static int init_vdi_state(uint64_t oid, const char *wd, uint32_t epoch)
{
int ret;
struct sd_inode *inode = xzalloc(SD_INODE_HEADER_SIZE);
struct siocb iocb = {
.epoch = epoch,
.buf = inode,
.length = SD_INODE_HEADER_SIZE,
};
char path[PATH_MAX];
if (epoch == 0)
get_store_path(oid, iocb.ec_index, path);
else
get_store_stale_path(oid, iocb.epoch, iocb.ec_index, path);
ret = default_read_from_path(oid, path, &iocb);
if (ret != SD_RES_SUCCESS) {
sd_err("failed to read inode header %" PRIx64 " %" PRId32
"at %s", oid, epoch, path);
goto out;
}
atomic_set_bit(oid_to_vid(oid), sys->vdi_inuse);
out:
free(inode);
return ret;
}
static int get_object_path(uint64_t oid, uint32_t epoch, char *path,
size_t size)
{
if (default_exist(oid, 0)) {
snprintf(path, PATH_MAX, "%s/%016"PRIx64,
md_get_object_dir(oid), oid);
} else {
get_store_stale_path(oid, epoch, 0, path);
if (access(path, F_OK) < 0) {
if (errno == ENOENT)
return SD_RES_NO_OBJ;
return SD_RES_EIO;
}
}
return SD_RES_SUCCESS;
}
int default_read(uint64_t oid, const struct siocb *iocb)
{
int ret;
char path[PATH_MAX];
get_store_path(oid, iocb->ec_index, path);
ret = default_read_from_path(oid, path, iocb);
/*
* If the request is againt the older epoch, try to read from
* the stale directory
*/
if (ret == SD_RES_NO_OBJ && iocb->epoch > 0 &&
iocb->epoch < sys_epoch()) {
get_store_stale_path(oid, iocb->epoch, iocb->ec_index, path);
ret = default_read_from_path(oid, path, iocb);
}
return ret;
}
int default_link(uint64_t oid, uint32_t tgt_epoch)
{
char path[PATH_MAX], stale_path[PATH_MAX];
sd_debug("try link %"PRIx64" from snapshot with epoch %d", oid,
tgt_epoch);
snprintf(path, PATH_MAX, "%s/%016"PRIx64, md_get_object_dir(oid), oid);
get_store_stale_path(oid, tgt_epoch, 0, stale_path);
if (link(stale_path, path) < 0) {
/*
* Recovery thread and main thread might try to recover the
* same object and we might get EEXIST in such case.
*/
if (errno == EEXIST)
goto out;
sd_debug("failed to link from %s to %s, %m", stale_path, path);
return err_to_sderr(path, oid, errno);
}
out:
return SD_RES_SUCCESS;
}