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 (md_get_array_info(fd
, &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
);
148 if (!fstat_is_blkdev(nfd
, newdev
, &rdev
)) {
153 /* now check out all the devices and make sure we can read the
155 for (d
=0 ; d
< info
.array
.raid_disks
; d
++) {
156 mdu_disk_info_t disk
;
159 st
->ss
->free_super(st
);
162 if (md_get_disk_info(fd
, &disk
) < 0) {
163 pr_err("cannot get device detail for device %d\n",
169 dv
= map_dev(disk
.major
, disk
.minor
, 1);
171 pr_err("cannot find device file for device %d\n",
177 fd2
= dev_open(dv
, O_RDWR
);
179 pr_err("cannot open device file %s\n", dv
);
185 if (st
->ss
->load_super(st
, fd2
, NULL
)) {
186 pr_err("cannot find super block on %s\n", dv
);
194 /* Ok, looks good. Lets update the superblock and write it out to
198 info
.disk
.number
= d
;
199 info
.disk
.major
= major(rdev
);
200 info
.disk
.minor
= minor(rdev
);
201 info
.disk
.raid_disk
= d
;
202 info
.disk
.state
= (1 << MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
);
203 st
->ss
->update_super(st
, &info
, "linear-grow-new", newdev
,
206 if (st
->ss
->store_super(st
, nfd
)) {
207 pr_err("Cannot store new superblock on %s\n",
214 if (ioctl(fd
, ADD_NEW_DISK
, &info
.disk
) != 0) {
215 pr_err("Cannot add new disk to this array\n");
218 /* Well, that seems to have worked.
219 * Now go through and update all superblocks
222 if (md_get_array_info(fd
, &info
.array
) < 0) {
223 pr_err("cannot get array info for %s\n", devname
);
228 for (d
=0 ; d
< info
.array
.raid_disks
; d
++) {
229 mdu_disk_info_t disk
;
233 if (md_get_disk_info(fd
, &disk
) < 0) {
234 pr_err("cannot get device detail for device %d\n",
238 dv
= map_dev(disk
.major
, disk
.minor
, 1);
240 pr_err("cannot find device file for device %d\n",
244 fd2
= dev_open(dv
, O_RDWR
);
246 pr_err("cannot open device file %s\n", dv
);
249 if (st
->ss
->load_super(st
, fd2
, NULL
)) {
250 pr_err("cannot find super block on %s\n", dv
);
254 info
.array
.raid_disks
= nd
+1;
255 info
.array
.nr_disks
= nd
+1;
256 info
.array
.active_disks
= nd
+1;
257 info
.array
.working_disks
= nd
+1;
259 st
->ss
->update_super(st
, &info
, "linear-grow-update", dv
,
262 if (st
->ss
->store_super(st
, fd2
)) {
263 pr_err("Cannot store new superblock on %s\n", dv
);
273 int Grow_addbitmap(char *devname
, int fd
, struct context
*c
, struct shape
*s
)
276 * First check that array doesn't have a bitmap
277 * Then create the bitmap
280 * For internal bitmaps, we need to check the version,
281 * find all the active devices, and write the bitmap block
284 mdu_bitmap_file_t bmf
;
285 mdu_array_info_t array
;
286 struct supertype
*st
;
287 char *subarray
= NULL
;
288 int major
= BITMAP_MAJOR_HI
;
289 unsigned long long bitmapsize
, array_size
;
293 * We only ever get called if s->bitmap_file is != NULL, so this check
294 * is just here to quiet down static code checkers.
299 if (strcmp(s
->bitmap_file
, "clustered") == 0)
300 major
= BITMAP_MAJOR_CLUSTERED
;
302 if (ioctl(fd
, GET_BITMAP_FILE
, &bmf
) != 0) {
304 pr_err("Memory allocation failure.\n");
306 pr_err("bitmaps not supported by this kernel.\n");
309 if (bmf
.pathname
[0]) {
310 if (strcmp(s
->bitmap_file
,"none") == 0) {
311 if (ioctl(fd
, SET_BITMAP_FILE
, -1) != 0) {
312 pr_err("failed to remove bitmap %s\n",
318 pr_err("%s already has a bitmap (%s)\n",
319 devname
, bmf
.pathname
);
322 if (md_get_array_info(fd
, &array
) != 0) {
323 pr_err("cannot get array status for %s\n", devname
);
326 if (array
.state
& (1 << MD_SB_BITMAP_PRESENT
)) {
327 if (strcmp(s
->bitmap_file
, "none")==0) {
328 array
.state
&= ~(1 << MD_SB_BITMAP_PRESENT
);
329 if (md_set_array_info(fd
, &array
) != 0) {
330 if (array
.state
& (1 << MD_SB_CLUSTERED
))
331 pr_err("failed to remove clustered bitmap.\n");
333 pr_err("failed to remove internal bitmap.\n");
338 pr_err("bitmap already present on %s\n", devname
);
342 if (strcmp(s
->bitmap_file
, "none") == 0) {
343 pr_err("no bitmap found on %s\n", devname
);
346 if (array
.level
<= 0) {
347 pr_err("Bitmaps not meaningful with level %s\n",
348 map_num(pers
, array
.level
)?:"of this array");
351 bitmapsize
= array
.size
;
353 if (get_dev_size(fd
, NULL
, &array_size
) &&
354 array_size
> (0x7fffffffULL
<< 9)) {
355 /* Array is big enough that we cannot trust array.size
356 * try other approaches
358 bitmapsize
= get_component_size(fd
);
360 if (bitmapsize
== 0) {
361 pr_err("Cannot reliably determine size of array to create bitmap - sorry.\n");
365 if (array
.level
== 10) {
368 ncopies
= (array
.layout
& 255) * ((array
.layout
>> 8) & 255);
369 bitmapsize
= bitmapsize
* array
.raid_disks
/ ncopies
;
372 st
= super_by_fd(fd
, &subarray
);
374 pr_err("Cannot understand version %d.%d\n",
375 array
.major_version
, array
.minor_version
);
379 pr_err("Cannot add bitmaps to sub-arrays yet\n");
385 mdi
= sysfs_read(fd
, NULL
, GET_CONSISTENCY_POLICY
);
387 if (mdi
->consistency_policy
== CONSISTENCY_POLICY_PPL
) {
388 pr_err("Cannot add bitmap to array with PPL\n");
396 if (strcmp(s
->bitmap_file
, "internal") == 0 ||
397 strcmp(s
->bitmap_file
, "clustered") == 0) {
400 int offset_setable
= 0;
401 if (st
->ss
->add_internal_bitmap
== NULL
) {
402 pr_err("Internal bitmaps not supported with %s metadata\n", st
->ss
->name
);
405 st
->nodes
= c
->nodes
;
406 st
->cluster_name
= c
->homecluster
;
407 mdi
= sysfs_read(fd
, NULL
, GET_BITMAP_LOCATION
);
410 for (d
= 0; d
< st
->max_devs
; d
++) {
411 mdu_disk_info_t disk
;
416 if (md_get_disk_info(fd
, &disk
) < 0)
418 if (disk
.major
== 0 && disk
.minor
== 0)
420 if ((disk
.state
& (1 << MD_DISK_SYNC
)) == 0)
422 dv
= map_dev(disk
.major
, disk
.minor
, 1);
425 fd2
= dev_open(dv
, O_RDWR
);
428 rv
= st
->ss
->load_super(st
, fd2
, NULL
);
430 rv
= st
->ss
->add_internal_bitmap(
431 st
, &s
->bitmap_chunk
, c
->delay
,
432 s
->write_behind
, bitmapsize
,
433 offset_setable
, major
);
435 st
->ss
->write_bitmap(st
, fd2
,
438 pr_err("failed to create internal bitmap - chunksize problem.\n");
441 pr_err("failed to load super-block.\n");
447 if (offset_setable
) {
448 st
->ss
->getinfo_super(st
, mdi
, NULL
);
449 if (sysfs_init(mdi
, fd
, NULL
)) {
450 pr_err("failed to intialize sysfs.\n");
453 rv
= sysfs_set_num_signed(mdi
, NULL
, "bitmap/location",
457 if (strcmp(s
->bitmap_file
, "clustered") == 0)
458 array
.state
|= (1 << MD_SB_CLUSTERED
);
459 array
.state
|= (1 << MD_SB_BITMAP_PRESENT
);
460 rv
= md_set_array_info(fd
, &array
);
464 pr_err("Cannot add bitmap while array is resyncing or reshaping etc.\n");
465 pr_err("failed to set internal bitmap.\n");
472 int max_devs
= st
->max_devs
;
474 /* try to load a superblock */
475 for (d
= 0; d
< max_devs
; d
++) {
476 mdu_disk_info_t disk
;
480 if (md_get_disk_info(fd
, &disk
) < 0)
482 if ((disk
.major
==0 && disk
.minor
== 0) ||
483 (disk
.state
& (1 << MD_DISK_REMOVED
)))
485 dv
= map_dev(disk
.major
, disk
.minor
, 1);
488 fd2
= dev_open(dv
, O_RDONLY
);
490 if (st
->ss
->load_super(st
, fd2
, NULL
) == 0) {
492 st
->ss
->uuid_from_super(st
, uuid
);
499 pr_err("cannot find UUID for array!\n");
502 if (CreateBitmap(s
->bitmap_file
, c
->force
, (char*)uuid
,
503 s
->bitmap_chunk
, c
->delay
, s
->write_behind
,
504 bitmapsize
, major
)) {
507 bitmap_fd
= open(s
->bitmap_file
, O_RDWR
);
509 pr_err("weird: %s cannot be opened\n", s
->bitmap_file
);
512 if (ioctl(fd
, SET_BITMAP_FILE
, bitmap_fd
) < 0) {
515 pr_err("Cannot add bitmap while array is resyncing or reshaping etc.\n");
516 pr_err("Cannot set bitmap file for %s: %s\n",
517 devname
, strerror(err
));
525 int Grow_consistency_policy(char *devname
, int fd
, struct context
*c
, struct shape
*s
)
527 struct supertype
*st
;
530 char *subarray
= NULL
;
532 char container_dev
[PATH_MAX
];
534 if (s
->consistency_policy
!= CONSISTENCY_POLICY_RESYNC
&&
535 s
->consistency_policy
!= CONSISTENCY_POLICY_PPL
) {
536 pr_err("Operation not supported for consistency policy %s\n",
537 map_num(consistency_policies
, s
->consistency_policy
));
541 st
= super_by_fd(fd
, &subarray
);
545 sra
= sysfs_read(fd
, NULL
, GET_CONSISTENCY_POLICY
|GET_LEVEL
|
552 if (s
->consistency_policy
== CONSISTENCY_POLICY_PPL
&&
553 !st
->ss
->write_init_ppl
) {
554 pr_err("%s metadata does not support PPL\n", st
->ss
->name
);
559 if (sra
->array
.level
!= 5) {
560 pr_err("Operation not supported for array level %d\n",
566 if (sra
->consistency_policy
== (unsigned)s
->consistency_policy
) {
567 pr_err("Consistency policy is already %s\n",
568 map_num(consistency_policies
, s
->consistency_policy
));
571 } else if (sra
->consistency_policy
!= CONSISTENCY_POLICY_RESYNC
&&
572 sra
->consistency_policy
!= CONSISTENCY_POLICY_PPL
) {
573 pr_err("Current consistency policy is %s, cannot change to %s\n",
574 map_num(consistency_policies
, sra
->consistency_policy
),
575 map_num(consistency_policies
, s
->consistency_policy
));
583 if (s
->consistency_policy
== CONSISTENCY_POLICY_PPL
)
588 sprintf(container_dev
, "/dev/%s", st
->container_devnm
);
590 ret
= Update_subarray(container_dev
, subarray
, update
, NULL
,
596 if (s
->consistency_policy
== CONSISTENCY_POLICY_PPL
) {
603 cfd
= open(container_dev
, O_RDWR
|O_EXCL
);
605 pr_err("Failed to open %s\n", container_dev
);
610 ret
= st
->ss
->load_container(st
, cfd
, st
->container_devnm
);
614 pr_err("Cannot read superblock for %s\n",
619 mdi
= st
->ss
->container_content(st
, subarray
);
624 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
628 if ((sd
->disk
.state
& (1 << MD_DISK_SYNC
)) == 0)
631 devpath
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 0);
632 dfd
= dev_open(devpath
, O_RDWR
);
634 pr_err("Failed to open %s\n", devpath
);
640 ret
= st
->ss
->load_super(st
, dfd
, NULL
);
642 pr_err("Failed to load super-block.\n");
647 ret
= st
->ss
->update_super(st
, sra
, "ppl", devname
,
648 c
->verbose
, 0, NULL
);
651 st
->ss
->free_super(st
);
654 st
->ss
->getinfo_super(st
, &info
, NULL
);
657 ret
|= sysfs_set_num(sra
, sd
, "ppl_sector", info
.ppl_sector
);
658 ret
|= sysfs_set_num(sra
, sd
, "ppl_size", info
.ppl_size
);
661 pr_err("Failed to set PPL attributes for %s\n",
664 st
->ss
->free_super(st
);
668 ret
= st
->ss
->write_init_ppl(st
, &info
, dfd
);
670 pr_err("Failed to write PPL\n");
675 st
->ss
->free_super(st
);
682 ret
= sysfs_set_str(sra
, NULL
, "consistency_policy",
683 map_num(consistency_policies
,
684 s
->consistency_policy
));
686 pr_err("Failed to change array consistency policy\n");
698 * When reshaping an array we might need to backup some data.
699 * This is written to all spares with a 'super_block' describing it.
700 * The superblock goes 4K from the end of the used space on the
702 * It if written after the backup is complete.
703 * It has the following structure.
706 static struct mdp_backup_super
{
707 char magic
[16]; /* md_backup_data-1 or -2 */
710 /* start/sizes in 512byte sectors */
711 __u64 devstart
; /* address on backup device/file of data */
714 __u32 sb_csum
; /* csum of preceeding bytes. */
716 __u64 devstart2
; /* offset in to data of second section */
719 __u32 sb_csum2
; /* csum of preceeding bytes. */
721 } __attribute__((aligned(512))) bsb
, bsb2
;
723 static __u32
bsb_csum(char *buf
, int len
)
727 for (i
= 0; i
< len
; i
++)
728 csum
= (csum
<<3) + buf
[0];
729 return __cpu_to_le32(csum
);
732 static int check_idle(struct supertype
*st
)
734 /* Check that all member arrays for this container, or the
735 * container of this array, are idle
737 char *container
= (st
->container_devnm
[0]
738 ? st
->container_devnm
: st
->devnm
);
739 struct mdstat_ent
*ent
, *e
;
742 ent
= mdstat_read(0, 0);
743 for (e
= ent
; e
; e
= e
->next
) {
744 if (!is_container_member(e
, container
))
746 if (e
->percent
>= 0) {
755 static int freeze_container(struct supertype
*st
)
757 char *container
= (st
->container_devnm
[0]
758 ? st
->container_devnm
: st
->devnm
);
763 if (block_monitor(container
, 1)) {
764 pr_err("failed to freeze container\n");
771 static void unfreeze_container(struct supertype
*st
)
773 char *container
= (st
->container_devnm
[0]
774 ? st
->container_devnm
: st
->devnm
);
776 unblock_monitor(container
, 1);
779 static int freeze(struct supertype
*st
)
781 /* Try to freeze resync/rebuild on this array/container.
782 * Return -1 if the array is busy,
783 * return -2 container cannot be frozen,
784 * return 0 if this kernel doesn't support 'frozen'
785 * return 1 if it worked.
787 if (st
->ss
->external
)
788 return freeze_container(st
);
790 struct mdinfo
*sra
= sysfs_read(-1, st
->devnm
, GET_VERSION
);
796 /* Need to clear any 'read-auto' status */
797 if (sysfs_get_str(sra
, NULL
, "array_state", buf
, 20) > 0 &&
798 strncmp(buf
, "read-auto", 9) == 0)
799 sysfs_set_str(sra
, NULL
, "array_state", "clean");
801 err
= sysfs_freeze_array(sra
);
807 static void unfreeze(struct supertype
*st
)
809 if (st
->ss
->external
)
810 return unfreeze_container(st
);
812 struct mdinfo
*sra
= sysfs_read(-1, st
->devnm
, GET_VERSION
);
816 sysfs_get_str(sra
, NULL
, "sync_action", buf
, 20) > 0 &&
817 strcmp(buf
, "frozen\n") == 0)
818 sysfs_set_str(sra
, NULL
, "sync_action", "idle");
823 static void wait_reshape(struct mdinfo
*sra
)
825 int fd
= sysfs_get_fd(sra
, NULL
, "sync_action");
831 while (sysfs_fd_get_str(fd
, action
, 20) > 0 &&
832 strncmp(action
, "reshape", 7) == 0)
833 sysfs_wait(fd
, NULL
);
837 static int reshape_super(struct supertype
*st
, unsigned long long size
,
838 int level
, int layout
, int chunksize
, int raid_disks
,
839 int delta_disks
, char *backup_file
, char *dev
,
840 int direction
, int verbose
)
842 /* nothing extra to check in the native case */
843 if (!st
->ss
->external
)
845 if (!st
->ss
->reshape_super
||
846 !st
->ss
->manage_reshape
) {
847 pr_err("%s metadata does not support reshape\n",
852 return st
->ss
->reshape_super(st
, size
, level
, layout
, chunksize
,
853 raid_disks
, delta_disks
, backup_file
, dev
,
857 static void sync_metadata(struct supertype
*st
)
859 if (st
->ss
->external
) {
860 if (st
->update_tail
) {
861 flush_metadata_updates(st
);
862 st
->update_tail
= &st
->updates
;
864 st
->ss
->sync_metadata(st
);
868 static int subarray_set_num(char *container
, struct mdinfo
*sra
, char *name
, int n
)
870 /* when dealing with external metadata subarrays we need to be
871 * prepared to handle EAGAIN. The kernel may need to wait for
872 * mdmon to mark the array active so the kernel can handle
873 * allocations/writeback when preparing the reshape action
874 * (md_allow_write()). We temporarily disable safe_mode_delay
875 * to close a race with the array_state going clean before the
876 * next write to raid_disks / stripe_cache_size
881 /* only 'raid_disks' and 'stripe_cache_size' trigger md_allow_write */
883 (strcmp(name
, "raid_disks") != 0 &&
884 strcmp(name
, "stripe_cache_size") != 0))
885 return sysfs_set_num(sra
, NULL
, name
, n
);
887 rc
= sysfs_get_str(sra
, NULL
, "safe_mode_delay", safe
, sizeof(safe
));
890 sysfs_set_num(sra
, NULL
, "safe_mode_delay", 0);
891 rc
= sysfs_set_num(sra
, NULL
, name
, n
);
892 if (rc
< 0 && errno
== EAGAIN
) {
893 ping_monitor(container
);
894 /* if we get EAGAIN here then the monitor is not active
897 rc
= sysfs_set_num(sra
, NULL
, name
, n
);
899 sysfs_set_str(sra
, NULL
, "safe_mode_delay", safe
);
903 int start_reshape(struct mdinfo
*sra
, int already_running
,
904 int before_data_disks
, int data_disks
)
907 unsigned long long sync_max_to_set
;
909 sysfs_set_num(sra
, NULL
, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL
);
910 err
= sysfs_set_num(sra
, NULL
, "suspend_hi", sra
->reshape_progress
);
911 err
= err
?: sysfs_set_num(sra
, NULL
, "suspend_lo",
912 sra
->reshape_progress
);
913 if (before_data_disks
<= data_disks
)
914 sync_max_to_set
= sra
->reshape_progress
/ data_disks
;
916 sync_max_to_set
= (sra
->component_size
* data_disks
917 - sra
->reshape_progress
) / data_disks
;
918 if (!already_running
)
919 sysfs_set_num(sra
, NULL
, "sync_min", sync_max_to_set
);
920 err
= err
?: sysfs_set_num(sra
, NULL
, "sync_max", sync_max_to_set
);
921 if (!already_running
&& err
== 0) {
924 err
= sysfs_set_str(sra
, NULL
, "sync_action", "reshape");
927 } while (err
&& errno
== EBUSY
&& cnt
-- > 0);
932 void abort_reshape(struct mdinfo
*sra
)
934 sysfs_set_str(sra
, NULL
, "sync_action", "idle");
936 * Prior to kernel commit: 23ddff3792f6 ("md: allow suspend_lo and
937 * suspend_hi to decrease as well as increase.")
938 * you could only increase suspend_{lo,hi} unless the region they
939 * covered was empty. So to reset to 0, you need to push suspend_lo
940 * up past suspend_hi first. So to maximize the chance of mdadm
941 * working on all kernels, we want to keep doing that.
943 sysfs_set_num(sra
, NULL
, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL
);
944 sysfs_set_num(sra
, NULL
, "suspend_hi", 0);
945 sysfs_set_num(sra
, NULL
, "suspend_lo", 0);
946 sysfs_set_num(sra
, NULL
, "sync_min", 0);
947 // It isn't safe to reset sync_max as we aren't monitoring.
948 // Array really should be stopped at this point.
951 int remove_disks_for_takeover(struct supertype
*st
,
956 struct mdinfo
*remaining
;
959 if (st
->ss
->external
) {
961 struct mdinfo
*arrays
= st
->ss
->container_content(st
, NULL
);
963 * containter_content returns list of arrays in container
964 * If arrays->next is not NULL it means that there are
965 * 2 arrays in container and operation should be blocked
972 pr_err("Error. Cannot perform operation on /dev/%s\n", st
->devnm
);
973 pr_err("For this operation it MUST be single array in container\n");
979 if (sra
->array
.level
== 10)
980 nr_of_copies
= layout
& 0xff;
981 else if (sra
->array
.level
== 1)
982 nr_of_copies
= sra
->array
.raid_disks
;
986 remaining
= sra
->devs
;
988 /* for each 'copy', select one device and remove from the list. */
989 for (slot
= 0; slot
< sra
->array
.raid_disks
; slot
+= nr_of_copies
) {
990 struct mdinfo
**diskp
;
993 /* Find a working device to keep */
994 for (diskp
= &remaining
; *diskp
; diskp
= &(*diskp
)->next
) {
995 struct mdinfo
*disk
= *diskp
;
997 if (disk
->disk
.raid_disk
< slot
)
999 if (disk
->disk
.raid_disk
>= slot
+ nr_of_copies
)
1001 if (disk
->disk
.state
& (1<<MD_DISK_REMOVED
))
1003 if (disk
->disk
.state
& (1<<MD_DISK_FAULTY
))
1005 if (!(disk
->disk
.state
& (1<<MD_DISK_SYNC
)))
1008 /* We have found a good disk to use! */
1009 *diskp
= disk
->next
;
1010 disk
->next
= sra
->devs
;
1019 if (slot
< sra
->array
.raid_disks
) {
1020 /* didn't find all slots */
1026 sra
->devs
= remaining
;
1030 /* Remove all 'remaining' devices from the array */
1032 struct mdinfo
*sd
= remaining
;
1033 remaining
= sd
->next
;
1035 sysfs_set_str(sra
, sd
, "state", "faulty");
1036 sysfs_set_str(sra
, sd
, "slot", "none");
1037 /* for external metadata disks should be removed in mdmon */
1038 if (!st
->ss
->external
)
1039 sysfs_set_str(sra
, sd
, "state", "remove");
1040 sd
->disk
.state
|= (1<<MD_DISK_REMOVED
);
1041 sd
->disk
.state
&= ~(1<<MD_DISK_SYNC
);
1042 sd
->next
= sra
->devs
;
1048 void reshape_free_fdlist(int *fdlist
,
1049 unsigned long long *offsets
,
1054 for (i
= 0; i
< size
; i
++)
1062 int reshape_prepare_fdlist(char *devname
,
1066 unsigned long blocks
,
1069 unsigned long long *offsets
)
1074 enable_fds(nrdisks
);
1075 for (d
= 0; d
<= nrdisks
; d
++)
1078 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
1079 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
1081 if (sd
->disk
.state
& (1<<MD_DISK_SYNC
) &&
1082 sd
->disk
.raid_disk
< raid_disks
) {
1083 char *dn
= map_dev(sd
->disk
.major
,
1085 fdlist
[sd
->disk
.raid_disk
]
1086 = dev_open(dn
, O_RDONLY
);
1087 offsets
[sd
->disk
.raid_disk
] = sd
->data_offset
*512;
1088 if (fdlist
[sd
->disk
.raid_disk
] < 0) {
1089 pr_err("%s: cannot open component %s\n",
1090 devname
, dn
? dn
: "-unknown-");
1094 } else if (backup_file
== NULL
) {
1096 char *dn
= map_dev(sd
->disk
.major
,
1098 fdlist
[d
] = dev_open(dn
, O_RDWR
);
1099 offsets
[d
] = (sd
->data_offset
+ sra
->component_size
- blocks
- 8)*512;
1100 if (fdlist
[d
] < 0) {
1101 pr_err("%s: cannot open component %s\n",
1102 devname
, dn
? dn
: "-unknown-");
1113 int reshape_open_backup_file(char *backup_file
,
1118 unsigned long long *offsets
,
1122 /* Return 1 on success, 0 on any form of failure */
1123 /* need to check backup file is large enough */
1129 *fdlist
= open(backup_file
, O_RDWR
|O_CREAT
|(restart
? O_TRUNC
: O_EXCL
),
1133 pr_err("%s: cannot create backup file %s: %s\n",
1134 devname
, backup_file
, strerror(errno
));
1137 /* Guard against backup file being on array device.
1138 * If array is partitioned or if LVM etc is in the
1139 * way this will not notice, but it is better than
1142 fstat(*fdlist
, &stb
);
1145 if (stb
.st_rdev
== dev
) {
1146 pr_err("backup file must NOT be on the array being reshaped.\n");
1151 memset(buf
, 0, 512);
1152 for (i
=0; i
< blocks
+ 8 ; i
++) {
1153 if (write(*fdlist
, buf
, 512) != 512) {
1154 pr_err("%s: cannot create backup file %s: %s\n",
1155 devname
, backup_file
, strerror(errno
));
1159 if (fsync(*fdlist
) != 0) {
1160 pr_err("%s: cannot create backup file %s: %s\n",
1161 devname
, backup_file
, strerror(errno
));
1165 if (!restart
&& strncmp(backup_file
, MAP_DIR
, strlen(MAP_DIR
)) != 0) {
1166 char *bu
= make_backup(sys_name
);
1167 if (symlink(backup_file
, bu
))
1168 pr_err("Recording backup file in " MAP_DIR
" failed: %s\n",
1176 unsigned long compute_backup_blocks(int nchunk
, int ochunk
,
1177 unsigned int ndata
, unsigned int odata
)
1179 unsigned long a
, b
, blocks
;
1180 /* So how much do we need to backup.
1181 * We need an amount of data which is both a whole number of
1182 * old stripes and a whole number of new stripes.
1183 * So LCM for (chunksize*datadisks).
1185 a
= (ochunk
/512) * odata
;
1186 b
= (nchunk
/512) * ndata
;
1189 /* LCM == product / GCD */
1190 blocks
= (ochunk
/512) * (nchunk
/512) * odata
* ndata
/ a
;
1195 char *analyse_change(char *devname
, struct mdinfo
*info
, struct reshape
*re
)
1197 /* Based on the current array state in info->array and
1198 * the changes in info->new_* etc, determine:
1199 * - whether the change is possible
1200 * - Intermediate level/raid_disks/layout
1201 * - whether a restriping reshape is needed
1202 * - number of sectors in minimum change unit. This
1203 * will cover a whole number of stripes in 'before' and
1206 * Return message if the change should be rejected
1207 * NULL if the change can be achieved
1209 * This can be called as part of starting a reshape, or
1210 * when assembling an array that is undergoing reshape.
1212 int near
, far
, offset
, copies
;
1214 int old_chunk
, new_chunk
;
1215 /* delta_parity records change in number of devices
1216 * caused by level change
1218 int delta_parity
= 0;
1220 memset(re
, 0, sizeof(*re
));
1222 /* If a new level not explicitly given, we assume no-change */
1223 if (info
->new_level
== UnSet
)
1224 info
->new_level
= info
->array
.level
;
1226 if (info
->new_chunk
)
1227 switch (info
->new_level
) {
1233 /* chunk size is meaningful, must divide component_size
1236 if (info
->component_size
% (info
->new_chunk
/512)) {
1237 unsigned long long shrink
= info
->component_size
;
1238 shrink
&= ~(unsigned long long)(info
->new_chunk
/512-1);
1239 pr_err("New chunk size (%dK) does not evenly divide device size (%lluk)\n",
1240 info
->new_chunk
/1024, info
->component_size
/2);
1241 pr_err("After shrinking any filesystem, \"mdadm --grow %s --size %llu\"\n",
1243 pr_err("will shrink the array so the given chunk size would work.\n");
1248 return "chunk size not meaningful for this level";
1251 info
->new_chunk
= info
->array
.chunk_size
;
1253 switch (info
->array
.level
) {
1255 return "No reshape is possibly for this RAID level";
1257 if (info
->delta_disks
!= UnSet
)
1258 return "Only --add is supported for LINEAR, setting --raid-disks is not needed";
1260 return "Only --add is supported for LINEAR, other --grow options are not meaningful";
1262 /* RAID1 can convert to RAID1 with different disks, or
1263 * raid5 with 2 disks, or
1266 if (info
->new_level
> 1 && (info
->component_size
& 7))
1267 return "Cannot convert RAID1 of this size - reduce size to multiple of 4K first.";
1268 if (info
->new_level
== 0) {
1269 if (info
->delta_disks
!= UnSet
&&
1270 info
->delta_disks
!= 0)
1271 return "Cannot change number of disks with RAID1->RAID0 conversion";
1273 re
->before
.data_disks
= 1;
1274 re
->after
.data_disks
= 1;
1277 if (info
->new_level
== 1) {
1278 if (info
->delta_disks
== UnSet
)
1279 /* Don't know what to do */
1280 return "no change requested for Growing RAID1";
1284 if (info
->array
.raid_disks
!= 2 && info
->new_level
== 5)
1285 return "Can only convert a 2-device array to RAID5";
1286 if (info
->array
.raid_disks
== 2 && info
->new_level
== 5) {
1288 re
->before
.data_disks
= 1;
1289 if (info
->delta_disks
!= UnSet
&&
1290 info
->delta_disks
!= 0)
1291 re
->after
.data_disks
= 1 + info
->delta_disks
;
1293 re
->after
.data_disks
= 1;
1294 if (re
->after
.data_disks
< 1)
1295 return "Number of disks too small for RAID5";
1297 re
->before
.layout
= ALGORITHM_LEFT_SYMMETRIC
;
1298 info
->array
.chunk_size
= 65536;
1301 /* Could do some multi-stage conversions, but leave that to
1304 return "Impossibly level change request for RAID1";
1307 /* RAID10 can be converted from near mode to
1308 * RAID0 by removing some devices.
1309 * It can also be reshaped if the kernel supports
1312 switch (info
->new_level
) {
1314 if ((info
->array
.layout
& ~0xff) != 0x100)
1315 return "Cannot Grow RAID10 with far/offset layout";
1316 /* number of devices must be multiple of number of copies */
1317 if (info
->array
.raid_disks
% (info
->array
.layout
& 0xff))
1318 return "RAID10 layout too complex for Grow operation";
1320 new_disks
= (info
->array
.raid_disks
1321 / (info
->array
.layout
& 0xff));
1322 if (info
->delta_disks
== UnSet
)
1323 info
->delta_disks
= (new_disks
1324 - info
->array
.raid_disks
);
1326 if (info
->delta_disks
!= new_disks
- info
->array
.raid_disks
)
1327 return "New number of raid-devices impossible for RAID10";
1328 if (info
->new_chunk
&&
1329 info
->new_chunk
!= info
->array
.chunk_size
)
1330 return "Cannot change chunk-size with RAID10 Grow";
1334 re
->before
.data_disks
= new_disks
;
1335 re
->after
.data_disks
= re
->before
.data_disks
;
1339 near
= info
->array
.layout
& 0xff;
1340 far
= (info
->array
.layout
>> 8) & 0xff;
1341 offset
= info
->array
.layout
& 0x10000;
1342 if (far
> 1 && !offset
)
1343 return "Cannot reshape RAID10 in far-mode";
1344 copies
= near
* far
;
1346 old_chunk
= info
->array
.chunk_size
* far
;
1348 if (info
->new_layout
== UnSet
)
1349 info
->new_layout
= info
->array
.layout
;
1351 near
= info
->new_layout
& 0xff;
1352 far
= (info
->new_layout
>> 8) & 0xff;
1353 offset
= info
->new_layout
& 0x10000;
1354 if (far
> 1 && !offset
)
1355 return "Cannot reshape RAID10 to far-mode";
1356 if (near
* far
!= copies
)
1357 return "Cannot change number of copies when reshaping RAID10";
1359 if (info
->delta_disks
== UnSet
)
1360 info
->delta_disks
= 0;
1361 new_disks
= (info
->array
.raid_disks
+
1364 new_chunk
= info
->new_chunk
* far
;
1367 re
->before
.layout
= info
->array
.layout
;
1368 re
->before
.data_disks
= info
->array
.raid_disks
;
1369 re
->after
.layout
= info
->new_layout
;
1370 re
->after
.data_disks
= new_disks
;
1371 /* For RAID10 we don't do backup but do allow reshape,
1372 * so set backup_blocks to INVALID_SECTORS rather than
1374 * And there is no need to synchronise stripes on both
1375 * 'old' and 'new'. So the important
1376 * number is the minimum data_offset difference
1377 * which is the larger of (offset copies * chunk).
1379 re
->backup_blocks
= INVALID_SECTORS
;
1380 re
->min_offset_change
= max(old_chunk
, new_chunk
) / 512;
1381 if (new_disks
< re
->before
.data_disks
&&
1382 info
->space_after
< re
->min_offset_change
)
1383 /* Reduce component size by one chunk */
1384 re
->new_size
= (info
->component_size
-
1385 re
->min_offset_change
);
1387 re
->new_size
= info
->component_size
;
1388 re
->new_size
= re
->new_size
* new_disks
/ copies
;
1392 return "RAID10 can only be changed to RAID0";
1395 /* RAID0 can be converted to RAID10, or to RAID456 */
1396 if (info
->new_level
== 10) {
1397 if (info
->new_layout
== UnSet
&&
1398 info
->delta_disks
== UnSet
) {
1399 /* Assume near=2 layout */
1400 info
->new_layout
= 0x102;
1401 info
->delta_disks
= info
->array
.raid_disks
;
1403 if (info
->new_layout
== UnSet
) {
1404 int copies
= 1 + (info
->delta_disks
1405 / info
->array
.raid_disks
);
1406 if (info
->array
.raid_disks
* (copies
-1) !=
1408 return "Impossible number of devices for RAID0->RAID10";
1409 info
->new_layout
= 0x100 + copies
;
1411 if (info
->delta_disks
== UnSet
) {
1412 int copies
= info
->new_layout
& 0xff;
1413 if (info
->new_layout
!= 0x100 + copies
)
1414 return "New layout impossible for RAID0->RAID10";;
1415 info
->delta_disks
= (copies
- 1) *
1416 info
->array
.raid_disks
;
1418 if (info
->new_chunk
&&
1419 info
->new_chunk
!= info
->array
.chunk_size
)
1420 return "Cannot change chunk-size with RAID0->RAID10";
1423 re
->before
.data_disks
= (info
->array
.raid_disks
+
1425 re
->after
.data_disks
= re
->before
.data_disks
;
1426 re
->before
.layout
= info
->new_layout
;
1430 /* RAID0 can also covert to RAID0/4/5/6 by first converting to
1431 * a raid4 style layout of the final level.
1433 switch (info
->new_level
) {
1438 re
->before
.layout
= 0;
1443 re
->before
.layout
= ALGORITHM_PARITY_N
;
1444 if (info
->new_layout
== UnSet
)
1445 info
->new_layout
= map_name(r5layout
, "default");
1450 re
->before
.layout
= ALGORITHM_PARITY_N
;
1451 if (info
->new_layout
== UnSet
)
1452 info
->new_layout
= map_name(r6layout
, "default");
1455 return "Impossible level change requested";
1457 re
->before
.data_disks
= info
->array
.raid_disks
;
1458 /* determining 'after' layout happens outside this 'switch' */
1462 info
->array
.layout
= ALGORITHM_PARITY_N
;
1464 switch (info
->new_level
) {
1468 re
->level
= info
->array
.level
;
1469 re
->before
.data_disks
= info
->array
.raid_disks
- 1;
1470 re
->before
.layout
= info
->array
.layout
;
1474 re
->before
.data_disks
= info
->array
.raid_disks
- 1;
1475 re
->before
.layout
= info
->array
.layout
;
1480 re
->before
.data_disks
= info
->array
.raid_disks
- 1;
1481 switch (info
->array
.layout
) {
1482 case ALGORITHM_LEFT_ASYMMETRIC
:
1483 re
->before
.layout
= ALGORITHM_LEFT_ASYMMETRIC_6
;
1485 case ALGORITHM_RIGHT_ASYMMETRIC
:
1486 re
->before
.layout
= ALGORITHM_RIGHT_ASYMMETRIC_6
;
1488 case ALGORITHM_LEFT_SYMMETRIC
:
1489 re
->before
.layout
= ALGORITHM_LEFT_SYMMETRIC_6
;
1491 case ALGORITHM_RIGHT_SYMMETRIC
:
1492 re
->before
.layout
= ALGORITHM_RIGHT_SYMMETRIC_6
;
1494 case ALGORITHM_PARITY_0
:
1495 re
->before
.layout
= ALGORITHM_PARITY_0_6
;
1497 case ALGORITHM_PARITY_N
:
1498 re
->before
.layout
= ALGORITHM_PARITY_N_6
;
1501 return "Cannot convert an array with this layout";
1505 if (info
->array
.raid_disks
!= 2)
1506 return "Can only convert a 2-device array to RAID1";
1507 if (info
->delta_disks
!= UnSet
&&
1508 info
->delta_disks
!= 0)
1509 return "Cannot set raid_disk when converting RAID5->RAID1";
1511 info
->new_chunk
= 0;
1514 return "Impossible level change requested";
1518 switch (info
->new_level
) {
1524 re
->before
.data_disks
= info
->array
.raid_disks
- 2;
1525 re
->before
.layout
= info
->array
.layout
;
1528 return "Impossible level change requested";
1533 /* If we reached here then it looks like a re-stripe is
1534 * happening. We have determined the intermediate level
1535 * and initial raid_disks/layout and stored these in 're'.
1537 * We need to deduce the final layout that can be atomically
1538 * converted to the end state.
1540 switch (info
->new_level
) {
1542 /* We can only get to RAID0 from RAID4 or RAID5
1543 * with appropriate layout and one extra device
1545 if (re
->level
!= 4 && re
->level
!= 5)
1546 return "Cannot covert to RAID0 from this level";
1548 switch (re
->level
) {
1550 re
->before
.layout
= 0;
1551 re
->after
.layout
= 0;
1554 re
->after
.layout
= ALGORITHM_PARITY_N
;
1560 /* We can only get to RAID4 from RAID5 */
1561 if (re
->level
!= 4 && re
->level
!= 5)
1562 return "Cannot convert to RAID4 from this level";
1564 switch (re
->level
) {
1566 re
->after
.layout
= 0;
1569 re
->after
.layout
= ALGORITHM_PARITY_N
;
1575 /* We get to RAID5 from RAID5 or RAID6 */
1576 if (re
->level
!= 5 && re
->level
!= 6)
1577 return "Cannot convert to RAID5 from this level";
1579 switch (re
->level
) {
1581 if (info
->new_layout
== UnSet
)
1582 re
->after
.layout
= re
->before
.layout
;
1584 re
->after
.layout
= info
->new_layout
;
1587 if (info
->new_layout
== UnSet
)
1588 info
->new_layout
= re
->before
.layout
;
1590 /* after.layout needs to be raid6 version of new_layout */
1591 if (info
->new_layout
== ALGORITHM_PARITY_N
)
1592 re
->after
.layout
= ALGORITHM_PARITY_N
;
1595 char *ls
= map_num(r5layout
, info
->new_layout
);
1598 /* Current RAID6 layout has a RAID5
1601 strcat(strcpy(layout
, ls
), "-6");
1602 l
= map_name(r6layout
, layout
);
1604 return "Cannot find RAID6 layout to convert to";
1606 /* Current RAID6 has no equivalent.
1607 * If it is already a '-6' layout we
1608 * can leave it unchanged, else we must
1611 ls
= map_num(r6layout
, info
->new_layout
);
1613 strcmp(ls
+strlen(ls
)-2, "-6") != 0)
1614 return "Please specify new layout";
1615 l
= info
->new_layout
;
1617 re
->after
.layout
= l
;
1623 /* We must already be at level 6 */
1625 return "Impossible level change";
1626 if (info
->new_layout
== UnSet
)
1627 re
->after
.layout
= info
->array
.layout
;
1629 re
->after
.layout
= info
->new_layout
;
1632 return "Impossible level change requested";
1634 if (info
->delta_disks
== UnSet
)
1635 info
->delta_disks
= delta_parity
;
1637 re
->after
.data_disks
=
1638 (re
->before
.data_disks
+ info
->delta_disks
- delta_parity
);
1640 switch (re
->level
) {
1652 /* So we have a restripe operation, we need to calculate the number
1653 * of blocks per reshape operation.
1655 re
->new_size
= info
->component_size
* re
->before
.data_disks
;
1656 if (info
->new_chunk
== 0)
1657 info
->new_chunk
= info
->array
.chunk_size
;
1658 if (re
->after
.data_disks
== re
->before
.data_disks
&&
1659 re
->after
.layout
== re
->before
.layout
&&
1660 info
->new_chunk
== info
->array
.chunk_size
) {
1661 /* Nothing to change, can change level immediately. */
1662 re
->level
= info
->new_level
;
1663 re
->backup_blocks
= 0;
1666 if (re
->after
.data_disks
== 1 && re
->before
.data_disks
== 1) {
1667 /* chunk and layout changes make no difference */
1668 re
->level
= info
->new_level
;
1669 re
->backup_blocks
= 0;
1673 if (re
->after
.data_disks
== re
->before
.data_disks
&&
1674 get_linux_version() < 2006032)
1675 return "in-place reshape is not safe before 2.6.32 - sorry.";
1677 if (re
->after
.data_disks
< re
->before
.data_disks
&&
1678 get_linux_version() < 2006030)
1679 return "reshape to fewer devices is not supported before 2.6.30 - sorry.";
1681 re
->backup_blocks
= compute_backup_blocks(
1682 info
->new_chunk
, info
->array
.chunk_size
,
1683 re
->after
.data_disks
,
1684 re
->before
.data_disks
);
1685 re
->min_offset_change
= re
->backup_blocks
/ re
->before
.data_disks
;
1687 re
->new_size
= info
->component_size
* re
->after
.data_disks
;
1691 static int set_array_size(struct supertype
*st
, struct mdinfo
*sra
,
1694 struct mdinfo
*info
;
1698 if ((st
== NULL
) || (sra
== NULL
))
1701 if (text_version
== NULL
)
1702 text_version
= sra
->text_version
;
1703 subarray
= strchr(text_version
+ 1, '/')+1;
1704 info
= st
->ss
->container_content(st
, subarray
);
1706 unsigned long long current_size
= 0;
1707 unsigned long long new_size
=
1708 info
->custom_array_size
/2;
1710 if (sysfs_get_ll(sra
, NULL
, "array_size", ¤t_size
) == 0 &&
1711 new_size
> current_size
) {
1712 if (sysfs_set_num(sra
, NULL
, "array_size", new_size
)
1714 dprintf("Error: Cannot set array size");
1717 dprintf("Array size changed");
1719 dprintf_cont(" from %llu to %llu.\n",
1720 current_size
, new_size
);
1724 dprintf("Error: set_array_size(): info pointer in NULL\n");
1729 static int reshape_array(char *container
, int fd
, char *devname
,
1730 struct supertype
*st
, struct mdinfo
*info
,
1731 int force
, struct mddev_dev
*devlist
,
1732 unsigned long long data_offset
,
1733 char *backup_file
, int verbose
, int forked
,
1734 int restart
, int freeze_reshape
);
1735 static int reshape_container(char *container
, char *devname
,
1737 struct supertype
*st
,
1738 struct mdinfo
*info
,
1740 char *backup_file
, int verbose
,
1741 int forked
, int restart
, int freeze_reshape
);
1743 int Grow_reshape(char *devname
, int fd
,
1744 struct mddev_dev
*devlist
,
1745 unsigned long long data_offset
,
1746 struct context
*c
, struct shape
*s
)
1748 /* Make some changes in the shape of an array.
1749 * The kernel must support the change.
1751 * There are three different changes. Each can trigger
1752 * a resync or recovery so we freeze that until we have
1753 * requested everything (if kernel supports freezing - 2.6.30).
1755 * - change size (i.e. component_size)
1757 * - change layout/chunksize/ndisks
1759 * The last can require a reshape. It is different on different
1760 * levels so we need to check the level before actioning it.
1761 * Some times the level change needs to be requested after the
1762 * reshape (e.g. raid6->raid5, raid5->raid0)
1765 struct mdu_array_info_s array
;
1767 struct supertype
*st
;
1768 char *subarray
= NULL
;
1772 char *container
= NULL
;
1775 struct mddev_dev
*dv
;
1781 if (md_get_array_info(fd
, &array
) < 0) {
1782 pr_err("%s is not an active md array - aborting\n",
1786 if (data_offset
!= INVALID_SECTORS
&& array
.level
!= 10 &&
1787 (array
.level
< 4 || array
.level
> 6)) {
1788 pr_err("--grow --data-offset not yet supported\n");
1793 (s
->chunk
|| s
->level
!= UnSet
|| s
->layout_str
|| s
->raiddisks
)) {
1794 pr_err("cannot change component size at the same time as other changes.\n"
1795 " Change size first, then check data is intact before making other changes.\n");
1799 if (s
->raiddisks
&& s
->raiddisks
< array
.raid_disks
&&
1800 array
.level
> 1 && get_linux_version() < 2006032 &&
1801 !check_env("MDADM_FORCE_FEWER")) {
1802 pr_err("reducing the number of devices is not safe before Linux 2.6.32\n"
1803 " Please use a newer kernel\n");
1807 st
= super_by_fd(fd
, &subarray
);
1809 pr_err("Unable to determine metadata format for %s\n", devname
);
1812 if (s
->raiddisks
> st
->max_devs
) {
1813 pr_err("Cannot increase raid-disks on this array beyond %d\n", st
->max_devs
);
1816 if (s
->level
== 0 &&
1817 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)) &&
1818 !(array
.state
& (1<<MD_SB_CLUSTERED
))) {
1819 array
.state
&= ~(1<<MD_SB_BITMAP_PRESENT
);
1820 if (md_set_array_info(fd
, &array
)!= 0) {
1821 pr_err("failed to remove internal bitmap.\n");
1826 /* in the external case we need to check that the requested reshape is
1827 * supported, and perform an initial check that the container holds the
1828 * pre-requisite spare devices (mdmon owns final validation)
1830 if (st
->ss
->external
) {
1834 container
= st
->container_devnm
;
1835 cfd
= open_dev_excl(st
->container_devnm
);
1837 container
= st
->devnm
;
1839 cfd
= open_dev_excl(st
->devnm
);
1843 pr_err("Unable to open container for %s\n",
1849 retval
= st
->ss
->load_container(st
, cfd
, NULL
);
1852 pr_err("Cannot read superblock for %s\n",
1858 /* check if operation is supported for metadata handler */
1859 if (st
->ss
->container_content
) {
1860 struct mdinfo
*cc
= NULL
;
1861 struct mdinfo
*content
= NULL
;
1863 cc
= st
->ss
->container_content(st
, subarray
);
1864 for (content
= cc
; content
; content
= content
->next
) {
1865 int allow_reshape
= 1;
1867 /* check if reshape is allowed based on metadata
1868 * indications stored in content.array.status
1870 if (content
->array
.state
&
1871 (1 << MD_SB_BLOCK_VOLUME
))
1873 if (content
->array
.state
&
1874 (1 << MD_SB_BLOCK_CONTAINER_RESHAPE
))
1876 if (!allow_reshape
) {
1877 pr_err("cannot reshape arrays in container with unsupported metadata: %s(%s)\n",
1878 devname
, container
);
1883 if (content
->consistency_policy
==
1884 CONSISTENCY_POLICY_PPL
) {
1885 pr_err("Operation not supported when ppl consistency policy is enabled\n");
1893 if (mdmon_running(container
))
1894 st
->update_tail
= &st
->updates
;
1898 for (dv
= devlist
; dv
; dv
= dv
->next
)
1900 if (s
->raiddisks
> array
.raid_disks
&&
1901 array
.spare_disks
+ added_disks
< (s
->raiddisks
- array
.raid_disks
) &&
1903 pr_err("Need %d spare%s to avoid degraded array, and only have %d.\n"
1904 " Use --force to over-ride this check.\n",
1905 s
->raiddisks
- array
.raid_disks
,
1906 s
->raiddisks
- array
.raid_disks
== 1 ? "" : "s",
1907 array
.spare_disks
+ added_disks
);
1911 sra
= sysfs_read(fd
, NULL
, GET_LEVEL
| GET_DISKS
| GET_DEVS
|
1912 GET_STATE
| GET_VERSION
);
1914 if (st
->ss
->external
&& subarray
== NULL
) {
1915 array
.level
= LEVEL_CONTAINER
;
1916 sra
->array
.level
= LEVEL_CONTAINER
;
1919 pr_err("failed to read sysfs parameters for %s\n",
1923 frozen
= freeze(st
);
1925 /* freeze() already spewed the reason */
1928 } else if (frozen
< 0) {
1929 pr_err("%s is performing resync/recovery and cannot be reshaped\n", devname
);
1934 /* ========= set size =============== */
1936 (s
->size
== MAX_SIZE
|| s
->size
!= (unsigned)array
.size
)) {
1937 unsigned long long orig_size
= get_component_size(fd
)/2;
1938 unsigned long long min_csize
;
1940 int raid0_takeover
= 0;
1943 orig_size
= (unsigned) array
.size
;
1945 if (orig_size
== 0) {
1946 pr_err("Cannot set device size in this type of array.\n");
1951 if (reshape_super(st
, s
->size
, UnSet
, UnSet
, 0, 0, UnSet
, NULL
,
1952 devname
, APPLY_METADATA_CHANGES
,
1958 if (st
->ss
->external
) {
1959 /* metadata can have size limitation
1960 * update size value according to metadata information
1962 struct mdinfo
*sizeinfo
=
1963 st
->ss
->container_content(st
, subarray
);
1965 unsigned long long new_size
=
1966 sizeinfo
->custom_array_size
/2;
1967 int data_disks
= get_data_disks(
1968 sizeinfo
->array
.level
,
1969 sizeinfo
->array
.layout
,
1970 sizeinfo
->array
.raid_disks
);
1971 new_size
/= data_disks
;
1972 dprintf("Metadata size correction from %llu to %llu (%llu)\n",
1973 orig_size
, new_size
,
1974 new_size
* data_disks
);
1976 sysfs_free(sizeinfo
);
1980 /* Update the size of each member device in case
1981 * they have been resized. This will never reduce
1982 * below the current used-size. The "size" attribute
1983 * understands '0' to mean 'max'.
1986 for (mdi
= sra
->devs
; mdi
; mdi
= mdi
->next
) {
1987 sysfs_set_num(sra
, mdi
, "size", s
->size
== MAX_SIZE
? 0
1989 if (array
.not_persistent
== 0 &&
1990 array
.major_version
== 0 &&
1991 get_linux_version() < 3001000) {
1992 /* Dangerous to allow size to exceed 2TB */
1993 unsigned long long csize
;
1994 if (sysfs_get_ll(sra
, mdi
, "size", &csize
) == 0) {
1995 if (csize
>= 2ULL*1024*1024*1024)
1996 csize
= 2ULL*1024*1024*1024;
1997 if ((min_csize
== 0 || (min_csize
2003 if (min_csize
&& s
->size
> min_csize
) {
2004 pr_err("Cannot safely make this array use more than 2TB per device on this kernel.\n");
2006 goto size_change_error
;
2008 if (min_csize
&& s
->size
== MAX_SIZE
) {
2009 /* Don't let the kernel choose a size - it will get
2012 pr_err("Limited v0.90 array to 2TB per device\n");
2013 s
->size
= min_csize
;
2015 if (st
->ss
->external
) {
2016 if (sra
->array
.level
== 0) {
2017 rv
= sysfs_set_str(sra
, NULL
, "level",
2021 /* get array parameters after takeover
2022 * to change one parameter at time only
2024 rv
= md_get_array_info(fd
, &array
);
2027 /* make sure mdmon is
2028 * aware of the new level */
2029 if (!mdmon_running(st
->container_devnm
))
2030 start_mdmon(st
->container_devnm
);
2031 ping_monitor(container
);
2032 if (mdmon_running(st
->container_devnm
) &&
2033 st
->update_tail
== NULL
)
2034 st
->update_tail
= &st
->updates
;
2037 if (s
->size
== MAX_SIZE
)
2039 array
.size
= s
->size
;
2040 if (s
->size
& ~INT32_MAX
) {
2041 /* got truncated to 32bit, write to
2042 * component_size instead
2045 rv
= sysfs_set_num(sra
, NULL
,
2046 "component_size", s
->size
);
2050 rv
= md_set_array_info(fd
, &array
);
2052 /* manage array size when it is managed externally
2054 if ((rv
== 0) && st
->ss
->external
)
2055 rv
= set_array_size(st
, sra
, sra
->text_version
);
2058 if (raid0_takeover
) {
2059 /* do not recync non-existing parity,
2060 * we will drop it anyway
2062 sysfs_set_str(sra
, NULL
, "sync_action", "frozen");
2063 /* go back to raid0, drop parity disk
2065 sysfs_set_str(sra
, NULL
, "level", "raid0");
2066 md_get_array_info(fd
, &array
);
2073 /* restore metadata */
2074 if (reshape_super(st
, orig_size
, UnSet
, UnSet
, 0, 0,
2075 UnSet
, NULL
, devname
,
2076 ROLLBACK_METADATA_CHANGES
,
2079 pr_err("Cannot set device size for %s: %s\n",
2080 devname
, strerror(err
));
2082 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2083 cont_err("Bitmap must be removed before size can be changed\n");
2087 if (s
->assume_clean
) {
2088 /* This will fail on kernels older than 3.0 unless
2089 * a backport has been arranged.
2092 sysfs_set_str(sra
, NULL
, "resync_start", "none") < 0)
2093 pr_err("--assume-clean not supported with --grow on this kernel\n");
2095 md_get_array_info(fd
, &array
);
2096 s
->size
= get_component_size(fd
)/2;
2098 s
->size
= array
.size
;
2099 if (c
->verbose
>= 0) {
2100 if (s
->size
== orig_size
)
2101 pr_err("component size of %s unchanged at %lluK\n",
2104 pr_err("component size of %s has been set to %lluK\n",
2108 } else if (array
.level
!= LEVEL_CONTAINER
) {
2109 s
->size
= get_component_size(fd
)/2;
2111 s
->size
= array
.size
;
2114 /* See if there is anything else to do */
2115 if ((s
->level
== UnSet
|| s
->level
== array
.level
) &&
2116 (s
->layout_str
== NULL
) &&
2117 (s
->chunk
== 0 || s
->chunk
== array
.chunk_size
) &&
2118 data_offset
== INVALID_SECTORS
&&
2119 (s
->raiddisks
== 0 || s
->raiddisks
== array
.raid_disks
)) {
2120 /* Nothing more to do */
2121 if (!changed
&& c
->verbose
>= 0)
2122 pr_err("%s: no change requested\n",
2127 /* ========= check for Raid10/Raid1 -> Raid0 conversion ===============
2128 * current implementation assumes that following conditions must be met:
2131 * - near_copies == 2
2133 if ((s
->level
== 0 && array
.level
== 10 && sra
&&
2134 array
.layout
== ((1 << 8) + 2) && !(array
.raid_disks
& 1)) ||
2135 (s
->level
== 0 && array
.level
== 1 && sra
)) {
2137 err
= remove_disks_for_takeover(st
, sra
, array
.layout
);
2139 dprintf("Array cannot be reshaped\n");
2145 /* Make sure mdmon has seen the device removal
2146 * and updated metadata before we continue with
2150 ping_monitor(container
);
2153 memset(&info
, 0, sizeof(info
));
2155 if (sysfs_init(&info
, fd
, NULL
)) {
2156 pr_err("failed to intialize sysfs.\n");
2160 strcpy(info
.text_version
, sra
->text_version
);
2161 info
.component_size
= s
->size
*2;
2162 info
.new_level
= s
->level
;
2163 info
.new_chunk
= s
->chunk
* 1024;
2164 if (info
.array
.level
== LEVEL_CONTAINER
) {
2165 info
.delta_disks
= UnSet
;
2166 info
.array
.raid_disks
= s
->raiddisks
;
2167 } else if (s
->raiddisks
)
2168 info
.delta_disks
= s
->raiddisks
- info
.array
.raid_disks
;
2170 info
.delta_disks
= UnSet
;
2171 if (s
->layout_str
== NULL
) {
2172 info
.new_layout
= UnSet
;
2173 if (info
.array
.level
== 6 &&
2174 (info
.new_level
== 6 || info
.new_level
== UnSet
) &&
2175 info
.array
.layout
>= 16) {
2176 pr_err("%s has a non-standard layout. If you wish to preserve this\n", devname
);
2177 cont_err("during the reshape, please specify --layout=preserve\n");
2178 cont_err("If you want to change it, specify a layout or use --layout=normalise\n");
2182 } else if (strcmp(s
->layout_str
, "normalise") == 0 ||
2183 strcmp(s
->layout_str
, "normalize") == 0) {
2184 /* If we have a -6 RAID6 layout, remove the '-6'. */
2185 info
.new_layout
= UnSet
;
2186 if (info
.array
.level
== 6 && info
.new_level
== UnSet
) {
2188 strcpy(l
, map_num(r6layout
, info
.array
.layout
));
2189 h
= strrchr(l
, '-');
2190 if (h
&& strcmp(h
, "-6") == 0) {
2192 info
.new_layout
= map_name(r6layout
, l
);
2195 pr_err("%s is only meaningful when reshaping a RAID6 array.\n", s
->layout_str
);
2199 } else if (strcmp(s
->layout_str
, "preserve") == 0) {
2200 /* This means that a non-standard RAID6 layout
2203 * - When reshape a RAID6 (e.g. adding a device)
2204 * which is in a non-standard layout, it is OK
2205 * to preserve that layout.
2206 * - When converting a RAID5 to RAID6, leave it in
2207 * the XXX-6 layout, don't re-layout.
2209 if (info
.array
.level
== 6 && info
.new_level
== UnSet
)
2210 info
.new_layout
= info
.array
.layout
;
2211 else if (info
.array
.level
== 5 && info
.new_level
== 6) {
2213 strcpy(l
, map_num(r5layout
, info
.array
.layout
));
2215 info
.new_layout
= map_name(r6layout
, l
);
2217 pr_err("%s in only meaningful when reshaping to RAID6\n", s
->layout_str
);
2222 int l
= info
.new_level
;
2224 l
= info
.array
.level
;
2227 info
.new_layout
= map_name(r5layout
, s
->layout_str
);
2230 info
.new_layout
= map_name(r6layout
, s
->layout_str
);
2233 info
.new_layout
= parse_layout_10(s
->layout_str
);
2236 info
.new_layout
= parse_layout_faulty(s
->layout_str
);
2239 pr_err("layout not meaningful with this level\n");
2243 if (info
.new_layout
== UnSet
) {
2244 pr_err("layout %s not understood for this level\n",
2251 if (array
.level
== LEVEL_FAULTY
) {
2252 if (s
->level
!= UnSet
&& s
->level
!= array
.level
) {
2253 pr_err("cannot change level of Faulty device\n");
2257 pr_err("cannot set chunksize of Faulty device\n");
2260 if (s
->raiddisks
&& s
->raiddisks
!= 1) {
2261 pr_err("cannot set raid_disks of Faulty device\n");
2264 if (s
->layout_str
) {
2265 if (md_get_array_info(fd
, &array
) != 0) {
2266 dprintf("Cannot get array information.\n");
2269 array
.layout
= info
.new_layout
;
2270 if (md_set_array_info(fd
, &array
) != 0) {
2271 pr_err("failed to set new layout\n");
2273 } else if (c
->verbose
>= 0)
2274 printf("layout for %s set to %d\n",
2275 devname
, array
.layout
);
2277 } else if (array
.level
== LEVEL_CONTAINER
) {
2278 /* This change is to be applied to every array in the
2279 * container. This is only needed when the metadata imposes
2280 * restraints of the various arrays in the container.
2281 * Currently we only know that IMSM requires all arrays
2282 * to have the same number of devices so changing the
2283 * number of devices (On-Line Capacity Expansion) must be
2284 * performed at the level of the container
2290 rv
= reshape_container(container
, devname
, -1, st
, &info
,
2291 c
->force
, c
->backup_file
, c
->verbose
, 0, 0, 0);
2294 /* get spare devices from external metadata
2296 if (st
->ss
->external
) {
2297 struct mdinfo
*info2
;
2299 info2
= st
->ss
->container_content(st
, subarray
);
2301 info
.array
.spare_disks
=
2302 info2
->array
.spare_disks
;
2307 /* Impose these changes on a single array. First
2308 * check that the metadata is OK with the change. */
2310 if (reshape_super(st
, 0, info
.new_level
,
2311 info
.new_layout
, info
.new_chunk
,
2312 info
.array
.raid_disks
, info
.delta_disks
,
2313 c
->backup_file
, devname
, APPLY_METADATA_CHANGES
,
2319 rv
= reshape_array(container
, fd
, devname
, st
, &info
, c
->force
,
2320 devlist
, data_offset
, c
->backup_file
, c
->verbose
,
2331 /* verify_reshape_position()
2332 * Function checks if reshape position in metadata is not farther
2333 * than position in md.
2335 * 0 : not valid sysfs entry
2336 * it can be caused by not started reshape, it should be started
2337 * by reshape array or raid0 array is before takeover
2338 * -1 : error, reshape position is obviously wrong
2339 * 1 : success, reshape progress correct or updated
2341 static int verify_reshape_position(struct mdinfo
*info
, int level
)
2347 /* read sync_max, failure can mean raid0 array */
2348 rv
= sysfs_get_str(info
, NULL
, "sync_max", buf
, 40);
2352 unsigned long long position
= strtoull(buf
, &ep
, 0);
2354 dprintf("Read sync_max sysfs entry is: %s\n", buf
);
2355 if (!(ep
== buf
|| (*ep
!= 0 && *ep
!= '\n' && *ep
!= ' '))) {
2356 position
*= get_data_disks(level
,
2358 info
->array
.raid_disks
);
2359 if (info
->reshape_progress
< position
) {
2360 dprintf("Corrected reshape progress (%llu) to md position (%llu)\n",
2361 info
->reshape_progress
, position
);
2362 info
->reshape_progress
= position
;
2364 } else if (info
->reshape_progress
> position
) {
2365 pr_err("Fatal error: array reshape was not properly frozen (expected reshape position is %llu, but reshape progress is %llu.\n",
2366 position
, info
->reshape_progress
);
2369 dprintf("Reshape position in md and metadata are the same;");
2373 } else if (rv
== 0) {
2374 /* for valid sysfs entry, 0-length content
2375 * should be indicated as error
2383 static unsigned long long choose_offset(unsigned long long lo
,
2384 unsigned long long hi
,
2385 unsigned long long min
,
2386 unsigned long long max
)
2388 /* Choose a new offset between hi and lo.
2389 * It must be between min and max, but
2390 * we would prefer something near the middle of hi/lo, and also
2391 * prefer to be aligned to a big power of 2.
2393 * So we start with the middle, then for each bit,
2394 * starting at '1' and increasing, if it is set, we either
2395 * add it or subtract it if possible, preferring the option
2396 * which is furthest from the boundary.
2398 * We stop once we get a 1MB alignment. As units are in sectors,
2399 * 1MB = 2*1024 sectors.
2401 unsigned long long choice
= (lo
+ hi
) / 2;
2402 unsigned long long bit
= 1;
2404 for (bit
= 1; bit
< 2*1024; bit
= bit
<< 1) {
2405 unsigned long long bigger
, smaller
;
2406 if (! (bit
& choice
))
2408 bigger
= choice
+ bit
;
2409 smaller
= choice
- bit
;
2410 if (bigger
> max
&& smaller
< min
)
2414 else if (smaller
< min
)
2416 else if (hi
- bigger
> smaller
- lo
)
2424 static int set_new_data_offset(struct mdinfo
*sra
, struct supertype
*st
,
2425 char *devname
, int delta_disks
,
2426 unsigned long long data_offset
,
2427 unsigned long long min
,
2433 unsigned long long before
, after
;
2435 /* Need to find min space before and after so same is used
2438 before
= UINT64_MAX
;
2440 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
2444 struct supertype
*st2
;
2445 struct mdinfo info2
;
2447 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
2449 dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 0);
2450 dfd
= dev_open(dn
, O_RDONLY
);
2452 pr_err("%s: cannot open component %s\n",
2453 devname
, dn
? dn
: "-unknown-");
2456 st2
= dup_super(st
);
2457 rv
= st2
->ss
->load_super(st2
,dfd
, NULL
);
2461 pr_err("%s: cannot get superblock from %s\n",
2465 st2
->ss
->getinfo_super(st2
, &info2
, NULL
);
2466 st2
->ss
->free_super(st2
);
2468 if (info2
.space_before
== 0 &&
2469 info2
.space_after
== 0) {
2470 /* Metadata doesn't support data_offset changes */
2472 pr_err("%s: Metadata version doesn't support data_offset changes\n",
2476 if (before
> info2
.space_before
)
2477 before
= info2
.space_before
;
2478 if (after
> info2
.space_after
)
2479 after
= info2
.space_after
;
2481 if (data_offset
!= INVALID_SECTORS
) {
2483 if (info2
.data_offset
== data_offset
) {
2484 pr_err("%s: already has that data_offset\n",
2488 if (data_offset
< info2
.data_offset
)
2492 } else if ((data_offset
<= info2
.data_offset
&& dir
== 1) ||
2493 (data_offset
>= info2
.data_offset
&& dir
== -1)) {
2494 pr_err("%s: differing data offsets on devices make this --data-offset setting impossible\n",
2500 if (before
== UINT64_MAX
)
2501 /* impossible really, there must be no devices */
2504 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
2505 char *dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 0);
2506 unsigned long long new_data_offset
;
2508 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
2510 if (delta_disks
< 0) {
2511 /* Don't need any space as array is shrinking
2512 * just move data_offset up by min
2514 if (data_offset
== INVALID_SECTORS
)
2515 new_data_offset
= sd
->data_offset
+ min
;
2517 if (data_offset
< sd
->data_offset
+ min
) {
2518 pr_err("--data-offset too small for %s\n",
2522 new_data_offset
= data_offset
;
2524 } else if (delta_disks
> 0) {
2525 /* need space before */
2529 pr_err("Insufficient head-space for reshape on %s\n",
2533 if (data_offset
== INVALID_SECTORS
)
2534 new_data_offset
= sd
->data_offset
- min
;
2536 if (data_offset
> sd
->data_offset
- min
) {
2537 pr_err("--data-offset too large for %s\n",
2541 new_data_offset
= data_offset
;
2545 /* can move up or down. If 'data_offset'
2546 * was set we would have already decided,
2547 * so just choose direction with most space.
2554 sysfs_set_str(sra
, NULL
, "reshape_direction",
2555 dir
== 1 ? "backwards" : "forwards");
2557 /* Increase data offset */
2561 pr_err("Insufficient tail-space for reshape on %s\n",
2565 if (data_offset
!= INVALID_SECTORS
&&
2566 data_offset
< sd
->data_offset
+ min
) {
2567 pr_err("--data-offset too small on %s\n",
2571 if (data_offset
!= INVALID_SECTORS
)
2572 new_data_offset
= data_offset
;
2574 new_data_offset
= choose_offset(sd
->data_offset
,
2575 sd
->data_offset
+ after
,
2576 sd
->data_offset
+ min
,
2577 sd
->data_offset
+ after
);
2579 /* Decrease data offset */
2583 pr_err("insufficient head-room on %s\n",
2587 if (data_offset
!= INVALID_SECTORS
&&
2588 data_offset
< sd
->data_offset
- min
) {
2589 pr_err("--data-offset too small on %s\n",
2593 if (data_offset
!= INVALID_SECTORS
)
2594 new_data_offset
= data_offset
;
2596 new_data_offset
= choose_offset(sd
->data_offset
- before
,
2598 sd
->data_offset
- before
,
2599 sd
->data_offset
- min
);
2602 err
= sysfs_set_num(sra
, sd
, "new_offset", new_data_offset
);
2603 if (err
< 0 && errno
== E2BIG
) {
2604 /* try again after increasing data size to max */
2605 err
= sysfs_set_num(sra
, sd
, "size", 0);
2606 if (err
< 0 && errno
== EINVAL
&&
2607 !(sd
->disk
.state
& (1<<MD_DISK_SYNC
))) {
2608 /* some kernels have a bug where you cannot
2609 * use '0' on spare devices. */
2610 sysfs_set_num(sra
, sd
, "size",
2611 (sra
->component_size
+ after
)/2);
2613 err
= sysfs_set_num(sra
, sd
, "new_offset",
2617 if (errno
== E2BIG
&& data_offset
!= INVALID_SECTORS
) {
2618 pr_err("data-offset is too big for %s\n",
2622 if (sd
== sra
->devs
&&
2623 (errno
== ENOENT
|| errno
== E2BIG
))
2624 /* Early kernel, no 'new_offset' file,
2625 * or kernel doesn't like us.
2626 * For RAID5/6 this is not fatal
2629 pr_err("Cannot set new_offset for %s\n",
2638 /* Just use a backup file */
2642 static int raid10_reshape(char *container
, int fd
, char *devname
,
2643 struct supertype
*st
, struct mdinfo
*info
,
2644 struct reshape
*reshape
,
2645 unsigned long long data_offset
,
2646 int force
, int verbose
)
2648 /* Changing raid_disks, layout, chunksize or possibly
2649 * just data_offset for a RAID10.
2650 * We must always change data_offset. We change by at least
2651 * ->min_offset_change which is the largest of the old and new
2653 * If raid_disks is increasing, then data_offset must decrease
2654 * by at least this copy size.
2655 * If raid_disks is unchanged, data_offset must increase or
2656 * decrease by at least min_offset_change but preferably by much more.
2657 * We choose half of the available space.
2658 * If raid_disks is decreasing, data_offset must increase by
2659 * at least min_offset_change. To allow of this, component_size
2660 * must be decreased by the same amount.
2662 * So we calculate the required minimum and direction, possibly
2663 * reduce the component_size, then iterate through the devices
2664 * and set the new_data_offset.
2665 * If that all works, we set chunk_size, layout, raid_disks, and start
2669 unsigned long long min
;
2672 sra
= sysfs_read(fd
, NULL
,
2673 GET_COMPONENT
|GET_DEVS
|GET_OFFSET
|GET_STATE
|GET_CHUNK
2676 pr_err("%s: Cannot get array details from sysfs\n",
2680 min
= reshape
->min_offset_change
;
2682 if (info
->delta_disks
)
2683 sysfs_set_str(sra
, NULL
, "reshape_direction",
2684 info
->delta_disks
< 0 ? "backwards" : "forwards");
2685 if (info
->delta_disks
< 0 &&
2686 info
->space_after
< min
) {
2687 int rv
= sysfs_set_num(sra
, NULL
, "component_size",
2688 (sra
->component_size
-
2691 pr_err("cannot reduce component size\n");
2695 err
= set_new_data_offset(sra
, st
, devname
, info
->delta_disks
, data_offset
,
2698 pr_err("Cannot set new_data_offset: RAID10 reshape not\n");
2699 cont_err("supported on this kernel\n");
2705 if (!err
&& sysfs_set_num(sra
, NULL
, "chunk_size", info
->new_chunk
) < 0)
2707 if (!err
&& sysfs_set_num(sra
, NULL
, "layout", reshape
->after
.layout
) < 0)
2709 if (!err
&& sysfs_set_num(sra
, NULL
, "raid_disks",
2710 info
->array
.raid_disks
+ info
->delta_disks
) < 0)
2712 if (!err
&& sysfs_set_str(sra
, NULL
, "sync_action", "reshape") < 0)
2715 pr_err("Cannot set array shape for %s\n",
2718 (info
->array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2719 cont_err(" Bitmap must be removed before shape can be changed\n");
2729 static void get_space_after(int fd
, struct supertype
*st
, struct mdinfo
*info
)
2731 struct mdinfo
*sra
, *sd
;
2732 /* Initialisation to silence compiler warning */
2733 unsigned long long min_space_before
= 0, min_space_after
= 0;
2736 sra
= sysfs_read(fd
, NULL
, GET_DEVS
);
2739 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
2742 struct supertype
*st2
;
2743 struct mdinfo info2
;
2745 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
2747 dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 0);
2748 dfd
= dev_open(dn
, O_RDONLY
);
2751 st2
= dup_super(st
);
2752 if (st2
->ss
->load_super(st2
,dfd
, NULL
)) {
2758 st2
->ss
->getinfo_super(st2
, &info2
, NULL
);
2759 st2
->ss
->free_super(st2
);
2762 min_space_before
> info2
.space_before
)
2763 min_space_before
= info2
.space_before
;
2765 min_space_after
> info2
.space_after
)
2766 min_space_after
= info2
.space_after
;
2769 if (sd
== NULL
&& !first
) {
2770 info
->space_after
= min_space_after
;
2771 info
->space_before
= min_space_before
;
2776 static void update_cache_size(char *container
, struct mdinfo
*sra
,
2777 struct mdinfo
*info
,
2778 int disks
, unsigned long long blocks
)
2780 /* Check that the internal stripe cache is
2781 * large enough, or it won't work.
2782 * It must hold at least 4 stripes of the larger
2785 unsigned long cache
;
2786 cache
= max(info
->array
.chunk_size
, info
->new_chunk
);
2787 cache
*= 4; /* 4 stripes minimum */
2788 cache
/= 512; /* convert to sectors */
2789 /* make sure there is room for 'blocks' with a bit to spare */
2790 if (cache
< 16 + blocks
/ disks
)
2791 cache
= 16 + blocks
/ disks
;
2792 cache
/= (4096/512); /* Convert from sectors to pages */
2794 if (sra
->cache_size
< cache
)
2795 subarray_set_num(container
, sra
, "stripe_cache_size",
2799 static int impose_reshape(struct mdinfo
*sra
,
2800 struct mdinfo
*info
,
2801 struct supertype
*st
,
2804 char *devname
, char *container
,
2805 struct reshape
*reshape
)
2807 struct mdu_array_info_s array
;
2809 sra
->new_chunk
= info
->new_chunk
;
2812 /* for external metadata checkpoint saved by mdmon can be lost
2813 * or missed /due to e.g. crash/. Check if md is not during
2814 * restart farther than metadata points to.
2815 * If so, this means metadata information is obsolete.
2817 if (st
->ss
->external
)
2818 verify_reshape_position(info
, reshape
->level
);
2819 sra
->reshape_progress
= info
->reshape_progress
;
2821 sra
->reshape_progress
= 0;
2822 if (reshape
->after
.data_disks
< reshape
->before
.data_disks
)
2823 /* start from the end of the new array */
2824 sra
->reshape_progress
= (sra
->component_size
2825 * reshape
->after
.data_disks
);
2828 md_get_array_info(fd
, &array
);
2829 if (info
->array
.chunk_size
== info
->new_chunk
&&
2830 reshape
->before
.layout
== reshape
->after
.layout
&&
2831 st
->ss
->external
== 0) {
2832 /* use SET_ARRAY_INFO but only if reshape hasn't started */
2833 array
.raid_disks
= reshape
->after
.data_disks
+ reshape
->parity
;
2834 if (!restart
&& md_set_array_info(fd
, &array
) != 0) {
2837 pr_err("Cannot set device shape for %s: %s\n",
2838 devname
, strerror(errno
));
2841 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2842 cont_err("Bitmap must be removed before shape can be changed\n");
2846 } else if (!restart
) {
2847 /* set them all just in case some old 'new_*' value
2848 * persists from some earlier problem.
2851 if (sysfs_set_num(sra
, NULL
, "chunk_size", info
->new_chunk
) < 0)
2853 if (!err
&& sysfs_set_num(sra
, NULL
, "layout",
2854 reshape
->after
.layout
) < 0)
2856 if (!err
&& subarray_set_num(container
, sra
, "raid_disks",
2857 reshape
->after
.data_disks
+
2858 reshape
->parity
) < 0)
2861 pr_err("Cannot set device shape for %s\n",
2865 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2866 cont_err("Bitmap must be removed before shape can be changed\n");
2875 static int impose_level(int fd
, int level
, char *devname
, int verbose
)
2878 struct mdu_array_info_s array
;
2881 if (sysfs_init(&info
, fd
, NULL
)) {
2882 pr_err("failed to intialize sysfs.\n");
2886 md_get_array_info(fd
, &array
);
2888 (array
.level
>= 4 && array
.level
<= 6)) {
2889 /* To convert to RAID0 we need to fail and
2890 * remove any non-data devices. */
2893 int data_disks
= array
.raid_disks
- 1;
2894 if (array
.level
== 6)
2896 if (array
.level
== 5 &&
2897 array
.layout
!= ALGORITHM_PARITY_N
)
2899 if (array
.level
== 6 &&
2900 array
.layout
!= ALGORITHM_PARITY_N_6
)
2902 sysfs_set_str(&info
, NULL
,"sync_action", "idle");
2903 /* First remove any spares so no recovery starts */
2904 for (d
= 0, found
= 0;
2905 d
< MAX_DISKS
&& found
< array
.nr_disks
;
2907 mdu_disk_info_t disk
;
2909 if (md_get_disk_info(fd
, &disk
) < 0)
2911 if (disk
.major
== 0 && disk
.minor
== 0)
2914 if ((disk
.state
& (1 << MD_DISK_ACTIVE
)) &&
2915 disk
.raid_disk
< data_disks
)
2918 ioctl(fd
, HOT_REMOVE_DISK
,
2919 makedev(disk
.major
, disk
.minor
));
2921 /* Now fail anything left */
2922 md_get_array_info(fd
, &array
);
2923 for (d
= 0, found
= 0;
2924 d
< MAX_DISKS
&& found
< array
.nr_disks
;
2926 mdu_disk_info_t disk
;
2928 if (md_get_disk_info(fd
, &disk
) < 0)
2930 if (disk
.major
== 0 && disk
.minor
== 0)
2933 if ((disk
.state
& (1 << MD_DISK_ACTIVE
)) &&
2934 disk
.raid_disk
< data_disks
)
2937 ioctl(fd
, SET_DISK_FAULTY
,
2938 makedev(disk
.major
, disk
.minor
));
2939 hot_remove_disk(fd
, makedev(disk
.major
, disk
.minor
), 1);
2942 c
= map_num(pers
, level
);
2944 int err
= sysfs_set_str(&info
, NULL
, "level", c
);
2947 pr_err("%s: could not set level to %s\n",
2950 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2951 cont_err("Bitmap must be removed before level can be changed\n");
2955 pr_err("level of %s changed to %s\n",
2962 static void catch_term(int sig
)
2967 static int continue_via_systemd(char *devnm
)
2969 int skipped
, i
, pid
, status
;
2971 /* In a systemd/udev world, it is best to get systemd to
2972 * run "mdadm --grow --continue" rather than running in the
2977 /* FIXME yuk. CLOSE_EXEC?? */
2979 for (i
= 3; skipped
< 20; i
++)
2985 /* Don't want to see error messages from
2986 * systemctl. If the service doesn't exist,
2987 * we fork ourselves.
2990 open("/dev/null", O_WRONLY
);
2991 snprintf(pathbuf
, sizeof(pathbuf
), "mdadm-grow-continue@%s.service",
2993 status
= execl("/usr/bin/systemctl", "systemctl",
2996 status
= execl("/bin/systemctl", "systemctl", "start",
2999 case -1: /* Just do it ourselves. */
3001 default: /* parent - good */
3002 pid
= wait(&status
);
3003 if (pid
>= 0 && status
== 0)
3009 static int reshape_array(char *container
, int fd
, char *devname
,
3010 struct supertype
*st
, struct mdinfo
*info
,
3011 int force
, struct mddev_dev
*devlist
,
3012 unsigned long long data_offset
,
3013 char *backup_file
, int verbose
, int forked
,
3014 int restart
, int freeze_reshape
)
3016 struct reshape reshape
;
3019 int orig_level
= UnSet
;
3023 struct mdu_array_info_s array
;
3026 struct mddev_dev
*dv
;
3030 unsigned long long *offsets
= NULL
;
3034 unsigned long blocks
;
3035 unsigned long long array_size
;
3037 struct mdinfo
*sra
= NULL
;
3040 /* when reshaping a RAID0, the component_size might be zero.
3041 * So try to fix that up.
3043 if (md_get_array_info(fd
, &array
) != 0) {
3044 dprintf("Cannot get array information.\n");
3047 if (array
.level
== 0 && info
->component_size
== 0) {
3048 get_dev_size(fd
, NULL
, &array_size
);
3049 info
->component_size
= array_size
/ array
.raid_disks
;
3052 if (array
.level
== 10)
3053 /* Need space_after info */
3054 get_space_after(fd
, st
, info
);
3056 if (info
->reshape_active
) {
3057 int new_level
= info
->new_level
;
3058 info
->new_level
= UnSet
;
3059 if (info
->delta_disks
> 0)
3060 info
->array
.raid_disks
-= info
->delta_disks
;
3061 msg
= analyse_change(devname
, info
, &reshape
);
3062 info
->new_level
= new_level
;
3063 if (info
->delta_disks
> 0)
3064 info
->array
.raid_disks
+= info
->delta_disks
;
3066 /* Make sure the array isn't read-only */
3067 ioctl(fd
, RESTART_ARRAY_RW
, 0);
3069 msg
= analyse_change(devname
, info
, &reshape
);
3071 /* if msg == "", error has already been printed */
3073 pr_err("%s\n", msg
);
3077 (reshape
.level
!= info
->array
.level
||
3078 reshape
.before
.layout
!= info
->array
.layout
||
3079 reshape
.before
.data_disks
+ reshape
.parity
!=
3080 info
->array
.raid_disks
- max(0, info
->delta_disks
))) {
3081 pr_err("reshape info is not in native format - cannot continue.\n");
3085 if (st
->ss
->external
&& restart
&& (info
->reshape_progress
== 0) &&
3086 !((sysfs_get_str(info
, NULL
, "sync_action", buf
, sizeof(buf
)) > 0) &&
3087 (strncmp(buf
, "reshape", 7) == 0))) {
3088 /* When reshape is restarted from '0', very begin of array
3089 * it is possible that for external metadata reshape and array
3090 * configuration doesn't happen.
3091 * Check if md has the same opinion, and reshape is restarted
3092 * from 0. If so, this is regular reshape start after reshape
3093 * switch in metadata to next array only.
3095 if ((verify_reshape_position(info
, reshape
.level
) >= 0) &&
3096 (info
->reshape_progress
== 0))
3100 /* reshape already started. just skip to monitoring the reshape */
3101 if (reshape
.backup_blocks
== 0)
3103 if (restart
& RESHAPE_NO_BACKUP
)
3106 /* Need 'sra' down at 'started:' */
3107 sra
= sysfs_read(fd
, NULL
,
3108 GET_COMPONENT
|GET_DEVS
|GET_OFFSET
|GET_STATE
|GET_CHUNK
|
3111 pr_err("%s: Cannot get array details from sysfs\n",
3117 backup_file
= locate_backup(sra
->sys_name
);
3121 /* The container is frozen but the array may not be.
3122 * So freeze the array so spares don't get put to the wrong use
3123 * FIXME there should probably be a cleaner separation between
3124 * freeze_array and freeze_container.
3126 sysfs_freeze_array(info
);
3127 /* Check we have enough spares to not be degraded */
3129 for (dv
= devlist
; dv
; dv
=dv
->next
)
3131 spares_needed
= max(reshape
.before
.data_disks
,
3132 reshape
.after
.data_disks
)
3133 + reshape
.parity
- array
.raid_disks
;
3136 info
->new_level
> 1 && info
->array
.level
> 1 &&
3137 spares_needed
> info
->array
.spare_disks
+ added_disks
) {
3138 pr_err("Need %d spare%s to avoid degraded array, and only have %d.\n"
3139 " Use --force to over-ride this check.\n",
3141 spares_needed
== 1 ? "" : "s",
3142 info
->array
.spare_disks
+ added_disks
);
3145 /* Check we have enough spares to not fail */
3146 spares_needed
= max(reshape
.before
.data_disks
,
3147 reshape
.after
.data_disks
)
3149 if ((info
->new_level
> 1 || info
->new_level
== 0) &&
3150 spares_needed
> info
->array
.spare_disks
+added_disks
) {
3151 pr_err("Need %d spare%s to create working array, and only have %d.\n",
3153 spares_needed
== 1 ? "" : "s",
3154 info
->array
.spare_disks
+ added_disks
);
3158 if (reshape
.level
!= array
.level
) {
3159 int err
= impose_level(fd
, reshape
.level
, devname
, verbose
);
3162 info
->new_layout
= UnSet
; /* after level change,
3163 * layout is meaningless */
3164 orig_level
= array
.level
;
3165 sysfs_freeze_array(info
);
3167 if (reshape
.level
> 0 && st
->ss
->external
) {
3168 /* make sure mdmon is aware of the new level */
3169 if (mdmon_running(container
))
3170 flush_mdmon(container
);
3172 if (!mdmon_running(container
))
3173 start_mdmon(container
);
3174 ping_monitor(container
);
3175 if (mdmon_running(container
) &&
3176 st
->update_tail
== NULL
)
3177 st
->update_tail
= &st
->updates
;
3180 /* ->reshape_super might have chosen some spares from the
3181 * container that it wants to be part of the new array.
3182 * We can collect them with ->container_content and give
3183 * them to the kernel.
3185 if (st
->ss
->reshape_super
&& st
->ss
->container_content
) {
3186 char *subarray
= strchr(info
->text_version
+1, '/')+1;
3187 struct mdinfo
*info2
=
3188 st
->ss
->container_content(st
, subarray
);
3192 if (sysfs_init(info2
, fd
, st
->devnm
)) {
3193 pr_err("unable to initialize sysfs for %s",
3198 /* When increasing number of devices, we need to set
3199 * new raid_disks before adding these, or they might
3202 if (reshape
.backup_blocks
&&
3203 reshape
.after
.data_disks
> reshape
.before
.data_disks
)
3204 subarray_set_num(container
, info2
, "raid_disks",
3205 reshape
.after
.data_disks
+
3207 for (d
= info2
->devs
; d
; d
= d
->next
) {
3208 if (d
->disk
.state
== 0 &&
3209 d
->disk
.raid_disk
>= 0) {
3210 /* This is a spare that wants to
3211 * be part of the array.
3213 add_disk(fd
, st
, info2
, d
);
3219 /* We might have been given some devices to add to the
3220 * array. Now that the array has been changed to the right
3221 * level and frozen, we can safely add them.
3224 if (Manage_subdevs(devname
, fd
, devlist
, verbose
,
3229 if (reshape
.backup_blocks
== 0 && data_offset
!= INVALID_SECTORS
)
3230 reshape
.backup_blocks
= reshape
.before
.data_disks
* info
->array
.chunk_size
/512;
3231 if (reshape
.backup_blocks
== 0) {
3232 /* No restriping needed, but we might need to impose
3233 * some more changes: layout, raid_disks, chunk_size
3235 /* read current array info */
3236 if (md_get_array_info(fd
, &array
) != 0) {
3237 dprintf("Cannot get array information.\n");
3240 /* compare current array info with new values and if
3241 * it is different update them to new */
3242 if (info
->new_layout
!= UnSet
&&
3243 info
->new_layout
!= array
.layout
) {
3244 array
.layout
= info
->new_layout
;
3245 if (md_set_array_info(fd
, &array
) != 0) {
3246 pr_err("failed to set new layout\n");
3248 } else if (verbose
>= 0)
3249 printf("layout for %s set to %d\n",
3250 devname
, array
.layout
);
3252 if (info
->delta_disks
!= UnSet
&&
3253 info
->delta_disks
!= 0 &&
3254 array
.raid_disks
!= (info
->array
.raid_disks
+ info
->delta_disks
)) {
3255 array
.raid_disks
+= info
->delta_disks
;
3256 if (md_set_array_info(fd
, &array
) != 0) {
3257 pr_err("failed to set raid disks\n");
3259 } else if (verbose
>= 0) {
3260 printf("raid_disks for %s set to %d\n",
3261 devname
, array
.raid_disks
);
3264 if (info
->new_chunk
!= 0 &&
3265 info
->new_chunk
!= array
.chunk_size
) {
3266 if (sysfs_set_num(info
, NULL
,
3267 "chunk_size", info
->new_chunk
) != 0) {
3268 pr_err("failed to set chunk size\n");
3270 } else if (verbose
>= 0)
3271 printf("chunk size for %s set to %d\n",
3272 devname
, array
.chunk_size
);
3279 * There are three possibilities.
3280 * 1/ The array will shrink.
3281 * We need to ensure the reshape will pause before reaching
3282 * the 'critical section'. We also need to fork and wait for
3283 * that to happen. When it does we
3284 * suspend/backup/complete/unfreeze
3286 * 2/ The array will not change size.
3287 * This requires that we keep a backup of a sliding window
3288 * so that we can restore data after a crash. So we need
3289 * to fork and monitor progress.
3290 * In future we will allow the data_offset to change, so
3291 * a sliding backup becomes unnecessary.
3293 * 3/ The array will grow. This is relatively easy.
3294 * However the kernel's restripe routines will cheerfully
3295 * overwrite some early data before it is safe. So we
3296 * need to make a backup of the early parts of the array
3297 * and be ready to restore it if rebuild aborts very early.
3298 * For externally managed metadata, we still need a forked
3299 * child to monitor the reshape and suspend IO over the region
3300 * that is being reshaped.
3302 * We backup data by writing it to one spare, or to a
3303 * file which was given on command line.
3305 * In each case, we first make sure that storage is available
3306 * for the required backup.
3308 * - request the shape change.
3309 * - fork to handle backup etc.
3311 /* Check that we can hold all the data */
3312 get_dev_size(fd
, NULL
, &array_size
);
3313 if (reshape
.new_size
< (array_size
/512)) {
3314 pr_err("this change will reduce the size of the array.\n"
3315 " use --grow --array-size first to truncate array.\n"
3316 " e.g. mdadm --grow %s --array-size %llu\n",
3317 devname
, reshape
.new_size
/2);
3321 if (array
.level
== 10) {
3322 /* Reshaping RAID10 does not require any data backup by
3323 * user-space. Instead it requires that the data_offset
3324 * is changed to avoid the need for backup.
3325 * So this is handled very separately
3328 /* Nothing to do. */
3330 return raid10_reshape(container
, fd
, devname
, st
, info
,
3331 &reshape
, data_offset
,
3334 sra
= sysfs_read(fd
, NULL
,
3335 GET_COMPONENT
|GET_DEVS
|GET_OFFSET
|GET_STATE
|GET_CHUNK
|
3338 pr_err("%s: Cannot get array details from sysfs\n",
3344 switch(set_new_data_offset(sra
, st
, devname
,
3345 reshape
.after
.data_disks
- reshape
.before
.data_disks
,
3347 reshape
.min_offset_change
, 1)) {
3351 /* Updated data_offset, so it's easy now */
3352 update_cache_size(container
, sra
, info
,
3353 min(reshape
.before
.data_disks
,
3354 reshape
.after
.data_disks
),
3355 reshape
.backup_blocks
);
3357 /* Right, everything seems fine. Let's kick things off.
3361 if (impose_reshape(sra
, info
, st
, fd
, restart
,
3362 devname
, container
, &reshape
) < 0)
3364 if (sysfs_set_str(sra
, NULL
, "sync_action", "reshape") < 0) {
3366 if (errno
!= EINVAL
) {
3367 pr_err("Failed to initiate reshape!\n");
3370 /* revert data_offset and try the old way */
3371 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
3372 sysfs_set_num(sra
, sd
, "new_offset",
3374 sysfs_set_str(sra
, NULL
, "reshape_direction",
3379 if (info
->new_level
== reshape
.level
)
3381 /* need to adjust level when reshape completes */
3383 case -1: /* ignore error, but don't wait */
3385 default: /* parent */
3393 fd
= open_dev(sra
->sys_name
);
3395 impose_level(fd
, info
->new_level
, devname
, verbose
);
3397 case 1: /* Couldn't set data_offset, try the old way */
3398 if (data_offset
!= INVALID_SECTORS
) {
3399 pr_err("Cannot update data_offset on this array\n");
3406 /* Decide how many blocks (sectors) for a reshape
3407 * unit. The number we have so far is just a minimum
3409 blocks
= reshape
.backup_blocks
;
3410 if (reshape
.before
.data_disks
==
3411 reshape
.after
.data_disks
) {
3412 /* Make 'blocks' bigger for better throughput, but
3413 * not so big that we reject it below.
3414 * Try for 16 megabytes
3416 while (blocks
* 32 < sra
->component_size
&&
3420 pr_err("Need to backup %luK of critical section..\n", blocks
/2);
3422 if (blocks
>= sra
->component_size
/2) {
3423 pr_err("%s: Something wrong - reshape aborted\n",
3428 /* Now we need to open all these devices so we can read/write.
3430 nrdisks
= max(reshape
.before
.data_disks
,
3431 reshape
.after
.data_disks
) + reshape
.parity
3432 + sra
->array
.spare_disks
;
3433 fdlist
= xcalloc((1+nrdisks
), sizeof(int));
3434 offsets
= xcalloc((1+nrdisks
), sizeof(offsets
[0]));
3436 odisks
= reshape
.before
.data_disks
+ reshape
.parity
;
3437 d
= reshape_prepare_fdlist(devname
, sra
, odisks
,
3438 nrdisks
, blocks
, backup_file
,
3443 if ((st
->ss
->manage_reshape
== NULL
) ||
3444 (st
->ss
->recover_backup
== NULL
)) {
3445 if (backup_file
== NULL
) {
3446 if (reshape
.after
.data_disks
<=
3447 reshape
.before
.data_disks
) {
3448 pr_err("%s: Cannot grow - need backup-file\n",
3450 pr_err(" Please provide one with \"--backup=...\"\n");
3452 } else if (d
== odisks
) {
3453 pr_err("%s: Cannot grow - need a spare or backup-file to backup critical section\n", devname
);
3457 if (!reshape_open_backup_file(backup_file
, fd
, devname
,
3459 fdlist
+d
, offsets
+d
,
3468 update_cache_size(container
, sra
, info
,
3469 min(reshape
.before
.data_disks
, reshape
.after
.data_disks
),
3472 /* Right, everything seems fine. Let's kick things off.
3473 * If only changing raid_disks, use ioctl, else use
3478 if (impose_reshape(sra
, info
, st
, fd
, restart
,
3479 devname
, container
, &reshape
) < 0)
3482 err
= start_reshape(sra
, restart
, reshape
.before
.data_disks
,
3483 reshape
.after
.data_disks
);
3485 pr_err("Cannot %s reshape for %s\n",
3486 restart
? "continue" : "start",
3491 sysfs_set_str(sra
, NULL
, "array_state", "active");
3492 if (freeze_reshape
) {
3496 pr_err("Reshape has to be continued from location %llu when root filesystem has been mounted.\n",
3497 sra
->reshape_progress
);
3501 if (!forked
&& !check_env("MDADM_NO_SYSTEMCTL"))
3502 if (continue_via_systemd(container
?: sra
->sys_name
)) {
3509 /* Now we just need to kick off the reshape and watch, while
3510 * handling backups of the data...
3511 * This is all done by a forked background process.
3513 switch(forked
? 0 : fork()) {
3515 pr_err("Cannot run child to monitor reshape: %s\n",
3529 /* If another array on the same devices is busy, the
3530 * reshape will wait for them. This would mean that
3531 * the first section that we suspend will stay suspended
3532 * for a long time. So check on that possibility
3533 * by looking for "DELAYED" in /proc/mdstat, and if found,
3537 struct mdstat_ent
*mds
, *m
;
3539 mds
= mdstat_read(1, 0);
3540 for (m
= mds
; m
; m
= m
->next
)
3541 if (strcmp(m
->devnm
, sra
->sys_name
) == 0) {
3543 m
->percent
== RESYNC_DELAYED
)
3546 /* Haven't started the reshape thread
3553 if (delayed
== 1 && get_linux_version() < 3007000) {
3554 pr_err("Reshape is delayed, but cannot wait carefully with this kernel.\n"
3555 " You might experience problems until other reshapes complete.\n");
3559 mdstat_wait(30 - (delayed
-1) * 25);
3563 if (check_env("MDADM_GROW_VERIFY"))
3564 fd
= open(devname
, O_RDONLY
| O_DIRECT
);
3567 mlockall(MCL_FUTURE
);
3569 signal(SIGTERM
, catch_term
);
3571 if (st
->ss
->external
) {
3572 /* metadata handler takes it from here */
3573 done
= st
->ss
->manage_reshape(
3574 fd
, sra
, &reshape
, st
, blocks
,
3576 d
- odisks
, fdlist
+odisks
,
3579 done
= child_monitor(
3580 fd
, sra
, &reshape
, st
, blocks
,
3582 d
- odisks
, fdlist
+odisks
,
3588 if (backup_file
&& done
) {
3590 bul
= make_backup(sra
->sys_name
);
3593 int l
= readlink(bul
, buf
, sizeof(buf
) - 1);
3601 unlink(backup_file
);
3608 if (!st
->ss
->external
&&
3609 !(reshape
.before
.data_disks
!= reshape
.after
.data_disks
&&
3610 info
->custom_array_size
) && info
->new_level
== reshape
.level
&&
3612 /* no need to wait for the reshape to finish as
3613 * there is nothing more to do.
3620 if (st
->ss
->external
) {
3621 /* Re-load the metadata as much could have changed */
3622 int cfd
= open_dev(st
->container_devnm
);
3624 flush_mdmon(container
);
3625 st
->ss
->free_super(st
);
3626 st
->ss
->load_container(st
, cfd
, container
);
3631 /* set new array size if required customer_array_size is used
3634 if (reshape
.before
.data_disks
!=
3635 reshape
.after
.data_disks
&&
3636 info
->custom_array_size
)
3637 set_array_size(st
, info
, info
->text_version
);
3639 if (info
->new_level
!= reshape
.level
) {
3641 fd
= open(devname
, O_RDONLY
);
3642 impose_level(fd
, info
->new_level
, devname
, verbose
);
3644 if (info
->new_level
== 0)
3645 st
->update_tail
= NULL
;
3657 if (orig_level
!= UnSet
&& sra
) {
3658 c
= map_num(pers
, orig_level
);
3659 if (c
&& sysfs_set_str(sra
, NULL
, "level", c
) == 0)
3660 pr_err("aborting level change\n");
3668 /* mdfd handle is passed to be closed in child process (after fork).
3670 int reshape_container(char *container
, char *devname
,
3672 struct supertype
*st
,
3673 struct mdinfo
*info
,
3675 char *backup_file
, int verbose
,
3676 int forked
, int restart
, int freeze_reshape
)
3678 struct mdinfo
*cc
= NULL
;
3680 char last_devnm
[32] = "";
3682 /* component_size is not meaningful for a container,
3683 * so pass '0' meaning 'no change'
3686 reshape_super(st
, 0, info
->new_level
,
3687 info
->new_layout
, info
->new_chunk
,
3688 info
->array
.raid_disks
, info
->delta_disks
,
3689 backup_file
, devname
, APPLY_METADATA_CHANGES
,
3697 /* ping monitor to be sure that update is on disk
3699 ping_monitor(container
);
3701 if (!forked
&& !freeze_reshape
&& !check_env("MDADM_NO_SYSTEMCTL"))
3702 if (continue_via_systemd(container
))
3705 switch (forked
? 0 : fork()) {
3706 case -1: /* error */
3707 perror("Cannot fork to complete reshape\n");
3710 default: /* parent */
3711 if (!freeze_reshape
)
3712 printf("%s: multi-array reshape continues in background\n", Name
);
3719 /* close unused handle in child process
3725 /* For each member array with reshape_active,
3726 * we need to perform the reshape.
3727 * We pick the first array that needs reshaping and
3728 * reshape it. reshape_array() will re-read the metadata
3729 * so the next time through a different array should be
3730 * ready for reshape.
3731 * It is possible that the 'different' array will not
3732 * be assembled yet. In that case we simple exit.
3733 * When it is assembled, the mdadm which assembles it
3734 * will take over the reshape.
3736 struct mdinfo
*content
;
3738 struct mdstat_ent
*mdstat
;
3744 cc
= st
->ss
->container_content(st
, NULL
);
3746 for (content
= cc
; content
; content
= content
->next
) {
3748 if (!content
->reshape_active
)
3751 subarray
= strchr(content
->text_version
+1, '/')+1;
3752 mdstat
= mdstat_by_subdev(subarray
, container
);
3755 if (mdstat
->active
== 0) {
3756 pr_err("Skipping inactive array %s.\n",
3758 free_mdstat(mdstat
);
3767 devid
= devnm2devid(mdstat
->devnm
);
3768 adev
= map_dev(major(devid
), minor(devid
), 0);
3770 adev
= content
->text_version
;
3772 fd
= open_dev(mdstat
->devnm
);
3774 pr_err("Device %s cannot be opened for reshape.\n", adev
);
3778 if (strcmp(last_devnm
, mdstat
->devnm
) == 0) {
3779 /* Do not allow for multiple reshape_array() calls for
3781 * It can happen when reshape_array() returns without
3782 * error, when reshape is not finished (wrong reshape
3783 * starting/continuation conditions). Mdmon doesn't
3784 * switch to next array in container and reentry
3785 * conditions for the same array occur.
3786 * This is possibly interim until the behaviour of
3787 * reshape_array is resolved().
3789 printf("%s: Multiple reshape execution detected for device %s.\n", Name
, adev
);
3793 strcpy(last_devnm
, mdstat
->devnm
);
3795 if (sysfs_init(content
, fd
, mdstat
->devnm
)) {
3796 pr_err("Unable to initialize sysfs for %s\n",
3802 if (mdmon_running(container
))
3803 flush_mdmon(container
);
3805 rv
= reshape_array(container
, fd
, adev
, st
,
3806 content
, force
, NULL
, INVALID_SECTORS
,
3807 backup_file
, verbose
, 1, restart
,
3811 if (freeze_reshape
) {
3820 if (mdmon_running(container
))
3821 flush_mdmon(container
);
3830 * We run a child process in the background which performs the following
3832 * - wait for resync to reach a certain point
3833 * - suspend io to the following section
3834 * - backup that section
3835 * - allow resync to proceed further
3837 * - discard the backup.
3839 * When are combined in slightly different ways in the three cases.
3841 * - suspend/backup/allow/wait/resume/discard
3843 * - allow/wait/suspend/backup/allow/wait/resume/discard
3845 * - wait/resume/discard/suspend/backup/allow
3847 * suspend/backup/allow always come together
3848 * wait/resume/discard do too.
3849 * For the same-size case we have two backups to improve flow.
3853 int progress_reshape(struct mdinfo
*info
, struct reshape
*reshape
,
3854 unsigned long long backup_point
,
3855 unsigned long long wait_point
,
3856 unsigned long long *suspend_point
,
3857 unsigned long long *reshape_completed
, int *frozen
)
3859 /* This function is called repeatedly by the reshape manager.
3860 * It determines how much progress can safely be made and allows
3862 * - 'info' identifies the array and particularly records in
3863 * ->reshape_progress the metadata's knowledge of progress
3864 * This is a sector offset from the start of the array
3865 * of the next array block to be relocated. This number
3866 * may increase from 0 or decrease from array_size, depending
3867 * on the type of reshape that is happening.
3868 * Note that in contrast, 'sync_completed' is a block count of the
3869 * reshape so far. It gives the distance between the start point
3870 * (head or tail of device) and the next place that data will be
3871 * written. It always increases.
3872 * - 'reshape' is the structure created by analyse_change
3873 * - 'backup_point' shows how much the metadata manager has backed-up
3874 * data. For reshapes with increasing progress, it is the next address
3875 * to be backed up, previous addresses have been backed-up. For
3876 * decreasing progress, it is the earliest address that has been
3877 * backed up - later address are also backed up.
3878 * So addresses between reshape_progress and backup_point are
3879 * backed up providing those are in the 'correct' order.
3880 * - 'wait_point' is an array address. When reshape_completed
3881 * passes this point, progress_reshape should return. It might
3882 * return earlier if it determines that ->reshape_progress needs
3883 * to be updated or further backup is needed.
3884 * - suspend_point is maintained by progress_reshape and the caller
3885 * should not touch it except to initialise to zero.
3886 * It is an array address and it only increases in 2.6.37 and earlier.
3887 * This makes it difficult to handle reducing reshapes with
3888 * external metadata.
3889 * However: it is similar to backup_point in that it records the
3890 * other end of a suspended region from reshape_progress.
3891 * it is moved to extend the region that is safe to backup and/or
3893 * - reshape_completed is read from sysfs and returned. The caller
3894 * should copy this into ->reshape_progress when it has reason to
3895 * believe that the metadata knows this, and any backup outside this
3899 * 1 if more data from backup_point - but only as far as suspend_point,
3900 * should be backed up
3901 * 0 if things are progressing smoothly
3902 * -1 if the reshape is finished because it is all done,
3903 * -2 if the reshape is finished due to an error.
3906 int advancing
= (reshape
->after
.data_disks
3907 >= reshape
->before
.data_disks
);
3908 unsigned long long need_backup
; /* All data between start of array and
3909 * here will at some point need to
3912 unsigned long long read_offset
, write_offset
;
3913 unsigned long long write_range
;
3914 unsigned long long max_progress
, target
, completed
;
3915 unsigned long long array_size
= (info
->component_size
3916 * reshape
->before
.data_disks
);
3920 /* First, we unsuspend any region that is now known to be safe.
3921 * If suspend_point is on the 'wrong' side of reshape_progress, then
3922 * we don't have or need suspension at the moment. This is true for
3923 * native metadata when we don't need to back-up.
3926 if (info
->reshape_progress
<= *suspend_point
)
3927 sysfs_set_num(info
, NULL
, "suspend_lo",
3928 info
->reshape_progress
);
3930 /* Note: this won't work in 2.6.37 and before.
3931 * Something somewhere should make sure we don't need it!
3933 if (info
->reshape_progress
>= *suspend_point
)
3934 sysfs_set_num(info
, NULL
, "suspend_hi",
3935 info
->reshape_progress
);
3938 /* Now work out how far it is safe to progress.
3939 * If the read_offset for ->reshape_progress is less than
3940 * 'blocks' beyond the write_offset, we can only progress as far
3942 * Otherwise we can progress until the write_offset for the new location
3943 * reaches (within 'blocks' of) the read_offset at the current location.
3944 * However that region must be suspended unless we are using native
3946 * If we need to suspend more, we limit it to 128M per device, which is
3947 * rather arbitrary and should be some time-based calculation.
3949 read_offset
= info
->reshape_progress
/ reshape
->before
.data_disks
;
3950 write_offset
= info
->reshape_progress
/ reshape
->after
.data_disks
;
3951 write_range
= info
->new_chunk
/512;
3952 if (reshape
->before
.data_disks
== reshape
->after
.data_disks
)
3953 need_backup
= array_size
;
3955 need_backup
= reshape
->backup_blocks
;
3957 if (read_offset
< write_offset
+ write_range
)
3958 max_progress
= backup_point
;
3962 reshape
->after
.data_disks
;
3964 if (read_offset
> write_offset
- write_range
)
3965 /* Can only progress as far as has been backed up,
3966 * which must be suspended */
3967 max_progress
= backup_point
;
3968 else if (info
->reshape_progress
<= need_backup
)
3969 max_progress
= backup_point
;
3971 if (info
->array
.major_version
>= 0)
3972 /* Can progress until backup is needed */
3973 max_progress
= need_backup
;
3975 /* Can progress until metadata update is required */
3978 reshape
->after
.data_disks
;
3979 /* but data must be suspended */
3980 if (max_progress
< *suspend_point
)
3981 max_progress
= *suspend_point
;
3986 /* We know it is safe to progress to 'max_progress' providing
3987 * it is suspended or we are using native metadata.
3988 * Consider extending suspend_point 128M per device if it
3989 * is less than 64M per device beyond reshape_progress.
3990 * But always do a multiple of 'blocks'
3991 * FIXME this is too big - it takes to long to complete
3994 target
= 64*1024*2 * min(reshape
->before
.data_disks
,
3995 reshape
->after
.data_disks
);
3996 target
/= reshape
->backup_blocks
;
3999 target
*= reshape
->backup_blocks
;
4001 /* For externally managed metadata we always need to suspend IO to
4002 * the area being reshaped so we regularly push suspend_point forward.
4003 * For native metadata we only need the suspend if we are going to do
4007 if ((need_backup
> info
->reshape_progress
||
4008 info
->array
.major_version
< 0) &&
4009 *suspend_point
< info
->reshape_progress
+ target
) {
4010 if (need_backup
< *suspend_point
+ 2 * target
)
4011 *suspend_point
= need_backup
;
4012 else if (*suspend_point
+ 2 * target
< array_size
)
4013 *suspend_point
+= 2 * target
;
4015 *suspend_point
= array_size
;
4016 sysfs_set_num(info
, NULL
, "suspend_hi", *suspend_point
);
4017 if (max_progress
> *suspend_point
)
4018 max_progress
= *suspend_point
;
4021 if (info
->array
.major_version
>= 0) {
4022 /* Only need to suspend when about to backup */
4023 if (info
->reshape_progress
< need_backup
* 2 &&
4024 *suspend_point
> 0) {
4026 sysfs_set_num(info
, NULL
, "suspend_lo", 0);
4027 sysfs_set_num(info
, NULL
, "suspend_hi", need_backup
);
4030 /* Need to suspend continually */
4031 if (info
->reshape_progress
< *suspend_point
)
4032 *suspend_point
= info
->reshape_progress
;
4033 if (*suspend_point
+ target
< info
->reshape_progress
)
4034 /* No need to move suspend region yet */;
4036 if (*suspend_point
>= 2 * target
)
4037 *suspend_point
-= 2 * target
;
4040 sysfs_set_num(info
, NULL
, "suspend_lo",
4043 if (max_progress
< *suspend_point
)
4044 max_progress
= *suspend_point
;
4048 /* now set sync_max to allow that progress. sync_max, like
4049 * sync_completed is a count of sectors written per device, so
4050 * we find the difference between max_progress and the start point,
4051 * and divide that by after.data_disks to get a sync_max
4053 * At the same time we convert wait_point to a similar number
4054 * for comparing against sync_completed.
4056 /* scale down max_progress to per_disk */
4057 max_progress
/= reshape
->after
.data_disks
;
4058 /* Round to chunk size as some kernels give an erroneously high number */
4059 max_progress
/= info
->new_chunk
/512;
4060 max_progress
*= info
->new_chunk
/512;
4061 /* And round to old chunk size as the kernel wants that */
4062 max_progress
/= info
->array
.chunk_size
/512;
4063 max_progress
*= info
->array
.chunk_size
/512;
4064 /* Limit progress to the whole device */
4065 if (max_progress
> info
->component_size
)
4066 max_progress
= info
->component_size
;
4067 wait_point
/= reshape
->after
.data_disks
;
4069 /* switch from 'device offset' to 'processed block count' */
4070 max_progress
= info
->component_size
- max_progress
;
4071 wait_point
= info
->component_size
- wait_point
;
4075 sysfs_set_num(info
, NULL
, "sync_max", max_progress
);
4077 /* Now wait. If we have already reached the point that we were
4078 * asked to wait to, don't wait at all, else wait for any change.
4079 * We need to select on 'sync_completed' as that is the place that
4080 * notifications happen, but we are really interested in
4081 * 'reshape_position'
4083 fd
= sysfs_get_fd(info
, NULL
, "sync_completed");
4085 goto check_progress
;
4087 if (sysfs_fd_get_ll(fd
, &completed
) < 0)
4088 goto check_progress
;
4090 while (completed
< max_progress
&& completed
< wait_point
) {
4091 /* Check that sync_action is still 'reshape' to avoid
4092 * waiting forever on a dead array
4095 if (sysfs_get_str(info
, NULL
, "sync_action",
4097 strncmp(action
, "reshape", 7) != 0)
4099 /* Some kernels reset 'sync_completed' to zero
4100 * before setting 'sync_action' to 'idle'.
4101 * So we need these extra tests.
4103 if (completed
== 0 && advancing
&&
4104 strncmp(action
, "idle", 4) == 0 &&
4105 info
->reshape_progress
> 0)
4107 if (completed
== 0 && !advancing
&&
4108 strncmp(action
, "idle", 4) == 0 &&
4109 info
->reshape_progress
< (info
->component_size
4110 * reshape
->after
.data_disks
))
4112 sysfs_wait(fd
, NULL
);
4113 if (sysfs_fd_get_ll(fd
, &completed
) < 0)
4114 goto check_progress
;
4116 /* Some kernels reset 'sync_completed' to zero,
4117 * we need to have real point we are in md.
4118 * So in that case, read 'reshape_position' from sysfs.
4120 if (completed
== 0) {
4121 unsigned long long reshapep
;
4123 if (sysfs_get_str(info
, NULL
, "sync_action",
4125 strncmp(action
, "idle", 4) == 0 &&
4126 sysfs_get_ll(info
, NULL
,
4127 "reshape_position", &reshapep
) == 0)
4128 *reshape_completed
= reshapep
;
4130 /* some kernels can give an incorrectly high
4131 * 'completed' number, so round down */
4132 completed
/= (info
->new_chunk
/512);
4133 completed
*= (info
->new_chunk
/512);
4134 /* Convert 'completed' back in to a 'progress' number */
4135 completed
*= reshape
->after
.data_disks
;
4137 completed
= (info
->component_size
4138 * reshape
->after
.data_disks
4140 *reshape_completed
= completed
;
4145 /* We return the need_backup flag. Caller will decide
4146 * how much - a multiple of ->backup_blocks up to *suspend_point
4149 return need_backup
> info
->reshape_progress
;
4151 return need_backup
>= info
->reshape_progress
;
4154 /* if we couldn't read a number from sync_completed, then
4155 * either the reshape did complete, or it aborted.
4156 * We can tell which by checking for 'none' in reshape_position.
4157 * If it did abort, then it might immediately restart if it
4158 * it was just a device failure that leaves us degraded but
4161 if (sysfs_get_str(info
, NULL
, "reshape_position", buf
,
4163 strncmp(buf
, "none", 4) != 0) {
4164 /* The abort might only be temporary. Wait up to 10
4165 * seconds for fd to contain a valid number again.
4169 unsigned long long new_sync_max
;
4170 while (fd
>= 0 && rv
< 0 && wait
> 0) {
4171 if (sysfs_wait(fd
, &wait
) != 1)
4173 switch (sysfs_fd_get_ll(fd
, &completed
)) {
4175 /* all good again */
4177 /* If "sync_max" is no longer max_progress
4178 * we need to freeze things
4180 sysfs_get_ll(info
, NULL
, "sync_max", &new_sync_max
);
4181 *frozen
= (new_sync_max
!= max_progress
);
4183 case -2: /* read error - abort */
4190 return rv
; /* abort */
4192 /* Maybe racing with array shutdown - check state */
4195 if (sysfs_get_str(info
, NULL
, "array_state", buf
,
4197 strncmp(buf
, "inactive", 8) == 0 ||
4198 strncmp(buf
, "clear",5) == 0)
4199 return -2; /* abort */
4200 return -1; /* complete */
4204 /* FIXME return status is never checked */
4205 static int grow_backup(struct mdinfo
*sra
,
4206 unsigned long long offset
, /* per device */
4207 unsigned long stripes
, /* per device, in old chunks */
4208 int *sources
, unsigned long long *offsets
,
4209 int disks
, int chunk
, int level
, int layout
,
4210 int dests
, int *destfd
, unsigned long long *destoffsets
,
4211 int part
, int *degraded
,
4214 /* Backup 'blocks' sectors at 'offset' on each device of the array,
4215 * to storage 'destfd' (offset 'destoffsets'), after first
4216 * suspending IO. Then allow resync to continue
4217 * over the suspended section.
4218 * Use part 'part' of the backup-super-block.
4223 unsigned long long ll
;
4225 //printf("offset %llu\n", offset);
4231 /* Check that array hasn't become degraded, else we might backup the wrong data */
4232 if (sysfs_get_ll(sra
, NULL
, "degraded", &ll
) < 0)
4233 return -1; /* FIXME this error is ignored */
4234 new_degraded
= (int)ll
;
4235 if (new_degraded
!= *degraded
) {
4236 /* check each device to ensure it is still working */
4238 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
4239 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
4241 if (sd
->disk
.state
& (1<<MD_DISK_SYNC
)) {
4244 if (sysfs_get_str(sra
, sd
, "state",
4245 sbuf
, sizeof(sbuf
)) < 0 ||
4246 strstr(sbuf
, "faulty") ||
4247 strstr(sbuf
, "in_sync") == NULL
) {
4248 /* this device is dead */
4249 sd
->disk
.state
= (1<<MD_DISK_FAULTY
);
4250 if (sd
->disk
.raid_disk
>= 0 &&
4251 sources
[sd
->disk
.raid_disk
] >= 0) {
4252 close(sources
[sd
->disk
.raid_disk
]);
4253 sources
[sd
->disk
.raid_disk
] = -1;
4258 *degraded
= new_degraded
;
4261 bsb
.arraystart2
= __cpu_to_le64(offset
* odata
);
4262 bsb
.length2
= __cpu_to_le64(stripes
* (chunk
/512) * odata
);
4264 bsb
.arraystart
= __cpu_to_le64(offset
* odata
);
4265 bsb
.length
= __cpu_to_le64(stripes
* (chunk
/512) * odata
);
4268 bsb
.magic
[15] = '2';
4269 for (i
= 0; i
< dests
; i
++)
4271 lseek64(destfd
[i
], destoffsets
[i
] + __le64_to_cpu(bsb
.devstart2
)*512, 0);
4273 lseek64(destfd
[i
], destoffsets
[i
], 0);
4275 rv
= save_stripes(sources
, offsets
,
4276 disks
, chunk
, level
, layout
,
4278 offset
*512*odata
, stripes
* chunk
* odata
,
4283 bsb
.mtime
= __cpu_to_le64(time(0));
4284 for (i
= 0; i
< dests
; i
++) {
4285 bsb
.devstart
= __cpu_to_le64(destoffsets
[i
]/512);
4287 bsb
.sb_csum
= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
));
4288 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0)
4289 bsb
.sb_csum2
= bsb_csum((char*)&bsb
,
4290 ((char*)&bsb
.sb_csum2
)-((char*)&bsb
));
4293 if ((unsigned long long)lseek64(destfd
[i
],
4294 destoffsets
[i
] - 4096, 0) !=
4295 destoffsets
[i
] - 4096)
4297 if (write(destfd
[i
], &bsb
, 512) != 512)
4299 if (destoffsets
[i
] > 4096) {
4300 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
]+stripes
*chunk
*odata
, 0) !=
4301 destoffsets
[i
]+stripes
*chunk
*odata
)
4303 if (write(destfd
[i
], &bsb
, 512) != 512)
4313 /* in 2.6.30, the value reported by sync_completed can be
4314 * less that it should be by one stripe.
4315 * This only happens when reshape hits sync_max and pauses.
4316 * So allow wait_backup to either extent sync_max further
4317 * than strictly necessary, or return before the
4318 * sync has got quite as far as we would really like.
4319 * This is what 'blocks2' is for.
4320 * The various caller give appropriate values so that
4323 /* FIXME return value is often ignored */
4324 static int forget_backup(int dests
, int *destfd
,
4325 unsigned long long *destoffsets
,
4329 * Erase backup 'part' (which is 0 or 1)
4335 bsb
.arraystart2
= __cpu_to_le64(0);
4336 bsb
.length2
= __cpu_to_le64(0);
4338 bsb
.arraystart
= __cpu_to_le64(0);
4339 bsb
.length
= __cpu_to_le64(0);
4341 bsb
.mtime
= __cpu_to_le64(time(0));
4343 for (i
= 0; i
< dests
; i
++) {
4344 bsb
.devstart
= __cpu_to_le64(destoffsets
[i
]/512);
4345 bsb
.sb_csum
= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
));
4346 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0)
4347 bsb
.sb_csum2
= bsb_csum((char*)&bsb
,
4348 ((char*)&bsb
.sb_csum2
)-((char*)&bsb
));
4349 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
]-4096, 0) !=
4350 destoffsets
[i
]-4096)
4353 write(destfd
[i
], &bsb
, 512) != 512)
4360 static void fail(char *msg
)
4363 rv
= (write(2, msg
, strlen(msg
)) != (int)strlen(msg
));
4364 rv
|= (write(2, "\n", 1) != 1);
4368 static char *abuf
, *bbuf
;
4369 static unsigned long long abuflen
;
4370 static void validate(int afd
, int bfd
, unsigned long long offset
)
4372 /* check that the data in the backup against the array.
4373 * This is only used for regression testing and should not
4374 * be used while the array is active
4378 lseek64(bfd
, offset
- 4096, 0);
4379 if (read(bfd
, &bsb2
, 512) != 512)
4380 fail("cannot read bsb");
4381 if (bsb2
.sb_csum
!= bsb_csum((char*)&bsb2
,
4382 ((char*)&bsb2
.sb_csum
)-((char*)&bsb2
)))
4383 fail("first csum bad");
4384 if (memcmp(bsb2
.magic
, "md_backup_data", 14) != 0)
4385 fail("magic is bad");
4386 if (memcmp(bsb2
.magic
, "md_backup_data-2", 16) == 0 &&
4387 bsb2
.sb_csum2
!= bsb_csum((char*)&bsb2
,
4388 ((char*)&bsb2
.sb_csum2
)-((char*)&bsb2
)))
4389 fail("second csum bad");
4391 if (__le64_to_cpu(bsb2
.devstart
)*512 != offset
)
4392 fail("devstart is wrong");
4395 unsigned long long len
= __le64_to_cpu(bsb2
.length
)*512;
4397 if (abuflen
< len
) {
4401 if (posix_memalign((void**)&abuf
, 4096, abuflen
) ||
4402 posix_memalign((void**)&bbuf
, 4096, abuflen
)) {
4404 /* just stop validating on mem-alloc failure */
4409 lseek64(bfd
, offset
, 0);
4410 if ((unsigned long long)read(bfd
, bbuf
, len
) != len
) {
4411 //printf("len %llu\n", len);
4412 fail("read first backup failed");
4414 lseek64(afd
, __le64_to_cpu(bsb2
.arraystart
)*512, 0);
4415 if ((unsigned long long)read(afd
, abuf
, len
) != len
)
4416 fail("read first from array failed");
4417 if (memcmp(bbuf
, abuf
, len
) != 0) {
4420 printf("offset=%llu len=%llu\n",
4421 (unsigned long long)__le64_to_cpu(bsb2
.arraystart
)*512, len
);
4422 for (i
=0; i
<len
; i
++)
4423 if (bbuf
[i
] != abuf
[i
]) {
4424 printf("first diff byte %d\n", i
);
4428 fail("data1 compare failed");
4432 unsigned long long len
= __le64_to_cpu(bsb2
.length2
)*512;
4434 if (abuflen
< len
) {
4438 abuf
= xmalloc(abuflen
);
4439 bbuf
= xmalloc(abuflen
);
4442 lseek64(bfd
, offset
+__le64_to_cpu(bsb2
.devstart2
)*512, 0);
4443 if ((unsigned long long)read(bfd
, bbuf
, len
) != len
)
4444 fail("read second backup failed");
4445 lseek64(afd
, __le64_to_cpu(bsb2
.arraystart2
)*512, 0);
4446 if ((unsigned long long)read(afd
, abuf
, len
) != len
)
4447 fail("read second from array failed");
4448 if (memcmp(bbuf
, abuf
, len
) != 0)
4449 fail("data2 compare failed");
4453 int child_monitor(int afd
, struct mdinfo
*sra
, struct reshape
*reshape
,
4454 struct supertype
*st
, unsigned long blocks
,
4455 int *fds
, unsigned long long *offsets
,
4456 int dests
, int *destfd
, unsigned long long *destoffsets
)
4458 /* Monitor a reshape where backup is being performed using
4459 * 'native' mechanism - either to a backup file, or
4460 * to some space in a spare.
4464 unsigned long long speed
;
4465 unsigned long long suspend_point
, array_size
;
4466 unsigned long long backup_point
, wait_point
;
4467 unsigned long long reshape_completed
;
4469 int increasing
= reshape
->after
.data_disks
>= reshape
->before
.data_disks
;
4470 int part
= 0; /* The next part of the backup area to fill. It may already
4471 * be full, so we need to check */
4472 int level
= reshape
->level
;
4473 int layout
= reshape
->before
.layout
;
4474 int data
= reshape
->before
.data_disks
;
4475 int disks
= reshape
->before
.data_disks
+ reshape
->parity
;
4476 int chunk
= sra
->array
.chunk_size
;
4478 unsigned long stripes
;
4482 /* set up the backup-super-block. This requires the
4483 * uuid from the array.
4485 /* Find a superblock */
4486 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
4490 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
4492 dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 1);
4493 devfd
= dev_open(dn
, O_RDONLY
);
4496 ok
= st
->ss
->load_super(st
, devfd
, NULL
);
4502 pr_err("Cannot find a superblock\n");
4506 memset(&bsb
, 0, 512);
4507 memcpy(bsb
.magic
, "md_backup_data-1", 16);
4508 st
->ss
->uuid_from_super(st
, uuid
);
4509 memcpy(bsb
.set_uuid
, uuid
, 16);
4510 bsb
.mtime
= __cpu_to_le64(time(0));
4511 bsb
.devstart2
= blocks
;
4513 stripes
= blocks
/ (sra
->array
.chunk_size
/512) /
4514 reshape
->before
.data_disks
;
4516 if (posix_memalign((void**)&buf
, 4096, disks
* chunk
))
4517 /* Don't start the 'reshape' */
4519 if (reshape
->before
.data_disks
== reshape
->after
.data_disks
) {
4520 sysfs_get_ll(sra
, NULL
, "sync_speed_min", &speed
);
4521 sysfs_set_num(sra
, NULL
, "sync_speed_min", 200000);
4525 array_size
= sra
->component_size
* reshape
->after
.data_disks
;
4526 backup_point
= sra
->reshape_progress
;
4529 array_size
= sra
->component_size
* reshape
->before
.data_disks
;
4530 backup_point
= reshape
->backup_blocks
;
4531 suspend_point
= array_size
;
4537 /* Want to return as soon the oldest backup slot can
4538 * be released as that allows us to start backing up
4539 * some more, providing suspend_point has been
4540 * advanced, which it should have.
4543 wait_point
= array_size
;
4544 if (part
== 0 && __le64_to_cpu(bsb
.length
) > 0)
4545 wait_point
= (__le64_to_cpu(bsb
.arraystart
) +
4546 __le64_to_cpu(bsb
.length
));
4547 if (part
== 1 && __le64_to_cpu(bsb
.length2
) > 0)
4548 wait_point
= (__le64_to_cpu(bsb
.arraystart2
) +
4549 __le64_to_cpu(bsb
.length2
));
4552 if (part
== 0 && __le64_to_cpu(bsb
.length
) > 0)
4553 wait_point
= __le64_to_cpu(bsb
.arraystart
);
4554 if (part
== 1 && __le64_to_cpu(bsb
.length2
) > 0)
4555 wait_point
= __le64_to_cpu(bsb
.arraystart2
);
4558 reshape_completed
= sra
->reshape_progress
;
4559 rv
= progress_reshape(sra
, reshape
,
4560 backup_point
, wait_point
,
4561 &suspend_point
, &reshape_completed
,
4563 /* external metadata would need to ping_monitor here */
4564 sra
->reshape_progress
= reshape_completed
;
4566 /* Clear any backup region that is before 'here' */
4568 if (__le64_to_cpu(bsb
.length
) > 0 &&
4569 reshape_completed
>= (__le64_to_cpu(bsb
.arraystart
) +
4570 __le64_to_cpu(bsb
.length
)))
4571 forget_backup(dests
, destfd
,
4573 if (__le64_to_cpu(bsb
.length2
) > 0 &&
4574 reshape_completed
>= (__le64_to_cpu(bsb
.arraystart2
) +
4575 __le64_to_cpu(bsb
.length2
)))
4576 forget_backup(dests
, destfd
,
4579 if (__le64_to_cpu(bsb
.length
) > 0 &&
4580 reshape_completed
<= (__le64_to_cpu(bsb
.arraystart
)))
4581 forget_backup(dests
, destfd
,
4583 if (__le64_to_cpu(bsb
.length2
) > 0 &&
4584 reshape_completed
<= (__le64_to_cpu(bsb
.arraystart2
)))
4585 forget_backup(dests
, destfd
,
4595 if (rv
== 0 && increasing
&& !st
->ss
->external
) {
4596 /* No longer need to monitor this reshape */
4597 sysfs_set_str(sra
, NULL
, "sync_max", "max");
4603 unsigned long long offset
;
4604 unsigned long actual_stripes
;
4605 /* Need to backup some data.
4606 * If 'part' is not used and the desired
4607 * backup size is suspended, do a backup,
4608 * then consider the next part.
4610 /* Check that 'part' is unused */
4611 if (part
== 0 && __le64_to_cpu(bsb
.length
) != 0)
4613 if (part
== 1 && __le64_to_cpu(bsb
.length2
) != 0)
4616 offset
= backup_point
/ data
;
4617 actual_stripes
= stripes
;
4619 if (offset
+ actual_stripes
* (chunk
/512) >
4620 sra
->component_size
)
4621 actual_stripes
= ((sra
->component_size
- offset
)
4623 if (offset
+ actual_stripes
* (chunk
/512) >
4627 if (offset
< actual_stripes
* (chunk
/512))
4628 actual_stripes
= offset
/ (chunk
/512);
4629 offset
-= actual_stripes
* (chunk
/512);
4630 if (offset
< suspend_point
/data
)
4633 if (actual_stripes
== 0)
4635 grow_backup(sra
, offset
, actual_stripes
,
4637 disks
, chunk
, level
, layout
,
4638 dests
, destfd
, destoffsets
,
4639 part
, °raded
, buf
);
4640 validate(afd
, destfd
[0], destoffsets
[0]);
4641 /* record where 'part' is up to */
4644 backup_point
+= actual_stripes
* (chunk
/512) * data
;
4646 backup_point
-= actual_stripes
* (chunk
/512) * data
;
4650 /* FIXME maybe call progress_reshape one more time instead */
4651 /* remove any remaining suspension */
4652 sysfs_set_num(sra
, NULL
, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL
);
4653 sysfs_set_num(sra
, NULL
, "suspend_hi", 0);
4654 sysfs_set_num(sra
, NULL
, "suspend_lo", 0);
4655 sysfs_set_num(sra
, NULL
, "sync_min", 0);
4657 if (reshape
->before
.data_disks
== reshape
->after
.data_disks
)
4658 sysfs_set_num(sra
, NULL
, "sync_speed_min", speed
);
4664 * If any spare contains md_back_data-1 which is recent wrt mtime,
4665 * write that data into the array and update the super blocks with
4666 * the new reshape_progress
4668 int Grow_restart(struct supertype
*st
, struct mdinfo
*info
, int *fdlist
, int cnt
,
4669 char *backup_file
, int verbose
)
4673 unsigned long long *offsets
;
4674 unsigned long long nstripe
, ostripe
;
4677 odata
= info
->array
.raid_disks
- info
->delta_disks
- 1;
4678 if (info
->array
.level
== 6) odata
--; /* number of data disks */
4679 ndata
= info
->array
.raid_disks
- 1;
4680 if (info
->new_level
== 6) ndata
--;
4682 old_disks
= info
->array
.raid_disks
- info
->delta_disks
;
4684 if (info
->delta_disks
<= 0)
4685 /* Didn't grow, so the backup file must have
4689 for (i
=old_disks
-(backup_file
?1:0); i
<cnt
; i
++) {
4690 struct mdinfo dinfo
;
4693 char *devname
, namebuf
[20];
4694 unsigned long long lo
, hi
;
4696 /* This was a spare and may have some saved data on it.
4697 * Load the superblock, find and load the
4698 * backup_super_block.
4699 * If either fail, go on to next device.
4700 * If the backup contains no new info, just return
4701 * else restore data and update all superblocks
4703 if (i
== old_disks
-1) {
4704 fd
= open(backup_file
, O_RDONLY
);
4706 pr_err("backup file %s inaccessible: %s\n",
4707 backup_file
, strerror(errno
));
4710 devname
= backup_file
;
4715 if (st
->ss
->load_super(st
, fd
, NULL
))
4718 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
4719 st
->ss
->free_super(st
);
4722 (dinfo
.data_offset
+ dinfo
.component_size
- 8) <<9,
4724 pr_err("Cannot seek on device %d\n", i
);
4725 continue; /* Cannot seek */
4727 sprintf(namebuf
, "device-%d", i
);
4730 if (read(fd
, &bsb
, sizeof(bsb
)) != sizeof(bsb
)) {
4732 pr_err("Cannot read from %s\n", devname
);
4733 continue; /* Cannot read */
4735 if (memcmp(bsb
.magic
, "md_backup_data-1", 16) != 0 &&
4736 memcmp(bsb
.magic
, "md_backup_data-2", 16) != 0) {
4738 pr_err("No backup metadata on %s\n", devname
);
4741 if (bsb
.sb_csum
!= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
))) {
4743 pr_err("Bad backup-metadata checksum on %s\n", devname
);
4744 continue; /* bad checksum */
4746 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0 &&
4747 bsb
.sb_csum2
!= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum2
)-((char*)&bsb
))) {
4749 pr_err("Bad backup-metadata checksum2 on %s\n", devname
);
4750 continue; /* Bad second checksum */
4752 if (memcmp(bsb
.set_uuid
,info
->uuid
, 16) != 0) {
4754 pr_err("Wrong uuid on backup-metadata on %s\n", devname
);
4755 continue; /* Wrong uuid */
4758 /* array utime and backup-mtime should be updated at much the same time, but it seems that
4759 * sometimes they aren't... So allow considerable flexability in matching, and allow
4760 * this test to be overridden by an environment variable.
4762 if(time_after(info
->array
.utime
, (unsigned int)__le64_to_cpu(bsb
.mtime
) + 2*60*60) ||
4763 time_before(info
->array
.utime
, (unsigned int)__le64_to_cpu(bsb
.mtime
) - 10*60)) {
4764 if (check_env("MDADM_GROW_ALLOW_OLD")) {
4765 pr_err("accepting backup with timestamp %lu for array with timestamp %lu\n",
4766 (unsigned long)__le64_to_cpu(bsb
.mtime
),
4767 (unsigned long)info
->array
.utime
);
4769 pr_err("too-old timestamp on backup-metadata on %s\n", devname
);
4770 pr_err("If you think it is should be safe, try 'export MDADM_GROW_ALLOW_OLD=1'\n");
4771 continue; /* time stamp is too bad */
4775 if (bsb
.magic
[15] == '1') {
4776 if (bsb
.length
== 0)
4778 if (info
->delta_disks
>= 0) {
4779 /* reshape_progress is increasing */
4780 if (__le64_to_cpu(bsb
.arraystart
)
4781 + __le64_to_cpu(bsb
.length
)
4782 < info
->reshape_progress
) {
4785 pr_err("backup-metadata found on %s but is not needed\n", devname
);
4786 continue; /* No new data here */
4789 /* reshape_progress is decreasing */
4790 if (__le64_to_cpu(bsb
.arraystart
) >=
4791 info
->reshape_progress
)
4792 goto nonew
; /* No new data here */
4795 if (bsb
.length
== 0 && bsb
.length2
== 0)
4797 if (info
->delta_disks
>= 0) {
4798 /* reshape_progress is increasing */
4799 if ((__le64_to_cpu(bsb
.arraystart
)
4800 + __le64_to_cpu(bsb
.length
)
4801 < info
->reshape_progress
) &&
4802 (__le64_to_cpu(bsb
.arraystart2
)
4803 + __le64_to_cpu(bsb
.length2
)
4804 < info
->reshape_progress
))
4805 goto nonew
; /* No new data here */
4807 /* reshape_progress is decreasing */
4808 if (__le64_to_cpu(bsb
.arraystart
) >=
4809 info
->reshape_progress
&&
4810 __le64_to_cpu(bsb
.arraystart2
) >=
4811 info
->reshape_progress
)
4812 goto nonew
; /* No new data here */
4815 if (lseek64(fd
, __le64_to_cpu(bsb
.devstart
)*512, 0)< 0) {
4818 pr_err("Failed to verify secondary backup-metadata block on %s\n",
4820 continue; /* Cannot seek */
4822 /* There should be a duplicate backup superblock 4k before here */
4823 if (lseek64(fd
, -4096, 1) < 0 ||
4824 read(fd
, &bsb2
, sizeof(bsb2
)) != sizeof(bsb2
))
4825 goto second_fail
; /* Cannot find leading superblock */
4826 if (bsb
.magic
[15] == '1')
4827 bsbsize
= offsetof(struct mdp_backup_super
, pad1
);
4829 bsbsize
= offsetof(struct mdp_backup_super
, pad
);
4830 if (memcmp(&bsb2
, &bsb
, bsbsize
) != 0)
4831 goto second_fail
; /* Cannot find leading superblock */
4833 /* Now need the data offsets for all devices. */
4834 offsets
= xmalloc(sizeof(*offsets
)*info
->array
.raid_disks
);
4835 for(j
=0; j
<info
->array
.raid_disks
; j
++) {
4838 if (st
->ss
->load_super(st
, fdlist
[j
], NULL
))
4839 /* FIXME should be this be an error */
4841 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
4842 st
->ss
->free_super(st
);
4843 offsets
[j
] = dinfo
.data_offset
* 512;
4845 printf("%s: restoring critical section\n", Name
);
4847 if (restore_stripes(fdlist
, offsets
,
4848 info
->array
.raid_disks
,
4852 fd
, __le64_to_cpu(bsb
.devstart
)*512,
4853 __le64_to_cpu(bsb
.arraystart
)*512,
4854 __le64_to_cpu(bsb
.length
)*512, NULL
)) {
4855 /* didn't succeed, so giveup */
4857 pr_err("Error restoring backup from %s\n",
4863 if (bsb
.magic
[15] == '2' &&
4864 restore_stripes(fdlist
, offsets
,
4865 info
->array
.raid_disks
,
4869 fd
, __le64_to_cpu(bsb
.devstart
)*512 +
4870 __le64_to_cpu(bsb
.devstart2
)*512,
4871 __le64_to_cpu(bsb
.arraystart2
)*512,
4872 __le64_to_cpu(bsb
.length2
)*512, NULL
)) {
4873 /* didn't succeed, so giveup */
4875 pr_err("Error restoring second backup from %s\n",
4883 /* Ok, so the data is restored. Let's update those superblocks. */
4887 lo
= __le64_to_cpu(bsb
.arraystart
);
4888 hi
= lo
+ __le64_to_cpu(bsb
.length
);
4890 if (bsb
.magic
[15] == '2' && bsb
.length2
) {
4891 unsigned long long lo1
, hi1
;
4892 lo1
= __le64_to_cpu(bsb
.arraystart2
);
4893 hi1
= lo1
+ __le64_to_cpu(bsb
.length2
);
4897 } else if (lo
< lo1
)
4903 (info
->reshape_progress
< lo
||
4904 info
->reshape_progress
> hi
))
4905 /* backup does not affect reshape_progress*/ ;
4906 else if (info
->delta_disks
>= 0) {
4907 info
->reshape_progress
= __le64_to_cpu(bsb
.arraystart
) +
4908 __le64_to_cpu(bsb
.length
);
4909 if (bsb
.magic
[15] == '2') {
4910 unsigned long long p2
= __le64_to_cpu(bsb
.arraystart2
) +
4911 __le64_to_cpu(bsb
.length2
);
4912 if (p2
> info
->reshape_progress
)
4913 info
->reshape_progress
= p2
;
4916 info
->reshape_progress
= __le64_to_cpu(bsb
.arraystart
);
4917 if (bsb
.magic
[15] == '2') {
4918 unsigned long long p2
= __le64_to_cpu(bsb
.arraystart2
);
4919 if (p2
< info
->reshape_progress
)
4920 info
->reshape_progress
= p2
;
4923 for (j
=0; j
<info
->array
.raid_disks
; j
++) {
4926 if (st
->ss
->load_super(st
, fdlist
[j
], NULL
))
4928 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
4929 dinfo
.reshape_progress
= info
->reshape_progress
;
4930 st
->ss
->update_super(st
, &dinfo
,
4931 "_reshape_progress",
4933 st
->ss
->store_super(st
, fdlist
[j
]);
4934 st
->ss
->free_super(st
);
4938 /* Didn't find any backup data, try to see if any
4941 if (info
->delta_disks
< 0) {
4942 /* When shrinking, the critical section is at the end.
4943 * So see if we are before the critical section.
4945 unsigned long long first_block
;
4946 nstripe
= ostripe
= 0;
4948 while (ostripe
>= nstripe
) {
4949 ostripe
+= info
->array
.chunk_size
/ 512;
4950 first_block
= ostripe
* odata
;
4951 nstripe
= first_block
/ ndata
/ (info
->new_chunk
/512) *
4952 (info
->new_chunk
/512);
4955 if (info
->reshape_progress
>= first_block
)
4958 if (info
->delta_disks
> 0) {
4959 /* See if we are beyond the critical section. */
4960 unsigned long long last_block
;
4961 nstripe
= ostripe
= 0;
4963 while (nstripe
>= ostripe
) {
4964 nstripe
+= info
->new_chunk
/ 512;
4965 last_block
= nstripe
* ndata
;
4966 ostripe
= last_block
/ odata
/ (info
->array
.chunk_size
/512) *
4967 (info
->array
.chunk_size
/512);
4970 if (info
->reshape_progress
>= last_block
)
4973 /* needed to recover critical section! */
4975 pr_err("Failed to find backup of critical section\n");
4979 int Grow_continue_command(char *devname
, int fd
,
4980 char *backup_file
, int verbose
)
4983 struct supertype
*st
= NULL
;
4984 struct mdinfo
*content
= NULL
;
4985 struct mdinfo array
;
4986 char *subarray
= NULL
;
4987 struct mdinfo
*cc
= NULL
;
4988 struct mdstat_ent
*mdstat
= NULL
;
4992 dprintf("Grow continue from command line called for %s\n",
4995 st
= super_by_fd(fd
, &subarray
);
4996 if (!st
|| !st
->ss
) {
4997 pr_err("Unable to determine metadata format for %s\n",
5001 dprintf("Grow continue is run for ");
5002 if (st
->ss
->external
== 0) {
5005 dprintf_cont("native array (%s)\n", devname
);
5006 if (md_get_array_info(fd
, &array
.array
) < 0) {
5007 pr_err("%s is not an active md array - aborting\n",
5010 goto Grow_continue_command_exit
;
5013 sysfs_init(content
, fd
, NULL
);
5014 /* Need to load a superblock.
5015 * FIXME we should really get what we need from
5019 for (d
= 0; d
< MAX_DISKS
; d
++) {
5020 mdu_disk_info_t disk
;
5024 if (md_get_disk_info(fd
, &disk
) < 0)
5026 if (disk
.major
== 0 && disk
.minor
== 0)
5028 if ((disk
.state
& (1 << MD_DISK_ACTIVE
)) == 0)
5030 dv
= map_dev(disk
.major
, disk
.minor
, 1);
5033 fd2
= dev_open(dv
, O_RDONLY
);
5036 err
= st
->ss
->load_super(st
, fd2
, NULL
);
5042 if (d
== MAX_DISKS
) {
5043 pr_err("Unable to load metadata for %s\n",
5046 goto Grow_continue_command_exit
;
5048 st
->ss
->getinfo_super(st
, content
, NULL
);
5049 if (!content
->reshape_active
)
5053 } while (cnt
-- > 0);
5058 dprintf_cont("subarray (%s)\n", subarray
);
5059 container
= st
->container_devnm
;
5060 cfd
= open_dev_excl(st
->container_devnm
);
5062 container
= st
->devnm
;
5064 cfd
= open_dev_excl(st
->devnm
);
5065 dprintf_cont("container (%s)\n", container
);
5069 pr_err("Unable to open container for %s\n", devname
);
5071 goto Grow_continue_command_exit
;
5074 /* find in container array under reshape
5076 ret_val
= st
->ss
->load_container(st
, cfd
, NULL
);
5078 pr_err("Cannot read superblock for %s\n",
5081 goto Grow_continue_command_exit
;
5084 cc
= st
->ss
->container_content(st
, subarray
);
5085 for (content
= cc
; content
; content
= content
->next
) {
5087 int allow_reshape
= 1;
5089 if (content
->reshape_active
== 0)
5091 /* The decision about array or container wide
5092 * reshape is taken in Grow_continue based
5093 * content->reshape_active state, therefore we
5094 * need to check_reshape based on
5095 * reshape_active and subarray name
5097 if (content
->array
.state
& (1<<MD_SB_BLOCK_VOLUME
))
5099 if (content
->reshape_active
== CONTAINER_RESHAPE
&&
5100 (content
->array
.state
5101 & (1<<MD_SB_BLOCK_CONTAINER_RESHAPE
)))
5104 if (!allow_reshape
) {
5105 pr_err("cannot continue reshape of an array in container with unsupported metadata: %s(%s)\n",
5106 devname
, container
);
5108 goto Grow_continue_command_exit
;
5111 array_name
= strchr(content
->text_version
+1, '/')+1;
5112 mdstat
= mdstat_by_subdev(array_name
, container
);
5115 if (mdstat
->active
== 0) {
5116 pr_err("Skipping inactive array %s.\n",
5118 free_mdstat(mdstat
);
5125 pr_err("Unable to determine reshaped array for %s\n", devname
);
5127 goto Grow_continue_command_exit
;
5129 fd2
= open_dev(mdstat
->devnm
);
5131 pr_err("cannot open (%s)\n", mdstat
->devnm
);
5133 goto Grow_continue_command_exit
;
5136 if (sysfs_init(content
, fd2
, mdstat
->devnm
)) {
5137 pr_err("Unable to initialize sysfs for %s, Grow cannot continue",
5141 goto Grow_continue_command_exit
;
5146 /* start mdmon in case it is not running
5148 if (!mdmon_running(container
))
5149 start_mdmon(container
);
5150 ping_monitor(container
);
5152 if (mdmon_running(container
))
5153 st
->update_tail
= &st
->updates
;
5155 pr_err("No mdmon found. Grow cannot continue.\n");
5157 goto Grow_continue_command_exit
;
5161 /* verify that array under reshape is started from
5164 if (verify_reshape_position(content
, content
->array
.level
) < 0) {
5166 goto Grow_continue_command_exit
;
5171 ret_val
= Grow_continue(fd
, st
, content
, backup_file
, 1, 0);
5173 Grow_continue_command_exit
:
5176 st
->ss
->free_super(st
);
5177 free_mdstat(mdstat
);
5184 int Grow_continue(int mdfd
, struct supertype
*st
, struct mdinfo
*info
,
5185 char *backup_file
, int forked
, int freeze_reshape
)
5189 if (!info
->reshape_active
)
5192 if (st
->ss
->external
) {
5193 int cfd
= open_dev(st
->container_devnm
);
5198 st
->ss
->load_container(st
, cfd
, st
->container_devnm
);
5200 ret_val
= reshape_container(st
->container_devnm
, NULL
, mdfd
,
5201 st
, info
, 0, backup_file
,
5203 1 | info
->reshape_active
,
5206 ret_val
= reshape_array(NULL
, mdfd
, "array", st
, info
, 1,
5207 NULL
, INVALID_SECTORS
,
5208 backup_file
, 0, forked
,
5209 1 | info
->reshape_active
,
5215 char *make_backup(char *name
)
5217 char *base
= "backup_file-";
5221 len
= strlen(MAP_DIR
) + 1 + strlen(base
) + strlen(name
)+1;
5222 fname
= xmalloc(len
);
5223 sprintf(fname
, "%s/%s%s", MAP_DIR
, base
, name
);
5227 char *locate_backup(char *name
)
5229 char *fl
= make_backup(name
);
5232 if (stat(fl
, &stb
) == 0 &&
5233 S_ISREG(stb
.st_mode
))