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qemu/tests/qemu-iotests/046.out
Alberto Garcia 80f5c01183 qcow2: Forbid discard in qcow2 v2 images with backing files 
A discard request deallocates the selected clusters so they read back
as zeroes. This is done by clearing the cluster offset field and
setting QCOW_OFLAG_ZERO in the L2 entry.

This flag is however only supported when qcow_version >= 3. In older
images the cluster is simply deallocated, exposing any possible stale
data from the backing file.

Since discard is an advisory operation it's safer to simply forbid it
in this scenario.

Note that we are adding this check to qcow2_co_pdiscard() and not to
qcow2_cluster_discard() or discard_in_l2_slice() because the last
two are also used by qcow2_snapshot_create() to discard the clusters
used by the VM state. In this case there's no risk of exposing stale
data to the guest and we really want that the clusters are always
discarded.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Message-Id: <20200331114345.29993-1-berto@igalia.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
2020-04-07 13:51:09 +02:00

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QA output created by 046
== creating backing file for COW tests ==
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728
wrote 65536/65536 bytes at offset 0
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 65536
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 131072
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 196608
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 262144
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 327680
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 393216
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 458752
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 524288
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 589824
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 655360
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 720896
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 786432
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 851968
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 917504
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 983040
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 1048576
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 1114112
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 1179648
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 1245184
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 1310720
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 1376256
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 1441792
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 1507328
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 1572864
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 1638400
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 1703936
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 1769472
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 1835008
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 1900544
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 1966080
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 2031616
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=6442450944 backing_file=TEST_DIR/t.IMGFMT.base
== Some concurrent requests touching the same cluster ==
blkdebug: Suspended request 'A'
blkdebug: Resuming request 'A'
wrote 8192/8192 bytes at offset XXX
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 8192/8192 bytes at offset XXX
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 8192/8192 bytes at offset XXX
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
blkdebug: Suspended request 'A'
blkdebug: Resuming request 'A'
wrote 8192/8192 bytes at offset XXX
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset XXX
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
blkdebug: Suspended request 'A'
blkdebug: Resuming request 'A'
wrote 8192/8192 bytes at offset XXX
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset XXX
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 32768/32768 bytes at offset XXX
32 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
blkdebug: Suspended request 'A'
blkdebug: Resuming request 'A'
wrote 8192/8192 bytes at offset XXX
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 57344/57344 bytes at offset XXX
56 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 4096/4096 bytes at offset XXX
4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 32768/32768 bytes at offset XXX
32 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
discard 65536/65536 bytes at offset XXX
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
blkdebug: Suspended request 'A'
blkdebug: Resuming request 'A'
wrote 8192/8192 bytes at offset XXX
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 57344/57344 bytes at offset XXX
56 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 4096/4096 bytes at offset XXX
4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset XXX
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
discard 65536/65536 bytes at offset XXX
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
blkdebug: Suspended request 'A'
blkdebug: Resuming request 'A'
wrote 8192/8192 bytes at offset XXX
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 57344/57344 bytes at offset XXX
56 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
blkdebug: Suspended request 'A'
blkdebug: Resuming request 'A'
wrote 8192/8192 bytes at offset XXX
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 98304/98304 bytes at offset XXX
96 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
blkdebug: Suspended request 'A'
blkdebug: Resuming request 'A'
wrote 8192/8192 bytes at offset XXX
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 81920/81920 bytes at offset XXX
80 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
blkdebug: Suspended request 'A'
blkdebug: Resuming request 'A'
wrote 32768/32768 bytes at offset XXX
32 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 98304/98304 bytes at offset XXX
96 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
== Verify image content ==
read 65536/65536 bytes at offset 0
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 8192/8192 bytes at offset 65536
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 8192/8192 bytes at offset 73728
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 16384/16384 bytes at offset 81920
16 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 8192/8192 bytes at offset 98304
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 8192/8192 bytes at offset 106496
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 8192/8192 bytes at offset 114688
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 8192/8192 bytes at offset 122880
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 32768/32768 bytes at offset 131072
32 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 8192/8192 bytes at offset 163840
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 65536/65536 bytes at offset 172032
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 24576/24576 bytes at offset 237568
24 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 32768/32768 bytes at offset 262144
32 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 8192/8192 bytes at offset 294912
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 8192/8192 bytes at offset 303104
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 65536/65536 bytes at offset 311296
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 16384/16384 bytes at offset 376832
16 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 24576/24576 bytes at offset 393216
24 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 8192/8192 bytes at offset 417792
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 8192/8192 bytes at offset 425984
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 57344/57344 bytes at offset 434176
56 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 24576/24576 bytes at offset 491520
24 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 8192/8192 bytes at offset 516096
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 4096/4096 bytes at offset 524288
4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 20480/20480 bytes at offset 528384
20 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 8192/8192 bytes at offset 548864
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 8192/8192 bytes at offset 557056
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 57344/57344 bytes at offset 565248
56 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 24576/24576 bytes at offset 622592
24 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 8192/8192 bytes at offset 647168
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 4096/4096 bytes at offset 655360
4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 20480/20480 bytes at offset 659456
20 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 8192/8192 bytes at offset 679936
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 8192/8192 bytes at offset 688128
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 57344/57344 bytes at offset 696320
56 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 32768/32768 bytes at offset 753664
32 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 16384/16384 bytes at offset 786432
16 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 98304/98304 bytes at offset 802816
96 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 8192/8192 bytes at offset 901120
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 8192/8192 bytes at offset 909312
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 16384/16384 bytes at offset 917504
16 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 81920/81920 bytes at offset 933888
80 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 16384/16384 bytes at offset 1015808
16 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 8192/8192 bytes at offset 1032192
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 8192/8192 bytes at offset 1040384
8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 16384/16384 bytes at offset 1048576
16 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 32768/32768 bytes at offset 1064960
32 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 32768/32768 bytes at offset 1130496
32 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 16384/16384 bytes at offset 1163264
16 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
No errors were found on the image.
*** done
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