X-Git-Url: http://git.ipfire.org/?p=thirdparty%2Fmdadm.git;a=blobdiff_plain;f=mdadm.h;h=08e454404bccb3494bc8789d1f9d3f97c42c767a;hp=eef9dee54cb91cdd11884f58a89cb6b670e07387;hb=0592faeb5e693d4317fb85d5ab013697a21c301d;hpb=4cce4069597491f5714fd81605f212ad2da62e06 diff --git a/mdadm.h b/mdadm.h index eef9dee5..08e45440 100644 --- a/mdadm.h +++ b/mdadm.h @@ -1,7 +1,7 @@ /* * mdadm - manage Linux "md" devices aka RAID arrays. * - * Copyright (C) 2001-2006 Neil Brown + * Copyright (C) 2001-2009 Neil Brown * * * This program is free software; you can redistribute it and/or modify @@ -19,12 +19,7 @@ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * Author: Neil Brown - * Email: - * Paper: Neil Brown - * School of Computer Science and Engineering - * The University of New South Wales - * Sydney, 2052 - * Australia + * Email: */ #define _GNU_SOURCE @@ -73,6 +68,31 @@ extern __off64_t lseek64 __P ((int __fd, __off64_t __offset, int __whence)); #define DEFAULT_BITMAP_DELAY 5 #define DEFAULT_MAX_WRITE_BEHIND 256 +/* MAP_DIR should be somewhere that persists across the pivotroot + * from early boot to late boot. + * Currently /dev seems to be the only option on most distros. + */ +#ifndef MAP_DIR +#define MAP_DIR "/dev/.mdadm" +#endif /* MAP_DIR */ +/* MAP_FILE is what we name the map file we put in MAP_DIR, in case you + * want something other than the default of "map" + */ +#ifndef MAP_FILE +#define MAP_FILE "map" +#endif /* MAP_FILE */ +/* MDMON_DIR is where pid and socket files used for communicating + * with mdmon normally live. It *should* be /var/run, but when + * mdmon is needed at early boot then it needs to write there prior + * to /var/run being mounted read/write, and it also then needs to + * persist beyond when /var/run is mounter read-only. So, to be + * safe, the default is somewhere that is read/write early in the + * boot process and stays up as long as possible during shutdown. + */ +#ifndef MDMON_DIR +#define MDMON_DIR "/dev/.mdadm/" +#endif /* MDMON_DIR */ + #include "md_u.h" #include "md_p.h" #include "bitmap.h" @@ -134,6 +154,22 @@ extern __off64_t lseek64 __P ((int __fd, __off64_t __offset, int __whence)); #endif /* __KLIBC__ */ +/* + * min()/max()/clamp() macros that also do + * strict type-checking.. See the + * "unnecessary" pointer comparison. + */ +#define min(x, y) ({ \ + typeof(x) _min1 = (x); \ + typeof(y) _min2 = (y); \ + (void) (&_min1 == &_min2); \ + _min1 < _min2 ? _min1 : _min2; }) + +#define max(x, y) ({ \ + typeof(x) _max1 = (x); \ + typeof(y) _max2 = (y); \ + (void) (&_max1 == &_max2); \ + _max1 > _max2 ? _max1 : _max2; }) /* general information that might be extracted from a superblock */ struct mdinfo { @@ -146,25 +182,40 @@ struct mdinfo { unsigned long long component_size; /* same as array.size, except in * sectors and up to 64bits. */ + unsigned long long custom_array_size; /* size for non-default sized + * arrays (in sectors) + */ int reshape_active; unsigned long long reshape_progress; - unsigned long long resync_start; + union { + unsigned long long resync_start; /* per-array resync position */ + unsigned long long recovery_start; /* per-device rebuild position */ + #define MaxSector (~0ULL) /* resync/recovery complete position */ + }; unsigned long safe_mode_delay; /* ms delay to mark clean */ int new_level, delta_disks, new_layout, new_chunk; int errors; - int cache_size; /* size of raid456 stripe cache*/ + unsigned long cache_size; /* size of raid456 stripe cache*/ int mismatch_cnt; char text_version[50]; + void *update_private; /* for passing metadata-format + * specific update data + * between successive calls to + * update_super() + */ int container_member; /* for assembling external-metatdata arrays * This is to be used internally by metadata * handler only */ - + int container_enough; /* flag external handlers can set to + * indicate that subarrays have not enough (-1), + * enough to start (0), or all expected disks (1) */ char sys_name[20]; struct mdinfo *devs; struct mdinfo *next; /* Device info for mdmon: */ + int recovery_fd; int state_fd; #define DS_FAULTY 1 #define DS_INSYNC 2 @@ -211,6 +262,7 @@ extern char Version[], Usage[], Help[], OptionHelp[], /* for option that don't have short equivilents, we assign arbitrary * small numbers. '1' means an undecorated option, so we start at '2'. + * (note we must stop before we get to 65 i.e. 'A') */ enum special_options { AssumeClean = 2, @@ -219,13 +271,15 @@ enum special_options { ReAdd, NoDegraded, Sparc22, - BackupFile, + BackupFile, /* 8 */ HomeHost, AutoHomeHost, Symlinks, AutoDetect, Waitclean, DetailPlatform, + KillSubarray, + UpdateSubarray, /* 16 */ }; /* structures read from config file */ @@ -246,14 +300,14 @@ typedef struct mddev_ident_s { int uuid[4]; char name[33]; - unsigned int super_minor; + int super_minor; char *devices; /* comma separated list of device * names with wild cards */ int level; - unsigned int raid_disks; - unsigned int spare_disks; + int raid_disks; + int spare_disks; struct supertype *st; int autof; /* 1 for normal, 2 for partitioned */ char *spare_group; @@ -268,6 +322,10 @@ typedef struct mddev_ident_s { char *member; /* subarray within a container */ struct mddev_ident_s *next; + union { + /* fields needed by different users of this structure */ + int assembled; /* set when assembly succeeds */ + }; } *mddev_ident_t; /* List of device names - wildcards expanded */ @@ -302,6 +360,10 @@ struct mdstat_ent { int raid_disks; int chunk_size; char * metadata_version; + struct dev_member { + char *name; + struct dev_member *next; + } *members; struct mdstat_ent *next; }; @@ -310,6 +372,7 @@ extern void free_mdstat(struct mdstat_ent *ms); extern void mdstat_wait(int seconds); extern void mdstat_wait_fd(int fd, const sigset_t *sigmask); extern int mddev_busy(int devnum); +extern struct mdstat_ent *mdstat_by_component(char *name); struct map_ent { struct map_ent *next; @@ -321,6 +384,7 @@ struct map_ent { }; extern int map_update(struct map_ent **mpp, int devnum, char *metadata, int uuid[4], char *path); +extern void map_remove(struct map_ent **map, int devnum); extern struct map_ent *map_by_uuid(struct map_ent **map, int uuid[4]); extern struct map_ent *map_by_devnum(struct map_ent **map, int devnum); extern struct map_ent *map_by_name(struct map_ent **map, char *name); @@ -334,22 +398,23 @@ extern int map_lock(struct map_ent **melp); extern void map_unlock(struct map_ent **melp); /* various details can be requested */ -#define GET_LEVEL 1 -#define GET_LAYOUT 2 -#define GET_COMPONENT 4 -#define GET_CHUNK 8 -#define GET_CACHE 16 -#define GET_MISMATCH 32 -#define GET_VERSION 64 -#define GET_DISKS 128 -#define GET_DEGRADED 256 -#define GET_SAFEMODE 512 - -#define GET_DEVS 1024 /* gets role, major, minor */ -#define GET_OFFSET 2048 -#define GET_SIZE 4096 -#define GET_STATE 8192 -#define GET_ERROR 16384 +enum sysfs_read_flags { + GET_LEVEL = (1 << 0), + GET_LAYOUT = (1 << 1), + GET_COMPONENT = (1 << 2), + GET_CHUNK = (1 << 3), + GET_CACHE = (1 << 4), + GET_MISMATCH = (1 << 5), + GET_VERSION = (1 << 6), + GET_DISKS = (1 << 7), + GET_DEGRADED = (1 << 8), + GET_SAFEMODE = (1 << 9), + GET_DEVS = (1 << 10), /* gets role, major, minor */ + GET_OFFSET = (1 << 11), + GET_SIZE = (1 << 12), + GET_STATE = (1 << 13), + GET_ERROR = (1 << 14), +}; /* If fd >= 0, get the array it is open on, * else use devnum. >=0 -> major9. <0..... @@ -365,11 +430,17 @@ extern int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev, extern int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev, char *name, unsigned long long val); extern int sysfs_uevent(struct mdinfo *sra, char *event); +extern int sysfs_get_fd(struct mdinfo *sra, struct mdinfo *dev, + char *name); +extern int sysfs_fd_get_ll(int fd, unsigned long long *val); extern int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev, char *name, unsigned long long *val); +extern int sysfs_fd_get_str(int fd, char *val, int size); +extern int sysfs_get_str(struct mdinfo *sra, struct mdinfo *dev, + char *name, char *val, int size); extern int sysfs_set_safemode(struct mdinfo *sra, unsigned long ms); extern int sysfs_set_array(struct mdinfo *info, int vers); -extern int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd); +extern int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd, int resume); extern int sysfs_disk_to_scsi_id(int fd, __u32 *id); extern int sysfs_unique_holder(int devnum, long rdev); extern int load_sys(char *path, char *buf); @@ -378,7 +449,8 @@ extern int load_sys(char *path, char *buf); extern int save_stripes(int *source, unsigned long long *offsets, int raid_disks, int chunk_size, int level, int layout, int nwrites, int *dest, - unsigned long long start, unsigned long long length); + unsigned long long start, unsigned long long length, + char *buf); extern int restore_stripes(int *dest, unsigned long long *offsets, int raid_disks, int chunk_size, int level, int layout, int source, unsigned long long read_offset, @@ -392,7 +464,7 @@ extern int restore_stripes(int *dest, unsigned long long *offsets, extern char *map_num(mapping_t *map, int num); extern int map_name(mapping_t *map, char *name); -extern mapping_t r5layout[], pers[], modes[], faultylayout[]; +extern mapping_t r5layout[], r6layout[], pers[], modes[], faultylayout[]; extern char *map_dev(int major, int minor, int create); @@ -432,7 +504,8 @@ extern struct superswitch { * device. ->load_super has been called. */ void (*examine_super)(struct supertype *st, char *homehost); - void (*brief_examine_super)(struct supertype *st); + void (*brief_examine_super)(struct supertype *st, int verbose); + void (*brief_examine_subarrays)(struct supertype *st, int verbose); void (*export_examine_super)(struct supertype *st); /* Used to report details of an active array. @@ -443,7 +516,7 @@ extern struct superswitch { void (*export_detail_super)(struct supertype *st); /* Optional: platform hardware / firmware details */ - int (*detail_platform)(int verbose); + int (*detail_platform)(int verbose, int enumerate_only); /* Used: * to get uuid to storing in bitmap metadata @@ -452,7 +525,7 @@ extern struct superswitch { */ void (*uuid_from_super)(struct supertype *st, int uuid[4]); - /* Extra generic details from metadata. This could be details about + /* Extract generic details from metadata. This could be details about * the container, or about an individual array within the container. * The determination is made either by: * load_super being given a 'component' string. @@ -536,6 +609,7 @@ extern struct superswitch { * added to validate changing size and new devices. If there are * inter-device dependencies, it should record sufficient details * so these can be validated. + * Both 'size' and '*freesize' are in sectors. chunk is bytes. */ int (*validate_geometry)(struct supertype *st, int level, int layout, int raiddisks, @@ -544,6 +618,14 @@ extern struct superswitch { int verbose); struct mdinfo *(*container_content)(struct supertype *st); + /* Allow a metadata handler to override mdadm's default layouts */ + int (*default_layout)(int level); /* optional */ + /* query the supertype for default chunk size */ + int (*default_chunk)(struct supertype *st); /* optional */ + /* Permit subarray's to be deleted from inactive containers */ + int (*kill_subarray)(struct supertype *st); /* optional */ + /* Permit subarray's to be modified */ + int (*update_subarray)(struct supertype *st, char *update, mddev_ident_t ident); /* optional */ /* for mdmon */ int (*open_new)(struct supertype *c, struct active_array *a, @@ -589,9 +671,11 @@ extern struct superswitch { int swapuuid; /* true if uuid is bigending rather than hostendian */ int external; const char *name; /* canonical metadata name */ -} super0, super1, super_ddf, *superlist[]; +} *superlist[]; -extern struct superswitch super_imsm; +extern struct superswitch super0, super1; +extern struct superswitch super_imsm, super_ddf; +extern struct superswitch mbr, gpt; struct metadata_update { int len; @@ -650,7 +734,92 @@ extern struct supertype *dup_super(struct supertype *st); extern int get_dev_size(int fd, char *dname, unsigned long long *sizep); extern void get_one_disk(int mdfd, mdu_array_info_t *ainf, mdu_disk_info_t *disk); -void wait_for(char *dev); +void wait_for(char *dev, int fd); + +/* + * Data structures for policy management. + * Each device can have a policy structure that lists + * various name/value pairs each possibly with a metadata associated. + * The policy list is sorted by name/value/metadata + */ +struct dev_policy { + struct dev_policy *next; + char *name; /* None of these strings are allocated. They are + * all just references to strings which are known + * to exist elsewhere. + * name and metadata can be compared by address equality. + */ + const char *metadata; + char *value; +}; + +extern char pol_act[], pol_domain[], pol_metadata[]; + +/* iterate over the sublist starting at list, having the same + * 'name' as 'list', and matching the given metadata (Where + * NULL matches anything + */ +#define pol_for_each(item, list, _metadata) \ + for (item = list; \ + item && item->name == list->name; \ + item = item->next) \ + if (!(!_metadata || !item->metadata || _metadata == item->metadata)) \ + ; else + +/* + * policy records read from mdadm are largely just name-value pairs. + * The names are constants, not strdupped + */ +struct pol_rule { + struct pol_rule *next; + char *type; /* rule_policy or rule_part */ + struct rule { + struct rule *next; + char *name; + char *value; + char *dups; /* duplicates of 'value' with a partNN appended */ + } *rule; +}; + +extern char rule_policy[], rule_part[]; +extern char rule_path[], rule_type[]; +extern char type_part[], type_disk[]; + +extern void policyline(char *line, char *type); +extern void policy_free(void); + +extern struct dev_policy *disk_policy(struct mdinfo *disk); +extern void dev_policy_free(struct dev_policy *p); + +extern void pol_new(struct dev_policy **pol, char *name, char *val, char *metadata); +extern struct dev_policy *pol_find(struct dev_policy *pol, char *name); + +enum policy_action { + act_default, + act_include, + act_re_add, + act_spare, + act_force_spare, + act_err +}; + +extern int policy_action_allows(struct dev_policy *plist, const char *metadata, + enum policy_action want); +extern int disk_action_allows(struct mdinfo *disk, const char *metadata, + enum policy_action want); + +struct domainlist { + struct domainlist *next; + char *dom; +}; + +extern int domain_test(struct domainlist *dom, struct dev_policy *pol, + const char *metadata); +extern struct domainlist *domain_from_array(struct mdinfo *mdi, + const char *metadata); +extern void domain_free(struct domainlist *dl); +extern void domain_merge(struct domainlist **domp, struct dev_policy *pol, + const char *metadata); #if __GNUC__ < 3 struct stat64; @@ -659,8 +828,11 @@ struct stat64; #define HAVE_NFTW we assume #define HAVE_FTW -#ifdef UCLIBC +#ifdef __UCLIBC__ # include +# ifndef __UCLIBC_HAS_LFS__ +# define lseek64 lseek +# endif # ifndef __UCLIBC_HAS_FTW__ # undef HAVE_FTW # undef HAVE_NFTW @@ -693,30 +865,30 @@ extern int add_dev(const char *name, const struct stat *stb, int flag, struct FT extern int Manage_ro(char *devname, int fd, int readonly); extern int Manage_runstop(char *devname, int fd, int runstop, int quiet); extern int Manage_resize(char *devname, int fd, long long size, int raid_disks); -extern int Manage_reconfig(char *devname, int fd, int layout); extern int Manage_subdevs(char *devname, int fd, - mddev_dev_t devlist, int verbose); + mddev_dev_t devlist, int verbose, int test); extern int autodetect(void); extern int Grow_Add_device(char *devname, int fd, char *newdev); extern int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int write_behind, int force); extern int Grow_reshape(char *devname, int fd, int quiet, char *backup_file, long long size, - int level, int layout, int chunksize, int raid_disks); + int level, char *layout_str, int chunksize, int raid_disks); extern int Grow_restart(struct supertype *st, struct mdinfo *info, - int *fdlist, int cnt, char *backup_file); - + int *fdlist, int cnt, char *backup_file, int verbose); +extern int Grow_continue(int mdfd, struct supertype *st, + struct mdinfo *info, char *backup_file); extern int Assemble(struct supertype *st, char *mddev, mddev_ident_t ident, mddev_dev_t devlist, char *backup_file, int readonly, int runstop, - char *update, char *homehost, + char *update, char *homehost, int require_homehost, int verbose, int force); extern int Build(char *mddev, int chunk, int level, int layout, int raiddisks, mddev_dev_t devlist, int assume_clean, char *bitmap_file, int bitmap_chunk, int write_behind, - int delay, int verbose, int autof); + int delay, int verbose, int autof, unsigned long long size); extern int Create(struct supertype *st, char *mddev, @@ -734,20 +906,23 @@ extern int Examine(mddev_dev_t devlist, int brief, int export, int scan, extern int Monitor(mddev_dev_t devlist, char *mailaddr, char *alert_cmd, int period, int daemonise, int scan, int oneshot, - int dosyslog, int test, char *pidfile); + int dosyslog, int test, char *pidfile, int increments); -extern int Kill(char *dev, int force, int quiet, int noexcl); +extern int Kill(char *dev, struct supertype *st, int force, int quiet, int noexcl); +extern int Kill_subarray(char *dev, char *subarray, int quiet); +extern int Update_subarray(char *dev, char *subarray, char *update, mddev_ident_t ident, int quiet); extern int Wait(char *dev); -extern int WaitClean(char *dev, int verbose); +extern int WaitClean(char *dev, int sock, int verbose); extern int Incremental(char *devname, int verbose, int runstop, - struct supertype *st, char *homehost, int autof); + struct supertype *st, char *homehost, int require_homehost, + int autof); extern int Incremental_container(struct supertype *st, char *devname, int verbose, int runstop, int autof, int trustworthy); extern void RebuildMap(void); extern int IncrementalScan(int verbose); - +extern int IncrementalRemove(char *devname, int verbose); extern int CreateBitmap(char *filename, int force, char uuid[16], unsigned long chunksize, unsigned long daemon_sleep, unsigned long write_behind, @@ -759,10 +934,14 @@ extern unsigned long bitmap_sectors(struct bitmap_super_s *bsb); extern int md_get_version(int fd); extern int get_linux_version(void); +extern long long parse_size(char *size); extern int parse_uuid(char *str, int uuid[4]); +extern int parse_layout_10(char *layout); +extern int parse_layout_faulty(char *layout); extern int check_ext2(int fd, char *name); extern int check_reiser(int fd, char *name); extern int check_raid(int fd, char *name); +extern int check_partitions(int fd, char *dname, unsigned long long freesize); extern int get_mdp_major(void); extern int dev_open(char *dev, int flags); @@ -775,20 +954,26 @@ extern int parse_auto(char *str, char *msg, int config); extern mddev_ident_t conf_get_ident(char *dev); extern mddev_dev_t conf_get_devs(void); extern int conf_test_dev(char *devname); +extern int conf_test_metadata(const char *version, int is_homehost); extern struct createinfo *conf_get_create_info(void); extern void set_conffile(char *file); extern char *conf_get_mailaddr(void); extern char *conf_get_mailfrom(void); extern char *conf_get_program(void); -extern char *conf_get_homehost(void); +extern char *conf_get_homehost(int *require_homehostp); extern char *conf_line(FILE *file); extern char *conf_word(FILE *file, int allow_key); +extern int conf_name_is_free(char *name); +extern int devname_matches(char *name, char *match); +extern struct mddev_ident_s *conf_match(struct mdinfo *info, struct supertype *st); + extern void free_line(char *line); extern int match_oneof(char *devices, char *devname); extern void uuid_from_super(int uuid[4], mdp_super_t *super); extern const int uuid_match_any[4]; extern int same_uuid(int a[4], int b[4], int swapuuid); extern void copy_uuid(void *a, int b[4], int swapuuid); +extern char *__fname_from_uuid(int id[4], int swap, char *buf, char sep); extern char *fname_from_uuid(struct supertype *st, struct mdinfo *info, char *buf, char sep); extern unsigned long calc_csum(void *super, int bytes); @@ -797,6 +982,7 @@ extern int enough(int level, int raid_disks, int layout, int clean, extern int ask(char *mesg); extern unsigned long long get_component_size(int fd); extern void remove_partitions(int fd); +extern int test_partition(int fd); extern unsigned long long calc_array_size(int level, int raid_disks, int layout, int chunksize, unsigned long long devsize); extern int flush_metadata_updates(struct supertype *st); @@ -808,6 +994,7 @@ extern int assemble_container_content(struct supertype *st, int mdfd, extern int add_disk(int mdfd, struct supertype *st, struct mdinfo *sra, struct mdinfo *info); extern int set_array_info(int mdfd, struct supertype *st, struct mdinfo *info); +unsigned long long min_recovery_start(struct mdinfo *array); extern char *human_size(long long bytes); extern char *human_size_brief(long long bytes); @@ -825,14 +1012,21 @@ extern int create_mddev(char *dev, char *name, int autof, int trustworthy, char *chosen); /* values for 'trustworthy' */ #define LOCAL 1 +#define LOCAL_ANY 10 #define FOREIGN 2 #define METADATA 3 extern int open_mddev(char *dev, int report_errors); extern int open_container(int fd); +extern int is_container_member(struct mdstat_ent *ent, char *devname); +extern int is_subarray_active(char *subarray, char *devname); +int is_container_active(char *devname); +extern int open_subarray(char *dev, struct supertype *st, int quiet); +extern struct superswitch *version_to_superswitch(char *vers); extern int mdmon_running(int devnum); -extern int signal_mdmon(int devnum); +extern int mdmon_pid(int devnum); extern int check_env(char *name); +extern __u32 random32(void); extern int start_mdmon(int devnum); extern char *devnum2devname(int num); @@ -879,6 +1073,17 @@ static inline int is_subarray(char *vers) #define dprintf(fmt, arg...) \ ({ if (0) fprintf(stderr, fmt, ##arg); 0; }) #endif +#include +#include +static inline int xasprintf(char **strp, const char *fmt, ...) { + va_list ap; + int ret; + va_start(ap, fmt); + ret = vasprintf(strp, fmt, ap); + va_end(ap); + assert(ret >= 0); + return ret; +} #define LEVEL_MULTIPATH (-4) #define LEVEL_LINEAR (-1) @@ -918,8 +1123,51 @@ static inline int is_subarray(char *vers) #define makedev(M,m) (((M)<<8) | (m)) #endif -/* for raid5 */ +/* for raid4/5/6 */ #define ALGORITHM_LEFT_ASYMMETRIC 0 #define ALGORITHM_RIGHT_ASYMMETRIC 1 #define ALGORITHM_LEFT_SYMMETRIC 2 #define ALGORITHM_RIGHT_SYMMETRIC 3 + +/* Define non-rotating (raid4) algorithms. These allow + * conversion of raid4 to raid5. + */ +#define ALGORITHM_PARITY_0 4 /* P or P,Q are initial devices */ +#define ALGORITHM_PARITY_N 5 /* P or P,Q are final devices. */ + +/* DDF RAID6 layouts differ from md/raid6 layouts in two ways. + * Firstly, the exact positioning of the parity block is slightly + * different between the 'LEFT_*' modes of md and the "_N_*" modes + * of DDF. + * Secondly, or order of datablocks over which the Q syndrome is computed + * is different. + * Consequently we have different layouts for DDF/raid6 than md/raid6. + * These layouts are from the DDFv1.2 spec. + * Interestingly DDFv1.2-Errata-A does not specify N_CONTINUE but + * leaves RLQ=3 as 'Vendor Specific' + */ + +#define ALGORITHM_ROTATING_ZERO_RESTART 8 /* DDF PRL=6 RLQ=1 */ +#define ALGORITHM_ROTATING_N_RESTART 9 /* DDF PRL=6 RLQ=2 */ +#define ALGORITHM_ROTATING_N_CONTINUE 10 /*DDF PRL=6 RLQ=3 */ + + +/* For every RAID5 algorithm we define a RAID6 algorithm + * with exactly the same layout for data and parity, and + * with the Q block always on the last device (N-1). + * This allows trivial conversion from RAID5 to RAID6 + */ +#define ALGORITHM_LEFT_ASYMMETRIC_6 16 +#define ALGORITHM_RIGHT_ASYMMETRIC_6 17 +#define ALGORITHM_LEFT_SYMMETRIC_6 18 +#define ALGORITHM_RIGHT_SYMMETRIC_6 19 +#define ALGORITHM_PARITY_0_6 20 +#define ALGORITHM_PARITY_N_6 ALGORITHM_PARITY_N + +/* Define PATH_MAX in case we don't use glibc or standard library does + * not have PATH_MAX defined. Assume max path length is 4K characters. + */ +#ifndef PATH_MAX +#define PATH_MAX 4096 +#endif +