1 |
< |
/* Copyright (c) 1999 Silicon Graphics, Inc. */ |
1 |
> |
/* Copyright (c) 1999 Regents of the University of California */ |
2 |
|
|
3 |
|
#ifndef lint |
4 |
|
static char SCCSid[] = "$SunId$ SGI"; |
52 |
|
|
53 |
|
static struct fraglist { |
54 |
|
short nlinks; /* number of holodeck sections using us */ |
55 |
< |
short writerr; /* write error encountered */ |
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 */ |
119 |
|
} |
120 |
|
|
121 |
|
|
122 |
< |
hdattach(fd) /* start tracking file fragments for some section */ |
122 |
> |
hdattach(fd, wr) /* start tracking file fragments for some section */ |
123 |
|
register int fd; |
124 |
+ |
int wr; |
125 |
|
{ |
126 |
|
if (fd >= nhdfragls) { |
127 |
|
hdfragl = (struct fraglist *)hdrealloc((char *)hdfragl, |
131 |
|
nhdfragls = fd+1; |
132 |
|
} |
133 |
|
hdfragl[fd].nlinks++; |
134 |
+ |
hdfragl[fd].writable = wr; /* set writable flag */ |
135 |
|
hdfragl[fd].flen = lseek(fd, 0L, 2); /* get file length */ |
136 |
|
} |
137 |
|
|
159 |
|
{ |
160 |
|
long rtrunc; |
161 |
|
long fpos; |
162 |
+ |
int writable; |
163 |
|
register HOLO *hp; |
164 |
|
register int n; |
165 |
|
/* prepare for system errors */ |
185 |
|
error(WARNING, "dirty holodeck section"); |
186 |
|
break; |
187 |
|
} |
188 |
< |
} else { /* assume we're creating it */ |
188 |
> |
/* check writability */ |
189 |
> |
if (fd < nhdfragls && hdfragl[fd].nlinks) |
190 |
> |
writable = hdfragl[fd].writable; |
191 |
> |
else |
192 |
> |
writable = lseek(fd, fpos, 0) == fpos && |
193 |
> |
write(fd, (char *)hp, sizeof(HDGRID)) == |
194 |
> |
sizeof(HDGRID); |
195 |
> |
} else { /* else assume we're creating it */ |
196 |
|
if ((hp = hdalloc(hproto)) == NULL) |
197 |
|
goto memerr; |
198 |
|
/* write header and skeleton */ |
201 |
|
sizeof(HDGRID) || |
202 |
|
write(fd, (char *)(hp->bi+1), n) != n) |
203 |
|
error(SYSTEM, "cannot write header to holodeck file"); |
204 |
+ |
writable = 1; |
205 |
|
} |
206 |
|
hp->fd = fd; |
207 |
|
hp->dirty = 0; |
208 |
|
biglob(hp)->fo = fpos + sizeof(HDGRID); |
209 |
|
/* start tracking fragments */ |
210 |
< |
hdattach(fd); |
210 |
> |
hdattach(fd, writable); |
211 |
|
/* check rays on disk */ |
212 |
|
fpos = hdfilen(fd); |
213 |
|
biglob(hp)->nrd = rtrunc = 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) |
674 |
|
unsigned int n; |
675 |
|
long nfo; |
676 |
|
/* check file status */ |
677 |
< |
if (hdfragl[hp->fd].writerr) |
678 |
< |
return(-1); |
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? */ |
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].writerr++; |
693 |
> |
hdfragl[hp->fd].writable = -1; |
694 |
|
hdsync(NULL, 0); /* sync directories */ |
695 |
|
error(SYSTEM, "write error in hdsyncbeam"); |
696 |
|
} |
718 |
|
nchanged += hdfreebeam(hdlist[i], 0); |
719 |
|
return(nchanged); |
720 |
|
} |
721 |
< |
if (hdfragl[hp->fd].writerr) /* check for file error */ |
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) |
771 |
|
CONSISTENCY, "bad beam count in hdkillbeam"); |
772 |
|
return(nchanged); |
773 |
|
} |
774 |
< |
DCHECK(i < 1 | i > nbeams(hp), |
775 |
< |
CONSISTENCY, "bad beam index to hdkillbeam"); |
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]); |