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
33 extern __off64_t lseek64
__P ((int __fd
, __off64_t __offset
, int __whence
));
36 #include <sys/types.h>
49 /* dietlibc has deprecated random and srandom!! */
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>
61 #define MdpMinorShift 6
64 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
67 #define DEFAULT_BITMAP_CHUNK 4096
68 #define DEFAULT_BITMAP_DELAY 5
69 #define DEFAULT_MAX_WRITE_BEHIND 256
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>
84 # error "unknown endianness."
89 /* general information that might be extracted from a superblock */
91 mdu_array_info_t array
;
96 unsigned long long data_offset
;
97 unsigned long long component_size
;
99 unsigned long long reshape_progress
;
100 int new_level
, delta_disks
, new_layout
, new_chunk
;
122 extern char short_options
[];
123 extern char short_bitmap_auto_options
[];
124 extern struct option long_options
[];
125 extern char Version
[], Usage
[], Help
[], OptionHelp
[],
126 Help_create
[], Help_build
[], Help_assemble
[], Help_grow
[],
127 Help_manage
[], Help_misc
[], Help_monitor
[], Help_config
[];
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'.
132 enum special_options
{
144 /* structures read from config file */
145 /* List of mddevice names and identifiers
146 * Identifiers can be:
148 * super-minor=decimal-minor-number-from-superblock
149 * devices=comma,separated,list,of,device,names,with,wildcards
151 * If multiple fields are present, the intersection of all matching
152 * devices is considered
154 #define UnSet (0xfffe)
155 typedef struct mddev_ident_s
{
162 unsigned int super_minor
;
164 char *devices
; /* comma separated list of device
165 * names with wild cards
168 unsigned int raid_disks
;
169 unsigned int spare_disks
;
170 struct supertype
*st
;
171 int autof
; /* 1 for normal, 2 for partitioned */
176 struct mddev_ident_s
*next
;
179 /* List of device names - wildcards expanded */
180 typedef struct mddev_dev_s
{
182 char disposition
; /* 'a' for add, 'r' for remove, 'f' for fail.
183 * Not set for names read from .config
187 char used
; /* set when used */
188 struct mddev_dev_s
*next
;
191 typedef struct mapping
{
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
;
208 extern struct mdstat_ent
*mdstat_read(int hold
, int start
);
209 extern void free_mdstat(struct mdstat_ent
*ms
);
210 extern void mdstat_wait(int seconds
);
212 /* Data structure for holding info read from sysfs */
217 unsigned long long offset
, size
;
226 unsigned long long component_size
;
231 /* various details can be requested */
234 #define GET_COMPONENT 4
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
243 /* If fd >= 0, get the array it is open on,
244 * else use devnum. >=0 -> major9. <0.....
246 extern struct sysarray
*sysfs_read(int fd
, int devnum
, unsigned long options
);
247 extern int sysfs_set_str(struct sysarray
*sra
, struct sysdev
*dev
,
248 char *name
, char *val
);
249 extern int sysfs_set_num(struct sysarray
*sra
, struct sysdev
*dev
,
250 char *name
, unsigned long long val
);
251 extern int sysfs_get_ll(struct sysarray
*sra
, struct sysdev
*dev
,
252 char *name
, unsigned long long *val
);
255 extern 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
);
259 extern 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
);
265 #define Sendmail "/usr/lib/sendmail -t"
268 #define SYSLOG_FACILITY LOG_DAEMON
270 extern char *map_num(mapping_t
*map
, int num
);
271 extern int map_name(mapping_t
*map
, char *name
);
272 extern mapping_t r5layout
[], pers
[], modes
[], faultylayout
[];
274 extern char *map_dev(int major
, int minor
, int create
);
277 extern 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
);
302 int swapuuid
; /* true if uuid is bigending rather than hostendian */
303 } super0
, super1
, *superlist
[];
306 struct superswitch
*ss
;
311 extern struct supertype
*super_by_version(int vers
, int minor
);
312 extern struct supertype
*guess_super(int fd
);
328 extern int add_dev(const char *name
, const struct stat
*stb
, int flag
, struct FTW
*s
);
331 extern int Manage_ro(char *devname
, int fd
, int readonly
);
332 extern int Manage_runstop(char *devname
, int fd
, int runstop
, int quiet
);
333 extern int Manage_resize(char *devname
, int fd
, long long size
, int raid_disks
);
334 extern int Manage_reconfig(char *devname
, int fd
, int layout
);
335 extern int Manage_subdevs(char *devname
, int fd
,
336 mddev_dev_t devlist
, int verbose
);
337 extern int Grow_Add_device(char *devname
, int fd
, char *newdev
);
338 extern int Grow_addbitmap(char *devname
, int fd
, char *file
, int chunk
, int delay
, int write_behind
, int force
);
339 extern int Grow_reshape(char *devname
, int fd
, int quiet
, char *backup_file
,
341 int level
, int layout
, int chunksize
, int raid_disks
);
342 extern int Grow_restart(struct supertype
*st
, struct mdinfo
*info
,
343 int *fdlist
, int cnt
, char *backup_file
);
346 extern int Assemble(struct supertype
*st
, char *mddev
, int mdfd
,
349 mddev_dev_t devlist
, char *backup_file
,
350 int readonly
, int runstop
,
351 char *update
, char *homehost
,
352 int verbose
, int force
);
354 extern int Build(char *mddev
, int mdfd
, int chunk
, int level
, int layout
,
356 mddev_dev_t devlist
, int assume_clean
,
357 char *bitmap_file
, int bitmap_chunk
, int write_behind
, int delay
, int verbose
);
360 extern 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
);
367 extern int Detail(char *dev
, int brief
, int test
, char *homehost
);
368 extern int Query(char *dev
);
369 extern int Examine(mddev_dev_t devlist
, int brief
, int scan
, int SparcAdjust
,
370 struct supertype
*forcest
, char *homehost
);
371 extern 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
);
376 extern int Kill(char *dev
, int force
, int quiet
);
378 extern 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
,
383 extern int ExamineBitmap(char *filename
, int brief
, struct supertype
*st
);
384 extern int bitmap_update_uuid(int fd
, int *uuid
);
386 extern int md_get_version(int fd
);
387 extern int get_linux_version(void);
388 extern int parse_uuid(char *str
, int uuid
[4]);
389 extern int check_ext2(int fd
, char *name
);
390 extern int check_reiser(int fd
, char *name
);
391 extern int check_raid(int fd
, char *name
);
393 extern int get_mdp_major(void);
394 extern int dev_open(char *dev
, int flags
);
395 extern int is_standard(char *dev
, int *nump
);
397 extern int parse_auto(char *str
, char *msg
, int config
);
398 extern mddev_ident_t
conf_get_ident(char *conffile
, char *dev
);
399 extern mddev_dev_t
conf_get_devs(char *conffile
);
400 extern struct createinfo
*conf_get_create_info(char *conffile
);
401 extern char *conf_get_mailaddr(char *conffile
);
402 extern char *conf_get_mailfrom(char *conffile
);
403 extern char *conf_get_program(char *conffile
);
404 extern char *conf_get_homehost(char *conffile
);
405 extern char *conf_line(FILE *file
);
406 extern char *conf_word(FILE *file
, int allow_key
);
407 extern void free_line(char *line
);
408 extern int match_oneof(char *devices
, char *devname
);
409 extern void uuid_from_super(int uuid
[4], mdp_super_t
*super
);
410 extern int same_uuid(int a
[4], int b
[4], int swapuuid
);
411 /* extern int compare_super(mdp_super_t *first, mdp_super_t *second);*/
412 extern unsigned long calc_csum(void *super
, int bytes
);
413 extern int enough(int level
, int raid_disks
, int layout
,
414 char *avail
, int avail_disks
);
415 extern int ask(char *mesg
);
416 extern unsigned long long get_component_size(int fd
);
419 extern char *human_size(long long bytes
);
420 char *human_size_brief(long long bytes
);
422 extern void put_md_name(char *name
);
423 extern char *get_md_name(int dev
);
425 extern char DefaultConfFile
[];
427 extern int open_mddev(char *dev
, int autof
);
430 #define LEVEL_MULTIPATH (-4)
431 #define LEVEL_LINEAR (-1)
432 #define LEVEL_FAULTY (-5)
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
445 #define ClearErrors 31
446 #define ClearFaults 30
448 #define AllPersist 100 /* internal use only */
449 #define NoPersist 101
451 #define ModeMask 0x1f
459 #define minor(x) ((x)&0xff)
460 #define major(x) (((x)>>8)&0xff)
461 #define makedev(M,m) (((M)<<8) | (m))
465 #define ALGORITHM_LEFT_ASYMMETRIC 0
466 #define ALGORITHM_RIGHT_ASYMMETRIC 1
467 #define ALGORITHM_LEFT_SYMMETRIC 2
468 #define ALGORITHM_RIGHT_SYMMETRIC 3