config: fix handing of 'homehost' in AUTO line.
[thirdparty/mdadm.git] / util.c
CommitLineData
64c4757e 1/*
9a9dab36 2 * mdadm - manage Linux "md" devices aka RAID arrays.
64c4757e 3 *
e736b623 4 * Copyright (C) 2001-2009 Neil Brown <neilb@suse.de>
64c4757e
NB
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
e736b623 22 * Email: <neilb@suse.de>
64c4757e
NB
23 */
24
9a9dab36 25#include "mdadm.h"
64c4757e 26#include "md_p.h"
edd8d13c 27#include <sys/socket.h>
64c4757e 28#include <sys/utsname.h>
9fe32043 29#include <sys/wait.h>
edd8d13c 30#include <sys/un.h>
98c6faba 31#include <ctype.h>
a322f70c 32#include <dirent.h>
a931db9e 33#include <signal.h>
0a816ef9 34
a0963a86
JS
35int __offroot;
36
0a816ef9
NB
37/*
38 * following taken from linux/blkpg.h because they aren't
39 * anywhere else and it isn't safe to #include linux/ * stuff.
40 */
41
42#define BLKPG _IO(0x12,105)
43
44/* The argument structure */
45struct blkpg_ioctl_arg {
46 int op;
47 int flags;
48 int datalen;
49 void *data;
50};
51
52/* The subfunctions (for the op field) */
53#define BLKPG_ADD_PARTITION 1
54#define BLKPG_DEL_PARTITION 2
55
56/* Sizes of name fields. Unused at present. */
57#define BLKPG_DEVNAMELTH 64
58#define BLKPG_VOLNAMELTH 64
59
60/* The data structure for ADD_PARTITION and DEL_PARTITION */
61struct blkpg_partition {
62 long long start; /* starting offset in bytes */
63 long long length; /* length in bytes */
64 int pno; /* partition number */
65 char devname[BLKPG_DEVNAMELTH]; /* partition name, like sda5 or c0d1p2,
66 to be used in kernel messages */
67 char volname[BLKPG_VOLNAMELTH]; /* volume label */
68};
64c4757e 69
0f22b998 70#include "part.h"
056b331e
N
71
72/* Force a compilation error if condition is true */
73#define BUILD_BUG_ON(condition) ((void)BUILD_BUG_ON_ZERO(condition))
74
75/* Force a compilation error if condition is true, but also produce a
76 result (of value 0 and type size_t), so the expression can be used
77 e.g. in a structure initializer (or where-ever else comma expressions
78 aren't permitted). */
79#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
80
64c4757e
NB
81/*
82 * Parse a 128 bit uuid in 4 integers
83 * format is 32 hexx nibbles with options :.<space> separator
84 * If not exactly 32 hex digits are found, return 0
85 * else return 1
86 */
87int parse_uuid(char *str, int uuid[4])
88{
aba69144
NB
89 int hit = 0; /* number of Hex digIT */
90 int i;
91 char c;
92 for (i=0; i<4; i++) uuid[i]=0;
93
94 while ((c= *str++)) {
95 int n;
96 if (c>='0' && c<='9')
97 n = c-'0';
98 else if (c>='a' && c <= 'f')
99 n = 10 + c - 'a';
100 else if (c>='A' && c <= 'F')
101 n = 10 + c - 'A';
102 else if (strchr(":. -", c))
103 continue;
104 else return 0;
105
106 if (hit<32) {
107 uuid[hit/8] <<= 4;
108 uuid[hit/8] += n;
109 }
110 hit++;
82b27616 111 }
aba69144
NB
112 if (hit == 32)
113 return 1;
114 return 0;
64c4757e
NB
115}
116
117
118/*
119 * Get the md version number.
120 * We use the RAID_VERSION ioctl if it is supported
121 * If not, but we have a block device with major '9', we assume
122 * 0.36.0
123 *
124 * Return version number as 24 but number - assume version parts
125 * always < 255
126 */
127
128int md_get_version(int fd)
129{
130 struct stat stb;
131 mdu_version_t vers;
132
133 if (fstat(fd, &stb)<0)
134 return -1;
135 if ((S_IFMT&stb.st_mode) != S_IFBLK)
136 return -1;
137
138 if (ioctl(fd, RAID_VERSION, &vers) == 0)
682c7051 139 return (vers.major*10000) + (vers.minor*100) + vers.patchlevel;
5787fa49
NB
140 if (errno == EACCES)
141 return -1;
0df46c2a 142 if (major(stb.st_rdev) == MD_MAJOR)
682c7051 143 return (3600);
64c4757e
NB
144 return -1;
145}
146
64c4757e
NB
147int get_linux_version()
148{
149 struct utsname name;
98c6faba 150 char *cp;
f161d047 151 int a = 0, b = 0,c = 0;
64c4757e
NB
152 if (uname(&name) <0)
153 return -1;
154
98c6faba
NB
155 cp = name.release;
156 a = strtoul(cp, &cp, 10);
f161d047
N
157 if (*cp == '.')
158 b = strtoul(cp+1, &cp, 10);
159 if (*cp == '.')
160 c = strtoul(cp+1, &cp, 10);
98c6faba 161
682c7051 162 return (a*1000000)+(b*1000)+c;
64c4757e
NB
163}
164
71204a50 165#ifndef MDASSEMBLE
bc77ed53
DW
166int mdadm_version(char *version)
167{
168 int a, b, c;
169 char *cp;
170
171 if (!version)
172 version = Version;
173
174 cp = strchr(version, '-');
175 if (!cp || *(cp+1) != ' ' || *(cp+2) != 'v')
176 return -1;
177 cp += 3;
178 a = strtoul(cp, &cp, 10);
179 if (*cp != '.')
180 return -1;
181 b = strtoul(cp+1, &cp, 10);
182 if (*cp == '.')
183 c = strtoul(cp+1, &cp, 10);
184 else
185 c = 0;
186 if (*cp != ' ' && *cp != '-')
187 return -1;
188 return (a*1000000)+(b*1000)+c;
189}
190
84e11361
N
191long long parse_size(char *size)
192{
193 /* parse 'size' which should be a number optionally
194 * followed by 'K', 'M', or 'G'.
195 * Without a suffix, K is assumed.
196 * Number returned is in sectors (half-K)
197 */
198 char *c;
199 long long s = strtoll(size, &c, 10);
200 if (s > 0) {
201 switch (*c) {
202 case 'K':
203 c++;
204 default:
205 s *= 2;
206 break;
207 case 'M':
208 c++;
209 s *= 1024 * 2;
210 break;
211 case 'G':
212 c++;
213 s *= 1024 * 1024 * 2;
214 break;
215 }
216 }
217 if (*c)
218 s = 0;
219 return s;
220}
221
4a06e2c2
N
222int parse_layout_10(char *layout)
223{
224 int copies, rv;
225 char *cp;
226 /* Parse the layout string for raid10 */
227 /* 'f', 'o' or 'n' followed by a number <= raid_disks */
228 if ((layout[0] != 'n' && layout[0] != 'f' && layout[0] != 'o') ||
229 (copies = strtoul(layout+1, &cp, 10)) < 1 ||
230 copies > 200 ||
231 *cp)
232 return -1;
233 if (layout[0] == 'n')
234 rv = 256 + copies;
235 else if (layout[0] == 'o')
236 rv = 0x10000 + (copies<<8) + 1;
237 else
238 rv = 1 + (copies<<8);
239 return rv;
240}
241
242int parse_layout_faulty(char *layout)
243{
244 /* Parse the layout string for 'faulty' */
245 int ln = strcspn(layout, "0123456789");
246 char *m = strdup(layout);
247 int mode;
248 m[ln] = 0;
249 mode = map_name(faultylayout, m);
250 if (mode == UnSet)
251 return -1;
252
253 return mode | (atoi(layout+ln)<< ModeShift);
254}
eb3929a4 255#endif
4a06e2c2 256
0430ed48
NB
257void remove_partitions(int fd)
258{
259 /* remove partitions from this block devices.
260 * This is used for components added to an array
261 */
262#ifdef BLKPG_DEL_PARTITION
263 struct blkpg_ioctl_arg a;
264 struct blkpg_partition p;
265
266 a.op = BLKPG_DEL_PARTITION;
267 a.data = (void*)&p;
268 a.datalen = sizeof(p);
269 a.flags = 0;
270 memset(a.data, 0, a.datalen);
271 for (p.pno=0; p.pno < 16; p.pno++)
272 ioctl(fd, BLKPG, &a);
273#endif
274}
275
691c6ee1
N
276int test_partition(int fd)
277{
278 /* Check if fd is a whole-disk or a partition.
279 * BLKPG will return EINVAL on a partition, and BLKPG_DEL_PARTITION
280 * will return ENXIO on an invalid partition number.
281 */
282 struct blkpg_ioctl_arg a;
283 struct blkpg_partition p;
284 a.op = BLKPG_DEL_PARTITION;
285 a.data = (void*)&p;
286 a.datalen = sizeof(p);
287 a.flags = 0;
288 memset(a.data, 0, a.datalen);
289 p.pno = 1<<30;
290 if (ioctl(fd, BLKPG, &a) == 0)
291 /* Very unlikely, but not a partition */
292 return 0;
293 if (errno == ENXIO)
294 /* not a partition */
295 return 0;
296
297 return 1;
298}
299
bfd76b93
CA
300int test_partition_from_id(dev_t id)
301{
302 char buf[20];
303 int fd, rv;
304
305 sprintf(buf, "%d:%d", major(id), minor(id));
306 fd = dev_open(buf, O_RDONLY);
307 if (fd < 0)
308 return -1;
309 rv = test_partition(fd);
310 close(fd);
311 return rv;
312}
691c6ee1 313
de5a472e 314int enough(int level, int raid_disks, int layout, int clean, char *avail)
64c4757e 315{
265e0f17 316 int copies, first;
de5a472e
N
317 int i;
318 int avail_disks = 0;
319
320 for (i = 0; i < raid_disks; i++)
321 avail_disks += !!avail[i];
322
64c4757e 323 switch (level) {
265e0f17
NB
324 case 10:
325 /* This is the tricky one - we need to check
326 * which actual disks are present.
327 */
702b557b 328 copies = (layout&255)* ((layout>>8) & 255);
265e0f17
NB
329 first=0;
330 do {
331 /* there must be one of the 'copies' form 'first' */
332 int n = copies;
333 int cnt=0;
334 while (n--) {
335 if (avail[first])
336 cnt++;
337 first = (first+1) % raid_disks;
338 }
339 if (cnt == 0)
340 return 0;
341
342 } while (first != 0);
343 return 1;
e5329c37 344
df0d4ea0 345 case LEVEL_MULTIPATH:
e0d19036 346 return avail_disks>= 1;
df0d4ea0 347 case LEVEL_LINEAR:
64c4757e
NB
348 case 0:
349 return avail_disks == raid_disks;
350 case 1:
351 return avail_disks >= 1;
352 case 4:
353 case 5:
583315d9
NB
354 if (clean)
355 return avail_disks >= raid_disks-1;
356 else
357 return avail_disks >= raid_disks;
98c6faba 358 case 6:
583315d9
NB
359 if (clean)
360 return avail_disks >= raid_disks-2;
361 else
362 return avail_disks >= raid_disks;
64c4757e
NB
363 default:
364 return 0;
365 }
366}
367
8453e704
N
368int enough_fd(int fd)
369{
370 struct mdu_array_info_s array;
371 struct mdu_disk_info_s disk;
372 int avail_disks = 0;
aabe020d 373 int i, rv;
8453e704
N
374 char *avail;
375
376 if (ioctl(fd, GET_ARRAY_INFO, &array) != 0 ||
377 array.raid_disks <= 0)
378 return 0;
379 avail = calloc(array.raid_disks, 1);
9e6d9291 380 for (i=0; i < 1024 && array.nr_disks > 0; i++) {
8453e704
N
381 disk.number = i;
382 if (ioctl(fd, GET_DISK_INFO, &disk) != 0)
383 continue;
9e6d9291
N
384 if (disk.major == 0 && disk.minor == 0)
385 continue;
386 array.nr_disks--;
387
8453e704
N
388 if (! (disk.state & (1<<MD_DISK_SYNC)))
389 continue;
390 if (disk.raid_disk < 0 || disk.raid_disk >= array.raid_disks)
391 continue;
392 avail_disks++;
393 avail[disk.raid_disk] = 1;
394 }
395 /* This is used on an active array, so assume it is clean */
aabe020d 396 rv = enough(array.level, array.raid_disks, array.layout,
de5a472e 397 1, avail);
aabe020d
JS
398 free(avail);
399 return rv;
8453e704
N
400}
401
402
22e263f6
AC
403const int uuid_zero[4] = { 0, 0, 0, 0 };
404
f277ce36 405int same_uuid(int a[4], int b[4], int swapuuid)
64c4757e 406{
f277ce36
NB
407 if (swapuuid) {
408 /* parse uuids are hostendian.
409 * uuid's from some superblocks are big-ending
aba69144 410 * if there is a difference, we need to swap..
f277ce36
NB
411 */
412 unsigned char *ac = (unsigned char *)a;
413 unsigned char *bc = (unsigned char *)b;
414 int i;
415 for (i=0; i<16; i+= 4) {
416 if (ac[i+0] != bc[i+3] ||
417 ac[i+1] != bc[i+2] ||
418 ac[i+2] != bc[i+1] ||
419 ac[i+3] != bc[i+0])
420 return 0;
421 }
422 return 1;
423 } else {
424 if (a[0]==b[0] &&
425 a[1]==b[1] &&
426 a[2]==b[2] &&
427 a[3]==b[3])
428 return 1;
429 return 0;
430 }
64c4757e 431}
350f29f9
NB
432void copy_uuid(void *a, int b[4], int swapuuid)
433{
434 if (swapuuid) {
435 /* parse uuids are hostendian.
436 * uuid's from some superblocks are big-ending
437 * if there is a difference, we need to swap..
438 */
439 unsigned char *ac = (unsigned char *)a;
440 unsigned char *bc = (unsigned char *)b;
441 int i;
442 for (i=0; i<16; i+= 4) {
443 ac[i+0] = bc[i+3];
444 ac[i+1] = bc[i+2];
445 ac[i+2] = bc[i+1];
446 ac[i+3] = bc[i+0];
447 }
448 } else
449 memcpy(a, b, 16);
450}
64c4757e 451
aae5a112 452char *__fname_from_uuid(int id[4], int swap, char *buf, char sep)
d7288ddc 453{
9968e376 454 int i, j;
d7288ddc
N
455 char uuid[16];
456 char *c = buf;
457 strcpy(c, "UUID-");
458 c += strlen(c);
aae5a112 459 copy_uuid(uuid, id, swap);
9968e376 460 for (i = 0; i < 4; i++) {
9968e376 461 if (i)
ff54de6e 462 *c++ = sep;
9968e376
DW
463 for (j = 3; j >= 0; j--) {
464 sprintf(c,"%02x", (unsigned char) uuid[j+4*i]);
465 c+= 2;
466 }
d7288ddc
N
467 }
468 return buf;
aae5a112
DW
469
470}
471
472char *fname_from_uuid(struct supertype *st, struct mdinfo *info, char *buf, char sep)
473{
86983cce
N
474 // dirty hack to work around an issue with super1 superblocks...
475 // super1 superblocks need swapuuid set in order for assembly to
476 // work, but can't have it set if we want this printout to match
477 // all the other uuid printouts in super1.c, so we force swapuuid
478 // to 1 to make our printout match the rest of super1
479 return __fname_from_uuid(info->uuid, (st->ss == &super1) ? 1 : st->ss->swapuuid, buf, sep);
d7288ddc
N
480}
481
435d4ebb 482#ifndef MDASSEMBLE
682c7051
NB
483int check_ext2(int fd, char *name)
484{
485 /*
486 * Check for an ext2fs file system.
487 * Superblock is always 1K at 1K offset
488 *
489 * s_magic is le16 at 56 == 0xEF53
490 * report mtime - le32 at 44
491 * blocks - le32 at 4
492 * logblksize - le32 at 24
493 */
494 unsigned char sb[1024];
495 time_t mtime;
496 int size, bsize;
497 if (lseek(fd, 1024,0)!= 1024)
498 return 0;
499 if (read(fd, sb, 1024)!= 1024)
500 return 0;
501 if (sb[56] != 0x53 || sb[57] != 0xef)
502 return 0;
503
504 mtime = sb[44]|(sb[45]|(sb[46]|sb[47]<<8)<<8)<<8;
505 bsize = sb[24]|(sb[25]|(sb[26]|sb[27]<<8)<<8)<<8;
506 size = sb[4]|(sb[5]|(sb[6]|sb[7]<<8)<<8)<<8;
507 fprintf(stderr, Name ": %s appears to contain an ext2fs file system\n",
508 name);
509 fprintf(stderr," size=%dK mtime=%s",
510 size*(1<<bsize), ctime(&mtime));
511 return 1;
512}
513
514int check_reiser(int fd, char *name)
515{
516 /*
517 * superblock is at 64K
518 * size is 1024;
519 * Magic string "ReIsErFs" or "ReIsEr2Fs" at 52
520 *
521 */
522 unsigned char sb[1024];
881990a2 523 unsigned long size;
682c7051
NB
524 if (lseek(fd, 64*1024, 0) != 64*1024)
525 return 0;
526 if (read(fd, sb, 1024) != 1024)
527 return 0;
a46f4061
NB
528 if (strncmp((char*)sb+52, "ReIsErFs",8)!=0 &&
529 strncmp((char*)sb+52, "ReIsEr2Fs",9)!=0)
682c7051
NB
530 return 0;
531 fprintf(stderr, Name ": %s appears to contain a reiserfs file system\n",name);
532 size = sb[0]|(sb[1]|(sb[2]|sb[3]<<8)<<8)<<8;
881990a2 533 fprintf(stderr, " size = %luK\n", size*4);
aba69144 534
682c7051
NB
535 return 1;
536}
537
538int check_raid(int fd, char *name)
539{
4b1ac34b 540 struct mdinfo info;
682c7051 541 time_t crtime;
d078d77c 542 char *level;
82d9eba6 543 struct supertype *st = guess_super(fd);
f9ce90ba 544
82d9eba6 545 if (!st) return 0;
4a96d9ff 546 st->ignore_hw_compat = 1;
3da92f27 547 st->ss->load_super(st, fd, name);
82d9eba6
NB
548 /* Looks like a raid array .. */
549 fprintf(stderr, Name ": %s appears to be part of a raid array:\n",
550 name);
a5d85af7 551 st->ss->getinfo_super(st, &info, NULL);
3da92f27 552 st->ss->free_super(st);
82d9eba6 553 crtime = info.array.ctime;
d078d77c
NB
554 level = map_num(pers, info.array.level);
555 if (!level) level = "-unknown-";
556 fprintf(stderr, " level=%s devices=%d ctime=%s",
557 level, info.array.raid_disks, ctime(&crtime));
82d9eba6 558 return 1;
682c7051
NB
559}
560
682c7051
NB
561int ask(char *mesg)
562{
563 char *add = "";
564 int i;
565 for (i=0; i<5; i++) {
566 char buf[100];
567 fprintf(stderr, "%s%s", mesg, add);
568 fflush(stderr);
569 if (fgets(buf, 100, stdin)==NULL)
570 return 0;
571 if (buf[0]=='y' || buf[0]=='Y')
572 return 1;
573 if (buf[0]=='n' || buf[0]=='N')
574 return 0;
575 add = "(y/n) ";
576 }
577 fprintf(stderr, Name ": assuming 'no'\n");
578 return 0;
579}
435d4ebb 580#endif /* MDASSEMBLE */
682c7051 581
8d80900b 582int is_standard(char *dev, int *nump)
e5329c37
NB
583{
584 /* tests if dev is a "standard" md dev name.
585 * i.e if the last component is "/dNN" or "/mdNN",
aba69144 586 * where NN is a string of digits
598f0d58
NB
587 * Returns 1 if a partitionable standard,
588 * -1 if non-partitonable,
589 * 0 if not a standard name.
e5329c37 590 */
8d80900b
NB
591 char *d = strrchr(dev, '/');
592 int type=0;
593 int num;
594 if (!d)
e5329c37 595 return 0;
8d80900b
NB
596 if (strncmp(d, "/d",2)==0)
597 d += 2, type=1; /* /dev/md/dN{pM} */
598 else if (strncmp(d, "/md_d", 5)==0)
2b4ca8f0 599 d += 5, type=1; /* /dev/md_dN{pM} */
8d80900b
NB
600 else if (strncmp(d, "/md", 3)==0)
601 d += 3, type=-1; /* /dev/mdN */
602 else if (d-dev > 3 && strncmp(d-2, "md/", 3)==0)
5a6d1148 603 d += 1, type=-1; /* /dev/md/N */
e5329c37
NB
604 else
605 return 0;
8d80900b 606 if (!*d)
e5329c37 607 return 0;
8d80900b
NB
608 num = atoi(d);
609 while (isdigit(*d))
610 d++;
611 if (*d)
e5329c37 612 return 0;
8d80900b
NB
613 if (nump) *nump = num;
614
615 return type;
e5329c37
NB
616}
617
4b1ac34b 618unsigned long calc_csum(void *super, int bytes)
82b27616 619{
56eb10c0 620 unsigned long long newcsum = 0;
82b27616 621 int i;
4b1ac34b
NB
622 unsigned int csum;
623 unsigned int *superc = (unsigned int*) super;
82b27616 624
4b1ac34b 625 for(i=0; i<bytes/4; i++)
82b27616
NB
626 newcsum+= superc[i];
627 csum = (newcsum& 0xffffffff) + (newcsum>>32);
570c0542 628#ifdef __alpha__
aba69144 629/* The in-kernel checksum calculation is always 16bit on
570c0542
NB
630 * the alpha, though it is 32 bit on i386...
631 * I wonder what it is elsewhere... (it uses and API in
632 * a way that it shouldn't).
633 */
634 csum = (csum & 0xffff) + (csum >> 16);
635 csum = (csum & 0xffff) + (csum >> 16);
636#endif
82b27616
NB
637 return csum;
638}
cd29a5c8 639
435d4ebb 640#ifndef MDASSEMBLE
56eb10c0 641char *human_size(long long bytes)
cd29a5c8
NB
642{
643 static char buf[30];
d5d3721e
NB
644
645 /* We convert bytes to either centi-M{ega,ibi}bytes or
646 * centi-G{igi,ibi}bytes, with appropriate rounding,
647 * and then print 1/100th of those as a decimal.
648 * We allow upto 2048Megabytes before converting to
649 * gigabytes, as that shows more precision and isn't
650 * too large a number.
01619b48 651 * Terabytes are not yet handled.
d5d3721e 652 */
cd29a5c8 653
56eb10c0 654 if (bytes < 5000*1024)
cd29a5c8 655 buf[0]=0;
d5d3721e
NB
656 else if (bytes < 2*1024LL*1024LL*1024LL) {
657 long cMiB = (bytes / ( (1LL<<20) / 200LL ) +1) /2;
658 long cMB = (bytes / ( 1000000LL / 200LL ) +1) /2;
8f23b0b3 659 snprintf(buf, sizeof(buf), " (%ld.%02ld MiB %ld.%02ld MB)",
d5d3721e
NB
660 cMiB/100 , cMiB % 100,
661 cMB/100, cMB % 100);
662 } else {
663 long cGiB = (bytes / ( (1LL<<30) / 200LL ) +1) /2;
664 long cGB = (bytes / (1000000000LL/200LL ) +1) /2;
8f23b0b3 665 snprintf(buf, sizeof(buf), " (%ld.%02ld GiB %ld.%02ld GB)",
d5d3721e
NB
666 cGiB/100 , cGiB % 100,
667 cGB/100, cGB % 100);
668 }
cd29a5c8
NB
669 return buf;
670}
e0d19036
NB
671
672char *human_size_brief(long long bytes)
673{
674 static char buf[30];
e0d19036
NB
675
676 if (bytes < 5000*1024)
8f23b0b3 677 snprintf(buf, sizeof(buf), "%ld.%02ldKiB",
bd526cee 678 (long)(bytes>>10), (long)(((bytes&1023)*100+512)/1024)
e0d19036
NB
679 );
680 else if (bytes < 2*1024LL*1024LL*1024LL)
8f23b0b3 681 snprintf(buf, sizeof(buf), "%ld.%02ldMiB",
e0d19036 682 (long)(bytes>>20),
bd526cee 683 (long)((bytes&0xfffff)+0x100000/200)/(0x100000/100)
e0d19036
NB
684 );
685 else
8f23b0b3 686 snprintf(buf, sizeof(buf), "%ld.%02ldGiB",
e0d19036 687 (long)(bytes>>30),
bd526cee 688 (long)(((bytes>>10)&0xfffff)+0x100000/200)/(0x100000/100)
e0d19036
NB
689 );
690 return buf;
691}
e4965ef8
N
692
693void print_r10_layout(int layout)
694{
695 int near = layout & 255;
696 int far = (layout >> 8) & 255;
697 int offset = (layout&0x10000);
698 char *sep = "";
699
700 if (near != 1) {
701 printf("%s near=%d", sep, near);
702 sep = ",";
703 }
704 if (far != 1)
705 printf("%s %s=%d", sep, offset?"offset":"far", far);
706 if (near*far == 1)
707 printf("NO REDUNDANCY");
708}
435d4ebb 709#endif
e0d19036 710
5f8097be
NB
711unsigned long long calc_array_size(int level, int raid_disks, int layout,
712 int chunksize, unsigned long long devsize)
577e8448
AK
713{
714 devsize &= ~(unsigned long long)((chunksize>>9)-1);
715 return get_data_disks(level, layout, raid_disks) * devsize;
716}
717
718int get_data_disks(int level, int layout, int raid_disks)
5f8097be
NB
719{
720 int data_disks = 0;
721 switch (level) {
722 case 0: data_disks = raid_disks; break;
723 case 1: data_disks = 1; break;
724 case 4:
725 case 5: data_disks = raid_disks - 1; break;
726 case 6: data_disks = raid_disks - 2; break;
727 case 10: data_disks = raid_disks / (layout & 255) / ((layout>>8)&255);
728 break;
729 }
577e8448
AK
730
731 return data_disks;
5f8097be
NB
732}
733
0e600426 734#if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO)
e0d19036
NB
735char *get_md_name(int dev)
736{
737 /* find /dev/md%d or /dev/md/%d or make a device /dev/.tmp.md%d */
98c6faba 738 /* if dev < 0, want /dev/md/d%d or find mdp in /proc/devices ... */
e0d19036
NB
739 static char devname[50];
740 struct stat stb;
98c6faba 741 dev_t rdev;
dd0781e5 742 char *dn;
98c6faba
NB
743
744 if (dev < 0) {
dd0781e5
NB
745 int mdp = get_mdp_major();
746 if (mdp < 0) return NULL;
0df46c2a 747 rdev = makedev(mdp, (-1-dev)<<6);
8f23b0b3 748 snprintf(devname, sizeof(devname), "/dev/md/d%d", -1-dev);
98c6faba
NB
749 if (stat(devname, &stb) == 0
750 && (S_IFMT&stb.st_mode) == S_IFBLK
751 && (stb.st_rdev == rdev))
752 return devname;
753 } else {
0df46c2a 754 rdev = makedev(MD_MAJOR, dev);
8f23b0b3 755 snprintf(devname, sizeof(devname), "/dev/md%d", dev);
98c6faba
NB
756 if (stat(devname, &stb) == 0
757 && (S_IFMT&stb.st_mode) == S_IFBLK
758 && (stb.st_rdev == rdev))
759 return devname;
760
8f23b0b3 761 snprintf(devname, sizeof(devname), "/dev/md/%d", dev);
98c6faba
NB
762 if (stat(devname, &stb) == 0
763 && (S_IFMT&stb.st_mode) == S_IFBLK
764 && (stb.st_rdev == rdev))
765 return devname;
766 }
16c6fa80 767 dn = map_dev(major(rdev), minor(rdev), 0);
dd0781e5
NB
768 if (dn)
769 return dn;
8f23b0b3 770 snprintf(devname, sizeof(devname), "/dev/.tmp.md%d", dev);
e0d19036 771 if (mknod(devname, S_IFBLK | 0600, rdev) == -1)
dd0781e5
NB
772 if (errno != EEXIST)
773 return NULL;
e0d19036
NB
774
775 if (stat(devname, &stb) == 0
776 && (S_IFMT&stb.st_mode) == S_IFBLK
777 && (stb.st_rdev == rdev))
778 return devname;
779 unlink(devname);
780 return NULL;
781}
782
783void put_md_name(char *name)
784{
785 if (strncmp(name, "/dev/.tmp.md", 12)==0)
786 unlink(name);
787}
ea24acd0 788
ea24acd0
NB
789int find_free_devnum(int use_partitions)
790{
791 int devnum;
792 for (devnum = 127; devnum != 128;
a56fb7ec 793 devnum = devnum ? devnum-1 : (1<<20)-1) {
ea24acd0
NB
794 char *dn;
795 int _devnum;
796
797 _devnum = use_partitions ? (-1-devnum) : devnum;
798 if (mddev_busy(_devnum))
799 continue;
800 /* make sure it is new to /dev too, at least as a
801 * non-standard */
802 dn = map_dev(dev2major(_devnum), dev2minor(_devnum), 0);
803 if (dn && ! is_standard(dn, NULL))
804 continue;
805 break;
806 }
807 if (devnum == 128)
808 return NoMdDev;
809 return use_partitions ? (-1-devnum) : devnum;
810}
435d4ebb 811#endif /* !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) */
f9ce90ba 812
8b0dabea
NB
813int dev_open(char *dev, int flags)
814{
815 /* like 'open', but if 'dev' matches %d:%d, create a temp
816 * block device and open that
817 */
818 char *e;
819 int fd = -1;
820 char devname[32];
e81cdd9f 821 int major;
8b0dabea 822 int minor;
e81cdd9f
NB
823
824 if (!dev) return -1;
6df6a774 825 flags |= O_DIRECT;
e81cdd9f
NB
826
827 major = strtoul(dev, &e, 0);
8b0dabea
NB
828 if (e > dev && *e == ':' && e[1] &&
829 (minor = strtoul(e+1, &e, 0)) >= 0 &&
830 *e == 0) {
6df6a774
N
831 char *path = map_dev(major, minor, 0);
832 if (path)
833 fd = open(path, flags);
834 if (fd < 0) {
835 snprintf(devname, sizeof(devname), "/dev/.tmp.md.%d:%d:%d",
836 (int)getpid(), major, minor);
837 if (mknod(devname, S_IFBLK|0600, makedev(major, minor))==0) {
838 fd = open(devname, flags);
839 unlink(devname);
840 }
841 }
842 if (fd < 0) {
843 snprintf(devname, sizeof(devname), "/tmp/.tmp.md.%d:%d:%d",
844 (int)getpid(), major, minor);
845 if (mknod(devname, S_IFBLK|0600, makedev(major, minor))==0) {
846 fd = open(devname, flags);
847 unlink(devname);
848 }
8b0dabea
NB
849 }
850 } else
6df6a774 851 fd = open(dev, flags);
8b0dabea
NB
852 return fd;
853}
f9ce90ba 854
d998b738 855int open_dev_flags(int devnum, int flags)
e8a70c89
N
856{
857 char buf[20];
858
859 sprintf(buf, "%d:%d", dev2major(devnum), dev2minor(devnum));
d998b738
N
860 return dev_open(buf, flags);
861}
862
863int open_dev(int devnum)
864{
865 return open_dev_flags(devnum, O_RDONLY);
e8a70c89
N
866}
867
a931db9e
NB
868int open_dev_excl(int devnum)
869{
870 char buf[20];
871 int i;
7187750e 872 int flags = O_RDWR;
a931db9e
NB
873
874 sprintf(buf, "%d:%d", dev2major(devnum), dev2minor(devnum));
875 for (i=0 ; i<25 ; i++) {
7187750e 876 int fd = dev_open(buf, flags|O_EXCL);
a931db9e
NB
877 if (fd >= 0)
878 return fd;
7187750e
N
879 if (errno == EACCES && flags == O_RDWR) {
880 flags = O_RDONLY;
881 continue;
882 }
a931db9e
NB
883 if (errno != EBUSY)
884 return fd;
885 usleep(200000);
886 }
887 return -1;
888}
889
9008ed1c
N
890int same_dev(char *one, char *two)
891{
892 struct stat st1, st2;
893 if (stat(one, &st1) != 0)
894 return 0;
895 if (stat(two, &st2) != 0)
896 return 0;
897 if ((st1.st_mode & S_IFMT) != S_IFBLK)
898 return 0;
899 if ((st2.st_mode & S_IFMT) != S_IFBLK)
900 return 0;
901 return st1.st_rdev == st2.st_rdev;
902}
903
a7c6e3fb 904void wait_for(char *dev, int fd)
a714580e
N
905{
906 int i;
a7c6e3fb
N
907 struct stat stb_want;
908
909 if (fstat(fd, &stb_want) != 0 ||
910 (stb_want.st_mode & S_IFMT) != S_IFBLK)
911 return;
a714580e
N
912
913 for (i=0 ; i<25 ; i++) {
914 struct stat stb;
a7c6e3fb
N
915 if (stat(dev, &stb) == 0 &&
916 (stb.st_mode & S_IFMT) == S_IFBLK &&
917 (stb.st_rdev == stb_want.st_rdev))
a714580e
N
918 return;
919 usleep(200000);
920 }
436305c6
DW
921 if (i == 25)
922 dprintf("%s: timeout waiting for %s\n", __func__, dev);
a714580e
N
923}
924
0f22b998
N
925struct superswitch *superlist[] =
926{
927 &super0, &super1,
928 &super_ddf, &super_imsm,
0592faeb 929 &mbr, &gpt,
0f22b998 930 NULL };
f9ce90ba 931
ea24acd0 932#if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO)
f7dd881f 933
4725bc31 934struct supertype *super_by_fd(int fd, char **subarrayp)
f9ce90ba 935{
1686dc25
NB
936 mdu_array_info_t array;
937 int vers;
938 int minor;
939 struct supertype *st = NULL;
7e0f6979 940 struct mdinfo *sra;
142cb9e1 941 char *verstr;
1686dc25
NB
942 char version[20];
943 int i;
f7e7067b 944 char *subarray = NULL;
5f7e44b2 945 int container = NoMdDev;
1686dc25
NB
946
947 sra = sysfs_read(fd, 0, GET_VERSION);
948
949 if (sra) {
7e0f6979
NB
950 vers = sra->array.major_version;
951 minor = sra->array.minor_version;
142cb9e1 952 verstr = sra->text_version;
1686dc25
NB
953 } else {
954 if (ioctl(fd, GET_ARRAY_INFO, &array))
955 array.major_version = array.minor_version = 0;
956 vers = array.major_version;
957 minor = array.minor_version;
142cb9e1 958 verstr = "";
6fbba4c9 959 }
82d9eba6 960
1686dc25
NB
961 if (vers != -1) {
962 sprintf(version, "%d.%d", vers, minor);
963 verstr = version;
6fbba4c9 964 }
3c558363 965 if (minor == -2 && is_subarray(verstr)) {
f7e7067b 966 char *dev = verstr+1;
5f7e44b2 967
f7e7067b 968 subarray = strchr(dev, '/');
f7e7067b
NB
969 if (subarray)
970 *subarray++ = '\0';
f7e7067b 971 subarray = strdup(subarray);
5f7e44b2 972 container = devname2devnum(dev);
f7e7067b
NB
973 if (sra)
974 sysfs_free(sra);
5f7e44b2 975 sra = sysfs_read(-1, container, GET_VERSION);
603f24a0
N
976 if (sra && sra->text_version[0])
977 verstr = sra->text_version;
978 else
979 verstr = "-no-metadata-";
f7e7067b
NB
980 }
981
982 for (i = 0; st == NULL && superlist[i] ; i++)
983 st = superlist[i]->match_metadata_desc(verstr);
1686dc25
NB
984
985 if (sra)
986 sysfs_free(sra);
f7e7067b 987 if (st) {
3b0896f8 988 st->sb = NULL;
1f49fb3a
N
989 if (subarrayp)
990 *subarrayp = subarray;
5f7e44b2
DW
991 st->container_dev = container;
992 st->devnum = fd2devnum(fd);
4725bc31
N
993 } else
994 free(subarray);
5f7e44b2 995
82d9eba6 996 return st;
f9ce90ba 997}
ea24acd0
NB
998#endif /* !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) */
999
0f0749ad 1000int dev_size_from_id(dev_t id, unsigned long long *size)
52d5d101
AC
1001{
1002 char buf[20];
1003 int fd;
1004
1005 sprintf(buf, "%d:%d", major(id), minor(id));
1006 fd = dev_open(buf, O_RDONLY);
1007 if (fd < 0)
1008 return 0;
1009 if (get_dev_size(fd, NULL, size)) {
1010 close(fd);
1011 return 1;
1012 }
1013 close(fd);
1014 return 0;
1015}
f9ce90ba 1016
159c3a1a 1017struct supertype *dup_super(struct supertype *orig)
3da92f27 1018{
159c3a1a 1019 struct supertype *st;
1686dc25 1020
d2ca6449
NB
1021 if (!orig)
1022 return orig;
159c3a1a 1023 st = malloc(sizeof(*st));
3da92f27
NB
1024 if (!st)
1025 return st;
ef609477 1026 memset(st, 0, sizeof(*st));
159c3a1a
NB
1027 st->ss = orig->ss;
1028 st->max_devs = orig->max_devs;
1029 st->minor_version = orig->minor_version;
1030 st->sb = NULL;
1031 st->info = NULL;
1032 return st;
3da92f27
NB
1033}
1034
54887ad8 1035struct supertype *guess_super_type(int fd, enum guess_types guess_type)
f9ce90ba
NB
1036{
1037 /* try each load_super to find the best match,
1038 * and return the best superswitch
1039 */
82d9eba6
NB
1040 struct superswitch *ss;
1041 struct supertype *st;
f21e18ca 1042 time_t besttime = 0;
570c0542 1043 int bestsuper = -1;
f9ce90ba
NB
1044 int i;
1045
82d9eba6 1046 st = malloc(sizeof(*st));
d1d599ea
N
1047 memset(st, 0, sizeof(*st));
1048 st->container_dev = NoMdDev;
1049
f9ce90ba
NB
1050 for (i=0 ; superlist[i]; i++) {
1051 int rv;
1052 ss = superlist[i];
54887ad8
N
1053 if (guess_type == guess_array && ss->add_to_super == NULL)
1054 continue;
1055 if (guess_type == guess_partitions && ss->add_to_super != NULL)
1056 continue;
ef609477 1057 memset(st, 0, sizeof(*st));
df3346e6 1058 st->ignore_hw_compat = 1;
3da92f27 1059 rv = ss->load_super(st, fd, NULL);
570c0542
NB
1060 if (rv == 0) {
1061 struct mdinfo info;
a5d85af7 1062 st->ss->getinfo_super(st, &info, NULL);
570c0542
NB
1063 if (bestsuper == -1 ||
1064 besttime < info.array.ctime) {
1065 bestsuper = i;
1066 besttime = info.array.ctime;
570c0542 1067 }
3da92f27 1068 ss->free_super(st);
570c0542
NB
1069 }
1070 }
1071 if (bestsuper != -1) {
1072 int rv;
ef609477 1073 memset(st, 0, sizeof(*st));
df3346e6 1074 st->ignore_hw_compat = 1;
3da92f27 1075 rv = superlist[bestsuper]->load_super(st, fd, NULL);
f9ce90ba 1076 if (rv == 0) {
5e747af2 1077 superlist[bestsuper]->free_super(st);
df3346e6 1078 st->ignore_hw_compat = 0;
82d9eba6 1079 return st;
f9ce90ba
NB
1080 }
1081 }
570c0542 1082 free(st);
f9ce90ba
NB
1083 return NULL;
1084}
fe6729fa 1085
beae1dfe
NB
1086/* Return size of device in bytes */
1087int get_dev_size(int fd, char *dname, unsigned long long *sizep)
1088{
1089 unsigned long long ldsize;
c2c9bb6f
NB
1090 struct stat st;
1091
1092 if (fstat(fd, &st) != -1 && S_ISREG(st.st_mode))
1093 ldsize = (unsigned long long)st.st_size;
1094 else
beae1dfe
NB
1095#ifdef BLKGETSIZE64
1096 if (ioctl(fd, BLKGETSIZE64, &ldsize) != 0)
1097#endif
1098 {
1099 unsigned long dsize;
1100 if (ioctl(fd, BLKGETSIZE, &dsize) == 0) {
1101 ldsize = dsize;
1102 ldsize <<= 9;
1103 } else {
1104 if (dname)
1105 fprintf(stderr, Name ": Cannot get size of %s: %s\b",
1106 dname, strerror(errno));
1107 return 0;
1108 }
1109 }
1110 *sizep = ldsize;
1111 return 1;
1112}
8fac0577 1113
3a371610
N
1114/* Return true if this can only be a container, not a member device.
1115 * i.e. is and md device and size is zero
1116 */
1117int must_be_container(int fd)
1118{
1119 unsigned long long size;
1120 if (md_get_version(fd) < 0)
1121 return 0;
1122 if (get_dev_size(fd, NULL, &size) == 0)
1123 return 1;
1124 if (size == 0)
1125 return 1;
1126 return 0;
1127}
034b203a
TM
1128
1129/* Sets endofpart parameter to the last block used by the last GPT partition on the device.
1130 * Returns: 1 if successful
1131 * -1 for unknown partition type
1132 * 0 for other errors
1133 */
1134static int get_gpt_last_partition_end(int fd, unsigned long long *endofpart)
1135{
056b331e 1136 struct GPT gpt;
034b203a 1137 unsigned char empty_gpt_entry[16]= {0};
db7fdfe4
JS
1138 struct GPT_part_entry *part;
1139 char buf[512];
034b203a
TM
1140 unsigned long long curr_part_end;
1141 unsigned all_partitions, entry_size;
f21e18ca 1142 unsigned part_nr;
034b203a
TM
1143
1144 *endofpart = 0;
1145
056b331e 1146 BUILD_BUG_ON(sizeof(gpt) != 512);
73e658d8 1147 /* skip protective MBR */
034b203a 1148 lseek(fd, 512, SEEK_SET);
73e658d8 1149 /* read GPT header */
056b331e 1150 if (read(fd, &gpt, 512) != 512)
034b203a
TM
1151 return 0;
1152
1153 /* get the number of partition entries and the entry size */
056b331e
N
1154 all_partitions = __le32_to_cpu(gpt.part_cnt);
1155 entry_size = __le32_to_cpu(gpt.part_size);
034b203a
TM
1156
1157 /* Check GPT signature*/
056b331e 1158 if (gpt.magic != GPT_SIGNATURE_MAGIC)
034b203a
TM
1159 return -1;
1160
1161 /* sanity checks */
1162 if (all_partitions > 1024 ||
db7fdfe4 1163 entry_size > sizeof(buf))
034b203a
TM
1164 return -1;
1165
db7fdfe4
JS
1166 part = (struct GPT_part_entry *)buf;
1167
034b203a 1168 for (part_nr=0; part_nr < all_partitions; part_nr++) {
73e658d8 1169 /* read partition entry */
db7fdfe4 1170 if (read(fd, buf, entry_size) != (ssize_t)entry_size)
73e658d8
LB
1171 return 0;
1172
034b203a 1173 /* is this valid partition? */
db7fdfe4 1174 if (memcmp(part->type_guid, empty_gpt_entry, 16) != 0) {
034b203a 1175 /* check the last lba for the current partition */
db7fdfe4 1176 curr_part_end = __le64_to_cpu(part->ending_lba);
034b203a
TM
1177 if (curr_part_end > *endofpart)
1178 *endofpart = curr_part_end;
1179 }
1180
034b203a
TM
1181 }
1182 return 1;
1183}
1184
1185/* Sets endofpart parameter to the last block used by the last partition on the device.
1186 * Returns: 1 if successful
1187 * -1 for unknown partition type
1188 * 0 for other errors
1189 */
1190static int get_last_partition_end(int fd, unsigned long long *endofpart)
1191{
056b331e 1192 struct MBR boot_sect;
034b203a
TM
1193 struct MBR_part_record *part;
1194 unsigned long long curr_part_end;
f21e18ca 1195 unsigned part_nr;
034b203a
TM
1196 int retval = 0;
1197
1198 *endofpart = 0;
1199
056b331e 1200 BUILD_BUG_ON(sizeof(boot_sect) != 512);
034b203a
TM
1201 /* read MBR */
1202 lseek(fd, 0, 0);
056b331e 1203 if (read(fd, &boot_sect, 512) != 512)
034b203a
TM
1204 goto abort;
1205
1206 /* check MBP signature */
056b331e 1207 if (boot_sect.magic == MBR_SIGNATURE_MAGIC) {
034b203a
TM
1208 retval = 1;
1209 /* found the correct signature */
056b331e 1210 part = boot_sect.parts;
034b203a
TM
1211
1212 for (part_nr=0; part_nr < MBR_PARTITIONS; part_nr++) {
1213 /* check for GPT type */
1214 if (part->part_type == MBR_GPT_PARTITION_TYPE) {
1215 retval = get_gpt_last_partition_end(fd, endofpart);
1216 break;
1217 }
1218 /* check the last used lba for the current partition */
1219 curr_part_end = __le32_to_cpu(part->first_sect_lba) +
1220 __le32_to_cpu(part->blocks_num);
1221 if (curr_part_end > *endofpart)
1222 *endofpart = curr_part_end;
1223
1224 part++;
1225 }
1226 } else {
1227 /* Unknown partition table */
1228 retval = -1;
1229 }
1230 abort:
1231 return retval;
1232}
1233
53ed6ac3
KW
1234int check_partitions(int fd, char *dname, unsigned long long freesize,
1235 unsigned long long size)
034b203a
TM
1236{
1237 /*
1238 * Check where the last partition ends
1239 */
1240 unsigned long long endofpart;
1241 int ret;
1242
1243 if ((ret = get_last_partition_end(fd, &endofpart)) > 0) {
1244 /* There appears to be a partition table here */
1245 if (freesize == 0) {
1246 /* partitions will not be visible in new device */
1247 fprintf(stderr,
1248 Name ": partition table exists on %s but will be lost or\n"
1249 " meaningless after creating array\n",
1250 dname);
1251 return 1;
1252 } else if (endofpart > freesize) {
1253 /* last partition overlaps metadata */
1254 fprintf(stderr,
1255 Name ": metadata will over-write last partition on %s.\n",
1256 dname);
1257 return 1;
53ed6ac3
KW
1258 } else if (size && endofpart > size) {
1259 /* partitions will be truncated in new device */
1260 fprintf(stderr,
1261 Name ": array size is too small to cover all partitions on %s.\n",
1262 dname);
1263 return 1;
034b203a
TM
1264 }
1265 }
1266 return 0;
1267}
1268
8382f19b
NB
1269void get_one_disk(int mdfd, mdu_array_info_t *ainf, mdu_disk_info_t *disk)
1270{
1271 int d;
9e6d9291 1272
8382f19b 1273 ioctl(mdfd, GET_ARRAY_INFO, ainf);
9e6d9291
N
1274 for (d = 0 ; d < 1024 ; d++) {
1275 if (ioctl(mdfd, GET_DISK_INFO, disk) == 0 &&
1276 (disk->major || disk->minor))
8382f19b 1277 return;
9e6d9291 1278 }
8382f19b 1279}
63152c1b 1280
a322f70c
DW
1281int open_container(int fd)
1282{
1283 /* 'fd' is a block device. Find out if it is in use
1284 * by a container, and return an open fd on that container.
1285 */
1286 char path[256];
1287 char *e;
1288 DIR *dir;
1289 struct dirent *de;
1290 int dfd, n;
1291 char buf[200];
1292 int major, minor;
1293 struct stat st;
1294
1295 if (fstat(fd, &st) != 0)
1296 return -1;
1297 sprintf(path, "/sys/dev/block/%d:%d/holders",
1298 (int)major(st.st_rdev), (int)minor(st.st_rdev));
1299 e = path + strlen(path);
1300
1301 dir = opendir(path);
1302 if (!dir)
1303 return -1;
1304 while ((de = readdir(dir))) {
1305 if (de->d_ino == 0)
1306 continue;
1307 if (de->d_name[0] == '.')
1308 continue;
1309 sprintf(e, "/%s/dev", de->d_name);
1310 dfd = open(path, O_RDONLY);
1311 if (dfd < 0)
1312 continue;
1313 n = read(dfd, buf, sizeof(buf));
1314 close(dfd);
f21e18ca 1315 if (n <= 0 || (unsigned)n >= sizeof(buf))
a322f70c
DW
1316 continue;
1317 buf[n] = 0;
1318 if (sscanf(buf, "%d:%d", &major, &minor) != 2)
1319 continue;
1320 sprintf(buf, "%d:%d", major, minor);
1321 dfd = dev_open(buf, O_RDONLY);
1322 if (dfd >= 0) {
1323 closedir(dir);
1324 return dfd;
1325 }
1326 }
355726fa 1327 closedir(dir);
a322f70c
DW
1328 return -1;
1329}
1330
33414a01
DW
1331struct superswitch *version_to_superswitch(char *vers)
1332{
1333 int i;
1334
1335 for (i = 0; superlist[i]; i++) {
1336 struct superswitch *ss = superlist[i];
1337
1338 if (strcmp(vers, ss->name) == 0)
1339 return ss;
1340 }
1341
1342 return NULL;
1343}
1344
1345int is_container_member(struct mdstat_ent *mdstat, char *container)
1346{
1347 if (mdstat->metadata_version == NULL ||
1348 strncmp(mdstat->metadata_version, "external:", 9) != 0 ||
1349 !is_subarray(mdstat->metadata_version+9) ||
1350 strncmp(mdstat->metadata_version+10, container, strlen(container)) != 0 ||
1351 mdstat->metadata_version[10+strlen(container)] != '/')
1352 return 0;
1353
1354 return 1;
1355}
1356
1357int is_subarray_active(char *subarray, char *container)
1358{
1359 struct mdstat_ent *mdstat = mdstat_read(0, 0);
1360 struct mdstat_ent *ent;
1361
e5408a32
DW
1362 for (ent = mdstat; ent; ent = ent->next)
1363 if (is_container_member(ent, container))
e5e5d7ce 1364 if (strcmp(to_subarray(ent, container), subarray) == 0)
33414a01 1365 break;
33414a01
DW
1366
1367 free_mdstat(mdstat);
1368
1369 return ent != NULL;
1370}
1371
1372/* open_subarray - opens a subarray in a container
1373 * @dev: container device name
feab51f8 1374 * @st: empty supertype
33414a01
DW
1375 * @quiet: block reporting errors flag
1376 *
1377 * On success returns an fd to a container and fills in *st
1378 */
feab51f8 1379int open_subarray(char *dev, char *subarray, struct supertype *st, int quiet)
33414a01
DW
1380{
1381 struct mdinfo *mdi;
a951a4f7 1382 struct mdinfo *info;
33414a01
DW
1383 int fd, err = 1;
1384
1385 fd = open(dev, O_RDWR|O_EXCL);
1386 if (fd < 0) {
1387 if (!quiet)
1388 fprintf(stderr, Name ": Couldn't open %s, aborting\n",
1389 dev);
b990032d 1390 return -1;
33414a01
DW
1391 }
1392
1393 st->devnum = fd2devnum(fd);
1394 if (st->devnum == NoMdDev) {
1395 if (!quiet)
1396 fprintf(stderr,
1397 Name ": Failed to determine device number for %s\n",
1398 dev);
1399 goto close_fd;
1400 }
1401
1402 mdi = sysfs_read(fd, st->devnum, GET_VERSION|GET_LEVEL);
1403 if (!mdi) {
1404 if (!quiet)
1405 fprintf(stderr, Name ": Failed to read sysfs for %s\n",
1406 dev);
1407 goto close_fd;
1408 }
1409
1410 if (mdi->array.level != UnSet) {
1411 if (!quiet)
1412 fprintf(stderr, Name ": %s is not a container\n", dev);
1413 goto free_sysfs;
1414 }
1415
1416 st->ss = version_to_superswitch(mdi->text_version);
1417 if (!st->ss) {
1418 if (!quiet)
1419 fprintf(stderr,
1420 Name ": Operation not supported for %s metadata\n",
1421 mdi->text_version);
1422 goto free_sysfs;
1423 }
1424
1425 st->devname = devnum2devname(st->devnum);
1426 if (!st->devname) {
1427 if (!quiet)
1428 fprintf(stderr, Name ": Failed to allocate device name\n");
1429 goto free_sysfs;
1430 }
1431
db20d413 1432 if (!st->ss->load_container) {
33414a01 1433 if (!quiet)
db20d413 1434 fprintf(stderr, Name ": %s is not a container\n", dev);
33414a01
DW
1435 goto free_name;
1436 }
1437
db20d413 1438 if (st->ss->load_container(st, fd, NULL)) {
33414a01 1439 if (!quiet)
db20d413
N
1440 fprintf(stderr, Name ": Failed to load metadata for %s\n",
1441 dev);
1442 goto free_name;
33414a01
DW
1443 }
1444
a951a4f7
N
1445 info = st->ss->container_content(st, subarray);
1446 if (!info) {
1447 if (!quiet)
1448 fprintf(stderr, Name ": Failed to find subarray-%s in %s\n",
1449 subarray, dev);
1450 goto free_super;
1451 }
1452 free(info);
1453
33414a01
DW
1454 err = 0;
1455
1456 free_super:
1457 if (err)
1458 st->ss->free_super(st);
1459 free_name:
1460 if (err)
1461 free(st->devname);
1462 free_sysfs:
1463 sysfs_free(mdi);
1464 close_fd:
1465 if (err)
1466 close(fd);
1467
1468 if (err)
1469 return -1;
1470 else
1471 return fd;
1472}
1473
7801ac20
N
1474int add_disk(int mdfd, struct supertype *st,
1475 struct mdinfo *sra, struct mdinfo *info)
1476{
1477 /* Add a device to an array, in one of 2 ways. */
1478 int rv;
1479#ifndef MDASSEMBLE
1480 if (st->ss->external) {
d23534e4
DW
1481 if (info->disk.state & (1<<MD_DISK_SYNC))
1482 info->recovery_start = MaxSector;
1483 else
1484 info->recovery_start = 0;
2904b26f 1485 rv = sysfs_add_disk(sra, info, 0);
7801ac20
N
1486 if (! rv) {
1487 struct mdinfo *sd2;
f35f2525
N
1488 for (sd2 = sra->devs; sd2; sd2=sd2->next)
1489 if (sd2 == info)
1490 break;
1491 if (sd2 == NULL) {
1492 sd2 = malloc(sizeof(*sd2));
1493 *sd2 = *info;
1494 sd2->next = sra->devs;
1495 sra->devs = sd2;
1496 }
7801ac20
N
1497 }
1498 } else
1499#endif
1500 rv = ioctl(mdfd, ADD_NEW_DISK, &info->disk);
1501 return rv;
1502}
1503
de6ae750
N
1504int remove_disk(int mdfd, struct supertype *st,
1505 struct mdinfo *sra, struct mdinfo *info)
1506{
1507 int rv;
1508 /* Remove the disk given by 'info' from the array */
1509#ifndef MDASSEMBLE
1510 if (st->ss->external)
1511 rv = sysfs_set_str(sra, info, "slot", "none");
1512 else
1513#endif
1514 rv = ioctl(mdfd, HOT_REMOVE_DISK, makedev(info->disk.major,
1515 info->disk.minor));
1516 return rv;
1517}
1518
f35f2525
N
1519int set_array_info(int mdfd, struct supertype *st, struct mdinfo *info)
1520{
1521 /* Initialise kernel's knowledge of array.
1522 * This varies between externally managed arrays
1523 * and older kernels
1524 */
1525 int vers = md_get_version(mdfd);
1526 int rv;
1527
1528#ifndef MDASSEMBLE
1529 if (st->ss->external)
1530 rv = sysfs_set_array(info, vers);
1531 else
1532#endif
1533 if ((vers % 100) >= 1) { /* can use different versions */
1534 mdu_array_info_t inf;
1535 memset(&inf, 0, sizeof(inf));
1536 inf.major_version = info->array.major_version;
1537 inf.minor_version = info->array.minor_version;
1538 rv = ioctl(mdfd, SET_ARRAY_INFO, &inf);
1539 } else
1540 rv = ioctl(mdfd, SET_ARRAY_INFO, NULL);
1541 return rv;
1542}
1543
1e5c6983
DW
1544unsigned long long min_recovery_start(struct mdinfo *array)
1545{
1546 /* find the minimum recovery_start in an array for metadata
1547 * formats that only record per-array recovery progress instead
1548 * of per-device
1549 */
1550 unsigned long long recovery_start = MaxSector;
1551 struct mdinfo *d;
1552
1553 for (d = array->devs; d; d = d->next)
1554 recovery_start = min(recovery_start, d->recovery_start);
1555
1556 return recovery_start;
1557}
1558
24f6f99b 1559int mdmon_pid(int devnum)
a931db9e
NB
1560{
1561 char path[100];
1562 char pid[10];
1563 int fd;
1564 int n;
10013317
PHC
1565 char *devname = devnum2devname(devnum);
1566
753cf905 1567 sprintf(path, "%s/%s.pid", MDMON_DIR, devname);
10013317
PHC
1568 free(devname);
1569
24f6f99b 1570 fd = open(path, O_RDONLY | O_NOATIME, 0);
a931db9e
NB
1571
1572 if (fd < 0)
cf556303 1573 return -1;
a931db9e
NB
1574 n = read(fd, pid, 9);
1575 close(fd);
1576 if (n <= 0)
cf556303 1577 return -1;
24f6f99b 1578 return atoi(pid);
a931db9e
NB
1579}
1580
24f6f99b 1581int mdmon_running(int devnum)
a931db9e 1582{
24f6f99b
N
1583 int pid = mdmon_pid(devnum);
1584 if (pid <= 0)
a931db9e 1585 return 0;
24f6f99b 1586 if (kill(pid, 0) == 0)
a931db9e
NB
1587 return 1;
1588 return 0;
1589}
1590
8850ee3e
N
1591int start_mdmon(int devnum)
1592{
1913c325 1593 int i, skipped;
44d2e365 1594 int len;
9fe32043
N
1595 pid_t pid;
1596 int status;
44d2e365
N
1597 char pathbuf[1024];
1598 char *paths[4] = {
1599 pathbuf,
1600 "/sbin/mdmon",
1601 "mdmon",
1602 NULL
1603 };
8850ee3e 1604
40ebbb9c 1605 if (check_env("MDADM_NO_MDMON"))
8850ee3e
N
1606 return 0;
1607
9cf014ec 1608 len = readlink("/proc/self/exe", pathbuf, sizeof(pathbuf)-1);
44d2e365
N
1609 if (len > 0) {
1610 char *sl;
1611 pathbuf[len] = 0;
1612 sl = strrchr(pathbuf, '/');
1613 if (sl)
1614 sl++;
1615 else
1616 sl = pathbuf;
1617 strcpy(sl, "mdmon");
1618 } else
1619 pathbuf[0] = '\0';
1620
8850ee3e
N
1621 switch(fork()) {
1622 case 0:
1623 /* FIXME yuk. CLOSE_EXEC?? */
1913c325
N
1624 skipped = 0;
1625 for (i=3; skipped < 20; i++)
1626 if (close(i) < 0)
1627 skipped++;
1628 else
1629 skipped = 0;
1630
44d2e365 1631 for (i=0; paths[i]; i++)
a0963a86
JS
1632 if (paths[i][0]) {
1633 if (__offroot) {
1634 execl(paths[i], "mdmon", "--offroot",
1635 devnum2devname(devnum),
1636 NULL);
1637 } else {
1638 execl(paths[i], "mdmon",
1639 devnum2devname(devnum),
1640 NULL);
1641 }
1642 }
8850ee3e
N
1643 exit(1);
1644 case -1: fprintf(stderr, Name ": cannot run mdmon. "
1645 "Array remains readonly\n");
1646 return -1;
9fe32043
N
1647 default: /* parent - good */
1648 pid = wait(&status);
1649 if (pid < 0 || status != 0)
1650 return -1;
8850ee3e
N
1651 }
1652 return 0;
1653}
1654
40ebbb9c 1655int check_env(char *name)
5dcfcb71 1656{
40ebbb9c 1657 char *val = getenv(name);
5dcfcb71
DW
1658
1659 if (val && atoi(val) == 1)
1660 return 1;
1661
1662 return 0;
1663}
1664
148acb7b
DW
1665__u32 random32(void)
1666{
1667 __u32 rv;
1668 int rfd = open("/dev/urandom", O_RDONLY);
1669 if (rfd < 0 || read(rfd, &rv, 4) != 4)
1670 rv = random();
1671 if (rfd >= 0)
1672 close(rfd);
1673 return rv;
1674}
1675
0e600426 1676#ifndef MDASSEMBLE
edd8d13c
NB
1677int flush_metadata_updates(struct supertype *st)
1678{
1679 int sfd;
1680 if (!st->updates) {
1681 st->update_tail = NULL;
1682 return -1;
1683 }
1684
1685 sfd = connect_monitor(devnum2devname(st->container_dev));
1686 if (sfd < 0)
1687 return -1;
1688
1689 while (st->updates) {
1690 struct metadata_update *mu = st->updates;
1691 st->updates = mu->next;
1692
1693 send_message(sfd, mu, 0);
1694 wait_reply(sfd, 0);
1695 free(mu->buf);
1696 free(mu);
1697 }
1698 ack(sfd, 0);
1699 wait_reply(sfd, 0);
1700 close(sfd);
1701 st->update_tail = NULL;
1702 return 0;
1703}
1704
1705void append_metadata_update(struct supertype *st, void *buf, int len)
1706{
1707
1708 struct metadata_update *mu = malloc(sizeof(*mu));
1709
1710 mu->buf = buf;
1711 mu->len = len;
1712 mu->space = NULL;
cb23f1f4 1713 mu->space_list = NULL;
edd8d13c
NB
1714 mu->next = NULL;
1715 *st->update_tail = mu;
1716 st->update_tail = &mu->next;
1717}
0e600426 1718#endif /* MDASSEMBLE */
a931db9e 1719
fe6729fa
NB
1720#ifdef __TINYC__
1721/* tinyc doesn't optimize this check in ioctl.h out ... */
1722unsigned int __invalid_size_argument_for_IOC = 0;
1723#endif
1724
6d11ec6f
AK
1725int experimental(void)
1726{
1727 if (check_env("MDADM_EXPERIMENTAL"))
1728 return 1;
1729 else {
65c83a80
LD
1730 fprintf(stderr, Name ": To use this feature MDADM_EXPERIMENTAL"
1731 " environment variable has to be defined.\n");
6d11ec6f
AK
1732 return 0;
1733 }
1734}
1735
326727d9
AC
1736/* Pick all spares matching given criteria from a container
1737 * if min_size == 0 do not check size
1738 * if domlist == NULL do not check domains
1739 * if spare_group given add it to domains of each spare
1740 * metadata allows to test domains using metadata of destination array */
1741struct mdinfo *container_choose_spares(struct supertype *st,
1742 unsigned long long min_size,
1743 struct domainlist *domlist,
1744 char *spare_group,
1745 const char *metadata, int get_one)
1746{
1747 struct mdinfo *d, **dp, *disks = NULL;
1748
1749 /* get list of all disks in container */
1750 if (st->ss->getinfo_super_disks)
1751 disks = st->ss->getinfo_super_disks(st);
1752
1753 if (!disks)
1754 return disks;
1755 /* find spare devices on the list */
1756 dp = &disks->devs;
1757 disks->array.spare_disks = 0;
1758 while (*dp) {
1759 int found = 0;
1760 d = *dp;
1761 if (d->disk.state == 0) {
1762 /* check if size is acceptable */
1763 unsigned long long dev_size;
1764 dev_t dev = makedev(d->disk.major,d->disk.minor);
1765
1766 if (!min_size ||
1767 (dev_size_from_id(dev, &dev_size) &&
1768 dev_size >= min_size))
1769 found = 1;
1770 /* check if domain matches */
1771 if (found && domlist) {
1772 struct dev_policy *pol = devnum_policy(dev);
1773 if (spare_group)
1774 pol_add(&pol, pol_domain,
1775 spare_group, NULL);
e5508b36 1776 if (domain_test(domlist, pol, metadata) != 1)
326727d9
AC
1777 found = 0;
1778 dev_policy_free(pol);
1779 }
1780 }
1781 if (found) {
1782 dp = &d->next;
1783 disks->array.spare_disks++;
1784 if (get_one) {
1785 sysfs_free(*dp);
1786 d->next = NULL;
1787 }
1788 } else {
1789 *dp = d->next;
1790 d->next = NULL;
1791 sysfs_free(d);
1792 }
1793 }
1794 return disks;
1795}