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btrfs: test incremental send with directory renames
Test for incremental send where the difference between the parent and child snapshots is that a directory A was renamed and a directory B was renamed to the name directory A had before (in the parent snapshot), but directory A's rename must happen before some other directory C is renamed. This issue was fixed by the following linux kernel btrfs patch: Btrfs: incremental send, don't rename a directory too soon Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: David Sterba <dsterba@suse.cz> Signed-off-by: Dave Chinner <david@fromorbit.com>
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Filipe Manana
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Dave Chinner
Dave Chinner
parent
672a9f0e12
commit
a752266d74
Executable
+159
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#! /bin/bash
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# FS QA Test No. btrfs/083
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#
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# Test for incremental send where the difference between the parent and child
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# snapshots is that a directory A was renamed and a directory B was renamed to
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# the name directory A had before (in the parent snapshot), but directory A's
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# rename must happen before some other directory C is renamed.
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#
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# This issue was fixed by the following linux kernel btrfs patch:
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#
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# Btrfs: incremental send, don't rename a directory too soon
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#
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#-----------------------------------------------------------------------
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# Copyright (C) 2015 SUSE Linux Products GmbH. All Rights Reserved.
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# Author: Filipe Manana <fdmanana@suse.com>
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it would be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write the Free Software Foundation,
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# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#-----------------------------------------------------------------------
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#
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seq=`basename $0`
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seqres=$RESULT_DIR/$seq
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echo "QA output created by $seq"
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tmp=/tmp/$$
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status=1 # failure is the default!
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trap "_cleanup; exit \$status" 0 1 2 3 15
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_cleanup()
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{
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rm -fr $send_files_dir
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rm -f $tmp.*
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}
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# get standard environment, filters and checks
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. ./common/rc
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. ./common/filter
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# real QA test starts here
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_supported_fs btrfs
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_supported_os Linux
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_require_scratch
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_require_fssum
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_need_to_be_root
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send_files_dir=$TEST_DIR/btrfs-test-$seq
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rm -f $seqres.full
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rm -fr $send_files_dir
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mkdir $send_files_dir
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_scratch_mkfs >>$seqres.full 2>&1
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_scratch_mount
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mkdir $SCRATCH_MNT/a
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mkdir $SCRATCH_MNT/b
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mkdir $SCRATCH_MNT/c
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touch $SCRATCH_MNT/a/file
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mkdir $SCRATCH_MNT/d
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mkdir $SCRATCH_MNT/e
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touch $SCRATCH_MNT/e/file2
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mkdir $SCRATCH_MNT/f
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# Filesystem looks like:
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#
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# . (ino 256)
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# |---- a/ (ino 257)
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# | |---- file (ino 260)
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# |
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# |---- b/ (ino 258)
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# |---- c/ (ino 259)
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# |---- d/ (ino 261)
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# |---- e/ (ino 262)
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# | |--- file2 (ino 263)
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# |
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# |---- f/ (ino 264)
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#
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_run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/mysnap1
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# Now make inode 257 a child of inode 259 and rename inode 258 to the name that
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# inode 257 had before. When the incremental send processes inode 257, it can't
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# do the rename immediately because inode 259 must be renamed first, so inode's
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# 257 rename is delayed and happens after the rename for inode 259 is done.
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# Since send processes inodes by ascending order of their number, inode 258
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# can't be renamed before inode 257 is renamed and therefore must be delayed
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# as well. So the send stream must issue rename commands in the following order:
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#
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# 1 - rename inode 259 ('c' -> 'x')
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# 2 - rename inode 257 ('a' -> 'x/y')
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# 3 - rename inode 258 ('b' -> 'a')
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#
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# Before the fix mentioned above, the send stream attempted to rename inode 258
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# before inode 257 was renamed, resulting in a client error mentioning
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# 'directory not empty'.
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#
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# Same logic applies to 'd', 'e' and 'f', but the difference is that in the
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# second snapshot 'e' is associated to an inode with a lower inode number than
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# in the first snapshot.
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#
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mv $SCRATCH_MNT/c $SCRATCH_MNT/x
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mv $SCRATCH_MNT/a $SCRATCH_MNT/x/y
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mv $SCRATCH_MNT/b $SCRATCH_MNT/a
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mv $SCRATCH_MNT/f $SCRATCH_MNT/f2
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mv $SCRATCH_MNT/e $SCRATCH_MNT/f2/e2
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mv $SCRATCH_MNT/d $SCRATCH_MNT/e
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# Filesystem now looks like:
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#
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#
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# . (ino 256)
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# |---- a/ (ino 258)
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# |---- x/ (ino 259)
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# | |---- y/ (ino 257)
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# | |----- file (ino 260)
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# |
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# |---- e/ (ino 261)
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# |---- f2/ (ino 264)
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# | |----- e2/ (ino 262)
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# |---- file2 (ino 263)
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_run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/mysnap2
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run_check $FSSUM_PROG -A -f -w $send_files_dir/1.fssum $SCRATCH_MNT/mysnap1
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run_check $FSSUM_PROG -A -f -w $send_files_dir/2.fssum \
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-x $SCRATCH_MNT/mysnap2/mysnap1 $SCRATCH_MNT/mysnap2
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_run_btrfs_util_prog send $SCRATCH_MNT/mysnap1 -f $send_files_dir/1.snap
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_run_btrfs_util_prog send -p $SCRATCH_MNT/mysnap1 $SCRATCH_MNT/mysnap2 \
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-f $send_files_dir/2.snap
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# Now recreate the filesystem by receiving both send streams and verify we get
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# the same content that the original filesystem had.
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_scratch_unmount
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_scratch_mkfs >>$seqres.full 2>&1
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_scratch_mount
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_run_btrfs_util_prog receive $SCRATCH_MNT -f $send_files_dir/1.snap
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run_check $FSSUM_PROG -r $send_files_dir/1.fssum $SCRATCH_MNT/mysnap1
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_run_btrfs_util_prog receive $SCRATCH_MNT -f $send_files_dir/2.snap
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run_check $FSSUM_PROG -r $send_files_dir/2.fssum $SCRATCH_MNT/mysnap2
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echo "Silence is golden"
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status=0
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exit
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@@ -0,0 +1,2 @@
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QA output created by 083
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Silence is golden
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@@ -85,3 +85,4 @@
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080 auto snapshot
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081 auto quick clone
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082 auto quick remount
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083 auto quick send
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