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 /* Newer glibc requires sys/sysmacros.h directly for makedev() */
50 #include <sys/sysmacros.h>
54 /* dietlibc has deprecated random and srandom!! */
61 typedef uint64_t cmap_handle_t
;
63 #include <corosync/cmap.h>
70 #define LKF_NOQUEUE 0x00000001
72 #define EUNLOCK 0x10002
74 typedef void *dlm_lshandle_t
;
84 #include <linux/kdev_t.h>
85 /*#include <linux/fs.h> */
86 #include <sys/mount.h>
87 #include <asm/types.h>
88 #include <sys/ioctl.h>
90 #define MdpMinorShift 6
93 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
96 #define DEFAULT_CHUNK 512
97 #define DEFAULT_BITMAP_CHUNK 4096
98 #define DEFAULT_BITMAP_DELAY 5
99 #define DEFAULT_MAX_WRITE_BEHIND 256
101 /* MAP_DIR should be somewhere that persists across the pivotroot
102 * from early boot to late boot.
103 * /run seems to have emerged as the best standard.
106 #define MAP_DIR "/run/mdadm"
108 /* MAP_FILE is what we name the map file we put in MAP_DIR, in case you
109 * want something other than the default of "map"
112 #define MAP_FILE "map"
113 #endif /* MAP_FILE */
114 /* MDMON_DIR is where pid and socket files used for communicating
115 * with mdmon normally live. Best is /var/run/mdadm as
116 * mdmon is needed at early boot then it needs to write there prior
117 * to /var/run being mounted read/write, and it also then needs to
118 * persist beyond when /var/run is mounter read-only. So, to be
119 * safe, the default is somewhere that is read/write early in the
120 * boot process and stays up as long as possible during shutdown.
123 #define MDMON_DIR "/run/mdadm"
124 #endif /* MDMON_DIR */
126 /* FAILED_SLOTS is where to save files storing recent removal of array
127 * member in order to allow future reuse of disk inserted in the same
128 * slot for array recovery
130 #ifndef FAILED_SLOTS_DIR
131 #define FAILED_SLOTS_DIR "/run/mdadm/failed-slots"
132 #endif /* FAILED_SLOTS */
140 /* Redhat don't like to #include <asm/byteorder.h>, and
141 * some time include <linux/byteorder/xxx_endian.h> isn't enough,
142 * and there is no standard conversion function so... */
143 /* And dietlibc doesn't think byteswap is ok, so.. */
144 /* #include <byteswap.h> */
145 #define __mdadm_bswap_16(x) (((x) & 0x00ffU) << 8 | \
146 ((x) & 0xff00U) >> 8)
147 #define __mdadm_bswap_32(x) (((x) & 0x000000ffU) << 24 | \
148 ((x) & 0xff000000U) >> 24 | \
149 ((x) & 0x0000ff00U) << 8 | \
150 ((x) & 0x00ff0000U) >> 8)
151 #define __mdadm_bswap_64(x) (((x) & 0x00000000000000ffULL) << 56 | \
152 ((x) & 0xff00000000000000ULL) >> 56 | \
153 ((x) & 0x000000000000ff00ULL) << 40 | \
154 ((x) & 0x00ff000000000000ULL) >> 40 | \
155 ((x) & 0x0000000000ff0000ULL) << 24 | \
156 ((x) & 0x0000ff0000000000ULL) >> 24 | \
157 ((x) & 0x00000000ff000000ULL) << 8 | \
158 ((x) & 0x000000ff00000000ULL) >> 8)
160 #if !defined(__KLIBC__)
161 #if BYTE_ORDER == LITTLE_ENDIAN
162 #define __cpu_to_le16(_x) (unsigned int)(_x)
163 #define __cpu_to_le32(_x) (unsigned int)(_x)
164 #define __cpu_to_le64(_x) (unsigned long long)(_x)
165 #define __le16_to_cpu(_x) (unsigned int)(_x)
166 #define __le32_to_cpu(_x) (unsigned int)(_x)
167 #define __le64_to_cpu(_x) (unsigned long long)(_x)
169 #define __cpu_to_be16(_x) __mdadm_bswap_16(_x)
170 #define __cpu_to_be32(_x) __mdadm_bswap_32(_x)
171 #define __cpu_to_be64(_x) __mdadm_bswap_64(_x)
172 #define __be16_to_cpu(_x) __mdadm_bswap_16(_x)
173 #define __be32_to_cpu(_x) __mdadm_bswap_32(_x)
174 #define __be64_to_cpu(_x) __mdadm_bswap_64(_x)
175 #elif BYTE_ORDER == BIG_ENDIAN
176 #define __cpu_to_le16(_x) __mdadm_bswap_16(_x)
177 #define __cpu_to_le32(_x) __mdadm_bswap_32(_x)
178 #define __cpu_to_le64(_x) __mdadm_bswap_64(_x)
179 #define __le16_to_cpu(_x) __mdadm_bswap_16(_x)
180 #define __le32_to_cpu(_x) __mdadm_bswap_32(_x)
181 #define __le64_to_cpu(_x) __mdadm_bswap_64(_x)
183 #define __cpu_to_be16(_x) (unsigned int)(_x)
184 #define __cpu_to_be32(_x) (unsigned int)(_x)
185 #define __cpu_to_be64(_x) (unsigned long long)(_x)
186 #define __be16_to_cpu(_x) (unsigned int)(_x)
187 #define __be32_to_cpu(_x) (unsigned int)(_x)
188 #define __be64_to_cpu(_x) (unsigned long long)(_x)
190 # error "unknown endianness."
192 #endif /* __KLIBC__ */
195 * Check at compile time that something is of a particular type.
196 * Always evaluates to 1 so you may use it easily in comparisons.
199 #define typecheck(type,x) \
201 typeof(x) __dummy2; \
202 (void)(&__dummy == &__dummy2); \
207 * These inlines deal with timer wrapping correctly.
209 * time_after(a,b) returns true if the time a is after time b.
212 #define time_after(a,b) \
213 (typecheck(unsigned int, a) && \
214 typecheck(unsigned int, b) && \
215 ((int)((b) - (a)) < 0))
217 #define time_before(a,b) time_after(b,a)
220 * min()/max()/clamp() macros that also do
221 * strict type-checking.. See the
222 * "unnecessary" pointer comparison.
224 #define min(x, y) ({ \
225 typeof(x) _min1 = (x); \
226 typeof(y) _min2 = (y); \
227 (void) (&_min1 == &_min2); \
228 _min1 < _min2 ? _min1 : _min2; })
230 #define max(x, y) ({ \
231 typeof(x) _max1 = (x); \
232 typeof(y) _max2 = (y); \
233 (void) (&_max1 == &_max2); \
234 _max1 > _max2 ? _max1 : _max2; })
236 #define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
238 extern const char Name
[];
241 unsigned long long sector
;
248 struct md_bb_entry
*entries
;
251 /* general information that might be extracted from a superblock */
253 mdu_array_info_t array
;
254 mdu_disk_info_t disk
;
258 unsigned long long data_offset
;
259 unsigned long long new_data_offset
;
260 unsigned long long component_size
; /* same as array.size, except in
261 * sectors and up to 64bits.
263 unsigned long long custom_array_size
; /* size for non-default sized
264 * arrays (in sectors)
267 #define VOLUME_RESHAPE 1
268 #define CONTAINER_RESHAPE 2
269 #define RESHAPE_NO_BACKUP 16 /* Mask 'or'ed in */
271 unsigned long long reshape_progress
;
272 int recovery_blocked
; /* for external metadata it
273 * indicates that there is
274 * reshape in progress in
276 * for native metadata it is
277 * reshape_active field mirror
279 int journal_device_required
;
282 /* During reshape we can sometimes change the data_offset to avoid
283 * over-writing still-valid data. We need to know if there is space.
284 * So getinfo_super will fill in space_before and space_after in sectors.
285 * data_offset can be increased or decreased by this amount.
287 unsigned long long space_before
, space_after
;
289 unsigned long long resync_start
; /* per-array resync position */
290 unsigned long long recovery_start
; /* per-device rebuild position */
291 #define MaxSector (~0ULL) /* resync/recovery complete position */
293 long bitmap_offset
; /* 0 == none, 1 == a file */
294 unsigned long safe_mode_delay
; /* ms delay to mark clean */
295 int new_level
, delta_disks
, new_layout
, new_chunk
;
297 unsigned long cache_size
; /* size of raid456 stripe cache*/
299 char text_version
[50];
301 int container_member
; /* for assembling external-metatdata arrays
302 * This is to be used internally by metadata
304 int container_enough
; /* flag external handlers can set to
305 * indicate that subarrays have not enough (-1),
306 * enough to start (0), or all expected disks (1) */
311 /* Device info for mdmon: */
318 #define DS_WRITE_MOSTLY 4
320 #define DS_BLOCKED 16
321 #define DS_REMOVE 1024
322 #define DS_UNBLOCK 2048
323 int prev_state
, curr_state
, next_state
;
325 /* info read from sysfs */
326 char sysfs_array_state
[20];
339 struct supertype
*supertype
;
355 extern char short_options
[];
356 extern char short_bitmap_options
[];
357 extern char short_bitmap_auto_options
[];
358 extern struct option long_options
[];
359 extern char Version
[], Usage
[], Help
[], OptionHelp
[],
361 Help_create
[], Help_build
[], Help_assemble
[], Help_grow
[],
363 Help_manage
[], Help_misc
[], Help_monitor
[], Help_config
[];
365 /* for option that don't have short equivilents, we assign arbitrary
366 * numbers later than any 'short' character option.
368 enum special_options
{
431 enum prefix_standard
{
442 /* structures read from config file */
443 /* List of mddevice names and identifiers
444 * Identifiers can be:
446 * super-minor=decimal-minor-number-from-superblock
447 * devices=comma,separated,list,of,device,names,with,wildcards
449 * If multiple fields are present, the intersection of all matching
450 * devices is considered
452 #define UnSet (0xfffe)
462 char *devices
; /* comma separated list of device
463 * names with wild cards
468 struct supertype
*st
;
469 int autof
; /* 1 for normal, 2 for partitioned */
474 char *container
; /* /dev/whatever name of container, or
475 * uuid of container. You would expect
476 * this to be the 'devname' or UUID
477 * of some other entry.
479 char *member
; /* subarray within a container */
481 struct mddev_ident
*next
;
483 /* fields needed by different users of this structure */
484 int assembled
; /* set when assembly succeeds */
495 int require_homehost
;
525 unsigned long long size
;
528 /* List of device names - wildcards expanded */
531 int disposition
; /* 'a' for add, 'r' for remove, 'f' for fail,
533 * Not set for names read from .config
535 char writemostly
; /* 1 for 'set writemostly', 2 for 'clear writemostly' */
536 char failfast
; /* Ditto but for 'failfast' flag */
537 int used
; /* set when used */
538 long long data_offset
;
539 struct mddev_dev
*next
;
542 typedef struct mapping
{
551 char *pattern
; /* U or up, _ for down */
552 int percent
; /* -1 if no resync */
553 int resync
; /* 3 if check, 2 if reshape, 1 if resync, 0 if recovery */
556 char * metadata_version
;
559 struct dev_member
*next
;
561 struct mdstat_ent
*next
;
564 extern struct mdstat_ent
*mdstat_read(int hold
, int start
);
565 extern void mdstat_close(void);
566 extern void free_mdstat(struct mdstat_ent
*ms
);
567 extern void mdstat_wait(int seconds
);
568 extern void mdstat_wait_fd(int fd
, const sigset_t
*sigmask
);
569 extern int mddev_busy(char *devnm
);
570 extern struct mdstat_ent
*mdstat_by_component(char *name
);
571 extern struct mdstat_ent
*mdstat_by_subdev(char *subdev
, char *container
);
574 struct map_ent
*next
;
581 extern int map_update(struct map_ent
**mpp
, char *devnm
, char *metadata
,
582 int uuid
[4], char *path
);
583 extern void map_remove(struct map_ent
**map
, char *devnm
);
584 extern struct map_ent
*map_by_uuid(struct map_ent
**map
, int uuid
[4]);
585 extern struct map_ent
*map_by_devnm(struct map_ent
**map
, char *devnm
);
586 extern void map_free(struct map_ent
*map
);
587 extern struct map_ent
*map_by_name(struct map_ent
**map
, char *name
);
588 extern void map_read(struct map_ent
**melp
);
589 extern int map_write(struct map_ent
*mel
);
590 extern void map_delete(struct map_ent
**mapp
, char *devnm
);
591 extern void map_add(struct map_ent
**melp
,
592 char *devnm
, char *metadata
, int uuid
[4], char *path
);
593 extern int map_lock(struct map_ent
**melp
);
594 extern void map_unlock(struct map_ent
**melp
);
595 extern void map_fork(void);
597 /* various details can be requested */
598 enum sysfs_read_flags
{
599 GET_LEVEL
= (1 << 0),
600 GET_LAYOUT
= (1 << 1),
601 GET_COMPONENT
= (1 << 2),
602 GET_CHUNK
= (1 << 3),
603 GET_CACHE
= (1 << 4),
604 GET_MISMATCH
= (1 << 5),
605 GET_VERSION
= (1 << 6),
606 GET_DISKS
= (1 << 7),
607 GET_DEGRADED
= (1 << 8),
608 GET_SAFEMODE
= (1 << 9),
609 GET_BITMAP_LOCATION
= (1 << 10),
611 GET_DEVS
= (1 << 20), /* gets role, major, minor */
612 GET_OFFSET
= (1 << 21),
613 GET_SIZE
= (1 << 22),
614 GET_STATE
= (1 << 23),
615 GET_ERROR
= (1 << 24),
616 GET_ARRAY_STATE
= (1 << 25),
619 /* If fd >= 0, get the array it is open on,
622 extern int sysfs_open(char *devnm
, char *devname
, char *attr
);
623 extern void sysfs_init(struct mdinfo
*mdi
, int fd
, char *devnm
);
624 extern void sysfs_init_dev(struct mdinfo
*mdi
, unsigned long devid
);
625 extern void sysfs_free(struct mdinfo
*sra
);
626 extern struct mdinfo
*sysfs_read(int fd
, char *devnm
, unsigned long options
);
627 extern int sysfs_attr_match(const char *attr
, const char *str
);
628 extern int sysfs_match_word(const char *word
, char **list
);
629 extern int sysfs_set_str(struct mdinfo
*sra
, struct mdinfo
*dev
,
630 char *name
, char *val
);
631 extern int sysfs_set_num(struct mdinfo
*sra
, struct mdinfo
*dev
,
632 char *name
, unsigned long long val
);
633 extern int sysfs_set_num_signed(struct mdinfo
*sra
, struct mdinfo
*dev
,
634 char *name
, long long val
);
635 extern int sysfs_uevent(struct mdinfo
*sra
, char *event
);
636 extern int sysfs_get_fd(struct mdinfo
*sra
, struct mdinfo
*dev
,
638 extern int sysfs_fd_get_ll(int fd
, unsigned long long *val
);
639 extern int sysfs_get_ll(struct mdinfo
*sra
, struct mdinfo
*dev
,
640 char *name
, unsigned long long *val
);
641 extern int sysfs_fd_get_two(int fd
, unsigned long long *v1
, unsigned long long *v2
);
642 extern int sysfs_get_two(struct mdinfo
*sra
, struct mdinfo
*dev
,
643 char *name
, unsigned long long *v1
, unsigned long long *v2
);
644 extern int sysfs_fd_get_str(int fd
, char *val
, int size
);
645 extern int sysfs_attribute_available(struct mdinfo
*sra
, struct mdinfo
*dev
,
647 extern int sysfs_get_str(struct mdinfo
*sra
, struct mdinfo
*dev
,
648 char *name
, char *val
, int size
);
649 extern int sysfs_set_safemode(struct mdinfo
*sra
, unsigned long ms
);
650 extern int sysfs_set_array(struct mdinfo
*info
, int vers
);
651 extern int sysfs_add_disk(struct mdinfo
*sra
, struct mdinfo
*sd
, int resume
);
652 extern int sysfs_disk_to_scsi_id(int fd
, __u32
*id
);
653 extern int sysfs_unique_holder(char *devnm
, long rdev
);
654 extern int sysfs_freeze_array(struct mdinfo
*sra
);
655 extern int sysfs_wait(int fd
, int *msec
);
656 extern int load_sys(char *path
, char *buf
, int len
);
657 extern int reshape_prepare_fdlist(char *devname
,
661 unsigned long blocks
,
664 unsigned long long *offsets
);
665 extern void reshape_free_fdlist(int *fdlist
,
666 unsigned long long *offsets
,
668 extern int reshape_open_backup_file(char *backup
,
673 unsigned long long *offsets
,
676 extern unsigned long compute_backup_blocks(int nchunk
, int ochunk
,
677 unsigned int ndata
, unsigned int odata
);
678 extern char *locate_backup(char *name
);
679 extern char *make_backup(char *name
);
681 extern int save_stripes(int *source
, unsigned long long *offsets
,
682 int raid_disks
, int chunk_size
, int level
, int layout
,
683 int nwrites
, int *dest
,
684 unsigned long long start
, unsigned long long length
,
686 extern int restore_stripes(int *dest
, unsigned long long *offsets
,
687 int raid_disks
, int chunk_size
, int level
, int layout
,
688 int source
, unsigned long long read_offset
,
689 unsigned long long start
, unsigned long long length
,
693 #define Sendmail "/usr/lib/sendmail -t"
696 #define SYSLOG_FACILITY LOG_DAEMON
698 extern char *map_num(mapping_t
*map
, int num
);
699 extern int map_name(mapping_t
*map
, char *name
);
700 extern mapping_t r5layout
[], r6layout
[], pers
[], modes
[], faultylayout
[];
702 extern char *map_dev_preferred(int major
, int minor
, int create
,
704 static inline char *map_dev(int major
, int minor
, int create
)
706 return map_dev_preferred(major
, minor
, create
, NULL
);
710 struct metadata_update
;
712 /* 'struct reshape' records the intermediate states of
714 * The starting geometry is converted to the 'before' geometry
715 * by at most an atomic level change. They could be the same.
716 * Similarly the 'after' geometry is converted to the final
717 * geometry by at most a level change.
718 * Note that 'before' and 'after' must have the same level.
719 * 'blocks' is the minimum number of sectors for a reshape unit.
720 * This will be a multiple of the stripe size in each of the
721 * 'before' and 'after' geometries.
722 * If 'blocks' is 0, no restriping is necessary.
723 * 'min_offset_change' is the minimum change to data_offset to
724 * allow the reshape to happen. It is at least the larger of
725 * the old and new chunk sizes, and typically the same as 'blocks'
726 * divided by number of data disks.
730 int parity
; /* number of parity blocks/devices */
735 unsigned long long backup_blocks
;
736 unsigned long long min_offset_change
;
737 unsigned long long stripes
; /* number of old stripes that comprise 'blocks'*/
738 unsigned long long new_size
; /* New size of array in sectors */
741 /* A superswitch provides entry point the a metadata handler.
743 * The superswitch primarily operates on some "metadata" that
744 * is accessed via the 'supertype'.
745 * This metadata has one of three possible sources.
746 * 1/ It is read from a single device. In this case it may not completely
747 * describe the array or arrays as some information might be on other
749 * 2/ It is read from all devices in a container. In this case all
750 * information is present.
751 * 3/ It is created by ->init_super / ->add_to_super. In this case it will
752 * be complete once enough ->add_to_super calls have completed.
754 * When creating an array inside a container, the metadata will be
755 * formed by a combination of 2 and 3. The metadata or the array is read,
756 * then new information is added.
758 * The metadata must sometimes have a concept of a 'current' array
759 * and a 'current' device.
760 * The 'current' array is set by init_super to be the newly created array,
761 * or is set by super_by_fd when it finds it is looking at an array inside
764 * The 'current' device is either the device that the metadata was read from
765 * in case 1, or the last device added by add_to_super in case 3.
766 * Case 2 does not identify a 'current' device.
768 extern struct superswitch
{
770 /* Used to report details of metadata read from a component
771 * device. ->load_super has been called.
773 void (*examine_super
)(struct supertype
*st
, char *homehost
);
774 void (*brief_examine_super
)(struct supertype
*st
, int verbose
);
775 void (*brief_examine_subarrays
)(struct supertype
*st
, int verbose
);
776 void (*export_examine_super
)(struct supertype
*st
);
777 int (*examine_badblocks
)(struct supertype
*st
, int fd
, char *devname
);
778 int (*copy_metadata
)(struct supertype
*st
, int from
, int to
);
780 /* Used to report details of an active array.
781 * ->load_super was possibly given a 'component' string.
783 void (*detail_super
)(struct supertype
*st
, char *homehost
);
784 void (*brief_detail_super
)(struct supertype
*st
);
785 void (*export_detail_super
)(struct supertype
*st
);
787 /* Optional: platform hardware / firmware details */
788 int (*detail_platform
)(int verbose
, int enumerate_only
, char *controller_path
);
789 int (*export_detail_platform
)(int verbose
, char *controller_path
);
792 * to get uuid to storing in bitmap metadata
793 * and 'reshape' backup-data metadata
794 * To see if a device is being re-added to an array it was part of.
796 void (*uuid_from_super
)(struct supertype
*st
, int uuid
[4]);
798 /* Extract generic details from metadata. This could be details about
799 * the container, or about an individual array within the container.
800 * The determination is made either by:
801 * load_super being given a 'component' string.
802 * validate_geometry determining what to create.
803 * The info includes both array information and device information.
804 * The particular device should be:
805 * The last device added by add_to_super
806 * The device the metadata was loaded from by load_super
807 * If 'map' is present, then it is an array raid_disks long
808 * (raid_disk must already be set and correct) and it is filled
809 * with 1 for slots that are thought to be active and 0 for slots which
810 * appear to be failed/missing.
811 * *info is zeroed out before data is added.
813 void (*getinfo_super
)(struct supertype
*st
, struct mdinfo
*info
, char *map
);
814 struct mdinfo
*(*getinfo_super_disks
)(struct supertype
*st
);
815 /* Check if the given metadata is flagged as belonging to "this"
816 * host. 0 for 'no', 1 for 'yes', -1 for "Don't record homehost"
818 int (*match_home
)(struct supertype
*st
, char *homehost
);
820 /* Make one of several generic modifications to metadata
821 * prior to assembly (or other times).
822 * sparc2.2 - first bug in early 0.90 metadata
823 * super-minor - change name of 0.90 metadata
824 * summaries - 'correct' any redundant data
825 * resync - mark array as dirty to trigger a resync.
826 * uuid - set new uuid - only 0.90 or 1.x
827 * name - change the name of the array (where supported)
828 * homehost - change which host this array is tied to.
829 * devicesize - If metadata is at start of device, change recorded
830 * device size to match actual device size
831 * byteorder - swap bytes for 0.90 metadata
833 * force-one - mark that device as uptodate, not old or failed.
834 * force-array - mark array as clean if it would not otherwise
836 * assemble - not sure how this is different from force-one...
837 * linear-grow-new - add a new device to a linear array, but don't
838 * change the size: so superblock still matches
839 * linear-grow-update - now change the size of the array.
840 * writemostly - set the WriteMostly1 bit in the superblock devflags
841 * readwrite - clear the WriteMostly1 bit in the superblock devflags
842 * failfast - set the FailFast1 bit in the superblock
843 * nofailfast - clear the FailFast1 bit
844 * no-bitmap - clear any record that a bitmap is present.
845 * bbl - add a bad-block-log if possible
846 * no-bbl - remove any bad-block-log is it is empty.
847 * force-no-bbl - remove any bad-block-log even if empty.
848 * revert-reshape - If a reshape is in progress, modify metadata so
849 * it will resume going in the opposite direction.
851 int (*update_super
)(struct supertype
*st
, struct mdinfo
*info
,
853 char *devname
, int verbose
,
854 int uuid_set
, char *homehost
);
856 /* Create new metadata for new array as described. This could
857 * be a new container, or an array in a pre-existing container.
858 * Also used to zero metadata prior to writing it to invalidate old
861 int (*init_super
)(struct supertype
*st
, mdu_array_info_t
*info
,
862 unsigned long long size
, char *name
,
863 char *homehost
, int *uuid
,
864 unsigned long long data_offset
);
866 /* update the metadata to include new device, either at create or
867 * when hot-adding a spare.
869 int (*add_to_super
)(struct supertype
*st
, mdu_disk_info_t
*dinfo
,
870 int fd
, char *devname
,
871 unsigned long long data_offset
);
872 /* update the metadata to delete a device,
875 int (*remove_from_super
)(struct supertype
*st
, mdu_disk_info_t
*dinfo
);
877 /* Write metadata to one device when fixing problems or adding
880 int (*store_super
)(struct supertype
*st
, int fd
);
882 /* Write all metadata for this array.
884 int (*write_init_super
)(struct supertype
*st
);
885 /* Check if metadata read from one device is compatible with an array,
886 * used when assembling an array, or pseudo-assembling was with
887 * "--examine --brief"
888 * If "st" has not yet been loaded the superblock from, "tst" is
889 * moved in, otherwise the superblock in 'st' is compared with
892 int (*compare_super
)(struct supertype
*st
, struct supertype
*tst
);
893 /* Load metadata from a single device. If 'devname' is not NULL
894 * print error messages as appropriate */
895 int (*load_super
)(struct supertype
*st
, int fd
, char *devname
);
896 /* 'fd' is a 'container' md array - load array metadata from the
899 int (*load_container
)(struct supertype
*st
, int fd
, char *devname
);
900 /* If 'arg' is a valid name of this metadata type, allocate and
901 * return a 'supertype' for the particular minor version */
902 struct supertype
* (*match_metadata_desc
)(char *arg
);
903 /* If a device has the given size, and the data_offset has been
904 * requested - work out how much space is available for data.
905 * This involves adjusting for reserved space (e.g. bitmaps)
906 * and for any rounding.
907 * 'mdadm' only calls this for existing arrays where a possible
908 * spare is being added. However some super-handlers call it
909 * internally from validate_geometry when creating an array.
911 __u64 (*avail_size
)(struct supertype
*st
, __u64 size
,
912 unsigned long long data_offset
);
913 /* This is similar to 'avail_size' in purpose, but is used for
914 * containers for which there is no 'component size' to compare.
915 * This reports that whole-device size which is a minimum
917 unsigned long long (*min_acceptable_spare_size
)(struct supertype
*st
);
918 /* Find somewhere to put a bitmap - possibly auto-size it - and
919 * update the metadata to record this. The array may be newly
920 * created, in which case data_size may be updated, or it might
921 * already exist. Metadata handler can know if init_super
922 * has been called, but not write_init_super.
926 int (*add_internal_bitmap
)(struct supertype
*st
, int *chunkp
,
927 int delay
, int write_behind
,
928 unsigned long long size
, int may_change
, int major
);
929 /* Seek 'fd' to start of write-intent-bitmap. Must be an
930 * md-native format bitmap
932 int (*locate_bitmap
)(struct supertype
*st
, int fd
, int node_num
);
933 /* if add_internal_bitmap succeeded for existing array, this
936 int (*write_bitmap
)(struct supertype
*st
, int fd
, enum bitmap_update update
);
937 /* Free the superblock and any other allocated data */
938 void (*free_super
)(struct supertype
*st
);
940 /* validate_geometry is called with an st returned by
941 * match_metadata_desc.
942 * It should check that the geometry described is compatible with
943 * the metadata type. It will be called repeatedly as devices
944 * added to validate changing size and new devices. If there are
945 * inter-device dependencies, it should record sufficient details
946 * so these can be validated.
947 * Both 'size' and '*freesize' are in sectors. chunk is KiB.
949 * 1: everything is OK
950 * 0: not OK for some reason - if 'verbose', then error was reported.
951 * -1: st->sb was NULL, 'subdev' is a member of a container of this
952 * type, but array is not acceptable for some reason
953 * message was reported even if verbose is 0.
955 int (*validate_geometry
)(struct supertype
*st
, int level
, int layout
,
957 int *chunk
, unsigned long long size
,
958 unsigned long long data_offset
,
959 char *subdev
, unsigned long long *freesize
,
962 /* Return a linked list of 'mdinfo' structures for all arrays
963 * in the container. For non-containers, it is like
964 * getinfo_super with an allocated mdinfo.*/
965 struct mdinfo
*(*container_content
)(struct supertype
*st
, char *subarray
);
966 /* query the supertype for default geometry */
967 void (*default_geometry
)(struct supertype
*st
, int *level
, int *layout
, int *chunk
); /* optional */
968 /* Permit subarray's to be deleted from inactive containers */
969 int (*kill_subarray
)(struct supertype
*st
); /* optional */
970 /* Permit subarray's to be modified */
971 int (*update_subarray
)(struct supertype
*st
, char *subarray
,
972 char *update
, struct mddev_ident
*ident
); /* optional */
973 /* Check if reshape is supported for this external format.
974 * st is obtained from super_by_fd() where st->subarray[0] is
975 * initialized to indicate if reshape is being performed at the
976 * container or subarray level
978 #define APPLY_METADATA_CHANGES 1
979 #define ROLLBACK_METADATA_CHANGES 0
981 int (*reshape_super
)(struct supertype
*st
,
982 unsigned long long size
, int level
,
983 int layout
, int chunksize
, int raid_disks
,
984 int delta_disks
, char *backup
, char *dev
,
986 int verbose
); /* optional */
987 int (*manage_reshape
)( /* optional */
988 int afd
, struct mdinfo
*sra
, struct reshape
*reshape
,
989 struct supertype
*st
, unsigned long blocks
,
990 int *fds
, unsigned long long *offsets
,
991 int dests
, int *destfd
, unsigned long long *destoffsets
);
994 int (*open_new
)(struct supertype
*c
, struct active_array
*a
,
997 /* Tell the metadata handler the current state of the array.
998 * This covers whether it is known to be consistent (no pending writes)
999 * and how far along a resync is known to have progressed
1000 * (in a->resync_start).
1001 * resync status is really irrelevant if the array is not consistent,
1002 * but some metadata (DDF!) have a place to record the distinction.
1003 * If 'consistent' is '2', then the array can mark it dirty if a
1004 * resync/recovery/whatever is required, or leave it clean if not.
1005 * Return value is 0 dirty (not consistent) and 1 if clean.
1006 * it is only really important if consistent is passed in as '2'.
1008 int (*set_array_state
)(struct active_array
*a
, int consistent
);
1010 /* When the state of a device might have changed, we call set_disk to
1011 * tell the metadata what the current state is.
1012 * Typically this happens on spare->in_sync and (spare|in_sync)->faulty
1014 * set_disk might be called when the state of the particular disk has
1015 * not in fact changed.
1017 void (*set_disk
)(struct active_array
*a
, int n
, int state
);
1018 void (*sync_metadata
)(struct supertype
*st
);
1019 void (*process_update
)(struct supertype
*st
,
1020 struct metadata_update
*update
);
1021 /* Prepare updates allocates extra memory that might be
1022 * needed. If the update cannot be understood, return 0.
1024 int (*prepare_update
)(struct supertype
*st
,
1025 struct metadata_update
*update
);
1027 /* activate_spare will check if the array is degraded and, if it
1028 * is, try to find some spare space in the container.
1029 * On success, it add appropriate updates (For process_update) to
1030 * to the 'updates' list and returns a list of 'mdinfo' identifying
1031 * the device, or devices as there might be multiple missing
1032 * devices and multiple spares available.
1034 struct mdinfo
*(*activate_spare
)(struct active_array
*a
,
1035 struct metadata_update
**updates
);
1037 * Return statically allocated string that represents metadata specific
1038 * controller domain of the disk. The domain is used in disk domain
1039 * matching functions. Disks belong to the same domain if the they have
1040 * the same domain from mdadm.conf and belong the same metadata domain.
1041 * Returning NULL or not providing this handler means that metadata
1042 * does not distinguish the differences between disks that belong to
1043 * different controllers. They are in the domain specified by
1044 * configuration file (mdadm.conf).
1045 * In case when the metadata has the notion of domains based on disk
1046 * it shall return NULL for disks that do not belong to the controller
1047 * the supported domains. Such disks will form another domain and won't
1048 * be mixed with supported ones.
1050 const char *(*get_disk_controller_domain
)(const char *path
);
1052 /* for external backup area */
1053 int (*recover_backup
)(struct supertype
*st
, struct mdinfo
*info
);
1055 /* validate container after assemble */
1056 int (*validate_container
)(struct mdinfo
*info
);
1058 /* records new bad block in metadata */
1059 int (*record_bad_block
)(struct active_array
*a
, int n
,
1060 unsigned long long sector
, int length
);
1062 int swapuuid
; /* true if uuid is bigending rather than hostendian */
1064 const char *name
; /* canonical metadata name */
1067 extern struct superswitch super0
, super1
;
1068 extern struct superswitch super_imsm
, super_ddf
;
1069 extern struct superswitch mbr
, gpt
;
1071 struct metadata_update
{
1074 void *space
; /* allocated space that monitor will use */
1075 void **space_list
; /* list of allocated spaces that monitor can
1076 * use or that it returned.
1078 struct metadata_update
*next
;
1081 /* A supertype holds a particular collection of metadata.
1082 * It identifies the metadata type by the superswitch, and the particular
1083 * sub-version of that metadata type.
1084 * metadata read in or created is stored in 'sb' and 'info'.
1085 * There are also fields used by mdmon to track containers.
1087 * A supertype may refer to:
1088 * Just an array, possibly in a container
1089 * A container, not identifying any particular array
1090 * Info read from just one device, not yet fully describing the array/container.
1093 * A supertype is created by:
1099 struct superswitch
*ss
;
1102 char container_devnm
[32]; /* devnm of container */
1105 void *other
; /* Hack used to convert v0.90 to v1.0 */
1106 unsigned long long devsize
;
1107 unsigned long long data_offset
; /* used by v1.x only */
1108 int ignore_hw_compat
; /* used to inform metadata handlers that it should ignore
1109 HW/firmware related incompatability to load metadata.
1110 Used when examining metadata to display content of disk
1111 when user has no hw/firmare compatible system.
1113 struct metadata_update
*updates
;
1114 struct metadata_update
**update_tail
;
1116 /* extra stuff used by mdmon */
1117 struct active_array
*arrays
;
1118 int sock
; /* listen to external programs */
1119 char devnm
[32]; /* e.g. md0. This appears in metadata_version:
1127 struct mdinfo
*devs
;
1131 extern struct supertype
*super_by_fd(int fd
, char **subarray
);
1132 enum guess_types
{ guess_any
, guess_array
, guess_partitions
};
1133 extern struct supertype
*guess_super_type(int fd
, enum guess_types guess_type
);
1134 static inline struct supertype
*guess_super(int fd
) {
1135 return guess_super_type(fd
, guess_any
);
1137 extern struct supertype
*dup_super(struct supertype
*st
);
1138 extern int get_dev_size(int fd
, char *dname
, unsigned long long *sizep
);
1139 extern int get_dev_sector_size(int fd
, char *dname
, unsigned int *sectsizep
);
1140 extern int must_be_container(int fd
);
1141 extern int dev_size_from_id(dev_t id
, unsigned long long *size
);
1142 void wait_for(char *dev
, int fd
);
1145 * Data structures for policy management.
1146 * Each device can have a policy structure that lists
1147 * various name/value pairs each possibly with a metadata associated.
1148 * The policy list is sorted by name/value/metadata
1151 struct dev_policy
*next
;
1152 char *name
; /* None of these strings are allocated. They are
1153 * all just references to strings which are known
1154 * to exist elsewhere.
1155 * name and metadata can be compared by address equality.
1157 const char *metadata
;
1161 extern char pol_act
[], pol_domain
[], pol_metadata
[], pol_auto
[];
1163 /* iterate over the sublist starting at list, having the same
1164 * 'name' as 'list', and matching the given metadata (Where
1165 * NULL matches anything
1167 #define pol_for_each(item, list, _metadata) \
1169 item && item->name == list->name; \
1170 item = item->next) \
1171 if (!(!_metadata || !item->metadata || _metadata == item->metadata)) \
1175 * policy records read from mdadm are largely just name-value pairs.
1176 * The names are constants, not strdupped
1179 struct pol_rule
*next
;
1180 char *type
; /* rule_policy or rule_part */
1185 char *dups
; /* duplicates of 'value' with a partNN appended */
1189 extern char rule_policy
[], rule_part
[];
1190 extern char rule_path
[], rule_type
[];
1191 extern char type_part
[], type_disk
[];
1193 extern void policyline(char *line
, char *type
);
1194 extern void policy_add(char *type
, ...);
1195 extern void policy_free(void);
1197 extern struct dev_policy
*path_policy(char *path
, char *type
);
1198 extern struct dev_policy
*disk_policy(struct mdinfo
*disk
);
1199 extern struct dev_policy
*devid_policy(int devid
);
1200 extern void dev_policy_free(struct dev_policy
*p
);
1202 //extern void pol_new(struct dev_policy **pol, char *name, char *val, char *metadata);
1203 extern void pol_add(struct dev_policy
**pol
, char *name
, char *val
, char *metadata
);
1204 extern struct dev_policy
*pol_find(struct dev_policy
*pol
, char *name
);
1206 enum policy_action
{
1210 act_spare
, /* This only applies to bare devices */
1211 act_spare_same_slot
, /* this allows non-bare devices,
1212 * but only if recent removal */
1213 act_force_spare
, /* this allow non-bare devices in any case */
1217 extern int policy_action_allows(struct dev_policy
*plist
, const char *metadata
,
1218 enum policy_action want
);
1219 extern int disk_action_allows(struct mdinfo
*disk
, const char *metadata
,
1220 enum policy_action want
);
1223 struct domainlist
*next
;
1227 extern int domain_test(struct domainlist
*dom
, struct dev_policy
*pol
,
1228 const char *metadata
);
1229 extern struct domainlist
*domain_from_array(struct mdinfo
*mdi
,
1230 const char *metadata
);
1231 extern void domainlist_add_dev(struct domainlist
**dom
, int devid
,
1232 const char *metadata
);
1233 extern void domain_free(struct domainlist
*dl
);
1234 extern void domain_merge(struct domainlist
**domp
, struct dev_policy
*pol
,
1235 const char *metadata
);
1236 void domain_add(struct domainlist
**domp
, char *domain
);
1238 extern void policy_save_path(char *id_path
, struct map_ent
*array
);
1239 extern int policy_check_path(struct mdinfo
*disk
, struct map_ent
*array
);
1245 #define HAVE_NFTW we assume
1249 # include <features.h>
1250 # ifndef __UCLIBC_HAS_LFS__
1251 # define lseek64 lseek
1253 # ifndef __UCLIBC_HAS_FTW__
1263 #if defined(__KLIBC__)
1279 extern int add_dev(const char *name
, const struct stat
*stb
, int flag
, struct FTW
*s
);
1281 extern int Manage_ro(char *devname
, int fd
, int readonly
);
1282 extern int Manage_run(char *devname
, int fd
, struct context
*c
);
1283 extern int Manage_stop(char *devname
, int fd
, int quiet
,
1285 extern int Manage_subdevs(char *devname
, int fd
,
1286 struct mddev_dev
*devlist
, int verbose
, int test
,
1287 char *update
, int force
);
1288 extern int autodetect(void);
1289 extern int Grow_Add_device(char *devname
, int fd
, char *newdev
);
1290 extern int Grow_addbitmap(char *devname
, int fd
,
1291 struct context
*c
, struct shape
*s
);
1292 extern int Grow_reshape(char *devname
, int fd
,
1293 struct mddev_dev
*devlist
,
1294 unsigned long long data_offset
,
1295 struct context
*c
, struct shape
*s
);
1296 extern int Grow_restart(struct supertype
*st
, struct mdinfo
*info
,
1297 int *fdlist
, int cnt
, char *backup_file
, int verbose
);
1298 extern int Grow_continue(int mdfd
, struct supertype
*st
,
1299 struct mdinfo
*info
, char *backup_file
,
1300 int forked
, int freeze_reshape
);
1302 extern int restore_backup(struct supertype
*st
,
1303 struct mdinfo
*content
,
1306 char **backup_filep
,
1308 extern int Grow_continue_command(char *devname
, int fd
,
1309 char *backup_file
, int verbose
);
1311 extern int Assemble(struct supertype
*st
, char *mddev
,
1312 struct mddev_ident
*ident
,
1313 struct mddev_dev
*devlist
,
1316 extern int Build(char *mddev
, struct mddev_dev
*devlist
,
1317 struct shape
*s
, struct context
*c
);
1319 extern int Create(struct supertype
*st
, char *mddev
,
1320 char *name
, int *uuid
,
1321 int subdevs
, struct mddev_dev
*devlist
,
1324 unsigned long long data_offset
);
1326 extern int Detail(char *dev
, struct context
*c
);
1327 extern int Detail_Platform(struct superswitch
*ss
, int scan
, int verbose
, int export
, char *controller_path
);
1328 extern int Query(char *dev
);
1329 extern int ExamineBadblocks(char *devname
, int brief
, struct supertype
*forcest
);
1330 extern int Examine(struct mddev_dev
*devlist
, struct context
*c
,
1331 struct supertype
*forcest
);
1332 extern int Monitor(struct mddev_dev
*devlist
,
1333 char *mailaddr
, char *alert_cmd
,
1335 int daemonise
, int oneshot
,
1336 int dosyslog
, char *pidfile
, int increments
,
1339 extern int Kill(char *dev
, struct supertype
*st
, int force
, int verbose
, int noexcl
);
1340 extern int Kill_subarray(char *dev
, char *subarray
, int verbose
);
1341 extern int Update_subarray(char *dev
, char *subarray
, char *update
, struct mddev_ident
*ident
, int quiet
);
1342 extern int Wait(char *dev
);
1343 extern int WaitClean(char *dev
, int sock
, int verbose
);
1344 extern int SetAction(char *dev
, char *action
);
1346 extern int Incremental(struct mddev_dev
*devlist
, struct context
*c
,
1347 struct supertype
*st
);
1348 extern void RebuildMap(void);
1349 extern int IncrementalScan(struct context
*c
, char *devnm
);
1350 extern int IncrementalRemove(char *devname
, char *path
, int verbose
);
1351 extern int CreateBitmap(char *filename
, int force
, char uuid
[16],
1352 unsigned long chunksize
, unsigned long daemon_sleep
,
1353 unsigned long write_behind
,
1354 unsigned long long array_size
,
1356 extern int ExamineBitmap(char *filename
, int brief
, struct supertype
*st
);
1357 extern int Write_rules(char *rule_name
);
1358 extern int bitmap_update_uuid(int fd
, int *uuid
, int swap
);
1360 /* calculate the size of the bitmap given the array size and bitmap chunksize */
1361 static inline unsigned long long
1362 bitmap_bits(unsigned long long array_size
, unsigned long chunksize
)
1364 return (array_size
* 512 + chunksize
- 1) / chunksize
;
1367 extern int Dump_metadata(char *dev
, char *dir
, struct context
*c
,
1368 struct supertype
*st
);
1369 extern int Restore_metadata(char *dev
, char *dir
, struct context
*c
,
1370 struct supertype
*st
, int only
);
1372 extern int md_get_version(int fd
);
1373 extern int get_linux_version(void);
1374 extern int mdadm_version(char *version
);
1375 extern unsigned long long parse_size(char *size
);
1376 extern int parse_uuid(char *str
, int uuid
[4]);
1377 extern int parse_layout_10(char *layout
);
1378 extern int parse_layout_faulty(char *layout
);
1379 extern long parse_num(char *num
);
1380 extern int parse_cluster_confirm_arg(char *inp
, char **devname
, int *slot
);
1381 extern int check_ext2(int fd
, char *name
);
1382 extern int check_reiser(int fd
, char *name
);
1383 extern int check_raid(int fd
, char *name
);
1384 extern int check_partitions(int fd
, char *dname
,
1385 unsigned long long freesize
,
1386 unsigned long long size
);
1388 extern int get_mdp_major(void);
1389 extern int get_maj_min(char *dev
, int *major
, int *minor
);
1390 extern int dev_open(char *dev
, int flags
);
1391 extern int open_dev(char *devnm
);
1392 extern void reopen_mddev(int mdfd
);
1393 extern int open_dev_flags(char *devnm
, int flags
);
1394 extern int open_dev_excl(char *devnm
);
1395 extern int is_standard(char *dev
, int *nump
);
1396 extern int same_dev(char *one
, char *two
);
1397 extern int compare_paths (char* path1
,char* path2
);
1398 extern void enable_fds(int devices
);
1400 extern int parse_auto(char *str
, char *msg
, int config
);
1401 extern struct mddev_ident
*conf_get_ident(char *dev
);
1402 extern struct mddev_dev
*conf_get_devs(void);
1403 extern int conf_test_dev(char *devname
);
1404 extern int conf_test_metadata(const char *version
, struct dev_policy
*pol
, int is_homehost
);
1405 extern struct createinfo
*conf_get_create_info(void);
1406 extern void set_conffile(char *file
);
1407 extern char *conf_get_mailaddr(void);
1408 extern char *conf_get_mailfrom(void);
1409 extern char *conf_get_program(void);
1410 extern char *conf_get_homehost(int *require_homehostp
);
1411 extern char *conf_get_homecluster(void);
1412 extern char *conf_line(FILE *file
);
1413 extern char *conf_word(FILE *file
, int allow_key
);
1414 extern void print_quoted(char *str
);
1415 extern void print_escape(char *str
);
1416 extern int use_udev(void);
1417 extern unsigned long GCD(unsigned long a
, unsigned long b
);
1418 extern int conf_name_is_free(char *name
);
1419 extern int conf_verify_devnames(struct mddev_ident
*array_list
);
1420 extern int devname_matches(char *name
, char *match
);
1421 extern struct mddev_ident
*conf_match(struct supertype
*st
,
1422 struct mdinfo
*info
,
1424 int verbose
, int *rvp
);
1425 extern int experimental(void);
1427 extern void free_line(char *line
);
1428 extern int match_oneof(char *devices
, char *devname
);
1429 extern void uuid_from_super(int uuid
[4], mdp_super_t
*super
);
1430 extern const int uuid_zero
[4];
1431 extern int same_uuid(int a
[4], int b
[4], int swapuuid
);
1432 extern void copy_uuid(void *a
, int b
[4], int swapuuid
);
1433 extern char *__fname_from_uuid(int id
[4], int swap
, char *buf
, char sep
);
1434 extern char *fname_from_uuid(struct supertype
*st
,
1435 struct mdinfo
*info
, char *buf
, char sep
);
1436 extern unsigned long calc_csum(void *super
, int bytes
);
1437 extern int enough(int level
, int raid_disks
, int layout
, int clean
,
1439 extern int enough_fd(int fd
);
1440 extern int ask(char *mesg
);
1441 extern unsigned long long get_component_size(int fd
);
1442 extern void remove_partitions(int fd
);
1443 extern int test_partition(int fd
);
1444 extern int test_partition_from_id(dev_t id
);
1445 extern int get_data_disks(int level
, int layout
, int raid_disks
);
1446 extern unsigned long long calc_array_size(int level
, int raid_disks
, int layout
,
1447 int chunksize
, unsigned long long devsize
);
1448 extern int flush_metadata_updates(struct supertype
*st
);
1449 extern void append_metadata_update(struct supertype
*st
, void *buf
, int len
);
1450 extern int assemble_container_content(struct supertype
*st
, int mdfd
,
1451 struct mdinfo
*content
,
1453 char *chosen_name
, int *result
);
1455 #define INCR_UNSAFE 2
1456 #define INCR_ALREADY 4
1458 extern struct mdinfo
*container_choose_spares(struct supertype
*st
,
1459 unsigned long long min_size
,
1460 struct domainlist
*domlist
,
1462 const char *metadata
, int get_one
);
1463 extern int move_spare(char *from_devname
, char *to_devname
, dev_t devid
);
1464 extern int add_disk(int mdfd
, struct supertype
*st
,
1465 struct mdinfo
*sra
, struct mdinfo
*info
);
1466 extern int remove_disk(int mdfd
, struct supertype
*st
,
1467 struct mdinfo
*sra
, struct mdinfo
*info
);
1468 extern int set_array_info(int mdfd
, struct supertype
*st
, struct mdinfo
*info
);
1469 unsigned long long min_recovery_start(struct mdinfo
*array
);
1471 extern char *human_size(long long bytes
);
1472 extern char *human_size_brief(long long bytes
, int prefix
);
1473 extern void print_r10_layout(int layout
);
1475 extern char *find_free_devnm(int use_partitions
);
1477 extern void put_md_name(char *name
);
1478 extern char *devid2kname(int devid
);
1479 extern char *devid2devnm(dev_t devid
);
1480 extern dev_t
devnm2devid(char *devnm
);
1481 extern char *get_md_name(char *devnm
);
1483 extern char DefaultConfFile
[];
1485 extern int create_mddev(char *dev
, char *name
, int autof
, int trustworthy
,
1487 /* values for 'trustworthy' */
1489 #define LOCAL_ANY 10
1492 extern int open_mddev(char *dev
, int report_errors
);
1493 extern int open_container(int fd
);
1494 extern int metadata_container_matches(char *metadata
, char *devnm
);
1495 extern int metadata_subdev_matches(char *metadata
, char *devnm
);
1496 extern int is_container_member(struct mdstat_ent
*ent
, char *devname
);
1497 extern int is_subarray_active(char *subarray
, char *devname
);
1498 extern int open_subarray(char *dev
, char *subarray
, struct supertype
*st
, int quiet
);
1499 extern struct superswitch
*version_to_superswitch(char *vers
);
1501 extern int mdmon_running(char *devnm
);
1502 extern int mdmon_pid(char *devnm
);
1503 extern int check_env(char *name
);
1504 extern __u32
random32(void);
1505 extern void random_uuid(__u8
*buf
);
1506 extern int start_mdmon(char *devnm
);
1508 extern int child_monitor(int afd
, struct mdinfo
*sra
, struct reshape
*reshape
,
1509 struct supertype
*st
, unsigned long stripes
,
1510 int *fds
, unsigned long long *offsets
,
1511 int dests
, int *destfd
, unsigned long long *destoffsets
);
1512 void abort_reshape(struct mdinfo
*sra
);
1514 void *super1_make_v0(struct supertype
*st
, struct mdinfo
*info
, mdp_super_t
*sb0
);
1516 extern char *stat2kname(struct stat
*st
);
1517 extern char *fd2kname(int fd
);
1518 extern char *stat2devnm(struct stat
*st
);
1519 extern char *fd2devnm(int fd
);
1521 extern int in_initrd(void);
1524 void *cmap_handle
; /* corosync lib related */
1526 int (*initialize
)(cmap_handle_t
*handle
);
1527 int (*get_string
)(cmap_handle_t handle
,
1530 int (*finalize
)(cmap_handle_t handle
);
1533 extern void set_cmap_hooks(void);
1534 extern void set_hooks(void);
1537 void *dlm_handle
; /* dlm lib related */
1539 dlm_lshandle_t (*create_lockspace
)(const char *name
,
1541 int (*release_lockspace
)(const char *name
, dlm_lshandle_t ls
,
1543 int (*ls_lock
)(dlm_lshandle_t lockspace
, uint32_t mode
,
1544 struct dlm_lksb
*lksb
, uint32_t flags
,
1545 const void *name
, unsigned int namelen
,
1546 uint32_t parent
, void (*astaddr
) (void *astarg
),
1547 void *astarg
, void (*bastaddr
) (void *astarg
),
1549 int (*ls_unlock
)(dlm_lshandle_t lockspace
, uint32_t lkid
,
1550 uint32_t flags
, struct dlm_lksb
*lksb
,
1552 int (*ls_get_fd
)(dlm_lshandle_t ls
);
1553 int (*dispatch
)(int fd
);
1556 extern int get_cluster_name(char **name
);
1557 extern int dlm_funs_ready(void);
1558 extern int cluster_get_dlmlock(int *lockid
);
1559 extern int cluster_release_dlmlock(int lockid
);
1560 extern void set_dlm_hooks(void);
1562 #define _ROUND_UP(val, base) (((val) + (base) - 1) & ~(base - 1))
1563 #define ROUND_UP(val, base) _ROUND_UP(val, (typeof(val))(base))
1564 #define ROUND_UP_PTR(ptr, base) ((typeof(ptr)) \
1565 (ROUND_UP((unsigned long)(ptr), base)))
1567 static inline int is_subarray(char *vers
)
1569 /* The version string for a 'subarray' (an array in a container)
1571 * /containername/componentname for normal read-write arrays
1572 * -containername/componentname for arrays which mdmon must not
1573 * reconfigure. They might be read-only
1574 * or might be undergoing reshape etc.
1575 * containername is e.g. md0, md_d1
1576 * componentname is dependant on the metadata. e.g. '1' 'S1' ...
1578 return (*vers
== '/' || *vers
== '-');
1581 static inline char *to_subarray(struct mdstat_ent
*ent
, char *container
)
1583 return &ent
->metadata_version
[10+strlen(container
)+1];
1587 #define dprintf(fmt, arg...) \
1588 fprintf(stderr, "%s: %s: "fmt, Name, __func__, ##arg)
1589 #define dprintf_cont(fmt, arg...) \
1590 fprintf(stderr, fmt, ##arg)
1592 #define dprintf(fmt, arg...) \
1593 ({ if (0) fprintf(stderr, "%s: %s: " fmt, Name, __func__, ##arg); 0; })
1594 #define dprintf_cont(fmt, arg...) \
1595 ({ if (0) fprintf(stderr, fmt, ##arg); 0; })
1599 static inline int xasprintf(char **strp
, const char *fmt
, ...) {
1603 ret
= vasprintf(strp
, fmt
, ap
);
1610 #define pr_err(fmt, args...) fprintf(stderr, "%s: %s: "fmt, Name, __func__, ##args)
1612 #define pr_err(fmt, args...) fprintf(stderr, "%s: "fmt, Name, ##args)
1614 #define cont_err(fmt ...) fprintf(stderr, " " fmt)
1616 void *xmalloc(size_t len
);
1617 void *xrealloc(void *ptr
, size_t len
);
1618 void *xcalloc(size_t num
, size_t size
);
1619 char *xstrdup(const char *str
);
1621 #define LEVEL_MULTIPATH (-4)
1622 #define LEVEL_LINEAR (-1)
1623 #define LEVEL_FAULTY (-5)
1625 /* kernel module doesn't know about these */
1626 #define LEVEL_CONTAINER (-100)
1627 #define LEVEL_UNSUPPORTED (-200)
1629 /* the kernel does know about this one ... */
1630 #define LEVEL_NONE (-1000000)
1634 #define WriteTransient 0
1635 #define ReadTransient 1
1636 #define WritePersistent 2
1637 #define ReadPersistent 3
1638 #define WriteAll 4 /* doesn't go to device */
1639 #define ReadFixable 5
1642 #define ClearErrors 31
1643 #define ClearFaults 30
1645 #define AllPersist 100 /* internal use only */
1646 #define NoPersist 101
1648 #define ModeMask 0x1f
1655 #define minor(x) ((x)&0xff)
1656 #define major(x) (((x)>>8)&0xff)
1657 #define makedev(M,m) (((M)<<8) | (m))
1661 #define ALGORITHM_LEFT_ASYMMETRIC 0
1662 #define ALGORITHM_RIGHT_ASYMMETRIC 1
1663 #define ALGORITHM_LEFT_SYMMETRIC 2
1664 #define ALGORITHM_RIGHT_SYMMETRIC 3
1666 /* Define non-rotating (raid4) algorithms. These allow
1667 * conversion of raid4 to raid5.
1669 #define ALGORITHM_PARITY_0 4 /* P or P,Q are initial devices */
1670 #define ALGORITHM_PARITY_N 5 /* P or P,Q are final devices. */
1672 /* DDF RAID6 layouts differ from md/raid6 layouts in two ways.
1673 * Firstly, the exact positioning of the parity block is slightly
1674 * different between the 'LEFT_*' modes of md and the "_N_*" modes
1676 * Secondly, or order of datablocks over which the Q syndrome is computed
1678 * Consequently we have different layouts for DDF/raid6 than md/raid6.
1679 * These layouts are from the DDFv1.2 spec.
1680 * Interestingly DDFv1.2-Errata-A does not specify N_CONTINUE but
1681 * leaves RLQ=3 as 'Vendor Specific'
1684 #define ALGORITHM_ROTATING_ZERO_RESTART 8 /* DDF PRL=6 RLQ=1 */
1685 #define ALGORITHM_ROTATING_N_RESTART 9 /* DDF PRL=6 RLQ=2 */
1686 #define ALGORITHM_ROTATING_N_CONTINUE 10 /*DDF PRL=6 RLQ=3 */
1688 /* For every RAID5 algorithm we define a RAID6 algorithm
1689 * with exactly the same layout for data and parity, and
1690 * with the Q block always on the last device (N-1).
1691 * This allows trivial conversion from RAID5 to RAID6
1693 #define ALGORITHM_LEFT_ASYMMETRIC_6 16
1694 #define ALGORITHM_RIGHT_ASYMMETRIC_6 17
1695 #define ALGORITHM_LEFT_SYMMETRIC_6 18
1696 #define ALGORITHM_RIGHT_SYMMETRIC_6 19
1697 #define ALGORITHM_PARITY_0_6 20
1698 #define ALGORITHM_PARITY_N_6 ALGORITHM_PARITY_N
1700 /* Define PATH_MAX in case we don't use glibc or standard library does
1701 * not have PATH_MAX defined. Assume max path length is 4K characters.
1704 #define PATH_MAX 4096
1707 #define RESYNC_NONE -1
1708 #define RESYNC_DELAYED -2
1709 #define RESYNC_PENDING -3
1710 #define RESYNC_UNKNOWN -4
1712 /* When using "GET_DISK_INFO" it isn't certain how high
1713 * we need to check. So we impose an absolute limit of
1714 * MAX_DISKS. This needs to be much more than the largest
1715 * number of devices any metadata can support. Currently
1716 * v1.x can support 1920
1718 #define MAX_DISKS 4096
1720 /* Sometimes the 'size' value passed needs to mean "Maximum".
1721 * In those cases with use MAX_SIZE
1725 /* We want to use unsigned numbers for sector counts, but need
1726 * a value for 'invalid'. Use '1'.
1728 #define INVALID_SECTORS 1
1729 /* And another special number needed for --data_offset=variable */
1730 #define VARIABLE_OFFSET 3