2 * mdadm - manage Linux "md" devices aka RAID arrays.
4 * Copyright (C) 2001-2012 Neil Brown <neilb@suse.de>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * Email: <neilb@suse.de>
29 #if ! defined(__BIG_ENDIAN) && ! defined(__LITTLE_ENDIAN)
30 #error no endian defined
36 #define offsetof(t,f) ((size_t)&(((t*)0)->f))
39 int restore_backup(struct supertype
*st
,
40 struct mdinfo
*content
,
50 int disk_count
= next_spare
+ working_disks
;
52 dprintf("Called restore_backup()\n");
53 fdlist
= xmalloc(sizeof(int) * disk_count
);
55 for (i
= 0; i
< next_spare
; i
++)
57 for (dev
= content
->devs
; dev
; dev
= dev
->next
) {
63 fd
= dev_open(buf
, O_RDWR
);
65 if (dev
->disk
.raid_disk
>= 0)
66 fdlist
[dev
->disk
.raid_disk
] = fd
;
68 fdlist
[next_spare
++] = fd
;
71 if (st
->ss
->external
&& st
->ss
->recover_backup
)
72 err
= st
->ss
->recover_backup(st
, content
);
74 err
= Grow_restart(st
, content
, fdlist
, next_spare
,
75 backup_file
, verbose
> 0);
77 while (next_spare
> 0) {
79 if (fdlist
[next_spare
] >= 0)
80 close(fdlist
[next_spare
]);
84 pr_err("Failed to restore critical"
85 " section for reshape - sorry.\n");
87 pr_err("Possibly you need"
88 " to specify a --backup-file\n");
92 dprintf("restore_backup() returns status OK.\n");
96 int Grow_Add_device(char *devname
, int fd
, char *newdev
)
98 /* Add a device to an active array.
99 * Currently, just extend a linear array.
100 * This requires writing a new superblock on the
101 * new device, calling the kernel to add the device,
102 * and if that succeeds, update the superblock on
104 * This means that we need to *find* all other devices.
111 struct supertype
*st
= NULL
;
112 char *subarray
= NULL
;
114 if (ioctl(fd
, GET_ARRAY_INFO
, &info
.array
) < 0) {
115 pr_err("cannot get array info for %s\n", devname
);
119 if (info
.array
.level
!= -1) {
120 pr_err("can only add devices to linear arrays\n");
124 st
= super_by_fd(fd
, &subarray
);
126 pr_err("cannot handle arrays with superblock version %d\n",
127 info
.array
.major_version
);
132 pr_err("Cannot grow linear sub-arrays yet\n");
138 nfd
= open(newdev
, O_RDWR
|O_EXCL
|O_DIRECT
);
140 pr_err("cannot open %s\n", newdev
);
145 if ((stb
.st_mode
& S_IFMT
) != S_IFBLK
) {
146 pr_err("%s is not a block device!\n", newdev
);
151 /* now check out all the devices and make sure we can read the
153 for (d
=0 ; d
< info
.array
.raid_disks
; d
++) {
154 mdu_disk_info_t disk
;
157 st
->ss
->free_super(st
);
160 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0) {
161 pr_err("cannot get device detail for device %d\n",
167 dv
= map_dev(disk
.major
, disk
.minor
, 1);
169 pr_err("cannot find device file for device %d\n",
175 fd2
= dev_open(dv
, O_RDWR
);
177 pr_err("cannot open device file %s\n", dv
);
183 if (st
->ss
->load_super(st
, fd2
, NULL
)) {
184 pr_err("cannot find super block on %s\n", dv
);
192 /* Ok, looks good. Lets update the superblock and write it out to
196 info
.disk
.number
= d
;
197 info
.disk
.major
= major(stb
.st_rdev
);
198 info
.disk
.minor
= minor(stb
.st_rdev
);
199 info
.disk
.raid_disk
= d
;
200 info
.disk
.state
= (1 << MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
);
201 st
->ss
->update_super(st
, &info
, "linear-grow-new", newdev
,
204 if (st
->ss
->store_super(st
, nfd
)) {
205 pr_err("Cannot store new superblock on %s\n",
212 if (ioctl(fd
, ADD_NEW_DISK
, &info
.disk
) != 0) {
213 pr_err("Cannot add new disk to this array\n");
216 /* Well, that seems to have worked.
217 * Now go through and update all superblocks
220 if (ioctl(fd
, GET_ARRAY_INFO
, &info
.array
) < 0) {
221 pr_err("cannot get array info for %s\n", devname
);
226 for (d
=0 ; d
< info
.array
.raid_disks
; d
++) {
227 mdu_disk_info_t disk
;
231 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0) {
232 pr_err("cannot get device detail for device %d\n",
236 dv
= map_dev(disk
.major
, disk
.minor
, 1);
238 pr_err("cannot find device file for device %d\n",
242 fd2
= dev_open(dv
, O_RDWR
);
244 pr_err("cannot open device file %s\n", dv
);
247 if (st
->ss
->load_super(st
, fd2
, NULL
)) {
248 pr_err("cannot find super block on %s\n", dv
);
252 info
.array
.raid_disks
= nd
+1;
253 info
.array
.nr_disks
= nd
+1;
254 info
.array
.active_disks
= nd
+1;
255 info
.array
.working_disks
= nd
+1;
257 st
->ss
->update_super(st
, &info
, "linear-grow-update", dv
,
260 if (st
->ss
->store_super(st
, fd2
)) {
261 pr_err("Cannot store new superblock on %s\n", dv
);
271 int Grow_addbitmap(char *devname
, int fd
, struct context
*c
, struct shape
*s
)
274 * First check that array doesn't have a bitmap
275 * Then create the bitmap
278 * For internal bitmaps, we need to check the version,
279 * find all the active devices, and write the bitmap block
282 mdu_bitmap_file_t bmf
;
283 mdu_array_info_t array
;
284 struct supertype
*st
;
285 char *subarray
= NULL
;
286 int major
= BITMAP_MAJOR_HI
;
287 int vers
= md_get_version(fd
);
288 unsigned long long bitmapsize
, array_size
;
291 major
= BITMAP_MAJOR_HOSTENDIAN
;
292 pr_err("Warning - bitmaps created on this kernel"
293 " are not portable\n"
294 " between different architectures. Consider upgrading"
295 " the Linux kernel.\n");
298 if (ioctl(fd
, GET_BITMAP_FILE
, &bmf
) != 0) {
300 pr_err("Memory allocation failure.\n");
302 pr_err("bitmaps not supported by this kernel.\n");
305 if (bmf
.pathname
[0]) {
306 if (strcmp(s
->bitmap_file
,"none")==0) {
307 if (ioctl(fd
, SET_BITMAP_FILE
, -1)!= 0) {
308 pr_err("failed to remove bitmap %s\n",
314 pr_err("%s already has a bitmap (%s)\n",
315 devname
, bmf
.pathname
);
318 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) != 0) {
319 pr_err("cannot get array status for %s\n", devname
);
322 if (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)) {
323 if (strcmp(s
->bitmap_file
, "none")==0) {
324 array
.state
&= ~(1<<MD_SB_BITMAP_PRESENT
);
325 if (ioctl(fd
, SET_ARRAY_INFO
, &array
)!= 0) {
326 pr_err("failed to remove internal bitmap.\n");
331 pr_err("Internal bitmap already present on %s\n",
336 if (strcmp(s
->bitmap_file
, "none") == 0) {
337 pr_err("no bitmap found on %s\n", devname
);
340 if (array
.level
<= 0) {
341 pr_err("Bitmaps not meaningful with level %s\n",
342 map_num(pers
, array
.level
)?:"of this array");
345 bitmapsize
= array
.size
;
347 if (get_dev_size(fd
, NULL
, &array_size
) &&
348 array_size
> (0x7fffffffULL
<<9)) {
349 /* Array is big enough that we cannot trust array.size
350 * try other approaches
352 bitmapsize
= get_component_size(fd
);
354 if (bitmapsize
== 0) {
355 pr_err("Cannot reliably determine size of array to create bitmap - sorry.\n");
359 if (array
.level
== 10) {
360 int ncopies
= (array
.layout
&255)*((array
.layout
>>8)&255);
361 bitmapsize
= bitmapsize
* array
.raid_disks
/ ncopies
;
364 st
= super_by_fd(fd
, &subarray
);
366 pr_err("Cannot understand version %d.%d\n",
367 array
.major_version
, array
.minor_version
);
371 pr_err("Cannot add bitmaps to sub-arrays yet\n");
376 if (strcmp(s
->bitmap_file
, "internal") == 0) {
379 int offset_setable
= 0;
381 if (st
->ss
->add_internal_bitmap
== NULL
) {
382 pr_err("Internal bitmaps not supported "
383 "with %s metadata\n", st
->ss
->name
);
386 mdi
= sysfs_read(fd
, NULL
, GET_BITMAP_LOCATION
);
389 for (d
=0; d
< st
->max_devs
; d
++) {
390 mdu_disk_info_t disk
;
393 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
395 if (disk
.major
== 0 &&
398 if ((disk
.state
& (1<<MD_DISK_SYNC
))==0)
400 dv
= map_dev(disk
.major
, disk
.minor
, 1);
402 int fd2
= dev_open(dv
, O_RDWR
);
405 if (st
->ss
->load_super(st
, fd2
, NULL
)==0) {
406 if (st
->ss
->add_internal_bitmap(
408 &s
->bitmap_chunk
, c
->delay
, s
->write_behind
,
409 bitmapsize
, offset_setable
,
412 st
->ss
->write_bitmap(st
, fd2
);
414 pr_err("failed to create internal bitmap"
415 " - chunksize problem.\n");
423 if (offset_setable
) {
424 st
->ss
->getinfo_super(st
, mdi
, NULL
);
425 sysfs_init(mdi
, fd
, NULL
);
426 rv
= sysfs_set_num_signed(mdi
, NULL
, "bitmap/location",
429 array
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
430 rv
= ioctl(fd
, SET_ARRAY_INFO
, &array
);
434 pr_err("Cannot add bitmap while array is"
435 " resyncing or reshaping etc.\n");
436 pr_err("failed to set internal bitmap.\n");
443 int max_devs
= st
->max_devs
;
445 /* try to load a superblock */
446 for (d
= 0; d
< max_devs
; d
++) {
447 mdu_disk_info_t disk
;
451 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
453 if ((disk
.major
==0 && disk
.minor
==0) ||
454 (disk
.state
& (1<<MD_DISK_REMOVED
)))
456 dv
= map_dev(disk
.major
, disk
.minor
, 1);
459 fd2
= dev_open(dv
, O_RDONLY
);
461 if (st
->ss
->load_super(st
, fd2
, NULL
) == 0) {
463 st
->ss
->uuid_from_super(st
, uuid
);
470 pr_err("cannot find UUID for array!\n");
473 if (CreateBitmap(s
->bitmap_file
, c
->force
, (char*)uuid
, s
->bitmap_chunk
,
474 c
->delay
, s
->write_behind
, bitmapsize
, major
)) {
477 bitmap_fd
= open(s
->bitmap_file
, O_RDWR
);
479 pr_err("weird: %s cannot be opened\n",
483 if (ioctl(fd
, SET_BITMAP_FILE
, bitmap_fd
) < 0) {
486 pr_err("Cannot add bitmap while array is"
487 " resyncing or reshaping etc.\n");
488 pr_err("Cannot set bitmap file for %s: %s\n",
489 devname
, strerror(err
));
498 * When reshaping an array we might need to backup some data.
499 * This is written to all spares with a 'super_block' describing it.
500 * The superblock goes 4K from the end of the used space on the
502 * It if written after the backup is complete.
503 * It has the following structure.
506 static struct mdp_backup_super
{
507 char magic
[16]; /* md_backup_data-1 or -2 */
510 /* start/sizes in 512byte sectors */
511 __u64 devstart
; /* address on backup device/file of data */
514 __u32 sb_csum
; /* csum of preceeding bytes. */
516 __u64 devstart2
; /* offset in to data of second section */
519 __u32 sb_csum2
; /* csum of preceeding bytes. */
521 } __attribute__((aligned(512))) bsb
, bsb2
;
523 static __u32
bsb_csum(char *buf
, int len
)
527 for (i
= 0; i
< len
; i
++)
528 csum
= (csum
<<3) + buf
[0];
529 return __cpu_to_le32(csum
);
532 static int check_idle(struct supertype
*st
)
534 /* Check that all member arrays for this container, or the
535 * container of this array, are idle
537 char *container
= (st
->container_devnm
[0]
538 ? st
->container_devnm
: st
->devnm
);
539 struct mdstat_ent
*ent
, *e
;
542 ent
= mdstat_read(0, 0);
543 for (e
= ent
; e
; e
= e
->next
) {
544 if (!is_container_member(e
, container
))
546 if (e
->percent
>= 0) {
555 static int freeze_container(struct supertype
*st
)
557 char *container
= (st
->container_devnm
[0]
558 ? st
->container_devnm
: st
->devnm
);
563 if (block_monitor(container
, 1)) {
564 pr_err("failed to freeze container\n");
571 static void unfreeze_container(struct supertype
*st
)
573 char *container
= (st
->container_devnm
[0]
574 ? st
->container_devnm
: st
->devnm
);
576 unblock_monitor(container
, 1);
579 static int freeze(struct supertype
*st
)
581 /* Try to freeze resync/rebuild on this array/container.
582 * Return -1 if the array is busy,
583 * return -2 container cannot be frozen,
584 * return 0 if this kernel doesn't support 'frozen'
585 * return 1 if it worked.
587 if (st
->ss
->external
)
588 return freeze_container(st
);
590 struct mdinfo
*sra
= sysfs_read(-1, st
->devnm
, GET_VERSION
);
596 /* Need to clear any 'read-auto' status */
597 if (sysfs_get_str(sra
, NULL
, "array_state", buf
, 20) > 0 &&
598 strncmp(buf
, "read-auto", 9) == 0)
599 sysfs_set_str(sra
, NULL
, "array_state", "clean");
601 err
= sysfs_freeze_array(sra
);
607 static void unfreeze(struct supertype
*st
)
609 if (st
->ss
->external
)
610 return unfreeze_container(st
);
612 struct mdinfo
*sra
= sysfs_read(-1, st
->devnm
, GET_VERSION
);
615 sysfs_set_str(sra
, NULL
, "sync_action", "idle");
620 static void wait_reshape(struct mdinfo
*sra
)
622 int fd
= sysfs_get_fd(sra
, NULL
, "sync_action");
628 while (sysfs_fd_get_str(fd
, action
, 20) > 0 &&
629 strncmp(action
, "reshape", 7) == 0) {
633 select(fd
+1, NULL
, NULL
, &rfds
, NULL
);
638 static int reshape_super(struct supertype
*st
, unsigned long long size
,
639 int level
, int layout
, int chunksize
, int raid_disks
,
640 int delta_disks
, char *backup_file
, char *dev
,
641 int direction
, int verbose
)
643 /* nothing extra to check in the native case */
644 if (!st
->ss
->external
)
646 if (!st
->ss
->reshape_super
||
647 !st
->ss
->manage_reshape
) {
648 pr_err("%s metadata does not support reshape\n",
653 return st
->ss
->reshape_super(st
, size
, level
, layout
, chunksize
,
654 raid_disks
, delta_disks
, backup_file
, dev
,
658 static void sync_metadata(struct supertype
*st
)
660 if (st
->ss
->external
) {
661 if (st
->update_tail
) {
662 flush_metadata_updates(st
);
663 st
->update_tail
= &st
->updates
;
665 st
->ss
->sync_metadata(st
);
669 static int subarray_set_num(char *container
, struct mdinfo
*sra
, char *name
, int n
)
671 /* when dealing with external metadata subarrays we need to be
672 * prepared to handle EAGAIN. The kernel may need to wait for
673 * mdmon to mark the array active so the kernel can handle
674 * allocations/writeback when preparing the reshape action
675 * (md_allow_write()). We temporarily disable safe_mode_delay
676 * to close a race with the array_state going clean before the
677 * next write to raid_disks / stripe_cache_size
682 /* only 'raid_disks' and 'stripe_cache_size' trigger md_allow_write */
684 (strcmp(name
, "raid_disks") != 0 &&
685 strcmp(name
, "stripe_cache_size") != 0))
686 return sysfs_set_num(sra
, NULL
, name
, n
);
688 rc
= sysfs_get_str(sra
, NULL
, "safe_mode_delay", safe
, sizeof(safe
));
691 sysfs_set_num(sra
, NULL
, "safe_mode_delay", 0);
692 rc
= sysfs_set_num(sra
, NULL
, name
, n
);
693 if (rc
< 0 && errno
== EAGAIN
) {
694 ping_monitor(container
);
695 /* if we get EAGAIN here then the monitor is not active
698 rc
= sysfs_set_num(sra
, NULL
, name
, n
);
700 sysfs_set_str(sra
, NULL
, "safe_mode_delay", safe
);
704 int start_reshape(struct mdinfo
*sra
, int already_running
,
705 int before_data_disks
, int data_disks
)
708 unsigned long long sync_max_to_set
;
710 sysfs_set_num(sra
, NULL
, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL
);
711 err
= sysfs_set_num(sra
, NULL
, "suspend_hi", sra
->reshape_progress
);
712 err
= err
?: sysfs_set_num(sra
, NULL
, "suspend_lo",
713 sra
->reshape_progress
);
714 if (before_data_disks
<= data_disks
)
715 sync_max_to_set
= sra
->reshape_progress
/ data_disks
;
717 sync_max_to_set
= (sra
->component_size
* data_disks
718 - sra
->reshape_progress
) / data_disks
;
719 if (!already_running
)
720 sysfs_set_num(sra
, NULL
, "sync_min", sync_max_to_set
);
721 err
= err
?: sysfs_set_num(sra
, NULL
, "sync_max", sync_max_to_set
);
722 if (!already_running
)
723 err
= err
?: sysfs_set_str(sra
, NULL
, "sync_action", "reshape");
728 void abort_reshape(struct mdinfo
*sra
)
730 sysfs_set_str(sra
, NULL
, "sync_action", "idle");
731 sysfs_set_num(sra
, NULL
, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL
);
732 sysfs_set_num(sra
, NULL
, "suspend_hi", 0);
733 sysfs_set_num(sra
, NULL
, "suspend_lo", 0);
734 sysfs_set_num(sra
, NULL
, "sync_min", 0);
735 sysfs_set_str(sra
, NULL
, "sync_max", "max");
738 int remove_disks_for_takeover(struct supertype
*st
,
743 struct mdinfo
*remaining
;
746 if (sra
->array
.level
== 10)
747 nr_of_copies
= layout
& 0xff;
748 else if (sra
->array
.level
== 1)
749 nr_of_copies
= sra
->array
.raid_disks
;
753 remaining
= sra
->devs
;
755 /* for each 'copy', select one device and remove from the list. */
756 for (slot
= 0; slot
< sra
->array
.raid_disks
; slot
+= nr_of_copies
) {
757 struct mdinfo
**diskp
;
760 /* Find a working device to keep */
761 for (diskp
= &remaining
; *diskp
; diskp
= &(*diskp
)->next
) {
762 struct mdinfo
*disk
= *diskp
;
764 if (disk
->disk
.raid_disk
< slot
)
766 if (disk
->disk
.raid_disk
>= slot
+ nr_of_copies
)
768 if (disk
->disk
.state
& (1<<MD_DISK_REMOVED
))
770 if (disk
->disk
.state
& (1<<MD_DISK_FAULTY
))
772 if (!(disk
->disk
.state
& (1<<MD_DISK_SYNC
)))
775 /* We have found a good disk to use! */
777 disk
->next
= sra
->devs
;
786 if (slot
< sra
->array
.raid_disks
) {
787 /* didn't find all slots */
793 sra
->devs
= remaining
;
797 /* Remove all 'remaining' devices from the array */
799 struct mdinfo
*sd
= remaining
;
800 remaining
= sd
->next
;
802 sysfs_set_str(sra
, sd
, "state", "faulty");
803 sysfs_set_str(sra
, sd
, "slot", "none");
804 /* for external metadata disks should be removed in mdmon */
805 if (!st
->ss
->external
)
806 sysfs_set_str(sra
, sd
, "state", "remove");
807 sd
->disk
.state
|= (1<<MD_DISK_REMOVED
);
808 sd
->disk
.state
&= ~(1<<MD_DISK_SYNC
);
809 sd
->next
= sra
->devs
;
815 void reshape_free_fdlist(int *fdlist
,
816 unsigned long long *offsets
,
821 for (i
= 0; i
< size
; i
++)
829 int reshape_prepare_fdlist(char *devname
,
833 unsigned long blocks
,
836 unsigned long long *offsets
)
841 for (d
= 0; d
<= nrdisks
; d
++)
844 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
845 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
847 if (sd
->disk
.state
& (1<<MD_DISK_SYNC
)) {
848 char *dn
= map_dev(sd
->disk
.major
,
850 fdlist
[sd
->disk
.raid_disk
]
851 = dev_open(dn
, O_RDONLY
);
852 offsets
[sd
->disk
.raid_disk
] = sd
->data_offset
*512;
853 if (fdlist
[sd
->disk
.raid_disk
] < 0) {
854 pr_err("%s: cannot open component %s\n",
855 devname
, dn
? dn
: "-unknown-");
859 } else if (backup_file
== NULL
) {
861 char *dn
= map_dev(sd
->disk
.major
,
863 fdlist
[d
] = dev_open(dn
, O_RDWR
);
864 offsets
[d
] = (sd
->data_offset
+ sra
->component_size
- blocks
- 8)*512;
866 pr_err("%s: cannot open component %s\n",
867 devname
, dn
? dn
: "-unknown-");
878 int reshape_open_backup_file(char *backup_file
,
883 unsigned long long *offsets
,
886 /* Return 1 on success, 0 on any form of failure */
887 /* need to check backup file is large enough */
893 *fdlist
= open(backup_file
, O_RDWR
|O_CREAT
|(restart
? O_TRUNC
: O_EXCL
),
897 pr_err("%s: cannot create backup file %s: %s\n",
898 devname
, backup_file
, strerror(errno
));
901 /* Guard against backup file being on array device.
902 * If array is partitioned or if LVM etc is in the
903 * way this will not notice, but it is better than
906 fstat(*fdlist
, &stb
);
909 if (stb
.st_rdev
== dev
) {
910 pr_err("backup file must NOT be"
911 " on the array being reshaped.\n");
917 for (i
=0; i
< blocks
+ 8 ; i
++) {
918 if (write(*fdlist
, buf
, 512) != 512) {
919 pr_err("%s: cannot create"
920 " backup file %s: %s\n",
921 devname
, backup_file
, strerror(errno
));
925 if (fsync(*fdlist
) != 0) {
926 pr_err("%s: cannot create backup file %s: %s\n",
927 devname
, backup_file
, strerror(errno
));
934 unsigned long GCD(unsigned long a
, unsigned long b
)
945 unsigned long compute_backup_blocks(int nchunk
, int ochunk
,
946 unsigned int ndata
, unsigned int odata
)
948 unsigned long a
, b
, blocks
;
949 /* So how much do we need to backup.
950 * We need an amount of data which is both a whole number of
951 * old stripes and a whole number of new stripes.
952 * So LCM for (chunksize*datadisks).
954 a
= (ochunk
/512) * odata
;
955 b
= (nchunk
/512) * ndata
;
958 /* LCM == product / GCD */
959 blocks
= (ochunk
/512) * (nchunk
/512) * odata
* ndata
/ a
;
964 char *analyse_change(struct mdinfo
*info
, struct reshape
*re
)
966 /* Based on the current array state in info->array and
967 * the changes in info->new_* etc, determine:
968 * - whether the change is possible
969 * - Intermediate level/raid_disks/layout
970 * - whether a restriping reshape is needed
971 * - number of sectors in minimum change unit. This
972 * will cover a whole number of stripes in 'before' and
975 * Return message if the change should be rejected
976 * NULL if the change can be achieved
978 * This can be called as part of starting a reshape, or
979 * when assembling an array that is undergoing reshape.
981 int near
, far
, offset
, copies
;
983 int old_chunk
, new_chunk
;
984 /* delta_parity records change in number of devices
985 * caused by level change
987 int delta_parity
= 0;
989 memset(re
, 0, sizeof(*re
));
991 /* If a new level not explicitly given, we assume no-change */
992 if (info
->new_level
== UnSet
)
993 info
->new_level
= info
->array
.level
;
996 switch (info
->new_level
) {
1002 /* chunk size is meaningful, must divide component_size
1005 if (info
->component_size
% (info
->new_chunk
/512))
1006 return "New chunk size does not"
1007 " divide component size";
1010 return "chunk size not meaningful for this level";
1013 info
->new_chunk
= info
->array
.chunk_size
;
1015 switch (info
->array
.level
) {
1017 return "Cannot understand this RAID level";
1019 /* RAID1 can convert to RAID1 with different disks, or
1020 * raid5 with 2 disks, or
1023 if (info
->new_level
> 1 &&
1024 (info
->component_size
& 7))
1025 return "Cannot convert RAID1 of this size - "
1026 "reduce size to multiple of 4K first.";
1027 if (info
->new_level
== 0) {
1028 if (info
->delta_disks
!= UnSet
&&
1029 info
->delta_disks
!= 0)
1030 return "Cannot change number of disks "
1031 "with RAID1->RAID0 conversion";
1033 re
->before
.data_disks
= 1;
1034 re
->after
.data_disks
= 1;
1037 if (info
->new_level
== 1) {
1038 if (info
->delta_disks
== UnSet
)
1039 /* Don't know what to do */
1040 return "no change requested for Growing RAID1";
1044 if (info
->array
.raid_disks
== 2 &&
1045 info
->new_level
== 5) {
1048 re
->before
.data_disks
= 1;
1049 if (info
->delta_disks
!= UnSet
&&
1050 info
->delta_disks
!= 0)
1051 re
->after
.data_disks
= 1 + info
->delta_disks
;
1053 re
->after
.data_disks
= 1;
1054 if (re
->after
.data_disks
< 1)
1055 return "Number of disks too small for RAID5";
1057 re
->before
.layout
= ALGORITHM_LEFT_SYMMETRIC
;
1058 info
->array
.chunk_size
= 65536;
1061 /* Could do some multi-stage conversions, but leave that to
1064 return "Impossibly level change request for RAID1";
1067 /* RAID10 can be converted from near mode to
1068 * RAID0 by removing some devices.
1069 * It can also be reshaped if the kernel supports
1072 switch (info
->new_level
) {
1074 if ((info
->array
.layout
& ~0xff) != 0x100)
1075 return "Cannot Grow RAID10 with far/offset layout";
1076 /* number of devices must be multiple of number of copies */
1077 if (info
->array
.raid_disks
% (info
->array
.layout
& 0xff))
1078 return "RAID10 layout too complex for Grow operation";
1080 new_disks
= (info
->array
.raid_disks
1081 / (info
->array
.layout
& 0xff));
1082 if (info
->delta_disks
== UnSet
)
1083 info
->delta_disks
= (new_disks
1084 - info
->array
.raid_disks
);
1086 if (info
->delta_disks
!= new_disks
- info
->array
.raid_disks
)
1087 return "New number of raid-devices impossible for RAID10";
1088 if (info
->new_chunk
&&
1089 info
->new_chunk
!= info
->array
.chunk_size
)
1090 return "Cannot change chunk-size with RAID10 Grow";
1094 re
->before
.data_disks
= new_disks
;
1095 re
->after
.data_disks
= re
->before
.data_disks
;
1099 near
= info
->array
.layout
& 0xff;
1100 far
= (info
->array
.layout
>> 8) & 0xff;
1101 offset
= info
->array
.layout
& 0x10000;
1102 if (far
> 1 && !offset
)
1103 return "Cannot reshape RAID10 in far-mode";
1104 copies
= near
* far
;
1106 old_chunk
= info
->array
.chunk_size
* far
;
1108 if (info
->new_layout
== UnSet
)
1109 info
->new_layout
= info
->array
.layout
;
1111 near
= info
->new_layout
& 0xff;
1112 far
= (info
->new_layout
>> 8) & 0xff;
1113 offset
= info
->new_layout
& 0x10000;
1114 if (far
> 1 && !offset
)
1115 return "Cannot reshape RAID10 to far-mode";
1116 if (near
* far
!= copies
)
1117 return "Cannot change number of copies"
1118 " when reshaping RAID10";
1120 if (info
->delta_disks
== UnSet
)
1121 info
->delta_disks
= 0;
1122 new_disks
= (info
->array
.raid_disks
+
1125 new_chunk
= info
->new_chunk
* far
;
1128 re
->before
.layout
= info
->array
.layout
;
1129 re
->before
.data_disks
= info
->array
.raid_disks
;
1130 re
->after
.layout
= info
->new_layout
;
1131 re
->after
.data_disks
= new_disks
;
1132 /* For RAID10 we don't do backup but do allow reshape,
1133 * so set backup_blocks to INVALID_SECTORS rather than
1135 * And there is no need to synchronise stripes on both
1136 * 'old' and 'new'. So the important
1137 * number is the minimum data_offset difference
1138 * which is the larger of (offset copies * chunk).
1140 re
->backup_blocks
= INVALID_SECTORS
;
1141 re
->min_offset_change
= max(old_chunk
, new_chunk
) / 512;
1142 if (new_disks
< re
->before
.data_disks
&&
1143 info
->space_after
< re
->min_offset_change
)
1144 /* Reduce component size by one chunk */
1145 re
->new_size
= (info
->component_size
-
1146 re
->min_offset_change
);
1148 re
->new_size
= info
->component_size
;
1149 re
->new_size
= re
->new_size
* new_disks
/ copies
;
1153 return "RAID10 can only be changed to RAID0";
1156 /* RAID0 can be converted to RAID10, or to RAID456 */
1157 if (info
->new_level
== 10) {
1158 if (info
->new_layout
== UnSet
&& info
->delta_disks
== UnSet
) {
1159 /* Assume near=2 layout */
1160 info
->new_layout
= 0x102;
1161 info
->delta_disks
= info
->array
.raid_disks
;
1163 if (info
->new_layout
== UnSet
) {
1164 int copies
= 1 + (info
->delta_disks
1165 / info
->array
.raid_disks
);
1166 if (info
->array
.raid_disks
* (copies
-1)
1167 != info
->delta_disks
)
1168 return "Impossible number of devices"
1169 " for RAID0->RAID10";
1170 info
->new_layout
= 0x100 + copies
;
1172 if (info
->delta_disks
== UnSet
) {
1173 int copies
= info
->new_layout
& 0xff;
1174 if (info
->new_layout
!= 0x100 + copies
)
1175 return "New layout impossible"
1176 " for RAID0->RAID10";;
1177 info
->delta_disks
= (copies
- 1) *
1178 info
->array
.raid_disks
;
1180 if (info
->new_chunk
&&
1181 info
->new_chunk
!= info
->array
.chunk_size
)
1182 return "Cannot change chunk-size with RAID0->RAID10";
1185 re
->before
.data_disks
= (info
->array
.raid_disks
+
1187 re
->after
.data_disks
= re
->before
.data_disks
;
1188 re
->before
.layout
= info
->new_layout
;
1192 /* RAID0 can also covert to RAID0/4/5/6 by first converting to
1193 * a raid4 style layout of the final level.
1195 switch (info
->new_level
) {
1200 re
->before
.layout
= 0;
1205 re
->before
.layout
= ALGORITHM_PARITY_N
;
1210 re
->before
.layout
= ALGORITHM_PARITY_N
;
1213 return "Impossible level change requested";
1215 re
->before
.data_disks
= info
->array
.raid_disks
;
1216 /* determining 'after' layout happens outside this 'switch' */
1220 info
->array
.layout
= ALGORITHM_PARITY_N
;
1222 switch (info
->new_level
) {
1226 re
->level
= info
->array
.level
;
1227 re
->before
.data_disks
= info
->array
.raid_disks
- 1;
1228 re
->before
.layout
= info
->array
.layout
;
1232 re
->before
.data_disks
= info
->array
.raid_disks
- 1;
1233 re
->before
.layout
= info
->array
.layout
;
1238 re
->before
.data_disks
= info
->array
.raid_disks
- 1;
1239 switch (info
->array
.layout
) {
1240 case ALGORITHM_LEFT_ASYMMETRIC
:
1241 re
->before
.layout
= ALGORITHM_LEFT_ASYMMETRIC_6
;
1243 case ALGORITHM_RIGHT_ASYMMETRIC
:
1244 re
->before
.layout
= ALGORITHM_RIGHT_ASYMMETRIC_6
;
1246 case ALGORITHM_LEFT_SYMMETRIC
:
1247 re
->before
.layout
= ALGORITHM_LEFT_SYMMETRIC_6
;
1249 case ALGORITHM_RIGHT_SYMMETRIC
:
1250 re
->before
.layout
= ALGORITHM_RIGHT_SYMMETRIC_6
;
1252 case ALGORITHM_PARITY_0
:
1253 re
->before
.layout
= ALGORITHM_PARITY_0_6
;
1255 case ALGORITHM_PARITY_N
:
1256 re
->before
.layout
= ALGORITHM_PARITY_N_6
;
1259 return "Cannot convert an array with this layout";
1263 if (info
->array
.raid_disks
!= 2)
1264 return "Can only convert a 2-device array to RAID1";
1265 if (info
->delta_disks
!= UnSet
&&
1266 info
->delta_disks
!= 0)
1267 return "Cannot set raid_disk when "
1268 "converting RAID5->RAID1";
1270 info
->new_chunk
= 0;
1273 return "Impossible level change requested";
1277 switch (info
->new_level
) {
1283 re
->before
.data_disks
= info
->array
.raid_disks
- 2;
1284 re
->before
.layout
= info
->array
.layout
;
1287 return "Impossible level change requested";
1292 /* If we reached here then it looks like a re-stripe is
1293 * happening. We have determined the intermediate level
1294 * and initial raid_disks/layout and stored these in 're'.
1296 * We need to deduce the final layout that can be atomically
1297 * converted to the end state.
1299 switch (info
->new_level
) {
1301 /* We can only get to RAID0 from RAID4 or RAID5
1302 * with appropriate layout and one extra device
1304 if (re
->level
!= 4 && re
->level
!= 5)
1305 return "Cannot covert to RAID0 from this level";
1307 switch (re
->level
) {
1309 re
->before
.layout
= 0;
1310 re
->after
.layout
= 0;
1313 re
->after
.layout
= ALGORITHM_PARITY_N
;
1319 /* We can only get to RAID4 from RAID5 */
1320 if (re
->level
!= 4 && re
->level
!= 5)
1321 return "Cannot convert to RAID4 from this level";
1323 switch (re
->level
) {
1325 re
->before
.layout
= 0;
1326 re
->after
.layout
= 0;
1329 re
->after
.layout
= ALGORITHM_PARITY_N
;
1335 /* We get to RAID5 from RAID5 or RAID6 */
1336 if (re
->level
!= 5 && re
->level
!= 6)
1337 return "Cannot convert to RAID5 from this level";
1339 switch (re
->level
) {
1341 if (info
->new_layout
== UnSet
)
1342 re
->after
.layout
= re
->before
.layout
;
1344 re
->after
.layout
= info
->new_layout
;
1347 if (info
->new_layout
== UnSet
)
1348 info
->new_layout
= re
->before
.layout
;
1350 /* after.layout needs to be raid6 version of new_layout */
1351 if (info
->new_layout
== ALGORITHM_PARITY_N
)
1352 re
->after
.layout
= ALGORITHM_PARITY_N
;
1355 char *ls
= map_num(r5layout
, info
->new_layout
);
1358 /* Current RAID6 layout has a RAID5
1361 strcat(strcpy(layout
, ls
), "-6");
1362 l
= map_name(r6layout
, layout
);
1364 return "Cannot find RAID6 layout"
1367 /* Current RAID6 has no equivalent.
1368 * If it is already a '-6' layout we
1369 * can leave it unchanged, else we must
1372 ls
= map_num(r6layout
, info
->new_layout
);
1374 strcmp(ls
+strlen(ls
)-2, "-6") != 0)
1375 return "Please specify new layout";
1376 l
= info
->new_layout
;
1378 re
->after
.layout
= l
;
1384 /* We must already be at level 6 */
1386 return "Impossible level change";
1387 if (info
->new_layout
== UnSet
)
1388 re
->after
.layout
= info
->array
.layout
;
1390 re
->after
.layout
= info
->new_layout
;
1393 return "Impossible level change requested";
1395 if (info
->delta_disks
== UnSet
)
1396 info
->delta_disks
= delta_parity
;
1398 re
->after
.data_disks
= (re
->before
.data_disks
1401 switch (re
->level
) {
1402 case 6: re
->parity
= 2;
1405 case 5: re
->parity
= 1;
1407 default: re
->parity
= 0;
1410 /* So we have a restripe operation, we need to calculate the number
1411 * of blocks per reshape operation.
1413 if (info
->new_chunk
== 0)
1414 info
->new_chunk
= info
->array
.chunk_size
;
1415 if (re
->after
.data_disks
== re
->before
.data_disks
&&
1416 re
->after
.layout
== re
->before
.layout
&&
1417 info
->new_chunk
== info
->array
.chunk_size
) {
1418 /* Nothing to change, can change level immediately. */
1419 re
->level
= info
->new_level
;
1420 re
->backup_blocks
= 0;
1423 if (re
->after
.data_disks
== 1 && re
->before
.data_disks
== 1) {
1424 /* chunk and layout changes make no difference */
1425 re
->level
= info
->new_level
;
1426 re
->backup_blocks
= 0;
1430 if (re
->after
.data_disks
== re
->before
.data_disks
&&
1431 get_linux_version() < 2006032)
1432 return "in-place reshape is not safe before 2.6.32 - sorry.";
1434 if (re
->after
.data_disks
< re
->before
.data_disks
&&
1435 get_linux_version() < 2006030)
1436 return "reshape to fewer devices is not supported before 2.6.30 - sorry.";
1438 re
->backup_blocks
= compute_backup_blocks(
1439 info
->new_chunk
, info
->array
.chunk_size
,
1440 re
->after
.data_disks
,
1441 re
->before
.data_disks
);
1442 re
->min_offset_change
= re
->backup_blocks
/ re
->before
.data_disks
;
1444 re
->new_size
= info
->component_size
* re
->after
.data_disks
;
1448 static int set_array_size(struct supertype
*st
, struct mdinfo
*sra
,
1451 struct mdinfo
*info
;
1455 if ((st
== NULL
) || (sra
== NULL
))
1458 if (text_version
== NULL
)
1459 text_version
= sra
->text_version
;
1460 subarray
= strchr(text_version
+1, '/')+1;
1461 info
= st
->ss
->container_content(st
, subarray
);
1463 unsigned long long current_size
= 0;
1464 unsigned long long new_size
=
1465 info
->custom_array_size
/2;
1467 if (sysfs_get_ll(sra
, NULL
, "array_size", ¤t_size
) == 0 &&
1468 new_size
> current_size
) {
1469 if (sysfs_set_num(sra
, NULL
, "array_size", new_size
)
1471 dprintf("Error: Cannot set array size");
1474 dprintf("Array size changed");
1476 dprintf(" from %llu to %llu.\n",
1477 current_size
, new_size
);
1481 dprintf("Error: set_array_size(): info pointer in NULL\n");
1486 static int reshape_array(char *container
, int fd
, char *devname
,
1487 struct supertype
*st
, struct mdinfo
*info
,
1488 int force
, struct mddev_dev
*devlist
,
1489 unsigned long long data_offset
,
1490 char *backup_file
, int verbose
, int forked
,
1491 int restart
, int freeze_reshape
);
1492 static int reshape_container(char *container
, char *devname
,
1494 struct supertype
*st
,
1495 struct mdinfo
*info
,
1498 int verbose
, int restart
, int freeze_reshape
);
1500 int Grow_reshape(char *devname
, int fd
,
1501 struct mddev_dev
*devlist
,
1502 unsigned long long data_offset
,
1503 struct context
*c
, struct shape
*s
)
1505 /* Make some changes in the shape of an array.
1506 * The kernel must support the change.
1508 * There are three different changes. Each can trigger
1509 * a resync or recovery so we freeze that until we have
1510 * requested everything (if kernel supports freezing - 2.6.30).
1512 * - change size (i.e. component_size)
1514 * - change layout/chunksize/ndisks
1516 * The last can require a reshape. It is different on different
1517 * levels so we need to check the level before actioning it.
1518 * Some times the level change needs to be requested after the
1519 * reshape (e.g. raid6->raid5, raid5->raid0)
1522 struct mdu_array_info_s array
;
1524 struct supertype
*st
;
1525 char *subarray
= NULL
;
1529 char *container
= NULL
;
1532 struct mddev_dev
*dv
;
1539 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) < 0) {
1540 pr_err("%s is not an active md array - aborting\n",
1544 if (data_offset
!= INVALID_SECTORS
&& array
.level
!= 10
1545 && (array
.level
< 4 || array
.level
> 6)) {
1546 pr_err("--grow --data-offset not yet supported\n");
1551 (s
->chunk
|| s
->level
!= UnSet
|| s
->layout_str
|| s
->raiddisks
)) {
1552 pr_err("cannot change component size at the same time "
1553 "as other changes.\n"
1554 " Change size first, then check data is intact before "
1555 "making other changes.\n");
1559 if (s
->raiddisks
&& s
->raiddisks
< array
.raid_disks
&& array
.level
> 1 &&
1560 get_linux_version() < 2006032 &&
1561 !check_env("MDADM_FORCE_FEWER")) {
1562 pr_err("reducing the number of devices is not safe before Linux 2.6.32\n"
1563 " Please use a newer kernel\n");
1567 st
= super_by_fd(fd
, &subarray
);
1569 pr_err("Unable to determine metadata format for %s\n", devname
);
1572 if (s
->raiddisks
> st
->max_devs
) {
1573 pr_err("Cannot increase raid-disks on this array"
1574 " beyond %d\n", st
->max_devs
);
1578 /* in the external case we need to check that the requested reshape is
1579 * supported, and perform an initial check that the container holds the
1580 * pre-requisite spare devices (mdmon owns final validation)
1582 if (st
->ss
->external
) {
1586 container
= st
->container_devnm
;
1587 cfd
= open_dev_excl(st
->container_devnm
);
1589 container
= st
->devnm
;
1591 cfd
= open_dev_excl(st
->devnm
);
1595 pr_err("Unable to open container for %s\n",
1601 rv
= st
->ss
->load_container(st
, cfd
, NULL
);
1604 pr_err("Cannot read superblock for %s\n",
1610 /* check if operation is supported for metadata handler */
1611 if (st
->ss
->container_content
) {
1612 struct mdinfo
*cc
= NULL
;
1613 struct mdinfo
*content
= NULL
;
1615 cc
= st
->ss
->container_content(st
, subarray
);
1616 for (content
= cc
; content
; content
= content
->next
) {
1617 int allow_reshape
= 1;
1619 /* check if reshape is allowed based on metadata
1620 * indications stored in content.array.status
1622 if (content
->array
.state
& (1<<MD_SB_BLOCK_VOLUME
))
1624 if (content
->array
.state
1625 & (1<<MD_SB_BLOCK_CONTAINER_RESHAPE
))
1627 if (!allow_reshape
) {
1628 pr_err("cannot reshape arrays in"
1629 " container with unsupported"
1630 " metadata: %s(%s)\n",
1631 devname
, container
);
1639 if (mdmon_running(container
))
1640 st
->update_tail
= &st
->updates
;
1644 for (dv
= devlist
; dv
; dv
= dv
->next
)
1646 if (s
->raiddisks
> array
.raid_disks
&&
1647 array
.spare_disks
+added_disks
< (s
->raiddisks
- array
.raid_disks
) &&
1649 pr_err("Need %d spare%s to avoid degraded array,"
1650 " and only have %d.\n"
1651 " Use --force to over-ride this check.\n",
1652 s
->raiddisks
- array
.raid_disks
,
1653 s
->raiddisks
- array
.raid_disks
== 1 ? "" : "s",
1654 array
.spare_disks
+ added_disks
);
1658 sra
= sysfs_read(fd
, NULL
, GET_LEVEL
| GET_DISKS
| GET_DEVS
1659 | GET_STATE
| GET_VERSION
);
1661 if (st
->ss
->external
&& subarray
== NULL
) {
1662 array
.level
= LEVEL_CONTAINER
;
1663 sra
->array
.level
= LEVEL_CONTAINER
;
1666 pr_err("failed to read sysfs parameters for %s\n",
1670 frozen
= freeze(st
);
1672 /* freeze() already spewed the reason */
1675 } else if (frozen
< 0) {
1676 pr_err("%s is performing resync/recovery and cannot"
1677 " be reshaped\n", devname
);
1682 /* ========= set size =============== */
1683 if (s
->size
> 0 && (s
->size
== MAX_SIZE
|| s
->size
!= (unsigned)array
.size
)) {
1684 unsigned long long orig_size
= get_component_size(fd
)/2;
1685 unsigned long long min_csize
;
1687 int raid0_takeover
= 0;
1690 orig_size
= (unsigned) array
.size
;
1692 if (orig_size
== 0) {
1693 pr_err("Cannot set device size in this type of array.\n");
1698 if (reshape_super(st
, s
->size
, UnSet
, UnSet
, 0, 0, UnSet
, NULL
,
1699 devname
, APPLY_METADATA_CHANGES
, c
->verbose
> 0)) {
1704 if (st
->ss
->external
) {
1705 /* metadata can have size limitation
1706 * update size value according to metadata information
1708 struct mdinfo
*sizeinfo
=
1709 st
->ss
->container_content(st
, subarray
);
1711 unsigned long long new_size
=
1712 sizeinfo
->custom_array_size
/2;
1713 int data_disks
= get_data_disks(
1714 sizeinfo
->array
.level
,
1715 sizeinfo
->array
.layout
,
1716 sizeinfo
->array
.raid_disks
);
1717 new_size
/= data_disks
;
1718 dprintf("Metadata size correction from %llu to "
1719 "%llu (%llu)\n", orig_size
, new_size
,
1720 new_size
* data_disks
);
1722 sysfs_free(sizeinfo
);
1726 /* Update the size of each member device in case
1727 * they have been resized. This will never reduce
1728 * below the current used-size. The "size" attribute
1729 * understands '0' to mean 'max'.
1733 for (mdi
= sra
->devs
; mdi
; mdi
= mdi
->next
) {
1734 if (sysfs_set_num(sra
, mdi
, "size",
1735 s
->size
== MAX_SIZE
? 0 : s
->size
) < 0) {
1736 /* Probably kernel refusing to let us
1737 * reduce the size - not an error.
1741 if (array
.not_persistent
== 0 &&
1742 array
.major_version
== 0 &&
1743 get_linux_version() < 3001000) {
1744 /* Dangerous to allow size to exceed 2TB */
1745 unsigned long long csize
;
1746 if (sysfs_get_ll(sra
, mdi
, "size", &csize
) == 0) {
1747 if (csize
>= 2ULL*1024*1024*1024)
1748 csize
= 2ULL*1024*1024*1024;
1749 if ((min_csize
== 0 || (min_csize
1756 pr_err("Cannot set size on "
1757 "array members.\n");
1758 goto size_change_error
;
1760 if (min_csize
&& s
->size
> min_csize
) {
1761 pr_err("Cannot safely make this array "
1762 "use more than 2TB per device on this kernel.\n");
1764 goto size_change_error
;
1766 if (min_csize
&& s
->size
== MAX_SIZE
) {
1767 /* Don't let the kernel choose a size - it will get
1770 pr_err("Limited v0.90 array to "
1771 "2TB per device\n");
1772 s
->size
= min_csize
;
1774 if (st
->ss
->external
) {
1775 if (sra
->array
.level
== 0) {
1776 rv
= sysfs_set_str(sra
, NULL
, "level",
1780 /* get array parametes after takeover
1781 * to chane one parameter at time only
1783 rv
= ioctl(fd
, GET_ARRAY_INFO
, &array
);
1786 /* make sure mdmon is
1787 * aware of the new level */
1788 if (!mdmon_running(st
->container_devnm
))
1789 start_mdmon(st
->container_devnm
);
1790 ping_monitor(container
);
1791 if (mdmon_running(st
->container_devnm
) &&
1792 st
->update_tail
== NULL
)
1793 st
->update_tail
= &st
->updates
;
1796 if (s
->size
== MAX_SIZE
)
1798 array
.size
= s
->size
;
1799 if ((unsigned)array
.size
!= s
->size
) {
1800 /* got truncated to 32bit, write to
1801 * component_size instead
1804 rv
= sysfs_set_num(sra
, NULL
,
1805 "component_size", s
->size
);
1809 rv
= ioctl(fd
, SET_ARRAY_INFO
, &array
);
1811 /* manage array size when it is managed externally
1813 if ((rv
== 0) && st
->ss
->external
)
1814 rv
= set_array_size(st
, sra
, sra
->text_version
);
1817 if (raid0_takeover
) {
1818 /* do not recync non-existing parity,
1819 * we will drop it anyway
1821 sysfs_set_str(sra
, NULL
, "sync_action", "frozen");
1822 /* go back to raid0, drop parity disk
1824 sysfs_set_str(sra
, NULL
, "level", "raid0");
1825 ioctl(fd
, GET_ARRAY_INFO
, &array
);
1832 /* restore metadata */
1833 if (reshape_super(st
, orig_size
, UnSet
, UnSet
, 0, 0,
1834 UnSet
, NULL
, devname
,
1835 ROLLBACK_METADATA_CHANGES
,
1838 pr_err("Cannot set device size for %s: %s\n",
1839 devname
, strerror(err
));
1841 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
1842 cont_err("Bitmap must be removed before size can be changed\n");
1846 if (s
->assume_clean
) {
1847 /* This will fail on kernels older than 3.0 unless
1848 * a backport has been arranged.
1851 sysfs_set_str(sra
, NULL
, "resync_start", "none") < 0)
1852 pr_err("--assume-clean not supported with --grow on this kernel\n");
1854 ioctl(fd
, GET_ARRAY_INFO
, &array
);
1855 s
->size
= get_component_size(fd
)/2;
1857 s
->size
= array
.size
;
1858 if (c
->verbose
>= 0) {
1859 if (s
->size
== orig_size
)
1860 pr_err("component size of %s "
1861 "unchanged at %lluK\n",
1864 pr_err("component size of %s "
1865 "has been set to %lluK\n",
1869 } else if (array
.level
!= LEVEL_CONTAINER
) {
1870 s
->size
= get_component_size(fd
)/2;
1872 s
->size
= array
.size
;
1875 /* See if there is anything else to do */
1876 if ((s
->level
== UnSet
|| s
->level
== array
.level
) &&
1877 (s
->layout_str
== NULL
) &&
1878 (s
->chunk
== 0 || s
->chunk
== array
.chunk_size
) &&
1879 data_offset
== INVALID_SECTORS
&&
1880 (s
->raiddisks
== 0 || s
->raiddisks
== array
.raid_disks
)) {
1881 /* Nothing more to do */
1882 if (!changed
&& c
->verbose
>= 0)
1883 pr_err("%s: no change requested\n",
1888 /* ========= check for Raid10/Raid1 -> Raid0 conversion ===============
1889 * current implementation assumes that following conditions must be met:
1892 * - near_copies == 2
1894 if ((s
->level
== 0 && array
.level
== 10 && sra
&&
1895 array
.layout
== ((1 << 8) + 2) && !(array
.raid_disks
& 1)) ||
1896 (s
->level
== 0 && array
.level
== 1 && sra
)) {
1898 err
= remove_disks_for_takeover(st
, sra
, array
.layout
);
1900 dprintf(Name
": Array cannot be reshaped\n");
1906 /* Make sure mdmon has seen the device removal
1907 * and updated metadata before we continue with
1911 ping_monitor(container
);
1914 memset(&info
, 0, sizeof(info
));
1916 sysfs_init(&info
, fd
, NULL
);
1917 strcpy(info
.text_version
, sra
->text_version
);
1918 info
.component_size
= s
->size
*2;
1919 info
.new_level
= s
->level
;
1920 info
.new_chunk
= s
->chunk
* 1024;
1921 if (info
.array
.level
== LEVEL_CONTAINER
) {
1922 info
.delta_disks
= UnSet
;
1923 info
.array
.raid_disks
= s
->raiddisks
;
1924 } else if (s
->raiddisks
)
1925 info
.delta_disks
= s
->raiddisks
- info
.array
.raid_disks
;
1927 info
.delta_disks
= UnSet
;
1928 if (s
->layout_str
== NULL
) {
1929 info
.new_layout
= UnSet
;
1930 if (info
.array
.level
== 6 &&
1931 (info
.new_level
== 6 || info
.new_level
== UnSet
) &&
1932 info
.array
.layout
>= 16) {
1933 pr_err("%s has a non-standard layout. If you"
1934 " wish to preserve this\n", devname
);
1935 cont_err("during the reshape, please specify"
1936 " --layout=preserve\n");
1937 cont_err("If you want to change it, specify a"
1938 " layout or use --layout=normalise\n");
1942 } else if (strcmp(s
->layout_str
, "normalise") == 0 ||
1943 strcmp(s
->layout_str
, "normalize") == 0) {
1944 /* If we have a -6 RAID6 layout, remove the '-6'. */
1945 info
.new_layout
= UnSet
;
1946 if (info
.array
.level
== 6 && info
.new_level
== UnSet
) {
1948 strcpy(l
, map_num(r6layout
, info
.array
.layout
));
1949 h
= strrchr(l
, '-');
1950 if (h
&& strcmp(h
, "-6") == 0) {
1952 info
.new_layout
= map_name(r6layout
, l
);
1955 pr_err("%s is only meaningful when reshaping"
1956 " a RAID6 array.\n", s
->layout_str
);
1960 } else if (strcmp(s
->layout_str
, "preserve") == 0) {
1961 /* This means that a non-standard RAID6 layout
1964 * - When reshape a RAID6 (e.g. adding a device)
1965 * which is in a non-standard layout, it is OK
1966 * to preserve that layout.
1967 * - When converting a RAID5 to RAID6, leave it in
1968 * the XXX-6 layout, don't re-layout.
1970 if (info
.array
.level
== 6 && info
.new_level
== UnSet
)
1971 info
.new_layout
= info
.array
.layout
;
1972 else if (info
.array
.level
== 5 && info
.new_level
== 6) {
1974 strcpy(l
, map_num(r5layout
, info
.array
.layout
));
1976 info
.new_layout
= map_name(r6layout
, l
);
1978 pr_err("%s in only meaningful when reshaping"
1979 " to RAID6\n", s
->layout_str
);
1984 int l
= info
.new_level
;
1986 l
= info
.array
.level
;
1989 info
.new_layout
= map_name(r5layout
, s
->layout_str
);
1992 info
.new_layout
= map_name(r6layout
, s
->layout_str
);
1995 info
.new_layout
= parse_layout_10(s
->layout_str
);
1998 info
.new_layout
= parse_layout_faulty(s
->layout_str
);
2001 pr_err("layout not meaningful"
2002 " with this level\n");
2006 if (info
.new_layout
== UnSet
) {
2007 pr_err("layout %s not understood"
2008 " for this level\n",
2015 if (array
.level
== LEVEL_FAULTY
) {
2016 if (s
->level
!= UnSet
&& s
->level
!= array
.level
) {
2017 pr_err("cannot change level of Faulty device\n");
2021 pr_err("cannot set chunksize of Faulty device\n");
2024 if (s
->raiddisks
&& s
->raiddisks
!= 1) {
2025 pr_err("cannot set raid_disks of Faulty device\n");
2028 if (s
->layout_str
) {
2029 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) != 0) {
2030 dprintf("Cannot get array information.\n");
2033 array
.layout
= info
.new_layout
;
2034 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
2035 pr_err("failed to set new layout\n");
2037 } else if (c
->verbose
>= 0)
2038 printf("layout for %s set to %d\n",
2039 devname
, array
.layout
);
2041 } else if (array
.level
== LEVEL_CONTAINER
) {
2042 /* This change is to be applied to every array in the
2043 * container. This is only needed when the metadata imposes
2044 * restraints of the various arrays in the container.
2045 * Currently we only know that IMSM requires all arrays
2046 * to have the same number of devices so changing the
2047 * number of devices (On-Line Capacity Expansion) must be
2048 * performed at the level of the container
2050 rv
= reshape_container(container
, devname
, -1, st
, &info
,
2051 c
->force
, c
->backup_file
, c
->verbose
, 0, 0);
2054 /* get spare devices from external metadata
2056 if (st
->ss
->external
) {
2057 struct mdinfo
*info2
;
2059 info2
= st
->ss
->container_content(st
, subarray
);
2061 info
.array
.spare_disks
=
2062 info2
->array
.spare_disks
;
2067 /* Impose these changes on a single array. First
2068 * check that the metadata is OK with the change. */
2070 if (reshape_super(st
, 0, info
.new_level
,
2071 info
.new_layout
, info
.new_chunk
,
2072 info
.array
.raid_disks
, info
.delta_disks
,
2073 c
->backup_file
, devname
, APPLY_METADATA_CHANGES
,
2079 rv
= reshape_array(container
, fd
, devname
, st
, &info
, c
->force
,
2080 devlist
, data_offset
, c
->backup_file
, c
->verbose
,
2091 /* verify_reshape_position()
2092 * Function checks if reshape position in metadata is not farther
2093 * than position in md.
2095 * 0 : not valid sysfs entry
2096 * it can be caused by not started reshape, it should be started
2097 * by reshape array or raid0 array is before takeover
2098 * -1 : error, reshape position is obviously wrong
2099 * 1 : success, reshape progress correct or updated
2101 static int verify_reshape_position(struct mdinfo
*info
, int level
)
2107 /* read sync_max, failure can mean raid0 array */
2108 rv
= sysfs_get_str(info
, NULL
, "sync_max", buf
, 40);
2112 unsigned long long position
= strtoull(buf
, &ep
, 0);
2114 dprintf(Name
": Read sync_max sysfs entry is: %s\n", buf
);
2115 if (!(ep
== buf
|| (*ep
!= 0 && *ep
!= '\n' && *ep
!= ' '))) {
2116 position
*= get_data_disks(level
,
2118 info
->array
.raid_disks
);
2119 if (info
->reshape_progress
< position
) {
2120 dprintf("Corrected reshape progress (%llu) to "
2121 "md position (%llu)\n",
2122 info
->reshape_progress
, position
);
2123 info
->reshape_progress
= position
;
2125 } else if (info
->reshape_progress
> position
) {
2126 pr_err("Fatal error: array "
2127 "reshape was not properly frozen "
2128 "(expected reshape position is %llu, "
2129 "but reshape progress is %llu.\n",
2130 position
, info
->reshape_progress
);
2133 dprintf("Reshape position in md and metadata "
2138 } else if (rv
== 0) {
2139 /* for valid sysfs entry, 0-length content
2140 * should be indicated as error
2148 static int set_new_data_offset(struct mdinfo
*sra
, struct supertype
*st
,
2149 char *devname
, int delta_disks
,
2150 unsigned long long data_offset
,
2151 unsigned long long min
)
2156 unsigned long long before
, after
;
2158 /* Need to find min space before and after so same is used
2161 before
= UINT64_MAX
;
2163 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
2167 struct supertype
*st2
;
2168 struct mdinfo info2
;
2170 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
2172 dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 0);
2173 dfd
= dev_open(dn
, O_RDONLY
);
2175 pr_err("%s: cannot open component %s\n",
2176 devname
, dn
? dn
: "-unknown-");
2179 st2
= dup_super(st
);
2180 rv
= st2
->ss
->load_super(st2
,dfd
, NULL
);
2184 pr_err("%s: cannot get superblock from %s\n",
2188 st2
->ss
->getinfo_super(st2
, &info2
, NULL
);
2189 st2
->ss
->free_super(st2
);
2191 if (info2
.space_before
== 0 &&
2192 info2
.space_after
== 0) {
2193 /* Metadata doesn't support data_offset changes */
2196 if (before
> info2
.space_before
)
2197 before
= info2
.space_before
;
2198 if (after
> info2
.space_after
)
2199 after
= info2
.space_after
;
2201 if (data_offset
!= INVALID_SECTORS
) {
2203 if (info2
.data_offset
== data_offset
) {
2204 pr_err("%s: already has that data_offset\n",
2208 if (data_offset
< info2
.data_offset
)
2212 } else if ((data_offset
<= info2
.data_offset
&& dir
== 1) ||
2213 (data_offset
>= info2
.data_offset
&& dir
== -1)) {
2214 pr_err("%s: differing data offsets on devices make this --data-offset setting impossible\n",
2220 if (before
== UINT64_MAX
)
2221 /* impossible really, there must be no devices */
2224 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
2225 char *dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 0);
2227 struct mdinfo info2
;
2228 if (delta_disks
< 0) {
2229 /* Don't need any space as array is shrinking
2230 * just move data_offset up by min
2232 if (data_offset
== INVALID_SECTORS
)
2233 info2
.new_data_offset
= info2
.data_offset
+ min
;
2235 if (data_offset
< info2
.data_offset
+ min
) {
2236 pr_err("--data-offset too small for %s\n",
2240 info2
.new_data_offset
= data_offset
;
2242 } else if (delta_disks
> 0) {
2243 /* need space before */
2245 pr_err("Insufficient head-space for reshape on %s\n",
2249 if (data_offset
== INVALID_SECTORS
)
2250 info2
.new_data_offset
= info2
.data_offset
- min
;
2252 if (data_offset
> info2
.data_offset
- min
) {
2253 pr_err("--data-offset too large for %s\n",
2257 info2
.new_data_offset
= data_offset
;
2261 /* can move up or down. If 'data_offset'
2262 * was set we would have already decided,
2263 * so just choose direction with most space.
2265 if (info2
.space_before
> info2
.space_after
)
2269 sysfs_set_str(sra
, NULL
, "reshape_direction",
2270 dir
== 1 ? "backwards" : "forwards");
2274 case 1: /* Increase data offset */
2276 pr_err("Insufficient tail-space for reshape on %s\n",
2280 if (data_offset
!= INVALID_SECTORS
&&
2281 data_offset
< info2
.data_offset
+ min
) {
2282 pr_err("--data-offset too small on %s\n",
2286 if (data_offset
!= INVALID_SECTORS
)
2287 info2
.new_data_offset
= data_offset
;
2289 unsigned long long off
= after
/ 2;
2293 info2
.new_data_offset
=
2294 info2
.data_offset
+ off
;
2297 case -1: /* Decrease data offset */
2299 pr_err("insufficient head-room on %s\n",
2303 if (data_offset
!= INVALID_SECTORS
&&
2304 data_offset
< info2
.data_offset
- min
) {
2305 pr_err("--data-offset too small on %s\n",
2309 if (data_offset
!= INVALID_SECTORS
)
2310 info2
.new_data_offset
= data_offset
;
2312 unsigned long long off
= before
/ 2;
2316 info2
.new_data_offset
=
2317 info2
.data_offset
- off
;
2322 if (sysfs_set_num(sra
, sd
, "new_offset",
2323 info2
.new_data_offset
) < 0) {
2326 if (errno
== E2BIG
&& data_offset
!= INVALID_SECTORS
) {
2327 pr_err("data-offset is too big for %s\n",
2331 if (sd
== sra
->devs
&&
2332 (errno
== ENOENT
|| errno
== E2BIG
))
2333 /* Early kernel, no 'new_offset' file,
2334 * or kernel doesn't like us.
2335 * For RAID5/6 this is not fatal
2338 pr_err("Cannot set new_offset for %s\n",
2348 static int raid10_reshape(char *container
, int fd
, char *devname
,
2349 struct supertype
*st
, struct mdinfo
*info
,
2350 struct reshape
*reshape
,
2351 unsigned long long data_offset
,
2352 int force
, int verbose
)
2354 /* Changing raid_disks, layout, chunksize or possibly
2355 * just data_offset for a RAID10.
2356 * We must always change data_offset. We change by at least
2357 * ->min_offset_change which is the largest of the old and new
2359 * If raid_disks is increasing, then data_offset must decrease
2360 * by at least this copy size.
2361 * If raid_disks is unchanged, data_offset must increase or
2362 * decrease by at least min_offset_change but preferably by much more.
2363 * We choose half of the available space.
2364 * If raid_disks is decreasing, data_offset must increase by
2365 * at least min_offset_change. To allow of this, component_size
2366 * must be decreased by the same amount.
2368 * So we calculate the required minimum and direction, possibly
2369 * reduce the component_size, then iterate through the devices
2370 * and set the new_data_offset.
2371 * If that all works, we set chunk_size, layout, raid_disks, and start
2375 unsigned long long min
;
2378 sra
= sysfs_read(fd
, NULL
,
2379 GET_COMPONENT
|GET_DEVS
|GET_OFFSET
|GET_STATE
|GET_CHUNK
2382 pr_err("%s: Cannot get array details from sysfs\n",
2386 min
= reshape
->min_offset_change
;
2388 if (info
->delta_disks
)
2389 sysfs_set_str(sra
, NULL
, "reshape_direction",
2390 info
->delta_disks
< 0 ? "backwards" : "forwards");
2391 if (info
->delta_disks
< 0 &&
2392 info
->space_after
< min
) {
2393 int rv
= sysfs_set_num(sra
, NULL
, "component_size",
2394 (sra
->component_size
-
2397 pr_err("cannot reduce component size\n");
2401 err
= set_new_data_offset(sra
, st
, devname
, info
->delta_disks
, data_offset
,
2404 pr_err("Cannot set new_data_offset: RAID10 reshape not\n");
2405 cont_err("supported on this kernel\n");
2411 if (!err
&& sysfs_set_num(sra
, NULL
, "chunk_size", info
->new_chunk
) < 0)
2413 if (!err
&& sysfs_set_num(sra
, NULL
, "layout", reshape
->after
.layout
) < 0)
2415 if (!err
&& sysfs_set_num(sra
, NULL
, "raid_disks",
2416 info
->array
.raid_disks
+ info
->delta_disks
) < 0)
2418 if (!err
&& sysfs_set_str(sra
, NULL
, "sync_action", "reshape") < 0)
2421 pr_err("Cannot set array shape for %s\n",
2424 (info
->array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2425 cont_err(" Bitmap must be removed before"
2426 " shape can be changed\n");
2436 static void get_space_after(int fd
, struct supertype
*st
, struct mdinfo
*info
)
2438 struct mdinfo
*sra
, *sd
;
2439 /* Initialisation to silence compiler warning */
2440 unsigned long long min_space_before
= 0, min_space_after
= 0;
2443 sra
= sysfs_read(fd
, NULL
, GET_DEVS
);
2446 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
2449 struct supertype
*st2
;
2450 struct mdinfo info2
;
2452 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
2454 dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 0);
2455 dfd
= dev_open(dn
, O_RDONLY
);
2458 st2
= dup_super(st
);
2459 if (st2
->ss
->load_super(st2
,dfd
, NULL
)) {
2465 st2
->ss
->getinfo_super(st2
, &info2
, NULL
);
2466 st2
->ss
->free_super(st2
);
2469 min_space_before
> info2
.space_before
)
2470 min_space_before
= info2
.space_before
;
2472 min_space_after
> info2
.space_after
)
2473 min_space_after
= info2
.space_after
;
2476 if (sd
== NULL
&& !first
) {
2477 info
->space_after
= min_space_after
;
2478 info
->space_before
= min_space_before
;
2483 static void update_cache_size(char *container
, struct mdinfo
*sra
,
2484 struct mdinfo
*info
,
2485 int disks
, unsigned long long blocks
)
2487 /* Check that the internal stripe cache is
2488 * large enough, or it won't work.
2489 * It must hold at least 4 stripes of the larger
2492 unsigned long cache
;
2493 cache
= max(info
->array
.chunk_size
, info
->new_chunk
);
2494 cache
*= 4; /* 4 stripes minimum */
2495 cache
/= 512; /* convert to sectors */
2496 /* make sure there is room for 'blocks' with a bit to spare */
2497 if (cache
< 16 + blocks
/ disks
)
2498 cache
= 16 + blocks
/ disks
;
2499 cache
/= (4096/512); /* Covert from sectors to pages */
2501 if (sra
->cache_size
< cache
)
2502 subarray_set_num(container
, sra
, "stripe_cache_size",
2506 static int impose_reshape(struct mdinfo
*sra
,
2507 struct mdinfo
*info
,
2508 struct supertype
*st
,
2511 char *devname
, char *container
,
2512 struct reshape
*reshape
)
2514 struct mdu_array_info_s array
;
2516 sra
->new_chunk
= info
->new_chunk
;
2519 /* for external metadata checkpoint saved by mdmon can be lost
2520 * or missed /due to e.g. crash/. Check if md is not during
2521 * restart farther than metadata points to.
2522 * If so, this means metadata information is obsolete.
2524 if (st
->ss
->external
)
2525 verify_reshape_position(info
, reshape
->level
);
2526 sra
->reshape_progress
= info
->reshape_progress
;
2528 sra
->reshape_progress
= 0;
2529 if (reshape
->after
.data_disks
< reshape
->before
.data_disks
)
2530 /* start from the end of the new array */
2531 sra
->reshape_progress
= (sra
->component_size
2532 * reshape
->after
.data_disks
);
2535 ioctl(fd
, GET_ARRAY_INFO
, &array
);
2536 if (info
->array
.chunk_size
== info
->new_chunk
&&
2537 reshape
->before
.layout
== reshape
->after
.layout
&&
2538 st
->ss
->external
== 0) {
2539 /* use SET_ARRAY_INFO but only if reshape hasn't started */
2540 array
.raid_disks
= reshape
->after
.data_disks
+ reshape
->parity
;
2542 ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
2545 pr_err("Cannot set device shape for %s: %s\n",
2546 devname
, strerror(errno
));
2549 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2550 cont_err("Bitmap must be removed before"
2551 " shape can be changed\n");
2555 } else if (!restart
) {
2556 /* set them all just in case some old 'new_*' value
2557 * persists from some earlier problem.
2560 if (sysfs_set_num(sra
, NULL
, "chunk_size", info
->new_chunk
) < 0)
2562 if (!err
&& sysfs_set_num(sra
, NULL
, "layout",
2563 reshape
->after
.layout
) < 0)
2565 if (!err
&& subarray_set_num(container
, sra
, "raid_disks",
2566 reshape
->after
.data_disks
+
2567 reshape
->parity
) < 0)
2570 pr_err("Cannot set device shape for %s\n",
2574 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2575 cont_err("Bitmap must be removed before"
2576 " shape can be changed\n");
2585 static int reshape_array(char *container
, int fd
, char *devname
,
2586 struct supertype
*st
, struct mdinfo
*info
,
2587 int force
, struct mddev_dev
*devlist
,
2588 unsigned long long data_offset
,
2589 char *backup_file
, int verbose
, int forked
,
2590 int restart
, int freeze_reshape
)
2592 struct reshape reshape
;
2595 int orig_level
= UnSet
;
2599 struct mdu_array_info_s array
;
2602 struct mddev_dev
*dv
;
2606 unsigned long long *offsets
= NULL
;
2610 unsigned long blocks
;
2611 unsigned long long array_size
;
2613 struct mdinfo
*sra
= NULL
;
2615 /* when reshaping a RAID0, the component_size might be zero.
2616 * So try to fix that up.
2618 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) != 0) {
2619 dprintf("Cannot get array information.\n");
2622 if (array
.level
== 0 && info
->component_size
== 0) {
2623 get_dev_size(fd
, NULL
, &array_size
);
2624 info
->component_size
= array_size
/ array
.raid_disks
;
2627 if (array
.level
== 10)
2628 /* Need space_after info */
2629 get_space_after(fd
, st
, info
);
2631 if (info
->reshape_active
) {
2632 int new_level
= info
->new_level
;
2633 info
->new_level
= UnSet
;
2634 if (info
->delta_disks
> 0)
2635 info
->array
.raid_disks
-= info
->delta_disks
;
2636 msg
= analyse_change(info
, &reshape
);
2637 info
->new_level
= new_level
;
2638 if (info
->delta_disks
> 0)
2639 info
->array
.raid_disks
+= info
->delta_disks
;
2641 /* Make sure the array isn't read-only */
2642 ioctl(fd
, RESTART_ARRAY_RW
, 0);
2644 msg
= analyse_change(info
, &reshape
);
2646 pr_err("%s\n", msg
);
2650 (reshape
.level
!= info
->array
.level
||
2651 reshape
.before
.layout
!= info
->array
.layout
||
2652 reshape
.before
.data_disks
+ reshape
.parity
2653 != info
->array
.raid_disks
- max(0, info
->delta_disks
))) {
2654 pr_err("reshape info is not in native format -"
2655 " cannot continue.\n");
2659 if (st
->ss
->external
&& restart
&& (info
->reshape_progress
== 0)) {
2660 /* When reshape is restarted from '0', very begin of array
2661 * it is possible that for external metadata reshape and array
2662 * configuration doesn't happen.
2663 * Check if md has the same opinion, and reshape is restarted
2664 * from 0. If so, this is regular reshape start after reshape
2665 * switch in metadata to next array only.
2667 if ((verify_reshape_position(info
, reshape
.level
) >= 0) &&
2668 (info
->reshape_progress
== 0))
2672 /* reshape already started. just skip to monitoring the reshape */
2673 if (reshape
.backup_blocks
== 0)
2675 if (restart
& RESHAPE_NO_BACKUP
)
2679 /* The container is frozen but the array may not be.
2680 * So freeze the array so spares don't get put to the wrong use
2681 * FIXME there should probably be a cleaner separation between
2682 * freeze_array and freeze_container.
2684 sysfs_freeze_array(info
);
2685 /* Check we have enough spares to not be degraded */
2687 for (dv
= devlist
; dv
; dv
=dv
->next
)
2689 spares_needed
= max(reshape
.before
.data_disks
,
2690 reshape
.after
.data_disks
)
2691 + reshape
.parity
- array
.raid_disks
;
2694 info
->new_level
> 1 && info
->array
.level
> 1 &&
2695 spares_needed
> info
->array
.spare_disks
+ added_disks
) {
2696 pr_err("Need %d spare%s to avoid degraded array,"
2697 " and only have %d.\n"
2698 " Use --force to over-ride this check.\n",
2700 spares_needed
== 1 ? "" : "s",
2701 info
->array
.spare_disks
+ added_disks
);
2704 /* Check we have enough spares to not fail */
2705 spares_needed
= max(reshape
.before
.data_disks
,
2706 reshape
.after
.data_disks
)
2708 if ((info
->new_level
> 1 || info
->new_level
== 0) &&
2709 spares_needed
> info
->array
.spare_disks
+added_disks
) {
2710 pr_err("Need %d spare%s to create working array,"
2711 " and only have %d.\n",
2713 spares_needed
== 1 ? "" : "s",
2714 info
->array
.spare_disks
+ added_disks
);
2718 if (reshape
.level
!= array
.level
) {
2719 char *c
= map_num(pers
, reshape
.level
);
2724 err
= sysfs_set_str(info
, NULL
, "level", c
);
2727 pr_err("%s: could not set level to %s\n",
2730 (info
->array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2731 cont_err("Bitmap must be removed"
2732 " before level can be changed\n");
2736 pr_err("level of %s changed to %s\n",
2738 orig_level
= array
.level
;
2739 sysfs_freeze_array(info
);
2741 if (reshape
.level
> 0 && st
->ss
->external
) {
2742 /* make sure mdmon is aware of the new level */
2743 if (mdmon_running(container
))
2744 flush_mdmon(container
);
2746 if (!mdmon_running(container
))
2747 start_mdmon(container
);
2748 ping_monitor(container
);
2749 if (mdmon_running(container
) &&
2750 st
->update_tail
== NULL
)
2751 st
->update_tail
= &st
->updates
;
2754 /* ->reshape_super might have chosen some spares from the
2755 * container that it wants to be part of the new array.
2756 * We can collect them with ->container_content and give
2757 * them to the kernel.
2759 if (st
->ss
->reshape_super
&& st
->ss
->container_content
) {
2760 char *subarray
= strchr(info
->text_version
+1, '/')+1;
2761 struct mdinfo
*info2
=
2762 st
->ss
->container_content(st
, subarray
);
2766 sysfs_init(info2
, fd
, st
->devnm
);
2767 /* When increasing number of devices, we need to set
2768 * new raid_disks before adding these, or they might
2771 if (reshape
.backup_blocks
&&
2772 reshape
.after
.data_disks
> reshape
.before
.data_disks
)
2773 subarray_set_num(container
, info2
, "raid_disks",
2774 reshape
.after
.data_disks
+
2776 for (d
= info2
->devs
; d
; d
= d
->next
) {
2777 if (d
->disk
.state
== 0 &&
2778 d
->disk
.raid_disk
>= 0) {
2779 /* This is a spare that wants to
2780 * be part of the array.
2782 add_disk(fd
, st
, info2
, d
);
2788 /* We might have been given some devices to add to the
2789 * array. Now that the array has been changed to the right
2790 * level and frozen, we can safely add them.
2793 Manage_subdevs(devname
, fd
, devlist
, verbose
,
2797 if (reshape
.backup_blocks
== 0 && data_offset
)
2798 reshape
.backup_blocks
= reshape
.before
.data_disks
* info
->array
.chunk_size
/512;
2799 if (reshape
.backup_blocks
== 0) {
2800 /* No restriping needed, but we might need to impose
2801 * some more changes: layout, raid_disks, chunk_size
2803 /* read current array info */
2804 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) != 0) {
2805 dprintf("Cannot get array information.\n");
2808 /* compare current array info with new values and if
2809 * it is different update them to new */
2810 if (info
->new_layout
!= UnSet
&&
2811 info
->new_layout
!= array
.layout
) {
2812 array
.layout
= info
->new_layout
;
2813 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
2814 pr_err("failed to set new layout\n");
2816 } else if (verbose
>= 0)
2817 printf("layout for %s set to %d\n",
2818 devname
, array
.layout
);
2820 if (info
->delta_disks
!= UnSet
&&
2821 info
->delta_disks
!= 0 &&
2822 array
.raid_disks
!= (info
->array
.raid_disks
+ info
->delta_disks
)) {
2823 array
.raid_disks
+= info
->delta_disks
;
2824 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
2825 pr_err("failed to set raid disks\n");
2827 } else if (verbose
>= 0) {
2828 printf("raid_disks for %s set to %d\n",
2829 devname
, array
.raid_disks
);
2832 if (info
->new_chunk
!= 0 &&
2833 info
->new_chunk
!= array
.chunk_size
) {
2834 if (sysfs_set_num(info
, NULL
,
2835 "chunk_size", info
->new_chunk
) != 0) {
2836 pr_err("failed to set chunk size\n");
2838 } else if (verbose
>= 0)
2839 printf("chunk size for %s set to %d\n",
2840 devname
, array
.chunk_size
);
2847 * There are three possibilities.
2848 * 1/ The array will shrink.
2849 * We need to ensure the reshape will pause before reaching
2850 * the 'critical section'. We also need to fork and wait for
2851 * that to happen. When it does we
2852 * suspend/backup/complete/unfreeze
2854 * 2/ The array will not change size.
2855 * This requires that we keep a backup of a sliding window
2856 * so that we can restore data after a crash. So we need
2857 * to fork and monitor progress.
2858 * In future we will allow the data_offset to change, so
2859 * a sliding backup becomes unnecessary.
2861 * 3/ The array will grow. This is relatively easy.
2862 * However the kernel's restripe routines will cheerfully
2863 * overwrite some early data before it is safe. So we
2864 * need to make a backup of the early parts of the array
2865 * and be ready to restore it if rebuild aborts very early.
2866 * For externally managed metadata, we still need a forked
2867 * child to monitor the reshape and suspend IO over the region
2868 * that is being reshaped.
2870 * We backup data by writing it to one spare, or to a
2871 * file which was given on command line.
2873 * In each case, we first make sure that storage is available
2874 * for the required backup.
2876 * - request the shape change.
2877 * - fork to handle backup etc.
2879 /* Check that we can hold all the data */
2880 get_dev_size(fd
, NULL
, &array_size
);
2881 if (reshape
.new_size
< (array_size
/512)) {
2882 pr_err("this change will reduce the size of the array.\n"
2883 " use --grow --array-size first to truncate array.\n"
2884 " e.g. mdadm --grow %s --array-size %llu\n",
2885 devname
, reshape
.new_size
/2);
2889 if (array
.level
== 10) {
2890 /* Reshaping RAID10 does not require any data backup by
2891 * user-space. Instead it requires that the data_offset
2892 * is changed to avoid the need for backup.
2893 * So this is handled very separately
2896 /* Nothing to do. */
2898 return raid10_reshape(container
, fd
, devname
, st
, info
,
2899 &reshape
, data_offset
,
2902 sra
= sysfs_read(fd
, NULL
,
2903 GET_COMPONENT
|GET_DEVS
|GET_OFFSET
|GET_STATE
|GET_CHUNK
|
2906 pr_err("%s: Cannot get array details from sysfs\n",
2912 switch(set_new_data_offset(sra
, st
, devname
,
2913 reshape
.after
.data_disks
- reshape
.before
.data_disks
,
2915 reshape
.min_offset_change
)) {
2919 /* Updated data_offset, so it's easy now */
2920 update_cache_size(container
, sra
, info
,
2921 min(reshape
.before
.data_disks
,
2922 reshape
.after
.data_disks
),
2923 reshape
.backup_blocks
);
2925 /* Right, everything seems fine. Let's kick things off.
2929 if (impose_reshape(sra
, info
, st
, fd
, restart
,
2930 devname
, container
, &reshape
) < 0)
2932 if (sysfs_set_str(sra
, NULL
, "sync_action", "reshape") < 0) {
2933 pr_err("Failed to initiate reshape!\n");
2938 case 1: /* Couldn't set data_offset, try the old way */
2939 if (data_offset
!= INVALID_SECTORS
) {
2940 pr_err("Cannot update data_offset on this array\n");
2947 /* Decide how many blocks (sectors) for a reshape
2948 * unit. The number we have so far is just a minimum
2950 blocks
= reshape
.backup_blocks
;
2951 if (reshape
.before
.data_disks
==
2952 reshape
.after
.data_disks
) {
2953 /* Make 'blocks' bigger for better throughput, but
2954 * not so big that we reject it below.
2955 * Try for 16 megabytes
2957 while (blocks
* 32 < sra
->component_size
&&
2961 pr_err("Need to backup %luK of critical "
2962 "section..\n", blocks
/2);
2964 if (blocks
>= sra
->component_size
/2) {
2965 pr_err("%s: Something wrong"
2966 " - reshape aborted\n",
2971 /* Now we need to open all these devices so we can read/write.
2973 nrdisks
= max(reshape
.before
.data_disks
,
2974 reshape
.after
.data_disks
) + reshape
.parity
2975 + sra
->array
.spare_disks
;
2976 fdlist
= xcalloc((1+nrdisks
), sizeof(int));
2977 offsets
= xcalloc((1+nrdisks
), sizeof(offsets
[0]));
2979 odisks
= reshape
.before
.data_disks
+ reshape
.parity
;
2980 d
= reshape_prepare_fdlist(devname
, sra
, odisks
,
2981 nrdisks
, blocks
, backup_file
,
2986 if ((st
->ss
->manage_reshape
== NULL
) ||
2987 (st
->ss
->recover_backup
== NULL
)) {
2988 if (backup_file
== NULL
) {
2989 if (reshape
.after
.data_disks
<=
2990 reshape
.before
.data_disks
) {
2991 pr_err("%s: Cannot grow - "
2992 "need backup-file\n", devname
);
2994 } else if (sra
->array
.spare_disks
== 0) {
2995 pr_err("%s: Cannot grow - "
2996 "need a spare or backup-file to backup "
2997 "critical section\n", devname
);
3001 if (!reshape_open_backup_file(backup_file
, fd
, devname
,
3003 fdlist
+d
, offsets
+d
,
3011 update_cache_size(container
, sra
, info
,
3012 min(reshape
.before
.data_disks
, reshape
.after
.data_disks
),
3015 /* Right, everything seems fine. Let's kick things off.
3016 * If only changing raid_disks, use ioctl, else use
3021 if (impose_reshape(sra
, info
, st
, fd
, restart
,
3022 devname
, container
, &reshape
) < 0)
3025 err
= start_reshape(sra
, restart
, reshape
.before
.data_disks
,
3026 reshape
.after
.data_disks
);
3028 pr_err("Cannot %s reshape for %s\n",
3029 restart
? "continue" : "start",
3034 sysfs_set_str(sra
, NULL
, "array_state", "active");
3035 if (freeze_reshape
) {
3039 pr_err("Reshape has to be continued from"
3040 " location %llu when root filesystem has been mounted.\n",
3041 sra
->reshape_progress
);
3045 /* Now we just need to kick off the reshape and watch, while
3046 * handling backups of the data...
3047 * This is all done by a forked background process.
3049 switch(forked
? 0 : fork()) {
3051 pr_err("Cannot run child to monitor reshape: %s\n",
3065 /* If another array on the same devices is busy, the
3066 * reshape will wait for them. This would mean that
3067 * the first section that we suspend will stay suspended
3068 * for a long time. So check on that possibility
3069 * by looking for "DELAYED" in /proc/mdstat, and if found,
3073 struct mdstat_ent
*mds
, *m
;
3075 mds
= mdstat_read(0, 0);
3076 for (m
= mds
; m
; m
= m
->next
)
3077 if (strcmp(m
->devnm
, sra
->sys_name
) == 0) {
3079 m
->percent
== RESYNC_DELAYED
)
3082 /* Haven't started the reshape thread
3089 if (delayed
== 1 && get_linux_version() < 3007000) {
3090 pr_err("Reshape is delayed, but cannot wait carefully with this kernel.\n"
3091 " You might experience problems until other reshapes complete.\n");
3095 sleep(30 - (delayed
-1) * 25);
3099 if (check_env("MDADM_GROW_VERIFY"))
3100 fd
= open(devname
, O_RDONLY
| O_DIRECT
);
3103 mlockall(MCL_FUTURE
);
3105 if (st
->ss
->external
) {
3106 /* metadata handler takes it from here */
3107 done
= st
->ss
->manage_reshape(
3108 fd
, sra
, &reshape
, st
, blocks
,
3110 d
- odisks
, fdlist
+odisks
,
3113 done
= child_monitor(
3114 fd
, sra
, &reshape
, st
, blocks
,
3116 d
- odisks
, fdlist
+odisks
,
3122 if (backup_file
&& done
)
3123 unlink(backup_file
);
3129 if (!st
->ss
->external
&&
3130 !(reshape
.before
.data_disks
!= reshape
.after
.data_disks
3131 && info
->custom_array_size
) &&
3132 info
->new_level
== reshape
.level
&&
3134 /* no need to wait for the reshape to finish as
3135 * there is nothing more to do.
3142 if (st
->ss
->external
) {
3143 /* Re-load the metadata as much could have changed */
3144 int cfd
= open_dev(st
->container_devnm
);
3146 flush_mdmon(container
);
3147 st
->ss
->free_super(st
);
3148 st
->ss
->load_container(st
, cfd
, container
);
3153 /* set new array size if required customer_array_size is used
3156 if (reshape
.before
.data_disks
!=
3157 reshape
.after
.data_disks
&&
3158 info
->custom_array_size
)
3159 set_array_size(st
, info
, info
->text_version
);
3161 if (info
->new_level
!= reshape
.level
) {
3163 c
= map_num(pers
, info
->new_level
);
3165 err
= sysfs_set_str(sra
, NULL
, "level", c
);
3167 pr_err("%s: could not set level "
3168 "to %s\n", devname
, c
);
3170 if (info
->new_level
== 0)
3171 st
->update_tail
= NULL
;
3183 if (orig_level
!= UnSet
&& sra
) {
3184 c
= map_num(pers
, orig_level
);
3185 if (c
&& sysfs_set_str(sra
, NULL
, "level", c
) == 0)
3186 pr_err("aborting level change\n");
3194 /* mdfd handle is passed to be closed in child process (after fork).
3196 int reshape_container(char *container
, char *devname
,
3198 struct supertype
*st
,
3199 struct mdinfo
*info
,
3202 int verbose
, int restart
, int freeze_reshape
)
3204 struct mdinfo
*cc
= NULL
;
3206 char last_devnm
[32] = "";
3208 /* component_size is not meaningful for a container,
3209 * so pass '0' meaning 'no change'
3212 reshape_super(st
, 0, info
->new_level
,
3213 info
->new_layout
, info
->new_chunk
,
3214 info
->array
.raid_disks
, info
->delta_disks
,
3215 backup_file
, devname
, APPLY_METADATA_CHANGES
,
3223 /* ping monitor to be sure that update is on disk
3225 ping_monitor(container
);
3228 case -1: /* error */
3229 perror("Cannot fork to complete reshape\n");
3232 default: /* parent */
3233 if (!freeze_reshape
)
3234 printf(Name
": multi-array reshape continues"
3235 " in background\n");
3242 /* close unused handle in child process
3248 /* For each member array with reshape_active,
3249 * we need to perform the reshape.
3250 * We pick the first array that needs reshaping and
3251 * reshape it. reshape_array() will re-read the metadata
3252 * so the next time through a different array should be
3253 * ready for reshape.
3254 * It is possible that the 'different' array will not
3255 * be assembled yet. In that case we simple exit.
3256 * When it is assembled, the mdadm which assembles it
3257 * will take over the reshape.
3259 struct mdinfo
*content
;
3261 struct mdstat_ent
*mdstat
;
3267 cc
= st
->ss
->container_content(st
, NULL
);
3269 for (content
= cc
; content
; content
= content
->next
) {
3271 if (!content
->reshape_active
)
3274 subarray
= strchr(content
->text_version
+1, '/')+1;
3275 mdstat
= mdstat_by_subdev(subarray
, container
);
3278 if (mdstat
->active
== 0) {
3279 pr_err("Skipping inactive array %s.\n",
3281 free_mdstat(mdstat
);
3290 devid
= devnm2devid(mdstat
->devnm
);
3291 adev
= map_dev(major(devid
), minor(devid
), 0);
3293 adev
= content
->text_version
;
3295 fd
= open_dev(mdstat
->devnm
);
3297 printf(Name
": Device %s cannot be opened for reshape.",
3302 if (strcmp(last_devnm
, mdstat
->devnm
) == 0) {
3303 /* Do not allow for multiple reshape_array() calls for
3305 * It can happen when reshape_array() returns without
3306 * error, when reshape is not finished (wrong reshape
3307 * starting/continuation conditions). Mdmon doesn't
3308 * switch to next array in container and reentry
3309 * conditions for the same array occur.
3310 * This is possibly interim until the behaviour of
3311 * reshape_array is resolved().
3313 printf(Name
": Multiple reshape execution detected for "
3314 "device %s.", adev
);
3318 strcpy(last_devnm
, mdstat
->devnm
);
3320 sysfs_init(content
, fd
, mdstat
->devnm
);
3322 if (mdmon_running(container
))
3323 flush_mdmon(container
);
3325 rv
= reshape_array(container
, fd
, adev
, st
,
3326 content
, force
, NULL
, 0ULL,
3327 backup_file
, verbose
, 1, restart
,
3331 if (freeze_reshape
) {
3340 if (mdmon_running(container
))
3341 flush_mdmon(container
);
3350 * We run a child process in the background which performs the following
3352 * - wait for resync to reach a certain point
3353 * - suspend io to the following section
3354 * - backup that section
3355 * - allow resync to proceed further
3357 * - discard the backup.
3359 * When are combined in slightly different ways in the three cases.
3361 * - suspend/backup/allow/wait/resume/discard
3363 * - allow/wait/suspend/backup/allow/wait/resume/discard
3365 * - wait/resume/discard/suspend/backup/allow
3367 * suspend/backup/allow always come together
3368 * wait/resume/discard do too.
3369 * For the same-size case we have two backups to improve flow.
3373 int progress_reshape(struct mdinfo
*info
, struct reshape
*reshape
,
3374 unsigned long long backup_point
,
3375 unsigned long long wait_point
,
3376 unsigned long long *suspend_point
,
3377 unsigned long long *reshape_completed
)
3379 /* This function is called repeatedly by the reshape manager.
3380 * It determines how much progress can safely be made and allows
3382 * - 'info' identifies the array and particularly records in
3383 * ->reshape_progress the metadata's knowledge of progress
3384 * This is a sector offset from the start of the array
3385 * of the next array block to be relocated. This number
3386 * may increase from 0 or decrease from array_size, depending
3387 * on the type of reshape that is happening.
3388 * Note that in contrast, 'sync_completed' is a block count of the
3389 * reshape so far. It gives the distance between the start point
3390 * (head or tail of device) and the next place that data will be
3391 * written. It always increases.
3392 * - 'reshape' is the structure created by analyse_change
3393 * - 'backup_point' shows how much the metadata manager has backed-up
3394 * data. For reshapes with increasing progress, it is the next address
3395 * to be backed up, previous addresses have been backed-up. For
3396 * decreasing progress, it is the earliest address that has been
3397 * backed up - later address are also backed up.
3398 * So addresses between reshape_progress and backup_point are
3399 * backed up providing those are in the 'correct' order.
3400 * - 'wait_point' is an array address. When reshape_completed
3401 * passes this point, progress_reshape should return. It might
3402 * return earlier if it determines that ->reshape_progress needs
3403 * to be updated or further backup is needed.
3404 * - suspend_point is maintained by progress_reshape and the caller
3405 * should not touch it except to initialise to zero.
3406 * It is an array address and it only increases in 2.6.37 and earlier.
3407 * This makes it difficult to handle reducing reshapes with
3408 * external metadata.
3409 * However: it is similar to backup_point in that it records the
3410 * other end of a suspended region from reshape_progress.
3411 * it is moved to extend the region that is safe to backup and/or
3413 * - reshape_completed is read from sysfs and returned. The caller
3414 * should copy this into ->reshape_progress when it has reason to
3415 * believe that the metadata knows this, and any backup outside this
3419 * 1 if more data from backup_point - but only as far as suspend_point,
3420 * should be backed up
3421 * 0 if things are progressing smoothly
3422 * -1 if the reshape is finished because it is all done,
3423 * -2 if the reshape is finished due to an error.
3426 int advancing
= (reshape
->after
.data_disks
3427 >= reshape
->before
.data_disks
);
3428 unsigned long long need_backup
; /* All data between start of array and
3429 * here will at some point need to
3432 unsigned long long read_offset
, write_offset
;
3433 unsigned long long write_range
;
3434 unsigned long long max_progress
, target
, completed
;
3435 unsigned long long array_size
= (info
->component_size
3436 * reshape
->before
.data_disks
);
3440 /* First, we unsuspend any region that is now known to be safe.
3441 * If suspend_point is on the 'wrong' side of reshape_progress, then
3442 * we don't have or need suspension at the moment. This is true for
3443 * native metadata when we don't need to back-up.
3446 if (info
->reshape_progress
<= *suspend_point
)
3447 sysfs_set_num(info
, NULL
, "suspend_lo",
3448 info
->reshape_progress
);
3450 /* Note: this won't work in 2.6.37 and before.
3451 * Something somewhere should make sure we don't need it!
3453 if (info
->reshape_progress
>= *suspend_point
)
3454 sysfs_set_num(info
, NULL
, "suspend_hi",
3455 info
->reshape_progress
);
3458 /* Now work out how far it is safe to progress.
3459 * If the read_offset for ->reshape_progress is less than
3460 * 'blocks' beyond the write_offset, we can only progress as far
3462 * Otherwise we can progress until the write_offset for the new location
3463 * reaches (within 'blocks' of) the read_offset at the current location.
3464 * However that region must be suspended unless we are using native
3466 * If we need to suspend more, we limit it to 128M per device, which is
3467 * rather arbitrary and should be some time-based calculation.
3469 read_offset
= info
->reshape_progress
/ reshape
->before
.data_disks
;
3470 write_offset
= info
->reshape_progress
/ reshape
->after
.data_disks
;
3471 write_range
= info
->new_chunk
/512;
3472 if (reshape
->before
.data_disks
== reshape
->after
.data_disks
)
3473 need_backup
= array_size
;
3475 need_backup
= reshape
->backup_blocks
;
3477 if (read_offset
< write_offset
+ write_range
)
3478 max_progress
= backup_point
;
3482 reshape
->after
.data_disks
;
3484 if (read_offset
> write_offset
- write_range
)
3485 /* Can only progress as far as has been backed up,
3486 * which must be suspended */
3487 max_progress
= backup_point
;
3488 else if (info
->reshape_progress
<= need_backup
)
3489 max_progress
= backup_point
;
3491 if (info
->array
.major_version
>= 0)
3492 /* Can progress until backup is needed */
3493 max_progress
= need_backup
;
3495 /* Can progress until metadata update is required */
3498 reshape
->after
.data_disks
;
3499 /* but data must be suspended */
3500 if (max_progress
< *suspend_point
)
3501 max_progress
= *suspend_point
;
3506 /* We know it is safe to progress to 'max_progress' providing
3507 * it is suspended or we are using native metadata.
3508 * Consider extending suspend_point 128M per device if it
3509 * is less than 64M per device beyond reshape_progress.
3510 * But always do a multiple of 'blocks'
3511 * FIXME this is too big - it takes to long to complete
3514 target
= 64*1024*2 * min(reshape
->before
.data_disks
,
3515 reshape
->after
.data_disks
);
3516 target
/= reshape
->backup_blocks
;
3519 target
*= reshape
->backup_blocks
;
3521 /* For externally managed metadata we always need to suspend IO to
3522 * the area being reshaped so we regularly push suspend_point forward.
3523 * For native metadata we only need the suspend if we are going to do
3527 if ((need_backup
> info
->reshape_progress
3528 || info
->array
.major_version
< 0) &&
3529 *suspend_point
< info
->reshape_progress
+ target
) {
3530 if (need_backup
< *suspend_point
+ 2 * target
)
3531 *suspend_point
= need_backup
;
3532 else if (*suspend_point
+ 2 * target
< array_size
)
3533 *suspend_point
+= 2 * target
;
3535 *suspend_point
= array_size
;
3536 sysfs_set_num(info
, NULL
, "suspend_hi", *suspend_point
);
3537 if (max_progress
> *suspend_point
)
3538 max_progress
= *suspend_point
;
3541 if (info
->array
.major_version
>= 0) {
3542 /* Only need to suspend when about to backup */
3543 if (info
->reshape_progress
< need_backup
* 2 &&
3544 *suspend_point
> 0) {
3546 sysfs_set_num(info
, NULL
, "suspend_lo", 0);
3547 sysfs_set_num(info
, NULL
, "suspend_hi", need_backup
);
3550 /* Need to suspend continually */
3551 if (info
->reshape_progress
< *suspend_point
)
3552 *suspend_point
= info
->reshape_progress
;
3553 if (*suspend_point
+ target
< info
->reshape_progress
)
3554 /* No need to move suspend region yet */;
3556 if (*suspend_point
>= 2 * target
)
3557 *suspend_point
-= 2 * target
;
3560 sysfs_set_num(info
, NULL
, "suspend_lo",
3563 if (max_progress
< *suspend_point
)
3564 max_progress
= *suspend_point
;
3568 /* now set sync_max to allow that progress. sync_max, like
3569 * sync_completed is a count of sectors written per device, so
3570 * we find the difference between max_progress and the start point,
3571 * and divide that by after.data_disks to get a sync_max
3573 * At the same time we convert wait_point to a similar number
3574 * for comparing against sync_completed.
3576 /* scale down max_progress to per_disk */
3577 max_progress
/= reshape
->after
.data_disks
;
3578 /* Round to chunk size as some kernels give an erroneously high number */
3579 max_progress
/= info
->new_chunk
/512;
3580 max_progress
*= info
->new_chunk
/512;
3581 /* And round to old chunk size as the kernel wants that */
3582 max_progress
/= info
->array
.chunk_size
/512;
3583 max_progress
*= info
->array
.chunk_size
/512;
3584 /* Limit progress to the whole device */
3585 if (max_progress
> info
->component_size
)
3586 max_progress
= info
->component_size
;
3587 wait_point
/= reshape
->after
.data_disks
;
3589 /* switch from 'device offset' to 'processed block count' */
3590 max_progress
= info
->component_size
- max_progress
;
3591 wait_point
= info
->component_size
- wait_point
;
3594 sysfs_set_num(info
, NULL
, "sync_max", max_progress
);
3596 /* Now wait. If we have already reached the point that we were
3597 * asked to wait to, don't wait at all, else wait for any change.
3598 * We need to select on 'sync_completed' as that is the place that
3599 * notifications happen, but we are really interested in
3600 * 'reshape_position'
3602 fd
= sysfs_get_fd(info
, NULL
, "sync_completed");
3604 goto check_progress
;
3606 if (sysfs_fd_get_ll(fd
, &completed
) < 0)
3607 goto check_progress
;
3609 while (completed
< max_progress
&& completed
< wait_point
) {
3610 /* Check that sync_action is still 'reshape' to avoid
3611 * waiting forever on a dead array
3615 if (sysfs_get_str(info
, NULL
, "sync_action",
3617 strncmp(action
, "reshape", 7) != 0)
3619 /* Some kernels reset 'sync_completed' to zero
3620 * before setting 'sync_action' to 'idle'.
3621 * So we need these extra tests.
3623 if (completed
== 0 && advancing
3624 && info
->reshape_progress
> 0)
3626 if (completed
== 0 && !advancing
3627 && info
->reshape_progress
< (info
->component_size
3628 * reshape
->after
.data_disks
))
3632 select(fd
+1, NULL
, NULL
, &rfds
, NULL
);
3633 if (sysfs_fd_get_ll(fd
, &completed
) < 0)
3634 goto check_progress
;
3636 /* Some kernels reset 'sync_completed' to zero,
3637 * we need to have real point we are in md
3640 completed
= max_progress
;
3642 /* some kernels can give an incorrectly high 'completed' number */
3643 completed
/= (info
->new_chunk
/512);
3644 completed
*= (info
->new_chunk
/512);
3645 /* Convert 'completed' back in to a 'progress' number */
3646 completed
*= reshape
->after
.data_disks
;
3648 completed
= info
->component_size
* reshape
->after
.data_disks
3651 *reshape_completed
= completed
;
3655 /* We return the need_backup flag. Caller will decide
3656 * how much - a multiple of ->backup_blocks up to *suspend_point
3659 return need_backup
> info
->reshape_progress
;
3661 return need_backup
>= info
->reshape_progress
;
3664 /* if we couldn't read a number from sync_completed, then
3665 * either the reshape did complete, or it aborted.
3666 * We can tell which by checking for 'none' in reshape_position.
3667 * If it did abort, then it might immediately restart if it
3668 * it was just a device failure that leaves us degraded but
3672 if (sysfs_get_str(info
, NULL
, "reshape_position", buf
, sizeof(buf
)) < 0
3673 || strncmp(buf
, "none", 4) != 0) {
3674 /* The abort might only be temporary. Wait up to 10
3675 * seconds for fd to contain a valid number again.
3681 while (fd
>= 0 && rv
< 0 && tv
.tv_sec
> 0) {
3685 if (select(fd
+1, NULL
, NULL
, &rfds
, &tv
) != 1)
3687 switch (sysfs_fd_get_ll(fd
, &completed
)) {
3689 /* all good again */
3692 case -2: /* read error - abort */
3699 return rv
; /* abort */
3701 /* Maybe racing with array shutdown - check state */
3704 if (sysfs_get_str(info
, NULL
, "array_state", buf
, sizeof(buf
)) < 0
3705 || strncmp(buf
, "inactive", 8) == 0
3706 || strncmp(buf
, "clear",5) == 0)
3707 return -2; /* abort */
3708 return -1; /* complete */
3712 /* FIXME return status is never checked */
3713 static int grow_backup(struct mdinfo
*sra
,
3714 unsigned long long offset
, /* per device */
3715 unsigned long stripes
, /* per device, in old chunks */
3716 int *sources
, unsigned long long *offsets
,
3717 int disks
, int chunk
, int level
, int layout
,
3718 int dests
, int *destfd
, unsigned long long *destoffsets
,
3719 int part
, int *degraded
,
3722 /* Backup 'blocks' sectors at 'offset' on each device of the array,
3723 * to storage 'destfd' (offset 'destoffsets'), after first
3724 * suspending IO. Then allow resync to continue
3725 * over the suspended section.
3726 * Use part 'part' of the backup-super-block.
3731 unsigned long long ll
;
3733 //printf("offset %llu\n", offset);
3739 /* Check that array hasn't become degraded, else we might backup the wrong data */
3740 if (sysfs_get_ll(sra
, NULL
, "degraded", &ll
) < 0)
3741 return -1; /* FIXME this error is ignored */
3742 new_degraded
= (int)ll
;
3743 if (new_degraded
!= *degraded
) {
3744 /* check each device to ensure it is still working */
3746 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
3747 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
3749 if (sd
->disk
.state
& (1<<MD_DISK_SYNC
)) {
3751 if (sysfs_get_str(sra
, sd
, "state", sbuf
, 20) < 0 ||
3752 strstr(sbuf
, "faulty") ||
3753 strstr(sbuf
, "in_sync") == NULL
) {
3754 /* this device is dead */
3755 sd
->disk
.state
= (1<<MD_DISK_FAULTY
);
3756 if (sd
->disk
.raid_disk
>= 0 &&
3757 sources
[sd
->disk
.raid_disk
] >= 0) {
3758 close(sources
[sd
->disk
.raid_disk
]);
3759 sources
[sd
->disk
.raid_disk
] = -1;
3764 *degraded
= new_degraded
;
3767 bsb
.arraystart2
= __cpu_to_le64(offset
* odata
);
3768 bsb
.length2
= __cpu_to_le64(stripes
* (chunk
/512) * odata
);
3770 bsb
.arraystart
= __cpu_to_le64(offset
* odata
);
3771 bsb
.length
= __cpu_to_le64(stripes
* (chunk
/512) * odata
);
3774 bsb
.magic
[15] = '2';
3775 for (i
= 0; i
< dests
; i
++)
3777 lseek64(destfd
[i
], destoffsets
[i
] + __le64_to_cpu(bsb
.devstart2
)*512, 0);
3779 lseek64(destfd
[i
], destoffsets
[i
], 0);
3781 rv
= save_stripes(sources
, offsets
,
3782 disks
, chunk
, level
, layout
,
3784 offset
*512*odata
, stripes
* chunk
* odata
,
3789 bsb
.mtime
= __cpu_to_le64(time(0));
3790 for (i
= 0; i
< dests
; i
++) {
3791 bsb
.devstart
= __cpu_to_le64(destoffsets
[i
]/512);
3793 bsb
.sb_csum
= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
));
3794 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0)
3795 bsb
.sb_csum2
= bsb_csum((char*)&bsb
,
3796 ((char*)&bsb
.sb_csum2
)-((char*)&bsb
));
3799 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
] - 4096, 0)
3800 != destoffsets
[i
] - 4096)
3802 if (write(destfd
[i
], &bsb
, 512) != 512)
3804 if (destoffsets
[i
] > 4096) {
3805 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
]+stripes
*chunk
*odata
, 0) !=
3806 destoffsets
[i
]+stripes
*chunk
*odata
)
3808 if (write(destfd
[i
], &bsb
, 512) != 512)
3818 /* in 2.6.30, the value reported by sync_completed can be
3819 * less that it should be by one stripe.
3820 * This only happens when reshape hits sync_max and pauses.
3821 * So allow wait_backup to either extent sync_max further
3822 * than strictly necessary, or return before the
3823 * sync has got quite as far as we would really like.
3824 * This is what 'blocks2' is for.
3825 * The various caller give appropriate values so that
3828 /* FIXME return value is often ignored */
3829 static int forget_backup(int dests
, int *destfd
,
3830 unsigned long long *destoffsets
,
3834 * Erase backup 'part' (which is 0 or 1)
3840 bsb
.arraystart2
= __cpu_to_le64(0);
3841 bsb
.length2
= __cpu_to_le64(0);
3843 bsb
.arraystart
= __cpu_to_le64(0);
3844 bsb
.length
= __cpu_to_le64(0);
3846 bsb
.mtime
= __cpu_to_le64(time(0));
3848 for (i
= 0; i
< dests
; i
++) {
3849 bsb
.devstart
= __cpu_to_le64(destoffsets
[i
]/512);
3850 bsb
.sb_csum
= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
));
3851 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0)
3852 bsb
.sb_csum2
= bsb_csum((char*)&bsb
,
3853 ((char*)&bsb
.sb_csum2
)-((char*)&bsb
));
3854 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
]-4096, 0) !=
3855 destoffsets
[i
]-4096)
3858 write(destfd
[i
], &bsb
, 512) != 512)
3865 static void fail(char *msg
)
3868 rv
= (write(2, msg
, strlen(msg
)) != (int)strlen(msg
));
3869 rv
|= (write(2, "\n", 1) != 1);
3873 static char *abuf
, *bbuf
;
3874 static unsigned long long abuflen
;
3875 static void validate(int afd
, int bfd
, unsigned long long offset
)
3877 /* check that the data in the backup against the array.
3878 * This is only used for regression testing and should not
3879 * be used while the array is active
3883 lseek64(bfd
, offset
- 4096, 0);
3884 if (read(bfd
, &bsb2
, 512) != 512)
3885 fail("cannot read bsb");
3886 if (bsb2
.sb_csum
!= bsb_csum((char*)&bsb2
,
3887 ((char*)&bsb2
.sb_csum
)-((char*)&bsb2
)))
3888 fail("first csum bad");
3889 if (memcmp(bsb2
.magic
, "md_backup_data", 14) != 0)
3890 fail("magic is bad");
3891 if (memcmp(bsb2
.magic
, "md_backup_data-2", 16) == 0 &&
3892 bsb2
.sb_csum2
!= bsb_csum((char*)&bsb2
,
3893 ((char*)&bsb2
.sb_csum2
)-((char*)&bsb2
)))
3894 fail("second csum bad");
3896 if (__le64_to_cpu(bsb2
.devstart
)*512 != offset
)
3897 fail("devstart is wrong");
3900 unsigned long long len
= __le64_to_cpu(bsb2
.length
)*512;
3902 if (abuflen
< len
) {
3906 if (posix_memalign((void**)&abuf
, 4096, abuflen
) ||
3907 posix_memalign((void**)&bbuf
, 4096, abuflen
)) {
3909 /* just stop validating on mem-alloc failure */
3914 lseek64(bfd
, offset
, 0);
3915 if ((unsigned long long)read(bfd
, bbuf
, len
) != len
) {
3916 //printf("len %llu\n", len);
3917 fail("read first backup failed");
3919 lseek64(afd
, __le64_to_cpu(bsb2
.arraystart
)*512, 0);
3920 if ((unsigned long long)read(afd
, abuf
, len
) != len
)
3921 fail("read first from array failed");
3922 if (memcmp(bbuf
, abuf
, len
) != 0) {
3925 printf("offset=%llu len=%llu\n",
3926 (unsigned long long)__le64_to_cpu(bsb2
.arraystart
)*512, len
);
3927 for (i
=0; i
<len
; i
++)
3928 if (bbuf
[i
] != abuf
[i
]) {
3929 printf("first diff byte %d\n", i
);
3933 fail("data1 compare failed");
3937 unsigned long long len
= __le64_to_cpu(bsb2
.length2
)*512;
3939 if (abuflen
< len
) {
3943 abuf
= xmalloc(abuflen
);
3944 bbuf
= xmalloc(abuflen
);
3947 lseek64(bfd
, offset
+__le64_to_cpu(bsb2
.devstart2
)*512, 0);
3948 if ((unsigned long long)read(bfd
, bbuf
, len
) != len
)
3949 fail("read second backup failed");
3950 lseek64(afd
, __le64_to_cpu(bsb2
.arraystart2
)*512, 0);
3951 if ((unsigned long long)read(afd
, abuf
, len
) != len
)
3952 fail("read second from array failed");
3953 if (memcmp(bbuf
, abuf
, len
) != 0)
3954 fail("data2 compare failed");
3958 int child_monitor(int afd
, struct mdinfo
*sra
, struct reshape
*reshape
,
3959 struct supertype
*st
, unsigned long blocks
,
3960 int *fds
, unsigned long long *offsets
,
3961 int dests
, int *destfd
, unsigned long long *destoffsets
)
3963 /* Monitor a reshape where backup is being performed using
3964 * 'native' mechanism - either to a backup file, or
3965 * to some space in a spare.
3969 unsigned long long speed
;
3970 unsigned long long suspend_point
, array_size
;
3971 unsigned long long backup_point
, wait_point
;
3972 unsigned long long reshape_completed
;
3974 int increasing
= reshape
->after
.data_disks
>= reshape
->before
.data_disks
;
3975 int part
= 0; /* The next part of the backup area to fill. It may already
3976 * be full, so we need to check */
3977 int level
= reshape
->level
;
3978 int layout
= reshape
->before
.layout
;
3979 int data
= reshape
->before
.data_disks
;
3980 int disks
= reshape
->before
.data_disks
+ reshape
->parity
;
3981 int chunk
= sra
->array
.chunk_size
;
3983 unsigned long stripes
;
3986 /* set up the backup-super-block. This requires the
3987 * uuid from the array.
3989 /* Find a superblock */
3990 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
3994 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
3996 dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 1);
3997 devfd
= dev_open(dn
, O_RDONLY
);
4000 ok
= st
->ss
->load_super(st
, devfd
, NULL
);
4006 pr_err("Cannot find a superblock\n");
4010 memset(&bsb
, 0, 512);
4011 memcpy(bsb
.magic
, "md_backup_data-1", 16);
4012 st
->ss
->uuid_from_super(st
, uuid
);
4013 memcpy(bsb
.set_uuid
, uuid
, 16);
4014 bsb
.mtime
= __cpu_to_le64(time(0));
4015 bsb
.devstart2
= blocks
;
4017 stripes
= blocks
/ (sra
->array
.chunk_size
/512) /
4018 reshape
->before
.data_disks
;
4020 if (posix_memalign((void**)&buf
, 4096, disks
* chunk
))
4021 /* Don't start the 'reshape' */
4023 if (reshape
->before
.data_disks
== reshape
->after
.data_disks
) {
4024 sysfs_get_ll(sra
, NULL
, "sync_speed_min", &speed
);
4025 sysfs_set_num(sra
, NULL
, "sync_speed_min", 200000);
4029 array_size
= sra
->component_size
* reshape
->after
.data_disks
;
4030 backup_point
= sra
->reshape_progress
;
4033 array_size
= sra
->component_size
* reshape
->before
.data_disks
;
4034 backup_point
= reshape
->backup_blocks
;
4035 suspend_point
= array_size
;
4041 /* Want to return as soon the oldest backup slot can
4042 * be released as that allows us to start backing up
4043 * some more, providing suspend_point has been
4044 * advanced, which it should have.
4047 wait_point
= array_size
;
4048 if (part
== 0 && __le64_to_cpu(bsb
.length
) > 0)
4049 wait_point
= (__le64_to_cpu(bsb
.arraystart
) +
4050 __le64_to_cpu(bsb
.length
));
4051 if (part
== 1 && __le64_to_cpu(bsb
.length2
) > 0)
4052 wait_point
= (__le64_to_cpu(bsb
.arraystart2
) +
4053 __le64_to_cpu(bsb
.length2
));
4056 if (part
== 0 && __le64_to_cpu(bsb
.length
) > 0)
4057 wait_point
= __le64_to_cpu(bsb
.arraystart
);
4058 if (part
== 1 && __le64_to_cpu(bsb
.length2
) > 0)
4059 wait_point
= __le64_to_cpu(bsb
.arraystart2
);
4062 rv
= progress_reshape(sra
, reshape
,
4063 backup_point
, wait_point
,
4064 &suspend_point
, &reshape_completed
);
4065 /* external metadata would need to ping_monitor here */
4066 sra
->reshape_progress
= reshape_completed
;
4068 /* Clear any backup region that is before 'here' */
4070 if (__le64_to_cpu(bsb
.length
) > 0 &&
4071 reshape_completed
>= (__le64_to_cpu(bsb
.arraystart
) +
4072 __le64_to_cpu(bsb
.length
)))
4073 forget_backup(dests
, destfd
,
4075 if (__le64_to_cpu(bsb
.length2
) > 0 &&
4076 reshape_completed
>= (__le64_to_cpu(bsb
.arraystart2
) +
4077 __le64_to_cpu(bsb
.length2
)))
4078 forget_backup(dests
, destfd
,
4081 if (__le64_to_cpu(bsb
.length
) > 0 &&
4082 reshape_completed
<= (__le64_to_cpu(bsb
.arraystart
)))
4083 forget_backup(dests
, destfd
,
4085 if (__le64_to_cpu(bsb
.length2
) > 0 &&
4086 reshape_completed
<= (__le64_to_cpu(bsb
.arraystart2
)))
4087 forget_backup(dests
, destfd
,
4096 if (rv
== 0 && increasing
&& !st
->ss
->external
) {
4097 /* No longer need to monitor this reshape */
4103 unsigned long long offset
;
4104 unsigned long actual_stripes
;
4105 /* Need to backup some data.
4106 * If 'part' is not used and the desired
4107 * backup size is suspended, do a backup,
4108 * then consider the next part.
4110 /* Check that 'part' is unused */
4111 if (part
== 0 && __le64_to_cpu(bsb
.length
) != 0)
4113 if (part
== 1 && __le64_to_cpu(bsb
.length2
) != 0)
4116 offset
= backup_point
/ data
;
4117 actual_stripes
= stripes
;
4119 if (offset
+ actual_stripes
* (chunk
/512) >
4120 sra
->component_size
)
4121 actual_stripes
= ((sra
->component_size
- offset
)
4123 if (offset
+ actual_stripes
* (chunk
/512) >
4127 if (offset
< actual_stripes
* (chunk
/512))
4128 actual_stripes
= offset
/ (chunk
/512);
4129 offset
-= actual_stripes
* (chunk
/512);
4130 if (offset
< suspend_point
/data
)
4133 if (actual_stripes
== 0)
4135 grow_backup(sra
, offset
, actual_stripes
,
4137 disks
, chunk
, level
, layout
,
4138 dests
, destfd
, destoffsets
,
4139 part
, °raded
, buf
);
4140 validate(afd
, destfd
[0], destoffsets
[0]);
4141 /* record where 'part' is up to */
4144 backup_point
+= actual_stripes
* (chunk
/512) * data
;
4146 backup_point
-= actual_stripes
* (chunk
/512) * data
;
4150 /* FIXME maybe call progress_reshape one more time instead */
4151 abort_reshape(sra
); /* remove any remaining suspension */
4152 if (reshape
->before
.data_disks
== reshape
->after
.data_disks
)
4153 sysfs_set_num(sra
, NULL
, "sync_speed_min", speed
);
4159 * If any spare contains md_back_data-1 which is recent wrt mtime,
4160 * write that data into the array and update the super blocks with
4161 * the new reshape_progress
4163 int Grow_restart(struct supertype
*st
, struct mdinfo
*info
, int *fdlist
, int cnt
,
4164 char *backup_file
, int verbose
)
4168 unsigned long long *offsets
;
4169 unsigned long long nstripe
, ostripe
;
4172 odata
= info
->array
.raid_disks
- info
->delta_disks
- 1;
4173 if (info
->array
.level
== 6) odata
--; /* number of data disks */
4174 ndata
= info
->array
.raid_disks
- 1;
4175 if (info
->new_level
== 6) ndata
--;
4177 old_disks
= info
->array
.raid_disks
- info
->delta_disks
;
4179 if (info
->delta_disks
<= 0)
4180 /* Didn't grow, so the backup file must have
4184 for (i
=old_disks
-(backup_file
?1:0); i
<cnt
; i
++) {
4185 struct mdinfo dinfo
;
4188 char *devname
, namebuf
[20];
4189 unsigned long long lo
, hi
;
4191 /* This was a spare and may have some saved data on it.
4192 * Load the superblock, find and load the
4193 * backup_super_block.
4194 * If either fail, go on to next device.
4195 * If the backup contains no new info, just return
4196 * else restore data and update all superblocks
4198 if (i
== old_disks
-1) {
4199 fd
= open(backup_file
, O_RDONLY
);
4201 pr_err("backup file %s inaccessible: %s\n",
4202 backup_file
, strerror(errno
));
4205 devname
= backup_file
;
4210 if (st
->ss
->load_super(st
, fd
, NULL
))
4213 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
4214 st
->ss
->free_super(st
);
4217 (dinfo
.data_offset
+ dinfo
.component_size
- 8) <<9,
4219 pr_err("Cannot seek on device %d\n", i
);
4220 continue; /* Cannot seek */
4222 sprintf(namebuf
, "device-%d", i
);
4225 if (read(fd
, &bsb
, sizeof(bsb
)) != sizeof(bsb
)) {
4227 pr_err("Cannot read from %s\n", devname
);
4228 continue; /* Cannot read */
4230 if (memcmp(bsb
.magic
, "md_backup_data-1", 16) != 0 &&
4231 memcmp(bsb
.magic
, "md_backup_data-2", 16) != 0) {
4233 pr_err("No backup metadata on %s\n", devname
);
4236 if (bsb
.sb_csum
!= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
))) {
4238 pr_err("Bad backup-metadata checksum on %s\n", devname
);
4239 continue; /* bad checksum */
4241 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0 &&
4242 bsb
.sb_csum2
!= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum2
)-((char*)&bsb
))) {
4244 pr_err("Bad backup-metadata checksum2 on %s\n", devname
);
4245 continue; /* Bad second checksum */
4247 if (memcmp(bsb
.set_uuid
,info
->uuid
, 16) != 0) {
4249 pr_err("Wrong uuid on backup-metadata on %s\n", devname
);
4250 continue; /* Wrong uuid */
4253 /* array utime and backup-mtime should be updated at much the same time, but it seems that
4254 * sometimes they aren't... So allow considerable flexability in matching, and allow
4255 * this test to be overridden by an environment variable.
4257 if (info
->array
.utime
> (int)__le64_to_cpu(bsb
.mtime
) + 2*60*60 ||
4258 info
->array
.utime
< (int)__le64_to_cpu(bsb
.mtime
) - 10*60) {
4259 if (check_env("MDADM_GROW_ALLOW_OLD")) {
4260 pr_err("accepting backup with timestamp %lu "
4261 "for array with timestamp %lu\n",
4262 (unsigned long)__le64_to_cpu(bsb
.mtime
),
4263 (unsigned long)info
->array
.utime
);
4265 pr_err("too-old timestamp on backup-metadata on %s\n", devname
);
4266 pr_err("If you think it is should be safe, try 'export MDADM_GROW_ALLOW_OLD=1'\n");
4267 continue; /* time stamp is too bad */
4271 if (bsb
.magic
[15] == '1') {
4272 if (bsb
.length
== 0)
4274 if (info
->delta_disks
>= 0) {
4275 /* reshape_progress is increasing */
4276 if (__le64_to_cpu(bsb
.arraystart
)
4277 + __le64_to_cpu(bsb
.length
)
4278 < info
->reshape_progress
) {
4281 pr_err("backup-metadata found on %s but is not needed\n", devname
);
4282 continue; /* No new data here */
4285 /* reshape_progress is decreasing */
4286 if (__le64_to_cpu(bsb
.arraystart
) >=
4287 info
->reshape_progress
)
4288 goto nonew
; /* No new data here */
4291 if (bsb
.length
== 0 && bsb
.length2
== 0)
4293 if (info
->delta_disks
>= 0) {
4294 /* reshape_progress is increasing */
4295 if ((__le64_to_cpu(bsb
.arraystart
)
4296 + __le64_to_cpu(bsb
.length
)
4297 < info
->reshape_progress
)
4299 (__le64_to_cpu(bsb
.arraystart2
)
4300 + __le64_to_cpu(bsb
.length2
)
4301 < info
->reshape_progress
))
4302 goto nonew
; /* No new data here */
4304 /* reshape_progress is decreasing */
4305 if (__le64_to_cpu(bsb
.arraystart
) >=
4306 info
->reshape_progress
&&
4307 __le64_to_cpu(bsb
.arraystart2
) >=
4308 info
->reshape_progress
)
4309 goto nonew
; /* No new data here */
4312 if (lseek64(fd
, __le64_to_cpu(bsb
.devstart
)*512, 0)< 0) {
4315 pr_err("Failed to verify secondary backup-metadata block on %s\n",
4317 continue; /* Cannot seek */
4319 /* There should be a duplicate backup superblock 4k before here */
4320 if (lseek64(fd
, -4096, 1) < 0 ||
4321 read(fd
, &bsb2
, sizeof(bsb2
)) != sizeof(bsb2
))
4322 goto second_fail
; /* Cannot find leading superblock */
4323 if (bsb
.magic
[15] == '1')
4324 bsbsize
= offsetof(struct mdp_backup_super
, pad1
);
4326 bsbsize
= offsetof(struct mdp_backup_super
, pad
);
4327 if (memcmp(&bsb2
, &bsb
, bsbsize
) != 0)
4328 goto second_fail
; /* Cannot find leading superblock */
4330 /* Now need the data offsets for all devices. */
4331 offsets
= xmalloc(sizeof(*offsets
)*info
->array
.raid_disks
);
4332 for(j
=0; j
<info
->array
.raid_disks
; j
++) {
4335 if (st
->ss
->load_super(st
, fdlist
[j
], NULL
))
4336 /* FIXME should be this be an error */
4338 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
4339 st
->ss
->free_super(st
);
4340 offsets
[j
] = dinfo
.data_offset
* 512;
4342 printf(Name
": restoring critical section\n");
4344 if (restore_stripes(fdlist
, offsets
,
4345 info
->array
.raid_disks
,
4349 fd
, __le64_to_cpu(bsb
.devstart
)*512,
4350 __le64_to_cpu(bsb
.arraystart
)*512,
4351 __le64_to_cpu(bsb
.length
)*512, NULL
)) {
4352 /* didn't succeed, so giveup */
4354 pr_err("Error restoring backup from %s\n",
4360 if (bsb
.magic
[15] == '2' &&
4361 restore_stripes(fdlist
, offsets
,
4362 info
->array
.raid_disks
,
4366 fd
, __le64_to_cpu(bsb
.devstart
)*512 +
4367 __le64_to_cpu(bsb
.devstart2
)*512,
4368 __le64_to_cpu(bsb
.arraystart2
)*512,
4369 __le64_to_cpu(bsb
.length2
)*512, NULL
)) {
4370 /* didn't succeed, so giveup */
4372 pr_err("Error restoring second backup from %s\n",
4380 /* Ok, so the data is restored. Let's update those superblocks. */
4384 lo
= __le64_to_cpu(bsb
.arraystart
);
4385 hi
= lo
+ __le64_to_cpu(bsb
.length
);
4387 if (bsb
.magic
[15] == '2' && bsb
.length2
) {
4388 unsigned long long lo1
, hi1
;
4389 lo1
= __le64_to_cpu(bsb
.arraystart2
);
4390 hi1
= lo1
+ __le64_to_cpu(bsb
.length2
);
4394 } else if (lo
< lo1
)
4400 (info
->reshape_progress
< lo
||
4401 info
->reshape_progress
> hi
))
4402 /* backup does not affect reshape_progress*/ ;
4403 else if (info
->delta_disks
>= 0) {
4404 info
->reshape_progress
= __le64_to_cpu(bsb
.arraystart
) +
4405 __le64_to_cpu(bsb
.length
);
4406 if (bsb
.magic
[15] == '2') {
4407 unsigned long long p2
= __le64_to_cpu(bsb
.arraystart2
) +
4408 __le64_to_cpu(bsb
.length2
);
4409 if (p2
> info
->reshape_progress
)
4410 info
->reshape_progress
= p2
;
4413 info
->reshape_progress
= __le64_to_cpu(bsb
.arraystart
);
4414 if (bsb
.magic
[15] == '2') {
4415 unsigned long long p2
= __le64_to_cpu(bsb
.arraystart2
);
4416 if (p2
< info
->reshape_progress
)
4417 info
->reshape_progress
= p2
;
4420 for (j
=0; j
<info
->array
.raid_disks
; j
++) {
4423 if (st
->ss
->load_super(st
, fdlist
[j
], NULL
))
4425 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
4426 dinfo
.reshape_progress
= info
->reshape_progress
;
4427 st
->ss
->update_super(st
, &dinfo
,
4428 "_reshape_progress",
4430 st
->ss
->store_super(st
, fdlist
[j
]);
4431 st
->ss
->free_super(st
);
4435 /* Didn't find any backup data, try to see if any
4438 if (info
->delta_disks
< 0) {
4439 /* When shrinking, the critical section is at the end.
4440 * So see if we are before the critical section.
4442 unsigned long long first_block
;
4443 nstripe
= ostripe
= 0;
4445 while (ostripe
>= nstripe
) {
4446 ostripe
+= info
->array
.chunk_size
/ 512;
4447 first_block
= ostripe
* odata
;
4448 nstripe
= first_block
/ ndata
/ (info
->new_chunk
/512) *
4449 (info
->new_chunk
/512);
4452 if (info
->reshape_progress
>= first_block
)
4455 if (info
->delta_disks
> 0) {
4456 /* See if we are beyond the critical section. */
4457 unsigned long long last_block
;
4458 nstripe
= ostripe
= 0;
4460 while (nstripe
>= ostripe
) {
4461 nstripe
+= info
->new_chunk
/ 512;
4462 last_block
= nstripe
* ndata
;
4463 ostripe
= last_block
/ odata
/ (info
->array
.chunk_size
/512) *
4464 (info
->array
.chunk_size
/512);
4467 if (info
->reshape_progress
>= last_block
)
4470 /* needed to recover critical section! */
4472 pr_err("Failed to find backup of critical section\n");
4476 int Grow_continue_command(char *devname
, int fd
,
4477 char *backup_file
, int verbose
)
4480 struct supertype
*st
= NULL
;
4481 struct mdinfo
*content
= NULL
;
4482 struct mdinfo array
;
4483 char *subarray
= NULL
;
4484 struct mdinfo
*cc
= NULL
;
4485 struct mdstat_ent
*mdstat
= NULL
;
4489 dprintf("Grow continue from command line called for %s\n",
4492 st
= super_by_fd(fd
, &subarray
);
4493 if (!st
|| !st
->ss
) {
4494 pr_err("Unable to determine metadata format for %s\n",
4498 dprintf("Grow continue is run for ");
4499 if (st
->ss
->external
== 0) {
4501 dprintf("native array (%s)\n", devname
);
4502 if (ioctl(fd
, GET_ARRAY_INFO
, &array
.array
) < 0) {
4503 pr_err("%s is not an active md array -"
4504 " aborting\n", devname
);
4506 goto Grow_continue_command_exit
;
4509 /* Need to load a superblock.
4510 * FIXME we should really get what we need from
4513 for (d
= 0; d
< MAX_DISKS
; d
++) {
4514 mdu_disk_info_t disk
;
4518 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
4520 if (disk
.major
== 0 && disk
.minor
== 0)
4522 if ((disk
.state
& (1 << MD_DISK_ACTIVE
)) == 0)
4524 dv
= map_dev(disk
.major
, disk
.minor
, 1);
4527 fd2
= dev_open(dv
, O_RDONLY
);
4530 err
= st
->ss
->load_super(st
, fd2
, NULL
);
4536 if (d
== MAX_DISKS
) {
4537 pr_err("Unable to load metadata for %s\n",
4540 goto Grow_continue_command_exit
;
4542 st
->ss
->getinfo_super(st
, content
, NULL
);
4547 dprintf("subarray (%s)\n", subarray
);
4548 container
= st
->container_devnm
;
4549 cfd
= open_dev_excl(st
->container_devnm
);
4551 container
= st
->devnm
;
4553 cfd
= open_dev_excl(st
->devnm
);
4554 dprintf("container (%s)\n", container
);
4558 pr_err("Unable to open container "
4559 "for %s\n", devname
);
4561 goto Grow_continue_command_exit
;
4564 /* find in container array under reshape
4566 ret_val
= st
->ss
->load_container(st
, cfd
, NULL
);
4568 pr_err("Cannot read superblock for %s\n",
4571 goto Grow_continue_command_exit
;
4574 cc
= st
->ss
->container_content(st
, subarray
);
4575 for (content
= cc
; content
; content
= content
->next
) {
4577 int allow_reshape
= 1;
4579 if (content
->reshape_active
== 0)
4581 /* The decision about array or container wide
4582 * reshape is taken in Grow_continue based
4583 * content->reshape_active state, therefore we
4584 * need to check_reshape based on
4585 * reshape_active and subarray name
4587 if (content
->array
.state
& (1<<MD_SB_BLOCK_VOLUME
))
4589 if (content
->reshape_active
== CONTAINER_RESHAPE
&&
4590 (content
->array
.state
4591 & (1<<MD_SB_BLOCK_CONTAINER_RESHAPE
)))
4594 if (!allow_reshape
) {
4595 pr_err("cannot continue reshape of an array"
4596 " in container with unsupported"
4597 " metadata: %s(%s)\n",
4598 devname
, container
);
4600 goto Grow_continue_command_exit
;
4603 array
= strchr(content
->text_version
+1, '/')+1;
4604 mdstat
= mdstat_by_subdev(array
, container
);
4607 if (mdstat
->active
== 0) {
4608 pr_err("Skipping inactive array %s.\n",
4610 free_mdstat(mdstat
);
4617 pr_err("Unable to determine reshaped "
4618 "array for %s\n", devname
);
4620 goto Grow_continue_command_exit
;
4622 fd2
= open_dev(mdstat
->devnm
);
4624 pr_err("cannot open (%s)\n", mdstat
->devnm
);
4626 goto Grow_continue_command_exit
;
4629 sysfs_init(content
, fd2
, mdstat
->devnm
);
4631 /* start mdmon in case it is not running
4633 if (!mdmon_running(container
))
4634 start_mdmon(container
);
4635 ping_monitor(container
);
4637 if (mdmon_running(container
))
4638 st
->update_tail
= &st
->updates
;
4640 pr_err("No mdmon found. "
4641 "Grow cannot continue.\n");
4643 goto Grow_continue_command_exit
;
4647 /* verify that array under reshape is started from
4650 if (verify_reshape_position(content
, content
->array
.level
) < 0) {
4652 goto Grow_continue_command_exit
;
4657 ret_val
= Grow_continue(fd
, st
, content
, backup_file
, 0);
4659 Grow_continue_command_exit
:
4664 st
->ss
->free_super(st
);
4665 free_mdstat(mdstat
);
4672 int Grow_continue(int mdfd
, struct supertype
*st
, struct mdinfo
*info
,
4673 char *backup_file
, int freeze_reshape
)
4677 if (!info
->reshape_active
)
4680 if (st
->ss
->external
) {
4681 int cfd
= open_dev(st
->container_devnm
);
4686 st
->ss
->load_container(st
, cfd
, st
->container_devnm
);
4688 ret_val
= reshape_container(st
->container_devnm
, NULL
, mdfd
,
4689 st
, info
, 0, backup_file
,
4691 1 | info
->reshape_active
,
4694 ret_val
= reshape_array(NULL
, mdfd
, "array", st
, info
, 1,
4695 NULL
, 0ULL, backup_file
, 0, 0,
4696 1 | info
->reshape_active
,