22 |
|
#define PCTFREE 15 /* maximum fraction to free (%) */ |
23 |
|
#endif |
24 |
|
#ifndef MAXFRAG |
25 |
< |
#define MAXFRAG 32767 /* maximum fragments/file to track (0==inf) */ |
25 |
> |
#define MAXFRAG 8191 /* maximum fragments/file to track (0==inf) */ |
26 |
|
#endif |
27 |
+ |
#ifndef MINDIRSEL |
28 |
+ |
/* minimum directory seek length */ |
29 |
+ |
#define MINDIRSEL (4*BUFSIZ/sizeof(BEAMI)) |
30 |
+ |
#endif |
31 |
|
|
32 |
|
#ifndef BSD |
33 |
|
#define write writebuf /* safe i/o routines */ |
107 |
|
} |
108 |
|
|
109 |
|
|
106 |
– |
markdirty(hp) /* mark holodeck section directory dirty */ |
107 |
– |
register HOLO *hp; |
108 |
– |
{ |
109 |
– |
static BEAMI smudge = {0, -1}; |
110 |
– |
|
111 |
– |
if (hp->dirty) /* already marked? */ |
112 |
– |
return; |
113 |
– |
hp->dirty = 1; |
114 |
– |
if (lseek(hp->fd, biglob(hp)->fo+(nbeams(hp)-1)*sizeof(BEAMI), 0) < 0 |
115 |
– |
|| write(hp->fd, (char *)&smudge, |
116 |
– |
sizeof(BEAMI)) != sizeof(BEAMI)) |
117 |
– |
error(SYSTEM, "seek/write error in markdirty"); |
118 |
– |
} |
119 |
– |
|
120 |
– |
|
110 |
|
HOLO * |
111 |
|
hdinit(fd, hproto) /* initialize a holodeck section in a file */ |
112 |
|
int fd; /* corresponding file descriptor */ |
133 |
|
if (read(fd, (char *)(hp->bi+1), n) != n) |
134 |
|
error(SYSTEM, "failure loading holodeck directory"); |
135 |
|
/* check that it's clean */ |
136 |
< |
if (hp->bi[nbeams(hp)].fo < 0) |
137 |
< |
error(WARNING, "dirty holodeck section"); |
136 |
> |
for (n = nbeams(hp); n > 0; n--) |
137 |
> |
if (hp->bi[n].fo < 0) { |
138 |
> |
hp->bi[n].fo = 0; |
139 |
> |
error(WARNING, "dirty holodeck section"); |
140 |
> |
break; |
141 |
> |
} |
142 |
|
} else { /* assume we're creating it */ |
143 |
|
if ((hp = hdalloc(hproto)) == NULL) |
144 |
|
goto memerr; |
182 |
|
} |
183 |
|
|
184 |
|
|
185 |
+ |
markdirty(hp, i) /* mark holodeck directory position dirty */ |
186 |
+ |
register HOLO *hp; |
187 |
+ |
int i; |
188 |
+ |
{ |
189 |
+ |
static BEAMI smudge = {0, -1}; |
190 |
+ |
int mindist, minpos; |
191 |
+ |
register int j; |
192 |
+ |
|
193 |
+ |
if (!hp->dirty++) { /* write smudge first time */ |
194 |
+ |
if (lseek(hp->fd, biglob(hp)->fo+(i-1)*sizeof(BEAMI), 0) < 0 |
195 |
+ |
|| write(hp->fd, (char *)&smudge, |
196 |
+ |
sizeof(BEAMI)) != sizeof(BEAMI)) |
197 |
+ |
error(SYSTEM, "seek/write error in markdirty"); |
198 |
+ |
hp->dirseg[0].s = i; |
199 |
+ |
hp->dirseg[0].n = 1; |
200 |
+ |
return; |
201 |
+ |
} |
202 |
+ |
/* insert into segment list */ |
203 |
+ |
for (j = hp->dirty; j--; ) { |
204 |
+ |
if (!j || hp->dirseg[j-1].s < i) { |
205 |
+ |
hp->dirseg[j].s = i; |
206 |
+ |
hp->dirseg[j].n = 1; |
207 |
+ |
break; |
208 |
+ |
} |
209 |
+ |
copystruct(hp->dirseg+j, hp->dirseg+(j-1)); |
210 |
+ |
} |
211 |
+ |
do { /* check neighbors */ |
212 |
+ |
mindist = nbeams(hp); /* find closest */ |
213 |
+ |
for (j = hp->dirty; --j; ) |
214 |
+ |
if (hp->dirseg[j].s - |
215 |
+ |
(hp->dirseg[j-1].s + hp->dirseg[j-1].n) |
216 |
+ |
< mindist) { |
217 |
+ |
minpos = j; |
218 |
+ |
mindist = hp->dirseg[j].s - |
219 |
+ |
(hp->dirseg[j-1].s + hp->dirseg[j-1].n); |
220 |
+ |
} |
221 |
+ |
/* good enough? */ |
222 |
+ |
if (hp->dirty <= MAXDIRSE && mindist > MINDIRSEL) |
223 |
+ |
break; |
224 |
+ |
j = minpos - 1; /* coalesce neighbors */ |
225 |
+ |
if (hp->dirseg[j].s + hp->dirseg[j].n < |
226 |
+ |
hp->dirseg[minpos].s + hp->dirseg[minpos].n) |
227 |
+ |
hp->dirseg[j].n = hp->dirseg[minpos].s + |
228 |
+ |
hp->dirseg[minpos].n - hp->dirseg[j].s; |
229 |
+ |
hp->dirty--; |
230 |
+ |
while (++j < hp->dirty) /* close the gap */ |
231 |
+ |
copystruct(hp->dirseg+j, hp->dirseg+(j+1)); |
232 |
+ |
} while (mindist <= MINDIRSEL); |
233 |
+ |
} |
234 |
+ |
|
235 |
+ |
|
236 |
|
int |
237 |
|
hdsync(hp, all) /* update beams and directory on disk */ |
238 |
|
register HOLO *hp; |
252 |
|
hdsyncbeam(hp, j); |
253 |
|
if (!hp->dirty) /* directory clean? */ |
254 |
|
return(0); |
255 |
< |
errno = 0; |
256 |
< |
if (lseek(hp->fd, biglob(hp)->fo, 0) < 0) |
257 |
< |
error(SYSTEM, "cannot seek on holodeck file"); |
258 |
< |
n = nbeams(hp)*sizeof(BEAMI); |
259 |
< |
if (write(hp->fd, (char *)(hp->bi+1), n) != n) |
260 |
< |
error(SYSTEM, "cannot update holodeck section directory"); |
261 |
< |
hp->dirty = 0; |
255 |
> |
errno = 0; /* write dirty segments */ |
256 |
> |
for (j = 0; j < hp->dirty; j++) { |
257 |
> |
if (lseek(hp->fd, biglob(hp)->fo + |
258 |
> |
(hp->dirseg[j].s-1)*sizeof(BEAMI), 0) < 0) |
259 |
> |
error(SYSTEM, "cannot seek on holodeck file"); |
260 |
> |
n = hp->dirseg[j].n * sizeof(BEAMI); |
261 |
> |
if (write(hp->fd, (char *)(hp->bi+hp->dirseg[j].s), n) != n) |
262 |
> |
error(SYSTEM, "cannot update section directory"); |
263 |
> |
} |
264 |
> |
hp->dirty = 0; /* all clean */ |
265 |
|
return(1); |
266 |
|
} |
267 |
|
|
614 |
|
hp->bi[i].fo = 0L; |
615 |
|
biglob(hp)->nrd += nrays - hp->bi[i].nrd; |
616 |
|
hp->bi[i].nrd = nrays; |
617 |
< |
markdirty(hp); /* section directory now out of date */ |
617 |
> |
markdirty(hp, i); /* section directory now out of date */ |
618 |
|
return(1); |
619 |
|
} |
620 |
|
|