Zdenek Kabelac 40e6176d25 snapshots: fix incorrect calculation of cow size ...

Code uses target driver version for better estimation of
max size of COW device for snapshot.

The bug can be tested with this script:
VG=vg1
lvremove -f $VG/origin
set -e
lvcreate -L 2143289344b -n origin $VG
lvcreate -n snap -c 8k -L 2304M -s $VG/origin
dd if=/dev/zero of=/dev/$VG/snap bs=1M count=2044 oflag=direct

The bug happens when these two conditions are met
* origin size is divisible by (chunk_size/16) - so that the last
  metadata area is filled completely
* the miscalculated snapshot metadata size is divisible by extent size -
  so that there is no padding to extent boundary which would otherwise
  save us

Signed-off-by:Mikulas Patocka <mpatocka@redhat.com>

2014-02-26 14:25:09 +01:00

..

.exported_symbols

Begin to separate out segment types.

2004-05-04 21:25:57 +00:00

Makefile.in

Install plugins to subdirs

2010-05-06 10:07:46 +00:00

snapshot.c

snapshots: fix incorrect calculation of cow size

2014-02-26 14:25:09 +01:00