[PATCH] xfstests: Btrfs: add test for large metadata blocks

[Koen De Wit <koen.de.wit@oracle.com>]

Tests Btrfs filesystems with all possible metadata block sizes, by
setting large extended attributes on files.

Signed-off-by: Koen De Wit <koen.de.wit@oracle.com>
---
 tests/btrfs/036     |  128 +++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/btrfs/036.out |    7 +++
 tests/btrfs/group   |    1 +
 3 files changed, 136 insertions(+), 0 deletions(-)
 create mode 100644 tests/btrfs/036
 create mode 100644 tests/btrfs/036.out

diff --git a/tests/btrfs/036 b/tests/btrfs/036
new file mode 100644
index 0000000..0f8287a
--- /dev/null
+++ b/tests/btrfs/036
@@ -0,0 +1,128 @@
+#! /bin/bash
+# FS QA Test No. 036
+#
+# Tests large metadata blocks in btrfs, which allows large extended
+# attributes.
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2014, Oracle and/or its affiliates.  All Rights Reserved.
+#
+# 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
+#-----------------------------------------------------------------------
+
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+echo "QA output created by $seq"
+
+here=`pwd`
+status=1	# failure is the default!
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# real QA test starts here
+
+_supported_fs btrfs
+_supported_os Linux
+_require_scratch
+_need_to_be_root
+
+rm -f $seqres.full
+
+pagesize=`$here/src/feature -s`
+pagesize_kb=`expr $pagesize / 1024`
+
+# Test all valid leafsizes
+for leafsize in `seq $pagesize_kb $pagesize_kb 64`; do
+    _scratch_unmount >/dev/null 2>&1
+    _scratch_mkfs -l ${leafsize}K >/dev/null
+    _scratch_mount
+    # Calculate the xattr size, but leave 512 bytes for other metadata.
+    xattr_size=`expr $leafsize \* 1024 - 512`
+
+    touch $SCRATCH_MNT/emptyfile
+    # smallfile will be inlined, bigfile not.
+    $XFS_IO_PROG -f -c "pwrite 0 100" $SCRATCH_MNT/smallfile >/dev/null
+    $XFS_IO_PROG -f -c "pwrite 0 9000" $SCRATCH_MNT/bigfile >/dev/null
+    ln -s $SCRATCH_MNT/bigfile $SCRATCH_MNT/bigfile_softlink
+
+    files=(emptyfile smallfile bigfile bigfile_softlink)
+    chars=(a b c d)
+    for i in `seq 0 1 3`; do
+        char=${chars[$i]}
+        file=$SCRATCH_MNT/${files[$i]}
+        lnkfile=${file}_hardlink
+        ln $file $lnkfile
+        xattr_value=`head -c $xattr_size < /dev/zero | tr '\0' $char`
+
+        set_md5=`echo -n "$xattr_value" | md5sum`
+        ${ATTR_PROG} -Lq -s attr_$char -V $xattr_value $file
+        get_md5=`${ATTR_PROG} -Lq -g attr_$char $file | md5sum`
+        get_ln_md5=`${ATTR_PROG} -Lq -g attr_$char $lnkfile | md5sum`
+
+        # Using md5sums for comparison instead of the values themselves
+        # because bash command lines cannot be larger than 64K chars.
+        if [ "$set_md5" != "$get_md5" ]; then
+            echo "Got unexpected xattr value for attr_$char"
+            echo "from file $file . (leafsize is ${leafsize}K)"
+        fi
+        if [ "$set_md5" != "$get_ln_md5" ]; then
+            echo "Value for attr_$char differs for $file and"
+            echo "$lnkfile . (leafsize is ${leafsize}K)"
+        fi
+    done
+
+    # Test attributes with a size larger than the leafsize.
+    # Should result in an error.
+    if [ "$leafsize" -lt "64" ]; then
+        # Bash command lines cannot be larger than 64K characters, so we
+        # do not test attribute values with a size >64KB.
+        xattr_size=`expr $leafsize \* 1024 + 512`
+        xattr_value=`head -c $xattr_size < /dev/zero | tr '\0' x`
+        ${ATTR_PROG} -q -s attr_toobig -V $xattr_value \
+            $SCRATCH_MNT/emptyfile >> $seqres.full 2>&1
+        if [ "$?" -eq "0" ]; then
+            echo "Expected error, xattr_size is bigger than ${leafsize}K"
+        fi
+    fi
+
+done
+
+# Illegal attribute name (more than 256 characters)
+attr_name=`head -c 260 < /dev/zero | tr '\0' n`
+${ATTR_PROG} -s $attr_name -V attribute_name_too_big \
+    $SCRATCH_MNT/emptyfile 2>&1 | head -n 1
+
+_scratch_unmount
+
+# Some illegal leafsizes
+
+_scratch_mkfs -l 0 2>> $seqres.full
+echo $?
+
+_scratch_mkfs -l 5678 2>> $seqres.full
+echo $?
+
+_scratch_mkfs -l `expr $pagesize / 2 + $pagesize` 2>> $seqres.full
+echo $?
+
+_scratch_mkfs -l 128K 2>> $seqres.full
+echo $?
+
+_scratch_mkfs -l K
+
+# success, all done
+status=0
+exit
diff --git a/tests/btrfs/036.out b/tests/btrfs/036.out
new file mode 100644
index 0000000..1d9bdfb
--- /dev/null
+++ b/tests/btrfs/036.out
@@ -0,0 +1,7 @@
+QA output created by 036
+attr_set: Invalid argument
+1
+1
+1
+1
+ERROR: size value is empty
diff --git a/tests/btrfs/group b/tests/btrfs/group
index f9f062f..2ca2225 100644
--- a/tests/btrfs/group
+++ b/tests/btrfs/group
@@ -37,3 +37,4 @@
 032 auto quick
 033 auto quick
 034 auto quick
+036 auto quick
-- 
1.7.1