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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2015 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test No. btrfs/083
#
# 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
#
. ./common/preamble
_begin_fstest auto quick send
# Override the default cleanup function.
_cleanup()
{
rm -fr $send_files_dir
rm -f $tmp.*
}
. ./common/filter
_supported_fs btrfs
_require_scratch
_require_fssum
send_files_dir=$TEST_DIR/btrfs-test-$seq
rm -fr $send_files_dir
mkdir $send_files_dir
_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount
mkdir $SCRATCH_MNT/a
mkdir $SCRATCH_MNT/b
mkdir $SCRATCH_MNT/c
touch $SCRATCH_MNT/a/file
mkdir $SCRATCH_MNT/d
mkdir $SCRATCH_MNT/e
touch $SCRATCH_MNT/e/file2
mkdir $SCRATCH_MNT/f
# Filesystem looks like:
#
# . (ino 256)
# |---- a/ (ino 257)
# | |---- file (ino 260)
# |
# |---- b/ (ino 258)
# |---- c/ (ino 259)
# |---- d/ (ino 261)
# |---- e/ (ino 262)
# | |--- file2 (ino 263)
# |
# |---- f/ (ino 264)
#
_btrfs subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/mysnap1
# Now make inode 257 a child of inode 259 and rename inode 258 to the name that
# inode 257 had before. When the incremental send processes inode 257, it can't
# do the rename immediately because inode 259 must be renamed first, so inode's
# 257 rename is delayed and happens after the rename for inode 259 is done.
# Since send processes inodes by ascending order of their number, inode 258
# can't be renamed before inode 257 is renamed and therefore must be delayed
# as well. So the send stream must issue rename commands in the following order:
#
# 1 - rename inode 259 ('c' -> 'x')
# 2 - rename inode 257 ('a' -> 'x/y')
# 3 - rename inode 258 ('b' -> 'a')
#
# Before the fix mentioned above, the send stream attempted to rename inode 258
# before inode 257 was renamed, resulting in a client error mentioning
# 'directory not empty'.
#
# Same logic applies to 'd', 'e' and 'f', but the difference is that in the
# second snapshot 'e' is associated to an inode with a lower inode number than
# in the first snapshot.
#
mv $SCRATCH_MNT/c $SCRATCH_MNT/x
mv $SCRATCH_MNT/a $SCRATCH_MNT/x/y
mv $SCRATCH_MNT/b $SCRATCH_MNT/a
mv $SCRATCH_MNT/f $SCRATCH_MNT/f2
mv $SCRATCH_MNT/e $SCRATCH_MNT/f2/e2
mv $SCRATCH_MNT/d $SCRATCH_MNT/e
# Filesystem now looks like:
#
#
# . (ino 256)
# |---- a/ (ino 258)
# |---- x/ (ino 259)
# | |---- y/ (ino 257)
# | |----- file (ino 260)
# |
# |---- e/ (ino 261)
# |---- f2/ (ino 264)
# | |----- e2/ (ino 262)
# |---- file2 (ino 263)
_btrfs subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/mysnap2
run_check $FSSUM_PROG -A -f -w $send_files_dir/1.fssum $SCRATCH_MNT/mysnap1
run_check $FSSUM_PROG -A -f -w $send_files_dir/2.fssum \
-x $SCRATCH_MNT/mysnap2/mysnap1 $SCRATCH_MNT/mysnap2
_btrfs send -f $send_files_dir/1.snap $SCRATCH_MNT/mysnap1
_btrfs send -p $SCRATCH_MNT/mysnap1 -f $send_files_dir/2.snap \
$SCRATCH_MNT/mysnap2
# Now recreate the filesystem by receiving both send streams and verify we get
# the same content that the original filesystem had.
_scratch_unmount
_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount
_btrfs receive -f $send_files_dir/1.snap $SCRATCH_MNT
run_check $FSSUM_PROG -r $send_files_dir/1.fssum $SCRATCH_MNT/mysnap1
_btrfs receive -f $send_files_dir/2.snap $SCRATCH_MNT
run_check $FSSUM_PROG -r $send_files_dir/2.fssum $SCRATCH_MNT/mysnap2
echo "Silence is golden"
status=0
exit
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