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fix load_super/free_super mismatch in util.c
[thirdparty/mdadm.git] / mdadm.h
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1/*
2 * mdadm - manage Linux "md" devices aka RAID arrays.
3 *
4 * Copyright (C) 2001-2006 Neil Brown <neilb@suse.de>
5 *
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 * Author: Neil Brown
22 * Email: <neilb@cse.unsw.edu.au>
23 * Paper: Neil Brown
24 * School of Computer Science and Engineering
25 * The University of New South Wales
26 * Sydney, 2052
27 * Australia
28 */
29
30#define _GNU_SOURCE
31#define _FILE_OFFSET_BITS 64
32#include <unistd.h>
33#if !defined(__dietlibc__) && !defined(__KLIBC__)
34extern __off64_t lseek64 __P ((int __fd, __off64_t __offset, int __whence));
35#else
36# if defined(__NO_STAT64) || __WORDSIZE != 32
37# define lseek64 lseek
38# endif
39#endif
40
41#include <sys/types.h>
42#include <sys/stat.h>
43#include <stdlib.h>
44#include <time.h>
45#include <sys/time.h>
46#include <getopt.h>
47#include <fcntl.h>
48#include <stdio.h>
49#include <errno.h>
50#include <string.h>
51#include <syslog.h>
52#ifdef __dietlibc__
53#include <strings.h>
54/* dietlibc has deprecated random and srandom!! */
55#define random rand
56#define srandom srand
57#endif
58
59
60#include <linux/kdev_t.h>
61/*#include <linux/fs.h> */
62#include <sys/mount.h>
63#include <asm/types.h>
64#include <sys/ioctl.h>
65#define MD_MAJOR 9
66#define MdpMinorShift 6
67
68#ifndef BLKGETSIZE64
69#define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
70#endif
71
72#define DEFAULT_BITMAP_CHUNK 4096
73#define DEFAULT_BITMAP_DELAY 5
74#define DEFAULT_MAX_WRITE_BEHIND 256
75
76#include "md_u.h"
77#include "md_p.h"
78#include "bitmap.h"
79
80#include <endian.h>
81/* Redhat don't like to #include <asm/byteorder.h>, and
82 * some time include <linux/byteorder/xxx_endian.h> isn't enough,
83 * and there is no standard conversion function so... */
84/* And dietlibc doesn't think byteswap is ok, so.. */
85/* #include <byteswap.h> */
86#define bswap_16(x) (((x) & 0x00ffU) << 8 | \
87 ((x) & 0xff00U) >> 8)
88#define bswap_32(x) (((x) & 0x000000ffU) << 24 | \
89 ((x) & 0xff000000U) >> 24 | \
90 ((x) & 0x0000ff00U) << 8 | \
91 ((x) & 0x00ff0000U) >> 8)
92#define bswap_64(x) (((x) & 0x00000000000000ffULL) << 56 | \
93 ((x) & 0xff00000000000000ULL) >> 56 | \
94 ((x) & 0x000000000000ff00ULL) << 40 | \
95 ((x) & 0x00ff000000000000ULL) >> 40 | \
96 ((x) & 0x0000000000ff0000ULL) << 24 | \
97 ((x) & 0x0000ff0000000000ULL) >> 24 | \
98 ((x) & 0x00000000ff000000ULL) << 8 | \
99 ((x) & 0x000000ff00000000ULL) >> 8)
100
101#if !defined(__KLIBC__)
102#if BYTE_ORDER == LITTLE_ENDIAN
103#define __cpu_to_le16(_x) (_x)
104#define __cpu_to_le32(_x) (_x)
105#define __cpu_to_le64(_x) (_x)
106#define __le16_to_cpu(_x) (_x)
107#define __le32_to_cpu(_x) (_x)
108#define __le64_to_cpu(_x) (_x)
109#elif BYTE_ORDER == BIG_ENDIAN
110#define __cpu_to_le16(_x) bswap_16(_x)
111#define __cpu_to_le32(_x) bswap_32(_x)
112#define __cpu_to_le64(_x) bswap_64(_x)
113#define __le16_to_cpu(_x) bswap_16(_x)
114#define __le32_to_cpu(_x) bswap_32(_x)
115#define __le64_to_cpu(_x) bswap_64(_x)
116#else
117# error "unknown endianness."
118#endif
119#endif /* __KLIBC__ */
120
121
122
123/* general information that might be extracted from a superblock */
124struct mdinfo {
125 mdu_array_info_t array;
126 mdu_disk_info_t disk;
127 __u64 events;
128 int uuid[4];
129 char name[33];
130 unsigned long long data_offset;
131 unsigned long long component_size;
132 int reshape_active;
133 unsigned long long reshape_progress;
134 int new_level, delta_disks, new_layout, new_chunk;
135 int errors;
136 int cache_size; /* size of raid456 stripe cache*/
137 int mismatch_cnt;
138 char text_version[50];
139
140 char sys_name[20];
141 struct mdinfo *devs;
142 struct mdinfo *next;
143};
144
145struct createinfo {
146 int uid;
147 int gid;
148 int autof;
149 int mode;
150 int symlinks;
151 struct supertype *supertype;
152};
153
154#define Name "mdadm"
155
156enum mode {
157 ASSEMBLE=1,
158 BUILD,
159 CREATE,
160 MANAGE,
161 MISC,
162 MONITOR,
163 GROW,
164 INCREMENTAL,
165 AUTODETECT,
166};
167
168extern char short_options[];
169extern char short_bitmap_options[];
170extern char short_bitmap_auto_options[];
171extern struct option long_options[];
172extern char Version[], Usage[], Help[], OptionHelp[],
173 Help_create[], Help_build[], Help_assemble[], Help_grow[],
174 Help_incr[],
175 Help_manage[], Help_misc[], Help_monitor[], Help_config[];
176
177/* for option that don't have short equivilents, we assign arbitrary
178 * small numbers. '1' means an undecorated option, so we start at '2'.
179 */
180enum special_options {
181 AssumeClean = 2,
182 BitmapChunk,
183 WriteBehind,
184 ReAdd,
185 NoDegraded,
186 Sparc22,
187 BackupFile,
188 HomeHost,
189 AutoHomeHost,
190 Symlinks,
191 AutoDetect,
192};
193
194/* structures read from config file */
195/* List of mddevice names and identifiers
196 * Identifiers can be:
197 * uuid=128-hex-uuid
198 * super-minor=decimal-minor-number-from-superblock
199 * devices=comma,separated,list,of,device,names,with,wildcards
200 *
201 * If multiple fields are present, the intersection of all matching
202 * devices is considered
203 */
204#define UnSet (0xfffe)
205typedef struct mddev_ident_s {
206 char *devname;
207
208 int uuid_set;
209 int uuid[4];
210 char name[33];
211
212 unsigned int super_minor;
213
214 char *devices; /* comma separated list of device
215 * names with wild cards
216 */
217 int level;
218 unsigned int raid_disks;
219 unsigned int spare_disks;
220 struct supertype *st;
221 int autof; /* 1 for normal, 2 for partitioned */
222 char *spare_group;
223 char *bitmap_file;
224 int bitmap_fd;
225
226 struct mddev_ident_s *next;
227} *mddev_ident_t;
228
229/* List of device names - wildcards expanded */
230typedef struct mddev_dev_s {
231 char *devname;
232 char disposition; /* 'a' for add, 'r' for remove, 'f' for fail.
233 * Not set for names read from .config
234 */
235 char writemostly;
236 char re_add;
237 char used; /* set when used */
238 struct mddev_dev_s *next;
239} *mddev_dev_t;
240
241typedef struct mapping {
242 char *name;
243 int num;
244} mapping_t;
245
246
247struct mdstat_ent {
248 char *dev;
249 int devnum;
250 int active;
251 char *level;
252 char *pattern; /* U or up, _ for down */
253 int percent; /* -1 if no resync */
254 int resync; /* 1 if resync, 0 if recovery */
255 struct mdstat_ent *next;
256};
257
258extern struct mdstat_ent *mdstat_read(int hold, int start);
259extern void free_mdstat(struct mdstat_ent *ms);
260extern void mdstat_wait(int seconds);
261extern int mddev_busy(int devnum);
262
263struct map_ent {
264 struct map_ent *next;
265 int devnum;
266 int major,minor;
267 int uuid[4];
268 char *path;
269};
270extern int map_update(struct map_ent **mpp, int devnum, int major, int minor,
271 int uuid[4], char *path);
272extern struct map_ent *map_by_uuid(struct map_ent **map, int uuid[4]);
273extern void map_read(struct map_ent **melp);
274extern int map_write(struct map_ent *mel);
275extern void map_delete(struct map_ent **mapp, int devnum);
276extern void map_free(struct map_ent *map);
277extern void map_add(struct map_ent **melp,
278 int devnum, int major, int minor, int uuid[4], char *path);
279
280/* various details can be requested */
281#define GET_LEVEL 1
282#define GET_LAYOUT 2
283#define GET_COMPONENT 4
284#define GET_CHUNK 8
285#define GET_CACHE 16
286#define GET_MISMATCH 32
287#define GET_VERSION 64
288
289#define GET_DEVS 1024 /* gets role, major, minor */
290#define GET_OFFSET 2048
291#define GET_SIZE 4096
292#define GET_STATE 8192
293#define GET_ERROR 16384
294
295/* If fd >= 0, get the array it is open on,
296 * else use devnum. >=0 -> major9. <0.....
297 */
298extern void sysfs_free(struct mdinfo *sra);
299extern struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options);
300extern int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev,
301 char *name, char *val);
302extern int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev,
303 char *name, unsigned long long val);
304extern int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev,
305 char *name, unsigned long long *val);
306
307
308extern int save_stripes(int *source, unsigned long long *offsets,
309 int raid_disks, int chunk_size, int level, int layout,
310 int nwrites, int *dest,
311 unsigned long long start, unsigned long long length);
312extern int restore_stripes(int *dest, unsigned long long *offsets,
313 int raid_disks, int chunk_size, int level, int layout,
314 int source, unsigned long long read_offset,
315 unsigned long long start, unsigned long long length);
316
317#ifndef Sendmail
318#define Sendmail "/usr/lib/sendmail -t"
319#endif
320
321#define SYSLOG_FACILITY LOG_DAEMON
322
323extern char *map_num(mapping_t *map, int num);
324extern int map_name(mapping_t *map, char *name);
325extern mapping_t r5layout[], pers[], modes[], faultylayout[];
326
327extern char *map_dev(int major, int minor, int create);
328
329
330extern struct superswitch {
331 void (*examine_super)(struct supertype *st, char *homehost);
332 void (*brief_examine_super)(struct supertype *st);
333 void (*detail_super)(struct supertype *st, char *homehost);
334 void (*export_super)(struct supertype *st);
335 void (*brief_detail_super)(struct supertype *st);
336 void (*uuid_from_super)(struct supertype *st, int uuid[4]);
337 void (*getinfo_super)(struct supertype *st, struct mdinfo *info);
338 int (*match_home)(struct supertype *st, char *homehost);
339 int (*update_super)(struct supertype *st, struct mdinfo *info,
340 char *update,
341 char *devname, int verbose,
342 int uuid_set, char *homehost);
343 int (*init_super)(struct supertype *st, mdu_array_info_t *info,
344 unsigned long long size, char *name,
345 char *homehost, int *uuid);
346 void (*add_to_super)(struct supertype *st, mdu_disk_info_t *dinfo);
347 int (*store_super)(struct supertype *st, int fd);
348 int (*write_init_super)(struct supertype *st, mdu_disk_info_t *dinfo,
349 char *devname);
350 int (*compare_super)(struct supertype *st, struct supertype *tst);
351 int (*load_super)(struct supertype *st, int fd, char *devname);
352 struct supertype * (*match_metadata_desc)(char *arg);
353 __u64 (*avail_size)(struct supertype *st, __u64 size);
354 int (*add_internal_bitmap)(struct supertype *st, int *chunkp,
355 int delay, int write_behind,
356 unsigned long long size, int may_change, int major);
357 void (*locate_bitmap)(struct supertype *st, int fd);
358 int (*write_bitmap)(struct supertype *st, int fd);
359 void (*free_super)(struct supertype *st);
360 int major;
361 int swapuuid; /* true if uuid is bigending rather than hostendian */
362} super0, super1, *superlist[];
363
364struct supertype {
365 struct superswitch *ss;
366 int minor_version;
367 int max_devs;
368 void *sb;
369};
370
371extern struct supertype *super_by_fd(int fd);
372extern struct supertype *guess_super(int fd);
373extern struct supertype *dup_super(struct supertype *st);
374extern int get_dev_size(int fd, char *dname, unsigned long long *sizep);
375extern void get_one_disk(int mdfd, mdu_array_info_t *ainf,
376 mdu_disk_info_t *disk);
377
378#if __GNUC__ < 3
379struct stat64;
380#endif
381
382#define HAVE_NFTW we assume
383#define HAVE_FTW
384
385#ifdef UCLIBC
386# include <features.h>
387# ifndef __UCLIBC_HAS_FTW__
388# undef HAVE_FTW
389# undef HAVE_NFTW
390# endif
391#endif
392
393#ifdef __dietlibc__
394# undef HAVE_NFTW
395#endif
396
397#if defined(__KLIBC__)
398# undef HAVE_NFTW
399# undef HAVE_FTW
400#endif
401
402#ifndef HAVE_NFTW
403# define FTW_PHYS 1
404# ifndef HAVE_FTW
405 struct FTW {};
406# endif
407#endif
408
409#ifdef HAVE_FTW
410# include <ftw.h>
411#endif
412
413extern int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s);
414
415
416extern int Manage_ro(char *devname, int fd, int readonly);
417extern int Manage_runstop(char *devname, int fd, int runstop, int quiet);
418extern int Manage_resize(char *devname, int fd, long long size, int raid_disks);
419extern int Manage_reconfig(char *devname, int fd, int layout);
420extern int Manage_subdevs(char *devname, int fd,
421 mddev_dev_t devlist, int verbose);
422extern int autodetect(void);
423extern int Grow_Add_device(char *devname, int fd, char *newdev);
424extern int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int write_behind, int force);
425extern int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
426 long long size,
427 int level, int layout, int chunksize, int raid_disks);
428extern int Grow_restart(struct supertype *st, struct mdinfo *info,
429 int *fdlist, int cnt, char *backup_file);
430
431
432extern int Assemble(struct supertype *st, char *mddev, int mdfd,
433 mddev_ident_t ident,
434 mddev_dev_t devlist, char *backup_file,
435 int readonly, int runstop,
436 char *update, char *homehost,
437 int verbose, int force);
438
439extern int Build(char *mddev, int mdfd, int chunk, int level, int layout,
440 int raiddisks,
441 mddev_dev_t devlist, int assume_clean,
442 char *bitmap_file, int bitmap_chunk, int write_behind, int delay, int verbose);
443
444
445extern int Create(struct supertype *st, char *mddev, int mdfd,
446 int chunk, int level, int layout, unsigned long long size, int raiddisks, int sparedisks,
447 char *name, char *homehost, int *uuid,
448 int subdevs, mddev_dev_t devlist,
449 int runstop, int verbose, int force, int assume_clean,
450 char *bitmap_file, int bitmap_chunk, int write_behind, int delay);
451
452extern int Detail(char *dev, int brief, int export, int test, char *homehost);
453extern int Query(char *dev);
454extern int Examine(mddev_dev_t devlist, int brief, int scan, int SparcAdjust,
455 struct supertype *forcest, char *homehost);
456extern int Monitor(mddev_dev_t devlist,
457 char *mailaddr, char *alert_cmd,
458 int period, int daemonise, int scan, int oneshot,
459 int dosyslog, int test, char *pidfile);
460
461extern int Kill(char *dev, int force, int quiet);
462extern int Wait(char *dev);
463
464extern int Incremental(char *devname, int verbose, int runstop,
465 struct supertype *st, char *homehost, int autof);
466extern void RebuildMap(void);
467extern int IncrementalScan(int verbose);
468
469extern int CreateBitmap(char *filename, int force, char uuid[16],
470 unsigned long chunksize, unsigned long daemon_sleep,
471 unsigned long write_behind,
472 unsigned long long array_size,
473 int major);
474extern int ExamineBitmap(char *filename, int brief, struct supertype *st);
475extern int bitmap_update_uuid(int fd, int *uuid, int swap);
476
477extern int md_get_version(int fd);
478extern int get_linux_version(void);
479extern int parse_uuid(char *str, int uuid[4]);
480extern int check_ext2(int fd, char *name);
481extern int check_reiser(int fd, char *name);
482extern int check_raid(int fd, char *name);
483
484extern int get_mdp_major(void);
485extern int dev_open(char *dev, int flags);
486extern int is_standard(char *dev, int *nump);
487
488extern int parse_auto(char *str, char *msg, int config);
489extern mddev_ident_t conf_get_ident(char *dev);
490extern mddev_dev_t conf_get_devs(void);
491extern int conf_test_dev(char *devname);
492extern struct createinfo *conf_get_create_info(void);
493extern void set_conffile(char *file);
494extern char *conf_get_mailaddr(void);
495extern char *conf_get_mailfrom(void);
496extern char *conf_get_program(void);
497extern char *conf_get_homehost(void);
498extern char *conf_line(FILE *file);
499extern char *conf_word(FILE *file, int allow_key);
500extern void free_line(char *line);
501extern int match_oneof(char *devices, char *devname);
502extern void uuid_from_super(int uuid[4], mdp_super_t *super);
503extern int same_uuid(int a[4], int b[4], int swapuuid);
504extern void copy_uuid(void *a, int b[4], int swapuuid);
505extern unsigned long calc_csum(void *super, int bytes);
506extern int enough(int level, int raid_disks, int layout, int clean,
507 char *avail, int avail_disks);
508extern int ask(char *mesg);
509extern unsigned long long get_component_size(int fd);
510extern void remove_partitions(int fd);
511
512
513extern char *human_size(long long bytes);
514char *human_size_brief(long long bytes);
515
516extern void put_md_name(char *name);
517extern char *get_md_name(int dev);
518
519extern char DefaultConfFile[];
520
521extern int open_mddev(char *dev, int autof);
522extern int open_mddev_devnum(char *devname, int devnum, char *name,
523 char *chosen_name);
524
525
526#define LEVEL_MULTIPATH (-4)
527#define LEVEL_LINEAR (-1)
528#define LEVEL_FAULTY (-5)
529
530
531/* faulty stuff */
532
533#define WriteTransient 0
534#define ReadTransient 1
535#define WritePersistent 2
536#define ReadPersistent 3
537#define WriteAll 4 /* doesn't go to device */
538#define ReadFixable 5
539#define Modes 6
540
541#define ClearErrors 31
542#define ClearFaults 30
543
544#define AllPersist 100 /* internal use only */
545#define NoPersist 101
546
547#define ModeMask 0x1f
548#define ModeShift 5
549
550
551#ifdef __TINYC__
552#undef minor
553#undef major
554#undef makedev
555#define minor(x) ((x)&0xff)
556#define major(x) (((x)>>8)&0xff)
557#define makedev(M,m) (((M)<<8) | (m))
558#endif
559
560/* for raid5 */
561#define ALGORITHM_LEFT_ASYMMETRIC 0
562#define ALGORITHM_RIGHT_ASYMMETRIC 1
563#define ALGORITHM_LEFT_SYMMETRIC 2
564#define ALGORITHM_RIGHT_SYMMETRIC 3
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