Assemble/Incr : minor tidy up of setting 'trustworthy'.
[thirdparty/mdadm.git] / util.c
CommitLineData
64c4757e 1/*
9a9dab36 2 * mdadm - manage Linux "md" devices aka RAID arrays.
64c4757e 3 *
4f589ad0 4 * Copyright (C) 2001-2006 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
22 * Email: <neilb@cse.unsw.edu.au>
23 * Paper: Neil Brown
24 * School of Computer Science and Engineering
25 * The University of New South Wales
26 * Sydney, 2052
27 * Australia
28 */
29
9a9dab36 30#include "mdadm.h"
64c4757e 31#include "md_p.h"
edd8d13c 32#include <sys/socket.h>
64c4757e 33#include <sys/utsname.h>
9fe32043 34#include <sys/wait.h>
edd8d13c 35#include <sys/un.h>
98c6faba 36#include <ctype.h>
a322f70c 37#include <dirent.h>
a931db9e 38#include <signal.h>
0a816ef9
NB
39
40/*
41 * following taken from linux/blkpg.h because they aren't
42 * anywhere else and it isn't safe to #include linux/ * stuff.
43 */
44
45#define BLKPG _IO(0x12,105)
46
47/* The argument structure */
48struct blkpg_ioctl_arg {
49 int op;
50 int flags;
51 int datalen;
52 void *data;
53};
54
55/* The subfunctions (for the op field) */
56#define BLKPG_ADD_PARTITION 1
57#define BLKPG_DEL_PARTITION 2
58
59/* Sizes of name fields. Unused at present. */
60#define BLKPG_DEVNAMELTH 64
61#define BLKPG_VOLNAMELTH 64
62
63/* The data structure for ADD_PARTITION and DEL_PARTITION */
64struct blkpg_partition {
65 long long start; /* starting offset in bytes */
66 long long length; /* length in bytes */
67 int pno; /* partition number */
68 char devname[BLKPG_DEVNAMELTH]; /* partition name, like sda5 or c0d1p2,
69 to be used in kernel messages */
70 char volname[BLKPG_VOLNAMELTH]; /* volume label */
71};
64c4757e
NB
72
73/*
74 * Parse a 128 bit uuid in 4 integers
75 * format is 32 hexx nibbles with options :.<space> separator
76 * If not exactly 32 hex digits are found, return 0
77 * else return 1
78 */
79int parse_uuid(char *str, int uuid[4])
80{
aba69144
NB
81 int hit = 0; /* number of Hex digIT */
82 int i;
83 char c;
84 for (i=0; i<4; i++) uuid[i]=0;
85
86 while ((c= *str++)) {
87 int n;
88 if (c>='0' && c<='9')
89 n = c-'0';
90 else if (c>='a' && c <= 'f')
91 n = 10 + c - 'a';
92 else if (c>='A' && c <= 'F')
93 n = 10 + c - 'A';
94 else if (strchr(":. -", c))
95 continue;
96 else return 0;
97
98 if (hit<32) {
99 uuid[hit/8] <<= 4;
100 uuid[hit/8] += n;
101 }
102 hit++;
82b27616 103 }
aba69144
NB
104 if (hit == 32)
105 return 1;
106 return 0;
64c4757e
NB
107}
108
109
110/*
111 * Get the md version number.
112 * We use the RAID_VERSION ioctl if it is supported
113 * If not, but we have a block device with major '9', we assume
114 * 0.36.0
115 *
116 * Return version number as 24 but number - assume version parts
117 * always < 255
118 */
119
120int md_get_version(int fd)
121{
122 struct stat stb;
123 mdu_version_t vers;
124
125 if (fstat(fd, &stb)<0)
126 return -1;
127 if ((S_IFMT&stb.st_mode) != S_IFBLK)
128 return -1;
129
130 if (ioctl(fd, RAID_VERSION, &vers) == 0)
682c7051 131 return (vers.major*10000) + (vers.minor*100) + vers.patchlevel;
5787fa49
NB
132 if (errno == EACCES)
133 return -1;
0df46c2a 134 if (major(stb.st_rdev) == MD_MAJOR)
682c7051 135 return (3600);
64c4757e
NB
136 return -1;
137}
138
64c4757e
NB
139int get_linux_version()
140{
141 struct utsname name;
98c6faba 142 char *cp;
64c4757e
NB
143 int a,b,c;
144 if (uname(&name) <0)
145 return -1;
146
98c6faba
NB
147 cp = name.release;
148 a = strtoul(cp, &cp, 10);
149 if (*cp != '.') return -1;
150 b = strtoul(cp+1, &cp, 10);
151 if (*cp != '.') return -1;
152 c = strtoul(cp+1, NULL, 10);
153
682c7051 154 return (a*1000000)+(b*1000)+c;
64c4757e
NB
155}
156
0430ed48
NB
157void remove_partitions(int fd)
158{
159 /* remove partitions from this block devices.
160 * This is used for components added to an array
161 */
162#ifdef BLKPG_DEL_PARTITION
163 struct blkpg_ioctl_arg a;
164 struct blkpg_partition p;
165
166 a.op = BLKPG_DEL_PARTITION;
167 a.data = (void*)&p;
168 a.datalen = sizeof(p);
169 a.flags = 0;
170 memset(a.data, 0, a.datalen);
171 for (p.pno=0; p.pno < 16; p.pno++)
172 ioctl(fd, BLKPG, &a);
173#endif
174}
175
583315d9 176int enough(int level, int raid_disks, int layout, int clean,
265e0f17 177 char *avail, int avail_disks)
64c4757e 178{
265e0f17 179 int copies, first;
64c4757e 180 switch (level) {
265e0f17
NB
181 case 10:
182 /* This is the tricky one - we need to check
183 * which actual disks are present.
184 */
702b557b 185 copies = (layout&255)* ((layout>>8) & 255);
265e0f17
NB
186 first=0;
187 do {
188 /* there must be one of the 'copies' form 'first' */
189 int n = copies;
190 int cnt=0;
191 while (n--) {
192 if (avail[first])
193 cnt++;
194 first = (first+1) % raid_disks;
195 }
196 if (cnt == 0)
197 return 0;
198
199 } while (first != 0);
200 return 1;
e5329c37 201
e0d19036
NB
202 case -4:
203 return avail_disks>= 1;
64c4757e
NB
204 case -1:
205 case 0:
206 return avail_disks == raid_disks;
207 case 1:
208 return avail_disks >= 1;
209 case 4:
210 case 5:
583315d9
NB
211 if (clean)
212 return avail_disks >= raid_disks-1;
213 else
214 return avail_disks >= raid_disks;
98c6faba 215 case 6:
583315d9
NB
216 if (clean)
217 return avail_disks >= raid_disks-2;
218 else
219 return avail_disks >= raid_disks;
64c4757e
NB
220 default:
221 return 0;
222 }
223}
224
36ba7d48 225const int uuid_match_any[4] = { ~0, ~0, ~0, ~0 };
f277ce36 226int same_uuid(int a[4], int b[4], int swapuuid)
64c4757e 227{
36ba7d48
DW
228 if (memcmp(a, uuid_match_any, sizeof(int[4])) == 0 ||
229 memcmp(b, uuid_match_any, sizeof(int[4])) == 0)
230 return 1;
231
f277ce36
NB
232 if (swapuuid) {
233 /* parse uuids are hostendian.
234 * uuid's from some superblocks are big-ending
aba69144 235 * if there is a difference, we need to swap..
f277ce36
NB
236 */
237 unsigned char *ac = (unsigned char *)a;
238 unsigned char *bc = (unsigned char *)b;
239 int i;
240 for (i=0; i<16; i+= 4) {
241 if (ac[i+0] != bc[i+3] ||
242 ac[i+1] != bc[i+2] ||
243 ac[i+2] != bc[i+1] ||
244 ac[i+3] != bc[i+0])
245 return 0;
246 }
247 return 1;
248 } else {
249 if (a[0]==b[0] &&
250 a[1]==b[1] &&
251 a[2]==b[2] &&
252 a[3]==b[3])
253 return 1;
254 return 0;
255 }
64c4757e 256}
350f29f9
NB
257void copy_uuid(void *a, int b[4], int swapuuid)
258{
259 if (swapuuid) {
260 /* parse uuids are hostendian.
261 * uuid's from some superblocks are big-ending
262 * if there is a difference, we need to swap..
263 */
264 unsigned char *ac = (unsigned char *)a;
265 unsigned char *bc = (unsigned char *)b;
266 int i;
267 for (i=0; i<16; i+= 4) {
268 ac[i+0] = bc[i+3];
269 ac[i+1] = bc[i+2];
270 ac[i+2] = bc[i+1];
271 ac[i+3] = bc[i+0];
272 }
273 } else
274 memcpy(a, b, 16);
275}
64c4757e 276
ff54de6e 277char *fname_from_uuid(struct supertype *st, struct mdinfo *info, char *buf, char sep)
d7288ddc 278{
9968e376
DW
279 int i, j;
280 int id;
d7288ddc
N
281 char uuid[16];
282 char *c = buf;
283 strcpy(c, "UUID-");
284 c += strlen(c);
285 copy_uuid(uuid, info->uuid, st->ss->swapuuid);
9968e376
DW
286 for (i = 0; i < 4; i++) {
287 id = uuid[i];
288 if (i)
ff54de6e 289 *c++ = sep;
9968e376
DW
290 for (j = 3; j >= 0; j--) {
291 sprintf(c,"%02x", (unsigned char) uuid[j+4*i]);
292 c+= 2;
293 }
d7288ddc
N
294 }
295 return buf;
296}
297
435d4ebb 298#ifndef MDASSEMBLE
682c7051
NB
299int check_ext2(int fd, char *name)
300{
301 /*
302 * Check for an ext2fs file system.
303 * Superblock is always 1K at 1K offset
304 *
305 * s_magic is le16 at 56 == 0xEF53
306 * report mtime - le32 at 44
307 * blocks - le32 at 4
308 * logblksize - le32 at 24
309 */
310 unsigned char sb[1024];
311 time_t mtime;
312 int size, bsize;
313 if (lseek(fd, 1024,0)!= 1024)
314 return 0;
315 if (read(fd, sb, 1024)!= 1024)
316 return 0;
317 if (sb[56] != 0x53 || sb[57] != 0xef)
318 return 0;
319
320 mtime = sb[44]|(sb[45]|(sb[46]|sb[47]<<8)<<8)<<8;
321 bsize = sb[24]|(sb[25]|(sb[26]|sb[27]<<8)<<8)<<8;
322 size = sb[4]|(sb[5]|(sb[6]|sb[7]<<8)<<8)<<8;
323 fprintf(stderr, Name ": %s appears to contain an ext2fs file system\n",
324 name);
325 fprintf(stderr," size=%dK mtime=%s",
326 size*(1<<bsize), ctime(&mtime));
327 return 1;
328}
329
330int check_reiser(int fd, char *name)
331{
332 /*
333 * superblock is at 64K
334 * size is 1024;
335 * Magic string "ReIsErFs" or "ReIsEr2Fs" at 52
336 *
337 */
338 unsigned char sb[1024];
881990a2 339 unsigned long size;
682c7051
NB
340 if (lseek(fd, 64*1024, 0) != 64*1024)
341 return 0;
342 if (read(fd, sb, 1024) != 1024)
343 return 0;
a46f4061
NB
344 if (strncmp((char*)sb+52, "ReIsErFs",8)!=0 &&
345 strncmp((char*)sb+52, "ReIsEr2Fs",9)!=0)
682c7051
NB
346 return 0;
347 fprintf(stderr, Name ": %s appears to contain a reiserfs file system\n",name);
348 size = sb[0]|(sb[1]|(sb[2]|sb[3]<<8)<<8)<<8;
881990a2 349 fprintf(stderr, " size = %luK\n", size*4);
aba69144 350
682c7051
NB
351 return 1;
352}
353
354int check_raid(int fd, char *name)
355{
4b1ac34b 356 struct mdinfo info;
682c7051 357 time_t crtime;
d078d77c 358 char *level;
82d9eba6 359 struct supertype *st = guess_super(fd);
f9ce90ba 360
82d9eba6 361 if (!st) return 0;
3da92f27 362 st->ss->load_super(st, fd, name);
82d9eba6
NB
363 /* Looks like a raid array .. */
364 fprintf(stderr, Name ": %s appears to be part of a raid array:\n",
365 name);
3da92f27
NB
366 st->ss->getinfo_super(st, &info);
367 st->ss->free_super(st);
82d9eba6 368 crtime = info.array.ctime;
d078d77c
NB
369 level = map_num(pers, info.array.level);
370 if (!level) level = "-unknown-";
371 fprintf(stderr, " level=%s devices=%d ctime=%s",
372 level, info.array.raid_disks, ctime(&crtime));
82d9eba6 373 return 1;
682c7051
NB
374}
375
682c7051
NB
376int ask(char *mesg)
377{
378 char *add = "";
379 int i;
380 for (i=0; i<5; i++) {
381 char buf[100];
382 fprintf(stderr, "%s%s", mesg, add);
383 fflush(stderr);
384 if (fgets(buf, 100, stdin)==NULL)
385 return 0;
386 if (buf[0]=='y' || buf[0]=='Y')
387 return 1;
388 if (buf[0]=='n' || buf[0]=='N')
389 return 0;
390 add = "(y/n) ";
391 }
392 fprintf(stderr, Name ": assuming 'no'\n");
393 return 0;
394}
435d4ebb 395#endif /* MDASSEMBLE */
682c7051
NB
396
397char *map_num(mapping_t *map, int num)
398{
399 while (map->name) {
400 if (map->num == num)
401 return map->name;
402 map++;
403 }
404 return NULL;
405}
406
407int map_name(mapping_t *map, char *name)
408{
409 while (map->name) {
410 if (strcmp(map->name, name)==0)
411 return map->num;
412 map++;
413 }
98c6faba 414 return UnSet;
682c7051 415}
82b27616 416
e5329c37 417
8d80900b 418int is_standard(char *dev, int *nump)
e5329c37
NB
419{
420 /* tests if dev is a "standard" md dev name.
421 * i.e if the last component is "/dNN" or "/mdNN",
aba69144 422 * where NN is a string of digits
598f0d58
NB
423 * Returns 1 if a partitionable standard,
424 * -1 if non-partitonable,
425 * 0 if not a standard name.
e5329c37 426 */
8d80900b
NB
427 char *d = strrchr(dev, '/');
428 int type=0;
429 int num;
430 if (!d)
e5329c37 431 return 0;
8d80900b
NB
432 if (strncmp(d, "/d",2)==0)
433 d += 2, type=1; /* /dev/md/dN{pM} */
434 else if (strncmp(d, "/md_d", 5)==0)
2b4ca8f0 435 d += 5, type=1; /* /dev/md_dN{pM} */
8d80900b
NB
436 else if (strncmp(d, "/md", 3)==0)
437 d += 3, type=-1; /* /dev/mdN */
438 else if (d-dev > 3 && strncmp(d-2, "md/", 3)==0)
5a6d1148 439 d += 1, type=-1; /* /dev/md/N */
e5329c37
NB
440 else
441 return 0;
8d80900b 442 if (!*d)
e5329c37 443 return 0;
8d80900b
NB
444 num = atoi(d);
445 while (isdigit(*d))
446 d++;
447 if (*d)
e5329c37 448 return 0;
8d80900b
NB
449 if (nump) *nump = num;
450
451 return type;
e5329c37
NB
452}
453
454
82b27616
NB
455/*
456 * convert a major/minor pair for a block device into a name in /dev, if possible.
457 * On the first call, walk /dev collecting name.
458 * Put them in a simple linked listfor now.
459 */
460struct devmap {
461 int major, minor;
462 char *name;
463 struct devmap *next;
464} *devlist = NULL;
465int devlist_ready = 0;
466
82b27616
NB
467int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s)
468{
bed256c2 469 struct stat st;
bf68e9d9 470
bed256c2 471 if (S_ISLNK(stb->st_mode)) {
bf68e9d9
DW
472 if (stat(name, &st) != 0)
473 return 0;
bed256c2 474 stb = &st;
82b27616 475 }
bed256c2
NB
476
477 if ((stb->st_mode&S_IFMT)== S_IFBLK) {
478 char *n = strdup(name);
479 struct devmap *dm = malloc(sizeof(*dm));
480 if (strncmp(n, "/dev/./", 7)==0)
481 strcpy(n+4, name+6);
482 if (dm) {
483 dm->major = major(stb->st_rdev);
484 dm->minor = minor(stb->st_rdev);
485 dm->name = n;
486 dm->next = devlist;
487 devlist = dm;
488 }
489 }
490 return 0;
82b27616
NB
491}
492
45e878bb
NB
493#ifndef HAVE_NFTW
494#ifdef HAVE_FTW
495int add_dev_1(const char *name, const struct stat *stb, int flag)
496{
497 return add_dev(name, stb, flag, NULL);
498}
499int nftw(const char *path, int (*han)(const char *name, const struct stat *stb, int flag, struct FTW *s), int nopenfd, int flags)
500{
501 return ftw(path, add_dev_1, nopenfd);
502}
503#else
45e878bb
NB
504int nftw(const char *path, int (*han)(const char *name, const struct stat *stb, int flag, struct FTW *s), int nopenfd, int flags)
505{
506 return 0;
507}
508#endif /* HAVE_FTW */
509#endif /* HAVE_NFTW */
510
dd0781e5
NB
511/*
512 * Find a block device with the right major/minor number.
b79713f8
NB
513 * If we find multiple names, choose the shortest.
514 * If we find a non-standard name, it is probably there
515 * deliberately so prefer it over a standard name.
516 * This applies only to names for MD devices.
dd0781e5 517 */
16c6fa80 518char *map_dev(int major, int minor, int create)
82b27616 519{
dd0781e5 520 struct devmap *p;
b79713f8 521 char *std = NULL, *nonstd=NULL;
e7bb5d23 522 int did_check = 0;
eed35d66 523
e81cdd9f 524 if (major == 0 && minor == 0)
eed35d66 525 return NULL;
e81cdd9f 526
e7bb5d23 527 retry:
dd0781e5 528 if (!devlist_ready) {
0a416ec3
NB
529 char *dev = "/dev";
530 struct stat stb;
eed35d66
NB
531 while(devlist) {
532 struct devmap *d = devlist;
533 devlist = d->next;
534 free(d->name);
535 free(d);
536 }
0a416ec3
NB
537 if (lstat(dev, &stb)==0 &&
538 S_ISLNK(stb.st_mode))
539 dev = "/dev/.";
540 nftw(dev, add_dev, 10, FTW_PHYS);
dd0781e5 541 devlist_ready=1;
e7bb5d23 542 did_check = 1;
dd0781e5 543 }
82b27616 544
dd0781e5
NB
545 for (p=devlist; p; p=p->next)
546 if (p->major == major &&
547 p->minor == minor) {
b79713f8
NB
548 if (is_standard(p->name, NULL)) {
549 if (std == NULL ||
550 strlen(p->name) < strlen(std))
551 std = p->name;
552 } else {
553 if (nonstd == NULL ||
554 strlen(p->name) < strlen(nonstd))
555 nonstd = p->name;
556 }
dd0781e5 557 }
e7bb5d23
NB
558 if (!std && !nonstd && !did_check) {
559 devlist_ready = 0;
560 goto retry;
561 }
16c6fa80
NB
562 if (create && !std && !nonstd) {
563 static char buf[30];
382245c3 564 snprintf(buf, sizeof(buf), "%d:%d", major, minor);
16c6fa80
NB
565 nonstd = buf;
566 }
567
b79713f8 568 return nonstd ? nonstd : std;
82b27616
NB
569}
570
4b1ac34b 571unsigned long calc_csum(void *super, int bytes)
82b27616 572{
56eb10c0 573 unsigned long long newcsum = 0;
82b27616 574 int i;
4b1ac34b
NB
575 unsigned int csum;
576 unsigned int *superc = (unsigned int*) super;
82b27616 577
4b1ac34b 578 for(i=0; i<bytes/4; i++)
82b27616
NB
579 newcsum+= superc[i];
580 csum = (newcsum& 0xffffffff) + (newcsum>>32);
570c0542 581#ifdef __alpha__
aba69144 582/* The in-kernel checksum calculation is always 16bit on
570c0542
NB
583 * the alpha, though it is 32 bit on i386...
584 * I wonder what it is elsewhere... (it uses and API in
585 * a way that it shouldn't).
586 */
587 csum = (csum & 0xffff) + (csum >> 16);
588 csum = (csum & 0xffff) + (csum >> 16);
589#endif
82b27616
NB
590 return csum;
591}
cd29a5c8 592
435d4ebb 593#ifndef MDASSEMBLE
56eb10c0 594char *human_size(long long bytes)
cd29a5c8
NB
595{
596 static char buf[30];
d5d3721e
NB
597
598 /* We convert bytes to either centi-M{ega,ibi}bytes or
599 * centi-G{igi,ibi}bytes, with appropriate rounding,
600 * and then print 1/100th of those as a decimal.
601 * We allow upto 2048Megabytes before converting to
602 * gigabytes, as that shows more precision and isn't
603 * too large a number.
604 * Terrabytes are not yet handled.
605 */
cd29a5c8 606
56eb10c0 607 if (bytes < 5000*1024)
cd29a5c8 608 buf[0]=0;
d5d3721e
NB
609 else if (bytes < 2*1024LL*1024LL*1024LL) {
610 long cMiB = (bytes / ( (1LL<<20) / 200LL ) +1) /2;
611 long cMB = (bytes / ( 1000000LL / 200LL ) +1) /2;
8f23b0b3 612 snprintf(buf, sizeof(buf), " (%ld.%02ld MiB %ld.%02ld MB)",
d5d3721e
NB
613 cMiB/100 , cMiB % 100,
614 cMB/100, cMB % 100);
615 } else {
616 long cGiB = (bytes / ( (1LL<<30) / 200LL ) +1) /2;
617 long cGB = (bytes / (1000000000LL/200LL ) +1) /2;
8f23b0b3 618 snprintf(buf, sizeof(buf), " (%ld.%02ld GiB %ld.%02ld GB)",
d5d3721e
NB
619 cGiB/100 , cGiB % 100,
620 cGB/100, cGB % 100);
621 }
cd29a5c8
NB
622 return buf;
623}
e0d19036
NB
624
625char *human_size_brief(long long bytes)
626{
627 static char buf[30];
e0d19036
NB
628
629 if (bytes < 5000*1024)
8f23b0b3 630 snprintf(buf, sizeof(buf), "%ld.%02ldKiB",
bd526cee 631 (long)(bytes>>10), (long)(((bytes&1023)*100+512)/1024)
e0d19036
NB
632 );
633 else if (bytes < 2*1024LL*1024LL*1024LL)
8f23b0b3 634 snprintf(buf, sizeof(buf), "%ld.%02ldMiB",
e0d19036 635 (long)(bytes>>20),
bd526cee 636 (long)((bytes&0xfffff)+0x100000/200)/(0x100000/100)
e0d19036
NB
637 );
638 else
8f23b0b3 639 snprintf(buf, sizeof(buf), "%ld.%02ldGiB",
e0d19036 640 (long)(bytes>>30),
bd526cee 641 (long)(((bytes>>10)&0xfffff)+0x100000/200)/(0x100000/100)
e0d19036
NB
642 );
643 return buf;
644}
e4965ef8
N
645
646void print_r10_layout(int layout)
647{
648 int near = layout & 255;
649 int far = (layout >> 8) & 255;
650 int offset = (layout&0x10000);
651 char *sep = "";
652
653 if (near != 1) {
654 printf("%s near=%d", sep, near);
655 sep = ",";
656 }
657 if (far != 1)
658 printf("%s %s=%d", sep, offset?"offset":"far", far);
659 if (near*far == 1)
660 printf("NO REDUNDANCY");
661}
435d4ebb 662#endif
e0d19036 663
5f8097be
NB
664unsigned long long calc_array_size(int level, int raid_disks, int layout,
665 int chunksize, unsigned long long devsize)
666{
667 int data_disks = 0;
668 switch (level) {
669 case 0: data_disks = raid_disks; break;
670 case 1: data_disks = 1; break;
671 case 4:
672 case 5: data_disks = raid_disks - 1; break;
673 case 6: data_disks = raid_disks - 2; break;
674 case 10: data_disks = raid_disks / (layout & 255) / ((layout>>8)&255);
675 break;
676 }
677 devsize &= ~(unsigned long long)((chunksize>>9)-1);
678 return data_disks * devsize;
679}
680
dd0781e5 681int get_mdp_major(void)
98c6faba 682{
dd0781e5
NB
683static int mdp_major = -1;
684 FILE *fl;
98c6faba
NB
685 char *w;
686 int have_block = 0;
687 int have_devices = 0;
688 int last_num = -1;
dd0781e5
NB
689
690 if (mdp_major != -1)
691 return mdp_major;
692 fl = fopen("/proc/devices", "r");
98c6faba 693 if (!fl)
dd0781e5 694 return -1;
98c6faba
NB
695 while ((w = conf_word(fl, 1))) {
696 if (have_block && strcmp(w, "devices:")==0)
697 have_devices = 1;
698 have_block = (strcmp(w, "Block")==0);
699 if (isdigit(w[0]))
700 last_num = atoi(w);
701 if (have_devices && strcmp(w, "mdp")==0)
702 mdp_major = last_num;
703 free(w);
704 }
705 fclose(fl);
dd0781e5 706 return mdp_major;
98c6faba
NB
707}
708
0e600426 709#if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO)
e0d19036
NB
710char *get_md_name(int dev)
711{
712 /* find /dev/md%d or /dev/md/%d or make a device /dev/.tmp.md%d */
98c6faba 713 /* if dev < 0, want /dev/md/d%d or find mdp in /proc/devices ... */
e0d19036
NB
714 static char devname[50];
715 struct stat stb;
98c6faba 716 dev_t rdev;
dd0781e5 717 char *dn;
98c6faba
NB
718
719 if (dev < 0) {
dd0781e5
NB
720 int mdp = get_mdp_major();
721 if (mdp < 0) return NULL;
0df46c2a 722 rdev = makedev(mdp, (-1-dev)<<6);
8f23b0b3 723 snprintf(devname, sizeof(devname), "/dev/md/d%d", -1-dev);
98c6faba
NB
724 if (stat(devname, &stb) == 0
725 && (S_IFMT&stb.st_mode) == S_IFBLK
726 && (stb.st_rdev == rdev))
727 return devname;
728 } else {
0df46c2a 729 rdev = makedev(MD_MAJOR, dev);
8f23b0b3 730 snprintf(devname, sizeof(devname), "/dev/md%d", dev);
98c6faba
NB
731 if (stat(devname, &stb) == 0
732 && (S_IFMT&stb.st_mode) == S_IFBLK
733 && (stb.st_rdev == rdev))
734 return devname;
735
8f23b0b3 736 snprintf(devname, sizeof(devname), "/dev/md/%d", dev);
98c6faba
NB
737 if (stat(devname, &stb) == 0
738 && (S_IFMT&stb.st_mode) == S_IFBLK
739 && (stb.st_rdev == rdev))
740 return devname;
741 }
16c6fa80 742 dn = map_dev(major(rdev), minor(rdev), 0);
dd0781e5
NB
743 if (dn)
744 return dn;
8f23b0b3 745 snprintf(devname, sizeof(devname), "/dev/.tmp.md%d", dev);
e0d19036 746 if (mknod(devname, S_IFBLK | 0600, rdev) == -1)
dd0781e5
NB
747 if (errno != EEXIST)
748 return NULL;
e0d19036
NB
749
750 if (stat(devname, &stb) == 0
751 && (S_IFMT&stb.st_mode) == S_IFBLK
752 && (stb.st_rdev == rdev))
753 return devname;
754 unlink(devname);
755 return NULL;
756}
757
758void put_md_name(char *name)
759{
760 if (strncmp(name, "/dev/.tmp.md", 12)==0)
761 unlink(name);
762}
ea24acd0 763
ea24acd0
NB
764int find_free_devnum(int use_partitions)
765{
766 int devnum;
767 for (devnum = 127; devnum != 128;
a56fb7ec 768 devnum = devnum ? devnum-1 : (1<<20)-1) {
ea24acd0
NB
769 char *dn;
770 int _devnum;
771
772 _devnum = use_partitions ? (-1-devnum) : devnum;
773 if (mddev_busy(_devnum))
774 continue;
775 /* make sure it is new to /dev too, at least as a
776 * non-standard */
777 dn = map_dev(dev2major(_devnum), dev2minor(_devnum), 0);
778 if (dn && ! is_standard(dn, NULL))
779 continue;
780 break;
781 }
782 if (devnum == 128)
783 return NoMdDev;
784 return use_partitions ? (-1-devnum) : devnum;
785}
435d4ebb 786#endif /* !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) */
f9ce90ba 787
8b0dabea
NB
788int dev_open(char *dev, int flags)
789{
790 /* like 'open', but if 'dev' matches %d:%d, create a temp
791 * block device and open that
792 */
793 char *e;
794 int fd = -1;
795 char devname[32];
e81cdd9f 796 int major;
8b0dabea 797 int minor;
e81cdd9f
NB
798
799 if (!dev) return -1;
800
801 major = strtoul(dev, &e, 0);
8b0dabea
NB
802 if (e > dev && *e == ':' && e[1] &&
803 (minor = strtoul(e+1, &e, 0)) >= 0 &&
804 *e == 0) {
8c210183
NB
805 snprintf(devname, sizeof(devname), "/dev/.tmp.md.%d:%d:%d",
806 (int)getpid(), major, minor);
8b0dabea 807 if (mknod(devname, S_IFBLK|0600, makedev(major, minor))==0) {
6416d527 808 fd = open(devname, flags|O_DIRECT);
8b0dabea
NB
809 unlink(devname);
810 }
811 } else
6416d527 812 fd = open(dev, flags|O_DIRECT);
8b0dabea
NB
813 return fd;
814}
f9ce90ba 815
e8a70c89
N
816int open_dev(int devnum)
817{
818 char buf[20];
819
820 sprintf(buf, "%d:%d", dev2major(devnum), dev2minor(devnum));
821 return dev_open(buf, O_RDWR);
822}
823
a931db9e
NB
824int open_dev_excl(int devnum)
825{
826 char buf[20];
827 int i;
828
829 sprintf(buf, "%d:%d", dev2major(devnum), dev2minor(devnum));
830 for (i=0 ; i<25 ; i++) {
831 int fd = dev_open(buf, O_RDWR|O_EXCL);
832 if (fd >= 0)
833 return fd;
834 if (errno != EBUSY)
835 return fd;
836 usleep(200000);
837 }
838 return -1;
839}
840
9008ed1c
N
841int same_dev(char *one, char *two)
842{
843 struct stat st1, st2;
844 if (stat(one, &st1) != 0)
845 return 0;
846 if (stat(two, &st2) != 0)
847 return 0;
848 if ((st1.st_mode & S_IFMT) != S_IFBLK)
849 return 0;
850 if ((st2.st_mode & S_IFMT) != S_IFBLK)
851 return 0;
852 return st1.st_rdev == st2.st_rdev;
853}
854
a7c6e3fb 855void wait_for(char *dev, int fd)
a714580e
N
856{
857 int i;
a7c6e3fb
N
858 struct stat stb_want;
859
860 if (fstat(fd, &stb_want) != 0 ||
861 (stb_want.st_mode & S_IFMT) != S_IFBLK)
862 return;
a714580e
N
863
864 for (i=0 ; i<25 ; i++) {
865 struct stat stb;
a7c6e3fb
N
866 if (stat(dev, &stb) == 0 &&
867 (stb.st_mode & S_IFMT) == S_IFBLK &&
868 (stb.st_rdev == stb_want.st_rdev))
a714580e
N
869 return;
870 usleep(200000);
871 }
872}
873
cdddbdbc 874struct superswitch *superlist[] = { &super0, &super1, &super_ddf, &super_imsm, NULL };
f9ce90ba 875
ea24acd0 876#if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO)
f7dd881f 877
1686dc25 878struct supertype *super_by_fd(int fd)
f9ce90ba 879{
1686dc25
NB
880 mdu_array_info_t array;
881 int vers;
882 int minor;
883 struct supertype *st = NULL;
7e0f6979 884 struct mdinfo *sra;
142cb9e1 885 char *verstr;
1686dc25
NB
886 char version[20];
887 int i;
f7e7067b 888 char *subarray = NULL;
1686dc25
NB
889
890 sra = sysfs_read(fd, 0, GET_VERSION);
891
892 if (sra) {
7e0f6979
NB
893 vers = sra->array.major_version;
894 minor = sra->array.minor_version;
142cb9e1 895 verstr = sra->text_version;
1686dc25
NB
896 } else {
897 if (ioctl(fd, GET_ARRAY_INFO, &array))
898 array.major_version = array.minor_version = 0;
899 vers = array.major_version;
900 minor = array.minor_version;
142cb9e1 901 verstr = "";
6fbba4c9 902 }
82d9eba6 903
1686dc25
NB
904 if (vers != -1) {
905 sprintf(version, "%d.%d", vers, minor);
906 verstr = version;
6fbba4c9 907 }
3c558363 908 if (minor == -2 && is_subarray(verstr)) {
f7e7067b
NB
909 char *dev = verstr+1;
910 subarray = strchr(dev, '/');
911 int devnum;
912 if (subarray)
913 *subarray++ = '\0';
77472ff8 914 devnum = devname2devnum(dev);
f7e7067b
NB
915 subarray = strdup(subarray);
916 if (sra)
917 sysfs_free(sra);
918 sra = sysfs_read(-1, devnum, GET_VERSION);
919 verstr = sra->text_version ? : "-no-metadata-";
920 }
921
922 for (i = 0; st == NULL && superlist[i] ; i++)
923 st = superlist[i]->match_metadata_desc(verstr);
1686dc25
NB
924
925 if (sra)
926 sysfs_free(sra);
f7e7067b 927 if (st) {
3b0896f8 928 st->sb = NULL;
f7e7067b
NB
929 if (subarray) {
930 strncpy(st->subarray, subarray, 32);
931 st->subarray[31] = 0;
932 free(subarray);
933 } else
934 st->subarray[0] = 0;
935 }
82d9eba6 936 return st;
f9ce90ba 937}
ea24acd0
NB
938#endif /* !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) */
939
f9ce90ba 940
159c3a1a 941struct supertype *dup_super(struct supertype *orig)
3da92f27 942{
159c3a1a 943 struct supertype *st;
1686dc25 944
d2ca6449
NB
945 if (!orig)
946 return orig;
159c3a1a 947 st = malloc(sizeof(*st));
3da92f27
NB
948 if (!st)
949 return st;
ef609477 950 memset(st, 0, sizeof(*st));
159c3a1a
NB
951 st->ss = orig->ss;
952 st->max_devs = orig->max_devs;
953 st->minor_version = orig->minor_version;
f7e7067b 954 strcpy(st->subarray, orig->subarray);
159c3a1a
NB
955 st->sb = NULL;
956 st->info = NULL;
957 return st;
3da92f27
NB
958}
959
82d9eba6 960struct supertype *guess_super(int fd)
f9ce90ba
NB
961{
962 /* try each load_super to find the best match,
963 * and return the best superswitch
964 */
82d9eba6
NB
965 struct superswitch *ss;
966 struct supertype *st;
570c0542
NB
967 unsigned long besttime = 0;
968 int bestsuper = -1;
f9ce90ba
NB
969 int i;
970
82d9eba6 971 st = malloc(sizeof(*st));
f9ce90ba
NB
972 for (i=0 ; superlist[i]; i++) {
973 int rv;
974 ss = superlist[i];
ef609477 975 memset(st, 0, sizeof(*st));
3da92f27 976 rv = ss->load_super(st, fd, NULL);
570c0542
NB
977 if (rv == 0) {
978 struct mdinfo info;
3da92f27 979 st->ss->getinfo_super(st, &info);
570c0542
NB
980 if (bestsuper == -1 ||
981 besttime < info.array.ctime) {
982 bestsuper = i;
983 besttime = info.array.ctime;
570c0542 984 }
3da92f27 985 ss->free_super(st);
570c0542
NB
986 }
987 }
988 if (bestsuper != -1) {
989 int rv;
ef609477 990 memset(st, 0, sizeof(*st));
3da92f27 991 rv = superlist[bestsuper]->load_super(st, fd, NULL);
f9ce90ba 992 if (rv == 0) {
5e747af2 993 superlist[bestsuper]->free_super(st);
82d9eba6 994 return st;
f9ce90ba
NB
995 }
996 }
570c0542 997 free(st);
f9ce90ba
NB
998 return NULL;
999}
fe6729fa 1000
beae1dfe
NB
1001/* Return size of device in bytes */
1002int get_dev_size(int fd, char *dname, unsigned long long *sizep)
1003{
1004 unsigned long long ldsize;
c2c9bb6f
NB
1005 struct stat st;
1006
1007 if (fstat(fd, &st) != -1 && S_ISREG(st.st_mode))
1008 ldsize = (unsigned long long)st.st_size;
1009 else
beae1dfe
NB
1010#ifdef BLKGETSIZE64
1011 if (ioctl(fd, BLKGETSIZE64, &ldsize) != 0)
1012#endif
1013 {
1014 unsigned long dsize;
1015 if (ioctl(fd, BLKGETSIZE, &dsize) == 0) {
1016 ldsize = dsize;
1017 ldsize <<= 9;
1018 } else {
1019 if (dname)
1020 fprintf(stderr, Name ": Cannot get size of %s: %s\b",
1021 dname, strerror(errno));
1022 return 0;
1023 }
1024 }
1025 *sizep = ldsize;
1026 return 1;
1027}
8fac0577 1028
8382f19b
NB
1029void get_one_disk(int mdfd, mdu_array_info_t *ainf, mdu_disk_info_t *disk)
1030{
1031 int d;
1032 ioctl(mdfd, GET_ARRAY_INFO, ainf);
1033 for (d = 0 ; d < ainf->raid_disks + ainf->nr_disks ; d++)
1034 if (ioctl(mdfd, GET_DISK_INFO, disk) == 0)
1035 return;
1036}
63152c1b 1037
a322f70c
DW
1038int open_container(int fd)
1039{
1040 /* 'fd' is a block device. Find out if it is in use
1041 * by a container, and return an open fd on that container.
1042 */
1043 char path[256];
1044 char *e;
1045 DIR *dir;
1046 struct dirent *de;
1047 int dfd, n;
1048 char buf[200];
1049 int major, minor;
1050 struct stat st;
1051
1052 if (fstat(fd, &st) != 0)
1053 return -1;
1054 sprintf(path, "/sys/dev/block/%d:%d/holders",
1055 (int)major(st.st_rdev), (int)minor(st.st_rdev));
1056 e = path + strlen(path);
1057
1058 dir = opendir(path);
1059 if (!dir)
1060 return -1;
1061 while ((de = readdir(dir))) {
1062 if (de->d_ino == 0)
1063 continue;
1064 if (de->d_name[0] == '.')
1065 continue;
1066 sprintf(e, "/%s/dev", de->d_name);
1067 dfd = open(path, O_RDONLY);
1068 if (dfd < 0)
1069 continue;
1070 n = read(dfd, buf, sizeof(buf));
1071 close(dfd);
1072 if (n <= 0 || n >= sizeof(buf))
1073 continue;
1074 buf[n] = 0;
1075 if (sscanf(buf, "%d:%d", &major, &minor) != 2)
1076 continue;
1077 sprintf(buf, "%d:%d", major, minor);
1078 dfd = dev_open(buf, O_RDONLY);
1079 if (dfd >= 0) {
1080 closedir(dir);
1081 return dfd;
1082 }
1083 }
355726fa 1084 closedir(dir);
a322f70c
DW
1085 return -1;
1086}
1087
7801ac20
N
1088int add_disk(int mdfd, struct supertype *st,
1089 struct mdinfo *sra, struct mdinfo *info)
1090{
1091 /* Add a device to an array, in one of 2 ways. */
1092 int rv;
1093#ifndef MDASSEMBLE
1094 if (st->ss->external) {
462906cd
N
1095 rv = sysfs_add_disk(sra, info,
1096 info->disk.state & (1<<MD_DISK_SYNC));
7801ac20
N
1097 if (! rv) {
1098 struct mdinfo *sd2;
f35f2525
N
1099 for (sd2 = sra->devs; sd2; sd2=sd2->next)
1100 if (sd2 == info)
1101 break;
1102 if (sd2 == NULL) {
1103 sd2 = malloc(sizeof(*sd2));
1104 *sd2 = *info;
1105 sd2->next = sra->devs;
1106 sra->devs = sd2;
1107 }
7801ac20
N
1108 }
1109 } else
1110#endif
1111 rv = ioctl(mdfd, ADD_NEW_DISK, &info->disk);
1112 return rv;
1113}
1114
f35f2525
N
1115int set_array_info(int mdfd, struct supertype *st, struct mdinfo *info)
1116{
1117 /* Initialise kernel's knowledge of array.
1118 * This varies between externally managed arrays
1119 * and older kernels
1120 */
1121 int vers = md_get_version(mdfd);
1122 int rv;
1123
1124#ifndef MDASSEMBLE
1125 if (st->ss->external)
1126 rv = sysfs_set_array(info, vers);
1127 else
1128#endif
1129 if ((vers % 100) >= 1) { /* can use different versions */
1130 mdu_array_info_t inf;
1131 memset(&inf, 0, sizeof(inf));
1132 inf.major_version = info->array.major_version;
1133 inf.minor_version = info->array.minor_version;
1134 rv = ioctl(mdfd, SET_ARRAY_INFO, &inf);
1135 } else
1136 rv = ioctl(mdfd, SET_ARRAY_INFO, NULL);
1137 return rv;
1138}
1139
2f6079dc
NB
1140char *devnum2devname(int num)
1141{
1142 char name[100];
1143 if (num > 0)
1144 sprintf(name, "md%d", num);
1145 else
1146 sprintf(name, "md_d%d", -1-num);
1147 return strdup(name);
1148}
1149
77472ff8
NB
1150int devname2devnum(char *name)
1151{
1152 char *ep;
1153 int num;
1154 if (strncmp(name, "md_d", 4)==0)
1155 num = -1-strtoul(name+4, &ep, 10);
1156 else
1157 num = strtoul(name+2, &ep, 10);
1158 return num;
1159}
1160
c94709e8 1161int stat2devnum(struct stat *st)
2f6079dc 1162{
d7ab966b
N
1163 char path[30];
1164 char link[200];
1165 char *cp;
1166 int n;
1167
c94709e8
DW
1168 if ((S_IFMT & st->st_mode) == S_IFBLK) {
1169 if (major(st->st_rdev) == MD_MAJOR)
1170 return minor(st->st_rdev);
d7ab966b
N
1171 else if (major(st->st_rdev) == get_mdp_major())
1172 return -1- (minor(st->st_rdev)>>MdpMinorShift);
1173
1174 /* must be an extended-minor partition. Look at the
1175 * /sys/dev/block/%d:%d link which must look like
1176 * ../../block/mdXXX/mdXXXpYY
1177 */
1178 sprintf(path, "/sys/dev/block/%d:%d", major(st->st_rdev),
1179 minor(st->st_rdev));
1180 n = readlink(path, link, sizeof(link)-1);
1181 if (n <= 0)
1182 return NoMdDev;
1183 link[n] = 0;
1184 cp = strrchr(link, '/');
1185 if (cp) *cp = 0;
1186 cp = strchr(link, '/');
1187 if (cp && strncmp(cp, "/md", 3) == 0)
1188 return devname2devnum(cp+1);
2f6079dc 1189 }
d7ab966b 1190 return NoMdDev;
c94709e8
DW
1191
1192}
1193
1194int fd2devnum(int fd)
1195{
1196 struct stat stb;
1197 if (fstat(fd, &stb) == 0)
1198 return stat2devnum(&stb);
d7ab966b 1199 return NoMdDev;
2f6079dc
NB
1200}
1201
a931db9e
NB
1202int mdmon_running(int devnum)
1203{
1204 char path[100];
1205 char pid[10];
1206 int fd;
1207 int n;
1208 sprintf(path, "/var/run/mdadm/%s.pid", devnum2devname(devnum));
1209 fd = open(path, O_RDONLY, 0);
1210
1211 if (fd < 0)
1212 return 0;
1213 n = read(fd, pid, 9);
1214 close(fd);
1215 if (n <= 0)
1216 return 0;
1217 if (kill(atoi(pid), 0) == 0)
1218 return 1;
1219 return 0;
1220}
1221
1222int signal_mdmon(int devnum)
1223{
1224 char path[100];
1225 char pid[10];
1226 int fd;
1227 int n;
1228 sprintf(path, "/var/run/mdadm/%s.pid", devnum2devname(devnum));
1229 fd = open(path, O_RDONLY, 0);
1230
1231 if (fd < 0)
1232 return 0;
1233 n = read(fd, pid, 9);
1234 close(fd);
1235 if (n <= 0)
1236 return 0;
1237 if (kill(atoi(pid), SIGUSR1) == 0)
1238 return 1;
1239 return 0;
1240}
1241
8850ee3e
N
1242int start_mdmon(int devnum)
1243{
1244 int i;
44d2e365 1245 int len;
9fe32043
N
1246 pid_t pid;
1247 int status;
44d2e365
N
1248 char pathbuf[1024];
1249 char *paths[4] = {
1250 pathbuf,
1251 "/sbin/mdmon",
1252 "mdmon",
1253 NULL
1254 };
8850ee3e 1255
40ebbb9c 1256 if (check_env("MDADM_NO_MDMON"))
8850ee3e
N
1257 return 0;
1258
44d2e365
N
1259 len = readlink("/proc/self/exe", pathbuf, sizeof(pathbuf));
1260 if (len > 0) {
1261 char *sl;
1262 pathbuf[len] = 0;
1263 sl = strrchr(pathbuf, '/');
1264 if (sl)
1265 sl++;
1266 else
1267 sl = pathbuf;
1268 strcpy(sl, "mdmon");
1269 } else
1270 pathbuf[0] = '\0';
1271
8850ee3e
N
1272 switch(fork()) {
1273 case 0:
1274 /* FIXME yuk. CLOSE_EXEC?? */
1275 for (i=3; i < 100; i++)
1276 close(i);
44d2e365
N
1277 for (i=0; paths[i]; i++)
1278 if (paths[i][0])
1279 execl(paths[i], "mdmon",
e8a70c89
N
1280 devnum2devname(devnum),
1281 NULL);
8850ee3e
N
1282 exit(1);
1283 case -1: fprintf(stderr, Name ": cannot run mdmon. "
1284 "Array remains readonly\n");
1285 return -1;
9fe32043
N
1286 default: /* parent - good */
1287 pid = wait(&status);
1288 if (pid < 0 || status != 0)
1289 return -1;
8850ee3e
N
1290 }
1291 return 0;
1292}
1293
40ebbb9c 1294int check_env(char *name)
5dcfcb71 1295{
40ebbb9c 1296 char *val = getenv(name);
5dcfcb71
DW
1297
1298 if (val && atoi(val) == 1)
1299 return 1;
1300
1301 return 0;
1302}
1303
0e600426 1304#ifndef MDASSEMBLE
edd8d13c
NB
1305int flush_metadata_updates(struct supertype *st)
1306{
1307 int sfd;
1308 if (!st->updates) {
1309 st->update_tail = NULL;
1310 return -1;
1311 }
1312
1313 sfd = connect_monitor(devnum2devname(st->container_dev));
1314 if (sfd < 0)
1315 return -1;
1316
1317 while (st->updates) {
1318 struct metadata_update *mu = st->updates;
1319 st->updates = mu->next;
1320
1321 send_message(sfd, mu, 0);
1322 wait_reply(sfd, 0);
1323 free(mu->buf);
1324 free(mu);
1325 }
1326 ack(sfd, 0);
1327 wait_reply(sfd, 0);
1328 close(sfd);
1329 st->update_tail = NULL;
1330 return 0;
1331}
1332
1333void append_metadata_update(struct supertype *st, void *buf, int len)
1334{
1335
1336 struct metadata_update *mu = malloc(sizeof(*mu));
1337
1338 mu->buf = buf;
1339 mu->len = len;
1340 mu->space = NULL;
1341 mu->next = NULL;
1342 *st->update_tail = mu;
1343 st->update_tail = &mu->next;
1344}
0e600426 1345#endif /* MDASSEMBLE */
a931db9e 1346
fe6729fa
NB
1347#ifdef __TINYC__
1348/* tinyc doesn't optimize this check in ioctl.h out ... */
1349unsigned int __invalid_size_argument_for_IOC = 0;
1350#endif
1351