static int jffs2_reset(struct volume *v, int reset)
{
char *mp;
mp = find_mount_point(v->blk, 1);
if (mp) {
ULOG_INFO("%s is mounted as %s, only erasing files\n", v->blk, mp);
fs_state_set("/overlay", FS_STATE_PENDING);
overlay_delete(mp, false);
mount(mp, "/", NULL, MS_REMOUNT, 0);
} else {
ULOG_INFO("%s is not mounted\n", v->blk);
return jffs2_mark(v);
}
if (reset) {
sync();
sleep(2);
reboot(RB_AUTOBOOT);
while (1)
;
}
return 0;
}
int
sentinel_write(struct volume *v, uint32_t _seq)
{
int ret, block;
struct stat s;
uint32_t seq;
if (stat("/tmp/config.tar.gz", &s)) {
ULOG_ERR("failed to stat /tmp/config.tar.gz\n");
return -1;
}
snapshot_next_free(v, &seq);
if (_seq)
seq = _seq;
block = v->size / v->block_size;
block -= pad_file_size(v, s.st_size) / v->block_size;
if (block < 0)
block = 0;
ret = snapshot_write_file(v, block, "/tmp/config.tar.gz", seq, CONF);
if (ret)
ULOG_ERR("failed to write sentinel\n");
else
ULOG_INFO("wrote /tmp/config.tar.gz sentinel\n");
return ret;
}
static int
snapshot_sync(struct volume *v)
{
struct file_header sentinel, conf;
int next, block = 0;
uint32_t seq;
next = snapshot_next_free(v, &seq);
block = config_find(v, &conf, &sentinel);
if (is_config(&conf) && conf.seq != seq) {
conf.magic = 0;
volume_erase(v, next * v->block_size, 2 * v->block_size);
}
if (is_config(&sentinel) && (sentinel.seq != seq)) {
sentinel.magic = 0;
volume_erase(v, block * v->block_size, v->block_size);
}
if (!is_config(&conf) && !is_config(&sentinel)) {
// ULOG_ERR("no config found\n");
} else if (((is_config(&conf) && is_config(&sentinel)) &&
(memcmp(conf.md5, sentinel.md5, sizeof(conf.md5)) || (conf.seq != sentinel.seq))) ||
(is_config(&conf) && !is_config(&sentinel))) {
uint32_t seq;
int next = snapshot_next_free(v, &seq);
int ret = snapshot_read_file(v, next, "/tmp/config.tar.gz", CONF);
if (ret > 0) {
if (sentinel_write(v, conf.seq))
ULOG_ERR("failed to write sentinel data");
}
} else if (!is_config(&conf) && is_config(&sentinel) && next) {
int ret = snapshot_read_file(v, block, "/tmp/config.tar.gz", CONF);
if (ret > 0)
if (volatile_write(v, sentinel.seq))
ULOG_ERR("failed to write sentinel data");
} else
ULOG_INFO("config in sync\n");
unlink("/tmp/config.tar.gz");
return 0;
}
int
volatile_write(struct volume *v, uint32_t _seq)
{
int block, ret;
uint32_t seq;
block = snapshot_next_free(v, &seq);
if (_seq)
seq = _seq;
if (block < 0)
block = 0;
ret = snapshot_write_file(v, block, "/tmp/config.tar.gz", seq, CONF);
if (ret)
ULOG_ERR("failed to write /tmp/config.tar.gz\n");
else
ULOG_INFO("wrote /tmp/config.tar.gz\n");
return ret;
}
static int jffs2_mark(struct volume *v)
{
__u32 deadc0de = __cpu_to_be32(0xdeadc0de);
size_t sz;
int fd;
fd = open(v->blk, O_WRONLY);
ULOG_INFO("%s will be erased on next mount\n", v->blk);
if (!fd) {
ULOG_ERR("opening %s failed\n", v->blk);
return -1;
}
sz = write(fd, &deadc0de, sizeof(deadc0de));
close(fd);
if (sz != 4) {
ULOG_ERR("writing %s failed: %s\n", v->blk, strerror(errno));
return -1;
}
return 0;
}