NFS: Remove unused argument from nfs_create_request()

All the callers of nfs_create_request() are now creating page group
heads, so we can remove the redundant 'last' page argument.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

fs/nfs/direct.c

@@ -492,7 +492,7 @@ static ssize_t nfs_direct_read_schedule_iovec(struct nfs_direct_req *dreq,
 			struct nfs_page *req;
 			unsigned int req_len = min_t(size_t, bytes, PAGE_SIZE - pgbase);
 			/* XXX do we need to do the eof zeroing found in async_filler? */
-			req = nfs_create_request(dreq->ctx, pagevec[i], NULL,
+			req = nfs_create_request(dreq->ctx, pagevec[i],
 						 pgbase, req_len);
 			if (IS_ERR(req)) {
 				result = PTR_ERR(req);
@@ -899,7 +899,7 @@ static ssize_t nfs_direct_write_schedule_iovec(struct nfs_direct_req *dreq,
 			struct nfs_page *req;
 			unsigned int req_len = min_t(size_t, bytes, PAGE_SIZE - pgbase);
 
-			req = nfs_create_request(dreq->ctx, pagevec[i], NULL,
+			req = nfs_create_request(dreq->ctx, pagevec[i],
 						 pgbase, req_len);
 			if (IS_ERR(req)) {
 				result = PTR_ERR(req);

fs/nfs/pagelist.c

@@ -297,8 +297,8 @@ nfs_page_group_destroy(struct kref *kref)
 
 static struct nfs_page *
 __nfs_create_request(struct nfs_lock_context *l_ctx, struct page *page,
-		   struct nfs_page *last, unsigned int pgbase,
-		   unsigned int offset, unsigned int count)
+		   unsigned int pgbase, unsigned int offset,
+		   unsigned int count)
 {
 	struct nfs_page		*req;
 	struct nfs_open_context *ctx = l_ctx->open_context;
@@ -327,15 +327,13 @@ __nfs_create_request(struct nfs_lock_context *l_ctx, struct page *page,
 	req->wb_bytes   = count;
 	req->wb_context = get_nfs_open_context(ctx);
 	kref_init(&req->wb_kref);
-	nfs_page_group_init(req, last);
 	return req;
 }
 
 /**
  * nfs_create_request - Create an NFS read/write request.
  * @ctx: open context to use
  * @page: page to write
- * @last: last nfs request created for this page group or NULL if head
  * @offset: starting offset within the page for the write
  * @count: number of bytes to read/write
  *
@@ -345,15 +343,16 @@ __nfs_create_request(struct nfs_lock_context *l_ctx, struct page *page,
  */
 struct nfs_page *
 nfs_create_request(struct nfs_open_context *ctx, struct page *page,
-		   struct nfs_page *last, unsigned int offset,
-		   unsigned int count)
+		   unsigned int offset, unsigned int count)
 {
 	struct nfs_lock_context *l_ctx = nfs_get_lock_context(ctx);
 	struct nfs_page *ret;
 
 	if (IS_ERR(l_ctx))
 		return ERR_CAST(l_ctx);
-	ret = __nfs_create_request(l_ctx, page, last, offset, offset, count);
+	ret = __nfs_create_request(l_ctx, page, offset, offset, count);
+	if (!IS_ERR(ret))
+		nfs_page_group_init(ret, NULL);
 	nfs_put_lock_context(l_ctx);
 	return ret;
 }
@@ -365,11 +364,12 @@ nfs_create_subreq(struct nfs_page *req, struct nfs_page *last,
 {
 	struct nfs_page *ret;
 
-	ret = __nfs_create_request(req->wb_lock_context, req->wb_page, last,
+	ret = __nfs_create_request(req->wb_lock_context, req->wb_page,
 			pgbase, offset, count);
 	if (!IS_ERR(ret)) {
 		nfs_lock_request(ret);
 		ret->wb_index = req->wb_index;
+		nfs_page_group_init(ret, last);
 	}
 	return ret;
 }

fs/nfs/read.c

@@ -118,7 +118,7 @@ int nfs_readpage_async(struct nfs_open_context *ctx, struct inode *inode,
 	len = nfs_page_length(page);
 	if (len == 0)
 		return nfs_return_empty_page(page);
-	new = nfs_create_request(ctx, page, NULL, 0, len);
+	new = nfs_create_request(ctx, page, 0, len);
 	if (IS_ERR(new)) {
 		unlock_page(page);
 		return PTR_ERR(new);
@@ -363,7 +363,7 @@ readpage_async_filler(void *data, struct page *page)
 	if (len == 0)
 		return nfs_return_empty_page(page);
 
-	new = nfs_create_request(desc->ctx, page, NULL, 0, len);
+	new = nfs_create_request(desc->ctx, page, 0, len);
 	if (IS_ERR(new))
 		goto out_error;
 

fs/nfs/write.c

@@ -1171,7 +1171,7 @@ static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx,
 	req = nfs_try_to_update_request(inode, page, offset, bytes);
 	if (req != NULL)
 		goto out;
-	req = nfs_create_request(ctx, page, NULL, offset, bytes);
+	req = nfs_create_request(ctx, page, offset, bytes);
 	if (IS_ERR(req))
 		goto out;
 	nfs_inode_add_request(inode, req);

include/linux/nfs_page.h

@@ -114,7 +114,6 @@ struct nfs_pageio_descriptor {
 
 extern	struct nfs_page *nfs_create_request(struct nfs_open_context *ctx,
 					    struct page *page,
-					    struct nfs_page *last,
 					    unsigned int offset,
 					    unsigned int count);
 extern	void nfs_release_request(struct nfs_page *);