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/* Copyright (c) 1999 Regents of the University of California */ |
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|
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#ifndef lint |
4 |
static char SCCSid[] = "$SunId$ SGI"; |
5 |
#endif |
6 |
|
7 |
/* |
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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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|
13 |
#include "holo.h" |
14 |
|
15 |
#ifndef CACHESIZE |
16 |
#ifdef BIGMEM |
17 |
#define CACHESIZE 17 /* default cache size (Mbytes, 0==inf) */ |
18 |
#else |
19 |
#define CACHESIZE 5 |
20 |
#endif |
21 |
#endif |
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#ifndef FREEBEAMS |
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#define FREEBEAMS 1500 /* maximum beams to free at a time */ |
24 |
#endif |
25 |
#ifndef PCTFREE |
26 |
#define PCTFREE 15 /* maximum fraction to free (%) */ |
27 |
#endif |
28 |
#ifndef MAXFRAGB |
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#define MAXFRAGB 16 /* fragment blocks/file to track (0==inf) */ |
30 |
#endif |
31 |
#ifndef FF_DEFAULT |
32 |
/* when to free a beam fragment */ |
33 |
#define FF_DEFAULT (FF_WRITE|FF_KILL) |
34 |
#endif |
35 |
#ifndef MINDIRSEL |
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/* minimum directory seek length */ |
37 |
#define MINDIRSEL (4*BUFSIZ/sizeof(BEAMI)) |
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#endif |
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|
40 |
#ifndef BSD |
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#define write writebuf /* safe i/o routines */ |
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#define read readbuf |
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#endif |
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|
45 |
#define FRAGBLK 512 /* number of fragments to allocate at a time */ |
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|
47 |
int hdfragflags = FF_DEFAULT; /* tells when to free fragments */ |
48 |
unsigned hdcachesize = CACHESIZE*1024*1024; /* target cache size */ |
49 |
unsigned long hdclock; /* clock value */ |
50 |
|
51 |
HOLO *hdlist[HDMAX+1]; /* holodeck pointers (NULL term.) */ |
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|
53 |
static struct fraglist { |
54 |
short nlinks; /* number of holodeck sections using us */ |
55 |
short writable; /* 0 read-only, <0 write error encountered */ |
56 |
int nfrags; /* number of known fragments */ |
57 |
BEAMI *fi; /* fragments, descending file position */ |
58 |
long flen; /* last known file length */ |
59 |
} *hdfragl; /* fragment lists, indexed by file descriptor */ |
60 |
|
61 |
static int nhdfragls; /* size of hdfragl array */ |
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|
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|
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HOLO * |
65 |
hdalloc(hproto) /* allocate and set holodeck section based on grid */ |
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HDGRID *hproto; |
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{ |
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HOLO hdhead; |
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register HOLO *hp; |
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int n; |
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/* copy grid to temporary header */ |
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bcopy((char *)hproto, (char *)&hdhead, sizeof(HDGRID)); |
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/* compute grid vectors and sizes */ |
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hdcompgrid(&hdhead); |
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/* allocate header with directory */ |
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n = sizeof(HOLO)+nbeams(&hdhead)*sizeof(BEAMI); |
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if ((hp = (HOLO *)malloc(n)) == NULL) |
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return(NULL); |
79 |
/* copy header information */ |
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copystruct(hp, &hdhead); |
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/* allocate and clear beam list */ |
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hp->bl = (BEAM **)malloc((nbeams(hp)+1)*sizeof(BEAM *)+sizeof(BEAM)); |
83 |
if (hp->bl == NULL) { |
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free((char *)hp); |
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return(NULL); |
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} |
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bzero((char *)hp->bl, (nbeams(hp)+1)*sizeof(BEAM *)+sizeof(BEAM)); |
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hp->bl[0] = (BEAM *)(hp->bl+nbeams(hp)+1); /* set blglob(hp) */ |
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hp->fd = -1; |
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hp->dirty = 0; |
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hp->priv = NULL; |
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/* clear beam directory */ |
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bzero((char *)hp->bi, (nbeams(hp)+1)*sizeof(BEAMI)); |
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return(hp); /* all is well */ |
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} |
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|
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|
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char * |
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hdrealloc(ptr, siz, rout) /* (re)allocate memory, retry then error */ |
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char *ptr; |
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unsigned siz; |
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char *rout; |
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{ |
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register char *newp; |
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/* call malloc/realloc */ |
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if (ptr == NULL) newp = (char *)malloc(siz); |
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else newp = (char *)realloc(ptr, siz); |
108 |
/* check success */ |
109 |
if (newp == NULL && rout != NULL) { |
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hdfreecache(25, NULL); /* free some memory */ |
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errno = 0; /* retry */ |
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newp = hdrealloc(ptr, siz, NULL); |
113 |
if (newp == NULL) { /* give up and report error */ |
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sprintf(errmsg, "out of memory in %s", rout); |
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error(SYSTEM, errmsg); |
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} |
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} |
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return(newp); |
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} |
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|
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|
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hdattach(fd, wr) /* start tracking file fragments for some section */ |
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register int fd; |
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int wr; |
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{ |
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if (fd >= nhdfragls) { |
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hdfragl = (struct fraglist *)hdrealloc((char *)hdfragl, |
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(fd+1)*sizeof(struct fraglist), "hdattach"); |
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bzero((char *)(hdfragl+nhdfragls), |
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(fd+1-nhdfragls)*sizeof(struct fraglist)); |
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nhdfragls = fd+1; |
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} |
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hdfragl[fd].nlinks++; |
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hdfragl[fd].writable = wr; /* set writable flag */ |
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hdfragl[fd].flen = lseek(fd, 0L, 2); /* get file length */ |
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} |
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|
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|
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/* Do we need a routine to locate file fragments given known occupants? */ |
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|
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|
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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; |
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if (!--hdfragl[fd].nlinks && hdfragl[fd].nfrags) { |
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free((char *)hdfragl[fd].fi); |
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hdfragl[fd].fi = NULL; |
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hdfragl[fd].nfrags = 0; |
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} |
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} |
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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 rtrunc; |
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long fpos; |
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int writable; |
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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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/* 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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} |
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/* check writability */ |
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if (fd < nhdfragls && hdfragl[fd].nlinks) |
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writable = hdfragl[fd].writable; |
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else |
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writable = lseek(fd, fpos, 0) == fpos && |
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write(fd, (char *)hp, sizeof(HDGRID)) == |
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sizeof(HDGRID); |
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} else { /* 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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writable = 1; |
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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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/* start tracking fragments */ |
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hdattach(fd, writable); |
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/* check rays on disk */ |
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fpos = hdfilen(fd); |
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biglob(hp)->nrd = rtrunc = 0; |
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for (n = hproto == NULL ? nbeams(hp) : 0; n > 0; n--) |
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if (hp->bi[n].nrd) |
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if (hp->bi[n].fo+hp->bi[n].nrd*sizeof(RAYVAL) > fpos) { |
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rtrunc += hp->bi[n].nrd; |
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hp->bi[n].nrd = 0; |
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} else |
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biglob(hp)->nrd += hp->bi[n].nrd; |
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if (rtrunc) { |
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sprintf(errmsg, "truncated section, %ld rays lost (%.1f%%)", |
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rtrunc, 100.*rtrunc/(rtrunc+biglob(hp)->nrd)); |
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error(WARNING, errmsg); |
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} |
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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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/* 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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|
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|
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hdmarkdirty(hp, i) /* mark holodeck directory position dirty */ |
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register HOLO *hp; |
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int i; |
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{ |
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static BEAMI smudge = {0, -1}; |
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int mindist, minpos; |
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register int j; |
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|
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if (!hp->dirty++) { /* write smudge first time */ |
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if (lseek(hp->fd, biglob(hp)->fo+(i-1)*sizeof(BEAMI), 0) < 0 |
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|| write(hp->fd, (char *)&smudge, |
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sizeof(BEAMI)) != sizeof(BEAMI)) |
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error(SYSTEM, "seek/write error in hdmarkdirty"); |
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hp->dirseg[0].s = i; |
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hp->dirseg[0].n = 1; |
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return; |
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} |
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/* insert into segment list */ |
257 |
for (j = hp->dirty; j--; ) { |
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if (!j || hp->dirseg[j-1].s < i) { |
259 |
hp->dirseg[j].s = i; |
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hp->dirseg[j].n = 1; |
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break; |
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} |
263 |
copystruct(hp->dirseg+j, hp->dirseg+(j-1)); |
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} |
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do { /* check neighbors */ |
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mindist = nbeams(hp); /* find closest */ |
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for (j = hp->dirty; --j; ) |
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if (hp->dirseg[j].s - |
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(hp->dirseg[j-1].s + hp->dirseg[j-1].n) |
270 |
< mindist) { |
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minpos = j; |
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mindist = hp->dirseg[j].s - |
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(hp->dirseg[j-1].s + hp->dirseg[j-1].n); |
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} |
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/* good enough? */ |
276 |
if (hp->dirty <= MAXDIRSE && mindist > MINDIRSEL) |
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break; |
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j = minpos - 1; /* coalesce neighbors */ |
279 |
if (hp->dirseg[j].s + hp->dirseg[j].n < |
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hp->dirseg[minpos].s + hp->dirseg[minpos].n) |
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hp->dirseg[j].n = hp->dirseg[minpos].s + |
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hp->dirseg[minpos].n - hp->dirseg[j].s; |
283 |
hp->dirty--; |
284 |
while (++j < hp->dirty) /* close the gap */ |
285 |
copystruct(hp->dirseg+j, hp->dirseg+(j+1)); |
286 |
} while (mindist <= MINDIRSEL); |
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} |
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|
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|
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int |
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hdsync(hp, all) /* update beams and directory on disk */ |
292 |
register HOLO *hp; |
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int all; |
294 |
{ |
295 |
register int j, n; |
296 |
|
297 |
if (hp == NULL) { /* do all holodecks */ |
298 |
n = 0; |
299 |
for (j = 0; hdlist[j] != NULL; j++) |
300 |
n += hdsync(hdlist[j], all); |
301 |
return(n); |
302 |
} |
303 |
/* sync the beams */ |
304 |
for (j = (all ? nbeams(hp) : 0); j > 0; j--) |
305 |
if (hp->bl[j] != NULL) |
306 |
hdsyncbeam(hp, j); |
307 |
if (!hp->dirty) /* directory clean? */ |
308 |
return(0); |
309 |
errno = 0; /* write dirty segments */ |
310 |
for (j = 0; j < hp->dirty; j++) { |
311 |
if (lseek(hp->fd, biglob(hp)->fo + |
312 |
(hp->dirseg[j].s-1)*sizeof(BEAMI), 0) < 0) |
313 |
error(SYSTEM, "cannot seek on holodeck file"); |
314 |
n = hp->dirseg[j].n * sizeof(BEAMI); |
315 |
if (write(hp->fd, (char *)(hp->bi+hp->dirseg[j].s), n) != n) |
316 |
error(SYSTEM, "cannot update section directory"); |
317 |
} |
318 |
hp->dirty = 0; /* all clean */ |
319 |
return(1); |
320 |
} |
321 |
|
322 |
|
323 |
unsigned |
324 |
hdmemuse(all) /* return memory usage (in bytes) */ |
325 |
int all; /* include overhead (painful) */ |
326 |
{ |
327 |
long total = 0; |
328 |
register int i, j; |
329 |
|
330 |
for (j = 0; hdlist[j] != NULL; j++) { |
331 |
total += blglob(hdlist[j])->nrm * sizeof(RAYVAL); |
332 |
if (all) { |
333 |
total += sizeof(HOLO) + sizeof(BEAM *) + |
334 |
nbeams(hdlist[j]) * |
335 |
(sizeof(BEAM *)+sizeof(BEAMI)); |
336 |
for (i = nbeams(hdlist[j]); i > 0; i--) |
337 |
if (hdlist[j]->bl[i] != NULL) |
338 |
total += sizeof(BEAM); |
339 |
} |
340 |
} |
341 |
if (all) |
342 |
for (j = 0; j < nhdfragls; j++) { |
343 |
total += sizeof(struct fraglist); |
344 |
if (hdfragl[j].nfrags) |
345 |
total += FRAGBLK*sizeof(BEAMI) * |
346 |
((hdfragl[j].nfrags-1)/FRAGBLK + 1) ; |
347 |
} |
348 |
return(total); |
349 |
} |
350 |
|
351 |
|
352 |
long |
353 |
hdfilen(fd) /* return file length for fd */ |
354 |
int fd; |
355 |
{ |
356 |
long fpos, flen; |
357 |
|
358 |
if (fd < 0) |
359 |
return(-1); |
360 |
if (fd >= nhdfragls || !hdfragl[fd].nlinks) { |
361 |
if ((fpos = lseek(fd, 0L, 1)) < 0) |
362 |
return(-1); |
363 |
flen = lseek(fd, 0L, 2); |
364 |
lseek(fd, fpos, 0); |
365 |
return(flen); |
366 |
} |
367 |
return(hdfragl[fd].flen); |
368 |
} |
369 |
|
370 |
|
371 |
long |
372 |
hdfiluse(fd, all) /* compute file usage (in bytes) */ |
373 |
int fd; /* open file descriptor to check */ |
374 |
int all; /* include overhead and unflushed data */ |
375 |
{ |
376 |
long total = 0; |
377 |
register int i, j; |
378 |
|
379 |
for (j = 0; hdlist[j] != NULL; j++) { |
380 |
if (hdlist[j]->fd != fd) |
381 |
continue; |
382 |
total += biglob(hdlist[j])->nrd * sizeof(RAYVAL); |
383 |
if (all) { |
384 |
for (i = nbeams(hdlist[j]); i > 0; i--) |
385 |
if (hdlist[j]->bl[i] != NULL) |
386 |
total += sizeof(RAYVAL) * |
387 |
(hdlist[j]->bl[i]->nrm - |
388 |
hdlist[j]->bi[i].nrd); |
389 |
total += sizeof(HDGRID) + |
390 |
nbeams(hdlist[j])*sizeof(BEAMI); |
391 |
} |
392 |
} |
393 |
return(total); /* does not include fragments */ |
394 |
} |
395 |
|
396 |
|
397 |
RAYVAL * |
398 |
hdnewrays(hp, i, nr) /* allocate space for add'l rays and return pointer */ |
399 |
register HOLO *hp; |
400 |
register int i; |
401 |
int nr; /* number of new rays desired */ |
402 |
{ |
403 |
RAYVAL *p; |
404 |
int n; |
405 |
|
406 |
if (nr <= 0) return(NULL); |
407 |
CHECK(i < 1 | i > nbeams(hp), |
408 |
CONSISTENCY, "bad beam index given to hdnewrays"); |
409 |
if (hp->bl[i] != NULL) |
410 |
hp->bl[i]->tick = hdclock; /* preempt swap */ |
411 |
if (hdcachesize > 0 && hdmemuse(0) >= hdcachesize) |
412 |
hdfreecache(PCTFREE, NULL); /* free some space */ |
413 |
if (hp->bl[i] == NULL) { /* allocate (and load) */ |
414 |
n = hp->bi[i].nrd + nr; |
415 |
hp->bl[i] = (BEAM *)hdrealloc(NULL, hdbsiz(n), "hdnewrays"); |
416 |
blglob(hp)->nrm += n; |
417 |
if ((n = hp->bl[i]->nrm = hp->bi[i].nrd)) { |
418 |
errno = 0; |
419 |
if (lseek(hp->fd, hp->bi[i].fo, 0) < 0) |
420 |
error(SYSTEM, "seek error on holodeck file"); |
421 |
n *= sizeof(RAYVAL); |
422 |
if (read(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) |
423 |
error(SYSTEM, |
424 |
"error reading beam from holodeck file"); |
425 |
} |
426 |
} else { /* just grow in memory */ |
427 |
hp->bl[i] = (BEAM *)hdrealloc((char *)hp->bl[i], |
428 |
hdbsiz(hp->bl[i]->nrm + nr), "hdnewrays"); |
429 |
blglob(hp)->nrm += nr; |
430 |
} |
431 |
if (hdfragflags&FF_ALLOC && hp->bi[i].nrd) |
432 |
hdfreefrag(hp, i); /* relinquish old fragment */ |
433 |
p = hdbray(hp->bl[i]) + hp->bl[i]->nrm; |
434 |
hp->bl[i]->nrm += nr; /* update in-core structure */ |
435 |
bzero((char *)p, nr*sizeof(RAYVAL)); |
436 |
blglob(hp)->tick = hp->bl[i]->tick = hdclock++; /* update LRU clock */ |
437 |
return(p); /* point to new rays */ |
438 |
} |
439 |
|
440 |
|
441 |
BEAM * |
442 |
hdgetbeam(hp, i) /* get beam (from file if necessary) */ |
443 |
register HOLO *hp; |
444 |
register int i; |
445 |
{ |
446 |
register int n; |
447 |
|
448 |
CHECK(i < 1 | i > nbeams(hp), |
449 |
CONSISTENCY, "bad beam index given to hdgetbeam"); |
450 |
if (hp->bl[i] == NULL) { /* load from disk */ |
451 |
if (!(n = hp->bi[i].nrd)) |
452 |
return(NULL); |
453 |
if (hdcachesize > 0 && hdmemuse(0) >= hdcachesize) |
454 |
hdfreecache(PCTFREE, NULL); /* get free space */ |
455 |
hp->bl[i] = (BEAM *)hdrealloc(NULL, hdbsiz(n), "hdgetbeam"); |
456 |
blglob(hp)->nrm += hp->bl[i]->nrm = n; |
457 |
errno = 0; |
458 |
if (lseek(hp->fd, hp->bi[i].fo, 0) < 0) |
459 |
error(SYSTEM, "seek error on holodeck file"); |
460 |
n *= sizeof(RAYVAL); |
461 |
if (read(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) |
462 |
error(SYSTEM, "error reading beam from holodeck file"); |
463 |
if (hdfragflags&FF_READ) |
464 |
hdfreefrag(hp, i); /* relinquish old frag. */ |
465 |
} |
466 |
blglob(hp)->tick = hp->bl[i]->tick = hdclock++; /* update LRU clock */ |
467 |
return(hp->bl[i]); |
468 |
} |
469 |
|
470 |
|
471 |
int |
472 |
hdfilord(hb1, hb2) /* order beams for quick loading */ |
473 |
register HDBEAMI *hb1, *hb2; |
474 |
{ |
475 |
register long c; |
476 |
/* residents go first */ |
477 |
if (hb2->h->bl[hb2->b] != NULL) |
478 |
return(hb1->h->bl[hb1->b] == NULL); |
479 |
if (hb1->h->bl[hb1->b] != NULL) |
480 |
return(-1); |
481 |
/* otherwise sort by file descriptor */ |
482 |
if ((c = hb1->h->fd - hb2->h->fd)) |
483 |
return(c); |
484 |
/* then by position in file */ |
485 |
c = hb1->h->bi[hb1->b].fo - hb2->h->bi[hb2->b].fo; |
486 |
return(c > 0 ? 1 : c < 0 ? -1 : 0); |
487 |
} |
488 |
|
489 |
|
490 |
hdloadbeams(hb, n, bf) /* load a list of beams in optimal order */ |
491 |
register HDBEAMI *hb; /* list gets sorted by hdfilord() */ |
492 |
int n; /* list length */ |
493 |
int (*bf)(); /* callback function (optional) */ |
494 |
{ |
495 |
unsigned origcachesize, memuse; |
496 |
int bytesloaded, needbytes, bytes2free; |
497 |
register BEAM *bp; |
498 |
register int i; |
499 |
/* precheck consistency */ |
500 |
if (n <= 0) return; |
501 |
for (i = n; i--; ) |
502 |
if (hb[i].h==NULL || hb[i].b<1 | hb[i].b>nbeams(hb[i].h)) |
503 |
error(CONSISTENCY, "bad beam in hdloadbeams"); |
504 |
/* sort list for optimal access */ |
505 |
qsort((char *)hb, n, sizeof(HDBEAMI), hdfilord); |
506 |
bytesloaded = 0; /* run through loaded beams */ |
507 |
for ( ; n && (bp = hb->h->bl[hb->b]) != NULL; n--, hb++) { |
508 |
bp->tick = hdclock; /* preempt swap */ |
509 |
bytesloaded += bp->nrm; |
510 |
if (bf != NULL) |
511 |
(*bf)(bp, hb); |
512 |
} |
513 |
bytesloaded *= sizeof(RAYVAL); |
514 |
if ((origcachesize = hdcachesize) > 0) { |
515 |
needbytes = 0; /* figure out memory needs */ |
516 |
for (i = n; i--; ) |
517 |
needbytes += hb[i].h->bi[hb[i].b].nrd; |
518 |
needbytes *= sizeof(RAYVAL); |
519 |
do { /* free enough memory */ |
520 |
memuse = hdmemuse(0); |
521 |
bytes2free = needbytes - (int)(hdcachesize-memuse); |
522 |
if (bytes2free > (int)(memuse - bytesloaded)) |
523 |
bytes2free = memuse - bytesloaded; |
524 |
} while (bytes2free > 0 && |
525 |
hdfreecache(100*bytes2free/memuse, NULL) < 0); |
526 |
hdcachesize = 0; /* load beams w/o swap */ |
527 |
} |
528 |
for (i = 0; i < n; i++) |
529 |
if ((bp = hdgetbeam(hb[i].h, hb[i].b)) != NULL && bf != NULL) |
530 |
(*bf)(bp, hb+i); |
531 |
hdcachesize = origcachesize; /* resume dynamic swapping */ |
532 |
} |
533 |
|
534 |
|
535 |
int |
536 |
hdfreefrag(hp, i) /* free a file fragment */ |
537 |
HOLO *hp; |
538 |
int i; |
539 |
{ |
540 |
register BEAMI *bi = &hp->bi[i]; |
541 |
register struct fraglist *f; |
542 |
register int j, k; |
543 |
|
544 |
if (bi->nrd <= 0) |
545 |
return(0); |
546 |
DCHECK(hp->fd < 0 | hp->fd >= nhdfragls || !hdfragl[hp->fd].nlinks, |
547 |
CONSISTENCY, "bad file descriptor in hdfreefrag"); |
548 |
f = &hdfragl[hp->fd]; |
549 |
if (!f->writable) |
550 |
return(0); |
551 |
if (f->nfrags % FRAGBLK == 0) { /* delete empty remnants */ |
552 |
for (j = k = 0; k < f->nfrags; j++, k++) { |
553 |
while (f->fi[k].nrd == 0) |
554 |
if (++k >= f->nfrags) |
555 |
goto endloop; |
556 |
if (k > j) |
557 |
copystruct(f->fi+j, f->fi+k); |
558 |
} |
559 |
endloop: |
560 |
f->nfrags = j; |
561 |
} |
562 |
j = f->nfrags++; /* allocate a slot in free list */ |
563 |
#if MAXFRAGB |
564 |
if (j >= MAXFRAGB*FRAGBLK) { |
565 |
f->nfrags = j--; /* stop list growth */ |
566 |
if (bi->nrd <= f->fi[j].nrd) |
567 |
return(0); /* new one no better than discard */ |
568 |
} |
569 |
#endif |
570 |
if (j % FRAGBLK == 0) { /* more (or less) free list space */ |
571 |
register BEAMI *newp; |
572 |
if (f->fi == NULL) |
573 |
newp = (BEAMI *)malloc((j+FRAGBLK)*sizeof(BEAMI)); |
574 |
else |
575 |
newp = (BEAMI *)realloc((char *)f->fi, |
576 |
(j+FRAGBLK)*sizeof(BEAMI)); |
577 |
if (newp == NULL) { |
578 |
f->nfrags--; /* graceful failure */ |
579 |
return(0); |
580 |
} |
581 |
f->fi = newp; |
582 |
} |
583 |
for ( ; ; j--) { /* insert in descending list */ |
584 |
if (!j || bi->fo < f->fi[j-1].fo) { |
585 |
f->fi[j].fo = bi->fo; |
586 |
f->fi[j].nrd = bi->nrd; |
587 |
break; |
588 |
} |
589 |
copystruct(f->fi+j, f->fi+(j-1)); |
590 |
} |
591 |
/* coalesce adjacent fragments */ |
592 |
/* successors never empty */ |
593 |
if (j && f->fi[j-1].fo == f->fi[j].fo + f->fi[j].nrd*sizeof(RAYVAL)) { |
594 |
f->fi[j].nrd += f->fi[j-1].nrd; |
595 |
f->fi[j-1].nrd = 0; |
596 |
} |
597 |
for (k = j+1; k < f->nfrags; k++) /* get non-empty predecessor */ |
598 |
if (f->fi[k].nrd) { |
599 |
if (f->fi[j].fo == f->fi[k].fo + |
600 |
f->fi[k].nrd*sizeof(RAYVAL)) { |
601 |
f->fi[k].nrd += f->fi[j].nrd; |
602 |
f->fi[j].nrd = 0; |
603 |
} |
604 |
break; |
605 |
} |
606 |
biglob(hp)->nrd -= bi->nrd; /* tell fragment it's free */ |
607 |
bi->nrd = 0; |
608 |
bi->fo = 0L; |
609 |
hdmarkdirty(hp, i); /* assume we'll reallocate */ |
610 |
return(1); |
611 |
} |
612 |
|
613 |
|
614 |
int |
615 |
hdfragOK(fd, listlen, listsiz) /* get fragment list status for file */ |
616 |
int fd; |
617 |
int *listlen; |
618 |
register int4 *listsiz; |
619 |
{ |
620 |
register struct fraglist *f; |
621 |
register int i; |
622 |
|
623 |
if (fd < 0 | fd >= nhdfragls || !(f = &hdfragl[fd])->nlinks) |
624 |
return(0); /* listless */ |
625 |
if (listlen != NULL) |
626 |
*listlen = f->nfrags; |
627 |
if (listsiz != NULL) |
628 |
for (i = f->nfrags, *listsiz = 0; i--; ) |
629 |
*listsiz += f->fi[i].nrd; |
630 |
#if MAXFRAGB |
631 |
return(f->nfrags < MAXFRAGB*FRAGBLK); |
632 |
#else |
633 |
return(1); /* list never fills up */ |
634 |
#endif |
635 |
} |
636 |
|
637 |
|
638 |
long |
639 |
hdallocfrag(fd, nrays) /* allocate a file fragment */ |
640 |
int fd; |
641 |
unsigned int4 nrays; |
642 |
{ |
643 |
register struct fraglist *f; |
644 |
register int j; |
645 |
long nfo; |
646 |
|
647 |
if (nrays == 0) |
648 |
return(-1L); |
649 |
DCHECK(fd < 0 | fd >= nhdfragls || !hdfragl[fd].nlinks, |
650 |
CONSISTENCY, "bad file descriptor in hdallocfrag"); |
651 |
f = &hdfragl[fd]; |
652 |
for (j = f->nfrags; j-- > 0; ) /* first fit algorithm */ |
653 |
if (f->fi[j].nrd >= nrays) |
654 |
break; |
655 |
if (j < 0) { /* no fragment -- extend file */ |
656 |
nfo = f->flen; |
657 |
f->flen += nrays*sizeof(RAYVAL); |
658 |
} else { /* else use fragment */ |
659 |
nfo = f->fi[j].fo; |
660 |
f->fi[j].fo += nrays*sizeof(RAYVAL); |
661 |
f->fi[j].nrd -= nrays; |
662 |
} |
663 |
return(nfo); |
664 |
} |
665 |
|
666 |
|
667 |
int |
668 |
hdsyncbeam(hp, i) /* sync beam in memory with beam on disk */ |
669 |
register HOLO *hp; |
670 |
register int i; |
671 |
{ |
672 |
int fragfreed; |
673 |
unsigned int4 nrays; |
674 |
unsigned int n; |
675 |
long nfo; |
676 |
/* check file status */ |
677 |
if (hdfragl[hp->fd].writable <= 0) |
678 |
return(hdfragl[hp->fd].writable); |
679 |
DCHECK(i < 1 | i > nbeams(hp), |
680 |
CONSISTENCY, "bad beam index in hdsyncbeam"); |
681 |
/* is current fragment OK? */ |
682 |
if (hp->bl[i] == NULL || (nrays = hp->bl[i]->nrm) == hp->bi[i].nrd) |
683 |
return(0); |
684 |
/* relinquish old fragment? */ |
685 |
fragfreed = hdfragflags&FF_WRITE && hp->bi[i].nrd && hdfreefrag(hp,i); |
686 |
if (nrays) { /* get and write new fragment */ |
687 |
nfo = hdallocfrag(hp->fd, nrays); |
688 |
errno = 0; |
689 |
if (lseek(hp->fd, nfo, 0) < 0) |
690 |
error(SYSTEM, "cannot seek on holodeck file"); |
691 |
n = hp->bl[i]->nrm * sizeof(RAYVAL); |
692 |
if (write(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) { |
693 |
hdfragl[hp->fd].writable = -1; |
694 |
hdsync(NULL, 0); /* sync directories */ |
695 |
error(SYSTEM, "write error in hdsyncbeam"); |
696 |
} |
697 |
hp->bi[i].fo = nfo; |
698 |
} else |
699 |
hp->bi[i].fo = 0L; |
700 |
biglob(hp)->nrd += nrays - hp->bi[i].nrd; |
701 |
hp->bi[i].nrd = nrays; |
702 |
if (!fragfreed) |
703 |
hdmarkdirty(hp, i); /* need to flag dir. ent. */ |
704 |
return(1); |
705 |
} |
706 |
|
707 |
|
708 |
int |
709 |
hdfreebeam(hp, i) /* free beam, writing if dirty */ |
710 |
register HOLO *hp; |
711 |
register int i; |
712 |
{ |
713 |
int nchanged; |
714 |
|
715 |
if (hp == NULL) { /* clear all holodecks */ |
716 |
nchanged = 0; |
717 |
for (i = 0; hdlist[i] != NULL; i++) |
718 |
nchanged += hdfreebeam(hdlist[i], 0); |
719 |
return(nchanged); |
720 |
} |
721 |
if (hdfragl[hp->fd].writable < 0) /* check for file error */ |
722 |
return(0); |
723 |
if (i == 0) { /* clear entire holodeck */ |
724 |
if (blglob(hp)->nrm == 0) |
725 |
return(0); /* already clear */ |
726 |
nchanged = 0; |
727 |
for (i = nbeams(hp); i > 0; i--) |
728 |
if (hp->bl[i] != NULL) |
729 |
nchanged += hdfreebeam(hp, i); |
730 |
DCHECK(blglob(hp)->nrm != 0, |
731 |
CONSISTENCY, "bad beam count in hdfreebeam"); |
732 |
return(nchanged); |
733 |
} |
734 |
DCHECK(i < 1 | i > nbeams(hp), |
735 |
CONSISTENCY, "bad beam index to hdfreebeam"); |
736 |
if (hp->bl[i] == NULL) |
737 |
return(0); |
738 |
/* check for additions */ |
739 |
nchanged = hp->bl[i]->nrm - hp->bi[i].nrd; |
740 |
if (nchanged) |
741 |
hdsyncbeam(hp, i); /* write new fragment */ |
742 |
blglob(hp)->nrm -= hp->bl[i]->nrm; |
743 |
free((char *)hp->bl[i]); /* free memory */ |
744 |
hp->bl[i] = NULL; |
745 |
return(nchanged); |
746 |
} |
747 |
|
748 |
|
749 |
int |
750 |
hdkillbeam(hp, i) /* delete beam from holodeck */ |
751 |
register HOLO *hp; |
752 |
register int i; |
753 |
{ |
754 |
int nchanged; |
755 |
|
756 |
if (hp == NULL) { /* clobber all holodecks */ |
757 |
nchanged = 0; |
758 |
for (i = 0; hdlist[i] != NULL; i++) |
759 |
nchanged += hdkillbeam(hdlist[i], 0); |
760 |
return(nchanged); |
761 |
} |
762 |
if (i == 0) { /* clobber entire holodeck */ |
763 |
if (biglob(hp)->nrd == 0 & blglob(hp)->nrm == 0) |
764 |
return(0); /* already empty */ |
765 |
nchanged = 0; |
766 |
nchanged = 0; |
767 |
for (i = nbeams(hp); i > 0; i--) |
768 |
if (hp->bi[i].nrd > 0 || hp->bl[i] != NULL) |
769 |
nchanged += hdkillbeam(hp, i); |
770 |
DCHECK(biglob(hp)->nrd != 0 | blglob(hp)->nrm != 0, |
771 |
CONSISTENCY, "bad beam count in hdkillbeam"); |
772 |
return(nchanged); |
773 |
} |
774 |
DCHECK(i < 1 | i > nbeams(hp), CONSISTENCY, |
775 |
"bad beam index to hdkillbeam"); |
776 |
DCHECK(!hdfragl[hp->fd].writable, CONSISTENCY, |
777 |
"hdkillbeam called on read-only holodeck"); |
778 |
if (hp->bl[i] != NULL) { /* free memory */ |
779 |
blglob(hp)->nrm -= nchanged = hp->bl[i]->nrm; |
780 |
free((char *)hp->bl[i]); |
781 |
hp->bl[i] = NULL; |
782 |
} else |
783 |
nchanged = hp->bi[i].nrd; |
784 |
if (hp->bi[i].nrd && !(hdfragflags&FF_KILL && hdfreefrag(hp,i))) { |
785 |
biglob(hp)->nrd -= hp->bi[i].nrd; /* free failed */ |
786 |
hp->bi[i].nrd = 0; |
787 |
hp->bi[i].fo = 0L; |
788 |
hdmarkdirty(hp, i); |
789 |
} |
790 |
return(nchanged); |
791 |
} |
792 |
|
793 |
|
794 |
int |
795 |
hdlrulist(hb, nents, n, hp) /* add beams from holodeck to LRU list */ |
796 |
register HDBEAMI *hb; /* beam list */ |
797 |
int nents; /* current list length */ |
798 |
int n; /* maximum list length */ |
799 |
register HOLO *hp; /* section we're adding from */ |
800 |
{ |
801 |
register int i, j; |
802 |
/* insert each beam from hp */ |
803 |
for (i = 1; i <= nbeams(hp); i++) { |
804 |
if (hp->bl[i] == NULL) /* check if loaded */ |
805 |
continue; |
806 |
#if 0 |
807 |
if (hp->bl[i]->tick == hdclock) /* preempt swap? */ |
808 |
continue; |
809 |
#endif |
810 |
if ((j = ++nents) >= n) /* grow list if we can */ |
811 |
nents--; |
812 |
for ( ; ; ) { /* bubble into place */ |
813 |
if (!--j || hp->bl[i]->tick >= |
814 |
hb[j-1].h->bl[hb[j-1].b]->tick) { |
815 |
hb[j].h = hp; |
816 |
hb[j].b = i; |
817 |
break; |
818 |
} |
819 |
copystruct(hb+j, hb+(j-1)); |
820 |
} |
821 |
} |
822 |
return(nents); /* return new list length */ |
823 |
} |
824 |
|
825 |
|
826 |
int |
827 |
hdfreecache(pct, honly) /* free up cache space, writing changes */ |
828 |
int pct; /* maximum percentage to free */ |
829 |
register HOLO *honly; /* NULL means check all */ |
830 |
{ |
831 |
HDBEAMI hb[FREEBEAMS]; |
832 |
int freetarget; |
833 |
int n; |
834 |
register int i; |
835 |
#ifdef DEBUG |
836 |
unsigned membefore; |
837 |
|
838 |
membefore = hdmemuse(0); |
839 |
#endif |
840 |
/* compute free target */ |
841 |
freetarget = (honly != NULL) ? blglob(honly)->nrm : |
842 |
hdmemuse(0)/sizeof(RAYVAL) ; |
843 |
freetarget = freetarget*pct/100; |
844 |
if (freetarget <= 0) |
845 |
return(0); |
846 |
/* find least recently used */ |
847 |
n = 0; |
848 |
if (honly != NULL) |
849 |
n = hdlrulist(hb, n, FREEBEAMS, honly); |
850 |
else |
851 |
for (i = 0; hdlist[i] != NULL; i++) |
852 |
n = hdlrulist(hb, n, FREEBEAMS, hdlist[i]); |
853 |
/* free LRU beams */ |
854 |
for (i = 0; i < n; i++) { |
855 |
hdfreebeam(hb[i].h, hb[i].b); |
856 |
if ((freetarget -= hb[i].h->bi[hb[i].b].nrd) <= 0) |
857 |
break; |
858 |
} |
859 |
hdsync(honly, 0); /* synchronize directories as necessary */ |
860 |
#ifdef DEBUG |
861 |
sprintf(errmsg, |
862 |
"%dK before, %dK after hdfreecache (%dK total), %d rays short\n", |
863 |
membefore>>10, hdmemuse(0)>>10, hdmemuse(1)>>10, freetarget); |
864 |
wputs(errmsg); |
865 |
#endif |
866 |
return(-freetarget); /* return how far past goal we went */ |
867 |
} |
868 |
|
869 |
|
870 |
hddone(hp) /* clean up holodeck section and free */ |
871 |
register HOLO *hp; /* NULL means clean up all */ |
872 |
{ |
873 |
register int i; |
874 |
|
875 |
if (hp == NULL) { /* NULL means clean up everything */ |
876 |
while (hdlist[0] != NULL) |
877 |
hddone(hdlist[0]); |
878 |
free((char *)hdfragl); |
879 |
hdfragl = NULL; nhdfragls = 0; |
880 |
return; |
881 |
} |
882 |
/* flush all data and free memory */ |
883 |
hdflush(hp); |
884 |
/* release fragment resources */ |
885 |
hdrelease(hp->fd); |
886 |
/* remove hp from active list */ |
887 |
for (i = 0; hdlist[i] != NULL; i++) |
888 |
if (hdlist[i] == hp) { |
889 |
while ((hdlist[i] = hdlist[i+1]) != NULL) |
890 |
i++; |
891 |
break; |
892 |
} |
893 |
free((char *)hp->bl); /* free beam list */ |
894 |
free((char *)hp); /* free holodeck struct */ |
895 |
} |