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Date: Mon, 27 Mar 2017 13:34:17 +0200 From: Paolo Bonzini <pbonzini@...hat.com> To: Changpeng Liu <changpeng.liu@...el.com>, virtio-dev@...ts.oasis-open.org, virtualization@...ts.linux-foundation.org, linux-kernel@...r.kernel.org, hch@....de Cc: qemu-devel@...gnu.org Subject: Re: [virtio-dev] [PATCH] virtio-blk: add DISCARD support to virtio-blk driver On 28/03/2017 10:39, Changpeng Liu wrote: > + if (virtio_has_feature(vdev, VIRTIO_BLK_F_DISCARD)) { > + q->limits.discard_zeroes_data = 0; Maybe you could use another feature bit to populate discard_zeroes_data. Paolo > + q->limits.discard_alignment = blk_size; > + q->limits.discard_granularity = blk_size; > + blk_queue_max_discard_sectors(q, UINT_MAX); > + blk_queue_max_discard_segments(q, 1); > + queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); > + } > +
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