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Kevin Wolf 86fae10c64 mirror: Fail gracefully for source == target 
blockdev-mirror with the same node for source and target segfaults
today: A node is in its own backing chain, so mirror_start_job() decides
that this is an active commit. When adding the intermediate nodes with
block_job_add_bdrv(), it starts the iteration through the subchain with
the backing file of source, though, so it never reaches target and
instead runs into NULL at the base.

While we could fix that by starting with source itself, there is no
point in allowing mirroring a node into itself and I wouldn't be
surprised if this caused more problems later.

So just check for this scenario and error out.

Cc: qemu-stable@nongnu.org
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
2018-08-15 12:50:39 +02:00
..
sample_images
iotests: Fix CID for VMDK afl image
2018-02-13 12:27:17 +01:00
.gitignore
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001
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001.out
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002
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002.out
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004.out
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015
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015.out
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017
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017.out
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018
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018.out
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019
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019.out
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020
iotests: Fix 020 for vmdk
2018-01-23 12:34:43 +01:00
020.out
iotests: Fix 020 for vmdk
2018-01-23 12:34:43 +01:00
021
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021.out
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022
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022.out
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023
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023.out
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024
iotests: Add test for rebasing with relative paths
2018-06-11 16:18:45 +02:00
024.out
iotests: Add test for rebasing with relative paths
2018-06-11 16:18:45 +02:00
025
qemu-iotests: Enable 025 for luks
2018-03-26 12:17:40 +02:00
025.out
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026
qemu-iotests: Test qcow2 not leaking clusters on write error
2018-06-29 14:20:56 +02:00
026.out
qemu-iotests: Test qcow2 not leaking clusters on write error
2018-06-29 14:20:56 +02:00
026.out.nocache
qemu-iotests: Test qcow2 not leaking clusters on write error
2018-06-29 14:20:56 +02:00
027
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027.out
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028
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028.out
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029
qemu-img: Remove deprecated -s snapshot_id_or_name option
2018-06-11 16:18:45 +02:00
029.out
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030
job: Add JOB_STATUS_CHANGE QMP event
2018-05-23 14:30:51 +02:00
030.out
iotests: Tweak 030 in order to trigger a race condition with parallel jobs
2018-03-09 15:40:07 +01:00
031
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031.out
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032
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032.out
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033
iotests: Fix stuck NBD process on 33
2018-03-13 15:38:55 -05:00
033.out
iotest 033: add misaligned write-zeroes test via truncate
2018-03-02 18:39:07 +01:00
034
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034.out
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035
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035.out
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036
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036.out
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037
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037.out
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038
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038.out
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039
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039.out
qemu-iotests: limit non-_PROG-suffixed variables to common.rc
2017-10-06 16:28:58 +02:00
040
job: Add JOB_STATUS_CHANGE QMP event
2018-05-23 14:30:51 +02:00
040.out
block: Skip implicit nodes in query-block/blockstats
2017-07-24 15:06:04 +02:00
041
mirror: Fail gracefully for source == target
2018-08-15 12:50:39 +02:00
041.out
mirror: Fail gracefully for source == target
2018-08-15 12:50:39 +02:00
042
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042.out
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043
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043.out
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044
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044.out
block/qcow2: Add qcow2_refcount_area()
2017-07-11 17:45:02 +02:00
045
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045.out
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046
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046.out
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047
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047.out
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048
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048.out
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049
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049.out
qcow2: Use visitor for options in qcow2_create()
2018-03-09 15:17:47 +01:00
050
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050.out
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051
block: Don't silently truncate node names
2018-07-05 10:29:19 +02:00
051.out
block: Don't silently truncate node names
2018-07-05 10:29:19 +02:00
051.pc.out
block: Don't silently truncate node names
2018-07-05 10:29:19 +02:00
052
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052.out
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053
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053.out
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054
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054.out
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055
iotests: add pause_wait
2018-03-19 12:01:24 +01:00
055.out
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056
iotests: test manual job dismissal
2018-03-19 12:01:24 +01:00
056.out
iotests: test manual job dismissal
2018-03-19 12:01:24 +01:00
057
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057.out
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058
nbd-client: Refuse read-only client with BDRV_O_RDWR
2017-11-09 10:10:17 -06:00
058.out
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059
iotests: Skip test for ENOMEM error
2018-03-09 15:40:07 +01:00
059.out
iotests: Fix CID for VMDK afl image
2018-02-13 12:27:17 +01:00
060
tests: iotests: drop some stderr line
2018-06-30 17:50:48 +02:00
060.out
tests: iotests: drop some stderr line
2018-06-30 17:50:48 +02:00
061
iotests: Test downgrading an image using a small L2 slice size
2018-02-13 17:00:00 +01:00
061.out
block: Add Error parameter to bdrv_amend_options
2018-06-11 16:18:45 +02:00
062
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062.out
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063
qcow2: Fix src_offset in copy offloading
2018-06-29 14:20:56 +02:00
063.out
qcow2: Fix src_offset in copy offloading
2018-06-29 14:20:56 +02:00
064
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064.out
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065
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065.out
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066
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066.out
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067
iotests: Fix 067 for compat=0.10
2018-01-23 12:34:43 +01:00
067.out
iotests: Fix 067 for compat=0.10
2018-01-23 12:34:43 +01:00
068
snapshot/tests: Try loadvm twice
2017-09-06 15:19:01 +01:00
068.out
snapshot/tests: Try loadvm twice
2017-09-06 15:19:01 +01:00
069
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069.out
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070.out
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071
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071.out
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072.out
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073.out
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074
qemu-iotests: Remove blkdebug.conf after tests
2017-08-01 18:09:33 +02:00
074.out
qemu-img: Drop redundant error message in compare
2017-10-26 14:45:57 +02:00
075
iotests: fix 075 and 078
2017-11-27 11:25:41 +01:00
075.out
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076
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076.out
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077
iotests: 077: Filter out 'resume' lines
2017-11-14 18:06:25 +01:00
077.out
iotests: 077: Filter out 'resume' lines
2017-11-14 18:06:25 +01:00
078
iotests: fix 075 and 078
2017-11-27 11:25:41 +01:00
078.out
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079
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079.out
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080
qemu-img: Remove deprecated -s snapshot_id_or_name option
2018-06-11 16:18:45 +02:00
080.out
block: Add Error parameter to bdrv_amend_options
2018-06-11 16:18:45 +02:00
081
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081.out
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082
iotests: Add test for 'qemu-img convert -C' compatibility
2018-07-30 15:35:37 +02:00
082.out
iotests: Add test for 'qemu-img convert -C' compatibility
2018-07-30 15:35:37 +02:00
083
iotests: Make 083 less flaky
2017-11-14 18:06:25 +01:00
083.out
nbd: Minimal structured read for client
2017-10-30 21:48:41 +01:00
084
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084.out
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085
block: Use JSON null instead of "" to disable backing file
2017-07-24 13:35:11 +02:00
085.out
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086
qemu-iotests: 086 doesn't work with NFS
2018-05-23 13:29:06 +02:00
086.out
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087
iotests: Make 087 pass without AIO enabled
2017-11-17 18:21:31 +01:00
087.out
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088
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088.out
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089
block: Handle null backing link
2018-03-19 14:58:36 -05:00
089.out
block: Handle null backing link
2018-03-19 14:58:36 -05:00
090
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090.out
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091
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091.out
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092
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092.out
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093
qemu-iotests: Update 093 to improve the draining test
2018-08-15 12:50:39 +02:00
093.out
qemu-iotests: Test removing a throttle group member with a pending timer
2018-08-15 12:50:39 +02:00
094
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094.out
job: Add JOB_STATUS_CHANGE QMP event
2018-05-23 14:30:51 +02:00
095
job: Add JOB_STATUS_CHANGE QMP event
2018-05-23 14:30:51 +02:00
095.out
job: Add JOB_STATUS_CHANGE QMP event
2018-05-23 14:30:51 +02:00
096
python: futurize -f lib2to3.fixes.fix_has_key
2018-06-08 14:39:24 -03:00
096.out
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097
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097.out
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098
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098.out
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099
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099.out
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101
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101.out
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102
qemu-iotests: Fix locking issue in 102
2018-01-23 12:34:42 +01:00
102.out
qemu-iotests: Fix locking issue in 102
2018-01-23 12:34:42 +01:00
103
iotests: Test valid values of l2-cache-entry-size
2018-02-13 17:00:00 +01:00
103.out
qcow2: A grammar fix in conflicting cache sizing error message
2018-07-30 15:35:37 +02:00
104
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104.out
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105
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105.out
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106
iotests: Test preallocated truncate of 2G image
2018-04-03 17:39:37 +02:00
106.out
iotests: Test preallocated truncate of 2G image
2018-04-03 17:39:37 +02:00
107
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107.out
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108
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108.out
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109
job: Add JOB_STATUS_CHANGE QMP event
2018-05-23 14:30:51 +02:00
109.out
job: Add JOB_STATUS_CHANGE QMP event
2018-05-23 14:30:51 +02:00
110
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110.out
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111
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111.out
qemu-img: Check for backing image if specified during create
2017-07-18 15:27:37 +02:00
112
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112.out
block: Add Error parameter to bdrv_amend_options
2018-06-11 16:18:45 +02:00
113
iotests: Rework 113
2018-06-11 16:18:45 +02:00
113.out
iotests: Rework 113
2018-06-11 16:18:45 +02:00
114
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114.out
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115
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115.out
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116
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116.out
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117
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117.out
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118
python: futurize -f lib2to3.fixes.fix_numliterals
2018-06-08 14:39:24 -03:00
118.out
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119
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119.out
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120
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120.out
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121
qcow2: Reset free_cluster_index when allocating a new refcount block
2018-03-26 12:16:00 +02:00
121.out
qcow2: Reset free_cluster_index when allocating a new refcount block
2018-03-26 12:16:00 +02:00
122
iotests: Test post-backing convert target behavior
2018-06-11 16:18:45 +02:00
122.out
qemu-img: align result of is_allocated_sectors
2018-07-12 18:24:08 +02:00
123
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123.out
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124
job: Add JOB_STATUS_CHANGE QMP event
2018-05-23 14:30:51 +02:00
124.out
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125
iotests: Add cluster_size=64k to 125
2017-10-26 15:01:14 +02:00
125.out
iotests: Add cluster_size=64k to 125
2017-10-26 15:01:14 +02:00
126
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126.out
qemu-iotests: Filter NFS paths
2018-05-23 13:29:03 +02:00
127
iotests: Add test for dataplane mirroring
2017-10-26 15:01:13 +02:00
127.out
job: Add JOB_STATUS_CHANGE QMP event
2018-05-23 14:30:51 +02:00
128
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128.out
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129
iotests: Mark all tests executable
2018-03-09 15:40:07 +01:00
129.out
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130
iotests: Disable some tests for compat=0.10
2018-01-23 12:34:43 +01:00
130.out
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131
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131.out
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132
iotests: Mark all tests executable
2018-03-09 15:40:07 +01:00
132.out
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133
iotests: Add test for non-string option reopening
2017-11-17 18:21:30 +01:00
133.out
iotests: Add test for non-string option reopening
2017-11-17 18:21:30 +01:00
134
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134.out
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135.out
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136
python: futurize -f lib2to3.fixes.fix_has_key
2018-06-08 14:39:24 -03:00
136.out
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137
iotests: Add l2-cache-entry-size to iotest 137
2018-02-13 17:00:00 +01:00
137.out
qcow2: A grammar fix in conflicting cache sizing error message
2018-07-30 15:35:37 +02:00
138
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138.out
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139
iotests: Mark all tests executable
2018-03-09 15:40:07 +01:00
139.out
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140
nbd-client: Refuse read-only client with BDRV_O_RDWR
2017-11-09 10:10:17 -06:00
140.out
nbd: Fix iotests failure due to changed client error message
2017-07-17 13:57:42 -05:00
141
job: Add JOB_STATUS_CHANGE QMP event
2018-05-23 14:30:51 +02:00
141.out
job: Add JOB_STATUS_CHANGE QMP event
2018-05-23 14:30:51 +02:00
142
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142.out
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143
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143.out
nbd: Fix iotests failure due to changed client error message
2017-07-17 13:57:42 -05:00
144
job: Add JOB_STATUS_CHANGE QMP event
2018-05-23 14:30:51 +02:00
144.out
job: Add JOB_STATUS_CHANGE QMP event
2018-05-23 14:30:51 +02:00
145
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145.out
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146
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146.out
block: fix iotest 146 output expectations
2018-03-19 12:01:39 +01:00
147
iotest 147: add cases to test new @name parameter of nbd-server-add
2018-01-26 09:37:21 -06:00
147.out
iotest 147: add cases to test new @name parameter of nbd-server-add
2018-01-26 09:37:21 -06:00
148
iotests: Mark all tests executable
2018-03-09 15:40:07 +01:00
148.out
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149
qemu-iotests: Use host_device instead of file in 149
2018-07-23 16:50:43 +02:00
149.out
qemu-iotests: Use host_device instead of file in 149
2018-07-23 16:50:43 +02:00
150
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150.out
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151
iotests: Add test for active mirroring
2018-06-18 17:05:17 +02:00
151.out
iotests: Add test for active mirroring
2018-06-18 17:05:17 +02:00
152
iotests: Mark all tests executable
2018-03-09 15:40:07 +01:00
152.out
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153
iotests: 153: Fix dead code
2018-07-12 18:24:08 +02:00
153.out
iotests: 153: Fix dead code
2018-07-12 18:24:08 +02:00
154
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154.out
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155
iotests: Move qmp_to_opts() to VM
2018-05-23 14:30:51 +02:00
155.out
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156
job: Add JOB_STATUS_CHANGE QMP event
2018-05-23 14:30:51 +02:00
156.out
job: Add JOB_STATUS_CHANGE QMP event
2018-05-23 14:30:51 +02:00
157
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157.out
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158
qemu-img: Check for backing image if specified during create
2017-07-18 15:27:37 +02:00
158.out
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159
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159.out
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160
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160.out
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162
qemu-iotests/162: Fix leaked temporary files
2017-08-01 18:09:33 +02:00
162.out
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163
iotests: Mark all tests executable
2018-03-09 15:40:07 +01:00
163.out
qemu-iotests: add shrinking image test
2017-09-26 15:00:32 +02:00
165
python: futurize -f libfuturize.fixes.fix_print_with_import
2018-06-08 14:39:24 -03:00
165.out
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169
iotests: fix 169
2018-04-16 13:35:32 +02:00
169.out
iotests: enable shared migration cases in 169
2018-03-26 21:17:24 +02:00
170
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170.out
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171
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171.out
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172
qemu-iotests: Add missing -machine accel=qtest
2017-09-26 14:46:23 +02:00
172.out
hw/block/fdc: Convert to realize
2017-09-18 19:43:38 -04:00
173
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173.out
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174
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174.out
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175
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175.out
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176
block: maintain persistent disabled bitmaps
2018-02-13 16:59:58 +01:00
176.out
iotests: Fix 176 on 32-bit host
2017-11-21 14:54:02 +01:00
177
iotests: Split 177 into two parts for compat=0.10
2018-01-23 12:34:43 +01:00
177.out
iotests: Split 177 into two parts for compat=0.10
2018-01-23 12:34:43 +01:00
178
iotests: add test 178 for qemu-img measure
2017-07-11 17:45:01 +02:00
178.out.qcow2
iotests: add test 178 for qemu-img measure
2017-07-11 17:45:01 +02:00
178.out.raw
iotests: add test 178 for qemu-img measure
2017-07-11 17:45:01 +02:00
179
qemu-iotests: Remove blkdebug.conf after tests
2017-08-01 18:09:33 +02:00
179.out
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181
iotests: Skip 181 and 201 without userfaultfd
2018-05-15 16:15:21 +02:00
181.out
iotests: fix 181: enable postcopy-ram capability on target
2017-09-26 14:46:23 +02:00
182
qemu-iotests: Use -nographic in 182
2017-11-17 13:35:59 +01:00
182.out
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183
qemu-iotests: Remove _supported_fmt dmg
2018-04-10 16:33:43 +02:00
183.out
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184
iotests: Make 184 image-less
2018-01-23 12:34:43 +01:00
184.out
iotests: Make 184 image-less
2018-01-23 12:34:43 +01:00
185
job: Add JOB_STATUS_CHANGE QMP event
2018-05-23 14:30:51 +02:00
185.out
job: Add JOB_STATUS_CHANGE QMP event
2018-05-23 14:30:51 +02:00
186
iotests: Update 186 after commit ac64273c66ab136c44043259162
2018-04-03 16:58:48 +02:00
186.out
iotests: Update 186 after commit ac64273c66ab136c44043259162
2018-04-03 16:58:48 +02:00
187
qemu-iotests: Test reopen between read-only and read-write
2017-08-08 15:19:16 +02:00
187.out
qemu-io: Drop write permissions before read-only reopen
2017-09-26 14:46:23 +02:00
188
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188.out
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189
qemu-img: Check for backing image if specified during create
2017-07-18 15:27:37 +02:00
189.out
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190
iotests: Add test of recent fix to 'qemu-img measure'
2017-08-01 18:09:33 +02:00
190.out
iotests: Add test of recent fix to 'qemu-img measure'
2017-08-01 18:09:33 +02:00
191
job: Add JOB_STATUS_CHANGE QMP event
2018-05-23 14:30:51 +02:00
191.out
job: Add JOB_STATUS_CHANGE QMP event
2018-05-23 14:30:51 +02:00
192
iotests: rewrite 192 to use _launch_qemu to fix LUKS support
2017-09-05 14:17:26 -05:00
192.out
iotests: Add non-shared storage migration case 192
2017-08-15 10:03:28 -05:00
194
qemu-iotests: Remove _supported_fmt dmg
2018-04-10 16:33:43 +02:00
194.out
qemu-iotests: Extend non-shared storage migration test (194)
2017-08-30 13:00:37 -05:00
195
iotests: Fix 195 if IMGFMT is part of TEST_DIR
2017-10-06 16:30:47 +02:00
195.out
qemu-iotests: Test change-backing-file command
2017-09-26 14:46:23 +02:00
196
iotests: test clearing unknown autoclear_features by qcow2
2017-11-17 18:06:21 +01:00
196.out
iotests: test clearing unknown autoclear_features by qcow2
2017-11-17 18:06:21 +01:00
197
block: Fix copy-on-read crash with partial final cluster
2018-07-10 10:36:15 +02:00
197.out
block: Fix copy-on-read crash with partial final cluster
2018-07-10 10:36:15 +02:00
198
iotests: Filter compat-dependent info in 198
2018-01-23 12:34:43 +01:00
198.out
iotests: Filter compat-dependent info in 198
2018-01-23 12:34:43 +01:00
199
iotests: add dirty bitmap postcopy test
2018-03-13 17:06:32 -04:00
199.out
iotests: add dirty bitmap postcopy test
2018-03-13 17:06:32 -04:00
200
iotests: Make 200 run on tmpfs
2018-01-31 22:37:00 -05:00
200.out
qemu-iotest: add test for blockjob coroutine race condition
2017-11-21 11:58:12 -05:00
201
iotests: Skip 181 and 201 without userfaultfd
2018-05-15 16:15:21 +02:00
201.out
tests/qemu-iotests: adding savevm/loadvm with postcopy flag test
2018-01-23 12:33:07 +01:00
202
qemu-iotests: add 202 external snapshots IOThread test
2017-12-19 10:25:09 +00:00
202.out
qemu-iotests: add 202 external snapshots IOThread test
2017-12-19 10:25:09 +00:00
203
qemu-iotests: fix 203 migration completion race
2018-03-09 15:40:07 +01:00
203.out
qemu-iotests: fix 203 migration completion race
2018-03-09 15:40:07 +01:00
204
iotests: Split 177 into two parts for compat=0.10
2018-01-23 12:34:43 +01:00
204.out
iotests: Split 177 into two parts for compat=0.10
2018-01-23 12:34:43 +01:00
205
iotests: blacklist bochs and cloop for 205 and 208
2018-04-10 16:33:08 +02:00
205.out
iotest 205: new test for qmp nbd-server-remove
2018-01-26 09:37:21 -06:00
206
block/create: Mark blockdev-create stable
2018-05-30 13:31:18 +02:00
206.out
block/create: Mark blockdev-create stable
2018-05-30 13:31:18 +02:00
207
block/create: Mark blockdev-create stable
2018-05-30 13:31:18 +02:00
207.out
block/create: Mark blockdev-create stable
2018-05-30 13:31:18 +02:00
208
iotests: blacklist bochs and cloop for 205 and 208
2018-04-10 16:33:08 +02:00
208.out
iotests: add 208 nbd-server + blockdev-snapshot-sync test case
2018-03-13 15:38:55 -05:00
209
iotests: new test 209 for NBD BLOCK_STATUS
2018-03-13 15:44:09 -05:00
209.out
iotests: new test 209 for NBD BLOCK_STATUS
2018-03-13 15:44:09 -05:00
210
block/create: Mark blockdev-create stable
2018-05-30 13:31:18 +02:00
210.out
block/create: Mark blockdev-create stable
2018-05-30 13:31:18 +02:00
211
block/create: Mark blockdev-create stable
2018-05-30 13:31:18 +02:00
211.out
block/create: Mark blockdev-create stable
2018-05-30 13:31:18 +02:00
212
block/create: Mark blockdev-create stable
2018-05-30 13:31:18 +02:00
212.out
block/create: Mark blockdev-create stable
2018-05-30 13:31:18 +02:00
213
block/create: Mark blockdev-create stable
2018-05-30 13:31:18 +02:00
213.out
block/create: Mark blockdev-create stable
2018-05-30 13:31:18 +02:00
214
iotests: Split 214 off of 122
2018-05-15 16:15:21 +02:00
214.out
iotests: Split 214 off of 122
2018-05-15 16:15:21 +02:00
215
iotests: Copy 197 for COR filter driver
2018-05-15 16:15:21 +02:00
215.out
iotests: Copy 197 for COR filter driver
2018-05-15 16:15:21 +02:00
216
iotests: Let 216 make use of qemu-io's exit code
2018-06-11 16:18:45 +02:00
216.out
iotests: Let 216 make use of qemu-io's exit code
2018-06-11 16:18:45 +02:00
217
iotests: Repairing error during snapshot deletion
2018-06-11 16:18:45 +02:00
217.out
iotests: Repairing error during snapshot deletion
2018-06-11 16:18:45 +02:00
218
iotests: Add test for cancelling a mirror job
2018-05-08 10:47:27 -04:00
218.out
iotests: Add test for cancelling a mirror job
2018-05-08 10:47:27 -04:00
219
iotests: Fix 219's timing
2018-06-11 16:18:45 +02:00
219.out
iotests: Fix 219's timing
2018-06-11 16:18:45 +02:00
221
iotests: Add test 221 to catch qemu-img map regression
2018-06-15 14:49:44 +02:00
221.out
iotests: Add test 221 to catch qemu-img map regression
2018-06-15 14:49:44 +02:00
222
iotests: 222: Don't run with luks
2018-07-10 11:55:11 +02:00
222.out
iotests: add 222 to test basic fleecing
2018-07-02 15:24:07 -05:00
223
iotests: Disallow compat=0.10 in 223
2018-07-23 16:50:43 +02:00
223.out
iotests: New test 223 for exporting dirty bitmap over NBD
2018-07-02 19:50:37 -05:00
225
iotests: Add VMDK backing file correlation test
2018-07-09 19:43:24 +02:00
225.out
iotests: Add VMDK backing file correlation test
2018-07-09 19:43:24 +02:00
226
iotests: Don't lock /dev/null in 226
2018-07-30 15:35:37 +02:00
226.out
iotests: add test 226 for file driver types
2018-07-12 18:24:08 +02:00
227
qemu-iotests: Test query-blockstats with -drive and -blockdev
2018-07-30 15:35:37 +02:00
227.out
qemu-iotests: Test query-blockstats with -drive and -blockdev
2018-07-30 15:35:37 +02:00
check
qemu-iotests: Use ppc64 qemu_arch on ppc64le host
2018-04-03 17:39:37 +02:00
common.config
qemu-iotests: Use ppc64 qemu_arch on ppc64le host
2018-04-03 17:39:37 +02:00
common.filter
main-loop: drop spin_counter
2018-06-01 16:01:29 +01:00
common.pattern
…
common.qemu
iotests: Add failure matching to common.qemu
2018-05-15 16:15:21 +02:00
common.rc
iotests: nbd: Stop qemu-nbd before remaking image
2018-07-12 18:24:08 +02:00
COPYING
…
group
qemu-iotests: Test query-blockstats with -drive and -blockdev
2018-07-30 15:35:37 +02:00
iotests.py
Python queue, 2018-06-11
2018-06-12 11:56:21 +01:00
Makefile
…
nbd-fault-injector.py
python: futurize -f libfuturize.fixes.fix_print_with_import
2018-06-08 14:39:24 -03:00
qcow2.py
python: futurize -f libfuturize.fixes.fix_print_with_import
2018-06-08 14:39:24 -03:00
qed.py
python: futurize -f libfuturize.fixes.fix_print_with_import
2018-06-08 14:39:24 -03:00
README
…
socket_scm_helper.c
…

README 

=== This is the QEMU I/O test suite ===

* Intro

This package contains a simple test suite for the I/O layer of qemu.
It does not require a guest, but only the qemu, qemu-img and qemu-io
binaries.  This does limit it to exercise the low-level I/O path only
but no actual block drivers like ide, scsi or virtio.

* Usage

Just run ./check to run all tests for the raw image format, or ./check
-qcow2 to test the qcow2 image format.  The output of ./check -h explains
additional options to test further image formats or I/O methods.

* Feedback and patches

Please send improvements to the test suite, general feedback or just
reports of failing tests cases to qemu-devel@nongnu.org with a CC:
to qemu-block@nongnu.org.