2 # FS QA Test No. btrfs/111
4 # Test that resending snapshots from a different filesystem is possible for
5 # both full and incremental send operations.
7 #-----------------------------------------------------------------------
8 # Copyright (C) 2015 SUSE Linux Products GmbH. All Rights Reserved.
9 # Author: Filipe Manana <fdmanana@suse.com>
11 # This program is free software; you can redistribute it and/or
12 # modify it under the terms of the GNU General Public License as
13 # published by the Free Software Foundation.
15 # This program is distributed in the hope that it would be useful,
16 # but WITHOUT ANY WARRANTY; without even the implied warranty of
17 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 # GNU General Public License for more details.
20 # You should have received a copy of the GNU General Public License
21 # along with this program; if not, write the Free Software Foundation,
22 # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 #-----------------------------------------------------------------------
27 seqres=$RESULT_DIR/$seq
28 echo "QA output created by $seq"
31 status=1 # failure is the default!
32 trap "_cleanup; exit \$status" 0 1 2 3 15
37 rm -fr $send_files_dir
41 # get standard environment, filters and checks
45 # real QA test starts here
51 send_files_dir=$TEST_DIR/btrfs-test-$seq
54 rm -fr $send_files_dir
57 _scratch_mkfs >>$seqres.full 2>&1
61 $XFS_IO_PROG -f -c "pwrite -S 0xaa 0K 32K" $SCRATCH_MNT/foo | _filter_xfs_io
63 # Create the first snapshot.
64 _run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/snap1
66 # Modify our file and create the second snapshot, used later for an incremental
68 $XFS_IO_PROG -c "pwrite -S 0xbb 4K 4K" $SCRATCH_MNT/foo | _filter_xfs_io
70 _run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/snap2
72 echo "File digests in the first filesystem:"
73 md5sum $SCRATCH_MNT/snap1/foo | _filter_scratch
74 md5sum $SCRATCH_MNT/snap2/foo | _filter_scratch
76 # Save send streams for the snapshots. For the first one we use a full send
77 # operation and the for the second snapshot we use an incremental send.
78 _run_btrfs_util_prog send $SCRATCH_MNT/snap1 -f $send_files_dir/1.snap
79 _run_btrfs_util_prog send -p $SCRATCH_MNT/snap1 $SCRATCH_MNT/snap2 \
80 -f $send_files_dir/2.snap
82 # Create a new filesystem and receive the snapshots.
84 _scratch_mkfs >>$seqres.full 2>&1
87 _run_btrfs_util_prog receive $SCRATCH_MNT -vv -f $send_files_dir/1.snap
88 _run_btrfs_util_prog receive $SCRATCH_MNT -vv -f $send_files_dir/2.snap
90 echo "File digests in the second filesystem:"
91 # Must match the digests we got in the first filesystem.
92 md5sum $SCRATCH_MNT/snap1/foo | _filter_scratch
93 md5sum $SCRATCH_MNT/snap2/foo | _filter_scratch
95 # Call sync to flush all delalloc data that the receiver processes created.
96 # Although 'btrfs receive' at the end calls a btrfs specific ioctl to change
97 # the snapshot from RW mode to RO mode, which commits the current btrfs
98 # transaction, the dealalloc data is not flushed, as the transaction commit
99 # intentionally does not do it unless the fs is mounted with '-o flushoncommit'.
100 # This is a detail that should probably be addressed either in the btrfs ioctls
101 # called by 'btrfs receive' or in the tools - our test has a different purpose,
102 # so we get around this by calling 'sync' to make sure all delalloc data is
103 # durably persisted and the respective file extent items are added to the
107 # Now create send streams for the snapshots from this new filesystem. For the
108 # first snapshot we do a full send while for the second snapshot we do an
110 _run_btrfs_util_prog send $SCRATCH_MNT/snap1 -f $send_files_dir/1_2.snap
111 _run_btrfs_util_prog send -p $SCRATCH_MNT/snap1 $SCRATCH_MNT/snap2 \
112 -f $send_files_dir/2_2.snap
114 # Create a new filesystem and receive the send streams we just created from the
115 # second filesystem. This worked until the linux kernel 4.2, where a regression
116 # was introduced. The problem was that the send stream included an incorrect
117 # value for the uuid field, which matched a snapshot's uuid (which is different
118 # on each filesystem) instead of the snapshot's received_uuid value (which is
119 # preserved across different filesystems).
121 _scratch_mkfs >>$seqres.full 2>&1
124 _run_btrfs_util_prog receive $SCRATCH_MNT -vv -f $send_files_dir/1_2.snap
125 _run_btrfs_util_prog receive $SCRATCH_MNT -vv -f $send_files_dir/2_2.snap
127 echo "File digests in the third filesystem:"
128 # Must match the digests we got in the first and second filesystems.
129 md5sum $SCRATCH_MNT/snap1/foo | _filter_scratch
130 md5sum $SCRATCH_MNT/snap2/foo | _filter_scratch