linux-kernel - Re: [PATCH 3/6] direct-io: add support for write stream IDs

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Message-ID: <20150325024328.GF31342@dastard>
Date:	Wed, 25 Mar 2015 13:43:28 +1100
From:	Dave Chinner <david@...morbit.com>
To:	Jens Axboe <axboe@...com>
Cc:	axboe@...nel.dk, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, ming.l@....samsung.com
Subject: Re: [PATCH 3/6] direct-io: add support for write stream IDs

On Tue, Mar 24, 2015 at 09:27:00AM -0600, Jens Axboe wrote:
> Get the streamid from the file, if any, and set it on the bio.
> 
> Signed-off-by: Jens Axboe <axboe@...com>
> ---
>  fs/direct-io.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/fs/direct-io.c b/fs/direct-io.c
> index e181b6b2e297..5d2750346451 100644
> --- a/fs/direct-io.c
> +++ b/fs/direct-io.c
> @@ -77,6 +77,7 @@ struct dio_submit {
>  	int reap_counter;		/* rate limit reaping */
>  	sector_t final_block_in_request;/* doesn't change */
>  	int boundary;			/* prev block is at a boundary */
> +	int streamid;			/* Write stream ID */
>  	get_block_t *get_block;		/* block mapping function */
>  	dio_submit_t *submit_io;	/* IO submition function */
>  
> @@ -372,6 +373,8 @@ dio_bio_alloc(struct dio *dio, struct dio_submit *sdio,
>  
>  	sdio->bio = bio;
>  	sdio->logical_offset_in_bio = sdio->cur_page_fs_offset;
> +
> +	bio_set_streamid(bio, sdio->streamid);
>  }
>  
>  /*
> @@ -1205,6 +1208,7 @@ do_blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
>  	sdio.blkbits = blkbits;
>  	sdio.blkfactor = i_blkbits - blkbits;
>  	sdio.block_in_file = offset >> blkbits;
> +	sdio.streamid = iocb->ki_filp->f_streamid;

If iocb->ki_filp->f_streamid is not set, then it should fall back to
whatever is set on the inode->i_streamid.

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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