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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#include <unistd.h>
32#ifndef __dietlibc__
33extern __off64_t lseek64 __P ((int __fd, __off64_t __offset, int __whence));
34#endif
35
36#include <sys/types.h>
37#include <sys/stat.h>
38#include <stdlib.h>
39#include <time.h>
40#include <sys/time.h>
41#include <getopt.h>
42#include <fcntl.h>
43#include <stdio.h>
44#include <errno.h>
45#include <string.h>
46#include <syslog.h>
47#ifdef __dietlibc__
48#include <strings.h>
49/* dietlibc has deprecated random and srandom!! */
50#define random rand
51#define srandom srand
52#endif
53
54
55#include <linux/kdev_t.h>
56/*#include <linux/fs.h> */
57#include <sys/mount.h>
58#include <asm/types.h>
59#include <sys/ioctl.h>
60#define MD_MAJOR 9
61#define MdpMinorShift 6
62
63#ifndef BLKGETSIZE64
64#define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
65#endif
66
67#define DEFAULT_BITMAP_CHUNK 4096
68#define DEFAULT_BITMAP_DELAY 5
69#define DEFAULT_MAX_WRITE_BEHIND 256
70
71#include "md_u.h"
72#include "md_p.h"
73#include "bitmap.h"
74
75#include <endian.h>
76/* #include "asm/byteorder.h" Redhat don't like this so... */
77#if __BYTE_ORDER == __LITTLE_ENDIAN
78# include <linux/byteorder/little_endian.h>
79#elif __BYTE_ORDER == __BIG_ENDIAN
80# include <linux/byteorder/big_endian.h>
81#elif __BYTE_ORDER == __PDP_ENDIAN
82# include <linux/byteorder/pdp_endian.h>
83#else
84# error "unknown endianness."
85#endif
86
87
88
89/* general information that might be extracted from a superblock */
90struct mdinfo {
91 mdu_array_info_t array;
92 mdu_disk_info_t disk;
93 __u64 events;
94 int uuid[4];
95 char name[33];
96 unsigned long long data_offset;
97 unsigned long long component_size;
98 int reshape_active;
99 unsigned long long reshape_progress;
100 int new_level, delta_disks, new_layout, new_chunk;
101};
102
103struct createinfo {
104 int uid;
105 int gid;
106 int autof;
107 int mode;
108};
109
110#define Name "mdadm"
111
112enum mode {
113 ASSEMBLE=1,
114 BUILD,
115 CREATE,
116 MANAGE,
117 MISC,
118 MONITOR,
119 GROW,
120};
121
122extern char short_options[];
123extern char short_bitmap_auto_options[];
124extern struct option long_options[];
125extern char Version[], Usage[], Help[], OptionHelp[],
126 Help_create[], Help_build[], Help_assemble[], Help_grow[],
127 Help_manage[], Help_misc[], Help_monitor[], Help_config[];
128
129/* for option that don't have short equivilents, we assign arbitrary
130 * small numbers. '1' means an undecorated option, so we start at '2'.
131 */
132enum special_options {
133 AssumeClean = 2,
134 BitmapChunk,
135 WriteBehind,
136 ReAdd,
137 NoDegraded,
138 Sparc22,
139 BackupFile,
140 HomeHost,
141 AutoHomeHost,
142};
143
144/* structures read from config file */
145/* List of mddevice names and identifiers
146 * Identifiers can be:
147 * uuid=128-hex-uuid
148 * super-minor=decimal-minor-number-from-superblock
149 * devices=comma,separated,list,of,device,names,with,wildcards
150 *
151 * If multiple fields are present, the intersection of all matching
152 * devices is considered
153 */
154#define UnSet (0xfffe)
155typedef struct mddev_ident_s {
156 char *devname;
157
158 int uuid_set;
159 int uuid[4];
160 char name[33];
161
162 unsigned int super_minor;
163
164 char *devices; /* comma separated list of device
165 * names with wild cards
166 */
167 int level;
168 unsigned int raid_disks;
169 unsigned int spare_disks;
170 struct supertype *st;
171 int autof; /* 1 for normal, 2 for partitioned */
172 char *spare_group;
173 char *bitmap_file;
174 int bitmap_fd;
175
176 struct mddev_ident_s *next;
177} *mddev_ident_t;
178
179/* List of device names - wildcards expanded */
180typedef struct mddev_dev_s {
181 char *devname;
182 char disposition; /* 'a' for add, 'r' for remove, 'f' for fail.
183 * Not set for names read from .config
184 */
185 char writemostly;
186 char re_add;
187 char used; /* set when used */
188 struct mddev_dev_s *next;
189} *mddev_dev_t;
190
191typedef struct mapping {
192 char *name;
193 int num;
194} mapping_t;
195
196
197struct mdstat_ent {
198 char *dev;
199 int devnum;
200 int active;
201 char *level;
202 char *pattern; /* U or up, _ for down */
203 int percent; /* -1 if no resync */
204 int resync; /* 1 if resync, 0 if recovery */
205 struct mdstat_ent *next;
206};
207
208extern struct mdstat_ent *mdstat_read(int hold, int start);
209extern void free_mdstat(struct mdstat_ent *ms);
210extern void mdstat_wait(int seconds);
211
212/* Data structure for holding info read from sysfs */
213struct sysdev {
214 char name[20];
215 int role;
216 int major, minor;
217 unsigned long long offset, size;
218 int state;
219 int errors;
220 struct sysdev *next;
221};
222struct sysarray {
223 char name[20];
224 struct sysdev *devs;
225 int chunk;
226 unsigned long long component_size;
227 int layout;
228 int level;
229 int spares;
230};
231/* various details can be requested */
232#define GET_LEVEL 1
233#define GET_LAYOUT 2
234#define GET_COMPONENT 4
235#define GET_CHUNK 8
236
237#define GET_DEVS 1024 /* gets role, major, minor */
238#define GET_OFFSET 2048
239#define GET_SIZE 4096
240#define GET_STATE 8192
241#define GET_ERROR 16384
242
243/* If fd >= 0, get the array it is open on,
244 * else use devnum. >=0 -> major9. <0.....
245 */
246extern struct sysarray *sysfs_read(int fd, int devnum, unsigned long options);
247extern int sysfs_set_str(struct sysarray *sra, struct sysdev *dev,
248 char *name, char *val);
249extern int sysfs_set_num(struct sysarray *sra, struct sysdev *dev,
250 char *name, unsigned long long val);
251extern int sysfs_get_ll(struct sysarray *sra, struct sysdev *dev,
252 char *name, unsigned long long *val);
253
254
255extern int save_stripes(int *source, unsigned long long *offsets,
256 int raid_disks, int chunk_size, int level, int layout,
257 int nwrites, int *dest,
258 unsigned long long start, unsigned long long length);
259extern int restore_stripes(int *dest, unsigned long long *offsets,
260 int raid_disks, int chunk_size, int level, int layout,
261 int source, unsigned long long read_offset,
262 unsigned long long start, unsigned long long length);
263
264#ifndef Sendmail
265#define Sendmail "/usr/lib/sendmail -t"
266#endif
267
268#define SYSLOG_FACILITY LOG_DAEMON
269
270extern char *map_num(mapping_t *map, int num);
271extern int map_name(mapping_t *map, char *name);
272extern mapping_t r5layout[], pers[], modes[], faultylayout[];
273
274extern char *map_dev(int major, int minor, int create);
275
276
277extern struct superswitch {
278 void (*examine_super)(void *sbv, char *homehost);
279 void (*brief_examine_super)(void *sbv);
280 void (*detail_super)(void *sbv, char *homehost);
281 void (*brief_detail_super)(void *sbv);
282 void (*uuid_from_super)(int uuid[4], void *sbv);
283 void (*getinfo_super)(struct mdinfo *info, void *sbv);
284 int (*match_home)(void *sbv, char *homehost);
285 int (*update_super)(struct mdinfo *info, void *sbv, char *update,
286 char *devname, int verbose,
287 int uuid_set, char *homehost);
288 __u64 (*event_super)(void *sbv);
289 int (*init_super)(struct supertype *st, void **sbp, mdu_array_info_t *info, unsigned long long size, char *name, char *homehost);
290 void (*add_to_super)(void *sbv, mdu_disk_info_t *dinfo);
291 int (*store_super)(struct supertype *st, int fd, void *sbv);
292 int (*write_init_super)(struct supertype *st, void *sbv, mdu_disk_info_t *dinfo, char *devname);
293 int (*compare_super)(void **firstp, void *secondv);
294 int (*load_super)(struct supertype *st, int fd, void **sbp, char *devname);
295 struct supertype * (*match_metadata_desc)(char *arg);
296 __u64 (*avail_size)(struct supertype *st, __u64 size);
297 int (*add_internal_bitmap)(struct supertype *st, void *sbv, int chunk, int delay, int write_behind,
298 unsigned long long size, int may_change, int major);
299 void (*locate_bitmap)(struct supertype *st, int fd, void *sbv);
300 int (*write_bitmap)(struct supertype *st, int fd, void *sbv);
301 int major;
302 int swapuuid; /* true if uuid is bigending rather than hostendian */
303} super0, super1, *superlist[];
304
305struct supertype {
306 struct superswitch *ss;
307 int minor_version;
308 int max_devs;
309};
310
311extern struct supertype *super_by_version(int vers, int minor);
312extern struct supertype *guess_super(int fd);
313
314#if __GNUC__ < 3
315struct stat64;
316#endif
317
318#ifdef UCLIBC
319 struct FTW {};
320# define FTW_PHYS 1
321#else
322# include <ftw.h>
323# ifdef __dietlibc__
324# define FTW_PHYS 1
325# endif
326#endif
327
328extern int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s);
329
330
331extern int Manage_ro(char *devname, int fd, int readonly);
332extern int Manage_runstop(char *devname, int fd, int runstop, int quiet);
333extern int Manage_resize(char *devname, int fd, long long size, int raid_disks);
334extern int Manage_reconfig(char *devname, int fd, int layout);
335extern int Manage_subdevs(char *devname, int fd,
336 mddev_dev_t devlist, int verbose);
337extern int Grow_Add_device(char *devname, int fd, char *newdev);
338extern int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int write_behind, int force);
339extern int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
340 long long size,
341 int level, int layout, int chunksize, int raid_disks);
342extern int Grow_restart(struct supertype *st, struct mdinfo *info,
343 int *fdlist, int cnt, char *backup_file);
344
345
346extern int Assemble(struct supertype *st, char *mddev, int mdfd,
347 mddev_ident_t ident,
348 char *conffile,
349 mddev_dev_t devlist, char *backup_file,
350 int readonly, int runstop,
351 char *update, char *homehost,
352 int verbose, int force);
353
354extern int Build(char *mddev, int mdfd, int chunk, int level, int layout,
355 int raiddisks,
356 mddev_dev_t devlist, int assume_clean,
357 char *bitmap_file, int bitmap_chunk, int write_behind, int delay, int verbose);
358
359
360extern int Create(struct supertype *st, char *mddev, int mdfd,
361 int chunk, int level, int layout, unsigned long long size, int raiddisks, int sparedisks,
362 char *name, char *homehost,
363 int subdevs, mddev_dev_t devlist,
364 int runstop, int verbose, int force, int assume_clean,
365 char *bitmap_file, int bitmap_chunk, int write_behind, int delay);
366
367extern int Detail(char *dev, int brief, int test, char *homehost);
368extern int Query(char *dev);
369extern int Examine(mddev_dev_t devlist, int brief, int scan, int SparcAdjust,
370 struct supertype *forcest, char *homehost);
371extern int Monitor(mddev_dev_t devlist,
372 char *mailaddr, char *alert_cmd,
373 int period, int daemonise, int scan, int oneshot,
374 int dosyslog, char *config, int test, char *pidfile);
375
376extern int Kill(char *dev, int force, int quiet);
377
378extern int CreateBitmap(char *filename, int force, char uuid[16],
379 unsigned long chunksize, unsigned long daemon_sleep,
380 unsigned long write_behind,
381 unsigned long long array_size,
382 int major);
383extern int ExamineBitmap(char *filename, int brief, struct supertype *st);
384extern int bitmap_update_uuid(int fd, int *uuid);
385
386extern int md_get_version(int fd);
387extern int get_linux_version(void);
388extern int parse_uuid(char *str, int uuid[4]);
389extern int check_ext2(int fd, char *name);
390extern int check_reiser(int fd, char *name);
391extern int check_raid(int fd, char *name);
392
393extern int get_mdp_major(void);
394extern int dev_open(char *dev, int flags);
395extern int is_standard(char *dev, int *nump);
396
397extern int parse_auto(char *str, char *msg, int config);
398extern mddev_ident_t conf_get_ident(char *conffile, char *dev);
399extern mddev_dev_t conf_get_devs(char *conffile);
400extern struct createinfo *conf_get_create_info(char *conffile);
401extern char *conf_get_mailaddr(char *conffile);
402extern char *conf_get_mailfrom(char *conffile);
403extern char *conf_get_program(char *conffile);
404extern char *conf_get_homehost(char *conffile);
405extern char *conf_line(FILE *file);
406extern char *conf_word(FILE *file, int allow_key);
407extern void free_line(char *line);
408extern int match_oneof(char *devices, char *devname);
409extern void uuid_from_super(int uuid[4], mdp_super_t *super);
410extern int same_uuid(int a[4], int b[4], int swapuuid);
411/* extern int compare_super(mdp_super_t *first, mdp_super_t *second);*/
412extern unsigned long calc_csum(void *super, int bytes);
413extern int enough(int level, int raid_disks, int layout,
414 char *avail, int avail_disks);
415extern int ask(char *mesg);
416extern unsigned long long get_component_size(int fd);
417
418
419extern char *human_size(long long bytes);
420char *human_size_brief(long long bytes);
421
422extern void put_md_name(char *name);
423extern char *get_md_name(int dev);
424
425extern char DefaultConfFile[];
426
427extern int open_mddev(char *dev, int autof);
428
429
430#define LEVEL_MULTIPATH (-4)
431#define LEVEL_LINEAR (-1)
432#define LEVEL_FAULTY (-5)
433
434
435/* faulty stuff */
436
437#define WriteTransient 0
438#define ReadTransient 1
439#define WritePersistent 2
440#define ReadPersistent 3
441#define WriteAll 4 /* doesn't go to device */
442#define ReadFixable 5
443#define Modes 6
444
445#define ClearErrors 31
446#define ClearFaults 30
447
448#define AllPersist 100 /* internal use only */
449#define NoPersist 101
450
451#define ModeMask 0x1f
452#define ModeShift 5
453
454
455#ifdef __TINYC__
456#undef minor
457#undef major
458#undef makedev
459#define minor(x) ((x)&0xff)
460#define major(x) (((x)>>8)&0xff)
461#define makedev(M,m) (((M)<<8) | (m))
462#endif
463
464/* for raid5 */
465#define ALGORITHM_LEFT_ASYMMETRIC 0
466#define ALGORITHM_RIGHT_ASYMMETRIC 1
467#define ALGORITHM_LEFT_SYMMETRIC 2
468#define ALGORITHM_RIGHT_SYMMETRIC 3
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