From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:46034) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VrSiR-0006s6-RC for qemu-devel@nongnu.org; Fri, 13 Dec 2013 08:23:45 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1VrSiL-00028l-Qf for qemu-devel@nongnu.org; Fri, 13 Dec 2013 08:23:39 -0500 Received: from mx1.redhat.com ([209.132.183.28]:2352) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VrSiL-00028U-DT for qemu-devel@nongnu.org; Fri, 13 Dec 2013 08:23:33 -0500 From: Kevin Wolf Date: Fri, 13 Dec 2013 14:22:46 +0100 Message-Id: <1386940979-3824-12-git-send-email-kwolf@redhat.com> In-Reply-To: <1386940979-3824-1-git-send-email-kwolf@redhat.com> References: <1386940979-3824-1-git-send-email-kwolf@redhat.com> Subject: [Qemu-devel] [PATCH v2 11/24] block: Introduce bdrv_aligned_pwritev() List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: kwolf@redhat.com, pbonzini@redhat.com, pl@kamp.de, stefanha@redhat.com This separates the part of bdrv_co_do_writev() that needs to happen before the request is modified to match the backend alignment, and a part that needs to be executed afterwards and passes the request to the BlockDriver. Signed-off-by: Kevin Wolf --- block.c | 62 +++++++++++++++++++++++++++++++++++++++++--------------------- 1 file changed, 41 insertions(+), 21 deletions(-) diff --git a/block.c b/block.c index 7812d8f..e26e31c 100644 --- a/block.c +++ b/block.c @@ -2958,34 +2958,20 @@ static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, } /* - * Handle a write request in coroutine context + * Forwards an already correctly aligned write request to the BlockDriver. */ -static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, - int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, - BdrvRequestFlags flags) +static int coroutine_fn bdrv_aligned_pwritev(BlockDriverState *bs, + int64_t offset, unsigned int bytes, QEMUIOVector *qiov, int flags) { BlockDriver *drv = bs->drv; BdrvTrackedRequest req; int ret; - if (!bs->drv) { - return -ENOMEDIUM; - } - if (bs->read_only) { - return -EACCES; - } - if (bdrv_check_request(bs, sector_num, nb_sectors)) { - return -EIO; - } - - if (bs->copy_on_read_in_flight) { - wait_for_overlapping_requests(bs, sector_num, nb_sectors); - } + int64_t sector_num = offset >> BDRV_SECTOR_BITS; + unsigned int nb_sectors = bytes >> BDRV_SECTOR_BITS; - /* throttling disk I/O */ - if (bs->io_limits_enabled) { - bdrv_io_limits_intercept(bs, nb_sectors, true); - } + assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0); + assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0); tracked_request_begin(&req, bs, sector_num, nb_sectors, true); @@ -3017,6 +3003,40 @@ static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, return ret; } +/* + * 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, + BdrvRequestFlags flags) +{ + int ret; + + if (!bs->drv) { + return -ENOMEDIUM; + } + if (bs->read_only) { + return -EACCES; + } + if (bdrv_check_request(bs, sector_num, nb_sectors)) { + return -EIO; + } + + if (bs->copy_on_read_in_flight) { + wait_for_overlapping_requests(bs, sector_num, nb_sectors); + } + + /* throttling disk I/O */ + if (bs->io_limits_enabled) { + bdrv_io_limits_intercept(bs, nb_sectors, true); + } + + ret = bdrv_aligned_pwritev(bs, sector_num << BDRV_SECTOR_BITS, + nb_sectors << BDRV_SECTOR_BITS, qiov, flags); + + return ret; +} + int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) { -- 1.8.1.4