diff options
| author | Alberto Garcia <berto@igalia.com> | 2019-05-10 19:22:54 +0300 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2019-05-20 17:08:56 +0200 |
| commit | b6c246942b14d3e0dec46a6c5868ed84e7dbea19 (patch) | |
| tree | ce424eaf7dd574d6ae54e64dcc380dac9c2de656 /block/qcow2.h | |
| parent | 50ba5b2d994853b38fed10e0841b119da0f8b8e5 (diff) | |
qcow2: Define and use QCOW2_COMPRESSED_SECTOR_SIZE
When an L2 table entry points to a compressed cluster the space used
by the data is specified in 512-byte sectors. This size is independent
from BDRV_SECTOR_SIZE and is specific to the qcow2 file format.
The QCOW2_COMPRESSED_SECTOR_SIZE constant defined in this patch makes
this explicit.
Signed-off-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block/qcow2.h')
| -rw-r--r-- | block/qcow2.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/block/qcow2.h b/block/qcow2.h index e62508d1ce..8d92ef1fee 100644 --- a/block/qcow2.h +++ b/block/qcow2.h @@ -74,6 +74,10 @@ #define MIN_CLUSTER_BITS 9 #define MAX_CLUSTER_BITS 21 +/* Defined in the qcow2 spec (compressed cluster descriptor) */ +#define QCOW2_COMPRESSED_SECTOR_SIZE 512U +#define QCOW2_COMPRESSED_SECTOR_MASK (~(QCOW2_COMPRESSED_SECTOR_SIZE - 1)) + /* Must be at least 2 to cover COW */ #define MIN_L2_CACHE_SIZE 2 /* cache entries */ |