linux-kernel - Re: [RFC PATCH 03/53] netfs: Note nonblockingness in the netfs_io

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Message-ID: <a07c64e179e30c0962094eea5d1282977c4a4d90.camel@kernel.org>
Date:   Mon, 16 Oct 2023 11:44:54 -0400
From:   Jeff Layton <jlayton@...nel.org>
To:     David Howells <dhowells@...hat.com>,
        Steve French <smfrench@...il.com>
Cc:     Matthew Wilcox <willy@...radead.org>,
        Marc Dionne <marc.dionne@...istor.com>,
        Paulo Alcantara <pc@...guebit.com>,
        Ronnie Sahlberg <lsahlber@...hat.com>,
        Shyam Prasad N <sprasad@...rosoft.com>,
        Tom Talpey <tom@...pey.com>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Ilya Dryomov <idryomov@...il.com>,
        Christian Brauner <christian@...uner.io>,
        linux-afs@...ts.infradead.org, linux-cifs@...r.kernel.org,
        linux-nfs@...r.kernel.org, ceph-devel@...r.kernel.org,
        v9fs@...ts.linux.dev, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-cachefs@...hat.com
Subject: Re: [RFC PATCH 03/53] netfs: Note nonblockingness in the
 netfs_io_request struct

On Fri, 2023-10-13 at 16:56 +0100, David Howells wrote:
> Allow O_NONBLOCK to be noted in the netfs_io_request struct.  Also add a
> flag, NETFS_RREQ_BLOCKED to record if we did block.
> 
> Signed-off-by: David Howells <dhowells@...hat.com>
> cc: Jeff Layton <jlayton@...nel.org>
> cc: linux-cachefs@...hat.com
> cc: linux-fsdevel@...r.kernel.org
> cc: linux-mm@...ck.org
> ---
>  fs/netfs/objects.c    | 2 ++
>  include/linux/netfs.h | 2 ++
>  2 files changed, 4 insertions(+)
> 
> diff --git a/fs/netfs/objects.c b/fs/netfs/objects.c
> index 85f428fc52e6..e41f9fc9bdd2 100644
> --- a/fs/netfs/objects.c
> +++ b/fs/netfs/objects.c
> @@ -37,6 +37,8 @@ struct netfs_io_request *netfs_alloc_request(struct address_space *mapping,
>  	INIT_LIST_HEAD(&rreq->subrequests);
>  	refcount_set(&rreq->ref, 1);
>  	__set_bit(NETFS_RREQ_IN_PROGRESS, &rreq->flags);
> +	if (file && file->f_flags & O_NONBLOCK)
> +		__set_bit(NETFS_RREQ_NONBLOCK, &rreq->flags);
>  	if (rreq->netfs_ops->init_request) {
>  		ret = rreq->netfs_ops->init_request(rreq, file);
>  		if (ret < 0) {
> diff --git a/include/linux/netfs.h b/include/linux/netfs.h
> index 282511090ead..b92e982ac4a0 100644
> --- a/include/linux/netfs.h
> +++ b/include/linux/netfs.h
> @@ -205,6 +205,8 @@ struct netfs_io_request {
>  #define NETFS_RREQ_DONT_UNLOCK_FOLIOS	3	/* Don't unlock the folios on completion */
>  #define NETFS_RREQ_FAILED		4	/* The request failed */
>  #define NETFS_RREQ_IN_PROGRESS		5	/* Unlocked when the request completes */
> +#define NETFS_RREQ_NONBLOCK		6	/* Don't block if possible (O_NONBLOCK) */
> +#define NETFS_RREQ_BLOCKED		7	/* We blocked */
>  	const struct netfs_request_ops *netfs_ops;
>  };
>  
> 

I'd prefer to see this patch squashed in with the first patches that
actually check for these flags. I can't look at this patch alone and
tell how it'll be used.

-- 
Jeff Layton <jlayton@...nel.org>