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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
110#define __cpu_to_be16(_x) bswap_16(_x)
111#define __cpu_to_be32(_x) bswap_32(_x)
112#define __cpu_to_be64(_x) bswap_64(_x)
113#define __be16_to_cpu(_x) bswap_16(_x)
114#define __be32_to_cpu(_x) bswap_32(_x)
115#define __be64_to_cpu(_x) bswap_64(_x)
116#elif BYTE_ORDER == BIG_ENDIAN
117#define __cpu_to_le16(_x) bswap_16(_x)
118#define __cpu_to_le32(_x) bswap_32(_x)
119#define __cpu_to_le64(_x) bswap_64(_x)
120#define __le16_to_cpu(_x) bswap_16(_x)
121#define __le32_to_cpu(_x) bswap_32(_x)
122#define __le64_to_cpu(_x) bswap_64(_x)
123
124#define __cpu_to_be16(_x) (_x)
125#define __cpu_to_be32(_x) (_x)
126#define __cpu_to_be64(_x) (_x)
127#define __be16_to_cpu(_x) (_x)
128#define __be32_to_cpu(_x) (_x)
129#define __be64_to_cpu(_x) (_x)
130#else
131# error "unknown endianness."
132#endif
133#endif /* __KLIBC__ */
134
135
136
137/* general information that might be extracted from a superblock */
138struct mdinfo {
139 mdu_array_info_t array;
140 mdu_disk_info_t disk;
141 __u64 events;
142 int uuid[4];
143 char name[33];
144 unsigned long long data_offset;
145 unsigned long long component_size;
146 int reshape_active;
147 unsigned long long reshape_progress;
148 int new_level, delta_disks, new_layout, new_chunk;
149 int errors;
150 int cache_size; /* size of raid456 stripe cache*/
151 int mismatch_cnt;
152 char text_version[50];
153
154 char sys_name[20];
155 struct mdinfo *devs;
156 struct mdinfo *next;
157};
158
159struct createinfo {
160 int uid;
161 int gid;
162 int autof;
163 int mode;
164 int symlinks;
165 struct supertype *supertype;
166};
167
168#define Name "mdadm"
169
170enum mode {
171 ASSEMBLE=1,
172 BUILD,
173 CREATE,
174 MANAGE,
175 MISC,
176 MONITOR,
177 GROW,
178 INCREMENTAL,
179 AUTODETECT,
180};
181
182extern char short_options[];
183extern char short_bitmap_options[];
184extern char short_bitmap_auto_options[];
185extern struct option long_options[];
186extern char Version[], Usage[], Help[], OptionHelp[],
187 Help_create[], Help_build[], Help_assemble[], Help_grow[],
188 Help_incr[],
189 Help_manage[], Help_misc[], Help_monitor[], Help_config[];
190
191/* for option that don't have short equivilents, we assign arbitrary
192 * small numbers. '1' means an undecorated option, so we start at '2'.
193 */
194enum special_options {
195 AssumeClean = 2,
196 BitmapChunk,
197 WriteBehind,
198 ReAdd,
199 NoDegraded,
200 Sparc22,
201 BackupFile,
202 HomeHost,
203 AutoHomeHost,
204 Symlinks,
205 AutoDetect,
206};
207
208/* structures read from config file */
209/* List of mddevice names and identifiers
210 * Identifiers can be:
211 * uuid=128-hex-uuid
212 * super-minor=decimal-minor-number-from-superblock
213 * devices=comma,separated,list,of,device,names,with,wildcards
214 *
215 * If multiple fields are present, the intersection of all matching
216 * devices is considered
217 */
218#define UnSet (0xfffe)
219typedef struct mddev_ident_s {
220 char *devname;
221
222 int uuid_set;
223 int uuid[4];
224 char name[33];
225
226 unsigned int super_minor;
227
228 char *devices; /* comma separated list of device
229 * names with wild cards
230 */
231 int level;
232 unsigned int raid_disks;
233 unsigned int spare_disks;
234 struct supertype *st;
235 int autof; /* 1 for normal, 2 for partitioned */
236 char *spare_group;
237 char *bitmap_file;
238 int bitmap_fd;
239
240 struct mddev_ident_s *next;
241} *mddev_ident_t;
242
243/* List of device names - wildcards expanded */
244typedef struct mddev_dev_s {
245 char *devname;
246 char disposition; /* 'a' for add, 'r' for remove, 'f' for fail.
247 * Not set for names read from .config
248 */
249 char writemostly;
250 char re_add;
251 char used; /* set when used */
252 struct mddev_dev_s *next;
253} *mddev_dev_t;
254
255typedef struct mapping {
256 char *name;
257 int num;
258} mapping_t;
259
260
261struct mdstat_ent {
262 char *dev;
263 int devnum;
264 int active;
265 char *level;
266 char *pattern; /* U or up, _ for down */
267 int percent; /* -1 if no resync */
268 int resync; /* 1 if resync, 0 if recovery */
269 struct mdstat_ent *next;
270};
271
272extern struct mdstat_ent *mdstat_read(int hold, int start);
273extern void free_mdstat(struct mdstat_ent *ms);
274extern void mdstat_wait(int seconds);
275extern int mddev_busy(int devnum);
276
277struct map_ent {
278 struct map_ent *next;
279 int devnum;
280 int major,minor;
281 int uuid[4];
282 char *path;
283};
284extern int map_update(struct map_ent **mpp, int devnum, int major, int minor,
285 int uuid[4], char *path);
286extern struct map_ent *map_by_uuid(struct map_ent **map, int uuid[4]);
287extern void map_read(struct map_ent **melp);
288extern int map_write(struct map_ent *mel);
289extern void map_delete(struct map_ent **mapp, int devnum);
290extern void map_free(struct map_ent *map);
291extern void map_add(struct map_ent **melp,
292 int devnum, int major, int minor, int uuid[4], char *path);
293
294/* various details can be requested */
295#define GET_LEVEL 1
296#define GET_LAYOUT 2
297#define GET_COMPONENT 4
298#define GET_CHUNK 8
299#define GET_CACHE 16
300#define GET_MISMATCH 32
301#define GET_VERSION 64
302
303#define GET_DEVS 1024 /* gets role, major, minor */
304#define GET_OFFSET 2048
305#define GET_SIZE 4096
306#define GET_STATE 8192
307#define GET_ERROR 16384
308
309/* If fd >= 0, get the array it is open on,
310 * else use devnum. >=0 -> major9. <0.....
311 */
312extern void sysfs_free(struct mdinfo *sra);
313extern struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options);
314extern int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev,
315 char *name, char *val);
316extern int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev,
317 char *name, unsigned long long val);
318extern int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev,
319 char *name, unsigned long long *val);
320extern int sysfs_set_array(struct mdinfo *sra,
321 struct mdinfo *array);
322extern int sysfs_add_disk(struct mdinfo *sra, int fd, struct mdinfo *sd);
323
324
325
326
327extern int save_stripes(int *source, unsigned long long *offsets,
328 int raid_disks, int chunk_size, int level, int layout,
329 int nwrites, int *dest,
330 unsigned long long start, unsigned long long length);
331extern int restore_stripes(int *dest, unsigned long long *offsets,
332 int raid_disks, int chunk_size, int level, int layout,
333 int source, unsigned long long read_offset,
334 unsigned long long start, unsigned long long length);
335
336#ifndef Sendmail
337#define Sendmail "/usr/lib/sendmail -t"
338#endif
339
340#define SYSLOG_FACILITY LOG_DAEMON
341
342extern char *map_num(mapping_t *map, int num);
343extern int map_name(mapping_t *map, char *name);
344extern mapping_t r5layout[], pers[], modes[], faultylayout[];
345
346extern char *map_dev(int major, int minor, int create);
347
348
349extern struct superswitch {
350 void (*examine_super)(struct supertype *st, char *homehost);
351 void (*brief_examine_super)(struct supertype *st);
352 void (*export_examine_super)(struct supertype *st);
353 void (*detail_super)(struct supertype *st, char *homehost);
354 void (*brief_detail_super)(struct supertype *st);
355 void (*export_detail_super)(struct supertype *st);
356 void (*uuid_from_super)(struct supertype *st, int uuid[4]);
357 void (*getinfo_super)(struct supertype *st, struct mdinfo *info);
358 int (*match_home)(struct supertype *st, char *homehost);
359 int (*update_super)(struct supertype *st, struct mdinfo *info,
360 char *update,
361 char *devname, int verbose,
362 int uuid_set, char *homehost);
363 int (*init_super)(struct supertype *st, mdu_array_info_t *info,
364 unsigned long long size, char *name,
365 char *homehost, int *uuid);
366 void (*add_to_super)(struct supertype *st, mdu_disk_info_t *dinfo,
367 int fd, char *devname);
368 int (*store_super)(struct supertype *st, int fd);
369 int (*write_init_super)(struct supertype *st);
370 int (*compare_super)(struct supertype *st, struct supertype *tst);
371 int (*load_super)(struct supertype *st, int fd, char *devname);
372 struct supertype * (*match_metadata_desc)(char *arg);
373 __u64 (*avail_size)(struct supertype *st, __u64 size);
374 int (*add_internal_bitmap)(struct supertype *st, int *chunkp,
375 int delay, int write_behind,
376 unsigned long long size, int may_change, int major);
377 void (*locate_bitmap)(struct supertype *st, int fd);
378 int (*write_bitmap)(struct supertype *st, int fd);
379 void (*free_super)(struct supertype *st);
380 int (*validate_geometry)(struct supertype *st, int level, int layout,
381 int raiddisks,
382 int chunk, unsigned long long size,
383 char *subdev, unsigned long long *freesize);
384 int major;
385 char *text_version;
386 int swapuuid; /* true if uuid is bigending rather than hostendian */
387 int external;
388} super0, super1, super_ddf, super_ddf_bvd, super_ddf_svd, *superlist[];
389
390struct supertype {
391 struct superswitch *ss;
392 int minor_version;
393 int max_devs;
394 void *sb;
395 void *info;
396};
397
398extern struct supertype *super_by_fd(int fd);
399extern struct supertype *guess_super(int fd);
400extern struct supertype *dup_super(struct supertype *st);
401extern int get_dev_size(int fd, char *dname, unsigned long long *sizep);
402extern void get_one_disk(int mdfd, mdu_array_info_t *ainf,
403 mdu_disk_info_t *disk);
404
405#if __GNUC__ < 3
406struct stat64;
407#endif
408
409#define HAVE_NFTW we assume
410#define HAVE_FTW
411
412#ifdef UCLIBC
413# include <features.h>
414# ifndef __UCLIBC_HAS_FTW__
415# undef HAVE_FTW
416# undef HAVE_NFTW
417# endif
418#endif
419
420#ifdef __dietlibc__
421# undef HAVE_NFTW
422#endif
423
424#if defined(__KLIBC__)
425# undef HAVE_NFTW
426# undef HAVE_FTW
427#endif
428
429#ifndef HAVE_NFTW
430# define FTW_PHYS 1
431# ifndef HAVE_FTW
432 struct FTW {};
433# endif
434#endif
435
436#ifdef HAVE_FTW
437# include <ftw.h>
438#endif
439
440extern int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s);
441
442
443extern int Manage_ro(char *devname, int fd, int readonly);
444extern int Manage_runstop(char *devname, int fd, int runstop, int quiet);
445extern int Manage_resize(char *devname, int fd, long long size, int raid_disks);
446extern int Manage_reconfig(char *devname, int fd, int layout);
447extern int Manage_subdevs(char *devname, int fd,
448 mddev_dev_t devlist, int verbose);
449extern int autodetect(void);
450extern int Grow_Add_device(char *devname, int fd, char *newdev);
451extern int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int write_behind, int force);
452extern int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
453 long long size,
454 int level, int layout, int chunksize, int raid_disks);
455extern int Grow_restart(struct supertype *st, struct mdinfo *info,
456 int *fdlist, int cnt, char *backup_file);
457
458
459extern int Assemble(struct supertype *st, char *mddev, int mdfd,
460 mddev_ident_t ident,
461 mddev_dev_t devlist, char *backup_file,
462 int readonly, int runstop,
463 char *update, char *homehost,
464 int verbose, int force);
465
466extern int Build(char *mddev, int mdfd, int chunk, int level, int layout,
467 int raiddisks,
468 mddev_dev_t devlist, int assume_clean,
469 char *bitmap_file, int bitmap_chunk, int write_behind, int delay, int verbose);
470
471
472extern int Create(struct supertype *st, char *mddev, int mdfd,
473 int chunk, int level, int layout, unsigned long long size, int raiddisks, int sparedisks,
474 char *name, char *homehost, int *uuid,
475 int subdevs, mddev_dev_t devlist,
476 int runstop, int verbose, int force, int assume_clean,
477 char *bitmap_file, int bitmap_chunk, int write_behind, int delay);
478
479extern int Detail(char *dev, int brief, int export, int test, char *homehost);
480extern int Query(char *dev);
481extern int Examine(mddev_dev_t devlist, int brief, int export, int scan,
482 int SparcAdjust, struct supertype *forcest, char *homehost);
483extern int Monitor(mddev_dev_t devlist,
484 char *mailaddr, char *alert_cmd,
485 int period, int daemonise, int scan, int oneshot,
486 int dosyslog, int test, char *pidfile);
487
488extern int Kill(char *dev, int force, int quiet, int noexcl);
489extern int Wait(char *dev);
490
491extern int Incremental(char *devname, int verbose, int runstop,
492 struct supertype *st, char *homehost, int autof);
493extern void RebuildMap(void);
494extern int IncrementalScan(int verbose);
495
496extern int CreateBitmap(char *filename, int force, char uuid[16],
497 unsigned long chunksize, unsigned long daemon_sleep,
498 unsigned long write_behind,
499 unsigned long long array_size,
500 int major);
501extern int ExamineBitmap(char *filename, int brief, struct supertype *st);
502extern int bitmap_update_uuid(int fd, int *uuid, int swap);
503
504extern int md_get_version(int fd);
505extern int get_linux_version(void);
506extern int parse_uuid(char *str, int uuid[4]);
507extern int check_ext2(int fd, char *name);
508extern int check_reiser(int fd, char *name);
509extern int check_raid(int fd, char *name);
510
511extern int get_mdp_major(void);
512extern int dev_open(char *dev, int flags);
513extern int is_standard(char *dev, int *nump);
514
515extern int parse_auto(char *str, char *msg, int config);
516extern mddev_ident_t conf_get_ident(char *dev);
517extern mddev_dev_t conf_get_devs(void);
518extern int conf_test_dev(char *devname);
519extern struct createinfo *conf_get_create_info(void);
520extern void set_conffile(char *file);
521extern char *conf_get_mailaddr(void);
522extern char *conf_get_mailfrom(void);
523extern char *conf_get_program(void);
524extern char *conf_get_homehost(void);
525extern char *conf_line(FILE *file);
526extern char *conf_word(FILE *file, int allow_key);
527extern void free_line(char *line);
528extern int match_oneof(char *devices, char *devname);
529extern void uuid_from_super(int uuid[4], mdp_super_t *super);
530extern int same_uuid(int a[4], int b[4], int swapuuid);
531extern void copy_uuid(void *a, int b[4], int swapuuid);
532extern unsigned long calc_csum(void *super, int bytes);
533extern int enough(int level, int raid_disks, int layout, int clean,
534 char *avail, int avail_disks);
535extern int ask(char *mesg);
536extern unsigned long long get_component_size(int fd);
537extern void remove_partitions(int fd);
538extern unsigned long long calc_array_size(int level, int raid_disks, int layout,
539 int chunksize, unsigned long long devsize);
540
541
542extern char *human_size(long long bytes);
543char *human_size_brief(long long bytes);
544
545#define NoMdDev (1<<23)
546extern int find_free_devnum(int use_partitions);
547
548extern void put_md_name(char *name);
549extern char *get_md_name(int dev);
550
551extern char DefaultConfFile[];
552
553extern int open_mddev(char *dev, int autof);
554extern int open_mddev_devnum(char *devname, int devnum, char *name,
555 char *chosen_name, int parts);
556extern int open_container(int fd);
557
558
559#define LEVEL_MULTIPATH (-4)
560#define LEVEL_LINEAR (-1)
561#define LEVEL_FAULTY (-5)
562
563/* kernel module doesn't know about these */
564#define LEVEL_CONTAINER (-100)
565#define LEVEL_UNSUPPORTED (-200)
566
567
568/* faulty stuff */
569
570#define WriteTransient 0
571#define ReadTransient 1
572#define WritePersistent 2
573#define ReadPersistent 3
574#define WriteAll 4 /* doesn't go to device */
575#define ReadFixable 5
576#define Modes 6
577
578#define ClearErrors 31
579#define ClearFaults 30
580
581#define AllPersist 100 /* internal use only */
582#define NoPersist 101
583
584#define ModeMask 0x1f
585#define ModeShift 5
586
587
588#ifdef __TINYC__
589#undef minor
590#undef major
591#undef makedev
592#define minor(x) ((x)&0xff)
593#define major(x) (((x)>>8)&0xff)
594#define makedev(M,m) (((M)<<8) | (m))
595#endif
596
597/* for raid5 */
598#define ALGORITHM_LEFT_ASYMMETRIC 0
599#define ALGORITHM_RIGHT_ASYMMETRIC 1
600#define ALGORITHM_LEFT_SYMMETRIC 2
601#define ALGORITHM_RIGHT_SYMMETRIC 3
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