1 a0d146ed 2005-07-12 devnull #ifdef PLAN9PORT	/* SORRY! */
  2 769eb198 2005-07-20 devnull #	include <u.h>
  3 769eb198 2005-07-20 devnull #	include <sys/types.h>
  4 769eb198 2005-07-20 devnull #	ifdef __linux__	/* REALLY SORRY! */
  5 769eb198 2005-07-20 devnull #		define CANBLOCKSIZE 1
  6 769eb198 2005-07-20 devnull #		include <sys/vfs.h>
  7 769eb198 2005-07-20 devnull #	elif defined(__FreeBSD__)
  8 769eb198 2005-07-20 devnull #		define CANBLOCKSIZE 1
  9 769eb198 2005-07-20 devnull #		include <sys/param.h>
 10 ba3c918e 2005-08-11 devnull #		include <sys/stat.h>
 11 769eb198 2005-07-20 devnull #		include <sys/mount.h>
 12 769eb198 2005-07-20 devnull #	endif
 13 a0d146ed 2005-07-12 devnull #endif
 14 a0d146ed 2005-07-12 devnull #include "stdinc.h"
 15 a0d146ed 2005-07-12 devnull #include <ctype.h>
 16 a0d146ed 2005-07-12 devnull #include "dat.h"
 17 a0d146ed 2005-07-12 devnull #include "fns.h"
 18 a0d146ed 2005-07-12 devnull 
 19 a0d146ed 2005-07-12 devnull u32int	maxblocksize;
 20 a0d146ed 2005-07-12 devnull int	readonly;
 21 a0d146ed 2005-07-12 devnull 
 22 a0d146ed 2005-07-12 devnull static int
 23 a0d146ed 2005-07-12 devnull strtoullsuf(char *p, char **pp, int rad, u64int *u)
 24 a0d146ed 2005-07-12 devnull {
 25 a0d146ed 2005-07-12 devnull 	u64int v;
 26 a0d146ed 2005-07-12 devnull 
 27 3bd56b04 2005-09-09 devnull 	if(!isdigit((uchar)*p))
 28 a0d146ed 2005-07-12 devnull 		return -1;
 29 a0d146ed 2005-07-12 devnull 	v = strtoull(p, &p, rad);
 30 a0d146ed 2005-07-12 devnull 	switch(*p){
 31 a0d146ed 2005-07-12 devnull 	case 'k':
 32 a0d146ed 2005-07-12 devnull 	case 'K':
 33 a0d146ed 2005-07-12 devnull 		v *= 1024;
 34 a0d146ed 2005-07-12 devnull 		p++;
 35 a0d146ed 2005-07-12 devnull 		break;
 36 a0d146ed 2005-07-12 devnull 	case 'm':
 37 a0d146ed 2005-07-12 devnull 	case 'M':
 38 a0d146ed 2005-07-12 devnull 		v *= 1024*1024;
 39 a0d146ed 2005-07-12 devnull 		p++;
 40 a0d146ed 2005-07-12 devnull 		break;
 41 a0d146ed 2005-07-12 devnull 	case 'g':
 42 a0d146ed 2005-07-12 devnull 	case 'G':
 43 a0d146ed 2005-07-12 devnull 		v *= 1024*1024*1024;
 44 a0d146ed 2005-07-12 devnull 		p++;
 45 a0d146ed 2005-07-12 devnull 		break;
 46 a0d146ed 2005-07-12 devnull 	case 't':
 47 a0d146ed 2005-07-12 devnull 	case 'T':
 48 a0d146ed 2005-07-12 devnull 		v *= 1024*1024;
 49 a0d146ed 2005-07-12 devnull 		v *= 1024*1024;
 50 a0d146ed 2005-07-12 devnull 		p++;
 51 a0d146ed 2005-07-12 devnull 		break;
 52 a0d146ed 2005-07-12 devnull 	}
 53 a0d146ed 2005-07-12 devnull 	*pp = p;
 54 a0d146ed 2005-07-12 devnull 	*u = v;
 55 a0d146ed 2005-07-12 devnull 	return 0;
 56 a0d146ed 2005-07-12 devnull }
 57 a0d146ed 2005-07-12 devnull 	
 58 a0d146ed 2005-07-12 devnull static int
 59 a0d146ed 2005-07-12 devnull parsepart(char *name, char **file, u64int *lo, u64int *hi)
 60 a0d146ed 2005-07-12 devnull {
 61 a0d146ed 2005-07-12 devnull 	char *p;
 62 a0d146ed 2005-07-12 devnull 
 63 a0d146ed 2005-07-12 devnull 	*file = estrdup(name);
 64 a0d146ed 2005-07-12 devnull 	if((p = strrchr(*file, ':')) == nil){
 65 a0d146ed 2005-07-12 devnull 		*lo = 0;
 66 a0d146ed 2005-07-12 devnull 		*hi = 0;
 67 a0d146ed 2005-07-12 devnull 		return 0;
 68 a0d146ed 2005-07-12 devnull 	}
 69 a0d146ed 2005-07-12 devnull 	*p++ = 0;
 70 a0d146ed 2005-07-12 devnull 	if(*p == '-')
 71 a0d146ed 2005-07-12 devnull 		*lo = 0;
 72 a0d146ed 2005-07-12 devnull 	else{
 73 a0d146ed 2005-07-12 devnull 		if(strtoullsuf(p, &p, 0, lo) < 0){
 74 a0d146ed 2005-07-12 devnull 			free(*file);
 75 a0d146ed 2005-07-12 devnull 			return -1;
 76 a0d146ed 2005-07-12 devnull 		}
 77 a0d146ed 2005-07-12 devnull 	}
 78 a0d146ed 2005-07-12 devnull 	if(*p == '-')
 79 a0d146ed 2005-07-12 devnull 		p++;
 80 a0d146ed 2005-07-12 devnull 	if(*p == 0){
 81 a0d146ed 2005-07-12 devnull 		*hi = 0;
 82 a0d146ed 2005-07-12 devnull 		return 0;
 83 a0d146ed 2005-07-12 devnull 	}
 84 a0d146ed 2005-07-12 devnull 	if(strtoullsuf(p, &p, 0, hi) < 0 || *p != 0){
 85 a0d146ed 2005-07-12 devnull 		free(*file);
 86 a0d146ed 2005-07-12 devnull 		return -1;
 87 a0d146ed 2005-07-12 devnull 	}
 88 a0d146ed 2005-07-12 devnull 	return 0;
 89 a0d146ed 2005-07-12 devnull }
 90 a0d146ed 2005-07-12 devnull 
 91 a0d146ed 2005-07-12 devnull Part*
 92 a0d146ed 2005-07-12 devnull initpart(char *name, int mode)
 93 a0d146ed 2005-07-12 devnull {
 94 a0d146ed 2005-07-12 devnull 	Part *part;
 95 a0d146ed 2005-07-12 devnull 	Dir *dir;
 96 a0d146ed 2005-07-12 devnull 	char *file;
 97 a0d146ed 2005-07-12 devnull 	u64int lo, hi;
 98 a0d146ed 2005-07-12 devnull 
 99 a0d146ed 2005-07-12 devnull 	if(parsepart(name, &file, &lo, &hi) < 0)
100 a0d146ed 2005-07-12 devnull 		return nil;
101 a0d146ed 2005-07-12 devnull 	trace(TraceDisk, "initpart %s file %s lo 0x%llx hi 0x%llx", name, file, lo, hi);
102 a0d146ed 2005-07-12 devnull 	part = MKZ(Part);
103 a0d146ed 2005-07-12 devnull 	part->name = estrdup(name);
104 a0d146ed 2005-07-12 devnull 	part->filename = estrdup(file);
105 a0d146ed 2005-07-12 devnull 	if(readonly){
106 a0d146ed 2005-07-12 devnull 		mode &= (OREAD|OWRITE|ORDWR);
107 a0d146ed 2005-07-12 devnull 		mode |= OREAD;
108 a0d146ed 2005-07-12 devnull 	}
109 a0d146ed 2005-07-12 devnull 	part->fd = open(file, mode);
110 a0d146ed 2005-07-12 devnull 	if(part->fd < 0){
111 a0d146ed 2005-07-12 devnull 		if((mode&(OREAD|OWRITE|ORDWR)) == ORDWR)
112 a0d146ed 2005-07-12 devnull 			part->fd = open(file, (mode&~ORDWR)|OREAD);
113 a0d146ed 2005-07-12 devnull 		if(part->fd < 0){
114 a0d146ed 2005-07-12 devnull 			freepart(part);
115 a0d146ed 2005-07-12 devnull 			fprint(2, "can't open partition='%s': %r\n", file);
116 a0d146ed 2005-07-12 devnull 			seterr(EOk, "can't open partition='%s': %r", file);
117 a0d146ed 2005-07-12 devnull 			fprint(2, "%r\n");
118 a0d146ed 2005-07-12 devnull 			free(file);
119 a0d146ed 2005-07-12 devnull 			return nil;
120 a0d146ed 2005-07-12 devnull 		}
121 a0d146ed 2005-07-12 devnull 		fprint(2, "warning: %s opened for reading only\n", name);
122 a0d146ed 2005-07-12 devnull 	}
123 a0d146ed 2005-07-12 devnull 	part->offset = lo;
124 a0d146ed 2005-07-12 devnull 	dir = dirfstat(part->fd);
125 a0d146ed 2005-07-12 devnull 	if(dir == nil){
126 a0d146ed 2005-07-12 devnull 		freepart(part);
127 a0d146ed 2005-07-12 devnull 		seterr(EOk, "can't stat partition='%s': %r", file);
128 a0d146ed 2005-07-12 devnull 		free(file);
129 a0d146ed 2005-07-12 devnull 		return nil;
130 a0d146ed 2005-07-12 devnull 	}
131 a0d146ed 2005-07-12 devnull 	if(dir->length == 0){
132 a0d146ed 2005-07-12 devnull 		free(dir);
133 a0d146ed 2005-07-12 devnull 		freepart(part);
134 a0d146ed 2005-07-12 devnull 		seterr(EOk, "can't determine size of partition %s", file);
135 a0d146ed 2005-07-12 devnull 		free(file);
136 a0d146ed 2005-07-12 devnull 		return nil;
137 a0d146ed 2005-07-12 devnull 	}
138 a0d146ed 2005-07-12 devnull 	if(dir->length < hi || dir->length < lo){
139 a0d146ed 2005-07-12 devnull 		freepart(part);
140 a0d146ed 2005-07-12 devnull 		seterr(EOk, "partition '%s': bounds out of range (max %lld)", name, dir->length);
141 a0d146ed 2005-07-12 devnull 		free(dir);
142 a0d146ed 2005-07-12 devnull 		free(file);
143 a0d146ed 2005-07-12 devnull 		return nil;
144 a0d146ed 2005-07-12 devnull 	}
145 a0d146ed 2005-07-12 devnull 	if(hi == 0)
146 a0d146ed 2005-07-12 devnull 		hi = dir->length;
147 a0d146ed 2005-07-12 devnull 	part->size = hi - part->offset;
148 bdbc55d3 2005-11-28 devnull fprint(2, "part %s: file %s offset %,lld size %,lld\n", 
149 bdbc55d3 2005-11-28 devnull 	name, file, part->offset, part->size);
150 0613fe4b 2005-07-19 devnull #ifdef CANBLOCKSIZE
151 a0d146ed 2005-07-12 devnull 	{
152 a0d146ed 2005-07-12 devnull 		struct statfs sfs;
153 a0d146ed 2005-07-12 devnull 		if(fstatfs(part->fd, &sfs) >= 0)
154 a0d146ed 2005-07-12 devnull 			part->fsblocksize = sfs.f_bsize;
155 a0d146ed 2005-07-12 devnull 	}
156 a0d146ed 2005-07-12 devnull #endif
157 a0d146ed 2005-07-12 devnull 	free(dir);
158 a0d146ed 2005-07-12 devnull 	return part;
159 a0d146ed 2005-07-12 devnull }
160 a0d146ed 2005-07-12 devnull 
161 a0d146ed 2005-07-12 devnull void
162 a0d146ed 2005-07-12 devnull freepart(Part *part)
163 a0d146ed 2005-07-12 devnull {
164 a0d146ed 2005-07-12 devnull 	if(part == nil)
165 a0d146ed 2005-07-12 devnull 		return;
166 a0d146ed 2005-07-12 devnull 	if(part->fd >= 0)
167 a0d146ed 2005-07-12 devnull 		close(part->fd);
168 a0d146ed 2005-07-12 devnull 	free(part->name);
169 a0d146ed 2005-07-12 devnull 	free(part);
170 a0d146ed 2005-07-12 devnull }
171 a0d146ed 2005-07-12 devnull 
172 a0d146ed 2005-07-12 devnull void
173 a0d146ed 2005-07-12 devnull partblocksize(Part *part, u32int blocksize)
174 a0d146ed 2005-07-12 devnull {
175 a0d146ed 2005-07-12 devnull 	if(part->blocksize)
176 a0d146ed 2005-07-12 devnull 		sysfatal("resetting partition=%s's block size", part->name);
177 a0d146ed 2005-07-12 devnull 	part->blocksize = blocksize;
178 a0d146ed 2005-07-12 devnull 	if(blocksize > maxblocksize)
179 a0d146ed 2005-07-12 devnull 		maxblocksize = blocksize;
180 a0d146ed 2005-07-12 devnull }
181 a0d146ed 2005-07-12 devnull 
182 a0d146ed 2005-07-12 devnull /*
183 a0d146ed 2005-07-12 devnull  * Read/write some amount of data between a block device or file and a memory buffer.
184 a0d146ed 2005-07-12 devnull  *
185 a0d146ed 2005-07-12 devnull  * Most Unix systems require that when accessing a block device directly,
186 a0d146ed 2005-07-12 devnull  * the buffer, offset, and count are all multiples of the device block size,
187 a0d146ed 2005-07-12 devnull  * making this a lot more complicated than it otherwise would be.
188 a0d146ed 2005-07-12 devnull  * 
189 a0d146ed 2005-07-12 devnull  * Most of our callers will make things easy on us, but for some callers it's best
190 a0d146ed 2005-07-12 devnull  * if we just do the work here, with only one place to get it right (hopefully).
191 a0d146ed 2005-07-12 devnull  * 
192 a0d146ed 2005-07-12 devnull  * If everything is aligned properly, prwb will try to do big transfers in the main 
193 a0d146ed 2005-07-12 devnull  * body of the loop: up to MaxIo bytes at a time.  If everything isn't aligned properly,
194 a0d146ed 2005-07-12 devnull  * we work one block at a time.
195 a0d146ed 2005-07-12 devnull  */
196 a0d146ed 2005-07-12 devnull #undef min
197 a0d146ed 2005-07-12 devnull #define min(a, b) ((a) < (b) ? (a) : (b))
198 a0d146ed 2005-07-12 devnull int
199 a0d146ed 2005-07-12 devnull prwb(char *name, int fd, int isread, u64int offset, void *vbuf, u32int count, u32int blocksize)
200 a0d146ed 2005-07-12 devnull {
201 a0d146ed 2005-07-12 devnull 	char *op;
202 a0d146ed 2005-07-12 devnull 	u8int *buf, *tmp, *freetmp, *dst;
203 a0d146ed 2005-07-12 devnull 	u32int c, delta, icount, opsize;
204 a0d146ed 2005-07-12 devnull 	int r;
205 a0d146ed 2005-07-12 devnull 
206 a0d146ed 2005-07-12 devnull 	buf = vbuf;
207 a0d146ed 2005-07-12 devnull 	tmp = nil;
208 a0d146ed 2005-07-12 devnull 	freetmp = nil;
209 a0d146ed 2005-07-12 devnull 	icount = count;
210 a0d146ed 2005-07-12 devnull 	opsize = blocksize;
211 a0d146ed 2005-07-12 devnull 
212 a0d146ed 2005-07-12 devnull 	if(count == 0){
213 a0d146ed 2005-07-12 devnull 		logerr(EStrange, "pwrb %s called to %s 0 bytes", name, isread ? "read" : "write");
214 a0d146ed 2005-07-12 devnull 		return 0;
215 a0d146ed 2005-07-12 devnull 	}
216 a0d146ed 2005-07-12 devnull 
217 a0d146ed 2005-07-12 devnull 	assert(blocksize > 0);
218 a0d146ed 2005-07-12 devnull 
219 a0d146ed 2005-07-12 devnull 	/* allocate blocksize-aligned temp buffer if needed */
220 a0d146ed 2005-07-12 devnull 	if((ulong)offset%blocksize || (ulong)buf%blocksize || count%blocksize){
221 a0d146ed 2005-07-12 devnull 		if((freetmp = malloc(blocksize*2)) == nil)
222 a0d146ed 2005-07-12 devnull 			return -1;
223 a0d146ed 2005-07-12 devnull 		tmp = freetmp;
224 a0d146ed 2005-07-12 devnull 		tmp += blocksize - (ulong)tmp%blocksize;
225 a0d146ed 2005-07-12 devnull 	}
226 a0d146ed 2005-07-12 devnull 
227 a0d146ed 2005-07-12 devnull 	/* handle beginning fringe */
228 a0d146ed 2005-07-12 devnull 	if((delta = (ulong)offset%blocksize) != 0){
229 a0d146ed 2005-07-12 devnull 		assert(tmp != nil);
230 a0d146ed 2005-07-12 devnull 		if((r=pread(fd, tmp, blocksize, offset-delta)) != blocksize){
231 a0d146ed 2005-07-12 devnull 			dst = tmp;
232 a0d146ed 2005-07-12 devnull 			offset = offset-delta;
233 a0d146ed 2005-07-12 devnull 			op = "read";
234 a0d146ed 2005-07-12 devnull 			goto Error;
235 a0d146ed 2005-07-12 devnull 		}
236 a0d146ed 2005-07-12 devnull 		c = min(count, blocksize-delta);
237 a0d146ed 2005-07-12 devnull 		assert(c > 0 && c < blocksize);
238 a0d146ed 2005-07-12 devnull 		if(isread)
239 a0d146ed 2005-07-12 devnull 			memmove(buf, tmp+delta, c);
240 a0d146ed 2005-07-12 devnull 		else{
241 a0d146ed 2005-07-12 devnull 			memmove(tmp+delta, buf, c);
242 a0d146ed 2005-07-12 devnull 			if((r=pwrite(fd, tmp, blocksize, offset-delta)) != blocksize){
243 a0d146ed 2005-07-12 devnull 				dst = tmp;
244 a0d146ed 2005-07-12 devnull 				offset = offset-delta;
245 a0d146ed 2005-07-12 devnull 				op = "read";
246 a0d146ed 2005-07-12 devnull 				goto Error;
247 a0d146ed 2005-07-12 devnull 			}
248 a0d146ed 2005-07-12 devnull 		}
249 a0d146ed 2005-07-12 devnull 		assert(c > 0);
250 a0d146ed 2005-07-12 devnull 		offset += c;
251 a0d146ed 2005-07-12 devnull 		buf += c;
252 a0d146ed 2005-07-12 devnull 		count -= c;
253 a0d146ed 2005-07-12 devnull 	}
254 a0d146ed 2005-07-12 devnull 
255 a0d146ed 2005-07-12 devnull 	/* handle full blocks */
256 a0d146ed 2005-07-12 devnull 	while(count >= blocksize){
257 a0d146ed 2005-07-12 devnull 		assert((ulong)offset%blocksize == 0);
258 a0d146ed 2005-07-12 devnull 		if((ulong)buf%blocksize){
259 a0d146ed 2005-07-12 devnull 			assert(tmp != nil);
260 a0d146ed 2005-07-12 devnull 			dst = tmp;
261 a0d146ed 2005-07-12 devnull 			opsize = blocksize;
262 a0d146ed 2005-07-12 devnull 		}else{
263 a0d146ed 2005-07-12 devnull 			dst = buf;
264 a0d146ed 2005-07-12 devnull 			opsize = count - count%blocksize;
265 a0d146ed 2005-07-12 devnull 			if(opsize > MaxIo)
266 a0d146ed 2005-07-12 devnull 				opsize = MaxIo;
267 a0d146ed 2005-07-12 devnull 		}
268 a0d146ed 2005-07-12 devnull 		if(isread){
269 a0d146ed 2005-07-12 devnull 			if((r=pread(fd, dst, opsize, offset))<=0 || r%blocksize){
270 a0d146ed 2005-07-12 devnull 				op = "read";
271 a0d146ed 2005-07-12 devnull 				goto Error;
272 a0d146ed 2005-07-12 devnull 			}
273 a0d146ed 2005-07-12 devnull 			if(dst == tmp){
274 a0d146ed 2005-07-12 devnull 				assert(r == blocksize);
275 a0d146ed 2005-07-12 devnull 				memmove(buf, tmp, blocksize);
276 a0d146ed 2005-07-12 devnull 			}
277 a0d146ed 2005-07-12 devnull 		}else{
278 a0d146ed 2005-07-12 devnull 			if(dst == tmp){
279 a0d146ed 2005-07-12 devnull 				assert(opsize == blocksize);
280 a0d146ed 2005-07-12 devnull 				memmove(dst, buf, blocksize);
281 a0d146ed 2005-07-12 devnull 			}
282 a0d146ed 2005-07-12 devnull 			if((r=pwrite(fd, dst, opsize, offset))<=0 || r%blocksize){
283 a0d146ed 2005-07-12 devnull 				op = "write";
284 a0d146ed 2005-07-12 devnull 				goto Error;
285 a0d146ed 2005-07-12 devnull 			}
286 a0d146ed 2005-07-12 devnull 			if(dst == tmp)
287 a0d146ed 2005-07-12 devnull 				assert(r == blocksize);
288 a0d146ed 2005-07-12 devnull 		}
289 a0d146ed 2005-07-12 devnull 		assert(r > 0);
290 a0d146ed 2005-07-12 devnull 		offset += r;
291 a0d146ed 2005-07-12 devnull 		buf += r;
292 a0d146ed 2005-07-12 devnull 		count -= r;
293 a0d146ed 2005-07-12 devnull 	}
294 a0d146ed 2005-07-12 devnull 
295 a0d146ed 2005-07-12 devnull 	/* handle ending fringe */
296 a0d146ed 2005-07-12 devnull 	if(count > 0){
297 a0d146ed 2005-07-12 devnull 		assert((ulong)offset%blocksize == 0);
298 a0d146ed 2005-07-12 devnull 		assert(tmp != nil);
299 a0d146ed 2005-07-12 devnull 		/*
300 a0d146ed 2005-07-12 devnull 		 * Complicated condition: if we're reading it's okay to get less than
301 a0d146ed 2005-07-12 devnull 		 * a block as long as it's enough to satisfy the read - maybe this is
302 a0d146ed 2005-07-12 devnull 		 * a normal file.  (We never write to normal files, or else things would
303 a0d146ed 2005-07-12 devnull 		 * be even more complicated.)
304 a0d146ed 2005-07-12 devnull 		 */
305 a0d146ed 2005-07-12 devnull 		r = pread(fd, tmp, blocksize, offset);
306 a0d146ed 2005-07-12 devnull 		if((isread && r < count) || (!isread && r != blocksize)){
307 a0d146ed 2005-07-12 devnull print("FAILED isread=%d r=%d count=%d blocksize=%d\n", isread, r, count, blocksize);
308 a0d146ed 2005-07-12 devnull 			dst = tmp;
309 a0d146ed 2005-07-12 devnull 			op = "read";
310 a0d146ed 2005-07-12 devnull 			goto Error;
311 a0d146ed 2005-07-12 devnull 		}
312 a0d146ed 2005-07-12 devnull 		if(isread)
313 a0d146ed 2005-07-12 devnull 			memmove(buf, tmp, count);
314 a0d146ed 2005-07-12 devnull 		else{
315 a0d146ed 2005-07-12 devnull 			memmove(tmp, buf, count);
316 a0d146ed 2005-07-12 devnull 			if(pwrite(fd, tmp, opsize, offset) != blocksize){
317 a0d146ed 2005-07-12 devnull 				dst = tmp;
318 a0d146ed 2005-07-12 devnull 				op = "write";
319 a0d146ed 2005-07-12 devnull 				goto Error;
320 a0d146ed 2005-07-12 devnull 			}
321 a0d146ed 2005-07-12 devnull 		}
322 a0d146ed 2005-07-12 devnull 	}
323 a0d146ed 2005-07-12 devnull 	if(freetmp)
324 a0d146ed 2005-07-12 devnull 		free(freetmp);
325 a0d146ed 2005-07-12 devnull 	return icount;
326 a0d146ed 2005-07-12 devnull 
327 a0d146ed 2005-07-12 devnull Error:
328 a0d146ed 2005-07-12 devnull 	seterr(EAdmin, "%s %s offset 0x%llux count %ud buf %p returned %d: %r",
329 a0d146ed 2005-07-12 devnull 		op, name, offset, opsize, dst, r);
330 a0d146ed 2005-07-12 devnull 	if(freetmp)
331 a0d146ed 2005-07-12 devnull 		free(freetmp);
332 a0d146ed 2005-07-12 devnull 	return -1;
333 a0d146ed 2005-07-12 devnull }
334 a0d146ed 2005-07-12 devnull 
335 a0d146ed 2005-07-12 devnull int
336 a0d146ed 2005-07-12 devnull rwpart(Part *part, int isread, u64int offset, u8int *buf, u32int count)
337 a0d146ed 2005-07-12 devnull {
338 a0d146ed 2005-07-12 devnull 	u32int blocksize;
339 a0d146ed 2005-07-12 devnull 
340 a0d146ed 2005-07-12 devnull 	trace(TraceDisk, "%s %s %ud at 0x%llx", 
341 a0d146ed 2005-07-12 devnull 		isread ? "read" : "write", part->name, count, offset);
342 a0d146ed 2005-07-12 devnull 	if(offset >= part->size || offset+count > part->size){
343 a0d146ed 2005-07-12 devnull 		seterr(EStrange, "out of bounds %s offset 0x%llux count %ud to partition %s size 0x%llux",
344 a0d146ed 2005-07-12 devnull 			isread ? "read" : "write", offset, count, part->name, part->size);
345 a0d146ed 2005-07-12 devnull 		return -1;
346 a0d146ed 2005-07-12 devnull 	}
347 a0d146ed 2005-07-12 devnull 
348 a0d146ed 2005-07-12 devnull 	blocksize = part->fsblocksize;
349 a0d146ed 2005-07-12 devnull 	if(blocksize == 0)
350 a0d146ed 2005-07-12 devnull 		blocksize = part->blocksize;
351 a0d146ed 2005-07-12 devnull 	if(blocksize == 0)
352 a0d146ed 2005-07-12 devnull 		blocksize = 4096;
353 a0d146ed 2005-07-12 devnull 
354 a0d146ed 2005-07-12 devnull 	return prwb(part->filename, part->fd, isread, part->offset+offset, buf, count, blocksize);
355 a0d146ed 2005-07-12 devnull }
356 a0d146ed 2005-07-12 devnull 
357 a0d146ed 2005-07-12 devnull int
358 a0d146ed 2005-07-12 devnull readpart(Part *part, u64int offset, u8int *buf, u32int count)
359 a0d146ed 2005-07-12 devnull {
360 a0d146ed 2005-07-12 devnull 	return rwpart(part, 1, offset, buf, count);
361 a0d146ed 2005-07-12 devnull }
362 a0d146ed 2005-07-12 devnull 
363 a0d146ed 2005-07-12 devnull int
364 a0d146ed 2005-07-12 devnull writepart(Part *part, u64int offset, u8int *buf, u32int count)
365 a0d146ed 2005-07-12 devnull {
366 a0d146ed 2005-07-12 devnull 	return rwpart(part, 0, offset, buf, count);
367 a0d146ed 2005-07-12 devnull }
368 a0d146ed 2005-07-12 devnull 
369 a0d146ed 2005-07-12 devnull ZBlock*
370 a0d146ed 2005-07-12 devnull readfile(char *name)
371 a0d146ed 2005-07-12 devnull {
372 a0d146ed 2005-07-12 devnull 	Part *p;
373 a0d146ed 2005-07-12 devnull 	ZBlock *b;
374 a0d146ed 2005-07-12 devnull 
375 a0d146ed 2005-07-12 devnull 	p = initpart(name, OREAD);
376 a0d146ed 2005-07-12 devnull 	if(p == nil)
377 a0d146ed 2005-07-12 devnull 		return nil;
378 a0d146ed 2005-07-12 devnull 	b = alloczblock(p->size, 0, p->blocksize);
379 a0d146ed 2005-07-12 devnull 	if(b == nil){
380 a0d146ed 2005-07-12 devnull 		seterr(EOk, "can't alloc %s: %r", name);
381 a0d146ed 2005-07-12 devnull 		freepart(p);
382 a0d146ed 2005-07-12 devnull 		return nil;
383 a0d146ed 2005-07-12 devnull 	}
384 a0d146ed 2005-07-12 devnull 	if(readpart(p, 0, b->data, p->size) < 0){
385 a0d146ed 2005-07-12 devnull 		seterr(EOk, "can't read %s: %r", name);
386 a0d146ed 2005-07-12 devnull 		freepart(p);
387 a0d146ed 2005-07-12 devnull 		freezblock(b);
388 a0d146ed 2005-07-12 devnull 		return nil;
389 a0d146ed 2005-07-12 devnull 	}
390 a0d146ed 2005-07-12 devnull 	freepart(p);
391 a0d146ed 2005-07-12 devnull 	return b;
392 a0d146ed 2005-07-12 devnull }
393 a0d146ed 2005-07-12 devnull