tests/qemu-iotests/138

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