2 * mdadm - manage Linux "md" devices aka RAID arrays.
4 * Copyright (C) 2001-2009 Neil Brown <neilb@suse.de>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * Email: <neilb@suse.de>
26 #define _FILE_OFFSET_BITS 64
29 extern __off64_t lseek64
__P ((int __fd
, __off64_t __offset
, int __whence
));
30 #elif !defined(lseek64)
31 # if defined(__NO_STAT64) || __WORDSIZE != 32
32 # define lseek64 lseek
36 #include <sys/types.h>
49 /* dietlibc has deprecated random and srandom!! */
54 #include <linux/kdev_t.h>
55 /*#include <linux/fs.h> */
56 #include <sys/mount.h>
57 #include <asm/types.h>
58 #include <sys/ioctl.h>
60 #define MdpMinorShift 6
63 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
66 #define DEFAULT_CHUNK 512
67 #define DEFAULT_BITMAP_CHUNK 4096
68 #define DEFAULT_BITMAP_DELAY 5
69 #define DEFAULT_MAX_WRITE_BEHIND 256
71 /* MAP_DIR should be somewhere that persists across the pivotroot
72 * from early boot to late boot.
73 * /run seems to have emerged as the best standard.
76 #define MAP_DIR "/run/mdadm"
78 /* MAP_FILE is what we name the map file we put in MAP_DIR, in case you
79 * want something other than the default of "map"
82 #define MAP_FILE "map"
84 /* MDMON_DIR is where pid and socket files used for communicating
85 * with mdmon normally live. Best is /var/run/mdadm as
86 * mdmon is needed at early boot then it needs to write there prior
87 * to /var/run being mounted read/write, and it also then needs to
88 * persist beyond when /var/run is mounter read-only. So, to be
89 * safe, the default is somewhere that is read/write early in the
90 * boot process and stays up as long as possible during shutdown.
93 #define MDMON_DIR "/run/mdadm"
94 #endif /* MDMON_DIR */
96 /* FAILED_SLOTS is where to save files storing recent removal of array
97 * member in order to allow future reuse of disk inserted in the same
98 * slot for array recovery
100 #ifndef FAILED_SLOTS_DIR
101 #define FAILED_SLOTS_DIR "/run/mdadm/failed-slots"
102 #endif /* FAILED_SLOTS */
110 /* Redhat don't like to #include <asm/byteorder.h>, and
111 * some time include <linux/byteorder/xxx_endian.h> isn't enough,
112 * and there is no standard conversion function so... */
113 /* And dietlibc doesn't think byteswap is ok, so.. */
114 /* #include <byteswap.h> */
115 #define bswap_16(x) (((x) & 0x00ffU) << 8 | \
116 ((x) & 0xff00U) >> 8)
117 #define bswap_32(x) (((x) & 0x000000ffU) << 24 | \
118 ((x) & 0xff000000U) >> 24 | \
119 ((x) & 0x0000ff00U) << 8 | \
120 ((x) & 0x00ff0000U) >> 8)
121 #define bswap_64(x) (((x) & 0x00000000000000ffULL) << 56 | \
122 ((x) & 0xff00000000000000ULL) >> 56 | \
123 ((x) & 0x000000000000ff00ULL) << 40 | \
124 ((x) & 0x00ff000000000000ULL) >> 40 | \
125 ((x) & 0x0000000000ff0000ULL) << 24 | \
126 ((x) & 0x0000ff0000000000ULL) >> 24 | \
127 ((x) & 0x00000000ff000000ULL) << 8 | \
128 ((x) & 0x000000ff00000000ULL) >> 8)
130 #if !defined(__KLIBC__)
131 #if BYTE_ORDER == LITTLE_ENDIAN
132 #define __cpu_to_le16(_x) (_x)
133 #define __cpu_to_le32(_x) (_x)
134 #define __cpu_to_le64(_x) (_x)
135 #define __le16_to_cpu(_x) (_x)
136 #define __le32_to_cpu(_x) (_x)
137 #define __le64_to_cpu(_x) (_x)
139 #define __cpu_to_be16(_x) bswap_16(_x)
140 #define __cpu_to_be32(_x) bswap_32(_x)
141 #define __cpu_to_be64(_x) bswap_64(_x)
142 #define __be16_to_cpu(_x) bswap_16(_x)
143 #define __be32_to_cpu(_x) bswap_32(_x)
144 #define __be64_to_cpu(_x) bswap_64(_x)
145 #elif BYTE_ORDER == BIG_ENDIAN
146 #define __cpu_to_le16(_x) bswap_16(_x)
147 #define __cpu_to_le32(_x) bswap_32(_x)
148 #define __cpu_to_le64(_x) bswap_64(_x)
149 #define __le16_to_cpu(_x) bswap_16(_x)
150 #define __le32_to_cpu(_x) bswap_32(_x)
151 #define __le64_to_cpu(_x) bswap_64(_x)
153 #define __cpu_to_be16(_x) (_x)
154 #define __cpu_to_be32(_x) (_x)
155 #define __cpu_to_be64(_x) (_x)
156 #define __be16_to_cpu(_x) (_x)
157 #define __be32_to_cpu(_x) (_x)
158 #define __be64_to_cpu(_x) (_x)
160 # error "unknown endianness."
162 #endif /* __KLIBC__ */
165 * min()/max()/clamp() macros that also do
166 * strict type-checking.. See the
167 * "unnecessary" pointer comparison.
169 #define min(x, y) ({ \
170 typeof(x) _min1 = (x); \
171 typeof(y) _min2 = (y); \
172 (void) (&_min1 == &_min2); \
173 _min1 < _min2 ? _min1 : _min2; })
175 #define max(x, y) ({ \
176 typeof(x) _max1 = (x); \
177 typeof(y) _max2 = (y); \
178 (void) (&_max1 == &_max2); \
179 _max1 > _max2 ? _max1 : _max2; })
181 /* general information that might be extracted from a superblock */
183 mdu_array_info_t array
;
184 mdu_disk_info_t disk
;
188 unsigned long long data_offset
;
189 unsigned long long new_data_offset
;
190 unsigned long long component_size
; /* same as array.size, except in
191 * sectors and up to 64bits.
193 unsigned long long custom_array_size
; /* size for non-default sized
194 * arrays (in sectors)
197 #define VOLUME_RESHAPE 1
198 #define CONTAINER_RESHAPE 2
199 #define RESHAPE_NO_BACKUP 16 /* Mask 'or'ed in */
201 unsigned long long reshape_progress
;
202 int recovery_blocked
; /* for external metadata it
203 * indicates that there is
204 * reshape in progress in
206 * for native metadata it is
207 * reshape_active field mirror
209 /* During reshape we can sometimes change the data_offset to avoid
210 * over-writing still-valid data. We need to know if there is space.
211 * So getinfo_super will fill in space_before and space_after in sectors.
212 * data_offset can be increased or decreased by this amount.
214 unsigned long long space_before
, space_after
;
216 unsigned long long resync_start
; /* per-array resync position */
217 unsigned long long recovery_start
; /* per-device rebuild position */
218 #define MaxSector (~0ULL) /* resync/recovery complete position */
220 long bitmap_offset
; /* 0 == none, 1 == a file */
221 unsigned long safe_mode_delay
; /* ms delay to mark clean */
222 int new_level
, delta_disks
, new_layout
, new_chunk
;
224 unsigned long cache_size
; /* size of raid456 stripe cache*/
226 char text_version
[50];
228 int container_member
; /* for assembling external-metatdata arrays
229 * This is to be used internally by metadata
231 int container_enough
; /* flag external handlers can set to
232 * indicate that subarrays have not enough (-1),
233 * enough to start (0), or all expected disks (1) */
238 /* Device info for mdmon: */
243 #define DS_WRITE_MOSTLY 4
245 #define DS_BLOCKED 16
246 #define DS_REMOVE 1024
247 #define DS_UNBLOCK 2048
248 int prev_state
, curr_state
, next_state
;
259 struct supertype
*supertype
;
277 extern char short_options
[];
278 extern char short_bitmap_options
[];
279 extern char short_bitmap_auto_options
[];
280 extern struct option long_options
[];
281 extern char Version
[], Usage
[], Help
[], OptionHelp
[],
283 Help_create
[], Help_build
[], Help_assemble
[], Help_grow
[],
285 Help_manage
[], Help_misc
[], Help_monitor
[], Help_config
[];
287 /* for option that don't have short equivilents, we assign arbitrary
288 * numbers later than any 'short' character option.
290 enum special_options
{
344 enum prefix_standard
{
349 /* structures read from config file */
350 /* List of mddevice names and identifiers
351 * Identifiers can be:
353 * super-minor=decimal-minor-number-from-superblock
354 * devices=comma,separated,list,of,device,names,with,wildcards
356 * If multiple fields are present, the intersection of all matching
357 * devices is considered
359 #define UnSet (0xfffe)
369 char *devices
; /* comma separated list of device
370 * names with wild cards
375 struct supertype
*st
;
376 int autof
; /* 1 for normal, 2 for partitioned */
381 char *container
; /* /dev/whatever name of container, or
382 * uuid of container. You would expect
383 * this to be the 'devname' or UUID
384 * of some other entry.
386 char *member
; /* subarray within a container */
388 struct mddev_ident
*next
;
390 /* fields needed by different users of this structure */
391 int assembled
; /* set when assembly succeeds */
402 int require_homehost
;
428 unsigned long long size
;
431 /* List of device names - wildcards expanded */
434 int disposition
; /* 'a' for add, 'r' for remove, 'f' for fail,
436 * Not set for names read from .config
438 char writemostly
; /* 1 for 'set writemostly', 2 for 'clear writemostly' */
439 int used
; /* set when used */
440 long long data_offset
;
441 struct mddev_dev
*next
;
444 typedef struct mapping
{
454 char *pattern
; /* U or up, _ for down */
455 int percent
; /* -1 if no resync */
456 int resync
; /* 3 if check, 2 if reshape, 1 if resync, 0 if recovery */
459 char * metadata_version
;
462 struct dev_member
*next
;
464 struct mdstat_ent
*next
;
467 extern struct mdstat_ent
*mdstat_read(int hold
, int start
);
468 extern void free_mdstat(struct mdstat_ent
*ms
);
469 extern void mdstat_wait(int seconds
);
470 extern void mdstat_wait_fd(int fd
, const sigset_t
*sigmask
);
471 extern int mddev_busy(char *devnm
);
472 extern struct mdstat_ent
*mdstat_by_component(char *name
);
473 extern struct mdstat_ent
*mdstat_by_subdev(char *subdev
, char *container
);
476 struct map_ent
*next
;
483 extern int map_update(struct map_ent
**mpp
, char *devnm
, char *metadata
,
484 int uuid
[4], char *path
);
485 extern void map_remove(struct map_ent
**map
, char *devnm
);
486 extern struct map_ent
*map_by_uuid(struct map_ent
**map
, int uuid
[4]);
487 extern struct map_ent
*map_by_devnm(struct map_ent
**map
, char *devnm
);
488 extern struct map_ent
*map_by_name(struct map_ent
**map
, char *name
);
489 extern void map_read(struct map_ent
**melp
);
490 extern int map_write(struct map_ent
*mel
);
491 extern void map_delete(struct map_ent
**mapp
, char *devnm
);
492 extern void map_free(struct map_ent
*map
);
493 extern void map_add(struct map_ent
**melp
,
494 char *devnm
, char *metadata
, int uuid
[4], char *path
);
495 extern int map_lock(struct map_ent
**melp
);
496 extern void map_unlock(struct map_ent
**melp
);
497 extern void map_fork(void);
499 /* various details can be requested */
500 enum sysfs_read_flags
{
501 GET_LEVEL
= (1 << 0),
502 GET_LAYOUT
= (1 << 1),
503 GET_COMPONENT
= (1 << 2),
504 GET_CHUNK
= (1 << 3),
505 GET_CACHE
= (1 << 4),
506 GET_MISMATCH
= (1 << 5),
507 GET_VERSION
= (1 << 6),
508 GET_DISKS
= (1 << 7),
509 GET_DEGRADED
= (1 << 8),
510 GET_SAFEMODE
= (1 << 9),
511 GET_BITMAP_LOCATION
= (1 << 10),
513 GET_DEVS
= (1 << 20), /* gets role, major, minor */
514 GET_OFFSET
= (1 << 21),
515 GET_SIZE
= (1 << 22),
516 GET_STATE
= (1 << 23),
517 GET_ERROR
= (1 << 24),
520 /* If fd >= 0, get the array it is open on,
523 extern int sysfs_open(char *devnm
, char *devname
, char *attr
);
524 extern void sysfs_init(struct mdinfo
*mdi
, int fd
, char *devnm
);
525 extern void sysfs_free(struct mdinfo
*sra
);
526 extern struct mdinfo
*sysfs_read(int fd
, char *devnm
, unsigned long options
);
527 extern int sysfs_attr_match(const char *attr
, const char *str
);
528 extern int sysfs_match_word(const char *word
, char **list
);
529 extern int sysfs_set_str(struct mdinfo
*sra
, struct mdinfo
*dev
,
530 char *name
, char *val
);
531 extern int sysfs_set_num(struct mdinfo
*sra
, struct mdinfo
*dev
,
532 char *name
, unsigned long long val
);
533 extern int sysfs_set_num_signed(struct mdinfo
*sra
, struct mdinfo
*dev
,
534 char *name
, long long val
);
535 extern int sysfs_uevent(struct mdinfo
*sra
, char *event
);
536 extern int sysfs_get_fd(struct mdinfo
*sra
, struct mdinfo
*dev
,
538 extern int sysfs_fd_get_ll(int fd
, unsigned long long *val
);
539 extern int sysfs_get_ll(struct mdinfo
*sra
, struct mdinfo
*dev
,
540 char *name
, unsigned long long *val
);
541 extern int sysfs_fd_get_two(int fd
, unsigned long long *v1
, unsigned long long *v2
);
542 extern int sysfs_get_two(struct mdinfo
*sra
, struct mdinfo
*dev
,
543 char *name
, unsigned long long *v1
, unsigned long long *v2
);
544 extern int sysfs_fd_get_str(int fd
, char *val
, int size
);
545 extern int sysfs_attribute_available(struct mdinfo
*sra
, struct mdinfo
*dev
,
547 extern int sysfs_get_str(struct mdinfo
*sra
, struct mdinfo
*dev
,
548 char *name
, char *val
, int size
);
549 extern int sysfs_set_safemode(struct mdinfo
*sra
, unsigned long ms
);
550 extern int sysfs_set_array(struct mdinfo
*info
, int vers
);
551 extern int sysfs_add_disk(struct mdinfo
*sra
, struct mdinfo
*sd
, int resume
);
552 extern int sysfs_disk_to_scsi_id(int fd
, __u32
*id
);
553 extern int sysfs_unique_holder(char *devnm
, long rdev
);
554 extern int sysfs_freeze_array(struct mdinfo
*sra
);
555 extern int sysfs_wait(int fd
, int *msec
);
556 extern int load_sys(char *path
, char *buf
);
557 extern int reshape_prepare_fdlist(char *devname
,
561 unsigned long blocks
,
564 unsigned long long *offsets
);
565 extern void reshape_free_fdlist(int *fdlist
,
566 unsigned long long *offsets
,
568 extern int reshape_open_backup_file(char *backup
,
573 unsigned long long *offsets
,
575 extern unsigned long compute_backup_blocks(int nchunk
, int ochunk
,
576 unsigned int ndata
, unsigned int odata
);
578 extern int save_stripes(int *source
, unsigned long long *offsets
,
579 int raid_disks
, int chunk_size
, int level
, int layout
,
580 int nwrites
, int *dest
,
581 unsigned long long start
, unsigned long long length
,
583 extern int restore_stripes(int *dest
, unsigned long long *offsets
,
584 int raid_disks
, int chunk_size
, int level
, int layout
,
585 int source
, unsigned long long read_offset
,
586 unsigned long long start
, unsigned long long length
,
590 #define Sendmail "/usr/lib/sendmail -t"
593 #define SYSLOG_FACILITY LOG_DAEMON
595 extern char *map_num(mapping_t
*map
, int num
);
596 extern int map_name(mapping_t
*map
, char *name
);
597 extern mapping_t r5layout
[], r6layout
[], pers
[], modes
[], faultylayout
[];
599 extern char *map_dev_preferred(int major
, int minor
, int create
,
601 static inline char *map_dev(int major
, int minor
, int create
)
603 return map_dev_preferred(major
, minor
, create
, NULL
);
607 struct metadata_update
;
609 /* 'struct reshape' records the intermediate states of
611 * The starting geometry is converted to the 'before' geometry
612 * by at most an atomic level change. They could be the same.
613 * Similarly the 'after' geometry is converted to the final
614 * geometry by at most a level change.
615 * Note that 'before' and 'after' must have the same level.
616 * 'blocks' is the minimum number of sectors for a reshape unit.
617 * This will be a multiple of the stripe size in each of the
618 * 'before' and 'after' geometries.
619 * If 'blocks' is 0, no restriping is necessary.
620 * 'min_offset_change' is the minimum change to data_offset to
621 * allow the reshape to happen. It is at least the larger of
622 * the old and new chunk sizes, and typically the same as 'blocks'
623 * divided by number of data disks.
627 int parity
; /* number of parity blocks/devices */
632 unsigned long long backup_blocks
;
633 unsigned long long min_offset_change
;
634 unsigned long long stripes
; /* number of old stripes that comprise 'blocks'*/
635 unsigned long long new_size
; /* New size of array in sectors */
638 /* A superswitch provides entry point the a metadata handler.
640 * The superswitch primarily operates on some "metadata" that
641 * is accessed via the 'supertype'.
642 * This metadata has one of three possible sources.
643 * 1/ It is read from a single device. In this case it may not completely
644 * describe the array or arrays as some information might be on other
646 * 2/ It is read from all devices in a container. In this case all
647 * information is present.
648 * 3/ It is created by ->init_super / ->add_to_super. In this case it will
649 * be complete once enough ->add_to_super calls have completed.
651 * When creating an array inside a container, the metadata will be
652 * formed by a combination of 2 and 3. The metadata or the array is read,
653 * then new information is added.
655 * The metadata must sometimes have a concept of a 'current' array
656 * and a 'current' device.
657 * The 'current' array is set by init_super to be the newly created array,
658 * or is set by super_by_fd when it finds it is looking at an array inside
661 * The 'current' device is either the device that the metadata was read from
662 * in case 1, or the last device added by add_to_super in case 3.
663 * Case 2 does not identify a 'current' device.
665 extern struct superswitch
{
667 /* Used to report details of metadata read from a component
668 * device. ->load_super has been called.
670 void (*examine_super
)(struct supertype
*st
, char *homehost
);
671 void (*brief_examine_super
)(struct supertype
*st
, int verbose
);
672 void (*brief_examine_subarrays
)(struct supertype
*st
, int verbose
);
673 void (*export_examine_super
)(struct supertype
*st
);
674 int (*examine_badblocks
)(struct supertype
*st
, int fd
, char *devname
);
675 int (*copy_metadata
)(struct supertype
*st
, int from
, int to
);
677 /* Used to report details of an active array.
678 * ->load_super was possibly given a 'component' string.
680 void (*detail_super
)(struct supertype
*st
, char *homehost
);
681 void (*brief_detail_super
)(struct supertype
*st
);
682 void (*export_detail_super
)(struct supertype
*st
);
684 /* Optional: platform hardware / firmware details */
685 int (*detail_platform
)(int verbose
, int enumerate_only
, char *controller_path
);
686 int (*export_detail_platform
)(int verbose
, char *controller_path
);
689 * to get uuid to storing in bitmap metadata
690 * and 'reshape' backup-data metadata
691 * To see if a device is being re-added to an array it was part of.
693 void (*uuid_from_super
)(struct supertype
*st
, int uuid
[4]);
695 /* Extract generic details from metadata. This could be details about
696 * the container, or about an individual array within the container.
697 * The determination is made either by:
698 * load_super being given a 'component' string.
699 * validate_geometry determining what to create.
700 * The info includes both array information and device information.
701 * The particular device should be:
702 * The last device added by add_to_super
703 * The device the metadata was loaded from by load_super
704 * If 'map' is present, then it is an array raid_disks long
705 * (raid_disk must already be set and correct) and it is filled
706 * with 1 for slots that are thought to be active and 0 for slots which
707 * appear to be failed/missing.
708 * *info is zeroed out before data is added.
710 void (*getinfo_super
)(struct supertype
*st
, struct mdinfo
*info
, char *map
);
711 struct mdinfo
*(*getinfo_super_disks
)(struct supertype
*st
);
712 /* Check if the given metadata is flagged as belonging to "this"
713 * host. 0 for 'no', 1 for 'yes', -1 for "Don't record homehost"
715 int (*match_home
)(struct supertype
*st
, char *homehost
);
717 /* Make one of several generic modifications to metadata
718 * prior to assembly (or other times).
719 * sparc2.2 - first bug in early 0.90 metadata
720 * super-minor - change name of 0.90 metadata
721 * summaries - 'correct' any redundant data
722 * resync - mark array as dirty to trigger a resync.
723 * uuid - set new uuid - only 0.90 or 1.x
724 * name - change the name of the array (where supported)
725 * homehost - change which host this array is tied to.
726 * devicesize - If metadata is at start of device, change recorded
727 * device size to match actual device size
728 * byteorder - swap bytes for 0.90 metadata
730 * force-one - mark that device as uptodate, not old or failed.
731 * force-array - mark array as clean if it would not otherwise
733 * assemble - not sure how this is different from force-one...
734 * linear-grow-new - add a new device to a linear array, but don't
735 * change the size: so superblock still matches
736 * linear-grow-update - now change the size of the array.
737 * writemostly - set the WriteMostly1 bit in the superblock devflags
738 * readwrite - clear the WriteMostly1 bit in the superblock devflags
739 * no-bitmap - clear any record that a bitmap is present.
740 * bbl - add a bad-block-log if possible
741 * no-bbl - remove and bad-block-log is it is empty.
742 * revert-reshape - If a reshape is in progress, modify metadata so
743 * it will resume going in the opposite direction.
745 int (*update_super
)(struct supertype
*st
, struct mdinfo
*info
,
747 char *devname
, int verbose
,
748 int uuid_set
, char *homehost
);
750 /* Create new metadata for new array as described. This could
751 * be a new container, or an array in a pre-existing container.
752 * Also used to zero metadata prior to writing it to invalidate old
755 int (*init_super
)(struct supertype
*st
, mdu_array_info_t
*info
,
756 unsigned long long size
, char *name
,
757 char *homehost
, int *uuid
,
758 unsigned long long data_offset
);
760 /* update the metadata to include new device, either at create or
761 * when hot-adding a spare.
763 int (*add_to_super
)(struct supertype
*st
, mdu_disk_info_t
*dinfo
,
764 int fd
, char *devname
,
765 unsigned long long data_offset
);
766 /* update the metadata to delete a device,
769 int (*remove_from_super
)(struct supertype
*st
, mdu_disk_info_t
*dinfo
);
771 /* Write metadata to one device when fixing problems or adding
774 int (*store_super
)(struct supertype
*st
, int fd
);
776 /* Write all metadata for this array.
778 int (*write_init_super
)(struct supertype
*st
);
779 /* Check if metadata read from one device is compatible with an array,
780 * used when assembling an array, or pseudo-assembling was with
781 * "--examine --brief"
782 * If "st" has not yet been loaded the superblock from, "tst" is
783 * moved in, otherwise the superblock in 'st' is compared with
786 int (*compare_super
)(struct supertype
*st
, struct supertype
*tst
);
787 /* Load metadata from a single device. If 'devname' is not NULL
788 * print error messages as appropriate */
789 int (*load_super
)(struct supertype
*st
, int fd
, char *devname
);
790 /* 'fd' is a 'container' md array - load array metadata from the
793 int (*load_container
)(struct supertype
*st
, int fd
, char *devname
);
794 /* If 'arg' is a valid name of this metadata type, allocate and
795 * return a 'supertype' for the particular minor version */
796 struct supertype
* (*match_metadata_desc
)(char *arg
);
797 /* If a device has the given size, and the data_offset has been
798 * requested - work out how much space is available for data.
799 * This involves adjusting for reserved space (e.g. bitmaps)
800 * and for any rounding.
801 * 'mdadm' only calls this for existing arrays where a possible
802 * spare is being added. However some super-handlers call it
803 * internally from validate_geometry when creating an array.
805 __u64 (*avail_size
)(struct supertype
*st
, __u64 size
,
806 unsigned long long data_offset
);
807 /* This is similar to 'avail_size' in purpose, but is used for
808 * containers for which there is no 'component size' to compare.
809 * This reports that whole-device size which is a minimum
811 unsigned long long (*min_acceptable_spare_size
)(struct supertype
*st
);
812 /* Find somewhere to put a bitmap - possibly auto-size it - and
813 * update the metadata to record this. The array may be newly
814 * created, in which case data_size may be updated, or it might
815 * already exist. Metadata handler can know if init_super
816 * has been called, but not write_init_super.
818 int (*add_internal_bitmap
)(struct supertype
*st
, int *chunkp
,
819 int delay
, int write_behind
,
820 unsigned long long size
, int may_change
, int major
);
821 /* Seek 'fd' to start of write-intent-bitmap. Must be an
822 * md-native format bitmap
824 void (*locate_bitmap
)(struct supertype
*st
, int fd
);
825 /* if add_internal_bitmap succeeded for existing array, this
828 int (*write_bitmap
)(struct supertype
*st
, int fd
);
829 /* Free the superblock and any other allocated data */
830 void (*free_super
)(struct supertype
*st
);
832 /* validate_geometry is called with an st returned by
833 * match_metadata_desc.
834 * It should check that the geometry described is compatible with
835 * the metadata type. It will be called repeatedly as devices
836 * added to validate changing size and new devices. If there are
837 * inter-device dependencies, it should record sufficient details
838 * so these can be validated.
839 * Both 'size' and '*freesize' are in sectors. chunk is KiB.
841 * 1: everything is OK
842 * 0: not OK for some reason - if 'verbose', then error was reported.
843 * -1: st->sb was NULL, 'subdev' is a member of a container of this
844 * type, but array is not acceptable for some reason
845 * message was reported even if verbose is 0.
847 int (*validate_geometry
)(struct supertype
*st
, int level
, int layout
,
849 int *chunk
, unsigned long long size
,
850 unsigned long long data_offset
,
851 char *subdev
, unsigned long long *freesize
,
854 /* Return a linked list of 'mdinfo' structures for all arrays
855 * in the container. For non-containers, it is like
856 * getinfo_super with an allocated mdinfo.*/
857 struct mdinfo
*(*container_content
)(struct supertype
*st
, char *subarray
);
858 /* query the supertype for default geometry */
859 void (*default_geometry
)(struct supertype
*st
, int *level
, int *layout
, int *chunk
); /* optional */
860 /* Permit subarray's to be deleted from inactive containers */
861 int (*kill_subarray
)(struct supertype
*st
); /* optional */
862 /* Permit subarray's to be modified */
863 int (*update_subarray
)(struct supertype
*st
, char *subarray
,
864 char *update
, struct mddev_ident
*ident
); /* optional */
865 /* Check if reshape is supported for this external format.
866 * st is obtained from super_by_fd() where st->subarray[0] is
867 * initialized to indicate if reshape is being performed at the
868 * container or subarray level
870 #define APPLY_METADATA_CHANGES 1
871 #define ROLLBACK_METADATA_CHANGES 0
873 int (*reshape_super
)(struct supertype
*st
,
874 unsigned long long size
, int level
,
875 int layout
, int chunksize
, int raid_disks
,
876 int delta_disks
, char *backup
, char *dev
,
878 int verbose
); /* optional */
879 int (*manage_reshape
)( /* optional */
880 int afd
, struct mdinfo
*sra
, struct reshape
*reshape
,
881 struct supertype
*st
, unsigned long blocks
,
882 int *fds
, unsigned long long *offsets
,
883 int dests
, int *destfd
, unsigned long long *destoffsets
);
886 int (*open_new
)(struct supertype
*c
, struct active_array
*a
,
889 /* Tell the metadata handler the current state of the array.
890 * This covers whether it is known to be consistent (no pending writes)
891 * and how far along a resync is known to have progressed
892 * (in a->resync_start).
893 * resync status is really irrelevant if the array is not consistent,
894 * but some metadata (DDF!) have a place to record the distinction.
895 * If 'consistent' is '2', then the array can mark it dirty if a
896 * resync/recovery/whatever is required, or leave it clean if not.
897 * Return value is 0 dirty (not consistent) and 1 if clean.
898 * it is only really important if consistent is passed in as '2'.
900 int (*set_array_state
)(struct active_array
*a
, int consistent
);
902 /* When the state of a device might have changed, we call set_disk to
903 * tell the metadata what the current state is.
904 * Typically this happens on spare->in_sync and (spare|in_sync)->faulty
906 * set_disk might be called when the state of the particular disk has
907 * not in fact changed.
909 void (*set_disk
)(struct active_array
*a
, int n
, int state
);
910 void (*sync_metadata
)(struct supertype
*st
);
911 void (*process_update
)(struct supertype
*st
,
912 struct metadata_update
*update
);
913 void (*prepare_update
)(struct supertype
*st
,
914 struct metadata_update
*update
);
916 /* activate_spare will check if the array is degraded and, if it
917 * is, try to find some spare space in the container.
918 * On success, it add appropriate updates (For process_update) to
919 * to the 'updates' list and returns a list of 'mdinfo' identifying
920 * the device, or devices as there might be multiple missing
921 * devices and multiple spares available.
923 struct mdinfo
*(*activate_spare
)(struct active_array
*a
,
924 struct metadata_update
**updates
);
926 * Return statically allocated string that represents metadata specific
927 * controller domain of the disk. The domain is used in disk domain
928 * matching functions. Disks belong to the same domain if the they have
929 * the same domain from mdadm.conf and belong the same metadata domain.
930 * Returning NULL or not providing this handler means that metadata
931 * does not distinguish the differences between disks that belong to
932 * different controllers. They are in the domain specified by
933 * configuration file (mdadm.conf).
934 * In case when the metadata has the notion of domains based on disk
935 * it shall return NULL for disks that do not belong to the controller
936 * the supported domains. Such disks will form another domain and won't
937 * be mixed with supported ones.
939 const char *(*get_disk_controller_domain
)(const char *path
);
941 /* for external backup area */
942 int (*recover_backup
)(struct supertype
*st
, struct mdinfo
*info
);
944 int swapuuid
; /* true if uuid is bigending rather than hostendian */
946 const char *name
; /* canonical metadata name */
949 extern struct superswitch super0
, super1
;
950 extern struct superswitch super_imsm
, super_ddf
;
951 extern struct superswitch mbr
, gpt
;
953 struct metadata_update
{
956 void *space
; /* allocated space that monitor will use */
957 void **space_list
; /* list of allocated spaces that monitor can
958 * use or that it returned.
960 struct metadata_update
*next
;
963 /* A supertype holds a particular collection of metadata.
964 * It identifies the metadata type by the superswitch, and the particular
965 * sub-version of that metadata type.
966 * metadata read in or created is stored in 'sb' and 'info'.
967 * There are also fields used by mdmon to track containers.
969 * A supertype may refer to:
970 * Just an array, possibly in a container
971 * A container, not identifying any particular array
972 * Info read from just one device, not yet fully describing the array/container.
975 * A supertype is created by:
981 struct superswitch
*ss
;
984 char container_devnm
[32]; /* devnm of container */
987 void *other
; /* Hack used to convert v0.90 to v1.0 */
988 unsigned long long devsize
;
989 int ignore_hw_compat
; /* used to inform metadata handlers that it should ignore
990 HW/firmware related incompatability to load metadata.
991 Used when examining metadata to display content of disk
992 when user has no hw/firmare compatible system.
994 struct metadata_update
*updates
;
995 struct metadata_update
**update_tail
;
997 /* extra stuff used by mdmon */
998 struct active_array
*arrays
;
999 int sock
; /* listen to external programs */
1000 char devnm
[32]; /* e.g. md0. This appears in metadata_version:
1006 struct mdinfo
*devs
;
1010 extern struct supertype
*super_by_fd(int fd
, char **subarray
);
1011 enum guess_types
{ guess_any
, guess_array
, guess_partitions
};
1012 extern struct supertype
*guess_super_type(int fd
, enum guess_types guess_type
);
1013 static inline struct supertype
*guess_super(int fd
) {
1014 return guess_super_type(fd
, guess_any
);
1016 extern struct supertype
*dup_super(struct supertype
*st
);
1017 extern int get_dev_size(int fd
, char *dname
, unsigned long long *sizep
);
1018 extern int must_be_container(int fd
);
1019 extern int dev_size_from_id(dev_t id
, unsigned long long *size
);
1020 void wait_for(char *dev
, int fd
);
1023 * Data structures for policy management.
1024 * Each device can have a policy structure that lists
1025 * various name/value pairs each possibly with a metadata associated.
1026 * The policy list is sorted by name/value/metadata
1029 struct dev_policy
*next
;
1030 char *name
; /* None of these strings are allocated. They are
1031 * all just references to strings which are known
1032 * to exist elsewhere.
1033 * name and metadata can be compared by address equality.
1035 const char *metadata
;
1039 extern char pol_act
[], pol_domain
[], pol_metadata
[], pol_auto
[];
1041 /* iterate over the sublist starting at list, having the same
1042 * 'name' as 'list', and matching the given metadata (Where
1043 * NULL matches anything
1045 #define pol_for_each(item, list, _metadata) \
1047 item && item->name == list->name; \
1048 item = item->next) \
1049 if (!(!_metadata || !item->metadata || _metadata == item->metadata)) \
1053 * policy records read from mdadm are largely just name-value pairs.
1054 * The names are constants, not strdupped
1057 struct pol_rule
*next
;
1058 char *type
; /* rule_policy or rule_part */
1063 char *dups
; /* duplicates of 'value' with a partNN appended */
1067 extern char rule_policy
[], rule_part
[];
1068 extern char rule_path
[], rule_type
[];
1069 extern char type_part
[], type_disk
[];
1071 extern void policyline(char *line
, char *type
);
1072 extern void policy_add(char *type
, ...);
1073 extern void policy_free(void);
1075 extern struct dev_policy
*path_policy(char *path
, char *type
);
1076 extern struct dev_policy
*disk_policy(struct mdinfo
*disk
);
1077 extern struct dev_policy
*devid_policy(int devid
);
1078 extern void dev_policy_free(struct dev_policy
*p
);
1080 //extern void pol_new(struct dev_policy **pol, char *name, char *val, char *metadata);
1081 extern void pol_add(struct dev_policy
**pol
, char *name
, char *val
, char *metadata
);
1082 extern struct dev_policy
*pol_find(struct dev_policy
*pol
, char *name
);
1084 enum policy_action
{
1088 act_spare
, /* This only applies to bare devices */
1089 act_spare_same_slot
, /* this allows non-bare devices,
1090 * but only if recent removal */
1091 act_force_spare
, /* this allow non-bare devices in any case */
1095 extern int policy_action_allows(struct dev_policy
*plist
, const char *metadata
,
1096 enum policy_action want
);
1097 extern int disk_action_allows(struct mdinfo
*disk
, const char *metadata
,
1098 enum policy_action want
);
1101 struct domainlist
*next
;
1105 extern int domain_test(struct domainlist
*dom
, struct dev_policy
*pol
,
1106 const char *metadata
);
1107 extern struct domainlist
*domain_from_array(struct mdinfo
*mdi
,
1108 const char *metadata
);
1109 extern void domainlist_add_dev(struct domainlist
**dom
, int devid
,
1110 const char *metadata
);
1111 extern void domain_free(struct domainlist
*dl
);
1112 extern void domain_merge(struct domainlist
**domp
, struct dev_policy
*pol
,
1113 const char *metadata
);
1114 void domain_add(struct domainlist
**domp
, char *domain
);
1116 extern void policy_save_path(char *id_path
, struct map_ent
*array
);
1117 extern int policy_check_path(struct mdinfo
*disk
, struct map_ent
*array
);
1123 #define HAVE_NFTW we assume
1127 # include <features.h>
1128 # ifndef __UCLIBC_HAS_LFS__
1129 # define lseek64 lseek
1131 # ifndef __UCLIBC_HAS_FTW__
1141 #if defined(__KLIBC__)
1157 extern int add_dev(const char *name
, const struct stat
*stb
, int flag
, struct FTW
*s
);
1159 extern int Manage_ro(char *devname
, int fd
, int readonly
);
1160 extern int Manage_run(char *devname
, int fd
, int quiet
);
1161 extern int Manage_stop(char *devname
, int fd
, int quiet
,
1163 extern int Manage_subdevs(char *devname
, int fd
,
1164 struct mddev_dev
*devlist
, int verbose
, int test
,
1165 char *update
, int force
);
1166 extern int autodetect(void);
1167 extern int Grow_Add_device(char *devname
, int fd
, char *newdev
);
1168 extern int Grow_addbitmap(char *devname
, int fd
,
1169 struct context
*c
, struct shape
*s
);
1170 extern int Grow_reshape(char *devname
, int fd
,
1171 struct mddev_dev
*devlist
,
1172 unsigned long long data_offset
,
1173 struct context
*c
, struct shape
*s
);
1174 extern int Grow_restart(struct supertype
*st
, struct mdinfo
*info
,
1175 int *fdlist
, int cnt
, char *backup_file
, int verbose
);
1176 extern int Grow_continue(int mdfd
, struct supertype
*st
,
1177 struct mdinfo
*info
, char *backup_file
,
1178 int freeze_reshape
);
1180 extern int restore_backup(struct supertype
*st
,
1181 struct mdinfo
*content
,
1186 extern int Grow_continue_command(char *devname
, int fd
,
1187 char *backup_file
, int verbose
);
1189 extern int Assemble(struct supertype
*st
, char *mddev
,
1190 struct mddev_ident
*ident
,
1191 struct mddev_dev
*devlist
,
1194 extern int Build(char *mddev
, struct mddev_dev
*devlist
,
1195 struct shape
*s
, struct context
*c
);
1197 extern int Create(struct supertype
*st
, char *mddev
,
1198 char *name
, int *uuid
,
1199 int subdevs
, struct mddev_dev
*devlist
,
1202 unsigned long long data_offset
);
1204 extern int Detail(char *dev
, struct context
*c
);
1205 extern int Detail_Platform(struct superswitch
*ss
, int scan
, int verbose
, int export
, char *controller_path
);
1206 extern int Query(char *dev
);
1207 extern int ExamineBadblocks(char *devname
, int brief
, struct supertype
*forcest
);
1208 extern int Examine(struct mddev_dev
*devlist
, struct context
*c
,
1209 struct supertype
*forcest
);
1210 extern int Monitor(struct mddev_dev
*devlist
,
1211 char *mailaddr
, char *alert_cmd
,
1213 int daemonise
, int oneshot
,
1214 int dosyslog
, char *pidfile
, int increments
,
1217 extern int Kill(char *dev
, struct supertype
*st
, int force
, int verbose
, int noexcl
);
1218 extern int Kill_subarray(char *dev
, char *subarray
, int verbose
);
1219 extern int Update_subarray(char *dev
, char *subarray
, char *update
, struct mddev_ident
*ident
, int quiet
);
1220 extern int Wait(char *dev
);
1221 extern int WaitClean(char *dev
, int sock
, int verbose
);
1223 extern int Incremental(char *devname
, struct context
*c
,
1224 struct supertype
*st
);
1225 extern void RebuildMap(void);
1226 extern int IncrementalScan(int verbose
);
1227 extern int IncrementalRemove(char *devname
, char *path
, int verbose
);
1228 extern int CreateBitmap(char *filename
, int force
, char uuid
[16],
1229 unsigned long chunksize
, unsigned long daemon_sleep
,
1230 unsigned long write_behind
,
1231 unsigned long long array_size
,
1233 extern int ExamineBitmap(char *filename
, int brief
, struct supertype
*st
);
1234 extern int Write_rules(char *rule_name
);
1235 extern int bitmap_update_uuid(int fd
, int *uuid
, int swap
);
1236 extern unsigned long bitmap_sectors(struct bitmap_super_s
*bsb
);
1237 extern int Dump_metadata(char *dev
, char *dir
, struct context
*c
,
1238 struct supertype
*st
);
1239 extern int Restore_metadata(char *dev
, char *dir
, struct context
*c
,
1240 struct supertype
*st
, int only
);
1242 extern int md_get_version(int fd
);
1243 extern int get_linux_version(void);
1244 extern int mdadm_version(char *version
);
1245 extern unsigned long long parse_size(char *size
);
1246 extern int parse_uuid(char *str
, int uuid
[4]);
1247 extern int parse_layout_10(char *layout
);
1248 extern int parse_layout_faulty(char *layout
);
1249 extern long parse_num(char *num
);
1250 extern int check_ext2(int fd
, char *name
);
1251 extern int check_reiser(int fd
, char *name
);
1252 extern int check_raid(int fd
, char *name
);
1253 extern int check_partitions(int fd
, char *dname
,
1254 unsigned long long freesize
,
1255 unsigned long long size
);
1257 extern int get_mdp_major(void);
1258 extern int dev_open(char *dev
, int flags
);
1259 extern int open_dev(char *devnm
);
1260 extern int open_dev_flags(char *devnm
, int flags
);
1261 extern int open_dev_excl(char *devnm
);
1262 extern int is_standard(char *dev
, int *nump
);
1263 extern int same_dev(char *one
, char *two
);
1264 extern int compare_paths (char* path1
,char* path2
);
1265 extern void enable_fds(int devices
);
1267 extern int parse_auto(char *str
, char *msg
, int config
);
1268 extern struct mddev_ident
*conf_get_ident(char *dev
);
1269 extern struct mddev_dev
*conf_get_devs(void);
1270 extern int conf_test_dev(char *devname
);
1271 extern int conf_test_metadata(const char *version
, struct dev_policy
*pol
, int is_homehost
);
1272 extern struct createinfo
*conf_get_create_info(void);
1273 extern void set_conffile(char *file
);
1274 extern char *conf_get_mailaddr(void);
1275 extern char *conf_get_mailfrom(void);
1276 extern char *conf_get_program(void);
1277 extern char *conf_get_homehost(int *require_homehostp
);
1278 extern char *conf_line(FILE *file
);
1279 extern char *conf_word(FILE *file
, int allow_key
);
1280 extern void print_quoted(char *str
);
1281 extern void print_escape(char *str
);
1282 extern int use_udev(void);
1283 extern unsigned long GCD(unsigned long a
, unsigned long b
);
1284 extern int conf_name_is_free(char *name
);
1285 extern int conf_verify_devnames(struct mddev_ident
*array_list
);
1286 extern int devname_matches(char *name
, char *match
);
1287 extern struct mddev_ident
*conf_match(struct supertype
*st
,
1288 struct mdinfo
*info
,
1290 int verbose
, int *rvp
);
1291 extern int experimental(void);
1293 extern void free_line(char *line
);
1294 extern int match_oneof(char *devices
, char *devname
);
1295 extern void uuid_from_super(int uuid
[4], mdp_super_t
*super
);
1296 extern const int uuid_zero
[4];
1297 extern int same_uuid(int a
[4], int b
[4], int swapuuid
);
1298 extern void copy_uuid(void *a
, int b
[4], int swapuuid
);
1299 extern char *__fname_from_uuid(int id
[4], int swap
, char *buf
, char sep
);
1300 extern char *fname_from_uuid(struct supertype
*st
,
1301 struct mdinfo
*info
, char *buf
, char sep
);
1302 extern unsigned long calc_csum(void *super
, int bytes
);
1303 extern int enough(int level
, int raid_disks
, int layout
, int clean
,
1305 extern int enough_fd(int fd
);
1306 extern int ask(char *mesg
);
1307 extern unsigned long long get_component_size(int fd
);
1308 extern void remove_partitions(int fd
);
1309 extern int test_partition(int fd
);
1310 extern int test_partition_from_id(dev_t id
);
1311 extern int get_data_disks(int level
, int layout
, int raid_disks
);
1312 extern unsigned long long calc_array_size(int level
, int raid_disks
, int layout
,
1313 int chunksize
, unsigned long long devsize
);
1314 extern int flush_metadata_updates(struct supertype
*st
);
1315 extern void append_metadata_update(struct supertype
*st
, void *buf
, int len
);
1316 extern int assemble_container_content(struct supertype
*st
, int mdfd
,
1317 struct mdinfo
*content
,
1320 extern struct mdinfo
*container_choose_spares(struct supertype
*st
,
1321 unsigned long long min_size
,
1322 struct domainlist
*domlist
,
1324 const char *metadata
, int get_one
);
1325 extern int move_spare(char *from_devname
, char *to_devname
, dev_t devid
);
1326 extern int add_disk(int mdfd
, struct supertype
*st
,
1327 struct mdinfo
*sra
, struct mdinfo
*info
);
1328 extern int remove_disk(int mdfd
, struct supertype
*st
,
1329 struct mdinfo
*sra
, struct mdinfo
*info
);
1330 extern int set_array_info(int mdfd
, struct supertype
*st
, struct mdinfo
*info
);
1331 unsigned long long min_recovery_start(struct mdinfo
*array
);
1333 extern char *human_size(long long bytes
);
1334 extern char *human_size_brief(long long bytes
, int prefix
);
1335 extern void print_r10_layout(int layout
);
1337 extern char *find_free_devnm(int use_partitions
);
1339 extern void put_md_name(char *name
);
1340 extern char *devid2devnm(int devid
);
1341 extern int devnm2devid(char *devnm
);
1342 extern char *get_md_name(char *devnm
);
1344 extern char DefaultConfFile
[];
1346 extern int create_mddev(char *dev
, char *name
, int autof
, int trustworthy
,
1348 /* values for 'trustworthy' */
1350 #define LOCAL_ANY 10
1353 extern int open_mddev(char *dev
, int report_errors
);
1354 extern int open_container(int fd
);
1355 extern int metadata_container_matches(char *metadata
, char *devnm
);
1356 extern int metadata_subdev_matches(char *metadata
, char *devnm
);
1357 extern int is_container_member(struct mdstat_ent
*ent
, char *devname
);
1358 extern int is_subarray_active(char *subarray
, char *devname
);
1359 extern int open_subarray(char *dev
, char *subarray
, struct supertype
*st
, int quiet
);
1360 extern struct superswitch
*version_to_superswitch(char *vers
);
1362 extern int mdmon_running(char *devnm
);
1363 extern int mdmon_pid(char *devnm
);
1364 extern int check_env(char *name
);
1365 extern __u32
random32(void);
1366 extern int start_mdmon(char *devnm
);
1368 extern int child_monitor(int afd
, struct mdinfo
*sra
, struct reshape
*reshape
,
1369 struct supertype
*st
, unsigned long stripes
,
1370 int *fds
, unsigned long long *offsets
,
1371 int dests
, int *destfd
, unsigned long long *destoffsets
);
1372 void abort_reshape(struct mdinfo
*sra
);
1374 void *super1_make_v0(struct supertype
*st
, struct mdinfo
*info
, mdp_super_t
*sb0
);
1376 extern void fmt_devname(char *name
, int num
);
1377 extern char *stat2devnm(struct stat
*st
);
1378 extern char *fd2devnm(int fd
);
1380 #define _ROUND_UP(val, base) (((val) + (base) - 1) & ~(base - 1))
1381 #define ROUND_UP(val, base) _ROUND_UP(val, (typeof(val))(base))
1382 #define ROUND_UP_PTR(ptr, base) ((typeof(ptr)) \
1383 (ROUND_UP((unsigned long)(ptr), base)))
1385 static inline int is_subarray(char *vers
)
1387 /* The version string for a 'subarray' (an array in a container)
1389 * /containername/componentname for normal read-write arrays
1390 * -containername/componentname for arrays which mdmon must not
1391 * reconfigure. They might be read-only
1392 * or might be undergoing reshape etc.
1393 * containername is e.g. md0, md_d1
1394 * componentname is dependant on the metadata. e.g. '1' 'S1' ...
1396 return (*vers
== '/' || *vers
== '-');
1399 static inline char *to_subarray(struct mdstat_ent
*ent
, char *container
)
1401 return &ent
->metadata_version
[10+strlen(container
)+1];
1405 #define dprintf(fmt, arg...) \
1406 fprintf(stderr, fmt, ##arg)
1408 #define dprintf(fmt, arg...) \
1409 ({ if (0) fprintf(stderr, fmt, ##arg); 0; })
1413 static inline int xasprintf(char **strp
, const char *fmt
, ...) {
1417 ret
= vasprintf(strp
, fmt
, ap
);
1423 #define pr_err(fmt ...) fprintf(stderr, Name ": " fmt)
1424 #define cont_err(fmt ...) fprintf(stderr, " " fmt)
1426 void *xmalloc(size_t len
);
1427 void *xrealloc(void *ptr
, size_t len
);
1428 void *xcalloc(size_t num
, size_t size
);
1429 char *xstrdup(const char *str
);
1431 #define LEVEL_MULTIPATH (-4)
1432 #define LEVEL_LINEAR (-1)
1433 #define LEVEL_FAULTY (-5)
1435 /* kernel module doesn't know about these */
1436 #define LEVEL_CONTAINER (-100)
1437 #define LEVEL_UNSUPPORTED (-200)
1441 #define WriteTransient 0
1442 #define ReadTransient 1
1443 #define WritePersistent 2
1444 #define ReadPersistent 3
1445 #define WriteAll 4 /* doesn't go to device */
1446 #define ReadFixable 5
1449 #define ClearErrors 31
1450 #define ClearFaults 30
1452 #define AllPersist 100 /* internal use only */
1453 #define NoPersist 101
1455 #define ModeMask 0x1f
1462 #define minor(x) ((x)&0xff)
1463 #define major(x) (((x)>>8)&0xff)
1464 #define makedev(M,m) (((M)<<8) | (m))
1468 #define ALGORITHM_LEFT_ASYMMETRIC 0
1469 #define ALGORITHM_RIGHT_ASYMMETRIC 1
1470 #define ALGORITHM_LEFT_SYMMETRIC 2
1471 #define ALGORITHM_RIGHT_SYMMETRIC 3
1473 /* Define non-rotating (raid4) algorithms. These allow
1474 * conversion of raid4 to raid5.
1476 #define ALGORITHM_PARITY_0 4 /* P or P,Q are initial devices */
1477 #define ALGORITHM_PARITY_N 5 /* P or P,Q are final devices. */
1479 /* DDF RAID6 layouts differ from md/raid6 layouts in two ways.
1480 * Firstly, the exact positioning of the parity block is slightly
1481 * different between the 'LEFT_*' modes of md and the "_N_*" modes
1483 * Secondly, or order of datablocks over which the Q syndrome is computed
1485 * Consequently we have different layouts for DDF/raid6 than md/raid6.
1486 * These layouts are from the DDFv1.2 spec.
1487 * Interestingly DDFv1.2-Errata-A does not specify N_CONTINUE but
1488 * leaves RLQ=3 as 'Vendor Specific'
1491 #define ALGORITHM_ROTATING_ZERO_RESTART 8 /* DDF PRL=6 RLQ=1 */
1492 #define ALGORITHM_ROTATING_N_RESTART 9 /* DDF PRL=6 RLQ=2 */
1493 #define ALGORITHM_ROTATING_N_CONTINUE 10 /*DDF PRL=6 RLQ=3 */
1495 /* For every RAID5 algorithm we define a RAID6 algorithm
1496 * with exactly the same layout for data and parity, and
1497 * with the Q block always on the last device (N-1).
1498 * This allows trivial conversion from RAID5 to RAID6
1500 #define ALGORITHM_LEFT_ASYMMETRIC_6 16
1501 #define ALGORITHM_RIGHT_ASYMMETRIC_6 17
1502 #define ALGORITHM_LEFT_SYMMETRIC_6 18
1503 #define ALGORITHM_RIGHT_SYMMETRIC_6 19
1504 #define ALGORITHM_PARITY_0_6 20
1505 #define ALGORITHM_PARITY_N_6 ALGORITHM_PARITY_N
1507 /* Define PATH_MAX in case we don't use glibc or standard library does
1508 * not have PATH_MAX defined. Assume max path length is 4K characters.
1511 #define PATH_MAX 4096
1514 #define RESYNC_NONE -1
1515 #define RESYNC_DELAYED -2
1516 #define RESYNC_PENDING -3
1517 #define RESYNC_UNKNOWN -4
1519 /* When using "GET_DISK_INFO" it isn't certain how high
1520 * we need to check. So we impose an absolute limit of
1521 * MAX_DISKS. This needs to be much more than the largest
1522 * number of devices any metadata can support. Currently
1523 * v1.x can support 1920
1525 #define MAX_DISKS 4096
1527 /* Sometimes the 'size' value passed needs to mean "Maximum".
1528 * In those cases with use MAX_SIZE
1532 /* We want to use unsigned numbers for sector counts, but need
1533 * a value for 'invalid'. Use '1'.
1535 #define INVALID_SECTORS 1
1536 /* And another special number needed for --data_offset=variable */
1537 #define VARIABLE_OFFSET 3