2 * mdadm - manage Linux "md" devices aka RAID arrays.
4 * Copyright (C) 2001-2013 Neil Brown <neilb@suse.de>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * Email: <neilb@suse.de>
32 #if ! defined(__BIG_ENDIAN) && ! defined(__LITTLE_ENDIAN)
33 #error no endian defined
38 int restore_backup(struct supertype *st,
39 struct mdinfo *content,
49 int disk_count = next_spare + working_disks;
50 char *backup_file = *backup_filep;
52 dprintf("Called restore_backup()\n");
53 fdlist = xmalloc(sizeof(int) * disk_count);
55 enable_fds(next_spare);
56 for (i = 0; i < next_spare; i++)
58 for (dev = content->devs; dev; dev = dev->next) {
64 fd = dev_open(buf, O_RDWR);
66 if (dev->disk.raid_disk >= 0)
67 fdlist[dev->disk.raid_disk] = fd;
69 fdlist[next_spare++] = fd;
73 backup_file = locate_backup(content->sys_name);
74 *backup_filep = backup_file;
77 if (st->ss->external && st->ss->recover_backup)
78 err = st->ss->recover_backup(st, content);
80 err = Grow_restart(st, content, fdlist, next_spare,
81 backup_file, verbose > 0);
83 while (next_spare > 0) {
85 if (fdlist[next_spare] >= 0)
86 close(fdlist[next_spare]);
90 pr_err("Failed to restore critical section for reshape - sorry.\n");
92 pr_err("Possibly you need to specify a --backup-file\n");
96 dprintf("restore_backup() returns status OK.\n");
100 int Grow_Add_device(char *devname, int fd, char *newdev)
102 /* Add a device to an active array.
103 * Currently, just extend a linear array.
104 * This requires writing a new superblock on the
105 * new device, calling the kernel to add the device,
106 * and if that succeeds, update the superblock on
108 * This means that we need to *find* all other devices.
115 struct supertype *st = NULL;
116 char *subarray = NULL;
118 if (ioctl(fd, GET_ARRAY_INFO, &info.array) < 0) {
119 pr_err("cannot get array info for %s\n", devname);
123 if (info.array.level != -1) {
124 pr_err("can only add devices to linear arrays\n");
128 st = super_by_fd(fd, &subarray);
130 pr_err("cannot handle arrays with superblock version %d\n",
131 info.array.major_version);
136 pr_err("Cannot grow linear sub-arrays yet\n");
142 nfd = open(newdev, O_RDWR|O_EXCL|O_DIRECT);
144 pr_err("cannot open %s\n", newdev);
149 if ((stb.st_mode & S_IFMT) != S_IFBLK) {
150 pr_err("%s is not a block device!\n", newdev);
155 /* now check out all the devices and make sure we can read the
157 for (d=0 ; d < info.array.raid_disks ; d++) {
158 mdu_disk_info_t disk;
161 st->ss->free_super(st);
164 if (ioctl(fd, GET_DISK_INFO, &disk) < 0) {
165 pr_err("cannot get device detail for device %d\n",
171 dv = map_dev(disk.major, disk.minor, 1);
173 pr_err("cannot find device file for device %d\n",
179 fd2 = dev_open(dv, O_RDWR);
181 pr_err("cannot open device file %s\n", dv);
187 if (st->ss->load_super(st, fd2, NULL)) {
188 pr_err("cannot find super block on %s\n", dv);
196 /* Ok, looks good. Lets update the superblock and write it out to
200 info.disk.number = d;
201 info.disk.major = major(stb.st_rdev);
202 info.disk.minor = minor(stb.st_rdev);
203 info.disk.raid_disk = d;
204 info.disk.state = (1 << MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE);
205 st->ss->update_super(st, &info, "linear-grow-new", newdev,
208 if (st->ss->store_super(st, nfd)) {
209 pr_err("Cannot store new superblock on %s\n",
216 if (ioctl(fd, ADD_NEW_DISK, &info.disk) != 0) {
217 pr_err("Cannot add new disk to this array\n");
220 /* Well, that seems to have worked.
221 * Now go through and update all superblocks
224 if (ioctl(fd, GET_ARRAY_INFO, &info.array) < 0) {
225 pr_err("cannot get array info for %s\n", devname);
230 for (d=0 ; d < info.array.raid_disks ; d++) {
231 mdu_disk_info_t disk;
235 if (ioctl(fd, GET_DISK_INFO, &disk) < 0) {
236 pr_err("cannot get device detail for device %d\n",
240 dv = map_dev(disk.major, disk.minor, 1);
242 pr_err("cannot find device file for device %d\n",
246 fd2 = dev_open(dv, O_RDWR);
248 pr_err("cannot open device file %s\n", dv);
251 if (st->ss->load_super(st, fd2, NULL)) {
252 pr_err("cannot find super block on %s\n", dv);
256 info.array.raid_disks = nd+1;
257 info.array.nr_disks = nd+1;
258 info.array.active_disks = nd+1;
259 info.array.working_disks = nd+1;
261 st->ss->update_super(st, &info, "linear-grow-update", dv,
264 if (st->ss->store_super(st, fd2)) {
265 pr_err("Cannot store new superblock on %s\n", dv);
275 int Grow_addbitmap(char *devname, int fd, struct context *c, struct shape *s)
278 * First check that array doesn't have a bitmap
279 * Then create the bitmap
282 * For internal bitmaps, we need to check the version,
283 * find all the active devices, and write the bitmap block
286 mdu_bitmap_file_t bmf;
287 mdu_array_info_t array;
288 struct supertype *st;
289 char *subarray = NULL;
290 int major = BITMAP_MAJOR_HI;
291 int vers = md_get_version(fd);
292 unsigned long long bitmapsize, array_size;
295 major = BITMAP_MAJOR_HOSTENDIAN;
296 pr_err("Warning - bitmaps created on this kernel are not portable\n"
297 " between different architectures. Consider upgrading the Linux kernel.\n");
301 * We only ever get called if s->bitmap_file is != NULL, so this check
302 * is just here to quiet down static code checkers.
307 if (strcmp(s->bitmap_file, "clustered") == 0)
308 major = BITMAP_MAJOR_CLUSTERED;
310 if (ioctl(fd, GET_BITMAP_FILE, &bmf) != 0) {
312 pr_err("Memory allocation failure.\n");
314 pr_err("bitmaps not supported by this kernel.\n");
317 if (bmf.pathname[0]) {
318 if (strcmp(s->bitmap_file,"none") == 0) {
319 if (ioctl(fd, SET_BITMAP_FILE, -1) != 0) {
320 pr_err("failed to remove bitmap %s\n",
326 pr_err("%s already has a bitmap (%s)\n",
327 devname, bmf.pathname);
330 if (ioctl(fd, GET_ARRAY_INFO, &array) != 0) {
331 pr_err("cannot get array status for %s\n", devname);
334 if (array.state & (1 << MD_SB_BITMAP_PRESENT)) {
335 if (strcmp(s->bitmap_file, "none")==0) {
336 array.state &= ~(1 << MD_SB_BITMAP_PRESENT);
337 if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
338 if (array.state & (1 << MD_SB_CLUSTERED))
339 pr_err("failed to remove clustered bitmap.\n");
341 pr_err("failed to remove internal bitmap.\n");
346 pr_err("bitmap already present on %s\n", devname);
350 if (strcmp(s->bitmap_file, "none") == 0) {
351 pr_err("no bitmap found on %s\n", devname);
354 if (array.level <= 0) {
355 pr_err("Bitmaps not meaningful with level %s\n",
356 map_num(pers, array.level)?:"of this array");
359 bitmapsize = array.size;
361 if (get_dev_size(fd, NULL, &array_size) &&
362 array_size > (0x7fffffffULL << 9)) {
363 /* Array is big enough that we cannot trust array.size
364 * try other approaches
366 bitmapsize = get_component_size(fd);
368 if (bitmapsize == 0) {
369 pr_err("Cannot reliably determine size of array to create bitmap - sorry.\n");
373 if (array.level == 10) {
376 ncopies = (array.layout & 255) * ((array.layout >> 8) & 255);
377 bitmapsize = bitmapsize * array.raid_disks / ncopies;
380 st = super_by_fd(fd, &subarray);
382 pr_err("Cannot understand version %d.%d\n",
383 array.major_version, array.minor_version);
387 pr_err("Cannot add bitmaps to sub-arrays yet\n");
392 if (strcmp(s->bitmap_file, "internal") == 0 ||
393 strcmp(s->bitmap_file, "clustered") == 0) {
396 int offset_setable = 0;
398 if (st->ss->add_internal_bitmap == NULL) {
399 pr_err("Internal bitmaps not supported with %s metadata\n", st->ss->name);
402 st->nodes = c->nodes;
403 st->cluster_name = c->homecluster;
404 mdi = sysfs_read(fd, NULL, GET_BITMAP_LOCATION);
407 for (d = 0; d < st->max_devs; d++) {
408 mdu_disk_info_t disk;
413 if (ioctl(fd, GET_DISK_INFO, &disk) < 0)
415 if (disk.major == 0 && disk.minor == 0)
417 if ((disk.state & (1 << MD_DISK_SYNC)) == 0)
419 dv = map_dev(disk.major, disk.minor, 1);
422 fd2 = dev_open(dv, O_RDWR);
425 rv = st->ss->load_super(st, fd2, NULL);
427 rv = st->ss->add_internal_bitmap(
428 st, &s->bitmap_chunk, c->delay,
429 s->write_behind, bitmapsize,
430 offset_setable, major);
432 st->ss->write_bitmap(st, fd2,
435 pr_err("failed to create internal bitmap - chunksize problem.\n");
438 pr_err("failed to load super-block.\n");
444 if (offset_setable) {
445 st->ss->getinfo_super(st, mdi, NULL);
446 sysfs_init(mdi, fd, NULL);
447 rv = sysfs_set_num_signed(mdi, NULL, "bitmap/location",
450 if (strcmp(s->bitmap_file, "clustered") == 0)
451 array.state |= (1 << MD_SB_CLUSTERED);
452 array.state |= (1 << MD_SB_BITMAP_PRESENT);
453 rv = ioctl(fd, SET_ARRAY_INFO, &array);
457 pr_err("Cannot add bitmap while array is resyncing or reshaping etc.\n");
458 pr_err("failed to set internal bitmap.\n");
465 int max_devs = st->max_devs;
467 /* try to load a superblock */
468 for (d = 0; d < max_devs; d++) {
469 mdu_disk_info_t disk;
473 if (ioctl(fd, GET_DISK_INFO, &disk) < 0)
475 if ((disk.major==0 && disk.minor == 0) ||
476 (disk.state & (1 << MD_DISK_REMOVED)))
478 dv = map_dev(disk.major, disk.minor, 1);
481 fd2 = dev_open(dv, O_RDONLY);
483 if (st->ss->load_super(st, fd2, NULL) == 0) {
485 st->ss->uuid_from_super(st, uuid);
492 pr_err("cannot find UUID for array!\n");
495 if (CreateBitmap(s->bitmap_file, c->force, (char*)uuid,
496 s->bitmap_chunk, c->delay, s->write_behind,
497 bitmapsize, major)) {
500 bitmap_fd = open(s->bitmap_file, O_RDWR);
502 pr_err("weird: %s cannot be opened\n", s->bitmap_file);
505 if (ioctl(fd, SET_BITMAP_FILE, bitmap_fd) < 0) {
508 pr_err("Cannot add bitmap while array is resyncing or reshaping etc.\n");
509 pr_err("Cannot set bitmap file for %s: %s\n",
510 devname, strerror(err));
519 * When reshaping an array we might need to backup some data.
520 * This is written to all spares with a 'super_block' describing it.
521 * The superblock goes 4K from the end of the used space on the
523 * It if written after the backup is complete.
524 * It has the following structure.
527 static struct mdp_backup_super {
528 char magic[16]; /* md_backup_data-1 or -2 */
531 /* start/sizes in 512byte sectors */
532 __u64 devstart; /* address on backup device/file of data */
535 __u32 sb_csum; /* csum of preceeding bytes. */
537 __u64 devstart2; /* offset in to data of second section */
540 __u32 sb_csum2; /* csum of preceeding bytes. */
542 } __attribute__((aligned(512))) bsb, bsb2;
544 static __u32 bsb_csum(char *buf, int len)
548 for (i = 0; i < len; i++)
549 csum = (csum<<3) + buf[0];
550 return __cpu_to_le32(csum);
553 static int check_idle(struct supertype *st)
555 /* Check that all member arrays for this container, or the
556 * container of this array, are idle
558 char *container = (st->container_devnm[0]
559 ? st->container_devnm : st->devnm);
560 struct mdstat_ent *ent, *e;
563 ent = mdstat_read(0, 0);
564 for (e = ent ; e; e = e->next) {
565 if (!is_container_member(e, container))
567 if (e->percent >= 0) {
576 static int freeze_container(struct supertype *st)
578 char *container = (st->container_devnm[0]
579 ? st->container_devnm : st->devnm);
584 if (block_monitor(container, 1)) {
585 pr_err("failed to freeze container\n");
592 static void unfreeze_container(struct supertype *st)
594 char *container = (st->container_devnm[0]
595 ? st->container_devnm : st->devnm);
597 unblock_monitor(container, 1);
600 static int freeze(struct supertype *st)
602 /* Try to freeze resync/rebuild on this array/container.
603 * Return -1 if the array is busy,
604 * return -2 container cannot be frozen,
605 * return 0 if this kernel doesn't support 'frozen'
606 * return 1 if it worked.
608 if (st->ss->external)
609 return freeze_container(st);
611 struct mdinfo *sra = sysfs_read(-1, st->devnm, GET_VERSION);
617 /* Need to clear any 'read-auto' status */
618 if (sysfs_get_str(sra, NULL, "array_state", buf, 20) > 0 &&
619 strncmp(buf, "read-auto", 9) == 0)
620 sysfs_set_str(sra, NULL, "array_state", "clean");
622 err = sysfs_freeze_array(sra);
628 static void unfreeze(struct supertype *st)
630 if (st->ss->external)
631 return unfreeze_container(st);
633 struct mdinfo *sra = sysfs_read(-1, st->devnm, GET_VERSION);
637 sysfs_get_str(sra, NULL, "sync_action", buf, 20) > 0
638 && strcmp(buf, "frozen\n") == 0)
639 sysfs_set_str(sra, NULL, "sync_action", "idle");
644 static void wait_reshape(struct mdinfo *sra)
646 int fd = sysfs_get_fd(sra, NULL, "sync_action");
652 while (sysfs_fd_get_str(fd, action, 20) > 0 &&
653 strncmp(action, "reshape", 7) == 0)
654 sysfs_wait(fd, NULL);
658 static int reshape_super(struct supertype *st, unsigned long long size,
659 int level, int layout, int chunksize, int raid_disks,
660 int delta_disks, char *backup_file, char *dev,
661 int direction, int verbose)
663 /* nothing extra to check in the native case */
664 if (!st->ss->external)
666 if (!st->ss->reshape_super ||
667 !st->ss->manage_reshape) {
668 pr_err("%s metadata does not support reshape\n",
673 return st->ss->reshape_super(st, size, level, layout, chunksize,
674 raid_disks, delta_disks, backup_file, dev,
678 static void sync_metadata(struct supertype *st)
680 if (st->ss->external) {
681 if (st->update_tail) {
682 flush_metadata_updates(st);
683 st->update_tail = &st->updates;
685 st->ss->sync_metadata(st);
689 static int subarray_set_num(char *container, struct mdinfo *sra, char *name, int n)
691 /* when dealing with external metadata subarrays we need to be
692 * prepared to handle EAGAIN. The kernel may need to wait for
693 * mdmon to mark the array active so the kernel can handle
694 * allocations/writeback when preparing the reshape action
695 * (md_allow_write()). We temporarily disable safe_mode_delay
696 * to close a race with the array_state going clean before the
697 * next write to raid_disks / stripe_cache_size
702 /* only 'raid_disks' and 'stripe_cache_size' trigger md_allow_write */
704 (strcmp(name, "raid_disks") != 0 &&
705 strcmp(name, "stripe_cache_size") != 0))
706 return sysfs_set_num(sra, NULL, name, n);
708 rc = sysfs_get_str(sra, NULL, "safe_mode_delay", safe, sizeof(safe));
711 sysfs_set_num(sra, NULL, "safe_mode_delay", 0);
712 rc = sysfs_set_num(sra, NULL, name, n);
713 if (rc < 0 && errno == EAGAIN) {
714 ping_monitor(container);
715 /* if we get EAGAIN here then the monitor is not active
718 rc = sysfs_set_num(sra, NULL, name, n);
720 sysfs_set_str(sra, NULL, "safe_mode_delay", safe);
724 int start_reshape(struct mdinfo *sra, int already_running,
725 int before_data_disks, int data_disks)
728 unsigned long long sync_max_to_set;
730 sysfs_set_num(sra, NULL, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL);
731 err = sysfs_set_num(sra, NULL, "suspend_hi", sra->reshape_progress);
732 err = err ?: sysfs_set_num(sra, NULL, "suspend_lo",
733 sra->reshape_progress);
734 if (before_data_disks <= data_disks)
735 sync_max_to_set = sra->reshape_progress / data_disks;
737 sync_max_to_set = (sra->component_size * data_disks
738 - sra->reshape_progress) / data_disks;
739 if (!already_running)
740 sysfs_set_num(sra, NULL, "sync_min", sync_max_to_set);
741 err = err ?: sysfs_set_num(sra, NULL, "sync_max", sync_max_to_set);
742 if (!already_running && err == 0) {
745 err = sysfs_set_str(sra, NULL, "sync_action", "reshape");
748 } while (err && errno == EBUSY && cnt-- > 0);
753 void abort_reshape(struct mdinfo *sra)
755 sysfs_set_str(sra, NULL, "sync_action", "idle");
757 * Prior to kernel commit: 23ddff3792f6 ("md: allow suspend_lo and
758 * suspend_hi to decrease as well as increase.")
759 * you could only increase suspend_{lo,hi} unless the region they
760 * covered was empty. So to reset to 0, you need to push suspend_lo
761 * up past suspend_hi first. So to maximize the chance of mdadm
762 * working on all kernels, we want to keep doing that.
764 sysfs_set_num(sra, NULL, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL);
765 sysfs_set_num(sra, NULL, "suspend_hi", 0);
766 sysfs_set_num(sra, NULL, "suspend_lo", 0);
767 sysfs_set_num(sra, NULL, "sync_min", 0);
768 // It isn't safe to reset sync_max as we aren't monitoring.
769 // Array really should be stopped at this point.
772 int remove_disks_for_takeover(struct supertype *st,
777 struct mdinfo *remaining;
780 if (st->ss->external) {
782 struct mdinfo *arrays = st->ss->container_content(st, NULL);
784 * containter_content returns list of arrays in container
785 * If arrays->next is not NULL it means that there are
786 * 2 arrays in container and operation should be blocked
793 pr_err("Error. Cannot perform operation on /dev/%s\n", st->devnm);
794 pr_err("For this operation it MUST be single array in container\n");
800 if (sra->array.level == 10)
801 nr_of_copies = layout & 0xff;
802 else if (sra->array.level == 1)
803 nr_of_copies = sra->array.raid_disks;
807 remaining = sra->devs;
809 /* for each 'copy', select one device and remove from the list. */
810 for (slot = 0; slot < sra->array.raid_disks; slot += nr_of_copies) {
811 struct mdinfo **diskp;
814 /* Find a working device to keep */
815 for (diskp = &remaining; *diskp ; diskp = &(*diskp)->next) {
816 struct mdinfo *disk = *diskp;
818 if (disk->disk.raid_disk < slot)
820 if (disk->disk.raid_disk >= slot + nr_of_copies)
822 if (disk->disk.state & (1<<MD_DISK_REMOVED))
824 if (disk->disk.state & (1<<MD_DISK_FAULTY))
826 if (!(disk->disk.state & (1<<MD_DISK_SYNC)))
829 /* We have found a good disk to use! */
831 disk->next = sra->devs;
840 if (slot < sra->array.raid_disks) {
841 /* didn't find all slots */
847 sra->devs = remaining;
851 /* Remove all 'remaining' devices from the array */
853 struct mdinfo *sd = remaining;
854 remaining = sd->next;
856 sysfs_set_str(sra, sd, "state", "faulty");
857 sysfs_set_str(sra, sd, "slot", "none");
858 /* for external metadata disks should be removed in mdmon */
859 if (!st->ss->external)
860 sysfs_set_str(sra, sd, "state", "remove");
861 sd->disk.state |= (1<<MD_DISK_REMOVED);
862 sd->disk.state &= ~(1<<MD_DISK_SYNC);
863 sd->next = sra->devs;
869 void reshape_free_fdlist(int *fdlist,
870 unsigned long long *offsets,
875 for (i = 0; i < size; i++)
883 int reshape_prepare_fdlist(char *devname,
887 unsigned long blocks,
890 unsigned long long *offsets)
896 for (d = 0; d <= nrdisks; d++)
899 for (sd = sra->devs; sd; sd = sd->next) {
900 if (sd->disk.state & (1<<MD_DISK_FAULTY))
902 if (sd->disk.state & (1<<MD_DISK_SYNC) &&
903 sd->disk.raid_disk < raid_disks) {
904 char *dn = map_dev(sd->disk.major,
906 fdlist[sd->disk.raid_disk]
907 = dev_open(dn, O_RDONLY);
908 offsets[sd->disk.raid_disk] = sd->data_offset*512;
909 if (fdlist[sd->disk.raid_disk] < 0) {
910 pr_err("%s: cannot open component %s\n",
911 devname, dn ? dn : "-unknown-");
915 } else if (backup_file == NULL) {
917 char *dn = map_dev(sd->disk.major,
919 fdlist[d] = dev_open(dn, O_RDWR);
920 offsets[d] = (sd->data_offset + sra->component_size - blocks - 8)*512;
922 pr_err("%s: cannot open component %s\n",
923 devname, dn ? dn : "-unknown-");
934 int reshape_open_backup_file(char *backup_file,
939 unsigned long long *offsets,
943 /* Return 1 on success, 0 on any form of failure */
944 /* need to check backup file is large enough */
950 *fdlist = open(backup_file, O_RDWR|O_CREAT|(restart ? O_TRUNC : O_EXCL),
954 pr_err("%s: cannot create backup file %s: %s\n",
955 devname, backup_file, strerror(errno));
958 /* Guard against backup file being on array device.
959 * If array is partitioned or if LVM etc is in the
960 * way this will not notice, but it is better than
963 fstat(*fdlist, &stb);
966 if (stb.st_rdev == dev) {
967 pr_err("backup file must NOT be on the array being reshaped.\n");
973 for (i=0; i < blocks + 8 ; i++) {
974 if (write(*fdlist, buf, 512) != 512) {
975 pr_err("%s: cannot create backup file %s: %s\n",
976 devname, backup_file, strerror(errno));
980 if (fsync(*fdlist) != 0) {
981 pr_err("%s: cannot create backup file %s: %s\n",
982 devname, backup_file, strerror(errno));
986 if (!restart && strncmp(backup_file, MAP_DIR, strlen(MAP_DIR)) != 0) {
987 char *bu = make_backup(sys_name);
988 if (symlink(backup_file, bu))
989 pr_err("Recording backup file in " MAP_DIR " failed: %s\n",
997 unsigned long compute_backup_blocks(int nchunk, int ochunk,
998 unsigned int ndata, unsigned int odata)
1000 unsigned long a, b, blocks;
1001 /* So how much do we need to backup.
1002 * We need an amount of data which is both a whole number of
1003 * old stripes and a whole number of new stripes.
1004 * So LCM for (chunksize*datadisks).
1006 a = (ochunk/512) * odata;
1007 b = (nchunk/512) * ndata;
1010 /* LCM == product / GCD */
1011 blocks = (ochunk/512) * (nchunk/512) * odata * ndata / a;
1016 char *analyse_change(char *devname, struct mdinfo *info, struct reshape *re)
1018 /* Based on the current array state in info->array and
1019 * the changes in info->new_* etc, determine:
1020 * - whether the change is possible
1021 * - Intermediate level/raid_disks/layout
1022 * - whether a restriping reshape is needed
1023 * - number of sectors in minimum change unit. This
1024 * will cover a whole number of stripes in 'before' and
1027 * Return message if the change should be rejected
1028 * NULL if the change can be achieved
1030 * This can be called as part of starting a reshape, or
1031 * when assembling an array that is undergoing reshape.
1033 int near, far, offset, copies;
1035 int old_chunk, new_chunk;
1036 /* delta_parity records change in number of devices
1037 * caused by level change
1039 int delta_parity = 0;
1041 memset(re, 0, sizeof(*re));
1043 /* If a new level not explicitly given, we assume no-change */
1044 if (info->new_level == UnSet)
1045 info->new_level = info->array.level;
1047 if (info->new_chunk)
1048 switch (info->new_level) {
1054 /* chunk size is meaningful, must divide component_size
1057 if (info->component_size % (info->new_chunk/512)) {
1058 unsigned long long shrink = info->component_size;
1059 shrink &= ~(unsigned long long)(info->new_chunk/512-1);
1060 pr_err("New chunk size (%dK) does not evenly divide device size (%lluk)\n",
1061 info->new_chunk/1024, info->component_size/2);
1062 pr_err("After shrinking any filesystem, \"mdadm --grow %s --size %llu\"\n",
1064 pr_err("will shrink the array so the given chunk size would work.\n");
1069 return "chunk size not meaningful for this level";
1072 info->new_chunk = info->array.chunk_size;
1074 switch (info->array.level) {
1076 return "No reshape is possibly for this RAID level";
1078 if (info->delta_disks != UnSet)
1079 return "Only --add is supported for LINEAR, setting --raid-disks is not needed";
1081 return "Only --add is supported for LINEAR, other --grow options are not meaningful";
1083 /* RAID1 can convert to RAID1 with different disks, or
1084 * raid5 with 2 disks, or
1087 if (info->new_level > 1 &&
1088 (info->component_size & 7))
1089 return "Cannot convert RAID1 of this size - reduce size to multiple of 4K first.";
1090 if (info->new_level == 0) {
1091 if (info->delta_disks != UnSet &&
1092 info->delta_disks != 0)
1093 return "Cannot change number of disks with RAID1->RAID0 conversion";
1095 re->before.data_disks = 1;
1096 re->after.data_disks = 1;
1099 if (info->new_level == 1) {
1100 if (info->delta_disks == UnSet)
1101 /* Don't know what to do */
1102 return "no change requested for Growing RAID1";
1106 if (info->array.raid_disks != 2 &&
1107 info->new_level == 5)
1108 return "Can only convert a 2-device array to RAID5";
1109 if (info->array.raid_disks == 2 &&
1110 info->new_level == 5) {
1113 re->before.data_disks = 1;
1114 if (info->delta_disks != UnSet &&
1115 info->delta_disks != 0)
1116 re->after.data_disks = 1 + info->delta_disks;
1118 re->after.data_disks = 1;
1119 if (re->after.data_disks < 1)
1120 return "Number of disks too small for RAID5";
1122 re->before.layout = ALGORITHM_LEFT_SYMMETRIC;
1123 info->array.chunk_size = 65536;
1126 /* Could do some multi-stage conversions, but leave that to
1129 return "Impossibly level change request for RAID1";
1132 /* RAID10 can be converted from near mode to
1133 * RAID0 by removing some devices.
1134 * It can also be reshaped if the kernel supports
1137 switch (info->new_level) {
1139 if ((info->array.layout & ~0xff) != 0x100)
1140 return "Cannot Grow RAID10 with far/offset layout";
1141 /* number of devices must be multiple of number of copies */
1142 if (info->array.raid_disks % (info->array.layout & 0xff))
1143 return "RAID10 layout too complex for Grow operation";
1145 new_disks = (info->array.raid_disks
1146 / (info->array.layout & 0xff));
1147 if (info->delta_disks == UnSet)
1148 info->delta_disks = (new_disks
1149 - info->array.raid_disks);
1151 if (info->delta_disks != new_disks - info->array.raid_disks)
1152 return "New number of raid-devices impossible for RAID10";
1153 if (info->new_chunk &&
1154 info->new_chunk != info->array.chunk_size)
1155 return "Cannot change chunk-size with RAID10 Grow";
1159 re->before.data_disks = new_disks;
1160 re->after.data_disks = re->before.data_disks;
1164 near = info->array.layout & 0xff;
1165 far = (info->array.layout >> 8) & 0xff;
1166 offset = info->array.layout & 0x10000;
1167 if (far > 1 && !offset)
1168 return "Cannot reshape RAID10 in far-mode";
1169 copies = near * far;
1171 old_chunk = info->array.chunk_size * far;
1173 if (info->new_layout == UnSet)
1174 info->new_layout = info->array.layout;
1176 near = info->new_layout & 0xff;
1177 far = (info->new_layout >> 8) & 0xff;
1178 offset = info->new_layout & 0x10000;
1179 if (far > 1 && !offset)
1180 return "Cannot reshape RAID10 to far-mode";
1181 if (near * far != copies)
1182 return "Cannot change number of copies when reshaping RAID10";
1184 if (info->delta_disks == UnSet)
1185 info->delta_disks = 0;
1186 new_disks = (info->array.raid_disks +
1189 new_chunk = info->new_chunk * far;
1192 re->before.layout = info->array.layout;
1193 re->before.data_disks = info->array.raid_disks;
1194 re->after.layout = info->new_layout;
1195 re->after.data_disks = new_disks;
1196 /* For RAID10 we don't do backup but do allow reshape,
1197 * so set backup_blocks to INVALID_SECTORS rather than
1199 * And there is no need to synchronise stripes on both
1200 * 'old' and 'new'. So the important
1201 * number is the minimum data_offset difference
1202 * which is the larger of (offset copies * chunk).
1204 re->backup_blocks = INVALID_SECTORS;
1205 re->min_offset_change = max(old_chunk, new_chunk) / 512;
1206 if (new_disks < re->before.data_disks &&
1207 info->space_after < re->min_offset_change)
1208 /* Reduce component size by one chunk */
1209 re->new_size = (info->component_size -
1210 re->min_offset_change);
1212 re->new_size = info->component_size;
1213 re->new_size = re->new_size * new_disks / copies;
1217 return "RAID10 can only be changed to RAID0";
1220 /* RAID0 can be converted to RAID10, or to RAID456 */
1221 if (info->new_level == 10) {
1222 if (info->new_layout == UnSet && info->delta_disks == UnSet) {
1223 /* Assume near=2 layout */
1224 info->new_layout = 0x102;
1225 info->delta_disks = info->array.raid_disks;
1227 if (info->new_layout == UnSet) {
1228 int copies = 1 + (info->delta_disks
1229 / info->array.raid_disks);
1230 if (info->array.raid_disks * (copies-1)
1231 != info->delta_disks)
1232 return "Impossible number of devices for RAID0->RAID10";
1233 info->new_layout = 0x100 + copies;
1235 if (info->delta_disks == UnSet) {
1236 int copies = info->new_layout & 0xff;
1237 if (info->new_layout != 0x100 + copies)
1238 return "New layout impossible for RAID0->RAID10";;
1239 info->delta_disks = (copies - 1) *
1240 info->array.raid_disks;
1242 if (info->new_chunk &&
1243 info->new_chunk != info->array.chunk_size)
1244 return "Cannot change chunk-size with RAID0->RAID10";
1247 re->before.data_disks = (info->array.raid_disks +
1249 re->after.data_disks = re->before.data_disks;
1250 re->before.layout = info->new_layout;
1254 /* RAID0 can also covert to RAID0/4/5/6 by first converting to
1255 * a raid4 style layout of the final level.
1257 switch (info->new_level) {
1262 re->before.layout = 0;
1267 re->before.layout = ALGORITHM_PARITY_N;
1268 if (info->new_layout == UnSet)
1269 info->new_layout = map_name(r5layout, "default");
1274 re->before.layout = ALGORITHM_PARITY_N;
1275 if (info->new_layout == UnSet)
1276 info->new_layout = map_name(r6layout, "default");
1279 return "Impossible level change requested";
1281 re->before.data_disks = info->array.raid_disks;
1282 /* determining 'after' layout happens outside this 'switch' */
1286 info->array.layout = ALGORITHM_PARITY_N;
1288 switch (info->new_level) {
1292 re->level = info->array.level;
1293 re->before.data_disks = info->array.raid_disks - 1;
1294 re->before.layout = info->array.layout;
1298 re->before.data_disks = info->array.raid_disks - 1;
1299 re->before.layout = info->array.layout;
1304 re->before.data_disks = info->array.raid_disks - 1;
1305 switch (info->array.layout) {
1306 case ALGORITHM_LEFT_ASYMMETRIC:
1307 re->before.layout = ALGORITHM_LEFT_ASYMMETRIC_6;
1309 case ALGORITHM_RIGHT_ASYMMETRIC:
1310 re->before.layout = ALGORITHM_RIGHT_ASYMMETRIC_6;
1312 case ALGORITHM_LEFT_SYMMETRIC:
1313 re->before.layout = ALGORITHM_LEFT_SYMMETRIC_6;
1315 case ALGORITHM_RIGHT_SYMMETRIC:
1316 re->before.layout = ALGORITHM_RIGHT_SYMMETRIC_6;
1318 case ALGORITHM_PARITY_0:
1319 re->before.layout = ALGORITHM_PARITY_0_6;
1321 case ALGORITHM_PARITY_N:
1322 re->before.layout = ALGORITHM_PARITY_N_6;
1325 return "Cannot convert an array with this layout";
1329 if (info->array.raid_disks != 2)
1330 return "Can only convert a 2-device array to RAID1";
1331 if (info->delta_disks != UnSet &&
1332 info->delta_disks != 0)
1333 return "Cannot set raid_disk when converting RAID5->RAID1";
1335 info->new_chunk = 0;
1338 return "Impossible level change requested";
1342 switch (info->new_level) {
1348 re->before.data_disks = info->array.raid_disks - 2;
1349 re->before.layout = info->array.layout;
1352 return "Impossible level change requested";
1357 /* If we reached here then it looks like a re-stripe is
1358 * happening. We have determined the intermediate level
1359 * and initial raid_disks/layout and stored these in 're'.
1361 * We need to deduce the final layout that can be atomically
1362 * converted to the end state.
1364 switch (info->new_level) {
1366 /* We can only get to RAID0 from RAID4 or RAID5
1367 * with appropriate layout and one extra device
1369 if (re->level != 4 && re->level != 5)
1370 return "Cannot covert to RAID0 from this level";
1372 switch (re->level) {
1374 re->before.layout = 0;
1375 re->after.layout = 0;
1378 re->after.layout = ALGORITHM_PARITY_N;
1384 /* We can only get to RAID4 from RAID5 */
1385 if (re->level != 4 && re->level != 5)
1386 return "Cannot convert to RAID4 from this level";
1388 switch (re->level) {
1390 re->after.layout = 0;
1393 re->after.layout = ALGORITHM_PARITY_N;
1399 /* We get to RAID5 from RAID5 or RAID6 */
1400 if (re->level != 5 && re->level != 6)
1401 return "Cannot convert to RAID5 from this level";
1403 switch (re->level) {
1405 if (info->new_layout == UnSet)
1406 re->after.layout = re->before.layout;
1408 re->after.layout = info->new_layout;
1411 if (info->new_layout == UnSet)
1412 info->new_layout = re->before.layout;
1414 /* after.layout needs to be raid6 version of new_layout */
1415 if (info->new_layout == ALGORITHM_PARITY_N)
1416 re->after.layout = ALGORITHM_PARITY_N;
1419 char *ls = map_num(r5layout, info->new_layout);
1422 /* Current RAID6 layout has a RAID5
1425 strcat(strcpy(layout, ls), "-6");
1426 l = map_name(r6layout, layout);
1428 return "Cannot find RAID6 layout to convert to";
1430 /* Current RAID6 has no equivalent.
1431 * If it is already a '-6' layout we
1432 * can leave it unchanged, else we must
1435 ls = map_num(r6layout, info->new_layout);
1437 strcmp(ls+strlen(ls)-2, "-6") != 0)
1438 return "Please specify new layout";
1439 l = info->new_layout;
1441 re->after.layout = l;
1447 /* We must already be at level 6 */
1449 return "Impossible level change";
1450 if (info->new_layout == UnSet)
1451 re->after.layout = info->array.layout;
1453 re->after.layout = info->new_layout;
1456 return "Impossible level change requested";
1458 if (info->delta_disks == UnSet)
1459 info->delta_disks = delta_parity;
1461 re->after.data_disks = (re->before.data_disks
1464 switch (re->level) {
1465 case 6: re->parity = 2;
1468 case 5: re->parity = 1;
1470 default: re->parity = 0;
1473 /* So we have a restripe operation, we need to calculate the number
1474 * of blocks per reshape operation.
1476 re->new_size = info->component_size * re->before.data_disks;
1477 if (info->new_chunk == 0)
1478 info->new_chunk = info->array.chunk_size;
1479 if (re->after.data_disks == re->before.data_disks &&
1480 re->after.layout == re->before.layout &&
1481 info->new_chunk == info->array.chunk_size) {
1482 /* Nothing to change, can change level immediately. */
1483 re->level = info->new_level;
1484 re->backup_blocks = 0;
1487 if (re->after.data_disks == 1 && re->before.data_disks == 1) {
1488 /* chunk and layout changes make no difference */
1489 re->level = info->new_level;
1490 re->backup_blocks = 0;
1494 if (re->after.data_disks == re->before.data_disks &&
1495 get_linux_version() < 2006032)
1496 return "in-place reshape is not safe before 2.6.32 - sorry.";
1498 if (re->after.data_disks < re->before.data_disks &&
1499 get_linux_version() < 2006030)
1500 return "reshape to fewer devices is not supported before 2.6.30 - sorry.";
1502 re->backup_blocks = compute_backup_blocks(
1503 info->new_chunk, info->array.chunk_size,
1504 re->after.data_disks,
1505 re->before.data_disks);
1506 re->min_offset_change = re->backup_blocks / re->before.data_disks;
1508 re->new_size = info->component_size * re->after.data_disks;
1512 static int set_array_size(struct supertype *st, struct mdinfo *sra,
1515 struct mdinfo *info;
1519 if ((st == NULL) || (sra == NULL))
1522 if (text_version == NULL)
1523 text_version = sra->text_version;
1524 subarray = strchr(text_version+1, '/')+1;
1525 info = st->ss->container_content(st, subarray);
1527 unsigned long long current_size = 0;
1528 unsigned long long new_size =
1529 info->custom_array_size/2;
1531 if (sysfs_get_ll(sra, NULL, "array_size", ¤t_size) == 0 &&
1532 new_size > current_size) {
1533 if (sysfs_set_num(sra, NULL, "array_size", new_size)
1535 dprintf("Error: Cannot set array size");
1538 dprintf("Array size changed");
1540 dprintf_cont(" from %llu to %llu.\n",
1541 current_size, new_size);
1545 dprintf("Error: set_array_size(): info pointer in NULL\n");
1550 static int reshape_array(char *container, int fd, char *devname,
1551 struct supertype *st, struct mdinfo *info,
1552 int force, struct mddev_dev *devlist,
1553 unsigned long long data_offset,
1554 char *backup_file, int verbose, int forked,
1555 int restart, int freeze_reshape);
1556 static int reshape_container(char *container, char *devname,
1558 struct supertype *st,
1559 struct mdinfo *info,
1561 char *backup_file, int verbose,
1562 int forked, int restart, int freeze_reshape);
1564 int Grow_reshape(char *devname, int fd,
1565 struct mddev_dev *devlist,
1566 unsigned long long data_offset,
1567 struct context *c, struct shape *s)
1569 /* Make some changes in the shape of an array.
1570 * The kernel must support the change.
1572 * There are three different changes. Each can trigger
1573 * a resync or recovery so we freeze that until we have
1574 * requested everything (if kernel supports freezing - 2.6.30).
1576 * - change size (i.e. component_size)
1578 * - change layout/chunksize/ndisks
1580 * The last can require a reshape. It is different on different
1581 * levels so we need to check the level before actioning it.
1582 * Some times the level change needs to be requested after the
1583 * reshape (e.g. raid6->raid5, raid5->raid0)
1586 struct mdu_array_info_s array;
1588 struct supertype *st;
1589 char *subarray = NULL;
1593 char *container = NULL;
1596 struct mddev_dev *dv;
1602 if (ioctl(fd, GET_ARRAY_INFO, &array) < 0) {
1603 pr_err("%s is not an active md array - aborting\n",
1607 if (data_offset != INVALID_SECTORS && array.level != 10
1608 && (array.level < 4 || array.level > 6)) {
1609 pr_err("--grow --data-offset not yet supported\n");
1614 (s->chunk || s->level!= UnSet || s->layout_str || s->raiddisks)) {
1615 pr_err("cannot change component size at the same time as other changes.\n"
1616 " Change size first, then check data is intact before making other changes.\n");
1620 if (s->raiddisks && s->raiddisks < array.raid_disks && array.level > 1 &&
1621 get_linux_version() < 2006032 &&
1622 !check_env("MDADM_FORCE_FEWER")) {
1623 pr_err("reducing the number of devices is not safe before Linux 2.6.32\n"
1624 " Please use a newer kernel\n");
1628 st = super_by_fd(fd, &subarray);
1630 pr_err("Unable to determine metadata format for %s\n", devname);
1633 if (s->raiddisks > st->max_devs) {
1634 pr_err("Cannot increase raid-disks on this array beyond %d\n", st->max_devs);
1637 if (s->level == 0 &&
1638 (array.state & (1<<MD_SB_BITMAP_PRESENT)) &&
1639 !(array.state & (1<<MD_SB_CLUSTERED))) {
1640 array.state &= ~(1<<MD_SB_BITMAP_PRESENT);
1641 if (ioctl(fd, SET_ARRAY_INFO, &array)!= 0) {
1642 pr_err("failed to remove internal bitmap.\n");
1647 /* in the external case we need to check that the requested reshape is
1648 * supported, and perform an initial check that the container holds the
1649 * pre-requisite spare devices (mdmon owns final validation)
1651 if (st->ss->external) {
1655 container = st->container_devnm;
1656 cfd = open_dev_excl(st->container_devnm);
1658 container = st->devnm;
1660 cfd = open_dev_excl(st->devnm);
1664 pr_err("Unable to open container for %s\n",
1670 rv = st->ss->load_container(st, cfd, NULL);
1673 pr_err("Cannot read superblock for %s\n",
1679 /* check if operation is supported for metadata handler */
1680 if (st->ss->container_content) {
1681 struct mdinfo *cc = NULL;
1682 struct mdinfo *content = NULL;
1684 cc = st->ss->container_content(st, subarray);
1685 for (content = cc; content ; content = content->next) {
1686 int allow_reshape = 1;
1688 /* check if reshape is allowed based on metadata
1689 * indications stored in content.array.status
1691 if (content->array.state & (1<<MD_SB_BLOCK_VOLUME))
1693 if (content->array.state
1694 & (1<<MD_SB_BLOCK_CONTAINER_RESHAPE))
1696 if (!allow_reshape) {
1697 pr_err("cannot reshape arrays in container with unsupported metadata: %s(%s)\n",
1698 devname, container);
1706 if (mdmon_running(container))
1707 st->update_tail = &st->updates;
1711 for (dv = devlist; dv; dv = dv->next)
1713 if (s->raiddisks > array.raid_disks &&
1714 array.spare_disks +added_disks < (s->raiddisks - array.raid_disks) &&
1716 pr_err("Need %d spare%s to avoid degraded array, and only have %d.\n"
1717 " Use --force to over-ride this check.\n",
1718 s->raiddisks - array.raid_disks,
1719 s->raiddisks - array.raid_disks == 1 ? "" : "s",
1720 array.spare_disks + added_disks);
1724 sra = sysfs_read(fd, NULL, GET_LEVEL | GET_DISKS | GET_DEVS
1725 | GET_STATE | GET_VERSION);
1727 if (st->ss->external && subarray == NULL) {
1728 array.level = LEVEL_CONTAINER;
1729 sra->array.level = LEVEL_CONTAINER;
1732 pr_err("failed to read sysfs parameters for %s\n",
1736 frozen = freeze(st);
1738 /* freeze() already spewed the reason */
1741 } else if (frozen < 0) {
1742 pr_err("%s is performing resync/recovery and cannot be reshaped\n", devname);
1747 /* ========= set size =============== */
1748 if (s->size > 0 && (s->size == MAX_SIZE || s->size != (unsigned)array.size)) {
1749 unsigned long long orig_size = get_component_size(fd)/2;
1750 unsigned long long min_csize;
1752 int raid0_takeover = 0;
1755 orig_size = (unsigned) array.size;
1757 if (orig_size == 0) {
1758 pr_err("Cannot set device size in this type of array.\n");
1763 if (reshape_super(st, s->size, UnSet, UnSet, 0, 0, UnSet, NULL,
1764 devname, APPLY_METADATA_CHANGES, c->verbose > 0)) {
1769 if (st->ss->external) {
1770 /* metadata can have size limitation
1771 * update size value according to metadata information
1773 struct mdinfo *sizeinfo =
1774 st->ss->container_content(st, subarray);
1776 unsigned long long new_size =
1777 sizeinfo->custom_array_size/2;
1778 int data_disks = get_data_disks(
1779 sizeinfo->array.level,
1780 sizeinfo->array.layout,
1781 sizeinfo->array.raid_disks);
1782 new_size /= data_disks;
1783 dprintf("Metadata size correction from %llu to %llu (%llu)\n", orig_size, new_size,
1784 new_size * data_disks);
1786 sysfs_free(sizeinfo);
1790 /* Update the size of each member device in case
1791 * they have been resized. This will never reduce
1792 * below the current used-size. The "size" attribute
1793 * understands '0' to mean 'max'.
1797 for (mdi = sra->devs; mdi; mdi = mdi->next) {
1798 if (sysfs_set_num(sra, mdi, "size",
1799 s->size == MAX_SIZE ? 0 : s->size) < 0) {
1800 /* Probably kernel refusing to let us
1801 * reduce the size - not an error.
1805 if (array.not_persistent == 0 &&
1806 array.major_version == 0 &&
1807 get_linux_version() < 3001000) {
1808 /* Dangerous to allow size to exceed 2TB */
1809 unsigned long long csize;
1810 if (sysfs_get_ll(sra, mdi, "size", &csize) == 0) {
1811 if (csize >= 2ULL*1024*1024*1024)
1812 csize = 2ULL*1024*1024*1024;
1813 if ((min_csize == 0 || (min_csize
1820 pr_err("Cannot set size on array members.\n");
1821 goto size_change_error;
1823 if (min_csize && s->size > min_csize) {
1824 pr_err("Cannot safely make this array use more than 2TB per device on this kernel.\n");
1826 goto size_change_error;
1828 if (min_csize && s->size == MAX_SIZE) {
1829 /* Don't let the kernel choose a size - it will get
1832 pr_err("Limited v0.90 array to 2TB per device\n");
1833 s->size = min_csize;
1835 if (st->ss->external) {
1836 if (sra->array.level == 0) {
1837 rv = sysfs_set_str(sra, NULL, "level",
1841 /* get array parameters after takeover
1842 * to change one parameter at time only
1844 rv = ioctl(fd, GET_ARRAY_INFO, &array);
1847 /* make sure mdmon is
1848 * aware of the new level */
1849 if (!mdmon_running(st->container_devnm))
1850 start_mdmon(st->container_devnm);
1851 ping_monitor(container);
1852 if (mdmon_running(st->container_devnm) &&
1853 st->update_tail == NULL)
1854 st->update_tail = &st->updates;
1857 if (s->size == MAX_SIZE)
1859 array.size = s->size;
1860 if (s->size & ~INT32_MAX) {
1861 /* got truncated to 32bit, write to
1862 * component_size instead
1865 rv = sysfs_set_num(sra, NULL,
1866 "component_size", s->size);
1870 rv = ioctl(fd, SET_ARRAY_INFO, &array);
1872 /* manage array size when it is managed externally
1874 if ((rv == 0) && st->ss->external)
1875 rv = set_array_size(st, sra, sra->text_version);
1878 if (raid0_takeover) {
1879 /* do not recync non-existing parity,
1880 * we will drop it anyway
1882 sysfs_set_str(sra, NULL, "sync_action", "frozen");
1883 /* go back to raid0, drop parity disk
1885 sysfs_set_str(sra, NULL, "level", "raid0");
1886 ioctl(fd, GET_ARRAY_INFO, &array);
1893 /* restore metadata */
1894 if (reshape_super(st, orig_size, UnSet, UnSet, 0, 0,
1895 UnSet, NULL, devname,
1896 ROLLBACK_METADATA_CHANGES,
1899 pr_err("Cannot set device size for %s: %s\n",
1900 devname, strerror(err));
1902 (array.state & (1<<MD_SB_BITMAP_PRESENT)))
1903 cont_err("Bitmap must be removed before size can be changed\n");
1907 if (s->assume_clean) {
1908 /* This will fail on kernels older than 3.0 unless
1909 * a backport has been arranged.
1912 sysfs_set_str(sra, NULL, "resync_start", "none") < 0)
1913 pr_err("--assume-clean not supported with --grow on this kernel\n");
1915 ioctl(fd, GET_ARRAY_INFO, &array);
1916 s->size = get_component_size(fd)/2;
1918 s->size = array.size;
1919 if (c->verbose >= 0) {
1920 if (s->size == orig_size)
1921 pr_err("component size of %s unchanged at %lluK\n",
1924 pr_err("component size of %s has been set to %lluK\n",
1928 } else if (array.level != LEVEL_CONTAINER) {
1929 s->size = get_component_size(fd)/2;
1931 s->size = array.size;
1934 /* See if there is anything else to do */
1935 if ((s->level == UnSet || s->level == array.level) &&
1936 (s->layout_str == NULL) &&
1937 (s->chunk == 0 || s->chunk == array.chunk_size) &&
1938 data_offset == INVALID_SECTORS &&
1939 (s->raiddisks == 0 || s->raiddisks == array.raid_disks)) {
1940 /* Nothing more to do */
1941 if (!changed && c->verbose >= 0)
1942 pr_err("%s: no change requested\n",
1947 /* ========= check for Raid10/Raid1 -> Raid0 conversion ===============
1948 * current implementation assumes that following conditions must be met:
1951 * - near_copies == 2
1953 if ((s->level == 0 && array.level == 10 && sra &&
1954 array.layout == ((1 << 8) + 2) && !(array.raid_disks & 1)) ||
1955 (s->level == 0 && array.level == 1 && sra)) {
1957 err = remove_disks_for_takeover(st, sra, array.layout);
1959 dprintf("Array cannot be reshaped\n");
1965 /* Make sure mdmon has seen the device removal
1966 * and updated metadata before we continue with
1970 ping_monitor(container);
1973 memset(&info, 0, sizeof(info));
1975 sysfs_init(&info, fd, NULL);
1976 strcpy(info.text_version, sra->text_version);
1977 info.component_size = s->size*2;
1978 info.new_level = s->level;
1979 info.new_chunk = s->chunk * 1024;
1980 if (info.array.level == LEVEL_CONTAINER) {
1981 info.delta_disks = UnSet;
1982 info.array.raid_disks = s->raiddisks;
1983 } else if (s->raiddisks)
1984 info.delta_disks = s->raiddisks - info.array.raid_disks;
1986 info.delta_disks = UnSet;
1987 if (s->layout_str == NULL) {
1988 info.new_layout = UnSet;
1989 if (info.array.level == 6 &&
1990 (info.new_level == 6 || info.new_level == UnSet) &&
1991 info.array.layout >= 16) {
1992 pr_err("%s has a non-standard layout. If you wish to preserve this\n", devname);
1993 cont_err("during the reshape, please specify --layout=preserve\n");
1994 cont_err("If you want to change it, specify a layout or use --layout=normalise\n");
1998 } else if (strcmp(s->layout_str, "normalise") == 0 ||
1999 strcmp(s->layout_str, "normalize") == 0) {
2000 /* If we have a -6 RAID6 layout, remove the '-6'. */
2001 info.new_layout = UnSet;
2002 if (info.array.level == 6 && info.new_level == UnSet) {
2004 strcpy(l, map_num(r6layout, info.array.layout));
2005 h = strrchr(l, '-');
2006 if (h && strcmp(h, "-6") == 0) {
2008 info.new_layout = map_name(r6layout, l);
2011 pr_err("%s is only meaningful when reshaping a RAID6 array.\n", s->layout_str);
2015 } else if (strcmp(s->layout_str, "preserve") == 0) {
2016 /* This means that a non-standard RAID6 layout
2019 * - When reshape a RAID6 (e.g. adding a device)
2020 * which is in a non-standard layout, it is OK
2021 * to preserve that layout.
2022 * - When converting a RAID5 to RAID6, leave it in
2023 * the XXX-6 layout, don't re-layout.
2025 if (info.array.level == 6 && info.new_level == UnSet)
2026 info.new_layout = info.array.layout;
2027 else if (info.array.level == 5 && info.new_level == 6) {
2029 strcpy(l, map_num(r5layout, info.array.layout));
2031 info.new_layout = map_name(r6layout, l);
2033 pr_err("%s in only meaningful when reshaping to RAID6\n", s->layout_str);
2038 int l = info.new_level;
2040 l = info.array.level;
2043 info.new_layout = map_name(r5layout, s->layout_str);
2046 info.new_layout = map_name(r6layout, s->layout_str);
2049 info.new_layout = parse_layout_10(s->layout_str);
2052 info.new_layout = parse_layout_faulty(s->layout_str);
2055 pr_err("layout not meaningful with this level\n");
2059 if (info.new_layout == UnSet) {
2060 pr_err("layout %s not understood for this level\n",
2067 if (array.level == LEVEL_FAULTY) {
2068 if (s->level != UnSet && s->level != array.level) {
2069 pr_err("cannot change level of Faulty device\n");
2073 pr_err("cannot set chunksize of Faulty device\n");
2076 if (s->raiddisks && s->raiddisks != 1) {
2077 pr_err("cannot set raid_disks of Faulty device\n");
2080 if (s->layout_str) {
2081 if (ioctl(fd, GET_ARRAY_INFO, &array) != 0) {
2082 dprintf("Cannot get array information.\n");
2085 array.layout = info.new_layout;
2086 if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
2087 pr_err("failed to set new layout\n");
2089 } else if (c->verbose >= 0)
2090 printf("layout for %s set to %d\n",
2091 devname, array.layout);
2093 } else if (array.level == LEVEL_CONTAINER) {
2094 /* This change is to be applied to every array in the
2095 * container. This is only needed when the metadata imposes
2096 * restraints of the various arrays in the container.
2097 * Currently we only know that IMSM requires all arrays
2098 * to have the same number of devices so changing the
2099 * number of devices (On-Line Capacity Expansion) must be
2100 * performed at the level of the container
2106 rv = reshape_container(container, devname, -1, st, &info,
2107 c->force, c->backup_file, c->verbose, 0, 0, 0);
2110 /* get spare devices from external metadata
2112 if (st->ss->external) {
2113 struct mdinfo *info2;
2115 info2 = st->ss->container_content(st, subarray);
2117 info.array.spare_disks =
2118 info2->array.spare_disks;
2123 /* Impose these changes on a single array. First
2124 * check that the metadata is OK with the change. */
2126 if (reshape_super(st, 0, info.new_level,
2127 info.new_layout, info.new_chunk,
2128 info.array.raid_disks, info.delta_disks,
2129 c->backup_file, devname, APPLY_METADATA_CHANGES,
2135 rv = reshape_array(container, fd, devname, st, &info, c->force,
2136 devlist, data_offset, c->backup_file, c->verbose,
2147 /* verify_reshape_position()
2148 * Function checks if reshape position in metadata is not farther
2149 * than position in md.
2151 * 0 : not valid sysfs entry
2152 * it can be caused by not started reshape, it should be started
2153 * by reshape array or raid0 array is before takeover
2154 * -1 : error, reshape position is obviously wrong
2155 * 1 : success, reshape progress correct or updated
2157 static int verify_reshape_position(struct mdinfo *info, int level)
2163 /* read sync_max, failure can mean raid0 array */
2164 rv = sysfs_get_str(info, NULL, "sync_max", buf, 40);
2168 unsigned long long position = strtoull(buf, &ep, 0);
2170 dprintf("Read sync_max sysfs entry is: %s\n", buf);
2171 if (!(ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' '))) {
2172 position *= get_data_disks(level,
2174 info->array.raid_disks);
2175 if (info->reshape_progress < position) {
2176 dprintf("Corrected reshape progress (%llu) to md position (%llu)\n",
2177 info->reshape_progress, position);
2178 info->reshape_progress = position;
2180 } else if (info->reshape_progress > position) {
2181 pr_err("Fatal error: array reshape was not properly frozen (expected reshape position is %llu, but reshape progress is %llu.\n",
2182 position, info->reshape_progress);
2185 dprintf("Reshape position in md and metadata are the same;");
2189 } else if (rv == 0) {
2190 /* for valid sysfs entry, 0-length content
2191 * should be indicated as error
2199 static unsigned long long choose_offset(unsigned long long lo,
2200 unsigned long long hi,
2201 unsigned long long min,
2202 unsigned long long max)
2204 /* Choose a new offset between hi and lo.
2205 * It must be between min and max, but
2206 * we would prefer something near the middle of hi/lo, and also
2207 * prefer to be aligned to a big power of 2.
2209 * So we start with the middle, then for each bit,
2210 * starting at '1' and increasing, if it is set, we either
2211 * add it or subtract it if possible, preferring the option
2212 * which is furthest from the boundary.
2214 * We stop once we get a 1MB alignment. As units are in sectors,
2215 * 1MB = 2*1024 sectors.
2217 unsigned long long choice = (lo + hi) / 2;
2218 unsigned long long bit = 1;
2220 for (bit = 1; bit < 2*1024; bit = bit << 1) {
2221 unsigned long long bigger, smaller;
2222 if (! (bit & choice))
2224 bigger = choice + bit;
2225 smaller = choice - bit;
2226 if (bigger > max && smaller < min)
2230 else if (smaller < min)
2232 else if (hi - bigger > smaller - lo)
2240 static int set_new_data_offset(struct mdinfo *sra, struct supertype *st,
2241 char *devname, int delta_disks,
2242 unsigned long long data_offset,
2243 unsigned long long min,
2249 unsigned long long before, after;
2251 /* Need to find min space before and after so same is used
2254 before = UINT64_MAX;
2256 for (sd = sra->devs; sd; sd = sd->next) {
2260 struct supertype *st2;
2261 struct mdinfo info2;
2263 if (sd->disk.state & (1<<MD_DISK_FAULTY))
2265 dn = map_dev(sd->disk.major, sd->disk.minor, 0);
2266 dfd = dev_open(dn, O_RDONLY);
2268 pr_err("%s: cannot open component %s\n",
2269 devname, dn ? dn : "-unknown-");
2272 st2 = dup_super(st);
2273 rv = st2->ss->load_super(st2,dfd, NULL);
2277 pr_err("%s: cannot get superblock from %s\n",
2281 st2->ss->getinfo_super(st2, &info2, NULL);
2282 st2->ss->free_super(st2);
2284 if (info2.space_before == 0 &&
2285 info2.space_after == 0) {
2286 /* Metadata doesn't support data_offset changes */
2288 pr_err("%s: Metadata version doesn't support data_offset changes\n",
2292 if (before > info2.space_before)
2293 before = info2.space_before;
2294 if (after > info2.space_after)
2295 after = info2.space_after;
2297 if (data_offset != INVALID_SECTORS) {
2299 if (info2.data_offset == data_offset) {
2300 pr_err("%s: already has that data_offset\n",
2304 if (data_offset < info2.data_offset)
2308 } else if ((data_offset <= info2.data_offset && dir == 1) ||
2309 (data_offset >= info2.data_offset && dir == -1)) {
2310 pr_err("%s: differing data offsets on devices make this --data-offset setting impossible\n",
2316 if (before == UINT64_MAX)
2317 /* impossible really, there must be no devices */
2320 for (sd = sra->devs; sd; sd = sd->next) {
2321 char *dn = map_dev(sd->disk.major, sd->disk.minor, 0);
2322 unsigned long long new_data_offset;
2324 if (sd->disk.state & (1<<MD_DISK_FAULTY))
2326 if (delta_disks < 0) {
2327 /* Don't need any space as array is shrinking
2328 * just move data_offset up by min
2330 if (data_offset == INVALID_SECTORS)
2331 new_data_offset = sd->data_offset + min;
2333 if (data_offset < sd->data_offset + min) {
2334 pr_err("--data-offset too small for %s\n",
2338 new_data_offset = data_offset;
2340 } else if (delta_disks > 0) {
2341 /* need space before */
2345 pr_err("Insufficient head-space for reshape on %s\n",
2349 if (data_offset == INVALID_SECTORS)
2350 new_data_offset = sd->data_offset - min;
2352 if (data_offset > sd->data_offset - min) {
2353 pr_err("--data-offset too large for %s\n",
2357 new_data_offset = data_offset;
2361 /* can move up or down. If 'data_offset'
2362 * was set we would have already decided,
2363 * so just choose direction with most space.
2370 sysfs_set_str(sra, NULL, "reshape_direction",
2371 dir == 1 ? "backwards" : "forwards");
2373 /* Increase data offset */
2377 pr_err("Insufficient tail-space for reshape on %s\n",
2381 if (data_offset != INVALID_SECTORS &&
2382 data_offset < sd->data_offset + min) {
2383 pr_err("--data-offset too small on %s\n",
2387 if (data_offset != INVALID_SECTORS)
2388 new_data_offset = data_offset;
2390 new_data_offset = choose_offset(sd->data_offset,
2391 sd->data_offset + after,
2392 sd->data_offset + min,
2393 sd->data_offset + after);
2395 /* Decrease data offset */
2399 pr_err("insufficient head-room on %s\n",
2403 if (data_offset != INVALID_SECTORS &&
2404 data_offset < sd->data_offset - min) {
2405 pr_err("--data-offset too small on %s\n",
2409 if (data_offset != INVALID_SECTORS)
2410 new_data_offset = data_offset;
2412 new_data_offset = choose_offset(sd->data_offset - before,
2414 sd->data_offset - before,
2415 sd->data_offset - min);
2418 err = sysfs_set_num(sra, sd, "new_offset", new_data_offset);
2419 if (err < 0 && errno == E2BIG) {
2420 /* try again after increasing data size to max */
2421 err = sysfs_set_num(sra, sd, "size", 0);
2422 if (err < 0 && errno == EINVAL &&
2423 !(sd->disk.state & (1<<MD_DISK_SYNC))) {
2424 /* some kernels have a bug where you cannot
2425 * use '0' on spare devices. */
2426 sysfs_set_num(sra, sd, "size",
2427 (sra->component_size + after)/2);
2429 err = sysfs_set_num(sra, sd, "new_offset",
2433 if (errno == E2BIG && data_offset != INVALID_SECTORS) {
2434 pr_err("data-offset is too big for %s\n",
2438 if (sd == sra->devs &&
2439 (errno == ENOENT || errno == E2BIG))
2440 /* Early kernel, no 'new_offset' file,
2441 * or kernel doesn't like us.
2442 * For RAID5/6 this is not fatal
2445 pr_err("Cannot set new_offset for %s\n",
2454 /* Just use a backup file */
2458 static int raid10_reshape(char *container, int fd, char *devname,
2459 struct supertype *st, struct mdinfo *info,
2460 struct reshape *reshape,
2461 unsigned long long data_offset,
2462 int force, int verbose)
2464 /* Changing raid_disks, layout, chunksize or possibly
2465 * just data_offset for a RAID10.
2466 * We must always change data_offset. We change by at least
2467 * ->min_offset_change which is the largest of the old and new
2469 * If raid_disks is increasing, then data_offset must decrease
2470 * by at least this copy size.
2471 * If raid_disks is unchanged, data_offset must increase or
2472 * decrease by at least min_offset_change but preferably by much more.
2473 * We choose half of the available space.
2474 * If raid_disks is decreasing, data_offset must increase by
2475 * at least min_offset_change. To allow of this, component_size
2476 * must be decreased by the same amount.
2478 * So we calculate the required minimum and direction, possibly
2479 * reduce the component_size, then iterate through the devices
2480 * and set the new_data_offset.
2481 * If that all works, we set chunk_size, layout, raid_disks, and start
2485 unsigned long long min;
2488 sra = sysfs_read(fd, NULL,
2489 GET_COMPONENT|GET_DEVS|GET_OFFSET|GET_STATE|GET_CHUNK
2492 pr_err("%s: Cannot get array details from sysfs\n",
2496 min = reshape->min_offset_change;
2498 if (info->delta_disks)
2499 sysfs_set_str(sra, NULL, "reshape_direction",
2500 info->delta_disks < 0 ? "backwards" : "forwards");
2501 if (info->delta_disks < 0 &&
2502 info->space_after < min) {
2503 int rv = sysfs_set_num(sra, NULL, "component_size",
2504 (sra->component_size -
2507 pr_err("cannot reduce component size\n");
2511 err = set_new_data_offset(sra, st, devname, info->delta_disks, data_offset,
2514 pr_err("Cannot set new_data_offset: RAID10 reshape not\n");
2515 cont_err("supported on this kernel\n");
2521 if (!err && sysfs_set_num(sra, NULL, "chunk_size", info->new_chunk) < 0)
2523 if (!err && sysfs_set_num(sra, NULL, "layout", reshape->after.layout) < 0)
2525 if (!err && sysfs_set_num(sra, NULL, "raid_disks",
2526 info->array.raid_disks + info->delta_disks) < 0)
2528 if (!err && sysfs_set_str(sra, NULL, "sync_action", "reshape") < 0)
2531 pr_err("Cannot set array shape for %s\n",
2534 (info->array.state & (1<<MD_SB_BITMAP_PRESENT)))
2535 cont_err(" Bitmap must be removed before shape can be changed\n");
2545 static void get_space_after(int fd, struct supertype *st, struct mdinfo *info)
2547 struct mdinfo *sra, *sd;
2548 /* Initialisation to silence compiler warning */
2549 unsigned long long min_space_before = 0, min_space_after = 0;
2552 sra = sysfs_read(fd, NULL, GET_DEVS);
2555 for (sd = sra->devs; sd; sd = sd->next) {
2558 struct supertype *st2;
2559 struct mdinfo info2;
2561 if (sd->disk.state & (1<<MD_DISK_FAULTY))
2563 dn = map_dev(sd->disk.major, sd->disk.minor, 0);
2564 dfd = dev_open(dn, O_RDONLY);
2567 st2 = dup_super(st);
2568 if (st2->ss->load_super(st2,dfd, NULL)) {
2574 st2->ss->getinfo_super(st2, &info2, NULL);
2575 st2->ss->free_super(st2);
2578 min_space_before > info2.space_before)
2579 min_space_before = info2.space_before;
2581 min_space_after > info2.space_after)
2582 min_space_after = info2.space_after;
2585 if (sd == NULL && !first) {
2586 info->space_after = min_space_after;
2587 info->space_before = min_space_before;
2592 static void update_cache_size(char *container, struct mdinfo *sra,
2593 struct mdinfo *info,
2594 int disks, unsigned long long blocks)
2596 /* Check that the internal stripe cache is
2597 * large enough, or it won't work.
2598 * It must hold at least 4 stripes of the larger
2601 unsigned long cache;
2602 cache = max(info->array.chunk_size, info->new_chunk);
2603 cache *= 4; /* 4 stripes minimum */
2604 cache /= 512; /* convert to sectors */
2605 /* make sure there is room for 'blocks' with a bit to spare */
2606 if (cache < 16 + blocks / disks)
2607 cache = 16 + blocks / disks;
2608 cache /= (4096/512); /* Convert from sectors to pages */
2610 if (sra->cache_size < cache)
2611 subarray_set_num(container, sra, "stripe_cache_size",
2615 static int impose_reshape(struct mdinfo *sra,
2616 struct mdinfo *info,
2617 struct supertype *st,
2620 char *devname, char *container,
2621 struct reshape *reshape)
2623 struct mdu_array_info_s array;
2625 sra->new_chunk = info->new_chunk;
2628 /* for external metadata checkpoint saved by mdmon can be lost
2629 * or missed /due to e.g. crash/. Check if md is not during
2630 * restart farther than metadata points to.
2631 * If so, this means metadata information is obsolete.
2633 if (st->ss->external)
2634 verify_reshape_position(info, reshape->level);
2635 sra->reshape_progress = info->reshape_progress;
2637 sra->reshape_progress = 0;
2638 if (reshape->after.data_disks < reshape->before.data_disks)
2639 /* start from the end of the new array */
2640 sra->reshape_progress = (sra->component_size
2641 * reshape->after.data_disks);
2644 ioctl(fd, GET_ARRAY_INFO, &array);
2645 if (info->array.chunk_size == info->new_chunk &&
2646 reshape->before.layout == reshape->after.layout &&
2647 st->ss->external == 0) {
2648 /* use SET_ARRAY_INFO but only if reshape hasn't started */
2649 array.raid_disks = reshape->after.data_disks + reshape->parity;
2651 ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
2654 pr_err("Cannot set device shape for %s: %s\n",
2655 devname, strerror(errno));
2658 (array.state & (1<<MD_SB_BITMAP_PRESENT)))
2659 cont_err("Bitmap must be removed before shape can be changed\n");
2663 } else if (!restart) {
2664 /* set them all just in case some old 'new_*' value
2665 * persists from some earlier problem.
2668 if (sysfs_set_num(sra, NULL, "chunk_size", info->new_chunk) < 0)
2670 if (!err && sysfs_set_num(sra, NULL, "layout",
2671 reshape->after.layout) < 0)
2673 if (!err && subarray_set_num(container, sra, "raid_disks",
2674 reshape->after.data_disks +
2675 reshape->parity) < 0)
2678 pr_err("Cannot set device shape for %s\n",
2682 (array.state & (1<<MD_SB_BITMAP_PRESENT)))
2683 cont_err("Bitmap must be removed before shape can be changed\n");
2692 static int impose_level(int fd, int level, char *devname, int verbose)
2695 struct mdu_array_info_s array;
2697 sysfs_init(&info, fd, NULL);
2699 ioctl(fd, GET_ARRAY_INFO, &array);
2701 (array.level >= 4 && array.level <= 6)) {
2702 /* To convert to RAID0 we need to fail and
2703 * remove any non-data devices. */
2706 int data_disks = array.raid_disks - 1;
2707 if (array.level == 6)
2709 if (array.level == 5 &&
2710 array.layout != ALGORITHM_PARITY_N)
2712 if (array.level == 6 &&
2713 array.layout != ALGORITHM_PARITY_N_6)
2715 sysfs_set_str(&info, NULL,"sync_action", "idle");
2716 /* First remove any spares so no recovery starts */
2717 for (d = 0, found = 0;
2718 d < MAX_DISKS && found < array.nr_disks;
2720 mdu_disk_info_t disk;
2722 if (ioctl(fd, GET_DISK_INFO, &disk) < 0)
2724 if (disk.major == 0 && disk.minor == 0)
2727 if ((disk.state & (1 << MD_DISK_ACTIVE))
2728 && disk.raid_disk < data_disks)
2731 ioctl(fd, HOT_REMOVE_DISK,
2732 makedev(disk.major, disk.minor));
2734 /* Now fail anything left */
2735 ioctl(fd, GET_ARRAY_INFO, &array);
2736 for (d = 0, found = 0;
2737 d < MAX_DISKS && found < array.nr_disks;
2740 mdu_disk_info_t disk;
2742 if (ioctl(fd, GET_DISK_INFO, &disk) < 0)
2744 if (disk.major == 0 && disk.minor == 0)
2747 if ((disk.state & (1 << MD_DISK_ACTIVE))
2748 && disk.raid_disk < data_disks)
2751 ioctl(fd, SET_DISK_FAULTY,
2752 makedev(disk.major, disk.minor));
2754 while (ioctl(fd, HOT_REMOVE_DISK,
2755 makedev(disk.major, disk.minor)) < 0
2762 c = map_num(pers, level);
2764 int err = sysfs_set_str(&info, NULL, "level", c);
2767 pr_err("%s: could not set level to %s\n",
2770 (array.state & (1<<MD_SB_BITMAP_PRESENT)))
2771 cont_err("Bitmap must be removed before level can be changed\n");
2775 pr_err("level of %s changed to %s\n",
2782 static void catch_term(int sig)
2787 static int continue_via_systemd(char *devnm)
2789 int skipped, i, pid, status;
2791 /* In a systemd/udev world, it is best to get systemd to
2792 * run "mdadm --grow --continue" rather than running in the
2797 /* FIXME yuk. CLOSE_EXEC?? */
2799 for (i = 3; skipped < 20; i++)
2805 /* Don't want to see error messages from
2806 * systemctl. If the service doesn't exist,
2807 * we fork ourselves.
2810 open("/dev/null", O_WRONLY);
2811 snprintf(pathbuf, sizeof(pathbuf), "mdadm-grow-continue@%s.service",
2813 status = execl("/usr/bin/systemctl", "systemctl",
2816 status = execl("/bin/systemctl", "systemctl", "start",
2819 case -1: /* Just do it ourselves. */
2821 default: /* parent - good */
2822 pid = wait(&status);
2823 if (pid >= 0 && status == 0)
2829 static int reshape_array(char *container, int fd, char *devname,
2830 struct supertype *st, struct mdinfo *info,
2831 int force, struct mddev_dev *devlist,
2832 unsigned long long data_offset,
2833 char *backup_file, int verbose, int forked,
2834 int restart, int freeze_reshape)
2836 struct reshape reshape;
2839 int orig_level = UnSet;
2843 struct mdu_array_info_s array;
2846 struct mddev_dev *dv;
2850 unsigned long long *offsets = NULL;
2854 unsigned long blocks;
2855 unsigned long long array_size;
2857 struct mdinfo *sra = NULL;
2860 /* when reshaping a RAID0, the component_size might be zero.
2861 * So try to fix that up.
2863 if (ioctl(fd, GET_ARRAY_INFO, &array) != 0) {
2864 dprintf("Cannot get array information.\n");
2867 if (array.level == 0 && info->component_size == 0) {
2868 get_dev_size(fd, NULL, &array_size);
2869 info->component_size = array_size / array.raid_disks;
2872 if (array.level == 10)
2873 /* Need space_after info */
2874 get_space_after(fd, st, info);
2876 if (info->reshape_active) {
2877 int new_level = info->new_level;
2878 info->new_level = UnSet;
2879 if (info->delta_disks > 0)
2880 info->array.raid_disks -= info->delta_disks;
2881 msg = analyse_change(devname, info, &reshape);
2882 info->new_level = new_level;
2883 if (info->delta_disks > 0)
2884 info->array.raid_disks += info->delta_disks;
2886 /* Make sure the array isn't read-only */
2887 ioctl(fd, RESTART_ARRAY_RW, 0);
2889 msg = analyse_change(devname, info, &reshape);
2891 /* if msg == "", error has already been printed */
2893 pr_err("%s\n", msg);
2897 (reshape.level != info->array.level ||
2898 reshape.before.layout != info->array.layout ||
2899 reshape.before.data_disks + reshape.parity
2900 != info->array.raid_disks - max(0, info->delta_disks))) {
2901 pr_err("reshape info is not in native format - cannot continue.\n");
2905 if (st->ss->external && restart && (info->reshape_progress == 0) &&
2906 !((sysfs_get_str(info, NULL, "sync_action", buf, sizeof(buf)) > 0) &&
2907 (strncmp(buf, "reshape", 7) == 0))) {
2908 /* When reshape is restarted from '0', very begin of array
2909 * it is possible that for external metadata reshape and array
2910 * configuration doesn't happen.
2911 * Check if md has the same opinion, and reshape is restarted
2912 * from 0. If so, this is regular reshape start after reshape
2913 * switch in metadata to next array only.
2915 if ((verify_reshape_position(info, reshape.level) >= 0) &&
2916 (info->reshape_progress == 0))
2920 /* reshape already started. just skip to monitoring the reshape */
2921 if (reshape.backup_blocks == 0)
2923 if (restart & RESHAPE_NO_BACKUP)
2926 /* Need 'sra' down at 'started:' */
2927 sra = sysfs_read(fd, NULL,
2928 GET_COMPONENT|GET_DEVS|GET_OFFSET|GET_STATE|GET_CHUNK|
2931 pr_err("%s: Cannot get array details from sysfs\n",
2937 backup_file = locate_backup(sra->sys_name);
2941 /* The container is frozen but the array may not be.
2942 * So freeze the array so spares don't get put to the wrong use
2943 * FIXME there should probably be a cleaner separation between
2944 * freeze_array and freeze_container.
2946 sysfs_freeze_array(info);
2947 /* Check we have enough spares to not be degraded */
2949 for (dv = devlist; dv ; dv=dv->next)
2951 spares_needed = max(reshape.before.data_disks,
2952 reshape.after.data_disks)
2953 + reshape.parity - array.raid_disks;
2956 info->new_level > 1 && info->array.level > 1 &&
2957 spares_needed > info->array.spare_disks + added_disks) {
2958 pr_err("Need %d spare%s to avoid degraded array, and only have %d.\n"
2959 " Use --force to over-ride this check.\n",
2961 spares_needed == 1 ? "" : "s",
2962 info->array.spare_disks + added_disks);
2965 /* Check we have enough spares to not fail */
2966 spares_needed = max(reshape.before.data_disks,
2967 reshape.after.data_disks)
2969 if ((info->new_level > 1 || info->new_level == 0) &&
2970 spares_needed > info->array.spare_disks +added_disks) {
2971 pr_err("Need %d spare%s to create working array, and only have %d.\n",
2973 spares_needed == 1 ? "" : "s",
2974 info->array.spare_disks + added_disks);
2978 if (reshape.level != array.level) {
2979 int err = impose_level(fd, reshape.level, devname, verbose);
2982 info->new_layout = UnSet; /* after level change,
2983 * layout is meaningless */
2984 orig_level = array.level;
2985 sysfs_freeze_array(info);
2987 if (reshape.level > 0 && st->ss->external) {
2988 /* make sure mdmon is aware of the new level */
2989 if (mdmon_running(container))
2990 flush_mdmon(container);
2992 if (!mdmon_running(container))
2993 start_mdmon(container);
2994 ping_monitor(container);
2995 if (mdmon_running(container) &&
2996 st->update_tail == NULL)
2997 st->update_tail = &st->updates;
3000 /* ->reshape_super might have chosen some spares from the
3001 * container that it wants to be part of the new array.
3002 * We can collect them with ->container_content and give
3003 * them to the kernel.
3005 if (st->ss->reshape_super && st->ss->container_content) {
3006 char *subarray = strchr(info->text_version+1, '/')+1;
3007 struct mdinfo *info2 =
3008 st->ss->container_content(st, subarray);
3012 sysfs_init(info2, fd, st->devnm);
3013 /* When increasing number of devices, we need to set
3014 * new raid_disks before adding these, or they might
3017 if (reshape.backup_blocks &&
3018 reshape.after.data_disks > reshape.before.data_disks)
3019 subarray_set_num(container, info2, "raid_disks",
3020 reshape.after.data_disks +
3022 for (d = info2->devs; d; d = d->next) {
3023 if (d->disk.state == 0 &&
3024 d->disk.raid_disk >= 0) {
3025 /* This is a spare that wants to
3026 * be part of the array.
3028 add_disk(fd, st, info2, d);
3034 /* We might have been given some devices to add to the
3035 * array. Now that the array has been changed to the right
3036 * level and frozen, we can safely add them.
3039 if (Manage_subdevs(devname, fd, devlist, verbose,
3044 if (reshape.backup_blocks == 0 && data_offset != INVALID_SECTORS)
3045 reshape.backup_blocks = reshape.before.data_disks * info->array.chunk_size/512;
3046 if (reshape.backup_blocks == 0) {
3047 /* No restriping needed, but we might need to impose
3048 * some more changes: layout, raid_disks, chunk_size
3050 /* read current array info */
3051 if (ioctl(fd, GET_ARRAY_INFO, &array) != 0) {
3052 dprintf("Cannot get array information.\n");
3055 /* compare current array info with new values and if
3056 * it is different update them to new */
3057 if (info->new_layout != UnSet &&
3058 info->new_layout != array.layout) {
3059 array.layout = info->new_layout;
3060 if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
3061 pr_err("failed to set new layout\n");
3063 } else if (verbose >= 0)
3064 printf("layout for %s set to %d\n",
3065 devname, array.layout);
3067 if (info->delta_disks != UnSet &&
3068 info->delta_disks != 0 &&
3069 array.raid_disks != (info->array.raid_disks + info->delta_disks)) {
3070 array.raid_disks += info->delta_disks;
3071 if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
3072 pr_err("failed to set raid disks\n");
3074 } else if (verbose >= 0) {
3075 printf("raid_disks for %s set to %d\n",
3076 devname, array.raid_disks);
3079 if (info->new_chunk != 0 &&
3080 info->new_chunk != array.chunk_size) {
3081 if (sysfs_set_num(info, NULL,
3082 "chunk_size", info->new_chunk) != 0) {
3083 pr_err("failed to set chunk size\n");
3085 } else if (verbose >= 0)
3086 printf("chunk size for %s set to %d\n",
3087 devname, array.chunk_size);
3094 * There are three possibilities.
3095 * 1/ The array will shrink.
3096 * We need to ensure the reshape will pause before reaching
3097 * the 'critical section'. We also need to fork and wait for
3098 * that to happen. When it does we
3099 * suspend/backup/complete/unfreeze
3101 * 2/ The array will not change size.
3102 * This requires that we keep a backup of a sliding window
3103 * so that we can restore data after a crash. So we need
3104 * to fork and monitor progress.
3105 * In future we will allow the data_offset to change, so
3106 * a sliding backup becomes unnecessary.
3108 * 3/ The array will grow. This is relatively easy.
3109 * However the kernel's restripe routines will cheerfully
3110 * overwrite some early data before it is safe. So we
3111 * need to make a backup of the early parts of the array
3112 * and be ready to restore it if rebuild aborts very early.
3113 * For externally managed metadata, we still need a forked
3114 * child to monitor the reshape and suspend IO over the region
3115 * that is being reshaped.
3117 * We backup data by writing it to one spare, or to a
3118 * file which was given on command line.
3120 * In each case, we first make sure that storage is available
3121 * for the required backup.
3123 * - request the shape change.
3124 * - fork to handle backup etc.
3126 /* Check that we can hold all the data */
3127 get_dev_size(fd, NULL, &array_size);
3128 if (reshape.new_size < (array_size/512)) {
3129 pr_err("this change will reduce the size of the array.\n"
3130 " use --grow --array-size first to truncate array.\n"
3131 " e.g. mdadm --grow %s --array-size %llu\n",
3132 devname, reshape.new_size/2);
3136 if (array.level == 10) {
3137 /* Reshaping RAID10 does not require any data backup by
3138 * user-space. Instead it requires that the data_offset
3139 * is changed to avoid the need for backup.
3140 * So this is handled very separately
3143 /* Nothing to do. */
3145 return raid10_reshape(container, fd, devname, st, info,
3146 &reshape, data_offset,
3149 sra = sysfs_read(fd, NULL,
3150 GET_COMPONENT|GET_DEVS|GET_OFFSET|GET_STATE|GET_CHUNK|
3153 pr_err("%s: Cannot get array details from sysfs\n",
3159 switch(set_new_data_offset(sra, st, devname,
3160 reshape.after.data_disks - reshape.before.data_disks,
3162 reshape.min_offset_change, 1)) {
3166 /* Updated data_offset, so it's easy now */
3167 update_cache_size(container, sra, info,
3168 min(reshape.before.data_disks,
3169 reshape.after.data_disks),
3170 reshape.backup_blocks);
3172 /* Right, everything seems fine. Let's kick things off.
3176 if (impose_reshape(sra, info, st, fd, restart,
3177 devname, container, &reshape) < 0)
3179 if (sysfs_set_str(sra, NULL, "sync_action", "reshape") < 0) {
3181 if (errno != EINVAL) {
3182 pr_err("Failed to initiate reshape!\n");
3185 /* revert data_offset and try the old way */
3186 for (sd = sra->devs; sd; sd = sd->next) {
3187 sysfs_set_num(sra, sd, "new_offset",
3189 sysfs_set_str(sra, NULL, "reshape_direction",
3194 if (info->new_level == reshape.level)
3196 /* need to adjust level when reshape completes */
3198 case -1: /* ignore error, but don't wait */
3200 default: /* parent */
3208 fd = open_dev(sra->sys_name);
3210 impose_level(fd, info->new_level, devname, verbose);
3212 case 1: /* Couldn't set data_offset, try the old way */
3213 if (data_offset != INVALID_SECTORS) {
3214 pr_err("Cannot update data_offset on this array\n");
3221 /* Decide how many blocks (sectors) for a reshape
3222 * unit. The number we have so far is just a minimum
3224 blocks = reshape.backup_blocks;
3225 if (reshape.before.data_disks ==
3226 reshape.after.data_disks) {
3227 /* Make 'blocks' bigger for better throughput, but
3228 * not so big that we reject it below.
3229 * Try for 16 megabytes
3231 while (blocks * 32 < sra->component_size &&
3235 pr_err("Need to backup %luK of critical section..\n", blocks/2);
3237 if (blocks >= sra->component_size/2) {
3238 pr_err("%s: Something wrong - reshape aborted\n",
3243 /* Now we need to open all these devices so we can read/write.
3245 nrdisks = max(reshape.before.data_disks,
3246 reshape.after.data_disks) + reshape.parity
3247 + sra->array.spare_disks;
3248 fdlist = xcalloc((1+nrdisks), sizeof(int));
3249 offsets = xcalloc((1+nrdisks), sizeof(offsets[0]));
3251 odisks = reshape.before.data_disks + reshape.parity;
3252 d = reshape_prepare_fdlist(devname, sra, odisks,
3253 nrdisks, blocks, backup_file,
3258 if ((st->ss->manage_reshape == NULL) ||
3259 (st->ss->recover_backup == NULL)) {
3260 if (backup_file == NULL) {
3261 if (reshape.after.data_disks <=
3262 reshape.before.data_disks) {
3263 pr_err("%s: Cannot grow - need backup-file\n",
3265 pr_err(" Please provide one with \"--backup=...\"\n");
3267 } else if (d == odisks) {
3268 pr_err("%s: Cannot grow - need a spare or backup-file to backup critical section\n", devname);
3272 if (!reshape_open_backup_file(backup_file, fd, devname,
3274 fdlist+d, offsets+d,
3283 update_cache_size(container, sra, info,
3284 min(reshape.before.data_disks, reshape.after.data_disks),
3287 /* Right, everything seems fine. Let's kick things off.
3288 * If only changing raid_disks, use ioctl, else use
3293 if (impose_reshape(sra, info, st, fd, restart,
3294 devname, container, &reshape) < 0)
3297 err = start_reshape(sra, restart, reshape.before.data_disks,
3298 reshape.after.data_disks);
3300 pr_err("Cannot %s reshape for %s\n",
3301 restart ? "continue" : "start",
3306 sysfs_set_str(sra, NULL, "array_state", "active");
3307 if (freeze_reshape) {
3311 pr_err("Reshape has to be continued from location %llu when root filesystem has been mounted.\n",
3312 sra->reshape_progress);
3316 if (!forked && !check_env("MDADM_NO_SYSTEMCTL"))
3317 if (continue_via_systemd(container ?: sra->sys_name)) {
3324 /* Now we just need to kick off the reshape and watch, while
3325 * handling backups of the data...
3326 * This is all done by a forked background process.
3328 switch(forked ? 0 : fork()) {
3330 pr_err("Cannot run child to monitor reshape: %s\n",
3344 /* If another array on the same devices is busy, the
3345 * reshape will wait for them. This would mean that
3346 * the first section that we suspend will stay suspended
3347 * for a long time. So check on that possibility
3348 * by looking for "DELAYED" in /proc/mdstat, and if found,
3352 struct mdstat_ent *mds, *m;
3354 mds = mdstat_read(1, 0);
3355 for (m = mds; m; m = m->next)
3356 if (strcmp(m->devnm, sra->sys_name) == 0) {
3358 m->percent == RESYNC_DELAYED)
3361 /* Haven't started the reshape thread
3368 if (delayed == 1 && get_linux_version() < 3007000) {
3369 pr_err("Reshape is delayed, but cannot wait carefully with this kernel.\n"
3370 " You might experience problems until other reshapes complete.\n");
3374 mdstat_wait(30 - (delayed-1) * 25);
3378 if (check_env("MDADM_GROW_VERIFY"))
3379 fd = open(devname, O_RDONLY | O_DIRECT);
3382 mlockall(MCL_FUTURE);
3384 signal(SIGTERM, catch_term);
3386 if (st->ss->external) {
3387 /* metadata handler takes it from here */
3388 done = st->ss->manage_reshape(
3389 fd, sra, &reshape, st, blocks,
3391 d - odisks, fdlist+odisks,
3394 done = child_monitor(
3395 fd, sra, &reshape, st, blocks,
3397 d - odisks, fdlist+odisks,
3403 if (backup_file && done) {
3405 bul = make_backup(sra->sys_name);
3408 int l = readlink(bul, buf, sizeof(buf) - 1);
3416 unlink(backup_file);
3423 if (!st->ss->external &&
3424 !(reshape.before.data_disks != reshape.after.data_disks
3425 && info->custom_array_size) &&
3426 info->new_level == reshape.level &&
3428 /* no need to wait for the reshape to finish as
3429 * there is nothing more to do.
3436 if (st->ss->external) {
3437 /* Re-load the metadata as much could have changed */
3438 int cfd = open_dev(st->container_devnm);
3440 flush_mdmon(container);
3441 st->ss->free_super(st);
3442 st->ss->load_container(st, cfd, container);
3447 /* set new array size if required customer_array_size is used
3450 if (reshape.before.data_disks !=
3451 reshape.after.data_disks &&
3452 info->custom_array_size)
3453 set_array_size(st, info, info->text_version);
3455 if (info->new_level != reshape.level) {
3457 fd = open(devname, O_RDONLY);
3458 impose_level(fd, info->new_level, devname, verbose);
3460 if (info->new_level == 0)
3461 st->update_tail = NULL;
3473 if (orig_level != UnSet && sra) {
3474 c = map_num(pers, orig_level);
3475 if (c && sysfs_set_str(sra, NULL, "level", c) == 0)
3476 pr_err("aborting level change\n");
3484 /* mdfd handle is passed to be closed in child process (after fork).
3486 int reshape_container(char *container, char *devname,
3488 struct supertype *st,
3489 struct mdinfo *info,
3491 char *backup_file, int verbose,
3492 int forked, int restart, int freeze_reshape)
3494 struct mdinfo *cc = NULL;
3496 char last_devnm[32] = "";
3498 /* component_size is not meaningful for a container,
3499 * so pass '0' meaning 'no change'
3502 reshape_super(st, 0, info->new_level,
3503 info->new_layout, info->new_chunk,
3504 info->array.raid_disks, info->delta_disks,
3505 backup_file, devname, APPLY_METADATA_CHANGES,
3513 /* ping monitor to be sure that update is on disk
3515 ping_monitor(container);
3517 if (!forked && !freeze_reshape && !check_env("MDADM_NO_SYSTEMCTL"))
3518 if (continue_via_systemd(container))
3521 switch (forked ? 0 : fork()) {
3522 case -1: /* error */
3523 perror("Cannot fork to complete reshape\n");
3526 default: /* parent */
3527 if (!freeze_reshape)
3528 printf("%s: multi-array reshape continues in background\n", Name);
3535 /* close unused handle in child process
3541 /* For each member array with reshape_active,
3542 * we need to perform the reshape.
3543 * We pick the first array that needs reshaping and
3544 * reshape it. reshape_array() will re-read the metadata
3545 * so the next time through a different array should be
3546 * ready for reshape.
3547 * It is possible that the 'different' array will not
3548 * be assembled yet. In that case we simple exit.
3549 * When it is assembled, the mdadm which assembles it
3550 * will take over the reshape.
3552 struct mdinfo *content;
3554 struct mdstat_ent *mdstat;
3560 cc = st->ss->container_content(st, NULL);
3562 for (content = cc; content ; content = content->next) {
3564 if (!content->reshape_active)
3567 subarray = strchr(content->text_version+1, '/')+1;
3568 mdstat = mdstat_by_subdev(subarray, container);
3571 if (mdstat->active == 0) {
3572 pr_err("Skipping inactive array %s.\n",
3574 free_mdstat(mdstat);
3583 devid = devnm2devid(mdstat->devnm);
3584 adev = map_dev(major(devid), minor(devid), 0);
3586 adev = content->text_version;
3588 fd = open_dev(mdstat->devnm);
3590 pr_err("Device %s cannot be opened for reshape.\n", adev);
3594 if (strcmp(last_devnm, mdstat->devnm) == 0) {
3595 /* Do not allow for multiple reshape_array() calls for
3597 * It can happen when reshape_array() returns without
3598 * error, when reshape is not finished (wrong reshape
3599 * starting/continuation conditions). Mdmon doesn't
3600 * switch to next array in container and reentry
3601 * conditions for the same array occur.
3602 * This is possibly interim until the behaviour of
3603 * reshape_array is resolved().
3605 printf("%s: Multiple reshape execution detected for device %s.\n", Name, adev);
3609 strcpy(last_devnm, mdstat->devnm);
3611 sysfs_init(content, fd, mdstat->devnm);
3613 if (mdmon_running(container))
3614 flush_mdmon(container);
3616 rv = reshape_array(container, fd, adev, st,
3617 content, force, NULL, INVALID_SECTORS,
3618 backup_file, verbose, 1, restart,
3622 if (freeze_reshape) {
3631 if (mdmon_running(container))
3632 flush_mdmon(container);
3641 * We run a child process in the background which performs the following
3643 * - wait for resync to reach a certain point
3644 * - suspend io to the following section
3645 * - backup that section
3646 * - allow resync to proceed further
3648 * - discard the backup.
3650 * When are combined in slightly different ways in the three cases.
3652 * - suspend/backup/allow/wait/resume/discard
3654 * - allow/wait/suspend/backup/allow/wait/resume/discard
3656 * - wait/resume/discard/suspend/backup/allow
3658 * suspend/backup/allow always come together
3659 * wait/resume/discard do too.
3660 * For the same-size case we have two backups to improve flow.
3664 int progress_reshape(struct mdinfo *info, struct reshape *reshape,
3665 unsigned long long backup_point,
3666 unsigned long long wait_point,
3667 unsigned long long *suspend_point,
3668 unsigned long long *reshape_completed, int *frozen)
3670 /* This function is called repeatedly by the reshape manager.
3671 * It determines how much progress can safely be made and allows
3673 * - 'info' identifies the array and particularly records in
3674 * ->reshape_progress the metadata's knowledge of progress
3675 * This is a sector offset from the start of the array
3676 * of the next array block to be relocated. This number
3677 * may increase from 0 or decrease from array_size, depending
3678 * on the type of reshape that is happening.
3679 * Note that in contrast, 'sync_completed' is a block count of the
3680 * reshape so far. It gives the distance between the start point
3681 * (head or tail of device) and the next place that data will be
3682 * written. It always increases.
3683 * - 'reshape' is the structure created by analyse_change
3684 * - 'backup_point' shows how much the metadata manager has backed-up
3685 * data. For reshapes with increasing progress, it is the next address
3686 * to be backed up, previous addresses have been backed-up. For
3687 * decreasing progress, it is the earliest address that has been
3688 * backed up - later address are also backed up.
3689 * So addresses between reshape_progress and backup_point are
3690 * backed up providing those are in the 'correct' order.
3691 * - 'wait_point' is an array address. When reshape_completed
3692 * passes this point, progress_reshape should return. It might
3693 * return earlier if it determines that ->reshape_progress needs
3694 * to be updated or further backup is needed.
3695 * - suspend_point is maintained by progress_reshape and the caller
3696 * should not touch it except to initialise to zero.
3697 * It is an array address and it only increases in 2.6.37 and earlier.
3698 * This makes it difficult to handle reducing reshapes with
3699 * external metadata.
3700 * However: it is similar to backup_point in that it records the
3701 * other end of a suspended region from reshape_progress.
3702 * it is moved to extend the region that is safe to backup and/or
3704 * - reshape_completed is read from sysfs and returned. The caller
3705 * should copy this into ->reshape_progress when it has reason to
3706 * believe that the metadata knows this, and any backup outside this
3710 * 1 if more data from backup_point - but only as far as suspend_point,
3711 * should be backed up
3712 * 0 if things are progressing smoothly
3713 * -1 if the reshape is finished because it is all done,
3714 * -2 if the reshape is finished due to an error.
3717 int advancing = (reshape->after.data_disks
3718 >= reshape->before.data_disks);
3719 unsigned long long need_backup; /* All data between start of array and
3720 * here will at some point need to
3723 unsigned long long read_offset, write_offset;
3724 unsigned long long write_range;
3725 unsigned long long max_progress, target, completed;
3726 unsigned long long array_size = (info->component_size
3727 * reshape->before.data_disks);
3731 /* First, we unsuspend any region that is now known to be safe.
3732 * If suspend_point is on the 'wrong' side of reshape_progress, then
3733 * we don't have or need suspension at the moment. This is true for
3734 * native metadata when we don't need to back-up.
3737 if (info->reshape_progress <= *suspend_point)
3738 sysfs_set_num(info, NULL, "suspend_lo",
3739 info->reshape_progress);
3741 /* Note: this won't work in 2.6.37 and before.
3742 * Something somewhere should make sure we don't need it!
3744 if (info->reshape_progress >= *suspend_point)
3745 sysfs_set_num(info, NULL, "suspend_hi",
3746 info->reshape_progress);
3749 /* Now work out how far it is safe to progress.
3750 * If the read_offset for ->reshape_progress is less than
3751 * 'blocks' beyond the write_offset, we can only progress as far
3753 * Otherwise we can progress until the write_offset for the new location
3754 * reaches (within 'blocks' of) the read_offset at the current location.
3755 * However that region must be suspended unless we are using native
3757 * If we need to suspend more, we limit it to 128M per device, which is
3758 * rather arbitrary and should be some time-based calculation.
3760 read_offset = info->reshape_progress / reshape->before.data_disks;
3761 write_offset = info->reshape_progress / reshape->after.data_disks;
3762 write_range = info->new_chunk/512;
3763 if (reshape->before.data_disks == reshape->after.data_disks)
3764 need_backup = array_size;
3766 need_backup = reshape->backup_blocks;
3768 if (read_offset < write_offset + write_range)
3769 max_progress = backup_point;
3773 reshape->after.data_disks;
3775 if (read_offset > write_offset - write_range)
3776 /* Can only progress as far as has been backed up,
3777 * which must be suspended */
3778 max_progress = backup_point;
3779 else if (info->reshape_progress <= need_backup)
3780 max_progress = backup_point;
3782 if (info->array.major_version >= 0)
3783 /* Can progress until backup is needed */
3784 max_progress = need_backup;
3786 /* Can progress until metadata update is required */
3789 reshape->after.data_disks;
3790 /* but data must be suspended */
3791 if (max_progress < *suspend_point)
3792 max_progress = *suspend_point;
3797 /* We know it is safe to progress to 'max_progress' providing
3798 * it is suspended or we are using native metadata.
3799 * Consider extending suspend_point 128M per device if it
3800 * is less than 64M per device beyond reshape_progress.
3801 * But always do a multiple of 'blocks'
3802 * FIXME this is too big - it takes to long to complete
3805 target = 64*1024*2 * min(reshape->before.data_disks,
3806 reshape->after.data_disks);
3807 target /= reshape->backup_blocks;
3810 target *= reshape->backup_blocks;
3812 /* For externally managed metadata we always need to suspend IO to
3813 * the area being reshaped so we regularly push suspend_point forward.
3814 * For native metadata we only need the suspend if we are going to do
3818 if ((need_backup > info->reshape_progress
3819 || info->array.major_version < 0) &&
3820 *suspend_point < info->reshape_progress + target) {
3821 if (need_backup < *suspend_point + 2 * target)
3822 *suspend_point = need_backup;
3823 else if (*suspend_point + 2 * target < array_size)
3824 *suspend_point += 2 * target;
3826 *suspend_point = array_size;
3827 sysfs_set_num(info, NULL, "suspend_hi", *suspend_point);
3828 if (max_progress > *suspend_point)
3829 max_progress = *suspend_point;
3832 if (info->array.major_version >= 0) {
3833 /* Only need to suspend when about to backup */
3834 if (info->reshape_progress < need_backup * 2 &&
3835 *suspend_point > 0) {
3837 sysfs_set_num(info, NULL, "suspend_lo", 0);
3838 sysfs_set_num(info, NULL, "suspend_hi", need_backup);
3841 /* Need to suspend continually */
3842 if (info->reshape_progress < *suspend_point)
3843 *suspend_point = info->reshape_progress;
3844 if (*suspend_point + target < info->reshape_progress)
3845 /* No need to move suspend region yet */;
3847 if (*suspend_point >= 2 * target)
3848 *suspend_point -= 2 * target;
3851 sysfs_set_num(info, NULL, "suspend_lo",
3854 if (max_progress < *suspend_point)
3855 max_progress = *suspend_point;
3859 /* now set sync_max to allow that progress. sync_max, like
3860 * sync_completed is a count of sectors written per device, so
3861 * we find the difference between max_progress and the start point,
3862 * and divide that by after.data_disks to get a sync_max
3864 * At the same time we convert wait_point to a similar number
3865 * for comparing against sync_completed.
3867 /* scale down max_progress to per_disk */
3868 max_progress /= reshape->after.data_disks;
3869 /* Round to chunk size as some kernels give an erroneously high number */
3870 max_progress /= info->new_chunk/512;
3871 max_progress *= info->new_chunk/512;
3872 /* And round to old chunk size as the kernel wants that */
3873 max_progress /= info->array.chunk_size/512;
3874 max_progress *= info->array.chunk_size/512;
3875 /* Limit progress to the whole device */
3876 if (max_progress > info->component_size)
3877 max_progress = info->component_size;
3878 wait_point /= reshape->after.data_disks;
3880 /* switch from 'device offset' to 'processed block count' */
3881 max_progress = info->component_size - max_progress;
3882 wait_point = info->component_size - wait_point;
3886 sysfs_set_num(info, NULL, "sync_max", max_progress);
3888 /* Now wait. If we have already reached the point that we were
3889 * asked to wait to, don't wait at all, else wait for any change.
3890 * We need to select on 'sync_completed' as that is the place that
3891 * notifications happen, but we are really interested in
3892 * 'reshape_position'
3894 fd = sysfs_get_fd(info, NULL, "sync_completed");
3896 goto check_progress;
3898 if (sysfs_fd_get_ll(fd, &completed) < 0)
3899 goto check_progress;
3901 while (completed < max_progress && completed < wait_point) {
3902 /* Check that sync_action is still 'reshape' to avoid
3903 * waiting forever on a dead array
3906 if (sysfs_get_str(info, NULL, "sync_action",
3908 strncmp(action, "reshape", 7) != 0)
3910 /* Some kernels reset 'sync_completed' to zero
3911 * before setting 'sync_action' to 'idle'.
3912 * So we need these extra tests.
3914 if (completed == 0 && advancing
3915 && strncmp(action, "idle", 4) == 0
3916 && info->reshape_progress > 0)
3918 if (completed == 0 && !advancing
3919 && strncmp(action, "idle", 4) == 0
3920 && info->reshape_progress < (info->component_size
3921 * reshape->after.data_disks))
3923 sysfs_wait(fd, NULL);
3924 if (sysfs_fd_get_ll(fd, &completed) < 0)
3925 goto check_progress;
3927 /* Some kernels reset 'sync_completed' to zero,
3928 * we need to have real point we are in md.
3929 * So in that case, read 'reshape_position' from sysfs.
3931 if (completed == 0) {
3932 unsigned long long reshapep;
3934 if (sysfs_get_str(info, NULL, "sync_action",
3936 strncmp(action, "idle", 4) == 0 &&
3937 sysfs_get_ll(info, NULL,
3938 "reshape_position", &reshapep) == 0)
3939 *reshape_completed = reshapep;
3941 /* some kernels can give an incorrectly high
3942 * 'completed' number, so round down */
3943 completed /= (info->new_chunk/512);
3944 completed *= (info->new_chunk/512);
3945 /* Convert 'completed' back in to a 'progress' number */
3946 completed *= reshape->after.data_disks;
3948 completed = (info->component_size
3949 * reshape->after.data_disks
3951 *reshape_completed = completed;
3956 /* We return the need_backup flag. Caller will decide
3957 * how much - a multiple of ->backup_blocks up to *suspend_point
3960 return need_backup > info->reshape_progress;
3962 return need_backup >= info->reshape_progress;
3965 /* if we couldn't read a number from sync_completed, then
3966 * either the reshape did complete, or it aborted.
3967 * We can tell which by checking for 'none' in reshape_position.
3968 * If it did abort, then it might immediately restart if it
3969 * it was just a device failure that leaves us degraded but
3972 if (sysfs_get_str(info, NULL, "reshape_position", buf, sizeof(buf)) < 0
3973 || strncmp(buf, "none", 4) != 0) {
3974 /* The abort might only be temporary. Wait up to 10
3975 * seconds for fd to contain a valid number again.
3979 unsigned long long new_sync_max;
3980 while (fd >= 0 && rv < 0 && wait > 0) {
3981 if (sysfs_wait(fd, &wait) != 1)
3983 switch (sysfs_fd_get_ll(fd, &completed)) {
3985 /* all good again */
3987 /* If "sync_max" is no longer max_progress
3988 * we need to freeze things
3990 sysfs_get_ll(info, NULL, "sync_max", &new_sync_max);
3991 *frozen = (new_sync_max != max_progress);
3993 case -2: /* read error - abort */
4000 return rv; /* abort */
4002 /* Maybe racing with array shutdown - check state */
4005 if (sysfs_get_str(info, NULL, "array_state", buf, sizeof(buf)) < 0
4006 || strncmp(buf, "inactive", 8) == 0
4007 || strncmp(buf, "clear",5) == 0)
4008 return -2; /* abort */
4009 return -1; /* complete */
4013 /* FIXME return status is never checked */
4014 static int grow_backup(struct mdinfo *sra,
4015 unsigned long long offset, /* per device */
4016 unsigned long stripes, /* per device, in old chunks */
4017 int *sources, unsigned long long *offsets,
4018 int disks, int chunk, int level, int layout,
4019 int dests, int *destfd, unsigned long long *destoffsets,
4020 int part, int *degraded,
4023 /* Backup 'blocks' sectors at 'offset' on each device of the array,
4024 * to storage 'destfd' (offset 'destoffsets'), after first
4025 * suspending IO. Then allow resync to continue
4026 * over the suspended section.
4027 * Use part 'part' of the backup-super-block.
4032 unsigned long long ll;
4034 //printf("offset %llu\n", offset);
4040 /* Check that array hasn't become degraded, else we might backup the wrong data */
4041 if (sysfs_get_ll(sra, NULL, "degraded", &ll) < 0)
4042 return -1; /* FIXME this error is ignored */
4043 new_degraded = (int)ll;
4044 if (new_degraded != *degraded) {
4045 /* check each device to ensure it is still working */
4047 for (sd = sra->devs ; sd ; sd = sd->next) {
4048 if (sd->disk.state & (1<<MD_DISK_FAULTY))
4050 if (sd->disk.state & (1<<MD_DISK_SYNC)) {
4053 if (sysfs_get_str(sra, sd, "state",
4054 sbuf, sizeof(sbuf)) < 0 ||
4055 strstr(sbuf, "faulty") ||
4056 strstr(sbuf, "in_sync") == NULL) {
4057 /* this device is dead */
4058 sd->disk.state = (1<<MD_DISK_FAULTY);
4059 if (sd->disk.raid_disk >= 0 &&
4060 sources[sd->disk.raid_disk] >= 0) {
4061 close(sources[sd->disk.raid_disk]);
4062 sources[sd->disk.raid_disk] = -1;
4067 *degraded = new_degraded;
4070 bsb.arraystart2 = __cpu_to_le64(offset * odata);
4071 bsb.length2 = __cpu_to_le64(stripes * (chunk/512) * odata);
4073 bsb.arraystart = __cpu_to_le64(offset * odata);
4074 bsb.length = __cpu_to_le64(stripes * (chunk/512) * odata);
4077 bsb.magic[15] = '2';
4078 for (i = 0; i < dests; i++)
4080 lseek64(destfd[i], destoffsets[i] + __le64_to_cpu(bsb.devstart2)*512, 0);
4082 lseek64(destfd[i], destoffsets[i], 0);
4084 rv = save_stripes(sources, offsets,
4085 disks, chunk, level, layout,
4087 offset*512*odata, stripes * chunk * odata,
4092 bsb.mtime = __cpu_to_le64(time(0));
4093 for (i = 0; i < dests; i++) {
4094 bsb.devstart = __cpu_to_le64(destoffsets[i]/512);
4096 bsb.sb_csum = bsb_csum((char*)&bsb, ((char*)&bsb.sb_csum)-((char*)&bsb));
4097 if (memcmp(bsb.magic, "md_backup_data-2", 16) == 0)
4098 bsb.sb_csum2 = bsb_csum((char*)&bsb,
4099 ((char*)&bsb.sb_csum2)-((char*)&bsb));
4102 if ((unsigned long long)lseek64(destfd[i], destoffsets[i] - 4096, 0)
4103 != destoffsets[i] - 4096)
4105 if (write(destfd[i], &bsb, 512) != 512)
4107 if (destoffsets[i] > 4096) {
4108 if ((unsigned long long)lseek64(destfd[i], destoffsets[i]+stripes*chunk*odata, 0) !=
4109 destoffsets[i]+stripes*chunk*odata)
4111 if (write(destfd[i], &bsb, 512) != 512)
4121 /* in 2.6.30, the value reported by sync_completed can be
4122 * less that it should be by one stripe.
4123 * This only happens when reshape hits sync_max and pauses.
4124 * So allow wait_backup to either extent sync_max further
4125 * than strictly necessary, or return before the
4126 * sync has got quite as far as we would really like.
4127 * This is what 'blocks2' is for.
4128 * The various caller give appropriate values so that
4131 /* FIXME return value is often ignored */
4132 static int forget_backup(int dests, int *destfd,
4133 unsigned long long *destoffsets,
4137 * Erase backup 'part' (which is 0 or 1)
4143 bsb.arraystart2 = __cpu_to_le64(0);
4144 bsb.length2 = __cpu_to_le64(0);
4146 bsb.arraystart = __cpu_to_le64(0);
4147 bsb.length = __cpu_to_le64(0);
4149 bsb.mtime = __cpu_to_le64(time(0));
4151 for (i = 0; i < dests; i++) {
4152 bsb.devstart = __cpu_to_le64(destoffsets[i]/512);
4153 bsb.sb_csum = bsb_csum((char*)&bsb, ((char*)&bsb.sb_csum)-((char*)&bsb));
4154 if (memcmp(bsb.magic, "md_backup_data-2", 16) == 0)
4155 bsb.sb_csum2 = bsb_csum((char*)&bsb,
4156 ((char*)&bsb.sb_csum2)-((char*)&bsb));
4157 if ((unsigned long long)lseek64(destfd[i], destoffsets[i]-4096, 0) !=
4158 destoffsets[i]-4096)
4161 write(destfd[i], &bsb, 512) != 512)
4168 static void fail(char *msg)
4171 rv = (write(2, msg, strlen(msg)) != (int)strlen(msg));
4172 rv |= (write(2, "\n", 1) != 1);
4176 static char *abuf, *bbuf;
4177 static unsigned long long abuflen;
4178 static void validate(int afd, int bfd, unsigned long long offset)
4180 /* check that the data in the backup against the array.
4181 * This is only used for regression testing and should not
4182 * be used while the array is active
4186 lseek64(bfd, offset - 4096, 0);
4187 if (read(bfd, &bsb2, 512) != 512)
4188 fail("cannot read bsb");
4189 if (bsb2.sb_csum != bsb_csum((char*)&bsb2,
4190 ((char*)&bsb2.sb_csum)-((char*)&bsb2)))
4191 fail("first csum bad");
4192 if (memcmp(bsb2.magic, "md_backup_data", 14) != 0)
4193 fail("magic is bad");
4194 if (memcmp(bsb2.magic, "md_backup_data-2", 16) == 0 &&
4195 bsb2.sb_csum2 != bsb_csum((char*)&bsb2,
4196 ((char*)&bsb2.sb_csum2)-((char*)&bsb2)))
4197 fail("second csum bad");
4199 if (__le64_to_cpu(bsb2.devstart)*512 != offset)
4200 fail("devstart is wrong");
4203 unsigned long long len = __le64_to_cpu(bsb2.length)*512;
4205 if (abuflen < len) {
4209 if (posix_memalign((void**)&abuf, 4096, abuflen) ||
4210 posix_memalign((void**)&bbuf, 4096, abuflen)) {
4212 /* just stop validating on mem-alloc failure */
4217 lseek64(bfd, offset, 0);
4218 if ((unsigned long long)read(bfd, bbuf, len) != len) {
4219 //printf("len %llu\n", len);
4220 fail("read first backup failed");
4222 lseek64(afd, __le64_to_cpu(bsb2.arraystart)*512, 0);
4223 if ((unsigned long long)read(afd, abuf, len) != len)
4224 fail("read first from array failed");
4225 if (memcmp(bbuf, abuf, len) != 0) {
4228 printf("offset=%llu len=%llu\n",
4229 (unsigned long long)__le64_to_cpu(bsb2.arraystart)*512, len);
4230 for (i=0; i<len; i++)
4231 if (bbuf[i] != abuf[i]) {
4232 printf("first diff byte %d\n", i);
4236 fail("data1 compare failed");
4240 unsigned long long len = __le64_to_cpu(bsb2.length2)*512;
4242 if (abuflen < len) {
4246 abuf = xmalloc(abuflen);
4247 bbuf = xmalloc(abuflen);
4250 lseek64(bfd, offset+__le64_to_cpu(bsb2.devstart2)*512, 0);
4251 if ((unsigned long long)read(bfd, bbuf, len) != len)
4252 fail("read second backup failed");
4253 lseek64(afd, __le64_to_cpu(bsb2.arraystart2)*512, 0);
4254 if ((unsigned long long)read(afd, abuf, len) != len)
4255 fail("read second from array failed");
4256 if (memcmp(bbuf, abuf, len) != 0)
4257 fail("data2 compare failed");
4261 int child_monitor(int afd, struct mdinfo *sra, struct reshape *reshape,
4262 struct supertype *st, unsigned long blocks,
4263 int *fds, unsigned long long *offsets,
4264 int dests, int *destfd, unsigned long long *destoffsets)
4266 /* Monitor a reshape where backup is being performed using
4267 * 'native' mechanism - either to a backup file, or
4268 * to some space in a spare.
4272 unsigned long long speed;
4273 unsigned long long suspend_point, array_size;
4274 unsigned long long backup_point, wait_point;
4275 unsigned long long reshape_completed;
4277 int increasing = reshape->after.data_disks >= reshape->before.data_disks;
4278 int part = 0; /* The next part of the backup area to fill. It may already
4279 * be full, so we need to check */
4280 int level = reshape->level;
4281 int layout = reshape->before.layout;
4282 int data = reshape->before.data_disks;
4283 int disks = reshape->before.data_disks + reshape->parity;
4284 int chunk = sra->array.chunk_size;
4286 unsigned long stripes;
4290 /* set up the backup-super-block. This requires the
4291 * uuid from the array.
4293 /* Find a superblock */
4294 for (sd = sra->devs; sd; sd = sd->next) {
4298 if (sd->disk.state & (1<<MD_DISK_FAULTY))
4300 dn = map_dev(sd->disk.major, sd->disk.minor, 1);
4301 devfd = dev_open(dn, O_RDONLY);
4304 ok = st->ss->load_super(st, devfd, NULL);
4310 pr_err("Cannot find a superblock\n");
4314 memset(&bsb, 0, 512);
4315 memcpy(bsb.magic, "md_backup_data-1", 16);
4316 st->ss->uuid_from_super(st, uuid);
4317 memcpy(bsb.set_uuid, uuid, 16);
4318 bsb.mtime = __cpu_to_le64(time(0));
4319 bsb.devstart2 = blocks;
4321 stripes = blocks / (sra->array.chunk_size/512) /
4322 reshape->before.data_disks;
4324 if (posix_memalign((void**)&buf, 4096, disks * chunk))
4325 /* Don't start the 'reshape' */
4327 if (reshape->before.data_disks == reshape->after.data_disks) {
4328 sysfs_get_ll(sra, NULL, "sync_speed_min", &speed);
4329 sysfs_set_num(sra, NULL, "sync_speed_min", 200000);
4333 array_size = sra->component_size * reshape->after.data_disks;
4334 backup_point = sra->reshape_progress;
4337 array_size = sra->component_size * reshape->before.data_disks;
4338 backup_point = reshape->backup_blocks;
4339 suspend_point = array_size;
4345 /* Want to return as soon the oldest backup slot can
4346 * be released as that allows us to start backing up
4347 * some more, providing suspend_point has been
4348 * advanced, which it should have.
4351 wait_point = array_size;
4352 if (part == 0 && __le64_to_cpu(bsb.length) > 0)
4353 wait_point = (__le64_to_cpu(bsb.arraystart) +
4354 __le64_to_cpu(bsb.length));
4355 if (part == 1 && __le64_to_cpu(bsb.length2) > 0)
4356 wait_point = (__le64_to_cpu(bsb.arraystart2) +
4357 __le64_to_cpu(bsb.length2));
4360 if (part == 0 && __le64_to_cpu(bsb.length) > 0)
4361 wait_point = __le64_to_cpu(bsb.arraystart);
4362 if (part == 1 && __le64_to_cpu(bsb.length2) > 0)
4363 wait_point = __le64_to_cpu(bsb.arraystart2);
4366 reshape_completed = sra->reshape_progress;
4367 rv = progress_reshape(sra, reshape,
4368 backup_point, wait_point,
4369 &suspend_point, &reshape_completed,
4371 /* external metadata would need to ping_monitor here */
4372 sra->reshape_progress = reshape_completed;
4374 /* Clear any backup region that is before 'here' */
4376 if (__le64_to_cpu(bsb.length) > 0 &&
4377 reshape_completed >= (__le64_to_cpu(bsb.arraystart) +
4378 __le64_to_cpu(bsb.length)))
4379 forget_backup(dests, destfd,
4381 if (__le64_to_cpu(bsb.length2) > 0 &&
4382 reshape_completed >= (__le64_to_cpu(bsb.arraystart2) +
4383 __le64_to_cpu(bsb.length2)))
4384 forget_backup(dests, destfd,
4387 if (__le64_to_cpu(bsb.length) > 0 &&
4388 reshape_completed <= (__le64_to_cpu(bsb.arraystart)))
4389 forget_backup(dests, destfd,
4391 if (__le64_to_cpu(bsb.length2) > 0 &&
4392 reshape_completed <= (__le64_to_cpu(bsb.arraystart2)))
4393 forget_backup(dests, destfd,
4403 if (rv == 0 && increasing && !st->ss->external) {
4404 /* No longer need to monitor this reshape */
4405 sysfs_set_str(sra, NULL, "sync_max", "max");
4411 unsigned long long offset;
4412 unsigned long actual_stripes;
4413 /* Need to backup some data.
4414 * If 'part' is not used and the desired
4415 * backup size is suspended, do a backup,
4416 * then consider the next part.
4418 /* Check that 'part' is unused */
4419 if (part == 0 && __le64_to_cpu(bsb.length) != 0)
4421 if (part == 1 && __le64_to_cpu(bsb.length2) != 0)
4424 offset = backup_point / data;
4425 actual_stripes = stripes;
4427 if (offset + actual_stripes * (chunk/512) >
4428 sra->component_size)
4429 actual_stripes = ((sra->component_size - offset)
4431 if (offset + actual_stripes * (chunk/512) >
4435 if (offset < actual_stripes * (chunk/512))
4436 actual_stripes = offset / (chunk/512);
4437 offset -= actual_stripes * (chunk/512);
4438 if (offset < suspend_point/data)
4441 if (actual_stripes == 0)
4443 grow_backup(sra, offset, actual_stripes,
4445 disks, chunk, level, layout,
4446 dests, destfd, destoffsets,
4447 part, °raded, buf);
4448 validate(afd, destfd[0], destoffsets[0]);
4449 /* record where 'part' is up to */
4452 backup_point += actual_stripes * (chunk/512) * data;
4454 backup_point -= actual_stripes * (chunk/512) * data;
4458 /* FIXME maybe call progress_reshape one more time instead */
4459 /* remove any remaining suspension */
4460 sysfs_set_num(sra, NULL, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL);
4461 sysfs_set_num(sra, NULL, "suspend_hi", 0);
4462 sysfs_set_num(sra, NULL, "suspend_lo", 0);
4463 sysfs_set_num(sra, NULL, "sync_min", 0);
4465 if (reshape->before.data_disks == reshape->after.data_disks)
4466 sysfs_set_num(sra, NULL, "sync_speed_min", speed);
4472 * If any spare contains md_back_data-1 which is recent wrt mtime,
4473 * write that data into the array and update the super blocks with
4474 * the new reshape_progress
4476 int Grow_restart(struct supertype *st, struct mdinfo *info, int *fdlist, int cnt,
4477 char *backup_file, int verbose)
4481 unsigned long long *offsets;
4482 unsigned long long nstripe, ostripe;
4485 odata = info->array.raid_disks - info->delta_disks - 1;
4486 if (info->array.level == 6) odata--; /* number of data disks */
4487 ndata = info->array.raid_disks - 1;
4488 if (info->new_level == 6) ndata--;
4490 old_disks = info->array.raid_disks - info->delta_disks;
4492 if (info->delta_disks <= 0)
4493 /* Didn't grow, so the backup file must have
4497 for (i=old_disks-(backup_file?1:0); i<cnt; i++) {
4498 struct mdinfo dinfo;
4501 char *devname, namebuf[20];
4502 unsigned long long lo, hi;
4504 /* This was a spare and may have some saved data on it.
4505 * Load the superblock, find and load the
4506 * backup_super_block.
4507 * If either fail, go on to next device.
4508 * If the backup contains no new info, just return
4509 * else restore data and update all superblocks
4511 if (i == old_disks-1) {
4512 fd = open(backup_file, O_RDONLY);
4514 pr_err("backup file %s inaccessible: %s\n",
4515 backup_file, strerror(errno));
4518 devname = backup_file;
4523 if (st->ss->load_super(st, fd, NULL))
4526 st->ss->getinfo_super(st, &dinfo, NULL);
4527 st->ss->free_super(st);
4530 (dinfo.data_offset + dinfo.component_size - 8) <<9,
4532 pr_err("Cannot seek on device %d\n", i);
4533 continue; /* Cannot seek */
4535 sprintf(namebuf, "device-%d", i);
4538 if (read(fd, &bsb, sizeof(bsb)) != sizeof(bsb)) {
4540 pr_err("Cannot read from %s\n", devname);
4541 continue; /* Cannot read */
4543 if (memcmp(bsb.magic, "md_backup_data-1", 16) != 0 &&
4544 memcmp(bsb.magic, "md_backup_data-2", 16) != 0) {
4546 pr_err("No backup metadata on %s\n", devname);
4549 if (bsb.sb_csum != bsb_csum((char*)&bsb, ((char*)&bsb.sb_csum)-((char*)&bsb))) {
4551 pr_err("Bad backup-metadata checksum on %s\n", devname);
4552 continue; /* bad checksum */
4554 if (memcmp(bsb.magic, "md_backup_data-2", 16) == 0 &&
4555 bsb.sb_csum2 != bsb_csum((char*)&bsb, ((char*)&bsb.sb_csum2)-((char*)&bsb))) {
4557 pr_err("Bad backup-metadata checksum2 on %s\n", devname);
4558 continue; /* Bad second checksum */
4560 if (memcmp(bsb.set_uuid,info->uuid, 16) != 0) {
4562 pr_err("Wrong uuid on backup-metadata on %s\n", devname);
4563 continue; /* Wrong uuid */
4566 /* array utime and backup-mtime should be updated at much the same time, but it seems that
4567 * sometimes they aren't... So allow considerable flexability in matching, and allow
4568 * this test to be overridden by an environment variable.
4570 if(time_after(info->array.utime, (unsigned int)__le64_to_cpu(bsb.mtime) + 2*60*60) ||
4571 time_before(info->array.utime, (unsigned int)__le64_to_cpu(bsb.mtime) - 10*60)) {
4572 if (check_env("MDADM_GROW_ALLOW_OLD")) {
4573 pr_err("accepting backup with timestamp %lu for array with timestamp %lu\n",
4574 (unsigned long)__le64_to_cpu(bsb.mtime),
4575 (unsigned long)info->array.utime);
4577 pr_err("too-old timestamp on backup-metadata on %s\n", devname);
4578 pr_err("If you think it is should be safe, try 'export MDADM_GROW_ALLOW_OLD=1'\n");
4579 continue; /* time stamp is too bad */
4583 if (bsb.magic[15] == '1') {
4584 if (bsb.length == 0)
4586 if (info->delta_disks >= 0) {
4587 /* reshape_progress is increasing */
4588 if (__le64_to_cpu(bsb.arraystart)
4589 + __le64_to_cpu(bsb.length)
4590 < info->reshape_progress) {
4593 pr_err("backup-metadata found on %s but is not needed\n", devname);
4594 continue; /* No new data here */
4597 /* reshape_progress is decreasing */
4598 if (__le64_to_cpu(bsb.arraystart) >=
4599 info->reshape_progress)
4600 goto nonew; /* No new data here */
4603 if (bsb.length == 0 && bsb.length2 == 0)
4605 if (info->delta_disks >= 0) {
4606 /* reshape_progress is increasing */
4607 if ((__le64_to_cpu(bsb.arraystart)
4608 + __le64_to_cpu(bsb.length)
4609 < info->reshape_progress)
4611 (__le64_to_cpu(bsb.arraystart2)
4612 + __le64_to_cpu(bsb.length2)
4613 < info->reshape_progress))
4614 goto nonew; /* No new data here */
4616 /* reshape_progress is decreasing */
4617 if (__le64_to_cpu(bsb.arraystart) >=
4618 info->reshape_progress &&
4619 __le64_to_cpu(bsb.arraystart2) >=
4620 info->reshape_progress)
4621 goto nonew; /* No new data here */
4624 if (lseek64(fd, __le64_to_cpu(bsb.devstart)*512, 0)< 0) {
4627 pr_err("Failed to verify secondary backup-metadata block on %s\n",
4629 continue; /* Cannot seek */
4631 /* There should be a duplicate backup superblock 4k before here */
4632 if (lseek64(fd, -4096, 1) < 0 ||
4633 read(fd, &bsb2, sizeof(bsb2)) != sizeof(bsb2))
4634 goto second_fail; /* Cannot find leading superblock */
4635 if (bsb.magic[15] == '1')
4636 bsbsize = offsetof(struct mdp_backup_super, pad1);
4638 bsbsize = offsetof(struct mdp_backup_super, pad);
4639 if (memcmp(&bsb2, &bsb, bsbsize) != 0)
4640 goto second_fail; /* Cannot find leading superblock */
4642 /* Now need the data offsets for all devices. */
4643 offsets = xmalloc(sizeof(*offsets)*info->array.raid_disks);
4644 for(j=0; j<info->array.raid_disks; j++) {
4647 if (st->ss->load_super(st, fdlist[j], NULL))
4648 /* FIXME should be this be an error */
4650 st->ss->getinfo_super(st, &dinfo, NULL);
4651 st->ss->free_super(st);
4652 offsets[j] = dinfo.data_offset * 512;
4654 printf("%s: restoring critical section\n", Name);
4656 if (restore_stripes(fdlist, offsets,
4657 info->array.raid_disks,
4661 fd, __le64_to_cpu(bsb.devstart)*512,
4662 __le64_to_cpu(bsb.arraystart)*512,
4663 __le64_to_cpu(bsb.length)*512, NULL)) {
4664 /* didn't succeed, so giveup */
4666 pr_err("Error restoring backup from %s\n",
4672 if (bsb.magic[15] == '2' &&
4673 restore_stripes(fdlist, offsets,
4674 info->array.raid_disks,
4678 fd, __le64_to_cpu(bsb.devstart)*512 +
4679 __le64_to_cpu(bsb.devstart2)*512,
4680 __le64_to_cpu(bsb.arraystart2)*512,
4681 __le64_to_cpu(bsb.length2)*512, NULL)) {
4682 /* didn't succeed, so giveup */
4684 pr_err("Error restoring second backup from %s\n",
4692 /* Ok, so the data is restored. Let's update those superblocks. */
4696 lo = __le64_to_cpu(bsb.arraystart);
4697 hi = lo + __le64_to_cpu(bsb.length);
4699 if (bsb.magic[15] == '2' && bsb.length2) {
4700 unsigned long long lo1, hi1;
4701 lo1 = __le64_to_cpu(bsb.arraystart2);
4702 hi1 = lo1 + __le64_to_cpu(bsb.length2);
4706 } else if (lo < lo1)
4712 (info->reshape_progress < lo ||
4713 info->reshape_progress > hi))
4714 /* backup does not affect reshape_progress*/ ;
4715 else if (info->delta_disks >= 0) {
4716 info->reshape_progress = __le64_to_cpu(bsb.arraystart) +
4717 __le64_to_cpu(bsb.length);
4718 if (bsb.magic[15] == '2') {
4719 unsigned long long p2 = __le64_to_cpu(bsb.arraystart2) +
4720 __le64_to_cpu(bsb.length2);
4721 if (p2 > info->reshape_progress)
4722 info->reshape_progress = p2;
4725 info->reshape_progress = __le64_to_cpu(bsb.arraystart);
4726 if (bsb.magic[15] == '2') {
4727 unsigned long long p2 = __le64_to_cpu(bsb.arraystart2);
4728 if (p2 < info->reshape_progress)
4729 info->reshape_progress = p2;
4732 for (j=0; j<info->array.raid_disks; j++) {
4735 if (st->ss->load_super(st, fdlist[j], NULL))
4737 st->ss->getinfo_super(st, &dinfo, NULL);
4738 dinfo.reshape_progress = info->reshape_progress;
4739 st->ss->update_super(st, &dinfo,
4740 "_reshape_progress",
4742 st->ss->store_super(st, fdlist[j]);
4743 st->ss->free_super(st);
4747 /* Didn't find any backup data, try to see if any
4750 if (info->delta_disks < 0) {
4751 /* When shrinking, the critical section is at the end.
4752 * So see if we are before the critical section.
4754 unsigned long long first_block;
4755 nstripe = ostripe = 0;
4757 while (ostripe >= nstripe) {
4758 ostripe += info->array.chunk_size / 512;
4759 first_block = ostripe * odata;
4760 nstripe = first_block / ndata / (info->new_chunk/512) *
4761 (info->new_chunk/512);
4764 if (info->reshape_progress >= first_block)
4767 if (info->delta_disks > 0) {
4768 /* See if we are beyond the critical section. */
4769 unsigned long long last_block;
4770 nstripe = ostripe = 0;
4772 while (nstripe >= ostripe) {
4773 nstripe += info->new_chunk / 512;
4774 last_block = nstripe * ndata;
4775 ostripe = last_block / odata / (info->array.chunk_size/512) *
4776 (info->array.chunk_size/512);
4779 if (info->reshape_progress >= last_block)
4782 /* needed to recover critical section! */
4784 pr_err("Failed to find backup of critical section\n");
4788 int Grow_continue_command(char *devname, int fd,
4789 char *backup_file, int verbose)
4792 struct supertype *st = NULL;
4793 struct mdinfo *content = NULL;
4794 struct mdinfo array;
4795 char *subarray = NULL;
4796 struct mdinfo *cc = NULL;
4797 struct mdstat_ent *mdstat = NULL;
4801 dprintf("Grow continue from command line called for %s\n",
4804 st = super_by_fd(fd, &subarray);
4805 if (!st || !st->ss) {
4806 pr_err("Unable to determine metadata format for %s\n",
4810 dprintf("Grow continue is run for ");
4811 if (st->ss->external == 0) {
4814 dprintf_cont("native array (%s)\n", devname);
4815 if (ioctl(fd, GET_ARRAY_INFO, &array.array) < 0) {
4816 pr_err("%s is not an active md array - aborting\n", devname);
4818 goto Grow_continue_command_exit;
4821 /* Need to load a superblock.
4822 * FIXME we should really get what we need from
4826 for (d = 0; d < MAX_DISKS; d++) {
4827 mdu_disk_info_t disk;
4831 if (ioctl(fd, GET_DISK_INFO, &disk) < 0)
4833 if (disk.major == 0 && disk.minor == 0)
4835 if ((disk.state & (1 << MD_DISK_ACTIVE)) == 0)
4837 dv = map_dev(disk.major, disk.minor, 1);
4840 fd2 = dev_open(dv, O_RDONLY);
4843 err = st->ss->load_super(st, fd2, NULL);
4849 if (d == MAX_DISKS) {
4850 pr_err("Unable to load metadata for %s\n",
4853 goto Grow_continue_command_exit;
4855 st->ss->getinfo_super(st, content, NULL);
4856 if (!content->reshape_active)
4860 } while (cnt-- > 0);
4865 dprintf_cont("subarray (%s)\n", subarray);
4866 container = st->container_devnm;
4867 cfd = open_dev_excl(st->container_devnm);
4869 container = st->devnm;
4871 cfd = open_dev_excl(st->devnm);
4872 dprintf_cont("container (%s)\n", container);
4876 pr_err("Unable to open container for %s\n", devname);
4878 goto Grow_continue_command_exit;
4881 /* find in container array under reshape
4883 ret_val = st->ss->load_container(st, cfd, NULL);
4885 pr_err("Cannot read superblock for %s\n",
4888 goto Grow_continue_command_exit;
4891 cc = st->ss->container_content(st, subarray);
4892 for (content = cc; content ; content = content->next) {
4894 int allow_reshape = 1;
4896 if (content->reshape_active == 0)
4898 /* The decision about array or container wide
4899 * reshape is taken in Grow_continue based
4900 * content->reshape_active state, therefore we
4901 * need to check_reshape based on
4902 * reshape_active and subarray name
4904 if (content->array.state & (1<<MD_SB_BLOCK_VOLUME))
4906 if (content->reshape_active == CONTAINER_RESHAPE &&
4907 (content->array.state
4908 & (1<<MD_SB_BLOCK_CONTAINER_RESHAPE)))
4911 if (!allow_reshape) {
4912 pr_err("cannot continue reshape of an array in container with unsupported metadata: %s(%s)\n",
4913 devname, container);
4915 goto Grow_continue_command_exit;
4918 array = strchr(content->text_version+1, '/')+1;
4919 mdstat = mdstat_by_subdev(array, container);
4922 if (mdstat->active == 0) {
4923 pr_err("Skipping inactive array %s.\n",
4925 free_mdstat(mdstat);
4932 pr_err("Unable to determine reshaped array for %s\n", devname);
4934 goto Grow_continue_command_exit;
4936 fd2 = open_dev(mdstat->devnm);
4938 pr_err("cannot open (%s)\n", mdstat->devnm);
4940 goto Grow_continue_command_exit;
4943 sysfs_init(content, fd2, mdstat->devnm);
4947 /* start mdmon in case it is not running
4949 if (!mdmon_running(container))
4950 start_mdmon(container);
4951 ping_monitor(container);
4953 if (mdmon_running(container))
4954 st->update_tail = &st->updates;
4956 pr_err("No mdmon found. Grow cannot continue.\n");
4958 goto Grow_continue_command_exit;
4962 /* verify that array under reshape is started from
4965 if (verify_reshape_position(content, content->array.level) < 0) {
4967 goto Grow_continue_command_exit;
4972 ret_val = Grow_continue(fd, st, content, backup_file, 1, 0);
4974 Grow_continue_command_exit:
4977 st->ss->free_super(st);
4978 free_mdstat(mdstat);
4985 int Grow_continue(int mdfd, struct supertype *st, struct mdinfo *info,
4986 char *backup_file, int forked, int freeze_reshape)
4990 if (!info->reshape_active)
4993 if (st->ss->external) {
4994 int cfd = open_dev(st->container_devnm);
4999 st->ss->load_container(st, cfd, st->container_devnm);
5001 ret_val = reshape_container(st->container_devnm, NULL, mdfd,
5002 st, info, 0, backup_file,
5004 1 | info->reshape_active,
5007 ret_val = reshape_array(NULL, mdfd, "array", st, info, 1,
5008 NULL, INVALID_SECTORS,
5009 backup_file, 0, forked,
5010 1 | info->reshape_active,
5016 char *make_backup(char *name)
5018 char *base = "backup_file-";
5022 len = strlen(MAP_DIR) + 1 + strlen(base) + strlen(name)+1;
5023 fname = xmalloc(len);
5024 sprintf(fname, "%s/%s%s", MAP_DIR, base, name);
5028 char *locate_backup(char *name)
5030 char *fl = make_backup(name);
5033 if (stat(fl, &stb) == 0 &&
5034 S_ISREG(stb.st_mode))