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authorWen Congyang <wency@cn.fujitsu.com>2015-09-08 11:28:32 +0800
committerJeff Cody <jcody@redhat.com>2015-09-25 08:37:07 -0400
commit9568b511c9f91c3d21ea3e83426d4ee7168c98bb (patch)
treedb4332c4539db54b69b314a47a7eb4c921ca7104 /include
parent4da65c80921139f3e0ff63f5ea20c5d9c778364f (diff)
downloadhqemu-9568b511c9f91c3d21ea3e83426d4ee7168c98bb.zip
hqemu-9568b511c9f91c3d21ea3e83426d4ee7168c98bb.tar.gz
block: Introduce a new API bdrv_co_no_copy_on_readv()
In some cases, we need to disable copy-on-read, and just read the data. Signed-off-by: Wen Congyang <wency@cn.fujitsu.com> Message-id: 1441682913-14320-2-git-send-email-wency@cn.fujitsu.com Signed-off-by: Jeff Cody <jcody@redhat.com>
Diffstat (limited to 'include')
-rw-r--r--include/block/block.h9
1 files changed, 6 insertions, 3 deletions
diff --git a/include/block/block.h b/include/block/block.h
index ef67353..2dd6630 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -51,15 +51,16 @@ typedef struct BlockFragInfo {
} BlockFragInfo;
typedef enum {
- BDRV_REQ_COPY_ON_READ = 0x1,
- BDRV_REQ_ZERO_WRITE = 0x2,
+ BDRV_REQ_COPY_ON_READ = 0x1,
+ BDRV_REQ_ZERO_WRITE = 0x2,
/* The BDRV_REQ_MAY_UNMAP flag is used to indicate that the block driver
* is allowed to optimize a write zeroes request by unmapping (discarding)
* blocks if it is guaranteed that the result will read back as
* zeroes. The flag is only passed to the driver if the block device is
* opened with BDRV_O_UNMAP.
*/
- BDRV_REQ_MAY_UNMAP = 0x4,
+ BDRV_REQ_MAY_UNMAP = 0x4,
+ BDRV_REQ_NO_COPY_ON_READ = 0x8,
} BdrvRequestFlags;
typedef struct BlockSizes {
@@ -252,6 +253,8 @@ int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, QEMUIOVector *qiov);
int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
+int coroutine_fn bdrv_co_no_copy_on_readv(BlockDriverState *bs,
+ int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, QEMUIOVector *qiov);
/*
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