btrfs-progs: mkfs-tests: a new test case for --inode-flags

The simple test will create a layout like the following:

rootdir
|- file1
|- file2
|- subv/		<< Regular subvolume
|  |- file3
|- nocow_subv/		<< NODATACOW subvolume
|  |- file4
|- nocow_dir/		<< NODATACOW directory
|  |- dir2
|  |  |- file5
|  |- file6
|- nocow_file1		<< NODATACOW file

Any files under NODATACOW subvolume/directory should also be NODATACOW.
The explicitly specified single file should also be NODATACOW.

Signed-off-by: Qu Wenruo <[email protected]>

Author: adam900710

tests/mkfs-tests/038-inode-flags/test.sh

@@ -0,0 +1,55 @@
+#!/bin/bash
+# Basic test for mkfs.btrfs --inode-flags --rootdir. Create a dataset and use it as
+# rootdir, then various inode-flags and verify the flag is properly set.
+
+source "$TEST_TOP/common" || exit
+
+check_prereq mkfs.btrfs
+check_prereq btrfs
+check_global_prereq lsattr
+
+setup_root_helper
+prepare_test_dev
+
+tmp=$(_mktemp_dir mkfs-rootdir)
+
+write_file()
+{
+	local path="$1"
+	local size="$2"
+
+	run_check dd if=/dev/zero of="$path" bs="$size" count=1 status=noxfer > /dev/null 2>&1
+}
+
+check_nodatacow()
+{
+	local path="$1"
+
+	lsattr "$TEST_MNT"/"$path" | grep -q C || _fail "missing NODATACOW flag for $path"
+}
+
+write_file "$tmp/file1" 64K
+write_file "$tmp/file2" 64K
+run_check mkdir -p "$tmp/subv" "$tmp/nocow_subv" "$tmp/nocow_dir/dir2"
+write_file "$tmp/subv/file3" 64K
+write_file "$tmp/nocow_subv/file4" 64K
+write_file "$tmp/nocow_dir/dir2/file5" 64K
+write_file "$tmp/nocow_dir/file6" 64K
+write_file "$tmp/nocow_file1" 64K
+
+run_check_mkfs_test_dev --rootdir "$tmp" --inode-flags nodatacow:nocow_subv \
+	--subvol nocow_subv --inode-flags nodatacow:nocow_dir \
+	--inode-flags nodatacow:nocow_file1
+
+run_check $SUDO_HELPER "$TOP/btrfs" check "$TEST_DEV"
+
+run_check_mount_test_dev
+check_nodatacow "nocow_subv"
+check_nodatacow "nocow_subv/file4"
+check_nodatacow "nocow_dir"
+check_nodatacow "nocow_dir/file6"
+check_nodatacow "nocow_dir/dir2/file5"
+check_nodatacow "nocow_file1"
+run_check lsattr -R "$TEST_MNT"
+run_check_umount_test_dev
+run_check rm -rf -- "$tmp"