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* 9/30/97 GWLarson |
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*/ |
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#include "copyright.h" |
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#include <string.h> |
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#include "holo.h" |
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#ifndef CACHESIZE |
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short writable; /* 0 read-only, <0 write error encountered */ |
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int nfrags; /* number of known fragments */ |
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BEAMI *fi; /* fragments, descending file position */ |
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long flen; /* last known file length */ |
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off_t flen; /* last known file length */ |
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} *hdfragl; /* fragment lists, indexed by file descriptor */ |
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|
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static int nhdfragls; /* size of hdfragl array */ |
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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((void *)hproto, (void *)&hdhead, sizeof(HDGRID)); |
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memcpy((void *)&hdhead, (void *)hproto, 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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free((void *)hp); |
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return(NULL); |
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} |
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bzero((void *)hp->bl, (nbeams(hp)+1)*sizeof(BEAM *)+sizeof(BEAM)); |
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memset((void *)hp->bl, '\0', (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((void *)hp->bi, (nbeams(hp)+1)*sizeof(BEAMI)); |
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memset((void *)hp->bi, '\0', (nbeams(hp)+1)*sizeof(BEAMI)); |
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return(hp); /* all is well */ |
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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((void *)(hdfragl+nhdfragls), |
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(fd+1-nhdfragls)*sizeof(struct fraglist)); |
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memset((void *)(hdfragl+nhdfragls), |
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'\0', (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, (off_t)0L, 2); /* get file length */ |
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hdfragl[fd].flen = lseek(fd, (off_t)0, 2); /* get file length */ |
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} |
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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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off_t rtrunc; |
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off_t 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, (off_t)0L, 1)) < 0) |
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if ((fpos = lseek(fd, (off_t)0, 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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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, (off_t)fpos, 0) == fpos && |
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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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register int j; |
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if (!hp->dirty++) { /* write smudge first time */ |
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if (lseek(hp->fd, (off_t)(biglob(hp)->fo+(i-1)*sizeof(BEAMI)), 0) < 0 |
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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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return(0); |
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errno = 0; /* write dirty segments */ |
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for (j = 0; j < hp->dirty; j++) { |
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if (lseek(hp->fd, (off_t)(biglob(hp)->fo + |
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(hp->dirseg[j].s-1)*sizeof(BEAMI)), 0) < 0) |
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if (lseek(hp->fd, biglob(hp)->fo + |
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(hp->dirseg[j].s-1)*sizeof(BEAMI), 0) < 0) |
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error(SYSTEM, "cannot seek on holodeck file"); |
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n = hp->dirseg[j].n * sizeof(BEAMI); |
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if (write(hp->fd, (char *)(hp->bi+hp->dirseg[j].s), n) != n) |
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} |
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long |
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off_t |
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hdfilen(fd) /* return file length for fd */ |
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int fd; |
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{ |
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long fpos, flen; |
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off_t fpos, flen; |
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if (fd < 0) |
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return(-1); |
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if (fd >= nhdfragls || !hdfragl[fd].nlinks) { |
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if ((fpos = lseek(fd, (off_t)0L, 1)) < 0) |
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if ((fpos = lseek(fd, (off_t)0, 1)) < 0) |
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return(-1); |
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flen = lseek(fd, (off_t)0L, 2); |
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lseek(fd, (off_t)fpos, 0); |
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flen = lseek(fd, (off_t)0, 2); |
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lseek(fd, fpos, 0); |
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return(flen); |
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} |
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return(hdfragl[fd].flen); |
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} |
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long |
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off_t |
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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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off_t 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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blglob(hp)->nrm += n; |
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if ((n = hp->bl[i]->nrm = hp->bi[i].nrd)) { |
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errno = 0; |
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if (lseek(hp->fd, (off_t)hp->bi[i].fo, 0) < 0) |
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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) |
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hdfreefrag(hp, i); /* relinquish old fragment */ |
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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((void *)p, nr*sizeof(RAYVAL)); |
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memset((void *)p, '\0', nr*sizeof(RAYVAL)); |
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blglob(hp)->tick = hp->bl[i]->tick = hdclock++; /* update LRU clock */ |
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return(p); /* point to new rays */ |
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} |
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hp->bl[i] = (BEAM *)hdrealloc(NULL, hdbsiz(n), "hdgetbeam"); |
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blglob(hp)->nrm += hp->bl[i]->nrm = n; |
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errno = 0; |
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if (lseek(hp->fd, (off_t)hp->bi[i].fo, 0) < 0) |
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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) |
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hdfilord(hb1, hb2) /* order beams for quick loading */ |
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register HDBEAMI *hb1, *hb2; |
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{ |
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register long c; |
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register off_t c; |
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/* residents go first */ |
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if (hb2->h->bl[hb2->b] != NULL) |
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return(hb1->h->bl[hb1->b] == NULL); |
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if (hb1->h->bl[hb1->b] != NULL) |
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return(-1); |
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/* otherwise sort by file descriptor */ |
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if ((c = hb1->h->fd - hb2->h->fd)) |
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return(c); |
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if (hb1->h->fd != hb2->h->fd) |
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return(hb1->h->fd - hb2->h->fd); |
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/* then by position in file */ |
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c = hb1->h->bi[hb1->b].fo - hb2->h->bi[hb2->b].fo; |
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return(c > 0 ? 1 : c < 0 ? -1 : 0); |
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hdloadbeams(hb, n, bf) /* load a list of beams in optimal order */ |
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register HDBEAMI *hb; /* list gets sorted by hdfilord() */ |
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int n; /* list length */ |
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int (*bf)(); /* callback function (optional) */ |
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void (*bf)(); /* callback function (optional) */ |
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{ |
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unsigned origcachesize, memuse; |
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int bytesloaded, needbytes, bytes2free; |
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} |
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biglob(hp)->nrd -= bi->nrd; /* tell fragment it's free */ |
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bi->nrd = 0; |
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bi->fo = 0L; |
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bi->fo = 0; |
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hdmarkdirty(hp, i); /* assume we'll reallocate */ |
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return(1); |
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} |
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hdfragOK(fd, listlen, listsiz) /* get fragment list status for file */ |
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int fd; |
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int *listlen; |
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register int4 *listsiz; |
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register int32 *listsiz; |
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{ |
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register struct fraglist *f; |
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register int i; |
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} |
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long |
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off_t |
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hdallocfrag(fd, nrays) /* allocate a file fragment */ |
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int fd; |
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unsigned int4 nrays; |
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uint32 nrays; |
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{ |
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register struct fraglist *f; |
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register int j; |
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long nfo; |
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off_t nfo; |
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if (nrays == 0) |
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return(-1L); |
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register int i; |
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{ |
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int fragfreed; |
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unsigned int4 nrays; |
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uint32 nrays; |
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unsigned int n; |
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long nfo; |
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off_t nfo; |
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/* check file status */ |
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if (hdfragl[hp->fd].writable <= 0) |
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return(hdfragl[hp->fd].writable); |
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if (nrays) { /* get and write new fragment */ |
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nfo = hdallocfrag(hp->fd, nrays); |
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errno = 0; |
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if (lseek(hp->fd, (off_t)nfo, 0) < 0) |
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if (lseek(hp->fd, nfo, 0) < 0) |
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error(SYSTEM, "cannot seek on holodeck file"); |
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n = hp->bl[i]->nrm * sizeof(RAYVAL); |
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if (write(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) { |
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} |
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hp->bi[i].fo = nfo; |
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} else |
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hp->bi[i].fo = 0L; |
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hp->bi[i].fo = 0; |
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biglob(hp)->nrd += nrays - hp->bi[i].nrd; |
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hp->bi[i].nrd = nrays; |
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if (!fragfreed) |
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if (hp->bi[i].nrd && !(hdfragflags&FF_KILL && hdfreefrag(hp,i))) { |
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biglob(hp)->nrd -= hp->bi[i].nrd; /* free failed */ |
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hp->bi[i].nrd = 0; |
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hp->bi[i].fo = 0L; |
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hp->bi[i].fo = 0; |
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hdmarkdirty(hp, i); |
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} |
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return(nchanged); |