more ddf stuff
[thirdparty/mdadm.git] / util.c
1 /*
2 * mdadm - manage Linux "md" devices aka RAID arrays.
3 *
4 * Copyright (C) 2001-2006 Neil Brown <neilb@suse.de>
5 *
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 * Author: Neil Brown
22 * Email: <neilb@cse.unsw.edu.au>
23 * Paper: Neil Brown
24 * School of Computer Science and Engineering
25 * The University of New South Wales
26 * Sydney, 2052
27 * Australia
28 */
29
30 #include "mdadm.h"
31 #include "md_p.h"
32 #include <sys/utsname.h>
33 #include <ctype.h>
34 #include <dirent.h>
35
36 /*
37 * following taken from linux/blkpg.h because they aren't
38 * anywhere else and it isn't safe to #include linux/ * stuff.
39 */
40
41 #define BLKPG _IO(0x12,105)
42
43 /* The argument structure */
44 struct blkpg_ioctl_arg {
45 int op;
46 int flags;
47 int datalen;
48 void *data;
49 };
50
51 /* The subfunctions (for the op field) */
52 #define BLKPG_ADD_PARTITION 1
53 #define BLKPG_DEL_PARTITION 2
54
55 /* Sizes of name fields. Unused at present. */
56 #define BLKPG_DEVNAMELTH 64
57 #define BLKPG_VOLNAMELTH 64
58
59 /* The data structure for ADD_PARTITION and DEL_PARTITION */
60 struct blkpg_partition {
61 long long start; /* starting offset in bytes */
62 long long length; /* length in bytes */
63 int pno; /* partition number */
64 char devname[BLKPG_DEVNAMELTH]; /* partition name, like sda5 or c0d1p2,
65 to be used in kernel messages */
66 char volname[BLKPG_VOLNAMELTH]; /* volume label */
67 };
68
69 /*
70 * Parse a 128 bit uuid in 4 integers
71 * format is 32 hexx nibbles with options :.<space> separator
72 * If not exactly 32 hex digits are found, return 0
73 * else return 1
74 */
75 int parse_uuid(char *str, int uuid[4])
76 {
77 int hit = 0; /* number of Hex digIT */
78 int i;
79 char c;
80 for (i=0; i<4; i++) uuid[i]=0;
81
82 while ((c= *str++)) {
83 int n;
84 if (c>='0' && c<='9')
85 n = c-'0';
86 else if (c>='a' && c <= 'f')
87 n = 10 + c - 'a';
88 else if (c>='A' && c <= 'F')
89 n = 10 + c - 'A';
90 else if (strchr(":. -", c))
91 continue;
92 else return 0;
93
94 if (hit<32) {
95 uuid[hit/8] <<= 4;
96 uuid[hit/8] += n;
97 }
98 hit++;
99 }
100 if (hit == 32)
101 return 1;
102 return 0;
103 }
104
105
106 /*
107 * Get the md version number.
108 * We use the RAID_VERSION ioctl if it is supported
109 * If not, but we have a block device with major '9', we assume
110 * 0.36.0
111 *
112 * Return version number as 24 but number - assume version parts
113 * always < 255
114 */
115
116 int md_get_version(int fd)
117 {
118 struct stat stb;
119 mdu_version_t vers;
120
121 if (fstat(fd, &stb)<0)
122 return -1;
123 if ((S_IFMT&stb.st_mode) != S_IFBLK)
124 return -1;
125
126 if (ioctl(fd, RAID_VERSION, &vers) == 0)
127 return (vers.major*10000) + (vers.minor*100) + vers.patchlevel;
128 if (errno == EACCES)
129 return -1;
130 if (major(stb.st_rdev) == MD_MAJOR)
131 return (3600);
132 return -1;
133 }
134
135 int get_linux_version()
136 {
137 struct utsname name;
138 char *cp;
139 int a,b,c;
140 if (uname(&name) <0)
141 return -1;
142
143 cp = name.release;
144 a = strtoul(cp, &cp, 10);
145 if (*cp != '.') return -1;
146 b = strtoul(cp+1, &cp, 10);
147 if (*cp != '.') return -1;
148 c = strtoul(cp+1, NULL, 10);
149
150 return (a*1000000)+(b*1000)+c;
151 }
152
153 void remove_partitions(int fd)
154 {
155 /* remove partitions from this block devices.
156 * This is used for components added to an array
157 */
158 #ifdef BLKPG_DEL_PARTITION
159 struct blkpg_ioctl_arg a;
160 struct blkpg_partition p;
161
162 a.op = BLKPG_DEL_PARTITION;
163 a.data = (void*)&p;
164 a.datalen = sizeof(p);
165 a.flags = 0;
166 memset(a.data, 0, a.datalen);
167 for (p.pno=0; p.pno < 16; p.pno++)
168 ioctl(fd, BLKPG, &a);
169 #endif
170 }
171
172 int enough(int level, int raid_disks, int layout, int clean,
173 char *avail, int avail_disks)
174 {
175 int copies, first;
176 switch (level) {
177 case 10:
178 /* This is the tricky one - we need to check
179 * which actual disks are present.
180 */
181 copies = (layout&255)* ((layout>>8) & 255);
182 first=0;
183 do {
184 /* there must be one of the 'copies' form 'first' */
185 int n = copies;
186 int cnt=0;
187 while (n--) {
188 if (avail[first])
189 cnt++;
190 first = (first+1) % raid_disks;
191 }
192 if (cnt == 0)
193 return 0;
194
195 } while (first != 0);
196 return 1;
197
198 case -4:
199 return avail_disks>= 1;
200 case -1:
201 case 0:
202 return avail_disks == raid_disks;
203 case 1:
204 return avail_disks >= 1;
205 case 4:
206 case 5:
207 if (clean)
208 return avail_disks >= raid_disks-1;
209 else
210 return avail_disks >= raid_disks;
211 case 6:
212 if (clean)
213 return avail_disks >= raid_disks-2;
214 else
215 return avail_disks >= raid_disks;
216 default:
217 return 0;
218 }
219 }
220
221 int same_uuid(int a[4], int b[4], int swapuuid)
222 {
223 if (swapuuid) {
224 /* parse uuids are hostendian.
225 * uuid's from some superblocks are big-ending
226 * if there is a difference, we need to swap..
227 */
228 unsigned char *ac = (unsigned char *)a;
229 unsigned char *bc = (unsigned char *)b;
230 int i;
231 for (i=0; i<16; i+= 4) {
232 if (ac[i+0] != bc[i+3] ||
233 ac[i+1] != bc[i+2] ||
234 ac[i+2] != bc[i+1] ||
235 ac[i+3] != bc[i+0])
236 return 0;
237 }
238 return 1;
239 } else {
240 if (a[0]==b[0] &&
241 a[1]==b[1] &&
242 a[2]==b[2] &&
243 a[3]==b[3])
244 return 1;
245 return 0;
246 }
247 }
248 void copy_uuid(void *a, int b[4], int swapuuid)
249 {
250 if (swapuuid) {
251 /* parse uuids are hostendian.
252 * uuid's from some superblocks are big-ending
253 * if there is a difference, we need to swap..
254 */
255 unsigned char *ac = (unsigned char *)a;
256 unsigned char *bc = (unsigned char *)b;
257 int i;
258 for (i=0; i<16; i+= 4) {
259 ac[i+0] = bc[i+3];
260 ac[i+1] = bc[i+2];
261 ac[i+2] = bc[i+1];
262 ac[i+3] = bc[i+0];
263 }
264 } else
265 memcpy(a, b, 16);
266 }
267
268 #ifndef MDASSEMBLE
269 int check_ext2(int fd, char *name)
270 {
271 /*
272 * Check for an ext2fs file system.
273 * Superblock is always 1K at 1K offset
274 *
275 * s_magic is le16 at 56 == 0xEF53
276 * report mtime - le32 at 44
277 * blocks - le32 at 4
278 * logblksize - le32 at 24
279 */
280 unsigned char sb[1024];
281 time_t mtime;
282 int size, bsize;
283 if (lseek(fd, 1024,0)!= 1024)
284 return 0;
285 if (read(fd, sb, 1024)!= 1024)
286 return 0;
287 if (sb[56] != 0x53 || sb[57] != 0xef)
288 return 0;
289
290 mtime = sb[44]|(sb[45]|(sb[46]|sb[47]<<8)<<8)<<8;
291 bsize = sb[24]|(sb[25]|(sb[26]|sb[27]<<8)<<8)<<8;
292 size = sb[4]|(sb[5]|(sb[6]|sb[7]<<8)<<8)<<8;
293 fprintf(stderr, Name ": %s appears to contain an ext2fs file system\n",
294 name);
295 fprintf(stderr," size=%dK mtime=%s",
296 size*(1<<bsize), ctime(&mtime));
297 return 1;
298 }
299
300 int check_reiser(int fd, char *name)
301 {
302 /*
303 * superblock is at 64K
304 * size is 1024;
305 * Magic string "ReIsErFs" or "ReIsEr2Fs" at 52
306 *
307 */
308 unsigned char sb[1024];
309 unsigned long size;
310 if (lseek(fd, 64*1024, 0) != 64*1024)
311 return 0;
312 if (read(fd, sb, 1024) != 1024)
313 return 0;
314 if (strncmp((char*)sb+52, "ReIsErFs",8)!=0 &&
315 strncmp((char*)sb+52, "ReIsEr2Fs",9)!=0)
316 return 0;
317 fprintf(stderr, Name ": %s appears to contain a reiserfs file system\n",name);
318 size = sb[0]|(sb[1]|(sb[2]|sb[3]<<8)<<8)<<8;
319 fprintf(stderr, " size = %luK\n", size*4);
320
321 return 1;
322 }
323
324 int check_raid(int fd, char *name)
325 {
326 struct mdinfo info;
327 time_t crtime;
328 char *level;
329 struct supertype *st = guess_super(fd);
330
331 if (!st) return 0;
332 st->ss->load_super(st, fd, name);
333 /* Looks like a raid array .. */
334 fprintf(stderr, Name ": %s appears to be part of a raid array:\n",
335 name);
336 st->ss->getinfo_super(st, &info);
337 st->ss->free_super(st);
338 crtime = info.array.ctime;
339 level = map_num(pers, info.array.level);
340 if (!level) level = "-unknown-";
341 fprintf(stderr, " level=%s devices=%d ctime=%s",
342 level, info.array.raid_disks, ctime(&crtime));
343 return 1;
344 }
345
346 int ask(char *mesg)
347 {
348 char *add = "";
349 int i;
350 for (i=0; i<5; i++) {
351 char buf[100];
352 fprintf(stderr, "%s%s", mesg, add);
353 fflush(stderr);
354 if (fgets(buf, 100, stdin)==NULL)
355 return 0;
356 if (buf[0]=='y' || buf[0]=='Y')
357 return 1;
358 if (buf[0]=='n' || buf[0]=='N')
359 return 0;
360 add = "(y/n) ";
361 }
362 fprintf(stderr, Name ": assuming 'no'\n");
363 return 0;
364 }
365 #endif /* MDASSEMBLE */
366
367 char *map_num(mapping_t *map, int num)
368 {
369 while (map->name) {
370 if (map->num == num)
371 return map->name;
372 map++;
373 }
374 return NULL;
375 }
376
377 int map_name(mapping_t *map, char *name)
378 {
379 while (map->name) {
380 if (strcmp(map->name, name)==0)
381 return map->num;
382 map++;
383 }
384 return UnSet;
385 }
386
387
388 int is_standard(char *dev, int *nump)
389 {
390 /* tests if dev is a "standard" md dev name.
391 * i.e if the last component is "/dNN" or "/mdNN",
392 * where NN is a string of digits
393 */
394 char *d = strrchr(dev, '/');
395 int type=0;
396 int num;
397 if (!d)
398 return 0;
399 if (strncmp(d, "/d",2)==0)
400 d += 2, type=1; /* /dev/md/dN{pM} */
401 else if (strncmp(d, "/md_d", 5)==0)
402 d += 5, type=1; /* /dev/md_dNpM */
403 else if (strncmp(d, "/md", 3)==0)
404 d += 3, type=-1; /* /dev/mdN */
405 else if (d-dev > 3 && strncmp(d-2, "md/", 3)==0)
406 d += 1, type=-1; /* /dev/md/N */
407 else
408 return 0;
409 if (!*d)
410 return 0;
411 num = atoi(d);
412 while (isdigit(*d))
413 d++;
414 if (*d)
415 return 0;
416 if (nump) *nump = num;
417
418 return type;
419 }
420
421
422 /*
423 * convert a major/minor pair for a block device into a name in /dev, if possible.
424 * On the first call, walk /dev collecting name.
425 * Put them in a simple linked listfor now.
426 */
427 struct devmap {
428 int major, minor;
429 char *name;
430 struct devmap *next;
431 } *devlist = NULL;
432 int devlist_ready = 0;
433
434 int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s)
435 {
436 struct stat st;
437 if (S_ISLNK(stb->st_mode)) {
438 stat(name, &st);
439 stb = &st;
440 }
441
442 if ((stb->st_mode&S_IFMT)== S_IFBLK) {
443 char *n = strdup(name);
444 struct devmap *dm = malloc(sizeof(*dm));
445 if (strncmp(n, "/dev/./", 7)==0)
446 strcpy(n+4, name+6);
447 if (dm) {
448 dm->major = major(stb->st_rdev);
449 dm->minor = minor(stb->st_rdev);
450 dm->name = n;
451 dm->next = devlist;
452 devlist = dm;
453 }
454 }
455 return 0;
456 }
457
458 #ifndef HAVE_NFTW
459 #ifdef HAVE_FTW
460 int add_dev_1(const char *name, const struct stat *stb, int flag)
461 {
462 return add_dev(name, stb, flag, NULL);
463 }
464 int nftw(const char *path, int (*han)(const char *name, const struct stat *stb, int flag, struct FTW *s), int nopenfd, int flags)
465 {
466 return ftw(path, add_dev_1, nopenfd);
467 }
468 #else
469 int nftw(const char *path, int (*han)(const char *name, const struct stat *stb, int flag, struct FTW *s), int nopenfd, int flags)
470 {
471 return 0;
472 }
473 #endif /* HAVE_FTW */
474 #endif /* HAVE_NFTW */
475
476 /*
477 * Find a block device with the right major/minor number.
478 * If we find multiple names, choose the shortest.
479 * If we find a non-standard name, it is probably there
480 * deliberately so prefer it over a standard name.
481 * This applies only to names for MD devices.
482 */
483 char *map_dev(int major, int minor, int create)
484 {
485 struct devmap *p;
486 char *std = NULL, *nonstd=NULL;
487 int did_check = 0;
488
489 if (major == 0 && minor == 0)
490 return NULL;
491
492 retry:
493 if (!devlist_ready) {
494 char *dev = "/dev";
495 struct stat stb;
496 while(devlist) {
497 struct devmap *d = devlist;
498 devlist = d->next;
499 free(d->name);
500 free(d);
501 }
502 if (lstat(dev, &stb)==0 &&
503 S_ISLNK(stb.st_mode))
504 dev = "/dev/.";
505 nftw(dev, add_dev, 10, FTW_PHYS);
506 devlist_ready=1;
507 did_check = 1;
508 }
509
510 for (p=devlist; p; p=p->next)
511 if (p->major == major &&
512 p->minor == minor) {
513 if (is_standard(p->name, NULL)) {
514 if (std == NULL ||
515 strlen(p->name) < strlen(std))
516 std = p->name;
517 } else {
518 if (nonstd == NULL ||
519 strlen(p->name) < strlen(nonstd))
520 nonstd = p->name;
521 }
522 }
523 if (!std && !nonstd && !did_check) {
524 devlist_ready = 0;
525 goto retry;
526 }
527 if (create && !std && !nonstd) {
528 static char buf[30];
529 snprintf(buf, sizeof(buf), "%d:%d", major, minor);
530 nonstd = buf;
531 }
532
533 return nonstd ? nonstd : std;
534 }
535
536 unsigned long calc_csum(void *super, int bytes)
537 {
538 unsigned long long newcsum = 0;
539 int i;
540 unsigned int csum;
541 unsigned int *superc = (unsigned int*) super;
542
543 for(i=0; i<bytes/4; i++)
544 newcsum+= superc[i];
545 csum = (newcsum& 0xffffffff) + (newcsum>>32);
546 #ifdef __alpha__
547 /* The in-kernel checksum calculation is always 16bit on
548 * the alpha, though it is 32 bit on i386...
549 * I wonder what it is elsewhere... (it uses and API in
550 * a way that it shouldn't).
551 */
552 csum = (csum & 0xffff) + (csum >> 16);
553 csum = (csum & 0xffff) + (csum >> 16);
554 #endif
555 return csum;
556 }
557
558 #ifndef MDASSEMBLE
559 char *human_size(long long bytes)
560 {
561 static char buf[30];
562
563 /* We convert bytes to either centi-M{ega,ibi}bytes or
564 * centi-G{igi,ibi}bytes, with appropriate rounding,
565 * and then print 1/100th of those as a decimal.
566 * We allow upto 2048Megabytes before converting to
567 * gigabytes, as that shows more precision and isn't
568 * too large a number.
569 * Terrabytes are not yet handled.
570 */
571
572 if (bytes < 5000*1024)
573 buf[0]=0;
574 else if (bytes < 2*1024LL*1024LL*1024LL) {
575 long cMiB = (bytes / ( (1LL<<20) / 200LL ) +1) /2;
576 long cMB = (bytes / ( 1000000LL / 200LL ) +1) /2;
577 snprintf(buf, sizeof(buf), " (%ld.%02ld MiB %ld.%02ld MB)",
578 cMiB/100 , cMiB % 100,
579 cMB/100, cMB % 100);
580 } else {
581 long cGiB = (bytes / ( (1LL<<30) / 200LL ) +1) /2;
582 long cGB = (bytes / (1000000000LL/200LL ) +1) /2;
583 snprintf(buf, sizeof(buf), " (%ld.%02ld GiB %ld.%02ld GB)",
584 cGiB/100 , cGiB % 100,
585 cGB/100, cGB % 100);
586 }
587 return buf;
588 }
589
590 char *human_size_brief(long long bytes)
591 {
592 static char buf[30];
593
594 if (bytes < 5000*1024)
595 snprintf(buf, sizeof(buf), "%ld.%02ldKiB",
596 (long)(bytes>>10), (long)(((bytes&1023)*100+512)/1024)
597 );
598 else if (bytes < 2*1024LL*1024LL*1024LL)
599 snprintf(buf, sizeof(buf), "%ld.%02ldMiB",
600 (long)(bytes>>20),
601 (long)((bytes&0xfffff)+0x100000/200)/(0x100000/100)
602 );
603 else
604 snprintf(buf, sizeof(buf), "%ld.%02ldGiB",
605 (long)(bytes>>30),
606 (long)(((bytes>>10)&0xfffff)+0x100000/200)/(0x100000/100)
607 );
608 return buf;
609 }
610 #endif
611
612 unsigned long long calc_array_size(int level, int raid_disks, int layout,
613 int chunksize, unsigned long long devsize)
614 {
615 int data_disks = 0;
616 switch (level) {
617 case 0: data_disks = raid_disks; break;
618 case 1: data_disks = 1; break;
619 case 4:
620 case 5: data_disks = raid_disks - 1; break;
621 case 6: data_disks = raid_disks - 2; break;
622 case 10: data_disks = raid_disks / (layout & 255) / ((layout>>8)&255);
623 break;
624 }
625 devsize &= ~(unsigned long long)((chunksize>>9)-1);
626 return data_disks * devsize;
627 }
628
629 #if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO)
630 int get_mdp_major(void)
631 {
632 static int mdp_major = -1;
633 FILE *fl;
634 char *w;
635 int have_block = 0;
636 int have_devices = 0;
637 int last_num = -1;
638
639 if (mdp_major != -1)
640 return mdp_major;
641 fl = fopen("/proc/devices", "r");
642 if (!fl)
643 return -1;
644 while ((w = conf_word(fl, 1))) {
645 if (have_block && strcmp(w, "devices:")==0)
646 have_devices = 1;
647 have_block = (strcmp(w, "Block")==0);
648 if (isdigit(w[0]))
649 last_num = atoi(w);
650 if (have_devices && strcmp(w, "mdp")==0)
651 mdp_major = last_num;
652 free(w);
653 }
654 fclose(fl);
655 return mdp_major;
656 }
657
658
659
660 char *get_md_name(int dev)
661 {
662 /* find /dev/md%d or /dev/md/%d or make a device /dev/.tmp.md%d */
663 /* if dev < 0, want /dev/md/d%d or find mdp in /proc/devices ... */
664 static char devname[50];
665 struct stat stb;
666 dev_t rdev;
667 char *dn;
668
669 if (dev < 0) {
670 int mdp = get_mdp_major();
671 if (mdp < 0) return NULL;
672 rdev = makedev(mdp, (-1-dev)<<6);
673 snprintf(devname, sizeof(devname), "/dev/md/d%d", -1-dev);
674 if (stat(devname, &stb) == 0
675 && (S_IFMT&stb.st_mode) == S_IFBLK
676 && (stb.st_rdev == rdev))
677 return devname;
678 } else {
679 rdev = makedev(MD_MAJOR, dev);
680 snprintf(devname, sizeof(devname), "/dev/md%d", dev);
681 if (stat(devname, &stb) == 0
682 && (S_IFMT&stb.st_mode) == S_IFBLK
683 && (stb.st_rdev == rdev))
684 return devname;
685
686 snprintf(devname, sizeof(devname), "/dev/md/%d", dev);
687 if (stat(devname, &stb) == 0
688 && (S_IFMT&stb.st_mode) == S_IFBLK
689 && (stb.st_rdev == rdev))
690 return devname;
691 }
692 dn = map_dev(major(rdev), minor(rdev), 0);
693 if (dn)
694 return dn;
695 snprintf(devname, sizeof(devname), "/dev/.tmp.md%d", dev);
696 if (mknod(devname, S_IFBLK | 0600, rdev) == -1)
697 if (errno != EEXIST)
698 return NULL;
699
700 if (stat(devname, &stb) == 0
701 && (S_IFMT&stb.st_mode) == S_IFBLK
702 && (stb.st_rdev == rdev))
703 return devname;
704 unlink(devname);
705 return NULL;
706 }
707
708 void put_md_name(char *name)
709 {
710 if (strncmp(name, "/dev/.tmp.md", 12)==0)
711 unlink(name);
712 }
713
714 static int dev2major(int d)
715 {
716 if (d >= 0)
717 return MD_MAJOR;
718 else
719 return get_mdp_major();
720 }
721
722 static int dev2minor(int d)
723 {
724 if (d >= 0)
725 return d;
726 return (-1-d) << MdpMinorShift;
727 }
728
729 int find_free_devnum(int use_partitions)
730 {
731 int devnum;
732 for (devnum = 127; devnum != 128;
733 devnum = devnum ? devnum-1 : (1<<22)-1) {
734 char *dn;
735 int _devnum;
736
737 _devnum = use_partitions ? (-1-devnum) : devnum;
738 if (mddev_busy(_devnum))
739 continue;
740 /* make sure it is new to /dev too, at least as a
741 * non-standard */
742 dn = map_dev(dev2major(_devnum), dev2minor(_devnum), 0);
743 if (dn && ! is_standard(dn, NULL))
744 continue;
745 break;
746 }
747 if (devnum == 128)
748 return NoMdDev;
749 return use_partitions ? (-1-devnum) : devnum;
750 }
751 #endif /* !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) */
752
753 int dev_open(char *dev, int flags)
754 {
755 /* like 'open', but if 'dev' matches %d:%d, create a temp
756 * block device and open that
757 */
758 char *e;
759 int fd = -1;
760 char devname[32];
761 int major;
762 int minor;
763
764 if (!dev) return -1;
765
766 major = strtoul(dev, &e, 0);
767 if (e > dev && *e == ':' && e[1] &&
768 (minor = strtoul(e+1, &e, 0)) >= 0 &&
769 *e == 0) {
770 snprintf(devname, sizeof(devname), "/dev/.tmp.md.%d:%d", major, minor);
771 if (mknod(devname, S_IFBLK|0600, makedev(major, minor))==0) {
772 fd = open(devname, flags);
773 unlink(devname);
774 }
775 } else
776 fd = open(dev, flags);
777 return fd;
778 }
779
780 struct superswitch *superlist[] = { &super0, &super1, &super_ddf, NULL };
781
782 #if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO)
783 struct supertype *super_by_fd(int fd)
784 {
785 mdu_array_info_t array;
786 int vers;
787 int minor;
788 struct supertype *st = NULL;
789 struct mdinfo *sra;
790 char *verstr;
791 char version[20];
792 int i;
793
794 sra = sysfs_read(fd, 0, GET_VERSION);
795
796 if (sra) {
797 vers = sra->array.major_version;
798 minor = sra->array.minor_version;
799 verstr = sra->text_version;
800 } else {
801 if (ioctl(fd, GET_ARRAY_INFO, &array))
802 array.major_version = array.minor_version = 0;
803 vers = array.major_version;
804 minor = array.minor_version;
805 verstr = "";
806 }
807
808 if (vers != -1) {
809 sprintf(version, "%d.%d", vers, minor);
810 verstr = version;
811 }
812 for (i = 0; st == NULL && superlist[i] ; i++)
813 st = superlist[i]->match_metadata_desc(verstr);
814
815 if (sra)
816 sysfs_free(sra);
817 if (st)
818 st->sb = NULL;
819 return st;
820 }
821 #endif /* !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) */
822
823
824 struct supertype *dup_super(struct supertype *st)
825 {
826 struct supertype *stnew = NULL;
827 char *verstr = NULL;
828 char version[20];
829 int i;
830
831 if (!st)
832 return st;
833
834 if (st->ss->text_version)
835 strcpy(version, st->ss->text_version);
836 else if (st->minor_version == -1)
837 sprintf(version, "%d", st->ss->major);
838 else
839 sprintf(version, "%d.%d", st->ss->major, st->minor_version);
840 verstr = version;
841
842 for (i = 0; stnew == NULL && superlist[i] ; i++)
843 stnew = superlist[i]->match_metadata_desc(verstr);
844
845 if (stnew)
846 stnew->sb = NULL;
847 return stnew;
848 }
849
850 struct supertype *guess_super(int fd)
851 {
852 /* try each load_super to find the best match,
853 * and return the best superswitch
854 */
855 struct superswitch *ss;
856 struct supertype *st;
857 unsigned long besttime = 0;
858 int bestsuper = -1;
859 int i;
860
861 st = malloc(sizeof(*st));
862 memset(st, 0, sizeof(*st));
863 for (i=0 ; superlist[i]; i++) {
864 int rv;
865 ss = superlist[i];
866 st->ss = NULL;
867 rv = ss->load_super(st, fd, NULL);
868 if (rv == 0) {
869 struct mdinfo info;
870 st->ss->getinfo_super(st, &info);
871 if (bestsuper == -1 ||
872 besttime < info.array.ctime) {
873 bestsuper = i;
874 besttime = info.array.ctime;
875 }
876 ss->free_super(st);
877 }
878 }
879 if (bestsuper != -1) {
880 int rv;
881 st->ss = NULL;
882 rv = superlist[bestsuper]->load_super(st, fd, NULL);
883 if (rv == 0) {
884 superlist[bestsuper]->free_super(st);
885 return st;
886 }
887 }
888 free(st);
889 return NULL;
890 }
891
892 /* Return size of device in bytes */
893 int get_dev_size(int fd, char *dname, unsigned long long *sizep)
894 {
895 unsigned long long ldsize;
896 struct stat st;
897
898 if (fstat(fd, &st) != -1 && S_ISREG(st.st_mode))
899 ldsize = (unsigned long long)st.st_size;
900 else
901 #ifdef BLKGETSIZE64
902 if (ioctl(fd, BLKGETSIZE64, &ldsize) != 0)
903 #endif
904 {
905 unsigned long dsize;
906 if (ioctl(fd, BLKGETSIZE, &dsize) == 0) {
907 ldsize = dsize;
908 ldsize <<= 9;
909 } else {
910 if (dname)
911 fprintf(stderr, Name ": Cannot get size of %s: %s\b",
912 dname, strerror(errno));
913 return 0;
914 }
915 }
916 *sizep = ldsize;
917 return 1;
918 }
919
920 void get_one_disk(int mdfd, mdu_array_info_t *ainf, mdu_disk_info_t *disk)
921 {
922 int d;
923 ioctl(mdfd, GET_ARRAY_INFO, ainf);
924 for (d = 0 ; d < ainf->raid_disks + ainf->nr_disks ; d++)
925 if (ioctl(mdfd, GET_DISK_INFO, disk) == 0)
926 return;
927 }
928
929 int open_container(int fd)
930 {
931 /* 'fd' is a block device. Find out if it is in use
932 * by a container, and return an open fd on that container.
933 */
934 char path[256];
935 char *e;
936 DIR *dir;
937 struct dirent *de;
938 int dfd, n;
939 char buf[200];
940 int major, minor;
941 struct stat st;
942
943 if (fstat(fd, &st) != 0)
944 return -1;
945 sprintf(path, "/sys/dev/block/%d:%d/holders",
946 (int)major(st.st_rdev), (int)minor(st.st_rdev));
947 e = path + strlen(path);
948
949 dir = opendir(path);
950 if (!dir)
951 return -1;
952 while ((de = readdir(dir))) {
953 if (de->d_ino == 0)
954 continue;
955 if (de->d_name[0] == '.')
956 continue;
957 sprintf(e, "/%s/dev", de->d_name);
958 dfd = open(path, O_RDONLY);
959 if (dfd < 0)
960 continue;
961 n = read(dfd, buf, sizeof(buf));
962 close(dfd);
963 if (n <= 0 || n >= sizeof(buf))
964 continue;
965 buf[n] = 0;
966 if (sscanf(buf, "%d:%d", &major, &minor) != 2)
967 continue;
968 sprintf(buf, "%d:%d", major, minor);
969 dfd = dev_open(buf, O_RDONLY);
970 if (dfd >= 0) {
971 closedir(dir);
972 return dfd;
973 }
974 }
975 return -1;
976 }
977
978 #ifdef __TINYC__
979 /* tinyc doesn't optimize this check in ioctl.h out ... */
980 unsigned int __invalid_size_argument_for_IOC = 0;
981 #endif
982