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qcow2: Set MIN_L2_CACHE_SIZE to 2

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The L2 cache must cover at least two L2 tables, because during COW two
L2 tables are accessed simultaneously.

Reported-by: Alexander Graf <agraf@suse.de>
Cc: qemu-stable <qemu-stable@nongnu.org>
Signed-off-by: Max Reitz <mreitz@redhat.com>
Tested-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2015-06-01 18:09:17 +02:00 committed by Kevin Wolf
parent 9aa711d750
commit 57e2166959
1 changed files with 2 additions and 1 deletions
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3
block/qcow2.h
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@ -62,7 +62,8 @@
#define MIN_CLUSTER_BITS 9
#define MAX_CLUSTER_BITS 21
#define MIN_L2_CACHE_SIZE 1 /* cluster */
/* Must be at least 2 to cover COW */
#define MIN_L2_CACHE_SIZE 2 /* clusters */
/* Must be at least 4 to cover all cases of refcount table growth */
#define MIN_REFCOUNT_CACHE_SIZE 4 /* clusters */