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From: Alberto Garcia <berto@igalia.com>
To: Anton Nefedov <anton.nefedov@virtuozzo.com>, qemu-devel@nongnu.org
Cc: qemu-block@nongnu.org, kwolf@redhat.com, mreitz@redhat.com,
	eblake@redhat.com, den@virtuozzo.com
Subject: Re: [Qemu-devel] [PATCH v9 4/9] block: introduce BDRV_REQ_ALLOCATE flag
Date: Mon, 14 May 2018 12:29:55 +0200	[thread overview]
Message-ID: <w51y3gmcyxo.fsf@maestria.local.igalia.com> (raw)
In-Reply-To: <1525791496-125188-5-git-send-email-anton.nefedov@virtuozzo.com>

On Tue 08 May 2018 04:58:11 PM CEST, Anton Nefedov wrote:
> The flag is supposed to indicate that the region of the disk image has
> to be sufficiently allocated so it reads as zeroes.
>
> The call with the flag set must return -ENOTSUP if allocation cannot
> be done efficiently.
> This has to be made sure of by both
>   - the drivers that support the flag
>   - and the common block layer (so it will not fall back to any slowpath
>     (like writing zero buffers) in case the driver does not support
>     the flag).
>
> Signed-off-by: Anton Nefedov <anton.nefedov@virtuozzo.com>

Reviewed-by: Alberto Garcia <berto@igalia.com>

Berto

  reply	other threads:[~2018-05-14 10:30 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-08 14:58 [Qemu-devel] [PATCH v9 0/9] qcow2: cluster space preallocation Anton Nefedov
2018-05-08 14:58 ` [Qemu-devel] [PATCH v9 1/9] mirror: inherit supported write/zero flags Anton Nefedov
2018-05-15 14:35   ` Eric Blake
2018-05-15 14:59     ` Anton Nefedov
2018-05-08 14:58 ` [Qemu-devel] [PATCH v9 2/9] blkverify: set " Anton Nefedov
2018-05-15 14:37   ` Eric Blake
2018-05-08 14:58 ` [Qemu-devel] [PATCH v9 3/9] quorum: " Anton Nefedov
2018-05-15 14:38   ` Eric Blake
2018-05-08 14:58 ` [Qemu-devel] [PATCH v9 4/9] block: introduce BDRV_REQ_ALLOCATE flag Anton Nefedov
2018-05-14 10:29   ` Alberto Garcia [this message]
2018-05-08 14:58 ` [Qemu-devel] [PATCH v9 5/9] block: treat BDRV_REQ_ALLOCATE as serialising Anton Nefedov
2018-05-08 14:58 ` [Qemu-devel] [PATCH v9 6/9] file-posix: support BDRV_REQ_ALLOCATE Anton Nefedov
2018-05-14 11:50   ` Alberto Garcia
2018-05-08 14:58 ` [Qemu-devel] [PATCH v9 7/9] block: support BDRV_REQ_ALLOCATE in passthrough drivers Anton Nefedov
2018-05-08 14:58 ` [Qemu-devel] [PATCH v9 8/9] qcow2: skip writing zero buffers to empty COW areas Anton Nefedov
2018-05-14 13:09   ` Alberto Garcia
2018-05-08 14:58 ` [Qemu-devel] [PATCH v9 9/9] iotest 134: test cluster-misaligned encrypted write Anton Nefedov

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