1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id: holofile.c,v 3.58 2008/12/04 23:34:00 greg 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 "platform.h" |
15 |
#include "rtprocess.h" |
16 |
|
17 |
#include "holo.h" |
18 |
|
19 |
#ifndef CACHESIZE |
20 |
#ifdef SMLMEM |
21 |
#define CACHESIZE 10 |
22 |
#else |
23 |
#define CACHESIZE 100 /* default cache size (Mbytes, 0==inf) */ |
24 |
#endif |
25 |
#endif |
26 |
#ifndef FREEBEAMS |
27 |
#define FREEBEAMS 1500 /* maximum beams to free at a time */ |
28 |
#endif |
29 |
#ifndef PCTFREE |
30 |
#define PCTFREE 15 /* maximum fraction to free (%) */ |
31 |
#endif |
32 |
#ifndef MAXFRAGB |
33 |
#define MAXFRAGB 64 /* fragment blocks/file to track (0==inf) */ |
34 |
#endif |
35 |
#ifndef FF_DEFAULT |
36 |
/* when to free a beam fragment */ |
37 |
#define FF_DEFAULT (FF_WRITE|FF_KILL) |
38 |
#endif |
39 |
#ifndef MINDIRSEL |
40 |
/* minimum directory seek length */ |
41 |
#define MINDIRSEL (4*BUFSIZ/sizeof(BEAMI)) |
42 |
#endif |
43 |
|
44 |
#ifndef BSD |
45 |
#define write writebuf /* safe i/o routines */ |
46 |
#define read readbuf |
47 |
#endif |
48 |
|
49 |
#define FRAGBLK 512 /* number of fragments to allocate at a time */ |
50 |
|
51 |
int hdfragflags = FF_DEFAULT; /* tells when to free fragments */ |
52 |
unsigned hdcachesize = CACHESIZE*1024*1024; /* target cache size */ |
53 |
unsigned long hdclock; /* clock value */ |
54 |
|
55 |
HOLO *hdlist[HDMAX+1]; /* holodeck pointers (NULL term.) */ |
56 |
|
57 |
static struct fraglist { |
58 |
short nlinks; /* number of holodeck sections using us */ |
59 |
short writable; /* 0 read-only, <0 write error encountered */ |
60 |
int nfrags; /* number of known fragments */ |
61 |
BEAMI *fi; /* fragments, descending file position */ |
62 |
off_t flen; /* last known file length */ |
63 |
} *hdfragl; /* fragment lists, indexed by file descriptor */ |
64 |
|
65 |
static int nhdfragls; /* size of hdfragl array */ |
66 |
|
67 |
static HOLO *hdalloc(HDGRID *hproto); |
68 |
static char *hdrealloc(char *ptr, unsigned siz, char *rout); |
69 |
static void hdattach(int fd, int wr); |
70 |
static void hdrelease(int fd); |
71 |
static void hdmarkdirty(HOLO *hp, int i); |
72 |
static unsigned int hdmemuse(int all); |
73 |
static int hdfilord(const void *hb1, const void *hb2); |
74 |
static off_t hdallocfrag(int fd, uint32 nrays); |
75 |
static int hdsyncbeam(HOLO *hp, int i); |
76 |
static int hdlrulist(HDBEAMI *hb, int nents, int n, HOLO *hp); |
77 |
static int hdfreecache(int pct, HOLO *honly); |
78 |
|
79 |
|
80 |
|
81 |
HOLO * |
82 |
hdalloc( /* allocate and set holodeck section based on grid */ |
83 |
HDGRID *hproto |
84 |
) |
85 |
{ |
86 |
HOLO hdhead; |
87 |
register HOLO *hp; |
88 |
int n; |
89 |
/* copy grid to temporary header */ |
90 |
memcpy((void *)&hdhead, (void *)hproto, sizeof(HDGRID)); |
91 |
/* compute grid vectors and sizes */ |
92 |
hdcompgrid(&hdhead); |
93 |
/* allocate header with directory */ |
94 |
n = sizeof(HOLO)+nbeams(&hdhead)*sizeof(BEAMI); |
95 |
if ((hp = (HOLO *)malloc(n)) == NULL) |
96 |
return(NULL); |
97 |
/* copy header information */ |
98 |
*hp = hdhead; |
99 |
/* allocate and clear beam list */ |
100 |
hp->bl = (BEAM **)malloc((nbeams(hp)+1)*sizeof(BEAM *)+sizeof(BEAM)); |
101 |
if (hp->bl == NULL) { |
102 |
free((void *)hp); |
103 |
return(NULL); |
104 |
} |
105 |
memset((void *)hp->bl, '\0', (nbeams(hp)+1)*sizeof(BEAM *)+sizeof(BEAM)); |
106 |
hp->bl[0] = (BEAM *)(hp->bl+nbeams(hp)+1); /* set blglob(hp) */ |
107 |
hp->fd = -1; |
108 |
hp->dirty = 0; |
109 |
hp->priv = NULL; |
110 |
/* clear beam directory */ |
111 |
memset((void *)hp->bi, '\0', (nbeams(hp)+1)*sizeof(BEAMI)); |
112 |
return(hp); /* all is well */ |
113 |
} |
114 |
|
115 |
|
116 |
char * |
117 |
hdrealloc( /* (re)allocate memory, retry then error */ |
118 |
char *ptr, |
119 |
unsigned siz, |
120 |
char *rout |
121 |
) |
122 |
{ |
123 |
register char *newp; |
124 |
/* call malloc/realloc */ |
125 |
if (ptr == NULL) newp = (char *)malloc(siz); |
126 |
else newp = (char *)realloc((void *)ptr, siz); |
127 |
/* check success */ |
128 |
if (newp == NULL && rout != NULL) { |
129 |
hdfreecache(25, NULL); /* free some memory */ |
130 |
errno = 0; /* retry */ |
131 |
newp = hdrealloc(ptr, siz, NULL); |
132 |
if (newp == NULL) { /* give up and report error */ |
133 |
sprintf(errmsg, "out of memory in %s", rout); |
134 |
error(SYSTEM, errmsg); |
135 |
} |
136 |
} |
137 |
return(newp); |
138 |
} |
139 |
|
140 |
|
141 |
void |
142 |
hdattach( /* start tracking file fragments for some section */ |
143 |
register int fd, |
144 |
int wr |
145 |
) |
146 |
{ |
147 |
if (fd >= nhdfragls) { |
148 |
hdfragl = (struct fraglist *)hdrealloc((char *)hdfragl, |
149 |
(fd+1)*sizeof(struct fraglist), "hdattach"); |
150 |
memset((void *)(hdfragl+nhdfragls), |
151 |
'\0', (fd+1-nhdfragls)*sizeof(struct fraglist)); |
152 |
nhdfragls = fd+1; |
153 |
} |
154 |
hdfragl[fd].nlinks++; |
155 |
hdfragl[fd].writable = wr; /* set writable flag */ |
156 |
/* get file length */ |
157 |
hdfragl[fd].flen = lseek(fd, (off_t)0, SEEK_END); |
158 |
} |
159 |
|
160 |
|
161 |
/* Do we need a routine to locate file fragments given known occupants? */ |
162 |
|
163 |
|
164 |
void |
165 |
hdrelease( /* stop tracking file fragments for some section */ |
166 |
register int fd |
167 |
) |
168 |
{ |
169 |
if ((fd < 0) | (fd >= nhdfragls) || !hdfragl[fd].nlinks) |
170 |
return; |
171 |
if (!--hdfragl[fd].nlinks && hdfragl[fd].nfrags) { |
172 |
free((void *)hdfragl[fd].fi); |
173 |
hdfragl[fd].fi = NULL; |
174 |
hdfragl[fd].nfrags = 0; |
175 |
} |
176 |
} |
177 |
|
178 |
|
179 |
extern HOLO * |
180 |
hdinit( /* initialize a holodeck section in a file */ |
181 |
int fd, /* corresponding file descriptor */ |
182 |
HDGRID *hproto /* holodeck section grid */ |
183 |
) |
184 |
{ |
185 |
off_t rtrunc; |
186 |
off_t fpos; |
187 |
int writable; |
188 |
register HOLO *hp; |
189 |
register int n; |
190 |
/* prepare for system errors */ |
191 |
errno = 0; |
192 |
if ((fpos = lseek(fd, (off_t)0, SEEK_CUR)) < 0) |
193 |
error(SYSTEM, "cannot determine holodeck file position"); |
194 |
if (hproto == NULL) { /* assume we're loading it */ |
195 |
HDGRID hpr; |
196 |
/* load header */ |
197 |
if (read(fd, (char *)&hpr, sizeof(HDGRID)) != sizeof(HDGRID)) |
198 |
error(SYSTEM, "cannot load holodeck header"); |
199 |
/* allocate grid */ |
200 |
if ((hp = hdalloc(&hpr)) == NULL) |
201 |
goto memerr; |
202 |
/* load beam directory */ |
203 |
n = nbeams(hp)*sizeof(BEAMI); |
204 |
if (read(fd, (char *)(hp->bi+1), n) != n) |
205 |
error(SYSTEM, "failure loading holodeck directory"); |
206 |
/* check that it's clean */ |
207 |
for (n = nbeams(hp); n > 0; n--) |
208 |
if (hp->bi[n].fo < 0) { |
209 |
hp->bi[n].fo = 0; |
210 |
error(WARNING, "dirty holodeck section"); |
211 |
break; |
212 |
} |
213 |
/* check writability */ |
214 |
if (fd < nhdfragls && hdfragl[fd].nlinks) |
215 |
writable = hdfragl[fd].writable; |
216 |
else |
217 |
writable = lseek(fd, fpos, SEEK_SET) == fpos && |
218 |
write(fd, (char *)hp, sizeof(HDGRID)) == |
219 |
sizeof(HDGRID); |
220 |
} else { /* else assume we're creating it */ |
221 |
if ((hp = hdalloc(hproto)) == NULL) |
222 |
goto memerr; |
223 |
/* write header and skeleton */ |
224 |
n = nbeams(hp)*sizeof(BEAMI); |
225 |
if (write(fd, (char *)hproto, sizeof(HDGRID)) != |
226 |
sizeof(HDGRID) || |
227 |
write(fd, (char *)(hp->bi+1), n) != n) |
228 |
error(SYSTEM, "cannot write header to holodeck file"); |
229 |
writable = 1; |
230 |
} |
231 |
hp->fd = fd; |
232 |
hp->dirty = 0; |
233 |
biglob(hp)->fo = fpos + sizeof(HDGRID); |
234 |
/* start tracking fragments */ |
235 |
hdattach(fd, writable); |
236 |
/* check rays on disk */ |
237 |
fpos = hdfilen(fd); |
238 |
biglob(hp)->nrd = rtrunc = 0; |
239 |
for (n = hproto == NULL ? nbeams(hp) : 0; n > 0; n--) |
240 |
if (hp->bi[n].nrd) { |
241 |
if (hp->bi[n].fo+hp->bi[n].nrd*sizeof(RAYVAL) > fpos) { |
242 |
rtrunc += hp->bi[n].nrd; |
243 |
hp->bi[n].nrd = 0; |
244 |
} else |
245 |
biglob(hp)->nrd += hp->bi[n].nrd; |
246 |
} |
247 |
if (rtrunc) { |
248 |
sprintf(errmsg, "truncated section, %ld rays lost (%.1f%%)", |
249 |
(long)rtrunc, |
250 |
100.*rtrunc/(rtrunc+biglob(hp)->nrd)); |
251 |
error(WARNING, errmsg); |
252 |
} |
253 |
/* add to holodeck list */ |
254 |
for (n = 0; n < HDMAX; n++) |
255 |
if (hdlist[n] == NULL) { |
256 |
hdlist[n] = hp; |
257 |
break; |
258 |
} |
259 |
/* all done */ |
260 |
return(hp); |
261 |
memerr: |
262 |
error(SYSTEM, "cannot allocate holodeck grid"); |
263 |
return NULL; /* pro forma return */ |
264 |
} |
265 |
|
266 |
|
267 |
void |
268 |
hdmarkdirty( /* mark holodeck directory position dirty */ |
269 |
register HOLO *hp, |
270 |
int i |
271 |
) |
272 |
{ |
273 |
static BEAMI smudge = {0, -1}; |
274 |
int mindist, minpos; |
275 |
register int j; |
276 |
|
277 |
if (!hp->dirty++) { /* write smudge first time */ |
278 |
if (lseek(hp->fd, biglob(hp)->fo+(i-1)*sizeof(BEAMI), |
279 |
SEEK_SET) < 0 || |
280 |
write(hp->fd, (char *)&smudge, |
281 |
sizeof(BEAMI)) != sizeof(BEAMI)) |
282 |
error(SYSTEM, "seek/write error in hdmarkdirty"); |
283 |
hp->dirseg[0].s = i; |
284 |
hp->dirseg[0].n = 1; |
285 |
return; |
286 |
} |
287 |
/* insert into segment list */ |
288 |
for (j = hp->dirty; j--; ) { |
289 |
if (!j || hp->dirseg[j-1].s < i) { |
290 |
hp->dirseg[j].s = i; |
291 |
hp->dirseg[j].n = 1; |
292 |
break; |
293 |
} |
294 |
*(hp->dirseg+j) = *(hp->dirseg+(j-1)); |
295 |
} |
296 |
do { /* check neighbors */ |
297 |
mindist = nbeams(hp); /* find closest */ |
298 |
for (j = hp->dirty; --j; ) |
299 |
if (hp->dirseg[j].s - |
300 |
(hp->dirseg[j-1].s + hp->dirseg[j-1].n) |
301 |
< mindist) { |
302 |
minpos = j; |
303 |
mindist = hp->dirseg[j].s - |
304 |
(hp->dirseg[j-1].s + hp->dirseg[j-1].n); |
305 |
} |
306 |
/* good enough? */ |
307 |
if (hp->dirty <= MAXDIRSE && mindist > MINDIRSEL) |
308 |
break; |
309 |
j = minpos - 1; /* coalesce neighbors */ |
310 |
if (hp->dirseg[j].s + hp->dirseg[j].n < |
311 |
hp->dirseg[minpos].s + hp->dirseg[minpos].n) |
312 |
hp->dirseg[j].n = hp->dirseg[minpos].s + |
313 |
hp->dirseg[minpos].n - hp->dirseg[j].s; |
314 |
hp->dirty--; |
315 |
while (++j < hp->dirty) /* close the gap */ |
316 |
*(hp->dirseg+j) = *(hp->dirseg+(j+1)); |
317 |
} while (mindist <= MINDIRSEL); |
318 |
} |
319 |
|
320 |
|
321 |
extern int |
322 |
hdsync( /* update beams and directory on disk */ |
323 |
register HOLO *hp, |
324 |
int all |
325 |
) |
326 |
{ |
327 |
register int j, n; |
328 |
|
329 |
if (hp == NULL) { /* do all holodecks */ |
330 |
n = 0; |
331 |
for (j = 0; hdlist[j] != NULL; j++) |
332 |
n += hdsync(hdlist[j], all); |
333 |
return(n); |
334 |
} |
335 |
/* sync the beams */ |
336 |
for (j = (all ? nbeams(hp) : 0); j > 0; j--) |
337 |
if (hp->bl[j] != NULL) |
338 |
hdsyncbeam(hp, j); |
339 |
if (!hp->dirty) /* directory clean? */ |
340 |
return(0); |
341 |
errno = 0; /* write dirty segments */ |
342 |
for (j = 0; j < hp->dirty; j++) { |
343 |
if (lseek(hp->fd, biglob(hp)->fo + |
344 |
(hp->dirseg[j].s-1)*sizeof(BEAMI), SEEK_SET) < 0) |
345 |
error(SYSTEM, "cannot seek on holodeck file"); |
346 |
n = hp->dirseg[j].n * sizeof(BEAMI); |
347 |
if (write(hp->fd, (char *)(hp->bi+hp->dirseg[j].s), n) != n) |
348 |
error(SYSTEM, "cannot update section directory"); |
349 |
} |
350 |
hp->dirty = 0; /* all clean */ |
351 |
return(1); |
352 |
} |
353 |
|
354 |
|
355 |
unsigned int |
356 |
hdmemuse( /* return memory usage (in bytes) */ |
357 |
int all /* include overhead (painful) */ |
358 |
) |
359 |
{ |
360 |
long total = 0; |
361 |
register int i, j; |
362 |
|
363 |
for (j = 0; hdlist[j] != NULL; j++) { |
364 |
total += blglob(hdlist[j])->nrm * sizeof(RAYVAL); |
365 |
if (all) { |
366 |
total += sizeof(HOLO) + sizeof(BEAM *) + |
367 |
nbeams(hdlist[j]) * |
368 |
(sizeof(BEAM *)+sizeof(BEAMI)); |
369 |
for (i = nbeams(hdlist[j]); i > 0; i--) |
370 |
if (hdlist[j]->bl[i] != NULL) |
371 |
total += sizeof(BEAM); |
372 |
} |
373 |
} |
374 |
if (all) |
375 |
for (j = 0; j < nhdfragls; j++) { |
376 |
total += sizeof(struct fraglist); |
377 |
if (hdfragl[j].nfrags) |
378 |
total += FRAGBLK*sizeof(BEAMI) * |
379 |
((hdfragl[j].nfrags-1)/FRAGBLK + 1) ; |
380 |
} |
381 |
return(total); |
382 |
} |
383 |
|
384 |
|
385 |
extern off_t |
386 |
hdfilen( /* return file length for fd */ |
387 |
int fd |
388 |
) |
389 |
{ |
390 |
off_t fpos, flen; |
391 |
|
392 |
if (fd < 0) |
393 |
return(-1); |
394 |
if (fd >= nhdfragls || !hdfragl[fd].nlinks) { |
395 |
if ((fpos = lseek(fd, (off_t)0, SEEK_CUR)) < 0) |
396 |
return(-1); |
397 |
flen = lseek(fd, (off_t)0, SEEK_END); |
398 |
lseek(fd, fpos, SEEK_SET); |
399 |
return(flen); |
400 |
} |
401 |
return(hdfragl[fd].flen); |
402 |
} |
403 |
|
404 |
|
405 |
extern off_t |
406 |
hdfiluse( /* compute file usage (in bytes) */ |
407 |
int fd /* open file descriptor to check */ |
408 |
) |
409 |
{ |
410 |
off_t total = 0; |
411 |
register int j; |
412 |
|
413 |
for (j = 0; hdlist[j] != NULL; j++) { |
414 |
if (hdlist[j]->fd != fd) |
415 |
continue; |
416 |
total += biglob(hdlist[j])->nrd * sizeof(RAYVAL); |
417 |
total += nbeams(hdlist[j])*sizeof(BEAMI) + sizeof(HDGRID); |
418 |
#if 0 |
419 |
for (i = nbeams(hdlist[j]); i > 0; i--) |
420 |
if (hdlist[j]->bl[i] != NULL) |
421 |
total += sizeof(RAYVAL) * |
422 |
(hdlist[j]->bl[i]->nrm - |
423 |
hdlist[j]->bi[i].nrd); |
424 |
#endif |
425 |
} |
426 |
return(total); /* doesn't include fragments, unflushed rays */ |
427 |
} |
428 |
|
429 |
|
430 |
extern RAYVAL * |
431 |
hdnewrays( /* allocate space for add'l rays and return pointer */ |
432 |
register HOLO *hp, |
433 |
register int i, |
434 |
int nr /* number of new rays desired */ |
435 |
) |
436 |
{ |
437 |
RAYVAL *p; |
438 |
int n; |
439 |
|
440 |
if (nr <= 0) return(NULL); |
441 |
CHECK((i < 1) | (i > nbeams(hp)), |
442 |
CONSISTENCY, "bad beam index given to hdnewrays"); |
443 |
if (hp->bl[i] != NULL) |
444 |
hp->bl[i]->tick = hdclock; /* preempt swap */ |
445 |
if (hdcachesize > 0 && hdmemuse(0) >= hdcachesize) |
446 |
hdfreecache(PCTFREE, NULL); /* free some space */ |
447 |
if (hp->bl[i] == NULL) { /* allocate (and load) */ |
448 |
n = hp->bi[i].nrd + nr; |
449 |
hp->bl[i] = (BEAM *)hdrealloc(NULL, hdbsiz(n), "hdnewrays"); |
450 |
blglob(hp)->nrm += n; |
451 |
if ((n = hp->bl[i]->nrm = hp->bi[i].nrd)) { |
452 |
errno = 0; |
453 |
if (lseek(hp->fd, hp->bi[i].fo, SEEK_SET) < 0) |
454 |
error(SYSTEM, "seek error on holodeck file"); |
455 |
n *= sizeof(RAYVAL); |
456 |
if (read(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) |
457 |
error(SYSTEM, |
458 |
"error reading beam from holodeck file"); |
459 |
} |
460 |
} else { /* just grow in memory */ |
461 |
hp->bl[i] = (BEAM *)hdrealloc((char *)hp->bl[i], |
462 |
hdbsiz(hp->bl[i]->nrm + nr), "hdnewrays"); |
463 |
blglob(hp)->nrm += nr; |
464 |
} |
465 |
if (hdfragflags&FF_ALLOC && hp->bi[i].nrd) |
466 |
hdfreefrag(hp, i); /* relinquish old fragment */ |
467 |
p = hdbray(hp->bl[i]) + hp->bl[i]->nrm; |
468 |
hp->bl[i]->nrm += nr; /* update in-core structure */ |
469 |
memset((void *)p, '\0', nr*sizeof(RAYVAL)); |
470 |
blglob(hp)->tick = hp->bl[i]->tick = hdclock++; /* update LRU clock */ |
471 |
return(p); /* point to new rays */ |
472 |
} |
473 |
|
474 |
|
475 |
extern BEAM * |
476 |
hdgetbeam( /* get beam (from file if necessary) */ |
477 |
register HOLO *hp, |
478 |
register int i |
479 |
) |
480 |
{ |
481 |
register int n; |
482 |
|
483 |
CHECK((i < 1) | (i > nbeams(hp)), |
484 |
CONSISTENCY, "bad beam index given to hdgetbeam"); |
485 |
if (hp->bl[i] == NULL) { /* load from disk */ |
486 |
if (!(n = hp->bi[i].nrd)) |
487 |
return(NULL); |
488 |
if (hdcachesize > 0 && hdmemuse(0) >= hdcachesize) |
489 |
hdfreecache(PCTFREE, NULL); /* get free space */ |
490 |
hp->bl[i] = (BEAM *)hdrealloc(NULL, hdbsiz(n), "hdgetbeam"); |
491 |
blglob(hp)->nrm += hp->bl[i]->nrm = n; |
492 |
errno = 0; |
493 |
if (lseek(hp->fd, hp->bi[i].fo, SEEK_SET) < 0) |
494 |
error(SYSTEM, "seek error on holodeck file"); |
495 |
n *= sizeof(RAYVAL); |
496 |
if (read(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) |
497 |
error(SYSTEM, "error reading beam from holodeck file"); |
498 |
if (hdfragflags&FF_READ) |
499 |
hdfreefrag(hp, i); /* relinquish old frag. */ |
500 |
} |
501 |
blglob(hp)->tick = hp->bl[i]->tick = hdclock++; /* update LRU clock */ |
502 |
return(hp->bl[i]); |
503 |
} |
504 |
|
505 |
|
506 |
int |
507 |
hdfilord( /* order beams for quick loading */ |
508 |
register const void *hb1, |
509 |
register const void *hb2 |
510 |
) |
511 |
{ |
512 |
register off_t c; |
513 |
/* residents go first */ |
514 |
if (((HDBEAMI*)hb2)->h->bl[((HDBEAMI*)hb2)->b] != NULL) |
515 |
return(((HDBEAMI*)hb1)->h->bl[((HDBEAMI*)hb1)->b] == NULL); |
516 |
if (((HDBEAMI*)hb1)->h->bl[((HDBEAMI*)hb1)->b] != NULL) |
517 |
return(-1); |
518 |
/* otherwise sort by file descriptor */ |
519 |
if (((HDBEAMI*)hb1)->h->fd != ((HDBEAMI*)hb2)->h->fd) |
520 |
return(((HDBEAMI*)hb1)->h->fd - ((HDBEAMI*)hb2)->h->fd); |
521 |
/* then by position in file */ |
522 |
c = ((HDBEAMI*)hb1)->h->bi[((HDBEAMI*)hb1)->b].fo |
523 |
- ((HDBEAMI*)hb2)->h->bi[((HDBEAMI*)hb2)->b].fo; |
524 |
return(c > 0 ? 1 : c < 0 ? -1 : 0); |
525 |
} |
526 |
|
527 |
|
528 |
extern void |
529 |
hdloadbeams( /* load a list of beams in optimal order */ |
530 |
register HDBEAMI *hb, /* list gets sorted by hdfilord() */ |
531 |
int n, /* list length */ |
532 |
void (*bf)(BEAM *bp, HDBEAMI *hb) /* callback function (optional) */ |
533 |
) |
534 |
{ |
535 |
unsigned origcachesize, memuse; |
536 |
int bytesloaded, needbytes, bytes2free; |
537 |
register BEAM *bp; |
538 |
register int i; |
539 |
/* precheck consistency */ |
540 |
if (n <= 0) return; |
541 |
for (i = n; i--; ) |
542 |
if (hb[i].h==NULL || (hb[i].b<1) | (hb[i].b>nbeams(hb[i].h))) |
543 |
error(CONSISTENCY, "bad beam in hdloadbeams"); |
544 |
/* sort list for optimal access */ |
545 |
qsort((void *)hb, n, sizeof(HDBEAMI), hdfilord); |
546 |
bytesloaded = 0; /* run through loaded beams */ |
547 |
for ( ; n && (bp = hb->h->bl[hb->b]) != NULL; n--, hb++) { |
548 |
bp->tick = hdclock; /* preempt swap */ |
549 |
bytesloaded += bp->nrm; |
550 |
if (bf != NULL) |
551 |
(*bf)(bp, hb); |
552 |
} |
553 |
bytesloaded *= sizeof(RAYVAL); |
554 |
if ((origcachesize = hdcachesize) > 0) { |
555 |
needbytes = 0; /* figure out memory needs */ |
556 |
for (i = n; i--; ) |
557 |
needbytes += hb[i].h->bi[hb[i].b].nrd; |
558 |
needbytes *= sizeof(RAYVAL); |
559 |
do { /* free enough memory */ |
560 |
memuse = hdmemuse(0); |
561 |
bytes2free = needbytes - (int)(hdcachesize-memuse); |
562 |
if (bytes2free > (int)(memuse - bytesloaded)) |
563 |
bytes2free = memuse - bytesloaded; |
564 |
} while (bytes2free > 0 && |
565 |
hdfreecache(100*bytes2free/memuse, NULL) < 0); |
566 |
hdcachesize = 0; /* load beams w/o swap */ |
567 |
} |
568 |
for (i = 0; i < n; i++) |
569 |
if ((bp = hdgetbeam(hb[i].h, hb[i].b)) != NULL && bf != NULL) |
570 |
(*bf)(bp, hb+i); |
571 |
hdcachesize = origcachesize; /* resume dynamic swapping */ |
572 |
} |
573 |
|
574 |
|
575 |
extern int |
576 |
hdfreefrag( /* free a file fragment */ |
577 |
HOLO *hp, |
578 |
int i |
579 |
) |
580 |
{ |
581 |
register BEAMI *bi = &hp->bi[i]; |
582 |
register struct fraglist *f; |
583 |
register int j, k; |
584 |
|
585 |
if (bi->nrd <= 0) |
586 |
return(0); |
587 |
DCHECK(hp->fd < 0 | hp->fd >= nhdfragls || !hdfragl[hp->fd].nlinks, |
588 |
CONSISTENCY, "bad file descriptor in hdfreefrag"); |
589 |
f = &hdfragl[hp->fd]; |
590 |
if (!f->writable) |
591 |
return(0); |
592 |
if (f->nfrags % FRAGBLK == 0) { /* delete empty remnants */ |
593 |
for (j = k = 0; k < f->nfrags; j++, k++) { |
594 |
while (f->fi[k].nrd == 0) |
595 |
if (++k >= f->nfrags) |
596 |
goto endloop; |
597 |
if (k > j) |
598 |
*(f->fi+j) = *(f->fi+k); |
599 |
} |
600 |
endloop: |
601 |
f->nfrags = j; |
602 |
} |
603 |
j = f->nfrags++; /* allocate a slot in free list */ |
604 |
#if MAXFRAGB |
605 |
if (j >= MAXFRAGB*FRAGBLK) { |
606 |
f->nfrags = j--; /* stop list growth */ |
607 |
if (bi->nrd <= f->fi[j].nrd) |
608 |
return(0); /* new one no better than discard */ |
609 |
} |
610 |
#endif |
611 |
if (j % FRAGBLK == 0) { /* more (or less) free list space */ |
612 |
register BEAMI *newp; |
613 |
if (f->fi == NULL) |
614 |
newp = (BEAMI *)malloc((j+FRAGBLK)*sizeof(BEAMI)); |
615 |
else |
616 |
newp = (BEAMI *)realloc((void *)f->fi, |
617 |
(j+FRAGBLK)*sizeof(BEAMI)); |
618 |
if (newp == NULL) { |
619 |
f->nfrags--; /* graceful failure */ |
620 |
return(0); |
621 |
} |
622 |
f->fi = newp; |
623 |
} |
624 |
for ( ; ; j--) { /* insert in descending list */ |
625 |
if (!j || bi->fo < f->fi[j-1].fo) { |
626 |
f->fi[j].fo = bi->fo; |
627 |
f->fi[j].nrd = bi->nrd; |
628 |
break; |
629 |
} |
630 |
*(f->fi+j) = *(f->fi+(j-1)); |
631 |
} |
632 |
/* coalesce adjacent fragments */ |
633 |
/* successors never empty */ |
634 |
if (j && f->fi[j-1].fo == f->fi[j].fo + f->fi[j].nrd*sizeof(RAYVAL)) { |
635 |
f->fi[j].nrd += f->fi[j-1].nrd; |
636 |
f->fi[j-1].nrd = 0; |
637 |
} |
638 |
for (k = j+1; k < f->nfrags; k++) /* get non-empty predecessor */ |
639 |
if (f->fi[k].nrd) { |
640 |
if (f->fi[j].fo == f->fi[k].fo + |
641 |
f->fi[k].nrd*sizeof(RAYVAL)) { |
642 |
f->fi[k].nrd += f->fi[j].nrd; |
643 |
f->fi[j].nrd = 0; |
644 |
} |
645 |
break; |
646 |
} |
647 |
biglob(hp)->nrd -= bi->nrd; /* tell fragment it's free */ |
648 |
bi->nrd = 0; |
649 |
bi->fo = 0; |
650 |
hdmarkdirty(hp, i); /* assume we'll reallocate */ |
651 |
return(1); |
652 |
} |
653 |
|
654 |
|
655 |
extern int |
656 |
hdfragOK( /* get fragment list status for file */ |
657 |
int fd, |
658 |
int *listlen, |
659 |
register int32 *listsiz |
660 |
) |
661 |
{ |
662 |
register struct fraglist *f; |
663 |
register int i; |
664 |
|
665 |
if ((fd < 0) | (fd >= nhdfragls) || !(f = &hdfragl[fd])->nlinks) |
666 |
return(0); /* listless */ |
667 |
if (listlen != NULL) |
668 |
*listlen = f->nfrags; |
669 |
if (listsiz != NULL) |
670 |
for (i = f->nfrags, *listsiz = 0; i--; ) |
671 |
*listsiz += f->fi[i].nrd; |
672 |
#if MAXFRAGB |
673 |
return(f->nfrags < MAXFRAGB*FRAGBLK); |
674 |
#else |
675 |
return(1); /* list never fills up */ |
676 |
#endif |
677 |
} |
678 |
|
679 |
|
680 |
off_t |
681 |
hdallocfrag( /* allocate a file fragment */ |
682 |
int fd, |
683 |
uint32 nrays |
684 |
) |
685 |
{ |
686 |
register struct fraglist *f; |
687 |
register int j; |
688 |
off_t nfo; |
689 |
|
690 |
if (nrays == 0) |
691 |
return(-1L); |
692 |
DCHECK(fd < 0 | fd >= nhdfragls || !hdfragl[fd].nlinks, |
693 |
CONSISTENCY, "bad file descriptor in hdallocfrag"); |
694 |
f = &hdfragl[fd]; |
695 |
for (j = f->nfrags; j-- > 0; ) /* first fit algorithm */ |
696 |
if (f->fi[j].nrd >= nrays) |
697 |
break; |
698 |
if (j < 0) { /* no fragment -- extend file */ |
699 |
nfo = f->flen; |
700 |
f->flen += nrays*sizeof(RAYVAL); |
701 |
} else { /* else use fragment */ |
702 |
nfo = f->fi[j].fo; |
703 |
f->fi[j].fo += nrays*sizeof(RAYVAL); |
704 |
f->fi[j].nrd -= nrays; |
705 |
} |
706 |
return(nfo); |
707 |
} |
708 |
|
709 |
|
710 |
int |
711 |
hdsyncbeam( /* sync beam in memory with beam on disk */ |
712 |
register HOLO *hp, |
713 |
register int i |
714 |
) |
715 |
{ |
716 |
int fragfreed; |
717 |
uint32 nrays; |
718 |
unsigned int n; |
719 |
off_t nfo; |
720 |
/* check file status */ |
721 |
if (hdfragl[hp->fd].writable <= 0) |
722 |
return(hdfragl[hp->fd].writable); |
723 |
DCHECK(i < 1 | i > nbeams(hp), |
724 |
CONSISTENCY, "bad beam index in hdsyncbeam"); |
725 |
/* is current fragment OK? */ |
726 |
if (hp->bl[i] == NULL || (nrays = hp->bl[i]->nrm) == hp->bi[i].nrd) |
727 |
return(0); |
728 |
/* relinquish old fragment? */ |
729 |
fragfreed = hdfragflags&FF_WRITE && hp->bi[i].nrd && hdfreefrag(hp,i); |
730 |
if (nrays) { /* get and write new fragment */ |
731 |
nfo = hdallocfrag(hp->fd, nrays); |
732 |
errno = 0; |
733 |
if (lseek(hp->fd, nfo, SEEK_SET) < 0) |
734 |
error(SYSTEM, "cannot seek on holodeck file"); |
735 |
n = hp->bl[i]->nrm * sizeof(RAYVAL); |
736 |
if (write(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) { |
737 |
hdfragl[hp->fd].writable = -1; |
738 |
hdsync(NULL, 0); /* sync directories */ |
739 |
error(SYSTEM, "write error in hdsyncbeam"); |
740 |
} |
741 |
hp->bi[i].fo = nfo; |
742 |
} else |
743 |
hp->bi[i].fo = 0; |
744 |
biglob(hp)->nrd += nrays - hp->bi[i].nrd; |
745 |
hp->bi[i].nrd = nrays; |
746 |
if (!fragfreed) |
747 |
hdmarkdirty(hp, i); /* need to flag dir. ent. */ |
748 |
return(1); |
749 |
} |
750 |
|
751 |
|
752 |
extern int |
753 |
hdfreebeam( /* free beam, writing if dirty */ |
754 |
register HOLO *hp, |
755 |
register int i |
756 |
) |
757 |
{ |
758 |
int nchanged; |
759 |
|
760 |
if (hp == NULL) { /* clear all holodecks */ |
761 |
nchanged = 0; |
762 |
for (i = 0; hdlist[i] != NULL; i++) |
763 |
nchanged += hdfreebeam(hdlist[i], 0); |
764 |
return(nchanged); |
765 |
} |
766 |
if (hdfragl[hp->fd].writable < 0) /* check for file error */ |
767 |
return(0); |
768 |
if (i == 0) { /* clear entire holodeck */ |
769 |
if (blglob(hp)->nrm == 0) |
770 |
return(0); /* already clear */ |
771 |
nchanged = 0; |
772 |
for (i = nbeams(hp); i > 0; i--) |
773 |
if (hp->bl[i] != NULL) |
774 |
nchanged += hdfreebeam(hp, i); |
775 |
DCHECK(blglob(hp)->nrm != 0, |
776 |
CONSISTENCY, "bad beam count in hdfreebeam"); |
777 |
return(nchanged); |
778 |
} |
779 |
DCHECK(i < 1 | i > nbeams(hp), |
780 |
CONSISTENCY, "bad beam index to hdfreebeam"); |
781 |
if (hp->bl[i] == NULL) |
782 |
return(0); |
783 |
/* check for additions */ |
784 |
nchanged = hp->bl[i]->nrm - hp->bi[i].nrd; |
785 |
if (nchanged) |
786 |
hdsyncbeam(hp, i); /* write new fragment */ |
787 |
blglob(hp)->nrm -= hp->bl[i]->nrm; |
788 |
free((void *)hp->bl[i]); /* free memory */ |
789 |
hp->bl[i] = NULL; |
790 |
return(nchanged); |
791 |
} |
792 |
|
793 |
|
794 |
extern int |
795 |
hdkillbeam( /* delete beam from holodeck */ |
796 |
register HOLO *hp, |
797 |
register int i |
798 |
) |
799 |
{ |
800 |
int nchanged; |
801 |
|
802 |
if (hp == NULL) { /* clobber all holodecks */ |
803 |
nchanged = 0; |
804 |
for (i = 0; hdlist[i] != NULL; i++) |
805 |
nchanged += hdkillbeam(hdlist[i], 0); |
806 |
return(nchanged); |
807 |
} |
808 |
if (i == 0) { /* clobber entire holodeck */ |
809 |
if ((biglob(hp)->nrd == 0) & (blglob(hp)->nrm == 0)) |
810 |
return(0); /* already empty */ |
811 |
nchanged = 0; |
812 |
nchanged = 0; |
813 |
for (i = nbeams(hp); i > 0; i--) |
814 |
if (hp->bi[i].nrd > 0 || hp->bl[i] != NULL) |
815 |
nchanged += hdkillbeam(hp, i); |
816 |
DCHECK(biglob(hp)->nrd != 0 | blglob(hp)->nrm != 0, |
817 |
CONSISTENCY, "bad beam count in hdkillbeam"); |
818 |
return(nchanged); |
819 |
} |
820 |
DCHECK(i < 1 | i > nbeams(hp), CONSISTENCY, |
821 |
"bad beam index to hdkillbeam"); |
822 |
DCHECK(!hdfragl[hp->fd].writable, CONSISTENCY, |
823 |
"hdkillbeam called on read-only holodeck"); |
824 |
if (hp->bl[i] != NULL) { /* free memory */ |
825 |
blglob(hp)->nrm -= nchanged = hp->bl[i]->nrm; |
826 |
free((void *)hp->bl[i]); |
827 |
hp->bl[i] = NULL; |
828 |
} else |
829 |
nchanged = hp->bi[i].nrd; |
830 |
if (hp->bi[i].nrd && !(hdfragflags&FF_KILL && hdfreefrag(hp,i))) { |
831 |
biglob(hp)->nrd -= hp->bi[i].nrd; /* free failed */ |
832 |
hp->bi[i].nrd = 0; |
833 |
hp->bi[i].fo = 0; |
834 |
hdmarkdirty(hp, i); |
835 |
} |
836 |
return(nchanged); |
837 |
} |
838 |
|
839 |
|
840 |
int |
841 |
hdlrulist( /* add beams from holodeck to LRU list */ |
842 |
register HDBEAMI *hb, /* beam list */ |
843 |
int nents, /* current list length */ |
844 |
int n, /* maximum list length */ |
845 |
register HOLO *hp /* section we're adding from */ |
846 |
) |
847 |
{ |
848 |
register int i, j; |
849 |
/* insert each beam from hp */ |
850 |
for (i = 1; i <= nbeams(hp); i++) { |
851 |
if (hp->bl[i] == NULL) /* check if loaded */ |
852 |
continue; |
853 |
#if 0 |
854 |
if (hp->bl[i]->tick == hdclock) /* preempt swap? */ |
855 |
continue; |
856 |
#endif |
857 |
if ((j = ++nents) >= n) /* grow list if we can */ |
858 |
nents--; |
859 |
for ( ; ; ) { /* bubble into place */ |
860 |
if (!--j || hp->bl[i]->tick >= |
861 |
hb[j-1].h->bl[hb[j-1].b]->tick) { |
862 |
hb[j].h = hp; |
863 |
hb[j].b = i; |
864 |
break; |
865 |
} |
866 |
*(hb+j) = *(hb+(j-1)); |
867 |
} |
868 |
} |
869 |
return(nents); /* return new list length */ |
870 |
} |
871 |
|
872 |
|
873 |
int |
874 |
hdfreecache( /* free up cache space, writing changes */ |
875 |
int pct, /* maximum percentage to free */ |
876 |
register HOLO *honly /* NULL means check all */ |
877 |
) |
878 |
{ |
879 |
HDBEAMI hb[FREEBEAMS]; |
880 |
int freetarget; |
881 |
int n; |
882 |
register int i; |
883 |
#ifdef DEBUG |
884 |
unsigned membefore; |
885 |
|
886 |
membefore = hdmemuse(0); |
887 |
#endif |
888 |
/* compute free target */ |
889 |
freetarget = (honly != NULL) ? blglob(honly)->nrm : |
890 |
hdmemuse(0)/sizeof(RAYVAL) ; |
891 |
freetarget = freetarget*pct/100; |
892 |
if (freetarget <= 0) |
893 |
return(0); |
894 |
/* find least recently used */ |
895 |
n = 0; |
896 |
if (honly != NULL) |
897 |
n = hdlrulist(hb, n, FREEBEAMS, honly); |
898 |
else |
899 |
for (i = 0; hdlist[i] != NULL; i++) |
900 |
n = hdlrulist(hb, n, FREEBEAMS, hdlist[i]); |
901 |
/* free LRU beams */ |
902 |
for (i = 0; i < n; i++) { |
903 |
hdfreebeam(hb[i].h, hb[i].b); |
904 |
if ((freetarget -= hb[i].h->bi[hb[i].b].nrd) <= 0) |
905 |
break; |
906 |
} |
907 |
hdsync(honly, 0); /* synchronize directories as necessary */ |
908 |
#ifdef DEBUG |
909 |
sprintf(errmsg, |
910 |
"%dK before, %dK after hdfreecache (%dK total), %d rays short\n", |
911 |
membefore>>10, hdmemuse(0)>>10, hdmemuse(1)>>10, freetarget); |
912 |
wputs(errmsg); |
913 |
#endif |
914 |
return(-freetarget); /* return how far past goal we went */ |
915 |
} |
916 |
|
917 |
|
918 |
extern void |
919 |
hddone( /* clean up holodeck section and free */ |
920 |
register HOLO *hp /* NULL means clean up all */ |
921 |
) |
922 |
{ |
923 |
register int i; |
924 |
|
925 |
if (hp == NULL) { /* NULL means clean up everything */ |
926 |
while (hdlist[0] != NULL) |
927 |
hddone(hdlist[0]); |
928 |
free((void *)hdfragl); |
929 |
hdfragl = NULL; nhdfragls = 0; |
930 |
return; |
931 |
} |
932 |
/* flush all data and free memory */ |
933 |
hdflush(hp); |
934 |
/* release fragment resources */ |
935 |
hdrelease(hp->fd); |
936 |
/* remove hp from active list */ |
937 |
for (i = 0; hdlist[i] != NULL; i++) |
938 |
if (hdlist[i] == hp) { |
939 |
while ((hdlist[i] = hdlist[i+1]) != NULL) |
940 |
i++; |
941 |
break; |
942 |
} |
943 |
free((void *)hp->bl); /* free beam list */ |
944 |
free((void *)hp); /* free holodeck struct */ |
945 |
} |