| Message ID | 1436888234-16254-1-git-send-email-fdmanana@kernel.org (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
On Tue, Jul 14, 2015 at 04:37:14PM +0100, fdmanana@kernel.org wrote: > From: Filipe Manana <fdmanana@suse.com> > > This tests that we can not clone an inline extent into a non-zero file > offset. Inline extents at non-zero offsets is something btrfs is not > prepared for and results in all sorts of corruption and crashes on > future IO operations, such as the following BUG_ON() triggered by the > last write operation done by this test: > > [152154.035903] ------------[ cut here ]------------ > [152154.036424] kernel BUG at mm/page-writeback.c:2286! > [152154.036424] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC > (...) > [152154.036424] RIP: 0010:[<ffffffff8111a9d5>] [<ffffffff8111a9d5>] clear_page_dirty_for_io+0x1e/0x90 > (...) > [152154.036424] Call Trace: > [152154.036424] [<ffffffffa04e97c1>] lock_and_cleanup_extent_if_need+0x147/0x18d [btrfs] > [152154.036424] [<ffffffffa04ea82c>] __btrfs_buffered_write+0x245/0x4c8 [btrfs] > [152154.036424] [<ffffffffa04ed14b>] ? btrfs_file_write_iter+0x150/0x3e0 [btrfs] > [152154.036424] [<ffffffffa04ed15a>] ? btrfs_file_write_iter+0x15f/0x3e0 [btrfs] > [152154.036424] [<ffffffffa04ed2c7>] btrfs_file_write_iter+0x2cc/0x3e0 [btrfs] > [152154.036424] [<ffffffff81165a4a>] __vfs_write+0x7c/0xa5 > [152154.036424] [<ffffffff81165f89>] vfs_write+0xa0/0xe4 > [152154.036424] [<ffffffff81166855>] SyS_pwrite64+0x64/0x82 > [152154.036424] [<ffffffff81465197>] system_call_fastpath+0x12/0x6f > (...) > [152154.242621] ---[ end trace e3d3376b23a57041 ]--- > > This issue is addressed by the following linux kernel patch for btrfs: > "Btrfs: fix file corruption after cloning inline extents". > > Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: Omar Sandoval <osandov@fb.com> Tested that it passes on 4.2-rc3 and fails with the specified commit reverted. > --- > tests/btrfs/096 | 80 +++++++++++++++++++++++++++++++++++++++++++++++++++++ > tests/btrfs/096.out | 12 ++++++++ > tests/btrfs/group | 1 + > 3 files changed, 93 insertions(+) > create mode 100755 tests/btrfs/096 > create mode 100644 tests/btrfs/096.out > > diff --git a/tests/btrfs/096 b/tests/btrfs/096 > new file mode 100755 > index 0000000..f5b3a7f > --- /dev/null > +++ b/tests/btrfs/096 > @@ -0,0 +1,80 @@ > +#! /bin/bash > +# FSQA Test No. 096 > +# > +# Test that we can not clone an inline extent into a non-zero file offset. > +# > +#----------------------------------------------------------------------- > +# > +# Copyright (C) 2015 SUSE Linux Products GmbH. All Rights Reserved. > +# Author: Filipe Manana <fdmanana@suse.com> > +# > +# 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() > +{ > + rm -f $tmp.* > +} > + > +# get standard environment, filters and checks > +. ./common/rc > +. ./common/filter > + > +# real QA test starts here > +_need_to_be_root > +_supported_fs btrfs > +_supported_os Linux > +_require_scratch > +_require_cloner > + > +rm -f $seqres.full > + > +_scratch_mkfs >>$seqres.full 2>&1 > +_scratch_mount > + > +# Create our test files. File foo has the same 2K of data at offset 4K as file > +# bar has at its offset 0. > +$XFS_IO_PROG -f -s -c "pwrite -S 0xaa 0 4K" \ > + -c "pwrite -S 0xbb 4k 2K" \ > + -c "pwrite -S 0xcc 8K 4K" \ > + $SCRATCH_MNT/foo | _filter_xfs_io > + > +# File bar consists of a single inline extent (2K size). > +$XFS_IO_PROG -f -s -c "pwrite -S 0xbb 0 2K" \ > + $SCRATCH_MNT/bar | _filter_xfs_io > + > +# Now call the clone ioctl to clone the extent of file bar into file foo at its > +# offset 4K. This made file foo have an inline extent at offset 4K, something > +# which the btrfs code can not deal with in future IO operations because all > +# inline extents are supposed to start at an offset of 0, resulting in all sorts > +# of chaos. > +# So here we validate that the clone ioctl returns an EOPNOTSUPP, which is what > +# it returns for other cases dealing with inlined extents. > +$CLONER_PROG -s 0 -d $((4 * 1024)) -l $((2 * 1024)) \ > + $SCRATCH_MNT/bar $SCRATCH_MNT/foo > + > +# Because of the inline extent at offset 4K, the following write made the kernel > +# crash with a BUG_ON(). > +$XFS_IO_PROG -c "pwrite -S 0xdd 6K 2K" $SCRATCH_MNT/foo | _filter_xfs_io > + > +status=0 > +exit > diff --git a/tests/btrfs/096.out b/tests/btrfs/096.out > new file mode 100644 > index 0000000..235198d > --- /dev/null > +++ b/tests/btrfs/096.out > @@ -0,0 +1,12 @@ > +QA output created by 096 > +wrote 4096/4096 bytes at offset 0 > +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) > +wrote 2048/2048 bytes at offset 4096 > +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) > +wrote 4096/4096 bytes at offset 8192 > +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) > +wrote 2048/2048 bytes at offset 0 > +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) > +clone failed: Operation not supported > +wrote 2048/2048 bytes at offset 6144 > +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) > diff --git a/tests/btrfs/group b/tests/btrfs/group > index 79feea9..6ff5f3d 100644 > --- a/tests/btrfs/group > +++ b/tests/btrfs/group > @@ -97,3 +97,4 @@ > 093 auto quick clone > 094 auto quick send > 095 auto quick metadata > +096 auto quick clone > -- > 2.1.3 > > -- > To unsubscribe from this list: send the line "unsubscribe fstests" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/tests/btrfs/096 b/tests/btrfs/096 new file mode 100755 index 0000000..f5b3a7f --- /dev/null +++ b/tests/btrfs/096 @@ -0,0 +1,80 @@ +#! /bin/bash +# FSQA Test No. 096 +# +# Test that we can not clone an inline extent into a non-zero file offset. +# +#----------------------------------------------------------------------- +# +# Copyright (C) 2015 SUSE Linux Products GmbH. All Rights Reserved. +# Author: Filipe Manana <fdmanana@suse.com> +# +# 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() +{ + rm -f $tmp.* +} + +# get standard environment, filters and checks +. ./common/rc +. ./common/filter + +# real QA test starts here +_need_to_be_root +_supported_fs btrfs +_supported_os Linux +_require_scratch +_require_cloner + +rm -f $seqres.full + +_scratch_mkfs >>$seqres.full 2>&1 +_scratch_mount + +# Create our test files. File foo has the same 2K of data at offset 4K as file +# bar has at its offset 0. +$XFS_IO_PROG -f -s -c "pwrite -S 0xaa 0 4K" \ + -c "pwrite -S 0xbb 4k 2K" \ + -c "pwrite -S 0xcc 8K 4K" \ + $SCRATCH_MNT/foo | _filter_xfs_io + +# File bar consists of a single inline extent (2K size). +$XFS_IO_PROG -f -s -c "pwrite -S 0xbb 0 2K" \ + $SCRATCH_MNT/bar | _filter_xfs_io + +# Now call the clone ioctl to clone the extent of file bar into file foo at its +# offset 4K. This made file foo have an inline extent at offset 4K, something +# which the btrfs code can not deal with in future IO operations because all +# inline extents are supposed to start at an offset of 0, resulting in all sorts +# of chaos. +# So here we validate that the clone ioctl returns an EOPNOTSUPP, which is what +# it returns for other cases dealing with inlined extents. +$CLONER_PROG -s 0 -d $((4 * 1024)) -l $((2 * 1024)) \ + $SCRATCH_MNT/bar $SCRATCH_MNT/foo + +# Because of the inline extent at offset 4K, the following write made the kernel +# crash with a BUG_ON(). +$XFS_IO_PROG -c "pwrite -S 0xdd 6K 2K" $SCRATCH_MNT/foo | _filter_xfs_io + +status=0 +exit diff --git a/tests/btrfs/096.out b/tests/btrfs/096.out new file mode 100644 index 0000000..235198d --- /dev/null +++ b/tests/btrfs/096.out @@ -0,0 +1,12 @@ +QA output created by 096 +wrote 4096/4096 bytes at offset 0 +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +wrote 2048/2048 bytes at offset 4096 +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +wrote 4096/4096 bytes at offset 8192 +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +wrote 2048/2048 bytes at offset 0 +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +clone failed: Operation not supported +wrote 2048/2048 bytes at offset 6144 +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) diff --git a/tests/btrfs/group b/tests/btrfs/group index 79feea9..6ff5f3d 100644 --- a/tests/btrfs/group +++ b/tests/btrfs/group @@ -97,3 +97,4 @@ 093 auto quick clone 094 auto quick send 095 auto quick metadata +096 auto quick clone