Exemplo n.º 1
0
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;
}
Exemplo n.º 2
0
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;
}
Exemplo n.º 3
0
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;
}
Exemplo n.º 4
0
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;
}