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Exmaine/brief: put member arrays after container arrays.
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1 /*
2 * mdadm - manage Linux "md" devices aka RAID arrays.
3 *
4 * Copyright (C) 2001-2009 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@suse.de>
23 */
24
25 #define _GNU_SOURCE
26 #define _FILE_OFFSET_BITS 64
27 #include <unistd.h>
28 #if !defined(__dietlibc__) && !defined(__KLIBC__)
29 extern __off64_t lseek64 __P ((int __fd, __off64_t __offset, int __whence));
30 #else
31 # if defined(__NO_STAT64) || __WORDSIZE != 32
32 # define lseek64 lseek
33 # endif
34 #endif
35
36 #include <sys/types.h>
37 #include <sys/stat.h>
38 #include <stdlib.h>
39 #include <time.h>
40 #include <sys/time.h>
41 #include <getopt.h>
42 #include <fcntl.h>
43 #include <stdio.h>
44 #include <errno.h>
45 #include <string.h>
46 #include <syslog.h>
47 #ifdef __dietlibc__
48 #include <strings.h>
49 /* dietlibc has deprecated random and srandom!! */
50 #define random rand
51 #define srandom srand
52 #endif
53
54
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>
60 #define MD_MAJOR 9
61 #define MdpMinorShift 6
62
63 #ifndef BLKGETSIZE64
64 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
65 #endif
66
67 #define DEFAULT_BITMAP_CHUNK 4096
68 #define DEFAULT_BITMAP_DELAY 5
69 #define DEFAULT_MAX_WRITE_BEHIND 256
70
71 #include "md_u.h"
72 #include "md_p.h"
73 #include "bitmap.h"
74 #include "msg.h"
75
76 #include <endian.h>
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 /* And dietlibc doesn't think byteswap is ok, so.. */
81 /* #include <byteswap.h> */
82 #define bswap_16(x) (((x) & 0x00ffU) << 8 | \
83 ((x) & 0xff00U) >> 8)
84 #define bswap_32(x) (((x) & 0x000000ffU) << 24 | \
85 ((x) & 0xff000000U) >> 24 | \
86 ((x) & 0x0000ff00U) << 8 | \
87 ((x) & 0x00ff0000U) >> 8)
88 #define bswap_64(x) (((x) & 0x00000000000000ffULL) << 56 | \
89 ((x) & 0xff00000000000000ULL) >> 56 | \
90 ((x) & 0x000000000000ff00ULL) << 40 | \
91 ((x) & 0x00ff000000000000ULL) >> 40 | \
92 ((x) & 0x0000000000ff0000ULL) << 24 | \
93 ((x) & 0x0000ff0000000000ULL) >> 24 | \
94 ((x) & 0x00000000ff000000ULL) << 8 | \
95 ((x) & 0x000000ff00000000ULL) >> 8)
96
97 #if !defined(__KLIBC__)
98 #if BYTE_ORDER == LITTLE_ENDIAN
99 #define __cpu_to_le16(_x) (_x)
100 #define __cpu_to_le32(_x) (_x)
101 #define __cpu_to_le64(_x) (_x)
102 #define __le16_to_cpu(_x) (_x)
103 #define __le32_to_cpu(_x) (_x)
104 #define __le64_to_cpu(_x) (_x)
105
106 #define __cpu_to_be16(_x) bswap_16(_x)
107 #define __cpu_to_be32(_x) bswap_32(_x)
108 #define __cpu_to_be64(_x) bswap_64(_x)
109 #define __be16_to_cpu(_x) bswap_16(_x)
110 #define __be32_to_cpu(_x) bswap_32(_x)
111 #define __be64_to_cpu(_x) bswap_64(_x)
112 #elif BYTE_ORDER == BIG_ENDIAN
113 #define __cpu_to_le16(_x) bswap_16(_x)
114 #define __cpu_to_le32(_x) bswap_32(_x)
115 #define __cpu_to_le64(_x) bswap_64(_x)
116 #define __le16_to_cpu(_x) bswap_16(_x)
117 #define __le32_to_cpu(_x) bswap_32(_x)
118 #define __le64_to_cpu(_x) bswap_64(_x)
119
120 #define __cpu_to_be16(_x) (_x)
121 #define __cpu_to_be32(_x) (_x)
122 #define __cpu_to_be64(_x) (_x)
123 #define __be16_to_cpu(_x) (_x)
124 #define __be32_to_cpu(_x) (_x)
125 #define __be64_to_cpu(_x) (_x)
126 #else
127 # error "unknown endianness."
128 #endif
129 #endif /* __KLIBC__ */
130
131
132
133 /* general information that might be extracted from a superblock */
134 struct mdinfo {
135 mdu_array_info_t array;
136 mdu_disk_info_t disk;
137 __u64 events;
138 int uuid[4];
139 char name[33];
140 unsigned long long data_offset;
141 unsigned long long component_size; /* same as array.size, except in
142 * sectors and up to 64bits.
143 */
144 unsigned long long custom_array_size; /* size for non-default sized
145 * arrays (in sectors)
146 */
147 int reshape_active;
148 unsigned long long reshape_progress;
149 unsigned long long resync_start;
150 unsigned long safe_mode_delay; /* ms delay to mark clean */
151 int new_level, delta_disks, new_layout, new_chunk;
152 int errors;
153 int cache_size; /* size of raid456 stripe cache*/
154 int mismatch_cnt;
155 char text_version[50];
156
157 int container_member; /* for assembling external-metatdata arrays
158 * This is to be used internally by metadata
159 * handler only */
160
161 char sys_name[20];
162 struct mdinfo *devs;
163 struct mdinfo *next;
164
165 /* Device info for mdmon: */
166 int state_fd;
167 #define DS_FAULTY 1
168 #define DS_INSYNC 2
169 #define DS_WRITE_MOSTLY 4
170 #define DS_SPARE 8
171 #define DS_BLOCKED 16
172 #define DS_REMOVE 1024
173 #define DS_UNBLOCK 2048
174 int prev_state, curr_state, next_state;
175
176 };
177
178 struct createinfo {
179 int uid;
180 int gid;
181 int autof;
182 int mode;
183 int symlinks;
184 struct supertype *supertype;
185 };
186
187 #define Name "mdadm"
188
189 enum mode {
190 ASSEMBLE=1,
191 BUILD,
192 CREATE,
193 MANAGE,
194 MISC,
195 MONITOR,
196 GROW,
197 INCREMENTAL,
198 AUTODETECT,
199 };
200
201 extern char short_options[];
202 extern char short_bitmap_options[];
203 extern char short_bitmap_auto_options[];
204 extern struct option long_options[];
205 extern char Version[], Usage[], Help[], OptionHelp[],
206 Help_create[], Help_build[], Help_assemble[], Help_grow[],
207 Help_incr[],
208 Help_manage[], Help_misc[], Help_monitor[], Help_config[];
209
210 /* for option that don't have short equivilents, we assign arbitrary
211 * small numbers. '1' means an undecorated option, so we start at '2'.
212 */
213 enum special_options {
214 AssumeClean = 2,
215 BitmapChunk,
216 WriteBehind,
217 ReAdd,
218 NoDegraded,
219 Sparc22,
220 BackupFile,
221 HomeHost,
222 AutoHomeHost,
223 Symlinks,
224 AutoDetect,
225 Waitclean,
226 DetailPlatform,
227 };
228
229 /* structures read from config file */
230 /* List of mddevice names and identifiers
231 * Identifiers can be:
232 * uuid=128-hex-uuid
233 * super-minor=decimal-minor-number-from-superblock
234 * devices=comma,separated,list,of,device,names,with,wildcards
235 *
236 * If multiple fields are present, the intersection of all matching
237 * devices is considered
238 */
239 #define UnSet (0xfffe)
240 typedef struct mddev_ident_s {
241 char *devname;
242
243 int uuid_set;
244 int uuid[4];
245 char name[33];
246
247 unsigned int super_minor;
248
249 char *devices; /* comma separated list of device
250 * names with wild cards
251 */
252 int level;
253 unsigned int raid_disks;
254 unsigned int spare_disks;
255 struct supertype *st;
256 int autof; /* 1 for normal, 2 for partitioned */
257 char *spare_group;
258 char *bitmap_file;
259 int bitmap_fd;
260
261 char *container; /* /dev/whatever name of container, or
262 * uuid of container. You would expect
263 * this to be the 'devname' or UUID
264 * of some other entry.
265 */
266 char *member; /* subarray within a container */
267
268 struct mddev_ident_s *next;
269 } *mddev_ident_t;
270
271 /* List of device names - wildcards expanded */
272 typedef struct mddev_dev_s {
273 char *devname;
274 char disposition; /* 'a' for add, 'r' for remove, 'f' for fail.
275 * Not set for names read from .config
276 */
277 char writemostly; /* 1 for 'set writemostly', 2 for 'clear writemostly' */
278 char re_add;
279 char used; /* set when used */
280 struct mdinfo *content; /* If devname is a container, this might list
281 * the remaining member arrays. */
282 struct mddev_dev_s *next;
283 } *mddev_dev_t;
284
285 typedef struct mapping {
286 char *name;
287 int num;
288 } mapping_t;
289
290
291 struct mdstat_ent {
292 char *dev;
293 int devnum;
294 int active;
295 char *level;
296 char *pattern; /* U or up, _ for down */
297 int percent; /* -1 if no resync */
298 int resync; /* 1 if resync, 0 if recovery */
299 int devcnt;
300 int raid_disks;
301 int chunk_size;
302 char * metadata_version;
303 struct mdstat_ent *next;
304 };
305
306 extern struct mdstat_ent *mdstat_read(int hold, int start);
307 extern void free_mdstat(struct mdstat_ent *ms);
308 extern void mdstat_wait(int seconds);
309 extern void mdstat_wait_fd(int fd, const sigset_t *sigmask);
310 extern int mddev_busy(int devnum);
311
312 struct map_ent {
313 struct map_ent *next;
314 int devnum;
315 char metadata[20];
316 int uuid[4];
317 int bad;
318 char *path;
319 };
320 extern int map_update(struct map_ent **mpp, int devnum, char *metadata,
321 int uuid[4], char *path);
322 extern struct map_ent *map_by_uuid(struct map_ent **map, int uuid[4]);
323 extern struct map_ent *map_by_devnum(struct map_ent **map, int devnum);
324 extern struct map_ent *map_by_name(struct map_ent **map, char *name);
325 extern void map_read(struct map_ent **melp);
326 extern int map_write(struct map_ent *mel);
327 extern void map_delete(struct map_ent **mapp, int devnum);
328 extern void map_free(struct map_ent *map);
329 extern void map_add(struct map_ent **melp,
330 int devnum, char *metadata, int uuid[4], char *path);
331 extern int map_lock(struct map_ent **melp);
332 extern void map_unlock(struct map_ent **melp);
333
334 /* various details can be requested */
335 enum sysfs_read_flags {
336 GET_LEVEL = (1 << 0),
337 GET_LAYOUT = (1 << 1),
338 GET_COMPONENT = (1 << 2),
339 GET_CHUNK = (1 << 3),
340 GET_CACHE = (1 << 4),
341 GET_MISMATCH = (1 << 5),
342 GET_VERSION = (1 << 6),
343 GET_DISKS = (1 << 7),
344 GET_DEGRADED = (1 << 8),
345 GET_SAFEMODE = (1 << 9),
346 GET_DEVS = (1 << 10), /* gets role, major, minor */
347 GET_OFFSET = (1 << 11),
348 GET_SIZE = (1 << 12),
349 GET_STATE = (1 << 13),
350 GET_ERROR = (1 << 14),
351 SKIP_GONE_DEVS = (1 << 15),
352 };
353
354 /* If fd >= 0, get the array it is open on,
355 * else use devnum. >=0 -> major9. <0.....
356 */
357 extern int sysfs_open(int devnum, char *devname, char *attr);
358 extern void sysfs_init(struct mdinfo *mdi, int fd, int devnum);
359 extern void sysfs_free(struct mdinfo *sra);
360 extern struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options);
361 extern int sysfs_attr_match(const char *attr, const char *str);
362 extern int sysfs_match_word(const char *word, char **list);
363 extern int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev,
364 char *name, char *val);
365 extern int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev,
366 char *name, unsigned long long val);
367 extern int sysfs_uevent(struct mdinfo *sra, char *event);
368 extern int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev,
369 char *name, unsigned long long *val);
370 extern int sysfs_get_str(struct mdinfo *sra, struct mdinfo *dev,
371 char *name, char *val, int size);
372 extern int sysfs_set_safemode(struct mdinfo *sra, unsigned long ms);
373 extern int sysfs_set_array(struct mdinfo *info, int vers);
374 extern int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd,
375 int in_sync);
376 extern int sysfs_disk_to_scsi_id(int fd, __u32 *id);
377 extern int sysfs_unique_holder(int devnum, long rdev);
378 extern int load_sys(char *path, char *buf);
379
380
381 extern int save_stripes(int *source, unsigned long long *offsets,
382 int raid_disks, int chunk_size, int level, int layout,
383 int nwrites, int *dest,
384 unsigned long long start, unsigned long long length);
385 extern int restore_stripes(int *dest, unsigned long long *offsets,
386 int raid_disks, int chunk_size, int level, int layout,
387 int source, unsigned long long read_offset,
388 unsigned long long start, unsigned long long length);
389
390 #ifndef Sendmail
391 #define Sendmail "/usr/lib/sendmail -t"
392 #endif
393
394 #define SYSLOG_FACILITY LOG_DAEMON
395
396 extern char *map_num(mapping_t *map, int num);
397 extern int map_name(mapping_t *map, char *name);
398 extern mapping_t r5layout[], r6layout[], pers[], modes[], faultylayout[];
399
400 extern char *map_dev(int major, int minor, int create);
401
402 struct active_array;
403 struct metadata_update;
404
405 /* A superswitch provides entry point the a metadata handler.
406 *
407 * The super_switch primarily operates on some "metadata" that
408 * is accessed via the 'supertype'.
409 * This metadata has one of three possible sources.
410 * 1/ It is read from a single device. In this case it may not completely
411 * describe the array or arrays as some information might be on other
412 * devices.
413 * 2/ It is read from all devices in a container. In this case all
414 * information is present.
415 * 3/ It is created by ->init_super / ->add_to_super. In this case it will
416 * be complete once enough ->add_to_super calls have completed.
417 *
418 * When creating an array inside a container, the metadata will be
419 * formed by a combination of 2 and 3. The metadata or the array is read,
420 * then new information is added.
421 *
422 * The metadata must sometimes have a concept of a 'current' array
423 * and a 'current' device.
424 * The 'current' array is set by init_super to be the newly created array,
425 * or is set by super_by_fd when it finds it is looking at an array inside
426 * a container.
427 *
428 * The 'current' device is either the device that the metadata was read from
429 * in case 1, or the last device added by add_to_super in case 3.
430 * Case 2 does not identify a 'current' device.
431 */
432 extern struct superswitch {
433
434 /* Used to report details of metadata read from a component
435 * device. ->load_super has been called.
436 */
437 void (*examine_super)(struct supertype *st, char *homehost);
438 void (*brief_examine_super)(struct supertype *st, int verbose);
439 void (*brief_examine_subarrays)(struct supertype *st, int verbose);
440 void (*export_examine_super)(struct supertype *st);
441
442 /* Used to report details of an active array.
443 * ->load_super was possibly given a 'component' string.
444 */
445 void (*detail_super)(struct supertype *st, char *homehost);
446 void (*brief_detail_super)(struct supertype *st);
447 void (*export_detail_super)(struct supertype *st);
448
449 /* Optional: platform hardware / firmware details */
450 int (*detail_platform)(int verbose, int enumerate_only);
451
452 /* Used:
453 * to get uuid to storing in bitmap metadata
454 * and 'reshape' backup-data metadata
455 * To see if a device is being re-added to an array it was part of.
456 */
457 void (*uuid_from_super)(struct supertype *st, int uuid[4]);
458
459 /* Extract generic details from metadata. This could be details about
460 * the container, or about an individual array within the container.
461 * The determination is made either by:
462 * load_super being given a 'component' string.
463 * validate_geometry determining what to create.
464 * The info includes both array information and device information.
465 * The particular device should be:
466 * The last device added by add_to_super
467 * The device the metadata was loaded from by load_super
468 */
469 void (*getinfo_super)(struct supertype *st, struct mdinfo *info);
470
471 /* Check if the given metadata is flagged as belonging to "this"
472 * host. 0 for 'no', 1 for 'yes', -1 for "Don't record homehost"
473 */
474 int (*match_home)(struct supertype *st, char *homehost);
475
476 /* Make one of several generic modifications to metadata
477 * prior to assembly (or other times).
478 * sparc2.2 - first bug in early 0.90 metadata
479 * super-minor - change name of 0.90 metadata
480 * summaries - 'correct' any redundant data
481 * resync - mark array as dirty to trigger a resync.
482 * uuid - set new uuid - only 0.90 or 1.x
483 * name - change the name of the array (where supported)
484 * homehost - change which host this array is tied to.
485 * devicesize - If metadata is at start of device, change recorded
486 * device size to match actual device size
487 * byteorder - swap bytes for 0.90 metadata
488 *
489 * force-one - mark that device as uptodate, not old or failed.
490 * force-array - mark array as clean if it would not otherwise
491 * assemble
492 * assemble - not sure how this is different from force-one...
493 * linear-grow-new - add a new device to a linear array, but don't
494 * change the size: so superblock still matches
495 * linear-grow-update - now change the size of the array.
496 */
497 int (*update_super)(struct supertype *st, struct mdinfo *info,
498 char *update,
499 char *devname, int verbose,
500 int uuid_set, char *homehost);
501
502 /* Create new metadata for new array as described. This could
503 * be a new container, or an array in a pre-existing container.
504 * Also used to zero metadata prior to writing it to invalidate old
505 * metadata.
506 */
507 int (*init_super)(struct supertype *st, mdu_array_info_t *info,
508 unsigned long long size, char *name,
509 char *homehost, int *uuid);
510
511 /* update the metadata to include new device, either at create or
512 * when hot-adding a spare.
513 */
514 int (*add_to_super)(struct supertype *st, mdu_disk_info_t *dinfo,
515 int fd, char *devname);
516
517 /* Write metadata to one device when fixing problems or adding
518 * a new device.
519 */
520 int (*store_super)(struct supertype *st, int fd);
521
522 /* Write all metadata for this array.
523 */
524 int (*write_init_super)(struct supertype *st);
525 int (*compare_super)(struct supertype *st, struct supertype *tst);
526 int (*load_super)(struct supertype *st, int fd, char *devname);
527 struct supertype * (*match_metadata_desc)(char *arg);
528 __u64 (*avail_size)(struct supertype *st, __u64 size);
529 int (*add_internal_bitmap)(struct supertype *st, int *chunkp,
530 int delay, int write_behind,
531 unsigned long long size, int may_change, int major);
532 void (*locate_bitmap)(struct supertype *st, int fd);
533 int (*write_bitmap)(struct supertype *st, int fd);
534 void (*free_super)(struct supertype *st);
535
536 /* validate_geometry is called with an st returned by
537 * match_metadata_desc.
538 * It should check that the geometry described in compatible with
539 * the metadata type. It will be called repeatedly as devices
540 * added to validate changing size and new devices. If there are
541 * inter-device dependencies, it should record sufficient details
542 * so these can be validated.
543 * Both 'size' and '*freesize' are in sectors. chunk is bytes.
544 */
545 int (*validate_geometry)(struct supertype *st, int level, int layout,
546 int raiddisks,
547 int chunk, unsigned long long size,
548 char *subdev, unsigned long long *freesize,
549 int verbose);
550
551 struct mdinfo *(*container_content)(struct supertype *st);
552 /* Allow a metadata handler to override mdadm's default layouts */
553 int (*default_layout)(int level); /* optional */
554
555 /* for mdmon */
556 int (*open_new)(struct supertype *c, struct active_array *a,
557 char *inst);
558
559 /* Tell the metadata handler the current state of the array.
560 * This covers whether it is known to be consistent (no pending writes)
561 * and how far along a resync is known to have progressed
562 * (in a->resync_start).
563 * resync status is really irrelevant if the array is not consistent,
564 * but some metadata (DDF!) have a place to record the distinction.
565 * If 'consistent' is '2', then the array can mark it dirty if a
566 * resync/recovery/whatever is required, or leave it clean if not.
567 * Return value is 0 dirty (not consistent) and 1 if clean.
568 * it is only really important if consistent is passed in as '2'.
569 */
570 int (*set_array_state)(struct active_array *a, int consistent);
571
572 /* When the state of a device might have changed, we call set_disk to
573 * tell the metadata what the current state is.
574 * Typically this happens on spare->in_sync and (spare|in_sync)->faulty
575 * transitions.
576 * set_disk might be called when the state of the particular disk has
577 * not in fact changed.
578 */
579 void (*set_disk)(struct active_array *a, int n, int state);
580 void (*sync_metadata)(struct supertype *st);
581 void (*process_update)(struct supertype *st,
582 struct metadata_update *update);
583 void (*prepare_update)(struct supertype *st,
584 struct metadata_update *update);
585
586 /* activate_spare will check if the array is degraded and, if it
587 * is, try to find some spare space in the container.
588 * On success, it add appropriate updates (For process_update) to
589 * to the 'updates' list and returns a list of 'mdinfo' identifying
590 * the device, or devices as there might be multiple missing
591 * devices and multiple spares available.
592 */
593 struct mdinfo *(*activate_spare)(struct active_array *a,
594 struct metadata_update **updates);
595
596 int swapuuid; /* true if uuid is bigending rather than hostendian */
597 int external;
598 const char *name; /* canonical metadata name */
599 } super0, super1, super_ddf, *superlist[];
600
601 extern struct superswitch super_imsm;
602
603 struct metadata_update {
604 int len;
605 char *buf;
606 void *space; /* allocated space that monitor will use */
607 struct metadata_update *next;
608 };
609
610 /* A supertype holds a particular collection of metadata.
611 * It identifies the metadata type by the superswitch, and the particular
612 * sub-version of that metadata type.
613 * metadata read in or created is stored in 'sb' and 'info'.
614 * There are also fields used by mdmon to track containers.
615 *
616 * A supertype may refer to:
617 * Just an array, possibly in a container
618 * A container, not identifying any particular array
619 * Info read from just one device, not yet fully describing the array/container.
620 *
621 *
622 * A supertype is created by:
623 * super_by_fd
624 * guess_super
625 * dup_super
626 */
627 struct supertype {
628 struct superswitch *ss;
629 int minor_version;
630 int max_devs;
631 int container_dev; /* devnum of container */
632 char subarray[32]; /* name of array inside container */
633 void *sb;
634 void *info;
635 int loaded_container; /* Set if load_super found a container,
636 * not just one device */
637
638 struct metadata_update *updates;
639 struct metadata_update **update_tail;
640
641 /* extra stuff used by mdmon */
642 struct active_array *arrays;
643 int sock; /* listen to external programs */
644 int devnum;
645 char *devname; /* e.g. md0. This appears in metadata_verison:
646 * external:/md0/12
647 */
648 int devcnt;
649
650 struct mdinfo *devs;
651
652 };
653
654 extern struct supertype *super_by_fd(int fd);
655 extern struct supertype *guess_super(int fd);
656 extern struct supertype *dup_super(struct supertype *st);
657 extern int get_dev_size(int fd, char *dname, unsigned long long *sizep);
658 extern void get_one_disk(int mdfd, mdu_array_info_t *ainf,
659 mdu_disk_info_t *disk);
660 void wait_for(char *dev, int fd);
661
662 #if __GNUC__ < 3
663 struct stat64;
664 #endif
665
666 #define HAVE_NFTW we assume
667 #define HAVE_FTW
668
669 #ifdef __UCLIBC__
670 # include <features.h>
671 # ifndef __UCLIBC_HAS_LFS__
672 # define lseek64 lseek
673 # endif
674 # ifndef __UCLIBC_HAS_FTW__
675 # undef HAVE_FTW
676 # undef HAVE_NFTW
677 # endif
678 #endif
679
680 #ifdef __dietlibc__
681 # undef HAVE_NFTW
682 #endif
683
684 #if defined(__KLIBC__)
685 # undef HAVE_NFTW
686 # undef HAVE_FTW
687 #endif
688
689 #ifndef HAVE_NFTW
690 # define FTW_PHYS 1
691 # ifndef HAVE_FTW
692 struct FTW {};
693 # endif
694 #endif
695
696 #ifdef HAVE_FTW
697 # include <ftw.h>
698 #endif
699
700 extern int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s);
701
702
703 extern int Manage_ro(char *devname, int fd, int readonly);
704 extern int Manage_runstop(char *devname, int fd, int runstop, int quiet);
705 extern int Manage_resize(char *devname, int fd, long long size, int raid_disks);
706 extern int Manage_reconfig(char *devname, int fd, int layout);
707 extern int Manage_subdevs(char *devname, int fd,
708 mddev_dev_t devlist, int verbose);
709 extern int autodetect(void);
710 extern int Grow_Add_device(char *devname, int fd, char *newdev);
711 extern int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int write_behind, int force);
712 extern int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
713 long long size,
714 int level, int layout, int chunksize, int raid_disks);
715 extern int Grow_restart(struct supertype *st, struct mdinfo *info,
716 int *fdlist, int cnt, char *backup_file);
717
718
719 extern int Assemble(struct supertype *st, char *mddev,
720 mddev_ident_t ident,
721 mddev_dev_t devlist, char *backup_file,
722 int readonly, int runstop,
723 char *update, char *homehost, int require_homehost,
724 int verbose, int force);
725
726 extern int Build(char *mddev, int chunk, int level, int layout,
727 int raiddisks, mddev_dev_t devlist, int assume_clean,
728 char *bitmap_file, int bitmap_chunk, int write_behind,
729 int delay, int verbose, int autof, unsigned long long size);
730
731
732 extern int Create(struct supertype *st, char *mddev,
733 int chunk, int level, int layout, unsigned long long size, int raiddisks, int sparedisks,
734 char *name, char *homehost, int *uuid,
735 int subdevs, mddev_dev_t devlist,
736 int runstop, int verbose, int force, int assume_clean,
737 char *bitmap_file, int bitmap_chunk, int write_behind, int delay, int autof);
738
739 extern int Detail(char *dev, int brief, int export, int test, char *homehost);
740 extern int Detail_Platform(struct superswitch *ss, int scan, int verbose);
741 extern int Query(char *dev);
742 extern int Examine(mddev_dev_t devlist, int brief, int export, int scan,
743 int SparcAdjust, struct supertype *forcest, char *homehost);
744 extern int Monitor(mddev_dev_t devlist,
745 char *mailaddr, char *alert_cmd,
746 int period, int daemonise, int scan, int oneshot,
747 int dosyslog, int test, char *pidfile);
748
749 extern int Kill(char *dev, int force, int quiet, int noexcl);
750 extern int Wait(char *dev);
751 extern int WaitClean(char *dev, int verbose);
752
753 extern int Incremental(char *devname, int verbose, int runstop,
754 struct supertype *st, char *homehost, int require_homehost,
755 int autof);
756 extern int Incremental_container(struct supertype *st, char *devname,
757 int verbose, int runstop, int autof,
758 int trustworthy);
759 extern void RebuildMap(void);
760 extern int IncrementalScan(int verbose);
761
762 extern int CreateBitmap(char *filename, int force, char uuid[16],
763 unsigned long chunksize, unsigned long daemon_sleep,
764 unsigned long write_behind,
765 unsigned long long array_size,
766 int major);
767 extern int ExamineBitmap(char *filename, int brief, struct supertype *st);
768 extern int bitmap_update_uuid(int fd, int *uuid, int swap);
769 extern unsigned long bitmap_sectors(struct bitmap_super_s *bsb);
770
771 extern int md_get_version(int fd);
772 extern int get_linux_version(void);
773 extern int parse_uuid(char *str, int uuid[4]);
774 extern int check_ext2(int fd, char *name);
775 extern int check_reiser(int fd, char *name);
776 extern int check_raid(int fd, char *name);
777
778 extern int get_mdp_major(void);
779 extern int dev_open(char *dev, int flags);
780 extern int open_dev(int devnum);
781 extern int open_dev_excl(int devnum);
782 extern int is_standard(char *dev, int *nump);
783 extern int same_dev(char *one, char *two);
784
785 extern int parse_auto(char *str, char *msg, int config);
786 extern mddev_ident_t conf_get_ident(char *dev);
787 extern mddev_dev_t conf_get_devs(void);
788 extern int conf_test_dev(char *devname);
789 extern int conf_test_metadata(const char *version);
790 extern struct createinfo *conf_get_create_info(void);
791 extern void set_conffile(char *file);
792 extern char *conf_get_mailaddr(void);
793 extern char *conf_get_mailfrom(void);
794 extern char *conf_get_program(void);
795 extern char *conf_get_homehost(int *require_homehostp);
796 extern char *conf_line(FILE *file);
797 extern char *conf_word(FILE *file, int allow_key);
798 extern int conf_name_is_free(char *name);
799 extern int devname_matches(char *name, char *match);
800 extern struct mddev_ident_s *conf_match(struct mdinfo *info, struct supertype *st);
801
802 extern void free_line(char *line);
803 extern int match_oneof(char *devices, char *devname);
804 extern void uuid_from_super(int uuid[4], mdp_super_t *super);
805 extern const int uuid_match_any[4];
806 extern int same_uuid(int a[4], int b[4], int swapuuid);
807 extern void copy_uuid(void *a, int b[4], int swapuuid);
808 extern char *fname_from_uuid(struct supertype *st,
809 struct mdinfo *info, char *buf, char sep);
810 extern unsigned long calc_csum(void *super, int bytes);
811 extern int enough(int level, int raid_disks, int layout, int clean,
812 char *avail, int avail_disks);
813 extern int ask(char *mesg);
814 extern unsigned long long get_component_size(int fd);
815 extern void remove_partitions(int fd);
816 extern unsigned long long calc_array_size(int level, int raid_disks, int layout,
817 int chunksize, unsigned long long devsize);
818 extern int flush_metadata_updates(struct supertype *st);
819 extern void append_metadata_update(struct supertype *st, void *buf, int len);
820 extern int assemble_container_content(struct supertype *st, int mdfd,
821 struct mdinfo *content, int runstop,
822 char *chosen_name, int verbose);
823
824 extern int add_disk(int mdfd, struct supertype *st,
825 struct mdinfo *sra, struct mdinfo *info);
826 extern int set_array_info(int mdfd, struct supertype *st, struct mdinfo *info);
827
828 extern char *human_size(long long bytes);
829 extern char *human_size_brief(long long bytes);
830 extern void print_r10_layout(int layout);
831
832 #define NoMdDev (1<<23)
833 extern int find_free_devnum(int use_partitions);
834
835 extern void put_md_name(char *name);
836 extern char *get_md_name(int dev);
837
838 extern char DefaultConfFile[];
839
840 extern int create_mddev(char *dev, char *name, int autof, int trustworthy,
841 char *chosen);
842 /* values for 'trustworthy' */
843 #define LOCAL 1
844 #define FOREIGN 2
845 #define METADATA 3
846 extern int open_mddev(char *dev, int report_errors);
847 extern int open_container(int fd);
848
849 extern int mdmon_running(int devnum);
850 extern int signal_mdmon(int devnum);
851 extern int check_env(char *name);
852 extern __u32 random32(void);
853 extern int start_mdmon(int devnum);
854
855 extern char *devnum2devname(int num);
856 extern int devname2devnum(char *name);
857 extern int stat2devnum(struct stat *st);
858 extern int fd2devnum(int fd);
859
860 static inline int dev2major(int d)
861 {
862 if (d >= 0)
863 return MD_MAJOR;
864 else
865 return get_mdp_major();
866 }
867
868 static inline int dev2minor(int d)
869 {
870 if (d >= 0)
871 return d;
872 return (-1-d) << MdpMinorShift;
873 }
874
875 static inline int ROUND_UP(int a, int base)
876 {
877 return ((a+base-1)/base)*base;
878 }
879
880 static inline int is_subarray(char *vers)
881 {
882 /* The version string for a 'subarray' (an array in a container)
883 * is
884 * /containername/componentname for normal read-write arrays
885 * -containername/componentname for read-only arrays.
886 * containername is e.g. md0, md_d1
887 * componentname is dependant on the metadata. e.g. '1' 'S1' ...
888 */
889 return (*vers == '/' || *vers == '-');
890 }
891
892 #ifdef DEBUG
893 #define dprintf(fmt, arg...) \
894 fprintf(stderr, fmt, ##arg)
895 #else
896 #define dprintf(fmt, arg...) \
897 ({ if (0) fprintf(stderr, fmt, ##arg); 0; })
898 #endif
899 #include <assert.h>
900 #include <stdarg.h>
901 static inline int xasprintf(char **strp, const char *fmt, ...) {
902 va_list ap;
903 int ret;
904 va_start(ap, fmt);
905 ret = vasprintf(strp, fmt, ap);
906 va_end(ap);
907 assert(ret >= 0);
908 return ret;
909 }
910
911 #define LEVEL_MULTIPATH (-4)
912 #define LEVEL_LINEAR (-1)
913 #define LEVEL_FAULTY (-5)
914
915 /* kernel module doesn't know about these */
916 #define LEVEL_CONTAINER (-100)
917 #define LEVEL_UNSUPPORTED (-200)
918
919
920 /* faulty stuff */
921
922 #define WriteTransient 0
923 #define ReadTransient 1
924 #define WritePersistent 2
925 #define ReadPersistent 3
926 #define WriteAll 4 /* doesn't go to device */
927 #define ReadFixable 5
928 #define Modes 6
929
930 #define ClearErrors 31
931 #define ClearFaults 30
932
933 #define AllPersist 100 /* internal use only */
934 #define NoPersist 101
935
936 #define ModeMask 0x1f
937 #define ModeShift 5
938
939
940 #ifdef __TINYC__
941 #undef minor
942 #undef major
943 #undef makedev
944 #define minor(x) ((x)&0xff)
945 #define major(x) (((x)>>8)&0xff)
946 #define makedev(M,m) (((M)<<8) | (m))
947 #endif
948
949 /* for raid4/5/6 */
950 #define ALGORITHM_LEFT_ASYMMETRIC 0
951 #define ALGORITHM_RIGHT_ASYMMETRIC 1
952 #define ALGORITHM_LEFT_SYMMETRIC 2
953 #define ALGORITHM_RIGHT_SYMMETRIC 3
954
955 /* Define non-rotating (raid4) algorithms. These allow
956 * conversion of raid4 to raid5.
957 */
958 #define ALGORITHM_PARITY_0 4 /* P or P,Q are initial devices */
959 #define ALGORITHM_PARITY_N 5 /* P or P,Q are final devices. */
960
961 /* DDF RAID6 layouts differ from md/raid6 layouts in two ways.
962 * Firstly, the exact positioning of the parity block is slightly
963 * different between the 'LEFT_*' modes of md and the "_N_*" modes
964 * of DDF.
965 * Secondly, or order of datablocks over which the Q syndrome is computed
966 * is different.
967 * Consequently we have different layouts for DDF/raid6 than md/raid6.
968 * These layouts are from the DDFv1.2 spec.
969 * Interestingly DDFv1.2-Errata-A does not specify N_CONTINUE but
970 * leaves RLQ=3 as 'Vendor Specific'
971 */
972
973 #define ALGORITHM_ROTATING_ZERO_RESTART 8 /* DDF PRL=6 RLQ=1 */
974 #define ALGORITHM_ROTATING_N_RESTART 9 /* DDF PRL=6 RLQ=2 */
975 #define ALGORITHM_ROTATING_N_CONTINUE 10 /*DDF PRL=6 RLQ=3 */
976
977
978 /* For every RAID5 algorithm we define a RAID6 algorithm
979 * with exactly the same layout for data and parity, and
980 * with the Q block always on the last device (N-1).
981 * This allows trivial conversion from RAID5 to RAID6
982 */
983 #define ALGORITHM_LEFT_ASYMMETRIC_6 16
984 #define ALGORITHM_RIGHT_ASYMMETRIC_6 17
985 #define ALGORITHM_LEFT_SYMMETRIC_6 18
986 #define ALGORITHM_RIGHT_SYMMETRIC_6 19
987 #define ALGORITHM_PARITY_0_6 20
988 #define ALGORITHM_PARITY_N_6 ALGORITHM_PARITY_N
989