22 |
|
#define PCTFREE 20 /* maximum fraction to free (%) */ |
23 |
|
#endif |
24 |
|
|
25 |
+ |
/* define MAXFRAG if you want to limit fragment tracking memory */ |
26 |
+ |
|
27 |
|
#ifndef BSD |
28 |
|
#define write writebuf /* safe i/o routines */ |
29 |
|
#define read readbuf |
30 |
|
#endif |
31 |
|
|
30 |
– |
#define MAXFRAG (128*FRAGBLK) /* maximum fragments per file */ |
31 |
– |
|
32 |
|
#define FRAGBLK 64 /* number of fragments to allocate at a time */ |
33 |
|
|
34 |
|
int hdcachesize = CACHESIZE*1024*1024; /* target cache size (bytes) */ |
73 |
|
hdrelease(fd) /* stop tracking file fragments for some section */ |
74 |
|
register int fd; |
75 |
|
{ |
76 |
< |
if (fd >= nhdfrags || !hdfrag[fd].nlinks) |
76 |
> |
if (fd < 0 | fd >= nhdfrags || !hdfrag[fd].nlinks) |
77 |
|
return; |
78 |
|
if (!--hdfrag[fd].nlinks && hdfrag[fd].nfrags) { |
79 |
|
free((char *)hdfrag[fd].fi); |
211 |
|
|
212 |
|
|
213 |
|
long |
214 |
+ |
hdfilen(fd) /* return file length for fd */ |
215 |
+ |
int fd; |
216 |
+ |
{ |
217 |
+ |
long fpos, flen; |
218 |
+ |
|
219 |
+ |
if (fd < 0) |
220 |
+ |
return(-1); |
221 |
+ |
if (fd >= nhdfrags || !hdfrag[fd].nlinks) { |
222 |
+ |
if ((fpos = lseek(fd, 0L, 1)) < 0) |
223 |
+ |
return(-1); |
224 |
+ |
flen = lseek(fd, 0L, 2); |
225 |
+ |
lseek(fd, fpos, 0); |
226 |
+ |
return(flen); |
227 |
+ |
} |
228 |
+ |
return(hdfrag[fd].flen); |
229 |
+ |
} |
230 |
+ |
|
231 |
+ |
|
232 |
+ |
long |
233 |
|
hdfiluse(fd, all) /* compute file usage (in bytes) */ |
234 |
|
int fd; /* open file descriptor to check */ |
235 |
|
int all; /* include overhead and unflushed data */ |
335 |
|
|
336 |
|
|
337 |
|
int |
338 |
< |
hdgetbi(hp, i) /* allocate a file fragment */ |
338 |
> |
hdsyncbi(hp, i) /* sync beam in memory with beam on disk */ |
339 |
|
register HOLO *hp; |
340 |
|
register int i; |
341 |
|
{ |
342 |
< |
int nrays = hp->bl[i]->nrm; |
343 |
< |
|
344 |
< |
if (hp->bi[i].nrd == nrays) /* current one will do? */ |
342 |
> |
unsigned int nrays = hp->bl[i]->nrm; |
343 |
> |
long nfo; |
344 |
> |
unsigned int n; |
345 |
> |
/* is current fragment OK? */ |
346 |
> |
if (nrays == hp->bi[i].nrd) |
347 |
|
return(0); |
348 |
+ |
/* check file status */ |
349 |
+ |
if (hp->dirty < 0) |
350 |
+ |
return(-1); |
351 |
|
|
352 |
|
if (hp->fd >= nhdfrags || !hdfrag[hp->fd].nlinks) /* untracked */ |
353 |
|
hp->bi[i].fo = lseek(hp->fd, 0L, 2); |
354 |
|
|
355 |
|
else if (hp->bi[i].fo + hp->bi[i].nrd*sizeof(RAYVAL) == |
356 |
|
hdfrag[hp->fd].flen) /* EOF special case */ |
357 |
< |
hdfrag[hp->fd].flen = hp->bi[i].fo + nrays*sizeof(RAYVAL); |
357 |
> |
hdfrag[hp->fd].flen = (nfo=hp->bi[i].fo) + nrays*sizeof(RAYVAL); |
358 |
|
|
359 |
|
else { /* general case */ |
360 |
|
register struct fragment *f = &hdfrag[hp->fd]; |
375 |
|
(j+FRAGBLK)*sizeof(BEAMI)); |
376 |
|
if (f->fi == NULL) |
377 |
|
error(SYSTEM, |
378 |
< |
"out of memory in hdgetbi"); |
378 |
> |
"out of memory in hdsyncbi"); |
379 |
|
} |
380 |
|
for ( ; ; j--) { /* insert in descending list */ |
381 |
|
if (!j || hp->bi[i].fo < f->fi[j-1].fo) { |
400 |
|
f->nfrags = j; |
401 |
|
} |
402 |
|
k = -1; /* find closest-sized fragment */ |
403 |
< |
for (j = f->nfrags; j-- > 0; ) |
403 |
> |
for (j = nrays ? f->nfrags : 0; j-- > 0; ) |
404 |
|
if (f->fi[j].nrd >= nrays && |
405 |
|
(k < 0 || f->fi[j].nrd < f->fi[k].nrd)) |
406 |
|
if (f->fi[k=j].nrd == nrays) |
407 |
|
break; |
408 |
|
if (k < 0) { /* no fragment -- extend file */ |
409 |
< |
hp->bi[i].fo = f->flen; |
409 |
> |
nfo = f->flen; |
410 |
|
f->flen += nrays*sizeof(RAYVAL); |
411 |
|
} else { /* else use fragment */ |
412 |
< |
hp->bi[i].fo = f->fi[k].fo; |
412 |
> |
nfo = f->fi[k].fo; |
413 |
|
if (f->fi[k].nrd == nrays) { /* delete fragment */ |
414 |
|
f->nfrags--; |
415 |
|
for (j = k; j < f->nfrags; j++) |
420 |
|
} |
421 |
|
} |
422 |
|
} |
423 |
+ |
if (nrays) { /* write the new fragment */ |
424 |
+ |
errno = 0; |
425 |
+ |
if (lseek(hp->fd, nfo, 0) < 0) |
426 |
+ |
error(SYSTEM, "cannot seek on holodeck file"); |
427 |
+ |
n = hp->bl[i]->nrm * sizeof(RAYVAL); |
428 |
+ |
if (write(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) { |
429 |
+ |
hp->dirty = -1; /* avoid recursive error */ |
430 |
+ |
error(SYSTEM, "write error in hdsyncbi"); |
431 |
+ |
} |
432 |
+ |
} |
433 |
|
biglob(hp)->nrd += nrays - hp->bi[i].nrd; |
434 |
|
hp->bi[i].nrd = nrays; |
435 |
+ |
hp->bi[i].fo = nfo; |
436 |
|
markdirty(hp); /* section directory now out of date */ |
437 |
|
return(1); |
438 |
|
} |
443 |
|
register HOLO *hp; |
444 |
|
register int i; |
445 |
|
{ |
446 |
< |
int nchanged, n; |
446 |
> |
int nchanged; |
447 |
|
|
448 |
|
if (hp == NULL) { /* clear all holodecks */ |
449 |
|
nchanged = 0; |
453 |
|
} |
454 |
|
if (i == 0) { /* clear entire holodeck */ |
455 |
|
nchanged = 0; |
456 |
< |
for (i = 1; i <= nbeams(hp); i++) |
457 |
< |
nchanged += hdfreebeam(hp, i); |
456 |
> |
for (i = nbeams(hp); i > 0; i--) |
457 |
> |
if (hp->bl[i] != NULL) |
458 |
> |
nchanged += hdfreebeam(hp, i); |
459 |
|
return(nchanged); |
460 |
|
} |
461 |
|
if (i < 1 | i > nbeams(hp)) |
464 |
|
return(0); |
465 |
|
/* check for additions */ |
466 |
|
nchanged = hp->bl[i]->nrm - hp->bi[i].nrd; |
467 |
< |
if (nchanged) { |
468 |
< |
hdgetbi(hp, i); /* allocate a file position */ |
433 |
< |
errno = 0; |
434 |
< |
if (lseek(hp->fd, hp->bi[i].fo, 0) < 0) |
435 |
< |
error(SYSTEM, "cannot seek on holodeck file"); |
436 |
< |
n = hp->bl[i]->nrm * sizeof(RAYVAL); |
437 |
< |
if (write(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) |
438 |
< |
error(SYSTEM, "write error in hdfreebeam"); |
439 |
< |
} |
467 |
> |
if (nchanged) |
468 |
> |
hdsyncbi(hp, i); /* write new fragment */ |
469 |
|
blglob(hp)->nrm -= hp->bl[i]->nrm; |
470 |
|
free((char *)hp->bl[i]); /* free memory */ |
471 |
|
hp->bl[i] = NULL; |
473 |
|
} |
474 |
|
|
475 |
|
|
476 |
+ |
int |
477 |
+ |
hdkillbeam(hp, i) /* delete beam from holodeck */ |
478 |
+ |
register HOLO *hp; |
479 |
+ |
register int i; |
480 |
+ |
{ |
481 |
+ |
static BEAM emptybeam; |
482 |
+ |
int nchanged; |
483 |
+ |
|
484 |
+ |
if (hp == NULL) { /* clobber all holodecks */ |
485 |
+ |
nchanged = 0; |
486 |
+ |
for (i = 0; hdlist[i] != NULL; i++) |
487 |
+ |
nchanged += hdkillbeam(hdlist[i], 0); |
488 |
+ |
return(nchanged); |
489 |
+ |
} |
490 |
+ |
if (i == 0) { /* clobber entire holodeck */ |
491 |
+ |
nchanged = 0; |
492 |
+ |
for (i = nbeams(hp); i > 0; i--) |
493 |
+ |
if (hp->bi[i].nrd > 0 || hp->bl[i] != NULL) |
494 |
+ |
nchanged += hdkillbeam(hp, i); |
495 |
+ |
#ifdef DEBUG |
496 |
+ |
if (biglob(hp)->nrd != 0 | blglob(hp)->nrm != 0) |
497 |
+ |
error(CONSISTENCY, "bad beam count in hdkillbeam"); |
498 |
+ |
#endif |
499 |
+ |
return(nchanged); |
500 |
+ |
} |
501 |
+ |
if (i < 1 | i > nbeams(hp)) |
502 |
+ |
error(CONSISTENCY, "bad beam index to hdkillbeam"); |
503 |
+ |
if (hp->bl[i] != NULL) { /* free memory */ |
504 |
+ |
blglob(hp)->nrm -= nchanged = hp->bl[i]->nrm; |
505 |
+ |
free((char *)hp->bl[i]); |
506 |
+ |
} else |
507 |
+ |
nchanged = hp->bi[i].nrd; |
508 |
+ |
if (hp->bi[i].nrd) { /* free file fragment */ |
509 |
+ |
hp->bl[i] = &emptybeam; |
510 |
+ |
hdsyncbi(hp, i); |
511 |
+ |
} |
512 |
+ |
hp->bl[i] = NULL; |
513 |
+ |
return(nchanged); |
514 |
+ |
} |
515 |
+ |
|
516 |
+ |
|
517 |
|
hdlrulist(ha, ba, n, hp) /* add beams from holodeck to LRU list */ |
518 |
|
register HOLO *ha[]; /* section list (NULL terminated) */ |
519 |
|
register int ba[]; /* beam index to go with section */ |
527 |
|
; |
528 |
|
nents = j; |
529 |
|
/* insert each beam from hp */ |
530 |
< |
for (i = nbeams(hp); i > 0; i-- ) { |
530 |
> |
for (i = nbeams(hp); i > 0; i--) { |
531 |
|
if (hp->bl[i] == NULL) /* check if loaded */ |
532 |
|
continue; |
533 |
|
if ((j = ++nents) > n) /* grow list if we can */ |