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 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 |
|
|
178 |
|
return(n); |
179 |
|
} |
180 |
|
/* sync the beams */ |
181 |
< |
for (j = all ? nbeams(hp) : 0; j > 0; j--) |
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? */ |
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 |
+ |
hdfilord(hb1, hb2) /* order beams for optimal loading */ |
352 |
+ |
register HDBEAMI *hb1, *hb2; |
353 |
+ |
{ |
354 |
+ |
register int c; |
355 |
+ |
/* sort by file descriptor first */ |
356 |
+ |
if ((c = hb1->h->fd - hb2->h->fd)) |
357 |
+ |
return(c); |
358 |
+ |
/* then by position in file */ |
359 |
+ |
return(hb1->h->bi[hb1->b].fo - hb2->h->bi[hb2->b].fo); |
360 |
+ |
} |
361 |
+ |
|
362 |
+ |
|
363 |
+ |
hdloadbeams(hb, n, bf) /* load a list of beams in optimal order */ |
364 |
+ |
register HDBEAMI *hb; /* list gets sorted by hdfilord() */ |
365 |
+ |
int n; /* list length */ |
366 |
+ |
int (*bf)(); /* callback function (optional) */ |
367 |
+ |
{ |
368 |
+ |
unsigned origcachesize, memuse; |
369 |
+ |
register BEAM *bp; |
370 |
+ |
int bytesloaded, needbytes, bytes2free; |
371 |
+ |
register int i; |
372 |
+ |
/* precheck consistency */ |
373 |
+ |
for (i = n; i--; ) |
374 |
+ |
if (hb[i].h == NULL || hb[i].b < 1 | hb[i].b > nbeams(hb[i].h)) |
375 |
+ |
error(CONSISTENCY, "bad beam in hdloadbeams"); |
376 |
+ |
/* sort list for optimal access */ |
377 |
+ |
qsort((char *)hb, n, sizeof(HDBEAMI), hdfilord); |
378 |
+ |
bytesloaded = needbytes = 0; /* figure out memory needs */ |
379 |
+ |
if ((origcachesize = hdcachesize) > 0) { |
380 |
+ |
for (i = n; i--; ) |
381 |
+ |
if ((bp = hb[i].h->bl[hb[i].b]) != NULL) { |
382 |
+ |
bp->tick = hdclock; /* preempt swap */ |
383 |
+ |
bytesloaded += bp->nrm; |
384 |
+ |
} else /* prepare to load */ |
385 |
+ |
needbytes += hb[i].h->bi[hb[i].b].nrd; |
386 |
+ |
bytesloaded *= sizeof(RAYVAL); |
387 |
+ |
needbytes *= sizeof(RAYVAL); |
388 |
+ |
do { /* free enough memory */ |
389 |
+ |
memuse = hdmemuse(0); |
390 |
+ |
bytes2free = needbytes - (signed)(hdcachesize-memuse); |
391 |
+ |
if (bytes2free > (signed)(memuse - bytesloaded)) |
392 |
+ |
bytes2free = memuse - bytesloaded; |
393 |
+ |
} while (bytes2free > 0 && |
394 |
+ |
hdfreecache(100*bytes2free/memuse, NULL) < 0); |
395 |
+ |
} |
396 |
+ |
hdcachesize = 0; /* load the ordered beams w/o swap */ |
397 |
+ |
for (i = 0; i < n; i++) |
398 |
+ |
if ((bp = hdgetbeam(hb[i].h, hb[i].b)) != NULL && bf != NULL) |
399 |
+ |
(*bf)(bp, hb[i].h, hb[i].b); |
400 |
+ |
hdcachesize = origcachesize; /* resume dynamic swapping */ |
401 |
+ |
} |
402 |
+ |
|
403 |
+ |
|
404 |
+ |
int |
405 |
|
hdsyncbeam(hp, i) /* sync beam in memory with beam on disk */ |
406 |
|
register HOLO *hp; |
407 |
|
register int i; |
410 |
|
long nfo; |
411 |
|
unsigned int n; |
412 |
|
/* check file status */ |
413 |
< |
if (hdfrag[hp->fd].writerr) |
413 |
> |
if (hdfragl[hp->fd].writerr) |
414 |
|
return(-1); |
415 |
|
#ifdef DEBUG |
416 |
|
if (i < 1 | i > nbeams(hp)) |
420 |
|
if (hp->bl[i] == NULL || (nrays = hp->bl[i]->nrm) == hp->bi[i].nrd) |
421 |
|
return(0); |
422 |
|
/* locate fragment */ |
423 |
< |
if (hp->fd >= nhdfrags || !hdfrag[hp->fd].nlinks) /* untracked */ |
423 |
> |
if (hp->fd >= nhdfragls || !hdfragl[hp->fd].nlinks) /* untracked */ |
424 |
|
hp->bi[i].fo = lseek(hp->fd, 0L, 2); |
425 |
|
|
426 |
|
else if (hp->bi[i].fo + hp->bi[i].nrd*sizeof(RAYVAL) == |
427 |
< |
hdfrag[hp->fd].flen) /* EOF special case */ |
428 |
< |
hdfrag[hp->fd].flen = (nfo=hp->bi[i].fo) + nrays*sizeof(RAYVAL); |
427 |
> |
hdfragl[hp->fd].flen) /* EOF special case */ |
428 |
> |
hdfragl[hp->fd].flen = (nfo=hp->bi[i].fo) + nrays*sizeof(RAYVAL); |
429 |
|
|
430 |
|
else { /* general case */ |
431 |
< |
register struct fragment *f = &hdfrag[hp->fd]; |
431 |
> |
register struct fraglist *f = &hdfragl[hp->fd]; |
432 |
|
register int j, k; |
433 |
< |
/* relinquish old fragment */ |
433 |
> |
n = f->nfrags; /* relinquish old fragment */ |
434 |
|
if (hp->bi[i].nrd) { |
435 |
|
j = f->nfrags++; |
436 |
< |
#ifdef MAXFRAG |
436 |
> |
#if MAXFRAG |
437 |
|
if (j >= MAXFRAG-1) |
438 |
|
f->nfrags--; |
439 |
|
#endif |
454 |
|
f->fi[j].nrd = hp->bi[i].nrd; |
455 |
|
break; |
456 |
|
} |
457 |
< |
copystruct(f->fi+j, f->fi+j-1); |
457 |
> |
copystruct(f->fi+j, f->fi+(j-1)); |
458 |
|
} |
459 |
|
/* coalesce adjacent fragments */ |
460 |
< |
for (j = k = 0; k < f->nfrags; j++, k++) { |
461 |
< |
if (k > j) |
462 |
< |
copystruct(f->fi+j, f->fi+k); |
463 |
< |
while (k+1 < f->nfrags && f->fi[k+1].fo + |
464 |
< |
f->fi[k+1].nrd*sizeof(RAYVAL) |
410 |
< |
== f->fi[j].fo) { |
411 |
< |
f->fi[j].fo -= |
412 |
< |
f->fi[++k].nrd*sizeof(RAYVAL); |
413 |
< |
f->fi[j].nrd += f->fi[k].nrd; |
414 |
< |
} |
460 |
> |
if (j && f->fi[j-1].fo == f->fi[j].fo + |
461 |
> |
f->fi[j].nrd*sizeof(RAYVAL)) { |
462 |
> |
f->fi[j].nrd += f->fi[j-1].nrd; |
463 |
> |
f->fi[j-1].nrd = 0; |
464 |
> |
n = j-1; |
465 |
|
} |
466 |
< |
f->nfrags = j; |
466 |
> |
if (j+1 < f->nfrags && f->fi[j].fo == f->fi[j+1].fo + |
467 |
> |
f->fi[j+1].nrd*sizeof(RAYVAL)) { |
468 |
> |
f->fi[j+1].nrd += f->fi[j].nrd; |
469 |
> |
f->fi[j].nrd = 0; |
470 |
> |
if (j < n) n = j; |
471 |
> |
} |
472 |
|
} |
473 |
|
k = -1; /* find closest-sized fragment */ |
474 |
< |
for (j = nrays ? f->nfrags : 0; j-- > 0; ) |
474 |
> |
for (j = (nrays ? f->nfrags : 0); j-- > 0; ) |
475 |
|
if (f->fi[j].nrd >= nrays && |
476 |
|
(k < 0 || f->fi[j].nrd < f->fi[k].nrd)) |
477 |
|
if (f->fi[k=j].nrd == nrays) |
481 |
|
f->flen += nrays*sizeof(RAYVAL); |
482 |
|
} else { /* else use fragment */ |
483 |
|
nfo = f->fi[k].fo; |
484 |
< |
if (f->fi[k].nrd == nrays) { /* delete fragment */ |
485 |
< |
f->nfrags--; |
486 |
< |
for (j = k; j < f->nfrags; j++) |
432 |
< |
copystruct(f->fi+j, f->fi+j+1); |
433 |
< |
} else { /* else shrink it */ |
434 |
< |
f->fi[k].fo += nrays*sizeof(RAYVAL); |
435 |
< |
f->fi[k].nrd -= nrays; |
436 |
< |
} |
484 |
> |
f->fi[k].fo += nrays*sizeof(RAYVAL); |
485 |
> |
if (!(f->fi[k].nrd -= nrays) && k < n) |
486 |
> |
n = k; |
487 |
|
} |
488 |
+ |
/* delete empty remnants */ |
489 |
+ |
for (j = k = n; k < f->nfrags; j++, k++) { |
490 |
+ |
while (f->fi[k].nrd == 0) |
491 |
+ |
if (++k >= f->nfrags) |
492 |
+ |
goto endloop; |
493 |
+ |
if (k > j) |
494 |
+ |
copystruct(f->fi+j, f->fi+k); |
495 |
+ |
} |
496 |
+ |
endloop: |
497 |
+ |
f->nfrags = j; |
498 |
|
} |
499 |
|
if (nrays) { /* write the new fragment */ |
500 |
|
errno = 0; |
502 |
|
error(SYSTEM, "cannot seek on holodeck file"); |
503 |
|
n = hp->bl[i]->nrm * sizeof(RAYVAL); |
504 |
|
if (write(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) { |
505 |
< |
hdfrag[hp->fd].writerr++; |
505 |
> |
hdfragl[hp->fd].writerr++; |
506 |
|
hdsync(hp, 0); /* sync directory */ |
507 |
|
error(SYSTEM, "write error in hdsyncbeam"); |
508 |
|
} |
528 |
|
nchanged += hdfreebeam(hdlist[i], 0); |
529 |
|
return(nchanged); |
530 |
|
} |
531 |
< |
if (hdfrag[hp->fd].writerr) /* check for file error */ |
531 |
> |
if (hdfragl[hp->fd].writerr) /* check for file error */ |
532 |
|
return(0); |
533 |
|
if (i == 0) { /* clear entire holodeck */ |
534 |
|
nchanged = 0; |
597 |
|
} |
598 |
|
|
599 |
|
|
600 |
< |
hdlrulist(ha, ba, n, hp) /* add beams from holodeck to LRU list */ |
601 |
< |
register HOLO *ha[]; /* section list (NULL terminated) */ |
602 |
< |
register int ba[]; /* beam index to go with section */ |
603 |
< |
int n; /* length of arrays minus 1 */ |
600 |
> |
int |
601 |
> |
hdlrulist(hb, nents, n, hp) /* add beams from holodeck to LRU list */ |
602 |
> |
register HDBEAMI *hb; /* beam list */ |
603 |
> |
int nents; /* current list length */ |
604 |
> |
int n; /* maximum list length */ |
605 |
|
register HOLO *hp; /* section we're adding from */ |
606 |
|
{ |
607 |
|
register int i, j; |
547 |
– |
int nents; |
548 |
– |
/* find last entry in LRU list */ |
549 |
– |
for (j = 0; ha[j] != NULL; j++) |
550 |
– |
; |
551 |
– |
nents = j; |
608 |
|
/* insert each beam from hp */ |
609 |
|
for (i = nbeams(hp); i > 0; i--) { |
610 |
|
if (hp->bl[i] == NULL) /* check if loaded */ |
611 |
|
continue; |
612 |
< |
if ((j = ++nents) > n) /* grow list if we can */ |
612 |
> |
#if 0 |
613 |
> |
if (hp->bl[i]->tick == hdclock) /* preempt swap? */ |
614 |
> |
continue; |
615 |
> |
#endif |
616 |
> |
if ((j = ++nents) >= n) /* grow list if we can */ |
617 |
|
nents--; |
618 |
|
for ( ; ; ) { /* bubble into place */ |
619 |
|
if (!--j || hp->bl[i]->tick >= |
620 |
< |
ha[j-1]->bl[ba[j-1]]->tick) { |
621 |
< |
ha[j] = hp; |
622 |
< |
ba[j] = i; |
620 |
> |
hb[j-1].h->bl[hb[j-1].b]->tick) { |
621 |
> |
hb[j].h = hp; |
622 |
> |
hb[j].b = i; |
623 |
|
break; |
624 |
|
} |
625 |
< |
ha[j] = ha[j-1]; |
566 |
< |
ba[j] = ba[j-1]; |
625 |
> |
copystruct(hb+j, hb+(j-1)); |
626 |
|
} |
627 |
|
} |
628 |
< |
ha[nents] = NULL; /* all done */ |
570 |
< |
ba[nents] = 0; |
628 |
> |
return(nents); /* return new list length */ |
629 |
|
} |
630 |
|
|
631 |
|
|
632 |
+ |
int |
633 |
|
hdfreecache(pct, honly) /* free up cache space, writing changes */ |
634 |
|
int pct; /* maximum percentage to free */ |
635 |
|
register HOLO *honly; /* NULL means check all */ |
636 |
|
{ |
637 |
< |
HOLO *hp[FREEBEAMS+1]; |
579 |
< |
int bn[FREEBEAMS+1]; |
637 |
> |
HDBEAMI hb[FREEBEAMS]; |
638 |
|
int freetarget; |
639 |
+ |
int n; |
640 |
|
register int i; |
641 |
|
/* compute free target */ |
642 |
|
freetarget = (honly != NULL) ? blglob(honly)->nrm : |
643 |
|
hdmemuse(0)/sizeof(RAYVAL) ; |
644 |
|
freetarget = freetarget*pct/100; |
645 |
+ |
if (freetarget <= 0) |
646 |
+ |
return(0); |
647 |
|
/* find least recently used */ |
648 |
< |
hp[0] = NULL; |
588 |
< |
bn[0] = 0; |
648 |
> |
n = 0; |
649 |
|
if (honly != NULL) |
650 |
< |
hdlrulist(hp, bn, FREEBEAMS, honly); |
650 |
> |
n = hdlrulist(hb, n, FREEBEAMS, honly); |
651 |
|
else |
652 |
|
for (i = 0; hdlist[i] != NULL; i++) |
653 |
< |
hdlrulist(hp, bn, FREEBEAMS, hdlist[i]); |
653 |
> |
n = hdlrulist(hb, n, FREEBEAMS, hdlist[i]); |
654 |
|
/* free LRU beams */ |
655 |
< |
for (i = 0; hp[i] != NULL; i++) { |
656 |
< |
hdfreebeam(hp[i], bn[i]); |
657 |
< |
if ((freetarget -= hp[i]->bi[bn[i]].nrd) <= 0) |
655 |
> |
for (i = 0; i < n; i++) { |
656 |
> |
hdfreebeam(hb[i].h, hb[i].b); |
657 |
> |
if ((freetarget -= hb[i].h->bi[hb[i].b].nrd) <= 0) |
658 |
|
break; |
659 |
|
} |
660 |
|
hdsync(honly, 0); /* synchronize directories as necessary */ |
661 |
+ |
return(-freetarget); /* return how far past goal we went */ |
662 |
|
} |
663 |
|
|
664 |
|
|