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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.
*/
/*
* UBI (Unsorted Block Images) library.
*
* Author: Artem B. Bityutskiy
* Oliver Lohmann
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <limits.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <stdint.h>
#include <mtd/ubi-user.h>
#include <mtd/ubi-header.h>
#include "libubi.h"
#include "libubi_int.h"
#include "libubi_sysfs.h"
/**
* struct ubi_lib - UBI library descriptor.
*
* @ubi general UBI information
*
* @sysfs_root sysfs root directory
* @ubi_root UBI root directory in sysfs
*
* @version full path to the "UBI version" sysfs file
*
* @cdev_path path pattern to UBI character devices
* @cdev_path_len maximum length of the @cdev_path string after substitution
* @udev_path path to sysfs directories corresponding to UBI devices
* @wear_path path to sysfs file containing UBI wear information
* @vol_count_path path to sysfs file containing the number of volumes in an
* UBI device
* @tot_ebs_path path to sysfs file containing the total number of
* eraseblock on an UBI device
* @avail_ebs_path path to sysfs file containing the number of unused
* eraseblocks on an UBI device, available for new volumes
* @eb_size_path path to sysfs file containing size of UBI eraseblocks
* @nums_path path to sysfs file containing major and minor number of an
* UBI device
* @vol_cdev_path path to UBI volume character devices
* @vdev_path path to sysfs directories corresponding to UBI volume
* devices
* @vol_nums_path path to sysfs file containing major and minor number of an
* UBI volume device
* @vol_bytes_path path to sysfs file containing size of an UBI volume device
* in bytes
* @vol_ebs_path path to sysfs file containing the number of eraseblocks in
* an UBI volume device
* @vol_type_path path to sysfs file containing type of an UBI volume
* @vol_name_path @FIXME: Describe me.
*
* This structure is created and initialized by 'ubi_init()' and is passed to
* all UBI library calls.
*/
struct ubi_lib
{
struct ubi_info ubi;
char *sysfs_root;
char *ubi_root;
char *version;
char *cdev_path;
int cdev_path_len;
char *udev_path;
char *wear_path;
char *vol_count_path;
char *tot_ebs_path;
char *avail_ebs_path;
char *eb_size_path;
char *nums_path;
int vol_cdev_path_len;
char *vol_cdev_path;
char *vdev_path;
char *vol_nums_path;
char *vol_bytes_path;
char *vol_ebs_path;
char *vol_type_path;
char *vol_name_path;
};
/**
* mkpath - compose full path from 2 given components.
*
* @path first component @name second component
*
* Returns the resulting path in case of success and %NULL in case of failure.
* Callers have to take care the resulting path is freed.
*/
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)
return NULL;
memcpy(n, path, len1);
if (n[len1 - 1] != '/')
n[len1++] = '/';
memcpy(n + len1, name, len2 + 1);
return n;
}
static int
get_ubi_info(ubi_lib_t desc, struct ubi_info *ubi)
{
int err;
int n = 1;
char *path;
struct stat stat;
err = sysfs_read_int(desc->version, (int*) &ubi->version);
if (err)
return -1;
/* Calculate number of UBI devices */
do {
char dir[20];
sprintf(&dir[0], "ubi%d", n);
path = mkpath(desc->sysfs_root, dir);
if (!path)
return ENOMEM;
err = lstat(path, &stat);
if (err == 0)
n += 1;
free(path);
} while (err == 0);
if (errno != ENOENT)
return -1;
if (n == 0) {
ubi_err("no UBI devices found");
errno = EINVAL;
return -1;
}
errno = 0;
ubi->dev_count = n;
return 0;
}
void
ubi_dump_handler(ubi_lib_t desc)
{
ubi_lib_t d = desc;
printf( "UBI Library Descriptor:\n"
"ubi_root: %s\n"
"version: %s\n"
"cdev_path: %s\n"
"udev_path: %s\n"
"wear_path: %s\n"
"vol_count_path: %s\n"
"tot_ebs_path: %s\n"
"avail_ebs_path: %s\n"
"eb_size_path: %s\n"
"nums_path: %s\n"
"vol_cdev_path: %s\n"
"vdev_path: %s\n"
"vol_nums_path: %s\n"
"vol_bytes_path: %s\n"
"vol_ebs_path: %s\n"
"vol_type_path: %s\n"
"vol_name_path: %s\n"
"cdev_path_len: %d\n\n",
d->ubi_root, d->version, d->cdev_path, d->udev_path,
d->wear_path, d->vol_count_path, d->tot_ebs_path,
d->avail_ebs_path, d->eb_size_path, d->nums_path,
d->vol_cdev_path, d->vdev_path, d->vol_nums_path,
d->vol_bytes_path, d->vol_ebs_path, d->vol_type_path,
d->vol_name_path, d->cdev_path_len);
}
int
ubi_set_cdev_pattern(ubi_lib_t desc, const char *pattern)
{
char *patt;
patt = strdup(pattern);
if (!patt) {
ubi_err("cannot allocate memory");
return -1;
}
if (desc->cdev_path)
free(desc->cdev_path);
desc->cdev_path = patt;
desc->cdev_path_len = strlen(patt) + 1 + UBI_MAX_ID_SIZE;
ubi_dbg("ubi dev pattern is now \"%s\"", patt);
return 0;
}
int
ubi_set_vol_cdev_pattern(ubi_lib_t desc, const char *pattern)
{
char *patt;
patt = strdup(pattern);
if (!patt) {
ubi_err("cannot allocate memory");
return -1;
}
free(desc->vol_cdev_path);
desc->vol_cdev_path = patt;
desc->vol_cdev_path_len = strlen(patt) + 1 + 2 * UBI_MAX_ID_SIZE;
ubi_dbg("ubi volume dev pattern is now \"%s\"", patt);
return 0;
}
int
ubi_open(ubi_lib_t *desc)
{
int err = -1;
ubi_lib_t res;
struct stat stat;
res = calloc(1, sizeof(struct ubi_lib));
if (!res) {
ubi_err("cannot allocate memory");
return -1;
}
res->cdev_path = NULL;
err = ubi_set_cdev_pattern(res, UBI_CDEV_PATH);
if (err)
goto error;
/* TODO: this actually has to be discovered */
res->sysfs_root = strdup(UBI_SYSFS_ROOT);
if (!res->sysfs_root)
goto error;
res->ubi_root = mkpath(res->sysfs_root, UBI_ROOT);
if (!res->ubi_root)
goto error;
res->version = mkpath(res->ubi_root, UBI_VER);
if (!res->version)
goto error;
res->udev_path = mkpath(res->ubi_root, "ubi%d/");
if (!res->udev_path)
goto error;
res->wear_path = mkpath(res->udev_path, UBI_WEAR);
if (!res->wear_path)
goto error;
res->vol_count_path = mkpath(res->udev_path, UBI_VOL_COUNT);
if (!res->vol_count_path)
goto error;
res->tot_ebs_path = mkpath(res->udev_path, UBI_AVAIL_EBS);
if (!res->tot_ebs_path)
goto error;
res->avail_ebs_path = mkpath(res->udev_path, UBI_TOT_EBS);
if (!res->avail_ebs_path)
goto error;
res->eb_size_path = mkpath(res->udev_path, UBI_EB_SIZE);
if (!res->eb_size_path)
goto error;
res->nums_path = mkpath(res->udev_path, UBI_NUMS);
if (!res->nums_path)
goto error;
err = ubi_set_vol_cdev_pattern(res, UBI_VOL_CDEV_PATH);
if (err)
goto error;
res->vdev_path = mkpath(res->udev_path, "%d/");
if (!res->vdev_path)
goto error;
res->vol_nums_path = mkpath(res->vdev_path, UBI_NUMS);
if (!res->vol_nums_path)
goto error;
res->vol_bytes_path = mkpath(res->vdev_path, UBI_VBYTES);
if (!res->vol_bytes_path)
goto error;
res->vol_ebs_path = mkpath(res->vdev_path, UBI_VEBS);
if (!res->vol_ebs_path)
goto error;
res->vol_type_path = mkpath(res->vdev_path, UBI_VTYPE);
if (!res->vol_type_path)
goto error;
res->vol_name_path = mkpath(res->vdev_path, UBI_VNAME);
if (!res->vol_name_path)
goto error;
/* Check if UBI exists in the system */
err = lstat(res->ubi_root, &stat);
if (err) {
perror("lstat");
fprintf(stderr, "%s\n", res->ubi_root);
err = UBI_ENOTFOUND;
goto error;
}
err = get_ubi_info(res, &res->ubi);
if (err)
goto error;
*desc = res;
ubi_dbg("opened library successfully.");
return 0;
error:
ubi_close(&res);
if (err == -1 && errno == ENOMEM)
ubi_err("Cannot allocate memory");
return err;
}
int
ubi_close(ubi_lib_t *desc)
{
ubi_lib_t tmp = *desc;
free(tmp->vol_name_path);
free(tmp->vol_type_path);
free(tmp->vol_ebs_path);
free(tmp->vol_bytes_path);
free(tmp->vol_nums_path);
free(tmp->vdev_path);
free(tmp->vol_cdev_path);
free(tmp->nums_path);
free(tmp->eb_size_path);
free(tmp->avail_ebs_path);
free(tmp->tot_ebs_path);
free(tmp->vol_count_path);
free(tmp->wear_path);
free(tmp->udev_path);
free(tmp->cdev_path);
free(tmp->version);
free(tmp->ubi_root);
free(tmp->sysfs_root);
free(tmp);
*desc = NULL;
return 0;
}
void
ubi_perror(const char *prefix, int code)
{
if (code == 0)
return;
fprintf(stderr, "%s: ", prefix);
switch (code) {
case UBI_ENOTFOUND:
fprintf(stderr, "UBI was not found in system\n");
break;
case UBI_EBUG:
fprintf(stderr, "an UBI or UBI library bug\n");
break;
case UBI_EINVAL:
fprintf(stderr, "invalid parameter\n");
break;
case -1:
perror(prefix);
break;
default:
ubi_err("unknown error code %d", code);
break;
}
}
int
ubi_get_dev_info(ubi_lib_t desc, unsigned int devn, struct ubi_dev_info *di)
{
int err;
if (devn >= desc->ubi.dev_count) {
ubi_err("bad device number, max is %d\n",
desc->ubi.dev_count - 1);
return UBI_EINVAL;
}
err = sysfs_read_dev_subst(desc->nums_path, &di->major,
&di->minor, 1, devn);
if (err)
return -1;
err = sysfs_read_ull_subst(desc->wear_path, &di->wear, 1, devn);
if (err)
return -1;
err = sysfs_read_uint_subst(desc->vol_count_path,
&di->vol_count, 1, devn);
if (err)
return -1;
err = sysfs_read_uint_subst(desc->eb_size_path, &di->eb_size, 1, devn);
if (err)
return -1;
err = sysfs_read_uint_subst(desc->tot_ebs_path, &di->total_ebs, 1, devn);
if (err)
return -1;
err = sysfs_read_uint_subst(desc->avail_ebs_path,
&di->avail_ebs, 1, devn);
if (err)
return -1;
#if 0
ubi_dbg("major:minor %d:%d, wear %llu, EB size %d, "
"vol. count %d, tot. EBs %d, avail. EBs %d",
di->major, di->minor, di->wear, di->eb_size,
di->vol_count, di->total_ebs, di->avail_ebs);
#endif
return err;
}
int
ubi_get_vol_info(ubi_lib_t desc, unsigned int devn, unsigned int vol_id,
struct ubi_vol_info *req)
{
int err;
int len;
char buf1[10];
char buf2[UBI_MAX_VOLUME_NAME];
err = sysfs_read_dev_subst(desc->vol_nums_path, &req->major,
&req->minor, 2, devn, vol_id);
if (err)
return -1;
err = sysfs_read_ull_subst(desc->vol_bytes_path,
&req->bytes, 2, devn, vol_id);
if (err)
return -1;
err = sysfs_read_uint_subst(desc->vol_ebs_path,
&req->eraseblocks, 2, devn, vol_id);
if (err)
return -1;
len = sysfs_read_data_subst(desc->vol_type_path, &buf1[0],
10, 2, devn, vol_id);
if (len == -1)
return -1;
if (buf1[len - 1] != '\n') {
ubi_err("bad volume type");
return UBI_EBUG;
}
if (!strncmp(&buf1[0], "static", sizeof("static") - 1)) {
req->type = UBI_STATIC_VOLUME;
} else if (!strncmp(&buf1[0], "dynamic", sizeof("dynamic") - 1)) {
req->type = UBI_DYNAMIC_VOLUME;
} else {
ubi_err("bad type %s", &buf1[0]);
return -1;
}
len = sysfs_read_data_subst(desc->vol_name_path, &buf2[0],
UBI_MAX_VOLUME_NAME, 2, devn, vol_id);
if (len == -1)
return -1;
if (buf2[len - 1] != '\n') {
ubi_err("bad volume name");
return UBI_EBUG;
}
req->name = malloc(len);
if (!req->name) {
ubi_err("cannot allocate memory");
return -1;
}
memcpy(req->name, &buf2[0], len - 1);
req->name[len - 1] = '\0';
return 0;
}
/**
* ubi_cdev_open - open a UBI device
*
* @desc UBI library descriptor
* @devn Number of UBI device to open
* @flags Flags to pass to open()
*
* This function opens a UBI device by number and returns a file
* descriptor. In case of an error %-1 is returned and errno is set
* appropriately.
*/
static int
ubi_cdev_open(ubi_lib_t desc, int devn, int flags)
{
char *buf;
int fd;
ubi_dbg("desc=%p, devn=%d, flags=%08x\n", desc, devn, flags);
if (desc == NULL) {
ubi_err("desc is NULL\n");
return -1;
}
if (desc->vol_cdev_path_len == 0) {
ubi_err("path_len == 0\n");
return -1;
}
buf = malloc(desc->cdev_path_len);
sprintf(buf, desc->cdev_path, devn);
fd = open(buf, flags);
if (fd == -1)
ubi_dbg("cannot open %s", buf);
free(buf);
return fd;
}
/**
* ubi_cdev_close - close a UBI device
*
* @dev_fd file descriptor of UBI device to close
*
* This function closes the given UBI device.
*/
static int
ubi_cdev_close(int dev_fd)
{
return close(dev_fd);
}
/**
* @size is now in bytes.
*/
int
ubi_mkvol(ubi_lib_t desc, int devn, int vol_id, int vol_type,
long long bytes, int alignment, const char *name)
{
int fd;
int err;
struct ubi_mkvol_req req;
if ((fd = ubi_cdev_open(desc, devn, O_RDWR)) == -1)
return -1;
req.vol_id = vol_id;
req.bytes = bytes;
req.vol_type = vol_type;
req.alignment = alignment;
req.name_len = strlen(name);
req.name = name;
/* printf("DBG: %s(vol_id=%d, bytes=%lld, type=%d, alig=%d, nlen=%d, "
"name=%s)\n", __func__, vol_id, bytes, vol_type, alignment,
strlen(name), name);*/
err = ioctl(fd, UBI_IOCMKVOL, &req);
if (err < 0) {
ubi_err("ioctl returned %d errno=%d\n", err, errno);
goto out_close;
}
ubi_dbg("created volume %d, size %lld, name \"%s\" "
"at UBI dev %d\n", vol_id, bytes, name, devn);
close(fd);
return err;
out_close:
ubi_cdev_close(fd);
return err;
}
int
ubi_rmvol(ubi_lib_t desc, int devn, int vol_id)
{
int fd;
int err;
if ((fd = ubi_cdev_open(desc, devn, O_RDWR)) == -1)
return -1;
err = ioctl(fd, UBI_IOCRMVOL, &vol_id);
if (err < 0)
goto out_close;
ubi_dbg("removed volume %d", vol_id);
out_close:
ubi_cdev_close(fd);
return err;
}
int
ubi_get_info(ubi_lib_t desc, struct ubi_info *ubi)
{
memcpy(ubi, &desc->ubi, sizeof(struct ubi_info));
return 0;
}
int
ubi_vol_open(ubi_lib_t desc, int devn, int vol_id, int flags)
{
char *buf;
int fd;
ubi_dbg("desc=%p, devn=%d, vol_id=%d, flags=%08x\n",
desc, devn, vol_id, flags);
if (desc == NULL) {
ubi_err("desc is NULL\n");
return -1;
}
if (desc->vol_cdev_path_len == 0) {
ubi_err("path_len == 0\n");
return -1;
}
buf = malloc(desc->cdev_path_len);
sprintf(buf, desc->vol_cdev_path, devn, vol_id);
fd = open(buf, flags);
if (fd == -1)
ubi_dbg("cannot open %s", buf);
free(buf);
return fd;
}
int
ubi_vol_close(int vol_fd)
{
return close(vol_fd);
}
int
ubi_vol_update(int vol_fd, unsigned long long bytes)
{
int err;
err = ioctl(vol_fd, UBI_IOCVOLUP, &bytes);
if (err) {
ubi_err("%s failure calling update ioctl\n"
" IOCTL(%08x) err=%d errno=%d\n",
__func__, UBI_IOCVOLUP, err, errno);
}
return err;
}
FILE *
ubi_vol_fopen_read(ubi_lib_t desc, int devn, uint32_t vol_id)
{
FILE *fp;
int fd;
fd = ubi_vol_open(desc, devn, vol_id, O_RDONLY);
if (fd == -1)
return NULL;
fp = fdopen(fd, "r");
if (fp == NULL)
ubi_vol_close(fd);
return fp;
}
FILE *
ubi_vol_fopen_update(ubi_lib_t desc, int devn, uint32_t vol_id,
unsigned long long bytes)
{
FILE *fp;
int fd;
int err;
fd = ubi_vol_open(desc, devn, vol_id, O_RDWR);
if (fd == -1)
return NULL;
fp = fdopen(fd, "r+");
if (fp == NULL) {
printf("DBG: %s(errno=%d)\n", __func__, errno);
ubi_vol_close(fd);
return NULL;
}
err = ubi_vol_update(fd, bytes);
if (err < 0) {
printf("DBG: %s() fd=%d err=%d\n", __func__, fd, err);
fclose(fp);
return NULL;
}
return fp;
}
int
ubi_vol_get_used_bytes(int vol_fd, unsigned long long *bytes)
{
off_t res;
res = lseek(vol_fd, 0, SEEK_END);
if (res == (off_t)-1)
return -1;
*bytes = (unsigned long long) res;
res = lseek(vol_fd, 0, SEEK_SET);
return res == (off_t)-1 ? -1 : 0;
}
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