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mdadm.h
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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]))
/* 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;
struct supertype *supertype;
};
#define Name "mdadm"
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,
};
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;
};
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 *dev;
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]);
#ifdef MDASSEMBLE
static inline struct map_ent *map_by_devnm(struct map_ent **map, char *name)
{
return NULL;
}
static inline void map_free(struct map_ent *map)
{
}
#else
extern struct map_ent *map_by_devnm(struct map_ent **map, char *devnm);
extern void map_free(struct map_ent *map);
#endif
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,
int restart);
extern unsigned long compute_backup_blocks(int nchunk, int ochunk,
unsigned int ndata, unsigned int odata);
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);
void (*prepare_update)(struct supertype *st,
struct metadata_update *update);
/* activate_spare will check if the array is degraded and, if it
* is, try to find some spare space in the container.
* On success, it add appropriate updates (For process_update) to
* to the 'updates' list and returns a list of 'mdinfo' identifying
* the device, or devices as there might be multiple missing
* devices and multiple spares available.
*/
struct mdinfo *(*activate_spare)(struct active_array *a,
struct metadata_update **updates);
/*
* 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);
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;