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)
631 sysfs_wait(fd
, NULL
);
635 static int reshape_super(struct supertype
*st
, unsigned long long size
,
636 int level
, int layout
, int chunksize
, int raid_disks
,
637 int delta_disks
, char *backup_file
, char *dev
,
638 int direction
, int verbose
)
640 /* nothing extra to check in the native case */
641 if (!st
->ss
->external
)
643 if (!st
->ss
->reshape_super
||
644 !st
->ss
->manage_reshape
) {
645 pr_err("%s metadata does not support reshape\n",
650 return st
->ss
->reshape_super(st
, size
, level
, layout
, chunksize
,
651 raid_disks
, delta_disks
, backup_file
, dev
,
655 static void sync_metadata(struct supertype
*st
)
657 if (st
->ss
->external
) {
658 if (st
->update_tail
) {
659 flush_metadata_updates(st
);
660 st
->update_tail
= &st
->updates
;
662 st
->ss
->sync_metadata(st
);
666 static int subarray_set_num(char *container
, struct mdinfo
*sra
, char *name
, int n
)
668 /* when dealing with external metadata subarrays we need to be
669 * prepared to handle EAGAIN. The kernel may need to wait for
670 * mdmon to mark the array active so the kernel can handle
671 * allocations/writeback when preparing the reshape action
672 * (md_allow_write()). We temporarily disable safe_mode_delay
673 * to close a race with the array_state going clean before the
674 * next write to raid_disks / stripe_cache_size
679 /* only 'raid_disks' and 'stripe_cache_size' trigger md_allow_write */
681 (strcmp(name
, "raid_disks") != 0 &&
682 strcmp(name
, "stripe_cache_size") != 0))
683 return sysfs_set_num(sra
, NULL
, name
, n
);
685 rc
= sysfs_get_str(sra
, NULL
, "safe_mode_delay", safe
, sizeof(safe
));
688 sysfs_set_num(sra
, NULL
, "safe_mode_delay", 0);
689 rc
= sysfs_set_num(sra
, NULL
, name
, n
);
690 if (rc
< 0 && errno
== EAGAIN
) {
691 ping_monitor(container
);
692 /* if we get EAGAIN here then the monitor is not active
695 rc
= sysfs_set_num(sra
, NULL
, name
, n
);
697 sysfs_set_str(sra
, NULL
, "safe_mode_delay", safe
);
701 int start_reshape(struct mdinfo
*sra
, int already_running
,
702 int before_data_disks
, int data_disks
)
705 unsigned long long sync_max_to_set
;
707 sysfs_set_num(sra
, NULL
, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL
);
708 err
= sysfs_set_num(sra
, NULL
, "suspend_hi", sra
->reshape_progress
);
709 err
= err
?: sysfs_set_num(sra
, NULL
, "suspend_lo",
710 sra
->reshape_progress
);
711 if (before_data_disks
<= data_disks
)
712 sync_max_to_set
= sra
->reshape_progress
/ data_disks
;
714 sync_max_to_set
= (sra
->component_size
* data_disks
715 - sra
->reshape_progress
) / data_disks
;
716 if (!already_running
)
717 sysfs_set_num(sra
, NULL
, "sync_min", sync_max_to_set
);
718 err
= err
?: sysfs_set_num(sra
, NULL
, "sync_max", sync_max_to_set
);
719 if (!already_running
)
720 err
= err
?: sysfs_set_str(sra
, NULL
, "sync_action", "reshape");
725 void abort_reshape(struct mdinfo
*sra
)
727 sysfs_set_str(sra
, NULL
, "sync_action", "idle");
728 sysfs_set_num(sra
, NULL
, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL
);
729 sysfs_set_num(sra
, NULL
, "suspend_hi", 0);
730 sysfs_set_num(sra
, NULL
, "suspend_lo", 0);
731 sysfs_set_num(sra
, NULL
, "sync_min", 0);
732 sysfs_set_str(sra
, NULL
, "sync_max", "max");
735 int remove_disks_for_takeover(struct supertype
*st
,
740 struct mdinfo
*remaining
;
743 if (sra
->array
.level
== 10)
744 nr_of_copies
= layout
& 0xff;
745 else if (sra
->array
.level
== 1)
746 nr_of_copies
= sra
->array
.raid_disks
;
750 remaining
= sra
->devs
;
752 /* for each 'copy', select one device and remove from the list. */
753 for (slot
= 0; slot
< sra
->array
.raid_disks
; slot
+= nr_of_copies
) {
754 struct mdinfo
**diskp
;
757 /* Find a working device to keep */
758 for (diskp
= &remaining
; *diskp
; diskp
= &(*diskp
)->next
) {
759 struct mdinfo
*disk
= *diskp
;
761 if (disk
->disk
.raid_disk
< slot
)
763 if (disk
->disk
.raid_disk
>= slot
+ nr_of_copies
)
765 if (disk
->disk
.state
& (1<<MD_DISK_REMOVED
))
767 if (disk
->disk
.state
& (1<<MD_DISK_FAULTY
))
769 if (!(disk
->disk
.state
& (1<<MD_DISK_SYNC
)))
772 /* We have found a good disk to use! */
774 disk
->next
= sra
->devs
;
783 if (slot
< sra
->array
.raid_disks
) {
784 /* didn't find all slots */
790 sra
->devs
= remaining
;
794 /* Remove all 'remaining' devices from the array */
796 struct mdinfo
*sd
= remaining
;
797 remaining
= sd
->next
;
799 sysfs_set_str(sra
, sd
, "state", "faulty");
800 sysfs_set_str(sra
, sd
, "slot", "none");
801 /* for external metadata disks should be removed in mdmon */
802 if (!st
->ss
->external
)
803 sysfs_set_str(sra
, sd
, "state", "remove");
804 sd
->disk
.state
|= (1<<MD_DISK_REMOVED
);
805 sd
->disk
.state
&= ~(1<<MD_DISK_SYNC
);
806 sd
->next
= sra
->devs
;
812 void reshape_free_fdlist(int *fdlist
,
813 unsigned long long *offsets
,
818 for (i
= 0; i
< size
; i
++)
826 int reshape_prepare_fdlist(char *devname
,
830 unsigned long blocks
,
833 unsigned long long *offsets
)
839 for (d
= 0; d
<= nrdisks
; d
++)
842 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
843 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
845 if (sd
->disk
.state
& (1<<MD_DISK_SYNC
)) {
846 char *dn
= map_dev(sd
->disk
.major
,
848 fdlist
[sd
->disk
.raid_disk
]
849 = dev_open(dn
, O_RDONLY
);
850 offsets
[sd
->disk
.raid_disk
] = sd
->data_offset
*512;
851 if (fdlist
[sd
->disk
.raid_disk
] < 0) {
852 pr_err("%s: cannot open component %s\n",
853 devname
, dn
? dn
: "-unknown-");
857 } else if (backup_file
== NULL
) {
859 char *dn
= map_dev(sd
->disk
.major
,
861 fdlist
[d
] = dev_open(dn
, O_RDWR
);
862 offsets
[d
] = (sd
->data_offset
+ sra
->component_size
- blocks
- 8)*512;
864 pr_err("%s: cannot open component %s\n",
865 devname
, dn
? dn
: "-unknown-");
876 int reshape_open_backup_file(char *backup_file
,
881 unsigned long long *offsets
,
884 /* Return 1 on success, 0 on any form of failure */
885 /* need to check backup file is large enough */
891 *fdlist
= open(backup_file
, O_RDWR
|O_CREAT
|(restart
? O_TRUNC
: O_EXCL
),
895 pr_err("%s: cannot create backup file %s: %s\n",
896 devname
, backup_file
, strerror(errno
));
899 /* Guard against backup file being on array device.
900 * If array is partitioned or if LVM etc is in the
901 * way this will not notice, but it is better than
904 fstat(*fdlist
, &stb
);
907 if (stb
.st_rdev
== dev
) {
908 pr_err("backup file must NOT be"
909 " on the array being reshaped.\n");
915 for (i
=0; i
< blocks
+ 8 ; i
++) {
916 if (write(*fdlist
, buf
, 512) != 512) {
917 pr_err("%s: cannot create"
918 " backup file %s: %s\n",
919 devname
, backup_file
, strerror(errno
));
923 if (fsync(*fdlist
) != 0) {
924 pr_err("%s: cannot create backup file %s: %s\n",
925 devname
, backup_file
, strerror(errno
));
932 unsigned long compute_backup_blocks(int nchunk
, int ochunk
,
933 unsigned int ndata
, unsigned int odata
)
935 unsigned long a
, b
, blocks
;
936 /* So how much do we need to backup.
937 * We need an amount of data which is both a whole number of
938 * old stripes and a whole number of new stripes.
939 * So LCM for (chunksize*datadisks).
941 a
= (ochunk
/512) * odata
;
942 b
= (nchunk
/512) * ndata
;
945 /* LCM == product / GCD */
946 blocks
= (ochunk
/512) * (nchunk
/512) * odata
* ndata
/ a
;
951 char *analyse_change(char *devname
, struct mdinfo
*info
, struct reshape
*re
)
953 /* Based on the current array state in info->array and
954 * the changes in info->new_* etc, determine:
955 * - whether the change is possible
956 * - Intermediate level/raid_disks/layout
957 * - whether a restriping reshape is needed
958 * - number of sectors in minimum change unit. This
959 * will cover a whole number of stripes in 'before' and
962 * Return message if the change should be rejected
963 * NULL if the change can be achieved
965 * This can be called as part of starting a reshape, or
966 * when assembling an array that is undergoing reshape.
968 int near
, far
, offset
, copies
;
970 int old_chunk
, new_chunk
;
971 /* delta_parity records change in number of devices
972 * caused by level change
974 int delta_parity
= 0;
976 memset(re
, 0, sizeof(*re
));
978 /* If a new level not explicitly given, we assume no-change */
979 if (info
->new_level
== UnSet
)
980 info
->new_level
= info
->array
.level
;
983 switch (info
->new_level
) {
989 /* chunk size is meaningful, must divide component_size
992 if (info
->component_size
% (info
->new_chunk
/512)) {
993 unsigned long long shrink
= info
->component_size
;
994 shrink
&= ~(unsigned long long)(info
->new_chunk
/512-1);
995 pr_err("New chunk size (%dK) does not evenly divide device size (%lluk)\n",
996 info
->new_chunk
/1024, info
->component_size
/2);
997 pr_err("After shrinking any filesystem, \"mdadm --grow %s --size %llu\"\n",
999 pr_err("will shrink the array so the given chunk size would work.\n");
1004 return "chunk size not meaningful for this level";
1007 info
->new_chunk
= info
->array
.chunk_size
;
1009 switch (info
->array
.level
) {
1011 return "Cannot understand this RAID level";
1013 /* RAID1 can convert to RAID1 with different disks, or
1014 * raid5 with 2 disks, or
1017 if (info
->new_level
> 1 &&
1018 (info
->component_size
& 7))
1019 return "Cannot convert RAID1 of this size - "
1020 "reduce size to multiple of 4K first.";
1021 if (info
->new_level
== 0) {
1022 if (info
->delta_disks
!= UnSet
&&
1023 info
->delta_disks
!= 0)
1024 return "Cannot change number of disks "
1025 "with RAID1->RAID0 conversion";
1027 re
->before
.data_disks
= 1;
1028 re
->after
.data_disks
= 1;
1031 if (info
->new_level
== 1) {
1032 if (info
->delta_disks
== UnSet
)
1033 /* Don't know what to do */
1034 return "no change requested for Growing RAID1";
1038 if (info
->array
.raid_disks
== 2 &&
1039 info
->new_level
== 5) {
1042 re
->before
.data_disks
= 1;
1043 if (info
->delta_disks
!= UnSet
&&
1044 info
->delta_disks
!= 0)
1045 re
->after
.data_disks
= 1 + info
->delta_disks
;
1047 re
->after
.data_disks
= 1;
1048 if (re
->after
.data_disks
< 1)
1049 return "Number of disks too small for RAID5";
1051 re
->before
.layout
= ALGORITHM_LEFT_SYMMETRIC
;
1052 info
->array
.chunk_size
= 65536;
1055 /* Could do some multi-stage conversions, but leave that to
1058 return "Impossibly level change request for RAID1";
1061 /* RAID10 can be converted from near mode to
1062 * RAID0 by removing some devices.
1063 * It can also be reshaped if the kernel supports
1066 switch (info
->new_level
) {
1068 if ((info
->array
.layout
& ~0xff) != 0x100)
1069 return "Cannot Grow RAID10 with far/offset layout";
1070 /* number of devices must be multiple of number of copies */
1071 if (info
->array
.raid_disks
% (info
->array
.layout
& 0xff))
1072 return "RAID10 layout too complex for Grow operation";
1074 new_disks
= (info
->array
.raid_disks
1075 / (info
->array
.layout
& 0xff));
1076 if (info
->delta_disks
== UnSet
)
1077 info
->delta_disks
= (new_disks
1078 - info
->array
.raid_disks
);
1080 if (info
->delta_disks
!= new_disks
- info
->array
.raid_disks
)
1081 return "New number of raid-devices impossible for RAID10";
1082 if (info
->new_chunk
&&
1083 info
->new_chunk
!= info
->array
.chunk_size
)
1084 return "Cannot change chunk-size with RAID10 Grow";
1088 re
->before
.data_disks
= new_disks
;
1089 re
->after
.data_disks
= re
->before
.data_disks
;
1093 near
= info
->array
.layout
& 0xff;
1094 far
= (info
->array
.layout
>> 8) & 0xff;
1095 offset
= info
->array
.layout
& 0x10000;
1096 if (far
> 1 && !offset
)
1097 return "Cannot reshape RAID10 in far-mode";
1098 copies
= near
* far
;
1100 old_chunk
= info
->array
.chunk_size
* far
;
1102 if (info
->new_layout
== UnSet
)
1103 info
->new_layout
= info
->array
.layout
;
1105 near
= info
->new_layout
& 0xff;
1106 far
= (info
->new_layout
>> 8) & 0xff;
1107 offset
= info
->new_layout
& 0x10000;
1108 if (far
> 1 && !offset
)
1109 return "Cannot reshape RAID10 to far-mode";
1110 if (near
* far
!= copies
)
1111 return "Cannot change number of copies"
1112 " when reshaping RAID10";
1114 if (info
->delta_disks
== UnSet
)
1115 info
->delta_disks
= 0;
1116 new_disks
= (info
->array
.raid_disks
+
1119 new_chunk
= info
->new_chunk
* far
;
1122 re
->before
.layout
= info
->array
.layout
;
1123 re
->before
.data_disks
= info
->array
.raid_disks
;
1124 re
->after
.layout
= info
->new_layout
;
1125 re
->after
.data_disks
= new_disks
;
1126 /* For RAID10 we don't do backup but do allow reshape,
1127 * so set backup_blocks to INVALID_SECTORS rather than
1129 * And there is no need to synchronise stripes on both
1130 * 'old' and 'new'. So the important
1131 * number is the minimum data_offset difference
1132 * which is the larger of (offset copies * chunk).
1134 re
->backup_blocks
= INVALID_SECTORS
;
1135 re
->min_offset_change
= max(old_chunk
, new_chunk
) / 512;
1136 if (new_disks
< re
->before
.data_disks
&&
1137 info
->space_after
< re
->min_offset_change
)
1138 /* Reduce component size by one chunk */
1139 re
->new_size
= (info
->component_size
-
1140 re
->min_offset_change
);
1142 re
->new_size
= info
->component_size
;
1143 re
->new_size
= re
->new_size
* new_disks
/ copies
;
1147 return "RAID10 can only be changed to RAID0";
1150 /* RAID0 can be converted to RAID10, or to RAID456 */
1151 if (info
->new_level
== 10) {
1152 if (info
->new_layout
== UnSet
&& info
->delta_disks
== UnSet
) {
1153 /* Assume near=2 layout */
1154 info
->new_layout
= 0x102;
1155 info
->delta_disks
= info
->array
.raid_disks
;
1157 if (info
->new_layout
== UnSet
) {
1158 int copies
= 1 + (info
->delta_disks
1159 / info
->array
.raid_disks
);
1160 if (info
->array
.raid_disks
* (copies
-1)
1161 != info
->delta_disks
)
1162 return "Impossible number of devices"
1163 " for RAID0->RAID10";
1164 info
->new_layout
= 0x100 + copies
;
1166 if (info
->delta_disks
== UnSet
) {
1167 int copies
= info
->new_layout
& 0xff;
1168 if (info
->new_layout
!= 0x100 + copies
)
1169 return "New layout impossible"
1170 " for RAID0->RAID10";;
1171 info
->delta_disks
= (copies
- 1) *
1172 info
->array
.raid_disks
;
1174 if (info
->new_chunk
&&
1175 info
->new_chunk
!= info
->array
.chunk_size
)
1176 return "Cannot change chunk-size with RAID0->RAID10";
1179 re
->before
.data_disks
= (info
->array
.raid_disks
+
1181 re
->after
.data_disks
= re
->before
.data_disks
;
1182 re
->before
.layout
= info
->new_layout
;
1186 /* RAID0 can also covert to RAID0/4/5/6 by first converting to
1187 * a raid4 style layout of the final level.
1189 switch (info
->new_level
) {
1194 re
->before
.layout
= 0;
1199 re
->before
.layout
= ALGORITHM_PARITY_N
;
1200 if (info
->new_layout
== UnSet
)
1201 info
->new_layout
= map_name(r5layout
, "default");
1206 re
->before
.layout
= ALGORITHM_PARITY_N
;
1207 if (info
->new_layout
== UnSet
)
1208 info
->new_layout
= map_name(r6layout
, "default");
1211 return "Impossible level change requested";
1213 re
->before
.data_disks
= info
->array
.raid_disks
;
1214 /* determining 'after' layout happens outside this 'switch' */
1218 info
->array
.layout
= ALGORITHM_PARITY_N
;
1220 switch (info
->new_level
) {
1224 re
->level
= info
->array
.level
;
1225 re
->before
.data_disks
= info
->array
.raid_disks
- 1;
1226 re
->before
.layout
= info
->array
.layout
;
1230 re
->before
.data_disks
= info
->array
.raid_disks
- 1;
1231 re
->before
.layout
= info
->array
.layout
;
1236 re
->before
.data_disks
= info
->array
.raid_disks
- 1;
1237 switch (info
->array
.layout
) {
1238 case ALGORITHM_LEFT_ASYMMETRIC
:
1239 re
->before
.layout
= ALGORITHM_LEFT_ASYMMETRIC_6
;
1241 case ALGORITHM_RIGHT_ASYMMETRIC
:
1242 re
->before
.layout
= ALGORITHM_RIGHT_ASYMMETRIC_6
;
1244 case ALGORITHM_LEFT_SYMMETRIC
:
1245 re
->before
.layout
= ALGORITHM_LEFT_SYMMETRIC_6
;
1247 case ALGORITHM_RIGHT_SYMMETRIC
:
1248 re
->before
.layout
= ALGORITHM_RIGHT_SYMMETRIC_6
;
1250 case ALGORITHM_PARITY_0
:
1251 re
->before
.layout
= ALGORITHM_PARITY_0_6
;
1253 case ALGORITHM_PARITY_N
:
1254 re
->before
.layout
= ALGORITHM_PARITY_N_6
;
1257 return "Cannot convert an array with this layout";
1261 if (info
->array
.raid_disks
!= 2)
1262 return "Can only convert a 2-device array to RAID1";
1263 if (info
->delta_disks
!= UnSet
&&
1264 info
->delta_disks
!= 0)
1265 return "Cannot set raid_disk when "
1266 "converting RAID5->RAID1";
1268 info
->new_chunk
= 0;
1271 return "Impossible level change requested";
1275 switch (info
->new_level
) {
1281 re
->before
.data_disks
= info
->array
.raid_disks
- 2;
1282 re
->before
.layout
= info
->array
.layout
;
1285 return "Impossible level change requested";
1290 /* If we reached here then it looks like a re-stripe is
1291 * happening. We have determined the intermediate level
1292 * and initial raid_disks/layout and stored these in 're'.
1294 * We need to deduce the final layout that can be atomically
1295 * converted to the end state.
1297 switch (info
->new_level
) {
1299 /* We can only get to RAID0 from RAID4 or RAID5
1300 * with appropriate layout and one extra device
1302 if (re
->level
!= 4 && re
->level
!= 5)
1303 return "Cannot covert to RAID0 from this level";
1305 switch (re
->level
) {
1307 re
->before
.layout
= 0;
1308 re
->after
.layout
= 0;
1311 re
->after
.layout
= ALGORITHM_PARITY_N
;
1317 /* We can only get to RAID4 from RAID5 */
1318 if (re
->level
!= 4 && re
->level
!= 5)
1319 return "Cannot convert to RAID4 from this level";
1321 switch (re
->level
) {
1323 re
->before
.layout
= 0;
1324 re
->after
.layout
= 0;
1327 re
->after
.layout
= ALGORITHM_PARITY_N
;
1333 /* We get to RAID5 from RAID5 or RAID6 */
1334 if (re
->level
!= 5 && re
->level
!= 6)
1335 return "Cannot convert to RAID5 from this level";
1337 switch (re
->level
) {
1339 if (info
->new_layout
== UnSet
)
1340 re
->after
.layout
= re
->before
.layout
;
1342 re
->after
.layout
= info
->new_layout
;
1345 if (info
->new_layout
== UnSet
)
1346 info
->new_layout
= re
->before
.layout
;
1348 /* after.layout needs to be raid6 version of new_layout */
1349 if (info
->new_layout
== ALGORITHM_PARITY_N
)
1350 re
->after
.layout
= ALGORITHM_PARITY_N
;
1353 char *ls
= map_num(r5layout
, info
->new_layout
);
1356 /* Current RAID6 layout has a RAID5
1359 strcat(strcpy(layout
, ls
), "-6");
1360 l
= map_name(r6layout
, layout
);
1362 return "Cannot find RAID6 layout"
1365 /* Current RAID6 has no equivalent.
1366 * If it is already a '-6' layout we
1367 * can leave it unchanged, else we must
1370 ls
= map_num(r6layout
, info
->new_layout
);
1372 strcmp(ls
+strlen(ls
)-2, "-6") != 0)
1373 return "Please specify new layout";
1374 l
= info
->new_layout
;
1376 re
->after
.layout
= l
;
1382 /* We must already be at level 6 */
1384 return "Impossible level change";
1385 if (info
->new_layout
== UnSet
)
1386 re
->after
.layout
= info
->array
.layout
;
1388 re
->after
.layout
= info
->new_layout
;
1391 return "Impossible level change requested";
1393 if (info
->delta_disks
== UnSet
)
1394 info
->delta_disks
= delta_parity
;
1396 re
->after
.data_disks
= (re
->before
.data_disks
1399 switch (re
->level
) {
1400 case 6: re
->parity
= 2;
1403 case 5: re
->parity
= 1;
1405 default: re
->parity
= 0;
1408 /* So we have a restripe operation, we need to calculate the number
1409 * of blocks per reshape operation.
1411 re
->new_size
= info
->component_size
* re
->before
.data_disks
;
1412 if (info
->new_chunk
== 0)
1413 info
->new_chunk
= info
->array
.chunk_size
;
1414 if (re
->after
.data_disks
== re
->before
.data_disks
&&
1415 re
->after
.layout
== re
->before
.layout
&&
1416 info
->new_chunk
== info
->array
.chunk_size
) {
1417 /* Nothing to change, can change level immediately. */
1418 re
->level
= info
->new_level
;
1419 re
->backup_blocks
= 0;
1422 if (re
->after
.data_disks
== 1 && re
->before
.data_disks
== 1) {
1423 /* chunk and layout changes make no difference */
1424 re
->level
= info
->new_level
;
1425 re
->backup_blocks
= 0;
1429 if (re
->after
.data_disks
== re
->before
.data_disks
&&
1430 get_linux_version() < 2006032)
1431 return "in-place reshape is not safe before 2.6.32 - sorry.";
1433 if (re
->after
.data_disks
< re
->before
.data_disks
&&
1434 get_linux_version() < 2006030)
1435 return "reshape to fewer devices is not supported before 2.6.30 - sorry.";
1437 re
->backup_blocks
= compute_backup_blocks(
1438 info
->new_chunk
, info
->array
.chunk_size
,
1439 re
->after
.data_disks
,
1440 re
->before
.data_disks
);
1441 re
->min_offset_change
= re
->backup_blocks
/ re
->before
.data_disks
;
1443 re
->new_size
= info
->component_size
* re
->after
.data_disks
;
1447 static int set_array_size(struct supertype
*st
, struct mdinfo
*sra
,
1450 struct mdinfo
*info
;
1454 if ((st
== NULL
) || (sra
== NULL
))
1457 if (text_version
== NULL
)
1458 text_version
= sra
->text_version
;
1459 subarray
= strchr(text_version
+1, '/')+1;
1460 info
= st
->ss
->container_content(st
, subarray
);
1462 unsigned long long current_size
= 0;
1463 unsigned long long new_size
=
1464 info
->custom_array_size
/2;
1466 if (sysfs_get_ll(sra
, NULL
, "array_size", ¤t_size
) == 0 &&
1467 new_size
> current_size
) {
1468 if (sysfs_set_num(sra
, NULL
, "array_size", new_size
)
1470 dprintf("Error: Cannot set array size");
1473 dprintf("Array size changed");
1475 dprintf(" from %llu to %llu.\n",
1476 current_size
, new_size
);
1480 dprintf("Error: set_array_size(): info pointer in NULL\n");
1485 static int reshape_array(char *container
, int fd
, char *devname
,
1486 struct supertype
*st
, struct mdinfo
*info
,
1487 int force
, struct mddev_dev
*devlist
,
1488 unsigned long long data_offset
,
1489 char *backup_file
, int verbose
, int forked
,
1490 int restart
, int freeze_reshape
);
1491 static int reshape_container(char *container
, char *devname
,
1493 struct supertype
*st
,
1494 struct mdinfo
*info
,
1497 int verbose
, int restart
, int freeze_reshape
);
1499 int Grow_reshape(char *devname
, int fd
,
1500 struct mddev_dev
*devlist
,
1501 unsigned long long data_offset
,
1502 struct context
*c
, struct shape
*s
)
1504 /* Make some changes in the shape of an array.
1505 * The kernel must support the change.
1507 * There are three different changes. Each can trigger
1508 * a resync or recovery so we freeze that until we have
1509 * requested everything (if kernel supports freezing - 2.6.30).
1511 * - change size (i.e. component_size)
1513 * - change layout/chunksize/ndisks
1515 * The last can require a reshape. It is different on different
1516 * levels so we need to check the level before actioning it.
1517 * Some times the level change needs to be requested after the
1518 * reshape (e.g. raid6->raid5, raid5->raid0)
1521 struct mdu_array_info_s array
;
1523 struct supertype
*st
;
1524 char *subarray
= NULL
;
1528 char *container
= NULL
;
1531 struct mddev_dev
*dv
;
1537 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) < 0) {
1538 pr_err("%s is not an active md array - aborting\n",
1542 if (data_offset
!= INVALID_SECTORS
&& array
.level
!= 10
1543 && (array
.level
< 4 || array
.level
> 6)) {
1544 pr_err("--grow --data-offset not yet supported\n");
1549 (s
->chunk
|| s
->level
!= UnSet
|| s
->layout_str
|| s
->raiddisks
)) {
1550 pr_err("cannot change component size at the same time "
1551 "as other changes.\n"
1552 " Change size first, then check data is intact before "
1553 "making other changes.\n");
1557 if (s
->raiddisks
&& s
->raiddisks
< array
.raid_disks
&& array
.level
> 1 &&
1558 get_linux_version() < 2006032 &&
1559 !check_env("MDADM_FORCE_FEWER")) {
1560 pr_err("reducing the number of devices is not safe before Linux 2.6.32\n"
1561 " Please use a newer kernel\n");
1565 st
= super_by_fd(fd
, &subarray
);
1567 pr_err("Unable to determine metadata format for %s\n", devname
);
1570 if (s
->raiddisks
> st
->max_devs
) {
1571 pr_err("Cannot increase raid-disks on this array"
1572 " beyond %d\n", st
->max_devs
);
1576 /* in the external case we need to check that the requested reshape is
1577 * supported, and perform an initial check that the container holds the
1578 * pre-requisite spare devices (mdmon owns final validation)
1580 if (st
->ss
->external
) {
1584 container
= st
->container_devnm
;
1585 cfd
= open_dev_excl(st
->container_devnm
);
1587 container
= st
->devnm
;
1589 cfd
= open_dev_excl(st
->devnm
);
1593 pr_err("Unable to open container for %s\n",
1599 rv
= st
->ss
->load_container(st
, cfd
, NULL
);
1602 pr_err("Cannot read superblock for %s\n",
1608 /* check if operation is supported for metadata handler */
1609 if (st
->ss
->container_content
) {
1610 struct mdinfo
*cc
= NULL
;
1611 struct mdinfo
*content
= NULL
;
1613 cc
= st
->ss
->container_content(st
, subarray
);
1614 for (content
= cc
; content
; content
= content
->next
) {
1615 int allow_reshape
= 1;
1617 /* check if reshape is allowed based on metadata
1618 * indications stored in content.array.status
1620 if (content
->array
.state
& (1<<MD_SB_BLOCK_VOLUME
))
1622 if (content
->array
.state
1623 & (1<<MD_SB_BLOCK_CONTAINER_RESHAPE
))
1625 if (!allow_reshape
) {
1626 pr_err("cannot reshape arrays in"
1627 " container with unsupported"
1628 " metadata: %s(%s)\n",
1629 devname
, container
);
1637 if (mdmon_running(container
))
1638 st
->update_tail
= &st
->updates
;
1642 for (dv
= devlist
; dv
; dv
= dv
->next
)
1644 if (s
->raiddisks
> array
.raid_disks
&&
1645 array
.spare_disks
+added_disks
< (s
->raiddisks
- array
.raid_disks
) &&
1647 pr_err("Need %d spare%s to avoid degraded array,"
1648 " and only have %d.\n"
1649 " Use --force to over-ride this check.\n",
1650 s
->raiddisks
- array
.raid_disks
,
1651 s
->raiddisks
- array
.raid_disks
== 1 ? "" : "s",
1652 array
.spare_disks
+ added_disks
);
1656 sra
= sysfs_read(fd
, NULL
, GET_LEVEL
| GET_DISKS
| GET_DEVS
1657 | GET_STATE
| GET_VERSION
);
1659 if (st
->ss
->external
&& subarray
== NULL
) {
1660 array
.level
= LEVEL_CONTAINER
;
1661 sra
->array
.level
= LEVEL_CONTAINER
;
1664 pr_err("failed to read sysfs parameters for %s\n",
1668 frozen
= freeze(st
);
1670 /* freeze() already spewed the reason */
1673 } else if (frozen
< 0) {
1674 pr_err("%s is performing resync/recovery and cannot"
1675 " be reshaped\n", devname
);
1680 /* ========= set size =============== */
1681 if (s
->size
> 0 && (s
->size
== MAX_SIZE
|| s
->size
!= (unsigned)array
.size
)) {
1682 unsigned long long orig_size
= get_component_size(fd
)/2;
1683 unsigned long long min_csize
;
1685 int raid0_takeover
= 0;
1688 orig_size
= (unsigned) array
.size
;
1690 if (orig_size
== 0) {
1691 pr_err("Cannot set device size in this type of array.\n");
1696 if (reshape_super(st
, s
->size
, UnSet
, UnSet
, 0, 0, UnSet
, NULL
,
1697 devname
, APPLY_METADATA_CHANGES
, c
->verbose
> 0)) {
1702 if (st
->ss
->external
) {
1703 /* metadata can have size limitation
1704 * update size value according to metadata information
1706 struct mdinfo
*sizeinfo
=
1707 st
->ss
->container_content(st
, subarray
);
1709 unsigned long long new_size
=
1710 sizeinfo
->custom_array_size
/2;
1711 int data_disks
= get_data_disks(
1712 sizeinfo
->array
.level
,
1713 sizeinfo
->array
.layout
,
1714 sizeinfo
->array
.raid_disks
);
1715 new_size
/= data_disks
;
1716 dprintf("Metadata size correction from %llu to "
1717 "%llu (%llu)\n", orig_size
, new_size
,
1718 new_size
* data_disks
);
1720 sysfs_free(sizeinfo
);
1724 /* Update the size of each member device in case
1725 * they have been resized. This will never reduce
1726 * below the current used-size. The "size" attribute
1727 * understands '0' to mean 'max'.
1731 for (mdi
= sra
->devs
; mdi
; mdi
= mdi
->next
) {
1732 if (sysfs_set_num(sra
, mdi
, "size",
1733 s
->size
== MAX_SIZE
? 0 : s
->size
) < 0) {
1734 /* Probably kernel refusing to let us
1735 * reduce the size - not an error.
1739 if (array
.not_persistent
== 0 &&
1740 array
.major_version
== 0 &&
1741 get_linux_version() < 3001000) {
1742 /* Dangerous to allow size to exceed 2TB */
1743 unsigned long long csize
;
1744 if (sysfs_get_ll(sra
, mdi
, "size", &csize
) == 0) {
1745 if (csize
>= 2ULL*1024*1024*1024)
1746 csize
= 2ULL*1024*1024*1024;
1747 if ((min_csize
== 0 || (min_csize
1754 pr_err("Cannot set size on "
1755 "array members.\n");
1756 goto size_change_error
;
1758 if (min_csize
&& s
->size
> min_csize
) {
1759 pr_err("Cannot safely make this array "
1760 "use more than 2TB per device on this kernel.\n");
1762 goto size_change_error
;
1764 if (min_csize
&& s
->size
== MAX_SIZE
) {
1765 /* Don't let the kernel choose a size - it will get
1768 pr_err("Limited v0.90 array to "
1769 "2TB per device\n");
1770 s
->size
= min_csize
;
1772 if (st
->ss
->external
) {
1773 if (sra
->array
.level
== 0) {
1774 rv
= sysfs_set_str(sra
, NULL
, "level",
1778 /* get array parametes after takeover
1779 * to chane one parameter at time only
1781 rv
= ioctl(fd
, GET_ARRAY_INFO
, &array
);
1784 /* make sure mdmon is
1785 * aware of the new level */
1786 if (!mdmon_running(st
->container_devnm
))
1787 start_mdmon(st
->container_devnm
);
1788 ping_monitor(container
);
1789 if (mdmon_running(st
->container_devnm
) &&
1790 st
->update_tail
== NULL
)
1791 st
->update_tail
= &st
->updates
;
1794 if (s
->size
== MAX_SIZE
)
1796 array
.size
= s
->size
;
1797 if ((unsigned)array
.size
!= s
->size
) {
1798 /* got truncated to 32bit, write to
1799 * component_size instead
1802 rv
= sysfs_set_num(sra
, NULL
,
1803 "component_size", s
->size
);
1807 rv
= ioctl(fd
, SET_ARRAY_INFO
, &array
);
1809 /* manage array size when it is managed externally
1811 if ((rv
== 0) && st
->ss
->external
)
1812 rv
= set_array_size(st
, sra
, sra
->text_version
);
1815 if (raid0_takeover
) {
1816 /* do not recync non-existing parity,
1817 * we will drop it anyway
1819 sysfs_set_str(sra
, NULL
, "sync_action", "frozen");
1820 /* go back to raid0, drop parity disk
1822 sysfs_set_str(sra
, NULL
, "level", "raid0");
1823 ioctl(fd
, GET_ARRAY_INFO
, &array
);
1830 /* restore metadata */
1831 if (reshape_super(st
, orig_size
, UnSet
, UnSet
, 0, 0,
1832 UnSet
, NULL
, devname
,
1833 ROLLBACK_METADATA_CHANGES
,
1836 pr_err("Cannot set device size for %s: %s\n",
1837 devname
, strerror(err
));
1839 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
1840 cont_err("Bitmap must be removed before size can be changed\n");
1844 if (s
->assume_clean
) {
1845 /* This will fail on kernels older than 3.0 unless
1846 * a backport has been arranged.
1849 sysfs_set_str(sra
, NULL
, "resync_start", "none") < 0)
1850 pr_err("--assume-clean not supported with --grow on this kernel\n");
1852 ioctl(fd
, GET_ARRAY_INFO
, &array
);
1853 s
->size
= get_component_size(fd
)/2;
1855 s
->size
= array
.size
;
1856 if (c
->verbose
>= 0) {
1857 if (s
->size
== orig_size
)
1858 pr_err("component size of %s "
1859 "unchanged at %lluK\n",
1862 pr_err("component size of %s "
1863 "has been set to %lluK\n",
1867 } else if (array
.level
!= LEVEL_CONTAINER
) {
1868 s
->size
= get_component_size(fd
)/2;
1870 s
->size
= array
.size
;
1873 /* See if there is anything else to do */
1874 if ((s
->level
== UnSet
|| s
->level
== array
.level
) &&
1875 (s
->layout_str
== NULL
) &&
1876 (s
->chunk
== 0 || s
->chunk
== array
.chunk_size
) &&
1877 data_offset
== INVALID_SECTORS
&&
1878 (s
->raiddisks
== 0 || s
->raiddisks
== array
.raid_disks
)) {
1879 /* Nothing more to do */
1880 if (!changed
&& c
->verbose
>= 0)
1881 pr_err("%s: no change requested\n",
1886 /* ========= check for Raid10/Raid1 -> Raid0 conversion ===============
1887 * current implementation assumes that following conditions must be met:
1890 * - near_copies == 2
1892 if ((s
->level
== 0 && array
.level
== 10 && sra
&&
1893 array
.layout
== ((1 << 8) + 2) && !(array
.raid_disks
& 1)) ||
1894 (s
->level
== 0 && array
.level
== 1 && sra
)) {
1896 err
= remove_disks_for_takeover(st
, sra
, array
.layout
);
1898 dprintf(Name
": Array cannot be reshaped\n");
1904 /* Make sure mdmon has seen the device removal
1905 * and updated metadata before we continue with
1909 ping_monitor(container
);
1912 memset(&info
, 0, sizeof(info
));
1914 sysfs_init(&info
, fd
, NULL
);
1915 strcpy(info
.text_version
, sra
->text_version
);
1916 info
.component_size
= s
->size
*2;
1917 info
.new_level
= s
->level
;
1918 info
.new_chunk
= s
->chunk
* 1024;
1919 if (info
.array
.level
== LEVEL_CONTAINER
) {
1920 info
.delta_disks
= UnSet
;
1921 info
.array
.raid_disks
= s
->raiddisks
;
1922 } else if (s
->raiddisks
)
1923 info
.delta_disks
= s
->raiddisks
- info
.array
.raid_disks
;
1925 info
.delta_disks
= UnSet
;
1926 if (s
->layout_str
== NULL
) {
1927 info
.new_layout
= UnSet
;
1928 if (info
.array
.level
== 6 &&
1929 (info
.new_level
== 6 || info
.new_level
== UnSet
) &&
1930 info
.array
.layout
>= 16) {
1931 pr_err("%s has a non-standard layout. If you"
1932 " wish to preserve this\n", devname
);
1933 cont_err("during the reshape, please specify"
1934 " --layout=preserve\n");
1935 cont_err("If you want to change it, specify a"
1936 " layout or use --layout=normalise\n");
1940 } else if (strcmp(s
->layout_str
, "normalise") == 0 ||
1941 strcmp(s
->layout_str
, "normalize") == 0) {
1942 /* If we have a -6 RAID6 layout, remove the '-6'. */
1943 info
.new_layout
= UnSet
;
1944 if (info
.array
.level
== 6 && info
.new_level
== UnSet
) {
1946 strcpy(l
, map_num(r6layout
, info
.array
.layout
));
1947 h
= strrchr(l
, '-');
1948 if (h
&& strcmp(h
, "-6") == 0) {
1950 info
.new_layout
= map_name(r6layout
, l
);
1953 pr_err("%s is only meaningful when reshaping"
1954 " a RAID6 array.\n", s
->layout_str
);
1958 } else if (strcmp(s
->layout_str
, "preserve") == 0) {
1959 /* This means that a non-standard RAID6 layout
1962 * - When reshape a RAID6 (e.g. adding a device)
1963 * which is in a non-standard layout, it is OK
1964 * to preserve that layout.
1965 * - When converting a RAID5 to RAID6, leave it in
1966 * the XXX-6 layout, don't re-layout.
1968 if (info
.array
.level
== 6 && info
.new_level
== UnSet
)
1969 info
.new_layout
= info
.array
.layout
;
1970 else if (info
.array
.level
== 5 && info
.new_level
== 6) {
1972 strcpy(l
, map_num(r5layout
, info
.array
.layout
));
1974 info
.new_layout
= map_name(r6layout
, l
);
1976 pr_err("%s in only meaningful when reshaping"
1977 " to RAID6\n", s
->layout_str
);
1982 int l
= info
.new_level
;
1984 l
= info
.array
.level
;
1987 info
.new_layout
= map_name(r5layout
, s
->layout_str
);
1990 info
.new_layout
= map_name(r6layout
, s
->layout_str
);
1993 info
.new_layout
= parse_layout_10(s
->layout_str
);
1996 info
.new_layout
= parse_layout_faulty(s
->layout_str
);
1999 pr_err("layout not meaningful"
2000 " with this level\n");
2004 if (info
.new_layout
== UnSet
) {
2005 pr_err("layout %s not understood"
2006 " for this level\n",
2013 if (array
.level
== LEVEL_FAULTY
) {
2014 if (s
->level
!= UnSet
&& s
->level
!= array
.level
) {
2015 pr_err("cannot change level of Faulty device\n");
2019 pr_err("cannot set chunksize of Faulty device\n");
2022 if (s
->raiddisks
&& s
->raiddisks
!= 1) {
2023 pr_err("cannot set raid_disks of Faulty device\n");
2026 if (s
->layout_str
) {
2027 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) != 0) {
2028 dprintf("Cannot get array information.\n");
2031 array
.layout
= info
.new_layout
;
2032 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
2033 pr_err("failed to set new layout\n");
2035 } else if (c
->verbose
>= 0)
2036 printf("layout for %s set to %d\n",
2037 devname
, array
.layout
);
2039 } else if (array
.level
== LEVEL_CONTAINER
) {
2040 /* This change is to be applied to every array in the
2041 * container. This is only needed when the metadata imposes
2042 * restraints of the various arrays in the container.
2043 * Currently we only know that IMSM requires all arrays
2044 * to have the same number of devices so changing the
2045 * number of devices (On-Line Capacity Expansion) must be
2046 * performed at the level of the container
2048 rv
= reshape_container(container
, devname
, -1, st
, &info
,
2049 c
->force
, c
->backup_file
, c
->verbose
, 0, 0);
2052 /* get spare devices from external metadata
2054 if (st
->ss
->external
) {
2055 struct mdinfo
*info2
;
2057 info2
= st
->ss
->container_content(st
, subarray
);
2059 info
.array
.spare_disks
=
2060 info2
->array
.spare_disks
;
2065 /* Impose these changes on a single array. First
2066 * check that the metadata is OK with the change. */
2068 if (reshape_super(st
, 0, info
.new_level
,
2069 info
.new_layout
, info
.new_chunk
,
2070 info
.array
.raid_disks
, info
.delta_disks
,
2071 c
->backup_file
, devname
, APPLY_METADATA_CHANGES
,
2077 rv
= reshape_array(container
, fd
, devname
, st
, &info
, c
->force
,
2078 devlist
, data_offset
, c
->backup_file
, c
->verbose
,
2089 /* verify_reshape_position()
2090 * Function checks if reshape position in metadata is not farther
2091 * than position in md.
2093 * 0 : not valid sysfs entry
2094 * it can be caused by not started reshape, it should be started
2095 * by reshape array or raid0 array is before takeover
2096 * -1 : error, reshape position is obviously wrong
2097 * 1 : success, reshape progress correct or updated
2099 static int verify_reshape_position(struct mdinfo
*info
, int level
)
2105 /* read sync_max, failure can mean raid0 array */
2106 rv
= sysfs_get_str(info
, NULL
, "sync_max", buf
, 40);
2110 unsigned long long position
= strtoull(buf
, &ep
, 0);
2112 dprintf(Name
": Read sync_max sysfs entry is: %s\n", buf
);
2113 if (!(ep
== buf
|| (*ep
!= 0 && *ep
!= '\n' && *ep
!= ' '))) {
2114 position
*= get_data_disks(level
,
2116 info
->array
.raid_disks
);
2117 if (info
->reshape_progress
< position
) {
2118 dprintf("Corrected reshape progress (%llu) to "
2119 "md position (%llu)\n",
2120 info
->reshape_progress
, position
);
2121 info
->reshape_progress
= position
;
2123 } else if (info
->reshape_progress
> position
) {
2124 pr_err("Fatal error: array "
2125 "reshape was not properly frozen "
2126 "(expected reshape position is %llu, "
2127 "but reshape progress is %llu.\n",
2128 position
, info
->reshape_progress
);
2131 dprintf("Reshape position in md and metadata "
2136 } else if (rv
== 0) {
2137 /* for valid sysfs entry, 0-length content
2138 * should be indicated as error
2146 static unsigned long long choose_offset(unsigned long long lo
,
2147 unsigned long long hi
,
2148 unsigned long long min
,
2149 unsigned long long max
)
2151 /* Choose a new offset between hi and lo.
2152 * It must be between min and max, but
2153 * we would prefer something near the middle of hi/lo, and also
2154 * prefer to be aligned to a big power of 2.
2156 * So we start with the middle, then for each bit,
2157 * starting at '1' and increasing, if it is set, we either
2158 * add it or subtract it if possible, preferring the option
2159 * which is furthest from the boundary.
2161 * We stop once we get a 1MB alignment. As units are in sectors,
2162 * 1MB = 2*1024 sectors.
2164 unsigned long long choice
= (lo
+ hi
) / 2;
2165 unsigned long long bit
= 1;
2167 for (bit
= 1; bit
< 2*1024; bit
= bit
<< 1) {
2168 unsigned long long bigger
, smaller
;
2169 if (! (bit
& choice
))
2171 bigger
= choice
+ bit
;
2172 smaller
= choice
- bit
;
2173 if (bigger
> max
&& smaller
< min
)
2177 else if (smaller
< min
)
2179 else if (hi
- bigger
> smaller
- lo
)
2187 static int set_new_data_offset(struct mdinfo
*sra
, struct supertype
*st
,
2188 char *devname
, int delta_disks
,
2189 unsigned long long data_offset
,
2190 unsigned long long min
,
2196 unsigned long long before
, after
;
2198 /* Need to find min space before and after so same is used
2201 before
= UINT64_MAX
;
2203 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
2207 struct supertype
*st2
;
2208 struct mdinfo info2
;
2210 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
2212 dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 0);
2213 dfd
= dev_open(dn
, O_RDONLY
);
2215 pr_err("%s: cannot open component %s\n",
2216 devname
, dn
? dn
: "-unknown-");
2219 st2
= dup_super(st
);
2220 rv
= st2
->ss
->load_super(st2
,dfd
, NULL
);
2224 pr_err("%s: cannot get superblock from %s\n",
2228 st2
->ss
->getinfo_super(st2
, &info2
, NULL
);
2229 st2
->ss
->free_super(st2
);
2231 if (info2
.space_before
== 0 &&
2232 info2
.space_after
== 0) {
2233 /* Metadata doesn't support data_offset changes */
2236 if (before
> info2
.space_before
)
2237 before
= info2
.space_before
;
2238 if (after
> info2
.space_after
)
2239 after
= info2
.space_after
;
2241 if (data_offset
!= INVALID_SECTORS
) {
2243 if (info2
.data_offset
== data_offset
) {
2244 pr_err("%s: already has that data_offset\n",
2248 if (data_offset
< info2
.data_offset
)
2252 } else if ((data_offset
<= info2
.data_offset
&& dir
== 1) ||
2253 (data_offset
>= info2
.data_offset
&& dir
== -1)) {
2254 pr_err("%s: differing data offsets on devices make this --data-offset setting impossible\n",
2260 if (before
== UINT64_MAX
)
2261 /* impossible really, there must be no devices */
2264 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
2265 char *dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 0);
2266 unsigned long long new_data_offset
;
2268 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
2270 if (delta_disks
< 0) {
2271 /* Don't need any space as array is shrinking
2272 * just move data_offset up by min
2274 if (data_offset
== INVALID_SECTORS
)
2275 new_data_offset
= sd
->data_offset
+ min
;
2277 if (data_offset
< sd
->data_offset
+ min
) {
2278 pr_err("--data-offset too small for %s\n",
2282 new_data_offset
= data_offset
;
2284 } else if (delta_disks
> 0) {
2285 /* need space before */
2289 pr_err("Insufficient head-space for reshape on %s\n",
2293 if (data_offset
== INVALID_SECTORS
)
2294 new_data_offset
= sd
->data_offset
- min
;
2296 if (data_offset
> sd
->data_offset
- min
) {
2297 pr_err("--data-offset too large for %s\n",
2301 new_data_offset
= data_offset
;
2305 /* can move up or down. If 'data_offset'
2306 * was set we would have already decided,
2307 * so just choose direction with most space.
2314 sysfs_set_str(sra
, NULL
, "reshape_direction",
2315 dir
== 1 ? "backwards" : "forwards");
2317 /* Increase data offset */
2321 pr_err("Insufficient tail-space for reshape on %s\n",
2325 if (data_offset
!= INVALID_SECTORS
&&
2326 data_offset
< sd
->data_offset
+ min
) {
2327 pr_err("--data-offset too small on %s\n",
2331 if (data_offset
!= INVALID_SECTORS
)
2332 new_data_offset
= data_offset
;
2334 new_data_offset
= choose_offset(sd
->data_offset
,
2335 sd
->data_offset
+ after
,
2336 sd
->data_offset
+ min
,
2337 sd
->data_offset
+ after
);
2339 /* Decrease data offset */
2343 pr_err("insufficient head-room on %s\n",
2347 if (data_offset
!= INVALID_SECTORS
&&
2348 data_offset
< sd
->data_offset
- min
) {
2349 pr_err("--data-offset too small on %s\n",
2353 if (data_offset
!= INVALID_SECTORS
)
2354 new_data_offset
= data_offset
;
2356 new_data_offset
= choose_offset(sd
->data_offset
- before
,
2358 sd
->data_offset
- before
,
2359 sd
->data_offset
- min
);
2362 err
= sysfs_set_num(sra
, sd
, "new_offset", new_data_offset
);
2363 if (err
< 0 && errno
== E2BIG
) {
2364 /* try again after increasing data size to max */
2365 err
= sysfs_set_num(sra
, sd
, "size", 0);
2366 if (err
< 0 && errno
== EINVAL
&&
2367 !(sd
->disk
.state
& (1<<MD_DISK_SYNC
))) {
2368 /* some kernels have a bug where you cannot
2369 * use '0' on spare devices. */
2370 sysfs_set_num(sra
, sd
, "size",
2371 (sra
->component_size
+ after
)/2);
2373 err
= sysfs_set_num(sra
, sd
, "new_offset",
2377 if (errno
== E2BIG
&& data_offset
!= INVALID_SECTORS
) {
2378 pr_err("data-offset is too big for %s\n",
2382 if (sd
== sra
->devs
&&
2383 (errno
== ENOENT
|| errno
== E2BIG
))
2384 /* Early kernel, no 'new_offset' file,
2385 * or kernel doesn't like us.
2386 * For RAID5/6 this is not fatal
2389 pr_err("Cannot set new_offset for %s\n",
2398 /* Just use a backup file */
2402 static int raid10_reshape(char *container
, int fd
, char *devname
,
2403 struct supertype
*st
, struct mdinfo
*info
,
2404 struct reshape
*reshape
,
2405 unsigned long long data_offset
,
2406 int force
, int verbose
)
2408 /* Changing raid_disks, layout, chunksize or possibly
2409 * just data_offset for a RAID10.
2410 * We must always change data_offset. We change by at least
2411 * ->min_offset_change which is the largest of the old and new
2413 * If raid_disks is increasing, then data_offset must decrease
2414 * by at least this copy size.
2415 * If raid_disks is unchanged, data_offset must increase or
2416 * decrease by at least min_offset_change but preferably by much more.
2417 * We choose half of the available space.
2418 * If raid_disks is decreasing, data_offset must increase by
2419 * at least min_offset_change. To allow of this, component_size
2420 * must be decreased by the same amount.
2422 * So we calculate the required minimum and direction, possibly
2423 * reduce the component_size, then iterate through the devices
2424 * and set the new_data_offset.
2425 * If that all works, we set chunk_size, layout, raid_disks, and start
2429 unsigned long long min
;
2432 sra
= sysfs_read(fd
, NULL
,
2433 GET_COMPONENT
|GET_DEVS
|GET_OFFSET
|GET_STATE
|GET_CHUNK
2436 pr_err("%s: Cannot get array details from sysfs\n",
2440 min
= reshape
->min_offset_change
;
2442 if (info
->delta_disks
)
2443 sysfs_set_str(sra
, NULL
, "reshape_direction",
2444 info
->delta_disks
< 0 ? "backwards" : "forwards");
2445 if (info
->delta_disks
< 0 &&
2446 info
->space_after
< min
) {
2447 int rv
= sysfs_set_num(sra
, NULL
, "component_size",
2448 (sra
->component_size
-
2451 pr_err("cannot reduce component size\n");
2455 err
= set_new_data_offset(sra
, st
, devname
, info
->delta_disks
, data_offset
,
2458 pr_err("Cannot set new_data_offset: RAID10 reshape not\n");
2459 cont_err("supported on this kernel\n");
2465 if (!err
&& sysfs_set_num(sra
, NULL
, "chunk_size", info
->new_chunk
) < 0)
2467 if (!err
&& sysfs_set_num(sra
, NULL
, "layout", reshape
->after
.layout
) < 0)
2469 if (!err
&& sysfs_set_num(sra
, NULL
, "raid_disks",
2470 info
->array
.raid_disks
+ info
->delta_disks
) < 0)
2472 if (!err
&& sysfs_set_str(sra
, NULL
, "sync_action", "reshape") < 0)
2475 pr_err("Cannot set array shape for %s\n",
2478 (info
->array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2479 cont_err(" Bitmap must be removed before"
2480 " shape can be changed\n");
2490 static void get_space_after(int fd
, struct supertype
*st
, struct mdinfo
*info
)
2492 struct mdinfo
*sra
, *sd
;
2493 /* Initialisation to silence compiler warning */
2494 unsigned long long min_space_before
= 0, min_space_after
= 0;
2497 sra
= sysfs_read(fd
, NULL
, GET_DEVS
);
2500 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
2503 struct supertype
*st2
;
2504 struct mdinfo info2
;
2506 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
2508 dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 0);
2509 dfd
= dev_open(dn
, O_RDONLY
);
2512 st2
= dup_super(st
);
2513 if (st2
->ss
->load_super(st2
,dfd
, NULL
)) {
2519 st2
->ss
->getinfo_super(st2
, &info2
, NULL
);
2520 st2
->ss
->free_super(st2
);
2523 min_space_before
> info2
.space_before
)
2524 min_space_before
= info2
.space_before
;
2526 min_space_after
> info2
.space_after
)
2527 min_space_after
= info2
.space_after
;
2530 if (sd
== NULL
&& !first
) {
2531 info
->space_after
= min_space_after
;
2532 info
->space_before
= min_space_before
;
2537 static void update_cache_size(char *container
, struct mdinfo
*sra
,
2538 struct mdinfo
*info
,
2539 int disks
, unsigned long long blocks
)
2541 /* Check that the internal stripe cache is
2542 * large enough, or it won't work.
2543 * It must hold at least 4 stripes of the larger
2546 unsigned long cache
;
2547 cache
= max(info
->array
.chunk_size
, info
->new_chunk
);
2548 cache
*= 4; /* 4 stripes minimum */
2549 cache
/= 512; /* convert to sectors */
2550 /* make sure there is room for 'blocks' with a bit to spare */
2551 if (cache
< 16 + blocks
/ disks
)
2552 cache
= 16 + blocks
/ disks
;
2553 cache
/= (4096/512); /* Covert from sectors to pages */
2555 if (sra
->cache_size
< cache
)
2556 subarray_set_num(container
, sra
, "stripe_cache_size",
2560 static int impose_reshape(struct mdinfo
*sra
,
2561 struct mdinfo
*info
,
2562 struct supertype
*st
,
2565 char *devname
, char *container
,
2566 struct reshape
*reshape
)
2568 struct mdu_array_info_s array
;
2570 sra
->new_chunk
= info
->new_chunk
;
2573 /* for external metadata checkpoint saved by mdmon can be lost
2574 * or missed /due to e.g. crash/. Check if md is not during
2575 * restart farther than metadata points to.
2576 * If so, this means metadata information is obsolete.
2578 if (st
->ss
->external
)
2579 verify_reshape_position(info
, reshape
->level
);
2580 sra
->reshape_progress
= info
->reshape_progress
;
2582 sra
->reshape_progress
= 0;
2583 if (reshape
->after
.data_disks
< reshape
->before
.data_disks
)
2584 /* start from the end of the new array */
2585 sra
->reshape_progress
= (sra
->component_size
2586 * reshape
->after
.data_disks
);
2589 ioctl(fd
, GET_ARRAY_INFO
, &array
);
2590 if (info
->array
.chunk_size
== info
->new_chunk
&&
2591 reshape
->before
.layout
== reshape
->after
.layout
&&
2592 st
->ss
->external
== 0) {
2593 /* use SET_ARRAY_INFO but only if reshape hasn't started */
2594 array
.raid_disks
= reshape
->after
.data_disks
+ reshape
->parity
;
2596 ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
2599 pr_err("Cannot set device shape for %s: %s\n",
2600 devname
, strerror(errno
));
2603 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2604 cont_err("Bitmap must be removed before"
2605 " shape can be changed\n");
2609 } else if (!restart
) {
2610 /* set them all just in case some old 'new_*' value
2611 * persists from some earlier problem.
2614 if (sysfs_set_num(sra
, NULL
, "chunk_size", info
->new_chunk
) < 0)
2616 if (!err
&& sysfs_set_num(sra
, NULL
, "layout",
2617 reshape
->after
.layout
) < 0)
2619 if (!err
&& subarray_set_num(container
, sra
, "raid_disks",
2620 reshape
->after
.data_disks
+
2621 reshape
->parity
) < 0)
2624 pr_err("Cannot set device shape for %s\n",
2628 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2629 cont_err("Bitmap must be removed before"
2630 " shape can be changed\n");
2639 static int impose_level(int fd
, int level
, char *devname
, int verbose
)
2642 struct mdu_array_info_s array
;
2644 sysfs_init(&info
, fd
, NULL
);
2646 ioctl(fd
, GET_ARRAY_INFO
, &array
);
2648 (array
.level
>= 4 && array
.level
<= 6)) {
2649 /* To convert to RAID0 we need to fail and
2650 * remove any non-data devices. */
2653 int data_disks
= array
.raid_disks
- 1;
2654 if (array
.level
== 6)
2656 if (array
.level
== 5 &&
2657 array
.layout
!= ALGORITHM_PARITY_N
)
2659 if (array
.level
== 6 &&
2660 array
.layout
!= ALGORITHM_PARITY_N_6
)
2662 sysfs_set_str(&info
, NULL
,"sync_action", "idle");
2663 /* First remove any spares so no recovery starts */
2664 for (d
= 0, found
= 0;
2665 d
< MAX_DISKS
&& found
< array
.nr_disks
;
2667 mdu_disk_info_t disk
;
2669 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
2671 if (disk
.major
== 0 && disk
.minor
== 0)
2674 if ((disk
.state
& (1 << MD_DISK_ACTIVE
))
2675 && disk
.raid_disk
< data_disks
)
2678 ioctl(fd
, HOT_REMOVE_DISK
,
2679 makedev(disk
.major
, disk
.minor
));
2681 /* Now fail anything left */
2682 ioctl(fd
, GET_ARRAY_INFO
, &array
);
2683 for (d
= 0, found
= 0;
2684 d
< MAX_DISKS
&& found
< array
.nr_disks
;
2687 mdu_disk_info_t disk
;
2689 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
2691 if (disk
.major
== 0 && disk
.minor
== 0)
2694 if ((disk
.state
& (1 << MD_DISK_ACTIVE
))
2695 && disk
.raid_disk
< data_disks
)
2698 ioctl(fd
, SET_DISK_FAULTY
,
2699 makedev(disk
.major
, disk
.minor
));
2701 while (ioctl(fd
, HOT_REMOVE_DISK
,
2702 makedev(disk
.major
, disk
.minor
)) < 0
2709 c
= map_num(pers
, level
);
2711 int err
= sysfs_set_str(&info
, NULL
, "level", c
);
2714 pr_err("%s: could not set level to %s\n",
2717 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2718 cont_err("Bitmap must be removed"
2719 " before level can be changed\n");
2723 pr_err("level of %s changed to %s\n",
2729 static int reshape_array(char *container
, int fd
, char *devname
,
2730 struct supertype
*st
, struct mdinfo
*info
,
2731 int force
, struct mddev_dev
*devlist
,
2732 unsigned long long data_offset
,
2733 char *backup_file
, int verbose
, int forked
,
2734 int restart
, int freeze_reshape
)
2736 struct reshape reshape
;
2739 int orig_level
= UnSet
;
2743 struct mdu_array_info_s array
;
2746 struct mddev_dev
*dv
;
2750 unsigned long long *offsets
= NULL
;
2754 unsigned long blocks
;
2755 unsigned long long array_size
;
2757 struct mdinfo
*sra
= NULL
;
2759 /* when reshaping a RAID0, the component_size might be zero.
2760 * So try to fix that up.
2762 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) != 0) {
2763 dprintf("Cannot get array information.\n");
2766 if (array
.level
== 0 && info
->component_size
== 0) {
2767 get_dev_size(fd
, NULL
, &array_size
);
2768 info
->component_size
= array_size
/ array
.raid_disks
;
2771 if (array
.level
== 10)
2772 /* Need space_after info */
2773 get_space_after(fd
, st
, info
);
2775 if (info
->reshape_active
) {
2776 int new_level
= info
->new_level
;
2777 info
->new_level
= UnSet
;
2778 if (info
->delta_disks
> 0)
2779 info
->array
.raid_disks
-= info
->delta_disks
;
2780 msg
= analyse_change(devname
, info
, &reshape
);
2781 info
->new_level
= new_level
;
2782 if (info
->delta_disks
> 0)
2783 info
->array
.raid_disks
+= info
->delta_disks
;
2785 /* Make sure the array isn't read-only */
2786 ioctl(fd
, RESTART_ARRAY_RW
, 0);
2788 msg
= analyse_change(devname
, info
, &reshape
);
2790 /* if msg == "", error has already been printed */
2792 pr_err("%s\n", msg
);
2796 (reshape
.level
!= info
->array
.level
||
2797 reshape
.before
.layout
!= info
->array
.layout
||
2798 reshape
.before
.data_disks
+ reshape
.parity
2799 != info
->array
.raid_disks
- max(0, info
->delta_disks
))) {
2800 pr_err("reshape info is not in native format -"
2801 " cannot continue.\n");
2805 if (st
->ss
->external
&& restart
&& (info
->reshape_progress
== 0)) {
2806 /* When reshape is restarted from '0', very begin of array
2807 * it is possible that for external metadata reshape and array
2808 * configuration doesn't happen.
2809 * Check if md has the same opinion, and reshape is restarted
2810 * from 0. If so, this is regular reshape start after reshape
2811 * switch in metadata to next array only.
2813 if ((verify_reshape_position(info
, reshape
.level
) >= 0) &&
2814 (info
->reshape_progress
== 0))
2818 /* reshape already started. just skip to monitoring the reshape */
2819 if (reshape
.backup_blocks
== 0)
2821 if (restart
& RESHAPE_NO_BACKUP
)
2824 /* Need 'sra' down at 'started:' */
2825 sra
= sysfs_read(fd
, NULL
,
2826 GET_COMPONENT
|GET_DEVS
|GET_OFFSET
|GET_STATE
|GET_CHUNK
|
2829 pr_err("%s: Cannot get array details from sysfs\n",
2835 /* The container is frozen but the array may not be.
2836 * So freeze the array so spares don't get put to the wrong use
2837 * FIXME there should probably be a cleaner separation between
2838 * freeze_array and freeze_container.
2840 sysfs_freeze_array(info
);
2841 /* Check we have enough spares to not be degraded */
2843 for (dv
= devlist
; dv
; dv
=dv
->next
)
2845 spares_needed
= max(reshape
.before
.data_disks
,
2846 reshape
.after
.data_disks
)
2847 + reshape
.parity
- array
.raid_disks
;
2850 info
->new_level
> 1 && info
->array
.level
> 1 &&
2851 spares_needed
> info
->array
.spare_disks
+ added_disks
) {
2852 pr_err("Need %d spare%s to avoid degraded array,"
2853 " and only have %d.\n"
2854 " Use --force to over-ride this check.\n",
2856 spares_needed
== 1 ? "" : "s",
2857 info
->array
.spare_disks
+ added_disks
);
2860 /* Check we have enough spares to not fail */
2861 spares_needed
= max(reshape
.before
.data_disks
,
2862 reshape
.after
.data_disks
)
2864 if ((info
->new_level
> 1 || info
->new_level
== 0) &&
2865 spares_needed
> info
->array
.spare_disks
+added_disks
) {
2866 pr_err("Need %d spare%s to create working array,"
2867 " and only have %d.\n",
2869 spares_needed
== 1 ? "" : "s",
2870 info
->array
.spare_disks
+ added_disks
);
2874 if (reshape
.level
!= array
.level
) {
2875 int err
= impose_level(fd
, reshape
.level
, devname
, verbose
);
2878 info
->new_layout
= UnSet
; /* after level change,
2879 * layout is meaningless */
2880 orig_level
= array
.level
;
2881 sysfs_freeze_array(info
);
2883 if (reshape
.level
> 0 && st
->ss
->external
) {
2884 /* make sure mdmon is aware of the new level */
2885 if (mdmon_running(container
))
2886 flush_mdmon(container
);
2888 if (!mdmon_running(container
))
2889 start_mdmon(container
);
2890 ping_monitor(container
);
2891 if (mdmon_running(container
) &&
2892 st
->update_tail
== NULL
)
2893 st
->update_tail
= &st
->updates
;
2896 /* ->reshape_super might have chosen some spares from the
2897 * container that it wants to be part of the new array.
2898 * We can collect them with ->container_content and give
2899 * them to the kernel.
2901 if (st
->ss
->reshape_super
&& st
->ss
->container_content
) {
2902 char *subarray
= strchr(info
->text_version
+1, '/')+1;
2903 struct mdinfo
*info2
=
2904 st
->ss
->container_content(st
, subarray
);
2908 sysfs_init(info2
, fd
, st
->devnm
);
2909 /* When increasing number of devices, we need to set
2910 * new raid_disks before adding these, or they might
2913 if (reshape
.backup_blocks
&&
2914 reshape
.after
.data_disks
> reshape
.before
.data_disks
)
2915 subarray_set_num(container
, info2
, "raid_disks",
2916 reshape
.after
.data_disks
+
2918 for (d
= info2
->devs
; d
; d
= d
->next
) {
2919 if (d
->disk
.state
== 0 &&
2920 d
->disk
.raid_disk
>= 0) {
2921 /* This is a spare that wants to
2922 * be part of the array.
2924 add_disk(fd
, st
, info2
, d
);
2930 /* We might have been given some devices to add to the
2931 * array. Now that the array has been changed to the right
2932 * level and frozen, we can safely add them.
2935 Manage_subdevs(devname
, fd
, devlist
, verbose
,
2938 if (reshape
.backup_blocks
== 0 && data_offset
!= INVALID_SECTORS
)
2939 reshape
.backup_blocks
= reshape
.before
.data_disks
* info
->array
.chunk_size
/512;
2940 if (reshape
.backup_blocks
== 0) {
2941 /* No restriping needed, but we might need to impose
2942 * some more changes: layout, raid_disks, chunk_size
2944 /* read current array info */
2945 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) != 0) {
2946 dprintf("Cannot get array information.\n");
2949 /* compare current array info with new values and if
2950 * it is different update them to new */
2951 if (info
->new_layout
!= UnSet
&&
2952 info
->new_layout
!= array
.layout
) {
2953 array
.layout
= info
->new_layout
;
2954 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
2955 pr_err("failed to set new layout\n");
2957 } else if (verbose
>= 0)
2958 printf("layout for %s set to %d\n",
2959 devname
, array
.layout
);
2961 if (info
->delta_disks
!= UnSet
&&
2962 info
->delta_disks
!= 0 &&
2963 array
.raid_disks
!= (info
->array
.raid_disks
+ info
->delta_disks
)) {
2964 array
.raid_disks
+= info
->delta_disks
;
2965 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
2966 pr_err("failed to set raid disks\n");
2968 } else if (verbose
>= 0) {
2969 printf("raid_disks for %s set to %d\n",
2970 devname
, array
.raid_disks
);
2973 if (info
->new_chunk
!= 0 &&
2974 info
->new_chunk
!= array
.chunk_size
) {
2975 if (sysfs_set_num(info
, NULL
,
2976 "chunk_size", info
->new_chunk
) != 0) {
2977 pr_err("failed to set chunk size\n");
2979 } else if (verbose
>= 0)
2980 printf("chunk size for %s set to %d\n",
2981 devname
, array
.chunk_size
);
2988 * There are three possibilities.
2989 * 1/ The array will shrink.
2990 * We need to ensure the reshape will pause before reaching
2991 * the 'critical section'. We also need to fork and wait for
2992 * that to happen. When it does we
2993 * suspend/backup/complete/unfreeze
2995 * 2/ The array will not change size.
2996 * This requires that we keep a backup of a sliding window
2997 * so that we can restore data after a crash. So we need
2998 * to fork and monitor progress.
2999 * In future we will allow the data_offset to change, so
3000 * a sliding backup becomes unnecessary.
3002 * 3/ The array will grow. This is relatively easy.
3003 * However the kernel's restripe routines will cheerfully
3004 * overwrite some early data before it is safe. So we
3005 * need to make a backup of the early parts of the array
3006 * and be ready to restore it if rebuild aborts very early.
3007 * For externally managed metadata, we still need a forked
3008 * child to monitor the reshape and suspend IO over the region
3009 * that is being reshaped.
3011 * We backup data by writing it to one spare, or to a
3012 * file which was given on command line.
3014 * In each case, we first make sure that storage is available
3015 * for the required backup.
3017 * - request the shape change.
3018 * - fork to handle backup etc.
3020 /* Check that we can hold all the data */
3021 get_dev_size(fd
, NULL
, &array_size
);
3022 if (reshape
.new_size
< (array_size
/512)) {
3023 pr_err("this change will reduce the size of the array.\n"
3024 " use --grow --array-size first to truncate array.\n"
3025 " e.g. mdadm --grow %s --array-size %llu\n",
3026 devname
, reshape
.new_size
/2);
3030 if (array
.level
== 10) {
3031 /* Reshaping RAID10 does not require any data backup by
3032 * user-space. Instead it requires that the data_offset
3033 * is changed to avoid the need for backup.
3034 * So this is handled very separately
3037 /* Nothing to do. */
3039 return raid10_reshape(container
, fd
, devname
, st
, info
,
3040 &reshape
, data_offset
,
3043 sra
= sysfs_read(fd
, NULL
,
3044 GET_COMPONENT
|GET_DEVS
|GET_OFFSET
|GET_STATE
|GET_CHUNK
|
3047 pr_err("%s: Cannot get array details from sysfs\n",
3053 switch(set_new_data_offset(sra
, st
, devname
,
3054 reshape
.after
.data_disks
- reshape
.before
.data_disks
,
3056 reshape
.min_offset_change
, 1)) {
3060 /* Updated data_offset, so it's easy now */
3061 update_cache_size(container
, sra
, info
,
3062 min(reshape
.before
.data_disks
,
3063 reshape
.after
.data_disks
),
3064 reshape
.backup_blocks
);
3066 /* Right, everything seems fine. Let's kick things off.
3070 if (impose_reshape(sra
, info
, st
, fd
, restart
,
3071 devname
, container
, &reshape
) < 0)
3073 if (sysfs_set_str(sra
, NULL
, "sync_action", "reshape") < 0) {
3074 pr_err("Failed to initiate reshape!\n");
3077 if (info
->new_level
== reshape
.level
)
3079 /* need to adjust level when reshape completes */
3081 case -1: /* ignore error, but don't wait */
3083 default: /* parent */
3091 fd
= open_dev(sra
->sys_name
);
3093 impose_level(fd
, info
->new_level
, devname
, verbose
);
3095 case 1: /* Couldn't set data_offset, try the old way */
3096 if (data_offset
!= INVALID_SECTORS
) {
3097 pr_err("Cannot update data_offset on this array\n");
3104 /* Decide how many blocks (sectors) for a reshape
3105 * unit. The number we have so far is just a minimum
3107 blocks
= reshape
.backup_blocks
;
3108 if (reshape
.before
.data_disks
==
3109 reshape
.after
.data_disks
) {
3110 /* Make 'blocks' bigger for better throughput, but
3111 * not so big that we reject it below.
3112 * Try for 16 megabytes
3114 while (blocks
* 32 < sra
->component_size
&&
3118 pr_err("Need to backup %luK of critical "
3119 "section..\n", blocks
/2);
3121 if (blocks
>= sra
->component_size
/2) {
3122 pr_err("%s: Something wrong"
3123 " - reshape aborted\n",
3128 /* Now we need to open all these devices so we can read/write.
3130 nrdisks
= max(reshape
.before
.data_disks
,
3131 reshape
.after
.data_disks
) + reshape
.parity
3132 + sra
->array
.spare_disks
;
3133 fdlist
= xcalloc((1+nrdisks
), sizeof(int));
3134 offsets
= xcalloc((1+nrdisks
), sizeof(offsets
[0]));
3136 odisks
= reshape
.before
.data_disks
+ reshape
.parity
;
3137 d
= reshape_prepare_fdlist(devname
, sra
, odisks
,
3138 nrdisks
, blocks
, backup_file
,
3143 if ((st
->ss
->manage_reshape
== NULL
) ||
3144 (st
->ss
->recover_backup
== NULL
)) {
3145 if (backup_file
== NULL
) {
3146 if (reshape
.after
.data_disks
<=
3147 reshape
.before
.data_disks
) {
3148 pr_err("%s: Cannot grow - need backup-file\n",
3150 pr_err(" Please provide one with \"--backup=...\"\n");
3152 } else if (sra
->array
.spare_disks
== 0) {
3153 pr_err("%s: Cannot grow - "
3154 "need a spare or backup-file to backup "
3155 "critical section\n", devname
);
3159 if (!reshape_open_backup_file(backup_file
, fd
, devname
,
3161 fdlist
+d
, offsets
+d
,
3169 update_cache_size(container
, sra
, info
,
3170 min(reshape
.before
.data_disks
, reshape
.after
.data_disks
),
3173 /* Right, everything seems fine. Let's kick things off.
3174 * If only changing raid_disks, use ioctl, else use
3179 if (impose_reshape(sra
, info
, st
, fd
, restart
,
3180 devname
, container
, &reshape
) < 0)
3183 err
= start_reshape(sra
, restart
, reshape
.before
.data_disks
,
3184 reshape
.after
.data_disks
);
3186 pr_err("Cannot %s reshape for %s\n",
3187 restart
? "continue" : "start",
3192 sysfs_set_str(sra
, NULL
, "array_state", "active");
3193 if (freeze_reshape
) {
3197 pr_err("Reshape has to be continued from"
3198 " location %llu when root filesystem has been mounted.\n",
3199 sra
->reshape_progress
);
3203 /* Now we just need to kick off the reshape and watch, while
3204 * handling backups of the data...
3205 * This is all done by a forked background process.
3207 switch(forked
? 0 : fork()) {
3209 pr_err("Cannot run child to monitor reshape: %s\n",
3223 /* If another array on the same devices is busy, the
3224 * reshape will wait for them. This would mean that
3225 * the first section that we suspend will stay suspended
3226 * for a long time. So check on that possibility
3227 * by looking for "DELAYED" in /proc/mdstat, and if found,
3231 struct mdstat_ent
*mds
, *m
;
3233 mds
= mdstat_read(1, 0);
3234 for (m
= mds
; m
; m
= m
->next
)
3235 if (strcmp(m
->devnm
, sra
->sys_name
) == 0) {
3237 m
->percent
== RESYNC_DELAYED
)
3240 /* Haven't started the reshape thread
3247 if (delayed
== 1 && get_linux_version() < 3007000) {
3248 pr_err("Reshape is delayed, but cannot wait carefully with this kernel.\n"
3249 " You might experience problems until other reshapes complete.\n");
3253 mdstat_wait(30 - (delayed
-1) * 25);
3257 if (check_env("MDADM_GROW_VERIFY"))
3258 fd
= open(devname
, O_RDONLY
| O_DIRECT
);
3261 mlockall(MCL_FUTURE
);
3263 if (st
->ss
->external
) {
3264 /* metadata handler takes it from here */
3265 done
= st
->ss
->manage_reshape(
3266 fd
, sra
, &reshape
, st
, blocks
,
3268 d
- odisks
, fdlist
+odisks
,
3271 done
= child_monitor(
3272 fd
, sra
, &reshape
, st
, blocks
,
3274 d
- odisks
, fdlist
+odisks
,
3280 if (backup_file
&& done
)
3281 unlink(backup_file
);
3287 if (!st
->ss
->external
&&
3288 !(reshape
.before
.data_disks
!= reshape
.after
.data_disks
3289 && info
->custom_array_size
) &&
3290 info
->new_level
== reshape
.level
&&
3292 /* no need to wait for the reshape to finish as
3293 * there is nothing more to do.
3300 if (st
->ss
->external
) {
3301 /* Re-load the metadata as much could have changed */
3302 int cfd
= open_dev(st
->container_devnm
);
3304 flush_mdmon(container
);
3305 st
->ss
->free_super(st
);
3306 st
->ss
->load_container(st
, cfd
, container
);
3311 /* set new array size if required customer_array_size is used
3314 if (reshape
.before
.data_disks
!=
3315 reshape
.after
.data_disks
&&
3316 info
->custom_array_size
)
3317 set_array_size(st
, info
, info
->text_version
);
3319 if (info
->new_level
!= reshape
.level
) {
3321 fd
= open(devname
, O_RDONLY
);
3322 impose_level(fd
, info
->new_level
, devname
, verbose
);
3324 if (info
->new_level
== 0)
3325 st
->update_tail
= NULL
;
3337 if (orig_level
!= UnSet
&& sra
) {
3338 c
= map_num(pers
, orig_level
);
3339 if (c
&& sysfs_set_str(sra
, NULL
, "level", c
) == 0)
3340 pr_err("aborting level change\n");
3348 /* mdfd handle is passed to be closed in child process (after fork).
3350 int reshape_container(char *container
, char *devname
,
3352 struct supertype
*st
,
3353 struct mdinfo
*info
,
3356 int verbose
, int restart
, int freeze_reshape
)
3358 struct mdinfo
*cc
= NULL
;
3360 char last_devnm
[32] = "";
3362 /* component_size is not meaningful for a container,
3363 * so pass '0' meaning 'no change'
3366 reshape_super(st
, 0, info
->new_level
,
3367 info
->new_layout
, info
->new_chunk
,
3368 info
->array
.raid_disks
, info
->delta_disks
,
3369 backup_file
, devname
, APPLY_METADATA_CHANGES
,
3377 /* ping monitor to be sure that update is on disk
3379 ping_monitor(container
);
3382 case -1: /* error */
3383 perror("Cannot fork to complete reshape\n");
3386 default: /* parent */
3387 if (!freeze_reshape
)
3388 printf(Name
": multi-array reshape continues"
3389 " in background\n");
3396 /* close unused handle in child process
3402 /* For each member array with reshape_active,
3403 * we need to perform the reshape.
3404 * We pick the first array that needs reshaping and
3405 * reshape it. reshape_array() will re-read the metadata
3406 * so the next time through a different array should be
3407 * ready for reshape.
3408 * It is possible that the 'different' array will not
3409 * be assembled yet. In that case we simple exit.
3410 * When it is assembled, the mdadm which assembles it
3411 * will take over the reshape.
3413 struct mdinfo
*content
;
3415 struct mdstat_ent
*mdstat
;
3421 cc
= st
->ss
->container_content(st
, NULL
);
3423 for (content
= cc
; content
; content
= content
->next
) {
3425 if (!content
->reshape_active
)
3428 subarray
= strchr(content
->text_version
+1, '/')+1;
3429 mdstat
= mdstat_by_subdev(subarray
, container
);
3432 if (mdstat
->active
== 0) {
3433 pr_err("Skipping inactive array %s.\n",
3435 free_mdstat(mdstat
);
3444 devid
= devnm2devid(mdstat
->devnm
);
3445 adev
= map_dev(major(devid
), minor(devid
), 0);
3447 adev
= content
->text_version
;
3449 fd
= open_dev(mdstat
->devnm
);
3451 printf(Name
": Device %s cannot be opened for reshape.",
3456 if (strcmp(last_devnm
, mdstat
->devnm
) == 0) {
3457 /* Do not allow for multiple reshape_array() calls for
3459 * It can happen when reshape_array() returns without
3460 * error, when reshape is not finished (wrong reshape
3461 * starting/continuation conditions). Mdmon doesn't
3462 * switch to next array in container and reentry
3463 * conditions for the same array occur.
3464 * This is possibly interim until the behaviour of
3465 * reshape_array is resolved().
3467 printf(Name
": Multiple reshape execution detected for "
3468 "device %s.", adev
);
3472 strcpy(last_devnm
, mdstat
->devnm
);
3474 sysfs_init(content
, fd
, mdstat
->devnm
);
3476 if (mdmon_running(container
))
3477 flush_mdmon(container
);
3479 rv
= reshape_array(container
, fd
, adev
, st
,
3480 content
, force
, NULL
, INVALID_SECTORS
,
3481 backup_file
, verbose
, 1, restart
,
3485 if (freeze_reshape
) {
3494 if (mdmon_running(container
))
3495 flush_mdmon(container
);
3504 * We run a child process in the background which performs the following
3506 * - wait for resync to reach a certain point
3507 * - suspend io to the following section
3508 * - backup that section
3509 * - allow resync to proceed further
3511 * - discard the backup.
3513 * When are combined in slightly different ways in the three cases.
3515 * - suspend/backup/allow/wait/resume/discard
3517 * - allow/wait/suspend/backup/allow/wait/resume/discard
3519 * - wait/resume/discard/suspend/backup/allow
3521 * suspend/backup/allow always come together
3522 * wait/resume/discard do too.
3523 * For the same-size case we have two backups to improve flow.
3527 int progress_reshape(struct mdinfo
*info
, struct reshape
*reshape
,
3528 unsigned long long backup_point
,
3529 unsigned long long wait_point
,
3530 unsigned long long *suspend_point
,
3531 unsigned long long *reshape_completed
, int *frozen
)
3533 /* This function is called repeatedly by the reshape manager.
3534 * It determines how much progress can safely be made and allows
3536 * - 'info' identifies the array and particularly records in
3537 * ->reshape_progress the metadata's knowledge of progress
3538 * This is a sector offset from the start of the array
3539 * of the next array block to be relocated. This number
3540 * may increase from 0 or decrease from array_size, depending
3541 * on the type of reshape that is happening.
3542 * Note that in contrast, 'sync_completed' is a block count of the
3543 * reshape so far. It gives the distance between the start point
3544 * (head or tail of device) and the next place that data will be
3545 * written. It always increases.
3546 * - 'reshape' is the structure created by analyse_change
3547 * - 'backup_point' shows how much the metadata manager has backed-up
3548 * data. For reshapes with increasing progress, it is the next address
3549 * to be backed up, previous addresses have been backed-up. For
3550 * decreasing progress, it is the earliest address that has been
3551 * backed up - later address are also backed up.
3552 * So addresses between reshape_progress and backup_point are
3553 * backed up providing those are in the 'correct' order.
3554 * - 'wait_point' is an array address. When reshape_completed
3555 * passes this point, progress_reshape should return. It might
3556 * return earlier if it determines that ->reshape_progress needs
3557 * to be updated or further backup is needed.
3558 * - suspend_point is maintained by progress_reshape and the caller
3559 * should not touch it except to initialise to zero.
3560 * It is an array address and it only increases in 2.6.37 and earlier.
3561 * This makes it difficult to handle reducing reshapes with
3562 * external metadata.
3563 * However: it is similar to backup_point in that it records the
3564 * other end of a suspended region from reshape_progress.
3565 * it is moved to extend the region that is safe to backup and/or
3567 * - reshape_completed is read from sysfs and returned. The caller
3568 * should copy this into ->reshape_progress when it has reason to
3569 * believe that the metadata knows this, and any backup outside this
3573 * 1 if more data from backup_point - but only as far as suspend_point,
3574 * should be backed up
3575 * 0 if things are progressing smoothly
3576 * -1 if the reshape is finished because it is all done,
3577 * -2 if the reshape is finished due to an error.
3580 int advancing
= (reshape
->after
.data_disks
3581 >= reshape
->before
.data_disks
);
3582 unsigned long long need_backup
; /* All data between start of array and
3583 * here will at some point need to
3586 unsigned long long read_offset
, write_offset
;
3587 unsigned long long write_range
;
3588 unsigned long long max_progress
, target
, completed
;
3589 unsigned long long array_size
= (info
->component_size
3590 * reshape
->before
.data_disks
);
3594 /* First, we unsuspend any region that is now known to be safe.
3595 * If suspend_point is on the 'wrong' side of reshape_progress, then
3596 * we don't have or need suspension at the moment. This is true for
3597 * native metadata when we don't need to back-up.
3600 if (info
->reshape_progress
<= *suspend_point
)
3601 sysfs_set_num(info
, NULL
, "suspend_lo",
3602 info
->reshape_progress
);
3604 /* Note: this won't work in 2.6.37 and before.
3605 * Something somewhere should make sure we don't need it!
3607 if (info
->reshape_progress
>= *suspend_point
)
3608 sysfs_set_num(info
, NULL
, "suspend_hi",
3609 info
->reshape_progress
);
3612 /* Now work out how far it is safe to progress.
3613 * If the read_offset for ->reshape_progress is less than
3614 * 'blocks' beyond the write_offset, we can only progress as far
3616 * Otherwise we can progress until the write_offset for the new location
3617 * reaches (within 'blocks' of) the read_offset at the current location.
3618 * However that region must be suspended unless we are using native
3620 * If we need to suspend more, we limit it to 128M per device, which is
3621 * rather arbitrary and should be some time-based calculation.
3623 read_offset
= info
->reshape_progress
/ reshape
->before
.data_disks
;
3624 write_offset
= info
->reshape_progress
/ reshape
->after
.data_disks
;
3625 write_range
= info
->new_chunk
/512;
3626 if (reshape
->before
.data_disks
== reshape
->after
.data_disks
)
3627 need_backup
= array_size
;
3629 need_backup
= reshape
->backup_blocks
;
3631 if (read_offset
< write_offset
+ write_range
)
3632 max_progress
= backup_point
;
3636 reshape
->after
.data_disks
;
3638 if (read_offset
> write_offset
- write_range
)
3639 /* Can only progress as far as has been backed up,
3640 * which must be suspended */
3641 max_progress
= backup_point
;
3642 else if (info
->reshape_progress
<= need_backup
)
3643 max_progress
= backup_point
;
3645 if (info
->array
.major_version
>= 0)
3646 /* Can progress until backup is needed */
3647 max_progress
= need_backup
;
3649 /* Can progress until metadata update is required */
3652 reshape
->after
.data_disks
;
3653 /* but data must be suspended */
3654 if (max_progress
< *suspend_point
)
3655 max_progress
= *suspend_point
;
3660 /* We know it is safe to progress to 'max_progress' providing
3661 * it is suspended or we are using native metadata.
3662 * Consider extending suspend_point 128M per device if it
3663 * is less than 64M per device beyond reshape_progress.
3664 * But always do a multiple of 'blocks'
3665 * FIXME this is too big - it takes to long to complete
3668 target
= 64*1024*2 * min(reshape
->before
.data_disks
,
3669 reshape
->after
.data_disks
);
3670 target
/= reshape
->backup_blocks
;
3673 target
*= reshape
->backup_blocks
;
3675 /* For externally managed metadata we always need to suspend IO to
3676 * the area being reshaped so we regularly push suspend_point forward.
3677 * For native metadata we only need the suspend if we are going to do
3681 if ((need_backup
> info
->reshape_progress
3682 || info
->array
.major_version
< 0) &&
3683 *suspend_point
< info
->reshape_progress
+ target
) {
3684 if (need_backup
< *suspend_point
+ 2 * target
)
3685 *suspend_point
= need_backup
;
3686 else if (*suspend_point
+ 2 * target
< array_size
)
3687 *suspend_point
+= 2 * target
;
3689 *suspend_point
= array_size
;
3690 sysfs_set_num(info
, NULL
, "suspend_hi", *suspend_point
);
3691 if (max_progress
> *suspend_point
)
3692 max_progress
= *suspend_point
;
3695 if (info
->array
.major_version
>= 0) {
3696 /* Only need to suspend when about to backup */
3697 if (info
->reshape_progress
< need_backup
* 2 &&
3698 *suspend_point
> 0) {
3700 sysfs_set_num(info
, NULL
, "suspend_lo", 0);
3701 sysfs_set_num(info
, NULL
, "suspend_hi", need_backup
);
3704 /* Need to suspend continually */
3705 if (info
->reshape_progress
< *suspend_point
)
3706 *suspend_point
= info
->reshape_progress
;
3707 if (*suspend_point
+ target
< info
->reshape_progress
)
3708 /* No need to move suspend region yet */;
3710 if (*suspend_point
>= 2 * target
)
3711 *suspend_point
-= 2 * target
;
3714 sysfs_set_num(info
, NULL
, "suspend_lo",
3717 if (max_progress
< *suspend_point
)
3718 max_progress
= *suspend_point
;
3722 /* now set sync_max to allow that progress. sync_max, like
3723 * sync_completed is a count of sectors written per device, so
3724 * we find the difference between max_progress and the start point,
3725 * and divide that by after.data_disks to get a sync_max
3727 * At the same time we convert wait_point to a similar number
3728 * for comparing against sync_completed.
3730 /* scale down max_progress to per_disk */
3731 max_progress
/= reshape
->after
.data_disks
;
3732 /* Round to chunk size as some kernels give an erroneously high number */
3733 max_progress
/= info
->new_chunk
/512;
3734 max_progress
*= info
->new_chunk
/512;
3735 /* And round to old chunk size as the kernel wants that */
3736 max_progress
/= info
->array
.chunk_size
/512;
3737 max_progress
*= info
->array
.chunk_size
/512;
3738 /* Limit progress to the whole device */
3739 if (max_progress
> info
->component_size
)
3740 max_progress
= info
->component_size
;
3741 wait_point
/= reshape
->after
.data_disks
;
3743 /* switch from 'device offset' to 'processed block count' */
3744 max_progress
= info
->component_size
- max_progress
;
3745 wait_point
= info
->component_size
- wait_point
;
3749 sysfs_set_num(info
, NULL
, "sync_max", max_progress
);
3751 /* Now wait. If we have already reached the point that we were
3752 * asked to wait to, don't wait at all, else wait for any change.
3753 * We need to select on 'sync_completed' as that is the place that
3754 * notifications happen, but we are really interested in
3755 * 'reshape_position'
3757 fd
= sysfs_get_fd(info
, NULL
, "sync_completed");
3759 goto check_progress
;
3761 if (sysfs_fd_get_ll(fd
, &completed
) < 0)
3762 goto check_progress
;
3764 while (completed
< max_progress
&& completed
< wait_point
) {
3765 /* Check that sync_action is still 'reshape' to avoid
3766 * waiting forever on a dead array
3769 if (sysfs_get_str(info
, NULL
, "sync_action",
3771 strncmp(action
, "reshape", 7) != 0)
3773 /* Some kernels reset 'sync_completed' to zero
3774 * before setting 'sync_action' to 'idle'.
3775 * So we need these extra tests.
3777 if (completed
== 0 && advancing
3778 && info
->reshape_progress
> 0)
3780 if (completed
== 0 && !advancing
3781 && info
->reshape_progress
< (info
->component_size
3782 * reshape
->after
.data_disks
))
3784 sysfs_wait(fd
, NULL
);
3785 if (sysfs_fd_get_ll(fd
, &completed
) < 0)
3786 goto check_progress
;
3788 /* Some kernels reset 'sync_completed' to zero,
3789 * we need to have real point we are in md
3792 completed
= max_progress
;
3794 /* some kernels can give an incorrectly high 'completed' number */
3795 completed
/= (info
->new_chunk
/512);
3796 completed
*= (info
->new_chunk
/512);
3797 /* Convert 'completed' back in to a 'progress' number */
3798 completed
*= reshape
->after
.data_disks
;
3800 completed
= info
->component_size
* reshape
->after
.data_disks
3803 *reshape_completed
= completed
;
3807 /* We return the need_backup flag. Caller will decide
3808 * how much - a multiple of ->backup_blocks up to *suspend_point
3811 return need_backup
> info
->reshape_progress
;
3813 return need_backup
>= info
->reshape_progress
;
3816 /* if we couldn't read a number from sync_completed, then
3817 * either the reshape did complete, or it aborted.
3818 * We can tell which by checking for 'none' in reshape_position.
3819 * If it did abort, then it might immediately restart if it
3820 * it was just a device failure that leaves us degraded but
3824 if (sysfs_get_str(info
, NULL
, "reshape_position", buf
, sizeof(buf
)) < 0
3825 || strncmp(buf
, "none", 4) != 0) {
3826 /* The abort might only be temporary. Wait up to 10
3827 * seconds for fd to contain a valid number again.
3831 unsigned long long new_sync_max
;
3832 while (fd
>= 0 && rv
< 0 && wait
> 0) {
3833 if (sysfs_wait(fd
, &wait
) != 1)
3835 switch (sysfs_fd_get_ll(fd
, &completed
)) {
3837 /* all good again */
3839 /* If "sync_max" is no longer max_progress
3840 * we need to freeze things
3842 sysfs_get_ll(info
, NULL
, "sync_max", &new_sync_max
);
3843 *frozen
= (new_sync_max
!= max_progress
);
3845 case -2: /* read error - abort */
3852 return rv
; /* abort */
3854 /* Maybe racing with array shutdown - check state */
3857 if (sysfs_get_str(info
, NULL
, "array_state", buf
, sizeof(buf
)) < 0
3858 || strncmp(buf
, "inactive", 8) == 0
3859 || strncmp(buf
, "clear",5) == 0)
3860 return -2; /* abort */
3861 return -1; /* complete */
3865 /* FIXME return status is never checked */
3866 static int grow_backup(struct mdinfo
*sra
,
3867 unsigned long long offset
, /* per device */
3868 unsigned long stripes
, /* per device, in old chunks */
3869 int *sources
, unsigned long long *offsets
,
3870 int disks
, int chunk
, int level
, int layout
,
3871 int dests
, int *destfd
, unsigned long long *destoffsets
,
3872 int part
, int *degraded
,
3875 /* Backup 'blocks' sectors at 'offset' on each device of the array,
3876 * to storage 'destfd' (offset 'destoffsets'), after first
3877 * suspending IO. Then allow resync to continue
3878 * over the suspended section.
3879 * Use part 'part' of the backup-super-block.
3884 unsigned long long ll
;
3886 //printf("offset %llu\n", offset);
3892 /* Check that array hasn't become degraded, else we might backup the wrong data */
3893 if (sysfs_get_ll(sra
, NULL
, "degraded", &ll
) < 0)
3894 return -1; /* FIXME this error is ignored */
3895 new_degraded
= (int)ll
;
3896 if (new_degraded
!= *degraded
) {
3897 /* check each device to ensure it is still working */
3899 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
3900 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
3902 if (sd
->disk
.state
& (1<<MD_DISK_SYNC
)) {
3904 if (sysfs_get_str(sra
, sd
, "state", sbuf
, 20) < 0 ||
3905 strstr(sbuf
, "faulty") ||
3906 strstr(sbuf
, "in_sync") == NULL
) {
3907 /* this device is dead */
3908 sd
->disk
.state
= (1<<MD_DISK_FAULTY
);
3909 if (sd
->disk
.raid_disk
>= 0 &&
3910 sources
[sd
->disk
.raid_disk
] >= 0) {
3911 close(sources
[sd
->disk
.raid_disk
]);
3912 sources
[sd
->disk
.raid_disk
] = -1;
3917 *degraded
= new_degraded
;
3920 bsb
.arraystart2
= __cpu_to_le64(offset
* odata
);
3921 bsb
.length2
= __cpu_to_le64(stripes
* (chunk
/512) * odata
);
3923 bsb
.arraystart
= __cpu_to_le64(offset
* odata
);
3924 bsb
.length
= __cpu_to_le64(stripes
* (chunk
/512) * odata
);
3927 bsb
.magic
[15] = '2';
3928 for (i
= 0; i
< dests
; i
++)
3930 lseek64(destfd
[i
], destoffsets
[i
] + __le64_to_cpu(bsb
.devstart2
)*512, 0);
3932 lseek64(destfd
[i
], destoffsets
[i
], 0);
3934 rv
= save_stripes(sources
, offsets
,
3935 disks
, chunk
, level
, layout
,
3937 offset
*512*odata
, stripes
* chunk
* odata
,
3942 bsb
.mtime
= __cpu_to_le64(time(0));
3943 for (i
= 0; i
< dests
; i
++) {
3944 bsb
.devstart
= __cpu_to_le64(destoffsets
[i
]/512);
3946 bsb
.sb_csum
= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
));
3947 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0)
3948 bsb
.sb_csum2
= bsb_csum((char*)&bsb
,
3949 ((char*)&bsb
.sb_csum2
)-((char*)&bsb
));
3952 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
] - 4096, 0)
3953 != destoffsets
[i
] - 4096)
3955 if (write(destfd
[i
], &bsb
, 512) != 512)
3957 if (destoffsets
[i
] > 4096) {
3958 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
]+stripes
*chunk
*odata
, 0) !=
3959 destoffsets
[i
]+stripes
*chunk
*odata
)
3961 if (write(destfd
[i
], &bsb
, 512) != 512)
3971 /* in 2.6.30, the value reported by sync_completed can be
3972 * less that it should be by one stripe.
3973 * This only happens when reshape hits sync_max and pauses.
3974 * So allow wait_backup to either extent sync_max further
3975 * than strictly necessary, or return before the
3976 * sync has got quite as far as we would really like.
3977 * This is what 'blocks2' is for.
3978 * The various caller give appropriate values so that
3981 /* FIXME return value is often ignored */
3982 static int forget_backup(int dests
, int *destfd
,
3983 unsigned long long *destoffsets
,
3987 * Erase backup 'part' (which is 0 or 1)
3993 bsb
.arraystart2
= __cpu_to_le64(0);
3994 bsb
.length2
= __cpu_to_le64(0);
3996 bsb
.arraystart
= __cpu_to_le64(0);
3997 bsb
.length
= __cpu_to_le64(0);
3999 bsb
.mtime
= __cpu_to_le64(time(0));
4001 for (i
= 0; i
< dests
; i
++) {
4002 bsb
.devstart
= __cpu_to_le64(destoffsets
[i
]/512);
4003 bsb
.sb_csum
= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
));
4004 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0)
4005 bsb
.sb_csum2
= bsb_csum((char*)&bsb
,
4006 ((char*)&bsb
.sb_csum2
)-((char*)&bsb
));
4007 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
]-4096, 0) !=
4008 destoffsets
[i
]-4096)
4011 write(destfd
[i
], &bsb
, 512) != 512)
4018 static void fail(char *msg
)
4021 rv
= (write(2, msg
, strlen(msg
)) != (int)strlen(msg
));
4022 rv
|= (write(2, "\n", 1) != 1);
4026 static char *abuf
, *bbuf
;
4027 static unsigned long long abuflen
;
4028 static void validate(int afd
, int bfd
, unsigned long long offset
)
4030 /* check that the data in the backup against the array.
4031 * This is only used for regression testing and should not
4032 * be used while the array is active
4036 lseek64(bfd
, offset
- 4096, 0);
4037 if (read(bfd
, &bsb2
, 512) != 512)
4038 fail("cannot read bsb");
4039 if (bsb2
.sb_csum
!= bsb_csum((char*)&bsb2
,
4040 ((char*)&bsb2
.sb_csum
)-((char*)&bsb2
)))
4041 fail("first csum bad");
4042 if (memcmp(bsb2
.magic
, "md_backup_data", 14) != 0)
4043 fail("magic is bad");
4044 if (memcmp(bsb2
.magic
, "md_backup_data-2", 16) == 0 &&
4045 bsb2
.sb_csum2
!= bsb_csum((char*)&bsb2
,
4046 ((char*)&bsb2
.sb_csum2
)-((char*)&bsb2
)))
4047 fail("second csum bad");
4049 if (__le64_to_cpu(bsb2
.devstart
)*512 != offset
)
4050 fail("devstart is wrong");
4053 unsigned long long len
= __le64_to_cpu(bsb2
.length
)*512;
4055 if (abuflen
< len
) {
4059 if (posix_memalign((void**)&abuf
, 4096, abuflen
) ||
4060 posix_memalign((void**)&bbuf
, 4096, abuflen
)) {
4062 /* just stop validating on mem-alloc failure */
4067 lseek64(bfd
, offset
, 0);
4068 if ((unsigned long long)read(bfd
, bbuf
, len
) != len
) {
4069 //printf("len %llu\n", len);
4070 fail("read first backup failed");
4072 lseek64(afd
, __le64_to_cpu(bsb2
.arraystart
)*512, 0);
4073 if ((unsigned long long)read(afd
, abuf
, len
) != len
)
4074 fail("read first from array failed");
4075 if (memcmp(bbuf
, abuf
, len
) != 0) {
4078 printf("offset=%llu len=%llu\n",
4079 (unsigned long long)__le64_to_cpu(bsb2
.arraystart
)*512, len
);
4080 for (i
=0; i
<len
; i
++)
4081 if (bbuf
[i
] != abuf
[i
]) {
4082 printf("first diff byte %d\n", i
);
4086 fail("data1 compare failed");
4090 unsigned long long len
= __le64_to_cpu(bsb2
.length2
)*512;
4092 if (abuflen
< len
) {
4096 abuf
= xmalloc(abuflen
);
4097 bbuf
= xmalloc(abuflen
);
4100 lseek64(bfd
, offset
+__le64_to_cpu(bsb2
.devstart2
)*512, 0);
4101 if ((unsigned long long)read(bfd
, bbuf
, len
) != len
)
4102 fail("read second backup failed");
4103 lseek64(afd
, __le64_to_cpu(bsb2
.arraystart2
)*512, 0);
4104 if ((unsigned long long)read(afd
, abuf
, len
) != len
)
4105 fail("read second from array failed");
4106 if (memcmp(bbuf
, abuf
, len
) != 0)
4107 fail("data2 compare failed");
4111 int child_monitor(int afd
, struct mdinfo
*sra
, struct reshape
*reshape
,
4112 struct supertype
*st
, unsigned long blocks
,
4113 int *fds
, unsigned long long *offsets
,
4114 int dests
, int *destfd
, unsigned long long *destoffsets
)
4116 /* Monitor a reshape where backup is being performed using
4117 * 'native' mechanism - either to a backup file, or
4118 * to some space in a spare.
4122 unsigned long long speed
;
4123 unsigned long long suspend_point
, array_size
;
4124 unsigned long long backup_point
, wait_point
;
4125 unsigned long long reshape_completed
;
4127 int increasing
= reshape
->after
.data_disks
>= reshape
->before
.data_disks
;
4128 int part
= 0; /* The next part of the backup area to fill. It may already
4129 * be full, so we need to check */
4130 int level
= reshape
->level
;
4131 int layout
= reshape
->before
.layout
;
4132 int data
= reshape
->before
.data_disks
;
4133 int disks
= reshape
->before
.data_disks
+ reshape
->parity
;
4134 int chunk
= sra
->array
.chunk_size
;
4136 unsigned long stripes
;
4140 /* set up the backup-super-block. This requires the
4141 * uuid from the array.
4143 /* Find a superblock */
4144 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
4148 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
4150 dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 1);
4151 devfd
= dev_open(dn
, O_RDONLY
);
4154 ok
= st
->ss
->load_super(st
, devfd
, NULL
);
4160 pr_err("Cannot find a superblock\n");
4164 memset(&bsb
, 0, 512);
4165 memcpy(bsb
.magic
, "md_backup_data-1", 16);
4166 st
->ss
->uuid_from_super(st
, uuid
);
4167 memcpy(bsb
.set_uuid
, uuid
, 16);
4168 bsb
.mtime
= __cpu_to_le64(time(0));
4169 bsb
.devstart2
= blocks
;
4171 stripes
= blocks
/ (sra
->array
.chunk_size
/512) /
4172 reshape
->before
.data_disks
;
4174 if (posix_memalign((void**)&buf
, 4096, disks
* chunk
))
4175 /* Don't start the 'reshape' */
4177 if (reshape
->before
.data_disks
== reshape
->after
.data_disks
) {
4178 sysfs_get_ll(sra
, NULL
, "sync_speed_min", &speed
);
4179 sysfs_set_num(sra
, NULL
, "sync_speed_min", 200000);
4183 array_size
= sra
->component_size
* reshape
->after
.data_disks
;
4184 backup_point
= sra
->reshape_progress
;
4187 array_size
= sra
->component_size
* reshape
->before
.data_disks
;
4188 backup_point
= reshape
->backup_blocks
;
4189 suspend_point
= array_size
;
4195 /* Want to return as soon the oldest backup slot can
4196 * be released as that allows us to start backing up
4197 * some more, providing suspend_point has been
4198 * advanced, which it should have.
4201 wait_point
= array_size
;
4202 if (part
== 0 && __le64_to_cpu(bsb
.length
) > 0)
4203 wait_point
= (__le64_to_cpu(bsb
.arraystart
) +
4204 __le64_to_cpu(bsb
.length
));
4205 if (part
== 1 && __le64_to_cpu(bsb
.length2
) > 0)
4206 wait_point
= (__le64_to_cpu(bsb
.arraystart2
) +
4207 __le64_to_cpu(bsb
.length2
));
4210 if (part
== 0 && __le64_to_cpu(bsb
.length
) > 0)
4211 wait_point
= __le64_to_cpu(bsb
.arraystart
);
4212 if (part
== 1 && __le64_to_cpu(bsb
.length2
) > 0)
4213 wait_point
= __le64_to_cpu(bsb
.arraystart2
);
4216 reshape_completed
= sra
->reshape_progress
;
4217 rv
= progress_reshape(sra
, reshape
,
4218 backup_point
, wait_point
,
4219 &suspend_point
, &reshape_completed
,
4221 /* external metadata would need to ping_monitor here */
4222 sra
->reshape_progress
= reshape_completed
;
4224 /* Clear any backup region that is before 'here' */
4226 if (__le64_to_cpu(bsb
.length
) > 0 &&
4227 reshape_completed
>= (__le64_to_cpu(bsb
.arraystart
) +
4228 __le64_to_cpu(bsb
.length
)))
4229 forget_backup(dests
, destfd
,
4231 if (__le64_to_cpu(bsb
.length2
) > 0 &&
4232 reshape_completed
>= (__le64_to_cpu(bsb
.arraystart2
) +
4233 __le64_to_cpu(bsb
.length2
)))
4234 forget_backup(dests
, destfd
,
4237 if (__le64_to_cpu(bsb
.length
) > 0 &&
4238 reshape_completed
<= (__le64_to_cpu(bsb
.arraystart
)))
4239 forget_backup(dests
, destfd
,
4241 if (__le64_to_cpu(bsb
.length2
) > 0 &&
4242 reshape_completed
<= (__le64_to_cpu(bsb
.arraystart2
)))
4243 forget_backup(dests
, destfd
,
4252 if (rv
== 0 && increasing
&& !st
->ss
->external
) {
4253 /* No longer need to monitor this reshape */
4259 unsigned long long offset
;
4260 unsigned long actual_stripes
;
4261 /* Need to backup some data.
4262 * If 'part' is not used and the desired
4263 * backup size is suspended, do a backup,
4264 * then consider the next part.
4266 /* Check that 'part' is unused */
4267 if (part
== 0 && __le64_to_cpu(bsb
.length
) != 0)
4269 if (part
== 1 && __le64_to_cpu(bsb
.length2
) != 0)
4272 offset
= backup_point
/ data
;
4273 actual_stripes
= stripes
;
4275 if (offset
+ actual_stripes
* (chunk
/512) >
4276 sra
->component_size
)
4277 actual_stripes
= ((sra
->component_size
- offset
)
4279 if (offset
+ actual_stripes
* (chunk
/512) >
4283 if (offset
< actual_stripes
* (chunk
/512))
4284 actual_stripes
= offset
/ (chunk
/512);
4285 offset
-= actual_stripes
* (chunk
/512);
4286 if (offset
< suspend_point
/data
)
4289 if (actual_stripes
== 0)
4291 grow_backup(sra
, offset
, actual_stripes
,
4293 disks
, chunk
, level
, layout
,
4294 dests
, destfd
, destoffsets
,
4295 part
, °raded
, buf
);
4296 validate(afd
, destfd
[0], destoffsets
[0]);
4297 /* record where 'part' is up to */
4300 backup_point
+= actual_stripes
* (chunk
/512) * data
;
4302 backup_point
-= actual_stripes
* (chunk
/512) * data
;
4306 /* FIXME maybe call progress_reshape one more time instead */
4307 abort_reshape(sra
); /* remove any remaining suspension */
4308 if (reshape
->before
.data_disks
== reshape
->after
.data_disks
)
4309 sysfs_set_num(sra
, NULL
, "sync_speed_min", speed
);
4315 * If any spare contains md_back_data-1 which is recent wrt mtime,
4316 * write that data into the array and update the super blocks with
4317 * the new reshape_progress
4319 int Grow_restart(struct supertype
*st
, struct mdinfo
*info
, int *fdlist
, int cnt
,
4320 char *backup_file
, int verbose
)
4324 unsigned long long *offsets
;
4325 unsigned long long nstripe
, ostripe
;
4328 odata
= info
->array
.raid_disks
- info
->delta_disks
- 1;
4329 if (info
->array
.level
== 6) odata
--; /* number of data disks */
4330 ndata
= info
->array
.raid_disks
- 1;
4331 if (info
->new_level
== 6) ndata
--;
4333 old_disks
= info
->array
.raid_disks
- info
->delta_disks
;
4335 if (info
->delta_disks
<= 0)
4336 /* Didn't grow, so the backup file must have
4340 for (i
=old_disks
-(backup_file
?1:0); i
<cnt
; i
++) {
4341 struct mdinfo dinfo
;
4344 char *devname
, namebuf
[20];
4345 unsigned long long lo
, hi
;
4347 /* This was a spare and may have some saved data on it.
4348 * Load the superblock, find and load the
4349 * backup_super_block.
4350 * If either fail, go on to next device.
4351 * If the backup contains no new info, just return
4352 * else restore data and update all superblocks
4354 if (i
== old_disks
-1) {
4355 fd
= open(backup_file
, O_RDONLY
);
4357 pr_err("backup file %s inaccessible: %s\n",
4358 backup_file
, strerror(errno
));
4361 devname
= backup_file
;
4366 if (st
->ss
->load_super(st
, fd
, NULL
))
4369 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
4370 st
->ss
->free_super(st
);
4373 (dinfo
.data_offset
+ dinfo
.component_size
- 8) <<9,
4375 pr_err("Cannot seek on device %d\n", i
);
4376 continue; /* Cannot seek */
4378 sprintf(namebuf
, "device-%d", i
);
4381 if (read(fd
, &bsb
, sizeof(bsb
)) != sizeof(bsb
)) {
4383 pr_err("Cannot read from %s\n", devname
);
4384 continue; /* Cannot read */
4386 if (memcmp(bsb
.magic
, "md_backup_data-1", 16) != 0 &&
4387 memcmp(bsb
.magic
, "md_backup_data-2", 16) != 0) {
4389 pr_err("No backup metadata on %s\n", devname
);
4392 if (bsb
.sb_csum
!= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
))) {
4394 pr_err("Bad backup-metadata checksum on %s\n", devname
);
4395 continue; /* bad checksum */
4397 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0 &&
4398 bsb
.sb_csum2
!= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum2
)-((char*)&bsb
))) {
4400 pr_err("Bad backup-metadata checksum2 on %s\n", devname
);
4401 continue; /* Bad second checksum */
4403 if (memcmp(bsb
.set_uuid
,info
->uuid
, 16) != 0) {
4405 pr_err("Wrong uuid on backup-metadata on %s\n", devname
);
4406 continue; /* Wrong uuid */
4409 /* array utime and backup-mtime should be updated at much the same time, but it seems that
4410 * sometimes they aren't... So allow considerable flexability in matching, and allow
4411 * this test to be overridden by an environment variable.
4413 if (info
->array
.utime
> (int)__le64_to_cpu(bsb
.mtime
) + 2*60*60 ||
4414 info
->array
.utime
< (int)__le64_to_cpu(bsb
.mtime
) - 10*60) {
4415 if (check_env("MDADM_GROW_ALLOW_OLD")) {
4416 pr_err("accepting backup with timestamp %lu "
4417 "for array with timestamp %lu\n",
4418 (unsigned long)__le64_to_cpu(bsb
.mtime
),
4419 (unsigned long)info
->array
.utime
);
4421 pr_err("too-old timestamp on backup-metadata on %s\n", devname
);
4422 pr_err("If you think it is should be safe, try 'export MDADM_GROW_ALLOW_OLD=1'\n");
4423 continue; /* time stamp is too bad */
4427 if (bsb
.magic
[15] == '1') {
4428 if (bsb
.length
== 0)
4430 if (info
->delta_disks
>= 0) {
4431 /* reshape_progress is increasing */
4432 if (__le64_to_cpu(bsb
.arraystart
)
4433 + __le64_to_cpu(bsb
.length
)
4434 < info
->reshape_progress
) {
4437 pr_err("backup-metadata found on %s but is not needed\n", devname
);
4438 continue; /* No new data here */
4441 /* reshape_progress is decreasing */
4442 if (__le64_to_cpu(bsb
.arraystart
) >=
4443 info
->reshape_progress
)
4444 goto nonew
; /* No new data here */
4447 if (bsb
.length
== 0 && bsb
.length2
== 0)
4449 if (info
->delta_disks
>= 0) {
4450 /* reshape_progress is increasing */
4451 if ((__le64_to_cpu(bsb
.arraystart
)
4452 + __le64_to_cpu(bsb
.length
)
4453 < info
->reshape_progress
)
4455 (__le64_to_cpu(bsb
.arraystart2
)
4456 + __le64_to_cpu(bsb
.length2
)
4457 < info
->reshape_progress
))
4458 goto nonew
; /* No new data here */
4460 /* reshape_progress is decreasing */
4461 if (__le64_to_cpu(bsb
.arraystart
) >=
4462 info
->reshape_progress
&&
4463 __le64_to_cpu(bsb
.arraystart2
) >=
4464 info
->reshape_progress
)
4465 goto nonew
; /* No new data here */
4468 if (lseek64(fd
, __le64_to_cpu(bsb
.devstart
)*512, 0)< 0) {
4471 pr_err("Failed to verify secondary backup-metadata block on %s\n",
4473 continue; /* Cannot seek */
4475 /* There should be a duplicate backup superblock 4k before here */
4476 if (lseek64(fd
, -4096, 1) < 0 ||
4477 read(fd
, &bsb2
, sizeof(bsb2
)) != sizeof(bsb2
))
4478 goto second_fail
; /* Cannot find leading superblock */
4479 if (bsb
.magic
[15] == '1')
4480 bsbsize
= offsetof(struct mdp_backup_super
, pad1
);
4482 bsbsize
= offsetof(struct mdp_backup_super
, pad
);
4483 if (memcmp(&bsb2
, &bsb
, bsbsize
) != 0)
4484 goto second_fail
; /* Cannot find leading superblock */
4486 /* Now need the data offsets for all devices. */
4487 offsets
= xmalloc(sizeof(*offsets
)*info
->array
.raid_disks
);
4488 for(j
=0; j
<info
->array
.raid_disks
; j
++) {
4491 if (st
->ss
->load_super(st
, fdlist
[j
], NULL
))
4492 /* FIXME should be this be an error */
4494 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
4495 st
->ss
->free_super(st
);
4496 offsets
[j
] = dinfo
.data_offset
* 512;
4498 printf(Name
": restoring critical section\n");
4500 if (restore_stripes(fdlist
, offsets
,
4501 info
->array
.raid_disks
,
4505 fd
, __le64_to_cpu(bsb
.devstart
)*512,
4506 __le64_to_cpu(bsb
.arraystart
)*512,
4507 __le64_to_cpu(bsb
.length
)*512, NULL
)) {
4508 /* didn't succeed, so giveup */
4510 pr_err("Error restoring backup from %s\n",
4516 if (bsb
.magic
[15] == '2' &&
4517 restore_stripes(fdlist
, offsets
,
4518 info
->array
.raid_disks
,
4522 fd
, __le64_to_cpu(bsb
.devstart
)*512 +
4523 __le64_to_cpu(bsb
.devstart2
)*512,
4524 __le64_to_cpu(bsb
.arraystart2
)*512,
4525 __le64_to_cpu(bsb
.length2
)*512, NULL
)) {
4526 /* didn't succeed, so giveup */
4528 pr_err("Error restoring second backup from %s\n",
4536 /* Ok, so the data is restored. Let's update those superblocks. */
4540 lo
= __le64_to_cpu(bsb
.arraystart
);
4541 hi
= lo
+ __le64_to_cpu(bsb
.length
);
4543 if (bsb
.magic
[15] == '2' && bsb
.length2
) {
4544 unsigned long long lo1
, hi1
;
4545 lo1
= __le64_to_cpu(bsb
.arraystart2
);
4546 hi1
= lo1
+ __le64_to_cpu(bsb
.length2
);
4550 } else if (lo
< lo1
)
4556 (info
->reshape_progress
< lo
||
4557 info
->reshape_progress
> hi
))
4558 /* backup does not affect reshape_progress*/ ;
4559 else if (info
->delta_disks
>= 0) {
4560 info
->reshape_progress
= __le64_to_cpu(bsb
.arraystart
) +
4561 __le64_to_cpu(bsb
.length
);
4562 if (bsb
.magic
[15] == '2') {
4563 unsigned long long p2
= __le64_to_cpu(bsb
.arraystart2
) +
4564 __le64_to_cpu(bsb
.length2
);
4565 if (p2
> info
->reshape_progress
)
4566 info
->reshape_progress
= p2
;
4569 info
->reshape_progress
= __le64_to_cpu(bsb
.arraystart
);
4570 if (bsb
.magic
[15] == '2') {
4571 unsigned long long p2
= __le64_to_cpu(bsb
.arraystart2
);
4572 if (p2
< info
->reshape_progress
)
4573 info
->reshape_progress
= p2
;
4576 for (j
=0; j
<info
->array
.raid_disks
; j
++) {
4579 if (st
->ss
->load_super(st
, fdlist
[j
], NULL
))
4581 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
4582 dinfo
.reshape_progress
= info
->reshape_progress
;
4583 st
->ss
->update_super(st
, &dinfo
,
4584 "_reshape_progress",
4586 st
->ss
->store_super(st
, fdlist
[j
]);
4587 st
->ss
->free_super(st
);
4591 /* Didn't find any backup data, try to see if any
4594 if (info
->delta_disks
< 0) {
4595 /* When shrinking, the critical section is at the end.
4596 * So see if we are before the critical section.
4598 unsigned long long first_block
;
4599 nstripe
= ostripe
= 0;
4601 while (ostripe
>= nstripe
) {
4602 ostripe
+= info
->array
.chunk_size
/ 512;
4603 first_block
= ostripe
* odata
;
4604 nstripe
= first_block
/ ndata
/ (info
->new_chunk
/512) *
4605 (info
->new_chunk
/512);
4608 if (info
->reshape_progress
>= first_block
)
4611 if (info
->delta_disks
> 0) {
4612 /* See if we are beyond the critical section. */
4613 unsigned long long last_block
;
4614 nstripe
= ostripe
= 0;
4616 while (nstripe
>= ostripe
) {
4617 nstripe
+= info
->new_chunk
/ 512;
4618 last_block
= nstripe
* ndata
;
4619 ostripe
= last_block
/ odata
/ (info
->array
.chunk_size
/512) *
4620 (info
->array
.chunk_size
/512);
4623 if (info
->reshape_progress
>= last_block
)
4626 /* needed to recover critical section! */
4628 pr_err("Failed to find backup of critical section\n");
4632 int Grow_continue_command(char *devname
, int fd
,
4633 char *backup_file
, int verbose
)
4636 struct supertype
*st
= NULL
;
4637 struct mdinfo
*content
= NULL
;
4638 struct mdinfo array
;
4639 char *subarray
= NULL
;
4640 struct mdinfo
*cc
= NULL
;
4641 struct mdstat_ent
*mdstat
= NULL
;
4645 dprintf("Grow continue from command line called for %s\n",
4648 st
= super_by_fd(fd
, &subarray
);
4649 if (!st
|| !st
->ss
) {
4650 pr_err("Unable to determine metadata format for %s\n",
4654 dprintf("Grow continue is run for ");
4655 if (st
->ss
->external
== 0) {
4657 dprintf("native array (%s)\n", devname
);
4658 if (ioctl(fd
, GET_ARRAY_INFO
, &array
.array
) < 0) {
4659 pr_err("%s is not an active md array -"
4660 " aborting\n", devname
);
4662 goto Grow_continue_command_exit
;
4665 /* Need to load a superblock.
4666 * FIXME we should really get what we need from
4669 for (d
= 0; d
< MAX_DISKS
; d
++) {
4670 mdu_disk_info_t disk
;
4674 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
4676 if (disk
.major
== 0 && disk
.minor
== 0)
4678 if ((disk
.state
& (1 << MD_DISK_ACTIVE
)) == 0)
4680 dv
= map_dev(disk
.major
, disk
.minor
, 1);
4683 fd2
= dev_open(dv
, O_RDONLY
);
4686 err
= st
->ss
->load_super(st
, fd2
, NULL
);
4692 if (d
== MAX_DISKS
) {
4693 pr_err("Unable to load metadata for %s\n",
4696 goto Grow_continue_command_exit
;
4698 st
->ss
->getinfo_super(st
, content
, NULL
);
4703 dprintf("subarray (%s)\n", subarray
);
4704 container
= st
->container_devnm
;
4705 cfd
= open_dev_excl(st
->container_devnm
);
4707 container
= st
->devnm
;
4709 cfd
= open_dev_excl(st
->devnm
);
4710 dprintf("container (%s)\n", container
);
4714 pr_err("Unable to open container "
4715 "for %s\n", devname
);
4717 goto Grow_continue_command_exit
;
4720 /* find in container array under reshape
4722 ret_val
= st
->ss
->load_container(st
, cfd
, NULL
);
4724 pr_err("Cannot read superblock for %s\n",
4727 goto Grow_continue_command_exit
;
4730 cc
= st
->ss
->container_content(st
, subarray
);
4731 for (content
= cc
; content
; content
= content
->next
) {
4733 int allow_reshape
= 1;
4735 if (content
->reshape_active
== 0)
4737 /* The decision about array or container wide
4738 * reshape is taken in Grow_continue based
4739 * content->reshape_active state, therefore we
4740 * need to check_reshape based on
4741 * reshape_active and subarray name
4743 if (content
->array
.state
& (1<<MD_SB_BLOCK_VOLUME
))
4745 if (content
->reshape_active
== CONTAINER_RESHAPE
&&
4746 (content
->array
.state
4747 & (1<<MD_SB_BLOCK_CONTAINER_RESHAPE
)))
4750 if (!allow_reshape
) {
4751 pr_err("cannot continue reshape of an array"
4752 " in container with unsupported"
4753 " metadata: %s(%s)\n",
4754 devname
, container
);
4756 goto Grow_continue_command_exit
;
4759 array
= strchr(content
->text_version
+1, '/')+1;
4760 mdstat
= mdstat_by_subdev(array
, container
);
4763 if (mdstat
->active
== 0) {
4764 pr_err("Skipping inactive array %s.\n",
4766 free_mdstat(mdstat
);
4773 pr_err("Unable to determine reshaped "
4774 "array for %s\n", devname
);
4776 goto Grow_continue_command_exit
;
4778 fd2
= open_dev(mdstat
->devnm
);
4780 pr_err("cannot open (%s)\n", mdstat
->devnm
);
4782 goto Grow_continue_command_exit
;
4785 sysfs_init(content
, fd2
, mdstat
->devnm
);
4787 /* start mdmon in case it is not running
4789 if (!mdmon_running(container
))
4790 start_mdmon(container
);
4791 ping_monitor(container
);
4793 if (mdmon_running(container
))
4794 st
->update_tail
= &st
->updates
;
4796 pr_err("No mdmon found. "
4797 "Grow cannot continue.\n");
4799 goto Grow_continue_command_exit
;
4803 /* verify that array under reshape is started from
4806 if (verify_reshape_position(content
, content
->array
.level
) < 0) {
4808 goto Grow_continue_command_exit
;
4813 ret_val
= Grow_continue(fd
, st
, content
, backup_file
, 0);
4815 Grow_continue_command_exit
:
4820 st
->ss
->free_super(st
);
4821 free_mdstat(mdstat
);
4828 int Grow_continue(int mdfd
, struct supertype
*st
, struct mdinfo
*info
,
4829 char *backup_file
, int freeze_reshape
)
4833 if (!info
->reshape_active
)
4836 if (st
->ss
->external
) {
4837 int cfd
= open_dev(st
->container_devnm
);
4842 st
->ss
->load_container(st
, cfd
, st
->container_devnm
);
4844 ret_val
= reshape_container(st
->container_devnm
, NULL
, mdfd
,
4845 st
, info
, 0, backup_file
,
4847 1 | info
->reshape_active
,
4850 ret_val
= reshape_array(NULL
, mdfd
, "array", st
, info
, 1,
4851 NULL
, INVALID_SECTORS
,
4853 1 | info
->reshape_active
,