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)
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)
117 # error "unknown endianness."
119 #endif /* __KLIBC__ */
123 /* general information that might be extracted from a superblock */
125 mdu_array_info_t array
;
126 mdu_disk_info_t disk
;
130 unsigned long long data_offset
;
131 unsigned long long component_size
;
133 unsigned long long reshape_progress
;
134 int new_level
, delta_disks
, new_layout
, new_chunk
;
136 int cache_size
; /* size of raid456 stripe cache*/
138 char text_version
[50];
151 struct supertype
*supertype
;
168 extern char short_options
[];
169 extern char short_bitmap_options
[];
170 extern char short_bitmap_auto_options
[];
171 extern struct option long_options
[];
172 extern char Version
[], Usage
[], Help
[], OptionHelp
[],
173 Help_create
[], Help_build
[], Help_assemble
[], Help_grow
[],
175 Help_manage
[], Help_misc
[], Help_monitor
[], Help_config
[];
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'.
180 enum special_options
{
194 /* structures read from config file */
195 /* List of mddevice names and identifiers
196 * Identifiers can be:
198 * super-minor=decimal-minor-number-from-superblock
199 * devices=comma,separated,list,of,device,names,with,wildcards
201 * If multiple fields are present, the intersection of all matching
202 * devices is considered
204 #define UnSet (0xfffe)
205 typedef struct mddev_ident_s
{
212 unsigned int super_minor
;
214 char *devices
; /* comma separated list of device
215 * names with wild cards
218 unsigned int raid_disks
;
219 unsigned int spare_disks
;
220 struct supertype
*st
;
221 int autof
; /* 1 for normal, 2 for partitioned */
226 struct mddev_ident_s
*next
;
229 /* List of device names - wildcards expanded */
230 typedef struct mddev_dev_s
{
232 char disposition
; /* 'a' for add, 'r' for remove, 'f' for fail.
233 * Not set for names read from .config
235 char writemostly
; /* 1 for 'set writemostly', 2 for 'clear writemostly' */
237 char used
; /* set when used */
238 struct mddev_dev_s
*next
;
241 typedef struct mapping
{
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
;
258 extern struct mdstat_ent
*mdstat_read(int hold
, int start
);
259 extern void free_mdstat(struct mdstat_ent
*ms
);
260 extern void mdstat_wait(int seconds
);
261 extern int mddev_busy(int devnum
);
264 struct map_ent
*next
;
270 extern int map_update(struct map_ent
**mpp
, int devnum
, int major
, int minor
,
271 int uuid
[4], char *path
);
272 extern struct map_ent
*map_by_uuid(struct map_ent
**map
, int uuid
[4]);
273 extern void map_read(struct map_ent
**melp
);
274 extern int map_write(struct map_ent
*mel
);
275 extern void map_delete(struct map_ent
**mapp
, int devnum
);
276 extern void map_free(struct map_ent
*map
);
277 extern void map_add(struct map_ent
**melp
,
278 int devnum
, int major
, int minor
, int uuid
[4], char *path
);
280 /* various details can be requested */
283 #define GET_COMPONENT 4
286 #define GET_MISMATCH 32
287 #define GET_VERSION 64
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
295 /* If fd >= 0, get the array it is open on,
296 * else use devnum. >=0 -> major9. <0.....
298 extern void sysfs_free(struct mdinfo
*sra
);
299 extern struct mdinfo
*sysfs_read(int fd
, int devnum
, unsigned long options
);
300 extern int sysfs_set_str(struct mdinfo
*sra
, struct mdinfo
*dev
,
301 char *name
, char *val
);
302 extern int sysfs_set_num(struct mdinfo
*sra
, struct mdinfo
*dev
,
303 char *name
, unsigned long long val
);
304 extern int sysfs_get_ll(struct mdinfo
*sra
, struct mdinfo
*dev
,
305 char *name
, unsigned long long *val
);
308 extern 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
);
312 extern 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
);
318 #define Sendmail "/usr/lib/sendmail -t"
321 #define SYSLOG_FACILITY LOG_DAEMON
323 extern char *map_num(mapping_t
*map
, int num
);
324 extern int map_name(mapping_t
*map
, char *name
);
325 extern mapping_t r5layout
[], pers
[], modes
[], faultylayout
[];
327 extern char *map_dev(int major
, int minor
, int create
);
330 extern struct superswitch
{
331 void (*examine_super
)(struct supertype
*st
, char *homehost
);
332 void (*brief_examine_super
)(struct supertype
*st
);
333 void (*export_examine_super
)(struct supertype
*st
);
334 void (*detail_super
)(struct supertype
*st
, char *homehost
);
335 void (*brief_detail_super
)(struct supertype
*st
);
336 void (*export_detail_super
)(struct supertype
*st
);
337 void (*uuid_from_super
)(struct supertype
*st
, int uuid
[4]);
338 void (*getinfo_super
)(struct supertype
*st
, struct mdinfo
*info
);
339 int (*match_home
)(struct supertype
*st
, char *homehost
);
340 int (*update_super
)(struct supertype
*st
, struct mdinfo
*info
,
342 char *devname
, int verbose
,
343 int uuid_set
, char *homehost
);
344 int (*init_super
)(struct supertype
*st
, mdu_array_info_t
*info
,
345 unsigned long long size
, char *name
,
346 char *homehost
, int *uuid
);
347 void (*add_to_super
)(struct supertype
*st
, mdu_disk_info_t
*dinfo
);
348 int (*store_super
)(struct supertype
*st
, int fd
);
349 int (*write_init_super
)(struct supertype
*st
, mdu_disk_info_t
*dinfo
,
351 int (*compare_super
)(struct supertype
*st
, struct supertype
*tst
);
352 int (*load_super
)(struct supertype
*st
, int fd
, char *devname
);
353 struct supertype
* (*match_metadata_desc
)(char *arg
);
354 __u64 (*avail_size
)(struct supertype
*st
, __u64 size
);
355 int (*add_internal_bitmap
)(struct supertype
*st
, int *chunkp
,
356 int delay
, int write_behind
,
357 unsigned long long size
, int may_change
, int major
);
358 void (*locate_bitmap
)(struct supertype
*st
, int fd
);
359 int (*write_bitmap
)(struct supertype
*st
, int fd
);
360 void (*free_super
)(struct supertype
*st
);
362 int swapuuid
; /* true if uuid is bigending rather than hostendian */
363 } super0
, super1
, *superlist
[];
366 struct superswitch
*ss
;
372 extern struct supertype
*super_by_fd(int fd
);
373 extern struct supertype
*guess_super(int fd
);
374 extern struct supertype
*dup_super(struct supertype
*st
);
375 extern int get_dev_size(int fd
, char *dname
, unsigned long long *sizep
);
376 extern void get_one_disk(int mdfd
, mdu_array_info_t
*ainf
,
377 mdu_disk_info_t
*disk
);
383 #define HAVE_NFTW we assume
387 # include <features.h>
388 # ifndef __UCLIBC_HAS_FTW__
398 #if defined(__KLIBC__)
414 extern int add_dev(const char *name
, const struct stat
*stb
, int flag
, struct FTW
*s
);
417 extern int Manage_ro(char *devname
, int fd
, int readonly
);
418 extern int Manage_runstop(char *devname
, int fd
, int runstop
, int quiet
);
419 extern int Manage_resize(char *devname
, int fd
, long long size
, int raid_disks
);
420 extern int Manage_reconfig(char *devname
, int fd
, int layout
);
421 extern int Manage_subdevs(char *devname
, int fd
,
422 mddev_dev_t devlist
, int verbose
);
423 extern int autodetect(void);
424 extern int Grow_Add_device(char *devname
, int fd
, char *newdev
);
425 extern int Grow_addbitmap(char *devname
, int fd
, char *file
, int chunk
, int delay
, int write_behind
, int force
);
426 extern int Grow_reshape(char *devname
, int fd
, int quiet
, char *backup_file
,
428 int level
, int layout
, int chunksize
, int raid_disks
);
429 extern int Grow_restart(struct supertype
*st
, struct mdinfo
*info
,
430 int *fdlist
, int cnt
, char *backup_file
);
433 extern int Assemble(struct supertype
*st
, char *mddev
, int mdfd
,
435 mddev_dev_t devlist
, char *backup_file
,
436 int readonly
, int runstop
,
437 char *update
, char *homehost
,
438 int verbose
, int force
);
440 extern int Build(char *mddev
, int mdfd
, int chunk
, int level
, int layout
,
442 mddev_dev_t devlist
, int assume_clean
,
443 char *bitmap_file
, int bitmap_chunk
, int write_behind
, int delay
, int verbose
);
446 extern int Create(struct supertype
*st
, char *mddev
, int mdfd
,
447 int chunk
, int level
, int layout
, unsigned long long size
, int raiddisks
, int sparedisks
,
448 char *name
, char *homehost
, int *uuid
,
449 int subdevs
, mddev_dev_t devlist
,
450 int runstop
, int verbose
, int force
, int assume_clean
,
451 char *bitmap_file
, int bitmap_chunk
, int write_behind
, int delay
);
453 extern int Detail(char *dev
, int brief
, int export
, int test
, char *homehost
);
454 extern int Query(char *dev
);
455 extern int Examine(mddev_dev_t devlist
, int brief
, int export
, int scan
,
456 int SparcAdjust
, struct supertype
*forcest
, char *homehost
);
457 extern int Monitor(mddev_dev_t devlist
,
458 char *mailaddr
, char *alert_cmd
,
459 int period
, int daemonise
, int scan
, int oneshot
,
460 int dosyslog
, int test
, char *pidfile
);
462 extern int Kill(char *dev
, int force
, int quiet
);
463 extern int Wait(char *dev
);
465 extern int Incremental(char *devname
, int verbose
, int runstop
,
466 struct supertype
*st
, char *homehost
, int autof
);
467 extern void RebuildMap(void);
468 extern int IncrementalScan(int verbose
);
470 extern int CreateBitmap(char *filename
, int force
, char uuid
[16],
471 unsigned long chunksize
, unsigned long daemon_sleep
,
472 unsigned long write_behind
,
473 unsigned long long array_size
,
475 extern int ExamineBitmap(char *filename
, int brief
, struct supertype
*st
);
476 extern int bitmap_update_uuid(int fd
, int *uuid
, int swap
);
477 extern unsigned long bitmap_sectors(struct bitmap_super_s
*bsb
);
479 extern int md_get_version(int fd
);
480 extern int get_linux_version(void);
481 extern int parse_uuid(char *str
, int uuid
[4]);
482 extern int check_ext2(int fd
, char *name
);
483 extern int check_reiser(int fd
, char *name
);
484 extern int check_raid(int fd
, char *name
);
486 extern int get_mdp_major(void);
487 extern int dev_open(char *dev
, int flags
);
488 extern int is_standard(char *dev
, int *nump
);
490 extern int parse_auto(char *str
, char *msg
, int config
);
491 extern mddev_ident_t
conf_get_ident(char *dev
);
492 extern mddev_dev_t
conf_get_devs(void);
493 extern int conf_test_dev(char *devname
);
494 extern struct createinfo
*conf_get_create_info(void);
495 extern void set_conffile(char *file
);
496 extern char *conf_get_mailaddr(void);
497 extern char *conf_get_mailfrom(void);
498 extern char *conf_get_program(void);
499 extern char *conf_get_homehost(void);
500 extern char *conf_line(FILE *file
);
501 extern char *conf_word(FILE *file
, int allow_key
);
502 extern void free_line(char *line
);
503 extern int match_oneof(char *devices
, char *devname
);
504 extern void uuid_from_super(int uuid
[4], mdp_super_t
*super
);
505 extern int same_uuid(int a
[4], int b
[4], int swapuuid
);
506 extern void copy_uuid(void *a
, int b
[4], int swapuuid
);
507 extern unsigned long calc_csum(void *super
, int bytes
);
508 extern int enough(int level
, int raid_disks
, int layout
, int clean
,
509 char *avail
, int avail_disks
);
510 extern int ask(char *mesg
);
511 extern unsigned long long get_component_size(int fd
);
512 extern void remove_partitions(int fd
);
515 extern char *human_size(long long bytes
);
516 extern char *human_size_brief(long long bytes
);
517 extern void print_r10_layout(int layout
);
519 #define NoMdDev (1<<23)
520 extern int find_free_devnum(int use_partitions
);
522 extern void put_md_name(char *name
);
523 extern char *get_md_name(int dev
);
525 extern char DefaultConfFile
[];
527 extern int open_mddev(char *dev
, int autof
);
528 extern int open_mddev_devnum(char *devname
, int devnum
, char *name
,
529 char *chosen_name
, int parts
);
532 #define LEVEL_MULTIPATH (-4)
533 #define LEVEL_LINEAR (-1)
534 #define LEVEL_FAULTY (-5)
539 #define WriteTransient 0
540 #define ReadTransient 1
541 #define WritePersistent 2
542 #define ReadPersistent 3
543 #define WriteAll 4 /* doesn't go to device */
544 #define ReadFixable 5
547 #define ClearErrors 31
548 #define ClearFaults 30
550 #define AllPersist 100 /* internal use only */
551 #define NoPersist 101
553 #define ModeMask 0x1f
561 #define minor(x) ((x)&0xff)
562 #define major(x) (((x)>>8)&0xff)
563 #define makedev(M,m) (((M)<<8) | (m))
567 #define ALGORITHM_LEFT_ASYMMETRIC 0
568 #define ALGORITHM_RIGHT_ASYMMETRIC 1
569 #define ALGORITHM_LEFT_SYMMETRIC 2
570 #define ALGORITHM_RIGHT_SYMMETRIC 3