Regression test for btrfs' incremental send feature: 1) Create several nested directories; 2) Create a read only snapshot; 3) Change the parentship of some of the deepest directories in a reverse way, so that parents become children and children become parents; 4) Create another read only snapshot and use it for an incremental send relative to the first snapshot. At step 4 btrfs' send entered an infinite loop, increasing the memory it used while building path strings until a krealloc was unable to allocate more memory, which caused a warning dump in dmesg. The following linux kernel patch fixes this issue. Btrfs: fix infinite path build loops in incremental send (https://patchwork.kernel.org/patch/3521191/) Signed-off-by: Filipe David Borba Manana <fdmanana@xxxxxxxxx> --- tests/btrfs/030 | 140 +++++++++++++++++++++++++++++++++++++++++++++++++++ tests/btrfs/030.out | 9 ++++ tests/btrfs/group | 1 + 3 files changed, 150 insertions(+) create mode 100755 tests/btrfs/030 create mode 100644 tests/btrfs/030.out diff --git a/tests/btrfs/030 b/tests/btrfs/030 new file mode 100755 index 0000000..a492877 --- /dev/null +++ b/tests/btrfs/030 @@ -0,0 +1,140 @@ +#! /bin/bash +# FS QA Test No. btrfs/030 +# +# Regression test for btrfs' incremental send feature: +# +# 1) Create several nested directories; +# 2) Create a read only snapshot; +# 3) Change the parentship of some of the deepest directories in a reverse +# way, so that parents become children and children become parents; +# 4) Create another read only snapshot and use it for an incremental send +# relative to the first snapshot. +# +# At step 4 btrfs' send entered an infinite loop, increasing the memory it +# used while building path strings until a krealloc was unable to allocate +# more memory, which caused a warning dump in dmesg. +# +#----------------------------------------------------------------------- +# Copyright (c) 2014 Filipe Manana. All Rights Reserved. +# +# 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" + +here=`pwd` +tmp=`mktemp -d` +status=1 # failure is the default! +trap "_cleanup; exit \$status" 0 1 2 3 15 + +_cleanup() +{ + rm -fr $tmp +} + +# get standard environment, filters and checks +. ./common/rc +. ./common/filter + +# real QA test starts here +_supported_fs btrfs +_supported_os Linux +_require_scratch +_need_to_be_root + +FSSUM_PROG=$here/src/fssum +[ -x $FSSUM_PROG ] || _notrun "fssum not built" + +rm -f $seqres.full + +_scratch_mkfs >/dev/null 2>&1 +_scratch_mount + + +mkdir -p $SCRATCH_MNT/a/b/c +echo "hello" > $SCRATCH_MNT/a/b/c/file.txt +mkdir $SCRATCH_MNT/a/b/c/d +mkdir $SCRATCH_MNT/a/b/c2 +mkdir -p $SCRATCH_MNT/a/b/c3/x/y + +# Directory tree looks like: +# +# . (ino 256) +# |-- a/ (ino 257) +# |-- b/ (ino 258) +# |-- c/ (ino 259) +# | |-- file.txt (ino 260) +# | |-- d/ (ino 261) +# | +# |-- c2/ (ino 262) +# | +# |-- c3/ (ino 263) +# |-- x/ (ino 264) +# |-- y/ (ino 265) + +$BTRFS_UTIL_PROG subvol snapshot -r $SCRATCH_MNT $SCRATCH_MNT/mysnap1 | \ + _filter_scratch + +echo " world" >> $SCRATCH_MNT/a/b/c/file.txt +mv $SCRATCH_MNT/a/b/c/d $SCRATCH_MNT/a/b/c2/d2 +mv $SCRATCH_MNT/a/b/c $SCRATCH_MNT/a/b/c2/d2/cc +mv $SCRATCH_MNT/a/b/c3/x/y $SCRATCH_MNT/a/b/c2/y2 +mv $SCRATCH_MNT/a/b/c3/x $SCRATCH_MNT/a/b/c2/y2/x2 +mv $SCRATCH_MNT/a/b/c3 $SCRATCH_MNT/a/b/c2/y2/x2/Z +ln $SCRATCH_MNT/a/b/c2/d2/cc/file.txt $SCRATCH_MNT/a/b/c2/y2/x2/Z/file_link.txt +mv $SCRATCH_MNT/a/b/c2/d2/cc/file.txt $SCRATCH_MNT/a/b/c2/y2/x2 + +# Directory tree now looks like: +# +# . (ino 256) +# |-- a/ (ino 257) +# |-- b/ (ino 258) +# |-- c2/ (ino 262) +# |-- d2/ (ino 261) +# | |-- cc/ (ino 259) +# | |-- file.txt (ino 260) +# |-- y2/ (ino 265) +# |-- x2/ (ino 264) +# |-- Z/ (ino 263) +# |-- file_link.txt + +$BTRFS_UTIL_PROG subvol snapshot -r $SCRATCH_MNT $SCRATCH_MNT/mysnap2 | \ + _filter_scratch + +$FSSUM_PROG -A -f -w $tmp/1.fssum $SCRATCH_MNT/mysnap1 +$FSSUM_PROG -A -f -w $tmp/2.fssum -x $SCRATCH_MNT/mysnap2/mysnap1 \ + $SCRATCH_MNT/mysnap2 + +$BTRFS_UTIL_PROG send $SCRATCH_MNT/mysnap1 -f $tmp/1.snap 2>&1 | _filter_scratch +$BTRFS_UTIL_PROG send -p $SCRATCH_MNT/mysnap1 $SCRATCH_MNT/mysnap2 \ + -f $tmp/2.snap 2>&1 | _filter_scratch + +_scratch_unmount +_check_btrfs_filesystem $SCRATCH_DEV +_scratch_mkfs >/dev/null 2>&1 +_scratch_mount + +$BTRFS_UTIL_PROG receive $SCRATCH_MNT -f $tmp/1.snap +$FSSUM_PROG -r $tmp/1.fssum $SCRATCH_MNT/mysnap1 +$BTRFS_UTIL_PROG receive $SCRATCH_MNT -f $tmp/2.snap +$FSSUM_PROG -r $tmp/2.fssum $SCRATCH_MNT/mysnap2 + +_scratch_unmount +_check_btrfs_filesystem $SCRATCH_DEV + +status=0 +exit diff --git a/tests/btrfs/030.out b/tests/btrfs/030.out new file mode 100644 index 0000000..2999f8c --- /dev/null +++ b/tests/btrfs/030.out @@ -0,0 +1,9 @@ +QA output created by 030 +Create a readonly snapshot of 'SCRATCH_MNT' in 'SCRATCH_MNT/mysnap1' +Create a readonly snapshot of 'SCRATCH_MNT' in 'SCRATCH_MNT/mysnap2' +At subvol SCRATCH_MNT/mysnap1 +At subvol SCRATCH_MNT/mysnap2 +At subvol mysnap1 +OK +At snapshot mysnap2 +OK diff --git a/tests/btrfs/group b/tests/btrfs/group index 8eb8c4f..3f61799 100644 --- a/tests/btrfs/group +++ b/tests/btrfs/group @@ -32,3 +32,4 @@ 027 auto quick 028 auto quick 029 auto quick +030 auto quick -- 1.7.9.5 _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
