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[thirdparty/mdadm.git] / Grow.c
1 /*
2 * mdadm - manage Linux "md" devices aka RAID arrays.
3 *
4 * Copyright (C) 2001-2013 Neil Brown <neilb@suse.de>
5 *
6 *
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.
11 *
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.
16 *
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
20 *
21 * Author: Neil Brown
22 * Email: <neilb@suse.de>
23 */
24 #include "mdadm.h"
25 #include "dlink.h"
26 #include <sys/mman.h>
27 #include <stddef.h>
28 #include <stdint.h>
29 #include <signal.h>
30 #include <sys/wait.h>
31
32 #if ! defined(__BIG_ENDIAN) && ! defined(__LITTLE_ENDIAN)
33 #error no endian defined
34 #endif
35 #include "md_u.h"
36 #include "md_p.h"
37
38 int restore_backup(struct supertype *st,
39 struct mdinfo *content,
40 int working_disks,
41 int next_spare,
42 char **backup_filep,
43 int verbose)
44 {
45 int i;
46 int *fdlist;
47 struct mdinfo *dev;
48 int err;
49 int disk_count = next_spare + working_disks;
50 char *backup_file = *backup_filep;
51
52 dprintf("Called restore_backup()\n");
53 fdlist = xmalloc(sizeof(int) * disk_count);
54
55 enable_fds(next_spare);
56 for (i = 0; i < next_spare; i++)
57 fdlist[i] = -1;
58 for (dev = content->devs; dev; dev = dev->next) {
59 char buf[22];
60 int fd;
61
62 sprintf(buf, "%d:%d", dev->disk.major, dev->disk.minor);
63 fd = dev_open(buf, O_RDWR);
64
65 if (dev->disk.raid_disk >= 0)
66 fdlist[dev->disk.raid_disk] = fd;
67 else
68 fdlist[next_spare++] = fd;
69 }
70
71 if (!backup_file) {
72 backup_file = locate_backup(content->sys_name);
73 *backup_filep = backup_file;
74 }
75
76 if (st->ss->external && st->ss->recover_backup)
77 err = st->ss->recover_backup(st, content);
78 else
79 err = Grow_restart(st, content, fdlist, next_spare,
80 backup_file, verbose > 0);
81
82 while (next_spare > 0) {
83 next_spare--;
84 if (fdlist[next_spare] >= 0)
85 close(fdlist[next_spare]);
86 }
87 free(fdlist);
88 if (err) {
89 pr_err("Failed to restore critical section for reshape - sorry.\n");
90 if (!backup_file)
91 pr_err("Possibly you need to specify a --backup-file\n");
92 return 1;
93 }
94
95 dprintf("restore_backup() returns status OK.\n");
96 return 0;
97 }
98
99 int Grow_Add_device(char *devname, int fd, char *newdev)
100 {
101 /* Add a device to an active array.
102 * Currently, just extend a linear array.
103 * This requires writing a new superblock on the
104 * new device, calling the kernel to add the device,
105 * and if that succeeds, update the superblock on
106 * all other devices.
107 * This means that we need to *find* all other devices.
108 */
109 struct mdinfo info;
110
111 dev_t rdev;
112 int nfd, fd2;
113 int d, nd;
114 struct supertype *st = NULL;
115 char *subarray = NULL;
116
117 if (md_get_array_info(fd, &info.array) < 0) {
118 pr_err("cannot get array info for %s\n", devname);
119 return 1;
120 }
121
122 if (info.array.level != -1) {
123 pr_err("can only add devices to linear arrays\n");
124 return 1;
125 }
126
127 st = super_by_fd(fd, &subarray);
128 if (!st) {
129 pr_err("cannot handle arrays with superblock version %d\n",
130 info.array.major_version);
131 return 1;
132 }
133
134 if (subarray) {
135 pr_err("Cannot grow linear sub-arrays yet\n");
136 free(subarray);
137 free(st);
138 return 1;
139 }
140
141 nfd = open(newdev, O_RDWR|O_EXCL|O_DIRECT);
142 if (nfd < 0) {
143 pr_err("cannot open %s\n", newdev);
144 free(st);
145 return 1;
146 }
147 if (!fstat_is_blkdev(nfd, newdev, &rdev)) {
148 close(nfd);
149 free(st);
150 return 1;
151 }
152 /* now check out all the devices and make sure we can read the
153 * superblock */
154 for (d=0 ; d < info.array.raid_disks ; d++) {
155 mdu_disk_info_t disk;
156 char *dv;
157
158 st->ss->free_super(st);
159
160 disk.number = d;
161 if (md_get_disk_info(fd, &disk) < 0) {
162 pr_err("cannot get device detail for device %d\n", d);
163 close(nfd);
164 free(st);
165 return 1;
166 }
167 dv = map_dev(disk.major, disk.minor, 1);
168 if (!dv) {
169 pr_err("cannot find device file for device %d\n", d);
170 close(nfd);
171 free(st);
172 return 1;
173 }
174 fd2 = dev_open(dv, O_RDWR);
175 if (fd2 < 0) {
176 pr_err("cannot open device file %s\n", dv);
177 close(nfd);
178 free(st);
179 return 1;
180 }
181
182 if (st->ss->load_super(st, fd2, NULL)) {
183 pr_err("cannot find super block on %s\n", dv);
184 close(nfd);
185 close(fd2);
186 free(st);
187 return 1;
188 }
189 close(fd2);
190 }
191 /* Ok, looks good. Lets update the superblock and write it out to
192 * newdev.
193 */
194
195 info.disk.number = d;
196 info.disk.major = major(rdev);
197 info.disk.minor = minor(rdev);
198 info.disk.raid_disk = d;
199 info.disk.state = (1 << MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE);
200 st->ss->update_super(st, &info, "linear-grow-new", newdev, 0, 0, NULL);
201
202 if (st->ss->store_super(st, nfd)) {
203 pr_err("Cannot store new superblock on %s\n", newdev);
204 close(nfd);
205 return 1;
206 }
207 close(nfd);
208
209 if (ioctl(fd, ADD_NEW_DISK, &info.disk) != 0) {
210 pr_err("Cannot add new disk to this array\n");
211 return 1;
212 }
213 /* Well, that seems to have worked.
214 * Now go through and update all superblocks
215 */
216
217 if (md_get_array_info(fd, &info.array) < 0) {
218 pr_err("cannot get array info for %s\n", devname);
219 return 1;
220 }
221
222 nd = d;
223 for (d=0 ; d < info.array.raid_disks ; d++) {
224 mdu_disk_info_t disk;
225 char *dv;
226
227 disk.number = d;
228 if (md_get_disk_info(fd, &disk) < 0) {
229 pr_err("cannot get device detail for device %d\n", d);
230 return 1;
231 }
232 dv = map_dev(disk.major, disk.minor, 1);
233 if (!dv) {
234 pr_err("cannot find device file for device %d\n", d);
235 return 1;
236 }
237 fd2 = dev_open(dv, O_RDWR);
238 if (fd2 < 0) {
239 pr_err("cannot open device file %s\n", dv);
240 return 1;
241 }
242 if (st->ss->load_super(st, fd2, NULL)) {
243 pr_err("cannot find super block on %s\n", dv);
244 close(fd);
245 close(fd2);
246 return 1;
247 }
248 info.array.raid_disks = nd+1;
249 info.array.nr_disks = nd+1;
250 info.array.active_disks = nd+1;
251 info.array.working_disks = nd+1;
252
253 st->ss->update_super(st, &info, "linear-grow-update", dv,
254 0, 0, NULL);
255
256 if (st->ss->store_super(st, fd2)) {
257 pr_err("Cannot store new superblock on %s\n", dv);
258 close(fd2);
259 return 1;
260 }
261 close(fd2);
262 }
263
264 return 0;
265 }
266
267 int Grow_addbitmap(char *devname, int fd, struct context *c, struct shape *s)
268 {
269 /*
270 * First check that array doesn't have a bitmap
271 * Then create the bitmap
272 * Then add it
273 *
274 * For internal bitmaps, we need to check the version,
275 * find all the active devices, and write the bitmap block
276 * to all devices
277 */
278 mdu_bitmap_file_t bmf;
279 mdu_array_info_t array;
280 struct supertype *st;
281 char *subarray = NULL;
282 int major = BITMAP_MAJOR_HI;
283 unsigned long long bitmapsize, array_size;
284 struct mdinfo *mdi;
285
286 /*
287 * We only ever get called if s->bitmap_file is != NULL, so this check
288 * is just here to quiet down static code checkers.
289 */
290 if (!s->bitmap_file)
291 return 1;
292
293 if (strcmp(s->bitmap_file, "clustered") == 0)
294 major = BITMAP_MAJOR_CLUSTERED;
295
296 if (ioctl(fd, GET_BITMAP_FILE, &bmf) != 0) {
297 if (errno == ENOMEM)
298 pr_err("Memory allocation failure.\n");
299 else
300 pr_err("bitmaps not supported by this kernel.\n");
301 return 1;
302 }
303 if (bmf.pathname[0]) {
304 if (strcmp(s->bitmap_file,"none") == 0) {
305 if (ioctl(fd, SET_BITMAP_FILE, -1) != 0) {
306 pr_err("failed to remove bitmap %s\n",
307 bmf.pathname);
308 return 1;
309 }
310 return 0;
311 }
312 pr_err("%s already has a bitmap (%s)\n", devname, bmf.pathname);
313 return 1;
314 }
315 if (md_get_array_info(fd, &array) != 0) {
316 pr_err("cannot get array status for %s\n", devname);
317 return 1;
318 }
319 if (array.state & (1 << MD_SB_BITMAP_PRESENT)) {
320 if (strcmp(s->bitmap_file, "none")==0) {
321 array.state &= ~(1 << MD_SB_BITMAP_PRESENT);
322 if (md_set_array_info(fd, &array) != 0) {
323 if (array.state & (1 << MD_SB_CLUSTERED))
324 pr_err("failed to remove clustered bitmap.\n");
325 else
326 pr_err("failed to remove internal bitmap.\n");
327 return 1;
328 }
329 return 0;
330 }
331 pr_err("bitmap already present on %s\n", devname);
332 return 1;
333 }
334
335 if (strcmp(s->bitmap_file, "none") == 0) {
336 pr_err("no bitmap found on %s\n", devname);
337 return 1;
338 }
339 if (array.level <= 0) {
340 pr_err("Bitmaps not meaningful with level %s\n",
341 map_num(pers, array.level)?:"of this array");
342 return 1;
343 }
344 bitmapsize = array.size;
345 bitmapsize <<= 1;
346 if (get_dev_size(fd, NULL, &array_size) &&
347 array_size > (0x7fffffffULL << 9)) {
348 /* Array is big enough that we cannot trust array.size
349 * try other approaches
350 */
351 bitmapsize = get_component_size(fd);
352 }
353 if (bitmapsize == 0) {
354 pr_err("Cannot reliably determine size of array to create bitmap - sorry.\n");
355 return 1;
356 }
357
358 if (array.level == 10) {
359 int ncopies;
360
361 ncopies = (array.layout & 255) * ((array.layout >> 8) & 255);
362 bitmapsize = bitmapsize * array.raid_disks / ncopies;
363
364 if (strcmp(s->bitmap_file, "clustered") == 0 &&
365 !is_near_layout_10(array.layout)) {
366 pr_err("only near layout is supported with clustered raid10\n");
367 return 1;
368 }
369 }
370
371 st = super_by_fd(fd, &subarray);
372 if (!st) {
373 pr_err("Cannot understand version %d.%d\n",
374 array.major_version, array.minor_version);
375 return 1;
376 }
377 if (subarray) {
378 pr_err("Cannot add bitmaps to sub-arrays yet\n");
379 free(subarray);
380 free(st);
381 return 1;
382 }
383
384 mdi = sysfs_read(fd, NULL, GET_CONSISTENCY_POLICY);
385 if (mdi) {
386 if (mdi->consistency_policy == CONSISTENCY_POLICY_PPL) {
387 pr_err("Cannot add bitmap to array with PPL\n");
388 free(mdi);
389 free(st);
390 return 1;
391 }
392 free(mdi);
393 }
394
395 if (strcmp(s->bitmap_file, "internal") == 0 ||
396 strcmp(s->bitmap_file, "clustered") == 0) {
397 int rv;
398 int d;
399 int offset_setable = 0;
400 if (st->ss->add_internal_bitmap == NULL) {
401 pr_err("Internal bitmaps not supported with %s metadata\n", st->ss->name);
402 return 1;
403 }
404 st->nodes = c->nodes;
405 st->cluster_name = c->homecluster;
406 mdi = sysfs_read(fd, NULL, GET_BITMAP_LOCATION);
407 if (mdi)
408 offset_setable = 1;
409 for (d = 0; d < st->max_devs; d++) {
410 mdu_disk_info_t disk;
411 char *dv;
412 int fd2;
413
414 disk.number = d;
415 if (md_get_disk_info(fd, &disk) < 0)
416 continue;
417 if (disk.major == 0 && disk.minor == 0)
418 continue;
419 if ((disk.state & (1 << MD_DISK_SYNC)) == 0)
420 continue;
421 dv = map_dev(disk.major, disk.minor, 1);
422 if (!dv)
423 continue;
424 fd2 = dev_open(dv, O_RDWR);
425 if (fd2 < 0)
426 continue;
427 rv = st->ss->load_super(st, fd2, NULL);
428 if (!rv) {
429 rv = st->ss->add_internal_bitmap(
430 st, &s->bitmap_chunk, c->delay,
431 s->write_behind, bitmapsize,
432 offset_setable, major);
433 if (!rv) {
434 st->ss->write_bitmap(st, fd2,
435 NodeNumUpdate);
436 } else {
437 pr_err("failed to create internal bitmap - chunksize problem.\n");
438 }
439 } else {
440 pr_err("failed to load super-block.\n");
441 }
442 close(fd2);
443 if (rv)
444 return 1;
445 }
446 if (offset_setable) {
447 st->ss->getinfo_super(st, mdi, NULL);
448 if (sysfs_init(mdi, fd, NULL)) {
449 pr_err("failed to intialize sysfs.\n");
450 free(mdi);
451 }
452 rv = sysfs_set_num_signed(mdi, NULL, "bitmap/location",
453 mdi->bitmap_offset);
454 free(mdi);
455 } else {
456 if (strcmp(s->bitmap_file, "clustered") == 0)
457 array.state |= (1 << MD_SB_CLUSTERED);
458 array.state |= (1 << MD_SB_BITMAP_PRESENT);
459 rv = md_set_array_info(fd, &array);
460 }
461 if (rv < 0) {
462 if (errno == EBUSY)
463 pr_err("Cannot add bitmap while array is resyncing or reshaping etc.\n");
464 pr_err("failed to set internal bitmap.\n");
465 return 1;
466 }
467 } else {
468 int uuid[4];
469 int bitmap_fd;
470 int d;
471 int max_devs = st->max_devs;
472
473 /* try to load a superblock */
474 for (d = 0; d < max_devs; d++) {
475 mdu_disk_info_t disk;
476 char *dv;
477 int fd2;
478 disk.number = d;
479 if (md_get_disk_info(fd, &disk) < 0)
480 continue;
481 if ((disk.major==0 && disk.minor == 0) ||
482 (disk.state & (1 << MD_DISK_REMOVED)))
483 continue;
484 dv = map_dev(disk.major, disk.minor, 1);
485 if (!dv)
486 continue;
487 fd2 = dev_open(dv, O_RDONLY);
488 if (fd2 >= 0) {
489 if (st->ss->load_super(st, fd2, NULL) == 0) {
490 close(fd2);
491 st->ss->uuid_from_super(st, uuid);
492 break;
493 }
494 close(fd2);
495 }
496 }
497 if (d == max_devs) {
498 pr_err("cannot find UUID for array!\n");
499 return 1;
500 }
501 if (CreateBitmap(s->bitmap_file, c->force, (char*)uuid,
502 s->bitmap_chunk, c->delay, s->write_behind,
503 bitmapsize, major)) {
504 return 1;
505 }
506 bitmap_fd = open(s->bitmap_file, O_RDWR);
507 if (bitmap_fd < 0) {
508 pr_err("weird: %s cannot be opened\n", s->bitmap_file);
509 return 1;
510 }
511 if (ioctl(fd, SET_BITMAP_FILE, bitmap_fd) < 0) {
512 int err = errno;
513 if (errno == EBUSY)
514 pr_err("Cannot add bitmap while array is resyncing or reshaping etc.\n");
515 pr_err("Cannot set bitmap file for %s: %s\n",
516 devname, strerror(err));
517 return 1;
518 }
519 }
520
521 return 0;
522 }
523
524 int Grow_consistency_policy(char *devname, int fd, struct context *c, struct shape *s)
525 {
526 struct supertype *st;
527 struct mdinfo *sra;
528 struct mdinfo *sd;
529 char *subarray = NULL;
530 int ret = 0;
531 char container_dev[PATH_MAX];
532 char buf[20];
533
534 if (s->consistency_policy != CONSISTENCY_POLICY_RESYNC &&
535 s->consistency_policy != CONSISTENCY_POLICY_PPL) {
536 pr_err("Operation not supported for consistency policy %s\n",
537 map_num(consistency_policies, s->consistency_policy));
538 return 1;
539 }
540
541 st = super_by_fd(fd, &subarray);
542 if (!st)
543 return 1;
544
545 sra = sysfs_read(fd, NULL, GET_CONSISTENCY_POLICY|GET_LEVEL|
546 GET_DEVS|GET_STATE);
547 if (!sra) {
548 ret = 1;
549 goto free_st;
550 }
551
552 if (s->consistency_policy == CONSISTENCY_POLICY_PPL &&
553 !st->ss->write_init_ppl) {
554 pr_err("%s metadata does not support PPL\n", st->ss->name);
555 ret = 1;
556 goto free_info;
557 }
558
559 if (sra->array.level != 5) {
560 pr_err("Operation not supported for array level %d\n",
561 sra->array.level);
562 ret = 1;
563 goto free_info;
564 }
565
566 if (sra->consistency_policy == (unsigned)s->consistency_policy) {
567 pr_err("Consistency policy is already %s\n",
568 map_num(consistency_policies, s->consistency_policy));
569 ret = 1;
570 goto free_info;
571 } else if (sra->consistency_policy != CONSISTENCY_POLICY_RESYNC &&
572 sra->consistency_policy != CONSISTENCY_POLICY_PPL) {
573 pr_err("Current consistency policy is %s, cannot change to %s\n",
574 map_num(consistency_policies, sra->consistency_policy),
575 map_num(consistency_policies, s->consistency_policy));
576 ret = 1;
577 goto free_info;
578 }
579
580 if (s->consistency_policy == CONSISTENCY_POLICY_PPL) {
581 if (sysfs_get_str(sra, NULL, "sync_action", buf, 20) <= 0) {
582 ret = 1;
583 goto free_info;
584 } else if (strcmp(buf, "reshape\n") == 0) {
585 pr_err("PPL cannot be enabled when reshape is in progress\n");
586 ret = 1;
587 goto free_info;
588 }
589 }
590
591 if (subarray) {
592 char *update;
593
594 if (s->consistency_policy == CONSISTENCY_POLICY_PPL)
595 update = "ppl";
596 else
597 update = "no-ppl";
598
599 sprintf(container_dev, "/dev/%s", st->container_devnm);
600
601 ret = Update_subarray(container_dev, subarray, update, NULL,
602 c->verbose);
603 if (ret)
604 goto free_info;
605 }
606
607 if (s->consistency_policy == CONSISTENCY_POLICY_PPL) {
608 struct mdinfo info;
609
610 if (subarray) {
611 struct mdinfo *mdi;
612 int cfd;
613
614 cfd = open(container_dev, O_RDWR|O_EXCL);
615 if (cfd < 0) {
616 pr_err("Failed to open %s\n", container_dev);
617 ret = 1;
618 goto free_info;
619 }
620
621 ret = st->ss->load_container(st, cfd, st->container_devnm);
622 close(cfd);
623
624 if (ret) {
625 pr_err("Cannot read superblock for %s\n",
626 container_dev);
627 goto free_info;
628 }
629
630 mdi = st->ss->container_content(st, subarray);
631 info = *mdi;
632 free(mdi);
633 }
634
635 for (sd = sra->devs; sd; sd = sd->next) {
636 int dfd;
637 char *devpath;
638
639 devpath = map_dev(sd->disk.major, sd->disk.minor, 0);
640 dfd = dev_open(devpath, O_RDWR);
641 if (dfd < 0) {
642 pr_err("Failed to open %s\n", devpath);
643 ret = 1;
644 goto free_info;
645 }
646
647 if (!subarray) {
648 ret = st->ss->load_super(st, dfd, NULL);
649 if (ret) {
650 pr_err("Failed to load super-block.\n");
651 close(dfd);
652 goto free_info;
653 }
654
655 ret = st->ss->update_super(st, sra, "ppl",
656 devname,
657 c->verbose, 0, NULL);
658 if (ret) {
659 close(dfd);
660 st->ss->free_super(st);
661 goto free_info;
662 }
663 st->ss->getinfo_super(st, &info, NULL);
664 }
665
666 ret |= sysfs_set_num(sra, sd, "ppl_sector",
667 info.ppl_sector);
668 ret |= sysfs_set_num(sra, sd, "ppl_size",
669 info.ppl_size);
670
671 if (ret) {
672 pr_err("Failed to set PPL attributes for %s\n",
673 sd->sys_name);
674 close(dfd);
675 st->ss->free_super(st);
676 goto free_info;
677 }
678
679 ret = st->ss->write_init_ppl(st, &info, dfd);
680 if (ret)
681 pr_err("Failed to write PPL\n");
682
683 close(dfd);
684
685 if (!subarray)
686 st->ss->free_super(st);
687
688 if (ret)
689 goto free_info;
690 }
691 }
692
693 ret = sysfs_set_str(sra, NULL, "consistency_policy",
694 map_num(consistency_policies,
695 s->consistency_policy));
696 if (ret)
697 pr_err("Failed to change array consistency policy\n");
698
699 free_info:
700 sysfs_free(sra);
701 free_st:
702 free(st);
703 free(subarray);
704
705 return ret;
706 }
707
708 /*
709 * When reshaping an array we might need to backup some data.
710 * This is written to all spares with a 'super_block' describing it.
711 * The superblock goes 4K from the end of the used space on the
712 * device.
713 * It if written after the backup is complete.
714 * It has the following structure.
715 */
716
717 static struct mdp_backup_super {
718 char magic[16]; /* md_backup_data-1 or -2 */
719 __u8 set_uuid[16];
720 __u64 mtime;
721 /* start/sizes in 512byte sectors */
722 __u64 devstart; /* address on backup device/file of data */
723 __u64 arraystart;
724 __u64 length;
725 __u32 sb_csum; /* csum of preceeding bytes. */
726 __u32 pad1;
727 __u64 devstart2; /* offset in to data of second section */
728 __u64 arraystart2;
729 __u64 length2;
730 __u32 sb_csum2; /* csum of preceeding bytes. */
731 __u8 pad[512-68-32];
732 } __attribute__((aligned(512))) bsb, bsb2;
733
734 static __u32 bsb_csum(char *buf, int len)
735 {
736 int i;
737 int csum = 0;
738 for (i = 0; i < len; i++)
739 csum = (csum<<3) + buf[0];
740 return __cpu_to_le32(csum);
741 }
742
743 static int check_idle(struct supertype *st)
744 {
745 /* Check that all member arrays for this container, or the
746 * container of this array, are idle
747 */
748 char *container = (st->container_devnm[0]
749 ? st->container_devnm : st->devnm);
750 struct mdstat_ent *ent, *e;
751 int is_idle = 1;
752
753 ent = mdstat_read(0, 0);
754 for (e = ent ; e; e = e->next) {
755 if (!is_container_member(e, container))
756 continue;
757 /* frozen array is not idle*/
758 if (e->percent >= 0 || e->metadata_version[9] == '-') {
759 is_idle = 0;
760 break;
761 }
762 }
763 free_mdstat(ent);
764 return is_idle;
765 }
766
767 static int freeze_container(struct supertype *st)
768 {
769 char *container = (st->container_devnm[0]
770 ? st->container_devnm : st->devnm);
771
772 if (!check_idle(st))
773 return -1;
774
775 if (block_monitor(container, 1)) {
776 pr_err("failed to freeze container\n");
777 return -2;
778 }
779
780 return 1;
781 }
782
783 static void unfreeze_container(struct supertype *st)
784 {
785 char *container = (st->container_devnm[0]
786 ? st->container_devnm : st->devnm);
787
788 unblock_monitor(container, 1);
789 }
790
791 static int freeze(struct supertype *st)
792 {
793 /* Try to freeze resync/rebuild on this array/container.
794 * Return -1 if the array is busy,
795 * return -2 container cannot be frozen,
796 * return 0 if this kernel doesn't support 'frozen'
797 * return 1 if it worked.
798 */
799 if (st->ss->external)
800 return freeze_container(st);
801 else {
802 struct mdinfo *sra = sysfs_read(-1, st->devnm, GET_VERSION);
803 int err;
804 char buf[20];
805
806 if (!sra)
807 return -1;
808 /* Need to clear any 'read-auto' status */
809 if (sysfs_get_str(sra, NULL, "array_state", buf, 20) > 0 &&
810 strncmp(buf, "read-auto", 9) == 0)
811 sysfs_set_str(sra, NULL, "array_state", "clean");
812
813 err = sysfs_freeze_array(sra);
814 sysfs_free(sra);
815 return err;
816 }
817 }
818
819 static void unfreeze(struct supertype *st)
820 {
821 if (st->ss->external)
822 return unfreeze_container(st);
823 else {
824 struct mdinfo *sra = sysfs_read(-1, st->devnm, GET_VERSION);
825 char buf[20];
826
827 if (sra &&
828 sysfs_get_str(sra, NULL, "sync_action", buf, 20) > 0 &&
829 strcmp(buf, "frozen\n") == 0)
830 sysfs_set_str(sra, NULL, "sync_action", "idle");
831 sysfs_free(sra);
832 }
833 }
834
835 static void wait_reshape(struct mdinfo *sra)
836 {
837 int fd = sysfs_get_fd(sra, NULL, "sync_action");
838 char action[20];
839
840 if (fd < 0)
841 return;
842
843 while (sysfs_fd_get_str(fd, action, 20) > 0 &&
844 strncmp(action, "reshape", 7) == 0)
845 sysfs_wait(fd, NULL);
846 close(fd);
847 }
848
849 static int reshape_super(struct supertype *st, unsigned long long size,
850 int level, int layout, int chunksize, int raid_disks,
851 int delta_disks, char *backup_file, char *dev,
852 int direction, int verbose)
853 {
854 /* nothing extra to check in the native case */
855 if (!st->ss->external)
856 return 0;
857 if (!st->ss->reshape_super || !st->ss->manage_reshape) {
858 pr_err("%s metadata does not support reshape\n",
859 st->ss->name);
860 return 1;
861 }
862
863 return st->ss->reshape_super(st, size, level, layout, chunksize,
864 raid_disks, delta_disks, backup_file, dev,
865 direction, verbose);
866 }
867
868 static void sync_metadata(struct supertype *st)
869 {
870 if (st->ss->external) {
871 if (st->update_tail) {
872 flush_metadata_updates(st);
873 st->update_tail = &st->updates;
874 } else
875 st->ss->sync_metadata(st);
876 }
877 }
878
879 static int subarray_set_num(char *container, struct mdinfo *sra, char *name, int n)
880 {
881 /* when dealing with external metadata subarrays we need to be
882 * prepared to handle EAGAIN. The kernel may need to wait for
883 * mdmon to mark the array active so the kernel can handle
884 * allocations/writeback when preparing the reshape action
885 * (md_allow_write()). We temporarily disable safe_mode_delay
886 * to close a race with the array_state going clean before the
887 * next write to raid_disks / stripe_cache_size
888 */
889 char safe[50];
890 int rc;
891
892 /* only 'raid_disks' and 'stripe_cache_size' trigger md_allow_write */
893 if (!container ||
894 (strcmp(name, "raid_disks") != 0 &&
895 strcmp(name, "stripe_cache_size") != 0))
896 return sysfs_set_num(sra, NULL, name, n);
897
898 rc = sysfs_get_str(sra, NULL, "safe_mode_delay", safe, sizeof(safe));
899 if (rc <= 0)
900 return -1;
901 sysfs_set_num(sra, NULL, "safe_mode_delay", 0);
902 rc = sysfs_set_num(sra, NULL, name, n);
903 if (rc < 0 && errno == EAGAIN) {
904 ping_monitor(container);
905 /* if we get EAGAIN here then the monitor is not active
906 * so stop trying
907 */
908 rc = sysfs_set_num(sra, NULL, name, n);
909 }
910 sysfs_set_str(sra, NULL, "safe_mode_delay", safe);
911 return rc;
912 }
913
914 int start_reshape(struct mdinfo *sra, int already_running,
915 int before_data_disks, int data_disks)
916 {
917 int err;
918 unsigned long long sync_max_to_set;
919
920 sysfs_set_num(sra, NULL, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL);
921 err = sysfs_set_num(sra, NULL, "suspend_hi", sra->reshape_progress);
922 err = err ?: sysfs_set_num(sra, NULL, "suspend_lo",
923 sra->reshape_progress);
924 if (before_data_disks <= data_disks)
925 sync_max_to_set = sra->reshape_progress / data_disks;
926 else
927 sync_max_to_set = (sra->component_size * data_disks
928 - sra->reshape_progress) / data_disks;
929 if (!already_running)
930 sysfs_set_num(sra, NULL, "sync_min", sync_max_to_set);
931 err = err ?: sysfs_set_num(sra, NULL, "sync_max", sync_max_to_set);
932 if (!already_running && err == 0) {
933 int cnt = 5;
934 do {
935 err = sysfs_set_str(sra, NULL, "sync_action",
936 "reshape");
937 if (err)
938 sleep(1);
939 } while (err && errno == EBUSY && cnt-- > 0);
940 }
941 return err;
942 }
943
944 void abort_reshape(struct mdinfo *sra)
945 {
946 sysfs_set_str(sra, NULL, "sync_action", "idle");
947 /*
948 * Prior to kernel commit: 23ddff3792f6 ("md: allow suspend_lo and
949 * suspend_hi to decrease as well as increase.")
950 * you could only increase suspend_{lo,hi} unless the region they
951 * covered was empty. So to reset to 0, you need to push suspend_lo
952 * up past suspend_hi first. So to maximize the chance of mdadm
953 * working on all kernels, we want to keep doing that.
954 */
955 sysfs_set_num(sra, NULL, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL);
956 sysfs_set_num(sra, NULL, "suspend_hi", 0);
957 sysfs_set_num(sra, NULL, "suspend_lo", 0);
958 sysfs_set_num(sra, NULL, "sync_min", 0);
959 // It isn't safe to reset sync_max as we aren't monitoring.
960 // Array really should be stopped at this point.
961 }
962
963 int remove_disks_for_takeover(struct supertype *st,
964 struct mdinfo *sra,
965 int layout)
966 {
967 int nr_of_copies;
968 struct mdinfo *remaining;
969 int slot;
970
971 if (st->ss->external) {
972 int rv = 0;
973 struct mdinfo *arrays = st->ss->container_content(st, NULL);
974 /*
975 * containter_content returns list of arrays in container
976 * If arrays->next is not NULL it means that there are
977 * 2 arrays in container and operation should be blocked
978 */
979 if (arrays) {
980 if (arrays->next)
981 rv = 1;
982 sysfs_free(arrays);
983 if (rv) {
984 pr_err("Error. Cannot perform operation on /dev/%s\n", st->devnm);
985 pr_err("For this operation it MUST be single array in container\n");
986 return rv;
987 }
988 }
989 }
990
991 if (sra->array.level == 10)
992 nr_of_copies = layout & 0xff;
993 else if (sra->array.level == 1)
994 nr_of_copies = sra->array.raid_disks;
995 else
996 return 1;
997
998 remaining = sra->devs;
999 sra->devs = NULL;
1000 /* for each 'copy', select one device and remove from the list. */
1001 for (slot = 0; slot < sra->array.raid_disks; slot += nr_of_copies) {
1002 struct mdinfo **diskp;
1003 int found = 0;
1004
1005 /* Find a working device to keep */
1006 for (diskp = &remaining; *diskp ; diskp = &(*diskp)->next) {
1007 struct mdinfo *disk = *diskp;
1008
1009 if (disk->disk.raid_disk < slot)
1010 continue;
1011 if (disk->disk.raid_disk >= slot + nr_of_copies)
1012 continue;
1013 if (disk->disk.state & (1<<MD_DISK_REMOVED))
1014 continue;
1015 if (disk->disk.state & (1<<MD_DISK_FAULTY))
1016 continue;
1017 if (!(disk->disk.state & (1<<MD_DISK_SYNC)))
1018 continue;
1019
1020 /* We have found a good disk to use! */
1021 *diskp = disk->next;
1022 disk->next = sra->devs;
1023 sra->devs = disk;
1024 found = 1;
1025 break;
1026 }
1027 if (!found)
1028 break;
1029 }
1030
1031 if (slot < sra->array.raid_disks) {
1032 /* didn't find all slots */
1033 struct mdinfo **e;
1034 e = &remaining;
1035 while (*e)
1036 e = &(*e)->next;
1037 *e = sra->devs;
1038 sra->devs = remaining;
1039 return 1;
1040 }
1041
1042 /* Remove all 'remaining' devices from the array */
1043 while (remaining) {
1044 struct mdinfo *sd = remaining;
1045 remaining = sd->next;
1046
1047 sysfs_set_str(sra, sd, "state", "faulty");
1048 sysfs_set_str(sra, sd, "slot", "none");
1049 /* for external metadata disks should be removed in mdmon */
1050 if (!st->ss->external)
1051 sysfs_set_str(sra, sd, "state", "remove");
1052 sd->disk.state |= (1<<MD_DISK_REMOVED);
1053 sd->disk.state &= ~(1<<MD_DISK_SYNC);
1054 sd->next = sra->devs;
1055 sra->devs = sd;
1056 }
1057 return 0;
1058 }
1059
1060 void reshape_free_fdlist(int *fdlist,
1061 unsigned long long *offsets,
1062 int size)
1063 {
1064 int i;
1065
1066 for (i = 0; i < size; i++)
1067 if (fdlist[i] >= 0)
1068 close(fdlist[i]);
1069
1070 free(fdlist);
1071 free(offsets);
1072 }
1073
1074 int reshape_prepare_fdlist(char *devname,
1075 struct mdinfo *sra,
1076 int raid_disks,
1077 int nrdisks,
1078 unsigned long blocks,
1079 char *backup_file,
1080 int *fdlist,
1081 unsigned long long *offsets)
1082 {
1083 int d = 0;
1084 struct mdinfo *sd;
1085
1086 enable_fds(nrdisks);
1087 for (d = 0; d <= nrdisks; d++)
1088 fdlist[d] = -1;
1089 d = raid_disks;
1090 for (sd = sra->devs; sd; sd = sd->next) {
1091 if (sd->disk.state & (1<<MD_DISK_FAULTY))
1092 continue;
1093 if (sd->disk.state & (1<<MD_DISK_SYNC) &&
1094 sd->disk.raid_disk < raid_disks) {
1095 char *dn = map_dev(sd->disk.major, sd->disk.minor, 1);
1096 fdlist[sd->disk.raid_disk] = dev_open(dn, O_RDONLY);
1097 offsets[sd->disk.raid_disk] = sd->data_offset*512;
1098 if (fdlist[sd->disk.raid_disk] < 0) {
1099 pr_err("%s: cannot open component %s\n",
1100 devname, dn ? dn : "-unknown-");
1101 d = -1;
1102 goto release;
1103 }
1104 } else if (backup_file == NULL) {
1105 /* spare */
1106 char *dn = map_dev(sd->disk.major, sd->disk.minor, 1);
1107 fdlist[d] = dev_open(dn, O_RDWR);
1108 offsets[d] = (sd->data_offset + sra->component_size - blocks - 8)*512;
1109 if (fdlist[d] < 0) {
1110 pr_err("%s: cannot open component %s\n",
1111 devname, dn ? dn : "-unknown-");
1112 d = -1;
1113 goto release;
1114 }
1115 d++;
1116 }
1117 }
1118 release:
1119 return d;
1120 }
1121
1122 int reshape_open_backup_file(char *backup_file,
1123 int fd,
1124 char *devname,
1125 long blocks,
1126 int *fdlist,
1127 unsigned long long *offsets,
1128 char *sys_name,
1129 int restart)
1130 {
1131 /* Return 1 on success, 0 on any form of failure */
1132 /* need to check backup file is large enough */
1133 char buf[512];
1134 struct stat stb;
1135 unsigned int dev;
1136 int i;
1137
1138 *fdlist = open(backup_file, O_RDWR|O_CREAT|(restart ? O_TRUNC : O_EXCL),
1139 S_IRUSR | S_IWUSR);
1140 *offsets = 8 * 512;
1141 if (*fdlist < 0) {
1142 pr_err("%s: cannot create backup file %s: %s\n",
1143 devname, backup_file, strerror(errno));
1144 return 0;
1145 }
1146 /* Guard against backup file being on array device.
1147 * If array is partitioned or if LVM etc is in the
1148 * way this will not notice, but it is better than
1149 * nothing.
1150 */
1151 fstat(*fdlist, &stb);
1152 dev = stb.st_dev;
1153 fstat(fd, &stb);
1154 if (stb.st_rdev == dev) {
1155 pr_err("backup file must NOT be on the array being reshaped.\n");
1156 close(*fdlist);
1157 return 0;
1158 }
1159
1160 memset(buf, 0, 512);
1161 for (i=0; i < blocks + 8 ; i++) {
1162 if (write(*fdlist, buf, 512) != 512) {
1163 pr_err("%s: cannot create backup file %s: %s\n",
1164 devname, backup_file, strerror(errno));
1165 return 0;
1166 }
1167 }
1168 if (fsync(*fdlist) != 0) {
1169 pr_err("%s: cannot create backup file %s: %s\n",
1170 devname, backup_file, strerror(errno));
1171 return 0;
1172 }
1173
1174 if (!restart && strncmp(backup_file, MAP_DIR, strlen(MAP_DIR)) != 0) {
1175 char *bu = make_backup(sys_name);
1176 if (symlink(backup_file, bu))
1177 pr_err("Recording backup file in " MAP_DIR " failed: %s\n",
1178 strerror(errno));
1179 free(bu);
1180 }
1181
1182 return 1;
1183 }
1184
1185 unsigned long compute_backup_blocks(int nchunk, int ochunk,
1186 unsigned int ndata, unsigned int odata)
1187 {
1188 unsigned long a, b, blocks;
1189 /* So how much do we need to backup.
1190 * We need an amount of data which is both a whole number of
1191 * old stripes and a whole number of new stripes.
1192 * So LCM for (chunksize*datadisks).
1193 */
1194 a = (ochunk/512) * odata;
1195 b = (nchunk/512) * ndata;
1196 /* Find GCD */
1197 a = GCD(a, b);
1198 /* LCM == product / GCD */
1199 blocks = (ochunk/512) * (nchunk/512) * odata * ndata / a;
1200
1201 return blocks;
1202 }
1203
1204 char *analyse_change(char *devname, struct mdinfo *info, struct reshape *re)
1205 {
1206 /* Based on the current array state in info->array and
1207 * the changes in info->new_* etc, determine:
1208 * - whether the change is possible
1209 * - Intermediate level/raid_disks/layout
1210 * - whether a restriping reshape is needed
1211 * - number of sectors in minimum change unit. This
1212 * will cover a whole number of stripes in 'before' and
1213 * 'after'.
1214 *
1215 * Return message if the change should be rejected
1216 * NULL if the change can be achieved
1217 *
1218 * This can be called as part of starting a reshape, or
1219 * when assembling an array that is undergoing reshape.
1220 */
1221 int near, far, offset, copies;
1222 int new_disks;
1223 int old_chunk, new_chunk;
1224 /* delta_parity records change in number of devices
1225 * caused by level change
1226 */
1227 int delta_parity = 0;
1228
1229 memset(re, 0, sizeof(*re));
1230
1231 /* If a new level not explicitly given, we assume no-change */
1232 if (info->new_level == UnSet)
1233 info->new_level = info->array.level;
1234
1235 if (info->new_chunk)
1236 switch (info->new_level) {
1237 case 0:
1238 case 4:
1239 case 5:
1240 case 6:
1241 case 10:
1242 /* chunk size is meaningful, must divide component_size
1243 * evenly
1244 */
1245 if (info->component_size % (info->new_chunk/512)) {
1246 unsigned long long shrink = info->component_size;
1247 shrink &= ~(unsigned long long)(info->new_chunk/512-1);
1248 pr_err("New chunk size (%dK) does not evenly divide device size (%lluk)\n",
1249 info->new_chunk/1024, info->component_size/2);
1250 pr_err("After shrinking any filesystem, \"mdadm --grow %s --size %llu\"\n",
1251 devname, shrink/2);
1252 pr_err("will shrink the array so the given chunk size would work.\n");
1253 return "";
1254 }
1255 break;
1256 default:
1257 return "chunk size not meaningful for this level";
1258 }
1259 else
1260 info->new_chunk = info->array.chunk_size;
1261
1262 switch (info->array.level) {
1263 default:
1264 return "No reshape is possibly for this RAID level";
1265 case LEVEL_LINEAR:
1266 if (info->delta_disks != UnSet)
1267 return "Only --add is supported for LINEAR, setting --raid-disks is not needed";
1268 else
1269 return "Only --add is supported for LINEAR, other --grow options are not meaningful";
1270 case 1:
1271 /* RAID1 can convert to RAID1 with different disks, or
1272 * raid5 with 2 disks, or
1273 * raid0 with 1 disk
1274 */
1275 if (info->new_level > 1 && (info->component_size & 7))
1276 return "Cannot convert RAID1 of this size - reduce size to multiple of 4K first.";
1277 if (info->new_level == 0) {
1278 if (info->delta_disks != UnSet &&
1279 info->delta_disks != 0)
1280 return "Cannot change number of disks with RAID1->RAID0 conversion";
1281 re->level = 0;
1282 re->before.data_disks = 1;
1283 re->after.data_disks = 1;
1284 return NULL;
1285 }
1286 if (info->new_level == 1) {
1287 if (info->delta_disks == UnSet)
1288 /* Don't know what to do */
1289 return "no change requested for Growing RAID1";
1290 re->level = 1;
1291 return NULL;
1292 }
1293 if (info->array.raid_disks != 2 && info->new_level == 5)
1294 return "Can only convert a 2-device array to RAID5";
1295 if (info->array.raid_disks == 2 && info->new_level == 5) {
1296 re->level = 5;
1297 re->before.data_disks = 1;
1298 if (info->delta_disks != UnSet &&
1299 info->delta_disks != 0)
1300 re->after.data_disks = 1 + info->delta_disks;
1301 else
1302 re->after.data_disks = 1;
1303 if (re->after.data_disks < 1)
1304 return "Number of disks too small for RAID5";
1305
1306 re->before.layout = ALGORITHM_LEFT_SYMMETRIC;
1307 info->array.chunk_size = 65536;
1308 break;
1309 }
1310 /* Could do some multi-stage conversions, but leave that to
1311 * later.
1312 */
1313 return "Impossibly level change request for RAID1";
1314
1315 case 10:
1316 /* RAID10 can be converted from near mode to
1317 * RAID0 by removing some devices.
1318 * It can also be reshaped if the kernel supports
1319 * new_data_offset.
1320 */
1321 switch (info->new_level) {
1322 case 0:
1323 if ((info->array.layout & ~0xff) != 0x100)
1324 return "Cannot Grow RAID10 with far/offset layout";
1325 /*
1326 * number of devices must be multiple of
1327 * number of copies
1328 */
1329 if (info->array.raid_disks %
1330 (info->array.layout & 0xff))
1331 return "RAID10 layout too complex for Grow operation";
1332
1333 new_disks = (info->array.raid_disks /
1334 (info->array.layout & 0xff));
1335 if (info->delta_disks == UnSet)
1336 info->delta_disks = (new_disks
1337 - info->array.raid_disks);
1338
1339 if (info->delta_disks !=
1340 new_disks - info->array.raid_disks)
1341 return "New number of raid-devices impossible for RAID10";
1342 if (info->new_chunk &&
1343 info->new_chunk != info->array.chunk_size)
1344 return "Cannot change chunk-size with RAID10 Grow";
1345
1346 /* looks good */
1347 re->level = 0;
1348 re->before.data_disks = new_disks;
1349 re->after.data_disks = re->before.data_disks;
1350 return NULL;
1351
1352 case 10:
1353 near = info->array.layout & 0xff;
1354 far = (info->array.layout >> 8) & 0xff;
1355 offset = info->array.layout & 0x10000;
1356 if (far > 1 && !offset)
1357 return "Cannot reshape RAID10 in far-mode";
1358 copies = near * far;
1359
1360 old_chunk = info->array.chunk_size * far;
1361
1362 if (info->new_layout == UnSet)
1363 info->new_layout = info->array.layout;
1364 else {
1365 near = info->new_layout & 0xff;
1366 far = (info->new_layout >> 8) & 0xff;
1367 offset = info->new_layout & 0x10000;
1368 if (far > 1 && !offset)
1369 return "Cannot reshape RAID10 to far-mode";
1370 if (near * far != copies)
1371 return "Cannot change number of copies when reshaping RAID10";
1372 }
1373 if (info->delta_disks == UnSet)
1374 info->delta_disks = 0;
1375 new_disks = (info->array.raid_disks +
1376 info->delta_disks);
1377
1378 new_chunk = info->new_chunk * far;
1379
1380 re->level = 10;
1381 re->before.layout = info->array.layout;
1382 re->before.data_disks = info->array.raid_disks;
1383 re->after.layout = info->new_layout;
1384 re->after.data_disks = new_disks;
1385 /* For RAID10 we don't do backup but do allow reshape,
1386 * so set backup_blocks to INVALID_SECTORS rather than
1387 * zero.
1388 * And there is no need to synchronise stripes on both
1389 * 'old' and 'new'. So the important
1390 * number is the minimum data_offset difference
1391 * which is the larger of (offset copies * chunk).
1392 */
1393 re->backup_blocks = INVALID_SECTORS;
1394 re->min_offset_change = max(old_chunk, new_chunk) / 512;
1395 if (new_disks < re->before.data_disks &&
1396 info->space_after < re->min_offset_change)
1397 /* Reduce component size by one chunk */
1398 re->new_size = (info->component_size -
1399 re->min_offset_change);
1400 else
1401 re->new_size = info->component_size;
1402 re->new_size = re->new_size * new_disks / copies;
1403 return NULL;
1404
1405 default:
1406 return "RAID10 can only be changed to RAID0";
1407 }
1408 case 0:
1409 /* RAID0 can be converted to RAID10, or to RAID456 */
1410 if (info->new_level == 10) {
1411 if (info->new_layout == UnSet &&
1412 info->delta_disks == UnSet) {
1413 /* Assume near=2 layout */
1414 info->new_layout = 0x102;
1415 info->delta_disks = info->array.raid_disks;
1416 }
1417 if (info->new_layout == UnSet) {
1418 int copies = 1 + (info->delta_disks
1419 / info->array.raid_disks);
1420 if (info->array.raid_disks * (copies-1) !=
1421 info->delta_disks)
1422 return "Impossible number of devices for RAID0->RAID10";
1423 info->new_layout = 0x100 + copies;
1424 }
1425 if (info->delta_disks == UnSet) {
1426 int copies = info->new_layout & 0xff;
1427 if (info->new_layout != 0x100 + copies)
1428 return "New layout impossible for RAID0->RAID10";;
1429 info->delta_disks = (copies - 1) *
1430 info->array.raid_disks;
1431 }
1432 if (info->new_chunk &&
1433 info->new_chunk != info->array.chunk_size)
1434 return "Cannot change chunk-size with RAID0->RAID10";
1435 /* looks good */
1436 re->level = 10;
1437 re->before.data_disks = (info->array.raid_disks +
1438 info->delta_disks);
1439 re->after.data_disks = re->before.data_disks;
1440 re->before.layout = info->new_layout;
1441 return NULL;
1442 }
1443
1444 /* RAID0 can also covert to RAID0/4/5/6 by first converting to
1445 * a raid4 style layout of the final level.
1446 */
1447 switch (info->new_level) {
1448 case 4:
1449 delta_parity = 1;
1450 case 0:
1451 re->level = 4;
1452 re->before.layout = 0;
1453 break;
1454 case 5:
1455 delta_parity = 1;
1456 re->level = 5;
1457 re->before.layout = ALGORITHM_PARITY_N;
1458 if (info->new_layout == UnSet)
1459 info->new_layout = map_name(r5layout, "default");
1460 break;
1461 case 6:
1462 delta_parity = 2;
1463 re->level = 6;
1464 re->before.layout = ALGORITHM_PARITY_N;
1465 if (info->new_layout == UnSet)
1466 info->new_layout = map_name(r6layout, "default");
1467 break;
1468 default:
1469 return "Impossible level change requested";
1470 }
1471 re->before.data_disks = info->array.raid_disks;
1472 /* determining 'after' layout happens outside this 'switch' */
1473 break;
1474
1475 case 4:
1476 info->array.layout = ALGORITHM_PARITY_N;
1477 case 5:
1478 switch (info->new_level) {
1479 case 0:
1480 delta_parity = -1;
1481 case 4:
1482 re->level = info->array.level;
1483 re->before.data_disks = info->array.raid_disks - 1;
1484 re->before.layout = info->array.layout;
1485 break;
1486 case 5:
1487 re->level = 5;
1488 re->before.data_disks = info->array.raid_disks - 1;
1489 re->before.layout = info->array.layout;
1490 break;
1491 case 6:
1492 delta_parity = 1;
1493 re->level = 6;
1494 re->before.data_disks = info->array.raid_disks - 1;
1495 switch (info->array.layout) {
1496 case ALGORITHM_LEFT_ASYMMETRIC:
1497 re->before.layout = ALGORITHM_LEFT_ASYMMETRIC_6;
1498 break;
1499 case ALGORITHM_RIGHT_ASYMMETRIC:
1500 re->before.layout = ALGORITHM_RIGHT_ASYMMETRIC_6;
1501 break;
1502 case ALGORITHM_LEFT_SYMMETRIC:
1503 re->before.layout = ALGORITHM_LEFT_SYMMETRIC_6;
1504 break;
1505 case ALGORITHM_RIGHT_SYMMETRIC:
1506 re->before.layout = ALGORITHM_RIGHT_SYMMETRIC_6;
1507 break;
1508 case ALGORITHM_PARITY_0:
1509 re->before.layout = ALGORITHM_PARITY_0_6;
1510 break;
1511 case ALGORITHM_PARITY_N:
1512 re->before.layout = ALGORITHM_PARITY_N_6;
1513 break;
1514 default:
1515 return "Cannot convert an array with this layout";
1516 }
1517 break;
1518 case 1:
1519 if (info->array.raid_disks != 2)
1520 return "Can only convert a 2-device array to RAID1";
1521 if (info->delta_disks != UnSet &&
1522 info->delta_disks != 0)
1523 return "Cannot set raid_disk when converting RAID5->RAID1";
1524 re->level = 1;
1525 info->new_chunk = 0;
1526 return NULL;
1527 default:
1528 return "Impossible level change requested";
1529 }
1530 break;
1531 case 6:
1532 switch (info->new_level) {
1533 case 4:
1534 case 5:
1535 delta_parity = -1;
1536 case 6:
1537 re->level = 6;
1538 re->before.data_disks = info->array.raid_disks - 2;
1539 re->before.layout = info->array.layout;
1540 break;
1541 default:
1542 return "Impossible level change requested";
1543 }
1544 break;
1545 }
1546
1547 /* If we reached here then it looks like a re-stripe is
1548 * happening. We have determined the intermediate level
1549 * and initial raid_disks/layout and stored these in 're'.
1550 *
1551 * We need to deduce the final layout that can be atomically
1552 * converted to the end state.
1553 */
1554 switch (info->new_level) {
1555 case 0:
1556 /* We can only get to RAID0 from RAID4 or RAID5
1557 * with appropriate layout and one extra device
1558 */
1559 if (re->level != 4 && re->level != 5)
1560 return "Cannot covert to RAID0 from this level";
1561
1562 switch (re->level) {
1563 case 4:
1564 re->before.layout = 0;
1565 re->after.layout = 0;
1566 break;
1567 case 5:
1568 re->after.layout = ALGORITHM_PARITY_N;
1569 break;
1570 }
1571 break;
1572
1573 case 4:
1574 /* We can only get to RAID4 from RAID5 */
1575 if (re->level != 4 && re->level != 5)
1576 return "Cannot convert to RAID4 from this level";
1577
1578 switch (re->level) {
1579 case 4:
1580 re->after.layout = 0;
1581 break;
1582 case 5:
1583 re->after.layout = ALGORITHM_PARITY_N;
1584 break;
1585 }
1586 break;
1587
1588 case 5:
1589 /* We get to RAID5 from RAID5 or RAID6 */
1590 if (re->level != 5 && re->level != 6)
1591 return "Cannot convert to RAID5 from this level";
1592
1593 switch (re->level) {
1594 case 5:
1595 if (info->new_layout == UnSet)
1596 re->after.layout = re->before.layout;
1597 else
1598 re->after.layout = info->new_layout;
1599 break;
1600 case 6:
1601 if (info->new_layout == UnSet)
1602 info->new_layout = re->before.layout;
1603
1604 /* after.layout needs to be raid6 version of new_layout */
1605 if (info->new_layout == ALGORITHM_PARITY_N)
1606 re->after.layout = ALGORITHM_PARITY_N;
1607 else {
1608 char layout[40];
1609 char *ls = map_num(r5layout, info->new_layout);
1610 int l;
1611 if (ls) {
1612 /* Current RAID6 layout has a RAID5
1613 * equivalent - good
1614 */
1615 strcat(strcpy(layout, ls), "-6");
1616 l = map_name(r6layout, layout);
1617 if (l == UnSet)
1618 return "Cannot find RAID6 layout to convert to";
1619 } else {
1620 /* Current RAID6 has no equivalent.
1621 * If it is already a '-6' layout we
1622 * can leave it unchanged, else we must
1623 * fail
1624 */
1625 ls = map_num(r6layout,
1626 info->new_layout);
1627 if (!ls ||
1628 strcmp(ls+strlen(ls)-2, "-6") != 0)
1629 return "Please specify new layout";
1630 l = info->new_layout;
1631 }
1632 re->after.layout = l;
1633 }
1634 }
1635 break;
1636
1637 case 6:
1638 /* We must already be at level 6 */
1639 if (re->level != 6)
1640 return "Impossible level change";
1641 if (info->new_layout == UnSet)
1642 re->after.layout = info->array.layout;
1643 else
1644 re->after.layout = info->new_layout;
1645 break;
1646 default:
1647 return "Impossible level change requested";
1648 }
1649 if (info->delta_disks == UnSet)
1650 info->delta_disks = delta_parity;
1651
1652 re->after.data_disks =
1653 (re->before.data_disks + info->delta_disks - delta_parity);
1654
1655 switch (re->level) {
1656 case 6:
1657 re->parity = 2;
1658 break;
1659 case 4:
1660 case 5:
1661 re->parity = 1;
1662 break;
1663 default:
1664 re->parity = 0;
1665 break;
1666 }
1667 /* So we have a restripe operation, we need to calculate the number
1668 * of blocks per reshape operation.
1669 */
1670 re->new_size = info->component_size * re->before.data_disks;
1671 if (info->new_chunk == 0)
1672 info->new_chunk = info->array.chunk_size;
1673 if (re->after.data_disks == re->before.data_disks &&
1674 re->after.layout == re->before.layout &&
1675 info->new_chunk == info->array.chunk_size) {
1676 /* Nothing to change, can change level immediately. */
1677 re->level = info->new_level;
1678 re->backup_blocks = 0;
1679 return NULL;
1680 }
1681 if (re->after.data_disks == 1 && re->before.data_disks == 1) {
1682 /* chunk and layout changes make no difference */
1683 re->level = info->new_level;
1684 re->backup_blocks = 0;
1685 return NULL;
1686 }
1687
1688 if (re->after.data_disks == re->before.data_disks &&
1689 get_linux_version() < 2006032)
1690 return "in-place reshape is not safe before 2.6.32 - sorry.";
1691
1692 if (re->after.data_disks < re->before.data_disks &&
1693 get_linux_version() < 2006030)
1694 return "reshape to fewer devices is not supported before 2.6.30 - sorry.";
1695
1696 re->backup_blocks = compute_backup_blocks(
1697 info->new_chunk, info->array.chunk_size,
1698 re->after.data_disks, re->before.data_disks);
1699 re->min_offset_change = re->backup_blocks / re->before.data_disks;
1700
1701 re->new_size = info->component_size * re->after.data_disks;
1702 return NULL;
1703 }
1704
1705 static int set_array_size(struct supertype *st, struct mdinfo *sra,
1706 char *text_version)
1707 {
1708 struct mdinfo *info;
1709 char *subarray;
1710 int ret_val = -1;
1711
1712 if ((st == NULL) || (sra == NULL))
1713 return ret_val;
1714
1715 if (text_version == NULL)
1716 text_version = sra->text_version;
1717 subarray = strchr(text_version + 1, '/')+1;
1718 info = st->ss->container_content(st, subarray);
1719 if (info) {
1720 unsigned long long current_size = 0;
1721 unsigned long long new_size = info->custom_array_size/2;
1722
1723 if (sysfs_get_ll(sra, NULL, "array_size", &current_size) == 0 &&
1724 new_size > current_size) {
1725 if (sysfs_set_num(sra, NULL, "array_size", new_size)
1726 < 0)
1727 dprintf("Error: Cannot set array size");
1728 else {
1729 ret_val = 0;
1730 dprintf("Array size changed");
1731 }
1732 dprintf_cont(" from %llu to %llu.\n",
1733 current_size, new_size);
1734 }
1735 sysfs_free(info);
1736 } else
1737 dprintf("Error: set_array_size(): info pointer in NULL\n");
1738
1739 return ret_val;
1740 }
1741
1742 static int reshape_array(char *container, int fd, char *devname,
1743 struct supertype *st, struct mdinfo *info,
1744 int force, struct mddev_dev *devlist,
1745 unsigned long long data_offset,
1746 char *backup_file, int verbose, int forked,
1747 int restart, int freeze_reshape);
1748 static int reshape_container(char *container, char *devname,
1749 int mdfd,
1750 struct supertype *st,
1751 struct mdinfo *info,
1752 int force,
1753 char *backup_file, int verbose,
1754 int forked, int restart, int freeze_reshape);
1755
1756 int Grow_reshape(char *devname, int fd,
1757 struct mddev_dev *devlist,
1758 unsigned long long data_offset,
1759 struct context *c, struct shape *s)
1760 {
1761 /* Make some changes in the shape of an array.
1762 * The kernel must support the change.
1763 *
1764 * There are three different changes. Each can trigger
1765 * a resync or recovery so we freeze that until we have
1766 * requested everything (if kernel supports freezing - 2.6.30).
1767 * The steps are:
1768 * - change size (i.e. component_size)
1769 * - change level
1770 * - change layout/chunksize/ndisks
1771 *
1772 * The last can require a reshape. It is different on different
1773 * levels so we need to check the level before actioning it.
1774 * Some times the level change needs to be requested after the
1775 * reshape (e.g. raid6->raid5, raid5->raid0)
1776 *
1777 */
1778 struct mdu_array_info_s array;
1779 int rv = 0;
1780 struct supertype *st;
1781 char *subarray = NULL;
1782
1783 int frozen;
1784 int changed = 0;
1785 char *container = NULL;
1786 int cfd = -1;
1787
1788 struct mddev_dev *dv;
1789 int added_disks;
1790
1791 struct mdinfo info;
1792 struct mdinfo *sra;
1793
1794 if (md_get_array_info(fd, &array) < 0) {
1795 pr_err("%s is not an active md array - aborting\n",
1796 devname);
1797 return 1;
1798 }
1799 if (s->level != UnSet && s->chunk) {
1800 pr_err("Cannot change array level in the same operation as changing chunk size.\n");
1801 return 1;
1802 }
1803
1804 if (data_offset != INVALID_SECTORS && array.level != 10 &&
1805 (array.level < 4 || array.level > 6)) {
1806 pr_err("--grow --data-offset not yet supported\n");
1807 return 1;
1808 }
1809
1810 if (s->size > 0 &&
1811 (s->chunk || s->level!= UnSet || s->layout_str || s->raiddisks)) {
1812 pr_err("cannot change component size at the same time as other changes.\n"
1813 " Change size first, then check data is intact before making other changes.\n");
1814 return 1;
1815 }
1816
1817 if (s->raiddisks && s->raiddisks < array.raid_disks &&
1818 array.level > 1 && get_linux_version() < 2006032 &&
1819 !check_env("MDADM_FORCE_FEWER")) {
1820 pr_err("reducing the number of devices is not safe before Linux 2.6.32\n"
1821 " Please use a newer kernel\n");
1822 return 1;
1823 }
1824
1825 if (array.level > 1 && s->size > 1 &&
1826 (unsigned long long) (array.chunk_size / 1024) > s->size) {
1827 pr_err("component size must be larger than chunk size.\n");
1828 return 1;
1829 }
1830
1831 st = super_by_fd(fd, &subarray);
1832 if (!st) {
1833 pr_err("Unable to determine metadata format for %s\n", devname);
1834 return 1;
1835 }
1836 if (s->raiddisks > st->max_devs) {
1837 pr_err("Cannot increase raid-disks on this array beyond %d\n", st->max_devs);
1838 return 1;
1839 }
1840 if (s->level == 0 &&
1841 (array.state & (1<<MD_SB_BITMAP_PRESENT)) &&
1842 !(array.state & (1<<MD_SB_CLUSTERED))) {
1843 array.state &= ~(1<<MD_SB_BITMAP_PRESENT);
1844 if (md_set_array_info(fd, &array)!= 0) {
1845 pr_err("failed to remove internal bitmap.\n");
1846 return 1;
1847 }
1848 }
1849
1850 /* in the external case we need to check that the requested reshape is
1851 * supported, and perform an initial check that the container holds the
1852 * pre-requisite spare devices (mdmon owns final validation)
1853 */
1854 if (st->ss->external) {
1855 int retval;
1856
1857 if (subarray) {
1858 container = st->container_devnm;
1859 cfd = open_dev_excl(st->container_devnm);
1860 } else {
1861 container = st->devnm;
1862 close(fd);
1863 cfd = open_dev_excl(st->devnm);
1864 fd = cfd;
1865 }
1866 if (cfd < 0) {
1867 pr_err("Unable to open container for %s\n", devname);
1868 free(subarray);
1869 return 1;
1870 }
1871
1872 retval = st->ss->load_container(st, cfd, NULL);
1873
1874 if (retval) {
1875 pr_err("Cannot read superblock for %s\n", devname);
1876 free(subarray);
1877 return 1;
1878 }
1879
1880 /* check if operation is supported for metadata handler */
1881 if (st->ss->container_content) {
1882 struct mdinfo *cc = NULL;
1883 struct mdinfo *content = NULL;
1884
1885 cc = st->ss->container_content(st, subarray);
1886 for (content = cc; content ; content = content->next) {
1887 int allow_reshape = 1;
1888
1889 /* check if reshape is allowed based on metadata
1890 * indications stored in content.array.status
1891 */
1892 if (content->array.state &
1893 (1 << MD_SB_BLOCK_VOLUME))
1894 allow_reshape = 0;
1895 if (content->array.state &
1896 (1 << MD_SB_BLOCK_CONTAINER_RESHAPE))
1897 allow_reshape = 0;
1898 if (!allow_reshape) {
1899 pr_err("cannot reshape arrays in container with unsupported metadata: %s(%s)\n",
1900 devname, container);
1901 sysfs_free(cc);
1902 free(subarray);
1903 return 1;
1904 }
1905 if (content->consistency_policy ==
1906 CONSISTENCY_POLICY_PPL) {
1907 pr_err("Operation not supported when ppl consistency policy is enabled\n");
1908 sysfs_free(cc);
1909 free(subarray);
1910 return 1;
1911 }
1912 }
1913 sysfs_free(cc);
1914 }
1915 if (mdmon_running(container))
1916 st->update_tail = &st->updates;
1917 }
1918
1919 added_disks = 0;
1920 for (dv = devlist; dv; dv = dv->next)
1921 added_disks++;
1922 if (s->raiddisks > array.raid_disks &&
1923 array.spare_disks + added_disks <
1924 (s->raiddisks - array.raid_disks) &&
1925 !c->force) {
1926 pr_err("Need %d spare%s to avoid degraded array, and only have %d.\n"
1927 " Use --force to over-ride this check.\n",
1928 s->raiddisks - array.raid_disks,
1929 s->raiddisks - array.raid_disks == 1 ? "" : "s",
1930 array.spare_disks + added_disks);
1931 return 1;
1932 }
1933
1934 sra = sysfs_read(fd, NULL, GET_LEVEL | GET_DISKS | GET_DEVS |
1935 GET_STATE | GET_VERSION);
1936 if (sra) {
1937 if (st->ss->external && subarray == NULL) {
1938 array.level = LEVEL_CONTAINER;
1939 sra->array.level = LEVEL_CONTAINER;
1940 }
1941 } else {
1942 pr_err("failed to read sysfs parameters for %s\n",
1943 devname);
1944 return 1;
1945 }
1946 frozen = freeze(st);
1947 if (frozen < -1) {
1948 /* freeze() already spewed the reason */
1949 sysfs_free(sra);
1950 return 1;
1951 } else if (frozen < 0) {
1952 pr_err("%s is performing resync/recovery and cannot be reshaped\n", devname);
1953 sysfs_free(sra);
1954 return 1;
1955 }
1956
1957 /* ========= set size =============== */
1958 if (s->size > 0 &&
1959 (s->size == MAX_SIZE || s->size != (unsigned)array.size)) {
1960 unsigned long long orig_size = get_component_size(fd)/2;
1961 unsigned long long min_csize;
1962 struct mdinfo *mdi;
1963 int raid0_takeover = 0;
1964
1965 if (orig_size == 0)
1966 orig_size = (unsigned) array.size;
1967
1968 if (orig_size == 0) {
1969 pr_err("Cannot set device size in this type of array.\n");
1970 rv = 1;
1971 goto release;
1972 }
1973
1974 if (reshape_super(st, s->size, UnSet, UnSet, 0, 0, UnSet, NULL,
1975 devname, APPLY_METADATA_CHANGES,
1976 c->verbose > 0)) {
1977 rv = 1;
1978 goto release;
1979 }
1980 sync_metadata(st);
1981 if (st->ss->external) {
1982 /* metadata can have size limitation
1983 * update size value according to metadata information
1984 */
1985 struct mdinfo *sizeinfo =
1986 st->ss->container_content(st, subarray);
1987 if (sizeinfo) {
1988 unsigned long long new_size =
1989 sizeinfo->custom_array_size/2;
1990 int data_disks = get_data_disks(
1991 sizeinfo->array.level,
1992 sizeinfo->array.layout,
1993 sizeinfo->array.raid_disks);
1994 new_size /= data_disks;
1995 dprintf("Metadata size correction from %llu to %llu (%llu)\n",
1996 orig_size, new_size,
1997 new_size * data_disks);
1998 s->size = new_size;
1999 sysfs_free(sizeinfo);
2000 }
2001 }
2002
2003 /* Update the size of each member device in case
2004 * they have been resized. This will never reduce
2005 * below the current used-size. The "size" attribute
2006 * understands '0' to mean 'max'.
2007 */
2008 min_csize = 0;
2009 for (mdi = sra->devs; mdi; mdi = mdi->next) {
2010 sysfs_set_num(sra, mdi, "size",
2011 s->size == MAX_SIZE ? 0 : s->size);
2012 if (array.not_persistent == 0 &&
2013 array.major_version == 0 &&
2014 get_linux_version() < 3001000) {
2015 /* Dangerous to allow size to exceed 2TB */
2016 unsigned long long csize;
2017 if (sysfs_get_ll(sra, mdi, "size",
2018 &csize) == 0) {
2019 if (csize >= 2ULL*1024*1024*1024)
2020 csize = 2ULL*1024*1024*1024;
2021 if ((min_csize == 0 ||
2022 (min_csize > csize)))
2023 min_csize = csize;
2024 }
2025 }
2026 }
2027 if (min_csize && s->size > min_csize) {
2028 pr_err("Cannot safely make this array use more than 2TB per device on this kernel.\n");
2029 rv = 1;
2030 goto size_change_error;
2031 }
2032 if (min_csize && s->size == MAX_SIZE) {
2033 /* Don't let the kernel choose a size - it will get
2034 * it wrong
2035 */
2036 pr_err("Limited v0.90 array to 2TB per device\n");
2037 s->size = min_csize;
2038 }
2039 if (st->ss->external) {
2040 if (sra->array.level == 0) {
2041 rv = sysfs_set_str(sra, NULL, "level", "raid5");
2042 if (!rv) {
2043 raid0_takeover = 1;
2044 /* get array parameters after takeover
2045 * to change one parameter at time only
2046 */
2047 rv = md_get_array_info(fd, &array);
2048 }
2049 }
2050 /* make sure mdmon is
2051 * aware of the new level */
2052 if (!mdmon_running(st->container_devnm))
2053 start_mdmon(st->container_devnm);
2054 ping_monitor(container);
2055 if (mdmon_running(st->container_devnm) &&
2056 st->update_tail == NULL)
2057 st->update_tail = &st->updates;
2058 }
2059
2060 if (s->size == MAX_SIZE)
2061 s->size = 0;
2062 array.size = s->size;
2063 if (s->size & ~INT32_MAX) {
2064 /* got truncated to 32bit, write to
2065 * component_size instead
2066 */
2067 if (sra)
2068 rv = sysfs_set_num(sra, NULL,
2069 "component_size", s->size);
2070 else
2071 rv = -1;
2072 } else {
2073 rv = md_set_array_info(fd, &array);
2074
2075 /* manage array size when it is managed externally
2076 */
2077 if ((rv == 0) && st->ss->external)
2078 rv = set_array_size(st, sra, sra->text_version);
2079 }
2080
2081 if (raid0_takeover) {
2082 /* do not recync non-existing parity,
2083 * we will drop it anyway
2084 */
2085 sysfs_set_str(sra, NULL, "sync_action", "frozen");
2086 /* go back to raid0, drop parity disk
2087 */
2088 sysfs_set_str(sra, NULL, "level", "raid0");
2089 md_get_array_info(fd, &array);
2090 }
2091
2092 size_change_error:
2093 if (rv != 0) {
2094 int err = errno;
2095
2096 /* restore metadata */
2097 if (reshape_super(st, orig_size, UnSet, UnSet, 0, 0,
2098 UnSet, NULL, devname,
2099 ROLLBACK_METADATA_CHANGES,
2100 c->verbose) == 0)
2101 sync_metadata(st);
2102 pr_err("Cannot set device size for %s: %s\n",
2103 devname, strerror(err));
2104 if (err == EBUSY &&
2105 (array.state & (1<<MD_SB_BITMAP_PRESENT)))
2106 cont_err("Bitmap must be removed before size can be changed\n");
2107 rv = 1;
2108 goto release;
2109 }
2110 if (s->assume_clean) {
2111 /* This will fail on kernels older than 3.0 unless
2112 * a backport has been arranged.
2113 */
2114 if (sra == NULL ||
2115 sysfs_set_str(sra, NULL, "resync_start",
2116 "none") < 0)
2117 pr_err("--assume-clean not supported with --grow on this kernel\n");
2118 }
2119 md_get_array_info(fd, &array);
2120 s->size = get_component_size(fd)/2;
2121 if (s->size == 0)
2122 s->size = array.size;
2123 if (c->verbose >= 0) {
2124 if (s->size == orig_size)
2125 pr_err("component size of %s unchanged at %lluK\n",
2126 devname, s->size);
2127 else
2128 pr_err("component size of %s has been set to %lluK\n",
2129 devname, s->size);
2130 }
2131 changed = 1;
2132 } else if (array.level != LEVEL_CONTAINER) {
2133 s->size = get_component_size(fd)/2;
2134 if (s->size == 0)
2135 s->size = array.size;
2136 }
2137
2138 /* See if there is anything else to do */
2139 if ((s->level == UnSet || s->level == array.level) &&
2140 (s->layout_str == NULL) &&
2141 (s->chunk == 0 || s->chunk == array.chunk_size) &&
2142 data_offset == INVALID_SECTORS &&
2143 (s->raiddisks == 0 || s->raiddisks == array.raid_disks)) {
2144 /* Nothing more to do */
2145 if (!changed && c->verbose >= 0)
2146 pr_err("%s: no change requested\n", devname);
2147 goto release;
2148 }
2149
2150 /* ========= check for Raid10/Raid1 -> Raid0 conversion ===============
2151 * current implementation assumes that following conditions must be met:
2152 * - RAID10:
2153 * - far_copies == 1
2154 * - near_copies == 2
2155 */
2156 if ((s->level == 0 && array.level == 10 && sra &&
2157 array.layout == ((1 << 8) + 2) && !(array.raid_disks & 1)) ||
2158 (s->level == 0 && array.level == 1 && sra)) {
2159 int err;
2160
2161 err = remove_disks_for_takeover(st, sra, array.layout);
2162 if (err) {
2163 dprintf("Array cannot be reshaped\n");
2164 if (cfd > -1)
2165 close(cfd);
2166 rv = 1;
2167 goto release;
2168 }
2169 /* Make sure mdmon has seen the device removal
2170 * and updated metadata before we continue with
2171 * level change
2172 */
2173 if (container)
2174 ping_monitor(container);
2175 }
2176
2177 memset(&info, 0, sizeof(info));
2178 info.array = array;
2179 if (sysfs_init(&info, fd, NULL)) {
2180 pr_err("failed to intialize sysfs.\n");
2181 rv = 1;
2182 goto release;
2183 }
2184 strcpy(info.text_version, sra->text_version);
2185 info.component_size = s->size*2;
2186 info.new_level = s->level;
2187 info.new_chunk = s->chunk * 1024;
2188 if (info.array.level == LEVEL_CONTAINER) {
2189 info.delta_disks = UnSet;
2190 info.array.raid_disks = s->raiddisks;
2191 } else if (s->raiddisks)
2192 info.delta_disks = s->raiddisks - info.array.raid_disks;
2193 else
2194 info.delta_disks = UnSet;
2195 if (s->layout_str == NULL) {
2196 info.new_layout = UnSet;
2197 if (info.array.level == 6 &&
2198 (info.new_level == 6 || info.new_level == UnSet) &&
2199 info.array.layout >= 16) {
2200 pr_err("%s has a non-standard layout. If you wish to preserve this\n", devname);
2201 cont_err("during the reshape, please specify --layout=preserve\n");
2202 cont_err("If you want to change it, specify a layout or use --layout=normalise\n");
2203 rv = 1;
2204 goto release;
2205 }
2206 } else if (strcmp(s->layout_str, "normalise") == 0 ||
2207 strcmp(s->layout_str, "normalize") == 0) {
2208 /* If we have a -6 RAID6 layout, remove the '-6'. */
2209 info.new_layout = UnSet;
2210 if (info.array.level == 6 && info.new_level == UnSet) {
2211 char l[40], *h;
2212 strcpy(l, map_num(r6layout, info.array.layout));
2213 h = strrchr(l, '-');
2214 if (h && strcmp(h, "-6") == 0) {
2215 *h = 0;
2216 info.new_layout = map_name(r6layout, l);
2217 }
2218 } else {
2219 pr_err("%s is only meaningful when reshaping a RAID6 array.\n", s->layout_str);
2220 rv = 1;
2221 goto release;
2222 }
2223 } else if (strcmp(s->layout_str, "preserve") == 0) {
2224 /* This means that a non-standard RAID6 layout
2225 * is OK.
2226 * In particular:
2227 * - When reshape a RAID6 (e.g. adding a device)
2228 * which is in a non-standard layout, it is OK
2229 * to preserve that layout.
2230 * - When converting a RAID5 to RAID6, leave it in
2231 * the XXX-6 layout, don't re-layout.
2232 */
2233 if (info.array.level == 6 && info.new_level == UnSet)
2234 info.new_layout = info.array.layout;
2235 else if (info.array.level == 5 && info.new_level == 6) {
2236 char l[40];
2237 strcpy(l, map_num(r5layout, info.array.layout));
2238 strcat(l, "-6");
2239 info.new_layout = map_name(r6layout, l);
2240 } else {
2241 pr_err("%s in only meaningful when reshaping to RAID6\n", s->layout_str);
2242 rv = 1;
2243 goto release;
2244 }
2245 } else {
2246 int l = info.new_level;
2247 if (l == UnSet)
2248 l = info.array.level;
2249 switch (l) {
2250 case 5:
2251 info.new_layout = map_name(r5layout, s->layout_str);
2252 break;
2253 case 6:
2254 info.new_layout = map_name(r6layout, s->layout_str);
2255 break;
2256 case 10:
2257 info.new_layout = parse_layout_10(s->layout_str);
2258 break;
2259 case LEVEL_FAULTY:
2260 info.new_layout = parse_layout_faulty(s->layout_str);
2261 break;
2262 default:
2263 pr_err("layout not meaningful with this level\n");
2264 rv = 1;
2265 goto release;
2266 }
2267 if (info.new_layout == UnSet) {
2268 pr_err("layout %s not understood for this level\n",
2269 s->layout_str);
2270 rv = 1;
2271 goto release;
2272 }
2273 }
2274
2275 if (array.level == LEVEL_FAULTY) {
2276 if (s->level != UnSet && s->level != array.level) {
2277 pr_err("cannot change level of Faulty device\n");
2278 rv =1 ;
2279 }
2280 if (s->chunk) {
2281 pr_err("cannot set chunksize of Faulty device\n");
2282 rv =1 ;
2283 }
2284 if (s->raiddisks && s->raiddisks != 1) {
2285 pr_err("cannot set raid_disks of Faulty device\n");
2286 rv =1 ;
2287 }
2288 if (s->layout_str) {
2289 if (md_get_array_info(fd, &array) != 0) {
2290 dprintf("Cannot get array information.\n");
2291 goto release;
2292 }
2293 array.layout = info.new_layout;
2294 if (md_set_array_info(fd, &array) != 0) {
2295 pr_err("failed to set new layout\n");
2296 rv = 1;
2297 } else if (c->verbose >= 0)
2298 printf("layout for %s set to %d\n",
2299 devname, array.layout);
2300 }
2301 } else if (array.level == LEVEL_CONTAINER) {
2302 /* This change is to be applied to every array in the
2303 * container. This is only needed when the metadata imposes
2304 * restraints of the various arrays in the container.
2305 * Currently we only know that IMSM requires all arrays
2306 * to have the same number of devices so changing the
2307 * number of devices (On-Line Capacity Expansion) must be
2308 * performed at the level of the container
2309 */
2310 if (fd > 0) {
2311 close(fd);
2312 fd = -1;
2313 }
2314 rv = reshape_container(container, devname, -1, st, &info,
2315 c->force, c->backup_file, c->verbose,
2316 0, 0, 0);
2317 frozen = 0;
2318 } else {
2319 /* get spare devices from external metadata
2320 */
2321 if (st->ss->external) {
2322 struct mdinfo *info2;
2323
2324 info2 = st->ss->container_content(st, subarray);
2325 if (info2) {
2326 info.array.spare_disks =
2327 info2->array.spare_disks;
2328 sysfs_free(info2);
2329 }
2330 }
2331
2332 /* Impose these changes on a single array. First
2333 * check that the metadata is OK with the change. */
2334
2335 if (reshape_super(st, 0, info.new_level,
2336 info.new_layout, info.new_chunk,
2337 info.array.raid_disks, info.delta_disks,
2338 c->backup_file, devname,
2339 APPLY_METADATA_CHANGES, c->verbose)) {
2340 rv = 1;
2341 goto release;
2342 }
2343 sync_metadata(st);
2344 rv = reshape_array(container, fd, devname, st, &info, c->force,
2345 devlist, data_offset, c->backup_file,
2346 c->verbose, 0, 0, 0);
2347 frozen = 0;
2348 }
2349 release:
2350 sysfs_free(sra);
2351 if (frozen > 0)
2352 unfreeze(st);
2353 return rv;
2354 }
2355
2356 /* verify_reshape_position()
2357 * Function checks if reshape position in metadata is not farther
2358 * than position in md.
2359 * Return value:
2360 * 0 : not valid sysfs entry
2361 * it can be caused by not started reshape, it should be started
2362 * by reshape array or raid0 array is before takeover
2363 * -1 : error, reshape position is obviously wrong
2364 * 1 : success, reshape progress correct or updated
2365 */
2366 static int verify_reshape_position(struct mdinfo *info, int level)
2367 {
2368 int ret_val = 0;
2369 char buf[40];
2370 int rv;
2371
2372 /* read sync_max, failure can mean raid0 array */
2373 rv = sysfs_get_str(info, NULL, "sync_max", buf, 40);
2374
2375 if (rv > 0) {
2376 char *ep;
2377 unsigned long long position = strtoull(buf, &ep, 0);
2378
2379 dprintf("Read sync_max sysfs entry is: %s\n", buf);
2380 if (!(ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' '))) {
2381 position *= get_data_disks(level,
2382 info->new_layout,
2383 info->array.raid_disks);
2384 if (info->reshape_progress < position) {
2385 dprintf("Corrected reshape progress (%llu) to md position (%llu)\n",
2386 info->reshape_progress, position);
2387 info->reshape_progress = position;
2388 ret_val = 1;
2389 } else if (info->reshape_progress > position) {
2390 pr_err("Fatal error: array reshape was not properly frozen (expected reshape position is %llu, but reshape progress is %llu.\n",
2391 position, info->reshape_progress);
2392 ret_val = -1;
2393 } else {
2394 dprintf("Reshape position in md and metadata are the same;");
2395 ret_val = 1;
2396 }
2397 }
2398 } else if (rv == 0) {
2399 /* for valid sysfs entry, 0-length content
2400 * should be indicated as error
2401 */
2402 ret_val = -1;
2403 }
2404
2405 return ret_val;
2406 }
2407
2408 static unsigned long long choose_offset(unsigned long long lo,
2409 unsigned long long hi,
2410 unsigned long long min,
2411 unsigned long long max)
2412 {
2413 /* Choose a new offset between hi and lo.
2414 * It must be between min and max, but
2415 * we would prefer something near the middle of hi/lo, and also
2416 * prefer to be aligned to a big power of 2.
2417 *
2418 * So we start with the middle, then for each bit,
2419 * starting at '1' and increasing, if it is set, we either
2420 * add it or subtract it if possible, preferring the option
2421 * which is furthest from the boundary.
2422 *
2423 * We stop once we get a 1MB alignment. As units are in sectors,
2424 * 1MB = 2*1024 sectors.
2425 */
2426 unsigned long long choice = (lo + hi) / 2;
2427 unsigned long long bit = 1;
2428
2429 for (bit = 1; bit < 2*1024; bit = bit << 1) {
2430 unsigned long long bigger, smaller;
2431 if (! (bit & choice))
2432 continue;
2433 bigger = choice + bit;
2434 smaller = choice - bit;
2435 if (bigger > max && smaller < min)
2436 break;
2437 if (bigger > max)
2438 choice = smaller;
2439 else if (smaller < min)
2440 choice = bigger;
2441 else if (hi - bigger > smaller - lo)
2442 choice = bigger;
2443 else
2444 choice = smaller;
2445 }
2446 return choice;
2447 }
2448
2449 static int set_new_data_offset(struct mdinfo *sra, struct supertype *st,
2450 char *devname, int delta_disks,
2451 unsigned long long data_offset,
2452 unsigned long long min,
2453 int can_fallback)
2454 {
2455 struct mdinfo *sd;
2456 int dir = 0;
2457 int err = 0;
2458 unsigned long long before, after;
2459
2460 /* Need to find min space before and after so same is used
2461 * on all devices
2462 */
2463 before = UINT64_MAX;
2464 after = UINT64_MAX;
2465 for (sd = sra->devs; sd; sd = sd->next) {
2466 char *dn;
2467 int dfd;
2468 int rv;
2469 struct supertype *st2;
2470 struct mdinfo info2;
2471
2472 if (sd->disk.state & (1<<MD_DISK_FAULTY))
2473 continue;
2474 dn = map_dev(sd->disk.major, sd->disk.minor, 0);
2475 dfd = dev_open(dn, O_RDONLY);
2476 if (dfd < 0) {
2477 pr_err("%s: cannot open component %s\n",
2478 devname, dn ? dn : "-unknown-");
2479 goto release;
2480 }
2481 st2 = dup_super(st);
2482 rv = st2->ss->load_super(st2,dfd, NULL);
2483 close(dfd);
2484 if (rv) {
2485 free(st2);
2486 pr_err("%s: cannot get superblock from %s\n",
2487 devname, dn);
2488 goto release;
2489 }
2490 st2->ss->getinfo_super(st2, &info2, NULL);
2491 st2->ss->free_super(st2);
2492 free(st2);
2493 if (info2.space_before == 0 &&
2494 info2.space_after == 0) {
2495 /* Metadata doesn't support data_offset changes */
2496 if (!can_fallback)
2497 pr_err("%s: Metadata version doesn't support data_offset changes\n",
2498 devname);
2499 goto fallback;
2500 }
2501 if (before > info2.space_before)
2502 before = info2.space_before;
2503 if (after > info2.space_after)
2504 after = info2.space_after;
2505
2506 if (data_offset != INVALID_SECTORS) {
2507 if (dir == 0) {
2508 if (info2.data_offset == data_offset) {
2509 pr_err("%s: already has that data_offset\n",
2510 dn);
2511 goto release;
2512 }
2513 if (data_offset < info2.data_offset)
2514 dir = -1;
2515 else
2516 dir = 1;
2517 } else if ((data_offset <= info2.data_offset &&
2518 dir == 1) ||
2519 (data_offset >= info2.data_offset &&
2520 dir == -1)) {
2521 pr_err("%s: differing data offsets on devices make this --data-offset setting impossible\n",
2522 dn);
2523 goto release;
2524 }
2525 }
2526 }
2527 if (before == UINT64_MAX)
2528 /* impossible really, there must be no devices */
2529 return 1;
2530
2531 for (sd = sra->devs; sd; sd = sd->next) {
2532 char *dn = map_dev(sd->disk.major, sd->disk.minor, 0);
2533 unsigned long long new_data_offset;
2534
2535 if (sd->disk.state & (1<<MD_DISK_FAULTY))
2536 continue;
2537 if (delta_disks < 0) {
2538 /* Don't need any space as array is shrinking
2539 * just move data_offset up by min
2540 */
2541 if (data_offset == INVALID_SECTORS)
2542 new_data_offset = sd->data_offset + min;
2543 else {
2544 if (data_offset < sd->data_offset + min) {
2545 pr_err("--data-offset too small for %s\n",
2546 dn);
2547 goto release;
2548 }
2549 new_data_offset = data_offset;
2550 }
2551 } else if (delta_disks > 0) {
2552 /* need space before */
2553 if (before < min) {
2554 if (can_fallback)
2555 goto fallback;
2556 pr_err("Insufficient head-space for reshape on %s\n",
2557 dn);
2558 goto release;
2559 }
2560 if (data_offset == INVALID_SECTORS)
2561 new_data_offset = sd->data_offset - min;
2562 else {
2563 if (data_offset > sd->data_offset - min) {
2564 pr_err("--data-offset too large for %s\n",
2565 dn);
2566 goto release;
2567 }
2568 new_data_offset = data_offset;
2569 }
2570 } else {
2571 if (dir == 0) {
2572 /* can move up or down. If 'data_offset'
2573 * was set we would have already decided,
2574 * so just choose direction with most space.
2575 */
2576 if (before > after)
2577 dir = -1;
2578 else
2579 dir = 1;
2580 }
2581 sysfs_set_str(sra, NULL, "reshape_direction",
2582 dir == 1 ? "backwards" : "forwards");
2583 if (dir > 0) {
2584 /* Increase data offset */
2585 if (after < min) {
2586 if (can_fallback)
2587 goto fallback;
2588 pr_err("Insufficient tail-space for reshape on %s\n",
2589 dn);
2590 goto release;
2591 }
2592 if (data_offset != INVALID_SECTORS &&
2593 data_offset < sd->data_offset + min) {
2594 pr_err("--data-offset too small on %s\n",
2595 dn);
2596 goto release;
2597 }
2598 if (data_offset != INVALID_SECTORS)
2599 new_data_offset = data_offset;
2600 else
2601 new_data_offset = choose_offset(sd->data_offset,
2602 sd->data_offset + after,
2603 sd->data_offset + min,
2604 sd->data_offset + after);
2605 } else {
2606 /* Decrease data offset */
2607 if (before < min) {
2608 if (can_fallback)
2609 goto fallback;
2610 pr_err("insufficient head-room on %s\n",
2611 dn);
2612 goto release;
2613 }
2614 if (data_offset != INVALID_SECTORS &&
2615 data_offset < sd->data_offset - min) {
2616 pr_err("--data-offset too small on %s\n",
2617 dn);
2618 goto release;
2619 }
2620 if (data_offset != INVALID_SECTORS)
2621 new_data_offset = data_offset;
2622 else
2623 new_data_offset = choose_offset(sd->data_offset - before,
2624 sd->data_offset,
2625 sd->data_offset - before,
2626 sd->data_offset - min);
2627 }
2628 }
2629 err = sysfs_set_num(sra, sd, "new_offset", new_data_offset);
2630 if (err < 0 && errno == E2BIG) {
2631 /* try again after increasing data size to max */
2632 err = sysfs_set_num(sra, sd, "size", 0);
2633 if (err < 0 && errno == EINVAL &&
2634 !(sd->disk.state & (1<<MD_DISK_SYNC))) {
2635 /* some kernels have a bug where you cannot
2636 * use '0' on spare devices. */
2637 sysfs_set_num(sra, sd, "size",
2638 (sra->component_size + after)/2);
2639 }
2640 err = sysfs_set_num(sra, sd, "new_offset",
2641 new_data_offset);
2642 }
2643 if (err < 0) {
2644 if (errno == E2BIG && data_offset != INVALID_SECTORS) {
2645 pr_err("data-offset is too big for %s\n", dn);
2646 goto release;
2647 }
2648 if (sd == sra->devs &&
2649 (errno == ENOENT || errno == E2BIG))
2650 /* Early kernel, no 'new_offset' file,
2651 * or kernel doesn't like us.
2652 * For RAID5/6 this is not fatal
2653 */
2654 return 1;
2655 pr_err("Cannot set new_offset for %s\n", dn);
2656 break;
2657 }
2658 }
2659 return err;
2660 release:
2661 return -1;
2662 fallback:
2663 /* Just use a backup file */
2664 return 1;
2665 }
2666
2667 static int raid10_reshape(char *container, int fd, char *devname,
2668 struct supertype *st, struct mdinfo *info,
2669 struct reshape *reshape,
2670 unsigned long long data_offset,
2671 int force, int verbose)
2672 {
2673 /* Changing raid_disks, layout, chunksize or possibly
2674 * just data_offset for a RAID10.
2675 * We must always change data_offset. We change by at least
2676 * ->min_offset_change which is the largest of the old and new
2677 * chunk sizes.
2678 * If raid_disks is increasing, then data_offset must decrease
2679 * by at least this copy size.
2680 * If raid_disks is unchanged, data_offset must increase or
2681 * decrease by at least min_offset_change but preferably by much more.
2682 * We choose half of the available space.
2683 * If raid_disks is decreasing, data_offset must increase by
2684 * at least min_offset_change. To allow of this, component_size
2685 * must be decreased by the same amount.
2686 *
2687 * So we calculate the required minimum and direction, possibly
2688 * reduce the component_size, then iterate through the devices
2689 * and set the new_data_offset.
2690 * If that all works, we set chunk_size, layout, raid_disks, and start
2691 * 'reshape'
2692 */
2693 struct mdinfo *sra;
2694 unsigned long long min;
2695 int err = 0;
2696
2697 sra = sysfs_read(fd, NULL,
2698 GET_COMPONENT|GET_DEVS|GET_OFFSET|GET_STATE|GET_CHUNK
2699 );
2700 if (!sra) {
2701 pr_err("%s: Cannot get array details from sysfs\n", devname);
2702 goto release;
2703 }
2704 min = reshape->min_offset_change;
2705
2706 if (info->delta_disks)
2707 sysfs_set_str(sra, NULL, "reshape_direction",
2708 info->delta_disks < 0 ? "backwards" : "forwards");
2709 if (info->delta_disks < 0 && info->space_after < min) {
2710 int rv = sysfs_set_num(sra, NULL, "component_size",
2711 (sra->component_size - min)/2);
2712 if (rv) {
2713 pr_err("cannot reduce component size\n");
2714 goto release;
2715 }
2716 }
2717 err = set_new_data_offset(sra, st, devname, info->delta_disks,
2718 data_offset, min, 0);
2719 if (err == 1) {
2720 pr_err("Cannot set new_data_offset: RAID10 reshape not\n");
2721 cont_err("supported on this kernel\n");
2722 err = -1;
2723 }
2724 if (err < 0)
2725 goto release;
2726
2727 if (!err && sysfs_set_num(sra, NULL, "chunk_size", info->new_chunk) < 0)
2728 err = errno;
2729 if (!err && sysfs_set_num(sra, NULL, "layout",
2730 reshape->after.layout) < 0)
2731 err = errno;
2732 if (!err &&
2733 sysfs_set_num(sra, NULL, "raid_disks",
2734 info->array.raid_disks + info->delta_disks) < 0)
2735 err = errno;
2736 if (!err && sysfs_set_str(sra, NULL, "sync_action", "reshape") < 0)
2737 err = errno;
2738 if (err) {
2739 pr_err("Cannot set array shape for %s\n",
2740 devname);
2741 if (err == EBUSY &&
2742 (info->array.state & (1<<MD_SB_BITMAP_PRESENT)))
2743 cont_err(" Bitmap must be removed before shape can be changed\n");
2744 goto release;
2745 }
2746 sysfs_free(sra);
2747 return 0;
2748 release:
2749 sysfs_free(sra);
2750 return 1;
2751 }
2752
2753 static void get_space_after(int fd, struct supertype *st, struct mdinfo *info)
2754 {
2755 struct mdinfo *sra, *sd;
2756 /* Initialisation to silence compiler warning */
2757 unsigned long long min_space_before = 0, min_space_after = 0;
2758 int first = 1;
2759
2760 sra = sysfs_read(fd, NULL, GET_DEVS);
2761 if (!sra)
2762 return;
2763 for (sd = sra->devs; sd; sd = sd->next) {
2764 char *dn;
2765 int dfd;
2766 struct supertype *st2;
2767 struct mdinfo info2;
2768
2769 if (sd->disk.state & (1<<MD_DISK_FAULTY))
2770 continue;
2771 dn = map_dev(sd->disk.major, sd->disk.minor, 0);
2772 dfd = dev_open(dn, O_RDONLY);
2773 if (dfd < 0)
2774 break;
2775 st2 = dup_super(st);
2776 if (st2->ss->load_super(st2,dfd, NULL)) {
2777 close(dfd);
2778 free(st2);
2779 break;
2780 }
2781 close(dfd);
2782 st2->ss->getinfo_super(st2, &info2, NULL);
2783 st2->ss->free_super(st2);
2784 free(st2);
2785 if (first ||
2786 min_space_before > info2.space_before)
2787 min_space_before = info2.space_before;
2788 if (first ||
2789 min_space_after > info2.space_after)
2790 min_space_after = info2.space_after;
2791 first = 0;
2792 }
2793 if (sd == NULL && !first) {
2794 info->space_after = min_space_after;
2795 info->space_before = min_space_before;
2796 }
2797 sysfs_free(sra);
2798 }
2799
2800 static void update_cache_size(char *container, struct mdinfo *sra,
2801 struct mdinfo *info,
2802 int disks, unsigned long long blocks)
2803 {
2804 /* Check that the internal stripe cache is
2805 * large enough, or it won't work.
2806 * It must hold at least 4 stripes of the larger
2807 * chunk size
2808 */
2809 unsigned long cache;
2810 cache = max(info->array.chunk_size, info->new_chunk);
2811 cache *= 4; /* 4 stripes minimum */
2812 cache /= 512; /* convert to sectors */
2813 /* make sure there is room for 'blocks' with a bit to spare */
2814 if (cache < 16 + blocks / disks)
2815 cache = 16 + blocks / disks;
2816 cache /= (4096/512); /* Convert from sectors to pages */
2817
2818 if (sra->cache_size < cache)
2819 subarray_set_num(container, sra, "stripe_cache_size",
2820 cache+1);
2821 }
2822
2823 static int impose_reshape(struct mdinfo *sra,
2824 struct mdinfo *info,
2825 struct supertype *st,
2826 int fd,
2827 int restart,
2828 char *devname, char *container,
2829 struct reshape *reshape)
2830 {
2831 struct mdu_array_info_s array;
2832
2833 sra->new_chunk = info->new_chunk;
2834
2835 if (restart) {
2836 /* for external metadata checkpoint saved by mdmon can be lost
2837 * or missed /due to e.g. crash/. Check if md is not during
2838 * restart farther than metadata points to.
2839 * If so, this means metadata information is obsolete.
2840 */
2841 if (st->ss->external)
2842 verify_reshape_position(info, reshape->level);
2843 sra->reshape_progress = info->reshape_progress;
2844 } else {
2845 sra->reshape_progress = 0;
2846 if (reshape->after.data_disks < reshape->before.data_disks)
2847 /* start from the end of the new array */
2848 sra->reshape_progress = (sra->component_size
2849 * reshape->after.data_disks);
2850 }
2851
2852 md_get_array_info(fd, &array);
2853 if (info->array.chunk_size == info->new_chunk &&
2854 reshape->before.layout == reshape->after.layout &&
2855 st->ss->external == 0) {
2856 /* use SET_ARRAY_INFO but only if reshape hasn't started */
2857 array.raid_disks = reshape->after.data_disks + reshape->parity;
2858 if (!restart && md_set_array_info(fd, &array) != 0) {
2859 int err = errno;
2860
2861 pr_err("Cannot set device shape for %s: %s\n",
2862 devname, strerror(errno));
2863
2864 if (err == EBUSY &&
2865 (array.state & (1<<MD_SB_BITMAP_PRESENT)))
2866 cont_err("Bitmap must be removed before shape can be changed\n");
2867
2868 goto release;
2869 }
2870 } else if (!restart) {
2871 /* set them all just in case some old 'new_*' value
2872 * persists from some earlier problem.
2873 */
2874 int err = 0;
2875 if (sysfs_set_num(sra, NULL, "chunk_size", info->new_chunk) < 0)
2876 err = errno;
2877 if (!err && sysfs_set_num(sra, NULL, "layout",
2878 reshape->after.layout) < 0)
2879 err = errno;
2880 if (!err && subarray_set_num(container, sra, "raid_disks",
2881 reshape->after.data_disks +
2882 reshape->parity) < 0)
2883 err = errno;
2884 if (err) {
2885 pr_err("Cannot set device shape for %s\n", devname);
2886
2887 if (err == EBUSY &&
2888 (array.state & (1<<MD_SB_BITMAP_PRESENT)))
2889 cont_err("Bitmap must be removed before shape can be changed\n");
2890 goto release;
2891 }
2892 }
2893 return 0;
2894 release:
2895 return -1;
2896 }
2897
2898 static int impose_level(int fd, int level, char *devname, int verbose)
2899 {
2900 char *c;
2901 struct mdu_array_info_s array;
2902 struct mdinfo info;
2903
2904 if (sysfs_init(&info, fd, NULL)) {
2905 pr_err("failed to intialize sysfs.\n");
2906 return 1;
2907 }
2908
2909 md_get_array_info(fd, &array);
2910 if (level == 0 && (array.level >= 4 && array.level <= 6)) {
2911 /* To convert to RAID0 we need to fail and
2912 * remove any non-data devices. */
2913 int found = 0;
2914 int d;
2915 int data_disks = array.raid_disks - 1;
2916 if (array.level == 6)
2917 data_disks -= 1;
2918 if (array.level == 5 && array.layout != ALGORITHM_PARITY_N)
2919 return -1;
2920 if (array.level == 6 && array.layout != ALGORITHM_PARITY_N_6)
2921 return -1;
2922 sysfs_set_str(&info, NULL,"sync_action", "idle");
2923 /* First remove any spares so no recovery starts */
2924 for (d = 0, found = 0;
2925 d < MAX_DISKS && found < array.nr_disks; d++) {
2926 mdu_disk_info_t disk;
2927 disk.number = d;
2928 if (md_get_disk_info(fd, &disk) < 0)
2929 continue;
2930 if (disk.major == 0 && disk.minor == 0)
2931 continue;
2932 found++;
2933 if ((disk.state & (1 << MD_DISK_ACTIVE)) &&
2934 disk.raid_disk < data_disks)
2935 /* keep this */
2936 continue;
2937 ioctl(fd, HOT_REMOVE_DISK,
2938 makedev(disk.major, disk.minor));
2939 }
2940 /* Now fail anything left */
2941 md_get_array_info(fd, &array);
2942 for (d = 0, found = 0;
2943 d < MAX_DISKS && found < array.nr_disks; d++) {
2944 mdu_disk_info_t disk;
2945 disk.number = d;
2946 if (md_get_disk_info(fd, &disk) < 0)
2947 continue;
2948 if (disk.major == 0 && disk.minor == 0)
2949 continue;
2950 found++;
2951 if ((disk.state & (1 << MD_DISK_ACTIVE)) &&
2952 disk.raid_disk < data_disks)
2953 /* keep this */
2954 continue;
2955 ioctl(fd, SET_DISK_FAULTY,
2956 makedev(disk.major, disk.minor));
2957 hot_remove_disk(fd, makedev(disk.major, disk.minor), 1);
2958 }
2959 }
2960 c = map_num(pers, level);
2961 if (c) {
2962 int err = sysfs_set_str(&info, NULL, "level", c);
2963 if (err) {
2964 err = errno;
2965 pr_err("%s: could not set level to %s\n",
2966 devname, c);
2967 if (err == EBUSY &&
2968 (array.state & (1<<MD_SB_BITMAP_PRESENT)))
2969 cont_err("Bitmap must be removed before level can be changed\n");
2970 return err;
2971 }
2972 if (verbose >= 0)
2973 pr_err("level of %s changed to %s\n", devname, c);
2974 }
2975 return 0;
2976 }
2977
2978 int sigterm = 0;
2979 static void catch_term(int sig)
2980 {
2981 sigterm = 1;
2982 }
2983
2984 static int continue_via_systemd(char *devnm)
2985 {
2986 int skipped, i, pid, status;
2987 char pathbuf[1024];
2988 /* In a systemd/udev world, it is best to get systemd to
2989 * run "mdadm --grow --continue" rather than running in the
2990 * background.
2991 */
2992 switch(fork()) {
2993 case 0:
2994 /* FIXME yuk. CLOSE_EXEC?? */
2995 skipped = 0;
2996 for (i = 3; skipped < 20; i++)
2997 if (close(i) < 0)
2998 skipped++;
2999 else
3000 skipped = 0;
3001
3002 /* Don't want to see error messages from
3003 * systemctl. If the service doesn't exist,
3004 * we fork ourselves.
3005 */
3006 close(2);
3007 open("/dev/null", O_WRONLY);
3008 snprintf(pathbuf, sizeof(pathbuf),
3009 "mdadm-grow-continue@%s.service", devnm);
3010 status = execl("/usr/bin/systemctl", "systemctl", "restart",
3011 pathbuf, NULL);
3012 status = execl("/bin/systemctl", "systemctl", "restart",
3013 pathbuf, NULL);
3014 exit(1);
3015 case -1: /* Just do it ourselves. */
3016 break;
3017 default: /* parent - good */
3018 pid = wait(&status);
3019 if (pid >= 0 && status == 0)
3020 return 1;
3021 }
3022 return 0;
3023 }
3024
3025 static int reshape_array(char *container, int fd, char *devname,
3026 struct supertype *st, struct mdinfo *info,
3027 int force, struct mddev_dev *devlist,
3028 unsigned long long data_offset,
3029 char *backup_file, int verbose, int forked,
3030 int restart, int freeze_reshape)
3031 {
3032 struct reshape reshape;
3033 int spares_needed;
3034 char *msg;
3035 int orig_level = UnSet;
3036 int odisks;
3037 int delayed;
3038
3039 struct mdu_array_info_s array;
3040 char *c;
3041
3042 struct mddev_dev *dv;
3043 int added_disks;
3044
3045 int *fdlist = NULL;
3046 unsigned long long *offsets = NULL;
3047 int d;
3048 int nrdisks;
3049 int err;
3050 unsigned long blocks;
3051 unsigned long long array_size;
3052 int done;
3053 struct mdinfo *sra = NULL;
3054 char buf[20];
3055
3056 /* when reshaping a RAID0, the component_size might be zero.
3057 * So try to fix that up.
3058 */
3059 if (md_get_array_info(fd, &array) != 0) {
3060 dprintf("Cannot get array information.\n");
3061 goto release;
3062 }
3063 if (array.level == 0 && info->component_size == 0) {
3064 get_dev_size(fd, NULL, &array_size);
3065 info->component_size = array_size / array.raid_disks;
3066 }
3067
3068 if (array.level == 10)
3069 /* Need space_after info */
3070 get_space_after(fd, st, info);
3071
3072 if (info->reshape_active) {
3073 int new_level = info->new_level;
3074 info->new_level = UnSet;
3075 if (info->delta_disks > 0)
3076 info->array.raid_disks -= info->delta_disks;
3077 msg = analyse_change(devname, info, &reshape);
3078 info->new_level = new_level;
3079 if (info->delta_disks > 0)
3080 info->array.raid_disks += info->delta_disks;
3081 if (!restart)
3082 /* Make sure the array isn't read-only */
3083 ioctl(fd, RESTART_ARRAY_RW, 0);
3084 } else
3085 msg = analyse_change(devname, info, &reshape);
3086 if (msg) {
3087 /* if msg == "", error has already been printed */
3088 if (msg[0])
3089 pr_err("%s\n", msg);
3090 goto release;
3091 }
3092 if (restart && (reshape.level != info->array.level ||
3093 reshape.before.layout != info->array.layout ||
3094 reshape.before.data_disks + reshape.parity !=
3095 info->array.raid_disks - max(0, info->delta_disks))) {
3096 pr_err("reshape info is not in native format - cannot continue.\n");
3097 goto release;
3098 }
3099
3100 if (st->ss->external && restart && (info->reshape_progress == 0) &&
3101 !((sysfs_get_str(info, NULL, "sync_action",
3102 buf, sizeof(buf)) > 0) &&
3103 (strncmp(buf, "reshape", 7) == 0))) {
3104 /* When reshape is restarted from '0', very begin of array
3105 * it is possible that for external metadata reshape and array
3106 * configuration doesn't happen.
3107 * Check if md has the same opinion, and reshape is restarted
3108 * from 0. If so, this is regular reshape start after reshape
3109 * switch in metadata to next array only.
3110 */
3111 if ((verify_reshape_position(info, reshape.level) >= 0) &&
3112 (info->reshape_progress == 0))
3113 restart = 0;
3114 }
3115 if (restart) {
3116 /*
3117 * reshape already started. just skip to monitoring
3118 * the reshape
3119 */
3120 if (reshape.backup_blocks == 0)
3121 return 0;
3122 if (restart & RESHAPE_NO_BACKUP)
3123 return 0;
3124
3125 /* Need 'sra' down at 'started:' */
3126 sra = sysfs_read(fd, NULL,
3127 GET_COMPONENT|GET_DEVS|GET_OFFSET|GET_STATE|
3128 GET_CHUNK|GET_CACHE);
3129 if (!sra) {
3130 pr_err("%s: Cannot get array details from sysfs\n",
3131 devname);
3132 goto release;
3133 }
3134
3135 if (!backup_file)
3136 backup_file = locate_backup(sra->sys_name);
3137
3138 goto started;
3139 }
3140 /* The container is frozen but the array may not be.
3141 * So freeze the array so spares don't get put to the wrong use
3142 * FIXME there should probably be a cleaner separation between
3143 * freeze_array and freeze_container.
3144 */
3145 sysfs_freeze_array(info);
3146 /* Check we have enough spares to not be degraded */
3147 added_disks = 0;
3148 for (dv = devlist; dv ; dv=dv->next)
3149 added_disks++;
3150 spares_needed = max(reshape.before.data_disks,
3151 reshape.after.data_disks) +
3152 reshape.parity - array.raid_disks;
3153
3154 if (!force && info->new_level > 1 && info->array.level > 1 &&
3155 spares_needed > info->array.spare_disks + added_disks) {
3156 pr_err("Need %d spare%s to avoid degraded array, and only have %d.\n"
3157 " Use --force to over-ride this check.\n",
3158 spares_needed,
3159 spares_needed == 1 ? "" : "s",
3160 info->array.spare_disks + added_disks);
3161 goto release;
3162 }
3163 /* Check we have enough spares to not fail */
3164 spares_needed = max(reshape.before.data_disks,
3165 reshape.after.data_disks)
3166 - array.raid_disks;
3167 if ((info->new_level > 1 || info->new_level == 0) &&
3168 spares_needed > info->array.spare_disks +added_disks) {
3169 pr_err("Need %d spare%s to create working array, and only have %d.\n",
3170 spares_needed, spares_needed == 1 ? "" : "s",
3171 info->array.spare_disks + added_disks);
3172 goto release;
3173 }
3174
3175 if (reshape.level != array.level) {
3176 int err = impose_level(fd, reshape.level, devname, verbose);
3177 if (err)
3178 goto release;
3179 info->new_layout = UnSet; /* after level change,
3180 * layout is meaningless */
3181 orig_level = array.level;
3182 sysfs_freeze_array(info);
3183
3184 if (reshape.level > 0 && st->ss->external) {
3185 /* make sure mdmon is aware of the new level */
3186 if (mdmon_running(container))
3187 flush_mdmon(container);
3188
3189 if (!mdmon_running(container))
3190 start_mdmon(container);
3191 ping_monitor(container);
3192 if (mdmon_running(container) && st->update_tail == NULL)
3193 st->update_tail = &st->updates;
3194 }
3195 }
3196 /* ->reshape_super might have chosen some spares from the
3197 * container that it wants to be part of the new array.
3198 * We can collect them with ->container_content and give
3199 * them to the kernel.
3200 */
3201 if (st->ss->reshape_super && st->ss->container_content) {
3202 char *subarray = strchr(info->text_version+1, '/')+1;
3203 struct mdinfo *info2 =
3204 st->ss->container_content(st, subarray);
3205 struct mdinfo *d;
3206
3207 if (info2) {
3208 if (sysfs_init(info2, fd, st->devnm)) {
3209 pr_err("unable to initialize sysfs for %s\n",
3210 st->devnm);
3211 free(info2);
3212 goto release;
3213 }
3214 /* When increasing number of devices, we need to set
3215 * new raid_disks before adding these, or they might
3216 * be rejected.
3217 */
3218 if (reshape.backup_blocks &&
3219 reshape.after.data_disks >
3220 reshape.before.data_disks)
3221 subarray_set_num(container, info2, "raid_disks",
3222 reshape.after.data_disks +
3223 reshape.parity);
3224 for (d = info2->devs; d; d = d->next) {
3225 if (d->disk.state == 0 &&
3226 d->disk.raid_disk >= 0) {
3227 /* This is a spare that wants to
3228 * be part of the array.
3229 */
3230 add_disk(fd, st, info2, d);
3231 }
3232 }
3233 sysfs_free(info2);
3234 }
3235 }
3236 /* We might have been given some devices to add to the
3237 * array. Now that the array has been changed to the right
3238 * level and frozen, we can safely add them.
3239 */
3240 if (devlist) {
3241 if (Manage_subdevs(devname, fd, devlist, verbose, 0, NULL, 0))
3242 goto release;
3243 }
3244
3245 if (reshape.backup_blocks == 0 && data_offset != INVALID_SECTORS)
3246 reshape.backup_blocks = reshape.before.data_disks * info->array.chunk_size/512;
3247 if (reshape.backup_blocks == 0) {
3248 /* No restriping needed, but we might need to impose
3249 * some more changes: layout, raid_disks, chunk_size
3250 */
3251 /* read current array info */
3252 if (md_get_array_info(fd, &array) != 0) {
3253 dprintf("Cannot get array information.\n");
3254 goto release;
3255 }
3256 /* compare current array info with new values and if
3257 * it is different update them to new */
3258 if (info->new_layout != UnSet &&
3259 info->new_layout != array.layout) {
3260 array.layout = info->new_layout;
3261 if (md_set_array_info(fd, &array) != 0) {
3262 pr_err("failed to set new layout\n");
3263 goto release;
3264 } else if (verbose >= 0)
3265 printf("layout for %s set to %d\n",
3266 devname, array.layout);
3267 }
3268 if (info->delta_disks != UnSet && info->delta_disks != 0 &&
3269 array.raid_disks !=
3270 (info->array.raid_disks + info->delta_disks)) {
3271 array.raid_disks += info->delta_disks;
3272 if (md_set_array_info(fd, &array) != 0) {
3273 pr_err("failed to set raid disks\n");
3274 goto release;
3275 } else if (verbose >= 0) {
3276 printf("raid_disks for %s set to %d\n",
3277 devname, array.raid_disks);
3278 }
3279 }
3280 if (info->new_chunk != 0 &&
3281 info->new_chunk != array.chunk_size) {
3282 if (sysfs_set_num(info, NULL,
3283 "chunk_size", info->new_chunk) != 0) {
3284 pr_err("failed to set chunk size\n");
3285 goto release;
3286 } else if (verbose >= 0)
3287 printf("chunk size for %s set to %d\n",
3288 devname, array.chunk_size);
3289 }
3290 unfreeze(st);
3291 return 0;
3292 }
3293
3294 /*
3295 * There are three possibilities.
3296 * 1/ The array will shrink.
3297 * We need to ensure the reshape will pause before reaching
3298 * the 'critical section'. We also need to fork and wait for
3299 * that to happen. When it does we
3300 * suspend/backup/complete/unfreeze
3301 *
3302 * 2/ The array will not change size.
3303 * This requires that we keep a backup of a sliding window
3304 * so that we can restore data after a crash. So we need
3305 * to fork and monitor progress.
3306 * In future we will allow the data_offset to change, so
3307 * a sliding backup becomes unnecessary.
3308 *
3309 * 3/ The array will grow. This is relatively easy.
3310 * However the kernel's restripe routines will cheerfully
3311 * overwrite some early data before it is safe. So we
3312 * need to make a backup of the early parts of the array
3313 * and be ready to restore it if rebuild aborts very early.
3314 * For externally managed metadata, we still need a forked
3315 * child to monitor the reshape and suspend IO over the region
3316 * that is being reshaped.
3317 *
3318 * We backup data by writing it to one spare, or to a
3319 * file which was given on command line.
3320 *
3321 * In each case, we first make sure that storage is available
3322 * for the required backup.
3323 * Then we:
3324 * - request the shape change.
3325 * - fork to handle backup etc.
3326 */
3327 /* Check that we can hold all the data */
3328 get_dev_size(fd, NULL, &array_size);
3329 if (reshape.new_size < (array_size/512)) {
3330 pr_err("this change will reduce the size of the array.\n"
3331 " use --grow --array-size first to truncate array.\n"
3332 " e.g. mdadm --grow %s --array-size %llu\n",
3333 devname, reshape.new_size/2);
3334 goto release;
3335 }
3336
3337 if (array.level == 10) {
3338 /* Reshaping RAID10 does not require any data backup by
3339 * user-space. Instead it requires that the data_offset
3340 * is changed to avoid the need for backup.
3341 * So this is handled very separately
3342 */
3343 if (restart)
3344 /* Nothing to do. */
3345 return 0;
3346 return raid10_reshape(container, fd, devname, st, info,
3347 &reshape, data_offset, force, verbose);
3348 }
3349 sra = sysfs_read(fd, NULL,
3350 GET_COMPONENT|GET_DEVS|GET_OFFSET|GET_STATE|GET_CHUNK|
3351 GET_CACHE);
3352 if (!sra) {
3353 pr_err("%s: Cannot get array details from sysfs\n",
3354 devname);
3355 goto release;
3356 }
3357
3358 if (!backup_file)
3359 switch(set_new_data_offset(sra, st, devname,
3360 reshape.after.data_disks - reshape.before.data_disks,
3361 data_offset,
3362 reshape.min_offset_change, 1)) {
3363 case -1:
3364 goto release;
3365 case 0:
3366 /* Updated data_offset, so it's easy now */
3367 update_cache_size(container, sra, info,
3368 min(reshape.before.data_disks,
3369 reshape.after.data_disks),
3370 reshape.backup_blocks);
3371
3372 /* Right, everything seems fine. Let's kick things off.
3373 */
3374 sync_metadata(st);
3375
3376 if (impose_reshape(sra, info, st, fd, restart,
3377 devname, container, &reshape) < 0)
3378 goto release;
3379 if (sysfs_set_str(sra, NULL, "sync_action", "reshape") < 0) {
3380 struct mdinfo *sd;
3381 if (errno != EINVAL) {
3382 pr_err("Failed to initiate reshape!\n");
3383 goto release;
3384 }
3385 /* revert data_offset and try the old way */
3386 for (sd = sra->devs; sd; sd = sd->next) {
3387 sysfs_set_num(sra, sd, "new_offset",
3388 sd->data_offset);
3389 sysfs_set_str(sra, NULL, "reshape_direction",
3390 "forwards");
3391 }
3392 break;
3393 }
3394 if (info->new_level == reshape.level)
3395 return 0;
3396 /* need to adjust level when reshape completes */
3397 switch(fork()) {
3398 case -1: /* ignore error, but don't wait */
3399 return 0;
3400 default: /* parent */
3401 return 0;
3402 case 0:
3403 map_fork();
3404 break;
3405 }
3406 close(fd);
3407 wait_reshape(sra);
3408 fd = open_dev(sra->sys_name);
3409 if (fd >= 0)
3410 impose_level(fd, info->new_level, devname, verbose);
3411 return 0;
3412 case 1: /* Couldn't set data_offset, try the old way */
3413 if (data_offset != INVALID_SECTORS) {
3414 pr_err("Cannot update data_offset on this array\n");
3415 goto release;
3416 }
3417 break;
3418 }
3419
3420 started:
3421 /* Decide how many blocks (sectors) for a reshape
3422 * unit. The number we have so far is just a minimum
3423 */
3424 blocks = reshape.backup_blocks;
3425 if (reshape.before.data_disks ==
3426 reshape.after.data_disks) {
3427 /* Make 'blocks' bigger for better throughput, but
3428 * not so big that we reject it below.
3429 * Try for 16 megabytes
3430 */
3431 while (blocks * 32 < sra->component_size && blocks < 16*1024*2)
3432 blocks *= 2;
3433 } else
3434 pr_err("Need to backup %luK of critical section..\n", blocks/2);
3435
3436 if (blocks >= sra->component_size/2) {
3437 pr_err("%s: Something wrong - reshape aborted\n", devname);
3438 goto release;
3439 }
3440
3441 /* Now we need to open all these devices so we can read/write.
3442 */
3443 nrdisks = max(reshape.before.data_disks,
3444 reshape.after.data_disks) + reshape.parity
3445 + sra->array.spare_disks;
3446 fdlist = xcalloc((1+nrdisks), sizeof(int));
3447 offsets = xcalloc((1+nrdisks), sizeof(offsets[0]));
3448
3449 odisks = reshape.before.data_disks + reshape.parity;
3450 d = reshape_prepare_fdlist(devname, sra, odisks, nrdisks, blocks,
3451 backup_file, fdlist, offsets);
3452 if (d < odisks) {
3453 goto release;
3454 }
3455 if ((st->ss->manage_reshape == NULL) ||
3456 (st->ss->recover_backup == NULL)) {
3457 if (backup_file == NULL) {
3458 if (reshape.after.data_disks <=
3459 reshape.before.data_disks) {
3460 pr_err("%s: Cannot grow - need backup-file\n",
3461 devname);
3462 pr_err(" Please provide one with \"--backup=...\"\n");
3463 goto release;
3464 } else if (d == odisks) {
3465 pr_err("%s: Cannot grow - need a spare or backup-file to backup critical section\n", devname);
3466 goto release;
3467 }
3468 } else {
3469 if (!reshape_open_backup_file(backup_file, fd, devname,
3470 (signed)blocks,
3471 fdlist+d, offsets+d,
3472 sra->sys_name, restart)) {
3473 goto release;
3474 }
3475 d++;
3476 }
3477 }
3478
3479 update_cache_size(container, sra, info,
3480 min(reshape.before.data_disks,
3481 reshape.after.data_disks), blocks);
3482
3483 /* Right, everything seems fine. Let's kick things off.
3484 * If only changing raid_disks, use ioctl, else use
3485 * sysfs.
3486 */
3487 sync_metadata(st);
3488
3489 if (impose_reshape(sra, info, st, fd, restart,
3490 devname, container, &reshape) < 0)
3491 goto release;
3492
3493 err = start_reshape(sra, restart, reshape.before.data_disks,
3494 reshape.after.data_disks);
3495 if (err) {
3496 pr_err("Cannot %s reshape for %s\n",
3497 restart ? "continue" : "start", devname);
3498 goto release;
3499 }
3500 if (restart)
3501 sysfs_set_str(sra, NULL, "array_state", "active");
3502 if (freeze_reshape) {
3503 free(fdlist);
3504 free(offsets);
3505 sysfs_free(sra);
3506 pr_err("Reshape has to be continued from location %llu when root filesystem has been mounted.\n",
3507 sra->reshape_progress);
3508 return 1;
3509 }
3510
3511 if (!forked && !check_env("MDADM_NO_SYSTEMCTL"))
3512 if (continue_via_systemd(container ?: sra->sys_name)) {
3513 free(fdlist);
3514 free(offsets);
3515 sysfs_free(sra);
3516 return 0;
3517 }
3518
3519 /* Now we just need to kick off the reshape and watch, while
3520 * handling backups of the data...
3521 * This is all done by a forked background process.
3522 */
3523 switch(forked ? 0 : fork()) {
3524 case -1:
3525 pr_err("Cannot run child to monitor reshape: %s\n",
3526 strerror(errno));
3527 abort_reshape(sra);
3528 goto release;
3529 default:
3530 free(fdlist);
3531 free(offsets);
3532 sysfs_free(sra);
3533 return 0;
3534 case 0:
3535 map_fork();
3536 break;
3537 }
3538
3539 /* If another array on the same devices is busy, the
3540 * reshape will wait for them. This would mean that
3541 * the first section that we suspend will stay suspended
3542 * for a long time. So check on that possibility
3543 * by looking for "DELAYED" in /proc/mdstat, and if found,
3544 * wait a while
3545 */
3546 do {
3547 struct mdstat_ent *mds, *m;
3548 delayed = 0;
3549 mds = mdstat_read(1, 0);
3550 for (m = mds; m; m = m->next)
3551 if (strcmp(m->devnm, sra->sys_name) == 0) {
3552 if (m->resync && m->percent == RESYNC_DELAYED)
3553 delayed = 1;
3554 if (m->resync == 0)
3555 /* Haven't started the reshape thread
3556 * yet, wait a bit
3557 */
3558 delayed = 2;
3559 break;
3560 }
3561 free_mdstat(mds);
3562 if (delayed == 1 && get_linux_version() < 3007000) {
3563 pr_err("Reshape is delayed, but cannot wait carefully with this kernel.\n"
3564 " You might experience problems until other reshapes complete.\n");
3565 delayed = 0;
3566 }
3567 if (delayed)
3568 mdstat_wait(30 - (delayed-1) * 25);
3569 } while (delayed);
3570 mdstat_close();
3571 close(fd);
3572 if (check_env("MDADM_GROW_VERIFY"))
3573 fd = open(devname, O_RDONLY | O_DIRECT);
3574 else
3575 fd = -1;
3576 mlockall(MCL_FUTURE);
3577
3578 signal(SIGTERM, catch_term);
3579
3580 if (st->ss->external) {
3581 /* metadata handler takes it from here */
3582 done = st->ss->manage_reshape(
3583 fd, sra, &reshape, st, blocks,
3584 fdlist, offsets, d - odisks, fdlist + odisks,
3585 offsets + odisks);
3586 } else
3587 done = child_monitor(
3588 fd, sra, &reshape, st, blocks, fdlist, offsets,
3589 d - odisks, fdlist + odisks, offsets + odisks);
3590
3591 free(fdlist);
3592 free(offsets);
3593
3594 if (backup_file && done) {
3595 char *bul;
3596 bul = make_backup(sra->sys_name);
3597 if (bul) {
3598 char buf[1024];
3599 int l = readlink(bul, buf, sizeof(buf) - 1);
3600 if (l > 0) {
3601 buf[l]=0;
3602 unlink(buf);
3603 }
3604 unlink(bul);
3605 free(bul);
3606 }
3607 unlink(backup_file);
3608 }
3609 if (!done) {
3610 abort_reshape(sra);
3611 goto out;
3612 }
3613
3614 if (!st->ss->external &&
3615 !(reshape.before.data_disks != reshape.after.data_disks &&
3616 info->custom_array_size) && info->new_level == reshape.level &&
3617 !forked) {
3618 /* no need to wait for the reshape to finish as
3619 * there is nothing more to do.
3620 */
3621 sysfs_free(sra);
3622 exit(0);
3623 }
3624 wait_reshape(sra);
3625
3626 if (st->ss->external) {
3627 /* Re-load the metadata as much could have changed */
3628 int cfd = open_dev(st->container_devnm);
3629 if (cfd >= 0) {
3630 flush_mdmon(container);
3631 st->ss->free_super(st);
3632 st->ss->load_container(st, cfd, container);
3633 close(cfd);
3634 }
3635 }
3636
3637 /* set new array size if required customer_array_size is used
3638 * by this metadata.
3639 */
3640 if (reshape.before.data_disks != reshape.after.data_disks &&
3641 info->custom_array_size)
3642 set_array_size(st, info, info->text_version);
3643
3644 if (info->new_level != reshape.level) {
3645 if (fd < 0)
3646 fd = open(devname, O_RDONLY);
3647 impose_level(fd, info->new_level, devname, verbose);
3648 close(fd);
3649 if (info->new_level == 0)
3650 st->update_tail = NULL;
3651 }
3652 out:
3653 sysfs_free(sra);
3654 if (forked)
3655 return 0;
3656 unfreeze(st);
3657 exit(0);
3658
3659 release:
3660 free(fdlist);
3661 free(offsets);
3662 if (orig_level != UnSet && sra) {
3663 c = map_num(pers, orig_level);
3664 if (c && sysfs_set_str(sra, NULL, "level", c) == 0)
3665 pr_err("aborting level change\n");
3666 }
3667 sysfs_free(sra);
3668 if (!forked)
3669 unfreeze(st);
3670 return 1;
3671 }
3672
3673 /* mdfd handle is passed to be closed in child process (after fork).
3674 */
3675 int reshape_container(char *container, char *devname,
3676 int mdfd,
3677 struct supertype *st,
3678 struct mdinfo *info,
3679 int force,
3680 char *backup_file, int verbose,
3681 int forked, int restart, int freeze_reshape)
3682 {
3683 struct mdinfo *cc = NULL;
3684 int rv = restart;
3685 char last_devnm[32] = "";
3686
3687 /* component_size is not meaningful for a container,
3688 * so pass '0' meaning 'no change'
3689 */
3690 if (!restart &&
3691 reshape_super(st, 0, info->new_level,
3692 info->new_layout, info->new_chunk,
3693 info->array.raid_disks, info->delta_disks,
3694 backup_file, devname, APPLY_METADATA_CHANGES,
3695 verbose)) {
3696 unfreeze(st);
3697 return 1;
3698 }
3699
3700 sync_metadata(st);
3701
3702 /* ping monitor to be sure that update is on disk
3703 */
3704 ping_monitor(container);
3705
3706 if (!forked && !freeze_reshape && !check_env("MDADM_NO_SYSTEMCTL"))
3707 if (continue_via_systemd(container))
3708 return 0;
3709
3710 switch (forked ? 0 : fork()) {
3711 case -1: /* error */
3712 perror("Cannot fork to complete reshape\n");
3713 unfreeze(st);
3714 return 1;
3715 default: /* parent */
3716 if (!freeze_reshape)
3717 printf("%s: multi-array reshape continues in background\n", Name);
3718 return 0;
3719 case 0: /* child */
3720 map_fork();
3721 break;
3722 }
3723
3724 /* close unused handle in child process
3725 */
3726 if (mdfd > -1)
3727 close(mdfd);
3728
3729 while(1) {
3730 /* For each member array with reshape_active,
3731 * we need to perform the reshape.
3732 * We pick the first array that needs reshaping and
3733 * reshape it. reshape_array() will re-read the metadata
3734 * so the next time through a different array should be
3735 * ready for reshape.
3736 * It is possible that the 'different' array will not
3737 * be assembled yet. In that case we simple exit.
3738 * When it is assembled, the mdadm which assembles it
3739 * will take over the reshape.
3740 */
3741 struct mdinfo *content;
3742 int fd;
3743 struct mdstat_ent *mdstat;
3744 char *adev;
3745 dev_t devid;
3746
3747 sysfs_free(cc);
3748
3749 cc = st->ss->container_content(st, NULL);
3750
3751 for (content = cc; content ; content = content->next) {
3752 char *subarray;
3753 if (!content->reshape_active)
3754 continue;
3755
3756 subarray = strchr(content->text_version+1, '/')+1;
3757 mdstat = mdstat_by_subdev(subarray, container);
3758 if (!mdstat)
3759 continue;
3760 if (mdstat->active == 0) {
3761 pr_err("Skipping inactive array %s.\n",
3762 mdstat->devnm);
3763 free_mdstat(mdstat);
3764 mdstat = NULL;
3765 continue;
3766 }
3767 break;
3768 }
3769 if (!content)
3770 break;
3771
3772 devid = devnm2devid(mdstat->devnm);
3773 adev = map_dev(major(devid), minor(devid), 0);
3774 if (!adev)
3775 adev = content->text_version;
3776
3777 fd = open_dev(mdstat->devnm);
3778 if (fd < 0) {
3779 pr_err("Device %s cannot be opened for reshape.\n",
3780 adev);
3781 break;
3782 }
3783
3784 if (strcmp(last_devnm, mdstat->devnm) == 0) {
3785 /* Do not allow for multiple reshape_array() calls for
3786 * the same array.
3787 * It can happen when reshape_array() returns without
3788 * error, when reshape is not finished (wrong reshape
3789 * starting/continuation conditions). Mdmon doesn't
3790 * switch to next array in container and reentry
3791 * conditions for the same array occur.
3792 * This is possibly interim until the behaviour of
3793 * reshape_array is resolved().
3794 */
3795 printf("%s: Multiple reshape execution detected for device %s.\n", Name, adev);
3796 close(fd);
3797 break;
3798 }
3799 strcpy(last_devnm, mdstat->devnm);
3800
3801 if (sysfs_init(content, fd, mdstat->devnm)) {
3802 pr_err("Unable to initialize sysfs for %s\n",
3803 mdstat->devnm);
3804 rv = 1;
3805 break;
3806 }
3807
3808 if (mdmon_running(container))
3809 flush_mdmon(container);
3810
3811 rv = reshape_array(container, fd, adev, st,
3812 content, force, NULL, INVALID_SECTORS,
3813 backup_file, verbose, 1, restart,
3814 freeze_reshape);
3815 close(fd);
3816
3817 if (freeze_reshape) {
3818 sysfs_free(cc);
3819 exit(0);
3820 }
3821
3822 restart = 0;
3823 if (rv)
3824 break;
3825
3826 if (mdmon_running(container))
3827 flush_mdmon(container);
3828 }
3829 if (!rv)
3830 unfreeze(st);
3831 sysfs_free(cc);
3832 exit(0);
3833 }
3834
3835 /*
3836 * We run a child process in the background which performs the following
3837 * steps:
3838 * - wait for resync to reach a certain point
3839 * - suspend io to the following section
3840 * - backup that section
3841 * - allow resync to proceed further
3842 * - resume io
3843 * - discard the backup.
3844 *
3845 * When are combined in slightly different ways in the three cases.
3846 * Grow:
3847 * - suspend/backup/allow/wait/resume/discard
3848 * Shrink:
3849 * - allow/wait/suspend/backup/allow/wait/resume/discard
3850 * same-size:
3851 * - wait/resume/discard/suspend/backup/allow
3852 *
3853 * suspend/backup/allow always come together
3854 * wait/resume/discard do too.
3855 * For the same-size case we have two backups to improve flow.
3856 *
3857 */
3858
3859 int progress_reshape(struct mdinfo *info, struct reshape *reshape,
3860 unsigned long long backup_point,
3861 unsigned long long wait_point,
3862 unsigned long long *suspend_point,
3863 unsigned long long *reshape_completed, int *frozen)
3864 {
3865 /* This function is called repeatedly by the reshape manager.
3866 * It determines how much progress can safely be made and allows
3867 * that progress.
3868 * - 'info' identifies the array and particularly records in
3869 * ->reshape_progress the metadata's knowledge of progress
3870 * This is a sector offset from the start of the array
3871 * of the next array block to be relocated. This number
3872 * may increase from 0 or decrease from array_size, depending
3873 * on the type of reshape that is happening.
3874 * Note that in contrast, 'sync_completed' is a block count of the
3875 * reshape so far. It gives the distance between the start point
3876 * (head or tail of device) and the next place that data will be
3877 * written. It always increases.
3878 * - 'reshape' is the structure created by analyse_change
3879 * - 'backup_point' shows how much the metadata manager has backed-up
3880 * data. For reshapes with increasing progress, it is the next address
3881 * to be backed up, previous addresses have been backed-up. For
3882 * decreasing progress, it is the earliest address that has been
3883 * backed up - later address are also backed up.
3884 * So addresses between reshape_progress and backup_point are
3885 * backed up providing those are in the 'correct' order.
3886 * - 'wait_point' is an array address. When reshape_completed
3887 * passes this point, progress_reshape should return. It might
3888 * return earlier if it determines that ->reshape_progress needs
3889 * to be updated or further backup is needed.
3890 * - suspend_point is maintained by progress_reshape and the caller
3891 * should not touch it except to initialise to zero.
3892 * It is an array address and it only increases in 2.6.37 and earlier.
3893 * This makes it difficult to handle reducing reshapes with
3894 * external metadata.
3895 * However: it is similar to backup_point in that it records the
3896 * other end of a suspended region from reshape_progress.
3897 * it is moved to extend the region that is safe to backup and/or
3898 * reshape
3899 * - reshape_completed is read from sysfs and returned. The caller
3900 * should copy this into ->reshape_progress when it has reason to
3901 * believe that the metadata knows this, and any backup outside this
3902 * has been erased.
3903 *
3904 * Return value is:
3905 * 1 if more data from backup_point - but only as far as suspend_point,
3906 * should be backed up
3907 * 0 if things are progressing smoothly
3908 * -1 if the reshape is finished because it is all done,
3909 * -2 if the reshape is finished due to an error.
3910 */
3911
3912 int advancing = (reshape->after.data_disks
3913 >= reshape->before.data_disks);
3914 unsigned long long need_backup; /* All data between start of array and
3915 * here will at some point need to
3916 * be backed up.
3917 */
3918 unsigned long long read_offset, write_offset;
3919 unsigned long long write_range;
3920 unsigned long long max_progress, target, completed;
3921 unsigned long long array_size = (info->component_size
3922 * reshape->before.data_disks);
3923 int fd;
3924 char buf[20];
3925
3926 /* First, we unsuspend any region that is now known to be safe.
3927 * If suspend_point is on the 'wrong' side of reshape_progress, then
3928 * we don't have or need suspension at the moment. This is true for
3929 * native metadata when we don't need to back-up.
3930 */
3931 if (advancing) {
3932 if (info->reshape_progress <= *suspend_point)
3933 sysfs_set_num(info, NULL, "suspend_lo",
3934 info->reshape_progress);
3935 } else {
3936 /* Note: this won't work in 2.6.37 and before.
3937 * Something somewhere should make sure we don't need it!
3938 */
3939 if (info->reshape_progress >= *suspend_point)
3940 sysfs_set_num(info, NULL, "suspend_hi",
3941 info->reshape_progress);
3942 }
3943
3944 /* Now work out how far it is safe to progress.
3945 * If the read_offset for ->reshape_progress is less than
3946 * 'blocks' beyond the write_offset, we can only progress as far
3947 * as a backup.
3948 * Otherwise we can progress until the write_offset for the new location
3949 * reaches (within 'blocks' of) the read_offset at the current location.
3950 * However that region must be suspended unless we are using native
3951 * metadata.
3952 * If we need to suspend more, we limit it to 128M per device, which is
3953 * rather arbitrary and should be some time-based calculation.
3954 */
3955 read_offset = info->reshape_progress / reshape->before.data_disks;
3956 write_offset = info->reshape_progress / reshape->after.data_disks;
3957 write_range = info->new_chunk/512;
3958 if (reshape->before.data_disks == reshape->after.data_disks)
3959 need_backup = array_size;
3960 else
3961 need_backup = reshape->backup_blocks;
3962 if (advancing) {
3963 if (read_offset < write_offset + write_range)
3964 max_progress = backup_point;
3965 else
3966 max_progress =
3967 read_offset * reshape->after.data_disks;
3968 } else {
3969 if (read_offset > write_offset - write_range)
3970 /* Can only progress as far as has been backed up,
3971 * which must be suspended */
3972 max_progress = backup_point;
3973 else if (info->reshape_progress <= need_backup)
3974 max_progress = backup_point;
3975 else {
3976 if (info->array.major_version >= 0)
3977 /* Can progress until backup is needed */
3978 max_progress = need_backup;
3979 else {
3980 /* Can progress until metadata update is required */
3981 max_progress =
3982 read_offset * reshape->after.data_disks;
3983 /* but data must be suspended */
3984 if (max_progress < *suspend_point)
3985 max_progress = *suspend_point;
3986 }
3987 }
3988 }
3989
3990 /* We know it is safe to progress to 'max_progress' providing
3991 * it is suspended or we are using native metadata.
3992 * Consider extending suspend_point 128M per device if it
3993 * is less than 64M per device beyond reshape_progress.
3994 * But always do a multiple of 'blocks'
3995 * FIXME this is too big - it takes to long to complete
3996 * this much.
3997 */
3998 target = 64*1024*2 * min(reshape->before.data_disks,
3999 reshape->after.data_disks);
4000 target /= reshape->backup_blocks;
4001 if (target < 2)
4002 target = 2;
4003 target *= reshape->backup_blocks;
4004
4005 /* For externally managed metadata we always need to suspend IO to
4006 * the area being reshaped so we regularly push suspend_point forward.
4007 * For native metadata we only need the suspend if we are going to do
4008 * a backup.
4009 */
4010 if (advancing) {
4011 if ((need_backup > info->reshape_progress ||
4012 info->array.major_version < 0) &&
4013 *suspend_point < info->reshape_progress + target) {
4014 if (need_backup < *suspend_point + 2 * target)
4015 *suspend_point = need_backup;
4016 else if (*suspend_point + 2 * target < array_size)
4017 *suspend_point += 2 * target;
4018 else
4019 *suspend_point = array_size;
4020 sysfs_set_num(info, NULL, "suspend_hi", *suspend_point);
4021 if (max_progress > *suspend_point)
4022 max_progress = *suspend_point;
4023 }
4024 } else {
4025 if (info->array.major_version >= 0) {
4026 /* Only need to suspend when about to backup */
4027 if (info->reshape_progress < need_backup * 2 &&
4028 *suspend_point > 0) {
4029 *suspend_point = 0;
4030 sysfs_set_num(info, NULL, "suspend_lo", 0);
4031 sysfs_set_num(info, NULL, "suspend_hi",
4032 need_backup);
4033 }
4034 } else {
4035 /* Need to suspend continually */
4036 if (info->reshape_progress < *suspend_point)
4037 *suspend_point = info->reshape_progress;
4038 if (*suspend_point + target < info->reshape_progress)
4039 /* No need to move suspend region yet */;
4040 else {
4041 if (*suspend_point >= 2 * target)
4042 *suspend_point -= 2 * target;
4043 else
4044 *suspend_point = 0;
4045 sysfs_set_num(info, NULL, "suspend_lo",
4046 *suspend_point);
4047 }
4048 if (max_progress < *suspend_point)
4049 max_progress = *suspend_point;
4050 }
4051 }
4052
4053 /* now set sync_max to allow that progress. sync_max, like
4054 * sync_completed is a count of sectors written per device, so
4055 * we find the difference between max_progress and the start point,
4056 * and divide that by after.data_disks to get a sync_max
4057 * number.
4058 * At the same time we convert wait_point to a similar number
4059 * for comparing against sync_completed.
4060 */
4061 /* scale down max_progress to per_disk */
4062 max_progress /= reshape->after.data_disks;
4063 /*
4064 * Round to chunk size as some kernels give an erroneously
4065 * high number
4066 */
4067 max_progress /= info->new_chunk/512;
4068 max_progress *= info->new_chunk/512;
4069 /* And round to old chunk size as the kernel wants that */
4070 max_progress /= info->array.chunk_size/512;
4071 max_progress *= info->array.chunk_size/512;
4072 /* Limit progress to the whole device */
4073 if (max_progress > info->component_size)
4074 max_progress = info->component_size;
4075 wait_point /= reshape->after.data_disks;
4076 if (!advancing) {
4077 /* switch from 'device offset' to 'processed block count' */
4078 max_progress = info->component_size - max_progress;
4079 wait_point = info->component_size - wait_point;
4080 }
4081
4082 if (!*frozen)
4083 sysfs_set_num(info, NULL, "sync_max", max_progress);
4084
4085 /* Now wait. If we have already reached the point that we were
4086 * asked to wait to, don't wait at all, else wait for any change.
4087 * We need to select on 'sync_completed' as that is the place that
4088 * notifications happen, but we are really interested in
4089 * 'reshape_position'
4090 */
4091 fd = sysfs_get_fd(info, NULL, "sync_completed");
4092 if (fd < 0)
4093 goto check_progress;
4094
4095 if (sysfs_fd_get_ll(fd, &completed) < 0)
4096 goto check_progress;
4097
4098 while (completed < max_progress && completed < wait_point) {
4099 /* Check that sync_action is still 'reshape' to avoid
4100 * waiting forever on a dead array
4101 */
4102 char action[20];
4103 if (sysfs_get_str(info, NULL, "sync_action", action, 20) <= 0 ||
4104 strncmp(action, "reshape", 7) != 0)
4105 break;
4106 /* Some kernels reset 'sync_completed' to zero
4107 * before setting 'sync_action' to 'idle'.
4108 * So we need these extra tests.
4109 */
4110 if (completed == 0 && advancing &&
4111 strncmp(action, "idle", 4) == 0 &&
4112 info->reshape_progress > 0)
4113 break;
4114 if (completed == 0 && !advancing &&
4115 strncmp(action, "idle", 4) == 0 &&
4116 info->reshape_progress <
4117 (info->component_size * reshape->after.data_disks))
4118 break;
4119 sysfs_wait(fd, NULL);
4120 if (sysfs_fd_get_ll(fd, &completed) < 0)
4121 goto check_progress;
4122 }
4123 /* Some kernels reset 'sync_completed' to zero,
4124 * we need to have real point we are in md.
4125 * So in that case, read 'reshape_position' from sysfs.
4126 */
4127 if (completed == 0) {
4128 unsigned long long reshapep;
4129 char action[20];
4130 if (sysfs_get_str(info, NULL, "sync_action", action, 20) > 0 &&
4131 strncmp(action, "idle", 4) == 0 &&
4132 sysfs_get_ll(info, NULL,
4133 "reshape_position", &reshapep) == 0)
4134 *reshape_completed = reshapep;
4135 } else {
4136 /* some kernels can give an incorrectly high
4137 * 'completed' number, so round down */
4138 completed /= (info->new_chunk/512);
4139 completed *= (info->new_chunk/512);
4140 /* Convert 'completed' back in to a 'progress' number */
4141 completed *= reshape->after.data_disks;
4142 if (!advancing)
4143 completed = (info->component_size
4144 * reshape->after.data_disks
4145 - completed);
4146 *reshape_completed = completed;
4147 }
4148
4149 close(fd);
4150
4151 /* We return the need_backup flag. Caller will decide
4152 * how much - a multiple of ->backup_blocks up to *suspend_point
4153 */
4154 if (advancing)
4155 return need_backup > info->reshape_progress;
4156 else
4157 return need_backup >= info->reshape_progress;
4158
4159 check_progress:
4160 /* if we couldn't read a number from sync_completed, then
4161 * either the reshape did complete, or it aborted.
4162 * We can tell which by checking for 'none' in reshape_position.
4163 * If it did abort, then it might immediately restart if it
4164 * it was just a device failure that leaves us degraded but
4165 * functioning.
4166 */
4167 if (sysfs_get_str(info, NULL, "reshape_position", buf,
4168 sizeof(buf)) < 0 || strncmp(buf, "none", 4) != 0) {
4169 /* The abort might only be temporary. Wait up to 10
4170 * seconds for fd to contain a valid number again.
4171 */
4172 int wait = 10000;
4173 int rv = -2;
4174 unsigned long long new_sync_max;
4175 while (fd >= 0 && rv < 0 && wait > 0) {
4176 if (sysfs_wait(fd, &wait) != 1)
4177 break;
4178 switch (sysfs_fd_get_ll(fd, &completed)) {
4179 case 0:
4180 /* all good again */
4181 rv = 1;
4182 /* If "sync_max" is no longer max_progress
4183 * we need to freeze things
4184 */
4185 sysfs_get_ll(info, NULL, "sync_max",
4186 &new_sync_max);
4187 *frozen = (new_sync_max != max_progress);
4188 break;
4189 case -2: /* read error - abort */
4190 wait = 0;
4191 break;
4192 }
4193 }
4194 if (fd >= 0)
4195 close(fd);
4196 return rv; /* abort */
4197 } else {
4198 /* Maybe racing with array shutdown - check state */
4199 if (fd >= 0)
4200 close(fd);
4201 if (sysfs_get_str(info, NULL, "array_state", buf,
4202 sizeof(buf)) < 0 ||
4203 strncmp(buf, "inactive", 8) == 0 ||
4204 strncmp(buf, "clear",5) == 0)
4205 return -2; /* abort */
4206 return -1; /* complete */
4207 }
4208 }
4209
4210 /* FIXME return status is never checked */
4211 static int grow_backup(struct mdinfo *sra,
4212 unsigned long long offset, /* per device */
4213 unsigned long stripes, /* per device, in old chunks */
4214 int *sources, unsigned long long *offsets,
4215 int disks, int chunk, int level, int layout,
4216 int dests, int *destfd, unsigned long long *destoffsets,
4217 int part, int *degraded,
4218 char *buf)
4219 {
4220 /* Backup 'blocks' sectors at 'offset' on each device of the array,
4221 * to storage 'destfd' (offset 'destoffsets'), after first
4222 * suspending IO. Then allow resync to continue
4223 * over the suspended section.
4224 * Use part 'part' of the backup-super-block.
4225 */
4226 int odata = disks;
4227 int rv = 0;
4228 int i;
4229 unsigned long long ll;
4230 int new_degraded;
4231 //printf("offset %llu\n", offset);
4232 if (level >= 4)
4233 odata--;
4234 if (level == 6)
4235 odata--;
4236
4237 /* Check that array hasn't become degraded, else we might backup the wrong data */
4238 if (sysfs_get_ll(sra, NULL, "degraded", &ll) < 0)
4239 return -1; /* FIXME this error is ignored */
4240 new_degraded = (int)ll;
4241 if (new_degraded != *degraded) {
4242 /* check each device to ensure it is still working */
4243 struct mdinfo *sd;
4244 for (sd = sra->devs ; sd ; sd = sd->next) {
4245 if (sd->disk.state & (1<<MD_DISK_FAULTY))
4246 continue;
4247 if (sd->disk.state & (1<<MD_DISK_SYNC)) {
4248 char sbuf[100];
4249
4250 if (sysfs_get_str(sra, sd, "state",
4251 sbuf, sizeof(sbuf)) < 0 ||
4252 strstr(sbuf, "faulty") ||
4253 strstr(sbuf, "in_sync") == NULL) {
4254 /* this device is dead */
4255 sd->disk.state = (1<<MD_DISK_FAULTY);
4256 if (sd->disk.raid_disk >= 0 &&
4257 sources[sd->disk.raid_disk] >= 0) {
4258 close(sources[sd->disk.raid_disk]);
4259 sources[sd->disk.raid_disk] = -1;
4260 }
4261 }
4262 }
4263 }
4264 *degraded = new_degraded;
4265 }
4266 if (part) {
4267 bsb.arraystart2 = __cpu_to_le64(offset * odata);
4268 bsb.length2 = __cpu_to_le64(stripes * (chunk/512) * odata);
4269 } else {
4270 bsb.arraystart = __cpu_to_le64(offset * odata);
4271 bsb.length = __cpu_to_le64(stripes * (chunk/512) * odata);
4272 }
4273 if (part)
4274 bsb.magic[15] = '2';
4275 for (i = 0; i < dests; i++)
4276 if (part)
4277 lseek64(destfd[i], destoffsets[i] +
4278 __le64_to_cpu(bsb.devstart2)*512, 0);
4279 else
4280 lseek64(destfd[i], destoffsets[i], 0);
4281
4282 rv = save_stripes(sources, offsets, disks, chunk, level, layout,
4283 dests, destfd, offset * 512 * odata,
4284 stripes * chunk * odata, buf);
4285
4286 if (rv)
4287 return rv;
4288 bsb.mtime = __cpu_to_le64(time(0));
4289 for (i = 0; i < dests; i++) {
4290 bsb.devstart = __cpu_to_le64(destoffsets[i]/512);
4291
4292 bsb.sb_csum = bsb_csum((char*)&bsb,
4293 ((char*)&bsb.sb_csum)-((char*)&bsb));
4294 if (memcmp(bsb.magic, "md_backup_data-2", 16) == 0)
4295 bsb.sb_csum2 = bsb_csum((char*)&bsb,
4296 ((char*)&bsb.sb_csum2)-((char*)&bsb));
4297
4298 rv = -1;
4299 if ((unsigned long long)lseek64(destfd[i],
4300 destoffsets[i] - 4096, 0) !=
4301 destoffsets[i] - 4096)
4302 break;
4303 if (write(destfd[i], &bsb, 512) != 512)
4304 break;
4305 if (destoffsets[i] > 4096) {
4306 if ((unsigned long long)lseek64(destfd[i], destoffsets[i]+stripes*chunk*odata, 0) !=
4307 destoffsets[i]+stripes*chunk*odata)
4308 break;
4309 if (write(destfd[i], &bsb, 512) != 512)
4310 break;
4311 }
4312 fsync(destfd[i]);
4313 rv = 0;
4314 }
4315
4316 return rv;
4317 }
4318
4319 /* in 2.6.30, the value reported by sync_completed can be
4320 * less that it should be by one stripe.
4321 * This only happens when reshape hits sync_max and pauses.
4322 * So allow wait_backup to either extent sync_max further
4323 * than strictly necessary, or return before the
4324 * sync has got quite as far as we would really like.
4325 * This is what 'blocks2' is for.
4326 * The various caller give appropriate values so that
4327 * every works.
4328 */
4329 /* FIXME return value is often ignored */
4330 static int forget_backup(int dests, int *destfd,
4331 unsigned long long *destoffsets,
4332 int part)
4333 {
4334 /*
4335 * Erase backup 'part' (which is 0 or 1)
4336 */
4337 int i;
4338 int rv;
4339
4340 if (part) {
4341 bsb.arraystart2 = __cpu_to_le64(0);
4342 bsb.length2 = __cpu_to_le64(0);
4343 } else {
4344 bsb.arraystart = __cpu_to_le64(0);
4345 bsb.length = __cpu_to_le64(0);
4346 }
4347 bsb.mtime = __cpu_to_le64(time(0));
4348 rv = 0;
4349 for (i = 0; i < dests; i++) {
4350 bsb.devstart = __cpu_to_le64(destoffsets[i]/512);
4351 bsb.sb_csum = bsb_csum((char*)&bsb,
4352 ((char*)&bsb.sb_csum)-((char*)&bsb));
4353 if (memcmp(bsb.magic, "md_backup_data-2", 16) == 0)
4354 bsb.sb_csum2 = bsb_csum((char*)&bsb,
4355 ((char*)&bsb.sb_csum2)-((char*)&bsb));
4356 if ((unsigned long long)lseek64(destfd[i], destoffsets[i]-4096, 0) !=
4357 destoffsets[i]-4096)
4358 rv = -1;
4359 if (rv == 0 && write(destfd[i], &bsb, 512) != 512)
4360 rv = -1;
4361 fsync(destfd[i]);
4362 }
4363 return rv;
4364 }
4365
4366 static void fail(char *msg)
4367 {
4368 int rv;
4369 rv = (write(2, msg, strlen(msg)) != (int)strlen(msg));
4370 rv |= (write(2, "\n", 1) != 1);
4371 exit(rv ? 1 : 2);
4372 }
4373
4374 static char *abuf, *bbuf;
4375 static unsigned long long abuflen;
4376 static void validate(int afd, int bfd, unsigned long long offset)
4377 {
4378 /* check that the data in the backup against the array.
4379 * This is only used for regression testing and should not
4380 * be used while the array is active
4381 */
4382 if (afd < 0)
4383 return;
4384 lseek64(bfd, offset - 4096, 0);
4385 if (read(bfd, &bsb2, 512) != 512)
4386 fail("cannot read bsb");
4387 if (bsb2.sb_csum != bsb_csum((char*)&bsb2,
4388 ((char*)&bsb2.sb_csum)-((char*)&bsb2)))
4389 fail("first csum bad");
4390 if (memcmp(bsb2.magic, "md_backup_data", 14) != 0)
4391 fail("magic is bad");
4392 if (memcmp(bsb2.magic, "md_backup_data-2", 16) == 0 &&
4393 bsb2.sb_csum2 != bsb_csum((char*)&bsb2,
4394 ((char*)&bsb2.sb_csum2)-((char*)&bsb2)))
4395 fail("second csum bad");
4396
4397 if (__le64_to_cpu(bsb2.devstart)*512 != offset)
4398 fail("devstart is wrong");
4399
4400 if (bsb2.length) {
4401 unsigned long long len = __le64_to_cpu(bsb2.length)*512;
4402
4403 if (abuflen < len) {
4404 free(abuf);
4405 free(bbuf);
4406 abuflen = len;
4407 if (posix_memalign((void**)&abuf, 4096, abuflen) ||
4408 posix_memalign((void**)&bbuf, 4096, abuflen)) {
4409 abuflen = 0;
4410 /* just stop validating on mem-alloc failure */
4411 return;
4412 }
4413 }
4414
4415 lseek64(bfd, offset, 0);
4416 if ((unsigned long long)read(bfd, bbuf, len) != len) {
4417 //printf("len %llu\n", len);
4418 fail("read first backup failed");
4419 }
4420 lseek64(afd, __le64_to_cpu(bsb2.arraystart)*512, 0);
4421 if ((unsigned long long)read(afd, abuf, len) != len)
4422 fail("read first from array failed");
4423 if (memcmp(bbuf, abuf, len) != 0) {
4424 #if 0
4425 int i;
4426 printf("offset=%llu len=%llu\n",
4427 (unsigned long long)__le64_to_cpu(bsb2.arraystart)*512, len);
4428 for (i=0; i<len; i++)
4429 if (bbuf[i] != abuf[i]) {
4430 printf("first diff byte %d\n", i);
4431 break;
4432 }
4433 #endif
4434 fail("data1 compare failed");
4435 }
4436 }
4437 if (bsb2.length2) {
4438 unsigned long long len = __le64_to_cpu(bsb2.length2)*512;
4439
4440 if (abuflen < len) {
4441 free(abuf);
4442 free(bbuf);
4443 abuflen = len;
4444 abuf = xmalloc(abuflen);
4445 bbuf = xmalloc(abuflen);
4446 }
4447
4448 lseek64(bfd, offset+__le64_to_cpu(bsb2.devstart2)*512, 0);
4449 if ((unsigned long long)read(bfd, bbuf, len) != len)
4450 fail("read second backup failed");
4451 lseek64(afd, __le64_to_cpu(bsb2.arraystart2)*512, 0);
4452 if ((unsigned long long)read(afd, abuf, len) != len)
4453 fail("read second from array failed");
4454 if (memcmp(bbuf, abuf, len) != 0)
4455 fail("data2 compare failed");
4456 }
4457 }
4458
4459 int child_monitor(int afd, struct mdinfo *sra, struct reshape *reshape,
4460 struct supertype *st, unsigned long blocks,
4461 int *fds, unsigned long long *offsets,
4462 int dests, int *destfd, unsigned long long *destoffsets)
4463 {
4464 /* Monitor a reshape where backup is being performed using
4465 * 'native' mechanism - either to a backup file, or
4466 * to some space in a spare.
4467 */
4468 char *buf;
4469 int degraded = -1;
4470 unsigned long long speed;
4471 unsigned long long suspend_point, array_size;
4472 unsigned long long backup_point, wait_point;
4473 unsigned long long reshape_completed;
4474 int done = 0;
4475 int increasing = reshape->after.data_disks >=
4476 reshape->before.data_disks;
4477 int part = 0; /* The next part of the backup area to fill. It
4478 * may already be full, so we need to check */
4479 int level = reshape->level;
4480 int layout = reshape->before.layout;
4481 int data = reshape->before.data_disks;
4482 int disks = reshape->before.data_disks + reshape->parity;
4483 int chunk = sra->array.chunk_size;
4484 struct mdinfo *sd;
4485 unsigned long stripes;
4486 int uuid[4];
4487 int frozen = 0;
4488
4489 /* set up the backup-super-block. This requires the
4490 * uuid from the array.
4491 */
4492 /* Find a superblock */
4493 for (sd = sra->devs; sd; sd = sd->next) {
4494 char *dn;
4495 int devfd;
4496 int ok;
4497 if (sd->disk.state & (1<<MD_DISK_FAULTY))
4498 continue;
4499 dn = map_dev(sd->disk.major, sd->disk.minor, 1);
4500 devfd = dev_open(dn, O_RDONLY);
4501 if (devfd < 0)
4502 continue;
4503 ok = st->ss->load_super(st, devfd, NULL);
4504 close(devfd);
4505 if (ok == 0)
4506 break;
4507 }
4508 if (!sd) {
4509 pr_err("Cannot find a superblock\n");
4510 return 0;
4511 }
4512
4513 memset(&bsb, 0, 512);
4514 memcpy(bsb.magic, "md_backup_data-1", 16);
4515 st->ss->uuid_from_super(st, uuid);
4516 memcpy(bsb.set_uuid, uuid, 16);
4517 bsb.mtime = __cpu_to_le64(time(0));
4518 bsb.devstart2 = blocks;
4519
4520 stripes = blocks / (sra->array.chunk_size/512) /
4521 reshape->before.data_disks;
4522
4523 if (posix_memalign((void**)&buf, 4096, disks * chunk))
4524 /* Don't start the 'reshape' */
4525 return 0;
4526 if (reshape->before.data_disks == reshape->after.data_disks) {
4527 sysfs_get_ll(sra, NULL, "sync_speed_min", &speed);
4528 sysfs_set_num(sra, NULL, "sync_speed_min", 200000);
4529 }
4530
4531 if (increasing) {
4532 array_size = sra->component_size * reshape->after.data_disks;
4533 backup_point = sra->reshape_progress;
4534 suspend_point = 0;
4535 } else {
4536 array_size = sra->component_size * reshape->before.data_disks;
4537 backup_point = reshape->backup_blocks;
4538 suspend_point = array_size;
4539 }
4540
4541 while (!done) {
4542 int rv;
4543
4544 /* Want to return as soon the oldest backup slot can
4545 * be released as that allows us to start backing up
4546 * some more, providing suspend_point has been
4547 * advanced, which it should have.
4548 */
4549 if (increasing) {
4550 wait_point = array_size;
4551 if (part == 0 && __le64_to_cpu(bsb.length) > 0)
4552 wait_point = (__le64_to_cpu(bsb.arraystart) +
4553 __le64_to_cpu(bsb.length));
4554 if (part == 1 && __le64_to_cpu(bsb.length2) > 0)
4555 wait_point = (__le64_to_cpu(bsb.arraystart2) +
4556 __le64_to_cpu(bsb.length2));
4557 } else {
4558 wait_point = 0;
4559 if (part == 0 && __le64_to_cpu(bsb.length) > 0)
4560 wait_point = __le64_to_cpu(bsb.arraystart);
4561 if (part == 1 && __le64_to_cpu(bsb.length2) > 0)
4562 wait_point = __le64_to_cpu(bsb.arraystart2);
4563 }
4564
4565 reshape_completed = sra->reshape_progress;
4566 rv = progress_reshape(sra, reshape,
4567 backup_point, wait_point,
4568 &suspend_point, &reshape_completed,
4569 &frozen);
4570 /* external metadata would need to ping_monitor here */
4571 sra->reshape_progress = reshape_completed;
4572
4573 /* Clear any backup region that is before 'here' */
4574 if (increasing) {
4575 if (__le64_to_cpu(bsb.length) > 0 &&
4576 reshape_completed >= (__le64_to_cpu(bsb.arraystart) +
4577 __le64_to_cpu(bsb.length)))
4578 forget_backup(dests, destfd,
4579 destoffsets, 0);
4580 if (__le64_to_cpu(bsb.length2) > 0 &&
4581 reshape_completed >= (__le64_to_cpu(bsb.arraystart2) +
4582 __le64_to_cpu(bsb.length2)))
4583 forget_backup(dests, destfd,
4584 destoffsets, 1);
4585 } else {
4586 if (__le64_to_cpu(bsb.length) > 0 &&
4587 reshape_completed <= (__le64_to_cpu(bsb.arraystart)))
4588 forget_backup(dests, destfd,
4589 destoffsets, 0);
4590 if (__le64_to_cpu(bsb.length2) > 0 &&
4591 reshape_completed <= (__le64_to_cpu(bsb.arraystart2)))
4592 forget_backup(dests, destfd,
4593 destoffsets, 1);
4594 }
4595 if (sigterm)
4596 rv = -2;
4597 if (rv < 0) {
4598 if (rv == -1)
4599 done = 1;
4600 break;
4601 }
4602 if (rv == 0 && increasing && !st->ss->external) {
4603 /* No longer need to monitor this reshape */
4604 sysfs_set_str(sra, NULL, "sync_max", "max");
4605 done = 1;
4606 break;
4607 }
4608
4609 while (rv) {
4610 unsigned long long offset;
4611 unsigned long actual_stripes;
4612 /* Need to backup some data.
4613 * If 'part' is not used and the desired
4614 * backup size is suspended, do a backup,
4615 * then consider the next part.
4616 */
4617 /* Check that 'part' is unused */
4618 if (part == 0 && __le64_to_cpu(bsb.length) != 0)
4619 break;
4620 if (part == 1 && __le64_to_cpu(bsb.length2) != 0)
4621 break;
4622
4623 offset = backup_point / data;
4624 actual_stripes = stripes;
4625 if (increasing) {
4626 if (offset + actual_stripes * (chunk/512) >
4627 sra->component_size)
4628 actual_stripes = ((sra->component_size - offset)
4629 / (chunk/512));
4630 if (offset + actual_stripes * (chunk/512) >
4631 suspend_point/data)
4632 break;
4633 } else {
4634 if (offset < actual_stripes * (chunk/512))
4635 actual_stripes = offset / (chunk/512);
4636 offset -= actual_stripes * (chunk/512);
4637 if (offset < suspend_point/data)
4638 break;
4639 }
4640 if (actual_stripes == 0)
4641 break;
4642 grow_backup(sra, offset, actual_stripes, fds, offsets,
4643 disks, chunk, level, layout, dests, destfd,
4644 destoffsets, part, &degraded, buf);
4645 validate(afd, destfd[0], destoffsets[0]);
4646 /* record where 'part' is up to */
4647 part = !part;
4648 if (increasing)
4649 backup_point += actual_stripes * (chunk/512) * data;
4650 else
4651 backup_point -= actual_stripes * (chunk/512) * data;
4652 }
4653 }
4654
4655 /* FIXME maybe call progress_reshape one more time instead */
4656 /* remove any remaining suspension */
4657 sysfs_set_num(sra, NULL, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL);
4658 sysfs_set_num(sra, NULL, "suspend_hi", 0);
4659 sysfs_set_num(sra, NULL, "suspend_lo", 0);
4660 sysfs_set_num(sra, NULL, "sync_min", 0);
4661
4662 if (reshape->before.data_disks == reshape->after.data_disks)
4663 sysfs_set_num(sra, NULL, "sync_speed_min", speed);
4664 free(buf);
4665 return done;
4666 }
4667
4668 /*
4669 * If any spare contains md_back_data-1 which is recent wrt mtime,
4670 * write that data into the array and update the super blocks with
4671 * the new reshape_progress
4672 */
4673 int Grow_restart(struct supertype *st, struct mdinfo *info, int *fdlist,
4674 int cnt, char *backup_file, int verbose)
4675 {
4676 int i, j;
4677 int old_disks;
4678 unsigned long long *offsets;
4679 unsigned long long nstripe, ostripe;
4680 int ndata, odata;
4681
4682 odata = info->array.raid_disks - info->delta_disks - 1;
4683 if (info->array.level == 6)
4684 odata--; /* number of data disks */
4685 ndata = info->array.raid_disks - 1;
4686 if (info->new_level == 6)
4687 ndata--;
4688
4689 old_disks = info->array.raid_disks - info->delta_disks;
4690
4691 if (info->delta_disks <= 0)
4692 /* Didn't grow, so the backup file must have
4693 * been used
4694 */
4695 old_disks = cnt;
4696 for (i=old_disks-(backup_file?1:0); i<cnt; i++) {
4697 struct mdinfo dinfo;
4698 int fd;
4699 int bsbsize;
4700 char *devname, namebuf[20];
4701 unsigned long long lo, hi;
4702
4703 /* This was a spare and may have some saved data on it.
4704 * Load the superblock, find and load the
4705 * backup_super_block.
4706 * If either fail, go on to next device.
4707 * If the backup contains no new info, just return
4708 * else restore data and update all superblocks
4709 */
4710 if (i == old_disks-1) {
4711 fd = open(backup_file, O_RDONLY);
4712 if (fd<0) {
4713 pr_err("backup file %s inaccessible: %s\n",
4714 backup_file, strerror(errno));
4715 continue;
4716 }
4717 devname = backup_file;
4718 } else {
4719 fd = fdlist[i];
4720 if (fd < 0)
4721 continue;
4722 if (st->ss->load_super(st, fd, NULL))
4723 continue;
4724
4725 st->ss->getinfo_super(st, &dinfo, NULL);
4726 st->ss->free_super(st);
4727
4728 if (lseek64(fd,
4729 (dinfo.data_offset + dinfo.component_size - 8) <<9,
4730 0) < 0) {
4731 pr_err("Cannot seek on device %d\n", i);
4732 continue; /* Cannot seek */
4733 }
4734 sprintf(namebuf, "device-%d", i);
4735 devname = namebuf;
4736 }
4737 if (read(fd, &bsb, sizeof(bsb)) != sizeof(bsb)) {
4738 if (verbose)
4739 pr_err("Cannot read from %s\n", devname);
4740 continue; /* Cannot read */
4741 }
4742 if (memcmp(bsb.magic, "md_backup_data-1", 16) != 0 &&
4743 memcmp(bsb.magic, "md_backup_data-2", 16) != 0) {
4744 if (verbose)
4745 pr_err("No backup metadata on %s\n", devname);
4746 continue;
4747 }
4748 if (bsb.sb_csum != bsb_csum((char*)&bsb, ((char*)&bsb.sb_csum)-((char*)&bsb))) {
4749 if (verbose)
4750 pr_err("Bad backup-metadata checksum on %s\n",
4751 devname);
4752 continue; /* bad checksum */
4753 }
4754 if (memcmp(bsb.magic, "md_backup_data-2", 16) == 0 &&
4755 bsb.sb_csum2 != bsb_csum((char*)&bsb, ((char*)&bsb.sb_csum2)-((char*)&bsb))) {
4756 if (verbose)
4757 pr_err("Bad backup-metadata checksum2 on %s\n",
4758 devname);
4759 continue; /* Bad second checksum */
4760 }
4761 if (memcmp(bsb.set_uuid,info->uuid, 16) != 0) {
4762 if (verbose)
4763 pr_err("Wrong uuid on backup-metadata on %s\n",
4764 devname);
4765 continue; /* Wrong uuid */
4766 }
4767
4768 /*
4769 * array utime and backup-mtime should be updated at
4770 * much the same time, but it seems that sometimes
4771 * they aren't... So allow considerable flexability in
4772 * matching, and allow this test to be overridden by
4773 * an environment variable.
4774 */
4775 if(time_after(info->array.utime, (unsigned int)__le64_to_cpu(bsb.mtime) + 2*60*60) ||
4776 time_before(info->array.utime, (unsigned int)__le64_to_cpu(bsb.mtime) - 10*60)) {
4777 if (check_env("MDADM_GROW_ALLOW_OLD")) {
4778 pr_err("accepting backup with timestamp %lu for array with timestamp %lu\n",
4779 (unsigned long)__le64_to_cpu(bsb.mtime),
4780 (unsigned long)info->array.utime);
4781 } else {
4782 pr_err("too-old timestamp on backup-metadata on %s\n", devname);
4783 pr_err("If you think it is should be safe, try 'export MDADM_GROW_ALLOW_OLD=1'\n");
4784 continue; /* time stamp is too bad */
4785 }
4786 }
4787
4788 if (bsb.magic[15] == '1') {
4789 if (bsb.length == 0)
4790 continue;
4791 if (info->delta_disks >= 0) {
4792 /* reshape_progress is increasing */
4793 if (__le64_to_cpu(bsb.arraystart)
4794 + __le64_to_cpu(bsb.length)
4795 < info->reshape_progress) {
4796 nonew:
4797 if (verbose)
4798 pr_err("backup-metadata found on %s but is not needed\n", devname);
4799 continue; /* No new data here */
4800 }
4801 } else {
4802 /* reshape_progress is decreasing */
4803 if (__le64_to_cpu(bsb.arraystart) >=
4804 info->reshape_progress)
4805 goto nonew; /* No new data here */
4806 }
4807 } else {
4808 if (bsb.length == 0 && bsb.length2 == 0)
4809 continue;
4810 if (info->delta_disks >= 0) {
4811 /* reshape_progress is increasing */
4812 if ((__le64_to_cpu(bsb.arraystart)
4813 + __le64_to_cpu(bsb.length)
4814 < info->reshape_progress) &&
4815 (__le64_to_cpu(bsb.arraystart2)
4816 + __le64_to_cpu(bsb.length2)
4817 < info->reshape_progress))
4818 goto nonew; /* No new data here */
4819 } else {
4820 /* reshape_progress is decreasing */
4821 if (__le64_to_cpu(bsb.arraystart) >=
4822 info->reshape_progress &&
4823 __le64_to_cpu(bsb.arraystart2) >=
4824 info->reshape_progress)
4825 goto nonew; /* No new data here */
4826 }
4827 }
4828 if (lseek64(fd, __le64_to_cpu(bsb.devstart)*512, 0)< 0) {
4829 second_fail:
4830 if (verbose)
4831 pr_err("Failed to verify secondary backup-metadata block on %s\n",
4832 devname);
4833 continue; /* Cannot seek */
4834 }
4835 /* There should be a duplicate backup superblock 4k before here */
4836 if (lseek64(fd, -4096, 1) < 0 ||
4837 read(fd, &bsb2, sizeof(bsb2)) != sizeof(bsb2))
4838 goto second_fail; /* Cannot find leading superblock */
4839 if (bsb.magic[15] == '1')
4840 bsbsize = offsetof(struct mdp_backup_super, pad1);
4841 else
4842 bsbsize = offsetof(struct mdp_backup_super, pad);
4843 if (memcmp(&bsb2, &bsb, bsbsize) != 0)
4844 goto second_fail; /* Cannot find leading superblock */
4845
4846 /* Now need the data offsets for all devices. */
4847 offsets = xmalloc(sizeof(*offsets)*info->array.raid_disks);
4848 for(j=0; j<info->array.raid_disks; j++) {
4849 if (fdlist[j] < 0)
4850 continue;
4851 if (st->ss->load_super(st, fdlist[j], NULL))
4852 /* FIXME should be this be an error */
4853 continue;
4854 st->ss->getinfo_super(st, &dinfo, NULL);
4855 st->ss->free_super(st);
4856 offsets[j] = dinfo.data_offset * 512;
4857 }
4858 printf("%s: restoring critical section\n", Name);
4859
4860 if (restore_stripes(fdlist, offsets, info->array.raid_disks,
4861 info->new_chunk, info->new_level,
4862 info->new_layout, fd,
4863 __le64_to_cpu(bsb.devstart)*512,
4864 __le64_to_cpu(bsb.arraystart)*512,
4865 __le64_to_cpu(bsb.length)*512, NULL)) {
4866 /* didn't succeed, so giveup */
4867 if (verbose)
4868 pr_err("Error restoring backup from %s\n",
4869 devname);
4870 free(offsets);
4871 return 1;
4872 }
4873
4874 if (bsb.magic[15] == '2' &&
4875 restore_stripes(fdlist, offsets, info->array.raid_disks,
4876 info->new_chunk, info->new_level,
4877 info->new_layout, fd,
4878 __le64_to_cpu(bsb.devstart)*512 +
4879 __le64_to_cpu(bsb.devstart2)*512,
4880 __le64_to_cpu(bsb.arraystart2)*512,
4881 __le64_to_cpu(bsb.length2)*512, NULL)) {
4882 /* didn't succeed, so giveup */
4883 if (verbose)
4884 pr_err("Error restoring second backup from %s\n",
4885 devname);
4886 free(offsets);
4887 return 1;
4888 }
4889
4890 free(offsets);
4891
4892 /* Ok, so the data is restored. Let's update those superblocks. */
4893
4894 lo = hi = 0;
4895 if (bsb.length) {
4896 lo = __le64_to_cpu(bsb.arraystart);
4897 hi = lo + __le64_to_cpu(bsb.length);
4898 }
4899 if (bsb.magic[15] == '2' && bsb.length2) {
4900 unsigned long long lo1, hi1;
4901 lo1 = __le64_to_cpu(bsb.arraystart2);
4902 hi1 = lo1 + __le64_to_cpu(bsb.length2);
4903 if (lo == hi) {
4904 lo = lo1;
4905 hi = hi1;
4906 } else if (lo < lo1)
4907 hi = hi1;
4908 else
4909 lo = lo1;
4910 }
4911 if (lo < hi && (info->reshape_progress < lo ||
4912 info->reshape_progress > hi))
4913 /* backup does not affect reshape_progress*/ ;
4914 else if (info->delta_disks >= 0) {
4915 info->reshape_progress = __le64_to_cpu(bsb.arraystart) +
4916 __le64_to_cpu(bsb.length);
4917 if (bsb.magic[15] == '2') {
4918 unsigned long long p2;
4919
4920 p2 = __le64_to_cpu(bsb.arraystart2) +
4921 __le64_to_cpu(bsb.length2);
4922 if (p2 > info->reshape_progress)
4923 info->reshape_progress = p2;
4924 }
4925 } else {
4926 info->reshape_progress = __le64_to_cpu(bsb.arraystart);
4927 if (bsb.magic[15] == '2') {
4928 unsigned long long p2;
4929
4930 p2 = __le64_to_cpu(bsb.arraystart2);
4931 if (p2 < info->reshape_progress)
4932 info->reshape_progress = p2;
4933 }
4934 }
4935 for (j=0; j<info->array.raid_disks; j++) {
4936 if (fdlist[j] < 0)
4937 continue;
4938 if (st->ss->load_super(st, fdlist[j], NULL))
4939 continue;
4940 st->ss->getinfo_super(st, &dinfo, NULL);
4941 dinfo.reshape_progress = info->reshape_progress;
4942 st->ss->update_super(st, &dinfo, "_reshape_progress",
4943 NULL,0, 0, NULL);
4944 st->ss->store_super(st, fdlist[j]);
4945 st->ss->free_super(st);
4946 }
4947 return 0;
4948 }
4949 /* Didn't find any backup data, try to see if any
4950 * was needed.
4951 */
4952 if (info->delta_disks < 0) {
4953 /* When shrinking, the critical section is at the end.
4954 * So see if we are before the critical section.
4955 */
4956 unsigned long long first_block;
4957 nstripe = ostripe = 0;
4958 first_block = 0;
4959 while (ostripe >= nstripe) {
4960 ostripe += info->array.chunk_size / 512;
4961 first_block = ostripe * odata;
4962 nstripe = first_block / ndata / (info->new_chunk/512) *
4963 (info->new_chunk/512);
4964 }
4965
4966 if (info->reshape_progress >= first_block)
4967 return 0;
4968 }
4969 if (info->delta_disks > 0) {
4970 /* See if we are beyond the critical section. */
4971 unsigned long long last_block;
4972 nstripe = ostripe = 0;
4973 last_block = 0;
4974 while (nstripe >= ostripe) {
4975 nstripe += info->new_chunk / 512;
4976 last_block = nstripe * ndata;
4977 ostripe = last_block / odata / (info->array.chunk_size/512) *
4978 (info->array.chunk_size/512);
4979 }
4980
4981 if (info->reshape_progress >= last_block)
4982 return 0;
4983 }
4984 /* needed to recover critical section! */
4985 if (verbose)
4986 pr_err("Failed to find backup of critical section\n");
4987 return 1;
4988 }
4989
4990 int Grow_continue_command(char *devname, int fd,
4991 char *backup_file, int verbose)
4992 {
4993 int ret_val = 0;
4994 struct supertype *st = NULL;
4995 struct mdinfo *content = NULL;
4996 struct mdinfo array;
4997 char *subarray = NULL;
4998 struct mdinfo *cc = NULL;
4999 struct mdstat_ent *mdstat = NULL;
5000 int cfd = -1;
5001 int fd2;
5002
5003 dprintf("Grow continue from command line called for %s\n", devname);
5004
5005 st = super_by_fd(fd, &subarray);
5006 if (!st || !st->ss) {
5007 pr_err("Unable to determine metadata format for %s\n", devname);
5008 return 1;
5009 }
5010 dprintf("Grow continue is run for ");
5011 if (st->ss->external == 0) {
5012 int d;
5013 int cnt = 5;
5014 dprintf_cont("native array (%s)\n", devname);
5015 if (md_get_array_info(fd, &array.array) < 0) {
5016 pr_err("%s is not an active md array - aborting\n",
5017 devname);
5018 ret_val = 1;
5019 goto Grow_continue_command_exit;
5020 }
5021 content = &array;
5022 sysfs_init(content, fd, NULL);
5023 /* Need to load a superblock.
5024 * FIXME we should really get what we need from
5025 * sysfs
5026 */
5027 do {
5028 for (d = 0; d < MAX_DISKS; d++) {
5029 mdu_disk_info_t disk;
5030 char *dv;
5031 int err;
5032 disk.number = d;
5033 if (md_get_disk_info(fd, &disk) < 0)
5034 continue;
5035 if (disk.major == 0 && disk.minor == 0)
5036 continue;
5037 if ((disk.state & (1 << MD_DISK_ACTIVE)) == 0)
5038 continue;
5039 dv = map_dev(disk.major, disk.minor, 1);
5040 if (!dv)
5041 continue;
5042 fd2 = dev_open(dv, O_RDONLY);
5043 if (fd2 < 0)
5044 continue;
5045 err = st->ss->load_super(st, fd2, NULL);
5046 close(fd2);
5047 if (err)
5048 continue;
5049 break;
5050 }
5051 if (d == MAX_DISKS) {
5052 pr_err("Unable to load metadata for %s\n",
5053 devname);
5054 ret_val = 1;
5055 goto Grow_continue_command_exit;
5056 }
5057 st->ss->getinfo_super(st, content, NULL);
5058 if (!content->reshape_active)
5059 sleep(3);
5060 else
5061 break;
5062 } while (cnt-- > 0);
5063 } else {
5064 char *container;
5065
5066 if (subarray) {
5067 dprintf_cont("subarray (%s)\n", subarray);
5068 container = st->container_devnm;
5069 cfd = open_dev_excl(st->container_devnm);
5070 } else {
5071 container = st->devnm;
5072 close(fd);
5073 cfd = open_dev_excl(st->devnm);
5074 dprintf_cont("container (%s)\n", container);
5075 fd = cfd;
5076 }
5077 if (cfd < 0) {
5078 pr_err("Unable to open container for %s\n", devname);
5079 ret_val = 1;
5080 goto Grow_continue_command_exit;
5081 }
5082
5083 /* find in container array under reshape
5084 */
5085 ret_val = st->ss->load_container(st, cfd, NULL);
5086 if (ret_val) {
5087 pr_err("Cannot read superblock for %s\n", devname);
5088 ret_val = 1;
5089 goto Grow_continue_command_exit;
5090 }
5091
5092 cc = st->ss->container_content(st, subarray);
5093 for (content = cc; content ; content = content->next) {
5094 char *array_name;
5095 int allow_reshape = 1;
5096
5097 if (content->reshape_active == 0)
5098 continue;
5099 /* The decision about array or container wide
5100 * reshape is taken in Grow_continue based
5101 * content->reshape_active state, therefore we
5102 * need to check_reshape based on
5103 * reshape_active and subarray name
5104 */
5105 if (content->array.state & (1<<MD_SB_BLOCK_VOLUME))
5106 allow_reshape = 0;
5107 if (content->reshape_active == CONTAINER_RESHAPE &&
5108 (content->array.state
5109 & (1<<MD_SB_BLOCK_CONTAINER_RESHAPE)))
5110 allow_reshape = 0;
5111
5112 if (!allow_reshape) {
5113 pr_err("cannot continue reshape of an array in container with unsupported metadata: %s(%s)\n",
5114 devname, container);
5115 ret_val = 1;
5116 goto Grow_continue_command_exit;
5117 }
5118
5119 array_name = strchr(content->text_version+1, '/')+1;
5120 mdstat = mdstat_by_subdev(array_name, container);
5121 if (!mdstat)
5122 continue;
5123 if (mdstat->active == 0) {
5124 pr_err("Skipping inactive array %s.\n",
5125 mdstat->devnm);
5126 free_mdstat(mdstat);
5127 mdstat = NULL;
5128 continue;
5129 }
5130 break;
5131 }
5132 if (!content) {
5133 pr_err("Unable to determine reshaped array for %s\n", devname);
5134 ret_val = 1;
5135 goto Grow_continue_command_exit;
5136 }
5137 fd2 = open_dev(mdstat->devnm);
5138 if (fd2 < 0) {
5139 pr_err("cannot open (%s)\n", mdstat->devnm);
5140 ret_val = 1;
5141 goto Grow_continue_command_exit;
5142 }
5143
5144 if (sysfs_init(content, fd2, mdstat->devnm)) {
5145 pr_err("Unable to initialize sysfs for %s, Grow cannot continue.\n",
5146 mdstat->devnm);
5147 ret_val = 1;
5148 close(fd2);
5149 goto Grow_continue_command_exit;
5150 }
5151
5152 close(fd2);
5153
5154 /* start mdmon in case it is not running
5155 */
5156 if (!mdmon_running(container))
5157 start_mdmon(container);
5158 ping_monitor(container);
5159
5160 if (mdmon_running(container))
5161 st->update_tail = &st->updates;
5162 else {
5163 pr_err("No mdmon found. Grow cannot continue.\n");
5164 ret_val = 1;
5165 goto Grow_continue_command_exit;
5166 }
5167 }
5168
5169 /* verify that array under reshape is started from
5170 * correct position
5171 */
5172 if (verify_reshape_position(content, content->array.level) < 0) {
5173 ret_val = 1;
5174 goto Grow_continue_command_exit;
5175 }
5176
5177 /* continue reshape
5178 */
5179 ret_val = Grow_continue(fd, st, content, backup_file, 1, 0);
5180
5181 Grow_continue_command_exit:
5182 if (cfd > -1)
5183 close(cfd);
5184 st->ss->free_super(st);
5185 free_mdstat(mdstat);
5186 sysfs_free(cc);
5187 free(subarray);
5188
5189 return ret_val;
5190 }
5191
5192 int Grow_continue(int mdfd, struct supertype *st, struct mdinfo *info,
5193 char *backup_file, int forked, int freeze_reshape)
5194 {
5195 int ret_val = 2;
5196
5197 if (!info->reshape_active)
5198 return ret_val;
5199
5200 if (st->ss->external) {
5201 int cfd = open_dev(st->container_devnm);
5202
5203 if (cfd < 0)
5204 return 1;
5205
5206 st->ss->load_container(st, cfd, st->container_devnm);
5207 close(cfd);
5208 ret_val = reshape_container(st->container_devnm, NULL, mdfd,
5209 st, info, 0, backup_file, 0,
5210 forked, 1 | info->reshape_active,
5211 freeze_reshape);
5212 } else
5213 ret_val = reshape_array(NULL, mdfd, "array", st, info, 1,
5214 NULL, INVALID_SECTORS, backup_file,
5215 0, forked, 1 | info->reshape_active,
5216 freeze_reshape);
5217
5218 return ret_val;
5219 }
5220
5221 char *make_backup(char *name)
5222 {
5223 char *base = "backup_file-";
5224 int len;
5225 char *fname;
5226
5227 len = strlen(MAP_DIR) + 1 + strlen(base) + strlen(name)+1;
5228 fname = xmalloc(len);
5229 sprintf(fname, "%s/%s%s", MAP_DIR, base, name);
5230 return fname;
5231 }
5232
5233 char *locate_backup(char *name)
5234 {
5235 char *fl = make_backup(name);
5236 struct stat stb;
5237
5238 if (stat(fl, &stb) == 0 && S_ISREG(stb.st_mode))
5239 return fl;
5240
5241 free(fl);
5242 return NULL;
5243 }
Unnamed repository; edit this file 'description' to name the repository.