Test trim of last small AG for large filesystem resizes

As reported at
http://article.gmane.org/gmane.comp.file-systems.xfs.general/29187
this trimming may cause an overflow in the new size calculation.

Patch to fix it, and testcase at
http://article.gmane.org/gmane.comp.file-systems.xfs.general/29193

Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Reviewed-by: Christoph Hellwig <hch@lst.de>

206

@@ -0,0 +1,97 @@
+#! /bin/sh
+# FS QA Test No. 206
+#
+# Test trim of last small AG for large filesystem resizes
+#
+# As reported at
+# http://article.gmane.org/gmane.comp.file-systems.xfs.general/29187
+# this trimming may cause an overflow in the new size calculation.
+# Patch and testcase at
+# http://article.gmane.org/gmane.comp.file-systems.xfs.general/29193
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2009 Eric Sandeen.
+#
+# 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
+#-----------------------------------------------------------------------
+#
+# creator
+owner=sandeen@sandeen.net
+
+seq=`basename $0`
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1	# failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+    umount $tmpdir
+    rmdir $tmpdir
+    rm -f $tmp
+    rm -f $tmpfile
+}
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+
+# real QA test starts here
+
+# Modify as appropriate.
+_supported_fs xfs
+_supported_os IRIX Linux
+
+bitsperlong=`src/feature -w`
+if [ "$bitsperlong" -ne 64 ]; then
+	_notrun "This test is only valid on 64 bit machines"
+fi
+
+rm -f $seq.full
+
+tmpfile=$TEST_DIR/fsfile.$$
+tmpdir=$TEST_DIR/tmpdir.$$
+
+mkdir -p $tmpdir || _fail "!!! failed to create temp mount dir"
+
+# Create a file w/ the offset we wish to resize to
+echo "=== truncate file ==="
+dd if=/dev/zero of=$tmpfile bs=1 seek=19998630180864 count=1 >/dev/null 2>&1 \
+	|| _fail "!!! failed to truncate loopback file to correct size"
+
+# mkfs slightly smaller than that
+echo "=== mkfs.xfs ==="
+mkfs.xfs -f -bsize=4096 -dagsize=76288719b,size=3905982455b -llazy-count=0 $tmpfile \
+	| sed -e "s,^meta-data=.*isize,meta-data=FILE                   isize,g"
+
+mount -o loop $tmpfile $tmpdir || _fail "!!! failed to loopback mount"
+
+# see what happens when we growfs it
+echo "=== xfs_growfs ==="
+xfs_growfs $tmpdir \
+	| sed -e "s,^meta-data=.*isize,meta-data=FILE                   isize,g"
+
+# and double-check the new geometry
+echo "=== xfs_info ==="
+xfs_info $tmpdir \
+	| sed -e "s,^meta-data=.*isize,meta-data=FILE                   isize,g"
+
+# _cleanup cleans up for us
+
+# success, all done
+status=0
+exit
+

206.out

@@ -0,0 +1,20 @@
+QA output created by 206
+=== truncate file ===
+=== mkfs.xfs ===
+meta-data=FILE                   isize=256    agcount=52, agsize=76288719 blks
+         =                       sectsz=512   attr=2
+data     =                       bsize=4096   blocks=3905982455, imaxpct=5
+         =                       sunit=0      swidth=0 blks
+naming   =version 2              bsize=4096   ascii-ci=0
+log      =internal log           bsize=4096   blocks=32768, version=2
+         =                       sectsz=512   sunit=0 blks, lazy-count=0
+realtime =none                   extsz=4096   blocks=0, rtextents=0
+=== xfs_growfs ===
+meta-data=FILE                   isize=256    agcount=52, agsize=76288719 blks
+         =                       sectsz=512   attr=2
+data     =                       bsize=4096   blocks=3905982455, imaxpct=5
+         =                       sunit=0      swidth=0 blks
+naming   =version 2              bsize=4096   ascii-ci=0
+log      =internal               bsize=4096   blocks=32768, version=2
+         =                       sectsz=512   sunit=0 blks, lazy-count=0
+realtime =none                   extsz=4096   blocks=0, rtextents=0

group

@@ -310,3 +310,4 @@ atime
 203 ioctl auto
 204 metadata rw auto
 205 metadata rw auto
+206 growfs auto quick