1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id: holofile.c,v 3.51 2003/07/21 22:30:18 schorsch Exp $"; |
3 |
#endif |
4 |
/* |
5 |
* Routines for managing holodeck files |
6 |
* |
7 |
* 9/30/97 GWLarson |
8 |
*/ |
9 |
|
10 |
#include "copyright.h" |
11 |
|
12 |
#include <string.h> |
13 |
|
14 |
#include "holo.h" |
15 |
|
16 |
#ifndef CACHESIZE |
17 |
#ifdef SMLMEM |
18 |
#define CACHESIZE 5 |
19 |
#else |
20 |
#define CACHESIZE 17 /* default cache size (Mbytes, 0==inf) */ |
21 |
#endif |
22 |
#endif |
23 |
#ifndef FREEBEAMS |
24 |
#define FREEBEAMS 1500 /* maximum beams to free at a time */ |
25 |
#endif |
26 |
#ifndef PCTFREE |
27 |
#define PCTFREE 15 /* maximum fraction to free (%) */ |
28 |
#endif |
29 |
#ifndef MAXFRAGB |
30 |
#define MAXFRAGB 16 /* fragment blocks/file to track (0==inf) */ |
31 |
#endif |
32 |
#ifndef FF_DEFAULT |
33 |
/* when to free a beam fragment */ |
34 |
#define FF_DEFAULT (FF_WRITE|FF_KILL) |
35 |
#endif |
36 |
#ifndef MINDIRSEL |
37 |
/* minimum directory seek length */ |
38 |
#define MINDIRSEL (4*BUFSIZ/sizeof(BEAMI)) |
39 |
#endif |
40 |
|
41 |
#ifndef BSD |
42 |
#define write writebuf /* safe i/o routines */ |
43 |
#define read readbuf |
44 |
#endif |
45 |
|
46 |
#define FRAGBLK 512 /* number of fragments to allocate at a time */ |
47 |
|
48 |
int hdfragflags = FF_DEFAULT; /* tells when to free fragments */ |
49 |
unsigned hdcachesize = CACHESIZE*1024*1024; /* target cache size */ |
50 |
unsigned long hdclock; /* clock value */ |
51 |
|
52 |
HOLO *hdlist[HDMAX+1]; /* holodeck pointers (NULL term.) */ |
53 |
|
54 |
static struct fraglist { |
55 |
short nlinks; /* number of holodeck sections using us */ |
56 |
short writable; /* 0 read-only, <0 write error encountered */ |
57 |
int nfrags; /* number of known fragments */ |
58 |
BEAMI *fi; /* fragments, descending file position */ |
59 |
off_t flen; /* last known file length */ |
60 |
} *hdfragl; /* fragment lists, indexed by file descriptor */ |
61 |
|
62 |
static int nhdfragls; /* size of hdfragl array */ |
63 |
|
64 |
|
65 |
HOLO * |
66 |
hdalloc(hproto) /* allocate and set holodeck section based on grid */ |
67 |
HDGRID *hproto; |
68 |
{ |
69 |
HOLO hdhead; |
70 |
register HOLO *hp; |
71 |
int n; |
72 |
/* copy grid to temporary header */ |
73 |
memcpy((void *)&hdhead, (void *)hproto, sizeof(HDGRID)); |
74 |
/* compute grid vectors and sizes */ |
75 |
hdcompgrid(&hdhead); |
76 |
/* allocate header with directory */ |
77 |
n = sizeof(HOLO)+nbeams(&hdhead)*sizeof(BEAMI); |
78 |
if ((hp = (HOLO *)malloc(n)) == NULL) |
79 |
return(NULL); |
80 |
/* copy header information */ |
81 |
*hp = hdhead; |
82 |
/* allocate and clear beam list */ |
83 |
hp->bl = (BEAM **)malloc((nbeams(hp)+1)*sizeof(BEAM *)+sizeof(BEAM)); |
84 |
if (hp->bl == NULL) { |
85 |
free((void *)hp); |
86 |
return(NULL); |
87 |
} |
88 |
memset((void *)hp->bl, '\0', (nbeams(hp)+1)*sizeof(BEAM *)+sizeof(BEAM)); |
89 |
hp->bl[0] = (BEAM *)(hp->bl+nbeams(hp)+1); /* set blglob(hp) */ |
90 |
hp->fd = -1; |
91 |
hp->dirty = 0; |
92 |
hp->priv = NULL; |
93 |
/* clear beam directory */ |
94 |
memset((void *)hp->bi, '\0', (nbeams(hp)+1)*sizeof(BEAMI)); |
95 |
return(hp); /* all is well */ |
96 |
} |
97 |
|
98 |
|
99 |
char * |
100 |
hdrealloc(ptr, siz, rout) /* (re)allocate memory, retry then error */ |
101 |
char *ptr; |
102 |
unsigned siz; |
103 |
char *rout; |
104 |
{ |
105 |
register char *newp; |
106 |
/* call malloc/realloc */ |
107 |
if (ptr == NULL) newp = (char *)malloc(siz); |
108 |
else newp = (char *)realloc((void *)ptr, siz); |
109 |
/* check success */ |
110 |
if (newp == NULL && rout != NULL) { |
111 |
hdfreecache(25, NULL); /* free some memory */ |
112 |
errno = 0; /* retry */ |
113 |
newp = hdrealloc(ptr, siz, NULL); |
114 |
if (newp == NULL) { /* give up and report error */ |
115 |
sprintf(errmsg, "out of memory in %s", rout); |
116 |
error(SYSTEM, errmsg); |
117 |
} |
118 |
} |
119 |
return(newp); |
120 |
} |
121 |
|
122 |
|
123 |
hdattach(fd, wr) /* start tracking file fragments for some section */ |
124 |
register int fd; |
125 |
int wr; |
126 |
{ |
127 |
if (fd >= nhdfragls) { |
128 |
hdfragl = (struct fraglist *)hdrealloc((char *)hdfragl, |
129 |
(fd+1)*sizeof(struct fraglist), "hdattach"); |
130 |
memset((void *)(hdfragl+nhdfragls), |
131 |
'\0', (fd+1-nhdfragls)*sizeof(struct fraglist)); |
132 |
nhdfragls = fd+1; |
133 |
} |
134 |
hdfragl[fd].nlinks++; |
135 |
hdfragl[fd].writable = wr; /* set writable flag */ |
136 |
hdfragl[fd].flen = lseek(fd, (off_t)0, 2); /* get file length */ |
137 |
} |
138 |
|
139 |
|
140 |
/* Do we need a routine to locate file fragments given known occupants? */ |
141 |
|
142 |
|
143 |
hdrelease(fd) /* stop tracking file fragments for some section */ |
144 |
register int fd; |
145 |
{ |
146 |
if ((fd < 0) | (fd >= nhdfragls) || !hdfragl[fd].nlinks) |
147 |
return; |
148 |
if (!--hdfragl[fd].nlinks && hdfragl[fd].nfrags) { |
149 |
free((void *)hdfragl[fd].fi); |
150 |
hdfragl[fd].fi = NULL; |
151 |
hdfragl[fd].nfrags = 0; |
152 |
} |
153 |
} |
154 |
|
155 |
|
156 |
HOLO * |
157 |
hdinit(fd, hproto) /* initialize a holodeck section in a file */ |
158 |
int fd; /* corresponding file descriptor */ |
159 |
HDGRID *hproto; /* holodeck section grid */ |
160 |
{ |
161 |
off_t rtrunc; |
162 |
off_t fpos; |
163 |
int writable; |
164 |
register HOLO *hp; |
165 |
register int n; |
166 |
/* prepare for system errors */ |
167 |
errno = 0; |
168 |
if ((fpos = lseek(fd, (off_t)0, 1)) < 0) |
169 |
error(SYSTEM, "cannot determine holodeck file position"); |
170 |
if (hproto == NULL) { /* assume we're loading it */ |
171 |
HDGRID hpr; |
172 |
/* load header */ |
173 |
if (read(fd, (char *)&hpr, sizeof(HDGRID)) != sizeof(HDGRID)) |
174 |
error(SYSTEM, "cannot load holodeck header"); |
175 |
/* allocate grid */ |
176 |
if ((hp = hdalloc(&hpr)) == NULL) |
177 |
goto memerr; |
178 |
/* load beam directory */ |
179 |
n = nbeams(hp)*sizeof(BEAMI); |
180 |
if (read(fd, (char *)(hp->bi+1), n) != n) |
181 |
error(SYSTEM, "failure loading holodeck directory"); |
182 |
/* check that it's clean */ |
183 |
for (n = nbeams(hp); n > 0; n--) |
184 |
if (hp->bi[n].fo < 0) { |
185 |
hp->bi[n].fo = 0; |
186 |
error(WARNING, "dirty holodeck section"); |
187 |
break; |
188 |
} |
189 |
/* check writability */ |
190 |
if (fd < nhdfragls && hdfragl[fd].nlinks) |
191 |
writable = hdfragl[fd].writable; |
192 |
else |
193 |
writable = lseek(fd, fpos, 0) == fpos && |
194 |
write(fd, (char *)hp, sizeof(HDGRID)) == |
195 |
sizeof(HDGRID); |
196 |
} else { /* else assume we're creating it */ |
197 |
if ((hp = hdalloc(hproto)) == NULL) |
198 |
goto memerr; |
199 |
/* write header and skeleton */ |
200 |
n = nbeams(hp)*sizeof(BEAMI); |
201 |
if (write(fd, (char *)hproto, sizeof(HDGRID)) != |
202 |
sizeof(HDGRID) || |
203 |
write(fd, (char *)(hp->bi+1), n) != n) |
204 |
error(SYSTEM, "cannot write header to holodeck file"); |
205 |
writable = 1; |
206 |
} |
207 |
hp->fd = fd; |
208 |
hp->dirty = 0; |
209 |
biglob(hp)->fo = fpos + sizeof(HDGRID); |
210 |
/* start tracking fragments */ |
211 |
hdattach(fd, writable); |
212 |
/* check rays on disk */ |
213 |
fpos = hdfilen(fd); |
214 |
biglob(hp)->nrd = rtrunc = 0; |
215 |
for (n = hproto == NULL ? nbeams(hp) : 0; n > 0; n--) |
216 |
if (hp->bi[n].nrd) { |
217 |
if (hp->bi[n].fo+hp->bi[n].nrd*sizeof(RAYVAL) > fpos) { |
218 |
rtrunc += hp->bi[n].nrd; |
219 |
hp->bi[n].nrd = 0; |
220 |
} else |
221 |
biglob(hp)->nrd += hp->bi[n].nrd; |
222 |
} |
223 |
if (rtrunc) { |
224 |
sprintf(errmsg, "truncated section, %ld rays lost (%.1f%%)", |
225 |
rtrunc, 100.*rtrunc/(rtrunc+biglob(hp)->nrd)); |
226 |
error(WARNING, errmsg); |
227 |
} |
228 |
/* add to holodeck list */ |
229 |
for (n = 0; n < HDMAX; n++) |
230 |
if (hdlist[n] == NULL) { |
231 |
hdlist[n] = hp; |
232 |
break; |
233 |
} |
234 |
/* all done */ |
235 |
return(hp); |
236 |
memerr: |
237 |
error(SYSTEM, "cannot allocate holodeck grid"); |
238 |
} |
239 |
|
240 |
|
241 |
hdmarkdirty(hp, i) /* mark holodeck directory position dirty */ |
242 |
register HOLO *hp; |
243 |
int i; |
244 |
{ |
245 |
static BEAMI smudge = {0, -1}; |
246 |
int mindist, minpos; |
247 |
register int j; |
248 |
|
249 |
if (!hp->dirty++) { /* write smudge first time */ |
250 |
if (lseek(hp->fd, biglob(hp)->fo+(i-1)*sizeof(BEAMI), 0) < 0 |
251 |
|| write(hp->fd, (char *)&smudge, |
252 |
sizeof(BEAMI)) != sizeof(BEAMI)) |
253 |
error(SYSTEM, "seek/write error in hdmarkdirty"); |
254 |
hp->dirseg[0].s = i; |
255 |
hp->dirseg[0].n = 1; |
256 |
return; |
257 |
} |
258 |
/* insert into segment list */ |
259 |
for (j = hp->dirty; j--; ) { |
260 |
if (!j || hp->dirseg[j-1].s < i) { |
261 |
hp->dirseg[j].s = i; |
262 |
hp->dirseg[j].n = 1; |
263 |
break; |
264 |
} |
265 |
*(hp->dirseg+j) = *(hp->dirseg+(j-1)); |
266 |
} |
267 |
do { /* check neighbors */ |
268 |
mindist = nbeams(hp); /* find closest */ |
269 |
for (j = hp->dirty; --j; ) |
270 |
if (hp->dirseg[j].s - |
271 |
(hp->dirseg[j-1].s + hp->dirseg[j-1].n) |
272 |
< mindist) { |
273 |
minpos = j; |
274 |
mindist = hp->dirseg[j].s - |
275 |
(hp->dirseg[j-1].s + hp->dirseg[j-1].n); |
276 |
} |
277 |
/* good enough? */ |
278 |
if (hp->dirty <= MAXDIRSE && mindist > MINDIRSEL) |
279 |
break; |
280 |
j = minpos - 1; /* coalesce neighbors */ |
281 |
if (hp->dirseg[j].s + hp->dirseg[j].n < |
282 |
hp->dirseg[minpos].s + hp->dirseg[minpos].n) |
283 |
hp->dirseg[j].n = hp->dirseg[minpos].s + |
284 |
hp->dirseg[minpos].n - hp->dirseg[j].s; |
285 |
hp->dirty--; |
286 |
while (++j < hp->dirty) /* close the gap */ |
287 |
*(hp->dirseg+j) = *(hp->dirseg+(j+1)); |
288 |
} while (mindist <= MINDIRSEL); |
289 |
} |
290 |
|
291 |
|
292 |
int |
293 |
hdsync(hp, all) /* update beams and directory on disk */ |
294 |
register HOLO *hp; |
295 |
int all; |
296 |
{ |
297 |
register int j, n; |
298 |
|
299 |
if (hp == NULL) { /* do all holodecks */ |
300 |
n = 0; |
301 |
for (j = 0; hdlist[j] != NULL; j++) |
302 |
n += hdsync(hdlist[j], all); |
303 |
return(n); |
304 |
} |
305 |
/* sync the beams */ |
306 |
for (j = (all ? nbeams(hp) : 0); j > 0; j--) |
307 |
if (hp->bl[j] != NULL) |
308 |
hdsyncbeam(hp, j); |
309 |
if (!hp->dirty) /* directory clean? */ |
310 |
return(0); |
311 |
errno = 0; /* write dirty segments */ |
312 |
for (j = 0; j < hp->dirty; j++) { |
313 |
if (lseek(hp->fd, biglob(hp)->fo + |
314 |
(hp->dirseg[j].s-1)*sizeof(BEAMI), 0) < 0) |
315 |
error(SYSTEM, "cannot seek on holodeck file"); |
316 |
n = hp->dirseg[j].n * sizeof(BEAMI); |
317 |
if (write(hp->fd, (char *)(hp->bi+hp->dirseg[j].s), n) != n) |
318 |
error(SYSTEM, "cannot update section directory"); |
319 |
} |
320 |
hp->dirty = 0; /* all clean */ |
321 |
return(1); |
322 |
} |
323 |
|
324 |
|
325 |
unsigned |
326 |
hdmemuse(all) /* return memory usage (in bytes) */ |
327 |
int all; /* include overhead (painful) */ |
328 |
{ |
329 |
long total = 0; |
330 |
register int i, j; |
331 |
|
332 |
for (j = 0; hdlist[j] != NULL; j++) { |
333 |
total += blglob(hdlist[j])->nrm * sizeof(RAYVAL); |
334 |
if (all) { |
335 |
total += sizeof(HOLO) + sizeof(BEAM *) + |
336 |
nbeams(hdlist[j]) * |
337 |
(sizeof(BEAM *)+sizeof(BEAMI)); |
338 |
for (i = nbeams(hdlist[j]); i > 0; i--) |
339 |
if (hdlist[j]->bl[i] != NULL) |
340 |
total += sizeof(BEAM); |
341 |
} |
342 |
} |
343 |
if (all) |
344 |
for (j = 0; j < nhdfragls; j++) { |
345 |
total += sizeof(struct fraglist); |
346 |
if (hdfragl[j].nfrags) |
347 |
total += FRAGBLK*sizeof(BEAMI) * |
348 |
((hdfragl[j].nfrags-1)/FRAGBLK + 1) ; |
349 |
} |
350 |
return(total); |
351 |
} |
352 |
|
353 |
|
354 |
off_t |
355 |
hdfilen(fd) /* return file length for fd */ |
356 |
int fd; |
357 |
{ |
358 |
off_t fpos, flen; |
359 |
|
360 |
if (fd < 0) |
361 |
return(-1); |
362 |
if (fd >= nhdfragls || !hdfragl[fd].nlinks) { |
363 |
if ((fpos = lseek(fd, (off_t)0, 1)) < 0) |
364 |
return(-1); |
365 |
flen = lseek(fd, (off_t)0, 2); |
366 |
lseek(fd, fpos, 0); |
367 |
return(flen); |
368 |
} |
369 |
return(hdfragl[fd].flen); |
370 |
} |
371 |
|
372 |
|
373 |
off_t |
374 |
hdfiluse(fd, all) /* compute file usage (in bytes) */ |
375 |
int fd; /* open file descriptor to check */ |
376 |
int all; /* include overhead and unflushed data */ |
377 |
{ |
378 |
off_t total = 0; |
379 |
register int i, j; |
380 |
|
381 |
for (j = 0; hdlist[j] != NULL; j++) { |
382 |
if (hdlist[j]->fd != fd) |
383 |
continue; |
384 |
total += biglob(hdlist[j])->nrd * sizeof(RAYVAL); |
385 |
if (all) { |
386 |
for (i = nbeams(hdlist[j]); i > 0; i--) |
387 |
if (hdlist[j]->bl[i] != NULL) |
388 |
total += sizeof(RAYVAL) * |
389 |
(hdlist[j]->bl[i]->nrm - |
390 |
hdlist[j]->bi[i].nrd); |
391 |
total += sizeof(HDGRID) + |
392 |
nbeams(hdlist[j])*sizeof(BEAMI); |
393 |
} |
394 |
} |
395 |
return(total); /* does not include fragments */ |
396 |
} |
397 |
|
398 |
|
399 |
RAYVAL * |
400 |
hdnewrays(hp, i, nr) /* allocate space for add'l rays and return pointer */ |
401 |
register HOLO *hp; |
402 |
register int i; |
403 |
int nr; /* number of new rays desired */ |
404 |
{ |
405 |
RAYVAL *p; |
406 |
int n; |
407 |
|
408 |
if (nr <= 0) return(NULL); |
409 |
CHECK((i < 1) | (i > nbeams(hp)), |
410 |
CONSISTENCY, "bad beam index given to hdnewrays"); |
411 |
if (hp->bl[i] != NULL) |
412 |
hp->bl[i]->tick = hdclock; /* preempt swap */ |
413 |
if (hdcachesize > 0 && hdmemuse(0) >= hdcachesize) |
414 |
hdfreecache(PCTFREE, NULL); /* free some space */ |
415 |
if (hp->bl[i] == NULL) { /* allocate (and load) */ |
416 |
n = hp->bi[i].nrd + nr; |
417 |
hp->bl[i] = (BEAM *)hdrealloc(NULL, hdbsiz(n), "hdnewrays"); |
418 |
blglob(hp)->nrm += n; |
419 |
if ((n = hp->bl[i]->nrm = hp->bi[i].nrd)) { |
420 |
errno = 0; |
421 |
if (lseek(hp->fd, hp->bi[i].fo, 0) < 0) |
422 |
error(SYSTEM, "seek error on holodeck file"); |
423 |
n *= sizeof(RAYVAL); |
424 |
if (read(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) |
425 |
error(SYSTEM, |
426 |
"error reading beam from holodeck file"); |
427 |
} |
428 |
} else { /* just grow in memory */ |
429 |
hp->bl[i] = (BEAM *)hdrealloc((char *)hp->bl[i], |
430 |
hdbsiz(hp->bl[i]->nrm + nr), "hdnewrays"); |
431 |
blglob(hp)->nrm += nr; |
432 |
} |
433 |
if (hdfragflags&FF_ALLOC && hp->bi[i].nrd) |
434 |
hdfreefrag(hp, i); /* relinquish old fragment */ |
435 |
p = hdbray(hp->bl[i]) + hp->bl[i]->nrm; |
436 |
hp->bl[i]->nrm += nr; /* update in-core structure */ |
437 |
memset((void *)p, '\0', nr*sizeof(RAYVAL)); |
438 |
blglob(hp)->tick = hp->bl[i]->tick = hdclock++; /* update LRU clock */ |
439 |
return(p); /* point to new rays */ |
440 |
} |
441 |
|
442 |
|
443 |
BEAM * |
444 |
hdgetbeam(hp, i) /* get beam (from file if necessary) */ |
445 |
register HOLO *hp; |
446 |
register int i; |
447 |
{ |
448 |
register int n; |
449 |
|
450 |
CHECK((i < 1) | (i > nbeams(hp)), |
451 |
CONSISTENCY, "bad beam index given to hdgetbeam"); |
452 |
if (hp->bl[i] == NULL) { /* load from disk */ |
453 |
if (!(n = hp->bi[i].nrd)) |
454 |
return(NULL); |
455 |
if (hdcachesize > 0 && hdmemuse(0) >= hdcachesize) |
456 |
hdfreecache(PCTFREE, NULL); /* get free space */ |
457 |
hp->bl[i] = (BEAM *)hdrealloc(NULL, hdbsiz(n), "hdgetbeam"); |
458 |
blglob(hp)->nrm += hp->bl[i]->nrm = n; |
459 |
errno = 0; |
460 |
if (lseek(hp->fd, hp->bi[i].fo, 0) < 0) |
461 |
error(SYSTEM, "seek error on holodeck file"); |
462 |
n *= sizeof(RAYVAL); |
463 |
if (read(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) |
464 |
error(SYSTEM, "error reading beam from holodeck file"); |
465 |
if (hdfragflags&FF_READ) |
466 |
hdfreefrag(hp, i); /* relinquish old frag. */ |
467 |
} |
468 |
blglob(hp)->tick = hp->bl[i]->tick = hdclock++; /* update LRU clock */ |
469 |
return(hp->bl[i]); |
470 |
} |
471 |
|
472 |
|
473 |
int |
474 |
hdfilord(hb1, hb2) /* order beams for quick loading */ |
475 |
register HDBEAMI *hb1, *hb2; |
476 |
{ |
477 |
register off_t c; |
478 |
/* residents go first */ |
479 |
if (hb2->h->bl[hb2->b] != NULL) |
480 |
return(hb1->h->bl[hb1->b] == NULL); |
481 |
if (hb1->h->bl[hb1->b] != NULL) |
482 |
return(-1); |
483 |
/* otherwise sort by file descriptor */ |
484 |
if (hb1->h->fd != hb2->h->fd) |
485 |
return(hb1->h->fd - hb2->h->fd); |
486 |
/* then by position in file */ |
487 |
c = hb1->h->bi[hb1->b].fo - hb2->h->bi[hb2->b].fo; |
488 |
return(c > 0 ? 1 : c < 0 ? -1 : 0); |
489 |
} |
490 |
|
491 |
|
492 |
hdloadbeams(hb, n, bf) /* load a list of beams in optimal order */ |
493 |
register HDBEAMI *hb; /* list gets sorted by hdfilord() */ |
494 |
int n; /* list length */ |
495 |
void (*bf)(); /* callback function (optional) */ |
496 |
{ |
497 |
unsigned origcachesize, memuse; |
498 |
int bytesloaded, needbytes, bytes2free; |
499 |
register BEAM *bp; |
500 |
register int i; |
501 |
/* precheck consistency */ |
502 |
if (n <= 0) return; |
503 |
for (i = n; i--; ) |
504 |
if (hb[i].h==NULL || (hb[i].b<1) | (hb[i].b>nbeams(hb[i].h))) |
505 |
error(CONSISTENCY, "bad beam in hdloadbeams"); |
506 |
/* sort list for optimal access */ |
507 |
qsort((void *)hb, n, sizeof(HDBEAMI), hdfilord); |
508 |
bytesloaded = 0; /* run through loaded beams */ |
509 |
for ( ; n && (bp = hb->h->bl[hb->b]) != NULL; n--, hb++) { |
510 |
bp->tick = hdclock; /* preempt swap */ |
511 |
bytesloaded += bp->nrm; |
512 |
if (bf != NULL) |
513 |
(*bf)(bp, hb); |
514 |
} |
515 |
bytesloaded *= sizeof(RAYVAL); |
516 |
if ((origcachesize = hdcachesize) > 0) { |
517 |
needbytes = 0; /* figure out memory needs */ |
518 |
for (i = n; i--; ) |
519 |
needbytes += hb[i].h->bi[hb[i].b].nrd; |
520 |
needbytes *= sizeof(RAYVAL); |
521 |
do { /* free enough memory */ |
522 |
memuse = hdmemuse(0); |
523 |
bytes2free = needbytes - (int)(hdcachesize-memuse); |
524 |
if (bytes2free > (int)(memuse - bytesloaded)) |
525 |
bytes2free = memuse - bytesloaded; |
526 |
} while (bytes2free > 0 && |
527 |
hdfreecache(100*bytes2free/memuse, NULL) < 0); |
528 |
hdcachesize = 0; /* load beams w/o swap */ |
529 |
} |
530 |
for (i = 0; i < n; i++) |
531 |
if ((bp = hdgetbeam(hb[i].h, hb[i].b)) != NULL && bf != NULL) |
532 |
(*bf)(bp, hb+i); |
533 |
hdcachesize = origcachesize; /* resume dynamic swapping */ |
534 |
} |
535 |
|
536 |
|
537 |
int |
538 |
hdfreefrag(hp, i) /* free a file fragment */ |
539 |
HOLO *hp; |
540 |
int i; |
541 |
{ |
542 |
register BEAMI *bi = &hp->bi[i]; |
543 |
register struct fraglist *f; |
544 |
register int j, k; |
545 |
|
546 |
if (bi->nrd <= 0) |
547 |
return(0); |
548 |
DCHECK(hp->fd < 0 | hp->fd >= nhdfragls || !hdfragl[hp->fd].nlinks, |
549 |
CONSISTENCY, "bad file descriptor in hdfreefrag"); |
550 |
f = &hdfragl[hp->fd]; |
551 |
if (!f->writable) |
552 |
return(0); |
553 |
if (f->nfrags % FRAGBLK == 0) { /* delete empty remnants */ |
554 |
for (j = k = 0; k < f->nfrags; j++, k++) { |
555 |
while (f->fi[k].nrd == 0) |
556 |
if (++k >= f->nfrags) |
557 |
goto endloop; |
558 |
if (k > j) |
559 |
*(f->fi+j) = *(f->fi+k); |
560 |
} |
561 |
endloop: |
562 |
f->nfrags = j; |
563 |
} |
564 |
j = f->nfrags++; /* allocate a slot in free list */ |
565 |
#if MAXFRAGB |
566 |
if (j >= MAXFRAGB*FRAGBLK) { |
567 |
f->nfrags = j--; /* stop list growth */ |
568 |
if (bi->nrd <= f->fi[j].nrd) |
569 |
return(0); /* new one no better than discard */ |
570 |
} |
571 |
#endif |
572 |
if (j % FRAGBLK == 0) { /* more (or less) free list space */ |
573 |
register BEAMI *newp; |
574 |
if (f->fi == NULL) |
575 |
newp = (BEAMI *)malloc((j+FRAGBLK)*sizeof(BEAMI)); |
576 |
else |
577 |
newp = (BEAMI *)realloc((void *)f->fi, |
578 |
(j+FRAGBLK)*sizeof(BEAMI)); |
579 |
if (newp == NULL) { |
580 |
f->nfrags--; /* graceful failure */ |
581 |
return(0); |
582 |
} |
583 |
f->fi = newp; |
584 |
} |
585 |
for ( ; ; j--) { /* insert in descending list */ |
586 |
if (!j || bi->fo < f->fi[j-1].fo) { |
587 |
f->fi[j].fo = bi->fo; |
588 |
f->fi[j].nrd = bi->nrd; |
589 |
break; |
590 |
} |
591 |
*(f->fi+j) = *(f->fi+(j-1)); |
592 |
} |
593 |
/* coalesce adjacent fragments */ |
594 |
/* successors never empty */ |
595 |
if (j && f->fi[j-1].fo == f->fi[j].fo + f->fi[j].nrd*sizeof(RAYVAL)) { |
596 |
f->fi[j].nrd += f->fi[j-1].nrd; |
597 |
f->fi[j-1].nrd = 0; |
598 |
} |
599 |
for (k = j+1; k < f->nfrags; k++) /* get non-empty predecessor */ |
600 |
if (f->fi[k].nrd) { |
601 |
if (f->fi[j].fo == f->fi[k].fo + |
602 |
f->fi[k].nrd*sizeof(RAYVAL)) { |
603 |
f->fi[k].nrd += f->fi[j].nrd; |
604 |
f->fi[j].nrd = 0; |
605 |
} |
606 |
break; |
607 |
} |
608 |
biglob(hp)->nrd -= bi->nrd; /* tell fragment it's free */ |
609 |
bi->nrd = 0; |
610 |
bi->fo = 0; |
611 |
hdmarkdirty(hp, i); /* assume we'll reallocate */ |
612 |
return(1); |
613 |
} |
614 |
|
615 |
|
616 |
int |
617 |
hdfragOK(fd, listlen, listsiz) /* get fragment list status for file */ |
618 |
int fd; |
619 |
int *listlen; |
620 |
register int32 *listsiz; |
621 |
{ |
622 |
register struct fraglist *f; |
623 |
register int i; |
624 |
|
625 |
if ((fd < 0) | (fd >= nhdfragls) || !(f = &hdfragl[fd])->nlinks) |
626 |
return(0); /* listless */ |
627 |
if (listlen != NULL) |
628 |
*listlen = f->nfrags; |
629 |
if (listsiz != NULL) |
630 |
for (i = f->nfrags, *listsiz = 0; i--; ) |
631 |
*listsiz += f->fi[i].nrd; |
632 |
#if MAXFRAGB |
633 |
return(f->nfrags < MAXFRAGB*FRAGBLK); |
634 |
#else |
635 |
return(1); /* list never fills up */ |
636 |
#endif |
637 |
} |
638 |
|
639 |
|
640 |
off_t |
641 |
hdallocfrag(fd, nrays) /* allocate a file fragment */ |
642 |
int fd; |
643 |
uint32 nrays; |
644 |
{ |
645 |
register struct fraglist *f; |
646 |
register int j; |
647 |
off_t nfo; |
648 |
|
649 |
if (nrays == 0) |
650 |
return(-1L); |
651 |
DCHECK(fd < 0 | fd >= nhdfragls || !hdfragl[fd].nlinks, |
652 |
CONSISTENCY, "bad file descriptor in hdallocfrag"); |
653 |
f = &hdfragl[fd]; |
654 |
for (j = f->nfrags; j-- > 0; ) /* first fit algorithm */ |
655 |
if (f->fi[j].nrd >= nrays) |
656 |
break; |
657 |
if (j < 0) { /* no fragment -- extend file */ |
658 |
nfo = f->flen; |
659 |
f->flen += nrays*sizeof(RAYVAL); |
660 |
} else { /* else use fragment */ |
661 |
nfo = f->fi[j].fo; |
662 |
f->fi[j].fo += nrays*sizeof(RAYVAL); |
663 |
f->fi[j].nrd -= nrays; |
664 |
} |
665 |
return(nfo); |
666 |
} |
667 |
|
668 |
|
669 |
int |
670 |
hdsyncbeam(hp, i) /* sync beam in memory with beam on disk */ |
671 |
register HOLO *hp; |
672 |
register int i; |
673 |
{ |
674 |
int fragfreed; |
675 |
uint32 nrays; |
676 |
unsigned int n; |
677 |
off_t nfo; |
678 |
/* check file status */ |
679 |
if (hdfragl[hp->fd].writable <= 0) |
680 |
return(hdfragl[hp->fd].writable); |
681 |
DCHECK(i < 1 | i > nbeams(hp), |
682 |
CONSISTENCY, "bad beam index in hdsyncbeam"); |
683 |
/* is current fragment OK? */ |
684 |
if (hp->bl[i] == NULL || (nrays = hp->bl[i]->nrm) == hp->bi[i].nrd) |
685 |
return(0); |
686 |
/* relinquish old fragment? */ |
687 |
fragfreed = hdfragflags&FF_WRITE && hp->bi[i].nrd && hdfreefrag(hp,i); |
688 |
if (nrays) { /* get and write new fragment */ |
689 |
nfo = hdallocfrag(hp->fd, nrays); |
690 |
errno = 0; |
691 |
if (lseek(hp->fd, nfo, 0) < 0) |
692 |
error(SYSTEM, "cannot seek on holodeck file"); |
693 |
n = hp->bl[i]->nrm * sizeof(RAYVAL); |
694 |
if (write(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) { |
695 |
hdfragl[hp->fd].writable = -1; |
696 |
hdsync(NULL, 0); /* sync directories */ |
697 |
error(SYSTEM, "write error in hdsyncbeam"); |
698 |
} |
699 |
hp->bi[i].fo = nfo; |
700 |
} else |
701 |
hp->bi[i].fo = 0; |
702 |
biglob(hp)->nrd += nrays - hp->bi[i].nrd; |
703 |
hp->bi[i].nrd = nrays; |
704 |
if (!fragfreed) |
705 |
hdmarkdirty(hp, i); /* need to flag dir. ent. */ |
706 |
return(1); |
707 |
} |
708 |
|
709 |
|
710 |
int |
711 |
hdfreebeam(hp, i) /* free beam, writing if dirty */ |
712 |
register HOLO *hp; |
713 |
register int i; |
714 |
{ |
715 |
int nchanged; |
716 |
|
717 |
if (hp == NULL) { /* clear all holodecks */ |
718 |
nchanged = 0; |
719 |
for (i = 0; hdlist[i] != NULL; i++) |
720 |
nchanged += hdfreebeam(hdlist[i], 0); |
721 |
return(nchanged); |
722 |
} |
723 |
if (hdfragl[hp->fd].writable < 0) /* check for file error */ |
724 |
return(0); |
725 |
if (i == 0) { /* clear entire holodeck */ |
726 |
if (blglob(hp)->nrm == 0) |
727 |
return(0); /* already clear */ |
728 |
nchanged = 0; |
729 |
for (i = nbeams(hp); i > 0; i--) |
730 |
if (hp->bl[i] != NULL) |
731 |
nchanged += hdfreebeam(hp, i); |
732 |
DCHECK(blglob(hp)->nrm != 0, |
733 |
CONSISTENCY, "bad beam count in hdfreebeam"); |
734 |
return(nchanged); |
735 |
} |
736 |
DCHECK(i < 1 | i > nbeams(hp), |
737 |
CONSISTENCY, "bad beam index to hdfreebeam"); |
738 |
if (hp->bl[i] == NULL) |
739 |
return(0); |
740 |
/* check for additions */ |
741 |
nchanged = hp->bl[i]->nrm - hp->bi[i].nrd; |
742 |
if (nchanged) |
743 |
hdsyncbeam(hp, i); /* write new fragment */ |
744 |
blglob(hp)->nrm -= hp->bl[i]->nrm; |
745 |
free((void *)hp->bl[i]); /* free memory */ |
746 |
hp->bl[i] = NULL; |
747 |
return(nchanged); |
748 |
} |
749 |
|
750 |
|
751 |
int |
752 |
hdkillbeam(hp, i) /* delete beam from holodeck */ |
753 |
register HOLO *hp; |
754 |
register int i; |
755 |
{ |
756 |
int nchanged; |
757 |
|
758 |
if (hp == NULL) { /* clobber all holodecks */ |
759 |
nchanged = 0; |
760 |
for (i = 0; hdlist[i] != NULL; i++) |
761 |
nchanged += hdkillbeam(hdlist[i], 0); |
762 |
return(nchanged); |
763 |
} |
764 |
if (i == 0) { /* clobber entire holodeck */ |
765 |
if ((biglob(hp)->nrd == 0) & (blglob(hp)->nrm == 0)) |
766 |
return(0); /* already empty */ |
767 |
nchanged = 0; |
768 |
nchanged = 0; |
769 |
for (i = nbeams(hp); i > 0; i--) |
770 |
if (hp->bi[i].nrd > 0 || hp->bl[i] != NULL) |
771 |
nchanged += hdkillbeam(hp, i); |
772 |
DCHECK(biglob(hp)->nrd != 0 | blglob(hp)->nrm != 0, |
773 |
CONSISTENCY, "bad beam count in hdkillbeam"); |
774 |
return(nchanged); |
775 |
} |
776 |
DCHECK(i < 1 | i > nbeams(hp), CONSISTENCY, |
777 |
"bad beam index to hdkillbeam"); |
778 |
DCHECK(!hdfragl[hp->fd].writable, CONSISTENCY, |
779 |
"hdkillbeam called on read-only holodeck"); |
780 |
if (hp->bl[i] != NULL) { /* free memory */ |
781 |
blglob(hp)->nrm -= nchanged = hp->bl[i]->nrm; |
782 |
free((void *)hp->bl[i]); |
783 |
hp->bl[i] = NULL; |
784 |
} else |
785 |
nchanged = hp->bi[i].nrd; |
786 |
if (hp->bi[i].nrd && !(hdfragflags&FF_KILL && hdfreefrag(hp,i))) { |
787 |
biglob(hp)->nrd -= hp->bi[i].nrd; /* free failed */ |
788 |
hp->bi[i].nrd = 0; |
789 |
hp->bi[i].fo = 0; |
790 |
hdmarkdirty(hp, i); |
791 |
} |
792 |
return(nchanged); |
793 |
} |
794 |
|
795 |
|
796 |
int |
797 |
hdlrulist(hb, nents, n, hp) /* add beams from holodeck to LRU list */ |
798 |
register HDBEAMI *hb; /* beam list */ |
799 |
int nents; /* current list length */ |
800 |
int n; /* maximum list length */ |
801 |
register HOLO *hp; /* section we're adding from */ |
802 |
{ |
803 |
register int i, j; |
804 |
/* insert each beam from hp */ |
805 |
for (i = 1; i <= nbeams(hp); i++) { |
806 |
if (hp->bl[i] == NULL) /* check if loaded */ |
807 |
continue; |
808 |
#if 0 |
809 |
if (hp->bl[i]->tick == hdclock) /* preempt swap? */ |
810 |
continue; |
811 |
#endif |
812 |
if ((j = ++nents) >= n) /* grow list if we can */ |
813 |
nents--; |
814 |
for ( ; ; ) { /* bubble into place */ |
815 |
if (!--j || hp->bl[i]->tick >= |
816 |
hb[j-1].h->bl[hb[j-1].b]->tick) { |
817 |
hb[j].h = hp; |
818 |
hb[j].b = i; |
819 |
break; |
820 |
} |
821 |
*(hb+j) = *(hb+(j-1)); |
822 |
} |
823 |
} |
824 |
return(nents); /* return new list length */ |
825 |
} |
826 |
|
827 |
|
828 |
int |
829 |
hdfreecache(pct, honly) /* free up cache space, writing changes */ |
830 |
int pct; /* maximum percentage to free */ |
831 |
register HOLO *honly; /* NULL means check all */ |
832 |
{ |
833 |
HDBEAMI hb[FREEBEAMS]; |
834 |
int freetarget; |
835 |
int n; |
836 |
register int i; |
837 |
#ifdef DEBUG |
838 |
unsigned membefore; |
839 |
|
840 |
membefore = hdmemuse(0); |
841 |
#endif |
842 |
/* compute free target */ |
843 |
freetarget = (honly != NULL) ? blglob(honly)->nrm : |
844 |
hdmemuse(0)/sizeof(RAYVAL) ; |
845 |
freetarget = freetarget*pct/100; |
846 |
if (freetarget <= 0) |
847 |
return(0); |
848 |
/* find least recently used */ |
849 |
n = 0; |
850 |
if (honly != NULL) |
851 |
n = hdlrulist(hb, n, FREEBEAMS, honly); |
852 |
else |
853 |
for (i = 0; hdlist[i] != NULL; i++) |
854 |
n = hdlrulist(hb, n, FREEBEAMS, hdlist[i]); |
855 |
/* free LRU beams */ |
856 |
for (i = 0; i < n; i++) { |
857 |
hdfreebeam(hb[i].h, hb[i].b); |
858 |
if ((freetarget -= hb[i].h->bi[hb[i].b].nrd) <= 0) |
859 |
break; |
860 |
} |
861 |
hdsync(honly, 0); /* synchronize directories as necessary */ |
862 |
#ifdef DEBUG |
863 |
sprintf(errmsg, |
864 |
"%dK before, %dK after hdfreecache (%dK total), %d rays short\n", |
865 |
membefore>>10, hdmemuse(0)>>10, hdmemuse(1)>>10, freetarget); |
866 |
wputs(errmsg); |
867 |
#endif |
868 |
return(-freetarget); /* return how far past goal we went */ |
869 |
} |
870 |
|
871 |
|
872 |
hddone(hp) /* clean up holodeck section and free */ |
873 |
register HOLO *hp; /* NULL means clean up all */ |
874 |
{ |
875 |
register int i; |
876 |
|
877 |
if (hp == NULL) { /* NULL means clean up everything */ |
878 |
while (hdlist[0] != NULL) |
879 |
hddone(hdlist[0]); |
880 |
free((void *)hdfragl); |
881 |
hdfragl = NULL; nhdfragls = 0; |
882 |
return; |
883 |
} |
884 |
/* flush all data and free memory */ |
885 |
hdflush(hp); |
886 |
/* release fragment resources */ |
887 |
hdrelease(hp->fd); |
888 |
/* remove hp from active list */ |
889 |
for (i = 0; hdlist[i] != NULL; i++) |
890 |
if (hdlist[i] == hp) { |
891 |
while ((hdlist[i] = hdlist[i+1]) != NULL) |
892 |
i++; |
893 |
break; |
894 |
} |
895 |
free((void *)hp->bl); /* free beam list */ |
896 |
free((void *)hp); /* free holodeck struct */ |
897 |
} |