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https://github.com/linux-apfs/apfstests.git
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Filipe Manana
a022d3128a
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> Signed-off-by: Dave Chinner <david@fromorbit.com>
81 lines
2.5 KiB
Bash
Executable File
81 lines
2.5 KiB
Bash
Executable File
#! /bin/bash
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# FSQA Test No. 096
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#
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# Test that we can not clone an inline extent into a non-zero file offset.
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#
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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 -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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_need_to_be_root
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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_cloner
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rm -f $seqres.full
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_scratch_mkfs >>$seqres.full 2>&1
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_scratch_mount
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# Create our test files. File foo has the same 2K of data at offset 4K as file
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# bar has at its offset 0.
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$XFS_IO_PROG -f -s -c "pwrite -S 0xaa 0 4K" \
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-c "pwrite -S 0xbb 4k 2K" \
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-c "pwrite -S 0xcc 8K 4K" \
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$SCRATCH_MNT/foo | _filter_xfs_io
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# File bar consists of a single inline extent (2K size).
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$XFS_IO_PROG -f -s -c "pwrite -S 0xbb 0 2K" \
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$SCRATCH_MNT/bar | _filter_xfs_io
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# Now call the clone ioctl to clone the extent of file bar into file foo at its
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# offset 4K. This made file foo have an inline extent at offset 4K, something
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# which the btrfs code can not deal with in future IO operations because all
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# inline extents are supposed to start at an offset of 0, resulting in all sorts
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# of chaos.
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# So here we validate that the clone ioctl returns an EOPNOTSUPP, which is what
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# it returns for other cases dealing with inlined extents.
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$CLONER_PROG -s 0 -d $((4 * 1024)) -l $((2 * 1024)) \
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$SCRATCH_MNT/bar $SCRATCH_MNT/foo
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# Because of the inline extent at offset 4K, the following write made the kernel
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# crash with a BUG_ON().
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$XFS_IO_PROG -c "pwrite -S 0xdd 6K 2K" $SCRATCH_MNT/foo | _filter_xfs_io
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status=0
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exit
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