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;
}
int default_read(uint64_t oid, struct siocb *iocb)
{
int ret;
char path[PATH_MAX];
uint32_t epoch = sys_epoch();
get_obj_path(oid, path);
ret = default_read_from_path(oid, path, iocb);
/* If the request is againt the older epoch, try to read from
* the stale directory */
while (ret == SD_RES_NO_OBJ && iocb->epoch < epoch) {
epoch--;
get_stale_obj_path(oid, epoch, path);
ret = default_read_from_path(oid, path, iocb);
}
return ret;
}
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_get_hash(uint64_t oid, uint32_t epoch, uint8_t *sha1)
{
int ret;
void *buf;
struct siocb iocb = {};
uint32_t length;
bool is_readonly_obj = oid_is_readonly(oid);
char path[PATH_MAX];
ret = get_object_path(oid, epoch, path, sizeof(path));
if (ret != SD_RES_SUCCESS)
return ret;
if (is_readonly_obj) {
if (get_object_sha1(path, sha1) == 0) {
sd_debug("use cached sha1 digest %s",
sha1_to_hex(sha1));
return SD_RES_SUCCESS;
}
}
length = get_store_objsize(oid);
buf = valloc(length);
if (buf == NULL)
return SD_RES_NO_MEM;
iocb.epoch = epoch;
iocb.buf = buf;
iocb.length = length;
ret = default_read_from_path(oid, path, &iocb);
if (ret != SD_RES_SUCCESS) {
free(buf);
return ret;
}
get_buffer_sha1(buf, length, sha1);
free(buf);
sd_debug("the message digest of %"PRIx64" at epoch %d is %s", oid,
epoch, sha1_to_hex(sha1));
if (is_readonly_obj)
set_object_sha1(path, sha1);
return ret;
}
