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Re: [Qemu-block] [PATCH v2 02/13] block: Introduce bdrv_lock and bdrv_un
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-block] [PATCH v2 02/13] block: Introduce bdrv_lock and bdrv_unlock API |
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Date: |
Wed, 24 Jun 2015 11:14:50 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0 |
On 24/06/2015 04:47, Fam Zheng wrote:
>> > 2. Is this about thread safety? (No, it's about exclusive access to a
>> > BDS *within* the AioContext.)
> As it has to quiesce iothreads as well (for now it's even more urgent than
> exclusive access within the same AioContext), I'd rather take it as yes.
For now it's a "no", because there are no races between threads: the
main thread has acquired the AioContext and cut away the iothread.
However, as we move towards fine-grained AioContext critical sections,
it will become a "yes".
Paolo
- [Qemu-block] [PATCH v2 00/13] block: Protect block jobs with lock / unlock API, Fam Zheng, 2015/06/01
- [Qemu-block] [PATCH v2 03/13] blockdev: Lock BDS during internal snapshot transaction, Fam Zheng, 2015/06/01
- [Qemu-block] [PATCH v2 04/13] blockdev: Lock BDS during external snapshot transaction, Fam Zheng, 2015/06/01
- [Qemu-block] [PATCH v2 05/13] blockdev: Lock BDS during drive-backup transaction, Fam Zheng, 2015/06/01
- [Qemu-block] [PATCH v2 06/13] blockdev: Lock BDS during blockdev-backup transaction, Fam Zheng, 2015/06/01
- [Qemu-block] [PATCH v2 07/13] mirror: Protect source between bdrv_drain and bdrv_swap, Fam Zheng, 2015/06/01
- [Qemu-block] [PATCH v2 08/13] block: Add bdrv_add_lock_unlock_notifier, Fam Zheng, 2015/06/01
- [Qemu-block] [PATCH v2 09/13] block-backend: Add blk_add_lock_unlock_notifier, Fam Zheng, 2015/06/01
- [Qemu-block] [PATCH v2 10/13] virtio-blk: Move complete_request to 'ops' structure, Fam Zheng, 2015/06/01
- [Qemu-block] [PATCH v2 11/13] virtio-blk: Don't handle output when backend is locked, Fam Zheng, 2015/06/01