110 lines
3.4 KiB
Text
110 lines
3.4 KiB
Text
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#!/usr/bin/env bash
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# group: rw auto quick
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#
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# General test case for qcow2's image check
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#
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# Copyright (C) 2015 Red Hat, Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will 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, see <http://www.gnu.org/licenses/>.
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#
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# creator
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owner=hreitz@redhat.com
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seq="$(basename $0)"
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echo "QA output created by $seq"
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status=1 # failure is the default!
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_cleanup()
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{
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_cleanup_test_img
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}
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trap "_cleanup; exit \$status" 0 1 2 3 15
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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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# This tests qcow2-specific low-level functionality
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_supported_fmt qcow2
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_supported_proto file fuse
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_supported_os Linux
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# With an external data file, data clusters are not refcounted
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# (so qemu-img check would not do much);
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# we want to modify the refcounts, so we need them to have a specific
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# format (namely u16)
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_unsupported_imgopts data_file 'refcount_bits=\([^1]\|.\([^6]\|$\)\)'
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echo
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echo '=== Check on an image with a multiple of 2^32 clusters ==='
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echo
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_make_test_img -o "cluster_size=512" 512
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# Allocate L2 table
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$QEMU_IO -c 'write 0 512' "$TEST_IMG" | _filter_qemu_io
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# Put the data cluster at a multiple of 2 TB, resulting in the image apparently
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# having a multiple of 2^32 clusters
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# (To be more specific: It is at 32 PB)
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poke_file "$TEST_IMG" $((2048 + 8)) "\x00\x80\x00\x00\x00\x00\x00\x00"
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# An offset of 32 PB results in qemu-img check having to allocate an in-memory
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# refcount table of 128 TB (16 bit refcounts, 512 byte clusters), if qemu-img
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# don't check that referenced data cluster is far beyond the end of file.
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# But starting from 4.0, qemu-img does this check, and instead of "Cannot
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# allocate memory", we have an error showing that l2 entry is invalid.
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_check_test_img
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echo
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echo '=== Check leaks-fixed/corruptions-fixed report'
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echo
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# After leaks and corruptions were fixed, those numbers should be
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# reported by qemu-img check
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_make_test_img 64k
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# Allocate data cluster
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$QEMU_IO -c 'write 0 64k' "$TEST_IMG" | _filter_qemu_io
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reftable_ofs=$(peek_file_be "$TEST_IMG" 48 8)
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refblock_ofs=$(peek_file_be "$TEST_IMG" $reftable_ofs 8)
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# Introduce a leak: Make the image header's refcount 2
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poke_file_be "$TEST_IMG" "$refblock_ofs" 2 2
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l1_ofs=$(peek_file_be "$TEST_IMG" 40 8)
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# Introduce a corruption: Drop the COPIED flag from the (first) L1 entry
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l1_entry=$(peek_file_be "$TEST_IMG" $l1_ofs 8)
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l1_entry=$((l1_entry & ~(1 << 63)))
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poke_file_be "$TEST_IMG" $l1_ofs 8 $l1_entry
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echo
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# Should print the number of corruptions and leaks fixed
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# (Filter out all JSON fields (recognizable by their four-space
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# indentation), but keep the "-fixed" fields (by removing two spaces
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# from their indentation))
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# (Also filter out the L1 entry, because why not)
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_check_test_img -r all --output=json \
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| sed -e 's/^ \(.*\)-fixed"/\1-fixed"/' \
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-e '/^ /d' \
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-e "s/\\([^0-9a-f]\\)$(printf %x $l1_entry)\\([^0-9a-f]\\)/\1L1_ENTRY_VALUE\2/"
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# success, all done
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echo "*** done"
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rm -f $seq.full
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status=0
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