diff options
Diffstat (limited to 'block/io.c')
-rw-r--r-- | block/io.c | 84 |
1 files changed, 36 insertions, 48 deletions
@@ -925,31 +925,14 @@ static int coroutine_fn bdrv_driver_preadv(BlockDriverState *bs, return drv->bdrv_co_preadv(bs, offset, bytes, qiov, flags); } - /* FIXME - no need to calculate these if .bdrv_aio_preadv exists */ - sector_num = offset >> BDRV_SECTOR_BITS; - nb_sectors = bytes >> BDRV_SECTOR_BITS; - - if (!drv->bdrv_aio_preadv) { - assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0); - assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0); - assert((bytes >> BDRV_SECTOR_BITS) <= BDRV_REQUEST_MAX_SECTORS); - } - - if (drv->bdrv_co_readv) { - return drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov); - } else { + if (drv->bdrv_aio_preadv) { BlockAIOCB *acb; CoroutineIOCompletion co = { .coroutine = qemu_coroutine_self(), }; - if (drv->bdrv_aio_preadv) { - acb = drv->bdrv_aio_preadv(bs, offset, bytes, qiov, flags, - bdrv_co_io_em_complete, &co); - } else { - acb = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors, - bdrv_co_io_em_complete, &co); - } + acb = drv->bdrv_aio_preadv(bs, offset, bytes, qiov, flags, + bdrv_co_io_em_complete, &co); if (acb == NULL) { return -EIO; } else { @@ -957,6 +940,16 @@ static int coroutine_fn bdrv_driver_preadv(BlockDriverState *bs, return co.ret; } } + + sector_num = offset >> BDRV_SECTOR_BITS; + nb_sectors = bytes >> BDRV_SECTOR_BITS; + + assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0); + assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0); + assert((bytes >> BDRV_SECTOR_BITS) <= BDRV_REQUEST_MAX_SECTORS); + assert(drv->bdrv_co_readv); + + return drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov); } static int coroutine_fn bdrv_driver_pwritev(BlockDriverState *bs, @@ -981,45 +974,40 @@ static int coroutine_fn bdrv_driver_pwritev(BlockDriverState *bs, goto emulate_flags; } - /* FIXME - no need to calculate these if .bdrv_aio_pwritev exists */ - sector_num = offset >> BDRV_SECTOR_BITS; - nb_sectors = bytes >> BDRV_SECTOR_BITS; - - if (!drv->bdrv_aio_pwritev) { - assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0); - assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0); - assert((bytes >> BDRV_SECTOR_BITS) <= BDRV_REQUEST_MAX_SECTORS); - } - - if (drv->bdrv_co_writev_flags) { - ret = drv->bdrv_co_writev_flags(bs, sector_num, nb_sectors, qiov, - flags & bs->supported_write_flags); - flags &= ~bs->supported_write_flags; - } else if (drv->bdrv_co_writev) { - assert(!bs->supported_write_flags); - ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov); - } else { + if (drv->bdrv_aio_pwritev) { BlockAIOCB *acb; CoroutineIOCompletion co = { .coroutine = qemu_coroutine_self(), }; - if (drv->bdrv_aio_pwritev) { - acb = drv->bdrv_aio_pwritev(bs, offset, bytes, qiov, - flags & bs->supported_write_flags, - bdrv_co_io_em_complete, &co); - flags &= ~bs->supported_write_flags; - } else { - assert(!bs->supported_write_flags); - acb = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors, - bdrv_co_io_em_complete, &co); - } + acb = drv->bdrv_aio_pwritev(bs, offset, bytes, qiov, + flags & bs->supported_write_flags, + bdrv_co_io_em_complete, &co); + flags &= ~bs->supported_write_flags; if (acb == NULL) { ret = -EIO; } else { qemu_coroutine_yield(); ret = co.ret; } + goto emulate_flags; + } + + sector_num = offset >> BDRV_SECTOR_BITS; + nb_sectors = bytes >> BDRV_SECTOR_BITS; + + assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0); + assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0); + assert((bytes >> BDRV_SECTOR_BITS) <= BDRV_REQUEST_MAX_SECTORS); + + if (drv->bdrv_co_writev_flags) { + ret = drv->bdrv_co_writev_flags(bs, sector_num, nb_sectors, qiov, + flags & bs->supported_write_flags); + flags &= ~bs->supported_write_flags; + } else { + assert(drv->bdrv_co_writev); + assert(!bs->supported_write_flags); + ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov); } emulate_flags: |