mtd-utils-1.3.1/ubi-utils/src/libmtd_legacy.c - nest-learning-thermostat/5.1.6/mtd-utils - Git at Google

 /*
  * Copyright (C) 2009 Nokia Corporation
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
  * the GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  *
  * Author: Artem Bityutskiy
  *
  * This file  is part of the MTD library. Implements pre-2.6.30 kernels support,
  * where MTD did not have sysfs interface. The main limitation of the old
  * kernels was that the sub-page size was not exported to user-space, so it was
  * not possible to get sub-page size.
  */

 #include <limits.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <stdlib.h>
 #include <errno.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/ioctl.h>
 #include <mtd/mtd-user.h>

 #include <libmtd.h>
 #include "libmtd_int.h"
 #include "common.h"

 #define MTD_PROC_FILE "/proc/mtd"
 #define MTD_DEV_PATT  "/dev/mtd%d"
 #define MTD_DEV_MAJOR 90

 #define PROC_MTD_FIRST     "dev:    size   erasesize  name\n"
 #define PROC_MTD_FIRST_LEN (sizeof(PROC_MTD_FIRST) - 1)
 #define PROC_MTD_MAX_LEN   4096
 #define PROC_MTD_PATT      "mtd%d: %llx %x"

 /**
  * struct proc_parse_info - /proc/mtd parsing information.
  * @dev_num: MTD device number
  * @size: device size
  * @eb_size: eraseblock size
  * @name: device name
  * @buf: contents of /proc/mtd
  * @data_size: how much data was read into @buf
  * @pos: next string in @buf to parse
  */
 struct proc_parse_info
 {
 	int dev_num;
 	long long size;
 	char name[MTD_NAME_MAX + 1];
 	int eb_size;
 	char *buf;
 	int data_size;
 	char *next;
 };

 static int proc_parse_start(struct proc_parse_info *pi)
 {
 	int fd, ret;

 	fd = open(MTD_PROC_FILE, O_RDONLY);
 	if (fd == -1)
 		return -1;

 	pi->buf = malloc(PROC_MTD_MAX_LEN);
 	if (!pi->buf) {
 		sys_errmsg("cannot allocate %d bytes of memory",
 			   PROC_MTD_MAX_LEN);
 		goto out_close;
 	}

 	ret = read(fd, pi->buf, PROC_MTD_MAX_LEN);
 	if (ret == -1) {
 		sys_errmsg("cannot read \"%s\"", MTD_PROC_FILE);
 		goto out_free;
 	}

 	if (ret < PROC_MTD_FIRST_LEN ||
 	    memcmp(pi->buf, PROC_MTD_FIRST, PROC_MTD_FIRST_LEN)) {
 		errmsg("\"%s\" does not start with \"%s\"", MTD_PROC_FILE,
 		       PROC_MTD_FIRST);
 		goto out_free;
 	}

 	pi->data_size = ret;
 	pi->next = pi->buf + PROC_MTD_FIRST_LEN;

 	close(fd);
 	return 0;

 out_free:
 	free(pi->buf);
 out_close:
 	close(fd);
 	return -1;
 }

 static int proc_parse_next(struct proc_parse_info *pi)
 {
 	int ret, len, pos = pi->next - pi->buf;
 	char *p, *p1;

 	if (pos >= pi->data_size) {
 		free(pi->buf);
 		return 0;
 	}

 	ret = sscanf(pi->next, PROC_MTD_PATT, &pi->dev_num, &pi->size,
 		     &pi->eb_size);
 	if (ret != 3)
 		return errmsg("\"%s\" pattern not found", PROC_MTD_PATT);

 	p = memchr(pi->next, '\"', pi->data_size - pos);
 	if (!p)
 		return errmsg("opening \" not fount");
 	p += 1;
 	pos = p - pi->buf;
 	if (pos >= pi->data_size)
 		return errmsg("opening \" not fount");

 	p1 = memchr(p, '\"', pi->data_size - pos);
 	if (!p1)
 		return errmsg("closing \" not fount");
 	pos = p1 - pi->buf;
 	if (pos >= pi->data_size)
 		return errmsg("closing \" not fount");

 	len = p1 - p;
 	if (len > MTD_NAME_MAX)
 		return errmsg("too long mtd%d device name", pi->dev_num);

 	memcpy(pi->name, p, len);
 	pi->name[len] = '\0';

 	if (p1[1] != '\n')
 		return errmsg("opening \"\n\" not fount");
 	pi->next = p1 + 2;
 	return 1;
 }

 /**
  * legacy_libmtd_open - legacy version of 'libmtd_open()'.
  *
  * This function is just checks that MTD is present in the system. Returns
  * zero in case of success and %-1 in case of failure. In case of failure,
  * errno contains zero if MTD is not present in the system, or contains the
  * error code if a real error happened. This is similar to the 'libmtd_open()'
  * return conventions.
  */
 int legacy_libmtd_open(void)
 {
 	int fd;

 	fd = open(MTD_PROC_FILE, O_RDONLY);
 	if (fd == -1) {
 		if (errno == ENOENT)
 			errno = 0;
 		return -1;
 	}

 	close(fd);
 	return 0;
 }

 /**
  * legacy_mtd_get_info - legacy version of 'mtd_get_info()'.
  * @info: the MTD device information is returned here
  *
  * This function is similar to 'mtd_get_info()' and has the same conventions.
  */
 int legacy_mtd_get_info(struct mtd_info *info)
 {
 	int ret;
 	struct proc_parse_info pi;

 	ret = proc_parse_start(&pi);
 	if (ret)
 		return -1;

 	info->lowest_dev_num = INT_MAX;
 	while (proc_parse_next(&pi)) {
 		info->dev_count += 1;
 		if (pi.dev_num > info->highest_dev_num)
 			info->highest_dev_num = pi.dev_num;
 		if (pi.dev_num < info->lowest_dev_num)
 			info->lowest_dev_num = pi.dev_num;
 	}

 	return 0;
 }

 /**
  * legacy_get_dev_info - legacy version of 'mtd_get_dev_info()'.
  * @node: name of the MTD device node
  * @mtd: the MTD device information is returned here
  *
  * This function is similar to 'mtd_get_dev_info()' and has the same
  * conventions.
  */
 int legacy_get_dev_info(const char *node, struct mtd_dev_info *mtd)
 {
 	struct stat st;
 	struct mtd_info_user ui;
 	int fd, ret;
 	loff_t offs = 0;
 	struct proc_parse_info pi;

 	if (stat(node, &st)) {
 		sys_errmsg("cannot open \"%s\"", node);
 		if (errno == ENOENT)
 			normsg("MTD subsystem is old and does not support "
 			       "sysfs, so MTD character device nodes have "
 			       "to exist");
 	}

 	if (!S_ISCHR(st.st_mode)) {
 		errno = EINVAL;
 		return errmsg("\"%s\" is not a character device", node);
 	}

 	memset(mtd, '\0', sizeof(struct mtd_dev_info));
 	mtd->major = major(st.st_rdev);
 	mtd->minor = minor(st.st_rdev);

 	if (mtd->major != MTD_DEV_MAJOR) {
 		errno = EINVAL;
 		return errmsg("\"%s\" has major number %d, MTD devices have "
 			      "major %d", node, mtd->major, MTD_DEV_MAJOR);
 	}

 	mtd->dev_num = mtd->minor / 2;

 	fd = open(node, O_RDWR);
 	if (fd == -1)
 		return sys_errmsg("cannot open \"%s\"", node);

 	if (ioctl(fd, MEMGETINFO, &ui)) {
 		sys_errmsg("MEMGETINFO ioctl request failed");
 		goto out_close;
 	}

 	ret = ioctl(fd, MEMGETBADBLOCK, &offs);
 	if (ret == -1) {
 		if (errno != EOPNOTSUPP) {
 			sys_errmsg("MEMGETBADBLOCK ioctl failed");
 			goto out_close;
 		}
 		errno = 0;
 		mtd->bb_allowed = 0;
 	} else
 		mtd->bb_allowed = 1;

 	mtd->type = ui.type;
 	mtd->size = ui.size;
 	mtd->eb_size = ui.erasesize;
 	mtd->min_io_size = ui.writesize;

 	if (mtd->min_io_size <= 0) {
 		errmsg("mtd%d (%s) has insane min. I/O unit size %d",
 		       mtd->dev_num, node, mtd->min_io_size);
 		goto out_close;
 	}
 	if (mtd->eb_size <= 0 || mtd->eb_size < mtd->min_io_size) {
 		errmsg("mtd%d (%s) has insane eraseblock size %d",
 		       mtd->dev_num, node, mtd->eb_size);
 		goto out_close;
 	}
 	if (mtd->size <= 0 || mtd->size < mtd->eb_size) {
 		errmsg("mtd%d (%s) has insane size %lld",
 		       mtd->dev_num, node, mtd->size);
 		goto out_close;
 	}
 	mtd->eb_cnt = mtd->size / mtd->eb_size;

 	switch(mtd->type) {
 	case MTD_ABSENT:
 		errmsg("mtd%d (%s) is removable and is not present",
 		       mtd->dev_num, node);
 		goto out_close;
 	case MTD_RAM:
 		strcpy((char *)mtd->type_str, "ram");
 		break;
 	case MTD_ROM:
 		strcpy((char *)mtd->type_str, "rom");
 		break;
 	case MTD_NORFLASH:
 		strcpy((char *)mtd->type_str, "nor");
 		break;
 	case MTD_NANDFLASH:
 		strcpy((char *)mtd->type_str, "nand");
 		break;
 	case MTD_DATAFLASH:
 		strcpy((char *)mtd->type_str, "dataflash");
 		break;
 	case MTD_UBIVOLUME:
 		strcpy((char *)mtd->type_str, "ubi");
 		break;
 	default:
 		goto out_close;
 	}

 	if (ui.flags & MTD_WRITEABLE)
 		mtd->writable = 1;
 	mtd->subpage_size = mtd->min_io_size;

 	close(fd);

 	/*
 	 * Unfortunately, the device name is not available via ioctl, and
 	 * we have to parse /proc/mtd to get it.
 	 */
 	ret = proc_parse_start(&pi);
 	if (ret)
 		return -1;

 	while (proc_parse_next(&pi)) {
 		if (pi.dev_num == mtd->dev_num) {
 			strcpy((char *)mtd->name, pi.name);
 			return 0;
 		}
 	}

 	errmsg("mtd%d not found in \"%s\"", mtd->dev_num, MTD_PROC_FILE);
 	errno = ENOENT;
 	return -1;

 out_close:
 	close(fd);
 	return -1;
 }

 /**
  * legacy_get_dev_info1 - legacy version of 'mtd_get_dev_info1()'.
  * @node: name of the MTD device node
  * @mtd: the MTD device information is returned here
  *
  * This function is similar to 'mtd_get_dev_info1()' and has the same
  * conventions.
  */
 int legacy_get_dev_info1(int dev_num, struct mtd_dev_info *mtd)
 {
 	char node[sizeof(MTD_DEV_PATT) + 20];

 	sprintf(node, MTD_DEV_PATT, dev_num);
 	return legacy_get_dev_info(node, mtd);
 }
	/*
	* Copyright (C) 2009 Nokia Corporation
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
	* the GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	*
	* Author: Artem Bityutskiy
	*
	* This file is part of the MTD library. Implements pre-2.6.30 kernels support,
	* where MTD did not have sysfs interface. The main limitation of the old
	* kernels was that the sub-page size was not exported to user-space, so it was
	* not possible to get sub-page size.
	*/

	#include <limits.h>
	#include <fcntl.h>
	#include <unistd.h>
	#include <stdlib.h>
	#include <errno.h>
	#include <sys/types.h>
	#include <sys/stat.h>
	#include <sys/ioctl.h>
	#include <mtd/mtd-user.h>

	#include <libmtd.h>
	#include "libmtd_int.h"
	#include "common.h"

	#define MTD_PROC_FILE "/proc/mtd"
	#define MTD_DEV_PATT "/dev/mtd%d"
	#define MTD_DEV_MAJOR 90

	#define PROC_MTD_FIRST "dev: size erasesize name\n"
	#define PROC_MTD_FIRST_LEN (sizeof(PROC_MTD_FIRST) - 1)
	#define PROC_MTD_MAX_LEN 4096
	#define PROC_MTD_PATT "mtd%d: %llx %x"

	/**
	* struct proc_parse_info - /proc/mtd parsing information.
	* @dev_num: MTD device number
	* @size: device size
	* @eb_size: eraseblock size
	* @name: device name
	* @buf: contents of /proc/mtd
	* @data_size: how much data was read into @buf
	* @pos: next string in @buf to parse
	*/
	struct proc_parse_info
	{
	int dev_num;
	long long size;
	char name[MTD_NAME_MAX + 1];
	int eb_size;
	char *buf;
	int data_size;
	char *next;
	};

	static int proc_parse_start(struct proc_parse_info *pi)
	{
	int fd, ret;

	fd = open(MTD_PROC_FILE, O_RDONLY);
	if (fd == -1)
	return -1;

	pi->buf = malloc(PROC_MTD_MAX_LEN);
	if (!pi->buf) {
	sys_errmsg("cannot allocate %d bytes of memory",
	PROC_MTD_MAX_LEN);
	goto out_close;
	}

	ret = read(fd, pi->buf, PROC_MTD_MAX_LEN);
	if (ret == -1) {
	sys_errmsg("cannot read \"%s\"", MTD_PROC_FILE);
	goto out_free;
	}

	if (ret < PROC_MTD_FIRST_LEN \|\|
	memcmp(pi->buf, PROC_MTD_FIRST, PROC_MTD_FIRST_LEN)) {
	errmsg("\"%s\" does not start with \"%s\"", MTD_PROC_FILE,
	PROC_MTD_FIRST);
	goto out_free;
	}

	pi->data_size = ret;
	pi->next = pi->buf + PROC_MTD_FIRST_LEN;

	close(fd);
	return 0;

	out_free:
	free(pi->buf);
	out_close:
	close(fd);
	return -1;
	}

	static int proc_parse_next(struct proc_parse_info *pi)
	{
	int ret, len, pos = pi->next - pi->buf;
	char p, p1;

	if (pos >= pi->data_size) {
	free(pi->buf);
	return 0;
	}

	ret = sscanf(pi->next, PROC_MTD_PATT, &pi->dev_num, &pi->size,
	&pi->eb_size);
	if (ret != 3)
	return errmsg("\"%s\" pattern not found", PROC_MTD_PATT);

	p = memchr(pi->next, '\"', pi->data_size - pos);
	if (!p)
	return errmsg("opening \" not fount");
	p += 1;
	pos = p - pi->buf;
	if (pos >= pi->data_size)
	return errmsg("opening \" not fount");

	p1 = memchr(p, '\"', pi->data_size - pos);
	if (!p1)
	return errmsg("closing \" not fount");
	pos = p1 - pi->buf;
	if (pos >= pi->data_size)
	return errmsg("closing \" not fount");

	len = p1 - p;
	if (len > MTD_NAME_MAX)
	return errmsg("too long mtd%d device name", pi->dev_num);

	memcpy(pi->name, p, len);
	pi->name[len] = '\0';

	if (p1[1] != '\n')
	return errmsg("opening \"\n\" not fount");
	pi->next = p1 + 2;
	return 1;
	}

	/**
	* legacy_libmtd_open - legacy version of 'libmtd_open()'.
	*
	* This function is just checks that MTD is present in the system. Returns
	* zero in case of success and %-1 in case of failure. In case of failure,
	* errno contains zero if MTD is not present in the system, or contains the
	* error code if a real error happened. This is similar to the 'libmtd_open()'
	* return conventions.
	*/
	int legacy_libmtd_open(void)
	{
	int fd;

	fd = open(MTD_PROC_FILE, O_RDONLY);
	if (fd == -1) {
	if (errno == ENOENT)
	errno = 0;
	return -1;
	}

	close(fd);
	return 0;
	}

	/**
	* legacy_mtd_get_info - legacy version of 'mtd_get_info()'.
	* @info: the MTD device information is returned here
	*
	* This function is similar to 'mtd_get_info()' and has the same conventions.
	*/
	int legacy_mtd_get_info(struct mtd_info *info)
	{
	int ret;
	struct proc_parse_info pi;

	ret = proc_parse_start(&pi);
	if (ret)
	return -1;

	info->lowest_dev_num = INT_MAX;
	while (proc_parse_next(&pi)) {
	info->dev_count += 1;
	if (pi.dev_num > info->highest_dev_num)
	info->highest_dev_num = pi.dev_num;
	if (pi.dev_num < info->lowest_dev_num)
	info->lowest_dev_num = pi.dev_num;
	}

	return 0;
	}

	/**
	* legacy_get_dev_info - legacy version of 'mtd_get_dev_info()'.
	* @node: name of the MTD device node
	* @mtd: the MTD device information is returned here
	*
	* This function is similar to 'mtd_get_dev_info()' and has the same
	* conventions.
	*/
	int legacy_get_dev_info(const char node, struct mtd_dev_info mtd)
	{
	struct stat st;
	struct mtd_info_user ui;
	int fd, ret;
	loff_t offs = 0;
	struct proc_parse_info pi;

	if (stat(node, &st)) {
	sys_errmsg("cannot open \"%s\"", node);
	if (errno == ENOENT)
	normsg("MTD subsystem is old and does not support "
	"sysfs, so MTD character device nodes have "
	"to exist");
	}

	if (!S_ISCHR(st.st_mode)) {
	errno = EINVAL;
	return errmsg("\"%s\" is not a character device", node);
	}

	memset(mtd, '\0', sizeof(struct mtd_dev_info));
	mtd->major = major(st.st_rdev);
	mtd->minor = minor(st.st_rdev);

	if (mtd->major != MTD_DEV_MAJOR) {
	errno = EINVAL;
	return errmsg("\"%s\" has major number %d, MTD devices have "
	"major %d", node, mtd->major, MTD_DEV_MAJOR);
	}

	mtd->dev_num = mtd->minor / 2;

	fd = open(node, O_RDWR);
	if (fd == -1)
	return sys_errmsg("cannot open \"%s\"", node);

	if (ioctl(fd, MEMGETINFO, &ui)) {
	sys_errmsg("MEMGETINFO ioctl request failed");
	goto out_close;
	}

	ret = ioctl(fd, MEMGETBADBLOCK, &offs);
	if (ret == -1) {
	if (errno != EOPNOTSUPP) {
	sys_errmsg("MEMGETBADBLOCK ioctl failed");
	goto out_close;
	}
	errno = 0;
	mtd->bb_allowed = 0;
	} else
	mtd->bb_allowed = 1;

	mtd->type = ui.type;
	mtd->size = ui.size;
	mtd->eb_size = ui.erasesize;
	mtd->min_io_size = ui.writesize;

	if (mtd->min_io_size <= 0) {
	errmsg("mtd%d (%s) has insane min. I/O unit size %d",
	mtd->dev_num, node, mtd->min_io_size);
	goto out_close;
	}
	if (mtd->eb_size <= 0 \|\| mtd->eb_size < mtd->min_io_size) {
	errmsg("mtd%d (%s) has insane eraseblock size %d",
	mtd->dev_num, node, mtd->eb_size);
	goto out_close;
	}
	if (mtd->size <= 0 \|\| mtd->size < mtd->eb_size) {
	errmsg("mtd%d (%s) has insane size %lld",
	mtd->dev_num, node, mtd->size);
	goto out_close;
	}
	mtd->eb_cnt = mtd->size / mtd->eb_size;

	switch(mtd->type) {
	case MTD_ABSENT:
	errmsg("mtd%d (%s) is removable and is not present",
	mtd->dev_num, node);
	goto out_close;
	case MTD_RAM:
	strcpy((char *)mtd->type_str, "ram");
	break;
	case MTD_ROM:
	strcpy((char *)mtd->type_str, "rom");
	break;
	case MTD_NORFLASH:
	strcpy((char *)mtd->type_str, "nor");
	break;
	case MTD_NANDFLASH:
	strcpy((char *)mtd->type_str, "nand");
	break;
	case MTD_DATAFLASH:
	strcpy((char *)mtd->type_str, "dataflash");
	break;
	case MTD_UBIVOLUME:
	strcpy((char *)mtd->type_str, "ubi");
	break;
	default:
	goto out_close;
	}

	if (ui.flags & MTD_WRITEABLE)
	mtd->writable = 1;
	mtd->subpage_size = mtd->min_io_size;

	close(fd);

	/*
	* Unfortunately, the device name is not available via ioctl, and
	* we have to parse /proc/mtd to get it.
	*/
	ret = proc_parse_start(&pi);
	if (ret)
	return -1;

	while (proc_parse_next(&pi)) {
	if (pi.dev_num == mtd->dev_num) {
	strcpy((char *)mtd->name, pi.name);
	return 0;
	}
	}

	errmsg("mtd%d not found in \"%s\"", mtd->dev_num, MTD_PROC_FILE);
	errno = ENOENT;
	return -1;

	out_close:
	close(fd);
	return -1;
	}

	/**
	* legacy_get_dev_info1 - legacy version of 'mtd_get_dev_info1()'.
	* @node: name of the MTD device node
	* @mtd: the MTD device information is returned here
	*
	* This function is similar to 'mtd_get_dev_info1()' and has the same
	* conventions.
	*/
	int legacy_get_dev_info1(int dev_num, struct mtd_dev_info *mtd)
	{
	char node[sizeof(MTD_DEV_PATT) + 20];

	sprintf(node, MTD_DEV_PATT, dev_num);
	return legacy_get_dev_info(node, mtd);
	}