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/*
* Copyright (C) 2014 Daniel Golle <daniel@makrotopia.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation
*
* 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.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include "libfstools.h"
#include "volume.h"
/* fit for UBI_MAX_VOLUME_NAME and sysfs path lengths */
#define BUFLEN 128
/* could use libubi-tiny instead, but already had the code directly reading
* from sysfs */
const char *const ubi_dir_name = "/sys/devices/virtual/ubi";
struct ubi_volume {
struct volume v;
int ubi_num;
int ubi_volid;
};
static struct driver ubi_driver;
static int
read_uint_from_file(char *dirname, char *filename, unsigned int *i)
{
FILE *f;
char fname[BUFLEN];
int ret = -1;
snprintf(fname, sizeof(fname), "%s/%s", dirname, filename);
f = fopen(fname, "r");
if (!f)
return ret;
if (fscanf(f, "%u", i) == 1)
ret = 0;
fclose(f);
return ret;
}
static char
*read_string_from_file(char *dirname, char *filename)
{
FILE *f;
char fname[BUFLEN];
char buf[BUFLEN];
int i;
snprintf(fname, sizeof(fname), "%s/%s", dirname, filename);
f = fopen(fname, "r");
if (!f)
return NULL;
if (fgets(buf, sizeof(buf), f) == NULL)
return NULL;
fclose(f);
/* make sure the string is \0 terminated */
buf[sizeof(buf) - 1] = '\0';
/* remove trailing whitespace */
i = strlen(buf) - 1;
while (i > 0 && buf[i] <= ' ')
buf[i--] = '\0';
return strdup(buf);
}
static unsigned int
test_open(char *filename)
{
FILE *f;
f = fopen(filename, "r");
if (!f)
return 0;
fclose(f);
return 1;
}
static int ubi_volume_init(struct volume *v)
{
struct ubi_volume *p = container_of(v, struct ubi_volume, v);
char voldir[BUFLEN], voldev[BUFLEN], *volname;
unsigned int volsize;
snprintf(voldir, sizeof(voldir), "%s/ubi%u/ubi%u_%u",
ubi_dir_name, p->ubi_num, p->ubi_num, p->ubi_volid);
snprintf(voldev, sizeof(voldev), "/dev/ubi%u_%u",
p->ubi_num, p->ubi_volid);
volname = read_string_from_file(voldir, "name");
if (!volname)
return -1;
if (read_uint_from_file(voldir, "data_bytes", &volsize))
return -1;
v->name = volname;
v->type = UBIVOLUME;
v->size = volsize;
v->blk = strdup(voldev);
return 0;
}
static struct volume *ubi_volume_match(char *name, int ubi_num, int volid)
{
char voldir[BUFLEN], volblkdev[BUFLEN], *volname;
struct ubi_volume *p;
snprintf(voldir, sizeof(voldir), "%s/ubi%u/ubi%u_%u",
ubi_dir_name, ubi_num, ubi_num, volid);
snprintf(volblkdev, sizeof(volblkdev), "/dev/ubiblock%u_%u",
ubi_num, volid);
/* skip if ubiblock device exists */
if (test_open(volblkdev))
return NULL;
/* todo: skip existing gluebi device for legacy support */
volname = read_string_from_file(voldir, "name");
if (!volname) {
ULOG_ERR("Couldn't read %s/name\n", voldir);
return NULL;
}
if (strncmp(name, volname, strlen(volname) + 1))
return NULL;
p = calloc(1, sizeof(struct ubi_volume));
if (!p)
return NULL;
p->v.drv = &ubi_driver;
p->ubi_num = ubi_num;
p->ubi_volid = volid;
return &p->v;
}
static struct volume *ubi_part_match(char *name, unsigned int ubi_num)
{
DIR *ubi_dir;
struct dirent *ubi_dirent;
unsigned int volid;
char devdir[BUFLEN];
struct volume *ret = NULL;
snprintf(devdir, sizeof(devdir), "%s/ubi%u",
ubi_dir_name, ubi_num);
ubi_dir = opendir(devdir);
if (!ubi_dir)
return ret;
while ((ubi_dirent = readdir(ubi_dir)) != NULL) {
if (strncmp(ubi_dirent->d_name, "ubi", 3))
continue;
if (sscanf(ubi_dirent->d_name, "ubi%*u_%u", &volid) != 1)
continue;
ret = ubi_volume_match(name, ubi_num, volid);
if (ret)
break;
}
closedir(ubi_dir);
return ret;
}
static struct volume *ubi_volume_find(char *name)
{
struct volume *ret = NULL;
DIR *ubi_dir;
struct dirent *ubi_dirent;
unsigned int ubi_num;
if (find_filesystem("ubifs"))
return ret;
ubi_dir = opendir(ubi_dir_name);
/* check for os ubi support */
if (!ubi_dir)
return ret;
/* probe ubi devices and volumes */
while ((ubi_dirent = readdir(ubi_dir)) != NULL) {
if (ubi_dirent->d_name[0] == '.')
continue;
sscanf(ubi_dirent->d_name, "ubi%u", &ubi_num);
ret = ubi_part_match(name, ubi_num);
if (ret)
break;
}
closedir(ubi_dir);
return ret;
}
static int ubi_volume_identify(struct volume *v)
{
/* Todo: use libblkid-tiny on the ubi chardev */
return FS_UBIFS;
}
static struct driver ubi_driver = {
.name = "ubi",
.find = ubi_volume_find,
.init = ubi_volume_init,
.identify = ubi_volume_identify,
};
DRIVER(ubi_driver);
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