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 /* Redhat don't like to #include <asm/byteorder.h>, and
77 * some time include <linux/byteorder/xxx_endian.h> isn't enough,
78 * and there is no standard conversion function so... */
79 /* And dietlibc doesn't think byteswap is ok, so.. */
80 /* #include <byteswap.h> */
81 #define bswap_16(x) (((x) & 0x00ffU) << 8 | \
83 #define bswap_32(x) (((x) & 0x000000ffU) << 24 | \
84 ((x) & 0xff000000U) >> 24 | \
85 ((x) & 0x0000ff00U) << 8 | \
86 ((x) & 0x00ff0000U) >> 8)
87 #define bswap_64(x) (((x) & 0x00000000000000ffULL) << 56 | \
88 ((x) & 0xff00000000000000ULL) >> 56 | \
89 ((x) & 0x000000000000ff00ULL) << 40 | \
90 ((x) & 0x00ff000000000000ULL) >> 40 | \
91 ((x) & 0x0000000000ff0000ULL) << 24 | \
92 ((x) & 0x0000ff0000000000ULL) >> 24 | \
93 ((x) & 0x00000000ff000000ULL) << 8 | \
94 ((x) & 0x000000ff00000000ULL) >> 8)
96 #if BYTE_ORDER == LITTLE_ENDIAN
97 #define __cpu_to_le16(_x) (_x)
98 #define __cpu_to_le32(_x) (_x)
99 #define __cpu_to_le64(_x) (_x)
100 #define __le16_to_cpu(_x) (_x)
101 #define __le32_to_cpu(_x) (_x)
102 #define __le64_to_cpu(_x) (_x)
103 #elif BYTE_ORDER == BIG_ENDIAN
104 #define __cpu_to_le16(_x) bswap_16(_x)
105 #define __cpu_to_le32(_x) bswap_32(_x)
106 #define __cpu_to_le64(_x) bswap_64(_x)
107 #define __le16_to_cpu(_x) bswap_16(_x)
108 #define __le32_to_cpu(_x) bswap_32(_x)
109 #define __le64_to_cpu(_x) bswap_64(_x)
111 # error "unknown endianness."
116 /* general information that might be extracted from a superblock */
118 mdu_array_info_t array
;
119 mdu_disk_info_t disk
;
123 unsigned long long data_offset
;
124 unsigned long long component_size
;
126 unsigned long long reshape_progress
;
127 int new_level
, delta_disks
, new_layout
, new_chunk
;
135 struct supertype
*supertype
;
150 extern char short_options
[];
151 extern char short_bitmap_auto_options
[];
152 extern struct option long_options
[];
153 extern char Version
[], Usage
[], Help
[], OptionHelp
[],
154 Help_create
[], Help_build
[], Help_assemble
[], Help_grow
[],
155 Help_manage
[], Help_misc
[], Help_monitor
[], Help_config
[];
157 /* for option that don't have short equivilents, we assign arbitrary
158 * small numbers. '1' means an undecorated option, so we start at '2'.
160 enum special_options
{
172 /* structures read from config file */
173 /* List of mddevice names and identifiers
174 * Identifiers can be:
176 * super-minor=decimal-minor-number-from-superblock
177 * devices=comma,separated,list,of,device,names,with,wildcards
179 * If multiple fields are present, the intersection of all matching
180 * devices is considered
182 #define UnSet (0xfffe)
183 typedef struct mddev_ident_s
{
190 unsigned int super_minor
;
192 char *devices
; /* comma separated list of device
193 * names with wild cards
196 unsigned int raid_disks
;
197 unsigned int spare_disks
;
198 struct supertype
*st
;
199 int autof
; /* 1 for normal, 2 for partitioned */
204 struct mddev_ident_s
*next
;
207 /* List of device names - wildcards expanded */
208 typedef struct mddev_dev_s
{
210 char disposition
; /* 'a' for add, 'r' for remove, 'f' for fail.
211 * Not set for names read from .config
215 char used
; /* set when used */
216 struct mddev_dev_s
*next
;
219 typedef struct mapping
{
230 char *pattern
; /* U or up, _ for down */
231 int percent
; /* -1 if no resync */
232 int resync
; /* 1 if resync, 0 if recovery */
233 struct mdstat_ent
*next
;
236 extern struct mdstat_ent
*mdstat_read(int hold
, int start
);
237 extern void free_mdstat(struct mdstat_ent
*ms
);
238 extern void mdstat_wait(int seconds
);
240 /* Data structure for holding info read from sysfs */
245 unsigned long long offset
, size
;
254 unsigned long long component_size
;
259 /* various details can be requested */
262 #define GET_COMPONENT 4
265 #define GET_DEVS 1024 /* gets role, major, minor */
266 #define GET_OFFSET 2048
267 #define GET_SIZE 4096
268 #define GET_STATE 8192
269 #define GET_ERROR 16384
271 /* If fd >= 0, get the array it is open on,
272 * else use devnum. >=0 -> major9. <0.....
274 extern struct sysarray
*sysfs_read(int fd
, int devnum
, unsigned long options
);
275 extern int sysfs_set_str(struct sysarray
*sra
, struct sysdev
*dev
,
276 char *name
, char *val
);
277 extern int sysfs_set_num(struct sysarray
*sra
, struct sysdev
*dev
,
278 char *name
, unsigned long long val
);
279 extern int sysfs_get_ll(struct sysarray
*sra
, struct sysdev
*dev
,
280 char *name
, unsigned long long *val
);
283 extern int save_stripes(int *source
, unsigned long long *offsets
,
284 int raid_disks
, int chunk_size
, int level
, int layout
,
285 int nwrites
, int *dest
,
286 unsigned long long start
, unsigned long long length
);
287 extern int restore_stripes(int *dest
, unsigned long long *offsets
,
288 int raid_disks
, int chunk_size
, int level
, int layout
,
289 int source
, unsigned long long read_offset
,
290 unsigned long long start
, unsigned long long length
);
293 #define Sendmail "/usr/lib/sendmail -t"
296 #define SYSLOG_FACILITY LOG_DAEMON
298 extern char *map_num(mapping_t
*map
, int num
);
299 extern int map_name(mapping_t
*map
, char *name
);
300 extern mapping_t r5layout
[], pers
[], modes
[], faultylayout
[];
302 extern char *map_dev(int major
, int minor
, int create
);
305 extern struct superswitch
{
306 void (*examine_super
)(void *sbv
, char *homehost
);
307 void (*brief_examine_super
)(void *sbv
);
308 void (*detail_super
)(void *sbv
, char *homehost
);
309 void (*brief_detail_super
)(void *sbv
);
310 void (*uuid_from_super
)(int uuid
[4], void *sbv
);
311 void (*getinfo_super
)(struct mdinfo
*info
, void *sbv
);
312 int (*match_home
)(void *sbv
, char *homehost
);
313 int (*update_super
)(struct mdinfo
*info
, void *sbv
, char *update
,
314 char *devname
, int verbose
,
315 int uuid_set
, char *homehost
);
316 __u64 (*event_super
)(void *sbv
);
317 int (*init_super
)(struct supertype
*st
, void **sbp
, mdu_array_info_t
*info
, unsigned long long size
, char *name
, char *homehost
);
318 void (*add_to_super
)(void *sbv
, mdu_disk_info_t
*dinfo
);
319 int (*store_super
)(struct supertype
*st
, int fd
, void *sbv
);
320 int (*write_init_super
)(struct supertype
*st
, void *sbv
, mdu_disk_info_t
*dinfo
, char *devname
);
321 int (*compare_super
)(void **firstp
, void *secondv
);
322 int (*load_super
)(struct supertype
*st
, int fd
, void **sbp
, char *devname
);
323 struct supertype
* (*match_metadata_desc
)(char *arg
);
324 __u64 (*avail_size
)(struct supertype
*st
, __u64 size
);
325 int (*add_internal_bitmap
)(struct supertype
*st
, void *sbv
, int chunk
, int delay
, int write_behind
,
326 unsigned long long size
, int may_change
, int major
);
327 void (*locate_bitmap
)(struct supertype
*st
, int fd
, void *sbv
);
328 int (*write_bitmap
)(struct supertype
*st
, int fd
, void *sbv
);
330 int swapuuid
; /* true if uuid is bigending rather than hostendian */
331 } super0
, super1
, *superlist
[];
334 struct superswitch
*ss
;
339 extern struct supertype
*super_by_version(int vers
, int minor
);
340 extern struct supertype
*guess_super(int fd
);
356 extern int add_dev(const char *name
, const struct stat
*stb
, int flag
, struct FTW
*s
);
359 extern int Manage_ro(char *devname
, int fd
, int readonly
);
360 extern int Manage_runstop(char *devname
, int fd
, int runstop
, int quiet
);
361 extern int Manage_resize(char *devname
, int fd
, long long size
, int raid_disks
);
362 extern int Manage_reconfig(char *devname
, int fd
, int layout
);
363 extern int Manage_subdevs(char *devname
, int fd
,
364 mddev_dev_t devlist
, int verbose
);
365 extern int Grow_Add_device(char *devname
, int fd
, char *newdev
);
366 extern int Grow_addbitmap(char *devname
, int fd
, char *file
, int chunk
, int delay
, int write_behind
, int force
);
367 extern int Grow_reshape(char *devname
, int fd
, int quiet
, char *backup_file
,
369 int level
, int layout
, int chunksize
, int raid_disks
);
370 extern int Grow_restart(struct supertype
*st
, struct mdinfo
*info
,
371 int *fdlist
, int cnt
, char *backup_file
);
374 extern int Assemble(struct supertype
*st
, char *mddev
, int mdfd
,
377 mddev_dev_t devlist
, char *backup_file
,
378 int readonly
, int runstop
,
379 char *update
, char *homehost
,
380 int verbose
, int force
);
382 extern int Build(char *mddev
, int mdfd
, int chunk
, int level
, int layout
,
384 mddev_dev_t devlist
, int assume_clean
,
385 char *bitmap_file
, int bitmap_chunk
, int write_behind
, int delay
, int verbose
);
388 extern int Create(struct supertype
*st
, char *mddev
, int mdfd
,
389 int chunk
, int level
, int layout
, unsigned long long size
, int raiddisks
, int sparedisks
,
390 char *name
, char *homehost
,
391 int subdevs
, mddev_dev_t devlist
,
392 int runstop
, int verbose
, int force
, int assume_clean
,
393 char *bitmap_file
, int bitmap_chunk
, int write_behind
, int delay
);
395 extern int Detail(char *dev
, int brief
, int test
, char *homehost
);
396 extern int Query(char *dev
);
397 extern int Examine(mddev_dev_t devlist
, int brief
, int scan
, int SparcAdjust
,
398 struct supertype
*forcest
, char *homehost
);
399 extern int Monitor(mddev_dev_t devlist
,
400 char *mailaddr
, char *alert_cmd
,
401 int period
, int daemonise
, int scan
, int oneshot
,
402 int dosyslog
, char *config
, int test
, char *pidfile
);
404 extern int Kill(char *dev
, int force
, int quiet
);
406 extern int CreateBitmap(char *filename
, int force
, char uuid
[16],
407 unsigned long chunksize
, unsigned long daemon_sleep
,
408 unsigned long write_behind
,
409 unsigned long long array_size
,
411 extern int ExamineBitmap(char *filename
, int brief
, struct supertype
*st
);
412 extern int bitmap_update_uuid(int fd
, int *uuid
);
414 extern int md_get_version(int fd
);
415 extern int get_linux_version(void);
416 extern int parse_uuid(char *str
, int uuid
[4]);
417 extern int check_ext2(int fd
, char *name
);
418 extern int check_reiser(int fd
, char *name
);
419 extern int check_raid(int fd
, char *name
);
421 extern int get_mdp_major(void);
422 extern int dev_open(char *dev
, int flags
);
423 extern int is_standard(char *dev
, int *nump
);
425 extern int parse_auto(char *str
, char *msg
, int config
);
426 extern mddev_ident_t
conf_get_ident(char *conffile
, char *dev
);
427 extern mddev_dev_t
conf_get_devs(char *conffile
);
428 extern struct createinfo
*conf_get_create_info(char *conffile
);
429 extern char *conf_get_mailaddr(char *conffile
);
430 extern char *conf_get_mailfrom(char *conffile
);
431 extern char *conf_get_program(char *conffile
);
432 extern char *conf_get_homehost(char *conffile
);
433 extern char *conf_line(FILE *file
);
434 extern char *conf_word(FILE *file
, int allow_key
);
435 extern void free_line(char *line
);
436 extern int match_oneof(char *devices
, char *devname
);
437 extern void uuid_from_super(int uuid
[4], mdp_super_t
*super
);
438 extern int same_uuid(int a
[4], int b
[4], int swapuuid
);
439 /* extern int compare_super(mdp_super_t *first, mdp_super_t *second);*/
440 extern unsigned long calc_csum(void *super
, int bytes
);
441 extern int enough(int level
, int raid_disks
, int layout
,
442 char *avail
, int avail_disks
);
443 extern int ask(char *mesg
);
444 extern unsigned long long get_component_size(int fd
);
447 extern char *human_size(long long bytes
);
448 char *human_size_brief(long long bytes
);
450 extern void put_md_name(char *name
);
451 extern char *get_md_name(int dev
);
453 extern char DefaultConfFile
[];
455 extern int open_mddev(char *dev
, int autof
);
458 #define LEVEL_MULTIPATH (-4)
459 #define LEVEL_LINEAR (-1)
460 #define LEVEL_FAULTY (-5)
465 #define WriteTransient 0
466 #define ReadTransient 1
467 #define WritePersistent 2
468 #define ReadPersistent 3
469 #define WriteAll 4 /* doesn't go to device */
470 #define ReadFixable 5
473 #define ClearErrors 31
474 #define ClearFaults 30
476 #define AllPersist 100 /* internal use only */
477 #define NoPersist 101
479 #define ModeMask 0x1f
487 #define minor(x) ((x)&0xff)
488 #define major(x) (((x)>>8)&0xff)
489 #define makedev(M,m) (((M)<<8) | (m))
493 #define ALGORITHM_LEFT_ASYMMETRIC 0
494 #define ALGORITHM_RIGHT_ASYMMETRIC 1
495 #define ALGORITHM_LEFT_SYMMETRIC 2
496 #define ALGORITHM_RIGHT_SYMMETRIC 3