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Exit when there are no more arrays to manage.
[thirdparty/mdadm.git] / mdadm.h
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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__)
34extern __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 */
139struct mdinfo {
140 mdu_array_info_t array;
141 mdu_disk_info_t disk;
142 __u64 events;
143 int uuid[4];
144 char name[33];
145 unsigned long long data_offset;
146 unsigned long long component_size; /* same as array.size, except in
147 * sectors and up to 64bits.
148 */
149 int reshape_active;
150 unsigned long long reshape_progress;
151 unsigned long long resync_start;
152 int new_level, delta_disks, new_layout, new_chunk;
153 int errors;
154 int cache_size; /* size of raid456 stripe cache*/
155 int mismatch_cnt;
156 char text_version[50];
157 int container_member; /* for assembling external-metatdata arrays */
158
159 char sys_name[20];
160 struct mdinfo *devs;
161 struct mdinfo *next;
162
163 /* Device info for mdmon: */
164 int state_fd;
165 #define DS_FAULTY 1
166 #define DS_INSYNC 2
167 #define DS_WRITE_MOSTLY 4
168 #define DS_SPARE 8
169 #define DS_BLOCKED 16
170 #define DS_REMOVE 1024
171 int prev_state, curr_state, next_state;
172
173};
174
175struct createinfo {
176 int uid;
177 int gid;
178 int autof;
179 int mode;
180 int symlinks;
181 struct supertype *supertype;
182};
183
184#define Name "mdadm"
185
186enum mode {
187 ASSEMBLE=1,
188 BUILD,
189 CREATE,
190 MANAGE,
191 MISC,
192 MONITOR,
193 GROW,
194 INCREMENTAL,
195 AUTODETECT,
196};
197
198extern char short_options[];
199extern char short_bitmap_options[];
200extern char short_bitmap_auto_options[];
201extern struct option long_options[];
202extern char Version[], Usage[], Help[], OptionHelp[],
203 Help_create[], Help_build[], Help_assemble[], Help_grow[],
204 Help_incr[],
205 Help_manage[], Help_misc[], Help_monitor[], Help_config[];
206
207/* for option that don't have short equivilents, we assign arbitrary
208 * small numbers. '1' means an undecorated option, so we start at '2'.
209 */
210enum special_options {
211 AssumeClean = 2,
212 BitmapChunk,
213 WriteBehind,
214 ReAdd,
215 NoDegraded,
216 Sparc22,
217 BackupFile,
218 HomeHost,
219 AutoHomeHost,
220 Symlinks,
221 AutoDetect,
222};
223
224/* structures read from config file */
225/* List of mddevice names and identifiers
226 * Identifiers can be:
227 * uuid=128-hex-uuid
228 * super-minor=decimal-minor-number-from-superblock
229 * devices=comma,separated,list,of,device,names,with,wildcards
230 *
231 * If multiple fields are present, the intersection of all matching
232 * devices is considered
233 */
234#define UnSet (0xfffe)
235typedef struct mddev_ident_s {
236 char *devname;
237
238 int uuid_set;
239 int uuid[4];
240 char name[33];
241
242 unsigned int super_minor;
243
244 char *devices; /* comma separated list of device
245 * names with wild cards
246 */
247 int level;
248 unsigned int raid_disks;
249 unsigned int spare_disks;
250 struct supertype *st;
251 int autof; /* 1 for normal, 2 for partitioned */
252 char *spare_group;
253 char *bitmap_file;
254 int bitmap_fd;
255
256 struct mddev_ident_s *next;
257} *mddev_ident_t;
258
259/* List of device names - wildcards expanded */
260typedef struct mddev_dev_s {
261 char *devname;
262 char disposition; /* 'a' for add, 'r' for remove, 'f' for fail.
263 * Not set for names read from .config
264 */
265 char writemostly;
266 char re_add;
267 char used; /* set when used */
268 struct mddev_dev_s *next;
269} *mddev_dev_t;
270
271typedef struct mapping {
272 char *name;
273 int num;
274} mapping_t;
275
276
277struct mdstat_ent {
278 char *dev;
279 int devnum;
280 int active;
281 char *level;
282 char *pattern; /* U or up, _ for down */
283 int percent; /* -1 if no resync */
284 int resync; /* 1 if resync, 0 if recovery */
285 int devcnt;
286 int raid_disks;
287 int chunk_size;
288 char * metadata_version;
289 struct mdstat_ent *next;
290};
291
292extern struct mdstat_ent *mdstat_read(int hold, int start);
293extern void free_mdstat(struct mdstat_ent *ms);
294extern void mdstat_wait(int seconds);
295extern void mdstat_wait_fd(int fd, const sigset_t *sigmask);
296extern int mddev_busy(int devnum);
297
298struct map_ent {
299 struct map_ent *next;
300 int devnum;
301 int major,minor;
302 int uuid[4];
303 char *path;
304};
305extern int map_update(struct map_ent **mpp, int devnum, int major, int minor,
306 int uuid[4], char *path);
307extern struct map_ent *map_by_uuid(struct map_ent **map, int uuid[4]);
308extern void map_read(struct map_ent **melp);
309extern int map_write(struct map_ent *mel);
310extern void map_delete(struct map_ent **mapp, int devnum);
311extern void map_free(struct map_ent *map);
312extern void map_add(struct map_ent **melp,
313 int devnum, int major, int minor, int uuid[4], char *path);
314
315/* various details can be requested */
316#define GET_LEVEL 1
317#define GET_LAYOUT 2
318#define GET_COMPONENT 4
319#define GET_CHUNK 8
320#define GET_CACHE 16
321#define GET_MISMATCH 32
322#define GET_VERSION 64
323#define GET_DISKS 128
324
325#define GET_DEVS 1024 /* gets role, major, minor */
326#define GET_OFFSET 2048
327#define GET_SIZE 4096
328#define GET_STATE 8192
329#define GET_ERROR 16384
330
331/* If fd >= 0, get the array it is open on,
332 * else use devnum. >=0 -> major9. <0.....
333 */
334extern int sysfs_open(int devnum, char *devname, char *attr);
335extern void sysfs_free(struct mdinfo *sra);
336extern struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options);
337extern int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev,
338 char *name, char *val);
339extern int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev,
340 char *name, unsigned long long val);
341extern int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev,
342 char *name, unsigned long long *val);
343extern int sysfs_set_array(struct mdinfo *sra,
344 struct mdinfo *info);
345extern int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd);
346
347
348
349
350extern int save_stripes(int *source, unsigned long long *offsets,
351 int raid_disks, int chunk_size, int level, int layout,
352 int nwrites, int *dest,
353 unsigned long long start, unsigned long long length);
354extern int restore_stripes(int *dest, unsigned long long *offsets,
355 int raid_disks, int chunk_size, int level, int layout,
356 int source, unsigned long long read_offset,
357 unsigned long long start, unsigned long long length);
358
359#ifndef Sendmail
360#define Sendmail "/usr/lib/sendmail -t"
361#endif
362
363#define SYSLOG_FACILITY LOG_DAEMON
364
365extern char *map_num(mapping_t *map, int num);
366extern int map_name(mapping_t *map, char *name);
367extern mapping_t r5layout[], pers[], modes[], faultylayout[];
368
369extern char *map_dev(int major, int minor, int create);
370
371struct active_array;
372
373extern struct superswitch {
374 void (*examine_super)(struct supertype *st, char *homehost);
375 void (*brief_examine_super)(struct supertype *st);
376 void (*export_examine_super)(struct supertype *st);
377 void (*detail_super)(struct supertype *st, char *homehost);
378 void (*brief_detail_super)(struct supertype *st);
379 void (*export_detail_super)(struct supertype *st);
380 void (*uuid_from_super)(struct supertype *st, int uuid[4]);
381 void (*getinfo_super)(struct supertype *st, struct mdinfo *info);
382 void (*getinfo_super_n)(struct supertype *st, struct mdinfo *info);
383 int (*match_home)(struct supertype *st, char *homehost);
384 int (*update_super)(struct supertype *st, struct mdinfo *info,
385 char *update,
386 char *devname, int verbose,
387 int uuid_set, char *homehost);
388 int (*init_super)(struct supertype *st, mdu_array_info_t *info,
389 unsigned long long size, char *name,
390 char *homehost, int *uuid);
391 void (*add_to_super)(struct supertype *st, mdu_disk_info_t *dinfo,
392 int fd, char *devname);
393 int (*store_super)(struct supertype *st, int fd);
394 int (*write_init_super)(struct supertype *st);
395 int (*compare_super)(struct supertype *st, struct supertype *tst);
396 int (*load_super)(struct supertype *st, int fd, char *devname);
397 struct supertype * (*match_metadata_desc)(char *arg);
398 __u64 (*avail_size)(struct supertype *st, __u64 size);
399 int (*add_internal_bitmap)(struct supertype *st, int *chunkp,
400 int delay, int write_behind,
401 unsigned long long size, int may_change, int major);
402 void (*locate_bitmap)(struct supertype *st, int fd);
403 int (*write_bitmap)(struct supertype *st, int fd);
404 void (*free_super)(struct supertype *st);
405 int (*validate_geometry)(struct supertype *st, int level, int layout,
406 int raiddisks,
407 int chunk, unsigned long long size,
408 char *subdev, unsigned long long *freesize);
409
410 struct mdinfo *(*container_content)(struct supertype *st);
411
412/* for mdmon */
413 int (*open_new)(struct supertype *c, struct active_array *a, int inst);
414 /* This tells the metadata handler that all data up to sync_pos is
415 * known to be insync, and will stay insync until told otherwise.
416 * All data beyond sync_pos may not be insync.
417 * If sync_pos == 0, this marks the array as 'dirty'.
418 * If sync_pos == ~0, this marks it as fully 'clean'.
419 * If other numbers cannot be stored, they should be treated as 0.
420 * mark_clean is always called with a sync_pos of 0 before any
421 * write to an array with redundancy is allowed.
422 */
423 void (*mark_clean)(struct active_array *a, unsigned long long sync_pos);
424
425 /* When the state of a device might have changed, we call set_disk to
426 * tell the metadata what the current state is.
427 * Typically this happens on spare->in_sync and (spare|in_sync)->faulty
428 * transitions.
429 * set_disk might be called when the state of the particular disk has
430 * not in fact changed.
431 */
432 void (*set_disk)(struct active_array *a, int n, int state);
433 void (*sync_metadata)(struct active_array *a);
434
435
436 int major;
437 char *text_version;
438 int swapuuid; /* true if uuid is bigending rather than hostendian */
439 int external;
440} super0, super1, super_ddf, super_ddf_bvd, super_ddf_svd, *superlist[];
441
442extern struct superswitch super_imsm, super_imsm_raid;
443
444struct supertype {
445 struct superswitch *ss;
446 int minor_version;
447 int max_devs;
448 int container_dev; /* devnum of container */
449 int container_member; /* numerical position in container */
450 void *sb;
451 void *info;
452
453 /* extra stuff used by mdmon */
454 struct active_array *arrays;
455 int sock; /* listen to external programs */
456 int mgr_pipe[2]; /* communicate between threads */
457 int mon_pipe[2]; /* communicate between threads */
458 int devnum;
459 char *devname; /* e.g. md0. This appears in metadata_verison:
460 * external:/md0/12
461 */
462 int devcnt;
463 char *device_name; /* e.g. /dev/md/whatever */
464
465 struct mdinfo *devs;
466
467};
468
469extern struct supertype supertype_container_member;
470extern struct supertype *super_by_fd(int fd);
471extern struct supertype *guess_super(int fd);
472extern struct supertype *dup_super(struct supertype *st);
473extern int get_dev_size(int fd, char *dname, unsigned long long *sizep);
474extern void get_one_disk(int mdfd, mdu_array_info_t *ainf,
475 mdu_disk_info_t *disk);
476
477#if __GNUC__ < 3
478struct stat64;
479#endif
480
481#define HAVE_NFTW we assume
482#define HAVE_FTW
483
484#ifdef UCLIBC
485# include <features.h>
486# ifndef __UCLIBC_HAS_FTW__
487# undef HAVE_FTW
488# undef HAVE_NFTW
489# endif
490#endif
491
492#ifdef __dietlibc__
493# undef HAVE_NFTW
494#endif
495
496#if defined(__KLIBC__)
497# undef HAVE_NFTW
498# undef HAVE_FTW
499#endif
500
501#ifndef HAVE_NFTW
502# define FTW_PHYS 1
503# ifndef HAVE_FTW
504 struct FTW {};
505# endif
506#endif
507
508#ifdef HAVE_FTW
509# include <ftw.h>
510#endif
511
512extern int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s);
513
514
515extern int Manage_ro(char *devname, int fd, int readonly);
516extern int Manage_runstop(char *devname, int fd, int runstop, int quiet);
517extern int Manage_resize(char *devname, int fd, long long size, int raid_disks);
518extern int Manage_reconfig(char *devname, int fd, int layout);
519extern int Manage_subdevs(char *devname, int fd,
520 mddev_dev_t devlist, int verbose);
521extern int autodetect(void);
522extern int Grow_Add_device(char *devname, int fd, char *newdev);
523extern int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int write_behind, int force);
524extern int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
525 long long size,
526 int level, int layout, int chunksize, int raid_disks);
527extern int Grow_restart(struct supertype *st, struct mdinfo *info,
528 int *fdlist, int cnt, char *backup_file);
529
530
531extern int Assemble(struct supertype *st, char *mddev, int mdfd,
532 mddev_ident_t ident,
533 mddev_dev_t devlist, char *backup_file,
534 int readonly, int runstop,
535 char *update, char *homehost,
536 int verbose, int force);
537
538extern int Build(char *mddev, int mdfd, int chunk, int level, int layout,
539 int raiddisks,
540 mddev_dev_t devlist, int assume_clean,
541 char *bitmap_file, int bitmap_chunk, int write_behind, int delay, int verbose);
542
543
544extern int Create(struct supertype *st, char *mddev, int mdfd,
545 int chunk, int level, int layout, unsigned long long size, int raiddisks, int sparedisks,
546 char *name, char *homehost, int *uuid,
547 int subdevs, mddev_dev_t devlist,
548 int runstop, int verbose, int force, int assume_clean,
549 char *bitmap_file, int bitmap_chunk, int write_behind, int delay);
550
551extern int Detail(char *dev, int brief, int export, int test, char *homehost);
552extern int Query(char *dev);
553extern int Examine(mddev_dev_t devlist, int brief, int export, int scan,
554 int SparcAdjust, struct supertype *forcest, char *homehost);
555extern int Monitor(mddev_dev_t devlist,
556 char *mailaddr, char *alert_cmd,
557 int period, int daemonise, int scan, int oneshot,
558 int dosyslog, int test, char *pidfile);
559
560extern int Kill(char *dev, int force, int quiet, int noexcl);
561extern int Wait(char *dev);
562
563extern int Incremental(char *devname, int verbose, int runstop,
564 struct supertype *st, char *homehost, int autof);
565extern int Incremental_container(struct supertype *st, char *devname,
566 int verbose, int runstop, int autof);
567extern void RebuildMap(void);
568extern int IncrementalScan(int verbose);
569
570extern int CreateBitmap(char *filename, int force, char uuid[16],
571 unsigned long chunksize, unsigned long daemon_sleep,
572 unsigned long write_behind,
573 unsigned long long array_size,
574 int major);
575extern int ExamineBitmap(char *filename, int brief, struct supertype *st);
576extern int bitmap_update_uuid(int fd, int *uuid, int swap);
577
578extern int md_get_version(int fd);
579extern int get_linux_version(void);
580extern int parse_uuid(char *str, int uuid[4]);
581extern int check_ext2(int fd, char *name);
582extern int check_reiser(int fd, char *name);
583extern int check_raid(int fd, char *name);
584
585extern int get_mdp_major(void);
586extern int dev_open(char *dev, int flags);
587extern int is_standard(char *dev, int *nump);
588
589extern int parse_auto(char *str, char *msg, int config);
590extern mddev_ident_t conf_get_ident(char *dev);
591extern mddev_dev_t conf_get_devs(void);
592extern int conf_test_dev(char *devname);
593extern struct createinfo *conf_get_create_info(void);
594extern void set_conffile(char *file);
595extern char *conf_get_mailaddr(void);
596extern char *conf_get_mailfrom(void);
597extern char *conf_get_program(void);
598extern char *conf_get_homehost(void);
599extern char *conf_line(FILE *file);
600extern char *conf_word(FILE *file, int allow_key);
601extern void free_line(char *line);
602extern int match_oneof(char *devices, char *devname);
603extern void uuid_from_super(int uuid[4], mdp_super_t *super);
604extern int same_uuid(int a[4], int b[4], int swapuuid);
605extern void copy_uuid(void *a, int b[4], int swapuuid);
606extern unsigned long calc_csum(void *super, int bytes);
607extern int enough(int level, int raid_disks, int layout, int clean,
608 char *avail, int avail_disks);
609extern int ask(char *mesg);
610extern unsigned long long get_component_size(int fd);
611extern void remove_partitions(int fd);
612extern unsigned long long calc_array_size(int level, int raid_disks, int layout,
613 int chunksize, unsigned long long devsize);
614
615
616extern char *human_size(long long bytes);
617char *human_size_brief(long long bytes);
618
619#define NoMdDev (1<<23)
620extern int find_free_devnum(int use_partitions);
621
622extern void put_md_name(char *name);
623extern char *get_md_name(int dev);
624
625extern char DefaultConfFile[];
626
627extern int open_mddev(char *dev, int autof);
628extern int open_mddev_devnum(char *devname, int devnum, char *name,
629 char *chosen_name, int parts);
630extern int open_container(int fd);
631
632extern char *devnum2devname(int num);
633extern int fd2devnum(int fd);
634
635#define LEVEL_MULTIPATH (-4)
636#define LEVEL_LINEAR (-1)
637#define LEVEL_FAULTY (-5)
638
639/* kernel module doesn't know about these */
640#define LEVEL_CONTAINER (-100)
641#define LEVEL_UNSUPPORTED (-200)
642
643
644/* faulty stuff */
645
646#define WriteTransient 0
647#define ReadTransient 1
648#define WritePersistent 2
649#define ReadPersistent 3
650#define WriteAll 4 /* doesn't go to device */
651#define ReadFixable 5
652#define Modes 6
653
654#define ClearErrors 31
655#define ClearFaults 30
656
657#define AllPersist 100 /* internal use only */
658#define NoPersist 101
659
660#define ModeMask 0x1f
661#define ModeShift 5
662
663
664#ifdef __TINYC__
665#undef minor
666#undef major
667#undef makedev
668#define minor(x) ((x)&0xff)
669#define major(x) (((x)>>8)&0xff)
670#define makedev(M,m) (((M)<<8) | (m))
671#endif
672
673/* for raid5 */
674#define ALGORITHM_LEFT_ASYMMETRIC 0
675#define ALGORITHM_RIGHT_ASYMMETRIC 1
676#define ALGORITHM_LEFT_SYMMETRIC 2
677#define ALGORITHM_RIGHT_SYMMETRIC 3
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