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
);
149 if ((stb
.st_mode
& S_IFMT
) != S_IFBLK
) {
150 pr_err("%s is not a block device!\n", newdev
);
155 /* now check out all the devices and make sure we can read the
157 for (d
=0 ; d
< info
.array
.raid_disks
; d
++) {
158 mdu_disk_info_t disk
;
161 st
->ss
->free_super(st
);
164 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0) {
165 pr_err("cannot get device detail for device %d\n",
171 dv
= map_dev(disk
.major
, disk
.minor
, 1);
173 pr_err("cannot find device file for device %d\n",
179 fd2
= dev_open(dv
, O_RDWR
);
181 pr_err("cannot open device file %s\n", dv
);
187 if (st
->ss
->load_super(st
, fd2
, NULL
)) {
188 pr_err("cannot find super block on %s\n", dv
);
196 /* Ok, looks good. Lets update the superblock and write it out to
200 info
.disk
.number
= d
;
201 info
.disk
.major
= major(stb
.st_rdev
);
202 info
.disk
.minor
= minor(stb
.st_rdev
);
203 info
.disk
.raid_disk
= d
;
204 info
.disk
.state
= (1 << MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
);
205 st
->ss
->update_super(st
, &info
, "linear-grow-new", newdev
,
208 if (st
->ss
->store_super(st
, nfd
)) {
209 pr_err("Cannot store new superblock on %s\n",
216 if (ioctl(fd
, ADD_NEW_DISK
, &info
.disk
) != 0) {
217 pr_err("Cannot add new disk to this array\n");
220 /* Well, that seems to have worked.
221 * Now go through and update all superblocks
224 if (md_get_array_info(fd
, &info
.array
) < 0) {
225 pr_err("cannot get array info for %s\n", devname
);
230 for (d
=0 ; d
< info
.array
.raid_disks
; d
++) {
231 mdu_disk_info_t disk
;
235 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0) {
236 pr_err("cannot get device detail for device %d\n",
240 dv
= map_dev(disk
.major
, disk
.minor
, 1);
242 pr_err("cannot find device file for device %d\n",
246 fd2
= dev_open(dv
, O_RDWR
);
248 pr_err("cannot open device file %s\n", dv
);
251 if (st
->ss
->load_super(st
, fd2
, NULL
)) {
252 pr_err("cannot find super block on %s\n", dv
);
256 info
.array
.raid_disks
= nd
+1;
257 info
.array
.nr_disks
= nd
+1;
258 info
.array
.active_disks
= nd
+1;
259 info
.array
.working_disks
= nd
+1;
261 st
->ss
->update_super(st
, &info
, "linear-grow-update", dv
,
264 if (st
->ss
->store_super(st
, fd2
)) {
265 pr_err("Cannot store new superblock on %s\n", dv
);
275 int Grow_addbitmap(char *devname
, int fd
, struct context
*c
, struct shape
*s
)
278 * First check that array doesn't have a bitmap
279 * Then create the bitmap
282 * For internal bitmaps, we need to check the version,
283 * find all the active devices, and write the bitmap block
286 mdu_bitmap_file_t bmf
;
287 mdu_array_info_t array
;
288 struct supertype
*st
;
289 char *subarray
= NULL
;
290 int major
= BITMAP_MAJOR_HI
;
291 int vers
= md_get_version(fd
);
292 unsigned long long bitmapsize
, array_size
;
296 major
= BITMAP_MAJOR_HOSTENDIAN
;
297 pr_err("Warning - bitmaps created on this kernel are not portable\n"
298 " between different architectures. Consider upgrading the Linux kernel.\n");
302 * We only ever get called if s->bitmap_file is != NULL, so this check
303 * is just here to quiet down static code checkers.
308 if (strcmp(s
->bitmap_file
, "clustered") == 0)
309 major
= BITMAP_MAJOR_CLUSTERED
;
311 if (ioctl(fd
, GET_BITMAP_FILE
, &bmf
) != 0) {
313 pr_err("Memory allocation failure.\n");
315 pr_err("bitmaps not supported by this kernel.\n");
318 if (bmf
.pathname
[0]) {
319 if (strcmp(s
->bitmap_file
,"none") == 0) {
320 if (ioctl(fd
, SET_BITMAP_FILE
, -1) != 0) {
321 pr_err("failed to remove bitmap %s\n",
327 pr_err("%s already has a bitmap (%s)\n",
328 devname
, bmf
.pathname
);
331 if (md_get_array_info(fd
, &array
) != 0) {
332 pr_err("cannot get array status for %s\n", devname
);
335 if (array
.state
& (1 << MD_SB_BITMAP_PRESENT
)) {
336 if (strcmp(s
->bitmap_file
, "none")==0) {
337 array
.state
&= ~(1 << MD_SB_BITMAP_PRESENT
);
338 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
339 if (array
.state
& (1 << MD_SB_CLUSTERED
))
340 pr_err("failed to remove clustered bitmap.\n");
342 pr_err("failed to remove internal bitmap.\n");
347 pr_err("bitmap already present on %s\n", devname
);
351 if (strcmp(s
->bitmap_file
, "none") == 0) {
352 pr_err("no bitmap found on %s\n", devname
);
355 if (array
.level
<= 0) {
356 pr_err("Bitmaps not meaningful with level %s\n",
357 map_num(pers
, array
.level
)?:"of this array");
360 bitmapsize
= array
.size
;
362 if (get_dev_size(fd
, NULL
, &array_size
) &&
363 array_size
> (0x7fffffffULL
<< 9)) {
364 /* Array is big enough that we cannot trust array.size
365 * try other approaches
367 bitmapsize
= get_component_size(fd
);
369 if (bitmapsize
== 0) {
370 pr_err("Cannot reliably determine size of array to create bitmap - sorry.\n");
374 if (array
.level
== 10) {
377 ncopies
= (array
.layout
& 255) * ((array
.layout
>> 8) & 255);
378 bitmapsize
= bitmapsize
* array
.raid_disks
/ ncopies
;
381 st
= super_by_fd(fd
, &subarray
);
383 pr_err("Cannot understand version %d.%d\n",
384 array
.major_version
, array
.minor_version
);
388 pr_err("Cannot add bitmaps to sub-arrays yet\n");
394 mdi
= sysfs_read(fd
, NULL
, GET_CONSISTENCY_POLICY
);
396 if (mdi
->consistency_policy
== CONSISTENCY_POLICY_PPL
) {
397 pr_err("Cannot add bitmap to array with PPL\n");
405 if (strcmp(s
->bitmap_file
, "internal") == 0 ||
406 strcmp(s
->bitmap_file
, "clustered") == 0) {
409 int offset_setable
= 0;
410 if (st
->ss
->add_internal_bitmap
== NULL
) {
411 pr_err("Internal bitmaps not supported with %s metadata\n", st
->ss
->name
);
414 st
->nodes
= c
->nodes
;
415 st
->cluster_name
= c
->homecluster
;
416 mdi
= sysfs_read(fd
, NULL
, GET_BITMAP_LOCATION
);
419 for (d
= 0; d
< st
->max_devs
; d
++) {
420 mdu_disk_info_t disk
;
425 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
427 if (disk
.major
== 0 && disk
.minor
== 0)
429 if ((disk
.state
& (1 << MD_DISK_SYNC
)) == 0)
431 dv
= map_dev(disk
.major
, disk
.minor
, 1);
434 fd2
= dev_open(dv
, O_RDWR
);
437 rv
= st
->ss
->load_super(st
, fd2
, NULL
);
439 rv
= st
->ss
->add_internal_bitmap(
440 st
, &s
->bitmap_chunk
, c
->delay
,
441 s
->write_behind
, bitmapsize
,
442 offset_setable
, major
);
444 st
->ss
->write_bitmap(st
, fd2
,
447 pr_err("failed to create internal bitmap - chunksize problem.\n");
450 pr_err("failed to load super-block.\n");
456 if (offset_setable
) {
457 st
->ss
->getinfo_super(st
, mdi
, NULL
);
458 sysfs_init(mdi
, fd
, NULL
);
459 rv
= sysfs_set_num_signed(mdi
, NULL
, "bitmap/location",
463 if (strcmp(s
->bitmap_file
, "clustered") == 0)
464 array
.state
|= (1 << MD_SB_CLUSTERED
);
465 array
.state
|= (1 << MD_SB_BITMAP_PRESENT
);
466 rv
= ioctl(fd
, SET_ARRAY_INFO
, &array
);
470 pr_err("Cannot add bitmap while array is resyncing or reshaping etc.\n");
471 pr_err("failed to set internal bitmap.\n");
478 int max_devs
= st
->max_devs
;
480 /* try to load a superblock */
481 for (d
= 0; d
< max_devs
; d
++) {
482 mdu_disk_info_t disk
;
486 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
488 if ((disk
.major
==0 && disk
.minor
== 0) ||
489 (disk
.state
& (1 << MD_DISK_REMOVED
)))
491 dv
= map_dev(disk
.major
, disk
.minor
, 1);
494 fd2
= dev_open(dv
, O_RDONLY
);
496 if (st
->ss
->load_super(st
, fd2
, NULL
) == 0) {
498 st
->ss
->uuid_from_super(st
, uuid
);
505 pr_err("cannot find UUID for array!\n");
508 if (CreateBitmap(s
->bitmap_file
, c
->force
, (char*)uuid
,
509 s
->bitmap_chunk
, c
->delay
, s
->write_behind
,
510 bitmapsize
, major
)) {
513 bitmap_fd
= open(s
->bitmap_file
, O_RDWR
);
515 pr_err("weird: %s cannot be opened\n", s
->bitmap_file
);
518 if (ioctl(fd
, SET_BITMAP_FILE
, bitmap_fd
) < 0) {
521 pr_err("Cannot add bitmap while array is resyncing or reshaping etc.\n");
522 pr_err("Cannot set bitmap file for %s: %s\n",
523 devname
, strerror(err
));
531 int Grow_consistency_policy(char *devname
, int fd
, struct context
*c
, struct shape
*s
)
533 struct supertype
*st
;
536 char *subarray
= NULL
;
538 char container_dev
[PATH_MAX
];
540 if (s
->consistency_policy
!= CONSISTENCY_POLICY_RESYNC
&&
541 s
->consistency_policy
!= CONSISTENCY_POLICY_PPL
) {
542 pr_err("Operation not supported for consistency policy %s\n",
543 map_num(consistency_policies
, s
->consistency_policy
));
547 st
= super_by_fd(fd
, &subarray
);
551 sra
= sysfs_read(fd
, NULL
, GET_CONSISTENCY_POLICY
|GET_LEVEL
|
558 if (s
->consistency_policy
== CONSISTENCY_POLICY_PPL
&&
559 !st
->ss
->write_init_ppl
) {
560 pr_err("%s metadata does not support PPL\n", st
->ss
->name
);
565 if (sra
->array
.level
!= 5) {
566 pr_err("Operation not supported for array level %d\n",
572 if (sra
->consistency_policy
== (unsigned)s
->consistency_policy
) {
573 pr_err("Consistency policy is already %s\n",
574 map_num(consistency_policies
, s
->consistency_policy
));
577 } else if (sra
->consistency_policy
!= CONSISTENCY_POLICY_RESYNC
&&
578 sra
->consistency_policy
!= CONSISTENCY_POLICY_PPL
) {
579 pr_err("Current consistency policy is %s, cannot change to %s\n",
580 map_num(consistency_policies
, sra
->consistency_policy
),
581 map_num(consistency_policies
, s
->consistency_policy
));
589 if (s
->consistency_policy
== CONSISTENCY_POLICY_PPL
)
594 sprintf(container_dev
, "/dev/%s", st
->container_devnm
);
596 ret
= Update_subarray(container_dev
, subarray
, update
, NULL
,
602 if (s
->consistency_policy
== CONSISTENCY_POLICY_PPL
) {
609 cfd
= open(container_dev
, O_RDWR
|O_EXCL
);
611 pr_err("Failed to open %s\n", container_dev
);
616 ret
= st
->ss
->load_container(st
, cfd
, st
->container_devnm
);
620 pr_err("Cannot read superblock for %s\n",
625 mdi
= st
->ss
->container_content(st
, subarray
);
630 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
634 if ((sd
->disk
.state
& (1 << MD_DISK_SYNC
)) == 0)
637 devpath
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 0);
638 dfd
= dev_open(devpath
, O_RDWR
);
640 pr_err("Failed to open %s\n", devpath
);
646 ret
= st
->ss
->load_super(st
, dfd
, NULL
);
648 pr_err("Failed to load super-block.\n");
653 ret
= st
->ss
->update_super(st
, sra
, "ppl", devname
,
654 c
->verbose
, 0, NULL
);
657 st
->ss
->free_super(st
);
660 st
->ss
->getinfo_super(st
, &info
, NULL
);
663 ret
|= sysfs_set_num(sra
, sd
, "ppl_sector", info
.ppl_sector
);
664 ret
|= sysfs_set_num(sra
, sd
, "ppl_size", info
.ppl_size
);
667 pr_err("Failed to set PPL attributes for %s\n",
670 st
->ss
->free_super(st
);
674 ret
= st
->ss
->write_init_ppl(st
, &info
, dfd
);
676 pr_err("Failed to write PPL\n");
681 st
->ss
->free_super(st
);
688 ret
= sysfs_set_str(sra
, NULL
, "consistency_policy",
689 map_num(consistency_policies
,
690 s
->consistency_policy
));
692 pr_err("Failed to change array consistency policy\n");
704 * When reshaping an array we might need to backup some data.
705 * This is written to all spares with a 'super_block' describing it.
706 * The superblock goes 4K from the end of the used space on the
708 * It if written after the backup is complete.
709 * It has the following structure.
712 static struct mdp_backup_super
{
713 char magic
[16]; /* md_backup_data-1 or -2 */
716 /* start/sizes in 512byte sectors */
717 __u64 devstart
; /* address on backup device/file of data */
720 __u32 sb_csum
; /* csum of preceeding bytes. */
722 __u64 devstart2
; /* offset in to data of second section */
725 __u32 sb_csum2
; /* csum of preceeding bytes. */
727 } __attribute__((aligned(512))) bsb
, bsb2
;
729 static __u32
bsb_csum(char *buf
, int len
)
733 for (i
= 0; i
< len
; i
++)
734 csum
= (csum
<<3) + buf
[0];
735 return __cpu_to_le32(csum
);
738 static int check_idle(struct supertype
*st
)
740 /* Check that all member arrays for this container, or the
741 * container of this array, are idle
743 char *container
= (st
->container_devnm
[0]
744 ? st
->container_devnm
: st
->devnm
);
745 struct mdstat_ent
*ent
, *e
;
748 ent
= mdstat_read(0, 0);
749 for (e
= ent
; e
; e
= e
->next
) {
750 if (!is_container_member(e
, container
))
752 if (e
->percent
>= 0) {
761 static int freeze_container(struct supertype
*st
)
763 char *container
= (st
->container_devnm
[0]
764 ? st
->container_devnm
: st
->devnm
);
769 if (block_monitor(container
, 1)) {
770 pr_err("failed to freeze container\n");
777 static void unfreeze_container(struct supertype
*st
)
779 char *container
= (st
->container_devnm
[0]
780 ? st
->container_devnm
: st
->devnm
);
782 unblock_monitor(container
, 1);
785 static int freeze(struct supertype
*st
)
787 /* Try to freeze resync/rebuild on this array/container.
788 * Return -1 if the array is busy,
789 * return -2 container cannot be frozen,
790 * return 0 if this kernel doesn't support 'frozen'
791 * return 1 if it worked.
793 if (st
->ss
->external
)
794 return freeze_container(st
);
796 struct mdinfo
*sra
= sysfs_read(-1, st
->devnm
, GET_VERSION
);
802 /* Need to clear any 'read-auto' status */
803 if (sysfs_get_str(sra
, NULL
, "array_state", buf
, 20) > 0 &&
804 strncmp(buf
, "read-auto", 9) == 0)
805 sysfs_set_str(sra
, NULL
, "array_state", "clean");
807 err
= sysfs_freeze_array(sra
);
813 static void unfreeze(struct supertype
*st
)
815 if (st
->ss
->external
)
816 return unfreeze_container(st
);
818 struct mdinfo
*sra
= sysfs_read(-1, st
->devnm
, GET_VERSION
);
822 sysfs_get_str(sra
, NULL
, "sync_action", buf
, 20) > 0
823 && strcmp(buf
, "frozen\n") == 0)
824 sysfs_set_str(sra
, NULL
, "sync_action", "idle");
829 static void wait_reshape(struct mdinfo
*sra
)
831 int fd
= sysfs_get_fd(sra
, NULL
, "sync_action");
837 while (sysfs_fd_get_str(fd
, action
, 20) > 0 &&
838 strncmp(action
, "reshape", 7) == 0)
839 sysfs_wait(fd
, NULL
);
843 static int reshape_super(struct supertype
*st
, unsigned long long size
,
844 int level
, int layout
, int chunksize
, int raid_disks
,
845 int delta_disks
, char *backup_file
, char *dev
,
846 int direction
, int verbose
)
848 /* nothing extra to check in the native case */
849 if (!st
->ss
->external
)
851 if (!st
->ss
->reshape_super
||
852 !st
->ss
->manage_reshape
) {
853 pr_err("%s metadata does not support reshape\n",
858 return st
->ss
->reshape_super(st
, size
, level
, layout
, chunksize
,
859 raid_disks
, delta_disks
, backup_file
, dev
,
863 static void sync_metadata(struct supertype
*st
)
865 if (st
->ss
->external
) {
866 if (st
->update_tail
) {
867 flush_metadata_updates(st
);
868 st
->update_tail
= &st
->updates
;
870 st
->ss
->sync_metadata(st
);
874 static int subarray_set_num(char *container
, struct mdinfo
*sra
, char *name
, int n
)
876 /* when dealing with external metadata subarrays we need to be
877 * prepared to handle EAGAIN. The kernel may need to wait for
878 * mdmon to mark the array active so the kernel can handle
879 * allocations/writeback when preparing the reshape action
880 * (md_allow_write()). We temporarily disable safe_mode_delay
881 * to close a race with the array_state going clean before the
882 * next write to raid_disks / stripe_cache_size
887 /* only 'raid_disks' and 'stripe_cache_size' trigger md_allow_write */
889 (strcmp(name
, "raid_disks") != 0 &&
890 strcmp(name
, "stripe_cache_size") != 0))
891 return sysfs_set_num(sra
, NULL
, name
, n
);
893 rc
= sysfs_get_str(sra
, NULL
, "safe_mode_delay", safe
, sizeof(safe
));
896 sysfs_set_num(sra
, NULL
, "safe_mode_delay", 0);
897 rc
= sysfs_set_num(sra
, NULL
, name
, n
);
898 if (rc
< 0 && errno
== EAGAIN
) {
899 ping_monitor(container
);
900 /* if we get EAGAIN here then the monitor is not active
903 rc
= sysfs_set_num(sra
, NULL
, name
, n
);
905 sysfs_set_str(sra
, NULL
, "safe_mode_delay", safe
);
909 int start_reshape(struct mdinfo
*sra
, int already_running
,
910 int before_data_disks
, int data_disks
)
913 unsigned long long sync_max_to_set
;
915 sysfs_set_num(sra
, NULL
, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL
);
916 err
= sysfs_set_num(sra
, NULL
, "suspend_hi", sra
->reshape_progress
);
917 err
= err
?: sysfs_set_num(sra
, NULL
, "suspend_lo",
918 sra
->reshape_progress
);
919 if (before_data_disks
<= data_disks
)
920 sync_max_to_set
= sra
->reshape_progress
/ data_disks
;
922 sync_max_to_set
= (sra
->component_size
* data_disks
923 - sra
->reshape_progress
) / data_disks
;
924 if (!already_running
)
925 sysfs_set_num(sra
, NULL
, "sync_min", sync_max_to_set
);
926 err
= err
?: sysfs_set_num(sra
, NULL
, "sync_max", sync_max_to_set
);
927 if (!already_running
&& err
== 0) {
930 err
= sysfs_set_str(sra
, NULL
, "sync_action", "reshape");
933 } while (err
&& errno
== EBUSY
&& cnt
-- > 0);
938 void abort_reshape(struct mdinfo
*sra
)
940 sysfs_set_str(sra
, NULL
, "sync_action", "idle");
942 * Prior to kernel commit: 23ddff3792f6 ("md: allow suspend_lo and
943 * suspend_hi to decrease as well as increase.")
944 * you could only increase suspend_{lo,hi} unless the region they
945 * covered was empty. So to reset to 0, you need to push suspend_lo
946 * up past suspend_hi first. So to maximize the chance of mdadm
947 * working on all kernels, we want to keep doing that.
949 sysfs_set_num(sra
, NULL
, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL
);
950 sysfs_set_num(sra
, NULL
, "suspend_hi", 0);
951 sysfs_set_num(sra
, NULL
, "suspend_lo", 0);
952 sysfs_set_num(sra
, NULL
, "sync_min", 0);
953 // It isn't safe to reset sync_max as we aren't monitoring.
954 // Array really should be stopped at this point.
957 int remove_disks_for_takeover(struct supertype
*st
,
962 struct mdinfo
*remaining
;
965 if (st
->ss
->external
) {
967 struct mdinfo
*arrays
= st
->ss
->container_content(st
, NULL
);
969 * containter_content returns list of arrays in container
970 * If arrays->next is not NULL it means that there are
971 * 2 arrays in container and operation should be blocked
978 pr_err("Error. Cannot perform operation on /dev/%s\n", st
->devnm
);
979 pr_err("For this operation it MUST be single array in container\n");
985 if (sra
->array
.level
== 10)
986 nr_of_copies
= layout
& 0xff;
987 else if (sra
->array
.level
== 1)
988 nr_of_copies
= sra
->array
.raid_disks
;
992 remaining
= sra
->devs
;
994 /* for each 'copy', select one device and remove from the list. */
995 for (slot
= 0; slot
< sra
->array
.raid_disks
; slot
+= nr_of_copies
) {
996 struct mdinfo
**diskp
;
999 /* Find a working device to keep */
1000 for (diskp
= &remaining
; *diskp
; diskp
= &(*diskp
)->next
) {
1001 struct mdinfo
*disk
= *diskp
;
1003 if (disk
->disk
.raid_disk
< slot
)
1005 if (disk
->disk
.raid_disk
>= slot
+ nr_of_copies
)
1007 if (disk
->disk
.state
& (1<<MD_DISK_REMOVED
))
1009 if (disk
->disk
.state
& (1<<MD_DISK_FAULTY
))
1011 if (!(disk
->disk
.state
& (1<<MD_DISK_SYNC
)))
1014 /* We have found a good disk to use! */
1015 *diskp
= disk
->next
;
1016 disk
->next
= sra
->devs
;
1025 if (slot
< sra
->array
.raid_disks
) {
1026 /* didn't find all slots */
1032 sra
->devs
= remaining
;
1036 /* Remove all 'remaining' devices from the array */
1038 struct mdinfo
*sd
= remaining
;
1039 remaining
= sd
->next
;
1041 sysfs_set_str(sra
, sd
, "state", "faulty");
1042 sysfs_set_str(sra
, sd
, "slot", "none");
1043 /* for external metadata disks should be removed in mdmon */
1044 if (!st
->ss
->external
)
1045 sysfs_set_str(sra
, sd
, "state", "remove");
1046 sd
->disk
.state
|= (1<<MD_DISK_REMOVED
);
1047 sd
->disk
.state
&= ~(1<<MD_DISK_SYNC
);
1048 sd
->next
= sra
->devs
;
1054 void reshape_free_fdlist(int *fdlist
,
1055 unsigned long long *offsets
,
1060 for (i
= 0; i
< size
; i
++)
1068 int reshape_prepare_fdlist(char *devname
,
1072 unsigned long blocks
,
1075 unsigned long long *offsets
)
1080 enable_fds(nrdisks
);
1081 for (d
= 0; d
<= nrdisks
; d
++)
1084 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
1085 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
1087 if (sd
->disk
.state
& (1<<MD_DISK_SYNC
) &&
1088 sd
->disk
.raid_disk
< raid_disks
) {
1089 char *dn
= map_dev(sd
->disk
.major
,
1091 fdlist
[sd
->disk
.raid_disk
]
1092 = dev_open(dn
, O_RDONLY
);
1093 offsets
[sd
->disk
.raid_disk
] = sd
->data_offset
*512;
1094 if (fdlist
[sd
->disk
.raid_disk
] < 0) {
1095 pr_err("%s: cannot open component %s\n",
1096 devname
, dn
? dn
: "-unknown-");
1100 } else if (backup_file
== NULL
) {
1102 char *dn
= map_dev(sd
->disk
.major
,
1104 fdlist
[d
] = dev_open(dn
, O_RDWR
);
1105 offsets
[d
] = (sd
->data_offset
+ sra
->component_size
- blocks
- 8)*512;
1106 if (fdlist
[d
] < 0) {
1107 pr_err("%s: cannot open component %s\n",
1108 devname
, dn
? dn
: "-unknown-");
1119 int reshape_open_backup_file(char *backup_file
,
1124 unsigned long long *offsets
,
1128 /* Return 1 on success, 0 on any form of failure */
1129 /* need to check backup file is large enough */
1135 *fdlist
= open(backup_file
, O_RDWR
|O_CREAT
|(restart
? O_TRUNC
: O_EXCL
),
1139 pr_err("%s: cannot create backup file %s: %s\n",
1140 devname
, backup_file
, strerror(errno
));
1143 /* Guard against backup file being on array device.
1144 * If array is partitioned or if LVM etc is in the
1145 * way this will not notice, but it is better than
1148 fstat(*fdlist
, &stb
);
1151 if (stb
.st_rdev
== dev
) {
1152 pr_err("backup file must NOT be on the array being reshaped.\n");
1157 memset(buf
, 0, 512);
1158 for (i
=0; i
< blocks
+ 8 ; i
++) {
1159 if (write(*fdlist
, buf
, 512) != 512) {
1160 pr_err("%s: cannot create backup file %s: %s\n",
1161 devname
, backup_file
, strerror(errno
));
1165 if (fsync(*fdlist
) != 0) {
1166 pr_err("%s: cannot create backup file %s: %s\n",
1167 devname
, backup_file
, strerror(errno
));
1171 if (!restart
&& strncmp(backup_file
, MAP_DIR
, strlen(MAP_DIR
)) != 0) {
1172 char *bu
= make_backup(sys_name
);
1173 if (symlink(backup_file
, bu
))
1174 pr_err("Recording backup file in " MAP_DIR
" failed: %s\n",
1182 unsigned long compute_backup_blocks(int nchunk
, int ochunk
,
1183 unsigned int ndata
, unsigned int odata
)
1185 unsigned long a
, b
, blocks
;
1186 /* So how much do we need to backup.
1187 * We need an amount of data which is both a whole number of
1188 * old stripes and a whole number of new stripes.
1189 * So LCM for (chunksize*datadisks).
1191 a
= (ochunk
/512) * odata
;
1192 b
= (nchunk
/512) * ndata
;
1195 /* LCM == product / GCD */
1196 blocks
= (ochunk
/512) * (nchunk
/512) * odata
* ndata
/ a
;
1201 char *analyse_change(char *devname
, struct mdinfo
*info
, struct reshape
*re
)
1203 /* Based on the current array state in info->array and
1204 * the changes in info->new_* etc, determine:
1205 * - whether the change is possible
1206 * - Intermediate level/raid_disks/layout
1207 * - whether a restriping reshape is needed
1208 * - number of sectors in minimum change unit. This
1209 * will cover a whole number of stripes in 'before' and
1212 * Return message if the change should be rejected
1213 * NULL if the change can be achieved
1215 * This can be called as part of starting a reshape, or
1216 * when assembling an array that is undergoing reshape.
1218 int near
, far
, offset
, copies
;
1220 int old_chunk
, new_chunk
;
1221 /* delta_parity records change in number of devices
1222 * caused by level change
1224 int delta_parity
= 0;
1226 memset(re
, 0, sizeof(*re
));
1228 /* If a new level not explicitly given, we assume no-change */
1229 if (info
->new_level
== UnSet
)
1230 info
->new_level
= info
->array
.level
;
1232 if (info
->new_chunk
)
1233 switch (info
->new_level
) {
1239 /* chunk size is meaningful, must divide component_size
1242 if (info
->component_size
% (info
->new_chunk
/512)) {
1243 unsigned long long shrink
= info
->component_size
;
1244 shrink
&= ~(unsigned long long)(info
->new_chunk
/512-1);
1245 pr_err("New chunk size (%dK) does not evenly divide device size (%lluk)\n",
1246 info
->new_chunk
/1024, info
->component_size
/2);
1247 pr_err("After shrinking any filesystem, \"mdadm --grow %s --size %llu\"\n",
1249 pr_err("will shrink the array so the given chunk size would work.\n");
1254 return "chunk size not meaningful for this level";
1257 info
->new_chunk
= info
->array
.chunk_size
;
1259 switch (info
->array
.level
) {
1261 return "No reshape is possibly for this RAID level";
1263 if (info
->delta_disks
!= UnSet
)
1264 return "Only --add is supported for LINEAR, setting --raid-disks is not needed";
1266 return "Only --add is supported for LINEAR, other --grow options are not meaningful";
1268 /* RAID1 can convert to RAID1 with different disks, or
1269 * raid5 with 2 disks, or
1272 if (info
->new_level
> 1 && (info
->component_size
& 7))
1273 return "Cannot convert RAID1 of this size - reduce size to multiple of 4K first.";
1274 if (info
->new_level
== 0) {
1275 if (info
->delta_disks
!= UnSet
&&
1276 info
->delta_disks
!= 0)
1277 return "Cannot change number of disks with RAID1->RAID0 conversion";
1279 re
->before
.data_disks
= 1;
1280 re
->after
.data_disks
= 1;
1283 if (info
->new_level
== 1) {
1284 if (info
->delta_disks
== UnSet
)
1285 /* Don't know what to do */
1286 return "no change requested for Growing RAID1";
1290 if (info
->array
.raid_disks
!= 2 && info
->new_level
== 5)
1291 return "Can only convert a 2-device array to RAID5";
1292 if (info
->array
.raid_disks
== 2 && info
->new_level
== 5) {
1294 re
->before
.data_disks
= 1;
1295 if (info
->delta_disks
!= UnSet
&&
1296 info
->delta_disks
!= 0)
1297 re
->after
.data_disks
= 1 + info
->delta_disks
;
1299 re
->after
.data_disks
= 1;
1300 if (re
->after
.data_disks
< 1)
1301 return "Number of disks too small for RAID5";
1303 re
->before
.layout
= ALGORITHM_LEFT_SYMMETRIC
;
1304 info
->array
.chunk_size
= 65536;
1307 /* Could do some multi-stage conversions, but leave that to
1310 return "Impossibly level change request for RAID1";
1313 /* RAID10 can be converted from near mode to
1314 * RAID0 by removing some devices.
1315 * It can also be reshaped if the kernel supports
1318 switch (info
->new_level
) {
1320 if ((info
->array
.layout
& ~0xff) != 0x100)
1321 return "Cannot Grow RAID10 with far/offset layout";
1322 /* number of devices must be multiple of number of copies */
1323 if (info
->array
.raid_disks
% (info
->array
.layout
& 0xff))
1324 return "RAID10 layout too complex for Grow operation";
1326 new_disks
= (info
->array
.raid_disks
1327 / (info
->array
.layout
& 0xff));
1328 if (info
->delta_disks
== UnSet
)
1329 info
->delta_disks
= (new_disks
1330 - info
->array
.raid_disks
);
1332 if (info
->delta_disks
!= new_disks
- info
->array
.raid_disks
)
1333 return "New number of raid-devices impossible for RAID10";
1334 if (info
->new_chunk
&&
1335 info
->new_chunk
!= info
->array
.chunk_size
)
1336 return "Cannot change chunk-size with RAID10 Grow";
1340 re
->before
.data_disks
= new_disks
;
1341 re
->after
.data_disks
= re
->before
.data_disks
;
1345 near
= info
->array
.layout
& 0xff;
1346 far
= (info
->array
.layout
>> 8) & 0xff;
1347 offset
= info
->array
.layout
& 0x10000;
1348 if (far
> 1 && !offset
)
1349 return "Cannot reshape RAID10 in far-mode";
1350 copies
= near
* far
;
1352 old_chunk
= info
->array
.chunk_size
* far
;
1354 if (info
->new_layout
== UnSet
)
1355 info
->new_layout
= info
->array
.layout
;
1357 near
= info
->new_layout
& 0xff;
1358 far
= (info
->new_layout
>> 8) & 0xff;
1359 offset
= info
->new_layout
& 0x10000;
1360 if (far
> 1 && !offset
)
1361 return "Cannot reshape RAID10 to far-mode";
1362 if (near
* far
!= copies
)
1363 return "Cannot change number of copies when reshaping RAID10";
1365 if (info
->delta_disks
== UnSet
)
1366 info
->delta_disks
= 0;
1367 new_disks
= (info
->array
.raid_disks
+
1370 new_chunk
= info
->new_chunk
* far
;
1373 re
->before
.layout
= info
->array
.layout
;
1374 re
->before
.data_disks
= info
->array
.raid_disks
;
1375 re
->after
.layout
= info
->new_layout
;
1376 re
->after
.data_disks
= new_disks
;
1377 /* For RAID10 we don't do backup but do allow reshape,
1378 * so set backup_blocks to INVALID_SECTORS rather than
1380 * And there is no need to synchronise stripes on both
1381 * 'old' and 'new'. So the important
1382 * number is the minimum data_offset difference
1383 * which is the larger of (offset copies * chunk).
1385 re
->backup_blocks
= INVALID_SECTORS
;
1386 re
->min_offset_change
= max(old_chunk
, new_chunk
) / 512;
1387 if (new_disks
< re
->before
.data_disks
&&
1388 info
->space_after
< re
->min_offset_change
)
1389 /* Reduce component size by one chunk */
1390 re
->new_size
= (info
->component_size
-
1391 re
->min_offset_change
);
1393 re
->new_size
= info
->component_size
;
1394 re
->new_size
= re
->new_size
* new_disks
/ copies
;
1398 return "RAID10 can only be changed to RAID0";
1401 /* RAID0 can be converted to RAID10, or to RAID456 */
1402 if (info
->new_level
== 10) {
1403 if (info
->new_layout
== UnSet
&&
1404 info
->delta_disks
== UnSet
) {
1405 /* Assume near=2 layout */
1406 info
->new_layout
= 0x102;
1407 info
->delta_disks
= info
->array
.raid_disks
;
1409 if (info
->new_layout
== UnSet
) {
1410 int copies
= 1 + (info
->delta_disks
1411 / info
->array
.raid_disks
);
1412 if (info
->array
.raid_disks
* (copies
-1)
1413 != info
->delta_disks
)
1414 return "Impossible number of devices for RAID0->RAID10";
1415 info
->new_layout
= 0x100 + copies
;
1417 if (info
->delta_disks
== UnSet
) {
1418 int copies
= info
->new_layout
& 0xff;
1419 if (info
->new_layout
!= 0x100 + copies
)
1420 return "New layout impossible for RAID0->RAID10";;
1421 info
->delta_disks
= (copies
- 1) *
1422 info
->array
.raid_disks
;
1424 if (info
->new_chunk
&&
1425 info
->new_chunk
!= info
->array
.chunk_size
)
1426 return "Cannot change chunk-size with RAID0->RAID10";
1429 re
->before
.data_disks
= (info
->array
.raid_disks
+
1431 re
->after
.data_disks
= re
->before
.data_disks
;
1432 re
->before
.layout
= info
->new_layout
;
1436 /* RAID0 can also covert to RAID0/4/5/6 by first converting to
1437 * a raid4 style layout of the final level.
1439 switch (info
->new_level
) {
1444 re
->before
.layout
= 0;
1449 re
->before
.layout
= ALGORITHM_PARITY_N
;
1450 if (info
->new_layout
== UnSet
)
1451 info
->new_layout
= map_name(r5layout
, "default");
1456 re
->before
.layout
= ALGORITHM_PARITY_N
;
1457 if (info
->new_layout
== UnSet
)
1458 info
->new_layout
= map_name(r6layout
, "default");
1461 return "Impossible level change requested";
1463 re
->before
.data_disks
= info
->array
.raid_disks
;
1464 /* determining 'after' layout happens outside this 'switch' */
1468 info
->array
.layout
= ALGORITHM_PARITY_N
;
1470 switch (info
->new_level
) {
1474 re
->level
= info
->array
.level
;
1475 re
->before
.data_disks
= info
->array
.raid_disks
- 1;
1476 re
->before
.layout
= info
->array
.layout
;
1480 re
->before
.data_disks
= info
->array
.raid_disks
- 1;
1481 re
->before
.layout
= info
->array
.layout
;
1486 re
->before
.data_disks
= info
->array
.raid_disks
- 1;
1487 switch (info
->array
.layout
) {
1488 case ALGORITHM_LEFT_ASYMMETRIC
:
1489 re
->before
.layout
= ALGORITHM_LEFT_ASYMMETRIC_6
;
1491 case ALGORITHM_RIGHT_ASYMMETRIC
:
1492 re
->before
.layout
= ALGORITHM_RIGHT_ASYMMETRIC_6
;
1494 case ALGORITHM_LEFT_SYMMETRIC
:
1495 re
->before
.layout
= ALGORITHM_LEFT_SYMMETRIC_6
;
1497 case ALGORITHM_RIGHT_SYMMETRIC
:
1498 re
->before
.layout
= ALGORITHM_RIGHT_SYMMETRIC_6
;
1500 case ALGORITHM_PARITY_0
:
1501 re
->before
.layout
= ALGORITHM_PARITY_0_6
;
1503 case ALGORITHM_PARITY_N
:
1504 re
->before
.layout
= ALGORITHM_PARITY_N_6
;
1507 return "Cannot convert an array with this layout";
1511 if (info
->array
.raid_disks
!= 2)
1512 return "Can only convert a 2-device array to RAID1";
1513 if (info
->delta_disks
!= UnSet
&&
1514 info
->delta_disks
!= 0)
1515 return "Cannot set raid_disk when converting RAID5->RAID1";
1517 info
->new_chunk
= 0;
1520 return "Impossible level change requested";
1524 switch (info
->new_level
) {
1530 re
->before
.data_disks
= info
->array
.raid_disks
- 2;
1531 re
->before
.layout
= info
->array
.layout
;
1534 return "Impossible level change requested";
1539 /* If we reached here then it looks like a re-stripe is
1540 * happening. We have determined the intermediate level
1541 * and initial raid_disks/layout and stored these in 're'.
1543 * We need to deduce the final layout that can be atomically
1544 * converted to the end state.
1546 switch (info
->new_level
) {
1548 /* We can only get to RAID0 from RAID4 or RAID5
1549 * with appropriate layout and one extra device
1551 if (re
->level
!= 4 && re
->level
!= 5)
1552 return "Cannot covert to RAID0 from this level";
1554 switch (re
->level
) {
1556 re
->before
.layout
= 0;
1557 re
->after
.layout
= 0;
1560 re
->after
.layout
= ALGORITHM_PARITY_N
;
1566 /* We can only get to RAID4 from RAID5 */
1567 if (re
->level
!= 4 && re
->level
!= 5)
1568 return "Cannot convert to RAID4 from this level";
1570 switch (re
->level
) {
1572 re
->after
.layout
= 0;
1575 re
->after
.layout
= ALGORITHM_PARITY_N
;
1581 /* We get to RAID5 from RAID5 or RAID6 */
1582 if (re
->level
!= 5 && re
->level
!= 6)
1583 return "Cannot convert to RAID5 from this level";
1585 switch (re
->level
) {
1587 if (info
->new_layout
== UnSet
)
1588 re
->after
.layout
= re
->before
.layout
;
1590 re
->after
.layout
= info
->new_layout
;
1593 if (info
->new_layout
== UnSet
)
1594 info
->new_layout
= re
->before
.layout
;
1596 /* after.layout needs to be raid6 version of new_layout */
1597 if (info
->new_layout
== ALGORITHM_PARITY_N
)
1598 re
->after
.layout
= ALGORITHM_PARITY_N
;
1601 char *ls
= map_num(r5layout
, info
->new_layout
);
1604 /* Current RAID6 layout has a RAID5
1607 strcat(strcpy(layout
, ls
), "-6");
1608 l
= map_name(r6layout
, layout
);
1610 return "Cannot find RAID6 layout to convert to";
1612 /* Current RAID6 has no equivalent.
1613 * If it is already a '-6' layout we
1614 * can leave it unchanged, else we must
1617 ls
= map_num(r6layout
, info
->new_layout
);
1619 strcmp(ls
+strlen(ls
)-2, "-6") != 0)
1620 return "Please specify new layout";
1621 l
= info
->new_layout
;
1623 re
->after
.layout
= l
;
1629 /* We must already be at level 6 */
1631 return "Impossible level change";
1632 if (info
->new_layout
== UnSet
)
1633 re
->after
.layout
= info
->array
.layout
;
1635 re
->after
.layout
= info
->new_layout
;
1638 return "Impossible level change requested";
1640 if (info
->delta_disks
== UnSet
)
1641 info
->delta_disks
= delta_parity
;
1643 re
->after
.data_disks
=
1644 (re
->before
.data_disks
+ info
->delta_disks
- delta_parity
);
1646 switch (re
->level
) {
1658 /* So we have a restripe operation, we need to calculate the number
1659 * of blocks per reshape operation.
1661 re
->new_size
= info
->component_size
* re
->before
.data_disks
;
1662 if (info
->new_chunk
== 0)
1663 info
->new_chunk
= info
->array
.chunk_size
;
1664 if (re
->after
.data_disks
== re
->before
.data_disks
&&
1665 re
->after
.layout
== re
->before
.layout
&&
1666 info
->new_chunk
== info
->array
.chunk_size
) {
1667 /* Nothing to change, can change level immediately. */
1668 re
->level
= info
->new_level
;
1669 re
->backup_blocks
= 0;
1672 if (re
->after
.data_disks
== 1 && re
->before
.data_disks
== 1) {
1673 /* chunk and layout changes make no difference */
1674 re
->level
= info
->new_level
;
1675 re
->backup_blocks
= 0;
1679 if (re
->after
.data_disks
== re
->before
.data_disks
&&
1680 get_linux_version() < 2006032)
1681 return "in-place reshape is not safe before 2.6.32 - sorry.";
1683 if (re
->after
.data_disks
< re
->before
.data_disks
&&
1684 get_linux_version() < 2006030)
1685 return "reshape to fewer devices is not supported before 2.6.30 - sorry.";
1687 re
->backup_blocks
= compute_backup_blocks(
1688 info
->new_chunk
, info
->array
.chunk_size
,
1689 re
->after
.data_disks
,
1690 re
->before
.data_disks
);
1691 re
->min_offset_change
= re
->backup_blocks
/ re
->before
.data_disks
;
1693 re
->new_size
= info
->component_size
* re
->after
.data_disks
;
1697 static int set_array_size(struct supertype
*st
, struct mdinfo
*sra
,
1700 struct mdinfo
*info
;
1704 if ((st
== NULL
) || (sra
== NULL
))
1707 if (text_version
== NULL
)
1708 text_version
= sra
->text_version
;
1709 subarray
= strchr(text_version
+ 1, '/')+1;
1710 info
= st
->ss
->container_content(st
, subarray
);
1712 unsigned long long current_size
= 0;
1713 unsigned long long new_size
=
1714 info
->custom_array_size
/2;
1716 if (sysfs_get_ll(sra
, NULL
, "array_size", ¤t_size
) == 0 &&
1717 new_size
> current_size
) {
1718 if (sysfs_set_num(sra
, NULL
, "array_size", new_size
)
1720 dprintf("Error: Cannot set array size");
1723 dprintf("Array size changed");
1725 dprintf_cont(" from %llu to %llu.\n",
1726 current_size
, new_size
);
1730 dprintf("Error: set_array_size(): info pointer in NULL\n");
1735 static int reshape_array(char *container
, int fd
, char *devname
,
1736 struct supertype
*st
, struct mdinfo
*info
,
1737 int force
, struct mddev_dev
*devlist
,
1738 unsigned long long data_offset
,
1739 char *backup_file
, int verbose
, int forked
,
1740 int restart
, int freeze_reshape
);
1741 static int reshape_container(char *container
, char *devname
,
1743 struct supertype
*st
,
1744 struct mdinfo
*info
,
1746 char *backup_file
, int verbose
,
1747 int forked
, int restart
, int freeze_reshape
);
1749 int Grow_reshape(char *devname
, int fd
,
1750 struct mddev_dev
*devlist
,
1751 unsigned long long data_offset
,
1752 struct context
*c
, struct shape
*s
)
1754 /* Make some changes in the shape of an array.
1755 * The kernel must support the change.
1757 * There are three different changes. Each can trigger
1758 * a resync or recovery so we freeze that until we have
1759 * requested everything (if kernel supports freezing - 2.6.30).
1761 * - change size (i.e. component_size)
1763 * - change layout/chunksize/ndisks
1765 * The last can require a reshape. It is different on different
1766 * levels so we need to check the level before actioning it.
1767 * Some times the level change needs to be requested after the
1768 * reshape (e.g. raid6->raid5, raid5->raid0)
1771 struct mdu_array_info_s array
;
1773 struct supertype
*st
;
1774 char *subarray
= NULL
;
1778 char *container
= NULL
;
1781 struct mddev_dev
*dv
;
1787 if (md_get_array_info(fd
, &array
) < 0) {
1788 pr_err("%s is not an active md array - aborting\n",
1792 if (data_offset
!= INVALID_SECTORS
&& array
.level
!= 10 &&
1793 (array
.level
< 4 || array
.level
> 6)) {
1794 pr_err("--grow --data-offset not yet supported\n");
1799 (s
->chunk
|| s
->level
!= UnSet
|| s
->layout_str
|| s
->raiddisks
)) {
1800 pr_err("cannot change component size at the same time as other changes.\n"
1801 " Change size first, then check data is intact before making other changes.\n");
1805 if (s
->raiddisks
&& s
->raiddisks
< array
.raid_disks
&&
1806 array
.level
> 1 && get_linux_version() < 2006032 &&
1807 !check_env("MDADM_FORCE_FEWER")) {
1808 pr_err("reducing the number of devices is not safe before Linux 2.6.32\n"
1809 " Please use a newer kernel\n");
1813 st
= super_by_fd(fd
, &subarray
);
1815 pr_err("Unable to determine metadata format for %s\n", devname
);
1818 if (s
->raiddisks
> st
->max_devs
) {
1819 pr_err("Cannot increase raid-disks on this array beyond %d\n", st
->max_devs
);
1822 if (s
->level
== 0 &&
1823 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)) &&
1824 !(array
.state
& (1<<MD_SB_CLUSTERED
))) {
1825 array
.state
&= ~(1<<MD_SB_BITMAP_PRESENT
);
1826 if (ioctl(fd
, SET_ARRAY_INFO
, &array
)!= 0) {
1827 pr_err("failed to remove internal bitmap.\n");
1832 /* in the external case we need to check that the requested reshape is
1833 * supported, and perform an initial check that the container holds the
1834 * pre-requisite spare devices (mdmon owns final validation)
1836 if (st
->ss
->external
) {
1840 container
= st
->container_devnm
;
1841 cfd
= open_dev_excl(st
->container_devnm
);
1843 container
= st
->devnm
;
1845 cfd
= open_dev_excl(st
->devnm
);
1849 pr_err("Unable to open container for %s\n",
1855 rv
= st
->ss
->load_container(st
, cfd
, NULL
);
1858 pr_err("Cannot read superblock for %s\n",
1864 /* check if operation is supported for metadata handler */
1865 if (st
->ss
->container_content
) {
1866 struct mdinfo
*cc
= NULL
;
1867 struct mdinfo
*content
= NULL
;
1869 cc
= st
->ss
->container_content(st
, subarray
);
1870 for (content
= cc
; content
; content
= content
->next
) {
1871 int allow_reshape
= 1;
1873 /* check if reshape is allowed based on metadata
1874 * indications stored in content.array.status
1876 if (content
->array
.state
&
1877 (1 << MD_SB_BLOCK_VOLUME
))
1879 if (content
->array
.state
&
1880 (1 << MD_SB_BLOCK_CONTAINER_RESHAPE
))
1882 if (!allow_reshape
) {
1883 pr_err("cannot reshape arrays in container with unsupported metadata: %s(%s)\n",
1884 devname
, container
);
1892 if (mdmon_running(container
))
1893 st
->update_tail
= &st
->updates
;
1897 for (dv
= devlist
; dv
; dv
= dv
->next
)
1899 if (s
->raiddisks
> array
.raid_disks
&&
1900 array
.spare_disks
+ added_disks
< (s
->raiddisks
- array
.raid_disks
) &&
1902 pr_err("Need %d spare%s to avoid degraded array, and only have %d.\n"
1903 " Use --force to over-ride this check.\n",
1904 s
->raiddisks
- array
.raid_disks
,
1905 s
->raiddisks
- array
.raid_disks
== 1 ? "" : "s",
1906 array
.spare_disks
+ added_disks
);
1910 sra
= sysfs_read(fd
, NULL
, GET_LEVEL
| GET_DISKS
| GET_DEVS
|
1911 GET_STATE
| GET_VERSION
);
1913 if (st
->ss
->external
&& subarray
== NULL
) {
1914 array
.level
= LEVEL_CONTAINER
;
1915 sra
->array
.level
= LEVEL_CONTAINER
;
1918 pr_err("failed to read sysfs parameters for %s\n",
1922 frozen
= freeze(st
);
1924 /* freeze() already spewed the reason */
1927 } else if (frozen
< 0) {
1928 pr_err("%s is performing resync/recovery and cannot be reshaped\n", devname
);
1933 /* ========= set size =============== */
1935 (s
->size
== MAX_SIZE
|| s
->size
!= (unsigned)array
.size
)) {
1936 unsigned long long orig_size
= get_component_size(fd
)/2;
1937 unsigned long long min_csize
;
1939 int raid0_takeover
= 0;
1942 orig_size
= (unsigned) array
.size
;
1944 if (orig_size
== 0) {
1945 pr_err("Cannot set device size in this type of array.\n");
1950 if (reshape_super(st
, s
->size
, UnSet
, UnSet
, 0, 0, UnSet
, NULL
,
1951 devname
, APPLY_METADATA_CHANGES
,
1957 if (st
->ss
->external
) {
1958 /* metadata can have size limitation
1959 * update size value according to metadata information
1961 struct mdinfo
*sizeinfo
=
1962 st
->ss
->container_content(st
, subarray
);
1964 unsigned long long new_size
=
1965 sizeinfo
->custom_array_size
/2;
1966 int data_disks
= get_data_disks(
1967 sizeinfo
->array
.level
,
1968 sizeinfo
->array
.layout
,
1969 sizeinfo
->array
.raid_disks
);
1970 new_size
/= data_disks
;
1971 dprintf("Metadata size correction from %llu to %llu (%llu)\n",
1972 orig_size
, new_size
,
1973 new_size
* data_disks
);
1975 sysfs_free(sizeinfo
);
1979 /* Update the size of each member device in case
1980 * they have been resized. This will never reduce
1981 * below the current used-size. The "size" attribute
1982 * understands '0' to mean 'max'.
1986 for (mdi
= sra
->devs
; mdi
; mdi
= mdi
->next
) {
1987 if (sysfs_set_num(sra
, mdi
, "size",
1988 s
->size
== MAX_SIZE
? 0 : s
->size
) < 0) {
1989 /* Probably kernel refusing to let us
1990 * reduce the size - not an error.
1994 if (array
.not_persistent
== 0 &&
1995 array
.major_version
== 0 &&
1996 get_linux_version() < 3001000) {
1997 /* Dangerous to allow size to exceed 2TB */
1998 unsigned long long csize
;
1999 if (sysfs_get_ll(sra
, mdi
, "size", &csize
) == 0) {
2000 if (csize
>= 2ULL*1024*1024*1024)
2001 csize
= 2ULL*1024*1024*1024;
2002 if ((min_csize
== 0 || (min_csize
2009 pr_err("Cannot set size on array members.\n");
2010 goto size_change_error
;
2012 if (min_csize
&& s
->size
> min_csize
) {
2013 pr_err("Cannot safely make this array use more than 2TB per device on this kernel.\n");
2015 goto size_change_error
;
2017 if (min_csize
&& s
->size
== MAX_SIZE
) {
2018 /* Don't let the kernel choose a size - it will get
2021 pr_err("Limited v0.90 array to 2TB per device\n");
2022 s
->size
= min_csize
;
2024 if (st
->ss
->external
) {
2025 if (sra
->array
.level
== 0) {
2026 rv
= sysfs_set_str(sra
, NULL
, "level",
2030 /* get array parameters after takeover
2031 * to change one parameter at time only
2033 rv
= md_get_array_info(fd
, &array
);
2036 /* make sure mdmon is
2037 * aware of the new level */
2038 if (!mdmon_running(st
->container_devnm
))
2039 start_mdmon(st
->container_devnm
);
2040 ping_monitor(container
);
2041 if (mdmon_running(st
->container_devnm
) &&
2042 st
->update_tail
== NULL
)
2043 st
->update_tail
= &st
->updates
;
2046 if (s
->size
== MAX_SIZE
)
2048 array
.size
= s
->size
;
2049 if (s
->size
& ~INT32_MAX
) {
2050 /* got truncated to 32bit, write to
2051 * component_size instead
2054 rv
= sysfs_set_num(sra
, NULL
,
2055 "component_size", s
->size
);
2059 rv
= ioctl(fd
, SET_ARRAY_INFO
, &array
);
2061 /* manage array size when it is managed externally
2063 if ((rv
== 0) && st
->ss
->external
)
2064 rv
= set_array_size(st
, sra
, sra
->text_version
);
2067 if (raid0_takeover
) {
2068 /* do not recync non-existing parity,
2069 * we will drop it anyway
2071 sysfs_set_str(sra
, NULL
, "sync_action", "frozen");
2072 /* go back to raid0, drop parity disk
2074 sysfs_set_str(sra
, NULL
, "level", "raid0");
2075 md_get_array_info(fd
, &array
);
2082 /* restore metadata */
2083 if (reshape_super(st
, orig_size
, UnSet
, UnSet
, 0, 0,
2084 UnSet
, NULL
, devname
,
2085 ROLLBACK_METADATA_CHANGES
,
2088 pr_err("Cannot set device size for %s: %s\n",
2089 devname
, strerror(err
));
2091 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2092 cont_err("Bitmap must be removed before size can be changed\n");
2096 if (s
->assume_clean
) {
2097 /* This will fail on kernels older than 3.0 unless
2098 * a backport has been arranged.
2101 sysfs_set_str(sra
, NULL
, "resync_start", "none") < 0)
2102 pr_err("--assume-clean not supported with --grow on this kernel\n");
2104 md_get_array_info(fd
, &array
);
2105 s
->size
= get_component_size(fd
)/2;
2107 s
->size
= array
.size
;
2108 if (c
->verbose
>= 0) {
2109 if (s
->size
== orig_size
)
2110 pr_err("component size of %s unchanged at %lluK\n",
2113 pr_err("component size of %s has been set to %lluK\n",
2117 } else if (array
.level
!= LEVEL_CONTAINER
) {
2118 s
->size
= get_component_size(fd
)/2;
2120 s
->size
= array
.size
;
2123 /* See if there is anything else to do */
2124 if ((s
->level
== UnSet
|| s
->level
== array
.level
) &&
2125 (s
->layout_str
== NULL
) &&
2126 (s
->chunk
== 0 || s
->chunk
== array
.chunk_size
) &&
2127 data_offset
== INVALID_SECTORS
&&
2128 (s
->raiddisks
== 0 || s
->raiddisks
== array
.raid_disks
)) {
2129 /* Nothing more to do */
2130 if (!changed
&& c
->verbose
>= 0)
2131 pr_err("%s: no change requested\n",
2136 /* ========= check for Raid10/Raid1 -> Raid0 conversion ===============
2137 * current implementation assumes that following conditions must be met:
2140 * - near_copies == 2
2142 if ((s
->level
== 0 && array
.level
== 10 && sra
&&
2143 array
.layout
== ((1 << 8) + 2) && !(array
.raid_disks
& 1)) ||
2144 (s
->level
== 0 && array
.level
== 1 && sra
)) {
2146 err
= remove_disks_for_takeover(st
, sra
, array
.layout
);
2148 dprintf("Array cannot be reshaped\n");
2154 /* Make sure mdmon has seen the device removal
2155 * and updated metadata before we continue with
2159 ping_monitor(container
);
2162 memset(&info
, 0, sizeof(info
));
2164 sysfs_init(&info
, fd
, NULL
);
2165 strcpy(info
.text_version
, sra
->text_version
);
2166 info
.component_size
= s
->size
*2;
2167 info
.new_level
= s
->level
;
2168 info
.new_chunk
= s
->chunk
* 1024;
2169 if (info
.array
.level
== LEVEL_CONTAINER
) {
2170 info
.delta_disks
= UnSet
;
2171 info
.array
.raid_disks
= s
->raiddisks
;
2172 } else if (s
->raiddisks
)
2173 info
.delta_disks
= s
->raiddisks
- info
.array
.raid_disks
;
2175 info
.delta_disks
= UnSet
;
2176 if (s
->layout_str
== NULL
) {
2177 info
.new_layout
= UnSet
;
2178 if (info
.array
.level
== 6 &&
2179 (info
.new_level
== 6 || info
.new_level
== UnSet
) &&
2180 info
.array
.layout
>= 16) {
2181 pr_err("%s has a non-standard layout. If you wish to preserve this\n", devname
);
2182 cont_err("during the reshape, please specify --layout=preserve\n");
2183 cont_err("If you want to change it, specify a layout or use --layout=normalise\n");
2187 } else if (strcmp(s
->layout_str
, "normalise") == 0 ||
2188 strcmp(s
->layout_str
, "normalize") == 0) {
2189 /* If we have a -6 RAID6 layout, remove the '-6'. */
2190 info
.new_layout
= UnSet
;
2191 if (info
.array
.level
== 6 && info
.new_level
== UnSet
) {
2193 strcpy(l
, map_num(r6layout
, info
.array
.layout
));
2194 h
= strrchr(l
, '-');
2195 if (h
&& strcmp(h
, "-6") == 0) {
2197 info
.new_layout
= map_name(r6layout
, l
);
2200 pr_err("%s is only meaningful when reshaping a RAID6 array.\n", s
->layout_str
);
2204 } else if (strcmp(s
->layout_str
, "preserve") == 0) {
2205 /* This means that a non-standard RAID6 layout
2208 * - When reshape a RAID6 (e.g. adding a device)
2209 * which is in a non-standard layout, it is OK
2210 * to preserve that layout.
2211 * - When converting a RAID5 to RAID6, leave it in
2212 * the XXX-6 layout, don't re-layout.
2214 if (info
.array
.level
== 6 && info
.new_level
== UnSet
)
2215 info
.new_layout
= info
.array
.layout
;
2216 else if (info
.array
.level
== 5 && info
.new_level
== 6) {
2218 strcpy(l
, map_num(r5layout
, info
.array
.layout
));
2220 info
.new_layout
= map_name(r6layout
, l
);
2222 pr_err("%s in only meaningful when reshaping to RAID6\n", s
->layout_str
);
2227 int l
= info
.new_level
;
2229 l
= info
.array
.level
;
2232 info
.new_layout
= map_name(r5layout
, s
->layout_str
);
2235 info
.new_layout
= map_name(r6layout
, s
->layout_str
);
2238 info
.new_layout
= parse_layout_10(s
->layout_str
);
2241 info
.new_layout
= parse_layout_faulty(s
->layout_str
);
2244 pr_err("layout not meaningful with this level\n");
2248 if (info
.new_layout
== UnSet
) {
2249 pr_err("layout %s not understood for this level\n",
2256 if (array
.level
== LEVEL_FAULTY
) {
2257 if (s
->level
!= UnSet
&& s
->level
!= array
.level
) {
2258 pr_err("cannot change level of Faulty device\n");
2262 pr_err("cannot set chunksize of Faulty device\n");
2265 if (s
->raiddisks
&& s
->raiddisks
!= 1) {
2266 pr_err("cannot set raid_disks of Faulty device\n");
2269 if (s
->layout_str
) {
2270 if (md_get_array_info(fd
, &array
) != 0) {
2271 dprintf("Cannot get array information.\n");
2274 array
.layout
= info
.new_layout
;
2275 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
2276 pr_err("failed to set new layout\n");
2278 } else if (c
->verbose
>= 0)
2279 printf("layout for %s set to %d\n",
2280 devname
, array
.layout
);
2282 } else if (array
.level
== LEVEL_CONTAINER
) {
2283 /* This change is to be applied to every array in the
2284 * container. This is only needed when the metadata imposes
2285 * restraints of the various arrays in the container.
2286 * Currently we only know that IMSM requires all arrays
2287 * to have the same number of devices so changing the
2288 * number of devices (On-Line Capacity Expansion) must be
2289 * performed at the level of the container
2295 rv
= reshape_container(container
, devname
, -1, st
, &info
,
2296 c
->force
, c
->backup_file
, c
->verbose
, 0, 0, 0);
2299 /* get spare devices from external metadata
2301 if (st
->ss
->external
) {
2302 struct mdinfo
*info2
;
2304 info2
= st
->ss
->container_content(st
, subarray
);
2306 info
.array
.spare_disks
=
2307 info2
->array
.spare_disks
;
2312 /* Impose these changes on a single array. First
2313 * check that the metadata is OK with the change. */
2315 if (reshape_super(st
, 0, info
.new_level
,
2316 info
.new_layout
, info
.new_chunk
,
2317 info
.array
.raid_disks
, info
.delta_disks
,
2318 c
->backup_file
, devname
, APPLY_METADATA_CHANGES
,
2324 rv
= reshape_array(container
, fd
, devname
, st
, &info
, c
->force
,
2325 devlist
, data_offset
, c
->backup_file
, c
->verbose
,
2336 /* verify_reshape_position()
2337 * Function checks if reshape position in metadata is not farther
2338 * than position in md.
2340 * 0 : not valid sysfs entry
2341 * it can be caused by not started reshape, it should be started
2342 * by reshape array or raid0 array is before takeover
2343 * -1 : error, reshape position is obviously wrong
2344 * 1 : success, reshape progress correct or updated
2346 static int verify_reshape_position(struct mdinfo
*info
, int level
)
2352 /* read sync_max, failure can mean raid0 array */
2353 rv
= sysfs_get_str(info
, NULL
, "sync_max", buf
, 40);
2357 unsigned long long position
= strtoull(buf
, &ep
, 0);
2359 dprintf("Read sync_max sysfs entry is: %s\n", buf
);
2360 if (!(ep
== buf
|| (*ep
!= 0 && *ep
!= '\n' && *ep
!= ' '))) {
2361 position
*= get_data_disks(level
,
2363 info
->array
.raid_disks
);
2364 if (info
->reshape_progress
< position
) {
2365 dprintf("Corrected reshape progress (%llu) to md position (%llu)\n",
2366 info
->reshape_progress
, position
);
2367 info
->reshape_progress
= position
;
2369 } else if (info
->reshape_progress
> position
) {
2370 pr_err("Fatal error: array reshape was not properly frozen (expected reshape position is %llu, but reshape progress is %llu.\n",
2371 position
, info
->reshape_progress
);
2374 dprintf("Reshape position in md and metadata are the same;");
2378 } else if (rv
== 0) {
2379 /* for valid sysfs entry, 0-length content
2380 * should be indicated as error
2388 static unsigned long long choose_offset(unsigned long long lo
,
2389 unsigned long long hi
,
2390 unsigned long long min
,
2391 unsigned long long max
)
2393 /* Choose a new offset between hi and lo.
2394 * It must be between min and max, but
2395 * we would prefer something near the middle of hi/lo, and also
2396 * prefer to be aligned to a big power of 2.
2398 * So we start with the middle, then for each bit,
2399 * starting at '1' and increasing, if it is set, we either
2400 * add it or subtract it if possible, preferring the option
2401 * which is furthest from the boundary.
2403 * We stop once we get a 1MB alignment. As units are in sectors,
2404 * 1MB = 2*1024 sectors.
2406 unsigned long long choice
= (lo
+ hi
) / 2;
2407 unsigned long long bit
= 1;
2409 for (bit
= 1; bit
< 2*1024; bit
= bit
<< 1) {
2410 unsigned long long bigger
, smaller
;
2411 if (! (bit
& choice
))
2413 bigger
= choice
+ bit
;
2414 smaller
= choice
- bit
;
2415 if (bigger
> max
&& smaller
< min
)
2419 else if (smaller
< min
)
2421 else if (hi
- bigger
> smaller
- lo
)
2429 static int set_new_data_offset(struct mdinfo
*sra
, struct supertype
*st
,
2430 char *devname
, int delta_disks
,
2431 unsigned long long data_offset
,
2432 unsigned long long min
,
2438 unsigned long long before
, after
;
2440 /* Need to find min space before and after so same is used
2443 before
= UINT64_MAX
;
2445 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
2449 struct supertype
*st2
;
2450 struct mdinfo info2
;
2452 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
2454 dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 0);
2455 dfd
= dev_open(dn
, O_RDONLY
);
2457 pr_err("%s: cannot open component %s\n",
2458 devname
, dn
? dn
: "-unknown-");
2461 st2
= dup_super(st
);
2462 rv
= st2
->ss
->load_super(st2
,dfd
, NULL
);
2466 pr_err("%s: cannot get superblock from %s\n",
2470 st2
->ss
->getinfo_super(st2
, &info2
, NULL
);
2471 st2
->ss
->free_super(st2
);
2473 if (info2
.space_before
== 0 &&
2474 info2
.space_after
== 0) {
2475 /* Metadata doesn't support data_offset changes */
2477 pr_err("%s: Metadata version doesn't support data_offset changes\n",
2481 if (before
> info2
.space_before
)
2482 before
= info2
.space_before
;
2483 if (after
> info2
.space_after
)
2484 after
= info2
.space_after
;
2486 if (data_offset
!= INVALID_SECTORS
) {
2488 if (info2
.data_offset
== data_offset
) {
2489 pr_err("%s: already has that data_offset\n",
2493 if (data_offset
< info2
.data_offset
)
2497 } else if ((data_offset
<= info2
.data_offset
&& dir
== 1) ||
2498 (data_offset
>= info2
.data_offset
&& dir
== -1)) {
2499 pr_err("%s: differing data offsets on devices make this --data-offset setting impossible\n",
2505 if (before
== UINT64_MAX
)
2506 /* impossible really, there must be no devices */
2509 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
2510 char *dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 0);
2511 unsigned long long new_data_offset
;
2513 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
2515 if (delta_disks
< 0) {
2516 /* Don't need any space as array is shrinking
2517 * just move data_offset up by min
2519 if (data_offset
== INVALID_SECTORS
)
2520 new_data_offset
= sd
->data_offset
+ min
;
2522 if (data_offset
< sd
->data_offset
+ min
) {
2523 pr_err("--data-offset too small for %s\n",
2527 new_data_offset
= data_offset
;
2529 } else if (delta_disks
> 0) {
2530 /* need space before */
2534 pr_err("Insufficient head-space for reshape on %s\n",
2538 if (data_offset
== INVALID_SECTORS
)
2539 new_data_offset
= sd
->data_offset
- min
;
2541 if (data_offset
> sd
->data_offset
- min
) {
2542 pr_err("--data-offset too large for %s\n",
2546 new_data_offset
= data_offset
;
2550 /* can move up or down. If 'data_offset'
2551 * was set we would have already decided,
2552 * so just choose direction with most space.
2559 sysfs_set_str(sra
, NULL
, "reshape_direction",
2560 dir
== 1 ? "backwards" : "forwards");
2562 /* Increase data offset */
2566 pr_err("Insufficient tail-space for reshape on %s\n",
2570 if (data_offset
!= INVALID_SECTORS
&&
2571 data_offset
< sd
->data_offset
+ min
) {
2572 pr_err("--data-offset too small on %s\n",
2576 if (data_offset
!= INVALID_SECTORS
)
2577 new_data_offset
= data_offset
;
2579 new_data_offset
= choose_offset(sd
->data_offset
,
2580 sd
->data_offset
+ after
,
2581 sd
->data_offset
+ min
,
2582 sd
->data_offset
+ after
);
2584 /* Decrease data offset */
2588 pr_err("insufficient head-room on %s\n",
2592 if (data_offset
!= INVALID_SECTORS
&&
2593 data_offset
< sd
->data_offset
- min
) {
2594 pr_err("--data-offset too small on %s\n",
2598 if (data_offset
!= INVALID_SECTORS
)
2599 new_data_offset
= data_offset
;
2601 new_data_offset
= choose_offset(sd
->data_offset
- before
,
2603 sd
->data_offset
- before
,
2604 sd
->data_offset
- min
);
2607 err
= sysfs_set_num(sra
, sd
, "new_offset", new_data_offset
);
2608 if (err
< 0 && errno
== E2BIG
) {
2609 /* try again after increasing data size to max */
2610 err
= sysfs_set_num(sra
, sd
, "size", 0);
2611 if (err
< 0 && errno
== EINVAL
&&
2612 !(sd
->disk
.state
& (1<<MD_DISK_SYNC
))) {
2613 /* some kernels have a bug where you cannot
2614 * use '0' on spare devices. */
2615 sysfs_set_num(sra
, sd
, "size",
2616 (sra
->component_size
+ after
)/2);
2618 err
= sysfs_set_num(sra
, sd
, "new_offset",
2622 if (errno
== E2BIG
&& data_offset
!= INVALID_SECTORS
) {
2623 pr_err("data-offset is too big for %s\n",
2627 if (sd
== sra
->devs
&&
2628 (errno
== ENOENT
|| errno
== E2BIG
))
2629 /* Early kernel, no 'new_offset' file,
2630 * or kernel doesn't like us.
2631 * For RAID5/6 this is not fatal
2634 pr_err("Cannot set new_offset for %s\n",
2643 /* Just use a backup file */
2647 static int raid10_reshape(char *container
, int fd
, char *devname
,
2648 struct supertype
*st
, struct mdinfo
*info
,
2649 struct reshape
*reshape
,
2650 unsigned long long data_offset
,
2651 int force
, int verbose
)
2653 /* Changing raid_disks, layout, chunksize or possibly
2654 * just data_offset for a RAID10.
2655 * We must always change data_offset. We change by at least
2656 * ->min_offset_change which is the largest of the old and new
2658 * If raid_disks is increasing, then data_offset must decrease
2659 * by at least this copy size.
2660 * If raid_disks is unchanged, data_offset must increase or
2661 * decrease by at least min_offset_change but preferably by much more.
2662 * We choose half of the available space.
2663 * If raid_disks is decreasing, data_offset must increase by
2664 * at least min_offset_change. To allow of this, component_size
2665 * must be decreased by the same amount.
2667 * So we calculate the required minimum and direction, possibly
2668 * reduce the component_size, then iterate through the devices
2669 * and set the new_data_offset.
2670 * If that all works, we set chunk_size, layout, raid_disks, and start
2674 unsigned long long min
;
2677 sra
= sysfs_read(fd
, NULL
,
2678 GET_COMPONENT
|GET_DEVS
|GET_OFFSET
|GET_STATE
|GET_CHUNK
2681 pr_err("%s: Cannot get array details from sysfs\n",
2685 min
= reshape
->min_offset_change
;
2687 if (info
->delta_disks
)
2688 sysfs_set_str(sra
, NULL
, "reshape_direction",
2689 info
->delta_disks
< 0 ? "backwards" : "forwards");
2690 if (info
->delta_disks
< 0 &&
2691 info
->space_after
< min
) {
2692 int rv
= sysfs_set_num(sra
, NULL
, "component_size",
2693 (sra
->component_size
-
2696 pr_err("cannot reduce component size\n");
2700 err
= set_new_data_offset(sra
, st
, devname
, info
->delta_disks
, data_offset
,
2703 pr_err("Cannot set new_data_offset: RAID10 reshape not\n");
2704 cont_err("supported on this kernel\n");
2710 if (!err
&& sysfs_set_num(sra
, NULL
, "chunk_size", info
->new_chunk
) < 0)
2712 if (!err
&& sysfs_set_num(sra
, NULL
, "layout", reshape
->after
.layout
) < 0)
2714 if (!err
&& sysfs_set_num(sra
, NULL
, "raid_disks",
2715 info
->array
.raid_disks
+ info
->delta_disks
) < 0)
2717 if (!err
&& sysfs_set_str(sra
, NULL
, "sync_action", "reshape") < 0)
2720 pr_err("Cannot set array shape for %s\n",
2723 (info
->array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2724 cont_err(" Bitmap must be removed before shape can be changed\n");
2734 static void get_space_after(int fd
, struct supertype
*st
, struct mdinfo
*info
)
2736 struct mdinfo
*sra
, *sd
;
2737 /* Initialisation to silence compiler warning */
2738 unsigned long long min_space_before
= 0, min_space_after
= 0;
2741 sra
= sysfs_read(fd
, NULL
, GET_DEVS
);
2744 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
2747 struct supertype
*st2
;
2748 struct mdinfo info2
;
2750 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
2752 dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 0);
2753 dfd
= dev_open(dn
, O_RDONLY
);
2756 st2
= dup_super(st
);
2757 if (st2
->ss
->load_super(st2
,dfd
, NULL
)) {
2763 st2
->ss
->getinfo_super(st2
, &info2
, NULL
);
2764 st2
->ss
->free_super(st2
);
2767 min_space_before
> info2
.space_before
)
2768 min_space_before
= info2
.space_before
;
2770 min_space_after
> info2
.space_after
)
2771 min_space_after
= info2
.space_after
;
2774 if (sd
== NULL
&& !first
) {
2775 info
->space_after
= min_space_after
;
2776 info
->space_before
= min_space_before
;
2781 static void update_cache_size(char *container
, struct mdinfo
*sra
,
2782 struct mdinfo
*info
,
2783 int disks
, unsigned long long blocks
)
2785 /* Check that the internal stripe cache is
2786 * large enough, or it won't work.
2787 * It must hold at least 4 stripes of the larger
2790 unsigned long cache
;
2791 cache
= max(info
->array
.chunk_size
, info
->new_chunk
);
2792 cache
*= 4; /* 4 stripes minimum */
2793 cache
/= 512; /* convert to sectors */
2794 /* make sure there is room for 'blocks' with a bit to spare */
2795 if (cache
< 16 + blocks
/ disks
)
2796 cache
= 16 + blocks
/ disks
;
2797 cache
/= (4096/512); /* Convert from sectors to pages */
2799 if (sra
->cache_size
< cache
)
2800 subarray_set_num(container
, sra
, "stripe_cache_size",
2804 static int impose_reshape(struct mdinfo
*sra
,
2805 struct mdinfo
*info
,
2806 struct supertype
*st
,
2809 char *devname
, char *container
,
2810 struct reshape
*reshape
)
2812 struct mdu_array_info_s array
;
2814 sra
->new_chunk
= info
->new_chunk
;
2817 /* for external metadata checkpoint saved by mdmon can be lost
2818 * or missed /due to e.g. crash/. Check if md is not during
2819 * restart farther than metadata points to.
2820 * If so, this means metadata information is obsolete.
2822 if (st
->ss
->external
)
2823 verify_reshape_position(info
, reshape
->level
);
2824 sra
->reshape_progress
= info
->reshape_progress
;
2826 sra
->reshape_progress
= 0;
2827 if (reshape
->after
.data_disks
< reshape
->before
.data_disks
)
2828 /* start from the end of the new array */
2829 sra
->reshape_progress
= (sra
->component_size
2830 * reshape
->after
.data_disks
);
2833 md_get_array_info(fd
, &array
);
2834 if (info
->array
.chunk_size
== info
->new_chunk
&&
2835 reshape
->before
.layout
== reshape
->after
.layout
&&
2836 st
->ss
->external
== 0) {
2837 /* use SET_ARRAY_INFO but only if reshape hasn't started */
2838 array
.raid_disks
= reshape
->after
.data_disks
+ reshape
->parity
;
2840 ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
2843 pr_err("Cannot set device shape for %s: %s\n",
2844 devname
, strerror(errno
));
2847 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2848 cont_err("Bitmap must be removed before shape can be changed\n");
2852 } else if (!restart
) {
2853 /* set them all just in case some old 'new_*' value
2854 * persists from some earlier problem.
2857 if (sysfs_set_num(sra
, NULL
, "chunk_size", info
->new_chunk
) < 0)
2859 if (!err
&& sysfs_set_num(sra
, NULL
, "layout",
2860 reshape
->after
.layout
) < 0)
2862 if (!err
&& subarray_set_num(container
, sra
, "raid_disks",
2863 reshape
->after
.data_disks
+
2864 reshape
->parity
) < 0)
2867 pr_err("Cannot set device shape for %s\n",
2871 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2872 cont_err("Bitmap must be removed before shape can be changed\n");
2881 static int impose_level(int fd
, int level
, char *devname
, int verbose
)
2884 struct mdu_array_info_s array
;
2886 sysfs_init(&info
, fd
, NULL
);
2888 md_get_array_info(fd
, &array
);
2890 (array
.level
>= 4 && array
.level
<= 6)) {
2891 /* To convert to RAID0 we need to fail and
2892 * remove any non-data devices. */
2895 int data_disks
= array
.raid_disks
- 1;
2896 if (array
.level
== 6)
2898 if (array
.level
== 5 &&
2899 array
.layout
!= ALGORITHM_PARITY_N
)
2901 if (array
.level
== 6 &&
2902 array
.layout
!= ALGORITHM_PARITY_N_6
)
2904 sysfs_set_str(&info
, NULL
,"sync_action", "idle");
2905 /* First remove any spares so no recovery starts */
2906 for (d
= 0, found
= 0;
2907 d
< MAX_DISKS
&& found
< array
.nr_disks
;
2909 mdu_disk_info_t disk
;
2911 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
2913 if (disk
.major
== 0 && disk
.minor
== 0)
2916 if ((disk
.state
& (1 << MD_DISK_ACTIVE
))
2917 && disk
.raid_disk
< data_disks
)
2920 ioctl(fd
, HOT_REMOVE_DISK
,
2921 makedev(disk
.major
, disk
.minor
));
2923 /* Now fail anything left */
2924 md_get_array_info(fd
, &array
);
2925 for (d
= 0, found
= 0;
2926 d
< MAX_DISKS
&& found
< array
.nr_disks
;
2928 mdu_disk_info_t disk
;
2930 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
2932 if (disk
.major
== 0 && disk
.minor
== 0)
2935 if ((disk
.state
& (1 << MD_DISK_ACTIVE
))
2936 && disk
.raid_disk
< data_disks
)
2939 ioctl(fd
, SET_DISK_FAULTY
,
2940 makedev(disk
.major
, disk
.minor
));
2941 hot_remove_disk(fd
, makedev(disk
.major
, disk
.minor
), 1);
2944 c
= map_num(pers
, level
);
2946 int err
= sysfs_set_str(&info
, NULL
, "level", c
);
2949 pr_err("%s: could not set level to %s\n",
2952 (array
.state
& (1<<MD_SB_BITMAP_PRESENT
)))
2953 cont_err("Bitmap must be removed before level can be changed\n");
2957 pr_err("level of %s changed to %s\n",
2964 static void catch_term(int sig
)
2969 static int continue_via_systemd(char *devnm
)
2971 int skipped
, i
, pid
, status
;
2973 /* In a systemd/udev world, it is best to get systemd to
2974 * run "mdadm --grow --continue" rather than running in the
2979 /* FIXME yuk. CLOSE_EXEC?? */
2981 for (i
= 3; skipped
< 20; i
++)
2987 /* Don't want to see error messages from
2988 * systemctl. If the service doesn't exist,
2989 * we fork ourselves.
2992 open("/dev/null", O_WRONLY
);
2993 snprintf(pathbuf
, sizeof(pathbuf
), "mdadm-grow-continue@%s.service",
2995 status
= execl("/usr/bin/systemctl", "systemctl",
2998 status
= execl("/bin/systemctl", "systemctl", "start",
3001 case -1: /* Just do it ourselves. */
3003 default: /* parent - good */
3004 pid
= wait(&status
);
3005 if (pid
>= 0 && status
== 0)
3011 static int reshape_array(char *container
, int fd
, char *devname
,
3012 struct supertype
*st
, struct mdinfo
*info
,
3013 int force
, struct mddev_dev
*devlist
,
3014 unsigned long long data_offset
,
3015 char *backup_file
, int verbose
, int forked
,
3016 int restart
, int freeze_reshape
)
3018 struct reshape reshape
;
3021 int orig_level
= UnSet
;
3025 struct mdu_array_info_s array
;
3028 struct mddev_dev
*dv
;
3032 unsigned long long *offsets
= NULL
;
3036 unsigned long blocks
;
3037 unsigned long long array_size
;
3039 struct mdinfo
*sra
= NULL
;
3042 /* when reshaping a RAID0, the component_size might be zero.
3043 * So try to fix that up.
3045 if (md_get_array_info(fd
, &array
) != 0) {
3046 dprintf("Cannot get array information.\n");
3049 if (array
.level
== 0 && info
->component_size
== 0) {
3050 get_dev_size(fd
, NULL
, &array_size
);
3051 info
->component_size
= array_size
/ array
.raid_disks
;
3054 if (array
.level
== 10)
3055 /* Need space_after info */
3056 get_space_after(fd
, st
, info
);
3058 if (info
->reshape_active
) {
3059 int new_level
= info
->new_level
;
3060 info
->new_level
= UnSet
;
3061 if (info
->delta_disks
> 0)
3062 info
->array
.raid_disks
-= info
->delta_disks
;
3063 msg
= analyse_change(devname
, info
, &reshape
);
3064 info
->new_level
= new_level
;
3065 if (info
->delta_disks
> 0)
3066 info
->array
.raid_disks
+= info
->delta_disks
;
3068 /* Make sure the array isn't read-only */
3069 ioctl(fd
, RESTART_ARRAY_RW
, 0);
3071 msg
= analyse_change(devname
, info
, &reshape
);
3073 /* if msg == "", error has already been printed */
3075 pr_err("%s\n", msg
);
3079 (reshape
.level
!= info
->array
.level
||
3080 reshape
.before
.layout
!= info
->array
.layout
||
3081 reshape
.before
.data_disks
+ reshape
.parity
3082 != info
->array
.raid_disks
- max(0, info
->delta_disks
))) {
3083 pr_err("reshape info is not in native format - cannot continue.\n");
3087 if (st
->ss
->external
&& restart
&& (info
->reshape_progress
== 0) &&
3088 !((sysfs_get_str(info
, NULL
, "sync_action", buf
, sizeof(buf
)) > 0) &&
3089 (strncmp(buf
, "reshape", 7) == 0))) {
3090 /* When reshape is restarted from '0', very begin of array
3091 * it is possible that for external metadata reshape and array
3092 * configuration doesn't happen.
3093 * Check if md has the same opinion, and reshape is restarted
3094 * from 0. If so, this is regular reshape start after reshape
3095 * switch in metadata to next array only.
3097 if ((verify_reshape_position(info
, reshape
.level
) >= 0) &&
3098 (info
->reshape_progress
== 0))
3102 /* reshape already started. just skip to monitoring the reshape */
3103 if (reshape
.backup_blocks
== 0)
3105 if (restart
& RESHAPE_NO_BACKUP
)
3108 /* Need 'sra' down at 'started:' */
3109 sra
= sysfs_read(fd
, NULL
,
3110 GET_COMPONENT
|GET_DEVS
|GET_OFFSET
|GET_STATE
|GET_CHUNK
|
3113 pr_err("%s: Cannot get array details from sysfs\n",
3119 backup_file
= locate_backup(sra
->sys_name
);
3123 /* The container is frozen but the array may not be.
3124 * So freeze the array so spares don't get put to the wrong use
3125 * FIXME there should probably be a cleaner separation between
3126 * freeze_array and freeze_container.
3128 sysfs_freeze_array(info
);
3129 /* Check we have enough spares to not be degraded */
3131 for (dv
= devlist
; dv
; dv
=dv
->next
)
3133 spares_needed
= max(reshape
.before
.data_disks
,
3134 reshape
.after
.data_disks
)
3135 + reshape
.parity
- array
.raid_disks
;
3138 info
->new_level
> 1 && info
->array
.level
> 1 &&
3139 spares_needed
> info
->array
.spare_disks
+ added_disks
) {
3140 pr_err("Need %d spare%s to avoid degraded array, and only have %d.\n"
3141 " Use --force to over-ride this check.\n",
3143 spares_needed
== 1 ? "" : "s",
3144 info
->array
.spare_disks
+ added_disks
);
3147 /* Check we have enough spares to not fail */
3148 spares_needed
= max(reshape
.before
.data_disks
,
3149 reshape
.after
.data_disks
)
3151 if ((info
->new_level
> 1 || info
->new_level
== 0) &&
3152 spares_needed
> info
->array
.spare_disks
+added_disks
) {
3153 pr_err("Need %d spare%s to create working array, and only have %d.\n",
3155 spares_needed
== 1 ? "" : "s",
3156 info
->array
.spare_disks
+ added_disks
);
3160 if (reshape
.level
!= array
.level
) {
3161 int err
= impose_level(fd
, reshape
.level
, devname
, verbose
);
3164 info
->new_layout
= UnSet
; /* after level change,
3165 * layout is meaningless */
3166 orig_level
= array
.level
;
3167 sysfs_freeze_array(info
);
3169 if (reshape
.level
> 0 && st
->ss
->external
) {
3170 /* make sure mdmon is aware of the new level */
3171 if (mdmon_running(container
))
3172 flush_mdmon(container
);
3174 if (!mdmon_running(container
))
3175 start_mdmon(container
);
3176 ping_monitor(container
);
3177 if (mdmon_running(container
) &&
3178 st
->update_tail
== NULL
)
3179 st
->update_tail
= &st
->updates
;
3182 /* ->reshape_super might have chosen some spares from the
3183 * container that it wants to be part of the new array.
3184 * We can collect them with ->container_content and give
3185 * them to the kernel.
3187 if (st
->ss
->reshape_super
&& st
->ss
->container_content
) {
3188 char *subarray
= strchr(info
->text_version
+1, '/')+1;
3189 struct mdinfo
*info2
=
3190 st
->ss
->container_content(st
, subarray
);
3194 sysfs_init(info2
, fd
, st
->devnm
);
3195 /* When increasing number of devices, we need to set
3196 * new raid_disks before adding these, or they might
3199 if (reshape
.backup_blocks
&&
3200 reshape
.after
.data_disks
> reshape
.before
.data_disks
)
3201 subarray_set_num(container
, info2
, "raid_disks",
3202 reshape
.after
.data_disks
+
3204 for (d
= info2
->devs
; d
; d
= d
->next
) {
3205 if (d
->disk
.state
== 0 &&
3206 d
->disk
.raid_disk
>= 0) {
3207 /* This is a spare that wants to
3208 * be part of the array.
3210 add_disk(fd
, st
, info2
, d
);
3216 /* We might have been given some devices to add to the
3217 * array. Now that the array has been changed to the right
3218 * level and frozen, we can safely add them.
3221 if (Manage_subdevs(devname
, fd
, devlist
, verbose
,
3226 if (reshape
.backup_blocks
== 0 && data_offset
!= INVALID_SECTORS
)
3227 reshape
.backup_blocks
= reshape
.before
.data_disks
* info
->array
.chunk_size
/512;
3228 if (reshape
.backup_blocks
== 0) {
3229 /* No restriping needed, but we might need to impose
3230 * some more changes: layout, raid_disks, chunk_size
3232 /* read current array info */
3233 if (md_get_array_info(fd
, &array
) != 0) {
3234 dprintf("Cannot get array information.\n");
3237 /* compare current array info with new values and if
3238 * it is different update them to new */
3239 if (info
->new_layout
!= UnSet
&&
3240 info
->new_layout
!= array
.layout
) {
3241 array
.layout
= info
->new_layout
;
3242 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
3243 pr_err("failed to set new layout\n");
3245 } else if (verbose
>= 0)
3246 printf("layout for %s set to %d\n",
3247 devname
, array
.layout
);
3249 if (info
->delta_disks
!= UnSet
&&
3250 info
->delta_disks
!= 0 &&
3251 array
.raid_disks
!= (info
->array
.raid_disks
+ info
->delta_disks
)) {
3252 array
.raid_disks
+= info
->delta_disks
;
3253 if (ioctl(fd
, SET_ARRAY_INFO
, &array
) != 0) {
3254 pr_err("failed to set raid disks\n");
3256 } else if (verbose
>= 0) {
3257 printf("raid_disks for %s set to %d\n",
3258 devname
, array
.raid_disks
);
3261 if (info
->new_chunk
!= 0 &&
3262 info
->new_chunk
!= array
.chunk_size
) {
3263 if (sysfs_set_num(info
, NULL
,
3264 "chunk_size", info
->new_chunk
) != 0) {
3265 pr_err("failed to set chunk size\n");
3267 } else if (verbose
>= 0)
3268 printf("chunk size for %s set to %d\n",
3269 devname
, array
.chunk_size
);
3276 * There are three possibilities.
3277 * 1/ The array will shrink.
3278 * We need to ensure the reshape will pause before reaching
3279 * the 'critical section'. We also need to fork and wait for
3280 * that to happen. When it does we
3281 * suspend/backup/complete/unfreeze
3283 * 2/ The array will not change size.
3284 * This requires that we keep a backup of a sliding window
3285 * so that we can restore data after a crash. So we need
3286 * to fork and monitor progress.
3287 * In future we will allow the data_offset to change, so
3288 * a sliding backup becomes unnecessary.
3290 * 3/ The array will grow. This is relatively easy.
3291 * However the kernel's restripe routines will cheerfully
3292 * overwrite some early data before it is safe. So we
3293 * need to make a backup of the early parts of the array
3294 * and be ready to restore it if rebuild aborts very early.
3295 * For externally managed metadata, we still need a forked
3296 * child to monitor the reshape and suspend IO over the region
3297 * that is being reshaped.
3299 * We backup data by writing it to one spare, or to a
3300 * file which was given on command line.
3302 * In each case, we first make sure that storage is available
3303 * for the required backup.
3305 * - request the shape change.
3306 * - fork to handle backup etc.
3308 /* Check that we can hold all the data */
3309 get_dev_size(fd
, NULL
, &array_size
);
3310 if (reshape
.new_size
< (array_size
/512)) {
3311 pr_err("this change will reduce the size of the array.\n"
3312 " use --grow --array-size first to truncate array.\n"
3313 " e.g. mdadm --grow %s --array-size %llu\n",
3314 devname
, reshape
.new_size
/2);
3318 if (array
.level
== 10) {
3319 /* Reshaping RAID10 does not require any data backup by
3320 * user-space. Instead it requires that the data_offset
3321 * is changed to avoid the need for backup.
3322 * So this is handled very separately
3325 /* Nothing to do. */
3327 return raid10_reshape(container
, fd
, devname
, st
, info
,
3328 &reshape
, data_offset
,
3331 sra
= sysfs_read(fd
, NULL
,
3332 GET_COMPONENT
|GET_DEVS
|GET_OFFSET
|GET_STATE
|GET_CHUNK
|
3335 pr_err("%s: Cannot get array details from sysfs\n",
3341 switch(set_new_data_offset(sra
, st
, devname
,
3342 reshape
.after
.data_disks
- reshape
.before
.data_disks
,
3344 reshape
.min_offset_change
, 1)) {
3348 /* Updated data_offset, so it's easy now */
3349 update_cache_size(container
, sra
, info
,
3350 min(reshape
.before
.data_disks
,
3351 reshape
.after
.data_disks
),
3352 reshape
.backup_blocks
);
3354 /* Right, everything seems fine. Let's kick things off.
3358 if (impose_reshape(sra
, info
, st
, fd
, restart
,
3359 devname
, container
, &reshape
) < 0)
3361 if (sysfs_set_str(sra
, NULL
, "sync_action", "reshape") < 0) {
3363 if (errno
!= EINVAL
) {
3364 pr_err("Failed to initiate reshape!\n");
3367 /* revert data_offset and try the old way */
3368 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
3369 sysfs_set_num(sra
, sd
, "new_offset",
3371 sysfs_set_str(sra
, NULL
, "reshape_direction",
3376 if (info
->new_level
== reshape
.level
)
3378 /* need to adjust level when reshape completes */
3380 case -1: /* ignore error, but don't wait */
3382 default: /* parent */
3390 fd
= open_dev(sra
->sys_name
);
3392 impose_level(fd
, info
->new_level
, devname
, verbose
);
3394 case 1: /* Couldn't set data_offset, try the old way */
3395 if (data_offset
!= INVALID_SECTORS
) {
3396 pr_err("Cannot update data_offset on this array\n");
3403 /* Decide how many blocks (sectors) for a reshape
3404 * unit. The number we have so far is just a minimum
3406 blocks
= reshape
.backup_blocks
;
3407 if (reshape
.before
.data_disks
==
3408 reshape
.after
.data_disks
) {
3409 /* Make 'blocks' bigger for better throughput, but
3410 * not so big that we reject it below.
3411 * Try for 16 megabytes
3413 while (blocks
* 32 < sra
->component_size
&&
3417 pr_err("Need to backup %luK of critical section..\n", blocks
/2);
3419 if (blocks
>= sra
->component_size
/2) {
3420 pr_err("%s: Something wrong - reshape aborted\n",
3425 /* Now we need to open all these devices so we can read/write.
3427 nrdisks
= max(reshape
.before
.data_disks
,
3428 reshape
.after
.data_disks
) + reshape
.parity
3429 + sra
->array
.spare_disks
;
3430 fdlist
= xcalloc((1+nrdisks
), sizeof(int));
3431 offsets
= xcalloc((1+nrdisks
), sizeof(offsets
[0]));
3433 odisks
= reshape
.before
.data_disks
+ reshape
.parity
;
3434 d
= reshape_prepare_fdlist(devname
, sra
, odisks
,
3435 nrdisks
, blocks
, backup_file
,
3440 if ((st
->ss
->manage_reshape
== NULL
) ||
3441 (st
->ss
->recover_backup
== NULL
)) {
3442 if (backup_file
== NULL
) {
3443 if (reshape
.after
.data_disks
<=
3444 reshape
.before
.data_disks
) {
3445 pr_err("%s: Cannot grow - need backup-file\n",
3447 pr_err(" Please provide one with \"--backup=...\"\n");
3449 } else if (d
== odisks
) {
3450 pr_err("%s: Cannot grow - need a spare or backup-file to backup critical section\n", devname
);
3454 if (!reshape_open_backup_file(backup_file
, fd
, devname
,
3456 fdlist
+d
, offsets
+d
,
3465 update_cache_size(container
, sra
, info
,
3466 min(reshape
.before
.data_disks
, reshape
.after
.data_disks
),
3469 /* Right, everything seems fine. Let's kick things off.
3470 * If only changing raid_disks, use ioctl, else use
3475 if (impose_reshape(sra
, info
, st
, fd
, restart
,
3476 devname
, container
, &reshape
) < 0)
3479 err
= start_reshape(sra
, restart
, reshape
.before
.data_disks
,
3480 reshape
.after
.data_disks
);
3482 pr_err("Cannot %s reshape for %s\n",
3483 restart
? "continue" : "start",
3488 sysfs_set_str(sra
, NULL
, "array_state", "active");
3489 if (freeze_reshape
) {
3493 pr_err("Reshape has to be continued from location %llu when root filesystem has been mounted.\n",
3494 sra
->reshape_progress
);
3498 if (!forked
&& !check_env("MDADM_NO_SYSTEMCTL"))
3499 if (continue_via_systemd(container
?: sra
->sys_name
)) {
3506 /* Now we just need to kick off the reshape and watch, while
3507 * handling backups of the data...
3508 * This is all done by a forked background process.
3510 switch(forked
? 0 : fork()) {
3512 pr_err("Cannot run child to monitor reshape: %s\n",
3526 /* If another array on the same devices is busy, the
3527 * reshape will wait for them. This would mean that
3528 * the first section that we suspend will stay suspended
3529 * for a long time. So check on that possibility
3530 * by looking for "DELAYED" in /proc/mdstat, and if found,
3534 struct mdstat_ent
*mds
, *m
;
3536 mds
= mdstat_read(1, 0);
3537 for (m
= mds
; m
; m
= m
->next
)
3538 if (strcmp(m
->devnm
, sra
->sys_name
) == 0) {
3540 m
->percent
== RESYNC_DELAYED
)
3543 /* Haven't started the reshape thread
3550 if (delayed
== 1 && get_linux_version() < 3007000) {
3551 pr_err("Reshape is delayed, but cannot wait carefully with this kernel.\n"
3552 " You might experience problems until other reshapes complete.\n");
3556 mdstat_wait(30 - (delayed
-1) * 25);
3560 if (check_env("MDADM_GROW_VERIFY"))
3561 fd
= open(devname
, O_RDONLY
| O_DIRECT
);
3564 mlockall(MCL_FUTURE
);
3566 signal(SIGTERM
, catch_term
);
3568 if (st
->ss
->external
) {
3569 /* metadata handler takes it from here */
3570 done
= st
->ss
->manage_reshape(
3571 fd
, sra
, &reshape
, st
, blocks
,
3573 d
- odisks
, fdlist
+odisks
,
3576 done
= child_monitor(
3577 fd
, sra
, &reshape
, st
, blocks
,
3579 d
- odisks
, fdlist
+odisks
,
3585 if (backup_file
&& done
) {
3587 bul
= make_backup(sra
->sys_name
);
3590 int l
= readlink(bul
, buf
, sizeof(buf
) - 1);
3598 unlink(backup_file
);
3605 if (!st
->ss
->external
&&
3606 !(reshape
.before
.data_disks
!= reshape
.after
.data_disks
3607 && info
->custom_array_size
) &&
3608 info
->new_level
== reshape
.level
&&
3610 /* no need to wait for the reshape to finish as
3611 * there is nothing more to do.
3618 if (st
->ss
->external
) {
3619 /* Re-load the metadata as much could have changed */
3620 int cfd
= open_dev(st
->container_devnm
);
3622 flush_mdmon(container
);
3623 st
->ss
->free_super(st
);
3624 st
->ss
->load_container(st
, cfd
, container
);
3629 /* set new array size if required customer_array_size is used
3632 if (reshape
.before
.data_disks
!=
3633 reshape
.after
.data_disks
&&
3634 info
->custom_array_size
)
3635 set_array_size(st
, info
, info
->text_version
);
3637 if (info
->new_level
!= reshape
.level
) {
3639 fd
= open(devname
, O_RDONLY
);
3640 impose_level(fd
, info
->new_level
, devname
, verbose
);
3642 if (info
->new_level
== 0)
3643 st
->update_tail
= NULL
;
3655 if (orig_level
!= UnSet
&& sra
) {
3656 c
= map_num(pers
, orig_level
);
3657 if (c
&& sysfs_set_str(sra
, NULL
, "level", c
) == 0)
3658 pr_err("aborting level change\n");
3666 /* mdfd handle is passed to be closed in child process (after fork).
3668 int reshape_container(char *container
, char *devname
,
3670 struct supertype
*st
,
3671 struct mdinfo
*info
,
3673 char *backup_file
, int verbose
,
3674 int forked
, int restart
, int freeze_reshape
)
3676 struct mdinfo
*cc
= NULL
;
3678 char last_devnm
[32] = "";
3680 /* component_size is not meaningful for a container,
3681 * so pass '0' meaning 'no change'
3684 reshape_super(st
, 0, info
->new_level
,
3685 info
->new_layout
, info
->new_chunk
,
3686 info
->array
.raid_disks
, info
->delta_disks
,
3687 backup_file
, devname
, APPLY_METADATA_CHANGES
,
3695 /* ping monitor to be sure that update is on disk
3697 ping_monitor(container
);
3699 if (!forked
&& !freeze_reshape
&& !check_env("MDADM_NO_SYSTEMCTL"))
3700 if (continue_via_systemd(container
))
3703 switch (forked
? 0 : fork()) {
3704 case -1: /* error */
3705 perror("Cannot fork to complete reshape\n");
3708 default: /* parent */
3709 if (!freeze_reshape
)
3710 printf("%s: multi-array reshape continues in background\n", Name
);
3717 /* close unused handle in child process
3723 /* For each member array with reshape_active,
3724 * we need to perform the reshape.
3725 * We pick the first array that needs reshaping and
3726 * reshape it. reshape_array() will re-read the metadata
3727 * so the next time through a different array should be
3728 * ready for reshape.
3729 * It is possible that the 'different' array will not
3730 * be assembled yet. In that case we simple exit.
3731 * When it is assembled, the mdadm which assembles it
3732 * will take over the reshape.
3734 struct mdinfo
*content
;
3736 struct mdstat_ent
*mdstat
;
3742 cc
= st
->ss
->container_content(st
, NULL
);
3744 for (content
= cc
; content
; content
= content
->next
) {
3746 if (!content
->reshape_active
)
3749 subarray
= strchr(content
->text_version
+1, '/')+1;
3750 mdstat
= mdstat_by_subdev(subarray
, container
);
3753 if (mdstat
->active
== 0) {
3754 pr_err("Skipping inactive array %s.\n",
3756 free_mdstat(mdstat
);
3765 devid
= devnm2devid(mdstat
->devnm
);
3766 adev
= map_dev(major(devid
), minor(devid
), 0);
3768 adev
= content
->text_version
;
3770 fd
= open_dev(mdstat
->devnm
);
3772 pr_err("Device %s cannot be opened for reshape.\n", adev
);
3776 if (strcmp(last_devnm
, mdstat
->devnm
) == 0) {
3777 /* Do not allow for multiple reshape_array() calls for
3779 * It can happen when reshape_array() returns without
3780 * error, when reshape is not finished (wrong reshape
3781 * starting/continuation conditions). Mdmon doesn't
3782 * switch to next array in container and reentry
3783 * conditions for the same array occur.
3784 * This is possibly interim until the behaviour of
3785 * reshape_array is resolved().
3787 printf("%s: Multiple reshape execution detected for device %s.\n", Name
, adev
);
3791 strcpy(last_devnm
, mdstat
->devnm
);
3793 sysfs_init(content
, fd
, mdstat
->devnm
);
3795 if (mdmon_running(container
))
3796 flush_mdmon(container
);
3798 rv
= reshape_array(container
, fd
, adev
, st
,
3799 content
, force
, NULL
, INVALID_SECTORS
,
3800 backup_file
, verbose
, 1, restart
,
3804 if (freeze_reshape
) {
3813 if (mdmon_running(container
))
3814 flush_mdmon(container
);
3823 * We run a child process in the background which performs the following
3825 * - wait for resync to reach a certain point
3826 * - suspend io to the following section
3827 * - backup that section
3828 * - allow resync to proceed further
3830 * - discard the backup.
3832 * When are combined in slightly different ways in the three cases.
3834 * - suspend/backup/allow/wait/resume/discard
3836 * - allow/wait/suspend/backup/allow/wait/resume/discard
3838 * - wait/resume/discard/suspend/backup/allow
3840 * suspend/backup/allow always come together
3841 * wait/resume/discard do too.
3842 * For the same-size case we have two backups to improve flow.
3846 int progress_reshape(struct mdinfo
*info
, struct reshape
*reshape
,
3847 unsigned long long backup_point
,
3848 unsigned long long wait_point
,
3849 unsigned long long *suspend_point
,
3850 unsigned long long *reshape_completed
, int *frozen
)
3852 /* This function is called repeatedly by the reshape manager.
3853 * It determines how much progress can safely be made and allows
3855 * - 'info' identifies the array and particularly records in
3856 * ->reshape_progress the metadata's knowledge of progress
3857 * This is a sector offset from the start of the array
3858 * of the next array block to be relocated. This number
3859 * may increase from 0 or decrease from array_size, depending
3860 * on the type of reshape that is happening.
3861 * Note that in contrast, 'sync_completed' is a block count of the
3862 * reshape so far. It gives the distance between the start point
3863 * (head or tail of device) and the next place that data will be
3864 * written. It always increases.
3865 * - 'reshape' is the structure created by analyse_change
3866 * - 'backup_point' shows how much the metadata manager has backed-up
3867 * data. For reshapes with increasing progress, it is the next address
3868 * to be backed up, previous addresses have been backed-up. For
3869 * decreasing progress, it is the earliest address that has been
3870 * backed up - later address are also backed up.
3871 * So addresses between reshape_progress and backup_point are
3872 * backed up providing those are in the 'correct' order.
3873 * - 'wait_point' is an array address. When reshape_completed
3874 * passes this point, progress_reshape should return. It might
3875 * return earlier if it determines that ->reshape_progress needs
3876 * to be updated or further backup is needed.
3877 * - suspend_point is maintained by progress_reshape and the caller
3878 * should not touch it except to initialise to zero.
3879 * It is an array address and it only increases in 2.6.37 and earlier.
3880 * This makes it difficult to handle reducing reshapes with
3881 * external metadata.
3882 * However: it is similar to backup_point in that it records the
3883 * other end of a suspended region from reshape_progress.
3884 * it is moved to extend the region that is safe to backup and/or
3886 * - reshape_completed is read from sysfs and returned. The caller
3887 * should copy this into ->reshape_progress when it has reason to
3888 * believe that the metadata knows this, and any backup outside this
3892 * 1 if more data from backup_point - but only as far as suspend_point,
3893 * should be backed up
3894 * 0 if things are progressing smoothly
3895 * -1 if the reshape is finished because it is all done,
3896 * -2 if the reshape is finished due to an error.
3899 int advancing
= (reshape
->after
.data_disks
3900 >= reshape
->before
.data_disks
);
3901 unsigned long long need_backup
; /* All data between start of array and
3902 * here will at some point need to
3905 unsigned long long read_offset
, write_offset
;
3906 unsigned long long write_range
;
3907 unsigned long long max_progress
, target
, completed
;
3908 unsigned long long array_size
= (info
->component_size
3909 * reshape
->before
.data_disks
);
3913 /* First, we unsuspend any region that is now known to be safe.
3914 * If suspend_point is on the 'wrong' side of reshape_progress, then
3915 * we don't have or need suspension at the moment. This is true for
3916 * native metadata when we don't need to back-up.
3919 if (info
->reshape_progress
<= *suspend_point
)
3920 sysfs_set_num(info
, NULL
, "suspend_lo",
3921 info
->reshape_progress
);
3923 /* Note: this won't work in 2.6.37 and before.
3924 * Something somewhere should make sure we don't need it!
3926 if (info
->reshape_progress
>= *suspend_point
)
3927 sysfs_set_num(info
, NULL
, "suspend_hi",
3928 info
->reshape_progress
);
3931 /* Now work out how far it is safe to progress.
3932 * If the read_offset for ->reshape_progress is less than
3933 * 'blocks' beyond the write_offset, we can only progress as far
3935 * Otherwise we can progress until the write_offset for the new location
3936 * reaches (within 'blocks' of) the read_offset at the current location.
3937 * However that region must be suspended unless we are using native
3939 * If we need to suspend more, we limit it to 128M per device, which is
3940 * rather arbitrary and should be some time-based calculation.
3942 read_offset
= info
->reshape_progress
/ reshape
->before
.data_disks
;
3943 write_offset
= info
->reshape_progress
/ reshape
->after
.data_disks
;
3944 write_range
= info
->new_chunk
/512;
3945 if (reshape
->before
.data_disks
== reshape
->after
.data_disks
)
3946 need_backup
= array_size
;
3948 need_backup
= reshape
->backup_blocks
;
3950 if (read_offset
< write_offset
+ write_range
)
3951 max_progress
= backup_point
;
3955 reshape
->after
.data_disks
;
3957 if (read_offset
> write_offset
- write_range
)
3958 /* Can only progress as far as has been backed up,
3959 * which must be suspended */
3960 max_progress
= backup_point
;
3961 else if (info
->reshape_progress
<= need_backup
)
3962 max_progress
= backup_point
;
3964 if (info
->array
.major_version
>= 0)
3965 /* Can progress until backup is needed */
3966 max_progress
= need_backup
;
3968 /* Can progress until metadata update is required */
3971 reshape
->after
.data_disks
;
3972 /* but data must be suspended */
3973 if (max_progress
< *suspend_point
)
3974 max_progress
= *suspend_point
;
3979 /* We know it is safe to progress to 'max_progress' providing
3980 * it is suspended or we are using native metadata.
3981 * Consider extending suspend_point 128M per device if it
3982 * is less than 64M per device beyond reshape_progress.
3983 * But always do a multiple of 'blocks'
3984 * FIXME this is too big - it takes to long to complete
3987 target
= 64*1024*2 * min(reshape
->before
.data_disks
,
3988 reshape
->after
.data_disks
);
3989 target
/= reshape
->backup_blocks
;
3992 target
*= reshape
->backup_blocks
;
3994 /* For externally managed metadata we always need to suspend IO to
3995 * the area being reshaped so we regularly push suspend_point forward.
3996 * For native metadata we only need the suspend if we are going to do
4000 if ((need_backup
> info
->reshape_progress
4001 || info
->array
.major_version
< 0) &&
4002 *suspend_point
< info
->reshape_progress
+ target
) {
4003 if (need_backup
< *suspend_point
+ 2 * target
)
4004 *suspend_point
= need_backup
;
4005 else if (*suspend_point
+ 2 * target
< array_size
)
4006 *suspend_point
+= 2 * target
;
4008 *suspend_point
= array_size
;
4009 sysfs_set_num(info
, NULL
, "suspend_hi", *suspend_point
);
4010 if (max_progress
> *suspend_point
)
4011 max_progress
= *suspend_point
;
4014 if (info
->array
.major_version
>= 0) {
4015 /* Only need to suspend when about to backup */
4016 if (info
->reshape_progress
< need_backup
* 2 &&
4017 *suspend_point
> 0) {
4019 sysfs_set_num(info
, NULL
, "suspend_lo", 0);
4020 sysfs_set_num(info
, NULL
, "suspend_hi", need_backup
);
4023 /* Need to suspend continually */
4024 if (info
->reshape_progress
< *suspend_point
)
4025 *suspend_point
= info
->reshape_progress
;
4026 if (*suspend_point
+ target
< info
->reshape_progress
)
4027 /* No need to move suspend region yet */;
4029 if (*suspend_point
>= 2 * target
)
4030 *suspend_point
-= 2 * target
;
4033 sysfs_set_num(info
, NULL
, "suspend_lo",
4036 if (max_progress
< *suspend_point
)
4037 max_progress
= *suspend_point
;
4041 /* now set sync_max to allow that progress. sync_max, like
4042 * sync_completed is a count of sectors written per device, so
4043 * we find the difference between max_progress and the start point,
4044 * and divide that by after.data_disks to get a sync_max
4046 * At the same time we convert wait_point to a similar number
4047 * for comparing against sync_completed.
4049 /* scale down max_progress to per_disk */
4050 max_progress
/= reshape
->after
.data_disks
;
4051 /* Round to chunk size as some kernels give an erroneously high number */
4052 max_progress
/= info
->new_chunk
/512;
4053 max_progress
*= info
->new_chunk
/512;
4054 /* And round to old chunk size as the kernel wants that */
4055 max_progress
/= info
->array
.chunk_size
/512;
4056 max_progress
*= info
->array
.chunk_size
/512;
4057 /* Limit progress to the whole device */
4058 if (max_progress
> info
->component_size
)
4059 max_progress
= info
->component_size
;
4060 wait_point
/= reshape
->after
.data_disks
;
4062 /* switch from 'device offset' to 'processed block count' */
4063 max_progress
= info
->component_size
- max_progress
;
4064 wait_point
= info
->component_size
- wait_point
;
4068 sysfs_set_num(info
, NULL
, "sync_max", max_progress
);
4070 /* Now wait. If we have already reached the point that we were
4071 * asked to wait to, don't wait at all, else wait for any change.
4072 * We need to select on 'sync_completed' as that is the place that
4073 * notifications happen, but we are really interested in
4074 * 'reshape_position'
4076 fd
= sysfs_get_fd(info
, NULL
, "sync_completed");
4078 goto check_progress
;
4080 if (sysfs_fd_get_ll(fd
, &completed
) < 0)
4081 goto check_progress
;
4083 while (completed
< max_progress
&& completed
< wait_point
) {
4084 /* Check that sync_action is still 'reshape' to avoid
4085 * waiting forever on a dead array
4088 if (sysfs_get_str(info
, NULL
, "sync_action",
4090 strncmp(action
, "reshape", 7) != 0)
4092 /* Some kernels reset 'sync_completed' to zero
4093 * before setting 'sync_action' to 'idle'.
4094 * So we need these extra tests.
4096 if (completed
== 0 && advancing
4097 && strncmp(action
, "idle", 4) == 0
4098 && info
->reshape_progress
> 0)
4100 if (completed
== 0 && !advancing
4101 && strncmp(action
, "idle", 4) == 0
4102 && info
->reshape_progress
< (info
->component_size
4103 * reshape
->after
.data_disks
))
4105 sysfs_wait(fd
, NULL
);
4106 if (sysfs_fd_get_ll(fd
, &completed
) < 0)
4107 goto check_progress
;
4109 /* Some kernels reset 'sync_completed' to zero,
4110 * we need to have real point we are in md.
4111 * So in that case, read 'reshape_position' from sysfs.
4113 if (completed
== 0) {
4114 unsigned long long reshapep
;
4116 if (sysfs_get_str(info
, NULL
, "sync_action",
4118 strncmp(action
, "idle", 4) == 0 &&
4119 sysfs_get_ll(info
, NULL
,
4120 "reshape_position", &reshapep
) == 0)
4121 *reshape_completed
= reshapep
;
4123 /* some kernels can give an incorrectly high
4124 * 'completed' number, so round down */
4125 completed
/= (info
->new_chunk
/512);
4126 completed
*= (info
->new_chunk
/512);
4127 /* Convert 'completed' back in to a 'progress' number */
4128 completed
*= reshape
->after
.data_disks
;
4130 completed
= (info
->component_size
4131 * reshape
->after
.data_disks
4133 *reshape_completed
= completed
;
4138 /* We return the need_backup flag. Caller will decide
4139 * how much - a multiple of ->backup_blocks up to *suspend_point
4142 return need_backup
> info
->reshape_progress
;
4144 return need_backup
>= info
->reshape_progress
;
4147 /* if we couldn't read a number from sync_completed, then
4148 * either the reshape did complete, or it aborted.
4149 * We can tell which by checking for 'none' in reshape_position.
4150 * If it did abort, then it might immediately restart if it
4151 * it was just a device failure that leaves us degraded but
4154 if (sysfs_get_str(info
, NULL
, "reshape_position", buf
, sizeof(buf
)) < 0
4155 || strncmp(buf
, "none", 4) != 0) {
4156 /* The abort might only be temporary. Wait up to 10
4157 * seconds for fd to contain a valid number again.
4161 unsigned long long new_sync_max
;
4162 while (fd
>= 0 && rv
< 0 && wait
> 0) {
4163 if (sysfs_wait(fd
, &wait
) != 1)
4165 switch (sysfs_fd_get_ll(fd
, &completed
)) {
4167 /* all good again */
4169 /* If "sync_max" is no longer max_progress
4170 * we need to freeze things
4172 sysfs_get_ll(info
, NULL
, "sync_max", &new_sync_max
);
4173 *frozen
= (new_sync_max
!= max_progress
);
4175 case -2: /* read error - abort */
4182 return rv
; /* abort */
4184 /* Maybe racing with array shutdown - check state */
4187 if (sysfs_get_str(info
, NULL
, "array_state", buf
, sizeof(buf
)) < 0
4188 || strncmp(buf
, "inactive", 8) == 0
4189 || strncmp(buf
, "clear",5) == 0)
4190 return -2; /* abort */
4191 return -1; /* complete */
4195 /* FIXME return status is never checked */
4196 static int grow_backup(struct mdinfo
*sra
,
4197 unsigned long long offset
, /* per device */
4198 unsigned long stripes
, /* per device, in old chunks */
4199 int *sources
, unsigned long long *offsets
,
4200 int disks
, int chunk
, int level
, int layout
,
4201 int dests
, int *destfd
, unsigned long long *destoffsets
,
4202 int part
, int *degraded
,
4205 /* Backup 'blocks' sectors at 'offset' on each device of the array,
4206 * to storage 'destfd' (offset 'destoffsets'), after first
4207 * suspending IO. Then allow resync to continue
4208 * over the suspended section.
4209 * Use part 'part' of the backup-super-block.
4214 unsigned long long ll
;
4216 //printf("offset %llu\n", offset);
4222 /* Check that array hasn't become degraded, else we might backup the wrong data */
4223 if (sysfs_get_ll(sra
, NULL
, "degraded", &ll
) < 0)
4224 return -1; /* FIXME this error is ignored */
4225 new_degraded
= (int)ll
;
4226 if (new_degraded
!= *degraded
) {
4227 /* check each device to ensure it is still working */
4229 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
4230 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
4232 if (sd
->disk
.state
& (1<<MD_DISK_SYNC
)) {
4235 if (sysfs_get_str(sra
, sd
, "state",
4236 sbuf
, sizeof(sbuf
)) < 0 ||
4237 strstr(sbuf
, "faulty") ||
4238 strstr(sbuf
, "in_sync") == NULL
) {
4239 /* this device is dead */
4240 sd
->disk
.state
= (1<<MD_DISK_FAULTY
);
4241 if (sd
->disk
.raid_disk
>= 0 &&
4242 sources
[sd
->disk
.raid_disk
] >= 0) {
4243 close(sources
[sd
->disk
.raid_disk
]);
4244 sources
[sd
->disk
.raid_disk
] = -1;
4249 *degraded
= new_degraded
;
4252 bsb
.arraystart2
= __cpu_to_le64(offset
* odata
);
4253 bsb
.length2
= __cpu_to_le64(stripes
* (chunk
/512) * odata
);
4255 bsb
.arraystart
= __cpu_to_le64(offset
* odata
);
4256 bsb
.length
= __cpu_to_le64(stripes
* (chunk
/512) * odata
);
4259 bsb
.magic
[15] = '2';
4260 for (i
= 0; i
< dests
; i
++)
4262 lseek64(destfd
[i
], destoffsets
[i
] + __le64_to_cpu(bsb
.devstart2
)*512, 0);
4264 lseek64(destfd
[i
], destoffsets
[i
], 0);
4266 rv
= save_stripes(sources
, offsets
,
4267 disks
, chunk
, level
, layout
,
4269 offset
*512*odata
, stripes
* chunk
* odata
,
4274 bsb
.mtime
= __cpu_to_le64(time(0));
4275 for (i
= 0; i
< dests
; i
++) {
4276 bsb
.devstart
= __cpu_to_le64(destoffsets
[i
]/512);
4278 bsb
.sb_csum
= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
));
4279 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0)
4280 bsb
.sb_csum2
= bsb_csum((char*)&bsb
,
4281 ((char*)&bsb
.sb_csum2
)-((char*)&bsb
));
4284 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
] - 4096, 0)
4285 != destoffsets
[i
] - 4096)
4287 if (write(destfd
[i
], &bsb
, 512) != 512)
4289 if (destoffsets
[i
] > 4096) {
4290 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
]+stripes
*chunk
*odata
, 0) !=
4291 destoffsets
[i
]+stripes
*chunk
*odata
)
4293 if (write(destfd
[i
], &bsb
, 512) != 512)
4303 /* in 2.6.30, the value reported by sync_completed can be
4304 * less that it should be by one stripe.
4305 * This only happens when reshape hits sync_max and pauses.
4306 * So allow wait_backup to either extent sync_max further
4307 * than strictly necessary, or return before the
4308 * sync has got quite as far as we would really like.
4309 * This is what 'blocks2' is for.
4310 * The various caller give appropriate values so that
4313 /* FIXME return value is often ignored */
4314 static int forget_backup(int dests
, int *destfd
,
4315 unsigned long long *destoffsets
,
4319 * Erase backup 'part' (which is 0 or 1)
4325 bsb
.arraystart2
= __cpu_to_le64(0);
4326 bsb
.length2
= __cpu_to_le64(0);
4328 bsb
.arraystart
= __cpu_to_le64(0);
4329 bsb
.length
= __cpu_to_le64(0);
4331 bsb
.mtime
= __cpu_to_le64(time(0));
4333 for (i
= 0; i
< dests
; i
++) {
4334 bsb
.devstart
= __cpu_to_le64(destoffsets
[i
]/512);
4335 bsb
.sb_csum
= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
));
4336 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0)
4337 bsb
.sb_csum2
= bsb_csum((char*)&bsb
,
4338 ((char*)&bsb
.sb_csum2
)-((char*)&bsb
));
4339 if ((unsigned long long)lseek64(destfd
[i
], destoffsets
[i
]-4096, 0) !=
4340 destoffsets
[i
]-4096)
4343 write(destfd
[i
], &bsb
, 512) != 512)
4350 static void fail(char *msg
)
4353 rv
= (write(2, msg
, strlen(msg
)) != (int)strlen(msg
));
4354 rv
|= (write(2, "\n", 1) != 1);
4358 static char *abuf
, *bbuf
;
4359 static unsigned long long abuflen
;
4360 static void validate(int afd
, int bfd
, unsigned long long offset
)
4362 /* check that the data in the backup against the array.
4363 * This is only used for regression testing and should not
4364 * be used while the array is active
4368 lseek64(bfd
, offset
- 4096, 0);
4369 if (read(bfd
, &bsb2
, 512) != 512)
4370 fail("cannot read bsb");
4371 if (bsb2
.sb_csum
!= bsb_csum((char*)&bsb2
,
4372 ((char*)&bsb2
.sb_csum
)-((char*)&bsb2
)))
4373 fail("first csum bad");
4374 if (memcmp(bsb2
.magic
, "md_backup_data", 14) != 0)
4375 fail("magic is bad");
4376 if (memcmp(bsb2
.magic
, "md_backup_data-2", 16) == 0 &&
4377 bsb2
.sb_csum2
!= bsb_csum((char*)&bsb2
,
4378 ((char*)&bsb2
.sb_csum2
)-((char*)&bsb2
)))
4379 fail("second csum bad");
4381 if (__le64_to_cpu(bsb2
.devstart
)*512 != offset
)
4382 fail("devstart is wrong");
4385 unsigned long long len
= __le64_to_cpu(bsb2
.length
)*512;
4387 if (abuflen
< len
) {
4391 if (posix_memalign((void**)&abuf
, 4096, abuflen
) ||
4392 posix_memalign((void**)&bbuf
, 4096, abuflen
)) {
4394 /* just stop validating on mem-alloc failure */
4399 lseek64(bfd
, offset
, 0);
4400 if ((unsigned long long)read(bfd
, bbuf
, len
) != len
) {
4401 //printf("len %llu\n", len);
4402 fail("read first backup failed");
4404 lseek64(afd
, __le64_to_cpu(bsb2
.arraystart
)*512, 0);
4405 if ((unsigned long long)read(afd
, abuf
, len
) != len
)
4406 fail("read first from array failed");
4407 if (memcmp(bbuf
, abuf
, len
) != 0) {
4410 printf("offset=%llu len=%llu\n",
4411 (unsigned long long)__le64_to_cpu(bsb2
.arraystart
)*512, len
);
4412 for (i
=0; i
<len
; i
++)
4413 if (bbuf
[i
] != abuf
[i
]) {
4414 printf("first diff byte %d\n", i
);
4418 fail("data1 compare failed");
4422 unsigned long long len
= __le64_to_cpu(bsb2
.length2
)*512;
4424 if (abuflen
< len
) {
4428 abuf
= xmalloc(abuflen
);
4429 bbuf
= xmalloc(abuflen
);
4432 lseek64(bfd
, offset
+__le64_to_cpu(bsb2
.devstart2
)*512, 0);
4433 if ((unsigned long long)read(bfd
, bbuf
, len
) != len
)
4434 fail("read second backup failed");
4435 lseek64(afd
, __le64_to_cpu(bsb2
.arraystart2
)*512, 0);
4436 if ((unsigned long long)read(afd
, abuf
, len
) != len
)
4437 fail("read second from array failed");
4438 if (memcmp(bbuf
, abuf
, len
) != 0)
4439 fail("data2 compare failed");
4443 int child_monitor(int afd
, struct mdinfo
*sra
, struct reshape
*reshape
,
4444 struct supertype
*st
, unsigned long blocks
,
4445 int *fds
, unsigned long long *offsets
,
4446 int dests
, int *destfd
, unsigned long long *destoffsets
)
4448 /* Monitor a reshape where backup is being performed using
4449 * 'native' mechanism - either to a backup file, or
4450 * to some space in a spare.
4454 unsigned long long speed
;
4455 unsigned long long suspend_point
, array_size
;
4456 unsigned long long backup_point
, wait_point
;
4457 unsigned long long reshape_completed
;
4459 int increasing
= reshape
->after
.data_disks
>= reshape
->before
.data_disks
;
4460 int part
= 0; /* The next part of the backup area to fill. It may already
4461 * be full, so we need to check */
4462 int level
= reshape
->level
;
4463 int layout
= reshape
->before
.layout
;
4464 int data
= reshape
->before
.data_disks
;
4465 int disks
= reshape
->before
.data_disks
+ reshape
->parity
;
4466 int chunk
= sra
->array
.chunk_size
;
4468 unsigned long stripes
;
4472 /* set up the backup-super-block. This requires the
4473 * uuid from the array.
4475 /* Find a superblock */
4476 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
4480 if (sd
->disk
.state
& (1<<MD_DISK_FAULTY
))
4482 dn
= map_dev(sd
->disk
.major
, sd
->disk
.minor
, 1);
4483 devfd
= dev_open(dn
, O_RDONLY
);
4486 ok
= st
->ss
->load_super(st
, devfd
, NULL
);
4492 pr_err("Cannot find a superblock\n");
4496 memset(&bsb
, 0, 512);
4497 memcpy(bsb
.magic
, "md_backup_data-1", 16);
4498 st
->ss
->uuid_from_super(st
, uuid
);
4499 memcpy(bsb
.set_uuid
, uuid
, 16);
4500 bsb
.mtime
= __cpu_to_le64(time(0));
4501 bsb
.devstart2
= blocks
;
4503 stripes
= blocks
/ (sra
->array
.chunk_size
/512) /
4504 reshape
->before
.data_disks
;
4506 if (posix_memalign((void**)&buf
, 4096, disks
* chunk
))
4507 /* Don't start the 'reshape' */
4509 if (reshape
->before
.data_disks
== reshape
->after
.data_disks
) {
4510 sysfs_get_ll(sra
, NULL
, "sync_speed_min", &speed
);
4511 sysfs_set_num(sra
, NULL
, "sync_speed_min", 200000);
4515 array_size
= sra
->component_size
* reshape
->after
.data_disks
;
4516 backup_point
= sra
->reshape_progress
;
4519 array_size
= sra
->component_size
* reshape
->before
.data_disks
;
4520 backup_point
= reshape
->backup_blocks
;
4521 suspend_point
= array_size
;
4527 /* Want to return as soon the oldest backup slot can
4528 * be released as that allows us to start backing up
4529 * some more, providing suspend_point has been
4530 * advanced, which it should have.
4533 wait_point
= array_size
;
4534 if (part
== 0 && __le64_to_cpu(bsb
.length
) > 0)
4535 wait_point
= (__le64_to_cpu(bsb
.arraystart
) +
4536 __le64_to_cpu(bsb
.length
));
4537 if (part
== 1 && __le64_to_cpu(bsb
.length2
) > 0)
4538 wait_point
= (__le64_to_cpu(bsb
.arraystart2
) +
4539 __le64_to_cpu(bsb
.length2
));
4542 if (part
== 0 && __le64_to_cpu(bsb
.length
) > 0)
4543 wait_point
= __le64_to_cpu(bsb
.arraystart
);
4544 if (part
== 1 && __le64_to_cpu(bsb
.length2
) > 0)
4545 wait_point
= __le64_to_cpu(bsb
.arraystart2
);
4548 reshape_completed
= sra
->reshape_progress
;
4549 rv
= progress_reshape(sra
, reshape
,
4550 backup_point
, wait_point
,
4551 &suspend_point
, &reshape_completed
,
4553 /* external metadata would need to ping_monitor here */
4554 sra
->reshape_progress
= reshape_completed
;
4556 /* Clear any backup region that is before 'here' */
4558 if (__le64_to_cpu(bsb
.length
) > 0 &&
4559 reshape_completed
>= (__le64_to_cpu(bsb
.arraystart
) +
4560 __le64_to_cpu(bsb
.length
)))
4561 forget_backup(dests
, destfd
,
4563 if (__le64_to_cpu(bsb
.length2
) > 0 &&
4564 reshape_completed
>= (__le64_to_cpu(bsb
.arraystart2
) +
4565 __le64_to_cpu(bsb
.length2
)))
4566 forget_backup(dests
, destfd
,
4569 if (__le64_to_cpu(bsb
.length
) > 0 &&
4570 reshape_completed
<= (__le64_to_cpu(bsb
.arraystart
)))
4571 forget_backup(dests
, destfd
,
4573 if (__le64_to_cpu(bsb
.length2
) > 0 &&
4574 reshape_completed
<= (__le64_to_cpu(bsb
.arraystart2
)))
4575 forget_backup(dests
, destfd
,
4585 if (rv
== 0 && increasing
&& !st
->ss
->external
) {
4586 /* No longer need to monitor this reshape */
4587 sysfs_set_str(sra
, NULL
, "sync_max", "max");
4593 unsigned long long offset
;
4594 unsigned long actual_stripes
;
4595 /* Need to backup some data.
4596 * If 'part' is not used and the desired
4597 * backup size is suspended, do a backup,
4598 * then consider the next part.
4600 /* Check that 'part' is unused */
4601 if (part
== 0 && __le64_to_cpu(bsb
.length
) != 0)
4603 if (part
== 1 && __le64_to_cpu(bsb
.length2
) != 0)
4606 offset
= backup_point
/ data
;
4607 actual_stripes
= stripes
;
4609 if (offset
+ actual_stripes
* (chunk
/512) >
4610 sra
->component_size
)
4611 actual_stripes
= ((sra
->component_size
- offset
)
4613 if (offset
+ actual_stripes
* (chunk
/512) >
4617 if (offset
< actual_stripes
* (chunk
/512))
4618 actual_stripes
= offset
/ (chunk
/512);
4619 offset
-= actual_stripes
* (chunk
/512);
4620 if (offset
< suspend_point
/data
)
4623 if (actual_stripes
== 0)
4625 grow_backup(sra
, offset
, actual_stripes
,
4627 disks
, chunk
, level
, layout
,
4628 dests
, destfd
, destoffsets
,
4629 part
, °raded
, buf
);
4630 validate(afd
, destfd
[0], destoffsets
[0]);
4631 /* record where 'part' is up to */
4634 backup_point
+= actual_stripes
* (chunk
/512) * data
;
4636 backup_point
-= actual_stripes
* (chunk
/512) * data
;
4640 /* FIXME maybe call progress_reshape one more time instead */
4641 /* remove any remaining suspension */
4642 sysfs_set_num(sra
, NULL
, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL
);
4643 sysfs_set_num(sra
, NULL
, "suspend_hi", 0);
4644 sysfs_set_num(sra
, NULL
, "suspend_lo", 0);
4645 sysfs_set_num(sra
, NULL
, "sync_min", 0);
4647 if (reshape
->before
.data_disks
== reshape
->after
.data_disks
)
4648 sysfs_set_num(sra
, NULL
, "sync_speed_min", speed
);
4654 * If any spare contains md_back_data-1 which is recent wrt mtime,
4655 * write that data into the array and update the super blocks with
4656 * the new reshape_progress
4658 int Grow_restart(struct supertype
*st
, struct mdinfo
*info
, int *fdlist
, int cnt
,
4659 char *backup_file
, int verbose
)
4663 unsigned long long *offsets
;
4664 unsigned long long nstripe
, ostripe
;
4667 odata
= info
->array
.raid_disks
- info
->delta_disks
- 1;
4668 if (info
->array
.level
== 6) odata
--; /* number of data disks */
4669 ndata
= info
->array
.raid_disks
- 1;
4670 if (info
->new_level
== 6) ndata
--;
4672 old_disks
= info
->array
.raid_disks
- info
->delta_disks
;
4674 if (info
->delta_disks
<= 0)
4675 /* Didn't grow, so the backup file must have
4679 for (i
=old_disks
-(backup_file
?1:0); i
<cnt
; i
++) {
4680 struct mdinfo dinfo
;
4683 char *devname
, namebuf
[20];
4684 unsigned long long lo
, hi
;
4686 /* This was a spare and may have some saved data on it.
4687 * Load the superblock, find and load the
4688 * backup_super_block.
4689 * If either fail, go on to next device.
4690 * If the backup contains no new info, just return
4691 * else restore data and update all superblocks
4693 if (i
== old_disks
-1) {
4694 fd
= open(backup_file
, O_RDONLY
);
4696 pr_err("backup file %s inaccessible: %s\n",
4697 backup_file
, strerror(errno
));
4700 devname
= backup_file
;
4705 if (st
->ss
->load_super(st
, fd
, NULL
))
4708 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
4709 st
->ss
->free_super(st
);
4712 (dinfo
.data_offset
+ dinfo
.component_size
- 8) <<9,
4714 pr_err("Cannot seek on device %d\n", i
);
4715 continue; /* Cannot seek */
4717 sprintf(namebuf
, "device-%d", i
);
4720 if (read(fd
, &bsb
, sizeof(bsb
)) != sizeof(bsb
)) {
4722 pr_err("Cannot read from %s\n", devname
);
4723 continue; /* Cannot read */
4725 if (memcmp(bsb
.magic
, "md_backup_data-1", 16) != 0 &&
4726 memcmp(bsb
.magic
, "md_backup_data-2", 16) != 0) {
4728 pr_err("No backup metadata on %s\n", devname
);
4731 if (bsb
.sb_csum
!= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum
)-((char*)&bsb
))) {
4733 pr_err("Bad backup-metadata checksum on %s\n", devname
);
4734 continue; /* bad checksum */
4736 if (memcmp(bsb
.magic
, "md_backup_data-2", 16) == 0 &&
4737 bsb
.sb_csum2
!= bsb_csum((char*)&bsb
, ((char*)&bsb
.sb_csum2
)-((char*)&bsb
))) {
4739 pr_err("Bad backup-metadata checksum2 on %s\n", devname
);
4740 continue; /* Bad second checksum */
4742 if (memcmp(bsb
.set_uuid
,info
->uuid
, 16) != 0) {
4744 pr_err("Wrong uuid on backup-metadata on %s\n", devname
);
4745 continue; /* Wrong uuid */
4748 /* array utime and backup-mtime should be updated at much the same time, but it seems that
4749 * sometimes they aren't... So allow considerable flexability in matching, and allow
4750 * this test to be overridden by an environment variable.
4752 if(time_after(info
->array
.utime
, (unsigned int)__le64_to_cpu(bsb
.mtime
) + 2*60*60) ||
4753 time_before(info
->array
.utime
, (unsigned int)__le64_to_cpu(bsb
.mtime
) - 10*60)) {
4754 if (check_env("MDADM_GROW_ALLOW_OLD")) {
4755 pr_err("accepting backup with timestamp %lu for array with timestamp %lu\n",
4756 (unsigned long)__le64_to_cpu(bsb
.mtime
),
4757 (unsigned long)info
->array
.utime
);
4759 pr_err("too-old timestamp on backup-metadata on %s\n", devname
);
4760 pr_err("If you think it is should be safe, try 'export MDADM_GROW_ALLOW_OLD=1'\n");
4761 continue; /* time stamp is too bad */
4765 if (bsb
.magic
[15] == '1') {
4766 if (bsb
.length
== 0)
4768 if (info
->delta_disks
>= 0) {
4769 /* reshape_progress is increasing */
4770 if (__le64_to_cpu(bsb
.arraystart
)
4771 + __le64_to_cpu(bsb
.length
)
4772 < info
->reshape_progress
) {
4775 pr_err("backup-metadata found on %s but is not needed\n", devname
);
4776 continue; /* No new data here */
4779 /* reshape_progress is decreasing */
4780 if (__le64_to_cpu(bsb
.arraystart
) >=
4781 info
->reshape_progress
)
4782 goto nonew
; /* No new data here */
4785 if (bsb
.length
== 0 && bsb
.length2
== 0)
4787 if (info
->delta_disks
>= 0) {
4788 /* reshape_progress is increasing */
4789 if ((__le64_to_cpu(bsb
.arraystart
)
4790 + __le64_to_cpu(bsb
.length
)
4791 < info
->reshape_progress
)
4793 (__le64_to_cpu(bsb
.arraystart2
)
4794 + __le64_to_cpu(bsb
.length2
)
4795 < info
->reshape_progress
))
4796 goto nonew
; /* No new data here */
4798 /* reshape_progress is decreasing */
4799 if (__le64_to_cpu(bsb
.arraystart
) >=
4800 info
->reshape_progress
&&
4801 __le64_to_cpu(bsb
.arraystart2
) >=
4802 info
->reshape_progress
)
4803 goto nonew
; /* No new data here */
4806 if (lseek64(fd
, __le64_to_cpu(bsb
.devstart
)*512, 0)< 0) {
4809 pr_err("Failed to verify secondary backup-metadata block on %s\n",
4811 continue; /* Cannot seek */
4813 /* There should be a duplicate backup superblock 4k before here */
4814 if (lseek64(fd
, -4096, 1) < 0 ||
4815 read(fd
, &bsb2
, sizeof(bsb2
)) != sizeof(bsb2
))
4816 goto second_fail
; /* Cannot find leading superblock */
4817 if (bsb
.magic
[15] == '1')
4818 bsbsize
= offsetof(struct mdp_backup_super
, pad1
);
4820 bsbsize
= offsetof(struct mdp_backup_super
, pad
);
4821 if (memcmp(&bsb2
, &bsb
, bsbsize
) != 0)
4822 goto second_fail
; /* Cannot find leading superblock */
4824 /* Now need the data offsets for all devices. */
4825 offsets
= xmalloc(sizeof(*offsets
)*info
->array
.raid_disks
);
4826 for(j
=0; j
<info
->array
.raid_disks
; j
++) {
4829 if (st
->ss
->load_super(st
, fdlist
[j
], NULL
))
4830 /* FIXME should be this be an error */
4832 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
4833 st
->ss
->free_super(st
);
4834 offsets
[j
] = dinfo
.data_offset
* 512;
4836 printf("%s: restoring critical section\n", Name
);
4838 if (restore_stripes(fdlist
, offsets
,
4839 info
->array
.raid_disks
,
4843 fd
, __le64_to_cpu(bsb
.devstart
)*512,
4844 __le64_to_cpu(bsb
.arraystart
)*512,
4845 __le64_to_cpu(bsb
.length
)*512, NULL
)) {
4846 /* didn't succeed, so giveup */
4848 pr_err("Error restoring backup from %s\n",
4854 if (bsb
.magic
[15] == '2' &&
4855 restore_stripes(fdlist
, offsets
,
4856 info
->array
.raid_disks
,
4860 fd
, __le64_to_cpu(bsb
.devstart
)*512 +
4861 __le64_to_cpu(bsb
.devstart2
)*512,
4862 __le64_to_cpu(bsb
.arraystart2
)*512,
4863 __le64_to_cpu(bsb
.length2
)*512, NULL
)) {
4864 /* didn't succeed, so giveup */
4866 pr_err("Error restoring second backup from %s\n",
4874 /* Ok, so the data is restored. Let's update those superblocks. */
4878 lo
= __le64_to_cpu(bsb
.arraystart
);
4879 hi
= lo
+ __le64_to_cpu(bsb
.length
);
4881 if (bsb
.magic
[15] == '2' && bsb
.length2
) {
4882 unsigned long long lo1
, hi1
;
4883 lo1
= __le64_to_cpu(bsb
.arraystart2
);
4884 hi1
= lo1
+ __le64_to_cpu(bsb
.length2
);
4888 } else if (lo
< lo1
)
4894 (info
->reshape_progress
< lo
||
4895 info
->reshape_progress
> hi
))
4896 /* backup does not affect reshape_progress*/ ;
4897 else if (info
->delta_disks
>= 0) {
4898 info
->reshape_progress
= __le64_to_cpu(bsb
.arraystart
) +
4899 __le64_to_cpu(bsb
.length
);
4900 if (bsb
.magic
[15] == '2') {
4901 unsigned long long p2
= __le64_to_cpu(bsb
.arraystart2
) +
4902 __le64_to_cpu(bsb
.length2
);
4903 if (p2
> info
->reshape_progress
)
4904 info
->reshape_progress
= p2
;
4907 info
->reshape_progress
= __le64_to_cpu(bsb
.arraystart
);
4908 if (bsb
.magic
[15] == '2') {
4909 unsigned long long p2
= __le64_to_cpu(bsb
.arraystart2
);
4910 if (p2
< info
->reshape_progress
)
4911 info
->reshape_progress
= p2
;
4914 for (j
=0; j
<info
->array
.raid_disks
; j
++) {
4917 if (st
->ss
->load_super(st
, fdlist
[j
], NULL
))
4919 st
->ss
->getinfo_super(st
, &dinfo
, NULL
);
4920 dinfo
.reshape_progress
= info
->reshape_progress
;
4921 st
->ss
->update_super(st
, &dinfo
,
4922 "_reshape_progress",
4924 st
->ss
->store_super(st
, fdlist
[j
]);
4925 st
->ss
->free_super(st
);
4929 /* Didn't find any backup data, try to see if any
4932 if (info
->delta_disks
< 0) {
4933 /* When shrinking, the critical section is at the end.
4934 * So see if we are before the critical section.
4936 unsigned long long first_block
;
4937 nstripe
= ostripe
= 0;
4939 while (ostripe
>= nstripe
) {
4940 ostripe
+= info
->array
.chunk_size
/ 512;
4941 first_block
= ostripe
* odata
;
4942 nstripe
= first_block
/ ndata
/ (info
->new_chunk
/512) *
4943 (info
->new_chunk
/512);
4946 if (info
->reshape_progress
>= first_block
)
4949 if (info
->delta_disks
> 0) {
4950 /* See if we are beyond the critical section. */
4951 unsigned long long last_block
;
4952 nstripe
= ostripe
= 0;
4954 while (nstripe
>= ostripe
) {
4955 nstripe
+= info
->new_chunk
/ 512;
4956 last_block
= nstripe
* ndata
;
4957 ostripe
= last_block
/ odata
/ (info
->array
.chunk_size
/512) *
4958 (info
->array
.chunk_size
/512);
4961 if (info
->reshape_progress
>= last_block
)
4964 /* needed to recover critical section! */
4966 pr_err("Failed to find backup of critical section\n");
4970 int Grow_continue_command(char *devname
, int fd
,
4971 char *backup_file
, int verbose
)
4974 struct supertype
*st
= NULL
;
4975 struct mdinfo
*content
= NULL
;
4976 struct mdinfo array
;
4977 char *subarray
= NULL
;
4978 struct mdinfo
*cc
= NULL
;
4979 struct mdstat_ent
*mdstat
= NULL
;
4983 dprintf("Grow continue from command line called for %s\n",
4986 st
= super_by_fd(fd
, &subarray
);
4987 if (!st
|| !st
->ss
) {
4988 pr_err("Unable to determine metadata format for %s\n",
4992 dprintf("Grow continue is run for ");
4993 if (st
->ss
->external
== 0) {
4996 dprintf_cont("native array (%s)\n", devname
);
4997 if (md_get_array_info(fd
, &array
.array
) < 0) {
4998 pr_err("%s is not an active md array - aborting\n",
5001 goto Grow_continue_command_exit
;
5004 /* Need to load a superblock.
5005 * FIXME we should really get what we need from
5009 for (d
= 0; d
< MAX_DISKS
; d
++) {
5010 mdu_disk_info_t disk
;
5014 if (ioctl(fd
, GET_DISK_INFO
, &disk
) < 0)
5016 if (disk
.major
== 0 && disk
.minor
== 0)
5018 if ((disk
.state
& (1 << MD_DISK_ACTIVE
)) == 0)
5020 dv
= map_dev(disk
.major
, disk
.minor
, 1);
5023 fd2
= dev_open(dv
, O_RDONLY
);
5026 err
= st
->ss
->load_super(st
, fd2
, NULL
);
5032 if (d
== MAX_DISKS
) {
5033 pr_err("Unable to load metadata for %s\n",
5036 goto Grow_continue_command_exit
;
5038 st
->ss
->getinfo_super(st
, content
, NULL
);
5039 if (!content
->reshape_active
)
5043 } while (cnt
-- > 0);
5048 dprintf_cont("subarray (%s)\n", subarray
);
5049 container
= st
->container_devnm
;
5050 cfd
= open_dev_excl(st
->container_devnm
);
5052 container
= st
->devnm
;
5054 cfd
= open_dev_excl(st
->devnm
);
5055 dprintf_cont("container (%s)\n", container
);
5059 pr_err("Unable to open container for %s\n", devname
);
5061 goto Grow_continue_command_exit
;
5064 /* find in container array under reshape
5066 ret_val
= st
->ss
->load_container(st
, cfd
, NULL
);
5068 pr_err("Cannot read superblock for %s\n",
5071 goto Grow_continue_command_exit
;
5074 cc
= st
->ss
->container_content(st
, subarray
);
5075 for (content
= cc
; content
; content
= content
->next
) {
5077 int allow_reshape
= 1;
5079 if (content
->reshape_active
== 0)
5081 /* The decision about array or container wide
5082 * reshape is taken in Grow_continue based
5083 * content->reshape_active state, therefore we
5084 * need to check_reshape based on
5085 * reshape_active and subarray name
5087 if (content
->array
.state
& (1<<MD_SB_BLOCK_VOLUME
))
5089 if (content
->reshape_active
== CONTAINER_RESHAPE
&&
5090 (content
->array
.state
5091 & (1<<MD_SB_BLOCK_CONTAINER_RESHAPE
)))
5094 if (!allow_reshape
) {
5095 pr_err("cannot continue reshape of an array in container with unsupported metadata: %s(%s)\n",
5096 devname
, container
);
5098 goto Grow_continue_command_exit
;
5101 array
= strchr(content
->text_version
+1, '/')+1;
5102 mdstat
= mdstat_by_subdev(array
, container
);
5105 if (mdstat
->active
== 0) {
5106 pr_err("Skipping inactive array %s.\n",
5108 free_mdstat(mdstat
);
5115 pr_err("Unable to determine reshaped array for %s\n", devname
);
5117 goto Grow_continue_command_exit
;
5119 fd2
= open_dev(mdstat
->devnm
);
5121 pr_err("cannot open (%s)\n", mdstat
->devnm
);
5123 goto Grow_continue_command_exit
;
5126 sysfs_init(content
, fd2
, mdstat
->devnm
);
5130 /* start mdmon in case it is not running
5132 if (!mdmon_running(container
))
5133 start_mdmon(container
);
5134 ping_monitor(container
);
5136 if (mdmon_running(container
))
5137 st
->update_tail
= &st
->updates
;
5139 pr_err("No mdmon found. Grow cannot continue.\n");
5141 goto Grow_continue_command_exit
;
5145 /* verify that array under reshape is started from
5148 if (verify_reshape_position(content
, content
->array
.level
) < 0) {
5150 goto Grow_continue_command_exit
;
5155 ret_val
= Grow_continue(fd
, st
, content
, backup_file
, 1, 0);
5157 Grow_continue_command_exit
:
5160 st
->ss
->free_super(st
);
5161 free_mdstat(mdstat
);
5168 int Grow_continue(int mdfd
, struct supertype
*st
, struct mdinfo
*info
,
5169 char *backup_file
, int forked
, int freeze_reshape
)
5173 if (!info
->reshape_active
)
5176 if (st
->ss
->external
) {
5177 int cfd
= open_dev(st
->container_devnm
);
5182 st
->ss
->load_container(st
, cfd
, st
->container_devnm
);
5184 ret_val
= reshape_container(st
->container_devnm
, NULL
, mdfd
,
5185 st
, info
, 0, backup_file
,
5187 1 | info
->reshape_active
,
5190 ret_val
= reshape_array(NULL
, mdfd
, "array", st
, info
, 1,
5191 NULL
, INVALID_SECTORS
,
5192 backup_file
, 0, forked
,
5193 1 | info
->reshape_active
,
5199 char *make_backup(char *name
)
5201 char *base
= "backup_file-";
5205 len
= strlen(MAP_DIR
) + 1 + strlen(base
) + strlen(name
)+1;
5206 fname
= xmalloc(len
);
5207 sprintf(fname
, "%s/%s%s", MAP_DIR
, base
, name
);
5211 char *locate_backup(char *name
)
5213 char *fl
= make_backup(name
);
5216 if (stat(fl
, &stb
) == 0 &&
5217 S_ISREG(stb
.st_mode
))