[thirdparty/mdadm.git] / mdadm.h

/*
 * mdadm - manage Linux "md" devices aka RAID arrays.
 *
 * Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au>
 *
 *
 *    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	__USE_LARGEFILE64
#include	<unistd.h>
#ifndef __dietlibc__
extern __off64_t lseek64 __P ((int __fd, __off64_t __offset, int __whence));
#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__NONO
int strncmp(const char *s1, const char *s2, size_t n) __THROW __pure__;
char *strncpy(char *dest, const char *src, size_t n) __THROW;
#include    <strings.h>
#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 <endian.h>
/* #include "asm/byteorder.h" Redhat don't like this so... */
#if __BYTE_ORDER == __LITTLE_ENDIAN
#  include <linux/byteorder/little_endian.h>
#elif __BYTE_ORDER == __BIG_ENDIAN
#  include <linux/byteorder/big_endian.h>
#elif __BYTE_ORDER == __PDP_ENDIAN
#  include <linux/byteorder/pdp_endian.h>
#else
#  error "unknown endianness."
#endif


/* general information that might be extracted from a superblock */
struct mdinfo {
	mdu_array_info_t	array;
	mdu_disk_info_t		disk;
	__u64			events;
	int			uuid[4];
};

#define Name "mdadm"

enum mode {
	ASSEMBLE=1,
	BUILD,
	CREATE,
	MANAGE,
	MISC,
	MONITOR,
	GROW,
};

extern char short_options[];
extern char short_bitmap_auto_options[];
extern struct option long_options[];
extern char Version[], Usage[], Help[], OptionHelp[],
	Help_create[], Help_build[], Help_assemble[], Help_grow[],
	Help_manage[], Help_misc[], Help_monitor[], Help_config[];

/* 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;
	int	bitmap_fd;

	struct mddev_ident_s *next;
} *mddev_ident_t;

/* List of device names - wildcards expanded */
typedef struct mddev_dev_s {
	char *devname;
	char disposition;	/* 'a' for add, 'r' for remove, 'f' for fail.
				 * Not set for names read from .config
				 */
	char writemostly;
	char re_add;
	struct mddev_dev_s *next;
} *mddev_dev_t;

typedef struct mapping {
	char *name;
	int num;
} mapping_t;


struct mdstat_ent {
	char		*dev;
	int		devnum;
	int		active;
	char		*level;
	char		*pattern; /* U or up, _ for down */
	int		percent; /* -1 if no resync */
	int		resync; /* 1 if resync, 0 if recovery */
	struct mdstat_ent *next;
};

extern struct mdstat_ent *mdstat_read(int hold, int start);
extern void free_mdstat(struct mdstat_ent *ms);
extern void mdstat_wait(int seconds);

#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);


extern struct superswitch {
	void (*examine_super)(void *sbv);
	void (*brief_examine_super)(void *sbv);
	void (*detail_super)(void *sbv);
	void (*brief_detail_super)(void *sbv);
	void (*uuid_from_super)(int uuid[4], void *sbv);
	void (*getinfo_super)(struct mdinfo *info, mddev_ident_t ident, void *sbv);
	int (*update_super)(struct mdinfo *info, void *sbv, char *update, char *devname, int verbose);
	__u64 (*event_super)(void *sbv);
	int (*init_super)(struct supertype *st, void **sbp, mdu_array_info_t *info, unsigned long long size, char *name);
	void (*add_to_super)(void *sbv, mdu_disk_info_t *dinfo);
	int (*store_super)(struct supertype *st, int fd, void *sbv);
	int (*write_init_super)(struct supertype *st, void *sbv, mdu_disk_info_t *dinfo, char *devname);
	int (*compare_super)(void **firstp, void *secondv);
	int (*load_super)(struct supertype *st, int fd, void **sbp, char *devname);
	struct supertype * (*match_metadata_desc)(char *arg);
	__u64 (*avail_size)(struct supertype *st, __u64 size);
	int (*add_internal_bitmap)(struct supertype *st, void *sbv, int chunk, int delay, int write_behind,
				   unsigned long long size, int may_change, int major);
	void (*locate_bitmap)(struct supertype *st, int fd, void *sbv);
	int (*write_bitmap)(struct supertype *st, int fd, void *sbv);
	int major;
	int swapuuid; /* true if uuid is bigending rather than hostendian */
} super0, super1, *superlist[];

struct supertype {
	struct superswitch *ss;
	int minor_version;
	int max_devs;
};

extern struct supertype *super_by_version(int vers, int minor);
extern struct supertype *guess_super(int fd);

#if __GNUC__ < 3
struct stat64;
#endif

#ifdef UCLIBC
  struct FTW {};
# define FTW_PHYS 1
#else
# define  __USE_XOPEN_EXTENDED
# include <ftw.h>
# ifdef __dietlibc__
#  define FTW_PHYS 1
# endif
#endif

extern int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s);


extern int Manage_ro(char *devname, int fd, int readonly);
extern int Manage_runstop(char *devname, int fd, int runstop, int quiet);
extern int Manage_resize(char *devname, int fd, long long size, int raid_disks);
extern int Manage_reconfig(char *devname, int fd, int layout);
extern int Manage_subdevs(char *devname, int fd,
			  mddev_dev_t devlist, int verbose);
extern int Grow_Add_device(char *devname, int fd, char *newdev);
extern int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int write_behind, int force);


extern int Assemble(struct supertype *st, char *mddev, int mdfd,
		    mddev_ident_t ident,
		    char *conffile,
		    mddev_dev_t devlist,
		    int readonly, int runstop,
		    char *update,
		    int verbose, int force);

extern int Build(char *mddev, int mdfd, int chunk, int level, int layout,
		 int raiddisks,
		 mddev_dev_t devlist, int assume_clean,
		 char *bitmap_file, int bitmap_chunk, int write_behind, int delay, int verbose);


extern int Create(struct supertype *st, char *mddev, int mdfd,
		  int chunk, int level, int layout, unsigned long long size, int raiddisks, int sparedisks,
		  char *name,
		  int subdevs, mddev_dev_t devlist,
		  int runstop, int verbose, int force, int assume_clean,
		  char *bitmap_file, int bitmap_chunk, int write_behind, int delay);

extern int Detail(char *dev, int brief, int test);
extern int Query(char *dev);
extern int Examine(mddev_dev_t devlist, int brief, int scan, int SparcAdjust,
		   struct supertype *forcest);
extern int Monitor(mddev_dev_t devlist,
		   char *mailaddr, char *alert_cmd,
		   int period, int daemonise, int scan, int oneshot,
		   int dosyslog, char *config, int test, char *pidfile);

extern int Kill(char *dev, int force);

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 md_get_version(int fd);
extern int get_linux_version(void);
extern int parse_uuid(char *str, int uuid[4]);
extern int check_ext2(int fd, char *name);
extern int check_reiser(int fd, char *name);
extern int check_raid(int fd, char *name);

extern int get_mdp_major(void);
extern int dev_open(char *dev, int flags);
extern int is_standard(char *dev, int *nump);


extern mddev_ident_t conf_get_ident(char *conffile, char *dev);
extern mddev_dev_t conf_get_devs(char *conffile);
extern char *conf_get_mailaddr(char *conffile);
extern char *conf_get_program(char *conffile);
extern char *conf_line(FILE *file);
extern char *conf_word(FILE *file, int allow_key);
extern void free_line(char *line);
extern int match_oneof(char *devices, char *devname);
extern void uuid_from_super(int uuid[4], mdp_super_t *super);
extern int same_uuid(int a[4], int b[4], int swapuuid);
/* extern int compare_super(mdp_super_t *first, mdp_super_t *second);*/
extern unsigned long calc_csum(void *super, int bytes);
extern int enough(int level, int raid_disks, int layout,
		   char *avail, int avail_disks);
extern int ask(char *mesg);
extern unsigned long long get_component_size(int fd);


extern char *human_size(long long bytes);
char *human_size_brief(long long bytes);

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

extern char DefaultConfFile[];

extern int open_mddev(char *dev, int autof);


#define	LEVEL_MULTIPATH		(-4)
#define	LEVEL_LINEAR		(-1)
#define	LEVEL_FAULTY		(-5)


/* faulty stuff */

#define	WriteTransient	0
#define	ReadTransient	1
#define	WritePersistent	2
#define	ReadPersistent	3
#define	WriteAll	4 /* doesn't go to device */
#define	ReadFixable	5
#define	Modes	6

#define	ClearErrors	31
#define	ClearFaults	30

#define AllPersist	100 /* internal use only */
#define	NoPersist	101

#define	ModeMask	0x1f
#define	ModeShift	5


#ifdef __TINYC__
#undef minor
#undef major
#undef makedev
#define minor(x) ((x)&0xff)
#define major(x) (((x)>>8)&0xff)
#define makedev(M,m) (((M)<<8) | (m))
#endif
Commit	Line	Data
	1	/*
	2	* mdadm - manage Linux "md" devices aka RAID arrays.
	3	*
	4	* Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au>
	5	*
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*
	21	* Author: Neil Brown
	22	* Email: <neilb@cse.unsw.edu.au>
	23	* Paper: Neil Brown
	24	* School of Computer Science and Engineering
	25	* The University of New South Wales
	26	* Sydney, 2052
	27	* Australia
	28	*/
	29
	30	#define __USE_LARGEFILE64
	31	#include <unistd.h>
	32	#ifndef __dietlibc__
	33	extern __off64_t lseek64 __P ((int __fd, __off64_t __offset, int __whence));
	34	#endif
	35
	36	#include <sys/types.h>
	37	#include <sys/stat.h>
	38	#include <stdlib.h>
	39	#include <time.h>
	40	#include <sys/time.h>
	41	#include <getopt.h>
	42	#include <fcntl.h>
	43	#include <stdio.h>
	44	#include <errno.h>
	45	#include <string.h>
	46	#include <syslog.h>
	47	#ifdef __dietlibc__NONO
	48	int strncmp(const char s1, const char s2, size_t n) __THROW __pure__;
	49	char strncpy(char dest, const char *src, size_t n) __THROW;
	50	#include <strings.h>
	51	#endif
	52
	53
	54	#include <linux/kdev_t.h>
	55	/#include <linux/fs.h> /
	56	#include <sys/mount.h>
	57	#include <asm/types.h>
	58	#include <sys/ioctl.h>
	59	#define MD_MAJOR 9
	60	#define MdpMinorShift 6
	61
	62	#ifndef BLKGETSIZE64
	63	#define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 arg) /
	64	#endif
	65
	66	#define DEFAULT_BITMAP_CHUNK 4096
	67	#define DEFAULT_BITMAP_DELAY 5
	68	#define DEFAULT_MAX_WRITE_BEHIND 256
	69
	70	#include "md_u.h"
	71	#include "md_p.h"
	72	#include "bitmap.h"
	73
	74	#include <endian.h>
	75	/* #include "asm/byteorder.h" Redhat don't like this so... */
	76	#if __BYTE_ORDER == __LITTLE_ENDIAN
	77	# include <linux/byteorder/little_endian.h>
	78	#elif __BYTE_ORDER == __BIG_ENDIAN
	79	# include <linux/byteorder/big_endian.h>
	80	#elif __BYTE_ORDER == __PDP_ENDIAN
	81	# include <linux/byteorder/pdp_endian.h>
	82	#else
	83	# error "unknown endianness."
	84	#endif
	85
	86
	87
	88	/* general information that might be extracted from a superblock */
	89	struct mdinfo {
	90	mdu_array_info_t array;
	91	mdu_disk_info_t disk;
	92	__u64 events;
	93	int uuid[4];
	94	};
	95
	96	#define Name "mdadm"
	97
	98	enum mode {
	99	ASSEMBLE=1,
	100	BUILD,
	101	CREATE,
	102	MANAGE,
	103	MISC,
	104	MONITOR,
	105	GROW,
	106	};
	107
	108	extern char short_options[];
	109	extern char short_bitmap_auto_options[];
	110	extern struct option long_options[];
	111	extern char Version[], Usage[], Help[], OptionHelp[],
	112	Help_create[], Help_build[], Help_assemble[], Help_grow[],
	113	Help_manage[], Help_misc[], Help_monitor[], Help_config[];
	114
	115	/* structures read from config file */
	116	/* List of mddevice names and identifiers
	117	* Identifiers can be:
	118	* uuid=128-hex-uuid
	119	* super-minor=decimal-minor-number-from-superblock
	120	* devices=comma,separated,list,of,device,names,with,wildcards
	121	*
	122	* If multiple fields are present, the intersection of all matching
	123	* devices is considered
	124	*/
	125	#define UnSet (0xfffe)
	126	typedef struct mddev_ident_s {
	127	char *devname;
	128
	129	int uuid_set;
	130	int uuid[4];
	131	char name[33];
	132
	133	unsigned int super_minor;
	134
	135	char devices; / comma separated list of device
	136	* names with wild cards
	137	*/
	138	int level;
	139	unsigned int raid_disks;
	140	unsigned int spare_disks;
	141	struct supertype *st;
	142	int autof; /* 1 for normal, 2 for partitioned */
	143	char *spare_group;
	144	int bitmap_fd;
	145
	146	struct mddev_ident_s *next;
	147	} *mddev_ident_t;
	148
	149	/* List of device names - wildcards expanded */
	150	typedef struct mddev_dev_s {
	151	char *devname;
	152	char disposition; /* 'a' for add, 'r' for remove, 'f' for fail.
	153	* Not set for names read from .config
	154	*/
	155	char writemostly;
	156	char re_add;
	157	struct mddev_dev_s *next;
	158	} *mddev_dev_t;
	159
	160	typedef struct mapping {
	161	char *name;
	162	int num;
	163	} mapping_t;
	164
	165
	166	struct mdstat_ent {
	167	char *dev;
	168	int devnum;
	169	int active;
	170	char *level;
	171	char pattern; / U or up, _ for down */
	172	int percent; /* -1 if no resync */
	173	int resync; /* 1 if resync, 0 if recovery */
	174	struct mdstat_ent *next;
	175	};
	176
	177	extern struct mdstat_ent *mdstat_read(int hold, int start);
	178	extern void free_mdstat(struct mdstat_ent *ms);
	179	extern void mdstat_wait(int seconds);
	180
	181	#ifndef Sendmail
	182	#define Sendmail "/usr/lib/sendmail -t"
	183	#endif
	184
	185	#define SYSLOG_FACILITY LOG_DAEMON
	186
	187	extern char map_num(mapping_t map, int num);
	188	extern int map_name(mapping_t map, char name);
	189	extern mapping_t r5layout[], pers[], modes[], faultylayout[];
	190
	191	extern char *map_dev(int major, int minor);
	192
	193
	194	extern struct superswitch {
	195	void (examine_super)(void sbv);
	196	void (brief_examine_super)(void sbv);
	197	void (detail_super)(void sbv);
	198	void (brief_detail_super)(void sbv);
	199	void (uuid_from_super)(int uuid[4], void sbv);
	200	void (getinfo_super)(struct mdinfo info, mddev_ident_t ident, void *sbv);
	201	int (update_super)(struct mdinfo info, void sbv, char update, char *devname, int verbose);
	202	__u64 (event_super)(void sbv);
	203	int (init_super)(struct supertype st, void *sbp, mdu_array_info_t info, unsigned long long size, char *name);
	204	void (add_to_super)(void sbv, mdu_disk_info_t *dinfo);
	205	int (store_super)(struct supertype st, int fd, void *sbv);
	206	int (write_init_super)(struct supertype st, void sbv, mdu_disk_info_t dinfo, char *devname);
	207	int (compare_super)(void firstp, void secondv);
	208	int (load_super)(struct supertype st, int fd, void *sbp, char devname);
	209	struct supertype * (match_metadata_desc)(char arg);
	210	__u64 (avail_size)(struct supertype st, __u64 size);
	211	int (add_internal_bitmap)(struct supertype st, void *sbv, int chunk, int delay, int write_behind,
	212	unsigned long long size, int may_change, int major);
	213	void (locate_bitmap)(struct supertype st, int fd, void *sbv);
	214	int (write_bitmap)(struct supertype st, int fd, void *sbv);
	215	int major;
	216	int swapuuid; /* true if uuid is bigending rather than hostendian */
	217	} super0, super1, *superlist[];
	218
	219	struct supertype {
	220	struct superswitch *ss;
	221	int minor_version;
	222	int max_devs;
	223	};
	224
	225	extern struct supertype *super_by_version(int vers, int minor);
	226	extern struct supertype *guess_super(int fd);
	227
	228	#if __GNUC__ < 3
	229	struct stat64;
	230	#endif
	231
	232	#ifdef UCLIBC
	233	struct FTW {};
	234	# define FTW_PHYS 1
	235	#else
	236	# define __USE_XOPEN_EXTENDED
	237	# include <ftw.h>
	238	# ifdef __dietlibc__
	239	# define FTW_PHYS 1
	240	# endif
	241	#endif
	242
	243	extern int add_dev(const char name, const struct stat stb, int flag, struct FTW *s);
	244
	245
	246	extern int Manage_ro(char *devname, int fd, int readonly);
	247	extern int Manage_runstop(char *devname, int fd, int runstop, int quiet);
	248	extern int Manage_resize(char *devname, int fd, long long size, int raid_disks);
	249	extern int Manage_reconfig(char *devname, int fd, int layout);
	250	extern int Manage_subdevs(char *devname, int fd,
	251	mddev_dev_t devlist, int verbose);
	252	extern int Grow_Add_device(char devname, int fd, char newdev);
	253	extern int Grow_addbitmap(char devname, int fd, char file, int chunk, int delay, int write_behind, int force);
	254
	255
	256	extern int Assemble(struct supertype st, char mddev, int mdfd,
	257	mddev_ident_t ident,
	258	char *conffile,
	259	mddev_dev_t devlist,
	260	int readonly, int runstop,
	261	char *update,
	262	int verbose, int force);
	263
	264	extern int Build(char *mddev, int mdfd, int chunk, int level, int layout,
	265	int raiddisks,
	266	mddev_dev_t devlist, int assume_clean,
	267	char *bitmap_file, int bitmap_chunk, int write_behind, int delay, int verbose);
	268
	269
	270	extern int Create(struct supertype st, char mddev, int mdfd,
	271	int chunk, int level, int layout, unsigned long long size, int raiddisks, int sparedisks,
	272	char *name,
	273	int subdevs, mddev_dev_t devlist,
	274	int runstop, int verbose, int force, int assume_clean,
	275	char *bitmap_file, int bitmap_chunk, int write_behind, int delay);
	276
	277	extern int Detail(char *dev, int brief, int test);
	278	extern int Query(char *dev);
	279	extern int Examine(mddev_dev_t devlist, int brief, int scan, int SparcAdjust,
	280	struct supertype *forcest);
	281	extern int Monitor(mddev_dev_t devlist,
	282	char mailaddr, char alert_cmd,
	283	int period, int daemonise, int scan, int oneshot,
	284	int dosyslog, char config, int test, char pidfile);
	285
	286	extern int Kill(char *dev, int force);
	287
	288	extern int CreateBitmap(char *filename, int force, char uuid[16],
	289	unsigned long chunksize, unsigned long daemon_sleep,
	290	unsigned long write_behind,
	291	unsigned long long array_size,
	292	int major);
	293	extern int ExamineBitmap(char filename, int brief, struct supertype st);
	294
	295	extern int md_get_version(int fd);
	296	extern int get_linux_version(void);
	297	extern int parse_uuid(char *str, int uuid[4]);
	298	extern int check_ext2(int fd, char *name);
	299	extern int check_reiser(int fd, char *name);
	300	extern int check_raid(int fd, char *name);
	301
	302	extern int get_mdp_major(void);
	303	extern int dev_open(char *dev, int flags);
	304	extern int is_standard(char dev, int nump);
	305
	306
	307	extern mddev_ident_t conf_get_ident(char conffile, char dev);
	308	extern mddev_dev_t conf_get_devs(char *conffile);
	309	extern char conf_get_mailaddr(char conffile);
	310	extern char conf_get_program(char conffile);
	311	extern char conf_line(FILE file);
	312	extern char conf_word(FILE file, int allow_key);
	313	extern void free_line(char *line);
	314	extern int match_oneof(char devices, char devname);
	315	extern void uuid_from_super(int uuid[4], mdp_super_t *super);
	316	extern int same_uuid(int a[4], int b[4], int swapuuid);
	317	/* extern int compare_super(mdp_super_t first, mdp_super_t second);*/
	318	extern unsigned long calc_csum(void *super, int bytes);
	319	extern int enough(int level, int raid_disks, int layout,
	320	char *avail, int avail_disks);
	321	extern int ask(char *mesg);
	322	extern unsigned long long get_component_size(int fd);
	323
	324
	325	extern char *human_size(long long bytes);
	326	char *human_size_brief(long long bytes);
	327
	328	extern void put_md_name(char *name);
	329	extern char *get_md_name(int dev);
	330
	331	extern char DefaultConfFile[];
	332
	333	extern int open_mddev(char *dev, int autof);
	334
	335
	336	#define LEVEL_MULTIPATH (-4)
	337	#define LEVEL_LINEAR (-1)
	338	#define LEVEL_FAULTY (-5)
	339
	340
	341	/* faulty stuff */
	342
	343	#define WriteTransient 0
	344	#define ReadTransient 1
	345	#define WritePersistent 2
	346	#define ReadPersistent 3
	347	#define WriteAll 4 /* doesn't go to device */
	348	#define ReadFixable 5
	349	#define Modes 6
	350
	351	#define ClearErrors 31
	352	#define ClearFaults 30
	353
	354	#define AllPersist 100 /* internal use only */
	355	#define NoPersist 101
	356
	357	#define ModeMask 0x1f
	358	#define ModeShift 5
	359
	360
	361	#ifdef __TINYC__
	362	#undef minor
	363	#undef major
	364	#undef makedev
	365	#define minor(x) ((x)&0xff)
	366	#define major(x) (((x)>>8)&0xff)
	367	#define makedev(M,m) (((M)<<8) \| (m))
	368	#endif
	369