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Date:   Thu,  6 Jun 2019 15:31:37 -0400
From:   Gabriel Krisman Bertazi <krisman@...labora.com>
To:     tytso@....edu
Cc:     fstests@...r.kernel.org, linux-ext4@...r.kernel.org,
        Gabriel Krisman Bertazi <krisman@...labora.com>
Subject: [PATCH v2 1/2] common/casefold: Add infrastructure to test filename casefold feature

Add a set of basic helper functions to simplify the testing of
casefolding capable filesystems.

Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>
---
 common/casefold | 108 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 108 insertions(+)
 create mode 100644 common/casefold

diff --git a/common/casefold b/common/casefold
new file mode 100644
index 000000000000..34c1d4ae1af1
--- /dev/null
+++ b/common/casefold
@@ -0,0 +1,108 @@
+#-----------------------------------------------------------------------
+#
+# Common functions for testing filename casefold feature
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2018 Collabora, Ltd.  All Rights Reserved.
+#
+# Author: Gabriel Krisman Bertazi <krisman@...labora.com>
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it would be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write the Free Software Foundation,
+# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#-----------------------------------------------------------------------
+
+_has_casefold_feature_kernel_support() {
+    case $FSTYP in
+	ext4)
+	    test -f '/sys/fs/ext4/features/casefold'
+	    ;;
+	*)
+	    # defaults to unsupported
+	    false
+	    ;;
+    esac
+}
+
+_require_casefold_support() {
+    if ! _has_casefold_feature_kernel_support ; then
+	_notrun "$FSTYP does not support casefold feature"
+    fi
+
+    if ! _scratch_mkfs_casefold &>>seqres.full; then
+	_notrun "$FSTYP userspace tools do not support casefold"
+    fi
+
+    # Make sure the kernel can mount a filesystem with the encoding
+    # defined by the userspace tools.  This will fail if
+    # the userspace tool used a more recent encoding than the one
+    # supported in kernel space.
+    if ! _try_scratch_mount &>>seqres.full; then
+	_notrun \
+	    "kernel can't mount filesystem using the encoding set by userspace"
+    fi
+    _scratch_unmount
+}
+
+_scratch_mkfs_casefold () {
+    case $FSTYP in
+	ext4)
+	    _scratch_mkfs -O casefold $*
+	    ;;
+	*)
+	    _notrun "Don't know how to mkfs with casefold support on $FSTYP"
+	    ;;
+	esac
+}
+
+_scratch_mkfs_casefold_strict () {
+    case $FSTYP in
+	ext4)
+	    _scratch_mkfs -O casefold -E encoding_flags=strict
+	    ;;
+	*)
+	    _notrun \
+		"Don't know how to mkfs with casefold-strict support on $FSTYP"
+	    ;;
+	esac
+}
+
+_casefold_check_exact_name () {
+    # To get the exact disk name, we need some method that does a
+    # getdents() on the parent directory, such that we don't get
+    # normalized/casefolded results.  'Find' works ok.
+    basedir=$1
+    exact_name=$2
+    find ${basedir} | grep -q ${exact_name}
+}
+
+_try_set_casefold_attr () {
+    chattr +F "${1}" &>/dev/null
+}
+
+_try_unset_casefold_attr () {
+    chattr -F "${1}" &>/dev/null
+}
+
+_set_casefold_attr () {
+    _try_set_casefold_attr "${1}" || \
+	_fail "Unable to set casefold attribute on ${1}"
+}
+
+_unset_casefold_attr () {
+    _try_unset_casefold_attr "${1}" || \
+	_fail "Unable to unset casefold attribute on ${1}"
+}
+
+_is_casefolded_dir () {
+    lsattr -ld "${1}" | grep -q "Casefold"
+}
-- 
2.20.1

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