/* * mdadm - manage Linux "md" devices aka RAID arrays. * * Copyright (C) 2001-2006 Neil Brown * * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * 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 */ #define _GNU_SOURCE #include #ifndef __dietlibc__ extern __off64_t lseek64 __P ((int __fd, __off64_t __offset, int __whence)); #endif #include #include #include #include #include #include #include #include #include #include #include #ifdef __dietlibc__ #include /* dietlibc has deprecated random and srandom!! */ #define random rand #define srandom srand #endif #include /*#include */ #include #include #include #define MD_MAJOR 9 #define MdpMinorShift 6 #ifndef BLKGETSIZE64 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */ #endif #define DEFAULT_BITMAP_CHUNK 4096 #define DEFAULT_BITMAP_DELAY 5 #define DEFAULT_MAX_WRITE_BEHIND 256 #include "md_u.h" #include "md_p.h" #include "bitmap.h" #include /* Redhat don't like to #include , and * some time include isn't enough, * and there is no standard conversion function so... */ /* And dietlibc doesn't think byteswap is ok, so.. */ /* #include */ #define bswap_16(x) (((x) & 0x00ffU) << 8 | \ ((x) & 0xff00U) >> 8) #define bswap_32(x) (((x) & 0x000000ffU) << 24 | \ ((x) & 0xff000000U) >> 24 | \ ((x) & 0x0000ff00U) << 8 | \ ((x) & 0x00ff0000U) >> 8) #define bswap_64(x) (((x) & 0x00000000000000ffULL) << 56 | \ ((x) & 0xff00000000000000ULL) >> 56 | \ ((x) & 0x000000000000ff00ULL) << 40 | \ ((x) & 0x00ff000000000000ULL) >> 40 | \ ((x) & 0x0000000000ff0000ULL) << 24 | \ ((x) & 0x0000ff0000000000ULL) >> 24 | \ ((x) & 0x00000000ff000000ULL) << 8 | \ ((x) & 0x000000ff00000000ULL) >> 8) #if BYTE_ORDER == LITTLE_ENDIAN #define __cpu_to_le16(_x) (_x) #define __cpu_to_le32(_x) (_x) #define __cpu_to_le64(_x) (_x) #define __le16_to_cpu(_x) (_x) #define __le32_to_cpu(_x) (_x) #define __le64_to_cpu(_x) (_x) #elif BYTE_ORDER == BIG_ENDIAN #define __cpu_to_le16(_x) bswap_16(_x) #define __cpu_to_le32(_x) bswap_32(_x) #define __cpu_to_le64(_x) bswap_64(_x) #define __le16_to_cpu(_x) bswap_16(_x) #define __le32_to_cpu(_x) bswap_32(_x) #define __le64_to_cpu(_x) bswap_64(_x) #else # error "unknown endianness." #endif /* general information that might be extracted from a superblock */ struct mdinfo { mdu_array_info_t array; mdu_disk_info_t disk; __u64 events; int uuid[4]; char name[33]; unsigned long long data_offset; unsigned long long component_size; int reshape_active; unsigned long long reshape_progress; int new_level, delta_disks, new_layout, new_chunk; }; struct createinfo { int uid; int gid; int autof; int mode; int symlinks; struct supertype *supertype; }; #define Name "mdadm" enum mode { ASSEMBLE=1, BUILD, CREATE, MANAGE, MISC, MONITOR, GROW, }; extern char short_options[]; extern char short_bitmap_auto_options[]; extern struct option long_options[]; extern char Version[], Usage[], Help[], OptionHelp[], Help_create[], Help_build[], Help_assemble[], Help_grow[], Help_manage[], Help_misc[], Help_monitor[], Help_config[]; /* for option that don't have short equivilents, we assign arbitrary * small numbers. '1' means an undecorated option, so we start at '2'. */ enum special_options { AssumeClean = 2, BitmapChunk, WriteBehind, ReAdd, NoDegraded, Sparc22, BackupFile, HomeHost, AutoHomeHost, Symlinks, }; /* structures read from config file */ /* List of mddevice names and identifiers * Identifiers can be: * uuid=128-hex-uuid * super-minor=decimal-minor-number-from-superblock * devices=comma,separated,list,of,device,names,with,wildcards * * If multiple fields are present, the intersection of all matching * devices is considered */ #define UnSet (0xfffe) typedef struct mddev_ident_s { char *devname; int uuid_set; int uuid[4]; char name[33]; unsigned int super_minor; char *devices; /* comma separated list of device * names with wild cards */ int level; unsigned int raid_disks; unsigned int spare_disks; struct supertype *st; int autof; /* 1 for normal, 2 for partitioned */ char *spare_group; char *bitmap_file; int bitmap_fd; struct mddev_ident_s *next; } *mddev_ident_t; /* List of device names - wildcards expanded */ typedef struct mddev_dev_s { char *devname; char disposition; /* 'a' for add, 'r' for remove, 'f' for fail. * Not set for names read from .config */ char writemostly; char re_add; char used; /* set when used */ struct mddev_dev_s *next; } *mddev_dev_t; typedef struct mapping { char *name; int num; } mapping_t; struct mdstat_ent { char *dev; int devnum; int active; char *level; char *pattern; /* U or up, _ for down */ int percent; /* -1 if no resync */ int resync; /* 1 if resync, 0 if recovery */ struct mdstat_ent *next; }; extern struct mdstat_ent *mdstat_read(int hold, int start); extern void free_mdstat(struct mdstat_ent *ms); extern void mdstat_wait(int seconds); /* Data structure for holding info read from sysfs */ struct sysdev { char name[20]; int role; int major, minor; unsigned long long offset, size; int state; int errors; struct sysdev *next; }; struct sysarray { char name[20]; struct sysdev *devs; int chunk; unsigned long long component_size; int layout; int level; int spares; }; /* various details can be requested */ #define GET_LEVEL 1 #define GET_LAYOUT 2 #define GET_COMPONENT 4 #define GET_CHUNK 8 #define GET_DEVS 1024 /* gets role, major, minor */ #define GET_OFFSET 2048 #define GET_SIZE 4096 #define GET_STATE 8192 #define GET_ERROR 16384 /* If fd >= 0, get the array it is open on, * else use devnum. >=0 -> major9. <0..... */ extern struct sysarray *sysfs_read(int fd, int devnum, unsigned long options); extern int sysfs_set_str(struct sysarray *sra, struct sysdev *dev, char *name, char *val); extern int sysfs_set_num(struct sysarray *sra, struct sysdev *dev, char *name, unsigned long long val); extern int sysfs_get_ll(struct sysarray *sra, struct sysdev *dev, char *name, unsigned long long *val); 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); 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, unsigned long long start, unsigned long long length); #ifndef Sendmail #define Sendmail "/usr/lib/sendmail -t" #endif #define SYSLOG_FACILITY LOG_DAEMON 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 char *map_dev(int major, int minor, int create); extern struct superswitch { void (*examine_super)(void *sbv, char *homehost); void (*brief_examine_super)(void *sbv); void (*detail_super)(void *sbv, char *homehost); void (*brief_detail_super)(void *sbv); void (*uuid_from_super)(int uuid[4], void *sbv); void (*getinfo_super)(struct mdinfo *info, void *sbv); int (*match_home)(void *sbv, char *homehost); int (*update_super)(struct mdinfo *info, void *sbv, char *update, char *devname, int verbose, int uuid_set, char *homehost); __u64 (*event_super)(void *sbv); int (*init_super)(struct supertype *st, void **sbp, mdu_array_info_t *info, unsigned long long size, char *name, char *homehost); void (*add_to_super)(void *sbv, mdu_disk_info_t *dinfo); int (*store_super)(struct supertype *st, int fd, void *sbv); int (*write_init_super)(struct supertype *st, void *sbv, mdu_disk_info_t *dinfo, char *devname); int (*compare_super)(void **firstp, void *secondv); int (*load_super)(struct supertype *st, int fd, void **sbp, char *devname); struct supertype * (*match_metadata_desc)(char *arg); __u64 (*avail_size)(struct supertype *st, __u64 size); int (*add_internal_bitmap)(struct supertype *st, void *sbv, int chunk, int delay, int write_behind, unsigned long long size, int may_change, int major); void (*locate_bitmap)(struct supertype *st, int fd, void *sbv); int (*write_bitmap)(struct supertype *st, int fd, void *sbv); int major; int swapuuid; /* true if uuid is bigending rather than hostendian */ } super0, super1, *superlist[]; struct supertype { struct superswitch *ss; int minor_version; int max_devs; }; extern struct supertype *super_by_version(int vers, int minor); extern struct supertype *guess_super(int fd); #if __GNUC__ < 3 struct stat64; #endif #define HAVE_NFTW we assume #define HAVE_FTW #ifdef UCLIBC # include # ifndef __UCLIBC_HAS_FTW__ # undef HAVE_FTW # undef HAVE_NFTW # endif #endif #ifdef __dietlibc__ # undef HAVE_NFTW #endif #ifndef HAVE_NFTW # define FTW_PHYS 1 # ifndef HAVE_FTW struct FTW {}; # endif #endif #ifdef HAVE_FTW # include #endif extern int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s); 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); 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); extern int Grow_restart(struct supertype *st, struct mdinfo *info, int *fdlist, int cnt, char *backup_file); extern int Assemble(struct supertype *st, char *mddev, int mdfd, mddev_ident_t ident, mddev_dev_t devlist, char *backup_file, int readonly, int runstop, char *update, char *homehost, int verbose, int force); extern int Build(char *mddev, int mdfd, 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); extern int Create(struct supertype *st, char *mddev, int mdfd, int chunk, int level, int layout, unsigned long long size, int raiddisks, int sparedisks, char *name, char *homehost, int subdevs, mddev_dev_t devlist, int runstop, int verbose, int force, int assume_clean, char *bitmap_file, int bitmap_chunk, int write_behind, int delay); extern int Detail(char *dev, int brief, int test, char *homehost); extern int Query(char *dev); extern int Examine(mddev_dev_t devlist, int brief, int scan, int SparcAdjust, struct supertype *forcest, char *homehost); 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); extern int Kill(char *dev, int force, int quiet); extern int CreateBitmap(char *filename, int force, char uuid[16], unsigned long chunksize, unsigned long daemon_sleep, unsigned long write_behind, unsigned long long array_size, int major); extern int ExamineBitmap(char *filename, int brief, struct supertype *st); extern int bitmap_update_uuid(int fd, int *uuid); extern int md_get_version(int fd); extern int get_linux_version(void); extern int parse_uuid(char *str, int uuid[4]); 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 get_mdp_major(void); extern int dev_open(char *dev, int flags); extern int is_standard(char *dev, int *nump); 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 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_line(FILE *file); extern char *conf_word(FILE *file, int allow_key); 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 int same_uuid(int a[4], int b[4], int swapuuid); /* extern int compare_super(mdp_super_t *first, mdp_super_t *second);*/ extern unsigned long calc_csum(void *super, int bytes); extern int enough(int level, int raid_disks, int layout, char *avail, int avail_disks); extern int ask(char *mesg); extern unsigned long long get_component_size(int fd); extern void remove_partitions(int fd); extern char *human_size(long long bytes); char *human_size_brief(long long bytes); extern void put_md_name(char *name); extern char *get_md_name(int dev); extern char DefaultConfFile[]; extern int open_mddev(char *dev, int autof); #define LEVEL_MULTIPATH (-4) #define LEVEL_LINEAR (-1) #define LEVEL_FAULTY (-5) /* faulty stuff */ #define WriteTransient 0 #define ReadTransient 1 #define WritePersistent 2 #define ReadPersistent 3 #define WriteAll 4 /* doesn't go to device */ #define ReadFixable 5 #define Modes 6 #define ClearErrors 31 #define ClearFaults 30 #define AllPersist 100 /* internal use only */ #define NoPersist 101 #define ModeMask 0x1f #define ModeShift 5 #ifdef __TINYC__ #undef minor #undef major #undef makedev #define minor(x) ((x)&0xff) #define major(x) (((x)>>8)&0xff) #define makedev(M,m) (((M)<<8) | (m)) #endif /* for raid5 */ #define ALGORITHM_LEFT_ASYMMETRIC 0 #define ALGORITHM_RIGHT_ASYMMETRIC 1 #define ALGORITHM_LEFT_SYMMETRIC 2 #define ALGORITHM_RIGHT_SYMMETRIC 3