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