sysfs: remove bin_attribute::read_new/write_new()

These transitional fields are now unused and unnecessary.
Remove them and their logic in the sysfs core.

Signed-off-by: Thomas Weißschuh <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

fs/sysfs/file.c

···
 			count = size - pos;
 	}
 
-	if (!battr->read && !battr->read_new)
+	if (!battr->read)
 		return -EIO;
-
-	if (battr->read_new)
-		return battr->read_new(of->file, kobj, battr, buf, pos, count);
 
 	return battr->read(of->file, kobj, battr, buf, pos, count);
 }
···
 	if (!count)
 		return 0;
 
-	if (!battr->write && !battr->write_new)
+	if (!battr->write)
 		return -EIO;
-
-	if (battr->write_new)
-		return battr->write_new(of->file, kobj, battr, buf, pos, count);
 
 	return battr->write(of->file, kobj, battr, buf, pos, count);
 }
···
 	const struct kernfs_ops *ops;
 	struct kernfs_node *kn;
 
-	if (battr->read && battr->read_new)
-		return -EINVAL;
-
-	if (battr->write && battr->write_new)
-		return -EINVAL;
-
 	if (battr->mmap)
 		ops = &sysfs_bin_kfops_mmap;
-	else if ((battr->read || battr->read_new) && (battr->write || battr->write_new))
+	else if (battr->read && battr->write)
 		ops = &sysfs_bin_kfops_rw;
-	else if (battr->read || battr->read_new)
+	else if (battr->read)
 		ops = &sysfs_bin_kfops_ro;
-	else if (battr->write || battr->write_new)
+	else if (battr->write)
 		ops = &sysfs_bin_kfops_wo;
 	else
 		ops = &sysfs_file_kfops_empty;

include/linux/sysfs.h

···
 	struct address_space *(*f_mapping)(void);
 	ssize_t (*read)(struct file *, struct kobject *, const struct bin_attribute *,
 			char *, loff_t, size_t);
-	ssize_t (*read_new)(struct file *, struct kobject *, const struct bin_attribute *,
-			    char *, loff_t, size_t);
 	ssize_t (*write)(struct file *, struct kobject *, const struct bin_attribute *,
 			 char *, loff_t, size_t);
-	ssize_t (*write_new)(struct file *, struct kobject *,
-			     const struct bin_attribute *, char *, loff_t, size_t);
 	loff_t (*llseek)(struct file *, struct kobject *, const struct bin_attribute *,
 			 loff_t, int);
 	int (*mmap)(struct file *, struct kobject *, const struct bin_attribute *attr,