2 * mdadm - manage Linux "md" devices aka RAID arrays.
4 * Copyright (C) 2001-2009 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 Grow_Add_device(char *devname
, int fd
, char *newdev
)
40 /* Add a device to an active array.
41 * Currently, just extend a linear array.
42 * This requires writing a new superblock on the
43 * new device, calling the kernel to add the device,
44 * and if that succeeds, update the superblock on
46 * This means that we need to *find* all other devices.
53 struct supertype
*st
= NULL
;
54 char *subarray
= NULL
;
56 if (ioctl(fd
, GET_ARRAY_INFO
, &info
.array
) < 0) {
57 fprintf(stderr
, Name
": cannot get array info for %s\n", devname
);
61 if (info
.array
.level
!= -1) {
62 fprintf(stderr
, Name
": can only add devices to linear arrays\n");
66 st
= super_by_fd(fd
, &subarray
);
68 fprintf(stderr
, Name
": cannot handle arrays with superblock version %d\n", info
.array
.major_version
);
73 fprintf(stderr
, Name
": Cannot grow linear sub-arrays yet\n");
78 nfd
= open(newdev
, O_RDWR
|O_EXCL
|O_DIRECT
);
80 fprintf(stderr
, Name
": cannot open %s\n", newdev
);
85 if ((stb
.st_mode
& S_IFMT
) != S_IFBLK
) {
86 fprintf(stderr
, Name
": %s is not a block device!\n", newdev
);
91 /* now check out all the devices and make sure we can read the superblock */
92 for (d
=0 ; d
< info
.array
.raid_disks
; d
++) {
96 st
->ss
->free_super(st
);
99 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0) {
100 fprintf(stderr
, Name
": cannot get device detail for device %d\n",
106 dv
= map_dev(disk
.major
, disk
.minor
, 1);
108 fprintf(stderr
, Name
": cannot find device file for device %d\n",
114 fd2
= dev_open(dv
, O_RDWR
);
116 fprintf(stderr
, Name
": cannot open device file %s\n", dv
);
122 if (st
->ss
->load_super(st
, fd2
, NULL
)) {
123 fprintf(stderr
, Name
": cannot find super block on %s\n", dv
);
131 /* Ok, looks good. Lets update the superblock and write it out to
135 info
.disk
.number
= d
;
136 info
.disk
.major
= major(stb
.st_rdev
);
137 info
.disk
.minor
= minor(stb
.st_rdev
);
138 info
.disk
.raid_disk
= d
;
139 info
.disk
.state
= (1 << MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
);
140 st
->ss
->update_super(st
, &info
, "linear-grow-new", newdev
,
143 if (st
->ss
->store_super(st
, nfd
)) {
144 fprintf(stderr
, Name
": Cannot store new superblock on %s\n",
151 if (ioctl(fd
, ADD_NEW_DISK
, &info
.disk
) != 0) {
152 fprintf(stderr
, Name
": Cannot add new disk to this array\n");
155 /* Well, that seems to have worked.
156 * Now go through and update all superblocks
159 if (ioctl(fd
, GET_ARRAY_INFO
, &info
.array
) < 0) {
160 fprintf(stderr
, Name
": cannot get array info for %s\n", devname
);
165 for (d
=0 ; d
< info
.array
.raid_disks
; d
++) {
166 mdu_disk_info_t disk
;
170 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0) {
171 fprintf(stderr
, Name
": cannot get device detail for device %d\n",
175 dv
= map_dev(disk
.major
, disk
.minor
, 1);
177 fprintf(stderr
, Name
": cannot find device file for device %d\n",
181 fd2
= dev_open(dv
, O_RDWR
);
183 fprintf(stderr
, Name
": cannot open device file %s\n", dv
);
186 if (st
->ss
->load_super(st
, fd2
, NULL
)) {
187 fprintf(stderr
, Name
": cannot find super block on %s\n", dv
);
191 info
.array
.raid_disks
= nd
+1;
192 info
.array
.nr_disks
= nd
+1;
193 info
.array
.active_disks
= nd
+1;
194 info
.array
.working_disks
= nd
+1;
196 st
->ss
->update_super(st
, &info
, "linear-grow-update", dv
,
199 if (st
->ss
->store_super(st
, fd2
)) {
200 fprintf(stderr
, Name
": Cannot store new superblock on %s\n", dv
);
210 int Grow_addbitmap(char *devname
, int fd
, char *file
, int chunk
, int delay
, int write_behind
, int force
)
213 * First check that array doesn't have a bitmap
214 * Then create the bitmap
217 * For internal bitmaps, we need to check the version,
218 * find all the active devices, and write the bitmap block
221 mdu_bitmap_file_t bmf
;
222 mdu_array_info_t array
;
223 struct supertype
*st
;
224 char *subarray
= NULL
;
225 int major
= BITMAP_MAJOR_HI
;
226 int vers
= md_get_version(fd
);
227 unsigned long long bitmapsize
, array_size
;
230 major
= BITMAP_MAJOR_HOSTENDIAN
;
232 fprintf(stderr
, Name
": Warning - bitmaps created on this kernel are not portable\n"
233 " between different architectured. Consider upgrading the Linux kernel.\n");
237 if (ioctl(fd
, GET_BITMAP_FILE
, &bmf
) != 0) {
239 fprintf(stderr
, Name
": Memory allocation failure.\n");
241 fprintf(stderr
, Name
": bitmaps not supported by this kernel.\n");
244 if (bmf
.pathname
[0]) {
245 if (strcmp(file
,"none")==0) {
246 if (ioctl(fd
, SET_BITMAP_FILE
, -1)!= 0) {
247 fprintf(stderr
, Name
": failed to remove bitmap %s\n",
253 fprintf(stderr
, Name
": %s already has a bitmap (%s)\n",
254 devname
, bmf
.pathname
);
257 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) != 0) {
258 fprintf(stderr
, Name
": cannot get array status for %s\n", devname
);
261 if (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)) {
262 if (strcmp(file
, "none")==0) {
263 array
.state
&= ~(1<<MD_SB_BITMAP_PRESENT
);
264 if (ioctl(fd
, SET_ARRAY_INFO
, &array
)!= 0) {
265 fprintf(stderr
, Name
": failed to remove internal bitmap.\n");
270 fprintf(stderr
, Name
": Internal bitmap already present on %s\n",
275 if (strcmp(file
, "none") == 0) {
276 fprintf(stderr
, Name
": no bitmap found on %s\n", devname
);
279 if (array
.level
<= 0) {
280 fprintf(stderr
, Name
": Bitmaps not meaningful with level %s\n",
281 map_num(pers
, array
.level
)?:"of this array");
284 bitmapsize
= array
.size
;
286 if (get_dev_size(fd
, NULL
, &array_size
) &&
287 array_size
> (0x7fffffffULL
<<9)) {
288 /* Array is big enough that we cannot trust array.size
289 * try other approaches
291 bitmapsize
= get_component_size(fd
);
293 if (bitmapsize
== 0) {
294 fprintf(stderr
, Name
": Cannot reliably determine size of array to create bitmap - sorry.\n");
298 if (array
.level
== 10) {
299 int ncopies
= (array
.layout
&255)*((array
.layout
>>8)&255);
300 bitmapsize
= bitmapsize
* array
.raid_disks
/ ncopies
;
303 st
= super_by_fd(fd
, &subarray
);
305 fprintf(stderr
, Name
": Cannot understand version %d.%d\n",
306 array
.major_version
, array
.minor_version
);
310 fprintf(stderr
, Name
": Cannot add bitmaps to sub-arrays yet\n");
315 if (strcmp(file
, "internal") == 0) {
317 if (st
->ss
->add_internal_bitmap
== NULL
) {
318 fprintf(stderr
, Name
": Internal bitmaps not supported "
319 "with %s metadata\n", st
->ss
->name
);
322 for (d
=0; d
< st
->max_devs
; d
++) {
323 mdu_disk_info_t disk
;
326 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
328 if (disk
.major
== 0 &&
331 if ((disk
.state
& (1<<MD_DISK_SYNC
))==0)
333 dv
= map_dev(disk
.major
, disk
.minor
, 1);
335 int fd2
= dev_open(dv
, O_RDWR
);
338 if (st
->ss
->load_super(st
, fd2
, NULL
)==0) {
339 if (st
->ss
->add_internal_bitmap(
341 &chunk
, delay
, write_behind
,
342 bitmapsize
, 0, major
)
344 st
->ss
->write_bitmap(st
, fd2
);
346 fprintf(stderr
, Name
": failed to create internal bitmap - chunksize problem.\n");
354 array
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
355 if (ioctl(fd
, SET_ARRAY_INFO
, &array
)!= 0) {
356 fprintf(stderr
, Name
": failed to set internal bitmap.\n");
363 int max_devs
= st
->max_devs
;
365 /* try to load a superblock */
366 for (d
=0; d
<max_devs
; d
++) {
367 mdu_disk_info_t disk
;
371 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
373 if ((disk
.major
==0 && disk
.minor
==0) ||
374 (disk
.state
& (1<<MD_DISK_REMOVED
)))
376 dv
= map_dev(disk
.major
, disk
.minor
, 1);
378 fd2
= dev_open(dv
, O_RDONLY
);
380 st
->ss
->load_super(st
, fd2
, NULL
) == 0) {
382 st
->ss
->uuid_from_super(st
, uuid
);
388 fprintf(stderr
, Name
": cannot find UUID for array!\n");
391 if (CreateBitmap(file
, force
, (char*)uuid
, chunk
,
392 delay
, write_behind
, bitmapsize
, major
)) {
395 bitmap_fd
= open(file
, O_RDWR
);
397 fprintf(stderr
, Name
": weird: %s cannot be opened\n",
401 if (ioctl(fd
, SET_BITMAP_FILE
, bitmap_fd
) < 0) {
402 fprintf(stderr
, Name
": Cannot set bitmap file for %s: %s\n",
403 devname
, strerror(errno
));
413 * When reshaping an array we might need to backup some data.
414 * This is written to all spares with a 'super_block' describing it.
415 * The superblock goes 4K from the end of the used space on the
417 * It if written after the backup is complete.
418 * It has the following structure.
421 static struct mdp_backup_super
{
422 char magic
[16]; /* md_backup_data-1 or -2 */
425 /* start/sizes in 512byte sectors */
426 __u64 devstart
; /* address on backup device/file of data */
429 __u32 sb_csum
; /* csum of preceeding bytes. */
431 __u64 devstart2
; /* offset in to data of second section */
434 __u32 sb_csum2
; /* csum of preceeding bytes. */
436 } __attribute__((aligned(512))) bsb
, bsb2
;
438 static __u32
bsb_csum(char *buf
, int len
)
442 for (i
=0; i
<len
; i
++)
443 csum
= (csum
<<3) + buf
[0];
444 return __cpu_to_le32(csum
);
447 static int child_grow(int afd
, struct mdinfo
*sra
, unsigned long blocks
,
448 int *fds
, unsigned long long *offsets
,
449 int disks
, int chunk
, int level
, int layout
, int data
,
450 int dests
, int *destfd
, unsigned long long *destoffsets
);
451 static int child_shrink(int afd
, struct mdinfo
*sra
, unsigned long blocks
,
452 int *fds
, unsigned long long *offsets
,
453 int disks
, int chunk
, int level
, int layout
, int data
,
454 int dests
, int *destfd
, unsigned long long *destoffsets
);
455 static int child_same_size(int afd
, struct mdinfo
*sra
, unsigned long blocks
,
456 int *fds
, unsigned long long *offsets
,
457 unsigned long long start
,
458 int disks
, int chunk
, int level
, int layout
, int data
,
459 int dests
, int *destfd
, unsigned long long *destoffsets
);
461 static int freeze_container(struct supertype
*st
)
463 int container_dev
= (st
->container_dev
!= NoMdDev
464 ? st
->container_dev
: st
->devnum
);
465 char *container
= devnum2devname(container_dev
);
469 ": could not determine container name, freeze aborted\n");
473 if (block_monitor(container
, 1)) {
474 fprintf(stderr
, Name
": failed to freeze container\n");
481 static void unfreeze_container(struct supertype
*st
)
483 int container_dev
= (st
->container_dev
!= NoMdDev
484 ? st
->container_dev
: st
->devnum
);
485 char *container
= devnum2devname(container_dev
);
489 ": could not determine container name, unfreeze aborted\n");
493 unblock_monitor(container
, 1);
496 static int freeze(struct supertype
*st
)
498 /* Try to freeze resync/rebuild on this array/container.
499 * Return -1 if the array is busy,
500 * return -2 container cannot be frozen,
501 * return 0 if this kernel doesn't support 'frozen'
502 * return 1 if it worked.
504 if (st
->ss
->external
)
505 return freeze_container(st
);
507 struct mdinfo
*sra
= sysfs_read(-1, st
->devnum
, GET_VERSION
);
512 err
= sysfs_freeze_array(sra
);
518 static void unfreeze(struct supertype
*st
, int frozen
)
520 /* If 'frozen' is 1, unfreeze the array */
524 if (st
->ss
->external
)
525 return unfreeze_container(st
);
527 struct mdinfo
*sra
= sysfs_read(-1, st
->devnum
, GET_VERSION
);
530 sysfs_set_str(sra
, NULL
, "sync_action", "idle");
532 fprintf(stderr
, Name
": failed to unfreeze array\n");
537 static void wait_reshape(struct mdinfo
*sra
)
539 int fd
= sysfs_get_fd(sra
, NULL
, "sync_action");
546 select(fd
+1, NULL
, NULL
, &rfds
, NULL
);
548 if (sysfs_fd_get_str(fd
, action
, 20) < 0) {
552 } while (strncmp(action
, "reshape", 7) == 0);
555 static int reshape_super(struct supertype
*st
, long long size
, int level
,
556 int layout
, int chunksize
, int raid_disks
,
557 char *backup_file
, char *dev
, int verbose
)
559 /* nothing extra to check in the native case */
560 if (!st
->ss
->external
)
562 if (!st
->ss
->reshape_super
||
563 !st
->ss
->manage_reshape
) {
564 fprintf(stderr
, Name
": %s metadata does not support reshape\n",
569 return st
->ss
->reshape_super(st
, size
, level
, layout
, chunksize
,
570 raid_disks
, backup_file
, dev
, verbose
);
573 static void sync_metadata(struct supertype
*st
)
575 if (st
->ss
->external
) {
577 flush_metadata_updates(st
);
579 st
->ss
->sync_metadata(st
);
583 static int subarray_set_num(char *container
, struct mdinfo
*sra
, char *name
, int n
)
585 /* when dealing with external metadata subarrays we need to be
586 * prepared to handle EAGAIN. The kernel may need to wait for
587 * mdmon to mark the array active so the kernel can handle
588 * allocations/writeback when preparing the reshape action
589 * (md_allow_write()). We temporarily disable safe_mode_delay
590 * to close a race with the array_state going clean before the
591 * next write to raid_disks / stripe_cache_size
596 /* only 'raid_disks' and 'stripe_cache_size' trigger md_allow_write */
597 if (strcmp(name
, "raid_disks") != 0 &&
598 strcmp(name
, "stripe_cache_size") != 0)
599 return sysfs_set_num(sra
, NULL
, name
, n
);
601 rc
= sysfs_get_str(sra
, NULL
, "safe_mode_delay", safe
, sizeof(safe
));
604 sysfs_set_num(sra
, NULL
, "safe_mode_delay", 0);
605 rc
= sysfs_set_num(sra
, NULL
, name
, n
);
606 if (rc
< 0 && errno
== EAGAIN
) {
607 ping_monitor(container
);
608 /* if we get EAGAIN here then the monitor is not active
611 rc
= sysfs_set_num(sra
, NULL
, name
, n
);
613 sysfs_set_str(sra
, NULL
, "safe_mode_delay", safe
);
617 static int reshape_container_raid_disks(char *container
, int raid_disks
)
619 /* for each subarray switch to a raid level that can
620 * support the reshape, and set raid disks
622 struct mdstat_ent
*ent
, *e
;
623 int changed
= 0, rv
= 0, err
= 0;
625 ent
= mdstat_read(1, 0);
627 fprintf(stderr
, Name
": unable to read /proc/mdstat\n");
632 for (e
= ent
; e
; e
= e
->next
) {
635 int level
, takeover_delta
= 0;
637 if (!is_container_member(e
, container
))
640 level
= map_name(pers
, e
->level
);
642 sub
= sysfs_read(-1, e
->devnum
, GET_VERSION
);
645 /* metadata records 'orig_level' */
646 rv
= sysfs_set_num(sub
, NULL
, "level", 4);
651 /* we want spares to be used for capacity
652 * expansion, not rebuild
668 sub
= sysfs_read(-1, e
->devnum
, GET_CHUNK
|GET_CACHE
);
671 cache
= (sub
->array
.chunk_size
/ 4096) * 4;
672 if (cache
> sub
->cache_size
)
673 rv
= subarray_set_num(container
, sub
,
674 "stripe_cache_size", cache
);
682 sub
= sysfs_read(-1, e
->devnum
, GET_VERSION
);
686 rv
= subarray_set_num(container
, sub
, "raid_disks",
687 raid_disks
+ takeover_delta
);
701 ": failed to initiate container reshape%s%s\n",
702 err
? ": " : "", err
? strerror(err
) : "");
709 static void revert_container_raid_disks(struct supertype
*st
, int fd
, char *container
)
711 /* we failed to prepare all subarrays in the container for
712 * reshape, so cancel the changes and restore the nominal raid
715 struct mdstat_ent
*ent
, *e
;
717 ent
= mdstat_read(0, 0);
720 ": failed to read /proc/mdstat while aborting reshape\n");
724 if (st
->ss
->load_container(st
, fd
, NULL
)) {
726 ": failed read metadata while aborting reshape\n");
731 for (e
= ent
; e
; e
= e
->next
) {
732 int level_fixed
= 0, disks_fixed
= 0;
733 struct mdinfo
*sub
, *prev
;
736 if (!is_container_member(e
, container
))
739 subarray
= to_subarray(e
, container
);
740 prev
= st
->ss
->container_content(st
, subarray
);
742 /* changing level might change raid_disks so we do it
743 * first and then check if raid_disks still needs fixing
745 if (map_name(pers
, e
->level
) != prev
->array
.level
) {
746 sub
= sysfs_read(-1, e
->devnum
, GET_VERSION
);
748 !sysfs_set_num(sub
, NULL
, "level", prev
->array
.level
))
754 sub
= sysfs_read(-1, e
->devnum
, GET_DISKS
);
755 if (sub
&& sub
->array
.raid_disks
!= prev
->array
.raid_disks
) {
756 if (!subarray_set_num(container
, sub
, "raid_disks",
757 prev
->array
.raid_disks
))
763 if (!disks_fixed
|| !level_fixed
)
765 ": failed to restore %s to a %d-disk %s array\n",
766 e
->dev
, prev
->array
.raid_disks
,
767 map_num(pers
, prev
->array
.level
));
770 st
->ss
->free_super(st
);
774 int remove_disks_on_raid10_to_raid0_takeover(struct supertype
*st
,
779 struct mdinfo
*remaining
;
782 nr_of_copies
= layout
& 0xff;
784 remaining
= sra
->devs
;
786 /* for each 'copy', select one device and remove from the list. */
787 for (slot
= 0; slot
< sra
->array
.raid_disks
; slot
+= nr_of_copies
) {
788 struct mdinfo
**diskp
;
791 /* Find a working device to keep */
792 for (diskp
= &remaining
; *diskp
; diskp
= &(*diskp
)->next
) {
793 struct mdinfo
*disk
= *diskp
;
795 if (disk
->disk
.raid_disk
< slot
)
797 if (disk
->disk
.raid_disk
>= slot
+ nr_of_copies
)
799 if (disk
->disk
.state
& (1<<MD_DISK_REMOVED
))
801 if (disk
->disk
.state
& (1<<MD_DISK_FAULTY
))
803 if (!(disk
->disk
.state
& (1<<MD_DISK_SYNC
)))
806 /* We have found a good disk to use! */
808 disk
->next
= sra
->devs
;
817 if (slot
< sra
->array
.raid_disks
) {
818 /* didn't find all slots */
824 sra
->devs
= remaining
;
828 /* Remove all 'remaining' devices from the array */
830 struct mdinfo
*sd
= remaining
;
831 remaining
= sd
->next
;
833 sysfs_set_str(sra
, sd
, "state", "faulty");
834 sysfs_set_str(sra
, sd
, "slot", "none");
835 sysfs_set_str(sra
, sd
, "state", "remove");
836 sd
->disk
.state
|= (1<<MD_DISK_REMOVED
);
837 sd
->disk
.state
&= ~(1<<MD_DISK_SYNC
);
838 sd
->next
= sra
->devs
;
844 int Grow_reshape(char *devname
, int fd
, int quiet
, char *backup_file
,
846 int level
, char *layout_str
, int chunksize
, int raid_disks
)
848 /* Make some changes in the shape of an array.
849 * The kernel must support the change.
851 * There are three different changes. Each can trigger
852 * a resync or recovery so we freeze that until we have
853 * requested everything (if kernel supports freezing - 2.6.30).
855 * - change size (i.e. component_size)
857 * - change layout/chunksize/ndisks
859 * The last can require a reshape. It is different on different
860 * levels so we need to check the level before actioning it.
861 * Some times the level change needs to be requested after the
862 * reshape (e.g. raid6->raid5, raid5->raid0)
865 struct mdu_array_info_s array
, orig
;
868 struct supertype
*st
;
869 char *subarray
= NULL
;
872 int nlayout
, olayout
;
874 unsigned int ndata
, odata
;
875 int orig_level
= UnSet
;
878 unsigned long long *offsets
;
883 unsigned long a
,b
, blocks
, stripes
;
885 unsigned long long array_size
;
887 char *container
= NULL
;
894 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) < 0) {
895 fprintf(stderr
, Name
": %s is not an active md array - aborting\n",
901 (chunksize
|| level
!= UnSet
|| layout_str
|| raid_disks
)) {
902 fprintf(stderr
, Name
": cannot change component size at the same time "
903 "as other changes.\n"
904 " Change size first, then check data is intact before "
905 "making other changes.\n");
909 if (raid_disks
&& raid_disks
< array
.raid_disks
&& array
.level
> 1 &&
910 get_linux_version() < 2006032 &&
911 !check_env("MDADM_FORCE_FEWER")) {
912 fprintf(stderr
, Name
": reducing the number of devices is not safe before Linux 2.6.32\n"
913 " Please use a newer kernel\n");
917 st
= super_by_fd(fd
, &subarray
);
919 fprintf(stderr
, Name
": Unable to determine metadata format for %s\n", devname
);
923 /* in the external case we need to check that the requested reshape is
924 * supported, and perform an initial check that the container holds the
925 * pre-requisite spare devices (mdmon owns final validation)
927 if (st
->ss
->external
) {
932 container_dev
= st
->container_dev
;
933 cfd
= open_dev_excl(st
->container_dev
);
934 } else if (size
>= 0 || layout_str
!= NULL
|| chunksize
!= 0 ||
937 Name
": %s is a container, only 'raid-devices' can be changed\n",
941 container_dev
= st
->devnum
;
943 cfd
= open_dev_excl(st
->devnum
);
947 fprintf(stderr
, Name
": Unable to open container for %s\n",
953 container
= devnum2devname(st
->devnum
);
955 fprintf(stderr
, Name
": Could not determine container name\n");
961 rv
= st
->ss
->load_container(st
, cfd
, NULL
);
963 rv
= st
->ss
->load_super(st
, cfd
, NULL
);
965 fprintf(stderr
, Name
": Cannot read superblock for %s\n",
971 if (mdmon_running(container_dev
))
972 st
->update_tail
= &st
->updates
;
975 sra
= sysfs_read(fd
, 0, GET_LEVEL
| GET_DISKS
| GET_DEVS
| GET_STATE
);
977 if (st
->ss
->external
&& subarray
== NULL
) {
978 array
.level
= LEVEL_CONTAINER
;
979 sra
->array
.level
= LEVEL_CONTAINER
;
982 fprintf(stderr
, Name
": failed to read sysfs parameters for %s\n",
988 /* freeze() already spewed the reason */
990 } else if (frozen
< 0) {
991 fprintf(stderr
, Name
": %s is performing resync/recovery and cannot"
992 " be reshaped\n", devname
);
996 /* ========= set size =============== */
997 if (size
>= 0 && (size
== 0 || size
!= array
.size
)) {
998 long long orig_size
= array
.size
;
1000 if (reshape_super(st
, size
, UnSet
, UnSet
, 0, 0, NULL
, devname
, !quiet
)) {
1006 if (array
.size
!= size
) {
1007 /* got truncated to 32bit, write to
1008 * component_size instead
1011 rv
= sysfs_set_num(sra
, NULL
,
1012 "component_size", size
);
1016 rv
= ioctl(fd
, SET_ARRAY_INFO
, &array
);
1020 /* restore metadata */
1021 if (reshape_super(st
, orig_size
, UnSet
, UnSet
, 0, 0,
1022 NULL
, devname
, !quiet
) == 0)
1024 fprintf(stderr
, Name
": Cannot set device size for %s: %s\n",
1025 devname
, strerror(err
));
1027 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
1028 fprintf(stderr
, " Bitmap must be removed before size can be changed\n");
1032 ioctl(fd
, GET_ARRAY_INFO
, &array
);
1033 size
= get_component_size(fd
)/2;
1037 fprintf(stderr
, Name
": component size of %s has been set to %lluK\n",
1040 } else if (array
.level
!= LEVEL_CONTAINER
) {
1041 size
= get_component_size(fd
)/2;
1046 /* ========= check for Raid10 -> Raid0 conversion ===============
1047 * current implemenation assumes that following conditions must be met:
1049 * - near_copies == 2
1051 if (level
== 0 && array
.level
== 10 &&
1052 array
.layout
== ((1 << 8) + 2) && !(array
.raid_disks
& 1)) {
1054 err
= remove_disks_on_raid10_to_raid0_takeover(st
, sra
, array
.layout
);
1056 dprintf(Name
": Array cannot be reshaped\n");
1065 /* ======= set level =========== */
1066 if (level
!= UnSet
&& level
!= array
.level
) {
1067 /* Trying to change the level.
1068 * We might need to change layout first and schedule a
1069 * level change for later.
1070 * Level changes that can happen immediately are:
1071 * 0->4,5,6 1->5 4->5,6 5->1,6
1072 * Level changes that need a layout change first are:
1073 * 6->5,4,0 : need a -6 layout, or parity-last
1074 * 5->4,0 : need parity-last
1076 if ((array
.level
== 6 || array
.level
== 5) &&
1077 (level
== 5 || level
== 4 || level
== 0)) {
1078 /* Don't change level yet, but choose intermediate
1082 if (layout_str
== NULL
)
1083 switch (array
.layout
) {
1084 case ALGORITHM_LEFT_ASYMMETRIC
:
1085 case ALGORITHM_LEFT_ASYMMETRIC_6
:
1086 case ALGORITHM_ROTATING_N_RESTART
:
1087 layout_str
= "left-asymmetric-6";
1089 case ALGORITHM_LEFT_SYMMETRIC
:
1090 case ALGORITHM_LEFT_SYMMETRIC_6
:
1091 case ALGORITHM_ROTATING_N_CONTINUE
:
1092 layout_str
= "left-symmetric-6";
1094 case ALGORITHM_RIGHT_ASYMMETRIC
:
1095 case ALGORITHM_RIGHT_ASYMMETRIC_6
:
1096 case ALGORITHM_ROTATING_ZERO_RESTART
:
1097 layout_str
= "right-asymmetric-6";
1099 case ALGORITHM_RIGHT_SYMMETRIC
:
1100 case ALGORITHM_RIGHT_SYMMETRIC_6
:
1101 layout_str
= "right-symmetric-6";
1103 case ALGORITHM_PARITY_0
:
1104 case ALGORITHM_PARITY_0_6
:
1105 layout_str
= "parity-first-6";
1107 case ALGORITHM_PARITY_N
:
1108 layout_str
= "parity-last";
1111 fprintf(stderr
, Name
": %s: cannot"
1112 "convert layout to RAID5 equivalent\n",
1118 int l
= map_name(r5layout
, layout_str
);
1120 fprintf(stderr
, Name
": %s: layout '%s' not recognised\n",
1121 devname
, layout_str
);
1125 if (l
!= ALGORITHM_PARITY_N
) {
1126 /* need the -6 version */
1127 char *ls
= map_num(r5layout
, l
);
1128 strcat(strcpy(alt_layout
, ls
),
1130 layout_str
= alt_layout
;
1134 /* The final raid6->raid5 conversion
1135 * will reduce the number of disks,
1136 * so now we need to aim higher
1140 layout_str
= "parity-last";
1142 /* Level change is a simple takeover. In the external
1143 * case we don't check with the metadata handler until
1144 * we establish what the final layout will be. If the
1145 * level change is disallowed we will revert to
1146 * orig_level without disturbing the metadata, otherwise
1147 * we will send an update.
1149 c
= map_num(pers
, level
);
1151 rv
= 1;/* not possible */
1154 err
= sysfs_set_str(sra
, NULL
, "level", c
);
1157 fprintf(stderr
, Name
": %s: could not set level to %s\n",
1160 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
1161 fprintf(stderr
, " Bitmap must be removed before level can be changed\n");
1166 orig_level
= orig
.level
;
1167 ioctl(fd
, GET_ARRAY_INFO
, &array
);
1168 if (layout_str
== NULL
&&
1169 orig
.level
== 5 && level
== 6 &&
1170 array
.layout
!= orig
.layout
)
1171 layout_str
= map_num(r5layout
, orig
.layout
);
1173 fprintf(stderr
, Name
" level of %s changed to %s\n",
1179 /* ========= set shape (chunk_size / layout / ndisks) ============== */
1180 /* Check if layout change is a no-op */
1181 switch (array
.level
) {
1183 if (layout_str
&& array
.layout
== map_name(r5layout
, layout_str
))
1187 if (layout_str
== NULL
&&
1188 ((chunksize
&& chunksize
* 1024 != array
.chunk_size
) ||
1189 (raid_disks
&& raid_disks
!= array
.raid_disks
)) &&
1190 array
.layout
>= 16) {
1191 fprintf(stderr
, Name
1192 ": %s has a non-standard layout. If you wish to preserve this\n"
1193 " during the reshape, please specify --layout=preserve\n"
1194 " If you want to change it, specify a layout or use --layout=normalise\n",
1200 (strcmp(layout_str
, "normalise") == 0 ||
1201 strcmp(layout_str
, "normalize") == 0)) {
1203 strcpy(alt_layout
, map_num(r6layout
, array
.layout
));
1204 hyphen
= strrchr(alt_layout
, '-');
1205 if (hyphen
&& strcmp(hyphen
, "-6") == 0) {
1207 layout_str
= alt_layout
;
1211 if (layout_str
&& array
.layout
== map_name(r6layout
, layout_str
))
1213 if (layout_str
&& strcmp(layout_str
, "preserve") == 0)
1217 if (layout_str
== NULL
1218 && (chunksize
== 0 || chunksize
*1024 == array
.chunk_size
)
1219 && (raid_disks
== 0 || raid_disks
== array
.raid_disks
)) {
1220 if (reshape_super(st
, -1, level
, UnSet
, 0, 0, NULL
, devname
, !quiet
)) {
1226 if (level
!= UnSet
&& level
!= array
.level
) {
1227 /* Looks like this level change doesn't need
1228 * a reshape after all.
1230 c
= map_num(pers
, level
);
1232 rv
= sysfs_set_str(sra
, NULL
, "level", c
);
1235 fprintf(stderr
, Name
": %s: could not set level to %s\n",
1238 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
1239 fprintf(stderr
, " Bitmap must be removed before level can be changed\n");
1243 } else if (!changed
&& !quiet
)
1244 fprintf(stderr
, Name
": %s: no change requested\n",
1247 if (st
->ss
->external
&& !mdmon_running(st
->container_dev
) &&
1249 start_mdmon(st
->container_dev
);
1250 ping_monitor(container
);
1255 c
= map_num(pers
, array
.level
);
1256 if (c
== NULL
) c
= "-unknown-";
1257 switch (array
.level
) {
1258 default: /* raid0, linear, multipath cannot be reconfigured */
1259 fprintf(stderr
, Name
": %s array %s cannot be reshaped.\n",
1261 /* TODO raid0 raiddisks can be reshaped via raid4 */
1264 case LEVEL_CONTAINER
: {
1267 /* double check that we are not changing anything but raid_disks */
1268 if (size
>= 0 || layout_str
!= NULL
|| chunksize
!= 0 || level
!= UnSet
) {
1270 Name
": %s is a container, only 'raid-devices' can be changed\n",
1276 st
->update_tail
= &st
->updates
;
1277 if (reshape_super(st
, -1, UnSet
, UnSet
, 0, raid_disks
,
1278 backup_file
, devname
, !quiet
)) {
1283 count
= reshape_container_raid_disks(container
, raid_disks
);
1285 revert_container_raid_disks(st
, fd
, container
);
1288 } else if (count
== 0) {
1290 fprintf(stderr
, Name
1291 ": no active subarrays to reshape\n");
1295 if (!mdmon_running(st
->devnum
)) {
1296 start_mdmon(st
->devnum
);
1297 ping_monitor(container
);
1301 /* give mdmon a chance to allocate spares */
1302 ping_manager(container
);
1304 /* manage_reshape takes care of releasing the array(s) */
1305 st
->ss
->manage_reshape(st
, backup_file
);
1309 case LEVEL_FAULTY
: /* only 'layout' change is permitted */
1311 if (chunksize
|| raid_disks
) {
1312 fprintf(stderr
, Name
": %s: Cannot change chunksize or disks of a 'faulty' array\n",
1317 if (layout_str
== NULL
)
1318 break; /* nothing to do.... */
1320 array
.layout
= parse_layout_faulty(layout_str
);
1321 if (array
.layout
< 0) {
1322 fprintf(stderr
, Name
": %s: layout %s not understood for 'faulty' array\n",
1323 devname
, layout_str
);
1327 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
1328 fprintf(stderr
, Name
": Cannot set layout for %s: %s\n",
1329 devname
, strerror(errno
));
1332 printf("layout for %s set to %d\n", devname
, array
.layout
);
1335 case 1: /* only raid_disks can each be changed. */
1337 if (chunksize
|| layout_str
!= NULL
) {
1338 fprintf(stderr
, Name
": %s: Cannot change chunk size or layout for a RAID1 array.\n",
1343 if (raid_disks
> 0) {
1344 if (reshape_super(st
, -1, UnSet
, UnSet
, 0, raid_disks
,
1345 NULL
, devname
, !quiet
)) {
1350 array
.raid_disks
= raid_disks
;
1351 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
1352 fprintf(stderr
, Name
": Cannot set raid-devices for %s: %s\n",
1353 devname
, strerror(errno
));
1364 * layout/chunksize/raid_disks can be changed
1365 * though the kernel may not support it all.
1368 fprintf(stderr
, Name
": Cannot reshape subarrays yet\n");
1373 * There are three possibilities.
1374 * 1/ The array will shrink.
1375 * We need to ensure the reshape will pause before reaching
1376 * the 'critical section'. We also need to fork and wait for
1377 * that to happen. When it does we
1378 * suspend/backup/complete/unfreeze
1380 * 2/ The array will not change size.
1381 * This requires that we keep a backup of a sliding window
1382 * so that we can restore data after a crash. So we need
1383 * to fork and monitor progress.
1385 * 3/ The array will grow. This is relatively easy.
1386 * However the kernel's restripe routines will cheerfully
1387 * overwrite some early data before it is safe. So we
1388 * need to make a backup of the early parts of the array
1389 * and be ready to restore it if rebuild aborts very early.
1391 * We backup data by writing it to one spare, or to a
1392 * file which was given on command line.
1394 * [FOLLOWING IS OLD AND PARTLY WRONG]
1395 * So: we enumerate the devices in the array and
1396 * make sure we can open all of them.
1397 * Then we freeze the early part of the array and
1398 * backup to the various spares.
1399 * Then we request changes and start the reshape.
1400 * Monitor progress until it has passed the danger zone.
1401 * and finally invalidate the copied data and unfreeze the
1402 * start of the array.
1404 * In each case, we first make sure that storage is available
1405 * for the required backup.
1407 * - request the shape change.
1408 * - for to handle backup etc.
1410 nchunk
= ochunk
= array
.chunk_size
;
1411 nlayout
= olayout
= array
.layout
;
1412 ndisks
= odisks
= array
.raid_disks
;
1415 nchunk
= chunksize
* 1024;
1416 if (size
% chunksize
) {
1417 fprintf(stderr
, Name
": component size %lluK is not"
1418 " a multiple of chunksize %dK\n",
1423 if (layout_str
!= NULL
)
1424 switch(array
.level
) {
1425 case 4: /* ignore layout */
1428 nlayout
= map_name(r5layout
, layout_str
);
1429 if (nlayout
== UnSet
) {
1430 fprintf(stderr
, Name
": layout %s not understood for raid5.\n",
1438 nlayout
= map_name(r6layout
, layout_str
);
1439 if (nlayout
== UnSet
) {
1440 fprintf(stderr
, Name
": layout %s not understood for raid6.\n",
1447 if (raid_disks
) ndisks
= raid_disks
;
1451 if (array
.level
== 6) {
1452 odata
--; /* number of data disks */
1456 if (odata
== ndata
&&
1457 get_linux_version() < 2006032) {
1458 fprintf(stderr
, Name
": in-place reshape is not safe before 2.6.32, sorry.\n");
1462 /* Check that we can hold all the data */
1463 get_dev_size(fd
, NULL
, &array_size
);
1464 if (ndata
* (unsigned long long)size
< (array_size
/1024)) {
1465 fprintf(stderr
, Name
": this change will reduce the size of the array.\n"
1466 " use --grow --array-size first to truncate array.\n"
1467 " e.g. mdadm --grow %s --array-size %llu\n",
1468 devname
, ndata
* size
);
1473 /* So how much do we need to backup.
1474 * We need an amount of data which is both a whole number of
1475 * old stripes and a whole number of new stripes.
1476 * So LCM for (chunksize*datadisks).
1478 a
= (ochunk
/512) * odata
;
1479 b
= (nchunk
/512) * ndata
;
1487 /* LCM == product / GCD */
1488 blocks
= (ochunk
/512) * (nchunk
/512) * odata
* ndata
/ a
;
1491 sra
= sysfs_read(fd
, 0,
1492 GET_COMPONENT
|GET_DEVS
|GET_OFFSET
|GET_STATE
|
1496 fprintf(stderr
, Name
": %s: Cannot get array details from sysfs\n",
1502 if (ndata
== odata
) {
1503 /* Make 'blocks' bigger for better throughput, but
1504 * not so big that we reject it below.
1505 * Try for 16 megabytes
1507 while (blocks
* 32 < sra
->component_size
&&
1511 fprintf(stderr
, Name
": Need to backup %luK of critical "
1512 "section..\n", blocks
/2);
1514 if (blocks
>= sra
->component_size
/2) {
1515 fprintf(stderr
, Name
": %s: Something wrong - reshape aborted\n",
1520 nrdisks
= array
.raid_disks
+ sra
->array
.spare_disks
;
1521 /* Now we need to open all these devices so we can read/write.
1523 fdlist
= malloc((1+nrdisks
) * sizeof(int));
1524 offsets
= malloc((1+nrdisks
) * sizeof(offsets
[0]));
1525 if (!fdlist
|| !offsets
) {
1526 fprintf(stderr
, Name
": malloc failed: grow aborted\n");
1530 for (d
=0; d
<= nrdisks
; d
++)
1532 d
= array
.raid_disks
;
1533 for (sd
= sra
->devs
; sd
; sd
=sd
->next
) {
1534 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
1536 if (sd
->disk
.state
& (1<<MD_DISK_SYNC
)) {
1537 char *dn
= map_dev(sd
->disk
.major
,
1539 fdlist
[sd
->disk
.raid_disk
]
1540 = dev_open(dn
, O_RDONLY
);
1541 offsets
[sd
->disk
.raid_disk
] = sd
->data_offset
*512;
1542 if (fdlist
[sd
->disk
.raid_disk
] < 0) {
1543 fprintf(stderr
, Name
": %s: cannot open component %s\n",
1544 devname
, dn
?dn
:"-unknown-");
1548 } else if (backup_file
== NULL
) {
1550 char *dn
= map_dev(sd
->disk
.major
,
1552 fdlist
[d
] = dev_open(dn
, O_RDWR
);
1553 offsets
[d
] = (sd
->data_offset
+ sra
->component_size
- blocks
- 8)*512;
1555 fprintf(stderr
, Name
": %s: cannot open component %s\n",
1556 devname
, dn
?dn
:"-unknown");
1563 if (backup_file
== NULL
) {
1564 if (st
->ss
->external
&& !st
->ss
->manage_reshape
) {
1565 fprintf(stderr
, Name
": %s Grow operation not supported by %s metadata\n",
1566 devname
, st
->ss
->name
);
1570 if (ndata
<= odata
) {
1571 fprintf(stderr
, Name
": %s: Cannot grow - need backup-file\n",
1575 } else if (sra
->array
.spare_disks
== 0) {
1576 fprintf(stderr
, Name
": %s: Cannot grow - need a spare or "
1577 "backup-file to backup critical section\n",
1582 if (d
== array
.raid_disks
) {
1583 fprintf(stderr
, Name
": %s: No spare device for backup\n",
1589 /* need to check backup file is large enough */
1591 fdlist
[d
] = open(backup_file
, O_RDWR
|O_CREAT
|O_EXCL
,
1593 offsets
[d
] = 8 * 512;
1594 if (fdlist
[d
] < 0) {
1595 fprintf(stderr
, Name
": %s: cannot create backup file %s: %s\n",
1596 devname
, backup_file
, strerror(errno
));
1600 memset(buf
, 0, 512);
1601 for (i
=0; i
< (signed)blocks
+ 1 ; i
++) {
1602 if (write(fdlist
[d
], buf
, 512) != 512) {
1603 fprintf(stderr
, Name
": %s: cannot create backup file %s: %s\n",
1604 devname
, backup_file
, strerror(errno
));
1609 if (fsync(fdlist
[d
]) != 0) {
1610 fprintf(stderr
, Name
": %s: cannot create backup file %s: %s\n",
1611 devname
, backup_file
, strerror(errno
));
1618 /* check that the operation is supported by the metadata */
1619 if (reshape_super(st
, -1, level
, nlayout
, nchunk
, ndisks
,
1620 backup_file
, devname
, !quiet
)) {
1625 /* lastly, check that the internal stripe cache is
1626 * large enough, or it won't work.
1629 cache
= (nchunk
< ochunk
) ? ochunk
: nchunk
;
1630 cache
= cache
* 4 / 4096;
1631 if (cache
< blocks
/ 8 / odisks
+ 16)
1632 /* Make it big enough to hold 'blocks' */
1633 cache
= blocks
/ 8 / odisks
+ 16;
1634 if (sra
->cache_size
< cache
)
1635 sysfs_set_num(sra
, NULL
, "stripe_cache_size",
1637 /* Right, everything seems fine. Let's kick things off.
1638 * If only changing raid_disks, use ioctl, else use
1642 if (ochunk
== nchunk
&& olayout
== nlayout
) {
1643 array
.raid_disks
= ndisks
;
1644 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
1647 fprintf(stderr
, Name
": Cannot set device shape for %s: %s\n",
1648 devname
, strerror(errno
));
1649 if (ndisks
< odisks
&&
1650 get_linux_version() < 2006030)
1651 fprintf(stderr
, Name
": linux 2.6.30 or later required\n");
1653 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
1654 fprintf(stderr
, " Bitmap must be removed before shape can be changed\n");
1659 /* set them all just in case some old 'new_*' value
1660 * persists from some earlier problem
1662 int err
= err
; /* only used if rv==1, and always set if
1663 * rv==1, so initialisation not needed,
1664 * despite gcc warning
1666 if (sysfs_set_num(sra
, NULL
, "chunk_size", nchunk
) < 0)
1667 rv
= 1, err
= errno
;
1668 if (!rv
&& sysfs_set_num(sra
, NULL
, "layout", nlayout
) < 0)
1669 rv
= 1, err
= errno
;
1670 if (!rv
&& sysfs_set_num(sra
, NULL
, "raid_disks", ndisks
) < 0)
1671 rv
= 1, err
= errno
;
1673 fprintf(stderr
, Name
": Cannot set device shape for %s\n",
1675 if (get_linux_version() < 2006030)
1676 fprintf(stderr
, Name
": linux 2.6.30 or later required\n");
1678 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
1679 fprintf(stderr
, " Bitmap must be removed before shape can be changed\n");
1684 if (ndisks
== 2 && odisks
== 2) {
1685 /* No reshape is needed in this trivial case */
1690 if (st
->ss
->external
) {
1691 /* metadata handler takes it from here */
1692 ping_manager(container
);
1693 st
->ss
->manage_reshape(st
, backup_file
);
1698 /* set up the backup-super-block. This requires the
1699 * uuid from the array.
1701 /* Find a superblock */
1702 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
1706 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
1708 dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 1);
1709 devfd
= dev_open(dn
, O_RDONLY
);
1712 ok
= st
->ss
->load_super(st
, devfd
, NULL
);
1718 fprintf(stderr
, Name
": %s: Cannot find a superblock\n",
1724 memset(&bsb
, 0, 512);
1725 memcpy(bsb
.magic
, "md_backup_data-1", 16);
1726 st
->ss
->uuid_from_super(st
, (int*)&bsb
.set_uuid
);
1727 bsb
.mtime
= __cpu_to_le64(time(0));
1728 bsb
.devstart2
= blocks
;
1729 stripes
= blocks
/ (ochunk
/512) / odata
;
1730 /* Now we just need to kick off the reshape and watch, while
1731 * handling backups of the data...
1732 * This is all done by a forked background process.
1737 if (check_env("MDADM_GROW_VERIFY"))
1738 fd
= open(devname
, O_RDONLY
| O_DIRECT
);
1741 mlockall(MCL_FUTURE
);
1744 done
= child_grow(fd
, sra
, stripes
,
1746 odisks
, ochunk
, array
.level
, olayout
, odata
,
1747 d
- odisks
, fdlist
+odisks
, offsets
+odisks
);
1748 else if (odata
> ndata
)
1749 done
= child_shrink(fd
, sra
, stripes
,
1751 odisks
, ochunk
, array
.level
, olayout
, odata
,
1752 d
- odisks
, fdlist
+odisks
, offsets
+odisks
);
1754 done
= child_same_size(fd
, sra
, stripes
,
1757 odisks
, ochunk
, array
.level
, olayout
, odata
,
1758 d
- odisks
, fdlist
+odisks
, offsets
+odisks
);
1759 if (backup_file
&& done
)
1760 unlink(backup_file
);
1761 if (level
!= UnSet
&& level
!= array
.level
) {
1762 /* We need to wait for the reshape to finish
1763 * (which will have happened unless odata < ndata)
1764 * and then set the level
1767 c
= map_num(pers
, level
);
1769 exit(0);/* not possible */
1773 err
= sysfs_set_str(sra
, NULL
, "level", c
);
1775 fprintf(stderr
, Name
": %s: could not set level to %s\n",
1780 fprintf(stderr
, Name
": Cannot run child to monitor reshape: %s\n",
1785 /* The child will take care of unfreezing the array */
1794 if (rv
&& orig_level
!= UnSet
&& sra
) {
1795 c
= map_num(pers
, orig_level
);
1796 if (c
&& sysfs_set_str(sra
, NULL
, "level", c
) == 0)
1797 fprintf(stderr
, Name
": aborting level change\n");
1799 unfreeze(st
, frozen
);
1804 * We run a child process in the background which performs the following
1806 * - wait for resync to reach a certain point
1807 * - suspend io to the following section
1808 * - backup that section
1809 * - allow resync to proceed further
1811 * - discard the backup.
1813 * When are combined in slightly different ways in the three cases.
1815 * - suspend/backup/allow/wait/resume/discard
1817 * - allow/wait/suspend/backup/allow/wait/resume/discard
1819 * - wait/resume/discard/suspend/backup/allow
1821 * suspend/backup/allow always come together
1822 * wait/resume/discard do too.
1823 * For the same-size case we have two backups to improve flow.
1827 /* FIXME return status is never checked */
1828 static int grow_backup(struct mdinfo
*sra
,
1829 unsigned long long offset
, /* per device */
1830 unsigned long stripes
, /* per device */
1831 int *sources
, unsigned long long *offsets
,
1832 int disks
, int chunk
, int level
, int layout
,
1833 int dests
, int *destfd
, unsigned long long *destoffsets
,
1834 int part
, int *degraded
,
1837 /* Backup 'blocks' sectors at 'offset' on each device of the array,
1838 * to storage 'destfd' (offset 'destoffsets'), after first
1839 * suspending IO. Then allow resync to continue
1840 * over the suspended section.
1841 * Use part 'part' of the backup-super-block.
1846 unsigned long long ll
;
1848 //printf("offset %llu\n", offset);
1853 sysfs_set_num(sra
, NULL
, "suspend_hi", (offset
+ stripes
* (chunk
/512)) * odata
);
1854 /* Check that array hasn't become degraded, else we might backup the wrong data */
1855 sysfs_get_ll(sra
, NULL
, "degraded", &ll
);
1856 new_degraded
= (int)ll
;
1857 if (new_degraded
!= *degraded
) {
1858 /* check each device to ensure it is still working */
1860 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
1861 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
1863 if (sd
->disk
.state
& (1<<MD_DISK_SYNC
)) {
1865 if (sysfs_get_str(sra
, sd
, "state", sbuf
, 20) < 0 ||
1866 strstr(sbuf
, "faulty") ||
1867 strstr(sbuf
, "in_sync") == NULL
) {
1868 /* this device is dead */
1869 sd
->disk
.state
= (1<<MD_DISK_FAULTY
);
1870 if (sd
->disk
.raid_disk
>= 0 &&
1871 sources
[sd
->disk
.raid_disk
] >= 0) {
1872 close(sources
[sd
->disk
.raid_disk
]);
1873 sources
[sd
->disk
.raid_disk
] = -1;
1878 *degraded
= new_degraded
;
1881 bsb
.arraystart2
= __cpu_to_le64(offset
* odata
);
1882 bsb
.length2
= __cpu_to_le64(stripes
* (chunk
/512) * odata
);
1884 bsb
.arraystart
= __cpu_to_le64(offset
* odata
);
1885 bsb
.length
= __cpu_to_le64(stripes
* (chunk
/512) * odata
);
1888 bsb
.magic
[15] = '2';
1889 for (i
= 0; i
< dests
; i
++)
1891 lseek64(destfd
[i
], destoffsets
[i
] + __le64_to_cpu(bsb
.devstart2
)*512, 0);
1893 lseek64(destfd
[i
], destoffsets
[i
], 0);
1895 rv
= save_stripes(sources
, offsets
,
1896 disks
, chunk
, level
, layout
,
1898 offset
*512*odata
, stripes
* chunk
* odata
,
1903 bsb
.mtime
= __cpu_to_le64(time(0));
1904 for (i
= 0; i
< dests
; i
++) {
1905 bsb
.devstart
= __cpu_to_le64(destoffsets
[i
]/512);
1907 bsb
.sb_csum
= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
));
1908 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0)
1909 bsb
.sb_csum2
= bsb_csum((char*)&bsb
,
1910 ((char*)&bsb
.sb_csum2
)-((char*)&bsb
));
1913 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
] - 4096, 0)
1914 != destoffsets
[i
] - 4096)
1916 if (write(destfd
[i
], &bsb
, 512) != 512)
1918 if (destoffsets
[i
] > 4096) {
1919 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
]+stripes
*chunk
*odata
, 0) !=
1920 destoffsets
[i
]+stripes
*chunk
*odata
)
1922 if (write(destfd
[i
], &bsb
, 512) != 512)
1932 /* in 2.6.30, the value reported by sync_completed can be
1933 * less that it should be by one stripe.
1934 * This only happens when reshape hits sync_max and pauses.
1935 * So allow wait_backup to either extent sync_max further
1936 * than strictly necessary, or return before the
1937 * sync has got quite as far as we would really like.
1938 * This is what 'blocks2' is for.
1939 * The various caller give appropriate values so that
1942 /* FIXME return value is often ignored */
1943 static int wait_backup(struct mdinfo
*sra
,
1944 unsigned long long offset
, /* per device */
1945 unsigned long long blocks
, /* per device */
1946 unsigned long long blocks2
, /* per device - hack */
1947 int dests
, int *destfd
, unsigned long long *destoffsets
,
1950 /* Wait for resync to pass the section that was backed up
1951 * then erase the backup and allow IO
1953 int fd
= sysfs_get_fd(sra
, NULL
, "sync_completed");
1954 unsigned long long completed
;
1960 sysfs_set_num(sra
, NULL
, "sync_max", offset
+ blocks
+ blocks2
);
1962 sysfs_set_str(sra
, NULL
, "sync_action", "reshape");
1968 select(fd
+1, NULL
, NULL
, &rfds
, NULL
);
1969 if (sysfs_fd_get_ll(fd
, &completed
) < 0) {
1973 if (sysfs_get_str(sra
, NULL
, "sync_action",
1975 strncmp(action
, "reshape", 7) != 0)
1977 } while (completed
< offset
+ blocks
);
1981 bsb
.arraystart2
= __cpu_to_le64(0);
1982 bsb
.length2
= __cpu_to_le64(0);
1984 bsb
.arraystart
= __cpu_to_le64(0);
1985 bsb
.length
= __cpu_to_le64(0);
1987 bsb
.mtime
= __cpu_to_le64(time(0));
1989 for (i
= 0; i
< dests
; i
++) {
1990 bsb
.devstart
= __cpu_to_le64(destoffsets
[i
]/512);
1991 bsb
.sb_csum
= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
));
1992 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0)
1993 bsb
.sb_csum2
= bsb_csum((char*)&bsb
,
1994 ((char*)&bsb
.sb_csum2
)-((char*)&bsb
));
1995 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
]-4096, 0) !=
1996 destoffsets
[i
]-4096)
1999 write(destfd
[i
], &bsb
, 512) != 512)
2006 static void fail(char *msg
)
2009 rv
= (write(2, msg
, strlen(msg
)) != (int)strlen(msg
));
2010 rv
|= (write(2, "\n", 1) != 1);
2014 static char *abuf
, *bbuf
;
2015 static unsigned long long abuflen
;
2016 static void validate(int afd
, int bfd
, unsigned long long offset
)
2018 /* check that the data in the backup against the array.
2019 * This is only used for regression testing and should not
2020 * be used while the array is active
2024 lseek64(bfd
, offset
- 4096, 0);
2025 if (read(bfd
, &bsb2
, 512) != 512)
2026 fail("cannot read bsb");
2027 if (bsb2
.sb_csum
!= bsb_csum((char*)&bsb2
,
2028 ((char*)&bsb2
.sb_csum
)-((char*)&bsb2
)))
2029 fail("first csum bad");
2030 if (memcmp(bsb2
.magic
, "md_backup_data", 14) != 0)
2031 fail("magic is bad");
2032 if (memcmp(bsb2
.magic
, "md_backup_data-2", 16) == 0 &&
2033 bsb2
.sb_csum2
!= bsb_csum((char*)&bsb2
,
2034 ((char*)&bsb2
.sb_csum2
)-((char*)&bsb2
)))
2035 fail("second csum bad");
2037 if (__le64_to_cpu(bsb2
.devstart
)*512 != offset
)
2038 fail("devstart is wrong");
2041 unsigned long long len
= __le64_to_cpu(bsb2
.length
)*512;
2043 if (abuflen
< len
) {
2047 if (posix_memalign((void**)&abuf
, 4096, abuflen
) ||
2048 posix_memalign((void**)&bbuf
, 4096, abuflen
)) {
2050 /* just stop validating on mem-alloc failure */
2055 lseek64(bfd
, offset
, 0);
2056 if ((unsigned long long)read(bfd
, bbuf
, len
) != len
) {
2057 //printf("len %llu\n", len);
2058 fail("read first backup failed");
2060 lseek64(afd
, __le64_to_cpu(bsb2
.arraystart
)*512, 0);
2061 if ((unsigned long long)read(afd
, abuf
, len
) != len
)
2062 fail("read first from array failed");
2063 if (memcmp(bbuf
, abuf
, len
) != 0) {
2066 printf("offset=%llu len=%llu\n",
2067 (unsigned long long)__le64_to_cpu(bsb2
.arraystart
)*512, len
);
2068 for (i
=0; i
<len
; i
++)
2069 if (bbuf
[i
] != abuf
[i
]) {
2070 printf("first diff byte %d\n", i
);
2074 fail("data1 compare failed");
2078 unsigned long long len
= __le64_to_cpu(bsb2
.length2
)*512;
2080 if (abuflen
< len
) {
2084 abuf
= malloc(abuflen
);
2085 bbuf
= malloc(abuflen
);
2088 lseek64(bfd
, offset
+__le64_to_cpu(bsb2
.devstart2
)*512, 0);
2089 if ((unsigned long long)read(bfd
, bbuf
, len
) != len
)
2090 fail("read second backup failed");
2091 lseek64(afd
, __le64_to_cpu(bsb2
.arraystart2
)*512, 0);
2092 if ((unsigned long long)read(afd
, abuf
, len
) != len
)
2093 fail("read second from array failed");
2094 if (memcmp(bbuf
, abuf
, len
) != 0)
2095 fail("data2 compare failed");
2099 static int child_grow(int afd
, struct mdinfo
*sra
, unsigned long stripes
,
2100 int *fds
, unsigned long long *offsets
,
2101 int disks
, int chunk
, int level
, int layout
, int data
,
2102 int dests
, int *destfd
, unsigned long long *destoffsets
)
2107 if (posix_memalign((void**)&buf
, 4096, disks
* chunk
))
2108 /* Don't start the 'reshape' */
2110 sysfs_set_num(sra
, NULL
, "suspend_hi", 0);
2111 sysfs_set_num(sra
, NULL
, "suspend_lo", 0);
2112 grow_backup(sra
, 0, stripes
,
2113 fds
, offsets
, disks
, chunk
, level
, layout
,
2114 dests
, destfd
, destoffsets
,
2116 validate(afd
, destfd
[0], destoffsets
[0]);
2117 wait_backup(sra
, 0, stripes
* (chunk
/ 512), stripes
* (chunk
/ 512),
2118 dests
, destfd
, destoffsets
,
2120 sysfs_set_num(sra
, NULL
, "suspend_lo", (stripes
* (chunk
/512)) * data
);
2122 /* FIXME this should probably be numeric */
2123 sysfs_set_str(sra
, NULL
, "sync_max", "max");
2127 static int child_shrink(int afd
, struct mdinfo
*sra
, unsigned long stripes
,
2128 int *fds
, unsigned long long *offsets
,
2129 int disks
, int chunk
, int level
, int layout
, int data
,
2130 int dests
, int *destfd
, unsigned long long *destoffsets
)
2133 unsigned long long start
;
2137 if (posix_memalign((void**)&buf
, 4096, disks
* chunk
))
2139 start
= sra
->component_size
- stripes
* (chunk
/512);
2140 sysfs_set_num(sra
, NULL
, "sync_max", start
);
2141 sysfs_set_str(sra
, NULL
, "sync_action", "reshape");
2142 sysfs_set_num(sra
, NULL
, "suspend_lo", 0);
2143 sysfs_set_num(sra
, NULL
, "suspend_hi", 0);
2144 rv
= wait_backup(sra
, 0, start
- stripes
* (chunk
/512), stripes
* (chunk
/512),
2145 dests
, destfd
, destoffsets
, 0);
2148 grow_backup(sra
, 0, stripes
,
2150 disks
, chunk
, level
, layout
,
2151 dests
, destfd
, destoffsets
,
2153 validate(afd
, destfd
[0], destoffsets
[0]);
2154 wait_backup(sra
, start
, stripes
*(chunk
/512), 0,
2155 dests
, destfd
, destoffsets
, 0);
2156 sysfs_set_num(sra
, NULL
, "suspend_lo", (stripes
* (chunk
/512)) * data
);
2158 /* FIXME this should probably be numeric */
2159 sysfs_set_str(sra
, NULL
, "sync_max", "max");
2163 static int child_same_size(int afd
, struct mdinfo
*sra
, unsigned long stripes
,
2164 int *fds
, unsigned long long *offsets
,
2165 unsigned long long start
,
2166 int disks
, int chunk
, int level
, int layout
, int data
,
2167 int dests
, int *destfd
, unsigned long long *destoffsets
)
2169 unsigned long long size
;
2170 unsigned long tailstripes
= stripes
;
2173 unsigned long long speed
;
2177 if (posix_memalign((void**)&buf
, 4096, disks
* chunk
))
2180 sysfs_set_num(sra
, NULL
, "suspend_lo", 0);
2181 sysfs_set_num(sra
, NULL
, "suspend_hi", 0);
2183 sysfs_get_ll(sra
, NULL
, "sync_speed_min", &speed
);
2184 sysfs_set_num(sra
, NULL
, "sync_speed_min", 200000);
2186 grow_backup(sra
, start
, stripes
,
2188 disks
, chunk
, level
, layout
,
2189 dests
, destfd
, destoffsets
,
2191 grow_backup(sra
, (start
+ stripes
) * (chunk
/512), stripes
,
2193 disks
, chunk
, level
, layout
,
2194 dests
, destfd
, destoffsets
,
2196 validate(afd
, destfd
[0], destoffsets
[0]);
2198 start
+= stripes
* 2; /* where to read next */
2199 size
= sra
->component_size
/ (chunk
/512);
2200 while (start
< size
) {
2201 if (wait_backup(sra
, (start
-stripes
*2)*(chunk
/512),
2202 stripes
*(chunk
/512), 0,
2203 dests
, destfd
, destoffsets
,
2206 sysfs_set_num(sra
, NULL
, "suspend_lo", start
*(chunk
/512) * data
);
2207 if (start
+ stripes
> size
)
2208 tailstripes
= (size
- start
);
2210 grow_backup(sra
, start
*(chunk
/512), tailstripes
,
2212 disks
, chunk
, level
, layout
,
2213 dests
, destfd
, destoffsets
,
2214 part
, °raded
, buf
);
2217 validate(afd
, destfd
[0], destoffsets
[0]);
2219 if (wait_backup(sra
, (start
-stripes
*2) * (chunk
/512), stripes
* (chunk
/512), 0,
2220 dests
, destfd
, destoffsets
,
2223 sysfs_set_num(sra
, NULL
, "suspend_lo", ((start
-stripes
)*(chunk
/512)) * data
);
2224 wait_backup(sra
, (start
-stripes
) * (chunk
/512), tailstripes
* (chunk
/512), 0,
2225 dests
, destfd
, destoffsets
,
2227 sysfs_set_num(sra
, NULL
, "suspend_lo", (size
*(chunk
/512)) * data
);
2228 sysfs_set_num(sra
, NULL
, "sync_speed_min", speed
);
2234 * If any spare contains md_back_data-1 which is recent wrt mtime,
2235 * write that data into the array and update the super blocks with
2236 * the new reshape_progress
2238 int Grow_restart(struct supertype
*st
, struct mdinfo
*info
, int *fdlist
, int cnt
,
2239 char *backup_file
, int verbose
)
2243 unsigned long long *offsets
;
2244 unsigned long long nstripe
, ostripe
;
2247 if (info
->new_level
!= info
->array
.level
)
2248 return 1; /* Cannot handle level changes (they are instantaneous) */
2250 odata
= info
->array
.raid_disks
- info
->delta_disks
- 1;
2251 if (info
->array
.level
== 6) odata
--; /* number of data disks */
2252 ndata
= info
->array
.raid_disks
- 1;
2253 if (info
->new_level
== 6) ndata
--;
2255 old_disks
= info
->array
.raid_disks
- info
->delta_disks
;
2257 if (info
->delta_disks
<= 0)
2258 /* Didn't grow, so the backup file must have
2262 for (i
=old_disks
-(backup_file
?1:0); i
<cnt
; i
++) {
2263 struct mdinfo dinfo
;
2266 char *devname
, namebuf
[20];
2268 /* This was a spare and may have some saved data on it.
2269 * Load the superblock, find and load the
2270 * backup_super_block.
2271 * If either fail, go on to next device.
2272 * If the backup contains no new info, just return
2273 * else restore data and update all superblocks
2275 if (i
== old_disks
-1) {
2276 fd
= open(backup_file
, O_RDONLY
);
2278 fprintf(stderr
, Name
": backup file %s inaccessible: %s\n",
2279 backup_file
, strerror(errno
));
2282 devname
= backup_file
;
2287 if (st
->ss
->load_super(st
, fd
, NULL
))
2290 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
2291 st
->ss
->free_super(st
);
2294 (dinfo
.data_offset
+ dinfo
.component_size
- 8) <<9,
2296 fprintf(stderr
, Name
": Cannot seek on device %d\n", i
);
2297 continue; /* Cannot seek */
2299 sprintf(namebuf
, "device-%d", i
);
2302 if (read(fd
, &bsb
, sizeof(bsb
)) != sizeof(bsb
)) {
2304 fprintf(stderr
, Name
": Cannot read from %s\n", devname
);
2305 continue; /* Cannot read */
2307 if (memcmp(bsb
.magic
, "md_backup_data-1", 16) != 0 &&
2308 memcmp(bsb
.magic
, "md_backup_data-2", 16) != 0) {
2310 fprintf(stderr
, Name
": No backup metadata on %s\n", devname
);
2313 if (bsb
.sb_csum
!= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
))) {
2315 fprintf(stderr
, Name
": Bad backup-metadata checksum on %s\n", devname
);
2316 continue; /* bad checksum */
2318 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0 &&
2319 bsb
.sb_csum2
!= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum2
)-((char*)&bsb
))) {
2321 fprintf(stderr
, Name
": Bad backup-metadata checksum2 on %s\n", devname
);
2322 continue; /* Bad second checksum */
2324 if (memcmp(bsb
.set_uuid
,info
->uuid
, 16) != 0) {
2326 fprintf(stderr
, Name
": Wrong uuid on backup-metadata on %s\n", devname
);
2327 continue; /* Wrong uuid */
2330 /* array utime and backup-mtime should be updated at much the same time, but it seems that
2331 * sometimes they aren't... So allow considerable flexability in matching, and allow
2332 * this test to be overridden by an environment variable.
2334 if (info
->array
.utime
> (int)__le64_to_cpu(bsb
.mtime
) + 2*60*60 ||
2335 info
->array
.utime
< (int)__le64_to_cpu(bsb
.mtime
) - 10*60) {
2336 if (check_env("MDADM_GROW_ALLOW_OLD")) {
2337 fprintf(stderr
, Name
": accepting backup with timestamp %lu "
2338 "for array with timestamp %lu\n",
2339 (unsigned long)__le64_to_cpu(bsb
.mtime
),
2340 (unsigned long)info
->array
.utime
);
2343 fprintf(stderr
, Name
": too-old timestamp on "
2344 "backup-metadata on %s\n", devname
);
2345 continue; /* time stamp is too bad */
2349 if (bsb
.magic
[15] == '1') {
2350 if (info
->delta_disks
>= 0) {
2351 /* reshape_progress is increasing */
2352 if (__le64_to_cpu(bsb
.arraystart
) + __le64_to_cpu(bsb
.length
) <
2353 info
->reshape_progress
) {
2356 fprintf(stderr
, Name
": backup-metadata found on %s but is not needed\n", devname
);
2357 continue; /* No new data here */
2360 /* reshape_progress is decreasing */
2361 if (__le64_to_cpu(bsb
.arraystart
) >=
2362 info
->reshape_progress
)
2363 goto nonew
; /* No new data here */
2366 if (info
->delta_disks
>= 0) {
2367 /* reshape_progress is increasing */
2368 if (__le64_to_cpu(bsb
.arraystart
) + __le64_to_cpu(bsb
.length
) <
2369 info
->reshape_progress
&&
2370 __le64_to_cpu(bsb
.arraystart2
) + __le64_to_cpu(bsb
.length2
) <
2371 info
->reshape_progress
)
2372 goto nonew
; /* No new data here */
2374 /* reshape_progress is decreasing */
2375 if (__le64_to_cpu(bsb
.arraystart
) >=
2376 info
->reshape_progress
&&
2377 __le64_to_cpu(bsb
.arraystart2
) >=
2378 info
->reshape_progress
)
2379 goto nonew
; /* No new data here */
2382 if (lseek64(fd
, __le64_to_cpu(bsb
.devstart
)*512, 0)< 0) {
2385 fprintf(stderr
, Name
": Failed to verify secondary backup-metadata block on %s\n",
2387 continue; /* Cannot seek */
2389 /* There should be a duplicate backup superblock 4k before here */
2390 if (lseek64(fd
, -4096, 1) < 0 ||
2391 read(fd
, &bsb2
, sizeof(bsb2
)) != sizeof(bsb2
))
2392 goto second_fail
; /* Cannot find leading superblock */
2393 if (bsb
.magic
[15] == '1')
2394 bsbsize
= offsetof(struct mdp_backup_super
, pad1
);
2396 bsbsize
= offsetof(struct mdp_backup_super
, pad
);
2397 if (memcmp(&bsb2
, &bsb
, bsbsize
) != 0)
2398 goto second_fail
; /* Cannot find leading superblock */
2400 /* Now need the data offsets for all devices. */
2401 offsets
= malloc(sizeof(*offsets
)*info
->array
.raid_disks
);
2402 for(j
=0; j
<info
->array
.raid_disks
; j
++) {
2405 if (st
->ss
->load_super(st
, fdlist
[j
], NULL
))
2406 /* FIXME should be this be an error */
2408 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
2409 st
->ss
->free_super(st
);
2410 offsets
[j
] = dinfo
.data_offset
* 512;
2412 printf(Name
": restoring critical section\n");
2414 if (restore_stripes(fdlist
, offsets
,
2415 info
->array
.raid_disks
,
2419 fd
, __le64_to_cpu(bsb
.devstart
)*512,
2420 __le64_to_cpu(bsb
.arraystart
)*512,
2421 __le64_to_cpu(bsb
.length
)*512)) {
2422 /* didn't succeed, so giveup */
2424 fprintf(stderr
, Name
": Error restoring backup from %s\n",
2429 if (bsb
.magic
[15] == '2' &&
2430 restore_stripes(fdlist
, offsets
,
2431 info
->array
.raid_disks
,
2435 fd
, __le64_to_cpu(bsb
.devstart
)*512 +
2436 __le64_to_cpu(bsb
.devstart2
)*512,
2437 __le64_to_cpu(bsb
.arraystart2
)*512,
2438 __le64_to_cpu(bsb
.length2
)*512)) {
2439 /* didn't succeed, so giveup */
2441 fprintf(stderr
, Name
": Error restoring second backup from %s\n",
2447 /* Ok, so the data is restored. Let's update those superblocks. */
2449 if (info
->delta_disks
>= 0) {
2450 info
->reshape_progress
= __le64_to_cpu(bsb
.arraystart
) +
2451 __le64_to_cpu(bsb
.length
);
2452 if (bsb
.magic
[15] == '2') {
2453 unsigned long long p2
= __le64_to_cpu(bsb
.arraystart2
) +
2454 __le64_to_cpu(bsb
.length2
);
2455 if (p2
> info
->reshape_progress
)
2456 info
->reshape_progress
= p2
;
2459 info
->reshape_progress
= __le64_to_cpu(bsb
.arraystart
);
2460 if (bsb
.magic
[15] == '2') {
2461 unsigned long long p2
= __le64_to_cpu(bsb
.arraystart2
);
2462 if (p2
< info
->reshape_progress
)
2463 info
->reshape_progress
= p2
;
2466 for (j
=0; j
<info
->array
.raid_disks
; j
++) {
2467 if (fdlist
[j
] < 0) continue;
2468 if (st
->ss
->load_super(st
, fdlist
[j
], NULL
))
2470 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
2471 dinfo
.reshape_progress
= info
->reshape_progress
;
2472 st
->ss
->update_super(st
, &dinfo
,
2473 "_reshape_progress",
2475 st
->ss
->store_super(st
, fdlist
[j
]);
2476 st
->ss
->free_super(st
);
2480 /* Didn't find any backup data, try to see if any
2483 if (info
->delta_disks
< 0) {
2484 /* When shrinking, the critical section is at the end.
2485 * So see if we are before the critical section.
2487 unsigned long long first_block
;
2488 nstripe
= ostripe
= 0;
2490 while (ostripe
>= nstripe
) {
2491 ostripe
+= info
->array
.chunk_size
/ 512;
2492 first_block
= ostripe
* odata
;
2493 nstripe
= first_block
/ ndata
/ (info
->new_chunk
/512) *
2494 (info
->new_chunk
/512);
2497 if (info
->reshape_progress
>= first_block
)
2500 if (info
->delta_disks
> 0) {
2501 /* See if we are beyond the critical section. */
2502 unsigned long long last_block
;
2503 nstripe
= ostripe
= 0;
2505 while (nstripe
>= ostripe
) {
2506 nstripe
+= info
->new_chunk
/ 512;
2507 last_block
= nstripe
* ndata
;
2508 ostripe
= last_block
/ odata
/ (info
->array
.chunk_size
/512) *
2509 (info
->array
.chunk_size
/512);
2512 if (info
->reshape_progress
>= last_block
)
2515 /* needed to recover critical section! */
2517 fprintf(stderr
, Name
": Failed to find backup of critical section\n");
2521 int Grow_continue(int mdfd
, struct supertype
*st
, struct mdinfo
*info
,
2524 /* Array is assembled and ready to be started, but
2525 * monitoring is probably required.
2528 * - set upper bound for resync
2529 * - initialise the 'suspend' boundaries
2530 * - switch to read-write
2531 * - fork and continue monitoring
2535 unsigned long long backup_offsets
[1];
2536 int odisks
, ndisks
, ochunk
, nchunk
,odata
,ndata
;
2537 unsigned long a
,b
,blocks
,stripes
;
2540 unsigned long long *offsets
;
2542 struct mdinfo
*sra
, *sd
;
2544 unsigned long cache
;
2547 err
= sysfs_set_str(info
, NULL
, "array_state", "readonly");
2551 /* make sure reshape doesn't progress until we are ready */
2552 sysfs_set_str(info
, NULL
, "sync_max", "0");
2553 sysfs_set_str(info
, NULL
, "array_state", "active"); /* FIXME or clean */
2555 sra
= sysfs_read(-1, devname2devnum(info
->sys_name
),
2556 GET_COMPONENT
|GET_DEVS
|GET_OFFSET
|GET_STATE
|
2561 /* ndisks is not growing, so raid_disks is old and +delta is new */
2562 odisks
= info
->array
.raid_disks
;
2563 ndisks
= odisks
+ info
->delta_disks
;
2566 if (info
->array
.level
== 6) {
2570 ochunk
= info
->array
.chunk_size
;
2571 nchunk
= info
->new_chunk
;
2573 a
= (ochunk
/512) * odata
;
2574 b
= (nchunk
/512) * ndata
;
2582 /* LCM == product / GCD */
2583 blocks
= (ochunk
/512) * (nchunk
/512) * odata
* ndata
/ a
;
2586 while (blocks
* 32 < sra
->component_size
&&
2589 stripes
= blocks
/ (info
->array
.chunk_size
/512) / odata
;
2591 /* check that the internal stripe cache is
2592 * large enough, or it won't work.
2594 cache
= (nchunk
< ochunk
) ? ochunk
: nchunk
;
2595 cache
= cache
* 4 / 4096;
2596 if (cache
< blocks
/ 8 / odisks
+ 16)
2597 /* Make it big enough to hold 'blocks' */
2598 cache
= blocks
/ 8 / odisks
+ 16;
2599 if (sra
->cache_size
< cache
)
2600 sysfs_set_num(sra
, NULL
, "stripe_cache_size",
2603 memset(&bsb
, 0, 512);
2604 memcpy(bsb
.magic
, "md_backup_data-1", 16);
2605 memcpy(&bsb
.set_uuid
, info
->uuid
, 16);
2606 bsb
.mtime
= __cpu_to_le64(time(0));
2607 bsb
.devstart2
= blocks
;
2609 backup_fd
= open(backup_file
, O_RDWR
|O_CREAT
, S_IRUSR
| S_IWUSR
);
2610 backup_list
[0] = backup_fd
;
2611 backup_offsets
[0] = 8 * 512;
2612 fds
= malloc(odisks
* sizeof(fds
[0]));
2613 offsets
= malloc(odisks
* sizeof(offsets
[0]));
2614 for (d
=0; d
<odisks
; d
++)
2617 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
2618 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
2620 if (sd
->disk
.state
& (1<<MD_DISK_SYNC
)) {
2621 char *dn
= map_dev(sd
->disk
.major
,
2623 fds
[sd
->disk
.raid_disk
]
2624 = dev_open(dn
, O_RDONLY
);
2625 offsets
[sd
->disk
.raid_disk
] = sd
->data_offset
*512;
2626 if (fds
[sd
->disk
.raid_disk
] < 0) {
2627 fprintf(stderr
, Name
": %s: cannot open component %s\n",
2628 info
->sys_name
, dn
?dn
:"-unknown-");
2639 mlockall(MCL_FUTURE
);
2640 if (info
->delta_disks
< 0)
2641 done
= child_shrink(-1, info
, stripes
,
2643 info
->array
.raid_disks
,
2644 info
->array
.chunk_size
,
2645 info
->array
.level
, info
->array
.layout
,
2647 1, backup_list
, backup_offsets
);
2648 else if (info
->delta_disks
== 0) {
2649 /* The 'start' is a per-device stripe number.
2650 * reshape_progress is a per-array sector number.
2651 * So divide by ndata * chunk_size
2653 unsigned long long start
= info
->reshape_progress
/ ndata
;
2654 start
/= (info
->array
.chunk_size
/512);
2655 done
= child_same_size(-1, info
, stripes
,
2658 info
->array
.raid_disks
,
2659 info
->array
.chunk_size
,
2660 info
->array
.level
, info
->array
.layout
,
2662 1, backup_list
, backup_offsets
);
2664 if (backup_file
&& done
)
2665 unlink(backup_file
);
2666 /* FIXME should I intuit a level change */
2669 fprintf(stderr
, Name
": Cannot run child to continue monitoring reshape: %s\n",