| #! /bin/bash |
| # FS QA Test No. btrfs/108 |
| # |
| # Test that a send operation works correctly with reflinked files (cloned |
| # extents which multiple files point to). |
| # |
| #----------------------------------------------------------------------- |
| # 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() |
| { |
| cd / |
| rm -fr $send_files_dir |
| rm -f $tmp.* |
| } |
| |
| # get standard environment, filters and checks |
| . ./common/rc |
| . ./common/filter |
| . ./common/reflink |
| |
| # real QA test starts here |
| _supported_fs btrfs |
| _supported_os Linux |
| _require_scratch |
| _require_cp_reflink |
| _require_xfs_io_command "fpunch" |
| |
| send_files_dir=$TEST_DIR/btrfs-test-$seq |
| |
| rm -f $seqres.full |
| rm -fr $send_files_dir |
| mkdir $send_files_dir |
| |
| _scratch_mkfs >>$seqres.full 2>&1 |
| _scratch_mount |
| |
| # Create our test file with a single 100K extent. |
| $XFS_IO_PROG -f -c "pwrite -S 0xaa 0K 100K" $SCRATCH_MNT/foo | _filter_xfs_io |
| |
| # Clone our file into a new file named bar. |
| cp --reflink=always $SCRATCH_MNT/foo $SCRATCH_MNT/bar |
| |
| # Now overwrite parts of our foo file. |
| $XFS_IO_PROG -c "pwrite -S 0xbb 50K 10K" \ |
| -c "pwrite -S 0xcc 90K 10K" \ |
| -c "fpunch 70K 10k" \ |
| $SCRATCH_MNT/foo | _filter_xfs_io |
| |
| _run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/snap |
| |
| echo "File digests in the original filesystem:" |
| md5sum $SCRATCH_MNT/snap/foo | _filter_scratch |
| md5sum $SCRATCH_MNT/snap/bar | _filter_scratch |
| |
| _run_btrfs_util_prog send -f $send_files_dir/1.snap $SCRATCH_MNT/snap |
| |
| # Now recreate the filesystem by receiving the send stream and verify we get |
| # the same file contents that the original filesystem had. |
| _scratch_unmount |
| _scratch_mkfs >>$seqres.full 2>&1 |
| _scratch_mount |
| |
| _run_btrfs_util_prog receive -f $send_files_dir/1.snap $SCRATCH_MNT |
| |
| # We expect the destination filesystem to have exactly the same file data as |
| # the original filesystem. |
| # The btrfs send implementation had a bug where it sent a clone operation from |
| # file foo into file bar covering the whole [0, 100K[ range after creating |
| # and writing the file foo. This was incorrect because the file bar now included |
| # the updates done to file foo after we cloned foo to bar, breaking the COW |
| # nature of reflink copies (cloned extents). |
| echo "File digests in the new filesystem:" |
| md5sum $SCRATCH_MNT/snap/foo | _filter_scratch |
| md5sum $SCRATCH_MNT/snap/bar | _filter_scratch |
| |
| status=0 |
| exit |