Adding upstream version 4.2.upstream/4.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1887 insertions, 0 deletions

diff --git a/mdadm.h b/mdadm.h
new file mode 100644
index 0000000..c7268a7
--- /dev/null
+++ b/mdadm.h
@@ -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