linux-kernel - [PATCH 28/32] NFS: Call readpage_async_filler() from nfs_readpage

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Date:   Mon, 25 Jan 2021 21:36:25 +0000
From:   David Howells <dhowells@...hat.com>
To:     Trond Myklebust <trondmy@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        Steve French <sfrench@...ba.org>,
        Dominique Martinet <asmadeus@...ewreck.org>
Cc:     Dave Wysochanski <dwysocha@...hat.com>, dhowells@...hat.com,
        Jeff Layton <jlayton@...hat.com>,
        David Wysochanski <dwysocha@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-cachefs@...hat.com, linux-afs@...ts.infradead.org,
        linux-nfs@...r.kernel.org, linux-cifs@...r.kernel.org,
        ceph-devel@...r.kernel.org, v9fs-developer@...ts.sourceforge.net,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 28/32] NFS: Call readpage_async_filler() from
 nfs_readpage_async()

From: Dave Wysochanski <dwysocha@...hat.com>

Refactor slightly so nfs_readpage_async() calls into
readpage_async_filler().

Signed-off-by: Dave Wysochanski <dwysocha@...hat.com>
---

 fs/nfs/read.c |   28 +++++++++++-----------------
 1 file changed, 11 insertions(+), 17 deletions(-)

diff --git a/fs/nfs/read.c b/fs/nfs/read.c
index 5fda30742a32..1401f1c734c0 100644
--- a/fs/nfs/read.c
+++ b/fs/nfs/read.c
@@ -119,31 +119,22 @@ struct nfs_readdesc {
 	struct nfs_open_context *ctx;
 };
 
+static int readpage_async_filler(void *data, struct page *page);
+
 int nfs_readpage_async(void *data, struct inode *inode,
 		       struct page *page)
 {
 	struct nfs_readdesc *desc = (struct nfs_readdesc *)data;
-	struct nfs_page	*new;
-	unsigned int len;
 	struct nfs_pgio_mirror *pgm;
-
-	len = nfs_page_length(page);
-	if (len == 0)
-		return nfs_return_empty_page(page);
-	new = nfs_create_request(desc->ctx, page, 0, len);
-	if (IS_ERR(new)) {
-		unlock_page(page);
-		return PTR_ERR(new);
-	}
-	if (len < PAGE_SIZE)
-		zero_user_segment(page, len, PAGE_SIZE);
+	int error;
 
 	nfs_pageio_init_read(&desc->pgio, inode, false,
 			     &nfs_async_read_completion_ops);
-	if (!nfs_pageio_add_request(&desc->pgio, new)) {
-		nfs_list_remove_request(new);
-		nfs_readpage_release(new, desc->pgio.pg_error);
-	}
+
+	error = readpage_async_filler(desc, page);
+	if (error)
+		goto out;
+
 	nfs_pageio_complete(&desc->pgio);
 
 	/* It doesn't make sense to do mirrored reads! */
@@ -153,6 +144,9 @@ int nfs_readpage_async(void *data, struct inode *inode,
 	NFS_I(inode)->read_io += pgm->pg_bytes_written;
 
 	return desc->pgio.pg_error < 0 ? desc->pgio.pg_error : 0;
+
+out:
+	return error;
 }
 
 static void nfs_page_group_set_uptodate(struct nfs_page *req)