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From: Jeff Layton <jlayton@redhat.com>
To: David Howells <dhowells@redhat.com>, linux-fsdevel@vger.kernel.org
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>,
	Anna Schumaker <anna.schumaker@netapp.com>,
	Steve French <sfrench@samba.org>,
	Dominique Martinet <asmadeus@codewreck.org>,
	Mike Marshall <hubcap@omnibond.com>,
	David Wysochanski <dwysocha@redhat.com>,
	Shyam Prasad N <nspmangalore@gmail.com>,
	Miklos Szeredi <miklos@szeredi.hu>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	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,
	devel@lists.orangefs.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH 02/12] netfs: Add an iov_iter to the read subreq for the network fs/cache to use
Date: Wed, 21 Jul 2021 13:16:56 -0400	[thread overview]
Message-ID: <0555748529d483fb9b69eceb56bf9ebc1efceaf1.camel@redhat.com> (raw)
In-Reply-To: <162687509306.276387.7579641363406546284.stgit@warthog.procyon.org.uk>

On Wed, 2021-07-21 at 14:44 +0100, David Howells wrote:
> Add an iov_iter to the read subrequest and set it up to define the
> destination buffer to write into.  This will allow future patches to point
> to a bounce buffer instead for purposes of handling oversize writes,
> decryption (where we want to save the encrypted data to the cache) and
> decompression.
> 
> Signed-off-by: David Howells <dhowells@redhat.com>
> ---
> 
>  fs/afs/file.c          |    6 +-----
>  fs/netfs/read_helper.c |    5 ++++-
>  include/linux/netfs.h  |    2 ++
>  3 files changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/fs/afs/file.c b/fs/afs/file.c
> index c9c21ad0e7c9..ca529f23515a 100644
> --- a/fs/afs/file.c
> +++ b/fs/afs/file.c
> @@ -319,11 +319,7 @@ static void afs_req_issue_op(struct netfs_read_subrequest *subreq)
>  	fsreq->len	= subreq->len   - subreq->transferred;
>  	fsreq->key	= subreq->rreq->netfs_priv;
>  	fsreq->vnode	= vnode;
> -	fsreq->iter	= &fsreq->def_iter;
> -
> -	iov_iter_xarray(&fsreq->def_iter, READ,
> -			&fsreq->vnode->vfs_inode.i_mapping->i_pages,
> -			fsreq->pos, fsreq->len);
> +	fsreq->iter	= &subreq->iter;
>  
>  	afs_fetch_data(fsreq->vnode, fsreq);
>  }
> diff --git a/fs/netfs/read_helper.c b/fs/netfs/read_helper.c
> index 0b6cd3b8734c..715f3e9c380d 100644
> --- a/fs/netfs/read_helper.c
> +++ b/fs/netfs/read_helper.c
> @@ -150,7 +150,7 @@ static void netfs_clear_unread(struct netfs_read_subrequest *subreq)
>  {
>  	struct iov_iter iter;
>  
> -	iov_iter_xarray(&iter, WRITE, &subreq->rreq->mapping->i_pages,
> +	iov_iter_xarray(&iter, READ, &subreq->rreq->mapping->i_pages,

What's up with the WRITE -> READ change here? Was that a preexisting
bug?

>  			subreq->start + subreq->transferred,
>  			subreq->len   - subreq->transferred);
>  	iov_iter_zero(iov_iter_count(&iter), &iter);
> @@ -745,6 +745,9 @@ netfs_rreq_prepare_read(struct netfs_read_request *rreq,
>  	if (WARN_ON(subreq->len == 0))
>  		source = NETFS_INVALID_READ;
>  
> +	iov_iter_xarray(&subreq->iter, READ, &rreq->mapping->i_pages,
> +			subreq->start, subreq->len);
> +
>  out:
>  	subreq->source = source;
>  	trace_netfs_sreq(subreq, netfs_sreq_trace_prepare);
> diff --git a/include/linux/netfs.h b/include/linux/netfs.h
> index fe9887768292..5e4fafcc9480 100644
> --- a/include/linux/netfs.h
> +++ b/include/linux/netfs.h
> @@ -17,6 +17,7 @@
>  #include <linux/workqueue.h>
>  #include <linux/fs.h>
>  #include <linux/pagemap.h>
> +#include <linux/uio.h>
>  
>  /*
>   * Overload PG_private_2 to give us PG_fscache - this is used to indicate that
> @@ -112,6 +113,7 @@ struct netfs_cache_resources {
>  struct netfs_read_subrequest {
>  	struct netfs_read_request *rreq;	/* Supervising read request */
>  	struct list_head	rreq_link;	/* Link in rreq->subrequests */
> +	struct iov_iter		iter;		/* Iterator for this subrequest */
>  	loff_t			start;		/* Where to start the I/O */
>  	size_t			len;		/* Size of the I/O */
>  	size_t			transferred;	/* Amount of data transferred */
> 
> 

-- 
Jeff Layton <jlayton@redhat.com>


  reply	other threads:[~2021-07-21 17:17 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-21 13:44 David Howells
2021-07-21 13:44 ` [RFC PATCH 01/12] afs: Sort out symlink reading David Howells
2021-07-21 16:20   ` Jeff Layton
2021-07-26  9:44   ` David Howells
2021-07-21 13:44 ` [RFC PATCH 02/12] netfs: Add an iov_iter to the read subreq for the network fs/cache to use David Howells
2021-07-21 17:16   ` Jeff Layton [this message]
2021-07-21 17:20   ` David Howells
2021-07-21 13:45 ` [RFC PATCH 03/12] netfs: Remove netfs_read_subrequest::transferred David Howells
2021-07-21 17:43   ` Jeff Layton
2021-07-21 18:54   ` David Howells
2021-07-21 19:00     ` Jeff Layton
2021-07-21 13:45 ` [RFC PATCH 04/12] netfs: Use a buffer in netfs_read_request and add pages to it David Howells
2021-07-21 13:45 ` [RFC PATCH 05/12] netfs: Add a netfs inode context David Howells
2021-07-21 13:46 ` [RFC PATCH 06/12] netfs: Keep lists of pending, active, dirty and flushed regions David Howells
2021-07-21 13:46 ` [RFC PATCH 07/12] netfs: Initiate write request from a dirty region David Howells
2021-07-21 13:46 ` [RFC PATCH 08/12] netfs: Keep dirty mark for pages with more than one " David Howells
2021-07-21 13:46 ` [RFC PATCH 09/12] netfs: Send write request to multiple destinations David Howells
2021-07-21 13:46 ` [RFC PATCH 10/12] netfs: Do encryption in write preparatory phase David Howells
2021-07-21 13:47 ` [RFC PATCH 11/12] netfs: Put a list of regions in /proc/fs/netfs/regions David Howells
2021-07-21 13:47 ` [RFC PATCH 12/12] netfs: Export some read-request ref functions David Howells
2021-07-21 14:00 ` [RFC PATCH 00/12] netfs: Experimental write helpers, fscrypt and compression David Howells
2021-07-21 18:42 ` [RFC PATCH 13/12] netfs: Do copy-to-cache-on-read through VM writeback David Howells

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