linux/drivers/mtd/inftlmount.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * inftlmount.c -- INFTL mount code with extensive checks.
 *
 * Author: Greg Ungerer ([email protected])
 * Copyright © 2002-2003, Greg Ungerer ([email protected])
 *
 * Based heavily on the nftlmount.c code which is:
 * Author: Fabrice Bellard ([email protected])
 * Copyright © 2000 Netgem S.A.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <asm/errno.h>
#include <asm/io.h>
#include <linux/uaccess.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nftl.h>
#include <linux/mtd/inftl.h>

/*
 * find_boot_record: Find the INFTL Media Header and its Spare copy which
 *	contains the various device information of the INFTL partition and
 *	Bad Unit Table. Update the PUtable[] table according to the Bad
 *	Unit Table. PUtable[] is used for management of Erase Unit in
 *	other routines in inftlcore.c and inftlmount.c.
 */
static int find_boot_record(struct INFTLrecord *inftl)
{ … }

static int memcmpb(void *a, int c, int n)
{ … }

/*
 * check_free_sector: check if a free sector is actually FREE,
 *	i.e. All 0xff in data and oob area.
 */
static int check_free_sectors(struct INFTLrecord *inftl, unsigned int address,
	int len, int check_oob)
{ … }

/*
 * INFTL_format: format a Erase Unit by erasing ALL Erase Zones in the Erase
 *		 Unit and Update INFTL metadata. Each erase operation is
 *		 checked with check_free_sectors.
 *
 * Return: 0 when succeed, -1 on error.
 *
 * ToDo: 1. Is it necessary to check_free_sector after erasing ??
 */
int INFTL_formatblock(struct INFTLrecord *inftl, int block)
{ … }

/*
 * format_chain: Format an invalid Virtual Unit chain. It frees all the Erase
 *	Units in a Virtual Unit Chain, i.e. all the units are disconnected.
 *
 *	Since the chain is invalid then we will have to erase it from its
 *	head (normally for INFTL we go from the oldest). But if it has a
 *	loop then there is no oldest...
 */
static void format_chain(struct INFTLrecord *inftl, unsigned int first_block)
{ … }

void INFTL_dumptables(struct INFTLrecord *s)
{ … }

void INFTL_dumpVUchains(struct INFTLrecord *s)
{ … }

int INFTL_mount(struct INFTLrecord *s)
{ … }