| 21 |
|
#ifndef PCTFREE |
| 22 |
|
#define PCTFREE 20 /* maximum fraction to free (%) */ |
| 23 |
|
#endif |
| 24 |
+ |
#ifndef MAXFRAG |
| 25 |
+ |
#define MAXFRAG 32767 /* maximum fragments/file to track (0==inf) */ |
| 26 |
+ |
#endif |
| 27 |
|
|
| 25 |
– |
/* define MAXFRAG if you want to limit fragment tracking memory */ |
| 26 |
– |
|
| 28 |
|
#ifndef BSD |
| 29 |
|
#define write writebuf /* safe i/o routines */ |
| 30 |
|
#define read readbuf |
| 31 |
|
#endif |
| 32 |
|
|
| 33 |
< |
#define FRAGBLK 64 /* number of fragments to allocate at a time */ |
| 33 |
> |
#define FRAGBLK 256 /* number of fragments to allocate at a time */ |
| 34 |
|
|
| 35 |
< |
int hdcachesize = CACHESIZE*1024*1024; /* target cache size (bytes) */ |
| 35 |
> |
unsigned hdcachesize = CACHESIZE*1024*1024; /* target cache size */ |
| 36 |
|
unsigned long hdclock; /* clock value */ |
| 37 |
|
|
| 38 |
|
HOLO *hdlist[HDMAX+1]; /* holodeck pointers (NULL term.) */ |
| 39 |
|
|
| 40 |
< |
static struct fragment { |
| 40 |
> |
static struct fraglist { |
| 41 |
|
short nlinks; /* number of holodeck sections using us */ |
| 42 |
< |
short nfrags; /* number of known fragments */ |
| 42 |
> |
short writerr; /* write error encountered */ |
| 43 |
> |
int nfrags; /* number of known fragments */ |
| 44 |
|
BEAMI *fi; /* fragments, descending file position */ |
| 45 |
|
long flen; /* last known file length */ |
| 46 |
< |
} *hdfrag; /* fragment lists, indexed by file descriptor */ |
| 46 |
> |
} *hdfragl; /* fragment lists, indexed by file descriptor */ |
| 47 |
|
|
| 48 |
< |
static int nhdfrags; /* size of hdfrag array */ |
| 48 |
> |
static int nhdfragls; /* size of hdfragl array */ |
| 49 |
|
|
| 50 |
|
|
| 51 |
|
hdattach(fd) /* start tracking file fragments for some section */ |
| 52 |
|
register int fd; |
| 53 |
|
{ |
| 54 |
< |
if (fd >= nhdfrags) { |
| 55 |
< |
if (nhdfrags) |
| 56 |
< |
hdfrag = (struct fragment *)realloc((char *)hdfrag, |
| 57 |
< |
(fd+1)*sizeof(struct fragment)); |
| 54 |
> |
if (fd >= nhdfragls) { |
| 55 |
> |
if (nhdfragls) |
| 56 |
> |
hdfragl = (struct fraglist *)realloc((char *)hdfragl, |
| 57 |
> |
(fd+1)*sizeof(struct fraglist)); |
| 58 |
|
else |
| 59 |
< |
hdfrag = (struct fragment *)malloc( |
| 60 |
< |
(fd+1)*sizeof(struct fragment)); |
| 61 |
< |
if (hdfrag == NULL) |
| 59 |
> |
hdfragl = (struct fraglist *)malloc( |
| 60 |
> |
(fd+1)*sizeof(struct fraglist)); |
| 61 |
> |
if (hdfragl == NULL) |
| 62 |
|
error(SYSTEM, "out of memory in hdattach"); |
| 63 |
< |
bzero((char *)(hdfrag+nhdfrags), |
| 64 |
< |
(fd+1-nhdfrags)*sizeof(struct fragment)); |
| 65 |
< |
nhdfrags = fd+1; |
| 63 |
> |
bzero((char *)(hdfragl+nhdfragls), |
| 64 |
> |
(fd+1-nhdfragls)*sizeof(struct fraglist)); |
| 65 |
> |
nhdfragls = fd+1; |
| 66 |
|
} |
| 67 |
< |
hdfrag[fd].nlinks++; |
| 68 |
< |
hdfrag[fd].flen = lseek(fd, 0L, 2); /* get file length */ |
| 67 |
> |
hdfragl[fd].nlinks++; |
| 68 |
> |
hdfragl[fd].flen = lseek(fd, 0L, 2); /* get file length */ |
| 69 |
|
} |
| 70 |
|
|
| 71 |
|
|
| 75 |
|
hdrelease(fd) /* stop tracking file fragments for some section */ |
| 76 |
|
register int fd; |
| 77 |
|
{ |
| 78 |
< |
if (fd < 0 | fd >= nhdfrags || !hdfrag[fd].nlinks) |
| 78 |
> |
if (fd < 0 | fd >= nhdfragls || !hdfragl[fd].nlinks) |
| 79 |
|
return; |
| 80 |
< |
if (!--hdfrag[fd].nlinks && hdfrag[fd].nfrags) { |
| 81 |
< |
free((char *)hdfrag[fd].fi); |
| 82 |
< |
hdfrag[fd].fi = NULL; |
| 83 |
< |
hdfrag[fd].nfrags = 0; |
| 80 |
> |
if (!--hdfragl[fd].nlinks && hdfragl[fd].nfrags) { |
| 81 |
> |
free((char *)hdfragl[fd].fi); |
| 82 |
> |
hdfragl[fd].fi = NULL; |
| 83 |
> |
hdfragl[fd].nfrags = 0; |
| 84 |
|
} |
| 85 |
|
} |
| 86 |
|
|
| 140 |
|
hp->fd = fd; |
| 141 |
|
hp->dirty = 0; |
| 142 |
|
biglob(hp)->fo = fpos + sizeof(HDGRID); |
| 143 |
< |
biglob(hp)->nrd = 0; /* count rays on disk */ |
| 144 |
< |
for (n = nbeams(hp); n > 0; n--) |
| 145 |
< |
biglob(hp)->nrd += hp->bi[n].nrd; |
| 143 |
> |
/* start tracking fragments */ |
| 144 |
> |
hdattach(fd); |
| 145 |
> |
/* check rays on disk */ |
| 146 |
> |
fpos = hdfilen(fd); |
| 147 |
> |
biglob(hp)->nrd = 0; |
| 148 |
> |
for (n = hproto == NULL ? nbeams(hp) : 0; n > 0; n--) |
| 149 |
> |
if (hp->bi[n].nrd) |
| 150 |
> |
if (hp->bi[n].fo + hp->bi[n].nrd > fpos) |
| 151 |
> |
hp->bi[n].nrd = 0; /* off end */ |
| 152 |
> |
else |
| 153 |
> |
biglob(hp)->nrd += hp->bi[n].nrd; |
| 154 |
|
/* add to holodeck list */ |
| 155 |
|
for (n = 0; n < HDMAX; n++) |
| 156 |
|
if (hdlist[n] == NULL) { |
| 157 |
|
hdlist[n] = hp; |
| 158 |
|
break; |
| 159 |
|
} |
| 150 |
– |
/* start tracking fragments (last) */ |
| 151 |
– |
hdattach(fd); |
| 160 |
|
/* all done */ |
| 161 |
|
return(hp); |
| 162 |
|
memerr: |
| 165 |
|
|
| 166 |
|
|
| 167 |
|
int |
| 168 |
< |
hdsync(hp) /* update directory on disk if necessary */ |
| 168 |
> |
hdsync(hp, all) /* update beams and directory on disk */ |
| 169 |
|
register HOLO *hp; |
| 170 |
+ |
int all; |
| 171 |
|
{ |
| 172 |
|
register int j, n; |
| 173 |
|
|
| 174 |
< |
if (hp == NULL) { /* do all */ |
| 174 |
> |
if (hp == NULL) { /* do all holodecks */ |
| 175 |
|
n = 0; |
| 176 |
|
for (j = 0; hdlist[j] != NULL; j++) |
| 177 |
< |
n += hdsync(hdlist[j]); |
| 177 |
> |
n += hdsync(hdlist[j], all); |
| 178 |
|
return(n); |
| 179 |
|
} |
| 180 |
< |
if (!hp->dirty) /* check first */ |
| 180 |
> |
/* sync the beams */ |
| 181 |
> |
for (j = (all ? nbeams(hp) : 0); j > 0; j--) |
| 182 |
> |
if (hp->bl[j] != NULL) |
| 183 |
> |
hdsyncbeam(hp, j); |
| 184 |
> |
if (!hp->dirty) /* directory clean? */ |
| 185 |
|
return(0); |
| 186 |
|
errno = 0; |
| 187 |
|
if (lseek(hp->fd, biglob(hp)->fo, 0) < 0) |
| 194 |
|
} |
| 195 |
|
|
| 196 |
|
|
| 197 |
< |
long |
| 197 |
> |
unsigned |
| 198 |
|
hdmemuse(all) /* return memory usage (in bytes) */ |
| 199 |
|
int all; /* include overhead (painful) */ |
| 200 |
|
{ |
| 213 |
|
} |
| 214 |
|
} |
| 215 |
|
if (all) |
| 216 |
< |
for (j = 0; j < nhdfrags; j++) { |
| 217 |
< |
total += sizeof(struct fragment); |
| 218 |
< |
if (hdfrag[j].nfrags) |
| 216 |
> |
for (j = 0; j < nhdfragls; j++) { |
| 217 |
> |
total += sizeof(struct fraglist); |
| 218 |
> |
if (hdfragl[j].nfrags) |
| 219 |
|
total += FRAGBLK*sizeof(BEAMI) * |
| 220 |
< |
((hdfrag[j].nfrags-1)/FRAGBLK + 1) ; |
| 220 |
> |
((hdfragl[j].nfrags-1)/FRAGBLK + 1) ; |
| 221 |
|
} |
| 222 |
|
return(total); |
| 223 |
|
} |
| 231 |
|
|
| 232 |
|
if (fd < 0) |
| 233 |
|
return(-1); |
| 234 |
< |
if (fd >= nhdfrags || !hdfrag[fd].nlinks) { |
| 234 |
> |
if (fd >= nhdfragls || !hdfragl[fd].nlinks) { |
| 235 |
|
if ((fpos = lseek(fd, 0L, 1)) < 0) |
| 236 |
|
return(-1); |
| 237 |
|
flen = lseek(fd, 0L, 2); |
| 238 |
|
lseek(fd, fpos, 0); |
| 239 |
|
return(flen); |
| 240 |
|
} |
| 241 |
< |
return(hdfrag[fd].flen); |
| 241 |
> |
return(hdfragl[fd].flen); |
| 242 |
|
} |
| 243 |
|
|
| 244 |
|
|
| 309 |
|
p = hdbray(hp->bl[i]) + hp->bl[i]->nrm; |
| 310 |
|
hp->bl[i]->nrm += nr; /* update in-core structure */ |
| 311 |
|
bzero((char *)p, nr*sizeof(RAYVAL)); |
| 312 |
< |
hp->bl[i]->tick = ++hdclock; /* update LRU clock */ |
| 313 |
< |
blglob(hp)->tick = hdclock; |
| 312 |
> |
hp->bl[i]->tick = hdclock; /* update LRU clock */ |
| 313 |
> |
blglob(hp)->tick = hdclock++; |
| 314 |
|
return(p); /* point to new rays */ |
| 315 |
|
memerr: |
| 316 |
|
error(SYSTEM, "out of memory in hdnewrays"); |
| 341 |
|
if (read(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) |
| 342 |
|
error(SYSTEM, "error reading beam from holodeck file"); |
| 343 |
|
} |
| 344 |
< |
hp->bl[i]->tick = ++hdclock; /* update LRU clock */ |
| 345 |
< |
blglob(hp)->tick = hdclock; |
| 344 |
> |
hp->bl[i]->tick = hdclock; /* update LRU clock */ |
| 345 |
> |
blglob(hp)->tick = hdclock++; |
| 346 |
|
return(hp->bl[i]); |
| 347 |
|
} |
| 348 |
|
|
| 349 |
|
|
| 350 |
|
int |
| 351 |
< |
hdgetbi(hp, i) /* allocate a file fragment */ |
| 351 |
> |
hdfilord(hb1, hb2) /* order beams for quick loading */ |
| 352 |
> |
register HDBEAMI *hb1, *hb2; |
| 353 |
> |
{ |
| 354 |
> |
register long c; |
| 355 |
> |
/* residents go first */ |
| 356 |
> |
if (hb2->h->bl[hb2->b] != NULL) |
| 357 |
> |
return(hb1->h->bl[hb1->b] == NULL); |
| 358 |
> |
if (hb1->h->bl[hb1->b] != NULL) |
| 359 |
> |
return(-1); |
| 360 |
> |
/* otherwise sort by file descriptor */ |
| 361 |
> |
if ((c = hb1->h->fd - hb2->h->fd)) |
| 362 |
> |
return(c); |
| 363 |
> |
/* then by position in file */ |
| 364 |
> |
c = hb1->h->bi[hb1->b].fo - hb2->h->bi[hb2->b].fo; |
| 365 |
> |
return(c > 0 ? 1 : c < 0 ? -1 : 0); |
| 366 |
> |
} |
| 367 |
> |
|
| 368 |
> |
|
| 369 |
> |
hdloadbeams(hb, n, bf) /* load a list of beams in optimal order */ |
| 370 |
> |
register HDBEAMI *hb; /* list gets sorted by hdfilord() */ |
| 371 |
> |
int n; /* list length */ |
| 372 |
> |
int (*bf)(); /* callback function (optional) */ |
| 373 |
> |
{ |
| 374 |
> |
unsigned origcachesize, memuse; |
| 375 |
> |
register BEAM *bp; |
| 376 |
> |
int bytesloaded, needbytes, bytes2free; |
| 377 |
> |
register int i; |
| 378 |
> |
/* precheck consistency */ |
| 379 |
> |
for (i = n; i--; ) |
| 380 |
> |
if (hb[i].h == NULL || hb[i].b < 1 | hb[i].b > nbeams(hb[i].h)) |
| 381 |
> |
error(CONSISTENCY, "bad beam in hdloadbeams"); |
| 382 |
> |
/* sort list for optimal access */ |
| 383 |
> |
qsort((char *)hb, n, sizeof(HDBEAMI), hdfilord); |
| 384 |
> |
bytesloaded = 0; /* run through loaded beams */ |
| 385 |
> |
for ( ; n && (bp = hb->h->bl[hb->b]) != NULL; n--, hb++) { |
| 386 |
> |
bp->tick = hdclock; /* preempt swap */ |
| 387 |
> |
bytesloaded += bp->nrm; |
| 388 |
> |
if (bf != NULL) |
| 389 |
> |
(*bf)(bp, hb->h, hb->b); |
| 390 |
> |
} |
| 391 |
> |
bytesloaded *= sizeof(RAYVAL); |
| 392 |
> |
if ((origcachesize = hdcachesize) > 0) { |
| 393 |
> |
needbytes = 0; /* figure out memory needs */ |
| 394 |
> |
for (i = n; i--; ) |
| 395 |
> |
needbytes += hb[i].h->bi[hb[i].b].nrd; |
| 396 |
> |
needbytes *= sizeof(RAYVAL); |
| 397 |
> |
do { /* free enough memory */ |
| 398 |
> |
memuse = hdmemuse(0); |
| 399 |
> |
bytes2free = needbytes - (int)(hdcachesize-memuse); |
| 400 |
> |
if (bytes2free > (int)(memuse - bytesloaded)) |
| 401 |
> |
bytes2free = memuse - bytesloaded; |
| 402 |
> |
} while (bytes2free > 0 && |
| 403 |
> |
hdfreecache(100*bytes2free/memuse, NULL) < 0); |
| 404 |
> |
hdcachesize = 0; /* load beams w/o swap */ |
| 405 |
> |
} |
| 406 |
> |
for (i = 0; i < n; i++) |
| 407 |
> |
if ((bp = hdgetbeam(hb[i].h, hb[i].b)) != NULL && bf != NULL) |
| 408 |
> |
(*bf)(bp, hb[i].h, hb[i].b); |
| 409 |
> |
hdcachesize = origcachesize; /* resume dynamic swapping */ |
| 410 |
> |
} |
| 411 |
> |
|
| 412 |
> |
|
| 413 |
> |
int |
| 414 |
> |
hdsyncbeam(hp, i) /* sync beam in memory with beam on disk */ |
| 415 |
|
register HOLO *hp; |
| 416 |
|
register int i; |
| 417 |
|
{ |
| 418 |
< |
int nrays = hp->bl[i]->nrm; |
| 419 |
< |
|
| 420 |
< |
if (hp->bi[i].nrd == nrays) /* current one will do? */ |
| 418 |
> |
unsigned int nrays; |
| 419 |
> |
long nfo; |
| 420 |
> |
unsigned int n; |
| 421 |
> |
/* check file status */ |
| 422 |
> |
if (hdfragl[hp->fd].writerr) |
| 423 |
> |
return(-1); |
| 424 |
> |
#ifdef DEBUG |
| 425 |
> |
if (i < 1 | i > nbeams(hp)) |
| 426 |
> |
error(CONSISTENCY, "bad beam index in hdsyncbeam"); |
| 427 |
> |
#endif |
| 428 |
> |
/* is current fragment OK? */ |
| 429 |
> |
if (hp->bl[i] == NULL || (nrays = hp->bl[i]->nrm) == hp->bi[i].nrd) |
| 430 |
|
return(0); |
| 431 |
< |
|
| 432 |
< |
if (hp->fd >= nhdfrags || !hdfrag[hp->fd].nlinks) /* untracked */ |
| 431 |
> |
/* locate fragment */ |
| 432 |
> |
if (hp->fd >= nhdfragls || !hdfragl[hp->fd].nlinks) /* untracked */ |
| 433 |
|
hp->bi[i].fo = lseek(hp->fd, 0L, 2); |
| 434 |
|
|
| 435 |
|
else if (hp->bi[i].fo + hp->bi[i].nrd*sizeof(RAYVAL) == |
| 436 |
< |
hdfrag[hp->fd].flen) /* EOF special case */ |
| 437 |
< |
hdfrag[hp->fd].flen = hp->bi[i].fo + nrays*sizeof(RAYVAL); |
| 436 |
> |
hdfragl[hp->fd].flen) /* EOF special case */ |
| 437 |
> |
hdfragl[hp->fd].flen = (nfo=hp->bi[i].fo) + nrays*sizeof(RAYVAL); |
| 438 |
|
|
| 439 |
|
else { /* general case */ |
| 440 |
< |
register struct fragment *f = &hdfrag[hp->fd]; |
| 440 |
> |
register struct fraglist *f = &hdfragl[hp->fd]; |
| 441 |
|
register int j, k; |
| 442 |
< |
/* relinquish old fragment */ |
| 442 |
> |
n = f->nfrags; /* relinquish old fragment */ |
| 443 |
|
if (hp->bi[i].nrd) { |
| 444 |
|
j = f->nfrags++; |
| 445 |
< |
#ifdef MAXFRAG |
| 445 |
> |
#if MAXFRAG |
| 446 |
|
if (j >= MAXFRAG-1) |
| 447 |
|
f->nfrags--; |
| 448 |
|
#endif |
| 455 |
|
(j+FRAGBLK)*sizeof(BEAMI)); |
| 456 |
|
if (f->fi == NULL) |
| 457 |
|
error(SYSTEM, |
| 458 |
< |
"out of memory in hdgetbi"); |
| 458 |
> |
"out of memory in hdsyncbeam"); |
| 459 |
|
} |
| 460 |
|
for ( ; ; j--) { /* insert in descending list */ |
| 461 |
|
if (!j || hp->bi[i].fo < f->fi[j-1].fo) { |
| 463 |
|
f->fi[j].nrd = hp->bi[i].nrd; |
| 464 |
|
break; |
| 465 |
|
} |
| 466 |
< |
copystruct(f->fi+j, f->fi+j-1); |
| 466 |
> |
copystruct(f->fi+j, f->fi+(j-1)); |
| 467 |
|
} |
| 468 |
|
/* coalesce adjacent fragments */ |
| 469 |
< |
for (j = k = 0; k < f->nfrags; j++, k++) { |
| 470 |
< |
if (k > j) |
| 471 |
< |
copystruct(f->fi+j, f->fi+k); |
| 472 |
< |
while (k+1 < f->nfrags && f->fi[k+1].fo + |
| 473 |
< |
f->fi[k+1].nrd*sizeof(RAYVAL) |
| 389 |
< |
== f->fi[j].fo) { |
| 390 |
< |
f->fi[j].fo -= |
| 391 |
< |
f->fi[++k].nrd*sizeof(RAYVAL); |
| 392 |
< |
f->fi[j].nrd += f->fi[k].nrd; |
| 393 |
< |
} |
| 469 |
> |
if (j && f->fi[j-1].fo == f->fi[j].fo + |
| 470 |
> |
f->fi[j].nrd*sizeof(RAYVAL)) { |
| 471 |
> |
f->fi[j].nrd += f->fi[j-1].nrd; |
| 472 |
> |
f->fi[j-1].nrd = 0; |
| 473 |
> |
n = j-1; |
| 474 |
|
} |
| 475 |
< |
f->nfrags = j; |
| 475 |
> |
if (j+1 < f->nfrags && f->fi[j].fo == f->fi[j+1].fo + |
| 476 |
> |
f->fi[j+1].nrd*sizeof(RAYVAL)) { |
| 477 |
> |
f->fi[j+1].nrd += f->fi[j].nrd; |
| 478 |
> |
f->fi[j].nrd = 0; |
| 479 |
> |
if (j < n) n = j; |
| 480 |
> |
} |
| 481 |
|
} |
| 482 |
|
k = -1; /* find closest-sized fragment */ |
| 483 |
< |
for (j = f->nfrags; j-- > 0; ) |
| 483 |
> |
for (j = (nrays ? f->nfrags : 0); j-- > 0; ) |
| 484 |
|
if (f->fi[j].nrd >= nrays && |
| 485 |
|
(k < 0 || f->fi[j].nrd < f->fi[k].nrd)) |
| 486 |
|
if (f->fi[k=j].nrd == nrays) |
| 487 |
|
break; |
| 488 |
|
if (k < 0) { /* no fragment -- extend file */ |
| 489 |
< |
hp->bi[i].fo = f->flen; |
| 489 |
> |
nfo = f->flen; |
| 490 |
|
f->flen += nrays*sizeof(RAYVAL); |
| 491 |
|
} else { /* else use fragment */ |
| 492 |
< |
hp->bi[i].fo = f->fi[k].fo; |
| 493 |
< |
if (f->fi[k].nrd == nrays) { /* delete fragment */ |
| 494 |
< |
f->nfrags--; |
| 495 |
< |
for (j = k; j < f->nfrags; j++) |
| 411 |
< |
copystruct(f->fi+j, f->fi+j+1); |
| 412 |
< |
} else { /* else shrink it */ |
| 413 |
< |
f->fi[k].fo += nrays*sizeof(RAYVAL); |
| 414 |
< |
f->fi[k].nrd -= nrays; |
| 415 |
< |
} |
| 492 |
> |
nfo = f->fi[k].fo; |
| 493 |
> |
f->fi[k].fo += nrays*sizeof(RAYVAL); |
| 494 |
> |
if (!(f->fi[k].nrd -= nrays) && k < n) |
| 495 |
> |
n = k; |
| 496 |
|
} |
| 497 |
+ |
/* delete empty remnants */ |
| 498 |
+ |
for (j = k = n; k < f->nfrags; j++, k++) { |
| 499 |
+ |
while (f->fi[k].nrd == 0) |
| 500 |
+ |
if (++k >= f->nfrags) |
| 501 |
+ |
goto endloop; |
| 502 |
+ |
if (k > j) |
| 503 |
+ |
copystruct(f->fi+j, f->fi+k); |
| 504 |
+ |
} |
| 505 |
+ |
endloop: |
| 506 |
+ |
f->nfrags = j; |
| 507 |
|
} |
| 508 |
+ |
if (nrays) { /* write the new fragment */ |
| 509 |
+ |
errno = 0; |
| 510 |
+ |
if (lseek(hp->fd, nfo, 0) < 0) |
| 511 |
+ |
error(SYSTEM, "cannot seek on holodeck file"); |
| 512 |
+ |
n = hp->bl[i]->nrm * sizeof(RAYVAL); |
| 513 |
+ |
if (write(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) { |
| 514 |
+ |
hdfragl[hp->fd].writerr++; |
| 515 |
+ |
hdsync(hp, 0); /* sync directory */ |
| 516 |
+ |
error(SYSTEM, "write error in hdsyncbeam"); |
| 517 |
+ |
} |
| 518 |
+ |
} |
| 519 |
|
biglob(hp)->nrd += nrays - hp->bi[i].nrd; |
| 520 |
|
hp->bi[i].nrd = nrays; |
| 521 |
+ |
hp->bi[i].fo = nfo; |
| 522 |
|
markdirty(hp); /* section directory now out of date */ |
| 523 |
|
return(1); |
| 524 |
|
} |
| 529 |
|
register HOLO *hp; |
| 530 |
|
register int i; |
| 531 |
|
{ |
| 532 |
< |
int nchanged, n; |
| 532 |
> |
int nchanged; |
| 533 |
|
|
| 534 |
|
if (hp == NULL) { /* clear all holodecks */ |
| 535 |
|
nchanged = 0; |
| 537 |
|
nchanged += hdfreebeam(hdlist[i], 0); |
| 538 |
|
return(nchanged); |
| 539 |
|
} |
| 540 |
< |
if (hp->fd < 0) /* check for recursive error */ |
| 541 |
< |
return(-1); |
| 540 |
> |
if (hdfragl[hp->fd].writerr) /* check for file error */ |
| 541 |
> |
return(0); |
| 542 |
|
if (i == 0) { /* clear entire holodeck */ |
| 543 |
|
nchanged = 0; |
| 544 |
|
for (i = nbeams(hp); i > 0; i--) |
| 546 |
|
nchanged += hdfreebeam(hp, i); |
| 547 |
|
return(nchanged); |
| 548 |
|
} |
| 549 |
+ |
#ifdef DEBUG |
| 550 |
|
if (i < 1 | i > nbeams(hp)) |
| 551 |
|
error(CONSISTENCY, "bad beam index to hdfreebeam"); |
| 552 |
+ |
#endif |
| 553 |
|
if (hp->bl[i] == NULL) |
| 554 |
|
return(0); |
| 555 |
|
/* check for additions */ |
| 556 |
|
nchanged = hp->bl[i]->nrm - hp->bi[i].nrd; |
| 557 |
< |
if (nchanged) { |
| 558 |
< |
hdgetbi(hp, i); /* allocate a file position */ |
| 455 |
< |
errno = 0; |
| 456 |
< |
if (lseek(hp->fd, hp->bi[i].fo, 0) < 0) |
| 457 |
< |
error(SYSTEM, "cannot seek on holodeck file"); |
| 458 |
< |
n = hp->bl[i]->nrm * sizeof(RAYVAL); |
| 459 |
< |
if (write(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) { |
| 460 |
< |
hp->fd = -1; /* avoid recursive error */ |
| 461 |
< |
error(SYSTEM, "write error in hdfreebeam"); |
| 462 |
< |
} |
| 463 |
< |
} |
| 557 |
> |
if (nchanged) |
| 558 |
> |
hdsyncbeam(hp, i); /* write new fragment */ |
| 559 |
|
blglob(hp)->nrm -= hp->bl[i]->nrm; |
| 560 |
|
free((char *)hp->bl[i]); /* free memory */ |
| 561 |
|
hp->bl[i] = NULL; |
| 569 |
|
register int i; |
| 570 |
|
{ |
| 571 |
|
static BEAM emptybeam; |
| 572 |
< |
int nchanged, n; |
| 572 |
> |
int nchanged; |
| 573 |
|
|
| 574 |
|
if (hp == NULL) { /* clobber all holodecks */ |
| 575 |
|
nchanged = 0; |
| 588 |
|
#endif |
| 589 |
|
return(nchanged); |
| 590 |
|
} |
| 591 |
+ |
#ifdef DEBUG |
| 592 |
|
if (i < 1 | i > nbeams(hp)) |
| 593 |
|
error(CONSISTENCY, "bad beam index to hdkillbeam"); |
| 594 |
+ |
#endif |
| 595 |
|
if (hp->bl[i] != NULL) { /* free memory */ |
| 596 |
|
blglob(hp)->nrm -= nchanged = hp->bl[i]->nrm; |
| 597 |
|
free((char *)hp->bl[i]); |
| 599 |
|
nchanged = hp->bi[i].nrd; |
| 600 |
|
if (hp->bi[i].nrd) { /* free file fragment */ |
| 601 |
|
hp->bl[i] = &emptybeam; |
| 602 |
< |
hdgetbi(hp, i); |
| 602 |
> |
hdsyncbeam(hp, i); |
| 603 |
|
} |
| 604 |
|
hp->bl[i] = NULL; |
| 605 |
|
return(nchanged); |
| 606 |
|
} |
| 607 |
|
|
| 608 |
|
|
| 609 |
< |
hdlrulist(ha, ba, n, hp) /* add beams from holodeck to LRU list */ |
| 610 |
< |
register HOLO *ha[]; /* section list (NULL terminated) */ |
| 611 |
< |
register int ba[]; /* beam index to go with section */ |
| 612 |
< |
int n; /* length of arrays minus 1 */ |
| 609 |
> |
int |
| 610 |
> |
hdlrulist(hb, nents, n, hp) /* add beams from holodeck to LRU list */ |
| 611 |
> |
register HDBEAMI *hb; /* beam list */ |
| 612 |
> |
int nents; /* current list length */ |
| 613 |
> |
int n; /* maximum list length */ |
| 614 |
|
register HOLO *hp; /* section we're adding from */ |
| 615 |
|
{ |
| 616 |
|
register int i, j; |
| 519 |
– |
int nents; |
| 520 |
– |
/* find last entry in LRU list */ |
| 521 |
– |
for (j = 0; ha[j] != NULL; j++) |
| 522 |
– |
; |
| 523 |
– |
nents = j; |
| 617 |
|
/* insert each beam from hp */ |
| 618 |
|
for (i = nbeams(hp); i > 0; i--) { |
| 619 |
|
if (hp->bl[i] == NULL) /* check if loaded */ |
| 620 |
|
continue; |
| 621 |
< |
if ((j = ++nents) > n) /* grow list if we can */ |
| 621 |
> |
#if 0 |
| 622 |
> |
if (hp->bl[i]->tick == hdclock) /* preempt swap? */ |
| 623 |
> |
continue; |
| 624 |
> |
#endif |
| 625 |
> |
if ((j = ++nents) >= n) /* grow list if we can */ |
| 626 |
|
nents--; |
| 627 |
|
for ( ; ; ) { /* bubble into place */ |
| 628 |
|
if (!--j || hp->bl[i]->tick >= |
| 629 |
< |
ha[j-1]->bl[ba[j-1]]->tick) { |
| 630 |
< |
ha[j] = hp; |
| 631 |
< |
ba[j] = i; |
| 629 |
> |
hb[j-1].h->bl[hb[j-1].b]->tick) { |
| 630 |
> |
hb[j].h = hp; |
| 631 |
> |
hb[j].b = i; |
| 632 |
|
break; |
| 633 |
|
} |
| 634 |
< |
ha[j] = ha[j-1]; |
| 538 |
< |
ba[j] = ba[j-1]; |
| 634 |
> |
copystruct(hb+j, hb+(j-1)); |
| 635 |
|
} |
| 636 |
|
} |
| 637 |
< |
ha[nents] = NULL; /* all done */ |
| 542 |
< |
ba[nents] = 0; |
| 637 |
> |
return(nents); /* return new list length */ |
| 638 |
|
} |
| 639 |
|
|
| 640 |
|
|
| 641 |
+ |
int |
| 642 |
|
hdfreecache(pct, honly) /* free up cache space, writing changes */ |
| 643 |
|
int pct; /* maximum percentage to free */ |
| 644 |
|
register HOLO *honly; /* NULL means check all */ |
| 645 |
|
{ |
| 646 |
< |
HOLO *hp[FREEBEAMS+1]; |
| 551 |
< |
int bn[FREEBEAMS+1]; |
| 646 |
> |
HDBEAMI hb[FREEBEAMS]; |
| 647 |
|
int freetarget; |
| 648 |
+ |
int n; |
| 649 |
|
register int i; |
| 650 |
|
/* compute free target */ |
| 651 |
|
freetarget = (honly != NULL) ? blglob(honly)->nrm : |
| 652 |
|
hdmemuse(0)/sizeof(RAYVAL) ; |
| 653 |
|
freetarget = freetarget*pct/100; |
| 654 |
+ |
if (freetarget <= 0) |
| 655 |
+ |
return(0); |
| 656 |
|
/* find least recently used */ |
| 657 |
< |
hp[0] = NULL; |
| 560 |
< |
bn[0] = 0; |
| 657 |
> |
n = 0; |
| 658 |
|
if (honly != NULL) |
| 659 |
< |
hdlrulist(hp, bn, FREEBEAMS, honly); |
| 659 |
> |
n = hdlrulist(hb, n, FREEBEAMS, honly); |
| 660 |
|
else |
| 661 |
|
for (i = 0; hdlist[i] != NULL; i++) |
| 662 |
< |
hdlrulist(hp, bn, FREEBEAMS, hdlist[i]); |
| 662 |
> |
n = hdlrulist(hb, n, FREEBEAMS, hdlist[i]); |
| 663 |
|
/* free LRU beams */ |
| 664 |
< |
for (i = 0; hp[i] != NULL; i++) { |
| 665 |
< |
hdfreebeam(hp[i], bn[i]); |
| 666 |
< |
if ((freetarget -= hp[i]->bi[bn[i]].nrd) <= 0) |
| 664 |
> |
for (i = 0; i < n; i++) { |
| 665 |
> |
hdfreebeam(hb[i].h, hb[i].b); |
| 666 |
> |
if ((freetarget -= hb[i].h->bi[hb[i].b].nrd) <= 0) |
| 667 |
|
break; |
| 668 |
|
} |
| 669 |
< |
hdsync(honly); /* synchronize directories as necessary */ |
| 669 |
> |
hdsync(honly, 0); /* synchronize directories as necessary */ |
| 670 |
> |
return(-freetarget); /* return how far past goal we went */ |
| 671 |
|
} |
| 672 |
|
|
| 673 |
|
|
