1 |
/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
2 |
|
3 |
#ifndef lint |
4 |
static char SCCSid[] = "$SunId$ SGI"; |
5 |
#endif |
6 |
|
7 |
/* |
8 |
* Routines for managing holodeck files |
9 |
* |
10 |
* 9/30/97 GWLarson |
11 |
*/ |
12 |
|
13 |
#include "holo.h" |
14 |
|
15 |
#ifndef CACHESIZE |
16 |
#define CACHESIZE 16 /* default cache size (Mbytes, 0==inf) */ |
17 |
#endif |
18 |
#ifndef FREEBEAMS |
19 |
#define FREEBEAMS 1500 /* maximum beams to free at a time */ |
20 |
#endif |
21 |
#ifndef PCTFREE |
22 |
#define PCTFREE 15 /* maximum fraction to free (%) */ |
23 |
#endif |
24 |
#ifndef MAXFRAG |
25 |
#define MAXFRAG 32767 /* maximum fragments/file to track (0==inf) */ |
26 |
#endif |
27 |
|
28 |
#ifndef BSD |
29 |
#define write writebuf /* safe i/o routines */ |
30 |
#define read readbuf |
31 |
#endif |
32 |
|
33 |
#define FRAGBLK 256 /* number of fragments to allocate at a time */ |
34 |
|
35 |
unsigned hdcachesize = CACHESIZE*1024*1024; /* target cache size */ |
36 |
unsigned long hdclock; /* clock value */ |
37 |
|
38 |
HOLO *hdlist[HDMAX+1]; /* holodeck pointers (NULL term.) */ |
39 |
|
40 |
static struct fraglist { |
41 |
short nlinks; /* number of holodeck sections using us */ |
42 |
short writerr; /* write error encountered */ |
43 |
int nfrags; /* number of known fragments */ |
44 |
BEAMI *fi; /* fragments, descending file position */ |
45 |
long flen; /* last known file length */ |
46 |
} *hdfragl; /* fragment lists, indexed by file descriptor */ |
47 |
|
48 |
static int nhdfragls; /* size of hdfragl array */ |
49 |
|
50 |
|
51 |
char * |
52 |
hdrealloc(ptr, siz, rout) /* (re)allocate memory, retry then error */ |
53 |
char *ptr; |
54 |
unsigned siz; |
55 |
char *rout; |
56 |
{ |
57 |
register char *newp; |
58 |
/* call malloc/realloc */ |
59 |
if (ptr == NULL) newp = (char *)malloc(siz); |
60 |
else newp = (char *)realloc(ptr, siz); |
61 |
/* check success */ |
62 |
if (newp == NULL && rout != NULL) { |
63 |
hdfreecache(25, NULL); /* free some memory */ |
64 |
errno = 0; /* retry */ |
65 |
newp = hdrealloc(ptr, siz, NULL); |
66 |
if (newp == NULL) { /* give up and report error */ |
67 |
sprintf(errmsg, "out of memory in %s", rout); |
68 |
error(SYSTEM, errmsg); |
69 |
} |
70 |
} |
71 |
return(newp); |
72 |
} |
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|
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|
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hdattach(fd) /* start tracking file fragments for some section */ |
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register int fd; |
77 |
{ |
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if (fd >= nhdfragls) { |
79 |
hdfragl = (struct fraglist *)hdrealloc((char *)hdfragl, |
80 |
(fd+1)*sizeof(struct fraglist), "hdattach"); |
81 |
bzero((char *)(hdfragl+nhdfragls), |
82 |
(fd+1-nhdfragls)*sizeof(struct fraglist)); |
83 |
nhdfragls = fd+1; |
84 |
} |
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hdfragl[fd].nlinks++; |
86 |
hdfragl[fd].flen = lseek(fd, 0L, 2); /* get file length */ |
87 |
} |
88 |
|
89 |
|
90 |
/* Do we need a routine to locate file fragments given known occupants? */ |
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|
92 |
|
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hdrelease(fd) /* stop tracking file fragments for some section */ |
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register int fd; |
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{ |
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if (fd < 0 | fd >= nhdfragls || !hdfragl[fd].nlinks) |
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return; |
98 |
if (!--hdfragl[fd].nlinks && hdfragl[fd].nfrags) { |
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free((char *)hdfragl[fd].fi); |
100 |
hdfragl[fd].fi = NULL; |
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hdfragl[fd].nfrags = 0; |
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} |
103 |
} |
104 |
|
105 |
|
106 |
HOLO * |
107 |
hdinit(fd, hproto) /* initialize a holodeck section in a file */ |
108 |
int fd; /* corresponding file descriptor */ |
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HDGRID *hproto; /* holodeck section grid */ |
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{ |
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long rtrunc; |
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long fpos; |
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register HOLO *hp; |
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register int n; |
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/* prepare for system errors */ |
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errno = 0; |
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if ((fpos = lseek(fd, 0L, 1)) < 0) |
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error(SYSTEM, "cannot determine holodeck file position"); |
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if (hproto == NULL) { /* assume we're loading it */ |
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HDGRID hpr; |
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/* load header */ |
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if (read(fd, (char *)&hpr, sizeof(HDGRID)) != sizeof(HDGRID)) |
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error(SYSTEM, "cannot load holodeck header"); |
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/* allocate grid */ |
125 |
if ((hp = hdalloc(&hpr)) == NULL) |
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goto memerr; |
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/* load beam directory */ |
128 |
n = nbeams(hp)*sizeof(BEAMI); |
129 |
if (read(fd, (char *)(hp->bi+1), n) != n) |
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error(SYSTEM, "failure loading holodeck directory"); |
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/* check that it's clean */ |
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for (n = nbeams(hp); n > 0; n--) |
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if (hp->bi[n].fo < 0) { |
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hp->bi[n].fo = 0; |
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error(WARNING, "dirty holodeck section"); |
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break; |
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} |
138 |
} else { /* assume we're creating it */ |
139 |
if ((hp = hdalloc(hproto)) == NULL) |
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goto memerr; |
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/* write header and skeleton */ |
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n = nbeams(hp)*sizeof(BEAMI); |
143 |
if (write(fd, (char *)hproto, sizeof(HDGRID)) != |
144 |
sizeof(HDGRID) || |
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write(fd, (char *)(hp->bi+1), n) != n) |
146 |
error(SYSTEM, "cannot write header to holodeck file"); |
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} |
148 |
hp->fd = fd; |
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hp->dirty = 0; |
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biglob(hp)->fo = fpos + sizeof(HDGRID); |
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/* start tracking fragments */ |
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hdattach(fd); |
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/* check rays on disk */ |
154 |
fpos = hdfilen(fd); |
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biglob(hp)->nrd = rtrunc = 0; |
156 |
for (n = hproto == NULL ? nbeams(hp) : 0; n > 0; n--) |
157 |
if (hp->bi[n].nrd) |
158 |
if (hp->bi[n].fo+hp->bi[n].nrd*sizeof(RAYVAL) > fpos) { |
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rtrunc += hp->bi[n].nrd; |
160 |
hp->bi[n].nrd = 0; |
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} else |
162 |
biglob(hp)->nrd += hp->bi[n].nrd; |
163 |
if (rtrunc) { |
164 |
sprintf(errmsg, "truncated section, %ld rays lost (%.1f%%)", |
165 |
rtrunc, 100.*rtrunc/(rtrunc+biglob(hp)->nrd)); |
166 |
error(WARNING, errmsg); |
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} |
168 |
/* add to holodeck list */ |
169 |
for (n = 0; n < HDMAX; n++) |
170 |
if (hdlist[n] == NULL) { |
171 |
hdlist[n] = hp; |
172 |
break; |
173 |
} |
174 |
/* all done */ |
175 |
return(hp); |
176 |
memerr: |
177 |
error(SYSTEM, "cannot allocate holodeck grid"); |
178 |
} |
179 |
|
180 |
|
181 |
markdirty(hp, i) /* mark holodeck directory position dirty */ |
182 |
register HOLO *hp; |
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int i; |
184 |
{ |
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static BEAMI smudge = {0, -1}; |
186 |
int mindist, minpos; |
187 |
register int j; |
188 |
|
189 |
if (!hp->dirty++) { /* write smudge first time */ |
190 |
if (lseek(hp->fd, biglob(hp)->fo+(i-1)*sizeof(BEAMI), 0) < 0 |
191 |
|| write(hp->fd, (char *)&smudge, |
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sizeof(BEAMI)) != sizeof(BEAMI)) |
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error(SYSTEM, "seek/write error in markdirty"); |
194 |
hp->dirseg[0].s = i; |
195 |
hp->dirseg[0].n = 1; |
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return; |
197 |
} |
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/* insert into segment list */ |
199 |
for (j = hp->dirty; j--; ) { |
200 |
if (!j || hp->dirseg[j-1].s < i) { |
201 |
hp->dirseg[j].s = i; |
202 |
hp->dirseg[j].n = 1; |
203 |
break; |
204 |
} |
205 |
copystruct(hp->dirseg+j, hp->dirseg+(j-1)); |
206 |
} |
207 |
mindist = nbeams(hp); /* find closest neighbors */ |
208 |
for (j = hp->dirty; --j; ) |
209 |
if (hp->dirseg[j].s - (hp->dirseg[j-1].s + hp->dirseg[j-1].n) |
210 |
< mindist) { |
211 |
mindist = hp->dirseg[j].s - |
212 |
(hp->dirseg[j-1].s + hp->dirseg[j-1].n); |
213 |
minpos = j; |
214 |
} |
215 |
if (hp->dirty > MAXDIRSE || mindist <= BUFSIZ/sizeof(BEAMI)) { |
216 |
j = minpos - 1; /* coalesce neighbors */ |
217 |
if (hp->dirseg[j].s + hp->dirseg[j].n < |
218 |
hp->dirseg[minpos].s + hp->dirseg[minpos].n) { |
219 |
hp->dirseg[j].n = hp->dirseg[minpos].s + |
220 |
hp->dirseg[minpos].n - hp->dirseg[j].s; |
221 |
} |
222 |
hp->dirty--; /* close the gap */ |
223 |
for (j = minpos; j < hp->dirty; j++) |
224 |
copystruct(hp->dirseg+j, hp->dirseg+(j+1)); |
225 |
} |
226 |
} |
227 |
|
228 |
|
229 |
int |
230 |
hdsync(hp, all) /* update beams and directory on disk */ |
231 |
register HOLO *hp; |
232 |
int all; |
233 |
{ |
234 |
register int j, n; |
235 |
|
236 |
if (hp == NULL) { /* do all holodecks */ |
237 |
n = 0; |
238 |
for (j = 0; hdlist[j] != NULL; j++) |
239 |
n += hdsync(hdlist[j], all); |
240 |
return(n); |
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} |
242 |
/* sync the beams */ |
243 |
for (j = (all ? nbeams(hp) : 0); j > 0; j--) |
244 |
if (hp->bl[j] != NULL) |
245 |
hdsyncbeam(hp, j); |
246 |
if (!hp->dirty) /* directory clean? */ |
247 |
return(0); |
248 |
errno = 0; /* write dirty segments */ |
249 |
for (j = 0; j < hp->dirty; j++) { |
250 |
if (lseek(hp->fd, biglob(hp)->fo + |
251 |
(hp->dirseg[j].s-1)*sizeof(BEAMI), 0) < 0) |
252 |
error(SYSTEM, "cannot seek on holodeck file"); |
253 |
n = hp->dirseg[j].n * sizeof(BEAMI); |
254 |
if (write(hp->fd, (char *)(hp->bi+hp->dirseg[j].s), n) != n) |
255 |
error(SYSTEM, "cannot update section directory"); |
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} |
257 |
hp->dirty = 0; /* all clean */ |
258 |
return(1); |
259 |
} |
260 |
|
261 |
|
262 |
unsigned |
263 |
hdmemuse(all) /* return memory usage (in bytes) */ |
264 |
int all; /* include overhead (painful) */ |
265 |
{ |
266 |
long total = 0; |
267 |
register int i, j; |
268 |
|
269 |
for (j = 0; hdlist[j] != NULL; j++) { |
270 |
total += blglob(hdlist[j])->nrm * sizeof(RAYVAL); |
271 |
if (all) { |
272 |
total += sizeof(HOLO) + sizeof(BEAM *) + |
273 |
nbeams(hdlist[j]) * |
274 |
(sizeof(BEAM *)+sizeof(BEAMI)); |
275 |
for (i = nbeams(hdlist[j]); i > 0; i--) |
276 |
if (hdlist[j]->bl[i] != NULL) |
277 |
total += sizeof(BEAM); |
278 |
} |
279 |
} |
280 |
if (all) |
281 |
for (j = 0; j < nhdfragls; j++) { |
282 |
total += sizeof(struct fraglist); |
283 |
if (hdfragl[j].nfrags) |
284 |
total += FRAGBLK*sizeof(BEAMI) * |
285 |
((hdfragl[j].nfrags-1)/FRAGBLK + 1) ; |
286 |
} |
287 |
return(total); |
288 |
} |
289 |
|
290 |
|
291 |
long |
292 |
hdfilen(fd) /* return file length for fd */ |
293 |
int fd; |
294 |
{ |
295 |
long fpos, flen; |
296 |
|
297 |
if (fd < 0) |
298 |
return(-1); |
299 |
if (fd >= nhdfragls || !hdfragl[fd].nlinks) { |
300 |
if ((fpos = lseek(fd, 0L, 1)) < 0) |
301 |
return(-1); |
302 |
flen = lseek(fd, 0L, 2); |
303 |
lseek(fd, fpos, 0); |
304 |
return(flen); |
305 |
} |
306 |
return(hdfragl[fd].flen); |
307 |
} |
308 |
|
309 |
|
310 |
long |
311 |
hdfiluse(fd, all) /* compute file usage (in bytes) */ |
312 |
int fd; /* open file descriptor to check */ |
313 |
int all; /* include overhead and unflushed data */ |
314 |
{ |
315 |
long total = 0; |
316 |
register int i, j; |
317 |
|
318 |
for (j = 0; hdlist[j] != NULL; j++) { |
319 |
if (hdlist[j]->fd != fd) |
320 |
continue; |
321 |
total += biglob(hdlist[j])->nrd * sizeof(RAYVAL); |
322 |
if (all) { |
323 |
for (i = nbeams(hdlist[j]); i > 0; i--) |
324 |
if (hdlist[j]->bl[i] != NULL) |
325 |
total += sizeof(RAYVAL) * |
326 |
(hdlist[j]->bl[i]->nrm - |
327 |
hdlist[j]->bi[i].nrd); |
328 |
total += sizeof(HDGRID) + |
329 |
nbeams(hdlist[j])*sizeof(BEAMI); |
330 |
} |
331 |
} |
332 |
return(total); /* does not include fragments */ |
333 |
} |
334 |
|
335 |
|
336 |
RAYVAL * |
337 |
hdnewrays(hp, i, nr) /* allocate space for add'l rays and return pointer */ |
338 |
register HOLO *hp; |
339 |
register int i; |
340 |
int nr; /* number of new rays desired */ |
341 |
{ |
342 |
RAYVAL *p; |
343 |
int n; |
344 |
|
345 |
if (nr <= 0) |
346 |
return(NULL); |
347 |
if (i < 1 | i > nbeams(hp)) |
348 |
error(CONSISTENCY, "bad beam index given to hdnewrays"); |
349 |
if (hp->bl[i] != NULL) |
350 |
hp->bl[i]->tick = hdclock; /* preempt swap */ |
351 |
if (hdcachesize > 0 && hdmemuse(0) >= hdcachesize) |
352 |
hdfreecache(PCTFREE, NULL); /* free some space */ |
353 |
if (hp->bl[i] == NULL) { /* allocate (and load) */ |
354 |
n = hp->bi[i].nrd + nr; |
355 |
hp->bl[i] = (BEAM *)hdrealloc(NULL, hdbsiz(n), "hdnewrays"); |
356 |
blglob(hp)->nrm += n; |
357 |
if (n = hp->bl[i]->nrm = hp->bi[i].nrd) { |
358 |
errno = 0; |
359 |
if (lseek(hp->fd, hp->bi[i].fo, 0) < 0) |
360 |
error(SYSTEM, "seek error on holodeck file"); |
361 |
n *= sizeof(RAYVAL); |
362 |
if (read(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) |
363 |
error(SYSTEM, |
364 |
"error reading beam from holodeck file"); |
365 |
} |
366 |
} else { /* just grow in memory */ |
367 |
hp->bl[i] = (BEAM *)hdrealloc((char *)hp->bl[i], |
368 |
hdbsiz(hp->bl[i]->nrm + nr), "hdnewrays"); |
369 |
blglob(hp)->nrm += nr; |
370 |
} |
371 |
p = hdbray(hp->bl[i]) + hp->bl[i]->nrm; |
372 |
hp->bl[i]->nrm += nr; /* update in-core structure */ |
373 |
bzero((char *)p, nr*sizeof(RAYVAL)); |
374 |
blglob(hp)->tick = hp->bl[i]->tick = hdclock++; /* update LRU clock */ |
375 |
return(p); /* point to new rays */ |
376 |
} |
377 |
|
378 |
|
379 |
BEAM * |
380 |
hdgetbeam(hp, i) /* get beam (from file if necessary) */ |
381 |
register HOLO *hp; |
382 |
register int i; |
383 |
{ |
384 |
register int n; |
385 |
|
386 |
if (i < 1 | i > nbeams(hp)) |
387 |
error(CONSISTENCY, "bad beam index given to hdgetbeam"); |
388 |
if (hp->bl[i] == NULL) { /* load from disk */ |
389 |
if (!(n = hp->bi[i].nrd)) |
390 |
return(NULL); |
391 |
if (hdcachesize > 0 && hdmemuse(0) >= hdcachesize) |
392 |
hdfreecache(PCTFREE, NULL); /* get free space */ |
393 |
hp->bl[i] = (BEAM *)hdrealloc(NULL, hdbsiz(n), "hdgetbeam"); |
394 |
blglob(hp)->nrm += hp->bl[i]->nrm = n; |
395 |
errno = 0; |
396 |
if (lseek(hp->fd, hp->bi[i].fo, 0) < 0) |
397 |
error(SYSTEM, "seek error on holodeck file"); |
398 |
n *= sizeof(RAYVAL); |
399 |
if (read(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) |
400 |
error(SYSTEM, "error reading beam from holodeck file"); |
401 |
} |
402 |
blglob(hp)->tick = hp->bl[i]->tick = hdclock++; /* update LRU clock */ |
403 |
return(hp->bl[i]); |
404 |
} |
405 |
|
406 |
|
407 |
int |
408 |
hdfilord(hb1, hb2) /* order beams for quick loading */ |
409 |
register HDBEAMI *hb1, *hb2; |
410 |
{ |
411 |
register long c; |
412 |
/* residents go first */ |
413 |
if (hb2->h->bl[hb2->b] != NULL) |
414 |
return(hb1->h->bl[hb1->b] == NULL); |
415 |
if (hb1->h->bl[hb1->b] != NULL) |
416 |
return(-1); |
417 |
/* otherwise sort by file descriptor */ |
418 |
if ((c = hb1->h->fd - hb2->h->fd)) |
419 |
return(c); |
420 |
/* then by position in file */ |
421 |
c = hb1->h->bi[hb1->b].fo - hb2->h->bi[hb2->b].fo; |
422 |
return(c > 0 ? 1 : c < 0 ? -1 : 0); |
423 |
} |
424 |
|
425 |
|
426 |
hdloadbeams(hb, n, bf) /* load a list of beams in optimal order */ |
427 |
register HDBEAMI *hb; /* list gets sorted by hdfilord() */ |
428 |
int n; /* list length */ |
429 |
int (*bf)(); /* callback function (optional) */ |
430 |
{ |
431 |
unsigned origcachesize, memuse; |
432 |
int bytesloaded, needbytes, bytes2free; |
433 |
register BEAM *bp; |
434 |
register int i; |
435 |
/* precheck consistency */ |
436 |
if (n <= 0) return; |
437 |
for (i = n; i--; ) |
438 |
if (hb[i].h == NULL || hb[i].b < 1 | hb[i].b > nbeams(hb[i].h)) |
439 |
error(CONSISTENCY, "bad beam in hdloadbeams"); |
440 |
/* sort list for optimal access */ |
441 |
qsort((char *)hb, n, sizeof(HDBEAMI), hdfilord); |
442 |
bytesloaded = 0; /* run through loaded beams */ |
443 |
for ( ; n && (bp = hb->h->bl[hb->b]) != NULL; n--, hb++) { |
444 |
bp->tick = hdclock; /* preempt swap */ |
445 |
bytesloaded += bp->nrm; |
446 |
if (bf != NULL) |
447 |
(*bf)(bp, hb); |
448 |
} |
449 |
bytesloaded *= sizeof(RAYVAL); |
450 |
if ((origcachesize = hdcachesize) > 0) { |
451 |
needbytes = 0; /* figure out memory needs */ |
452 |
for (i = n; i--; ) |
453 |
needbytes += hb[i].h->bi[hb[i].b].nrd; |
454 |
needbytes *= sizeof(RAYVAL); |
455 |
do { /* free enough memory */ |
456 |
memuse = hdmemuse(0); |
457 |
bytes2free = needbytes - (int)(hdcachesize-memuse); |
458 |
if (bytes2free > (int)(memuse - bytesloaded)) |
459 |
bytes2free = memuse - bytesloaded; |
460 |
} while (bytes2free > 0 && |
461 |
hdfreecache(100*bytes2free/memuse, NULL) < 0); |
462 |
hdcachesize = 0; /* load beams w/o swap */ |
463 |
} |
464 |
for (i = 0; i < n; i++) |
465 |
if ((bp = hdgetbeam(hb[i].h, hb[i].b)) != NULL && bf != NULL) |
466 |
(*bf)(bp, hb+i); |
467 |
hdcachesize = origcachesize; /* resume dynamic swapping */ |
468 |
} |
469 |
|
470 |
|
471 |
hdfreefrag(fd, bi) /* free a file fragment */ |
472 |
int fd; |
473 |
register BEAMI *bi; |
474 |
{ |
475 |
register struct fraglist *f; |
476 |
register int j, k; |
477 |
|
478 |
if (bi->nrd == 0) |
479 |
return; |
480 |
#ifdef DEBUG |
481 |
if (fd < 0 | fd >= nhdfragls || !hdfragl[fd].nlinks) |
482 |
error(CONSISTENCY, "bad file descriptor in hdfreefrag"); |
483 |
#endif |
484 |
f = &hdfragl[fd]; |
485 |
if (f->nfrags % FRAGBLK == 0) { /* delete empty remnants */ |
486 |
for (j = k = 0; k < f->nfrags; j++, k++) { |
487 |
while (f->fi[k].nrd == 0) |
488 |
if (++k >= f->nfrags) |
489 |
goto endloop; |
490 |
if (k > j) |
491 |
copystruct(f->fi+j, f->fi+k); |
492 |
} |
493 |
endloop: |
494 |
f->nfrags = j; |
495 |
} |
496 |
j = f->nfrags++; /* allocate a slot in free list */ |
497 |
#if MAXFRAG |
498 |
if (j >= MAXFRAG-1) |
499 |
f->nfrags--; |
500 |
#endif |
501 |
if (j % FRAGBLK == 0) { /* more free list space */ |
502 |
register BEAMI *newp; |
503 |
if (f->fi == NULL) |
504 |
newp = (BEAMI *)malloc((j+FRAGBLK)*sizeof(BEAMI)); |
505 |
else |
506 |
newp = (BEAMI *)realloc((char *)f->fi, |
507 |
(j+FRAGBLK)*sizeof(BEAMI)); |
508 |
if (newp == NULL) { |
509 |
f->nfrags--; /* graceful failure */ |
510 |
return; |
511 |
} |
512 |
f->fi = newp; |
513 |
} |
514 |
for ( ; ; j--) { /* insert in descending list */ |
515 |
if (!j || bi->fo < f->fi[j-1].fo) { |
516 |
f->fi[j].fo = bi->fo; |
517 |
f->fi[j].nrd = bi->nrd; |
518 |
break; |
519 |
} |
520 |
copystruct(f->fi+j, f->fi+(j-1)); |
521 |
} |
522 |
/* coalesce adjacent fragments */ |
523 |
/* successors never empty */ |
524 |
if (j && f->fi[j-1].fo == f->fi[j].fo + f->fi[j].nrd*sizeof(RAYVAL)) { |
525 |
f->fi[j].nrd += f->fi[j-1].nrd; |
526 |
f->fi[j-1].nrd = 0; |
527 |
} |
528 |
for (k = j+1; k < f->nfrags; k++) /* get non-empty predecessor */ |
529 |
if (f->fi[k].nrd) { |
530 |
if (f->fi[j].fo == f->fi[k].fo + |
531 |
f->fi[k].nrd*sizeof(RAYVAL)) { |
532 |
f->fi[k].nrd += f->fi[j].nrd; |
533 |
f->fi[j].nrd = 0; |
534 |
} |
535 |
break; |
536 |
} |
537 |
} |
538 |
|
539 |
|
540 |
long |
541 |
hdallocfrag(fd, nrays) /* allocate a file fragment */ |
542 |
int fd; |
543 |
unsigned int4 nrays; |
544 |
{ |
545 |
register struct fraglist *f; |
546 |
register int j, k; |
547 |
long nfo; |
548 |
|
549 |
if (nrays == 0) |
550 |
return(-1L); |
551 |
#ifdef DEBUG |
552 |
if (fd < 0 | fd >= nhdfragls || !hdfragl[fd].nlinks) |
553 |
error(CONSISTENCY, "bad file descriptor in hdallocfrag"); |
554 |
#endif |
555 |
f = &hdfragl[fd]; |
556 |
k = -1; /* find closest-sized fragment */ |
557 |
for (j = f->nfrags; j-- > 0; ) |
558 |
if (f->fi[j].nrd >= nrays && |
559 |
(k < 0 || f->fi[j].nrd < f->fi[k].nrd)) |
560 |
if (f->fi[k=j].nrd == nrays) |
561 |
break; |
562 |
if (k < 0) { /* no fragment -- extend file */ |
563 |
nfo = f->flen; |
564 |
f->flen += nrays*sizeof(RAYVAL); |
565 |
} else { /* else use fragment */ |
566 |
nfo = f->fi[k].fo; |
567 |
f->fi[k].fo += nrays*sizeof(RAYVAL); |
568 |
f->fi[k].nrd -= nrays; |
569 |
} |
570 |
return(nfo); |
571 |
} |
572 |
|
573 |
|
574 |
int |
575 |
hdsyncbeam(hp, i) /* sync beam in memory with beam on disk */ |
576 |
register HOLO *hp; |
577 |
register int i; |
578 |
{ |
579 |
unsigned int4 nrays; |
580 |
unsigned int n; |
581 |
long nfo; |
582 |
/* check file status */ |
583 |
if (hdfragl[hp->fd].writerr) |
584 |
return(-1); |
585 |
#ifdef DEBUG |
586 |
if (i < 1 | i > nbeams(hp)) |
587 |
error(CONSISTENCY, "bad beam index in hdsyncbeam"); |
588 |
#endif |
589 |
/* is current fragment OK? */ |
590 |
if (hp->bl[i] == NULL || (nrays = hp->bl[i]->nrm) == hp->bi[i].nrd) |
591 |
return(0); |
592 |
if (hp->bi[i].nrd) /* relinquish old fragment */ |
593 |
hdfreefrag(hp->fd, &hp->bi[i]); |
594 |
if (nrays) { /* get and write new fragment */ |
595 |
nfo = hdallocfrag(hp->fd, nrays); |
596 |
errno = 0; |
597 |
if (lseek(hp->fd, nfo, 0) < 0) |
598 |
error(SYSTEM, "cannot seek on holodeck file"); |
599 |
n = hp->bl[i]->nrm * sizeof(RAYVAL); |
600 |
if (write(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) { |
601 |
hdfragl[hp->fd].writerr++; |
602 |
hdsync(NULL, 0); /* sync directories */ |
603 |
error(SYSTEM, "write error in hdsyncbeam"); |
604 |
} |
605 |
hp->bi[i].fo = nfo; |
606 |
} else |
607 |
hp->bi[i].fo = 0L; |
608 |
biglob(hp)->nrd += nrays - hp->bi[i].nrd; |
609 |
hp->bi[i].nrd = nrays; |
610 |
markdirty(hp, i); /* section directory now out of date */ |
611 |
return(1); |
612 |
} |
613 |
|
614 |
|
615 |
int |
616 |
hdfreebeam(hp, i) /* free beam, writing if dirty */ |
617 |
register HOLO *hp; |
618 |
register int i; |
619 |
{ |
620 |
int nchanged; |
621 |
|
622 |
if (hp == NULL) { /* clear all holodecks */ |
623 |
nchanged = 0; |
624 |
for (i = 0; hdlist[i] != NULL; i++) |
625 |
nchanged += hdfreebeam(hdlist[i], 0); |
626 |
return(nchanged); |
627 |
} |
628 |
if (hdfragl[hp->fd].writerr) /* check for file error */ |
629 |
return(0); |
630 |
if (i == 0) { /* clear entire holodeck */ |
631 |
nchanged = 0; |
632 |
for (i = nbeams(hp); i > 0; i--) |
633 |
if (hp->bl[i] != NULL) |
634 |
nchanged += hdfreebeam(hp, i); |
635 |
return(nchanged); |
636 |
} |
637 |
#ifdef DEBUG |
638 |
if (i < 1 | i > nbeams(hp)) |
639 |
error(CONSISTENCY, "bad beam index to hdfreebeam"); |
640 |
#endif |
641 |
if (hp->bl[i] == NULL) |
642 |
return(0); |
643 |
/* check for additions */ |
644 |
nchanged = hp->bl[i]->nrm - hp->bi[i].nrd; |
645 |
if (nchanged) |
646 |
hdsyncbeam(hp, i); /* write new fragment */ |
647 |
blglob(hp)->nrm -= hp->bl[i]->nrm; |
648 |
free((char *)hp->bl[i]); /* free memory */ |
649 |
hp->bl[i] = NULL; |
650 |
return(nchanged); |
651 |
} |
652 |
|
653 |
|
654 |
int |
655 |
hdkillbeam(hp, i) /* delete beam from holodeck */ |
656 |
register HOLO *hp; |
657 |
register int i; |
658 |
{ |
659 |
static BEAM emptybeam; |
660 |
int nchanged; |
661 |
|
662 |
if (hp == NULL) { /* clobber all holodecks */ |
663 |
nchanged = 0; |
664 |
for (i = 0; hdlist[i] != NULL; i++) |
665 |
nchanged += hdkillbeam(hdlist[i], 0); |
666 |
return(nchanged); |
667 |
} |
668 |
if (i == 0) { /* clobber entire holodeck */ |
669 |
nchanged = 0; |
670 |
for (i = nbeams(hp); i > 0; i--) |
671 |
if (hp->bi[i].nrd > 0 || hp->bl[i] != NULL) |
672 |
nchanged += hdkillbeam(hp, i); |
673 |
#ifdef DEBUG |
674 |
if (biglob(hp)->nrd != 0 | blglob(hp)->nrm != 0) |
675 |
error(CONSISTENCY, "bad beam count in hdkillbeam"); |
676 |
#endif |
677 |
return(nchanged); |
678 |
} |
679 |
#ifdef DEBUG |
680 |
if (i < 1 | i > nbeams(hp)) |
681 |
error(CONSISTENCY, "bad beam index to hdkillbeam"); |
682 |
#endif |
683 |
if (hp->bl[i] != NULL) { /* free memory */ |
684 |
blglob(hp)->nrm -= nchanged = hp->bl[i]->nrm; |
685 |
free((char *)hp->bl[i]); |
686 |
} else |
687 |
nchanged = hp->bi[i].nrd; |
688 |
if (hp->bi[i].nrd) { /* free file fragment */ |
689 |
hp->bl[i] = &emptybeam; |
690 |
hdsyncbeam(hp, i); |
691 |
} |
692 |
hp->bl[i] = NULL; |
693 |
return(nchanged); |
694 |
} |
695 |
|
696 |
|
697 |
int |
698 |
hdlrulist(hb, nents, n, hp) /* add beams from holodeck to LRU list */ |
699 |
register HDBEAMI *hb; /* beam list */ |
700 |
int nents; /* current list length */ |
701 |
int n; /* maximum list length */ |
702 |
register HOLO *hp; /* section we're adding from */ |
703 |
{ |
704 |
register int i, j; |
705 |
/* insert each beam from hp */ |
706 |
for (i = 1; i <= nbeams(hp); i++) { |
707 |
if (hp->bl[i] == NULL) /* check if loaded */ |
708 |
continue; |
709 |
#if 0 |
710 |
if (hp->bl[i]->tick == hdclock) /* preempt swap? */ |
711 |
continue; |
712 |
#endif |
713 |
if ((j = ++nents) >= n) /* grow list if we can */ |
714 |
nents--; |
715 |
for ( ; ; ) { /* bubble into place */ |
716 |
if (!--j || hp->bl[i]->tick >= |
717 |
hb[j-1].h->bl[hb[j-1].b]->tick) { |
718 |
hb[j].h = hp; |
719 |
hb[j].b = i; |
720 |
break; |
721 |
} |
722 |
copystruct(hb+j, hb+(j-1)); |
723 |
} |
724 |
} |
725 |
return(nents); /* return new list length */ |
726 |
} |
727 |
|
728 |
|
729 |
int |
730 |
hdfreecache(pct, honly) /* free up cache space, writing changes */ |
731 |
int pct; /* maximum percentage to free */ |
732 |
register HOLO *honly; /* NULL means check all */ |
733 |
{ |
734 |
HDBEAMI hb[FREEBEAMS]; |
735 |
int freetarget; |
736 |
int n; |
737 |
register int i; |
738 |
#ifdef DEBUG |
739 |
unsigned membefore; |
740 |
|
741 |
membefore = hdmemuse(0); |
742 |
#endif |
743 |
/* compute free target */ |
744 |
freetarget = (honly != NULL) ? blglob(honly)->nrm : |
745 |
hdmemuse(0)/sizeof(RAYVAL) ; |
746 |
freetarget = freetarget*pct/100; |
747 |
if (freetarget <= 0) |
748 |
return(0); |
749 |
/* find least recently used */ |
750 |
n = 0; |
751 |
if (honly != NULL) |
752 |
n = hdlrulist(hb, n, FREEBEAMS, honly); |
753 |
else |
754 |
for (i = 0; hdlist[i] != NULL; i++) |
755 |
n = hdlrulist(hb, n, FREEBEAMS, hdlist[i]); |
756 |
/* free LRU beams */ |
757 |
for (i = 0; i < n; i++) { |
758 |
hdfreebeam(hb[i].h, hb[i].b); |
759 |
if ((freetarget -= hb[i].h->bi[hb[i].b].nrd) <= 0) |
760 |
break; |
761 |
} |
762 |
hdsync(honly, 0); /* synchronize directories as necessary */ |
763 |
#ifdef DEBUG |
764 |
sprintf(errmsg, |
765 |
"%dK before, %dK after hdfreecache (%dK total), %d rays short\n", |
766 |
membefore>>10, hdmemuse(0)>>10, hdmemuse(1)>>10, freetarget); |
767 |
wputs(errmsg); |
768 |
#endif |
769 |
return(-freetarget); /* return how far past goal we went */ |
770 |
} |
771 |
|
772 |
|
773 |
hddone(hp) /* clean up holodeck section and free */ |
774 |
register HOLO *hp; /* NULL means clean up all */ |
775 |
{ |
776 |
register int i; |
777 |
|
778 |
if (hp == NULL) { /* NULL means clean up everything */ |
779 |
while (hdlist[0] != NULL) |
780 |
hddone(hdlist[0]); |
781 |
free((char *)hdfragl); |
782 |
hdfragl = NULL; nhdfragls = 0; |
783 |
return; |
784 |
} |
785 |
/* flush all data and free memory */ |
786 |
hdfreebeam(hp, 0); |
787 |
hdsync(hp, 0); |
788 |
/* release fragment resources */ |
789 |
hdrelease(hp->fd); |
790 |
/* remove hp from active list */ |
791 |
for (i = 0; hdlist[i] != NULL; i++) |
792 |
if (hdlist[i] == hp) { |
793 |
while ((hdlist[i] = hdlist[i+1]) != NULL) |
794 |
i++; |
795 |
break; |
796 |
} |
797 |
free((char *)hp->bl); /* free beam list */ |
798 |
free((char *)hp); /* free holodeck struct */ |
799 |
} |