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Darrick J. Wong
45b9734b98
_scratch_metadump is really an xfs-specific dump helper, so move it to common/xfs, add 'xfs' to the name, and convert all users. Signed-off-by: Darrick J. Wong <djwong@kernel.org>
103 lines
3.1 KiB
Bash
Executable File
103 lines
3.1 KiB
Bash
Executable File
#! /bin/bash
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# SPDX-License-Identifier: GPL-2.0
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# Copyright (c) 2017, Oracle and/or its affiliates. All Rights Reserved.
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#
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# FS QA Test No. 432
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#
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# Ensure that metadump copies large directory extents
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#
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# Metadump helpfully discards directory (and xattr) extents that are
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# longer than 1000 blocks. This is a little silly since a hardlink farm
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# can easily create such a monster.
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#
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# Now that we've upped metadump's default too-long-extent discard
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# threshold to 2^21 blocks, make sure we never do that again.
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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".* $metadump_file $metadump_img
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}
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# get standard environment, filters and checks
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. ./common/rc
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. ./common/filter
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# real QA test starts here
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_supported_fs xfs
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_require_scratch
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rm -f "$seqres.full"
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echo "Format and mount"
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# We need to create a directory with a huuuge extent record. Normally
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# a rapidly expanding directory gets its blocks allocated in lockstep --
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# physically we end up writing (a couple of dir data blocks) followed by
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# (a da btree block) over and over.
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#
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# Therefore, we crank the directory block size up to maximum and the
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# filesystem down to minimum so that we have to allocate 64 blocks at
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# a time, trying to end up with the result that we have > 1000 blocks
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# allocated in a single extent.
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#
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# In theory the math works out here -- ~65500 bytes for a da leaf block /
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# 8 bytes per da leaf entry == ~8187 hash entries for a da node. 65500
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# bytes for a dir data block / 264 bytes per dirent == ~248 dirents per
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# block. 8187 hashes/dablk / 248 dirents/dirblock = ~33 dirblocks per
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# dablock. 33 dirblocks * 64k mean that we can expand a directory by
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# 2112k before we have to allocate another da btree block.
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_scratch_mkfs -b size=1k -n size=64k > "$seqres.full" 2>&1
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_scratch_mount >> "$seqres.full" 2>&1
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metadump_file="$TEST_DIR/meta-$seq"
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metadump_img="$TEST_DIR/img-$seq"
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rm -f $metadump_file $metadump_img
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testdir="$SCRATCH_MNT/test-$seq"
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max_fname_len=255
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blksz=$(_get_block_size $SCRATCH_MNT)
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# Try to create a directory w/ extents
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blocks=1050
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names=$((blocks * (blksz / max_fname_len)))
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echo "Create huge dir"
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mkdir -p $testdir
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touch $SCRATCH_MNT/a
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seq 0 $names | while read f; do
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name="$testdir/$(printf "%0${max_fname_len}d" $f)"
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ln $SCRATCH_MNT/a $name
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done
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dir_inum=$(stat -c %i $testdir)
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echo "Check for > 1000 block extent?"
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_scratch_unmount
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check_for_long_extent() {
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inum=$1
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_scratch_xfs_db -x -c "inode $dir_inum" -c bmap | \
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sed -e 's/^.*count \([0-9]*\) flag.*$/\1/g' | \
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awk '{if ($1 > 1000) { printf("yes, %d\n", $1); } }'
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}
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extlen="$(check_for_long_extent $dir_inum)"
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echo "qualifying extent: $extlen blocks" >> $seqres.full
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test -n "$extlen" || _notrun "could not create dir extent > 1000 blocks"
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echo "Try to metadump"
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_scratch_xfs_metadump $metadump_file -w
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xfs_mdrestore $metadump_file $metadump_img
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echo "Check restored metadump image"
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$XFS_REPAIR_PROG -n $metadump_img >> $seqres.full 2>&1
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# success, all done
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status=0
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exit
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