diff options
| author | Kevin Wolf <kwolf@redhat.com> | 2009-09-15 12:30:43 +0200 |
|---|---|---|
| committer | Anthony Liguori <aliguori@us.ibm.com> | 2009-10-05 09:32:52 -0500 |
| commit | 80ee15a6b274dfcedb0ad7db8c9e7d392210d6a1 (patch) | |
| tree | 4e20de957cf3d4709dd95082c96b9b1a7f8e3807 /block/qcow2.h | |
| parent | 85352471ce78d73b8306822959caace2e8880535 (diff) | |
qcow2: Increase maximum cluster size to 2 MB
This patch increases the maximum qcow2 cluster size to 2 MB. Starting with 128k
clusters, L2 tables span 2 GB or more of virtual disk space, causing 32 bit
truncation and wraparound of signed integers. Therefore some variables need to
use a larger data type.
While being at reviewing data types, change some integers that are used for
array indices to unsigned. In some places they were checked against some upper
limit but not for negative values. This could avoid potential segfaults with
corrupted qcow2 images.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Diffstat (limited to 'block/qcow2.h')
| -rw-r--r-- | block/qcow2.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/block/qcow2.h b/block/qcow2.h index ecc94cbfad..26ab5d9523 100644 --- a/block/qcow2.h +++ b/block/qcow2.h @@ -47,7 +47,7 @@ #define REFCOUNT_SHIFT 1 /* refcount size is 2 bytes */ #define MIN_CLUSTER_BITS 9 -#define MAX_CLUSTER_BITS 16 +#define MAX_CLUSTER_BITS 21 #define L2_CACHE_SIZE 16 |