Add full preallocation (writing zeroes) (1711be8b) · Commits · git-mirror / virtual-dsm

run/disk.sh

+22 −15

Original line number	Diff line number	Diff line
		@@ -45,12 +45,22 @@ if [ -f "${DATA}" ]; then
		echo "ERROR: Specify a smaller size or disable preallocation with ALLOCATION=N." && exit 84
		fi

		if [ "$ALLOCATE" = "F" ]; then

		GB=$(( (REQ + 1073741823)/1073741824 ))
		echo "INFO: Writing ${GB} GB of zeroes, please wait.."

		dd if=/dev/zero of="${DATA}" seek="{OLD_SIZE}" count="${REQ}" bs=1M iflag=count_bytes oflag=seek_bytes

		else

		if ! fallocate -l "${DATA_SIZE}" "${DATA}"; then
		echo "ERROR: Could not allocate a file for the virtual disk." && exit 85
		fi

		fi
		fi
		fi

		if [ "$DATA_SIZE" -lt "$OLD_SIZE" ]; then

		@@ -82,11 +92,9 @@ if [ ! -f "${DATA}" ]; then

		if [ "$ALLOCATE" = "F" ]; then

		MB=$(( (DATA_SIZE + 1048575)/1048576 ))
		echo "INFO: Writing ${DISK_SIZE} of zeroes, please wait.."

		echo "INFO: Writing ${MB} MB of zeroes, please wait.."
		dd if=/dev/zero of="${DATA}" count="${MB}" bs=1M
		truncate -s "${DATA_SIZE}" "${DATA}"
		dd if=/dev/zero of="${DATA}" count="${DATA_SIZE}" bs=1M iflag=count_bytes

		else

		@@ -103,19 +111,18 @@ if [ ! -f "${DATA}" ]; then
		echo "ERROR: Virtual disk does not exist ($DATA)" && exit 88
		fi

		# Format as BTRFS filesystem
		mkfs.btrfs -q -L data -d single -m dup "${DATA}" > /dev/null

		fi

		# Check the filesize
		SIZE=$(stat -c%s "${DATA}")

		if [[ SIZE -ne DATA_SIZE ]]; then
		rm -f "${DATA}"
		echo "ERROR: Virtual disk has the wrong size: ${SIZE}" && exit 89
		fi

		# Format as BTRFS filesystem
		mkfs.btrfs -q -L data -d single -m dup "${DATA}" > /dev/null

		fi

		AGENT="${STORAGE}/${BASE}.agent"
		[ -f "$AGENT" ] && AGENT_VERSION=$(cat "${AGENT}") \|\| AGENT_VERSION=1