tests/qemu-iotests/308

   1 #!/usr/bin/env bash
   2 # group: rw
   3 #
   4 # Test FUSE exports (in ways that are not captured by the generic
   5 # tests)
   6 #
   7 # Copyright (C) 2020 Red Hat, Inc.
   8 #
   9 # This program is free software; you can redistribute it and/or modify
  10 # it under the terms of the GNU General Public License as published by
  11 # the Free Software Foundation; either version 2 of the License, or
  12 # (at your option) any later version.
  13 #
  14 # This program is distributed in the hope that it will be useful,
  15 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 # GNU General Public License for more details.
  18 #
  19 # You should have received a copy of the GNU General Public License
  20 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 #
  22
  23 seq=$(basename "$0")
  24 echo "QA output created by $seq"
  25
  26 status=1        # failure is the default!
  27
  28 _cleanup()
  29 {
  30     _cleanup_qemu
  31     _cleanup_test_img
  32     rmdir "$EXT_MP" 2>/dev/null
  33     rm -f "$EXT_MP"
  34     rm -f "$COPIED_IMG"
  35 }
  36 trap "_cleanup; exit \$status" 0 1 2 3 15
  37
  38 # get standard environment, filters and checks
  39 . ./common.rc
  40 . ./common.filter
  41 . ./common.qemu
  42
  43 # Generic format, but needs a plain filename
  44 _supported_fmt generic
  45 if [ "$IMGOPTSSYNTAX" = "true" ]; then
  46     _unsupported_fmt $IMGFMT
  47 fi
  48 # We need the image to have exactly the specified size, and VPC does
  49 # not allow that by default
  50 _unsupported_fmt vpc
  51
  52 _supported_proto file # We create the FUSE export manually
  53 _supported_os Linux # We need /dev/urandom
  54
  55 # $1: Export ID
  56 # $2: Options (beyond the node-name and ID)
  57 # $3: Expected return value (defaults to 'return')
  58 # $4: Node to export (defaults to 'node-format')
  59 fuse_export_add()
  60 {
  61     # The grep -v is a filter for errors when /etc/fuse.conf does not contain
  62     # user_allow_other.  (The error is benign, but it is printed by fusermount
  63     # on the first mount attempt, so our export code cannot hide it.)
  64     _send_qemu_cmd $QEMU_HANDLE \
  65         "{'execute': 'block-export-add',
  66           'arguments': {
  67               'type': 'fuse',
  68               'id': '$1',
  69               'node-name': '${4:-node-format}',
  70               $2
  71           } }" \
  72         "${3:-return}" \
  73         | _filter_imgfmt \
  74         | grep -v 'option allow_other only allowed if'
  75 }
  76
  77 # $1: Export ID
  78 fuse_export_del()
  79 {
  80     _send_qemu_cmd $QEMU_HANDLE \
  81         "{'execute': 'block-export-del',
  82           'arguments': {
  83               'id': '$1'
  84           } }" \
  85         'return'
  86
  87     _send_qemu_cmd $QEMU_HANDLE \
  88         '' \
  89         'BLOCK_EXPORT_DELETED'
  90 }
  91
  92 # Return the length of the protocol file
  93 # $1: Protocol node export mount point
  94 # $2: Original file (to compare)
  95 get_proto_len()
  96 {
  97     len1=$(stat -c '%s' "$1")
  98     len2=$(stat -c '%s' "$2")
  99
 100     if [ "$len1" != "$len2" ]; then
 101         echo 'ERROR: Length of export and original differ:' >&2
 102         echo "$len1 != $len2" >&2
 103     else
 104         echo '(OK: Lengths of export and original are the same)' >&2
 105     fi
 106
 107     echo "$len1"
 108 }
 109
 110 COPIED_IMG="$TEST_IMG.copy"
 111 EXT_MP="$TEST_IMG.fuse"
 112
 113 echo '=== Set up ==='
 114
 115 # Create image with random data
 116 _make_test_img 64M
 117 $QEMU_IO -c 'write -s /dev/urandom 0 64M' "$TEST_IMG" | _filter_qemu_io
 118
 119 _launch_qemu
 120 _send_qemu_cmd $QEMU_HANDLE \
 121     "{'execute': 'qmp_capabilities'}" \
 122     'return'
 123
 124 # Separate blockdev-add calls for format and protocol so we can remove
 125 # the format layer later on
 126 _send_qemu_cmd $QEMU_HANDLE \
 127     "{'execute': 'blockdev-add',
 128       'arguments': {
 129           'driver': 'file',
 130           'node-name': 'node-protocol',
 131           'filename': '$TEST_IMG'
 132       } }" \
 133     'return'
 134
 135 _send_qemu_cmd $QEMU_HANDLE \
 136     "{'execute': 'blockdev-add',
 137       'arguments': {
 138           'driver': '$IMGFMT',
 139           'node-name': 'node-format',
 140           'file': 'node-protocol'
 141       } }" \
 142     'return'
 143
 144 echo
 145 echo '=== Mountpoint not present ==='
 146
 147 rmdir "$EXT_MP" 2>/dev/null
 148 rm -f "$EXT_MP"
 149 output=$(fuse_export_add 'export-err' "'mountpoint': '$EXT_MP'" error)
 150
 151 if echo "$output" | grep -q "Parameter 'type' does not accept value 'fuse'"; then
 152     _notrun 'No FUSE support'
 153 fi
 154
 155 echo "$output"
 156
 157 echo
 158 echo '=== Mountpoint is a directory ==='
 159
 160 mkdir "$EXT_MP"
 161 fuse_export_add 'export-err' "'mountpoint': '$EXT_MP'" error
 162 rmdir "$EXT_MP"
 163
 164 echo
 165 echo '=== Mountpoint is a regular file ==='
 166
 167 touch "$EXT_MP"
 168 fuse_export_add 'export-mp' "'mountpoint': '$EXT_MP'"
 169
 170 # Check that the export presents the same data as the original image
 171 $QEMU_IMG compare -f raw -F $IMGFMT -U "$EXT_MP" "$TEST_IMG"
 172
 173 # Some quick chmod tests
 174 stat -c 'Permissions pre-chmod: %a' "$EXT_MP"
 175
 176 # Verify that we cannot set +w
 177 chmod u+w "$EXT_MP" 2>&1 | _filter_testdir | _filter_imgfmt
 178 stat -c 'Permissions post-+w: %a' "$EXT_MP"
 179
 180 # But that we can set, say, +x (if we are so inclined)
 181 chmod u+x "$EXT_MP" 2>&1 | _filter_testdir | _filter_imgfmt
 182 stat -c 'Permissions post-+x: %a' "$EXT_MP"
 183
 184 echo
 185 echo '=== Mount over existing file ==='
 186
 187 # This is the coolest feature of FUSE exports: You can transparently
 188 # make images in any format appear as raw images
 189 fuse_export_add 'export-img' "'mountpoint': '$TEST_IMG'"
 190
 191 # Accesses both exports at the same time, so we get a concurrency test
 192 $QEMU_IMG compare -f raw -F raw -U "$EXT_MP" "$TEST_IMG"
 193
 194 # Just to be sure, we later want to compare the data offline.  Also,
 195 # this allows us to see that cp works without complaining.
 196 # (This is not a given, because cp will expect a short read at EOF.
 197 # Internally, qemu does not allow short reads, so we have to check
 198 # whether the FUSE export driver lets them work.)
 199 cp "$TEST_IMG" "$COPIED_IMG"
 200
 201 # $TEST_IMG will be in mode 0400 because it is read-only; we are going
 202 # to write to the copy, so make it writable
 203 chmod 0600 "$COPIED_IMG"
 204
 205 echo
 206 echo '=== Double export ==='
 207
 208 # We have already seen that exporting a node twice works fine, but you
 209 # cannot export anything twice on the same mount point.  The reason is
 210 # that qemu has to stat the given mount point, and this would have to
 211 # be answered by the same qemu instance if it already has an export
 212 # there.  However, it cannot answer the stat because it is itself
 213 # caught up in that same stat.
 214 fuse_export_add 'export-err' "'mountpoint': '$EXT_MP'" error
 215
 216 echo
 217 echo '=== Remove export ==='
 218
 219 # Double-check that $EXT_MP appears as a non-empty file (the raw image)
 220 $QEMU_IMG info -f raw "$EXT_MP" | grep 'virtual size'
 221
 222 fuse_export_del 'export-mp'
 223
 224 # See that the file appears empty again
 225 $QEMU_IMG info -f raw "$EXT_MP" | grep 'virtual size'
 226
 227 echo
 228 echo '=== Writable export ==='
 229
 230 fuse_export_add 'export-mp' "'mountpoint': '$EXT_MP', 'writable': true"
 231
 232 # Check that writing to the read-only export fails
 233 output=$($QEMU_IO -f raw -c 'write -P 42 1M 64k' "$TEST_IMG" 2>&1 \
 234              | _filter_qemu_io | _filter_testdir | _filter_imgfmt)
 235
 236 # Expected reference output: Opening the file fails because it has no
 237 # write permission
 238 reference="Could not open 'TEST_DIR/t.IMGFMT': Permission denied"
 239
 240 if echo "$output" | grep -q "$reference"; then
 241     echo "Writing to read-only export failed: OK"
 242 elif echo "$output" | grep -q "write failed: Permission denied"; then
 243     # With CAP_DAC_OVERRIDE (e.g. when running this test as root), the export
 244     # can be opened regardless of its file permissions, but writing will then
 245     # fail.  This is not the result for which we want to test, so count this as
 246     # a SKIP.
 247     _casenotrun "Opening RO export as R/W succeeded, perhaps because of" \
 248         "CAP_DAC_OVERRIDE"
 249
 250     # Still, write this to the reference output to make the test pass
 251     echo "Writing to read-only export failed: OK"
 252 else
 253     echo "Writing to read-only export failed: ERROR"
 254     echo "$output"
 255 fi
 256
 257 # But here it should work
 258 $QEMU_IO -f raw -c 'write -P 42 1M 64k' "$EXT_MP" | _filter_qemu_io
 259
 260 # (Adjust the copy, too)
 261 $QEMU_IO -f raw -c 'write -P 42 1M 64k' "$COPIED_IMG" | _filter_qemu_io
 262
 263 echo
 264 echo '=== Resizing exports ==='
 265
 266 # Here, we need to export the protocol node -- the format layer may
 267 # not be growable, simply because the format does not support it.
 268
 269 # Remove all exports and the format node first so permissions will not
 270 # get in the way
 271 fuse_export_del 'export-mp'
 272 fuse_export_del 'export-img'
 273
 274 _send_qemu_cmd $QEMU_HANDLE \
 275     "{'execute': 'blockdev-del',
 276       'arguments': {
 277           'node-name': 'node-format'
 278       } }" \
 279     'return'
 280
 281 # Now export the protocol node
 282 fuse_export_add \
 283     'export-mp' \
 284     "'mountpoint': '$EXT_MP', 'writable': true" \
 285     'return' \
 286     'node-protocol'
 287
 288 echo
 289 echo '--- Try growing non-growable export ---'
 290
 291 # Get the current size so we can write beyond the EOF
 292 orig_len=$(get_proto_len "$EXT_MP" "$TEST_IMG")
 293 orig_disk_usage=$(stat -c '%b' "$TEST_IMG")
 294
 295 # Should fail (exports are non-growable by default)
 296 # (Note that qemu-io can never write beyond the EOF, so we have to use
 297 # dd here)
 298 dd if=/dev/zero of="$EXT_MP" bs=1 count=64k seek=$orig_len 2>&1 \
 299     | _filter_testdir | _filter_imgfmt
 300
 301 echo
 302 echo '--- Resize export ---'
 303
 304 # But we can truncate it explicitly; even with fallocate
 305 fallocate -o "$orig_len" -l 64k "$EXT_MP"
 306
 307 new_len=$(get_proto_len "$EXT_MP" "$TEST_IMG")
 308 if [ "$new_len" != "$((orig_len + 65536))" ]; then
 309     echo 'ERROR: Unexpected post-truncate image size:'
 310     echo "$new_len != $((orig_len + 65536))"
 311 else
 312     echo 'OK: Post-truncate image size is as expected'
 313 fi
 314
 315 new_disk_usage=$(stat -c '%b' "$TEST_IMG")
 316 if [ "$new_disk_usage" -gt "$orig_disk_usage" ]; then
 317     echo 'OK: Disk usage grew with fallocate'
 318 else
 319     echo 'ERROR: Disk usage did not grow despite fallocate:'
 320     echo "$orig_disk_usage => $new_disk_usage"
 321 fi
 322
 323 echo
 324 echo '--- Try growing growable export ---'
 325
 326 # Now export as growable
 327 fuse_export_del 'export-mp'
 328 fuse_export_add \
 329     'export-mp' \
 330     "'mountpoint': '$EXT_MP', 'writable': true, 'growable': true" \
 331     'return' \
 332     'node-protocol'
 333
 334 # Now we should be able to write beyond the EOF
 335 dd if=/dev/zero of="$EXT_MP" bs=1 count=64k seek=$new_len 2>&1 \
 336     | _filter_testdir | _filter_imgfmt
 337
 338 new_len=$(get_proto_len "$EXT_MP" "$TEST_IMG")
 339 if [ "$new_len" != "$((orig_len + 131072))" ]; then
 340     echo 'ERROR: Unexpected post-grow image size:'
 341     echo "$new_len != $((orig_len + 131072))"
 342 else
 343     echo 'OK: Post-grow image size is as expected'
 344 fi
 345
 346 echo
 347 echo '--- Shrink export ---'
 348
 349 # Now go back to the original size
 350 truncate -s "$orig_len" "$EXT_MP"
 351
 352 new_len=$(get_proto_len "$EXT_MP" "$TEST_IMG")
 353 if [ "$new_len" != "$orig_len" ]; then
 354     echo 'ERROR: Unexpected post-truncate image size:'
 355     echo "$new_len != $orig_len"
 356 else
 357     echo 'OK: Post-truncate image size is as expected'
 358 fi
 359
 360 echo
 361 echo '=== Tear down ==='
 362
 363 _send_qemu_cmd $QEMU_HANDLE \
 364     "{'execute': 'quit'}" \
 365     'return'
 366
 367 wait=yes _cleanup_qemu
 368
 369 echo
 370 echo '=== Compare copy with original ==='
 371
 372 $QEMU_IMG compare -f raw -F $IMGFMT "$COPIED_IMG" "$TEST_IMG"
 373
 374 # success, all done
 375 echo "*** done"
 376 rm -f $seq.full
 377 status=0