| #! /bin/bash |
| # FS QA Test No. btrfs/105 |
| # |
| # Test that an incremental send works after a file from the parent snapshot |
| # gets replaced in the send snapshot by another one at the same exact location, |
| # with the same name and with the same inode number. |
| # |
| #----------------------------------------------------------------------- |
| # Copyright (C) 2015 SUSE Linux Products GmbH. All Rights Reserved. |
| # Author: Filipe Manana <fdmanana@suse.com> |
| # Copyright (C) 2015 Martin Raiber <martin@urbackup.org> |
| # |
| # 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 $tmp.* |
| } |
| |
| # get standard environment, filters and checks |
| . ./common/rc |
| . ./common/filter |
| |
| # real QA test starts here |
| _supported_fs btrfs |
| _supported_os Linux |
| _require_scratch |
| |
| send_files_dir=$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 extent of 64K. |
| mkdir -p $SCRATCH_MNT/foo |
| $XFS_IO_PROG -f -c "pwrite -S 0xaa 0 64K" $SCRATCH_MNT/foo/bar | _filter_xfs_io |
| |
| _run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/mysnap1 |
| _run_btrfs_util_prog subvolume snapshot $SCRATCH_MNT $SCRATCH_MNT/mysnap2 |
| |
| echo "File digest before being replaced:" |
| md5sum $SCRATCH_MNT/mysnap1/foo/bar | _filter_scratch |
| |
| # Remove the file and then create a new one in the same location with the same |
| # name but with different content. This new file ends up getting the same inode |
| # number as the previous one, because that inode number was the highest inode |
| # number used by the snapshot's root and therefore when attempting to find the |
| # a new inode number for the new file, we end up reusing the same inode number. |
| # This happens because currently btrfs uses the highest inode number summed by 1 |
| # for the first inode created once a snapshot's root is loaded (done at |
| # fs/btrfs/inode-map.c:btrfs_find_free_objectid in the linux kernel tree). |
| # Having these two different files in the snapshots with the same inode number |
| # (but different generation numbers) caused the btrfs send code to emit an |
| # incorrect path for the file when issuing an unlink operation because it failed |
| # to realize they were different files. |
| rm -f $SCRATCH_MNT/mysnap2/foo/bar |
| $XFS_IO_PROG -f -c "pwrite -S 0xbb 0 96K" \ |
| $SCRATCH_MNT/mysnap2/foo/bar | _filter_xfs_io |
| |
| _run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT/mysnap2 \ |
| $SCRATCH_MNT/mysnap2_ro |
| |
| _run_btrfs_util_prog send -f $send_files_dir/1.snap $SCRATCH_MNT/mysnap1 |
| _run_btrfs_util_prog send -p $SCRATCH_MNT/mysnap1 -f $send_files_dir/2.snap \ |
| $SCRATCH_MNT/mysnap2_ro |
| |
| echo "File digest in the original filesystem after being replaced:" |
| md5sum $SCRATCH_MNT/mysnap2_ro/foo/bar | _filter_scratch |
| |
| # Now recreate the filesystem by receiving both send streams and verify we get |
| # the same file contents that the original filesystem had. |
| _scratch_unmount |
| _scratch_mkfs >>$seqres.full 2>&1 |
| _scratch_mount |
| |
| _run_btrfs_util_prog receive -f $send_files_dir/1.snap $SCRATCH_MNT |
| _run_btrfs_util_prog receive -f $send_files_dir/2.snap $SCRATCH_MNT |
| |
| echo "File digest in the new filesystem:" |
| # Must match the digest from the new file. |
| md5sum $SCRATCH_MNT/mysnap2_ro/foo/bar | _filter_scratch |
| |
| status=0 |
| exit |