+#!/bin/bash
+# FS QA Test No. xfs/013
+#
+# Exercise the free inode btree (finobt). XFS allocates physical inodes in
+# chunks of 64. Inode records with at least one free inode are stored in the
+# finobt to optimize free inode lookup. This test runs a workload that creates
+# and modifies a sparsely allocated set of inodes in combination with an
+# fsstress workload.
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2014 Red Hat, Inc. 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`
+tmp=/tmp/$$
+status=1 # failure is the default!
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+_cleanup()
+{
+ killall fsstress 2>/dev/null
+ cd /
+ umount $SCRATCH_MNT 2>/dev/null
+ rm -f $tmp.*
+}
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_create()
+{
+ dir=$1
+ count=$2
+
+ mkdir -p $dir
+ for i in $(seq 0 $count)
+ do
+ touch $dir/$i
+ done
+}
+
+_rand_replace()
+{
+ dir=$1
+ count=$2
+
+ # replace 5% of the dataset
+ for i in $(seq 0 $((count / 20)))
+ do
+ file=$((RANDOM % count))
+ rm -f $dir/$file
+ touch $dir/$file
+ done
+}
+
+_cleaner()
+{
+ dir=$1
+ iters=$2
+ mindirs=$3
+
+ iters=$((iters - mindirs))
+
+ for i in $(seq 1 $iters)
+ do
+ need=$dir/dir$((i + mindirs))
+ while [ ! -e $need ]
+ do
+ sleep 3
+ done
+
+ rm -rf $dir/dir$i
+ done
+}
+
+# real QA test starts here
+_supported_fs xfs
+_supported_os Linux
+
+_require_scratch
+_require_xfs_mkfs_finobt
+_require_xfs_finobt
+
+rm -f $seqres.full
+
+_scratch_mkfs_xfs "-m crc=1,finobt=1 -d agcount=2" | \
+ _filter_mkfs 2>> $seqres.full
+_scratch_mount
+
+COUNT=20000 # number of files per directory
+LOOPS=15 # last loop iteration
+MINDIRS=2 # number of dirs for the cleaner to leave trailing behind the
+ # most recent (no less than 2 to prevent an rm from trampling a
+ # clone)
+
+# create initial directory
+_create $SCRATCH_MNT/dir1 $COUNT
+
+# start background cleaner to remove old directories as new ones are created
+_cleaner $SCRATCH_MNT $LOOPS $MINDIRS &
+
+# start a background stress workload on the fs
+$FSSTRESS_PROG -d $SCRATCH_MNT/fsstress -w -n 9999999 -p 2 -S t \
+ >> $seqres.full 2>&1 &
+
+# Each cycle clones the current directory and makes a random file replacement
+# pass on the new directory. The directory is copied to the next using hard
+# links. The replacement pass then randomly removes and replaces ~5% of the
+# content in the directory. Files replaced as such are effectively marked to be
+# freed by the background cleaner as it moves forward and removes all of the
+# previous hard links to the inode. Over several iterations, this workload
+# creates a sparsely located set of a free inodes across the set and uses the
+# finobt to allocate new inodes for replacement.
+
+for i in $(seq 1 $LOOPS)
+do
+ # hard link the content of the current directory to the next
+ cp -Rl $SCRATCH_MNT/dir$i $SCRATCH_MNT/dir$((i+1))
+
+ # do a random replacement of files in the new directory
+ _rand_replace $SCRATCH_MNT/dir$((i+1)) $COUNT
+done
+
+killall fsstress
+wait
+
+# clean out the competing fsstress allocations, then everything else
+rm -rf $SCRATCH_MNT/fsstress
+rm -rf $SCRATCH_MNT/dir*
+
+umount $SCRATCH_MNT
+_check_scratch_fs
+
+status=0
+exit
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