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Allow an externally managed array to be marked readonly
[thirdparty/mdadm.git] / mdadm.h
1 /*
2 * mdadm - manage Linux "md" devices aka RAID arrays.
3 *
4 * Copyright (C) 2001-2006 Neil Brown <neilb@suse.de>
5 *
6 *
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.
11 *
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.
16 *
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
20 *
21 * Author: Neil Brown
22 * Email: <neilb@cse.unsw.edu.au>
23 * Paper: Neil Brown
24 * School of Computer Science and Engineering
25 * The University of New South Wales
26 * Sydney, 2052
27 * Australia
28 */
29
30 #define _GNU_SOURCE
31 #define _FILE_OFFSET_BITS 64
32 #include <unistd.h>
33 #if !defined(__dietlibc__) && !defined(__KLIBC__)
34 extern __off64_t lseek64 __P ((int __fd, __off64_t __offset, int __whence));
35 #else
36 # if defined(__NO_STAT64) || __WORDSIZE != 32
37 # define lseek64 lseek
38 # endif
39 #endif
40
41 #include <sys/types.h>
42 #include <sys/stat.h>
43 #include <stdlib.h>
44 #include <time.h>
45 #include <sys/time.h>
46 #include <getopt.h>
47 #include <fcntl.h>
48 #include <stdio.h>
49 #include <errno.h>
50 #include <string.h>
51 #include <syslog.h>
52 #ifdef __dietlibc__
53 #include <strings.h>
54 /* dietlibc has deprecated random and srandom!! */
55 #define random rand
56 #define srandom srand
57 #endif
58
59
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>
65 #define MD_MAJOR 9
66 #define MdpMinorShift 6
67
68 #ifndef BLKGETSIZE64
69 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
70 #endif
71
72 #define DEFAULT_BITMAP_CHUNK 4096
73 #define DEFAULT_BITMAP_DELAY 5
74 #define DEFAULT_MAX_WRITE_BEHIND 256
75
76 #include "md_u.h"
77 #include "md_p.h"
78 #include "bitmap.h"
79 #include "msg.h"
80
81 #include <endian.h>
82 /* Redhat don't like to #include <asm/byteorder.h>, and
83 * some time include <linux/byteorder/xxx_endian.h> isn't enough,
84 * and there is no standard conversion function so... */
85 /* And dietlibc doesn't think byteswap is ok, so.. */
86 /* #include <byteswap.h> */
87 #define bswap_16(x) (((x) & 0x00ffU) << 8 | \
88 ((x) & 0xff00U) >> 8)
89 #define bswap_32(x) (((x) & 0x000000ffU) << 24 | \
90 ((x) & 0xff000000U) >> 24 | \
91 ((x) & 0x0000ff00U) << 8 | \
92 ((x) & 0x00ff0000U) >> 8)
93 #define bswap_64(x) (((x) & 0x00000000000000ffULL) << 56 | \
94 ((x) & 0xff00000000000000ULL) >> 56 | \
95 ((x) & 0x000000000000ff00ULL) << 40 | \
96 ((x) & 0x00ff000000000000ULL) >> 40 | \
97 ((x) & 0x0000000000ff0000ULL) << 24 | \
98 ((x) & 0x0000ff0000000000ULL) >> 24 | \
99 ((x) & 0x00000000ff000000ULL) << 8 | \
100 ((x) & 0x000000ff00000000ULL) >> 8)
101
102 #if !defined(__KLIBC__)
103 #if BYTE_ORDER == LITTLE_ENDIAN
104 #define __cpu_to_le16(_x) (_x)
105 #define __cpu_to_le32(_x) (_x)
106 #define __cpu_to_le64(_x) (_x)
107 #define __le16_to_cpu(_x) (_x)
108 #define __le32_to_cpu(_x) (_x)
109 #define __le64_to_cpu(_x) (_x)
110
111 #define __cpu_to_be16(_x) bswap_16(_x)
112 #define __cpu_to_be32(_x) bswap_32(_x)
113 #define __cpu_to_be64(_x) bswap_64(_x)
114 #define __be16_to_cpu(_x) bswap_16(_x)
115 #define __be32_to_cpu(_x) bswap_32(_x)
116 #define __be64_to_cpu(_x) bswap_64(_x)
117 #elif BYTE_ORDER == BIG_ENDIAN
118 #define __cpu_to_le16(_x) bswap_16(_x)
119 #define __cpu_to_le32(_x) bswap_32(_x)
120 #define __cpu_to_le64(_x) bswap_64(_x)
121 #define __le16_to_cpu(_x) bswap_16(_x)
122 #define __le32_to_cpu(_x) bswap_32(_x)
123 #define __le64_to_cpu(_x) bswap_64(_x)
124
125 #define __cpu_to_be16(_x) (_x)
126 #define __cpu_to_be32(_x) (_x)
127 #define __cpu_to_be64(_x) (_x)
128 #define __be16_to_cpu(_x) (_x)
129 #define __be32_to_cpu(_x) (_x)
130 #define __be64_to_cpu(_x) (_x)
131 #else
132 # error "unknown endianness."
133 #endif
134 #endif /* __KLIBC__ */
135
136
137
138 /* general information that might be extracted from a superblock */
139 struct mdinfo {
140 mdu_array_info_t array;
141 mdu_disk_info_t disk;
142 __u64 events;
143 int uuid[4];
144 char name[33];
145 unsigned long long data_offset;
146 unsigned long long component_size; /* same as array.size, except in
147 * sectors and up to 64bits.
148 */
149 int reshape_active;
150 unsigned long long reshape_progress;
151 unsigned long long resync_start;
152 int new_level, delta_disks, new_layout, new_chunk;
153 int errors;
154 int cache_size; /* size of raid456 stripe cache*/
155 int mismatch_cnt;
156 char text_version[50];
157
158 int container_member; /* for assembling external-metatdata arrays
159 * This is to be used internally by metadata
160 * handler only */
161
162 char sys_name[20];
163 struct mdinfo *devs;
164 struct mdinfo *next;
165
166 /* Device info for mdmon: */
167 int state_fd;
168 #define DS_FAULTY 1
169 #define DS_INSYNC 2
170 #define DS_WRITE_MOSTLY 4
171 #define DS_SPARE 8
172 #define DS_BLOCKED 16
173 #define DS_REMOVE 1024
174 #define DS_UNBLOCK 2048
175 int prev_state, curr_state, next_state;
176
177 };
178
179 struct createinfo {
180 int uid;
181 int gid;
182 int autof;
183 int mode;
184 int symlinks;
185 struct supertype *supertype;
186 };
187
188 #define Name "mdadm"
189
190 enum mode {
191 ASSEMBLE=1,
192 BUILD,
193 CREATE,
194 MANAGE,
195 MISC,
196 MONITOR,
197 GROW,
198 INCREMENTAL,
199 AUTODETECT,
200 };
201
202 extern char short_options[];
203 extern char short_bitmap_options[];
204 extern char short_bitmap_auto_options[];
205 extern struct option long_options[];
206 extern char Version[], Usage[], Help[], OptionHelp[],
207 Help_create[], Help_build[], Help_assemble[], Help_grow[],
208 Help_incr[],
209 Help_manage[], Help_misc[], Help_monitor[], Help_config[];
210
211 /* for option that don't have short equivilents, we assign arbitrary
212 * small numbers. '1' means an undecorated option, so we start at '2'.
213 */
214 enum special_options {
215 AssumeClean = 2,
216 BitmapChunk,
217 WriteBehind,
218 ReAdd,
219 NoDegraded,
220 Sparc22,
221 BackupFile,
222 HomeHost,
223 AutoHomeHost,
224 Symlinks,
225 AutoDetect,
226 };
227
228 /* structures read from config file */
229 /* List of mddevice names and identifiers
230 * Identifiers can be:
231 * uuid=128-hex-uuid
232 * super-minor=decimal-minor-number-from-superblock
233 * devices=comma,separated,list,of,device,names,with,wildcards
234 *
235 * If multiple fields are present, the intersection of all matching
236 * devices is considered
237 */
238 #define UnSet (0xfffe)
239 typedef struct mddev_ident_s {
240 char *devname;
241
242 int uuid_set;
243 int uuid[4];
244 char name[33];
245
246 unsigned int super_minor;
247
248 char *devices; /* comma separated list of device
249 * names with wild cards
250 */
251 int level;
252 unsigned int raid_disks;
253 unsigned int spare_disks;
254 struct supertype *st;
255 int autof; /* 1 for normal, 2 for partitioned */
256 char *spare_group;
257 char *bitmap_file;
258 int bitmap_fd;
259
260 struct mddev_ident_s *next;
261 } *mddev_ident_t;
262
263 /* List of device names - wildcards expanded */
264 typedef struct mddev_dev_s {
265 char *devname;
266 char disposition; /* 'a' for add, 'r' for remove, 'f' for fail.
267 * Not set for names read from .config
268 */
269 char writemostly;
270 char re_add;
271 char used; /* set when used */
272 struct mddev_dev_s *next;
273 } *mddev_dev_t;
274
275 typedef struct mapping {
276 char *name;
277 int num;
278 } mapping_t;
279
280
281 struct mdstat_ent {
282 char *dev;
283 int devnum;
284 int active;
285 char *level;
286 char *pattern; /* U or up, _ for down */
287 int percent; /* -1 if no resync */
288 int resync; /* 1 if resync, 0 if recovery */
289 int devcnt;
290 int raid_disks;
291 int chunk_size;
292 char * metadata_version;
293 struct mdstat_ent *next;
294 };
295
296 extern struct mdstat_ent *mdstat_read(int hold, int start);
297 extern void free_mdstat(struct mdstat_ent *ms);
298 extern void mdstat_wait(int seconds);
299 extern void mdstat_wait_fd(int fd, const sigset_t *sigmask);
300 extern int mddev_busy(int devnum);
301
302 struct map_ent {
303 struct map_ent *next;
304 int devnum;
305 char metadata[20];
306 int uuid[4];
307 char *path;
308 };
309 extern int map_update(struct map_ent **mpp, int devnum, char *metadata,
310 int uuid[4], char *path);
311 extern struct map_ent *map_by_uuid(struct map_ent **map, int uuid[4]);
312 extern void map_read(struct map_ent **melp);
313 extern int map_write(struct map_ent *mel);
314 extern void map_delete(struct map_ent **mapp, int devnum);
315 extern void map_free(struct map_ent *map);
316 extern void map_add(struct map_ent **melp,
317 int devnum, char *metadata, int uuid[4], char *path);
318
319 /* various details can be requested */
320 #define GET_LEVEL 1
321 #define GET_LAYOUT 2
322 #define GET_COMPONENT 4
323 #define GET_CHUNK 8
324 #define GET_CACHE 16
325 #define GET_MISMATCH 32
326 #define GET_VERSION 64
327 #define GET_DISKS 128
328 #define GET_DEGRADED 256
329
330 #define GET_DEVS 1024 /* gets role, major, minor */
331 #define GET_OFFSET 2048
332 #define GET_SIZE 4096
333 #define GET_STATE 8192
334 #define GET_ERROR 16384
335
336 /* If fd >= 0, get the array it is open on,
337 * else use devnum. >=0 -> major9. <0.....
338 */
339 extern int sysfs_open(int devnum, char *devname, char *attr);
340 extern void sysfs_free(struct mdinfo *sra);
341 extern struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options);
342 extern int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev,
343 char *name, char *val);
344 extern int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev,
345 char *name, unsigned long long val);
346 extern int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev,
347 char *name, unsigned long long *val);
348 extern int sysfs_set_array(struct mdinfo *sra,
349 struct mdinfo *info);
350 extern int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd);
351 extern int sysfs_disk_to_scsi_id(int fd, __u32 *id);
352 extern int sysfs_unique_holder(int devnum, long rdev);
353
354
355 extern int save_stripes(int *source, unsigned long long *offsets,
356 int raid_disks, int chunk_size, int level, int layout,
357 int nwrites, int *dest,
358 unsigned long long start, unsigned long long length);
359 extern int restore_stripes(int *dest, unsigned long long *offsets,
360 int raid_disks, int chunk_size, int level, int layout,
361 int source, unsigned long long read_offset,
362 unsigned long long start, unsigned long long length);
363
364 #ifndef Sendmail
365 #define Sendmail "/usr/lib/sendmail -t"
366 #endif
367
368 #define SYSLOG_FACILITY LOG_DAEMON
369
370 extern char *map_num(mapping_t *map, int num);
371 extern int map_name(mapping_t *map, char *name);
372 extern mapping_t r5layout[], pers[], modes[], faultylayout[];
373
374 extern char *map_dev(int major, int minor, int create);
375
376 struct active_array;
377 struct metadata_update;
378
379 /* A superswitch provides entry point the a metadata handler.
380 *
381 * The super_switch primarily operates on some "metadata" that
382 * is accessed via the 'supertype'.
383 * This metadata has one of three possible sources.
384 * 1/ It is read from a single device. In this case it may not completely
385 * describe the array or arrays as some information might be on other
386 * devices.
387 * 2/ It is read from all devices in a container. In this case all
388 * information is present.
389 * 3/ It is created by ->init_super / ->add_to_super. In this case it will
390 * be complete once enough ->add_to_super calls have completed.
391 *
392 * When creating an array inside a container, the metadata will be
393 * formed by a combination of 2 and 3. The metadata or the array is read,
394 * then new information is added.
395 *
396 * The metadata must sometimes have a concept of a 'current' array
397 * and a 'current' device.
398 * The 'current' array is set by init_super to be the newly created array,
399 * or is set by super_by_fd when it finds it is looking at an array inside
400 * a container.
401 *
402 * The 'current' device is either the device that the metadata was read from
403 * in case 1, or the last device added by add_to_super in case 3.
404 * Case 2 does not identify a 'current' device.
405 */
406 extern struct superswitch {
407
408 /* Used to report details of metadata read from a component
409 * device. ->load_super has been called.
410 */
411 void (*examine_super)(struct supertype *st, char *homehost);
412 void (*brief_examine_super)(struct supertype *st);
413 void (*export_examine_super)(struct supertype *st);
414
415 /* Used to report details of an active array.
416 * ->load_super was possibly given a 'component' string.
417 */
418 void (*detail_super)(struct supertype *st, char *homehost);
419 void (*brief_detail_super)(struct supertype *st);
420 void (*export_detail_super)(struct supertype *st);
421
422 /* Used:
423 * to get uuid to storing in bitmap metadata
424 * and 'reshape' backup-data metadata
425 * To see if a device is being re-added to an array it was part of.
426 */
427 void (*uuid_from_super)(struct supertype *st, int uuid[4]);
428
429 /* Extra generic details from metadata. This could be details about
430 * the container, or about an individual array within the container.
431 * The determination is made either by:
432 * load_super being given a 'component' string.
433 * validate_geometry determining what to create.
434 * The info includes both array information and device information.
435 * The particular device should be:
436 * The last device added by add_to_super
437 * The device the metadata was loaded from by load_super
438 */
439 void (*getinfo_super)(struct supertype *st, struct mdinfo *info);
440
441 /* Check if the given metadata is flagged as belonging to "this"
442 * host. For arrays that don't determine a minor-number, this
443 * can always be true (??)
444 */
445 int (*match_home)(struct supertype *st, char *homehost);
446
447 /* Make one of several generic modifications to metadata
448 * prior to assembly (or other times).
449 * sparc2.2 - first bug in early 0.90 metadata
450 * super-minor - change name of 0.90 metadata
451 * summaries - 'correct' any redundant data
452 * resync - mark array as dirty to trigger a resync.
453 * uuid - set new uuid - only 0.90 or 1.x
454 * name - change the name of the array (where supported)
455 * homehost - change which host this array is tied to.
456 * devicesize - If metadata is at start of device, change recorded
457 * device size to match actual device size
458 * byteorder - swap bytes for 0.90 metadata
459 *
460 * force-one - mark that device as uptodate, not old or failed.
461 * force-array - mark array as clean if it would not otherwise
462 * assemble
463 * assemble - not sure how this is different from force-one...
464 * linear-grow-new - add a new device to a linear array, but don't
465 * change the size: so superblock still matches
466 * linear-grow-update - now change the size of the array.
467 */
468 int (*update_super)(struct supertype *st, struct mdinfo *info,
469 char *update,
470 char *devname, int verbose,
471 int uuid_set, char *homehost);
472
473 /* Create new metadata for new array as described. This could
474 * be a new container, or an array in a pre-existing container.
475 * Also used to zero metadata prior to writing it to invalidate old
476 * metadata.
477 */
478 int (*init_super)(struct supertype *st, mdu_array_info_t *info,
479 unsigned long long size, char *name,
480 char *homehost, int *uuid);
481
482 /* update the metadata to include new device, either at create or
483 * when hot-adding a spare.
484 */
485 void (*add_to_super)(struct supertype *st, mdu_disk_info_t *dinfo,
486 int fd, char *devname);
487
488 /* Write metadata to one device when fixing problems or adding
489 * a new device.
490 */
491 int (*store_super)(struct supertype *st, int fd);
492
493 /* Write all metadata for this array.
494 */
495 int (*write_init_super)(struct supertype *st);
496 int (*compare_super)(struct supertype *st, struct supertype *tst);
497 int (*load_super)(struct supertype *st, int fd, char *devname);
498 struct supertype * (*match_metadata_desc)(char *arg);
499 __u64 (*avail_size)(struct supertype *st, __u64 size);
500 int (*add_internal_bitmap)(struct supertype *st, int *chunkp,
501 int delay, int write_behind,
502 unsigned long long size, int may_change, int major);
503 void (*locate_bitmap)(struct supertype *st, int fd);
504 int (*write_bitmap)(struct supertype *st, int fd);
505 void (*free_super)(struct supertype *st);
506
507 /* validate_geometry is called with an st returned by
508 * match_metadata_desc.
509 * It should check that the geometry described in compatible with
510 * the metadata type. It will be called repeatedly as devices
511 * added to validate changing size and new devices. If there are
512 * inter-device dependencies, it should record sufficient details
513 * so these can be validated.
514 */
515 int (*validate_geometry)(struct supertype *st, int level, int layout,
516 int raiddisks,
517 int chunk, unsigned long long size,
518 char *subdev, unsigned long long *freesize,
519 int verbose);
520
521 struct mdinfo *(*container_content)(struct supertype *st);
522
523 /* for mdmon */
524 int (*open_new)(struct supertype *c, struct active_array *a,
525 char *inst);
526
527 /* Tell the metadata handler the current state of the array.
528 * This covers whether it is known to be consistent (no pending writes)
529 * and how far along a resync is known to have progressed
530 * (in a->resync_start).
531 * resync status is really irrelevant if the array is not consistent,
532 * but some metadata (DDF!) have a place to record the distinction.
533 * If 'consistent' is '2', then the array can mark it dirty if a
534 * resync/recovery/whatever is required, or leave it clean if not.
535 * Return value is 0 dirty (not consistent) and 1 if clean.
536 * it is only really important if consistent is passed in as '2'.
537 */
538 int (*set_array_state)(struct active_array *a, int consistent);
539
540 /* When the state of a device might have changed, we call set_disk to
541 * tell the metadata what the current state is.
542 * Typically this happens on spare->in_sync and (spare|in_sync)->faulty
543 * transitions.
544 * set_disk might be called when the state of the particular disk has
545 * not in fact changed.
546 */
547 void (*set_disk)(struct active_array *a, int n, int state);
548 void (*sync_metadata)(struct supertype *st);
549 void (*process_update)(struct supertype *st,
550 struct metadata_update *update);
551 void (*prepare_update)(struct supertype *st,
552 struct metadata_update *update);
553
554 /* activate_spare will check if the array is degraded and, if it
555 * is, try to find some spare space in the container.
556 * On success, it add appropriate updates (For process_update) to
557 * to the 'updates' list and returns a list of 'mdinfo' identifying
558 * the device, or devices as there might be multiple missing
559 * devices and multiple spares available.
560 */
561 struct mdinfo *(*activate_spare)(struct active_array *a,
562 struct metadata_update **updates);
563
564 int swapuuid; /* true if uuid is bigending rather than hostendian */
565 int external;
566 } super0, super1, super_ddf, *superlist[];
567
568 extern struct superswitch super_imsm;
569
570 struct metadata_update {
571 int len;
572 char *buf;
573 void *space; /* allocated space that monitor will use */
574 struct metadata_update *next;
575 };
576
577 /* A supertype holds a particular collection of metadata.
578 * It identifies the metadata type by the superswitch, and the particular
579 * sub-version of that metadata type.
580 * metadata read in or created is stored in 'sb' and 'info'.
581 * There are also fields used by mdmon to track containers.
582 *
583 * A supertype is created by:
584 * super_by_fd
585 * guess_super
586 * dup_super
587 */
588 struct supertype {
589 struct superswitch *ss;
590 int minor_version;
591 int max_devs;
592 int container_dev; /* devnum of container */
593 char subarray[32]; /* name of array inside container */
594 void *sb;
595 void *info;
596
597 struct metadata_update *updates;
598 struct metadata_update **update_tail;
599
600 /* extra stuff used by mdmon */
601 struct active_array *arrays;
602 int sock; /* listen to external programs */
603 int devnum;
604 char *devname; /* e.g. md0. This appears in metadata_verison:
605 * external:/md0/12
606 */
607 int devcnt;
608 char *device_name; /* e.g. /dev/md/whatever */
609
610 struct mdinfo *devs;
611
612 };
613
614 extern struct supertype *super_by_fd(int fd);
615 extern struct supertype *guess_super(int fd);
616 extern struct supertype *dup_super(struct supertype *st);
617 extern int get_dev_size(int fd, char *dname, unsigned long long *sizep);
618 extern void get_one_disk(int mdfd, mdu_array_info_t *ainf,
619 mdu_disk_info_t *disk);
620
621 #if __GNUC__ < 3
622 struct stat64;
623 #endif
624
625 #define HAVE_NFTW we assume
626 #define HAVE_FTW
627
628 #ifdef UCLIBC
629 # include <features.h>
630 # ifndef __UCLIBC_HAS_FTW__
631 # undef HAVE_FTW
632 # undef HAVE_NFTW
633 # endif
634 #endif
635
636 #ifdef __dietlibc__
637 # undef HAVE_NFTW
638 #endif
639
640 #if defined(__KLIBC__)
641 # undef HAVE_NFTW
642 # undef HAVE_FTW
643 #endif
644
645 #ifndef HAVE_NFTW
646 # define FTW_PHYS 1
647 # ifndef HAVE_FTW
648 struct FTW {};
649 # endif
650 #endif
651
652 #ifdef HAVE_FTW
653 # include <ftw.h>
654 #endif
655
656 extern int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s);
657
658
659 extern int Manage_ro(char *devname, int fd, int readonly);
660 extern int Manage_runstop(char *devname, int fd, int runstop, int quiet);
661 extern int Manage_resize(char *devname, int fd, long long size, int raid_disks);
662 extern int Manage_reconfig(char *devname, int fd, int layout);
663 extern int Manage_subdevs(char *devname, int fd,
664 mddev_dev_t devlist, int verbose);
665 extern int autodetect(void);
666 extern int Grow_Add_device(char *devname, int fd, char *newdev);
667 extern int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int write_behind, int force);
668 extern int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
669 long long size,
670 int level, int layout, int chunksize, int raid_disks);
671 extern int Grow_restart(struct supertype *st, struct mdinfo *info,
672 int *fdlist, int cnt, char *backup_file);
673
674
675 extern int Assemble(struct supertype *st, char *mddev, int mdfd,
676 mddev_ident_t ident,
677 mddev_dev_t devlist, char *backup_file,
678 int readonly, int runstop,
679 char *update, char *homehost,
680 int verbose, int force);
681
682 extern int Build(char *mddev, int mdfd, int chunk, int level, int layout,
683 int raiddisks,
684 mddev_dev_t devlist, int assume_clean,
685 char *bitmap_file, int bitmap_chunk, int write_behind, int delay, int verbose);
686
687
688 extern int Create(struct supertype *st, char *mddev, int mdfd,
689 int chunk, int level, int layout, unsigned long long size, int raiddisks, int sparedisks,
690 char *name, char *homehost, int *uuid,
691 int subdevs, mddev_dev_t devlist,
692 int runstop, int verbose, int force, int assume_clean,
693 char *bitmap_file, int bitmap_chunk, int write_behind, int delay);
694
695 extern int Detail(char *dev, int brief, int export, int test, char *homehost);
696 extern int Query(char *dev);
697 extern int Examine(mddev_dev_t devlist, int brief, int export, int scan,
698 int SparcAdjust, struct supertype *forcest, char *homehost);
699 extern int Monitor(mddev_dev_t devlist,
700 char *mailaddr, char *alert_cmd,
701 int period, int daemonise, int scan, int oneshot,
702 int dosyslog, int test, char *pidfile);
703
704 extern int Kill(char *dev, int force, int quiet, int noexcl);
705 extern int Wait(char *dev);
706
707 extern int Incremental(char *devname, int verbose, int runstop,
708 struct supertype *st, char *homehost, int autof);
709 extern int Incremental_container(struct supertype *st, char *devname,
710 int verbose, int runstop, int autof);
711 extern void RebuildMap(void);
712 extern int IncrementalScan(int verbose);
713
714 extern int CreateBitmap(char *filename, int force, char uuid[16],
715 unsigned long chunksize, unsigned long daemon_sleep,
716 unsigned long write_behind,
717 unsigned long long array_size,
718 int major);
719 extern int ExamineBitmap(char *filename, int brief, struct supertype *st);
720 extern int bitmap_update_uuid(int fd, int *uuid, int swap);
721
722 extern int md_get_version(int fd);
723 extern int get_linux_version(void);
724 extern int parse_uuid(char *str, int uuid[4]);
725 extern int check_ext2(int fd, char *name);
726 extern int check_reiser(int fd, char *name);
727 extern int check_raid(int fd, char *name);
728
729 extern int get_mdp_major(void);
730 extern int dev_open(char *dev, int flags);
731 extern int open_dev_excl(int devnum);
732 extern int is_standard(char *dev, int *nump);
733
734 extern int parse_auto(char *str, char *msg, int config);
735 extern mddev_ident_t conf_get_ident(char *dev);
736 extern mddev_dev_t conf_get_devs(void);
737 extern int conf_test_dev(char *devname);
738 extern struct createinfo *conf_get_create_info(void);
739 extern void set_conffile(char *file);
740 extern char *conf_get_mailaddr(void);
741 extern char *conf_get_mailfrom(void);
742 extern char *conf_get_program(void);
743 extern char *conf_get_homehost(void);
744 extern char *conf_line(FILE *file);
745 extern char *conf_word(FILE *file, int allow_key);
746 extern void free_line(char *line);
747 extern int match_oneof(char *devices, char *devname);
748 extern void uuid_from_super(int uuid[4], mdp_super_t *super);
749 extern int same_uuid(int a[4], int b[4], int swapuuid);
750 extern void copy_uuid(void *a, int b[4], int swapuuid);
751 extern unsigned long calc_csum(void *super, int bytes);
752 extern int enough(int level, int raid_disks, int layout, int clean,
753 char *avail, int avail_disks);
754 extern int ask(char *mesg);
755 extern unsigned long long get_component_size(int fd);
756 extern void remove_partitions(int fd);
757 extern unsigned long long calc_array_size(int level, int raid_disks, int layout,
758 int chunksize, unsigned long long devsize);
759 extern int flush_metadata_updates(struct supertype *st);
760 extern void append_metadata_update(struct supertype *st, void *buf, int len);
761
762
763 extern char *human_size(long long bytes);
764 char *human_size_brief(long long bytes);
765
766 #define NoMdDev (1<<23)
767 extern int find_free_devnum(int use_partitions);
768
769 extern void put_md_name(char *name);
770 extern char *get_md_name(int dev);
771
772 extern char DefaultConfFile[];
773
774 extern int open_mddev(char *dev, int autof);
775 extern int open_mddev_devnum(char *devname, int devnum, char *name,
776 char *chosen_name, int parts);
777 extern int open_container(int fd);
778
779 extern int mdmon_running(int devnum);
780 extern int signal_mdmon(int devnum);
781 extern int env_no_mdmon(void);
782 extern int start_mdmon(int devnum);
783
784 extern char *devnum2devname(int num);
785 extern int devname2devnum(char *name);
786 extern int fd2devnum(int fd);
787
788 static inline int dev2major(int d)
789 {
790 if (d >= 0)
791 return MD_MAJOR;
792 else
793 return get_mdp_major();
794 }
795
796 static inline int dev2minor(int d)
797 {
798 if (d >= 0)
799 return d;
800 return (-1-d) << MdpMinorShift;
801 }
802
803 static inline int ROUND_UP(int a, int base)
804 {
805 return ((a+base-1)/base)*base;
806 }
807
808 static inline int is_subarray(char *vers)
809 {
810 /* The version string for a 'subarray' (an array in a container)
811 * is
812 * /containername/componentname for normal read-write arrays
813 * -containername/componentname for read-only arrays.
814 * containername is e.g. md0, md_d1
815 * componentname is dependant on the metadata. e.g. '1' 'S1' ...
816 */
817 return (*vers == '/' || *vers == '-');
818 }
819
820 #define LEVEL_MULTIPATH (-4)
821 #define LEVEL_LINEAR (-1)
822 #define LEVEL_FAULTY (-5)
823
824 /* kernel module doesn't know about these */
825 #define LEVEL_CONTAINER (-100)
826 #define LEVEL_UNSUPPORTED (-200)
827
828
829 /* faulty stuff */
830
831 #define WriteTransient 0
832 #define ReadTransient 1
833 #define WritePersistent 2
834 #define ReadPersistent 3
835 #define WriteAll 4 /* doesn't go to device */
836 #define ReadFixable 5
837 #define Modes 6
838
839 #define ClearErrors 31
840 #define ClearFaults 30
841
842 #define AllPersist 100 /* internal use only */
843 #define NoPersist 101
844
845 #define ModeMask 0x1f
846 #define ModeShift 5
847
848
849 #ifdef __TINYC__
850 #undef minor
851 #undef major
852 #undef makedev
853 #define minor(x) ((x)&0xff)
854 #define major(x) (((x)>>8)&0xff)
855 #define makedev(M,m) (((M)<<8) | (m))
856 #endif
857
858 /* for raid5 */
859 #define ALGORITHM_LEFT_ASYMMETRIC 0
860 #define ALGORITHM_RIGHT_ASYMMETRIC 1
861 #define ALGORITHM_LEFT_SYMMETRIC 2
862 #define ALGORITHM_RIGHT_SYMMETRIC 3