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gregl |
3.1 |
/* Copyright (c) 1997 Silicon Graphics, Inc. */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ SGI"; |
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#endif |
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/* |
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* Routines for managing holodeck files |
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* |
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* 9/30/97 GWLarson |
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*/ |
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#include "holo.h" |
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#ifndef CACHESIZE |
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#define CACHESIZE 16 /* default cache size (Mbytes, 0==inf) */ |
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#endif |
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#ifndef FREEBEAMS |
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#define FREEBEAMS 1024 /* maximum beams to free at a time */ |
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#endif |
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#ifndef PCTFREE |
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#define PCTFREE 12 /* maximum fraction to free (%) */ |
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#endif |
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#ifndef FFDMAX |
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#define FFDMAX 64 /* max. file descriptor for tracking */ |
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#endif |
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#ifndef MAXFRAG |
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#define MAXFRAG 2048 /* maximum fragments tracked in each file */ |
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#endif |
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int hdcachesize = CACHESIZE*1024*1024; /* target cache size (bytes) */ |
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unsigned long hdclock; /* clock value */ |
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HOLO *hdlist[HDMAX+1]; /* holodeck pointers (NULL term.) */ |
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static struct fragment { |
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short nlinks; /* number of holodeck sections using us */ |
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short nfrags; /* number of known fragments */ |
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BEAMI fi[MAXFRAG]; /* fragments, descending file position */ |
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long flen; /* last known file length */ |
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} *hdfrag[FFDMAX]; /* fragment lists, indexed by file descriptor */ |
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hdattach(fd) /* start tracking file fragments for some section */ |
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register int fd; |
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{ |
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if (fd >= FFDMAX) |
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return; /* descriptor out of range */ |
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if (hdfrag[fd] == NULL) { |
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if ((hdfrag[fd] = (struct fragment *) |
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malloc(sizeof(struct fragment))) == NULL) |
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return; /* should flag error? */ |
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hdfrag[fd]->nlinks = 0; |
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hdfrag[fd]->nfrags = 0; |
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} |
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hdfrag[fd]->nlinks++; |
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hdfrag[fd]->flen = lseek(fd, 0L, 2); /* get file length */ |
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} |
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/* Do we need a routine to locate file fragments given known occupants? */ |
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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 >= FFDMAX || hdfrag[fd] == NULL) |
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return; |
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if (!--hdfrag[fd]->nlinks) { |
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free((char *)hdfrag[fd]); |
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hdfrag[fd] = NULL; |
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} |
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} |
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HOLO * |
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hdinit(fd, hproto) /* initialize a holodeck section in a file */ |
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int fd; /* corresponding file descriptor */ |
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HDGRID *hproto; /* holodeck section grid */ |
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{ |
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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 */ |
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if ((hp = hdalloc(&hpr)) == NULL) |
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goto memerr; |
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/* load beam directory */ |
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n = nbeams(hp)*sizeof(BEAMI); |
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if (read(fd, (char *)(hp->bi+1), n) != n) |
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error(SYSTEM, "failure loading holodeck directory"); |
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} else { /* assume we're creating it */ |
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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); |
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if (write(fd, (char *)hproto, sizeof(HDGRID)) != |
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sizeof(HDGRID) || |
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write(fd, (char *)(hp->bi+1), n) != n) |
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error(SYSTEM, "cannot write header to holodeck file"); |
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} |
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hp->fd = fd; |
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hp->dirty = 0; |
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biglob(hp)->fo = fpos + sizeof(HDGRID); |
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biglob(hp)->nrd = 0; /* count rays on disk */ |
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for (n = nbeams(hp); n > 0; n--) |
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biglob(hp)->nrd += hp->bi[n].nrd; |
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/* add to holodeck list */ |
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for (n = 0; n < HDMAX; n++) |
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if (hdlist[n] == NULL) { |
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hdlist[n] = hp; |
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break; |
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} |
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/* start tracking fragments (last) */ |
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hdattach(fd); |
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/* all done */ |
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return(hp); |
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memerr: |
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error(SYSTEM, "cannot allocate holodeck grid"); |
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} |
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int |
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hdsync(hp) /* update directory on disk if necessary */ |
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register HOLO *hp; |
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{ |
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register int j, n; |
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if (hp == NULL) { /* do all */ |
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n = 0; |
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for (j = 0; hdlist[j] != NULL; j++) |
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n += hdsync(hdlist[j]); |
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return(n); |
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} |
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if (!hp->dirty) /* check first */ |
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return(0); |
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if (lseek(hp->fd, biglob(hp)->fo, 0) < 0) |
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error(SYSTEM, "cannot seek on holodeck file"); |
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n = nbeams(hp)*sizeof(BEAMI); |
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if (write(hp->fd, (char *)(hp->bi+1), n) != n) |
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error(SYSTEM, "cannot update holodeck section directory"); |
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hp->dirty = 0; |
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return(1); |
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} |
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long |
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hdmemuse(all) /* return memory usage (in bytes) */ |
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int all; /* include overhead (painful) */ |
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{ |
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long total = 0; |
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register int i, j; |
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for (j = 0; hdlist[j] != NULL; j++) { |
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total += blglob(hdlist[j])->nrm * sizeof(RAYVAL); |
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if (all) { |
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total += sizeof(HOLO) + sizeof(BEAM *) + |
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nbeams(hdlist[j]) * |
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(sizeof(BEAM *)+sizeof(BEAMI)); |
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for (i = nbeams(hdlist[j]); i > 0; i--) |
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if (hdlist[j]->bl[i] != NULL) |
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total += sizeof(BEAM); |
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} |
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} |
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if (all) |
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for (j = 0; j < FFDMAX; j++) |
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if (hdfrag[j] != NULL) |
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total += sizeof(struct fragment); |
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return(total); |
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} |
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long |
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hdfiluse(fd, all) /* compute file usage (in bytes) */ |
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int fd; /* open file descriptor to check */ |
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int all; /* include overhead and unflushed data */ |
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{ |
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long total = 0; |
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register int i, j; |
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for (j = 0; hdlist[j] != NULL; j++) { |
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if (hdlist[j]->fd != fd) |
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continue; |
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total += biglob(hdlist[j])->nrd * sizeof(RAYVAL); |
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if (all) { |
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for (i = nbeams(hdlist[j]); i > 0; i--) |
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if (hdlist[j]->bl[i] != NULL) |
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total += sizeof(RAYVAL) * |
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(hdlist[j]->bl[i]->nrm - |
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hdlist[j]->bi[i].nrd); |
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total += sizeof(HDGRID) + |
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nbeams(hdlist[j])*sizeof(BEAMI); |
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} |
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} |
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return(total); /* does not include fragments */ |
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} |
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RAYVAL * |
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hdnewrays(hp, i, nr) /* allocate space for add'l rays and return pointer */ |
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register HOLO *hp; |
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register int i; |
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int nr; /* number of new rays desired */ |
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{ |
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RAYVAL *p; |
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int n; |
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if (nr <= 0) |
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return(NULL); |
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if (i < 1 | i > nbeams(hp)) |
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error(CONSISTENCY, "bad beam index given to hdnewrays"); |
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if (hp->bl[i] != NULL) |
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hp->bl[i]->tick = hdclock; /* preempt swap */ |
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if (hdcachesize > 0 && hdmemuse(0) >= hdcachesize) |
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hdfreecache(PCTFREE, NULL); /* free some space */ |
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if (hp->bl[i] == NULL) { /* allocate (and load) */ |
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n = hp->bi[i].nrd + nr; |
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if ((hp->bl[i] = (BEAM *)malloc(hdbsiz(n))) == NULL) |
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goto memerr; |
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blglob(hp)->nrm += n; |
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if (n = hp->bl[i]->nrm = hp->bi[i].nrd) { |
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if (lseek(hp->fd, hp->bi[i].fo, 0) < 0) |
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error(SYSTEM, "seek error on holodeck file"); |
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n *= sizeof(RAYVAL); |
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if (read(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) |
| 234 |
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error(SYSTEM, |
| 235 |
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"error reading beam from holodeck file"); |
| 236 |
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} |
| 237 |
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} else { /* just grow in memory */ |
| 238 |
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hp->bl[i] = (BEAM *)realloc( (char *)hp->bl[i], |
| 239 |
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hdbsiz(hp->bl[i]->nrm + nr) ); |
| 240 |
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if (hp->bl[i] == NULL) |
| 241 |
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goto memerr; |
| 242 |
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blglob(hp)->nrm += nr; |
| 243 |
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} |
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p = hdbray(hp->bl[i]) + hp->bl[i]->nrm; |
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hp->bl[i]->nrm += nr; /* update in-core structure */ |
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bzero((char *)p, nr*sizeof(RAYVAL)); |
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hp->bl[i]->tick = ++hdclock; /* update LRU clock */ |
| 248 |
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blglob(hp)->tick = hdclock; |
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return(p); /* point to new rays */ |
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memerr: |
| 251 |
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error(SYSTEM, "out of memory in hdnewrays"); |
| 252 |
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} |
| 253 |
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| 254 |
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| 255 |
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BEAM * |
| 256 |
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hdgetbeam(hp, i) /* get beam (from file if necessary) */ |
| 257 |
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register HOLO *hp; |
| 258 |
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register int i; |
| 259 |
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{ |
| 260 |
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register int n; |
| 261 |
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| 262 |
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if (i < 1 | i > nbeams(hp)) |
| 263 |
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error(CONSISTENCY, "bad beam index given to hdgetbeam"); |
| 264 |
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if (hp->bl[i] == NULL) { /* load from disk */ |
| 265 |
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if (!(n = hp->bi[i].nrd)) |
| 266 |
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return(NULL); |
| 267 |
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if (hdcachesize > 0 && hdmemuse(0) >= hdcachesize) |
| 268 |
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hdfreecache(PCTFREE, NULL); /* get free space */ |
| 269 |
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errno = 0; |
| 270 |
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if ((hp->bl[i] = (BEAM *)malloc(hdbsiz(n))) == NULL) |
| 271 |
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error(SYSTEM, "cannot allocate memory for beam"); |
| 272 |
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blglob(hp)->nrm += hp->bl[i]->nrm = n; |
| 273 |
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if (lseek(hp->fd, hp->bi[i].fo, 0) < 0) |
| 274 |
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error(SYSTEM, "seek error on holodeck file"); |
| 275 |
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n *= sizeof(RAYVAL); |
| 276 |
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if (read(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) |
| 277 |
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error(SYSTEM, "error reading beam from holodeck file"); |
| 278 |
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} |
| 279 |
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hp->bl[i]->tick = ++hdclock; /* update LRU clock */ |
| 280 |
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blglob(hp)->tick = hdclock; |
| 281 |
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return(hp->bl[i]); |
| 282 |
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} |
| 283 |
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| 284 |
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| 285 |
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int |
| 286 |
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hdgetbi(hp, i) /* allocate a file fragment */ |
| 287 |
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register HOLO *hp; |
| 288 |
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register int i; |
| 289 |
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{ |
| 290 |
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int nrays = hp->bl[i]->nrm; |
| 291 |
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| 292 |
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if (hp->bi[i].nrd == nrays) /* current one will do? */ |
| 293 |
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return(0); |
| 294 |
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| 295 |
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if (hp->fd >= FFDMAX || hdfrag[hp->fd] == NULL) /* untracked */ |
| 296 |
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hp->bi[i].fo = lseek(hp->fd, 0L, 2); |
| 297 |
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| 298 |
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else if (hp->bi[i].fo + hp->bi[i].nrd*sizeof(RAYVAL) == |
| 299 |
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hdfrag[hp->fd]->flen) /* EOF special case */ |
| 300 |
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hdfrag[hp->fd]->flen = hp->bi[i].fo + nrays*sizeof(RAYVAL); |
| 301 |
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| 302 |
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else { /* general case */ |
| 303 |
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register struct fragment *f = hdfrag[hp->fd]; |
| 304 |
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register int j, k; |
| 305 |
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/* relinquish old fragment */ |
| 306 |
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if ((j = ++f->nfrags) >= MAXFRAG) |
| 307 |
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f->nfrags--; |
| 308 |
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for ( ; ; ) { /* stick it in our descending list */ |
| 309 |
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if (!--j || hp->bi[i].fo < f->fi[j-1].fo) { |
| 310 |
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f->fi[j].fo = hp->bi[i].fo; |
| 311 |
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f->fi[j].nrd = hp->bi[i].nrd; |
| 312 |
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break; |
| 313 |
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} |
| 314 |
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copystruct(f->fi+j, f->fi+j-1); |
| 315 |
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} |
| 316 |
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/* coalesce adjacent fragments */ |
| 317 |
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for (j = k = 0; k < f->nfrags; j++, k++) { |
| 318 |
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if (j != k) |
| 319 |
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copystruct(f->fi+j, f->fi+k); |
| 320 |
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while (k+1 < f->nfrags && |
| 321 |
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f->fi[k+1].fo + f->fi[k+1].nrd*sizeof(RAYVAL) == |
| 322 |
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f->fi[j].fo) |
| 323 |
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f->fi[j].fo -= f->fi[++k].nrd*sizeof(RAYVAL); |
| 324 |
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} |
| 325 |
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f->nfrags = j; |
| 326 |
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k = -1; /* find closest-sized fragment */ |
| 327 |
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for (j = f->nfrags; j-- > 0; ) |
| 328 |
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if (f->fi[j].nrd >= nrays && |
| 329 |
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(k < 0 || f->fi[j].nrd < f->fi[k].nrd) |
| 330 |
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&& f->fi[k=j].nrd == nrays) |
| 331 |
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break; |
| 332 |
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if (k < 0) { /* no fragment -- extend file */ |
| 333 |
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hp->bi[i].fo = f->flen; |
| 334 |
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f->flen += nrays*sizeof(RAYVAL); |
| 335 |
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} else { /* else use fragment */ |
| 336 |
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hp->bi[i].fo = f->fi[k].fo; |
| 337 |
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if (f->fi[k].nrd == nrays) { /* delete fragment */ |
| 338 |
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f->nfrags--; |
| 339 |
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for (j = k; j < f->nfrags; j++) |
| 340 |
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copystruct(f->fi+j, f->fi+j+1); |
| 341 |
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} else { /* else shrink it */ |
| 342 |
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f->fi[k].fo += nrays*sizeof(RAYVAL); |
| 343 |
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f->fi[k].nrd -= nrays; |
| 344 |
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} |
| 345 |
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} |
| 346 |
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} |
| 347 |
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biglob(hp)->nrd += nrays - hp->bi[i].nrd; |
| 348 |
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hp->bi[i].nrd = nrays; |
| 349 |
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hp->dirty++; /* section directory now out of date */ |
| 350 |
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return(1); |
| 351 |
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} |
| 352 |
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| 353 |
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| 354 |
|
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int |
| 355 |
|
|
hdfreebeam(hp, i) /* free beam, writing if dirty */ |
| 356 |
|
|
register HOLO *hp; |
| 357 |
|
|
register int i; |
| 358 |
|
|
{ |
| 359 |
|
|
int nchanged, n; |
| 360 |
|
|
|
| 361 |
|
|
if (hp == NULL) { /* clear all holodecks */ |
| 362 |
|
|
nchanged = 0; |
| 363 |
|
|
for (i = 0; hdlist[i] != NULL; i++) |
| 364 |
|
|
nchanged += hdfreebeam(hdlist[i], 0); |
| 365 |
|
|
return(nchanged); |
| 366 |
|
|
} |
| 367 |
|
|
if (i == 0) { /* clear entire holodeck */ |
| 368 |
|
|
nchanged = 0; |
| 369 |
|
|
for (i = 1; i <= nbeams(hp); i++) |
| 370 |
|
|
nchanged += hdfreebeam(hp, i); |
| 371 |
|
|
return(nchanged); |
| 372 |
|
|
} |
| 373 |
|
|
if (i < 1 | i > nbeams(hp)) |
| 374 |
|
|
error(CONSISTENCY, "bad beam index to hdfreebeam"); |
| 375 |
|
|
if (hp->bl[i] == NULL) |
| 376 |
|
|
return(0); |
| 377 |
|
|
/* check for additions */ |
| 378 |
|
|
nchanged = hp->bl[i]->nrm - hp->bi[i].nrd; |
| 379 |
|
|
if (nchanged) { |
| 380 |
|
|
hdgetbi(hp, i); /* allocate a file position */ |
| 381 |
|
|
errno = 0; |
| 382 |
|
|
if (lseek(hp->fd, hp->bi[i].fo, 0) < 0) |
| 383 |
|
|
error(SYSTEM, "cannot seek on holodeck file"); |
| 384 |
|
|
n = hp->bl[i]->nrm * sizeof(RAYVAL); |
| 385 |
|
|
if (write(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) |
| 386 |
|
|
error(SYSTEM, "write error in hdfreebeam"); |
| 387 |
|
|
} |
| 388 |
|
|
blglob(hp)->nrm -= hp->bl[i]->nrm; |
| 389 |
|
|
free((char *)hp->bl[i]); /* free memory */ |
| 390 |
|
|
hp->bl[i] = NULL; |
| 391 |
|
|
return(nchanged); |
| 392 |
|
|
} |
| 393 |
|
|
|
| 394 |
|
|
|
| 395 |
|
|
hdlrulist(ha, ba, n, hp) /* add beams from holodeck to LRU list */ |
| 396 |
|
|
register HOLO *ha[]; /* section list (NULL terminated) */ |
| 397 |
|
|
register int ba[]; /* beam index to go with section */ |
| 398 |
|
|
int n; /* length of arrays minus 1 */ |
| 399 |
|
|
register HOLO *hp; /* section we're adding from */ |
| 400 |
|
|
{ |
| 401 |
|
|
register int i, j; |
| 402 |
|
|
int nents; |
| 403 |
|
|
/* find last entry in LRU list */ |
| 404 |
|
|
for (j = 0; ha[j] != NULL; j++) |
| 405 |
|
|
; |
| 406 |
|
|
nents = j; |
| 407 |
|
|
/* insert each beam from hp */ |
| 408 |
|
|
for (i = nbeams(hp); i > 0; i-- ) { |
| 409 |
|
|
if (hp->bl[i] == NULL) /* check if loaded */ |
| 410 |
|
|
continue; |
| 411 |
|
|
if ((j = ++nents) > n) /* grow list if we can */ |
| 412 |
|
|
nents--; |
| 413 |
|
|
for ( ; ; ) { /* bubble into place */ |
| 414 |
|
|
if (!--j || hp->bl[i]->tick >= |
| 415 |
|
|
ha[j-1]->bl[ba[j-1]]->tick) { |
| 416 |
|
|
ha[j] = hp; |
| 417 |
|
|
ba[j] = i; |
| 418 |
|
|
break; |
| 419 |
|
|
} |
| 420 |
|
|
ha[j] = ha[j-1]; |
| 421 |
|
|
ba[j] = ba[j-1]; |
| 422 |
|
|
} |
| 423 |
|
|
} |
| 424 |
|
|
ha[nents] = NULL; /* all done */ |
| 425 |
|
|
ba[nents] = 0; |
| 426 |
|
|
} |
| 427 |
|
|
|
| 428 |
|
|
|
| 429 |
|
|
hdfreecache(pct, honly) /* free up cache space, writing changes */ |
| 430 |
|
|
int pct; /* maximum percentage to free */ |
| 431 |
|
|
register HOLO *honly; /* NULL means check all */ |
| 432 |
|
|
{ |
| 433 |
|
|
HOLO *hp[FREEBEAMS+1]; |
| 434 |
|
|
int bn[FREEBEAMS+1]; |
| 435 |
|
|
int freetarget; |
| 436 |
|
|
register int i; |
| 437 |
|
|
/* compute free target */ |
| 438 |
|
|
freetarget = (honly != NULL) ? blglob(honly)->nrm : |
| 439 |
|
|
hdmemuse(0)/sizeof(RAYVAL) ; |
| 440 |
|
|
freetarget = freetarget*pct/100; |
| 441 |
|
|
/* find least recently used */ |
| 442 |
|
|
hp[0] = NULL; |
| 443 |
|
|
bn[0] = 0; |
| 444 |
|
|
if (honly != NULL) |
| 445 |
|
|
hdlrulist(hp, bn, FREEBEAMS, honly); |
| 446 |
|
|
else |
| 447 |
|
|
for (i = 0; hdlist[i] != NULL; i++) |
| 448 |
|
|
hdlrulist(hp, bn, FREEBEAMS, hdlist[i]); |
| 449 |
|
|
/* free LRU beams */ |
| 450 |
|
|
for (i = 0; hp[i] != NULL; i++) { |
| 451 |
|
|
hdfreebeam(hp[i], bn[i]); |
| 452 |
|
|
if ((freetarget -= hp[i]->bi[bn[i]].nrd) <= 0) |
| 453 |
|
|
break; |
| 454 |
|
|
} |
| 455 |
|
|
hdsync(honly); /* synchronize directories as necessary */ |
| 456 |
|
|
} |
| 457 |
|
|
|
| 458 |
|
|
|
| 459 |
|
|
hddone(hp) /* clean up holodeck section and free */ |
| 460 |
|
|
register HOLO *hp; /* NULL means clean up all */ |
| 461 |
|
|
{ |
| 462 |
|
|
register int i; |
| 463 |
|
|
|
| 464 |
|
|
if (hp == NULL) { /* NULL means clean up everything */ |
| 465 |
|
|
while (hdlist[0] != NULL) |
| 466 |
|
|
hddone(hdlist[0]); |
| 467 |
|
|
return; |
| 468 |
|
|
} |
| 469 |
|
|
/* flush all data and free memory */ |
| 470 |
|
|
hdflush(hp); |
| 471 |
|
|
/* release fragment resources */ |
| 472 |
|
|
hdrelease(hp->fd); |
| 473 |
|
|
/* remove hp from active list */ |
| 474 |
|
|
for (i = 0; hdlist[i] != NULL; i++) |
| 475 |
|
|
if (hdlist[i] == hp) { |
| 476 |
|
|
while ((hdlist[i] = hdlist[i+1]) != NULL) |
| 477 |
|
|
i++; |
| 478 |
|
|
break; |
| 479 |
|
|
} |
| 480 |
|
|
free((char *)hp->bl); /* free beam list */ |
| 481 |
|
|
free((char *)hp); /* free holodeck struct */ |
| 482 |
|
|
} |
