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Re: [Qemu-block] [Qemu-devel] [PATCH 3/9] block: Add BDRV_REQ_WRITE_UNCH
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From: |
Stefan Hajnoczi |
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Subject: |
Re: [Qemu-block] [Qemu-devel] [PATCH 3/9] block: Add BDRV_REQ_WRITE_UNCHANGED flag |
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Date: |
Fri, 20 Apr 2018 16:33:35 +0800 |
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User-agent: |
Mutt/1.9.2 (2017-12-15) |
On Mon, Apr 16, 2018 at 06:58:43PM +0200, Max Reitz wrote:
> This flag signifies that a write request will not change the visible
> disk content. With this flag set, it is sufficient to have the
> BLK_PERM_WRITE_UNCHANGED permission instead of BLK_PERM_WRITE.
>
> Signed-off-by: Max Reitz <address@hidden>
> ---
> include/block/block.h | 6 +++++-
> block/io.c | 6 +++++-
> 2 files changed, 10 insertions(+), 2 deletions(-)
Reviewed-by: Stefan Hajnoczi <address@hidden>
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- [Qemu-block] [PATCH 0/9] block: Add COR filter driver, Max Reitz, 2018/04/16
- [Qemu-block] [PATCH 1/9] block: Add COR filter driver, Max Reitz, 2018/04/16
- [Qemu-block] [PATCH 2/9] block: BLK_PERM_WRITE includes ..._UNCHANGED, Max Reitz, 2018/04/16
- [Qemu-block] [PATCH 3/9] block: Add BDRV_REQ_WRITE_UNCHANGED flag, Max Reitz, 2018/04/16
- [Qemu-block] [PATCH 5/9] block/quorum: Support BDRV_REQ_WRITE_UNCHANGED, Max Reitz, 2018/04/16
- [Qemu-block] [PATCH 4/9] block: Set BDRV_REQ_WRITE_UNCHANGED for COR writes, Max Reitz, 2018/04/16
- [Qemu-block] [PATCH 7/9] iotests: Clean up wrap image in 197, Max Reitz, 2018/04/16