linux-kernel - Re: [PATCH 07/11] vfs: add nowait parameter for file

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Message-ID: <ZOvA5DJDZN0FRymp@casper.infradead.org>
Date:   Sun, 27 Aug 2023 22:32:20 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Hao Xu <hao.xu@...ux.dev>
Cc:     io-uring@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Pavel Begunkov <asml.silence@...il.com>,
        Christian Brauner <brauner@...nel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Stefan Roesch <shr@...com>, Clay Harris <bugs@...ycon.org>,
        Dave Chinner <david@...morbit.com>,
        "Darrick J . Wong" <djwong@...nel.org>,
        linux-fsdevel@...r.kernel.org, linux-xfs@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-cachefs@...hat.com,
        ecryptfs@...r.kernel.org, linux-nfs@...r.kernel.org,
        linux-unionfs@...r.kernel.org, bpf@...r.kernel.org,
        netdev@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-btrfs@...r.kernel.org, codalist@...a.cs.cmu.edu,
        linux-f2fs-devel@...ts.sourceforge.net, cluster-devel@...hat.com,
        linux-mm@...ck.org, linux-nilfs@...r.kernel.org,
        devel@...ts.orangefs.org, linux-cifs@...r.kernel.org,
        samba-technical@...ts.samba.org, linux-mtd@...ts.infradead.org,
        Wanpeng Li <wanpengli@...cent.com>
Subject: Re: [PATCH 07/11] vfs: add nowait parameter for file_accessed()

On Sun, Aug 27, 2023 at 09:28:31PM +0800, Hao Xu wrote:
> From: Hao Xu <howeyxu@...cent.com>
> 
> Add a boolean parameter for file_accessed() to support nowait semantics.
> Currently it is true only with io_uring as its initial caller.

So why do we need to do this as part of this series?  Apparently it
hasn't caused any problems for filemap_read().

> +++ b/mm/filemap.c
> @@ -2723,7 +2723,7 @@ ssize_t filemap_read(struct kiocb *iocb, struct iov_iter *iter,
>  		folio_batch_init(&fbatch);
>  	} while (iov_iter_count(iter) && iocb->ki_pos < isize && !error);
>  
> -	file_accessed(filp);
> +	file_accessed(filp, false);
>  
>  	return already_read ? already_read : error;
>  }
> @@ -2809,7 +2809,7 @@ generic_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
>  		retval = kiocb_write_and_wait(iocb, count);
>  		if (retval < 0)
>  			return retval;
> -		file_accessed(file);
> +		file_accessed(file, false);
>  
>  		retval = mapping->a_ops->direct_IO(iocb, iter);
>  		if (retval >= 0) {
> @@ -2978,7 +2978,7 @@ ssize_t filemap_splice_read(struct file *in, loff_t *ppos,
>  
>  out:
>  	folio_batch_release(&fbatch);
> -	file_accessed(in);
> +	file_accessed(in, false);
>  
>  	return total_spliced ? total_spliced : error;
>  }