Public bug reported:
This commit prevents qemu from overallocating if qcow2 image is too big
(whatever that means): https://lists.gnu.org/archive/html/qemu-
devel/2014-07/msg01481.html
However, `qemu-img resize` isn't protected by the same code and allows
to go beyond that.
root@nwkr-laptop ~virtkick/hdd # qemu-img resize
33_test_609dffde-eb51-4b75-918d-b814f1bcb526.qcow2 +100000T
Image resized.
Which then causes "Active L1 table too large" error that cannot be
reversed.
root@nwkr-laptop ~virtkick/hdd # qemu-img info
33_test_609dffde-eb51-4b75-918d-b814f1bcb526.qcow2
qemu-img: Could not open '33_test_609dffde-eb51-4b75-918d-b814f1bcb526.qcow2':
Active L1 table too large
root@nwkr-laptop ~virtkick/hdd # qemu-img resize
33_test_609dffde-eb51-4b75-918d-b814f1bcb526.qcow2 -100000T
qemu-img: Could not open '33_test_609dffde-eb51-4b75-918d-b814f1bcb526.qcow2':
Active L1 table too large
I originally faces this bug when I passed wrong parameters to qemu-img in a
programatic way which caused an image to go corrupt. It's good to protect
user's images from being resized too much.
** Affects: qemu
Importance: Undecided
Status: New
** Tags: qemu-img
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https://bugs.launchpad.net/bugs/1592590
Title:
Prevent qemu-img resize from causing "Active L1 table too large"
Status in QEMU:
New
Bug description:
This commit prevents qemu from overallocating if qcow2 image is too
big (whatever that means): https://lists.gnu.org/archive/html/qemu-
devel/2014-07/msg01481.html
However, `qemu-img resize` isn't protected by the same code and allows
to go beyond that.
root@nwkr-laptop ~virtkick/hdd # qemu-img resize
33_test_609dffde-eb51-4b75-918d-b814f1bcb526.qcow2 +100000T
Image resized.
Which then causes "Active L1 table too large" error that cannot be
reversed.
root@nwkr-laptop ~virtkick/hdd # qemu-img info
33_test_609dffde-eb51-4b75-918d-b814f1bcb526.qcow2
qemu-img: Could not open
'33_test_609dffde-eb51-4b75-918d-b814f1bcb526.qcow2': Active L1 table too large
root@nwkr-laptop ~virtkick/hdd # qemu-img resize
33_test_609dffde-eb51-4b75-918d-b814f1bcb526.qcow2 -100000T
qemu-img: Could not open
'33_test_609dffde-eb51-4b75-918d-b814f1bcb526.qcow2': Active L1 table too large
I originally faces this bug when I passed wrong parameters to qemu-img in a
programatic way which caused an image to go corrupt. It's good to protect
user's images from being resized too much.
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