[thirdparty/mdadm.git] / mdadm.h

/*
 * mdadm - manage Linux "md" devices aka RAID arrays.
 *
 * Copyright (C) 2001-2006 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@cse.unsw.edu.au>
 *    Paper: Neil Brown
 *           School of Computer Science and Engineering
 *           The University of New South Wales
 *           Sydney, 2052
 *           Australia
 */

#define _GNU_SOURCE
#define _FILE_OFFSET_BITS 64
#include        <unistd.h>
#if !defined(__dietlibc__) && !defined(__KLIBC__)
extern __off64_t lseek64 __P ((int __fd, __off64_t __offset, int __whence));
#else
# if defined(__NO_STAT64) || __WORDSIZE != 32
# define lseek64 lseek
# endif
#endif

#include        <sys/types.h>
#include        <sys/stat.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>
#ifdef __dietlibc__
#include        <strings.h>
/* dietlibc has deprecated random and srandom!! */
#define random rand
#define srandom srand
#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_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        "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 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 !defined(__KLIBC__)
#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)

#define __cpu_to_be16(_x) bswap_16(_x)
#define __cpu_to_be32(_x) bswap_32(_x)
#define __cpu_to_be64(_x) bswap_64(_x)
#define __be16_to_cpu(_x) bswap_16(_x)
#define __be32_to_cpu(_x) bswap_32(_x)
#define __be64_to_cpu(_x) bswap_64(_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)

#define __cpu_to_be16(_x) (_x)
#define __cpu_to_be32(_x) (_x)
#define __cpu_to_be64(_x) (_x)
#define __be16_to_cpu(_x) (_x)
#define __be32_to_cpu(_x) (_x)
#define __be64_to_cpu(_x) (_x)
#else
#  error "unknown endianness."
#endif
#endif /* __KLIBC__ */



/* 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; /* same as array.size, except in
                                                 * sectors and up to 64bits.
                                                 */
        int                     reshape_active;
        unsigned long long      reshape_progress;
        unsigned long long      resync_start;
        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*/
        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 */

        char            sys_name[20];
        struct mdinfo *devs;
        struct mdinfo *next;

        /* Device info for mdmon: */
        int state_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;

};

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,
        INCREMENTAL,
        AUTODETECT,
};

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[],
        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
 * 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,
        AutoDetect,
        Waitclean,
        DetailPlatform,
};

/* 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;

        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_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;       /* 1 for 'set writemostly', 2 for 'clear writemostly' */
        char re_add;
        char used;              /* set when used */
        struct mdinfo *content; /* If devname is a container, this might list
                                 * the remaining member arrays. */
        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 */
        int             devcnt;
        int             raid_disks;
        int             chunk_size;
        char *          metadata_version;
        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);
extern void mdstat_wait_fd(int fd, const sigset_t *sigmask);
extern int mddev_busy(int devnum);

struct map_ent {
        struct map_ent *next;
        int     devnum;
        char    metadata[20];
        int     uuid[4];
        int     bad;
        char    *path;
};
extern int map_update(struct map_ent **mpp, int devnum, char *metadata,
                      int uuid[4], char *path);
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);
extern void map_read(struct map_ent **melp);
extern int map_write(struct map_ent *mel);
extern void map_delete(struct map_ent **mapp, int devnum);
extern void map_free(struct map_ent *map);
extern void map_add(struct map_ent **melp,
                    int devnum, char *metadata, int uuid[4], char *path);
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

/* If fd >= 0, get the array it is open on,
 * else use devnum. >=0 -> major9. <0.....
 */
extern int sysfs_open(int devnum, char *devname, char *attr);
extern void sysfs_init(struct mdinfo *mdi, int fd, int devnum);
extern void sysfs_free(struct mdinfo *sra);
extern struct mdinfo *sysfs_read(int fd, int devnum, 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_uevent(struct mdinfo *sra, char *event);
extern int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev,
                        char *name, unsigned long long *val);
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_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);


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);

struct active_array;
struct metadata_update;

/* A superswitch provides entry point the a metadata handler.
 *
 * The super_switch 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);
        void (*export_examine_super)(struct supertype *st);

        /* Used to report details of an active array.
         * ->load_super was possibly given a 'component' string.
         */
        void (*detail_super)(struct supertype *st, char *homehost);
        void (*brief_detail_super)(struct supertype *st);
        void (*export_detail_super)(struct supertype *st);

        /* Optional: platform hardware / firmware details */
        int (*detail_platform)(int verbose);

        /* 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
         */
        void (*getinfo_super)(struct supertype *st, struct mdinfo *info);

        /* 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.
         */
        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,
                          unsigned long long size, char *name,
                          char *homehost, int *uuid);

        /* 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);

        /* 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);
        int (*compare_super)(struct supertype *st, struct supertype *tst);
        int (*load_super)(struct supertype *st, int fd, char *devname);
        struct supertype * (*match_metadata_desc)(char *arg);
        __u64 (*avail_size)(struct supertype *st, __u64 size);
        int (*add_internal_bitmap)(struct supertype *st, int *chunkp,
                                   int delay, int write_behind,
                                   unsigned long long size, int may_change, int major);
        void (*locate_bitmap)(struct supertype *st, int fd);
        int (*write_bitmap)(struct supertype *st, int fd);
        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 in 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 bytes.
         */
        int (*validate_geometry)(struct supertype *st, int level, int layout,
                                 int raiddisks,
                                 int chunk, unsigned long long size,
                                 char *subdev, unsigned long long *freesize,
                                 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 */

/* for mdmon */
        int (*open_new)(struct supertype *c, struct active_array *a,
                        char *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);
        void (*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);

        int swapuuid; /* true if uuid is bigending rather than hostendian */
        int external;
        const char *name; /* canonical metadata name */
} super0, super1, super_ddf, *superlist[];

extern struct superswitch super_imsm;

struct metadata_update {
        int     len;
        char    *buf;
        void    *space; /* allocated space that monitor will use */
        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;
        int container_dev;    /* devnum of container */
        char subarray[32];      /* name of array inside container */
        void *sb;
        void *info;
        int loaded_container;   /* Set if load_super found a container,
                                 * not just one device */

        struct metadata_update *updates;
        struct metadata_update **update_tail;

        /* extra stuff used by mdmon */
        struct active_array *arrays;
        int sock; /* listen to external programs */
        int devnum;
        char *devname; /* e.g. md0.  This appears in metadata_verison:
                        *  external:/md0/12
                        */
        int devcnt;

        struct mdinfo *devs;

};

extern struct supertype *super_by_fd(int fd);
extern struct supertype *guess_super(int fd);
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);

#if __GNUC__ < 3
struct stat64;
#endif

#define HAVE_NFTW  we assume
#define HAVE_FTW

#ifdef UCLIBC
# include <features.h>
# 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_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 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);
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,
                    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 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);


extern int Create(struct supertype *st, char *mddev,
                  int chunk, int level, int layout, unsigned long long size, int raiddisks, int sparedisks,
                  char *name, char *homehost, int *uuid,
                  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, int autof);

extern int Detail(char *dev, int brief, int export, int test, char *homehost);
extern int Detail_Platform(struct superswitch *ss, int scan, int verbose);
extern int Query(char *dev);
extern int Examine(mddev_dev_t devlist, int brief, int export, 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, int noexcl);
extern int Wait(char *dev);
extern int WaitClean(char *dev, int verbose);

extern int Incremental(char *devname, int verbose, int runstop,
                       struct supertype *st, char *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 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, int swap);
extern unsigned long bitmap_sectors(struct bitmap_super_s *bsb);

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 open_dev(int devnum);
extern int open_dev_excl(int devnum);
extern int is_standard(char *dev, int *nump);
extern int same_dev(char *one, char *two);

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 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 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(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, int avail_disks);
extern int ask(char *mesg);
extern unsigned long long get_component_size(int fd);
extern void remove_partitions(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);
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, int runstop,
                                      char *chosen_name, int verbose);

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);

extern char *human_size(long long bytes);
extern char *human_size_brief(long long bytes);
extern void print_r10_layout(int layout);

#define NoMdDev (1<<23)
extern int find_free_devnum(int use_partitions);

extern void put_md_name(char *name);
extern char *get_md_name(int dev);

extern char DefaultConfFile[];

extern int create_mddev(char *dev, char *name, int autof, int trustworthy,
                        char *chosen);
/* values for 'trustworthy' */
#define LOCAL   1
#define FOREIGN 2
#define METADATA 3
extern int open_mddev(char *dev, int report_errors);
extern int open_container(int fd);

extern int mdmon_running(int devnum);
extern int signal_mdmon(int devnum);
extern int check_env(char *name);
extern int start_mdmon(int devnum);

extern char *devnum2devname(int num);
extern int devname2devnum(char *name);
extern int stat2devnum(struct stat *st);
extern int fd2devnum(int fd);

static inline int dev2major(int d)
{
        if (d >= 0)
                return MD_MAJOR;
        else
                return get_mdp_major();
}

static inline int dev2minor(int d)
{
        if (d >= 0)
                return d;
        return (-1-d) << MdpMinorShift;
}

static inline int ROUND_UP(int a, int base)
{
        return ((a+base-1)/base)*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 read-only arrays.
         * containername is e.g. md0, md_d1
         * componentname is dependant on the metadata. e.g. '1' 'S1' ...
         */
        return (*vers == '/' || *vers == '-');
}

#ifdef DEBUG
#define dprintf(fmt, arg...) \
        fprintf(stderr, fmt, ##arg)
#else
#define dprintf(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 = asprintf(strp, fmt, ap);
        va_end(ap);
        assert(ret >= 0);
        return ret;
}

#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)


/* 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