[PATCH 06/12] create a helper to clone devices

From: Anand Jain <anand.jain@oracle.com>
To: fstests@vger.kernel.org
Cc: linux-btrfs@vger.kernel.org
Subject: [PATCH 06/12] create a helper to clone devices
Date: Thu, 15 Feb 2024 14:34:09 +0800	[thread overview]
Message-ID: <8a9a66bdd309ea6ea81c3586674922517c3460be.1707969354.git.anand.jain@oracle.com> (raw)
In-Reply-To: <cover.1707969354.git.anand.jain@oracle.com>

The function create_cloned_devices() takes two devices, creates
a filesystem using mkfs, and clones the content from one device
to another using device dump.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
---
 common/btrfs | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/common/btrfs b/common/btrfs
index 5cba9b16b4de..61d5812d49d9 100644
--- a/common/btrfs
+++ b/common/btrfs
@@ -826,3 +826,25 @@ check_fsid()
 	echo -e -n "Tempfsid status:\t"
 	cat /sys/fs/btrfs/$tempfsid/temp_fsid
 }
+
+create_cloned_devices()
+{
+	local dev1=$1
+	local dev2=$2
+
+	[[ -z $dev1 || -z $dev2 ]] && \
+		_fail "BUGGY code, create_cloned_devices needs arg1 arg3"
+
+	echo -n Creating cloned device...
+	_mkfs_dev -fq -b $((1024 * 1024 * 300)) $dev1
+
+	_mount $dev1 $SCRATCH_MNT
+
+	$XFS_IO_PROG -fc 'pwrite -S 0x61 0 9000' $SCRATCH_MNT/foo | \
+								_filter_xfs_io
+	umount $SCRATCH_MNT
+	# device dump of $dev1 to $dev2
+	dd if=$dev1 of=$dev2 bs=300M count=1 conv=fsync status=none || \
+							_fail "dd failed: $?"
+	echo done
+}
-- 
2.39.3

