From: Vladimir Sementsov-Ogievskiy Date: Fri, 3 Sep 2021 10:28:04 +0000 (+0300) Subject: block/io: allow 64bit write-zeroes requests X-Git-Tag: v6.2.0-rc0~81^2~10 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=2aaa3f9b33afca9733700b94d764e45ac009b8e5;p=thirdparty%2Fqemu.git block/io: allow 64bit write-zeroes requests Now that all drivers are updated by previous commit, we can drop two last limiters on write-zeroes path: INT_MAX in bdrv_co_do_pwrite_zeroes() and bdrv_check_request32() in bdrv_co_pwritev_part(). Now everything is prepared for implementing incredibly cool and fast big-write-zeroes in NBD and qcow2. And any other driver which wants it of course. Signed-off-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Eric Blake Message-Id: <20210903102807.27127-9-vsementsov@virtuozzo.com> Signed-off-by: Eric Blake --- diff --git a/block/io.c b/block/io.c index 0090224603f..e40462742ea 100644 --- a/block/io.c +++ b/block/io.c @@ -1869,7 +1869,8 @@ static int coroutine_fn bdrv_co_do_pwrite_zeroes(BlockDriverState *bs, int head = 0; int tail = 0; - int64_t max_write_zeroes = MIN_NON_ZERO(bs->bl.max_pwrite_zeroes, INT_MAX); + int64_t max_write_zeroes = MIN_NON_ZERO(bs->bl.max_pwrite_zeroes, + INT64_MAX); int alignment = MAX(bs->bl.pwrite_zeroes_alignment, bs->bl.request_alignment); int max_transfer = MIN_NON_ZERO(bs->bl.max_transfer, MAX_BOUNCE_BUFFER); @@ -2248,7 +2249,11 @@ int coroutine_fn bdrv_co_pwritev_part(BdrvChild *child, return -ENOMEDIUM; } - ret = bdrv_check_request32(offset, bytes, qiov, qiov_offset); + if (flags & BDRV_REQ_ZERO_WRITE) { + ret = bdrv_check_qiov_request(offset, bytes, qiov, qiov_offset, NULL); + } else { + ret = bdrv_check_request32(offset, bytes, qiov, qiov_offset); + } if (ret < 0) { return ret; }