diff options
| author | Max Reitz <mreitz@redhat.com> | 2015-06-01 18:09:17 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2015-06-12 15:54:00 +0200 |
| commit | 57e216695948a79d9ced82fc217a37cce70fd986 (patch) | |
| tree | acb4be45e3f02865206410239b5424b2fcb21bf6 /block | |
| parent | 9aa711d75030356f1e179b9f71780da5fd1a45bb (diff) | |
qcow2: Set MIN_L2_CACHE_SIZE to 2
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>
Diffstat (limited to 'block')
| -rw-r--r-- | block/qcow2.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/block/qcow2.h b/block/qcow2.h index 0076512af4..aa200223ce 100644 --- a/block/qcow2.h +++ b/block/qcow2.h @@ -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 */ |