2 * mdadm - manage Linux "md" devices aka RAID arrays.
4 * Copyright (C) 2001-2006 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@cse.unsw.edu.au>
24 * School of Computer Science and Engineering
25 * The University of New South Wales
33 #if ! defined(__BIG_ENDIAN) && ! defined(__LITTLE_ENDIAN)
34 #error no endian defined
39 int Grow_Add_device(char *devname
, int fd
, char *newdev
)
41 /* Add a device to an active array.
42 * Currently, just extend a linear array.
43 * This requires writing a new superblock on the
44 * new device, calling the kernel to add the device,
45 * and if that succeeds, update the superblock on
47 * This means that we need to *find* all other devices.
54 struct supertype
*st
= NULL
;
57 if (ioctl(fd
, GET_ARRAY_INFO
, &info
.array
) < 0) {
58 fprintf(stderr
, Name
": cannot get array info for %s\n", devname
);
64 fprintf(stderr
, Name
": cannot handle arrays with superblock version %d\n", info
.array
.major_version
);
68 if (info
.array
.level
!= -1) {
69 fprintf(stderr
, Name
": can only add devices to linear arrays\n");
73 nfd
= open(newdev
, O_RDWR
|O_EXCL
|O_DIRECT
);
75 fprintf(stderr
, Name
": cannot open %s\n", newdev
);
79 if ((stb
.st_mode
& S_IFMT
) != S_IFBLK
) {
80 fprintf(stderr
, Name
": %s is not a block device!\n", newdev
);
84 /* now check out all the devices and make sure we can read the superblock */
85 for (d
=0 ; d
< info
.array
.raid_disks
; d
++) {
90 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0) {
91 fprintf(stderr
, Name
": cannot get device detail for device %d\n",
95 dv
= map_dev(disk
.major
, disk
.minor
, 1);
97 fprintf(stderr
, Name
": cannot find device file for device %d\n",
101 fd2
= dev_open(dv
, O_RDWR
);
103 fprintf(stderr
, Name
": cannot open device file %s\n", dv
);
106 st
->ss
->free_super(st
);
108 if (st
->ss
->load_super(st
, fd2
, NULL
)) {
109 fprintf(stderr
, Name
": cannot find super block on %s\n", dv
);
115 /* Ok, looks good. Lets update the superblock and write it out to
119 info
.disk
.number
= d
;
120 info
.disk
.major
= major(stb
.st_rdev
);
121 info
.disk
.minor
= minor(stb
.st_rdev
);
122 info
.disk
.raid_disk
= d
;
123 info
.disk
.state
= (1 << MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
);
124 st
->ss
->update_super(st
, &info
, "linear-grow-new", newdev
,
127 if (st
->ss
->store_super(st
, nfd
)) {
128 fprintf(stderr
, Name
": Cannot store new superblock on %s\n",
135 if (ioctl(fd
, ADD_NEW_DISK
, &info
.disk
) != 0) {
136 fprintf(stderr
, Name
": Cannot add new disk to this array\n");
139 /* Well, that seems to have worked.
140 * Now go through and update all superblocks
143 if (ioctl(fd
, GET_ARRAY_INFO
, &info
.array
) < 0) {
144 fprintf(stderr
, Name
": cannot get array info for %s\n", devname
);
149 for (d
=0 ; d
< info
.array
.raid_disks
; d
++) {
150 mdu_disk_info_t disk
;
154 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0) {
155 fprintf(stderr
, Name
": cannot get device detail for device %d\n",
159 dv
= map_dev(disk
.major
, disk
.minor
, 1);
161 fprintf(stderr
, Name
": cannot find device file for device %d\n",
165 fd2
= dev_open(dv
, O_RDWR
);
167 fprintf(stderr
, Name
": cannot open device file %s\n", dv
);
170 if (st
->ss
->load_super(st
, fd2
, NULL
)) {
171 fprintf(stderr
, Name
": cannot find super block on %s\n", dv
);
175 info
.array
.raid_disks
= nd
+1;
176 info
.array
.nr_disks
= nd
+1;
177 info
.array
.active_disks
= nd
+1;
178 info
.array
.working_disks
= nd
+1;
180 st
->ss
->update_super(st
, &info
, "linear-grow-update", dv
,
183 if (st
->ss
->store_super(st
, fd2
)) {
184 fprintf(stderr
, Name
": Cannot store new superblock on %s\n", dv
);
194 int Grow_addbitmap(char *devname
, int fd
, char *file
, int chunk
, int delay
, int write_behind
, int force
)
197 * First check that array doesn't have a bitmap
198 * Then create the bitmap
201 * For internal bitmaps, we need to check the version,
202 * find all the active devices, and write the bitmap block
205 mdu_bitmap_file_t bmf
;
206 mdu_array_info_t array
;
207 struct supertype
*st
;
208 int major
= BITMAP_MAJOR_HI
;
209 int vers
= md_get_version(fd
);
210 unsigned long long bitmapsize
, array_size
;
213 major
= BITMAP_MAJOR_HOSTENDIAN
;
215 fprintf(stderr
, Name
": Warning - bitmaps created on this kernel are not portable\n"
216 " between different architectured. Consider upgrading the Linux kernel.\n");
220 if (ioctl(fd
, GET_BITMAP_FILE
, &bmf
) != 0) {
222 fprintf(stderr
, Name
": Memory allocation failure.\n");
224 fprintf(stderr
, Name
": bitmaps not supported by this kernel.\n");
227 if (bmf
.pathname
[0]) {
228 if (strcmp(file
,"none")==0) {
229 if (ioctl(fd
, SET_BITMAP_FILE
, -1)!= 0) {
230 fprintf(stderr
, Name
": failed to remove bitmap %s\n",
236 fprintf(stderr
, Name
": %s already has a bitmap (%s)\n",
237 devname
, bmf
.pathname
);
240 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) != 0) {
241 fprintf(stderr
, Name
": cannot get array status for %s\n", devname
);
244 if (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)) {
245 if (strcmp(file
, "none")==0) {
246 array
.state
&= ~(1<<MD_SB_BITMAP_PRESENT
);
247 if (ioctl(fd
, SET_ARRAY_INFO
, &array
)!= 0) {
248 fprintf(stderr
, Name
": failed to remove internal bitmap.\n");
253 fprintf(stderr
, Name
": Internal bitmap already present on %s\n",
257 if (array
.level
<= 0) {
258 fprintf(stderr
, Name
": Bitmaps not meaningful with level %s\n",
259 map_num(pers
, array
.level
)?:"of this array");
262 bitmapsize
= array
.size
;
264 if (get_dev_size(fd
, NULL
, &array_size
) &&
265 array_size
> (0x7fffffffULL
<<9)) {
266 /* Array is big enough that we cannot trust array.size
267 * try other approaches
269 bitmapsize
= get_component_size(fd
);
271 if (bitmapsize
== 0) {
272 fprintf(stderr
, Name
": Cannot reliably determine size of array to create bitmap - sorry.\n");
276 if (array
.level
== 10) {
277 int ncopies
= (array
.layout
&255)*((array
.layout
>>8)&255);
278 bitmapsize
= bitmapsize
* array
.raid_disks
/ ncopies
;
281 st
= super_by_fd(fd
);
283 fprintf(stderr
, Name
": Cannot understand version %d.%d\n",
284 array
.major_version
, array
.minor_version
);
287 if (strcmp(file
, "none") == 0) {
288 fprintf(stderr
, Name
": no bitmap found on %s\n", devname
);
290 } else if (strcmp(file
, "internal") == 0) {
292 for (d
=0; d
< st
->max_devs
; d
++) {
293 mdu_disk_info_t disk
;
296 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
298 if (disk
.major
== 0 &&
301 if ((disk
.state
& (1<<MD_DISK_SYNC
))==0)
303 dv
= map_dev(disk
.major
, disk
.minor
, 1);
305 int fd2
= dev_open(dv
, O_RDWR
);
308 if (st
->ss
->load_super(st
, fd2
, NULL
)==0) {
309 if (st
->ss
->add_internal_bitmap(
311 &chunk
, delay
, write_behind
,
312 bitmapsize
, 0, major
)
314 st
->ss
->write_bitmap(st
, fd2
);
316 fprintf(stderr
, Name
": failed to create internal bitmap - chunksize problem.\n");
324 array
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
325 if (ioctl(fd
, SET_ARRAY_INFO
, &array
)!= 0) {
326 fprintf(stderr
, Name
": failed to set internal bitmap.\n");
333 int max_devs
= st
->max_devs
;
335 /* try to load a superblock */
336 for (d
=0; d
<max_devs
; d
++) {
337 mdu_disk_info_t disk
;
341 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
343 if ((disk
.major
==0 && disk
.minor
==0) ||
344 (disk
.state
& (1<<MD_DISK_REMOVED
)))
346 dv
= map_dev(disk
.major
, disk
.minor
, 1);
348 fd2
= dev_open(dv
, O_RDONLY
);
350 st
->ss
->load_super(st
, fd2
, NULL
) == 0) {
352 st
->ss
->uuid_from_super(st
, uuid
);
358 fprintf(stderr
, Name
": cannot find UUID for array!\n");
361 if (CreateBitmap(file
, force
, (char*)uuid
, chunk
,
362 delay
, write_behind
, bitmapsize
, major
)) {
365 bitmap_fd
= open(file
, O_RDWR
);
367 fprintf(stderr
, Name
": weird: %s cannot be opened\n",
371 if (ioctl(fd
, SET_BITMAP_FILE
, bitmap_fd
) < 0) {
372 fprintf(stderr
, Name
": Cannot set bitmap file for %s: %s\n",
373 devname
, strerror(errno
));
383 * When reshaping an array we might need to backup some data.
384 * This is written to all spares with a 'super_block' describing it.
385 * The superblock goes 1K form the end of the used space on the
387 * It if written after the backup is complete.
388 * It has the following structure.
391 struct mdp_backup_super
{
392 char magic
[16]; /* md_backup_data-1 or -2 */
395 /* start/sizes in 512byte sectors */
396 __u64 devstart
; /* address on backup device/file of data */
399 __u32 sb_csum
; /* csum of preceeding bytes. */
401 __u64 devstart2
; /* offset in to data of second section */
404 __u32 sb_csum2
; /* csum of preceeding bytes. */
406 } __attribute__((aligned(512))) bsb
;
408 int bsb_csum(char *buf
, int len
)
412 for (i
=0; i
<len
; i
++)
413 csum
= (csum
<<3) + buf
[0];
414 return __cpu_to_le32(csum
);
417 static int child_grow(int afd
, struct mdinfo
*sra
, unsigned long blocks
,
418 int *fds
, unsigned long long *offsets
,
419 int disks
, int chunk
, int level
, int layout
, int data
,
420 int dests
, int *destfd
, unsigned long long *destoffsets
);
421 static int child_shrink(int afd
, struct mdinfo
*sra
, unsigned long blocks
,
422 int *fds
, unsigned long long *offsets
,
423 int disks
, int chunk
, int level
, int layout
, int data
,
424 int dests
, int *destfd
, unsigned long long *destoffsets
);
425 static int child_same_size(int afd
, struct mdinfo
*sra
, unsigned long blocks
,
426 int *fds
, unsigned long long *offsets
,
427 int disks
, int chunk
, int level
, int layout
, int data
,
428 int dests
, int *destfd
, unsigned long long *destoffsets
);
430 int freeze_array(struct mdinfo
*sra
)
432 /* Try to freeze resync on this array.
433 * Return -1 if the array is busy,
434 * return 0 if this kernel doesn't support 'frozen'
435 * return 1 if it worked.
438 if (sysfs_get_str(sra
, NULL
, "sync_action", buf
, 20) <= 0)
440 if (strcmp(buf
, "idle\n") != 0 &&
441 strcmp(buf
, "frozen\n") != 0)
443 if (sysfs_set_str(sra
, NULL
, "sync_action", "frozen") < 0)
448 void unfreeze_array(struct mdinfo
*sra
, int frozen
)
450 /* If 'frozen' is 1, unfreeze the array */
452 sysfs_set_str(sra
, NULL
, "sync_action", "idle");
455 void wait_reshape(struct mdinfo
*sra
)
457 int fd
= sysfs_get_fd(sra
, NULL
, "sync_action");
464 select(fd
+1, NULL
, NULL
, &rfds
, NULL
);
466 if (sysfs_fd_get_str(fd
, action
, 20) < 0) {
470 } while (strncmp(action
, "reshape", 7) == 0);
474 int Grow_reshape(char *devname
, int fd
, int quiet
, char *backup_file
,
476 int level
, char *layout_str
, int chunksize
, int raid_disks
)
478 /* Make some changes in the shape of an array.
479 * The kernel must support the change.
481 * There are three different changes. Each can trigger
482 * a resync or recovery so we freeze that until we have
483 * requested everything (if kernel supports freezing - 2.6.30).
485 * - change size (i.e. component_size)
487 * - change layout/chunksize/ndisks
489 * The last can require a reshape. It is different on different
490 * levels so we need to check the level before actioning it.
491 * Some times the level change needs to be requested after the
492 * reshape (e.g. raid6->raid5, raid5->raid0)
495 struct mdu_array_info_s array
, orig
;
498 struct supertype
*st
;
501 int nlayout
, olayout
;
504 int orig_level
= UnSet
;
507 unsigned long long *offsets
;
512 unsigned long a
,b
, blocks
, stripes
;
514 unsigned long long array_size
;
521 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) < 0) {
522 fprintf(stderr
, Name
": %s is not an active md array - aborting\n",
526 sra
= sysfs_read(fd
, 0, GET_LEVEL
);
527 frozen
= freeze_array(sra
);
529 fprintf(stderr
, Name
": %s is performing resync/recovery and cannot"
530 " be reshaped\n", devname
);
534 /* ========= set size =============== */
535 if (size
>= 0 && (size
== 0 || size
!= array
.size
)) {
537 if (array
.size
!= size
) {
538 /* got truncated to 32bit, write to
539 * component_size instead
542 rv
= sysfs_set_num(sra
, NULL
,
543 "component_size", size
);
547 rv
= ioctl(fd
, SET_ARRAY_INFO
, &array
);
549 fprintf(stderr
, Name
": Cannot set device size for %s: %s\n",
550 devname
, strerror(errno
));
554 ioctl(fd
, GET_ARRAY_INFO
, &array
);
556 fprintf(stderr
, Name
": component size of %s has been set to %dK\n",
557 devname
, array
.size
);
561 /* ======= set level =========== */
562 if (level
!= UnSet
&& level
!= array
.level
) {
563 /* Trying to change the level.
564 * We might need to change layout first and schedule a
565 * level change for later.
566 * Level changes that can happen immediately are:
567 * 0->4,5,6 1->5 4->5,6 5->1,6
568 * Level changes that need a layout change first are:
569 * 6->5,4,0 : need a -6 layout, or parity-last
570 * 5->4,0 : need parity-last
572 if ((array
.level
== 6 || array
.level
== 5) &&
573 (level
== 5 || level
== 4 || level
== 0)) {
574 /* Don't change level yet, but choose intermediate
578 if (layout_str
== NULL
)
579 switch (array
.layout
) {
580 case ALGORITHM_LEFT_ASYMMETRIC
:
581 case ALGORITHM_LEFT_ASYMMETRIC_6
:
582 case ALGORITHM_ROTATING_N_RESTART
:
583 layout_str
= "left-asymmetric-6";
585 case ALGORITHM_LEFT_SYMMETRIC
:
586 case ALGORITHM_LEFT_SYMMETRIC_6
:
587 case ALGORITHM_ROTATING_N_CONTINUE
:
588 layout_str
= "left-symmetric-6";
590 case ALGORITHM_RIGHT_ASYMMETRIC
:
591 case ALGORITHM_RIGHT_ASYMMETRIC_6
:
592 case ALGORITHM_ROTATING_ZERO_RESTART
:
593 layout_str
= "right-asymmetric-6";
595 case ALGORITHM_RIGHT_SYMMETRIC
:
596 case ALGORITHM_RIGHT_SYMMETRIC_6
:
597 layout_str
= "right-symmetric-6";
599 case ALGORITHM_PARITY_0
:
600 case ALGORITHM_PARITY_0_6
:
601 layout_str
= "parity-first-6";
603 case ALGORITHM_PARITY_N
:
604 layout_str
= "parity-last";
607 fprintf(stderr
, Name
": %s: cannot"
608 "convert layout to RAID5 equivalent\n",
614 int l
= map_name(r5layout
, layout_str
);
616 fprintf(stderr
, Name
": %s: layout '%s' not recognised\n",
617 devname
, layout_str
);
621 if (l
!= ALGORITHM_PARITY_N
) {
622 /* need the -6 version */
623 char *ls
= map_num(r5layout
, l
);
624 strcat(strcpy(alt_layout
, ls
),
626 layout_str
= alt_layout
;
630 /* The find raid6->raid5 conversion
631 * will reduce the number of disks,
632 * so now we need to aim higher
636 layout_str
= "parity-last";
638 c
= map_num(pers
, level
);
640 return 1;/* not possible */
641 err
= sysfs_set_str(sra
, NULL
, "level", c
);
643 fprintf(stderr
, Name
": %s: could not set level to %s\n",
649 orig_level
= orig
.level
;
650 ioctl(fd
, GET_ARRAY_INFO
, &array
);
651 if (layout_str
== NULL
&&
652 orig
.level
== 5 && level
== 6 &&
653 array
.layout
!= orig
.layout
)
654 layout_str
= map_num(r5layout
, orig
.layout
);
656 fprintf(stderr
, Name
" level of %s changed to %s\n",
662 /* ========= set shape (chunk_size / layout / ndisks) ============== */
663 /* Check if layout change is a no-op */
664 if (layout_str
) switch(array
.level
) {
666 if (array
.layout
== map_name(r5layout
, layout_str
))
670 if (layout_str
== NULL
&&
671 ((chunksize
&& chunksize
* 1024 != array
.chunk_size
) ||
672 (raid_disks
&& raid_disks
!= array
.raid_disks
)) &&
673 array
.layout
>= 16) {
675 ": %s has a non-standard layout. If you wish to preserve this\n"
676 " during the reshape, please specify --layout=preserve\n"
677 " If you want to change it, specify a layout or use --layout=normalise\n",
682 if (strcmp(layout_str
, "normalise") == 0 ||
683 strcmp(layout_str
, "normalize") == 0) {
685 strcpy(alt_layout
, map_num(r6layout
, array
.layout
));
686 hyphen
= strrchr(alt_layout
, '-');
687 if (hyphen
&& strcmp(hyphen
, "-6") == 0) {
689 layout_str
= alt_layout
;
693 if (array
.layout
== map_name(r6layout
, layout_str
))
695 if (layout_str
&& strcmp(layout_str
, "preserve") == 0)
699 if (layout_str
== NULL
700 && (chunksize
== 0 || chunksize
*1024 == array
.chunk_size
)
701 && (raid_disks
== 0 || raid_disks
== array
.raid_disks
)) {
703 if (level
!= UnSet
&& level
!= array
.level
) {
704 /* Looks like this level change doesn't need
705 * a reshape after all.
707 c
= map_num(pers
, level
);
709 rv
= sysfs_set_str(sra
, NULL
, "level", c
);
711 fprintf(stderr
, Name
": %s: could not set level to %s\n",
714 } else if (!changed
&& !quiet
)
715 fprintf(stderr
, Name
": %s: no change requested\n",
720 c
= map_num(pers
, array
.level
);
721 if (c
== NULL
) c
= "-unknown-";
722 switch(array
.level
) {
723 default: /* raid0, linear, multipath cannot be reconfigured */
724 fprintf(stderr
, Name
": %s array %s cannot be reshaped.\n",
729 case LEVEL_FAULTY
: /* only 'layout' change is permitted */
731 if (chunksize
|| raid_disks
) {
732 fprintf(stderr
, Name
": %s: Cannot change chunksize or disks of a 'faulty' array\n",
737 if (layout_str
== NULL
)
738 break; /* nothing to do.... */
740 array
.layout
= parse_layout_faulty(layout_str
);
741 if (array
.layout
< 0) {
743 fprintf(stderr
, Name
": %s: layout %s not understood for 'faulty' array\n",
744 devname
, layout_str
);
748 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
749 fprintf(stderr
, Name
": Cannot set layout for %s: %s\n",
750 devname
, strerror(errno
));
753 printf("layout for %s set to %d\n", devname
, array
.layout
);
756 case 1: /* only raid_disks can each be changed. */
758 if (chunksize
|| layout_str
!= NULL
) {
759 fprintf(stderr
, Name
": %s: Cannot change chunk size or layout for a RAID1 array.\n",
764 if (raid_disks
> 0) {
765 array
.raid_disks
= raid_disks
;
766 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
767 fprintf(stderr
, Name
": Cannot set raid-devices for %s: %s\n",
768 devname
, strerror(errno
));
779 * layout/chunksize/raid_disks can be changed
780 * though the kernel may not support it all.
782 st
= super_by_fd(fd
);
785 * There are three possibilities.
786 * 1/ The array will shrink.
787 * We need to ensure the reshape will pause before reaching
788 * the 'critical section'. We also need to fork and wait for
789 * that to happen. When it does we
790 * suspend/backup/complete/unfreeze
792 * 2/ The array will not change size.
793 * This requires that we keep a backup of a sliding window
794 * so that we can restore data after a crash. So we need
795 * to fork and monitor progress.
797 * 3/ The array will grow. This is relatively easy.
798 * However the kernel's restripe routines will cheerfully
799 * overwrite some early data before it is safe. So we
800 * need to make a backup of the early parts of the array
801 * and be ready to restore it if rebuild aborts very early.
803 * We backup data by writing it to one spare, or to a
804 * file which was given on command line.
806 * [FOLLOWING IS OLD AND PARTLY WRONG]
807 * So: we enumerate the devices in the array and
808 * make sure we can open all of them.
809 * Then we freeze the early part of the array and
810 * backup to the various spares.
811 * Then we request changes and start the reshape.
812 * Monitor progress until it has passed the danger zone.
813 * and finally invalidate the copied data and unfreeze the
814 * start of the array.
816 * In each case, we first make sure that storage is available
817 * for the required backup.
819 * - request the shape change.
820 * - for to handle backup etc.
822 nchunk
= ochunk
= array
.chunk_size
;
823 nlayout
= olayout
= array
.layout
;
824 ndisks
= odisks
= array
.raid_disks
;
827 nchunk
= chunksize
* 1024;
828 if (array
.size
% chunksize
) {
829 fprintf(stderr
, Name
": component size %dK is not"
830 " a multiple of chunksize %dK\n",
831 array
.size
, chunksize
);
835 if (layout_str
!= NULL
)
836 switch(array
.level
) {
837 case 4: /* ignore layout */
840 nlayout
= map_name(r5layout
, layout_str
);
841 if (nlayout
== UnSet
) {
842 fprintf(stderr
, Name
": layout %s not understood for raid5.\n",
849 nlayout
= map_name(r6layout
, layout_str
);
850 if (nlayout
== UnSet
) {
851 fprintf(stderr
, Name
": layout %s not understood for raid6.\n",
857 if (raid_disks
) ndisks
= raid_disks
;
861 if (array
.level
== 6) {
862 odata
--; /* number of data disks */
866 /* Check that we can hold all the data */
867 size
= ndata
* array
.size
;
868 get_dev_size(fd
, NULL
, &array_size
);
869 if (size
< (array_size
/1024)) {
870 fprintf(stderr
, Name
": this change will reduce the size of the array.\n"
871 " use --grow --array-size first to truncate array.\n"
872 " e.g. mdadm --grow %s --array-size %llu\n",
878 /* So how much do we need to backup.
879 * We need an amount of data which is both a whole number of
880 * old stripes and a whole number of new stripes.
881 * So LCM for (chunksize*datadisks).
883 a
= ochunk
/512 * odata
;
884 b
= nchunk
/512 * ndata
;
892 /* LCM == product / GCD */
893 blocks
= ochunk
/512 * nchunk
/512 * odata
* ndata
/ a
;
898 fprintf(stderr
, Name
": Need to backup %luK of critical "
899 "section..\n", blocks
/2);
902 sra
= sysfs_read(fd
, 0,
903 GET_COMPONENT
|GET_DEVS
|GET_OFFSET
|GET_STATE
|
906 fprintf(stderr
, Name
": %s: Cannot get array details from sysfs\n",
912 if (blocks
>= sra
->component_size
/2) {
913 fprintf(stderr
, Name
": %s: Something wrong - reshape aborted\n",
918 nrdisks
= array
.nr_disks
+ sra
->array
.spare_disks
;
919 /* Now we need to open all these devices so we can read/write.
921 fdlist
= malloc((1+nrdisks
) * sizeof(int));
922 offsets
= malloc((1+nrdisks
) * sizeof(offsets
[0]));
923 if (!fdlist
|| !offsets
) {
924 fprintf(stderr
, Name
": malloc failed: grow aborted\n");
928 for (d
=0; d
<= nrdisks
; d
++)
930 d
= array
.raid_disks
;
931 for (sd
= sra
->devs
; sd
; sd
=sd
->next
) {
932 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
934 if (sd
->disk
.state
& (1<<MD_DISK_SYNC
)) {
935 char *dn
= map_dev(sd
->disk
.major
,
937 fdlist
[sd
->disk
.raid_disk
]
938 = dev_open(dn
, O_RDONLY
);
939 offsets
[sd
->disk
.raid_disk
] = sd
->data_offset
*512;
940 if (fdlist
[sd
->disk
.raid_disk
] < 0) {
941 fprintf(stderr
, Name
": %s: cannot open component %s\n",
942 devname
, dn
?dn
:"-unknown-");
946 } else if (backup_file
== NULL
) {
948 char *dn
= map_dev(sd
->disk
.major
,
950 fdlist
[d
] = dev_open(dn
, O_RDWR
);
951 offsets
[d
] = (sra
->component_size
- blocks
- 8)*512;
953 fprintf(stderr
, Name
": %s: cannot open component %s\n",
954 devname
, dn
?dn
:"-unknown");
961 if (backup_file
== NULL
) {
962 if (ndata
<= odata
) {
963 fprintf(stderr
, Name
": %s: Cannot grow - need backup-file\n",
967 } else if (sra
->array
.spare_disks
== 0) {
968 fprintf(stderr
, Name
": %s: Cannot grow - need a spare or "
969 "backup-file to backup critical section\n",
974 if (d
== array
.raid_disks
) {
975 fprintf(stderr
, Name
": %s: No spare device for backup\n",
981 /* need to check backup file is large enough */
983 fdlist
[d
] = open(backup_file
, O_RDWR
|O_CREAT
|O_EXCL
,
985 offsets
[d
] = 8 * 512;
987 fprintf(stderr
, Name
": %s: cannot create backup file %s: %s\n",
988 devname
, backup_file
, strerror(errno
));
993 for (i
=0; i
< blocks
+ 1 ; i
++) {
994 if (write(fdlist
[d
], buf
, 512) != 512) {
995 fprintf(stderr
, Name
": %s: cannot create backup file %s: %s\n",
996 devname
, backup_file
, strerror(errno
));
1001 if (fsync(fdlist
[d
]) != 0) {
1002 fprintf(stderr
, Name
": %s: cannot create backup file %s: %s\n",
1003 devname
, backup_file
, strerror(errno
));
1010 /* lastly, check that the internal stripe cache is
1011 * large enough, or it won't work.
1014 cache
= (nchunk
< ochunk
) ? ochunk
: nchunk
;
1015 cache
= cache
* 4 / 4096;
1016 if (sra
->cache_size
< cache
)
1017 sysfs_set_num(sra
, NULL
, "stripe_cache_size",
1019 /* Right, everything seems fine. Let's kick things off.
1020 * If only changing raid_disks, use ioctl, else use
1023 if (ochunk
== nchunk
&& olayout
== nlayout
) {
1024 array
.raid_disks
= ndisks
;
1025 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
1027 fprintf(stderr
, Name
": Cannot set device shape for %s: %s\n",
1028 devname
, strerror(errno
));
1029 if (ndisks
< odisks
&&
1030 get_linux_version() < 2006030)
1031 fprintf(stderr
, Name
": linux 2.6.30 or later required\n");
1036 /* set them all just in case some old 'new_*' value
1037 * persists from some earlier problem
1039 if (sysfs_set_num(sra
, NULL
, "chunk_size", nchunk
) < 0)
1041 if (sysfs_set_num(sra
, NULL
, "layout", nlayout
) < 0)
1043 if (sysfs_set_num(sra
, NULL
, "raid_disks", ndisks
) < 0)
1046 fprintf(stderr
, Name
": Cannot set device shape for %s\n",
1048 if (get_linux_version() < 2006030)
1049 fprintf(stderr
, Name
": linux 2.6.30 or later required\n");
1054 if (ndisks
== 2 && odisks
== 2) {
1055 /* No reshape is needed in this trivial case */
1060 /* set up the backup-super-block. This requires the
1061 * uuid from the array.
1063 /* Find a superblock */
1064 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
1068 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
1070 dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 1);
1071 devfd
= dev_open(dn
, O_RDONLY
);
1074 ok
= st
->ss
->load_super(st
, devfd
, NULL
);
1080 fprintf(stderr
, Name
": %s: Cannot find a superblock\n",
1086 memset(&bsb
, 0, 512);
1087 memcpy(bsb
.magic
, "md_backup_data-1", 16);
1088 st
->ss
->uuid_from_super(st
, (int*)&bsb
.set_uuid
);
1089 bsb
.mtime
= __cpu_to_le64(time(0));
1090 bsb
.devstart2
= blocks
;
1091 stripes
= blocks
/ (ochunk
/512) / odata
;
1092 /* Now we just need to kick off the reshape and watch, while
1093 * handling backups of the data...
1094 * This is all done by a forked background process.
1099 if (check_env("MDADM_GROW_VERIFY"))
1100 fd
= open(devname
, O_RDONLY
| O_DIRECT
);
1103 mlockall(MCL_FUTURE
);
1106 done
= child_grow(fd
, sra
, stripes
,
1108 odisks
, ochunk
, array
.level
, olayout
, odata
,
1109 d
- odisks
, fdlist
+odisks
, offsets
+odisks
);
1110 else if (odata
> ndata
)
1111 done
= child_shrink(fd
, sra
, stripes
,
1113 odisks
, ochunk
, array
.level
, olayout
, odata
,
1114 d
- odisks
, fdlist
+odisks
, offsets
+odisks
);
1116 done
= child_same_size(fd
, sra
, stripes
,
1118 odisks
, ochunk
, array
.level
, olayout
, odata
,
1119 d
- odisks
, fdlist
+odisks
, offsets
+odisks
);
1120 if (backup_file
&& done
)
1121 unlink(backup_file
);
1122 if (level
!= UnSet
&& level
!= array
.level
) {
1123 /* We need to wait for the reshape to finish
1124 * (which will have happened unless odata < ndata)
1125 * and then set the level
1128 c
= map_num(pers
, level
);
1130 exit(0);/* not possible */
1134 err
= sysfs_set_str(sra
, NULL
, "level", c
);
1136 fprintf(stderr
, Name
": %s: could not set level to %s\n",
1141 fprintf(stderr
, Name
": Cannot run child to monitor reshape: %s\n",
1146 /* The child will take care of unfreezing the array */
1155 if (rv
&& orig_level
!= UnSet
&& sra
) {
1156 c
= map_num(pers
, orig_level
);
1157 if (c
&& sysfs_set_str(sra
, NULL
, "level", c
) == 0)
1158 fprintf(stderr
, Name
": aborting level change\n");
1161 unfreeze_array(sra
, frozen
);
1166 * We run a child process in the background which performs the following
1168 * - wait for resync to reach a certain point
1169 * - suspend io to the following section
1170 * - backup that section
1171 * - allow resync to proceed further
1173 * - discard the backup.
1175 * When are combined in slightly different ways in the three cases.
1177 * - suspend/backup/allow/wait/resume/discard
1179 * - allow/wait/suspend/backup/allow/wait/resume/discard
1181 * - wait/resume/discard/suspend/backup/allow
1183 * suspend/backup/allow always come together
1184 * wait/resume/discard do too.
1185 * For the same-size case we have two backups to improve flow.
1189 int grow_backup(struct mdinfo
*sra
,
1190 unsigned long long offset
, /* per device */
1191 unsigned long stripes
, /* per device */
1192 int *sources
, unsigned long long *offsets
,
1193 int disks
, int chunk
, int level
, int layout
,
1194 int dests
, int *destfd
, unsigned long long *destoffsets
,
1198 /* Backup 'blocks' sectors at 'offset' on each device of the array,
1199 * to storage 'destfd' (offset 'destoffsets'), after first
1200 * suspending IO. Then allow resync to continue
1201 * over the suspended section.
1202 * Use part 'part' of the backup-super-block.
1207 //printf("offset %llu\n", offset);
1212 sysfs_set_num(sra
, NULL
, "suspend_hi", (offset
+ stripes
* chunk
/512) * odata
);
1214 bsb
.arraystart2
= __cpu_to_le64(offset
* odata
);
1215 bsb
.length2
= __cpu_to_le64(stripes
* chunk
/512 * odata
);
1217 bsb
.arraystart
= __cpu_to_le64(offset
* odata
);
1218 bsb
.length
= __cpu_to_le64(stripes
* chunk
/512 * odata
);
1221 bsb
.magic
[15] = '2';
1222 for (i
= 0; i
< dests
; i
++)
1224 lseek64(destfd
[i
], destoffsets
[i
] + __le64_to_cpu(bsb
.devstart2
)*512, 0);
1226 lseek64(destfd
[i
], destoffsets
[i
], 0);
1228 rv
= save_stripes(sources
, offsets
,
1229 disks
, chunk
, level
, layout
,
1231 offset
*512*odata
, stripes
* chunk
* odata
,
1236 for (i
= 0; i
< dests
; i
++) {
1237 bsb
.devstart
= __cpu_to_le64(destoffsets
[i
]/512);
1239 bsb
.sb_csum
= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
));
1240 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0)
1241 bsb
.sb_csum2
= bsb_csum((char*)&bsb
,
1242 ((char*)&bsb
.sb_csum2
)-((char*)&bsb
));
1244 lseek64(destfd
[i
], destoffsets
[i
] - 4096, 0);
1245 write(destfd
[i
], &bsb
, 512);
1252 /* in 2.6.30, the value reported by sync_completed can be
1253 * less that it should be by one stripe.
1254 * This only happens when reshape hits sync_max and pauses.
1255 * So allow wait_backup to either extent sync_max further
1256 * than strictly necessary, or return before the
1257 * sync has got quite as far as we would really like.
1258 * This is what 'blocks2' is for.
1259 * The various caller give appropriate values so that
1262 int wait_backup(struct mdinfo
*sra
,
1263 unsigned long long offset
, /* per device */
1264 unsigned long long blocks
, /* per device */
1265 unsigned long long blocks2
, /* per device - hack */
1266 int dests
, int *destfd
, unsigned long long *destoffsets
,
1269 /* Wait for resync to pass the section that was backed up
1270 * then erase the backup and allow IO
1272 int fd
= sysfs_get_fd(sra
, NULL
, "sync_completed");
1273 unsigned long long completed
;
1278 sysfs_set_num(sra
, NULL
, "sync_max", offset
+ blocks
+ blocks2
);
1280 sysfs_set_str(sra
, NULL
, "sync_action", "reshape");
1286 select(fd
+1, NULL
, NULL
, &rfds
, NULL
);
1287 if (sysfs_fd_get_ll(fd
, &completed
) < 0) {
1291 if (sysfs_get_str(sra
, NULL
, "sync_action",
1293 strncmp(action
, "reshape", 7) != 0)
1295 } while (completed
< offset
+ blocks
);
1299 bsb
.arraystart2
= __cpu_to_le64(0);
1300 bsb
.length2
= __cpu_to_le64(0);
1302 bsb
.arraystart
= __cpu_to_le64(0);
1303 bsb
.length
= __cpu_to_le64(0);
1305 for (i
= 0; i
< dests
; i
++) {
1306 bsb
.devstart
= __cpu_to_le64(destoffsets
[i
]/512);
1307 bsb
.sb_csum
= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
));
1308 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0)
1309 bsb
.sb_csum2
= bsb_csum((char*)&bsb
,
1310 ((char*)&bsb
.sb_csum2
)-((char*)&bsb
));
1311 lseek64(destfd
[i
], destoffsets
[i
]-4096, 0);
1312 write(destfd
[i
], &bsb
, 512);
1318 static void fail(char *msg
)
1320 write(2, msg
, strlen(msg
));
1325 static char *abuf
, *bbuf
;
1327 static void validate(int afd
, int bfd
, unsigned long long offset
)
1329 /* check that the data in the backup against the array.
1330 * This is only used for regression testing and should not
1331 * be used while the array is active
1333 struct mdp_backup_super bsb2
;
1336 lseek64(bfd
, offset
- 4096, 0);
1337 if (read(bfd
, &bsb2
, 512) != 512)
1338 fail("cannot read bsb");
1339 if (bsb2
.sb_csum
!= bsb_csum((char*)&bsb2
,
1340 ((char*)&bsb2
.sb_csum
)-((char*)&bsb2
)))
1341 fail("first csum bad");
1342 if (memcmp(bsb2
.magic
, "md_backup_data", 14) != 0)
1343 fail("magic is bad");
1344 if (memcmp(bsb2
.magic
, "md_backup_data-2", 16) == 0 &&
1345 bsb2
.sb_csum2
!= bsb_csum((char*)&bsb2
,
1346 ((char*)&bsb2
.sb_csum2
)-((char*)&bsb2
)))
1347 fail("second csum bad");
1349 if (__le64_to_cpu(bsb2
.devstart
)*512 != offset
)
1350 fail("devstart is wrong");
1353 unsigned long long len
= __le64_to_cpu(bsb2
.length
)*512;
1355 if (abuflen
< len
) {
1359 posix_memalign((void**)&abuf
, 4096, abuflen
);
1360 posix_memalign((void**)&bbuf
, 4096, abuflen
);
1363 lseek64(bfd
, offset
, 0);
1364 if (read(bfd
, bbuf
, len
) != len
) {
1365 printf("len %llu\n", len
);
1366 fail("read first backup failed");
1368 lseek64(afd
, __le64_to_cpu(bsb2
.arraystart
)*512, 0);
1369 if (read(afd
, abuf
, len
) != len
)
1370 fail("read first from array failed");
1371 if (memcmp(bbuf
, abuf
, len
) != 0) {
1373 printf("offset=%llu len=%llu\n",
1374 __le64_to_cpu(bsb2
.arraystart
)*512, len
);
1375 for (i
=0; i
<len
; i
++)
1376 if (bbuf
[i
] != abuf
[i
]) {
1377 printf("first diff byte %d\n", i
);
1380 fail("data1 compare failed");
1384 unsigned long long len
= __le64_to_cpu(bsb2
.length2
)*512;
1386 if (abuflen
< len
) {
1390 abuf
= malloc(abuflen
);
1391 bbuf
= malloc(abuflen
);
1394 lseek64(bfd
, offset
+__le64_to_cpu(bsb2
.devstart2
)*512, 0);
1395 if (read(bfd
, bbuf
, len
) != len
)
1396 fail("read second backup failed");
1397 lseek64(afd
, __le64_to_cpu(bsb2
.arraystart2
)*512, 0);
1398 if (read(afd
, abuf
, len
) != len
)
1399 fail("read second from array failed");
1400 if (memcmp(bbuf
, abuf
, len
) != 0)
1401 fail("data2 compare failed");
1405 static int child_grow(int afd
, struct mdinfo
*sra
, unsigned long stripes
,
1406 int *fds
, unsigned long long *offsets
,
1407 int disks
, int chunk
, int level
, int layout
, int data
,
1408 int dests
, int *destfd
, unsigned long long *destoffsets
)
1412 posix_memalign((void**)&buf
, 4096, disks
* chunk
);
1413 sysfs_set_num(sra
, NULL
, "suspend_hi", 0);
1414 sysfs_set_num(sra
, NULL
, "suspend_lo", 0);
1415 grow_backup(sra
, 0, stripes
,
1416 fds
, offsets
, disks
, chunk
, level
, layout
,
1417 dests
, destfd
, destoffsets
,
1419 validate(afd
, destfd
[0], destoffsets
[0]);
1420 if (wait_backup(sra
, 0, stripes
* chunk
/ 512, stripes
* chunk
/ 512,
1421 dests
, destfd
, destoffsets
,
1424 sysfs_set_num(sra
, NULL
, "suspend_lo", (stripes
* chunk
/512) * data
);
1426 /* FIXME this should probably be numeric */
1427 sysfs_set_str(sra
, NULL
, "sync_max", "max");
1431 static int child_shrink(int afd
, struct mdinfo
*sra
, unsigned long stripes
,
1432 int *fds
, unsigned long long *offsets
,
1433 int disks
, int chunk
, int level
, int layout
, int data
,
1434 int dests
, int *destfd
, unsigned long long *destoffsets
)
1437 unsigned long long start
;
1440 posix_memalign((void**)&buf
, 4096, disks
* chunk
);
1441 start
= sra
->component_size
- stripes
* chunk
/512;
1442 sysfs_set_num(sra
, NULL
, "sync_max", start
);
1443 sysfs_set_str(sra
, NULL
, "sync_action", "reshape");
1444 sysfs_set_num(sra
, NULL
, "suspend_lo", 0);
1445 sysfs_set_num(sra
, NULL
, "suspend_hi", 0);
1446 rv
= wait_backup(sra
, 0, start
- stripes
* chunk
/512, stripes
* chunk
/512,
1447 dests
, destfd
, destoffsets
, 0);
1450 grow_backup(sra
, 0, stripes
,
1452 disks
, chunk
, level
, layout
,
1453 dests
, destfd
, destoffsets
,
1455 validate(afd
, destfd
[0], destoffsets
[0]);
1456 rv
= wait_backup(sra
, start
, stripes
*chunk
/512, 0,
1457 dests
, destfd
, destoffsets
, 0);
1460 sysfs_set_num(sra
, NULL
, "suspend_lo", (stripes
* chunk
/512) * data
);
1462 /* FIXME this should probably be numeric */
1463 sysfs_set_str(sra
, NULL
, "sync_max", "max");
1467 static int child_same_size(int afd
, struct mdinfo
*sra
, unsigned long stripes
,
1468 int *fds
, unsigned long long *offsets
,
1469 int disks
, int chunk
, int level
, int layout
, int data
,
1470 int dests
, int *destfd
, unsigned long long *destoffsets
)
1472 unsigned long long start
, size
;
1473 unsigned long tailstripes
= stripes
;
1476 unsigned long long speed
;
1479 posix_memalign((void**)&buf
, 4096, disks
* chunk
);
1481 sysfs_set_num(sra
, NULL
, "suspend_lo", 0);
1482 sysfs_set_num(sra
, NULL
, "suspend_hi", 0);
1484 sysfs_get_ll(sra
, NULL
, "sync_speed_min", &speed
);
1485 sysfs_set_num(sra
, NULL
, "sync_speed_min", 200000);
1487 grow_backup(sra
, 0, stripes
,
1489 disks
, chunk
, level
, layout
,
1490 dests
, destfd
, destoffsets
,
1492 grow_backup(sra
, stripes
* chunk
/512, stripes
,
1494 disks
, chunk
, level
, layout
,
1495 dests
, destfd
, destoffsets
,
1497 validate(afd
, destfd
[0], destoffsets
[0]);
1499 start
= stripes
* 2; /* where to read next */
1500 size
= sra
->component_size
/ (chunk
/512);
1501 while (start
< size
) {
1502 if (wait_backup(sra
, (start
-stripes
*2)*chunk
/512,
1503 stripes
*chunk
/512, 0,
1504 dests
, destfd
, destoffsets
,
1507 sysfs_set_num(sra
, NULL
, "suspend_lo", start
*chunk
/512 * data
);
1508 if (start
+ stripes
> size
)
1509 tailstripes
= (size
- start
);
1511 grow_backup(sra
, start
*chunk
/512, tailstripes
,
1513 disks
, chunk
, level
, layout
,
1514 dests
, destfd
, destoffsets
,
1518 validate(afd
, destfd
[0], destoffsets
[0]);
1520 if (wait_backup(sra
, (start
-stripes
*2) * chunk
/512, stripes
* chunk
/512, 0,
1521 dests
, destfd
, destoffsets
,
1524 sysfs_set_num(sra
, NULL
, "suspend_lo", ((start
-stripes
)*chunk
/512) * data
);
1525 if (wait_backup(sra
, (start
-stripes
) * chunk
/512, tailstripes
* chunk
/512, 0,
1526 dests
, destfd
, destoffsets
,
1529 sysfs_set_num(sra
, NULL
, "suspend_lo", (size
*chunk
/512) * data
);
1530 sysfs_set_num(sra
, NULL
, "sync_speed_min", speed
);
1536 * If any spare contains md_back_data-1 which is recent wrt mtime,
1537 * write that data into the array and update the super blocks with
1538 * the new reshape_progress
1540 int Grow_restart(struct supertype
*st
, struct mdinfo
*info
, int *fdlist
, int cnt
, char *backup_file
)
1544 unsigned long long *offsets
;
1545 unsigned long long nstripe
, ostripe
, last_block
;
1548 if (info
->delta_disks
< 0)
1549 return 1; /* cannot handle a shrink */
1550 if (info
->new_level
!= info
->array
.level
||
1551 info
->new_layout
!= info
->array
.layout
||
1552 info
->new_chunk
!= info
->array
.chunk_size
)
1553 return 1; /* Can only handle change in disks */
1555 old_disks
= info
->array
.raid_disks
- info
->delta_disks
;
1557 for (i
=old_disks
-(backup_file
?1:0); i
<cnt
; i
++) {
1558 struct mdinfo dinfo
;
1562 /* This was a spare and may have some saved data on it.
1563 * Load the superblock, find and load the
1564 * backup_super_block.
1565 * If either fail, go on to next device.
1566 * If the backup contains no new info, just return
1567 * else restore data and update all superblocks
1569 if (i
== old_disks
-1) {
1570 fd
= open(backup_file
, O_RDONLY
);
1577 if (st
->ss
->load_super(st
, fd
, NULL
))
1580 st
->ss
->getinfo_super(st
, &dinfo
);
1581 st
->ss
->free_super(st
);
1584 (dinfo
.data_offset
+ dinfo
.component_size
- 8) <<9,
1586 continue; /* Cannot seek */
1588 if (read(fd
, &bsb
, sizeof(bsb
)) != sizeof(bsb
))
1589 continue; /* Cannot read */
1590 if (memcmp(bsb
.magic
, "md_backup_data-1", 16) != 0)
1592 if (bsb
.sb_csum
!= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
)))
1593 continue; /* bad checksum */
1594 if (memcmp(bsb
.set_uuid
,info
->uuid
, 16) != 0)
1595 continue; /* Wrong uuid */
1597 if (info
->array
.utime
> __le64_to_cpu(bsb
.mtime
) + 3600 ||
1598 info
->array
.utime
< __le64_to_cpu(bsb
.mtime
))
1599 continue; /* time stamp is too bad */
1601 if (__le64_to_cpu(bsb
.arraystart
) != 0)
1602 continue; /* Can only handle backup from start of array */
1603 if (__le64_to_cpu(bsb
.length
) <
1604 info
->reshape_progress
)
1605 continue; /* No new data here */
1607 if (lseek64(fd
, __le64_to_cpu(bsb
.devstart
)*512, 0)< 0)
1608 continue; /* Cannot seek */
1609 /* There should be a duplicate backup superblock 4k before here */
1610 if (lseek64(fd
, -4096, 1) < 0 ||
1611 read(fd
, buf
, 4096) != 4096 ||
1612 memcmp(buf
, &bsb
, sizeof(bsb
)) != 0)
1613 continue; /* Cannot find leading superblock */
1615 /* Now need the data offsets for all devices. */
1616 offsets
= malloc(sizeof(*offsets
)*info
->array
.raid_disks
);
1617 for(j
=0; j
<info
->array
.raid_disks
; j
++) {
1620 if (st
->ss
->load_super(st
, fdlist
[j
], NULL
))
1621 /* FIXME should be this be an error */
1623 st
->ss
->getinfo_super(st
, &dinfo
);
1624 st
->ss
->free_super(st
);
1625 offsets
[j
] = dinfo
.data_offset
;
1627 printf(Name
": restoring critical section\n");
1629 if (restore_stripes(fdlist
, offsets
,
1630 info
->array
.raid_disks
,
1634 fd
, __le64_to_cpu(bsb
.devstart
)*512,
1635 0, __le64_to_cpu(bsb
.length
)*512)) {
1636 /* didn't succeed, so giveup */
1640 /* Ok, so the data is restored. Let's update those superblocks. */
1642 for (j
=0; j
<info
->array
.raid_disks
; j
++) {
1643 if (fdlist
[j
] < 0) continue;
1644 if (st
->ss
->load_super(st
, fdlist
[j
], NULL
))
1646 st
->ss
->getinfo_super(st
, &dinfo
);
1647 dinfo
.reshape_progress
= __le64_to_cpu(bsb
.length
);
1648 st
->ss
->update_super(st
, &dinfo
,
1649 "_reshape_progress",
1651 st
->ss
->store_super(st
, fdlist
[j
]);
1652 st
->ss
->free_super(st
);
1655 /* And we are done! */
1658 /* Didn't find any backup data, try to see if any
1661 nstripe
= ostripe
= 0;
1662 odata
= info
->array
.raid_disks
- info
->delta_disks
- 1;
1663 if (info
->array
.level
== 6) odata
--; /* number of data disks */
1664 ndata
= info
->array
.raid_disks
- 1;
1665 if (info
->new_level
== 6) ndata
--;
1667 while (nstripe
>= ostripe
) {
1668 nstripe
+= info
->new_chunk
/ 512;
1669 last_block
= nstripe
* ndata
;
1670 ostripe
= last_block
/ odata
/ (info
->array
.chunk_size
/512) *
1671 (info
->array
.chunk_size
/512);
1674 if (info
->reshape_progress
>= last_block
)
1676 /* needed to recover critical section! */