Remove remnants of sendfile()

There are now zero users of .sendfile() in the kernel, so kill
it from the file_operations structure and in do_sendfile().
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

fs/read_write.c

@@ -724,8 +724,7 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
 	in_inode = in_file->f_path.dentry->d_inode;
 	if (!in_inode)
 		goto fput_in;
-	if (!in_file->f_op || (!in_file->f_op->sendfile &&
-	    !in_file->f_op->splice_read))
+	if (!in_file->f_op || !in_file->f_op->splice_read)
 		goto fput_in;
 	retval = -ESPIPE;
 	if (!ppos)
@@ -778,21 +777,18 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
 		count = max - pos;
 	}
 
-	if (in_file->f_op->splice_read) {
-		fl = 0;
+	fl = 0;
 #if 0
-		/*
-		 * We need to debate whether we can enable this or not. The
-		 * man page documents EAGAIN return for the output at least,
-		 * and the application is arguably buggy if it doesn't expect
-		 * EAGAIN on a non-blocking file descriptor.
-		 */
-		if (in_file->f_flags & O_NONBLOCK)
-			fl = SPLICE_F_NONBLOCK;
+	/*
+	 * We need to debate whether we can enable this or not. The
+	 * man page documents EAGAIN return for the output at least,
+	 * and the application is arguably buggy if it doesn't expect
+	 * EAGAIN on a non-blocking file descriptor.
+	 */
+	if (in_file->f_flags & O_NONBLOCK)
+		fl = SPLICE_F_NONBLOCK;
 #endif
-		retval = do_splice_direct(in_file, ppos, out_file, count, fl);
-	} else
-		retval = in_file->f_op->sendfile(in_file, ppos, count, file_send_actor, out_file);
+	retval = do_splice_direct(in_file, ppos, out_file, count, fl);
 
 	if (retval > 0) {
 		add_rchar(current, retval);

include/linux/fs.h

@@ -1054,7 +1054,7 @@ struct block_device_operations {
 };
 
 /*
- * "descriptor" for what we're up to with a read for sendfile().
+ * "descriptor" for what we're up to with a read.
  * This allows us to use the same read code yet
  * have multiple different users of the data that
  * we read from a file.
@@ -1105,7 +1105,6 @@ struct file_operations {
 	int (*aio_fsync) (struct kiocb *, int datasync);
 	int (*fasync) (int, struct file *, int);
 	int (*lock) (struct file *, int, struct file_lock *);
-	ssize_t (*sendfile) (struct file *, loff_t *, size_t, read_actor_t, void *);
 	ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
 	unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
 	int (*check_flags)(int);