u64 get_file_size(int fd)
{
struct stat buf;
int ret;
u64 reserve_len = 0;
s64 computed_size;
ret = fstat(fd, &buf);
if (ret)
return 0;
if (info.len < 0)
reserve_len = -info.len;
if (S_ISREG(buf.st_mode))
computed_size = buf.st_size - reserve_len;
else if (S_ISBLK(buf.st_mode))
computed_size = get_block_device_size(fd) - reserve_len;
else
computed_size = 0;
if (computed_size < 0) {
warn("Computed filesystem size less than 0");
computed_size = 0;
}
return computed_size;
}
int wipe_block_device(int fd)
{
uint64_t range[2];
int ret;
uint64_t len = get_block_device_size(fd);
range[0] = 0;
range[1] = len;
if (range[1] == 0)
return 0;
ret = ioctl(fd, BLKSECDISCARD, &range);
if (ret < 0) {
ALOGE("Something went wrong secure discarding block: %s\n", strerror(errno));
range[0] = 0;
range[1] = len;
ret = ioctl(fd, BLKDISCARD, &range);
if (ret < 0) {
ALOGE("Discard failed: %s\n", strerror(errno));
return -1;
} else {
ALOGE("Wipe via secure discard failed, used non-secure discard instead\n");
return 0;
}
}
return ret;
}
int flash_erase(int fd)
{
int64_t size;
size = get_block_device_size(fd);
D(DEBUG, "erase %"PRId64" data from %d\n", size, fd);
return wipe_block_device(fd, size);
}
int main(int argc, char *argv[])
{
int secure = 0;
char *devname;
int fd;
u64 len;
struct stat statbuf;
int ret;
if ((argc != 2) && (argc != 3)) {
usage();
}
if (argc == 3) {
if (!strcmp(argv[1], "-s")) {
secure = 1;
devname = argv[2];
} else {
usage();
}
} else {
devname = argv[1];
}
fd = open(devname, O_RDWR);
if (fd < 0) {
fprintf(stderr, "Cannot open device %s\n", devname);
exit(1);
}
if (fstat(fd, &statbuf) < 0) {
fprintf(stderr, "Cannot stat %s\n", devname);
exit(1);
}
if (!S_ISBLK(statbuf.st_mode)) {
fprintf(stderr, "%s is not a block device\n", devname);
exit(1);
}
len = get_block_device_size(fd);
if (! len) {
fprintf(stderr, "Cannot get size of block device %s\n", devname);
exit(1);
}
ret = wipe_block_device(fd, len, secure);
close(fd);
return ret;
}
static jlong com_android_server_PersistentDataBlockService_getBlockDeviceSize(JNIEnv *env, jclass, jstring jpath)
{
ScopedUtfChars path(env, jpath);
int fd = open(path.c_str(), O_RDONLY);
if (fd < 0)
return 0;
const uint64_t size = get_block_device_size(fd);
close(fd);
return size;
}
int get_device_info(int fd, struct device_info *info)
{
blkid_probe probe;
struct stat stat;
int ret;
*info = device_info_clueless;
ret = fstat(fd, &stat);
if (ret < 0) {
perror("fstat on target failed");
return -1;
}
if (S_ISREG(stat.st_mode)) {
/* there is nothing more to discover for an image file */
info->type = TYPE_FILE;
info->partition = 0;
info->size = stat.st_size;
return 0;
}
if (!S_ISBLK(stat.st_mode)) {
/* neither regular file nor block device? not usable */
info->type = TYPE_BAD;
return 0;
}
probe = blkid_new_probe();
if (!probe) {
return -1;
}
if (blkid_probe_set_device(probe, fd, 0, 0)) {
blkid_free_probe(probe);
return -1;
}
get_block_device_size(info, fd);
get_block_geometry(info, fd);
info->sector_size = blkid_probe_get_sectorsize(probe);
/* use udev information if available, fall back to blkid probing */
if (udev_fill_info(info, &stat))
blkid_fill_info(info, probe);
blkid_free_probe(probe);
return 0;
}
uint64_t get_file_size64(int fd)
{
struct stat64 buf;
int ret;
uint64_t computed_size;
ret = fstat64(fd, &buf);
if (ret)
return 0;
if (S_ISREG(buf.st_mode))
computed_size = buf.st_size;
else if (S_ISBLK(buf.st_mode))
computed_size = get_block_device_size(fd);
else
computed_size = 0;
return computed_size;
}
int get_device_info(int fd, struct device_info *info)
{
struct stat stat;
int ret;
*info = device_info_clueless;
ret = fstat(fd, &stat);
if (ret < 0) {
perror("fstat on target failed");
return -1;
}
if (S_ISREG(stat.st_mode)) {
/* there is nothing more to discover for an image file */
info->type = TYPE_FILE;
info->partition = 0;
info->size = stat.st_size;
return 0;
}
if (!S_ISBLK(stat.st_mode)) {
/* neither regular file nor block device? not usable */
info->type = TYPE_BAD;
return 0;
}
get_block_device_size(info, fd);
get_block_geometry(info, fd);
get_sector_size(info, fd);
/* use udev information if available */
udev_fill_info(info, &stat);
return 0;
}
int format_volume(const char* volume) {
Volume* v = volume_for_path(volume);
if (v == NULL) {
LOGE("unknown volume \"%s\"\n", volume);
return -1;
}
if (strcmp(v->fs_type, "ramdisk") == 0) {
// you can't format the ramdisk.
LOGE("can't format_volume \"%s\"", volume);
return -1;
}
if (strcmp(v->mount_point, volume) != 0) {
LOGE("can't give path \"%s\" to format_volume\n", volume);
return -1;
}
if (ensure_path_unmounted(volume) != 0) {
LOGE("format_volume failed to unmount \"%s\"\n", v->mount_point);
return -1;
}
if (strcmp(v->fs_type, "yaffs2") == 0 || strcmp(v->fs_type, "mtd") == 0) {
mtd_scan_partitions();
const MtdPartition* partition = mtd_find_partition_by_name(v->blk_device);
if (partition == NULL) {
LOGE("format_volume: no MTD partition \"%s\"\n", v->blk_device);
return -1;
}
MtdWriteContext *write = mtd_write_partition(partition);
if (write == NULL) {
LOGW("format_volume: can't open MTD \"%s\"\n", v->blk_device);
return -1;
} else if (mtd_erase_blocks(write, -1) == (off_t) -1) {
LOGW("format_volume: can't erase MTD \"%s\"\n", v->blk_device);
mtd_write_close(write);
return -1;
} else if (mtd_write_close(write)) {
LOGW("format_volume: can't close MTD \"%s\"\n", v->blk_device);
return -1;
}
return 0;
}
if (strcmp(v->fs_type, "ext4") == 0) {
if (fs_mgr_is_encryptable(v) &&
(v->length == 0) &&
(v->key_loc != NULL) &&
!strcmp(v->key_loc, KEY_IN_FOOTER)) {
if (get_block_device_size(v->blk_device, &v->length) == 0) {
v->length -= CRYPT_FOOTER_OFFSET;
}
}
int result = make_ext4fs(v->blk_device, v->length, volume, sehandle);
if (result != 0) {
LOGE("format_volume: make_extf4fs failed on %s\n", v->blk_device);
return -1;
}
return 0;
}
#ifdef USE_UBIFS
if (strcmp(v->fs_type, "ubifs") == 0) {
int ret;
LOGW("formating by ubiVolumeFormat");
ret = ubiVolumeFormat(v->blk_device);
if (ret != 0) {
LOGE("ubiVolumeFormat return error:%d", ret);
return -1;
}
return 0;
}
#endif
LOGE("format_volume: fs_type \"%s\" unsupported\n", v->fs_type);
return -1;
}