Received-SPF: pass (google.com: domain of linux-nfs-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Dave Wysochanski <dwysocha@redhat.com>
To:     Trond Myklebust <trondmy@hammerspace.com>,
        Anna Schumaker <anna.schumaker@netapp.com>
Cc:     linux-nfs@vger.kernel.org, linux-cachefs@redhat.com
Subject: [RFC PATCH v1 03/13] NFS: Refactor nfs_readpage() and nfs_readpage_async() to use nfs_readdesc
Date:   Wed, 15 Jul 2020 11:10:39 -0400
Message-Id: <1594825849-24991-4-git-send-email-dwysocha@redhat.com>
In-Reply-To: <1594825849-24991-1-git-send-email-dwysocha@redhat.com>
References: <1594825849-24991-1-git-send-email-dwysocha@redhat.com>
Sender: linux-nfs-owner@vger.kernel.org
Precedence: bulk

Both nfs_readpage() and nfs_readpages() use similar code.
This patch should be no functional change, and refactors
nfs_readpage_async() to use nfs_readdesc to enable future
merging of nfs_readpage_async() and nfs_readpage_async_filler().

Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
---
 fs/nfs/read.c          | 50 ++++++++++++++++++++++++++------------------------
 include/linux/nfs_fs.h |  3 +--
 2 files changed, 27 insertions(+), 26 deletions(-)

diff --git a/fs/nfs/read.c b/fs/nfs/read.c
index 1153c4e0a155..d635f635d8e3 100644
--- a/fs/nfs/read.c
+++ b/fs/nfs/read.c
@@ -114,18 +114,23 @@ static void nfs_readpage_release(struct nfs_page *req, int error)
 	nfs_release_request(req);
 }
 
-int nfs_readpage_async(struct nfs_open_context *ctx, struct inode *inode,
+struct nfs_readdesc {
+	struct nfs_pageio_descriptor *pgio;
+	struct nfs_open_context *ctx;
+};
+
+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_pageio_descriptor pgio;
 	struct nfs_pgio_mirror *pgm;
 
 	len = nfs_page_length(page);
 	if (len == 0)
 		return nfs_return_empty_page(page);
-	new = nfs_create_request(ctx, page, 0, len);
+	new = nfs_create_request(desc->ctx, page, 0, len);
 	if (IS_ERR(new)) {
 		unlock_page(page);
 		return PTR_ERR(new);
@@ -133,21 +138,21 @@ int nfs_readpage_async(struct nfs_open_context *ctx, struct inode *inode,
 	if (len < PAGE_SIZE)
 		zero_user_segment(page, len, PAGE_SIZE);
 
-	nfs_pageio_init_read(&pgio, inode, false,
+	nfs_pageio_init_read(desc->pgio, inode, false,
 			     &nfs_async_read_completion_ops);
-	if (!nfs_pageio_add_request(&pgio, new)) {
+	if (!nfs_pageio_add_request(desc->pgio, new)) {
 		nfs_list_remove_request(new);
-		nfs_readpage_release(new, pgio.pg_error);
+		nfs_readpage_release(new, desc->pgio->pg_error);
 	}
-	nfs_pageio_complete(&pgio);
+	nfs_pageio_complete(desc->pgio);
 
 	/* It doesn't make sense to do mirrored reads! */
-	WARN_ON_ONCE(pgio.pg_mirror_count != 1);
+	WARN_ON_ONCE(desc->pgio->pg_mirror_count != 1);
 
-	pgm = &pgio.pg_mirrors[0];
+	pgm = &desc->pgio->pg_mirrors[0];
 	NFS_I(inode)->read_io += pgm->pg_bytes_written;
 
-	return pgio.pg_error < 0 ? pgio.pg_error : 0;
+	return desc->pgio->pg_error < 0 ? desc->pgio->pg_error : 0;
 }
 
 static void nfs_page_group_set_uptodate(struct nfs_page *req)
@@ -312,7 +317,8 @@ static void nfs_readpage_result(struct rpc_task *task,
  */
 int nfs_readpage(struct file *filp, struct page *page)
 {
-	struct nfs_open_context *ctx;
+	struct nfs_pageio_descriptor pgio;
+	struct nfs_readdesc desc;
 	struct inode *inode = page_file_mapping(page)->host;
 	int ret;
 
@@ -339,39 +345,35 @@ int nfs_readpage(struct file *filp, struct page *page)
 
 	if (filp == NULL) {
 		ret = -EBADF;
-		ctx = nfs_find_open_context(inode, NULL, FMODE_READ);
-		if (ctx == NULL)
+		desc.ctx = nfs_find_open_context(inode, NULL, FMODE_READ);
+		if (desc.ctx == NULL)
 			goto out_unlock;
 	} else
-		ctx = get_nfs_open_context(nfs_file_open_context(filp));
+		desc.ctx = get_nfs_open_context(nfs_file_open_context(filp));
 
 	if (!IS_SYNC(inode)) {
-		ret = nfs_readpage_from_fscache(ctx, inode, page);
+		ret = nfs_readpage_from_fscache(desc.ctx, inode, page);
 		if (ret == 0)
 			goto out;
 	}
 
-	xchg(&ctx->error, 0);
-	ret = nfs_readpage_async(ctx, inode, page);
+	desc.pgio = &pgio;
+	xchg(&desc.ctx->error, 0);
+	ret = nfs_readpage_async(&desc, inode, page);
 	if (!ret) {
 		ret = wait_on_page_locked_killable(page);
 		if (!PageUptodate(page) && !ret)
-			ret = xchg(&ctx->error, 0);
+			ret = xchg(&desc.ctx->error, 0);
 	}
 	nfs_add_stats(inode, NFSIOS_READPAGES, 1);
 out:
-	put_nfs_open_context(ctx);
+	put_nfs_open_context(desc.ctx);
 	return ret;
 out_unlock:
 	unlock_page(page);
 	return ret;
 }
 
-struct nfs_readdesc {
-	struct nfs_pageio_descriptor *pgio;
-	struct nfs_open_context *ctx;
-};
-
 static int
 readpage_async_filler(void *data, struct page *page)
 {
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index 6ee9119acc5d..7e5b9df9cfe6 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -553,8 +553,7 @@ extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh,
 extern int  nfs_readpage(struct file *, struct page *);
 extern int  nfs_readpages(struct file *, struct address_space *,
 		struct list_head *, unsigned);
-extern int  nfs_readpage_async(struct nfs_open_context *, struct inode *,
-			       struct page *);
+extern int  nfs_readpage_async(void *, struct inode *, struct page *);
 
 /*
  * inline functions
-- 
1.8.3.1