mirror of
https://github.com/linux-apfs/apfstests.git
synced 2026-05-01 15:01:44 -07:00
Dave Chinner
cf89aed924
Fully scripted conversion, see script in initial SPDX license commit message. Signed-off-by: Dave Chinner <dchinner@redhat.com>
121 lines
3.0 KiB
Bash
Executable File
121 lines
3.0 KiB
Bash
Executable File
#! /bin/bash
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# SPDX-License-Identifier: GPL-2.0
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# Copyright (c) 2017 Red Hat Inc., All Rights Reserved.
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#
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# FS QA Test 469
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#
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# Test that mmap read doesn't see non-zero data past EOF on truncate down.
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#
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# This is inspired by an XFS bug that truncate down fails to zero page cache
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# beyond new EOF and causes stale data written to disk unexpectedly and a
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# subsequent mmap reads and sees non-zeros post EOF.
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#
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# Patch "xfs: truncate pagecache before writeback in xfs_setattr_size()" fixed
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# the bug on XFS.
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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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here=`pwd`
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tmp=/tmp/$$
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file=$TEST_DIR/$seq.fsx
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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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cd /
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rm -f $file $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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# remove previous $seqres.full before test
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rm -f $seqres.full
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# real QA test starts here
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_supported_fs generic
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_supported_os Linux
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_require_test
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run_fsx()
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{
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$here/ltp/fsx $2 --replay-ops $1 $file 2>&1 | tee -a $seqres.full >$tmp.fsx
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if [ ${PIPESTATUS[0]} -ne 0 ]; then
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cat $tmp.fsx
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exit 1
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fi
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}
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# run fsx with and without fsync(2) after write to get more coverage
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test_fsx()
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{
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echo "fsx --replay-ops ${1#*.}" | tee -a $seqres.full
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run_fsx $1
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echo "fsx -y --replay-ops ${1#*.}" | tee -a $seqres.full
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run_fsx $1 -y
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}
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# simplified fsx operations that work on small & not blocksize-aligned offsets,
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# so filesystems with small block size could reproduce too
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cat >$tmp.fsxops.0 <<EOF
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# create file with unwritten extent, KEEP_SIZE flag is required, otherwise page
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# straddles new i_size in the writeback triggered by truncate, range [i_size,
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# page_boundary] will be zeroed there, and bug won't be reproduced
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fallocate 0x0 0x1000 0x0 keep_size
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# overwrite the unwritten extents with non-zeros, but extent will stay in
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# unwritten till I/O completion
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write 0x0 0x1000 0x0
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# truncate down the file, which should zero page cache beyong new EOF but a
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# buggy kernel won't
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truncate 0x0 0x10 0x1000
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# unmap the file and invalidate the pagecache of the block
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punch_hole 0x0 0x10 0x10
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# mmap reads the whole block from disk, and fsx will check page range beyond
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# EOF to make sure we only see zeros there
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mapread 0x0 0x10 0x10
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EOF
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# to get a bit more test coverage, try other operation combinations too
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# same as fsxops.0, but skip punch_hole to keep the pagecache before mapread
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cat >$tmp.fsxops.1 <<EOF
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fallocate 0x0 0x1000 0x0 keep_size
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write 0x0 0x1000 0x0
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truncate 0x0 0x10 0x1000
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mapread 0x0 0x10 0x10
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EOF
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# same as fsxops.0, but fallocate without KEEP_SIZE flag
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cat >$tmp.fsxops.2 <<EOF
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fallocate 0x0 0x1000 0x0
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write 0x0 0x1000 0x0
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truncate 0x0 0x10 0x1000
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punch_hole 0x0 0x10 0x10
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mapread 0x0 0x10 0x10
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EOF
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# this is from the original fsxops when bug was first hit
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cat >$tmp.fsxops.3 <<EOF
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fallocate 0x35870 0xa790 0x0 keep_size
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write 0x2aa50 0xc37f 0x0
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truncate 0x0 0x36dcd 0x36dcf
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zero_range 0x35849 0x1584 0x36dcd
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mapread 0x361c8 0xc05 0x36dcd
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EOF
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for i in 0 1 2 3; do
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test_fsx $tmp.fsxops.$i
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done
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# success, all done
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status=0
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exit
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