diff mbox series

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

Message ID 1602524605-481160-8-git-send-email-andrey.shinkevich@virtuozzo.com
State New
Headers show
Series Apply COR-filter to the block-stream permanently | expand

Commit Message

Xingtao Yao (Fujitsu)" via Oct. 12, 2020, 5:43 p.m. UTC
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@virtuozzo.com>
---
 include/block/block_int.h | 4 ++++
 1 file changed, 4 insertions(+)
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Patch

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