mirror of
https://github.com/linux-apfs/apfstests.git
synced 2026-05-01 15:01:44 -07:00
Darrick J. Wong
0f58b106e2
The setup code in this regression test case tries to figure out if certain features known to be incompatible with realtime are known to mkfs, and if so, to forcibly disable them. Unfortunately, the reflink feature detection logic here is broken, because we have no way of distinguishing between the helper function _scratch_mkfs_xfs_supported returning nonzero because reflink isn't compatible with mkfs's defaults (e.g. your mkfs has rmapbt=1 by default) vs. reflink isn't recognized at all vs. something else broke. However, we can grep the mkfs output to look for reflink support, and if we find it then we disable it. That's fine for this test, since on XFS it's trying to set up the exact conditions to test a known bug. Second, rmapbt isn't currently compatible with realtime either, so we need to detect and mask that off too. Third, the test only needs to perform this feature detection if the test runner didn't set SCRATCH_RTDEV, because we require that if the runner configured SCRATCH_RTDEV, they also set MKFS_OPTIONS appropriately. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Eryu Guan <guaneryu@gmail.com> Signed-off-by: Eryu Guan <guaneryu@gmail.com>
131 lines
3.8 KiB
Bash
Executable File
131 lines
3.8 KiB
Bash
Executable File
#! /bin/bash
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# SPDX-License-Identifier: GPL-2.0
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# Copyright (c) 2019 Facebook. All Rights Reserved.
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#
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# FS QA Test 590
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#
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# Test commit 0c4da70c83d4 ("xfs: fix realtime file data space leak") and
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# 69ffe5960df1 ("xfs: don't check for AG deadlock for realtime files in
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# bunmapi"). On XFS without the fixes, truncate will hang forever. On other
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# filesystems, this just tests writing into big fallocates.
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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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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 $tmp.*
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test -n "$loop" && _destroy_loop_device "$loop"
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rm -f "$TEST_DIR/$seq"
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}
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. ./common/rc
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. ./common/filter
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rm -f $seqres.full
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_supported_fs generic
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_supported_os Linux
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_require_scratch_nocheck
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_require_xfs_io_command "falloc"
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maxextlen=$((0x1fffff))
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bs=4096
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rextsize=4
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filesz=$(((maxextlen + 1) * bs))
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must_disable_feature() {
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local feat="$1"
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# If mkfs doesn't know about the feature, we don't need to disable it
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$MKFS_XFS_PROG --help 2>&1 | grep -q "${feat}=0" || return 1
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# If turning the feature on works, we don't need to disable it
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_scratch_mkfs_xfs_supported -m "${feat}=1" "${disabled_features[@]}" \
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> /dev/null 2>&1 && return 1
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# Otherwise mkfs knows of the feature and formatting with it failed,
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# so we do need to mask it.
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return 0
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}
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extra_options=""
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# If we're testing XFS, set up the realtime device to reproduce the bug.
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if [[ $FSTYP = xfs ]]; then
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# If we don't have a realtime device, set up a loop device on the test
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# filesystem.
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if [[ $USE_EXTERNAL != yes || -z $SCRATCH_RTDEV ]]; then
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_require_test
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loopsz="$((filesz + (1 << 26)))"
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_require_fs_space "$TEST_DIR" $((loopsz / 1024))
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$XFS_IO_PROG -c "truncate $loopsz" -f "$TEST_DIR/$seq"
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loop="$(_create_loop_device "$TEST_DIR/$seq")"
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USE_EXTERNAL=yes
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SCRATCH_RTDEV="$loop"
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disabled_features=()
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# disable reflink if not supported by realtime devices
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must_disable_feature reflink &&
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disabled_features=(-m reflink=0)
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# disable rmap if not supported by realtime devices
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must_disable_feature rmapbt &&
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disabled_features+=(-m rmapbt=0)
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fi
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extra_options="$extra_options -r extsize=$((bs * rextsize))"
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extra_options="$extra_options -d agsize=$(((maxextlen + 1) * bs / 2)),rtinherit=1"
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_scratch_mkfs $extra_options "${disabled_features[@]}" >>$seqres.full 2>&1
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_try_scratch_mount >>$seqres.full 2>&1 || \
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_notrun "mount failed, kernel doesn't support realtime?"
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_scratch_unmount
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else
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_scratch_mkfs $extra_options >>$seqres.full 2>&1
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fi
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_scratch_mount
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_require_fs_space "$SCRATCH_MNT" $((filesz / 1024))
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# Allocate maxextlen + 1 blocks. As long as the allocator does something sane,
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# we should end up with two extents that look something like:
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#
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# u3.bmx[0-1] = [startoff,startblock,blockcount,extentflag]
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# 0:[0,0,2097148,1]
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# 1:[2097148,2097148,4,1]
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#
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# Extent 0 has blockcount = ALIGN_DOWN(maxextlen, rextsize). Extent 1 is
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# adjacent and has blockcount = rextsize. Both are unwritten.
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$XFS_IO_PROG -c "falloc 0 $filesz" -c fsync -f "$SCRATCH_MNT/file"
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# Write extent 0 + one block of extent 1. Our extents should end up like so:
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#
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# u3.bmx[0-1] = [startoff,startblock,blockcount,extentflag]
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# 0:[0,0,2097149,0]
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# 1:[2097149,2097149,3,1]
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#
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# Extent 0 is written and has blockcount = ALIGN_DOWN(maxextlen, rextsize) + 1,
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# Extent 1 is adjacent, unwritten, and has blockcount = rextsize - 1 and
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# startblock % rextsize = 1.
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#
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# The -b is just to speed things up (doing GBs of I/O in 4k chunks kind of
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# sucks).
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$XFS_IO_PROG -c "pwrite -b 1M -W 0 $(((maxextlen + 2 - rextsize) * bs))" \
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"$SCRATCH_MNT/file" >> "$seqres.full"
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# Truncate the extents.
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$XFS_IO_PROG -c "truncate 0" -c fsync "$SCRATCH_MNT/file"
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# We need to do this before the loop device gets torn down.
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_scratch_unmount
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_check_scratch_fs
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echo "Silence is golden"
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status=0
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exit
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