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From: Matthew Wilcox <willy@infradead.org>
To: David Howells <dhowells@redhat.com>
Cc: Trond Myklebust <trondmy@hammerspace.com>,
	Anna Schumaker <anna.schumaker@netapp.com>,
	Steve French <sfrench@samba.org>,
	Dominique Martinet <asmadeus@codewreck.org>,
	Dave Wysochanski <dwysocha@redhat.com>,
	Jeff Layton <jlayton@redhat.com>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	linux-cachefs@redhat.com, linux-afs@lists.infradead.org,
	linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org,
	ceph-devel@vger.kernel.org, v9fs-developer@lists.sourceforge.net,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 32/32] NFS: Convert readpage to readahead and use netfs_readahead for fscache
Date: Tue, 26 Jan 2021 01:36:11 +0000	[thread overview]
Message-ID: <20210126013611.GI308988@casper.infradead.org> (raw)
In-Reply-To: <161161064956.2537118.3354798147866150631.stgit@warthog.procyon.org.uk>


For Subject: s/readpage/readpages/

On Mon, Jan 25, 2021 at 09:37:29PM +0000, David Howells wrote:
> +int __nfs_readahead_from_fscache(struct nfs_readdesc *desc,
> +				 struct readahead_control *rac)

I thought you wanted it called ractl instead of rac?  That's what I've
been using in new code.

> -	dfprintk(FSCACHE, "NFS: nfs_getpages_from_fscache (0x%p/%u/0x%p)\n",
> -		 nfs_i_fscache(inode), npages, inode);
> +	dfprintk(FSCACHE, "NFS: nfs_readahead_from_fscache (0x%p/0x%p)\n",
> +		 nfs_i_fscache(inode), inode);

We do have readahead_count() if this is useful information to be logging.

> +static inline int nfs_readahead_from_fscache(struct nfs_readdesc *desc,
> +					     struct readahead_control *rac)
>  {
> -	if (NFS_I(inode)->fscache)
> -		return __nfs_readpages_from_fscache(ctx, inode, mapping, pages,
> -						    nr_pages);
> +	if (NFS_I(rac->mapping->host)->fscache)
> +		return __nfs_readahead_from_fscache(desc, rac);
>  	return -ENOBUFS;
>  }

Not entirely sure that it's worth having the two functions separated any more.

>  	/* attempt to read as many of the pages as possible from the cache
>  	 * - this returns -ENOBUFS immediately if the cookie is negative
>  	 */
> -	ret = nfs_readpages_from_fscache(desc.ctx, inode, mapping,
> -					 pages, &nr_pages);
> +	ret = nfs_readahead_from_fscache(&desc, rac);
>  	if (ret == 0)
>  		goto read_complete; /* all pages were read */
>  
>  	nfs_pageio_init_read(&desc.pgio, inode, false,
>  			     &nfs_async_read_completion_ops);
>  
> -	ret = read_cache_pages(mapping, pages, readpage_async_filler, &desc);
> +	while ((page = readahead_page(rac))) {
> +		ret = readpage_async_filler(&desc, page);
> +		put_page(page);
> +	}

I thought with the new API we didn't need to do this kind of thing
any more?  ie no matter whether fscache is configured in or not, it'll
submit the I/Os.

  reply	other threads:[~2021-01-26 20:42 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-25 21:30 [PATCH 00/32] Network fs helper library & fscache kiocb API [ver #2] David Howells
2021-01-25 21:31 ` [PATCH 01/32] iov_iter: Add ITER_XARRAY David Howells
2021-01-25 21:31 ` [PATCH 02/32] vm: Add wait/unlock functions for PG_fscache David Howells
2021-01-25 21:31 ` [PATCH 03/32] mm: Implement readahead_control pageset expansion David Howells
2021-01-25 21:31 ` [PATCH 04/32] vfs: Export rw_verify_area() for use by cachefiles David Howells
2021-01-25 21:31 ` [PATCH 05/32] netfs: Make a netfs helper module David Howells
2021-01-25 21:32 ` [PATCH 06/32] netfs: Provide readahead and readpage netfs helpers David Howells
2021-01-25 21:32 ` [PATCH 07/32] netfs: Add tracepoints David Howells
2021-01-25 21:32 ` [PATCH 08/32] netfs: Gather stats David Howells
2021-01-25 21:32 ` [PATCH 09/32] netfs: Add write_begin helper David Howells
2021-01-25 21:32 ` [PATCH 10/32] netfs: Define an interface to talk to a cache David Howells
2021-01-25 21:32 ` [PATCH 11/32] fscache, cachefiles: Add alternate API to use kiocb for read/write to cache David Howells
2021-01-25 21:33 ` [PATCH 12/32] afs: Disable use of the fscache I/O routines David Howells
2021-01-25 21:33 ` [PATCH 13/32] afs: Pass page into dirty region helpers to provide THP size David Howells
2021-01-25 21:33 ` [PATCH 14/32] afs: Print the operation debug_id when logging an unexpected data version David Howells
2021-01-25 21:33 ` [PATCH 15/32] afs: Move key to afs_read struct David Howells
2021-01-25 21:34 ` [PATCH 16/32] afs: Don't truncate iter during data fetch David Howells
2021-01-25 21:34 ` [PATCH 17/32] afs: Log remote unmarshalling errors David Howells
2021-01-25 21:34 ` [PATCH 18/32] afs: Set up the iov_iter before calling afs_extract_data() David Howells
2021-01-25 21:34 ` [PATCH 19/32] afs: Use ITER_XARRAY for writing David Howells
2021-01-25 21:34 ` [PATCH 20/32] afs: Wait on PG_fscache before modifying/releasing a page David Howells
2021-01-25 21:35 ` [PATCH 21/32] afs: Extract writeback extension into its own function David Howells
2021-01-25 21:35 ` [PATCH 22/32] afs: Prepare for use of THPs David Howells
2021-01-25 21:35 ` [PATCH 23/32] afs: Use the fs operation ops to handle FetchData completion David Howells
2021-01-25 21:35 ` [PATCH 24/32] afs: Use new fscache read helper API David Howells
2021-01-25 21:35 ` [PATCH 25/32] NFS: Clean up nfs_readpage() and nfs_readpages() David Howells
2021-01-26  3:59   ` Matthew Wilcox
2021-01-26 15:33     ` David Wysochanski
2021-01-25 21:36 ` [PATCH 26/32] NFS: In nfs_readpage() only increment NFSIOS_READPAGES when read succeeds David Howells
2021-01-25 21:36 ` [PATCH 27/32] NFS: Refactor nfs_readpage() and nfs_readpage_async() to use nfs_readdesc David Howells
2021-01-26  4:05   ` Matthew Wilcox
2021-01-26 15:24     ` David Wysochanski
2021-01-25 21:36 ` [PATCH 28/32] NFS: Call readpage_async_filler() from nfs_readpage_async() David Howells
2021-01-25 21:36 ` [PATCH 29/32] NFS: Add nfs_pageio_complete_read() and remove nfs_readpage_async() David Howells
2021-01-25 21:37 ` [PATCH 30/32] NFS: Allow internal use of read structs and functions David Howells
2021-01-25 21:37 ` [PATCH 31/32] NFS: Convert to the netfs API and nfs_readpage to use netfs_readpage David Howells
2021-01-25 21:37 ` [PATCH 32/32] NFS: Convert readpage to readahead and use netfs_readahead for fscache David Howells
2021-01-26  1:36   ` Matthew Wilcox [this message]
2021-01-26 15:24     ` Chuck Lever
2021-01-26 19:10       ` David Wysochanski
2021-01-26 18:25     ` David Wysochanski

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