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# Date Author Comment
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....