tests/qemu-iotests/138

   1 #!/usr/bin/env bash
   2 #
   3 # General test case for qcow2's image check
   4 #
   5 # Copyright (C) 2015 Red Hat, Inc.
   6 #
   7 # This program is free software; you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 2 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 #
  20
  21 # creator
  22 owner=mreitz@redhat.com
  23
  24 seq="$(basename $0)"
  25 echo "QA output created by $seq"
  26
  27 status=1        # failure is the default!
  28
  29 _cleanup()
  30 {
  31         _cleanup_test_img
  32 }
  33 trap "_cleanup; exit \$status" 0 1 2 3 15
  34
  35 # get standard environment, filters and checks
  36 . ./common.rc
  37 . ./common.filter
  38
  39 # This tests qcow2-specific low-level functionality
  40 _supported_fmt qcow2
  41 _supported_proto file fuse
  42 _supported_os Linux
  43 # With an external data file, data clusters are not refcounted
  44 # (so qemu-img check would not do much);
  45 # we want to modify the refcounts, so we need them to have a specific
  46 # format (namely u16)
  47 _unsupported_imgopts data_file 'refcount_bits=\([^1]\|.\([^6]\|$\)\)'
  48
  49 echo
  50 echo '=== Check on an image with a multiple of 2^32 clusters ==='
  51 echo
  52
  53 _make_test_img -o "cluster_size=512" 512
  54
  55 # Allocate L2 table
  56 $QEMU_IO -c 'write 0 512' "$TEST_IMG" | _filter_qemu_io
  57
  58 # Put the data cluster at a multiple of 2 TB, resulting in the image apparently
  59 # having a multiple of 2^32 clusters
  60 # (To be more specific: It is at 32 PB)
  61 poke_file "$TEST_IMG" $((2048 + 8)) "\x00\x80\x00\x00\x00\x00\x00\x00"
  62
  63 # An offset of 32 PB results in qemu-img check having to allocate an in-memory
  64 # refcount table of 128 TB (16 bit refcounts, 512 byte clusters), if qemu-img
  65 # don't check that referenced data cluster is far beyond the end of file.
  66 # But starting from 4.0, qemu-img does this check, and instead of "Cannot
  67 # allocate memory", we have an error showing that l2 entry is invalid.
  68 _check_test_img
  69
  70 echo
  71 echo '=== Check leaks-fixed/corruptions-fixed report'
  72 echo
  73
  74 # After leaks and corruptions were fixed, those numbers should be
  75 # reported by qemu-img check
  76 _make_test_img 64k
  77
  78 # Allocate data cluster
  79 $QEMU_IO -c 'write 0 64k' "$TEST_IMG" | _filter_qemu_io
  80
  81 reftable_ofs=$(peek_file_be "$TEST_IMG" 48 8)
  82 refblock_ofs=$(peek_file_be "$TEST_IMG" $reftable_ofs 8)
  83
  84 # Introduce a leak: Make the image header's refcount 2
  85 poke_file_be "$TEST_IMG" "$refblock_ofs" 2 2
  86
  87 l1_ofs=$(peek_file_be "$TEST_IMG" 40 8)
  88
  89 # Introduce a corruption: Drop the COPIED flag from the (first) L1 entry
  90 l1_entry=$(peek_file_be "$TEST_IMG" $l1_ofs 8)
  91 l1_entry=$((l1_entry & ~(1 << 63)))
  92 poke_file_be "$TEST_IMG" $l1_ofs 8 $l1_entry
  93
  94 echo
  95 # Should print the number of corruptions and leaks fixed
  96 # (Filter out all JSON fields (recognizable by their four-space
  97 # indentation), but keep the "-fixed" fields (by removing two spaces
  98 # from their indentation))
  99 # (Also filter out the L1 entry, because why not)
 100 _check_test_img -r all --output=json \
 101     | sed -e 's/^  \(.*\)-fixed"/\1-fixed"/' \
 102           -e '/^    /d' \
 103           -e "s/\\([^0-9a-f]\\)$(printf %x $l1_entry)\\([^0-9a-f]\\)/\1L1_ENTRY_VALUE\2/"
 104
 105 # success, all done
 106 echo "*** done"
 107 rm -f $seq.full
 108 status=0