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