From: Stefan Hajnoczi <stefanha@gmail.com>
To: Peter Lieven <pl@kamp.de>
Cc: kwolf@redhat.com, stefanha@redhat.com, qemu-devel@nongnu.org,
anthony@codemonkey.ws, pbonzini@redhat.com,
ronniesahlberg@gmail.com
Subject: Re: [Qemu-devel] [PATCHv3 08/20] block: honour BlockLimits in bdrv_co_discard
Date: Mon, 7 Oct 2013 10:29:32 +0200 [thread overview]
Message-ID: <20131007082932.GC6254@stefanha-thinkpad.redhat.com> (raw)
In-Reply-To: <1380029714-5239-9-git-send-email-pl@kamp.de>
On Tue, Sep 24, 2013 at 03:35:02PM +0200, Peter Lieven wrote:
> @@ -4245,7 +4250,37 @@ int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num,
> }
>
> if (bs->drv->bdrv_co_discard) {
> - return bs->drv->bdrv_co_discard(bs, sector_num, nb_sectors);
> + int max_discard = bs->bl.max_discard ?
> + bs->bl.max_discard : MAX_DISCARD_DEFAULT;
> +
> + while (nb_sectors > 0) {
> + int ret;
> + int num = nb_sectors;
> +
> + /* align request */
> + if (bs->bl.discard_alignment &&
> + num >= bs->bl.discard_alignment &&
> + sector_num % bs->bl.discard_alignment) {
> + if (num > bs->bl.discard_alignment) {
> + num = bs->bl.discard_alignment;
> + }
> + num -= sector_num % bs->bl.discard_alignment;
> + }
Is it always possible to discard at arbitrary sector offsets?
next prev parent reply other threads:[~2013-10-07 8:29 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-24 13:34 [Qemu-devel] [PATCHv3 00/20] block: logical block provisioning enhancements Peter Lieven
2013-09-24 13:34 ` [Qemu-devel] [PATCHv3 01/20] block: make BdrvRequestFlags public Peter Lieven
2013-09-24 13:34 ` [Qemu-devel] [PATCHv3 02/20] block: add flags to bdrv_*_write_zeroes Peter Lieven
2013-10-02 15:32 ` Eric Blake
2013-09-24 13:34 ` [Qemu-devel] [PATCHv3 03/20] block: introduce BDRV_REQ_MAY_UNMAP request flag Peter Lieven
2013-09-24 13:34 ` [Qemu-devel] [PATCHv3 04/20] block: introduce bdrv_has_discard_zeroes and bdrv_has_discard_write_zeroes Peter Lieven
2013-10-02 15:41 ` Eric Blake
2013-09-24 13:34 ` [Qemu-devel] [PATCHv3 05/20] block/raw: add " Peter Lieven
2013-10-02 15:43 ` Eric Blake
2013-09-24 13:35 ` [Qemu-devel] [PATCHv3 06/20] block: add BlockLimits structure to BlockDriverState Peter Lieven
2013-10-02 15:53 ` Eric Blake
2013-10-07 8:10 ` Stefan Hajnoczi
2013-09-24 13:35 ` [Qemu-devel] [PATCHv3 07/20] block: honour BlockLimits in bdrv_co_do_write_zeroes Peter Lieven
2013-10-02 16:37 ` Eric Blake
2013-09-24 13:35 ` [Qemu-devel] [PATCHv3 08/20] block: honour BlockLimits in bdrv_co_discard Peter Lieven
2013-10-02 16:41 ` Eric Blake
2013-10-07 8:29 ` Stefan Hajnoczi [this message]
2013-10-07 8:36 ` Peter Lieven
2013-09-24 13:35 ` [Qemu-devel] [PATCHv3 09/20] iscsi: simplify iscsi_co_discard Peter Lieven
2013-09-24 13:35 ` [Qemu-devel] [PATCHv3 10/20] iscsi: set limits in BlockDriverState Peter Lieven
2013-10-02 16:43 ` Eric Blake
2013-09-24 13:35 ` [Qemu-devel] [PATCHv3 11/20] iscsi: add bdrv_has_discard_zeroes and bdrv_has_discard_write_zeroes Peter Lieven
2013-10-02 16:45 ` Eric Blake
2013-09-24 13:35 ` [Qemu-devel] [PATCHv3 12/20] iscsi: add bdrv_co_write_zeroes Peter Lieven
2013-09-24 13:35 ` [Qemu-devel] [PATCHv3 13/20] block: introduce bdrv_zeroize Peter Lieven
2013-10-02 16:51 ` Eric Blake
2013-10-07 8:34 ` Stefan Hajnoczi
2013-10-07 8:39 ` Peter Lieven
2013-09-24 13:35 ` [Qemu-devel] [PATCHv3 14/20] block/get_block_status: set *pnum = 0 on error Peter Lieven
2013-09-24 13:35 ` [Qemu-devel] [PATCHv3 15/20] block/get_block_status: avoid segfault if there is no backing_hd Peter Lieven
2013-09-24 13:35 ` [Qemu-devel] [PATCHv3 16/20] block/get_block_status: avoid redundant callouts on raw devices Peter Lieven
2013-09-24 13:35 ` [Qemu-devel] [PATCHv3 17/20] block/get_block_status: fix BDRV_BLOCK_ZERO for unallocated blocks Peter Lieven
2013-09-24 13:35 ` [Qemu-devel] [PATCHv3 18/20] qemu-img: add support for fully allocated images Peter Lieven
2013-10-02 17:01 ` Eric Blake
2013-09-24 13:35 ` [Qemu-devel] [PATCHv3 19/20] qemu-img: conditionally zero out target on convert Peter Lieven
2013-09-24 13:35 ` [Qemu-devel] [PATCHv3 20/20] block/raw: copy BlockLimits on raw_open Peter Lieven
2013-10-02 17:11 ` Eric Blake
2013-10-07 8:38 ` Stefan Hajnoczi
2013-10-07 8:40 ` Peter Lieven
2013-10-07 8:42 ` [Qemu-devel] [PATCHv3 00/20] block: logical block provisioning enhancements Stefan Hajnoczi
2013-10-07 8:47 ` Peter Lieven
2013-10-07 9:42 ` Paolo Bonzini
2013-10-08 7:02 ` Stefan Hajnoczi
2013-10-08 8:01 ` Peter Lieven
2013-10-08 8:59 ` Stefan Hajnoczi
2013-10-08 9:12 ` Peter Lieven
2013-10-08 9:26 ` Stefan Hajnoczi
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