NFS: Clean up new multi-segment direct I/O changes

Simplify calling sequence of nfs_direct_{read,write}_schedule(), and
rename them to reflect their new role.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/direct.c

@@ -263,10 +263,14 @@ static const struct rpc_call_ops nfs_read_direct_ops = {
  * handled automatically by nfs_direct_read_result().  Otherwise, if
  * no requests have been sent, just return an error.
  */
-static ssize_t nfs_direct_read_schedule(struct nfs_direct_req *dreq, unsigned long user_addr, size_t count, loff_t pos)
+static ssize_t nfs_direct_read_schedule_segment(struct nfs_direct_req *dreq,
+						const struct iovec *iov,
+						loff_t pos)
 {
 	struct nfs_open_context *ctx = dreq->ctx;
 	struct inode *inode = ctx->path.dentry->d_inode;
+	unsigned long user_addr = (unsigned long)iov->iov_base;
+	size_t count = iov->iov_len;
 	size_t rsize = NFS_SERVER(inode)->rsize;
 	unsigned int pgbase;
 	int result;
@@ -363,9 +367,7 @@ static ssize_t nfs_direct_read_schedule_iovec(struct nfs_direct_req *dreq,
 
 	for (seg = 0; seg < nr_segs; seg++) {
 		const struct iovec *vec = &iov[seg];
-		result = nfs_direct_read_schedule(dreq,
-					(unsigned long)vec->iov_base,
-						  vec->iov_len, pos);
+		result = nfs_direct_read_schedule_segment(dreq, vec, pos);
 		if (result < 0)
 			break;
 		requested_bytes += result;
@@ -631,10 +633,14 @@ static const struct rpc_call_ops nfs_write_direct_ops = {
  * handled automatically by nfs_direct_write_result().  Otherwise, if
  * no requests have been sent, just return an error.
  */
-static ssize_t nfs_direct_write_schedule(struct nfs_direct_req *dreq, unsigned long user_addr, size_t count, loff_t pos, int sync)
+static ssize_t nfs_direct_write_schedule_segment(struct nfs_direct_req *dreq,
+						 const struct iovec *iov,
+						 loff_t pos, int sync)
 {
 	struct nfs_open_context *ctx = dreq->ctx;
 	struct inode *inode = ctx->path.dentry->d_inode;
+	unsigned long user_addr = (unsigned long)iov->iov_base;
+	size_t count = iov->iov_len;
 	size_t wsize = NFS_SERVER(inode)->wsize;
 	unsigned int pgbase;
 	int result;
@@ -735,9 +741,7 @@ static ssize_t nfs_direct_write_schedule_iovec(struct nfs_direct_req *dreq,
 
 	for (seg = 0; seg < nr_segs; seg++) {
 		const struct iovec *vec = &iov[seg];
-		result = nfs_direct_write_schedule(dreq,
-					(unsigned long)vec->iov_base,
-						   vec->iov_len,
+		result = nfs_direct_write_schedule_segment(dreq, vec,
 							   pos, sync);
 		if (result < 0)
 			break;