new file mode 100755
@@ -0,0 +1,109 @@
+#! /bin/bash
+# FSQA Test No. 100
+#
+# Regression test for file read corruption when using compressed extents that
+# are shared by multiple consecutive ranges of the same file.
+#
+#-----------------------------------------------------------------------
+#
+# Copyright (C) 2015 SUSE Linux Products GmbH. All Rights Reserved.
+# Author: Filipe Manana <fdmanana@suse.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
+#-----------------------------------------------------------------------
+#
+
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+echo "QA output created by $seq"
+tmp=/tmp/$$
+status=1 # failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+ rm -f $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# real QA test starts here
+_need_to_be_root
+_supported_fs btrfs
+_supported_os Linux
+_require_scratch
+_require_cloner
+
+rm -f $seqres.full
+
+test_clone_and_read_compressed_extent()
+{
+ local mount_opts=$1
+
+ _scratch_mkfs >>$seqres.full 2>&1
+ _scratch_mount $mount_opts
+
+ # Create a test file with a single extent that is compressed (the
+ # data we write into it is highly compressible no matter which
+ # compression algorithm is used, zlib or lzo).
+ $XFS_IO_PROG -f -c "pwrite -S 0xaa 0K 4K" \
+ -c "pwrite -S 0xbb 4K 8K" \
+ -c "pwrite -S 0xcc 12K 4K" \
+ $SCRATCH_MNT/foo | _filter_xfs_io
+
+ # Now clone our extent into an adjacent offset.
+ $CLONER_PROG -s $((4 * 1024)) -d $((16 * 1024)) -l $((8 * 1024)) \
+ $SCRATCH_MNT/foo $SCRATCH_MNT/foo
+
+ # Same as before but for this file we clone the extent into a lower
+ # file offset.
+ $XFS_IO_PROG -f -c "pwrite -S 0xaa 8K 4K" \
+ -c "pwrite -S 0xbb 12K 8K" \
+ -c "pwrite -S 0xcc 20K 4K" \
+ $SCRATCH_MNT/bar | _filter_xfs_io
+
+ $CLONER_PROG -s $((12 * 1024)) -d 0 -l $((8 * 1024)) \
+ $SCRATCH_MNT/bar $SCRATCH_MNT/bar
+
+ echo "File digests before unmounting filesystem:"
+ md5sum $SCRATCH_MNT/foo | _filter_scratch
+ md5sum $SCRATCH_MNT/bar | _filter_scratch
+
+ # Evicting the inode or clearing the page cache before reading again
+ # the file would also trigger the bug - reads were returning all bytes
+ # in the range corresponding to the second reference to the extent with
+ # a value of 0, but the correct data was persisted (it was a bug
+ # exclusively in the read path). The issue happened only if the same
+ # readpages() call targeted pages belonging to the first and second
+ # ranges that point to the same compressed extent.
+ _scratch_remount
+
+ echo "File digests after mounting filesystem again:"
+ # Must match the same digests we got before.
+ md5sum $SCRATCH_MNT/foo | _filter_scratch
+ md5sum $SCRATCH_MNT/bar | _filter_scratch
+}
+
+echo -e "\nTesting with zlib compression..."
+test_clone_and_read_compressed_extent "-o compress=zlib"
+
+_scratch_unmount
+
+echo -e "\nTesting with lzo compression..."
+test_clone_and_read_compressed_extent "-o compress=lzo"
+
+status=0
+exit
new file mode 100644
@@ -0,0 +1,41 @@
+QA output created by 100
+
+Testing with zlib compression...
+wrote 4096/4096 bytes at offset 0
+XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote 8192/8192 bytes at offset 4096
+XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote 4096/4096 bytes at offset 12288
+XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote 4096/4096 bytes at offset 8192
+XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote 8192/8192 bytes at offset 12288
+XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote 4096/4096 bytes at offset 20480
+XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+File digests before unmounting filesystem:
+4b985a45790261a706c3ddbf22c5f765 SCRATCH_MNT/foo
+fd331e6b7a9ab105f48f71b53162d5b5 SCRATCH_MNT/bar
+File digests after mounting filesystem again:
+4b985a45790261a706c3ddbf22c5f765 SCRATCH_MNT/foo
+fd331e6b7a9ab105f48f71b53162d5b5 SCRATCH_MNT/bar
+
+Testing with lzo compression...
+wrote 4096/4096 bytes at offset 0
+XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote 8192/8192 bytes at offset 4096
+XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote 4096/4096 bytes at offset 12288
+XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote 4096/4096 bytes at offset 8192
+XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote 8192/8192 bytes at offset 12288
+XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote 4096/4096 bytes at offset 20480
+XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+File digests before unmounting filesystem:
+4b985a45790261a706c3ddbf22c5f765 SCRATCH_MNT/foo
+fd331e6b7a9ab105f48f71b53162d5b5 SCRATCH_MNT/bar
+File digests after mounting filesystem again:
+4b985a45790261a706c3ddbf22c5f765 SCRATCH_MNT/foo
+fd331e6b7a9ab105f48f71b53162d5b5 SCRATCH_MNT/bar
@@ -102,3 +102,4 @@
097 auto quick send clone
098 auto quick metadata clone
099 auto quick metadata enospc
+100 auto quick clone compress