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# Date Author Comment
e7108fea 09/12/2013 11:12 am Max Reitz

qcow2-cache: Empty cache

Add a function for emptying a cache, i.e., flushing it and marking all
elements invalid.

Signed-off-by: Max Reitz <>
Signed-off-by: Kevin Wolf <>
cf93980e 08/30/2013 04:48 pm Max Reitz

qcow2: Employ metadata overlap checks

The pre-write overlap check function is now called before most of the
qcow2 writes (aborting it on collision or other error).

Signed-off-by: Max Reitz <>
Signed-off-by: Kevin Wolf <>
737e150e 12/19/2012 09:31 am Paolo Bonzini

block: move include files to include/block/

Signed-off-by: Paolo Bonzini <>
6af4e9ea 06/15/2012 03:03 pm Paolo Bonzini

qcow2: always operate caches in writeback mode

Writethrough does not need special-casing anymore in the qcow2 caches.
The block layer adds flushes after every guest-initiated data write,
and these will also flush the qcow2 caches to the OS.

Signed-off-by: Paolo Bonzini <>...
3cce16f4 03/12/2012 04:14 pm Kevin Wolf

qcow2: Add some tracing

Signed-off-by: Kevin Wolf <>
Reviewed-by: Stefan Hajnoczi <>
7267c094 08/21/2011 07:01 am Anthony Liguori

Use glib memory allocation and free functions

qemu_malloc/qemu_free no longer exist after this commit.

Signed-off-by: Anthony Liguori <>
93913dfd 07/19/2011 04:39 pm Kevin Wolf

qcow2: Use Qcow2Cache in writeback mode during loadvm/savevm

In snapshotting there is no guest involved, so we can safely use a writeback
mode and do the flushes in the right place (i.e. at the very end). This
improves the time that creating/restoring an internal snapshot takes with an...
bf595021 01/31/2011 11:03 am Jes Sorensen

Reorganize struct Qcow2Cache for better struct packing

Move size after the two pointers in struct Qcow2Cache to get better
packing of struct elements on 64 bit architectures.

Signed-off-by: Jes Sorensen <>
Signed-off-by: Kevin Wolf <>
29c1a730 01/24/2011 05:41 pm Kevin Wolf

qcow2: Use QcowCache

Use the new functions of qcow2-cache.c for everything that works on refcount
block and L2 tables.

Signed-off-by: Kevin Wolf <>
3de0a294 01/24/2011 05:41 pm Kevin Wolf

qcow2: Batch flushes for COW

qcow2 calls bdrv_flush() after performing COW in order to ensure that the
L2 table change is never written before the copy is safe on disk. Now that the
L2 table is cached, we can wait with flushing until we write out the next L2...
49381094 01/24/2011 12:08 pm Kevin Wolf

qcow2: Add QcowCache

This adds some new cache functions to qcow2 which can be used for caching
refcount blocks and L2 tables. When used with cache=writethrough they work
like the old caching code which is spread all over qcow2, so for this case we
have merely a cleanup....