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402d326519
Present backing device capabilities for MTD character device files to allow NOMMU mmap to do direct mapping where possible. Signed-off-by: David Howells <dhowells@redhat.com> Tested-by: Bernd Schmidt <bernd.schmidt@analog.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
44 lines
1.4 KiB
C
44 lines
1.4 KiB
C
/* MTD backing device capabilities
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*
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* Copyright © 2006 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/backing-dev.h>
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#include <linux/mtd/mtd.h>
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#include "internal.h"
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/*
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* backing device capabilities for non-mappable devices (such as NAND flash)
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* - permits private mappings, copies are taken of the data
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*/
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struct backing_dev_info mtd_bdi_unmappable = {
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.capabilities = BDI_CAP_MAP_COPY,
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};
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/*
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* backing device capabilities for R/O mappable devices (such as ROM)
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* - permits private mappings, copies are taken of the data
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* - permits non-writable shared mappings
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*/
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struct backing_dev_info mtd_bdi_ro_mappable = {
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.capabilities = (BDI_CAP_MAP_COPY | BDI_CAP_MAP_DIRECT |
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BDI_CAP_EXEC_MAP | BDI_CAP_READ_MAP),
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};
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/*
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* backing device capabilities for writable mappable devices (such as RAM)
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* - permits private mappings, copies are taken of the data
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* - permits non-writable shared mappings
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*/
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struct backing_dev_info mtd_bdi_rw_mappable = {
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.capabilities = (BDI_CAP_MAP_COPY | BDI_CAP_MAP_DIRECT |
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BDI_CAP_EXEC_MAP | BDI_CAP_READ_MAP |
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BDI_CAP_WRITE_MAP),
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};
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