f518aa00dc0f7265fe2bc9bb4255d7714f5bfa07
[multipath-tools/.git] / kpartx / kpartx.c
1 /*
2  * Source: copy of util-linux' partx partx.c
3  *
4  * Copyrights of the original file applies
5  * Copyright (c) 2004, 2005 Christophe Varoqui
6  * Copyright (c) 2005 Kiyoshi Ueda
7  * Copyright (c) 2005 Lars Soltau
8  */
9
10 /*
11  * Given a block device and a partition table type,
12  * try to parse the partition table, and list the
13  * contents. Optionally add or remove partitions.
14  *
15  * Read wholedisk and add all partitions:
16  *      kpartx [-a|-d|-l] [-v] wholedisk
17  *
18  * aeb, 2000-03-21
19  * cva, 2002-10-26
20  */
21
22 #include <stdio.h>
23 #include <fcntl.h>
24 #include <errno.h>
25 #include <stdlib.h>
26 #include <string.h>
27 #include <unistd.h>
28 #include <stdint.h>
29 #include <sys/stat.h>
30 #include <sys/types.h>
31 #include <ctype.h>
32 #include <libdevmapper.h>
33
34 #include "devmapper.h"
35 #include "crc32.h"
36 #include "lopart.h"
37 #include "kpartx.h"
38
39 #define SIZE(a) (sizeof(a)/sizeof((a)[0]))
40
41 #define READ_SIZE       1024
42 #define MAXTYPES        64
43 #define MAXSLICES       256
44 #define DM_TARGET       "linear"
45 #define LO_NAME_SIZE    64
46 #define PARTNAME_SIZE   128
47 #define DELIM_SIZE      8
48
49 struct slice slices[MAXSLICES];
50
51 enum action { LIST, ADD, DELETE };
52
53 struct pt {
54         char *type;
55         ptreader *fn;
56 } pts[MAXTYPES];
57
58 int ptct = 0;
59
60 static void
61 addpts(char *t, ptreader f)
62 {
63         if (ptct >= MAXTYPES) {
64                 fprintf(stderr, "addpts: too many types\n");
65                 exit(1);
66         }
67         pts[ptct].type = t;
68         pts[ptct].fn = f;
69         ptct++;
70 }
71
72 static void
73 initpts(void)
74 {
75         addpts("gpt", read_gpt_pt);
76         addpts("dos", read_dos_pt);
77         addpts("bsd", read_bsd_pt);
78         addpts("solaris", read_solaris_pt);
79         addpts("unixware", read_unixware_pt);
80         addpts("dasd", read_dasd_pt);
81         addpts("mac", read_mac_pt);
82         addpts("sun", read_sun_pt);
83 }
84
85 static char short_opts[] = "rladgvp:t:s";
86
87 /* Used in gpt.c */
88 int force_gpt=0;
89
90 static int
91 usage(void) {
92         printf("usage : kpartx [-a|-d|-l] [-v] wholedisk\n");
93         printf("\t-a add partition devmappings\n");
94         printf("\t-r devmappings will be readonly\n");
95         printf("\t-d del partition devmappings\n");
96         printf("\t-l list partitions devmappings that would be added by -a\n");
97         printf("\t-p set device name-partition number delimiter\n");
98         printf("\t-g force GUID partition table (GPT)\n");
99         printf("\t-v verbose\n");
100         printf("\t-s sync mode. Don't return until the partitions are created\n");
101         return 1;
102 }
103
104 static void
105 set_delimiter (char * device, char * delimiter)
106 {
107         char * p = device;
108
109         while (*(p++) != 0x0)
110                 continue;
111
112         if (isdigit(*(p - 2)))
113                 *delimiter = 'p';
114 }
115
116 static void
117 strip_slash (char * device)
118 {
119         char * p = device;
120
121         while (*(p++) != 0x0) {
122
123                 if (*p == '/')
124                         *p = '!';
125         }
126 }
127
128 static int
129 find_devname_offset (char * device)
130 {
131         char *p, *q = NULL;
132
133         p = device;
134
135         while (*p++)
136                 if (*p == '/')
137                         q = p;
138
139         return (int)(q - device) + 1;
140 }
141
142 static char *
143 get_hotplug_device(void)
144 {
145         unsigned int major, minor, off, len;
146         const char *mapname;
147         char *devname = NULL;
148         char *device = NULL;
149         char *var = NULL;
150         struct stat buf;
151
152         var = getenv("ACTION");
153
154         if (!var || strcmp(var, "add"))
155                 return NULL;
156
157         /* Get dm mapname for hotpluged device. */
158         if (!(devname = getenv("DEVNAME")))
159                 return NULL;
160
161         if (stat(devname, &buf))
162                 return NULL;
163
164         major = (unsigned int)MAJOR(buf.st_rdev);
165         minor = (unsigned int)MINOR(buf.st_rdev);
166
167         if (!(mapname = dm_mapname(major, minor))) /* Not dm device. */
168                 return NULL;
169
170         off = find_devname_offset(devname);
171         len = strlen(mapname);
172
173         /* Dirname + mapname + \0 */
174         if (!(device = (char *)malloc(sizeof(char) * (off + len + 1))))
175                 return NULL;
176
177         /* Create new device name. */
178         snprintf(device, off + 1, "%s", devname);
179         snprintf(device + off, len + 1, "%s", mapname);
180
181         if (strlen(device) != (off + len))
182                 return NULL;
183
184         return device;
185 }
186
187 int
188 main(int argc, char **argv){
189         int fd, i, j, m, n, op, off, arg, c, d, ro=0;
190         struct slice all;
191         struct pt *ptp;
192         enum action what = LIST;
193         char *type, *diskdevice, *device, *progname;
194         int verbose = 0;
195         char partname[PARTNAME_SIZE], params[PARTNAME_SIZE + 16];
196         char * loopdev = NULL;
197         char * delim = NULL;
198         char *uuid = NULL;
199         char *mapname = NULL;
200         int loopro = 0;
201         int hotplug = 0;
202         int loopcreated = 0;
203         int sync = 0;
204         struct stat buf;
205         uint32_t cookie = 0;
206
207         initpts();
208         init_crc32();
209
210         type = device = diskdevice = NULL;
211         memset(&all, 0, sizeof(all));
212         memset(&partname, 0, sizeof(partname));
213
214         /* Check whether hotplug mode. */
215         progname = strrchr(argv[0], '/');
216
217         if (!progname)
218                 progname = argv[0];
219         else
220                 progname++;
221
222         if (!strcmp(progname, "kpartx.dev")) { /* Hotplug mode */
223                 hotplug = 1;
224
225                 /* Setup for original kpartx variables */
226                 if (!(device = get_hotplug_device()))
227                         exit(1);
228
229                 diskdevice = device;
230                 what = ADD;
231         } else if (argc < 2) {
232                 usage();
233                 exit(1);
234         }
235
236         while ((arg = getopt(argc, argv, short_opts)) != EOF) switch(arg) {
237                 case 'r':
238                         ro=1;
239                         break;
240                 case 'g':
241                         force_gpt=1;
242                         break;
243                 case 't':
244                         type = optarg;
245                         break;
246                 case 'v':
247                         verbose = 1;
248                         break;
249                 case 'p':
250                         delim = optarg;
251                         break;
252                 case 'l':
253                         what = LIST;
254                         break;
255                 case 'a':
256                         what = ADD;
257                         break;
258                 case 'd':
259                         what = DELETE;
260                         break;
261                 case 's':
262                         sync = 1;
263                         break;
264                 default:
265                         usage();
266                         exit(1);
267         }
268
269         if (!sync)
270                 dm_udev_set_sync_support(0);
271
272         if (dm_prereq(DM_TARGET, 0, 0, 0) && (what == ADD || what == DELETE)) {
273                 fprintf(stderr, "device mapper prerequisites not met\n");
274                 exit(1);
275         }
276
277         if (hotplug) {
278                 /* already got [disk]device */
279         } else if (optind == argc-2) {
280                 device = argv[optind];
281                 diskdevice = argv[optind+1];
282         } else if (optind == argc-1) {
283                 diskdevice = device = argv[optind];
284         } else {
285                 usage();
286                 exit(1);
287         }
288
289         if (stat(device, &buf)) {
290                 printf("failed to stat() %s\n", device);
291                 exit (1);
292         }
293
294         if (S_ISREG (buf.st_mode)) {
295                 /* already looped file ? */
296                 loopdev = find_loop_by_file(device);
297
298                 if (!loopdev && what == DELETE)
299                         exit (0);
300
301                 if (!loopdev) {
302                         loopdev = find_unused_loop_device();
303
304                         if (set_loop(loopdev, device, 0, &loopro)) {
305                                 fprintf(stderr, "can't set up loop\n");
306                                 exit (1);
307                         }
308                         loopcreated = 1;
309                 }
310                 device = loopdev;
311         }
312
313         if (delim == NULL) {
314                 delim = malloc(DELIM_SIZE);
315                 memset(delim, 0, DELIM_SIZE);
316                 set_delimiter(device, delim);
317         }
318
319         off = find_devname_offset(device);
320
321         if (!loopdev) {
322                 uuid = dm_mapuuid((unsigned int)MAJOR(buf.st_rdev),
323                                   (unsigned int)MINOR(buf.st_rdev));
324                 mapname = dm_mapname((unsigned int)MAJOR(buf.st_rdev),
325                                      (unsigned int)MINOR(buf.st_rdev));
326         }
327
328         if (!uuid)
329                 uuid = device + off;
330
331         if (!mapname)
332                 mapname = device + off;
333
334         fd = open(device, O_RDONLY);
335
336         if (fd == -1) {
337                 perror(device);
338                 exit(1);
339         }
340
341         /* add/remove partitions to the kernel devmapper tables */
342         int r = 0;
343         for (i = 0; i < ptct; i++) {
344                 ptp = &pts[i];
345
346                 if (type && strcmp(type, ptp->type))
347                         continue;
348
349                 /* here we get partitions */
350                 n = ptp->fn(fd, all, slices, SIZE(slices));
351
352 #ifdef DEBUG
353                 if (n >= 0)
354                         printf("%s: %d slices\n", ptp->type, n);
355 #endif
356
357                 if (n > 0)
358                         close(fd);
359                 else
360                         continue;
361
362                 switch(what) {
363                 case LIST:
364                         for (j = 0, c = 0, m = 0; j < n; j++) {
365                                 if (slices[j].size == 0)
366                                         continue;
367                                 if (slices[j].container > 0) {
368                                         c++;
369                                         continue;
370                                 }
371
372                                 slices[j].minor = m++;
373
374                                 printf("%s%s%d : 0 %" PRIu64 " %s %" PRIu64"\n",
375                                        mapname, delim, j+1,
376                                        slices[j].size, device,
377                                        slices[j].start);
378                         }
379                         /* Loop to resolve contained slices */
380                         d = c;
381                         while (c) {
382                                 for (j = 0; j < n; j++) {
383                                         uint64_t start;
384                                         int k = slices[j].container - 1;
385
386                                         if (slices[j].size == 0)
387                                                 continue;
388                                         if (slices[j].minor > 0)
389                                                 continue;
390                                         if (slices[j].container == 0)
391                                                 continue;
392                                         slices[j].minor = m++;
393
394                                         start = slices[j].start - slices[k].start;
395                                         printf("%s%s%d : 0 %" PRIu64 " /dev/dm-%d %" PRIu64 "\n",
396                                                mapname, delim, j+1,
397                                                slices[j].size,
398                                                slices[k].minor, start);
399                                         c--;
400                                 }
401                                 /* Terminate loop if nothing more to resolve */
402                                 if (d == c)
403                                         break;
404                         }
405
406                         if (loopcreated && S_ISREG (buf.st_mode)) {
407                                 if (del_loop(device)) {
408                                         if (verbose)
409                                                 printf("can't del loop : %s\n",
410                                                         device);
411                                         exit(1);
412                                 }
413                                 printf("loop deleted : %s\n", device);
414                         }
415                         break;
416
417                 case DELETE:
418                         for (j = n-1; j >= 0; j--) {
419                                 if (safe_sprintf(partname, "%s%s%d",
420                                              mapname, delim, j+1)) {
421                                         fprintf(stderr, "partname too small\n");
422                                         exit(1);
423                                 }
424                                 strip_slash(partname);
425
426                                 if (!slices[j].size || !dm_map_present(partname))
427                                         continue;
428
429                                 if (!dm_simplecmd(DM_DEVICE_REMOVE, partname,
430                                                   0, &cookie)) {
431                                         r++;
432                                         continue;
433                                 }
434                                 if (verbose)
435                                         printf("del devmap : %s\n", partname);
436                         }
437
438                         if (S_ISREG (buf.st_mode)) {
439                                 if (del_loop(device)) {
440                                         if (verbose)
441                                                 printf("can't del loop : %s\n",
442                                                         device);
443                                         exit(1);
444                                 }
445                                 printf("loop deleted : %s\n", device);
446                         }
447                         break;
448
449                 case ADD:
450                         for (j = 0, c = 0; j < n; j++) {
451                                 if (slices[j].size == 0)
452                                         continue;
453
454                                 /* Skip all contained slices */
455                                 if (slices[j].container > 0) {
456                                         c++;
457                                         continue;
458                                 }
459
460                                 if (safe_sprintf(partname, "%s%s%d",
461                                              mapname, delim, j+1)) {
462                                         fprintf(stderr, "partname too small\n");
463                                         exit(1);
464                                 }
465                                 strip_slash(partname);
466
467                                 if (safe_sprintf(params, "%s %" PRIu64 ,
468                                                  device, slices[j].start)) {
469                                         fprintf(stderr, "params too small\n");
470                                         exit(1);
471                                 }
472
473                                 op = (dm_map_present(partname) ?
474                                         DM_DEVICE_RELOAD : DM_DEVICE_CREATE);
475
476                                 if (!dm_addmap(op, partname, DM_TARGET, params,
477                                                slices[j].size, ro, uuid, j+1,
478                                                buf.st_mode & 0777, buf.st_uid,
479                                                buf.st_gid, &cookie)) {
480                                         fprintf(stderr, "create/reload failed on %s\n",
481                                                 partname);
482                                         r++;
483                                 }
484                                 if (op == DM_DEVICE_RELOAD &&
485                                     !dm_simplecmd(DM_DEVICE_RESUME, partname,
486                                                   1, &cookie)) {
487                                         fprintf(stderr, "resume failed on %s\n",
488                                                 partname);
489                                         r++;
490                                 }
491                                 dm_devn(partname, &slices[j].major,
492                                         &slices[j].minor);
493
494                                 if (verbose)
495                                         printf("add map %s (%d:%d): 0 %" PRIu64 " %s %s\n",
496                                                partname, slices[j].major,
497                                                slices[j].minor, slices[j].size,
498                                                DM_TARGET, params);
499                         }
500                         /* Loop to resolve contained slices */
501                         d = c;
502                         while (c) {
503                                 for (j = 0; j < n; j++) {
504                                         uint64_t start;
505                                         int k = slices[j].container - 1;
506
507                                         if (slices[j].size == 0)
508                                                 continue;
509
510                                         /* Skip all existing slices */
511                                         if (slices[j].minor > 0)
512                                                 continue;
513
514                                         /* Skip all simple slices */
515                                         if (slices[j].container == 0)
516                                                 continue;
517
518                                         /* Check container slice */
519                                         if (slices[k].size == 0)
520                                                 fprintf(stderr, "Invalid slice %d\n",
521                                                         k);
522
523                                         if (safe_sprintf(partname, "%s%s%d",
524                                                          mapname, delim, j+1)) {
525                                                 fprintf(stderr, "partname too small\n");
526                                                 exit(1);
527                                         }
528                                         strip_slash(partname);
529
530                                         start = slices[j].start - slices[k].start;
531                                         if (safe_sprintf(params, "%d:%d %" PRIu64,
532                                                          slices[k].major,
533                                                          slices[k].minor,
534                                                          start)) {
535                                                 fprintf(stderr, "params too small\n");
536                                                 exit(1);
537                                         }
538
539                                         op = (dm_map_present(partname) ?
540                                               DM_DEVICE_RELOAD : DM_DEVICE_CREATE);
541
542                                         dm_addmap(op, partname, DM_TARGET, params,
543                                                   slices[j].size, ro, uuid, j+1,
544                                                   buf.st_mode & 0777,
545                                                   buf.st_uid, buf.st_gid,
546                                                   &cookie);
547
548                                         if (op == DM_DEVICE_RELOAD)
549                                                 dm_simplecmd(DM_DEVICE_RESUME,
550                                                              partname, 1,
551                                                              &cookie);
552
553                                         dm_devn(partname, &slices[j].major,
554                                                 &slices[j].minor);
555
556                                         if (verbose)
557                                                 printf("add map %s : 0 %" PRIu64 " %s %s\n",
558                                                        partname, slices[j].size,
559                                                        DM_TARGET, params);
560                                         c--;
561                                 }
562                                 /* Terminate loop */
563                                 if (d == c)
564                                         break;
565                         }
566                         break;
567
568                 default:
569                         break;
570
571                 }
572                 if (n > 0)
573                         break;
574         }
575         dm_udev_wait(cookie);
576         dm_lib_release();
577         dm_lib_exit();
578
579         return r;
580 }
581
582 void *
583 xmalloc (size_t size) {
584         void *t;
585
586         if (size == 0)
587                 return NULL;
588
589         t = malloc (size);
590
591         if (t == NULL) {
592                 fprintf(stderr, "Out of memory\n");
593                 exit(1);
594         }
595
596         return t;
597 }
598
599 /*
600  * sseek: seek to specified sector
601  */
602
603 static int
604 sseek(int fd, unsigned int secnr) {
605         off64_t in, out;
606         in = ((off64_t) secnr << 9);
607         out = 1;
608
609         if ((out = lseek64(fd, in, SEEK_SET)) != in)
610         {
611                 fprintf(stderr, "llseek error\n");
612                 return -1;
613         }
614         return 0;
615 }
616
617 static
618 struct block {
619         unsigned int secnr;
620         char *block;
621         struct block *next;
622 } *blockhead;
623
624 char *
625 getblock (int fd, unsigned int secnr) {
626         struct block *bp;
627
628         for (bp = blockhead; bp; bp = bp->next)
629
630                 if (bp->secnr == secnr)
631                         return bp->block;
632
633         if (sseek(fd, secnr))
634                 return NULL;
635
636         bp = xmalloc(sizeof(struct block));
637         bp->secnr = secnr;
638         bp->next = blockhead;
639         blockhead = bp;
640         bp->block = (char *) xmalloc(READ_SIZE);
641
642         if (read(fd, bp->block, READ_SIZE) != READ_SIZE) {
643                 fprintf(stderr, "read error, sector %d\n", secnr);
644                 bp->block = NULL;
645         }
646
647         return bp->block;
648 }