2 * mdadm - manage Linux "md" devices aka RAID arrays.
4 * Copyright (C) 2001-2006 Neil Brown <neilb@suse.de>
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.
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.
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
22 * Email: <neilb@cse.unsw.edu.au>
24 * School of Computer Science and Engineering
25 * The University of New South Wales
31 #define _FILE_OFFSET_BITS 64
33 #if !defined(__dietlibc__) && !defined(__KLIBC__)
34 extern __off64_t lseek64
__P ((int __fd
, __off64_t __offset
, int __whence
));
36 # if defined(__NO_STAT64) || __WORDSIZE != 32
37 # define lseek64 lseek
41 #include <sys/types.h>
54 /* dietlibc has deprecated random and srandom!! */
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>
66 #define MdpMinorShift 6
69 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
72 #define DEFAULT_BITMAP_CHUNK 4096
73 #define DEFAULT_BITMAP_DELAY 5
74 #define DEFAULT_MAX_WRITE_BEHIND 256
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 | \
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)
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)
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)
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)
131 # error "unknown endianness."
133 #endif /* __KLIBC__ */
137 /* general information that might be extracted from a superblock */
139 mdu_array_info_t array
;
140 mdu_disk_info_t disk
;
144 unsigned long long data_offset
;
145 unsigned long long component_size
;
147 unsigned long long reshape_progress
;
148 int new_level
, delta_disks
, new_layout
, new_chunk
;
150 int cache_size
; /* size of raid456 stripe cache*/
152 char text_version
[50];
165 struct supertype
*supertype
;
182 extern char short_options
[];
183 extern char short_bitmap_options
[];
184 extern char short_bitmap_auto_options
[];
185 extern struct option long_options
[];
186 extern char Version
[], Usage
[], Help
[], OptionHelp
[],
187 Help_create
[], Help_build
[], Help_assemble
[], Help_grow
[],
189 Help_manage
[], Help_misc
[], Help_monitor
[], Help_config
[];
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'.
194 enum special_options
{
208 /* structures read from config file */
209 /* List of mddevice names and identifiers
210 * Identifiers can be:
212 * super-minor=decimal-minor-number-from-superblock
213 * devices=comma,separated,list,of,device,names,with,wildcards
215 * If multiple fields are present, the intersection of all matching
216 * devices is considered
218 #define UnSet (0xfffe)
219 typedef struct mddev_ident_s
{
226 unsigned int super_minor
;
228 char *devices
; /* comma separated list of device
229 * names with wild cards
232 unsigned int raid_disks
;
233 unsigned int spare_disks
;
234 struct supertype
*st
;
235 int autof
; /* 1 for normal, 2 for partitioned */
240 struct mddev_ident_s
*next
;
243 /* List of device names - wildcards expanded */
244 typedef struct mddev_dev_s
{
246 char disposition
; /* 'a' for add, 'r' for remove, 'f' for fail.
247 * Not set for names read from .config
251 char used
; /* set when used */
252 struct mddev_dev_s
*next
;
255 typedef struct mapping
{
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
;
272 extern struct mdstat_ent
*mdstat_read(int hold
, int start
);
273 extern void free_mdstat(struct mdstat_ent
*ms
);
274 extern void mdstat_wait(int seconds
);
275 extern int mddev_busy(int devnum
);
278 struct map_ent
*next
;
284 extern int map_update(struct map_ent
**mpp
, int devnum
, int major
, int minor
,
285 int uuid
[4], char *path
);
286 extern struct map_ent
*map_by_uuid(struct map_ent
**map
, int uuid
[4]);
287 extern void map_read(struct map_ent
**melp
);
288 extern int map_write(struct map_ent
*mel
);
289 extern void map_delete(struct map_ent
**mapp
, int devnum
);
290 extern void map_free(struct map_ent
*map
);
291 extern void map_add(struct map_ent
**melp
,
292 int devnum
, int major
, int minor
, int uuid
[4], char *path
);
294 /* various details can be requested */
297 #define GET_COMPONENT 4
300 #define GET_MISMATCH 32
301 #define GET_VERSION 64
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
309 /* If fd >= 0, get the array it is open on,
310 * else use devnum. >=0 -> major9. <0.....
312 extern void sysfs_free(struct mdinfo
*sra
);
313 extern struct mdinfo
*sysfs_read(int fd
, int devnum
, unsigned long options
);
314 extern int sysfs_set_str(struct mdinfo
*sra
, struct mdinfo
*dev
,
315 char *name
, char *val
);
316 extern int sysfs_set_num(struct mdinfo
*sra
, struct mdinfo
*dev
,
317 char *name
, unsigned long long val
);
318 extern int sysfs_get_ll(struct mdinfo
*sra
, struct mdinfo
*dev
,
319 char *name
, unsigned long long *val
);
322 extern int save_stripes(int *source
, unsigned long long *offsets
,
323 int raid_disks
, int chunk_size
, int level
, int layout
,
324 int nwrites
, int *dest
,
325 unsigned long long start
, unsigned long long length
);
326 extern int restore_stripes(int *dest
, unsigned long long *offsets
,
327 int raid_disks
, int chunk_size
, int level
, int layout
,
328 int source
, unsigned long long read_offset
,
329 unsigned long long start
, unsigned long long length
);
332 #define Sendmail "/usr/lib/sendmail -t"
335 #define SYSLOG_FACILITY LOG_DAEMON
337 extern char *map_num(mapping_t
*map
, int num
);
338 extern int map_name(mapping_t
*map
, char *name
);
339 extern mapping_t r5layout
[], pers
[], modes
[], faultylayout
[];
341 extern char *map_dev(int major
, int minor
, int create
);
344 extern struct superswitch
{
345 void (*examine_super
)(struct supertype
*st
, char *homehost
);
346 void (*brief_examine_super
)(struct supertype
*st
);
347 void (*export_examine_super
)(struct supertype
*st
);
348 void (*detail_super
)(struct supertype
*st
, char *homehost
);
349 void (*brief_detail_super
)(struct supertype
*st
);
350 void (*export_detail_super
)(struct supertype
*st
);
351 void (*uuid_from_super
)(struct supertype
*st
, int uuid
[4]);
352 void (*getinfo_super
)(struct supertype
*st
, struct mdinfo
*info
);
353 int (*match_home
)(struct supertype
*st
, char *homehost
);
354 int (*update_super
)(struct supertype
*st
, struct mdinfo
*info
,
356 char *devname
, int verbose
,
357 int uuid_set
, char *homehost
);
358 int (*init_super
)(struct supertype
*st
, mdu_array_info_t
*info
,
359 unsigned long long size
, char *name
,
360 char *homehost
, int *uuid
);
361 void (*add_to_super
)(struct supertype
*st
, mdu_disk_info_t
*dinfo
);
362 int (*store_super
)(struct supertype
*st
, int fd
);
363 int (*write_init_super
)(struct supertype
*st
, mdu_disk_info_t
*dinfo
,
365 int (*compare_super
)(struct supertype
*st
, struct supertype
*tst
);
366 int (*load_super
)(struct supertype
*st
, int fd
, char *devname
);
367 struct supertype
* (*match_metadata_desc
)(char *arg
);
368 __u64 (*avail_size
)(struct supertype
*st
, __u64 size
);
369 int (*add_internal_bitmap
)(struct supertype
*st
, int *chunkp
,
370 int delay
, int write_behind
,
371 unsigned long long size
, int may_change
, int major
);
372 void (*locate_bitmap
)(struct supertype
*st
, int fd
);
373 int (*write_bitmap
)(struct supertype
*st
, int fd
);
374 void (*free_super
)(struct supertype
*st
);
375 int (*validate_geometry
)(struct supertype
*st
, int level
, int layout
,
377 int chunk
, unsigned long long size
,
378 char *subdev
, unsigned long long *freesize
);
380 int swapuuid
; /* true if uuid is bigending rather than hostendian */
381 } super0
, super1
, *superlist
[];
384 struct superswitch
*ss
;
390 extern struct supertype
*super_by_fd(int fd
);
391 extern struct supertype
*guess_super(int fd
);
392 extern struct supertype
*dup_super(struct supertype
*st
);
393 extern int get_dev_size(int fd
, char *dname
, unsigned long long *sizep
);
394 extern void get_one_disk(int mdfd
, mdu_array_info_t
*ainf
,
395 mdu_disk_info_t
*disk
);
401 #define HAVE_NFTW we assume
405 # include <features.h>
406 # ifndef __UCLIBC_HAS_FTW__
416 #if defined(__KLIBC__)
432 extern int add_dev(const char *name
, const struct stat
*stb
, int flag
, struct FTW
*s
);
435 extern int Manage_ro(char *devname
, int fd
, int readonly
);
436 extern int Manage_runstop(char *devname
, int fd
, int runstop
, int quiet
);
437 extern int Manage_resize(char *devname
, int fd
, long long size
, int raid_disks
);
438 extern int Manage_reconfig(char *devname
, int fd
, int layout
);
439 extern int Manage_subdevs(char *devname
, int fd
,
440 mddev_dev_t devlist
, int verbose
);
441 extern int autodetect(void);
442 extern int Grow_Add_device(char *devname
, int fd
, char *newdev
);
443 extern int Grow_addbitmap(char *devname
, int fd
, char *file
, int chunk
, int delay
, int write_behind
, int force
);
444 extern int Grow_reshape(char *devname
, int fd
, int quiet
, char *backup_file
,
446 int level
, int layout
, int chunksize
, int raid_disks
);
447 extern int Grow_restart(struct supertype
*st
, struct mdinfo
*info
,
448 int *fdlist
, int cnt
, char *backup_file
);
451 extern int Assemble(struct supertype
*st
, char *mddev
, int mdfd
,
453 mddev_dev_t devlist
, char *backup_file
,
454 int readonly
, int runstop
,
455 char *update
, char *homehost
,
456 int verbose
, int force
);
458 extern int Build(char *mddev
, int mdfd
, int chunk
, int level
, int layout
,
460 mddev_dev_t devlist
, int assume_clean
,
461 char *bitmap_file
, int bitmap_chunk
, int write_behind
, int delay
, int verbose
);
464 extern int Create(struct supertype
*st
, char *mddev
, int mdfd
,
465 int chunk
, int level
, int layout
, unsigned long long size
, int raiddisks
, int sparedisks
,
466 char *name
, char *homehost
, int *uuid
,
467 int subdevs
, mddev_dev_t devlist
,
468 int runstop
, int verbose
, int force
, int assume_clean
,
469 char *bitmap_file
, int bitmap_chunk
, int write_behind
, int delay
);
471 extern int Detail(char *dev
, int brief
, int export
, int test
, char *homehost
);
472 extern int Query(char *dev
);
473 extern int Examine(mddev_dev_t devlist
, int brief
, int export
, int scan
,
474 int SparcAdjust
, struct supertype
*forcest
, char *homehost
);
475 extern int Monitor(mddev_dev_t devlist
,
476 char *mailaddr
, char *alert_cmd
,
477 int period
, int daemonise
, int scan
, int oneshot
,
478 int dosyslog
, int test
, char *pidfile
);
480 extern int Kill(char *dev
, int force
, int quiet
);
481 extern int Wait(char *dev
);
483 extern int Incremental(char *devname
, int verbose
, int runstop
,
484 struct supertype
*st
, char *homehost
, int autof
);
485 extern void RebuildMap(void);
486 extern int IncrementalScan(int verbose
);
488 extern int CreateBitmap(char *filename
, int force
, char uuid
[16],
489 unsigned long chunksize
, unsigned long daemon_sleep
,
490 unsigned long write_behind
,
491 unsigned long long array_size
,
493 extern int ExamineBitmap(char *filename
, int brief
, struct supertype
*st
);
494 extern int bitmap_update_uuid(int fd
, int *uuid
, int swap
);
496 extern int md_get_version(int fd
);
497 extern int get_linux_version(void);
498 extern int parse_uuid(char *str
, int uuid
[4]);
499 extern int check_ext2(int fd
, char *name
);
500 extern int check_reiser(int fd
, char *name
);
501 extern int check_raid(int fd
, char *name
);
503 extern int get_mdp_major(void);
504 extern int dev_open(char *dev
, int flags
);
505 extern int is_standard(char *dev
, int *nump
);
507 extern int parse_auto(char *str
, char *msg
, int config
);
508 extern mddev_ident_t
conf_get_ident(char *dev
);
509 extern mddev_dev_t
conf_get_devs(void);
510 extern int conf_test_dev(char *devname
);
511 extern struct createinfo
*conf_get_create_info(void);
512 extern void set_conffile(char *file
);
513 extern char *conf_get_mailaddr(void);
514 extern char *conf_get_mailfrom(void);
515 extern char *conf_get_program(void);
516 extern char *conf_get_homehost(void);
517 extern char *conf_line(FILE *file
);
518 extern char *conf_word(FILE *file
, int allow_key
);
519 extern void free_line(char *line
);
520 extern int match_oneof(char *devices
, char *devname
);
521 extern void uuid_from_super(int uuid
[4], mdp_super_t
*super
);
522 extern int same_uuid(int a
[4], int b
[4], int swapuuid
);
523 extern void copy_uuid(void *a
, int b
[4], int swapuuid
);
524 extern unsigned long calc_csum(void *super
, int bytes
);
525 extern int enough(int level
, int raid_disks
, int layout
, int clean
,
526 char *avail
, int avail_disks
);
527 extern int ask(char *mesg
);
528 extern unsigned long long get_component_size(int fd
);
529 extern void remove_partitions(int fd
);
532 extern char *human_size(long long bytes
);
533 char *human_size_brief(long long bytes
);
535 #define NoMdDev (1<<23)
536 extern int find_free_devnum(int use_partitions
);
538 extern void put_md_name(char *name
);
539 extern char *get_md_name(int dev
);
541 extern char DefaultConfFile
[];
543 extern int open_mddev(char *dev
, int autof
);
544 extern int open_mddev_devnum(char *devname
, int devnum
, char *name
,
545 char *chosen_name
, int parts
);
548 #define LEVEL_MULTIPATH (-4)
549 #define LEVEL_LINEAR (-1)
550 #define LEVEL_FAULTY (-5)
552 /* kernel module doesn't know about these */
553 #define LEVEL_CONTAINER (-100)
558 #define WriteTransient 0
559 #define ReadTransient 1
560 #define WritePersistent 2
561 #define ReadPersistent 3
562 #define WriteAll 4 /* doesn't go to device */
563 #define ReadFixable 5
566 #define ClearErrors 31
567 #define ClearFaults 30
569 #define AllPersist 100 /* internal use only */
570 #define NoPersist 101
572 #define ModeMask 0x1f
580 #define minor(x) ((x)&0xff)
581 #define major(x) (((x)>>8)&0xff)
582 #define makedev(M,m) (((M)<<8) | (m))
586 #define ALGORITHM_LEFT_ASYMMETRIC 0
587 #define ALGORITHM_RIGHT_ASYMMETRIC 1
588 #define ALGORITHM_LEFT_SYMMETRIC 2
589 #define ALGORITHM_RIGHT_SYMMETRIC 3