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From: Max Reitz <mreitz@redhat.com>
Date: Wed, 15 Jun 2016 17:36:28 +0200
Message-Id: <20160615153630.2116-1-mreitz@redhat.com>
Subject: [Qemu-devel] [PATCH 0/2] qcow2: Avoid making the L1 table too big
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To: qemu-block@nongnu.org
Cc: qemu-devel@nongnu.org, Max Reitz <mreitz@redhat.com>, Kevin Wolf <kwolf@redhat.com>

See https://bugs.launchpad.net/qemu/+bug/1592590 for a bug report.

Reproducer:

$ ./qemu-img create -f qcow2 test.qcow2 1M
Formatting 'test.qcow2', fmt=qcow2 size=1048576 encryption=off
cluster_size=65536 lazy_refcounts=off refcount_bits=16
$ ./qemu-img resize test.qcow2 100000T
Image resized.
$ ./qemu-img info test.qcow2
qemu-img: Could not open 'test.qcow2': Active L1 table too large

After this series:

$ ./qemu-img resize test.qcow2 100000T
qemu-img: Error resizing image: File too large


Max Reitz (2):
  qemu-img: Use strerror() for generic resize error
  qcow2: Avoid making the L1 table too big

 block/qcow2-cluster.c | 2 +-
 qemu-img.c            | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

-- 
2.8.3