[PATCH v11 07/13] block: include supported_read_flags into BDS structure

[Andrey Shinkevich <andrey.shinkevich@xxxxxxxxxxxxx>]

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@xxxxxxxxxxxxx>
---
 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