tests: add device size tests when change raid leve to/from 0
[thirdparty/mdadm.git] / util.c
CommitLineData
64c4757e 1/*
9a9dab36 2 * mdadm - manage Linux "md" devices aka RAID arrays.
64c4757e 3 *
ca3b6696 4 * Copyright (C) 2001-2012 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>
a7dec3fd 31#include <sys/resource.h>
98c6faba 32#include <ctype.h>
a322f70c 33#include <dirent.h>
a931db9e 34#include <signal.h>
0a816ef9
NB
35
36/*
37 * following taken from linux/blkpg.h because they aren't
38 * anywhere else and it isn't safe to #include linux/ * stuff.
39 */
40
41#define BLKPG _IO(0x12,105)
42
43/* The argument structure */
44struct blkpg_ioctl_arg {
5d500228
N
45 int op;
46 int flags;
47 int datalen;
48 void *data;
0a816ef9
NB
49};
50
51/* The subfunctions (for the op field) */
52#define BLKPG_ADD_PARTITION 1
53#define BLKPG_DEL_PARTITION 2
54
55/* Sizes of name fields. Unused at present. */
56#define BLKPG_DEVNAMELTH 64
57#define BLKPG_VOLNAMELTH 64
58
59/* The data structure for ADD_PARTITION and DEL_PARTITION */
60struct blkpg_partition {
61 long long start; /* starting offset in bytes */
62 long long length; /* length in bytes */
63 int pno; /* partition number */
64 char devname[BLKPG_DEVNAMELTH]; /* partition name, like sda5 or c0d1p2,
65 to be used in kernel messages */
66 char volname[BLKPG_VOLNAMELTH]; /* volume label */
67};
64c4757e 68
0f22b998 69#include "part.h"
056b331e
N
70
71/* Force a compilation error if condition is true */
72#define BUILD_BUG_ON(condition) ((void)BUILD_BUG_ON_ZERO(condition))
73
74/* Force a compilation error if condition is true, but also produce a
75 result (of value 0 and type size_t), so the expression can be used
76 e.g. in a structure initializer (or where-ever else comma expressions
77 aren't permitted). */
78#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
79
64c4757e
NB
80/*
81 * Parse a 128 bit uuid in 4 integers
82 * format is 32 hexx nibbles with options :.<space> separator
83 * If not exactly 32 hex digits are found, return 0
84 * else return 1
85 */
86int parse_uuid(char *str, int uuid[4])
87{
aba69144
NB
88 int hit = 0; /* number of Hex digIT */
89 int i;
90 char c;
ca3b6696
N
91 for (i = 0; i < 4; i++)
92 uuid[i] = 0;
aba69144 93
ca3b6696 94 while ((c = *str++) != 0) {
aba69144 95 int n;
ca3b6696 96 if (c >= '0' && c <= '9')
aba69144 97 n = c-'0';
ca3b6696 98 else if (c >= 'a' && c <= 'f')
aba69144 99 n = 10 + c - 'a';
ca3b6696 100 else if (c >= 'A' && c <= 'F')
aba69144
NB
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
64c4757e
NB
117/*
118 * Get the md version number.
119 * We use the RAID_VERSION ioctl if it is supported
120 * If not, but we have a block device with major '9', we assume
121 * 0.36.0
122 *
123 * Return version number as 24 but number - assume version parts
124 * always < 255
125 */
126
127int md_get_version(int fd)
128{
5d500228
N
129 struct stat stb;
130 mdu_version_t vers;
131
132 if (fstat(fd, &stb)<0)
133 return -1;
134 if ((S_IFMT&stb.st_mode) != S_IFBLK)
135 return -1;
136
137 if (ioctl(fd, RAID_VERSION, &vers) == 0)
138 return (vers.major*10000) + (vers.minor*100) + vers.patchlevel;
139 if (errno == EACCES)
140 return -1;
141 if (major(stb.st_rdev) == MD_MAJOR)
142 return (3600);
64c4757e 143 return -1;
64c4757e
NB
144}
145
64c4757e
NB
146int get_linux_version()
147{
148 struct utsname name;
98c6faba 149 char *cp;
f161d047 150 int a = 0, b = 0,c = 0;
64c4757e
NB
151 if (uname(&name) <0)
152 return -1;
153
98c6faba
NB
154 cp = name.release;
155 a = strtoul(cp, &cp, 10);
f161d047
N
156 if (*cp == '.')
157 b = strtoul(cp+1, &cp, 10);
158 if (*cp == '.')
159 c = strtoul(cp+1, &cp, 10);
98c6faba 160
682c7051 161 return (a*1000000)+(b*1000)+c;
64c4757e
NB
162}
163
71204a50 164#ifndef MDASSEMBLE
bc77ed53
DW
165int mdadm_version(char *version)
166{
167 int a, b, c;
168 char *cp;
169
170 if (!version)
171 version = Version;
172
173 cp = strchr(version, '-');
174 if (!cp || *(cp+1) != ' ' || *(cp+2) != 'v')
175 return -1;
176 cp += 3;
177 a = strtoul(cp, &cp, 10);
178 if (*cp != '.')
179 return -1;
180 b = strtoul(cp+1, &cp, 10);
181 if (*cp == '.')
182 c = strtoul(cp+1, &cp, 10);
183 else
184 c = 0;
185 if (*cp != ' ' && *cp != '-')
186 return -1;
187 return (a*1000000)+(b*1000)+c;
188}
189
51d4261c 190unsigned long long parse_size(char *size)
84e11361
N
191{
192 /* parse 'size' which should be a number optionally
193 * followed by 'K', 'M', or 'G'.
194 * Without a suffix, K is assumed.
195 * Number returned is in sectors (half-K)
822e393a 196 * INVALID_SECTORS returned on error.
84e11361
N
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;
72ca9bcf
N
215 case 's': /* sectors */
216 c++;
217 break;
84e11361 218 }
51d4261c 219 } else
822e393a 220 s = INVALID_SECTORS;
84e11361 221 if (*c)
822e393a 222 s = INVALID_SECTORS;
84e11361
N
223 return s;
224}
225
4a06e2c2
N
226int parse_layout_10(char *layout)
227{
228 int copies, rv;
229 char *cp;
230 /* Parse the layout string for raid10 */
231 /* 'f', 'o' or 'n' followed by a number <= raid_disks */
232 if ((layout[0] != 'n' && layout[0] != 'f' && layout[0] != 'o') ||
233 (copies = strtoul(layout+1, &cp, 10)) < 1 ||
234 copies > 200 ||
235 *cp)
236 return -1;
237 if (layout[0] == 'n')
238 rv = 256 + copies;
239 else if (layout[0] == 'o')
240 rv = 0x10000 + (copies<<8) + 1;
241 else
242 rv = 1 + (copies<<8);
243 return rv;
244}
245
246int parse_layout_faulty(char *layout)
247{
248 /* Parse the layout string for 'faulty' */
249 int ln = strcspn(layout, "0123456789");
503975b9 250 char *m = xstrdup(layout);
4a06e2c2
N
251 int mode;
252 m[ln] = 0;
253 mode = map_name(faultylayout, m);
254 if (mode == UnSet)
255 return -1;
256
257 return mode | (atoi(layout+ln)<< ModeShift);
258}
79868890
N
259
260long parse_num(char *num)
261{
262 /* Either return a valid number, or -1 */
263 char *c;
264 long rv = strtol(num, &c, 10);
265 if (rv < 0 || *c || !num[0])
266 return -1;
267 else
268 return rv;
269}
eb3929a4 270#endif
4a06e2c2 271
0430ed48
NB
272void remove_partitions(int fd)
273{
274 /* remove partitions from this block devices.
275 * This is used for components added to an array
276 */
277#ifdef BLKPG_DEL_PARTITION
278 struct blkpg_ioctl_arg a;
279 struct blkpg_partition p;
280
281 a.op = BLKPG_DEL_PARTITION;
282 a.data = (void*)&p;
283 a.datalen = sizeof(p);
284 a.flags = 0;
285 memset(a.data, 0, a.datalen);
ca3b6696 286 for (p.pno = 0; p.pno < 16; p.pno++)
0430ed48
NB
287 ioctl(fd, BLKPG, &a);
288#endif
289}
290
691c6ee1
N
291int test_partition(int fd)
292{
293 /* Check if fd is a whole-disk or a partition.
294 * BLKPG will return EINVAL on a partition, and BLKPG_DEL_PARTITION
295 * will return ENXIO on an invalid partition number.
296 */
297 struct blkpg_ioctl_arg a;
298 struct blkpg_partition p;
299 a.op = BLKPG_DEL_PARTITION;
300 a.data = (void*)&p;
301 a.datalen = sizeof(p);
302 a.flags = 0;
303 memset(a.data, 0, a.datalen);
304 p.pno = 1<<30;
305 if (ioctl(fd, BLKPG, &a) == 0)
306 /* Very unlikely, but not a partition */
307 return 0;
308 if (errno == ENXIO)
309 /* not a partition */
310 return 0;
311
312 return 1;
313}
314
bfd76b93
CA
315int test_partition_from_id(dev_t id)
316{
317 char buf[20];
318 int fd, rv;
319
320 sprintf(buf, "%d:%d", major(id), minor(id));
321 fd = dev_open(buf, O_RDONLY);
322 if (fd < 0)
323 return -1;
324 rv = test_partition(fd);
325 close(fd);
326 return rv;
327}
691c6ee1 328
de5a472e 329int enough(int level, int raid_disks, int layout, int clean, char *avail)
64c4757e 330{
265e0f17 331 int copies, first;
de5a472e
N
332 int i;
333 int avail_disks = 0;
334
335 for (i = 0; i < raid_disks; i++)
336 avail_disks += !!avail[i];
337
64c4757e 338 switch (level) {
265e0f17
NB
339 case 10:
340 /* This is the tricky one - we need to check
341 * which actual disks are present.
342 */
702b557b 343 copies = (layout&255)* ((layout>>8) & 255);
ca3b6696 344 first = 0;
265e0f17
NB
345 do {
346 /* there must be one of the 'copies' form 'first' */
347 int n = copies;
ca3b6696 348 int cnt = 0;
b3ec716d 349 int this = first;
265e0f17 350 while (n--) {
b3ec716d 351 if (avail[this])
265e0f17 352 cnt++;
b3ec716d 353 this = (this+1) % raid_disks;
265e0f17
NB
354 }
355 if (cnt == 0)
356 return 0;
b3ec716d 357 first = (first+(layout&255)) % raid_disks;
265e0f17
NB
358 } while (first != 0);
359 return 1;
e5329c37 360
df0d4ea0 361 case LEVEL_MULTIPATH:
e0d19036 362 return avail_disks>= 1;
df0d4ea0 363 case LEVEL_LINEAR:
64c4757e
NB
364 case 0:
365 return avail_disks == raid_disks;
366 case 1:
367 return avail_disks >= 1;
368 case 4:
369 case 5:
583315d9
NB
370 if (clean)
371 return avail_disks >= raid_disks-1;
372 else
373 return avail_disks >= raid_disks;
98c6faba 374 case 6:
583315d9
NB
375 if (clean)
376 return avail_disks >= raid_disks-2;
377 else
378 return avail_disks >= raid_disks;
64c4757e
NB
379 default:
380 return 0;
381 }
382}
383
8453e704
N
384int enough_fd(int fd)
385{
386 struct mdu_array_info_s array;
387 struct mdu_disk_info_s disk;
388 int avail_disks = 0;
aabe020d 389 int i, rv;
8453e704
N
390 char *avail;
391
392 if (ioctl(fd, GET_ARRAY_INFO, &array) != 0 ||
393 array.raid_disks <= 0)
394 return 0;
503975b9 395 avail = xcalloc(array.raid_disks, 1);
ca3b6696 396 for (i = 0; i < MAX_DISKS && array.nr_disks > 0; i++) {
8453e704
N
397 disk.number = i;
398 if (ioctl(fd, GET_DISK_INFO, &disk) != 0)
399 continue;
9e6d9291
N
400 if (disk.major == 0 && disk.minor == 0)
401 continue;
402 array.nr_disks--;
403
8453e704
N
404 if (! (disk.state & (1<<MD_DISK_SYNC)))
405 continue;
406 if (disk.raid_disk < 0 || disk.raid_disk >= array.raid_disks)
407 continue;
408 avail_disks++;
409 avail[disk.raid_disk] = 1;
410 }
411 /* This is used on an active array, so assume it is clean */
aabe020d 412 rv = enough(array.level, array.raid_disks, array.layout,
de5a472e 413 1, avail);
aabe020d
JS
414 free(avail);
415 return rv;
8453e704
N
416}
417
22e263f6
AC
418const int uuid_zero[4] = { 0, 0, 0, 0 };
419
f277ce36 420int same_uuid(int a[4], int b[4], int swapuuid)
64c4757e 421{
f277ce36
NB
422 if (swapuuid) {
423 /* parse uuids are hostendian.
424 * uuid's from some superblocks are big-ending
aba69144 425 * if there is a difference, we need to swap..
f277ce36
NB
426 */
427 unsigned char *ac = (unsigned char *)a;
428 unsigned char *bc = (unsigned char *)b;
429 int i;
ca3b6696 430 for (i = 0; i < 16; i += 4) {
f277ce36
NB
431 if (ac[i+0] != bc[i+3] ||
432 ac[i+1] != bc[i+2] ||
433 ac[i+2] != bc[i+1] ||
434 ac[i+3] != bc[i+0])
435 return 0;
436 }
437 return 1;
438 } else {
439 if (a[0]==b[0] &&
440 a[1]==b[1] &&
441 a[2]==b[2] &&
442 a[3]==b[3])
443 return 1;
444 return 0;
445 }
64c4757e 446}
ca3b6696 447
350f29f9
NB
448void copy_uuid(void *a, int b[4], int swapuuid)
449{
450 if (swapuuid) {
451 /* parse uuids are hostendian.
452 * uuid's from some superblocks are big-ending
453 * if there is a difference, we need to swap..
454 */
455 unsigned char *ac = (unsigned char *)a;
456 unsigned char *bc = (unsigned char *)b;
457 int i;
ca3b6696 458 for (i = 0; i < 16; i += 4) {
350f29f9
NB
459 ac[i+0] = bc[i+3];
460 ac[i+1] = bc[i+2];
461 ac[i+2] = bc[i+1];
462 ac[i+3] = bc[i+0];
463 }
464 } else
465 memcpy(a, b, 16);
466}
64c4757e 467
aae5a112 468char *__fname_from_uuid(int id[4], int swap, char *buf, char sep)
d7288ddc 469{
9968e376 470 int i, j;
d7288ddc
N
471 char uuid[16];
472 char *c = buf;
473 strcpy(c, "UUID-");
474 c += strlen(c);
aae5a112 475 copy_uuid(uuid, id, swap);
9968e376 476 for (i = 0; i < 4; i++) {
9968e376 477 if (i)
ff54de6e 478 *c++ = sep;
9968e376
DW
479 for (j = 3; j >= 0; j--) {
480 sprintf(c,"%02x", (unsigned char) uuid[j+4*i]);
481 c+= 2;
482 }
d7288ddc
N
483 }
484 return buf;
aae5a112
DW
485
486}
487
488char *fname_from_uuid(struct supertype *st, struct mdinfo *info, char *buf, char sep)
489{
86983cce
N
490 // dirty hack to work around an issue with super1 superblocks...
491 // super1 superblocks need swapuuid set in order for assembly to
492 // work, but can't have it set if we want this printout to match
493 // all the other uuid printouts in super1.c, so we force swapuuid
494 // to 1 to make our printout match the rest of super1
495 return __fname_from_uuid(info->uuid, (st->ss == &super1) ? 1 : st->ss->swapuuid, buf, sep);
d7288ddc
N
496}
497
435d4ebb 498#ifndef MDASSEMBLE
682c7051
NB
499int check_ext2(int fd, char *name)
500{
501 /*
502 * Check for an ext2fs file system.
503 * Superblock is always 1K at 1K offset
504 *
505 * s_magic is le16 at 56 == 0xEF53
506 * report mtime - le32 at 44
507 * blocks - le32 at 4
508 * logblksize - le32 at 24
509 */
510 unsigned char sb[1024];
511 time_t mtime;
512 int size, bsize;
513 if (lseek(fd, 1024,0)!= 1024)
514 return 0;
515 if (read(fd, sb, 1024)!= 1024)
516 return 0;
517 if (sb[56] != 0x53 || sb[57] != 0xef)
518 return 0;
519
520 mtime = sb[44]|(sb[45]|(sb[46]|sb[47]<<8)<<8)<<8;
521 bsize = sb[24]|(sb[25]|(sb[26]|sb[27]<<8)<<8)<<8;
522 size = sb[4]|(sb[5]|(sb[6]|sb[7]<<8)<<8)<<8;
e7b84f9d 523 pr_err("%s appears to contain an ext2fs file system\n",
682c7051 524 name);
d33f1518 525 cont_err("size=%dK mtime=%s",
682c7051
NB
526 size*(1<<bsize), ctime(&mtime));
527 return 1;
528}
529
530int check_reiser(int fd, char *name)
531{
532 /*
533 * superblock is at 64K
534 * size is 1024;
535 * Magic string "ReIsErFs" or "ReIsEr2Fs" at 52
536 *
537 */
538 unsigned char sb[1024];
881990a2 539 unsigned long size;
682c7051
NB
540 if (lseek(fd, 64*1024, 0) != 64*1024)
541 return 0;
542 if (read(fd, sb, 1024) != 1024)
543 return 0;
ca3b6696
N
544 if (strncmp((char*)sb+52, "ReIsErFs",8) != 0 &&
545 strncmp((char*)sb+52, "ReIsEr2Fs",9) != 0)
682c7051 546 return 0;
e7b84f9d 547 pr_err("%s appears to contain a reiserfs file system\n",name);
682c7051 548 size = sb[0]|(sb[1]|(sb[2]|sb[3]<<8)<<8)<<8;
d33f1518 549 cont_err("size = %luK\n", size*4);
aba69144 550
682c7051
NB
551 return 1;
552}
553
554int check_raid(int fd, char *name)
555{
4b1ac34b 556 struct mdinfo info;
682c7051 557 time_t crtime;
d078d77c 558 char *level;
82d9eba6 559 struct supertype *st = guess_super(fd);
f9ce90ba 560
cb8f6859
N
561 if (!st)
562 return 0;
3da92f27 563 st->ss->load_super(st, fd, name);
82d9eba6 564 /* Looks like a raid array .. */
e7b84f9d 565 pr_err("%s appears to be part of a raid array:\n",
82d9eba6 566 name);
a5d85af7 567 st->ss->getinfo_super(st, &info, NULL);
3da92f27 568 st->ss->free_super(st);
82d9eba6 569 crtime = info.array.ctime;
d078d77c
NB
570 level = map_num(pers, info.array.level);
571 if (!level) level = "-unknown-";
d33f1518
N
572 cont_err("level=%s devices=%d ctime=%s",
573 level, info.array.raid_disks, ctime(&crtime));
82d9eba6 574 return 1;
682c7051
NB
575}
576
682c7051
NB
577int ask(char *mesg)
578{
579 char *add = "";
580 int i;
ca3b6696 581 for (i = 0; i < 5; i++) {
682c7051
NB
582 char buf[100];
583 fprintf(stderr, "%s%s", mesg, add);
584 fflush(stderr);
585 if (fgets(buf, 100, stdin)==NULL)
586 return 0;
587 if (buf[0]=='y' || buf[0]=='Y')
588 return 1;
589 if (buf[0]=='n' || buf[0]=='N')
590 return 0;
591 add = "(y/n) ";
592 }
e7b84f9d 593 pr_err("assuming 'no'\n");
682c7051
NB
594 return 0;
595}
435d4ebb 596#endif /* MDASSEMBLE */
682c7051 597
8d80900b 598int is_standard(char *dev, int *nump)
e5329c37
NB
599{
600 /* tests if dev is a "standard" md dev name.
601 * i.e if the last component is "/dNN" or "/mdNN",
aba69144 602 * where NN is a string of digits
598f0d58
NB
603 * Returns 1 if a partitionable standard,
604 * -1 if non-partitonable,
605 * 0 if not a standard name.
e5329c37 606 */
8d80900b 607 char *d = strrchr(dev, '/');
ca3b6696 608 int type = 0;
8d80900b
NB
609 int num;
610 if (!d)
e5329c37 611 return 0;
ca3b6696
N
612 if (strncmp(d, "/d",2) == 0)
613 d += 2, type = 1; /* /dev/md/dN{pM} */
614 else if (strncmp(d, "/md_d", 5) == 0)
615 d += 5, type = 1; /* /dev/md_dN{pM} */
616 else if (strncmp(d, "/md", 3) == 0)
617 d += 3, type = -1; /* /dev/mdN */
618 else if (d-dev > 3 && strncmp(d-2, "md/", 3) == 0)
619 d += 1, type = -1; /* /dev/md/N */
e5329c37
NB
620 else
621 return 0;
8d80900b 622 if (!*d)
e5329c37 623 return 0;
8d80900b
NB
624 num = atoi(d);
625 while (isdigit(*d))
626 d++;
627 if (*d)
e5329c37 628 return 0;
8d80900b
NB
629 if (nump) *nump = num;
630
631 return type;
e5329c37
NB
632}
633
4b1ac34b 634unsigned long calc_csum(void *super, int bytes)
82b27616 635{
56eb10c0 636 unsigned long long newcsum = 0;
82b27616 637 int i;
4b1ac34b
NB
638 unsigned int csum;
639 unsigned int *superc = (unsigned int*) super;
82b27616 640
ca3b6696
N
641 for(i = 0; i < bytes/4; i++)
642 newcsum += superc[i];
82b27616 643 csum = (newcsum& 0xffffffff) + (newcsum>>32);
570c0542 644#ifdef __alpha__
aba69144 645/* The in-kernel checksum calculation is always 16bit on
570c0542 646 * the alpha, though it is 32 bit on i386...
ca3b6696 647 * I wonder what it is elsewhere... (it uses an API in
570c0542
NB
648 * a way that it shouldn't).
649 */
650 csum = (csum & 0xffff) + (csum >> 16);
651 csum = (csum & 0xffff) + (csum >> 16);
652#endif
82b27616
NB
653 return csum;
654}
cd29a5c8 655
435d4ebb 656#ifndef MDASSEMBLE
56eb10c0 657char *human_size(long long bytes)
cd29a5c8
NB
658{
659 static char buf[30];
d5d3721e
NB
660
661 /* We convert bytes to either centi-M{ega,ibi}bytes or
662 * centi-G{igi,ibi}bytes, with appropriate rounding,
663 * and then print 1/100th of those as a decimal.
664 * We allow upto 2048Megabytes before converting to
665 * gigabytes, as that shows more precision and isn't
666 * too large a number.
01619b48 667 * Terabytes are not yet handled.
d5d3721e 668 */
cd29a5c8 669
56eb10c0 670 if (bytes < 5000*1024)
ca3b6696 671 buf[0] = 0;
d5d3721e
NB
672 else if (bytes < 2*1024LL*1024LL*1024LL) {
673 long cMiB = (bytes / ( (1LL<<20) / 200LL ) +1) /2;
674 long cMB = (bytes / ( 1000000LL / 200LL ) +1) /2;
8f23b0b3 675 snprintf(buf, sizeof(buf), " (%ld.%02ld MiB %ld.%02ld MB)",
d5d3721e
NB
676 cMiB/100 , cMiB % 100,
677 cMB/100, cMB % 100);
678 } else {
679 long cGiB = (bytes / ( (1LL<<30) / 200LL ) +1) /2;
680 long cGB = (bytes / (1000000000LL/200LL ) +1) /2;
8f23b0b3 681 snprintf(buf, sizeof(buf), " (%ld.%02ld GiB %ld.%02ld GB)",
d5d3721e
NB
682 cGiB/100 , cGiB % 100,
683 cGB/100, cGB % 100);
684 }
cd29a5c8
NB
685 return buf;
686}
e0d19036 687
f0ec6710 688char *human_size_brief(long long bytes, int prefix)
e0d19036
NB
689{
690 static char buf[30];
e0d19036 691
570abc6f
MN
692 /* We convert bytes to either centi-M{ega,ibi}bytes or
693 * centi-G{igi,ibi}bytes, with appropriate rounding,
694 * and then print 1/100th of those as a decimal.
695 * We allow upto 2048Megabytes before converting to
696 * gigabytes, as that shows more precision and isn't
697 * too large a number.
698 * Terabytes are not yet handled.
f0ec6710
MN
699 *
700 * If prefix == IEC, we mean prefixes like kibi,mebi,gibi etc.
701 * If prefix == JEDEC, we mean prefixes like kilo,mega,giga etc.
570abc6f
MN
702 */
703
e0d19036 704 if (bytes < 5000*1024)
570abc6f 705 buf[0] = 0;
f0ec6710
MN
706 else if (prefix == IEC) {
707 if (bytes < 2*1024LL*1024LL*1024LL) {
708 long cMiB = (bytes / ( (1LL<<20) / 200LL ) +1) /2;
709 snprintf(buf, sizeof(buf), "%ld.%02ldMiB",
710 cMiB/100 , cMiB % 100);
711 } else {
712 long cGiB = (bytes / ( (1LL<<30) / 200LL ) +1) /2;
713 snprintf(buf, sizeof(buf), "%ld.%02ldGiB",
714 cGiB/100 , cGiB % 100);
715 }
716 }
717 else if (prefix == JEDEC) {
718 if (bytes < 2*1024LL*1024LL*1024LL) {
719 long cMB = (bytes / ( 1000000LL / 200LL ) +1) /2;
720 snprintf(buf, sizeof(buf), "%ld.%02ldMB",
721 cMB/100, cMB % 100);
722 } else {
723 long cGB = (bytes / (1000000000LL/200LL ) +1) /2;
724 snprintf(buf, sizeof(buf), "%ld.%02ldGB",
725 cGB/100 , cGB % 100);
726 }
570abc6f 727 }
f0ec6710
MN
728 else
729 buf[0] = 0;
570abc6f 730
e0d19036
NB
731 return buf;
732}
e4965ef8
N
733
734void print_r10_layout(int layout)
735{
736 int near = layout & 255;
737 int far = (layout >> 8) & 255;
738 int offset = (layout&0x10000);
739 char *sep = "";
740
741 if (near != 1) {
742 printf("%s near=%d", sep, near);
743 sep = ",";
744 }
745 if (far != 1)
746 printf("%s %s=%d", sep, offset?"offset":"far", far);
747 if (near*far == 1)
748 printf("NO REDUNDANCY");
749}
435d4ebb 750#endif
e0d19036 751
5f8097be
NB
752unsigned long long calc_array_size(int level, int raid_disks, int layout,
753 int chunksize, unsigned long long devsize)
577e8448 754{
e03640bd
CA
755 if (level == 1)
756 return devsize;
577e8448
AK
757 devsize &= ~(unsigned long long)((chunksize>>9)-1);
758 return get_data_disks(level, layout, raid_disks) * devsize;
759}
760
761int get_data_disks(int level, int layout, int raid_disks)
5f8097be
NB
762{
763 int data_disks = 0;
764 switch (level) {
ca3b6696
N
765 case 0: data_disks = raid_disks;
766 break;
767 case 1: data_disks = 1;
768 break;
5f8097be 769 case 4:
ca3b6696
N
770 case 5: data_disks = raid_disks - 1;
771 break;
772 case 6: data_disks = raid_disks - 2;
773 break;
5f8097be
NB
774 case 10: data_disks = raid_disks / (layout & 255) / ((layout>>8)&255);
775 break;
776 }
577e8448
AK
777
778 return data_disks;
5f8097be
NB
779}
780
4dd2df09
N
781int devnm2devid(char *devnm)
782{
783 /* First look in /sys/block/$DEVNM/dev for %d:%d
784 * If that fails, try parsing out a number
785 */
786 char path[100];
787 char *ep;
788 int fd;
789 int mjr,mnr;
790
791 sprintf(path, "/sys/block/%s/dev", devnm);
792 fd = open(path, O_RDONLY);
793 if (fd >= 0) {
794 char buf[20];
795 int n = read(fd, buf, sizeof(buf));
796 close(fd);
797 if (n > 0)
798 buf[n] = 0;
799 if (n > 0 && sscanf(buf, "%d:%d\n", &mjr, &mnr) == 2)
800 return makedev(mjr, mnr);
801 }
802 if (strncmp(devnm, "md_d", 4) == 0 &&
803 isdigit(devnm[4]) &&
804 (mnr = strtoul(devnm+4, &ep, 10)) >= 0 &&
805 ep > devnm && *ep == 0)
806 return makedev(get_mdp_major(), mnr << MdpMinorShift);
807
808 if (strncmp(devnm, "md", 2) == 0 &&
809 isdigit(devnm[2]) &&
810 (mnr = strtoul(devnm+2, &ep, 10)) >= 0 &&
811 ep > devnm && *ep == 0)
812 return makedev(MD_MAJOR, mnr);
813
814 return 0;
815}
816
5a23a06e 817#if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO)
4dd2df09 818char *get_md_name(char *devnm)
e0d19036
NB
819{
820 /* find /dev/md%d or /dev/md/%d or make a device /dev/.tmp.md%d */
98c6faba 821 /* if dev < 0, want /dev/md/d%d or find mdp in /proc/devices ... */
4dd2df09 822
e0d19036
NB
823 static char devname[50];
824 struct stat stb;
4dd2df09 825 dev_t rdev = devnm2devid(devnm);
dd0781e5 826 char *dn;
98c6faba 827
4dd2df09
N
828 if (rdev == 0)
829 return 0;
830 if (strncmp(devnm, "md_", 3) == 0) {
831 snprintf(devname, sizeof(devname), "/dev/md/%s",
832 devnm + 3);
98c6faba
NB
833 if (stat(devname, &stb) == 0
834 && (S_IFMT&stb.st_mode) == S_IFBLK
835 && (stb.st_rdev == rdev))
836 return devname;
837 }
4dd2df09
N
838 snprintf(devname, sizeof(devname), "/dev/%s", devnm);
839 if (stat(devname, &stb) == 0
840 && (S_IFMT&stb.st_mode) == S_IFBLK
841 && (stb.st_rdev == rdev))
842 return devname;
843
844 snprintf(devname, sizeof(devname), "/dev/md/%s", devnm+2);
845 if (stat(devname, &stb) == 0
846 && (S_IFMT&stb.st_mode) == S_IFBLK
847 && (stb.st_rdev == rdev))
848 return devname;
849
16c6fa80 850 dn = map_dev(major(rdev), minor(rdev), 0);
dd0781e5
NB
851 if (dn)
852 return dn;
4dd2df09 853 snprintf(devname, sizeof(devname), "/dev/.tmp.%s", devnm);
e0d19036 854 if (mknod(devname, S_IFBLK | 0600, rdev) == -1)
dd0781e5
NB
855 if (errno != EEXIST)
856 return NULL;
e0d19036
NB
857
858 if (stat(devname, &stb) == 0
859 && (S_IFMT&stb.st_mode) == S_IFBLK
860 && (stb.st_rdev == rdev))
861 return devname;
862 unlink(devname);
863 return NULL;
864}
865
866void put_md_name(char *name)
867{
ca3b6696 868 if (strncmp(name, "/dev/.tmp.md", 12) == 0)
e0d19036
NB
869 unlink(name);
870}
ea24acd0 871
4dd2df09 872char *find_free_devnm(int use_partitions)
ea24acd0 873{
4dd2df09 874 static char devnm[32];
ea24acd0
NB
875 int devnum;
876 for (devnum = 127; devnum != 128;
a56fb7ec 877 devnum = devnum ? devnum-1 : (1<<20)-1) {
ea24acd0 878
4dd2df09
N
879 if (use_partitions)
880 sprintf(devnm, "md_d%d", devnum);
881 else
882 sprintf(devnm, "md%d", devnum);
883 if (mddev_busy(devnm))
ea24acd0 884 continue;
4dd2df09 885 if (!conf_name_is_free(devnm))
fb52f245 886 continue;
06d2ffc3
N
887 if (!use_udev()) {
888 /* make sure it is new to /dev too, at least as a
889 * non-standard */
4dd2df09
N
890 int devid = devnm2devid(devnm);
891 if (devid) {
892 char *dn = map_dev(major(devid),
893 minor(devid), 0);
894 if (dn && ! is_standard(dn, NULL))
895 continue;
896 }
06d2ffc3 897 }
ea24acd0
NB
898 break;
899 }
900 if (devnum == 128)
4dd2df09
N
901 return NULL;
902 return devnm;
ea24acd0 903}
435d4ebb 904#endif /* !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) */
f9ce90ba 905
8b0dabea
NB
906int dev_open(char *dev, int flags)
907{
908 /* like 'open', but if 'dev' matches %d:%d, create a temp
909 * block device and open that
910 */
911 char *e;
912 int fd = -1;
913 char devname[32];
e81cdd9f 914 int major;
8b0dabea 915 int minor;
e81cdd9f
NB
916
917 if (!dev) return -1;
6df6a774 918 flags |= O_DIRECT;
e81cdd9f
NB
919
920 major = strtoul(dev, &e, 0);
8b0dabea
NB
921 if (e > dev && *e == ':' && e[1] &&
922 (minor = strtoul(e+1, &e, 0)) >= 0 &&
923 *e == 0) {
9dc7d357
N
924 snprintf(devname, sizeof(devname), "/dev/.tmp.md.%d:%d:%d",
925 (int)getpid(), major, minor);
926 if (mknod(devname, S_IFBLK|0600, makedev(major, minor)) == 0) {
927 fd = open(devname, flags);
928 unlink(devname);
6df6a774
N
929 }
930 if (fd < 0) {
9dc7d357 931 /* Try /tmp as /dev appear to be read-only */
6df6a774
N
932 snprintf(devname, sizeof(devname), "/tmp/.tmp.md.%d:%d:%d",
933 (int)getpid(), major, minor);
ca3b6696 934 if (mknod(devname, S_IFBLK|0600, makedev(major, minor)) == 0) {
6df6a774
N
935 fd = open(devname, flags);
936 unlink(devname);
937 }
8b0dabea
NB
938 }
939 } else
6df6a774 940 fd = open(dev, flags);
8b0dabea
NB
941 return fd;
942}
f9ce90ba 943
4dd2df09 944int open_dev_flags(char *devnm, int flags)
e8a70c89 945{
4dd2df09 946 int devid;
e8a70c89
N
947 char buf[20];
948
4dd2df09
N
949 devid = devnm2devid(devnm);
950 sprintf(buf, "%d:%d", major(devid), minor(devid));
d998b738
N
951 return dev_open(buf, flags);
952}
953
4dd2df09 954int open_dev(char *devnm)
d998b738 955{
4dd2df09 956 return open_dev_flags(devnm, O_RDONLY);
e8a70c89
N
957}
958
4dd2df09 959int open_dev_excl(char *devnm)
a931db9e
NB
960{
961 char buf[20];
962 int i;
7187750e 963 int flags = O_RDWR;
4dd2df09 964 int devid = devnm2devid(devnm);
a931db9e 965
4dd2df09 966 sprintf(buf, "%d:%d", major(devid), minor(devid));
ca3b6696 967 for (i = 0 ; i < 25 ; i++) {
7187750e 968 int fd = dev_open(buf, flags|O_EXCL);
a931db9e
NB
969 if (fd >= 0)
970 return fd;
7187750e
N
971 if (errno == EACCES && flags == O_RDWR) {
972 flags = O_RDONLY;
973 continue;
974 }
a931db9e
NB
975 if (errno != EBUSY)
976 return fd;
977 usleep(200000);
978 }
979 return -1;
980}
981
9008ed1c
N
982int same_dev(char *one, char *two)
983{
984 struct stat st1, st2;
985 if (stat(one, &st1) != 0)
986 return 0;
987 if (stat(two, &st2) != 0)
988 return 0;
989 if ((st1.st_mode & S_IFMT) != S_IFBLK)
990 return 0;
991 if ((st2.st_mode & S_IFMT) != S_IFBLK)
992 return 0;
993 return st1.st_rdev == st2.st_rdev;
994}
995
a7c6e3fb 996void wait_for(char *dev, int fd)
a714580e
N
997{
998 int i;
a7c6e3fb
N
999 struct stat stb_want;
1000
1001 if (fstat(fd, &stb_want) != 0 ||
1002 (stb_want.st_mode & S_IFMT) != S_IFBLK)
1003 return;
a714580e 1004
ca3b6696 1005 for (i = 0 ; i < 25 ; i++) {
a714580e 1006 struct stat stb;
a7c6e3fb
N
1007 if (stat(dev, &stb) == 0 &&
1008 (stb.st_mode & S_IFMT) == S_IFBLK &&
1009 (stb.st_rdev == stb_want.st_rdev))
a714580e
N
1010 return;
1011 usleep(200000);
1012 }
436305c6
DW
1013 if (i == 25)
1014 dprintf("%s: timeout waiting for %s\n", __func__, dev);
a714580e
N
1015}
1016
0f22b998
N
1017struct superswitch *superlist[] =
1018{
1019 &super0, &super1,
1020 &super_ddf, &super_imsm,
0592faeb 1021 &mbr, &gpt,
0f22b998 1022 NULL };
f9ce90ba 1023
ea24acd0 1024#if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO)
f7dd881f 1025
4725bc31 1026struct supertype *super_by_fd(int fd, char **subarrayp)
f9ce90ba 1027{
1686dc25
NB
1028 mdu_array_info_t array;
1029 int vers;
1030 int minor;
1031 struct supertype *st = NULL;
7e0f6979 1032 struct mdinfo *sra;
142cb9e1 1033 char *verstr;
1686dc25
NB
1034 char version[20];
1035 int i;
f7e7067b 1036 char *subarray = NULL;
4dd2df09 1037 char container[32] = "";
1686dc25 1038
4dd2df09 1039 sra = sysfs_read(fd, NULL, GET_VERSION);
1686dc25
NB
1040
1041 if (sra) {
7e0f6979
NB
1042 vers = sra->array.major_version;
1043 minor = sra->array.minor_version;
142cb9e1 1044 verstr = sra->text_version;
1686dc25
NB
1045 } else {
1046 if (ioctl(fd, GET_ARRAY_INFO, &array))
1047 array.major_version = array.minor_version = 0;
1048 vers = array.major_version;
1049 minor = array.minor_version;
142cb9e1 1050 verstr = "";
6fbba4c9 1051 }
82d9eba6 1052
1686dc25
NB
1053 if (vers != -1) {
1054 sprintf(version, "%d.%d", vers, minor);
1055 verstr = version;
6fbba4c9 1056 }
3c558363 1057 if (minor == -2 && is_subarray(verstr)) {
f7e7067b 1058 char *dev = verstr+1;
5f7e44b2 1059
f7e7067b 1060 subarray = strchr(dev, '/');
92d49ecf 1061 if (subarray) {
f7e7067b 1062 *subarray++ = '\0';
503975b9 1063 subarray = xstrdup(subarray);
92d49ecf 1064 }
4dd2df09 1065 strcpy(container, dev);
f7e7067b
NB
1066 if (sra)
1067 sysfs_free(sra);
5f7e44b2 1068 sra = sysfs_read(-1, container, GET_VERSION);
603f24a0
N
1069 if (sra && sra->text_version[0])
1070 verstr = sra->text_version;
1071 else
1072 verstr = "-no-metadata-";
f7e7067b
NB
1073 }
1074
1075 for (i = 0; st == NULL && superlist[i] ; i++)
1076 st = superlist[i]->match_metadata_desc(verstr);
1686dc25
NB
1077
1078 if (sra)
1079 sysfs_free(sra);
f7e7067b 1080 if (st) {
3b0896f8 1081 st->sb = NULL;
1f49fb3a
N
1082 if (subarrayp)
1083 *subarrayp = subarray;
4dd2df09
N
1084 strcpy(st->container_devnm, container);
1085 strcpy(st->devnm, fd2devnm(fd));
4725bc31
N
1086 } else
1087 free(subarray);
5f7e44b2 1088
82d9eba6 1089 return st;
f9ce90ba 1090}
ea24acd0
NB
1091#endif /* !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) */
1092
0f0749ad 1093int dev_size_from_id(dev_t id, unsigned long long *size)
52d5d101
AC
1094{
1095 char buf[20];
1096 int fd;
1097
1098 sprintf(buf, "%d:%d", major(id), minor(id));
1099 fd = dev_open(buf, O_RDONLY);
1100 if (fd < 0)
1101 return 0;
1102 if (get_dev_size(fd, NULL, size)) {
1103 close(fd);
1104 return 1;
1105 }
1106 close(fd);
1107 return 0;
1108}
f9ce90ba 1109
159c3a1a 1110struct supertype *dup_super(struct supertype *orig)
3da92f27 1111{
159c3a1a 1112 struct supertype *st;
1686dc25 1113
d2ca6449
NB
1114 if (!orig)
1115 return orig;
503975b9 1116 st = xcalloc(1, sizeof(*st));
159c3a1a
NB
1117 st->ss = orig->ss;
1118 st->max_devs = orig->max_devs;
1119 st->minor_version = orig->minor_version;
cb8f6859 1120 st->ignore_hw_compat = orig->ignore_hw_compat;
159c3a1a
NB
1121 st->sb = NULL;
1122 st->info = NULL;
1123 return st;
3da92f27
NB
1124}
1125
54887ad8 1126struct supertype *guess_super_type(int fd, enum guess_types guess_type)
f9ce90ba
NB
1127{
1128 /* try each load_super to find the best match,
1129 * and return the best superswitch
1130 */
82d9eba6
NB
1131 struct superswitch *ss;
1132 struct supertype *st;
f21e18ca 1133 time_t besttime = 0;
570c0542 1134 int bestsuper = -1;
f9ce90ba
NB
1135 int i;
1136
503975b9 1137 st = xcalloc(1, sizeof(*st));
4dd2df09 1138 st->container_devnm[0] = 0;
d1d599ea 1139
ca3b6696 1140 for (i = 0 ; superlist[i]; i++) {
f9ce90ba
NB
1141 int rv;
1142 ss = superlist[i];
54887ad8
N
1143 if (guess_type == guess_array && ss->add_to_super == NULL)
1144 continue;
1145 if (guess_type == guess_partitions && ss->add_to_super != NULL)
1146 continue;
ef609477 1147 memset(st, 0, sizeof(*st));
df3346e6 1148 st->ignore_hw_compat = 1;
3da92f27 1149 rv = ss->load_super(st, fd, NULL);
570c0542
NB
1150 if (rv == 0) {
1151 struct mdinfo info;
a5d85af7 1152 st->ss->getinfo_super(st, &info, NULL);
570c0542
NB
1153 if (bestsuper == -1 ||
1154 besttime < info.array.ctime) {
1155 bestsuper = i;
1156 besttime = info.array.ctime;
570c0542 1157 }
3da92f27 1158 ss->free_super(st);
570c0542
NB
1159 }
1160 }
1161 if (bestsuper != -1) {
1162 int rv;
ef609477 1163 memset(st, 0, sizeof(*st));
df3346e6 1164 st->ignore_hw_compat = 1;
3da92f27 1165 rv = superlist[bestsuper]->load_super(st, fd, NULL);
f9ce90ba 1166 if (rv == 0) {
5e747af2 1167 superlist[bestsuper]->free_super(st);
82d9eba6 1168 return st;
f9ce90ba
NB
1169 }
1170 }
570c0542 1171 free(st);
f9ce90ba
NB
1172 return NULL;
1173}
fe6729fa 1174
beae1dfe
NB
1175/* Return size of device in bytes */
1176int get_dev_size(int fd, char *dname, unsigned long long *sizep)
1177{
1178 unsigned long long ldsize;
c2c9bb6f
NB
1179 struct stat st;
1180
1181 if (fstat(fd, &st) != -1 && S_ISREG(st.st_mode))
1182 ldsize = (unsigned long long)st.st_size;
1183 else
beae1dfe
NB
1184#ifdef BLKGETSIZE64
1185 if (ioctl(fd, BLKGETSIZE64, &ldsize) != 0)
1186#endif
1187 {
1188 unsigned long dsize;
1189 if (ioctl(fd, BLKGETSIZE, &dsize) == 0) {
1190 ldsize = dsize;
1191 ldsize <<= 9;
1192 } else {
1193 if (dname)
e7b84f9d 1194 pr_err("Cannot get size of %s: %s\b",
beae1dfe
NB
1195 dname, strerror(errno));
1196 return 0;
1197 }
1198 }
1199 *sizep = ldsize;
1200 return 1;
1201}
8fac0577 1202
3a371610
N
1203/* Return true if this can only be a container, not a member device.
1204 * i.e. is and md device and size is zero
1205 */
1206int must_be_container(int fd)
1207{
1208 unsigned long long size;
1209 if (md_get_version(fd) < 0)
1210 return 0;
1211 if (get_dev_size(fd, NULL, &size) == 0)
1212 return 1;
1213 if (size == 0)
1214 return 1;
1215 return 0;
1216}
034b203a
TM
1217
1218/* Sets endofpart parameter to the last block used by the last GPT partition on the device.
1219 * Returns: 1 if successful
1220 * -1 for unknown partition type
1221 * 0 for other errors
1222 */
1223static int get_gpt_last_partition_end(int fd, unsigned long long *endofpart)
1224{
056b331e 1225 struct GPT gpt;
034b203a 1226 unsigned char empty_gpt_entry[16]= {0};
db7fdfe4
JS
1227 struct GPT_part_entry *part;
1228 char buf[512];
034b203a
TM
1229 unsigned long long curr_part_end;
1230 unsigned all_partitions, entry_size;
f21e18ca 1231 unsigned part_nr;
034b203a
TM
1232
1233 *endofpart = 0;
1234
056b331e 1235 BUILD_BUG_ON(sizeof(gpt) != 512);
73e658d8 1236 /* skip protective MBR */
034b203a 1237 lseek(fd, 512, SEEK_SET);
73e658d8 1238 /* read GPT header */
056b331e 1239 if (read(fd, &gpt, 512) != 512)
034b203a
TM
1240 return 0;
1241
1242 /* get the number of partition entries and the entry size */
056b331e
N
1243 all_partitions = __le32_to_cpu(gpt.part_cnt);
1244 entry_size = __le32_to_cpu(gpt.part_size);
034b203a
TM
1245
1246 /* Check GPT signature*/
056b331e 1247 if (gpt.magic != GPT_SIGNATURE_MAGIC)
034b203a
TM
1248 return -1;
1249
1250 /* sanity checks */
1251 if (all_partitions > 1024 ||
db7fdfe4 1252 entry_size > sizeof(buf))
034b203a
TM
1253 return -1;
1254
db7fdfe4
JS
1255 part = (struct GPT_part_entry *)buf;
1256
ca3b6696 1257 for (part_nr = 0; part_nr < all_partitions; part_nr++) {
73e658d8 1258 /* read partition entry */
db7fdfe4 1259 if (read(fd, buf, entry_size) != (ssize_t)entry_size)
73e658d8
LB
1260 return 0;
1261
034b203a 1262 /* is this valid partition? */
db7fdfe4 1263 if (memcmp(part->type_guid, empty_gpt_entry, 16) != 0) {
034b203a 1264 /* check the last lba for the current partition */
db7fdfe4 1265 curr_part_end = __le64_to_cpu(part->ending_lba);
034b203a
TM
1266 if (curr_part_end > *endofpart)
1267 *endofpart = curr_part_end;
1268 }
1269
034b203a
TM
1270 }
1271 return 1;
1272}
1273
1274/* Sets endofpart parameter to the last block used by the last partition on the device.
1275 * Returns: 1 if successful
1276 * -1 for unknown partition type
1277 * 0 for other errors
1278 */
1279static int get_last_partition_end(int fd, unsigned long long *endofpart)
1280{
056b331e 1281 struct MBR boot_sect;
034b203a
TM
1282 struct MBR_part_record *part;
1283 unsigned long long curr_part_end;
f21e18ca 1284 unsigned part_nr;
034b203a
TM
1285 int retval = 0;
1286
1287 *endofpart = 0;
1288
056b331e 1289 BUILD_BUG_ON(sizeof(boot_sect) != 512);
034b203a
TM
1290 /* read MBR */
1291 lseek(fd, 0, 0);
056b331e 1292 if (read(fd, &boot_sect, 512) != 512)
034b203a
TM
1293 goto abort;
1294
1295 /* check MBP signature */
056b331e 1296 if (boot_sect.magic == MBR_SIGNATURE_MAGIC) {
034b203a
TM
1297 retval = 1;
1298 /* found the correct signature */
056b331e 1299 part = boot_sect.parts;
034b203a 1300
ca3b6696 1301 for (part_nr = 0; part_nr < MBR_PARTITIONS; part_nr++) {
034b203a
TM
1302 /* check for GPT type */
1303 if (part->part_type == MBR_GPT_PARTITION_TYPE) {
1304 retval = get_gpt_last_partition_end(fd, endofpart);
1305 break;
1306 }
1307 /* check the last used lba for the current partition */
1308 curr_part_end = __le32_to_cpu(part->first_sect_lba) +
1309 __le32_to_cpu(part->blocks_num);
1310 if (curr_part_end > *endofpart)
1311 *endofpart = curr_part_end;
1312
1313 part++;
1314 }
1315 } else {
1316 /* Unknown partition table */
1317 retval = -1;
1318 }
1319 abort:
1320 return retval;
1321}
1322
53ed6ac3
KW
1323int check_partitions(int fd, char *dname, unsigned long long freesize,
1324 unsigned long long size)
034b203a
TM
1325{
1326 /*
1327 * Check where the last partition ends
1328 */
1329 unsigned long long endofpart;
1330 int ret;
1331
1332 if ((ret = get_last_partition_end(fd, &endofpart)) > 0) {
1333 /* There appears to be a partition table here */
1334 if (freesize == 0) {
1335 /* partitions will not be visible in new device */
e7b84f9d
N
1336 pr_err("partition table exists on %s but will be lost or\n"
1337 " meaningless after creating array\n",
1338 dname);
034b203a
TM
1339 return 1;
1340 } else if (endofpart > freesize) {
1341 /* last partition overlaps metadata */
e7b84f9d
N
1342 pr_err("metadata will over-write last partition on %s.\n",
1343 dname);
034b203a 1344 return 1;
53ed6ac3
KW
1345 } else if (size && endofpart > size) {
1346 /* partitions will be truncated in new device */
e7b84f9d
N
1347 pr_err("array size is too small to cover all partitions on %s.\n",
1348 dname);
53ed6ac3 1349 return 1;
034b203a
TM
1350 }
1351 }
1352 return 0;
1353}
1354
a322f70c
DW
1355int open_container(int fd)
1356{
1357 /* 'fd' is a block device. Find out if it is in use
1358 * by a container, and return an open fd on that container.
1359 */
1360 char path[256];
1361 char *e;
1362 DIR *dir;
1363 struct dirent *de;
1364 int dfd, n;
1365 char buf[200];
1366 int major, minor;
1367 struct stat st;
1368
1369 if (fstat(fd, &st) != 0)
1370 return -1;
1371 sprintf(path, "/sys/dev/block/%d:%d/holders",
1372 (int)major(st.st_rdev), (int)minor(st.st_rdev));
1373 e = path + strlen(path);
1374
1375 dir = opendir(path);
1376 if (!dir)
1377 return -1;
1378 while ((de = readdir(dir))) {
1379 if (de->d_ino == 0)
1380 continue;
1381 if (de->d_name[0] == '.')
1382 continue;
a994592d
N
1383 /* Need to make sure it is a container and not a volume */
1384 sprintf(e, "/%s/md/metadata_version", de->d_name);
1385 dfd = open(path, O_RDONLY);
1386 if (dfd < 0)
1387 continue;
1388 n = read(dfd, buf, sizeof(buf));
1389 close(dfd);
1390 if (n <= 0 || (unsigned)n >= sizeof(buf))
1391 continue;
1392 buf[n] = 0;
1393 if (strncmp(buf, "external", 8) != 0 ||
1394 n < 10 ||
1395 buf[9] == '/')
1396 continue;
a322f70c
DW
1397 sprintf(e, "/%s/dev", de->d_name);
1398 dfd = open(path, O_RDONLY);
1399 if (dfd < 0)
1400 continue;
1401 n = read(dfd, buf, sizeof(buf));
1402 close(dfd);
f21e18ca 1403 if (n <= 0 || (unsigned)n >= sizeof(buf))
a322f70c
DW
1404 continue;
1405 buf[n] = 0;
1406 if (sscanf(buf, "%d:%d", &major, &minor) != 2)
1407 continue;
1408 sprintf(buf, "%d:%d", major, minor);
1409 dfd = dev_open(buf, O_RDONLY);
1410 if (dfd >= 0) {
1411 closedir(dir);
1412 return dfd;
1413 }
1414 }
355726fa 1415 closedir(dir);
a322f70c
DW
1416 return -1;
1417}
1418
33414a01
DW
1419struct superswitch *version_to_superswitch(char *vers)
1420{
1421 int i;
1422
1423 for (i = 0; superlist[i]; i++) {
1424 struct superswitch *ss = superlist[i];
1425
1426 if (strcmp(vers, ss->name) == 0)
1427 return ss;
1428 }
1429
1430 return NULL;
1431}
1432
4dd2df09
N
1433int metadata_container_matches(char *metadata, char *devnm)
1434{
1435 /* Check if 'devnm' is the container named in 'metadata'
1436 * which is
1437 * /containername/componentname or
1438 * -containername/componentname
1439 */
1440 int l;
1441 if (*metadata != '/' && *metadata != '-')
1442 return 0;
1443 l = strlen(devnm);
1444 if (strncmp(metadata+1, devnm, l) != 0)
1445 return 0;
1446 if (metadata[l+1] != '/')
1447 return 0;
1448 return 1;
1449}
1450
1451int metadata_subdev_matches(char *metadata, char *devnm)
1452{
1453 /* Check if 'devnm' is the subdev named in 'metadata'
1454 * which is
1455 * /containername/subdev or
1456 * -containername/subdev
1457 */
1458 char *sl;
1459 if (*metadata != '/' && *metadata != '-')
1460 return 0;
1461 sl = strchr(metadata+1, '/');
1462 if (!sl)
1463 return 0;
1464 if (strcmp(sl+1, devnm) == 0)
1465 return 1;
1466 return 0;
1467}
1468
33414a01
DW
1469int is_container_member(struct mdstat_ent *mdstat, char *container)
1470{
1471 if (mdstat->metadata_version == NULL ||
1472 strncmp(mdstat->metadata_version, "external:", 9) != 0 ||
4dd2df09 1473 !metadata_container_matches(mdstat->metadata_version+9, container))
33414a01
DW
1474 return 0;
1475
1476 return 1;
1477}
1478
1479int is_subarray_active(char *subarray, char *container)
1480{
1481 struct mdstat_ent *mdstat = mdstat_read(0, 0);
1482 struct mdstat_ent *ent;
1483
e5408a32
DW
1484 for (ent = mdstat; ent; ent = ent->next)
1485 if (is_container_member(ent, container))
e5e5d7ce 1486 if (strcmp(to_subarray(ent, container), subarray) == 0)
33414a01 1487 break;
33414a01
DW
1488
1489 free_mdstat(mdstat);
1490
1491 return ent != NULL;
1492}
1493
1494/* open_subarray - opens a subarray in a container
1495 * @dev: container device name
feab51f8 1496 * @st: empty supertype
33414a01
DW
1497 * @quiet: block reporting errors flag
1498 *
1499 * On success returns an fd to a container and fills in *st
1500 */
feab51f8 1501int open_subarray(char *dev, char *subarray, struct supertype *st, int quiet)
33414a01
DW
1502{
1503 struct mdinfo *mdi;
a951a4f7 1504 struct mdinfo *info;
33414a01 1505 int fd, err = 1;
4dd2df09 1506 char *_devnm;
33414a01
DW
1507
1508 fd = open(dev, O_RDWR|O_EXCL);
1509 if (fd < 0) {
1510 if (!quiet)
e7b84f9d 1511 pr_err("Couldn't open %s, aborting\n",
33414a01 1512 dev);
b990032d 1513 return -1;
33414a01
DW
1514 }
1515
4dd2df09
N
1516 _devnm = fd2devnm(fd);
1517 if (_devnm == NULL) {
33414a01 1518 if (!quiet)
e7b84f9d
N
1519 pr_err("Failed to determine device number for %s\n",
1520 dev);
33414a01
DW
1521 goto close_fd;
1522 }
4dd2df09 1523 strcpy(st->devnm, _devnm);
33414a01 1524
4dd2df09 1525 mdi = sysfs_read(fd, st->devnm, GET_VERSION|GET_LEVEL);
33414a01
DW
1526 if (!mdi) {
1527 if (!quiet)
e7b84f9d 1528 pr_err("Failed to read sysfs for %s\n",
33414a01
DW
1529 dev);
1530 goto close_fd;
1531 }
1532
1533 if (mdi->array.level != UnSet) {
1534 if (!quiet)
e7b84f9d 1535 pr_err("%s is not a container\n", dev);
33414a01
DW
1536 goto free_sysfs;
1537 }
1538
1539 st->ss = version_to_superswitch(mdi->text_version);
1540 if (!st->ss) {
1541 if (!quiet)
e7b84f9d
N
1542 pr_err("Operation not supported for %s metadata\n",
1543 mdi->text_version);
33414a01
DW
1544 goto free_sysfs;
1545 }
1546
4dd2df09 1547 if (st->devnm[0] == 0) {
33414a01 1548 if (!quiet)
e7b84f9d 1549 pr_err("Failed to allocate device name\n");
33414a01
DW
1550 goto free_sysfs;
1551 }
1552
db20d413 1553 if (!st->ss->load_container) {
33414a01 1554 if (!quiet)
e7b84f9d 1555 pr_err("%s is not a container\n", dev);
4dd2df09 1556 goto free_sysfs;
33414a01
DW
1557 }
1558
db20d413 1559 if (st->ss->load_container(st, fd, NULL)) {
33414a01 1560 if (!quiet)
e7b84f9d 1561 pr_err("Failed to load metadata for %s\n",
db20d413 1562 dev);
4dd2df09 1563 goto free_sysfs;
33414a01
DW
1564 }
1565
a951a4f7
N
1566 info = st->ss->container_content(st, subarray);
1567 if (!info) {
1568 if (!quiet)
e7b84f9d 1569 pr_err("Failed to find subarray-%s in %s\n",
a951a4f7
N
1570 subarray, dev);
1571 goto free_super;
1572 }
1573 free(info);
1574
33414a01
DW
1575 err = 0;
1576
1577 free_super:
1578 if (err)
1579 st->ss->free_super(st);
33414a01
DW
1580 free_sysfs:
1581 sysfs_free(mdi);
1582 close_fd:
1583 if (err)
1584 close(fd);
1585
1586 if (err)
1587 return -1;
1588 else
1589 return fd;
1590}
1591
7801ac20
N
1592int add_disk(int mdfd, struct supertype *st,
1593 struct mdinfo *sra, struct mdinfo *info)
1594{
1595 /* Add a device to an array, in one of 2 ways. */
1596 int rv;
1597#ifndef MDASSEMBLE
1598 if (st->ss->external) {
d23534e4
DW
1599 if (info->disk.state & (1<<MD_DISK_SYNC))
1600 info->recovery_start = MaxSector;
1601 else
1602 info->recovery_start = 0;
2904b26f 1603 rv = sysfs_add_disk(sra, info, 0);
7801ac20
N
1604 if (! rv) {
1605 struct mdinfo *sd2;
f35f2525
N
1606 for (sd2 = sra->devs; sd2; sd2=sd2->next)
1607 if (sd2 == info)
1608 break;
1609 if (sd2 == NULL) {
503975b9 1610 sd2 = xmalloc(sizeof(*sd2));
f35f2525
N
1611 *sd2 = *info;
1612 sd2->next = sra->devs;
1613 sra->devs = sd2;
1614 }
7801ac20
N
1615 }
1616 } else
1617#endif
1618 rv = ioctl(mdfd, ADD_NEW_DISK, &info->disk);
1619 return rv;
1620}
1621
de6ae750
N
1622int remove_disk(int mdfd, struct supertype *st,
1623 struct mdinfo *sra, struct mdinfo *info)
1624{
1625 int rv;
1626 /* Remove the disk given by 'info' from the array */
1627#ifndef MDASSEMBLE
1628 if (st->ss->external)
1629 rv = sysfs_set_str(sra, info, "slot", "none");
1630 else
1631#endif
1632 rv = ioctl(mdfd, HOT_REMOVE_DISK, makedev(info->disk.major,
1633 info->disk.minor));
1634 return rv;
1635}
1636
f35f2525
N
1637int set_array_info(int mdfd, struct supertype *st, struct mdinfo *info)
1638{
1639 /* Initialise kernel's knowledge of array.
1640 * This varies between externally managed arrays
1641 * and older kernels
1642 */
1643 int vers = md_get_version(mdfd);
1644 int rv;
1645
1646#ifndef MDASSEMBLE
1647 if (st->ss->external)
1648 rv = sysfs_set_array(info, vers);
1649 else
1650#endif
1651 if ((vers % 100) >= 1) { /* can use different versions */
1652 mdu_array_info_t inf;
1653 memset(&inf, 0, sizeof(inf));
1654 inf.major_version = info->array.major_version;
1655 inf.minor_version = info->array.minor_version;
1656 rv = ioctl(mdfd, SET_ARRAY_INFO, &inf);
1657 } else
1658 rv = ioctl(mdfd, SET_ARRAY_INFO, NULL);
1659 return rv;
1660}
1661
1e5c6983
DW
1662unsigned long long min_recovery_start(struct mdinfo *array)
1663{
1664 /* find the minimum recovery_start in an array for metadata
1665 * formats that only record per-array recovery progress instead
1666 * of per-device
1667 */
1668 unsigned long long recovery_start = MaxSector;
1669 struct mdinfo *d;
1670
1671 for (d = array->devs; d; d = d->next)
1672 recovery_start = min(recovery_start, d->recovery_start);
1673
1674 return recovery_start;
1675}
1676
4dd2df09 1677int mdmon_pid(char *devnm)
a931db9e
NB
1678{
1679 char path[100];
1680 char pid[10];
1681 int fd;
1682 int n;
10013317 1683
4dd2df09 1684 sprintf(path, "%s/%s.pid", MDMON_DIR, devnm);
10013317 1685
24f6f99b 1686 fd = open(path, O_RDONLY | O_NOATIME, 0);
a931db9e
NB
1687
1688 if (fd < 0)
cf556303 1689 return -1;
a931db9e
NB
1690 n = read(fd, pid, 9);
1691 close(fd);
1692 if (n <= 0)
cf556303 1693 return -1;
24f6f99b 1694 return atoi(pid);
a931db9e
NB
1695}
1696
4dd2df09 1697int mdmon_running(char *devnm)
a931db9e 1698{
4dd2df09 1699 int pid = mdmon_pid(devnm);
24f6f99b 1700 if (pid <= 0)
a931db9e 1701 return 0;
24f6f99b 1702 if (kill(pid, 0) == 0)
a931db9e
NB
1703 return 1;
1704 return 0;
1705}
1706
4dd2df09 1707int start_mdmon(char *devnm)
8850ee3e 1708{
1913c325 1709 int i, skipped;
44d2e365 1710 int len;
ca3b6696 1711 pid_t pid;
9fe32043 1712 int status;
44d2e365
N
1713 char pathbuf[1024];
1714 char *paths[4] = {
1715 pathbuf,
1716 "/sbin/mdmon",
1717 "mdmon",
1718 NULL
1719 };
8850ee3e 1720
40ebbb9c 1721 if (check_env("MDADM_NO_MDMON"))
8850ee3e
N
1722 return 0;
1723
9cf014ec 1724 len = readlink("/proc/self/exe", pathbuf, sizeof(pathbuf)-1);
44d2e365
N
1725 if (len > 0) {
1726 char *sl;
1727 pathbuf[len] = 0;
1728 sl = strrchr(pathbuf, '/');
1729 if (sl)
1730 sl++;
1731 else
1732 sl = pathbuf;
1733 strcpy(sl, "mdmon");
1734 } else
1735 pathbuf[0] = '\0';
1736
0f7bdf89
JS
1737 /* First try to run systemctl */
1738 switch(fork()) {
1739 case 0:
1740 /* FIXME yuk. CLOSE_EXEC?? */
1741 skipped = 0;
1742 for (i = 3; skipped < 20; i++)
1743 if (close(i) < 0)
1744 skipped++;
1745 else
1746 skipped = 0;
1747
701d5b4a
N
1748 /* Don't want to see error messages from systemctl.
1749 * If the service doesn't exist, we start mdmon ourselves.
1750 */
1751 close(2);
1752 open("/dev/null", O_WRONLY);
0f7bdf89 1753 snprintf(pathbuf, sizeof(pathbuf), "mdmon@%s.service",
4dd2df09 1754 devnm);
0f7bdf89
JS
1755 status = execl("/usr/bin/systemctl", "systemctl", "start",
1756 pathbuf, NULL);
1757 status = execl("/bin/systemctl", "systemctl", "start",
1758 pathbuf, NULL);
1759 exit(1);
1760 case -1: pr_err("cannot run mdmon. "
1761 "Array remains readonly\n");
1762 return -1;
1763 default: /* parent - good */
1764 pid = wait(&status);
1765 if (pid >= 0 && status == 0)
1766 return 0;
1767 }
1768
1769 /* That failed, try running mdmon directly */
8850ee3e
N
1770 switch(fork()) {
1771 case 0:
1772 /* FIXME yuk. CLOSE_EXEC?? */
1913c325 1773 skipped = 0;
ca3b6696 1774 for (i = 3; skipped < 20; i++)
1913c325
N
1775 if (close(i) < 0)
1776 skipped++;
1777 else
1778 skipped = 0;
1779
ca3b6696 1780 for (i = 0; paths[i]; i++)
a0963a86 1781 if (paths[i][0]) {
3e23ba9d 1782 execl(paths[i], "mdmon",
4dd2df09 1783 devnm, NULL);
a0963a86 1784 }
8850ee3e 1785 exit(1);
e7b84f9d 1786 case -1: pr_err("cannot run mdmon. "
8850ee3e
N
1787 "Array remains readonly\n");
1788 return -1;
9fe32043
N
1789 default: /* parent - good */
1790 pid = wait(&status);
15c10423
JS
1791 if (pid < 0 || status != 0) {
1792 pr_err("failed to launch mdmon. "
1793 "Array remains readonly\n");
9fe32043 1794 return -1;
15c10423 1795 }
8850ee3e
N
1796 }
1797 return 0;
1798}
1799
148acb7b
DW
1800__u32 random32(void)
1801{
1802 __u32 rv;
1803 int rfd = open("/dev/urandom", O_RDONLY);
1804 if (rfd < 0 || read(rfd, &rv, 4) != 4)
1805 rv = random();
1806 if (rfd >= 0)
1807 close(rfd);
1808 return rv;
1809}
1810
0e600426 1811#ifndef MDASSEMBLE
edd8d13c
NB
1812int flush_metadata_updates(struct supertype *st)
1813{
1814 int sfd;
1815 if (!st->updates) {
1816 st->update_tail = NULL;
1817 return -1;
1818 }
1819
4dd2df09 1820 sfd = connect_monitor(st->container_devnm);
edd8d13c
NB
1821 if (sfd < 0)
1822 return -1;
1823
1824 while (st->updates) {
1825 struct metadata_update *mu = st->updates;
1826 st->updates = mu->next;
1827
1828 send_message(sfd, mu, 0);
1829 wait_reply(sfd, 0);
1830 free(mu->buf);
1831 free(mu);
1832 }
1833 ack(sfd, 0);
1834 wait_reply(sfd, 0);
1835 close(sfd);
1836 st->update_tail = NULL;
1837 return 0;
1838}
1839
1840void append_metadata_update(struct supertype *st, void *buf, int len)
1841{
1842
503975b9 1843 struct metadata_update *mu = xmalloc(sizeof(*mu));
edd8d13c
NB
1844
1845 mu->buf = buf;
1846 mu->len = len;
1847 mu->space = NULL;
cb23f1f4 1848 mu->space_list = NULL;
edd8d13c
NB
1849 mu->next = NULL;
1850 *st->update_tail = mu;
1851 st->update_tail = &mu->next;
1852}
0e600426 1853#endif /* MDASSEMBLE */
a931db9e 1854
fe6729fa
NB
1855#ifdef __TINYC__
1856/* tinyc doesn't optimize this check in ioctl.h out ... */
1857unsigned int __invalid_size_argument_for_IOC = 0;
1858#endif
1859
6d11ec6f
AK
1860int experimental(void)
1861{
1862 if (check_env("MDADM_EXPERIMENTAL"))
1863 return 1;
1864 else {
e7b84f9d 1865 pr_err("To use this feature MDADM_EXPERIMENTAL"
65c83a80 1866 " environment variable has to be defined.\n");
6d11ec6f
AK
1867 return 0;
1868 }
1869}
1870
326727d9
AC
1871/* Pick all spares matching given criteria from a container
1872 * if min_size == 0 do not check size
1873 * if domlist == NULL do not check domains
1874 * if spare_group given add it to domains of each spare
1875 * metadata allows to test domains using metadata of destination array */
1876struct mdinfo *container_choose_spares(struct supertype *st,
1877 unsigned long long min_size,
1878 struct domainlist *domlist,
1879 char *spare_group,
1880 const char *metadata, int get_one)
1881{
1882 struct mdinfo *d, **dp, *disks = NULL;
1883
1884 /* get list of all disks in container */
1885 if (st->ss->getinfo_super_disks)
1886 disks = st->ss->getinfo_super_disks(st);
1887
1888 if (!disks)
1889 return disks;
1890 /* find spare devices on the list */
1891 dp = &disks->devs;
1892 disks->array.spare_disks = 0;
1893 while (*dp) {
1894 int found = 0;
1895 d = *dp;
1896 if (d->disk.state == 0) {
1897 /* check if size is acceptable */
1898 unsigned long long dev_size;
1899 dev_t dev = makedev(d->disk.major,d->disk.minor);
1900
1901 if (!min_size ||
1902 (dev_size_from_id(dev, &dev_size) &&
1903 dev_size >= min_size))
1904 found = 1;
1905 /* check if domain matches */
1906 if (found && domlist) {
4dd2df09 1907 struct dev_policy *pol = devid_policy(dev);
326727d9
AC
1908 if (spare_group)
1909 pol_add(&pol, pol_domain,
1910 spare_group, NULL);
e5508b36 1911 if (domain_test(domlist, pol, metadata) != 1)
326727d9
AC
1912 found = 0;
1913 dev_policy_free(pol);
1914 }
1915 }
1916 if (found) {
1917 dp = &d->next;
1918 disks->array.spare_disks++;
1919 if (get_one) {
1920 sysfs_free(*dp);
1921 d->next = NULL;
1922 }
1923 } else {
1924 *dp = d->next;
1925 d->next = NULL;
1926 sysfs_free(d);
1927 }
1928 }
1929 return disks;
1930}
9eafa1de
MN
1931
1932/* Checks if paths point to the same device
1933 * Returns 0 if they do.
1934 * Returns 1 if they don't.
1935 * Returns -1 if something went wrong,
1936 * e.g. paths are empty or the files
1937 * they point to don't exist */
1938int compare_paths (char* path1, char* path2)
1939{
1940 struct stat st1,st2;
1941
1942 if (path1 == NULL || path2 == NULL)
1943 return -1;
1944 if (stat(path1,&st1) != 0)
1945 return -1;
1946 if (stat(path2,&st2) != 0)
1947 return -1;
1948 if ((st1.st_ino == st2.st_ino) && (st1.st_dev == st2.st_dev))
1949 return 0;
1950 return 1;
1951}
a7dec3fd
N
1952
1953/* Make sure we can open as many devices as needed */
1954void enable_fds(int devices)
1955{
1956 unsigned int fds = 20 + devices;
1957 struct rlimit lim;
1958 if (getrlimit(RLIMIT_NOFILE, &lim) != 0
1959 || lim.rlim_cur >= fds)
1960 return;
1961 if (lim.rlim_max < fds)
1962 lim.rlim_max = fds;
1963 lim.rlim_cur = fds;
1964 setrlimit(RLIMIT_NOFILE, &lim);
1965}