1 e1dddc05 2004-06-17 devnull #include <u.h>
  2 e1dddc05 2004-06-17 devnull #include <libc.h>
  3 e1dddc05 2004-06-17 devnull #include <bio.h>
  4 e1dddc05 2004-06-17 devnull #include <ctype.h>
  5 e1dddc05 2004-06-17 devnull #include <disk.h>
  6 e1dddc05 2004-06-17 devnull 
  7 e1dddc05 2004-06-17 devnull static Disk*
  8 e1dddc05 2004-06-17 devnull mkwidth(Disk *disk)
  9 e1dddc05 2004-06-17 devnull {
 10 e1dddc05 2004-06-17 devnull 	char buf[40];
 11 e1dddc05 2004-06-17 devnull 
 12 e1dddc05 2004-06-17 devnull 	sprint(buf, "%lld", disk->size);
 13 e1dddc05 2004-06-17 devnull 	disk->width = strlen(buf);
 14 e1dddc05 2004-06-17 devnull 	return disk;
 15 e1dddc05 2004-06-17 devnull }
 16 e1dddc05 2004-06-17 devnull 
 17 e1dddc05 2004-06-17 devnull /*
 18 e1dddc05 2004-06-17 devnull  * Discover the disk geometry by various sleazeful means.
 19 fa325e9b 2020-01-10 cross  *
 20 e1dddc05 2004-06-17 devnull  * First, if there is a partition table in sector 0,
 21 e1dddc05 2004-06-17 devnull  * see if all the partitions have the same end head
 22 fa325e9b 2020-01-10 cross  * and sector; if so, we'll assume that that's the
 23 e1dddc05 2004-06-17 devnull  * right count.
 24 fa325e9b 2020-01-10 cross  *
 25 e1dddc05 2004-06-17 devnull  * If that fails, we'll try looking at the geometry that the ATA
 26 e1dddc05 2004-06-17 devnull  * driver supplied, if any, and translate that as a
 27 fa325e9b 2020-01-10 cross  * BIOS might.
 28 fa325e9b 2020-01-10 cross  *
 29 e1dddc05 2004-06-17 devnull  * If that too fails, which should only happen on a SCSI
 30 e1dddc05 2004-06-17 devnull  * disk with no currently defined partitions, we'll try
 31 e1dddc05 2004-06-17 devnull  * various common (h, s) pairs used by BIOSes when faking
 32 e1dddc05 2004-06-17 devnull  * the geometries.
 33 e1dddc05 2004-06-17 devnull  */
 34 e1dddc05 2004-06-17 devnull typedef struct Table  Table;
 35 e1dddc05 2004-06-17 devnull typedef struct Tentry Tentry;
 36 e1dddc05 2004-06-17 devnull struct Tentry {
 37 e1dddc05 2004-06-17 devnull 	uchar	active;			/* active flag */
 38 e1dddc05 2004-06-17 devnull 	uchar	starth;			/* starting head */
 39 e1dddc05 2004-06-17 devnull 	uchar	starts;			/* starting sector */
 40 e1dddc05 2004-06-17 devnull 	uchar	startc;			/* starting cylinder */
 41 e1dddc05 2004-06-17 devnull 	uchar	type;			/* partition type */
 42 e1dddc05 2004-06-17 devnull 	uchar	endh;			/* ending head */
 43 e1dddc05 2004-06-17 devnull 	uchar	ends;			/* ending sector */
 44 e1dddc05 2004-06-17 devnull 	uchar	endc;			/* ending cylinder */
 45 e1dddc05 2004-06-17 devnull 	uchar	xlba[4];			/* starting LBA from beginning of disc */
 46 e1dddc05 2004-06-17 devnull 	uchar	xsize[4];		/* size in sectors */
 47 e1dddc05 2004-06-17 devnull };
 48 e1dddc05 2004-06-17 devnull enum {
 49 e1dddc05 2004-06-17 devnull 	Toffset		= 446,		/* offset of partition table in sector */
 50 e1dddc05 2004-06-17 devnull 	Magic0		= 0x55,
 51 e1dddc05 2004-06-17 devnull 	Magic1		= 0xAA,
 52 cbeb0b26 2006-04-01 devnull 	NTentry		= 4
 53 e1dddc05 2004-06-17 devnull };
 54 e1dddc05 2004-06-17 devnull struct Table {
 55 e1dddc05 2004-06-17 devnull 	Tentry	entry[NTentry];
 56 e1dddc05 2004-06-17 devnull 	uchar	magic[2];
 57 e1dddc05 2004-06-17 devnull };
 58 e1dddc05 2004-06-17 devnull static int
 59 e1dddc05 2004-06-17 devnull partitiongeometry(Disk *disk)
 60 e1dddc05 2004-06-17 devnull {
 61 e1dddc05 2004-06-17 devnull 	char *rawname;
 62 e1dddc05 2004-06-17 devnull 	int i, h, rawfd, s;
 63 e1dddc05 2004-06-17 devnull 	uchar buf[512];
 64 e1dddc05 2004-06-17 devnull 	Table *t;
 65 e1dddc05 2004-06-17 devnull 
 66 e1dddc05 2004-06-17 devnull 	t = (Table*)(buf + Toffset);
 67 e1dddc05 2004-06-17 devnull 
 68 e1dddc05 2004-06-17 devnull 	/*
 69 e1dddc05 2004-06-17 devnull 	 * look for an MBR first in the /dev/sdXX/data partition, otherwise
 70 e1dddc05 2004-06-17 devnull 	 * attempt to fall back on the current partition.
 71 e1dddc05 2004-06-17 devnull 	 */
 72 e1dddc05 2004-06-17 devnull 	rawname = malloc(strlen(disk->prefix) + 5);	/* prefix + "data" + nul */
 73 e1dddc05 2004-06-17 devnull 	if(rawname == nil)
 74 e1dddc05 2004-06-17 devnull 		return -1;
 75 e1dddc05 2004-06-17 devnull 
 76 e1dddc05 2004-06-17 devnull 	strcpy(rawname, disk->prefix);
 77 e1dddc05 2004-06-17 devnull 	strcat(rawname, "data");
 78 e1dddc05 2004-06-17 devnull 	rawfd = open(rawname, OREAD);
 79 e1dddc05 2004-06-17 devnull 	free(rawname);
 80 e1dddc05 2004-06-17 devnull 	if(rawfd >= 0
 81 e1dddc05 2004-06-17 devnull 	&& seek(rawfd, 0, 0) >= 0
 82 e1dddc05 2004-06-17 devnull 	&& readn(rawfd, buf, 512) == 512
 83 e1dddc05 2004-06-17 devnull 	&& t->magic[0] == Magic0
 84 e1dddc05 2004-06-17 devnull 	&& t->magic[1] == Magic1) {
 85 e1dddc05 2004-06-17 devnull 		close(rawfd);
 86 e1dddc05 2004-06-17 devnull 	} else {
 87 e1dddc05 2004-06-17 devnull 		if(rawfd >= 0)
 88 e1dddc05 2004-06-17 devnull 			close(rawfd);
 89 e1dddc05 2004-06-17 devnull 		if(seek(disk->fd, 0, 0) < 0
 90 e1dddc05 2004-06-17 devnull 		|| readn(disk->fd, buf, 512) != 512
 91 e1dddc05 2004-06-17 devnull 		|| t->magic[0] != Magic0
 92 e1dddc05 2004-06-17 devnull 		|| t->magic[1] != Magic1) {
 93 e1dddc05 2004-06-17 devnull 			return -1;
 94 e1dddc05 2004-06-17 devnull 		}
 95 e1dddc05 2004-06-17 devnull 	}
 96 e1dddc05 2004-06-17 devnull 
 97 e1dddc05 2004-06-17 devnull 	h = s = -1;
 98 e1dddc05 2004-06-17 devnull 	for(i=0; i<NTentry; i++) {
 99 e1dddc05 2004-06-17 devnull 		if(t->entry[i].type == 0)
100 e1dddc05 2004-06-17 devnull 			continue;
101 e1dddc05 2004-06-17 devnull 
102 e1dddc05 2004-06-17 devnull 		t->entry[i].ends &= 63;
103 e1dddc05 2004-06-17 devnull 		if(h == -1) {
104 e1dddc05 2004-06-17 devnull 			h = t->entry[i].endh;
105 e1dddc05 2004-06-17 devnull 			s = t->entry[i].ends;
106 e1dddc05 2004-06-17 devnull 		} else {
107 e1dddc05 2004-06-17 devnull 			/*
108 e1dddc05 2004-06-17 devnull 			 * Only accept the partition info if every
109 e1dddc05 2004-06-17 devnull 			 * partition is consistent.
110 e1dddc05 2004-06-17 devnull 			 */
111 e1dddc05 2004-06-17 devnull 			if(h != t->entry[i].endh || s != t->entry[i].ends)
112 e1dddc05 2004-06-17 devnull 				return -1;
113 e1dddc05 2004-06-17 devnull 		}
114 e1dddc05 2004-06-17 devnull 	}
115 e1dddc05 2004-06-17 devnull 
116 e1dddc05 2004-06-17 devnull 	if(h == -1)
117 e1dddc05 2004-06-17 devnull 		return -1;
118 e1dddc05 2004-06-17 devnull 
119 e1dddc05 2004-06-17 devnull 	disk->h = h+1;	/* heads count from 0 */
120 e1dddc05 2004-06-17 devnull 	disk->s = s;	/* sectors count from 1 */
121 e1dddc05 2004-06-17 devnull 	disk->c = disk->secs / (disk->h*disk->s);
122 e1dddc05 2004-06-17 devnull 	disk->chssrc = Gpart;
123 e1dddc05 2004-06-17 devnull 	return 0;
124 e1dddc05 2004-06-17 devnull }
125 e1dddc05 2004-06-17 devnull 
126 e1dddc05 2004-06-17 devnull /*
127 e1dddc05 2004-06-17 devnull  * If there is ATA geometry, use it, perhaps massaged.
128 e1dddc05 2004-06-17 devnull  */
129 e1dddc05 2004-06-17 devnull static int
130 e1dddc05 2004-06-17 devnull drivergeometry(Disk *disk)
131 e1dddc05 2004-06-17 devnull {
132 e1dddc05 2004-06-17 devnull 	int m;
133 e1dddc05 2004-06-17 devnull 
134 e1dddc05 2004-06-17 devnull 	if(disk->c == 0 || disk->h == 0 || disk->s == 0)
135 e1dddc05 2004-06-17 devnull 		return -1;
136 e1dddc05 2004-06-17 devnull 
137 e1dddc05 2004-06-17 devnull 	disk->chssrc = Gdisk;
138 e1dddc05 2004-06-17 devnull 	if(disk->c < 1024)
139 e1dddc05 2004-06-17 devnull 		return 0;
140 e1dddc05 2004-06-17 devnull 
141 e1dddc05 2004-06-17 devnull 	switch(disk->h) {
142 e1dddc05 2004-06-17 devnull 	case 15:
143 e1dddc05 2004-06-17 devnull 		disk->h = 255;
144 e1dddc05 2004-06-17 devnull 		disk->c /= 17;
145 e1dddc05 2004-06-17 devnull 		return 0;
146 25745eb3 2008-06-05 rsc 	}
147 e1dddc05 2004-06-17 devnull 
148 25745eb3 2008-06-05 rsc 	for(m = 2; m*disk->h < 256; m *= 2) {
149 25745eb3 2008-06-05 rsc 		if(disk->c/m < 1024) {
150 25745eb3 2008-06-05 rsc 			disk->c /= m;
151 25745eb3 2008-06-05 rsc 			disk->h *= m;
152 25745eb3 2008-06-05 rsc 			return 0;
153 e1dddc05 2004-06-17 devnull 		}
154 e1dddc05 2004-06-17 devnull 	}
155 25745eb3 2008-06-05 rsc 
156 25745eb3 2008-06-05 rsc 	/* set to 255, 63 and be done with it */
157 25745eb3 2008-06-05 rsc 	disk->h = 255;
158 25745eb3 2008-06-05 rsc 	disk->s = 63;
159 25745eb3 2008-06-05 rsc 	disk->c = disk->secs / (disk->h * disk->s);
160 25745eb3 2008-06-05 rsc 	return 0;
161 e1dddc05 2004-06-17 devnull }
162 e1dddc05 2004-06-17 devnull 
163 e1dddc05 2004-06-17 devnull /*
164 e1dddc05 2004-06-17 devnull  * There's no ATA geometry and no partitions.
165 e1dddc05 2004-06-17 devnull  * Our guess is as good as anyone's.
166 e1dddc05 2004-06-17 devnull  */
167 e1dddc05 2004-06-17 devnull static struct {
168 e1dddc05 2004-06-17 devnull 	int h;
169 e1dddc05 2004-06-17 devnull 	int s;
170 e1dddc05 2004-06-17 devnull } guess[] = {
171 e1dddc05 2004-06-17 devnull 	64, 32,
172 e1dddc05 2004-06-17 devnull 	64, 63,
173 e1dddc05 2004-06-17 devnull 	128, 63,
174 e1dddc05 2004-06-17 devnull 	255, 63,
175 e1dddc05 2004-06-17 devnull };
176 e1dddc05 2004-06-17 devnull static int
177 e1dddc05 2004-06-17 devnull guessgeometry(Disk *disk)
178 e1dddc05 2004-06-17 devnull {
179 e1dddc05 2004-06-17 devnull 	int i;
180 e1dddc05 2004-06-17 devnull 	long c;
181 e1dddc05 2004-06-17 devnull 
182 e1dddc05 2004-06-17 devnull 	disk->chssrc = Gguess;
183 e1dddc05 2004-06-17 devnull 	c = 1024;
184 e1dddc05 2004-06-17 devnull 	for(i=0; i<nelem(guess); i++)
185 e1dddc05 2004-06-17 devnull 		if(c*guess[i].h*guess[i].s >= disk->secs) {
186 e1dddc05 2004-06-17 devnull 			disk->h = guess[i].h;
187 e1dddc05 2004-06-17 devnull 			disk->s = guess[i].s;
188 e1dddc05 2004-06-17 devnull 			disk->c = disk->secs / (disk->h * disk->s);
189 e1dddc05 2004-06-17 devnull 			return 0;
190 e1dddc05 2004-06-17 devnull 		}
191 e1dddc05 2004-06-17 devnull 
192 e1dddc05 2004-06-17 devnull 	/* use maximum values */
193 e1dddc05 2004-06-17 devnull 	disk->h = 255;
194 e1dddc05 2004-06-17 devnull 	disk->s = 63;
195 e1dddc05 2004-06-17 devnull 	disk->c = disk->secs / (disk->h * disk->s);
196 e1dddc05 2004-06-17 devnull 	return 0;
197 e1dddc05 2004-06-17 devnull }
198 e1dddc05 2004-06-17 devnull 
199 e1dddc05 2004-06-17 devnull static void
200 e1dddc05 2004-06-17 devnull findgeometry(Disk *disk)
201 e1dddc05 2004-06-17 devnull {
202 e1dddc05 2004-06-17 devnull 	if(partitiongeometry(disk) < 0
203 e1dddc05 2004-06-17 devnull 	&& drivergeometry(disk) < 0
204 e1dddc05 2004-06-17 devnull 	&& guessgeometry(disk) < 0) {	/* can't happen */
205 e1dddc05 2004-06-17 devnull 		print("we're completely confused about your disk; sorry\n");
206 e1dddc05 2004-06-17 devnull 		assert(0);
207 e1dddc05 2004-06-17 devnull 	}
208 e1dddc05 2004-06-17 devnull }
209 e1dddc05 2004-06-17 devnull 
210 e1dddc05 2004-06-17 devnull static Disk*
211 e1dddc05 2004-06-17 devnull openfile(Disk *disk)
212 e1dddc05 2004-06-17 devnull {
213 e1dddc05 2004-06-17 devnull 	Dir *d;
214 e1dddc05 2004-06-17 devnull 
215 e1dddc05 2004-06-17 devnull 	if((d = dirfstat(disk->fd)) == nil){
216 e1dddc05 2004-06-17 devnull 		free(disk);
217 e1dddc05 2004-06-17 devnull 		return nil;
218 e1dddc05 2004-06-17 devnull 	}
219 e1dddc05 2004-06-17 devnull 
220 e1dddc05 2004-06-17 devnull 	disk->secsize = 512;
221 e1dddc05 2004-06-17 devnull 	disk->size = d->length;
222 e1dddc05 2004-06-17 devnull 	disk->secs = disk->size / disk->secsize;
223 e1dddc05 2004-06-17 devnull 	disk->offset = 0;
224 e1dddc05 2004-06-17 devnull 	free(d);
225 e1dddc05 2004-06-17 devnull 
226 e1dddc05 2004-06-17 devnull 	findgeometry(disk);
227 e1dddc05 2004-06-17 devnull 	return mkwidth(disk);
228 e1dddc05 2004-06-17 devnull }
229 e1dddc05 2004-06-17 devnull 
230 e1dddc05 2004-06-17 devnull static Disk*
231 e1dddc05 2004-06-17 devnull opensd(Disk *disk)
232 e1dddc05 2004-06-17 devnull {
233 e1dddc05 2004-06-17 devnull 	Biobuf b;
234 e1dddc05 2004-06-17 devnull 	char *p, *f[10];
235 e1dddc05 2004-06-17 devnull 	int nf;
236 e1dddc05 2004-06-17 devnull 
237 e1dddc05 2004-06-17 devnull 	Binit(&b, disk->ctlfd, OREAD);
238 e1dddc05 2004-06-17 devnull 	while(p = Brdline(&b, '\n')) {
239 e1dddc05 2004-06-17 devnull 		p[Blinelen(&b)-1] = '\0';
240 e1dddc05 2004-06-17 devnull 		nf = tokenize(p, f, nelem(f));
241 e1dddc05 2004-06-17 devnull 		if(nf >= 3 && strcmp(f[0], "geometry") == 0) {
242 e1dddc05 2004-06-17 devnull 			disk->secsize = strtoll(f[2], 0, 0);
243 e1dddc05 2004-06-17 devnull 			if(nf >= 6) {
244 e1dddc05 2004-06-17 devnull 				disk->c = strtol(f[3], 0, 0);
245 e1dddc05 2004-06-17 devnull 				disk->h = strtol(f[4], 0, 0);
246 e1dddc05 2004-06-17 devnull 				disk->s = strtol(f[5], 0, 0);
247 e1dddc05 2004-06-17 devnull 			}
248 e1dddc05 2004-06-17 devnull 		}
249 e1dddc05 2004-06-17 devnull 		if(nf >= 4 && strcmp(f[0], "part") == 0 && strcmp(f[1], disk->part) == 0) {
250 e1dddc05 2004-06-17 devnull 			disk->offset = strtoll(f[2], 0, 0);
251 e1dddc05 2004-06-17 devnull 			disk->secs = strtoll(f[3], 0, 0) - disk->offset;
252 e1dddc05 2004-06-17 devnull 		}
253 e1dddc05 2004-06-17 devnull 	}
254 e1dddc05 2004-06-17 devnull 
255 fa325e9b 2020-01-10 cross 
256 e1dddc05 2004-06-17 devnull 	disk->size = disk->secs * disk->secsize;
257 e1dddc05 2004-06-17 devnull 	if(disk->size <= 0) {
258 e1dddc05 2004-06-17 devnull 		strcpy(disk->part, "");
259 e1dddc05 2004-06-17 devnull 		disk->type = Tfile;
260 e1dddc05 2004-06-17 devnull 		return openfile(disk);
261 e1dddc05 2004-06-17 devnull 	}
262 e1dddc05 2004-06-17 devnull 
263 e1dddc05 2004-06-17 devnull 	findgeometry(disk);
264 e1dddc05 2004-06-17 devnull 	return mkwidth(disk);
265 e1dddc05 2004-06-17 devnull }
266 e1dddc05 2004-06-17 devnull 
267 e1dddc05 2004-06-17 devnull Disk*
268 e1dddc05 2004-06-17 devnull opendisk(char *disk, int rdonly, int noctl)
269 e1dddc05 2004-06-17 devnull {
270 e1dddc05 2004-06-17 devnull 	char *p, *q;
271 e1dddc05 2004-06-17 devnull 	Disk *d;
272 e1dddc05 2004-06-17 devnull 
273 e1dddc05 2004-06-17 devnull 	d = malloc(sizeof(*d));
274 e1dddc05 2004-06-17 devnull 	if(d == nil)
275 e1dddc05 2004-06-17 devnull 		return nil;
276 e1dddc05 2004-06-17 devnull 
277 e1dddc05 2004-06-17 devnull 	d->fd = d->wfd = d->ctlfd = -1;
278 e1dddc05 2004-06-17 devnull 	d->rdonly = rdonly;
279 e1dddc05 2004-06-17 devnull 
280 e1dddc05 2004-06-17 devnull 	d->fd = open(disk, OREAD);
281 e1dddc05 2004-06-17 devnull 	if(d->fd < 0) {
282 e1dddc05 2004-06-17 devnull 		werrstr("cannot open disk file");
283 e1dddc05 2004-06-17 devnull 		free(d);
284 e1dddc05 2004-06-17 devnull 		return nil;
285 e1dddc05 2004-06-17 devnull 	}
286 e1dddc05 2004-06-17 devnull 
287 e1dddc05 2004-06-17 devnull 	if(rdonly == 0) {
288 e1dddc05 2004-06-17 devnull 		d->wfd = open(disk, OWRITE);
289 e1dddc05 2004-06-17 devnull 		if(d->wfd < 0)
290 e1dddc05 2004-06-17 devnull 			d->rdonly = 1;
291 e1dddc05 2004-06-17 devnull 	}
292 e1dddc05 2004-06-17 devnull 
293 e1dddc05 2004-06-17 devnull 	if(noctl)
294 e1dddc05 2004-06-17 devnull 		return openfile(d);
295 e1dddc05 2004-06-17 devnull 
296 e1dddc05 2004-06-17 devnull 	p = malloc(strlen(disk) + 4);	/* 4: slop for "ctl\0" */
297 e1dddc05 2004-06-17 devnull 	if(p == nil) {
298 e1dddc05 2004-06-17 devnull 		close(d->wfd);
299 e1dddc05 2004-06-17 devnull 		close(d->fd);
300 e1dddc05 2004-06-17 devnull 		free(d);
301 e1dddc05 2004-06-17 devnull 		return nil;
302 e1dddc05 2004-06-17 devnull 	}
303 e1dddc05 2004-06-17 devnull 	strcpy(p, disk);
304 e1dddc05 2004-06-17 devnull 
305 e1dddc05 2004-06-17 devnull 	/* check for floppy(3) disk */
306 e1dddc05 2004-06-17 devnull 	if(strlen(p) >= 7) {
307 e1dddc05 2004-06-17 devnull 		q = p+strlen(p)-7;
308 604ad4d8 2005-11-01 devnull 		if(q[0] == 'f' && q[1] == 'd' && isdigit((uchar)q[2]) && strcmp(q+3, "disk") == 0) {
309 e1dddc05 2004-06-17 devnull 			strcpy(q+3, "ctl");
310 e1dddc05 2004-06-17 devnull 			if((d->ctlfd = open(p, ORDWR)) >= 0) {
311 e1dddc05 2004-06-17 devnull 				*q = '\0';
312 e1dddc05 2004-06-17 devnull 				d->prefix = p;
313 e1dddc05 2004-06-17 devnull 				d->type = Tfloppy;
314 e1dddc05 2004-06-17 devnull 				return openfile(d);
315 e1dddc05 2004-06-17 devnull 			}
316 e1dddc05 2004-06-17 devnull 		}
317 e1dddc05 2004-06-17 devnull 	}
318 e1dddc05 2004-06-17 devnull 
319 e1dddc05 2004-06-17 devnull 	/* attempt to find sd(3) disk or partition */
320 e1dddc05 2004-06-17 devnull 	if(q = strrchr(p, '/'))
321 e1dddc05 2004-06-17 devnull 		q++;
322 e1dddc05 2004-06-17 devnull 	else
323 e1dddc05 2004-06-17 devnull 		q = p;
324 e1dddc05 2004-06-17 devnull 
325 e1dddc05 2004-06-17 devnull 	strcpy(q, "ctl");
326 e1dddc05 2004-06-17 devnull 	if((d->ctlfd = open(p, ORDWR)) >= 0) {
327 e1dddc05 2004-06-17 devnull 		*q = '\0';
328 e1dddc05 2004-06-17 devnull 		d->prefix = p;
329 e1dddc05 2004-06-17 devnull 		d->type = Tsd;
330 e1dddc05 2004-06-17 devnull 		d->part = strdup(disk+(q-p));
331 e1dddc05 2004-06-17 devnull 		if(d->part == nil){
332 e1dddc05 2004-06-17 devnull 			close(d->ctlfd);
333 e1dddc05 2004-06-17 devnull 			close(d->wfd);
334 e1dddc05 2004-06-17 devnull 			close(d->fd);
335 e1dddc05 2004-06-17 devnull 			free(p);
336 e1dddc05 2004-06-17 devnull 			free(d);
337 e1dddc05 2004-06-17 devnull 			return nil;
338 e1dddc05 2004-06-17 devnull 		}
339 e1dddc05 2004-06-17 devnull 		return opensd(d);
340 e1dddc05 2004-06-17 devnull 	}
341 e1dddc05 2004-06-17 devnull 
342 e1dddc05 2004-06-17 devnull 	*q = '\0';
343 e1dddc05 2004-06-17 devnull 	d->prefix = p;
344 e1dddc05 2004-06-17 devnull 	/* assume we just have a normal file */
345 e1dddc05 2004-06-17 devnull 	d->type = Tfile;
346 e1dddc05 2004-06-17 devnull 	return openfile(d);
347 e1dddc05 2004-06-17 devnull }