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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>
(cherry picked from commit 57e2166959)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This commit is contained in:
Max Reitz
2015-06-01 18:09:17 +02:00
committed by Michael Roth
parent b153c8d3f3
commit c631ee6520
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 MIN_CLUSTER_BITS 9
#define MAX_CLUSTER_BITS 21 #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 */ /* Must be at least 4 to cover all cases of refcount table growth */
#define MIN_REFCOUNT_CACHE_SIZE 4 /* clusters */ #define MIN_REFCOUNT_CACHE_SIZE 4 /* clusters */