mirror of
https://github.com/linux-apfs/apfstests.git
synced 2026-05-01 15:01:44 -07:00
Darrick J. Wong
a860a167d8
fstests only supports Linux, so get rid of this unnecessary predicate. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Eryu Guan <guaneryu@gmail.com>
153 lines
4.5 KiB
Bash
Executable File
153 lines
4.5 KiB
Bash
Executable File
#! /bin/bash
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# SPDX-License-Identifier: GPL-2.0
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# Copyright (C) 2019 SUSE Linux Products GmbH. All Rights Reserved.
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#
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# FS QA Test 199
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#
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# Test if btrfs discard mount option is trimming adjacent extents across
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# block groups boundary.
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# The test case uses loopback device and file used space to detect trimmed
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# bytes.
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#
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# There is a long existing bug that btrfs doesn't discard all space for
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# above mentioned case.
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#
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# The fix is: "btrfs: extent-tree: Ensure we trim ranges across block group
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# boundary"
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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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umount $loop_mnt &> /dev/null
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_destroy_loop_device $loop_dev &> /dev/null
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rm -rf $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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# Modify as appropriate.
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_supported_fs btrfs
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_require_loop
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_require_xfs_io_command "fiemap"
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# We need less than 2G data write, consider it 2G and double it just in case
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_require_scratch_size $((4 * 1024 * 1024))
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loop_file="$SCRATCH_MNT/image"
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# The margin when checking trimmed size.
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#
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# The margin is for tree blocks, calculated by
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# 3 * max_tree_block_size
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# | |- 64K
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# |- 3 trees get modified (root tree, extent tree, fs tree)
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#
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# In reality, there should be no margin at all due to the mount options.
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# But who knows what will happen in later kernels.
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margin_kb=$(( 3 * 64 ))
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trimmed_kb=$(( 768 * 1024 )) # 768M
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_scratch_mkfs >> $seqres.full
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_scratch_mount
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# Create a sparse file as the loopback target.
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# 10G size makes sure we have 1G chunk size.
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truncate -s 10G "$loop_file"
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_mkfs_dev -d SINGLE "$loop_file"
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loop_dev=$(_create_loop_device "$loop_file")
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loop_mnt=$tmp/loop_mnt
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mkdir -p $loop_mnt
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# - nospace_cache
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# Since v1 cache using DATA space, it can break data extent bytenr
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# continuousness.
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# - nodatasum
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# As there will be 1.5G data write, generating 1.5M csum.
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# Disabling datasum could reduce the margin caused by metadata to minimal
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# - discard
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# What we're testing
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_mount -o nospace_cache,nodatasum,discard $loop_dev $loop_mnt
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# Craft the following extent layout:
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# | BG1 | BG2 | BG3 |
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# Bytenr: X-8M X X+512M X+1G X+1G+128M
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# |//////|//////| |//|
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# V V V V
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# | | | |- file 'tail_padding'
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# | | |- file 'cross_boundary'
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# | |- file 'lead_padding2'
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# |- file 'lead_padding1'
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# So that all extents of file 'cross_boundary' are all adjacent and crosses the
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# boundary of BG1 and BG2
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# File 'lead_padding1' and 'lead_padding2' are all paddings to fill the
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# leading gap.
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# File 'tail_padding' is to ensure after deleting file 'cross_boundary' we still
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# have used extent in BG3, to prevent trimming the whole BG3.
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# And since BG1 needs exactly 8M to fill, we need to sync write to ensure
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# the write sequence.
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_pwrite_byte 0xcd 0 8M $loop_mnt/lead_padding1 > /dev/null
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sync
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_pwrite_byte 0xcd 0 512M $loop_mnt/lead_padding2 > /dev/null
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sync
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_pwrite_byte 0xcd 0 $(($trimmed_kb * 1024)) $loop_mnt/cross_boundary \
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> /dev/null
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sync
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_pwrite_byte 0xcd 0 1M $loop_mnt/tail_padding > /dev/null
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sync
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$XFS_IO_PROG -c "fiemap" $loop_mnt/cross_boundary >> $seqres.full
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# Ensure all extent are continuous
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# Btrfs fiemap will merge continuous results, so the output should be only
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# 2 lines, 1 line for filename, 1 line for a large merged fiemap result.
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if [ $($XFS_IO_PROG -c "fiemap" $loop_mnt/cross_boundary | wc -l) -ne 2 ]; then
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_notrun "Non-continuous extent bytenr detected"
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fi
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size1_kb=$(du $loop_file| cut -f1)
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# Delete the file 'cross_boundary'.
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# This will delete $trimmed_kb data extents across the chunk boundary.
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rm -f $loop_mnt/cross_boundary
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# sync so btrfs will commit transaction and trim the freed extents
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sync
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size2_kb=$(du $loop_file | cut -f1)
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echo "loopback file size before discard: $size1_kb KiB" >> $seqres.full
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echo "loopback file size after discard: $size2_kb KiB" >> $seqres.full
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echo "Expect trimmed size: $trimmed_kb KiB" >> $seqres.full
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echo "Have trimmed size: $(($size1_kb - $size2_kb)) KiB" >> $seqres.full
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if [ $(($size2_kb+ $trimmed_kb)) -gt $(($size1_kb + $margin_kb)) -o \
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$(($size2_kb+ $trimmed_kb)) -lt $(($size1_kb - $margin_kb)) ]; then
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echo "Btrfs doesn't trim the range correctly"
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fi
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echo "Silence is golden"
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# success, all done
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status=0
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exit
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