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Re: [Qemu-devel] [RFC PATCH 3/3] block: gluster as block backend
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [RFC PATCH 3/3] block: gluster as block backend |
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Date: |
Sun, 01 Jul 2012 16:50:29 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120605 Thunderbird/13.0 |
Il 19/06/2012 13:05, Stefan Hajnoczi ha scritto:
>> > I picked up this logic from block/raw-posix.c:raw_open_common(). Don't see
>> > anything related to bs->enable_write_cache there. Will find out more about
>> > bs->enable_write_cache.
> If you fetch the latest qemu.git and check bdrv_open_common() there is
> new code that stashes BDRV_O_CACHE_WB in bs->enable_write_cache and
> then opens the actual block driver with BDRV_O_CACHE_WB set. You can
> use bdrv_enable_write_cache() to test the original flag.
Yes, but you shouldn't do this when opening. You should always open for
writeback.
Paolo