1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id$"; |
3 |
#endif |
4 |
/* |
5 |
* Routines for managing holodeck files |
6 |
* |
7 |
* 9/30/97 GWLarson |
8 |
*/ |
9 |
|
10 |
#include "holo.h" |
11 |
|
12 |
#ifndef CACHESIZE |
13 |
#ifdef SMLMEM |
14 |
#define CACHESIZE 5 |
15 |
#else |
16 |
#define CACHESIZE 17 /* default cache size (Mbytes, 0==inf) */ |
17 |
#endif |
18 |
#endif |
19 |
#ifndef FREEBEAMS |
20 |
#define FREEBEAMS 1500 /* maximum beams to free at a time */ |
21 |
#endif |
22 |
#ifndef PCTFREE |
23 |
#define PCTFREE 15 /* maximum fraction to free (%) */ |
24 |
#endif |
25 |
#ifndef MAXFRAGB |
26 |
#define MAXFRAGB 16 /* fragment blocks/file to track (0==inf) */ |
27 |
#endif |
28 |
#ifndef FF_DEFAULT |
29 |
/* when to free a beam fragment */ |
30 |
#define FF_DEFAULT (FF_WRITE|FF_KILL) |
31 |
#endif |
32 |
#ifndef MINDIRSEL |
33 |
/* minimum directory seek length */ |
34 |
#define MINDIRSEL (4*BUFSIZ/sizeof(BEAMI)) |
35 |
#endif |
36 |
|
37 |
#ifndef BSD |
38 |
#define write writebuf /* safe i/o routines */ |
39 |
#define read readbuf |
40 |
#endif |
41 |
|
42 |
#define FRAGBLK 512 /* number of fragments to allocate at a time */ |
43 |
|
44 |
int hdfragflags = FF_DEFAULT; /* tells when to free fragments */ |
45 |
unsigned hdcachesize = CACHESIZE*1024*1024; /* target cache size */ |
46 |
unsigned long hdclock; /* clock value */ |
47 |
|
48 |
HOLO *hdlist[HDMAX+1]; /* holodeck pointers (NULL term.) */ |
49 |
|
50 |
static struct fraglist { |
51 |
short nlinks; /* number of holodeck sections using us */ |
52 |
short writable; /* 0 read-only, <0 write error encountered */ |
53 |
int nfrags; /* number of known fragments */ |
54 |
BEAMI *fi; /* fragments, descending file position */ |
55 |
off_t flen; /* last known file length */ |
56 |
} *hdfragl; /* fragment lists, indexed by file descriptor */ |
57 |
|
58 |
static int nhdfragls; /* size of hdfragl array */ |
59 |
|
60 |
|
61 |
HOLO * |
62 |
hdalloc(hproto) /* allocate and set holodeck section based on grid */ |
63 |
HDGRID *hproto; |
64 |
{ |
65 |
HOLO hdhead; |
66 |
register HOLO *hp; |
67 |
int n; |
68 |
/* copy grid to temporary header */ |
69 |
bcopy((void *)hproto, (void *)&hdhead, sizeof(HDGRID)); |
70 |
/* compute grid vectors and sizes */ |
71 |
hdcompgrid(&hdhead); |
72 |
/* allocate header with directory */ |
73 |
n = sizeof(HOLO)+nbeams(&hdhead)*sizeof(BEAMI); |
74 |
if ((hp = (HOLO *)malloc(n)) == NULL) |
75 |
return(NULL); |
76 |
/* copy header information */ |
77 |
copystruct(hp, &hdhead); |
78 |
/* allocate and clear beam list */ |
79 |
hp->bl = (BEAM **)malloc((nbeams(hp)+1)*sizeof(BEAM *)+sizeof(BEAM)); |
80 |
if (hp->bl == NULL) { |
81 |
free((void *)hp); |
82 |
return(NULL); |
83 |
} |
84 |
bzero((void *)hp->bl, (nbeams(hp)+1)*sizeof(BEAM *)+sizeof(BEAM)); |
85 |
hp->bl[0] = (BEAM *)(hp->bl+nbeams(hp)+1); /* set blglob(hp) */ |
86 |
hp->fd = -1; |
87 |
hp->dirty = 0; |
88 |
hp->priv = NULL; |
89 |
/* clear beam directory */ |
90 |
bzero((void *)hp->bi, (nbeams(hp)+1)*sizeof(BEAMI)); |
91 |
return(hp); /* all is well */ |
92 |
} |
93 |
|
94 |
|
95 |
char * |
96 |
hdrealloc(ptr, siz, rout) /* (re)allocate memory, retry then error */ |
97 |
char *ptr; |
98 |
unsigned siz; |
99 |
char *rout; |
100 |
{ |
101 |
register char *newp; |
102 |
/* call malloc/realloc */ |
103 |
if (ptr == NULL) newp = (char *)malloc(siz); |
104 |
else newp = (char *)realloc((void *)ptr, siz); |
105 |
/* check success */ |
106 |
if (newp == NULL && rout != NULL) { |
107 |
hdfreecache(25, NULL); /* free some memory */ |
108 |
errno = 0; /* retry */ |
109 |
newp = hdrealloc(ptr, siz, NULL); |
110 |
if (newp == NULL) { /* give up and report error */ |
111 |
sprintf(errmsg, "out of memory in %s", rout); |
112 |
error(SYSTEM, errmsg); |
113 |
} |
114 |
} |
115 |
return(newp); |
116 |
} |
117 |
|
118 |
|
119 |
hdattach(fd, wr) /* start tracking file fragments for some section */ |
120 |
register int fd; |
121 |
int wr; |
122 |
{ |
123 |
if (fd >= nhdfragls) { |
124 |
hdfragl = (struct fraglist *)hdrealloc((char *)hdfragl, |
125 |
(fd+1)*sizeof(struct fraglist), "hdattach"); |
126 |
bzero((void *)(hdfragl+nhdfragls), |
127 |
(fd+1-nhdfragls)*sizeof(struct fraglist)); |
128 |
nhdfragls = fd+1; |
129 |
} |
130 |
hdfragl[fd].nlinks++; |
131 |
hdfragl[fd].writable = wr; /* set writable flag */ |
132 |
hdfragl[fd].flen = lseek(fd, (off_t)0L, 2); /* get file length */ |
133 |
} |
134 |
|
135 |
|
136 |
/* Do we need a routine to locate file fragments given known occupants? */ |
137 |
|
138 |
|
139 |
hdrelease(fd) /* stop tracking file fragments for some section */ |
140 |
register int fd; |
141 |
{ |
142 |
if (fd < 0 | fd >= nhdfragls || !hdfragl[fd].nlinks) |
143 |
return; |
144 |
if (!--hdfragl[fd].nlinks && hdfragl[fd].nfrags) { |
145 |
free((void *)hdfragl[fd].fi); |
146 |
hdfragl[fd].fi = NULL; |
147 |
hdfragl[fd].nfrags = 0; |
148 |
} |
149 |
} |
150 |
|
151 |
|
152 |
HOLO * |
153 |
hdinit(fd, hproto) /* initialize a holodeck section in a file */ |
154 |
int fd; /* corresponding file descriptor */ |
155 |
HDGRID *hproto; /* holodeck section grid */ |
156 |
{ |
157 |
off_t rtrunc; |
158 |
off_t fpos; |
159 |
int writable; |
160 |
register HOLO *hp; |
161 |
register int n; |
162 |
/* prepare for system errors */ |
163 |
errno = 0; |
164 |
if ((fpos = lseek(fd, (off_t)0L, 1)) < 0) |
165 |
error(SYSTEM, "cannot determine holodeck file position"); |
166 |
if (hproto == NULL) { /* assume we're loading it */ |
167 |
HDGRID hpr; |
168 |
/* load header */ |
169 |
if (read(fd, (char *)&hpr, sizeof(HDGRID)) != sizeof(HDGRID)) |
170 |
error(SYSTEM, "cannot load holodeck header"); |
171 |
/* allocate grid */ |
172 |
if ((hp = hdalloc(&hpr)) == NULL) |
173 |
goto memerr; |
174 |
/* load beam directory */ |
175 |
n = nbeams(hp)*sizeof(BEAMI); |
176 |
if (read(fd, (char *)(hp->bi+1), n) != n) |
177 |
error(SYSTEM, "failure loading holodeck directory"); |
178 |
/* check that it's clean */ |
179 |
for (n = nbeams(hp); n > 0; n--) |
180 |
if (hp->bi[n].fo < 0) { |
181 |
hp->bi[n].fo = 0; |
182 |
error(WARNING, "dirty holodeck section"); |
183 |
break; |
184 |
} |
185 |
/* check writability */ |
186 |
if (fd < nhdfragls && hdfragl[fd].nlinks) |
187 |
writable = hdfragl[fd].writable; |
188 |
else |
189 |
writable = lseek(fd, fpos, 0) == fpos && |
190 |
write(fd, (char *)hp, sizeof(HDGRID)) == |
191 |
sizeof(HDGRID); |
192 |
} else { /* else assume we're creating it */ |
193 |
if ((hp = hdalloc(hproto)) == NULL) |
194 |
goto memerr; |
195 |
/* write header and skeleton */ |
196 |
n = nbeams(hp)*sizeof(BEAMI); |
197 |
if (write(fd, (char *)hproto, sizeof(HDGRID)) != |
198 |
sizeof(HDGRID) || |
199 |
write(fd, (char *)(hp->bi+1), n) != n) |
200 |
error(SYSTEM, "cannot write header to holodeck file"); |
201 |
writable = 1; |
202 |
} |
203 |
hp->fd = fd; |
204 |
hp->dirty = 0; |
205 |
biglob(hp)->fo = fpos + sizeof(HDGRID); |
206 |
/* start tracking fragments */ |
207 |
hdattach(fd, writable); |
208 |
/* check rays on disk */ |
209 |
fpos = hdfilen(fd); |
210 |
biglob(hp)->nrd = rtrunc = 0; |
211 |
for (n = hproto == NULL ? nbeams(hp) : 0; n > 0; n--) |
212 |
if (hp->bi[n].nrd) |
213 |
if (hp->bi[n].fo+hp->bi[n].nrd*sizeof(RAYVAL) > fpos) { |
214 |
rtrunc += hp->bi[n].nrd; |
215 |
hp->bi[n].nrd = 0; |
216 |
} else |
217 |
biglob(hp)->nrd += hp->bi[n].nrd; |
218 |
if (rtrunc) { |
219 |
sprintf(errmsg, "truncated section, %ld rays lost (%.1f%%)", |
220 |
rtrunc, 100.*rtrunc/(rtrunc+biglob(hp)->nrd)); |
221 |
error(WARNING, errmsg); |
222 |
} |
223 |
/* add to holodeck list */ |
224 |
for (n = 0; n < HDMAX; n++) |
225 |
if (hdlist[n] == NULL) { |
226 |
hdlist[n] = hp; |
227 |
break; |
228 |
} |
229 |
/* all done */ |
230 |
return(hp); |
231 |
memerr: |
232 |
error(SYSTEM, "cannot allocate holodeck grid"); |
233 |
} |
234 |
|
235 |
|
236 |
hdmarkdirty(hp, i) /* mark holodeck directory position dirty */ |
237 |
register HOLO *hp; |
238 |
int i; |
239 |
{ |
240 |
static BEAMI smudge = {0, -1}; |
241 |
int mindist, minpos; |
242 |
register int j; |
243 |
|
244 |
if (!hp->dirty++) { /* write smudge first time */ |
245 |
if (lseek(hp->fd, biglob(hp)->fo+(i-1)*sizeof(BEAMI), 0) < 0 |
246 |
|| write(hp->fd, (char *)&smudge, |
247 |
sizeof(BEAMI)) != sizeof(BEAMI)) |
248 |
error(SYSTEM, "seek/write error in hdmarkdirty"); |
249 |
hp->dirseg[0].s = i; |
250 |
hp->dirseg[0].n = 1; |
251 |
return; |
252 |
} |
253 |
/* insert into segment list */ |
254 |
for (j = hp->dirty; j--; ) { |
255 |
if (!j || hp->dirseg[j-1].s < i) { |
256 |
hp->dirseg[j].s = i; |
257 |
hp->dirseg[j].n = 1; |
258 |
break; |
259 |
} |
260 |
copystruct(hp->dirseg+j, hp->dirseg+(j-1)); |
261 |
} |
262 |
do { /* check neighbors */ |
263 |
mindist = nbeams(hp); /* find closest */ |
264 |
for (j = hp->dirty; --j; ) |
265 |
if (hp->dirseg[j].s - |
266 |
(hp->dirseg[j-1].s + hp->dirseg[j-1].n) |
267 |
< mindist) { |
268 |
minpos = j; |
269 |
mindist = hp->dirseg[j].s - |
270 |
(hp->dirseg[j-1].s + hp->dirseg[j-1].n); |
271 |
} |
272 |
/* good enough? */ |
273 |
if (hp->dirty <= MAXDIRSE && mindist > MINDIRSEL) |
274 |
break; |
275 |
j = minpos - 1; /* coalesce neighbors */ |
276 |
if (hp->dirseg[j].s + hp->dirseg[j].n < |
277 |
hp->dirseg[minpos].s + hp->dirseg[minpos].n) |
278 |
hp->dirseg[j].n = hp->dirseg[minpos].s + |
279 |
hp->dirseg[minpos].n - hp->dirseg[j].s; |
280 |
hp->dirty--; |
281 |
while (++j < hp->dirty) /* close the gap */ |
282 |
copystruct(hp->dirseg+j, hp->dirseg+(j+1)); |
283 |
} while (mindist <= MINDIRSEL); |
284 |
} |
285 |
|
286 |
|
287 |
int |
288 |
hdsync(hp, all) /* update beams and directory on disk */ |
289 |
register HOLO *hp; |
290 |
int all; |
291 |
{ |
292 |
register int j, n; |
293 |
|
294 |
if (hp == NULL) { /* do all holodecks */ |
295 |
n = 0; |
296 |
for (j = 0; hdlist[j] != NULL; j++) |
297 |
n += hdsync(hdlist[j], all); |
298 |
return(n); |
299 |
} |
300 |
/* sync the beams */ |
301 |
for (j = (all ? nbeams(hp) : 0); j > 0; j--) |
302 |
if (hp->bl[j] != NULL) |
303 |
hdsyncbeam(hp, j); |
304 |
if (!hp->dirty) /* directory clean? */ |
305 |
return(0); |
306 |
errno = 0; /* write dirty segments */ |
307 |
for (j = 0; j < hp->dirty; j++) { |
308 |
if (lseek(hp->fd, biglob(hp)->fo + |
309 |
(hp->dirseg[j].s-1)*sizeof(BEAMI), 0) < 0) |
310 |
error(SYSTEM, "cannot seek on holodeck file"); |
311 |
n = hp->dirseg[j].n * sizeof(BEAMI); |
312 |
if (write(hp->fd, (char *)(hp->bi+hp->dirseg[j].s), n) != n) |
313 |
error(SYSTEM, "cannot update section directory"); |
314 |
} |
315 |
hp->dirty = 0; /* all clean */ |
316 |
return(1); |
317 |
} |
318 |
|
319 |
|
320 |
unsigned |
321 |
hdmemuse(all) /* return memory usage (in bytes) */ |
322 |
int all; /* include overhead (painful) */ |
323 |
{ |
324 |
long total = 0; |
325 |
register int i, j; |
326 |
|
327 |
for (j = 0; hdlist[j] != NULL; j++) { |
328 |
total += blglob(hdlist[j])->nrm * sizeof(RAYVAL); |
329 |
if (all) { |
330 |
total += sizeof(HOLO) + sizeof(BEAM *) + |
331 |
nbeams(hdlist[j]) * |
332 |
(sizeof(BEAM *)+sizeof(BEAMI)); |
333 |
for (i = nbeams(hdlist[j]); i > 0; i--) |
334 |
if (hdlist[j]->bl[i] != NULL) |
335 |
total += sizeof(BEAM); |
336 |
} |
337 |
} |
338 |
if (all) |
339 |
for (j = 0; j < nhdfragls; j++) { |
340 |
total += sizeof(struct fraglist); |
341 |
if (hdfragl[j].nfrags) |
342 |
total += FRAGBLK*sizeof(BEAMI) * |
343 |
((hdfragl[j].nfrags-1)/FRAGBLK + 1) ; |
344 |
} |
345 |
return(total); |
346 |
} |
347 |
|
348 |
|
349 |
off_t |
350 |
hdfilen(fd) /* return file length for fd */ |
351 |
int fd; |
352 |
{ |
353 |
off_t fpos, flen; |
354 |
|
355 |
if (fd < 0) |
356 |
return(-1); |
357 |
if (fd >= nhdfragls || !hdfragl[fd].nlinks) { |
358 |
if ((fpos = lseek(fd, (off_t)0L, 1)) < 0) |
359 |
return(-1); |
360 |
flen = lseek(fd, (off_t)0L, 2); |
361 |
lseek(fd, fpos, 0); |
362 |
return(flen); |
363 |
} |
364 |
return(hdfragl[fd].flen); |
365 |
} |
366 |
|
367 |
|
368 |
off_t |
369 |
hdfiluse(fd, all) /* compute file usage (in bytes) */ |
370 |
int fd; /* open file descriptor to check */ |
371 |
int all; /* include overhead and unflushed data */ |
372 |
{ |
373 |
off_t total = 0; |
374 |
register int i, j; |
375 |
|
376 |
for (j = 0; hdlist[j] != NULL; j++) { |
377 |
if (hdlist[j]->fd != fd) |
378 |
continue; |
379 |
total += biglob(hdlist[j])->nrd * sizeof(RAYVAL); |
380 |
if (all) { |
381 |
for (i = nbeams(hdlist[j]); i > 0; i--) |
382 |
if (hdlist[j]->bl[i] != NULL) |
383 |
total += sizeof(RAYVAL) * |
384 |
(hdlist[j]->bl[i]->nrm - |
385 |
hdlist[j]->bi[i].nrd); |
386 |
total += sizeof(HDGRID) + |
387 |
nbeams(hdlist[j])*sizeof(BEAMI); |
388 |
} |
389 |
} |
390 |
return(total); /* does not include fragments */ |
391 |
} |
392 |
|
393 |
|
394 |
RAYVAL * |
395 |
hdnewrays(hp, i, nr) /* allocate space for add'l rays and return pointer */ |
396 |
register HOLO *hp; |
397 |
register int i; |
398 |
int nr; /* number of new rays desired */ |
399 |
{ |
400 |
RAYVAL *p; |
401 |
int n; |
402 |
|
403 |
if (nr <= 0) return(NULL); |
404 |
CHECK(i < 1 | i > nbeams(hp), |
405 |
CONSISTENCY, "bad beam index given to hdnewrays"); |
406 |
if (hp->bl[i] != NULL) |
407 |
hp->bl[i]->tick = hdclock; /* preempt swap */ |
408 |
if (hdcachesize > 0 && hdmemuse(0) >= hdcachesize) |
409 |
hdfreecache(PCTFREE, NULL); /* free some space */ |
410 |
if (hp->bl[i] == NULL) { /* allocate (and load) */ |
411 |
n = hp->bi[i].nrd + nr; |
412 |
hp->bl[i] = (BEAM *)hdrealloc(NULL, hdbsiz(n), "hdnewrays"); |
413 |
blglob(hp)->nrm += n; |
414 |
if ((n = hp->bl[i]->nrm = hp->bi[i].nrd)) { |
415 |
errno = 0; |
416 |
if (lseek(hp->fd, hp->bi[i].fo, 0) < 0) |
417 |
error(SYSTEM, "seek error on holodeck file"); |
418 |
n *= sizeof(RAYVAL); |
419 |
if (read(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) |
420 |
error(SYSTEM, |
421 |
"error reading beam from holodeck file"); |
422 |
} |
423 |
} else { /* just grow in memory */ |
424 |
hp->bl[i] = (BEAM *)hdrealloc((char *)hp->bl[i], |
425 |
hdbsiz(hp->bl[i]->nrm + nr), "hdnewrays"); |
426 |
blglob(hp)->nrm += nr; |
427 |
} |
428 |
if (hdfragflags&FF_ALLOC && hp->bi[i].nrd) |
429 |
hdfreefrag(hp, i); /* relinquish old fragment */ |
430 |
p = hdbray(hp->bl[i]) + hp->bl[i]->nrm; |
431 |
hp->bl[i]->nrm += nr; /* update in-core structure */ |
432 |
bzero((void *)p, nr*sizeof(RAYVAL)); |
433 |
blglob(hp)->tick = hp->bl[i]->tick = hdclock++; /* update LRU clock */ |
434 |
return(p); /* point to new rays */ |
435 |
} |
436 |
|
437 |
|
438 |
BEAM * |
439 |
hdgetbeam(hp, i) /* get beam (from file if necessary) */ |
440 |
register HOLO *hp; |
441 |
register int i; |
442 |
{ |
443 |
register int n; |
444 |
|
445 |
CHECK(i < 1 | i > nbeams(hp), |
446 |
CONSISTENCY, "bad beam index given to hdgetbeam"); |
447 |
if (hp->bl[i] == NULL) { /* load from disk */ |
448 |
if (!(n = hp->bi[i].nrd)) |
449 |
return(NULL); |
450 |
if (hdcachesize > 0 && hdmemuse(0) >= hdcachesize) |
451 |
hdfreecache(PCTFREE, NULL); /* get free space */ |
452 |
hp->bl[i] = (BEAM *)hdrealloc(NULL, hdbsiz(n), "hdgetbeam"); |
453 |
blglob(hp)->nrm += hp->bl[i]->nrm = n; |
454 |
errno = 0; |
455 |
if (lseek(hp->fd, hp->bi[i].fo, 0) < 0) |
456 |
error(SYSTEM, "seek error on holodeck file"); |
457 |
n *= sizeof(RAYVAL); |
458 |
if (read(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) |
459 |
error(SYSTEM, "error reading beam from holodeck file"); |
460 |
if (hdfragflags&FF_READ) |
461 |
hdfreefrag(hp, i); /* relinquish old frag. */ |
462 |
} |
463 |
blglob(hp)->tick = hp->bl[i]->tick = hdclock++; /* update LRU clock */ |
464 |
return(hp->bl[i]); |
465 |
} |
466 |
|
467 |
|
468 |
int |
469 |
hdfilord(hb1, hb2) /* order beams for quick loading */ |
470 |
register HDBEAMI *hb1, *hb2; |
471 |
{ |
472 |
register long c; |
473 |
/* residents go first */ |
474 |
if (hb2->h->bl[hb2->b] != NULL) |
475 |
return(hb1->h->bl[hb1->b] == NULL); |
476 |
if (hb1->h->bl[hb1->b] != NULL) |
477 |
return(-1); |
478 |
/* otherwise sort by file descriptor */ |
479 |
if ((c = hb1->h->fd - hb2->h->fd)) |
480 |
return(c); |
481 |
/* then by position in file */ |
482 |
c = hb1->h->bi[hb1->b].fo - hb2->h->bi[hb2->b].fo; |
483 |
return(c > 0 ? 1 : c < 0 ? -1 : 0); |
484 |
} |
485 |
|
486 |
|
487 |
hdloadbeams(hb, n, bf) /* load a list of beams in optimal order */ |
488 |
register HDBEAMI *hb; /* list gets sorted by hdfilord() */ |
489 |
int n; /* list length */ |
490 |
int (*bf)(); /* callback function (optional) */ |
491 |
{ |
492 |
unsigned origcachesize, memuse; |
493 |
int bytesloaded, needbytes, bytes2free; |
494 |
register BEAM *bp; |
495 |
register int i; |
496 |
/* precheck consistency */ |
497 |
if (n <= 0) return; |
498 |
for (i = n; i--; ) |
499 |
if (hb[i].h==NULL || hb[i].b<1 | hb[i].b>nbeams(hb[i].h)) |
500 |
error(CONSISTENCY, "bad beam in hdloadbeams"); |
501 |
/* sort list for optimal access */ |
502 |
qsort((void *)hb, n, sizeof(HDBEAMI), hdfilord); |
503 |
bytesloaded = 0; /* run through loaded beams */ |
504 |
for ( ; n && (bp = hb->h->bl[hb->b]) != NULL; n--, hb++) { |
505 |
bp->tick = hdclock; /* preempt swap */ |
506 |
bytesloaded += bp->nrm; |
507 |
if (bf != NULL) |
508 |
(*bf)(bp, hb); |
509 |
} |
510 |
bytesloaded *= sizeof(RAYVAL); |
511 |
if ((origcachesize = hdcachesize) > 0) { |
512 |
needbytes = 0; /* figure out memory needs */ |
513 |
for (i = n; i--; ) |
514 |
needbytes += hb[i].h->bi[hb[i].b].nrd; |
515 |
needbytes *= sizeof(RAYVAL); |
516 |
do { /* free enough memory */ |
517 |
memuse = hdmemuse(0); |
518 |
bytes2free = needbytes - (int)(hdcachesize-memuse); |
519 |
if (bytes2free > (int)(memuse - bytesloaded)) |
520 |
bytes2free = memuse - bytesloaded; |
521 |
} while (bytes2free > 0 && |
522 |
hdfreecache(100*bytes2free/memuse, NULL) < 0); |
523 |
hdcachesize = 0; /* load beams w/o swap */ |
524 |
} |
525 |
for (i = 0; i < n; i++) |
526 |
if ((bp = hdgetbeam(hb[i].h, hb[i].b)) != NULL && bf != NULL) |
527 |
(*bf)(bp, hb+i); |
528 |
hdcachesize = origcachesize; /* resume dynamic swapping */ |
529 |
} |
530 |
|
531 |
|
532 |
int |
533 |
hdfreefrag(hp, i) /* free a file fragment */ |
534 |
HOLO *hp; |
535 |
int i; |
536 |
{ |
537 |
register BEAMI *bi = &hp->bi[i]; |
538 |
register struct fraglist *f; |
539 |
register int j, k; |
540 |
|
541 |
if (bi->nrd <= 0) |
542 |
return(0); |
543 |
DCHECK(hp->fd < 0 | hp->fd >= nhdfragls || !hdfragl[hp->fd].nlinks, |
544 |
CONSISTENCY, "bad file descriptor in hdfreefrag"); |
545 |
f = &hdfragl[hp->fd]; |
546 |
if (!f->writable) |
547 |
return(0); |
548 |
if (f->nfrags % FRAGBLK == 0) { /* delete empty remnants */ |
549 |
for (j = k = 0; k < f->nfrags; j++, k++) { |
550 |
while (f->fi[k].nrd == 0) |
551 |
if (++k >= f->nfrags) |
552 |
goto endloop; |
553 |
if (k > j) |
554 |
copystruct(f->fi+j, f->fi+k); |
555 |
} |
556 |
endloop: |
557 |
f->nfrags = j; |
558 |
} |
559 |
j = f->nfrags++; /* allocate a slot in free list */ |
560 |
#if MAXFRAGB |
561 |
if (j >= MAXFRAGB*FRAGBLK) { |
562 |
f->nfrags = j--; /* stop list growth */ |
563 |
if (bi->nrd <= f->fi[j].nrd) |
564 |
return(0); /* new one no better than discard */ |
565 |
} |
566 |
#endif |
567 |
if (j % FRAGBLK == 0) { /* more (or less) free list space */ |
568 |
register BEAMI *newp; |
569 |
if (f->fi == NULL) |
570 |
newp = (BEAMI *)malloc((j+FRAGBLK)*sizeof(BEAMI)); |
571 |
else |
572 |
newp = (BEAMI *)realloc((void *)f->fi, |
573 |
(j+FRAGBLK)*sizeof(BEAMI)); |
574 |
if (newp == NULL) { |
575 |
f->nfrags--; /* graceful failure */ |
576 |
return(0); |
577 |
} |
578 |
f->fi = newp; |
579 |
} |
580 |
for ( ; ; j--) { /* insert in descending list */ |
581 |
if (!j || bi->fo < f->fi[j-1].fo) { |
582 |
f->fi[j].fo = bi->fo; |
583 |
f->fi[j].nrd = bi->nrd; |
584 |
break; |
585 |
} |
586 |
copystruct(f->fi+j, f->fi+(j-1)); |
587 |
} |
588 |
/* coalesce adjacent fragments */ |
589 |
/* successors never empty */ |
590 |
if (j && f->fi[j-1].fo == f->fi[j].fo + f->fi[j].nrd*sizeof(RAYVAL)) { |
591 |
f->fi[j].nrd += f->fi[j-1].nrd; |
592 |
f->fi[j-1].nrd = 0; |
593 |
} |
594 |
for (k = j+1; k < f->nfrags; k++) /* get non-empty predecessor */ |
595 |
if (f->fi[k].nrd) { |
596 |
if (f->fi[j].fo == f->fi[k].fo + |
597 |
f->fi[k].nrd*sizeof(RAYVAL)) { |
598 |
f->fi[k].nrd += f->fi[j].nrd; |
599 |
f->fi[j].nrd = 0; |
600 |
} |
601 |
break; |
602 |
} |
603 |
biglob(hp)->nrd -= bi->nrd; /* tell fragment it's free */ |
604 |
bi->nrd = 0; |
605 |
bi->fo = 0L; |
606 |
hdmarkdirty(hp, i); /* assume we'll reallocate */ |
607 |
return(1); |
608 |
} |
609 |
|
610 |
|
611 |
int |
612 |
hdfragOK(fd, listlen, listsiz) /* get fragment list status for file */ |
613 |
int fd; |
614 |
int *listlen; |
615 |
register int4 *listsiz; |
616 |
{ |
617 |
register struct fraglist *f; |
618 |
register int i; |
619 |
|
620 |
if (fd < 0 | fd >= nhdfragls || !(f = &hdfragl[fd])->nlinks) |
621 |
return(0); /* listless */ |
622 |
if (listlen != NULL) |
623 |
*listlen = f->nfrags; |
624 |
if (listsiz != NULL) |
625 |
for (i = f->nfrags, *listsiz = 0; i--; ) |
626 |
*listsiz += f->fi[i].nrd; |
627 |
#if MAXFRAGB |
628 |
return(f->nfrags < MAXFRAGB*FRAGBLK); |
629 |
#else |
630 |
return(1); /* list never fills up */ |
631 |
#endif |
632 |
} |
633 |
|
634 |
|
635 |
off_t |
636 |
hdallocfrag(fd, nrays) /* allocate a file fragment */ |
637 |
int fd; |
638 |
unsigned int4 nrays; |
639 |
{ |
640 |
register struct fraglist *f; |
641 |
register int j; |
642 |
off_t nfo; |
643 |
|
644 |
if (nrays == 0) |
645 |
return(-1L); |
646 |
DCHECK(fd < 0 | fd >= nhdfragls || !hdfragl[fd].nlinks, |
647 |
CONSISTENCY, "bad file descriptor in hdallocfrag"); |
648 |
f = &hdfragl[fd]; |
649 |
for (j = f->nfrags; j-- > 0; ) /* first fit algorithm */ |
650 |
if (f->fi[j].nrd >= nrays) |
651 |
break; |
652 |
if (j < 0) { /* no fragment -- extend file */ |
653 |
nfo = f->flen; |
654 |
f->flen += nrays*sizeof(RAYVAL); |
655 |
} else { /* else use fragment */ |
656 |
nfo = f->fi[j].fo; |
657 |
f->fi[j].fo += nrays*sizeof(RAYVAL); |
658 |
f->fi[j].nrd -= nrays; |
659 |
} |
660 |
return(nfo); |
661 |
} |
662 |
|
663 |
|
664 |
int |
665 |
hdsyncbeam(hp, i) /* sync beam in memory with beam on disk */ |
666 |
register HOLO *hp; |
667 |
register int i; |
668 |
{ |
669 |
int fragfreed; |
670 |
unsigned int4 nrays; |
671 |
unsigned int n; |
672 |
off_t nfo; |
673 |
/* check file status */ |
674 |
if (hdfragl[hp->fd].writable <= 0) |
675 |
return(hdfragl[hp->fd].writable); |
676 |
DCHECK(i < 1 | i > nbeams(hp), |
677 |
CONSISTENCY, "bad beam index in hdsyncbeam"); |
678 |
/* is current fragment OK? */ |
679 |
if (hp->bl[i] == NULL || (nrays = hp->bl[i]->nrm) == hp->bi[i].nrd) |
680 |
return(0); |
681 |
/* relinquish old fragment? */ |
682 |
fragfreed = hdfragflags&FF_WRITE && hp->bi[i].nrd && hdfreefrag(hp,i); |
683 |
if (nrays) { /* get and write new fragment */ |
684 |
nfo = hdallocfrag(hp->fd, nrays); |
685 |
errno = 0; |
686 |
if (lseek(hp->fd, nfo, 0) < 0) |
687 |
error(SYSTEM, "cannot seek on holodeck file"); |
688 |
n = hp->bl[i]->nrm * sizeof(RAYVAL); |
689 |
if (write(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) { |
690 |
hdfragl[hp->fd].writable = -1; |
691 |
hdsync(NULL, 0); /* sync directories */ |
692 |
error(SYSTEM, "write error in hdsyncbeam"); |
693 |
} |
694 |
hp->bi[i].fo = nfo; |
695 |
} else |
696 |
hp->bi[i].fo = 0L; |
697 |
biglob(hp)->nrd += nrays - hp->bi[i].nrd; |
698 |
hp->bi[i].nrd = nrays; |
699 |
if (!fragfreed) |
700 |
hdmarkdirty(hp, i); /* need to flag dir. ent. */ |
701 |
return(1); |
702 |
} |
703 |
|
704 |
|
705 |
int |
706 |
hdfreebeam(hp, i) /* free beam, writing if dirty */ |
707 |
register HOLO *hp; |
708 |
register int i; |
709 |
{ |
710 |
int nchanged; |
711 |
|
712 |
if (hp == NULL) { /* clear all holodecks */ |
713 |
nchanged = 0; |
714 |
for (i = 0; hdlist[i] != NULL; i++) |
715 |
nchanged += hdfreebeam(hdlist[i], 0); |
716 |
return(nchanged); |
717 |
} |
718 |
if (hdfragl[hp->fd].writable < 0) /* check for file error */ |
719 |
return(0); |
720 |
if (i == 0) { /* clear entire holodeck */ |
721 |
if (blglob(hp)->nrm == 0) |
722 |
return(0); /* already clear */ |
723 |
nchanged = 0; |
724 |
for (i = nbeams(hp); i > 0; i--) |
725 |
if (hp->bl[i] != NULL) |
726 |
nchanged += hdfreebeam(hp, i); |
727 |
DCHECK(blglob(hp)->nrm != 0, |
728 |
CONSISTENCY, "bad beam count in hdfreebeam"); |
729 |
return(nchanged); |
730 |
} |
731 |
DCHECK(i < 1 | i > nbeams(hp), |
732 |
CONSISTENCY, "bad beam index to hdfreebeam"); |
733 |
if (hp->bl[i] == NULL) |
734 |
return(0); |
735 |
/* check for additions */ |
736 |
nchanged = hp->bl[i]->nrm - hp->bi[i].nrd; |
737 |
if (nchanged) |
738 |
hdsyncbeam(hp, i); /* write new fragment */ |
739 |
blglob(hp)->nrm -= hp->bl[i]->nrm; |
740 |
free((void *)hp->bl[i]); /* free memory */ |
741 |
hp->bl[i] = NULL; |
742 |
return(nchanged); |
743 |
} |
744 |
|
745 |
|
746 |
int |
747 |
hdkillbeam(hp, i) /* delete beam from holodeck */ |
748 |
register HOLO *hp; |
749 |
register int i; |
750 |
{ |
751 |
int nchanged; |
752 |
|
753 |
if (hp == NULL) { /* clobber all holodecks */ |
754 |
nchanged = 0; |
755 |
for (i = 0; hdlist[i] != NULL; i++) |
756 |
nchanged += hdkillbeam(hdlist[i], 0); |
757 |
return(nchanged); |
758 |
} |
759 |
if (i == 0) { /* clobber entire holodeck */ |
760 |
if (biglob(hp)->nrd == 0 & blglob(hp)->nrm == 0) |
761 |
return(0); /* already empty */ |
762 |
nchanged = 0; |
763 |
nchanged = 0; |
764 |
for (i = nbeams(hp); i > 0; i--) |
765 |
if (hp->bi[i].nrd > 0 || hp->bl[i] != NULL) |
766 |
nchanged += hdkillbeam(hp, i); |
767 |
DCHECK(biglob(hp)->nrd != 0 | blglob(hp)->nrm != 0, |
768 |
CONSISTENCY, "bad beam count in hdkillbeam"); |
769 |
return(nchanged); |
770 |
} |
771 |
DCHECK(i < 1 | i > nbeams(hp), CONSISTENCY, |
772 |
"bad beam index to hdkillbeam"); |
773 |
DCHECK(!hdfragl[hp->fd].writable, CONSISTENCY, |
774 |
"hdkillbeam called on read-only holodeck"); |
775 |
if (hp->bl[i] != NULL) { /* free memory */ |
776 |
blglob(hp)->nrm -= nchanged = hp->bl[i]->nrm; |
777 |
free((void *)hp->bl[i]); |
778 |
hp->bl[i] = NULL; |
779 |
} else |
780 |
nchanged = hp->bi[i].nrd; |
781 |
if (hp->bi[i].nrd && !(hdfragflags&FF_KILL && hdfreefrag(hp,i))) { |
782 |
biglob(hp)->nrd -= hp->bi[i].nrd; /* free failed */ |
783 |
hp->bi[i].nrd = 0; |
784 |
hp->bi[i].fo = 0L; |
785 |
hdmarkdirty(hp, i); |
786 |
} |
787 |
return(nchanged); |
788 |
} |
789 |
|
790 |
|
791 |
int |
792 |
hdlrulist(hb, nents, n, hp) /* add beams from holodeck to LRU list */ |
793 |
register HDBEAMI *hb; /* beam list */ |
794 |
int nents; /* current list length */ |
795 |
int n; /* maximum list length */ |
796 |
register HOLO *hp; /* section we're adding from */ |
797 |
{ |
798 |
register int i, j; |
799 |
/* insert each beam from hp */ |
800 |
for (i = 1; i <= nbeams(hp); i++) { |
801 |
if (hp->bl[i] == NULL) /* check if loaded */ |
802 |
continue; |
803 |
#if 0 |
804 |
if (hp->bl[i]->tick == hdclock) /* preempt swap? */ |
805 |
continue; |
806 |
#endif |
807 |
if ((j = ++nents) >= n) /* grow list if we can */ |
808 |
nents--; |
809 |
for ( ; ; ) { /* bubble into place */ |
810 |
if (!--j || hp->bl[i]->tick >= |
811 |
hb[j-1].h->bl[hb[j-1].b]->tick) { |
812 |
hb[j].h = hp; |
813 |
hb[j].b = i; |
814 |
break; |
815 |
} |
816 |
copystruct(hb+j, hb+(j-1)); |
817 |
} |
818 |
} |
819 |
return(nents); /* return new list length */ |
820 |
} |
821 |
|
822 |
|
823 |
int |
824 |
hdfreecache(pct, honly) /* free up cache space, writing changes */ |
825 |
int pct; /* maximum percentage to free */ |
826 |
register HOLO *honly; /* NULL means check all */ |
827 |
{ |
828 |
HDBEAMI hb[FREEBEAMS]; |
829 |
int freetarget; |
830 |
int n; |
831 |
register int i; |
832 |
#ifdef DEBUG |
833 |
unsigned membefore; |
834 |
|
835 |
membefore = hdmemuse(0); |
836 |
#endif |
837 |
/* compute free target */ |
838 |
freetarget = (honly != NULL) ? blglob(honly)->nrm : |
839 |
hdmemuse(0)/sizeof(RAYVAL) ; |
840 |
freetarget = freetarget*pct/100; |
841 |
if (freetarget <= 0) |
842 |
return(0); |
843 |
/* find least recently used */ |
844 |
n = 0; |
845 |
if (honly != NULL) |
846 |
n = hdlrulist(hb, n, FREEBEAMS, honly); |
847 |
else |
848 |
for (i = 0; hdlist[i] != NULL; i++) |
849 |
n = hdlrulist(hb, n, FREEBEAMS, hdlist[i]); |
850 |
/* free LRU beams */ |
851 |
for (i = 0; i < n; i++) { |
852 |
hdfreebeam(hb[i].h, hb[i].b); |
853 |
if ((freetarget -= hb[i].h->bi[hb[i].b].nrd) <= 0) |
854 |
break; |
855 |
} |
856 |
hdsync(honly, 0); /* synchronize directories as necessary */ |
857 |
#ifdef DEBUG |
858 |
sprintf(errmsg, |
859 |
"%dK before, %dK after hdfreecache (%dK total), %d rays short\n", |
860 |
membefore>>10, hdmemuse(0)>>10, hdmemuse(1)>>10, freetarget); |
861 |
wputs(errmsg); |
862 |
#endif |
863 |
return(-freetarget); /* return how far past goal we went */ |
864 |
} |
865 |
|
866 |
|
867 |
hddone(hp) /* clean up holodeck section and free */ |
868 |
register HOLO *hp; /* NULL means clean up all */ |
869 |
{ |
870 |
register int i; |
871 |
|
872 |
if (hp == NULL) { /* NULL means clean up everything */ |
873 |
while (hdlist[0] != NULL) |
874 |
hddone(hdlist[0]); |
875 |
free((void *)hdfragl); |
876 |
hdfragl = NULL; nhdfragls = 0; |
877 |
return; |
878 |
} |
879 |
/* flush all data and free memory */ |
880 |
hdflush(hp); |
881 |
/* release fragment resources */ |
882 |
hdrelease(hp->fd); |
883 |
/* remove hp from active list */ |
884 |
for (i = 0; hdlist[i] != NULL; i++) |
885 |
if (hdlist[i] == hp) { |
886 |
while ((hdlist[i] = hdlist[i+1]) != NULL) |
887 |
i++; |
888 |
break; |
889 |
} |
890 |
free((void *)hp->bl); /* free beam list */ |
891 |
free((void *)hp); /* free holodeck struct */ |
892 |
} |