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# Date Author Comment
148da7ea 01/26/2010 10:59 pm Kevin Wolf

qcow2: Return 0/-errno in qcow2_alloc_cluster_offset

Returning 0/-errno allows it to distingush different errors classes. The
cluster offset of newly allocated clusters is now returned in the QCowL2Meta
struct.

Signed-off-by: Kevin Wolf <>...
72ecf02d 10/27/2009 07:28 pm Kevin Wolf

Revert "qcow2: Bring synchronous read/write back to life"

It was merely a workaround and the real fix is done now.
This reverts commit ef845c3bf421290153154635dc18eaa677cecb43.

Signed-off-by: Kevin Wolf <>
Signed-off-by: Anthony Liguori <>
ef845c3b 10/15/2009 05:32 pm Kevin Wolf

qcow2: Bring synchronous read/write back to life

When the synchronous read and write functions were dropped, they were replaced
by generic emulation functions. Unfortunately, these emulation functions don't
provide the same semantics as the original functions did....
80ee15a6 10/05/2009 05:32 pm Kevin Wolf

qcow2: Increase maximum cluster size to 2 MB

This patch increases the maximum qcow2 cluster size to 2 MB. Starting with 128k
clusters, L2 tables span 2 GB or more of virtual disk space, causing 32 bit
truncation and wraparound of signed integers. Therefore some variables need to...
72cf2d4f 09/12/2009 10:36 am Blue Swirl

Fix sys-queue.h conflict for good

Problem: Our file sys-queue.h is a copy of the BSD file, but there are
some additions and it's not entirely compatible. Because of that, there have
been conflicts with system headers on BSD systems. Some hacks have been
introduced in the commits 15cc9235840a22c289edbe064a9b3c19c5f49896,...
f214978a 09/10/2009 01:31 am Kevin Wolf

qcow2: Order concurrent AIO requests on the same unallocated cluster

When two AIO requests write to the same cluster, and this cluster is
unallocated, currently both requests allocate a new cluster and the second one
merges the first one when it is completed. This means an cluster allocation, a...
14899cdf 06/29/2009 04:52 pm Filip Navara

Fix QCOW2 debugging code to compile again

Updated to use C99 comments.

Signed-off-by: Filip Navara <>
Signed-off-by: Anthony Liguori <>
f7d0fe02 06/16/2009 11:18 pm Kevin Wolf

qcow2: Split out refcount handling

qcow2-refcount.c contains all functions which are related to cluster
allocation and management in the image file. A large part of this is the
reference counting of these clusters.

Also a header file qcow2.h is introduced which will contain the interface of...
45aba42f 06/16/2009 11:18 pm Kevin Wolf

qcow2: Split out guest cluster functions

qcow2-cluster.c contains all functions related to the management of guest
clusters, i.e. what the guest sees on its virtual disk. This code is about
mapping these guest clusters to host clusters in the image file using the...
c142442b 06/16/2009 11:18 pm Kevin Wolf

qcow2: Split out snapshot functions

qcow2-snapshot.c contains the code related to snapshotting.

Signed-off-by: Kevin Wolf <>
Signed-off-by: Anthony Liguori <>
ed6ccf0f 06/16/2009 11:18 pm Kevin Wolf

qcow2: Rename global functions

The qcow2 source is now split into several more manageable files. During the
conversion quite some functions that were static before needed to be changed to
be global to make the source compile again.

We were lucky enough not to get name conflicts with these additional global...