2 * mdadm - manage Linux "md" devices aka RAID arrays.
4 * Copyright (C) 2001-2012 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>
29 #if ! defined(__BIG_ENDIAN) && ! defined(__LITTLE_ENDIAN)
30 #error no endian defined
36 #define offsetof(t,f) ((size_t)&(((t*)0)->f))
39 int restore_backup(struct supertype
*st
,
40 struct mdinfo
*content
,
50 int disk_count
= next_spare
+ working_disks
;
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
;
72 if (st
->ss
->external
&& st
->ss
->recover_backup
)
73 err
= st
->ss
->recover_backup(st
, content
);
75 err
= Grow_restart(st
, content
, fdlist
, next_spare
,
76 backup_file
, verbose
> 0);
78 while (next_spare
> 0) {
80 if (fdlist
[next_spare
] >= 0)
81 close(fdlist
[next_spare
]);
85 pr_err("Failed to restore critical"
86 " section for reshape - sorry.\n");
88 pr_err("Possibly you need"
89 " to specify a --backup-file\n");
93 dprintf("restore_backup() returns status OK.\n");
97 int Grow_Add_device(char *devname
, int fd
, char *newdev
)
99 /* Add a device to an active array.
100 * Currently, just extend a linear array.
101 * This requires writing a new superblock on the
102 * new device, calling the kernel to add the device,
103 * and if that succeeds, update the superblock on
105 * This means that we need to *find* all other devices.
112 struct supertype
*st
= NULL
;
113 char *subarray
= NULL
;
115 if (ioctl(fd
, GET_ARRAY_INFO
, &info
.array
) < 0) {
116 pr_err("cannot get array info for %s\n", devname
);
120 if (info
.array
.level
!= -1) {
121 pr_err("can only add devices to linear arrays\n");
125 st
= super_by_fd(fd
, &subarray
);
127 pr_err("cannot handle arrays with superblock version %d\n",
128 info
.array
.major_version
);
133 pr_err("Cannot grow linear sub-arrays yet\n");
139 nfd
= open(newdev
, O_RDWR
|O_EXCL
|O_DIRECT
);
141 pr_err("cannot open %s\n", newdev
);
146 if ((stb
.st_mode
& S_IFMT
) != S_IFBLK
) {
147 pr_err("%s is not a block device!\n", newdev
);
152 /* now check out all the devices and make sure we can read the
154 for (d
=0 ; d
< info
.array
.raid_disks
; d
++) {
155 mdu_disk_info_t disk
;
158 st
->ss
->free_super(st
);
161 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0) {
162 pr_err("cannot get device detail for device %d\n",
168 dv
= map_dev(disk
.major
, disk
.minor
, 1);
170 pr_err("cannot find device file for device %d\n",
176 fd2
= dev_open(dv
, O_RDWR
);
178 pr_err("cannot open device file %s\n", dv
);
184 if (st
->ss
->load_super(st
, fd2
, NULL
)) {
185 pr_err("cannot find super block on %s\n", dv
);
193 /* Ok, looks good. Lets update the superblock and write it out to
197 info
.disk
.number
= d
;
198 info
.disk
.major
= major(stb
.st_rdev
);
199 info
.disk
.minor
= minor(stb
.st_rdev
);
200 info
.disk
.raid_disk
= d
;
201 info
.disk
.state
= (1 << MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
);
202 st
->ss
->update_super(st
, &info
, "linear-grow-new", newdev
,
205 if (st
->ss
->store_super(st
, nfd
)) {
206 pr_err("Cannot store new superblock on %s\n",
213 if (ioctl(fd
, ADD_NEW_DISK
, &info
.disk
) != 0) {
214 pr_err("Cannot add new disk to this array\n");
217 /* Well, that seems to have worked.
218 * Now go through and update all superblocks
221 if (ioctl(fd
, GET_ARRAY_INFO
, &info
.array
) < 0) {
222 pr_err("cannot get array info for %s\n", devname
);
227 for (d
=0 ; d
< info
.array
.raid_disks
; d
++) {
228 mdu_disk_info_t disk
;
232 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0) {
233 pr_err("cannot get device detail for device %d\n",
237 dv
= map_dev(disk
.major
, disk
.minor
, 1);
239 pr_err("cannot find device file for device %d\n",
243 fd2
= dev_open(dv
, O_RDWR
);
245 pr_err("cannot open device file %s\n", dv
);
248 if (st
->ss
->load_super(st
, fd2
, NULL
)) {
249 pr_err("cannot find super block on %s\n", dv
);
253 info
.array
.raid_disks
= nd
+1;
254 info
.array
.nr_disks
= nd
+1;
255 info
.array
.active_disks
= nd
+1;
256 info
.array
.working_disks
= nd
+1;
258 st
->ss
->update_super(st
, &info
, "linear-grow-update", dv
,
261 if (st
->ss
->store_super(st
, fd2
)) {
262 pr_err("Cannot store new superblock on %s\n", dv
);
272 int Grow_addbitmap(char *devname
, int fd
, struct context
*c
, struct shape
*s
)
275 * First check that array doesn't have a bitmap
276 * Then create the bitmap
279 * For internal bitmaps, we need to check the version,
280 * find all the active devices, and write the bitmap block
283 mdu_bitmap_file_t bmf
;
284 mdu_array_info_t array
;
285 struct supertype
*st
;
286 char *subarray
= NULL
;
287 int major
= BITMAP_MAJOR_HI
;
288 int vers
= md_get_version(fd
);
289 unsigned long long bitmapsize
, array_size
;
292 major
= BITMAP_MAJOR_HOSTENDIAN
;
293 pr_err("Warning - bitmaps created on this kernel"
294 " are not portable\n"
295 " between different architectures. Consider upgrading"
296 " the Linux kernel.\n");
299 if (ioctl(fd
, GET_BITMAP_FILE
, &bmf
) != 0) {
301 pr_err("Memory allocation failure.\n");
303 pr_err("bitmaps not supported by this kernel.\n");
306 if (bmf
.pathname
[0]) {
307 if (strcmp(s
->bitmap_file
,"none")==0) {
308 if (ioctl(fd
, SET_BITMAP_FILE
, -1)!= 0) {
309 pr_err("failed to remove bitmap %s\n",
315 pr_err("%s already has a bitmap (%s)\n",
316 devname
, bmf
.pathname
);
319 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) != 0) {
320 pr_err("cannot get array status for %s\n", devname
);
323 if (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)) {
324 if (strcmp(s
->bitmap_file
, "none")==0) {
325 array
.state
&= ~(1<<MD_SB_BITMAP_PRESENT
);
326 if (ioctl(fd
, SET_ARRAY_INFO
, &array
)!= 0) {
327 pr_err("failed to remove internal bitmap.\n");
332 pr_err("Internal bitmap already present on %s\n",
337 if (strcmp(s
->bitmap_file
, "none") == 0) {
338 pr_err("no bitmap found on %s\n", devname
);
341 if (array
.level
<= 0) {
342 pr_err("Bitmaps not meaningful with level %s\n",
343 map_num(pers
, array
.level
)?:"of this array");
346 bitmapsize
= array
.size
;
348 if (get_dev_size(fd
, NULL
, &array_size
) &&
349 array_size
> (0x7fffffffULL
<<9)) {
350 /* Array is big enough that we cannot trust array.size
351 * try other approaches
353 bitmapsize
= get_component_size(fd
);
355 if (bitmapsize
== 0) {
356 pr_err("Cannot reliably determine size of array to create bitmap - sorry.\n");
360 if (array
.level
== 10) {
361 int ncopies
= (array
.layout
&255)*((array
.layout
>>8)&255);
362 bitmapsize
= bitmapsize
* array
.raid_disks
/ ncopies
;
365 st
= super_by_fd(fd
, &subarray
);
367 pr_err("Cannot understand version %d.%d\n",
368 array
.major_version
, array
.minor_version
);
372 pr_err("Cannot add bitmaps to sub-arrays yet\n");
377 if (strcmp(s
->bitmap_file
, "internal") == 0) {
380 int offset_setable
= 0;
382 if (st
->ss
->add_internal_bitmap
== NULL
) {
383 pr_err("Internal bitmaps not supported "
384 "with %s metadata\n", st
->ss
->name
);
387 mdi
= sysfs_read(fd
, NULL
, GET_BITMAP_LOCATION
);
390 for (d
=0; d
< st
->max_devs
; d
++) {
391 mdu_disk_info_t disk
;
394 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
396 if (disk
.major
== 0 &&
399 if ((disk
.state
& (1<<MD_DISK_SYNC
))==0)
401 dv
= map_dev(disk
.major
, disk
.minor
, 1);
403 int fd2
= dev_open(dv
, O_RDWR
);
406 if (st
->ss
->load_super(st
, fd2
, NULL
)==0) {
407 if (st
->ss
->add_internal_bitmap(
409 &s
->bitmap_chunk
, c
->delay
, s
->write_behind
,
410 bitmapsize
, offset_setable
,
413 st
->ss
->write_bitmap(st
, fd2
);
415 pr_err("failed to create internal bitmap"
416 " - chunksize problem.\n");
424 if (offset_setable
) {
425 st
->ss
->getinfo_super(st
, mdi
, NULL
);
426 sysfs_init(mdi
, fd
, NULL
);
427 rv
= sysfs_set_num_signed(mdi
, NULL
, "bitmap/location",
430 array
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
431 rv
= ioctl(fd
, SET_ARRAY_INFO
, &array
);
435 pr_err("Cannot add bitmap while array is"
436 " resyncing or reshaping etc.\n");
437 pr_err("failed to set internal bitmap.\n");
444 int max_devs
= st
->max_devs
;
446 /* try to load a superblock */
447 for (d
= 0; d
< max_devs
; d
++) {
448 mdu_disk_info_t disk
;
452 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
454 if ((disk
.major
==0 && disk
.minor
==0) ||
455 (disk
.state
& (1<<MD_DISK_REMOVED
)))
457 dv
= map_dev(disk
.major
, disk
.minor
, 1);
460 fd2
= dev_open(dv
, O_RDONLY
);
462 if (st
->ss
->load_super(st
, fd2
, NULL
) == 0) {
464 st
->ss
->uuid_from_super(st
, uuid
);
471 pr_err("cannot find UUID for array!\n");
474 if (CreateBitmap(s
->bitmap_file
, c
->force
, (char*)uuid
, s
->bitmap_chunk
,
475 c
->delay
, s
->write_behind
, bitmapsize
, major
)) {
478 bitmap_fd
= open(s
->bitmap_file
, O_RDWR
);
480 pr_err("weird: %s cannot be opened\n",
484 if (ioctl(fd
, SET_BITMAP_FILE
, bitmap_fd
) < 0) {
487 pr_err("Cannot add bitmap while array is"
488 " resyncing or reshaping etc.\n");
489 pr_err("Cannot set bitmap file for %s: %s\n",
490 devname
, strerror(err
));
499 * When reshaping an array we might need to backup some data.
500 * This is written to all spares with a 'super_block' describing it.
501 * The superblock goes 4K from the end of the used space on the
503 * It if written after the backup is complete.
504 * It has the following structure.
507 static struct mdp_backup_super
{
508 char magic
[16]; /* md_backup_data-1 or -2 */
511 /* start/sizes in 512byte sectors */
512 __u64 devstart
; /* address on backup device/file of data */
515 __u32 sb_csum
; /* csum of preceeding bytes. */
517 __u64 devstart2
; /* offset in to data of second section */
520 __u32 sb_csum2
; /* csum of preceeding bytes. */
522 } __attribute__((aligned(512))) bsb
, bsb2
;
524 static __u32
bsb_csum(char *buf
, int len
)
528 for (i
= 0; i
< len
; i
++)
529 csum
= (csum
<<3) + buf
[0];
530 return __cpu_to_le32(csum
);
533 static int check_idle(struct supertype
*st
)
535 /* Check that all member arrays for this container, or the
536 * container of this array, are idle
538 char *container
= (st
->container_devnm
[0]
539 ? st
->container_devnm
: st
->devnm
);
540 struct mdstat_ent
*ent
, *e
;
543 ent
= mdstat_read(0, 0);
544 for (e
= ent
; e
; e
= e
->next
) {
545 if (!is_container_member(e
, container
))
547 if (e
->percent
>= 0) {
556 static int freeze_container(struct supertype
*st
)
558 char *container
= (st
->container_devnm
[0]
559 ? st
->container_devnm
: st
->devnm
);
564 if (block_monitor(container
, 1)) {
565 pr_err("failed to freeze container\n");
572 static void unfreeze_container(struct supertype
*st
)
574 char *container
= (st
->container_devnm
[0]
575 ? st
->container_devnm
: st
->devnm
);
577 unblock_monitor(container
, 1);
580 static int freeze(struct supertype
*st
)
582 /* Try to freeze resync/rebuild on this array/container.
583 * Return -1 if the array is busy,
584 * return -2 container cannot be frozen,
585 * return 0 if this kernel doesn't support 'frozen'
586 * return 1 if it worked.
588 if (st
->ss
->external
)
589 return freeze_container(st
);
591 struct mdinfo
*sra
= sysfs_read(-1, st
->devnm
, GET_VERSION
);
597 /* Need to clear any 'read-auto' status */
598 if (sysfs_get_str(sra
, NULL
, "array_state", buf
, 20) > 0 &&
599 strncmp(buf
, "read-auto", 9) == 0)
600 sysfs_set_str(sra
, NULL
, "array_state", "clean");
602 err
= sysfs_freeze_array(sra
);
608 static void unfreeze(struct supertype
*st
)
610 if (st
->ss
->external
)
611 return unfreeze_container(st
);
613 struct mdinfo
*sra
= sysfs_read(-1, st
->devnm
, GET_VERSION
);
616 sysfs_set_str(sra
, NULL
, "sync_action", "idle");
621 static void wait_reshape(struct mdinfo
*sra
)
623 int fd
= sysfs_get_fd(sra
, NULL
, "sync_action");
629 while (sysfs_fd_get_str(fd
, action
, 20) > 0 &&
630 strncmp(action
, "reshape", 7) == 0) {
634 select(fd
+1, NULL
, NULL
, &rfds
, NULL
);
639 static int reshape_super(struct supertype
*st
, unsigned long long size
,
640 int level
, int layout
, int chunksize
, int raid_disks
,
641 int delta_disks
, char *backup_file
, char *dev
,
642 int direction
, int verbose
)
644 /* nothing extra to check in the native case */
645 if (!st
->ss
->external
)
647 if (!st
->ss
->reshape_super
||
648 !st
->ss
->manage_reshape
) {
649 pr_err("%s metadata does not support reshape\n",
654 return st
->ss
->reshape_super(st
, size
, level
, layout
, chunksize
,
655 raid_disks
, delta_disks
, backup_file
, dev
,
659 static void sync_metadata(struct supertype
*st
)
661 if (st
->ss
->external
) {
662 if (st
->update_tail
) {
663 flush_metadata_updates(st
);
664 st
->update_tail
= &st
->updates
;
666 st
->ss
->sync_metadata(st
);
670 static int subarray_set_num(char *container
, struct mdinfo
*sra
, char *name
, int n
)
672 /* when dealing with external metadata subarrays we need to be
673 * prepared to handle EAGAIN. The kernel may need to wait for
674 * mdmon to mark the array active so the kernel can handle
675 * allocations/writeback when preparing the reshape action
676 * (md_allow_write()). We temporarily disable safe_mode_delay
677 * to close a race with the array_state going clean before the
678 * next write to raid_disks / stripe_cache_size
683 /* only 'raid_disks' and 'stripe_cache_size' trigger md_allow_write */
685 (strcmp(name
, "raid_disks") != 0 &&
686 strcmp(name
, "stripe_cache_size") != 0))
687 return sysfs_set_num(sra
, NULL
, name
, n
);
689 rc
= sysfs_get_str(sra
, NULL
, "safe_mode_delay", safe
, sizeof(safe
));
692 sysfs_set_num(sra
, NULL
, "safe_mode_delay", 0);
693 rc
= sysfs_set_num(sra
, NULL
, name
, n
);
694 if (rc
< 0 && errno
== EAGAIN
) {
695 ping_monitor(container
);
696 /* if we get EAGAIN here then the monitor is not active
699 rc
= sysfs_set_num(sra
, NULL
, name
, n
);
701 sysfs_set_str(sra
, NULL
, "safe_mode_delay", safe
);
705 int start_reshape(struct mdinfo
*sra
, int already_running
,
706 int before_data_disks
, int data_disks
)
709 unsigned long long sync_max_to_set
;
711 sysfs_set_num(sra
, NULL
, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL
);
712 err
= sysfs_set_num(sra
, NULL
, "suspend_hi", sra
->reshape_progress
);
713 err
= err
?: sysfs_set_num(sra
, NULL
, "suspend_lo",
714 sra
->reshape_progress
);
715 if (before_data_disks
<= data_disks
)
716 sync_max_to_set
= sra
->reshape_progress
/ data_disks
;
718 sync_max_to_set
= (sra
->component_size
* data_disks
719 - sra
->reshape_progress
) / data_disks
;
720 if (!already_running
)
721 sysfs_set_num(sra
, NULL
, "sync_min", sync_max_to_set
);
722 err
= err
?: sysfs_set_num(sra
, NULL
, "sync_max", sync_max_to_set
);
723 if (!already_running
)
724 err
= err
?: sysfs_set_str(sra
, NULL
, "sync_action", "reshape");
729 void abort_reshape(struct mdinfo
*sra
)
731 sysfs_set_str(sra
, NULL
, "sync_action", "idle");
732 sysfs_set_num(sra
, NULL
, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL
);
733 sysfs_set_num(sra
, NULL
, "suspend_hi", 0);
734 sysfs_set_num(sra
, NULL
, "suspend_lo", 0);
735 sysfs_set_num(sra
, NULL
, "sync_min", 0);
736 sysfs_set_str(sra
, NULL
, "sync_max", "max");
739 int remove_disks_for_takeover(struct supertype
*st
,
744 struct mdinfo
*remaining
;
747 if (sra
->array
.level
== 10)
748 nr_of_copies
= layout
& 0xff;
749 else if (sra
->array
.level
== 1)
750 nr_of_copies
= sra
->array
.raid_disks
;
754 remaining
= sra
->devs
;
756 /* for each 'copy', select one device and remove from the list. */
757 for (slot
= 0; slot
< sra
->array
.raid_disks
; slot
+= nr_of_copies
) {
758 struct mdinfo
**diskp
;
761 /* Find a working device to keep */
762 for (diskp
= &remaining
; *diskp
; diskp
= &(*diskp
)->next
) {
763 struct mdinfo
*disk
= *diskp
;
765 if (disk
->disk
.raid_disk
< slot
)
767 if (disk
->disk
.raid_disk
>= slot
+ nr_of_copies
)
769 if (disk
->disk
.state
& (1<<MD_DISK_REMOVED
))
771 if (disk
->disk
.state
& (1<<MD_DISK_FAULTY
))
773 if (!(disk
->disk
.state
& (1<<MD_DISK_SYNC
)))
776 /* We have found a good disk to use! */
778 disk
->next
= sra
->devs
;
787 if (slot
< sra
->array
.raid_disks
) {
788 /* didn't find all slots */
794 sra
->devs
= remaining
;
798 /* Remove all 'remaining' devices from the array */
800 struct mdinfo
*sd
= remaining
;
801 remaining
= sd
->next
;
803 sysfs_set_str(sra
, sd
, "state", "faulty");
804 sysfs_set_str(sra
, sd
, "slot", "none");
805 /* for external metadata disks should be removed in mdmon */
806 if (!st
->ss
->external
)
807 sysfs_set_str(sra
, sd
, "state", "remove");
808 sd
->disk
.state
|= (1<<MD_DISK_REMOVED
);
809 sd
->disk
.state
&= ~(1<<MD_DISK_SYNC
);
810 sd
->next
= sra
->devs
;
816 void reshape_free_fdlist(int *fdlist
,
817 unsigned long long *offsets
,
822 for (i
= 0; i
< size
; i
++)
830 int reshape_prepare_fdlist(char *devname
,
834 unsigned long blocks
,
837 unsigned long long *offsets
)
843 for (d
= 0; d
<= nrdisks
; d
++)
846 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
847 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
849 if (sd
->disk
.state
& (1<<MD_DISK_SYNC
)) {
850 char *dn
= map_dev(sd
->disk
.major
,
852 fdlist
[sd
->disk
.raid_disk
]
853 = dev_open(dn
, O_RDONLY
);
854 offsets
[sd
->disk
.raid_disk
] = sd
->data_offset
*512;
855 if (fdlist
[sd
->disk
.raid_disk
] < 0) {
856 pr_err("%s: cannot open component %s\n",
857 devname
, dn
? dn
: "-unknown-");
861 } else if (backup_file
== NULL
) {
863 char *dn
= map_dev(sd
->disk
.major
,
865 fdlist
[d
] = dev_open(dn
, O_RDWR
);
866 offsets
[d
] = (sd
->data_offset
+ sra
->component_size
- blocks
- 8)*512;
868 pr_err("%s: cannot open component %s\n",
869 devname
, dn
? dn
: "-unknown-");
880 int reshape_open_backup_file(char *backup_file
,
885 unsigned long long *offsets
,
888 /* Return 1 on success, 0 on any form of failure */
889 /* need to check backup file is large enough */
895 *fdlist
= open(backup_file
, O_RDWR
|O_CREAT
|(restart
? O_TRUNC
: O_EXCL
),
899 pr_err("%s: cannot create backup file %s: %s\n",
900 devname
, backup_file
, strerror(errno
));
903 /* Guard against backup file being on array device.
904 * If array is partitioned or if LVM etc is in the
905 * way this will not notice, but it is better than
908 fstat(*fdlist
, &stb
);
911 if (stb
.st_rdev
== dev
) {
912 pr_err("backup file must NOT be"
913 " on the array being reshaped.\n");
919 for (i
=0; i
< blocks
+ 8 ; i
++) {
920 if (write(*fdlist
, buf
, 512) != 512) {
921 pr_err("%s: cannot create"
922 " backup file %s: %s\n",
923 devname
, backup_file
, strerror(errno
));
927 if (fsync(*fdlist
) != 0) {
928 pr_err("%s: cannot create backup file %s: %s\n",
929 devname
, backup_file
, strerror(errno
));
936 unsigned long GCD(unsigned long a
, unsigned long b
)
947 unsigned long compute_backup_blocks(int nchunk
, int ochunk
,
948 unsigned int ndata
, unsigned int odata
)
950 unsigned long a
, b
, blocks
;
951 /* So how much do we need to backup.
952 * We need an amount of data which is both a whole number of
953 * old stripes and a whole number of new stripes.
954 * So LCM for (chunksize*datadisks).
956 a
= (ochunk
/512) * odata
;
957 b
= (nchunk
/512) * ndata
;
960 /* LCM == product / GCD */
961 blocks
= (ochunk
/512) * (nchunk
/512) * odata
* ndata
/ a
;
966 char *analyse_change(char *devname
, struct mdinfo
*info
, struct reshape
*re
)
968 /* Based on the current array state in info->array and
969 * the changes in info->new_* etc, determine:
970 * - whether the change is possible
971 * - Intermediate level/raid_disks/layout
972 * - whether a restriping reshape is needed
973 * - number of sectors in minimum change unit. This
974 * will cover a whole number of stripes in 'before' and
977 * Return message if the change should be rejected
978 * NULL if the change can be achieved
980 * This can be called as part of starting a reshape, or
981 * when assembling an array that is undergoing reshape.
983 int near
, far
, offset
, copies
;
985 int old_chunk
, new_chunk
;
986 /* delta_parity records change in number of devices
987 * caused by level change
989 int delta_parity
= 0;
991 memset(re
, 0, sizeof(*re
));
993 /* If a new level not explicitly given, we assume no-change */
994 if (info
->new_level
== UnSet
)
995 info
->new_level
= info
->array
.level
;
998 switch (info
->new_level
) {
1004 /* chunk size is meaningful, must divide component_size
1007 if (info
->component_size
% (info
->new_chunk
/512)) {
1008 unsigned long long shrink
= info
->component_size
;
1009 shrink
&= ~(unsigned long long)(info
->new_chunk
/512-1);
1010 pr_err("New chunk size (%dK) does not evenly divide device size (%lluk)\n",
1011 info
->new_chunk
/1024, info
->component_size
/2);
1012 pr_err("After shrinking any filesystem, \"mdadm --grow %s --size %llu\"\n",
1014 pr_err("will shrink the array so the given chunk size would work.\n");
1019 return "chunk size not meaningful for this level";
1022 info
->new_chunk
= info
->array
.chunk_size
;
1024 switch (info
->array
.level
) {
1026 return "Cannot understand this RAID level";
1028 /* RAID1 can convert to RAID1 with different disks, or
1029 * raid5 with 2 disks, or
1032 if (info
->new_level
> 1 &&
1033 (info
->component_size
& 7))
1034 return "Cannot convert RAID1 of this size - "
1035 "reduce size to multiple of 4K first.";
1036 if (info
->new_level
== 0) {
1037 if (info
->delta_disks
!= UnSet
&&
1038 info
->delta_disks
!= 0)
1039 return "Cannot change number of disks "
1040 "with RAID1->RAID0 conversion";
1042 re
->before
.data_disks
= 1;
1043 re
->after
.data_disks
= 1;
1046 if (info
->new_level
== 1) {
1047 if (info
->delta_disks
== UnSet
)
1048 /* Don't know what to do */
1049 return "no change requested for Growing RAID1";
1053 if (info
->array
.raid_disks
== 2 &&
1054 info
->new_level
== 5) {
1057 re
->before
.data_disks
= 1;
1058 if (info
->delta_disks
!= UnSet
&&
1059 info
->delta_disks
!= 0)
1060 re
->after
.data_disks
= 1 + info
->delta_disks
;
1062 re
->after
.data_disks
= 1;
1063 if (re
->after
.data_disks
< 1)
1064 return "Number of disks too small for RAID5";
1066 re
->before
.layout
= ALGORITHM_LEFT_SYMMETRIC
;
1067 info
->array
.chunk_size
= 65536;
1070 /* Could do some multi-stage conversions, but leave that to
1073 return "Impossibly level change request for RAID1";
1076 /* RAID10 can be converted from near mode to
1077 * RAID0 by removing some devices.
1078 * It can also be reshaped if the kernel supports
1081 switch (info
->new_level
) {
1083 if ((info
->array
.layout
& ~0xff) != 0x100)
1084 return "Cannot Grow RAID10 with far/offset layout";
1085 /* number of devices must be multiple of number of copies */
1086 if (info
->array
.raid_disks
% (info
->array
.layout
& 0xff))
1087 return "RAID10 layout too complex for Grow operation";
1089 new_disks
= (info
->array
.raid_disks
1090 / (info
->array
.layout
& 0xff));
1091 if (info
->delta_disks
== UnSet
)
1092 info
->delta_disks
= (new_disks
1093 - info
->array
.raid_disks
);
1095 if (info
->delta_disks
!= new_disks
- info
->array
.raid_disks
)
1096 return "New number of raid-devices impossible for RAID10";
1097 if (info
->new_chunk
&&
1098 info
->new_chunk
!= info
->array
.chunk_size
)
1099 return "Cannot change chunk-size with RAID10 Grow";
1103 re
->before
.data_disks
= new_disks
;
1104 re
->after
.data_disks
= re
->before
.data_disks
;
1108 near
= info
->array
.layout
& 0xff;
1109 far
= (info
->array
.layout
>> 8) & 0xff;
1110 offset
= info
->array
.layout
& 0x10000;
1111 if (far
> 1 && !offset
)
1112 return "Cannot reshape RAID10 in far-mode";
1113 copies
= near
* far
;
1115 old_chunk
= info
->array
.chunk_size
* far
;
1117 if (info
->new_layout
== UnSet
)
1118 info
->new_layout
= info
->array
.layout
;
1120 near
= info
->new_layout
& 0xff;
1121 far
= (info
->new_layout
>> 8) & 0xff;
1122 offset
= info
->new_layout
& 0x10000;
1123 if (far
> 1 && !offset
)
1124 return "Cannot reshape RAID10 to far-mode";
1125 if (near
* far
!= copies
)
1126 return "Cannot change number of copies"
1127 " when reshaping RAID10";
1129 if (info
->delta_disks
== UnSet
)
1130 info
->delta_disks
= 0;
1131 new_disks
= (info
->array
.raid_disks
+
1134 new_chunk
= info
->new_chunk
* far
;
1137 re
->before
.layout
= info
->array
.layout
;
1138 re
->before
.data_disks
= info
->array
.raid_disks
;
1139 re
->after
.layout
= info
->new_layout
;
1140 re
->after
.data_disks
= new_disks
;
1141 /* For RAID10 we don't do backup but do allow reshape,
1142 * so set backup_blocks to INVALID_SECTORS rather than
1144 * And there is no need to synchronise stripes on both
1145 * 'old' and 'new'. So the important
1146 * number is the minimum data_offset difference
1147 * which is the larger of (offset copies * chunk).
1149 re
->backup_blocks
= INVALID_SECTORS
;
1150 re
->min_offset_change
= max(old_chunk
, new_chunk
) / 512;
1151 if (new_disks
< re
->before
.data_disks
&&
1152 info
->space_after
< re
->min_offset_change
)
1153 /* Reduce component size by one chunk */
1154 re
->new_size
= (info
->component_size
-
1155 re
->min_offset_change
);
1157 re
->new_size
= info
->component_size
;
1158 re
->new_size
= re
->new_size
* new_disks
/ copies
;
1162 return "RAID10 can only be changed to RAID0";
1165 /* RAID0 can be converted to RAID10, or to RAID456 */
1166 if (info
->new_level
== 10) {
1167 if (info
->new_layout
== UnSet
&& info
->delta_disks
== UnSet
) {
1168 /* Assume near=2 layout */
1169 info
->new_layout
= 0x102;
1170 info
->delta_disks
= info
->array
.raid_disks
;
1172 if (info
->new_layout
== UnSet
) {
1173 int copies
= 1 + (info
->delta_disks
1174 / info
->array
.raid_disks
);
1175 if (info
->array
.raid_disks
* (copies
-1)
1176 != info
->delta_disks
)
1177 return "Impossible number of devices"
1178 " for RAID0->RAID10";
1179 info
->new_layout
= 0x100 + copies
;
1181 if (info
->delta_disks
== UnSet
) {
1182 int copies
= info
->new_layout
& 0xff;
1183 if (info
->new_layout
!= 0x100 + copies
)
1184 return "New layout impossible"
1185 " for RAID0->RAID10";;
1186 info
->delta_disks
= (copies
- 1) *
1187 info
->array
.raid_disks
;
1189 if (info
->new_chunk
&&
1190 info
->new_chunk
!= info
->array
.chunk_size
)
1191 return "Cannot change chunk-size with RAID0->RAID10";
1194 re
->before
.data_disks
= (info
->array
.raid_disks
+
1196 re
->after
.data_disks
= re
->before
.data_disks
;
1197 re
->before
.layout
= info
->new_layout
;
1201 /* RAID0 can also covert to RAID0/4/5/6 by first converting to
1202 * a raid4 style layout of the final level.
1204 switch (info
->new_level
) {
1209 re
->before
.layout
= 0;
1214 re
->before
.layout
= ALGORITHM_PARITY_N
;
1215 if (info
->new_layout
== UnSet
)
1216 info
->new_layout
= map_name(r5layout
, "default");
1221 re
->before
.layout
= ALGORITHM_PARITY_N
;
1222 if (info
->new_layout
== UnSet
)
1223 info
->new_layout
= map_name(r6layout
, "default");
1226 return "Impossible level change requested";
1228 re
->before
.data_disks
= info
->array
.raid_disks
;
1229 /* determining 'after' layout happens outside this 'switch' */
1233 info
->array
.layout
= ALGORITHM_PARITY_N
;
1235 switch (info
->new_level
) {
1239 re
->level
= info
->array
.level
;
1240 re
->before
.data_disks
= info
->array
.raid_disks
- 1;
1241 re
->before
.layout
= info
->array
.layout
;
1245 re
->before
.data_disks
= info
->array
.raid_disks
- 1;
1246 re
->before
.layout
= info
->array
.layout
;
1251 re
->before
.data_disks
= info
->array
.raid_disks
- 1;
1252 switch (info
->array
.layout
) {
1253 case ALGORITHM_LEFT_ASYMMETRIC
:
1254 re
->before
.layout
= ALGORITHM_LEFT_ASYMMETRIC_6
;
1256 case ALGORITHM_RIGHT_ASYMMETRIC
:
1257 re
->before
.layout
= ALGORITHM_RIGHT_ASYMMETRIC_6
;
1259 case ALGORITHM_LEFT_SYMMETRIC
:
1260 re
->before
.layout
= ALGORITHM_LEFT_SYMMETRIC_6
;
1262 case ALGORITHM_RIGHT_SYMMETRIC
:
1263 re
->before
.layout
= ALGORITHM_RIGHT_SYMMETRIC_6
;
1265 case ALGORITHM_PARITY_0
:
1266 re
->before
.layout
= ALGORITHM_PARITY_0_6
;
1268 case ALGORITHM_PARITY_N
:
1269 re
->before
.layout
= ALGORITHM_PARITY_N_6
;
1272 return "Cannot convert an array with this layout";
1276 if (info
->array
.raid_disks
!= 2)
1277 return "Can only convert a 2-device array to RAID1";
1278 if (info
->delta_disks
!= UnSet
&&
1279 info
->delta_disks
!= 0)
1280 return "Cannot set raid_disk when "
1281 "converting RAID5->RAID1";
1283 info
->new_chunk
= 0;
1286 return "Impossible level change requested";
1290 switch (info
->new_level
) {
1296 re
->before
.data_disks
= info
->array
.raid_disks
- 2;
1297 re
->before
.layout
= info
->array
.layout
;
1300 return "Impossible level change requested";
1305 /* If we reached here then it looks like a re-stripe is
1306 * happening. We have determined the intermediate level
1307 * and initial raid_disks/layout and stored these in 're'.
1309 * We need to deduce the final layout that can be atomically
1310 * converted to the end state.
1312 switch (info
->new_level
) {
1314 /* We can only get to RAID0 from RAID4 or RAID5
1315 * with appropriate layout and one extra device
1317 if (re
->level
!= 4 && re
->level
!= 5)
1318 return "Cannot covert to RAID0 from this level";
1320 switch (re
->level
) {
1322 re
->before
.layout
= 0;
1323 re
->after
.layout
= 0;
1326 re
->after
.layout
= ALGORITHM_PARITY_N
;
1332 /* We can only get to RAID4 from RAID5 */
1333 if (re
->level
!= 4 && re
->level
!= 5)
1334 return "Cannot convert to RAID4 from this level";
1336 switch (re
->level
) {
1338 re
->before
.layout
= 0;
1339 re
->after
.layout
= 0;
1342 re
->after
.layout
= ALGORITHM_PARITY_N
;
1348 /* We get to RAID5 from RAID5 or RAID6 */
1349 if (re
->level
!= 5 && re
->level
!= 6)
1350 return "Cannot convert to RAID5 from this level";
1352 switch (re
->level
) {
1354 if (info
->new_layout
== UnSet
)
1355 re
->after
.layout
= re
->before
.layout
;
1357 re
->after
.layout
= info
->new_layout
;
1360 if (info
->new_layout
== UnSet
)
1361 info
->new_layout
= re
->before
.layout
;
1363 /* after.layout needs to be raid6 version of new_layout */
1364 if (info
->new_layout
== ALGORITHM_PARITY_N
)
1365 re
->after
.layout
= ALGORITHM_PARITY_N
;
1368 char *ls
= map_num(r5layout
, info
->new_layout
);
1371 /* Current RAID6 layout has a RAID5
1374 strcat(strcpy(layout
, ls
), "-6");
1375 l
= map_name(r6layout
, layout
);
1377 return "Cannot find RAID6 layout"
1380 /* Current RAID6 has no equivalent.
1381 * If it is already a '-6' layout we
1382 * can leave it unchanged, else we must
1385 ls
= map_num(r6layout
, info
->new_layout
);
1387 strcmp(ls
+strlen(ls
)-2, "-6") != 0)
1388 return "Please specify new layout";
1389 l
= info
->new_layout
;
1391 re
->after
.layout
= l
;
1397 /* We must already be at level 6 */
1399 return "Impossible level change";
1400 if (info
->new_layout
== UnSet
)
1401 re
->after
.layout
= info
->array
.layout
;
1403 re
->after
.layout
= info
->new_layout
;
1406 return "Impossible level change requested";
1408 if (info
->delta_disks
== UnSet
)
1409 info
->delta_disks
= delta_parity
;
1411 re
->after
.data_disks
= (re
->before
.data_disks
1414 switch (re
->level
) {
1415 case 6: re
->parity
= 2;
1418 case 5: re
->parity
= 1;
1420 default: re
->parity
= 0;
1423 /* So we have a restripe operation, we need to calculate the number
1424 * of blocks per reshape operation.
1426 re
->new_size
= info
->component_size
* re
->before
.data_disks
;
1427 if (info
->new_chunk
== 0)
1428 info
->new_chunk
= info
->array
.chunk_size
;
1429 if (re
->after
.data_disks
== re
->before
.data_disks
&&
1430 re
->after
.layout
== re
->before
.layout
&&
1431 info
->new_chunk
== info
->array
.chunk_size
) {
1432 /* Nothing to change, can change level immediately. */
1433 re
->level
= info
->new_level
;
1434 re
->backup_blocks
= 0;
1437 if (re
->after
.data_disks
== 1 && re
->before
.data_disks
== 1) {
1438 /* chunk and layout changes make no difference */
1439 re
->level
= info
->new_level
;
1440 re
->backup_blocks
= 0;
1444 if (re
->after
.data_disks
== re
->before
.data_disks
&&
1445 get_linux_version() < 2006032)
1446 return "in-place reshape is not safe before 2.6.32 - sorry.";
1448 if (re
->after
.data_disks
< re
->before
.data_disks
&&
1449 get_linux_version() < 2006030)
1450 return "reshape to fewer devices is not supported before 2.6.30 - sorry.";
1452 re
->backup_blocks
= compute_backup_blocks(
1453 info
->new_chunk
, info
->array
.chunk_size
,
1454 re
->after
.data_disks
,
1455 re
->before
.data_disks
);
1456 re
->min_offset_change
= re
->backup_blocks
/ re
->before
.data_disks
;
1458 re
->new_size
= info
->component_size
* re
->after
.data_disks
;
1462 static int set_array_size(struct supertype
*st
, struct mdinfo
*sra
,
1465 struct mdinfo
*info
;
1469 if ((st
== NULL
) || (sra
== NULL
))
1472 if (text_version
== NULL
)
1473 text_version
= sra
->text_version
;
1474 subarray
= strchr(text_version
+1, '/')+1;
1475 info
= st
->ss
->container_content(st
, subarray
);
1477 unsigned long long current_size
= 0;
1478 unsigned long long new_size
=
1479 info
->custom_array_size
/2;
1481 if (sysfs_get_ll(sra
, NULL
, "array_size", ¤t_size
) == 0 &&
1482 new_size
> current_size
) {
1483 if (sysfs_set_num(sra
, NULL
, "array_size", new_size
)
1485 dprintf("Error: Cannot set array size");
1488 dprintf("Array size changed");
1490 dprintf(" from %llu to %llu.\n",
1491 current_size
, new_size
);
1495 dprintf("Error: set_array_size(): info pointer in NULL\n");
1500 static int reshape_array(char *container
, int fd
, char *devname
,
1501 struct supertype
*st
, struct mdinfo
*info
,
1502 int force
, struct mddev_dev
*devlist
,
1503 unsigned long long data_offset
,
1504 char *backup_file
, int verbose
, int forked
,
1505 int restart
, int freeze_reshape
);
1506 static int reshape_container(char *container
, char *devname
,
1508 struct supertype
*st
,
1509 struct mdinfo
*info
,
1512 int verbose
, int restart
, int freeze_reshape
);
1514 int Grow_reshape(char *devname
, int fd
,
1515 struct mddev_dev
*devlist
,
1516 unsigned long long data_offset
,
1517 struct context
*c
, struct shape
*s
)
1519 /* Make some changes in the shape of an array.
1520 * The kernel must support the change.
1522 * There are three different changes. Each can trigger
1523 * a resync or recovery so we freeze that until we have
1524 * requested everything (if kernel supports freezing - 2.6.30).
1526 * - change size (i.e. component_size)
1528 * - change layout/chunksize/ndisks
1530 * The last can require a reshape. It is different on different
1531 * levels so we need to check the level before actioning it.
1532 * Some times the level change needs to be requested after the
1533 * reshape (e.g. raid6->raid5, raid5->raid0)
1536 struct mdu_array_info_s array
;
1538 struct supertype
*st
;
1539 char *subarray
= NULL
;
1543 char *container
= NULL
;
1546 struct mddev_dev
*dv
;
1552 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) < 0) {
1553 pr_err("%s is not an active md array - aborting\n",
1557 if (data_offset
!= INVALID_SECTORS
&& array
.level
!= 10
1558 && (array
.level
< 4 || array
.level
> 6)) {
1559 pr_err("--grow --data-offset not yet supported\n");
1564 (s
->chunk
|| s
->level
!= UnSet
|| s
->layout_str
|| s
->raiddisks
)) {
1565 pr_err("cannot change component size at the same time "
1566 "as other changes.\n"
1567 " Change size first, then check data is intact before "
1568 "making other changes.\n");
1572 if (s
->raiddisks
&& s
->raiddisks
< array
.raid_disks
&& array
.level
> 1 &&
1573 get_linux_version() < 2006032 &&
1574 !check_env("MDADM_FORCE_FEWER")) {
1575 pr_err("reducing the number of devices is not safe before Linux 2.6.32\n"
1576 " Please use a newer kernel\n");
1580 st
= super_by_fd(fd
, &subarray
);
1582 pr_err("Unable to determine metadata format for %s\n", devname
);
1585 if (s
->raiddisks
> st
->max_devs
) {
1586 pr_err("Cannot increase raid-disks on this array"
1587 " beyond %d\n", st
->max_devs
);
1591 /* in the external case we need to check that the requested reshape is
1592 * supported, and perform an initial check that the container holds the
1593 * pre-requisite spare devices (mdmon owns final validation)
1595 if (st
->ss
->external
) {
1599 container
= st
->container_devnm
;
1600 cfd
= open_dev_excl(st
->container_devnm
);
1602 container
= st
->devnm
;
1604 cfd
= open_dev_excl(st
->devnm
);
1608 pr_err("Unable to open container for %s\n",
1614 rv
= st
->ss
->load_container(st
, cfd
, NULL
);
1617 pr_err("Cannot read superblock for %s\n",
1623 /* check if operation is supported for metadata handler */
1624 if (st
->ss
->container_content
) {
1625 struct mdinfo
*cc
= NULL
;
1626 struct mdinfo
*content
= NULL
;
1628 cc
= st
->ss
->container_content(st
, subarray
);
1629 for (content
= cc
; content
; content
= content
->next
) {
1630 int allow_reshape
= 1;
1632 /* check if reshape is allowed based on metadata
1633 * indications stored in content.array.status
1635 if (content
->array
.state
& (1<<MD_SB_BLOCK_VOLUME
))
1637 if (content
->array
.state
1638 & (1<<MD_SB_BLOCK_CONTAINER_RESHAPE
))
1640 if (!allow_reshape
) {
1641 pr_err("cannot reshape arrays in"
1642 " container with unsupported"
1643 " metadata: %s(%s)\n",
1644 devname
, container
);
1652 if (mdmon_running(container
))
1653 st
->update_tail
= &st
->updates
;
1657 for (dv
= devlist
; dv
; dv
= dv
->next
)
1659 if (s
->raiddisks
> array
.raid_disks
&&
1660 array
.spare_disks
+added_disks
< (s
->raiddisks
- array
.raid_disks
) &&
1662 pr_err("Need %d spare%s to avoid degraded array,"
1663 " and only have %d.\n"
1664 " Use --force to over-ride this check.\n",
1665 s
->raiddisks
- array
.raid_disks
,
1666 s
->raiddisks
- array
.raid_disks
== 1 ? "" : "s",
1667 array
.spare_disks
+ added_disks
);
1671 sra
= sysfs_read(fd
, NULL
, GET_LEVEL
| GET_DISKS
| GET_DEVS
1672 | GET_STATE
| GET_VERSION
);
1674 if (st
->ss
->external
&& subarray
== NULL
) {
1675 array
.level
= LEVEL_CONTAINER
;
1676 sra
->array
.level
= LEVEL_CONTAINER
;
1679 pr_err("failed to read sysfs parameters for %s\n",
1683 frozen
= freeze(st
);
1685 /* freeze() already spewed the reason */
1688 } else if (frozen
< 0) {
1689 pr_err("%s is performing resync/recovery and cannot"
1690 " be reshaped\n", devname
);
1695 /* ========= set size =============== */
1696 if (s
->size
> 0 && (s
->size
== MAX_SIZE
|| s
->size
!= (unsigned)array
.size
)) {
1697 unsigned long long orig_size
= get_component_size(fd
)/2;
1698 unsigned long long min_csize
;
1700 int raid0_takeover
= 0;
1703 orig_size
= (unsigned) array
.size
;
1705 if (orig_size
== 0) {
1706 pr_err("Cannot set device size in this type of array.\n");
1711 if (reshape_super(st
, s
->size
, UnSet
, UnSet
, 0, 0, UnSet
, NULL
,
1712 devname
, APPLY_METADATA_CHANGES
, c
->verbose
> 0)) {
1717 if (st
->ss
->external
) {
1718 /* metadata can have size limitation
1719 * update size value according to metadata information
1721 struct mdinfo
*sizeinfo
=
1722 st
->ss
->container_content(st
, subarray
);
1724 unsigned long long new_size
=
1725 sizeinfo
->custom_array_size
/2;
1726 int data_disks
= get_data_disks(
1727 sizeinfo
->array
.level
,
1728 sizeinfo
->array
.layout
,
1729 sizeinfo
->array
.raid_disks
);
1730 new_size
/= data_disks
;
1731 dprintf("Metadata size correction from %llu to "
1732 "%llu (%llu)\n", orig_size
, new_size
,
1733 new_size
* data_disks
);
1735 sysfs_free(sizeinfo
);
1739 /* Update the size of each member device in case
1740 * they have been resized. This will never reduce
1741 * below the current used-size. The "size" attribute
1742 * understands '0' to mean 'max'.
1746 for (mdi
= sra
->devs
; mdi
; mdi
= mdi
->next
) {
1747 if (sysfs_set_num(sra
, mdi
, "size",
1748 s
->size
== MAX_SIZE
? 0 : s
->size
) < 0) {
1749 /* Probably kernel refusing to let us
1750 * reduce the size - not an error.
1754 if (array
.not_persistent
== 0 &&
1755 array
.major_version
== 0 &&
1756 get_linux_version() < 3001000) {
1757 /* Dangerous to allow size to exceed 2TB */
1758 unsigned long long csize
;
1759 if (sysfs_get_ll(sra
, mdi
, "size", &csize
) == 0) {
1760 if (csize
>= 2ULL*1024*1024*1024)
1761 csize
= 2ULL*1024*1024*1024;
1762 if ((min_csize
== 0 || (min_csize
1769 pr_err("Cannot set size on "
1770 "array members.\n");
1771 goto size_change_error
;
1773 if (min_csize
&& s
->size
> min_csize
) {
1774 pr_err("Cannot safely make this array "
1775 "use more than 2TB per device on this kernel.\n");
1777 goto size_change_error
;
1779 if (min_csize
&& s
->size
== MAX_SIZE
) {
1780 /* Don't let the kernel choose a size - it will get
1783 pr_err("Limited v0.90 array to "
1784 "2TB per device\n");
1785 s
->size
= min_csize
;
1787 if (st
->ss
->external
) {
1788 if (sra
->array
.level
== 0) {
1789 rv
= sysfs_set_str(sra
, NULL
, "level",
1793 /* get array parametes after takeover
1794 * to chane one parameter at time only
1796 rv
= ioctl(fd
, GET_ARRAY_INFO
, &array
);
1799 /* make sure mdmon is
1800 * aware of the new level */
1801 if (!mdmon_running(st
->container_devnm
))
1802 start_mdmon(st
->container_devnm
);
1803 ping_monitor(container
);
1804 if (mdmon_running(st
->container_devnm
) &&
1805 st
->update_tail
== NULL
)
1806 st
->update_tail
= &st
->updates
;
1809 if (s
->size
== MAX_SIZE
)
1811 array
.size
= s
->size
;
1812 if ((unsigned)array
.size
!= s
->size
) {
1813 /* got truncated to 32bit, write to
1814 * component_size instead
1817 rv
= sysfs_set_num(sra
, NULL
,
1818 "component_size", s
->size
);
1822 rv
= ioctl(fd
, SET_ARRAY_INFO
, &array
);
1824 /* manage array size when it is managed externally
1826 if ((rv
== 0) && st
->ss
->external
)
1827 rv
= set_array_size(st
, sra
, sra
->text_version
);
1830 if (raid0_takeover
) {
1831 /* do not recync non-existing parity,
1832 * we will drop it anyway
1834 sysfs_set_str(sra
, NULL
, "sync_action", "frozen");
1835 /* go back to raid0, drop parity disk
1837 sysfs_set_str(sra
, NULL
, "level", "raid0");
1838 ioctl(fd
, GET_ARRAY_INFO
, &array
);
1845 /* restore metadata */
1846 if (reshape_super(st
, orig_size
, UnSet
, UnSet
, 0, 0,
1847 UnSet
, NULL
, devname
,
1848 ROLLBACK_METADATA_CHANGES
,
1851 pr_err("Cannot set device size for %s: %s\n",
1852 devname
, strerror(err
));
1854 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
1855 cont_err("Bitmap must be removed before size can be changed\n");
1859 if (s
->assume_clean
) {
1860 /* This will fail on kernels older than 3.0 unless
1861 * a backport has been arranged.
1864 sysfs_set_str(sra
, NULL
, "resync_start", "none") < 0)
1865 pr_err("--assume-clean not supported with --grow on this kernel\n");
1867 ioctl(fd
, GET_ARRAY_INFO
, &array
);
1868 s
->size
= get_component_size(fd
)/2;
1870 s
->size
= array
.size
;
1871 if (c
->verbose
>= 0) {
1872 if (s
->size
== orig_size
)
1873 pr_err("component size of %s "
1874 "unchanged at %lluK\n",
1877 pr_err("component size of %s "
1878 "has been set to %lluK\n",
1882 } else if (array
.level
!= LEVEL_CONTAINER
) {
1883 s
->size
= get_component_size(fd
)/2;
1885 s
->size
= array
.size
;
1888 /* See if there is anything else to do */
1889 if ((s
->level
== UnSet
|| s
->level
== array
.level
) &&
1890 (s
->layout_str
== NULL
) &&
1891 (s
->chunk
== 0 || s
->chunk
== array
.chunk_size
) &&
1892 data_offset
== INVALID_SECTORS
&&
1893 (s
->raiddisks
== 0 || s
->raiddisks
== array
.raid_disks
)) {
1894 /* Nothing more to do */
1895 if (!changed
&& c
->verbose
>= 0)
1896 pr_err("%s: no change requested\n",
1901 /* ========= check for Raid10/Raid1 -> Raid0 conversion ===============
1902 * current implementation assumes that following conditions must be met:
1905 * - near_copies == 2
1907 if ((s
->level
== 0 && array
.level
== 10 && sra
&&
1908 array
.layout
== ((1 << 8) + 2) && !(array
.raid_disks
& 1)) ||
1909 (s
->level
== 0 && array
.level
== 1 && sra
)) {
1911 err
= remove_disks_for_takeover(st
, sra
, array
.layout
);
1913 dprintf(Name
": Array cannot be reshaped\n");
1919 /* Make sure mdmon has seen the device removal
1920 * and updated metadata before we continue with
1924 ping_monitor(container
);
1927 memset(&info
, 0, sizeof(info
));
1929 sysfs_init(&info
, fd
, NULL
);
1930 strcpy(info
.text_version
, sra
->text_version
);
1931 info
.component_size
= s
->size
*2;
1932 info
.new_level
= s
->level
;
1933 info
.new_chunk
= s
->chunk
* 1024;
1934 if (info
.array
.level
== LEVEL_CONTAINER
) {
1935 info
.delta_disks
= UnSet
;
1936 info
.array
.raid_disks
= s
->raiddisks
;
1937 } else if (s
->raiddisks
)
1938 info
.delta_disks
= s
->raiddisks
- info
.array
.raid_disks
;
1940 info
.delta_disks
= UnSet
;
1941 if (s
->layout_str
== NULL
) {
1942 info
.new_layout
= UnSet
;
1943 if (info
.array
.level
== 6 &&
1944 (info
.new_level
== 6 || info
.new_level
== UnSet
) &&
1945 info
.array
.layout
>= 16) {
1946 pr_err("%s has a non-standard layout. If you"
1947 " wish to preserve this\n", devname
);
1948 cont_err("during the reshape, please specify"
1949 " --layout=preserve\n");
1950 cont_err("If you want to change it, specify a"
1951 " layout or use --layout=normalise\n");
1955 } else if (strcmp(s
->layout_str
, "normalise") == 0 ||
1956 strcmp(s
->layout_str
, "normalize") == 0) {
1957 /* If we have a -6 RAID6 layout, remove the '-6'. */
1958 info
.new_layout
= UnSet
;
1959 if (info
.array
.level
== 6 && info
.new_level
== UnSet
) {
1961 strcpy(l
, map_num(r6layout
, info
.array
.layout
));
1962 h
= strrchr(l
, '-');
1963 if (h
&& strcmp(h
, "-6") == 0) {
1965 info
.new_layout
= map_name(r6layout
, l
);
1968 pr_err("%s is only meaningful when reshaping"
1969 " a RAID6 array.\n", s
->layout_str
);
1973 } else if (strcmp(s
->layout_str
, "preserve") == 0) {
1974 /* This means that a non-standard RAID6 layout
1977 * - When reshape a RAID6 (e.g. adding a device)
1978 * which is in a non-standard layout, it is OK
1979 * to preserve that layout.
1980 * - When converting a RAID5 to RAID6, leave it in
1981 * the XXX-6 layout, don't re-layout.
1983 if (info
.array
.level
== 6 && info
.new_level
== UnSet
)
1984 info
.new_layout
= info
.array
.layout
;
1985 else if (info
.array
.level
== 5 && info
.new_level
== 6) {
1987 strcpy(l
, map_num(r5layout
, info
.array
.layout
));
1989 info
.new_layout
= map_name(r6layout
, l
);
1991 pr_err("%s in only meaningful when reshaping"
1992 " to RAID6\n", s
->layout_str
);
1997 int l
= info
.new_level
;
1999 l
= info
.array
.level
;
2002 info
.new_layout
= map_name(r5layout
, s
->layout_str
);
2005 info
.new_layout
= map_name(r6layout
, s
->layout_str
);
2008 info
.new_layout
= parse_layout_10(s
->layout_str
);
2011 info
.new_layout
= parse_layout_faulty(s
->layout_str
);
2014 pr_err("layout not meaningful"
2015 " with this level\n");
2019 if (info
.new_layout
== UnSet
) {
2020 pr_err("layout %s not understood"
2021 " for this level\n",
2028 if (array
.level
== LEVEL_FAULTY
) {
2029 if (s
->level
!= UnSet
&& s
->level
!= array
.level
) {
2030 pr_err("cannot change level of Faulty device\n");
2034 pr_err("cannot set chunksize of Faulty device\n");
2037 if (s
->raiddisks
&& s
->raiddisks
!= 1) {
2038 pr_err("cannot set raid_disks of Faulty device\n");
2041 if (s
->layout_str
) {
2042 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) != 0) {
2043 dprintf("Cannot get array information.\n");
2046 array
.layout
= info
.new_layout
;
2047 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
2048 pr_err("failed to set new layout\n");
2050 } else if (c
->verbose
>= 0)
2051 printf("layout for %s set to %d\n",
2052 devname
, array
.layout
);
2054 } else if (array
.level
== LEVEL_CONTAINER
) {
2055 /* This change is to be applied to every array in the
2056 * container. This is only needed when the metadata imposes
2057 * restraints of the various arrays in the container.
2058 * Currently we only know that IMSM requires all arrays
2059 * to have the same number of devices so changing the
2060 * number of devices (On-Line Capacity Expansion) must be
2061 * performed at the level of the container
2063 rv
= reshape_container(container
, devname
, -1, st
, &info
,
2064 c
->force
, c
->backup_file
, c
->verbose
, 0, 0);
2067 /* get spare devices from external metadata
2069 if (st
->ss
->external
) {
2070 struct mdinfo
*info2
;
2072 info2
= st
->ss
->container_content(st
, subarray
);
2074 info
.array
.spare_disks
=
2075 info2
->array
.spare_disks
;
2080 /* Impose these changes on a single array. First
2081 * check that the metadata is OK with the change. */
2083 if (reshape_super(st
, 0, info
.new_level
,
2084 info
.new_layout
, info
.new_chunk
,
2085 info
.array
.raid_disks
, info
.delta_disks
,
2086 c
->backup_file
, devname
, APPLY_METADATA_CHANGES
,
2092 rv
= reshape_array(container
, fd
, devname
, st
, &info
, c
->force
,
2093 devlist
, data_offset
, c
->backup_file
, c
->verbose
,
2104 /* verify_reshape_position()
2105 * Function checks if reshape position in metadata is not farther
2106 * than position in md.
2108 * 0 : not valid sysfs entry
2109 * it can be caused by not started reshape, it should be started
2110 * by reshape array or raid0 array is before takeover
2111 * -1 : error, reshape position is obviously wrong
2112 * 1 : success, reshape progress correct or updated
2114 static int verify_reshape_position(struct mdinfo
*info
, int level
)
2120 /* read sync_max, failure can mean raid0 array */
2121 rv
= sysfs_get_str(info
, NULL
, "sync_max", buf
, 40);
2125 unsigned long long position
= strtoull(buf
, &ep
, 0);
2127 dprintf(Name
": Read sync_max sysfs entry is: %s\n", buf
);
2128 if (!(ep
== buf
|| (*ep
!= 0 && *ep
!= '\n' && *ep
!= ' '))) {
2129 position
*= get_data_disks(level
,
2131 info
->array
.raid_disks
);
2132 if (info
->reshape_progress
< position
) {
2133 dprintf("Corrected reshape progress (%llu) to "
2134 "md position (%llu)\n",
2135 info
->reshape_progress
, position
);
2136 info
->reshape_progress
= position
;
2138 } else if (info
->reshape_progress
> position
) {
2139 pr_err("Fatal error: array "
2140 "reshape was not properly frozen "
2141 "(expected reshape position is %llu, "
2142 "but reshape progress is %llu.\n",
2143 position
, info
->reshape_progress
);
2146 dprintf("Reshape position in md and metadata "
2151 } else if (rv
== 0) {
2152 /* for valid sysfs entry, 0-length content
2153 * should be indicated as error
2161 static unsigned long long choose_offset(unsigned long long lo
,
2162 unsigned long long hi
,
2163 unsigned long long min
,
2164 unsigned long long max
)
2166 /* Choose a new offset between hi and lo.
2167 * It must be between min and max, but
2168 * we would prefer something near the middle of hi/lo, and also
2169 * prefer to be aligned to a big power of 2.
2171 * So we start with the middle, then for each bit,
2172 * starting at '1' and increasing, if it is set, we either
2173 * add it or subtract it if possible, preferring the option
2174 * which is furthest from the boundary.
2176 * We stop once we get a 1MB alignment. As units are in sectors,
2177 * 1MB = 2*1024 sectors.
2179 unsigned long long choice
= (lo
+ hi
) / 2;
2180 unsigned long long bit
= 1;
2182 for (bit
= 1; bit
< 2*1024; bit
= bit
<< 1) {
2183 unsigned long long bigger
, smaller
;
2184 if (! (bit
& choice
))
2186 bigger
= choice
+ bit
;
2187 smaller
= choice
- bit
;
2188 if (bigger
> max
&& smaller
< min
)
2192 else if (smaller
< min
)
2194 else if (hi
- bigger
> smaller
- lo
)
2202 static int set_new_data_offset(struct mdinfo
*sra
, struct supertype
*st
,
2203 char *devname
, int delta_disks
,
2204 unsigned long long data_offset
,
2205 unsigned long long min
)
2210 unsigned long long before
, after
;
2212 /* Need to find min space before and after so same is used
2215 before
= UINT64_MAX
;
2217 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
2221 struct supertype
*st2
;
2222 struct mdinfo info2
;
2224 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
2226 dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 0);
2227 dfd
= dev_open(dn
, O_RDONLY
);
2229 pr_err("%s: cannot open component %s\n",
2230 devname
, dn
? dn
: "-unknown-");
2233 st2
= dup_super(st
);
2234 rv
= st2
->ss
->load_super(st2
,dfd
, NULL
);
2238 pr_err("%s: cannot get superblock from %s\n",
2242 st2
->ss
->getinfo_super(st2
, &info2
, NULL
);
2243 st2
->ss
->free_super(st2
);
2245 if (info2
.space_before
== 0 &&
2246 info2
.space_after
== 0) {
2247 /* Metadata doesn't support data_offset changes */
2250 if (before
> info2
.space_before
)
2251 before
= info2
.space_before
;
2252 if (after
> info2
.space_after
)
2253 after
= info2
.space_after
;
2255 if (data_offset
!= INVALID_SECTORS
) {
2257 if (info2
.data_offset
== data_offset
) {
2258 pr_err("%s: already has that data_offset\n",
2262 if (data_offset
< info2
.data_offset
)
2266 } else if ((data_offset
<= info2
.data_offset
&& dir
== 1) ||
2267 (data_offset
>= info2
.data_offset
&& dir
== -1)) {
2268 pr_err("%s: differing data offsets on devices make this --data-offset setting impossible\n",
2274 if (before
== UINT64_MAX
)
2275 /* impossible really, there must be no devices */
2278 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
2279 char *dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 0);
2280 unsigned long long new_data_offset
;
2282 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
2284 if (delta_disks
< 0) {
2285 /* Don't need any space as array is shrinking
2286 * just move data_offset up by min
2288 if (data_offset
== INVALID_SECTORS
)
2289 new_data_offset
= sd
->data_offset
+ min
;
2291 if (data_offset
< sd
->data_offset
+ min
) {
2292 pr_err("--data-offset too small for %s\n",
2296 new_data_offset
= data_offset
;
2298 } else if (delta_disks
> 0) {
2299 /* need space before */
2301 pr_err("Insufficient head-space for reshape on %s\n",
2305 if (data_offset
== INVALID_SECTORS
)
2306 new_data_offset
= sd
->data_offset
- min
;
2308 if (data_offset
> sd
->data_offset
- min
) {
2309 pr_err("--data-offset too large for %s\n",
2313 new_data_offset
= data_offset
;
2317 /* can move up or down. If 'data_offset'
2318 * was set we would have already decided,
2319 * so just choose direction with most space.
2326 sysfs_set_str(sra
, NULL
, "reshape_direction",
2327 dir
== 1 ? "backwards" : "forwards");
2329 /* Increase data offset */
2331 pr_err("Insufficient tail-space for reshape on %s\n",
2335 if (data_offset
!= INVALID_SECTORS
&&
2336 data_offset
< sd
->data_offset
+ min
) {
2337 pr_err("--data-offset too small on %s\n",
2341 if (data_offset
!= INVALID_SECTORS
)
2342 new_data_offset
= data_offset
;
2344 new_data_offset
= choose_offset(sd
->data_offset
,
2345 sd
->data_offset
+ after
,
2346 sd
->data_offset
+ min
,
2347 sd
->data_offset
+ after
);
2349 /* Decrease data offset */
2351 pr_err("insufficient head-room on %s\n",
2355 if (data_offset
!= INVALID_SECTORS
&&
2356 data_offset
< sd
->data_offset
- min
) {
2357 pr_err("--data-offset too small on %s\n",
2361 if (data_offset
!= INVALID_SECTORS
)
2362 new_data_offset
= data_offset
;
2364 new_data_offset
= choose_offset(sd
->data_offset
- before
,
2366 sd
->data_offset
- before
,
2367 sd
->data_offset
- min
);
2370 err
= sysfs_set_num(sra
, sd
, "new_offset", new_data_offset
);
2371 if (err
< 0 && errno
== E2BIG
) {
2372 /* try again after increasing data size to max */
2373 err
= sysfs_set_num(sra
, sd
, "size", 0);
2374 if (err
< 0 && errno
== EINVAL
&&
2375 !(sd
->disk
.state
& (1<<MD_DISK_SYNC
))) {
2376 /* some kernels have a bug where you cannot
2377 * use '0' on spare devices. */
2378 sysfs_set_num(sra
, sd
, "size",
2379 (sra
->component_size
+ after
)/2);
2381 err
= sysfs_set_num(sra
, sd
, "new_offset",
2385 if (errno
== E2BIG
&& data_offset
!= INVALID_SECTORS
) {
2386 pr_err("data-offset is too big for %s\n",
2390 if (sd
== sra
->devs
&&
2391 (errno
== ENOENT
|| errno
== E2BIG
))
2392 /* Early kernel, no 'new_offset' file,
2393 * or kernel doesn't like us.
2394 * For RAID5/6 this is not fatal
2397 pr_err("Cannot set new_offset for %s\n",
2407 static int raid10_reshape(char *container
, int fd
, char *devname
,
2408 struct supertype
*st
, struct mdinfo
*info
,
2409 struct reshape
*reshape
,
2410 unsigned long long data_offset
,
2411 int force
, int verbose
)
2413 /* Changing raid_disks, layout, chunksize or possibly
2414 * just data_offset for a RAID10.
2415 * We must always change data_offset. We change by at least
2416 * ->min_offset_change which is the largest of the old and new
2418 * If raid_disks is increasing, then data_offset must decrease
2419 * by at least this copy size.
2420 * If raid_disks is unchanged, data_offset must increase or
2421 * decrease by at least min_offset_change but preferably by much more.
2422 * We choose half of the available space.
2423 * If raid_disks is decreasing, data_offset must increase by
2424 * at least min_offset_change. To allow of this, component_size
2425 * must be decreased by the same amount.
2427 * So we calculate the required minimum and direction, possibly
2428 * reduce the component_size, then iterate through the devices
2429 * and set the new_data_offset.
2430 * If that all works, we set chunk_size, layout, raid_disks, and start
2434 unsigned long long min
;
2437 sra
= sysfs_read(fd
, NULL
,
2438 GET_COMPONENT
|GET_DEVS
|GET_OFFSET
|GET_STATE
|GET_CHUNK
2441 pr_err("%s: Cannot get array details from sysfs\n",
2445 min
= reshape
->min_offset_change
;
2447 if (info
->delta_disks
)
2448 sysfs_set_str(sra
, NULL
, "reshape_direction",
2449 info
->delta_disks
< 0 ? "backwards" : "forwards");
2450 if (info
->delta_disks
< 0 &&
2451 info
->space_after
< min
) {
2452 int rv
= sysfs_set_num(sra
, NULL
, "component_size",
2453 (sra
->component_size
-
2456 pr_err("cannot reduce component size\n");
2460 err
= set_new_data_offset(sra
, st
, devname
, info
->delta_disks
, data_offset
,
2463 pr_err("Cannot set new_data_offset: RAID10 reshape not\n");
2464 cont_err("supported on this kernel\n");
2470 if (!err
&& sysfs_set_num(sra
, NULL
, "chunk_size", info
->new_chunk
) < 0)
2472 if (!err
&& sysfs_set_num(sra
, NULL
, "layout", reshape
->after
.layout
) < 0)
2474 if (!err
&& sysfs_set_num(sra
, NULL
, "raid_disks",
2475 info
->array
.raid_disks
+ info
->delta_disks
) < 0)
2477 if (!err
&& sysfs_set_str(sra
, NULL
, "sync_action", "reshape") < 0)
2480 pr_err("Cannot set array shape for %s\n",
2483 (info
->array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2484 cont_err(" Bitmap must be removed before"
2485 " shape can be changed\n");
2495 static void get_space_after(int fd
, struct supertype
*st
, struct mdinfo
*info
)
2497 struct mdinfo
*sra
, *sd
;
2498 /* Initialisation to silence compiler warning */
2499 unsigned long long min_space_before
= 0, min_space_after
= 0;
2502 sra
= sysfs_read(fd
, NULL
, GET_DEVS
);
2505 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
2508 struct supertype
*st2
;
2509 struct mdinfo info2
;
2511 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
2513 dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 0);
2514 dfd
= dev_open(dn
, O_RDONLY
);
2517 st2
= dup_super(st
);
2518 if (st2
->ss
->load_super(st2
,dfd
, NULL
)) {
2524 st2
->ss
->getinfo_super(st2
, &info2
, NULL
);
2525 st2
->ss
->free_super(st2
);
2528 min_space_before
> info2
.space_before
)
2529 min_space_before
= info2
.space_before
;
2531 min_space_after
> info2
.space_after
)
2532 min_space_after
= info2
.space_after
;
2535 if (sd
== NULL
&& !first
) {
2536 info
->space_after
= min_space_after
;
2537 info
->space_before
= min_space_before
;
2542 static void update_cache_size(char *container
, struct mdinfo
*sra
,
2543 struct mdinfo
*info
,
2544 int disks
, unsigned long long blocks
)
2546 /* Check that the internal stripe cache is
2547 * large enough, or it won't work.
2548 * It must hold at least 4 stripes of the larger
2551 unsigned long cache
;
2552 cache
= max(info
->array
.chunk_size
, info
->new_chunk
);
2553 cache
*= 4; /* 4 stripes minimum */
2554 cache
/= 512; /* convert to sectors */
2555 /* make sure there is room for 'blocks' with a bit to spare */
2556 if (cache
< 16 + blocks
/ disks
)
2557 cache
= 16 + blocks
/ disks
;
2558 cache
/= (4096/512); /* Covert from sectors to pages */
2560 if (sra
->cache_size
< cache
)
2561 subarray_set_num(container
, sra
, "stripe_cache_size",
2565 static int impose_reshape(struct mdinfo
*sra
,
2566 struct mdinfo
*info
,
2567 struct supertype
*st
,
2570 char *devname
, char *container
,
2571 struct reshape
*reshape
)
2573 struct mdu_array_info_s array
;
2575 sra
->new_chunk
= info
->new_chunk
;
2578 /* for external metadata checkpoint saved by mdmon can be lost
2579 * or missed /due to e.g. crash/. Check if md is not during
2580 * restart farther than metadata points to.
2581 * If so, this means metadata information is obsolete.
2583 if (st
->ss
->external
)
2584 verify_reshape_position(info
, reshape
->level
);
2585 sra
->reshape_progress
= info
->reshape_progress
;
2587 sra
->reshape_progress
= 0;
2588 if (reshape
->after
.data_disks
< reshape
->before
.data_disks
)
2589 /* start from the end of the new array */
2590 sra
->reshape_progress
= (sra
->component_size
2591 * reshape
->after
.data_disks
);
2594 ioctl(fd
, GET_ARRAY_INFO
, &array
);
2595 if (info
->array
.chunk_size
== info
->new_chunk
&&
2596 reshape
->before
.layout
== reshape
->after
.layout
&&
2597 st
->ss
->external
== 0) {
2598 /* use SET_ARRAY_INFO but only if reshape hasn't started */
2599 array
.raid_disks
= reshape
->after
.data_disks
+ reshape
->parity
;
2601 ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
2604 pr_err("Cannot set device shape for %s: %s\n",
2605 devname
, strerror(errno
));
2608 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2609 cont_err("Bitmap must be removed before"
2610 " shape can be changed\n");
2614 } else if (!restart
) {
2615 /* set them all just in case some old 'new_*' value
2616 * persists from some earlier problem.
2619 if (sysfs_set_num(sra
, NULL
, "chunk_size", info
->new_chunk
) < 0)
2621 if (!err
&& sysfs_set_num(sra
, NULL
, "layout",
2622 reshape
->after
.layout
) < 0)
2624 if (!err
&& subarray_set_num(container
, sra
, "raid_disks",
2625 reshape
->after
.data_disks
+
2626 reshape
->parity
) < 0)
2629 pr_err("Cannot set device shape for %s\n",
2633 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2634 cont_err("Bitmap must be removed before"
2635 " shape can be changed\n");
2644 static int impose_level(int fd
, int level
, char *devname
, int verbose
)
2647 struct mdu_array_info_s array
;
2649 sysfs_init(&info
, fd
, NULL
);
2651 ioctl(fd
, GET_ARRAY_INFO
, &array
);
2653 (array
.level
>= 4 && array
.level
<= 6)) {
2654 /* To convert to RAID0 we need to fail and
2655 * remove any non-data devices. */
2658 int data_disks
= array
.raid_disks
- 1;
2659 if (array
.level
== 6)
2661 if (array
.level
== 5 &&
2662 array
.layout
!= ALGORITHM_PARITY_N
)
2664 if (array
.level
== 6 &&
2665 array
.layout
!= ALGORITHM_PARITY_N_6
)
2667 sysfs_set_str(&info
, NULL
,"sync_action", "idle");
2668 /* First remove any spares so no recovery starts */
2669 for (d
= 0, found
= 0;
2670 d
< MAX_DISKS
&& found
< array
.nr_disks
;
2672 mdu_disk_info_t disk
;
2674 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
2676 if (disk
.major
== 0 && disk
.minor
== 0)
2679 if ((disk
.state
& (1 << MD_DISK_ACTIVE
))
2680 && disk
.raid_disk
< data_disks
)
2683 ioctl(fd
, HOT_REMOVE_DISK
,
2684 makedev(disk
.major
, disk
.minor
));
2686 /* Now fail anything left */
2687 ioctl(fd
, GET_ARRAY_INFO
, &array
);
2688 for (d
= 0, found
= 0;
2689 d
< MAX_DISKS
&& found
< array
.nr_disks
;
2692 mdu_disk_info_t disk
;
2694 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
2696 if (disk
.major
== 0 && disk
.minor
== 0)
2699 if ((disk
.state
& (1 << MD_DISK_ACTIVE
))
2700 && disk
.raid_disk
< data_disks
)
2703 ioctl(fd
, SET_DISK_FAULTY
,
2704 makedev(disk
.major
, disk
.minor
));
2706 while (ioctl(fd
, HOT_REMOVE_DISK
,
2707 makedev(disk
.major
, disk
.minor
)) < 0
2714 c
= map_num(pers
, level
);
2716 int err
= sysfs_set_str(&info
, NULL
, "level", c
);
2719 pr_err("%s: could not set level to %s\n",
2722 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2723 cont_err("Bitmap must be removed"
2724 " before level can be changed\n");
2728 pr_err("level of %s changed to %s\n",
2734 static int reshape_array(char *container
, int fd
, char *devname
,
2735 struct supertype
*st
, struct mdinfo
*info
,
2736 int force
, struct mddev_dev
*devlist
,
2737 unsigned long long data_offset
,
2738 char *backup_file
, int verbose
, int forked
,
2739 int restart
, int freeze_reshape
)
2741 struct reshape reshape
;
2744 int orig_level
= UnSet
;
2748 struct mdu_array_info_s array
;
2751 struct mddev_dev
*dv
;
2755 unsigned long long *offsets
= NULL
;
2759 unsigned long blocks
;
2760 unsigned long long array_size
;
2762 struct mdinfo
*sra
= NULL
;
2764 /* when reshaping a RAID0, the component_size might be zero.
2765 * So try to fix that up.
2767 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) != 0) {
2768 dprintf("Cannot get array information.\n");
2771 if (array
.level
== 0 && info
->component_size
== 0) {
2772 get_dev_size(fd
, NULL
, &array_size
);
2773 info
->component_size
= array_size
/ array
.raid_disks
;
2776 if (array
.level
== 10)
2777 /* Need space_after info */
2778 get_space_after(fd
, st
, info
);
2780 if (info
->reshape_active
) {
2781 int new_level
= info
->new_level
;
2782 info
->new_level
= UnSet
;
2783 if (info
->delta_disks
> 0)
2784 info
->array
.raid_disks
-= info
->delta_disks
;
2785 msg
= analyse_change(devname
, info
, &reshape
);
2786 info
->new_level
= new_level
;
2787 if (info
->delta_disks
> 0)
2788 info
->array
.raid_disks
+= info
->delta_disks
;
2790 /* Make sure the array isn't read-only */
2791 ioctl(fd
, RESTART_ARRAY_RW
, 0);
2793 msg
= analyse_change(devname
, info
, &reshape
);
2795 /* if msg == "", error has already been printed */
2797 pr_err("%s\n", msg
);
2801 (reshape
.level
!= info
->array
.level
||
2802 reshape
.before
.layout
!= info
->array
.layout
||
2803 reshape
.before
.data_disks
+ reshape
.parity
2804 != info
->array
.raid_disks
- max(0, info
->delta_disks
))) {
2805 pr_err("reshape info is not in native format -"
2806 " cannot continue.\n");
2810 if (st
->ss
->external
&& restart
&& (info
->reshape_progress
== 0)) {
2811 /* When reshape is restarted from '0', very begin of array
2812 * it is possible that for external metadata reshape and array
2813 * configuration doesn't happen.
2814 * Check if md has the same opinion, and reshape is restarted
2815 * from 0. If so, this is regular reshape start after reshape
2816 * switch in metadata to next array only.
2818 if ((verify_reshape_position(info
, reshape
.level
) >= 0) &&
2819 (info
->reshape_progress
== 0))
2823 /* reshape already started. just skip to monitoring the reshape */
2824 if (reshape
.backup_blocks
== 0)
2826 if (restart
& RESHAPE_NO_BACKUP
)
2830 /* The container is frozen but the array may not be.
2831 * So freeze the array so spares don't get put to the wrong use
2832 * FIXME there should probably be a cleaner separation between
2833 * freeze_array and freeze_container.
2835 sysfs_freeze_array(info
);
2836 /* Check we have enough spares to not be degraded */
2838 for (dv
= devlist
; dv
; dv
=dv
->next
)
2840 spares_needed
= max(reshape
.before
.data_disks
,
2841 reshape
.after
.data_disks
)
2842 + reshape
.parity
- array
.raid_disks
;
2845 info
->new_level
> 1 && info
->array
.level
> 1 &&
2846 spares_needed
> info
->array
.spare_disks
+ added_disks
) {
2847 pr_err("Need %d spare%s to avoid degraded array,"
2848 " and only have %d.\n"
2849 " Use --force to over-ride this check.\n",
2851 spares_needed
== 1 ? "" : "s",
2852 info
->array
.spare_disks
+ added_disks
);
2855 /* Check we have enough spares to not fail */
2856 spares_needed
= max(reshape
.before
.data_disks
,
2857 reshape
.after
.data_disks
)
2859 if ((info
->new_level
> 1 || info
->new_level
== 0) &&
2860 spares_needed
> info
->array
.spare_disks
+added_disks
) {
2861 pr_err("Need %d spare%s to create working array,"
2862 " and only have %d.\n",
2864 spares_needed
== 1 ? "" : "s",
2865 info
->array
.spare_disks
+ added_disks
);
2869 if (reshape
.level
!= array
.level
) {
2870 int err
= impose_level(fd
, reshape
.level
, devname
, verbose
);
2873 info
->new_layout
= UnSet
; /* after level change,
2874 * layout is meaningless */
2875 orig_level
= array
.level
;
2876 sysfs_freeze_array(info
);
2878 if (reshape
.level
> 0 && st
->ss
->external
) {
2879 /* make sure mdmon is aware of the new level */
2880 if (mdmon_running(container
))
2881 flush_mdmon(container
);
2883 if (!mdmon_running(container
))
2884 start_mdmon(container
);
2885 ping_monitor(container
);
2886 if (mdmon_running(container
) &&
2887 st
->update_tail
== NULL
)
2888 st
->update_tail
= &st
->updates
;
2891 /* ->reshape_super might have chosen some spares from the
2892 * container that it wants to be part of the new array.
2893 * We can collect them with ->container_content and give
2894 * them to the kernel.
2896 if (st
->ss
->reshape_super
&& st
->ss
->container_content
) {
2897 char *subarray
= strchr(info
->text_version
+1, '/')+1;
2898 struct mdinfo
*info2
=
2899 st
->ss
->container_content(st
, subarray
);
2903 sysfs_init(info2
, fd
, st
->devnm
);
2904 /* When increasing number of devices, we need to set
2905 * new raid_disks before adding these, or they might
2908 if (reshape
.backup_blocks
&&
2909 reshape
.after
.data_disks
> reshape
.before
.data_disks
)
2910 subarray_set_num(container
, info2
, "raid_disks",
2911 reshape
.after
.data_disks
+
2913 for (d
= info2
->devs
; d
; d
= d
->next
) {
2914 if (d
->disk
.state
== 0 &&
2915 d
->disk
.raid_disk
>= 0) {
2916 /* This is a spare that wants to
2917 * be part of the array.
2919 add_disk(fd
, st
, info2
, d
);
2925 /* We might have been given some devices to add to the
2926 * array. Now that the array has been changed to the right
2927 * level and frozen, we can safely add them.
2930 Manage_subdevs(devname
, fd
, devlist
, verbose
,
2933 if (reshape
.backup_blocks
== 0 && data_offset
!= INVALID_SECTORS
)
2934 reshape
.backup_blocks
= reshape
.before
.data_disks
* info
->array
.chunk_size
/512;
2935 if (reshape
.backup_blocks
== 0) {
2936 /* No restriping needed, but we might need to impose
2937 * some more changes: layout, raid_disks, chunk_size
2939 /* read current array info */
2940 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) != 0) {
2941 dprintf("Cannot get array information.\n");
2944 /* compare current array info with new values and if
2945 * it is different update them to new */
2946 if (info
->new_layout
!= UnSet
&&
2947 info
->new_layout
!= array
.layout
) {
2948 array
.layout
= info
->new_layout
;
2949 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
2950 pr_err("failed to set new layout\n");
2952 } else if (verbose
>= 0)
2953 printf("layout for %s set to %d\n",
2954 devname
, array
.layout
);
2956 if (info
->delta_disks
!= UnSet
&&
2957 info
->delta_disks
!= 0 &&
2958 array
.raid_disks
!= (info
->array
.raid_disks
+ info
->delta_disks
)) {
2959 array
.raid_disks
+= info
->delta_disks
;
2960 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
2961 pr_err("failed to set raid disks\n");
2963 } else if (verbose
>= 0) {
2964 printf("raid_disks for %s set to %d\n",
2965 devname
, array
.raid_disks
);
2968 if (info
->new_chunk
!= 0 &&
2969 info
->new_chunk
!= array
.chunk_size
) {
2970 if (sysfs_set_num(info
, NULL
,
2971 "chunk_size", info
->new_chunk
) != 0) {
2972 pr_err("failed to set chunk size\n");
2974 } else if (verbose
>= 0)
2975 printf("chunk size for %s set to %d\n",
2976 devname
, array
.chunk_size
);
2983 * There are three possibilities.
2984 * 1/ The array will shrink.
2985 * We need to ensure the reshape will pause before reaching
2986 * the 'critical section'. We also need to fork and wait for
2987 * that to happen. When it does we
2988 * suspend/backup/complete/unfreeze
2990 * 2/ The array will not change size.
2991 * This requires that we keep a backup of a sliding window
2992 * so that we can restore data after a crash. So we need
2993 * to fork and monitor progress.
2994 * In future we will allow the data_offset to change, so
2995 * a sliding backup becomes unnecessary.
2997 * 3/ The array will grow. This is relatively easy.
2998 * However the kernel's restripe routines will cheerfully
2999 * overwrite some early data before it is safe. So we
3000 * need to make a backup of the early parts of the array
3001 * and be ready to restore it if rebuild aborts very early.
3002 * For externally managed metadata, we still need a forked
3003 * child to monitor the reshape and suspend IO over the region
3004 * that is being reshaped.
3006 * We backup data by writing it to one spare, or to a
3007 * file which was given on command line.
3009 * In each case, we first make sure that storage is available
3010 * for the required backup.
3012 * - request the shape change.
3013 * - fork to handle backup etc.
3015 /* Check that we can hold all the data */
3016 get_dev_size(fd
, NULL
, &array_size
);
3017 if (reshape
.new_size
< (array_size
/512)) {
3018 pr_err("this change will reduce the size of the array.\n"
3019 " use --grow --array-size first to truncate array.\n"
3020 " e.g. mdadm --grow %s --array-size %llu\n",
3021 devname
, reshape
.new_size
/2);
3025 if (array
.level
== 10) {
3026 /* Reshaping RAID10 does not require any data backup by
3027 * user-space. Instead it requires that the data_offset
3028 * is changed to avoid the need for backup.
3029 * So this is handled very separately
3032 /* Nothing to do. */
3034 return raid10_reshape(container
, fd
, devname
, st
, info
,
3035 &reshape
, data_offset
,
3038 sra
= sysfs_read(fd
, NULL
,
3039 GET_COMPONENT
|GET_DEVS
|GET_OFFSET
|GET_STATE
|GET_CHUNK
|
3042 pr_err("%s: Cannot get array details from sysfs\n",
3048 switch(set_new_data_offset(sra
, st
, devname
,
3049 reshape
.after
.data_disks
- reshape
.before
.data_disks
,
3051 reshape
.min_offset_change
)) {
3055 /* Updated data_offset, so it's easy now */
3056 update_cache_size(container
, sra
, info
,
3057 min(reshape
.before
.data_disks
,
3058 reshape
.after
.data_disks
),
3059 reshape
.backup_blocks
);
3061 /* Right, everything seems fine. Let's kick things off.
3065 if (impose_reshape(sra
, info
, st
, fd
, restart
,
3066 devname
, container
, &reshape
) < 0)
3068 if (sysfs_set_str(sra
, NULL
, "sync_action", "reshape") < 0) {
3069 pr_err("Failed to initiate reshape!\n");
3072 if (info
->new_level
== reshape
.level
)
3074 /* need to adjust level when reshape completes */
3076 case -1: /* ignore error, but don't wait */
3078 default: /* parent */
3085 impose_level(fd
, info
->new_level
, devname
, verbose
);
3088 case 1: /* Couldn't set data_offset, try the old way */
3089 if (data_offset
!= INVALID_SECTORS
) {
3090 pr_err("Cannot update data_offset on this array\n");
3097 /* Decide how many blocks (sectors) for a reshape
3098 * unit. The number we have so far is just a minimum
3100 blocks
= reshape
.backup_blocks
;
3101 if (reshape
.before
.data_disks
==
3102 reshape
.after
.data_disks
) {
3103 /* Make 'blocks' bigger for better throughput, but
3104 * not so big that we reject it below.
3105 * Try for 16 megabytes
3107 while (blocks
* 32 < sra
->component_size
&&
3111 pr_err("Need to backup %luK of critical "
3112 "section..\n", blocks
/2);
3114 if (blocks
>= sra
->component_size
/2) {
3115 pr_err("%s: Something wrong"
3116 " - reshape aborted\n",
3121 /* Now we need to open all these devices so we can read/write.
3123 nrdisks
= max(reshape
.before
.data_disks
,
3124 reshape
.after
.data_disks
) + reshape
.parity
3125 + sra
->array
.spare_disks
;
3126 fdlist
= xcalloc((1+nrdisks
), sizeof(int));
3127 offsets
= xcalloc((1+nrdisks
), sizeof(offsets
[0]));
3129 odisks
= reshape
.before
.data_disks
+ reshape
.parity
;
3130 d
= reshape_prepare_fdlist(devname
, sra
, odisks
,
3131 nrdisks
, blocks
, backup_file
,
3136 if ((st
->ss
->manage_reshape
== NULL
) ||
3137 (st
->ss
->recover_backup
== NULL
)) {
3138 if (backup_file
== NULL
) {
3139 if (reshape
.after
.data_disks
<=
3140 reshape
.before
.data_disks
) {
3141 pr_err("%s: Cannot grow - "
3142 "need backup-file\n", devname
);
3144 } else if (sra
->array
.spare_disks
== 0) {
3145 pr_err("%s: Cannot grow - "
3146 "need a spare or backup-file to backup "
3147 "critical section\n", devname
);
3151 if (!reshape_open_backup_file(backup_file
, fd
, devname
,
3153 fdlist
+d
, offsets
+d
,
3161 update_cache_size(container
, sra
, info
,
3162 min(reshape
.before
.data_disks
, reshape
.after
.data_disks
),
3165 /* Right, everything seems fine. Let's kick things off.
3166 * If only changing raid_disks, use ioctl, else use
3171 if (impose_reshape(sra
, info
, st
, fd
, restart
,
3172 devname
, container
, &reshape
) < 0)
3175 err
= start_reshape(sra
, restart
, reshape
.before
.data_disks
,
3176 reshape
.after
.data_disks
);
3178 pr_err("Cannot %s reshape for %s\n",
3179 restart
? "continue" : "start",
3184 sysfs_set_str(sra
, NULL
, "array_state", "active");
3185 if (freeze_reshape
) {
3189 pr_err("Reshape has to be continued from"
3190 " location %llu when root filesystem has been mounted.\n",
3191 sra
->reshape_progress
);
3195 /* Now we just need to kick off the reshape and watch, while
3196 * handling backups of the data...
3197 * This is all done by a forked background process.
3199 switch(forked
? 0 : fork()) {
3201 pr_err("Cannot run child to monitor reshape: %s\n",
3215 /* If another array on the same devices is busy, the
3216 * reshape will wait for them. This would mean that
3217 * the first section that we suspend will stay suspended
3218 * for a long time. So check on that possibility
3219 * by looking for "DELAYED" in /proc/mdstat, and if found,
3223 struct mdstat_ent
*mds
, *m
;
3225 mds
= mdstat_read(0, 0);
3226 for (m
= mds
; m
; m
= m
->next
)
3227 if (strcmp(m
->devnm
, sra
->sys_name
) == 0) {
3229 m
->percent
== RESYNC_DELAYED
)
3232 /* Haven't started the reshape thread
3239 if (delayed
== 1 && get_linux_version() < 3007000) {
3240 pr_err("Reshape is delayed, but cannot wait carefully with this kernel.\n"
3241 " You might experience problems until other reshapes complete.\n");
3245 sleep(30 - (delayed
-1) * 25);
3249 if (check_env("MDADM_GROW_VERIFY"))
3250 fd
= open(devname
, O_RDONLY
| O_DIRECT
);
3253 mlockall(MCL_FUTURE
);
3255 if (st
->ss
->external
) {
3256 /* metadata handler takes it from here */
3257 done
= st
->ss
->manage_reshape(
3258 fd
, sra
, &reshape
, st
, blocks
,
3260 d
- odisks
, fdlist
+odisks
,
3263 done
= child_monitor(
3264 fd
, sra
, &reshape
, st
, blocks
,
3266 d
- odisks
, fdlist
+odisks
,
3272 if (backup_file
&& done
)
3273 unlink(backup_file
);
3279 if (!st
->ss
->external
&&
3280 !(reshape
.before
.data_disks
!= reshape
.after
.data_disks
3281 && info
->custom_array_size
) &&
3282 info
->new_level
== reshape
.level
&&
3284 /* no need to wait for the reshape to finish as
3285 * there is nothing more to do.
3292 if (st
->ss
->external
) {
3293 /* Re-load the metadata as much could have changed */
3294 int cfd
= open_dev(st
->container_devnm
);
3296 flush_mdmon(container
);
3297 st
->ss
->free_super(st
);
3298 st
->ss
->load_container(st
, cfd
, container
);
3303 /* set new array size if required customer_array_size is used
3306 if (reshape
.before
.data_disks
!=
3307 reshape
.after
.data_disks
&&
3308 info
->custom_array_size
)
3309 set_array_size(st
, info
, info
->text_version
);
3311 if (info
->new_level
!= reshape
.level
) {
3313 fd
= open(devname
, O_RDONLY
);
3314 impose_level(fd
, info
->new_level
, devname
, verbose
);
3316 if (info
->new_level
== 0)
3317 st
->update_tail
= NULL
;
3329 if (orig_level
!= UnSet
&& sra
) {
3330 c
= map_num(pers
, orig_level
);
3331 if (c
&& sysfs_set_str(sra
, NULL
, "level", c
) == 0)
3332 pr_err("aborting level change\n");
3340 /* mdfd handle is passed to be closed in child process (after fork).
3342 int reshape_container(char *container
, char *devname
,
3344 struct supertype
*st
,
3345 struct mdinfo
*info
,
3348 int verbose
, int restart
, int freeze_reshape
)
3350 struct mdinfo
*cc
= NULL
;
3352 char last_devnm
[32] = "";
3354 /* component_size is not meaningful for a container,
3355 * so pass '0' meaning 'no change'
3358 reshape_super(st
, 0, info
->new_level
,
3359 info
->new_layout
, info
->new_chunk
,
3360 info
->array
.raid_disks
, info
->delta_disks
,
3361 backup_file
, devname
, APPLY_METADATA_CHANGES
,
3369 /* ping monitor to be sure that update is on disk
3371 ping_monitor(container
);
3374 case -1: /* error */
3375 perror("Cannot fork to complete reshape\n");
3378 default: /* parent */
3379 if (!freeze_reshape
)
3380 printf(Name
": multi-array reshape continues"
3381 " in background\n");
3388 /* close unused handle in child process
3394 /* For each member array with reshape_active,
3395 * we need to perform the reshape.
3396 * We pick the first array that needs reshaping and
3397 * reshape it. reshape_array() will re-read the metadata
3398 * so the next time through a different array should be
3399 * ready for reshape.
3400 * It is possible that the 'different' array will not
3401 * be assembled yet. In that case we simple exit.
3402 * When it is assembled, the mdadm which assembles it
3403 * will take over the reshape.
3405 struct mdinfo
*content
;
3407 struct mdstat_ent
*mdstat
;
3413 cc
= st
->ss
->container_content(st
, NULL
);
3415 for (content
= cc
; content
; content
= content
->next
) {
3417 if (!content
->reshape_active
)
3420 subarray
= strchr(content
->text_version
+1, '/')+1;
3421 mdstat
= mdstat_by_subdev(subarray
, container
);
3424 if (mdstat
->active
== 0) {
3425 pr_err("Skipping inactive array %s.\n",
3427 free_mdstat(mdstat
);
3436 devid
= devnm2devid(mdstat
->devnm
);
3437 adev
= map_dev(major(devid
), minor(devid
), 0);
3439 adev
= content
->text_version
;
3441 fd
= open_dev(mdstat
->devnm
);
3443 printf(Name
": Device %s cannot be opened for reshape.",
3448 if (strcmp(last_devnm
, mdstat
->devnm
) == 0) {
3449 /* Do not allow for multiple reshape_array() calls for
3451 * It can happen when reshape_array() returns without
3452 * error, when reshape is not finished (wrong reshape
3453 * starting/continuation conditions). Mdmon doesn't
3454 * switch to next array in container and reentry
3455 * conditions for the same array occur.
3456 * This is possibly interim until the behaviour of
3457 * reshape_array is resolved().
3459 printf(Name
": Multiple reshape execution detected for "
3460 "device %s.", adev
);
3464 strcpy(last_devnm
, mdstat
->devnm
);
3466 sysfs_init(content
, fd
, mdstat
->devnm
);
3468 if (mdmon_running(container
))
3469 flush_mdmon(container
);
3471 rv
= reshape_array(container
, fd
, adev
, st
,
3472 content
, force
, NULL
, 0ULL,
3473 backup_file
, verbose
, 1, restart
,
3477 if (freeze_reshape
) {
3486 if (mdmon_running(container
))
3487 flush_mdmon(container
);
3496 * We run a child process in the background which performs the following
3498 * - wait for resync to reach a certain point
3499 * - suspend io to the following section
3500 * - backup that section
3501 * - allow resync to proceed further
3503 * - discard the backup.
3505 * When are combined in slightly different ways in the three cases.
3507 * - suspend/backup/allow/wait/resume/discard
3509 * - allow/wait/suspend/backup/allow/wait/resume/discard
3511 * - wait/resume/discard/suspend/backup/allow
3513 * suspend/backup/allow always come together
3514 * wait/resume/discard do too.
3515 * For the same-size case we have two backups to improve flow.
3519 int progress_reshape(struct mdinfo
*info
, struct reshape
*reshape
,
3520 unsigned long long backup_point
,
3521 unsigned long long wait_point
,
3522 unsigned long long *suspend_point
,
3523 unsigned long long *reshape_completed
)
3525 /* This function is called repeatedly by the reshape manager.
3526 * It determines how much progress can safely be made and allows
3528 * - 'info' identifies the array and particularly records in
3529 * ->reshape_progress the metadata's knowledge of progress
3530 * This is a sector offset from the start of the array
3531 * of the next array block to be relocated. This number
3532 * may increase from 0 or decrease from array_size, depending
3533 * on the type of reshape that is happening.
3534 * Note that in contrast, 'sync_completed' is a block count of the
3535 * reshape so far. It gives the distance between the start point
3536 * (head or tail of device) and the next place that data will be
3537 * written. It always increases.
3538 * - 'reshape' is the structure created by analyse_change
3539 * - 'backup_point' shows how much the metadata manager has backed-up
3540 * data. For reshapes with increasing progress, it is the next address
3541 * to be backed up, previous addresses have been backed-up. For
3542 * decreasing progress, it is the earliest address that has been
3543 * backed up - later address are also backed up.
3544 * So addresses between reshape_progress and backup_point are
3545 * backed up providing those are in the 'correct' order.
3546 * - 'wait_point' is an array address. When reshape_completed
3547 * passes this point, progress_reshape should return. It might
3548 * return earlier if it determines that ->reshape_progress needs
3549 * to be updated or further backup is needed.
3550 * - suspend_point is maintained by progress_reshape and the caller
3551 * should not touch it except to initialise to zero.
3552 * It is an array address and it only increases in 2.6.37 and earlier.
3553 * This makes it difficult to handle reducing reshapes with
3554 * external metadata.
3555 * However: it is similar to backup_point in that it records the
3556 * other end of a suspended region from reshape_progress.
3557 * it is moved to extend the region that is safe to backup and/or
3559 * - reshape_completed is read from sysfs and returned. The caller
3560 * should copy this into ->reshape_progress when it has reason to
3561 * believe that the metadata knows this, and any backup outside this
3565 * 1 if more data from backup_point - but only as far as suspend_point,
3566 * should be backed up
3567 * 0 if things are progressing smoothly
3568 * -1 if the reshape is finished because it is all done,
3569 * -2 if the reshape is finished due to an error.
3572 int advancing
= (reshape
->after
.data_disks
3573 >= reshape
->before
.data_disks
);
3574 unsigned long long need_backup
; /* All data between start of array and
3575 * here will at some point need to
3578 unsigned long long read_offset
, write_offset
;
3579 unsigned long long write_range
;
3580 unsigned long long max_progress
, target
, completed
;
3581 unsigned long long array_size
= (info
->component_size
3582 * reshape
->before
.data_disks
);
3586 /* First, we unsuspend any region that is now known to be safe.
3587 * If suspend_point is on the 'wrong' side of reshape_progress, then
3588 * we don't have or need suspension at the moment. This is true for
3589 * native metadata when we don't need to back-up.
3592 if (info
->reshape_progress
<= *suspend_point
)
3593 sysfs_set_num(info
, NULL
, "suspend_lo",
3594 info
->reshape_progress
);
3596 /* Note: this won't work in 2.6.37 and before.
3597 * Something somewhere should make sure we don't need it!
3599 if (info
->reshape_progress
>= *suspend_point
)
3600 sysfs_set_num(info
, NULL
, "suspend_hi",
3601 info
->reshape_progress
);
3604 /* Now work out how far it is safe to progress.
3605 * If the read_offset for ->reshape_progress is less than
3606 * 'blocks' beyond the write_offset, we can only progress as far
3608 * Otherwise we can progress until the write_offset for the new location
3609 * reaches (within 'blocks' of) the read_offset at the current location.
3610 * However that region must be suspended unless we are using native
3612 * If we need to suspend more, we limit it to 128M per device, which is
3613 * rather arbitrary and should be some time-based calculation.
3615 read_offset
= info
->reshape_progress
/ reshape
->before
.data_disks
;
3616 write_offset
= info
->reshape_progress
/ reshape
->after
.data_disks
;
3617 write_range
= info
->new_chunk
/512;
3618 if (reshape
->before
.data_disks
== reshape
->after
.data_disks
)
3619 need_backup
= array_size
;
3621 need_backup
= reshape
->backup_blocks
;
3623 if (read_offset
< write_offset
+ write_range
)
3624 max_progress
= backup_point
;
3628 reshape
->after
.data_disks
;
3630 if (read_offset
> write_offset
- write_range
)
3631 /* Can only progress as far as has been backed up,
3632 * which must be suspended */
3633 max_progress
= backup_point
;
3634 else if (info
->reshape_progress
<= need_backup
)
3635 max_progress
= backup_point
;
3637 if (info
->array
.major_version
>= 0)
3638 /* Can progress until backup is needed */
3639 max_progress
= need_backup
;
3641 /* Can progress until metadata update is required */
3644 reshape
->after
.data_disks
;
3645 /* but data must be suspended */
3646 if (max_progress
< *suspend_point
)
3647 max_progress
= *suspend_point
;
3652 /* We know it is safe to progress to 'max_progress' providing
3653 * it is suspended or we are using native metadata.
3654 * Consider extending suspend_point 128M per device if it
3655 * is less than 64M per device beyond reshape_progress.
3656 * But always do a multiple of 'blocks'
3657 * FIXME this is too big - it takes to long to complete
3660 target
= 64*1024*2 * min(reshape
->before
.data_disks
,
3661 reshape
->after
.data_disks
);
3662 target
/= reshape
->backup_blocks
;
3665 target
*= reshape
->backup_blocks
;
3667 /* For externally managed metadata we always need to suspend IO to
3668 * the area being reshaped so we regularly push suspend_point forward.
3669 * For native metadata we only need the suspend if we are going to do
3673 if ((need_backup
> info
->reshape_progress
3674 || info
->array
.major_version
< 0) &&
3675 *suspend_point
< info
->reshape_progress
+ target
) {
3676 if (need_backup
< *suspend_point
+ 2 * target
)
3677 *suspend_point
= need_backup
;
3678 else if (*suspend_point
+ 2 * target
< array_size
)
3679 *suspend_point
+= 2 * target
;
3681 *suspend_point
= array_size
;
3682 sysfs_set_num(info
, NULL
, "suspend_hi", *suspend_point
);
3683 if (max_progress
> *suspend_point
)
3684 max_progress
= *suspend_point
;
3687 if (info
->array
.major_version
>= 0) {
3688 /* Only need to suspend when about to backup */
3689 if (info
->reshape_progress
< need_backup
* 2 &&
3690 *suspend_point
> 0) {
3692 sysfs_set_num(info
, NULL
, "suspend_lo", 0);
3693 sysfs_set_num(info
, NULL
, "suspend_hi", need_backup
);
3696 /* Need to suspend continually */
3697 if (info
->reshape_progress
< *suspend_point
)
3698 *suspend_point
= info
->reshape_progress
;
3699 if (*suspend_point
+ target
< info
->reshape_progress
)
3700 /* No need to move suspend region yet */;
3702 if (*suspend_point
>= 2 * target
)
3703 *suspend_point
-= 2 * target
;
3706 sysfs_set_num(info
, NULL
, "suspend_lo",
3709 if (max_progress
< *suspend_point
)
3710 max_progress
= *suspend_point
;
3714 /* now set sync_max to allow that progress. sync_max, like
3715 * sync_completed is a count of sectors written per device, so
3716 * we find the difference between max_progress and the start point,
3717 * and divide that by after.data_disks to get a sync_max
3719 * At the same time we convert wait_point to a similar number
3720 * for comparing against sync_completed.
3722 /* scale down max_progress to per_disk */
3723 max_progress
/= reshape
->after
.data_disks
;
3724 /* Round to chunk size as some kernels give an erroneously high number */
3725 max_progress
/= info
->new_chunk
/512;
3726 max_progress
*= info
->new_chunk
/512;
3727 /* And round to old chunk size as the kernel wants that */
3728 max_progress
/= info
->array
.chunk_size
/512;
3729 max_progress
*= info
->array
.chunk_size
/512;
3730 /* Limit progress to the whole device */
3731 if (max_progress
> info
->component_size
)
3732 max_progress
= info
->component_size
;
3733 wait_point
/= reshape
->after
.data_disks
;
3735 /* switch from 'device offset' to 'processed block count' */
3736 max_progress
= info
->component_size
- max_progress
;
3737 wait_point
= info
->component_size
- wait_point
;
3740 sysfs_set_num(info
, NULL
, "sync_max", max_progress
);
3742 /* Now wait. If we have already reached the point that we were
3743 * asked to wait to, don't wait at all, else wait for any change.
3744 * We need to select on 'sync_completed' as that is the place that
3745 * notifications happen, but we are really interested in
3746 * 'reshape_position'
3748 fd
= sysfs_get_fd(info
, NULL
, "sync_completed");
3750 goto check_progress
;
3752 if (sysfs_fd_get_ll(fd
, &completed
) < 0)
3753 goto check_progress
;
3755 while (completed
< max_progress
&& completed
< wait_point
) {
3756 /* Check that sync_action is still 'reshape' to avoid
3757 * waiting forever on a dead array
3761 if (sysfs_get_str(info
, NULL
, "sync_action",
3763 strncmp(action
, "reshape", 7) != 0)
3765 /* Some kernels reset 'sync_completed' to zero
3766 * before setting 'sync_action' to 'idle'.
3767 * So we need these extra tests.
3769 if (completed
== 0 && advancing
3770 && info
->reshape_progress
> 0)
3772 if (completed
== 0 && !advancing
3773 && info
->reshape_progress
< (info
->component_size
3774 * reshape
->after
.data_disks
))
3778 select(fd
+1, NULL
, NULL
, &rfds
, NULL
);
3779 if (sysfs_fd_get_ll(fd
, &completed
) < 0)
3780 goto check_progress
;
3782 /* Some kernels reset 'sync_completed' to zero,
3783 * we need to have real point we are in md
3786 completed
= max_progress
;
3788 /* some kernels can give an incorrectly high 'completed' number */
3789 completed
/= (info
->new_chunk
/512);
3790 completed
*= (info
->new_chunk
/512);
3791 /* Convert 'completed' back in to a 'progress' number */
3792 completed
*= reshape
->after
.data_disks
;
3794 completed
= info
->component_size
* reshape
->after
.data_disks
3797 *reshape_completed
= completed
;
3801 /* We return the need_backup flag. Caller will decide
3802 * how much - a multiple of ->backup_blocks up to *suspend_point
3805 return need_backup
> info
->reshape_progress
;
3807 return need_backup
>= info
->reshape_progress
;
3810 /* if we couldn't read a number from sync_completed, then
3811 * either the reshape did complete, or it aborted.
3812 * We can tell which by checking for 'none' in reshape_position.
3813 * If it did abort, then it might immediately restart if it
3814 * it was just a device failure that leaves us degraded but
3818 if (sysfs_get_str(info
, NULL
, "reshape_position", buf
, sizeof(buf
)) < 0
3819 || strncmp(buf
, "none", 4) != 0) {
3820 /* The abort might only be temporary. Wait up to 10
3821 * seconds for fd to contain a valid number again.
3827 while (fd
>= 0 && rv
< 0 && tv
.tv_sec
> 0) {
3831 if (select(fd
+1, NULL
, NULL
, &rfds
, &tv
) != 1)
3833 switch (sysfs_fd_get_ll(fd
, &completed
)) {
3835 /* all good again */
3838 case -2: /* read error - abort */
3845 return rv
; /* abort */
3847 /* Maybe racing with array shutdown - check state */
3850 if (sysfs_get_str(info
, NULL
, "array_state", buf
, sizeof(buf
)) < 0
3851 || strncmp(buf
, "inactive", 8) == 0
3852 || strncmp(buf
, "clear",5) == 0)
3853 return -2; /* abort */
3854 return -1; /* complete */
3858 /* FIXME return status is never checked */
3859 static int grow_backup(struct mdinfo
*sra
,
3860 unsigned long long offset
, /* per device */
3861 unsigned long stripes
, /* per device, in old chunks */
3862 int *sources
, unsigned long long *offsets
,
3863 int disks
, int chunk
, int level
, int layout
,
3864 int dests
, int *destfd
, unsigned long long *destoffsets
,
3865 int part
, int *degraded
,
3868 /* Backup 'blocks' sectors at 'offset' on each device of the array,
3869 * to storage 'destfd' (offset 'destoffsets'), after first
3870 * suspending IO. Then allow resync to continue
3871 * over the suspended section.
3872 * Use part 'part' of the backup-super-block.
3877 unsigned long long ll
;
3879 //printf("offset %llu\n", offset);
3885 /* Check that array hasn't become degraded, else we might backup the wrong data */
3886 if (sysfs_get_ll(sra
, NULL
, "degraded", &ll
) < 0)
3887 return -1; /* FIXME this error is ignored */
3888 new_degraded
= (int)ll
;
3889 if (new_degraded
!= *degraded
) {
3890 /* check each device to ensure it is still working */
3892 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
3893 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
3895 if (sd
->disk
.state
& (1<<MD_DISK_SYNC
)) {
3897 if (sysfs_get_str(sra
, sd
, "state", sbuf
, 20) < 0 ||
3898 strstr(sbuf
, "faulty") ||
3899 strstr(sbuf
, "in_sync") == NULL
) {
3900 /* this device is dead */
3901 sd
->disk
.state
= (1<<MD_DISK_FAULTY
);
3902 if (sd
->disk
.raid_disk
>= 0 &&
3903 sources
[sd
->disk
.raid_disk
] >= 0) {
3904 close(sources
[sd
->disk
.raid_disk
]);
3905 sources
[sd
->disk
.raid_disk
] = -1;
3910 *degraded
= new_degraded
;
3913 bsb
.arraystart2
= __cpu_to_le64(offset
* odata
);
3914 bsb
.length2
= __cpu_to_le64(stripes
* (chunk
/512) * odata
);
3916 bsb
.arraystart
= __cpu_to_le64(offset
* odata
);
3917 bsb
.length
= __cpu_to_le64(stripes
* (chunk
/512) * odata
);
3920 bsb
.magic
[15] = '2';
3921 for (i
= 0; i
< dests
; i
++)
3923 lseek64(destfd
[i
], destoffsets
[i
] + __le64_to_cpu(bsb
.devstart2
)*512, 0);
3925 lseek64(destfd
[i
], destoffsets
[i
], 0);
3927 rv
= save_stripes(sources
, offsets
,
3928 disks
, chunk
, level
, layout
,
3930 offset
*512*odata
, stripes
* chunk
* odata
,
3935 bsb
.mtime
= __cpu_to_le64(time(0));
3936 for (i
= 0; i
< dests
; i
++) {
3937 bsb
.devstart
= __cpu_to_le64(destoffsets
[i
]/512);
3939 bsb
.sb_csum
= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
));
3940 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0)
3941 bsb
.sb_csum2
= bsb_csum((char*)&bsb
,
3942 ((char*)&bsb
.sb_csum2
)-((char*)&bsb
));
3945 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
] - 4096, 0)
3946 != destoffsets
[i
] - 4096)
3948 if (write(destfd
[i
], &bsb
, 512) != 512)
3950 if (destoffsets
[i
] > 4096) {
3951 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
]+stripes
*chunk
*odata
, 0) !=
3952 destoffsets
[i
]+stripes
*chunk
*odata
)
3954 if (write(destfd
[i
], &bsb
, 512) != 512)
3964 /* in 2.6.30, the value reported by sync_completed can be
3965 * less that it should be by one stripe.
3966 * This only happens when reshape hits sync_max and pauses.
3967 * So allow wait_backup to either extent sync_max further
3968 * than strictly necessary, or return before the
3969 * sync has got quite as far as we would really like.
3970 * This is what 'blocks2' is for.
3971 * The various caller give appropriate values so that
3974 /* FIXME return value is often ignored */
3975 static int forget_backup(int dests
, int *destfd
,
3976 unsigned long long *destoffsets
,
3980 * Erase backup 'part' (which is 0 or 1)
3986 bsb
.arraystart2
= __cpu_to_le64(0);
3987 bsb
.length2
= __cpu_to_le64(0);
3989 bsb
.arraystart
= __cpu_to_le64(0);
3990 bsb
.length
= __cpu_to_le64(0);
3992 bsb
.mtime
= __cpu_to_le64(time(0));
3994 for (i
= 0; i
< dests
; i
++) {
3995 bsb
.devstart
= __cpu_to_le64(destoffsets
[i
]/512);
3996 bsb
.sb_csum
= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
));
3997 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0)
3998 bsb
.sb_csum2
= bsb_csum((char*)&bsb
,
3999 ((char*)&bsb
.sb_csum2
)-((char*)&bsb
));
4000 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
]-4096, 0) !=
4001 destoffsets
[i
]-4096)
4004 write(destfd
[i
], &bsb
, 512) != 512)
4011 static void fail(char *msg
)
4014 rv
= (write(2, msg
, strlen(msg
)) != (int)strlen(msg
));
4015 rv
|= (write(2, "\n", 1) != 1);
4019 static char *abuf
, *bbuf
;
4020 static unsigned long long abuflen
;
4021 static void validate(int afd
, int bfd
, unsigned long long offset
)
4023 /* check that the data in the backup against the array.
4024 * This is only used for regression testing and should not
4025 * be used while the array is active
4029 lseek64(bfd
, offset
- 4096, 0);
4030 if (read(bfd
, &bsb2
, 512) != 512)
4031 fail("cannot read bsb");
4032 if (bsb2
.sb_csum
!= bsb_csum((char*)&bsb2
,
4033 ((char*)&bsb2
.sb_csum
)-((char*)&bsb2
)))
4034 fail("first csum bad");
4035 if (memcmp(bsb2
.magic
, "md_backup_data", 14) != 0)
4036 fail("magic is bad");
4037 if (memcmp(bsb2
.magic
, "md_backup_data-2", 16) == 0 &&
4038 bsb2
.sb_csum2
!= bsb_csum((char*)&bsb2
,
4039 ((char*)&bsb2
.sb_csum2
)-((char*)&bsb2
)))
4040 fail("second csum bad");
4042 if (__le64_to_cpu(bsb2
.devstart
)*512 != offset
)
4043 fail("devstart is wrong");
4046 unsigned long long len
= __le64_to_cpu(bsb2
.length
)*512;
4048 if (abuflen
< len
) {
4052 if (posix_memalign((void**)&abuf
, 4096, abuflen
) ||
4053 posix_memalign((void**)&bbuf
, 4096, abuflen
)) {
4055 /* just stop validating on mem-alloc failure */
4060 lseek64(bfd
, offset
, 0);
4061 if ((unsigned long long)read(bfd
, bbuf
, len
) != len
) {
4062 //printf("len %llu\n", len);
4063 fail("read first backup failed");
4065 lseek64(afd
, __le64_to_cpu(bsb2
.arraystart
)*512, 0);
4066 if ((unsigned long long)read(afd
, abuf
, len
) != len
)
4067 fail("read first from array failed");
4068 if (memcmp(bbuf
, abuf
, len
) != 0) {
4071 printf("offset=%llu len=%llu\n",
4072 (unsigned long long)__le64_to_cpu(bsb2
.arraystart
)*512, len
);
4073 for (i
=0; i
<len
; i
++)
4074 if (bbuf
[i
] != abuf
[i
]) {
4075 printf("first diff byte %d\n", i
);
4079 fail("data1 compare failed");
4083 unsigned long long len
= __le64_to_cpu(bsb2
.length2
)*512;
4085 if (abuflen
< len
) {
4089 abuf
= xmalloc(abuflen
);
4090 bbuf
= xmalloc(abuflen
);
4093 lseek64(bfd
, offset
+__le64_to_cpu(bsb2
.devstart2
)*512, 0);
4094 if ((unsigned long long)read(bfd
, bbuf
, len
) != len
)
4095 fail("read second backup failed");
4096 lseek64(afd
, __le64_to_cpu(bsb2
.arraystart2
)*512, 0);
4097 if ((unsigned long long)read(afd
, abuf
, len
) != len
)
4098 fail("read second from array failed");
4099 if (memcmp(bbuf
, abuf
, len
) != 0)
4100 fail("data2 compare failed");
4104 int child_monitor(int afd
, struct mdinfo
*sra
, struct reshape
*reshape
,
4105 struct supertype
*st
, unsigned long blocks
,
4106 int *fds
, unsigned long long *offsets
,
4107 int dests
, int *destfd
, unsigned long long *destoffsets
)
4109 /* Monitor a reshape where backup is being performed using
4110 * 'native' mechanism - either to a backup file, or
4111 * to some space in a spare.
4115 unsigned long long speed
;
4116 unsigned long long suspend_point
, array_size
;
4117 unsigned long long backup_point
, wait_point
;
4118 unsigned long long reshape_completed
;
4120 int increasing
= reshape
->after
.data_disks
>= reshape
->before
.data_disks
;
4121 int part
= 0; /* The next part of the backup area to fill. It may already
4122 * be full, so we need to check */
4123 int level
= reshape
->level
;
4124 int layout
= reshape
->before
.layout
;
4125 int data
= reshape
->before
.data_disks
;
4126 int disks
= reshape
->before
.data_disks
+ reshape
->parity
;
4127 int chunk
= sra
->array
.chunk_size
;
4129 unsigned long stripes
;
4132 /* set up the backup-super-block. This requires the
4133 * uuid from the array.
4135 /* Find a superblock */
4136 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
4140 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
4142 dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 1);
4143 devfd
= dev_open(dn
, O_RDONLY
);
4146 ok
= st
->ss
->load_super(st
, devfd
, NULL
);
4152 pr_err("Cannot find a superblock\n");
4156 memset(&bsb
, 0, 512);
4157 memcpy(bsb
.magic
, "md_backup_data-1", 16);
4158 st
->ss
->uuid_from_super(st
, uuid
);
4159 memcpy(bsb
.set_uuid
, uuid
, 16);
4160 bsb
.mtime
= __cpu_to_le64(time(0));
4161 bsb
.devstart2
= blocks
;
4163 stripes
= blocks
/ (sra
->array
.chunk_size
/512) /
4164 reshape
->before
.data_disks
;
4166 if (posix_memalign((void**)&buf
, 4096, disks
* chunk
))
4167 /* Don't start the 'reshape' */
4169 if (reshape
->before
.data_disks
== reshape
->after
.data_disks
) {
4170 sysfs_get_ll(sra
, NULL
, "sync_speed_min", &speed
);
4171 sysfs_set_num(sra
, NULL
, "sync_speed_min", 200000);
4175 array_size
= sra
->component_size
* reshape
->after
.data_disks
;
4176 backup_point
= sra
->reshape_progress
;
4179 array_size
= sra
->component_size
* reshape
->before
.data_disks
;
4180 backup_point
= reshape
->backup_blocks
;
4181 suspend_point
= array_size
;
4187 /* Want to return as soon the oldest backup slot can
4188 * be released as that allows us to start backing up
4189 * some more, providing suspend_point has been
4190 * advanced, which it should have.
4193 wait_point
= array_size
;
4194 if (part
== 0 && __le64_to_cpu(bsb
.length
) > 0)
4195 wait_point
= (__le64_to_cpu(bsb
.arraystart
) +
4196 __le64_to_cpu(bsb
.length
));
4197 if (part
== 1 && __le64_to_cpu(bsb
.length2
) > 0)
4198 wait_point
= (__le64_to_cpu(bsb
.arraystart2
) +
4199 __le64_to_cpu(bsb
.length2
));
4202 if (part
== 0 && __le64_to_cpu(bsb
.length
) > 0)
4203 wait_point
= __le64_to_cpu(bsb
.arraystart
);
4204 if (part
== 1 && __le64_to_cpu(bsb
.length2
) > 0)
4205 wait_point
= __le64_to_cpu(bsb
.arraystart2
);
4208 rv
= progress_reshape(sra
, reshape
,
4209 backup_point
, wait_point
,
4210 &suspend_point
, &reshape_completed
);
4211 /* external metadata would need to ping_monitor here */
4212 sra
->reshape_progress
= reshape_completed
;
4214 /* Clear any backup region that is before 'here' */
4216 if (__le64_to_cpu(bsb
.length
) > 0 &&
4217 reshape_completed
>= (__le64_to_cpu(bsb
.arraystart
) +
4218 __le64_to_cpu(bsb
.length
)))
4219 forget_backup(dests
, destfd
,
4221 if (__le64_to_cpu(bsb
.length2
) > 0 &&
4222 reshape_completed
>= (__le64_to_cpu(bsb
.arraystart2
) +
4223 __le64_to_cpu(bsb
.length2
)))
4224 forget_backup(dests
, destfd
,
4227 if (__le64_to_cpu(bsb
.length
) > 0 &&
4228 reshape_completed
<= (__le64_to_cpu(bsb
.arraystart
)))
4229 forget_backup(dests
, destfd
,
4231 if (__le64_to_cpu(bsb
.length2
) > 0 &&
4232 reshape_completed
<= (__le64_to_cpu(bsb
.arraystart2
)))
4233 forget_backup(dests
, destfd
,
4242 if (rv
== 0 && increasing
&& !st
->ss
->external
) {
4243 /* No longer need to monitor this reshape */
4249 unsigned long long offset
;
4250 unsigned long actual_stripes
;
4251 /* Need to backup some data.
4252 * If 'part' is not used and the desired
4253 * backup size is suspended, do a backup,
4254 * then consider the next part.
4256 /* Check that 'part' is unused */
4257 if (part
== 0 && __le64_to_cpu(bsb
.length
) != 0)
4259 if (part
== 1 && __le64_to_cpu(bsb
.length2
) != 0)
4262 offset
= backup_point
/ data
;
4263 actual_stripes
= stripes
;
4265 if (offset
+ actual_stripes
* (chunk
/512) >
4266 sra
->component_size
)
4267 actual_stripes
= ((sra
->component_size
- offset
)
4269 if (offset
+ actual_stripes
* (chunk
/512) >
4273 if (offset
< actual_stripes
* (chunk
/512))
4274 actual_stripes
= offset
/ (chunk
/512);
4275 offset
-= actual_stripes
* (chunk
/512);
4276 if (offset
< suspend_point
/data
)
4279 if (actual_stripes
== 0)
4281 grow_backup(sra
, offset
, actual_stripes
,
4283 disks
, chunk
, level
, layout
,
4284 dests
, destfd
, destoffsets
,
4285 part
, °raded
, buf
);
4286 validate(afd
, destfd
[0], destoffsets
[0]);
4287 /* record where 'part' is up to */
4290 backup_point
+= actual_stripes
* (chunk
/512) * data
;
4292 backup_point
-= actual_stripes
* (chunk
/512) * data
;
4296 /* FIXME maybe call progress_reshape one more time instead */
4297 abort_reshape(sra
); /* remove any remaining suspension */
4298 if (reshape
->before
.data_disks
== reshape
->after
.data_disks
)
4299 sysfs_set_num(sra
, NULL
, "sync_speed_min", speed
);
4305 * If any spare contains md_back_data-1 which is recent wrt mtime,
4306 * write that data into the array and update the super blocks with
4307 * the new reshape_progress
4309 int Grow_restart(struct supertype
*st
, struct mdinfo
*info
, int *fdlist
, int cnt
,
4310 char *backup_file
, int verbose
)
4314 unsigned long long *offsets
;
4315 unsigned long long nstripe
, ostripe
;
4318 odata
= info
->array
.raid_disks
- info
->delta_disks
- 1;
4319 if (info
->array
.level
== 6) odata
--; /* number of data disks */
4320 ndata
= info
->array
.raid_disks
- 1;
4321 if (info
->new_level
== 6) ndata
--;
4323 old_disks
= info
->array
.raid_disks
- info
->delta_disks
;
4325 if (info
->delta_disks
<= 0)
4326 /* Didn't grow, so the backup file must have
4330 for (i
=old_disks
-(backup_file
?1:0); i
<cnt
; i
++) {
4331 struct mdinfo dinfo
;
4334 char *devname
, namebuf
[20];
4335 unsigned long long lo
, hi
;
4337 /* This was a spare and may have some saved data on it.
4338 * Load the superblock, find and load the
4339 * backup_super_block.
4340 * If either fail, go on to next device.
4341 * If the backup contains no new info, just return
4342 * else restore data and update all superblocks
4344 if (i
== old_disks
-1) {
4345 fd
= open(backup_file
, O_RDONLY
);
4347 pr_err("backup file %s inaccessible: %s\n",
4348 backup_file
, strerror(errno
));
4351 devname
= backup_file
;
4356 if (st
->ss
->load_super(st
, fd
, NULL
))
4359 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
4360 st
->ss
->free_super(st
);
4363 (dinfo
.data_offset
+ dinfo
.component_size
- 8) <<9,
4365 pr_err("Cannot seek on device %d\n", i
);
4366 continue; /* Cannot seek */
4368 sprintf(namebuf
, "device-%d", i
);
4371 if (read(fd
, &bsb
, sizeof(bsb
)) != sizeof(bsb
)) {
4373 pr_err("Cannot read from %s\n", devname
);
4374 continue; /* Cannot read */
4376 if (memcmp(bsb
.magic
, "md_backup_data-1", 16) != 0 &&
4377 memcmp(bsb
.magic
, "md_backup_data-2", 16) != 0) {
4379 pr_err("No backup metadata on %s\n", devname
);
4382 if (bsb
.sb_csum
!= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
))) {
4384 pr_err("Bad backup-metadata checksum on %s\n", devname
);
4385 continue; /* bad checksum */
4387 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0 &&
4388 bsb
.sb_csum2
!= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum2
)-((char*)&bsb
))) {
4390 pr_err("Bad backup-metadata checksum2 on %s\n", devname
);
4391 continue; /* Bad second checksum */
4393 if (memcmp(bsb
.set_uuid
,info
->uuid
, 16) != 0) {
4395 pr_err("Wrong uuid on backup-metadata on %s\n", devname
);
4396 continue; /* Wrong uuid */
4399 /* array utime and backup-mtime should be updated at much the same time, but it seems that
4400 * sometimes they aren't... So allow considerable flexability in matching, and allow
4401 * this test to be overridden by an environment variable.
4403 if (info
->array
.utime
> (int)__le64_to_cpu(bsb
.mtime
) + 2*60*60 ||
4404 info
->array
.utime
< (int)__le64_to_cpu(bsb
.mtime
) - 10*60) {
4405 if (check_env("MDADM_GROW_ALLOW_OLD")) {
4406 pr_err("accepting backup with timestamp %lu "
4407 "for array with timestamp %lu\n",
4408 (unsigned long)__le64_to_cpu(bsb
.mtime
),
4409 (unsigned long)info
->array
.utime
);
4411 pr_err("too-old timestamp on backup-metadata on %s\n", devname
);
4412 pr_err("If you think it is should be safe, try 'export MDADM_GROW_ALLOW_OLD=1'\n");
4413 continue; /* time stamp is too bad */
4417 if (bsb
.magic
[15] == '1') {
4418 if (bsb
.length
== 0)
4420 if (info
->delta_disks
>= 0) {
4421 /* reshape_progress is increasing */
4422 if (__le64_to_cpu(bsb
.arraystart
)
4423 + __le64_to_cpu(bsb
.length
)
4424 < info
->reshape_progress
) {
4427 pr_err("backup-metadata found on %s but is not needed\n", devname
);
4428 continue; /* No new data here */
4431 /* reshape_progress is decreasing */
4432 if (__le64_to_cpu(bsb
.arraystart
) >=
4433 info
->reshape_progress
)
4434 goto nonew
; /* No new data here */
4437 if (bsb
.length
== 0 && bsb
.length2
== 0)
4439 if (info
->delta_disks
>= 0) {
4440 /* reshape_progress is increasing */
4441 if ((__le64_to_cpu(bsb
.arraystart
)
4442 + __le64_to_cpu(bsb
.length
)
4443 < info
->reshape_progress
)
4445 (__le64_to_cpu(bsb
.arraystart2
)
4446 + __le64_to_cpu(bsb
.length2
)
4447 < info
->reshape_progress
))
4448 goto nonew
; /* No new data here */
4450 /* reshape_progress is decreasing */
4451 if (__le64_to_cpu(bsb
.arraystart
) >=
4452 info
->reshape_progress
&&
4453 __le64_to_cpu(bsb
.arraystart2
) >=
4454 info
->reshape_progress
)
4455 goto nonew
; /* No new data here */
4458 if (lseek64(fd
, __le64_to_cpu(bsb
.devstart
)*512, 0)< 0) {
4461 pr_err("Failed to verify secondary backup-metadata block on %s\n",
4463 continue; /* Cannot seek */
4465 /* There should be a duplicate backup superblock 4k before here */
4466 if (lseek64(fd
, -4096, 1) < 0 ||
4467 read(fd
, &bsb2
, sizeof(bsb2
)) != sizeof(bsb2
))
4468 goto second_fail
; /* Cannot find leading superblock */
4469 if (bsb
.magic
[15] == '1')
4470 bsbsize
= offsetof(struct mdp_backup_super
, pad1
);
4472 bsbsize
= offsetof(struct mdp_backup_super
, pad
);
4473 if (memcmp(&bsb2
, &bsb
, bsbsize
) != 0)
4474 goto second_fail
; /* Cannot find leading superblock */
4476 /* Now need the data offsets for all devices. */
4477 offsets
= xmalloc(sizeof(*offsets
)*info
->array
.raid_disks
);
4478 for(j
=0; j
<info
->array
.raid_disks
; j
++) {
4481 if (st
->ss
->load_super(st
, fdlist
[j
], NULL
))
4482 /* FIXME should be this be an error */
4484 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
4485 st
->ss
->free_super(st
);
4486 offsets
[j
] = dinfo
.data_offset
* 512;
4488 printf(Name
": restoring critical section\n");
4490 if (restore_stripes(fdlist
, offsets
,
4491 info
->array
.raid_disks
,
4495 fd
, __le64_to_cpu(bsb
.devstart
)*512,
4496 __le64_to_cpu(bsb
.arraystart
)*512,
4497 __le64_to_cpu(bsb
.length
)*512, NULL
)) {
4498 /* didn't succeed, so giveup */
4500 pr_err("Error restoring backup from %s\n",
4506 if (bsb
.magic
[15] == '2' &&
4507 restore_stripes(fdlist
, offsets
,
4508 info
->array
.raid_disks
,
4512 fd
, __le64_to_cpu(bsb
.devstart
)*512 +
4513 __le64_to_cpu(bsb
.devstart2
)*512,
4514 __le64_to_cpu(bsb
.arraystart2
)*512,
4515 __le64_to_cpu(bsb
.length2
)*512, NULL
)) {
4516 /* didn't succeed, so giveup */
4518 pr_err("Error restoring second backup from %s\n",
4526 /* Ok, so the data is restored. Let's update those superblocks. */
4530 lo
= __le64_to_cpu(bsb
.arraystart
);
4531 hi
= lo
+ __le64_to_cpu(bsb
.length
);
4533 if (bsb
.magic
[15] == '2' && bsb
.length2
) {
4534 unsigned long long lo1
, hi1
;
4535 lo1
= __le64_to_cpu(bsb
.arraystart2
);
4536 hi1
= lo1
+ __le64_to_cpu(bsb
.length2
);
4540 } else if (lo
< lo1
)
4546 (info
->reshape_progress
< lo
||
4547 info
->reshape_progress
> hi
))
4548 /* backup does not affect reshape_progress*/ ;
4549 else if (info
->delta_disks
>= 0) {
4550 info
->reshape_progress
= __le64_to_cpu(bsb
.arraystart
) +
4551 __le64_to_cpu(bsb
.length
);
4552 if (bsb
.magic
[15] == '2') {
4553 unsigned long long p2
= __le64_to_cpu(bsb
.arraystart2
) +
4554 __le64_to_cpu(bsb
.length2
);
4555 if (p2
> info
->reshape_progress
)
4556 info
->reshape_progress
= p2
;
4559 info
->reshape_progress
= __le64_to_cpu(bsb
.arraystart
);
4560 if (bsb
.magic
[15] == '2') {
4561 unsigned long long p2
= __le64_to_cpu(bsb
.arraystart2
);
4562 if (p2
< info
->reshape_progress
)
4563 info
->reshape_progress
= p2
;
4566 for (j
=0; j
<info
->array
.raid_disks
; j
++) {
4569 if (st
->ss
->load_super(st
, fdlist
[j
], NULL
))
4571 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
4572 dinfo
.reshape_progress
= info
->reshape_progress
;
4573 st
->ss
->update_super(st
, &dinfo
,
4574 "_reshape_progress",
4576 st
->ss
->store_super(st
, fdlist
[j
]);
4577 st
->ss
->free_super(st
);
4581 /* Didn't find any backup data, try to see if any
4584 if (info
->delta_disks
< 0) {
4585 /* When shrinking, the critical section is at the end.
4586 * So see if we are before the critical section.
4588 unsigned long long first_block
;
4589 nstripe
= ostripe
= 0;
4591 while (ostripe
>= nstripe
) {
4592 ostripe
+= info
->array
.chunk_size
/ 512;
4593 first_block
= ostripe
* odata
;
4594 nstripe
= first_block
/ ndata
/ (info
->new_chunk
/512) *
4595 (info
->new_chunk
/512);
4598 if (info
->reshape_progress
>= first_block
)
4601 if (info
->delta_disks
> 0) {
4602 /* See if we are beyond the critical section. */
4603 unsigned long long last_block
;
4604 nstripe
= ostripe
= 0;
4606 while (nstripe
>= ostripe
) {
4607 nstripe
+= info
->new_chunk
/ 512;
4608 last_block
= nstripe
* ndata
;
4609 ostripe
= last_block
/ odata
/ (info
->array
.chunk_size
/512) *
4610 (info
->array
.chunk_size
/512);
4613 if (info
->reshape_progress
>= last_block
)
4616 /* needed to recover critical section! */
4618 pr_err("Failed to find backup of critical section\n");
4622 int Grow_continue_command(char *devname
, int fd
,
4623 char *backup_file
, int verbose
)
4626 struct supertype
*st
= NULL
;
4627 struct mdinfo
*content
= NULL
;
4628 struct mdinfo array
;
4629 char *subarray
= NULL
;
4630 struct mdinfo
*cc
= NULL
;
4631 struct mdstat_ent
*mdstat
= NULL
;
4635 dprintf("Grow continue from command line called for %s\n",
4638 st
= super_by_fd(fd
, &subarray
);
4639 if (!st
|| !st
->ss
) {
4640 pr_err("Unable to determine metadata format for %s\n",
4644 dprintf("Grow continue is run for ");
4645 if (st
->ss
->external
== 0) {
4647 dprintf("native array (%s)\n", devname
);
4648 if (ioctl(fd
, GET_ARRAY_INFO
, &array
.array
) < 0) {
4649 pr_err("%s is not an active md array -"
4650 " aborting\n", devname
);
4652 goto Grow_continue_command_exit
;
4655 /* Need to load a superblock.
4656 * FIXME we should really get what we need from
4659 for (d
= 0; d
< MAX_DISKS
; d
++) {
4660 mdu_disk_info_t disk
;
4664 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
4666 if (disk
.major
== 0 && disk
.minor
== 0)
4668 if ((disk
.state
& (1 << MD_DISK_ACTIVE
)) == 0)
4670 dv
= map_dev(disk
.major
, disk
.minor
, 1);
4673 fd2
= dev_open(dv
, O_RDONLY
);
4676 err
= st
->ss
->load_super(st
, fd2
, NULL
);
4682 if (d
== MAX_DISKS
) {
4683 pr_err("Unable to load metadata for %s\n",
4686 goto Grow_continue_command_exit
;
4688 st
->ss
->getinfo_super(st
, content
, NULL
);
4693 dprintf("subarray (%s)\n", subarray
);
4694 container
= st
->container_devnm
;
4695 cfd
= open_dev_excl(st
->container_devnm
);
4697 container
= st
->devnm
;
4699 cfd
= open_dev_excl(st
->devnm
);
4700 dprintf("container (%s)\n", container
);
4704 pr_err("Unable to open container "
4705 "for %s\n", devname
);
4707 goto Grow_continue_command_exit
;
4710 /* find in container array under reshape
4712 ret_val
= st
->ss
->load_container(st
, cfd
, NULL
);
4714 pr_err("Cannot read superblock for %s\n",
4717 goto Grow_continue_command_exit
;
4720 cc
= st
->ss
->container_content(st
, subarray
);
4721 for (content
= cc
; content
; content
= content
->next
) {
4723 int allow_reshape
= 1;
4725 if (content
->reshape_active
== 0)
4727 /* The decision about array or container wide
4728 * reshape is taken in Grow_continue based
4729 * content->reshape_active state, therefore we
4730 * need to check_reshape based on
4731 * reshape_active and subarray name
4733 if (content
->array
.state
& (1<<MD_SB_BLOCK_VOLUME
))
4735 if (content
->reshape_active
== CONTAINER_RESHAPE
&&
4736 (content
->array
.state
4737 & (1<<MD_SB_BLOCK_CONTAINER_RESHAPE
)))
4740 if (!allow_reshape
) {
4741 pr_err("cannot continue reshape of an array"
4742 " in container with unsupported"
4743 " metadata: %s(%s)\n",
4744 devname
, container
);
4746 goto Grow_continue_command_exit
;
4749 array
= strchr(content
->text_version
+1, '/')+1;
4750 mdstat
= mdstat_by_subdev(array
, container
);
4753 if (mdstat
->active
== 0) {
4754 pr_err("Skipping inactive array %s.\n",
4756 free_mdstat(mdstat
);
4763 pr_err("Unable to determine reshaped "
4764 "array for %s\n", devname
);
4766 goto Grow_continue_command_exit
;
4768 fd2
= open_dev(mdstat
->devnm
);
4770 pr_err("cannot open (%s)\n", mdstat
->devnm
);
4772 goto Grow_continue_command_exit
;
4775 sysfs_init(content
, fd2
, mdstat
->devnm
);
4777 /* start mdmon in case it is not running
4779 if (!mdmon_running(container
))
4780 start_mdmon(container
);
4781 ping_monitor(container
);
4783 if (mdmon_running(container
))
4784 st
->update_tail
= &st
->updates
;
4786 pr_err("No mdmon found. "
4787 "Grow cannot continue.\n");
4789 goto Grow_continue_command_exit
;
4793 /* verify that array under reshape is started from
4796 if (verify_reshape_position(content
, content
->array
.level
) < 0) {
4798 goto Grow_continue_command_exit
;
4803 ret_val
= Grow_continue(fd
, st
, content
, backup_file
, 0);
4805 Grow_continue_command_exit
:
4810 st
->ss
->free_super(st
);
4811 free_mdstat(mdstat
);
4818 int Grow_continue(int mdfd
, struct supertype
*st
, struct mdinfo
*info
,
4819 char *backup_file
, int freeze_reshape
)
4823 if (!info
->reshape_active
)
4826 if (st
->ss
->external
) {
4827 int cfd
= open_dev(st
->container_devnm
);
4832 st
->ss
->load_container(st
, cfd
, st
->container_devnm
);
4834 ret_val
= reshape_container(st
->container_devnm
, NULL
, mdfd
,
4835 st
, info
, 0, backup_file
,
4837 1 | info
->reshape_active
,
4840 ret_val
= reshape_array(NULL
, mdfd
, "array", st
, info
, 1,
4841 NULL
, 0ULL, backup_file
, 0, 0,
4842 1 | info
->reshape_active
,