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Re: [Qemu-block] [PATCH v6 05/20] block: Introduce byte-based aio read/w
From: |
Kevin Wolf |
Subject: |
Re: [Qemu-block] [PATCH v6 05/20] block: Introduce byte-based aio read/write |
Date: |
Fri, 6 May 2016 14:31:29 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
Am 05.05.2016 um 01:55 hat Eric Blake geschrieben:
> blk_aio_readv() and blk_aio_writev() are annoying in that they
> can't access sub-sector granularity, and cannot pass flags.
> Also, they require the caller to pass redundant information
> about the size of the I/O.
>
> Add new blk_aio_preadv() and blk_aio_pwritev() functions to fix
> the flaws. The next few patches will upgrade callers, then
> finally delete the old interfaces.
>
> Signed-off-by: Eric Blake <address@hidden>
> ---
> include/sysemu/block-backend.h | 6 ++++++
> block/block-backend.c | 16 ++++++++++++++++
> 2 files changed, 22 insertions(+)
>
> diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
> index 851376b..8d7839c 100644
> --- a/include/sysemu/block-backend.h
> +++ b/include/sysemu/block-backend.h
> @@ -110,9 +110,15 @@ int64_t blk_nb_sectors(BlockBackend *blk);
> BlockAIOCB *blk_aio_readv(BlockBackend *blk, int64_t sector_num,
> QEMUIOVector *iov, int nb_sectors,
> BlockCompletionFunc *cb, void *opaque);
> +BlockAIOCB *blk_aio_preadv(BlockBackend *blk, int64_t offset,
> + QEMUIOVector *iov, BdrvRequestFlags flags,
If you have to respin for some reason, I think QEMUIOVectors are
commonly called qiov, whereas iov is usually the name for struct iovec.
Kevin
- [Qemu-block] [PATCH v6 00/20] block: kill sector-based blk_write/read, Eric Blake, 2016/05/04
- [Qemu-block] [PATCH v6 02/20] block: Drop private ioctl-only members of BlockRequest, Eric Blake, 2016/05/04
- [Qemu-block] [PATCH v6 03/20] block: Switch blk_read_unthrottled() to byte interface, Eric Blake, 2016/05/04
- [Qemu-block] [PATCH v6 04/20] block: Switch blk_*write_zeroes() to byte interface, Eric Blake, 2016/05/04
- [Qemu-block] [PATCH v6 05/20] block: Introduce byte-based aio read/write, Eric Blake, 2016/05/04
- Re: [Qemu-block] [PATCH v6 05/20] block: Introduce byte-based aio read/write,
Kevin Wolf <=
- [Qemu-block] [PATCH v6 06/20] ide: Switch to byte-based aio block access, Eric Blake, 2016/05/04
- [Qemu-block] [PATCH v6 07/20] scsi-disk: Switch to byte-based aio block access, Eric Blake, 2016/05/04
- [Qemu-block] [PATCH v6 01/20] block: Allow BDRV_REQ_FUA through blk_pwrite(), Eric Blake, 2016/05/04
- [Qemu-block] [PATCH v6 08/20] virtio: Switch to byte-based aio block access, Eric Blake, 2016/05/04
- [Qemu-block] [PATCH v6 09/20] xen_disk: Switch to byte-based aio block access, Eric Blake, 2016/05/04
- [Qemu-block] [PATCH v6 10/20] fdc: Switch to byte-based block access, Eric Blake, 2016/05/04