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List:       linux-api
Subject:    Re: [PATCH 03/10] fs: Use RWF_* flags for AIO operations
From:       Jan Kara <jack () suse ! cz>
Date:       2017-05-25 8:27:45
Message-ID: 20170525082745.GD28950 () quack2 ! suse ! cz
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On Wed 24-05-17 11:41:43, Goldwyn Rodrigues wrote:
> From: Goldwyn Rodrigues <rgoldwyn@suse.com>
> 
> aio_rw_flags is introduced in struct iocb (using aio_reserved1) which will
> carry the RWF_* flags. We cannot use aio_flags because they are not
> checked for validity which may break existing applications.
> 
> Note, the only place RWF_HIPRI comes in effect is dio_await_one().
> All the rest of the locations, aio code return -EIOCBQUEUED before the
> checks for RWF_HIPRI.
> 
> Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
> Reviewed-by: Christoph Hellwig <hch@lst.de>

Looks good. You can add:

Reviewed-by: Jan Kara <jack@suse.cz>

								Honza

> ---
>  fs/aio.c                     | 8 +++++++-
>  include/uapi/linux/aio_abi.h | 2 +-
>  2 files changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/aio.c b/fs/aio.c
> index f52d925ee259..020fa0045e3c 100644
> --- a/fs/aio.c
> +++ b/fs/aio.c
> @@ -1541,7 +1541,7 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
>  	ssize_t ret;
>  
>  	/* enforce forwards compatibility on users */
> -	if (unlikely(iocb->aio_reserved1 || iocb->aio_reserved2)) {
> +	if (unlikely(iocb->aio_reserved2)) {
>  		pr_debug("EINVAL: reserve field set\n");
>  		return -EINVAL;
>  	}
> @@ -1586,6 +1586,12 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
>  		req->common.ki_flags |= IOCB_EVENTFD;
>  	}
>  
> +	ret = kiocb_set_rw_flags(&req->common, iocb->aio_rw_flags);
> +	if (unlikely(ret)) {
> +		pr_debug("EINVAL: aio_rw_flags\n");
> +		goto out_put_req;
> +	}
> +
>  	ret = put_user(KIOCB_KEY, &user_iocb->aio_key);
>  	if (unlikely(ret)) {
>  		pr_debug("EFAULT: aio_key\n");
> diff --git a/include/uapi/linux/aio_abi.h b/include/uapi/linux/aio_abi.h
> index bb2554f7fbd1..a2d4a8ac94ca 100644
> --- a/include/uapi/linux/aio_abi.h
> +++ b/include/uapi/linux/aio_abi.h
> @@ -79,7 +79,7 @@ struct io_event {
>  struct iocb {
>  	/* these are internal to the kernel/libc. */
>  	__u64	aio_data;	/* data to be returned in event's data */
> -	__u32	PADDED(aio_key, aio_reserved1);
> +	__u32	PADDED(aio_key, aio_rw_flags);
>  				/* the kernel sets aio_key to the req # */
>  
>  	/* common fields */
> -- 
> 2.12.0
> 
-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR
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