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Diffstat (limited to '')
| -rw-r--r-- | mdadm.h | 1887 |
1 files changed, 1887 insertions, 0 deletions
@@ -0,0 +1,1887 @@ +/* + * mdadm - manage Linux "md" devices aka RAID arrays. + * + * Copyright (C) 2001-2009 Neil Brown <neilb@suse.de> + * + * + * 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: <neilb@suse.de> + */ + +#define _GNU_SOURCE +#define _FILE_OFFSET_BITS 64 +#include <unistd.h> +#ifdef __GLIBC__ +extern __off64_t lseek64 __P ((int __fd, __off64_t __offset, int __whence)); +#elif !defined(lseek64) +# if defined(__NO_STAT64) || __WORDSIZE != 32 +# define lseek64 lseek +# endif +#endif + +#include <sys/types.h> +#include <sys/stat.h> +#include <stdint.h> +#include <stdlib.h> +#include <time.h> +#include <sys/time.h> +#include <getopt.h> +#include <fcntl.h> +#include <stdio.h> +#include <errno.h> +#include <string.h> +#include <syslog.h> +#include <stdbool.h> +/* Newer glibc requires sys/sysmacros.h directly for makedev() */ +#include <sys/sysmacros.h> +#ifdef __dietlibc__ +#include <strings.h> +/* dietlibc has deprecated random and srandom!! */ +#define random rand +#define srandom srand +#endif + +#ifdef NO_COROSYNC +#define CS_OK 1 +typedef uint64_t cmap_handle_t; +#else +#include <corosync/cmap.h> +#endif + +#ifndef NO_DLM +#include <libdlm.h> +#include <errno.h> +#else +#define LKF_NOQUEUE 0x00000001 +#define LKM_PWMODE 4 +#define EUNLOCK 0x10002 + +typedef void *dlm_lshandle_t; + +struct dlm_lksb { + int sb_status; + uint32_t sb_lkid; + char sb_flags; + char *sb_lvbptr; +}; +#endif + +#include <linux/kdev_t.h> +/*#include <linux/fs.h> */ +#include <sys/mount.h> +#include <asm/types.h> +#include <sys/ioctl.h> +#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_CHUNK 512 +#define DEFAULT_BITMAP_CHUNK 4096 +#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. + * /run seems to have emerged as the best standard. + */ +#ifndef MAP_DIR +#define MAP_DIR "/run/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. Best is /var/run/mdadm as + * 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 "/run/mdadm" +#endif /* MDMON_DIR */ + +/* FAILED_SLOTS is where to save files storing recent removal of array + * member in order to allow future reuse of disk inserted in the same + * slot for array recovery + */ +#ifndef FAILED_SLOTS_DIR +#define FAILED_SLOTS_DIR "/run/mdadm/failed-slots" +#endif /* FAILED_SLOTS */ + +#ifndef MDMON_SERVICE +#define MDMON_SERVICE "mdmon" +#endif /* MDMON_SERVICE */ + +#ifndef GROW_SERVICE +#define GROW_SERVICE "mdadm-grow-continue" +#endif /* GROW_SERVICE */ + +#include "md_u.h" +#include "md_p.h" +#include "bitmap.h" +#include "msg.h" + +#include <endian.h> +/* Redhat don't like to #include <asm/byteorder.h>, and + * some time include <linux/byteorder/xxx_endian.h> isn't enough, + * and there is no standard conversion function so... */ +/* And dietlibc doesn't think byteswap is ok, so.. */ +/* #include <byteswap.h> */ +#define __mdadm_bswap_16(x) (((x) & 0x00ffU) << 8 | \ + ((x) & 0xff00U) >> 8) +#define __mdadm_bswap_32(x) (((x) & 0x000000ffU) << 24 | \ + ((x) & 0xff000000U) >> 24 | \ + ((x) & 0x0000ff00U) << 8 | \ + ((x) & 0x00ff0000U) >> 8) +#define __mdadm_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 !defined(__KLIBC__) +#if BYTE_ORDER == LITTLE_ENDIAN +#define __cpu_to_le16(_x) (unsigned int)(_x) +#define __cpu_to_le32(_x) (unsigned int)(_x) +#define __cpu_to_le64(_x) (unsigned long long)(_x) +#define __le16_to_cpu(_x) (unsigned int)(_x) +#define __le32_to_cpu(_x) (unsigned int)(_x) +#define __le64_to_cpu(_x) (unsigned long long)(_x) + +#define __cpu_to_be16(_x) __mdadm_bswap_16(_x) +#define __cpu_to_be32(_x) __mdadm_bswap_32(_x) +#define __cpu_to_be64(_x) __mdadm_bswap_64(_x) +#define __be16_to_cpu(_x) __mdadm_bswap_16(_x) +#define __be32_to_cpu(_x) __mdadm_bswap_32(_x) +#define __be64_to_cpu(_x) __mdadm_bswap_64(_x) +#elif BYTE_ORDER == BIG_ENDIAN +#define __cpu_to_le16(_x) __mdadm_bswap_16(_x) +#define __cpu_to_le32(_x) __mdadm_bswap_32(_x) +#define __cpu_to_le64(_x) __mdadm_bswap_64(_x) +#define __le16_to_cpu(_x) __mdadm_bswap_16(_x) +#define __le32_to_cpu(_x) __mdadm_bswap_32(_x) +#define __le64_to_cpu(_x) __mdadm_bswap_64(_x) + +#define __cpu_to_be16(_x) (unsigned int)(_x) +#define __cpu_to_be32(_x) (unsigned int)(_x) +#define __cpu_to_be64(_x) (unsigned long long)(_x) +#define __be16_to_cpu(_x) (unsigned int)(_x) +#define __be32_to_cpu(_x) (unsigned int)(_x) +#define __be64_to_cpu(_x) (unsigned long long)(_x) +#else +# error "unknown endianness." +#endif +#endif /* __KLIBC__ */ + +/* + * Partially stolen from include/linux/unaligned/packed_struct.h + */ +struct __una_u16 { __u16 x; } __attribute__ ((packed)); +struct __una_u32 { __u32 x; } __attribute__ ((packed)); + +static inline __u16 __get_unaligned16(const void *p) +{ + const struct __una_u16 *ptr = (const struct __una_u16 *)p; + return ptr->x; +} + +static inline __u32 __get_unaligned32(const void *p) +{ + const struct __una_u32 *ptr = (const struct __una_u32 *)p; + return ptr->x; +} + +static inline void __put_unaligned16(__u16 val, void *p) +{ + struct __una_u16 *ptr = (struct __una_u16 *)p; + ptr->x = val; +} + +static inline void __put_unaligned32(__u32 val, void *p) +{ + struct __una_u32 *ptr = (struct __una_u32 *)p; + ptr->x = val; +} + +/* + * Check at compile time that something is of a particular type. + * Always evaluates to 1 so you may use it easily in comparisons. +*/ + +#define typecheck(type,x) \ +({ type __dummy; \ + typeof(x) __dummy2; \ + (void)(&__dummy == &__dummy2); \ + 1; \ +}) + +/* + * These inlines deal with timer wrapping correctly. + * + * time_after(a,b) returns true if the time a is after time b. +*/ + +#define time_after(a,b) \ + (typecheck(unsigned int, a) && \ + typecheck(unsigned int, b) && \ + ((int)((b) - (a)) < 0)) + +#define time_before(a,b) time_after(b,a) + +/* + * 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; }) + +#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0])) + +extern const char Name[]; + +struct md_bb_entry { + unsigned long long sector; + int length; +}; + +struct md_bb { + int supported; + int count; + struct md_bb_entry *entries; +}; + +/* 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 new_data_offset; + 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) + */ +#define NO_RESHAPE 0 +#define VOLUME_RESHAPE 1 +#define CONTAINER_RESHAPE 2 +#define RESHAPE_NO_BACKUP 16 /* Mask 'or'ed in */ + int reshape_active; + unsigned long long reshape_progress; + int recovery_blocked; /* for external metadata it + * indicates that there is + * reshape in progress in + * container, + * for native metadata it is + * reshape_active field mirror + */ + int journal_device_required; + int journal_clean; + + enum { + CONSISTENCY_POLICY_UNKNOWN, + CONSISTENCY_POLICY_NONE, + CONSISTENCY_POLICY_RESYNC, + CONSISTENCY_POLICY_BITMAP, + CONSISTENCY_POLICY_JOURNAL, + CONSISTENCY_POLICY_PPL, + } consistency_policy; + + /* During reshape we can sometimes change the data_offset to avoid + * over-writing still-valid data. We need to know if there is space. + * So getinfo_super will fill in space_before and space_after in sectors. + * data_offset can be increased or decreased by this amount. + */ + unsigned long long space_before, space_after; + 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 */ + }; + long bitmap_offset; /* 0 == none, 1 == a file */ + unsigned int ppl_size; + int ppl_offset; + unsigned long long ppl_sector; + unsigned long safe_mode_delay; /* ms delay to mark clean */ + int new_level, delta_disks, new_layout, new_chunk; + int errors; + unsigned long cache_size; /* size of raid456 stripe cache*/ + int mismatch_cnt; + char text_version[50]; + + 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[32]; + struct mdinfo *devs; + struct mdinfo *next; + + /* Device info for mdmon: */ + int recovery_fd; + int state_fd; + int bb_fd; + int ubb_fd; + #define DS_FAULTY 1 + #define DS_INSYNC 2 + #define DS_WRITE_MOSTLY 4 + #define DS_SPARE 8 + #define DS_BLOCKED 16 + #define DS_REMOVE 1024 + #define DS_UNBLOCK 2048 + int prev_state, curr_state, next_state; + + /* info read from sysfs */ + enum { + ARRAY_CLEAR, + ARRAY_INACTIVE, + ARRAY_SUSPENDED, + ARRAY_READONLY, + ARRAY_READ_AUTO, + ARRAY_CLEAN, + ARRAY_ACTIVE, + ARRAY_WRITE_PENDING, + ARRAY_ACTIVE_IDLE, + ARRAY_BROKEN, + ARRAY_UNKNOWN_STATE, + } array_state; + struct md_bb bb; +}; + +struct createinfo { + int uid; + int gid; + int autof; + int mode; + int symlinks; + int names; + int bblist; + struct supertype *supertype; +}; + +struct spare_criteria { + unsigned long long min_size; + unsigned int sector_size; +}; + +enum mode { + ASSEMBLE=1, + BUILD, + CREATE, + MANAGE, + MISC, + MONITOR, + GROW, + INCREMENTAL, + AUTODETECT, + mode_count +}; + +extern char short_options[]; +extern char short_bitmap_options[]; +extern char short_bitmap_auto_options[]; +extern struct option long_options[]; +extern char Version[], Usage[], Help[], OptionHelp[], + *mode_help[], + Help_create[], Help_build[], Help_assemble[], Help_grow[], + Help_incr[], + Help_manage[], Help_misc[], Help_monitor[], Help_config[]; + +/* for option that don't have short equivilents, we assign arbitrary + * numbers later than any 'short' character option. + */ +enum special_options { + AssumeClean = 300, + BitmapChunk, + WriteBehind, + ReAdd, + NoDegraded, + Sparc22, + BackupFile, + HomeHost, + AutoHomeHost, + Symlinks, + AutoDetect, + Waitclean, + DetailPlatform, + KillSubarray, + UpdateSubarray, + IncrementalPath, + NoSharing, + HelpOptions, + Brief, + NoDevices, + ManageOpt, + Add, + AddSpare, + AddJournal, + Remove, + Fail, + Replace, + With, + MiscOpt, + WaitOpt, + ConfigFile, + ChunkSize, + WriteMostly, + FailFast, + NoFailFast, + Layout, + Auto, + Force, + SuperMinor, + EMail, + ProgramOpt, + Increment, + Fork, + Bitmap, + RebuildMapOpt, + InvalidBackup, + UdevRules, + FreezeReshape, + Continue, + OffRootOpt, + Prefer, + KillOpt, + DataOffset, + ExamineBB, + Dump, + Restore, + Action, + Nodes, + ClusterName, + ClusterConfirm, + WriteJournal, + ConsistencyPolicy, +}; + +enum prefix_standard { + JEDEC, + IEC +}; + +enum bitmap_update { + NoUpdate, + NameUpdate, + NodeNumUpdate, +}; + +enum flag_mode { + FlagDefault, FlagSet, FlagClear, +}; + +/* 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) +struct mddev_ident { + char *devname; + + int uuid_set; + int uuid[4]; + char name[33]; + + int super_minor; + + char *devices; /* comma separated list of device + * names with wild cards + */ + int level; + int raid_disks; + int spare_disks; + struct supertype *st; + int autof; /* 1 for normal, 2 for partitioned */ + char *spare_group; + char *bitmap_file; + int bitmap_fd; + + char *container; /* /dev/whatever name of container, or + * uuid of container. You would expect + * this to be the 'devname' or UUID + * of some other entry. + */ + char *member; /* subarray within a container */ + + struct mddev_ident *next; + union { + /* fields needed by different users of this structure */ + int assembled; /* set when assembly succeeds */ + }; +}; + +struct context { + int readonly; + int runstop; + int verbose; + int brief; + int no_devices; + int force; + char *homehost; + int require_homehost; + char *prefer; + int export; + int test; + char *subarray; + char *update; + int scan; + int SparcAdjust; + int autof; + int delay; + int freeze_reshape; + char *backup_file; + int invalid_backup; + char *action; + int nodes; + char *homecluster; +}; + +struct shape { + int raiddisks; + int sparedisks; + int journaldisks; + int level; + int layout; + char *layout_str; + int chunk; + int bitmap_chunk; + char *bitmap_file; + int assume_clean; + int write_behind; + unsigned long long size; + int consistency_policy; +}; + +/* List of device names - wildcards expanded */ +struct mddev_dev { + char *devname; + int disposition; /* 'a' for add, 'r' for remove, 'f' for fail, + * 'A' for re_add. + * Not set for names read from .config + */ + enum flag_mode writemostly; + enum flag_mode failfast; + int used; /* set when used */ + long long data_offset; + struct mddev_dev *next; +}; + +typedef struct mapping { + char *name; + int num; +} mapping_t; + +struct mdstat_ent { + char devnm[32]; + int active; + char *level; + char *pattern; /* U for up, _ for down */ + int percent; /* -1 if no resync */ + int resync; /* 3 if check, 2 if reshape, 1 if resync, 0 if recovery */ + int devcnt; + int raid_disks; + char * metadata_version; + struct dev_member { + char *name; + struct dev_member *next; + } *members; + struct mdstat_ent *next; +}; + +extern struct mdstat_ent *mdstat_read(int hold, int start); +extern void mdstat_close(void); +extern void free_mdstat(struct mdstat_ent *ms); +extern int mdstat_wait(int seconds); +extern void mdstat_wait_fd(int fd, const sigset_t *sigmask); +extern int mddev_busy(char *devnm); +extern struct mdstat_ent *mdstat_by_component(char *name); +extern struct mdstat_ent *mdstat_by_subdev(char *subdev, char *container); + +struct map_ent { + struct map_ent *next; + char devnm[32]; + char metadata[20]; + int uuid[4]; + int bad; + char *path; +}; +extern int map_update(struct map_ent **mpp, char *devnm, char *metadata, + int uuid[4], char *path); +extern void map_remove(struct map_ent **map, char *devnm); +extern struct map_ent *map_by_uuid(struct map_ent **map, int uuid[4]); +extern struct map_ent *map_by_devnm(struct map_ent **map, char *devnm); +extern void map_free(struct map_ent *map); +extern struct map_ent *map_by_name(struct map_ent **map, char *name); +extern void map_read(struct map_ent **melp); +extern int map_write(struct map_ent *mel); +extern void map_delete(struct map_ent **mapp, char *devnm); +extern void map_add(struct map_ent **melp, + char *devnm, char *metadata, int uuid[4], char *path); +extern int map_lock(struct map_ent **melp); +extern void map_unlock(struct map_ent **melp); +extern void map_fork(void); + +/* various details can be requested */ +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_SAFEMODE = (1 << 9), + GET_BITMAP_LOCATION = (1 << 10), + + GET_DEVS = (1 << 20), /* gets role, major, minor */ + GET_OFFSET = (1 << 21), + GET_SIZE = (1 << 22), + GET_STATE = (1 << 23), + GET_ERROR = (1 << 24), + GET_ARRAY_STATE = (1 << 25), + GET_CONSISTENCY_POLICY = (1 << 26), + GET_DEVS_ALL = (1 << 27), +}; + +/* If fd >= 0, get the array it is open on, + * else use devnm. + */ +extern int sysfs_open(char *devnm, char *devname, char *attr); +extern int sysfs_init(struct mdinfo *mdi, int fd, char *devnm); +extern void sysfs_init_dev(struct mdinfo *mdi, dev_t devid); +extern void sysfs_free(struct mdinfo *sra); +extern struct mdinfo *sysfs_read(int fd, char *devnm, unsigned long options); +extern int sysfs_attr_match(const char *attr, const char *str); +extern int sysfs_match_word(const char *word, char **list); +extern int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev, + char *name, char *val); +extern int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev, + char *name, unsigned long long val); +extern int sysfs_set_num_signed(struct mdinfo *sra, struct mdinfo *dev, + char *name, 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_two(int fd, unsigned long long *v1, unsigned long long *v2); +extern int sysfs_get_two(struct mdinfo *sra, struct mdinfo *dev, + char *name, unsigned long long *v1, unsigned long long *v2); +extern int sysfs_fd_get_str(int fd, char *val, int size); +extern int sysfs_attribute_available(struct mdinfo *sra, struct mdinfo *dev, + char *name); +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, int resume); +extern int sysfs_disk_to_scsi_id(int fd, __u32 *id); +extern int sysfs_unique_holder(char *devnm, long rdev); +extern int sysfs_freeze_array(struct mdinfo *sra); +extern int sysfs_wait(int fd, int *msec); +extern int load_sys(char *path, char *buf, int len); +extern int zero_disk_range(int fd, unsigned long long sector, size_t count); +extern int reshape_prepare_fdlist(char *devname, + struct mdinfo *sra, + int raid_disks, + int nrdisks, + unsigned long blocks, + char *backup_file, + int *fdlist, + unsigned long long *offsets); +extern void reshape_free_fdlist(int *fdlist, + unsigned long long *offsets, + int size); +extern int reshape_open_backup_file(char *backup, + int fd, + char *devname, + long blocks, + int *fdlist, + unsigned long long *offsets, + char *sysfs_name, + int restart); +extern unsigned long compute_backup_blocks(int nchunk, int ochunk, + unsigned int ndata, unsigned int odata); +extern char *locate_backup(char *name); +extern char *make_backup(char *name); + +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, + 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, + unsigned long long start, unsigned long long length, + char *src_buf); + +#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 r0layout[], r5layout[], r6layout[], + pers[], modes[], faultylayout[]; +extern mapping_t consistency_policies[], sysfs_array_states[]; + +extern char *map_dev_preferred(int major, int minor, int create, + char *prefer); +static inline char *map_dev(int major, int minor, int create) +{ + return map_dev_preferred(major, minor, create, NULL); +} + +/** + * is_fd_valid() - check file descriptor. + * @fd: file descriptor. + * + * The function checks if @fd is nonnegative integer and shall be used only + * to verify open() result. + */ +static inline int is_fd_valid(int fd) +{ + return (fd > -1); +} + +/** + * close_fd() - verify, close and unset file descriptor. + * @fd: pointer to file descriptor. + * + * The function closes and invalidates file descriptor if appropriative. It + * ignores incorrect file descriptor quitely to simplify error handling. + */ +static inline void close_fd(int *fd) +{ + if (is_fd_valid(*fd) && close(*fd) == 0) + *fd = -1; +} + +struct active_array; +struct metadata_update; + +/* 'struct reshape' records the intermediate states of + * a general reshape. + * The starting geometry is converted to the 'before' geometry + * by at most an atomic level change. They could be the same. + * Similarly the 'after' geometry is converted to the final + * geometry by at most a level change. + * Note that 'before' and 'after' must have the same level. + * 'blocks' is the minimum number of sectors for a reshape unit. + * This will be a multiple of the stripe size in each of the + * 'before' and 'after' geometries. + * If 'blocks' is 0, no restriping is necessary. + * 'min_offset_change' is the minimum change to data_offset to + * allow the reshape to happen. It is at least the larger of + * the old and new chunk sizes, and typically the same as 'blocks' + * divided by number of data disks. + */ +struct reshape { + int level; + int parity; /* number of parity blocks/devices */ + struct { + int layout; + int data_disks; + } before, after; + unsigned long long backup_blocks; + unsigned long long min_offset_change; + unsigned long long stripes; /* number of old stripes that comprise 'blocks'*/ + unsigned long long new_size; /* New size of array in sectors */ +}; + +/* A superswitch provides entry point to a metadata handler. + * + * The superswitch primarily operates on some "metadata" that + * is accessed via the 'supertype'. + * This metadata has one of three possible sources. + * 1/ It is read from a single device. In this case it may not completely + * describe the array or arrays as some information might be on other + * devices. + * 2/ It is read from all devices in a container. In this case all + * information is present. + * 3/ It is created by ->init_super / ->add_to_super. In this case it will + * be complete once enough ->add_to_super calls have completed. + * + * When creating an array inside a container, the metadata will be + * formed by a combination of 2 and 3. The metadata or the array is read, + * then new information is added. + * + * The metadata must sometimes have a concept of a 'current' array + * and a 'current' device. + * The 'current' array is set by init_super to be the newly created array, + * or is set by super_by_fd when it finds it is looking at an array inside + * a container. + * + * The 'current' device is either the device that the metadata was read from + * in case 1, or the last device added by add_to_super in case 3. + * Case 2 does not identify a 'current' device. + */ +extern struct superswitch { + + /* Used to report details of metadata read from a component + * device. ->load_super has been called. + */ + void (*examine_super)(struct supertype *st, char *homehost); + 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); + int (*examine_badblocks)(struct supertype *st, int fd, char *devname); + int (*copy_metadata)(struct supertype *st, int from, int to); + + /* Used to report details of an active array. + * ->load_super was possibly given a 'component' string. + */ + void (*detail_super)(struct supertype *st, char *homehost, + char *subarray); + void (*brief_detail_super)(struct supertype *st, char *subarray); + void (*export_detail_super)(struct supertype *st); + + /* Optional: platform hardware / firmware details */ + int (*detail_platform)(int verbose, int enumerate_only, char *controller_path); + int (*export_detail_platform)(int verbose, char *controller_path); + + /* Used: + * to get uuid to storing in bitmap metadata + * and 'reshape' backup-data metadata + * To see if a device is being re-added to an array it was part of. + */ + void (*uuid_from_super)(struct supertype *st, int uuid[4]); + + /* 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. + * validate_geometry determining what to create. + * The info includes both array information and device information. + * The particular device should be: + * The last device added by add_to_super + * The device the metadata was loaded from by load_super + * If 'map' is present, then it is an array raid_disks long + * (raid_disk must already be set and correct) and it is filled + * with 1 for slots that are thought to be active and 0 for slots which + * appear to be failed/missing. + * *info is zeroed out before data is added. + */ + void (*getinfo_super)(struct supertype *st, struct mdinfo *info, char *map); + struct mdinfo *(*getinfo_super_disks)(struct supertype *st); + /* Check if the given metadata is flagged as belonging to "this" + * host. 0 for 'no', 1 for 'yes', -1 for "Don't record homehost" + */ + int (*match_home)(struct supertype *st, char *homehost); + + /* Make one of several generic modifications to metadata + * prior to assembly (or other times). + * sparc2.2 - first bug in early 0.90 metadata + * super-minor - change name of 0.90 metadata + * summaries - 'correct' any redundant data + * resync - mark array as dirty to trigger a resync. + * uuid - set new uuid - only 0.90 or 1.x + * name - change the name of the array (where supported) + * homehost - change which host this array is tied to. + * devicesize - If metadata is at start of device, change recorded + * device size to match actual device size + * byteorder - swap bytes for 0.90 metadata + * + * force-one - mark that device as uptodate, not old or failed. + * force-array - mark array as clean if it would not otherwise + * assemble + * assemble - not sure how this is different from force-one... + * linear-grow-new - add a new device to a linear array, but don't + * change the size: so superblock still matches + * linear-grow-update - now change the size of the array. + * writemostly - set the WriteMostly1 bit in the superblock devflags + * readwrite - clear the WriteMostly1 bit in the superblock devflags + * failfast - set the FailFast1 bit in the superblock + * nofailfast - clear the FailFast1 bit + * no-bitmap - clear any record that a bitmap is present. + * bbl - add a bad-block-log if possible + * no-bbl - remove any bad-block-log is it is empty. + * force-no-bbl - remove any bad-block-log even if empty. + * revert-reshape - If a reshape is in progress, modify metadata so + * it will resume going in the opposite direction. + */ + int (*update_super)(struct supertype *st, struct mdinfo *info, + char *update, + char *devname, int verbose, + int uuid_set, char *homehost); + + /* Create new metadata for new array as described. This could + * be a new container, or an array in a pre-existing container. + * Also used to zero metadata prior to writing it to invalidate old + * metadata. + */ + int (*init_super)(struct supertype *st, mdu_array_info_t *info, + struct shape *s, char *name, + char *homehost, int *uuid, + unsigned long long data_offset); + + /* update the metadata to include new device, either at create or + * when hot-adding a spare. + */ + int (*add_to_super)(struct supertype *st, mdu_disk_info_t *dinfo, + int fd, char *devname, + unsigned long long data_offset); + /* update the metadata to delete a device, + * when hot-removing. + */ + int (*remove_from_super)(struct supertype *st, mdu_disk_info_t *dinfo); + + /* Write metadata to one device when fixing problems or adding + * a new device. + */ + int (*store_super)(struct supertype *st, int fd); + + /* Write all metadata for this array. + */ + int (*write_init_super)(struct supertype *st); + /* Check if metadata read from one device is compatible with an array, + * used when assembling an array, or pseudo-assembling was with + * "--examine --brief" + * If "st" has not yet been loaded the superblock from, "tst" is + * moved in, otherwise the superblock in 'st' is compared with + * 'tst'. + */ + int (*compare_super)(struct supertype *st, struct supertype *tst, + int verbose); + /* Load metadata from a single device. If 'devname' is not NULL + * print error messages as appropriate */ + int (*load_super)(struct supertype *st, int fd, char *devname); + /* 'fd' is a 'container' md array - load array metadata from the + * whole container. + */ + int (*load_container)(struct supertype *st, int fd, char *devname); + /* If 'arg' is a valid name of this metadata type, allocate and + * return a 'supertype' for the particular minor version */ + struct supertype * (*match_metadata_desc)(char *arg); + /* If a device has the given size, and the data_offset has been + * requested - work out how much space is available for data. + * This involves adjusting for reserved space (e.g. bitmaps) + * and for any rounding. + * 'mdadm' only calls this for existing arrays where a possible + * spare is being added. However some super-handlers call it + * internally from validate_geometry when creating an array. + */ + __u64 (*avail_size)(struct supertype *st, __u64 size, + unsigned long long data_offset); + /* + * Return spare criteria for array: + * - minimum disk size can be used in array; + * - sector size can be used in array. + * Return values: 0 - for success and -EINVAL on error. + */ + int (*get_spare_criteria)(struct supertype *st, + struct spare_criteria *sc); + /* Find somewhere to put a bitmap - possibly auto-size it - and + * update the metadata to record this. The array may be newly + * created, in which case data_size may be updated, or it might + * already exist. Metadata handler can know if init_super + * has been called, but not write_init_super. + * 0: Success + * -Exxxx: On error + */ + int (*add_internal_bitmap)(struct supertype *st, int *chunkp, + int delay, int write_behind, + unsigned long long size, int may_change, int major); + /* Perform additional setup required to activate a bitmap. + */ + int (*set_bitmap)(struct supertype *st, struct mdinfo *info); + /* Seek 'fd' to start of write-intent-bitmap. Must be an + * md-native format bitmap + */ + int (*locate_bitmap)(struct supertype *st, int fd, int node_num); + /* if add_internal_bitmap succeeded for existing array, this + * writes it out. + */ + int (*write_bitmap)(struct supertype *st, int fd, enum bitmap_update update); + /* Free the superblock and any other allocated data */ + void (*free_super)(struct supertype *st); + + /* validate_geometry is called with an st returned by + * match_metadata_desc. + * It should check that the geometry described is compatible with + * the metadata type. It will be called repeatedly as devices + * 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 KiB. + * Return value is: + * 1: everything is OK + * 0: not OK for some reason - if 'verbose', then error was reported. + * -1: st->sb was NULL, 'subdev' is a member of a container of this + * type, but array is not acceptable for some reason + * message was reported even if verbose is 0. + */ + int (*validate_geometry)(struct supertype *st, int level, int layout, + int raiddisks, + int *chunk, unsigned long long size, + unsigned long long data_offset, + char *subdev, unsigned long long *freesize, + int consistency_policy, int verbose); + + /* Return a linked list of 'mdinfo' structures for all arrays + * in the container. For non-containers, it is like + * getinfo_super with an allocated mdinfo.*/ + struct mdinfo *(*container_content)(struct supertype *st, char *subarray); + /* query the supertype for default geometry */ + void (*default_geometry)(struct supertype *st, int *level, int *layout, int *chunk); /* optional */ + /* Permit subarray's to be deleted from inactive containers */ + int (*kill_subarray)(struct supertype *st, + char *subarray_id); /* optional */ + /* Permit subarray's to be modified */ + int (*update_subarray)(struct supertype *st, char *subarray, + char *update, struct mddev_ident *ident); /* optional */ + /* Check if reshape is supported for this external format. + * st is obtained from super_by_fd() where st->subarray[0] is + * initialized to indicate if reshape is being performed at the + * container or subarray level + */ +#define APPLY_METADATA_CHANGES 1 +#define ROLLBACK_METADATA_CHANGES 0 + + int (*reshape_super)(struct supertype *st, + unsigned long long size, int level, + int layout, int chunksize, int raid_disks, + int delta_disks, char *backup, char *dev, + int direction, + int verbose); /* optional */ + int (*manage_reshape)( /* optional */ + int afd, struct mdinfo *sra, struct reshape *reshape, + struct supertype *st, unsigned long blocks, + int *fds, unsigned long long *offsets, + int dests, int *destfd, unsigned long long *destoffsets); + +/* for mdmon */ + int (*open_new)(struct supertype *c, struct active_array *a, + int inst); + + /* Tell the metadata handler the current state of the array. + * This covers whether it is known to be consistent (no pending writes) + * and how far along a resync is known to have progressed + * (in a->resync_start). + * resync status is really irrelevant if the array is not consistent, + * but some metadata (DDF!) have a place to record the distinction. + * If 'consistent' is '2', then the array can mark it dirty if a + * resync/recovery/whatever is required, or leave it clean if not. + * Return value is 0 dirty (not consistent) and 1 if clean. + * it is only really important if consistent is passed in as '2'. + */ + int (*set_array_state)(struct active_array *a, int consistent); + + /* When the state of a device might have changed, we call set_disk to + * tell the metadata what the current state is. + * Typically this happens on spare->in_sync and (spare|in_sync)->faulty + * transitions. + * set_disk might be called when the state of the particular disk has + * not in fact changed. + */ + void (*set_disk)(struct active_array *a, int n, int state); + void (*sync_metadata)(struct supertype *st); + void (*process_update)(struct supertype *st, + struct metadata_update *update); + /* Prepare updates allocates extra memory that might be + * needed. If the update cannot be understood, return 0. + */ + int (*prepare_update)(struct supertype *st, + struct metadata_update *update); + + /* activate_spare will check if the array is degraded and, if it + * is, try to find some spare space in the container. + * On success, it add appropriate updates (For process_update) to + * to the 'updates' list and returns a list of 'mdinfo' identifying + * the device, or devices as there might be multiple missing + * devices and multiple spares available. + */ + struct mdinfo *(*activate_spare)(struct active_array *a, + struct metadata_update **updates); + /* + * Return statically allocated string that represents metadata specific + * controller domain of the disk. The domain is used in disk domain + * matching functions. Disks belong to the same domain if the they have + * the same domain from mdadm.conf and belong the same metadata domain. + * Returning NULL or not providing this handler means that metadata + * does not distinguish the differences between disks that belong to + * different controllers. They are in the domain specified by + * configuration file (mdadm.conf). + * In case when the metadata has the notion of domains based on disk + * it shall return NULL for disks that do not belong to the controller + * the supported domains. Such disks will form another domain and won't + * be mixed with supported ones. + */ + const char *(*get_disk_controller_domain)(const char *path); + + /* for external backup area */ + int (*recover_backup)(struct supertype *st, struct mdinfo *info); + + /* validate container after assemble */ + int (*validate_container)(struct mdinfo *info); + + /* write initial empty PPL on device */ + int (*write_init_ppl)(struct supertype *st, struct mdinfo *info, int fd); + + /* validate ppl before assemble */ + int (*validate_ppl)(struct supertype *st, struct mdinfo *info, + struct mdinfo *disk); + + /* records new bad block in metadata */ + int (*record_bad_block)(struct active_array *a, int n, + unsigned long long sector, int length); + + /* clears bad block from metadata */ + int (*clear_bad_block)(struct active_array *a, int n, + unsigned long long sector, int length); + + /* get list of bad blocks from metadata */ + struct md_bb *(*get_bad_blocks)(struct active_array *a, int n); + + int swapuuid; /* true if uuid is bigending rather than hostendian */ + int external; + const char *name; /* canonical metadata name */ +} *superlist[]; + +extern struct superswitch super0, super1; +extern struct superswitch super_imsm, super_ddf; +extern struct superswitch mbr, gpt; + +struct metadata_update { + int len; + char *buf; + void *space; /* allocated space that monitor will use */ + void **space_list; /* list of allocated spaces that monitor can + * use or that it returned. + */ + struct metadata_update *next; +}; + +/* A supertype holds a particular collection of metadata. + * It identifies the metadata type by the superswitch, and the particular + * sub-version of that metadata type. + * metadata read in or created is stored in 'sb' and 'info'. + * There are also fields used by mdmon to track containers. + * + * A supertype may refer to: + * Just an array, possibly in a container + * A container, not identifying any particular array + * Info read from just one device, not yet fully describing the array/container. + * + * + * A supertype is created by: + * super_by_fd + * guess_super + * dup_super + */ +struct supertype { + struct superswitch *ss; + int minor_version; + int max_devs; + char container_devnm[32]; /* devnm of container */ + void *sb; + void *info; + void *other; /* Hack used to convert v0.90 to v1.0 */ + unsigned long long devsize; + unsigned long long data_offset; /* used by v1.x only */ + int ignore_hw_compat; /* used to inform metadata handlers that it should ignore + HW/firmware related incompatability to load metadata. + Used when examining metadata to display content of disk + when user has no hw/firmare compatible system. + */ + struct metadata_update *updates; + struct metadata_update **update_tail; + + /* extra stuff used by mdmon */ + struct active_array *arrays; + int sock; /* listen to external programs */ + char devnm[32]; /* e.g. md0. This appears in metadata_version: + * external:/md0/12 + */ + int devcnt; + int retry_soon; + int nodes; + char *cluster_name; + + struct mdinfo *devs; + +}; + +extern struct supertype *super_by_fd(int fd, char **subarray); +enum guess_types { guess_any, guess_array, guess_partitions }; +extern struct supertype *guess_super_type(int fd, enum guess_types guess_type); +static inline struct supertype *guess_super(int fd) { + return guess_super_type(fd, guess_any); +} +extern struct supertype *dup_super(struct supertype *st); +extern int get_dev_size(int fd, char *dname, unsigned long long *sizep); +extern int get_dev_sector_size(int fd, char *dname, unsigned int *sectsizep); +extern int must_be_container(int fd); +extern int dev_size_from_id(dev_t id, unsigned long long *size); +extern int dev_sector_size_from_id(dev_t id, unsigned int *size); +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; + const char *value; +}; + +extern char pol_act[], pol_domain[], pol_metadata[], pol_auto[]; + +/* 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_add(char *type, ...); +extern void policy_free(void); + +extern struct dev_policy *path_policy(char **paths, char *type); +extern struct dev_policy *disk_policy(struct mdinfo *disk); +extern struct dev_policy *devid_policy(int devid); +extern void dev_policy_free(struct dev_policy *p); + +//extern void pol_new(struct dev_policy **pol, char *name, char *val, char *metadata); +extern void pol_add(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, /* This only applies to bare devices */ + act_spare_same_slot, /* this allows non-bare devices, + * but only if recent removal */ + act_force_spare, /* this allow non-bare devices in any case */ + 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; + const 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 domainlist_add_dev(struct domainlist **dom, int devid, + const char *metadata); +extern void domain_free(struct domainlist *dl); +extern void domain_merge(struct domainlist **domp, struct dev_policy *pol, + const char *metadata); +void domain_add(struct domainlist **domp, char *domain); + +extern void policy_save_path(char *id_path, struct map_ent *array); +extern int policy_check_path(struct mdinfo *disk, struct map_ent *array); + +extern void sysfs_rules_apply(char *devnm, struct mdinfo *dev); +extern void sysfsline(char *line); + +#if __GNUC__ < 3 +struct stat64; +#endif + +#define HAVE_NFTW we assume +#define HAVE_FTW + +#ifdef __UCLIBC__ +# include <features.h> +# ifndef __UCLIBC_HAS_LFS__ +# define lseek64 lseek +# endif +# ifndef __UCLIBC_HAS_FTW__ +# undef HAVE_FTW +# undef HAVE_NFTW +# endif +#endif + +#ifdef __dietlibc__ +# undef HAVE_NFTW +#endif + +#if defined(__KLIBC__) +# undef HAVE_NFTW +# undef HAVE_FTW +#endif + +#ifndef HAVE_NFTW +# define FTW_PHYS 1 +# ifndef HAVE_FTW + struct FTW {}; +# endif +#endif + +#ifdef HAVE_FTW +# include <ftw.h> +#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_run(char *devname, int fd, struct context *c); +extern int Manage_stop(char *devname, int fd, int quiet, + int will_retry); +extern int Manage_subdevs(char *devname, int fd, + struct mddev_dev *devlist, int verbose, int test, + char *update, int force); +extern int autodetect(void); +extern int Grow_Add_device(char *devname, int fd, char *newdev); +extern int Grow_addbitmap(char *devname, int fd, + struct context *c, struct shape *s); +extern int Grow_reshape(char *devname, int fd, + struct mddev_dev *devlist, + unsigned long long data_offset, + struct context *c, struct shape *s); +extern int Grow_restart(struct supertype *st, struct mdinfo *info, + int *fdlist, int cnt, char *backup_file, int verbose); +extern int Grow_continue(int mdfd, struct supertype *st, + struct mdinfo *info, char *backup_file, + int forked, int freeze_reshape); +extern int Grow_consistency_policy(char *devname, int fd, + struct context *c, struct shape *s); + +extern int restore_backup(struct supertype *st, + struct mdinfo *content, + int working_disks, + int spares, + char **backup_filep, + int verbose); +extern int Grow_continue_command(char *devname, int fd, + char *backup_file, int verbose); + +extern int Assemble(struct supertype *st, char *mddev, + struct mddev_ident *ident, + struct mddev_dev *devlist, + struct context *c); + +extern int Build(char *mddev, struct mddev_dev *devlist, + struct shape *s, struct context *c); + +extern int Create(struct supertype *st, char *mddev, + char *name, int *uuid, + int subdevs, struct mddev_dev *devlist, + struct shape *s, + struct context *c, + unsigned long long data_offset); + +extern int Detail(char *dev, struct context *c); +extern int Detail_Platform(struct superswitch *ss, int scan, int verbose, int export, char *controller_path); +extern int Query(char *dev); +extern int ExamineBadblocks(char *devname, int brief, struct supertype *forcest); +extern int Examine(struct mddev_dev *devlist, struct context *c, + struct supertype *forcest); +extern int Monitor(struct mddev_dev *devlist, + char *mailaddr, char *alert_cmd, + struct context *c, + int daemonise, int oneshot, + int dosyslog, char *pidfile, int increments, + int share); + +extern int Kill(char *dev, struct supertype *st, int force, int verbose, int noexcl); +extern int Kill_subarray(char *dev, char *subarray, int verbose); +extern int Update_subarray(char *dev, char *subarray, char *update, struct mddev_ident *ident, int quiet); +extern int Wait(char *dev); +extern int WaitClean(char *dev, int verbose); +extern int SetAction(char *dev, char *action); + +extern int Incremental(struct mddev_dev *devlist, struct context *c, + struct supertype *st); +extern void RebuildMap(void); +extern int IncrementalScan(struct context *c, char *devnm); +extern int IncrementalRemove(char *devname, char *path, int verbose); +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 IsBitmapDirty(char *filename); +extern int Write_rules(char *rule_name); +extern int bitmap_update_uuid(int fd, int *uuid, int swap); + +/* calculate the size of the bitmap given the array size and bitmap chunksize */ +static inline unsigned long long +bitmap_bits(unsigned long long array_size, unsigned long chunksize) +{ + return (array_size * 512 + chunksize - 1) / chunksize; +} + +extern int Dump_metadata(char *dev, char *dir, struct context *c, + struct supertype *st); +extern int Restore_metadata(char *dev, char *dir, struct context *c, + struct supertype *st, int only); + +int md_array_valid(int fd); +int md_array_active(int fd); +int md_array_is_active(struct mdinfo *info); +int md_get_array_info(int fd, struct mdu_array_info_s *array); +int md_set_array_info(int fd, struct mdu_array_info_s *array); +int md_get_disk_info(int fd, struct mdu_disk_info_s *disk); +extern int get_linux_version(void); +extern int mdadm_version(char *version); +extern unsigned long long parse_size(char *size); +extern int parse_uuid(char *str, int uuid[4]); +extern int is_near_layout_10(int layout); +extern int parse_layout_10(char *layout); +extern int parse_layout_faulty(char *layout); +extern int parse_num(int *dest, char *num); +extern int parse_cluster_confirm_arg(char *inp, char **devname, int *slot); +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, + unsigned long long size); +extern int fstat_is_blkdev(int fd, char *devname, dev_t *rdev); +extern int stat_is_blkdev(char *devname, dev_t *rdev); + +extern bool is_dev_alive(char *path); +extern int get_mdp_major(void); +extern int get_maj_min(char *dev, int *major, int *minor); +extern int dev_open(char *dev, int flags); +extern int open_dev(char *devnm); +extern void reopen_mddev(int mdfd); +extern int open_dev_flags(char *devnm, int flags); +extern int open_dev_excl(char *devnm); +extern int is_standard(char *dev, int *nump); +extern int same_dev(char *one, char *two); +extern int compare_paths (char* path1,char* path2); +extern void enable_fds(int devices); +extern void manage_fork_fds(int close_all); +extern int continue_via_systemd(char *devnm, char *service_name); + +extern int parse_auto(char *str, char *msg, int config); +extern struct mddev_ident *conf_get_ident(char *dev); +extern struct mddev_dev *conf_get_devs(void); +extern int conf_test_dev(char *devname); +extern int conf_test_metadata(const char *version, struct dev_policy *pol, 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(int *require_homehostp); +extern char *conf_get_homecluster(void); +extern int conf_get_monitor_delay(void); +extern char *conf_line(FILE *file); +extern char *conf_word(FILE *file, int allow_key); +extern void print_quoted(char *str); +extern void print_escape(char *str); +extern int use_udev(void); +extern unsigned long GCD(unsigned long a, unsigned long b); +extern int conf_name_is_free(char *name); +extern int conf_verify_devnames(struct mddev_ident *array_list); +extern int devname_matches(char *name, char *match); +extern struct mddev_ident *conf_match(struct supertype *st, + struct mdinfo *info, + char *devname, + int verbose, int *rvp); + +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_zero[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); +extern int enough(int level, int raid_disks, int layout, int clean, + char *avail); +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 int test_partition_from_id(dev_t id); +extern int get_data_disks(int level, int layout, int raid_disks); +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); +extern void append_metadata_update(struct supertype *st, void *buf, int len); +extern int assemble_container_content(struct supertype *st, int mdfd, + struct mdinfo *content, + struct context *c, + char *chosen_name, int *result); +#define INCR_NO 1 +#define INCR_UNSAFE 2 +#define INCR_ALREADY 4 +#define INCR_YES 8 +extern struct mdinfo *container_choose_spares(struct supertype *st, + struct spare_criteria *criteria, + struct domainlist *domlist, + char *spare_group, + const char *metadata, int get_one); +extern int move_spare(char *from_devname, char *to_devname, dev_t devid); +extern int add_disk(int mdfd, struct supertype *st, + struct mdinfo *sra, struct mdinfo *info); +extern int remove_disk(int mdfd, struct supertype *st, + struct mdinfo *sra, struct mdinfo *info); +extern int hot_remove_disk(int mdfd, unsigned long dev, int force); +extern int sys_hot_remove_disk(int statefd, int force); +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, int prefix); +extern void print_r10_layout(int layout); + +extern char *find_free_devnm(int use_partitions); + +extern void put_md_name(char *name); +extern char *devid2kname(dev_t devid); +extern char *devid2devnm(dev_t devid); +extern dev_t devnm2devid(char *devnm); +extern char *get_md_name(char *devnm); + +extern char DefaultConfFile[]; + +extern int create_mddev(char *dev, char *name, int autof, int trustworthy, + char *chosen, int block_udev); +/* 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 metadata_container_matches(char *metadata, char *devnm); +extern int metadata_subdev_matches(char *metadata, char *devnm); +extern int is_container_member(struct mdstat_ent *ent, char *devname); +extern int is_subarray_active(char *subarray, char *devname); +extern int open_subarray(char *dev, char *subarray, struct supertype *st, int quiet); +extern struct superswitch *version_to_superswitch(char *vers); + +extern int mdmon_running(char *devnm); +extern int mdmon_pid(char *devnm); +extern int check_env(char *name); +extern __u32 random32(void); +extern void random_uuid(__u8 *buf); +extern int start_mdmon(char *devnm); + +extern int child_monitor(int afd, struct mdinfo *sra, struct reshape *reshape, + struct supertype *st, unsigned long stripes, + int *fds, unsigned long long *offsets, + int dests, int *destfd, unsigned long long *destoffsets); +void abort_reshape(struct mdinfo *sra); + +void *super1_make_v0(struct supertype *st, struct mdinfo *info, mdp_super_t *sb0); + +extern char *stat2kname(struct stat *st); +extern char *fd2kname(int fd); +extern char *stat2devnm(struct stat *st); +extern char *fd2devnm(int fd); +extern void udev_block(char *devnm); +extern void udev_unblock(void); + +extern int in_initrd(void); + +struct cmap_hooks { + void *cmap_handle; /* corosync lib related */ + + int (*initialize)(cmap_handle_t *handle); + int (*get_string)(cmap_handle_t handle, + const char *string, + char **name); + int (*finalize)(cmap_handle_t handle); +}; + +extern void set_cmap_hooks(void); +extern void set_hooks(void); + +struct dlm_hooks { + void *dlm_handle; /* dlm lib related */ + + dlm_lshandle_t (*create_lockspace)(const char *name, + unsigned int mode); + dlm_lshandle_t (*open_lockspace)(const char *name); + int (*release_lockspace)(const char *name, dlm_lshandle_t ls, + int force); + int (*ls_lock)(dlm_lshandle_t lockspace, uint32_t mode, + struct dlm_lksb *lksb, uint32_t flags, + const void *name, unsigned int namelen, + uint32_t parent, void (*astaddr) (void *astarg), + void *astarg, void (*bastaddr) (void *astarg), + void *range); + int (*ls_unlock_wait)(dlm_lshandle_t lockspace, uint32_t lkid, + uint32_t flags, struct dlm_lksb *lksb); + int (*ls_get_fd)(dlm_lshandle_t ls); + int (*dispatch)(int fd); +}; + +extern int get_cluster_name(char **name); +extern int dlm_funs_ready(void); +extern int cluster_get_dlmlock(void); +extern int cluster_release_dlmlock(void); +extern void set_dlm_hooks(void); + +#define _ROUND_UP(val, base) (((val) + (base) - 1) & ~(base - 1)) +#define ROUND_UP(val, base) _ROUND_UP(val, (typeof(val))(base)) +#define ROUND_UP_PTR(ptr, base) ((typeof(ptr)) \ + (ROUND_UP((unsigned long)(ptr), base))) + +static inline int is_subarray(char *vers) +{ + /* The version string for a 'subarray' (an array in a container) + * is + * /containername/componentname for normal read-write arrays + * -containername/componentname for arrays which mdmon must not + * reconfigure. They might be read-only + * or might be undergoing reshape etc. + * containername is e.g. md0, md_d1 + * componentname is dependant on the metadata. e.g. '1' 'S1' ... + */ + return (*vers == '/' || *vers == '-'); +} + +static inline char *to_subarray(struct mdstat_ent *ent, char *container) +{ + return &ent->metadata_version[10+strlen(container)+1]; +} + +#ifdef DEBUG +#define dprintf(fmt, arg...) \ + fprintf(stderr, "%s: %s: "fmt, Name, __func__, ##arg) +#define dprintf_cont(fmt, arg...) \ + fprintf(stderr, fmt, ##arg) +#else +#define dprintf(fmt, arg...) \ + ({ if (0) fprintf(stderr, "%s: %s: " fmt, Name, __func__, ##arg); 0; }) +#define dprintf_cont(fmt, arg...) \ + ({ if (0) fprintf(stderr, fmt, ##arg); 0; }) +#endif +#include <assert.h> +#include <stdarg.h> +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; +} + +#ifdef DEBUG +#define pr_err(fmt, args...) fprintf(stderr, "%s: %s: "fmt, Name, __func__, ##args) +#else +#define pr_err(fmt, args...) fprintf(stderr, "%s: "fmt, Name, ##args) +#endif +#define cont_err(fmt ...) fprintf(stderr, " " fmt) + +void *xmalloc(size_t len); +void *xrealloc(void *ptr, size_t len); +void *xcalloc(size_t num, size_t size); +char *xstrdup(const char *str); + +#define LEVEL_MULTIPATH (-4) +#define LEVEL_LINEAR (-1) +#define LEVEL_FAULTY (-5) + +/* kernel module doesn't know about these */ +#define LEVEL_CONTAINER (-100) +#define LEVEL_UNSUPPORTED (-200) + +/* the kernel does know about this one ... */ +#define LEVEL_NONE (-1000000) + +/* 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 + +enum r0layout { + RAID0_ORIG_LAYOUT = 1, + RAID0_ALT_MULTIZONE_LAYOUT = 2, +}; + +/* 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 + +#define RESYNC_NONE -1 +#define RESYNC_DELAYED -2 +#define RESYNC_PENDING -3 +#define RESYNC_REMOTE -4 +#define RESYNC_UNKNOWN -5 + +/* When using "GET_DISK_INFO" it isn't certain how high + * we need to check. So we impose an absolute limit of + * MAX_DISKS. This needs to be much more than the largest + * number of devices any metadata can support. Currently + * v1.x can support 1920 + */ +#define MAX_DISKS 4096 + +/* Sometimes the 'size' value passed needs to mean "Maximum". + * In those cases with use MAX_SIZE + */ +#define MAX_SIZE 1 + +/* We want to use unsigned numbers for sector counts, but need + * a value for 'invalid'. Use '1'. + */ +#define INVALID_SECTORS 1 +/* And another special number needed for --data_offset=variable */ +#define VARIABLE_OFFSET 3 + +/** + * This is true for native and DDF, IMSM allows 16. + */ +#define MD_NAME_MAX 32 |