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>
32 #if ! defined(__BIG_ENDIAN) && ! defined(__LITTLE_ENDIAN)
33 #error no endian defined
38 int restore_backup(struct supertype
*st
,
39 struct mdinfo
*content
,
49 int disk_count
= next_spare
+ working_disks
;
50 char *backup_file
= *backup_filep
;
52 dprintf("Called restore_backup()\n");
53 fdlist
= xmalloc(sizeof(int) * disk_count
);
55 enable_fds(next_spare
);
56 for (i
= 0; i
< next_spare
; i
++)
58 for (dev
= content
->devs
; dev
; dev
= dev
->next
) {
64 fd
= dev_open(buf
, O_RDWR
);
66 if (dev
->disk
.raid_disk
>= 0)
67 fdlist
[dev
->disk
.raid_disk
] = fd
;
69 fdlist
[next_spare
++] = fd
;
73 backup_file
= locate_backup(content
->sys_name
);
74 *backup_filep
= backup_file
;
77 if (st
->ss
->external
&& st
->ss
->recover_backup
)
78 err
= st
->ss
->recover_backup(st
, content
);
80 err
= Grow_restart(st
, content
, fdlist
, next_spare
,
81 backup_file
, verbose
> 0);
83 while (next_spare
> 0) {
85 if (fdlist
[next_spare
] >= 0)
86 close(fdlist
[next_spare
]);
90 pr_err("Failed to restore critical section for reshape - sorry.\n");
92 pr_err("Possibly you need to specify a --backup-file\n");
96 dprintf("restore_backup() returns status OK.\n");
100 int Grow_Add_device(char *devname
, int fd
, char *newdev
)
102 /* Add a device to an active array.
103 * Currently, just extend a linear array.
104 * This requires writing a new superblock on the
105 * new device, calling the kernel to add the device,
106 * and if that succeeds, update the superblock on
108 * This means that we need to *find* all other devices.
115 struct supertype
*st
= NULL
;
116 char *subarray
= NULL
;
118 if (ioctl(fd
, GET_ARRAY_INFO
, &info
.array
) < 0) {
119 pr_err("cannot get array info for %s\n", devname
);
123 if (info
.array
.level
!= -1) {
124 pr_err("can only add devices to linear arrays\n");
128 st
= super_by_fd(fd
, &subarray
);
130 pr_err("cannot handle arrays with superblock version %d\n",
131 info
.array
.major_version
);
136 pr_err("Cannot grow linear sub-arrays yet\n");
142 nfd
= open(newdev
, O_RDWR
|O_EXCL
|O_DIRECT
);
144 pr_err("cannot open %s\n", newdev
);
149 if ((stb
.st_mode
& S_IFMT
) != S_IFBLK
) {
150 pr_err("%s is not a block device!\n", newdev
);
155 /* now check out all the devices and make sure we can read the
157 for (d
=0 ; d
< info
.array
.raid_disks
; d
++) {
158 mdu_disk_info_t disk
;
161 st
->ss
->free_super(st
);
164 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0) {
165 pr_err("cannot get device detail for device %d\n",
171 dv
= map_dev(disk
.major
, disk
.minor
, 1);
173 pr_err("cannot find device file for device %d\n",
179 fd2
= dev_open(dv
, O_RDWR
);
181 pr_err("cannot open device file %s\n", dv
);
187 if (st
->ss
->load_super(st
, fd2
, NULL
)) {
188 pr_err("cannot find super block on %s\n", dv
);
196 /* Ok, looks good. Lets update the superblock and write it out to
200 info
.disk
.number
= d
;
201 info
.disk
.major
= major(stb
.st_rdev
);
202 info
.disk
.minor
= minor(stb
.st_rdev
);
203 info
.disk
.raid_disk
= d
;
204 info
.disk
.state
= (1 << MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
);
205 st
->ss
->update_super(st
, &info
, "linear-grow-new", newdev
,
208 if (st
->ss
->store_super(st
, nfd
)) {
209 pr_err("Cannot store new superblock on %s\n",
216 if (ioctl(fd
, ADD_NEW_DISK
, &info
.disk
) != 0) {
217 pr_err("Cannot add new disk to this array\n");
220 /* Well, that seems to have worked.
221 * Now go through and update all superblocks
224 if (ioctl(fd
, GET_ARRAY_INFO
, &info
.array
) < 0) {
225 pr_err("cannot get array info for %s\n", devname
);
230 for (d
=0 ; d
< info
.array
.raid_disks
; d
++) {
231 mdu_disk_info_t disk
;
235 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0) {
236 pr_err("cannot get device detail for device %d\n",
240 dv
= map_dev(disk
.major
, disk
.minor
, 1);
242 pr_err("cannot find device file for device %d\n",
246 fd2
= dev_open(dv
, O_RDWR
);
248 pr_err("cannot open device file %s\n", dv
);
251 if (st
->ss
->load_super(st
, fd2
, NULL
)) {
252 pr_err("cannot find super block on %s\n", dv
);
256 info
.array
.raid_disks
= nd
+1;
257 info
.array
.nr_disks
= nd
+1;
258 info
.array
.active_disks
= nd
+1;
259 info
.array
.working_disks
= nd
+1;
261 st
->ss
->update_super(st
, &info
, "linear-grow-update", 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 int vers
= md_get_version(fd
);
292 unsigned long long bitmapsize
, array_size
;
295 major
= BITMAP_MAJOR_HOSTENDIAN
;
296 pr_err("Warning - bitmaps created on this kernel are not portable\n"
297 " between different architectures. Consider upgrading the Linux kernel.\n");
301 * We only ever get called if s->bitmap_file is != NULL, so this check
302 * is just here to quiet down static code checkers.
307 if (strcmp(s
->bitmap_file
, "clustered") == 0)
308 major
= BITMAP_MAJOR_CLUSTERED
;
310 if (ioctl(fd
, GET_BITMAP_FILE
, &bmf
) != 0) {
312 pr_err("Memory allocation failure.\n");
314 pr_err("bitmaps not supported by this kernel.\n");
317 if (bmf
.pathname
[0]) {
318 if (strcmp(s
->bitmap_file
,"none") == 0) {
319 if (ioctl(fd
, SET_BITMAP_FILE
, -1) != 0) {
320 pr_err("failed to remove bitmap %s\n",
326 pr_err("%s already has a bitmap (%s)\n",
327 devname
, bmf
.pathname
);
330 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) != 0) {
331 pr_err("cannot get array status for %s\n", devname
);
334 if (array
.state
& (1 << MD_SB_BITMAP_PRESENT
)) {
335 if (strcmp(s
->bitmap_file
, "none")==0) {
336 array
.state
&= ~(1 << MD_SB_BITMAP_PRESENT
);
337 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
338 if (array
.state
& (1 << MD_SB_CLUSTERED
))
339 pr_err("failed to remove clustered bitmap.\n");
341 pr_err("failed to remove internal bitmap.\n");
346 pr_err("bitmap already present on %s\n", devname
);
350 if (strcmp(s
->bitmap_file
, "none") == 0) {
351 pr_err("no bitmap found on %s\n", devname
);
354 if (array
.level
<= 0) {
355 pr_err("Bitmaps not meaningful with level %s\n",
356 map_num(pers
, array
.level
)?:"of this array");
359 bitmapsize
= array
.size
;
361 if (get_dev_size(fd
, NULL
, &array_size
) &&
362 array_size
> (0x7fffffffULL
<< 9)) {
363 /* Array is big enough that we cannot trust array.size
364 * try other approaches
366 bitmapsize
= get_component_size(fd
);
368 if (bitmapsize
== 0) {
369 pr_err("Cannot reliably determine size of array to create bitmap - sorry.\n");
373 if (array
.level
== 10) {
376 ncopies
= (array
.layout
& 255) * ((array
.layout
>> 8) & 255);
377 bitmapsize
= bitmapsize
* array
.raid_disks
/ ncopies
;
380 st
= super_by_fd(fd
, &subarray
);
382 pr_err("Cannot understand version %d.%d\n",
383 array
.major_version
, array
.minor_version
);
387 pr_err("Cannot add bitmaps to sub-arrays yet\n");
392 if (strcmp(s
->bitmap_file
, "internal") == 0 ||
393 strcmp(s
->bitmap_file
, "clustered") == 0) {
396 int offset_setable
= 0;
398 if (st
->ss
->add_internal_bitmap
== NULL
) {
399 pr_err("Internal bitmaps not supported with %s metadata\n", st
->ss
->name
);
402 st
->nodes
= c
->nodes
;
403 st
->cluster_name
= c
->homecluster
;
404 mdi
= sysfs_read(fd
, NULL
, GET_BITMAP_LOCATION
);
407 for (d
= 0; d
< st
->max_devs
; d
++) {
408 mdu_disk_info_t disk
;
413 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
415 if (disk
.major
== 0 && disk
.minor
== 0)
417 if ((disk
.state
& (1 << MD_DISK_SYNC
)) == 0)
419 dv
= map_dev(disk
.major
, disk
.minor
, 1);
422 fd2
= dev_open(dv
, O_RDWR
);
425 rv
= st
->ss
->load_super(st
, fd2
, NULL
);
427 rv
= st
->ss
->add_internal_bitmap(
428 st
, &s
->bitmap_chunk
, c
->delay
,
429 s
->write_behind
, bitmapsize
,
430 offset_setable
, major
);
432 st
->ss
->write_bitmap(st
, fd2
,
435 pr_err("failed to create internal bitmap - chunksize problem.\n");
438 pr_err("failed to load super-block.\n");
444 if (offset_setable
) {
445 st
->ss
->getinfo_super(st
, mdi
, NULL
);
446 sysfs_init(mdi
, fd
, NULL
);
447 rv
= sysfs_set_num_signed(mdi
, NULL
, "bitmap/location",
450 if (strcmp(s
->bitmap_file
, "clustered") == 0)
451 array
.state
|= (1 << MD_SB_CLUSTERED
);
452 array
.state
|= (1 << MD_SB_BITMAP_PRESENT
);
453 rv
= ioctl(fd
, SET_ARRAY_INFO
, &array
);
457 pr_err("Cannot add bitmap while array is resyncing or reshaping etc.\n");
458 pr_err("failed to set internal bitmap.\n");
465 int max_devs
= st
->max_devs
;
467 /* try to load a superblock */
468 for (d
= 0; d
< max_devs
; d
++) {
469 mdu_disk_info_t disk
;
473 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
475 if ((disk
.major
==0 && disk
.minor
== 0) ||
476 (disk
.state
& (1 << MD_DISK_REMOVED
)))
478 dv
= map_dev(disk
.major
, disk
.minor
, 1);
481 fd2
= dev_open(dv
, O_RDONLY
);
483 if (st
->ss
->load_super(st
, fd2
, NULL
) == 0) {
485 st
->ss
->uuid_from_super(st
, uuid
);
492 pr_err("cannot find UUID for array!\n");
495 if (CreateBitmap(s
->bitmap_file
, c
->force
, (char*)uuid
,
496 s
->bitmap_chunk
, c
->delay
, s
->write_behind
,
497 bitmapsize
, major
)) {
500 bitmap_fd
= open(s
->bitmap_file
, O_RDWR
);
502 pr_err("weird: %s cannot be opened\n", s
->bitmap_file
);
505 if (ioctl(fd
, SET_BITMAP_FILE
, bitmap_fd
) < 0) {
508 pr_err("Cannot add bitmap while array is resyncing or reshaping etc.\n");
509 pr_err("Cannot set bitmap file for %s: %s\n",
510 devname
, strerror(err
));
519 * When reshaping an array we might need to backup some data.
520 * This is written to all spares with a 'super_block' describing it.
521 * The superblock goes 4K from the end of the used space on the
523 * It if written after the backup is complete.
524 * It has the following structure.
527 static struct mdp_backup_super
{
528 char magic
[16]; /* md_backup_data-1 or -2 */
531 /* start/sizes in 512byte sectors */
532 __u64 devstart
; /* address on backup device/file of data */
535 __u32 sb_csum
; /* csum of preceeding bytes. */
537 __u64 devstart2
; /* offset in to data of second section */
540 __u32 sb_csum2
; /* csum of preceeding bytes. */
542 } __attribute__((aligned(512))) bsb
, bsb2
;
544 static __u32
bsb_csum(char *buf
, int len
)
548 for (i
= 0; i
< len
; i
++)
549 csum
= (csum
<<3) + buf
[0];
550 return __cpu_to_le32(csum
);
553 static int check_idle(struct supertype
*st
)
555 /* Check that all member arrays for this container, or the
556 * container of this array, are idle
558 char *container
= (st
->container_devnm
[0]
559 ? st
->container_devnm
: st
->devnm
);
560 struct mdstat_ent
*ent
, *e
;
563 ent
= mdstat_read(0, 0);
564 for (e
= ent
; e
; e
= e
->next
) {
565 if (!is_container_member(e
, container
))
567 if (e
->percent
>= 0) {
576 static int freeze_container(struct supertype
*st
)
578 char *container
= (st
->container_devnm
[0]
579 ? st
->container_devnm
: st
->devnm
);
584 if (block_monitor(container
, 1)) {
585 pr_err("failed to freeze container\n");
592 static void unfreeze_container(struct supertype
*st
)
594 char *container
= (st
->container_devnm
[0]
595 ? st
->container_devnm
: st
->devnm
);
597 unblock_monitor(container
, 1);
600 static int freeze(struct supertype
*st
)
602 /* Try to freeze resync/rebuild on this array/container.
603 * Return -1 if the array is busy,
604 * return -2 container cannot be frozen,
605 * return 0 if this kernel doesn't support 'frozen'
606 * return 1 if it worked.
608 if (st
->ss
->external
)
609 return freeze_container(st
);
611 struct mdinfo
*sra
= sysfs_read(-1, st
->devnm
, GET_VERSION
);
617 /* Need to clear any 'read-auto' status */
618 if (sysfs_get_str(sra
, NULL
, "array_state", buf
, 20) > 0 &&
619 strncmp(buf
, "read-auto", 9) == 0)
620 sysfs_set_str(sra
, NULL
, "array_state", "clean");
622 err
= sysfs_freeze_array(sra
);
628 static void unfreeze(struct supertype
*st
)
630 if (st
->ss
->external
)
631 return unfreeze_container(st
);
633 struct mdinfo
*sra
= sysfs_read(-1, st
->devnm
, GET_VERSION
);
637 sysfs_get_str(sra
, NULL
, "sync_action", buf
, 20) > 0
638 && strcmp(buf
, "frozen\n") == 0)
639 sysfs_set_str(sra
, NULL
, "sync_action", "idle");
644 static void wait_reshape(struct mdinfo
*sra
)
646 int fd
= sysfs_get_fd(sra
, NULL
, "sync_action");
652 while (sysfs_fd_get_str(fd
, action
, 20) > 0 &&
653 strncmp(action
, "reshape", 7) == 0)
654 sysfs_wait(fd
, NULL
);
658 static int reshape_super(struct supertype
*st
, unsigned long long size
,
659 int level
, int layout
, int chunksize
, int raid_disks
,
660 int delta_disks
, char *backup_file
, char *dev
,
661 int direction
, int verbose
)
663 /* nothing extra to check in the native case */
664 if (!st
->ss
->external
)
666 if (!st
->ss
->reshape_super
||
667 !st
->ss
->manage_reshape
) {
668 pr_err("%s metadata does not support reshape\n",
673 return st
->ss
->reshape_super(st
, size
, level
, layout
, chunksize
,
674 raid_disks
, delta_disks
, backup_file
, dev
,
678 static void sync_metadata(struct supertype
*st
)
680 if (st
->ss
->external
) {
681 if (st
->update_tail
) {
682 flush_metadata_updates(st
);
683 st
->update_tail
= &st
->updates
;
685 st
->ss
->sync_metadata(st
);
689 static int subarray_set_num(char *container
, struct mdinfo
*sra
, char *name
, int n
)
691 /* when dealing with external metadata subarrays we need to be
692 * prepared to handle EAGAIN. The kernel may need to wait for
693 * mdmon to mark the array active so the kernel can handle
694 * allocations/writeback when preparing the reshape action
695 * (md_allow_write()). We temporarily disable safe_mode_delay
696 * to close a race with the array_state going clean before the
697 * next write to raid_disks / stripe_cache_size
702 /* only 'raid_disks' and 'stripe_cache_size' trigger md_allow_write */
704 (strcmp(name
, "raid_disks") != 0 &&
705 strcmp(name
, "stripe_cache_size") != 0))
706 return sysfs_set_num(sra
, NULL
, name
, n
);
708 rc
= sysfs_get_str(sra
, NULL
, "safe_mode_delay", safe
, sizeof(safe
));
711 sysfs_set_num(sra
, NULL
, "safe_mode_delay", 0);
712 rc
= sysfs_set_num(sra
, NULL
, name
, n
);
713 if (rc
< 0 && errno
== EAGAIN
) {
714 ping_monitor(container
);
715 /* if we get EAGAIN here then the monitor is not active
718 rc
= sysfs_set_num(sra
, NULL
, name
, n
);
720 sysfs_set_str(sra
, NULL
, "safe_mode_delay", safe
);
724 int start_reshape(struct mdinfo
*sra
, int already_running
,
725 int before_data_disks
, int data_disks
)
728 unsigned long long sync_max_to_set
;
730 sysfs_set_num(sra
, NULL
, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL
);
731 err
= sysfs_set_num(sra
, NULL
, "suspend_hi", sra
->reshape_progress
);
732 err
= err
?: sysfs_set_num(sra
, NULL
, "suspend_lo",
733 sra
->reshape_progress
);
734 if (before_data_disks
<= data_disks
)
735 sync_max_to_set
= sra
->reshape_progress
/ data_disks
;
737 sync_max_to_set
= (sra
->component_size
* data_disks
738 - sra
->reshape_progress
) / data_disks
;
739 if (!already_running
)
740 sysfs_set_num(sra
, NULL
, "sync_min", sync_max_to_set
);
741 err
= err
?: sysfs_set_num(sra
, NULL
, "sync_max", sync_max_to_set
);
742 if (!already_running
&& err
== 0) {
745 err
= sysfs_set_str(sra
, NULL
, "sync_action", "reshape");
748 } while (err
&& errno
== EBUSY
&& cnt
-- > 0);
753 void abort_reshape(struct mdinfo
*sra
)
755 sysfs_set_str(sra
, NULL
, "sync_action", "idle");
757 * Prior to kernel commit: 23ddff3792f6 ("md: allow suspend_lo and
758 * suspend_hi to decrease as well as increase.")
759 * you could only increase suspend_{lo,hi} unless the region they
760 * covered was empty. So to reset to 0, you need to push suspend_lo
761 * up past suspend_hi first. So to maximize the chance of mdadm
762 * working on all kernels, we want to keep doing that.
764 sysfs_set_num(sra
, NULL
, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL
);
765 sysfs_set_num(sra
, NULL
, "suspend_hi", 0);
766 sysfs_set_num(sra
, NULL
, "suspend_lo", 0);
767 sysfs_set_num(sra
, NULL
, "sync_min", 0);
768 // It isn't safe to reset sync_max as we aren't monitoring.
769 // Array really should be stopped at this point.
772 int remove_disks_for_takeover(struct supertype
*st
,
777 struct mdinfo
*remaining
;
780 if (sra
->array
.level
== 10)
781 nr_of_copies
= layout
& 0xff;
782 else if (sra
->array
.level
== 1)
783 nr_of_copies
= sra
->array
.raid_disks
;
787 remaining
= sra
->devs
;
789 /* for each 'copy', select one device and remove from the list. */
790 for (slot
= 0; slot
< sra
->array
.raid_disks
; slot
+= nr_of_copies
) {
791 struct mdinfo
**diskp
;
794 /* Find a working device to keep */
795 for (diskp
= &remaining
; *diskp
; diskp
= &(*diskp
)->next
) {
796 struct mdinfo
*disk
= *diskp
;
798 if (disk
->disk
.raid_disk
< slot
)
800 if (disk
->disk
.raid_disk
>= slot
+ nr_of_copies
)
802 if (disk
->disk
.state
& (1<<MD_DISK_REMOVED
))
804 if (disk
->disk
.state
& (1<<MD_DISK_FAULTY
))
806 if (!(disk
->disk
.state
& (1<<MD_DISK_SYNC
)))
809 /* We have found a good disk to use! */
811 disk
->next
= sra
->devs
;
820 if (slot
< sra
->array
.raid_disks
) {
821 /* didn't find all slots */
827 sra
->devs
= remaining
;
831 /* Remove all 'remaining' devices from the array */
833 struct mdinfo
*sd
= remaining
;
834 remaining
= sd
->next
;
836 sysfs_set_str(sra
, sd
, "state", "faulty");
837 sysfs_set_str(sra
, sd
, "slot", "none");
838 /* for external metadata disks should be removed in mdmon */
839 if (!st
->ss
->external
)
840 sysfs_set_str(sra
, sd
, "state", "remove");
841 sd
->disk
.state
|= (1<<MD_DISK_REMOVED
);
842 sd
->disk
.state
&= ~(1<<MD_DISK_SYNC
);
843 sd
->next
= sra
->devs
;
849 void reshape_free_fdlist(int *fdlist
,
850 unsigned long long *offsets
,
855 for (i
= 0; i
< size
; i
++)
863 int reshape_prepare_fdlist(char *devname
,
867 unsigned long blocks
,
870 unsigned long long *offsets
)
876 for (d
= 0; d
<= nrdisks
; d
++)
879 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
880 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
882 if (sd
->disk
.state
& (1<<MD_DISK_SYNC
) &&
883 sd
->disk
.raid_disk
< raid_disks
) {
884 char *dn
= map_dev(sd
->disk
.major
,
886 fdlist
[sd
->disk
.raid_disk
]
887 = dev_open(dn
, O_RDONLY
);
888 offsets
[sd
->disk
.raid_disk
] = sd
->data_offset
*512;
889 if (fdlist
[sd
->disk
.raid_disk
] < 0) {
890 pr_err("%s: cannot open component %s\n",
891 devname
, dn
? dn
: "-unknown-");
895 } else if (backup_file
== NULL
) {
897 char *dn
= map_dev(sd
->disk
.major
,
899 fdlist
[d
] = dev_open(dn
, O_RDWR
);
900 offsets
[d
] = (sd
->data_offset
+ sra
->component_size
- blocks
- 8)*512;
902 pr_err("%s: cannot open component %s\n",
903 devname
, dn
? dn
: "-unknown-");
914 int reshape_open_backup_file(char *backup_file
,
919 unsigned long long *offsets
,
923 /* Return 1 on success, 0 on any form of failure */
924 /* need to check backup file is large enough */
930 *fdlist
= open(backup_file
, O_RDWR
|O_CREAT
|(restart
? O_TRUNC
: O_EXCL
),
934 pr_err("%s: cannot create backup file %s: %s\n",
935 devname
, backup_file
, strerror(errno
));
938 /* Guard against backup file being on array device.
939 * If array is partitioned or if LVM etc is in the
940 * way this will not notice, but it is better than
943 fstat(*fdlist
, &stb
);
946 if (stb
.st_rdev
== dev
) {
947 pr_err("backup file must NOT be on the array being reshaped.\n");
953 for (i
=0; i
< blocks
+ 8 ; i
++) {
954 if (write(*fdlist
, buf
, 512) != 512) {
955 pr_err("%s: cannot create backup file %s: %s\n",
956 devname
, backup_file
, strerror(errno
));
960 if (fsync(*fdlist
) != 0) {
961 pr_err("%s: cannot create backup file %s: %s\n",
962 devname
, backup_file
, strerror(errno
));
966 if (!restart
&& strncmp(backup_file
, MAP_DIR
, strlen(MAP_DIR
)) != 0) {
967 char *bu
= make_backup(sys_name
);
968 if (symlink(backup_file
, bu
))
969 pr_err("Recording backup file in " MAP_DIR
" failed: %s\n",
977 unsigned long compute_backup_blocks(int nchunk
, int ochunk
,
978 unsigned int ndata
, unsigned int odata
)
980 unsigned long a
, b
, blocks
;
981 /* So how much do we need to backup.
982 * We need an amount of data which is both a whole number of
983 * old stripes and a whole number of new stripes.
984 * So LCM for (chunksize*datadisks).
986 a
= (ochunk
/512) * odata
;
987 b
= (nchunk
/512) * ndata
;
990 /* LCM == product / GCD */
991 blocks
= (ochunk
/512) * (nchunk
/512) * odata
* ndata
/ a
;
996 char *analyse_change(char *devname
, struct mdinfo
*info
, struct reshape
*re
)
998 /* Based on the current array state in info->array and
999 * the changes in info->new_* etc, determine:
1000 * - whether the change is possible
1001 * - Intermediate level/raid_disks/layout
1002 * - whether a restriping reshape is needed
1003 * - number of sectors in minimum change unit. This
1004 * will cover a whole number of stripes in 'before' and
1007 * Return message if the change should be rejected
1008 * NULL if the change can be achieved
1010 * This can be called as part of starting a reshape, or
1011 * when assembling an array that is undergoing reshape.
1013 int near
, far
, offset
, copies
;
1015 int old_chunk
, new_chunk
;
1016 /* delta_parity records change in number of devices
1017 * caused by level change
1019 int delta_parity
= 0;
1021 memset(re
, 0, sizeof(*re
));
1023 /* If a new level not explicitly given, we assume no-change */
1024 if (info
->new_level
== UnSet
)
1025 info
->new_level
= info
->array
.level
;
1027 if (info
->new_chunk
)
1028 switch (info
->new_level
) {
1034 /* chunk size is meaningful, must divide component_size
1037 if (info
->component_size
% (info
->new_chunk
/512)) {
1038 unsigned long long shrink
= info
->component_size
;
1039 shrink
&= ~(unsigned long long)(info
->new_chunk
/512-1);
1040 pr_err("New chunk size (%dK) does not evenly divide device size (%lluk)\n",
1041 info
->new_chunk
/1024, info
->component_size
/2);
1042 pr_err("After shrinking any filesystem, \"mdadm --grow %s --size %llu\"\n",
1044 pr_err("will shrink the array so the given chunk size would work.\n");
1049 return "chunk size not meaningful for this level";
1052 info
->new_chunk
= info
->array
.chunk_size
;
1054 switch (info
->array
.level
) {
1056 return "No reshape is possibly for this RAID level";
1058 if (info
->delta_disks
!= UnSet
)
1059 return "Only --add is supported for LINEAR, setting --raid-disks is not needed";
1061 return "Only --add is supported for LINEAR, other --grow options are not meaningful";
1063 /* RAID1 can convert to RAID1 with different disks, or
1064 * raid5 with 2 disks, or
1067 if (info
->new_level
> 1 &&
1068 (info
->component_size
& 7))
1069 return "Cannot convert RAID1 of this size - reduce size to multiple of 4K first.";
1070 if (info
->new_level
== 0) {
1071 if (info
->delta_disks
!= UnSet
&&
1072 info
->delta_disks
!= 0)
1073 return "Cannot change number of disks with RAID1->RAID0 conversion";
1075 re
->before
.data_disks
= 1;
1076 re
->after
.data_disks
= 1;
1079 if (info
->new_level
== 1) {
1080 if (info
->delta_disks
== UnSet
)
1081 /* Don't know what to do */
1082 return "no change requested for Growing RAID1";
1086 if (info
->array
.raid_disks
!= 2 &&
1087 info
->new_level
== 5)
1088 return "Can only convert a 2-device array to RAID5";
1089 if (info
->array
.raid_disks
== 2 &&
1090 info
->new_level
== 5) {
1093 re
->before
.data_disks
= 1;
1094 if (info
->delta_disks
!= UnSet
&&
1095 info
->delta_disks
!= 0)
1096 re
->after
.data_disks
= 1 + info
->delta_disks
;
1098 re
->after
.data_disks
= 1;
1099 if (re
->after
.data_disks
< 1)
1100 return "Number of disks too small for RAID5";
1102 re
->before
.layout
= ALGORITHM_LEFT_SYMMETRIC
;
1103 info
->array
.chunk_size
= 65536;
1106 /* Could do some multi-stage conversions, but leave that to
1109 return "Impossibly level change request for RAID1";
1112 /* RAID10 can be converted from near mode to
1113 * RAID0 by removing some devices.
1114 * It can also be reshaped if the kernel supports
1117 switch (info
->new_level
) {
1119 if ((info
->array
.layout
& ~0xff) != 0x100)
1120 return "Cannot Grow RAID10 with far/offset layout";
1121 /* number of devices must be multiple of number of copies */
1122 if (info
->array
.raid_disks
% (info
->array
.layout
& 0xff))
1123 return "RAID10 layout too complex for Grow operation";
1125 new_disks
= (info
->array
.raid_disks
1126 / (info
->array
.layout
& 0xff));
1127 if (info
->delta_disks
== UnSet
)
1128 info
->delta_disks
= (new_disks
1129 - info
->array
.raid_disks
);
1131 if (info
->delta_disks
!= new_disks
- info
->array
.raid_disks
)
1132 return "New number of raid-devices impossible for RAID10";
1133 if (info
->new_chunk
&&
1134 info
->new_chunk
!= info
->array
.chunk_size
)
1135 return "Cannot change chunk-size with RAID10 Grow";
1139 re
->before
.data_disks
= new_disks
;
1140 re
->after
.data_disks
= re
->before
.data_disks
;
1144 near
= info
->array
.layout
& 0xff;
1145 far
= (info
->array
.layout
>> 8) & 0xff;
1146 offset
= info
->array
.layout
& 0x10000;
1147 if (far
> 1 && !offset
)
1148 return "Cannot reshape RAID10 in far-mode";
1149 copies
= near
* far
;
1151 old_chunk
= info
->array
.chunk_size
* far
;
1153 if (info
->new_layout
== UnSet
)
1154 info
->new_layout
= info
->array
.layout
;
1156 near
= info
->new_layout
& 0xff;
1157 far
= (info
->new_layout
>> 8) & 0xff;
1158 offset
= info
->new_layout
& 0x10000;
1159 if (far
> 1 && !offset
)
1160 return "Cannot reshape RAID10 to far-mode";
1161 if (near
* far
!= copies
)
1162 return "Cannot change number of copies when reshaping RAID10";
1164 if (info
->delta_disks
== UnSet
)
1165 info
->delta_disks
= 0;
1166 new_disks
= (info
->array
.raid_disks
+
1169 new_chunk
= info
->new_chunk
* far
;
1172 re
->before
.layout
= info
->array
.layout
;
1173 re
->before
.data_disks
= info
->array
.raid_disks
;
1174 re
->after
.layout
= info
->new_layout
;
1175 re
->after
.data_disks
= new_disks
;
1176 /* For RAID10 we don't do backup but do allow reshape,
1177 * so set backup_blocks to INVALID_SECTORS rather than
1179 * And there is no need to synchronise stripes on both
1180 * 'old' and 'new'. So the important
1181 * number is the minimum data_offset difference
1182 * which is the larger of (offset copies * chunk).
1184 re
->backup_blocks
= INVALID_SECTORS
;
1185 re
->min_offset_change
= max(old_chunk
, new_chunk
) / 512;
1186 if (new_disks
< re
->before
.data_disks
&&
1187 info
->space_after
< re
->min_offset_change
)
1188 /* Reduce component size by one chunk */
1189 re
->new_size
= (info
->component_size
-
1190 re
->min_offset_change
);
1192 re
->new_size
= info
->component_size
;
1193 re
->new_size
= re
->new_size
* new_disks
/ copies
;
1197 return "RAID10 can only be changed to RAID0";
1200 /* RAID0 can be converted to RAID10, or to RAID456 */
1201 if (info
->new_level
== 10) {
1202 if (info
->new_layout
== UnSet
&& info
->delta_disks
== UnSet
) {
1203 /* Assume near=2 layout */
1204 info
->new_layout
= 0x102;
1205 info
->delta_disks
= info
->array
.raid_disks
;
1207 if (info
->new_layout
== UnSet
) {
1208 int copies
= 1 + (info
->delta_disks
1209 / info
->array
.raid_disks
);
1210 if (info
->array
.raid_disks
* (copies
-1)
1211 != info
->delta_disks
)
1212 return "Impossible number of devices for RAID0->RAID10";
1213 info
->new_layout
= 0x100 + copies
;
1215 if (info
->delta_disks
== UnSet
) {
1216 int copies
= info
->new_layout
& 0xff;
1217 if (info
->new_layout
!= 0x100 + copies
)
1218 return "New layout impossible for RAID0->RAID10";;
1219 info
->delta_disks
= (copies
- 1) *
1220 info
->array
.raid_disks
;
1222 if (info
->new_chunk
&&
1223 info
->new_chunk
!= info
->array
.chunk_size
)
1224 return "Cannot change chunk-size with RAID0->RAID10";
1227 re
->before
.data_disks
= (info
->array
.raid_disks
+
1229 re
->after
.data_disks
= re
->before
.data_disks
;
1230 re
->before
.layout
= info
->new_layout
;
1234 /* RAID0 can also covert to RAID0/4/5/6 by first converting to
1235 * a raid4 style layout of the final level.
1237 switch (info
->new_level
) {
1242 re
->before
.layout
= 0;
1247 re
->before
.layout
= ALGORITHM_PARITY_N
;
1248 if (info
->new_layout
== UnSet
)
1249 info
->new_layout
= map_name(r5layout
, "default");
1254 re
->before
.layout
= ALGORITHM_PARITY_N
;
1255 if (info
->new_layout
== UnSet
)
1256 info
->new_layout
= map_name(r6layout
, "default");
1259 return "Impossible level change requested";
1261 re
->before
.data_disks
= info
->array
.raid_disks
;
1262 /* determining 'after' layout happens outside this 'switch' */
1266 info
->array
.layout
= ALGORITHM_PARITY_N
;
1268 switch (info
->new_level
) {
1272 re
->level
= info
->array
.level
;
1273 re
->before
.data_disks
= info
->array
.raid_disks
- 1;
1274 re
->before
.layout
= info
->array
.layout
;
1278 re
->before
.data_disks
= info
->array
.raid_disks
- 1;
1279 re
->before
.layout
= info
->array
.layout
;
1284 re
->before
.data_disks
= info
->array
.raid_disks
- 1;
1285 switch (info
->array
.layout
) {
1286 case ALGORITHM_LEFT_ASYMMETRIC
:
1287 re
->before
.layout
= ALGORITHM_LEFT_ASYMMETRIC_6
;
1289 case ALGORITHM_RIGHT_ASYMMETRIC
:
1290 re
->before
.layout
= ALGORITHM_RIGHT_ASYMMETRIC_6
;
1292 case ALGORITHM_LEFT_SYMMETRIC
:
1293 re
->before
.layout
= ALGORITHM_LEFT_SYMMETRIC_6
;
1295 case ALGORITHM_RIGHT_SYMMETRIC
:
1296 re
->before
.layout
= ALGORITHM_RIGHT_SYMMETRIC_6
;
1298 case ALGORITHM_PARITY_0
:
1299 re
->before
.layout
= ALGORITHM_PARITY_0_6
;
1301 case ALGORITHM_PARITY_N
:
1302 re
->before
.layout
= ALGORITHM_PARITY_N_6
;
1305 return "Cannot convert an array with this layout";
1309 if (info
->array
.raid_disks
!= 2)
1310 return "Can only convert a 2-device array to RAID1";
1311 if (info
->delta_disks
!= UnSet
&&
1312 info
->delta_disks
!= 0)
1313 return "Cannot set raid_disk when converting RAID5->RAID1";
1315 info
->new_chunk
= 0;
1318 return "Impossible level change requested";
1322 switch (info
->new_level
) {
1328 re
->before
.data_disks
= info
->array
.raid_disks
- 2;
1329 re
->before
.layout
= info
->array
.layout
;
1332 return "Impossible level change requested";
1337 /* If we reached here then it looks like a re-stripe is
1338 * happening. We have determined the intermediate level
1339 * and initial raid_disks/layout and stored these in 're'.
1341 * We need to deduce the final layout that can be atomically
1342 * converted to the end state.
1344 switch (info
->new_level
) {
1346 /* We can only get to RAID0 from RAID4 or RAID5
1347 * with appropriate layout and one extra device
1349 if (re
->level
!= 4 && re
->level
!= 5)
1350 return "Cannot covert to RAID0 from this level";
1352 switch (re
->level
) {
1354 re
->before
.layout
= 0;
1355 re
->after
.layout
= 0;
1358 re
->after
.layout
= ALGORITHM_PARITY_N
;
1364 /* We can only get to RAID4 from RAID5 */
1365 if (re
->level
!= 4 && re
->level
!= 5)
1366 return "Cannot convert to RAID4 from this level";
1368 switch (re
->level
) {
1370 re
->after
.layout
= 0;
1373 re
->after
.layout
= ALGORITHM_PARITY_N
;
1379 /* We get to RAID5 from RAID5 or RAID6 */
1380 if (re
->level
!= 5 && re
->level
!= 6)
1381 return "Cannot convert to RAID5 from this level";
1383 switch (re
->level
) {
1385 if (info
->new_layout
== UnSet
)
1386 re
->after
.layout
= re
->before
.layout
;
1388 re
->after
.layout
= info
->new_layout
;
1391 if (info
->new_layout
== UnSet
)
1392 info
->new_layout
= re
->before
.layout
;
1394 /* after.layout needs to be raid6 version of new_layout */
1395 if (info
->new_layout
== ALGORITHM_PARITY_N
)
1396 re
->after
.layout
= ALGORITHM_PARITY_N
;
1399 char *ls
= map_num(r5layout
, info
->new_layout
);
1402 /* Current RAID6 layout has a RAID5
1405 strcat(strcpy(layout
, ls
), "-6");
1406 l
= map_name(r6layout
, layout
);
1408 return "Cannot find RAID6 layout to convert to";
1410 /* Current RAID6 has no equivalent.
1411 * If it is already a '-6' layout we
1412 * can leave it unchanged, else we must
1415 ls
= map_num(r6layout
, info
->new_layout
);
1417 strcmp(ls
+strlen(ls
)-2, "-6") != 0)
1418 return "Please specify new layout";
1419 l
= info
->new_layout
;
1421 re
->after
.layout
= l
;
1427 /* We must already be at level 6 */
1429 return "Impossible level change";
1430 if (info
->new_layout
== UnSet
)
1431 re
->after
.layout
= info
->array
.layout
;
1433 re
->after
.layout
= info
->new_layout
;
1436 return "Impossible level change requested";
1438 if (info
->delta_disks
== UnSet
)
1439 info
->delta_disks
= delta_parity
;
1441 re
->after
.data_disks
= (re
->before
.data_disks
1444 switch (re
->level
) {
1445 case 6: re
->parity
= 2;
1448 case 5: re
->parity
= 1;
1450 default: re
->parity
= 0;
1453 /* So we have a restripe operation, we need to calculate the number
1454 * of blocks per reshape operation.
1456 re
->new_size
= info
->component_size
* re
->before
.data_disks
;
1457 if (info
->new_chunk
== 0)
1458 info
->new_chunk
= info
->array
.chunk_size
;
1459 if (re
->after
.data_disks
== re
->before
.data_disks
&&
1460 re
->after
.layout
== re
->before
.layout
&&
1461 info
->new_chunk
== info
->array
.chunk_size
) {
1462 /* Nothing to change, can change level immediately. */
1463 re
->level
= info
->new_level
;
1464 re
->backup_blocks
= 0;
1467 if (re
->after
.data_disks
== 1 && re
->before
.data_disks
== 1) {
1468 /* chunk and layout changes make no difference */
1469 re
->level
= info
->new_level
;
1470 re
->backup_blocks
= 0;
1474 if (re
->after
.data_disks
== re
->before
.data_disks
&&
1475 get_linux_version() < 2006032)
1476 return "in-place reshape is not safe before 2.6.32 - sorry.";
1478 if (re
->after
.data_disks
< re
->before
.data_disks
&&
1479 get_linux_version() < 2006030)
1480 return "reshape to fewer devices is not supported before 2.6.30 - sorry.";
1482 re
->backup_blocks
= compute_backup_blocks(
1483 info
->new_chunk
, info
->array
.chunk_size
,
1484 re
->after
.data_disks
,
1485 re
->before
.data_disks
);
1486 re
->min_offset_change
= re
->backup_blocks
/ re
->before
.data_disks
;
1488 re
->new_size
= info
->component_size
* re
->after
.data_disks
;
1492 static int set_array_size(struct supertype
*st
, struct mdinfo
*sra
,
1495 struct mdinfo
*info
;
1499 if ((st
== NULL
) || (sra
== NULL
))
1502 if (text_version
== NULL
)
1503 text_version
= sra
->text_version
;
1504 subarray
= strchr(text_version
+1, '/')+1;
1505 info
= st
->ss
->container_content(st
, subarray
);
1507 unsigned long long current_size
= 0;
1508 unsigned long long new_size
=
1509 info
->custom_array_size
/2;
1511 if (sysfs_get_ll(sra
, NULL
, "array_size", ¤t_size
) == 0 &&
1512 new_size
> current_size
) {
1513 if (sysfs_set_num(sra
, NULL
, "array_size", new_size
)
1515 dprintf("Error: Cannot set array size");
1518 dprintf("Array size changed");
1520 dprintf_cont(" from %llu to %llu.\n",
1521 current_size
, new_size
);
1525 dprintf("Error: set_array_size(): info pointer in NULL\n");
1530 static int reshape_array(char *container
, int fd
, char *devname
,
1531 struct supertype
*st
, struct mdinfo
*info
,
1532 int force
, struct mddev_dev
*devlist
,
1533 unsigned long long data_offset
,
1534 char *backup_file
, int verbose
, int forked
,
1535 int restart
, int freeze_reshape
);
1536 static int reshape_container(char *container
, char *devname
,
1538 struct supertype
*st
,
1539 struct mdinfo
*info
,
1541 char *backup_file
, int verbose
,
1542 int forked
, int restart
, int freeze_reshape
);
1544 int Grow_reshape(char *devname
, int fd
,
1545 struct mddev_dev
*devlist
,
1546 unsigned long long data_offset
,
1547 struct context
*c
, struct shape
*s
)
1549 /* Make some changes in the shape of an array.
1550 * The kernel must support the change.
1552 * There are three different changes. Each can trigger
1553 * a resync or recovery so we freeze that until we have
1554 * requested everything (if kernel supports freezing - 2.6.30).
1556 * - change size (i.e. component_size)
1558 * - change layout/chunksize/ndisks
1560 * The last can require a reshape. It is different on different
1561 * levels so we need to check the level before actioning it.
1562 * Some times the level change needs to be requested after the
1563 * reshape (e.g. raid6->raid5, raid5->raid0)
1566 struct mdu_array_info_s array
;
1568 struct supertype
*st
;
1569 char *subarray
= NULL
;
1573 char *container
= NULL
;
1576 struct mddev_dev
*dv
;
1582 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) < 0) {
1583 pr_err("%s is not an active md array - aborting\n",
1587 if (data_offset
!= INVALID_SECTORS
&& array
.level
!= 10
1588 && (array
.level
< 4 || array
.level
> 6)) {
1589 pr_err("--grow --data-offset not yet supported\n");
1594 (s
->chunk
|| s
->level
!= UnSet
|| s
->layout_str
|| s
->raiddisks
)) {
1595 pr_err("cannot change component size at the same time as other changes.\n"
1596 " Change size first, then check data is intact before making other changes.\n");
1600 if (s
->raiddisks
&& s
->raiddisks
< array
.raid_disks
&& array
.level
> 1 &&
1601 get_linux_version() < 2006032 &&
1602 !check_env("MDADM_FORCE_FEWER")) {
1603 pr_err("reducing the number of devices is not safe before Linux 2.6.32\n"
1604 " Please use a newer kernel\n");
1608 st
= super_by_fd(fd
, &subarray
);
1610 pr_err("Unable to determine metadata format for %s\n", devname
);
1613 if (s
->raiddisks
> st
->max_devs
) {
1614 pr_err("Cannot increase raid-disks on this array beyond %d\n", st
->max_devs
);
1617 if (s
->level
== 0 &&
1618 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)) &&
1619 !(array
.state
& (1<<MD_SB_CLUSTERED
))) {
1620 array
.state
&= ~(1<<MD_SB_BITMAP_PRESENT
);
1621 if (ioctl(fd
, SET_ARRAY_INFO
, &array
)!= 0) {
1622 pr_err("failed to remove internal bitmap.\n");
1627 /* in the external case we need to check that the requested reshape is
1628 * supported, and perform an initial check that the container holds the
1629 * pre-requisite spare devices (mdmon owns final validation)
1631 if (st
->ss
->external
) {
1635 container
= st
->container_devnm
;
1636 cfd
= open_dev_excl(st
->container_devnm
);
1638 container
= st
->devnm
;
1640 cfd
= open_dev_excl(st
->devnm
);
1644 pr_err("Unable to open container for %s\n",
1650 rv
= st
->ss
->load_container(st
, cfd
, NULL
);
1653 pr_err("Cannot read superblock for %s\n",
1659 /* check if operation is supported for metadata handler */
1660 if (st
->ss
->container_content
) {
1661 struct mdinfo
*cc
= NULL
;
1662 struct mdinfo
*content
= NULL
;
1664 cc
= st
->ss
->container_content(st
, subarray
);
1665 for (content
= cc
; content
; content
= content
->next
) {
1666 int allow_reshape
= 1;
1668 /* check if reshape is allowed based on metadata
1669 * indications stored in content.array.status
1671 if (content
->array
.state
& (1<<MD_SB_BLOCK_VOLUME
))
1673 if (content
->array
.state
1674 & (1<<MD_SB_BLOCK_CONTAINER_RESHAPE
))
1676 if (!allow_reshape
) {
1677 pr_err("cannot reshape arrays in container with unsupported metadata: %s(%s)\n",
1678 devname
, container
);
1686 if (mdmon_running(container
))
1687 st
->update_tail
= &st
->updates
;
1691 for (dv
= devlist
; dv
; dv
= dv
->next
)
1693 if (s
->raiddisks
> array
.raid_disks
&&
1694 array
.spare_disks
+added_disks
< (s
->raiddisks
- array
.raid_disks
) &&
1696 pr_err("Need %d spare%s to avoid degraded array, and only have %d.\n"
1697 " Use --force to over-ride this check.\n",
1698 s
->raiddisks
- array
.raid_disks
,
1699 s
->raiddisks
- array
.raid_disks
== 1 ? "" : "s",
1700 array
.spare_disks
+ added_disks
);
1704 sra
= sysfs_read(fd
, NULL
, GET_LEVEL
| GET_DISKS
| GET_DEVS
1705 | GET_STATE
| GET_VERSION
);
1707 if (st
->ss
->external
&& subarray
== NULL
) {
1708 array
.level
= LEVEL_CONTAINER
;
1709 sra
->array
.level
= LEVEL_CONTAINER
;
1712 pr_err("failed to read sysfs parameters for %s\n",
1716 frozen
= freeze(st
);
1718 /* freeze() already spewed the reason */
1721 } else if (frozen
< 0) {
1722 pr_err("%s is performing resync/recovery and cannot be reshaped\n", devname
);
1727 /* ========= set size =============== */
1728 if (s
->size
> 0 && (s
->size
== MAX_SIZE
|| s
->size
!= (unsigned)array
.size
)) {
1729 unsigned long long orig_size
= get_component_size(fd
)/2;
1730 unsigned long long min_csize
;
1732 int raid0_takeover
= 0;
1735 orig_size
= (unsigned) array
.size
;
1737 if (orig_size
== 0) {
1738 pr_err("Cannot set device size in this type of array.\n");
1743 if (reshape_super(st
, s
->size
, UnSet
, UnSet
, 0, 0, UnSet
, NULL
,
1744 devname
, APPLY_METADATA_CHANGES
, c
->verbose
> 0)) {
1749 if (st
->ss
->external
) {
1750 /* metadata can have size limitation
1751 * update size value according to metadata information
1753 struct mdinfo
*sizeinfo
=
1754 st
->ss
->container_content(st
, subarray
);
1756 unsigned long long new_size
=
1757 sizeinfo
->custom_array_size
/2;
1758 int data_disks
= get_data_disks(
1759 sizeinfo
->array
.level
,
1760 sizeinfo
->array
.layout
,
1761 sizeinfo
->array
.raid_disks
);
1762 new_size
/= data_disks
;
1763 dprintf("Metadata size correction from %llu to %llu (%llu)\n", orig_size
, new_size
,
1764 new_size
* data_disks
);
1766 sysfs_free(sizeinfo
);
1770 /* Update the size of each member device in case
1771 * they have been resized. This will never reduce
1772 * below the current used-size. The "size" attribute
1773 * understands '0' to mean 'max'.
1777 for (mdi
= sra
->devs
; mdi
; mdi
= mdi
->next
) {
1778 if (sysfs_set_num(sra
, mdi
, "size",
1779 s
->size
== MAX_SIZE
? 0 : s
->size
) < 0) {
1780 /* Probably kernel refusing to let us
1781 * reduce the size - not an error.
1785 if (array
.not_persistent
== 0 &&
1786 array
.major_version
== 0 &&
1787 get_linux_version() < 3001000) {
1788 /* Dangerous to allow size to exceed 2TB */
1789 unsigned long long csize
;
1790 if (sysfs_get_ll(sra
, mdi
, "size", &csize
) == 0) {
1791 if (csize
>= 2ULL*1024*1024*1024)
1792 csize
= 2ULL*1024*1024*1024;
1793 if ((min_csize
== 0 || (min_csize
1800 pr_err("Cannot set size on array members.\n");
1801 goto size_change_error
;
1803 if (min_csize
&& s
->size
> min_csize
) {
1804 pr_err("Cannot safely make this array use more than 2TB per device on this kernel.\n");
1806 goto size_change_error
;
1808 if (min_csize
&& s
->size
== MAX_SIZE
) {
1809 /* Don't let the kernel choose a size - it will get
1812 pr_err("Limited v0.90 array to 2TB per device\n");
1813 s
->size
= min_csize
;
1815 if (st
->ss
->external
) {
1816 if (sra
->array
.level
== 0) {
1817 rv
= sysfs_set_str(sra
, NULL
, "level",
1821 /* get array parameters after takeover
1822 * to change one parameter at time only
1824 rv
= ioctl(fd
, GET_ARRAY_INFO
, &array
);
1827 /* make sure mdmon is
1828 * aware of the new level */
1829 if (!mdmon_running(st
->container_devnm
))
1830 start_mdmon(st
->container_devnm
);
1831 ping_monitor(container
);
1832 if (mdmon_running(st
->container_devnm
) &&
1833 st
->update_tail
== NULL
)
1834 st
->update_tail
= &st
->updates
;
1837 if (s
->size
== MAX_SIZE
)
1839 array
.size
= s
->size
;
1840 if (s
->size
& ~INT32_MAX
) {
1841 /* got truncated to 32bit, write to
1842 * component_size instead
1845 rv
= sysfs_set_num(sra
, NULL
,
1846 "component_size", s
->size
);
1850 rv
= ioctl(fd
, SET_ARRAY_INFO
, &array
);
1852 /* manage array size when it is managed externally
1854 if ((rv
== 0) && st
->ss
->external
)
1855 rv
= set_array_size(st
, sra
, sra
->text_version
);
1858 if (raid0_takeover
) {
1859 /* do not recync non-existing parity,
1860 * we will drop it anyway
1862 sysfs_set_str(sra
, NULL
, "sync_action", "frozen");
1863 /* go back to raid0, drop parity disk
1865 sysfs_set_str(sra
, NULL
, "level", "raid0");
1866 ioctl(fd
, GET_ARRAY_INFO
, &array
);
1873 /* restore metadata */
1874 if (reshape_super(st
, orig_size
, UnSet
, UnSet
, 0, 0,
1875 UnSet
, NULL
, devname
,
1876 ROLLBACK_METADATA_CHANGES
,
1879 pr_err("Cannot set device size for %s: %s\n",
1880 devname
, strerror(err
));
1882 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
1883 cont_err("Bitmap must be removed before size can be changed\n");
1887 if (s
->assume_clean
) {
1888 /* This will fail on kernels older than 3.0 unless
1889 * a backport has been arranged.
1892 sysfs_set_str(sra
, NULL
, "resync_start", "none") < 0)
1893 pr_err("--assume-clean not supported with --grow on this kernel\n");
1895 ioctl(fd
, GET_ARRAY_INFO
, &array
);
1896 s
->size
= get_component_size(fd
)/2;
1898 s
->size
= array
.size
;
1899 if (c
->verbose
>= 0) {
1900 if (s
->size
== orig_size
)
1901 pr_err("component size of %s unchanged at %lluK\n",
1904 pr_err("component size of %s has been set to %lluK\n",
1908 } else if (array
.level
!= LEVEL_CONTAINER
) {
1909 s
->size
= get_component_size(fd
)/2;
1911 s
->size
= array
.size
;
1914 /* See if there is anything else to do */
1915 if ((s
->level
== UnSet
|| s
->level
== array
.level
) &&
1916 (s
->layout_str
== NULL
) &&
1917 (s
->chunk
== 0 || s
->chunk
== array
.chunk_size
) &&
1918 data_offset
== INVALID_SECTORS
&&
1919 (s
->raiddisks
== 0 || s
->raiddisks
== array
.raid_disks
)) {
1920 /* Nothing more to do */
1921 if (!changed
&& c
->verbose
>= 0)
1922 pr_err("%s: no change requested\n",
1927 /* ========= check for Raid10/Raid1 -> Raid0 conversion ===============
1928 * current implementation assumes that following conditions must be met:
1931 * - near_copies == 2
1933 if ((s
->level
== 0 && array
.level
== 10 && sra
&&
1934 array
.layout
== ((1 << 8) + 2) && !(array
.raid_disks
& 1)) ||
1935 (s
->level
== 0 && array
.level
== 1 && sra
)) {
1937 err
= remove_disks_for_takeover(st
, sra
, array
.layout
);
1939 dprintf("Array cannot be reshaped\n");
1945 /* Make sure mdmon has seen the device removal
1946 * and updated metadata before we continue with
1950 ping_monitor(container
);
1953 memset(&info
, 0, sizeof(info
));
1955 sysfs_init(&info
, fd
, NULL
);
1956 strcpy(info
.text_version
, sra
->text_version
);
1957 info
.component_size
= s
->size
*2;
1958 info
.new_level
= s
->level
;
1959 info
.new_chunk
= s
->chunk
* 1024;
1960 if (info
.array
.level
== LEVEL_CONTAINER
) {
1961 info
.delta_disks
= UnSet
;
1962 info
.array
.raid_disks
= s
->raiddisks
;
1963 } else if (s
->raiddisks
)
1964 info
.delta_disks
= s
->raiddisks
- info
.array
.raid_disks
;
1966 info
.delta_disks
= UnSet
;
1967 if (s
->layout_str
== NULL
) {
1968 info
.new_layout
= UnSet
;
1969 if (info
.array
.level
== 6 &&
1970 (info
.new_level
== 6 || info
.new_level
== UnSet
) &&
1971 info
.array
.layout
>= 16) {
1972 pr_err("%s has a non-standard layout. If you wish to preserve this\n", devname
);
1973 cont_err("during the reshape, please specify --layout=preserve\n");
1974 cont_err("If you want to change it, specify a layout or use --layout=normalise\n");
1978 } else if (strcmp(s
->layout_str
, "normalise") == 0 ||
1979 strcmp(s
->layout_str
, "normalize") == 0) {
1980 /* If we have a -6 RAID6 layout, remove the '-6'. */
1981 info
.new_layout
= UnSet
;
1982 if (info
.array
.level
== 6 && info
.new_level
== UnSet
) {
1984 strcpy(l
, map_num(r6layout
, info
.array
.layout
));
1985 h
= strrchr(l
, '-');
1986 if (h
&& strcmp(h
, "-6") == 0) {
1988 info
.new_layout
= map_name(r6layout
, l
);
1991 pr_err("%s is only meaningful when reshaping a RAID6 array.\n", s
->layout_str
);
1995 } else if (strcmp(s
->layout_str
, "preserve") == 0) {
1996 /* This means that a non-standard RAID6 layout
1999 * - When reshape a RAID6 (e.g. adding a device)
2000 * which is in a non-standard layout, it is OK
2001 * to preserve that layout.
2002 * - When converting a RAID5 to RAID6, leave it in
2003 * the XXX-6 layout, don't re-layout.
2005 if (info
.array
.level
== 6 && info
.new_level
== UnSet
)
2006 info
.new_layout
= info
.array
.layout
;
2007 else if (info
.array
.level
== 5 && info
.new_level
== 6) {
2009 strcpy(l
, map_num(r5layout
, info
.array
.layout
));
2011 info
.new_layout
= map_name(r6layout
, l
);
2013 pr_err("%s in only meaningful when reshaping to RAID6\n", s
->layout_str
);
2018 int l
= info
.new_level
;
2020 l
= info
.array
.level
;
2023 info
.new_layout
= map_name(r5layout
, s
->layout_str
);
2026 info
.new_layout
= map_name(r6layout
, s
->layout_str
);
2029 info
.new_layout
= parse_layout_10(s
->layout_str
);
2032 info
.new_layout
= parse_layout_faulty(s
->layout_str
);
2035 pr_err("layout not meaningful with this level\n");
2039 if (info
.new_layout
== UnSet
) {
2040 pr_err("layout %s not understood for this level\n",
2047 if (array
.level
== LEVEL_FAULTY
) {
2048 if (s
->level
!= UnSet
&& s
->level
!= array
.level
) {
2049 pr_err("cannot change level of Faulty device\n");
2053 pr_err("cannot set chunksize of Faulty device\n");
2056 if (s
->raiddisks
&& s
->raiddisks
!= 1) {
2057 pr_err("cannot set raid_disks of Faulty device\n");
2060 if (s
->layout_str
) {
2061 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) != 0) {
2062 dprintf("Cannot get array information.\n");
2065 array
.layout
= info
.new_layout
;
2066 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
2067 pr_err("failed to set new layout\n");
2069 } else if (c
->verbose
>= 0)
2070 printf("layout for %s set to %d\n",
2071 devname
, array
.layout
);
2073 } else if (array
.level
== LEVEL_CONTAINER
) {
2074 /* This change is to be applied to every array in the
2075 * container. This is only needed when the metadata imposes
2076 * restraints of the various arrays in the container.
2077 * Currently we only know that IMSM requires all arrays
2078 * to have the same number of devices so changing the
2079 * number of devices (On-Line Capacity Expansion) must be
2080 * performed at the level of the container
2086 rv
= reshape_container(container
, devname
, -1, st
, &info
,
2087 c
->force
, c
->backup_file
, c
->verbose
, 0, 0, 0);
2090 /* get spare devices from external metadata
2092 if (st
->ss
->external
) {
2093 struct mdinfo
*info2
;
2095 info2
= st
->ss
->container_content(st
, subarray
);
2097 info
.array
.spare_disks
=
2098 info2
->array
.spare_disks
;
2103 /* Impose these changes on a single array. First
2104 * check that the metadata is OK with the change. */
2106 if (reshape_super(st
, 0, info
.new_level
,
2107 info
.new_layout
, info
.new_chunk
,
2108 info
.array
.raid_disks
, info
.delta_disks
,
2109 c
->backup_file
, devname
, APPLY_METADATA_CHANGES
,
2115 rv
= reshape_array(container
, fd
, devname
, st
, &info
, c
->force
,
2116 devlist
, data_offset
, c
->backup_file
, c
->verbose
,
2127 /* verify_reshape_position()
2128 * Function checks if reshape position in metadata is not farther
2129 * than position in md.
2131 * 0 : not valid sysfs entry
2132 * it can be caused by not started reshape, it should be started
2133 * by reshape array or raid0 array is before takeover
2134 * -1 : error, reshape position is obviously wrong
2135 * 1 : success, reshape progress correct or updated
2137 static int verify_reshape_position(struct mdinfo
*info
, int level
)
2143 /* read sync_max, failure can mean raid0 array */
2144 rv
= sysfs_get_str(info
, NULL
, "sync_max", buf
, 40);
2148 unsigned long long position
= strtoull(buf
, &ep
, 0);
2150 dprintf("Read sync_max sysfs entry is: %s\n", buf
);
2151 if (!(ep
== buf
|| (*ep
!= 0 && *ep
!= '\n' && *ep
!= ' '))) {
2152 position
*= get_data_disks(level
,
2154 info
->array
.raid_disks
);
2155 if (info
->reshape_progress
< position
) {
2156 dprintf("Corrected reshape progress (%llu) to md position (%llu)\n",
2157 info
->reshape_progress
, position
);
2158 info
->reshape_progress
= position
;
2160 } else if (info
->reshape_progress
> position
) {
2161 pr_err("Fatal error: array reshape was not properly frozen (expected reshape position is %llu, but reshape progress is %llu.\n",
2162 position
, info
->reshape_progress
);
2165 dprintf("Reshape position in md and metadata are the same;");
2169 } else if (rv
== 0) {
2170 /* for valid sysfs entry, 0-length content
2171 * should be indicated as error
2179 static unsigned long long choose_offset(unsigned long long lo
,
2180 unsigned long long hi
,
2181 unsigned long long min
,
2182 unsigned long long max
)
2184 /* Choose a new offset between hi and lo.
2185 * It must be between min and max, but
2186 * we would prefer something near the middle of hi/lo, and also
2187 * prefer to be aligned to a big power of 2.
2189 * So we start with the middle, then for each bit,
2190 * starting at '1' and increasing, if it is set, we either
2191 * add it or subtract it if possible, preferring the option
2192 * which is furthest from the boundary.
2194 * We stop once we get a 1MB alignment. As units are in sectors,
2195 * 1MB = 2*1024 sectors.
2197 unsigned long long choice
= (lo
+ hi
) / 2;
2198 unsigned long long bit
= 1;
2200 for (bit
= 1; bit
< 2*1024; bit
= bit
<< 1) {
2201 unsigned long long bigger
, smaller
;
2202 if (! (bit
& choice
))
2204 bigger
= choice
+ bit
;
2205 smaller
= choice
- bit
;
2206 if (bigger
> max
&& smaller
< min
)
2210 else if (smaller
< min
)
2212 else if (hi
- bigger
> smaller
- lo
)
2220 static int set_new_data_offset(struct mdinfo
*sra
, struct supertype
*st
,
2221 char *devname
, int delta_disks
,
2222 unsigned long long data_offset
,
2223 unsigned long long min
,
2229 unsigned long long before
, after
;
2231 /* Need to find min space before and after so same is used
2234 before
= UINT64_MAX
;
2236 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
2240 struct supertype
*st2
;
2241 struct mdinfo info2
;
2243 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
2245 dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 0);
2246 dfd
= dev_open(dn
, O_RDONLY
);
2248 pr_err("%s: cannot open component %s\n",
2249 devname
, dn
? dn
: "-unknown-");
2252 st2
= dup_super(st
);
2253 rv
= st2
->ss
->load_super(st2
,dfd
, NULL
);
2257 pr_err("%s: cannot get superblock from %s\n",
2261 st2
->ss
->getinfo_super(st2
, &info2
, NULL
);
2262 st2
->ss
->free_super(st2
);
2264 if (info2
.space_before
== 0 &&
2265 info2
.space_after
== 0) {
2266 /* Metadata doesn't support data_offset changes */
2268 pr_err("%s: Metadata version doesn't support data_offset changes\n",
2272 if (before
> info2
.space_before
)
2273 before
= info2
.space_before
;
2274 if (after
> info2
.space_after
)
2275 after
= info2
.space_after
;
2277 if (data_offset
!= INVALID_SECTORS
) {
2279 if (info2
.data_offset
== data_offset
) {
2280 pr_err("%s: already has that data_offset\n",
2284 if (data_offset
< info2
.data_offset
)
2288 } else if ((data_offset
<= info2
.data_offset
&& dir
== 1) ||
2289 (data_offset
>= info2
.data_offset
&& dir
== -1)) {
2290 pr_err("%s: differing data offsets on devices make this --data-offset setting impossible\n",
2296 if (before
== UINT64_MAX
)
2297 /* impossible really, there must be no devices */
2300 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
2301 char *dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 0);
2302 unsigned long long new_data_offset
;
2304 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
2306 if (delta_disks
< 0) {
2307 /* Don't need any space as array is shrinking
2308 * just move data_offset up by min
2310 if (data_offset
== INVALID_SECTORS
)
2311 new_data_offset
= sd
->data_offset
+ min
;
2313 if (data_offset
< sd
->data_offset
+ min
) {
2314 pr_err("--data-offset too small for %s\n",
2318 new_data_offset
= data_offset
;
2320 } else if (delta_disks
> 0) {
2321 /* need space before */
2325 pr_err("Insufficient head-space for reshape on %s\n",
2329 if (data_offset
== INVALID_SECTORS
)
2330 new_data_offset
= sd
->data_offset
- min
;
2332 if (data_offset
> sd
->data_offset
- min
) {
2333 pr_err("--data-offset too large for %s\n",
2337 new_data_offset
= data_offset
;
2341 /* can move up or down. If 'data_offset'
2342 * was set we would have already decided,
2343 * so just choose direction with most space.
2350 sysfs_set_str(sra
, NULL
, "reshape_direction",
2351 dir
== 1 ? "backwards" : "forwards");
2353 /* Increase data offset */
2357 pr_err("Insufficient tail-space for reshape on %s\n",
2361 if (data_offset
!= INVALID_SECTORS
&&
2362 data_offset
< sd
->data_offset
+ min
) {
2363 pr_err("--data-offset too small on %s\n",
2367 if (data_offset
!= INVALID_SECTORS
)
2368 new_data_offset
= data_offset
;
2370 new_data_offset
= choose_offset(sd
->data_offset
,
2371 sd
->data_offset
+ after
,
2372 sd
->data_offset
+ min
,
2373 sd
->data_offset
+ after
);
2375 /* Decrease data offset */
2379 pr_err("insufficient head-room on %s\n",
2383 if (data_offset
!= INVALID_SECTORS
&&
2384 data_offset
< sd
->data_offset
- min
) {
2385 pr_err("--data-offset too small on %s\n",
2389 if (data_offset
!= INVALID_SECTORS
)
2390 new_data_offset
= data_offset
;
2392 new_data_offset
= choose_offset(sd
->data_offset
- before
,
2394 sd
->data_offset
- before
,
2395 sd
->data_offset
- min
);
2398 err
= sysfs_set_num(sra
, sd
, "new_offset", new_data_offset
);
2399 if (err
< 0 && errno
== E2BIG
) {
2400 /* try again after increasing data size to max */
2401 err
= sysfs_set_num(sra
, sd
, "size", 0);
2402 if (err
< 0 && errno
== EINVAL
&&
2403 !(sd
->disk
.state
& (1<<MD_DISK_SYNC
))) {
2404 /* some kernels have a bug where you cannot
2405 * use '0' on spare devices. */
2406 sysfs_set_num(sra
, sd
, "size",
2407 (sra
->component_size
+ after
)/2);
2409 err
= sysfs_set_num(sra
, sd
, "new_offset",
2413 if (errno
== E2BIG
&& data_offset
!= INVALID_SECTORS
) {
2414 pr_err("data-offset is too big for %s\n",
2418 if (sd
== sra
->devs
&&
2419 (errno
== ENOENT
|| errno
== E2BIG
))
2420 /* Early kernel, no 'new_offset' file,
2421 * or kernel doesn't like us.
2422 * For RAID5/6 this is not fatal
2425 pr_err("Cannot set new_offset for %s\n",
2434 /* Just use a backup file */
2438 static int raid10_reshape(char *container
, int fd
, char *devname
,
2439 struct supertype
*st
, struct mdinfo
*info
,
2440 struct reshape
*reshape
,
2441 unsigned long long data_offset
,
2442 int force
, int verbose
)
2444 /* Changing raid_disks, layout, chunksize or possibly
2445 * just data_offset for a RAID10.
2446 * We must always change data_offset. We change by at least
2447 * ->min_offset_change which is the largest of the old and new
2449 * If raid_disks is increasing, then data_offset must decrease
2450 * by at least this copy size.
2451 * If raid_disks is unchanged, data_offset must increase or
2452 * decrease by at least min_offset_change but preferably by much more.
2453 * We choose half of the available space.
2454 * If raid_disks is decreasing, data_offset must increase by
2455 * at least min_offset_change. To allow of this, component_size
2456 * must be decreased by the same amount.
2458 * So we calculate the required minimum and direction, possibly
2459 * reduce the component_size, then iterate through the devices
2460 * and set the new_data_offset.
2461 * If that all works, we set chunk_size, layout, raid_disks, and start
2465 unsigned long long min
;
2468 sra
= sysfs_read(fd
, NULL
,
2469 GET_COMPONENT
|GET_DEVS
|GET_OFFSET
|GET_STATE
|GET_CHUNK
2472 pr_err("%s: Cannot get array details from sysfs\n",
2476 min
= reshape
->min_offset_change
;
2478 if (info
->delta_disks
)
2479 sysfs_set_str(sra
, NULL
, "reshape_direction",
2480 info
->delta_disks
< 0 ? "backwards" : "forwards");
2481 if (info
->delta_disks
< 0 &&
2482 info
->space_after
< min
) {
2483 int rv
= sysfs_set_num(sra
, NULL
, "component_size",
2484 (sra
->component_size
-
2487 pr_err("cannot reduce component size\n");
2491 err
= set_new_data_offset(sra
, st
, devname
, info
->delta_disks
, data_offset
,
2494 pr_err("Cannot set new_data_offset: RAID10 reshape not\n");
2495 cont_err("supported on this kernel\n");
2501 if (!err
&& sysfs_set_num(sra
, NULL
, "chunk_size", info
->new_chunk
) < 0)
2503 if (!err
&& sysfs_set_num(sra
, NULL
, "layout", reshape
->after
.layout
) < 0)
2505 if (!err
&& sysfs_set_num(sra
, NULL
, "raid_disks",
2506 info
->array
.raid_disks
+ info
->delta_disks
) < 0)
2508 if (!err
&& sysfs_set_str(sra
, NULL
, "sync_action", "reshape") < 0)
2511 pr_err("Cannot set array shape for %s\n",
2514 (info
->array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2515 cont_err(" Bitmap must be removed before shape can be changed\n");
2525 static void get_space_after(int fd
, struct supertype
*st
, struct mdinfo
*info
)
2527 struct mdinfo
*sra
, *sd
;
2528 /* Initialisation to silence compiler warning */
2529 unsigned long long min_space_before
= 0, min_space_after
= 0;
2532 sra
= sysfs_read(fd
, NULL
, GET_DEVS
);
2535 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
2538 struct supertype
*st2
;
2539 struct mdinfo info2
;
2541 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
2543 dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 0);
2544 dfd
= dev_open(dn
, O_RDONLY
);
2547 st2
= dup_super(st
);
2548 if (st2
->ss
->load_super(st2
,dfd
, NULL
)) {
2554 st2
->ss
->getinfo_super(st2
, &info2
, NULL
);
2555 st2
->ss
->free_super(st2
);
2558 min_space_before
> info2
.space_before
)
2559 min_space_before
= info2
.space_before
;
2561 min_space_after
> info2
.space_after
)
2562 min_space_after
= info2
.space_after
;
2565 if (sd
== NULL
&& !first
) {
2566 info
->space_after
= min_space_after
;
2567 info
->space_before
= min_space_before
;
2572 static void update_cache_size(char *container
, struct mdinfo
*sra
,
2573 struct mdinfo
*info
,
2574 int disks
, unsigned long long blocks
)
2576 /* Check that the internal stripe cache is
2577 * large enough, or it won't work.
2578 * It must hold at least 4 stripes of the larger
2581 unsigned long cache
;
2582 cache
= max(info
->array
.chunk_size
, info
->new_chunk
);
2583 cache
*= 4; /* 4 stripes minimum */
2584 cache
/= 512; /* convert to sectors */
2585 /* make sure there is room for 'blocks' with a bit to spare */
2586 if (cache
< 16 + blocks
/ disks
)
2587 cache
= 16 + blocks
/ disks
;
2588 cache
/= (4096/512); /* Convert from sectors to pages */
2590 if (sra
->cache_size
< cache
)
2591 subarray_set_num(container
, sra
, "stripe_cache_size",
2595 static int impose_reshape(struct mdinfo
*sra
,
2596 struct mdinfo
*info
,
2597 struct supertype
*st
,
2600 char *devname
, char *container
,
2601 struct reshape
*reshape
)
2603 struct mdu_array_info_s array
;
2605 sra
->new_chunk
= info
->new_chunk
;
2608 /* for external metadata checkpoint saved by mdmon can be lost
2609 * or missed /due to e.g. crash/. Check if md is not during
2610 * restart farther than metadata points to.
2611 * If so, this means metadata information is obsolete.
2613 if (st
->ss
->external
)
2614 verify_reshape_position(info
, reshape
->level
);
2615 sra
->reshape_progress
= info
->reshape_progress
;
2617 sra
->reshape_progress
= 0;
2618 if (reshape
->after
.data_disks
< reshape
->before
.data_disks
)
2619 /* start from the end of the new array */
2620 sra
->reshape_progress
= (sra
->component_size
2621 * reshape
->after
.data_disks
);
2624 ioctl(fd
, GET_ARRAY_INFO
, &array
);
2625 if (info
->array
.chunk_size
== info
->new_chunk
&&
2626 reshape
->before
.layout
== reshape
->after
.layout
&&
2627 st
->ss
->external
== 0) {
2628 /* use SET_ARRAY_INFO but only if reshape hasn't started */
2629 array
.raid_disks
= reshape
->after
.data_disks
+ reshape
->parity
;
2631 ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
2634 pr_err("Cannot set device shape for %s: %s\n",
2635 devname
, strerror(errno
));
2638 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2639 cont_err("Bitmap must be removed before shape can be changed\n");
2643 } else if (!restart
) {
2644 /* set them all just in case some old 'new_*' value
2645 * persists from some earlier problem.
2648 if (sysfs_set_num(sra
, NULL
, "chunk_size", info
->new_chunk
) < 0)
2650 if (!err
&& sysfs_set_num(sra
, NULL
, "layout",
2651 reshape
->after
.layout
) < 0)
2653 if (!err
&& subarray_set_num(container
, sra
, "raid_disks",
2654 reshape
->after
.data_disks
+
2655 reshape
->parity
) < 0)
2658 pr_err("Cannot set device shape for %s\n",
2662 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2663 cont_err("Bitmap must be removed before shape can be changed\n");
2672 static int impose_level(int fd
, int level
, char *devname
, int verbose
)
2675 struct mdu_array_info_s array
;
2677 sysfs_init(&info
, fd
, NULL
);
2679 ioctl(fd
, GET_ARRAY_INFO
, &array
);
2681 (array
.level
>= 4 && array
.level
<= 6)) {
2682 /* To convert to RAID0 we need to fail and
2683 * remove any non-data devices. */
2686 int data_disks
= array
.raid_disks
- 1;
2687 if (array
.level
== 6)
2689 if (array
.level
== 5 &&
2690 array
.layout
!= ALGORITHM_PARITY_N
)
2692 if (array
.level
== 6 &&
2693 array
.layout
!= ALGORITHM_PARITY_N_6
)
2695 sysfs_set_str(&info
, NULL
,"sync_action", "idle");
2696 /* First remove any spares so no recovery starts */
2697 for (d
= 0, found
= 0;
2698 d
< MAX_DISKS
&& found
< array
.nr_disks
;
2700 mdu_disk_info_t disk
;
2702 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
2704 if (disk
.major
== 0 && disk
.minor
== 0)
2707 if ((disk
.state
& (1 << MD_DISK_ACTIVE
))
2708 && disk
.raid_disk
< data_disks
)
2711 ioctl(fd
, HOT_REMOVE_DISK
,
2712 makedev(disk
.major
, disk
.minor
));
2714 /* Now fail anything left */
2715 ioctl(fd
, GET_ARRAY_INFO
, &array
);
2716 for (d
= 0, found
= 0;
2717 d
< MAX_DISKS
&& found
< array
.nr_disks
;
2720 mdu_disk_info_t disk
;
2722 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
2724 if (disk
.major
== 0 && disk
.minor
== 0)
2727 if ((disk
.state
& (1 << MD_DISK_ACTIVE
))
2728 && disk
.raid_disk
< data_disks
)
2731 ioctl(fd
, SET_DISK_FAULTY
,
2732 makedev(disk
.major
, disk
.minor
));
2734 while (ioctl(fd
, HOT_REMOVE_DISK
,
2735 makedev(disk
.major
, disk
.minor
)) < 0
2742 c
= map_num(pers
, level
);
2744 int err
= sysfs_set_str(&info
, NULL
, "level", c
);
2747 pr_err("%s: could not set level to %s\n",
2750 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2751 cont_err("Bitmap must be removed before level can be changed\n");
2755 pr_err("level of %s changed to %s\n",
2762 static void catch_term(int sig
)
2767 static int continue_via_systemd(char *devnm
)
2769 int skipped
, i
, pid
, status
;
2771 /* In a systemd/udev world, it is best to get systemd to
2772 * run "mdadm --grow --continue" rather than running in the
2777 /* FIXME yuk. CLOSE_EXEC?? */
2779 for (i
= 3; skipped
< 20; i
++)
2785 /* Don't want to see error messages from
2786 * systemctl. If the service doesn't exist,
2787 * we fork ourselves.
2790 open("/dev/null", O_WRONLY
);
2791 snprintf(pathbuf
, sizeof(pathbuf
), "mdadm-grow-continue@%s.service",
2793 status
= execl("/usr/bin/systemctl", "systemctl",
2796 status
= execl("/bin/systemctl", "systemctl", "start",
2799 case -1: /* Just do it ourselves. */
2801 default: /* parent - good */
2802 pid
= wait(&status
);
2803 if (pid
>= 0 && status
== 0)
2809 static int reshape_array(char *container
, int fd
, char *devname
,
2810 struct supertype
*st
, struct mdinfo
*info
,
2811 int force
, struct mddev_dev
*devlist
,
2812 unsigned long long data_offset
,
2813 char *backup_file
, int verbose
, int forked
,
2814 int restart
, int freeze_reshape
)
2816 struct reshape reshape
;
2819 int orig_level
= UnSet
;
2823 struct mdu_array_info_s array
;
2826 struct mddev_dev
*dv
;
2830 unsigned long long *offsets
= NULL
;
2834 unsigned long blocks
;
2835 unsigned long long array_size
;
2837 struct mdinfo
*sra
= NULL
;
2840 /* when reshaping a RAID0, the component_size might be zero.
2841 * So try to fix that up.
2843 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) != 0) {
2844 dprintf("Cannot get array information.\n");
2847 if (array
.level
== 0 && info
->component_size
== 0) {
2848 get_dev_size(fd
, NULL
, &array_size
);
2849 info
->component_size
= array_size
/ array
.raid_disks
;
2852 if (array
.level
== 10)
2853 /* Need space_after info */
2854 get_space_after(fd
, st
, info
);
2856 if (info
->reshape_active
) {
2857 int new_level
= info
->new_level
;
2858 info
->new_level
= UnSet
;
2859 if (info
->delta_disks
> 0)
2860 info
->array
.raid_disks
-= info
->delta_disks
;
2861 msg
= analyse_change(devname
, info
, &reshape
);
2862 info
->new_level
= new_level
;
2863 if (info
->delta_disks
> 0)
2864 info
->array
.raid_disks
+= info
->delta_disks
;
2866 /* Make sure the array isn't read-only */
2867 ioctl(fd
, RESTART_ARRAY_RW
, 0);
2869 msg
= analyse_change(devname
, info
, &reshape
);
2871 /* if msg == "", error has already been printed */
2873 pr_err("%s\n", msg
);
2877 (reshape
.level
!= info
->array
.level
||
2878 reshape
.before
.layout
!= info
->array
.layout
||
2879 reshape
.before
.data_disks
+ reshape
.parity
2880 != info
->array
.raid_disks
- max(0, info
->delta_disks
))) {
2881 pr_err("reshape info is not in native format - cannot continue.\n");
2885 if (st
->ss
->external
&& restart
&& (info
->reshape_progress
== 0) &&
2886 !((sysfs_get_str(info
, NULL
, "sync_action", buf
, sizeof(buf
)) > 0) &&
2887 (strncmp(buf
, "reshape", 7) == 0))) {
2888 /* When reshape is restarted from '0', very begin of array
2889 * it is possible that for external metadata reshape and array
2890 * configuration doesn't happen.
2891 * Check if md has the same opinion, and reshape is restarted
2892 * from 0. If so, this is regular reshape start after reshape
2893 * switch in metadata to next array only.
2895 if ((verify_reshape_position(info
, reshape
.level
) >= 0) &&
2896 (info
->reshape_progress
== 0))
2900 /* reshape already started. just skip to monitoring the reshape */
2901 if (reshape
.backup_blocks
== 0)
2903 if (restart
& RESHAPE_NO_BACKUP
)
2906 /* Need 'sra' down at 'started:' */
2907 sra
= sysfs_read(fd
, NULL
,
2908 GET_COMPONENT
|GET_DEVS
|GET_OFFSET
|GET_STATE
|GET_CHUNK
|
2911 pr_err("%s: Cannot get array details from sysfs\n",
2917 backup_file
= locate_backup(sra
->sys_name
);
2921 /* The container is frozen but the array may not be.
2922 * So freeze the array so spares don't get put to the wrong use
2923 * FIXME there should probably be a cleaner separation between
2924 * freeze_array and freeze_container.
2926 sysfs_freeze_array(info
);
2927 /* Check we have enough spares to not be degraded */
2929 for (dv
= devlist
; dv
; dv
=dv
->next
)
2931 spares_needed
= max(reshape
.before
.data_disks
,
2932 reshape
.after
.data_disks
)
2933 + reshape
.parity
- array
.raid_disks
;
2936 info
->new_level
> 1 && info
->array
.level
> 1 &&
2937 spares_needed
> info
->array
.spare_disks
+ added_disks
) {
2938 pr_err("Need %d spare%s to avoid degraded array, and only have %d.\n"
2939 " Use --force to over-ride this check.\n",
2941 spares_needed
== 1 ? "" : "s",
2942 info
->array
.spare_disks
+ added_disks
);
2945 /* Check we have enough spares to not fail */
2946 spares_needed
= max(reshape
.before
.data_disks
,
2947 reshape
.after
.data_disks
)
2949 if ((info
->new_level
> 1 || info
->new_level
== 0) &&
2950 spares_needed
> info
->array
.spare_disks
+added_disks
) {
2951 pr_err("Need %d spare%s to create working array, and only have %d.\n",
2953 spares_needed
== 1 ? "" : "s",
2954 info
->array
.spare_disks
+ added_disks
);
2958 if (reshape
.level
!= array
.level
) {
2959 int err
= impose_level(fd
, reshape
.level
, devname
, verbose
);
2962 info
->new_layout
= UnSet
; /* after level change,
2963 * layout is meaningless */
2964 orig_level
= array
.level
;
2965 sysfs_freeze_array(info
);
2967 if (reshape
.level
> 0 && st
->ss
->external
) {
2968 /* make sure mdmon is aware of the new level */
2969 if (mdmon_running(container
))
2970 flush_mdmon(container
);
2972 if (!mdmon_running(container
))
2973 start_mdmon(container
);
2974 ping_monitor(container
);
2975 if (mdmon_running(container
) &&
2976 st
->update_tail
== NULL
)
2977 st
->update_tail
= &st
->updates
;
2980 /* ->reshape_super might have chosen some spares from the
2981 * container that it wants to be part of the new array.
2982 * We can collect them with ->container_content and give
2983 * them to the kernel.
2985 if (st
->ss
->reshape_super
&& st
->ss
->container_content
) {
2986 char *subarray
= strchr(info
->text_version
+1, '/')+1;
2987 struct mdinfo
*info2
=
2988 st
->ss
->container_content(st
, subarray
);
2992 sysfs_init(info2
, fd
, st
->devnm
);
2993 /* When increasing number of devices, we need to set
2994 * new raid_disks before adding these, or they might
2997 if (reshape
.backup_blocks
&&
2998 reshape
.after
.data_disks
> reshape
.before
.data_disks
)
2999 subarray_set_num(container
, info2
, "raid_disks",
3000 reshape
.after
.data_disks
+
3002 for (d
= info2
->devs
; d
; d
= d
->next
) {
3003 if (d
->disk
.state
== 0 &&
3004 d
->disk
.raid_disk
>= 0) {
3005 /* This is a spare that wants to
3006 * be part of the array.
3008 add_disk(fd
, st
, info2
, d
);
3014 /* We might have been given some devices to add to the
3015 * array. Now that the array has been changed to the right
3016 * level and frozen, we can safely add them.
3019 if (Manage_subdevs(devname
, fd
, devlist
, verbose
,
3024 if (reshape
.backup_blocks
== 0 && data_offset
!= INVALID_SECTORS
)
3025 reshape
.backup_blocks
= reshape
.before
.data_disks
* info
->array
.chunk_size
/512;
3026 if (reshape
.backup_blocks
== 0) {
3027 /* No restriping needed, but we might need to impose
3028 * some more changes: layout, raid_disks, chunk_size
3030 /* read current array info */
3031 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) != 0) {
3032 dprintf("Cannot get array information.\n");
3035 /* compare current array info with new values and if
3036 * it is different update them to new */
3037 if (info
->new_layout
!= UnSet
&&
3038 info
->new_layout
!= array
.layout
) {
3039 array
.layout
= info
->new_layout
;
3040 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
3041 pr_err("failed to set new layout\n");
3043 } else if (verbose
>= 0)
3044 printf("layout for %s set to %d\n",
3045 devname
, array
.layout
);
3047 if (info
->delta_disks
!= UnSet
&&
3048 info
->delta_disks
!= 0 &&
3049 array
.raid_disks
!= (info
->array
.raid_disks
+ info
->delta_disks
)) {
3050 array
.raid_disks
+= info
->delta_disks
;
3051 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
3052 pr_err("failed to set raid disks\n");
3054 } else if (verbose
>= 0) {
3055 printf("raid_disks for %s set to %d\n",
3056 devname
, array
.raid_disks
);
3059 if (info
->new_chunk
!= 0 &&
3060 info
->new_chunk
!= array
.chunk_size
) {
3061 if (sysfs_set_num(info
, NULL
,
3062 "chunk_size", info
->new_chunk
) != 0) {
3063 pr_err("failed to set chunk size\n");
3065 } else if (verbose
>= 0)
3066 printf("chunk size for %s set to %d\n",
3067 devname
, array
.chunk_size
);
3074 * There are three possibilities.
3075 * 1/ The array will shrink.
3076 * We need to ensure the reshape will pause before reaching
3077 * the 'critical section'. We also need to fork and wait for
3078 * that to happen. When it does we
3079 * suspend/backup/complete/unfreeze
3081 * 2/ The array will not change size.
3082 * This requires that we keep a backup of a sliding window
3083 * so that we can restore data after a crash. So we need
3084 * to fork and monitor progress.
3085 * In future we will allow the data_offset to change, so
3086 * a sliding backup becomes unnecessary.
3088 * 3/ The array will grow. This is relatively easy.
3089 * However the kernel's restripe routines will cheerfully
3090 * overwrite some early data before it is safe. So we
3091 * need to make a backup of the early parts of the array
3092 * and be ready to restore it if rebuild aborts very early.
3093 * For externally managed metadata, we still need a forked
3094 * child to monitor the reshape and suspend IO over the region
3095 * that is being reshaped.
3097 * We backup data by writing it to one spare, or to a
3098 * file which was given on command line.
3100 * In each case, we first make sure that storage is available
3101 * for the required backup.
3103 * - request the shape change.
3104 * - fork to handle backup etc.
3106 /* Check that we can hold all the data */
3107 get_dev_size(fd
, NULL
, &array_size
);
3108 if (reshape
.new_size
< (array_size
/512)) {
3109 pr_err("this change will reduce the size of the array.\n"
3110 " use --grow --array-size first to truncate array.\n"
3111 " e.g. mdadm --grow %s --array-size %llu\n",
3112 devname
, reshape
.new_size
/2);
3116 if (array
.level
== 10) {
3117 /* Reshaping RAID10 does not require any data backup by
3118 * user-space. Instead it requires that the data_offset
3119 * is changed to avoid the need for backup.
3120 * So this is handled very separately
3123 /* Nothing to do. */
3125 return raid10_reshape(container
, fd
, devname
, st
, info
,
3126 &reshape
, data_offset
,
3129 sra
= sysfs_read(fd
, NULL
,
3130 GET_COMPONENT
|GET_DEVS
|GET_OFFSET
|GET_STATE
|GET_CHUNK
|
3133 pr_err("%s: Cannot get array details from sysfs\n",
3139 switch(set_new_data_offset(sra
, st
, devname
,
3140 reshape
.after
.data_disks
- reshape
.before
.data_disks
,
3142 reshape
.min_offset_change
, 1)) {
3146 /* Updated data_offset, so it's easy now */
3147 update_cache_size(container
, sra
, info
,
3148 min(reshape
.before
.data_disks
,
3149 reshape
.after
.data_disks
),
3150 reshape
.backup_blocks
);
3152 /* Right, everything seems fine. Let's kick things off.
3156 if (impose_reshape(sra
, info
, st
, fd
, restart
,
3157 devname
, container
, &reshape
) < 0)
3159 if (sysfs_set_str(sra
, NULL
, "sync_action", "reshape") < 0) {
3161 if (errno
!= EINVAL
) {
3162 pr_err("Failed to initiate reshape!\n");
3165 /* revert data_offset and try the old way */
3166 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
3167 sysfs_set_num(sra
, sd
, "new_offset",
3169 sysfs_set_str(sra
, NULL
, "reshape_direction",
3174 if (info
->new_level
== reshape
.level
)
3176 /* need to adjust level when reshape completes */
3178 case -1: /* ignore error, but don't wait */
3180 default: /* parent */
3188 fd
= open_dev(sra
->sys_name
);
3190 impose_level(fd
, info
->new_level
, devname
, verbose
);
3192 case 1: /* Couldn't set data_offset, try the old way */
3193 if (data_offset
!= INVALID_SECTORS
) {
3194 pr_err("Cannot update data_offset on this array\n");
3201 /* Decide how many blocks (sectors) for a reshape
3202 * unit. The number we have so far is just a minimum
3204 blocks
= reshape
.backup_blocks
;
3205 if (reshape
.before
.data_disks
==
3206 reshape
.after
.data_disks
) {
3207 /* Make 'blocks' bigger for better throughput, but
3208 * not so big that we reject it below.
3209 * Try for 16 megabytes
3211 while (blocks
* 32 < sra
->component_size
&&
3215 pr_err("Need to backup %luK of critical section..\n", blocks
/2);
3217 if (blocks
>= sra
->component_size
/2) {
3218 pr_err("%s: Something wrong - reshape aborted\n",
3223 /* Now we need to open all these devices so we can read/write.
3225 nrdisks
= max(reshape
.before
.data_disks
,
3226 reshape
.after
.data_disks
) + reshape
.parity
3227 + sra
->array
.spare_disks
;
3228 fdlist
= xcalloc((1+nrdisks
), sizeof(int));
3229 offsets
= xcalloc((1+nrdisks
), sizeof(offsets
[0]));
3231 odisks
= reshape
.before
.data_disks
+ reshape
.parity
;
3232 d
= reshape_prepare_fdlist(devname
, sra
, odisks
,
3233 nrdisks
, blocks
, backup_file
,
3238 if ((st
->ss
->manage_reshape
== NULL
) ||
3239 (st
->ss
->recover_backup
== NULL
)) {
3240 if (backup_file
== NULL
) {
3241 if (reshape
.after
.data_disks
<=
3242 reshape
.before
.data_disks
) {
3243 pr_err("%s: Cannot grow - need backup-file\n",
3245 pr_err(" Please provide one with \"--backup=...\"\n");
3247 } else if (d
== odisks
) {
3248 pr_err("%s: Cannot grow - need a spare or backup-file to backup critical section\n", devname
);
3252 if (!reshape_open_backup_file(backup_file
, fd
, devname
,
3254 fdlist
+d
, offsets
+d
,
3263 update_cache_size(container
, sra
, info
,
3264 min(reshape
.before
.data_disks
, reshape
.after
.data_disks
),
3267 /* Right, everything seems fine. Let's kick things off.
3268 * If only changing raid_disks, use ioctl, else use
3273 if (impose_reshape(sra
, info
, st
, fd
, restart
,
3274 devname
, container
, &reshape
) < 0)
3277 err
= start_reshape(sra
, restart
, reshape
.before
.data_disks
,
3278 reshape
.after
.data_disks
);
3280 pr_err("Cannot %s reshape for %s\n",
3281 restart
? "continue" : "start",
3286 sysfs_set_str(sra
, NULL
, "array_state", "active");
3287 if (freeze_reshape
) {
3291 pr_err("Reshape has to be continued from location %llu when root filesystem has been mounted.\n",
3292 sra
->reshape_progress
);
3296 if (!forked
&& !check_env("MDADM_NO_SYSTEMCTL"))
3297 if (continue_via_systemd(container
?: sra
->sys_name
)) {
3304 /* Now we just need to kick off the reshape and watch, while
3305 * handling backups of the data...
3306 * This is all done by a forked background process.
3308 switch(forked
? 0 : fork()) {
3310 pr_err("Cannot run child to monitor reshape: %s\n",
3324 /* If another array on the same devices is busy, the
3325 * reshape will wait for them. This would mean that
3326 * the first section that we suspend will stay suspended
3327 * for a long time. So check on that possibility
3328 * by looking for "DELAYED" in /proc/mdstat, and if found,
3332 struct mdstat_ent
*mds
, *m
;
3334 mds
= mdstat_read(1, 0);
3335 for (m
= mds
; m
; m
= m
->next
)
3336 if (strcmp(m
->devnm
, sra
->sys_name
) == 0) {
3338 m
->percent
== RESYNC_DELAYED
)
3341 /* Haven't started the reshape thread
3348 if (delayed
== 1 && get_linux_version() < 3007000) {
3349 pr_err("Reshape is delayed, but cannot wait carefully with this kernel.\n"
3350 " You might experience problems until other reshapes complete.\n");
3354 mdstat_wait(30 - (delayed
-1) * 25);
3358 if (check_env("MDADM_GROW_VERIFY"))
3359 fd
= open(devname
, O_RDONLY
| O_DIRECT
);
3362 mlockall(MCL_FUTURE
);
3364 signal(SIGTERM
, catch_term
);
3366 if (st
->ss
->external
) {
3367 /* metadata handler takes it from here */
3368 done
= st
->ss
->manage_reshape(
3369 fd
, sra
, &reshape
, st
, blocks
,
3371 d
- odisks
, fdlist
+odisks
,
3374 done
= child_monitor(
3375 fd
, sra
, &reshape
, st
, blocks
,
3377 d
- odisks
, fdlist
+odisks
,
3383 if (backup_file
&& done
) {
3385 bul
= make_backup(sra
->sys_name
);
3388 int l
= readlink(bul
, buf
, sizeof(buf
) - 1);
3396 unlink(backup_file
);
3403 if (!st
->ss
->external
&&
3404 !(reshape
.before
.data_disks
!= reshape
.after
.data_disks
3405 && info
->custom_array_size
) &&
3406 info
->new_level
== reshape
.level
&&
3408 /* no need to wait for the reshape to finish as
3409 * there is nothing more to do.
3416 if (st
->ss
->external
) {
3417 /* Re-load the metadata as much could have changed */
3418 int cfd
= open_dev(st
->container_devnm
);
3420 flush_mdmon(container
);
3421 st
->ss
->free_super(st
);
3422 st
->ss
->load_container(st
, cfd
, container
);
3427 /* set new array size if required customer_array_size is used
3430 if (reshape
.before
.data_disks
!=
3431 reshape
.after
.data_disks
&&
3432 info
->custom_array_size
)
3433 set_array_size(st
, info
, info
->text_version
);
3435 if (info
->new_level
!= reshape
.level
) {
3437 fd
= open(devname
, O_RDONLY
);
3438 impose_level(fd
, info
->new_level
, devname
, verbose
);
3440 if (info
->new_level
== 0)
3441 st
->update_tail
= NULL
;
3453 if (orig_level
!= UnSet
&& sra
) {
3454 c
= map_num(pers
, orig_level
);
3455 if (c
&& sysfs_set_str(sra
, NULL
, "level", c
) == 0)
3456 pr_err("aborting level change\n");
3464 /* mdfd handle is passed to be closed in child process (after fork).
3466 int reshape_container(char *container
, char *devname
,
3468 struct supertype
*st
,
3469 struct mdinfo
*info
,
3471 char *backup_file
, int verbose
,
3472 int forked
, int restart
, int freeze_reshape
)
3474 struct mdinfo
*cc
= NULL
;
3476 char last_devnm
[32] = "";
3478 /* component_size is not meaningful for a container,
3479 * so pass '0' meaning 'no change'
3482 reshape_super(st
, 0, info
->new_level
,
3483 info
->new_layout
, info
->new_chunk
,
3484 info
->array
.raid_disks
, info
->delta_disks
,
3485 backup_file
, devname
, APPLY_METADATA_CHANGES
,
3493 /* ping monitor to be sure that update is on disk
3495 ping_monitor(container
);
3497 if (!forked
&& !freeze_reshape
&& !check_env("MDADM_NO_SYSTEMCTL"))
3498 if (continue_via_systemd(container
))
3501 switch (forked
? 0 : fork()) {
3502 case -1: /* error */
3503 perror("Cannot fork to complete reshape\n");
3506 default: /* parent */
3507 if (!freeze_reshape
)
3508 printf("%s: multi-array reshape continues in background\n", Name
);
3515 /* close unused handle in child process
3521 /* For each member array with reshape_active,
3522 * we need to perform the reshape.
3523 * We pick the first array that needs reshaping and
3524 * reshape it. reshape_array() will re-read the metadata
3525 * so the next time through a different array should be
3526 * ready for reshape.
3527 * It is possible that the 'different' array will not
3528 * be assembled yet. In that case we simple exit.
3529 * When it is assembled, the mdadm which assembles it
3530 * will take over the reshape.
3532 struct mdinfo
*content
;
3534 struct mdstat_ent
*mdstat
;
3540 cc
= st
->ss
->container_content(st
, NULL
);
3542 for (content
= cc
; content
; content
= content
->next
) {
3544 if (!content
->reshape_active
)
3547 subarray
= strchr(content
->text_version
+1, '/')+1;
3548 mdstat
= mdstat_by_subdev(subarray
, container
);
3551 if (mdstat
->active
== 0) {
3552 pr_err("Skipping inactive array %s.\n",
3554 free_mdstat(mdstat
);
3563 devid
= devnm2devid(mdstat
->devnm
);
3564 adev
= map_dev(major(devid
), minor(devid
), 0);
3566 adev
= content
->text_version
;
3568 fd
= open_dev(mdstat
->devnm
);
3570 pr_err("Device %s cannot be opened for reshape.\n", adev
);
3574 if (strcmp(last_devnm
, mdstat
->devnm
) == 0) {
3575 /* Do not allow for multiple reshape_array() calls for
3577 * It can happen when reshape_array() returns without
3578 * error, when reshape is not finished (wrong reshape
3579 * starting/continuation conditions). Mdmon doesn't
3580 * switch to next array in container and reentry
3581 * conditions for the same array occur.
3582 * This is possibly interim until the behaviour of
3583 * reshape_array is resolved().
3585 printf("%s: Multiple reshape execution detected for device %s.\n", Name
, adev
);
3589 strcpy(last_devnm
, mdstat
->devnm
);
3591 sysfs_init(content
, fd
, mdstat
->devnm
);
3593 if (mdmon_running(container
))
3594 flush_mdmon(container
);
3596 rv
= reshape_array(container
, fd
, adev
, st
,
3597 content
, force
, NULL
, INVALID_SECTORS
,
3598 backup_file
, verbose
, 1, restart
,
3602 if (freeze_reshape
) {
3611 if (mdmon_running(container
))
3612 flush_mdmon(container
);
3621 * We run a child process in the background which performs the following
3623 * - wait for resync to reach a certain point
3624 * - suspend io to the following section
3625 * - backup that section
3626 * - allow resync to proceed further
3628 * - discard the backup.
3630 * When are combined in slightly different ways in the three cases.
3632 * - suspend/backup/allow/wait/resume/discard
3634 * - allow/wait/suspend/backup/allow/wait/resume/discard
3636 * - wait/resume/discard/suspend/backup/allow
3638 * suspend/backup/allow always come together
3639 * wait/resume/discard do too.
3640 * For the same-size case we have two backups to improve flow.
3644 int progress_reshape(struct mdinfo
*info
, struct reshape
*reshape
,
3645 unsigned long long backup_point
,
3646 unsigned long long wait_point
,
3647 unsigned long long *suspend_point
,
3648 unsigned long long *reshape_completed
, int *frozen
)
3650 /* This function is called repeatedly by the reshape manager.
3651 * It determines how much progress can safely be made and allows
3653 * - 'info' identifies the array and particularly records in
3654 * ->reshape_progress the metadata's knowledge of progress
3655 * This is a sector offset from the start of the array
3656 * of the next array block to be relocated. This number
3657 * may increase from 0 or decrease from array_size, depending
3658 * on the type of reshape that is happening.
3659 * Note that in contrast, 'sync_completed' is a block count of the
3660 * reshape so far. It gives the distance between the start point
3661 * (head or tail of device) and the next place that data will be
3662 * written. It always increases.
3663 * - 'reshape' is the structure created by analyse_change
3664 * - 'backup_point' shows how much the metadata manager has backed-up
3665 * data. For reshapes with increasing progress, it is the next address
3666 * to be backed up, previous addresses have been backed-up. For
3667 * decreasing progress, it is the earliest address that has been
3668 * backed up - later address are also backed up.
3669 * So addresses between reshape_progress and backup_point are
3670 * backed up providing those are in the 'correct' order.
3671 * - 'wait_point' is an array address. When reshape_completed
3672 * passes this point, progress_reshape should return. It might
3673 * return earlier if it determines that ->reshape_progress needs
3674 * to be updated or further backup is needed.
3675 * - suspend_point is maintained by progress_reshape and the caller
3676 * should not touch it except to initialise to zero.
3677 * It is an array address and it only increases in 2.6.37 and earlier.
3678 * This makes it difficult to handle reducing reshapes with
3679 * external metadata.
3680 * However: it is similar to backup_point in that it records the
3681 * other end of a suspended region from reshape_progress.
3682 * it is moved to extend the region that is safe to backup and/or
3684 * - reshape_completed is read from sysfs and returned. The caller
3685 * should copy this into ->reshape_progress when it has reason to
3686 * believe that the metadata knows this, and any backup outside this
3690 * 1 if more data from backup_point - but only as far as suspend_point,
3691 * should be backed up
3692 * 0 if things are progressing smoothly
3693 * -1 if the reshape is finished because it is all done,
3694 * -2 if the reshape is finished due to an error.
3697 int advancing
= (reshape
->after
.data_disks
3698 >= reshape
->before
.data_disks
);
3699 unsigned long long need_backup
; /* All data between start of array and
3700 * here will at some point need to
3703 unsigned long long read_offset
, write_offset
;
3704 unsigned long long write_range
;
3705 unsigned long long max_progress
, target
, completed
;
3706 unsigned long long array_size
= (info
->component_size
3707 * reshape
->before
.data_disks
);
3711 /* First, we unsuspend any region that is now known to be safe.
3712 * If suspend_point is on the 'wrong' side of reshape_progress, then
3713 * we don't have or need suspension at the moment. This is true for
3714 * native metadata when we don't need to back-up.
3717 if (info
->reshape_progress
<= *suspend_point
)
3718 sysfs_set_num(info
, NULL
, "suspend_lo",
3719 info
->reshape_progress
);
3721 /* Note: this won't work in 2.6.37 and before.
3722 * Something somewhere should make sure we don't need it!
3724 if (info
->reshape_progress
>= *suspend_point
)
3725 sysfs_set_num(info
, NULL
, "suspend_hi",
3726 info
->reshape_progress
);
3729 /* Now work out how far it is safe to progress.
3730 * If the read_offset for ->reshape_progress is less than
3731 * 'blocks' beyond the write_offset, we can only progress as far
3733 * Otherwise we can progress until the write_offset for the new location
3734 * reaches (within 'blocks' of) the read_offset at the current location.
3735 * However that region must be suspended unless we are using native
3737 * If we need to suspend more, we limit it to 128M per device, which is
3738 * rather arbitrary and should be some time-based calculation.
3740 read_offset
= info
->reshape_progress
/ reshape
->before
.data_disks
;
3741 write_offset
= info
->reshape_progress
/ reshape
->after
.data_disks
;
3742 write_range
= info
->new_chunk
/512;
3743 if (reshape
->before
.data_disks
== reshape
->after
.data_disks
)
3744 need_backup
= array_size
;
3746 need_backup
= reshape
->backup_blocks
;
3748 if (read_offset
< write_offset
+ write_range
)
3749 max_progress
= backup_point
;
3753 reshape
->after
.data_disks
;
3755 if (read_offset
> write_offset
- write_range
)
3756 /* Can only progress as far as has been backed up,
3757 * which must be suspended */
3758 max_progress
= backup_point
;
3759 else if (info
->reshape_progress
<= need_backup
)
3760 max_progress
= backup_point
;
3762 if (info
->array
.major_version
>= 0)
3763 /* Can progress until backup is needed */
3764 max_progress
= need_backup
;
3766 /* Can progress until metadata update is required */
3769 reshape
->after
.data_disks
;
3770 /* but data must be suspended */
3771 if (max_progress
< *suspend_point
)
3772 max_progress
= *suspend_point
;
3777 /* We know it is safe to progress to 'max_progress' providing
3778 * it is suspended or we are using native metadata.
3779 * Consider extending suspend_point 128M per device if it
3780 * is less than 64M per device beyond reshape_progress.
3781 * But always do a multiple of 'blocks'
3782 * FIXME this is too big - it takes to long to complete
3785 target
= 64*1024*2 * min(reshape
->before
.data_disks
,
3786 reshape
->after
.data_disks
);
3787 target
/= reshape
->backup_blocks
;
3790 target
*= reshape
->backup_blocks
;
3792 /* For externally managed metadata we always need to suspend IO to
3793 * the area being reshaped so we regularly push suspend_point forward.
3794 * For native metadata we only need the suspend if we are going to do
3798 if ((need_backup
> info
->reshape_progress
3799 || info
->array
.major_version
< 0) &&
3800 *suspend_point
< info
->reshape_progress
+ target
) {
3801 if (need_backup
< *suspend_point
+ 2 * target
)
3802 *suspend_point
= need_backup
;
3803 else if (*suspend_point
+ 2 * target
< array_size
)
3804 *suspend_point
+= 2 * target
;
3806 *suspend_point
= array_size
;
3807 sysfs_set_num(info
, NULL
, "suspend_hi", *suspend_point
);
3808 if (max_progress
> *suspend_point
)
3809 max_progress
= *suspend_point
;
3812 if (info
->array
.major_version
>= 0) {
3813 /* Only need to suspend when about to backup */
3814 if (info
->reshape_progress
< need_backup
* 2 &&
3815 *suspend_point
> 0) {
3817 sysfs_set_num(info
, NULL
, "suspend_lo", 0);
3818 sysfs_set_num(info
, NULL
, "suspend_hi", need_backup
);
3821 /* Need to suspend continually */
3822 if (info
->reshape_progress
< *suspend_point
)
3823 *suspend_point
= info
->reshape_progress
;
3824 if (*suspend_point
+ target
< info
->reshape_progress
)
3825 /* No need to move suspend region yet */;
3827 if (*suspend_point
>= 2 * target
)
3828 *suspend_point
-= 2 * target
;
3831 sysfs_set_num(info
, NULL
, "suspend_lo",
3834 if (max_progress
< *suspend_point
)
3835 max_progress
= *suspend_point
;
3839 /* now set sync_max to allow that progress. sync_max, like
3840 * sync_completed is a count of sectors written per device, so
3841 * we find the difference between max_progress and the start point,
3842 * and divide that by after.data_disks to get a sync_max
3844 * At the same time we convert wait_point to a similar number
3845 * for comparing against sync_completed.
3847 /* scale down max_progress to per_disk */
3848 max_progress
/= reshape
->after
.data_disks
;
3849 /* Round to chunk size as some kernels give an erroneously high number */
3850 max_progress
/= info
->new_chunk
/512;
3851 max_progress
*= info
->new_chunk
/512;
3852 /* And round to old chunk size as the kernel wants that */
3853 max_progress
/= info
->array
.chunk_size
/512;
3854 max_progress
*= info
->array
.chunk_size
/512;
3855 /* Limit progress to the whole device */
3856 if (max_progress
> info
->component_size
)
3857 max_progress
= info
->component_size
;
3858 wait_point
/= reshape
->after
.data_disks
;
3860 /* switch from 'device offset' to 'processed block count' */
3861 max_progress
= info
->component_size
- max_progress
;
3862 wait_point
= info
->component_size
- wait_point
;
3866 sysfs_set_num(info
, NULL
, "sync_max", max_progress
);
3868 /* Now wait. If we have already reached the point that we were
3869 * asked to wait to, don't wait at all, else wait for any change.
3870 * We need to select on 'sync_completed' as that is the place that
3871 * notifications happen, but we are really interested in
3872 * 'reshape_position'
3874 fd
= sysfs_get_fd(info
, NULL
, "sync_completed");
3876 goto check_progress
;
3878 if (sysfs_fd_get_ll(fd
, &completed
) < 0)
3879 goto check_progress
;
3881 while (completed
< max_progress
&& completed
< wait_point
) {
3882 /* Check that sync_action is still 'reshape' to avoid
3883 * waiting forever on a dead array
3886 if (sysfs_get_str(info
, NULL
, "sync_action",
3888 strncmp(action
, "reshape", 7) != 0)
3890 /* Some kernels reset 'sync_completed' to zero
3891 * before setting 'sync_action' to 'idle'.
3892 * So we need these extra tests.
3894 if (completed
== 0 && advancing
3895 && strncmp(action
, "idle", 4) == 0
3896 && info
->reshape_progress
> 0)
3898 if (completed
== 0 && !advancing
3899 && strncmp(action
, "idle", 4) == 0
3900 && info
->reshape_progress
< (info
->component_size
3901 * reshape
->after
.data_disks
))
3903 sysfs_wait(fd
, NULL
);
3904 if (sysfs_fd_get_ll(fd
, &completed
) < 0)
3905 goto check_progress
;
3907 /* Some kernels reset 'sync_completed' to zero,
3908 * we need to have real point we are in md.
3909 * So in that case, read 'reshape_position' from sysfs.
3911 if (completed
== 0) {
3912 unsigned long long reshapep
;
3914 if (sysfs_get_str(info
, NULL
, "sync_action",
3916 strncmp(action
, "idle", 4) == 0 &&
3917 sysfs_get_ll(info
, NULL
,
3918 "reshape_position", &reshapep
) == 0)
3919 *reshape_completed
= reshapep
;
3921 /* some kernels can give an incorrectly high
3922 * 'completed' number, so round down */
3923 completed
/= (info
->new_chunk
/512);
3924 completed
*= (info
->new_chunk
/512);
3925 /* Convert 'completed' back in to a 'progress' number */
3926 completed
*= reshape
->after
.data_disks
;
3928 completed
= (info
->component_size
3929 * reshape
->after
.data_disks
3931 *reshape_completed
= completed
;
3936 /* We return the need_backup flag. Caller will decide
3937 * how much - a multiple of ->backup_blocks up to *suspend_point
3940 return need_backup
> info
->reshape_progress
;
3942 return need_backup
>= info
->reshape_progress
;
3945 /* if we couldn't read a number from sync_completed, then
3946 * either the reshape did complete, or it aborted.
3947 * We can tell which by checking for 'none' in reshape_position.
3948 * If it did abort, then it might immediately restart if it
3949 * it was just a device failure that leaves us degraded but
3952 if (sysfs_get_str(info
, NULL
, "reshape_position", buf
, sizeof(buf
)) < 0
3953 || strncmp(buf
, "none", 4) != 0) {
3954 /* The abort might only be temporary. Wait up to 10
3955 * seconds for fd to contain a valid number again.
3959 unsigned long long new_sync_max
;
3960 while (fd
>= 0 && rv
< 0 && wait
> 0) {
3961 if (sysfs_wait(fd
, &wait
) != 1)
3963 switch (sysfs_fd_get_ll(fd
, &completed
)) {
3965 /* all good again */
3967 /* If "sync_max" is no longer max_progress
3968 * we need to freeze things
3970 sysfs_get_ll(info
, NULL
, "sync_max", &new_sync_max
);
3971 *frozen
= (new_sync_max
!= max_progress
);
3973 case -2: /* read error - abort */
3980 return rv
; /* abort */
3982 /* Maybe racing with array shutdown - check state */
3985 if (sysfs_get_str(info
, NULL
, "array_state", buf
, sizeof(buf
)) < 0
3986 || strncmp(buf
, "inactive", 8) == 0
3987 || strncmp(buf
, "clear",5) == 0)
3988 return -2; /* abort */
3989 return -1; /* complete */
3993 /* FIXME return status is never checked */
3994 static int grow_backup(struct mdinfo
*sra
,
3995 unsigned long long offset
, /* per device */
3996 unsigned long stripes
, /* per device, in old chunks */
3997 int *sources
, unsigned long long *offsets
,
3998 int disks
, int chunk
, int level
, int layout
,
3999 int dests
, int *destfd
, unsigned long long *destoffsets
,
4000 int part
, int *degraded
,
4003 /* Backup 'blocks' sectors at 'offset' on each device of the array,
4004 * to storage 'destfd' (offset 'destoffsets'), after first
4005 * suspending IO. Then allow resync to continue
4006 * over the suspended section.
4007 * Use part 'part' of the backup-super-block.
4012 unsigned long long ll
;
4014 //printf("offset %llu\n", offset);
4020 /* Check that array hasn't become degraded, else we might backup the wrong data */
4021 if (sysfs_get_ll(sra
, NULL
, "degraded", &ll
) < 0)
4022 return -1; /* FIXME this error is ignored */
4023 new_degraded
= (int)ll
;
4024 if (new_degraded
!= *degraded
) {
4025 /* check each device to ensure it is still working */
4027 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
4028 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
4030 if (sd
->disk
.state
& (1<<MD_DISK_SYNC
)) {
4032 if (sysfs_get_str(sra
, sd
, "state", sbuf
, 20) < 0 ||
4033 strstr(sbuf
, "faulty") ||
4034 strstr(sbuf
, "in_sync") == NULL
) {
4035 /* this device is dead */
4036 sd
->disk
.state
= (1<<MD_DISK_FAULTY
);
4037 if (sd
->disk
.raid_disk
>= 0 &&
4038 sources
[sd
->disk
.raid_disk
] >= 0) {
4039 close(sources
[sd
->disk
.raid_disk
]);
4040 sources
[sd
->disk
.raid_disk
] = -1;
4045 *degraded
= new_degraded
;
4048 bsb
.arraystart2
= __cpu_to_le64(offset
* odata
);
4049 bsb
.length2
= __cpu_to_le64(stripes
* (chunk
/512) * odata
);
4051 bsb
.arraystart
= __cpu_to_le64(offset
* odata
);
4052 bsb
.length
= __cpu_to_le64(stripes
* (chunk
/512) * odata
);
4055 bsb
.magic
[15] = '2';
4056 for (i
= 0; i
< dests
; i
++)
4058 lseek64(destfd
[i
], destoffsets
[i
] + __le64_to_cpu(bsb
.devstart2
)*512, 0);
4060 lseek64(destfd
[i
], destoffsets
[i
], 0);
4062 rv
= save_stripes(sources
, offsets
,
4063 disks
, chunk
, level
, layout
,
4065 offset
*512*odata
, stripes
* chunk
* odata
,
4070 bsb
.mtime
= __cpu_to_le64(time(0));
4071 for (i
= 0; i
< dests
; i
++) {
4072 bsb
.devstart
= __cpu_to_le64(destoffsets
[i
]/512);
4074 bsb
.sb_csum
= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
));
4075 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0)
4076 bsb
.sb_csum2
= bsb_csum((char*)&bsb
,
4077 ((char*)&bsb
.sb_csum2
)-((char*)&bsb
));
4080 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
] - 4096, 0)
4081 != destoffsets
[i
] - 4096)
4083 if (write(destfd
[i
], &bsb
, 512) != 512)
4085 if (destoffsets
[i
] > 4096) {
4086 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
]+stripes
*chunk
*odata
, 0) !=
4087 destoffsets
[i
]+stripes
*chunk
*odata
)
4089 if (write(destfd
[i
], &bsb
, 512) != 512)
4099 /* in 2.6.30, the value reported by sync_completed can be
4100 * less that it should be by one stripe.
4101 * This only happens when reshape hits sync_max and pauses.
4102 * So allow wait_backup to either extent sync_max further
4103 * than strictly necessary, or return before the
4104 * sync has got quite as far as we would really like.
4105 * This is what 'blocks2' is for.
4106 * The various caller give appropriate values so that
4109 /* FIXME return value is often ignored */
4110 static int forget_backup(int dests
, int *destfd
,
4111 unsigned long long *destoffsets
,
4115 * Erase backup 'part' (which is 0 or 1)
4121 bsb
.arraystart2
= __cpu_to_le64(0);
4122 bsb
.length2
= __cpu_to_le64(0);
4124 bsb
.arraystart
= __cpu_to_le64(0);
4125 bsb
.length
= __cpu_to_le64(0);
4127 bsb
.mtime
= __cpu_to_le64(time(0));
4129 for (i
= 0; i
< dests
; i
++) {
4130 bsb
.devstart
= __cpu_to_le64(destoffsets
[i
]/512);
4131 bsb
.sb_csum
= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
));
4132 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0)
4133 bsb
.sb_csum2
= bsb_csum((char*)&bsb
,
4134 ((char*)&bsb
.sb_csum2
)-((char*)&bsb
));
4135 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
]-4096, 0) !=
4136 destoffsets
[i
]-4096)
4139 write(destfd
[i
], &bsb
, 512) != 512)
4146 static void fail(char *msg
)
4149 rv
= (write(2, msg
, strlen(msg
)) != (int)strlen(msg
));
4150 rv
|= (write(2, "\n", 1) != 1);
4154 static char *abuf
, *bbuf
;
4155 static unsigned long long abuflen
;
4156 static void validate(int afd
, int bfd
, unsigned long long offset
)
4158 /* check that the data in the backup against the array.
4159 * This is only used for regression testing and should not
4160 * be used while the array is active
4164 lseek64(bfd
, offset
- 4096, 0);
4165 if (read(bfd
, &bsb2
, 512) != 512)
4166 fail("cannot read bsb");
4167 if (bsb2
.sb_csum
!= bsb_csum((char*)&bsb2
,
4168 ((char*)&bsb2
.sb_csum
)-((char*)&bsb2
)))
4169 fail("first csum bad");
4170 if (memcmp(bsb2
.magic
, "md_backup_data", 14) != 0)
4171 fail("magic is bad");
4172 if (memcmp(bsb2
.magic
, "md_backup_data-2", 16) == 0 &&
4173 bsb2
.sb_csum2
!= bsb_csum((char*)&bsb2
,
4174 ((char*)&bsb2
.sb_csum2
)-((char*)&bsb2
)))
4175 fail("second csum bad");
4177 if (__le64_to_cpu(bsb2
.devstart
)*512 != offset
)
4178 fail("devstart is wrong");
4181 unsigned long long len
= __le64_to_cpu(bsb2
.length
)*512;
4183 if (abuflen
< len
) {
4187 if (posix_memalign((void**)&abuf
, 4096, abuflen
) ||
4188 posix_memalign((void**)&bbuf
, 4096, abuflen
)) {
4190 /* just stop validating on mem-alloc failure */
4195 lseek64(bfd
, offset
, 0);
4196 if ((unsigned long long)read(bfd
, bbuf
, len
) != len
) {
4197 //printf("len %llu\n", len);
4198 fail("read first backup failed");
4200 lseek64(afd
, __le64_to_cpu(bsb2
.arraystart
)*512, 0);
4201 if ((unsigned long long)read(afd
, abuf
, len
) != len
)
4202 fail("read first from array failed");
4203 if (memcmp(bbuf
, abuf
, len
) != 0) {
4206 printf("offset=%llu len=%llu\n",
4207 (unsigned long long)__le64_to_cpu(bsb2
.arraystart
)*512, len
);
4208 for (i
=0; i
<len
; i
++)
4209 if (bbuf
[i
] != abuf
[i
]) {
4210 printf("first diff byte %d\n", i
);
4214 fail("data1 compare failed");
4218 unsigned long long len
= __le64_to_cpu(bsb2
.length2
)*512;
4220 if (abuflen
< len
) {
4224 abuf
= xmalloc(abuflen
);
4225 bbuf
= xmalloc(abuflen
);
4228 lseek64(bfd
, offset
+__le64_to_cpu(bsb2
.devstart2
)*512, 0);
4229 if ((unsigned long long)read(bfd
, bbuf
, len
) != len
)
4230 fail("read second backup failed");
4231 lseek64(afd
, __le64_to_cpu(bsb2
.arraystart2
)*512, 0);
4232 if ((unsigned long long)read(afd
, abuf
, len
) != len
)
4233 fail("read second from array failed");
4234 if (memcmp(bbuf
, abuf
, len
) != 0)
4235 fail("data2 compare failed");
4239 int child_monitor(int afd
, struct mdinfo
*sra
, struct reshape
*reshape
,
4240 struct supertype
*st
, unsigned long blocks
,
4241 int *fds
, unsigned long long *offsets
,
4242 int dests
, int *destfd
, unsigned long long *destoffsets
)
4244 /* Monitor a reshape where backup is being performed using
4245 * 'native' mechanism - either to a backup file, or
4246 * to some space in a spare.
4250 unsigned long long speed
;
4251 unsigned long long suspend_point
, array_size
;
4252 unsigned long long backup_point
, wait_point
;
4253 unsigned long long reshape_completed
;
4255 int increasing
= reshape
->after
.data_disks
>= reshape
->before
.data_disks
;
4256 int part
= 0; /* The next part of the backup area to fill. It may already
4257 * be full, so we need to check */
4258 int level
= reshape
->level
;
4259 int layout
= reshape
->before
.layout
;
4260 int data
= reshape
->before
.data_disks
;
4261 int disks
= reshape
->before
.data_disks
+ reshape
->parity
;
4262 int chunk
= sra
->array
.chunk_size
;
4264 unsigned long stripes
;
4268 /* set up the backup-super-block. This requires the
4269 * uuid from the array.
4271 /* Find a superblock */
4272 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
4276 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
4278 dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 1);
4279 devfd
= dev_open(dn
, O_RDONLY
);
4282 ok
= st
->ss
->load_super(st
, devfd
, NULL
);
4288 pr_err("Cannot find a superblock\n");
4292 memset(&bsb
, 0, 512);
4293 memcpy(bsb
.magic
, "md_backup_data-1", 16);
4294 st
->ss
->uuid_from_super(st
, uuid
);
4295 memcpy(bsb
.set_uuid
, uuid
, 16);
4296 bsb
.mtime
= __cpu_to_le64(time(0));
4297 bsb
.devstart2
= blocks
;
4299 stripes
= blocks
/ (sra
->array
.chunk_size
/512) /
4300 reshape
->before
.data_disks
;
4302 if (posix_memalign((void**)&buf
, 4096, disks
* chunk
))
4303 /* Don't start the 'reshape' */
4305 if (reshape
->before
.data_disks
== reshape
->after
.data_disks
) {
4306 sysfs_get_ll(sra
, NULL
, "sync_speed_min", &speed
);
4307 sysfs_set_num(sra
, NULL
, "sync_speed_min", 200000);
4311 array_size
= sra
->component_size
* reshape
->after
.data_disks
;
4312 backup_point
= sra
->reshape_progress
;
4315 array_size
= sra
->component_size
* reshape
->before
.data_disks
;
4316 backup_point
= reshape
->backup_blocks
;
4317 suspend_point
= array_size
;
4323 /* Want to return as soon the oldest backup slot can
4324 * be released as that allows us to start backing up
4325 * some more, providing suspend_point has been
4326 * advanced, which it should have.
4329 wait_point
= array_size
;
4330 if (part
== 0 && __le64_to_cpu(bsb
.length
) > 0)
4331 wait_point
= (__le64_to_cpu(bsb
.arraystart
) +
4332 __le64_to_cpu(bsb
.length
));
4333 if (part
== 1 && __le64_to_cpu(bsb
.length2
) > 0)
4334 wait_point
= (__le64_to_cpu(bsb
.arraystart2
) +
4335 __le64_to_cpu(bsb
.length2
));
4338 if (part
== 0 && __le64_to_cpu(bsb
.length
) > 0)
4339 wait_point
= __le64_to_cpu(bsb
.arraystart
);
4340 if (part
== 1 && __le64_to_cpu(bsb
.length2
) > 0)
4341 wait_point
= __le64_to_cpu(bsb
.arraystart2
);
4344 reshape_completed
= sra
->reshape_progress
;
4345 rv
= progress_reshape(sra
, reshape
,
4346 backup_point
, wait_point
,
4347 &suspend_point
, &reshape_completed
,
4349 /* external metadata would need to ping_monitor here */
4350 sra
->reshape_progress
= reshape_completed
;
4352 /* Clear any backup region that is before 'here' */
4354 if (__le64_to_cpu(bsb
.length
) > 0 &&
4355 reshape_completed
>= (__le64_to_cpu(bsb
.arraystart
) +
4356 __le64_to_cpu(bsb
.length
)))
4357 forget_backup(dests
, destfd
,
4359 if (__le64_to_cpu(bsb
.length2
) > 0 &&
4360 reshape_completed
>= (__le64_to_cpu(bsb
.arraystart2
) +
4361 __le64_to_cpu(bsb
.length2
)))
4362 forget_backup(dests
, destfd
,
4365 if (__le64_to_cpu(bsb
.length
) > 0 &&
4366 reshape_completed
<= (__le64_to_cpu(bsb
.arraystart
)))
4367 forget_backup(dests
, destfd
,
4369 if (__le64_to_cpu(bsb
.length2
) > 0 &&
4370 reshape_completed
<= (__le64_to_cpu(bsb
.arraystart2
)))
4371 forget_backup(dests
, destfd
,
4381 if (rv
== 0 && increasing
&& !st
->ss
->external
) {
4382 /* No longer need to monitor this reshape */
4383 sysfs_set_str(sra
, NULL
, "sync_max", "max");
4389 unsigned long long offset
;
4390 unsigned long actual_stripes
;
4391 /* Need to backup some data.
4392 * If 'part' is not used and the desired
4393 * backup size is suspended, do a backup,
4394 * then consider the next part.
4396 /* Check that 'part' is unused */
4397 if (part
== 0 && __le64_to_cpu(bsb
.length
) != 0)
4399 if (part
== 1 && __le64_to_cpu(bsb
.length2
) != 0)
4402 offset
= backup_point
/ data
;
4403 actual_stripes
= stripes
;
4405 if (offset
+ actual_stripes
* (chunk
/512) >
4406 sra
->component_size
)
4407 actual_stripes
= ((sra
->component_size
- offset
)
4409 if (offset
+ actual_stripes
* (chunk
/512) >
4413 if (offset
< actual_stripes
* (chunk
/512))
4414 actual_stripes
= offset
/ (chunk
/512);
4415 offset
-= actual_stripes
* (chunk
/512);
4416 if (offset
< suspend_point
/data
)
4419 if (actual_stripes
== 0)
4421 grow_backup(sra
, offset
, actual_stripes
,
4423 disks
, chunk
, level
, layout
,
4424 dests
, destfd
, destoffsets
,
4425 part
, °raded
, buf
);
4426 validate(afd
, destfd
[0], destoffsets
[0]);
4427 /* record where 'part' is up to */
4430 backup_point
+= actual_stripes
* (chunk
/512) * data
;
4432 backup_point
-= actual_stripes
* (chunk
/512) * data
;
4436 /* FIXME maybe call progress_reshape one more time instead */
4437 /* remove any remaining suspension */
4438 sysfs_set_num(sra
, NULL
, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL
);
4439 sysfs_set_num(sra
, NULL
, "suspend_hi", 0);
4440 sysfs_set_num(sra
, NULL
, "suspend_lo", 0);
4441 sysfs_set_num(sra
, NULL
, "sync_min", 0);
4443 if (reshape
->before
.data_disks
== reshape
->after
.data_disks
)
4444 sysfs_set_num(sra
, NULL
, "sync_speed_min", speed
);
4450 * If any spare contains md_back_data-1 which is recent wrt mtime,
4451 * write that data into the array and update the super blocks with
4452 * the new reshape_progress
4454 int Grow_restart(struct supertype
*st
, struct mdinfo
*info
, int *fdlist
, int cnt
,
4455 char *backup_file
, int verbose
)
4459 unsigned long long *offsets
;
4460 unsigned long long nstripe
, ostripe
;
4463 odata
= info
->array
.raid_disks
- info
->delta_disks
- 1;
4464 if (info
->array
.level
== 6) odata
--; /* number of data disks */
4465 ndata
= info
->array
.raid_disks
- 1;
4466 if (info
->new_level
== 6) ndata
--;
4468 old_disks
= info
->array
.raid_disks
- info
->delta_disks
;
4470 if (info
->delta_disks
<= 0)
4471 /* Didn't grow, so the backup file must have
4475 for (i
=old_disks
-(backup_file
?1:0); i
<cnt
; i
++) {
4476 struct mdinfo dinfo
;
4479 char *devname
, namebuf
[20];
4480 unsigned long long lo
, hi
;
4482 /* This was a spare and may have some saved data on it.
4483 * Load the superblock, find and load the
4484 * backup_super_block.
4485 * If either fail, go on to next device.
4486 * If the backup contains no new info, just return
4487 * else restore data and update all superblocks
4489 if (i
== old_disks
-1) {
4490 fd
= open(backup_file
, O_RDONLY
);
4492 pr_err("backup file %s inaccessible: %s\n",
4493 backup_file
, strerror(errno
));
4496 devname
= backup_file
;
4501 if (st
->ss
->load_super(st
, fd
, NULL
))
4504 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
4505 st
->ss
->free_super(st
);
4508 (dinfo
.data_offset
+ dinfo
.component_size
- 8) <<9,
4510 pr_err("Cannot seek on device %d\n", i
);
4511 continue; /* Cannot seek */
4513 sprintf(namebuf
, "device-%d", i
);
4516 if (read(fd
, &bsb
, sizeof(bsb
)) != sizeof(bsb
)) {
4518 pr_err("Cannot read from %s\n", devname
);
4519 continue; /* Cannot read */
4521 if (memcmp(bsb
.magic
, "md_backup_data-1", 16) != 0 &&
4522 memcmp(bsb
.magic
, "md_backup_data-2", 16) != 0) {
4524 pr_err("No backup metadata on %s\n", devname
);
4527 if (bsb
.sb_csum
!= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
))) {
4529 pr_err("Bad backup-metadata checksum on %s\n", devname
);
4530 continue; /* bad checksum */
4532 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0 &&
4533 bsb
.sb_csum2
!= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum2
)-((char*)&bsb
))) {
4535 pr_err("Bad backup-metadata checksum2 on %s\n", devname
);
4536 continue; /* Bad second checksum */
4538 if (memcmp(bsb
.set_uuid
,info
->uuid
, 16) != 0) {
4540 pr_err("Wrong uuid on backup-metadata on %s\n", devname
);
4541 continue; /* Wrong uuid */
4544 /* array utime and backup-mtime should be updated at much the same time, but it seems that
4545 * sometimes they aren't... So allow considerable flexability in matching, and allow
4546 * this test to be overridden by an environment variable.
4548 if(time_after(info
->array
.utime
, (unsigned int)__le64_to_cpu(bsb
.mtime
) + 2*60*60) ||
4549 time_before(info
->array
.utime
, (unsigned int)__le64_to_cpu(bsb
.mtime
) - 10*60)) {
4550 if (check_env("MDADM_GROW_ALLOW_OLD")) {
4551 pr_err("accepting backup with timestamp %lu for array with timestamp %lu\n",
4552 (unsigned long)__le64_to_cpu(bsb
.mtime
),
4553 (unsigned long)info
->array
.utime
);
4555 pr_err("too-old timestamp on backup-metadata on %s\n", devname
);
4556 pr_err("If you think it is should be safe, try 'export MDADM_GROW_ALLOW_OLD=1'\n");
4557 continue; /* time stamp is too bad */
4561 if (bsb
.magic
[15] == '1') {
4562 if (bsb
.length
== 0)
4564 if (info
->delta_disks
>= 0) {
4565 /* reshape_progress is increasing */
4566 if (__le64_to_cpu(bsb
.arraystart
)
4567 + __le64_to_cpu(bsb
.length
)
4568 < info
->reshape_progress
) {
4571 pr_err("backup-metadata found on %s but is not needed\n", devname
);
4572 continue; /* No new data here */
4575 /* reshape_progress is decreasing */
4576 if (__le64_to_cpu(bsb
.arraystart
) >=
4577 info
->reshape_progress
)
4578 goto nonew
; /* No new data here */
4581 if (bsb
.length
== 0 && bsb
.length2
== 0)
4583 if (info
->delta_disks
>= 0) {
4584 /* reshape_progress is increasing */
4585 if ((__le64_to_cpu(bsb
.arraystart
)
4586 + __le64_to_cpu(bsb
.length
)
4587 < info
->reshape_progress
)
4589 (__le64_to_cpu(bsb
.arraystart2
)
4590 + __le64_to_cpu(bsb
.length2
)
4591 < info
->reshape_progress
))
4592 goto nonew
; /* No new data here */
4594 /* reshape_progress is decreasing */
4595 if (__le64_to_cpu(bsb
.arraystart
) >=
4596 info
->reshape_progress
&&
4597 __le64_to_cpu(bsb
.arraystart2
) >=
4598 info
->reshape_progress
)
4599 goto nonew
; /* No new data here */
4602 if (lseek64(fd
, __le64_to_cpu(bsb
.devstart
)*512, 0)< 0) {
4605 pr_err("Failed to verify secondary backup-metadata block on %s\n",
4607 continue; /* Cannot seek */
4609 /* There should be a duplicate backup superblock 4k before here */
4610 if (lseek64(fd
, -4096, 1) < 0 ||
4611 read(fd
, &bsb2
, sizeof(bsb2
)) != sizeof(bsb2
))
4612 goto second_fail
; /* Cannot find leading superblock */
4613 if (bsb
.magic
[15] == '1')
4614 bsbsize
= offsetof(struct mdp_backup_super
, pad1
);
4616 bsbsize
= offsetof(struct mdp_backup_super
, pad
);
4617 if (memcmp(&bsb2
, &bsb
, bsbsize
) != 0)
4618 goto second_fail
; /* Cannot find leading superblock */
4620 /* Now need the data offsets for all devices. */
4621 offsets
= xmalloc(sizeof(*offsets
)*info
->array
.raid_disks
);
4622 for(j
=0; j
<info
->array
.raid_disks
; j
++) {
4625 if (st
->ss
->load_super(st
, fdlist
[j
], NULL
))
4626 /* FIXME should be this be an error */
4628 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
4629 st
->ss
->free_super(st
);
4630 offsets
[j
] = dinfo
.data_offset
* 512;
4632 printf("%s: restoring critical section\n", Name
);
4634 if (restore_stripes(fdlist
, offsets
,
4635 info
->array
.raid_disks
,
4639 fd
, __le64_to_cpu(bsb
.devstart
)*512,
4640 __le64_to_cpu(bsb
.arraystart
)*512,
4641 __le64_to_cpu(bsb
.length
)*512, NULL
)) {
4642 /* didn't succeed, so giveup */
4644 pr_err("Error restoring backup from %s\n",
4650 if (bsb
.magic
[15] == '2' &&
4651 restore_stripes(fdlist
, offsets
,
4652 info
->array
.raid_disks
,
4656 fd
, __le64_to_cpu(bsb
.devstart
)*512 +
4657 __le64_to_cpu(bsb
.devstart2
)*512,
4658 __le64_to_cpu(bsb
.arraystart2
)*512,
4659 __le64_to_cpu(bsb
.length2
)*512, NULL
)) {
4660 /* didn't succeed, so giveup */
4662 pr_err("Error restoring second backup from %s\n",
4670 /* Ok, so the data is restored. Let's update those superblocks. */
4674 lo
= __le64_to_cpu(bsb
.arraystart
);
4675 hi
= lo
+ __le64_to_cpu(bsb
.length
);
4677 if (bsb
.magic
[15] == '2' && bsb
.length2
) {
4678 unsigned long long lo1
, hi1
;
4679 lo1
= __le64_to_cpu(bsb
.arraystart2
);
4680 hi1
= lo1
+ __le64_to_cpu(bsb
.length2
);
4684 } else if (lo
< lo1
)
4690 (info
->reshape_progress
< lo
||
4691 info
->reshape_progress
> hi
))
4692 /* backup does not affect reshape_progress*/ ;
4693 else if (info
->delta_disks
>= 0) {
4694 info
->reshape_progress
= __le64_to_cpu(bsb
.arraystart
) +
4695 __le64_to_cpu(bsb
.length
);
4696 if (bsb
.magic
[15] == '2') {
4697 unsigned long long p2
= __le64_to_cpu(bsb
.arraystart2
) +
4698 __le64_to_cpu(bsb
.length2
);
4699 if (p2
> info
->reshape_progress
)
4700 info
->reshape_progress
= p2
;
4703 info
->reshape_progress
= __le64_to_cpu(bsb
.arraystart
);
4704 if (bsb
.magic
[15] == '2') {
4705 unsigned long long p2
= __le64_to_cpu(bsb
.arraystart2
);
4706 if (p2
< info
->reshape_progress
)
4707 info
->reshape_progress
= p2
;
4710 for (j
=0; j
<info
->array
.raid_disks
; j
++) {
4713 if (st
->ss
->load_super(st
, fdlist
[j
], NULL
))
4715 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
4716 dinfo
.reshape_progress
= info
->reshape_progress
;
4717 st
->ss
->update_super(st
, &dinfo
,
4718 "_reshape_progress",
4720 st
->ss
->store_super(st
, fdlist
[j
]);
4721 st
->ss
->free_super(st
);
4725 /* Didn't find any backup data, try to see if any
4728 if (info
->delta_disks
< 0) {
4729 /* When shrinking, the critical section is at the end.
4730 * So see if we are before the critical section.
4732 unsigned long long first_block
;
4733 nstripe
= ostripe
= 0;
4735 while (ostripe
>= nstripe
) {
4736 ostripe
+= info
->array
.chunk_size
/ 512;
4737 first_block
= ostripe
* odata
;
4738 nstripe
= first_block
/ ndata
/ (info
->new_chunk
/512) *
4739 (info
->new_chunk
/512);
4742 if (info
->reshape_progress
>= first_block
)
4745 if (info
->delta_disks
> 0) {
4746 /* See if we are beyond the critical section. */
4747 unsigned long long last_block
;
4748 nstripe
= ostripe
= 0;
4750 while (nstripe
>= ostripe
) {
4751 nstripe
+= info
->new_chunk
/ 512;
4752 last_block
= nstripe
* ndata
;
4753 ostripe
= last_block
/ odata
/ (info
->array
.chunk_size
/512) *
4754 (info
->array
.chunk_size
/512);
4757 if (info
->reshape_progress
>= last_block
)
4760 /* needed to recover critical section! */
4762 pr_err("Failed to find backup of critical section\n");
4766 int Grow_continue_command(char *devname
, int fd
,
4767 char *backup_file
, int verbose
)
4770 struct supertype
*st
= NULL
;
4771 struct mdinfo
*content
= NULL
;
4772 struct mdinfo array
;
4773 char *subarray
= NULL
;
4774 struct mdinfo
*cc
= NULL
;
4775 struct mdstat_ent
*mdstat
= NULL
;
4779 dprintf("Grow continue from command line called for %s\n",
4782 st
= super_by_fd(fd
, &subarray
);
4783 if (!st
|| !st
->ss
) {
4784 pr_err("Unable to determine metadata format for %s\n",
4788 dprintf("Grow continue is run for ");
4789 if (st
->ss
->external
== 0) {
4792 dprintf_cont("native array (%s)\n", devname
);
4793 if (ioctl(fd
, GET_ARRAY_INFO
, &array
.array
) < 0) {
4794 pr_err("%s is not an active md array - aborting\n", devname
);
4796 goto Grow_continue_command_exit
;
4799 /* Need to load a superblock.
4800 * FIXME we should really get what we need from
4804 for (d
= 0; d
< MAX_DISKS
; d
++) {
4805 mdu_disk_info_t disk
;
4809 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
4811 if (disk
.major
== 0 && disk
.minor
== 0)
4813 if ((disk
.state
& (1 << MD_DISK_ACTIVE
)) == 0)
4815 dv
= map_dev(disk
.major
, disk
.minor
, 1);
4818 fd2
= dev_open(dv
, O_RDONLY
);
4821 err
= st
->ss
->load_super(st
, fd2
, NULL
);
4827 if (d
== MAX_DISKS
) {
4828 pr_err("Unable to load metadata for %s\n",
4831 goto Grow_continue_command_exit
;
4833 st
->ss
->getinfo_super(st
, content
, NULL
);
4834 if (!content
->reshape_active
)
4838 } while (cnt
-- > 0);
4843 dprintf_cont("subarray (%s)\n", subarray
);
4844 container
= st
->container_devnm
;
4845 cfd
= open_dev_excl(st
->container_devnm
);
4847 container
= st
->devnm
;
4849 cfd
= open_dev_excl(st
->devnm
);
4850 dprintf_cont("container (%s)\n", container
);
4854 pr_err("Unable to open container for %s\n", devname
);
4856 goto Grow_continue_command_exit
;
4859 /* find in container array under reshape
4861 ret_val
= st
->ss
->load_container(st
, cfd
, NULL
);
4863 pr_err("Cannot read superblock for %s\n",
4866 goto Grow_continue_command_exit
;
4869 cc
= st
->ss
->container_content(st
, subarray
);
4870 for (content
= cc
; content
; content
= content
->next
) {
4872 int allow_reshape
= 1;
4874 if (content
->reshape_active
== 0)
4876 /* The decision about array or container wide
4877 * reshape is taken in Grow_continue based
4878 * content->reshape_active state, therefore we
4879 * need to check_reshape based on
4880 * reshape_active and subarray name
4882 if (content
->array
.state
& (1<<MD_SB_BLOCK_VOLUME
))
4884 if (content
->reshape_active
== CONTAINER_RESHAPE
&&
4885 (content
->array
.state
4886 & (1<<MD_SB_BLOCK_CONTAINER_RESHAPE
)))
4889 if (!allow_reshape
) {
4890 pr_err("cannot continue reshape of an array in container with unsupported metadata: %s(%s)\n",
4891 devname
, container
);
4893 goto Grow_continue_command_exit
;
4896 array
= strchr(content
->text_version
+1, '/')+1;
4897 mdstat
= mdstat_by_subdev(array
, container
);
4900 if (mdstat
->active
== 0) {
4901 pr_err("Skipping inactive array %s.\n",
4903 free_mdstat(mdstat
);
4910 pr_err("Unable to determine reshaped array for %s\n", devname
);
4912 goto Grow_continue_command_exit
;
4914 fd2
= open_dev(mdstat
->devnm
);
4916 pr_err("cannot open (%s)\n", mdstat
->devnm
);
4918 goto Grow_continue_command_exit
;
4921 sysfs_init(content
, fd2
, mdstat
->devnm
);
4925 /* start mdmon in case it is not running
4927 if (!mdmon_running(container
))
4928 start_mdmon(container
);
4929 ping_monitor(container
);
4931 if (mdmon_running(container
))
4932 st
->update_tail
= &st
->updates
;
4934 pr_err("No mdmon found. Grow cannot continue.\n");
4936 goto Grow_continue_command_exit
;
4940 /* verify that array under reshape is started from
4943 if (verify_reshape_position(content
, content
->array
.level
) < 0) {
4945 goto Grow_continue_command_exit
;
4950 ret_val
= Grow_continue(fd
, st
, content
, backup_file
, 1, 0);
4952 Grow_continue_command_exit
:
4955 st
->ss
->free_super(st
);
4956 free_mdstat(mdstat
);
4963 int Grow_continue(int mdfd
, struct supertype
*st
, struct mdinfo
*info
,
4964 char *backup_file
, int forked
, int freeze_reshape
)
4968 if (!info
->reshape_active
)
4971 if (st
->ss
->external
) {
4972 int cfd
= open_dev(st
->container_devnm
);
4977 st
->ss
->load_container(st
, cfd
, st
->container_devnm
);
4979 ret_val
= reshape_container(st
->container_devnm
, NULL
, mdfd
,
4980 st
, info
, 0, backup_file
,
4982 1 | info
->reshape_active
,
4985 ret_val
= reshape_array(NULL
, mdfd
, "array", st
, info
, 1,
4986 NULL
, INVALID_SECTORS
,
4987 backup_file
, 0, forked
,
4988 1 | info
->reshape_active
,
4994 char *make_backup(char *name
)
4996 char *base
= "backup_file-";
5000 len
= strlen(MAP_DIR
) + 1 + strlen(base
) + strlen(name
)+1;
5001 fname
= xmalloc(len
);
5002 sprintf(fname
, "%s/%s%s", MAP_DIR
, base
, name
);
5006 char *locate_backup(char *name
)
5008 char *fl
= make_backup(name
);
5011 if (stat(fl
, &stb
) == 0 &&
5012 S_ISREG(stb
.st_mode
))