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"
97 /* Redhat don't like to #include <asm/byteorder.h>, and
98 * some time include <linux/byteorder/xxx_endian.h> isn't enough,
99 * and there is no standard conversion function so... */
100 /* And dietlibc doesn't think byteswap is ok, so.. */
101 /* #include <byteswap.h> */
102 #define bswap_16(x) (((x) & 0x00ffU) << 8 | \
103 ((x) & 0xff00U) >> 8)
104 #define bswap_32(x) (((x) & 0x000000ffU) << 24 | \
105 ((x) & 0xff000000U) >> 24 | \
106 ((x) & 0x0000ff00U) << 8 | \
107 ((x) & 0x00ff0000U) >> 8)
108 #define bswap_64(x) (((x) & 0x00000000000000ffULL) << 56 | \
109 ((x) & 0xff00000000000000ULL) >> 56 | \
110 ((x) & 0x000000000000ff00ULL) << 40 | \
111 ((x) & 0x00ff000000000000ULL) >> 40 | \
112 ((x) & 0x0000000000ff0000ULL) << 24 | \
113 ((x) & 0x0000ff0000000000ULL) >> 24 | \
114 ((x) & 0x00000000ff000000ULL) << 8 | \
115 ((x) & 0x000000ff00000000ULL) >> 8)
117 #if !defined(__KLIBC__)
118 #if BYTE_ORDER == LITTLE_ENDIAN
119 #define __cpu_to_le16(_x) (_x)
120 #define __cpu_to_le32(_x) (_x)
121 #define __cpu_to_le64(_x) (_x)
122 #define __le16_to_cpu(_x) (_x)
123 #define __le32_to_cpu(_x) (_x)
124 #define __le64_to_cpu(_x) (_x)
126 #define __cpu_to_be16(_x) bswap_16(_x)
127 #define __cpu_to_be32(_x) bswap_32(_x)
128 #define __cpu_to_be64(_x) bswap_64(_x)
129 #define __be16_to_cpu(_x) bswap_16(_x)
130 #define __be32_to_cpu(_x) bswap_32(_x)
131 #define __be64_to_cpu(_x) bswap_64(_x)
132 #elif BYTE_ORDER == BIG_ENDIAN
133 #define __cpu_to_le16(_x) bswap_16(_x)
134 #define __cpu_to_le32(_x) bswap_32(_x)
135 #define __cpu_to_le64(_x) bswap_64(_x)
136 #define __le16_to_cpu(_x) bswap_16(_x)
137 #define __le32_to_cpu(_x) bswap_32(_x)
138 #define __le64_to_cpu(_x) bswap_64(_x)
140 #define __cpu_to_be16(_x) (_x)
141 #define __cpu_to_be32(_x) (_x)
142 #define __cpu_to_be64(_x) (_x)
143 #define __be16_to_cpu(_x) (_x)
144 #define __be32_to_cpu(_x) (_x)
145 #define __be64_to_cpu(_x) (_x)
147 # error "unknown endianness."
149 #endif /* __KLIBC__ */
153 * min()/max()/clamp() macros that also do
154 * strict type-checking.. See the
155 * "unnecessary" pointer comparison.
157 #define min(x, y) ({ \
158 typeof(x) _min1 = (x); \
159 typeof(y) _min2 = (y); \
160 (void) (&_min1 == &_min2); \
161 _min1 < _min2 ? _min1 : _min2; })
163 #define max(x, y) ({ \
164 typeof(x) _max1 = (x); \
165 typeof(y) _max2 = (y); \
166 (void) (&_max1 == &_max2); \
167 _max1 > _max2 ? _max1 : _max2; })
169 /* general information that might be extracted from a superblock */
171 mdu_array_info_t array
;
172 mdu_disk_info_t disk
;
176 unsigned long long data_offset
;
177 unsigned long long component_size
; /* same as array.size, except in
178 * sectors and up to 64bits.
180 unsigned long long custom_array_size
; /* size for non-default sized
181 * arrays (in sectors)
184 unsigned long long reshape_progress
;
186 unsigned long long resync_start
; /* per-array resync position */
187 unsigned long long recovery_start
; /* per-device rebuild position */
188 #define MaxSector (~0ULL) /* resync/recovery complete position */
190 unsigned long safe_mode_delay
; /* ms delay to mark clean */
191 int new_level
, delta_disks
, new_layout
, new_chunk
;
193 int cache_size
; /* size of raid456 stripe cache*/
195 char text_version
[50];
196 void *update_private
; /* for passing metadata-format
197 * specific update data
198 * between successive calls to
202 int container_member
; /* for assembling external-metatdata arrays
203 * This is to be used internally by metadata
210 /* Device info for mdmon: */
215 #define DS_WRITE_MOSTLY 4
217 #define DS_BLOCKED 16
218 #define DS_REMOVE 1024
219 #define DS_UNBLOCK 2048
220 int prev_state
, curr_state
, next_state
;
230 struct supertype
*supertype
;
247 extern char short_options
[];
248 extern char short_bitmap_options
[];
249 extern char short_bitmap_auto_options
[];
250 extern struct option long_options
[];
251 extern char Version
[], Usage
[], Help
[], OptionHelp
[],
252 Help_create
[], Help_build
[], Help_assemble
[], Help_grow
[],
254 Help_manage
[], Help_misc
[], Help_monitor
[], Help_config
[];
256 /* for option that don't have short equivilents, we assign arbitrary
257 * small numbers. '1' means an undecorated option, so we start at '2'.
259 enum special_options
{
275 /* structures read from config file */
276 /* List of mddevice names and identifiers
277 * Identifiers can be:
279 * super-minor=decimal-minor-number-from-superblock
280 * devices=comma,separated,list,of,device,names,with,wildcards
282 * If multiple fields are present, the intersection of all matching
283 * devices is considered
285 #define UnSet (0xfffe)
286 typedef struct mddev_ident_s
{
293 unsigned int super_minor
;
295 char *devices
; /* comma separated list of device
296 * names with wild cards
299 unsigned int raid_disks
;
300 unsigned int spare_disks
;
301 struct supertype
*st
;
302 int autof
; /* 1 for normal, 2 for partitioned */
307 char *container
; /* /dev/whatever name of container, or
308 * uuid of container. You would expect
309 * this to be the 'devname' or UUID
310 * of some other entry.
312 char *member
; /* subarray within a container */
314 struct mddev_ident_s
*next
;
316 /* fields needed by different users of this structure */
317 int assembled
; /* set when assembly succeeds */
321 /* List of device names - wildcards expanded */
322 typedef struct mddev_dev_s
{
324 char disposition
; /* 'a' for add, 'r' for remove, 'f' for fail.
325 * Not set for names read from .config
327 char writemostly
; /* 1 for 'set writemostly', 2 for 'clear writemostly' */
329 char used
; /* set when used */
330 struct mdinfo
*content
; /* If devname is a container, this might list
331 * the remaining member arrays. */
332 struct mddev_dev_s
*next
;
335 typedef struct mapping
{
346 char *pattern
; /* U or up, _ for down */
347 int percent
; /* -1 if no resync */
348 int resync
; /* 1 if resync, 0 if recovery */
352 char * metadata_version
;
353 struct mdstat_ent
*next
;
356 extern struct mdstat_ent
*mdstat_read(int hold
, int start
);
357 extern void free_mdstat(struct mdstat_ent
*ms
);
358 extern void mdstat_wait(int seconds
);
359 extern void mdstat_wait_fd(int fd
, const sigset_t
*sigmask
);
360 extern int mddev_busy(int devnum
);
363 struct map_ent
*next
;
370 extern int map_update(struct map_ent
**mpp
, int devnum
, char *metadata
,
371 int uuid
[4], char *path
);
372 extern struct map_ent
*map_by_uuid(struct map_ent
**map
, int uuid
[4]);
373 extern struct map_ent
*map_by_devnum(struct map_ent
**map
, int devnum
);
374 extern struct map_ent
*map_by_name(struct map_ent
**map
, char *name
);
375 extern void map_read(struct map_ent
**melp
);
376 extern int map_write(struct map_ent
*mel
);
377 extern void map_delete(struct map_ent
**mapp
, int devnum
);
378 extern void map_free(struct map_ent
*map
);
379 extern void map_add(struct map_ent
**melp
,
380 int devnum
, char *metadata
, int uuid
[4], char *path
);
381 extern int map_lock(struct map_ent
**melp
);
382 extern void map_unlock(struct map_ent
**melp
);
384 /* various details can be requested */
385 enum sysfs_read_flags
{
386 GET_LEVEL
= (1 << 0),
387 GET_LAYOUT
= (1 << 1),
388 GET_COMPONENT
= (1 << 2),
389 GET_CHUNK
= (1 << 3),
390 GET_CACHE
= (1 << 4),
391 GET_MISMATCH
= (1 << 5),
392 GET_VERSION
= (1 << 6),
393 GET_DISKS
= (1 << 7),
394 GET_DEGRADED
= (1 << 8),
395 GET_SAFEMODE
= (1 << 9),
396 GET_DEVS
= (1 << 10), /* gets role, major, minor */
397 GET_OFFSET
= (1 << 11),
398 GET_SIZE
= (1 << 12),
399 GET_STATE
= (1 << 13),
400 GET_ERROR
= (1 << 14),
401 SKIP_GONE_DEVS
= (1 << 15),
404 /* If fd >= 0, get the array it is open on,
405 * else use devnum. >=0 -> major9. <0.....
407 extern int sysfs_open(int devnum
, char *devname
, char *attr
);
408 extern void sysfs_init(struct mdinfo
*mdi
, int fd
, int devnum
);
409 extern void sysfs_free(struct mdinfo
*sra
);
410 extern struct mdinfo
*sysfs_read(int fd
, int devnum
, unsigned long options
);
411 extern int sysfs_attr_match(const char *attr
, const char *str
);
412 extern int sysfs_match_word(const char *word
, char **list
);
413 extern int sysfs_set_str(struct mdinfo
*sra
, struct mdinfo
*dev
,
414 char *name
, char *val
);
415 extern int sysfs_set_num(struct mdinfo
*sra
, struct mdinfo
*dev
,
416 char *name
, unsigned long long val
);
417 extern int sysfs_uevent(struct mdinfo
*sra
, char *event
);
418 extern int sysfs_get_fd(struct mdinfo
*sra
, struct mdinfo
*dev
,
420 extern int sysfs_fd_get_ll(int fd
, unsigned long long *val
);
421 extern int sysfs_get_ll(struct mdinfo
*sra
, struct mdinfo
*dev
,
422 char *name
, unsigned long long *val
);
423 extern int sysfs_fd_get_str(int fd
, char *val
, int size
);
424 extern int sysfs_get_str(struct mdinfo
*sra
, struct mdinfo
*dev
,
425 char *name
, char *val
, int size
);
426 extern int sysfs_set_safemode(struct mdinfo
*sra
, unsigned long ms
);
427 extern int sysfs_set_array(struct mdinfo
*info
, int vers
);
428 extern int sysfs_add_disk(struct mdinfo
*sra
, struct mdinfo
*sd
, int resume
);
429 extern int sysfs_disk_to_scsi_id(int fd
, __u32
*id
);
430 extern int sysfs_unique_holder(int devnum
, long rdev
);
431 extern int load_sys(char *path
, char *buf
);
434 extern int save_stripes(int *source
, unsigned long long *offsets
,
435 int raid_disks
, int chunk_size
, int level
, int layout
,
436 int nwrites
, int *dest
,
437 unsigned long long start
, unsigned long long length
,
439 extern int restore_stripes(int *dest
, unsigned long long *offsets
,
440 int raid_disks
, int chunk_size
, int level
, int layout
,
441 int source
, unsigned long long read_offset
,
442 unsigned long long start
, unsigned long long length
);
445 #define Sendmail "/usr/lib/sendmail -t"
448 #define SYSLOG_FACILITY LOG_DAEMON
450 extern char *map_num(mapping_t
*map
, int num
);
451 extern int map_name(mapping_t
*map
, char *name
);
452 extern mapping_t r5layout
[], r6layout
[], pers
[], modes
[], faultylayout
[];
454 extern char *map_dev(int major
, int minor
, int create
);
457 struct metadata_update
;
459 /* A superswitch provides entry point the a metadata handler.
461 * The super_switch primarily operates on some "metadata" that
462 * is accessed via the 'supertype'.
463 * This metadata has one of three possible sources.
464 * 1/ It is read from a single device. In this case it may not completely
465 * describe the array or arrays as some information might be on other
467 * 2/ It is read from all devices in a container. In this case all
468 * information is present.
469 * 3/ It is created by ->init_super / ->add_to_super. In this case it will
470 * be complete once enough ->add_to_super calls have completed.
472 * When creating an array inside a container, the metadata will be
473 * formed by a combination of 2 and 3. The metadata or the array is read,
474 * then new information is added.
476 * The metadata must sometimes have a concept of a 'current' array
477 * and a 'current' device.
478 * The 'current' array is set by init_super to be the newly created array,
479 * or is set by super_by_fd when it finds it is looking at an array inside
482 * The 'current' device is either the device that the metadata was read from
483 * in case 1, or the last device added by add_to_super in case 3.
484 * Case 2 does not identify a 'current' device.
486 extern struct superswitch
{
488 /* Used to report details of metadata read from a component
489 * device. ->load_super has been called.
491 void (*examine_super
)(struct supertype
*st
, char *homehost
);
492 void (*brief_examine_super
)(struct supertype
*st
, int verbose
);
493 void (*brief_examine_subarrays
)(struct supertype
*st
, int verbose
);
494 void (*export_examine_super
)(struct supertype
*st
);
496 /* Used to report details of an active array.
497 * ->load_super was possibly given a 'component' string.
499 void (*detail_super
)(struct supertype
*st
, char *homehost
);
500 void (*brief_detail_super
)(struct supertype
*st
);
501 void (*export_detail_super
)(struct supertype
*st
);
503 /* Optional: platform hardware / firmware details */
504 int (*detail_platform
)(int verbose
, int enumerate_only
);
507 * to get uuid to storing in bitmap metadata
508 * and 'reshape' backup-data metadata
509 * To see if a device is being re-added to an array it was part of.
511 void (*uuid_from_super
)(struct supertype
*st
, int uuid
[4]);
513 /* Extract generic details from metadata. This could be details about
514 * the container, or about an individual array within the container.
515 * The determination is made either by:
516 * load_super being given a 'component' string.
517 * validate_geometry determining what to create.
518 * The info includes both array information and device information.
519 * The particular device should be:
520 * The last device added by add_to_super
521 * The device the metadata was loaded from by load_super
523 void (*getinfo_super
)(struct supertype
*st
, struct mdinfo
*info
);
525 /* Check if the given metadata is flagged as belonging to "this"
526 * host. 0 for 'no', 1 for 'yes', -1 for "Don't record homehost"
528 int (*match_home
)(struct supertype
*st
, char *homehost
);
530 /* Make one of several generic modifications to metadata
531 * prior to assembly (or other times).
532 * sparc2.2 - first bug in early 0.90 metadata
533 * super-minor - change name of 0.90 metadata
534 * summaries - 'correct' any redundant data
535 * resync - mark array as dirty to trigger a resync.
536 * uuid - set new uuid - only 0.90 or 1.x
537 * name - change the name of the array (where supported)
538 * homehost - change which host this array is tied to.
539 * devicesize - If metadata is at start of device, change recorded
540 * device size to match actual device size
541 * byteorder - swap bytes for 0.90 metadata
543 * force-one - mark that device as uptodate, not old or failed.
544 * force-array - mark array as clean if it would not otherwise
546 * assemble - not sure how this is different from force-one...
547 * linear-grow-new - add a new device to a linear array, but don't
548 * change the size: so superblock still matches
549 * linear-grow-update - now change the size of the array.
551 int (*update_super
)(struct supertype
*st
, struct mdinfo
*info
,
553 char *devname
, int verbose
,
554 int uuid_set
, char *homehost
);
556 /* Create new metadata for new array as described. This could
557 * be a new container, or an array in a pre-existing container.
558 * Also used to zero metadata prior to writing it to invalidate old
561 int (*init_super
)(struct supertype
*st
, mdu_array_info_t
*info
,
562 unsigned long long size
, char *name
,
563 char *homehost
, int *uuid
);
565 /* update the metadata to include new device, either at create or
566 * when hot-adding a spare.
568 int (*add_to_super
)(struct supertype
*st
, mdu_disk_info_t
*dinfo
,
569 int fd
, char *devname
);
571 /* Write metadata to one device when fixing problems or adding
574 int (*store_super
)(struct supertype
*st
, int fd
);
576 /* Write all metadata for this array.
578 int (*write_init_super
)(struct supertype
*st
);
579 int (*compare_super
)(struct supertype
*st
, struct supertype
*tst
);
580 int (*load_super
)(struct supertype
*st
, int fd
, char *devname
);
581 struct supertype
* (*match_metadata_desc
)(char *arg
);
582 __u64 (*avail_size
)(struct supertype
*st
, __u64 size
);
583 int (*add_internal_bitmap
)(struct supertype
*st
, int *chunkp
,
584 int delay
, int write_behind
,
585 unsigned long long size
, int may_change
, int major
);
586 void (*locate_bitmap
)(struct supertype
*st
, int fd
);
587 int (*write_bitmap
)(struct supertype
*st
, int fd
);
588 void (*free_super
)(struct supertype
*st
);
590 /* validate_geometry is called with an st returned by
591 * match_metadata_desc.
592 * It should check that the geometry described in compatible with
593 * the metadata type. It will be called repeatedly as devices
594 * added to validate changing size and new devices. If there are
595 * inter-device dependencies, it should record sufficient details
596 * so these can be validated.
597 * Both 'size' and '*freesize' are in sectors. chunk is bytes.
599 int (*validate_geometry
)(struct supertype
*st
, int level
, int layout
,
601 int chunk
, unsigned long long size
,
602 char *subdev
, unsigned long long *freesize
,
605 struct mdinfo
*(*container_content
)(struct supertype
*st
);
606 /* Allow a metadata handler to override mdadm's default layouts */
607 int (*default_layout
)(int level
); /* optional */
610 int (*open_new
)(struct supertype
*c
, struct active_array
*a
,
613 /* Tell the metadata handler the current state of the array.
614 * This covers whether it is known to be consistent (no pending writes)
615 * and how far along a resync is known to have progressed
616 * (in a->resync_start).
617 * resync status is really irrelevant if the array is not consistent,
618 * but some metadata (DDF!) have a place to record the distinction.
619 * If 'consistent' is '2', then the array can mark it dirty if a
620 * resync/recovery/whatever is required, or leave it clean if not.
621 * Return value is 0 dirty (not consistent) and 1 if clean.
622 * it is only really important if consistent is passed in as '2'.
624 int (*set_array_state
)(struct active_array
*a
, int consistent
);
626 /* When the state of a device might have changed, we call set_disk to
627 * tell the metadata what the current state is.
628 * Typically this happens on spare->in_sync and (spare|in_sync)->faulty
630 * set_disk might be called when the state of the particular disk has
631 * not in fact changed.
633 void (*set_disk
)(struct active_array
*a
, int n
, int state
);
634 void (*sync_metadata
)(struct supertype
*st
);
635 void (*process_update
)(struct supertype
*st
,
636 struct metadata_update
*update
);
637 void (*prepare_update
)(struct supertype
*st
,
638 struct metadata_update
*update
);
640 /* activate_spare will check if the array is degraded and, if it
641 * is, try to find some spare space in the container.
642 * On success, it add appropriate updates (For process_update) to
643 * to the 'updates' list and returns a list of 'mdinfo' identifying
644 * the device, or devices as there might be multiple missing
645 * devices and multiple spares available.
647 struct mdinfo
*(*activate_spare
)(struct active_array
*a
,
648 struct metadata_update
**updates
);
650 int swapuuid
; /* true if uuid is bigending rather than hostendian */
652 const char *name
; /* canonical metadata name */
653 } super0
, super1
, super_ddf
, *superlist
[];
655 extern struct superswitch super_imsm
;
657 struct metadata_update
{
660 void *space
; /* allocated space that monitor will use */
661 struct metadata_update
*next
;
664 /* A supertype holds a particular collection of metadata.
665 * It identifies the metadata type by the superswitch, and the particular
666 * sub-version of that metadata type.
667 * metadata read in or created is stored in 'sb' and 'info'.
668 * There are also fields used by mdmon to track containers.
670 * A supertype may refer to:
671 * Just an array, possibly in a container
672 * A container, not identifying any particular array
673 * Info read from just one device, not yet fully describing the array/container.
676 * A supertype is created by:
682 struct superswitch
*ss
;
685 int container_dev
; /* devnum of container */
686 char subarray
[32]; /* name of array inside container */
689 int loaded_container
; /* Set if load_super found a container,
690 * not just one device */
692 struct metadata_update
*updates
;
693 struct metadata_update
**update_tail
;
695 /* extra stuff used by mdmon */
696 struct active_array
*arrays
;
697 int sock
; /* listen to external programs */
699 char *devname
; /* e.g. md0. This appears in metadata_verison:
708 extern struct supertype
*super_by_fd(int fd
);
709 extern struct supertype
*guess_super(int fd
);
710 extern struct supertype
*dup_super(struct supertype
*st
);
711 extern int get_dev_size(int fd
, char *dname
, unsigned long long *sizep
);
712 extern void get_one_disk(int mdfd
, mdu_array_info_t
*ainf
,
713 mdu_disk_info_t
*disk
);
714 void wait_for(char *dev
, int fd
);
720 #define HAVE_NFTW we assume
724 # include <features.h>
725 # ifndef __UCLIBC_HAS_LFS__
726 # define lseek64 lseek
728 # ifndef __UCLIBC_HAS_FTW__
738 #if defined(__KLIBC__)
754 extern int add_dev(const char *name
, const struct stat
*stb
, int flag
, struct FTW
*s
);
757 extern int Manage_ro(char *devname
, int fd
, int readonly
);
758 extern int Manage_runstop(char *devname
, int fd
, int runstop
, int quiet
);
759 extern int Manage_resize(char *devname
, int fd
, long long size
, int raid_disks
);
760 extern int Manage_subdevs(char *devname
, int fd
,
761 mddev_dev_t devlist
, int verbose
);
762 extern int autodetect(void);
763 extern int Grow_Add_device(char *devname
, int fd
, char *newdev
);
764 extern int Grow_addbitmap(char *devname
, int fd
, char *file
, int chunk
, int delay
, int write_behind
, int force
);
765 extern int Grow_reshape(char *devname
, int fd
, int quiet
, char *backup_file
,
767 int level
, char *layout_str
, int chunksize
, int raid_disks
);
768 extern int Grow_restart(struct supertype
*st
, struct mdinfo
*info
,
769 int *fdlist
, int cnt
, char *backup_file
, int verbose
);
770 extern int Grow_continue(int mdfd
, struct supertype
*st
,
771 struct mdinfo
*info
, char *backup_file
);
773 extern int Assemble(struct supertype
*st
, char *mddev
,
775 mddev_dev_t devlist
, char *backup_file
,
776 int readonly
, int runstop
,
777 char *update
, char *homehost
, int require_homehost
,
778 int verbose
, int force
);
780 extern int Build(char *mddev
, int chunk
, int level
, int layout
,
781 int raiddisks
, mddev_dev_t devlist
, int assume_clean
,
782 char *bitmap_file
, int bitmap_chunk
, int write_behind
,
783 int delay
, int verbose
, int autof
, unsigned long long size
);
786 extern int Create(struct supertype
*st
, char *mddev
,
787 int chunk
, int level
, int layout
, unsigned long long size
, int raiddisks
, int sparedisks
,
788 char *name
, char *homehost
, int *uuid
,
789 int subdevs
, mddev_dev_t devlist
,
790 int runstop
, int verbose
, int force
, int assume_clean
,
791 char *bitmap_file
, int bitmap_chunk
, int write_behind
, int delay
, int autof
);
793 extern int Detail(char *dev
, int brief
, int export
, int test
, char *homehost
);
794 extern int Detail_Platform(struct superswitch
*ss
, int scan
, int verbose
);
795 extern int Query(char *dev
);
796 extern int Examine(mddev_dev_t devlist
, int brief
, int export
, int scan
,
797 int SparcAdjust
, struct supertype
*forcest
, char *homehost
);
798 extern int Monitor(mddev_dev_t devlist
,
799 char *mailaddr
, char *alert_cmd
,
800 int period
, int daemonise
, int scan
, int oneshot
,
801 int dosyslog
, int test
, char *pidfile
, int increments
);
803 extern int Kill(char *dev
, struct supertype
*st
, int force
, int quiet
, int noexcl
);
804 extern int Wait(char *dev
);
805 extern int WaitClean(char *dev
, int sock
, int verbose
);
807 extern int Incremental(char *devname
, int verbose
, int runstop
,
808 struct supertype
*st
, char *homehost
, int require_homehost
,
810 extern int Incremental_container(struct supertype
*st
, char *devname
,
811 int verbose
, int runstop
, int autof
,
813 extern void RebuildMap(void);
814 extern int IncrementalScan(int verbose
);
816 extern int CreateBitmap(char *filename
, int force
, char uuid
[16],
817 unsigned long chunksize
, unsigned long daemon_sleep
,
818 unsigned long write_behind
,
819 unsigned long long array_size
,
821 extern int ExamineBitmap(char *filename
, int brief
, struct supertype
*st
);
822 extern int bitmap_update_uuid(int fd
, int *uuid
, int swap
);
823 extern unsigned long bitmap_sectors(struct bitmap_super_s
*bsb
);
825 extern int md_get_version(int fd
);
826 extern int get_linux_version(void);
827 extern long long parse_size(char *size
);
828 extern int parse_uuid(char *str
, int uuid
[4]);
829 extern int parse_layout_10(char *layout
);
830 extern int parse_layout_faulty(char *layout
);
831 extern int check_ext2(int fd
, char *name
);
832 extern int check_reiser(int fd
, char *name
);
833 extern int check_raid(int fd
, char *name
);
834 extern int check_partitions(int fd
, char *dname
, unsigned long long freesize
);
836 extern int get_mdp_major(void);
837 extern int dev_open(char *dev
, int flags
);
838 extern int open_dev(int devnum
);
839 extern int open_dev_excl(int devnum
);
840 extern int is_standard(char *dev
, int *nump
);
841 extern int same_dev(char *one
, char *two
);
843 extern int parse_auto(char *str
, char *msg
, int config
);
844 extern mddev_ident_t
conf_get_ident(char *dev
);
845 extern mddev_dev_t
conf_get_devs(void);
846 extern int conf_test_dev(char *devname
);
847 extern int conf_test_metadata(const char *version
, int is_homehost
);
848 extern struct createinfo
*conf_get_create_info(void);
849 extern void set_conffile(char *file
);
850 extern char *conf_get_mailaddr(void);
851 extern char *conf_get_mailfrom(void);
852 extern char *conf_get_program(void);
853 extern char *conf_get_homehost(int *require_homehostp
);
854 extern char *conf_line(FILE *file
);
855 extern char *conf_word(FILE *file
, int allow_key
);
856 extern int conf_name_is_free(char *name
);
857 extern int devname_matches(char *name
, char *match
);
858 extern struct mddev_ident_s
*conf_match(struct mdinfo
*info
, struct supertype
*st
);
860 extern void free_line(char *line
);
861 extern int match_oneof(char *devices
, char *devname
);
862 extern void uuid_from_super(int uuid
[4], mdp_super_t
*super
);
863 extern const int uuid_match_any
[4];
864 extern int same_uuid(int a
[4], int b
[4], int swapuuid
);
865 extern void copy_uuid(void *a
, int b
[4], int swapuuid
);
866 extern char *__fname_from_uuid(int id
[4], int swap
, char *buf
, char sep
);
867 extern char *fname_from_uuid(struct supertype
*st
,
868 struct mdinfo
*info
, char *buf
, char sep
);
869 extern unsigned long calc_csum(void *super
, int bytes
);
870 extern int enough(int level
, int raid_disks
, int layout
, int clean
,
871 char *avail
, int avail_disks
);
872 extern int ask(char *mesg
);
873 extern unsigned long long get_component_size(int fd
);
874 extern void remove_partitions(int fd
);
875 extern unsigned long long calc_array_size(int level
, int raid_disks
, int layout
,
876 int chunksize
, unsigned long long devsize
);
877 extern int flush_metadata_updates(struct supertype
*st
);
878 extern void append_metadata_update(struct supertype
*st
, void *buf
, int len
);
879 extern int assemble_container_content(struct supertype
*st
, int mdfd
,
880 struct mdinfo
*content
, int runstop
,
881 char *chosen_name
, int verbose
);
883 extern int add_disk(int mdfd
, struct supertype
*st
,
884 struct mdinfo
*sra
, struct mdinfo
*info
);
885 extern int set_array_info(int mdfd
, struct supertype
*st
, struct mdinfo
*info
);
886 unsigned long long min_recovery_start(struct mdinfo
*array
);
888 extern char *human_size(long long bytes
);
889 extern char *human_size_brief(long long bytes
);
890 extern void print_r10_layout(int layout
);
892 #define NoMdDev (1<<23)
893 extern int find_free_devnum(int use_partitions
);
895 extern void put_md_name(char *name
);
896 extern char *get_md_name(int dev
);
898 extern char DefaultConfFile
[];
900 extern int create_mddev(char *dev
, char *name
, int autof
, int trustworthy
,
902 /* values for 'trustworthy' */
907 extern int open_mddev(char *dev
, int report_errors
);
908 extern int open_container(int fd
);
910 extern char *pid_dir
;
911 extern int mdmon_running(int devnum
);
912 extern int mdmon_pid(int devnum
);
913 extern int check_env(char *name
);
914 extern __u32
random32(void);
915 extern int start_mdmon(int devnum
);
917 extern char *devnum2devname(int num
);
918 extern int devname2devnum(char *name
);
919 extern int stat2devnum(struct stat
*st
);
920 extern int fd2devnum(int fd
);
922 static inline int dev2major(int d
)
927 return get_mdp_major();
930 static inline int dev2minor(int d
)
934 return (-1-d
) << MdpMinorShift
;
937 static inline int ROUND_UP(int a
, int base
)
939 return ((a
+base
-1)/base
)*base
;
942 static inline int is_subarray(char *vers
)
944 /* The version string for a 'subarray' (an array in a container)
946 * /containername/componentname for normal read-write arrays
947 * -containername/componentname for read-only arrays.
948 * containername is e.g. md0, md_d1
949 * componentname is dependant on the metadata. e.g. '1' 'S1' ...
951 return (*vers
== '/' || *vers
== '-');
955 #define dprintf(fmt, arg...) \
956 fprintf(stderr, fmt, ##arg)
958 #define dprintf(fmt, arg...) \
959 ({ if (0) fprintf(stderr, fmt, ##arg); 0; })
963 static inline int xasprintf(char **strp
, const char *fmt
, ...) {
967 ret
= vasprintf(strp
, fmt
, ap
);
973 #define LEVEL_MULTIPATH (-4)
974 #define LEVEL_LINEAR (-1)
975 #define LEVEL_FAULTY (-5)
977 /* kernel module doesn't know about these */
978 #define LEVEL_CONTAINER (-100)
979 #define LEVEL_UNSUPPORTED (-200)
984 #define WriteTransient 0
985 #define ReadTransient 1
986 #define WritePersistent 2
987 #define ReadPersistent 3
988 #define WriteAll 4 /* doesn't go to device */
989 #define ReadFixable 5
992 #define ClearErrors 31
993 #define ClearFaults 30
995 #define AllPersist 100 /* internal use only */
996 #define NoPersist 101
998 #define ModeMask 0x1f
1006 #define minor(x) ((x)&0xff)
1007 #define major(x) (((x)>>8)&0xff)
1008 #define makedev(M,m) (((M)<<8) | (m))
1012 #define ALGORITHM_LEFT_ASYMMETRIC 0
1013 #define ALGORITHM_RIGHT_ASYMMETRIC 1
1014 #define ALGORITHM_LEFT_SYMMETRIC 2
1015 #define ALGORITHM_RIGHT_SYMMETRIC 3
1017 /* Define non-rotating (raid4) algorithms. These allow
1018 * conversion of raid4 to raid5.
1020 #define ALGORITHM_PARITY_0 4 /* P or P,Q are initial devices */
1021 #define ALGORITHM_PARITY_N 5 /* P or P,Q are final devices. */
1023 /* DDF RAID6 layouts differ from md/raid6 layouts in two ways.
1024 * Firstly, the exact positioning of the parity block is slightly
1025 * different between the 'LEFT_*' modes of md and the "_N_*" modes
1027 * Secondly, or order of datablocks over which the Q syndrome is computed
1029 * Consequently we have different layouts for DDF/raid6 than md/raid6.
1030 * These layouts are from the DDFv1.2 spec.
1031 * Interestingly DDFv1.2-Errata-A does not specify N_CONTINUE but
1032 * leaves RLQ=3 as 'Vendor Specific'
1035 #define ALGORITHM_ROTATING_ZERO_RESTART 8 /* DDF PRL=6 RLQ=1 */
1036 #define ALGORITHM_ROTATING_N_RESTART 9 /* DDF PRL=6 RLQ=2 */
1037 #define ALGORITHM_ROTATING_N_CONTINUE 10 /*DDF PRL=6 RLQ=3 */
1040 /* For every RAID5 algorithm we define a RAID6 algorithm
1041 * with exactly the same layout for data and parity, and
1042 * with the Q block always on the last device (N-1).
1043 * This allows trivial conversion from RAID5 to RAID6
1045 #define ALGORITHM_LEFT_ASYMMETRIC_6 16
1046 #define ALGORITHM_RIGHT_ASYMMETRIC_6 17
1047 #define ALGORITHM_LEFT_SYMMETRIC_6 18
1048 #define ALGORITHM_RIGHT_SYMMETRIC_6 19
1049 #define ALGORITHM_PARITY_0_6 20
1050 #define ALGORITHM_PARITY_N_6 ALGORITHM_PARITY_N
1052 /* Define PATH_MAX in case we don't use glibc or standard library does
1053 * not have PATH_MAX defined. Assume max path length is 4K characters.
1056 #define PATH_MAX 4096