[PATCH v11 07/13] block: include supported_read_flags into BDS structure
Add the new member supported_read_flags to BlockDriverState structure.
It will control the BDRV_REQ_PREFETCH flag set for copy-on-read
operations.
Signed-off-by: Andrey Shinkevich <andrey.shinkevich(a)virtuozzo.com>
---
include/block/block_int.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/include/block/block_int.h b/include/block/block_int.h
index f782737..a142867 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -873,6 +873,10 @@ struct BlockDriverState {
/* I/O Limits */
BlockLimits bl;
+ /*
+ * Flags honored during pread (so far: BDRV_REQ_PREFETCH)
+ */
+ unsigned int supported_read_flags;
/* Flags honored during pwrite (so far: BDRV_REQ_FUA,
* BDRV_REQ_WRITE_UNCHANGED).
* If a driver does not support BDRV_REQ_WRITE_UNCHANGED, those
--
1.8.3.1