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dom0: make block-snapshot more robust about finding the right loop dev

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Use losetup -j to find already assigned loop device, instead of manually
parsing losetup -a output (which have changed between fc13 and fc18).
This commit is contained in:
Marek Marczykowski 2013-02-09 01:05:45 +01:00
parent 58eeda8723
commit d6a0ddc8bd
1 changed files with 3 additions and 12 deletions
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15
misc/block-snapshot
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@ -28,21 +28,12 @@ get_dev() {
if [ -f "$dev" ]; then if [ -f "$dev" ]; then
file=$dev file=$dev
inode=$(stat -c '%i' "$file") loopdev=$(losetup -j $file | head -1 | cut -d : -f 1)
devnum=$(stat -c '%D' "$file") if [ -n "$loopdev" ]; then
if [ -z "$inode" ] || [ -z "$devnum" ]
then
release_lock "block"
fatal "Unable to lookup $file: dev: $devnum inode: $inode"
fi
dev_list=$(losetup -a | grep ' \[0*'${devnum}'\]:'${inode} | cut -d : -f 1)
for loopdev in $dev_list; do
# found existing loop to this file # found existing loop to this file
echo $loopdev echo $loopdev
return return
done fi
# assign new loop device # assign new loop device
loopdev=$(losetup -f 2>/dev/null || find_free_loopback_dev) loopdev=$(losetup -f 2>/dev/null || find_free_loopback_dev)