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>
28 #if ! defined(__BIG_ENDIAN) && ! defined(__LITTLE_ENDIAN)
29 #error no endian defined
35 #define offsetof(t,f) ((size_t)&(((t*)0)->f))
38 int restore_backup(struct supertype
*st
,
39 struct mdinfo
*content
,
49 int disk_count
= next_spare
+ working_disks
;
51 dprintf("Called restore_backup()\n");
52 fdlist
= xmalloc(sizeof(int) * disk_count
);
54 for (i
= 0; i
< next_spare
; i
++)
56 for (dev
= content
->devs
; dev
; dev
= dev
->next
) {
62 fd
= dev_open(buf
, O_RDWR
);
64 if (dev
->disk
.raid_disk
>= 0)
65 fdlist
[dev
->disk
.raid_disk
] = fd
;
67 fdlist
[next_spare
++] = fd
;
70 if (st
->ss
->external
&& st
->ss
->recover_backup
)
71 err
= st
->ss
->recover_backup(st
, content
);
73 err
= Grow_restart(st
, content
, fdlist
, next_spare
,
74 backup_file
, verbose
> 0);
76 while (next_spare
> 0) {
78 if (fdlist
[next_spare
] >= 0)
79 close(fdlist
[next_spare
]);
83 pr_err("Failed to restore critical"
84 " section for reshape - sorry.\n");
86 pr_err("Possibly you need"
87 " to specify a --backup-file\n");
91 dprintf("restore_backup() returns status OK.\n");
95 int Grow_Add_device(char *devname
, int fd
, char *newdev
)
97 /* Add a device to an active array.
98 * Currently, just extend a linear array.
99 * This requires writing a new superblock on the
100 * new device, calling the kernel to add the device,
101 * and if that succeeds, update the superblock on
103 * This means that we need to *find* all other devices.
110 struct supertype
*st
= NULL
;
111 char *subarray
= NULL
;
113 if (ioctl(fd
, GET_ARRAY_INFO
, &info
.array
) < 0) {
114 pr_err("cannot get array info for %s\n", devname
);
118 if (info
.array
.level
!= -1) {
119 pr_err("can only add devices to linear arrays\n");
123 st
= super_by_fd(fd
, &subarray
);
125 pr_err("cannot handle arrays with superblock version %d\n",
126 info
.array
.major_version
);
131 pr_err("Cannot grow linear sub-arrays yet\n");
137 nfd
= open(newdev
, O_RDWR
|O_EXCL
|O_DIRECT
);
139 pr_err("cannot open %s\n", newdev
);
144 if ((stb
.st_mode
& S_IFMT
) != S_IFBLK
) {
145 pr_err("%s is not a block device!\n", newdev
);
150 /* now check out all the devices and make sure we can read the
152 for (d
=0 ; d
< info
.array
.raid_disks
; d
++) {
153 mdu_disk_info_t disk
;
156 st
->ss
->free_super(st
);
159 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0) {
160 pr_err("cannot get device detail for device %d\n",
166 dv
= map_dev(disk
.major
, disk
.minor
, 1);
168 pr_err("cannot find device file for device %d\n",
174 fd2
= dev_open(dv
, O_RDWR
);
176 pr_err("cannot open device file %s\n", dv
);
182 if (st
->ss
->load_super(st
, fd2
, NULL
)) {
183 pr_err("cannot find super block on %s\n", dv
);
191 /* Ok, looks good. Lets update the superblock and write it out to
195 info
.disk
.number
= d
;
196 info
.disk
.major
= major(stb
.st_rdev
);
197 info
.disk
.minor
= minor(stb
.st_rdev
);
198 info
.disk
.raid_disk
= d
;
199 info
.disk
.state
= (1 << MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
);
200 st
->ss
->update_super(st
, &info
, "linear-grow-new", newdev
,
203 if (st
->ss
->store_super(st
, nfd
)) {
204 pr_err("Cannot store new superblock on %s\n",
211 if (ioctl(fd
, ADD_NEW_DISK
, &info
.disk
) != 0) {
212 pr_err("Cannot add new disk to this array\n");
215 /* Well, that seems to have worked.
216 * Now go through and update all superblocks
219 if (ioctl(fd
, GET_ARRAY_INFO
, &info
.array
) < 0) {
220 pr_err("cannot get array info for %s\n", devname
);
225 for (d
=0 ; d
< info
.array
.raid_disks
; d
++) {
226 mdu_disk_info_t disk
;
230 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0) {
231 pr_err("cannot get device detail for device %d\n",
235 dv
= map_dev(disk
.major
, disk
.minor
, 1);
237 pr_err("cannot find device file for device %d\n",
241 fd2
= dev_open(dv
, O_RDWR
);
243 pr_err("cannot open device file %s\n", dv
);
246 if (st
->ss
->load_super(st
, fd2
, NULL
)) {
247 pr_err("cannot find super block on %s\n", dv
);
251 info
.array
.raid_disks
= nd
+1;
252 info
.array
.nr_disks
= nd
+1;
253 info
.array
.active_disks
= nd
+1;
254 info
.array
.working_disks
= nd
+1;
256 st
->ss
->update_super(st
, &info
, "linear-grow-update", dv
,
259 if (st
->ss
->store_super(st
, fd2
)) {
260 pr_err("Cannot store new superblock on %s\n", dv
);
270 int Grow_addbitmap(char *devname
, int fd
, struct context
*c
, struct shape
*s
)
273 * First check that array doesn't have a bitmap
274 * Then create the bitmap
277 * For internal bitmaps, we need to check the version,
278 * find all the active devices, and write the bitmap block
281 mdu_bitmap_file_t bmf
;
282 mdu_array_info_t array
;
283 struct supertype
*st
;
284 char *subarray
= NULL
;
285 int major
= BITMAP_MAJOR_HI
;
286 int vers
= md_get_version(fd
);
287 unsigned long long bitmapsize
, array_size
;
290 major
= BITMAP_MAJOR_HOSTENDIAN
;
291 pr_err("Warning - bitmaps created on this kernel"
292 " are not portable\n"
293 " between different architectures. Consider upgrading"
294 " the Linux kernel.\n");
297 if (ioctl(fd
, GET_BITMAP_FILE
, &bmf
) != 0) {
299 pr_err("Memory allocation failure.\n");
301 pr_err("bitmaps not supported by this kernel.\n");
304 if (bmf
.pathname
[0]) {
305 if (strcmp(s
->bitmap_file
,"none")==0) {
306 if (ioctl(fd
, SET_BITMAP_FILE
, -1)!= 0) {
307 pr_err("failed to remove bitmap %s\n",
313 pr_err("%s already has a bitmap (%s)\n",
314 devname
, bmf
.pathname
);
317 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) != 0) {
318 pr_err("cannot get array status for %s\n", devname
);
321 if (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)) {
322 if (strcmp(s
->bitmap_file
, "none")==0) {
323 array
.state
&= ~(1<<MD_SB_BITMAP_PRESENT
);
324 if (ioctl(fd
, SET_ARRAY_INFO
, &array
)!= 0) {
325 pr_err("failed to remove internal bitmap.\n");
330 pr_err("Internal bitmap already present on %s\n",
335 if (strcmp(s
->bitmap_file
, "none") == 0) {
336 pr_err("no bitmap found on %s\n", devname
);
339 if (array
.level
<= 0) {
340 pr_err("Bitmaps not meaningful with level %s\n",
341 map_num(pers
, array
.level
)?:"of this array");
344 bitmapsize
= array
.size
;
346 if (get_dev_size(fd
, NULL
, &array_size
) &&
347 array_size
> (0x7fffffffULL
<<9)) {
348 /* Array is big enough that we cannot trust array.size
349 * try other approaches
351 bitmapsize
= get_component_size(fd
);
353 if (bitmapsize
== 0) {
354 pr_err("Cannot reliably determine size of array to create bitmap - sorry.\n");
358 if (array
.level
== 10) {
359 int ncopies
= (array
.layout
&255)*((array
.layout
>>8)&255);
360 bitmapsize
= bitmapsize
* array
.raid_disks
/ ncopies
;
363 st
= super_by_fd(fd
, &subarray
);
365 pr_err("Cannot understand version %d.%d\n",
366 array
.major_version
, array
.minor_version
);
370 pr_err("Cannot add bitmaps to sub-arrays yet\n");
375 if (strcmp(s
->bitmap_file
, "internal") == 0) {
378 int offset_setable
= 0;
380 if (st
->ss
->add_internal_bitmap
== NULL
) {
381 pr_err("Internal bitmaps not supported "
382 "with %s metadata\n", st
->ss
->name
);
385 mdi
= sysfs_read(fd
, -1, GET_BITMAP_LOCATION
);
388 for (d
=0; d
< st
->max_devs
; d
++) {
389 mdu_disk_info_t disk
;
392 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
394 if (disk
.major
== 0 &&
397 if ((disk
.state
& (1<<MD_DISK_SYNC
))==0)
399 dv
= map_dev(disk
.major
, disk
.minor
, 1);
401 int fd2
= dev_open(dv
, O_RDWR
);
404 if (st
->ss
->load_super(st
, fd2
, NULL
)==0) {
405 if (st
->ss
->add_internal_bitmap(
407 &s
->bitmap_chunk
, c
->delay
, s
->write_behind
,
408 bitmapsize
, offset_setable
,
411 st
->ss
->write_bitmap(st
, fd2
);
413 pr_err("failed to create internal bitmap"
414 " - chunksize problem.\n");
422 if (offset_setable
) {
423 st
->ss
->getinfo_super(st
, mdi
, NULL
);
424 sysfs_init(mdi
, fd
, -1);
425 rv
= sysfs_set_num_signed(mdi
, NULL
, "bitmap/location",
428 array
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
429 rv
= ioctl(fd
, SET_ARRAY_INFO
, &array
);
433 pr_err("Cannot add bitmap while array is"
434 " resyncing or reshaping etc.\n");
435 pr_err("failed to set internal bitmap.\n");
442 int max_devs
= st
->max_devs
;
444 /* try to load a superblock */
445 for (d
= 0; d
< max_devs
; d
++) {
446 mdu_disk_info_t disk
;
450 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
452 if ((disk
.major
==0 && disk
.minor
==0) ||
453 (disk
.state
& (1<<MD_DISK_REMOVED
)))
455 dv
= map_dev(disk
.major
, disk
.minor
, 1);
458 fd2
= dev_open(dv
, O_RDONLY
);
460 if (st
->ss
->load_super(st
, fd2
, NULL
) == 0) {
462 st
->ss
->uuid_from_super(st
, uuid
);
469 pr_err("cannot find UUID for array!\n");
472 if (CreateBitmap(s
->bitmap_file
, c
->force
, (char*)uuid
, s
->bitmap_chunk
,
473 c
->delay
, s
->write_behind
, bitmapsize
, major
)) {
476 bitmap_fd
= open(s
->bitmap_file
, O_RDWR
);
478 pr_err("weird: %s cannot be opened\n",
482 if (ioctl(fd
, SET_BITMAP_FILE
, bitmap_fd
) < 0) {
485 pr_err("Cannot add bitmap while array is"
486 " resyncing or reshaping etc.\n");
487 pr_err("Cannot set bitmap file for %s: %s\n",
488 devname
, strerror(err
));
497 * When reshaping an array we might need to backup some data.
498 * This is written to all spares with a 'super_block' describing it.
499 * The superblock goes 4K from the end of the used space on the
501 * It if written after the backup is complete.
502 * It has the following structure.
505 static struct mdp_backup_super
{
506 char magic
[16]; /* md_backup_data-1 or -2 */
509 /* start/sizes in 512byte sectors */
510 __u64 devstart
; /* address on backup device/file of data */
513 __u32 sb_csum
; /* csum of preceeding bytes. */
515 __u64 devstart2
; /* offset in to data of second section */
518 __u32 sb_csum2
; /* csum of preceeding bytes. */
520 } __attribute__((aligned(512))) bsb
, bsb2
;
522 static __u32
bsb_csum(char *buf
, int len
)
526 for (i
= 0; i
< len
; i
++)
527 csum
= (csum
<<3) + buf
[0];
528 return __cpu_to_le32(csum
);
531 static int check_idle(struct supertype
*st
)
533 /* Check that all member arrays for this container, or the
534 * container of this array, are idle
536 int container_dev
= (st
->container_dev
!= NoMdDev
537 ? st
->container_dev
: st
->devnum
);
539 struct mdstat_ent
*ent
, *e
;
542 fmt_devname(container
, container_dev
);
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 int container_dev
= (st
->container_dev
!= NoMdDev
559 ? st
->container_dev
: st
->devnum
);
565 fmt_devname(container
, container_dev
);
567 if (block_monitor(container
, 1)) {
568 pr_err("failed to freeze container\n");
575 static void unfreeze_container(struct supertype
*st
)
577 int container_dev
= (st
->container_dev
!= NoMdDev
578 ? st
->container_dev
: st
->devnum
);
581 fmt_devname(container
, container_dev
);
583 unblock_monitor(container
, 1);
586 static int freeze(struct supertype
*st
)
588 /* Try to freeze resync/rebuild on this array/container.
589 * Return -1 if the array is busy,
590 * return -2 container cannot be frozen,
591 * return 0 if this kernel doesn't support 'frozen'
592 * return 1 if it worked.
594 if (st
->ss
->external
)
595 return freeze_container(st
);
597 struct mdinfo
*sra
= sysfs_read(-1, st
->devnum
, GET_VERSION
);
603 /* Need to clear any 'read-auto' status */
604 if (sysfs_get_str(sra
, NULL
, "array_state", buf
, 20) > 0 &&
605 strncmp(buf
, "read-auto", 9) == 0)
606 sysfs_set_str(sra
, NULL
, "array_state", "clean");
608 err
= sysfs_freeze_array(sra
);
614 static void unfreeze(struct supertype
*st
)
616 if (st
->ss
->external
)
617 return unfreeze_container(st
);
619 struct mdinfo
*sra
= sysfs_read(-1, st
->devnum
, GET_VERSION
);
622 sysfs_set_str(sra
, NULL
, "sync_action", "idle");
627 static void wait_reshape(struct mdinfo
*sra
)
629 int fd
= sysfs_get_fd(sra
, NULL
, "sync_action");
635 while (sysfs_fd_get_str(fd
, action
, 20) > 0 &&
636 strncmp(action
, "reshape", 7) == 0) {
640 select(fd
+1, NULL
, NULL
, &rfds
, NULL
);
645 static int reshape_super(struct supertype
*st
, unsigned long long size
,
646 int level
, int layout
, int chunksize
, int raid_disks
,
647 int delta_disks
, char *backup_file
, char *dev
,
648 int direction
, int verbose
)
650 /* nothing extra to check in the native case */
651 if (!st
->ss
->external
)
653 if (!st
->ss
->reshape_super
||
654 !st
->ss
->manage_reshape
) {
655 pr_err("%s metadata does not support reshape\n",
660 return st
->ss
->reshape_super(st
, size
, level
, layout
, chunksize
,
661 raid_disks
, delta_disks
, backup_file
, dev
,
665 static void sync_metadata(struct supertype
*st
)
667 if (st
->ss
->external
) {
668 if (st
->update_tail
) {
669 flush_metadata_updates(st
);
670 st
->update_tail
= &st
->updates
;
672 st
->ss
->sync_metadata(st
);
676 static int subarray_set_num(char *container
, struct mdinfo
*sra
, char *name
, int n
)
678 /* when dealing with external metadata subarrays we need to be
679 * prepared to handle EAGAIN. The kernel may need to wait for
680 * mdmon to mark the array active so the kernel can handle
681 * allocations/writeback when preparing the reshape action
682 * (md_allow_write()). We temporarily disable safe_mode_delay
683 * to close a race with the array_state going clean before the
684 * next write to raid_disks / stripe_cache_size
689 /* only 'raid_disks' and 'stripe_cache_size' trigger md_allow_write */
691 (strcmp(name
, "raid_disks") != 0 &&
692 strcmp(name
, "stripe_cache_size") != 0))
693 return sysfs_set_num(sra
, NULL
, name
, n
);
695 rc
= sysfs_get_str(sra
, NULL
, "safe_mode_delay", safe
, sizeof(safe
));
698 sysfs_set_num(sra
, NULL
, "safe_mode_delay", 0);
699 rc
= sysfs_set_num(sra
, NULL
, name
, n
);
700 if (rc
< 0 && errno
== EAGAIN
) {
701 ping_monitor(container
);
702 /* if we get EAGAIN here then the monitor is not active
705 rc
= sysfs_set_num(sra
, NULL
, name
, n
);
707 sysfs_set_str(sra
, NULL
, "safe_mode_delay", safe
);
711 int start_reshape(struct mdinfo
*sra
, int already_running
,
712 int before_data_disks
, int data_disks
)
715 unsigned long long sync_max_to_set
;
717 sysfs_set_num(sra
, NULL
, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL
);
718 err
= sysfs_set_num(sra
, NULL
, "suspend_hi", sra
->reshape_progress
);
719 err
= err
?: sysfs_set_num(sra
, NULL
, "suspend_lo",
720 sra
->reshape_progress
);
721 if (before_data_disks
<= data_disks
)
722 sync_max_to_set
= sra
->reshape_progress
/ data_disks
;
724 sync_max_to_set
= (sra
->component_size
* data_disks
725 - sra
->reshape_progress
) / data_disks
;
726 if (!already_running
)
727 sysfs_set_num(sra
, NULL
, "sync_min", sync_max_to_set
);
728 err
= err
?: sysfs_set_num(sra
, NULL
, "sync_max", sync_max_to_set
);
729 if (!already_running
)
730 err
= err
?: sysfs_set_str(sra
, NULL
, "sync_action", "reshape");
735 void abort_reshape(struct mdinfo
*sra
)
737 sysfs_set_str(sra
, NULL
, "sync_action", "idle");
738 sysfs_set_num(sra
, NULL
, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL
);
739 sysfs_set_num(sra
, NULL
, "suspend_hi", 0);
740 sysfs_set_num(sra
, NULL
, "suspend_lo", 0);
741 sysfs_set_num(sra
, NULL
, "sync_min", 0);
742 sysfs_set_str(sra
, NULL
, "sync_max", "max");
745 int remove_disks_for_takeover(struct supertype
*st
,
750 struct mdinfo
*remaining
;
753 if (sra
->array
.level
== 10)
754 nr_of_copies
= layout
& 0xff;
755 else if (sra
->array
.level
== 1)
756 nr_of_copies
= sra
->array
.raid_disks
;
760 remaining
= sra
->devs
;
762 /* for each 'copy', select one device and remove from the list. */
763 for (slot
= 0; slot
< sra
->array
.raid_disks
; slot
+= nr_of_copies
) {
764 struct mdinfo
**diskp
;
767 /* Find a working device to keep */
768 for (diskp
= &remaining
; *diskp
; diskp
= &(*diskp
)->next
) {
769 struct mdinfo
*disk
= *diskp
;
771 if (disk
->disk
.raid_disk
< slot
)
773 if (disk
->disk
.raid_disk
>= slot
+ nr_of_copies
)
775 if (disk
->disk
.state
& (1<<MD_DISK_REMOVED
))
777 if (disk
->disk
.state
& (1<<MD_DISK_FAULTY
))
779 if (!(disk
->disk
.state
& (1<<MD_DISK_SYNC
)))
782 /* We have found a good disk to use! */
784 disk
->next
= sra
->devs
;
793 if (slot
< sra
->array
.raid_disks
) {
794 /* didn't find all slots */
800 sra
->devs
= remaining
;
804 /* Remove all 'remaining' devices from the array */
806 struct mdinfo
*sd
= remaining
;
807 remaining
= sd
->next
;
809 sysfs_set_str(sra
, sd
, "state", "faulty");
810 sysfs_set_str(sra
, sd
, "slot", "none");
811 /* for external metadata disks should be removed in mdmon */
812 if (!st
->ss
->external
)
813 sysfs_set_str(sra
, sd
, "state", "remove");
814 sd
->disk
.state
|= (1<<MD_DISK_REMOVED
);
815 sd
->disk
.state
&= ~(1<<MD_DISK_SYNC
);
816 sd
->next
= sra
->devs
;
822 void reshape_free_fdlist(int *fdlist
,
823 unsigned long long *offsets
,
828 for (i
= 0; i
< size
; i
++)
836 int reshape_prepare_fdlist(char *devname
,
840 unsigned long blocks
,
843 unsigned long long *offsets
)
848 for (d
= 0; d
<= nrdisks
; d
++)
851 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
852 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
854 if (sd
->disk
.state
& (1<<MD_DISK_SYNC
)) {
855 char *dn
= map_dev(sd
->disk
.major
,
857 fdlist
[sd
->disk
.raid_disk
]
858 = dev_open(dn
, O_RDONLY
);
859 offsets
[sd
->disk
.raid_disk
] = sd
->data_offset
*512;
860 if (fdlist
[sd
->disk
.raid_disk
] < 0) {
861 pr_err("%s: cannot open component %s\n",
862 devname
, dn
? dn
: "-unknown-");
866 } else if (backup_file
== NULL
) {
868 char *dn
= map_dev(sd
->disk
.major
,
870 fdlist
[d
] = dev_open(dn
, O_RDWR
);
871 offsets
[d
] = (sd
->data_offset
+ sra
->component_size
- blocks
- 8)*512;
873 pr_err("%s: cannot open component %s\n",
874 devname
, dn
? dn
: "-unknown-");
885 int reshape_open_backup_file(char *backup_file
,
890 unsigned long long *offsets
,
893 /* Return 1 on success, 0 on any form of failure */
894 /* need to check backup file is large enough */
900 *fdlist
= open(backup_file
, O_RDWR
|O_CREAT
|(restart
? O_TRUNC
: O_EXCL
),
904 pr_err("%s: cannot create backup file %s: %s\n",
905 devname
, backup_file
, strerror(errno
));
908 /* Guard against backup file being on array device.
909 * If array is partitioned or if LVM etc is in the
910 * way this will not notice, but it is better than
913 fstat(*fdlist
, &stb
);
916 if (stb
.st_rdev
== dev
) {
917 pr_err("backup file must NOT be"
918 " on the array being reshaped.\n");
924 for (i
=0; i
< blocks
+ 8 ; i
++) {
925 if (write(*fdlist
, buf
, 512) != 512) {
926 pr_err("%s: cannot create"
927 " backup file %s: %s\n",
928 devname
, backup_file
, strerror(errno
));
932 if (fsync(*fdlist
) != 0) {
933 pr_err("%s: cannot create backup file %s: %s\n",
934 devname
, backup_file
, strerror(errno
));
941 unsigned long GCD(unsigned long a
, unsigned long b
)
952 unsigned long compute_backup_blocks(int nchunk
, int ochunk
,
953 unsigned int ndata
, unsigned int odata
)
955 unsigned long a
, b
, blocks
;
956 /* So how much do we need to backup.
957 * We need an amount of data which is both a whole number of
958 * old stripes and a whole number of new stripes.
959 * So LCM for (chunksize*datadisks).
961 a
= (ochunk
/512) * odata
;
962 b
= (nchunk
/512) * ndata
;
965 /* LCM == product / GCD */
966 blocks
= (ochunk
/512) * (nchunk
/512) * odata
* ndata
/ a
;
971 char *analyse_change(struct mdinfo
*info
, struct reshape
*re
)
973 /* Based on the current array state in info->array and
974 * the changes in info->new_* etc, determine:
975 * - whether the change is possible
976 * - Intermediate level/raid_disks/layout
977 * - whether a restriping reshape is needed
978 * - number of sectors in minimum change unit. This
979 * will cover a whole number of stripes in 'before' and
982 * Return message if the change should be rejected
983 * NULL if the change can be achieved
985 * This can be called as part of starting a reshape, or
986 * when assembling an array that is undergoing reshape.
988 int near
, far
, offset
, copies
;
990 int old_chunk
, new_chunk
;
991 /* delta_parity records change in number of devices
992 * caused by level change
994 int delta_parity
= 0;
996 /* If a new level not explicitly given, we assume no-change */
997 if (info
->new_level
== UnSet
)
998 info
->new_level
= info
->array
.level
;
1000 if (info
->new_chunk
)
1001 switch (info
->new_level
) {
1007 /* chunk size is meaningful, must divide component_size
1010 if (info
->component_size
% (info
->new_chunk
/512))
1011 return "New chunk size does not"
1012 " divide component size";
1015 return "chunk size not meaningful for this level";
1018 info
->new_chunk
= info
->array
.chunk_size
;
1020 switch (info
->array
.level
) {
1022 return "Cannot understand this RAID level";
1024 /* RAID1 can convert to RAID1 with different disks, or
1025 * raid5 with 2 disks, or
1028 if (info
->new_level
> 1 &&
1029 (info
->component_size
& 7))
1030 return "Cannot convert RAID1 of this size - "
1031 "reduce size to multiple of 4K first.";
1032 if (info
->new_level
== 0) {
1033 if (info
->delta_disks
!= UnSet
&&
1034 info
->delta_disks
!= 0)
1035 return "Cannot change number of disks "
1036 "with RAID1->RAID0 conversion";
1038 re
->before
.data_disks
= 1;
1039 re
->after
.data_disks
= 1;
1040 re
->before
.layout
= 0;
1041 re
->backup_blocks
= 0;
1045 if (info
->new_level
== 1) {
1046 if (info
->delta_disks
== UnSet
)
1047 /* Don't know what to do */
1048 return "no change requested for Growing RAID1";
1050 re
->backup_blocks
= 0;
1054 if (info
->array
.raid_disks
== 2 &&
1055 info
->new_level
== 5) {
1058 re
->before
.data_disks
= 1;
1059 if (info
->delta_disks
!= UnSet
&&
1060 info
->delta_disks
!= 0)
1061 re
->after
.data_disks
= 1 + info
->delta_disks
;
1063 re
->after
.data_disks
= 1;
1064 if (re
->after
.data_disks
< 1)
1065 return "Number of disks too small for RAID5";
1067 re
->before
.layout
= ALGORITHM_LEFT_SYMMETRIC
;
1068 info
->array
.chunk_size
= 65536;
1071 /* Could do some multi-stage conversions, but leave that to
1074 return "Impossibly level change request for RAID1";
1077 /* RAID10 can be converted from near mode to
1078 * RAID0 by removing some devices.
1079 * It can also be reshaped if the kernel supports
1082 switch (info
->new_level
) {
1084 if ((info
->array
.layout
& ~0xff) != 0x100)
1085 return "Cannot Grow RAID10 with far/offset layout";
1086 /* number of devices must be multiple of number of copies */
1087 if (info
->array
.raid_disks
% (info
->array
.layout
& 0xff))
1088 return "RAID10 layout too complex for Grow operation";
1090 new_disks
= (info
->array
.raid_disks
1091 / (info
->array
.layout
& 0xff));
1092 if (info
->delta_disks
== UnSet
)
1093 info
->delta_disks
= (new_disks
1094 - info
->array
.raid_disks
);
1096 if (info
->delta_disks
!= new_disks
- info
->array
.raid_disks
)
1097 return "New number of raid-devices impossible for RAID10";
1098 if (info
->new_chunk
&&
1099 info
->new_chunk
!= info
->array
.chunk_size
)
1100 return "Cannot change chunk-size with RAID10 Grow";
1105 re
->before
.data_disks
= new_disks
;
1106 re
->after
.data_disks
= re
->before
.data_disks
;
1107 re
->before
.layout
= 0;
1108 re
->backup_blocks
= 0;
1112 near
= info
->array
.layout
& 0xff;
1113 far
= (info
->array
.layout
>> 8) & 0xff;
1114 offset
= info
->array
.layout
& 0x10000;
1115 if (far
> 1 && !offset
)
1116 return "Cannot reshape RAID10 in far-mode";
1117 copies
= near
* far
;
1119 old_chunk
= info
->array
.chunk_size
* far
;
1121 if (info
->new_layout
== UnSet
)
1122 info
->new_layout
= info
->array
.layout
;
1124 near
= info
->new_layout
& 0xff;
1125 far
= (info
->new_layout
>> 8) & 0xff;
1126 offset
= info
->new_layout
& 0x10000;
1127 if (far
> 1 && !offset
)
1128 return "Cannot reshape RAID10 to far-mode";
1129 if (near
* far
!= copies
)
1130 return "Cannot change number of copies"
1131 " when reshaping RAID10";
1133 if (info
->delta_disks
== UnSet
)
1134 info
->delta_disks
= 0;
1135 new_disks
= (info
->array
.raid_disks
+
1138 new_chunk
= info
->new_chunk
* far
;
1142 re
->before
.layout
= info
->array
.layout
;
1143 re
->before
.data_disks
= info
->array
.raid_disks
;
1144 re
->after
.layout
= info
->new_layout
;
1145 re
->after
.data_disks
= new_disks
;
1146 /* For RAID10 we don't do backup, and there is
1147 * no need to synchronise stripes on both
1148 * 'old' and 'new'. So the important
1149 * number is the minimum data_offset difference
1150 * which is the larger of (offset copies * chunk).
1153 re
->backup_blocks
= max(old_chunk
, new_chunk
) / 512;
1154 if (new_disks
< re
->before
.data_disks
&&
1155 info
->space_after
< re
->backup_blocks
)
1156 /* Reduce component size by one chunk */
1157 re
->new_size
= (info
->component_size
-
1160 re
->new_size
= info
->component_size
;
1161 re
->new_size
= re
->new_size
* new_disks
/ copies
;
1165 return "RAID10 can only be changed to RAID0";
1168 /* RAID0 can be converted to RAID10, or to RAID456 */
1169 if (info
->new_level
== 10) {
1170 if (info
->new_layout
== UnSet
&& info
->delta_disks
== UnSet
) {
1171 /* Assume near=2 layout */
1172 info
->new_layout
= 0x102;
1173 info
->delta_disks
= info
->array
.raid_disks
;
1175 if (info
->new_layout
== UnSet
) {
1176 int copies
= 1 + (info
->delta_disks
1177 / info
->array
.raid_disks
);
1178 if (info
->array
.raid_disks
* (copies
-1)
1179 != info
->delta_disks
)
1180 return "Impossible number of devices"
1181 " for RAID0->RAID10";
1182 info
->new_layout
= 0x100 + copies
;
1184 if (info
->delta_disks
== UnSet
) {
1185 int copies
= info
->new_layout
& 0xff;
1186 if (info
->new_layout
!= 0x100 + copies
)
1187 return "New layout impossible"
1188 " for RAID0->RAID10";;
1189 info
->delta_disks
= (copies
- 1) *
1190 info
->array
.raid_disks
;
1192 if (info
->new_chunk
&&
1193 info
->new_chunk
!= info
->array
.chunk_size
)
1194 return "Cannot change chunk-size with RAID0->RAID10";
1198 re
->before
.data_disks
= (info
->array
.raid_disks
+
1200 re
->after
.data_disks
= re
->before
.data_disks
;
1201 re
->before
.layout
= info
->new_layout
;
1202 re
->backup_blocks
= 0;
1206 /* RAID0 can also covert to RAID0/4/5/6 by first converting to
1207 * a raid4 style layout of the final level.
1209 switch (info
->new_level
) {
1214 re
->before
.layout
= 0;
1219 re
->before
.layout
= ALGORITHM_PARITY_N
;
1224 re
->before
.layout
= ALGORITHM_PARITY_N
;
1227 return "Impossible level change requested";
1229 re
->before
.data_disks
= info
->array
.raid_disks
;
1230 /* determining 'after' layout happens outside this 'switch' */
1234 info
->array
.layout
= ALGORITHM_PARITY_N
;
1236 switch (info
->new_level
) {
1240 re
->level
= info
->array
.level
;
1241 re
->before
.data_disks
= info
->array
.raid_disks
- 1;
1242 re
->before
.layout
= info
->array
.layout
;
1246 re
->before
.data_disks
= info
->array
.raid_disks
- 1;
1247 re
->before
.layout
= info
->array
.layout
;
1252 re
->before
.data_disks
= info
->array
.raid_disks
- 1;
1253 switch (info
->array
.layout
) {
1254 case ALGORITHM_LEFT_ASYMMETRIC
:
1255 re
->before
.layout
= ALGORITHM_LEFT_ASYMMETRIC_6
;
1257 case ALGORITHM_RIGHT_ASYMMETRIC
:
1258 re
->before
.layout
= ALGORITHM_RIGHT_ASYMMETRIC_6
;
1260 case ALGORITHM_LEFT_SYMMETRIC
:
1261 re
->before
.layout
= ALGORITHM_LEFT_SYMMETRIC_6
;
1263 case ALGORITHM_RIGHT_SYMMETRIC
:
1264 re
->before
.layout
= ALGORITHM_RIGHT_SYMMETRIC_6
;
1266 case ALGORITHM_PARITY_0
:
1267 re
->before
.layout
= ALGORITHM_PARITY_0_6
;
1269 case ALGORITHM_PARITY_N
:
1270 re
->before
.layout
= ALGORITHM_PARITY_N_6
;
1273 return "Cannot convert an array with this layout";
1277 if (info
->array
.raid_disks
!= 2)
1278 return "Can only convert a 2-device array to RAID1";
1279 if (info
->delta_disks
!= UnSet
&&
1280 info
->delta_disks
!= 0)
1281 return "Cannot set raid_disk when "
1282 "converting RAID5->RAID1";
1284 re
->backup_blocks
= 0;
1285 info
->new_chunk
= 0;
1288 return "Impossible level change requested";
1292 switch (info
->new_level
) {
1298 re
->before
.data_disks
= info
->array
.raid_disks
- 2;
1299 re
->before
.layout
= info
->array
.layout
;
1302 return "Impossible level change requested";
1307 /* If we reached here then it looks like a re-stripe is
1308 * happening. We have determined the intermediate level
1309 * and initial raid_disks/layout and stored these in 're'.
1311 * We need to deduce the final layout that can be atomically
1312 * converted to the end state.
1314 switch (info
->new_level
) {
1316 /* We can only get to RAID0 from RAID4 or RAID5
1317 * with appropriate layout and one extra device
1319 if (re
->level
!= 4 && re
->level
!= 5)
1320 return "Cannot covert to RAID0 from this level";
1322 switch (re
->level
) {
1324 re
->after
.layout
= 0;
1327 re
->after
.layout
= ALGORITHM_PARITY_N
;
1333 /* We can only get to RAID4 from RAID5 */
1334 if (re
->level
!= 4 && re
->level
!= 5)
1335 return "Cannot convert to RAID4 from this level";
1337 switch (re
->level
) {
1339 re
->after
.layout
= 0;
1342 re
->after
.layout
= ALGORITHM_PARITY_N
;
1348 /* We get to RAID5 from RAID5 or RAID6 */
1349 if (re
->level
!= 5 && re
->level
!= 6)
1350 return "Cannot convert to RAID5 from this level";
1352 switch (re
->level
) {
1354 if (info
->new_layout
== UnSet
)
1355 re
->after
.layout
= re
->before
.layout
;
1357 re
->after
.layout
= info
->new_layout
;
1360 if (info
->new_layout
== UnSet
)
1361 info
->new_layout
= re
->before
.layout
;
1363 /* after.layout needs to be raid6 version of new_layout */
1364 if (info
->new_layout
== ALGORITHM_PARITY_N
)
1365 re
->after
.layout
= ALGORITHM_PARITY_N
;
1368 char *ls
= map_num(r5layout
, info
->new_layout
);
1371 /* Current RAID6 layout has a RAID5
1374 strcat(strcpy(layout
, ls
), "-6");
1375 l
= map_name(r6layout
, layout
);
1377 return "Cannot find RAID6 layout"
1380 /* Current RAID6 has no equivalent.
1381 * If it is already a '-6' layout we
1382 * can leave it unchanged, else we must
1385 ls
= map_num(r6layout
, info
->new_layout
);
1387 strcmp(ls
+strlen(ls
)-2, "-6") != 0)
1388 return "Please specify new layout";
1389 l
= info
->new_layout
;
1391 re
->after
.layout
= l
;
1397 /* We must already be at level 6 */
1399 return "Impossible level change";
1400 if (info
->new_layout
== UnSet
)
1401 re
->after
.layout
= info
->array
.layout
;
1403 re
->after
.layout
= info
->new_layout
;
1406 return "Impossible level change requested";
1408 if (info
->delta_disks
== UnSet
)
1409 info
->delta_disks
= delta_parity
;
1411 re
->after
.data_disks
= (re
->before
.data_disks
1414 switch (re
->level
) {
1415 case 6: re
->parity
= 2;
1418 case 5: re
->parity
= 1;
1420 default: re
->parity
= 0;
1423 /* So we have a restripe operation, we need to calculate the number
1424 * of blocks per reshape operation.
1426 if (info
->new_chunk
== 0)
1427 info
->new_chunk
= info
->array
.chunk_size
;
1428 if (re
->after
.data_disks
== re
->before
.data_disks
&&
1429 re
->after
.layout
== re
->before
.layout
&&
1430 info
->new_chunk
== info
->array
.chunk_size
) {
1431 /* Nothing to change */
1432 re
->backup_blocks
= 0;
1435 if (re
->after
.data_disks
== 1 && re
->before
.data_disks
== 1) {
1436 /* chunk and layout changes make no difference */
1437 re
->backup_blocks
= 0;
1441 if (re
->after
.data_disks
== re
->before
.data_disks
&&
1442 get_linux_version() < 2006032)
1443 return "in-place reshape is not safe before 2.6.32 - sorry.";
1445 if (re
->after
.data_disks
< re
->before
.data_disks
&&
1446 get_linux_version() < 2006030)
1447 return "reshape to fewer devices is not supported before 2.6.30 - sorry.";
1449 re
->backup_blocks
= compute_backup_blocks(
1450 info
->new_chunk
, info
->array
.chunk_size
,
1451 re
->after
.data_disks
,
1452 re
->before
.data_disks
);
1454 re
->new_size
= info
->component_size
* re
->after
.data_disks
;
1458 static int set_array_size(struct supertype
*st
, struct mdinfo
*sra
,
1461 struct mdinfo
*info
;
1465 if ((st
== NULL
) || (sra
== NULL
))
1468 if (text_version
== NULL
)
1469 text_version
= sra
->text_version
;
1470 subarray
= strchr(text_version
+1, '/')+1;
1471 info
= st
->ss
->container_content(st
, subarray
);
1473 unsigned long long current_size
= 0;
1474 unsigned long long new_size
=
1475 info
->custom_array_size
/2;
1477 if (sysfs_get_ll(sra
, NULL
, "array_size", ¤t_size
) == 0 &&
1478 new_size
> current_size
) {
1479 if (sysfs_set_num(sra
, NULL
, "array_size", new_size
)
1481 dprintf("Error: Cannot set array size");
1484 dprintf("Array size changed");
1486 dprintf(" from %llu to %llu.\n",
1487 current_size
, new_size
);
1491 dprintf("Error: set_array_size(): info pointer in NULL\n");
1496 static int reshape_array(char *container
, int fd
, char *devname
,
1497 struct supertype
*st
, struct mdinfo
*info
,
1498 int force
, struct mddev_dev
*devlist
,
1499 unsigned long long data_offset
,
1500 char *backup_file
, int verbose
, int forked
,
1501 int restart
, int freeze_reshape
);
1502 static int reshape_container(char *container
, char *devname
,
1504 struct supertype
*st
,
1505 struct mdinfo
*info
,
1508 int verbose
, int restart
, int freeze_reshape
);
1510 int Grow_reshape(char *devname
, int fd
,
1511 struct mddev_dev
*devlist
,
1512 unsigned long long data_offset
,
1513 struct context
*c
, struct shape
*s
)
1515 /* Make some changes in the shape of an array.
1516 * The kernel must support the change.
1518 * There are three different changes. Each can trigger
1519 * a resync or recovery so we freeze that until we have
1520 * requested everything (if kernel supports freezing - 2.6.30).
1522 * - change size (i.e. component_size)
1524 * - change layout/chunksize/ndisks
1526 * The last can require a reshape. It is different on different
1527 * levels so we need to check the level before actioning it.
1528 * Some times the level change needs to be requested after the
1529 * reshape (e.g. raid6->raid5, raid5->raid0)
1532 struct mdu_array_info_s array
;
1534 struct supertype
*st
;
1535 char *subarray
= NULL
;
1539 char *container
= NULL
;
1540 char container_buf
[20];
1543 struct mddev_dev
*dv
;
1550 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) < 0) {
1551 fprintf(stderr
, Name
": %s is not an active md array - aborting\n",
1555 if (data_offset
!= INVALID_SECTORS
&& array
.level
!= 10) {
1556 pr_err("--grow --data-offset not yet supported\n");
1561 (s
->chunk
|| s
->level
!= UnSet
|| s
->layout_str
|| s
->raiddisks
)) {
1562 pr_err("cannot change component size at the same time "
1563 "as other changes.\n"
1564 " Change size first, then check data is intact before "
1565 "making other changes.\n");
1569 if (s
->raiddisks
&& s
->raiddisks
< array
.raid_disks
&& array
.level
> 1 &&
1570 get_linux_version() < 2006032 &&
1571 !check_env("MDADM_FORCE_FEWER")) {
1572 pr_err("reducing the number of devices is not safe before Linux 2.6.32\n"
1573 " Please use a newer kernel\n");
1577 st
= super_by_fd(fd
, &subarray
);
1579 pr_err("Unable to determine metadata format for %s\n", devname
);
1582 if (s
->raiddisks
> st
->max_devs
) {
1583 pr_err("Cannot increase raid-disks on this array"
1584 " beyond %d\n", st
->max_devs
);
1588 /* in the external case we need to check that the requested reshape is
1589 * supported, and perform an initial check that the container holds the
1590 * pre-requisite spare devices (mdmon owns final validation)
1592 if (st
->ss
->external
) {
1597 container_dev
= st
->container_dev
;
1598 cfd
= open_dev_excl(st
->container_dev
);
1600 container_dev
= st
->devnum
;
1602 cfd
= open_dev_excl(st
->devnum
);
1606 pr_err("Unable to open container for %s\n",
1612 fmt_devname(container_buf
, container_dev
);
1613 container
= container_buf
;
1615 rv
= st
->ss
->load_container(st
, cfd
, NULL
);
1618 pr_err("Cannot read superblock for %s\n",
1624 /* check if operation is supported for metadata handler */
1625 if (st
->ss
->container_content
) {
1626 struct mdinfo
*cc
= NULL
;
1627 struct mdinfo
*content
= NULL
;
1629 cc
= st
->ss
->container_content(st
, subarray
);
1630 for (content
= cc
; content
; content
= content
->next
) {
1631 int allow_reshape
= 1;
1633 /* check if reshape is allowed based on metadata
1634 * indications stored in content.array.status
1636 if (content
->array
.state
& (1<<MD_SB_BLOCK_VOLUME
))
1638 if (content
->array
.state
1639 & (1<<MD_SB_BLOCK_CONTAINER_RESHAPE
))
1641 if (!allow_reshape
) {
1642 pr_err("cannot reshape arrays in"
1643 " container with unsupported"
1644 " metadata: %s(%s)\n",
1645 devname
, container_buf
);
1653 if (mdmon_running(container_dev
))
1654 st
->update_tail
= &st
->updates
;
1658 for (dv
= devlist
; dv
; dv
= dv
->next
)
1660 if (s
->raiddisks
> array
.raid_disks
&&
1661 array
.spare_disks
+added_disks
< (s
->raiddisks
- array
.raid_disks
) &&
1663 pr_err("Need %d spare%s to avoid degraded array,"
1664 " and only have %d.\n"
1665 " Use --force to over-ride this check.\n",
1666 s
->raiddisks
- array
.raid_disks
,
1667 s
->raiddisks
- array
.raid_disks
== 1 ? "" : "s",
1668 array
.spare_disks
+ added_disks
);
1672 sra
= sysfs_read(fd
, 0, GET_LEVEL
| GET_DISKS
| GET_DEVS
1673 | GET_STATE
| GET_VERSION
);
1675 if (st
->ss
->external
&& subarray
== NULL
) {
1676 array
.level
= LEVEL_CONTAINER
;
1677 sra
->array
.level
= LEVEL_CONTAINER
;
1680 pr_err("failed to read sysfs parameters for %s\n",
1684 frozen
= freeze(st
);
1686 /* freeze() already spewed the reason */
1689 } else if (frozen
< 0) {
1690 pr_err("%s is performing resync/recovery and cannot"
1691 " be reshaped\n", devname
);
1696 /* ========= set size =============== */
1697 if (s
->size
> 0 && (s
->size
== MAX_SIZE
|| s
->size
!= (unsigned)array
.size
)) {
1698 unsigned long long orig_size
= get_component_size(fd
)/2;
1699 unsigned long long min_csize
;
1701 int raid0_takeover
= 0;
1704 orig_size
= (unsigned) array
.size
;
1706 if (reshape_super(st
, s
->size
, UnSet
, UnSet
, 0, 0, UnSet
, NULL
,
1707 devname
, APPLY_METADATA_CHANGES
, c
->verbose
> 0)) {
1712 if (st
->ss
->external
) {
1713 /* metadata can have size limitation
1714 * update size value according to metadata information
1716 struct mdinfo
*sizeinfo
=
1717 st
->ss
->container_content(st
, subarray
);
1719 unsigned long long new_size
=
1720 sizeinfo
->custom_array_size
/2;
1721 int data_disks
= get_data_disks(
1722 sizeinfo
->array
.level
,
1723 sizeinfo
->array
.layout
,
1724 sizeinfo
->array
.raid_disks
);
1725 new_size
/= data_disks
;
1726 dprintf("Metadata size correction from %llu to "
1727 "%llu (%llu)\n", orig_size
, new_size
,
1728 new_size
* data_disks
);
1730 sysfs_free(sizeinfo
);
1734 /* Update the size of each member device in case
1735 * they have been resized. This will never reduce
1736 * below the current used-size. The "size" attribute
1737 * understands '0' to mean 'max'.
1741 for (mdi
= sra
->devs
; mdi
; mdi
= mdi
->next
) {
1742 if (sysfs_set_num(sra
, mdi
, "size",
1743 s
->size
== MAX_SIZE
? 0 : s
->size
) < 0) {
1744 /* Probably kernel refusing to let us
1745 * reduce the size - not an error.
1749 if (array
.not_persistent
== 0 &&
1750 array
.major_version
== 0 &&
1751 get_linux_version() < 3001000) {
1752 /* Dangerous to allow size to exceed 2TB */
1753 unsigned long long csize
;
1754 if (sysfs_get_ll(sra
, mdi
, "size", &csize
) == 0) {
1755 if (csize
>= 2ULL*1024*1024*1024)
1756 csize
= 2ULL*1024*1024*1024;
1757 if ((min_csize
== 0 || (min_csize
1764 pr_err("Cannot set size on "
1765 "array members.\n");
1766 goto size_change_error
;
1768 if (min_csize
&& s
->size
> min_csize
) {
1769 pr_err("Cannot safely make this array "
1770 "use more than 2TB per device on this kernel.\n");
1772 goto size_change_error
;
1774 if (min_csize
&& s
->size
== MAX_SIZE
) {
1775 /* Don't let the kernel choose a size - it will get
1778 pr_err("Limited v0.90 array to "
1779 "2TB per device\n");
1780 s
->size
= min_csize
;
1782 if (st
->ss
->external
) {
1783 if (sra
->array
.level
== 0) {
1784 rv
= sysfs_set_str(sra
, NULL
, "level",
1788 /* get array parametes after takeover
1789 * to chane one parameter at time only
1791 rv
= ioctl(fd
, GET_ARRAY_INFO
, &array
);
1794 /* make sure mdmon is
1795 * aware of the new level */
1796 if (!mdmon_running(st
->container_dev
))
1797 start_mdmon(st
->container_dev
);
1798 ping_monitor(container
);
1799 if (mdmon_running(st
->container_dev
) &&
1800 st
->update_tail
== NULL
)
1801 st
->update_tail
= &st
->updates
;
1804 if (s
->size
== MAX_SIZE
)
1806 array
.size
= s
->size
;
1807 if ((unsigned)array
.size
!= s
->size
) {
1808 /* got truncated to 32bit, write to
1809 * component_size instead
1812 rv
= sysfs_set_num(sra
, NULL
,
1813 "component_size", s
->size
);
1817 rv
= ioctl(fd
, SET_ARRAY_INFO
, &array
);
1819 /* manage array size when it is managed externally
1821 if ((rv
== 0) && st
->ss
->external
)
1822 rv
= set_array_size(st
, sra
, sra
->text_version
);
1825 if (raid0_takeover
) {
1826 /* do not recync non-existing parity,
1827 * we will drop it anyway
1829 sysfs_set_str(sra
, NULL
, "sync_action", "frozen");
1830 /* go back to raid0, drop parity disk
1832 sysfs_set_str(sra
, NULL
, "level", "raid0");
1833 ioctl(fd
, GET_ARRAY_INFO
, &array
);
1840 /* restore metadata */
1841 if (reshape_super(st
, orig_size
, UnSet
, UnSet
, 0, 0,
1842 UnSet
, NULL
, devname
,
1843 ROLLBACK_METADATA_CHANGES
,
1846 pr_err("Cannot set device size for %s: %s\n",
1847 devname
, strerror(err
));
1849 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
1850 cont_err("Bitmap must be removed before size can be changed\n");
1854 if (s
->assume_clean
) {
1855 /* This will fail on kernels older than 3.0 unless
1856 * a backport has been arranged.
1859 sysfs_set_str(sra
, NULL
, "resync_start", "none") < 0)
1860 pr_err("--assume-clean not supported with --grow on this kernel\n");
1862 ioctl(fd
, GET_ARRAY_INFO
, &array
);
1863 s
->size
= get_component_size(fd
)/2;
1865 s
->size
= array
.size
;
1866 if (c
->verbose
>= 0) {
1867 if (s
->size
== orig_size
)
1868 pr_err("component size of %s "
1869 "unchanged at %lluK\n",
1872 pr_err("component size of %s "
1873 "has been set to %lluK\n",
1877 } else if (array
.level
!= LEVEL_CONTAINER
) {
1878 s
->size
= get_component_size(fd
)/2;
1880 s
->size
= array
.size
;
1883 /* See if there is anything else to do */
1884 if ((s
->level
== UnSet
|| s
->level
== array
.level
) &&
1885 (s
->layout_str
== NULL
) &&
1886 (s
->chunk
== 0 || s
->chunk
== array
.chunk_size
) &&
1887 (s
->raiddisks
== 0 || s
->raiddisks
== array
.raid_disks
)) {
1888 /* Nothing more to do */
1889 if (!changed
&& c
->verbose
>= 0)
1890 pr_err("%s: no change requested\n",
1895 /* ========= check for Raid10/Raid1 -> Raid0 conversion ===============
1896 * current implementation assumes that following conditions must be met:
1899 * - near_copies == 2
1901 if ((s
->level
== 0 && array
.level
== 10 && sra
&&
1902 array
.layout
== ((1 << 8) + 2) && !(array
.raid_disks
& 1)) ||
1903 (s
->level
== 0 && array
.level
== 1 && sra
)) {
1905 err
= remove_disks_for_takeover(st
, sra
, array
.layout
);
1907 dprintf(Name
": Array cannot be reshaped\n");
1913 /* Make sure mdmon has seen the device removal
1914 * and updated metadata before we continue with
1918 ping_monitor(container
);
1921 memset(&info
, 0, sizeof(info
));
1923 sysfs_init(&info
, fd
, NoMdDev
);
1924 strcpy(info
.text_version
, sra
->text_version
);
1925 info
.component_size
= s
->size
*2;
1926 info
.new_level
= s
->level
;
1927 info
.new_chunk
= s
->chunk
* 1024;
1928 if (info
.array
.level
== LEVEL_CONTAINER
) {
1929 info
.delta_disks
= UnSet
;
1930 info
.array
.raid_disks
= s
->raiddisks
;
1931 } else if (s
->raiddisks
)
1932 info
.delta_disks
= s
->raiddisks
- info
.array
.raid_disks
;
1934 info
.delta_disks
= UnSet
;
1935 if (s
->layout_str
== NULL
) {
1936 info
.new_layout
= UnSet
;
1937 if (info
.array
.level
== 6 &&
1938 (info
.new_level
== 6 || info
.new_level
== UnSet
) &&
1939 info
.array
.layout
>= 16) {
1940 pr_err("%s has a non-standard layout. If you"
1941 " wish to preserve this\n", devname
);
1942 cont_err("during the reshape, please specify"
1943 " --layout=preserve\n");
1944 cont_err("If you want to change it, specify a"
1945 " layout or use --layout=normalise\n");
1949 } else if (strcmp(s
->layout_str
, "normalise") == 0 ||
1950 strcmp(s
->layout_str
, "normalize") == 0) {
1951 /* If we have a -6 RAID6 layout, remove the '-6'. */
1952 info
.new_layout
= UnSet
;
1953 if (info
.array
.level
== 6 && info
.new_level
== UnSet
) {
1955 strcpy(l
, map_num(r6layout
, info
.array
.layout
));
1956 h
= strrchr(l
, '-');
1957 if (h
&& strcmp(h
, "-6") == 0) {
1959 info
.new_layout
= map_name(r6layout
, l
);
1962 pr_err("%s is only meaningful when reshaping"
1963 " a RAID6 array.\n", s
->layout_str
);
1967 } else if (strcmp(s
->layout_str
, "preserve") == 0) {
1968 /* This means that a non-standard RAID6 layout
1971 * - When reshape a RAID6 (e.g. adding a device)
1972 * which is in a non-standard layout, it is OK
1973 * to preserve that layout.
1974 * - When converting a RAID5 to RAID6, leave it in
1975 * the XXX-6 layout, don't re-layout.
1977 if (info
.array
.level
== 6 && info
.new_level
== UnSet
)
1978 info
.new_layout
= info
.array
.layout
;
1979 else if (info
.array
.level
== 5 && info
.new_level
== 6) {
1981 strcpy(l
, map_num(r5layout
, info
.array
.layout
));
1983 info
.new_layout
= map_name(r6layout
, l
);
1985 pr_err("%s in only meaningful when reshaping"
1986 " to RAID6\n", s
->layout_str
);
1991 int l
= info
.new_level
;
1993 l
= info
.array
.level
;
1996 info
.new_layout
= map_name(r5layout
, s
->layout_str
);
1999 info
.new_layout
= map_name(r6layout
, s
->layout_str
);
2002 info
.new_layout
= parse_layout_10(s
->layout_str
);
2005 info
.new_layout
= parse_layout_faulty(s
->layout_str
);
2008 pr_err("layout not meaningful"
2009 " with this level\n");
2013 if (info
.new_layout
== UnSet
) {
2014 pr_err("layout %s not understood"
2015 " for this level\n",
2022 if (array
.level
== LEVEL_FAULTY
) {
2023 if (s
->level
!= UnSet
&& s
->level
!= array
.level
) {
2024 pr_err("cannot change level of Faulty device\n");
2028 pr_err("cannot set chunksize of Faulty device\n");
2031 if (s
->raiddisks
&& s
->raiddisks
!= 1) {
2032 pr_err("cannot set raid_disks of Faulty device\n");
2035 if (s
->layout_str
) {
2036 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) != 0) {
2037 dprintf("Cannot get array information.\n");
2040 array
.layout
= info
.new_layout
;
2041 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
2042 pr_err("failed to set new layout\n");
2044 } else if (c
->verbose
>= 0)
2045 printf("layout for %s set to %d\n",
2046 devname
, array
.layout
);
2048 } else if (array
.level
== LEVEL_CONTAINER
) {
2049 /* This change is to be applied to every array in the
2050 * container. This is only needed when the metadata imposes
2051 * restraints of the various arrays in the container.
2052 * Currently we only know that IMSM requires all arrays
2053 * to have the same number of devices so changing the
2054 * number of devices (On-Line Capacity Expansion) must be
2055 * performed at the level of the container
2057 rv
= reshape_container(container
, devname
, -1, st
, &info
,
2058 c
->force
, c
->backup_file
, c
->verbose
, 0, 0);
2061 /* get spare devices from external metadata
2063 if (st
->ss
->external
) {
2064 struct mdinfo
*info2
;
2066 info2
= st
->ss
->container_content(st
, subarray
);
2068 info
.array
.spare_disks
=
2069 info2
->array
.spare_disks
;
2074 /* Impose these changes on a single array. First
2075 * check that the metadata is OK with the change. */
2077 if (reshape_super(st
, 0, info
.new_level
,
2078 info
.new_layout
, info
.new_chunk
,
2079 info
.array
.raid_disks
, info
.delta_disks
,
2080 c
->backup_file
, devname
, APPLY_METADATA_CHANGES
,
2086 rv
= reshape_array(container
, fd
, devname
, st
, &info
, c
->force
,
2087 devlist
, data_offset
, c
->backup_file
, c
->verbose
,
2098 /* verify_reshape_position()
2099 * Function checks if reshape position in metadata is not farther
2100 * than position in md.
2102 * 0 : not valid sysfs entry
2103 * it can be caused by not started reshape, it should be started
2104 * by reshape array or raid0 array is before takeover
2105 * -1 : error, reshape position is obviously wrong
2106 * 1 : success, reshape progress correct or updated
2108 static int verify_reshape_position(struct mdinfo
*info
, int level
)
2114 /* read sync_max, failure can mean raid0 array */
2115 rv
= sysfs_get_str(info
, NULL
, "sync_max", buf
, 40);
2119 unsigned long long position
= strtoull(buf
, &ep
, 0);
2121 dprintf(Name
": Read sync_max sysfs entry is: %s\n", buf
);
2122 if (!(ep
== buf
|| (*ep
!= 0 && *ep
!= '\n' && *ep
!= ' '))) {
2123 position
*= get_data_disks(level
,
2125 info
->array
.raid_disks
);
2126 if (info
->reshape_progress
< position
) {
2127 dprintf("Corrected reshape progress (%llu) to "
2128 "md position (%llu)\n",
2129 info
->reshape_progress
, position
);
2130 info
->reshape_progress
= position
;
2132 } else if (info
->reshape_progress
> position
) {
2133 pr_err("Fatal error: array "
2134 "reshape was not properly frozen "
2135 "(expected reshape position is %llu, "
2136 "but reshape progress is %llu.\n",
2137 position
, info
->reshape_progress
);
2140 dprintf("Reshape position in md and metadata "
2145 } else if (rv
== 0) {
2146 /* for valid sysfs entry, 0-length content
2147 * should be indicated as error
2155 static int raid10_reshape(char *container
, int fd
, char *devname
,
2156 struct supertype
*st
, struct mdinfo
*info
,
2157 struct reshape
*reshape
,
2158 unsigned long long data_offset
,
2159 int force
, int verbose
)
2161 /* Changing raid_disks, layout, chunksize or possibly
2162 * just data_offset for a RAID10.
2163 * We must always change data_offset. We change by at least
2164 * ->backup_blocks which is the largest of the old and new
2166 * If raid_disks is increasing, then data_offset must decrease
2167 * by at least this copy size.
2168 * If raid_disks is unchanged, data_offset must increase or
2169 * decrease by at least backup_blocks but preferably by much more.
2170 * We choose half of the available space.
2171 * If raid_disks is decreasing, data_offset must increase by
2172 * at least backup_blocks. To allow of this, component_size
2173 * must be decreased by the same amount.
2175 * So we calculate the required minimum and direction, possibly
2176 * reduce the component_size, then iterate through the devices
2177 * and set the new_data_offset.
2178 * If that all works, we set chunk_size, layout, raid_disks, and start
2181 struct mdinfo
*sra
, *sd
;
2182 unsigned long long min
;
2186 sra
= sysfs_read(fd
, 0,
2187 GET_COMPONENT
|GET_DEVS
|GET_OFFSET
|GET_STATE
|GET_CHUNK
2190 fprintf(stderr
, Name
": %s: Cannot get array details from sysfs\n",
2194 min
= reshape
->backup_blocks
;
2196 if (info
->delta_disks
)
2197 sysfs_set_str(sra
, NULL
, "reshape_direction",
2198 info
->delta_disks
< 0 ? "backwards" : "forwards");
2199 if (info
->delta_disks
< 0 &&
2200 info
->space_after
< reshape
->backup_blocks
) {
2201 int rv
= sysfs_set_num(sra
, NULL
, "component_size",
2202 (sra
->component_size
-
2203 reshape
->backup_blocks
)/2);
2205 fprintf(stderr
, Name
": cannot reduce component size\n");
2209 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
2213 struct supertype
*st2
;
2214 struct mdinfo info2
;
2216 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
2218 dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 0);
2219 dfd
= dev_open(dn
, O_RDONLY
);
2222 Name
": %s: cannot open component %s\n",
2223 devname
, dn
? dn
: "-unknown-");
2227 st2
= dup_super(st
);
2228 rv
= st2
->ss
->load_super(st2
,dfd
, NULL
);
2232 fprintf(stderr
, ": %s: cannot get superblock from %s\n",
2236 st2
->ss
->getinfo_super(st2
, &info2
, NULL
);
2237 st2
->ss
->free_super(st2
);
2239 if (info
->delta_disks
< 0) {
2240 /* Don't need any space as array is shrinking
2241 * just move data_offset up by min
2243 if (data_offset
== 1)
2244 info2
.new_data_offset
= info2
.data_offset
+ min
;
2246 if ((unsigned long long)data_offset
2247 < info2
.data_offset
+ min
) {
2248 fprintf(stderr
, Name
": --data-offset too small for %s\n",
2252 info2
.new_data_offset
= data_offset
;
2254 } else if (info
->delta_disks
> 0) {
2255 /* need space before */
2256 if (info2
.space_before
< min
) {
2257 fprintf(stderr
, Name
": Insufficient head-space for reshape on %s\n",
2261 if (data_offset
== 1)
2262 info2
.new_data_offset
= info2
.data_offset
- min
;
2264 if ((unsigned long long)data_offset
2265 > info2
.data_offset
- min
) {
2266 fprintf(stderr
, Name
": --data-offset too large for %s\n",
2270 info2
.new_data_offset
= data_offset
;
2274 /* can move up or down. 'data_offset'
2275 * might guide us, otherwise choose
2276 * direction with most space
2278 if (data_offset
== 1) {
2279 if (info2
.space_before
> info2
.space_after
)
2283 } else if (data_offset
< info2
.data_offset
)
2287 sysfs_set_str(sra
, NULL
, "reshape_direction",
2288 dir
== 1 ? "backwards" : "forwards");
2291 case 1: /* Increase data offset */
2292 if (info2
.space_after
< min
) {
2293 fprintf(stderr
, Name
": Insufficient tail-space for reshape on %s\n",
2297 if (data_offset
!= 1 &&
2298 data_offset
< info2
.data_offset
+ min
) {
2299 fprintf(stderr
, Name
": --data-offset too small on %s\n",
2303 if (data_offset
!= 1)
2304 info2
.new_data_offset
= data_offset
;
2306 unsigned long long off
=
2307 info2
.space_after
/ 2;
2311 info2
.new_data_offset
=
2312 info2
.data_offset
+ off
;
2315 case -1: /* Decrease data offset */
2316 if (info2
.space_before
< min
) {
2317 fprintf(stderr
, Name
": insufficient head-room on %s\n",
2321 if (data_offset
!= 1 &&
2322 data_offset
< info2
.data_offset
- min
) {
2323 fprintf(stderr
, Name
": --data-offset too small on %s\n",
2327 if (data_offset
!= 1)
2328 info2
.new_data_offset
= data_offset
;
2330 unsigned long long off
=
2331 info2
.space_before
/ 2;
2335 info2
.new_data_offset
=
2336 info2
.data_offset
- off
;
2341 if (sysfs_set_num(sra
, sd
, "new_offset",
2342 info2
.new_data_offset
) < 0) {
2344 fprintf(stderr
, Name
": Cannot set new_offset for %s\n",
2349 if (!err
&& sysfs_set_num(sra
, NULL
, "chunk_size", info
->new_chunk
) < 0)
2351 if (!err
&& sysfs_set_num(sra
, NULL
, "layout", reshape
->after
.layout
) < 0)
2353 if (!err
&& sysfs_set_num(sra
, NULL
, "raid_disks",
2354 info
->array
.raid_disks
+ info
->delta_disks
) < 0)
2356 if (!err
&& sysfs_set_str(sra
, NULL
, "sync_action", "reshape") < 0)
2359 fprintf(stderr
, Name
": Cannot set array shape for %s\n",
2362 (info
->array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2364 " Bitmap must be removed before"
2365 " shape can be changed\n");
2375 static void get_space_after(int fd
, struct supertype
*st
, struct mdinfo
*info
)
2377 struct mdinfo
*sra
, *sd
;
2378 /* Initialisation to silence compiler warning */
2379 unsigned long long min_space_before
= 0, min_space_after
= 0;
2382 sra
= sysfs_read(fd
, 0, GET_DEVS
);
2385 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
2388 struct supertype
*st2
;
2389 struct mdinfo info2
;
2391 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
2393 dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 0);
2394 dfd
= dev_open(dn
, O_RDONLY
);
2397 st2
= dup_super(st
);
2398 if (st2
->ss
->load_super(st2
,dfd
, NULL
)) {
2404 st2
->ss
->getinfo_super(st2
, &info2
, NULL
);
2405 st2
->ss
->free_super(st2
);
2408 min_space_before
> info2
.space_before
)
2409 min_space_before
= info2
.space_before
;
2411 min_space_after
> info2
.space_after
)
2412 min_space_after
= info2
.space_after
;
2415 if (sd
== NULL
&& !first
) {
2416 info
->space_after
= min_space_after
;
2417 info
->space_before
= min_space_before
;
2422 static int reshape_array(char *container
, int fd
, char *devname
,
2423 struct supertype
*st
, struct mdinfo
*info
,
2424 int force
, struct mddev_dev
*devlist
,
2425 unsigned long long data_offset
,
2426 char *backup_file
, int verbose
, int forked
,
2427 int restart
, int freeze_reshape
)
2429 struct reshape reshape
;
2432 int orig_level
= UnSet
;
2436 struct mdu_array_info_s array
;
2439 struct mddev_dev
*dv
;
2443 unsigned long long *offsets
= NULL
;
2447 unsigned long blocks
;
2448 unsigned long cache
;
2449 unsigned long long array_size
;
2451 struct mdinfo
*sra
= NULL
;
2453 /* when reshaping a RAID0, the component_size might be zero.
2454 * So try to fix that up.
2456 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) != 0) {
2457 dprintf("Cannot get array information.\n");
2460 if (array
.level
== 0 && info
->component_size
== 0) {
2461 get_dev_size(fd
, NULL
, &array_size
);
2462 info
->component_size
= array_size
/ array
.raid_disks
;
2465 if (array
.level
== 10)
2466 /* Need space_after info */
2467 get_space_after(fd
, st
, info
);
2469 if (info
->reshape_active
) {
2470 int new_level
= info
->new_level
;
2471 info
->new_level
= UnSet
;
2472 if (info
->delta_disks
> 0)
2473 info
->array
.raid_disks
-= info
->delta_disks
;
2474 msg
= analyse_change(info
, &reshape
);
2475 info
->new_level
= new_level
;
2476 if (info
->delta_disks
> 0)
2477 info
->array
.raid_disks
+= info
->delta_disks
;
2479 /* Make sure the array isn't read-only */
2480 ioctl(fd
, RESTART_ARRAY_RW
, 0);
2482 msg
= analyse_change(info
, &reshape
);
2484 pr_err("%s\n", msg
);
2488 (reshape
.level
!= info
->array
.level
||
2489 reshape
.before
.layout
!= info
->array
.layout
||
2490 reshape
.before
.data_disks
+ reshape
.parity
2491 != info
->array
.raid_disks
- max(0, info
->delta_disks
))) {
2492 pr_err("reshape info is not in native format -"
2493 " cannot continue.\n");
2497 if (st
->ss
->external
&& restart
&& (info
->reshape_progress
== 0)) {
2498 /* When reshape is restarted from '0', very begin of array
2499 * it is possible that for external metadata reshape and array
2500 * configuration doesn't happen.
2501 * Check if md has the same opinion, and reshape is restarted
2502 * from 0. If so, this is regular reshape start after reshape
2503 * switch in metadata to next array only.
2505 if ((verify_reshape_position(info
, reshape
.level
) >= 0) &&
2506 (info
->reshape_progress
== 0))
2510 /* reshape already started. just skip to monitoring the reshape */
2511 if (reshape
.backup_blocks
== 0)
2515 /* The container is frozen but the array may not be.
2516 * So freeze the array so spares don't get put to the wrong use
2517 * FIXME there should probably be a cleaner separation between
2518 * freeze_array and freeze_container.
2520 sysfs_freeze_array(info
);
2521 /* Check we have enough spares to not be degraded */
2523 for (dv
= devlist
; dv
; dv
=dv
->next
)
2525 spares_needed
= max(reshape
.before
.data_disks
,
2526 reshape
.after
.data_disks
)
2527 + reshape
.parity
- array
.raid_disks
;
2530 info
->new_level
> 1 && info
->array
.level
> 1 &&
2531 spares_needed
> info
->array
.spare_disks
+ added_disks
) {
2532 pr_err("Need %d spare%s to avoid degraded array,"
2533 " and only have %d.\n"
2534 " Use --force to over-ride this check.\n",
2536 spares_needed
== 1 ? "" : "s",
2537 info
->array
.spare_disks
+ added_disks
);
2540 /* Check we have enough spares to not fail */
2541 spares_needed
= max(reshape
.before
.data_disks
,
2542 reshape
.after
.data_disks
)
2544 if ((info
->new_level
> 1 || info
->new_level
== 0) &&
2545 spares_needed
> info
->array
.spare_disks
+added_disks
) {
2546 pr_err("Need %d spare%s to create working array,"
2547 " and only have %d.\n",
2549 spares_needed
== 1 ? "" : "s",
2550 info
->array
.spare_disks
+ added_disks
);
2554 if (reshape
.level
!= array
.level
) {
2555 char *c
= map_num(pers
, reshape
.level
);
2560 err
= sysfs_set_str(info
, NULL
, "level", c
);
2563 pr_err("%s: could not set level to %s\n",
2566 (info
->array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2567 cont_err("Bitmap must be removed"
2568 " before level can be changed\n");
2572 pr_err("level of %s changed to %s\n",
2574 orig_level
= array
.level
;
2575 sysfs_freeze_array(info
);
2577 if (reshape
.level
> 0 && st
->ss
->external
) {
2578 /* make sure mdmon is aware of the new level */
2579 if (mdmon_running(st
->container_dev
))
2580 flush_mdmon(container
);
2582 if (!mdmon_running(st
->container_dev
))
2583 start_mdmon(st
->container_dev
);
2584 ping_monitor(container
);
2585 if (mdmon_running(st
->container_dev
) &&
2586 st
->update_tail
== NULL
)
2587 st
->update_tail
= &st
->updates
;
2590 /* ->reshape_super might have chosen some spares from the
2591 * container that it wants to be part of the new array.
2592 * We can collect them with ->container_content and give
2593 * them to the kernel.
2595 if (st
->ss
->reshape_super
&& st
->ss
->container_content
) {
2596 char *subarray
= strchr(info
->text_version
+1, '/')+1;
2597 struct mdinfo
*info2
=
2598 st
->ss
->container_content(st
, subarray
);
2602 sysfs_init(info2
, fd
, st
->devnum
);
2603 /* When increasing number of devices, we need to set
2604 * new raid_disks before adding these, or they might
2607 if (reshape
.backup_blocks
&&
2608 reshape
.after
.data_disks
> reshape
.before
.data_disks
)
2609 subarray_set_num(container
, info2
, "raid_disks",
2610 reshape
.after
.data_disks
+
2612 for (d
= info2
->devs
; d
; d
= d
->next
) {
2613 if (d
->disk
.state
== 0 &&
2614 d
->disk
.raid_disk
>= 0) {
2615 /* This is a spare that wants to
2616 * be part of the array.
2618 add_disk(fd
, st
, info2
, d
);
2624 /* We might have been given some devices to add to the
2625 * array. Now that the array has been changed to the right
2626 * level and frozen, we can safely add them.
2629 Manage_subdevs(devname
, fd
, devlist
, verbose
,
2632 if (reshape
.backup_blocks
== 0) {
2633 /* No restriping needed, but we might need to impose
2634 * some more changes: layout, raid_disks, chunk_size
2636 /* read current array info */
2637 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) != 0) {
2638 dprintf("Cannot get array information.\n");
2641 /* compare current array info with new values and if
2642 * it is different update them to new */
2643 if (info
->new_layout
!= UnSet
&&
2644 info
->new_layout
!= array
.layout
) {
2645 array
.layout
= info
->new_layout
;
2646 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
2647 pr_err("failed to set new layout\n");
2649 } else if (verbose
>= 0)
2650 printf("layout for %s set to %d\n",
2651 devname
, array
.layout
);
2653 if (info
->delta_disks
!= UnSet
&&
2654 info
->delta_disks
!= 0 &&
2655 array
.raid_disks
!= (info
->array
.raid_disks
+ info
->delta_disks
)) {
2656 array
.raid_disks
+= info
->delta_disks
;
2657 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
2658 pr_err("failed to set raid disks\n");
2660 } else if (verbose
>= 0) {
2661 printf("raid_disks for %s set to %d\n",
2662 devname
, array
.raid_disks
);
2665 if (info
->new_chunk
!= 0 &&
2666 info
->new_chunk
!= array
.chunk_size
) {
2667 if (sysfs_set_num(info
, NULL
,
2668 "chunk_size", info
->new_chunk
) != 0) {
2669 pr_err("failed to set chunk size\n");
2671 } else if (verbose
>= 0)
2672 printf("chunk size for %s set to %d\n",
2673 devname
, array
.chunk_size
);
2680 * There are three possibilities.
2681 * 1/ The array will shrink.
2682 * We need to ensure the reshape will pause before reaching
2683 * the 'critical section'. We also need to fork and wait for
2684 * that to happen. When it does we
2685 * suspend/backup/complete/unfreeze
2687 * 2/ The array will not change size.
2688 * This requires that we keep a backup of a sliding window
2689 * so that we can restore data after a crash. So we need
2690 * to fork and monitor progress.
2691 * In future we will allow the data_offset to change, so
2692 * a sliding backup becomes unnecessary.
2694 * 3/ The array will grow. This is relatively easy.
2695 * However the kernel's restripe routines will cheerfully
2696 * overwrite some early data before it is safe. So we
2697 * need to make a backup of the early parts of the array
2698 * and be ready to restore it if rebuild aborts very early.
2699 * For externally managed metadata, we still need a forked
2700 * child to monitor the reshape and suspend IO over the region
2701 * that is being reshaped.
2703 * We backup data by writing it to one spare, or to a
2704 * file which was given on command line.
2706 * In each case, we first make sure that storage is available
2707 * for the required backup.
2709 * - request the shape change.
2710 * - fork to handle backup etc.
2712 /* Check that we can hold all the data */
2713 get_dev_size(fd
, NULL
, &array_size
);
2714 if (reshape
.new_size
< (array_size
/512)) {
2715 pr_err("this change will reduce the size of the array.\n"
2716 " use --grow --array-size first to truncate array.\n"
2717 " e.g. mdadm --grow %s --array-size %llu\n",
2718 devname
, reshape
.new_size
/2);
2724 if (array
.level
== 10) {
2725 /* Reshaping RAID10 does not require and data backup by
2726 * user-space. Instead it requires that the data_offset
2727 * is changed to avoid the need for backup.
2728 * So this is handled very separately
2731 /* Nothing to do. */
2733 return raid10_reshape(container
, fd
, devname
, st
, info
,
2734 &reshape
, data_offset
,
2737 sra
= sysfs_read(fd
, 0,
2738 GET_COMPONENT
|GET_DEVS
|GET_OFFSET
|GET_STATE
|GET_CHUNK
|
2741 pr_err("%s: Cannot get array details from sysfs\n",
2746 /* Decide how many blocks (sectors) for a reshape
2747 * unit. The number we have so far is just a minimum
2749 blocks
= reshape
.backup_blocks
;
2750 if (reshape
.before
.data_disks
==
2751 reshape
.after
.data_disks
) {
2752 /* Make 'blocks' bigger for better throughput, but
2753 * not so big that we reject it below.
2754 * Try for 16 megabytes
2756 while (blocks
* 32 < sra
->component_size
&&
2760 pr_err("Need to backup %luK of critical "
2761 "section..\n", blocks
/2);
2763 if (blocks
>= sra
->component_size
/2) {
2764 pr_err("%s: Something wrong"
2765 " - reshape aborted\n",
2770 /* Now we need to open all these devices so we can read/write.
2772 nrdisks
= max(reshape
.before
.data_disks
,
2773 reshape
.after
.data_disks
) + reshape
.parity
2774 + sra
->array
.spare_disks
;
2775 fdlist
= xcalloc((1+nrdisks
), sizeof(int));
2776 offsets
= xcalloc((1+nrdisks
), sizeof(offsets
[0]));
2778 odisks
= reshape
.before
.data_disks
+ reshape
.parity
;
2779 d
= reshape_prepare_fdlist(devname
, sra
, odisks
,
2780 nrdisks
, blocks
, backup_file
,
2785 if ((st
->ss
->manage_reshape
== NULL
) ||
2786 (st
->ss
->recover_backup
== NULL
)) {
2787 if (backup_file
== NULL
) {
2788 if (reshape
.after
.data_disks
<=
2789 reshape
.before
.data_disks
) {
2790 pr_err("%s: Cannot grow - "
2791 "need backup-file\n", devname
);
2793 } else if (sra
->array
.spare_disks
== 0) {
2794 pr_err("%s: Cannot grow - "
2795 "need a spare or backup-file to backup "
2796 "critical section\n", devname
);
2800 if (!reshape_open_backup_file(backup_file
, fd
, devname
,
2802 fdlist
+d
, offsets
+d
,
2810 /* lastly, check that the internal stripe cache is
2811 * large enough, or it won't work.
2812 * It must hold at least 4 stripes of the larger
2815 cache
= max(info
->array
.chunk_size
, info
->new_chunk
);
2816 cache
*= 4; /* 4 stripes minimum */
2817 cache
/= 512; /* convert to sectors */
2818 disks
= min(reshape
.before
.data_disks
, reshape
.after
.data_disks
);
2819 /* make sure there is room for 'blocks' with a bit to spare */
2820 if (cache
< 16 + blocks
/ disks
)
2821 cache
= 16 + blocks
/ disks
;
2822 cache
/= (4096/512); /* Covert from sectors to pages */
2824 if (sra
->cache_size
< cache
)
2825 subarray_set_num(container
, sra
, "stripe_cache_size",
2828 /* Right, everything seems fine. Let's kick things off.
2829 * If only changing raid_disks, use ioctl, else use
2834 sra
->new_chunk
= info
->new_chunk
;
2837 /* for external metadata checkpoint saved by mdmon can be lost
2838 * or missed /due to e.g. crash/. Check if md is not during
2839 * restart farther than metadata points to.
2840 * If so, this means metadata information is obsolete.
2842 if (st
->ss
->external
)
2843 verify_reshape_position(info
, reshape
.level
);
2844 sra
->reshape_progress
= info
->reshape_progress
;
2846 sra
->reshape_progress
= 0;
2847 if (reshape
.after
.data_disks
< reshape
.before
.data_disks
)
2848 /* start from the end of the new array */
2849 sra
->reshape_progress
= (sra
->component_size
2850 * reshape
.after
.data_disks
);
2853 if (info
->array
.chunk_size
== info
->new_chunk
&&
2854 reshape
.before
.layout
== reshape
.after
.layout
&&
2855 st
->ss
->external
== 0) {
2856 /* use SET_ARRAY_INFO but only if reshape hasn't started */
2857 ioctl(fd
, GET_ARRAY_INFO
, &array
);
2858 array
.raid_disks
= reshape
.after
.data_disks
+ reshape
.parity
;
2860 ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
2863 pr_err("Cannot set device shape for %s: %s\n",
2864 devname
, strerror(errno
));
2867 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2868 cont_err("Bitmap must be removed before"
2869 " shape can be changed\n");
2873 } else if (!restart
) {
2874 /* set them all just in case some old 'new_*' value
2875 * persists from some earlier problem.
2878 if (sysfs_set_num(sra
, NULL
, "chunk_size", info
->new_chunk
) < 0)
2880 if (!err
&& sysfs_set_num(sra
, NULL
, "layout",
2881 reshape
.after
.layout
) < 0)
2883 if (!err
&& subarray_set_num(container
, sra
, "raid_disks",
2884 reshape
.after
.data_disks
+
2885 reshape
.parity
) < 0)
2888 pr_err("Cannot set device shape for %s\n",
2892 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2893 cont_err("Bitmap must be removed before"
2894 " shape can be changed\n");
2899 err
= start_reshape(sra
, restart
, reshape
.before
.data_disks
,
2900 reshape
.after
.data_disks
);
2902 pr_err("Cannot %s reshape for %s\n",
2903 restart
? "continue" : "start",
2908 sysfs_set_str(sra
, NULL
, "array_state", "active");
2909 if (freeze_reshape
) {
2913 pr_err("Reshape has to be continued from"
2914 " location %llu when root filesystem has been mounted.\n",
2915 sra
->reshape_progress
);
2919 /* Now we just need to kick off the reshape and watch, while
2920 * handling backups of the data...
2921 * This is all done by a forked background process.
2923 switch(forked
? 0 : fork()) {
2925 pr_err("Cannot run child to monitor reshape: %s\n",
2939 /* If another array on the same devices is busy, the
2940 * reshape will wait for them. This would mean that
2941 * the first section that we suspend will stay suspended
2942 * for a long time. So check on that possibility
2943 * by looking for "DELAYED" in /proc/mdstat, and if found,
2947 struct mdstat_ent
*mds
, *m
;
2949 mds
= mdstat_read(0, 0);
2950 for (m
= mds
; m
; m
= m
->next
)
2951 if (m
->devnum
== devname2devnum(sra
->sys_name
)) {
2953 m
->percent
== RESYNC_DELAYED
)
2956 /* Haven't started the reshape thread
2963 if (delayed
== 1 && get_linux_version() < 3007000) {
2964 pr_err("Reshape is delayed, but cannot wait carefully with this kernel.\n"
2965 " You might experience problems until other reshapes complete.\n");
2969 sleep(30 - (delayed
-1) * 25);
2973 if (check_env("MDADM_GROW_VERIFY"))
2974 fd
= open(devname
, O_RDONLY
| O_DIRECT
);
2977 mlockall(MCL_FUTURE
);
2979 if (st
->ss
->external
) {
2980 /* metadata handler takes it from here */
2981 done
= st
->ss
->manage_reshape(
2982 fd
, sra
, &reshape
, st
, blocks
,
2984 d
- odisks
, fdlist
+odisks
,
2987 done
= child_monitor(
2988 fd
, sra
, &reshape
, st
, blocks
,
2990 d
- odisks
, fdlist
+odisks
,
2996 if (backup_file
&& done
)
2997 unlink(backup_file
);
3003 if (!st
->ss
->external
&&
3004 !(reshape
.before
.data_disks
!= reshape
.after
.data_disks
3005 && info
->custom_array_size
) &&
3006 info
->new_level
== reshape
.level
&&
3008 /* no need to wait for the reshape to finish as
3009 * there is nothing more to do.
3016 if (st
->ss
->external
) {
3017 /* Re-load the metadata as much could have changed */
3018 int cfd
= open_dev(st
->container_dev
);
3020 flush_mdmon(container
);
3021 st
->ss
->free_super(st
);
3022 st
->ss
->load_container(st
, cfd
, container
);
3027 /* set new array size if required customer_array_size is used
3030 if (reshape
.before
.data_disks
!=
3031 reshape
.after
.data_disks
&&
3032 info
->custom_array_size
)
3033 set_array_size(st
, info
, info
->text_version
);
3035 if (info
->new_level
!= reshape
.level
) {
3037 c
= map_num(pers
, info
->new_level
);
3039 err
= sysfs_set_str(sra
, NULL
, "level", c
);
3041 pr_err("%s: could not set level "
3042 "to %s\n", devname
, c
);
3044 if (info
->new_level
== 0)
3045 st
->update_tail
= NULL
;
3057 if (orig_level
!= UnSet
&& sra
) {
3058 c
= map_num(pers
, orig_level
);
3059 if (c
&& sysfs_set_str(sra
, NULL
, "level", c
) == 0)
3060 pr_err("aborting level change\n");
3068 /* mdfd handle is passed to be closed in child process (after fork).
3070 int reshape_container(char *container
, char *devname
,
3072 struct supertype
*st
,
3073 struct mdinfo
*info
,
3076 int verbose
, int restart
, int freeze_reshape
)
3078 struct mdinfo
*cc
= NULL
;
3080 int last_devnum
= -1;
3082 /* component_size is not meaningful for a container,
3083 * so pass '0' meaning 'no change'
3086 reshape_super(st
, 0, info
->new_level
,
3087 info
->new_layout
, info
->new_chunk
,
3088 info
->array
.raid_disks
, info
->delta_disks
,
3089 backup_file
, devname
, APPLY_METADATA_CHANGES
,
3097 /* ping monitor to be sure that update is on disk
3099 ping_monitor(container
);
3102 case -1: /* error */
3103 perror("Cannot fork to complete reshape\n");
3106 default: /* parent */
3107 if (!freeze_reshape
)
3108 printf(Name
": multi-array reshape continues"
3109 " in background\n");
3116 /* close unused handle in child process
3122 /* For each member array with reshape_active,
3123 * we need to perform the reshape.
3124 * We pick the first array that needs reshaping and
3125 * reshape it. reshape_array() will re-read the metadata
3126 * so the next time through a different array should be
3127 * ready for reshape.
3128 * It is possible that the 'different' array will not
3129 * be assembled yet. In that case we simple exit.
3130 * When it is assembled, the mdadm which assembles it
3131 * will take over the reshape.
3133 struct mdinfo
*content
;
3135 struct mdstat_ent
*mdstat
;
3140 cc
= st
->ss
->container_content(st
, NULL
);
3142 for (content
= cc
; content
; content
= content
->next
) {
3144 if (!content
->reshape_active
)
3147 subarray
= strchr(content
->text_version
+1, '/')+1;
3148 mdstat
= mdstat_by_subdev(subarray
,
3149 devname2devnum(container
));
3152 if (mdstat
->active
== 0) {
3153 pr_err("Skipping inactive "
3154 "array md%i.\n", mdstat
->devnum
);
3155 free_mdstat(mdstat
);
3164 adev
= map_dev(dev2major(mdstat
->devnum
),
3165 dev2minor(mdstat
->devnum
),
3168 adev
= content
->text_version
;
3170 fd
= open_dev(mdstat
->devnum
);
3172 printf(Name
": Device %s cannot be opened for reshape.",
3177 if (last_devnum
== mdstat
->devnum
) {
3178 /* Do not allow for multiple reshape_array() calls for
3180 * It can happen when reshape_array() returns without
3181 * error, when reshape is not finished (wrong reshape
3182 * starting/continuation conditions). Mdmon doesn't
3183 * switch to next array in container and reentry
3184 * conditions for the same array occur.
3185 * This is possibly interim until the behaviour of
3186 * reshape_array is resolved().
3188 printf(Name
": Multiple reshape execution detected for "
3189 "device %s.", adev
);
3193 last_devnum
= mdstat
->devnum
;
3195 sysfs_init(content
, fd
, mdstat
->devnum
);
3197 if (mdmon_running(devname2devnum(container
)))
3198 flush_mdmon(container
);
3200 rv
= reshape_array(container
, fd
, adev
, st
,
3201 content
, force
, NULL
, 0ULL,
3202 backup_file
, verbose
, 1, restart
,
3206 if (freeze_reshape
) {
3215 if (mdmon_running(devname2devnum(container
)))
3216 flush_mdmon(container
);
3225 * We run a child process in the background which performs the following
3227 * - wait for resync to reach a certain point
3228 * - suspend io to the following section
3229 * - backup that section
3230 * - allow resync to proceed further
3232 * - discard the backup.
3234 * When are combined in slightly different ways in the three cases.
3236 * - suspend/backup/allow/wait/resume/discard
3238 * - allow/wait/suspend/backup/allow/wait/resume/discard
3240 * - wait/resume/discard/suspend/backup/allow
3242 * suspend/backup/allow always come together
3243 * wait/resume/discard do too.
3244 * For the same-size case we have two backups to improve flow.
3248 int progress_reshape(struct mdinfo
*info
, struct reshape
*reshape
,
3249 unsigned long long backup_point
,
3250 unsigned long long wait_point
,
3251 unsigned long long *suspend_point
,
3252 unsigned long long *reshape_completed
)
3254 /* This function is called repeatedly by the reshape manager.
3255 * It determines how much progress can safely be made and allows
3257 * - 'info' identifies the array and particularly records in
3258 * ->reshape_progress the metadata's knowledge of progress
3259 * This is a sector offset from the start of the array
3260 * of the next array block to be relocated. This number
3261 * may increase from 0 or decrease from array_size, depending
3262 * on the type of reshape that is happening.
3263 * Note that in contrast, 'sync_completed' is a block count of the
3264 * reshape so far. It gives the distance between the start point
3265 * (head or tail of device) and the next place that data will be
3266 * written. It always increases.
3267 * - 'reshape' is the structure created by analyse_change
3268 * - 'backup_point' shows how much the metadata manager has backed-up
3269 * data. For reshapes with increasing progress, it is the next address
3270 * to be backed up, previous addresses have been backed-up. For
3271 * decreasing progress, it is the earliest address that has been
3272 * backed up - later address are also backed up.
3273 * So addresses between reshape_progress and backup_point are
3274 * backed up providing those are in the 'correct' order.
3275 * - 'wait_point' is an array address. When reshape_completed
3276 * passes this point, progress_reshape should return. It might
3277 * return earlier if it determines that ->reshape_progress needs
3278 * to be updated or further backup is needed.
3279 * - suspend_point is maintained by progress_reshape and the caller
3280 * should not touch it except to initialise to zero.
3281 * It is an array address and it only increases in 2.6.37 and earlier.
3282 * This makes it difficult to handle reducing reshapes with
3283 * external metadata.
3284 * However: it is similar to backup_point in that it records the
3285 * other end of a suspended region from reshape_progress.
3286 * it is moved to extend the region that is safe to backup and/or
3288 * - reshape_completed is read from sysfs and returned. The caller
3289 * should copy this into ->reshape_progress when it has reason to
3290 * believe that the metadata knows this, and any backup outside this
3294 * 1 if more data from backup_point - but only as far as suspend_point,
3295 * should be backed up
3296 * 0 if things are progressing smoothly
3297 * -1 if the reshape is finished because it is all done,
3298 * -2 if the reshape is finished due to an error.
3301 int advancing
= (reshape
->after
.data_disks
3302 >= reshape
->before
.data_disks
);
3303 unsigned long long need_backup
; /* All data between start of array and
3304 * here will at some point need to
3307 unsigned long long read_offset
, write_offset
;
3308 unsigned long long write_range
;
3309 unsigned long long max_progress
, target
, completed
;
3310 unsigned long long array_size
= (info
->component_size
3311 * reshape
->before
.data_disks
);
3315 /* First, we unsuspend any region that is now known to be safe.
3316 * If suspend_point is on the 'wrong' side of reshape_progress, then
3317 * we don't have or need suspension at the moment. This is true for
3318 * native metadata when we don't need to back-up.
3321 if (info
->reshape_progress
<= *suspend_point
)
3322 sysfs_set_num(info
, NULL
, "suspend_lo",
3323 info
->reshape_progress
);
3325 /* Note: this won't work in 2.6.37 and before.
3326 * Something somewhere should make sure we don't need it!
3328 if (info
->reshape_progress
>= *suspend_point
)
3329 sysfs_set_num(info
, NULL
, "suspend_hi",
3330 info
->reshape_progress
);
3333 /* Now work out how far it is safe to progress.
3334 * If the read_offset for ->reshape_progress is less than
3335 * 'blocks' beyond the write_offset, we can only progress as far
3337 * Otherwise we can progress until the write_offset for the new location
3338 * reaches (within 'blocks' of) the read_offset at the current location.
3339 * However that region must be suspended unless we are using native
3341 * If we need to suspend more, we limit it to 128M per device, which is
3342 * rather arbitrary and should be some time-based calculation.
3344 read_offset
= info
->reshape_progress
/ reshape
->before
.data_disks
;
3345 write_offset
= info
->reshape_progress
/ reshape
->after
.data_disks
;
3346 write_range
= info
->new_chunk
/512;
3347 if (reshape
->before
.data_disks
== reshape
->after
.data_disks
)
3348 need_backup
= array_size
;
3350 need_backup
= reshape
->backup_blocks
;
3352 if (read_offset
< write_offset
+ write_range
)
3353 max_progress
= backup_point
;
3357 reshape
->after
.data_disks
;
3359 if (read_offset
> write_offset
- write_range
)
3360 /* Can only progress as far as has been backed up,
3361 * which must be suspended */
3362 max_progress
= backup_point
;
3363 else if (info
->reshape_progress
<= need_backup
)
3364 max_progress
= backup_point
;
3366 if (info
->array
.major_version
>= 0)
3367 /* Can progress until backup is needed */
3368 max_progress
= need_backup
;
3370 /* Can progress until metadata update is required */
3373 reshape
->after
.data_disks
;
3374 /* but data must be suspended */
3375 if (max_progress
< *suspend_point
)
3376 max_progress
= *suspend_point
;
3381 /* We know it is safe to progress to 'max_progress' providing
3382 * it is suspended or we are using native metadata.
3383 * Consider extending suspend_point 128M per device if it
3384 * is less than 64M per device beyond reshape_progress.
3385 * But always do a multiple of 'blocks'
3386 * FIXME this is too big - it takes to long to complete
3389 target
= 64*1024*2 * min(reshape
->before
.data_disks
,
3390 reshape
->after
.data_disks
);
3391 target
/= reshape
->backup_blocks
;
3394 target
*= reshape
->backup_blocks
;
3396 /* For externally managed metadata we always need to suspend IO to
3397 * the area being reshaped so we regularly push suspend_point forward.
3398 * For native metadata we only need the suspend if we are going to do
3402 if ((need_backup
> info
->reshape_progress
3403 || info
->array
.major_version
< 0) &&
3404 *suspend_point
< info
->reshape_progress
+ target
) {
3405 if (need_backup
< *suspend_point
+ 2 * target
)
3406 *suspend_point
= need_backup
;
3407 else if (*suspend_point
+ 2 * target
< array_size
)
3408 *suspend_point
+= 2 * target
;
3410 *suspend_point
= array_size
;
3411 sysfs_set_num(info
, NULL
, "suspend_hi", *suspend_point
);
3412 if (max_progress
> *suspend_point
)
3413 max_progress
= *suspend_point
;
3416 if (info
->array
.major_version
>= 0) {
3417 /* Only need to suspend when about to backup */
3418 if (info
->reshape_progress
< need_backup
* 2 &&
3419 *suspend_point
> 0) {
3421 sysfs_set_num(info
, NULL
, "suspend_lo", 0);
3422 sysfs_set_num(info
, NULL
, "suspend_hi", need_backup
);
3425 /* Need to suspend continually */
3426 if (info
->reshape_progress
< *suspend_point
)
3427 *suspend_point
= info
->reshape_progress
;
3428 if (*suspend_point
+ target
< info
->reshape_progress
)
3429 /* No need to move suspend region yet */;
3431 if (*suspend_point
>= 2 * target
)
3432 *suspend_point
-= 2 * target
;
3435 sysfs_set_num(info
, NULL
, "suspend_lo",
3438 if (max_progress
< *suspend_point
)
3439 max_progress
= *suspend_point
;
3443 /* now set sync_max to allow that progress. sync_max, like
3444 * sync_completed is a count of sectors written per device, so
3445 * we find the difference between max_progress and the start point,
3446 * and divide that by after.data_disks to get a sync_max
3448 * At the same time we convert wait_point to a similar number
3449 * for comparing against sync_completed.
3451 /* scale down max_progress to per_disk */
3452 max_progress
/= reshape
->after
.data_disks
;
3453 /* Round to chunk size as some kernels give an erroneously high number */
3454 max_progress
/= info
->new_chunk
/512;
3455 max_progress
*= info
->new_chunk
/512;
3456 /* And round to old chunk size as the kernel wants that */
3457 max_progress
/= info
->array
.chunk_size
/512;
3458 max_progress
*= info
->array
.chunk_size
/512;
3459 /* Limit progress to the whole device */
3460 if (max_progress
> info
->component_size
)
3461 max_progress
= info
->component_size
;
3462 wait_point
/= reshape
->after
.data_disks
;
3464 /* switch from 'device offset' to 'processed block count' */
3465 max_progress
= info
->component_size
- max_progress
;
3466 wait_point
= info
->component_size
- wait_point
;
3469 sysfs_set_num(info
, NULL
, "sync_max", max_progress
);
3471 /* Now wait. If we have already reached the point that we were
3472 * asked to wait to, don't wait at all, else wait for any change.
3473 * We need to select on 'sync_completed' as that is the place that
3474 * notifications happen, but we are really interested in
3475 * 'reshape_position'
3477 fd
= sysfs_get_fd(info
, NULL
, "sync_completed");
3479 goto check_progress
;
3481 if (sysfs_fd_get_ll(fd
, &completed
) < 0)
3482 goto check_progress
;
3484 while (completed
< max_progress
&& completed
< wait_point
) {
3485 /* Check that sync_action is still 'reshape' to avoid
3486 * waiting forever on a dead array
3490 if (sysfs_get_str(info
, NULL
, "sync_action",
3492 strncmp(action
, "reshape", 7) != 0)
3494 /* Some kernels reset 'sync_completed' to zero
3495 * before setting 'sync_action' to 'idle'.
3496 * So we need these extra tests.
3498 if (completed
== 0 && advancing
3499 && info
->reshape_progress
> 0)
3501 if (completed
== 0 && !advancing
3502 && info
->reshape_progress
< (info
->component_size
3503 * reshape
->after
.data_disks
))
3507 select(fd
+1, NULL
, NULL
, &rfds
, NULL
);
3508 if (sysfs_fd_get_ll(fd
, &completed
) < 0)
3509 goto check_progress
;
3511 /* Some kernels reset 'sync_completed' to zero,
3512 * we need to have real point we are in md
3515 completed
= max_progress
;
3517 /* some kernels can give an incorrectly high 'completed' number */
3518 completed
/= (info
->new_chunk
/512);
3519 completed
*= (info
->new_chunk
/512);
3520 /* Convert 'completed' back in to a 'progress' number */
3521 completed
*= reshape
->after
.data_disks
;
3523 completed
= info
->component_size
* reshape
->after
.data_disks
3526 *reshape_completed
= completed
;
3530 /* We return the need_backup flag. Caller will decide
3531 * how much - a multiple of ->backup_blocks up to *suspend_point
3534 return need_backup
> info
->reshape_progress
;
3536 return need_backup
>= info
->reshape_progress
;
3539 /* if we couldn't read a number from sync_completed, then
3540 * either the reshape did complete, or it aborted.
3541 * We can tell which by checking for 'none' in reshape_position.
3542 * If it did abort, then it might immediately restart if it
3543 * it was just a device failure that leaves us degraded but
3547 if (sysfs_get_str(info
, NULL
, "reshape_position", buf
, sizeof(buf
)) < 0
3548 || strncmp(buf
, "none", 4) != 0) {
3549 /* The abort might only be temporary. Wait up to 10
3550 * seconds for fd to contain a valid number again.
3556 while (fd
>= 0 && rv
< 0 && tv
.tv_sec
> 0) {
3560 if (select(fd
+1, NULL
, NULL
, &rfds
, &tv
) != 1)
3562 switch (sysfs_fd_get_ll(fd
, &completed
)) {
3564 /* all good again */
3567 case -2: /* read error - abort */
3574 return rv
; /* abort */
3576 /* Maybe racing with array shutdown - check state */
3579 if (sysfs_get_str(info
, NULL
, "array_state", buf
, sizeof(buf
)) < 0
3580 || strncmp(buf
, "inactive", 8) == 0
3581 || strncmp(buf
, "clear",5) == 0)
3582 return -2; /* abort */
3583 return -1; /* complete */
3587 /* FIXME return status is never checked */
3588 static int grow_backup(struct mdinfo
*sra
,
3589 unsigned long long offset
, /* per device */
3590 unsigned long stripes
, /* per device, in old chunks */
3591 int *sources
, unsigned long long *offsets
,
3592 int disks
, int chunk
, int level
, int layout
,
3593 int dests
, int *destfd
, unsigned long long *destoffsets
,
3594 int part
, int *degraded
,
3597 /* Backup 'blocks' sectors at 'offset' on each device of the array,
3598 * to storage 'destfd' (offset 'destoffsets'), after first
3599 * suspending IO. Then allow resync to continue
3600 * over the suspended section.
3601 * Use part 'part' of the backup-super-block.
3606 unsigned long long ll
;
3608 //printf("offset %llu\n", offset);
3614 /* Check that array hasn't become degraded, else we might backup the wrong data */
3615 if (sysfs_get_ll(sra
, NULL
, "degraded", &ll
) < 0)
3616 return -1; /* FIXME this error is ignored */
3617 new_degraded
= (int)ll
;
3618 if (new_degraded
!= *degraded
) {
3619 /* check each device to ensure it is still working */
3621 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
3622 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
3624 if (sd
->disk
.state
& (1<<MD_DISK_SYNC
)) {
3626 if (sysfs_get_str(sra
, sd
, "state", sbuf
, 20) < 0 ||
3627 strstr(sbuf
, "faulty") ||
3628 strstr(sbuf
, "in_sync") == NULL
) {
3629 /* this device is dead */
3630 sd
->disk
.state
= (1<<MD_DISK_FAULTY
);
3631 if (sd
->disk
.raid_disk
>= 0 &&
3632 sources
[sd
->disk
.raid_disk
] >= 0) {
3633 close(sources
[sd
->disk
.raid_disk
]);
3634 sources
[sd
->disk
.raid_disk
] = -1;
3639 *degraded
= new_degraded
;
3642 bsb
.arraystart2
= __cpu_to_le64(offset
* odata
);
3643 bsb
.length2
= __cpu_to_le64(stripes
* (chunk
/512) * odata
);
3645 bsb
.arraystart
= __cpu_to_le64(offset
* odata
);
3646 bsb
.length
= __cpu_to_le64(stripes
* (chunk
/512) * odata
);
3649 bsb
.magic
[15] = '2';
3650 for (i
= 0; i
< dests
; i
++)
3652 lseek64(destfd
[i
], destoffsets
[i
] + __le64_to_cpu(bsb
.devstart2
)*512, 0);
3654 lseek64(destfd
[i
], destoffsets
[i
], 0);
3656 rv
= save_stripes(sources
, offsets
,
3657 disks
, chunk
, level
, layout
,
3659 offset
*512*odata
, stripes
* chunk
* odata
,
3664 bsb
.mtime
= __cpu_to_le64(time(0));
3665 for (i
= 0; i
< dests
; i
++) {
3666 bsb
.devstart
= __cpu_to_le64(destoffsets
[i
]/512);
3668 bsb
.sb_csum
= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
));
3669 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0)
3670 bsb
.sb_csum2
= bsb_csum((char*)&bsb
,
3671 ((char*)&bsb
.sb_csum2
)-((char*)&bsb
));
3674 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
] - 4096, 0)
3675 != destoffsets
[i
] - 4096)
3677 if (write(destfd
[i
], &bsb
, 512) != 512)
3679 if (destoffsets
[i
] > 4096) {
3680 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
]+stripes
*chunk
*odata
, 0) !=
3681 destoffsets
[i
]+stripes
*chunk
*odata
)
3683 if (write(destfd
[i
], &bsb
, 512) != 512)
3693 /* in 2.6.30, the value reported by sync_completed can be
3694 * less that it should be by one stripe.
3695 * This only happens when reshape hits sync_max and pauses.
3696 * So allow wait_backup to either extent sync_max further
3697 * than strictly necessary, or return before the
3698 * sync has got quite as far as we would really like.
3699 * This is what 'blocks2' is for.
3700 * The various caller give appropriate values so that
3703 /* FIXME return value is often ignored */
3704 static int forget_backup(int dests
, int *destfd
,
3705 unsigned long long *destoffsets
,
3709 * Erase backup 'part' (which is 0 or 1)
3715 bsb
.arraystart2
= __cpu_to_le64(0);
3716 bsb
.length2
= __cpu_to_le64(0);
3718 bsb
.arraystart
= __cpu_to_le64(0);
3719 bsb
.length
= __cpu_to_le64(0);
3721 bsb
.mtime
= __cpu_to_le64(time(0));
3723 for (i
= 0; i
< dests
; i
++) {
3724 bsb
.devstart
= __cpu_to_le64(destoffsets
[i
]/512);
3725 bsb
.sb_csum
= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
));
3726 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0)
3727 bsb
.sb_csum2
= bsb_csum((char*)&bsb
,
3728 ((char*)&bsb
.sb_csum2
)-((char*)&bsb
));
3729 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
]-4096, 0) !=
3730 destoffsets
[i
]-4096)
3733 write(destfd
[i
], &bsb
, 512) != 512)
3740 static void fail(char *msg
)
3743 rv
= (write(2, msg
, strlen(msg
)) != (int)strlen(msg
));
3744 rv
|= (write(2, "\n", 1) != 1);
3748 static char *abuf
, *bbuf
;
3749 static unsigned long long abuflen
;
3750 static void validate(int afd
, int bfd
, unsigned long long offset
)
3752 /* check that the data in the backup against the array.
3753 * This is only used for regression testing and should not
3754 * be used while the array is active
3758 lseek64(bfd
, offset
- 4096, 0);
3759 if (read(bfd
, &bsb2
, 512) != 512)
3760 fail("cannot read bsb");
3761 if (bsb2
.sb_csum
!= bsb_csum((char*)&bsb2
,
3762 ((char*)&bsb2
.sb_csum
)-((char*)&bsb2
)))
3763 fail("first csum bad");
3764 if (memcmp(bsb2
.magic
, "md_backup_data", 14) != 0)
3765 fail("magic is bad");
3766 if (memcmp(bsb2
.magic
, "md_backup_data-2", 16) == 0 &&
3767 bsb2
.sb_csum2
!= bsb_csum((char*)&bsb2
,
3768 ((char*)&bsb2
.sb_csum2
)-((char*)&bsb2
)))
3769 fail("second csum bad");
3771 if (__le64_to_cpu(bsb2
.devstart
)*512 != offset
)
3772 fail("devstart is wrong");
3775 unsigned long long len
= __le64_to_cpu(bsb2
.length
)*512;
3777 if (abuflen
< len
) {
3781 if (posix_memalign((void**)&abuf
, 4096, abuflen
) ||
3782 posix_memalign((void**)&bbuf
, 4096, abuflen
)) {
3784 /* just stop validating on mem-alloc failure */
3789 lseek64(bfd
, offset
, 0);
3790 if ((unsigned long long)read(bfd
, bbuf
, len
) != len
) {
3791 //printf("len %llu\n", len);
3792 fail("read first backup failed");
3794 lseek64(afd
, __le64_to_cpu(bsb2
.arraystart
)*512, 0);
3795 if ((unsigned long long)read(afd
, abuf
, len
) != len
)
3796 fail("read first from array failed");
3797 if (memcmp(bbuf
, abuf
, len
) != 0) {
3800 printf("offset=%llu len=%llu\n",
3801 (unsigned long long)__le64_to_cpu(bsb2
.arraystart
)*512, len
);
3802 for (i
=0; i
<len
; i
++)
3803 if (bbuf
[i
] != abuf
[i
]) {
3804 printf("first diff byte %d\n", i
);
3808 fail("data1 compare failed");
3812 unsigned long long len
= __le64_to_cpu(bsb2
.length2
)*512;
3814 if (abuflen
< len
) {
3818 abuf
= xmalloc(abuflen
);
3819 bbuf
= xmalloc(abuflen
);
3822 lseek64(bfd
, offset
+__le64_to_cpu(bsb2
.devstart2
)*512, 0);
3823 if ((unsigned long long)read(bfd
, bbuf
, len
) != len
)
3824 fail("read second backup failed");
3825 lseek64(afd
, __le64_to_cpu(bsb2
.arraystart2
)*512, 0);
3826 if ((unsigned long long)read(afd
, abuf
, len
) != len
)
3827 fail("read second from array failed");
3828 if (memcmp(bbuf
, abuf
, len
) != 0)
3829 fail("data2 compare failed");
3833 int child_monitor(int afd
, struct mdinfo
*sra
, struct reshape
*reshape
,
3834 struct supertype
*st
, unsigned long blocks
,
3835 int *fds
, unsigned long long *offsets
,
3836 int dests
, int *destfd
, unsigned long long *destoffsets
)
3838 /* Monitor a reshape where backup is being performed using
3839 * 'native' mechanism - either to a backup file, or
3840 * to some space in a spare.
3844 unsigned long long speed
;
3845 unsigned long long suspend_point
, array_size
;
3846 unsigned long long backup_point
, wait_point
;
3847 unsigned long long reshape_completed
;
3849 int increasing
= reshape
->after
.data_disks
>= reshape
->before
.data_disks
;
3850 int part
= 0; /* The next part of the backup area to fill. It may already
3851 * be full, so we need to check */
3852 int level
= reshape
->level
;
3853 int layout
= reshape
->before
.layout
;
3854 int data
= reshape
->before
.data_disks
;
3855 int disks
= reshape
->before
.data_disks
+ reshape
->parity
;
3856 int chunk
= sra
->array
.chunk_size
;
3858 unsigned long stripes
;
3861 /* set up the backup-super-block. This requires the
3862 * uuid from the array.
3864 /* Find a superblock */
3865 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
3869 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
3871 dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 1);
3872 devfd
= dev_open(dn
, O_RDONLY
);
3875 ok
= st
->ss
->load_super(st
, devfd
, NULL
);
3881 pr_err("Cannot find a superblock\n");
3885 memset(&bsb
, 0, 512);
3886 memcpy(bsb
.magic
, "md_backup_data-1", 16);
3887 st
->ss
->uuid_from_super(st
, uuid
);
3888 memcpy(bsb
.set_uuid
, uuid
, 16);
3889 bsb
.mtime
= __cpu_to_le64(time(0));
3890 bsb
.devstart2
= blocks
;
3892 stripes
= blocks
/ (sra
->array
.chunk_size
/512) /
3893 reshape
->before
.data_disks
;
3895 if (posix_memalign((void**)&buf
, 4096, disks
* chunk
))
3896 /* Don't start the 'reshape' */
3898 if (reshape
->before
.data_disks
== reshape
->after
.data_disks
) {
3899 sysfs_get_ll(sra
, NULL
, "sync_speed_min", &speed
);
3900 sysfs_set_num(sra
, NULL
, "sync_speed_min", 200000);
3904 array_size
= sra
->component_size
* reshape
->after
.data_disks
;
3905 backup_point
= sra
->reshape_progress
;
3908 array_size
= sra
->component_size
* reshape
->before
.data_disks
;
3909 backup_point
= reshape
->backup_blocks
;
3910 suspend_point
= array_size
;
3916 /* Want to return as soon the oldest backup slot can
3917 * be released as that allows us to start backing up
3918 * some more, providing suspend_point has been
3919 * advanced, which it should have.
3922 wait_point
= array_size
;
3923 if (part
== 0 && __le64_to_cpu(bsb
.length
) > 0)
3924 wait_point
= (__le64_to_cpu(bsb
.arraystart
) +
3925 __le64_to_cpu(bsb
.length
));
3926 if (part
== 1 && __le64_to_cpu(bsb
.length2
) > 0)
3927 wait_point
= (__le64_to_cpu(bsb
.arraystart2
) +
3928 __le64_to_cpu(bsb
.length2
));
3931 if (part
== 0 && __le64_to_cpu(bsb
.length
) > 0)
3932 wait_point
= __le64_to_cpu(bsb
.arraystart
);
3933 if (part
== 1 && __le64_to_cpu(bsb
.length2
) > 0)
3934 wait_point
= __le64_to_cpu(bsb
.arraystart2
);
3937 rv
= progress_reshape(sra
, reshape
,
3938 backup_point
, wait_point
,
3939 &suspend_point
, &reshape_completed
);
3940 /* external metadata would need to ping_monitor here */
3941 sra
->reshape_progress
= reshape_completed
;
3943 /* Clear any backup region that is before 'here' */
3945 if (__le64_to_cpu(bsb
.length
) > 0 &&
3946 reshape_completed
>= (__le64_to_cpu(bsb
.arraystart
) +
3947 __le64_to_cpu(bsb
.length
)))
3948 forget_backup(dests
, destfd
,
3950 if (__le64_to_cpu(bsb
.length2
) > 0 &&
3951 reshape_completed
>= (__le64_to_cpu(bsb
.arraystart2
) +
3952 __le64_to_cpu(bsb
.length2
)))
3953 forget_backup(dests
, destfd
,
3956 if (__le64_to_cpu(bsb
.length
) > 0 &&
3957 reshape_completed
<= (__le64_to_cpu(bsb
.arraystart
)))
3958 forget_backup(dests
, destfd
,
3960 if (__le64_to_cpu(bsb
.length2
) > 0 &&
3961 reshape_completed
<= (__le64_to_cpu(bsb
.arraystart2
)))
3962 forget_backup(dests
, destfd
,
3971 if (rv
== 0 && increasing
&& !st
->ss
->external
) {
3972 /* No longer need to monitor this reshape */
3978 unsigned long long offset
;
3979 unsigned long actual_stripes
;
3980 /* Need to backup some data.
3981 * If 'part' is not used and the desired
3982 * backup size is suspended, do a backup,
3983 * then consider the next part.
3985 /* Check that 'part' is unused */
3986 if (part
== 0 && __le64_to_cpu(bsb
.length
) != 0)
3988 if (part
== 1 && __le64_to_cpu(bsb
.length2
) != 0)
3991 offset
= backup_point
/ data
;
3992 actual_stripes
= stripes
;
3994 if (offset
+ actual_stripes
* (chunk
/512) >
3995 sra
->component_size
)
3996 actual_stripes
= ((sra
->component_size
- offset
)
3998 if (offset
+ actual_stripes
* (chunk
/512) >
4002 if (offset
< actual_stripes
* (chunk
/512))
4003 actual_stripes
= offset
/ (chunk
/512);
4004 offset
-= actual_stripes
* (chunk
/512);
4005 if (offset
< suspend_point
/data
)
4008 if (actual_stripes
== 0)
4010 grow_backup(sra
, offset
, actual_stripes
,
4012 disks
, chunk
, level
, layout
,
4013 dests
, destfd
, destoffsets
,
4014 part
, °raded
, buf
);
4015 validate(afd
, destfd
[0], destoffsets
[0]);
4016 /* record where 'part' is up to */
4019 backup_point
+= actual_stripes
* (chunk
/512) * data
;
4021 backup_point
-= actual_stripes
* (chunk
/512) * data
;
4025 /* FIXME maybe call progress_reshape one more time instead */
4026 abort_reshape(sra
); /* remove any remaining suspension */
4027 if (reshape
->before
.data_disks
== reshape
->after
.data_disks
)
4028 sysfs_set_num(sra
, NULL
, "sync_speed_min", speed
);
4034 * If any spare contains md_back_data-1 which is recent wrt mtime,
4035 * write that data into the array and update the super blocks with
4036 * the new reshape_progress
4038 int Grow_restart(struct supertype
*st
, struct mdinfo
*info
, int *fdlist
, int cnt
,
4039 char *backup_file
, int verbose
)
4043 unsigned long long *offsets
;
4044 unsigned long long nstripe
, ostripe
;
4047 odata
= info
->array
.raid_disks
- info
->delta_disks
- 1;
4048 if (info
->array
.level
== 6) odata
--; /* number of data disks */
4049 ndata
= info
->array
.raid_disks
- 1;
4050 if (info
->new_level
== 6) ndata
--;
4052 old_disks
= info
->array
.raid_disks
- info
->delta_disks
;
4054 if (info
->delta_disks
<= 0)
4055 /* Didn't grow, so the backup file must have
4059 for (i
=old_disks
-(backup_file
?1:0); i
<cnt
; i
++) {
4060 struct mdinfo dinfo
;
4063 char *devname
, namebuf
[20];
4064 unsigned long long lo
, hi
;
4066 /* This was a spare and may have some saved data on it.
4067 * Load the superblock, find and load the
4068 * backup_super_block.
4069 * If either fail, go on to next device.
4070 * If the backup contains no new info, just return
4071 * else restore data and update all superblocks
4073 if (i
== old_disks
-1) {
4074 fd
= open(backup_file
, O_RDONLY
);
4076 pr_err("backup file %s inaccessible: %s\n",
4077 backup_file
, strerror(errno
));
4080 devname
= backup_file
;
4085 if (st
->ss
->load_super(st
, fd
, NULL
))
4088 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
4089 st
->ss
->free_super(st
);
4092 (dinfo
.data_offset
+ dinfo
.component_size
- 8) <<9,
4094 pr_err("Cannot seek on device %d\n", i
);
4095 continue; /* Cannot seek */
4097 sprintf(namebuf
, "device-%d", i
);
4100 if (read(fd
, &bsb
, sizeof(bsb
)) != sizeof(bsb
)) {
4102 pr_err("Cannot read from %s\n", devname
);
4103 continue; /* Cannot read */
4105 if (memcmp(bsb
.magic
, "md_backup_data-1", 16) != 0 &&
4106 memcmp(bsb
.magic
, "md_backup_data-2", 16) != 0) {
4108 pr_err("No backup metadata on %s\n", devname
);
4111 if (bsb
.sb_csum
!= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
))) {
4113 pr_err("Bad backup-metadata checksum on %s\n", devname
);
4114 continue; /* bad checksum */
4116 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0 &&
4117 bsb
.sb_csum2
!= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum2
)-((char*)&bsb
))) {
4119 pr_err("Bad backup-metadata checksum2 on %s\n", devname
);
4120 continue; /* Bad second checksum */
4122 if (memcmp(bsb
.set_uuid
,info
->uuid
, 16) != 0) {
4124 pr_err("Wrong uuid on backup-metadata on %s\n", devname
);
4125 continue; /* Wrong uuid */
4128 /* array utime and backup-mtime should be updated at much the same time, but it seems that
4129 * sometimes they aren't... So allow considerable flexability in matching, and allow
4130 * this test to be overridden by an environment variable.
4132 if (info
->array
.utime
> (int)__le64_to_cpu(bsb
.mtime
) + 2*60*60 ||
4133 info
->array
.utime
< (int)__le64_to_cpu(bsb
.mtime
) - 10*60) {
4134 if (check_env("MDADM_GROW_ALLOW_OLD")) {
4135 pr_err("accepting backup with timestamp %lu "
4136 "for array with timestamp %lu\n",
4137 (unsigned long)__le64_to_cpu(bsb
.mtime
),
4138 (unsigned long)info
->array
.utime
);
4140 pr_err("too-old timestamp on backup-metadata on %s\n", devname
);
4141 pr_err("If you think it is should be safe, try 'export MDADM_GROW_ALLOW_OLD=1'\n");
4142 continue; /* time stamp is too bad */
4146 if (bsb
.magic
[15] == '1') {
4147 if (bsb
.length
== 0)
4149 if (info
->delta_disks
>= 0) {
4150 /* reshape_progress is increasing */
4151 if (__le64_to_cpu(bsb
.arraystart
)
4152 + __le64_to_cpu(bsb
.length
)
4153 < info
->reshape_progress
) {
4156 pr_err("backup-metadata found on %s but is not needed\n", devname
);
4157 continue; /* No new data here */
4160 /* reshape_progress is decreasing */
4161 if (__le64_to_cpu(bsb
.arraystart
) >=
4162 info
->reshape_progress
)
4163 goto nonew
; /* No new data here */
4166 if (bsb
.length
== 0 && bsb
.length2
== 0)
4168 if (info
->delta_disks
>= 0) {
4169 /* reshape_progress is increasing */
4170 if ((__le64_to_cpu(bsb
.arraystart
)
4171 + __le64_to_cpu(bsb
.length
)
4172 < info
->reshape_progress
)
4174 (__le64_to_cpu(bsb
.arraystart2
)
4175 + __le64_to_cpu(bsb
.length2
)
4176 < info
->reshape_progress
))
4177 goto nonew
; /* No new data here */
4179 /* reshape_progress is decreasing */
4180 if (__le64_to_cpu(bsb
.arraystart
) >=
4181 info
->reshape_progress
&&
4182 __le64_to_cpu(bsb
.arraystart2
) >=
4183 info
->reshape_progress
)
4184 goto nonew
; /* No new data here */
4187 if (lseek64(fd
, __le64_to_cpu(bsb
.devstart
)*512, 0)< 0) {
4190 pr_err("Failed to verify secondary backup-metadata block on %s\n",
4192 continue; /* Cannot seek */
4194 /* There should be a duplicate backup superblock 4k before here */
4195 if (lseek64(fd
, -4096, 1) < 0 ||
4196 read(fd
, &bsb2
, sizeof(bsb2
)) != sizeof(bsb2
))
4197 goto second_fail
; /* Cannot find leading superblock */
4198 if (bsb
.magic
[15] == '1')
4199 bsbsize
= offsetof(struct mdp_backup_super
, pad1
);
4201 bsbsize
= offsetof(struct mdp_backup_super
, pad
);
4202 if (memcmp(&bsb2
, &bsb
, bsbsize
) != 0)
4203 goto second_fail
; /* Cannot find leading superblock */
4205 /* Now need the data offsets for all devices. */
4206 offsets
= xmalloc(sizeof(*offsets
)*info
->array
.raid_disks
);
4207 for(j
=0; j
<info
->array
.raid_disks
; j
++) {
4210 if (st
->ss
->load_super(st
, fdlist
[j
], NULL
))
4211 /* FIXME should be this be an error */
4213 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
4214 st
->ss
->free_super(st
);
4215 offsets
[j
] = dinfo
.data_offset
* 512;
4217 printf(Name
": restoring critical section\n");
4219 if (restore_stripes(fdlist
, offsets
,
4220 info
->array
.raid_disks
,
4224 fd
, __le64_to_cpu(bsb
.devstart
)*512,
4225 __le64_to_cpu(bsb
.arraystart
)*512,
4226 __le64_to_cpu(bsb
.length
)*512, NULL
)) {
4227 /* didn't succeed, so giveup */
4229 pr_err("Error restoring backup from %s\n",
4235 if (bsb
.magic
[15] == '2' &&
4236 restore_stripes(fdlist
, offsets
,
4237 info
->array
.raid_disks
,
4241 fd
, __le64_to_cpu(bsb
.devstart
)*512 +
4242 __le64_to_cpu(bsb
.devstart2
)*512,
4243 __le64_to_cpu(bsb
.arraystart2
)*512,
4244 __le64_to_cpu(bsb
.length2
)*512, NULL
)) {
4245 /* didn't succeed, so giveup */
4247 pr_err("Error restoring second backup from %s\n",
4255 /* Ok, so the data is restored. Let's update those superblocks. */
4259 lo
= __le64_to_cpu(bsb
.arraystart
);
4260 hi
= lo
+ __le64_to_cpu(bsb
.length
);
4262 if (bsb
.magic
[15] == '2' && bsb
.length2
) {
4263 unsigned long long lo1
, hi1
;
4264 lo1
= __le64_to_cpu(bsb
.arraystart2
);
4265 hi1
= lo1
+ __le64_to_cpu(bsb
.length2
);
4269 } else if (lo
< lo1
)
4275 (info
->reshape_progress
< lo
||
4276 info
->reshape_progress
> hi
))
4277 /* backup does not affect reshape_progress*/ ;
4278 else if (info
->delta_disks
>= 0) {
4279 info
->reshape_progress
= __le64_to_cpu(bsb
.arraystart
) +
4280 __le64_to_cpu(bsb
.length
);
4281 if (bsb
.magic
[15] == '2') {
4282 unsigned long long p2
= __le64_to_cpu(bsb
.arraystart2
) +
4283 __le64_to_cpu(bsb
.length2
);
4284 if (p2
> info
->reshape_progress
)
4285 info
->reshape_progress
= p2
;
4288 info
->reshape_progress
= __le64_to_cpu(bsb
.arraystart
);
4289 if (bsb
.magic
[15] == '2') {
4290 unsigned long long p2
= __le64_to_cpu(bsb
.arraystart2
);
4291 if (p2
< info
->reshape_progress
)
4292 info
->reshape_progress
= p2
;
4295 for (j
=0; j
<info
->array
.raid_disks
; j
++) {
4298 if (st
->ss
->load_super(st
, fdlist
[j
], NULL
))
4300 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
4301 dinfo
.reshape_progress
= info
->reshape_progress
;
4302 st
->ss
->update_super(st
, &dinfo
,
4303 "_reshape_progress",
4305 st
->ss
->store_super(st
, fdlist
[j
]);
4306 st
->ss
->free_super(st
);
4310 /* Didn't find any backup data, try to see if any
4313 if (info
->delta_disks
< 0) {
4314 /* When shrinking, the critical section is at the end.
4315 * So see if we are before the critical section.
4317 unsigned long long first_block
;
4318 nstripe
= ostripe
= 0;
4320 while (ostripe
>= nstripe
) {
4321 ostripe
+= info
->array
.chunk_size
/ 512;
4322 first_block
= ostripe
* odata
;
4323 nstripe
= first_block
/ ndata
/ (info
->new_chunk
/512) *
4324 (info
->new_chunk
/512);
4327 if (info
->reshape_progress
>= first_block
)
4330 if (info
->delta_disks
> 0) {
4331 /* See if we are beyond the critical section. */
4332 unsigned long long last_block
;
4333 nstripe
= ostripe
= 0;
4335 while (nstripe
>= ostripe
) {
4336 nstripe
+= info
->new_chunk
/ 512;
4337 last_block
= nstripe
* ndata
;
4338 ostripe
= last_block
/ odata
/ (info
->array
.chunk_size
/512) *
4339 (info
->array
.chunk_size
/512);
4342 if (info
->reshape_progress
>= last_block
)
4345 /* needed to recover critical section! */
4347 pr_err("Failed to find backup of critical section\n");
4351 int Grow_continue_command(char *devname
, int fd
,
4352 char *backup_file
, int verbose
)
4355 struct supertype
*st
= NULL
;
4356 struct mdinfo
*content
= NULL
;
4357 struct mdinfo array
;
4358 char *subarray
= NULL
;
4359 struct mdinfo
*cc
= NULL
;
4360 struct mdstat_ent
*mdstat
= NULL
;
4365 dprintf("Grow continue from command line called for %s\n",
4368 st
= super_by_fd(fd
, &subarray
);
4369 if (!st
|| !st
->ss
) {
4370 pr_err("Unable to determine metadata format for %s\n",
4374 dprintf("Grow continue is run for ");
4375 if (st
->ss
->external
== 0) {
4377 dprintf("native array (%s)\n", devname
);
4378 if (ioctl(fd
, GET_ARRAY_INFO
, &array
.array
) < 0) {
4379 pr_err("%s is not an active md array -"
4380 " aborting\n", devname
);
4382 goto Grow_continue_command_exit
;
4385 /* Need to load a superblock.
4386 * FIXME we should really get what we need from
4389 for (d
= 0; d
< MAX_DISKS
; d
++) {
4390 mdu_disk_info_t disk
;
4394 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
4396 if (disk
.major
== 0 && disk
.minor
== 0)
4398 if ((disk
.state
& (1 << MD_DISK_ACTIVE
)) == 0)
4400 dv
= map_dev(disk
.major
, disk
.minor
, 1);
4403 fd2
= dev_open(dv
, O_RDONLY
);
4406 err
= st
->ss
->load_super(st
, fd2
, NULL
);
4412 if (d
== MAX_DISKS
) {
4413 pr_err("Unable to load metadata for %s\n",
4416 goto Grow_continue_command_exit
;
4418 st
->ss
->getinfo_super(st
, content
, NULL
);
4423 dprintf("subarray (%s)\n", subarray
);
4424 container_dev
= st
->container_dev
;
4425 cfd
= open_dev_excl(st
->container_dev
);
4427 container_dev
= st
->devnum
;
4429 cfd
= open_dev_excl(st
->devnum
);
4430 dprintf("container (%i)\n", container_dev
);
4434 pr_err("Unable to open container "
4435 "for %s\n", devname
);
4437 goto Grow_continue_command_exit
;
4439 fmt_devname(buf
, container_dev
);
4441 /* find in container array under reshape
4443 ret_val
= st
->ss
->load_container(st
, cfd
, NULL
);
4445 pr_err("Cannot read superblock for %s\n",
4448 goto Grow_continue_command_exit
;
4451 cc
= st
->ss
->container_content(st
, subarray
);
4452 for (content
= cc
; content
; content
= content
->next
) {
4454 int allow_reshape
= 1;
4456 if (content
->reshape_active
== 0)
4458 /* The decision about array or container wide
4459 * reshape is taken in Grow_continue based
4460 * content->reshape_active state, therefore we
4461 * need to check_reshape based on
4462 * reshape_active and subarray name
4464 if (content
->array
.state
& (1<<MD_SB_BLOCK_VOLUME
))
4466 if (content
->reshape_active
== CONTAINER_RESHAPE
&&
4467 (content
->array
.state
4468 & (1<<MD_SB_BLOCK_CONTAINER_RESHAPE
)))
4471 if (!allow_reshape
) {
4472 pr_err("cannot continue reshape of an array"
4473 " in container with unsupported"
4474 " metadata: %s(%s)\n",
4477 goto Grow_continue_command_exit
;
4480 array
= strchr(content
->text_version
+1, '/')+1;
4481 mdstat
= mdstat_by_subdev(array
, container_dev
);
4484 if (mdstat
->active
== 0) {
4485 pr_err("Skipping inactive "
4486 "array md%i.\n", mdstat
->devnum
);
4487 free_mdstat(mdstat
);
4494 pr_err("Unable to determine reshaped "
4495 "array for %s\n", devname
);
4497 goto Grow_continue_command_exit
;
4499 fd2
= open_dev(mdstat
->devnum
);
4501 pr_err("cannot open (md%i)\n",
4504 goto Grow_continue_command_exit
;
4507 sysfs_init(content
, fd2
, mdstat
->devnum
);
4509 /* start mdmon in case it is not running
4511 if (!mdmon_running(container_dev
))
4512 start_mdmon(container_dev
);
4515 if (mdmon_running(container_dev
))
4516 st
->update_tail
= &st
->updates
;
4518 pr_err("No mdmon found. "
4519 "Grow cannot continue.\n");
4521 goto Grow_continue_command_exit
;
4525 /* verify that array under reshape is started from
4528 if (verify_reshape_position(content
, content
->array
.level
) < 0) {
4530 goto Grow_continue_command_exit
;
4535 ret_val
= Grow_continue(fd
, st
, content
, backup_file
, 0);
4537 Grow_continue_command_exit
:
4542 st
->ss
->free_super(st
);
4543 free_mdstat(mdstat
);
4550 int Grow_continue(int mdfd
, struct supertype
*st
, struct mdinfo
*info
,
4551 char *backup_file
, int freeze_reshape
)
4555 if (!info
->reshape_active
)
4558 if (st
->ss
->external
) {
4560 int cfd
= open_dev(st
->container_dev
);
4565 fmt_devname(container
, st
->container_dev
);
4566 st
->ss
->load_container(st
, cfd
, container
);
4568 ret_val
= reshape_container(container
, NULL
, mdfd
,
4569 st
, info
, 0, backup_file
,
4570 0, 1, freeze_reshape
);
4572 ret_val
= reshape_array(NULL
, mdfd
, "array", st
, info
, 1,
4573 NULL
, 0ULL, backup_file
, 0, 0, 1,