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libubi.c
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/*
* Copyright (c) International Business Machines Corp., 2006
*
* 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
*
* UBI (Unsorted Block Images) library.
*/
#define PROGRAM_NAME "libubi"
#include <sys/sysmacros.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <dirent.h>
#include <unistd.h>
#include <limits.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "libubi.h"
#include "libubi_int.h"
/**
* mkpath - compose full path from 2 given components.
* @path: the first component
* @name: the second component
*
* This function returns the resulting path in case of success and %NULL in
* case of failure.
*/
static char *mkpath(const char *path, const char *name)
{
char *n;
int len1 = strlen(path);
int len2 = strlen(name);
n = malloc(len1 + len2 + 2);
if (!n) {
sys_errmsg("cannot allocate %d bytes", len1 + len2 + 2);
return NULL;
}
memcpy(n, path, len1);
if (n[len1 - 1] != '/')
n[len1++] = '/';
memcpy(n + len1, name, len2 + 1);
return n;
}
/**
* read_positive_ll - read a positive 'long long' value from a file.
* @file: the file to read from
* @value: the result is stored here
*
* This function reads file @file and interprets its contents as a positive
* 'long long' integer. If this is not true, it fails with %EINVAL error code.
* Returns %0 in case of success and %-1 in case of failure.
*/
static int read_positive_ll(const char *file, long long *value)
{
int fd, rd;
char buf[50];
fd = open(file, O_RDONLY);
if (fd == -1)
return -1;
rd = read(fd, buf, sizeof(buf));
if (rd == -1) {
sys_errmsg("cannot read \"%s\"", file);
goto out_error;
}
if (rd == sizeof(buf)) {
errmsg("contents of \"%s\" is too long", file);
errno = EINVAL;
goto out_error;
}
buf[rd] = '\0';
if (sscanf(buf, "%lld\n", value) != 1) {
errmsg("cannot read integer from \"%s\"\n", file);
errno = EINVAL;
goto out_error;
}
if (*value < 0) {
errmsg("negative value %lld in \"%s\"", *value, file);
errno = EINVAL;
goto out_error;
}
if (close(fd)) {
sys_errmsg("close failed on \"%s\"", file);
return -1;
}
return 0;
out_error:
close(fd);
return -1;
}
/**
* read_positive_int - read a positive 'int' value from a file.
* @file: the file to read from
* @value: the result is stored here
*
* This function is the same as 'read_positive_ll()', but it reads an 'int'
* value, not 'long long'.
*/
static int read_positive_int(const char *file, int *value)
{
long long res;
if (read_positive_ll(file, &res))
return -1;
/* Make sure the value is not too big */
if (res > INT_MAX) {
errmsg("value %lld read from file \"%s\" is out of range",
res, file);
errno = EINVAL;
return -1;
}
*value = res;
return 0;
}
/**
* read_data - read data from a file.
* @file: the file to read from
* @buf: the buffer to read to
* @buf_len: buffer length
*
* This function returns number of read bytes in case of success and %-1 in
* case of failure. Note, if the file contains more then @buf_len bytes of
* date, this function fails with %EINVAL error code.
*/
static int read_data(const char *file, void *buf, int buf_len)
{
int fd, rd, tmp, tmp1;
fd = open(file, O_RDONLY);
if (fd == -1)
return -1;
rd = read(fd, buf, buf_len);
if (rd == -1) {
sys_errmsg("cannot read \"%s\"", file);
goto out_error;
}
if (rd == buf_len) {
errmsg("contents of \"%s\" is too long", file);
errno = EINVAL;
goto out_error;
}
((char *)buf)[rd] = '\0';
/* Make sure all data is read */
tmp1 = read(fd, &tmp, 4);
if (tmp1 < 0) {
sys_errmsg("cannot read \"%s\"", file);
goto out_error;
}
if (tmp1) {
errmsg("file \"%s\" contains too much data (> %d bytes)",
file, buf_len);
errno = EINVAL;
goto out_error;
}
if (close(fd)) {
sys_errmsg("close failed on \"%s\"", file);
return -1;
}
return rd;
out_error:
close(fd);
return -1;
}
/**
* read_major - read major and minor numbers from a file.
* @file: name of the file to read from
* @major: major number is returned here
* @minor: minor number is returned here
*
* This function returns % in case of succes, and %-1 in case of failure.
*/
static int read_major(const char *file, int *major, int *minor)
{
int ret;
char buf[50];
ret = read_data(file, buf, 50);
if (ret < 0)
return ret;
ret = sscanf(buf, "%d:%d\n", major, minor);
if (ret != 2) {
errno = EINVAL;
errmsg("\"%s\" does not have major:minor format", file);
return -1;
}
if (*major < 0 || *minor < 0) {
errno = EINVAL;
errmsg("bad major:minor %d:%d in \"%s\"",
*major, *minor, file);
return -1;
}
return 0;
}
/**
* dev_read_int - read a positive 'int' value from an UBI device sysfs file.
* @patt: file pattern to read from
* @dev_num: UBI device number
* @value: the result is stored here
*
* This function returns %0 in case of success and %-1 in case of failure.
*/
static int dev_read_int(const char *patt, int dev_num, int *value)
{
char file[strlen(patt) + 50];
sprintf(file, patt, dev_num);
return read_positive_int(file, value);
}
/**
* vol_read_int - read a positive 'int' value from an UBI volume sysfs file.
* @patt: file pattern to read from
* @dev_num: UBI device number
* @vol_id: volume ID
* @value: the result is stored here
*
* This function returns %0 in case of success and %-1 in case of failure.
*/
static int vol_read_int(const char *patt, int dev_num, int vol_id, int *value)
{
char file[strlen(patt) + 100];
sprintf(file, patt, dev_num, vol_id);
return read_positive_int(file, value);
}
/**
* dev_read_ll - read a positive 'long long' value from an UBI device sysfs file.
* @patt: file pattern to read from
* @dev_num: UBI device number
* @value: the result is stored here
*
* This function returns %0 in case of success and %-1 in case of failure.
*/
static int dev_read_ll(const char *patt, int dev_num, long long *value)
{
char file[strlen(patt) + 50];
sprintf(file, patt, dev_num);
return read_positive_ll(file, value);
}
/**
* vol_read_ll - read a positive 'long long' value from an UBI volume sysfs file.
* @patt: file pattern to read from
* @dev_num: UBI device number
* @vol_id: volume ID
* @value: the result is stored here
*
* This function returns %0 in case of success and %-1 in case of failure.
*/
static int vol_read_ll(const char *patt, int dev_num, int vol_id,
long long *value)
{
char file[strlen(patt) + 100];
sprintf(file, patt, dev_num, vol_id);
return read_positive_ll(file, value);
}
/**
* vol_read_data - read data from an UBI volume's sysfs file.
* @patt: file pattern to read from
* @dev_num: UBI device number
* @vol_id: volume ID
* @buf: buffer to read to
* @buf_len: buffer length
*
* This function returns number of read bytes in case of success and %-1 in
* case of failure.
*/
static int vol_read_data(const char *patt, int dev_num, int vol_id, void *buf,
int buf_len)
{
char file[strlen(patt) + 100];
sprintf(file, patt, dev_num, vol_id);
return read_data(file, buf, buf_len);
}
/**
* dev_get_major - get major and minor numbers of an UBI device.
* @lib: libubi descriptor
* @dev_num: UBI device number
* @major: major number is returned here
* @minor: minor number is returned here
*
* This function returns zero in case of succes and %-1 in case of failure.
*/
static int dev_get_major(struct libubi *lib, int dev_num, int *major, int *minor)
{
char file[strlen(lib->dev_dev) + 50];
sprintf(file, lib->dev_dev, dev_num);
return read_major(file, major, minor);
}
/**
* vol_get_major - get major and minor numbers of an UBI volume.
* @lib: libubi descriptor
* @dev_num: UBI device number
* @vol_id: volume ID
* @major: major number is returned here
* @minor: minor number is returned here
*
* This function returns zero in case of succes and %-1 in case of failure.
*/
static int vol_get_major(struct libubi *lib, int dev_num, int vol_id,
int *major, int *minor)
{
char file[strlen(lib->vol_dev) + 100];
sprintf(file, lib->vol_dev, dev_num, vol_id);
return read_major(file, major, minor);
}
/**
* vol_node2nums - find UBI device number and volume ID by volume device node
* file.
* @lib: UBI library descriptor
* @node: UBI character device node name
* @dev_num: UBI device number is returned here
* @vol_id: volume ID is returned hers
*
* This function returns zero in case of succes and %-1 in case of failure.
*/
static int vol_node2nums(struct libubi *lib, const char *node, int *dev_num,
int *vol_id)
{
struct stat st;
struct ubi_info info;
int i, fd, major, minor;
char file[strlen(lib->ubi_vol) + 100];
if (stat(node, &st)) {
sys_errmsg("cannot get information about \"%s\"",
node);
return -1;
}
if (!S_ISCHR(st.st_mode)) {
errno = EINVAL;
errmsg("\"%s\" is not a character device", node);
return -1;
}
major = major(st.st_rdev);
minor = minor(st.st_rdev);
if (minor == 0) {
errno = EINVAL;
errmsg("\"%s\" is not a volume character device", node);
return -1;
}
if (ubi_get_info((libubi_t *)lib, &info))
return -1;
for (i = info.lowest_dev_num; i <= info.highest_dev_num; i++) {
int major1, minor1, ret;
ret = dev_get_major(lib, i, &major1, &minor1);
if (ret) {
if (errno == ENOENT)
continue;
return -1;
}
if (major1 == major)
break;
}
if (i > info.highest_dev_num) {
errno = ENODEV;
return -1;
}
/* Make sure this UBI volume exists */
sprintf(file, lib->ubi_vol, i, minor - 1);
fd = open(file, O_RDONLY);
if (fd < 0) {
errno = ENODEV;
return -1;
}
close(fd);
*dev_num = i;
*vol_id = minor - 1;
errno = 0;
return 0;
}
/**
* dev_node2num - find UBI device number by its character device node.
* @lib: UBI library descriptor
* @node: UBI character device node name
* @dev_num: UBI device number is returned here
*
* This function returns %0 in case of success and %-1 in case of failure.
*/
static int dev_node2num(struct libubi *lib, const char *node, int *dev_num)
{
struct stat st;
struct ubi_info info;
int i, major, minor;
if (stat(node, &st)) {
sys_errmsg("cannot get information about \"%s\"", node);
return -1;
}
if (!S_ISCHR(st.st_mode)) {
errno = EINVAL;
errmsg("\"%s\" is not a character device", node);
return -1;
}
major = major(st.st_rdev);
minor = minor(st.st_rdev);
if (minor != 0) {
errno = EINVAL;
errmsg("\"%s\" is not an UBI character device", node);
return -1;
}
if (ubi_get_info((libubi_t *)lib, &info))
return -1;
for (i = info.lowest_dev_num; i <= info.highest_dev_num; i++) {
int major1, minor1, ret;
ret = dev_get_major(lib, i, &major1, &minor1);
if (ret) {
if (errno == ENOENT)
continue;
return -1;
}
if (major1 == major) {
if (minor1 != 0) {
errmsg("UBI character device minor number is "
"%d, but must be 0", minor1);
errno = EINVAL;
return -1;
}
errno = 0;
*dev_num = i;
return 0;
}
}
errno = ENODEV;
return -1;
}
int mtd_num2ubi_dev(libubi_t desc, int mtd_num, int *dev_num)
{
struct ubi_info info;
int i, ret, mtd_num1;
struct libubi *lib = desc;
if (ubi_get_info(desc, &info))
return -1;
for (i = info.lowest_dev_num; i <= info.highest_dev_num; i++) {
ret = dev_read_int(lib->dev_mtd_num, i, &mtd_num1);
if (ret) {
if (errno == ENOENT)
continue;
return -1;
}
if (mtd_num1 == mtd_num) {
errno = 0;
*dev_num = i;
return 0;
}
}
errno = 0;
return -1;
}
libubi_t libubi_open(void)
{
int fd, version;
struct libubi *lib;
lib = calloc(1, sizeof(struct libubi));
if (!lib)
return NULL;
lib->sysfs_ctrl = mkpath("/sys", SYSFS_CTRL);
if (!lib->sysfs_ctrl)
goto out_error;
lib->ctrl_dev = mkpath(lib->sysfs_ctrl, CTRL_DEV);
if (!lib->ctrl_dev)
goto out_error;
lib->sysfs_ubi = mkpath("/sys", SYSFS_UBI);
if (!lib->sysfs_ubi)
goto out_error;
/* Make sure UBI is present */
fd = open(lib->sysfs_ubi, O_RDONLY);
if (fd == -1) {
errno = 0;
goto out_error;
}
if (close(fd)) {
sys_errmsg("close failed on \"%s\"", lib->sysfs_ubi);
goto out_error;
}
lib->ubi_dev = mkpath(lib->sysfs_ubi, UBI_DEV_NAME_PATT);
if (!lib->ubi_dev)
goto out_error;
lib->ubi_version = mkpath(lib->sysfs_ubi, UBI_VER);
if (!lib->ubi_version)
goto out_error;
lib->dev_dev = mkpath(lib->ubi_dev, DEV_DEV);
if (!lib->dev_dev)
goto out_error;
lib->dev_avail_ebs = mkpath(lib->ubi_dev, DEV_AVAIL_EBS);
if (!lib->dev_avail_ebs)
goto out_error;
lib->dev_total_ebs = mkpath(lib->ubi_dev, DEV_TOTAL_EBS);
if (!lib->dev_total_ebs)
goto out_error;
lib->dev_bad_count = mkpath(lib->ubi_dev, DEV_BAD_COUNT);
if (!lib->dev_bad_count)
goto out_error;
lib->dev_eb_size = mkpath(lib->ubi_dev, DEV_EB_SIZE);
if (!lib->dev_eb_size)
goto out_error;
lib->dev_max_ec = mkpath(lib->ubi_dev, DEV_MAX_EC);
if (!lib->dev_max_ec)
goto out_error;
lib->dev_bad_rsvd = mkpath(lib->ubi_dev, DEV_MAX_RSVD);
if (!lib->dev_bad_rsvd)
goto out_error;
lib->dev_max_vols = mkpath(lib->ubi_dev, DEV_MAX_VOLS);
if (!lib->dev_max_vols)
goto out_error;
lib->dev_min_io_size = mkpath(lib->ubi_dev, DEV_MIN_IO_SIZE);
if (!lib->dev_min_io_size)
goto out_error;
lib->dev_mtd_num = mkpath(lib->ubi_dev, DEV_MTD_NUM);
if (!lib->dev_mtd_num)
goto out_error;
lib->ubi_vol = mkpath(lib->sysfs_ubi, UBI_VOL_NAME_PATT);
if (!lib->ubi_vol)
goto out_error;
lib->vol_type = mkpath(lib->ubi_vol, VOL_TYPE);
if (!lib->vol_type)
goto out_error;
lib->vol_dev = mkpath(lib->ubi_vol, VOL_DEV);
if (!lib->vol_dev)
goto out_error;
lib->vol_alignment = mkpath(lib->ubi_vol, VOL_ALIGNMENT);
if (!lib->vol_alignment)
goto out_error;
lib->vol_data_bytes = mkpath(lib->ubi_vol, VOL_DATA_BYTES);
if (!lib->vol_data_bytes)
goto out_error;
lib->vol_rsvd_ebs = mkpath(lib->ubi_vol, VOL_RSVD_EBS);
if (!lib->vol_rsvd_ebs)
goto out_error;
lib->vol_eb_size = mkpath(lib->ubi_vol, VOL_EB_SIZE);
if (!lib->vol_eb_size)
goto out_error;
lib->vol_corrupted = mkpath(lib->ubi_vol, VOL_CORRUPTED);
if (!lib->vol_corrupted)
goto out_error;
lib->vol_name = mkpath(lib->ubi_vol, VOL_NAME);
if (!lib->vol_name)
goto out_error;
if (read_positive_int(lib->ubi_version, &version))
goto out_error;
if (version != LIBUBI_UBI_VERSION) {
errmsg("this library was made for UBI version %d, but UBI "
"version %d is detected\n", LIBUBI_UBI_VERSION, version);
goto out_error;
}
return lib;
out_error:
libubi_close((libubi_t)lib);
return NULL;
}
void libubi_close(libubi_t desc)
{
struct libubi *lib = (struct libubi *)desc;
free(lib->vol_name);
free(lib->vol_corrupted);
free(lib->vol_eb_size);
free(lib->vol_rsvd_ebs);
free(lib->vol_data_bytes);
free(lib->vol_alignment);
free(lib->vol_dev);
free(lib->vol_type);
free(lib->ubi_vol);
free(lib->dev_mtd_num);
free(lib->dev_min_io_size);
free(lib->dev_max_vols);
free(lib->dev_bad_rsvd);
free(lib->dev_max_ec);
free(lib->dev_eb_size);
free(lib->dev_bad_count);
free(lib->dev_total_ebs);
free(lib->dev_avail_ebs);
free(lib->dev_dev);
free(lib->ubi_version);
free(lib->ubi_dev);
free(lib->sysfs_ubi);
free(lib->ctrl_dev);
free(lib->sysfs_ctrl);
free(lib);
}
/**
* do_attach - perform the actual attach operation.
* @node: name of the UBI control character device node
* @r: attach request
*
* This function performs the actual UBI attach operation. Returns %0 in case of
* success and %-1 in case of failure. @r->ubi_num contains newly created UBI
* device number.
*/
static int do_attach(const char *node, const struct ubi_attach_req *r)
{
int fd, ret;
fd = open(node, O_RDONLY);
if (fd == -1) {
sys_errmsg("cannot open \"%s\"", node);
return -1;
}
ret = ioctl(fd, UBI_IOCATT, r);
close(fd);
if (ret == -1)
return -1;
#ifdef UDEV_SETTLE_HACK
// if (system("udevsettle") == -1)
// return -1;
usleep(100000);
#endif
return ret;
}
#ifndef MTD_CHAR_MAJOR
/*
* This is taken from kernel <linux/mtd/mtd.h> and is unlikely to change anytime
* soon.
*/
#define MTD_CHAR_MAJOR 90
#endif
/**
* mtd_node_to_num - converts device node to MTD number.
* @mtd_dev_node: path to device node to convert
*
* This function converts given @mtd_dev_node to MTD device number.
* @mtd_dev_node should contain path to the MTD device node. Returns MTD device
* number in case of success and %-1 in case of failure (errno is set).
*/
static int mtd_node_to_num(const char *mtd_dev_node)
{
int major, minor;
struct stat sb;
if (stat(mtd_dev_node, &sb) < 0) {
sys_errmsg("cannot stat \"%s\"", mtd_dev_node);
return -1;
}
if (!S_ISCHR(sb.st_mode)) {
errno = EINVAL;
sys_errmsg("\"%s\" is not a character device",
mtd_dev_node);
return -1;
}
major = major(sb.st_rdev);
minor = minor(sb.st_rdev);
if (major != MTD_CHAR_MAJOR) {
errno = EINVAL;
sys_errmsg("\"%s\" is not an MTD device", mtd_dev_node);
return -1;
}
return minor / 2;
}
int ubi_attach(libubi_t desc, const char *node, struct ubi_attach_request *req)
{
struct ubi_attach_req r;
int ret;
(void)desc;
if (req->mtd_dev_node) {
/*
* User has passed path to device node. Lets find out MTD
* device number of the device and update req->mtd_num with it
*/
req->mtd_num = mtd_node_to_num(req->mtd_dev_node);
if (req->mtd_num == -1)
return -1;
}
memset(&r, 0, sizeof(struct ubi_attach_req));
r.ubi_num = req->dev_num;
r.mtd_num = req->mtd_num;
r.vid_hdr_offset = req->vid_hdr_offset;
if (req->max_beb_per1024) {
/*
* We first have to check if the running kernel supports the
* 'max_beb_per1024' parameter. To do this, we invoke the
* "attach" ioctl 2 times: first with incorrect value %-1 of
* 'max_beb_per1024'.
*
* If the ioctl succeeds, it means that the kernel doesn't
* support the feature and just ignored our 'max_beb_per1024'
* value.
*
* If the ioctl returns -EINVAL, we assume this is because
* 'max_beb_per1024' was set to -1, and we invoke the ioctl for
* the second time with the 'max_beb_per1024' value.
*/
r.max_beb_per1024 = -1;
ret = do_attach(node, &r);
if (ret == 0) {
req->dev_num = r.ubi_num;
/*
* The call succeeded. It means that the kernel ignored
* 'max_beb_per1024' parameter.
*/
return 1;
} else if (errno != EINVAL)
return ret;
}
r.max_beb_per1024 = req->max_beb_per1024;
ret = do_attach(node, &r);
if (ret == 0)
req->dev_num = r.ubi_num;
return ret;
}
int ubi_detach_mtd(libubi_t desc, const char *node, int mtd_num)
{
int ret, ubi_dev;
ret = mtd_num2ubi_dev(desc, mtd_num, &ubi_dev);
if (ret == -1) {
errno = ENODEV;
return ret;
}
return ubi_remove_dev(desc, node, ubi_dev);
}
int ubi_detach(libubi_t desc, const char *node, const char *mtd_dev_node)
{
int mtd_num;
if (!mtd_dev_node) {
errno = EINVAL;
return -1;
}
mtd_num = mtd_node_to_num(mtd_dev_node);
if (mtd_num == -1)
return -1;
return ubi_detach_mtd(desc, node, mtd_num);
}
int ubi_remove_dev(libubi_t desc, const char *node, int ubi_dev)
{
int fd, ret;
desc = desc;
fd = open(node, O_RDONLY);
if (fd == -1) {
sys_errmsg("cannot open \"%s\"", node);
return -1;
}
ret = ioctl(fd, UBI_IOCFDET, &ubi_dev);
if (ret == -1)
goto out_close;
#ifdef UDEV_SETTLE_HACK
// if (system("udevsettle") == -1)
// return -1;
usleep(100000);
#endif
out_close:
close(fd);
return ret;
}
int ubi_probe_node(libubi_t desc, const char *node)
{
struct stat st;
struct ubi_info info;
int i, fd, major, minor;
struct libubi *lib = (struct libubi *)desc;
char file[strlen(lib->ubi_vol) + 100];
if (stat(node, &st)) {
sys_errmsg("cannot get information about \"%s\"", node);
return -1;
}
if (!S_ISCHR(st.st_mode)) {
errmsg("\"%s\" is not a character device", node);
errno = EINVAL;
return -1;
}
major = major(st.st_rdev);
minor = minor(st.st_rdev);
if (ubi_get_info((libubi_t *)lib, &info))
return -1;
for (i = info.lowest_dev_num; i <= info.highest_dev_num; i++) {
int major1, minor1, ret;
ret = dev_get_major(lib, i, &major1, &minor1);
if (ret) {
if (errno == ENOENT)
continue;
if (!errno)
goto out_not_ubi;
return -1;
}
if (major1 == major)
break;
}
if (i > info.highest_dev_num)
goto out_not_ubi;
if (minor == 0)
return 1;
/* This is supposdely an UBI volume device node */
sprintf(file, lib->ubi_vol, i, minor - 1);
fd = open(file, O_RDONLY);
if (fd < 0)
goto out_not_ubi;
close(fd);
return 2;
out_not_ubi:
errmsg("\"%s\" has major:minor %d:%d, but this does not correspond to "
"any existing UBI device or volume", node, major, minor);
errno = ENODEV;
return -1;
}
int ubi_get_info(libubi_t desc, struct ubi_info *info)
{
DIR *sysfs_ubi;
struct dirent *dirent;
struct libubi *lib = (struct libubi *)desc;
memset(info, 0, sizeof(struct ubi_info));
if (read_major(lib->ctrl_dev, &info->ctrl_major, &info->ctrl_minor)) {
/*
* Older UBI versions did not have control device, so we do not
* panic here for compatibility reasons. May be few years later
* we could return -1 here, but for now just set major:minor to
* -1.
*/
info->ctrl_major = info->ctrl_minor = -1;
}
/*
* We have to scan the UBI sysfs directory to identify how many UBI
* devices are present.
*/
sysfs_ubi = opendir(lib->sysfs_ubi);
if (!sysfs_ubi)
return -1;
info->lowest_dev_num = INT_MAX;
while (1) {
int dev_num, ret;
char tmp_buf[256];
errno = 0;
dirent = readdir(sysfs_ubi);
if (!dirent)
break;
if (strlen(dirent->d_name) >= 255) {
errmsg("invalid entry in %s: \"%s\"",
lib->sysfs_ubi, dirent->d_name);
errno = EINVAL;
goto out_close;
}
ret = sscanf(dirent->d_name, UBI_DEV_NAME_PATT"%s",
&dev_num, tmp_buf);
if (ret == 1) {
info->dev_count += 1;
if (dev_num > info->highest_dev_num)
info->highest_dev_num = dev_num;
if (dev_num < info->lowest_dev_num)
info->lowest_dev_num = dev_num;
}
}
if (!dirent && errno) {
sys_errmsg("readdir failed on \"%s\"", lib->sysfs_ubi);
goto out_close;