From: Eric Blake <eblake@redhat.com>
To: Anton Nefedov <anton.nefedov@virtuozzo.com>, qemu-devel@nongnu.org
Cc: qemu-block@nongnu.org, kwolf@redhat.com, mreitz@redhat.com,
den@virtuozzo.com, berto@igalia.com
Subject: Re: [Qemu-devel] [PATCH v6 4/9] block: treat BDRV_REQ_ALLOCATE as serialising
Date: Tue, 16 Jan 2018 14:43:28 -0600 [thread overview]
Message-ID: <45a18aa0-113b-a87e-39ee-97beb205c922@redhat.com> (raw)
In-Reply-To: <1516107870-8110-5-git-send-email-anton.nefedov@virtuozzo.com>
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On 01/16/2018 07:04 AM, Anton Nefedov wrote:
> The idea is that ALLOCATE requests may overlap with other requests.
> Reuse the existing block layer infrastructure for serialising requests.
> Use the following approach:
> - mark ALLOCATE serialising, so subsequent requests to the area wait
> - ALLOCATE request itself must never wait if another request is in flight
> already. Return EAGAIN, let the caller reconsider.
>
> Signed-off-by: Anton Nefedov <anton.nefedov@virtuozzo.com>
> ---
> block/io.c | 27 +++++++++++++++++++--------
> 1 file changed, 19 insertions(+), 8 deletions(-)
>
Reviewed-by: Eric Blake <eblake@redhat.com>
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3266
Virtualization: qemu.org | libvirt.org
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next prev parent reply other threads:[~2018-01-16 20:43 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-16 13:04 [Qemu-devel] [PATCH v6 0/9] qcow2: cluster space preallocation Anton Nefedov
2018-01-16 13:04 ` [Qemu-devel] [PATCH v6 1/9] mirror: inherit supported write/zero flags Anton Nefedov
2018-01-16 13:04 ` [Qemu-devel] [PATCH v6 2/9] blkverify: set " Anton Nefedov
2018-01-16 13:04 ` [Qemu-devel] [PATCH v6 3/9] block: introduce BDRV_REQ_ALLOCATE flag Anton Nefedov
2018-01-16 13:04 ` [Qemu-devel] [PATCH v6 4/9] block: treat BDRV_REQ_ALLOCATE as serialising Anton Nefedov
2018-01-16 20:43 ` Eric Blake [this message]
2018-01-16 13:04 ` [Qemu-devel] [PATCH v6 5/9] file-posix: support BDRV_REQ_ALLOCATE Anton Nefedov
2018-01-16 13:04 ` [Qemu-devel] [PATCH v6 6/9] block: support BDRV_REQ_ALLOCATE in passthrough drivers Anton Nefedov
2018-01-16 13:04 ` [Qemu-devel] [PATCH v6 7/9] qcow2: move is_zero() up Anton Nefedov
2018-01-16 13:04 ` [Qemu-devel] [PATCH v6 8/9] qcow2: skip writing zero buffers to empty COW areas Anton Nefedov
2018-01-16 16:11 ` Alberto Garcia
2018-01-17 14:12 ` Anton Nefedov
2018-01-16 13:04 ` [Qemu-devel] [PATCH v6 9/9] iotest 134: test cluster-misaligned encrypted write Anton Nefedov
2018-01-16 20:45 ` Eric Blake
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