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
28 #if !defined(__dietlibc__) && !defined(__KLIBC__)
29 extern __off64_t lseek64
__P ((int __fd
, __off64_t __offset
, int __whence
));
31 # if defined(__NO_STAT64) || __WORDSIZE != 32
32 # define lseek64 lseek
36 #include <sys/types.h>
49 /* dietlibc has deprecated random and srandom!! */
55 #include <linux/kdev_t.h>
56 /*#include <linux/fs.h> */
57 #include <sys/mount.h>
58 #include <asm/types.h>
59 #include <sys/ioctl.h>
61 #define MdpMinorShift 6
64 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
67 #define DEFAULT_BITMAP_CHUNK 4096
68 #define DEFAULT_BITMAP_DELAY 5
69 #define DEFAULT_MAX_WRITE_BEHIND 256
71 /* VAR_RUN is where pid and socket files used for communicating
72 * with mdmon normally live. It should be /var/run, but if
73 * it is too hard to remount /var/run as read-only rather than
74 * unmounting it at shutdown time, then it should be
75 * redefined to some place that comfortably persists until
76 * final shutdown, possibly in /dev if that is a tmpfs.
77 * Note: VAR_RUN does not need to be writable at shutdown,
78 * only during boot when "mdmon --takeover" is run.
81 #define VAR_RUN "/var/run/mdadm"
83 /* ALT_RUN should be somewhere that persists across the pivotroot
84 * from early boot to late boot.
85 * If you don't have /lib/init/rw you might want to use /dev/.something
88 #define ALT_RUN "/lib/init/rw/mdadm"
91 #define ALT_MAPFILE "map"
92 #endif /* ALT_MAPFILE */
100 /* Redhat don't like to #include <asm/byteorder.h>, and
101 * some time include <linux/byteorder/xxx_endian.h> isn't enough,
102 * and there is no standard conversion function so... */
103 /* And dietlibc doesn't think byteswap is ok, so.. */
104 /* #include <byteswap.h> */
105 #define bswap_16(x) (((x) & 0x00ffU) << 8 | \
106 ((x) & 0xff00U) >> 8)
107 #define bswap_32(x) (((x) & 0x000000ffU) << 24 | \
108 ((x) & 0xff000000U) >> 24 | \
109 ((x) & 0x0000ff00U) << 8 | \
110 ((x) & 0x00ff0000U) >> 8)
111 #define bswap_64(x) (((x) & 0x00000000000000ffULL) << 56 | \
112 ((x) & 0xff00000000000000ULL) >> 56 | \
113 ((x) & 0x000000000000ff00ULL) << 40 | \
114 ((x) & 0x00ff000000000000ULL) >> 40 | \
115 ((x) & 0x0000000000ff0000ULL) << 24 | \
116 ((x) & 0x0000ff0000000000ULL) >> 24 | \
117 ((x) & 0x00000000ff000000ULL) << 8 | \
118 ((x) & 0x000000ff00000000ULL) >> 8)
120 #if !defined(__KLIBC__)
121 #if BYTE_ORDER == LITTLE_ENDIAN
122 #define __cpu_to_le16(_x) (_x)
123 #define __cpu_to_le32(_x) (_x)
124 #define __cpu_to_le64(_x) (_x)
125 #define __le16_to_cpu(_x) (_x)
126 #define __le32_to_cpu(_x) (_x)
127 #define __le64_to_cpu(_x) (_x)
129 #define __cpu_to_be16(_x) bswap_16(_x)
130 #define __cpu_to_be32(_x) bswap_32(_x)
131 #define __cpu_to_be64(_x) bswap_64(_x)
132 #define __be16_to_cpu(_x) bswap_16(_x)
133 #define __be32_to_cpu(_x) bswap_32(_x)
134 #define __be64_to_cpu(_x) bswap_64(_x)
135 #elif BYTE_ORDER == BIG_ENDIAN
136 #define __cpu_to_le16(_x) bswap_16(_x)
137 #define __cpu_to_le32(_x) bswap_32(_x)
138 #define __cpu_to_le64(_x) bswap_64(_x)
139 #define __le16_to_cpu(_x) bswap_16(_x)
140 #define __le32_to_cpu(_x) bswap_32(_x)
141 #define __le64_to_cpu(_x) bswap_64(_x)
143 #define __cpu_to_be16(_x) (_x)
144 #define __cpu_to_be32(_x) (_x)
145 #define __cpu_to_be64(_x) (_x)
146 #define __be16_to_cpu(_x) (_x)
147 #define __be32_to_cpu(_x) (_x)
148 #define __be64_to_cpu(_x) (_x)
150 # error "unknown endianness."
152 #endif /* __KLIBC__ */
156 * min()/max()/clamp() macros that also do
157 * strict type-checking.. See the
158 * "unnecessary" pointer comparison.
160 #define min(x, y) ({ \
161 typeof(x) _min1 = (x); \
162 typeof(y) _min2 = (y); \
163 (void) (&_min1 == &_min2); \
164 _min1 < _min2 ? _min1 : _min2; })
166 #define max(x, y) ({ \
167 typeof(x) _max1 = (x); \
168 typeof(y) _max2 = (y); \
169 (void) (&_max1 == &_max2); \
170 _max1 > _max2 ? _max1 : _max2; })
172 /* general information that might be extracted from a superblock */
174 mdu_array_info_t array
;
175 mdu_disk_info_t disk
;
179 unsigned long long data_offset
;
180 unsigned long long component_size
; /* same as array.size, except in
181 * sectors and up to 64bits.
183 unsigned long long custom_array_size
; /* size for non-default sized
184 * arrays (in sectors)
187 unsigned long long reshape_progress
;
189 unsigned long long resync_start
; /* per-array resync position */
190 unsigned long long recovery_start
; /* per-device rebuild position */
191 #define MaxSector (~0ULL) /* resync/recovery complete position */
193 unsigned long safe_mode_delay
; /* ms delay to mark clean */
194 int new_level
, delta_disks
, new_layout
, new_chunk
;
196 int cache_size
; /* size of raid456 stripe cache*/
198 char text_version
[50];
199 void *update_private
; /* for passing metadata-format
200 * specific update data
201 * between successive calls to
205 int container_member
; /* for assembling external-metatdata arrays
206 * This is to be used internally by metadata
213 /* Device info for mdmon: */
218 #define DS_WRITE_MOSTLY 4
220 #define DS_BLOCKED 16
221 #define DS_REMOVE 1024
222 #define DS_UNBLOCK 2048
223 int prev_state
, curr_state
, next_state
;
233 struct supertype
*supertype
;
250 extern char short_options
[];
251 extern char short_bitmap_options
[];
252 extern char short_bitmap_auto_options
[];
253 extern struct option long_options
[];
254 extern char Version
[], Usage
[], Help
[], OptionHelp
[],
255 Help_create
[], Help_build
[], Help_assemble
[], Help_grow
[],
257 Help_manage
[], Help_misc
[], Help_monitor
[], Help_config
[];
259 /* for option that don't have short equivilents, we assign arbitrary
260 * small numbers. '1' means an undecorated option, so we start at '2'.
262 enum special_options
{
278 /* structures read from config file */
279 /* List of mddevice names and identifiers
280 * Identifiers can be:
282 * super-minor=decimal-minor-number-from-superblock
283 * devices=comma,separated,list,of,device,names,with,wildcards
285 * If multiple fields are present, the intersection of all matching
286 * devices is considered
288 #define UnSet (0xfffe)
289 typedef struct mddev_ident_s
{
296 unsigned int super_minor
;
298 char *devices
; /* comma separated list of device
299 * names with wild cards
302 unsigned int raid_disks
;
303 unsigned int spare_disks
;
304 struct supertype
*st
;
305 int autof
; /* 1 for normal, 2 for partitioned */
310 char *container
; /* /dev/whatever name of container, or
311 * uuid of container. You would expect
312 * this to be the 'devname' or UUID
313 * of some other entry.
315 char *member
; /* subarray within a container */
317 struct mddev_ident_s
*next
;
319 /* fields needed by different users of this structure */
320 int assembled
; /* set when assembly succeeds */
324 /* List of device names - wildcards expanded */
325 typedef struct mddev_dev_s
{
327 char disposition
; /* 'a' for add, 'r' for remove, 'f' for fail.
328 * Not set for names read from .config
330 char writemostly
; /* 1 for 'set writemostly', 2 for 'clear writemostly' */
332 char used
; /* set when used */
333 struct mdinfo
*content
; /* If devname is a container, this might list
334 * the remaining member arrays. */
335 struct mddev_dev_s
*next
;
338 typedef struct mapping
{
349 char *pattern
; /* U or up, _ for down */
350 int percent
; /* -1 if no resync */
351 int resync
; /* 1 if resync, 0 if recovery */
355 char * metadata_version
;
356 struct mdstat_ent
*next
;
359 extern struct mdstat_ent
*mdstat_read(int hold
, int start
);
360 extern void free_mdstat(struct mdstat_ent
*ms
);
361 extern void mdstat_wait(int seconds
);
362 extern void mdstat_wait_fd(int fd
, const sigset_t
*sigmask
);
363 extern int mddev_busy(int devnum
);
366 struct map_ent
*next
;
373 extern int map_update(struct map_ent
**mpp
, int devnum
, char *metadata
,
374 int uuid
[4], char *path
);
375 extern void map_remove(struct map_ent
**map
, int devnum
);
376 extern struct map_ent
*map_by_uuid(struct map_ent
**map
, int uuid
[4]);
377 extern struct map_ent
*map_by_devnum(struct map_ent
**map
, int devnum
);
378 extern struct map_ent
*map_by_name(struct map_ent
**map
, char *name
);
379 extern void map_read(struct map_ent
**melp
);
380 extern int map_write(struct map_ent
*mel
);
381 extern void map_delete(struct map_ent
**mapp
, int devnum
);
382 extern void map_free(struct map_ent
*map
);
383 extern void map_add(struct map_ent
**melp
,
384 int devnum
, char *metadata
, int uuid
[4], char *path
);
385 extern int map_lock(struct map_ent
**melp
);
386 extern void map_unlock(struct map_ent
**melp
);
388 /* various details can be requested */
389 enum sysfs_read_flags
{
390 GET_LEVEL
= (1 << 0),
391 GET_LAYOUT
= (1 << 1),
392 GET_COMPONENT
= (1 << 2),
393 GET_CHUNK
= (1 << 3),
394 GET_CACHE
= (1 << 4),
395 GET_MISMATCH
= (1 << 5),
396 GET_VERSION
= (1 << 6),
397 GET_DISKS
= (1 << 7),
398 GET_DEGRADED
= (1 << 8),
399 GET_SAFEMODE
= (1 << 9),
400 GET_DEVS
= (1 << 10), /* gets role, major, minor */
401 GET_OFFSET
= (1 << 11),
402 GET_SIZE
= (1 << 12),
403 GET_STATE
= (1 << 13),
404 GET_ERROR
= (1 << 14),
405 SKIP_GONE_DEVS
= (1 << 15),
408 /* If fd >= 0, get the array it is open on,
409 * else use devnum. >=0 -> major9. <0.....
411 extern int sysfs_open(int devnum
, char *devname
, char *attr
);
412 extern void sysfs_init(struct mdinfo
*mdi
, int fd
, int devnum
);
413 extern void sysfs_free(struct mdinfo
*sra
);
414 extern struct mdinfo
*sysfs_read(int fd
, int devnum
, unsigned long options
);
415 extern int sysfs_attr_match(const char *attr
, const char *str
);
416 extern int sysfs_match_word(const char *word
, char **list
);
417 extern int sysfs_set_str(struct mdinfo
*sra
, struct mdinfo
*dev
,
418 char *name
, char *val
);
419 extern int sysfs_set_num(struct mdinfo
*sra
, struct mdinfo
*dev
,
420 char *name
, unsigned long long val
);
421 extern int sysfs_uevent(struct mdinfo
*sra
, char *event
);
422 extern int sysfs_get_fd(struct mdinfo
*sra
, struct mdinfo
*dev
,
424 extern int sysfs_fd_get_ll(int fd
, unsigned long long *val
);
425 extern int sysfs_get_ll(struct mdinfo
*sra
, struct mdinfo
*dev
,
426 char *name
, unsigned long long *val
);
427 extern int sysfs_fd_get_str(int fd
, char *val
, int size
);
428 extern int sysfs_get_str(struct mdinfo
*sra
, struct mdinfo
*dev
,
429 char *name
, char *val
, int size
);
430 extern int sysfs_set_safemode(struct mdinfo
*sra
, unsigned long ms
);
431 extern int sysfs_set_array(struct mdinfo
*info
, int vers
);
432 extern int sysfs_add_disk(struct mdinfo
*sra
, struct mdinfo
*sd
, int resume
);
433 extern int sysfs_disk_to_scsi_id(int fd
, __u32
*id
);
434 extern int sysfs_unique_holder(int devnum
, long rdev
);
435 extern int load_sys(char *path
, char *buf
);
438 extern int save_stripes(int *source
, unsigned long long *offsets
,
439 int raid_disks
, int chunk_size
, int level
, int layout
,
440 int nwrites
, int *dest
,
441 unsigned long long start
, unsigned long long length
,
443 extern int restore_stripes(int *dest
, unsigned long long *offsets
,
444 int raid_disks
, int chunk_size
, int level
, int layout
,
445 int source
, unsigned long long read_offset
,
446 unsigned long long start
, unsigned long long length
);
449 #define Sendmail "/usr/lib/sendmail -t"
452 #define SYSLOG_FACILITY LOG_DAEMON
454 extern char *map_num(mapping_t
*map
, int num
);
455 extern int map_name(mapping_t
*map
, char *name
);
456 extern mapping_t r5layout
[], r6layout
[], pers
[], modes
[], faultylayout
[];
458 extern char *map_dev(int major
, int minor
, int create
);
461 struct metadata_update
;
463 /* A superswitch provides entry point the a metadata handler.
465 * The super_switch primarily operates on some "metadata" that
466 * is accessed via the 'supertype'.
467 * This metadata has one of three possible sources.
468 * 1/ It is read from a single device. In this case it may not completely
469 * describe the array or arrays as some information might be on other
471 * 2/ It is read from all devices in a container. In this case all
472 * information is present.
473 * 3/ It is created by ->init_super / ->add_to_super. In this case it will
474 * be complete once enough ->add_to_super calls have completed.
476 * When creating an array inside a container, the metadata will be
477 * formed by a combination of 2 and 3. The metadata or the array is read,
478 * then new information is added.
480 * The metadata must sometimes have a concept of a 'current' array
481 * and a 'current' device.
482 * The 'current' array is set by init_super to be the newly created array,
483 * or is set by super_by_fd when it finds it is looking at an array inside
486 * The 'current' device is either the device that the metadata was read from
487 * in case 1, or the last device added by add_to_super in case 3.
488 * Case 2 does not identify a 'current' device.
490 extern struct superswitch
{
492 /* Used to report details of metadata read from a component
493 * device. ->load_super has been called.
495 void (*examine_super
)(struct supertype
*st
, char *homehost
);
496 void (*brief_examine_super
)(struct supertype
*st
, int verbose
);
497 void (*brief_examine_subarrays
)(struct supertype
*st
, int verbose
);
498 void (*export_examine_super
)(struct supertype
*st
);
500 /* Used to report details of an active array.
501 * ->load_super was possibly given a 'component' string.
503 void (*detail_super
)(struct supertype
*st
, char *homehost
);
504 void (*brief_detail_super
)(struct supertype
*st
);
505 void (*export_detail_super
)(struct supertype
*st
);
507 /* Optional: platform hardware / firmware details */
508 int (*detail_platform
)(int verbose
, int enumerate_only
);
511 * to get uuid to storing in bitmap metadata
512 * and 'reshape' backup-data metadata
513 * To see if a device is being re-added to an array it was part of.
515 void (*uuid_from_super
)(struct supertype
*st
, int uuid
[4]);
517 /* Extract generic details from metadata. This could be details about
518 * the container, or about an individual array within the container.
519 * The determination is made either by:
520 * load_super being given a 'component' string.
521 * validate_geometry determining what to create.
522 * The info includes both array information and device information.
523 * The particular device should be:
524 * The last device added by add_to_super
525 * The device the metadata was loaded from by load_super
527 void (*getinfo_super
)(struct supertype
*st
, struct mdinfo
*info
);
529 /* Check if the given metadata is flagged as belonging to "this"
530 * host. 0 for 'no', 1 for 'yes', -1 for "Don't record homehost"
532 int (*match_home
)(struct supertype
*st
, char *homehost
);
534 /* Make one of several generic modifications to metadata
535 * prior to assembly (or other times).
536 * sparc2.2 - first bug in early 0.90 metadata
537 * super-minor - change name of 0.90 metadata
538 * summaries - 'correct' any redundant data
539 * resync - mark array as dirty to trigger a resync.
540 * uuid - set new uuid - only 0.90 or 1.x
541 * name - change the name of the array (where supported)
542 * homehost - change which host this array is tied to.
543 * devicesize - If metadata is at start of device, change recorded
544 * device size to match actual device size
545 * byteorder - swap bytes for 0.90 metadata
547 * force-one - mark that device as uptodate, not old or failed.
548 * force-array - mark array as clean if it would not otherwise
550 * assemble - not sure how this is different from force-one...
551 * linear-grow-new - add a new device to a linear array, but don't
552 * change the size: so superblock still matches
553 * linear-grow-update - now change the size of the array.
555 int (*update_super
)(struct supertype
*st
, struct mdinfo
*info
,
557 char *devname
, int verbose
,
558 int uuid_set
, char *homehost
);
560 /* Create new metadata for new array as described. This could
561 * be a new container, or an array in a pre-existing container.
562 * Also used to zero metadata prior to writing it to invalidate old
565 int (*init_super
)(struct supertype
*st
, mdu_array_info_t
*info
,
566 unsigned long long size
, char *name
,
567 char *homehost
, int *uuid
);
569 /* update the metadata to include new device, either at create or
570 * when hot-adding a spare.
572 int (*add_to_super
)(struct supertype
*st
, mdu_disk_info_t
*dinfo
,
573 int fd
, char *devname
);
575 /* Write metadata to one device when fixing problems or adding
578 int (*store_super
)(struct supertype
*st
, int fd
);
580 /* Write all metadata for this array.
582 int (*write_init_super
)(struct supertype
*st
);
583 int (*compare_super
)(struct supertype
*st
, struct supertype
*tst
);
584 int (*load_super
)(struct supertype
*st
, int fd
, char *devname
);
585 struct supertype
* (*match_metadata_desc
)(char *arg
);
586 __u64 (*avail_size
)(struct supertype
*st
, __u64 size
);
587 int (*add_internal_bitmap
)(struct supertype
*st
, int *chunkp
,
588 int delay
, int write_behind
,
589 unsigned long long size
, int may_change
, int major
);
590 void (*locate_bitmap
)(struct supertype
*st
, int fd
);
591 int (*write_bitmap
)(struct supertype
*st
, int fd
);
592 void (*free_super
)(struct supertype
*st
);
594 /* validate_geometry is called with an st returned by
595 * match_metadata_desc.
596 * It should check that the geometry described in compatible with
597 * the metadata type. It will be called repeatedly as devices
598 * added to validate changing size and new devices. If there are
599 * inter-device dependencies, it should record sufficient details
600 * so these can be validated.
601 * Both 'size' and '*freesize' are in sectors. chunk is bytes.
603 int (*validate_geometry
)(struct supertype
*st
, int level
, int layout
,
605 int chunk
, unsigned long long size
,
606 char *subdev
, unsigned long long *freesize
,
609 struct mdinfo
*(*container_content
)(struct supertype
*st
);
610 /* Allow a metadata handler to override mdadm's default layouts */
611 int (*default_layout
)(int level
); /* optional */
614 int (*open_new
)(struct supertype
*c
, struct active_array
*a
,
617 /* Tell the metadata handler the current state of the array.
618 * This covers whether it is known to be consistent (no pending writes)
619 * and how far along a resync is known to have progressed
620 * (in a->resync_start).
621 * resync status is really irrelevant if the array is not consistent,
622 * but some metadata (DDF!) have a place to record the distinction.
623 * If 'consistent' is '2', then the array can mark it dirty if a
624 * resync/recovery/whatever is required, or leave it clean if not.
625 * Return value is 0 dirty (not consistent) and 1 if clean.
626 * it is only really important if consistent is passed in as '2'.
628 int (*set_array_state
)(struct active_array
*a
, int consistent
);
630 /* When the state of a device might have changed, we call set_disk to
631 * tell the metadata what the current state is.
632 * Typically this happens on spare->in_sync and (spare|in_sync)->faulty
634 * set_disk might be called when the state of the particular disk has
635 * not in fact changed.
637 void (*set_disk
)(struct active_array
*a
, int n
, int state
);
638 void (*sync_metadata
)(struct supertype
*st
);
639 void (*process_update
)(struct supertype
*st
,
640 struct metadata_update
*update
);
641 void (*prepare_update
)(struct supertype
*st
,
642 struct metadata_update
*update
);
644 /* activate_spare will check if the array is degraded and, if it
645 * is, try to find some spare space in the container.
646 * On success, it add appropriate updates (For process_update) to
647 * to the 'updates' list and returns a list of 'mdinfo' identifying
648 * the device, or devices as there might be multiple missing
649 * devices and multiple spares available.
651 struct mdinfo
*(*activate_spare
)(struct active_array
*a
,
652 struct metadata_update
**updates
);
654 int swapuuid
; /* true if uuid is bigending rather than hostendian */
656 const char *name
; /* canonical metadata name */
657 } super0
, super1
, super_ddf
, *superlist
[];
659 extern struct superswitch super_imsm
;
661 struct metadata_update
{
664 void *space
; /* allocated space that monitor will use */
665 struct metadata_update
*next
;
668 /* A supertype holds a particular collection of metadata.
669 * It identifies the metadata type by the superswitch, and the particular
670 * sub-version of that metadata type.
671 * metadata read in or created is stored in 'sb' and 'info'.
672 * There are also fields used by mdmon to track containers.
674 * A supertype may refer to:
675 * Just an array, possibly in a container
676 * A container, not identifying any particular array
677 * Info read from just one device, not yet fully describing the array/container.
680 * A supertype is created by:
686 struct superswitch
*ss
;
689 int container_dev
; /* devnum of container */
690 char subarray
[32]; /* name of array inside container */
693 int loaded_container
; /* Set if load_super found a container,
694 * not just one device */
696 struct metadata_update
*updates
;
697 struct metadata_update
**update_tail
;
699 /* extra stuff used by mdmon */
700 struct active_array
*arrays
;
701 int sock
; /* listen to external programs */
703 char *devname
; /* e.g. md0. This appears in metadata_verison:
712 extern struct supertype
*super_by_fd(int fd
);
713 extern struct supertype
*guess_super(int fd
);
714 extern struct supertype
*dup_super(struct supertype
*st
);
715 extern int get_dev_size(int fd
, char *dname
, unsigned long long *sizep
);
716 extern void get_one_disk(int mdfd
, mdu_array_info_t
*ainf
,
717 mdu_disk_info_t
*disk
);
718 void wait_for(char *dev
, int fd
);
724 #define HAVE_NFTW we assume
728 # include <features.h>
729 # ifndef __UCLIBC_HAS_LFS__
730 # define lseek64 lseek
732 # ifndef __UCLIBC_HAS_FTW__
742 #if defined(__KLIBC__)
758 extern int add_dev(const char *name
, const struct stat
*stb
, int flag
, struct FTW
*s
);
761 extern int Manage_ro(char *devname
, int fd
, int readonly
);
762 extern int Manage_runstop(char *devname
, int fd
, int runstop
, int quiet
);
763 extern int Manage_resize(char *devname
, int fd
, long long size
, int raid_disks
);
764 extern int Manage_subdevs(char *devname
, int fd
,
765 mddev_dev_t devlist
, int verbose
);
766 extern int autodetect(void);
767 extern int Grow_Add_device(char *devname
, int fd
, char *newdev
);
768 extern int Grow_addbitmap(char *devname
, int fd
, char *file
, int chunk
, int delay
, int write_behind
, int force
);
769 extern int Grow_reshape(char *devname
, int fd
, int quiet
, char *backup_file
,
771 int level
, char *layout_str
, int chunksize
, int raid_disks
);
772 extern int Grow_restart(struct supertype
*st
, struct mdinfo
*info
,
773 int *fdlist
, int cnt
, char *backup_file
, int verbose
);
774 extern int Grow_continue(int mdfd
, struct supertype
*st
,
775 struct mdinfo
*info
, char *backup_file
);
777 extern int Assemble(struct supertype
*st
, char *mddev
,
779 mddev_dev_t devlist
, char *backup_file
,
780 int readonly
, int runstop
,
781 char *update
, char *homehost
, int require_homehost
,
782 int verbose
, int force
);
784 extern int Build(char *mddev
, int chunk
, int level
, int layout
,
785 int raiddisks
, mddev_dev_t devlist
, int assume_clean
,
786 char *bitmap_file
, int bitmap_chunk
, int write_behind
,
787 int delay
, int verbose
, int autof
, unsigned long long size
);
790 extern int Create(struct supertype
*st
, char *mddev
,
791 int chunk
, int level
, int layout
, unsigned long long size
, int raiddisks
, int sparedisks
,
792 char *name
, char *homehost
, int *uuid
,
793 int subdevs
, mddev_dev_t devlist
,
794 int runstop
, int verbose
, int force
, int assume_clean
,
795 char *bitmap_file
, int bitmap_chunk
, int write_behind
, int delay
, int autof
);
797 extern int Detail(char *dev
, int brief
, int export
, int test
, char *homehost
);
798 extern int Detail_Platform(struct superswitch
*ss
, int scan
, int verbose
);
799 extern int Query(char *dev
);
800 extern int Examine(mddev_dev_t devlist
, int brief
, int export
, int scan
,
801 int SparcAdjust
, struct supertype
*forcest
, char *homehost
);
802 extern int Monitor(mddev_dev_t devlist
,
803 char *mailaddr
, char *alert_cmd
,
804 int period
, int daemonise
, int scan
, int oneshot
,
805 int dosyslog
, int test
, char *pidfile
, int increments
);
807 extern int Kill(char *dev
, struct supertype
*st
, int force
, int quiet
, int noexcl
);
808 extern int Wait(char *dev
);
809 extern int WaitClean(char *dev
, int sock
, int verbose
);
811 extern int Incremental(char *devname
, int verbose
, int runstop
,
812 struct supertype
*st
, char *homehost
, int require_homehost
,
814 extern int Incremental_container(struct supertype
*st
, char *devname
,
815 int verbose
, int runstop
, int autof
,
817 extern void RebuildMap(void);
818 extern int IncrementalScan(int verbose
);
820 extern int CreateBitmap(char *filename
, int force
, char uuid
[16],
821 unsigned long chunksize
, unsigned long daemon_sleep
,
822 unsigned long write_behind
,
823 unsigned long long array_size
,
825 extern int ExamineBitmap(char *filename
, int brief
, struct supertype
*st
);
826 extern int bitmap_update_uuid(int fd
, int *uuid
, int swap
);
827 extern unsigned long bitmap_sectors(struct bitmap_super_s
*bsb
);
829 extern int md_get_version(int fd
);
830 extern int get_linux_version(void);
831 extern long long parse_size(char *size
);
832 extern int parse_uuid(char *str
, int uuid
[4]);
833 extern int parse_layout_10(char *layout
);
834 extern int parse_layout_faulty(char *layout
);
835 extern int check_ext2(int fd
, char *name
);
836 extern int check_reiser(int fd
, char *name
);
837 extern int check_raid(int fd
, char *name
);
838 extern int check_partitions(int fd
, char *dname
, unsigned long long freesize
);
840 extern int get_mdp_major(void);
841 extern int dev_open(char *dev
, int flags
);
842 extern int open_dev(int devnum
);
843 extern int open_dev_excl(int devnum
);
844 extern int is_standard(char *dev
, int *nump
);
845 extern int same_dev(char *one
, char *two
);
847 extern int parse_auto(char *str
, char *msg
, int config
);
848 extern mddev_ident_t
conf_get_ident(char *dev
);
849 extern mddev_dev_t
conf_get_devs(void);
850 extern int conf_test_dev(char *devname
);
851 extern int conf_test_metadata(const char *version
, int is_homehost
);
852 extern struct createinfo
*conf_get_create_info(void);
853 extern void set_conffile(char *file
);
854 extern char *conf_get_mailaddr(void);
855 extern char *conf_get_mailfrom(void);
856 extern char *conf_get_program(void);
857 extern char *conf_get_homehost(int *require_homehostp
);
858 extern char *conf_line(FILE *file
);
859 extern char *conf_word(FILE *file
, int allow_key
);
860 extern int conf_name_is_free(char *name
);
861 extern int devname_matches(char *name
, char *match
);
862 extern struct mddev_ident_s
*conf_match(struct mdinfo
*info
, struct supertype
*st
);
864 extern void free_line(char *line
);
865 extern int match_oneof(char *devices
, char *devname
);
866 extern void uuid_from_super(int uuid
[4], mdp_super_t
*super
);
867 extern const int uuid_match_any
[4];
868 extern int same_uuid(int a
[4], int b
[4], int swapuuid
);
869 extern void copy_uuid(void *a
, int b
[4], int swapuuid
);
870 extern char *__fname_from_uuid(int id
[4], int swap
, char *buf
, char sep
);
871 extern char *fname_from_uuid(struct supertype
*st
,
872 struct mdinfo
*info
, char *buf
, char sep
);
873 extern unsigned long calc_csum(void *super
, int bytes
);
874 extern int enough(int level
, int raid_disks
, int layout
, int clean
,
875 char *avail
, int avail_disks
);
876 extern int ask(char *mesg
);
877 extern unsigned long long get_component_size(int fd
);
878 extern void remove_partitions(int fd
);
879 extern unsigned long long calc_array_size(int level
, int raid_disks
, int layout
,
880 int chunksize
, unsigned long long devsize
);
881 extern int flush_metadata_updates(struct supertype
*st
);
882 extern void append_metadata_update(struct supertype
*st
, void *buf
, int len
);
883 extern int assemble_container_content(struct supertype
*st
, int mdfd
,
884 struct mdinfo
*content
, int runstop
,
885 char *chosen_name
, int verbose
);
887 extern int add_disk(int mdfd
, struct supertype
*st
,
888 struct mdinfo
*sra
, struct mdinfo
*info
);
889 extern int set_array_info(int mdfd
, struct supertype
*st
, struct mdinfo
*info
);
890 unsigned long long min_recovery_start(struct mdinfo
*array
);
892 extern char *human_size(long long bytes
);
893 extern char *human_size_brief(long long bytes
);
894 extern void print_r10_layout(int layout
);
896 #define NoMdDev (1<<23)
897 extern int find_free_devnum(int use_partitions
);
899 extern void put_md_name(char *name
);
900 extern char *get_md_name(int dev
);
902 extern char DefaultConfFile
[];
904 extern int create_mddev(char *dev
, char *name
, int autof
, int trustworthy
,
906 /* values for 'trustworthy' */
911 extern int open_mddev(char *dev
, int report_errors
);
912 extern int open_container(int fd
);
914 extern char *pid_dir
;
915 extern int mdmon_running(int devnum
);
916 extern int mdmon_pid(int devnum
);
917 extern int check_env(char *name
);
918 extern __u32
random32(void);
919 extern int start_mdmon(int devnum
);
921 extern char *devnum2devname(int num
);
922 extern int devname2devnum(char *name
);
923 extern int stat2devnum(struct stat
*st
);
924 extern int fd2devnum(int fd
);
926 static inline int dev2major(int d
)
931 return get_mdp_major();
934 static inline int dev2minor(int d
)
938 return (-1-d
) << MdpMinorShift
;
941 static inline int ROUND_UP(int a
, int base
)
943 return ((a
+base
-1)/base
)*base
;
946 static inline int is_subarray(char *vers
)
948 /* The version string for a 'subarray' (an array in a container)
950 * /containername/componentname for normal read-write arrays
951 * -containername/componentname for read-only arrays.
952 * containername is e.g. md0, md_d1
953 * componentname is dependant on the metadata. e.g. '1' 'S1' ...
955 return (*vers
== '/' || *vers
== '-');
959 #define dprintf(fmt, arg...) \
960 fprintf(stderr, fmt, ##arg)
962 #define dprintf(fmt, arg...) \
963 ({ if (0) fprintf(stderr, fmt, ##arg); 0; })
967 static inline int xasprintf(char **strp
, const char *fmt
, ...) {
971 ret
= vasprintf(strp
, fmt
, ap
);
977 #define LEVEL_MULTIPATH (-4)
978 #define LEVEL_LINEAR (-1)
979 #define LEVEL_FAULTY (-5)
981 /* kernel module doesn't know about these */
982 #define LEVEL_CONTAINER (-100)
983 #define LEVEL_UNSUPPORTED (-200)
988 #define WriteTransient 0
989 #define ReadTransient 1
990 #define WritePersistent 2
991 #define ReadPersistent 3
992 #define WriteAll 4 /* doesn't go to device */
993 #define ReadFixable 5
996 #define ClearErrors 31
997 #define ClearFaults 30
999 #define AllPersist 100 /* internal use only */
1000 #define NoPersist 101
1002 #define ModeMask 0x1f
1010 #define minor(x) ((x)&0xff)
1011 #define major(x) (((x)>>8)&0xff)
1012 #define makedev(M,m) (((M)<<8) | (m))
1016 #define ALGORITHM_LEFT_ASYMMETRIC 0
1017 #define ALGORITHM_RIGHT_ASYMMETRIC 1
1018 #define ALGORITHM_LEFT_SYMMETRIC 2
1019 #define ALGORITHM_RIGHT_SYMMETRIC 3
1021 /* Define non-rotating (raid4) algorithms. These allow
1022 * conversion of raid4 to raid5.
1024 #define ALGORITHM_PARITY_0 4 /* P or P,Q are initial devices */
1025 #define ALGORITHM_PARITY_N 5 /* P or P,Q are final devices. */
1027 /* DDF RAID6 layouts differ from md/raid6 layouts in two ways.
1028 * Firstly, the exact positioning of the parity block is slightly
1029 * different between the 'LEFT_*' modes of md and the "_N_*" modes
1031 * Secondly, or order of datablocks over which the Q syndrome is computed
1033 * Consequently we have different layouts for DDF/raid6 than md/raid6.
1034 * These layouts are from the DDFv1.2 spec.
1035 * Interestingly DDFv1.2-Errata-A does not specify N_CONTINUE but
1036 * leaves RLQ=3 as 'Vendor Specific'
1039 #define ALGORITHM_ROTATING_ZERO_RESTART 8 /* DDF PRL=6 RLQ=1 */
1040 #define ALGORITHM_ROTATING_N_RESTART 9 /* DDF PRL=6 RLQ=2 */
1041 #define ALGORITHM_ROTATING_N_CONTINUE 10 /*DDF PRL=6 RLQ=3 */
1044 /* For every RAID5 algorithm we define a RAID6 algorithm
1045 * with exactly the same layout for data and parity, and
1046 * with the Q block always on the last device (N-1).
1047 * This allows trivial conversion from RAID5 to RAID6
1049 #define ALGORITHM_LEFT_ASYMMETRIC_6 16
1050 #define ALGORITHM_RIGHT_ASYMMETRIC_6 17
1051 #define ALGORITHM_LEFT_SYMMETRIC_6 18
1052 #define ALGORITHM_RIGHT_SYMMETRIC_6 19
1053 #define ALGORITHM_PARITY_0_6 20
1054 #define ALGORITHM_PARITY_N_6 ALGORITHM_PARITY_N
1056 /* Define PATH_MAX in case we don't use glibc or standard library does
1057 * not have PATH_MAX defined. Assume max path length is 4K characters.
1060 #define PATH_MAX 4096