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authorYann Soubeyrand <yann-externe.soubeyrand@edf.fr>2015-11-10 10:18:39 +0000
committerYann Soubeyrand <yann-externe.soubeyrand@edf.fr>2015-11-10 10:18:39 +0000
commit910e28f2b4651d0e8533c577d3bc65338cea69f8 (patch)
treefdca1d7c60e15fb527a171285d8917f68699f64a /mdadm.h
mdadm (3.3.4-1.1) unstable; urgency=medium
* Non-maintainer upload. * disable-incremental-assembly.patch: incremental assembly prevents booting in degraded mode (Closes: #784070) # imported from the archive
Diffstat (limited to 'mdadm.h')
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diff --git a/mdadm.h b/mdadm.h
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+/*
+ * 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 <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_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 */
+
+#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) (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) 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) (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__ */
+
+/*
+ * 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[];
+
+/* 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
+ */
+ /* 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 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[20];
+ struct mdinfo *devs;
+ struct mdinfo *next;
+
+ /* Device info for mdmon: */
+ int recovery_fd;
+ 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;
+ int names;
+ int bblist;
+ struct supertype *supertype;
+};
+
+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,
+ ManageOpt,
+ Add,
+ AddSpare,
+ Remove,
+ Fail,
+ Replace,
+ With,
+ MiscOpt,
+ WaitOpt,
+ ConfigFile,
+ ChunkSize,
+ WriteMostly,
+ Layout,
+ Auto,
+ Force,
+ SuperMinor,
+ EMail,
+ ProgramOpt,
+ Increment,
+ Fork,
+ Bitmap,
+ RebuildMapOpt,
+ InvalidBackup,
+ UdevRules,
+ FreezeReshape,
+ Continue,
+ OffRootOpt,
+ Prefer,
+ KillOpt,
+ DataOffset,
+ ExamineBB,
+ Dump,
+ Restore,
+ Action,
+};
+
+enum prefix_standard {
+ JEDEC,
+ IEC
+};
+
+/* 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 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;
+};
+
+struct shape {
+ int raiddisks;
+ int sparedisks;
+ 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;
+};
+
+/* 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
+ */
+ char writemostly; /* 1 for 'set writemostly', 2 for 'clear writemostly' */
+ 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 or 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 void 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_DEGRADED = (1 << 8),
+ 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),
+};
+
+/* If fd >= 0, get the array it is open on,
+ * else use devnm.
+ */
+extern int sysfs_open(char *devnm, char *devname, char *attr);
+extern void sysfs_init(struct mdinfo *mdi, int fd, char *devnm);
+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);
+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 r5layout[], r6layout[], pers[], modes[], faultylayout[];
+
+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);
+}
+
+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 the 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);
+ void (*brief_detail_super)(struct supertype *st);
+ 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
+ * no-bitmap - clear any record that a bitmap is present.
+ * bbl - add a bad-block-log if possible
+ * no-bbl - remove and bad-block-log is it is 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,
+ unsigned long long size, 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);
+ /* 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);
+ /* This is similar to 'avail_size' in purpose, but is used for
+ * containers for which there is no 'component size' to compare.
+ * This reports that whole-device size which is a minimum
+ */
+ unsigned long long (*min_acceptable_spare_size)(struct supertype *st);
+ /* 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.
+ */
+ int (*add_internal_bitmap)(struct supertype *st, int *chunkp,
+ int delay, int write_behind,
+ unsigned long long size, int may_change, int major);
+ /* Seek 'fd' to start of write-intent-bitmap. Must be an
+ * md-native format bitmap
+ */
+ void (*locate_bitmap)(struct supertype *st, int fd);
+ /* if add_internal_bitmap succeeded for existing array, this
+ * writes it out.
+ */
+ int (*write_bitmap)(struct supertype *st, int fd);
+ /* 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 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); /* 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,
+ 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);
+ /* 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);
+
+ 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;
+
+ 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 must_be_container(int fd);
+extern int dev_size_from_id(dev_t id, unsigned long long *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 *path, 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);
+
+#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 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 sock, 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 Write_rules(char *rule_name);
+extern int bitmap_update_uuid(int fd, int *uuid, int swap);
+extern unsigned long bitmap_sectors(struct bitmap_super_s *bsb);
+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);
+
+extern int md_get_version(int fd);
+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 parse_layout_10(char *layout);
+extern int parse_layout_faulty(char *layout);
+extern long parse_num(char *num);
+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 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 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_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 int experimental(void);
+
+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 enough_fd(int fd);
+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,
+ unsigned long long min_size,
+ 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 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(int devid);
+extern char *devid2devnm(int devid);
+extern int 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);
+/* 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 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 void fmt_devname(char *name, int num);
+extern char *stat2devnm(struct stat *st);
+extern char *fd2devnm(int fd);
+
+extern int in_initrd(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
+
+/* 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_UNKNOWN -4
+
+/* 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