * one complete patch
on top of current development rsync branch (master branch commit
60ef39705797c9df7069297eb4ed5feab5e88f29).

bobek:/data/soft/rsync/rsync# dd if=/dev/urandom of=/dev/mapper/vg-pokus1
dd: writing to `/dev/mapper/vg-pokus1': No space left on device
65537+0 records in
65536+0 records out
33554432 bytes (34 MB) copied, 6.53098 s, 5.1 MB/s
bobek:/data/soft/rsync/rsync# dd if=/dev/mapper/vg-pokus1 of=/dev/mapper/vg-pokus2
65536+0 records in
65536+0 records out
33554432 bytes (34 MB) copied, 2.58308 s, 13.0 MB/s
bobek:/data/soft/rsync/rsync# dd if=/dev/urandom bs=1M seek=16 count=1 of=/dev/mapper/vg-pokus2
1+0 records in
1+0 records out
1048576 bytes (1.0 MB) copied, 0.147337 s, 7.1 MB/s
bobek:/data/soft/rsync/rsync# ./rsync --rsync-path\="$PWD/rsync" -v --bwlimit=100 --progress --rw-devices /dev/mapper/vg-pokus1 root at localhost:/dev/mapper/vg-pokus2
vg-pokus1
     33,554,432 100%    3.14MB/s    0:00:10 (xfr#1, to-chk=0/1)

sent 1,076,932 bytes  received 40,593 bytes  89,402.00 bytes/sec
total size is 33,554,432  speedup is 30.03


Have this patch any chance to get between rsync-patches?
I just looked into http://gitweb.samba.org/?p=rsync-patches.git;a=tree
and copy-devices.diff and write-devices.diff are in it.
Maybe rw-devices patch can replace these two.

I think a group of users want to use rsync to copy disk images.
Scenario: I want to virtualize some physical machine:
    * dd a physical dirty disk image from live system to target system,
    * stop the machine and boot into live system (r.g. System Rescue CD)
    * rsync disk changes from unmounted clean filesystems to target
      system,
    * mabe make some changes (fstab,...)?
    * start a new virtual machine
I think rsync can be interesting in similar scenarios.

Regards
-- 
Zito
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