On Thu, Mar 25, 2021 at 03:03:14PM +0530, Chandan Babu R wrote:

On 23 Mar 2021 at 09:50, Darrick J. Wong wrote:

quoted

From: Darrick J. Wong <djwong@kernel.org>

Add a new test to make sure the xfs_db path command works the way the
author thinks it should.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---
 tests/xfs/917     |   98 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/xfs/917.out |   19 ++++++++++
 tests/xfs/group   |    1 +
 3 files changed, 118 insertions(+)
 create mode 100755 tests/xfs/917
 create mode 100644 tests/xfs/917.out

diff --git a/tests/xfs/917 b/tests/xfs/917
new file mode 100755
index 00000000..bf21b290
--- /dev/null
+++ b/tests/xfs/917

@@ -0,0 +1,98 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Copyright (c) 2021 Oracle.  All Rights Reserved.
+#
+# FS QA Test No. 917
+#
+# Make sure the xfs_db path command works the way the author thinks it does.
+# This means that it can navigate to random inodes, fails on paths that don't
+# resolve.
+#
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1    # failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+	cd /
+	rm -f $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# real QA test starts here
+_supported_fs xfs
+_require_xfs_db_command "path"
+_require_scratch
+
+echo "Format filesystem and populate"
+_scratch_mkfs > $seqres.full
+_scratch_mount >> $seqres.full
+
+mkdir $SCRATCH_MNT/a
+mkdir $SCRATCH_MNT/a/b
+$XFS_IO_PROG -f -c 'pwrite 0 61' $SCRATCH_MNT/a/c >> $seqres.full
+ln -s -f c $SCRATCH_MNT/a/d
+mknod $SCRATCH_MNT/a/e b 8 0
+ln -s -f b $SCRATCH_MNT/a/f

Later in the test script, there are two checks corresponding to accessibility
of file symlink and dir symlink. However, $SCRATCH_MNT/a/d and
$SCRATCH_MNT/a/f are actually referring to non-existant files since current
working directory at the time of invocation of ln command is the xfstests
directory.

i.e. 'c' and 'b' arguments to 'ln' command above must be qualified with
$SCRATCH_MNT/a/.

Hm?  d and f look fine to me:

$ ./check xfs/917
$ mount /dev/sdf /opt
$ cd /opt/a
$ ls
total 4
drwxr-xr-x 2 root root    6 Mar 25 09:25 b/
-rw------- 1 root root   61 Mar 25 09:25 c
lrwxrwxrwx 1 root root    1 Mar 25 09:25 d -> c
brw-r--r-- 1 root root 8, 0 Mar 25 09:25 e
lrwxrwxrwx 1 root root    1 Mar 25 09:25 f -> b/

The link target is copied verbatim into the symlink, so I don't see why
they need to be qualified?

(FWIW the path command doesn't resolve symlinks, so it really only
checks that /a/d and /a/f exist and are of type symlink.)

--D

quoted

+
+_scratch_unmount
+
+echo "Check xfs_db path on directories"
+_scratch_xfs_db -c 'path /a' -c print | grep -q 'sfdir.*count.* 5$' || \
+	echo "Did not find directory /a"
+
+_scratch_xfs_db -c 'path /a/b' -c print | grep -q sfdir || \
+	echo "Did not find empty sf directory /a/b"
+
+echo "Check xfs_db path on files"
+_scratch_xfs_db -c 'path /a/c' -c print | grep -q 'core.size.*61' || \
+	echo "Did not find 61-byte file /a/c"
+
+echo "Check xfs_db path on file symlinks"
+_scratch_xfs_db -c 'path /a/d' -c print | grep -q symlink || \
+	echo "Did not find symlink /a/d"
+
+echo "Check xfs_db path on bdevs"
+_scratch_xfs_db -c 'path /a/e' -c print | grep -q 'format.*dev' || \
+	echo "Did not find bdev /a/e"
+
+echo "Check xfs_db path on dir symlinks"
+_scratch_xfs_db -c 'path /a/f' -c print | grep -q symlink || \
+	echo "Did not find symlink /a/f"

--
chandan