drivers/mtd/mtdbdi.c

   1 /* MTD backing device capabilities
   2  *
   3  * Copyright © 2006 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <linux/backing-dev.h>
  13 #include <linux/mtd/mtd.h>
  14 #include "internal.h"
  15
  16 /*
  17  * backing device capabilities for non-mappable devices (such as NAND flash)
  18  * - permits private mappings, copies are taken of the data
  19  */
  20 struct backing_dev_info mtd_bdi_unmappable = {
  21         .capabilities   = BDI_CAP_MAP_COPY,
  22 };
  23
  24 /*
  25  * backing device capabilities for R/O mappable devices (such as ROM)
  26  * - permits private mappings, copies are taken of the data
  27  * - permits non-writable shared mappings
  28  */
  29 struct backing_dev_info mtd_bdi_ro_mappable = {
  30         .capabilities   = (BDI_CAP_MAP_COPY | BDI_CAP_MAP_DIRECT |
  31                            BDI_CAP_EXEC_MAP | BDI_CAP_READ_MAP),
  32 };
  33
  34 /*
  35  * backing device capabilities for writable mappable devices (such as RAM)
  36  * - permits private mappings, copies are taken of the data
  37  * - permits non-writable shared mappings
  38  */
  39 struct backing_dev_info mtd_bdi_rw_mappable = {
  40         .capabilities   = (BDI_CAP_MAP_COPY | BDI_CAP_MAP_DIRECT |
  41                            BDI_CAP_EXEC_MAP | BDI_CAP_READ_MAP |
  42                            BDI_CAP_WRITE_MAP),
  43 };