2 * mdadm - manage Linux "md" devices aka RAID arrays.
4 * Copyright (C) 2001-2013 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>
31 #if ! defined(__BIG_ENDIAN) && ! defined(__LITTLE_ENDIAN)
32 #error no endian defined
37 int restore_backup(struct supertype
*st
,
38 struct mdinfo
*content
,
48 int disk_count
= next_spare
+ working_disks
;
49 char *backup_file
= *backup_filep
;
51 dprintf("Called restore_backup()\n");
52 fdlist
= xmalloc(sizeof(int) * disk_count
);
54 enable_fds(next_spare
);
55 for (i
= 0; i
< next_spare
; i
++)
57 for (dev
= content
->devs
; dev
; dev
= dev
->next
) {
61 sprintf(buf
, "%d:%d", dev
->disk
.major
, dev
->disk
.minor
);
62 fd
= dev_open(buf
, O_RDWR
);
64 if (dev
->disk
.raid_disk
>= 0)
65 fdlist
[dev
->disk
.raid_disk
] = fd
;
67 fdlist
[next_spare
++] = fd
;
71 backup_file
= locate_backup(content
->sys_name
);
72 *backup_filep
= backup_file
;
75 if (st
->ss
->external
&& st
->ss
->recover_backup
)
76 err
= st
->ss
->recover_backup(st
, content
);
78 err
= Grow_restart(st
, content
, fdlist
, next_spare
,
79 backup_file
, verbose
> 0);
81 while (next_spare
> 0) {
83 if (fdlist
[next_spare
] >= 0)
84 close(fdlist
[next_spare
]);
88 pr_err("Failed to restore critical section for reshape - sorry.\n");
90 pr_err("Possibly you need to specify a --backup-file\n");
94 dprintf("restore_backup() returns status OK.\n");
98 int Grow_Add_device(char *devname
, int fd
, char *newdev
)
100 /* Add a device to an active array.
101 * Currently, just extend a linear array.
102 * This requires writing a new superblock on the
103 * new device, calling the kernel to add the device,
104 * and if that succeeds, update the superblock on
106 * This means that we need to *find* all other devices.
113 struct supertype
*st
= NULL
;
114 char *subarray
= NULL
;
116 if (md_get_array_info(fd
, &info
.array
) < 0) {
117 pr_err("cannot get array info for %s\n", devname
);
121 if (info
.array
.level
!= -1) {
122 pr_err("can only add devices to linear arrays\n");
126 st
= super_by_fd(fd
, &subarray
);
128 pr_err("cannot handle arrays with superblock version %d\n",
129 info
.array
.major_version
);
134 pr_err("Cannot grow linear sub-arrays yet\n");
140 nfd
= open(newdev
, O_RDWR
|O_EXCL
|O_DIRECT
);
142 pr_err("cannot open %s\n", newdev
);
146 if (!fstat_is_blkdev(nfd
, newdev
, &rdev
)) {
151 /* now check out all the devices and make sure we can read the
153 for (d
=0 ; d
< info
.array
.raid_disks
; d
++) {
154 mdu_disk_info_t disk
;
157 st
->ss
->free_super(st
);
160 if (md_get_disk_info(fd
, &disk
) < 0) {
161 pr_err("cannot get device detail for device %d\n", d
);
166 dv
= map_dev(disk
.major
, disk
.minor
, 1);
168 pr_err("cannot find device file for device %d\n", d
);
173 fd2
= dev_open(dv
, O_RDWR
);
175 pr_err("cannot open device file %s\n", dv
);
181 if (st
->ss
->load_super(st
, fd2
, NULL
)) {
182 pr_err("cannot find super block on %s\n", dv
);
190 /* Ok, looks good. Lets update the superblock and write it out to
194 info
.disk
.number
= d
;
195 info
.disk
.major
= major(rdev
);
196 info
.disk
.minor
= minor(rdev
);
197 info
.disk
.raid_disk
= d
;
198 info
.disk
.state
= (1 << MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
);
199 if (st
->ss
->update_super(st
, &info
, "linear-grow-new", newdev
,
201 pr_err("Preparing new metadata failed on %s\n", newdev
);
206 if (st
->ss
->store_super(st
, nfd
)) {
207 pr_err("Cannot store new superblock on %s\n", newdev
);
213 if (ioctl(fd
, ADD_NEW_DISK
, &info
.disk
) != 0) {
214 pr_err("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 (md_get_array_info(fd
, &info
.array
) < 0) {
222 pr_err("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 (md_get_disk_info(fd
, &disk
) < 0) {
233 pr_err("cannot get device detail for device %d\n", d
);
236 dv
= map_dev(disk
.major
, disk
.minor
, 1);
238 pr_err("cannot find device file for device %d\n", d
);
241 fd2
= dev_open(dv
, O_RDWR
);
243 pr_err("cannot open device file %s\n", dv
);
246 if (st
->ss
->load_super(st
, fd2
, NULL
)) {
247 pr_err("cannot find super block on %s\n", dv
);
252 info
.array
.raid_disks
= nd
+1;
253 info
.array
.nr_disks
= nd
+1;
254 info
.array
.active_disks
= nd
+1;
255 info
.array
.working_disks
= nd
+1;
257 if (st
->ss
->update_super(st
, &info
, "linear-grow-update", dv
,
259 pr_err("Updating metadata failed on %s\n", dv
);
264 if (st
->ss
->store_super(st
, fd2
)) {
265 pr_err("Cannot store new superblock on %s\n", dv
);
275 int Grow_addbitmap(char *devname
, int fd
, struct context
*c
, struct shape
*s
)
278 * First check that array doesn't have a bitmap
279 * Then create the bitmap
282 * For internal bitmaps, we need to check the version,
283 * find all the active devices, and write the bitmap block
286 mdu_bitmap_file_t bmf
;
287 mdu_array_info_t array
;
288 struct supertype
*st
;
289 char *subarray
= NULL
;
290 int major
= BITMAP_MAJOR_HI
;
291 unsigned long long bitmapsize
, array_size
;
295 * We only ever get called if s->bitmap_file is != NULL, so this check
296 * is just here to quiet down static code checkers.
301 if (strcmp(s
->bitmap_file
, "clustered") == 0)
302 major
= BITMAP_MAJOR_CLUSTERED
;
304 if (ioctl(fd
, GET_BITMAP_FILE
, &bmf
) != 0) {
306 pr_err("Memory allocation failure.\n");
308 pr_err("bitmaps not supported by this kernel.\n");
311 if (bmf
.pathname
[0]) {
312 if (strcmp(s
->bitmap_file
,"none") == 0) {
313 if (ioctl(fd
, SET_BITMAP_FILE
, -1) != 0) {
314 pr_err("failed to remove bitmap %s\n",
320 pr_err("%s already has a bitmap (%s)\n", devname
, bmf
.pathname
);
323 if (md_get_array_info(fd
, &array
) != 0) {
324 pr_err("cannot get array status for %s\n", devname
);
327 if (array
.state
& (1 << MD_SB_BITMAP_PRESENT
)) {
328 if (strcmp(s
->bitmap_file
, "none")==0) {
329 array
.state
&= ~(1 << MD_SB_BITMAP_PRESENT
);
330 if (md_set_array_info(fd
, &array
) != 0) {
331 if (array
.state
& (1 << MD_SB_CLUSTERED
))
332 pr_err("failed to remove clustered bitmap.\n");
334 pr_err("failed to remove internal bitmap.\n");
339 pr_err("bitmap already present on %s\n", devname
);
343 if (strcmp(s
->bitmap_file
, "none") == 0) {
344 pr_err("no bitmap found on %s\n", devname
);
347 if (array
.level
<= 0) {
348 pr_err("Bitmaps not meaningful with level %s\n",
349 map_num(pers
, array
.level
)?:"of this array");
352 bitmapsize
= array
.size
;
354 if (get_dev_size(fd
, NULL
, &array_size
) &&
355 array_size
> (0x7fffffffULL
<< 9)) {
356 /* Array is big enough that we cannot trust array.size
357 * try other approaches
359 bitmapsize
= get_component_size(fd
);
361 if (bitmapsize
== 0) {
362 pr_err("Cannot reliably determine size of array to create bitmap - sorry.\n");
366 if (array
.level
== 10) {
369 ncopies
= (array
.layout
& 255) * ((array
.layout
>> 8) & 255);
370 bitmapsize
= bitmapsize
* array
.raid_disks
/ ncopies
;
372 if (strcmp(s
->bitmap_file
, "clustered") == 0 &&
373 !is_near_layout_10(array
.layout
)) {
374 pr_err("only near layout is supported with clustered raid10\n");
379 st
= super_by_fd(fd
, &subarray
);
381 pr_err("Cannot understand version %d.%d\n",
382 array
.major_version
, array
.minor_version
);
386 pr_err("Cannot add bitmaps to sub-arrays yet\n");
392 mdi
= sysfs_read(fd
, NULL
, GET_CONSISTENCY_POLICY
);
394 if (mdi
->consistency_policy
== CONSISTENCY_POLICY_PPL
) {
395 pr_err("Cannot add bitmap to array with PPL\n");
403 if (strcmp(s
->bitmap_file
, "internal") == 0 ||
404 strcmp(s
->bitmap_file
, "clustered") == 0) {
407 int offset_setable
= 0;
408 if (st
->ss
->add_internal_bitmap
== NULL
) {
409 pr_err("Internal bitmaps not supported with %s metadata\n", st
->ss
->name
);
412 st
->nodes
= c
->nodes
;
413 st
->cluster_name
= c
->homecluster
;
414 mdi
= sysfs_read(fd
, NULL
, GET_BITMAP_LOCATION
);
417 for (d
= 0; d
< st
->max_devs
; d
++) {
418 mdu_disk_info_t disk
;
423 if (md_get_disk_info(fd
, &disk
) < 0)
425 if (disk
.major
== 0 && disk
.minor
== 0)
427 if ((disk
.state
& (1 << MD_DISK_SYNC
)) == 0)
429 dv
= map_dev(disk
.major
, disk
.minor
, 1);
432 if (((disk
.state
& (1 << MD_DISK_WRITEMOSTLY
)) == 0) &&
433 (strcmp(s
->bitmap_file
, "clustered") == 0)) {
434 pr_err("%s disks marked write-mostly are not supported with clustered bitmap\n",devname
);
437 fd2
= dev_open(dv
, O_RDWR
);
440 rv
= st
->ss
->load_super(st
, fd2
, NULL
);
442 rv
= st
->ss
->add_internal_bitmap(
443 st
, &s
->bitmap_chunk
, c
->delay
,
444 s
->write_behind
, bitmapsize
,
445 offset_setable
, major
);
447 st
->ss
->write_bitmap(st
, fd2
,
450 pr_err("failed to create internal bitmap - chunksize problem.\n");
453 pr_err("failed to load super-block.\n");
459 if (offset_setable
) {
460 st
->ss
->getinfo_super(st
, mdi
, NULL
);
461 if (sysfs_init(mdi
, fd
, NULL
)) {
462 pr_err("failed to initialize sysfs.\n");
465 rv
= sysfs_set_num_signed(mdi
, NULL
, "bitmap/location",
469 if (strcmp(s
->bitmap_file
, "clustered") == 0)
470 array
.state
|= (1 << MD_SB_CLUSTERED
);
471 array
.state
|= (1 << MD_SB_BITMAP_PRESENT
);
472 rv
= md_set_array_info(fd
, &array
);
476 pr_err("Cannot add bitmap while array is resyncing or reshaping etc.\n");
477 pr_err("failed to set internal bitmap.\n");
484 int max_devs
= st
->max_devs
;
486 /* try to load a superblock */
487 for (d
= 0; d
< max_devs
; d
++) {
488 mdu_disk_info_t disk
;
492 if (md_get_disk_info(fd
, &disk
) < 0)
494 if ((disk
.major
==0 && disk
.minor
== 0) ||
495 (disk
.state
& (1 << MD_DISK_REMOVED
)))
497 dv
= map_dev(disk
.major
, disk
.minor
, 1);
500 fd2
= dev_open(dv
, O_RDONLY
);
502 if (st
->ss
->load_super(st
, fd2
, NULL
) == 0) {
504 st
->ss
->uuid_from_super(st
, uuid
);
511 pr_err("cannot find UUID for array!\n");
514 if (CreateBitmap(s
->bitmap_file
, c
->force
, (char*)uuid
,
515 s
->bitmap_chunk
, c
->delay
, s
->write_behind
,
516 bitmapsize
, major
)) {
519 bitmap_fd
= open(s
->bitmap_file
, O_RDWR
);
521 pr_err("weird: %s cannot be opened\n", s
->bitmap_file
);
524 if (ioctl(fd
, SET_BITMAP_FILE
, bitmap_fd
) < 0) {
527 pr_err("Cannot add bitmap while array is resyncing or reshaping etc.\n");
528 pr_err("Cannot set bitmap file for %s: %s\n",
529 devname
, strerror(err
));
537 int Grow_consistency_policy(char *devname
, int fd
, struct context
*c
, struct shape
*s
)
539 struct supertype
*st
;
542 char *subarray
= NULL
;
544 char container_dev
[PATH_MAX
];
547 if (s
->consistency_policy
!= CONSISTENCY_POLICY_RESYNC
&&
548 s
->consistency_policy
!= CONSISTENCY_POLICY_PPL
) {
549 pr_err("Operation not supported for consistency policy %s\n",
550 map_num(consistency_policies
, s
->consistency_policy
));
554 st
= super_by_fd(fd
, &subarray
);
558 sra
= sysfs_read(fd
, NULL
, GET_CONSISTENCY_POLICY
|GET_LEVEL
|
565 if (s
->consistency_policy
== CONSISTENCY_POLICY_PPL
&&
566 !st
->ss
->write_init_ppl
) {
567 pr_err("%s metadata does not support PPL\n", st
->ss
->name
);
572 if (sra
->array
.level
!= 5) {
573 pr_err("Operation not supported for array level %d\n",
579 if (sra
->consistency_policy
== (unsigned)s
->consistency_policy
) {
580 pr_err("Consistency policy is already %s\n",
581 map_num(consistency_policies
, s
->consistency_policy
));
584 } else if (sra
->consistency_policy
!= CONSISTENCY_POLICY_RESYNC
&&
585 sra
->consistency_policy
!= CONSISTENCY_POLICY_PPL
) {
586 pr_err("Current consistency policy is %s, cannot change to %s\n",
587 map_num(consistency_policies
, sra
->consistency_policy
),
588 map_num(consistency_policies
, s
->consistency_policy
));
593 if (s
->consistency_policy
== CONSISTENCY_POLICY_PPL
) {
594 if (sysfs_get_str(sra
, NULL
, "sync_action", buf
, 20) <= 0) {
597 } else if (strcmp(buf
, "reshape\n") == 0) {
598 pr_err("PPL cannot be enabled when reshape is in progress\n");
607 if (s
->consistency_policy
== CONSISTENCY_POLICY_PPL
)
612 sprintf(container_dev
, "/dev/%s", st
->container_devnm
);
614 ret
= Update_subarray(container_dev
, subarray
, update
, NULL
,
620 if (s
->consistency_policy
== CONSISTENCY_POLICY_PPL
) {
627 cfd
= open(container_dev
, O_RDWR
|O_EXCL
);
629 pr_err("Failed to open %s\n", container_dev
);
634 ret
= st
->ss
->load_container(st
, cfd
, st
->container_devnm
);
638 pr_err("Cannot read superblock for %s\n",
643 mdi
= st
->ss
->container_content(st
, subarray
);
648 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
652 devpath
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 0);
653 dfd
= dev_open(devpath
, O_RDWR
);
655 pr_err("Failed to open %s\n", devpath
);
661 ret
= st
->ss
->load_super(st
, dfd
, NULL
);
663 pr_err("Failed to load super-block.\n");
668 ret
= st
->ss
->update_super(st
, sra
, "ppl",
670 c
->verbose
, 0, NULL
);
673 st
->ss
->free_super(st
);
676 st
->ss
->getinfo_super(st
, &info
, NULL
);
679 ret
|= sysfs_set_num(sra
, sd
, "ppl_sector",
681 ret
|= sysfs_set_num(sra
, sd
, "ppl_size",
685 pr_err("Failed to set PPL attributes for %s\n",
688 st
->ss
->free_super(st
);
692 ret
= st
->ss
->write_init_ppl(st
, &info
, dfd
);
694 pr_err("Failed to write PPL\n");
699 st
->ss
->free_super(st
);
706 ret
= sysfs_set_str(sra
, NULL
, "consistency_policy",
707 map_num(consistency_policies
,
708 s
->consistency_policy
));
710 pr_err("Failed to change array consistency policy\n");
722 * When reshaping an array we might need to backup some data.
723 * This is written to all spares with a 'super_block' describing it.
724 * The superblock goes 4K from the end of the used space on the
726 * It if written after the backup is complete.
727 * It has the following structure.
730 static struct mdp_backup_super
{
731 char magic
[16]; /* md_backup_data-1 or -2 */
734 /* start/sizes in 512byte sectors */
735 __u64 devstart
; /* address on backup device/file of data */
738 __u32 sb_csum
; /* csum of preceeding bytes. */
740 __u64 devstart2
; /* offset in to data of second section */
743 __u32 sb_csum2
; /* csum of preceeding bytes. */
745 } __attribute__((aligned(512))) bsb
, bsb2
;
747 static __u32
bsb_csum(char *buf
, int len
)
751 for (i
= 0; i
< len
; i
++)
752 csum
= (csum
<<3) + buf
[0];
753 return __cpu_to_le32(csum
);
756 static int check_idle(struct supertype
*st
)
758 /* Check that all member arrays for this container, or the
759 * container of this array, are idle
761 char *container
= (st
->container_devnm
[0]
762 ? st
->container_devnm
: st
->devnm
);
763 struct mdstat_ent
*ent
, *e
;
766 ent
= mdstat_read(0, 0);
767 for (e
= ent
; e
; e
= e
->next
) {
768 if (!is_container_member(e
, container
))
770 /* frozen array is not idle*/
771 if (e
->percent
>= 0 || e
->metadata_version
[9] == '-') {
780 static int freeze_container(struct supertype
*st
)
782 char *container
= (st
->container_devnm
[0]
783 ? st
->container_devnm
: st
->devnm
);
788 if (block_monitor(container
, 1)) {
789 pr_err("failed to freeze container\n");
796 static void unfreeze_container(struct supertype
*st
)
798 char *container
= (st
->container_devnm
[0]
799 ? st
->container_devnm
: st
->devnm
);
801 unblock_monitor(container
, 1);
804 static int freeze(struct supertype
*st
)
806 /* Try to freeze resync/rebuild on this array/container.
807 * Return -1 if the array is busy,
808 * return -2 container cannot be frozen,
809 * return 0 if this kernel doesn't support 'frozen'
810 * return 1 if it worked.
812 if (st
->ss
->external
)
813 return freeze_container(st
);
815 struct mdinfo
*sra
= sysfs_read(-1, st
->devnm
, GET_VERSION
);
821 /* Need to clear any 'read-auto' status */
822 if (sysfs_get_str(sra
, NULL
, "array_state", buf
, 20) > 0 &&
823 strncmp(buf
, "read-auto", 9) == 0)
824 sysfs_set_str(sra
, NULL
, "array_state", "clean");
826 err
= sysfs_freeze_array(sra
);
832 static void unfreeze(struct supertype
*st
)
834 if (st
->ss
->external
)
835 return unfreeze_container(st
);
837 struct mdinfo
*sra
= sysfs_read(-1, st
->devnm
, GET_VERSION
);
841 sysfs_get_str(sra
, NULL
, "sync_action", buf
, 20) > 0 &&
842 strcmp(buf
, "frozen\n") == 0)
843 sysfs_set_str(sra
, NULL
, "sync_action", "idle");
848 static void wait_reshape(struct mdinfo
*sra
)
850 int fd
= sysfs_get_fd(sra
, NULL
, "sync_action");
856 while (sysfs_fd_get_str(fd
, action
, 20) > 0 &&
857 strncmp(action
, "reshape", 7) == 0)
858 sysfs_wait(fd
, NULL
);
862 static int reshape_super(struct supertype
*st
, unsigned long long size
,
863 int level
, int layout
, int chunksize
, int raid_disks
,
864 int delta_disks
, char *backup_file
, char *dev
,
865 int direction
, int verbose
)
867 /* nothing extra to check in the native case */
868 if (!st
->ss
->external
)
870 if (!st
->ss
->reshape_super
|| !st
->ss
->manage_reshape
) {
871 pr_err("%s metadata does not support reshape\n",
876 return st
->ss
->reshape_super(st
, size
, level
, layout
, chunksize
,
877 raid_disks
, delta_disks
, backup_file
, dev
,
881 static void sync_metadata(struct supertype
*st
)
883 if (st
->ss
->external
) {
884 if (st
->update_tail
) {
885 flush_metadata_updates(st
);
886 st
->update_tail
= &st
->updates
;
888 st
->ss
->sync_metadata(st
);
892 static int subarray_set_num(char *container
, struct mdinfo
*sra
, char *name
, int n
)
894 /* when dealing with external metadata subarrays we need to be
895 * prepared to handle EAGAIN. The kernel may need to wait for
896 * mdmon to mark the array active so the kernel can handle
897 * allocations/writeback when preparing the reshape action
898 * (md_allow_write()). We temporarily disable safe_mode_delay
899 * to close a race with the array_state going clean before the
900 * next write to raid_disks / stripe_cache_size
905 /* only 'raid_disks' and 'stripe_cache_size' trigger md_allow_write */
907 (strcmp(name
, "raid_disks") != 0 &&
908 strcmp(name
, "stripe_cache_size") != 0))
909 return sysfs_set_num(sra
, NULL
, name
, n
);
911 rc
= sysfs_get_str(sra
, NULL
, "safe_mode_delay", safe
, sizeof(safe
));
914 sysfs_set_num(sra
, NULL
, "safe_mode_delay", 0);
915 rc
= sysfs_set_num(sra
, NULL
, name
, n
);
916 if (rc
< 0 && errno
== EAGAIN
) {
917 ping_monitor(container
);
918 /* if we get EAGAIN here then the monitor is not active
921 rc
= sysfs_set_num(sra
, NULL
, name
, n
);
923 sysfs_set_str(sra
, NULL
, "safe_mode_delay", safe
);
927 int start_reshape(struct mdinfo
*sra
, int already_running
,
928 int before_data_disks
, int data_disks
, struct supertype
*st
)
931 unsigned long long sync_max_to_set
;
933 sysfs_set_num(sra
, NULL
, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL
);
934 err
= sysfs_set_num(sra
, NULL
, "suspend_hi", sra
->reshape_progress
);
935 err
= err
?: sysfs_set_num(sra
, NULL
, "suspend_lo",
936 sra
->reshape_progress
);
937 if (before_data_disks
<= data_disks
)
938 sync_max_to_set
= sra
->reshape_progress
/ data_disks
;
940 sync_max_to_set
= (sra
->component_size
* data_disks
941 - sra
->reshape_progress
) / data_disks
;
943 if (!already_running
)
944 sysfs_set_num(sra
, NULL
, "sync_min", sync_max_to_set
);
946 if (st
->ss
->external
)
947 err
= err
?: sysfs_set_num(sra
, NULL
, "sync_max", sync_max_to_set
);
949 err
= err
?: sysfs_set_str(sra
, NULL
, "sync_max", "max");
951 if (!already_running
&& err
== 0) {
954 err
= sysfs_set_str(sra
, NULL
, "sync_action",
958 } while (err
&& errno
== EBUSY
&& cnt
-- > 0);
963 void abort_reshape(struct mdinfo
*sra
)
965 sysfs_set_str(sra
, NULL
, "sync_action", "idle");
967 * Prior to kernel commit: 23ddff3792f6 ("md: allow suspend_lo and
968 * suspend_hi to decrease as well as increase.")
969 * you could only increase suspend_{lo,hi} unless the region they
970 * covered was empty. So to reset to 0, you need to push suspend_lo
971 * up past suspend_hi first. So to maximize the chance of mdadm
972 * working on all kernels, we want to keep doing that.
974 sysfs_set_num(sra
, NULL
, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL
);
975 sysfs_set_num(sra
, NULL
, "suspend_hi", 0);
976 sysfs_set_num(sra
, NULL
, "suspend_lo", 0);
977 sysfs_set_num(sra
, NULL
, "sync_min", 0);
978 // It isn't safe to reset sync_max as we aren't monitoring.
979 // Array really should be stopped at this point.
982 int remove_disks_for_takeover(struct supertype
*st
,
987 struct mdinfo
*remaining
;
990 if (st
->ss
->external
) {
992 struct mdinfo
*arrays
= st
->ss
->container_content(st
, NULL
);
994 * containter_content returns list of arrays in container
995 * If arrays->next is not NULL it means that there are
996 * 2 arrays in container and operation should be blocked
1003 pr_err("Error. Cannot perform operation on %s- for this operation "
1004 "it MUST be single array in container\n", st
->devnm
);
1010 if (sra
->array
.level
== 10)
1011 nr_of_copies
= layout
& 0xff;
1012 else if (sra
->array
.level
== 1)
1013 nr_of_copies
= sra
->array
.raid_disks
;
1017 remaining
= sra
->devs
;
1019 /* for each 'copy', select one device and remove from the list. */
1020 for (slot
= 0; slot
< sra
->array
.raid_disks
; slot
+= nr_of_copies
) {
1021 struct mdinfo
**diskp
;
1024 /* Find a working device to keep */
1025 for (diskp
= &remaining
; *diskp
; diskp
= &(*diskp
)->next
) {
1026 struct mdinfo
*disk
= *diskp
;
1028 if (disk
->disk
.raid_disk
< slot
)
1030 if (disk
->disk
.raid_disk
>= slot
+ nr_of_copies
)
1032 if (disk
->disk
.state
& (1<<MD_DISK_REMOVED
))
1034 if (disk
->disk
.state
& (1<<MD_DISK_FAULTY
))
1036 if (!(disk
->disk
.state
& (1<<MD_DISK_SYNC
)))
1039 /* We have found a good disk to use! */
1040 *diskp
= disk
->next
;
1041 disk
->next
= sra
->devs
;
1050 if (slot
< sra
->array
.raid_disks
) {
1051 /* didn't find all slots */
1057 sra
->devs
= remaining
;
1061 /* Remove all 'remaining' devices from the array */
1063 struct mdinfo
*sd
= remaining
;
1064 remaining
= sd
->next
;
1066 sysfs_set_str(sra
, sd
, "state", "faulty");
1067 sysfs_set_str(sra
, sd
, "slot", "none");
1068 /* for external metadata disks should be removed in mdmon */
1069 if (!st
->ss
->external
)
1070 sysfs_set_str(sra
, sd
, "state", "remove");
1071 sd
->disk
.state
|= (1<<MD_DISK_REMOVED
);
1072 sd
->disk
.state
&= ~(1<<MD_DISK_SYNC
);
1073 sd
->next
= sra
->devs
;
1079 void reshape_free_fdlist(int *fdlist
,
1080 unsigned long long *offsets
,
1085 for (i
= 0; i
< size
; i
++)
1093 int reshape_prepare_fdlist(char *devname
,
1097 unsigned long blocks
,
1100 unsigned long long *offsets
)
1105 enable_fds(nrdisks
);
1106 for (d
= 0; d
<= nrdisks
; d
++)
1109 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
1110 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
1112 if (sd
->disk
.state
& (1<<MD_DISK_SYNC
) &&
1113 sd
->disk
.raid_disk
< raid_disks
) {
1114 char *dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 1);
1115 fdlist
[sd
->disk
.raid_disk
] = dev_open(dn
, O_RDONLY
);
1116 offsets
[sd
->disk
.raid_disk
] = sd
->data_offset
*512;
1117 if (fdlist
[sd
->disk
.raid_disk
] < 0) {
1118 pr_err("%s: cannot open component %s\n",
1119 devname
, dn
? dn
: "-unknown-");
1123 } else if (backup_file
== NULL
) {
1125 char *dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 1);
1126 fdlist
[d
] = dev_open(dn
, O_RDWR
);
1127 offsets
[d
] = (sd
->data_offset
+ sra
->component_size
- blocks
- 8)*512;
1128 if (fdlist
[d
] < 0) {
1129 pr_err("%s: cannot open component %s\n",
1130 devname
, dn
? dn
: "-unknown-");
1141 int reshape_open_backup_file(char *backup_file
,
1146 unsigned long long *offsets
,
1150 /* Return 1 on success, 0 on any form of failure */
1151 /* need to check backup file is large enough */
1157 *fdlist
= open(backup_file
, O_RDWR
|O_CREAT
|(restart
? O_TRUNC
: O_EXCL
),
1161 pr_err("%s: cannot create backup file %s: %s\n",
1162 devname
, backup_file
, strerror(errno
));
1165 /* Guard against backup file being on array device.
1166 * If array is partitioned or if LVM etc is in the
1167 * way this will not notice, but it is better than
1170 fstat(*fdlist
, &stb
);
1173 if (stb
.st_rdev
== dev
) {
1174 pr_err("backup file must NOT be on the array being reshaped.\n");
1179 memset(buf
, 0, 512);
1180 for (i
=0; i
< blocks
+ 8 ; i
++) {
1181 if (write(*fdlist
, buf
, 512) != 512) {
1182 pr_err("%s: cannot create backup file %s: %s\n",
1183 devname
, backup_file
, strerror(errno
));
1187 if (fsync(*fdlist
) != 0) {
1188 pr_err("%s: cannot create backup file %s: %s\n",
1189 devname
, backup_file
, strerror(errno
));
1193 if (!restart
&& strncmp(backup_file
, MAP_DIR
, strlen(MAP_DIR
)) != 0) {
1194 char *bu
= make_backup(sys_name
);
1195 if (symlink(backup_file
, bu
))
1196 pr_err("Recording backup file in " MAP_DIR
" failed: %s\n",
1204 unsigned long compute_backup_blocks(int nchunk
, int ochunk
,
1205 unsigned int ndata
, unsigned int odata
)
1207 unsigned long a
, b
, blocks
;
1208 /* So how much do we need to backup.
1209 * We need an amount of data which is both a whole number of
1210 * old stripes and a whole number of new stripes.
1211 * So LCM for (chunksize*datadisks).
1213 a
= (ochunk
/512) * odata
;
1214 b
= (nchunk
/512) * ndata
;
1217 /* LCM == product / GCD */
1218 blocks
= (unsigned long)(ochunk
/512) * (unsigned long)(nchunk
/512) *
1224 char *analyse_change(char *devname
, struct mdinfo
*info
, struct reshape
*re
)
1226 /* Based on the current array state in info->array and
1227 * the changes in info->new_* etc, determine:
1228 * - whether the change is possible
1229 * - Intermediate level/raid_disks/layout
1230 * - whether a restriping reshape is needed
1231 * - number of sectors in minimum change unit. This
1232 * will cover a whole number of stripes in 'before' and
1235 * Return message if the change should be rejected
1236 * NULL if the change can be achieved
1238 * This can be called as part of starting a reshape, or
1239 * when assembling an array that is undergoing reshape.
1241 int near
, far
, offset
, copies
;
1243 int old_chunk
, new_chunk
;
1244 /* delta_parity records change in number of devices
1245 * caused by level change
1247 int delta_parity
= 0;
1249 memset(re
, 0, sizeof(*re
));
1251 /* If a new level not explicitly given, we assume no-change */
1252 if (info
->new_level
== UnSet
)
1253 info
->new_level
= info
->array
.level
;
1255 if (info
->new_chunk
)
1256 switch (info
->new_level
) {
1262 /* chunk size is meaningful, must divide component_size
1265 if (info
->component_size
% (info
->new_chunk
/512)) {
1266 unsigned long long shrink
= info
->component_size
;
1267 shrink
&= ~(unsigned long long)(info
->new_chunk
/512-1);
1268 pr_err("New chunk size (%dK) does not evenly divide device size (%lluk)\n",
1269 info
->new_chunk
/1024, info
->component_size
/2);
1270 pr_err("After shrinking any filesystem, \"mdadm --grow %s --size %llu\"\n",
1272 pr_err("will shrink the array so the given chunk size would work.\n");
1277 return "chunk size not meaningful for this level";
1280 info
->new_chunk
= info
->array
.chunk_size
;
1282 switch (info
->array
.level
) {
1284 return "No reshape is possibly for this RAID level";
1286 if (info
->delta_disks
!= UnSet
)
1287 return "Only --add is supported for LINEAR, setting --raid-disks is not needed";
1289 return "Only --add is supported for LINEAR, other --grow options are not meaningful";
1291 /* RAID1 can convert to RAID1 with different disks, or
1292 * raid5 with 2 disks, or
1295 if (info
->new_level
> 1 && (info
->component_size
& 7))
1296 return "Cannot convert RAID1 of this size - reduce size to multiple of 4K first.";
1297 if (info
->new_level
== 0) {
1298 if (info
->delta_disks
!= UnSet
&&
1299 info
->delta_disks
!= 0)
1300 return "Cannot change number of disks with RAID1->RAID0 conversion";
1302 re
->before
.data_disks
= 1;
1303 re
->after
.data_disks
= 1;
1306 if (info
->new_level
== 1) {
1307 if (info
->delta_disks
== UnSet
)
1308 /* Don't know what to do */
1309 return "no change requested for Growing RAID1";
1313 if (info
->array
.raid_disks
!= 2 && info
->new_level
== 5)
1314 return "Can only convert a 2-device array to RAID5";
1315 if (info
->array
.raid_disks
== 2 && info
->new_level
== 5) {
1317 re
->before
.data_disks
= 1;
1318 if (info
->delta_disks
!= UnSet
&&
1319 info
->delta_disks
!= 0)
1320 re
->after
.data_disks
= 1 + info
->delta_disks
;
1322 re
->after
.data_disks
= 1;
1323 if (re
->after
.data_disks
< 1)
1324 return "Number of disks too small for RAID5";
1326 re
->before
.layout
= ALGORITHM_LEFT_SYMMETRIC
;
1327 info
->array
.chunk_size
= 65536;
1330 /* Could do some multi-stage conversions, but leave that to
1333 return "Impossibly level change request for RAID1";
1336 /* RAID10 can be converted from near mode to
1337 * RAID0 by removing some devices.
1338 * It can also be reshaped if the kernel supports
1341 switch (info
->new_level
) {
1343 if ((info
->array
.layout
& ~0xff) != 0x100)
1344 return "Cannot Grow RAID10 with far/offset layout";
1346 * number of devices must be multiple of
1349 if (info
->array
.raid_disks
%
1350 (info
->array
.layout
& 0xff))
1351 return "RAID10 layout too complex for Grow operation";
1353 new_disks
= (info
->array
.raid_disks
/
1354 (info
->array
.layout
& 0xff));
1355 if (info
->delta_disks
== UnSet
)
1356 info
->delta_disks
= (new_disks
1357 - info
->array
.raid_disks
);
1359 if (info
->delta_disks
!=
1360 new_disks
- info
->array
.raid_disks
)
1361 return "New number of raid-devices impossible for RAID10";
1362 if (info
->new_chunk
&&
1363 info
->new_chunk
!= info
->array
.chunk_size
)
1364 return "Cannot change chunk-size with RAID10 Grow";
1368 re
->before
.data_disks
= new_disks
;
1369 re
->after
.data_disks
= re
->before
.data_disks
;
1373 near
= info
->array
.layout
& 0xff;
1374 far
= (info
->array
.layout
>> 8) & 0xff;
1375 offset
= info
->array
.layout
& 0x10000;
1376 if (far
> 1 && !offset
)
1377 return "Cannot reshape RAID10 in far-mode";
1378 copies
= near
* far
;
1380 old_chunk
= info
->array
.chunk_size
* far
;
1382 if (info
->new_layout
== UnSet
)
1383 info
->new_layout
= info
->array
.layout
;
1385 near
= info
->new_layout
& 0xff;
1386 far
= (info
->new_layout
>> 8) & 0xff;
1387 offset
= info
->new_layout
& 0x10000;
1388 if (far
> 1 && !offset
)
1389 return "Cannot reshape RAID10 to far-mode";
1390 if (near
* far
!= copies
)
1391 return "Cannot change number of copies when reshaping RAID10";
1393 if (info
->delta_disks
== UnSet
)
1394 info
->delta_disks
= 0;
1395 new_disks
= (info
->array
.raid_disks
+
1398 new_chunk
= info
->new_chunk
* far
;
1401 re
->before
.layout
= info
->array
.layout
;
1402 re
->before
.data_disks
= info
->array
.raid_disks
;
1403 re
->after
.layout
= info
->new_layout
;
1404 re
->after
.data_disks
= new_disks
;
1405 /* For RAID10 we don't do backup but do allow reshape,
1406 * so set backup_blocks to INVALID_SECTORS rather than
1408 * And there is no need to synchronise stripes on both
1409 * 'old' and 'new'. So the important
1410 * number is the minimum data_offset difference
1411 * which is the larger of (offset copies * chunk).
1413 re
->backup_blocks
= INVALID_SECTORS
;
1414 re
->min_offset_change
= max(old_chunk
, new_chunk
) / 512;
1415 if (new_disks
< re
->before
.data_disks
&&
1416 info
->space_after
< re
->min_offset_change
)
1417 /* Reduce component size by one chunk */
1418 re
->new_size
= (info
->component_size
-
1419 re
->min_offset_change
);
1421 re
->new_size
= info
->component_size
;
1422 re
->new_size
= re
->new_size
* new_disks
/ copies
;
1426 return "RAID10 can only be changed to RAID0";
1429 /* RAID0 can be converted to RAID10, or to RAID456 */
1430 if (info
->new_level
== 10) {
1431 if (info
->new_layout
== UnSet
&&
1432 info
->delta_disks
== UnSet
) {
1433 /* Assume near=2 layout */
1434 info
->new_layout
= 0x102;
1435 info
->delta_disks
= info
->array
.raid_disks
;
1437 if (info
->new_layout
== UnSet
) {
1438 int copies
= 1 + (info
->delta_disks
1439 / info
->array
.raid_disks
);
1440 if (info
->array
.raid_disks
* (copies
-1) !=
1442 return "Impossible number of devices for RAID0->RAID10";
1443 info
->new_layout
= 0x100 + copies
;
1445 if (info
->delta_disks
== UnSet
) {
1446 int copies
= info
->new_layout
& 0xff;
1447 if (info
->new_layout
!= 0x100 + copies
)
1448 return "New layout impossible for RAID0->RAID10";;
1449 info
->delta_disks
= (copies
- 1) *
1450 info
->array
.raid_disks
;
1452 if (info
->new_chunk
&&
1453 info
->new_chunk
!= info
->array
.chunk_size
)
1454 return "Cannot change chunk-size with RAID0->RAID10";
1457 re
->before
.data_disks
= (info
->array
.raid_disks
+
1459 re
->after
.data_disks
= re
->before
.data_disks
;
1460 re
->before
.layout
= info
->new_layout
;
1464 /* RAID0 can also covert to RAID0/4/5/6 by first converting to
1465 * a raid4 style layout of the final level.
1467 switch (info
->new_level
) {
1472 re
->before
.layout
= 0;
1477 re
->before
.layout
= ALGORITHM_PARITY_N
;
1478 if (info
->new_layout
== UnSet
)
1479 info
->new_layout
= map_name(r5layout
, "default");
1484 re
->before
.layout
= ALGORITHM_PARITY_N
;
1485 if (info
->new_layout
== UnSet
)
1486 info
->new_layout
= map_name(r6layout
, "default");
1489 return "Impossible level change requested";
1491 re
->before
.data_disks
= info
->array
.raid_disks
;
1492 /* determining 'after' layout happens outside this 'switch' */
1496 info
->array
.layout
= ALGORITHM_PARITY_N
;
1498 switch (info
->new_level
) {
1502 re
->level
= info
->array
.level
;
1503 re
->before
.data_disks
= info
->array
.raid_disks
- 1;
1504 re
->before
.layout
= info
->array
.layout
;
1508 re
->before
.data_disks
= info
->array
.raid_disks
- 1;
1509 re
->before
.layout
= info
->array
.layout
;
1514 re
->before
.data_disks
= info
->array
.raid_disks
- 1;
1515 switch (info
->array
.layout
) {
1516 case ALGORITHM_LEFT_ASYMMETRIC
:
1517 re
->before
.layout
= ALGORITHM_LEFT_ASYMMETRIC_6
;
1519 case ALGORITHM_RIGHT_ASYMMETRIC
:
1520 re
->before
.layout
= ALGORITHM_RIGHT_ASYMMETRIC_6
;
1522 case ALGORITHM_LEFT_SYMMETRIC
:
1523 re
->before
.layout
= ALGORITHM_LEFT_SYMMETRIC_6
;
1525 case ALGORITHM_RIGHT_SYMMETRIC
:
1526 re
->before
.layout
= ALGORITHM_RIGHT_SYMMETRIC_6
;
1528 case ALGORITHM_PARITY_0
:
1529 re
->before
.layout
= ALGORITHM_PARITY_0_6
;
1531 case ALGORITHM_PARITY_N
:
1532 re
->before
.layout
= ALGORITHM_PARITY_N_6
;
1535 return "Cannot convert an array with this layout";
1539 if (info
->array
.raid_disks
!= 2)
1540 return "Can only convert a 2-device array to RAID1";
1541 if (info
->delta_disks
!= UnSet
&&
1542 info
->delta_disks
!= 0)
1543 return "Cannot set raid_disk when converting RAID5->RAID1";
1545 info
->new_chunk
= 0;
1548 return "Impossible level change requested";
1552 switch (info
->new_level
) {
1558 re
->before
.data_disks
= info
->array
.raid_disks
- 2;
1559 re
->before
.layout
= info
->array
.layout
;
1562 return "Impossible level change requested";
1567 /* If we reached here then it looks like a re-stripe is
1568 * happening. We have determined the intermediate level
1569 * and initial raid_disks/layout and stored these in 're'.
1571 * We need to deduce the final layout that can be atomically
1572 * converted to the end state.
1574 switch (info
->new_level
) {
1576 /* We can only get to RAID0 from RAID4 or RAID5
1577 * with appropriate layout and one extra device
1579 if (re
->level
!= 4 && re
->level
!= 5)
1580 return "Cannot covert to RAID0 from this level";
1582 switch (re
->level
) {
1584 re
->before
.layout
= 0;
1585 re
->after
.layout
= 0;
1588 re
->after
.layout
= ALGORITHM_PARITY_N
;
1594 /* We can only get to RAID4 from RAID5 */
1595 if (re
->level
!= 4 && re
->level
!= 5)
1596 return "Cannot convert to RAID4 from this level";
1598 switch (re
->level
) {
1600 re
->after
.layout
= 0;
1603 re
->after
.layout
= ALGORITHM_PARITY_N
;
1609 /* We get to RAID5 from RAID5 or RAID6 */
1610 if (re
->level
!= 5 && re
->level
!= 6)
1611 return "Cannot convert to RAID5 from this level";
1613 switch (re
->level
) {
1615 if (info
->new_layout
== UnSet
)
1616 re
->after
.layout
= re
->before
.layout
;
1618 re
->after
.layout
= info
->new_layout
;
1621 if (info
->new_layout
== UnSet
)
1622 info
->new_layout
= re
->before
.layout
;
1624 /* after.layout needs to be raid6 version of new_layout */
1625 if (info
->new_layout
== ALGORITHM_PARITY_N
)
1626 re
->after
.layout
= ALGORITHM_PARITY_N
;
1629 char *ls
= map_num(r5layout
, info
->new_layout
);
1632 /* Current RAID6 layout has a RAID5
1635 strcat(strcpy(layout
, ls
), "-6");
1636 l
= map_name(r6layout
, layout
);
1638 return "Cannot find RAID6 layout to convert to";
1640 /* Current RAID6 has no equivalent.
1641 * If it is already a '-6' layout we
1642 * can leave it unchanged, else we must
1645 ls
= map_num(r6layout
,
1648 strcmp(ls
+strlen(ls
)-2, "-6") != 0)
1649 return "Please specify new layout";
1650 l
= info
->new_layout
;
1652 re
->after
.layout
= l
;
1658 /* We must already be at level 6 */
1660 return "Impossible level change";
1661 if (info
->new_layout
== UnSet
)
1662 re
->after
.layout
= info
->array
.layout
;
1664 re
->after
.layout
= info
->new_layout
;
1667 return "Impossible level change requested";
1669 if (info
->delta_disks
== UnSet
)
1670 info
->delta_disks
= delta_parity
;
1672 re
->after
.data_disks
=
1673 (re
->before
.data_disks
+ info
->delta_disks
- delta_parity
);
1675 switch (re
->level
) {
1687 /* So we have a restripe operation, we need to calculate the number
1688 * of blocks per reshape operation.
1690 re
->new_size
= info
->component_size
* re
->before
.data_disks
;
1691 if (info
->new_chunk
== 0)
1692 info
->new_chunk
= info
->array
.chunk_size
;
1693 if (re
->after
.data_disks
== re
->before
.data_disks
&&
1694 re
->after
.layout
== re
->before
.layout
&&
1695 info
->new_chunk
== info
->array
.chunk_size
) {
1696 /* Nothing to change, can change level immediately. */
1697 re
->level
= info
->new_level
;
1698 re
->backup_blocks
= 0;
1701 if (re
->after
.data_disks
== 1 && re
->before
.data_disks
== 1) {
1702 /* chunk and layout changes make no difference */
1703 re
->level
= info
->new_level
;
1704 re
->backup_blocks
= 0;
1708 if (re
->after
.data_disks
== re
->before
.data_disks
&&
1709 get_linux_version() < 2006032)
1710 return "in-place reshape is not safe before 2.6.32 - sorry.";
1712 if (re
->after
.data_disks
< re
->before
.data_disks
&&
1713 get_linux_version() < 2006030)
1714 return "reshape to fewer devices is not supported before 2.6.30 - sorry.";
1716 re
->backup_blocks
= compute_backup_blocks(
1717 info
->new_chunk
, info
->array
.chunk_size
,
1718 re
->after
.data_disks
, re
->before
.data_disks
);
1719 re
->min_offset_change
= re
->backup_blocks
/ re
->before
.data_disks
;
1721 re
->new_size
= info
->component_size
* re
->after
.data_disks
;
1725 static int set_array_size(struct supertype
*st
, struct mdinfo
*sra
,
1728 struct mdinfo
*info
;
1732 if ((st
== NULL
) || (sra
== NULL
))
1735 if (text_version
== NULL
)
1736 text_version
= sra
->text_version
;
1737 subarray
= strchr(text_version
+ 1, '/')+1;
1738 info
= st
->ss
->container_content(st
, subarray
);
1740 unsigned long long current_size
= 0;
1741 unsigned long long new_size
= info
->custom_array_size
/2;
1743 if (sysfs_get_ll(sra
, NULL
, "array_size", ¤t_size
) == 0 &&
1744 new_size
> current_size
) {
1745 if (sysfs_set_num(sra
, NULL
, "array_size", new_size
)
1747 dprintf("Error: Cannot set array size");
1750 dprintf("Array size changed");
1752 dprintf_cont(" from %llu to %llu.\n",
1753 current_size
, new_size
);
1757 dprintf("Error: set_array_size(): info pointer in NULL\n");
1762 static int reshape_array(char *container
, int fd
, char *devname
,
1763 struct supertype
*st
, struct mdinfo
*info
,
1764 int force
, struct mddev_dev
*devlist
,
1765 unsigned long long data_offset
,
1766 char *backup_file
, int verbose
, int forked
,
1767 int restart
, int freeze_reshape
);
1768 static int reshape_container(char *container
, char *devname
,
1770 struct supertype
*st
,
1771 struct mdinfo
*info
,
1773 char *backup_file
, int verbose
,
1774 int forked
, int restart
, int freeze_reshape
);
1776 int Grow_reshape(char *devname
, int fd
,
1777 struct mddev_dev
*devlist
,
1778 unsigned long long data_offset
,
1779 struct context
*c
, struct shape
*s
)
1781 /* Make some changes in the shape of an array.
1782 * The kernel must support the change.
1784 * There are three different changes. Each can trigger
1785 * a resync or recovery so we freeze that until we have
1786 * requested everything (if kernel supports freezing - 2.6.30).
1788 * - change size (i.e. component_size)
1790 * - change layout/chunksize/ndisks
1792 * The last can require a reshape. It is different on different
1793 * levels so we need to check the level before actioning it.
1794 * Some times the level change needs to be requested after the
1795 * reshape (e.g. raid6->raid5, raid5->raid0)
1798 struct mdu_array_info_s array
;
1800 struct supertype
*st
;
1801 char *subarray
= NULL
;
1805 char *container
= NULL
;
1808 struct mddev_dev
*dv
;
1814 if (md_get_array_info(fd
, &array
) < 0) {
1815 pr_err("%s is not an active md array - aborting\n",
1819 if (s
->level
!= UnSet
&& s
->chunk
) {
1820 pr_err("Cannot change array level in the same operation as changing chunk size.\n");
1824 if (data_offset
!= INVALID_SECTORS
&& array
.level
!= 10 &&
1825 (array
.level
< 4 || array
.level
> 6)) {
1826 pr_err("--grow --data-offset not yet supported\n");
1831 (s
->chunk
|| s
->level
!= UnSet
|| s
->layout_str
|| s
->raiddisks
)) {
1832 pr_err("cannot change component size at the same time as other changes.\n"
1833 " Change size first, then check data is intact before making other changes.\n");
1837 if (s
->raiddisks
&& s
->raiddisks
< array
.raid_disks
&&
1838 array
.level
> 1 && get_linux_version() < 2006032 &&
1839 !check_env("MDADM_FORCE_FEWER")) {
1840 pr_err("reducing the number of devices is not safe before Linux 2.6.32\n"
1841 " Please use a newer kernel\n");
1845 if (array
.level
> 1 && s
->size
> 1 &&
1846 (unsigned long long) (array
.chunk_size
/ 1024) > s
->size
) {
1847 pr_err("component size must be larger than chunk size.\n");
1851 st
= super_by_fd(fd
, &subarray
);
1853 pr_err("Unable to determine metadata format for %s\n", devname
);
1856 if (s
->raiddisks
> st
->max_devs
) {
1857 pr_err("Cannot increase raid-disks on this array beyond %d\n", st
->max_devs
);
1860 if (s
->level
== 0 && (array
.state
& (1 << MD_SB_BITMAP_PRESENT
)) &&
1861 !(array
.state
& (1 << MD_SB_CLUSTERED
)) && !st
->ss
->external
) {
1862 array
.state
&= ~(1 << MD_SB_BITMAP_PRESENT
);
1863 if (md_set_array_info(fd
, &array
) != 0) {
1864 pr_err("failed to remove internal bitmap.\n");
1869 /* in the external case we need to check that the requested reshape is
1870 * supported, and perform an initial check that the container holds the
1871 * pre-requisite spare devices (mdmon owns final validation)
1873 if (st
->ss
->external
) {
1877 container
= st
->container_devnm
;
1878 cfd
= open_dev_excl(st
->container_devnm
);
1880 container
= st
->devnm
;
1882 cfd
= open_dev_excl(st
->devnm
);
1886 pr_err("Unable to open container for %s\n", devname
);
1891 retval
= st
->ss
->load_container(st
, cfd
, NULL
);
1894 pr_err("Cannot read superblock for %s\n", devname
);
1899 /* check if operation is supported for metadata handler */
1900 if (st
->ss
->container_content
) {
1901 struct mdinfo
*cc
= NULL
;
1902 struct mdinfo
*content
= NULL
;
1904 cc
= st
->ss
->container_content(st
, subarray
);
1905 for (content
= cc
; content
; content
= content
->next
) {
1906 int allow_reshape
= 1;
1908 /* check if reshape is allowed based on metadata
1909 * indications stored in content.array.status
1911 if (content
->array
.state
&
1912 (1 << MD_SB_BLOCK_VOLUME
))
1914 if (content
->array
.state
&
1915 (1 << MD_SB_BLOCK_CONTAINER_RESHAPE
))
1917 if (!allow_reshape
) {
1918 pr_err("cannot reshape arrays in container with unsupported metadata: %s(%s)\n",
1919 devname
, container
);
1924 if (content
->consistency_policy
==
1925 CONSISTENCY_POLICY_PPL
) {
1926 pr_err("Operation not supported when ppl consistency policy is enabled\n");
1931 if (content
->consistency_policy
==
1932 CONSISTENCY_POLICY_BITMAP
) {
1933 pr_err("Operation not supported when write-intent bitmap is enabled\n");
1941 if (mdmon_running(container
))
1942 st
->update_tail
= &st
->updates
;
1946 for (dv
= devlist
; dv
; dv
= dv
->next
)
1948 if (s
->raiddisks
> array
.raid_disks
&&
1949 array
.spare_disks
+ added_disks
<
1950 (s
->raiddisks
- array
.raid_disks
) &&
1952 pr_err("Need %d spare%s to avoid degraded array, and only have %d.\n"
1953 " Use --force to over-ride this check.\n",
1954 s
->raiddisks
- array
.raid_disks
,
1955 s
->raiddisks
- array
.raid_disks
== 1 ? "" : "s",
1956 array
.spare_disks
+ added_disks
);
1960 sra
= sysfs_read(fd
, NULL
, GET_LEVEL
| GET_DISKS
| GET_DEVS
|
1961 GET_STATE
| GET_VERSION
);
1963 if (st
->ss
->external
&& subarray
== NULL
) {
1964 array
.level
= LEVEL_CONTAINER
;
1965 sra
->array
.level
= LEVEL_CONTAINER
;
1968 pr_err("failed to read sysfs parameters for %s\n",
1972 frozen
= freeze(st
);
1974 /* freeze() already spewed the reason */
1977 } else if (frozen
< 0) {
1978 pr_err("%s is performing resync/recovery and cannot be reshaped\n", devname
);
1983 /* ========= set size =============== */
1985 (s
->size
== MAX_SIZE
|| s
->size
!= (unsigned)array
.size
)) {
1986 unsigned long long orig_size
= get_component_size(fd
)/2;
1987 unsigned long long min_csize
;
1989 int raid0_takeover
= 0;
1992 orig_size
= (unsigned) array
.size
;
1994 if (orig_size
== 0) {
1995 pr_err("Cannot set device size in this type of array.\n");
2000 if (array
.level
== 0) {
2001 pr_err("Component size change is not supported for RAID0\n");
2006 if (reshape_super(st
, s
->size
, UnSet
, UnSet
, 0, 0, UnSet
, NULL
,
2007 devname
, APPLY_METADATA_CHANGES
,
2013 if (st
->ss
->external
) {
2014 /* metadata can have size limitation
2015 * update size value according to metadata information
2017 struct mdinfo
*sizeinfo
=
2018 st
->ss
->container_content(st
, subarray
);
2020 unsigned long long new_size
=
2021 sizeinfo
->custom_array_size
/2;
2022 int data_disks
= get_data_disks(
2023 sizeinfo
->array
.level
,
2024 sizeinfo
->array
.layout
,
2025 sizeinfo
->array
.raid_disks
);
2026 new_size
/= data_disks
;
2027 dprintf("Metadata size correction from %llu to %llu (%llu)\n",
2028 orig_size
, new_size
,
2029 new_size
* data_disks
);
2031 sysfs_free(sizeinfo
);
2035 /* Update the size of each member device in case
2036 * they have been resized. This will never reduce
2037 * below the current used-size. The "size" attribute
2038 * understands '0' to mean 'max'.
2041 for (mdi
= sra
->devs
; mdi
; mdi
= mdi
->next
) {
2042 sysfs_set_num(sra
, mdi
, "size",
2043 s
->size
== MAX_SIZE
? 0 : s
->size
);
2044 if (array
.not_persistent
== 0 &&
2045 array
.major_version
== 0 &&
2046 get_linux_version() < 3001000) {
2047 /* Dangerous to allow size to exceed 2TB */
2048 unsigned long long csize
;
2049 if (sysfs_get_ll(sra
, mdi
, "size",
2051 if (csize
>= 2ULL*1024*1024*1024)
2052 csize
= 2ULL*1024*1024*1024;
2053 if ((min_csize
== 0 ||
2054 (min_csize
> csize
)))
2059 if (min_csize
&& s
->size
> min_csize
) {
2060 pr_err("Cannot safely make this array use more than 2TB per device on this kernel.\n");
2062 goto size_change_error
;
2064 if (min_csize
&& s
->size
== MAX_SIZE
) {
2065 /* Don't let the kernel choose a size - it will get
2068 pr_err("Limited v0.90 array to 2TB per device\n");
2069 s
->size
= min_csize
;
2071 if (st
->ss
->external
) {
2072 if (sra
->array
.level
== 0) {
2073 rv
= sysfs_set_str(sra
, NULL
, "level", "raid5");
2076 /* get array parameters after takeover
2077 * to change one parameter at time only
2079 rv
= md_get_array_info(fd
, &array
);
2082 /* make sure mdmon is
2083 * aware of the new level */
2084 if (!mdmon_running(st
->container_devnm
))
2085 start_mdmon(st
->container_devnm
);
2086 ping_monitor(container
);
2087 if (mdmon_running(st
->container_devnm
) &&
2088 st
->update_tail
== NULL
)
2089 st
->update_tail
= &st
->updates
;
2092 if (s
->size
== MAX_SIZE
)
2094 array
.size
= s
->size
;
2095 if (s
->size
& ~INT32_MAX
) {
2096 /* got truncated to 32bit, write to
2097 * component_size instead
2100 rv
= sysfs_set_num(sra
, NULL
,
2101 "component_size", s
->size
);
2105 rv
= md_set_array_info(fd
, &array
);
2107 /* manage array size when it is managed externally
2109 if ((rv
== 0) && st
->ss
->external
)
2110 rv
= set_array_size(st
, sra
, sra
->text_version
);
2113 if (raid0_takeover
) {
2114 /* do not recync non-existing parity,
2115 * we will drop it anyway
2117 sysfs_set_str(sra
, NULL
, "sync_action", "frozen");
2118 /* go back to raid0, drop parity disk
2120 sysfs_set_str(sra
, NULL
, "level", "raid0");
2121 md_get_array_info(fd
, &array
);
2128 /* restore metadata */
2129 if (reshape_super(st
, orig_size
, UnSet
, UnSet
, 0, 0,
2130 UnSet
, NULL
, devname
,
2131 ROLLBACK_METADATA_CHANGES
,
2134 pr_err("Cannot set device size for %s: %s\n",
2135 devname
, strerror(err
));
2137 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2138 cont_err("Bitmap must be removed before size can be changed\n");
2142 if (s
->assume_clean
) {
2143 /* This will fail on kernels older than 3.0 unless
2144 * a backport has been arranged.
2147 sysfs_set_str(sra
, NULL
, "resync_start",
2149 pr_err("--assume-clean not supported with --grow on this kernel\n");
2151 md_get_array_info(fd
, &array
);
2152 s
->size
= get_component_size(fd
)/2;
2154 s
->size
= array
.size
;
2155 if (c
->verbose
>= 0) {
2156 if (s
->size
== orig_size
)
2157 pr_err("component size of %s unchanged at %lluK\n",
2160 pr_err("component size of %s has been set to %lluK\n",
2164 } else if (array
.level
!= LEVEL_CONTAINER
) {
2165 s
->size
= get_component_size(fd
)/2;
2167 s
->size
= array
.size
;
2170 /* See if there is anything else to do */
2171 if ((s
->level
== UnSet
|| s
->level
== array
.level
) &&
2172 (s
->layout_str
== NULL
) &&
2173 (s
->chunk
== 0 || s
->chunk
== array
.chunk_size
) &&
2174 data_offset
== INVALID_SECTORS
&&
2175 (s
->raiddisks
== 0 || s
->raiddisks
== array
.raid_disks
)) {
2176 /* Nothing more to do */
2177 if (!changed
&& c
->verbose
>= 0)
2178 pr_err("%s: no change requested\n", devname
);
2182 /* ========= check for Raid10/Raid1 -> Raid0 conversion ===============
2183 * current implementation assumes that following conditions must be met:
2186 * - near_copies == 2
2188 if ((s
->level
== 0 && array
.level
== 10 && sra
&&
2189 array
.layout
== ((1 << 8) + 2) && !(array
.raid_disks
& 1)) ||
2190 (s
->level
== 0 && array
.level
== 1 && sra
)) {
2193 err
= remove_disks_for_takeover(st
, sra
, array
.layout
);
2195 dprintf("Array cannot be reshaped\n");
2201 /* Make sure mdmon has seen the device removal
2202 * and updated metadata before we continue with
2206 ping_monitor(container
);
2209 memset(&info
, 0, sizeof(info
));
2211 if (sysfs_init(&info
, fd
, NULL
)) {
2212 pr_err("failed to initialize sysfs.\n");
2216 strcpy(info
.text_version
, sra
->text_version
);
2217 info
.component_size
= s
->size
*2;
2218 info
.new_level
= s
->level
;
2219 info
.new_chunk
= s
->chunk
* 1024;
2220 if (info
.array
.level
== LEVEL_CONTAINER
) {
2221 info
.delta_disks
= UnSet
;
2222 info
.array
.raid_disks
= s
->raiddisks
;
2223 } else if (s
->raiddisks
)
2224 info
.delta_disks
= s
->raiddisks
- info
.array
.raid_disks
;
2226 info
.delta_disks
= UnSet
;
2227 if (s
->layout_str
== NULL
) {
2228 info
.new_layout
= UnSet
;
2229 if (info
.array
.level
== 6 &&
2230 (info
.new_level
== 6 || info
.new_level
== UnSet
) &&
2231 info
.array
.layout
>= 16) {
2232 pr_err("%s has a non-standard layout. If you wish to preserve this\n", devname
);
2233 cont_err("during the reshape, please specify --layout=preserve\n");
2234 cont_err("If you want to change it, specify a layout or use --layout=normalise\n");
2238 } else if (strcmp(s
->layout_str
, "normalise") == 0 ||
2239 strcmp(s
->layout_str
, "normalize") == 0) {
2240 /* If we have a -6 RAID6 layout, remove the '-6'. */
2241 info
.new_layout
= UnSet
;
2242 if (info
.array
.level
== 6 && info
.new_level
== UnSet
) {
2244 strcpy(l
, map_num(r6layout
, info
.array
.layout
));
2245 h
= strrchr(l
, '-');
2246 if (h
&& strcmp(h
, "-6") == 0) {
2248 info
.new_layout
= map_name(r6layout
, l
);
2251 pr_err("%s is only meaningful when reshaping a RAID6 array.\n", s
->layout_str
);
2255 } else if (strcmp(s
->layout_str
, "preserve") == 0) {
2256 /* This means that a non-standard RAID6 layout
2259 * - When reshape a RAID6 (e.g. adding a device)
2260 * which is in a non-standard layout, it is OK
2261 * to preserve that layout.
2262 * - When converting a RAID5 to RAID6, leave it in
2263 * the XXX-6 layout, don't re-layout.
2265 if (info
.array
.level
== 6 && info
.new_level
== UnSet
)
2266 info
.new_layout
= info
.array
.layout
;
2267 else if (info
.array
.level
== 5 && info
.new_level
== 6) {
2269 strcpy(l
, map_num(r5layout
, info
.array
.layout
));
2271 info
.new_layout
= map_name(r6layout
, l
);
2273 pr_err("%s in only meaningful when reshaping to RAID6\n", s
->layout_str
);
2278 int l
= info
.new_level
;
2280 l
= info
.array
.level
;
2283 info
.new_layout
= map_name(r5layout
, s
->layout_str
);
2286 info
.new_layout
= map_name(r6layout
, s
->layout_str
);
2289 info
.new_layout
= parse_layout_10(s
->layout_str
);
2292 info
.new_layout
= parse_layout_faulty(s
->layout_str
);
2295 pr_err("layout not meaningful with this level\n");
2299 if (info
.new_layout
== UnSet
) {
2300 pr_err("layout %s not understood for this level\n",
2307 if (array
.level
== LEVEL_FAULTY
) {
2308 if (s
->level
!= UnSet
&& s
->level
!= array
.level
) {
2309 pr_err("cannot change level of Faulty device\n");
2313 pr_err("cannot set chunksize of Faulty device\n");
2316 if (s
->raiddisks
&& s
->raiddisks
!= 1) {
2317 pr_err("cannot set raid_disks of Faulty device\n");
2320 if (s
->layout_str
) {
2321 if (md_get_array_info(fd
, &array
) != 0) {
2322 dprintf("Cannot get array information.\n");
2325 array
.layout
= info
.new_layout
;
2326 if (md_set_array_info(fd
, &array
) != 0) {
2327 pr_err("failed to set new layout\n");
2329 } else if (c
->verbose
>= 0)
2330 printf("layout for %s set to %d\n",
2331 devname
, array
.layout
);
2333 } else if (array
.level
== LEVEL_CONTAINER
) {
2334 /* This change is to be applied to every array in the
2335 * container. This is only needed when the metadata imposes
2336 * restraints of the various arrays in the container.
2337 * Currently we only know that IMSM requires all arrays
2338 * to have the same number of devices so changing the
2339 * number of devices (On-Line Capacity Expansion) must be
2340 * performed at the level of the container
2343 rv
= reshape_container(container
, devname
, -1, st
, &info
,
2344 c
->force
, c
->backup_file
, c
->verbose
,
2348 /* get spare devices from external metadata
2350 if (st
->ss
->external
) {
2351 struct mdinfo
*info2
;
2353 info2
= st
->ss
->container_content(st
, subarray
);
2355 info
.array
.spare_disks
=
2356 info2
->array
.spare_disks
;
2361 /* Impose these changes on a single array. First
2362 * check that the metadata is OK with the change. */
2364 if (reshape_super(st
, 0, info
.new_level
,
2365 info
.new_layout
, info
.new_chunk
,
2366 info
.array
.raid_disks
, info
.delta_disks
,
2367 c
->backup_file
, devname
,
2368 APPLY_METADATA_CHANGES
, c
->verbose
)) {
2373 rv
= reshape_array(container
, fd
, devname
, st
, &info
, c
->force
,
2374 devlist
, data_offset
, c
->backup_file
,
2375 c
->verbose
, 0, 0, 0);
2385 /* verify_reshape_position()
2386 * Function checks if reshape position in metadata is not farther
2387 * than position in md.
2389 * 0 : not valid sysfs entry
2390 * it can be caused by not started reshape, it should be started
2391 * by reshape array or raid0 array is before takeover
2392 * -1 : error, reshape position is obviously wrong
2393 * 1 : success, reshape progress correct or updated
2395 static int verify_reshape_position(struct mdinfo
*info
, int level
)
2401 /* read sync_max, failure can mean raid0 array */
2402 rv
= sysfs_get_str(info
, NULL
, "sync_max", buf
, 40);
2406 unsigned long long position
= strtoull(buf
, &ep
, 0);
2408 dprintf("Read sync_max sysfs entry is: %s\n", buf
);
2409 if (!(ep
== buf
|| (*ep
!= 0 && *ep
!= '\n' && *ep
!= ' '))) {
2410 position
*= get_data_disks(level
,
2412 info
->array
.raid_disks
);
2413 if (info
->reshape_progress
< position
) {
2414 dprintf("Corrected reshape progress (%llu) to md position (%llu)\n",
2415 info
->reshape_progress
, position
);
2416 info
->reshape_progress
= position
;
2418 } else if (info
->reshape_progress
> position
) {
2419 pr_err("Fatal error: array reshape was not properly frozen (expected reshape position is %llu, but reshape progress is %llu.\n",
2420 position
, info
->reshape_progress
);
2423 dprintf("Reshape position in md and metadata are the same;");
2427 } else if (rv
== 0) {
2428 /* for valid sysfs entry, 0-length content
2429 * should be indicated as error
2437 static unsigned long long choose_offset(unsigned long long lo
,
2438 unsigned long long hi
,
2439 unsigned long long min
,
2440 unsigned long long max
)
2442 /* Choose a new offset between hi and lo.
2443 * It must be between min and max, but
2444 * we would prefer something near the middle of hi/lo, and also
2445 * prefer to be aligned to a big power of 2.
2447 * So we start with the middle, then for each bit,
2448 * starting at '1' and increasing, if it is set, we either
2449 * add it or subtract it if possible, preferring the option
2450 * which is furthest from the boundary.
2452 * We stop once we get a 1MB alignment. As units are in sectors,
2453 * 1MB = 2*1024 sectors.
2455 unsigned long long choice
= (lo
+ hi
) / 2;
2456 unsigned long long bit
= 1;
2458 for (bit
= 1; bit
< 2*1024; bit
= bit
<< 1) {
2459 unsigned long long bigger
, smaller
;
2460 if (! (bit
& choice
))
2462 bigger
= choice
+ bit
;
2463 smaller
= choice
- bit
;
2464 if (bigger
> max
&& smaller
< min
)
2468 else if (smaller
< min
)
2470 else if (hi
- bigger
> smaller
- lo
)
2478 static int set_new_data_offset(struct mdinfo
*sra
, struct supertype
*st
,
2479 char *devname
, int delta_disks
,
2480 unsigned long long data_offset
,
2481 unsigned long long min
,
2487 unsigned long long before
, after
;
2489 /* Need to find min space before and after so same is used
2492 before
= UINT64_MAX
;
2494 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
2498 struct supertype
*st2
;
2499 struct mdinfo info2
;
2501 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
2503 dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 0);
2504 dfd
= dev_open(dn
, O_RDONLY
);
2506 pr_err("%s: cannot open component %s\n",
2507 devname
, dn
? dn
: "-unknown-");
2510 st2
= dup_super(st
);
2511 rv
= st2
->ss
->load_super(st2
,dfd
, NULL
);
2515 pr_err("%s: cannot get superblock from %s\n",
2519 st2
->ss
->getinfo_super(st2
, &info2
, NULL
);
2520 st2
->ss
->free_super(st2
);
2522 if (info2
.space_before
== 0 &&
2523 info2
.space_after
== 0) {
2524 /* Metadata doesn't support data_offset changes */
2526 pr_err("%s: Metadata version doesn't support data_offset changes\n",
2530 if (before
> info2
.space_before
)
2531 before
= info2
.space_before
;
2532 if (after
> info2
.space_after
)
2533 after
= info2
.space_after
;
2535 if (data_offset
!= INVALID_SECTORS
) {
2537 if (info2
.data_offset
== data_offset
) {
2538 pr_err("%s: already has that data_offset\n",
2542 if (data_offset
< info2
.data_offset
)
2546 } else if ((data_offset
<= info2
.data_offset
&&
2548 (data_offset
>= info2
.data_offset
&&
2550 pr_err("%s: differing data offsets on devices make this --data-offset setting impossible\n",
2556 if (before
== UINT64_MAX
)
2557 /* impossible really, there must be no devices */
2560 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
2561 char *dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 0);
2562 unsigned long long new_data_offset
;
2564 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
2566 if (delta_disks
< 0) {
2567 /* Don't need any space as array is shrinking
2568 * just move data_offset up by min
2570 if (data_offset
== INVALID_SECTORS
)
2571 new_data_offset
= sd
->data_offset
+ min
;
2573 if (data_offset
< sd
->data_offset
+ min
) {
2574 pr_err("--data-offset too small for %s\n",
2578 new_data_offset
= data_offset
;
2580 } else if (delta_disks
> 0) {
2581 /* need space before */
2585 pr_err("Insufficient head-space for reshape on %s\n",
2589 if (data_offset
== INVALID_SECTORS
)
2590 new_data_offset
= sd
->data_offset
- min
;
2592 if (data_offset
> sd
->data_offset
- min
) {
2593 pr_err("--data-offset too large for %s\n",
2597 new_data_offset
= data_offset
;
2601 /* can move up or down. If 'data_offset'
2602 * was set we would have already decided,
2603 * so just choose direction with most space.
2610 sysfs_set_str(sra
, NULL
, "reshape_direction",
2611 dir
== 1 ? "backwards" : "forwards");
2613 /* Increase data offset */
2617 pr_err("Insufficient tail-space for reshape on %s\n",
2621 if (data_offset
!= INVALID_SECTORS
&&
2622 data_offset
< sd
->data_offset
+ min
) {
2623 pr_err("--data-offset too small on %s\n",
2627 if (data_offset
!= INVALID_SECTORS
)
2628 new_data_offset
= data_offset
;
2630 new_data_offset
= choose_offset(sd
->data_offset
,
2631 sd
->data_offset
+ after
,
2632 sd
->data_offset
+ min
,
2633 sd
->data_offset
+ after
);
2635 /* Decrease data offset */
2639 pr_err("insufficient head-room on %s\n",
2643 if (data_offset
!= INVALID_SECTORS
&&
2644 data_offset
> sd
->data_offset
- min
) {
2645 pr_err("--data-offset too large on %s\n",
2649 if (data_offset
!= INVALID_SECTORS
)
2650 new_data_offset
= data_offset
;
2652 new_data_offset
= choose_offset(sd
->data_offset
- before
,
2654 sd
->data_offset
- before
,
2655 sd
->data_offset
- min
);
2658 err
= sysfs_set_num(sra
, sd
, "new_offset", new_data_offset
);
2659 if (err
< 0 && errno
== E2BIG
) {
2660 /* try again after increasing data size to max */
2661 err
= sysfs_set_num(sra
, sd
, "size", 0);
2662 if (err
< 0 && errno
== EINVAL
&&
2663 !(sd
->disk
.state
& (1<<MD_DISK_SYNC
))) {
2664 /* some kernels have a bug where you cannot
2665 * use '0' on spare devices. */
2666 sysfs_set_num(sra
, sd
, "size",
2667 (sra
->component_size
+ after
)/2);
2669 err
= sysfs_set_num(sra
, sd
, "new_offset",
2673 if (errno
== E2BIG
&& data_offset
!= INVALID_SECTORS
) {
2674 pr_err("data-offset is too big for %s\n", dn
);
2677 if (sd
== sra
->devs
&&
2678 (errno
== ENOENT
|| errno
== E2BIG
))
2679 /* Early kernel, no 'new_offset' file,
2680 * or kernel doesn't like us.
2681 * For RAID5/6 this is not fatal
2684 pr_err("Cannot set new_offset for %s\n", dn
);
2692 /* Just use a backup file */
2696 static int raid10_reshape(char *container
, int fd
, char *devname
,
2697 struct supertype
*st
, struct mdinfo
*info
,
2698 struct reshape
*reshape
,
2699 unsigned long long data_offset
,
2700 int force
, int verbose
)
2702 /* Changing raid_disks, layout, chunksize or possibly
2703 * just data_offset for a RAID10.
2704 * We must always change data_offset. We change by at least
2705 * ->min_offset_change which is the largest of the old and new
2707 * If raid_disks is increasing, then data_offset must decrease
2708 * by at least this copy size.
2709 * If raid_disks is unchanged, data_offset must increase or
2710 * decrease by at least min_offset_change but preferably by much more.
2711 * We choose half of the available space.
2712 * If raid_disks is decreasing, data_offset must increase by
2713 * at least min_offset_change. To allow of this, component_size
2714 * must be decreased by the same amount.
2716 * So we calculate the required minimum and direction, possibly
2717 * reduce the component_size, then iterate through the devices
2718 * and set the new_data_offset.
2719 * If that all works, we set chunk_size, layout, raid_disks, and start
2723 unsigned long long min
;
2726 sra
= sysfs_read(fd
, NULL
,
2727 GET_COMPONENT
|GET_DEVS
|GET_OFFSET
|GET_STATE
|GET_CHUNK
2730 pr_err("%s: Cannot get array details from sysfs\n", devname
);
2733 min
= reshape
->min_offset_change
;
2735 if (info
->delta_disks
)
2736 sysfs_set_str(sra
, NULL
, "reshape_direction",
2737 info
->delta_disks
< 0 ? "backwards" : "forwards");
2738 if (info
->delta_disks
< 0 && info
->space_after
< min
) {
2739 int rv
= sysfs_set_num(sra
, NULL
, "component_size",
2740 (sra
->component_size
- min
)/2);
2742 pr_err("cannot reduce component size\n");
2746 err
= set_new_data_offset(sra
, st
, devname
, info
->delta_disks
,
2747 data_offset
, min
, 0);
2749 pr_err("Cannot set new_data_offset: RAID10 reshape not\n");
2750 cont_err("supported on this kernel\n");
2756 if (!err
&& sysfs_set_num(sra
, NULL
, "chunk_size", info
->new_chunk
) < 0)
2758 if (!err
&& sysfs_set_num(sra
, NULL
, "layout",
2759 reshape
->after
.layout
) < 0)
2762 sysfs_set_num(sra
, NULL
, "raid_disks",
2763 info
->array
.raid_disks
+ info
->delta_disks
) < 0)
2765 if (!err
&& sysfs_set_str(sra
, NULL
, "sync_action", "reshape") < 0)
2768 pr_err("Cannot set array shape for %s\n",
2771 (info
->array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2772 cont_err(" Bitmap must be removed before shape can be changed\n");
2782 static void get_space_after(int fd
, struct supertype
*st
, struct mdinfo
*info
)
2784 struct mdinfo
*sra
, *sd
;
2785 /* Initialisation to silence compiler warning */
2786 unsigned long long min_space_before
= 0, min_space_after
= 0;
2789 sra
= sysfs_read(fd
, NULL
, GET_DEVS
);
2792 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
2795 struct supertype
*st2
;
2796 struct mdinfo info2
;
2798 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
2800 dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 0);
2801 dfd
= dev_open(dn
, O_RDONLY
);
2804 st2
= dup_super(st
);
2805 if (st2
->ss
->load_super(st2
,dfd
, NULL
)) {
2811 st2
->ss
->getinfo_super(st2
, &info2
, NULL
);
2812 st2
->ss
->free_super(st2
);
2815 min_space_before
> info2
.space_before
)
2816 min_space_before
= info2
.space_before
;
2818 min_space_after
> info2
.space_after
)
2819 min_space_after
= info2
.space_after
;
2822 if (sd
== NULL
&& !first
) {
2823 info
->space_after
= min_space_after
;
2824 info
->space_before
= min_space_before
;
2829 static void update_cache_size(char *container
, struct mdinfo
*sra
,
2830 struct mdinfo
*info
,
2831 int disks
, unsigned long long blocks
)
2833 /* Check that the internal stripe cache is
2834 * large enough, or it won't work.
2835 * It must hold at least 4 stripes of the larger
2838 unsigned long cache
;
2839 cache
= max(info
->array
.chunk_size
, info
->new_chunk
);
2840 cache
*= 4; /* 4 stripes minimum */
2841 cache
/= 512; /* convert to sectors */
2842 /* make sure there is room for 'blocks' with a bit to spare */
2843 if (cache
< 16 + blocks
/ disks
)
2844 cache
= 16 + blocks
/ disks
;
2845 cache
/= (4096/512); /* Convert from sectors to pages */
2847 if (sra
->cache_size
< cache
)
2848 subarray_set_num(container
, sra
, "stripe_cache_size",
2852 static int impose_reshape(struct mdinfo
*sra
,
2853 struct mdinfo
*info
,
2854 struct supertype
*st
,
2857 char *devname
, char *container
,
2858 struct reshape
*reshape
)
2860 struct mdu_array_info_s array
;
2862 sra
->new_chunk
= info
->new_chunk
;
2865 /* for external metadata checkpoint saved by mdmon can be lost
2866 * or missed /due to e.g. crash/. Check if md is not during
2867 * restart farther than metadata points to.
2868 * If so, this means metadata information is obsolete.
2870 if (st
->ss
->external
)
2871 verify_reshape_position(info
, reshape
->level
);
2872 sra
->reshape_progress
= info
->reshape_progress
;
2874 sra
->reshape_progress
= 0;
2875 if (reshape
->after
.data_disks
< reshape
->before
.data_disks
)
2876 /* start from the end of the new array */
2877 sra
->reshape_progress
= (sra
->component_size
2878 * reshape
->after
.data_disks
);
2881 md_get_array_info(fd
, &array
);
2882 if (info
->array
.chunk_size
== info
->new_chunk
&&
2883 reshape
->before
.layout
== reshape
->after
.layout
&&
2884 st
->ss
->external
== 0) {
2885 /* use SET_ARRAY_INFO but only if reshape hasn't started */
2886 array
.raid_disks
= reshape
->after
.data_disks
+ reshape
->parity
;
2887 if (!restart
&& md_set_array_info(fd
, &array
) != 0) {
2890 pr_err("Cannot set device shape for %s: %s\n",
2891 devname
, strerror(errno
));
2894 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2895 cont_err("Bitmap must be removed before shape can be changed\n");
2899 } else if (!restart
) {
2900 /* set them all just in case some old 'new_*' value
2901 * persists from some earlier problem.
2904 if (sysfs_set_num(sra
, NULL
, "chunk_size", info
->new_chunk
) < 0)
2906 if (!err
&& sysfs_set_num(sra
, NULL
, "layout",
2907 reshape
->after
.layout
) < 0)
2909 if (!err
&& subarray_set_num(container
, sra
, "raid_disks",
2910 reshape
->after
.data_disks
+
2911 reshape
->parity
) < 0)
2914 pr_err("Cannot set device shape for %s\n", devname
);
2917 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2918 cont_err("Bitmap must be removed before shape can be changed\n");
2927 static int impose_level(int fd
, int level
, char *devname
, int verbose
)
2930 struct mdu_array_info_s array
;
2933 if (sysfs_init(&info
, fd
, NULL
)) {
2934 pr_err("failed to initialize sysfs.\n");
2938 md_get_array_info(fd
, &array
);
2939 if (level
== 0 && (array
.level
>= 4 && array
.level
<= 6)) {
2940 /* To convert to RAID0 we need to fail and
2941 * remove any non-data devices. */
2944 int data_disks
= array
.raid_disks
- 1;
2945 if (array
.level
== 6)
2947 if (array
.level
== 5 && array
.layout
!= ALGORITHM_PARITY_N
)
2949 if (array
.level
== 6 && array
.layout
!= ALGORITHM_PARITY_N_6
)
2951 sysfs_set_str(&info
, NULL
,"sync_action", "idle");
2952 /* First remove any spares so no recovery starts */
2953 for (d
= 0, found
= 0;
2954 d
< MAX_DISKS
&& found
< array
.nr_disks
; d
++) {
2955 mdu_disk_info_t disk
;
2957 if (md_get_disk_info(fd
, &disk
) < 0)
2959 if (disk
.major
== 0 && disk
.minor
== 0)
2962 if ((disk
.state
& (1 << MD_DISK_ACTIVE
)) &&
2963 disk
.raid_disk
< data_disks
)
2966 ioctl(fd
, HOT_REMOVE_DISK
,
2967 makedev(disk
.major
, disk
.minor
));
2969 /* Now fail anything left */
2970 md_get_array_info(fd
, &array
);
2971 for (d
= 0, found
= 0;
2972 d
< MAX_DISKS
&& found
< array
.nr_disks
; d
++) {
2973 mdu_disk_info_t disk
;
2975 if (md_get_disk_info(fd
, &disk
) < 0)
2977 if (disk
.major
== 0 && disk
.minor
== 0)
2980 if ((disk
.state
& (1 << MD_DISK_ACTIVE
)) &&
2981 disk
.raid_disk
< data_disks
)
2984 ioctl(fd
, SET_DISK_FAULTY
,
2985 makedev(disk
.major
, disk
.minor
));
2986 hot_remove_disk(fd
, makedev(disk
.major
, disk
.minor
), 1);
2989 c
= map_num(pers
, level
);
2991 int err
= sysfs_set_str(&info
, NULL
, "level", c
);
2994 pr_err("%s: could not set level to %s\n",
2997 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2998 cont_err("Bitmap must be removed before level can be changed\n");
3002 pr_err("level of %s changed to %s\n", devname
, c
);
3008 static void catch_term(int sig
)
3013 static int reshape_array(char *container
, int fd
, char *devname
,
3014 struct supertype
*st
, struct mdinfo
*info
,
3015 int force
, struct mddev_dev
*devlist
,
3016 unsigned long long data_offset
,
3017 char *backup_file
, int verbose
, int forked
,
3018 int restart
, int freeze_reshape
)
3020 struct reshape reshape
;
3023 int orig_level
= UnSet
;
3027 struct mdu_array_info_s array
;
3030 struct mddev_dev
*dv
;
3034 unsigned long long *offsets
= NULL
;
3038 unsigned long blocks
;
3039 unsigned long long array_size
;
3041 struct mdinfo
*sra
= NULL
;
3044 /* when reshaping a RAID0, the component_size might be zero.
3045 * So try to fix that up.
3047 if (md_get_array_info(fd
, &array
) != 0) {
3048 dprintf("Cannot get array information.\n");
3051 if (array
.level
== 0 && info
->component_size
== 0) {
3052 get_dev_size(fd
, NULL
, &array_size
);
3053 info
->component_size
= array_size
/ array
.raid_disks
;
3056 if (array
.level
== 10)
3057 /* Need space_after info */
3058 get_space_after(fd
, st
, info
);
3060 if (info
->reshape_active
) {
3061 int new_level
= info
->new_level
;
3062 info
->new_level
= UnSet
;
3063 if (info
->delta_disks
> 0)
3064 info
->array
.raid_disks
-= info
->delta_disks
;
3065 msg
= analyse_change(devname
, info
, &reshape
);
3066 info
->new_level
= new_level
;
3067 if (info
->delta_disks
> 0)
3068 info
->array
.raid_disks
+= info
->delta_disks
;
3070 /* Make sure the array isn't read-only */
3071 ioctl(fd
, RESTART_ARRAY_RW
, 0);
3073 msg
= analyse_change(devname
, info
, &reshape
);
3075 /* if msg == "", error has already been printed */
3077 pr_err("%s\n", msg
);
3080 if (restart
&& (reshape
.level
!= info
->array
.level
||
3081 reshape
.before
.layout
!= info
->array
.layout
||
3082 reshape
.before
.data_disks
+ reshape
.parity
!=
3083 info
->array
.raid_disks
- max(0, info
->delta_disks
))) {
3084 pr_err("reshape info is not in native format - cannot continue.\n");
3088 if (st
->ss
->external
&& restart
&& (info
->reshape_progress
== 0) &&
3089 !((sysfs_get_str(info
, NULL
, "sync_action",
3090 buf
, sizeof(buf
)) > 0) &&
3091 (strncmp(buf
, "reshape", 7) == 0))) {
3092 /* When reshape is restarted from '0', very begin of array
3093 * it is possible that for external metadata reshape and array
3094 * configuration doesn't happen.
3095 * Check if md has the same opinion, and reshape is restarted
3096 * from 0. If so, this is regular reshape start after reshape
3097 * switch in metadata to next array only.
3099 if ((verify_reshape_position(info
, reshape
.level
) >= 0) &&
3100 (info
->reshape_progress
== 0))
3105 * reshape already started. just skip to monitoring
3108 if (reshape
.backup_blocks
== 0)
3110 if (restart
& RESHAPE_NO_BACKUP
)
3113 /* Need 'sra' down at 'started:' */
3114 sra
= sysfs_read(fd
, NULL
,
3115 GET_COMPONENT
|GET_DEVS
|GET_OFFSET
|GET_STATE
|
3116 GET_CHUNK
|GET_CACHE
);
3118 pr_err("%s: Cannot get array details from sysfs\n",
3124 backup_file
= locate_backup(sra
->sys_name
);
3128 /* The container is frozen but the array may not be.
3129 * So freeze the array so spares don't get put to the wrong use
3130 * FIXME there should probably be a cleaner separation between
3131 * freeze_array and freeze_container.
3133 sysfs_freeze_array(info
);
3134 /* Check we have enough spares to not be degraded */
3136 for (dv
= devlist
; dv
; dv
=dv
->next
)
3138 spares_needed
= max(reshape
.before
.data_disks
,
3139 reshape
.after
.data_disks
) +
3140 reshape
.parity
- array
.raid_disks
;
3142 if (!force
&& info
->new_level
> 1 && info
->array
.level
> 1 &&
3143 spares_needed
> info
->array
.spare_disks
+ added_disks
) {
3144 pr_err("Need %d spare%s to avoid degraded array, and only have %d.\n"
3145 " Use --force to over-ride this check.\n",
3147 spares_needed
== 1 ? "" : "s",
3148 info
->array
.spare_disks
+ added_disks
);
3151 /* Check we have enough spares to not fail */
3152 spares_needed
= max(reshape
.before
.data_disks
,
3153 reshape
.after
.data_disks
)
3155 if ((info
->new_level
> 1 || info
->new_level
== 0) &&
3156 spares_needed
> info
->array
.spare_disks
+added_disks
) {
3157 pr_err("Need %d spare%s to create working array, and only have %d.\n",
3158 spares_needed
, spares_needed
== 1 ? "" : "s",
3159 info
->array
.spare_disks
+ added_disks
);
3163 if (reshape
.level
!= array
.level
) {
3164 int err
= impose_level(fd
, reshape
.level
, devname
, verbose
);
3167 info
->new_layout
= UnSet
; /* after level change,
3168 * layout is meaningless */
3169 orig_level
= array
.level
;
3170 sysfs_freeze_array(info
);
3172 if (reshape
.level
> 0 && st
->ss
->external
) {
3173 /* make sure mdmon is aware of the new level */
3174 if (mdmon_running(container
))
3175 flush_mdmon(container
);
3177 if (!mdmon_running(container
))
3178 start_mdmon(container
);
3179 ping_monitor(container
);
3180 if (mdmon_running(container
) && st
->update_tail
== NULL
)
3181 st
->update_tail
= &st
->updates
;
3184 /* ->reshape_super might have chosen some spares from the
3185 * container that it wants to be part of the new array.
3186 * We can collect them with ->container_content and give
3187 * them to the kernel.
3189 if (st
->ss
->reshape_super
&& st
->ss
->container_content
) {
3190 char *subarray
= strchr(info
->text_version
+1, '/')+1;
3191 struct mdinfo
*info2
=
3192 st
->ss
->container_content(st
, subarray
);
3196 if (sysfs_init(info2
, fd
, st
->devnm
)) {
3197 pr_err("unable to initialize sysfs for %s\n",
3202 /* When increasing number of devices, we need to set
3203 * new raid_disks before adding these, or they might
3206 if (reshape
.backup_blocks
&&
3207 reshape
.after
.data_disks
>
3208 reshape
.before
.data_disks
)
3209 subarray_set_num(container
, info2
, "raid_disks",
3210 reshape
.after
.data_disks
+
3212 for (d
= info2
->devs
; d
; d
= d
->next
) {
3213 if (d
->disk
.state
== 0 &&
3214 d
->disk
.raid_disk
>= 0) {
3215 /* This is a spare that wants to
3216 * be part of the array.
3218 add_disk(fd
, st
, info2
, d
);
3224 /* We might have been given some devices to add to the
3225 * array. Now that the array has been changed to the right
3226 * level and frozen, we can safely add them.
3229 if (Manage_subdevs(devname
, fd
, devlist
, verbose
, 0, NULL
, 0))
3233 if (reshape
.backup_blocks
== 0 && data_offset
!= INVALID_SECTORS
)
3234 reshape
.backup_blocks
= reshape
.before
.data_disks
* info
->array
.chunk_size
/512;
3235 if (reshape
.backup_blocks
== 0) {
3236 /* No restriping needed, but we might need to impose
3237 * some more changes: layout, raid_disks, chunk_size
3239 /* read current array info */
3240 if (md_get_array_info(fd
, &array
) != 0) {
3241 dprintf("Cannot get array information.\n");
3244 /* compare current array info with new values and if
3245 * it is different update them to new */
3246 if (info
->new_layout
!= UnSet
&&
3247 info
->new_layout
!= array
.layout
) {
3248 array
.layout
= info
->new_layout
;
3249 if (md_set_array_info(fd
, &array
) != 0) {
3250 pr_err("failed to set new layout\n");
3252 } else if (verbose
>= 0)
3253 printf("layout for %s set to %d\n",
3254 devname
, array
.layout
);
3256 if (info
->delta_disks
!= UnSet
&& info
->delta_disks
!= 0 &&
3258 (info
->array
.raid_disks
+ info
->delta_disks
)) {
3259 array
.raid_disks
+= info
->delta_disks
;
3260 if (md_set_array_info(fd
, &array
) != 0) {
3261 pr_err("failed to set raid disks\n");
3263 } else if (verbose
>= 0) {
3264 printf("raid_disks for %s set to %d\n",
3265 devname
, array
.raid_disks
);
3268 if (info
->new_chunk
!= 0 &&
3269 info
->new_chunk
!= array
.chunk_size
) {
3270 if (sysfs_set_num(info
, NULL
,
3271 "chunk_size", info
->new_chunk
) != 0) {
3272 pr_err("failed to set chunk size\n");
3274 } else if (verbose
>= 0)
3275 printf("chunk size for %s set to %d\n",
3276 devname
, info
->new_chunk
);
3283 * There are three possibilities.
3284 * 1/ The array will shrink.
3285 * We need to ensure the reshape will pause before reaching
3286 * the 'critical section'. We also need to fork and wait for
3287 * that to happen. When it does we
3288 * suspend/backup/complete/unfreeze
3290 * 2/ The array will not change size.
3291 * This requires that we keep a backup of a sliding window
3292 * so that we can restore data after a crash. So we need
3293 * to fork and monitor progress.
3294 * In future we will allow the data_offset to change, so
3295 * a sliding backup becomes unnecessary.
3297 * 3/ The array will grow. This is relatively easy.
3298 * However the kernel's restripe routines will cheerfully
3299 * overwrite some early data before it is safe. So we
3300 * need to make a backup of the early parts of the array
3301 * and be ready to restore it if rebuild aborts very early.
3302 * For externally managed metadata, we still need a forked
3303 * child to monitor the reshape and suspend IO over the region
3304 * that is being reshaped.
3306 * We backup data by writing it to one spare, or to a
3307 * file which was given on command line.
3309 * In each case, we first make sure that storage is available
3310 * for the required backup.
3312 * - request the shape change.
3313 * - fork to handle backup etc.
3315 /* Check that we can hold all the data */
3316 get_dev_size(fd
, NULL
, &array_size
);
3317 if (reshape
.new_size
< (array_size
/512)) {
3318 pr_err("this change will reduce the size of the array.\n"
3319 " use --grow --array-size first to truncate array.\n"
3320 " e.g. mdadm --grow %s --array-size %llu\n",
3321 devname
, reshape
.new_size
/2);
3325 if (array
.level
== 10) {
3326 /* Reshaping RAID10 does not require any data backup by
3327 * user-space. Instead it requires that the data_offset
3328 * is changed to avoid the need for backup.
3329 * So this is handled very separately
3332 /* Nothing to do. */
3334 return raid10_reshape(container
, fd
, devname
, st
, info
,
3335 &reshape
, data_offset
, force
, verbose
);
3337 sra
= sysfs_read(fd
, NULL
,
3338 GET_COMPONENT
|GET_DEVS
|GET_OFFSET
|GET_STATE
|GET_CHUNK
|
3341 pr_err("%s: Cannot get array details from sysfs\n",
3347 switch(set_new_data_offset(sra
, st
, devname
,
3348 reshape
.after
.data_disks
- reshape
.before
.data_disks
,
3350 reshape
.min_offset_change
, 1)) {
3354 /* Updated data_offset, so it's easy now */
3355 update_cache_size(container
, sra
, info
,
3356 min(reshape
.before
.data_disks
,
3357 reshape
.after
.data_disks
),
3358 reshape
.backup_blocks
);
3360 /* Right, everything seems fine. Let's kick things off.
3364 if (impose_reshape(sra
, info
, st
, fd
, restart
,
3365 devname
, container
, &reshape
) < 0)
3367 if (sysfs_set_str(sra
, NULL
, "sync_action", "reshape") < 0) {
3369 if (errno
!= EINVAL
) {
3370 pr_err("Failed to initiate reshape!\n");
3373 /* revert data_offset and try the old way */
3374 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
3375 sysfs_set_num(sra
, sd
, "new_offset",
3377 sysfs_set_str(sra
, NULL
, "reshape_direction",
3382 if (info
->new_level
== reshape
.level
)
3384 /* need to adjust level when reshape completes */
3386 case -1: /* ignore error, but don't wait */
3388 default: /* parent */
3397 fd
= open_dev(sra
->sys_name
);
3399 impose_level(fd
, info
->new_level
, devname
, verbose
);
3401 case 1: /* Couldn't set data_offset, try the old way */
3402 if (data_offset
!= INVALID_SECTORS
) {
3403 pr_err("Cannot update data_offset on this array\n");
3410 /* Decide how many blocks (sectors) for a reshape
3411 * unit. The number we have so far is just a minimum
3413 blocks
= reshape
.backup_blocks
;
3414 if (reshape
.before
.data_disks
==
3415 reshape
.after
.data_disks
) {
3416 /* Make 'blocks' bigger for better throughput, but
3417 * not so big that we reject it below.
3418 * Try for 16 megabytes
3420 while (blocks
* 32 < sra
->component_size
&& blocks
< 16*1024*2)
3423 pr_err("Need to backup %luK of critical section..\n", blocks
/2);
3425 if (blocks
>= sra
->component_size
/2) {
3426 pr_err("%s: Something wrong - reshape aborted\n", devname
);
3430 /* Now we need to open all these devices so we can read/write.
3432 nrdisks
= max(reshape
.before
.data_disks
,
3433 reshape
.after
.data_disks
) + reshape
.parity
3434 + sra
->array
.spare_disks
;
3435 fdlist
= xcalloc((1+nrdisks
), sizeof(int));
3436 offsets
= xcalloc((1+nrdisks
), sizeof(offsets
[0]));
3438 odisks
= reshape
.before
.data_disks
+ reshape
.parity
;
3439 d
= reshape_prepare_fdlist(devname
, sra
, odisks
, nrdisks
, blocks
,
3440 backup_file
, fdlist
, offsets
);
3444 if ((st
->ss
->manage_reshape
== NULL
) ||
3445 (st
->ss
->recover_backup
== NULL
)) {
3446 if (backup_file
== NULL
) {
3447 if (reshape
.after
.data_disks
<=
3448 reshape
.before
.data_disks
) {
3449 pr_err("%s: Cannot grow - need backup-file\n",
3451 pr_err(" Please provide one with \"--backup=...\"\n");
3453 } else if (d
== odisks
) {
3454 pr_err("%s: Cannot grow - need a spare or backup-file to backup critical section\n", devname
);
3458 if (!reshape_open_backup_file(backup_file
, fd
, devname
,
3460 fdlist
+d
, offsets
+d
,
3461 sra
->sys_name
, restart
)) {
3468 update_cache_size(container
, sra
, info
,
3469 min(reshape
.before
.data_disks
,
3470 reshape
.after
.data_disks
), blocks
);
3472 /* Right, everything seems fine. Let's kick things off.
3473 * If only changing raid_disks, use ioctl, else use
3478 if (impose_reshape(sra
, info
, st
, fd
, restart
,
3479 devname
, container
, &reshape
) < 0)
3482 err
= start_reshape(sra
, restart
, reshape
.before
.data_disks
,
3483 reshape
.after
.data_disks
, st
);
3485 pr_err("Cannot %s reshape for %s\n",
3486 restart
? "continue" : "start", devname
);
3490 sysfs_set_str(sra
, NULL
, "array_state", "active");
3491 if (freeze_reshape
) {
3495 pr_err("Reshape has to be continued from location %llu when root filesystem has been mounted.\n",
3496 sra
->reshape_progress
);
3501 if (continue_via_systemd(container
?: sra
->sys_name
,
3510 /* Now we just need to kick off the reshape and watch, while
3511 * handling backups of the data...
3512 * This is all done by a forked background process.
3514 switch(forked
? 0 : fork()) {
3516 pr_err("Cannot run child to monitor reshape: %s\n",
3530 /* If another array on the same devices is busy, the
3531 * reshape will wait for them. This would mean that
3532 * the first section that we suspend will stay suspended
3533 * for a long time. So check on that possibility
3534 * by looking for "DELAYED" in /proc/mdstat, and if found,
3538 struct mdstat_ent
*mds
, *m
;
3540 mds
= mdstat_read(1, 0);
3541 for (m
= mds
; m
; m
= m
->next
)
3542 if (strcmp(m
->devnm
, sra
->sys_name
) == 0) {
3543 if (m
->resync
&& m
->percent
== RESYNC_DELAYED
)
3546 /* Haven't started the reshape thread
3553 if (delayed
== 1 && get_linux_version() < 3007000) {
3554 pr_err("Reshape is delayed, but cannot wait carefully with this kernel.\n"
3555 " You might experience problems until other reshapes complete.\n");
3559 mdstat_wait(30 - (delayed
-1) * 25);
3562 if (check_env("MDADM_GROW_VERIFY"))
3563 fd
= open(devname
, O_RDONLY
| O_DIRECT
);
3566 mlockall(MCL_FUTURE
);
3568 if (signal_s(SIGTERM
, catch_term
) == SIG_ERR
)
3571 if (st
->ss
->external
) {
3572 /* metadata handler takes it from here */
3573 done
= st
->ss
->manage_reshape(
3574 fd
, sra
, &reshape
, st
, blocks
,
3575 fdlist
, offsets
, d
- odisks
, fdlist
+ odisks
,
3578 done
= child_monitor(
3579 fd
, sra
, &reshape
, st
, blocks
, fdlist
, offsets
,
3580 d
- odisks
, fdlist
+ odisks
, offsets
+ odisks
);
3585 if (backup_file
&& done
) {
3587 bul
= make_backup(sra
->sys_name
);
3590 int l
= readlink(bul
, buf
, sizeof(buf
) - 1);
3598 unlink(backup_file
);
3605 if (!st
->ss
->external
&&
3606 !(reshape
.before
.data_disks
!= reshape
.after
.data_disks
&&
3607 info
->custom_array_size
) && info
->new_level
== reshape
.level
&&
3609 /* no need to wait for the reshape to finish as
3610 * there is nothing more to do.
3617 if (st
->ss
->external
) {
3618 /* Re-load the metadata as much could have changed */
3619 int cfd
= open_dev(st
->container_devnm
);
3621 flush_mdmon(container
);
3622 st
->ss
->free_super(st
);
3623 st
->ss
->load_container(st
, cfd
, container
);
3628 /* set new array size if required customer_array_size is used
3631 if (reshape
.before
.data_disks
!= reshape
.after
.data_disks
&&
3632 info
->custom_array_size
)
3633 set_array_size(st
, info
, info
->text_version
);
3635 if (info
->new_level
!= reshape
.level
) {
3637 fd
= open(devname
, O_RDONLY
);
3638 impose_level(fd
, info
->new_level
, devname
, verbose
);
3640 if (info
->new_level
== 0)
3641 st
->update_tail
= NULL
;
3653 if (orig_level
!= UnSet
&& sra
) {
3654 c
= map_num(pers
, orig_level
);
3655 if (c
&& sysfs_set_str(sra
, NULL
, "level", c
) == 0)
3656 pr_err("aborting level change\n");
3664 /* mdfd handle is passed to be closed in child process (after fork).
3666 int reshape_container(char *container
, char *devname
,
3668 struct supertype
*st
,
3669 struct mdinfo
*info
,
3671 char *backup_file
, int verbose
,
3672 int forked
, int restart
, int freeze_reshape
)
3674 struct mdinfo
*cc
= NULL
;
3676 char last_devnm
[32] = "";
3678 /* component_size is not meaningful for a container,
3679 * so pass '0' meaning 'no change'
3682 reshape_super(st
, 0, info
->new_level
,
3683 info
->new_layout
, info
->new_chunk
,
3684 info
->array
.raid_disks
, info
->delta_disks
,
3685 backup_file
, devname
, APPLY_METADATA_CHANGES
,
3693 /* ping monitor to be sure that update is on disk
3695 ping_monitor(container
);
3697 if (!forked
&& !freeze_reshape
)
3698 if (continue_via_systemd(container
, GROW_SERVICE
))
3701 switch (forked
? 0 : fork()) {
3702 case -1: /* error */
3703 perror("Cannot fork to complete reshape\n");
3706 default: /* parent */
3707 if (!freeze_reshape
)
3708 printf("%s: multi-array reshape continues in background\n", Name
);
3716 /* close unused handle in child process
3722 /* For each member array with reshape_active,
3723 * we need to perform the reshape.
3724 * We pick the first array that needs reshaping and
3725 * reshape it. reshape_array() will re-read the metadata
3726 * so the next time through a different array should be
3727 * ready for reshape.
3728 * It is possible that the 'different' array will not
3729 * be assembled yet. In that case we simple exit.
3730 * When it is assembled, the mdadm which assembles it
3731 * will take over the reshape.
3733 struct mdinfo
*content
;
3735 struct mdstat_ent
*mdstat
;
3741 cc
= st
->ss
->container_content(st
, NULL
);
3743 for (content
= cc
; content
; content
= content
->next
) {
3745 if (!content
->reshape_active
)
3748 subarray
= strchr(content
->text_version
+1, '/')+1;
3749 mdstat
= mdstat_by_subdev(subarray
, container
);
3752 if (mdstat
->active
== 0) {
3753 pr_err("Skipping inactive array %s.\n",
3755 free_mdstat(mdstat
);
3764 devid
= devnm2devid(mdstat
->devnm
);
3765 adev
= map_dev(major(devid
), minor(devid
), 0);
3767 adev
= content
->text_version
;
3769 fd
= open_dev(mdstat
->devnm
);
3771 pr_err("Device %s cannot be opened for reshape.\n",
3776 if (strcmp(last_devnm
, mdstat
->devnm
) == 0) {
3777 /* Do not allow for multiple reshape_array() calls for
3779 * It can happen when reshape_array() returns without
3780 * error, when reshape is not finished (wrong reshape
3781 * starting/continuation conditions). Mdmon doesn't
3782 * switch to next array in container and reentry
3783 * conditions for the same array occur.
3784 * This is possibly interim until the behaviour of
3785 * reshape_array is resolved().
3787 printf("%s: Multiple reshape execution detected for device %s.\n", Name
, adev
);
3791 strcpy(last_devnm
, mdstat
->devnm
);
3793 if (sysfs_init(content
, fd
, mdstat
->devnm
)) {
3794 pr_err("Unable to initialize sysfs for %s\n",
3800 if (mdmon_running(container
))
3801 flush_mdmon(container
);
3803 rv
= reshape_array(container
, fd
, adev
, st
,
3804 content
, force
, NULL
, INVALID_SECTORS
,
3805 backup_file
, verbose
, 1, restart
,
3809 if (freeze_reshape
) {
3818 if (mdmon_running(container
))
3819 flush_mdmon(container
);
3828 * We run a child process in the background which performs the following
3830 * - wait for resync to reach a certain point
3831 * - suspend io to the following section
3832 * - backup that section
3833 * - allow resync to proceed further
3835 * - discard the backup.
3837 * When are combined in slightly different ways in the three cases.
3839 * - suspend/backup/allow/wait/resume/discard
3841 * - allow/wait/suspend/backup/allow/wait/resume/discard
3843 * - wait/resume/discard/suspend/backup/allow
3845 * suspend/backup/allow always come together
3846 * wait/resume/discard do too.
3847 * For the same-size case we have two backups to improve flow.
3851 int progress_reshape(struct mdinfo
*info
, struct reshape
*reshape
,
3852 unsigned long long backup_point
,
3853 unsigned long long wait_point
,
3854 unsigned long long *suspend_point
,
3855 unsigned long long *reshape_completed
, int *frozen
)
3857 /* This function is called repeatedly by the reshape manager.
3858 * It determines how much progress can safely be made and allows
3860 * - 'info' identifies the array and particularly records in
3861 * ->reshape_progress the metadata's knowledge of progress
3862 * This is a sector offset from the start of the array
3863 * of the next array block to be relocated. This number
3864 * may increase from 0 or decrease from array_size, depending
3865 * on the type of reshape that is happening.
3866 * Note that in contrast, 'sync_completed' is a block count of the
3867 * reshape so far. It gives the distance between the start point
3868 * (head or tail of device) and the next place that data will be
3869 * written. It always increases.
3870 * - 'reshape' is the structure created by analyse_change
3871 * - 'backup_point' shows how much the metadata manager has backed-up
3872 * data. For reshapes with increasing progress, it is the next address
3873 * to be backed up, previous addresses have been backed-up. For
3874 * decreasing progress, it is the earliest address that has been
3875 * backed up - later address are also backed up.
3876 * So addresses between reshape_progress and backup_point are
3877 * backed up providing those are in the 'correct' order.
3878 * - 'wait_point' is an array address. When reshape_completed
3879 * passes this point, progress_reshape should return. It might
3880 * return earlier if it determines that ->reshape_progress needs
3881 * to be updated or further backup is needed.
3882 * - suspend_point is maintained by progress_reshape and the caller
3883 * should not touch it except to initialise to zero.
3884 * It is an array address and it only increases in 2.6.37 and earlier.
3885 * This makes it difficult to handle reducing reshapes with
3886 * external metadata.
3887 * However: it is similar to backup_point in that it records the
3888 * other end of a suspended region from reshape_progress.
3889 * it is moved to extend the region that is safe to backup and/or
3891 * - reshape_completed is read from sysfs and returned. The caller
3892 * should copy this into ->reshape_progress when it has reason to
3893 * believe that the metadata knows this, and any backup outside this
3897 * 1 if more data from backup_point - but only as far as suspend_point,
3898 * should be backed up
3899 * 0 if things are progressing smoothly
3900 * -1 if the reshape is finished because it is all done,
3901 * -2 if the reshape is finished due to an error.
3904 int advancing
= (reshape
->after
.data_disks
3905 >= reshape
->before
.data_disks
);
3906 unsigned long long need_backup
; /* All data between start of array and
3907 * here will at some point need to
3910 unsigned long long read_offset
, write_offset
;
3911 unsigned long long write_range
;
3912 unsigned long long max_progress
, target
, completed
;
3913 unsigned long long array_size
= (info
->component_size
3914 * reshape
->before
.data_disks
);
3918 /* First, we unsuspend any region that is now known to be safe.
3919 * If suspend_point is on the 'wrong' side of reshape_progress, then
3920 * we don't have or need suspension at the moment. This is true for
3921 * native metadata when we don't need to back-up.
3924 if (info
->reshape_progress
<= *suspend_point
)
3925 sysfs_set_num(info
, NULL
, "suspend_lo",
3926 info
->reshape_progress
);
3928 /* Note: this won't work in 2.6.37 and before.
3929 * Something somewhere should make sure we don't need it!
3931 if (info
->reshape_progress
>= *suspend_point
)
3932 sysfs_set_num(info
, NULL
, "suspend_hi",
3933 info
->reshape_progress
);
3936 /* Now work out how far it is safe to progress.
3937 * If the read_offset for ->reshape_progress is less than
3938 * 'blocks' beyond the write_offset, we can only progress as far
3940 * Otherwise we can progress until the write_offset for the new location
3941 * reaches (within 'blocks' of) the read_offset at the current location.
3942 * However that region must be suspended unless we are using native
3944 * If we need to suspend more, we limit it to 128M per device, which is
3945 * rather arbitrary and should be some time-based calculation.
3947 read_offset
= info
->reshape_progress
/ reshape
->before
.data_disks
;
3948 write_offset
= info
->reshape_progress
/ reshape
->after
.data_disks
;
3949 write_range
= info
->new_chunk
/512;
3950 if (reshape
->before
.data_disks
== reshape
->after
.data_disks
)
3951 need_backup
= array_size
;
3953 need_backup
= reshape
->backup_blocks
;
3955 if (read_offset
< write_offset
+ write_range
)
3956 max_progress
= backup_point
;
3959 read_offset
* reshape
->after
.data_disks
;
3961 if (read_offset
> write_offset
- write_range
)
3962 /* Can only progress as far as has been backed up,
3963 * which must be suspended */
3964 max_progress
= backup_point
;
3965 else if (info
->reshape_progress
<= need_backup
)
3966 max_progress
= backup_point
;
3968 if (info
->array
.major_version
>= 0)
3969 /* Can progress until backup is needed */
3970 max_progress
= need_backup
;
3972 /* Can progress until metadata update is required */
3974 read_offset
* reshape
->after
.data_disks
;
3975 /* but data must be suspended */
3976 if (max_progress
< *suspend_point
)
3977 max_progress
= *suspend_point
;
3982 /* We know it is safe to progress to 'max_progress' providing
3983 * it is suspended or we are using native metadata.
3984 * Consider extending suspend_point 128M per device if it
3985 * is less than 64M per device beyond reshape_progress.
3986 * But always do a multiple of 'blocks'
3987 * FIXME this is too big - it takes to long to complete
3990 target
= 64*1024*2 * min(reshape
->before
.data_disks
,
3991 reshape
->after
.data_disks
);
3992 target
/= reshape
->backup_blocks
;
3995 target
*= reshape
->backup_blocks
;
3997 /* For externally managed metadata we always need to suspend IO to
3998 * the area being reshaped so we regularly push suspend_point forward.
3999 * For native metadata we only need the suspend if we are going to do
4003 if ((need_backup
> info
->reshape_progress
||
4004 info
->array
.major_version
< 0) &&
4005 *suspend_point
< info
->reshape_progress
+ target
) {
4006 if (need_backup
< *suspend_point
+ 2 * target
)
4007 *suspend_point
= need_backup
;
4008 else if (*suspend_point
+ 2 * target
< array_size
)
4009 *suspend_point
+= 2 * target
;
4011 *suspend_point
= array_size
;
4012 sysfs_set_num(info
, NULL
, "suspend_hi", *suspend_point
);
4013 if (max_progress
> *suspend_point
)
4014 max_progress
= *suspend_point
;
4017 if (info
->array
.major_version
>= 0) {
4018 /* Only need to suspend when about to backup */
4019 if (info
->reshape_progress
< need_backup
* 2 &&
4020 *suspend_point
> 0) {
4022 sysfs_set_num(info
, NULL
, "suspend_lo", 0);
4023 sysfs_set_num(info
, NULL
, "suspend_hi",
4027 /* Need to suspend continually */
4028 if (info
->reshape_progress
< *suspend_point
)
4029 *suspend_point
= info
->reshape_progress
;
4030 if (*suspend_point
+ target
< info
->reshape_progress
)
4031 /* No need to move suspend region yet */;
4033 if (*suspend_point
>= 2 * target
)
4034 *suspend_point
-= 2 * target
;
4037 sysfs_set_num(info
, NULL
, "suspend_lo",
4040 if (max_progress
< *suspend_point
)
4041 max_progress
= *suspend_point
;
4045 /* now set sync_max to allow that progress. sync_max, like
4046 * sync_completed is a count of sectors written per device, so
4047 * we find the difference between max_progress and the start point,
4048 * and divide that by after.data_disks to get a sync_max
4050 * At the same time we convert wait_point to a similar number
4051 * for comparing against sync_completed.
4053 /* scale down max_progress to per_disk */
4054 max_progress
/= reshape
->after
.data_disks
;
4056 * Round to chunk size as some kernels give an erroneously
4059 max_progress
/= info
->new_chunk
/512;
4060 max_progress
*= info
->new_chunk
/512;
4061 /* And round to old chunk size as the kernel wants that */
4062 max_progress
/= info
->array
.chunk_size
/512;
4063 max_progress
*= info
->array
.chunk_size
/512;
4064 /* Limit progress to the whole device */
4065 if (max_progress
> info
->component_size
)
4066 max_progress
= info
->component_size
;
4067 wait_point
/= reshape
->after
.data_disks
;
4069 /* switch from 'device offset' to 'processed block count' */
4070 max_progress
= info
->component_size
- max_progress
;
4071 wait_point
= info
->component_size
- wait_point
;
4075 sysfs_set_num(info
, NULL
, "sync_max", max_progress
);
4077 /* Now wait. If we have already reached the point that we were
4078 * asked to wait to, don't wait at all, else wait for any change.
4079 * We need to select on 'sync_completed' as that is the place that
4080 * notifications happen, but we are really interested in
4081 * 'reshape_position'
4083 fd
= sysfs_get_fd(info
, NULL
, "sync_completed");
4085 goto check_progress
;
4087 if (sysfs_fd_get_ll(fd
, &completed
) < 0)
4088 goto check_progress
;
4090 while (completed
< max_progress
&& completed
< wait_point
) {
4091 /* Check that sync_action is still 'reshape' to avoid
4092 * waiting forever on a dead array
4095 if (sysfs_get_str(info
, NULL
, "sync_action", action
, 20) <= 0 ||
4096 strncmp(action
, "reshape", 7) != 0)
4098 /* Some kernels reset 'sync_completed' to zero
4099 * before setting 'sync_action' to 'idle'.
4100 * So we need these extra tests.
4102 if (completed
== 0 && advancing
&&
4103 strncmp(action
, "idle", 4) == 0 &&
4104 info
->reshape_progress
> 0)
4106 if (completed
== 0 && !advancing
&&
4107 strncmp(action
, "idle", 4) == 0 &&
4108 info
->reshape_progress
<
4109 (info
->component_size
* reshape
->after
.data_disks
))
4111 sysfs_wait(fd
, NULL
);
4112 if (sysfs_fd_get_ll(fd
, &completed
) < 0)
4113 goto check_progress
;
4115 /* Some kernels reset 'sync_completed' to zero,
4116 * we need to have real point we are in md.
4117 * So in that case, read 'reshape_position' from sysfs.
4119 if (completed
== 0) {
4120 unsigned long long reshapep
;
4122 if (sysfs_get_str(info
, NULL
, "sync_action", action
, 20) > 0 &&
4123 strncmp(action
, "idle", 4) == 0 &&
4124 sysfs_get_ll(info
, NULL
,
4125 "reshape_position", &reshapep
) == 0)
4126 *reshape_completed
= reshapep
;
4128 /* some kernels can give an incorrectly high
4129 * 'completed' number, so round down */
4130 completed
/= (info
->new_chunk
/512);
4131 completed
*= (info
->new_chunk
/512);
4132 /* Convert 'completed' back in to a 'progress' number */
4133 completed
*= reshape
->after
.data_disks
;
4135 completed
= (info
->component_size
4136 * reshape
->after
.data_disks
4138 *reshape_completed
= completed
;
4143 /* We return the need_backup flag. Caller will decide
4144 * how much - a multiple of ->backup_blocks up to *suspend_point
4147 return need_backup
> info
->reshape_progress
;
4149 return need_backup
>= info
->reshape_progress
;
4152 /* if we couldn't read a number from sync_completed, then
4153 * either the reshape did complete, or it aborted.
4154 * We can tell which by checking for 'none' in reshape_position.
4155 * If it did abort, then it might immediately restart if it
4156 * it was just a device failure that leaves us degraded but
4159 if (sysfs_get_str(info
, NULL
, "reshape_position", buf
,
4160 sizeof(buf
)) < 0 || strncmp(buf
, "none", 4) != 0) {
4161 /* The abort might only be temporary. Wait up to 10
4162 * seconds for fd to contain a valid number again.
4166 unsigned long long new_sync_max
;
4167 while (fd
>= 0 && rv
< 0 && wait
> 0) {
4168 if (sysfs_wait(fd
, &wait
) != 1)
4170 switch (sysfs_fd_get_ll(fd
, &completed
)) {
4172 /* all good again */
4174 /* If "sync_max" is no longer max_progress
4175 * we need to freeze things
4177 sysfs_get_ll(info
, NULL
, "sync_max",
4179 *frozen
= (new_sync_max
!= max_progress
);
4181 case -2: /* read error - abort */
4188 return rv
; /* abort */
4190 /* Maybe racing with array shutdown - check state */
4193 if (sysfs_get_str(info
, NULL
, "array_state", buf
,
4195 strncmp(buf
, "inactive", 8) == 0 ||
4196 strncmp(buf
, "clear",5) == 0)
4197 return -2; /* abort */
4198 return -1; /* complete */
4202 /* FIXME return status is never checked */
4203 static int grow_backup(struct mdinfo
*sra
,
4204 unsigned long long offset
, /* per device */
4205 unsigned long stripes
, /* per device, in old chunks */
4206 int *sources
, unsigned long long *offsets
,
4207 int disks
, int chunk
, int level
, int layout
,
4208 int dests
, int *destfd
, unsigned long long *destoffsets
,
4209 int part
, int *degraded
,
4212 /* Backup 'blocks' sectors at 'offset' on each device of the array,
4213 * to storage 'destfd' (offset 'destoffsets'), after first
4214 * suspending IO. Then allow resync to continue
4215 * over the suspended section.
4216 * Use part 'part' of the backup-super-block.
4221 unsigned long long ll
;
4223 //printf("offset %llu\n", offset);
4229 /* Check that array hasn't become degraded, else we might backup the wrong data */
4230 if (sysfs_get_ll(sra
, NULL
, "degraded", &ll
) < 0)
4231 return -1; /* FIXME this error is ignored */
4232 new_degraded
= (int)ll
;
4233 if (new_degraded
!= *degraded
) {
4234 /* check each device to ensure it is still working */
4236 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
4237 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
4239 if (sd
->disk
.state
& (1<<MD_DISK_SYNC
)) {
4242 if (sysfs_get_str(sra
, sd
, "state",
4243 sbuf
, sizeof(sbuf
)) < 0 ||
4244 strstr(sbuf
, "faulty") ||
4245 strstr(sbuf
, "in_sync") == NULL
) {
4246 /* this device is dead */
4247 sd
->disk
.state
= (1<<MD_DISK_FAULTY
);
4248 if (sd
->disk
.raid_disk
>= 0 &&
4249 sources
[sd
->disk
.raid_disk
] >= 0) {
4250 close(sources
[sd
->disk
.raid_disk
]);
4251 sources
[sd
->disk
.raid_disk
] = -1;
4256 *degraded
= new_degraded
;
4259 bsb
.arraystart2
= __cpu_to_le64(offset
* odata
);
4260 bsb
.length2
= __cpu_to_le64(stripes
* (chunk
/512) * odata
);
4262 bsb
.arraystart
= __cpu_to_le64(offset
* odata
);
4263 bsb
.length
= __cpu_to_le64(stripes
* (chunk
/512) * odata
);
4266 bsb
.magic
[15] = '2';
4267 for (i
= 0; i
< dests
; i
++)
4269 lseek64(destfd
[i
], destoffsets
[i
] +
4270 __le64_to_cpu(bsb
.devstart2
)*512, 0);
4272 lseek64(destfd
[i
], destoffsets
[i
], 0);
4274 rv
= save_stripes(sources
, offsets
, disks
, chunk
, level
, layout
,
4275 dests
, destfd
, offset
* 512 * odata
,
4276 stripes
* chunk
* odata
, buf
);
4280 bsb
.mtime
= __cpu_to_le64(time(0));
4281 for (i
= 0; i
< dests
; i
++) {
4282 bsb
.devstart
= __cpu_to_le64(destoffsets
[i
]/512);
4284 bsb
.sb_csum
= bsb_csum((char*)&bsb
,
4285 ((char*)&bsb
.sb_csum
)-((char*)&bsb
));
4286 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0)
4287 bsb
.sb_csum2
= bsb_csum((char*)&bsb
,
4288 ((char*)&bsb
.sb_csum2
)-((char*)&bsb
));
4291 if ((unsigned long long)lseek64(destfd
[i
],
4292 destoffsets
[i
] - 4096, 0) !=
4293 destoffsets
[i
] - 4096)
4295 if (write(destfd
[i
], &bsb
, 512) != 512)
4297 if (destoffsets
[i
] > 4096) {
4298 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
]+stripes
*chunk
*odata
, 0) !=
4299 destoffsets
[i
]+stripes
*chunk
*odata
)
4301 if (write(destfd
[i
], &bsb
, 512) != 512)
4311 /* in 2.6.30, the value reported by sync_completed can be
4312 * less that it should be by one stripe.
4313 * This only happens when reshape hits sync_max and pauses.
4314 * So allow wait_backup to either extent sync_max further
4315 * than strictly necessary, or return before the
4316 * sync has got quite as far as we would really like.
4317 * This is what 'blocks2' is for.
4318 * The various caller give appropriate values so that
4321 /* FIXME return value is often ignored */
4322 static int forget_backup(int dests
, int *destfd
,
4323 unsigned long long *destoffsets
,
4327 * Erase backup 'part' (which is 0 or 1)
4333 bsb
.arraystart2
= __cpu_to_le64(0);
4334 bsb
.length2
= __cpu_to_le64(0);
4336 bsb
.arraystart
= __cpu_to_le64(0);
4337 bsb
.length
= __cpu_to_le64(0);
4339 bsb
.mtime
= __cpu_to_le64(time(0));
4341 for (i
= 0; i
< dests
; i
++) {
4342 bsb
.devstart
= __cpu_to_le64(destoffsets
[i
]/512);
4343 bsb
.sb_csum
= bsb_csum((char*)&bsb
,
4344 ((char*)&bsb
.sb_csum
)-((char*)&bsb
));
4345 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0)
4346 bsb
.sb_csum2
= bsb_csum((char*)&bsb
,
4347 ((char*)&bsb
.sb_csum2
)-((char*)&bsb
));
4348 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
]-4096, 0) !=
4349 destoffsets
[i
]-4096)
4351 if (rv
== 0 && write(destfd
[i
], &bsb
, 512) != 512)
4358 static void fail(char *msg
)
4361 rv
= (write(2, msg
, strlen(msg
)) != (int)strlen(msg
));
4362 rv
|= (write(2, "\n", 1) != 1);
4366 static char *abuf
, *bbuf
;
4367 static unsigned long long abuflen
;
4368 static void validate(int afd
, int bfd
, unsigned long long offset
)
4370 /* check that the data in the backup against the array.
4371 * This is only used for regression testing and should not
4372 * be used while the array is active
4376 lseek64(bfd
, offset
- 4096, 0);
4377 if (read(bfd
, &bsb2
, 512) != 512)
4378 fail("cannot read bsb");
4379 if (bsb2
.sb_csum
!= bsb_csum((char*)&bsb2
,
4380 ((char*)&bsb2
.sb_csum
)-((char*)&bsb2
)))
4381 fail("first csum bad");
4382 if (memcmp(bsb2
.magic
, "md_backup_data", 14) != 0)
4383 fail("magic is bad");
4384 if (memcmp(bsb2
.magic
, "md_backup_data-2", 16) == 0 &&
4385 bsb2
.sb_csum2
!= bsb_csum((char*)&bsb2
,
4386 ((char*)&bsb2
.sb_csum2
)-((char*)&bsb2
)))
4387 fail("second csum bad");
4389 if (__le64_to_cpu(bsb2
.devstart
)*512 != offset
)
4390 fail("devstart is wrong");
4393 unsigned long long len
= __le64_to_cpu(bsb2
.length
)*512;
4395 if (abuflen
< len
) {
4399 if (posix_memalign((void**)&abuf
, 4096, abuflen
) ||
4400 posix_memalign((void**)&bbuf
, 4096, abuflen
)) {
4402 /* just stop validating on mem-alloc failure */
4407 lseek64(bfd
, offset
, 0);
4408 if ((unsigned long long)read(bfd
, bbuf
, len
) != len
) {
4409 //printf("len %llu\n", len);
4410 fail("read first backup failed");
4412 lseek64(afd
, __le64_to_cpu(bsb2
.arraystart
)*512, 0);
4413 if ((unsigned long long)read(afd
, abuf
, len
) != len
)
4414 fail("read first from array failed");
4415 if (memcmp(bbuf
, abuf
, len
) != 0) {
4418 printf("offset=%llu len=%llu\n",
4419 (unsigned long long)__le64_to_cpu(bsb2
.arraystart
)*512, len
);
4420 for (i
=0; i
<len
; i
++)
4421 if (bbuf
[i
] != abuf
[i
]) {
4422 printf("first diff byte %d\n", i
);
4426 fail("data1 compare failed");
4430 unsigned long long len
= __le64_to_cpu(bsb2
.length2
)*512;
4432 if (abuflen
< len
) {
4436 abuf
= xmalloc(abuflen
);
4437 bbuf
= xmalloc(abuflen
);
4440 lseek64(bfd
, offset
+__le64_to_cpu(bsb2
.devstart2
)*512, 0);
4441 if ((unsigned long long)read(bfd
, bbuf
, len
) != len
)
4442 fail("read second backup failed");
4443 lseek64(afd
, __le64_to_cpu(bsb2
.arraystart2
)*512, 0);
4444 if ((unsigned long long)read(afd
, abuf
, len
) != len
)
4445 fail("read second from array failed");
4446 if (memcmp(bbuf
, abuf
, len
) != 0)
4447 fail("data2 compare failed");
4451 int child_monitor(int afd
, struct mdinfo
*sra
, struct reshape
*reshape
,
4452 struct supertype
*st
, unsigned long blocks
,
4453 int *fds
, unsigned long long *offsets
,
4454 int dests
, int *destfd
, unsigned long long *destoffsets
)
4456 /* Monitor a reshape where backup is being performed using
4457 * 'native' mechanism - either to a backup file, or
4458 * to some space in a spare.
4462 unsigned long long speed
;
4463 unsigned long long suspend_point
, array_size
;
4464 unsigned long long backup_point
, wait_point
;
4465 unsigned long long reshape_completed
;
4467 int increasing
= reshape
->after
.data_disks
>=
4468 reshape
->before
.data_disks
;
4469 int part
= 0; /* The next part of the backup area to fill. It
4470 * may already be full, so we need to check */
4471 int level
= reshape
->level
;
4472 int layout
= reshape
->before
.layout
;
4473 int data
= reshape
->before
.data_disks
;
4474 int disks
= reshape
->before
.data_disks
+ reshape
->parity
;
4475 int chunk
= sra
->array
.chunk_size
;
4477 unsigned long stripes
;
4481 /* set up the backup-super-block. This requires the
4482 * uuid from the array.
4484 /* Find a superblock */
4485 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
4489 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
4491 dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 1);
4492 devfd
= dev_open(dn
, O_RDONLY
);
4495 ok
= st
->ss
->load_super(st
, devfd
, NULL
);
4501 pr_err("Cannot find a superblock\n");
4505 memset(&bsb
, 0, 512);
4506 memcpy(bsb
.magic
, "md_backup_data-1", 16);
4507 st
->ss
->uuid_from_super(st
, uuid
);
4508 memcpy(bsb
.set_uuid
, uuid
, 16);
4509 bsb
.mtime
= __cpu_to_le64(time(0));
4510 bsb
.devstart2
= blocks
;
4512 stripes
= blocks
/ (sra
->array
.chunk_size
/512) /
4513 reshape
->before
.data_disks
;
4515 if (posix_memalign((void**)&buf
, 4096, disks
* chunk
))
4516 /* Don't start the 'reshape' */
4518 if (reshape
->before
.data_disks
== reshape
->after
.data_disks
) {
4519 sysfs_get_ll(sra
, NULL
, "sync_speed_min", &speed
);
4520 sysfs_set_num(sra
, NULL
, "sync_speed_min", 200000);
4524 array_size
= sra
->component_size
* reshape
->after
.data_disks
;
4525 backup_point
= sra
->reshape_progress
;
4528 array_size
= sra
->component_size
* reshape
->before
.data_disks
;
4529 backup_point
= reshape
->backup_blocks
;
4530 suspend_point
= array_size
;
4536 /* Want to return as soon the oldest backup slot can
4537 * be released as that allows us to start backing up
4538 * some more, providing suspend_point has been
4539 * advanced, which it should have.
4542 wait_point
= array_size
;
4543 if (part
== 0 && __le64_to_cpu(bsb
.length
) > 0)
4544 wait_point
= (__le64_to_cpu(bsb
.arraystart
) +
4545 __le64_to_cpu(bsb
.length
));
4546 if (part
== 1 && __le64_to_cpu(bsb
.length2
) > 0)
4547 wait_point
= (__le64_to_cpu(bsb
.arraystart2
) +
4548 __le64_to_cpu(bsb
.length2
));
4551 if (part
== 0 && __le64_to_cpu(bsb
.length
) > 0)
4552 wait_point
= __le64_to_cpu(bsb
.arraystart
);
4553 if (part
== 1 && __le64_to_cpu(bsb
.length2
) > 0)
4554 wait_point
= __le64_to_cpu(bsb
.arraystart2
);
4557 reshape_completed
= sra
->reshape_progress
;
4558 rv
= progress_reshape(sra
, reshape
,
4559 backup_point
, wait_point
,
4560 &suspend_point
, &reshape_completed
,
4562 /* external metadata would need to ping_monitor here */
4563 sra
->reshape_progress
= reshape_completed
;
4565 /* Clear any backup region that is before 'here' */
4567 if (__le64_to_cpu(bsb
.length
) > 0 &&
4568 reshape_completed
>= (__le64_to_cpu(bsb
.arraystart
) +
4569 __le64_to_cpu(bsb
.length
)))
4570 forget_backup(dests
, destfd
,
4572 if (__le64_to_cpu(bsb
.length2
) > 0 &&
4573 reshape_completed
>= (__le64_to_cpu(bsb
.arraystart2
) +
4574 __le64_to_cpu(bsb
.length2
)))
4575 forget_backup(dests
, destfd
,
4578 if (__le64_to_cpu(bsb
.length
) > 0 &&
4579 reshape_completed
<= (__le64_to_cpu(bsb
.arraystart
)))
4580 forget_backup(dests
, destfd
,
4582 if (__le64_to_cpu(bsb
.length2
) > 0 &&
4583 reshape_completed
<= (__le64_to_cpu(bsb
.arraystart2
)))
4584 forget_backup(dests
, destfd
,
4594 if (rv
== 0 && increasing
&& !st
->ss
->external
) {
4595 /* No longer need to monitor this reshape */
4596 sysfs_set_str(sra
, NULL
, "sync_max", "max");
4602 unsigned long long offset
;
4603 unsigned long actual_stripes
;
4604 /* Need to backup some data.
4605 * If 'part' is not used and the desired
4606 * backup size is suspended, do a backup,
4607 * then consider the next part.
4609 /* Check that 'part' is unused */
4610 if (part
== 0 && __le64_to_cpu(bsb
.length
) != 0)
4612 if (part
== 1 && __le64_to_cpu(bsb
.length2
) != 0)
4615 offset
= backup_point
/ data
;
4616 actual_stripes
= stripes
;
4618 if (offset
+ actual_stripes
* (chunk
/512) >
4619 sra
->component_size
)
4620 actual_stripes
= ((sra
->component_size
- offset
)
4622 if (offset
+ actual_stripes
* (chunk
/512) >
4626 if (offset
< actual_stripes
* (chunk
/512))
4627 actual_stripes
= offset
/ (chunk
/512);
4628 offset
-= actual_stripes
* (chunk
/512);
4629 if (offset
< suspend_point
/data
)
4632 if (actual_stripes
== 0)
4634 grow_backup(sra
, offset
, actual_stripes
, fds
, offsets
,
4635 disks
, chunk
, level
, layout
, dests
, destfd
,
4636 destoffsets
, part
, °raded
, buf
);
4637 validate(afd
, destfd
[0], destoffsets
[0]);
4638 /* record where 'part' is up to */
4641 backup_point
+= actual_stripes
* (chunk
/512) * data
;
4643 backup_point
-= actual_stripes
* (chunk
/512) * data
;
4647 /* FIXME maybe call progress_reshape one more time instead */
4648 /* remove any remaining suspension */
4649 sysfs_set_num(sra
, NULL
, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL
);
4650 sysfs_set_num(sra
, NULL
, "suspend_hi", 0);
4651 sysfs_set_num(sra
, NULL
, "suspend_lo", 0);
4652 sysfs_set_num(sra
, NULL
, "sync_min", 0);
4654 if (reshape
->before
.data_disks
== reshape
->after
.data_disks
)
4655 sysfs_set_num(sra
, NULL
, "sync_speed_min", speed
);
4661 * If any spare contains md_back_data-1 which is recent wrt mtime,
4662 * write that data into the array and update the super blocks with
4663 * the new reshape_progress
4665 int Grow_restart(struct supertype
*st
, struct mdinfo
*info
, int *fdlist
,
4666 int cnt
, char *backup_file
, int verbose
)
4670 unsigned long long *offsets
;
4671 unsigned long long nstripe
, ostripe
;
4674 odata
= info
->array
.raid_disks
- info
->delta_disks
- 1;
4675 if (info
->array
.level
== 6)
4676 odata
--; /* number of data disks */
4677 ndata
= info
->array
.raid_disks
- 1;
4678 if (info
->new_level
== 6)
4681 old_disks
= info
->array
.raid_disks
- info
->delta_disks
;
4683 if (info
->delta_disks
<= 0)
4684 /* Didn't grow, so the backup file must have
4688 for (i
=old_disks
-(backup_file
?1:0); i
<cnt
; i
++) {
4689 struct mdinfo dinfo
;
4692 char *devname
, namebuf
[20];
4693 unsigned long long lo
, hi
;
4695 /* This was a spare and may have some saved data on it.
4696 * Load the superblock, find and load the
4697 * backup_super_block.
4698 * If either fail, go on to next device.
4699 * If the backup contains no new info, just return
4700 * else restore data and update all superblocks
4702 if (i
== old_disks
-1) {
4703 fd
= open(backup_file
, O_RDONLY
);
4705 pr_err("backup file %s inaccessible: %s\n",
4706 backup_file
, strerror(errno
));
4709 devname
= backup_file
;
4714 if (st
->ss
->load_super(st
, fd
, NULL
))
4717 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
4718 st
->ss
->free_super(st
);
4721 (dinfo
.data_offset
+ dinfo
.component_size
- 8) <<9,
4723 pr_err("Cannot seek on device %d\n", i
);
4724 continue; /* Cannot seek */
4726 sprintf(namebuf
, "device-%d", i
);
4729 if (read(fd
, &bsb
, sizeof(bsb
)) != sizeof(bsb
)) {
4731 pr_err("Cannot read from %s\n", devname
);
4732 continue; /* Cannot read */
4734 if (memcmp(bsb
.magic
, "md_backup_data-1", 16) != 0 &&
4735 memcmp(bsb
.magic
, "md_backup_data-2", 16) != 0) {
4737 pr_err("No backup metadata on %s\n", devname
);
4740 if (bsb
.sb_csum
!= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
))) {
4742 pr_err("Bad backup-metadata checksum on %s\n",
4744 continue; /* bad checksum */
4746 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0 &&
4747 bsb
.sb_csum2
!= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum2
)-((char*)&bsb
))) {
4749 pr_err("Bad backup-metadata checksum2 on %s\n",
4751 continue; /* Bad second checksum */
4753 if (memcmp(bsb
.set_uuid
,info
->uuid
, 16) != 0) {
4755 pr_err("Wrong uuid on backup-metadata on %s\n",
4757 continue; /* Wrong uuid */
4761 * array utime and backup-mtime should be updated at
4762 * much the same time, but it seems that sometimes
4763 * they aren't... So allow considerable flexability in
4764 * matching, and allow this test to be overridden by
4765 * an environment variable.
4767 if(time_after(info
->array
.utime
, (unsigned int)__le64_to_cpu(bsb
.mtime
) + 2*60*60) ||
4768 time_before(info
->array
.utime
, (unsigned int)__le64_to_cpu(bsb
.mtime
) - 10*60)) {
4769 if (check_env("MDADM_GROW_ALLOW_OLD")) {
4770 pr_err("accepting backup with timestamp %lu for array with timestamp %lu\n",
4771 (unsigned long)__le64_to_cpu(bsb
.mtime
),
4772 (unsigned long)info
->array
.utime
);
4774 pr_err("too-old timestamp on backup-metadata on %s\n", devname
);
4775 pr_err("If you think it is should be safe, try 'export MDADM_GROW_ALLOW_OLD=1'\n");
4776 continue; /* time stamp is too bad */
4780 if (bsb
.magic
[15] == '1') {
4781 if (bsb
.length
== 0)
4783 if (info
->delta_disks
>= 0) {
4784 /* reshape_progress is increasing */
4785 if (__le64_to_cpu(bsb
.arraystart
)
4786 + __le64_to_cpu(bsb
.length
)
4787 < info
->reshape_progress
) {
4790 pr_err("backup-metadata found on %s but is not needed\n", devname
);
4791 continue; /* No new data here */
4794 /* reshape_progress is decreasing */
4795 if (__le64_to_cpu(bsb
.arraystart
) >=
4796 info
->reshape_progress
)
4797 goto nonew
; /* No new data here */
4800 if (bsb
.length
== 0 && bsb
.length2
== 0)
4802 if (info
->delta_disks
>= 0) {
4803 /* reshape_progress is increasing */
4804 if ((__le64_to_cpu(bsb
.arraystart
)
4805 + __le64_to_cpu(bsb
.length
)
4806 < info
->reshape_progress
) &&
4807 (__le64_to_cpu(bsb
.arraystart2
)
4808 + __le64_to_cpu(bsb
.length2
)
4809 < info
->reshape_progress
))
4810 goto nonew
; /* No new data here */
4812 /* reshape_progress is decreasing */
4813 if (__le64_to_cpu(bsb
.arraystart
) >=
4814 info
->reshape_progress
&&
4815 __le64_to_cpu(bsb
.arraystart2
) >=
4816 info
->reshape_progress
)
4817 goto nonew
; /* No new data here */
4820 if (lseek64(fd
, __le64_to_cpu(bsb
.devstart
)*512, 0)< 0) {
4823 pr_err("Failed to verify secondary backup-metadata block on %s\n",
4825 continue; /* Cannot seek */
4827 /* There should be a duplicate backup superblock 4k before here */
4828 if (lseek64(fd
, -4096, 1) < 0 ||
4829 read(fd
, &bsb2
, sizeof(bsb2
)) != sizeof(bsb2
))
4830 goto second_fail
; /* Cannot find leading superblock */
4831 if (bsb
.magic
[15] == '1')
4832 bsbsize
= offsetof(struct mdp_backup_super
, pad1
);
4834 bsbsize
= offsetof(struct mdp_backup_super
, pad
);
4835 if (memcmp(&bsb2
, &bsb
, bsbsize
) != 0)
4836 goto second_fail
; /* Cannot find leading superblock */
4838 /* Now need the data offsets for all devices. */
4839 offsets
= xmalloc(sizeof(*offsets
)*info
->array
.raid_disks
);
4840 for(j
=0; j
<info
->array
.raid_disks
; j
++) {
4843 if (st
->ss
->load_super(st
, fdlist
[j
], NULL
))
4844 /* FIXME should be this be an error */
4846 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
4847 st
->ss
->free_super(st
);
4848 offsets
[j
] = dinfo
.data_offset
* 512;
4850 printf("%s: restoring critical section\n", Name
);
4852 if (restore_stripes(fdlist
, offsets
, info
->array
.raid_disks
,
4853 info
->new_chunk
, info
->new_level
,
4854 info
->new_layout
, fd
,
4855 __le64_to_cpu(bsb
.devstart
)*512,
4856 __le64_to_cpu(bsb
.arraystart
)*512,
4857 __le64_to_cpu(bsb
.length
)*512, NULL
)) {
4858 /* didn't succeed, so giveup */
4860 pr_err("Error restoring backup from %s\n",
4866 if (bsb
.magic
[15] == '2' &&
4867 restore_stripes(fdlist
, offsets
, info
->array
.raid_disks
,
4868 info
->new_chunk
, info
->new_level
,
4869 info
->new_layout
, fd
,
4870 __le64_to_cpu(bsb
.devstart
)*512 +
4871 __le64_to_cpu(bsb
.devstart2
)*512,
4872 __le64_to_cpu(bsb
.arraystart2
)*512,
4873 __le64_to_cpu(bsb
.length2
)*512, NULL
)) {
4874 /* didn't succeed, so giveup */
4876 pr_err("Error restoring second backup from %s\n",
4884 /* Ok, so the data is restored. Let's update those superblocks. */
4888 lo
= __le64_to_cpu(bsb
.arraystart
);
4889 hi
= lo
+ __le64_to_cpu(bsb
.length
);
4891 if (bsb
.magic
[15] == '2' && bsb
.length2
) {
4892 unsigned long long lo1
, hi1
;
4893 lo1
= __le64_to_cpu(bsb
.arraystart2
);
4894 hi1
= lo1
+ __le64_to_cpu(bsb
.length2
);
4898 } else if (lo
< lo1
)
4903 if (lo
< hi
&& (info
->reshape_progress
< lo
||
4904 info
->reshape_progress
> hi
))
4905 /* backup does not affect reshape_progress*/ ;
4906 else if (info
->delta_disks
>= 0) {
4907 info
->reshape_progress
= __le64_to_cpu(bsb
.arraystart
) +
4908 __le64_to_cpu(bsb
.length
);
4909 if (bsb
.magic
[15] == '2') {
4910 unsigned long long p2
;
4912 p2
= __le64_to_cpu(bsb
.arraystart2
) +
4913 __le64_to_cpu(bsb
.length2
);
4914 if (p2
> info
->reshape_progress
)
4915 info
->reshape_progress
= p2
;
4918 info
->reshape_progress
= __le64_to_cpu(bsb
.arraystart
);
4919 if (bsb
.magic
[15] == '2') {
4920 unsigned long long p2
;
4922 p2
= __le64_to_cpu(bsb
.arraystart2
);
4923 if (p2
< info
->reshape_progress
)
4924 info
->reshape_progress
= p2
;
4927 for (j
=0; j
<info
->array
.raid_disks
; j
++) {
4930 if (st
->ss
->load_super(st
, fdlist
[j
], NULL
))
4932 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
4933 dinfo
.reshape_progress
= info
->reshape_progress
;
4934 st
->ss
->update_super(st
, &dinfo
, "_reshape_progress",
4936 st
->ss
->store_super(st
, fdlist
[j
]);
4937 st
->ss
->free_super(st
);
4941 /* Didn't find any backup data, try to see if any
4944 if (info
->delta_disks
< 0) {
4945 /* When shrinking, the critical section is at the end.
4946 * So see if we are before the critical section.
4948 unsigned long long first_block
;
4949 nstripe
= ostripe
= 0;
4951 while (ostripe
>= nstripe
) {
4952 ostripe
+= info
->array
.chunk_size
/ 512;
4953 first_block
= ostripe
* odata
;
4954 nstripe
= first_block
/ ndata
/ (info
->new_chunk
/512) *
4955 (info
->new_chunk
/512);
4958 if (info
->reshape_progress
>= first_block
)
4961 if (info
->delta_disks
> 0) {
4962 /* See if we are beyond the critical section. */
4963 unsigned long long last_block
;
4964 nstripe
= ostripe
= 0;
4966 while (nstripe
>= ostripe
) {
4967 nstripe
+= info
->new_chunk
/ 512;
4968 last_block
= nstripe
* ndata
;
4969 ostripe
= last_block
/ odata
/ (info
->array
.chunk_size
/512) *
4970 (info
->array
.chunk_size
/512);
4973 if (info
->reshape_progress
>= last_block
)
4976 /* needed to recover critical section! */
4978 pr_err("Failed to find backup of critical section\n");
4982 int Grow_continue_command(char *devname
, int fd
,
4983 char *backup_file
, int verbose
)
4986 struct supertype
*st
= NULL
;
4987 struct mdinfo
*content
= NULL
;
4988 struct mdinfo array
;
4989 char *subarray
= NULL
;
4990 struct mdinfo
*cc
= NULL
;
4991 struct mdstat_ent
*mdstat
= NULL
;
4995 dprintf("Grow continue from command line called for %s\n", devname
);
4997 st
= super_by_fd(fd
, &subarray
);
4998 if (!st
|| !st
->ss
) {
4999 pr_err("Unable to determine metadata format for %s\n", devname
);
5002 dprintf("Grow continue is run for ");
5003 if (st
->ss
->external
== 0) {
5006 dprintf_cont("native array (%s)\n", devname
);
5007 if (md_get_array_info(fd
, &array
.array
) < 0) {
5008 pr_err("%s is not an active md array - aborting\n",
5011 goto Grow_continue_command_exit
;
5014 sysfs_init(content
, fd
, NULL
);
5015 /* Need to load a superblock.
5016 * FIXME we should really get what we need from
5020 for (d
= 0; d
< MAX_DISKS
; d
++) {
5021 mdu_disk_info_t disk
;
5025 if (md_get_disk_info(fd
, &disk
) < 0)
5027 if (disk
.major
== 0 && disk
.minor
== 0)
5029 if ((disk
.state
& (1 << MD_DISK_ACTIVE
)) == 0)
5031 dv
= map_dev(disk
.major
, disk
.minor
, 1);
5034 fd2
= dev_open(dv
, O_RDONLY
);
5037 err
= st
->ss
->load_super(st
, fd2
, NULL
);
5043 if (d
== MAX_DISKS
) {
5044 pr_err("Unable to load metadata for %s\n",
5047 goto Grow_continue_command_exit
;
5049 st
->ss
->getinfo_super(st
, content
, NULL
);
5050 if (!content
->reshape_active
)
5054 } while (cnt
-- > 0);
5059 dprintf_cont("subarray (%s)\n", subarray
);
5060 container
= st
->container_devnm
;
5061 cfd
= open_dev_excl(st
->container_devnm
);
5063 container
= st
->devnm
;
5065 cfd
= open_dev_excl(st
->devnm
);
5066 dprintf_cont("container (%s)\n", container
);
5070 pr_err("Unable to open container for %s\n", devname
);
5072 goto Grow_continue_command_exit
;
5075 /* find in container array under reshape
5077 ret_val
= st
->ss
->load_container(st
, cfd
, NULL
);
5079 pr_err("Cannot read superblock for %s\n", devname
);
5081 goto Grow_continue_command_exit
;
5084 cc
= st
->ss
->container_content(st
, subarray
);
5085 for (content
= cc
; content
; content
= content
->next
) {
5087 int allow_reshape
= 1;
5089 if (content
->reshape_active
== 0)
5091 /* The decision about array or container wide
5092 * reshape is taken in Grow_continue based
5093 * content->reshape_active state, therefore we
5094 * need to check_reshape based on
5095 * reshape_active and subarray name
5097 if (content
->array
.state
& (1<<MD_SB_BLOCK_VOLUME
))
5099 if (content
->reshape_active
== CONTAINER_RESHAPE
&&
5100 (content
->array
.state
5101 & (1<<MD_SB_BLOCK_CONTAINER_RESHAPE
)))
5104 if (!allow_reshape
) {
5105 pr_err("cannot continue reshape of an array in container with unsupported metadata: %s(%s)\n",
5106 devname
, container
);
5108 goto Grow_continue_command_exit
;
5111 array_name
= strchr(content
->text_version
+1, '/')+1;
5112 mdstat
= mdstat_by_subdev(array_name
, container
);
5115 if (mdstat
->active
== 0) {
5116 pr_err("Skipping inactive array %s.\n",
5118 free_mdstat(mdstat
);
5125 pr_err("Unable to determine reshaped array for %s\n", devname
);
5127 goto Grow_continue_command_exit
;
5129 fd2
= open_dev(mdstat
->devnm
);
5131 pr_err("cannot open (%s)\n", mdstat
->devnm
);
5133 goto Grow_continue_command_exit
;
5136 if (sysfs_init(content
, fd2
, mdstat
->devnm
)) {
5137 pr_err("Unable to initialize sysfs for %s, Grow cannot continue.\n",
5141 goto Grow_continue_command_exit
;
5146 /* start mdmon in case it is not running
5148 if (!mdmon_running(container
))
5149 start_mdmon(container
);
5150 ping_monitor(container
);
5152 if (mdmon_running(container
))
5153 st
->update_tail
= &st
->updates
;
5155 pr_err("No mdmon found. Grow cannot continue.\n");
5157 goto Grow_continue_command_exit
;
5161 /* verify that array under reshape is started from
5164 if (verify_reshape_position(content
, content
->array
.level
) < 0) {
5166 goto Grow_continue_command_exit
;
5171 ret_val
= Grow_continue(fd
, st
, content
, backup_file
, 1, 0);
5173 Grow_continue_command_exit
:
5176 st
->ss
->free_super(st
);
5177 free_mdstat(mdstat
);
5184 int Grow_continue(int mdfd
, struct supertype
*st
, struct mdinfo
*info
,
5185 char *backup_file
, int forked
, int freeze_reshape
)
5189 if (!info
->reshape_active
)
5192 if (st
->ss
->external
) {
5193 int cfd
= open_dev(st
->container_devnm
);
5198 st
->ss
->load_container(st
, cfd
, st
->container_devnm
);
5200 ret_val
= reshape_container(st
->container_devnm
, NULL
, mdfd
,
5201 st
, info
, 0, backup_file
, 0,
5202 forked
, 1 | info
->reshape_active
,
5205 ret_val
= reshape_array(NULL
, mdfd
, "array", st
, info
, 1,
5206 NULL
, INVALID_SECTORS
, backup_file
,
5207 0, forked
, 1 | info
->reshape_active
,
5213 char *make_backup(char *name
)
5215 char *base
= "backup_file-";
5219 len
= strlen(MAP_DIR
) + 1 + strlen(base
) + strlen(name
)+1;
5220 fname
= xmalloc(len
);
5221 sprintf(fname
, "%s/%s%s", MAP_DIR
, base
, name
);
5225 char *locate_backup(char *name
)
5227 char *fl
= make_backup(name
);
5230 if (stat(fl
, &stb
) == 0 && S_ISREG(stb
.st_mode
))