ServerBlock* DiskBackedBlockMap::get_block_for_updating(const BlockId& block_id){
/** If block is not in block map, allocate space for it
* Otherwise, if the block is in memory, read and return
* if it is only on disk, read it in, store in block map and return.
* set in_memory and dirty_flag
*/
ServerBlock* block = block_map_.block(block_id);
size_t block_size = sip_tables_.block_size(block_id);
if (block == NULL) {
std::stringstream msg;
msg << "S " << sip_mpi_attr_.global_rank();
msg << " : getting uninitialized block " << block_id << ". Creating zero block for updating "<< std::endl;
SIP_LOG(std::cout << msg.str() << std::flush);
block = allocate_block(NULL, block_size);
block_map_.insert_block(block_id, block);
} else {
if(!block->is_in_memory()){
if (block->is_on_disk()){
read_block_from_disk(block, block_id, block_size);
} else {
block->allocate_in_memory_data();
}
}
}
block->set_in_memory();
block->set_dirty();
policy_.touch(block_id);
return block;
}
ServerBlock* DiskBackedBlockMap::get_block_for_reading(const BlockId& block_id){
/** If block is not in block map, there is an error !!
* Otherwise, if the block is in memory, read and return or
* if it is only on disk, read it in, store in block map and return.
* Set in_memory flag.
*/
ServerBlock* block = block_map_.block(block_id);
size_t block_size = sip_tables_.block_size(block_id);
if (block == NULL) {
// Error !
std::stringstream errmsg;
errmsg << " S " << sip_mpi_attr_.global_rank();
errmsg << " : Asking for block " << block_id << ". It has not been put/prepared before !"<< std::endl;
std::cout << errmsg.str() << std::flush;
sip::fail(errmsg.str());
// WARNING DISABLED !
if (false){
std::stringstream msg;
msg << "S " << sip_mpi_attr_.global_rank();
msg << " : getting uninitialized block " << block_id << ". Creating zero block "<< std::endl;
std::cout << msg.str() << std::flush;
block = allocate_block(NULL, block_size);
block_map_.insert_block(block_id, block);
}
} else {
if(!block->is_in_memory())
if (block->is_on_disk()){
read_block_from_disk(block, block_id, block_size);
} else {
sip::fail("get_block_for_reading : ServerBlock neither on memory or on disk !");
}
}
block->set_in_memory();
policy_.touch(block_id);
sip::check(block != NULL, "Block is NULL in Server get_block_for_reading, should not happen !");
return block;
}
struct cache_block* cache_block_get (block_sector_t sector, bool dirty)
{
lock_acquire (&cache_lock);
struct cache_block *c = block_in_cache (sector);
if (c)
{
c->open_cnt ++;
c->dirty |= dirty;
c->accessed = true;
lock_release (&cache_lock);
return c;
}
if (cache_size < CACHE_AMOUNT)
{
c = read_block_from_disk (sector, dirty);
lock_release (&cache_lock);
return c;
}else{
c = cache_block_evict (sector, dirty);
}
lock_release (&cache_lock);
return c;
}