linux-kernel - Re: [PATCH] block: really remove REQ_NOWAIT

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Date:   Sun, 31 May 2020 19:39:36 +0300
From:   Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
To:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        Jens Axboe <axboe@...nel.dk>, Christoph Hellwig <hch@....de>
Subject: Re: [PATCH] block: really remove REQ_NOWAIT_INLINE

On 31/05/2020 19.33, Konstantin Khlebnikov wrote:
> Commit 7b6620d7db56 ("block: remove REQ_NOWAIT_INLINE") removed it,
> but some pieces left. Probably something went wrong with git merge.

Nevermind. As I see in block/for-next, Christoph have removed REQ_NOWAIT_INLINE.

But BLK_QC_T_EAGAIN is still here though.

> 
> Signed-off-by: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
> ---
>   include/linux/blk_types.h |    7 ++-----
>   1 file changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
> index 31eb92876be7..59b2e9bd9bd8 100644
> --- a/include/linux/blk_types.h
> +++ b/include/linux/blk_types.h
> @@ -322,8 +322,7 @@ enum req_flag_bits {
>   	__REQ_PREFLUSH,		/* request for cache flush */
>   	__REQ_RAHEAD,		/* read ahead, can fail anytime */
>   	__REQ_BACKGROUND,	/* background IO */
> -	__REQ_NOWAIT,           /* Don't wait if request will block */
> -	__REQ_NOWAIT_INLINE,	/* Return would-block error inline */
> +	__REQ_NOWAIT,		/* Don't wait if request will block */
>   	/*
>   	 * When a shared kthread needs to issue a bio for a cgroup, doing
>   	 * so synchronously can lead to priority inversions as the kthread
> @@ -358,7 +357,6 @@ enum req_flag_bits {
>   #define REQ_RAHEAD		(1ULL << __REQ_RAHEAD)
>   #define REQ_BACKGROUND		(1ULL << __REQ_BACKGROUND)
>   #define REQ_NOWAIT		(1ULL << __REQ_NOWAIT)
> -#define REQ_NOWAIT_INLINE	(1ULL << __REQ_NOWAIT_INLINE)
>   #define REQ_CGROUP_PUNT		(1ULL << __REQ_CGROUP_PUNT)
>   
>   #define REQ_NOUNMAP		(1ULL << __REQ_NOUNMAP)
> @@ -452,13 +450,12 @@ static inline int op_stat_group(unsigned int op)
>   
>   typedef unsigned int blk_qc_t;
>   #define BLK_QC_T_NONE		-1U
> -#define BLK_QC_T_EAGAIN		-2U
>   #define BLK_QC_T_SHIFT		16
>   #define BLK_QC_T_INTERNAL	(1U << 31)
>   
>   static inline bool blk_qc_t_valid(blk_qc_t cookie)
>   {
> -	return cookie != BLK_QC_T_NONE && cookie != BLK_QC_T_EAGAIN;
> +	return cookie != BLK_QC_T_NONE;
>   }
>   
>   static inline unsigned int blk_qc_t_to_queue_num(blk_qc_t cookie)
>