1999/0806/mpc/devsac.c (diff list | history)

1999/0727/sys/src/9/mpc/devsac.c:17,22 – 1999/0806/sys/src/9/mpc/devsac.c:17,23 (short | long | prev | next)
1999/0608		{ OPERM = 0x3, /* mask of all permission types in open mode */ Nram = 512,
1999/0806		CacheSize = 20,
1999/0608		}; typedef struct SacPath SacPath;
1999/0727/sys/src/9/mpc/devsac.c:23,28 – 1999/0806/sys/src/9/mpc/devsac.c:24,30
1999/0608		typedef struct Sac Sac; typedef struct SacHeader SacHeader; typedef struct SacDir SacDir;
1999/0806		typedef struct Cache Cache;
1999/0608		enum { Magic = 0x5acf5,
1999/0727/sys/src/9/mpc/devsac.c:64,69 – 1999/0806/sys/src/9/mpc/devsac.c:66,78
1999/0608		int entry; };
1999/0806		struct Cache { long block; ulong age; uchar *data; };
1999/0608		enum { Pexec = 1,
1999/0727/sys/src/9/mpc/devsac.c:77,82 – 1999/0806/sys/src/9/mpc/devsac.c:86,93
1999/0609		static uchar *data = SACMEM; static int blocksize; static Sac root;
1999/0806		static Cache cache[CacheSize]; static ulong cacheage;
1999/0608
1999/0609		static void sacdir(Chan *, SacDir*, char*); static ulong getl(void *p);
1999/0727/sys/src/9/mpc/devsac.c:91,96 – 1999/0806/sys/src/9/mpc/devsac.c:102,110
1999/0609		sacinit(void)
1999/0608		{ SacHeader *hdr;
1999/0806		uchar *p; int i;
1999/0609		print("sacinit\n");
1999/0608		hdr = (SacHeader*)data; if(getl(hdr->magic) != Magic) {
1999/0727/sys/src/9/mpc/devsac.c:99,104 – 1999/0806/sys/src/9/mpc/devsac.c:113,125
1999/0608		} blocksize = getl(hdr->blocksize); root.SacDir = *(SacDir*)(data + sizeof(SacHeader));
1999/0806		p = malloc(CacheSize*blocksize); if(p == nil) error("allocating cache"); for(i=0; i<CacheSize; i++) { cache[i].data = p; p += blocksize; }
1999/0608		} static Chan*
1999/0727/sys/src/9/mpc/devsac.c:310,319 – 1999/0806/sys/src/9/mpc/devsac.c:331,362
1999/0608		loadblock(void *buf, uchar *offset, int blocksize) { vlong block, n;
1999/0806		ulong age; int i, j;
1999/0608		block = getv(offset); if(block < 0) { block = -block;
1999/0806		cacheage++; // age has wraped if(cacheage == 0) { for(i=0; i<CacheSize; i++) cache[i].age = 0; } j = 0; age = cache[0].age; for(i=0; i<CacheSize; i++) { if(cache[i].age < age) { age = cache[i].age; j = i; } if(cache[i].block != block) continue; memmove(buf, cache[i].data, blocksize); cache[i].age = cacheage; return; }
1999/0608		n = getv(offset+8); if(n < 0) n = -n;
1999/0727/sys/src/9/mpc/devsac.c:320,325 – 1999/0806/sys/src/9/mpc/devsac.c:363,371
1999/0608		n -= block; if(unsac(buf, data+block, blocksize, n)<0) panic("unsac failed!");
1999/0806		memmove(cache[j].data, buf, blocksize); cache[j].age = cacheage; cache[j].block = block;
1999/0608		} else { memmove(buf, data+block, blocksize); }