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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 | /* MAP_DIR should be somewhere that persists across the pivotroot | |
72 | * from early boot to late boot. | |
73 | * Currently /dev seems to be the only option on most distros. | |
74 | */ | |
75 | #ifndef MAP_DIR | |
76 | #define MAP_DIR "/dev/.mdadm" | |
77 | #endif /* MAP_DIR */ | |
78 | /* MAP_FILE is what we name the map file we put in MAP_DIR, in case you | |
79 | * want something other than the default of "map" | |
80 | */ | |
81 | #ifndef MAP_FILE | |
82 | #define MAP_FILE "map" | |
83 | #endif /* MAP_FILE */ | |
84 | /* MDMON_DIR is where pid and socket files used for communicating | |
85 | * with mdmon normally live. It *should* be /var/run, but when | |
86 | * mdmon is needed at early boot then it needs to write there prior | |
87 | * to /var/run being mounted read/write, and it also then needs to | |
88 | * persist beyond when /var/run is mounter read-only. So, to be | |
89 | * safe, the default is somewhere that is read/write early in the | |
90 | * boot process and stays up as long as possible during shutdown. | |
91 | */ | |
92 | #ifndef MDMON_DIR | |
93 | #define MDMON_DIR "/dev/.mdadm/" | |
94 | #endif /* MDMON_DIR */ | |
95 | ||
96 | #include "md_u.h" | |
97 | #include "md_p.h" | |
98 | #include "bitmap.h" | |
99 | #include "msg.h" | |
100 | ||
101 | #include <endian.h> | |
102 | /* Redhat don't like to #include <asm/byteorder.h>, and | |
103 | * some time include <linux/byteorder/xxx_endian.h> isn't enough, | |
104 | * and there is no standard conversion function so... */ | |
105 | /* And dietlibc doesn't think byteswap is ok, so.. */ | |
106 | /* #include <byteswap.h> */ | |
107 | #define bswap_16(x) (((x) & 0x00ffU) << 8 | \ | |
108 | ((x) & 0xff00U) >> 8) | |
109 | #define bswap_32(x) (((x) & 0x000000ffU) << 24 | \ | |
110 | ((x) & 0xff000000U) >> 24 | \ | |
111 | ((x) & 0x0000ff00U) << 8 | \ | |
112 | ((x) & 0x00ff0000U) >> 8) | |
113 | #define bswap_64(x) (((x) & 0x00000000000000ffULL) << 56 | \ | |
114 | ((x) & 0xff00000000000000ULL) >> 56 | \ | |
115 | ((x) & 0x000000000000ff00ULL) << 40 | \ | |
116 | ((x) & 0x00ff000000000000ULL) >> 40 | \ | |
117 | ((x) & 0x0000000000ff0000ULL) << 24 | \ | |
118 | ((x) & 0x0000ff0000000000ULL) >> 24 | \ | |
119 | ((x) & 0x00000000ff000000ULL) << 8 | \ | |
120 | ((x) & 0x000000ff00000000ULL) >> 8) | |
121 | ||
122 | #if !defined(__KLIBC__) | |
123 | #if BYTE_ORDER == LITTLE_ENDIAN | |
124 | #define __cpu_to_le16(_x) (_x) | |
125 | #define __cpu_to_le32(_x) (_x) | |
126 | #define __cpu_to_le64(_x) (_x) | |
127 | #define __le16_to_cpu(_x) (_x) | |
128 | #define __le32_to_cpu(_x) (_x) | |
129 | #define __le64_to_cpu(_x) (_x) | |
130 | ||
131 | #define __cpu_to_be16(_x) bswap_16(_x) | |
132 | #define __cpu_to_be32(_x) bswap_32(_x) | |
133 | #define __cpu_to_be64(_x) bswap_64(_x) | |
134 | #define __be16_to_cpu(_x) bswap_16(_x) | |
135 | #define __be32_to_cpu(_x) bswap_32(_x) | |
136 | #define __be64_to_cpu(_x) bswap_64(_x) | |
137 | #elif BYTE_ORDER == BIG_ENDIAN | |
138 | #define __cpu_to_le16(_x) bswap_16(_x) | |
139 | #define __cpu_to_le32(_x) bswap_32(_x) | |
140 | #define __cpu_to_le64(_x) bswap_64(_x) | |
141 | #define __le16_to_cpu(_x) bswap_16(_x) | |
142 | #define __le32_to_cpu(_x) bswap_32(_x) | |
143 | #define __le64_to_cpu(_x) bswap_64(_x) | |
144 | ||
145 | #define __cpu_to_be16(_x) (_x) | |
146 | #define __cpu_to_be32(_x) (_x) | |
147 | #define __cpu_to_be64(_x) (_x) | |
148 | #define __be16_to_cpu(_x) (_x) | |
149 | #define __be32_to_cpu(_x) (_x) | |
150 | #define __be64_to_cpu(_x) (_x) | |
151 | #else | |
152 | # error "unknown endianness." | |
153 | #endif | |
154 | #endif /* __KLIBC__ */ | |
155 | ||
156 | ||
157 | /* | |
158 | * min()/max()/clamp() macros that also do | |
159 | * strict type-checking.. See the | |
160 | * "unnecessary" pointer comparison. | |
161 | */ | |
162 | #define min(x, y) ({ \ | |
163 | typeof(x) _min1 = (x); \ | |
164 | typeof(y) _min2 = (y); \ | |
165 | (void) (&_min1 == &_min2); \ | |
166 | _min1 < _min2 ? _min1 : _min2; }) | |
167 | ||
168 | #define max(x, y) ({ \ | |
169 | typeof(x) _max1 = (x); \ | |
170 | typeof(y) _max2 = (y); \ | |
171 | (void) (&_max1 == &_max2); \ | |
172 | _max1 > _max2 ? _max1 : _max2; }) | |
173 | ||
174 | /* general information that might be extracted from a superblock */ | |
175 | struct mdinfo { | |
176 | mdu_array_info_t array; | |
177 | mdu_disk_info_t disk; | |
178 | __u64 events; | |
179 | int uuid[4]; | |
180 | char name[33]; | |
181 | unsigned long long data_offset; | |
182 | unsigned long long component_size; /* same as array.size, except in | |
183 | * sectors and up to 64bits. | |
184 | */ | |
185 | unsigned long long custom_array_size; /* size for non-default sized | |
186 | * arrays (in sectors) | |
187 | */ | |
188 | int reshape_active; | |
189 | unsigned long long reshape_progress; | |
190 | union { | |
191 | unsigned long long resync_start; /* per-array resync position */ | |
192 | unsigned long long recovery_start; /* per-device rebuild position */ | |
193 | #define MaxSector (~0ULL) /* resync/recovery complete position */ | |
194 | }; | |
195 | unsigned long safe_mode_delay; /* ms delay to mark clean */ | |
196 | int new_level, delta_disks, new_layout, new_chunk; | |
197 | int errors; | |
198 | unsigned long cache_size; /* size of raid456 stripe cache*/ | |
199 | int mismatch_cnt; | |
200 | char text_version[50]; | |
201 | void *update_private; /* for passing metadata-format | |
202 | * specific update data | |
203 | * between successive calls to | |
204 | * update_super() | |
205 | */ | |
206 | ||
207 | int container_member; /* for assembling external-metatdata arrays | |
208 | * This is to be used internally by metadata | |
209 | * handler only */ | |
210 | int container_enough; /* flag external handlers can set to | |
211 | * indicate that subarrays have not enough (-1), | |
212 | * enough to start (0), or all expected disks (1) */ | |
213 | char sys_name[20]; | |
214 | struct mdinfo *devs; | |
215 | struct mdinfo *next; | |
216 | ||
217 | /* Device info for mdmon: */ | |
218 | int recovery_fd; | |
219 | int state_fd; | |
220 | #define DS_FAULTY 1 | |
221 | #define DS_INSYNC 2 | |
222 | #define DS_WRITE_MOSTLY 4 | |
223 | #define DS_SPARE 8 | |
224 | #define DS_BLOCKED 16 | |
225 | #define DS_REMOVE 1024 | |
226 | #define DS_UNBLOCK 2048 | |
227 | int prev_state, curr_state, next_state; | |
228 | ||
229 | }; | |
230 | ||
231 | struct createinfo { | |
232 | int uid; | |
233 | int gid; | |
234 | int autof; | |
235 | int mode; | |
236 | int symlinks; | |
237 | struct supertype *supertype; | |
238 | }; | |
239 | ||
240 | #define Name "mdadm" | |
241 | ||
242 | enum mode { | |
243 | ASSEMBLE=1, | |
244 | BUILD, | |
245 | CREATE, | |
246 | MANAGE, | |
247 | MISC, | |
248 | MONITOR, | |
249 | GROW, | |
250 | INCREMENTAL, | |
251 | AUTODETECT, | |
252 | }; | |
253 | ||
254 | extern char short_options[]; | |
255 | extern char short_bitmap_options[]; | |
256 | extern char short_bitmap_auto_options[]; | |
257 | extern struct option long_options[]; | |
258 | extern char Version[], Usage[], Help[], OptionHelp[], | |
259 | Help_create[], Help_build[], Help_assemble[], Help_grow[], | |
260 | Help_incr[], | |
261 | Help_manage[], Help_misc[], Help_monitor[], Help_config[]; | |
262 | ||
263 | /* for option that don't have short equivilents, we assign arbitrary | |
264 | * small numbers. '1' means an undecorated option, so we start at '2'. | |
265 | * (note we must stop before we get to 65 i.e. 'A') | |
266 | */ | |
267 | enum special_options { | |
268 | AssumeClean = 2, | |
269 | BitmapChunk, | |
270 | WriteBehind, | |
271 | ReAdd, | |
272 | NoDegraded, | |
273 | Sparc22, | |
274 | BackupFile, /* 8 */ | |
275 | HomeHost, | |
276 | AutoHomeHost, | |
277 | Symlinks, | |
278 | AutoDetect, | |
279 | Waitclean, | |
280 | DetailPlatform, | |
281 | KillSubarray, | |
282 | UpdateSubarray, /* 16 */ | |
283 | }; | |
284 | ||
285 | /* structures read from config file */ | |
286 | /* List of mddevice names and identifiers | |
287 | * Identifiers can be: | |
288 | * uuid=128-hex-uuid | |
289 | * super-minor=decimal-minor-number-from-superblock | |
290 | * devices=comma,separated,list,of,device,names,with,wildcards | |
291 | * | |
292 | * If multiple fields are present, the intersection of all matching | |
293 | * devices is considered | |
294 | */ | |
295 | #define UnSet (0xfffe) | |
296 | typedef struct mddev_ident_s { | |
297 | char *devname; | |
298 | ||
299 | int uuid_set; | |
300 | int uuid[4]; | |
301 | char name[33]; | |
302 | ||
303 | int super_minor; | |
304 | ||
305 | char *devices; /* comma separated list of device | |
306 | * names with wild cards | |
307 | */ | |
308 | int level; | |
309 | int raid_disks; | |
310 | int spare_disks; | |
311 | struct supertype *st; | |
312 | int autof; /* 1 for normal, 2 for partitioned */ | |
313 | char *spare_group; | |
314 | char *bitmap_file; | |
315 | int bitmap_fd; | |
316 | ||
317 | char *container; /* /dev/whatever name of container, or | |
318 | * uuid of container. You would expect | |
319 | * this to be the 'devname' or UUID | |
320 | * of some other entry. | |
321 | */ | |
322 | char *member; /* subarray within a container */ | |
323 | ||
324 | struct mddev_ident_s *next; | |
325 | union { | |
326 | /* fields needed by different users of this structure */ | |
327 | int assembled; /* set when assembly succeeds */ | |
328 | }; | |
329 | } *mddev_ident_t; | |
330 | ||
331 | /* List of device names - wildcards expanded */ | |
332 | typedef struct mddev_dev_s { | |
333 | char *devname; | |
334 | char disposition; /* 'a' for add, 'r' for remove, 'f' for fail. | |
335 | * Not set for names read from .config | |
336 | */ | |
337 | char writemostly; /* 1 for 'set writemostly', 2 for 'clear writemostly' */ | |
338 | char re_add; | |
339 | char used; /* set when used */ | |
340 | struct mdinfo *content; /* If devname is a container, this might list | |
341 | * the remaining member arrays. */ | |
342 | struct mddev_dev_s *next; | |
343 | } *mddev_dev_t; | |
344 | ||
345 | typedef struct mapping { | |
346 | char *name; | |
347 | int num; | |
348 | } mapping_t; | |
349 | ||
350 | ||
351 | struct mdstat_ent { | |
352 | char *dev; | |
353 | int devnum; | |
354 | int active; | |
355 | char *level; | |
356 | char *pattern; /* U or up, _ for down */ | |
357 | int percent; /* -1 if no resync */ | |
358 | int resync; /* 1 if resync, 0 if recovery */ | |
359 | int devcnt; | |
360 | int raid_disks; | |
361 | int chunk_size; | |
362 | char * metadata_version; | |
363 | struct dev_member { | |
364 | char *name; | |
365 | struct dev_member *next; | |
366 | } *members; | |
367 | struct mdstat_ent *next; | |
368 | }; | |
369 | ||
370 | extern struct mdstat_ent *mdstat_read(int hold, int start); | |
371 | extern void free_mdstat(struct mdstat_ent *ms); | |
372 | extern void mdstat_wait(int seconds); | |
373 | extern void mdstat_wait_fd(int fd, const sigset_t *sigmask); | |
374 | extern int mddev_busy(int devnum); | |
375 | extern struct mdstat_ent *mdstat_by_component(char *name); | |
376 | ||
377 | struct map_ent { | |
378 | struct map_ent *next; | |
379 | int devnum; | |
380 | char metadata[20]; | |
381 | int uuid[4]; | |
382 | int bad; | |
383 | char *path; | |
384 | }; | |
385 | extern int map_update(struct map_ent **mpp, int devnum, char *metadata, | |
386 | int uuid[4], char *path); | |
387 | extern void map_remove(struct map_ent **map, int devnum); | |
388 | extern struct map_ent *map_by_uuid(struct map_ent **map, int uuid[4]); | |
389 | extern struct map_ent *map_by_devnum(struct map_ent **map, int devnum); | |
390 | extern struct map_ent *map_by_name(struct map_ent **map, char *name); | |
391 | extern void map_read(struct map_ent **melp); | |
392 | extern int map_write(struct map_ent *mel); | |
393 | extern void map_delete(struct map_ent **mapp, int devnum); | |
394 | extern void map_free(struct map_ent *map); | |
395 | extern void map_add(struct map_ent **melp, | |
396 | int devnum, char *metadata, int uuid[4], char *path); | |
397 | extern int map_lock(struct map_ent **melp); | |
398 | extern void map_unlock(struct map_ent **melp); | |
399 | ||
400 | /* various details can be requested */ | |
401 | enum sysfs_read_flags { | |
402 | GET_LEVEL = (1 << 0), | |
403 | GET_LAYOUT = (1 << 1), | |
404 | GET_COMPONENT = (1 << 2), | |
405 | GET_CHUNK = (1 << 3), | |
406 | GET_CACHE = (1 << 4), | |
407 | GET_MISMATCH = (1 << 5), | |
408 | GET_VERSION = (1 << 6), | |
409 | GET_DISKS = (1 << 7), | |
410 | GET_DEGRADED = (1 << 8), | |
411 | GET_SAFEMODE = (1 << 9), | |
412 | GET_DEVS = (1 << 10), /* gets role, major, minor */ | |
413 | GET_OFFSET = (1 << 11), | |
414 | GET_SIZE = (1 << 12), | |
415 | GET_STATE = (1 << 13), | |
416 | GET_ERROR = (1 << 14), | |
417 | }; | |
418 | ||
419 | /* If fd >= 0, get the array it is open on, | |
420 | * else use devnum. >=0 -> major9. <0..... | |
421 | */ | |
422 | extern int sysfs_open(int devnum, char *devname, char *attr); | |
423 | extern void sysfs_init(struct mdinfo *mdi, int fd, int devnum); | |
424 | extern void sysfs_free(struct mdinfo *sra); | |
425 | extern struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options); | |
426 | extern int sysfs_attr_match(const char *attr, const char *str); | |
427 | extern int sysfs_match_word(const char *word, char **list); | |
428 | extern int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev, | |
429 | char *name, char *val); | |
430 | extern int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev, | |
431 | char *name, unsigned long long val); | |
432 | extern int sysfs_uevent(struct mdinfo *sra, char *event); | |
433 | extern int sysfs_get_fd(struct mdinfo *sra, struct mdinfo *dev, | |
434 | char *name); | |
435 | extern int sysfs_fd_get_ll(int fd, unsigned long long *val); | |
436 | extern int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev, | |
437 | char *name, unsigned long long *val); | |
438 | extern int sysfs_fd_get_str(int fd, char *val, int size); | |
439 | extern int sysfs_get_str(struct mdinfo *sra, struct mdinfo *dev, | |
440 | char *name, char *val, int size); | |
441 | extern int sysfs_set_safemode(struct mdinfo *sra, unsigned long ms); | |
442 | extern int sysfs_set_array(struct mdinfo *info, int vers); | |
443 | extern int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd, int resume); | |
444 | extern int sysfs_disk_to_scsi_id(int fd, __u32 *id); | |
445 | extern int sysfs_unique_holder(int devnum, long rdev); | |
446 | extern int load_sys(char *path, char *buf); | |
447 | ||
448 | ||
449 | extern int save_stripes(int *source, unsigned long long *offsets, | |
450 | int raid_disks, int chunk_size, int level, int layout, | |
451 | int nwrites, int *dest, | |
452 | unsigned long long start, unsigned long long length, | |
453 | char *buf); | |
454 | extern int restore_stripes(int *dest, unsigned long long *offsets, | |
455 | int raid_disks, int chunk_size, int level, int layout, | |
456 | int source, unsigned long long read_offset, | |
457 | unsigned long long start, unsigned long long length); | |
458 | ||
459 | #ifndef Sendmail | |
460 | #define Sendmail "/usr/lib/sendmail -t" | |
461 | #endif | |
462 | ||
463 | #define SYSLOG_FACILITY LOG_DAEMON | |
464 | ||
465 | extern char *map_num(mapping_t *map, int num); | |
466 | extern int map_name(mapping_t *map, char *name); | |
467 | extern mapping_t r5layout[], r6layout[], pers[], modes[], faultylayout[]; | |
468 | ||
469 | extern char *map_dev(int major, int minor, int create); | |
470 | ||
471 | struct active_array; | |
472 | struct metadata_update; | |
473 | ||
474 | /* A superswitch provides entry point the a metadata handler. | |
475 | * | |
476 | * The super_switch primarily operates on some "metadata" that | |
477 | * is accessed via the 'supertype'. | |
478 | * This metadata has one of three possible sources. | |
479 | * 1/ It is read from a single device. In this case it may not completely | |
480 | * describe the array or arrays as some information might be on other | |
481 | * devices. | |
482 | * 2/ It is read from all devices in a container. In this case all | |
483 | * information is present. | |
484 | * 3/ It is created by ->init_super / ->add_to_super. In this case it will | |
485 | * be complete once enough ->add_to_super calls have completed. | |
486 | * | |
487 | * When creating an array inside a container, the metadata will be | |
488 | * formed by a combination of 2 and 3. The metadata or the array is read, | |
489 | * then new information is added. | |
490 | * | |
491 | * The metadata must sometimes have a concept of a 'current' array | |
492 | * and a 'current' device. | |
493 | * The 'current' array is set by init_super to be the newly created array, | |
494 | * or is set by super_by_fd when it finds it is looking at an array inside | |
495 | * a container. | |
496 | * | |
497 | * The 'current' device is either the device that the metadata was read from | |
498 | * in case 1, or the last device added by add_to_super in case 3. | |
499 | * Case 2 does not identify a 'current' device. | |
500 | */ | |
501 | extern struct superswitch { | |
502 | ||
503 | /* Used to report details of metadata read from a component | |
504 | * device. ->load_super has been called. | |
505 | */ | |
506 | void (*examine_super)(struct supertype *st, char *homehost); | |
507 | void (*brief_examine_super)(struct supertype *st, int verbose); | |
508 | void (*brief_examine_subarrays)(struct supertype *st, int verbose); | |
509 | void (*export_examine_super)(struct supertype *st); | |
510 | ||
511 | /* Used to report details of an active array. | |
512 | * ->load_super was possibly given a 'component' string. | |
513 | */ | |
514 | void (*detail_super)(struct supertype *st, char *homehost); | |
515 | void (*brief_detail_super)(struct supertype *st); | |
516 | void (*export_detail_super)(struct supertype *st); | |
517 | ||
518 | /* Optional: platform hardware / firmware details */ | |
519 | int (*detail_platform)(int verbose, int enumerate_only); | |
520 | ||
521 | /* Used: | |
522 | * to get uuid to storing in bitmap metadata | |
523 | * and 'reshape' backup-data metadata | |
524 | * To see if a device is being re-added to an array it was part of. | |
525 | */ | |
526 | void (*uuid_from_super)(struct supertype *st, int uuid[4]); | |
527 | ||
528 | /* Extract generic details from metadata. This could be details about | |
529 | * the container, or about an individual array within the container. | |
530 | * The determination is made either by: | |
531 | * load_super being given a 'component' string. | |
532 | * validate_geometry determining what to create. | |
533 | * The info includes both array information and device information. | |
534 | * The particular device should be: | |
535 | * The last device added by add_to_super | |
536 | * The device the metadata was loaded from by load_super | |
537 | */ | |
538 | void (*getinfo_super)(struct supertype *st, struct mdinfo *info); | |
539 | ||
540 | /* Check if the given metadata is flagged as belonging to "this" | |
541 | * host. 0 for 'no', 1 for 'yes', -1 for "Don't record homehost" | |
542 | */ | |
543 | int (*match_home)(struct supertype *st, char *homehost); | |
544 | ||
545 | /* Make one of several generic modifications to metadata | |
546 | * prior to assembly (or other times). | |
547 | * sparc2.2 - first bug in early 0.90 metadata | |
548 | * super-minor - change name of 0.90 metadata | |
549 | * summaries - 'correct' any redundant data | |
550 | * resync - mark array as dirty to trigger a resync. | |
551 | * uuid - set new uuid - only 0.90 or 1.x | |
552 | * name - change the name of the array (where supported) | |
553 | * homehost - change which host this array is tied to. | |
554 | * devicesize - If metadata is at start of device, change recorded | |
555 | * device size to match actual device size | |
556 | * byteorder - swap bytes for 0.90 metadata | |
557 | * | |
558 | * force-one - mark that device as uptodate, not old or failed. | |
559 | * force-array - mark array as clean if it would not otherwise | |
560 | * assemble | |
561 | * assemble - not sure how this is different from force-one... | |
562 | * linear-grow-new - add a new device to a linear array, but don't | |
563 | * change the size: so superblock still matches | |
564 | * linear-grow-update - now change the size of the array. | |
565 | */ | |
566 | int (*update_super)(struct supertype *st, struct mdinfo *info, | |
567 | char *update, | |
568 | char *devname, int verbose, | |
569 | int uuid_set, char *homehost); | |
570 | ||
571 | /* Create new metadata for new array as described. This could | |
572 | * be a new container, or an array in a pre-existing container. | |
573 | * Also used to zero metadata prior to writing it to invalidate old | |
574 | * metadata. | |
575 | */ | |
576 | int (*init_super)(struct supertype *st, mdu_array_info_t *info, | |
577 | unsigned long long size, char *name, | |
578 | char *homehost, int *uuid); | |
579 | ||
580 | /* update the metadata to include new device, either at create or | |
581 | * when hot-adding a spare. | |
582 | */ | |
583 | int (*add_to_super)(struct supertype *st, mdu_disk_info_t *dinfo, | |
584 | int fd, char *devname); | |
585 | ||
586 | /* Write metadata to one device when fixing problems or adding | |
587 | * a new device. | |
588 | */ | |
589 | int (*store_super)(struct supertype *st, int fd); | |
590 | ||
591 | /* Write all metadata for this array. | |
592 | */ | |
593 | int (*write_init_super)(struct supertype *st); | |
594 | int (*compare_super)(struct supertype *st, struct supertype *tst); | |
595 | int (*load_super)(struct supertype *st, int fd, char *devname); | |
596 | struct supertype * (*match_metadata_desc)(char *arg); | |
597 | __u64 (*avail_size)(struct supertype *st, __u64 size); | |
598 | int (*add_internal_bitmap)(struct supertype *st, int *chunkp, | |
599 | int delay, int write_behind, | |
600 | unsigned long long size, int may_change, int major); | |
601 | void (*locate_bitmap)(struct supertype *st, int fd); | |
602 | int (*write_bitmap)(struct supertype *st, int fd); | |
603 | void (*free_super)(struct supertype *st); | |
604 | ||
605 | /* validate_geometry is called with an st returned by | |
606 | * match_metadata_desc. | |
607 | * It should check that the geometry described in compatible with | |
608 | * the metadata type. It will be called repeatedly as devices | |
609 | * added to validate changing size and new devices. If there are | |
610 | * inter-device dependencies, it should record sufficient details | |
611 | * so these can be validated. | |
612 | * Both 'size' and '*freesize' are in sectors. chunk is bytes. | |
613 | */ | |
614 | int (*validate_geometry)(struct supertype *st, int level, int layout, | |
615 | int raiddisks, | |
616 | int chunk, unsigned long long size, | |
617 | char *subdev, unsigned long long *freesize, | |
618 | int verbose); | |
619 | ||
620 | struct mdinfo *(*container_content)(struct supertype *st); | |
621 | /* Allow a metadata handler to override mdadm's default layouts */ | |
622 | int (*default_layout)(int level); /* optional */ | |
623 | /* query the supertype for default chunk size */ | |
624 | int (*default_chunk)(struct supertype *st); /* optional */ | |
625 | /* Permit subarray's to be deleted from inactive containers */ | |
626 | int (*kill_subarray)(struct supertype *st); /* optional */ | |
627 | /* Permit subarray's to be modified */ | |
628 | int (*update_subarray)(struct supertype *st, char *update, mddev_ident_t ident); /* optional */ | |
629 | ||
630 | /* for mdmon */ | |
631 | int (*open_new)(struct supertype *c, struct active_array *a, | |
632 | char *inst); | |
633 | ||
634 | /* Tell the metadata handler the current state of the array. | |
635 | * This covers whether it is known to be consistent (no pending writes) | |
636 | * and how far along a resync is known to have progressed | |
637 | * (in a->resync_start). | |
638 | * resync status is really irrelevant if the array is not consistent, | |
639 | * but some metadata (DDF!) have a place to record the distinction. | |
640 | * If 'consistent' is '2', then the array can mark it dirty if a | |
641 | * resync/recovery/whatever is required, or leave it clean if not. | |
642 | * Return value is 0 dirty (not consistent) and 1 if clean. | |
643 | * it is only really important if consistent is passed in as '2'. | |
644 | */ | |
645 | int (*set_array_state)(struct active_array *a, int consistent); | |
646 | ||
647 | /* When the state of a device might have changed, we call set_disk to | |
648 | * tell the metadata what the current state is. | |
649 | * Typically this happens on spare->in_sync and (spare|in_sync)->faulty | |
650 | * transitions. | |
651 | * set_disk might be called when the state of the particular disk has | |
652 | * not in fact changed. | |
653 | */ | |
654 | void (*set_disk)(struct active_array *a, int n, int state); | |
655 | void (*sync_metadata)(struct supertype *st); | |
656 | void (*process_update)(struct supertype *st, | |
657 | struct metadata_update *update); | |
658 | void (*prepare_update)(struct supertype *st, | |
659 | struct metadata_update *update); | |
660 | ||
661 | /* activate_spare will check if the array is degraded and, if it | |
662 | * is, try to find some spare space in the container. | |
663 | * On success, it add appropriate updates (For process_update) to | |
664 | * to the 'updates' list and returns a list of 'mdinfo' identifying | |
665 | * the device, or devices as there might be multiple missing | |
666 | * devices and multiple spares available. | |
667 | */ | |
668 | struct mdinfo *(*activate_spare)(struct active_array *a, | |
669 | struct metadata_update **updates); | |
670 | ||
671 | int swapuuid; /* true if uuid is bigending rather than hostendian */ | |
672 | int external; | |
673 | const char *name; /* canonical metadata name */ | |
674 | } super0, super1, super_ddf, *superlist[]; | |
675 | ||
676 | extern struct superswitch super_imsm; | |
677 | ||
678 | struct metadata_update { | |
679 | int len; | |
680 | char *buf; | |
681 | void *space; /* allocated space that monitor will use */ | |
682 | struct metadata_update *next; | |
683 | }; | |
684 | ||
685 | /* A supertype holds a particular collection of metadata. | |
686 | * It identifies the metadata type by the superswitch, and the particular | |
687 | * sub-version of that metadata type. | |
688 | * metadata read in or created is stored in 'sb' and 'info'. | |
689 | * There are also fields used by mdmon to track containers. | |
690 | * | |
691 | * A supertype may refer to: | |
692 | * Just an array, possibly in a container | |
693 | * A container, not identifying any particular array | |
694 | * Info read from just one device, not yet fully describing the array/container. | |
695 | * | |
696 | * | |
697 | * A supertype is created by: | |
698 | * super_by_fd | |
699 | * guess_super | |
700 | * dup_super | |
701 | */ | |
702 | struct supertype { | |
703 | struct superswitch *ss; | |
704 | int minor_version; | |
705 | int max_devs; | |
706 | int container_dev; /* devnum of container */ | |
707 | char subarray[32]; /* name of array inside container */ | |
708 | void *sb; | |
709 | void *info; | |
710 | int loaded_container; /* Set if load_super found a container, | |
711 | * not just one device */ | |
712 | ||
713 | struct metadata_update *updates; | |
714 | struct metadata_update **update_tail; | |
715 | ||
716 | /* extra stuff used by mdmon */ | |
717 | struct active_array *arrays; | |
718 | int sock; /* listen to external programs */ | |
719 | int devnum; | |
720 | char *devname; /* e.g. md0. This appears in metadata_verison: | |
721 | * external:/md0/12 | |
722 | */ | |
723 | int devcnt; | |
724 | ||
725 | struct mdinfo *devs; | |
726 | ||
727 | }; | |
728 | ||
729 | extern struct supertype *super_by_fd(int fd); | |
730 | extern struct supertype *guess_super(int fd); | |
731 | extern struct supertype *dup_super(struct supertype *st); | |
732 | extern int get_dev_size(int fd, char *dname, unsigned long long *sizep); | |
733 | extern void get_one_disk(int mdfd, mdu_array_info_t *ainf, | |
734 | mdu_disk_info_t *disk); | |
735 | void wait_for(char *dev, int fd); | |
736 | ||
737 | #if __GNUC__ < 3 | |
738 | struct stat64; | |
739 | #endif | |
740 | ||
741 | #define HAVE_NFTW we assume | |
742 | #define HAVE_FTW | |
743 | ||
744 | #ifdef __UCLIBC__ | |
745 | # include <features.h> | |
746 | # ifndef __UCLIBC_HAS_LFS__ | |
747 | # define lseek64 lseek | |
748 | # endif | |
749 | # ifndef __UCLIBC_HAS_FTW__ | |
750 | # undef HAVE_FTW | |
751 | # undef HAVE_NFTW | |
752 | # endif | |
753 | #endif | |
754 | ||
755 | #ifdef __dietlibc__ | |
756 | # undef HAVE_NFTW | |
757 | #endif | |
758 | ||
759 | #if defined(__KLIBC__) | |
760 | # undef HAVE_NFTW | |
761 | # undef HAVE_FTW | |
762 | #endif | |
763 | ||
764 | #ifndef HAVE_NFTW | |
765 | # define FTW_PHYS 1 | |
766 | # ifndef HAVE_FTW | |
767 | struct FTW {}; | |
768 | # endif | |
769 | #endif | |
770 | ||
771 | #ifdef HAVE_FTW | |
772 | # include <ftw.h> | |
773 | #endif | |
774 | ||
775 | extern int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s); | |
776 | ||
777 | ||
778 | extern int Manage_ro(char *devname, int fd, int readonly); | |
779 | extern int Manage_runstop(char *devname, int fd, int runstop, int quiet); | |
780 | extern int Manage_resize(char *devname, int fd, long long size, int raid_disks); | |
781 | extern int Manage_subdevs(char *devname, int fd, | |
782 | mddev_dev_t devlist, int verbose, int test); | |
783 | extern int autodetect(void); | |
784 | extern int Grow_Add_device(char *devname, int fd, char *newdev); | |
785 | extern int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int write_behind, int force); | |
786 | extern int Grow_reshape(char *devname, int fd, int quiet, char *backup_file, | |
787 | long long size, | |
788 | int level, char *layout_str, int chunksize, int raid_disks); | |
789 | extern int Grow_restart(struct supertype *st, struct mdinfo *info, | |
790 | int *fdlist, int cnt, char *backup_file, int verbose); | |
791 | extern int Grow_continue(int mdfd, struct supertype *st, | |
792 | struct mdinfo *info, char *backup_file); | |
793 | ||
794 | extern int Assemble(struct supertype *st, char *mddev, | |
795 | mddev_ident_t ident, | |
796 | mddev_dev_t devlist, char *backup_file, | |
797 | int readonly, int runstop, | |
798 | char *update, char *homehost, int require_homehost, | |
799 | int verbose, int force); | |
800 | ||
801 | extern int Build(char *mddev, int chunk, int level, int layout, | |
802 | int raiddisks, mddev_dev_t devlist, int assume_clean, | |
803 | char *bitmap_file, int bitmap_chunk, int write_behind, | |
804 | int delay, int verbose, int autof, unsigned long long size); | |
805 | ||
806 | ||
807 | extern int Create(struct supertype *st, char *mddev, | |
808 | int chunk, int level, int layout, unsigned long long size, int raiddisks, int sparedisks, | |
809 | char *name, char *homehost, int *uuid, | |
810 | int subdevs, mddev_dev_t devlist, | |
811 | int runstop, int verbose, int force, int assume_clean, | |
812 | char *bitmap_file, int bitmap_chunk, int write_behind, int delay, int autof); | |
813 | ||
814 | extern int Detail(char *dev, int brief, int export, int test, char *homehost); | |
815 | extern int Detail_Platform(struct superswitch *ss, int scan, int verbose); | |
816 | extern int Query(char *dev); | |
817 | extern int Examine(mddev_dev_t devlist, int brief, int export, int scan, | |
818 | int SparcAdjust, struct supertype *forcest, char *homehost); | |
819 | extern int Monitor(mddev_dev_t devlist, | |
820 | char *mailaddr, char *alert_cmd, | |
821 | int period, int daemonise, int scan, int oneshot, | |
822 | int dosyslog, int test, char *pidfile, int increments); | |
823 | ||
824 | extern int Kill(char *dev, struct supertype *st, int force, int quiet, int noexcl); | |
825 | extern int Kill_subarray(char *dev, char *subarray, int quiet); | |
826 | extern int Update_subarray(char *dev, char *subarray, char *update, mddev_ident_t ident, int quiet); | |
827 | extern int Wait(char *dev); | |
828 | extern int WaitClean(char *dev, int sock, int verbose); | |
829 | ||
830 | extern int Incremental(char *devname, int verbose, int runstop, | |
831 | struct supertype *st, char *homehost, int require_homehost, | |
832 | int autof); | |
833 | extern int Incremental_container(struct supertype *st, char *devname, | |
834 | int verbose, int runstop, int autof, | |
835 | int trustworthy); | |
836 | extern void RebuildMap(void); | |
837 | extern int IncrementalScan(int verbose); | |
838 | extern int IncrementalRemove(char *devname, int verbose); | |
839 | extern int CreateBitmap(char *filename, int force, char uuid[16], | |
840 | unsigned long chunksize, unsigned long daemon_sleep, | |
841 | unsigned long write_behind, | |
842 | unsigned long long array_size, | |
843 | int major); | |
844 | extern int ExamineBitmap(char *filename, int brief, struct supertype *st); | |
845 | extern int bitmap_update_uuid(int fd, int *uuid, int swap); | |
846 | extern unsigned long bitmap_sectors(struct bitmap_super_s *bsb); | |
847 | ||
848 | extern int md_get_version(int fd); | |
849 | extern int get_linux_version(void); | |
850 | extern long long parse_size(char *size); | |
851 | extern int parse_uuid(char *str, int uuid[4]); | |
852 | extern int parse_layout_10(char *layout); | |
853 | extern int parse_layout_faulty(char *layout); | |
854 | extern int check_ext2(int fd, char *name); | |
855 | extern int check_reiser(int fd, char *name); | |
856 | extern int check_raid(int fd, char *name); | |
857 | extern int check_partitions(int fd, char *dname, unsigned long long freesize); | |
858 | ||
859 | extern int get_mdp_major(void); | |
860 | extern int dev_open(char *dev, int flags); | |
861 | extern int open_dev(int devnum); | |
862 | extern int open_dev_excl(int devnum); | |
863 | extern int is_standard(char *dev, int *nump); | |
864 | extern int same_dev(char *one, char *two); | |
865 | ||
866 | extern int parse_auto(char *str, char *msg, int config); | |
867 | extern mddev_ident_t conf_get_ident(char *dev); | |
868 | extern mddev_dev_t conf_get_devs(void); | |
869 | extern int conf_test_dev(char *devname); | |
870 | extern int conf_test_metadata(const char *version, int is_homehost); | |
871 | extern struct createinfo *conf_get_create_info(void); | |
872 | extern void set_conffile(char *file); | |
873 | extern char *conf_get_mailaddr(void); | |
874 | extern char *conf_get_mailfrom(void); | |
875 | extern char *conf_get_program(void); | |
876 | extern char *conf_get_homehost(int *require_homehostp); | |
877 | extern char *conf_line(FILE *file); | |
878 | extern char *conf_word(FILE *file, int allow_key); | |
879 | extern int conf_name_is_free(char *name); | |
880 | extern int devname_matches(char *name, char *match); | |
881 | extern struct mddev_ident_s *conf_match(struct mdinfo *info, struct supertype *st); | |
882 | ||
883 | extern void free_line(char *line); | |
884 | extern int match_oneof(char *devices, char *devname); | |
885 | extern void uuid_from_super(int uuid[4], mdp_super_t *super); | |
886 | extern const int uuid_match_any[4]; | |
887 | extern int same_uuid(int a[4], int b[4], int swapuuid); | |
888 | extern void copy_uuid(void *a, int b[4], int swapuuid); | |
889 | extern char *__fname_from_uuid(int id[4], int swap, char *buf, char sep); | |
890 | extern char *fname_from_uuid(struct supertype *st, | |
891 | struct mdinfo *info, char *buf, char sep); | |
892 | extern unsigned long calc_csum(void *super, int bytes); | |
893 | extern int enough(int level, int raid_disks, int layout, int clean, | |
894 | char *avail, int avail_disks); | |
895 | extern int ask(char *mesg); | |
896 | extern unsigned long long get_component_size(int fd); | |
897 | extern void remove_partitions(int fd); | |
898 | extern int test_partition(int fd); | |
899 | extern unsigned long long calc_array_size(int level, int raid_disks, int layout, | |
900 | int chunksize, unsigned long long devsize); | |
901 | extern int flush_metadata_updates(struct supertype *st); | |
902 | extern void append_metadata_update(struct supertype *st, void *buf, int len); | |
903 | extern int assemble_container_content(struct supertype *st, int mdfd, | |
904 | struct mdinfo *content, int runstop, | |
905 | char *chosen_name, int verbose); | |
906 | ||
907 | extern int add_disk(int mdfd, struct supertype *st, | |
908 | struct mdinfo *sra, struct mdinfo *info); | |
909 | extern int set_array_info(int mdfd, struct supertype *st, struct mdinfo *info); | |
910 | unsigned long long min_recovery_start(struct mdinfo *array); | |
911 | ||
912 | extern char *human_size(long long bytes); | |
913 | extern char *human_size_brief(long long bytes); | |
914 | extern void print_r10_layout(int layout); | |
915 | ||
916 | #define NoMdDev (1<<23) | |
917 | extern int find_free_devnum(int use_partitions); | |
918 | ||
919 | extern void put_md_name(char *name); | |
920 | extern char *get_md_name(int dev); | |
921 | ||
922 | extern char DefaultConfFile[]; | |
923 | ||
924 | extern int create_mddev(char *dev, char *name, int autof, int trustworthy, | |
925 | char *chosen); | |
926 | /* values for 'trustworthy' */ | |
927 | #define LOCAL 1 | |
928 | #define LOCAL_ANY 10 | |
929 | #define FOREIGN 2 | |
930 | #define METADATA 3 | |
931 | extern int open_mddev(char *dev, int report_errors); | |
932 | extern int open_container(int fd); | |
933 | extern int is_container_member(struct mdstat_ent *ent, char *devname); | |
934 | extern int is_subarray_active(char *subarray, char *devname); | |
935 | int is_container_active(char *devname); | |
936 | extern int open_subarray(char *dev, struct supertype *st, int quiet); | |
937 | extern struct superswitch *version_to_superswitch(char *vers); | |
938 | ||
939 | extern int mdmon_running(int devnum); | |
940 | extern int mdmon_pid(int devnum); | |
941 | extern int check_env(char *name); | |
942 | extern __u32 random32(void); | |
943 | extern int start_mdmon(int devnum); | |
944 | ||
945 | extern char *devnum2devname(int num); | |
946 | extern int devname2devnum(char *name); | |
947 | extern int stat2devnum(struct stat *st); | |
948 | extern int fd2devnum(int fd); | |
949 | ||
950 | static inline int dev2major(int d) | |
951 | { | |
952 | if (d >= 0) | |
953 | return MD_MAJOR; | |
954 | else | |
955 | return get_mdp_major(); | |
956 | } | |
957 | ||
958 | static inline int dev2minor(int d) | |
959 | { | |
960 | if (d >= 0) | |
961 | return d; | |
962 | return (-1-d) << MdpMinorShift; | |
963 | } | |
964 | ||
965 | static inline int ROUND_UP(int a, int base) | |
966 | { | |
967 | return ((a+base-1)/base)*base; | |
968 | } | |
969 | ||
970 | static inline int is_subarray(char *vers) | |
971 | { | |
972 | /* The version string for a 'subarray' (an array in a container) | |
973 | * is | |
974 | * /containername/componentname for normal read-write arrays | |
975 | * -containername/componentname for read-only arrays. | |
976 | * containername is e.g. md0, md_d1 | |
977 | * componentname is dependant on the metadata. e.g. '1' 'S1' ... | |
978 | */ | |
979 | return (*vers == '/' || *vers == '-'); | |
980 | } | |
981 | ||
982 | #ifdef DEBUG | |
983 | #define dprintf(fmt, arg...) \ | |
984 | fprintf(stderr, fmt, ##arg) | |
985 | #else | |
986 | #define dprintf(fmt, arg...) \ | |
987 | ({ if (0) fprintf(stderr, fmt, ##arg); 0; }) | |
988 | #endif | |
989 | #include <assert.h> | |
990 | #include <stdarg.h> | |
991 | static inline int xasprintf(char **strp, const char *fmt, ...) { | |
992 | va_list ap; | |
993 | int ret; | |
994 | va_start(ap, fmt); | |
995 | ret = vasprintf(strp, fmt, ap); | |
996 | va_end(ap); | |
997 | assert(ret >= 0); | |
998 | return ret; | |
999 | } | |
1000 | ||
1001 | #define LEVEL_MULTIPATH (-4) | |
1002 | #define LEVEL_LINEAR (-1) | |
1003 | #define LEVEL_FAULTY (-5) | |
1004 | ||
1005 | /* kernel module doesn't know about these */ | |
1006 | #define LEVEL_CONTAINER (-100) | |
1007 | #define LEVEL_UNSUPPORTED (-200) | |
1008 | ||
1009 | ||
1010 | /* faulty stuff */ | |
1011 | ||
1012 | #define WriteTransient 0 | |
1013 | #define ReadTransient 1 | |
1014 | #define WritePersistent 2 | |
1015 | #define ReadPersistent 3 | |
1016 | #define WriteAll 4 /* doesn't go to device */ | |
1017 | #define ReadFixable 5 | |
1018 | #define Modes 6 | |
1019 | ||
1020 | #define ClearErrors 31 | |
1021 | #define ClearFaults 30 | |
1022 | ||
1023 | #define AllPersist 100 /* internal use only */ | |
1024 | #define NoPersist 101 | |
1025 | ||
1026 | #define ModeMask 0x1f | |
1027 | #define ModeShift 5 | |
1028 | ||
1029 | ||
1030 | #ifdef __TINYC__ | |
1031 | #undef minor | |
1032 | #undef major | |
1033 | #undef makedev | |
1034 | #define minor(x) ((x)&0xff) | |
1035 | #define major(x) (((x)>>8)&0xff) | |
1036 | #define makedev(M,m) (((M)<<8) | (m)) | |
1037 | #endif | |
1038 | ||
1039 | /* for raid4/5/6 */ | |
1040 | #define ALGORITHM_LEFT_ASYMMETRIC 0 | |
1041 | #define ALGORITHM_RIGHT_ASYMMETRIC 1 | |
1042 | #define ALGORITHM_LEFT_SYMMETRIC 2 | |
1043 | #define ALGORITHM_RIGHT_SYMMETRIC 3 | |
1044 | ||
1045 | /* Define non-rotating (raid4) algorithms. These allow | |
1046 | * conversion of raid4 to raid5. | |
1047 | */ | |
1048 | #define ALGORITHM_PARITY_0 4 /* P or P,Q are initial devices */ | |
1049 | #define ALGORITHM_PARITY_N 5 /* P or P,Q are final devices. */ | |
1050 | ||
1051 | /* DDF RAID6 layouts differ from md/raid6 layouts in two ways. | |
1052 | * Firstly, the exact positioning of the parity block is slightly | |
1053 | * different between the 'LEFT_*' modes of md and the "_N_*" modes | |
1054 | * of DDF. | |
1055 | * Secondly, or order of datablocks over which the Q syndrome is computed | |
1056 | * is different. | |
1057 | * Consequently we have different layouts for DDF/raid6 than md/raid6. | |
1058 | * These layouts are from the DDFv1.2 spec. | |
1059 | * Interestingly DDFv1.2-Errata-A does not specify N_CONTINUE but | |
1060 | * leaves RLQ=3 as 'Vendor Specific' | |
1061 | */ | |
1062 | ||
1063 | #define ALGORITHM_ROTATING_ZERO_RESTART 8 /* DDF PRL=6 RLQ=1 */ | |
1064 | #define ALGORITHM_ROTATING_N_RESTART 9 /* DDF PRL=6 RLQ=2 */ | |
1065 | #define ALGORITHM_ROTATING_N_CONTINUE 10 /*DDF PRL=6 RLQ=3 */ | |
1066 | ||
1067 | ||
1068 | /* For every RAID5 algorithm we define a RAID6 algorithm | |
1069 | * with exactly the same layout for data and parity, and | |
1070 | * with the Q block always on the last device (N-1). | |
1071 | * This allows trivial conversion from RAID5 to RAID6 | |
1072 | */ | |
1073 | #define ALGORITHM_LEFT_ASYMMETRIC_6 16 | |
1074 | #define ALGORITHM_RIGHT_ASYMMETRIC_6 17 | |
1075 | #define ALGORITHM_LEFT_SYMMETRIC_6 18 | |
1076 | #define ALGORITHM_RIGHT_SYMMETRIC_6 19 | |
1077 | #define ALGORITHM_PARITY_0_6 20 | |
1078 | #define ALGORITHM_PARITY_N_6 ALGORITHM_PARITY_N | |
1079 | ||
1080 | /* Define PATH_MAX in case we don't use glibc or standard library does | |
1081 | * not have PATH_MAX defined. Assume max path length is 4K characters. | |
1082 | */ | |
1083 | #ifndef PATH_MAX | |
1084 | #define PATH_MAX 4096 | |
1085 | #endif | |
1086 |