From c5fbe57111ef59c315a71cd80e8b0af59e36ff21 Mon Sep 17 00:00:00 2001 From: Stefan Hajnoczi Date: Wed, 5 Oct 2011 17:17:03 +0100 Subject: 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: Stefan Hajnoczi Signed-off-by: Kevin Wolf --- block.c | 34 +++++++++++++++++++++++++++------- 1 file changed, 27 insertions(+), 7 deletions(-) (limited to 'block.c') diff --git a/block.c b/block.c index 7c01f72f99..f4731eca6f 100644 --- a/block.c +++ b/block.c @@ -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) */ -- cgit v1.2.3