diff options
author | Andrew Cady <d@jerkface.net> | 2016-04-22 22:00:58 -0400 |
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committer | Andrew Cady <d@jerkface.net> | 2016-04-22 22:45:17 -0400 |
commit | 642351efec733b36ac0863ee4f04462a8ac171bb (patch) | |
tree | 56d3adf3fb202c0527df1f9ea3befa52e59c221a /loop-layer.sh | |
parent | 004812b461ff45c8771c5513afa379a32d322046 (diff) |
workaround for btrfs limitation (read-only seed fix)
Diffstat (limited to 'loop-layer.sh')
-rw-r--r-- | loop-layer.sh | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/loop-layer.sh b/loop-layer.sh new file mode 100644 index 0000000..7e08e12 --- /dev/null +++ b/loop-layer.sh | |||
@@ -0,0 +1,15 @@ | |||
1 | losetup_snapshot() | ||
2 | { | ||
3 | local ro_dev rw_dev new_dev_name size persist chunksize | ||
4 | ro_file=$1 | ||
5 | rw_file=$2 | ||
6 | |||
7 | ro_dev=$(LoSetup -r -f --show "$ro_file") || return | ||
8 | rw_dev=$(LoSetup -f --show "$rw_file") || return | ||
9 | new_dev_name=${ro_dev##*/} | ||
10 | size=$(blockdev --getsz "$ro_dev") || return | ||
11 | persist=p | ||
12 | chunksize=16 | ||
13 | dmsetup create "$new_dev_name" --table "0 $size snapshot $ro_dev $rw_dev $persist $chunksize" || return | ||
14 | echo /dev/mapper/"$new_dev_name" | ||
15 | } | ||