//---------------------------------------------------------------------------
int scache_readSector(cache_set* cache, unsigned int sector, void** buf) {
int index; //index is given in single sectors not octal sectors
int ret;
unsigned int alignedSector;
XPRINTF("cache: readSector devId = %i %p sector = %u \n", cache->dev->devId, cache, sector);
if (cache == NULL) {
printf("cache: devId cache not created = %i \n", cache->dev->devId);
return -1;
}
#ifdef SCACHE_RECORD_STATS
cache->cacheAccess ++;
#endif
index = getIndexRead(cache, sector);
XPRINTF("cache: indexRead=%i \n", index);
if (index >= 0) { //sector found in cache
#ifdef SCACHE_RECORD_STATS
cache->cacheHits ++;
#endif
*buf = cache->sectorBuf + (index * cache->sectorSize);
XPRINTF("cache: hit and done reading sector \n");
return cache->sectorSize;
}
//compute alignedSector - to prevent storage of duplicit sectors in slots
alignedSector = (sector/cache->indexLimit)*cache->indexLimit;
index = getIndexWrite(cache, alignedSector);
XPRINTF("cache: indexWrite=%i slot=%d alignedSector=%u\n", index, index / cache->indexLimit, alignedSector);
ret = READ_SECTOR(cache->dev, alignedSector, cache->sectorBuf + (index * cache->sectorSize), BLOCK_SIZE/cache->sectorSize);
if (ret < 0) {
printf("scache: ERROR reading sector from disk! sector=%u\n", alignedSector);
return ret;
}
*buf = cache->sectorBuf + (index * cache->sectorSize) + ((sector%cache->indexLimit) * cache->sectorSize);
XPRINTF("cache: done reading physical sector \n");
//write precaution
//cache->flushCounter++;
//if (cache->flushCounter == FLUSH_TRIGGER) {
//scache_flushSectors(cache);
//}
return cache->sectorSize;
}
//---------------------------------------------------------------------------
int scache_allocSector(cache_set* cache, unsigned int sector, void** buf) {
int index; //index is given in single sectors not octal sectors
//int ret;
unsigned int alignedSector;
XPRINTF("cache: allocSector devId = %i sector = %i \n", cache->dev->devId, sector);
index = getIndexRead(cache, sector);
XPRINTF("cache: indexRead=%i \n", index);
if (index >= 0) { //sector found in cache
*buf = cache->sectorBuf + (index * cache->sectorSize);
XPRINTF("cache: hit and done allocating sector \n");
return cache->sectorSize;
}
//compute alignedSector - to prevent storage of duplicit sectors in slots
alignedSector = (sector/cache->indexLimit)*cache->indexLimit;
index = getIndexWrite(cache, alignedSector);
XPRINTF("cache: indexWrite=%i \n", index);
*buf = cache->sectorBuf + (index * cache->sectorSize) + ((sector%cache->indexLimit) * cache->sectorSize);
XPRINTF("cache: done allocating sector\n");
return cache->sectorSize;
}
