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>
28 #if ! defined(__BIG_ENDIAN) && ! defined(__LITTLE_ENDIAN)
29 #error no endian defined
35 #define offsetof(t,f) ((size_t)&(((t*)0)->f))
38 int restore_backup(struct supertype
*st
,
39 struct mdinfo
*content
,
49 int disk_count
= next_spare
+ working_disks
;
51 dprintf("Called restore_backup()\n");
52 fdlist
= malloc(sizeof(int) * disk_count
);
55 Name
": cannot allocate memory for disk list\n");
58 for (i
= 0; i
< next_spare
; i
++)
60 for (dev
= content
->devs
; dev
; dev
= dev
->next
) {
66 fd
= dev_open(buf
, O_RDWR
);
68 if (dev
->disk
.raid_disk
>= 0)
69 fdlist
[dev
->disk
.raid_disk
] = fd
;
71 fdlist
[next_spare
++] = fd
;
74 if (st
->ss
->external
&& st
->ss
->recover_backup
)
75 err
= st
->ss
->recover_backup(st
, content
);
77 err
= Grow_restart(st
, content
, fdlist
, next_spare
,
78 backup_file
, verbose
> 0);
80 while (next_spare
> 0) {
82 if (fdlist
[next_spare
] >= 0)
83 close(fdlist
[next_spare
]);
87 fprintf(stderr
, Name
": Failed to restore critical"
88 " section for reshape - sorry.\n");
90 fprintf(stderr
, Name
": Possibly you need"
91 " to specify a --backup-file\n");
95 dprintf("restore_backup() returns status OK.\n");
99 int Grow_Add_device(char *devname
, int fd
, char *newdev
)
101 /* Add a device to an active array.
102 * Currently, just extend a linear array.
103 * This requires writing a new superblock on the
104 * new device, calling the kernel to add the device,
105 * and if that succeeds, update the superblock on
107 * This means that we need to *find* all other devices.
114 struct supertype
*st
= NULL
;
115 char *subarray
= NULL
;
117 if (ioctl(fd
, GET_ARRAY_INFO
, &info
.array
) < 0) {
118 fprintf(stderr
, Name
": cannot get array info for %s\n", devname
);
122 if (info
.array
.level
!= -1) {
123 fprintf(stderr
, Name
": can only add devices to linear arrays\n");
127 st
= super_by_fd(fd
, &subarray
);
129 fprintf(stderr
, Name
": cannot handle arrays with superblock version %d\n", info
.array
.major_version
);
134 fprintf(stderr
, Name
": Cannot grow linear sub-arrays yet\n");
140 nfd
= open(newdev
, O_RDWR
|O_EXCL
|O_DIRECT
);
142 fprintf(stderr
, Name
": cannot open %s\n", newdev
);
147 if ((stb
.st_mode
& S_IFMT
) != S_IFBLK
) {
148 fprintf(stderr
, Name
": %s is not a block device!\n", newdev
);
153 /* now check out all the devices and make sure we can read the superblock */
154 for (d
=0 ; d
< info
.array
.raid_disks
; d
++) {
155 mdu_disk_info_t disk
;
158 st
->ss
->free_super(st
);
161 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0) {
162 fprintf(stderr
, Name
": cannot get device detail for device %d\n",
168 dv
= map_dev(disk
.major
, disk
.minor
, 1);
170 fprintf(stderr
, Name
": cannot find device file for device %d\n",
176 fd2
= dev_open(dv
, O_RDWR
);
178 fprintf(stderr
, Name
": cannot open device file %s\n", dv
);
184 if (st
->ss
->load_super(st
, fd2
, NULL
)) {
185 fprintf(stderr
, Name
": cannot find super block on %s\n", dv
);
193 /* Ok, looks good. Lets update the superblock and write it out to
197 info
.disk
.number
= d
;
198 info
.disk
.major
= major(stb
.st_rdev
);
199 info
.disk
.minor
= minor(stb
.st_rdev
);
200 info
.disk
.raid_disk
= d
;
201 info
.disk
.state
= (1 << MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
);
202 st
->ss
->update_super(st
, &info
, "linear-grow-new", newdev
,
205 if (st
->ss
->store_super(st
, nfd
)) {
206 fprintf(stderr
, Name
": Cannot store new superblock on %s\n",
213 if (ioctl(fd
, ADD_NEW_DISK
, &info
.disk
) != 0) {
214 fprintf(stderr
, Name
": Cannot add new disk to this array\n");
217 /* Well, that seems to have worked.
218 * Now go through and update all superblocks
221 if (ioctl(fd
, GET_ARRAY_INFO
, &info
.array
) < 0) {
222 fprintf(stderr
, Name
": cannot get array info for %s\n", devname
);
227 for (d
=0 ; d
< info
.array
.raid_disks
; d
++) {
228 mdu_disk_info_t disk
;
232 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0) {
233 fprintf(stderr
, Name
": cannot get device detail for device %d\n",
237 dv
= map_dev(disk
.major
, disk
.minor
, 1);
239 fprintf(stderr
, Name
": cannot find device file for device %d\n",
243 fd2
= dev_open(dv
, O_RDWR
);
245 fprintf(stderr
, Name
": cannot open device file %s\n", dv
);
248 if (st
->ss
->load_super(st
, fd2
, NULL
)) {
249 fprintf(stderr
, Name
": cannot find super block on %s\n", dv
);
253 info
.array
.raid_disks
= nd
+1;
254 info
.array
.nr_disks
= nd
+1;
255 info
.array
.active_disks
= nd
+1;
256 info
.array
.working_disks
= nd
+1;
258 st
->ss
->update_super(st
, &info
, "linear-grow-update", dv
,
261 if (st
->ss
->store_super(st
, fd2
)) {
262 fprintf(stderr
, Name
": Cannot store new superblock on %s\n", dv
);
272 int Grow_addbitmap(char *devname
, int fd
, char *file
, int chunk
, int delay
, int write_behind
, int force
)
275 * First check that array doesn't have a bitmap
276 * Then create the bitmap
279 * For internal bitmaps, we need to check the version,
280 * find all the active devices, and write the bitmap block
283 mdu_bitmap_file_t bmf
;
284 mdu_array_info_t array
;
285 struct supertype
*st
;
286 char *subarray
= NULL
;
287 int major
= BITMAP_MAJOR_HI
;
288 int vers
= md_get_version(fd
);
289 unsigned long long bitmapsize
, array_size
;
292 major
= BITMAP_MAJOR_HOSTENDIAN
;
293 fprintf(stderr
, Name
": Warning - bitmaps created on this kernel"
294 " are not portable\n"
295 " between different architectures. Consider upgrading"
296 " the Linux kernel.\n");
299 if (ioctl(fd
, GET_BITMAP_FILE
, &bmf
) != 0) {
301 fprintf(stderr
, Name
": Memory allocation failure.\n");
303 fprintf(stderr
, Name
": bitmaps not supported by this kernel.\n");
306 if (bmf
.pathname
[0]) {
307 if (strcmp(file
,"none")==0) {
308 if (ioctl(fd
, SET_BITMAP_FILE
, -1)!= 0) {
309 fprintf(stderr
, Name
": failed to remove bitmap %s\n",
315 fprintf(stderr
, Name
": %s already has a bitmap (%s)\n",
316 devname
, bmf
.pathname
);
319 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) != 0) {
320 fprintf(stderr
, Name
": cannot get array status for %s\n", devname
);
323 if (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)) {
324 if (strcmp(file
, "none")==0) {
325 array
.state
&= ~(1<<MD_SB_BITMAP_PRESENT
);
326 if (ioctl(fd
, SET_ARRAY_INFO
, &array
)!= 0) {
327 fprintf(stderr
, Name
": failed to remove internal bitmap.\n");
332 fprintf(stderr
, Name
": Internal bitmap already present on %s\n",
337 if (strcmp(file
, "none") == 0) {
338 fprintf(stderr
, Name
": no bitmap found on %s\n", devname
);
341 if (array
.level
<= 0) {
342 fprintf(stderr
, Name
": Bitmaps not meaningful with level %s\n",
343 map_num(pers
, array
.level
)?:"of this array");
346 bitmapsize
= array
.size
;
348 if (get_dev_size(fd
, NULL
, &array_size
) &&
349 array_size
> (0x7fffffffULL
<<9)) {
350 /* Array is big enough that we cannot trust array.size
351 * try other approaches
353 bitmapsize
= get_component_size(fd
);
355 if (bitmapsize
== 0) {
356 fprintf(stderr
, Name
": Cannot reliably determine size of array to create bitmap - sorry.\n");
360 if (array
.level
== 10) {
361 int ncopies
= (array
.layout
&255)*((array
.layout
>>8)&255);
362 bitmapsize
= bitmapsize
* array
.raid_disks
/ ncopies
;
365 st
= super_by_fd(fd
, &subarray
);
367 fprintf(stderr
, Name
": Cannot understand version %d.%d\n",
368 array
.major_version
, array
.minor_version
);
372 fprintf(stderr
, Name
": Cannot add bitmaps to sub-arrays yet\n");
377 if (strcmp(file
, "internal") == 0) {
379 if (st
->ss
->add_internal_bitmap
== NULL
) {
380 fprintf(stderr
, Name
": Internal bitmaps not supported "
381 "with %s metadata\n", st
->ss
->name
);
384 for (d
=0; d
< st
->max_devs
; d
++) {
385 mdu_disk_info_t disk
;
388 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
390 if (disk
.major
== 0 &&
393 if ((disk
.state
& (1<<MD_DISK_SYNC
))==0)
395 dv
= map_dev(disk
.major
, disk
.minor
, 1);
397 int fd2
= dev_open(dv
, O_RDWR
);
400 if (st
->ss
->load_super(st
, fd2
, NULL
)==0) {
401 if (st
->ss
->add_internal_bitmap(
403 &chunk
, delay
, write_behind
,
404 bitmapsize
, 0, major
)
406 st
->ss
->write_bitmap(st
, fd2
);
408 fprintf(stderr
, Name
": failed to create internal bitmap - chunksize problem.\n");
416 array
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
417 if (ioctl(fd
, SET_ARRAY_INFO
, &array
)!= 0) {
420 ": Cannot add bitmap while array is"
421 " resyncing or reshaping etc.\n");
422 fprintf(stderr
, Name
": failed to set internal bitmap.\n");
429 int max_devs
= st
->max_devs
;
431 /* try to load a superblock */
432 for (d
=0; d
<max_devs
; d
++) {
433 mdu_disk_info_t disk
;
437 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
439 if ((disk
.major
==0 && disk
.minor
==0) ||
440 (disk
.state
& (1<<MD_DISK_REMOVED
)))
442 dv
= map_dev(disk
.major
, disk
.minor
, 1);
444 fd2
= dev_open(dv
, O_RDONLY
);
446 if (st
->ss
->load_super(st
, fd2
, NULL
) == 0) {
448 st
->ss
->uuid_from_super(st
, uuid
);
455 fprintf(stderr
, Name
": cannot find UUID for array!\n");
458 if (CreateBitmap(file
, force
, (char*)uuid
, chunk
,
459 delay
, write_behind
, bitmapsize
, major
)) {
462 bitmap_fd
= open(file
, O_RDWR
);
464 fprintf(stderr
, Name
": weird: %s cannot be opened\n",
468 if (ioctl(fd
, SET_BITMAP_FILE
, bitmap_fd
) < 0) {
472 ": Cannot add bitmap while array is"
473 " resyncing or reshaping etc.\n");
474 fprintf(stderr
, Name
": Cannot set bitmap file for %s: %s\n",
475 devname
, strerror(err
));
485 * When reshaping an array we might need to backup some data.
486 * This is written to all spares with a 'super_block' describing it.
487 * The superblock goes 4K from the end of the used space on the
489 * It if written after the backup is complete.
490 * It has the following structure.
493 static struct mdp_backup_super
{
494 char magic
[16]; /* md_backup_data-1 or -2 */
497 /* start/sizes in 512byte sectors */
498 __u64 devstart
; /* address on backup device/file of data */
501 __u32 sb_csum
; /* csum of preceeding bytes. */
503 __u64 devstart2
; /* offset in to data of second section */
506 __u32 sb_csum2
; /* csum of preceeding bytes. */
508 } __attribute__((aligned(512))) bsb
, bsb2
;
510 static __u32
bsb_csum(char *buf
, int len
)
514 for (i
=0; i
<len
; i
++)
515 csum
= (csum
<<3) + buf
[0];
516 return __cpu_to_le32(csum
);
519 static int check_idle(struct supertype
*st
)
521 /* Check that all member arrays for this container, or the
522 * container of this array, are idle
524 int container_dev
= (st
->container_dev
!= NoMdDev
525 ? st
->container_dev
: st
->devnum
);
527 struct mdstat_ent
*ent
, *e
;
530 fmt_devname(container
, container_dev
);
531 ent
= mdstat_read(0, 0);
532 for (e
= ent
; e
; e
= e
->next
) {
533 if (!is_container_member(e
, container
))
535 if (e
->percent
>= 0) {
544 static int freeze_container(struct supertype
*st
)
546 int container_dev
= (st
->container_dev
!= NoMdDev
547 ? st
->container_dev
: st
->devnum
);
553 fmt_devname(container
, container_dev
);
555 if (block_monitor(container
, 1)) {
556 fprintf(stderr
, Name
": failed to freeze container\n");
563 static void unfreeze_container(struct supertype
*st
)
565 int container_dev
= (st
->container_dev
!= NoMdDev
566 ? st
->container_dev
: st
->devnum
);
569 fmt_devname(container
, container_dev
);
571 unblock_monitor(container
, 1);
574 static int freeze(struct supertype
*st
)
576 /* Try to freeze resync/rebuild on this array/container.
577 * Return -1 if the array is busy,
578 * return -2 container cannot be frozen,
579 * return 0 if this kernel doesn't support 'frozen'
580 * return 1 if it worked.
582 if (st
->ss
->external
)
583 return freeze_container(st
);
585 struct mdinfo
*sra
= sysfs_read(-1, st
->devnum
, GET_VERSION
);
591 /* Need to clear any 'read-auto' status */
592 if (sysfs_get_str(sra
, NULL
, "array_state", buf
, 20) > 0 &&
593 strncmp(buf
, "read-auto", 9) == 0)
594 sysfs_set_str(sra
, NULL
, "array_state", "clean");
596 err
= sysfs_freeze_array(sra
);
602 static void unfreeze(struct supertype
*st
)
604 if (st
->ss
->external
)
605 return unfreeze_container(st
);
607 struct mdinfo
*sra
= sysfs_read(-1, st
->devnum
, GET_VERSION
);
610 sysfs_set_str(sra
, NULL
, "sync_action", "idle");
612 fprintf(stderr
, Name
": failed to unfreeze array\n");
617 static void wait_reshape(struct mdinfo
*sra
)
619 int fd
= sysfs_get_fd(sra
, NULL
, "sync_action");
625 while (sysfs_fd_get_str(fd
, action
, 20) > 0 &&
626 strncmp(action
, "reshape", 7) == 0) {
630 select(fd
+1, NULL
, NULL
, &rfds
, NULL
);
635 static int reshape_super(struct supertype
*st
, long long size
, int level
,
636 int layout
, int chunksize
, int raid_disks
,
637 int delta_disks
, char *backup_file
, char *dev
,
640 /* nothing extra to check in the native case */
641 if (!st
->ss
->external
)
643 if (!st
->ss
->reshape_super
||
644 !st
->ss
->manage_reshape
) {
645 fprintf(stderr
, Name
": %s metadata does not support reshape\n",
650 return st
->ss
->reshape_super(st
, size
, level
, layout
, chunksize
,
651 raid_disks
, delta_disks
, backup_file
, dev
,
655 static void sync_metadata(struct supertype
*st
)
657 if (st
->ss
->external
) {
658 if (st
->update_tail
) {
659 flush_metadata_updates(st
);
660 st
->update_tail
= &st
->updates
;
662 st
->ss
->sync_metadata(st
);
666 static int subarray_set_num(char *container
, struct mdinfo
*sra
, char *name
, int n
)
668 /* when dealing with external metadata subarrays we need to be
669 * prepared to handle EAGAIN. The kernel may need to wait for
670 * mdmon to mark the array active so the kernel can handle
671 * allocations/writeback when preparing the reshape action
672 * (md_allow_write()). We temporarily disable safe_mode_delay
673 * to close a race with the array_state going clean before the
674 * next write to raid_disks / stripe_cache_size
679 /* only 'raid_disks' and 'stripe_cache_size' trigger md_allow_write */
681 (strcmp(name
, "raid_disks") != 0 &&
682 strcmp(name
, "stripe_cache_size") != 0))
683 return sysfs_set_num(sra
, NULL
, name
, n
);
685 rc
= sysfs_get_str(sra
, NULL
, "safe_mode_delay", safe
, sizeof(safe
));
688 sysfs_set_num(sra
, NULL
, "safe_mode_delay", 0);
689 rc
= sysfs_set_num(sra
, NULL
, name
, n
);
690 if (rc
< 0 && errno
== EAGAIN
) {
691 ping_monitor(container
);
692 /* if we get EAGAIN here then the monitor is not active
695 rc
= sysfs_set_num(sra
, NULL
, name
, n
);
697 sysfs_set_str(sra
, NULL
, "safe_mode_delay", safe
);
701 int start_reshape(struct mdinfo
*sra
, int already_running
, int data_disks
)
704 unsigned long long sync_max_to_set
;
706 sysfs_set_num(sra
, NULL
, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL
);
707 err
= sysfs_set_num(sra
, NULL
, "suspend_hi", sra
->reshape_progress
);
708 err
= err
?: sysfs_set_num(sra
, NULL
, "suspend_lo",
709 sra
->reshape_progress
);
710 sync_max_to_set
= sra
->reshape_progress
/ data_disks
;
711 if (!already_running
)
712 sysfs_set_num(sra
, NULL
, "sync_min", sync_max_to_set
);
713 err
= err
?: sysfs_set_num(sra
, NULL
, "sync_max", sync_max_to_set
);
714 if (!already_running
)
715 err
= err
?: sysfs_set_str(sra
, NULL
, "sync_action", "reshape");
720 void abort_reshape(struct mdinfo
*sra
)
722 sysfs_set_str(sra
, NULL
, "sync_action", "idle");
723 sysfs_set_num(sra
, NULL
, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL
);
724 sysfs_set_num(sra
, NULL
, "suspend_hi", 0);
725 sysfs_set_num(sra
, NULL
, "suspend_lo", 0);
726 sysfs_set_num(sra
, NULL
, "sync_min", 0);
727 sysfs_set_str(sra
, NULL
, "sync_max", "max");
730 int remove_disks_for_takeover(struct supertype
*st
,
735 struct mdinfo
*remaining
;
738 if (sra
->array
.level
== 10)
739 nr_of_copies
= layout
& 0xff;
740 else if (sra
->array
.level
== 1)
741 nr_of_copies
= sra
->array
.raid_disks
;
745 remaining
= sra
->devs
;
747 /* for each 'copy', select one device and remove from the list. */
748 for (slot
= 0; slot
< sra
->array
.raid_disks
; slot
+= nr_of_copies
) {
749 struct mdinfo
**diskp
;
752 /* Find a working device to keep */
753 for (diskp
= &remaining
; *diskp
; diskp
= &(*diskp
)->next
) {
754 struct mdinfo
*disk
= *diskp
;
756 if (disk
->disk
.raid_disk
< slot
)
758 if (disk
->disk
.raid_disk
>= slot
+ nr_of_copies
)
760 if (disk
->disk
.state
& (1<<MD_DISK_REMOVED
))
762 if (disk
->disk
.state
& (1<<MD_DISK_FAULTY
))
764 if (!(disk
->disk
.state
& (1<<MD_DISK_SYNC
)))
767 /* We have found a good disk to use! */
769 disk
->next
= sra
->devs
;
778 if (slot
< sra
->array
.raid_disks
) {
779 /* didn't find all slots */
785 sra
->devs
= remaining
;
789 /* Remove all 'remaining' devices from the array */
791 struct mdinfo
*sd
= remaining
;
792 remaining
= sd
->next
;
794 sysfs_set_str(sra
, sd
, "state", "faulty");
795 sysfs_set_str(sra
, sd
, "slot", "none");
796 /* for external metadata disks should be removed in mdmon */
797 if (!st
->ss
->external
)
798 sysfs_set_str(sra
, sd
, "state", "remove");
799 sd
->disk
.state
|= (1<<MD_DISK_REMOVED
);
800 sd
->disk
.state
&= ~(1<<MD_DISK_SYNC
);
801 sd
->next
= sra
->devs
;
807 void reshape_free_fdlist(int *fdlist
,
808 unsigned long long *offsets
,
813 for (i
= 0; i
< size
; i
++)
821 int reshape_prepare_fdlist(char *devname
,
825 unsigned long blocks
,
828 unsigned long long *offsets
)
833 for (d
= 0; d
<= nrdisks
; d
++)
836 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
837 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
839 if (sd
->disk
.state
& (1<<MD_DISK_SYNC
)) {
840 char *dn
= map_dev(sd
->disk
.major
,
842 fdlist
[sd
->disk
.raid_disk
]
843 = dev_open(dn
, O_RDONLY
);
844 offsets
[sd
->disk
.raid_disk
] = sd
->data_offset
*512;
845 if (fdlist
[sd
->disk
.raid_disk
] < 0) {
847 Name
": %s: cannot open component %s\n",
848 devname
, dn
? dn
: "-unknown-");
852 } else if (backup_file
== NULL
) {
854 char *dn
= map_dev(sd
->disk
.major
,
856 fdlist
[d
] = dev_open(dn
, O_RDWR
);
857 offsets
[d
] = (sd
->data_offset
+ sra
->component_size
- blocks
- 8)*512;
859 fprintf(stderr
, Name
": %s: cannot open component %s\n",
860 devname
, dn
? dn
: "-unknown-");
871 int reshape_open_backup_file(char *backup_file
,
876 unsigned long long *offsets
,
879 /* Return 1 on success, 0 on any form of failure */
880 /* need to check backup file is large enough */
886 *fdlist
= open(backup_file
, O_RDWR
|O_CREAT
|(restart
? O_TRUNC
: O_EXCL
),
890 fprintf(stderr
, Name
": %s: cannot create backup file %s: %s\n",
891 devname
, backup_file
, strerror(errno
));
894 /* Guard against backup file being on array device.
895 * If array is partitioned or if LVM etc is in the
896 * way this will not notice, but it is better than
899 fstat(*fdlist
, &stb
);
902 if (stb
.st_rdev
== dev
) {
903 fprintf(stderr
, Name
": backup file must NOT be"
904 " on the array being reshaped.\n");
910 for (i
=0; i
< blocks
+ 8 ; i
++) {
911 if (write(*fdlist
, buf
, 512) != 512) {
912 fprintf(stderr
, Name
": %s: cannot create"
913 " backup file %s: %s\n",
914 devname
, backup_file
, strerror(errno
));
918 if (fsync(*fdlist
) != 0) {
919 fprintf(stderr
, Name
": %s: cannot create backup file %s: %s\n",
920 devname
, backup_file
, strerror(errno
));
927 unsigned long compute_backup_blocks(int nchunk
, int ochunk
,
928 unsigned int ndata
, unsigned int odata
)
930 unsigned long a
, b
, blocks
;
931 /* So how much do we need to backup.
932 * We need an amount of data which is both a whole number of
933 * old stripes and a whole number of new stripes.
934 * So LCM for (chunksize*datadisks).
936 a
= (ochunk
/512) * odata
;
937 b
= (nchunk
/512) * ndata
;
945 /* LCM == product / GCD */
946 blocks
= (ochunk
/512) * (nchunk
/512) * odata
* ndata
/ a
;
951 char *analyse_change(struct mdinfo
*info
, struct reshape
*re
)
953 /* Based on the current array state in info->array and
954 * the changes in info->new_* etc, determine:
955 * - whether the change is possible
956 * - Intermediate level/raid_disks/layout
957 * - whether a restriping reshape is needed
958 * - number of sectors in minimum change unit. This
959 * will cover a whole number of stripes in 'before' and
962 * Return message if the change should be rejected
963 * NULL if the change can be achieved
965 * This can be called as part of starting a reshape, or
966 * when assembling an array that is undergoing reshape.
969 /* delta_parity records change in number of devices
970 * caused by level change
972 int delta_parity
= 0;
974 /* If a new level not explicitly given, we assume no-change */
975 if (info
->new_level
== UnSet
)
976 info
->new_level
= info
->array
.level
;
979 switch (info
->new_level
) {
985 /* chunk size is meaningful, must divide component_size
988 if (info
->component_size
% (info
->new_chunk
/512))
989 return "New chunk size does not"
990 " divide component size";
993 return "chunk size not meaningful for this level";
996 info
->new_chunk
= info
->array
.chunk_size
;
998 switch (info
->array
.level
) {
1000 return "Cannot understand this RAID level";
1002 /* RAID1 can convert to RAID1 with different disks, or
1003 * raid5 with 2 disks, or
1006 if (info
->new_level
== 0) {
1007 if (info
->delta_disks
!= UnSet
&&
1008 info
->delta_disks
!= 0)
1009 return "Cannot change number of disks "
1010 "with RAID1->RAID0 conversion";
1012 re
->before
.data_disks
= 1;
1013 re
->after
.data_disks
= 1;
1014 re
->before
.layout
= 0;
1015 re
->backup_blocks
= 0;
1019 if (info
->new_level
== 1) {
1020 if (info
->delta_disks
== UnSet
)
1021 /* Don't know what to do */
1022 return "no change requested for Growing RAID1";
1024 re
->backup_blocks
= 0;
1028 if (info
->array
.raid_disks
== 2 &&
1029 info
->new_level
== 5) {
1032 re
->before
.data_disks
= 1;
1033 if (info
->delta_disks
!= UnSet
&&
1034 info
->delta_disks
!= 0)
1035 re
->after
.data_disks
= 1 + info
->delta_disks
;
1037 re
->after
.data_disks
= 1;
1038 if (re
->after
.data_disks
< 1)
1039 return "Number of disks too small for RAID5";
1041 re
->before
.layout
= ALGORITHM_LEFT_SYMMETRIC
;
1042 info
->array
.chunk_size
= 65536;
1045 /* Could do some multi-stage conversions, but leave that to
1048 return "Impossibly level change request for RAID1";
1051 /* RAID10 can only be converted from near mode to
1052 * RAID0 by removing some devices
1054 if ((info
->array
.layout
& ~0xff) != 0x100)
1055 return "Cannot Grow RAID10 with far/offset layout";
1056 /* number of devices must be multiple of number of copies */
1057 if (info
->array
.raid_disks
% (info
->array
.layout
& 0xff))
1058 return "RAID10 layout too complex for Grow operation";
1060 if (info
->new_level
!= 0)
1061 return "RAID10 can only be changed to RAID0";
1062 new_disks
= (info
->array
.raid_disks
1063 / (info
->array
.layout
& 0xff));
1064 if (info
->delta_disks
== UnSet
)
1065 info
->delta_disks
= (new_disks
1066 - info
->array
.raid_disks
);
1068 if (info
->delta_disks
!= new_disks
- info
->array
.raid_disks
)
1069 return "New number of raid-devices impossible for RAID10";
1070 if (info
->new_chunk
&&
1071 info
->new_chunk
!= info
->array
.chunk_size
)
1072 return "Cannot change chunk-size with RAID10 Grow";
1077 re
->before
.data_disks
= new_disks
;
1078 re
->after
.data_disks
= re
->before
.data_disks
;
1079 re
->before
.layout
= 0;
1080 re
->backup_blocks
= 0;
1084 /* RAID0 can be converted to RAID10, or to RAID456 */
1085 if (info
->new_level
== 10) {
1086 if (info
->new_layout
== UnSet
&& info
->delta_disks
== UnSet
) {
1087 /* Assume near=2 layout */
1088 info
->new_layout
= 0x102;
1089 info
->delta_disks
= info
->array
.raid_disks
;
1091 if (info
->new_layout
== UnSet
) {
1092 int copies
= 1 + (info
->delta_disks
1093 / info
->array
.raid_disks
);
1094 if (info
->array
.raid_disks
* (copies
-1)
1095 != info
->delta_disks
)
1096 return "Impossible number of devices"
1097 " for RAID0->RAID10";
1098 info
->new_layout
= 0x100 + copies
;
1100 if (info
->delta_disks
== UnSet
) {
1101 int copies
= info
->new_layout
& 0xff;
1102 if (info
->new_layout
!= 0x100 + copies
)
1103 return "New layout impossible"
1104 " for RAID0->RAID10";;
1105 info
->delta_disks
= (copies
- 1) *
1106 info
->array
.raid_disks
;
1108 if (info
->new_chunk
&&
1109 info
->new_chunk
!= info
->array
.chunk_size
)
1110 return "Cannot change chunk-size with RAID0->RAID10";
1114 re
->before
.data_disks
= (info
->array
.raid_disks
+
1116 re
->after
.data_disks
= re
->before
.data_disks
;
1117 re
->before
.layout
= info
->new_layout
;
1118 re
->backup_blocks
= 0;
1122 /* RAID0 can also covert to RAID0/4/5/6 by first converting to
1123 * a raid4 style layout of the final level.
1125 switch (info
->new_level
) {
1130 re
->before
.layout
= 0;
1135 re
->before
.layout
= ALGORITHM_PARITY_N
;
1140 re
->before
.layout
= ALGORITHM_PARITY_N
;
1143 return "Impossible level change requested";
1145 re
->before
.data_disks
= info
->array
.raid_disks
;
1146 /* determining 'after' layout happens outside this 'switch' */
1150 info
->array
.layout
= ALGORITHM_PARITY_N
;
1152 switch (info
->new_level
) {
1156 re
->level
= info
->array
.level
;
1157 re
->before
.data_disks
= info
->array
.raid_disks
- 1;
1158 re
->before
.layout
= info
->array
.layout
;
1162 re
->before
.data_disks
= info
->array
.raid_disks
- 1;
1163 re
->before
.layout
= info
->array
.layout
;
1168 re
->before
.data_disks
= info
->array
.raid_disks
- 1;
1169 switch (info
->array
.layout
) {
1170 case ALGORITHM_LEFT_ASYMMETRIC
:
1171 re
->before
.layout
= ALGORITHM_LEFT_ASYMMETRIC_6
;
1173 case ALGORITHM_RIGHT_ASYMMETRIC
:
1174 re
->before
.layout
= ALGORITHM_RIGHT_ASYMMETRIC_6
;
1176 case ALGORITHM_LEFT_SYMMETRIC
:
1177 re
->before
.layout
= ALGORITHM_LEFT_SYMMETRIC_6
;
1179 case ALGORITHM_RIGHT_SYMMETRIC
:
1180 re
->before
.layout
= ALGORITHM_RIGHT_SYMMETRIC_6
;
1182 case ALGORITHM_PARITY_0
:
1183 re
->before
.layout
= ALGORITHM_PARITY_0_6
;
1185 case ALGORITHM_PARITY_N
:
1186 re
->before
.layout
= ALGORITHM_PARITY_N_6
;
1189 return "Cannot convert an array with this layout";
1193 if (info
->array
.raid_disks
!= 2)
1194 return "Can only convert a 2-device array to RAID1";
1195 if (info
->delta_disks
!= UnSet
&&
1196 info
->delta_disks
!= 0)
1197 return "Cannot set raid_disk when "
1198 "converting RAID5->RAID1";
1202 return "Impossible level change requested";
1206 switch (info
->new_level
) {
1212 re
->before
.data_disks
= info
->array
.raid_disks
- 2;
1213 re
->before
.layout
= info
->array
.layout
;
1216 return "Impossible level change requested";
1221 /* If we reached here then it looks like a re-stripe is
1222 * happening. We have determined the intermediate level
1223 * and initial raid_disks/layout and stored these in 're'.
1225 * We need to deduce the final layout that can be atomically
1226 * converted to the end state.
1228 switch (info
->new_level
) {
1230 /* We can only get to RAID0 from RAID4 or RAID5
1231 * with appropriate layout and one extra device
1233 if (re
->level
!= 4 && re
->level
!= 5)
1234 return "Cannot covert to RAID0 from this level";
1236 switch (re
->level
) {
1238 re
->after
.layout
= 0 ; break;
1240 re
->after
.layout
= ALGORITHM_PARITY_N
; break;
1245 /* We can only get to RAID4 from RAID5 */
1246 if (re
->level
!= 4 && re
->level
!= 5)
1247 return "Cannot convert to RAID4 from this level";
1249 switch (re
->level
) {
1251 re
->after
.layout
= 0 ; break;
1253 re
->after
.layout
= ALGORITHM_PARITY_N
; break;
1258 /* We get to RAID5 for RAID5 or RAID6 */
1259 if (re
->level
!= 5 && re
->level
!= 6)
1260 return "Cannot convert to RAID5 from this level";
1262 switch (re
->level
) {
1264 if (info
->new_layout
== UnSet
)
1265 re
->after
.layout
= re
->before
.layout
;
1267 re
->after
.layout
= info
->new_layout
;
1270 if (info
->new_layout
== UnSet
)
1271 info
->new_layout
= re
->before
.layout
;
1273 /* after.layout needs to be raid6 version of new_layout */
1274 if (info
->new_layout
== ALGORITHM_PARITY_N
)
1275 re
->after
.layout
= ALGORITHM_PARITY_N
;
1278 char *ls
= map_num(r5layout
, info
->new_layout
);
1280 strcat(strcpy(layout
, ls
), "-6");
1281 l
= map_name(r6layout
, layout
);
1283 return "Cannot find RAID6 layout"
1285 re
->after
.layout
= l
;
1291 /* We must already be at level 6 */
1293 return "Impossible level change";
1294 if (info
->new_layout
== UnSet
)
1295 re
->after
.layout
= info
->array
.layout
;
1297 re
->after
.layout
= info
->new_layout
;
1300 return "Impossible level change requested";
1302 if (info
->delta_disks
== UnSet
)
1303 info
->delta_disks
= delta_parity
;
1305 re
->after
.data_disks
= (re
->before
.data_disks
1308 switch (re
->level
) {
1309 case 6: re
->parity
= 2; break;
1311 case 5: re
->parity
= 1; break;
1312 default: re
->parity
= 0; break;
1314 /* So we have a restripe operation, we need to calculate the number
1315 * of blocks per reshape operation.
1317 if (info
->new_chunk
== 0)
1318 info
->new_chunk
= info
->array
.chunk_size
;
1319 if (re
->after
.data_disks
== re
->before
.data_disks
&&
1320 re
->after
.layout
== re
->before
.layout
&&
1321 info
->new_chunk
== info
->array
.chunk_size
) {
1322 /* Nothing to change */
1323 re
->backup_blocks
= 0;
1326 if (re
->after
.data_disks
== 1 && re
->before
.data_disks
== 1) {
1327 /* chunk and layout changes make no difference */
1328 re
->backup_blocks
= 0;
1332 if (re
->after
.data_disks
== re
->before
.data_disks
&&
1333 get_linux_version() < 2006032)
1334 return "in-place reshape is not safe before 2.6.32 - sorry.";
1336 if (re
->after
.data_disks
< re
->before
.data_disks
&&
1337 get_linux_version() < 2006030)
1338 return "reshape to fewer devices is not supported before 2.6.30 - sorry.";
1340 re
->backup_blocks
= compute_backup_blocks(
1341 info
->new_chunk
, info
->array
.chunk_size
,
1342 re
->after
.data_disks
,
1343 re
->before
.data_disks
);
1345 re
->new_size
= info
->component_size
* re
->after
.data_disks
;
1349 static int reshape_array(char *container
, int fd
, char *devname
,
1350 struct supertype
*st
, struct mdinfo
*info
,
1351 int force
, struct mddev_dev
*devlist
,
1352 char *backup_file
, int quiet
, int forked
,
1353 int restart
, int freeze_reshape
);
1354 static int reshape_container(char *container
, char *devname
,
1356 struct supertype
*st
,
1357 struct mdinfo
*info
,
1360 int quiet
, int restart
, int freeze_reshape
);
1362 int Grow_reshape(char *devname
, int fd
, int quiet
, char *backup_file
,
1364 int level
, char *layout_str
, int chunksize
, int raid_disks
,
1365 struct mddev_dev
*devlist
,
1366 int assume_clean
, int force
)
1368 /* Make some changes in the shape of an array.
1369 * The kernel must support the change.
1371 * There are three different changes. Each can trigger
1372 * a resync or recovery so we freeze that until we have
1373 * requested everything (if kernel supports freezing - 2.6.30).
1375 * - change size (i.e. component_size)
1377 * - change layout/chunksize/ndisks
1379 * The last can require a reshape. It is different on different
1380 * levels so we need to check the level before actioning it.
1381 * Some times the level change needs to be requested after the
1382 * reshape (e.g. raid6->raid5, raid5->raid0)
1385 struct mdu_array_info_s array
;
1387 struct supertype
*st
;
1388 char *subarray
= NULL
;
1392 char *container
= NULL
;
1393 char container_buf
[20];
1396 struct mddev_dev
*dv
;
1402 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) < 0) {
1403 fprintf(stderr
, Name
": %s is not an active md array - aborting\n",
1409 (chunksize
|| level
!= UnSet
|| layout_str
|| raid_disks
)) {
1410 fprintf(stderr
, Name
": cannot change component size at the same time "
1411 "as other changes.\n"
1412 " Change size first, then check data is intact before "
1413 "making other changes.\n");
1417 if (raid_disks
&& raid_disks
< array
.raid_disks
&& array
.level
> 1 &&
1418 get_linux_version() < 2006032 &&
1419 !check_env("MDADM_FORCE_FEWER")) {
1420 fprintf(stderr
, Name
": reducing the number of devices is not safe before Linux 2.6.32\n"
1421 " Please use a newer kernel\n");
1425 st
= super_by_fd(fd
, &subarray
);
1427 fprintf(stderr
, Name
": Unable to determine metadata format for %s\n", devname
);
1430 if (raid_disks
> st
->max_devs
) {
1431 fprintf(stderr
, Name
": Cannot increase raid-disks on this array"
1432 " beyond %d\n", st
->max_devs
);
1436 /* in the external case we need to check that the requested reshape is
1437 * supported, and perform an initial check that the container holds the
1438 * pre-requisite spare devices (mdmon owns final validation)
1440 if (st
->ss
->external
) {
1445 container_dev
= st
->container_dev
;
1446 cfd
= open_dev_excl(st
->container_dev
);
1448 container_dev
= st
->devnum
;
1450 cfd
= open_dev_excl(st
->devnum
);
1454 fprintf(stderr
, Name
": Unable to open container for %s\n",
1460 fmt_devname(container_buf
, container_dev
);
1461 container
= container_buf
;
1463 rv
= st
->ss
->load_container(st
, cfd
, NULL
);
1466 fprintf(stderr
, Name
": Cannot read superblock for %s\n",
1472 /* check if operation is supported for metadata handler */
1473 if (st
->ss
->container_content
) {
1474 struct mdinfo
*cc
= NULL
;
1475 struct mdinfo
*content
= NULL
;
1477 cc
= st
->ss
->container_content(st
, subarray
);
1478 for (content
= cc
; content
; content
= content
->next
) {
1479 int allow_reshape
= 1;
1481 /* check if reshape is allowed based on metadata
1482 * indications stored in content.array.status
1484 if (content
->array
.state
& (1<<MD_SB_BLOCK_VOLUME
))
1486 if (content
->array
.state
1487 & (1<<MD_SB_BLOCK_CONTAINER_RESHAPE
))
1489 if (!allow_reshape
) {
1490 fprintf(stderr
, Name
1491 " cannot reshape arrays in"
1492 " container with unsupported"
1493 " metadata: %s(%s)\n",
1494 devname
, container_buf
);
1502 if (mdmon_running(container_dev
))
1503 st
->update_tail
= &st
->updates
;
1507 for (dv
= devlist
; dv
; dv
= dv
->next
)
1509 if (raid_disks
> array
.raid_disks
&&
1510 array
.spare_disks
+added_disks
< (raid_disks
- array
.raid_disks
) &&
1513 Name
": Need %d spare%s to avoid degraded array,"
1514 " and only have %d.\n"
1515 " Use --force to over-ride this check.\n",
1516 raid_disks
- array
.raid_disks
,
1517 raid_disks
- array
.raid_disks
== 1 ? "" : "s",
1518 array
.spare_disks
+ added_disks
);
1522 sra
= sysfs_read(fd
, 0, GET_LEVEL
| GET_DISKS
| GET_DEVS
1523 | GET_STATE
| GET_VERSION
);
1525 if (st
->ss
->external
&& subarray
== NULL
) {
1526 array
.level
= LEVEL_CONTAINER
;
1527 sra
->array
.level
= LEVEL_CONTAINER
;
1530 fprintf(stderr
, Name
": failed to read sysfs parameters for %s\n",
1534 frozen
= freeze(st
);
1536 /* freeze() already spewed the reason */
1539 } else if (frozen
< 0) {
1540 fprintf(stderr
, Name
": %s is performing resync/recovery and cannot"
1541 " be reshaped\n", devname
);
1546 /* ========= set size =============== */
1547 if (size
>= 0 && (size
== 0 || size
!= array
.size
)) {
1548 long long orig_size
= get_component_size(fd
)/2;
1549 long long min_csize
;
1553 orig_size
= array
.size
;
1555 if (reshape_super(st
, size
, UnSet
, UnSet
, 0, 0, UnSet
, NULL
,
1562 /* Update the size of each member device in case
1563 * they have been resized. This will never reduce
1564 * below the current used-size. The "size" attribute
1565 * understands '0' to mean 'max'.
1568 for (mdi
= sra
->devs
; mdi
; mdi
= mdi
->next
) {
1569 if (sysfs_set_num(sra
, mdi
, "size", size
) < 0)
1571 if (array
.not_persistent
== 0 &&
1572 array
.major_version
== 0 &&
1573 get_linux_version() < 3001000) {
1574 /* Dangerous to allow size to exceed 2TB */
1575 unsigned long long csize
;
1576 if (sysfs_get_ll(sra
, mdi
, "size", &csize
) == 0) {
1577 if (csize
>= 2ULL*1024*1024*1024)
1578 csize
= 2ULL*1024*1024*1024;
1579 if ((min_csize
== 0 || (min_csize
1580 > (long long)csize
)))
1585 if (min_csize
&& size
> min_csize
) {
1586 fprintf(stderr
, Name
": Cannot safely make this array "
1587 "use more than 2TB per device on this kernel.\n");
1591 if (min_csize
&& size
== 0) {
1592 /* Don't let the kernel choose a size - it will get
1595 fprintf(stderr
, Name
": Limited v0.90 array to "
1596 "2TB per device\n");
1601 if (array
.size
!= size
) {
1602 /* got truncated to 32bit, write to
1603 * component_size instead
1606 rv
= sysfs_set_num(sra
, NULL
,
1607 "component_size", size
);
1611 rv
= ioctl(fd
, SET_ARRAY_INFO
, &array
);
1615 /* restore metadata */
1616 if (reshape_super(st
, orig_size
, UnSet
, UnSet
, 0, 0,
1617 UnSet
, NULL
, devname
, !quiet
) == 0)
1619 fprintf(stderr
, Name
": Cannot set device size for %s: %s\n",
1620 devname
, strerror(err
));
1622 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
1623 fprintf(stderr
, " Bitmap must be removed before size can be changed\n");
1628 /* This will fail on kernels newer than 3.0 unless
1629 * a backport has been arranged.
1632 sysfs_set_str(sra
, NULL
, "resync_start", "none") < 0)
1633 fprintf(stderr
, Name
": --assume-clean not support with --grow on this kernel\n");
1635 ioctl(fd
, GET_ARRAY_INFO
, &array
);
1636 size
= get_component_size(fd
)/2;
1640 if (size
== orig_size
)
1641 fprintf(stderr
, Name
": component size of %s "
1642 "unchanged at %lluK\n",
1645 fprintf(stderr
, Name
": component size of %s "
1646 "has been set to %lluK\n",
1650 } else if (array
.level
!= LEVEL_CONTAINER
) {
1651 size
= get_component_size(fd
)/2;
1656 /* See if there is anything else to do */
1657 if ((level
== UnSet
|| level
== array
.level
) &&
1658 (layout_str
== NULL
) &&
1659 (chunksize
== 0 || chunksize
== array
.chunk_size
) &&
1660 (raid_disks
== 0 || raid_disks
== array
.raid_disks
)) {
1661 /* Nothing more to do */
1662 if (!changed
&& !quiet
)
1663 fprintf(stderr
, Name
": %s: no change requested\n",
1668 /* ========= check for Raid10/Raid1 -> Raid0 conversion ===============
1669 * current implementation assumes that following conditions must be met:
1672 * - near_copies == 2
1674 if ((level
== 0 && array
.level
== 10 && sra
&&
1675 array
.layout
== ((1 << 8) + 2) && !(array
.raid_disks
& 1)) ||
1676 (level
== 0 && array
.level
== 1 && sra
)) {
1678 err
= remove_disks_for_takeover(st
, sra
, array
.layout
);
1680 dprintf(Name
": Array cannot be reshaped\n");
1686 /* Make sure mdmon has seen the device removal
1687 * and updated metadata before we continue with
1691 ping_monitor(container
);
1694 memset(&info
, 0, sizeof(info
));
1696 sysfs_init(&info
, fd
, NoMdDev
);
1697 strcpy(info
.text_version
, sra
->text_version
);
1698 info
.component_size
= size
*2;
1699 info
.new_level
= level
;
1700 info
.new_chunk
= chunksize
* 1024;
1701 if (info
.array
.level
== LEVEL_CONTAINER
) {
1702 info
.delta_disks
= UnSet
;
1703 info
.array
.raid_disks
= raid_disks
;
1704 } else if (raid_disks
)
1705 info
.delta_disks
= raid_disks
- info
.array
.raid_disks
;
1707 info
.delta_disks
= UnSet
;
1708 if (layout_str
== NULL
) {
1709 info
.new_layout
= UnSet
;
1710 if (info
.array
.level
== 6 &&
1711 (info
.new_level
== 6 || info
.new_level
== UnSet
) &&
1712 info
.array
.layout
>= 16) {
1713 fprintf(stderr
, Name
1714 ": %s has a non-standard layout. If you"
1715 " wish to preserve this\n"
1716 " during the reshape, please specify"
1717 " --layout=preserve\n"
1718 " If you want to change it, specify a"
1719 " layout or use --layout=normalise\n",
1724 } else if (strcmp(layout_str
, "normalise") == 0 ||
1725 strcmp(layout_str
, "normalize") == 0) {
1726 /* If we have a -6 RAID6 layout, remove the '-6'. */
1727 info
.new_layout
= UnSet
;
1728 if (info
.array
.level
== 6 && info
.new_level
== UnSet
) {
1730 strcpy(l
, map_num(r6layout
, info
.array
.layout
));
1731 h
= strrchr(l
, '-');
1732 if (h
&& strcmp(h
, "-6") == 0) {
1734 info
.new_layout
= map_name(r6layout
, l
);
1737 } else if (strcmp(layout_str
, "preserve") == 0) {
1738 info
.new_layout
= UnSet
;
1740 int l
= info
.new_level
;
1742 l
= info
.array
.level
;
1745 info
.new_layout
= map_name(r5layout
, layout_str
);
1748 info
.new_layout
= map_name(r6layout
, layout_str
);
1751 info
.new_layout
= parse_layout_10(layout_str
);
1754 info
.new_layout
= parse_layout_faulty(layout_str
);
1757 fprintf(stderr
, Name
": layout not meaningful"
1758 " with this level\n");
1762 if (info
.new_layout
== UnSet
) {
1763 fprintf(stderr
, Name
": layout %s not understood"
1764 " for this level\n",
1771 if (array
.level
== LEVEL_FAULTY
) {
1772 if (level
!= UnSet
&& level
!= array
.level
) {
1773 fprintf(stderr
, Name
": cannot change level of Faulty device\n");
1777 fprintf(stderr
, Name
": cannot set chunksize of Faulty device\n");
1780 if (raid_disks
&& raid_disks
!= 1) {
1781 fprintf(stderr
, Name
": cannot set raid_disks of Faulty device\n");
1785 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) != 0) {
1786 dprintf("Cannot get array information.\n");
1789 array
.layout
= info
.new_layout
;
1790 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
1791 fprintf(stderr
, Name
": failed to set new layout\n");
1794 printf("layout for %s set to %d\n",
1795 devname
, array
.layout
);
1797 } else if (array
.level
== LEVEL_CONTAINER
) {
1798 /* This change is to be applied to every array in the
1799 * container. This is only needed when the metadata imposes
1800 * restraints of the various arrays in the container.
1801 * Currently we only know that IMSM requires all arrays
1802 * to have the same number of devices so changing the
1803 * number of devices (On-Line Capacity Expansion) must be
1804 * performed at the level of the container
1806 rv
= reshape_container(container
, devname
, -1, st
, &info
,
1807 force
, backup_file
, quiet
, 0, 0);
1810 /* get spare devices from external metadata
1812 if (st
->ss
->external
) {
1813 struct mdinfo
*info2
;
1815 info2
= st
->ss
->container_content(st
, subarray
);
1817 info
.array
.spare_disks
=
1818 info2
->array
.spare_disks
;
1823 /* Impose these changes on a single array. First
1824 * check that the metadata is OK with the change. */
1826 if (reshape_super(st
, info
.component_size
, info
.new_level
,
1827 info
.new_layout
, info
.new_chunk
,
1828 info
.array
.raid_disks
, info
.delta_disks
,
1829 backup_file
, devname
, quiet
)) {
1834 rv
= reshape_array(container
, fd
, devname
, st
, &info
, force
,
1835 devlist
, backup_file
, quiet
, 0, 0, 0);
1845 static int reshape_array(char *container
, int fd
, char *devname
,
1846 struct supertype
*st
, struct mdinfo
*info
,
1847 int force
, struct mddev_dev
*devlist
,
1848 char *backup_file
, int quiet
, int forked
,
1849 int restart
, int freeze_reshape
)
1851 struct reshape reshape
;
1854 int orig_level
= UnSet
;
1857 struct mdu_array_info_s array
;
1860 struct mddev_dev
*dv
;
1864 unsigned long long *offsets
= NULL
;
1868 unsigned long blocks
;
1869 unsigned long cache
;
1870 unsigned long long array_size
;
1872 struct mdinfo
*sra
= NULL
;
1874 /* when reshaping a RAID0, the component_size might be zero.
1875 * So try to fix that up.
1877 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) != 0) {
1878 dprintf("Cannot get array information.\n");
1881 if (array
.level
== 0 && info
->component_size
== 0) {
1882 get_dev_size(fd
, NULL
, &array_size
);
1883 info
->component_size
= array_size
/ array
.raid_disks
;
1886 if (info
->reshape_active
) {
1887 int new_level
= info
->new_level
;
1888 info
->new_level
= UnSet
;
1889 info
->array
.raid_disks
-= info
->delta_disks
;
1890 msg
= analyse_change(info
, &reshape
);
1891 info
->new_level
= new_level
;
1892 info
->array
.raid_disks
+= info
->delta_disks
;
1894 /* Make sure the array isn't read-only */
1895 ioctl(fd
, RESTART_ARRAY_RW
, 0);
1897 msg
= analyse_change(info
, &reshape
);
1899 fprintf(stderr
, Name
": %s\n", msg
);
1903 (reshape
.level
!= info
->array
.level
||
1904 reshape
.before
.layout
!= info
->array
.layout
||
1905 reshape
.before
.data_disks
+ reshape
.parity
1906 != info
->array
.raid_disks
- info
->delta_disks
)) {
1907 fprintf(stderr
, Name
": reshape info is not in native format -"
1908 " cannot continue.\n");
1913 /* reshape already started. just skip to monitoring the reshape */
1914 if (reshape
.backup_blocks
== 0)
1918 /* The container is frozen but the array may not be.
1919 * So freeze the array so spares don't get put to the wrong use
1920 * FIXME there should probably be a cleaner separation between
1921 * freeze_array and freeze_container.
1923 sysfs_freeze_array(info
);
1924 /* Check we have enough spares to not be degraded */
1926 for (dv
= devlist
; dv
; dv
=dv
->next
)
1928 spares_needed
= max(reshape
.before
.data_disks
,
1929 reshape
.after
.data_disks
)
1930 + reshape
.parity
- array
.raid_disks
;
1933 info
->new_level
> 1 && info
->array
.level
> 1 &&
1934 spares_needed
> info
->array
.spare_disks
+ added_disks
) {
1936 Name
": Need %d spare%s to avoid degraded array,"
1937 " and only have %d.\n"
1938 " Use --force to over-ride this check.\n",
1940 spares_needed
== 1 ? "" : "s",
1941 info
->array
.spare_disks
+ added_disks
);
1944 /* Check we have enough spares to not fail */
1945 spares_needed
= max(reshape
.before
.data_disks
,
1946 reshape
.after
.data_disks
)
1948 if ((info
->new_level
> 1 || info
->new_level
== 0) &&
1949 spares_needed
> info
->array
.spare_disks
+added_disks
) {
1951 Name
": Need %d spare%s to create working array,"
1952 " and only have %d.\n",
1954 spares_needed
== 1 ? "" : "s",
1955 info
->array
.spare_disks
+ added_disks
);
1959 if (reshape
.level
!= array
.level
) {
1960 char *c
= map_num(pers
, reshape
.level
);
1965 err
= sysfs_set_str(info
, NULL
, "level", c
);
1968 fprintf(stderr
, Name
": %s: could not set level to %s\n",
1971 (info
->array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
1972 fprintf(stderr
, " Bitmap must be removed"
1973 " before level can be changed\n");
1977 fprintf(stderr
, Name
": level of %s changed to %s\n",
1979 orig_level
= array
.level
;
1980 sysfs_freeze_array(info
);
1982 if (reshape
.level
> 0 && st
->ss
->external
) {
1983 /* make sure mdmon is aware of the new level */
1984 if (!mdmon_running(st
->container_dev
))
1985 start_mdmon(st
->container_dev
);
1986 ping_monitor(container
);
1987 if (mdmon_running(st
->container_dev
) &&
1988 st
->update_tail
== NULL
)
1989 st
->update_tail
= &st
->updates
;
1992 /* ->reshape_super might have chosen some spares from the
1993 * container that it wants to be part of the new array.
1994 * We can collect them with ->container_content and give
1995 * them to the kernel.
1997 if (st
->ss
->reshape_super
&& st
->ss
->container_content
) {
1998 char *subarray
= strchr(info
->text_version
+1, '/')+1;
1999 struct mdinfo
*info2
=
2000 st
->ss
->container_content(st
, subarray
);
2004 sysfs_init(info2
, fd
, st
->devnum
);
2005 /* When increasing number of devices, we need to set
2006 * new raid_disks before adding these, or they might
2009 if (reshape
.backup_blocks
&&
2010 reshape
.after
.data_disks
> reshape
.before
.data_disks
)
2011 subarray_set_num(container
, info2
, "raid_disks",
2012 reshape
.after
.data_disks
+
2014 for (d
= info2
->devs
; d
; d
= d
->next
) {
2015 if (d
->disk
.state
== 0 &&
2016 d
->disk
.raid_disk
>= 0) {
2017 /* This is a spare that wants to
2018 * be part of the array.
2020 add_disk(fd
, st
, info2
, d
);
2026 /* We might have been given some devices to add to the
2027 * array. Now that the array has been changed to the right
2028 * level and frozen, we can safely add them.
2031 Manage_subdevs(devname
, fd
, devlist
, !quiet
,
2034 if (reshape
.backup_blocks
== 0) {
2035 /* No restriping needed, but we might need to impose
2036 * some more changes: layout, raid_disks, chunk_size
2038 /* read current array info */
2039 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) != 0) {
2040 dprintf("Cannot get array information.\n");
2043 /* compare current array info with new values and if
2044 * it is different update them to new */
2045 if (info
->new_layout
!= UnSet
&&
2046 info
->new_layout
!= array
.layout
) {
2047 array
.layout
= info
->new_layout
;
2048 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
2049 fprintf(stderr
, Name
": failed to set new layout\n");
2052 printf("layout for %s set to %d\n",
2053 devname
, array
.layout
);
2055 if (info
->delta_disks
!= UnSet
&&
2056 info
->delta_disks
!= 0 &&
2057 array
.raid_disks
!= (info
->array
.raid_disks
+ info
->delta_disks
)) {
2058 array
.raid_disks
+= info
->delta_disks
;
2059 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
2060 fprintf(stderr
, Name
": failed to set raid disks\n");
2062 } else if (!quiet
) {
2063 printf("raid_disks for %s set to %d\n",
2064 devname
, array
.raid_disks
);
2067 if (info
->new_chunk
!= 0 &&
2068 info
->new_chunk
!= array
.chunk_size
) {
2069 if (sysfs_set_num(info
, NULL
,
2070 "chunk_size", info
->new_chunk
) != 0) {
2071 fprintf(stderr
, Name
": failed to set chunk size\n");
2074 printf("chunk size for %s set to %d\n",
2075 devname
, array
.chunk_size
);
2082 * There are three possibilities.
2083 * 1/ The array will shrink.
2084 * We need to ensure the reshape will pause before reaching
2085 * the 'critical section'. We also need to fork and wait for
2086 * that to happen. When it does we
2087 * suspend/backup/complete/unfreeze
2089 * 2/ The array will not change size.
2090 * This requires that we keep a backup of a sliding window
2091 * so that we can restore data after a crash. So we need
2092 * to fork and monitor progress.
2093 * In future we will allow the data_offset to change, so
2094 * a sliding backup becomes unnecessary.
2096 * 3/ The array will grow. This is relatively easy.
2097 * However the kernel's restripe routines will cheerfully
2098 * overwrite some early data before it is safe. So we
2099 * need to make a backup of the early parts of the array
2100 * and be ready to restore it if rebuild aborts very early.
2101 * For externally managed metadata, we still need a forked
2102 * child to monitor the reshape and suspend IO over the region
2103 * that is being reshaped.
2105 * We backup data by writing it to one spare, or to a
2106 * file which was given on command line.
2108 * In each case, we first make sure that storage is available
2109 * for the required backup.
2111 * - request the shape change.
2112 * - fork to handle backup etc.
2115 /* Check that we can hold all the data */
2116 get_dev_size(fd
, NULL
, &array_size
);
2117 if (reshape
.new_size
< (array_size
/512)) {
2119 Name
": this change will reduce the size of the array.\n"
2120 " use --grow --array-size first to truncate array.\n"
2121 " e.g. mdadm --grow %s --array-size %llu\n",
2122 devname
, reshape
.new_size
/2);
2126 sra
= sysfs_read(fd
, 0,
2127 GET_COMPONENT
|GET_DEVS
|GET_OFFSET
|GET_STATE
|GET_CHUNK
|
2130 fprintf(stderr
, Name
": %s: Cannot get array details from sysfs\n",
2135 /* Decide how many blocks (sectors) for a reshape
2136 * unit. The number we have so far is just a minimum
2138 blocks
= reshape
.backup_blocks
;
2139 if (reshape
.before
.data_disks
==
2140 reshape
.after
.data_disks
) {
2141 /* Make 'blocks' bigger for better throughput, but
2142 * not so big that we reject it below.
2143 * Try for 16 megabytes
2145 while (blocks
* 32 < sra
->component_size
&&
2149 fprintf(stderr
, Name
": Need to backup %luK of critical "
2150 "section..\n", blocks
/2);
2152 if (blocks
>= sra
->component_size
/2) {
2153 fprintf(stderr
, Name
": %s: Something wrong"
2154 " - reshape aborted\n",
2159 /* Now we need to open all these devices so we can read/write.
2161 nrdisks
= max(reshape
.before
.data_disks
,
2162 reshape
.after
.data_disks
) + reshape
.parity
2163 + sra
->array
.spare_disks
;
2164 fdlist
= malloc((1+nrdisks
) * sizeof(int));
2165 offsets
= malloc((1+nrdisks
) * sizeof(offsets
[0]));
2166 if (!fdlist
|| !offsets
) {
2167 fprintf(stderr
, Name
": malloc failed: grow aborted\n");
2171 odisks
= reshape
.before
.data_disks
+ reshape
.parity
;
2172 d
= reshape_prepare_fdlist(devname
, sra
, odisks
,
2173 nrdisks
, blocks
, backup_file
,
2178 if ((st
->ss
->manage_reshape
== NULL
) ||
2179 (st
->ss
->recover_backup
== NULL
)) {
2180 if (backup_file
== NULL
) {
2181 if (reshape
.after
.data_disks
<=
2182 reshape
.before
.data_disks
) {
2183 fprintf(stderr
, Name
": %s: Cannot grow - "
2184 "need backup-file\n", devname
);
2186 } else if (sra
->array
.spare_disks
== 0) {
2187 fprintf(stderr
, Name
": %s: Cannot grow - "
2188 "need a spare or backup-file to backup "
2189 "critical section\n", devname
);
2193 if (!reshape_open_backup_file(backup_file
, fd
, devname
,
2195 fdlist
+d
, offsets
+d
,
2203 /* lastly, check that the internal stripe cache is
2204 * large enough, or it won't work.
2205 * It must hold at least 4 stripes of the larger
2208 cache
= max(info
->array
.chunk_size
, info
->new_chunk
);
2209 cache
*= 4; /* 4 stripes minimum */
2210 cache
/= 512; /* convert to sectors */
2211 disks
= min(reshape
.before
.data_disks
, reshape
.after
.data_disks
);
2212 /* make sure there is room for 'blocks' with a bit to spare */
2213 if (cache
< 16 + blocks
/ disks
)
2214 cache
= 16 + blocks
/ disks
;
2215 cache
/= (4096/512); /* Covert from sectors to pages */
2217 if (sra
->cache_size
< cache
)
2218 subarray_set_num(container
, sra
, "stripe_cache_size",
2221 /* Right, everything seems fine. Let's kick things off.
2222 * If only changing raid_disks, use ioctl, else use
2227 sra
->new_chunk
= info
->new_chunk
;
2230 sra
->reshape_progress
= info
->reshape_progress
;
2232 sra
->reshape_progress
= 0;
2233 if (reshape
.after
.data_disks
< reshape
.before
.data_disks
)
2234 /* start from the end of the new array */
2235 sra
->reshape_progress
= (sra
->component_size
2236 * reshape
.after
.data_disks
);
2239 if (info
->array
.chunk_size
== info
->new_chunk
&&
2240 reshape
.before
.layout
== reshape
.after
.layout
&&
2241 st
->ss
->external
== 0) {
2242 /* use SET_ARRAY_INFO but only if reshape hasn't started */
2243 ioctl(fd
, GET_ARRAY_INFO
, &array
);
2244 array
.raid_disks
= reshape
.after
.data_disks
+ reshape
.parity
;
2246 ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
2250 Name
": Cannot set device shape for %s: %s\n",
2251 devname
, strerror(errno
));
2254 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2256 " Bitmap must be removed before"
2257 " shape can be changed\n");
2261 } else if (!restart
) {
2262 /* set them all just in case some old 'new_*' value
2263 * persists from some earlier problem.
2266 if (sysfs_set_num(sra
, NULL
, "chunk_size", info
->new_chunk
) < 0)
2268 if (!err
&& sysfs_set_num(sra
, NULL
, "layout",
2269 reshape
.after
.layout
) < 0)
2271 if (!err
&& subarray_set_num(container
, sra
, "raid_disks",
2272 reshape
.after
.data_disks
+
2273 reshape
.parity
) < 0)
2276 fprintf(stderr
, Name
": Cannot set device shape for %s\n",
2280 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2282 " Bitmap must be removed before"
2283 " shape can be changed\n");
2288 err
= start_reshape(sra
, restart
,
2289 info
->array
.raid_disks
- reshape
.parity
);
2292 Name
": Cannot %s reshape for %s\n",
2293 restart
? "continue" : "start",
2298 sysfs_set_str(sra
, NULL
, "array_state", "active");
2299 if (freeze_reshape
) {
2303 fprintf(stderr
, Name
": Reshape has to be continued from"
2304 " location %llu when root fileststem has been mounted\n",
2305 sra
->reshape_progress
);
2309 /* Now we just need to kick off the reshape and watch, while
2310 * handling backups of the data...
2311 * This is all done by a forked background process.
2313 switch(forked
? 0 : fork()) {
2315 fprintf(stderr
, Name
": Cannot run child to monitor reshape: %s\n",
2330 if (check_env("MDADM_GROW_VERIFY"))
2331 fd
= open(devname
, O_RDONLY
| O_DIRECT
);
2334 mlockall(MCL_FUTURE
);
2336 if (st
->ss
->external
) {
2337 /* metadata handler takes it from here */
2338 done
= st
->ss
->manage_reshape(
2339 fd
, sra
, &reshape
, st
, blocks
,
2341 d
- odisks
, fdlist
+odisks
,
2344 done
= child_monitor(
2345 fd
, sra
, &reshape
, st
, blocks
,
2347 d
- odisks
, fdlist
+odisks
,
2353 if (backup_file
&& done
)
2354 unlink(backup_file
);
2360 if (!st
->ss
->external
&&
2361 !(reshape
.before
.data_disks
!= reshape
.after
.data_disks
2362 && info
->custom_array_size
) &&
2363 info
->new_level
== reshape
.level
&&
2365 /* no need to wait for the reshape to finish as
2366 * there is nothing more to do.
2373 if (st
->ss
->external
) {
2374 /* Re-load the metadata as much could have changed */
2375 int cfd
= open_dev(st
->container_dev
);
2377 ping_monitor(container
);
2378 st
->ss
->free_super(st
);
2379 st
->ss
->load_container(st
, cfd
, container
);
2384 /* set new array size if required customer_array_size is used
2387 if (reshape
.before
.data_disks
!=
2388 reshape
.after
.data_disks
&&
2389 info
->custom_array_size
) {
2390 struct mdinfo
*info2
;
2391 char *subarray
= strchr(info
->text_version
+1, '/')+1;
2393 info2
= st
->ss
->container_content(st
, subarray
);
2395 unsigned long long current_size
= 0;
2396 unsigned long long new_size
=
2397 info2
->custom_array_size
/2;
2399 if (sysfs_get_ll(sra
,
2402 ¤t_size
) == 0 &&
2403 new_size
> current_size
) {
2404 if (sysfs_set_num(sra
, NULL
,
2405 "array_size", new_size
)
2407 dprintf("Error: Cannot"
2410 dprintf("Array size "
2412 dprintf(" from %llu to %llu.\n",
2413 current_size
, new_size
);
2419 if (info
->new_level
!= reshape
.level
) {
2421 c
= map_num(pers
, info
->new_level
);
2423 err
= sysfs_set_str(sra
, NULL
, "level", c
);
2425 fprintf(stderr
, Name\
2426 ": %s: could not set level "
2427 "to %s\n", devname
, c
);
2429 if (info
->new_level
== 0)
2430 st
->update_tail
= NULL
;
2442 if (orig_level
!= UnSet
&& sra
) {
2443 c
= map_num(pers
, orig_level
);
2444 if (c
&& sysfs_set_str(sra
, NULL
, "level", c
) == 0)
2445 fprintf(stderr
, Name
": aborting level change\n");
2453 /* mdfd handle is passed to be closed in child process (after fork).
2455 int reshape_container(char *container
, char *devname
,
2457 struct supertype
*st
,
2458 struct mdinfo
*info
,
2461 int quiet
, int restart
, int freeze_reshape
)
2463 struct mdinfo
*cc
= NULL
;
2466 /* component_size is not meaningful for a container,
2467 * so pass '-1' meaning 'no change'
2470 reshape_super(st
, -1, info
->new_level
,
2471 info
->new_layout
, info
->new_chunk
,
2472 info
->array
.raid_disks
, info
->delta_disks
,
2473 backup_file
, devname
, quiet
)) {
2480 /* ping monitor to be sure that update is on disk
2482 ping_monitor(container
);
2485 case -1: /* error */
2486 perror("Cannot fork to complete reshape\n");
2489 default: /* parent */
2490 if (!freeze_reshape
)
2491 printf(Name
": multi-array reshape continues"
2492 " in background\n");
2499 /* close unused handle in child process
2505 /* For each member array with reshape_active,
2506 * we need to perform the reshape.
2507 * We pick the first array that needs reshaping and
2508 * reshape it. reshape_array() will re-read the metadata
2509 * so the next time through a different array should be
2510 * ready for reshape.
2511 * It is possible that the 'different' array will not
2512 * be assembled yet. In that case we simple exit.
2513 * When it is assembled, the mdadm which assembles it
2514 * will take over the reshape.
2516 struct mdinfo
*content
;
2518 struct mdstat_ent
*mdstat
;
2523 cc
= st
->ss
->container_content(st
, NULL
);
2525 for (content
= cc
; content
; content
= content
->next
) {
2527 if (!content
->reshape_active
)
2530 subarray
= strchr(content
->text_version
+1, '/')+1;
2531 mdstat
= mdstat_by_subdev(subarray
,
2532 devname2devnum(container
));
2540 fd
= open_dev(mdstat
->devnum
);
2543 adev
= map_dev(dev2major(mdstat
->devnum
),
2544 dev2minor(mdstat
->devnum
),
2547 adev
= content
->text_version
;
2549 sysfs_init(content
, fd
, mdstat
->devnum
);
2551 rv
= reshape_array(container
, fd
, adev
, st
,
2552 content
, force
, NULL
,
2553 backup_file
, quiet
, 1, restart
,
2557 if (freeze_reshape
) {
2565 rv
= !mdmon_running(devname2devnum(container
));
2567 printf(Name
": Mdmon is not found. "
2568 "Cannot continue container reshape.\n");
2579 * We run a child process in the background which performs the following
2581 * - wait for resync to reach a certain point
2582 * - suspend io to the following section
2583 * - backup that section
2584 * - allow resync to proceed further
2586 * - discard the backup.
2588 * When are combined in slightly different ways in the three cases.
2590 * - suspend/backup/allow/wait/resume/discard
2592 * - allow/wait/suspend/backup/allow/wait/resume/discard
2594 * - wait/resume/discard/suspend/backup/allow
2596 * suspend/backup/allow always come together
2597 * wait/resume/discard do too.
2598 * For the same-size case we have two backups to improve flow.
2602 int progress_reshape(struct mdinfo
*info
, struct reshape
*reshape
,
2603 unsigned long long backup_point
,
2604 unsigned long long wait_point
,
2605 unsigned long long *suspend_point
,
2606 unsigned long long *reshape_completed
)
2608 /* This function is called repeatedly by the reshape manager.
2609 * It determines how much progress can safely be made and allows
2611 * - 'info' identifies the array and particularly records in
2612 * ->reshape_progress the metadata's knowledge of progress
2613 * This is a sector offset from the start of the array
2614 * of the next array block to be relocated. This number
2615 * may increase from 0 or decrease from array_size, depending
2616 * on the type of reshape that is happening.
2617 * Note that in contrast, 'sync_completed' is a block count of the
2618 * reshape so far. It gives the distance between the start point
2619 * (head or tail of device) and the next place that data will be
2620 * written. It always increases.
2621 * - 'reshape' is the structure created by analyse_change
2622 * - 'backup_point' shows how much the metadata manager has backed-up
2623 * data. For reshapes with increasing progress, it is the next address
2624 * to be backed up, previous addresses have been backed-up. For
2625 * decreasing progress, it is the earliest address that has been
2626 * backed up - later address are also backed up.
2627 * So addresses between reshape_progress and backup_point are
2628 * backed up providing those are in the 'correct' order.
2629 * - 'wait_point' is an array address. When reshape_completed
2630 * passes this point, progress_reshape should return. It might
2631 * return earlier if it determines that ->reshape_progress needs
2632 * to be updated or further backup is needed.
2633 * - suspend_point is maintained by progress_reshape and the caller
2634 * should not touch it except to initialise to zero.
2635 * It is an array address and it only increases in 2.6.37 and earlier.
2636 * This makes it difficult to handle reducing reshapes with
2637 * external metadata.
2638 * However: it is similar to backup_point in that it records the
2639 * other end of a suspended region from reshape_progress.
2640 * it is moved to extend the region that is safe to backup and/or
2642 * - reshape_completed is read from sysfs and returned. The caller
2643 * should copy this into ->reshape_progress when it has reason to
2644 * believe that the metadata knows this, and any backup outside this
2648 * 1 if more data from backup_point - but only as far as suspend_point,
2649 * should be backed up
2650 * 0 if things are progressing smoothly
2651 * -1 if the reshape is finished because it is all done,
2652 * -2 if the reshape is finished due to an error.
2655 int advancing
= (reshape
->after
.data_disks
2656 >= reshape
->before
.data_disks
);
2657 unsigned long long need_backup
; /* All data between start of array and
2658 * here will at some point need to
2661 unsigned long long read_offset
, write_offset
;
2662 unsigned long long write_range
;
2663 unsigned long long max_progress
, target
, completed
;
2664 unsigned long long array_size
= (info
->component_size
2665 * reshape
->before
.data_disks
);
2669 /* First, we unsuspend any region that is now known to be safe.
2670 * If suspend_point is on the 'wrong' side of reshape_progress, then
2671 * we don't have or need suspension at the moment. This is true for
2672 * native metadata when we don't need to back-up.
2675 if (info
->reshape_progress
<= *suspend_point
)
2676 sysfs_set_num(info
, NULL
, "suspend_lo",
2677 info
->reshape_progress
);
2679 /* Note: this won't work in 2.6.37 and before.
2680 * Something somewhere should make sure we don't need it!
2682 if (info
->reshape_progress
>= *suspend_point
)
2683 sysfs_set_num(info
, NULL
, "suspend_hi",
2684 info
->reshape_progress
);
2687 /* Now work out how far it is safe to progress.
2688 * If the read_offset for ->reshape_progress is less than
2689 * 'blocks' beyond the write_offset, we can only progress as far
2691 * Otherwise we can progress until the write_offset for the new location
2692 * reaches (within 'blocks' of) the read_offset at the current location.
2693 * However that region must be suspended unless we are using native
2695 * If we need to suspend more, we limit it to 128M per device, which is
2696 * rather arbitrary and should be some time-based calculation.
2698 read_offset
= info
->reshape_progress
/ reshape
->before
.data_disks
;
2699 write_offset
= info
->reshape_progress
/ reshape
->after
.data_disks
;
2700 write_range
= info
->new_chunk
/512;
2701 if (reshape
->before
.data_disks
== reshape
->after
.data_disks
)
2702 need_backup
= array_size
;
2704 need_backup
= reshape
->backup_blocks
;
2706 if (read_offset
< write_offset
+ write_range
)
2707 max_progress
= backup_point
;
2711 reshape
->after
.data_disks
;
2713 if (read_offset
> write_offset
- write_range
)
2714 /* Can only progress as far as has been backed up,
2715 * which must be suspended */
2716 max_progress
= backup_point
;
2717 else if (info
->reshape_progress
<= need_backup
)
2718 max_progress
= backup_point
;
2720 if (info
->array
.major_version
>= 0)
2721 /* Can progress until backup is needed */
2722 max_progress
= need_backup
;
2724 /* Can progress until metadata update is required */
2727 reshape
->after
.data_disks
;
2728 /* but data must be suspended */
2729 if (max_progress
< *suspend_point
)
2730 max_progress
= *suspend_point
;
2735 /* We know it is safe to progress to 'max_progress' providing
2736 * it is suspended or we are using native metadata.
2737 * Consider extending suspend_point 128M per device if it
2738 * is less than 64M per device beyond reshape_progress.
2739 * But always do a multiple of 'blocks'
2740 * FIXME this is too big - it takes to long to complete
2743 target
= 64*1024*2 * min(reshape
->before
.data_disks
,
2744 reshape
->after
.data_disks
);
2745 target
/= reshape
->backup_blocks
;
2748 target
*= reshape
->backup_blocks
;
2750 /* For externally managed metadata we always need to suspend IO to
2751 * the area being reshaped so we regularly push suspend_point forward.
2752 * For native metadata we only need the suspend if we are going to do
2756 if ((need_backup
> info
->reshape_progress
2757 || info
->array
.major_version
< 0) &&
2758 *suspend_point
< info
->reshape_progress
+ target
) {
2759 if (need_backup
< *suspend_point
+ 2 * target
)
2760 *suspend_point
= need_backup
;
2761 else if (*suspend_point
+ 2 * target
< array_size
)
2762 *suspend_point
+= 2 * target
;
2764 *suspend_point
= array_size
;
2765 sysfs_set_num(info
, NULL
, "suspend_hi", *suspend_point
);
2766 if (max_progress
> *suspend_point
)
2767 max_progress
= *suspend_point
;
2770 if (info
->array
.major_version
>= 0) {
2771 /* Only need to suspend when about to backup */
2772 if (info
->reshape_progress
< need_backup
* 2 &&
2773 *suspend_point
> 0) {
2775 sysfs_set_num(info
, NULL
, "suspend_lo", 0);
2776 sysfs_set_num(info
, NULL
, "suspend_hi", need_backup
);
2779 /* Need to suspend continually */
2780 if (info
->reshape_progress
< *suspend_point
)
2781 *suspend_point
= info
->reshape_progress
;
2782 if (*suspend_point
+ target
< info
->reshape_progress
)
2783 /* No need to move suspend region yet */;
2785 if (*suspend_point
>= 2 * target
)
2786 *suspend_point
-= 2 * target
;
2789 sysfs_set_num(info
, NULL
, "suspend_lo",
2792 if (max_progress
< *suspend_point
)
2793 max_progress
= *suspend_point
;
2797 /* now set sync_max to allow that progress. sync_max, like
2798 * sync_completed is a count of sectors written per device, so
2799 * we find the difference between max_progress and the start point,
2800 * and divide that by after.data_disks to get a sync_max
2802 * At the same time we convert wait_point to a similar number
2803 * for comparing against sync_completed.
2805 /* scale down max_progress to per_disk */
2806 max_progress
/= reshape
->after
.data_disks
;
2807 /* Round to chunk size as some kernels give an erroneously high number */
2808 max_progress
/= info
->new_chunk
/512;
2809 max_progress
*= info
->new_chunk
/512;
2810 /* And round to old chunk size as the kernel wants that */
2811 max_progress
/= info
->array
.chunk_size
/512;
2812 max_progress
*= info
->array
.chunk_size
/512;
2813 /* Limit progress to the whole device */
2814 if (max_progress
> info
->component_size
)
2815 max_progress
= info
->component_size
;
2816 wait_point
/= reshape
->after
.data_disks
;
2818 /* switch from 'device offset' to 'processed block count' */
2819 max_progress
= info
->component_size
- max_progress
;
2820 wait_point
= info
->component_size
- wait_point
;
2823 sysfs_set_num(info
, NULL
, "sync_max", max_progress
);
2825 /* Now wait. If we have already reached the point that we were
2826 * asked to wait to, don't wait at all, else wait for any change.
2827 * We need to select on 'sync_completed' as that is the place that
2828 * notifications happen, but we are really interested in
2829 * 'reshape_position'
2831 fd
= sysfs_get_fd(info
, NULL
, "sync_completed");
2833 goto check_progress
;
2835 if (sysfs_fd_get_ll(fd
, &completed
) < 0)
2836 goto check_progress
;
2838 while (completed
< max_progress
&& completed
< wait_point
) {
2839 /* Check that sync_action is still 'reshape' to avoid
2840 * waiting forever on a dead array
2844 if (sysfs_get_str(info
, NULL
, "sync_action",
2846 strncmp(action
, "reshape", 7) != 0)
2848 /* Some kernels reset 'sync_completed' to zero
2849 * before setting 'sync_action' to 'idle'.
2850 * So we need these extra tests.
2852 if (completed
== 0 && advancing
2853 && info
->reshape_progress
> 0)
2855 if (completed
== 0 && !advancing
2856 && info
->reshape_progress
< (info
->component_size
2857 * reshape
->after
.data_disks
))
2861 select(fd
+1, NULL
, NULL
, &rfds
, NULL
);
2862 if (sysfs_fd_get_ll(fd
, &completed
) < 0)
2863 goto check_progress
;
2865 /* Some kernels reset 'sync_completed' to zero,
2866 * we need to have real point we are in md
2869 completed
= max_progress
;
2871 /* some kernels can give an incorrectly high 'completed' number */
2872 completed
/= (info
->new_chunk
/512);
2873 completed
*= (info
->new_chunk
/512);
2874 /* Convert 'completed' back in to a 'progress' number */
2875 completed
*= reshape
->after
.data_disks
;
2877 completed
= info
->component_size
* reshape
->after
.data_disks
2880 *reshape_completed
= completed
;
2884 /* We return the need_backup flag. Caller will decide
2885 * how much - a multiple of ->backup_blocks up to *suspend_point
2888 return need_backup
> info
->reshape_progress
;
2890 return need_backup
>= info
->reshape_progress
;
2893 /* if we couldn't read a number from sync_completed, then
2894 * either the reshape did complete, or it aborted.
2895 * We can tell which by checking for 'none' in reshape_position.
2896 * If it did abort, then it might immediately restart if it
2897 * it was just a device failure that leaves us degraded but
2901 if (sysfs_get_str(info
, NULL
, "reshape_position", buf
, sizeof(buf
)) < 0
2902 || strncmp(buf
, "none", 4) != 0) {
2903 /* The abort might only be temporary. Wait up to 10
2904 * seconds for fd to contain a valid number again.
2910 while (fd
>= 0 && rv
< 0 && tv
.tv_sec
> 0) {
2914 if (select(fd
+1, NULL
, NULL
, &rfds
, &tv
) != 1)
2916 switch (sysfs_fd_get_ll(fd
, &completed
)) {
2918 /* all good again */
2921 case -2: /* read error - abort */
2928 return rv
; /* abort */
2930 /* Maybe racing with array shutdown - check state */
2933 if (sysfs_get_str(info
, NULL
, "array_state", buf
, sizeof(buf
)) < 0
2934 || strncmp(buf
, "inactive", 8) == 0
2935 || strncmp(buf
, "clear",5) == 0)
2936 return -2; /* abort */
2937 return -1; /* complete */
2942 /* FIXME return status is never checked */
2943 static int grow_backup(struct mdinfo
*sra
,
2944 unsigned long long offset
, /* per device */
2945 unsigned long stripes
, /* per device, in old chunks */
2946 int *sources
, unsigned long long *offsets
,
2947 int disks
, int chunk
, int level
, int layout
,
2948 int dests
, int *destfd
, unsigned long long *destoffsets
,
2949 int part
, int *degraded
,
2952 /* Backup 'blocks' sectors at 'offset' on each device of the array,
2953 * to storage 'destfd' (offset 'destoffsets'), after first
2954 * suspending IO. Then allow resync to continue
2955 * over the suspended section.
2956 * Use part 'part' of the backup-super-block.
2961 unsigned long long ll
;
2963 //printf("offset %llu\n", offset);
2969 /* Check that array hasn't become degraded, else we might backup the wrong data */
2970 if (sysfs_get_ll(sra
, NULL
, "degraded", &ll
) < 0)
2971 return -1; /* FIXME this error is ignored */
2972 new_degraded
= (int)ll
;
2973 if (new_degraded
!= *degraded
) {
2974 /* check each device to ensure it is still working */
2976 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
2977 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
2979 if (sd
->disk
.state
& (1<<MD_DISK_SYNC
)) {
2981 if (sysfs_get_str(sra
, sd
, "state", sbuf
, 20) < 0 ||
2982 strstr(sbuf
, "faulty") ||
2983 strstr(sbuf
, "in_sync") == NULL
) {
2984 /* this device is dead */
2985 sd
->disk
.state
= (1<<MD_DISK_FAULTY
);
2986 if (sd
->disk
.raid_disk
>= 0 &&
2987 sources
[sd
->disk
.raid_disk
] >= 0) {
2988 close(sources
[sd
->disk
.raid_disk
]);
2989 sources
[sd
->disk
.raid_disk
] = -1;
2994 *degraded
= new_degraded
;
2997 bsb
.arraystart2
= __cpu_to_le64(offset
* odata
);
2998 bsb
.length2
= __cpu_to_le64(stripes
* (chunk
/512) * odata
);
3000 bsb
.arraystart
= __cpu_to_le64(offset
* odata
);
3001 bsb
.length
= __cpu_to_le64(stripes
* (chunk
/512) * odata
);
3004 bsb
.magic
[15] = '2';
3005 for (i
= 0; i
< dests
; i
++)
3007 lseek64(destfd
[i
], destoffsets
[i
] + __le64_to_cpu(bsb
.devstart2
)*512, 0);
3009 lseek64(destfd
[i
], destoffsets
[i
], 0);
3011 rv
= save_stripes(sources
, offsets
,
3012 disks
, chunk
, level
, layout
,
3014 offset
*512*odata
, stripes
* chunk
* odata
,
3019 bsb
.mtime
= __cpu_to_le64(time(0));
3020 for (i
= 0; i
< dests
; i
++) {
3021 bsb
.devstart
= __cpu_to_le64(destoffsets
[i
]/512);
3023 bsb
.sb_csum
= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
));
3024 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0)
3025 bsb
.sb_csum2
= bsb_csum((char*)&bsb
,
3026 ((char*)&bsb
.sb_csum2
)-((char*)&bsb
));
3029 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
] - 4096, 0)
3030 != destoffsets
[i
] - 4096)
3032 if (write(destfd
[i
], &bsb
, 512) != 512)
3034 if (destoffsets
[i
] > 4096) {
3035 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
]+stripes
*chunk
*odata
, 0) !=
3036 destoffsets
[i
]+stripes
*chunk
*odata
)
3038 if (write(destfd
[i
], &bsb
, 512) != 512)
3048 /* in 2.6.30, the value reported by sync_completed can be
3049 * less that it should be by one stripe.
3050 * This only happens when reshape hits sync_max and pauses.
3051 * So allow wait_backup to either extent sync_max further
3052 * than strictly necessary, or return before the
3053 * sync has got quite as far as we would really like.
3054 * This is what 'blocks2' is for.
3055 * The various caller give appropriate values so that
3058 /* FIXME return value is often ignored */
3059 static int forget_backup(
3060 int dests
, int *destfd
, unsigned long long *destoffsets
,
3064 * Erase backup 'part' (which is 0 or 1)
3070 bsb
.arraystart2
= __cpu_to_le64(0);
3071 bsb
.length2
= __cpu_to_le64(0);
3073 bsb
.arraystart
= __cpu_to_le64(0);
3074 bsb
.length
= __cpu_to_le64(0);
3076 bsb
.mtime
= __cpu_to_le64(time(0));
3078 for (i
= 0; i
< dests
; i
++) {
3079 bsb
.devstart
= __cpu_to_le64(destoffsets
[i
]/512);
3080 bsb
.sb_csum
= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
));
3081 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0)
3082 bsb
.sb_csum2
= bsb_csum((char*)&bsb
,
3083 ((char*)&bsb
.sb_csum2
)-((char*)&bsb
));
3084 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
]-4096, 0) !=
3085 destoffsets
[i
]-4096)
3088 write(destfd
[i
], &bsb
, 512) != 512)
3095 static void fail(char *msg
)
3098 rv
= (write(2, msg
, strlen(msg
)) != (int)strlen(msg
));
3099 rv
|= (write(2, "\n", 1) != 1);
3103 static char *abuf
, *bbuf
;
3104 static unsigned long long abuflen
;
3105 static void validate(int afd
, int bfd
, unsigned long long offset
)
3107 /* check that the data in the backup against the array.
3108 * This is only used for regression testing and should not
3109 * be used while the array is active
3113 lseek64(bfd
, offset
- 4096, 0);
3114 if (read(bfd
, &bsb2
, 512) != 512)
3115 fail("cannot read bsb");
3116 if (bsb2
.sb_csum
!= bsb_csum((char*)&bsb2
,
3117 ((char*)&bsb2
.sb_csum
)-((char*)&bsb2
)))
3118 fail("first csum bad");
3119 if (memcmp(bsb2
.magic
, "md_backup_data", 14) != 0)
3120 fail("magic is bad");
3121 if (memcmp(bsb2
.magic
, "md_backup_data-2", 16) == 0 &&
3122 bsb2
.sb_csum2
!= bsb_csum((char*)&bsb2
,
3123 ((char*)&bsb2
.sb_csum2
)-((char*)&bsb2
)))
3124 fail("second csum bad");
3126 if (__le64_to_cpu(bsb2
.devstart
)*512 != offset
)
3127 fail("devstart is wrong");
3130 unsigned long long len
= __le64_to_cpu(bsb2
.length
)*512;
3132 if (abuflen
< len
) {
3136 if (posix_memalign((void**)&abuf
, 4096, abuflen
) ||
3137 posix_memalign((void**)&bbuf
, 4096, abuflen
)) {
3139 /* just stop validating on mem-alloc failure */
3144 lseek64(bfd
, offset
, 0);
3145 if ((unsigned long long)read(bfd
, bbuf
, len
) != len
) {
3146 //printf("len %llu\n", len);
3147 fail("read first backup failed");
3149 lseek64(afd
, __le64_to_cpu(bsb2
.arraystart
)*512, 0);
3150 if ((unsigned long long)read(afd
, abuf
, len
) != len
)
3151 fail("read first from array failed");
3152 if (memcmp(bbuf
, abuf
, len
) != 0) {
3155 printf("offset=%llu len=%llu\n",
3156 (unsigned long long)__le64_to_cpu(bsb2
.arraystart
)*512, len
);
3157 for (i
=0; i
<len
; i
++)
3158 if (bbuf
[i
] != abuf
[i
]) {
3159 printf("first diff byte %d\n", i
);
3163 fail("data1 compare failed");
3167 unsigned long long len
= __le64_to_cpu(bsb2
.length2
)*512;
3169 if (abuflen
< len
) {
3173 abuf
= malloc(abuflen
);
3174 bbuf
= malloc(abuflen
);
3177 lseek64(bfd
, offset
+__le64_to_cpu(bsb2
.devstart2
)*512, 0);
3178 if ((unsigned long long)read(bfd
, bbuf
, len
) != len
)
3179 fail("read second backup failed");
3180 lseek64(afd
, __le64_to_cpu(bsb2
.arraystart2
)*512, 0);
3181 if ((unsigned long long)read(afd
, abuf
, len
) != len
)
3182 fail("read second from array failed");
3183 if (memcmp(bbuf
, abuf
, len
) != 0)
3184 fail("data2 compare failed");
3188 int child_monitor(int afd
, struct mdinfo
*sra
, struct reshape
*reshape
,
3189 struct supertype
*st
, unsigned long blocks
,
3190 int *fds
, unsigned long long *offsets
,
3191 int dests
, int *destfd
, unsigned long long *destoffsets
)
3193 /* Monitor a reshape where backup is being performed using
3194 * 'native' mechanism - either to a backup file, or
3195 * to some space in a spare.
3199 unsigned long long speed
;
3200 unsigned long long suspend_point
, array_size
;
3201 unsigned long long backup_point
, wait_point
;
3202 unsigned long long reshape_completed
;
3204 int increasing
= reshape
->after
.data_disks
>= reshape
->before
.data_disks
;
3205 int part
= 0; /* The next part of the backup area to fill. It may already
3206 * be full, so we need to check */
3207 int level
= reshape
->level
;
3208 int layout
= reshape
->before
.layout
;
3209 int data
= reshape
->before
.data_disks
;
3210 int disks
= reshape
->before
.data_disks
+ reshape
->parity
;
3211 int chunk
= sra
->array
.chunk_size
;
3213 unsigned long stripes
;
3216 /* set up the backup-super-block. This requires the
3217 * uuid from the array.
3219 /* Find a superblock */
3220 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
3224 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
3226 dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 1);
3227 devfd
= dev_open(dn
, O_RDONLY
);
3230 ok
= st
->ss
->load_super(st
, devfd
, NULL
);
3236 fprintf(stderr
, Name
": Cannot find a superblock\n");
3240 memset(&bsb
, 0, 512);
3241 memcpy(bsb
.magic
, "md_backup_data-1", 16);
3242 st
->ss
->uuid_from_super(st
, uuid
);
3243 memcpy(bsb
.set_uuid
, uuid
, 16);
3244 bsb
.mtime
= __cpu_to_le64(time(0));
3245 bsb
.devstart2
= blocks
;
3247 stripes
= blocks
/ (sra
->array
.chunk_size
/512) /
3248 reshape
->before
.data_disks
;
3250 if (posix_memalign((void**)&buf
, 4096, disks
* chunk
))
3251 /* Don't start the 'reshape' */
3253 if (reshape
->before
.data_disks
== reshape
->after
.data_disks
) {
3254 sysfs_get_ll(sra
, NULL
, "sync_speed_min", &speed
);
3255 sysfs_set_num(sra
, NULL
, "sync_speed_min", 200000);
3259 array_size
= sra
->component_size
* reshape
->after
.data_disks
;
3260 backup_point
= sra
->reshape_progress
;
3263 array_size
= sra
->component_size
* reshape
->before
.data_disks
;
3264 backup_point
= reshape
->backup_blocks
;
3265 suspend_point
= array_size
;
3271 /* Want to return as soon the oldest backup slot can
3272 * be released as that allows us to start backing up
3273 * some more, providing suspend_point has been
3274 * advanced, which it should have.
3277 wait_point
= array_size
;
3278 if (part
== 0 && __le64_to_cpu(bsb
.length
) > 0)
3279 wait_point
= (__le64_to_cpu(bsb
.arraystart
) +
3280 __le64_to_cpu(bsb
.length
));
3281 if (part
== 1 && __le64_to_cpu(bsb
.length2
) > 0)
3282 wait_point
= (__le64_to_cpu(bsb
.arraystart2
) +
3283 __le64_to_cpu(bsb
.length2
));
3286 if (part
== 0 && __le64_to_cpu(bsb
.length
) > 0)
3287 wait_point
= __le64_to_cpu(bsb
.arraystart
);
3288 if (part
== 1 && __le64_to_cpu(bsb
.length2
) > 0)
3289 wait_point
= __le64_to_cpu(bsb
.arraystart2
);
3292 rv
= progress_reshape(sra
, reshape
,
3293 backup_point
, wait_point
,
3294 &suspend_point
, &reshape_completed
);
3295 /* external metadata would need to ping_monitor here */
3296 sra
->reshape_progress
= reshape_completed
;
3298 /* Clear any backup region that is before 'here' */
3300 if (__le64_to_cpu(bsb
.length
) > 0 &&
3301 reshape_completed
>= (__le64_to_cpu(bsb
.arraystart
) +
3302 __le64_to_cpu(bsb
.length
)))
3303 forget_backup(dests
, destfd
,
3305 if (__le64_to_cpu(bsb
.length2
) > 0 &&
3306 reshape_completed
>= (__le64_to_cpu(bsb
.arraystart2
) +
3307 __le64_to_cpu(bsb
.length2
)))
3308 forget_backup(dests
, destfd
,
3311 if (__le64_to_cpu(bsb
.length
) > 0 &&
3312 reshape_completed
<= (__le64_to_cpu(bsb
.arraystart
)))
3313 forget_backup(dests
, destfd
,
3315 if (__le64_to_cpu(bsb
.length2
) > 0 &&
3316 reshape_completed
<= (__le64_to_cpu(bsb
.arraystart2
)))
3317 forget_backup(dests
, destfd
,
3326 if (rv
== 0 && increasing
&& !st
->ss
->external
) {
3327 /* No longer need to monitor this reshape */
3333 unsigned long long offset
;
3334 unsigned long actual_stripes
;
3335 /* Need to backup some data.
3336 * If 'part' is not used and the desired
3337 * backup size is suspended, do a backup,
3338 * then consider the next part.
3340 /* Check that 'part' is unused */
3341 if (part
== 0 && __le64_to_cpu(bsb
.length
) != 0)
3343 if (part
== 1 && __le64_to_cpu(bsb
.length2
) != 0)
3346 offset
= backup_point
/ data
;
3347 actual_stripes
= stripes
;
3349 if (offset
+ actual_stripes
* (chunk
/512) >
3350 sra
->component_size
)
3351 actual_stripes
= ((sra
->component_size
- offset
)
3353 if (offset
+ actual_stripes
* (chunk
/512) >
3357 if (offset
< actual_stripes
* (chunk
/512))
3358 actual_stripes
= offset
/ (chunk
/512);
3359 offset
-= actual_stripes
* (chunk
/512);
3360 if (offset
< suspend_point
/data
)
3363 if (actual_stripes
== 0)
3365 grow_backup(sra
, offset
, actual_stripes
,
3367 disks
, chunk
, level
, layout
,
3368 dests
, destfd
, destoffsets
,
3369 part
, °raded
, buf
);
3370 validate(afd
, destfd
[0], destoffsets
[0]);
3371 /* record where 'part' is up to */
3374 backup_point
+= actual_stripes
* (chunk
/512) * data
;
3376 backup_point
-= actual_stripes
* (chunk
/512) * data
;
3380 /* FIXME maybe call progress_reshape one more time instead */
3381 abort_reshape(sra
); /* remove any remaining suspension */
3382 if (reshape
->before
.data_disks
== reshape
->after
.data_disks
)
3383 sysfs_set_num(sra
, NULL
, "sync_speed_min", speed
);
3389 * If any spare contains md_back_data-1 which is recent wrt mtime,
3390 * write that data into the array and update the super blocks with
3391 * the new reshape_progress
3393 int Grow_restart(struct supertype
*st
, struct mdinfo
*info
, int *fdlist
, int cnt
,
3394 char *backup_file
, int verbose
)
3398 unsigned long long *offsets
;
3399 unsigned long long nstripe
, ostripe
;
3402 odata
= info
->array
.raid_disks
- info
->delta_disks
- 1;
3403 if (info
->array
.level
== 6) odata
--; /* number of data disks */
3404 ndata
= info
->array
.raid_disks
- 1;
3405 if (info
->new_level
== 6) ndata
--;
3407 old_disks
= info
->array
.raid_disks
- info
->delta_disks
;
3409 if (info
->delta_disks
<= 0)
3410 /* Didn't grow, so the backup file must have
3414 for (i
=old_disks
-(backup_file
?1:0); i
<cnt
; i
++) {
3415 struct mdinfo dinfo
;
3418 char *devname
, namebuf
[20];
3419 unsigned long long lo
, hi
;
3421 /* This was a spare and may have some saved data on it.
3422 * Load the superblock, find and load the
3423 * backup_super_block.
3424 * If either fail, go on to next device.
3425 * If the backup contains no new info, just return
3426 * else restore data and update all superblocks
3428 if (i
== old_disks
-1) {
3429 fd
= open(backup_file
, O_RDONLY
);
3431 fprintf(stderr
, Name
": backup file %s inaccessible: %s\n",
3432 backup_file
, strerror(errno
));
3435 devname
= backup_file
;
3440 if (st
->ss
->load_super(st
, fd
, NULL
))
3443 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
3444 st
->ss
->free_super(st
);
3447 (dinfo
.data_offset
+ dinfo
.component_size
- 8) <<9,
3449 fprintf(stderr
, Name
": Cannot seek on device %d\n", i
);
3450 continue; /* Cannot seek */
3452 sprintf(namebuf
, "device-%d", i
);
3455 if (read(fd
, &bsb
, sizeof(bsb
)) != sizeof(bsb
)) {
3457 fprintf(stderr
, Name
": Cannot read from %s\n", devname
);
3458 continue; /* Cannot read */
3460 if (memcmp(bsb
.magic
, "md_backup_data-1", 16) != 0 &&
3461 memcmp(bsb
.magic
, "md_backup_data-2", 16) != 0) {
3463 fprintf(stderr
, Name
": No backup metadata on %s\n", devname
);
3466 if (bsb
.sb_csum
!= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
))) {
3468 fprintf(stderr
, Name
": Bad backup-metadata checksum on %s\n", devname
);
3469 continue; /* bad checksum */
3471 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0 &&
3472 bsb
.sb_csum2
!= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum2
)-((char*)&bsb
))) {
3474 fprintf(stderr
, Name
": Bad backup-metadata checksum2 on %s\n", devname
);
3475 continue; /* Bad second checksum */
3477 if (memcmp(bsb
.set_uuid
,info
->uuid
, 16) != 0) {
3479 fprintf(stderr
, Name
": Wrong uuid on backup-metadata on %s\n", devname
);
3480 continue; /* Wrong uuid */
3483 /* array utime and backup-mtime should be updated at much the same time, but it seems that
3484 * sometimes they aren't... So allow considerable flexability in matching, and allow
3485 * this test to be overridden by an environment variable.
3487 if (info
->array
.utime
> (int)__le64_to_cpu(bsb
.mtime
) + 2*60*60 ||
3488 info
->array
.utime
< (int)__le64_to_cpu(bsb
.mtime
) - 10*60) {
3489 if (check_env("MDADM_GROW_ALLOW_OLD")) {
3490 fprintf(stderr
, Name
": accepting backup with timestamp %lu "
3491 "for array with timestamp %lu\n",
3492 (unsigned long)__le64_to_cpu(bsb
.mtime
),
3493 (unsigned long)info
->array
.utime
);
3496 fprintf(stderr
, Name
": too-old timestamp on "
3497 "backup-metadata on %s\n", devname
);
3498 continue; /* time stamp is too bad */
3502 if (bsb
.magic
[15] == '1') {
3503 if (bsb
.length
== 0)
3505 if (info
->delta_disks
>= 0) {
3506 /* reshape_progress is increasing */
3507 if (__le64_to_cpu(bsb
.arraystart
)
3508 + __le64_to_cpu(bsb
.length
)
3509 < info
->reshape_progress
) {
3512 fprintf(stderr
, Name
3513 ": backup-metadata found on %s but is not needed\n", devname
);
3514 continue; /* No new data here */
3517 /* reshape_progress is decreasing */
3518 if (__le64_to_cpu(bsb
.arraystart
) >=
3519 info
->reshape_progress
)
3520 goto nonew
; /* No new data here */
3523 if (bsb
.length
== 0 && bsb
.length2
== 0)
3525 if (info
->delta_disks
>= 0) {
3526 /* reshape_progress is increasing */
3527 if ((__le64_to_cpu(bsb
.arraystart
)
3528 + __le64_to_cpu(bsb
.length
)
3529 < info
->reshape_progress
)
3531 (__le64_to_cpu(bsb
.arraystart2
)
3532 + __le64_to_cpu(bsb
.length2
)
3533 < info
->reshape_progress
))
3534 goto nonew
; /* No new data here */
3536 /* reshape_progress is decreasing */
3537 if (__le64_to_cpu(bsb
.arraystart
) >=
3538 info
->reshape_progress
&&
3539 __le64_to_cpu(bsb
.arraystart2
) >=
3540 info
->reshape_progress
)
3541 goto nonew
; /* No new data here */
3544 if (lseek64(fd
, __le64_to_cpu(bsb
.devstart
)*512, 0)< 0) {
3547 fprintf(stderr
, Name
3548 ": Failed to verify secondary backup-metadata block on %s\n",
3550 continue; /* Cannot seek */
3552 /* There should be a duplicate backup superblock 4k before here */
3553 if (lseek64(fd
, -4096, 1) < 0 ||
3554 read(fd
, &bsb2
, sizeof(bsb2
)) != sizeof(bsb2
))
3555 goto second_fail
; /* Cannot find leading superblock */
3556 if (bsb
.magic
[15] == '1')
3557 bsbsize
= offsetof(struct mdp_backup_super
, pad1
);
3559 bsbsize
= offsetof(struct mdp_backup_super
, pad
);
3560 if (memcmp(&bsb2
, &bsb
, bsbsize
) != 0)
3561 goto second_fail
; /* Cannot find leading superblock */
3563 /* Now need the data offsets for all devices. */
3564 offsets
= malloc(sizeof(*offsets
)*info
->array
.raid_disks
);
3565 for(j
=0; j
<info
->array
.raid_disks
; j
++) {
3568 if (st
->ss
->load_super(st
, fdlist
[j
], NULL
))
3569 /* FIXME should be this be an error */
3571 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
3572 st
->ss
->free_super(st
);
3573 offsets
[j
] = dinfo
.data_offset
* 512;
3575 printf(Name
": restoring critical section\n");
3577 if (restore_stripes(fdlist
, offsets
,
3578 info
->array
.raid_disks
,
3582 fd
, __le64_to_cpu(bsb
.devstart
)*512,
3583 __le64_to_cpu(bsb
.arraystart
)*512,
3584 __le64_to_cpu(bsb
.length
)*512, NULL
)) {
3585 /* didn't succeed, so giveup */
3587 fprintf(stderr
, Name
": Error restoring backup from %s\n",
3593 if (bsb
.magic
[15] == '2' &&
3594 restore_stripes(fdlist
, offsets
,
3595 info
->array
.raid_disks
,
3599 fd
, __le64_to_cpu(bsb
.devstart
)*512 +
3600 __le64_to_cpu(bsb
.devstart2
)*512,
3601 __le64_to_cpu(bsb
.arraystart2
)*512,
3602 __le64_to_cpu(bsb
.length2
)*512, NULL
)) {
3603 /* didn't succeed, so giveup */
3605 fprintf(stderr
, Name
": Error restoring second backup from %s\n",
3613 /* Ok, so the data is restored. Let's update those superblocks. */
3617 lo
= __le64_to_cpu(bsb
.arraystart
);
3618 hi
= lo
+ __le64_to_cpu(bsb
.length
);
3620 if (bsb
.magic
[15] == '2' && bsb
.length2
) {
3621 unsigned long long lo1
, hi1
;
3622 lo1
= __le64_to_cpu(bsb
.arraystart2
);
3623 hi1
= lo1
+ __le64_to_cpu(bsb
.length2
);
3627 } else if (lo
< lo1
)
3633 (info
->reshape_progress
< lo
||
3634 info
->reshape_progress
> hi
))
3635 /* backup does not affect reshape_progress*/ ;
3636 else if (info
->delta_disks
>= 0) {
3637 info
->reshape_progress
= __le64_to_cpu(bsb
.arraystart
) +
3638 __le64_to_cpu(bsb
.length
);
3639 if (bsb
.magic
[15] == '2') {
3640 unsigned long long p2
= __le64_to_cpu(bsb
.arraystart2
) +
3641 __le64_to_cpu(bsb
.length2
);
3642 if (p2
> info
->reshape_progress
)
3643 info
->reshape_progress
= p2
;
3646 info
->reshape_progress
= __le64_to_cpu(bsb
.arraystart
);
3647 if (bsb
.magic
[15] == '2') {
3648 unsigned long long p2
= __le64_to_cpu(bsb
.arraystart2
);
3649 if (p2
< info
->reshape_progress
)
3650 info
->reshape_progress
= p2
;
3653 for (j
=0; j
<info
->array
.raid_disks
; j
++) {
3654 if (fdlist
[j
] < 0) continue;
3655 if (st
->ss
->load_super(st
, fdlist
[j
], NULL
))
3657 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
3658 dinfo
.reshape_progress
= info
->reshape_progress
;
3659 st
->ss
->update_super(st
, &dinfo
,
3660 "_reshape_progress",
3662 st
->ss
->store_super(st
, fdlist
[j
]);
3663 st
->ss
->free_super(st
);
3667 /* Didn't find any backup data, try to see if any
3670 if (info
->delta_disks
< 0) {
3671 /* When shrinking, the critical section is at the end.
3672 * So see if we are before the critical section.
3674 unsigned long long first_block
;
3675 nstripe
= ostripe
= 0;
3677 while (ostripe
>= nstripe
) {
3678 ostripe
+= info
->array
.chunk_size
/ 512;
3679 first_block
= ostripe
* odata
;
3680 nstripe
= first_block
/ ndata
/ (info
->new_chunk
/512) *
3681 (info
->new_chunk
/512);
3684 if (info
->reshape_progress
>= first_block
)
3687 if (info
->delta_disks
> 0) {
3688 /* See if we are beyond the critical section. */
3689 unsigned long long last_block
;
3690 nstripe
= ostripe
= 0;
3692 while (nstripe
>= ostripe
) {
3693 nstripe
+= info
->new_chunk
/ 512;
3694 last_block
= nstripe
* ndata
;
3695 ostripe
= last_block
/ odata
/ (info
->array
.chunk_size
/512) *
3696 (info
->array
.chunk_size
/512);
3699 if (info
->reshape_progress
>= last_block
)
3702 /* needed to recover critical section! */
3704 fprintf(stderr
, Name
": Failed to find backup of critical section\n");
3708 int Grow_continue_command(char *devname
, int fd
,
3709 char *backup_file
, int verbose
)
3712 struct supertype
*st
= NULL
;
3713 struct mdinfo
*content
= NULL
;
3714 struct mdinfo array
;
3715 char *subarray
= NULL
;
3716 struct mdinfo
*cc
= NULL
;
3717 struct mdstat_ent
*mdstat
= NULL
;
3722 unsigned long long position
;
3724 dprintf("Grow continue from command line called for %s\n",
3727 st
= super_by_fd(fd
, &subarray
);
3728 if (!st
|| !st
->ss
) {
3730 Name
": Unable to determine metadata format for %s\n",
3734 dprintf("Grow continue is run for ");
3735 if (st
->ss
->external
== 0) {
3736 dprintf("native array (%s)\n", devname
);
3737 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) < 0) {
3738 fprintf(stderr
, Name
": %s is not an active md array -"
3739 " aborting\n", devname
);
3741 goto Grow_continue_command_exit
;
3744 sysfs_init(content
, fd
, st
->devnum
);
3749 dprintf("subarray (%s)\n", subarray
);
3750 container_dev
= st
->container_dev
;
3751 cfd
= open_dev_excl(st
->container_dev
);
3753 container_dev
= st
->devnum
;
3755 cfd
= open_dev_excl(st
->devnum
);
3756 dprintf("container (%i)\n", container_dev
);
3760 fprintf(stderr
, Name
": Unable to open container "
3761 "for %s\n", devname
);
3763 goto Grow_continue_command_exit
;
3765 fmt_devname(buf
, container_dev
);
3767 /* find in container array under reshape
3769 ret_val
= st
->ss
->load_container(st
, cfd
, NULL
);
3772 Name
": Cannot read superblock for %s\n",
3775 goto Grow_continue_command_exit
;
3778 cc
= st
->ss
->container_content(st
, subarray
);
3779 for (content
= cc
; content
; content
= content
->next
) {
3781 int allow_reshape
= 1;
3783 if (content
->reshape_active
== 0)
3785 /* The decision about array or container wide
3786 * reshape is taken in Grow_continue based
3787 * content->reshape_active state, therefore we
3788 * need to check_reshape based on
3789 * reshape_active and subarray name
3791 if (content
->array
.state
& (1<<MD_SB_BLOCK_VOLUME
))
3793 if (content
->reshape_active
== CONTAINER_RESHAPE
&&
3794 (content
->array
.state
3795 & (1<<MD_SB_BLOCK_CONTAINER_RESHAPE
)))
3798 if (!allow_reshape
) {
3799 fprintf(stderr
, Name
3800 ": cannot continue reshape of an array"
3801 " in container with unsupported"
3802 " metadata: %s(%s)\n",
3805 goto Grow_continue_command_exit
;
3808 array
= strchr(content
->text_version
+1, '/')+1;
3809 mdstat
= mdstat_by_subdev(array
, container_dev
);
3816 Name
": Unable to determine reshaped "
3817 "array for %s\n", devname
);
3819 goto Grow_continue_command_exit
;
3821 fd2
= open_dev(mdstat
->devnum
);
3823 fprintf(stderr
, Name
": cannot open (md%i)\n",
3826 goto Grow_continue_command_exit
;
3829 sysfs_init(content
, fd2
, mdstat
->devnum
);
3831 /* start mdmon in case it is not running
3833 if (!mdmon_running(container_dev
))
3834 start_mdmon(container_dev
);
3837 if (mdmon_running(container_dev
))
3838 st
->update_tail
= &st
->updates
;
3840 fprintf(stderr
, Name
": No mdmon found. "
3841 "Grow cannot continue.\n");
3843 goto Grow_continue_command_exit
;
3847 /* verify that array under reshape is started from
3850 ret_val
= sysfs_get_str(content
, NULL
, "sync_max", buf
, 40);
3852 fprintf(stderr
, Name
3853 ": cannot open verify reshape progress for %s (%i)\n",
3854 content
->sys_name
, ret_val
);
3856 goto Grow_continue_command_exit
;
3858 dprintf(Name
": Read sync_max sysfs entry is: %s\n", buf
);
3859 position
= strtoull(buf
, &ep
, 0);
3860 if (ep
== buf
|| (*ep
!= 0 && *ep
!= '\n' && *ep
!= ' ')) {
3861 fprintf(stderr
, Name
": Fatal error: array reshape was"
3862 " not properly frozen\n");
3864 goto Grow_continue_command_exit
;
3866 position
*= get_data_disks(map_name(pers
, mdstat
->level
),
3867 content
->new_layout
,
3868 content
->array
.raid_disks
);
3869 if (position
!= content
->reshape_progress
) {
3870 fprintf(stderr
, Name
": Fatal error: array reshape was"
3871 " not properly frozen.\n");
3873 goto Grow_continue_command_exit
;
3878 ret_val
= Grow_continue(fd
, st
, content
, backup_file
, 0);
3880 Grow_continue_command_exit
:
3885 st
->ss
->free_super(st
);
3886 free_mdstat(mdstat
);
3893 int Grow_continue(int mdfd
, struct supertype
*st
, struct mdinfo
*info
,
3894 char *backup_file
, int freeze_reshape
)
3898 if (!info
->reshape_active
)
3901 if (st
->ss
->external
) {
3903 int cfd
= open_dev(st
->container_dev
);
3908 fmt_devname(container
, st
->container_dev
);
3909 st
->ss
->load_container(st
, cfd
, container
);
3911 ret_val
= reshape_container(container
, NULL
, mdfd
,
3912 st
, info
, 0, backup_file
,
3913 0, 1, freeze_reshape
);
3915 ret_val
= reshape_array(NULL
, mdfd
, "array", st
, info
, 1,
3916 NULL
, backup_file
, 0, 0, 1,