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
77 /* Redhat don't like to #include <asm/byteorder.h>, and
78 * some time include <linux/byteorder/xxx_endian.h> isn't enough,
79 * and there is no standard conversion function so... */
80 #if BYTE_ORDER == LITTLE_ENDIAN
81 #define __cpu_to_le16(_x) (_x)
82 #define __cpu_to_le32(_x) (_x)
83 #define __cpu_to_le64(_x) (_x)
84 #define __le16_to_cpu(_x) (_x)
85 #define __le32_to_cpu(_x) (_x)
86 #define __le64_to_cpu(_x) (_x)
87 #elif BYTE_ORDER == BIG_ENDIAN
88 #define __cpu_to_le16(_x) bswap_16(_x)
89 #define __cpu_to_le32(_x) bswap_32(_x)
90 #define __cpu_to_le64(_x) bswap_64(_x)
91 #define __le16_to_cpu(_x) bswap_16(_x)
92 #define __le32_to_cpu(_x) bswap_32(_x)
93 #define __le64_to_cpu(_x) bswap_64(_x)
95 # error "unknown endianness."
100 /* general information that might be extracted from a superblock */
102 mdu_array_info_t array
;
103 mdu_disk_info_t disk
;
107 unsigned long long data_offset
;
108 unsigned long long component_size
;
110 unsigned long long reshape_progress
;
111 int new_level
, delta_disks
, new_layout
, new_chunk
;
133 extern char short_options
[];
134 extern char short_bitmap_auto_options
[];
135 extern struct option long_options
[];
136 extern char Version
[], Usage
[], Help
[], OptionHelp
[],
137 Help_create
[], Help_build
[], Help_assemble
[], Help_grow
[],
138 Help_manage
[], Help_misc
[], Help_monitor
[], Help_config
[];
140 /* for option that don't have short equivilents, we assign arbitrary
141 * small numbers. '1' means an undecorated option, so we start at '2'.
143 enum special_options
{
155 /* structures read from config file */
156 /* List of mddevice names and identifiers
157 * Identifiers can be:
159 * super-minor=decimal-minor-number-from-superblock
160 * devices=comma,separated,list,of,device,names,with,wildcards
162 * If multiple fields are present, the intersection of all matching
163 * devices is considered
165 #define UnSet (0xfffe)
166 typedef struct mddev_ident_s
{
173 unsigned int super_minor
;
175 char *devices
; /* comma separated list of device
176 * names with wild cards
179 unsigned int raid_disks
;
180 unsigned int spare_disks
;
181 struct supertype
*st
;
182 int autof
; /* 1 for normal, 2 for partitioned */
187 struct mddev_ident_s
*next
;
190 /* List of device names - wildcards expanded */
191 typedef struct mddev_dev_s
{
193 char disposition
; /* 'a' for add, 'r' for remove, 'f' for fail.
194 * Not set for names read from .config
198 char used
; /* set when used */
199 struct mddev_dev_s
*next
;
202 typedef struct mapping
{
213 char *pattern
; /* U or up, _ for down */
214 int percent
; /* -1 if no resync */
215 int resync
; /* 1 if resync, 0 if recovery */
216 struct mdstat_ent
*next
;
219 extern struct mdstat_ent
*mdstat_read(int hold
, int start
);
220 extern void free_mdstat(struct mdstat_ent
*ms
);
221 extern void mdstat_wait(int seconds
);
223 /* Data structure for holding info read from sysfs */
228 unsigned long long offset
, size
;
237 unsigned long long component_size
;
242 /* various details can be requested */
245 #define GET_COMPONENT 4
248 #define GET_DEVS 1024 /* gets role, major, minor */
249 #define GET_OFFSET 2048
250 #define GET_SIZE 4096
251 #define GET_STATE 8192
252 #define GET_ERROR 16384
254 /* If fd >= 0, get the array it is open on,
255 * else use devnum. >=0 -> major9. <0.....
257 extern struct sysarray
*sysfs_read(int fd
, int devnum
, unsigned long options
);
258 extern int sysfs_set_str(struct sysarray
*sra
, struct sysdev
*dev
,
259 char *name
, char *val
);
260 extern int sysfs_set_num(struct sysarray
*sra
, struct sysdev
*dev
,
261 char *name
, unsigned long long val
);
262 extern int sysfs_get_ll(struct sysarray
*sra
, struct sysdev
*dev
,
263 char *name
, unsigned long long *val
);
266 extern int save_stripes(int *source
, unsigned long long *offsets
,
267 int raid_disks
, int chunk_size
, int level
, int layout
,
268 int nwrites
, int *dest
,
269 unsigned long long start
, unsigned long long length
);
270 extern int restore_stripes(int *dest
, unsigned long long *offsets
,
271 int raid_disks
, int chunk_size
, int level
, int layout
,
272 int source
, unsigned long long read_offset
,
273 unsigned long long start
, unsigned long long length
);
276 #define Sendmail "/usr/lib/sendmail -t"
279 #define SYSLOG_FACILITY LOG_DAEMON
281 extern char *map_num(mapping_t
*map
, int num
);
282 extern int map_name(mapping_t
*map
, char *name
);
283 extern mapping_t r5layout
[], pers
[], modes
[], faultylayout
[];
285 extern char *map_dev(int major
, int minor
, int create
);
288 extern struct superswitch
{
289 void (*examine_super
)(void *sbv
, char *homehost
);
290 void (*brief_examine_super
)(void *sbv
);
291 void (*detail_super
)(void *sbv
, char *homehost
);
292 void (*brief_detail_super
)(void *sbv
);
293 void (*uuid_from_super
)(int uuid
[4], void *sbv
);
294 void (*getinfo_super
)(struct mdinfo
*info
, void *sbv
);
295 int (*match_home
)(void *sbv
, char *homehost
);
296 int (*update_super
)(struct mdinfo
*info
, void *sbv
, char *update
,
297 char *devname
, int verbose
,
298 int uuid_set
, char *homehost
);
299 __u64 (*event_super
)(void *sbv
);
300 int (*init_super
)(struct supertype
*st
, void **sbp
, mdu_array_info_t
*info
, unsigned long long size
, char *name
, char *homehost
);
301 void (*add_to_super
)(void *sbv
, mdu_disk_info_t
*dinfo
);
302 int (*store_super
)(struct supertype
*st
, int fd
, void *sbv
);
303 int (*write_init_super
)(struct supertype
*st
, void *sbv
, mdu_disk_info_t
*dinfo
, char *devname
);
304 int (*compare_super
)(void **firstp
, void *secondv
);
305 int (*load_super
)(struct supertype
*st
, int fd
, void **sbp
, char *devname
);
306 struct supertype
* (*match_metadata_desc
)(char *arg
);
307 __u64 (*avail_size
)(struct supertype
*st
, __u64 size
);
308 int (*add_internal_bitmap
)(struct supertype
*st
, void *sbv
, int chunk
, int delay
, int write_behind
,
309 unsigned long long size
, int may_change
, int major
);
310 void (*locate_bitmap
)(struct supertype
*st
, int fd
, void *sbv
);
311 int (*write_bitmap
)(struct supertype
*st
, int fd
, void *sbv
);
313 int swapuuid
; /* true if uuid is bigending rather than hostendian */
314 } super0
, super1
, *superlist
[];
317 struct superswitch
*ss
;
322 extern struct supertype
*super_by_version(int vers
, int minor
);
323 extern struct supertype
*guess_super(int fd
);
339 extern int add_dev(const char *name
, const struct stat
*stb
, int flag
, struct FTW
*s
);
342 extern int Manage_ro(char *devname
, int fd
, int readonly
);
343 extern int Manage_runstop(char *devname
, int fd
, int runstop
, int quiet
);
344 extern int Manage_resize(char *devname
, int fd
, long long size
, int raid_disks
);
345 extern int Manage_reconfig(char *devname
, int fd
, int layout
);
346 extern int Manage_subdevs(char *devname
, int fd
,
347 mddev_dev_t devlist
, int verbose
);
348 extern int Grow_Add_device(char *devname
, int fd
, char *newdev
);
349 extern int Grow_addbitmap(char *devname
, int fd
, char *file
, int chunk
, int delay
, int write_behind
, int force
);
350 extern int Grow_reshape(char *devname
, int fd
, int quiet
, char *backup_file
,
352 int level
, int layout
, int chunksize
, int raid_disks
);
353 extern int Grow_restart(struct supertype
*st
, struct mdinfo
*info
,
354 int *fdlist
, int cnt
, char *backup_file
);
357 extern int Assemble(struct supertype
*st
, char *mddev
, int mdfd
,
360 mddev_dev_t devlist
, char *backup_file
,
361 int readonly
, int runstop
,
362 char *update
, char *homehost
,
363 int verbose
, int force
);
365 extern int Build(char *mddev
, int mdfd
, int chunk
, int level
, int layout
,
367 mddev_dev_t devlist
, int assume_clean
,
368 char *bitmap_file
, int bitmap_chunk
, int write_behind
, int delay
, int verbose
);
371 extern int Create(struct supertype
*st
, char *mddev
, int mdfd
,
372 int chunk
, int level
, int layout
, unsigned long long size
, int raiddisks
, int sparedisks
,
373 char *name
, char *homehost
,
374 int subdevs
, mddev_dev_t devlist
,
375 int runstop
, int verbose
, int force
, int assume_clean
,
376 char *bitmap_file
, int bitmap_chunk
, int write_behind
, int delay
);
378 extern int Detail(char *dev
, int brief
, int test
, char *homehost
);
379 extern int Query(char *dev
);
380 extern int Examine(mddev_dev_t devlist
, int brief
, int scan
, int SparcAdjust
,
381 struct supertype
*forcest
, char *homehost
);
382 extern int Monitor(mddev_dev_t devlist
,
383 char *mailaddr
, char *alert_cmd
,
384 int period
, int daemonise
, int scan
, int oneshot
,
385 int dosyslog
, char *config
, int test
, char *pidfile
);
387 extern int Kill(char *dev
, int force
, int quiet
);
389 extern int CreateBitmap(char *filename
, int force
, char uuid
[16],
390 unsigned long chunksize
, unsigned long daemon_sleep
,
391 unsigned long write_behind
,
392 unsigned long long array_size
,
394 extern int ExamineBitmap(char *filename
, int brief
, struct supertype
*st
);
395 extern int bitmap_update_uuid(int fd
, int *uuid
);
397 extern int md_get_version(int fd
);
398 extern int get_linux_version(void);
399 extern int parse_uuid(char *str
, int uuid
[4]);
400 extern int check_ext2(int fd
, char *name
);
401 extern int check_reiser(int fd
, char *name
);
402 extern int check_raid(int fd
, char *name
);
404 extern int get_mdp_major(void);
405 extern int dev_open(char *dev
, int flags
);
406 extern int is_standard(char *dev
, int *nump
);
408 extern int parse_auto(char *str
, char *msg
, int config
);
409 extern mddev_ident_t
conf_get_ident(char *conffile
, char *dev
);
410 extern mddev_dev_t
conf_get_devs(char *conffile
);
411 extern struct createinfo
*conf_get_create_info(char *conffile
);
412 extern char *conf_get_mailaddr(char *conffile
);
413 extern char *conf_get_mailfrom(char *conffile
);
414 extern char *conf_get_program(char *conffile
);
415 extern char *conf_get_homehost(char *conffile
);
416 extern char *conf_line(FILE *file
);
417 extern char *conf_word(FILE *file
, int allow_key
);
418 extern void free_line(char *line
);
419 extern int match_oneof(char *devices
, char *devname
);
420 extern void uuid_from_super(int uuid
[4], mdp_super_t
*super
);
421 extern int same_uuid(int a
[4], int b
[4], int swapuuid
);
422 /* extern int compare_super(mdp_super_t *first, mdp_super_t *second);*/
423 extern unsigned long calc_csum(void *super
, int bytes
);
424 extern int enough(int level
, int raid_disks
, int layout
,
425 char *avail
, int avail_disks
);
426 extern int ask(char *mesg
);
427 extern unsigned long long get_component_size(int fd
);
430 extern char *human_size(long long bytes
);
431 char *human_size_brief(long long bytes
);
433 extern void put_md_name(char *name
);
434 extern char *get_md_name(int dev
);
436 extern char DefaultConfFile
[];
438 extern int open_mddev(char *dev
, int autof
);
441 #define LEVEL_MULTIPATH (-4)
442 #define LEVEL_LINEAR (-1)
443 #define LEVEL_FAULTY (-5)
448 #define WriteTransient 0
449 #define ReadTransient 1
450 #define WritePersistent 2
451 #define ReadPersistent 3
452 #define WriteAll 4 /* doesn't go to device */
453 #define ReadFixable 5
456 #define ClearErrors 31
457 #define ClearFaults 30
459 #define AllPersist 100 /* internal use only */
460 #define NoPersist 101
462 #define ModeMask 0x1f
470 #define minor(x) ((x)&0xff)
471 #define major(x) (((x)>>8)&0xff)
472 #define makedev(M,m) (((M)<<8) | (m))
476 #define ALGORITHM_LEFT_ASYMMETRIC 0
477 #define ALGORITHM_RIGHT_ASYMMETRIC 1
478 #define ALGORITHM_LEFT_SYMMETRIC 2
479 #define ALGORITHM_RIGHT_SYMMETRIC 3