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From: Christoph Hellwig <hch@lst.de>
To: Ryan Harper <ryanh@us.ibm.com>
Cc: Christoph Hellwig <hch@lst.de>, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 2/3] block: tell drivers about an image resize
Date: Mon, 17 Jan 2011 10:14:46 +0100	[thread overview]
Message-ID: <20110117091446.GA19062@lst.de> (raw)
In-Reply-To: <20110114210611.GI6249@us.ibm.com>

> Do we want to check to ensure the size_changed flag isn't set before
> doing a second resize event?  I'm wondering if the truncate takes
> $longtime and user gets impatient and issues a second resize command.
> How should we respond?  Ignore it?  queue it up? 

The truncate is synchronous and the monitor command won't return before
it's done.  The interfact might be a bit cleaner if we'd just pass the
reason for the change callback as another argument.  I'll do that for
the next respin.

> Is there any other path that invokes bdrv_truncate?  If so, do we want
> invoke the call back in those scenarios or only if the truncate is
> initiated from the monitor invocation?

Currently only the qemu-img and qemu-io tools invooke bdrv_truncate.
But if we grow new users we should always tell the driver/guest about it
so that it knows about the size change.

  reply	other threads:[~2011-01-17  9:14 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-01-14 16:20 [Qemu-devel] [PATCH 0/3] allow online resizing of block devices Christoph Hellwig
2011-01-14 16:20 ` [Qemu-devel] [PATCH 1/3] block: add resize monitor command Christoph Hellwig
2011-01-17 11:28   ` Stefan Hajnoczi
2011-01-17 15:59     ` Christoph Hellwig
2011-01-17 17:36   ` Kevin Wolf
2011-01-18 12:28     ` Christoph Hellwig
2011-01-19 15:35     ` Christoph Hellwig
2011-01-19 15:49       ` Kevin Wolf
2011-01-19 15:52         ` Christoph Hellwig
2011-01-19 16:01           ` Kevin Wolf
2011-01-19 16:31             ` Christoph Hellwig
2011-01-14 16:21 ` [Qemu-devel] [PATCH 2/3] block: tell drivers about an image resize Christoph Hellwig
2011-01-14 21:06   ` Ryan Harper
2011-01-17  9:14     ` Christoph Hellwig [this message]
2011-01-14 16:21 ` [Qemu-devel] [PATCH 3/3] virtio-blk: tell the guest about size changes Christoph Hellwig
2011-01-18 12:35 ` [Qemu-devel] [PATCH 0/3] allow online resizing of block devices Luiz Capitulino
2011-01-18 12:48   ` Christoph Hellwig
2011-01-18 13:17     ` Luiz Capitulino
2011-01-19 17:02 [Qemu-devel] [PATCH 0/3 v2] " Christoph Hellwig
2011-01-19 17:02 ` [Qemu-devel] [PATCH 2/3] block: tell drivers about an image resize Christoph Hellwig
2011-01-20  9:14   ` Stefan Hajnoczi
2011-01-20  9:44     ` Christoph Hellwig
2011-01-21 10:41   ` Kevin Wolf
2011-01-24 12:32 [Qemu-devel] [PATCH 0/3 v3] allow online resizing of block devices Christoph Hellwig
2011-01-24 12:32 ` [Qemu-devel] [PATCH 2/3] block: tell drivers about an image resize Christoph Hellwig

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