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>
47 #ifdef __dietlibc__NONO
48 int strncmp(const char *s1
, const char *s2
, size_t n
) __THROW __pure__
;
49 char *strncpy(char *dest
, const char *src
, size_t n
) __THROW
;
54 #include <linux/kdev_t.h>
55 /*#include <linux/fs.h> */
56 #include <sys/mount.h>
57 #include <asm/types.h>
58 #include <sys/ioctl.h>
60 #define MdpMinorShift 6
63 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
66 #define DEFAULT_BITMAP_CHUNK 4096
67 #define DEFAULT_BITMAP_DELAY 5
68 #define DEFAULT_MAX_WRITE_BEHIND 256
75 /* #include "asm/byteorder.h" Redhat don't like this so... */
76 #if __BYTE_ORDER == __LITTLE_ENDIAN
77 # include <linux/byteorder/little_endian.h>
78 #elif __BYTE_ORDER == __BIG_ENDIAN
79 # include <linux/byteorder/big_endian.h>
80 #elif __BYTE_ORDER == __PDP_ENDIAN
81 # include <linux/byteorder/pdp_endian.h>
83 # error "unknown endianness."
88 /* general information that might be extracted from a superblock */
90 mdu_array_info_t array
;
95 unsigned long long data_offset
;
96 unsigned long long component_size
;
98 unsigned long long reshape_progress
;
99 int new_level
, delta_disks
, new_layout
, new_chunk
;
121 extern char short_options
[];
122 extern char short_bitmap_auto_options
[];
123 extern struct option long_options
[];
124 extern char Version
[], Usage
[], Help
[], OptionHelp
[],
125 Help_create
[], Help_build
[], Help_assemble
[], Help_grow
[],
126 Help_manage
[], Help_misc
[], Help_monitor
[], Help_config
[];
128 /* for option that don't have short equivilents, we assign arbitrary
129 * small numbers. '1' means an undecorated option, so we start at '2'.
131 enum special_options
{
142 /* structures read from config file */
143 /* List of mddevice names and identifiers
144 * Identifiers can be:
146 * super-minor=decimal-minor-number-from-superblock
147 * devices=comma,separated,list,of,device,names,with,wildcards
149 * If multiple fields are present, the intersection of all matching
150 * devices is considered
152 #define UnSet (0xfffe)
153 typedef struct mddev_ident_s
{
160 unsigned int super_minor
;
162 char *devices
; /* comma separated list of device
163 * names with wild cards
166 unsigned int raid_disks
;
167 unsigned int spare_disks
;
168 struct supertype
*st
;
169 int autof
; /* 1 for normal, 2 for partitioned */
174 struct mddev_ident_s
*next
;
177 /* List of device names - wildcards expanded */
178 typedef struct mddev_dev_s
{
180 char disposition
; /* 'a' for add, 'r' for remove, 'f' for fail.
181 * Not set for names read from .config
185 struct mddev_dev_s
*next
;
188 typedef struct mapping
{
199 char *pattern
; /* U or up, _ for down */
200 int percent
; /* -1 if no resync */
201 int resync
; /* 1 if resync, 0 if recovery */
202 struct mdstat_ent
*next
;
205 extern struct mdstat_ent
*mdstat_read(int hold
, int start
);
206 extern void free_mdstat(struct mdstat_ent
*ms
);
207 extern void mdstat_wait(int seconds
);
209 /* Data structure for holding info read from sysfs */
214 unsigned long long offset
, size
;
223 unsigned long long component_size
;
228 /* various details can be requested */
231 #define GET_COMPONENT 4
234 #define GET_DEVS 1024 /* gets role, major, minor */
235 #define GET_OFFSET 2048
236 #define GET_SIZE 4096
237 #define GET_STATE 8192
238 #define GET_ERROR 16384
240 /* If fd >= 0, get the array it is open on,
241 * else use devnum. >=0 -> major9. <0.....
243 extern struct sysarray
*sysfs_read(int fd
, int devnum
, unsigned long options
);
244 extern int sysfs_set_str(struct sysarray
*sra
, struct sysdev
*dev
,
245 char *name
, char *val
);
246 extern int sysfs_set_num(struct sysarray
*sra
, struct sysdev
*dev
,
247 char *name
, unsigned long long val
);
248 extern int sysfs_get_ll(struct sysarray
*sra
, struct sysdev
*dev
,
249 char *name
, unsigned long long *val
);
252 extern int save_stripes(int *source
, unsigned long long *offsets
,
253 int raid_disks
, int chunk_size
, int level
, int layout
,
254 int nwrites
, int *dest
,
255 unsigned long long start
, unsigned long long length
);
256 extern int restore_stripes(int *dest
, unsigned long long *offsets
,
257 int raid_disks
, int chunk_size
, int level
, int layout
,
258 int source
, unsigned long long read_offset
,
259 unsigned long long start
, unsigned long long length
);
262 #define Sendmail "/usr/lib/sendmail -t"
265 #define SYSLOG_FACILITY LOG_DAEMON
267 extern char *map_num(mapping_t
*map
, int num
);
268 extern int map_name(mapping_t
*map
, char *name
);
269 extern mapping_t r5layout
[], pers
[], modes
[], faultylayout
[];
271 extern char *map_dev(int major
, int minor
, int create
);
274 extern struct superswitch
{
275 void (*examine_super
)(void *sbv
);
276 void (*brief_examine_super
)(void *sbv
);
277 void (*detail_super
)(void *sbv
);
278 void (*brief_detail_super
)(void *sbv
);
279 void (*uuid_from_super
)(int uuid
[4], void *sbv
);
280 void (*getinfo_super
)(struct mdinfo
*info
, void *sbv
);
281 int (*update_super
)(struct mdinfo
*info
, void *sbv
, char *update
, char *devname
, int verbose
);
282 __u64 (*event_super
)(void *sbv
);
283 int (*init_super
)(struct supertype
*st
, void **sbp
, mdu_array_info_t
*info
, unsigned long long size
, char *name
, char *homehost
);
284 void (*add_to_super
)(void *sbv
, mdu_disk_info_t
*dinfo
);
285 int (*store_super
)(struct supertype
*st
, int fd
, void *sbv
);
286 int (*write_init_super
)(struct supertype
*st
, void *sbv
, mdu_disk_info_t
*dinfo
, char *devname
);
287 int (*compare_super
)(void **firstp
, void *secondv
);
288 int (*load_super
)(struct supertype
*st
, int fd
, void **sbp
, char *devname
);
289 struct supertype
* (*match_metadata_desc
)(char *arg
);
290 __u64 (*avail_size
)(struct supertype
*st
, __u64 size
);
291 int (*add_internal_bitmap
)(struct supertype
*st
, void *sbv
, int chunk
, int delay
, int write_behind
,
292 unsigned long long size
, int may_change
, int major
);
293 void (*locate_bitmap
)(struct supertype
*st
, int fd
, void *sbv
);
294 int (*write_bitmap
)(struct supertype
*st
, int fd
, void *sbv
);
296 int swapuuid
; /* true if uuid is bigending rather than hostendian */
297 } super0
, super1
, *superlist
[];
300 struct superswitch
*ss
;
305 extern struct supertype
*super_by_version(int vers
, int minor
);
306 extern struct supertype
*guess_super(int fd
);
322 extern int add_dev(const char *name
, const struct stat
*stb
, int flag
, struct FTW
*s
);
325 extern int Manage_ro(char *devname
, int fd
, int readonly
);
326 extern int Manage_runstop(char *devname
, int fd
, int runstop
, int quiet
);
327 extern int Manage_resize(char *devname
, int fd
, long long size
, int raid_disks
);
328 extern int Manage_reconfig(char *devname
, int fd
, int layout
);
329 extern int Manage_subdevs(char *devname
, int fd
,
330 mddev_dev_t devlist
, int verbose
);
331 extern int Grow_Add_device(char *devname
, int fd
, char *newdev
);
332 extern int Grow_addbitmap(char *devname
, int fd
, char *file
, int chunk
, int delay
, int write_behind
, int force
);
333 extern int Grow_reshape(char *devname
, int fd
, int quiet
, char *backup_file
,
335 int level
, int layout
, int chunksize
, int raid_disks
);
336 extern int Grow_restart(struct supertype
*st
, struct mdinfo
*info
,
337 int *fdlist
, int cnt
, char *backup_file
);
340 extern int Assemble(struct supertype
*st
, char *mddev
, int mdfd
,
343 mddev_dev_t devlist
, char *backup_file
,
344 int readonly
, int runstop
,
346 int verbose
, int force
);
348 extern int Build(char *mddev
, int mdfd
, int chunk
, int level
, int layout
,
350 mddev_dev_t devlist
, int assume_clean
,
351 char *bitmap_file
, int bitmap_chunk
, int write_behind
, int delay
, int verbose
);
354 extern int Create(struct supertype
*st
, char *mddev
, int mdfd
,
355 int chunk
, int level
, int layout
, unsigned long long size
, int raiddisks
, int sparedisks
,
356 char *name
, char *homehost
,
357 int subdevs
, mddev_dev_t devlist
,
358 int runstop
, int verbose
, int force
, int assume_clean
,
359 char *bitmap_file
, int bitmap_chunk
, int write_behind
, int delay
);
361 extern int Detail(char *dev
, int brief
, int test
);
362 extern int Query(char *dev
);
363 extern int Examine(mddev_dev_t devlist
, int brief
, int scan
, int SparcAdjust
,
364 struct supertype
*forcest
);
365 extern int Monitor(mddev_dev_t devlist
,
366 char *mailaddr
, char *alert_cmd
,
367 int period
, int daemonise
, int scan
, int oneshot
,
368 int dosyslog
, char *config
, int test
, char *pidfile
);
370 extern int Kill(char *dev
, int force
, int quiet
);
372 extern int CreateBitmap(char *filename
, int force
, char uuid
[16],
373 unsigned long chunksize
, unsigned long daemon_sleep
,
374 unsigned long write_behind
,
375 unsigned long long array_size
,
377 extern int ExamineBitmap(char *filename
, int brief
, struct supertype
*st
);
378 extern void bitmap_update_uuid(int fd
, int *uuid
);
380 extern int md_get_version(int fd
);
381 extern int get_linux_version(void);
382 extern int parse_uuid(char *str
, int uuid
[4]);
383 extern int check_ext2(int fd
, char *name
);
384 extern int check_reiser(int fd
, char *name
);
385 extern int check_raid(int fd
, char *name
);
387 extern int get_mdp_major(void);
388 extern int dev_open(char *dev
, int flags
);
389 extern int is_standard(char *dev
, int *nump
);
391 extern int parse_auto(char *str
, char *msg
, int config
);
392 extern mddev_ident_t
conf_get_ident(char *conffile
, char *dev
);
393 extern mddev_dev_t
conf_get_devs(char *conffile
);
394 extern struct createinfo
*conf_get_create_info(char *conffile
);
395 extern char *conf_get_mailaddr(char *conffile
);
396 extern char *conf_get_mailfrom(char *conffile
);
397 extern char *conf_get_program(char *conffile
);
398 extern char *conf_get_homehost(char *conffile
);
399 extern char *conf_line(FILE *file
);
400 extern char *conf_word(FILE *file
, int allow_key
);
401 extern void free_line(char *line
);
402 extern int match_oneof(char *devices
, char *devname
);
403 extern void uuid_from_super(int uuid
[4], mdp_super_t
*super
);
404 extern int same_uuid(int a
[4], int b
[4], int swapuuid
);
405 /* extern int compare_super(mdp_super_t *first, mdp_super_t *second);*/
406 extern unsigned long calc_csum(void *super
, int bytes
);
407 extern int enough(int level
, int raid_disks
, int layout
,
408 char *avail
, int avail_disks
);
409 extern int ask(char *mesg
);
410 extern unsigned long long get_component_size(int fd
);
413 extern char *human_size(long long bytes
);
414 char *human_size_brief(long long bytes
);
416 extern void put_md_name(char *name
);
417 extern char *get_md_name(int dev
);
419 extern char DefaultConfFile
[];
421 extern int open_mddev(char *dev
, int autof
);
424 #define LEVEL_MULTIPATH (-4)
425 #define LEVEL_LINEAR (-1)
426 #define LEVEL_FAULTY (-5)
431 #define WriteTransient 0
432 #define ReadTransient 1
433 #define WritePersistent 2
434 #define ReadPersistent 3
435 #define WriteAll 4 /* doesn't go to device */
436 #define ReadFixable 5
439 #define ClearErrors 31
440 #define ClearFaults 30
442 #define AllPersist 100 /* internal use only */
443 #define NoPersist 101
445 #define ModeMask 0x1f
453 #define minor(x) ((x)&0xff)
454 #define major(x) (((x)>>8)&0xff)
455 #define makedev(M,m) (((M)<<8) | (m))
459 #define ALGORITHM_LEFT_ASYMMETRIC 0
460 #define ALGORITHM_RIGHT_ASYMMETRIC 1
461 #define ALGORITHM_LEFT_SYMMETRIC 2
462 #define ALGORITHM_RIGHT_SYMMETRIC 3