2 * mdadm - manage Linux "md" devices aka RAID arrays.
4 * Copyright (C) 2001-2013 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>
32 #if ! defined(__BIG_ENDIAN) && ! defined(__LITTLE_ENDIAN)
33 #error no endian defined
38 int restore_backup(struct supertype
*st
,
39 struct mdinfo
*content
,
49 int disk_count
= next_spare
+ working_disks
;
50 char *backup_file
= *backup_filep
;
52 dprintf("Called restore_backup()\n");
53 fdlist
= xmalloc(sizeof(int) * disk_count
);
55 enable_fds(next_spare
);
56 for (i
= 0; i
< next_spare
; i
++)
58 for (dev
= content
->devs
; dev
; dev
= dev
->next
) {
64 fd
= dev_open(buf
, O_RDWR
);
66 if (dev
->disk
.raid_disk
>= 0)
67 fdlist
[dev
->disk
.raid_disk
] = fd
;
69 fdlist
[next_spare
++] = fd
;
73 backup_file
= locate_backup(content
->sys_name
);
74 *backup_filep
= backup_file
;
77 if (st
->ss
->external
&& st
->ss
->recover_backup
)
78 err
= st
->ss
->recover_backup(st
, content
);
80 err
= Grow_restart(st
, content
, fdlist
, next_spare
,
81 backup_file
, verbose
> 0);
83 while (next_spare
> 0) {
85 if (fdlist
[next_spare
] >= 0)
86 close(fdlist
[next_spare
]);
90 pr_err("Failed to restore critical section for reshape - sorry.\n");
92 pr_err("Possibly you need to specify a --backup-file\n");
96 dprintf("restore_backup() returns status OK.\n");
100 int Grow_Add_device(char *devname
, int fd
, char *newdev
)
102 /* Add a device to an active array.
103 * Currently, just extend a linear array.
104 * This requires writing a new superblock on the
105 * new device, calling the kernel to add the device,
106 * and if that succeeds, update the superblock on
108 * This means that we need to *find* all other devices.
115 struct supertype
*st
= NULL
;
116 char *subarray
= NULL
;
118 if (ioctl(fd
, GET_ARRAY_INFO
, &info
.array
) < 0) {
119 pr_err("cannot get array info for %s\n", devname
);
123 if (info
.array
.level
!= -1) {
124 pr_err("can only add devices to linear arrays\n");
128 st
= super_by_fd(fd
, &subarray
);
130 pr_err("cannot handle arrays with superblock version %d\n",
131 info
.array
.major_version
);
136 pr_err("Cannot grow linear sub-arrays yet\n");
142 nfd
= open(newdev
, O_RDWR
|O_EXCL
|O_DIRECT
);
144 pr_err("cannot open %s\n", newdev
);
149 if ((stb
.st_mode
& S_IFMT
) != S_IFBLK
) {
150 pr_err("%s is not a block device!\n", newdev
);
155 /* now check out all the devices and make sure we can read the
157 for (d
=0 ; d
< info
.array
.raid_disks
; d
++) {
158 mdu_disk_info_t disk
;
161 st
->ss
->free_super(st
);
164 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0) {
165 pr_err("cannot get device detail for device %d\n",
171 dv
= map_dev(disk
.major
, disk
.minor
, 1);
173 pr_err("cannot find device file for device %d\n",
179 fd2
= dev_open(dv
, O_RDWR
);
181 pr_err("cannot open device file %s\n", dv
);
187 if (st
->ss
->load_super(st
, fd2
, NULL
)) {
188 pr_err("cannot find super block on %s\n", dv
);
196 /* Ok, looks good. Lets update the superblock and write it out to
200 info
.disk
.number
= d
;
201 info
.disk
.major
= major(stb
.st_rdev
);
202 info
.disk
.minor
= minor(stb
.st_rdev
);
203 info
.disk
.raid_disk
= d
;
204 info
.disk
.state
= (1 << MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
);
205 st
->ss
->update_super(st
, &info
, "linear-grow-new", newdev
,
208 if (st
->ss
->store_super(st
, nfd
)) {
209 pr_err("Cannot store new superblock on %s\n",
216 if (ioctl(fd
, ADD_NEW_DISK
, &info
.disk
) != 0) {
217 pr_err("Cannot add new disk to this array\n");
220 /* Well, that seems to have worked.
221 * Now go through and update all superblocks
224 if (ioctl(fd
, GET_ARRAY_INFO
, &info
.array
) < 0) {
225 pr_err("cannot get array info for %s\n", devname
);
230 for (d
=0 ; d
< info
.array
.raid_disks
; d
++) {
231 mdu_disk_info_t disk
;
235 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0) {
236 pr_err("cannot get device detail for device %d\n",
240 dv
= map_dev(disk
.major
, disk
.minor
, 1);
242 pr_err("cannot find device file for device %d\n",
246 fd2
= dev_open(dv
, O_RDWR
);
248 pr_err("cannot open device file %s\n", dv
);
251 if (st
->ss
->load_super(st
, fd2
, NULL
)) {
252 pr_err("cannot find super block on %s\n", dv
);
256 info
.array
.raid_disks
= nd
+1;
257 info
.array
.nr_disks
= nd
+1;
258 info
.array
.active_disks
= nd
+1;
259 info
.array
.working_disks
= nd
+1;
261 st
->ss
->update_super(st
, &info
, "linear-grow-update", dv
,
264 if (st
->ss
->store_super(st
, fd2
)) {
265 pr_err("Cannot store new superblock on %s\n", dv
);
275 int Grow_addbitmap(char *devname
, int fd
, struct context
*c
, struct shape
*s
)
278 * First check that array doesn't have a bitmap
279 * Then create the bitmap
282 * For internal bitmaps, we need to check the version,
283 * find all the active devices, and write the bitmap block
286 mdu_bitmap_file_t bmf
;
287 mdu_array_info_t array
;
288 struct supertype
*st
;
289 char *subarray
= NULL
;
290 int major
= BITMAP_MAJOR_HI
;
291 int vers
= md_get_version(fd
);
292 unsigned long long bitmapsize
, array_size
;
295 major
= BITMAP_MAJOR_HOSTENDIAN
;
296 pr_err("Warning - bitmaps created on this kernel are not portable\n"
297 " between different architectures. Consider upgrading the Linux kernel.\n");
301 * We only ever get called if s->bitmap_file is != NULL, so this check
302 * is just here to quiet down static code checkers.
307 if (strcmp(s
->bitmap_file
, "clustered") == 0)
308 major
= BITMAP_MAJOR_CLUSTERED
;
310 if (ioctl(fd
, GET_BITMAP_FILE
, &bmf
) != 0) {
312 pr_err("Memory allocation failure.\n");
314 pr_err("bitmaps not supported by this kernel.\n");
317 if (bmf
.pathname
[0]) {
318 if (strcmp(s
->bitmap_file
,"none") == 0) {
319 if (ioctl(fd
, SET_BITMAP_FILE
, -1) != 0) {
320 pr_err("failed to remove bitmap %s\n",
326 pr_err("%s already has a bitmap (%s)\n",
327 devname
, bmf
.pathname
);
330 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) != 0) {
331 pr_err("cannot get array status for %s\n", devname
);
334 if (array
.state
& (1 << MD_SB_BITMAP_PRESENT
)) {
335 if (strcmp(s
->bitmap_file
, "none")==0) {
336 array
.state
&= ~(1 << MD_SB_BITMAP_PRESENT
);
337 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
338 if (array
.state
& (1 << MD_SB_CLUSTERED
))
339 pr_err("failed to remove clustered bitmap.\n");
341 pr_err("failed to remove internal bitmap.\n");
346 pr_err("bitmap already present on %s\n", devname
);
350 if (strcmp(s
->bitmap_file
, "none") == 0) {
351 pr_err("no bitmap found on %s\n", devname
);
354 if (array
.level
<= 0) {
355 pr_err("Bitmaps not meaningful with level %s\n",
356 map_num(pers
, array
.level
)?:"of this array");
359 bitmapsize
= array
.size
;
361 if (get_dev_size(fd
, NULL
, &array_size
) &&
362 array_size
> (0x7fffffffULL
<< 9)) {
363 /* Array is big enough that we cannot trust array.size
364 * try other approaches
366 bitmapsize
= get_component_size(fd
);
368 if (bitmapsize
== 0) {
369 pr_err("Cannot reliably determine size of array to create bitmap - sorry.\n");
373 if (array
.level
== 10) {
376 ncopies
= (array
.layout
& 255) * ((array
.layout
>> 8) & 255);
377 bitmapsize
= bitmapsize
* array
.raid_disks
/ ncopies
;
380 st
= super_by_fd(fd
, &subarray
);
382 pr_err("Cannot understand version %d.%d\n",
383 array
.major_version
, array
.minor_version
);
387 pr_err("Cannot add bitmaps to sub-arrays yet\n");
392 if (strcmp(s
->bitmap_file
, "internal") == 0 ||
393 strcmp(s
->bitmap_file
, "clustered") == 0) {
396 int offset_setable
= 0;
398 if (st
->ss
->add_internal_bitmap
== NULL
) {
399 pr_err("Internal bitmaps not supported with %s metadata\n", st
->ss
->name
);
402 st
->nodes
= c
->nodes
;
403 st
->cluster_name
= c
->homecluster
;
404 mdi
= sysfs_read(fd
, NULL
, GET_BITMAP_LOCATION
);
407 for (d
= 0; d
< st
->max_devs
; d
++) {
408 mdu_disk_info_t disk
;
413 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
415 if (disk
.major
== 0 && disk
.minor
== 0)
417 if ((disk
.state
& (1 << MD_DISK_SYNC
)) == 0)
419 dv
= map_dev(disk
.major
, disk
.minor
, 1);
422 fd2
= dev_open(dv
, O_RDWR
);
425 rv
= st
->ss
->load_super(st
, fd2
, NULL
);
427 rv
= st
->ss
->add_internal_bitmap(
428 st
, &s
->bitmap_chunk
, c
->delay
,
429 s
->write_behind
, bitmapsize
,
430 offset_setable
, major
);
432 st
->ss
->write_bitmap(st
, fd2
,
435 pr_err("failed to create internal bitmap - chunksize problem.\n");
438 pr_err("failed to load super-block.\n");
444 if (offset_setable
) {
445 st
->ss
->getinfo_super(st
, mdi
, NULL
);
446 sysfs_init(mdi
, fd
, NULL
);
447 rv
= sysfs_set_num_signed(mdi
, NULL
, "bitmap/location",
450 if (strcmp(s
->bitmap_file
, "clustered") == 0)
451 array
.state
|= (1 << MD_SB_CLUSTERED
);
452 array
.state
|= (1 << MD_SB_BITMAP_PRESENT
);
453 rv
= ioctl(fd
, SET_ARRAY_INFO
, &array
);
457 pr_err("Cannot add bitmap while array is resyncing or reshaping etc.\n");
458 pr_err("failed to set internal bitmap.\n");
465 int max_devs
= st
->max_devs
;
467 /* try to load a superblock */
468 for (d
= 0; d
< max_devs
; d
++) {
469 mdu_disk_info_t disk
;
473 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
475 if ((disk
.major
==0 && disk
.minor
== 0) ||
476 (disk
.state
& (1 << MD_DISK_REMOVED
)))
478 dv
= map_dev(disk
.major
, disk
.minor
, 1);
481 fd2
= dev_open(dv
, O_RDONLY
);
483 if (st
->ss
->load_super(st
, fd2
, NULL
) == 0) {
485 st
->ss
->uuid_from_super(st
, uuid
);
492 pr_err("cannot find UUID for array!\n");
495 if (CreateBitmap(s
->bitmap_file
, c
->force
, (char*)uuid
,
496 s
->bitmap_chunk
, c
->delay
, s
->write_behind
,
497 bitmapsize
, major
)) {
500 bitmap_fd
= open(s
->bitmap_file
, O_RDWR
);
502 pr_err("weird: %s cannot be opened\n", s
->bitmap_file
);
505 if (ioctl(fd
, SET_BITMAP_FILE
, bitmap_fd
) < 0) {
508 pr_err("Cannot add bitmap while array is resyncing or reshaping etc.\n");
509 pr_err("Cannot set bitmap file for %s: %s\n",
510 devname
, strerror(err
));
519 * When reshaping an array we might need to backup some data.
520 * This is written to all spares with a 'super_block' describing it.
521 * The superblock goes 4K from the end of the used space on the
523 * It if written after the backup is complete.
524 * It has the following structure.
527 static struct mdp_backup_super
{
528 char magic
[16]; /* md_backup_data-1 or -2 */
531 /* start/sizes in 512byte sectors */
532 __u64 devstart
; /* address on backup device/file of data */
535 __u32 sb_csum
; /* csum of preceeding bytes. */
537 __u64 devstart2
; /* offset in to data of second section */
540 __u32 sb_csum2
; /* csum of preceeding bytes. */
542 } __attribute__((aligned(512))) bsb
, bsb2
;
544 static __u32
bsb_csum(char *buf
, int len
)
548 for (i
= 0; i
< len
; i
++)
549 csum
= (csum
<<3) + buf
[0];
550 return __cpu_to_le32(csum
);
553 static int check_idle(struct supertype
*st
)
555 /* Check that all member arrays for this container, or the
556 * container of this array, are idle
558 char *container
= (st
->container_devnm
[0]
559 ? st
->container_devnm
: st
->devnm
);
560 struct mdstat_ent
*ent
, *e
;
563 ent
= mdstat_read(0, 0);
564 for (e
= ent
; e
; e
= e
->next
) {
565 if (!is_container_member(e
, container
))
567 if (e
->percent
>= 0) {
576 static int freeze_container(struct supertype
*st
)
578 char *container
= (st
->container_devnm
[0]
579 ? st
->container_devnm
: st
->devnm
);
584 if (block_monitor(container
, 1)) {
585 pr_err("failed to freeze container\n");
592 static void unfreeze_container(struct supertype
*st
)
594 char *container
= (st
->container_devnm
[0]
595 ? st
->container_devnm
: st
->devnm
);
597 unblock_monitor(container
, 1);
600 static int freeze(struct supertype
*st
)
602 /* Try to freeze resync/rebuild on this array/container.
603 * Return -1 if the array is busy,
604 * return -2 container cannot be frozen,
605 * return 0 if this kernel doesn't support 'frozen'
606 * return 1 if it worked.
608 if (st
->ss
->external
)
609 return freeze_container(st
);
611 struct mdinfo
*sra
= sysfs_read(-1, st
->devnm
, GET_VERSION
);
617 /* Need to clear any 'read-auto' status */
618 if (sysfs_get_str(sra
, NULL
, "array_state", buf
, 20) > 0 &&
619 strncmp(buf
, "read-auto", 9) == 0)
620 sysfs_set_str(sra
, NULL
, "array_state", "clean");
622 err
= sysfs_freeze_array(sra
);
628 static void unfreeze(struct supertype
*st
)
630 if (st
->ss
->external
)
631 return unfreeze_container(st
);
633 struct mdinfo
*sra
= sysfs_read(-1, st
->devnm
, GET_VERSION
);
637 sysfs_get_str(sra
, NULL
, "sync_action", buf
, 20) > 0
638 && strcmp(buf
, "frozen\n") == 0)
639 sysfs_set_str(sra
, NULL
, "sync_action", "idle");
644 static void wait_reshape(struct mdinfo
*sra
)
646 int fd
= sysfs_get_fd(sra
, NULL
, "sync_action");
652 while (sysfs_fd_get_str(fd
, action
, 20) > 0 &&
653 strncmp(action
, "reshape", 7) == 0)
654 sysfs_wait(fd
, NULL
);
658 static int reshape_super(struct supertype
*st
, unsigned long long size
,
659 int level
, int layout
, int chunksize
, int raid_disks
,
660 int delta_disks
, char *backup_file
, char *dev
,
661 int direction
, int verbose
)
663 /* nothing extra to check in the native case */
664 if (!st
->ss
->external
)
666 if (!st
->ss
->reshape_super
||
667 !st
->ss
->manage_reshape
) {
668 pr_err("%s metadata does not support reshape\n",
673 return st
->ss
->reshape_super(st
, size
, level
, layout
, chunksize
,
674 raid_disks
, delta_disks
, backup_file
, dev
,
678 static void sync_metadata(struct supertype
*st
)
680 if (st
->ss
->external
) {
681 if (st
->update_tail
) {
682 flush_metadata_updates(st
);
683 st
->update_tail
= &st
->updates
;
685 st
->ss
->sync_metadata(st
);
689 static int subarray_set_num(char *container
, struct mdinfo
*sra
, char *name
, int n
)
691 /* when dealing with external metadata subarrays we need to be
692 * prepared to handle EAGAIN. The kernel may need to wait for
693 * mdmon to mark the array active so the kernel can handle
694 * allocations/writeback when preparing the reshape action
695 * (md_allow_write()). We temporarily disable safe_mode_delay
696 * to close a race with the array_state going clean before the
697 * next write to raid_disks / stripe_cache_size
702 /* only 'raid_disks' and 'stripe_cache_size' trigger md_allow_write */
704 (strcmp(name
, "raid_disks") != 0 &&
705 strcmp(name
, "stripe_cache_size") != 0))
706 return sysfs_set_num(sra
, NULL
, name
, n
);
708 rc
= sysfs_get_str(sra
, NULL
, "safe_mode_delay", safe
, sizeof(safe
));
711 sysfs_set_num(sra
, NULL
, "safe_mode_delay", 0);
712 rc
= sysfs_set_num(sra
, NULL
, name
, n
);
713 if (rc
< 0 && errno
== EAGAIN
) {
714 ping_monitor(container
);
715 /* if we get EAGAIN here then the monitor is not active
718 rc
= sysfs_set_num(sra
, NULL
, name
, n
);
720 sysfs_set_str(sra
, NULL
, "safe_mode_delay", safe
);
724 int start_reshape(struct mdinfo
*sra
, int already_running
,
725 int before_data_disks
, int data_disks
)
728 unsigned long long sync_max_to_set
;
730 sysfs_set_num(sra
, NULL
, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL
);
731 err
= sysfs_set_num(sra
, NULL
, "suspend_hi", sra
->reshape_progress
);
732 err
= err
?: sysfs_set_num(sra
, NULL
, "suspend_lo",
733 sra
->reshape_progress
);
734 if (before_data_disks
<= data_disks
)
735 sync_max_to_set
= sra
->reshape_progress
/ data_disks
;
737 sync_max_to_set
= (sra
->component_size
* data_disks
738 - sra
->reshape_progress
) / data_disks
;
739 if (!already_running
)
740 sysfs_set_num(sra
, NULL
, "sync_min", sync_max_to_set
);
741 err
= err
?: sysfs_set_num(sra
, NULL
, "sync_max", sync_max_to_set
);
742 if (!already_running
&& err
== 0) {
745 err
= sysfs_set_str(sra
, NULL
, "sync_action", "reshape");
748 } while (err
&& errno
== EBUSY
&& cnt
-- > 0);
753 void abort_reshape(struct mdinfo
*sra
)
755 sysfs_set_str(sra
, NULL
, "sync_action", "idle");
757 * Prior to kernel commit: 23ddff3792f6 ("md: allow suspend_lo and
758 * suspend_hi to decrease as well as increase.")
759 * you could only increase suspend_{lo,hi} unless the region they
760 * covered was empty. So to reset to 0, you need to push suspend_lo
761 * up past suspend_hi first. So to maximize the chance of mdadm
762 * working on all kernels, we want to keep doing that.
764 sysfs_set_num(sra
, NULL
, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL
);
765 sysfs_set_num(sra
, NULL
, "suspend_hi", 0);
766 sysfs_set_num(sra
, NULL
, "suspend_lo", 0);
767 sysfs_set_num(sra
, NULL
, "sync_min", 0);
768 // It isn't safe to reset sync_max as we aren't monitoring.
769 // Array really should be stopped at this point.
772 int remove_disks_for_takeover(struct supertype
*st
,
777 struct mdinfo
*remaining
;
780 if (st
->ss
->external
) {
782 struct mdinfo
*arrays
= st
->ss
->container_content(st
, NULL
);
784 * containter_content returns list of arrays in container
785 * If arrays->next is not NULL it means that there are
786 * 2 arrays in container and operation should be blocked
793 pr_err("Error. Cannot perform operation on /dev/%s\n", st
->devnm
);
794 pr_err("For this operation it MUST be single array in container\n");
800 if (sra
->array
.level
== 10)
801 nr_of_copies
= layout
& 0xff;
802 else if (sra
->array
.level
== 1)
803 nr_of_copies
= sra
->array
.raid_disks
;
807 remaining
= sra
->devs
;
809 /* for each 'copy', select one device and remove from the list. */
810 for (slot
= 0; slot
< sra
->array
.raid_disks
; slot
+= nr_of_copies
) {
811 struct mdinfo
**diskp
;
814 /* Find a working device to keep */
815 for (diskp
= &remaining
; *diskp
; diskp
= &(*diskp
)->next
) {
816 struct mdinfo
*disk
= *diskp
;
818 if (disk
->disk
.raid_disk
< slot
)
820 if (disk
->disk
.raid_disk
>= slot
+ nr_of_copies
)
822 if (disk
->disk
.state
& (1<<MD_DISK_REMOVED
))
824 if (disk
->disk
.state
& (1<<MD_DISK_FAULTY
))
826 if (!(disk
->disk
.state
& (1<<MD_DISK_SYNC
)))
829 /* We have found a good disk to use! */
831 disk
->next
= sra
->devs
;
840 if (slot
< sra
->array
.raid_disks
) {
841 /* didn't find all slots */
847 sra
->devs
= remaining
;
851 /* Remove all 'remaining' devices from the array */
853 struct mdinfo
*sd
= remaining
;
854 remaining
= sd
->next
;
856 sysfs_set_str(sra
, sd
, "state", "faulty");
857 sysfs_set_str(sra
, sd
, "slot", "none");
858 /* for external metadata disks should be removed in mdmon */
859 if (!st
->ss
->external
)
860 sysfs_set_str(sra
, sd
, "state", "remove");
861 sd
->disk
.state
|= (1<<MD_DISK_REMOVED
);
862 sd
->disk
.state
&= ~(1<<MD_DISK_SYNC
);
863 sd
->next
= sra
->devs
;
869 void reshape_free_fdlist(int *fdlist
,
870 unsigned long long *offsets
,
875 for (i
= 0; i
< size
; i
++)
883 int reshape_prepare_fdlist(char *devname
,
887 unsigned long blocks
,
890 unsigned long long *offsets
)
896 for (d
= 0; d
<= nrdisks
; d
++)
899 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
900 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
902 if (sd
->disk
.state
& (1<<MD_DISK_SYNC
) &&
903 sd
->disk
.raid_disk
< raid_disks
) {
904 char *dn
= map_dev(sd
->disk
.major
,
906 fdlist
[sd
->disk
.raid_disk
]
907 = dev_open(dn
, O_RDONLY
);
908 offsets
[sd
->disk
.raid_disk
] = sd
->data_offset
*512;
909 if (fdlist
[sd
->disk
.raid_disk
] < 0) {
910 pr_err("%s: cannot open component %s\n",
911 devname
, dn
? dn
: "-unknown-");
915 } else if (backup_file
== NULL
) {
917 char *dn
= map_dev(sd
->disk
.major
,
919 fdlist
[d
] = dev_open(dn
, O_RDWR
);
920 offsets
[d
] = (sd
->data_offset
+ sra
->component_size
- blocks
- 8)*512;
922 pr_err("%s: cannot open component %s\n",
923 devname
, dn
? dn
: "-unknown-");
934 int reshape_open_backup_file(char *backup_file
,
939 unsigned long long *offsets
,
943 /* Return 1 on success, 0 on any form of failure */
944 /* need to check backup file is large enough */
950 *fdlist
= open(backup_file
, O_RDWR
|O_CREAT
|(restart
? O_TRUNC
: O_EXCL
),
954 pr_err("%s: cannot create backup file %s: %s\n",
955 devname
, backup_file
, strerror(errno
));
958 /* Guard against backup file being on array device.
959 * If array is partitioned or if LVM etc is in the
960 * way this will not notice, but it is better than
963 fstat(*fdlist
, &stb
);
966 if (stb
.st_rdev
== dev
) {
967 pr_err("backup file must NOT be on the array being reshaped.\n");
973 for (i
=0; i
< blocks
+ 8 ; i
++) {
974 if (write(*fdlist
, buf
, 512) != 512) {
975 pr_err("%s: cannot create backup file %s: %s\n",
976 devname
, backup_file
, strerror(errno
));
980 if (fsync(*fdlist
) != 0) {
981 pr_err("%s: cannot create backup file %s: %s\n",
982 devname
, backup_file
, strerror(errno
));
986 if (!restart
&& strncmp(backup_file
, MAP_DIR
, strlen(MAP_DIR
)) != 0) {
987 char *bu
= make_backup(sys_name
);
988 if (symlink(backup_file
, bu
))
989 pr_err("Recording backup file in " MAP_DIR
" failed: %s\n",
997 unsigned long compute_backup_blocks(int nchunk
, int ochunk
,
998 unsigned int ndata
, unsigned int odata
)
1000 unsigned long a
, b
, blocks
;
1001 /* So how much do we need to backup.
1002 * We need an amount of data which is both a whole number of
1003 * old stripes and a whole number of new stripes.
1004 * So LCM for (chunksize*datadisks).
1006 a
= (ochunk
/512) * odata
;
1007 b
= (nchunk
/512) * ndata
;
1010 /* LCM == product / GCD */
1011 blocks
= (ochunk
/512) * (nchunk
/512) * odata
* ndata
/ a
;
1016 char *analyse_change(char *devname
, struct mdinfo
*info
, struct reshape
*re
)
1018 /* Based on the current array state in info->array and
1019 * the changes in info->new_* etc, determine:
1020 * - whether the change is possible
1021 * - Intermediate level/raid_disks/layout
1022 * - whether a restriping reshape is needed
1023 * - number of sectors in minimum change unit. This
1024 * will cover a whole number of stripes in 'before' and
1027 * Return message if the change should be rejected
1028 * NULL if the change can be achieved
1030 * This can be called as part of starting a reshape, or
1031 * when assembling an array that is undergoing reshape.
1033 int near
, far
, offset
, copies
;
1035 int old_chunk
, new_chunk
;
1036 /* delta_parity records change in number of devices
1037 * caused by level change
1039 int delta_parity
= 0;
1041 memset(re
, 0, sizeof(*re
));
1043 /* If a new level not explicitly given, we assume no-change */
1044 if (info
->new_level
== UnSet
)
1045 info
->new_level
= info
->array
.level
;
1047 if (info
->new_chunk
)
1048 switch (info
->new_level
) {
1054 /* chunk size is meaningful, must divide component_size
1057 if (info
->component_size
% (info
->new_chunk
/512)) {
1058 unsigned long long shrink
= info
->component_size
;
1059 shrink
&= ~(unsigned long long)(info
->new_chunk
/512-1);
1060 pr_err("New chunk size (%dK) does not evenly divide device size (%lluk)\n",
1061 info
->new_chunk
/1024, info
->component_size
/2);
1062 pr_err("After shrinking any filesystem, \"mdadm --grow %s --size %llu\"\n",
1064 pr_err("will shrink the array so the given chunk size would work.\n");
1069 return "chunk size not meaningful for this level";
1072 info
->new_chunk
= info
->array
.chunk_size
;
1074 switch (info
->array
.level
) {
1076 return "No reshape is possibly for this RAID level";
1078 if (info
->delta_disks
!= UnSet
)
1079 return "Only --add is supported for LINEAR, setting --raid-disks is not needed";
1081 return "Only --add is supported for LINEAR, other --grow options are not meaningful";
1083 /* RAID1 can convert to RAID1 with different disks, or
1084 * raid5 with 2 disks, or
1087 if (info
->new_level
> 1 &&
1088 (info
->component_size
& 7))
1089 return "Cannot convert RAID1 of this size - reduce size to multiple of 4K first.";
1090 if (info
->new_level
== 0) {
1091 if (info
->delta_disks
!= UnSet
&&
1092 info
->delta_disks
!= 0)
1093 return "Cannot change number of disks with RAID1->RAID0 conversion";
1095 re
->before
.data_disks
= 1;
1096 re
->after
.data_disks
= 1;
1099 if (info
->new_level
== 1) {
1100 if (info
->delta_disks
== UnSet
)
1101 /* Don't know what to do */
1102 return "no change requested for Growing RAID1";
1106 if (info
->array
.raid_disks
!= 2 &&
1107 info
->new_level
== 5)
1108 return "Can only convert a 2-device array to RAID5";
1109 if (info
->array
.raid_disks
== 2 &&
1110 info
->new_level
== 5) {
1113 re
->before
.data_disks
= 1;
1114 if (info
->delta_disks
!= UnSet
&&
1115 info
->delta_disks
!= 0)
1116 re
->after
.data_disks
= 1 + info
->delta_disks
;
1118 re
->after
.data_disks
= 1;
1119 if (re
->after
.data_disks
< 1)
1120 return "Number of disks too small for RAID5";
1122 re
->before
.layout
= ALGORITHM_LEFT_SYMMETRIC
;
1123 info
->array
.chunk_size
= 65536;
1126 /* Could do some multi-stage conversions, but leave that to
1129 return "Impossibly level change request for RAID1";
1132 /* RAID10 can be converted from near mode to
1133 * RAID0 by removing some devices.
1134 * It can also be reshaped if the kernel supports
1137 switch (info
->new_level
) {
1139 if ((info
->array
.layout
& ~0xff) != 0x100)
1140 return "Cannot Grow RAID10 with far/offset layout";
1141 /* number of devices must be multiple of number of copies */
1142 if (info
->array
.raid_disks
% (info
->array
.layout
& 0xff))
1143 return "RAID10 layout too complex for Grow operation";
1145 new_disks
= (info
->array
.raid_disks
1146 / (info
->array
.layout
& 0xff));
1147 if (info
->delta_disks
== UnSet
)
1148 info
->delta_disks
= (new_disks
1149 - info
->array
.raid_disks
);
1151 if (info
->delta_disks
!= new_disks
- info
->array
.raid_disks
)
1152 return "New number of raid-devices impossible for RAID10";
1153 if (info
->new_chunk
&&
1154 info
->new_chunk
!= info
->array
.chunk_size
)
1155 return "Cannot change chunk-size with RAID10 Grow";
1159 re
->before
.data_disks
= new_disks
;
1160 re
->after
.data_disks
= re
->before
.data_disks
;
1164 near
= info
->array
.layout
& 0xff;
1165 far
= (info
->array
.layout
>> 8) & 0xff;
1166 offset
= info
->array
.layout
& 0x10000;
1167 if (far
> 1 && !offset
)
1168 return "Cannot reshape RAID10 in far-mode";
1169 copies
= near
* far
;
1171 old_chunk
= info
->array
.chunk_size
* far
;
1173 if (info
->new_layout
== UnSet
)
1174 info
->new_layout
= info
->array
.layout
;
1176 near
= info
->new_layout
& 0xff;
1177 far
= (info
->new_layout
>> 8) & 0xff;
1178 offset
= info
->new_layout
& 0x10000;
1179 if (far
> 1 && !offset
)
1180 return "Cannot reshape RAID10 to far-mode";
1181 if (near
* far
!= copies
)
1182 return "Cannot change number of copies when reshaping RAID10";
1184 if (info
->delta_disks
== UnSet
)
1185 info
->delta_disks
= 0;
1186 new_disks
= (info
->array
.raid_disks
+
1189 new_chunk
= info
->new_chunk
* far
;
1192 re
->before
.layout
= info
->array
.layout
;
1193 re
->before
.data_disks
= info
->array
.raid_disks
;
1194 re
->after
.layout
= info
->new_layout
;
1195 re
->after
.data_disks
= new_disks
;
1196 /* For RAID10 we don't do backup but do allow reshape,
1197 * so set backup_blocks to INVALID_SECTORS rather than
1199 * And there is no need to synchronise stripes on both
1200 * 'old' and 'new'. So the important
1201 * number is the minimum data_offset difference
1202 * which is the larger of (offset copies * chunk).
1204 re
->backup_blocks
= INVALID_SECTORS
;
1205 re
->min_offset_change
= max(old_chunk
, new_chunk
) / 512;
1206 if (new_disks
< re
->before
.data_disks
&&
1207 info
->space_after
< re
->min_offset_change
)
1208 /* Reduce component size by one chunk */
1209 re
->new_size
= (info
->component_size
-
1210 re
->min_offset_change
);
1212 re
->new_size
= info
->component_size
;
1213 re
->new_size
= re
->new_size
* new_disks
/ copies
;
1217 return "RAID10 can only be changed to RAID0";
1220 /* RAID0 can be converted to RAID10, or to RAID456 */
1221 if (info
->new_level
== 10) {
1222 if (info
->new_layout
== UnSet
&& info
->delta_disks
== UnSet
) {
1223 /* Assume near=2 layout */
1224 info
->new_layout
= 0x102;
1225 info
->delta_disks
= info
->array
.raid_disks
;
1227 if (info
->new_layout
== UnSet
) {
1228 int copies
= 1 + (info
->delta_disks
1229 / info
->array
.raid_disks
);
1230 if (info
->array
.raid_disks
* (copies
-1)
1231 != info
->delta_disks
)
1232 return "Impossible number of devices for RAID0->RAID10";
1233 info
->new_layout
= 0x100 + copies
;
1235 if (info
->delta_disks
== UnSet
) {
1236 int copies
= info
->new_layout
& 0xff;
1237 if (info
->new_layout
!= 0x100 + copies
)
1238 return "New layout impossible for RAID0->RAID10";;
1239 info
->delta_disks
= (copies
- 1) *
1240 info
->array
.raid_disks
;
1242 if (info
->new_chunk
&&
1243 info
->new_chunk
!= info
->array
.chunk_size
)
1244 return "Cannot change chunk-size with RAID0->RAID10";
1247 re
->before
.data_disks
= (info
->array
.raid_disks
+
1249 re
->after
.data_disks
= re
->before
.data_disks
;
1250 re
->before
.layout
= info
->new_layout
;
1254 /* RAID0 can also covert to RAID0/4/5/6 by first converting to
1255 * a raid4 style layout of the final level.
1257 switch (info
->new_level
) {
1262 re
->before
.layout
= 0;
1267 re
->before
.layout
= ALGORITHM_PARITY_N
;
1268 if (info
->new_layout
== UnSet
)
1269 info
->new_layout
= map_name(r5layout
, "default");
1274 re
->before
.layout
= ALGORITHM_PARITY_N
;
1275 if (info
->new_layout
== UnSet
)
1276 info
->new_layout
= map_name(r6layout
, "default");
1279 return "Impossible level change requested";
1281 re
->before
.data_disks
= info
->array
.raid_disks
;
1282 /* determining 'after' layout happens outside this 'switch' */
1286 info
->array
.layout
= ALGORITHM_PARITY_N
;
1288 switch (info
->new_level
) {
1292 re
->level
= info
->array
.level
;
1293 re
->before
.data_disks
= info
->array
.raid_disks
- 1;
1294 re
->before
.layout
= info
->array
.layout
;
1298 re
->before
.data_disks
= info
->array
.raid_disks
- 1;
1299 re
->before
.layout
= info
->array
.layout
;
1304 re
->before
.data_disks
= info
->array
.raid_disks
- 1;
1305 switch (info
->array
.layout
) {
1306 case ALGORITHM_LEFT_ASYMMETRIC
:
1307 re
->before
.layout
= ALGORITHM_LEFT_ASYMMETRIC_6
;
1309 case ALGORITHM_RIGHT_ASYMMETRIC
:
1310 re
->before
.layout
= ALGORITHM_RIGHT_ASYMMETRIC_6
;
1312 case ALGORITHM_LEFT_SYMMETRIC
:
1313 re
->before
.layout
= ALGORITHM_LEFT_SYMMETRIC_6
;
1315 case ALGORITHM_RIGHT_SYMMETRIC
:
1316 re
->before
.layout
= ALGORITHM_RIGHT_SYMMETRIC_6
;
1318 case ALGORITHM_PARITY_0
:
1319 re
->before
.layout
= ALGORITHM_PARITY_0_6
;
1321 case ALGORITHM_PARITY_N
:
1322 re
->before
.layout
= ALGORITHM_PARITY_N_6
;
1325 return "Cannot convert an array with this layout";
1329 if (info
->array
.raid_disks
!= 2)
1330 return "Can only convert a 2-device array to RAID1";
1331 if (info
->delta_disks
!= UnSet
&&
1332 info
->delta_disks
!= 0)
1333 return "Cannot set raid_disk when converting RAID5->RAID1";
1335 info
->new_chunk
= 0;
1338 return "Impossible level change requested";
1342 switch (info
->new_level
) {
1348 re
->before
.data_disks
= info
->array
.raid_disks
- 2;
1349 re
->before
.layout
= info
->array
.layout
;
1352 return "Impossible level change requested";
1357 /* If we reached here then it looks like a re-stripe is
1358 * happening. We have determined the intermediate level
1359 * and initial raid_disks/layout and stored these in 're'.
1361 * We need to deduce the final layout that can be atomically
1362 * converted to the end state.
1364 switch (info
->new_level
) {
1366 /* We can only get to RAID0 from RAID4 or RAID5
1367 * with appropriate layout and one extra device
1369 if (re
->level
!= 4 && re
->level
!= 5)
1370 return "Cannot covert to RAID0 from this level";
1372 switch (re
->level
) {
1374 re
->before
.layout
= 0;
1375 re
->after
.layout
= 0;
1378 re
->after
.layout
= ALGORITHM_PARITY_N
;
1384 /* We can only get to RAID4 from RAID5 */
1385 if (re
->level
!= 4 && re
->level
!= 5)
1386 return "Cannot convert to RAID4 from this level";
1388 switch (re
->level
) {
1390 re
->after
.layout
= 0;
1393 re
->after
.layout
= ALGORITHM_PARITY_N
;
1399 /* We get to RAID5 from RAID5 or RAID6 */
1400 if (re
->level
!= 5 && re
->level
!= 6)
1401 return "Cannot convert to RAID5 from this level";
1403 switch (re
->level
) {
1405 if (info
->new_layout
== UnSet
)
1406 re
->after
.layout
= re
->before
.layout
;
1408 re
->after
.layout
= info
->new_layout
;
1411 if (info
->new_layout
== UnSet
)
1412 info
->new_layout
= re
->before
.layout
;
1414 /* after.layout needs to be raid6 version of new_layout */
1415 if (info
->new_layout
== ALGORITHM_PARITY_N
)
1416 re
->after
.layout
= ALGORITHM_PARITY_N
;
1419 char *ls
= map_num(r5layout
, info
->new_layout
);
1422 /* Current RAID6 layout has a RAID5
1425 strcat(strcpy(layout
, ls
), "-6");
1426 l
= map_name(r6layout
, layout
);
1428 return "Cannot find RAID6 layout to convert to";
1430 /* Current RAID6 has no equivalent.
1431 * If it is already a '-6' layout we
1432 * can leave it unchanged, else we must
1435 ls
= map_num(r6layout
, info
->new_layout
);
1437 strcmp(ls
+strlen(ls
)-2, "-6") != 0)
1438 return "Please specify new layout";
1439 l
= info
->new_layout
;
1441 re
->after
.layout
= l
;
1447 /* We must already be at level 6 */
1449 return "Impossible level change";
1450 if (info
->new_layout
== UnSet
)
1451 re
->after
.layout
= info
->array
.layout
;
1453 re
->after
.layout
= info
->new_layout
;
1456 return "Impossible level change requested";
1458 if (info
->delta_disks
== UnSet
)
1459 info
->delta_disks
= delta_parity
;
1461 re
->after
.data_disks
= (re
->before
.data_disks
1464 switch (re
->level
) {
1465 case 6: re
->parity
= 2;
1468 case 5: re
->parity
= 1;
1470 default: re
->parity
= 0;
1473 /* So we have a restripe operation, we need to calculate the number
1474 * of blocks per reshape operation.
1476 re
->new_size
= info
->component_size
* re
->before
.data_disks
;
1477 if (info
->new_chunk
== 0)
1478 info
->new_chunk
= info
->array
.chunk_size
;
1479 if (re
->after
.data_disks
== re
->before
.data_disks
&&
1480 re
->after
.layout
== re
->before
.layout
&&
1481 info
->new_chunk
== info
->array
.chunk_size
) {
1482 /* Nothing to change, can change level immediately. */
1483 re
->level
= info
->new_level
;
1484 re
->backup_blocks
= 0;
1487 if (re
->after
.data_disks
== 1 && re
->before
.data_disks
== 1) {
1488 /* chunk and layout changes make no difference */
1489 re
->level
= info
->new_level
;
1490 re
->backup_blocks
= 0;
1494 if (re
->after
.data_disks
== re
->before
.data_disks
&&
1495 get_linux_version() < 2006032)
1496 return "in-place reshape is not safe before 2.6.32 - sorry.";
1498 if (re
->after
.data_disks
< re
->before
.data_disks
&&
1499 get_linux_version() < 2006030)
1500 return "reshape to fewer devices is not supported before 2.6.30 - sorry.";
1502 re
->backup_blocks
= compute_backup_blocks(
1503 info
->new_chunk
, info
->array
.chunk_size
,
1504 re
->after
.data_disks
,
1505 re
->before
.data_disks
);
1506 re
->min_offset_change
= re
->backup_blocks
/ re
->before
.data_disks
;
1508 re
->new_size
= info
->component_size
* re
->after
.data_disks
;
1512 static int set_array_size(struct supertype
*st
, struct mdinfo
*sra
,
1515 struct mdinfo
*info
;
1519 if ((st
== NULL
) || (sra
== NULL
))
1522 if (text_version
== NULL
)
1523 text_version
= sra
->text_version
;
1524 subarray
= strchr(text_version
+1, '/')+1;
1525 info
= st
->ss
->container_content(st
, subarray
);
1527 unsigned long long current_size
= 0;
1528 unsigned long long new_size
=
1529 info
->custom_array_size
/2;
1531 if (sysfs_get_ll(sra
, NULL
, "array_size", ¤t_size
) == 0 &&
1532 new_size
> current_size
) {
1533 if (sysfs_set_num(sra
, NULL
, "array_size", new_size
)
1535 dprintf("Error: Cannot set array size");
1538 dprintf("Array size changed");
1540 dprintf_cont(" from %llu to %llu.\n",
1541 current_size
, new_size
);
1545 dprintf("Error: set_array_size(): info pointer in NULL\n");
1550 static int reshape_array(char *container
, int fd
, char *devname
,
1551 struct supertype
*st
, struct mdinfo
*info
,
1552 int force
, struct mddev_dev
*devlist
,
1553 unsigned long long data_offset
,
1554 char *backup_file
, int verbose
, int forked
,
1555 int restart
, int freeze_reshape
);
1556 static int reshape_container(char *container
, char *devname
,
1558 struct supertype
*st
,
1559 struct mdinfo
*info
,
1561 char *backup_file
, int verbose
,
1562 int forked
, int restart
, int freeze_reshape
);
1564 int Grow_reshape(char *devname
, int fd
,
1565 struct mddev_dev
*devlist
,
1566 unsigned long long data_offset
,
1567 struct context
*c
, struct shape
*s
)
1569 /* Make some changes in the shape of an array.
1570 * The kernel must support the change.
1572 * There are three different changes. Each can trigger
1573 * a resync or recovery so we freeze that until we have
1574 * requested everything (if kernel supports freezing - 2.6.30).
1576 * - change size (i.e. component_size)
1578 * - change layout/chunksize/ndisks
1580 * The last can require a reshape. It is different on different
1581 * levels so we need to check the level before actioning it.
1582 * Some times the level change needs to be requested after the
1583 * reshape (e.g. raid6->raid5, raid5->raid0)
1586 struct mdu_array_info_s array
;
1588 struct supertype
*st
;
1589 char *subarray
= NULL
;
1593 char *container
= NULL
;
1596 struct mddev_dev
*dv
;
1602 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) < 0) {
1603 pr_err("%s is not an active md array - aborting\n",
1607 if (data_offset
!= INVALID_SECTORS
&& array
.level
!= 10
1608 && (array
.level
< 4 || array
.level
> 6)) {
1609 pr_err("--grow --data-offset not yet supported\n");
1614 (s
->chunk
|| s
->level
!= UnSet
|| s
->layout_str
|| s
->raiddisks
)) {
1615 pr_err("cannot change component size at the same time as other changes.\n"
1616 " Change size first, then check data is intact before making other changes.\n");
1620 if (s
->raiddisks
&& s
->raiddisks
< array
.raid_disks
&& array
.level
> 1 &&
1621 get_linux_version() < 2006032 &&
1622 !check_env("MDADM_FORCE_FEWER")) {
1623 pr_err("reducing the number of devices is not safe before Linux 2.6.32\n"
1624 " Please use a newer kernel\n");
1628 st
= super_by_fd(fd
, &subarray
);
1630 pr_err("Unable to determine metadata format for %s\n", devname
);
1633 if (s
->raiddisks
> st
->max_devs
) {
1634 pr_err("Cannot increase raid-disks on this array beyond %d\n", st
->max_devs
);
1637 if (s
->level
== 0 &&
1638 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)) &&
1639 !(array
.state
& (1<<MD_SB_CLUSTERED
))) {
1640 array
.state
&= ~(1<<MD_SB_BITMAP_PRESENT
);
1641 if (ioctl(fd
, SET_ARRAY_INFO
, &array
)!= 0) {
1642 pr_err("failed to remove internal bitmap.\n");
1647 /* in the external case we need to check that the requested reshape is
1648 * supported, and perform an initial check that the container holds the
1649 * pre-requisite spare devices (mdmon owns final validation)
1651 if (st
->ss
->external
) {
1655 container
= st
->container_devnm
;
1656 cfd
= open_dev_excl(st
->container_devnm
);
1658 container
= st
->devnm
;
1660 cfd
= open_dev_excl(st
->devnm
);
1664 pr_err("Unable to open container for %s\n",
1670 rv
= st
->ss
->load_container(st
, cfd
, NULL
);
1673 pr_err("Cannot read superblock for %s\n",
1679 /* check if operation is supported for metadata handler */
1680 if (st
->ss
->container_content
) {
1681 struct mdinfo
*cc
= NULL
;
1682 struct mdinfo
*content
= NULL
;
1684 cc
= st
->ss
->container_content(st
, subarray
);
1685 for (content
= cc
; content
; content
= content
->next
) {
1686 int allow_reshape
= 1;
1688 /* check if reshape is allowed based on metadata
1689 * indications stored in content.array.status
1691 if (content
->array
.state
& (1<<MD_SB_BLOCK_VOLUME
))
1693 if (content
->array
.state
1694 & (1<<MD_SB_BLOCK_CONTAINER_RESHAPE
))
1696 if (!allow_reshape
) {
1697 pr_err("cannot reshape arrays in container with unsupported metadata: %s(%s)\n",
1698 devname
, container
);
1706 if (mdmon_running(container
))
1707 st
->update_tail
= &st
->updates
;
1711 for (dv
= devlist
; dv
; dv
= dv
->next
)
1713 if (s
->raiddisks
> array
.raid_disks
&&
1714 array
.spare_disks
+added_disks
< (s
->raiddisks
- array
.raid_disks
) &&
1716 pr_err("Need %d spare%s to avoid degraded array, and only have %d.\n"
1717 " Use --force to over-ride this check.\n",
1718 s
->raiddisks
- array
.raid_disks
,
1719 s
->raiddisks
- array
.raid_disks
== 1 ? "" : "s",
1720 array
.spare_disks
+ added_disks
);
1724 sra
= sysfs_read(fd
, NULL
, GET_LEVEL
| GET_DISKS
| GET_DEVS
1725 | GET_STATE
| GET_VERSION
);
1727 if (st
->ss
->external
&& subarray
== NULL
) {
1728 array
.level
= LEVEL_CONTAINER
;
1729 sra
->array
.level
= LEVEL_CONTAINER
;
1732 pr_err("failed to read sysfs parameters for %s\n",
1736 frozen
= freeze(st
);
1738 /* freeze() already spewed the reason */
1741 } else if (frozen
< 0) {
1742 pr_err("%s is performing resync/recovery and cannot be reshaped\n", devname
);
1747 /* ========= set size =============== */
1748 if (s
->size
> 0 && (s
->size
== MAX_SIZE
|| s
->size
!= (unsigned)array
.size
)) {
1749 unsigned long long orig_size
= get_component_size(fd
)/2;
1750 unsigned long long min_csize
;
1752 int raid0_takeover
= 0;
1755 orig_size
= (unsigned) array
.size
;
1757 if (orig_size
== 0) {
1758 pr_err("Cannot set device size in this type of array.\n");
1763 if (reshape_super(st
, s
->size
, UnSet
, UnSet
, 0, 0, UnSet
, NULL
,
1764 devname
, APPLY_METADATA_CHANGES
, c
->verbose
> 0)) {
1769 if (st
->ss
->external
) {
1770 /* metadata can have size limitation
1771 * update size value according to metadata information
1773 struct mdinfo
*sizeinfo
=
1774 st
->ss
->container_content(st
, subarray
);
1776 unsigned long long new_size
=
1777 sizeinfo
->custom_array_size
/2;
1778 int data_disks
= get_data_disks(
1779 sizeinfo
->array
.level
,
1780 sizeinfo
->array
.layout
,
1781 sizeinfo
->array
.raid_disks
);
1782 new_size
/= data_disks
;
1783 dprintf("Metadata size correction from %llu to %llu (%llu)\n", orig_size
, new_size
,
1784 new_size
* data_disks
);
1786 sysfs_free(sizeinfo
);
1790 /* Update the size of each member device in case
1791 * they have been resized. This will never reduce
1792 * below the current used-size. The "size" attribute
1793 * understands '0' to mean 'max'.
1797 for (mdi
= sra
->devs
; mdi
; mdi
= mdi
->next
) {
1798 if (sysfs_set_num(sra
, mdi
, "size",
1799 s
->size
== MAX_SIZE
? 0 : s
->size
) < 0) {
1800 /* Probably kernel refusing to let us
1801 * reduce the size - not an error.
1805 if (array
.not_persistent
== 0 &&
1806 array
.major_version
== 0 &&
1807 get_linux_version() < 3001000) {
1808 /* Dangerous to allow size to exceed 2TB */
1809 unsigned long long csize
;
1810 if (sysfs_get_ll(sra
, mdi
, "size", &csize
) == 0) {
1811 if (csize
>= 2ULL*1024*1024*1024)
1812 csize
= 2ULL*1024*1024*1024;
1813 if ((min_csize
== 0 || (min_csize
1820 pr_err("Cannot set size on array members.\n");
1821 goto size_change_error
;
1823 if (min_csize
&& s
->size
> min_csize
) {
1824 pr_err("Cannot safely make this array use more than 2TB per device on this kernel.\n");
1826 goto size_change_error
;
1828 if (min_csize
&& s
->size
== MAX_SIZE
) {
1829 /* Don't let the kernel choose a size - it will get
1832 pr_err("Limited v0.90 array to 2TB per device\n");
1833 s
->size
= min_csize
;
1835 if (st
->ss
->external
) {
1836 if (sra
->array
.level
== 0) {
1837 rv
= sysfs_set_str(sra
, NULL
, "level",
1841 /* get array parameters after takeover
1842 * to change one parameter at time only
1844 rv
= ioctl(fd
, GET_ARRAY_INFO
, &array
);
1847 /* make sure mdmon is
1848 * aware of the new level */
1849 if (!mdmon_running(st
->container_devnm
))
1850 start_mdmon(st
->container_devnm
);
1851 ping_monitor(container
);
1852 if (mdmon_running(st
->container_devnm
) &&
1853 st
->update_tail
== NULL
)
1854 st
->update_tail
= &st
->updates
;
1857 if (s
->size
== MAX_SIZE
)
1859 array
.size
= s
->size
;
1860 if (s
->size
& ~INT32_MAX
) {
1861 /* got truncated to 32bit, write to
1862 * component_size instead
1865 rv
= sysfs_set_num(sra
, NULL
,
1866 "component_size", s
->size
);
1870 rv
= ioctl(fd
, SET_ARRAY_INFO
, &array
);
1872 /* manage array size when it is managed externally
1874 if ((rv
== 0) && st
->ss
->external
)
1875 rv
= set_array_size(st
, sra
, sra
->text_version
);
1878 if (raid0_takeover
) {
1879 /* do not recync non-existing parity,
1880 * we will drop it anyway
1882 sysfs_set_str(sra
, NULL
, "sync_action", "frozen");
1883 /* go back to raid0, drop parity disk
1885 sysfs_set_str(sra
, NULL
, "level", "raid0");
1886 ioctl(fd
, GET_ARRAY_INFO
, &array
);
1893 /* restore metadata */
1894 if (reshape_super(st
, orig_size
, UnSet
, UnSet
, 0, 0,
1895 UnSet
, NULL
, devname
,
1896 ROLLBACK_METADATA_CHANGES
,
1899 pr_err("Cannot set device size for %s: %s\n",
1900 devname
, strerror(err
));
1902 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
1903 cont_err("Bitmap must be removed before size can be changed\n");
1907 if (s
->assume_clean
) {
1908 /* This will fail on kernels older than 3.0 unless
1909 * a backport has been arranged.
1912 sysfs_set_str(sra
, NULL
, "resync_start", "none") < 0)
1913 pr_err("--assume-clean not supported with --grow on this kernel\n");
1915 ioctl(fd
, GET_ARRAY_INFO
, &array
);
1916 s
->size
= get_component_size(fd
)/2;
1918 s
->size
= array
.size
;
1919 if (c
->verbose
>= 0) {
1920 if (s
->size
== orig_size
)
1921 pr_err("component size of %s unchanged at %lluK\n",
1924 pr_err("component size of %s has been set to %lluK\n",
1928 } else if (array
.level
!= LEVEL_CONTAINER
) {
1929 s
->size
= get_component_size(fd
)/2;
1931 s
->size
= array
.size
;
1934 /* See if there is anything else to do */
1935 if ((s
->level
== UnSet
|| s
->level
== array
.level
) &&
1936 (s
->layout_str
== NULL
) &&
1937 (s
->chunk
== 0 || s
->chunk
== array
.chunk_size
) &&
1938 data_offset
== INVALID_SECTORS
&&
1939 (s
->raiddisks
== 0 || s
->raiddisks
== array
.raid_disks
)) {
1940 /* Nothing more to do */
1941 if (!changed
&& c
->verbose
>= 0)
1942 pr_err("%s: no change requested\n",
1947 /* ========= check for Raid10/Raid1 -> Raid0 conversion ===============
1948 * current implementation assumes that following conditions must be met:
1951 * - near_copies == 2
1953 if ((s
->level
== 0 && array
.level
== 10 && sra
&&
1954 array
.layout
== ((1 << 8) + 2) && !(array
.raid_disks
& 1)) ||
1955 (s
->level
== 0 && array
.level
== 1 && sra
)) {
1957 err
= remove_disks_for_takeover(st
, sra
, array
.layout
);
1959 dprintf("Array cannot be reshaped\n");
1965 /* Make sure mdmon has seen the device removal
1966 * and updated metadata before we continue with
1970 ping_monitor(container
);
1973 memset(&info
, 0, sizeof(info
));
1975 sysfs_init(&info
, fd
, NULL
);
1976 strcpy(info
.text_version
, sra
->text_version
);
1977 info
.component_size
= s
->size
*2;
1978 info
.new_level
= s
->level
;
1979 info
.new_chunk
= s
->chunk
* 1024;
1980 if (info
.array
.level
== LEVEL_CONTAINER
) {
1981 info
.delta_disks
= UnSet
;
1982 info
.array
.raid_disks
= s
->raiddisks
;
1983 } else if (s
->raiddisks
)
1984 info
.delta_disks
= s
->raiddisks
- info
.array
.raid_disks
;
1986 info
.delta_disks
= UnSet
;
1987 if (s
->layout_str
== NULL
) {
1988 info
.new_layout
= UnSet
;
1989 if (info
.array
.level
== 6 &&
1990 (info
.new_level
== 6 || info
.new_level
== UnSet
) &&
1991 info
.array
.layout
>= 16) {
1992 pr_err("%s has a non-standard layout. If you wish to preserve this\n", devname
);
1993 cont_err("during the reshape, please specify --layout=preserve\n");
1994 cont_err("If you want to change it, specify a layout or use --layout=normalise\n");
1998 } else if (strcmp(s
->layout_str
, "normalise") == 0 ||
1999 strcmp(s
->layout_str
, "normalize") == 0) {
2000 /* If we have a -6 RAID6 layout, remove the '-6'. */
2001 info
.new_layout
= UnSet
;
2002 if (info
.array
.level
== 6 && info
.new_level
== UnSet
) {
2004 strcpy(l
, map_num(r6layout
, info
.array
.layout
));
2005 h
= strrchr(l
, '-');
2006 if (h
&& strcmp(h
, "-6") == 0) {
2008 info
.new_layout
= map_name(r6layout
, l
);
2011 pr_err("%s is only meaningful when reshaping a RAID6 array.\n", s
->layout_str
);
2015 } else if (strcmp(s
->layout_str
, "preserve") == 0) {
2016 /* This means that a non-standard RAID6 layout
2019 * - When reshape a RAID6 (e.g. adding a device)
2020 * which is in a non-standard layout, it is OK
2021 * to preserve that layout.
2022 * - When converting a RAID5 to RAID6, leave it in
2023 * the XXX-6 layout, don't re-layout.
2025 if (info
.array
.level
== 6 && info
.new_level
== UnSet
)
2026 info
.new_layout
= info
.array
.layout
;
2027 else if (info
.array
.level
== 5 && info
.new_level
== 6) {
2029 strcpy(l
, map_num(r5layout
, info
.array
.layout
));
2031 info
.new_layout
= map_name(r6layout
, l
);
2033 pr_err("%s in only meaningful when reshaping to RAID6\n", s
->layout_str
);
2038 int l
= info
.new_level
;
2040 l
= info
.array
.level
;
2043 info
.new_layout
= map_name(r5layout
, s
->layout_str
);
2046 info
.new_layout
= map_name(r6layout
, s
->layout_str
);
2049 info
.new_layout
= parse_layout_10(s
->layout_str
);
2052 info
.new_layout
= parse_layout_faulty(s
->layout_str
);
2055 pr_err("layout not meaningful with this level\n");
2059 if (info
.new_layout
== UnSet
) {
2060 pr_err("layout %s not understood for this level\n",
2067 if (array
.level
== LEVEL_FAULTY
) {
2068 if (s
->level
!= UnSet
&& s
->level
!= array
.level
) {
2069 pr_err("cannot change level of Faulty device\n");
2073 pr_err("cannot set chunksize of Faulty device\n");
2076 if (s
->raiddisks
&& s
->raiddisks
!= 1) {
2077 pr_err("cannot set raid_disks of Faulty device\n");
2080 if (s
->layout_str
) {
2081 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) != 0) {
2082 dprintf("Cannot get array information.\n");
2085 array
.layout
= info
.new_layout
;
2086 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
2087 pr_err("failed to set new layout\n");
2089 } else if (c
->verbose
>= 0)
2090 printf("layout for %s set to %d\n",
2091 devname
, array
.layout
);
2093 } else if (array
.level
== LEVEL_CONTAINER
) {
2094 /* This change is to be applied to every array in the
2095 * container. This is only needed when the metadata imposes
2096 * restraints of the various arrays in the container.
2097 * Currently we only know that IMSM requires all arrays
2098 * to have the same number of devices so changing the
2099 * number of devices (On-Line Capacity Expansion) must be
2100 * performed at the level of the container
2106 rv
= reshape_container(container
, devname
, -1, st
, &info
,
2107 c
->force
, c
->backup_file
, c
->verbose
, 0, 0, 0);
2110 /* get spare devices from external metadata
2112 if (st
->ss
->external
) {
2113 struct mdinfo
*info2
;
2115 info2
= st
->ss
->container_content(st
, subarray
);
2117 info
.array
.spare_disks
=
2118 info2
->array
.spare_disks
;
2123 /* Impose these changes on a single array. First
2124 * check that the metadata is OK with the change. */
2126 if (reshape_super(st
, 0, info
.new_level
,
2127 info
.new_layout
, info
.new_chunk
,
2128 info
.array
.raid_disks
, info
.delta_disks
,
2129 c
->backup_file
, devname
, APPLY_METADATA_CHANGES
,
2135 rv
= reshape_array(container
, fd
, devname
, st
, &info
, c
->force
,
2136 devlist
, data_offset
, c
->backup_file
, c
->verbose
,
2147 /* verify_reshape_position()
2148 * Function checks if reshape position in metadata is not farther
2149 * than position in md.
2151 * 0 : not valid sysfs entry
2152 * it can be caused by not started reshape, it should be started
2153 * by reshape array or raid0 array is before takeover
2154 * -1 : error, reshape position is obviously wrong
2155 * 1 : success, reshape progress correct or updated
2157 static int verify_reshape_position(struct mdinfo
*info
, int level
)
2163 /* read sync_max, failure can mean raid0 array */
2164 rv
= sysfs_get_str(info
, NULL
, "sync_max", buf
, 40);
2168 unsigned long long position
= strtoull(buf
, &ep
, 0);
2170 dprintf("Read sync_max sysfs entry is: %s\n", buf
);
2171 if (!(ep
== buf
|| (*ep
!= 0 && *ep
!= '\n' && *ep
!= ' '))) {
2172 position
*= get_data_disks(level
,
2174 info
->array
.raid_disks
);
2175 if (info
->reshape_progress
< position
) {
2176 dprintf("Corrected reshape progress (%llu) to md position (%llu)\n",
2177 info
->reshape_progress
, position
);
2178 info
->reshape_progress
= position
;
2180 } else if (info
->reshape_progress
> position
) {
2181 pr_err("Fatal error: array reshape was not properly frozen (expected reshape position is %llu, but reshape progress is %llu.\n",
2182 position
, info
->reshape_progress
);
2185 dprintf("Reshape position in md and metadata are the same;");
2189 } else if (rv
== 0) {
2190 /* for valid sysfs entry, 0-length content
2191 * should be indicated as error
2199 static unsigned long long choose_offset(unsigned long long lo
,
2200 unsigned long long hi
,
2201 unsigned long long min
,
2202 unsigned long long max
)
2204 /* Choose a new offset between hi and lo.
2205 * It must be between min and max, but
2206 * we would prefer something near the middle of hi/lo, and also
2207 * prefer to be aligned to a big power of 2.
2209 * So we start with the middle, then for each bit,
2210 * starting at '1' and increasing, if it is set, we either
2211 * add it or subtract it if possible, preferring the option
2212 * which is furthest from the boundary.
2214 * We stop once we get a 1MB alignment. As units are in sectors,
2215 * 1MB = 2*1024 sectors.
2217 unsigned long long choice
= (lo
+ hi
) / 2;
2218 unsigned long long bit
= 1;
2220 for (bit
= 1; bit
< 2*1024; bit
= bit
<< 1) {
2221 unsigned long long bigger
, smaller
;
2222 if (! (bit
& choice
))
2224 bigger
= choice
+ bit
;
2225 smaller
= choice
- bit
;
2226 if (bigger
> max
&& smaller
< min
)
2230 else if (smaller
< min
)
2232 else if (hi
- bigger
> smaller
- lo
)
2240 static int set_new_data_offset(struct mdinfo
*sra
, struct supertype
*st
,
2241 char *devname
, int delta_disks
,
2242 unsigned long long data_offset
,
2243 unsigned long long min
,
2249 unsigned long long before
, after
;
2251 /* Need to find min space before and after so same is used
2254 before
= UINT64_MAX
;
2256 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
2260 struct supertype
*st2
;
2261 struct mdinfo info2
;
2263 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
2265 dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 0);
2266 dfd
= dev_open(dn
, O_RDONLY
);
2268 pr_err("%s: cannot open component %s\n",
2269 devname
, dn
? dn
: "-unknown-");
2272 st2
= dup_super(st
);
2273 rv
= st2
->ss
->load_super(st2
,dfd
, NULL
);
2277 pr_err("%s: cannot get superblock from %s\n",
2281 st2
->ss
->getinfo_super(st2
, &info2
, NULL
);
2282 st2
->ss
->free_super(st2
);
2284 if (info2
.space_before
== 0 &&
2285 info2
.space_after
== 0) {
2286 /* Metadata doesn't support data_offset changes */
2288 pr_err("%s: Metadata version doesn't support data_offset changes\n",
2292 if (before
> info2
.space_before
)
2293 before
= info2
.space_before
;
2294 if (after
> info2
.space_after
)
2295 after
= info2
.space_after
;
2297 if (data_offset
!= INVALID_SECTORS
) {
2299 if (info2
.data_offset
== data_offset
) {
2300 pr_err("%s: already has that data_offset\n",
2304 if (data_offset
< info2
.data_offset
)
2308 } else if ((data_offset
<= info2
.data_offset
&& dir
== 1) ||
2309 (data_offset
>= info2
.data_offset
&& dir
== -1)) {
2310 pr_err("%s: differing data offsets on devices make this --data-offset setting impossible\n",
2316 if (before
== UINT64_MAX
)
2317 /* impossible really, there must be no devices */
2320 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
2321 char *dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 0);
2322 unsigned long long new_data_offset
;
2324 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
2326 if (delta_disks
< 0) {
2327 /* Don't need any space as array is shrinking
2328 * just move data_offset up by min
2330 if (data_offset
== INVALID_SECTORS
)
2331 new_data_offset
= sd
->data_offset
+ min
;
2333 if (data_offset
< sd
->data_offset
+ min
) {
2334 pr_err("--data-offset too small for %s\n",
2338 new_data_offset
= data_offset
;
2340 } else if (delta_disks
> 0) {
2341 /* need space before */
2345 pr_err("Insufficient head-space for reshape on %s\n",
2349 if (data_offset
== INVALID_SECTORS
)
2350 new_data_offset
= sd
->data_offset
- min
;
2352 if (data_offset
> sd
->data_offset
- min
) {
2353 pr_err("--data-offset too large for %s\n",
2357 new_data_offset
= data_offset
;
2361 /* can move up or down. If 'data_offset'
2362 * was set we would have already decided,
2363 * so just choose direction with most space.
2370 sysfs_set_str(sra
, NULL
, "reshape_direction",
2371 dir
== 1 ? "backwards" : "forwards");
2373 /* Increase data offset */
2377 pr_err("Insufficient tail-space for reshape on %s\n",
2381 if (data_offset
!= INVALID_SECTORS
&&
2382 data_offset
< sd
->data_offset
+ min
) {
2383 pr_err("--data-offset too small on %s\n",
2387 if (data_offset
!= INVALID_SECTORS
)
2388 new_data_offset
= data_offset
;
2390 new_data_offset
= choose_offset(sd
->data_offset
,
2391 sd
->data_offset
+ after
,
2392 sd
->data_offset
+ min
,
2393 sd
->data_offset
+ after
);
2395 /* Decrease data offset */
2399 pr_err("insufficient head-room on %s\n",
2403 if (data_offset
!= INVALID_SECTORS
&&
2404 data_offset
< sd
->data_offset
- min
) {
2405 pr_err("--data-offset too small on %s\n",
2409 if (data_offset
!= INVALID_SECTORS
)
2410 new_data_offset
= data_offset
;
2412 new_data_offset
= choose_offset(sd
->data_offset
- before
,
2414 sd
->data_offset
- before
,
2415 sd
->data_offset
- min
);
2418 err
= sysfs_set_num(sra
, sd
, "new_offset", new_data_offset
);
2419 if (err
< 0 && errno
== E2BIG
) {
2420 /* try again after increasing data size to max */
2421 err
= sysfs_set_num(sra
, sd
, "size", 0);
2422 if (err
< 0 && errno
== EINVAL
&&
2423 !(sd
->disk
.state
& (1<<MD_DISK_SYNC
))) {
2424 /* some kernels have a bug where you cannot
2425 * use '0' on spare devices. */
2426 sysfs_set_num(sra
, sd
, "size",
2427 (sra
->component_size
+ after
)/2);
2429 err
= sysfs_set_num(sra
, sd
, "new_offset",
2433 if (errno
== E2BIG
&& data_offset
!= INVALID_SECTORS
) {
2434 pr_err("data-offset is too big for %s\n",
2438 if (sd
== sra
->devs
&&
2439 (errno
== ENOENT
|| errno
== E2BIG
))
2440 /* Early kernel, no 'new_offset' file,
2441 * or kernel doesn't like us.
2442 * For RAID5/6 this is not fatal
2445 pr_err("Cannot set new_offset for %s\n",
2454 /* Just use a backup file */
2458 static int raid10_reshape(char *container
, int fd
, char *devname
,
2459 struct supertype
*st
, struct mdinfo
*info
,
2460 struct reshape
*reshape
,
2461 unsigned long long data_offset
,
2462 int force
, int verbose
)
2464 /* Changing raid_disks, layout, chunksize or possibly
2465 * just data_offset for a RAID10.
2466 * We must always change data_offset. We change by at least
2467 * ->min_offset_change which is the largest of the old and new
2469 * If raid_disks is increasing, then data_offset must decrease
2470 * by at least this copy size.
2471 * If raid_disks is unchanged, data_offset must increase or
2472 * decrease by at least min_offset_change but preferably by much more.
2473 * We choose half of the available space.
2474 * If raid_disks is decreasing, data_offset must increase by
2475 * at least min_offset_change. To allow of this, component_size
2476 * must be decreased by the same amount.
2478 * So we calculate the required minimum and direction, possibly
2479 * reduce the component_size, then iterate through the devices
2480 * and set the new_data_offset.
2481 * If that all works, we set chunk_size, layout, raid_disks, and start
2485 unsigned long long min
;
2488 sra
= sysfs_read(fd
, NULL
,
2489 GET_COMPONENT
|GET_DEVS
|GET_OFFSET
|GET_STATE
|GET_CHUNK
2492 pr_err("%s: Cannot get array details from sysfs\n",
2496 min
= reshape
->min_offset_change
;
2498 if (info
->delta_disks
)
2499 sysfs_set_str(sra
, NULL
, "reshape_direction",
2500 info
->delta_disks
< 0 ? "backwards" : "forwards");
2501 if (info
->delta_disks
< 0 &&
2502 info
->space_after
< min
) {
2503 int rv
= sysfs_set_num(sra
, NULL
, "component_size",
2504 (sra
->component_size
-
2507 pr_err("cannot reduce component size\n");
2511 err
= set_new_data_offset(sra
, st
, devname
, info
->delta_disks
, data_offset
,
2514 pr_err("Cannot set new_data_offset: RAID10 reshape not\n");
2515 cont_err("supported on this kernel\n");
2521 if (!err
&& sysfs_set_num(sra
, NULL
, "chunk_size", info
->new_chunk
) < 0)
2523 if (!err
&& sysfs_set_num(sra
, NULL
, "layout", reshape
->after
.layout
) < 0)
2525 if (!err
&& sysfs_set_num(sra
, NULL
, "raid_disks",
2526 info
->array
.raid_disks
+ info
->delta_disks
) < 0)
2528 if (!err
&& sysfs_set_str(sra
, NULL
, "sync_action", "reshape") < 0)
2531 pr_err("Cannot set array shape for %s\n",
2534 (info
->array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2535 cont_err(" Bitmap must be removed before shape can be changed\n");
2545 static void get_space_after(int fd
, struct supertype
*st
, struct mdinfo
*info
)
2547 struct mdinfo
*sra
, *sd
;
2548 /* Initialisation to silence compiler warning */
2549 unsigned long long min_space_before
= 0, min_space_after
= 0;
2552 sra
= sysfs_read(fd
, NULL
, GET_DEVS
);
2555 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
2558 struct supertype
*st2
;
2559 struct mdinfo info2
;
2561 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
2563 dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 0);
2564 dfd
= dev_open(dn
, O_RDONLY
);
2567 st2
= dup_super(st
);
2568 if (st2
->ss
->load_super(st2
,dfd
, NULL
)) {
2574 st2
->ss
->getinfo_super(st2
, &info2
, NULL
);
2575 st2
->ss
->free_super(st2
);
2578 min_space_before
> info2
.space_before
)
2579 min_space_before
= info2
.space_before
;
2581 min_space_after
> info2
.space_after
)
2582 min_space_after
= info2
.space_after
;
2585 if (sd
== NULL
&& !first
) {
2586 info
->space_after
= min_space_after
;
2587 info
->space_before
= min_space_before
;
2592 static void update_cache_size(char *container
, struct mdinfo
*sra
,
2593 struct mdinfo
*info
,
2594 int disks
, unsigned long long blocks
)
2596 /* Check that the internal stripe cache is
2597 * large enough, or it won't work.
2598 * It must hold at least 4 stripes of the larger
2601 unsigned long cache
;
2602 cache
= max(info
->array
.chunk_size
, info
->new_chunk
);
2603 cache
*= 4; /* 4 stripes minimum */
2604 cache
/= 512; /* convert to sectors */
2605 /* make sure there is room for 'blocks' with a bit to spare */
2606 if (cache
< 16 + blocks
/ disks
)
2607 cache
= 16 + blocks
/ disks
;
2608 cache
/= (4096/512); /* Convert from sectors to pages */
2610 if (sra
->cache_size
< cache
)
2611 subarray_set_num(container
, sra
, "stripe_cache_size",
2615 static int impose_reshape(struct mdinfo
*sra
,
2616 struct mdinfo
*info
,
2617 struct supertype
*st
,
2620 char *devname
, char *container
,
2621 struct reshape
*reshape
)
2623 struct mdu_array_info_s array
;
2625 sra
->new_chunk
= info
->new_chunk
;
2628 /* for external metadata checkpoint saved by mdmon can be lost
2629 * or missed /due to e.g. crash/. Check if md is not during
2630 * restart farther than metadata points to.
2631 * If so, this means metadata information is obsolete.
2633 if (st
->ss
->external
)
2634 verify_reshape_position(info
, reshape
->level
);
2635 sra
->reshape_progress
= info
->reshape_progress
;
2637 sra
->reshape_progress
= 0;
2638 if (reshape
->after
.data_disks
< reshape
->before
.data_disks
)
2639 /* start from the end of the new array */
2640 sra
->reshape_progress
= (sra
->component_size
2641 * reshape
->after
.data_disks
);
2644 ioctl(fd
, GET_ARRAY_INFO
, &array
);
2645 if (info
->array
.chunk_size
== info
->new_chunk
&&
2646 reshape
->before
.layout
== reshape
->after
.layout
&&
2647 st
->ss
->external
== 0) {
2648 /* use SET_ARRAY_INFO but only if reshape hasn't started */
2649 array
.raid_disks
= reshape
->after
.data_disks
+ reshape
->parity
;
2651 ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
2654 pr_err("Cannot set device shape for %s: %s\n",
2655 devname
, strerror(errno
));
2658 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2659 cont_err("Bitmap must be removed before shape can be changed\n");
2663 } else if (!restart
) {
2664 /* set them all just in case some old 'new_*' value
2665 * persists from some earlier problem.
2668 if (sysfs_set_num(sra
, NULL
, "chunk_size", info
->new_chunk
) < 0)
2670 if (!err
&& sysfs_set_num(sra
, NULL
, "layout",
2671 reshape
->after
.layout
) < 0)
2673 if (!err
&& subarray_set_num(container
, sra
, "raid_disks",
2674 reshape
->after
.data_disks
+
2675 reshape
->parity
) < 0)
2678 pr_err("Cannot set device shape for %s\n",
2682 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2683 cont_err("Bitmap must be removed before shape can be changed\n");
2692 static int impose_level(int fd
, int level
, char *devname
, int verbose
)
2695 struct mdu_array_info_s array
;
2697 sysfs_init(&info
, fd
, NULL
);
2699 ioctl(fd
, GET_ARRAY_INFO
, &array
);
2701 (array
.level
>= 4 && array
.level
<= 6)) {
2702 /* To convert to RAID0 we need to fail and
2703 * remove any non-data devices. */
2706 int data_disks
= array
.raid_disks
- 1;
2707 if (array
.level
== 6)
2709 if (array
.level
== 5 &&
2710 array
.layout
!= ALGORITHM_PARITY_N
)
2712 if (array
.level
== 6 &&
2713 array
.layout
!= ALGORITHM_PARITY_N_6
)
2715 sysfs_set_str(&info
, NULL
,"sync_action", "idle");
2716 /* First remove any spares so no recovery starts */
2717 for (d
= 0, found
= 0;
2718 d
< MAX_DISKS
&& found
< array
.nr_disks
;
2720 mdu_disk_info_t disk
;
2722 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
2724 if (disk
.major
== 0 && disk
.minor
== 0)
2727 if ((disk
.state
& (1 << MD_DISK_ACTIVE
))
2728 && disk
.raid_disk
< data_disks
)
2731 ioctl(fd
, HOT_REMOVE_DISK
,
2732 makedev(disk
.major
, disk
.minor
));
2734 /* Now fail anything left */
2735 ioctl(fd
, GET_ARRAY_INFO
, &array
);
2736 for (d
= 0, found
= 0;
2737 d
< MAX_DISKS
&& found
< array
.nr_disks
;
2740 mdu_disk_info_t disk
;
2742 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
2744 if (disk
.major
== 0 && disk
.minor
== 0)
2747 if ((disk
.state
& (1 << MD_DISK_ACTIVE
))
2748 && disk
.raid_disk
< data_disks
)
2751 ioctl(fd
, SET_DISK_FAULTY
,
2752 makedev(disk
.major
, disk
.minor
));
2754 while (ioctl(fd
, HOT_REMOVE_DISK
,
2755 makedev(disk
.major
, disk
.minor
)) < 0
2762 c
= map_num(pers
, level
);
2764 int err
= sysfs_set_str(&info
, NULL
, "level", c
);
2767 pr_err("%s: could not set level to %s\n",
2770 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2771 cont_err("Bitmap must be removed before level can be changed\n");
2775 pr_err("level of %s changed to %s\n",
2782 static void catch_term(int sig
)
2787 static int continue_via_systemd(char *devnm
)
2789 int skipped
, i
, pid
, status
;
2791 /* In a systemd/udev world, it is best to get systemd to
2792 * run "mdadm --grow --continue" rather than running in the
2797 /* FIXME yuk. CLOSE_EXEC?? */
2799 for (i
= 3; skipped
< 20; i
++)
2805 /* Don't want to see error messages from
2806 * systemctl. If the service doesn't exist,
2807 * we fork ourselves.
2810 open("/dev/null", O_WRONLY
);
2811 snprintf(pathbuf
, sizeof(pathbuf
), "mdadm-grow-continue@%s.service",
2813 status
= execl("/usr/bin/systemctl", "systemctl",
2816 status
= execl("/bin/systemctl", "systemctl", "start",
2819 case -1: /* Just do it ourselves. */
2821 default: /* parent - good */
2822 pid
= wait(&status
);
2823 if (pid
>= 0 && status
== 0)
2829 static int reshape_array(char *container
, int fd
, char *devname
,
2830 struct supertype
*st
, struct mdinfo
*info
,
2831 int force
, struct mddev_dev
*devlist
,
2832 unsigned long long data_offset
,
2833 char *backup_file
, int verbose
, int forked
,
2834 int restart
, int freeze_reshape
)
2836 struct reshape reshape
;
2839 int orig_level
= UnSet
;
2843 struct mdu_array_info_s array
;
2846 struct mddev_dev
*dv
;
2850 unsigned long long *offsets
= NULL
;
2854 unsigned long blocks
;
2855 unsigned long long array_size
;
2857 struct mdinfo
*sra
= NULL
;
2860 /* when reshaping a RAID0, the component_size might be zero.
2861 * So try to fix that up.
2863 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) != 0) {
2864 dprintf("Cannot get array information.\n");
2867 if (array
.level
== 0 && info
->component_size
== 0) {
2868 get_dev_size(fd
, NULL
, &array_size
);
2869 info
->component_size
= array_size
/ array
.raid_disks
;
2872 if (array
.level
== 10)
2873 /* Need space_after info */
2874 get_space_after(fd
, st
, info
);
2876 if (info
->reshape_active
) {
2877 int new_level
= info
->new_level
;
2878 info
->new_level
= UnSet
;
2879 if (info
->delta_disks
> 0)
2880 info
->array
.raid_disks
-= info
->delta_disks
;
2881 msg
= analyse_change(devname
, info
, &reshape
);
2882 info
->new_level
= new_level
;
2883 if (info
->delta_disks
> 0)
2884 info
->array
.raid_disks
+= info
->delta_disks
;
2886 /* Make sure the array isn't read-only */
2887 ioctl(fd
, RESTART_ARRAY_RW
, 0);
2889 msg
= analyse_change(devname
, info
, &reshape
);
2891 /* if msg == "", error has already been printed */
2893 pr_err("%s\n", msg
);
2897 (reshape
.level
!= info
->array
.level
||
2898 reshape
.before
.layout
!= info
->array
.layout
||
2899 reshape
.before
.data_disks
+ reshape
.parity
2900 != info
->array
.raid_disks
- max(0, info
->delta_disks
))) {
2901 pr_err("reshape info is not in native format - cannot continue.\n");
2905 if (st
->ss
->external
&& restart
&& (info
->reshape_progress
== 0) &&
2906 !((sysfs_get_str(info
, NULL
, "sync_action", buf
, sizeof(buf
)) > 0) &&
2907 (strncmp(buf
, "reshape", 7) == 0))) {
2908 /* When reshape is restarted from '0', very begin of array
2909 * it is possible that for external metadata reshape and array
2910 * configuration doesn't happen.
2911 * Check if md has the same opinion, and reshape is restarted
2912 * from 0. If so, this is regular reshape start after reshape
2913 * switch in metadata to next array only.
2915 if ((verify_reshape_position(info
, reshape
.level
) >= 0) &&
2916 (info
->reshape_progress
== 0))
2920 /* reshape already started. just skip to monitoring the reshape */
2921 if (reshape
.backup_blocks
== 0)
2923 if (restart
& RESHAPE_NO_BACKUP
)
2926 /* Need 'sra' down at 'started:' */
2927 sra
= sysfs_read(fd
, NULL
,
2928 GET_COMPONENT
|GET_DEVS
|GET_OFFSET
|GET_STATE
|GET_CHUNK
|
2931 pr_err("%s: Cannot get array details from sysfs\n",
2937 backup_file
= locate_backup(sra
->sys_name
);
2941 /* The container is frozen but the array may not be.
2942 * So freeze the array so spares don't get put to the wrong use
2943 * FIXME there should probably be a cleaner separation between
2944 * freeze_array and freeze_container.
2946 sysfs_freeze_array(info
);
2947 /* Check we have enough spares to not be degraded */
2949 for (dv
= devlist
; dv
; dv
=dv
->next
)
2951 spares_needed
= max(reshape
.before
.data_disks
,
2952 reshape
.after
.data_disks
)
2953 + reshape
.parity
- array
.raid_disks
;
2956 info
->new_level
> 1 && info
->array
.level
> 1 &&
2957 spares_needed
> info
->array
.spare_disks
+ added_disks
) {
2958 pr_err("Need %d spare%s to avoid degraded array, and only have %d.\n"
2959 " Use --force to over-ride this check.\n",
2961 spares_needed
== 1 ? "" : "s",
2962 info
->array
.spare_disks
+ added_disks
);
2965 /* Check we have enough spares to not fail */
2966 spares_needed
= max(reshape
.before
.data_disks
,
2967 reshape
.after
.data_disks
)
2969 if ((info
->new_level
> 1 || info
->new_level
== 0) &&
2970 spares_needed
> info
->array
.spare_disks
+added_disks
) {
2971 pr_err("Need %d spare%s to create working array, and only have %d.\n",
2973 spares_needed
== 1 ? "" : "s",
2974 info
->array
.spare_disks
+ added_disks
);
2978 if (reshape
.level
!= array
.level
) {
2979 int err
= impose_level(fd
, reshape
.level
, devname
, verbose
);
2982 info
->new_layout
= UnSet
; /* after level change,
2983 * layout is meaningless */
2984 orig_level
= array
.level
;
2985 sysfs_freeze_array(info
);
2987 if (reshape
.level
> 0 && st
->ss
->external
) {
2988 /* make sure mdmon is aware of the new level */
2989 if (mdmon_running(container
))
2990 flush_mdmon(container
);
2992 if (!mdmon_running(container
))
2993 start_mdmon(container
);
2994 ping_monitor(container
);
2995 if (mdmon_running(container
) &&
2996 st
->update_tail
== NULL
)
2997 st
->update_tail
= &st
->updates
;
3000 /* ->reshape_super might have chosen some spares from the
3001 * container that it wants to be part of the new array.
3002 * We can collect them with ->container_content and give
3003 * them to the kernel.
3005 if (st
->ss
->reshape_super
&& st
->ss
->container_content
) {
3006 char *subarray
= strchr(info
->text_version
+1, '/')+1;
3007 struct mdinfo
*info2
=
3008 st
->ss
->container_content(st
, subarray
);
3012 sysfs_init(info2
, fd
, st
->devnm
);
3013 /* When increasing number of devices, we need to set
3014 * new raid_disks before adding these, or they might
3017 if (reshape
.backup_blocks
&&
3018 reshape
.after
.data_disks
> reshape
.before
.data_disks
)
3019 subarray_set_num(container
, info2
, "raid_disks",
3020 reshape
.after
.data_disks
+
3022 for (d
= info2
->devs
; d
; d
= d
->next
) {
3023 if (d
->disk
.state
== 0 &&
3024 d
->disk
.raid_disk
>= 0) {
3025 /* This is a spare that wants to
3026 * be part of the array.
3028 add_disk(fd
, st
, info2
, d
);
3034 /* We might have been given some devices to add to the
3035 * array. Now that the array has been changed to the right
3036 * level and frozen, we can safely add them.
3039 if (Manage_subdevs(devname
, fd
, devlist
, verbose
,
3044 if (reshape
.backup_blocks
== 0 && data_offset
!= INVALID_SECTORS
)
3045 reshape
.backup_blocks
= reshape
.before
.data_disks
* info
->array
.chunk_size
/512;
3046 if (reshape
.backup_blocks
== 0) {
3047 /* No restriping needed, but we might need to impose
3048 * some more changes: layout, raid_disks, chunk_size
3050 /* read current array info */
3051 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) != 0) {
3052 dprintf("Cannot get array information.\n");
3055 /* compare current array info with new values and if
3056 * it is different update them to new */
3057 if (info
->new_layout
!= UnSet
&&
3058 info
->new_layout
!= array
.layout
) {
3059 array
.layout
= info
->new_layout
;
3060 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
3061 pr_err("failed to set new layout\n");
3063 } else if (verbose
>= 0)
3064 printf("layout for %s set to %d\n",
3065 devname
, array
.layout
);
3067 if (info
->delta_disks
!= UnSet
&&
3068 info
->delta_disks
!= 0 &&
3069 array
.raid_disks
!= (info
->array
.raid_disks
+ info
->delta_disks
)) {
3070 array
.raid_disks
+= info
->delta_disks
;
3071 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
3072 pr_err("failed to set raid disks\n");
3074 } else if (verbose
>= 0) {
3075 printf("raid_disks for %s set to %d\n",
3076 devname
, array
.raid_disks
);
3079 if (info
->new_chunk
!= 0 &&
3080 info
->new_chunk
!= array
.chunk_size
) {
3081 if (sysfs_set_num(info
, NULL
,
3082 "chunk_size", info
->new_chunk
) != 0) {
3083 pr_err("failed to set chunk size\n");
3085 } else if (verbose
>= 0)
3086 printf("chunk size for %s set to %d\n",
3087 devname
, array
.chunk_size
);
3094 * There are three possibilities.
3095 * 1/ The array will shrink.
3096 * We need to ensure the reshape will pause before reaching
3097 * the 'critical section'. We also need to fork and wait for
3098 * that to happen. When it does we
3099 * suspend/backup/complete/unfreeze
3101 * 2/ The array will not change size.
3102 * This requires that we keep a backup of a sliding window
3103 * so that we can restore data after a crash. So we need
3104 * to fork and monitor progress.
3105 * In future we will allow the data_offset to change, so
3106 * a sliding backup becomes unnecessary.
3108 * 3/ The array will grow. This is relatively easy.
3109 * However the kernel's restripe routines will cheerfully
3110 * overwrite some early data before it is safe. So we
3111 * need to make a backup of the early parts of the array
3112 * and be ready to restore it if rebuild aborts very early.
3113 * For externally managed metadata, we still need a forked
3114 * child to monitor the reshape and suspend IO over the region
3115 * that is being reshaped.
3117 * We backup data by writing it to one spare, or to a
3118 * file which was given on command line.
3120 * In each case, we first make sure that storage is available
3121 * for the required backup.
3123 * - request the shape change.
3124 * - fork to handle backup etc.
3126 /* Check that we can hold all the data */
3127 get_dev_size(fd
, NULL
, &array_size
);
3128 if (reshape
.new_size
< (array_size
/512)) {
3129 pr_err("this change will reduce the size of the array.\n"
3130 " use --grow --array-size first to truncate array.\n"
3131 " e.g. mdadm --grow %s --array-size %llu\n",
3132 devname
, reshape
.new_size
/2);
3136 if (array
.level
== 10) {
3137 /* Reshaping RAID10 does not require any data backup by
3138 * user-space. Instead it requires that the data_offset
3139 * is changed to avoid the need for backup.
3140 * So this is handled very separately
3143 /* Nothing to do. */
3145 return raid10_reshape(container
, fd
, devname
, st
, info
,
3146 &reshape
, data_offset
,
3149 sra
= sysfs_read(fd
, NULL
,
3150 GET_COMPONENT
|GET_DEVS
|GET_OFFSET
|GET_STATE
|GET_CHUNK
|
3153 pr_err("%s: Cannot get array details from sysfs\n",
3159 switch(set_new_data_offset(sra
, st
, devname
,
3160 reshape
.after
.data_disks
- reshape
.before
.data_disks
,
3162 reshape
.min_offset_change
, 1)) {
3166 /* Updated data_offset, so it's easy now */
3167 update_cache_size(container
, sra
, info
,
3168 min(reshape
.before
.data_disks
,
3169 reshape
.after
.data_disks
),
3170 reshape
.backup_blocks
);
3172 /* Right, everything seems fine. Let's kick things off.
3176 if (impose_reshape(sra
, info
, st
, fd
, restart
,
3177 devname
, container
, &reshape
) < 0)
3179 if (sysfs_set_str(sra
, NULL
, "sync_action", "reshape") < 0) {
3181 if (errno
!= EINVAL
) {
3182 pr_err("Failed to initiate reshape!\n");
3185 /* revert data_offset and try the old way */
3186 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
3187 sysfs_set_num(sra
, sd
, "new_offset",
3189 sysfs_set_str(sra
, NULL
, "reshape_direction",
3194 if (info
->new_level
== reshape
.level
)
3196 /* need to adjust level when reshape completes */
3198 case -1: /* ignore error, but don't wait */
3200 default: /* parent */
3208 fd
= open_dev(sra
->sys_name
);
3210 impose_level(fd
, info
->new_level
, devname
, verbose
);
3212 case 1: /* Couldn't set data_offset, try the old way */
3213 if (data_offset
!= INVALID_SECTORS
) {
3214 pr_err("Cannot update data_offset on this array\n");
3221 /* Decide how many blocks (sectors) for a reshape
3222 * unit. The number we have so far is just a minimum
3224 blocks
= reshape
.backup_blocks
;
3225 if (reshape
.before
.data_disks
==
3226 reshape
.after
.data_disks
) {
3227 /* Make 'blocks' bigger for better throughput, but
3228 * not so big that we reject it below.
3229 * Try for 16 megabytes
3231 while (blocks
* 32 < sra
->component_size
&&
3235 pr_err("Need to backup %luK of critical section..\n", blocks
/2);
3237 if (blocks
>= sra
->component_size
/2) {
3238 pr_err("%s: Something wrong - reshape aborted\n",
3243 /* Now we need to open all these devices so we can read/write.
3245 nrdisks
= max(reshape
.before
.data_disks
,
3246 reshape
.after
.data_disks
) + reshape
.parity
3247 + sra
->array
.spare_disks
;
3248 fdlist
= xcalloc((1+nrdisks
), sizeof(int));
3249 offsets
= xcalloc((1+nrdisks
), sizeof(offsets
[0]));
3251 odisks
= reshape
.before
.data_disks
+ reshape
.parity
;
3252 d
= reshape_prepare_fdlist(devname
, sra
, odisks
,
3253 nrdisks
, blocks
, backup_file
,
3258 if ((st
->ss
->manage_reshape
== NULL
) ||
3259 (st
->ss
->recover_backup
== NULL
)) {
3260 if (backup_file
== NULL
) {
3261 if (reshape
.after
.data_disks
<=
3262 reshape
.before
.data_disks
) {
3263 pr_err("%s: Cannot grow - need backup-file\n",
3265 pr_err(" Please provide one with \"--backup=...\"\n");
3267 } else if (d
== odisks
) {
3268 pr_err("%s: Cannot grow - need a spare or backup-file to backup critical section\n", devname
);
3272 if (!reshape_open_backup_file(backup_file
, fd
, devname
,
3274 fdlist
+d
, offsets
+d
,
3283 update_cache_size(container
, sra
, info
,
3284 min(reshape
.before
.data_disks
, reshape
.after
.data_disks
),
3287 /* Right, everything seems fine. Let's kick things off.
3288 * If only changing raid_disks, use ioctl, else use
3293 if (impose_reshape(sra
, info
, st
, fd
, restart
,
3294 devname
, container
, &reshape
) < 0)
3297 err
= start_reshape(sra
, restart
, reshape
.before
.data_disks
,
3298 reshape
.after
.data_disks
);
3300 pr_err("Cannot %s reshape for %s\n",
3301 restart
? "continue" : "start",
3306 sysfs_set_str(sra
, NULL
, "array_state", "active");
3307 if (freeze_reshape
) {
3311 pr_err("Reshape has to be continued from location %llu when root filesystem has been mounted.\n",
3312 sra
->reshape_progress
);
3316 if (!forked
&& !check_env("MDADM_NO_SYSTEMCTL"))
3317 if (continue_via_systemd(container
?: sra
->sys_name
)) {
3324 /* Now we just need to kick off the reshape and watch, while
3325 * handling backups of the data...
3326 * This is all done by a forked background process.
3328 switch(forked
? 0 : fork()) {
3330 pr_err("Cannot run child to monitor reshape: %s\n",
3344 /* If another array on the same devices is busy, the
3345 * reshape will wait for them. This would mean that
3346 * the first section that we suspend will stay suspended
3347 * for a long time. So check on that possibility
3348 * by looking for "DELAYED" in /proc/mdstat, and if found,
3352 struct mdstat_ent
*mds
, *m
;
3354 mds
= mdstat_read(1, 0);
3355 for (m
= mds
; m
; m
= m
->next
)
3356 if (strcmp(m
->devnm
, sra
->sys_name
) == 0) {
3358 m
->percent
== RESYNC_DELAYED
)
3361 /* Haven't started the reshape thread
3368 if (delayed
== 1 && get_linux_version() < 3007000) {
3369 pr_err("Reshape is delayed, but cannot wait carefully with this kernel.\n"
3370 " You might experience problems until other reshapes complete.\n");
3374 mdstat_wait(30 - (delayed
-1) * 25);
3378 if (check_env("MDADM_GROW_VERIFY"))
3379 fd
= open(devname
, O_RDONLY
| O_DIRECT
);
3382 mlockall(MCL_FUTURE
);
3384 signal(SIGTERM
, catch_term
);
3386 if (st
->ss
->external
) {
3387 /* metadata handler takes it from here */
3388 done
= st
->ss
->manage_reshape(
3389 fd
, sra
, &reshape
, st
, blocks
,
3391 d
- odisks
, fdlist
+odisks
,
3394 done
= child_monitor(
3395 fd
, sra
, &reshape
, st
, blocks
,
3397 d
- odisks
, fdlist
+odisks
,
3403 if (backup_file
&& done
) {
3405 bul
= make_backup(sra
->sys_name
);
3408 int l
= readlink(bul
, buf
, sizeof(buf
) - 1);
3416 unlink(backup_file
);
3423 if (!st
->ss
->external
&&
3424 !(reshape
.before
.data_disks
!= reshape
.after
.data_disks
3425 && info
->custom_array_size
) &&
3426 info
->new_level
== reshape
.level
&&
3428 /* no need to wait for the reshape to finish as
3429 * there is nothing more to do.
3436 if (st
->ss
->external
) {
3437 /* Re-load the metadata as much could have changed */
3438 int cfd
= open_dev(st
->container_devnm
);
3440 flush_mdmon(container
);
3441 st
->ss
->free_super(st
);
3442 st
->ss
->load_container(st
, cfd
, container
);
3447 /* set new array size if required customer_array_size is used
3450 if (reshape
.before
.data_disks
!=
3451 reshape
.after
.data_disks
&&
3452 info
->custom_array_size
)
3453 set_array_size(st
, info
, info
->text_version
);
3455 if (info
->new_level
!= reshape
.level
) {
3457 fd
= open(devname
, O_RDONLY
);
3458 impose_level(fd
, info
->new_level
, devname
, verbose
);
3460 if (info
->new_level
== 0)
3461 st
->update_tail
= NULL
;
3473 if (orig_level
!= UnSet
&& sra
) {
3474 c
= map_num(pers
, orig_level
);
3475 if (c
&& sysfs_set_str(sra
, NULL
, "level", c
) == 0)
3476 pr_err("aborting level change\n");
3484 /* mdfd handle is passed to be closed in child process (after fork).
3486 int reshape_container(char *container
, char *devname
,
3488 struct supertype
*st
,
3489 struct mdinfo
*info
,
3491 char *backup_file
, int verbose
,
3492 int forked
, int restart
, int freeze_reshape
)
3494 struct mdinfo
*cc
= NULL
;
3496 char last_devnm
[32] = "";
3498 /* component_size is not meaningful for a container,
3499 * so pass '0' meaning 'no change'
3502 reshape_super(st
, 0, info
->new_level
,
3503 info
->new_layout
, info
->new_chunk
,
3504 info
->array
.raid_disks
, info
->delta_disks
,
3505 backup_file
, devname
, APPLY_METADATA_CHANGES
,
3513 /* ping monitor to be sure that update is on disk
3515 ping_monitor(container
);
3517 if (!forked
&& !freeze_reshape
&& !check_env("MDADM_NO_SYSTEMCTL"))
3518 if (continue_via_systemd(container
))
3521 switch (forked
? 0 : fork()) {
3522 case -1: /* error */
3523 perror("Cannot fork to complete reshape\n");
3526 default: /* parent */
3527 if (!freeze_reshape
)
3528 printf("%s: multi-array reshape continues in background\n", Name
);
3535 /* close unused handle in child process
3541 /* For each member array with reshape_active,
3542 * we need to perform the reshape.
3543 * We pick the first array that needs reshaping and
3544 * reshape it. reshape_array() will re-read the metadata
3545 * so the next time through a different array should be
3546 * ready for reshape.
3547 * It is possible that the 'different' array will not
3548 * be assembled yet. In that case we simple exit.
3549 * When it is assembled, the mdadm which assembles it
3550 * will take over the reshape.
3552 struct mdinfo
*content
;
3554 struct mdstat_ent
*mdstat
;
3560 cc
= st
->ss
->container_content(st
, NULL
);
3562 for (content
= cc
; content
; content
= content
->next
) {
3564 if (!content
->reshape_active
)
3567 subarray
= strchr(content
->text_version
+1, '/')+1;
3568 mdstat
= mdstat_by_subdev(subarray
, container
);
3571 if (mdstat
->active
== 0) {
3572 pr_err("Skipping inactive array %s.\n",
3574 free_mdstat(mdstat
);
3583 devid
= devnm2devid(mdstat
->devnm
);
3584 adev
= map_dev(major(devid
), minor(devid
), 0);
3586 adev
= content
->text_version
;
3588 fd
= open_dev(mdstat
->devnm
);
3590 pr_err("Device %s cannot be opened for reshape.\n", adev
);
3594 if (strcmp(last_devnm
, mdstat
->devnm
) == 0) {
3595 /* Do not allow for multiple reshape_array() calls for
3597 * It can happen when reshape_array() returns without
3598 * error, when reshape is not finished (wrong reshape
3599 * starting/continuation conditions). Mdmon doesn't
3600 * switch to next array in container and reentry
3601 * conditions for the same array occur.
3602 * This is possibly interim until the behaviour of
3603 * reshape_array is resolved().
3605 printf("%s: Multiple reshape execution detected for device %s.\n", Name
, adev
);
3609 strcpy(last_devnm
, mdstat
->devnm
);
3611 sysfs_init(content
, fd
, mdstat
->devnm
);
3613 if (mdmon_running(container
))
3614 flush_mdmon(container
);
3616 rv
= reshape_array(container
, fd
, adev
, st
,
3617 content
, force
, NULL
, INVALID_SECTORS
,
3618 backup_file
, verbose
, 1, restart
,
3622 if (freeze_reshape
) {
3631 if (mdmon_running(container
))
3632 flush_mdmon(container
);
3641 * We run a child process in the background which performs the following
3643 * - wait for resync to reach a certain point
3644 * - suspend io to the following section
3645 * - backup that section
3646 * - allow resync to proceed further
3648 * - discard the backup.
3650 * When are combined in slightly different ways in the three cases.
3652 * - suspend/backup/allow/wait/resume/discard
3654 * - allow/wait/suspend/backup/allow/wait/resume/discard
3656 * - wait/resume/discard/suspend/backup/allow
3658 * suspend/backup/allow always come together
3659 * wait/resume/discard do too.
3660 * For the same-size case we have two backups to improve flow.
3664 int progress_reshape(struct mdinfo
*info
, struct reshape
*reshape
,
3665 unsigned long long backup_point
,
3666 unsigned long long wait_point
,
3667 unsigned long long *suspend_point
,
3668 unsigned long long *reshape_completed
, int *frozen
)
3670 /* This function is called repeatedly by the reshape manager.
3671 * It determines how much progress can safely be made and allows
3673 * - 'info' identifies the array and particularly records in
3674 * ->reshape_progress the metadata's knowledge of progress
3675 * This is a sector offset from the start of the array
3676 * of the next array block to be relocated. This number
3677 * may increase from 0 or decrease from array_size, depending
3678 * on the type of reshape that is happening.
3679 * Note that in contrast, 'sync_completed' is a block count of the
3680 * reshape so far. It gives the distance between the start point
3681 * (head or tail of device) and the next place that data will be
3682 * written. It always increases.
3683 * - 'reshape' is the structure created by analyse_change
3684 * - 'backup_point' shows how much the metadata manager has backed-up
3685 * data. For reshapes with increasing progress, it is the next address
3686 * to be backed up, previous addresses have been backed-up. For
3687 * decreasing progress, it is the earliest address that has been
3688 * backed up - later address are also backed up.
3689 * So addresses between reshape_progress and backup_point are
3690 * backed up providing those are in the 'correct' order.
3691 * - 'wait_point' is an array address. When reshape_completed
3692 * passes this point, progress_reshape should return. It might
3693 * return earlier if it determines that ->reshape_progress needs
3694 * to be updated or further backup is needed.
3695 * - suspend_point is maintained by progress_reshape and the caller
3696 * should not touch it except to initialise to zero.
3697 * It is an array address and it only increases in 2.6.37 and earlier.
3698 * This makes it difficult to handle reducing reshapes with
3699 * external metadata.
3700 * However: it is similar to backup_point in that it records the
3701 * other end of a suspended region from reshape_progress.
3702 * it is moved to extend the region that is safe to backup and/or
3704 * - reshape_completed is read from sysfs and returned. The caller
3705 * should copy this into ->reshape_progress when it has reason to
3706 * believe that the metadata knows this, and any backup outside this
3710 * 1 if more data from backup_point - but only as far as suspend_point,
3711 * should be backed up
3712 * 0 if things are progressing smoothly
3713 * -1 if the reshape is finished because it is all done,
3714 * -2 if the reshape is finished due to an error.
3717 int advancing
= (reshape
->after
.data_disks
3718 >= reshape
->before
.data_disks
);
3719 unsigned long long need_backup
; /* All data between start of array and
3720 * here will at some point need to
3723 unsigned long long read_offset
, write_offset
;
3724 unsigned long long write_range
;
3725 unsigned long long max_progress
, target
, completed
;
3726 unsigned long long array_size
= (info
->component_size
3727 * reshape
->before
.data_disks
);
3731 /* First, we unsuspend any region that is now known to be safe.
3732 * If suspend_point is on the 'wrong' side of reshape_progress, then
3733 * we don't have or need suspension at the moment. This is true for
3734 * native metadata when we don't need to back-up.
3737 if (info
->reshape_progress
<= *suspend_point
)
3738 sysfs_set_num(info
, NULL
, "suspend_lo",
3739 info
->reshape_progress
);
3741 /* Note: this won't work in 2.6.37 and before.
3742 * Something somewhere should make sure we don't need it!
3744 if (info
->reshape_progress
>= *suspend_point
)
3745 sysfs_set_num(info
, NULL
, "suspend_hi",
3746 info
->reshape_progress
);
3749 /* Now work out how far it is safe to progress.
3750 * If the read_offset for ->reshape_progress is less than
3751 * 'blocks' beyond the write_offset, we can only progress as far
3753 * Otherwise we can progress until the write_offset for the new location
3754 * reaches (within 'blocks' of) the read_offset at the current location.
3755 * However that region must be suspended unless we are using native
3757 * If we need to suspend more, we limit it to 128M per device, which is
3758 * rather arbitrary and should be some time-based calculation.
3760 read_offset
= info
->reshape_progress
/ reshape
->before
.data_disks
;
3761 write_offset
= info
->reshape_progress
/ reshape
->after
.data_disks
;
3762 write_range
= info
->new_chunk
/512;
3763 if (reshape
->before
.data_disks
== reshape
->after
.data_disks
)
3764 need_backup
= array_size
;
3766 need_backup
= reshape
->backup_blocks
;
3768 if (read_offset
< write_offset
+ write_range
)
3769 max_progress
= backup_point
;
3773 reshape
->after
.data_disks
;
3775 if (read_offset
> write_offset
- write_range
)
3776 /* Can only progress as far as has been backed up,
3777 * which must be suspended */
3778 max_progress
= backup_point
;
3779 else if (info
->reshape_progress
<= need_backup
)
3780 max_progress
= backup_point
;
3782 if (info
->array
.major_version
>= 0)
3783 /* Can progress until backup is needed */
3784 max_progress
= need_backup
;
3786 /* Can progress until metadata update is required */
3789 reshape
->after
.data_disks
;
3790 /* but data must be suspended */
3791 if (max_progress
< *suspend_point
)
3792 max_progress
= *suspend_point
;
3797 /* We know it is safe to progress to 'max_progress' providing
3798 * it is suspended or we are using native metadata.
3799 * Consider extending suspend_point 128M per device if it
3800 * is less than 64M per device beyond reshape_progress.
3801 * But always do a multiple of 'blocks'
3802 * FIXME this is too big - it takes to long to complete
3805 target
= 64*1024*2 * min(reshape
->before
.data_disks
,
3806 reshape
->after
.data_disks
);
3807 target
/= reshape
->backup_blocks
;
3810 target
*= reshape
->backup_blocks
;
3812 /* For externally managed metadata we always need to suspend IO to
3813 * the area being reshaped so we regularly push suspend_point forward.
3814 * For native metadata we only need the suspend if we are going to do
3818 if ((need_backup
> info
->reshape_progress
3819 || info
->array
.major_version
< 0) &&
3820 *suspend_point
< info
->reshape_progress
+ target
) {
3821 if (need_backup
< *suspend_point
+ 2 * target
)
3822 *suspend_point
= need_backup
;
3823 else if (*suspend_point
+ 2 * target
< array_size
)
3824 *suspend_point
+= 2 * target
;
3826 *suspend_point
= array_size
;
3827 sysfs_set_num(info
, NULL
, "suspend_hi", *suspend_point
);
3828 if (max_progress
> *suspend_point
)
3829 max_progress
= *suspend_point
;
3832 if (info
->array
.major_version
>= 0) {
3833 /* Only need to suspend when about to backup */
3834 if (info
->reshape_progress
< need_backup
* 2 &&
3835 *suspend_point
> 0) {
3837 sysfs_set_num(info
, NULL
, "suspend_lo", 0);
3838 sysfs_set_num(info
, NULL
, "suspend_hi", need_backup
);
3841 /* Need to suspend continually */
3842 if (info
->reshape_progress
< *suspend_point
)
3843 *suspend_point
= info
->reshape_progress
;
3844 if (*suspend_point
+ target
< info
->reshape_progress
)
3845 /* No need to move suspend region yet */;
3847 if (*suspend_point
>= 2 * target
)
3848 *suspend_point
-= 2 * target
;
3851 sysfs_set_num(info
, NULL
, "suspend_lo",
3854 if (max_progress
< *suspend_point
)
3855 max_progress
= *suspend_point
;
3859 /* now set sync_max to allow that progress. sync_max, like
3860 * sync_completed is a count of sectors written per device, so
3861 * we find the difference between max_progress and the start point,
3862 * and divide that by after.data_disks to get a sync_max
3864 * At the same time we convert wait_point to a similar number
3865 * for comparing against sync_completed.
3867 /* scale down max_progress to per_disk */
3868 max_progress
/= reshape
->after
.data_disks
;
3869 /* Round to chunk size as some kernels give an erroneously high number */
3870 max_progress
/= info
->new_chunk
/512;
3871 max_progress
*= info
->new_chunk
/512;
3872 /* And round to old chunk size as the kernel wants that */
3873 max_progress
/= info
->array
.chunk_size
/512;
3874 max_progress
*= info
->array
.chunk_size
/512;
3875 /* Limit progress to the whole device */
3876 if (max_progress
> info
->component_size
)
3877 max_progress
= info
->component_size
;
3878 wait_point
/= reshape
->after
.data_disks
;
3880 /* switch from 'device offset' to 'processed block count' */
3881 max_progress
= info
->component_size
- max_progress
;
3882 wait_point
= info
->component_size
- wait_point
;
3886 sysfs_set_num(info
, NULL
, "sync_max", max_progress
);
3888 /* Now wait. If we have already reached the point that we were
3889 * asked to wait to, don't wait at all, else wait for any change.
3890 * We need to select on 'sync_completed' as that is the place that
3891 * notifications happen, but we are really interested in
3892 * 'reshape_position'
3894 fd
= sysfs_get_fd(info
, NULL
, "sync_completed");
3896 goto check_progress
;
3898 if (sysfs_fd_get_ll(fd
, &completed
) < 0)
3899 goto check_progress
;
3901 while (completed
< max_progress
&& completed
< wait_point
) {
3902 /* Check that sync_action is still 'reshape' to avoid
3903 * waiting forever on a dead array
3906 if (sysfs_get_str(info
, NULL
, "sync_action",
3908 strncmp(action
, "reshape", 7) != 0)
3910 /* Some kernels reset 'sync_completed' to zero
3911 * before setting 'sync_action' to 'idle'.
3912 * So we need these extra tests.
3914 if (completed
== 0 && advancing
3915 && strncmp(action
, "idle", 4) == 0
3916 && info
->reshape_progress
> 0)
3918 if (completed
== 0 && !advancing
3919 && strncmp(action
, "idle", 4) == 0
3920 && info
->reshape_progress
< (info
->component_size
3921 * reshape
->after
.data_disks
))
3923 sysfs_wait(fd
, NULL
);
3924 if (sysfs_fd_get_ll(fd
, &completed
) < 0)
3925 goto check_progress
;
3927 /* Some kernels reset 'sync_completed' to zero,
3928 * we need to have real point we are in md.
3929 * So in that case, read 'reshape_position' from sysfs.
3931 if (completed
== 0) {
3932 unsigned long long reshapep
;
3934 if (sysfs_get_str(info
, NULL
, "sync_action",
3936 strncmp(action
, "idle", 4) == 0 &&
3937 sysfs_get_ll(info
, NULL
,
3938 "reshape_position", &reshapep
) == 0)
3939 *reshape_completed
= reshapep
;
3941 /* some kernels can give an incorrectly high
3942 * 'completed' number, so round down */
3943 completed
/= (info
->new_chunk
/512);
3944 completed
*= (info
->new_chunk
/512);
3945 /* Convert 'completed' back in to a 'progress' number */
3946 completed
*= reshape
->after
.data_disks
;
3948 completed
= (info
->component_size
3949 * reshape
->after
.data_disks
3951 *reshape_completed
= completed
;
3956 /* We return the need_backup flag. Caller will decide
3957 * how much - a multiple of ->backup_blocks up to *suspend_point
3960 return need_backup
> info
->reshape_progress
;
3962 return need_backup
>= info
->reshape_progress
;
3965 /* if we couldn't read a number from sync_completed, then
3966 * either the reshape did complete, or it aborted.
3967 * We can tell which by checking for 'none' in reshape_position.
3968 * If it did abort, then it might immediately restart if it
3969 * it was just a device failure that leaves us degraded but
3972 if (sysfs_get_str(info
, NULL
, "reshape_position", buf
, sizeof(buf
)) < 0
3973 || strncmp(buf
, "none", 4) != 0) {
3974 /* The abort might only be temporary. Wait up to 10
3975 * seconds for fd to contain a valid number again.
3979 unsigned long long new_sync_max
;
3980 while (fd
>= 0 && rv
< 0 && wait
> 0) {
3981 if (sysfs_wait(fd
, &wait
) != 1)
3983 switch (sysfs_fd_get_ll(fd
, &completed
)) {
3985 /* all good again */
3987 /* If "sync_max" is no longer max_progress
3988 * we need to freeze things
3990 sysfs_get_ll(info
, NULL
, "sync_max", &new_sync_max
);
3991 *frozen
= (new_sync_max
!= max_progress
);
3993 case -2: /* read error - abort */
4000 return rv
; /* abort */
4002 /* Maybe racing with array shutdown - check state */
4005 if (sysfs_get_str(info
, NULL
, "array_state", buf
, sizeof(buf
)) < 0
4006 || strncmp(buf
, "inactive", 8) == 0
4007 || strncmp(buf
, "clear",5) == 0)
4008 return -2; /* abort */
4009 return -1; /* complete */
4013 /* FIXME return status is never checked */
4014 static int grow_backup(struct mdinfo
*sra
,
4015 unsigned long long offset
, /* per device */
4016 unsigned long stripes
, /* per device, in old chunks */
4017 int *sources
, unsigned long long *offsets
,
4018 int disks
, int chunk
, int level
, int layout
,
4019 int dests
, int *destfd
, unsigned long long *destoffsets
,
4020 int part
, int *degraded
,
4023 /* Backup 'blocks' sectors at 'offset' on each device of the array,
4024 * to storage 'destfd' (offset 'destoffsets'), after first
4025 * suspending IO. Then allow resync to continue
4026 * over the suspended section.
4027 * Use part 'part' of the backup-super-block.
4032 unsigned long long ll
;
4034 //printf("offset %llu\n", offset);
4040 /* Check that array hasn't become degraded, else we might backup the wrong data */
4041 if (sysfs_get_ll(sra
, NULL
, "degraded", &ll
) < 0)
4042 return -1; /* FIXME this error is ignored */
4043 new_degraded
= (int)ll
;
4044 if (new_degraded
!= *degraded
) {
4045 /* check each device to ensure it is still working */
4047 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
4048 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
4050 if (sd
->disk
.state
& (1<<MD_DISK_SYNC
)) {
4052 if (sysfs_get_str(sra
, sd
, "state", sbuf
, 20) < 0 ||
4053 strstr(sbuf
, "faulty") ||
4054 strstr(sbuf
, "in_sync") == NULL
) {
4055 /* this device is dead */
4056 sd
->disk
.state
= (1<<MD_DISK_FAULTY
);
4057 if (sd
->disk
.raid_disk
>= 0 &&
4058 sources
[sd
->disk
.raid_disk
] >= 0) {
4059 close(sources
[sd
->disk
.raid_disk
]);
4060 sources
[sd
->disk
.raid_disk
] = -1;
4065 *degraded
= new_degraded
;
4068 bsb
.arraystart2
= __cpu_to_le64(offset
* odata
);
4069 bsb
.length2
= __cpu_to_le64(stripes
* (chunk
/512) * odata
);
4071 bsb
.arraystart
= __cpu_to_le64(offset
* odata
);
4072 bsb
.length
= __cpu_to_le64(stripes
* (chunk
/512) * odata
);
4075 bsb
.magic
[15] = '2';
4076 for (i
= 0; i
< dests
; i
++)
4078 lseek64(destfd
[i
], destoffsets
[i
] + __le64_to_cpu(bsb
.devstart2
)*512, 0);
4080 lseek64(destfd
[i
], destoffsets
[i
], 0);
4082 rv
= save_stripes(sources
, offsets
,
4083 disks
, chunk
, level
, layout
,
4085 offset
*512*odata
, stripes
* chunk
* odata
,
4090 bsb
.mtime
= __cpu_to_le64(time(0));
4091 for (i
= 0; i
< dests
; i
++) {
4092 bsb
.devstart
= __cpu_to_le64(destoffsets
[i
]/512);
4094 bsb
.sb_csum
= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
));
4095 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0)
4096 bsb
.sb_csum2
= bsb_csum((char*)&bsb
,
4097 ((char*)&bsb
.sb_csum2
)-((char*)&bsb
));
4100 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
] - 4096, 0)
4101 != destoffsets
[i
] - 4096)
4103 if (write(destfd
[i
], &bsb
, 512) != 512)
4105 if (destoffsets
[i
] > 4096) {
4106 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
]+stripes
*chunk
*odata
, 0) !=
4107 destoffsets
[i
]+stripes
*chunk
*odata
)
4109 if (write(destfd
[i
], &bsb
, 512) != 512)
4119 /* in 2.6.30, the value reported by sync_completed can be
4120 * less that it should be by one stripe.
4121 * This only happens when reshape hits sync_max and pauses.
4122 * So allow wait_backup to either extent sync_max further
4123 * than strictly necessary, or return before the
4124 * sync has got quite as far as we would really like.
4125 * This is what 'blocks2' is for.
4126 * The various caller give appropriate values so that
4129 /* FIXME return value is often ignored */
4130 static int forget_backup(int dests
, int *destfd
,
4131 unsigned long long *destoffsets
,
4135 * Erase backup 'part' (which is 0 or 1)
4141 bsb
.arraystart2
= __cpu_to_le64(0);
4142 bsb
.length2
= __cpu_to_le64(0);
4144 bsb
.arraystart
= __cpu_to_le64(0);
4145 bsb
.length
= __cpu_to_le64(0);
4147 bsb
.mtime
= __cpu_to_le64(time(0));
4149 for (i
= 0; i
< dests
; i
++) {
4150 bsb
.devstart
= __cpu_to_le64(destoffsets
[i
]/512);
4151 bsb
.sb_csum
= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
));
4152 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0)
4153 bsb
.sb_csum2
= bsb_csum((char*)&bsb
,
4154 ((char*)&bsb
.sb_csum2
)-((char*)&bsb
));
4155 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
]-4096, 0) !=
4156 destoffsets
[i
]-4096)
4159 write(destfd
[i
], &bsb
, 512) != 512)
4166 static void fail(char *msg
)
4169 rv
= (write(2, msg
, strlen(msg
)) != (int)strlen(msg
));
4170 rv
|= (write(2, "\n", 1) != 1);
4174 static char *abuf
, *bbuf
;
4175 static unsigned long long abuflen
;
4176 static void validate(int afd
, int bfd
, unsigned long long offset
)
4178 /* check that the data in the backup against the array.
4179 * This is only used for regression testing and should not
4180 * be used while the array is active
4184 lseek64(bfd
, offset
- 4096, 0);
4185 if (read(bfd
, &bsb2
, 512) != 512)
4186 fail("cannot read bsb");
4187 if (bsb2
.sb_csum
!= bsb_csum((char*)&bsb2
,
4188 ((char*)&bsb2
.sb_csum
)-((char*)&bsb2
)))
4189 fail("first csum bad");
4190 if (memcmp(bsb2
.magic
, "md_backup_data", 14) != 0)
4191 fail("magic is bad");
4192 if (memcmp(bsb2
.magic
, "md_backup_data-2", 16) == 0 &&
4193 bsb2
.sb_csum2
!= bsb_csum((char*)&bsb2
,
4194 ((char*)&bsb2
.sb_csum2
)-((char*)&bsb2
)))
4195 fail("second csum bad");
4197 if (__le64_to_cpu(bsb2
.devstart
)*512 != offset
)
4198 fail("devstart is wrong");
4201 unsigned long long len
= __le64_to_cpu(bsb2
.length
)*512;
4203 if (abuflen
< len
) {
4207 if (posix_memalign((void**)&abuf
, 4096, abuflen
) ||
4208 posix_memalign((void**)&bbuf
, 4096, abuflen
)) {
4210 /* just stop validating on mem-alloc failure */
4215 lseek64(bfd
, offset
, 0);
4216 if ((unsigned long long)read(bfd
, bbuf
, len
) != len
) {
4217 //printf("len %llu\n", len);
4218 fail("read first backup failed");
4220 lseek64(afd
, __le64_to_cpu(bsb2
.arraystart
)*512, 0);
4221 if ((unsigned long long)read(afd
, abuf
, len
) != len
)
4222 fail("read first from array failed");
4223 if (memcmp(bbuf
, abuf
, len
) != 0) {
4226 printf("offset=%llu len=%llu\n",
4227 (unsigned long long)__le64_to_cpu(bsb2
.arraystart
)*512, len
);
4228 for (i
=0; i
<len
; i
++)
4229 if (bbuf
[i
] != abuf
[i
]) {
4230 printf("first diff byte %d\n", i
);
4234 fail("data1 compare failed");
4238 unsigned long long len
= __le64_to_cpu(bsb2
.length2
)*512;
4240 if (abuflen
< len
) {
4244 abuf
= xmalloc(abuflen
);
4245 bbuf
= xmalloc(abuflen
);
4248 lseek64(bfd
, offset
+__le64_to_cpu(bsb2
.devstart2
)*512, 0);
4249 if ((unsigned long long)read(bfd
, bbuf
, len
) != len
)
4250 fail("read second backup failed");
4251 lseek64(afd
, __le64_to_cpu(bsb2
.arraystart2
)*512, 0);
4252 if ((unsigned long long)read(afd
, abuf
, len
) != len
)
4253 fail("read second from array failed");
4254 if (memcmp(bbuf
, abuf
, len
) != 0)
4255 fail("data2 compare failed");
4259 int child_monitor(int afd
, struct mdinfo
*sra
, struct reshape
*reshape
,
4260 struct supertype
*st
, unsigned long blocks
,
4261 int *fds
, unsigned long long *offsets
,
4262 int dests
, int *destfd
, unsigned long long *destoffsets
)
4264 /* Monitor a reshape where backup is being performed using
4265 * 'native' mechanism - either to a backup file, or
4266 * to some space in a spare.
4270 unsigned long long speed
;
4271 unsigned long long suspend_point
, array_size
;
4272 unsigned long long backup_point
, wait_point
;
4273 unsigned long long reshape_completed
;
4275 int increasing
= reshape
->after
.data_disks
>= reshape
->before
.data_disks
;
4276 int part
= 0; /* The next part of the backup area to fill. It may already
4277 * be full, so we need to check */
4278 int level
= reshape
->level
;
4279 int layout
= reshape
->before
.layout
;
4280 int data
= reshape
->before
.data_disks
;
4281 int disks
= reshape
->before
.data_disks
+ reshape
->parity
;
4282 int chunk
= sra
->array
.chunk_size
;
4284 unsigned long stripes
;
4288 /* set up the backup-super-block. This requires the
4289 * uuid from the array.
4291 /* Find a superblock */
4292 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
4296 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
4298 dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 1);
4299 devfd
= dev_open(dn
, O_RDONLY
);
4302 ok
= st
->ss
->load_super(st
, devfd
, NULL
);
4308 pr_err("Cannot find a superblock\n");
4312 memset(&bsb
, 0, 512);
4313 memcpy(bsb
.magic
, "md_backup_data-1", 16);
4314 st
->ss
->uuid_from_super(st
, uuid
);
4315 memcpy(bsb
.set_uuid
, uuid
, 16);
4316 bsb
.mtime
= __cpu_to_le64(time(0));
4317 bsb
.devstart2
= blocks
;
4319 stripes
= blocks
/ (sra
->array
.chunk_size
/512) /
4320 reshape
->before
.data_disks
;
4322 if (posix_memalign((void**)&buf
, 4096, disks
* chunk
))
4323 /* Don't start the 'reshape' */
4325 if (reshape
->before
.data_disks
== reshape
->after
.data_disks
) {
4326 sysfs_get_ll(sra
, NULL
, "sync_speed_min", &speed
);
4327 sysfs_set_num(sra
, NULL
, "sync_speed_min", 200000);
4331 array_size
= sra
->component_size
* reshape
->after
.data_disks
;
4332 backup_point
= sra
->reshape_progress
;
4335 array_size
= sra
->component_size
* reshape
->before
.data_disks
;
4336 backup_point
= reshape
->backup_blocks
;
4337 suspend_point
= array_size
;
4343 /* Want to return as soon the oldest backup slot can
4344 * be released as that allows us to start backing up
4345 * some more, providing suspend_point has been
4346 * advanced, which it should have.
4349 wait_point
= array_size
;
4350 if (part
== 0 && __le64_to_cpu(bsb
.length
) > 0)
4351 wait_point
= (__le64_to_cpu(bsb
.arraystart
) +
4352 __le64_to_cpu(bsb
.length
));
4353 if (part
== 1 && __le64_to_cpu(bsb
.length2
) > 0)
4354 wait_point
= (__le64_to_cpu(bsb
.arraystart2
) +
4355 __le64_to_cpu(bsb
.length2
));
4358 if (part
== 0 && __le64_to_cpu(bsb
.length
) > 0)
4359 wait_point
= __le64_to_cpu(bsb
.arraystart
);
4360 if (part
== 1 && __le64_to_cpu(bsb
.length2
) > 0)
4361 wait_point
= __le64_to_cpu(bsb
.arraystart2
);
4364 reshape_completed
= sra
->reshape_progress
;
4365 rv
= progress_reshape(sra
, reshape
,
4366 backup_point
, wait_point
,
4367 &suspend_point
, &reshape_completed
,
4369 /* external metadata would need to ping_monitor here */
4370 sra
->reshape_progress
= reshape_completed
;
4372 /* Clear any backup region that is before 'here' */
4374 if (__le64_to_cpu(bsb
.length
) > 0 &&
4375 reshape_completed
>= (__le64_to_cpu(bsb
.arraystart
) +
4376 __le64_to_cpu(bsb
.length
)))
4377 forget_backup(dests
, destfd
,
4379 if (__le64_to_cpu(bsb
.length2
) > 0 &&
4380 reshape_completed
>= (__le64_to_cpu(bsb
.arraystart2
) +
4381 __le64_to_cpu(bsb
.length2
)))
4382 forget_backup(dests
, destfd
,
4385 if (__le64_to_cpu(bsb
.length
) > 0 &&
4386 reshape_completed
<= (__le64_to_cpu(bsb
.arraystart
)))
4387 forget_backup(dests
, destfd
,
4389 if (__le64_to_cpu(bsb
.length2
) > 0 &&
4390 reshape_completed
<= (__le64_to_cpu(bsb
.arraystart2
)))
4391 forget_backup(dests
, destfd
,
4401 if (rv
== 0 && increasing
&& !st
->ss
->external
) {
4402 /* No longer need to monitor this reshape */
4403 sysfs_set_str(sra
, NULL
, "sync_max", "max");
4409 unsigned long long offset
;
4410 unsigned long actual_stripes
;
4411 /* Need to backup some data.
4412 * If 'part' is not used and the desired
4413 * backup size is suspended, do a backup,
4414 * then consider the next part.
4416 /* Check that 'part' is unused */
4417 if (part
== 0 && __le64_to_cpu(bsb
.length
) != 0)
4419 if (part
== 1 && __le64_to_cpu(bsb
.length2
) != 0)
4422 offset
= backup_point
/ data
;
4423 actual_stripes
= stripes
;
4425 if (offset
+ actual_stripes
* (chunk
/512) >
4426 sra
->component_size
)
4427 actual_stripes
= ((sra
->component_size
- offset
)
4429 if (offset
+ actual_stripes
* (chunk
/512) >
4433 if (offset
< actual_stripes
* (chunk
/512))
4434 actual_stripes
= offset
/ (chunk
/512);
4435 offset
-= actual_stripes
* (chunk
/512);
4436 if (offset
< suspend_point
/data
)
4439 if (actual_stripes
== 0)
4441 grow_backup(sra
, offset
, actual_stripes
,
4443 disks
, chunk
, level
, layout
,
4444 dests
, destfd
, destoffsets
,
4445 part
, °raded
, buf
);
4446 validate(afd
, destfd
[0], destoffsets
[0]);
4447 /* record where 'part' is up to */
4450 backup_point
+= actual_stripes
* (chunk
/512) * data
;
4452 backup_point
-= actual_stripes
* (chunk
/512) * data
;
4456 /* FIXME maybe call progress_reshape one more time instead */
4457 /* remove any remaining suspension */
4458 sysfs_set_num(sra
, NULL
, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL
);
4459 sysfs_set_num(sra
, NULL
, "suspend_hi", 0);
4460 sysfs_set_num(sra
, NULL
, "suspend_lo", 0);
4461 sysfs_set_num(sra
, NULL
, "sync_min", 0);
4463 if (reshape
->before
.data_disks
== reshape
->after
.data_disks
)
4464 sysfs_set_num(sra
, NULL
, "sync_speed_min", speed
);
4470 * If any spare contains md_back_data-1 which is recent wrt mtime,
4471 * write that data into the array and update the super blocks with
4472 * the new reshape_progress
4474 int Grow_restart(struct supertype
*st
, struct mdinfo
*info
, int *fdlist
, int cnt
,
4475 char *backup_file
, int verbose
)
4479 unsigned long long *offsets
;
4480 unsigned long long nstripe
, ostripe
;
4483 odata
= info
->array
.raid_disks
- info
->delta_disks
- 1;
4484 if (info
->array
.level
== 6) odata
--; /* number of data disks */
4485 ndata
= info
->array
.raid_disks
- 1;
4486 if (info
->new_level
== 6) ndata
--;
4488 old_disks
= info
->array
.raid_disks
- info
->delta_disks
;
4490 if (info
->delta_disks
<= 0)
4491 /* Didn't grow, so the backup file must have
4495 for (i
=old_disks
-(backup_file
?1:0); i
<cnt
; i
++) {
4496 struct mdinfo dinfo
;
4499 char *devname
, namebuf
[20];
4500 unsigned long long lo
, hi
;
4502 /* This was a spare and may have some saved data on it.
4503 * Load the superblock, find and load the
4504 * backup_super_block.
4505 * If either fail, go on to next device.
4506 * If the backup contains no new info, just return
4507 * else restore data and update all superblocks
4509 if (i
== old_disks
-1) {
4510 fd
= open(backup_file
, O_RDONLY
);
4512 pr_err("backup file %s inaccessible: %s\n",
4513 backup_file
, strerror(errno
));
4516 devname
= backup_file
;
4521 if (st
->ss
->load_super(st
, fd
, NULL
))
4524 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
4525 st
->ss
->free_super(st
);
4528 (dinfo
.data_offset
+ dinfo
.component_size
- 8) <<9,
4530 pr_err("Cannot seek on device %d\n", i
);
4531 continue; /* Cannot seek */
4533 sprintf(namebuf
, "device-%d", i
);
4536 if (read(fd
, &bsb
, sizeof(bsb
)) != sizeof(bsb
)) {
4538 pr_err("Cannot read from %s\n", devname
);
4539 continue; /* Cannot read */
4541 if (memcmp(bsb
.magic
, "md_backup_data-1", 16) != 0 &&
4542 memcmp(bsb
.magic
, "md_backup_data-2", 16) != 0) {
4544 pr_err("No backup metadata on %s\n", devname
);
4547 if (bsb
.sb_csum
!= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
))) {
4549 pr_err("Bad backup-metadata checksum on %s\n", devname
);
4550 continue; /* bad checksum */
4552 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0 &&
4553 bsb
.sb_csum2
!= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum2
)-((char*)&bsb
))) {
4555 pr_err("Bad backup-metadata checksum2 on %s\n", devname
);
4556 continue; /* Bad second checksum */
4558 if (memcmp(bsb
.set_uuid
,info
->uuid
, 16) != 0) {
4560 pr_err("Wrong uuid on backup-metadata on %s\n", devname
);
4561 continue; /* Wrong uuid */
4564 /* array utime and backup-mtime should be updated at much the same time, but it seems that
4565 * sometimes they aren't... So allow considerable flexability in matching, and allow
4566 * this test to be overridden by an environment variable.
4568 if(time_after(info
->array
.utime
, (unsigned int)__le64_to_cpu(bsb
.mtime
) + 2*60*60) ||
4569 time_before(info
->array
.utime
, (unsigned int)__le64_to_cpu(bsb
.mtime
) - 10*60)) {
4570 if (check_env("MDADM_GROW_ALLOW_OLD")) {
4571 pr_err("accepting backup with timestamp %lu for array with timestamp %lu\n",
4572 (unsigned long)__le64_to_cpu(bsb
.mtime
),
4573 (unsigned long)info
->array
.utime
);
4575 pr_err("too-old timestamp on backup-metadata on %s\n", devname
);
4576 pr_err("If you think it is should be safe, try 'export MDADM_GROW_ALLOW_OLD=1'\n");
4577 continue; /* time stamp is too bad */
4581 if (bsb
.magic
[15] == '1') {
4582 if (bsb
.length
== 0)
4584 if (info
->delta_disks
>= 0) {
4585 /* reshape_progress is increasing */
4586 if (__le64_to_cpu(bsb
.arraystart
)
4587 + __le64_to_cpu(bsb
.length
)
4588 < info
->reshape_progress
) {
4591 pr_err("backup-metadata found on %s but is not needed\n", devname
);
4592 continue; /* No new data here */
4595 /* reshape_progress is decreasing */
4596 if (__le64_to_cpu(bsb
.arraystart
) >=
4597 info
->reshape_progress
)
4598 goto nonew
; /* No new data here */
4601 if (bsb
.length
== 0 && bsb
.length2
== 0)
4603 if (info
->delta_disks
>= 0) {
4604 /* reshape_progress is increasing */
4605 if ((__le64_to_cpu(bsb
.arraystart
)
4606 + __le64_to_cpu(bsb
.length
)
4607 < info
->reshape_progress
)
4609 (__le64_to_cpu(bsb
.arraystart2
)
4610 + __le64_to_cpu(bsb
.length2
)
4611 < info
->reshape_progress
))
4612 goto nonew
; /* No new data here */
4614 /* reshape_progress is decreasing */
4615 if (__le64_to_cpu(bsb
.arraystart
) >=
4616 info
->reshape_progress
&&
4617 __le64_to_cpu(bsb
.arraystart2
) >=
4618 info
->reshape_progress
)
4619 goto nonew
; /* No new data here */
4622 if (lseek64(fd
, __le64_to_cpu(bsb
.devstart
)*512, 0)< 0) {
4625 pr_err("Failed to verify secondary backup-metadata block on %s\n",
4627 continue; /* Cannot seek */
4629 /* There should be a duplicate backup superblock 4k before here */
4630 if (lseek64(fd
, -4096, 1) < 0 ||
4631 read(fd
, &bsb2
, sizeof(bsb2
)) != sizeof(bsb2
))
4632 goto second_fail
; /* Cannot find leading superblock */
4633 if (bsb
.magic
[15] == '1')
4634 bsbsize
= offsetof(struct mdp_backup_super
, pad1
);
4636 bsbsize
= offsetof(struct mdp_backup_super
, pad
);
4637 if (memcmp(&bsb2
, &bsb
, bsbsize
) != 0)
4638 goto second_fail
; /* Cannot find leading superblock */
4640 /* Now need the data offsets for all devices. */
4641 offsets
= xmalloc(sizeof(*offsets
)*info
->array
.raid_disks
);
4642 for(j
=0; j
<info
->array
.raid_disks
; j
++) {
4645 if (st
->ss
->load_super(st
, fdlist
[j
], NULL
))
4646 /* FIXME should be this be an error */
4648 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
4649 st
->ss
->free_super(st
);
4650 offsets
[j
] = dinfo
.data_offset
* 512;
4652 printf("%s: restoring critical section\n", Name
);
4654 if (restore_stripes(fdlist
, offsets
,
4655 info
->array
.raid_disks
,
4659 fd
, __le64_to_cpu(bsb
.devstart
)*512,
4660 __le64_to_cpu(bsb
.arraystart
)*512,
4661 __le64_to_cpu(bsb
.length
)*512, NULL
)) {
4662 /* didn't succeed, so giveup */
4664 pr_err("Error restoring backup from %s\n",
4670 if (bsb
.magic
[15] == '2' &&
4671 restore_stripes(fdlist
, offsets
,
4672 info
->array
.raid_disks
,
4676 fd
, __le64_to_cpu(bsb
.devstart
)*512 +
4677 __le64_to_cpu(bsb
.devstart2
)*512,
4678 __le64_to_cpu(bsb
.arraystart2
)*512,
4679 __le64_to_cpu(bsb
.length2
)*512, NULL
)) {
4680 /* didn't succeed, so giveup */
4682 pr_err("Error restoring second backup from %s\n",
4690 /* Ok, so the data is restored. Let's update those superblocks. */
4694 lo
= __le64_to_cpu(bsb
.arraystart
);
4695 hi
= lo
+ __le64_to_cpu(bsb
.length
);
4697 if (bsb
.magic
[15] == '2' && bsb
.length2
) {
4698 unsigned long long lo1
, hi1
;
4699 lo1
= __le64_to_cpu(bsb
.arraystart2
);
4700 hi1
= lo1
+ __le64_to_cpu(bsb
.length2
);
4704 } else if (lo
< lo1
)
4710 (info
->reshape_progress
< lo
||
4711 info
->reshape_progress
> hi
))
4712 /* backup does not affect reshape_progress*/ ;
4713 else if (info
->delta_disks
>= 0) {
4714 info
->reshape_progress
= __le64_to_cpu(bsb
.arraystart
) +
4715 __le64_to_cpu(bsb
.length
);
4716 if (bsb
.magic
[15] == '2') {
4717 unsigned long long p2
= __le64_to_cpu(bsb
.arraystart2
) +
4718 __le64_to_cpu(bsb
.length2
);
4719 if (p2
> info
->reshape_progress
)
4720 info
->reshape_progress
= p2
;
4723 info
->reshape_progress
= __le64_to_cpu(bsb
.arraystart
);
4724 if (bsb
.magic
[15] == '2') {
4725 unsigned long long p2
= __le64_to_cpu(bsb
.arraystart2
);
4726 if (p2
< info
->reshape_progress
)
4727 info
->reshape_progress
= p2
;
4730 for (j
=0; j
<info
->array
.raid_disks
; j
++) {
4733 if (st
->ss
->load_super(st
, fdlist
[j
], NULL
))
4735 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
4736 dinfo
.reshape_progress
= info
->reshape_progress
;
4737 st
->ss
->update_super(st
, &dinfo
,
4738 "_reshape_progress",
4740 st
->ss
->store_super(st
, fdlist
[j
]);
4741 st
->ss
->free_super(st
);
4745 /* Didn't find any backup data, try to see if any
4748 if (info
->delta_disks
< 0) {
4749 /* When shrinking, the critical section is at the end.
4750 * So see if we are before the critical section.
4752 unsigned long long first_block
;
4753 nstripe
= ostripe
= 0;
4755 while (ostripe
>= nstripe
) {
4756 ostripe
+= info
->array
.chunk_size
/ 512;
4757 first_block
= ostripe
* odata
;
4758 nstripe
= first_block
/ ndata
/ (info
->new_chunk
/512) *
4759 (info
->new_chunk
/512);
4762 if (info
->reshape_progress
>= first_block
)
4765 if (info
->delta_disks
> 0) {
4766 /* See if we are beyond the critical section. */
4767 unsigned long long last_block
;
4768 nstripe
= ostripe
= 0;
4770 while (nstripe
>= ostripe
) {
4771 nstripe
+= info
->new_chunk
/ 512;
4772 last_block
= nstripe
* ndata
;
4773 ostripe
= last_block
/ odata
/ (info
->array
.chunk_size
/512) *
4774 (info
->array
.chunk_size
/512);
4777 if (info
->reshape_progress
>= last_block
)
4780 /* needed to recover critical section! */
4782 pr_err("Failed to find backup of critical section\n");
4786 int Grow_continue_command(char *devname
, int fd
,
4787 char *backup_file
, int verbose
)
4790 struct supertype
*st
= NULL
;
4791 struct mdinfo
*content
= NULL
;
4792 struct mdinfo array
;
4793 char *subarray
= NULL
;
4794 struct mdinfo
*cc
= NULL
;
4795 struct mdstat_ent
*mdstat
= NULL
;
4799 dprintf("Grow continue from command line called for %s\n",
4802 st
= super_by_fd(fd
, &subarray
);
4803 if (!st
|| !st
->ss
) {
4804 pr_err("Unable to determine metadata format for %s\n",
4808 dprintf("Grow continue is run for ");
4809 if (st
->ss
->external
== 0) {
4812 dprintf_cont("native array (%s)\n", devname
);
4813 if (ioctl(fd
, GET_ARRAY_INFO
, &array
.array
) < 0) {
4814 pr_err("%s is not an active md array - aborting\n", devname
);
4816 goto Grow_continue_command_exit
;
4819 /* Need to load a superblock.
4820 * FIXME we should really get what we need from
4824 for (d
= 0; d
< MAX_DISKS
; d
++) {
4825 mdu_disk_info_t disk
;
4829 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
4831 if (disk
.major
== 0 && disk
.minor
== 0)
4833 if ((disk
.state
& (1 << MD_DISK_ACTIVE
)) == 0)
4835 dv
= map_dev(disk
.major
, disk
.minor
, 1);
4838 fd2
= dev_open(dv
, O_RDONLY
);
4841 err
= st
->ss
->load_super(st
, fd2
, NULL
);
4847 if (d
== MAX_DISKS
) {
4848 pr_err("Unable to load metadata for %s\n",
4851 goto Grow_continue_command_exit
;
4853 st
->ss
->getinfo_super(st
, content
, NULL
);
4854 if (!content
->reshape_active
)
4858 } while (cnt
-- > 0);
4863 dprintf_cont("subarray (%s)\n", subarray
);
4864 container
= st
->container_devnm
;
4865 cfd
= open_dev_excl(st
->container_devnm
);
4867 container
= st
->devnm
;
4869 cfd
= open_dev_excl(st
->devnm
);
4870 dprintf_cont("container (%s)\n", container
);
4874 pr_err("Unable to open container for %s\n", devname
);
4876 goto Grow_continue_command_exit
;
4879 /* find in container array under reshape
4881 ret_val
= st
->ss
->load_container(st
, cfd
, NULL
);
4883 pr_err("Cannot read superblock for %s\n",
4886 goto Grow_continue_command_exit
;
4889 cc
= st
->ss
->container_content(st
, subarray
);
4890 for (content
= cc
; content
; content
= content
->next
) {
4892 int allow_reshape
= 1;
4894 if (content
->reshape_active
== 0)
4896 /* The decision about array or container wide
4897 * reshape is taken in Grow_continue based
4898 * content->reshape_active state, therefore we
4899 * need to check_reshape based on
4900 * reshape_active and subarray name
4902 if (content
->array
.state
& (1<<MD_SB_BLOCK_VOLUME
))
4904 if (content
->reshape_active
== CONTAINER_RESHAPE
&&
4905 (content
->array
.state
4906 & (1<<MD_SB_BLOCK_CONTAINER_RESHAPE
)))
4909 if (!allow_reshape
) {
4910 pr_err("cannot continue reshape of an array in container with unsupported metadata: %s(%s)\n",
4911 devname
, container
);
4913 goto Grow_continue_command_exit
;
4916 array
= strchr(content
->text_version
+1, '/')+1;
4917 mdstat
= mdstat_by_subdev(array
, container
);
4920 if (mdstat
->active
== 0) {
4921 pr_err("Skipping inactive array %s.\n",
4923 free_mdstat(mdstat
);
4930 pr_err("Unable to determine reshaped array for %s\n", devname
);
4932 goto Grow_continue_command_exit
;
4934 fd2
= open_dev(mdstat
->devnm
);
4936 pr_err("cannot open (%s)\n", mdstat
->devnm
);
4938 goto Grow_continue_command_exit
;
4941 sysfs_init(content
, fd2
, mdstat
->devnm
);
4945 /* start mdmon in case it is not running
4947 if (!mdmon_running(container
))
4948 start_mdmon(container
);
4949 ping_monitor(container
);
4951 if (mdmon_running(container
))
4952 st
->update_tail
= &st
->updates
;
4954 pr_err("No mdmon found. Grow cannot continue.\n");
4956 goto Grow_continue_command_exit
;
4960 /* verify that array under reshape is started from
4963 if (verify_reshape_position(content
, content
->array
.level
) < 0) {
4965 goto Grow_continue_command_exit
;
4970 ret_val
= Grow_continue(fd
, st
, content
, backup_file
, 1, 0);
4972 Grow_continue_command_exit
:
4975 st
->ss
->free_super(st
);
4976 free_mdstat(mdstat
);
4983 int Grow_continue(int mdfd
, struct supertype
*st
, struct mdinfo
*info
,
4984 char *backup_file
, int forked
, int freeze_reshape
)
4988 if (!info
->reshape_active
)
4991 if (st
->ss
->external
) {
4992 int cfd
= open_dev(st
->container_devnm
);
4997 st
->ss
->load_container(st
, cfd
, st
->container_devnm
);
4999 ret_val
= reshape_container(st
->container_devnm
, NULL
, mdfd
,
5000 st
, info
, 0, backup_file
,
5002 1 | info
->reshape_active
,
5005 ret_val
= reshape_array(NULL
, mdfd
, "array", st
, info
, 1,
5006 NULL
, INVALID_SECTORS
,
5007 backup_file
, 0, forked
,
5008 1 | info
->reshape_active
,
5014 char *make_backup(char *name
)
5016 char *base
= "backup_file-";
5020 len
= strlen(MAP_DIR
) + 1 + strlen(base
) + strlen(name
)+1;
5021 fname
= xmalloc(len
);
5022 sprintf(fname
, "%s/%s%s", MAP_DIR
, base
, name
);
5026 char *locate_backup(char *name
)
5028 char *fl
= make_backup(name
);
5031 if (stat(fl
, &stb
) == 0 &&
5032 S_ISREG(stb
.st_mode
))