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dmhugedisk: Allow specifying of chunk size

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Ext4 will want to use dmhugedisk infrastructure for testing resize
bugs.  Ext4 fs images are rather sparse (especially with smaller
block sizes) so the current chunk size of 512 sectors leads to large
space consumption.  Allow test to specify chunk size.

Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
This commit is contained in:
Jan Kara
2018-05-29 18:55:56 +02:00
committed by Eryu Guan
parent 141bd37a36
commit 828f12b965
1 changed files with 6 additions and 1 deletions
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common/dmhugedisk
+6 -1
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@@ -31,6 +31,11 @@ _dmhugedisk_init()
{
test -z "$1" && _fatal "must specify sector count to _dmhugedisk_init"
local dm_backing_dev=$SCRATCH_DEV
local chunk_size="$2"
if [ -z "$chunk_size" ]; then
chunk_size=512
fi
$DMSETUP_PROG remove huge-test > /dev/null 2>&1
$DMSETUP_PROG remove huge-test-zero > /dev/null 2>&1
@@ -41,7 +46,7 @@ _dmhugedisk_init()
DMHUGEDISK_DEV='/dev/mapper/huge-test'
DMHUGEDISK_ZERO_TABLE="0 $blk_dev_size zero"
DMHUGEDISK_DEV_TABLE="0 $blk_dev_size snapshot $DMHUGEDISK_ZERO $SCRATCH_DEV N 512"
DMHUGEDISK_DEV_TABLE="0 $blk_dev_size snapshot $DMHUGEDISK_ZERO $SCRATCH_DEV N $chunk_size"
$DMSETUP_PROG create huge-test-zero --table "$DMHUGEDISK_ZERO_TABLE" || \
_fatal "failed to create dm huge zero device"