disk.c revision 8241 
1/*
2 * ----------------------------------------------------------------------------
3 * "THE BEER-WARE LICENSE" (Revision 42):
4 * <phk@login.dknet.dk> wrote this file.  As long as you retain this notice you
5 * can do whatever you want with this stuff. If we meet some day, and you think
6 * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
7 * ----------------------------------------------------------------------------
8 *
9 * $Id: disk.c,v 1.13 1995/05/03 06:30:55 phk Exp $
10 *
11 */
12
13#include <stdio.h>
14#include <stdlib.h>
15#include <unistd.h>
16#include <fcntl.h>
17#include <string.h>
18#include <err.h>
19#include <sys/types.h>
20#include <sys/stat.h>
21#include <sys/ioctl.h>
22#include <sys/disklabel.h>
23#include <sys/diskslice.h>
24#include "libdisk.h"
25
26#define DOSPTYP_EXTENDED        5
27#define DOSPTYP_ONTRACK         84
28
29char *chunk_n[] = {
30	"whole",
31	"unknown",
32	"fat",
33	"freebsd",
34	"extended",
35	"part",
36	"unused",
37	"reserved",
38	NULL
39};
40
41struct disk *
42Open_Disk(char *name)
43{
44	return Int_Open_Disk(name,0);
45}
46
47struct disk *
48Int_Open_Disk(char *name, u_long size)
49{
50	int i,fd;
51	struct diskslices ds;
52	struct disklabel dl;
53	char device[64];
54	struct disk *d;
55	struct dos_partition *dp;
56	void *p;
57
58	strcpy(device,"/dev/r");
59	strcat(device,name);
60
61	d = (struct disk *)malloc(sizeof *d);
62	if(!d) err(1,"malloc failed");
63	memset(d,0,sizeof *d);
64
65	fd = open(device,O_RDONLY);
66	if (fd < 0) {
67		warn("open(%s) failed",device);
68		return 0;
69	}
70
71	memset(&dl,0,sizeof dl);
72	ioctl(fd,DIOCGDINFO,&dl);
73	i = ioctl(fd,DIOCGSLICEINFO,&ds);
74	if (i < 0) {
75		warn("DIOCGSLICEINFO(%s) failed",device);
76		close(fd);
77		return 0;
78	}
79
80#ifdef DEBUG
81	for(i=0;i<ds.dss_nslices;i++)
82		if(ds.dss_slices[i].ds_openmask)
83			printf("  open(%d)=0x%2x",
84				i,ds.dss_slices[i].ds_openmask);
85	printf("\n");
86#endif
87
88	if (!size)
89		size = ds.dss_slices[WHOLE_DISK_SLICE].ds_size;
90
91	p = read_block(fd,0);
92	dp = (struct dos_partition*)(p+DOSPARTOFF);
93	for(i=0;i<NDOSPART;i++) {
94		if (dp->dp_start >= size) continue;
95		if (dp->dp_start+dp->dp_size >= size) continue;
96		if (!dp->dp_size) continue;
97
98		if (dp->dp_typ == DOSPTYP_ONTRACK)
99			d->flags |= DISK_ON_TRACK;
100
101	}
102	free(p);
103
104	d->bios_sect = dl.d_nsectors;
105	d->bios_hd = dl.d_ntracks;
106
107	d->name = strdup(name);
108
109
110	if (dl.d_ntracks && dl.d_nsectors)
111		d->bios_cyl = size/(dl.d_ntracks*dl.d_nsectors);
112
113	if (Add_Chunk(d, 0, size, name,whole,0,0))
114		warn("Failed to add 'whole' chunk");
115
116	for(i=BASE_SLICE;i<ds.dss_nslices;i++) {
117		char sname[20];
118		chunk_e ce;
119		u_long flags=0;
120		int subtype=0;
121		if (! ds.dss_slices[i].ds_size)
122			continue;
123		sprintf(sname,"%ss%d",name,i-1);
124		subtype = ds.dss_slices[i].ds_type;
125		switch (ds.dss_slices[i].ds_type) {
126			case 0xa5:
127				ce = freebsd;
128				break;
129			case 0x1:
130			case 0x4:
131				ce = fat;
132				break;
133			case DOSPTYP_EXTENDED:
134				ce = extended;
135				break;
136			default:
137				ce = unknown;
138				break;
139		}
140		flags |= CHUNK_ALIGN;
141		if (Add_Chunk(d,ds.dss_slices[i].ds_offset,
142			ds.dss_slices[i].ds_size, sname,ce,subtype,flags))
143			warn("failed to add chunk for slice %d",i - 1);
144
145		if (ds.dss_slices[i].ds_type != 0xa5)
146			continue;
147		{
148		struct disklabel dl;
149		char pname[20];
150		int j,k;
151
152		strcpy(pname,"/dev/r");
153		strcat(pname,sname);
154		j = open(pname,O_RDONLY);
155		if (j < 0) {
156			warn("open(%s)",pname);
157			continue;
158		}
159		k = ioctl(j,DIOCGDINFO,&dl);
160		if (k < 0) {
161			warn("ioctl(%s,DIOCGDINFO)",pname);
162			close(j);
163			continue;
164		}
165		close(j);
166
167		for(j=0; j <= dl.d_npartitions; j++) {
168			if (j == RAW_PART)
169				continue;
170			if (j == 3)
171				continue;
172			if (j == dl.d_npartitions) {
173				j = 3;
174				dl.d_npartitions=0;
175			}
176			if (!dl.d_partitions[j].p_size)
177				continue;
178			if (dl.d_partitions[j].p_size +
179			    dl.d_partitions[j].p_offset >
180			    ds.dss_slices[i].ds_size)
181				continue;
182			sprintf(pname,"%s%c",sname,j+'a');
183			if (Add_Chunk(d,
184				dl.d_partitions[j].p_offset +
185				ds.dss_slices[i].ds_offset,
186				dl.d_partitions[j].p_size,
187				pname,part,
188				dl.d_partitions[j].p_fstype,
189				j == 0 ? CHUNK_IS_ROOT : 0) && j != 3)
190				warn(
191			"Failed to add chunk for partition %c [%lu,%lu]",
192			j + 'a',dl.d_partitions[j].p_offset,
193			dl.d_partitions[j].p_size);
194		}
195		}
196	}
197	close(fd);
198	Fixup_Names(d);
199	return d;
200}
201
202void
203Debug_Disk(struct disk *d)
204{
205	printf("Debug_Disk(%s)",d->name);
206	printf("  flags=%lx",d->flags);
207	printf("  real_geom=%lu/%lu/%lu",d->real_cyl,d->real_hd,d->real_sect);
208	printf("  bios_geom=%lu/%lu/%lu\n",d->bios_cyl,d->bios_hd,d->bios_sect);
209	printf("  boot1=%p, boot2=%p, bootmgr=%p\n",
210		d->boot1,d->boot2,d->bootmgr);
211	Debug_Chunk(d->chunks);
212}
213
214void
215Free_Disk(struct disk *d)
216{
217	if(d->chunks) Free_Chunk(d->chunks);
218	if(d->name) free(d->name);
219	if(d->bootmgr) free(d->bootmgr);
220	if(d->boot1) free(d->boot1);
221	if(d->boot2) free(d->boot2);
222	free(d);
223}
224
225struct disk *
226Clone_Disk(struct disk *d)
227{
228	struct disk *d2;
229
230	d2 = (struct disk*) malloc(sizeof *d2);
231	if(!d2) err(1,"malloc failed");
232	*d2 = *d;
233	d2->name = strdup(d2->name);
234	d2->chunks = Clone_Chunk(d2->chunks);
235	if(d2->bootmgr) {
236		d2->bootmgr = malloc(DOSPARTOFF);
237		memcpy(d2->bootmgr,d->bootmgr,DOSPARTOFF);
238	}
239	if(d2->boot1) {
240		d2->boot1 = malloc(512);
241		memcpy(d2->boot1,d->boot1,512);
242	}
243	if(d2->boot2) {
244		d2->boot2 = malloc(512*15);
245		memcpy(d2->boot2,d->boot2,512*15);
246	}
247	return d2;
248}
249
250void
251Collapse_Disk(struct disk *d)
252{
253
254	while(Collapse_Chunk(d,d->chunks))
255		;
256}
257
258static char * device_list[] = {"wd","sd",0};
259
260char **
261Disk_Names()
262{
263    int i,j,k;
264    char disk[25];
265    char diskname[25];
266    struct stat st;
267    struct diskslices ds;
268    int fd;
269    static char **disks;
270
271    disks = malloc(sizeof *disks * (1 + MAX_NO_DISKS));
272    memset(disks,0,sizeof *disks * (1 + MAX_NO_DISKS));
273    k = 0;
274	for (j = 0; device_list[j]; j++) {
275		for (i = 0; i < 10; i++) {
276			sprintf(diskname, "%s%d", device_list[j], i);
277			sprintf(disk, "/dev/r%s", diskname);
278			if (stat(disk, &st) || !(st.st_mode & S_IFCHR))
279				continue;
280			if ((fd = open(disk, O_RDWR)) == -1)
281				continue;
282			if (ioctl(fd, DIOCGSLICEINFO, &ds) == -1) {
283				close(fd);
284				continue;
285			}
286			disks[k++] = strdup(diskname);
287			if(k == MAX_NO_DISKS)
288				return disks;
289		}
290	}
291	return disks;
292}
293
294void
295Set_Boot_Mgr(struct disk *d, u_char *b)
296{
297	if (d->bootmgr)
298		free(d->bootmgr);
299	if (!b) {
300		d->bootmgr = 0;
301	} else {
302		d->bootmgr = malloc(DOSPARTOFF);
303		if(!d->bootmgr) err(1,"malloc failed");
304		memcpy(d->bootmgr,b,DOSPARTOFF);
305	}
306}
307
308void
309Set_Boot_Blocks(struct disk *d, u_char *b1, u_char *b2)
310{
311	if (d->boot1) free(d->boot1);
312	d->boot1 = malloc(512);
313	if(!d->boot1) err(1,"malloc failed");
314	memcpy(d->boot1,b1,512);
315	if (d->boot2) free(d->boot2);
316	d->boot2 = malloc(15*512);
317	if(!d->boot2) err(1,"malloc failed");
318	memcpy(d->boot2,b2,15*512);
319}
320