diff options
| author | Max Reitz <mreitz@redhat.com> | 2015-06-01 18:09:17 +0200 |
|---|---|---|
| committer | Michael Roth <mdroth@linux.vnet.ibm.com> | 2015-07-29 18:26:34 -0500 |
| commit | c631ee6520656aa5e3db01e4cc3203734ff63c63 (patch) | |
| tree | 6b598f3bcf9cbad31f356595f597e09d15baf3e3 | |
| parent | b153c8d3f3935f39d5a1b573d036b1f0f5a45812 (diff) | |
| download | qemu-c631ee6520656aa5e3db01e4cc3203734ff63c63.tar.gz | |
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>
(cherry picked from commit 57e216695948a79d9ced82fc217a37cce70fd986)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
| -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 422b825138..2f20949593 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 */ |