提交 c5fbe571 编写于 作者: S Stefan Hajnoczi 提交者: Kevin Wolf

block: split out bdrv_co_do_readv() and bdrv_co_do_writev()

The public interface for I/O in coroutine context is bdrv_co_readv() and
bdrv_co_writev().  Split out the request processing code into
bdrv_co_do_readv() and bdrv_co_writev() so that it can be called
internally when we refactor all request processing to use coroutines.
Signed-off-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
上级 1ed20acf
......@@ -72,6 +72,8 @@ static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs,
int64_t sector_num, int nb_sectors,
QEMUIOVector *iov);
static int coroutine_fn bdrv_co_flush_em(BlockDriverState *bs);
static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
static QTAILQ_HEAD(, BlockDriverState) bdrv_states =
QTAILQ_HEAD_INITIALIZER(bdrv_states);
......@@ -1253,13 +1255,14 @@ int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
return 0;
}
int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, QEMUIOVector *qiov)
/*
* Handle a read request in coroutine context
*/
static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
{
BlockDriver *drv = bs->drv;
trace_bdrv_co_readv(bs, sector_num, nb_sectors);
if (!drv) {
return -ENOMEDIUM;
}
......@@ -1270,12 +1273,21 @@ int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
return drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov);
}
int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, QEMUIOVector *qiov)
{
BlockDriver *drv = bs->drv;
trace_bdrv_co_readv(bs, sector_num, nb_sectors);
trace_bdrv_co_writev(bs, sector_num, nb_sectors);
return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov);
}
/*
* Handle a write request in coroutine context
*/
static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
{
BlockDriver *drv = bs->drv;
if (!bs->drv) {
return -ENOMEDIUM;
......@@ -1298,6 +1310,14 @@ int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
return drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov);
}
int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, QEMUIOVector *qiov)
{
trace_bdrv_co_writev(bs, sector_num, nb_sectors);
return bdrv_co_do_writev(bs, sector_num, nb_sectors, qiov);
}
/**
* Truncate file to 'offset' bytes (needed only for file protocols)
*/
......
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