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Retry HOT_REMOVE_DISK a few times.
[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 sprintf(buf, "%d:%d",
62 dev->disk.major,
63 dev->disk.minor);
64 fd = dev_open(buf, O_RDWR);
65
66 if (dev->disk.raid_disk >= 0)
67 fdlist[dev->disk.raid_disk] = fd;
68 else
69 fdlist[next_spare++] = fd;
70 }
71
72 if (!backup_file) {
73 backup_file = locate_backup(content->sys_name);
74 *backup_filep = backup_file;
75 }
76
77 if (st->ss->external && st->ss->recover_backup)
78 err = st->ss->recover_backup(st, content);
79 else
80 err = Grow_restart(st, content, fdlist, next_spare,
81 backup_file, verbose > 0);
82
83 while (next_spare > 0) {
84 next_spare--;
85 if (fdlist[next_spare] >= 0)
86 close(fdlist[next_spare]);
87 }
88 free(fdlist);
89 if (err) {
90 pr_err("Failed to restore critical section for reshape - sorry.\n");
91 if (!backup_file)
92 pr_err("Possibly you need to specify a --backup-file\n");
93 return 1;
94 }
95
96 dprintf("restore_backup() returns status OK.\n");
97 return 0;
98 }
99
100 int Grow_Add_device(char *devname, int fd, char *newdev)
101 {
102 /* Add a device to an active array.
103 * Currently, just extend a linear array.
104 * This requires writing a new superblock on the
105 * new device, calling the kernel to add the device,
106 * and if that succeeds, update the superblock on
107 * all other devices.
108 * This means that we need to *find* all other devices.
109 */
110 struct mdinfo info;
111
112 struct stat stb;
113 int nfd, fd2;
114 int d, nd;
115 struct supertype *st = NULL;
116 char *subarray = NULL;
117
118 if (ioctl(fd, GET_ARRAY_INFO, &info.array) < 0) {
119 pr_err("cannot get array info for %s\n", devname);
120 return 1;
121 }
122
123 if (info.array.level != -1) {
124 pr_err("can only add devices to linear arrays\n");
125 return 1;
126 }
127
128 st = super_by_fd(fd, &subarray);
129 if (!st) {
130 pr_err("cannot handle arrays with superblock version %d\n",
131 info.array.major_version);
132 return 1;
133 }
134
135 if (subarray) {
136 pr_err("Cannot grow linear sub-arrays yet\n");
137 free(subarray);
138 free(st);
139 return 1;
140 }
141
142 nfd = open(newdev, O_RDWR|O_EXCL|O_DIRECT);
143 if (nfd < 0) {
144 pr_err("cannot open %s\n", newdev);
145 free(st);
146 return 1;
147 }
148 fstat(nfd, &stb);
149 if ((stb.st_mode & S_IFMT) != S_IFBLK) {
150 pr_err("%s is not a block device!\n", newdev);
151 close(nfd);
152 free(st);
153 return 1;
154 }
155 /* now check out all the devices and make sure we can read the
156 * superblock */
157 for (d=0 ; d < info.array.raid_disks ; d++) {
158 mdu_disk_info_t disk;
159 char *dv;
160
161 st->ss->free_super(st);
162
163 disk.number = d;
164 if (ioctl(fd, GET_DISK_INFO, &disk) < 0) {
165 pr_err("cannot get device detail for device %d\n",
166 d);
167 close(nfd);
168 free(st);
169 return 1;
170 }
171 dv = map_dev(disk.major, disk.minor, 1);
172 if (!dv) {
173 pr_err("cannot find device file for device %d\n",
174 d);
175 close(nfd);
176 free(st);
177 return 1;
178 }
179 fd2 = dev_open(dv, O_RDWR);
180 if (fd2 < 0) {
181 pr_err("cannot open device file %s\n", dv);
182 close(nfd);
183 free(st);
184 return 1;
185 }
186
187 if (st->ss->load_super(st, fd2, NULL)) {
188 pr_err("cannot find super block on %s\n", dv);
189 close(nfd);
190 close(fd2);
191 free(st);
192 return 1;
193 }
194 close(fd2);
195 }
196 /* Ok, looks good. Lets update the superblock and write it out to
197 * newdev.
198 */
199
200 info.disk.number = d;
201 info.disk.major = major(stb.st_rdev);
202 info.disk.minor = minor(stb.st_rdev);
203 info.disk.raid_disk = d;
204 info.disk.state = (1 << MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE);
205 st->ss->update_super(st, &info, "linear-grow-new", newdev,
206 0, 0, NULL);
207
208 if (st->ss->store_super(st, nfd)) {
209 pr_err("Cannot store new superblock on %s\n",
210 newdev);
211 close(nfd);
212 return 1;
213 }
214 close(nfd);
215
216 if (ioctl(fd, ADD_NEW_DISK, &info.disk) != 0) {
217 pr_err("Cannot add new disk to this array\n");
218 return 1;
219 }
220 /* Well, that seems to have worked.
221 * Now go through and update all superblocks
222 */
223
224 if (ioctl(fd, GET_ARRAY_INFO, &info.array) < 0) {
225 pr_err("cannot get array info for %s\n", devname);
226 return 1;
227 }
228
229 nd = d;
230 for (d=0 ; d < info.array.raid_disks ; d++) {
231 mdu_disk_info_t disk;
232 char *dv;
233
234 disk.number = d;
235 if (ioctl(fd, GET_DISK_INFO, &disk) < 0) {
236 pr_err("cannot get device detail for device %d\n",
237 d);
238 return 1;
239 }
240 dv = map_dev(disk.major, disk.minor, 1);
241 if (!dv) {
242 pr_err("cannot find device file for device %d\n",
243 d);
244 return 1;
245 }
246 fd2 = dev_open(dv, O_RDWR);
247 if (fd2 < 0) {
248 pr_err("cannot open device file %s\n", dv);
249 return 1;
250 }
251 if (st->ss->load_super(st, fd2, NULL)) {
252 pr_err("cannot find super block on %s\n", dv);
253 close(fd);
254 return 1;
255 }
256 info.array.raid_disks = nd+1;
257 info.array.nr_disks = nd+1;
258 info.array.active_disks = nd+1;
259 info.array.working_disks = nd+1;
260
261 st->ss->update_super(st, &info, "linear-grow-update", dv,
262 0, 0, NULL);
263
264 if (st->ss->store_super(st, fd2)) {
265 pr_err("Cannot store new superblock on %s\n", dv);
266 close(fd2);
267 return 1;
268 }
269 close(fd2);
270 }
271
272 return 0;
273 }
274
275 int Grow_addbitmap(char *devname, int fd, struct context *c, struct shape *s)
276 {
277 /*
278 * First check that array doesn't have a bitmap
279 * Then create the bitmap
280 * Then add it
281 *
282 * For internal bitmaps, we need to check the version,
283 * find all the active devices, and write the bitmap block
284 * to all devices
285 */
286 mdu_bitmap_file_t bmf;
287 mdu_array_info_t array;
288 struct supertype *st;
289 char *subarray = NULL;
290 int major = BITMAP_MAJOR_HI;
291 int vers = md_get_version(fd);
292 unsigned long long bitmapsize, array_size;
293
294 if (vers < 9003) {
295 major = BITMAP_MAJOR_HOSTENDIAN;
296 pr_err("Warning - bitmaps created on this kernel are not portable\n"
297 " between different architectures. Consider upgrading the Linux kernel.\n");
298 }
299
300 /*
301 * We only ever get called if s->bitmap_file is != NULL, so this check
302 * is just here to quiet down static code checkers.
303 */
304 if (!s->bitmap_file)
305 return 1;
306
307 if (strcmp(s->bitmap_file, "clustered") == 0)
308 major = BITMAP_MAJOR_CLUSTERED;
309
310 if (ioctl(fd, GET_BITMAP_FILE, &bmf) != 0) {
311 if (errno == ENOMEM)
312 pr_err("Memory allocation failure.\n");
313 else
314 pr_err("bitmaps not supported by this kernel.\n");
315 return 1;
316 }
317 if (bmf.pathname[0]) {
318 if (strcmp(s->bitmap_file,"none") == 0) {
319 if (ioctl(fd, SET_BITMAP_FILE, -1) != 0) {
320 pr_err("failed to remove bitmap %s\n",
321 bmf.pathname);
322 return 1;
323 }
324 return 0;
325 }
326 pr_err("%s already has a bitmap (%s)\n",
327 devname, bmf.pathname);
328 return 1;
329 }
330 if (ioctl(fd, GET_ARRAY_INFO, &array) != 0) {
331 pr_err("cannot get array status for %s\n", devname);
332 return 1;
333 }
334 if (array.state & (1 << MD_SB_BITMAP_PRESENT)) {
335 if (strcmp(s->bitmap_file, "none")==0) {
336 array.state &= ~(1 << MD_SB_BITMAP_PRESENT);
337 if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
338 if (array.state & (1 << MD_SB_CLUSTERED))
339 pr_err("failed to remove clustered bitmap.\n");
340 else
341 pr_err("failed to remove internal bitmap.\n");
342 return 1;
343 }
344 return 0;
345 }
346 pr_err("bitmap already present on %s\n", devname);
347 return 1;
348 }
349
350 if (strcmp(s->bitmap_file, "none") == 0) {
351 pr_err("no bitmap found on %s\n", devname);
352 return 1;
353 }
354 if (array.level <= 0) {
355 pr_err("Bitmaps not meaningful with level %s\n",
356 map_num(pers, array.level)?:"of this array");
357 return 1;
358 }
359 bitmapsize = array.size;
360 bitmapsize <<= 1;
361 if (get_dev_size(fd, NULL, &array_size) &&
362 array_size > (0x7fffffffULL << 9)) {
363 /* Array is big enough that we cannot trust array.size
364 * try other approaches
365 */
366 bitmapsize = get_component_size(fd);
367 }
368 if (bitmapsize == 0) {
369 pr_err("Cannot reliably determine size of array to create bitmap - sorry.\n");
370 return 1;
371 }
372
373 if (array.level == 10) {
374 int ncopies;
375
376 ncopies = (array.layout & 255) * ((array.layout >> 8) & 255);
377 bitmapsize = bitmapsize * array.raid_disks / ncopies;
378 }
379
380 st = super_by_fd(fd, &subarray);
381 if (!st) {
382 pr_err("Cannot understand version %d.%d\n",
383 array.major_version, array.minor_version);
384 return 1;
385 }
386 if (subarray) {
387 pr_err("Cannot add bitmaps to sub-arrays yet\n");
388 free(subarray);
389 free(st);
390 return 1;
391 }
392 if (strcmp(s->bitmap_file, "internal") == 0 ||
393 strcmp(s->bitmap_file, "clustered") == 0) {
394 int rv;
395 int d;
396 int offset_setable = 0;
397 struct mdinfo *mdi;
398 if (st->ss->add_internal_bitmap == NULL) {
399 pr_err("Internal bitmaps not supported with %s metadata\n", st->ss->name);
400 return 1;
401 }
402 st->nodes = c->nodes;
403 st->cluster_name = c->homecluster;
404 mdi = sysfs_read(fd, NULL, GET_BITMAP_LOCATION);
405 if (mdi)
406 offset_setable = 1;
407 for (d = 0; d < st->max_devs; d++) {
408 mdu_disk_info_t disk;
409 char *dv;
410 int fd2;
411
412 disk.number = d;
413 if (ioctl(fd, GET_DISK_INFO, &disk) < 0)
414 continue;
415 if (disk.major == 0 && disk.minor == 0)
416 continue;
417 if ((disk.state & (1 << MD_DISK_SYNC)) == 0)
418 continue;
419 dv = map_dev(disk.major, disk.minor, 1);
420 if (!dv)
421 continue;
422 fd2 = dev_open(dv, O_RDWR);
423 if (fd2 < 0)
424 continue;
425 rv = st->ss->load_super(st, fd2, NULL);
426 if (!rv) {
427 rv = st->ss->add_internal_bitmap(
428 st, &s->bitmap_chunk, c->delay,
429 s->write_behind, bitmapsize,
430 offset_setable, major);
431 if (!rv) {
432 st->ss->write_bitmap(st, fd2,
433 NodeNumUpdate);
434 } else {
435 pr_err("failed to create internal bitmap - chunksize problem.\n");
436 }
437 } else {
438 pr_err("failed to load super-block.\n");
439 }
440 close(fd2);
441 if (rv)
442 return 1;
443 }
444 if (offset_setable) {
445 st->ss->getinfo_super(st, mdi, NULL);
446 sysfs_init(mdi, fd, NULL);
447 rv = sysfs_set_num_signed(mdi, NULL, "bitmap/location",
448 mdi->bitmap_offset);
449 } else {
450 if (strcmp(s->bitmap_file, "clustered") == 0)
451 array.state |= (1 << MD_SB_CLUSTERED);
452 array.state |= (1 << MD_SB_BITMAP_PRESENT);
453 rv = ioctl(fd, SET_ARRAY_INFO, &array);
454 }
455 if (rv < 0) {
456 if (errno == EBUSY)
457 pr_err("Cannot add bitmap while array is resyncing or reshaping etc.\n");
458 pr_err("failed to set internal bitmap.\n");
459 return 1;
460 }
461 } else {
462 int uuid[4];
463 int bitmap_fd;
464 int d;
465 int max_devs = st->max_devs;
466
467 /* try to load a superblock */
468 for (d = 0; d < max_devs; d++) {
469 mdu_disk_info_t disk;
470 char *dv;
471 int fd2;
472 disk.number = d;
473 if (ioctl(fd, GET_DISK_INFO, &disk) < 0)
474 continue;
475 if ((disk.major==0 && disk.minor == 0) ||
476 (disk.state & (1 << MD_DISK_REMOVED)))
477 continue;
478 dv = map_dev(disk.major, disk.minor, 1);
479 if (!dv)
480 continue;
481 fd2 = dev_open(dv, O_RDONLY);
482 if (fd2 >= 0) {
483 if (st->ss->load_super(st, fd2, NULL) == 0) {
484 close(fd2);
485 st->ss->uuid_from_super(st, uuid);
486 break;
487 }
488 close(fd2);
489 }
490 }
491 if (d == max_devs) {
492 pr_err("cannot find UUID for array!\n");
493 return 1;
494 }
495 if (CreateBitmap(s->bitmap_file, c->force, (char*)uuid,
496 s->bitmap_chunk, c->delay, s->write_behind,
497 bitmapsize, major)) {
498 return 1;
499 }
500 bitmap_fd = open(s->bitmap_file, O_RDWR);
501 if (bitmap_fd < 0) {
502 pr_err("weird: %s cannot be opened\n", s->bitmap_file);
503 return 1;
504 }
505 if (ioctl(fd, SET_BITMAP_FILE, bitmap_fd) < 0) {
506 int err = errno;
507 if (errno == EBUSY)
508 pr_err("Cannot add bitmap while array is resyncing or reshaping etc.\n");
509 pr_err("Cannot set bitmap file for %s: %s\n",
510 devname, strerror(err));
511 return 1;
512 }
513 }
514
515 return 0;
516 }
517
518 /*
519 * When reshaping an array we might need to backup some data.
520 * This is written to all spares with a 'super_block' describing it.
521 * The superblock goes 4K from the end of the used space on the
522 * device.
523 * It if written after the backup is complete.
524 * It has the following structure.
525 */
526
527 static struct mdp_backup_super {
528 char magic[16]; /* md_backup_data-1 or -2 */
529 __u8 set_uuid[16];
530 __u64 mtime;
531 /* start/sizes in 512byte sectors */
532 __u64 devstart; /* address on backup device/file of data */
533 __u64 arraystart;
534 __u64 length;
535 __u32 sb_csum; /* csum of preceeding bytes. */
536 __u32 pad1;
537 __u64 devstart2; /* offset in to data of second section */
538 __u64 arraystart2;
539 __u64 length2;
540 __u32 sb_csum2; /* csum of preceeding bytes. */
541 __u8 pad[512-68-32];
542 } __attribute__((aligned(512))) bsb, bsb2;
543
544 static __u32 bsb_csum(char *buf, int len)
545 {
546 int i;
547 int csum = 0;
548 for (i = 0; i < len; i++)
549 csum = (csum<<3) + buf[0];
550 return __cpu_to_le32(csum);
551 }
552
553 static int check_idle(struct supertype *st)
554 {
555 /* Check that all member arrays for this container, or the
556 * container of this array, are idle
557 */
558 char *container = (st->container_devnm[0]
559 ? st->container_devnm : st->devnm);
560 struct mdstat_ent *ent, *e;
561 int is_idle = 1;
562
563 ent = mdstat_read(0, 0);
564 for (e = ent ; e; e = e->next) {
565 if (!is_container_member(e, container))
566 continue;
567 if (e->percent >= 0) {
568 is_idle = 0;
569 break;
570 }
571 }
572 free_mdstat(ent);
573 return is_idle;
574 }
575
576 static int freeze_container(struct supertype *st)
577 {
578 char *container = (st->container_devnm[0]
579 ? st->container_devnm : st->devnm);
580
581 if (!check_idle(st))
582 return -1;
583
584 if (block_monitor(container, 1)) {
585 pr_err("failed to freeze container\n");
586 return -2;
587 }
588
589 return 1;
590 }
591
592 static void unfreeze_container(struct supertype *st)
593 {
594 char *container = (st->container_devnm[0]
595 ? st->container_devnm : st->devnm);
596
597 unblock_monitor(container, 1);
598 }
599
600 static int freeze(struct supertype *st)
601 {
602 /* Try to freeze resync/rebuild on this array/container.
603 * Return -1 if the array is busy,
604 * return -2 container cannot be frozen,
605 * return 0 if this kernel doesn't support 'frozen'
606 * return 1 if it worked.
607 */
608 if (st->ss->external)
609 return freeze_container(st);
610 else {
611 struct mdinfo *sra = sysfs_read(-1, st->devnm, GET_VERSION);
612 int err;
613 char buf[20];
614
615 if (!sra)
616 return -1;
617 /* Need to clear any 'read-auto' status */
618 if (sysfs_get_str(sra, NULL, "array_state", buf, 20) > 0 &&
619 strncmp(buf, "read-auto", 9) == 0)
620 sysfs_set_str(sra, NULL, "array_state", "clean");
621
622 err = sysfs_freeze_array(sra);
623 sysfs_free(sra);
624 return err;
625 }
626 }
627
628 static void unfreeze(struct supertype *st)
629 {
630 if (st->ss->external)
631 return unfreeze_container(st);
632 else {
633 struct mdinfo *sra = sysfs_read(-1, st->devnm, GET_VERSION);
634 char buf[20];
635
636 if (sra &&
637 sysfs_get_str(sra, NULL, "sync_action", buf, 20) > 0
638 && strcmp(buf, "frozen\n") == 0)
639 sysfs_set_str(sra, NULL, "sync_action", "idle");
640 sysfs_free(sra);
641 }
642 }
643
644 static void wait_reshape(struct mdinfo *sra)
645 {
646 int fd = sysfs_get_fd(sra, NULL, "sync_action");
647 char action[20];
648
649 if (fd < 0)
650 return;
651
652 while (sysfs_fd_get_str(fd, action, 20) > 0 &&
653 strncmp(action, "reshape", 7) == 0)
654 sysfs_wait(fd, NULL);
655 close(fd);
656 }
657
658 static int reshape_super(struct supertype *st, unsigned long long size,
659 int level, int layout, int chunksize, int raid_disks,
660 int delta_disks, char *backup_file, char *dev,
661 int direction, int verbose)
662 {
663 /* nothing extra to check in the native case */
664 if (!st->ss->external)
665 return 0;
666 if (!st->ss->reshape_super ||
667 !st->ss->manage_reshape) {
668 pr_err("%s metadata does not support reshape\n",
669 st->ss->name);
670 return 1;
671 }
672
673 return st->ss->reshape_super(st, size, level, layout, chunksize,
674 raid_disks, delta_disks, backup_file, dev,
675 direction, verbose);
676 }
677
678 static void sync_metadata(struct supertype *st)
679 {
680 if (st->ss->external) {
681 if (st->update_tail) {
682 flush_metadata_updates(st);
683 st->update_tail = &st->updates;
684 } else
685 st->ss->sync_metadata(st);
686 }
687 }
688
689 static int subarray_set_num(char *container, struct mdinfo *sra, char *name, int n)
690 {
691 /* when dealing with external metadata subarrays we need to be
692 * prepared to handle EAGAIN. The kernel may need to wait for
693 * mdmon to mark the array active so the kernel can handle
694 * allocations/writeback when preparing the reshape action
695 * (md_allow_write()). We temporarily disable safe_mode_delay
696 * to close a race with the array_state going clean before the
697 * next write to raid_disks / stripe_cache_size
698 */
699 char safe[50];
700 int rc;
701
702 /* only 'raid_disks' and 'stripe_cache_size' trigger md_allow_write */
703 if (!container ||
704 (strcmp(name, "raid_disks") != 0 &&
705 strcmp(name, "stripe_cache_size") != 0))
706 return sysfs_set_num(sra, NULL, name, n);
707
708 rc = sysfs_get_str(sra, NULL, "safe_mode_delay", safe, sizeof(safe));
709 if (rc <= 0)
710 return -1;
711 sysfs_set_num(sra, NULL, "safe_mode_delay", 0);
712 rc = sysfs_set_num(sra, NULL, name, n);
713 if (rc < 0 && errno == EAGAIN) {
714 ping_monitor(container);
715 /* if we get EAGAIN here then the monitor is not active
716 * so stop trying
717 */
718 rc = sysfs_set_num(sra, NULL, name, n);
719 }
720 sysfs_set_str(sra, NULL, "safe_mode_delay", safe);
721 return rc;
722 }
723
724 int start_reshape(struct mdinfo *sra, int already_running,
725 int before_data_disks, int data_disks)
726 {
727 int err;
728 unsigned long long sync_max_to_set;
729
730 sysfs_set_num(sra, NULL, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL);
731 err = sysfs_set_num(sra, NULL, "suspend_hi", sra->reshape_progress);
732 err = err ?: sysfs_set_num(sra, NULL, "suspend_lo",
733 sra->reshape_progress);
734 if (before_data_disks <= data_disks)
735 sync_max_to_set = sra->reshape_progress / data_disks;
736 else
737 sync_max_to_set = (sra->component_size * data_disks
738 - sra->reshape_progress) / data_disks;
739 if (!already_running)
740 sysfs_set_num(sra, NULL, "sync_min", sync_max_to_set);
741 err = err ?: sysfs_set_num(sra, NULL, "sync_max", sync_max_to_set);
742 if (!already_running && err == 0) {
743 int cnt = 5;
744 do {
745 err = sysfs_set_str(sra, NULL, "sync_action", "reshape");
746 if (err)
747 sleep(1);
748 } while (err && errno == EBUSY && cnt-- > 0);
749 }
750 return err;
751 }
752
753 void abort_reshape(struct mdinfo *sra)
754 {
755 sysfs_set_str(sra, NULL, "sync_action", "idle");
756 /*
757 * Prior to kernel commit: 23ddff3792f6 ("md: allow suspend_lo and
758 * suspend_hi to decrease as well as increase.")
759 * you could only increase suspend_{lo,hi} unless the region they
760 * covered was empty. So to reset to 0, you need to push suspend_lo
761 * up past suspend_hi first. So to maximize the chance of mdadm
762 * working on all kernels, we want to keep doing that.
763 */
764 sysfs_set_num(sra, NULL, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL);
765 sysfs_set_num(sra, NULL, "suspend_hi", 0);
766 sysfs_set_num(sra, NULL, "suspend_lo", 0);
767 sysfs_set_num(sra, NULL, "sync_min", 0);
768 // It isn't safe to reset sync_max as we aren't monitoring.
769 // Array really should be stopped at this point.
770 }
771
772 int remove_disks_for_takeover(struct supertype *st,
773 struct mdinfo *sra,
774 int layout)
775 {
776 int nr_of_copies;
777 struct mdinfo *remaining;
778 int slot;
779
780 if (st->ss->external) {
781 int rv = 0;
782 struct mdinfo *arrays = st->ss->container_content(st, NULL);
783 /*
784 * containter_content returns list of arrays in container
785 * If arrays->next is not NULL it means that there are
786 * 2 arrays in container and operation should be blocked
787 */
788 if (arrays) {
789 if (arrays->next)
790 rv = 1;
791 sysfs_free(arrays);
792 if (rv) {
793 pr_err("Error. Cannot perform operation on /dev/%s\n", st->devnm);
794 pr_err("For this operation it MUST be single array in container\n");
795 return rv;
796 }
797 }
798 }
799
800 if (sra->array.level == 10)
801 nr_of_copies = layout & 0xff;
802 else if (sra->array.level == 1)
803 nr_of_copies = sra->array.raid_disks;
804 else
805 return 1;
806
807 remaining = sra->devs;
808 sra->devs = NULL;
809 /* for each 'copy', select one device and remove from the list. */
810 for (slot = 0; slot < sra->array.raid_disks; slot += nr_of_copies) {
811 struct mdinfo **diskp;
812 int found = 0;
813
814 /* Find a working device to keep */
815 for (diskp = &remaining; *diskp ; diskp = &(*diskp)->next) {
816 struct mdinfo *disk = *diskp;
817
818 if (disk->disk.raid_disk < slot)
819 continue;
820 if (disk->disk.raid_disk >= slot + nr_of_copies)
821 continue;
822 if (disk->disk.state & (1<<MD_DISK_REMOVED))
823 continue;
824 if (disk->disk.state & (1<<MD_DISK_FAULTY))
825 continue;
826 if (!(disk->disk.state & (1<<MD_DISK_SYNC)))
827 continue;
828
829 /* We have found a good disk to use! */
830 *diskp = disk->next;
831 disk->next = sra->devs;
832 sra->devs = disk;
833 found = 1;
834 break;
835 }
836 if (!found)
837 break;
838 }
839
840 if (slot < sra->array.raid_disks) {
841 /* didn't find all slots */
842 struct mdinfo **e;
843 e = &remaining;
844 while (*e)
845 e = &(*e)->next;
846 *e = sra->devs;
847 sra->devs = remaining;
848 return 1;
849 }
850
851 /* Remove all 'remaining' devices from the array */
852 while (remaining) {
853 struct mdinfo *sd = remaining;
854 remaining = sd->next;
855
856 sysfs_set_str(sra, sd, "state", "faulty");
857 sysfs_set_str(sra, sd, "slot", "none");
858 /* for external metadata disks should be removed in mdmon */
859 if (!st->ss->external)
860 sysfs_set_str(sra, sd, "state", "remove");
861 sd->disk.state |= (1<<MD_DISK_REMOVED);
862 sd->disk.state &= ~(1<<MD_DISK_SYNC);
863 sd->next = sra->devs;
864 sra->devs = sd;
865 }
866 return 0;
867 }
868
869 void reshape_free_fdlist(int *fdlist,
870 unsigned long long *offsets,
871 int size)
872 {
873 int i;
874
875 for (i = 0; i < size; i++)
876 if (fdlist[i] >= 0)
877 close(fdlist[i]);
878
879 free(fdlist);
880 free(offsets);
881 }
882
883 int reshape_prepare_fdlist(char *devname,
884 struct mdinfo *sra,
885 int raid_disks,
886 int nrdisks,
887 unsigned long blocks,
888 char *backup_file,
889 int *fdlist,
890 unsigned long long *offsets)
891 {
892 int d = 0;
893 struct mdinfo *sd;
894
895 enable_fds(nrdisks);
896 for (d = 0; d <= nrdisks; d++)
897 fdlist[d] = -1;
898 d = raid_disks;
899 for (sd = sra->devs; sd; sd = sd->next) {
900 if (sd->disk.state & (1<<MD_DISK_FAULTY))
901 continue;
902 if (sd->disk.state & (1<<MD_DISK_SYNC) &&
903 sd->disk.raid_disk < raid_disks) {
904 char *dn = map_dev(sd->disk.major,
905 sd->disk.minor, 1);
906 fdlist[sd->disk.raid_disk]
907 = dev_open(dn, O_RDONLY);
908 offsets[sd->disk.raid_disk] = sd->data_offset*512;
909 if (fdlist[sd->disk.raid_disk] < 0) {
910 pr_err("%s: cannot open component %s\n",
911 devname, dn ? dn : "-unknown-");
912 d = -1;
913 goto release;
914 }
915 } else if (backup_file == NULL) {
916 /* spare */
917 char *dn = map_dev(sd->disk.major,
918 sd->disk.minor, 1);
919 fdlist[d] = dev_open(dn, O_RDWR);
920 offsets[d] = (sd->data_offset + sra->component_size - blocks - 8)*512;
921 if (fdlist[d] < 0) {
922 pr_err("%s: cannot open component %s\n",
923 devname, dn ? dn : "-unknown-");
924 d = -1;
925 goto release;
926 }
927 d++;
928 }
929 }
930 release:
931 return d;
932 }
933
934 int reshape_open_backup_file(char *backup_file,
935 int fd,
936 char *devname,
937 long blocks,
938 int *fdlist,
939 unsigned long long *offsets,
940 char *sys_name,
941 int restart)
942 {
943 /* Return 1 on success, 0 on any form of failure */
944 /* need to check backup file is large enough */
945 char buf[512];
946 struct stat stb;
947 unsigned int dev;
948 int i;
949
950 *fdlist = open(backup_file, O_RDWR|O_CREAT|(restart ? O_TRUNC : O_EXCL),
951 S_IRUSR | S_IWUSR);
952 *offsets = 8 * 512;
953 if (*fdlist < 0) {
954 pr_err("%s: cannot create backup file %s: %s\n",
955 devname, backup_file, strerror(errno));
956 return 0;
957 }
958 /* Guard against backup file being on array device.
959 * If array is partitioned or if LVM etc is in the
960 * way this will not notice, but it is better than
961 * nothing.
962 */
963 fstat(*fdlist, &stb);
964 dev = stb.st_dev;
965 fstat(fd, &stb);
966 if (stb.st_rdev == dev) {
967 pr_err("backup file must NOT be on the array being reshaped.\n");
968 close(*fdlist);
969 return 0;
970 }
971
972 memset(buf, 0, 512);
973 for (i=0; i < blocks + 8 ; i++) {
974 if (write(*fdlist, buf, 512) != 512) {
975 pr_err("%s: cannot create backup file %s: %s\n",
976 devname, backup_file, strerror(errno));
977 return 0;
978 }
979 }
980 if (fsync(*fdlist) != 0) {
981 pr_err("%s: cannot create backup file %s: %s\n",
982 devname, backup_file, strerror(errno));
983 return 0;
984 }
985
986 if (!restart && strncmp(backup_file, MAP_DIR, strlen(MAP_DIR)) != 0) {
987 char *bu = make_backup(sys_name);
988 if (symlink(backup_file, bu))
989 pr_err("Recording backup file in " MAP_DIR " failed: %s\n",
990 strerror(errno));
991 free(bu);
992 }
993
994 return 1;
995 }
996
997 unsigned long compute_backup_blocks(int nchunk, int ochunk,
998 unsigned int ndata, unsigned int odata)
999 {
1000 unsigned long a, b, blocks;
1001 /* So how much do we need to backup.
1002 * We need an amount of data which is both a whole number of
1003 * old stripes and a whole number of new stripes.
1004 * So LCM for (chunksize*datadisks).
1005 */
1006 a = (ochunk/512) * odata;
1007 b = (nchunk/512) * ndata;
1008 /* Find GCD */
1009 a = GCD(a, b);
1010 /* LCM == product / GCD */
1011 blocks = (ochunk/512) * (nchunk/512) * odata * ndata / a;
1012
1013 return blocks;
1014 }
1015
1016 char *analyse_change(char *devname, struct mdinfo *info, struct reshape *re)
1017 {
1018 /* Based on the current array state in info->array and
1019 * the changes in info->new_* etc, determine:
1020 * - whether the change is possible
1021 * - Intermediate level/raid_disks/layout
1022 * - whether a restriping reshape is needed
1023 * - number of sectors in minimum change unit. This
1024 * will cover a whole number of stripes in 'before' and
1025 * 'after'.
1026 *
1027 * Return message if the change should be rejected
1028 * NULL if the change can be achieved
1029 *
1030 * This can be called as part of starting a reshape, or
1031 * when assembling an array that is undergoing reshape.
1032 */
1033 int near, far, offset, copies;
1034 int new_disks;
1035 int old_chunk, new_chunk;
1036 /* delta_parity records change in number of devices
1037 * caused by level change
1038 */
1039 int delta_parity = 0;
1040
1041 memset(re, 0, sizeof(*re));
1042
1043 /* If a new level not explicitly given, we assume no-change */
1044 if (info->new_level == UnSet)
1045 info->new_level = info->array.level;
1046
1047 if (info->new_chunk)
1048 switch (info->new_level) {
1049 case 0:
1050 case 4:
1051 case 5:
1052 case 6:
1053 case 10:
1054 /* chunk size is meaningful, must divide component_size
1055 * evenly
1056 */
1057 if (info->component_size % (info->new_chunk/512)) {
1058 unsigned long long shrink = info->component_size;
1059 shrink &= ~(unsigned long long)(info->new_chunk/512-1);
1060 pr_err("New chunk size (%dK) does not evenly divide device size (%lluk)\n",
1061 info->new_chunk/1024, info->component_size/2);
1062 pr_err("After shrinking any filesystem, \"mdadm --grow %s --size %llu\"\n",
1063 devname, shrink/2);
1064 pr_err("will shrink the array so the given chunk size would work.\n");
1065 return "";
1066 }
1067 break;
1068 default:
1069 return "chunk size not meaningful for this level";
1070 }
1071 else
1072 info->new_chunk = info->array.chunk_size;
1073
1074 switch (info->array.level) {
1075 default:
1076 return "No reshape is possibly for this RAID level";
1077 case LEVEL_LINEAR:
1078 if (info->delta_disks != UnSet)
1079 return "Only --add is supported for LINEAR, setting --raid-disks is not needed";
1080 else
1081 return "Only --add is supported for LINEAR, other --grow options are not meaningful";
1082 case 1:
1083 /* RAID1 can convert to RAID1 with different disks, or
1084 * raid5 with 2 disks, or
1085 * raid0 with 1 disk
1086 */
1087 if (info->new_level > 1 &&
1088 (info->component_size & 7))
1089 return "Cannot convert RAID1 of this size - reduce size to multiple of 4K first.";
1090 if (info->new_level == 0) {
1091 if (info->delta_disks != UnSet &&
1092 info->delta_disks != 0)
1093 return "Cannot change number of disks with RAID1->RAID0 conversion";
1094 re->level = 0;
1095 re->before.data_disks = 1;
1096 re->after.data_disks = 1;
1097 return NULL;
1098 }
1099 if (info->new_level == 1) {
1100 if (info->delta_disks == UnSet)
1101 /* Don't know what to do */
1102 return "no change requested for Growing RAID1";
1103 re->level = 1;
1104 return NULL;
1105 }
1106 if (info->array.raid_disks != 2 &&
1107 info->new_level == 5)
1108 return "Can only convert a 2-device array to RAID5";
1109 if (info->array.raid_disks == 2 &&
1110 info->new_level == 5) {
1111
1112 re->level = 5;
1113 re->before.data_disks = 1;
1114 if (info->delta_disks != UnSet &&
1115 info->delta_disks != 0)
1116 re->after.data_disks = 1 + info->delta_disks;
1117 else
1118 re->after.data_disks = 1;
1119 if (re->after.data_disks < 1)
1120 return "Number of disks too small for RAID5";
1121
1122 re->before.layout = ALGORITHM_LEFT_SYMMETRIC;
1123 info->array.chunk_size = 65536;
1124 break;
1125 }
1126 /* Could do some multi-stage conversions, but leave that to
1127 * later.
1128 */
1129 return "Impossibly level change request for RAID1";
1130
1131 case 10:
1132 /* RAID10 can be converted from near mode to
1133 * RAID0 by removing some devices.
1134 * It can also be reshaped if the kernel supports
1135 * new_data_offset.
1136 */
1137 switch (info->new_level) {
1138 case 0:
1139 if ((info->array.layout & ~0xff) != 0x100)
1140 return "Cannot Grow RAID10 with far/offset layout";
1141 /* number of devices must be multiple of number of copies */
1142 if (info->array.raid_disks % (info->array.layout & 0xff))
1143 return "RAID10 layout too complex for Grow operation";
1144
1145 new_disks = (info->array.raid_disks
1146 / (info->array.layout & 0xff));
1147 if (info->delta_disks == UnSet)
1148 info->delta_disks = (new_disks
1149 - info->array.raid_disks);
1150
1151 if (info->delta_disks != new_disks - info->array.raid_disks)
1152 return "New number of raid-devices impossible for RAID10";
1153 if (info->new_chunk &&
1154 info->new_chunk != info->array.chunk_size)
1155 return "Cannot change chunk-size with RAID10 Grow";
1156
1157 /* looks good */
1158 re->level = 0;
1159 re->before.data_disks = new_disks;
1160 re->after.data_disks = re->before.data_disks;
1161 return NULL;
1162
1163 case 10:
1164 near = info->array.layout & 0xff;
1165 far = (info->array.layout >> 8) & 0xff;
1166 offset = info->array.layout & 0x10000;
1167 if (far > 1 && !offset)
1168 return "Cannot reshape RAID10 in far-mode";
1169 copies = near * far;
1170
1171 old_chunk = info->array.chunk_size * far;
1172
1173 if (info->new_layout == UnSet)
1174 info->new_layout = info->array.layout;
1175 else {
1176 near = info->new_layout & 0xff;
1177 far = (info->new_layout >> 8) & 0xff;
1178 offset = info->new_layout & 0x10000;
1179 if (far > 1 && !offset)
1180 return "Cannot reshape RAID10 to far-mode";
1181 if (near * far != copies)
1182 return "Cannot change number of copies when reshaping RAID10";
1183 }
1184 if (info->delta_disks == UnSet)
1185 info->delta_disks = 0;
1186 new_disks = (info->array.raid_disks +
1187 info->delta_disks);
1188
1189 new_chunk = info->new_chunk * far;
1190
1191 re->level = 10;
1192 re->before.layout = info->array.layout;
1193 re->before.data_disks = info->array.raid_disks;
1194 re->after.layout = info->new_layout;
1195 re->after.data_disks = new_disks;
1196 /* For RAID10 we don't do backup but do allow reshape,
1197 * so set backup_blocks to INVALID_SECTORS rather than
1198 * zero.
1199 * And there is no need to synchronise stripes on both
1200 * 'old' and 'new'. So the important
1201 * number is the minimum data_offset difference
1202 * which is the larger of (offset copies * chunk).
1203 */
1204 re->backup_blocks = INVALID_SECTORS;
1205 re->min_offset_change = max(old_chunk, new_chunk) / 512;
1206 if (new_disks < re->before.data_disks &&
1207 info->space_after < re->min_offset_change)
1208 /* Reduce component size by one chunk */
1209 re->new_size = (info->component_size -
1210 re->min_offset_change);
1211 else
1212 re->new_size = info->component_size;
1213 re->new_size = re->new_size * new_disks / copies;
1214 return NULL;
1215
1216 default:
1217 return "RAID10 can only be changed to RAID0";
1218 }
1219 case 0:
1220 /* RAID0 can be converted to RAID10, or to RAID456 */
1221 if (info->new_level == 10) {
1222 if (info->new_layout == UnSet && info->delta_disks == UnSet) {
1223 /* Assume near=2 layout */
1224 info->new_layout = 0x102;
1225 info->delta_disks = info->array.raid_disks;
1226 }
1227 if (info->new_layout == UnSet) {
1228 int copies = 1 + (info->delta_disks
1229 / info->array.raid_disks);
1230 if (info->array.raid_disks * (copies-1)
1231 != info->delta_disks)
1232 return "Impossible number of devices for RAID0->RAID10";
1233 info->new_layout = 0x100 + copies;
1234 }
1235 if (info->delta_disks == UnSet) {
1236 int copies = info->new_layout & 0xff;
1237 if (info->new_layout != 0x100 + copies)
1238 return "New layout impossible for RAID0->RAID10";;
1239 info->delta_disks = (copies - 1) *
1240 info->array.raid_disks;
1241 }
1242 if (info->new_chunk &&
1243 info->new_chunk != info->array.chunk_size)
1244 return "Cannot change chunk-size with RAID0->RAID10";
1245 /* looks good */
1246 re->level = 10;
1247 re->before.data_disks = (info->array.raid_disks +
1248 info->delta_disks);
1249 re->after.data_disks = re->before.data_disks;
1250 re->before.layout = info->new_layout;
1251 return NULL;
1252 }
1253
1254 /* RAID0 can also covert to RAID0/4/5/6 by first converting to
1255 * a raid4 style layout of the final level.
1256 */
1257 switch (info->new_level) {
1258 case 4:
1259 delta_parity = 1;
1260 case 0:
1261 re->level = 4;
1262 re->before.layout = 0;
1263 break;
1264 case 5:
1265 delta_parity = 1;
1266 re->level = 5;
1267 re->before.layout = ALGORITHM_PARITY_N;
1268 if (info->new_layout == UnSet)
1269 info->new_layout = map_name(r5layout, "default");
1270 break;
1271 case 6:
1272 delta_parity = 2;
1273 re->level = 6;
1274 re->before.layout = ALGORITHM_PARITY_N;
1275 if (info->new_layout == UnSet)
1276 info->new_layout = map_name(r6layout, "default");
1277 break;
1278 default:
1279 return "Impossible level change requested";
1280 }
1281 re->before.data_disks = info->array.raid_disks;
1282 /* determining 'after' layout happens outside this 'switch' */
1283 break;
1284
1285 case 4:
1286 info->array.layout = ALGORITHM_PARITY_N;
1287 case 5:
1288 switch (info->new_level) {
1289 case 0:
1290 delta_parity = -1;
1291 case 4:
1292 re->level = info->array.level;
1293 re->before.data_disks = info->array.raid_disks - 1;
1294 re->before.layout = info->array.layout;
1295 break;
1296 case 5:
1297 re->level = 5;
1298 re->before.data_disks = info->array.raid_disks - 1;
1299 re->before.layout = info->array.layout;
1300 break;
1301 case 6:
1302 delta_parity = 1;
1303 re->level = 6;
1304 re->before.data_disks = info->array.raid_disks - 1;
1305 switch (info->array.layout) {
1306 case ALGORITHM_LEFT_ASYMMETRIC:
1307 re->before.layout = ALGORITHM_LEFT_ASYMMETRIC_6;
1308 break;
1309 case ALGORITHM_RIGHT_ASYMMETRIC:
1310 re->before.layout = ALGORITHM_RIGHT_ASYMMETRIC_6;
1311 break;
1312 case ALGORITHM_LEFT_SYMMETRIC:
1313 re->before.layout = ALGORITHM_LEFT_SYMMETRIC_6;
1314 break;
1315 case ALGORITHM_RIGHT_SYMMETRIC:
1316 re->before.layout = ALGORITHM_RIGHT_SYMMETRIC_6;
1317 break;
1318 case ALGORITHM_PARITY_0:
1319 re->before.layout = ALGORITHM_PARITY_0_6;
1320 break;
1321 case ALGORITHM_PARITY_N:
1322 re->before.layout = ALGORITHM_PARITY_N_6;
1323 break;
1324 default:
1325 return "Cannot convert an array with this layout";
1326 }
1327 break;
1328 case 1:
1329 if (info->array.raid_disks != 2)
1330 return "Can only convert a 2-device array to RAID1";
1331 if (info->delta_disks != UnSet &&
1332 info->delta_disks != 0)
1333 return "Cannot set raid_disk when converting RAID5->RAID1";
1334 re->level = 1;
1335 info->new_chunk = 0;
1336 return NULL;
1337 default:
1338 return "Impossible level change requested";
1339 }
1340 break;
1341 case 6:
1342 switch (info->new_level) {
1343 case 4:
1344 case 5:
1345 delta_parity = -1;
1346 case 6:
1347 re->level = 6;
1348 re->before.data_disks = info->array.raid_disks - 2;
1349 re->before.layout = info->array.layout;
1350 break;
1351 default:
1352 return "Impossible level change requested";
1353 }
1354 break;
1355 }
1356
1357 /* If we reached here then it looks like a re-stripe is
1358 * happening. We have determined the intermediate level
1359 * and initial raid_disks/layout and stored these in 're'.
1360 *
1361 * We need to deduce the final layout that can be atomically
1362 * converted to the end state.
1363 */
1364 switch (info->new_level) {
1365 case 0:
1366 /* We can only get to RAID0 from RAID4 or RAID5
1367 * with appropriate layout and one extra device
1368 */
1369 if (re->level != 4 && re->level != 5)
1370 return "Cannot covert to RAID0 from this level";
1371
1372 switch (re->level) {
1373 case 4:
1374 re->before.layout = 0;
1375 re->after.layout = 0;
1376 break;
1377 case 5:
1378 re->after.layout = ALGORITHM_PARITY_N;
1379 break;
1380 }
1381 break;
1382
1383 case 4:
1384 /* We can only get to RAID4 from RAID5 */
1385 if (re->level != 4 && re->level != 5)
1386 return "Cannot convert to RAID4 from this level";
1387
1388 switch (re->level) {
1389 case 4:
1390 re->after.layout = 0;
1391 break;
1392 case 5:
1393 re->after.layout = ALGORITHM_PARITY_N;
1394 break;
1395 }
1396 break;
1397
1398 case 5:
1399 /* We get to RAID5 from RAID5 or RAID6 */
1400 if (re->level != 5 && re->level != 6)
1401 return "Cannot convert to RAID5 from this level";
1402
1403 switch (re->level) {
1404 case 5:
1405 if (info->new_layout == UnSet)
1406 re->after.layout = re->before.layout;
1407 else
1408 re->after.layout = info->new_layout;
1409 break;
1410 case 6:
1411 if (info->new_layout == UnSet)
1412 info->new_layout = re->before.layout;
1413
1414 /* after.layout needs to be raid6 version of new_layout */
1415 if (info->new_layout == ALGORITHM_PARITY_N)
1416 re->after.layout = ALGORITHM_PARITY_N;
1417 else {
1418 char layout[40];
1419 char *ls = map_num(r5layout, info->new_layout);
1420 int l;
1421 if (ls) {
1422 /* Current RAID6 layout has a RAID5
1423 * equivalent - good
1424 */
1425 strcat(strcpy(layout, ls), "-6");
1426 l = map_name(r6layout, layout);
1427 if (l == UnSet)
1428 return "Cannot find RAID6 layout to convert to";
1429 } else {
1430 /* Current RAID6 has no equivalent.
1431 * If it is already a '-6' layout we
1432 * can leave it unchanged, else we must
1433 * fail
1434 */
1435 ls = map_num(r6layout, info->new_layout);
1436 if (!ls ||
1437 strcmp(ls+strlen(ls)-2, "-6") != 0)
1438 return "Please specify new layout";
1439 l = info->new_layout;
1440 }
1441 re->after.layout = l;
1442 }
1443 }
1444 break;
1445
1446 case 6:
1447 /* We must already be at level 6 */
1448 if (re->level != 6)
1449 return "Impossible level change";
1450 if (info->new_layout == UnSet)
1451 re->after.layout = info->array.layout;
1452 else
1453 re->after.layout = info->new_layout;
1454 break;
1455 default:
1456 return "Impossible level change requested";
1457 }
1458 if (info->delta_disks == UnSet)
1459 info->delta_disks = delta_parity;
1460
1461 re->after.data_disks = (re->before.data_disks
1462 + info->delta_disks
1463 - delta_parity);
1464 switch (re->level) {
1465 case 6: re->parity = 2;
1466 break;
1467 case 4:
1468 case 5: re->parity = 1;
1469 break;
1470 default: re->parity = 0;
1471 break;
1472 }
1473 /* So we have a restripe operation, we need to calculate the number
1474 * of blocks per reshape operation.
1475 */
1476 re->new_size = info->component_size * re->before.data_disks;
1477 if (info->new_chunk == 0)
1478 info->new_chunk = info->array.chunk_size;
1479 if (re->after.data_disks == re->before.data_disks &&
1480 re->after.layout == re->before.layout &&
1481 info->new_chunk == info->array.chunk_size) {
1482 /* Nothing to change, can change level immediately. */
1483 re->level = info->new_level;
1484 re->backup_blocks = 0;
1485 return NULL;
1486 }
1487 if (re->after.data_disks == 1 && re->before.data_disks == 1) {
1488 /* chunk and layout changes make no difference */
1489 re->level = info->new_level;
1490 re->backup_blocks = 0;
1491 return NULL;
1492 }
1493
1494 if (re->after.data_disks == re->before.data_disks &&
1495 get_linux_version() < 2006032)
1496 return "in-place reshape is not safe before 2.6.32 - sorry.";
1497
1498 if (re->after.data_disks < re->before.data_disks &&
1499 get_linux_version() < 2006030)
1500 return "reshape to fewer devices is not supported before 2.6.30 - sorry.";
1501
1502 re->backup_blocks = compute_backup_blocks(
1503 info->new_chunk, info->array.chunk_size,
1504 re->after.data_disks,
1505 re->before.data_disks);
1506 re->min_offset_change = re->backup_blocks / re->before.data_disks;
1507
1508 re->new_size = info->component_size * re->after.data_disks;
1509 return NULL;
1510 }
1511
1512 static int set_array_size(struct supertype *st, struct mdinfo *sra,
1513 char *text_version)
1514 {
1515 struct mdinfo *info;
1516 char *subarray;
1517 int ret_val = -1;
1518
1519 if ((st == NULL) || (sra == NULL))
1520 return ret_val;
1521
1522 if (text_version == NULL)
1523 text_version = sra->text_version;
1524 subarray = strchr(text_version+1, '/')+1;
1525 info = st->ss->container_content(st, subarray);
1526 if (info) {
1527 unsigned long long current_size = 0;
1528 unsigned long long new_size =
1529 info->custom_array_size/2;
1530
1531 if (sysfs_get_ll(sra, NULL, "array_size", &current_size) == 0 &&
1532 new_size > current_size) {
1533 if (sysfs_set_num(sra, NULL, "array_size", new_size)
1534 < 0)
1535 dprintf("Error: Cannot set array size");
1536 else {
1537 ret_val = 0;
1538 dprintf("Array size changed");
1539 }
1540 dprintf_cont(" from %llu to %llu.\n",
1541 current_size, new_size);
1542 }
1543 sysfs_free(info);
1544 } else
1545 dprintf("Error: set_array_size(): info pointer in NULL\n");
1546
1547 return ret_val;
1548 }
1549
1550 static int reshape_array(char *container, int fd, char *devname,
1551 struct supertype *st, struct mdinfo *info,
1552 int force, struct mddev_dev *devlist,
1553 unsigned long long data_offset,
1554 char *backup_file, int verbose, int forked,
1555 int restart, int freeze_reshape);
1556 static int reshape_container(char *container, char *devname,
1557 int mdfd,
1558 struct supertype *st,
1559 struct mdinfo *info,
1560 int force,
1561 char *backup_file, int verbose,
1562 int forked, int restart, int freeze_reshape);
1563
1564 int Grow_reshape(char *devname, int fd,
1565 struct mddev_dev *devlist,
1566 unsigned long long data_offset,
1567 struct context *c, struct shape *s)
1568 {
1569 /* Make some changes in the shape of an array.
1570 * The kernel must support the change.
1571 *
1572 * There are three different changes. Each can trigger
1573 * a resync or recovery so we freeze that until we have
1574 * requested everything (if kernel supports freezing - 2.6.30).
1575 * The steps are:
1576 * - change size (i.e. component_size)
1577 * - change level
1578 * - change layout/chunksize/ndisks
1579 *
1580 * The last can require a reshape. It is different on different
1581 * levels so we need to check the level before actioning it.
1582 * Some times the level change needs to be requested after the
1583 * reshape (e.g. raid6->raid5, raid5->raid0)
1584 *
1585 */
1586 struct mdu_array_info_s array;
1587 int rv = 0;
1588 struct supertype *st;
1589 char *subarray = NULL;
1590
1591 int frozen;
1592 int changed = 0;
1593 char *container = NULL;
1594 int cfd = -1;
1595
1596 struct mddev_dev *dv;
1597 int added_disks;
1598
1599 struct mdinfo info;
1600 struct mdinfo *sra;
1601
1602 if (ioctl(fd, GET_ARRAY_INFO, &array) < 0) {
1603 pr_err("%s is not an active md array - aborting\n",
1604 devname);
1605 return 1;
1606 }
1607 if (data_offset != INVALID_SECTORS && array.level != 10
1608 && (array.level < 4 || array.level > 6)) {
1609 pr_err("--grow --data-offset not yet supported\n");
1610 return 1;
1611 }
1612
1613 if (s->size > 0 &&
1614 (s->chunk || s->level!= UnSet || s->layout_str || s->raiddisks)) {
1615 pr_err("cannot change component size at the same time as other changes.\n"
1616 " Change size first, then check data is intact before making other changes.\n");
1617 return 1;
1618 }
1619
1620 if (s->raiddisks && s->raiddisks < array.raid_disks && array.level > 1 &&
1621 get_linux_version() < 2006032 &&
1622 !check_env("MDADM_FORCE_FEWER")) {
1623 pr_err("reducing the number of devices is not safe before Linux 2.6.32\n"
1624 " Please use a newer kernel\n");
1625 return 1;
1626 }
1627
1628 st = super_by_fd(fd, &subarray);
1629 if (!st) {
1630 pr_err("Unable to determine metadata format for %s\n", devname);
1631 return 1;
1632 }
1633 if (s->raiddisks > st->max_devs) {
1634 pr_err("Cannot increase raid-disks on this array beyond %d\n", st->max_devs);
1635 return 1;
1636 }
1637 if (s->level == 0 &&
1638 (array.state & (1<<MD_SB_BITMAP_PRESENT)) &&
1639 !(array.state & (1<<MD_SB_CLUSTERED))) {
1640 array.state &= ~(1<<MD_SB_BITMAP_PRESENT);
1641 if (ioctl(fd, SET_ARRAY_INFO, &array)!= 0) {
1642 pr_err("failed to remove internal bitmap.\n");
1643 return 1;
1644 }
1645 }
1646
1647 /* in the external case we need to check that the requested reshape is
1648 * supported, and perform an initial check that the container holds the
1649 * pre-requisite spare devices (mdmon owns final validation)
1650 */
1651 if (st->ss->external) {
1652 int rv;
1653
1654 if (subarray) {
1655 container = st->container_devnm;
1656 cfd = open_dev_excl(st->container_devnm);
1657 } else {
1658 container = st->devnm;
1659 close(fd);
1660 cfd = open_dev_excl(st->devnm);
1661 fd = cfd;
1662 }
1663 if (cfd < 0) {
1664 pr_err("Unable to open container for %s\n",
1665 devname);
1666 free(subarray);
1667 return 1;
1668 }
1669
1670 rv = st->ss->load_container(st, cfd, NULL);
1671
1672 if (rv) {
1673 pr_err("Cannot read superblock for %s\n",
1674 devname);
1675 free(subarray);
1676 return 1;
1677 }
1678
1679 /* check if operation is supported for metadata handler */
1680 if (st->ss->container_content) {
1681 struct mdinfo *cc = NULL;
1682 struct mdinfo *content = NULL;
1683
1684 cc = st->ss->container_content(st, subarray);
1685 for (content = cc; content ; content = content->next) {
1686 int allow_reshape = 1;
1687
1688 /* check if reshape is allowed based on metadata
1689 * indications stored in content.array.status
1690 */
1691 if (content->array.state & (1<<MD_SB_BLOCK_VOLUME))
1692 allow_reshape = 0;
1693 if (content->array.state
1694 & (1<<MD_SB_BLOCK_CONTAINER_RESHAPE))
1695 allow_reshape = 0;
1696 if (!allow_reshape) {
1697 pr_err("cannot reshape arrays in container with unsupported metadata: %s(%s)\n",
1698 devname, container);
1699 sysfs_free(cc);
1700 free(subarray);
1701 return 1;
1702 }
1703 }
1704 sysfs_free(cc);
1705 }
1706 if (mdmon_running(container))
1707 st->update_tail = &st->updates;
1708 }
1709
1710 added_disks = 0;
1711 for (dv = devlist; dv; dv = dv->next)
1712 added_disks++;
1713 if (s->raiddisks > array.raid_disks &&
1714 array.spare_disks +added_disks < (s->raiddisks - array.raid_disks) &&
1715 !c->force) {
1716 pr_err("Need %d spare%s to avoid degraded array, and only have %d.\n"
1717 " Use --force to over-ride this check.\n",
1718 s->raiddisks - array.raid_disks,
1719 s->raiddisks - array.raid_disks == 1 ? "" : "s",
1720 array.spare_disks + added_disks);
1721 return 1;
1722 }
1723
1724 sra = sysfs_read(fd, NULL, GET_LEVEL | GET_DISKS | GET_DEVS
1725 | GET_STATE | GET_VERSION);
1726 if (sra) {
1727 if (st->ss->external && subarray == NULL) {
1728 array.level = LEVEL_CONTAINER;
1729 sra->array.level = LEVEL_CONTAINER;
1730 }
1731 } else {
1732 pr_err("failed to read sysfs parameters for %s\n",
1733 devname);
1734 return 1;
1735 }
1736 frozen = freeze(st);
1737 if (frozen < -1) {
1738 /* freeze() already spewed the reason */
1739 sysfs_free(sra);
1740 return 1;
1741 } else if (frozen < 0) {
1742 pr_err("%s is performing resync/recovery and cannot be reshaped\n", devname);
1743 sysfs_free(sra);
1744 return 1;
1745 }
1746
1747 /* ========= set size =============== */
1748 if (s->size > 0 && (s->size == MAX_SIZE || s->size != (unsigned)array.size)) {
1749 unsigned long long orig_size = get_component_size(fd)/2;
1750 unsigned long long min_csize;
1751 struct mdinfo *mdi;
1752 int raid0_takeover = 0;
1753
1754 if (orig_size == 0)
1755 orig_size = (unsigned) array.size;
1756
1757 if (orig_size == 0) {
1758 pr_err("Cannot set device size in this type of array.\n");
1759 rv = 1;
1760 goto release;
1761 }
1762
1763 if (reshape_super(st, s->size, UnSet, UnSet, 0, 0, UnSet, NULL,
1764 devname, APPLY_METADATA_CHANGES, c->verbose > 0)) {
1765 rv = 1;
1766 goto release;
1767 }
1768 sync_metadata(st);
1769 if (st->ss->external) {
1770 /* metadata can have size limitation
1771 * update size value according to metadata information
1772 */
1773 struct mdinfo *sizeinfo =
1774 st->ss->container_content(st, subarray);
1775 if (sizeinfo) {
1776 unsigned long long new_size =
1777 sizeinfo->custom_array_size/2;
1778 int data_disks = get_data_disks(
1779 sizeinfo->array.level,
1780 sizeinfo->array.layout,
1781 sizeinfo->array.raid_disks);
1782 new_size /= data_disks;
1783 dprintf("Metadata size correction from %llu to %llu (%llu)\n", orig_size, new_size,
1784 new_size * data_disks);
1785 s->size = new_size;
1786 sysfs_free(sizeinfo);
1787 }
1788 }
1789
1790 /* Update the size of each member device in case
1791 * they have been resized. This will never reduce
1792 * below the current used-size. The "size" attribute
1793 * understands '0' to mean 'max'.
1794 */
1795 min_csize = 0;
1796 rv = 0;
1797 for (mdi = sra->devs; mdi; mdi = mdi->next) {
1798 if (sysfs_set_num(sra, mdi, "size",
1799 s->size == MAX_SIZE ? 0 : s->size) < 0) {
1800 /* Probably kernel refusing to let us
1801 * reduce the size - not an error.
1802 */
1803 break;
1804 }
1805 if (array.not_persistent == 0 &&
1806 array.major_version == 0 &&
1807 get_linux_version() < 3001000) {
1808 /* Dangerous to allow size to exceed 2TB */
1809 unsigned long long csize;
1810 if (sysfs_get_ll(sra, mdi, "size", &csize) == 0) {
1811 if (csize >= 2ULL*1024*1024*1024)
1812 csize = 2ULL*1024*1024*1024;
1813 if ((min_csize == 0 || (min_csize
1814 > csize)))
1815 min_csize = csize;
1816 }
1817 }
1818 }
1819 if (rv) {
1820 pr_err("Cannot set size on array members.\n");
1821 goto size_change_error;
1822 }
1823 if (min_csize && s->size > min_csize) {
1824 pr_err("Cannot safely make this array use more than 2TB per device on this kernel.\n");
1825 rv = 1;
1826 goto size_change_error;
1827 }
1828 if (min_csize && s->size == MAX_SIZE) {
1829 /* Don't let the kernel choose a size - it will get
1830 * it wrong
1831 */
1832 pr_err("Limited v0.90 array to 2TB per device\n");
1833 s->size = min_csize;
1834 }
1835 if (st->ss->external) {
1836 if (sra->array.level == 0) {
1837 rv = sysfs_set_str(sra, NULL, "level",
1838 "raid5");
1839 if (!rv) {
1840 raid0_takeover = 1;
1841 /* get array parameters after takeover
1842 * to change one parameter at time only
1843 */
1844 rv = ioctl(fd, GET_ARRAY_INFO, &array);
1845 }
1846 }
1847 /* make sure mdmon is
1848 * aware of the new level */
1849 if (!mdmon_running(st->container_devnm))
1850 start_mdmon(st->container_devnm);
1851 ping_monitor(container);
1852 if (mdmon_running(st->container_devnm) &&
1853 st->update_tail == NULL)
1854 st->update_tail = &st->updates;
1855 }
1856
1857 if (s->size == MAX_SIZE)
1858 s->size = 0;
1859 array.size = s->size;
1860 if (s->size & ~INT32_MAX) {
1861 /* got truncated to 32bit, write to
1862 * component_size instead
1863 */
1864 if (sra)
1865 rv = sysfs_set_num(sra, NULL,
1866 "component_size", s->size);
1867 else
1868 rv = -1;
1869 } else {
1870 rv = ioctl(fd, SET_ARRAY_INFO, &array);
1871
1872 /* manage array size when it is managed externally
1873 */
1874 if ((rv == 0) && st->ss->external)
1875 rv = set_array_size(st, sra, sra->text_version);
1876 }
1877
1878 if (raid0_takeover) {
1879 /* do not recync non-existing parity,
1880 * we will drop it anyway
1881 */
1882 sysfs_set_str(sra, NULL, "sync_action", "frozen");
1883 /* go back to raid0, drop parity disk
1884 */
1885 sysfs_set_str(sra, NULL, "level", "raid0");
1886 ioctl(fd, GET_ARRAY_INFO, &array);
1887 }
1888
1889 size_change_error:
1890 if (rv != 0) {
1891 int err = errno;
1892
1893 /* restore metadata */
1894 if (reshape_super(st, orig_size, UnSet, UnSet, 0, 0,
1895 UnSet, NULL, devname,
1896 ROLLBACK_METADATA_CHANGES,
1897 c->verbose) == 0)
1898 sync_metadata(st);
1899 pr_err("Cannot set device size for %s: %s\n",
1900 devname, strerror(err));
1901 if (err == EBUSY &&
1902 (array.state & (1<<MD_SB_BITMAP_PRESENT)))
1903 cont_err("Bitmap must be removed before size can be changed\n");
1904 rv = 1;
1905 goto release;
1906 }
1907 if (s->assume_clean) {
1908 /* This will fail on kernels older than 3.0 unless
1909 * a backport has been arranged.
1910 */
1911 if (sra == NULL ||
1912 sysfs_set_str(sra, NULL, "resync_start", "none") < 0)
1913 pr_err("--assume-clean not supported with --grow on this kernel\n");
1914 }
1915 ioctl(fd, GET_ARRAY_INFO, &array);
1916 s->size = get_component_size(fd)/2;
1917 if (s->size == 0)
1918 s->size = array.size;
1919 if (c->verbose >= 0) {
1920 if (s->size == orig_size)
1921 pr_err("component size of %s unchanged at %lluK\n",
1922 devname, s->size);
1923 else
1924 pr_err("component size of %s has been set to %lluK\n",
1925 devname, s->size);
1926 }
1927 changed = 1;
1928 } else if (array.level != LEVEL_CONTAINER) {
1929 s->size = get_component_size(fd)/2;
1930 if (s->size == 0)
1931 s->size = array.size;
1932 }
1933
1934 /* See if there is anything else to do */
1935 if ((s->level == UnSet || s->level == array.level) &&
1936 (s->layout_str == NULL) &&
1937 (s->chunk == 0 || s->chunk == array.chunk_size) &&
1938 data_offset == INVALID_SECTORS &&
1939 (s->raiddisks == 0 || s->raiddisks == array.raid_disks)) {
1940 /* Nothing more to do */
1941 if (!changed && c->verbose >= 0)
1942 pr_err("%s: no change requested\n",
1943 devname);
1944 goto release;
1945 }
1946
1947 /* ========= check for Raid10/Raid1 -> Raid0 conversion ===============
1948 * current implementation assumes that following conditions must be met:
1949 * - RAID10:
1950 * - far_copies == 1
1951 * - near_copies == 2
1952 */
1953 if ((s->level == 0 && array.level == 10 && sra &&
1954 array.layout == ((1 << 8) + 2) && !(array.raid_disks & 1)) ||
1955 (s->level == 0 && array.level == 1 && sra)) {
1956 int err;
1957 err = remove_disks_for_takeover(st, sra, array.layout);
1958 if (err) {
1959 dprintf("Array cannot be reshaped\n");
1960 if (cfd > -1)
1961 close(cfd);
1962 rv = 1;
1963 goto release;
1964 }
1965 /* Make sure mdmon has seen the device removal
1966 * and updated metadata before we continue with
1967 * level change
1968 */
1969 if (container)
1970 ping_monitor(container);
1971 }
1972
1973 memset(&info, 0, sizeof(info));
1974 info.array = array;
1975 sysfs_init(&info, fd, NULL);
1976 strcpy(info.text_version, sra->text_version);
1977 info.component_size = s->size*2;
1978 info.new_level = s->level;
1979 info.new_chunk = s->chunk * 1024;
1980 if (info.array.level == LEVEL_CONTAINER) {
1981 info.delta_disks = UnSet;
1982 info.array.raid_disks = s->raiddisks;
1983 } else if (s->raiddisks)
1984 info.delta_disks = s->raiddisks - info.array.raid_disks;
1985 else
1986 info.delta_disks = UnSet;
1987 if (s->layout_str == NULL) {
1988 info.new_layout = UnSet;
1989 if (info.array.level == 6 &&
1990 (info.new_level == 6 || info.new_level == UnSet) &&
1991 info.array.layout >= 16) {
1992 pr_err("%s has a non-standard layout. If you wish to preserve this\n", devname);
1993 cont_err("during the reshape, please specify --layout=preserve\n");
1994 cont_err("If you want to change it, specify a layout or use --layout=normalise\n");
1995 rv = 1;
1996 goto release;
1997 }
1998 } else if (strcmp(s->layout_str, "normalise") == 0 ||
1999 strcmp(s->layout_str, "normalize") == 0) {
2000 /* If we have a -6 RAID6 layout, remove the '-6'. */
2001 info.new_layout = UnSet;
2002 if (info.array.level == 6 && info.new_level == UnSet) {
2003 char l[40], *h;
2004 strcpy(l, map_num(r6layout, info.array.layout));
2005 h = strrchr(l, '-');
2006 if (h && strcmp(h, "-6") == 0) {
2007 *h = 0;
2008 info.new_layout = map_name(r6layout, l);
2009 }
2010 } else {
2011 pr_err("%s is only meaningful when reshaping a RAID6 array.\n", s->layout_str);
2012 rv = 1;
2013 goto release;
2014 }
2015 } else if (strcmp(s->layout_str, "preserve") == 0) {
2016 /* This means that a non-standard RAID6 layout
2017 * is OK.
2018 * In particular:
2019 * - When reshape a RAID6 (e.g. adding a device)
2020 * which is in a non-standard layout, it is OK
2021 * to preserve that layout.
2022 * - When converting a RAID5 to RAID6, leave it in
2023 * the XXX-6 layout, don't re-layout.
2024 */
2025 if (info.array.level == 6 && info.new_level == UnSet)
2026 info.new_layout = info.array.layout;
2027 else if (info.array.level == 5 && info.new_level == 6) {
2028 char l[40];
2029 strcpy(l, map_num(r5layout, info.array.layout));
2030 strcat(l, "-6");
2031 info.new_layout = map_name(r6layout, l);
2032 } else {
2033 pr_err("%s in only meaningful when reshaping to RAID6\n", s->layout_str);
2034 rv = 1;
2035 goto release;
2036 }
2037 } else {
2038 int l = info.new_level;
2039 if (l == UnSet)
2040 l = info.array.level;
2041 switch (l) {
2042 case 5:
2043 info.new_layout = map_name(r5layout, s->layout_str);
2044 break;
2045 case 6:
2046 info.new_layout = map_name(r6layout, s->layout_str);
2047 break;
2048 case 10:
2049 info.new_layout = parse_layout_10(s->layout_str);
2050 break;
2051 case LEVEL_FAULTY:
2052 info.new_layout = parse_layout_faulty(s->layout_str);
2053 break;
2054 default:
2055 pr_err("layout not meaningful with this level\n");
2056 rv = 1;
2057 goto release;
2058 }
2059 if (info.new_layout == UnSet) {
2060 pr_err("layout %s not understood for this level\n",
2061 s->layout_str);
2062 rv = 1;
2063 goto release;
2064 }
2065 }
2066
2067 if (array.level == LEVEL_FAULTY) {
2068 if (s->level != UnSet && s->level != array.level) {
2069 pr_err("cannot change level of Faulty device\n");
2070 rv =1 ;
2071 }
2072 if (s->chunk) {
2073 pr_err("cannot set chunksize of Faulty device\n");
2074 rv =1 ;
2075 }
2076 if (s->raiddisks && s->raiddisks != 1) {
2077 pr_err("cannot set raid_disks of Faulty device\n");
2078 rv =1 ;
2079 }
2080 if (s->layout_str) {
2081 if (ioctl(fd, GET_ARRAY_INFO, &array) != 0) {
2082 dprintf("Cannot get array information.\n");
2083 goto release;
2084 }
2085 array.layout = info.new_layout;
2086 if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
2087 pr_err("failed to set new layout\n");
2088 rv = 1;
2089 } else if (c->verbose >= 0)
2090 printf("layout for %s set to %d\n",
2091 devname, array.layout);
2092 }
2093 } else if (array.level == LEVEL_CONTAINER) {
2094 /* This change is to be applied to every array in the
2095 * container. This is only needed when the metadata imposes
2096 * restraints of the various arrays in the container.
2097 * Currently we only know that IMSM requires all arrays
2098 * to have the same number of devices so changing the
2099 * number of devices (On-Line Capacity Expansion) must be
2100 * performed at the level of the container
2101 */
2102 if (fd > 0) {
2103 close(fd);
2104 fd = -1;
2105 }
2106 rv = reshape_container(container, devname, -1, st, &info,
2107 c->force, c->backup_file, c->verbose, 0, 0, 0);
2108 frozen = 0;
2109 } else {
2110 /* get spare devices from external metadata
2111 */
2112 if (st->ss->external) {
2113 struct mdinfo *info2;
2114
2115 info2 = st->ss->container_content(st, subarray);
2116 if (info2) {
2117 info.array.spare_disks =
2118 info2->array.spare_disks;
2119 sysfs_free(info2);
2120 }
2121 }
2122
2123 /* Impose these changes on a single array. First
2124 * check that the metadata is OK with the change. */
2125
2126 if (reshape_super(st, 0, info.new_level,
2127 info.new_layout, info.new_chunk,
2128 info.array.raid_disks, info.delta_disks,
2129 c->backup_file, devname, APPLY_METADATA_CHANGES,
2130 c->verbose)) {
2131 rv = 1;
2132 goto release;
2133 }
2134 sync_metadata(st);
2135 rv = reshape_array(container, fd, devname, st, &info, c->force,
2136 devlist, data_offset, c->backup_file, c->verbose,
2137 0, 0, 0);
2138 frozen = 0;
2139 }
2140 release:
2141 sysfs_free(sra);
2142 if (frozen > 0)
2143 unfreeze(st);
2144 return rv;
2145 }
2146
2147 /* verify_reshape_position()
2148 * Function checks if reshape position in metadata is not farther
2149 * than position in md.
2150 * Return value:
2151 * 0 : not valid sysfs entry
2152 * it can be caused by not started reshape, it should be started
2153 * by reshape array or raid0 array is before takeover
2154 * -1 : error, reshape position is obviously wrong
2155 * 1 : success, reshape progress correct or updated
2156 */
2157 static int verify_reshape_position(struct mdinfo *info, int level)
2158 {
2159 int ret_val = 0;
2160 char buf[40];
2161 int rv;
2162
2163 /* read sync_max, failure can mean raid0 array */
2164 rv = sysfs_get_str(info, NULL, "sync_max", buf, 40);
2165
2166 if (rv > 0) {
2167 char *ep;
2168 unsigned long long position = strtoull(buf, &ep, 0);
2169
2170 dprintf("Read sync_max sysfs entry is: %s\n", buf);
2171 if (!(ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' '))) {
2172 position *= get_data_disks(level,
2173 info->new_layout,
2174 info->array.raid_disks);
2175 if (info->reshape_progress < position) {
2176 dprintf("Corrected reshape progress (%llu) to md position (%llu)\n",
2177 info->reshape_progress, position);
2178 info->reshape_progress = position;
2179 ret_val = 1;
2180 } else if (info->reshape_progress > position) {
2181 pr_err("Fatal error: array reshape was not properly frozen (expected reshape position is %llu, but reshape progress is %llu.\n",
2182 position, info->reshape_progress);
2183 ret_val = -1;
2184 } else {
2185 dprintf("Reshape position in md and metadata are the same;");
2186 ret_val = 1;
2187 }
2188 }
2189 } else if (rv == 0) {
2190 /* for valid sysfs entry, 0-length content
2191 * should be indicated as error
2192 */
2193 ret_val = -1;
2194 }
2195
2196 return ret_val;
2197 }
2198
2199 static unsigned long long choose_offset(unsigned long long lo,
2200 unsigned long long hi,
2201 unsigned long long min,
2202 unsigned long long max)
2203 {
2204 /* Choose a new offset between hi and lo.
2205 * It must be between min and max, but
2206 * we would prefer something near the middle of hi/lo, and also
2207 * prefer to be aligned to a big power of 2.
2208 *
2209 * So we start with the middle, then for each bit,
2210 * starting at '1' and increasing, if it is set, we either
2211 * add it or subtract it if possible, preferring the option
2212 * which is furthest from the boundary.
2213 *
2214 * We stop once we get a 1MB alignment. As units are in sectors,
2215 * 1MB = 2*1024 sectors.
2216 */
2217 unsigned long long choice = (lo + hi) / 2;
2218 unsigned long long bit = 1;
2219
2220 for (bit = 1; bit < 2*1024; bit = bit << 1) {
2221 unsigned long long bigger, smaller;
2222 if (! (bit & choice))
2223 continue;
2224 bigger = choice + bit;
2225 smaller = choice - bit;
2226 if (bigger > max && smaller < min)
2227 break;
2228 if (bigger > max)
2229 choice = smaller;
2230 else if (smaller < min)
2231 choice = bigger;
2232 else if (hi - bigger > smaller - lo)
2233 choice = bigger;
2234 else
2235 choice = smaller;
2236 }
2237 return choice;
2238 }
2239
2240 static int set_new_data_offset(struct mdinfo *sra, struct supertype *st,
2241 char *devname, int delta_disks,
2242 unsigned long long data_offset,
2243 unsigned long long min,
2244 int can_fallback)
2245 {
2246 struct mdinfo *sd;
2247 int dir = 0;
2248 int err = 0;
2249 unsigned long long before, after;
2250
2251 /* Need to find min space before and after so same is used
2252 * on all devices
2253 */
2254 before = UINT64_MAX;
2255 after = UINT64_MAX;
2256 for (sd = sra->devs; sd; sd = sd->next) {
2257 char *dn;
2258 int dfd;
2259 int rv;
2260 struct supertype *st2;
2261 struct mdinfo info2;
2262
2263 if (sd->disk.state & (1<<MD_DISK_FAULTY))
2264 continue;
2265 dn = map_dev(sd->disk.major, sd->disk.minor, 0);
2266 dfd = dev_open(dn, O_RDONLY);
2267 if (dfd < 0) {
2268 pr_err("%s: cannot open component %s\n",
2269 devname, dn ? dn : "-unknown-");
2270 goto release;
2271 }
2272 st2 = dup_super(st);
2273 rv = st2->ss->load_super(st2,dfd, NULL);
2274 close(dfd);
2275 if (rv) {
2276 free(st2);
2277 pr_err("%s: cannot get superblock from %s\n",
2278 devname, dn);
2279 goto release;
2280 }
2281 st2->ss->getinfo_super(st2, &info2, NULL);
2282 st2->ss->free_super(st2);
2283 free(st2);
2284 if (info2.space_before == 0 &&
2285 info2.space_after == 0) {
2286 /* Metadata doesn't support data_offset changes */
2287 if (!can_fallback)
2288 pr_err("%s: Metadata version doesn't support data_offset changes\n",
2289 devname);
2290 goto fallback;
2291 }
2292 if (before > info2.space_before)
2293 before = info2.space_before;
2294 if (after > info2.space_after)
2295 after = info2.space_after;
2296
2297 if (data_offset != INVALID_SECTORS) {
2298 if (dir == 0) {
2299 if (info2.data_offset == data_offset) {
2300 pr_err("%s: already has that data_offset\n",
2301 dn);
2302 goto release;
2303 }
2304 if (data_offset < info2.data_offset)
2305 dir = -1;
2306 else
2307 dir = 1;
2308 } else if ((data_offset <= info2.data_offset && dir == 1) ||
2309 (data_offset >= info2.data_offset && dir == -1)) {
2310 pr_err("%s: differing data offsets on devices make this --data-offset setting impossible\n",
2311 dn);
2312 goto release;
2313 }
2314 }
2315 }
2316 if (before == UINT64_MAX)
2317 /* impossible really, there must be no devices */
2318 return 1;
2319
2320 for (sd = sra->devs; sd; sd = sd->next) {
2321 char *dn = map_dev(sd->disk.major, sd->disk.minor, 0);
2322 unsigned long long new_data_offset;
2323
2324 if (sd->disk.state & (1<<MD_DISK_FAULTY))
2325 continue;
2326 if (delta_disks < 0) {
2327 /* Don't need any space as array is shrinking
2328 * just move data_offset up by min
2329 */
2330 if (data_offset == INVALID_SECTORS)
2331 new_data_offset = sd->data_offset + min;
2332 else {
2333 if (data_offset < sd->data_offset + min) {
2334 pr_err("--data-offset too small for %s\n",
2335 dn);
2336 goto release;
2337 }
2338 new_data_offset = data_offset;
2339 }
2340 } else if (delta_disks > 0) {
2341 /* need space before */
2342 if (before < min) {
2343 if (can_fallback)
2344 goto fallback;
2345 pr_err("Insufficient head-space for reshape on %s\n",
2346 dn);
2347 goto release;
2348 }
2349 if (data_offset == INVALID_SECTORS)
2350 new_data_offset = sd->data_offset - min;
2351 else {
2352 if (data_offset > sd->data_offset - min) {
2353 pr_err("--data-offset too large for %s\n",
2354 dn);
2355 goto release;
2356 }
2357 new_data_offset = data_offset;
2358 }
2359 } else {
2360 if (dir == 0) {
2361 /* can move up or down. If 'data_offset'
2362 * was set we would have already decided,
2363 * so just choose direction with most space.
2364 */
2365 if (before > after)
2366 dir = -1;
2367 else
2368 dir = 1;
2369 }
2370 sysfs_set_str(sra, NULL, "reshape_direction",
2371 dir == 1 ? "backwards" : "forwards");
2372 if (dir > 0) {
2373 /* Increase data offset */
2374 if (after < min) {
2375 if (can_fallback)
2376 goto fallback;
2377 pr_err("Insufficient tail-space for reshape on %s\n",
2378 dn);
2379 goto release;
2380 }
2381 if (data_offset != INVALID_SECTORS &&
2382 data_offset < sd->data_offset + min) {
2383 pr_err("--data-offset too small on %s\n",
2384 dn);
2385 goto release;
2386 }
2387 if (data_offset != INVALID_SECTORS)
2388 new_data_offset = data_offset;
2389 else
2390 new_data_offset = choose_offset(sd->data_offset,
2391 sd->data_offset + after,
2392 sd->data_offset + min,
2393 sd->data_offset + after);
2394 } else {
2395 /* Decrease data offset */
2396 if (before < min) {
2397 if (can_fallback)
2398 goto fallback;
2399 pr_err("insufficient head-room on %s\n",
2400 dn);
2401 goto release;
2402 }
2403 if (data_offset != INVALID_SECTORS &&
2404 data_offset < sd->data_offset - min) {
2405 pr_err("--data-offset too small on %s\n",
2406 dn);
2407 goto release;
2408 }
2409 if (data_offset != INVALID_SECTORS)
2410 new_data_offset = data_offset;
2411 else
2412 new_data_offset = choose_offset(sd->data_offset - before,
2413 sd->data_offset,
2414 sd->data_offset - before,
2415 sd->data_offset - min);
2416 }
2417 }
2418 err = sysfs_set_num(sra, sd, "new_offset", new_data_offset);
2419 if (err < 0 && errno == E2BIG) {
2420 /* try again after increasing data size to max */
2421 err = sysfs_set_num(sra, sd, "size", 0);
2422 if (err < 0 && errno == EINVAL &&
2423 !(sd->disk.state & (1<<MD_DISK_SYNC))) {
2424 /* some kernels have a bug where you cannot
2425 * use '0' on spare devices. */
2426 sysfs_set_num(sra, sd, "size",
2427 (sra->component_size + after)/2);
2428 }
2429 err = sysfs_set_num(sra, sd, "new_offset",
2430 new_data_offset);
2431 }
2432 if (err < 0) {
2433 if (errno == E2BIG && data_offset != INVALID_SECTORS) {
2434 pr_err("data-offset is too big for %s\n",
2435 dn);
2436 goto release;
2437 }
2438 if (sd == sra->devs &&
2439 (errno == ENOENT || errno == E2BIG))
2440 /* Early kernel, no 'new_offset' file,
2441 * or kernel doesn't like us.
2442 * For RAID5/6 this is not fatal
2443 */
2444 return 1;
2445 pr_err("Cannot set new_offset for %s\n",
2446 dn);
2447 break;
2448 }
2449 }
2450 return err;
2451 release:
2452 return -1;
2453 fallback:
2454 /* Just use a backup file */
2455 return 1;
2456 }
2457
2458 static int raid10_reshape(char *container, int fd, char *devname,
2459 struct supertype *st, struct mdinfo *info,
2460 struct reshape *reshape,
2461 unsigned long long data_offset,
2462 int force, int verbose)
2463 {
2464 /* Changing raid_disks, layout, chunksize or possibly
2465 * just data_offset for a RAID10.
2466 * We must always change data_offset. We change by at least
2467 * ->min_offset_change which is the largest of the old and new
2468 * chunk sizes.
2469 * If raid_disks is increasing, then data_offset must decrease
2470 * by at least this copy size.
2471 * If raid_disks is unchanged, data_offset must increase or
2472 * decrease by at least min_offset_change but preferably by much more.
2473 * We choose half of the available space.
2474 * If raid_disks is decreasing, data_offset must increase by
2475 * at least min_offset_change. To allow of this, component_size
2476 * must be decreased by the same amount.
2477 *
2478 * So we calculate the required minimum and direction, possibly
2479 * reduce the component_size, then iterate through the devices
2480 * and set the new_data_offset.
2481 * If that all works, we set chunk_size, layout, raid_disks, and start
2482 * 'reshape'
2483 */
2484 struct mdinfo *sra;
2485 unsigned long long min;
2486 int err = 0;
2487
2488 sra = sysfs_read(fd, NULL,
2489 GET_COMPONENT|GET_DEVS|GET_OFFSET|GET_STATE|GET_CHUNK
2490 );
2491 if (!sra) {
2492 pr_err("%s: Cannot get array details from sysfs\n",
2493 devname);
2494 goto release;
2495 }
2496 min = reshape->min_offset_change;
2497
2498 if (info->delta_disks)
2499 sysfs_set_str(sra, NULL, "reshape_direction",
2500 info->delta_disks < 0 ? "backwards" : "forwards");
2501 if (info->delta_disks < 0 &&
2502 info->space_after < min) {
2503 int rv = sysfs_set_num(sra, NULL, "component_size",
2504 (sra->component_size -
2505 min)/2);
2506 if (rv) {
2507 pr_err("cannot reduce component size\n");
2508 goto release;
2509 }
2510 }
2511 err = set_new_data_offset(sra, st, devname, info->delta_disks, data_offset,
2512 min, 0);
2513 if (err == 1) {
2514 pr_err("Cannot set new_data_offset: RAID10 reshape not\n");
2515 cont_err("supported on this kernel\n");
2516 err = -1;
2517 }
2518 if (err < 0)
2519 goto release;
2520
2521 if (!err && sysfs_set_num(sra, NULL, "chunk_size", info->new_chunk) < 0)
2522 err = errno;
2523 if (!err && sysfs_set_num(sra, NULL, "layout", reshape->after.layout) < 0)
2524 err = errno;
2525 if (!err && sysfs_set_num(sra, NULL, "raid_disks",
2526 info->array.raid_disks + info->delta_disks) < 0)
2527 err = errno;
2528 if (!err && sysfs_set_str(sra, NULL, "sync_action", "reshape") < 0)
2529 err = errno;
2530 if (err) {
2531 pr_err("Cannot set array shape for %s\n",
2532 devname);
2533 if (err == EBUSY &&
2534 (info->array.state & (1<<MD_SB_BITMAP_PRESENT)))
2535 cont_err(" Bitmap must be removed before shape can be changed\n");
2536 goto release;
2537 }
2538 sysfs_free(sra);
2539 return 0;
2540 release:
2541 sysfs_free(sra);
2542 return 1;
2543 }
2544
2545 static void get_space_after(int fd, struct supertype *st, struct mdinfo *info)
2546 {
2547 struct mdinfo *sra, *sd;
2548 /* Initialisation to silence compiler warning */
2549 unsigned long long min_space_before = 0, min_space_after = 0;
2550 int first = 1;
2551
2552 sra = sysfs_read(fd, NULL, GET_DEVS);
2553 if (!sra)
2554 return;
2555 for (sd = sra->devs; sd; sd = sd->next) {
2556 char *dn;
2557 int dfd;
2558 struct supertype *st2;
2559 struct mdinfo info2;
2560
2561 if (sd->disk.state & (1<<MD_DISK_FAULTY))
2562 continue;
2563 dn = map_dev(sd->disk.major, sd->disk.minor, 0);
2564 dfd = dev_open(dn, O_RDONLY);
2565 if (dfd < 0)
2566 break;
2567 st2 = dup_super(st);
2568 if (st2->ss->load_super(st2,dfd, NULL)) {
2569 close(dfd);
2570 free(st2);
2571 break;
2572 }
2573 close(dfd);
2574 st2->ss->getinfo_super(st2, &info2, NULL);
2575 st2->ss->free_super(st2);
2576 free(st2);
2577 if (first ||
2578 min_space_before > info2.space_before)
2579 min_space_before = info2.space_before;
2580 if (first ||
2581 min_space_after > info2.space_after)
2582 min_space_after = info2.space_after;
2583 first = 0;
2584 }
2585 if (sd == NULL && !first) {
2586 info->space_after = min_space_after;
2587 info->space_before = min_space_before;
2588 }
2589 sysfs_free(sra);
2590 }
2591
2592 static void update_cache_size(char *container, struct mdinfo *sra,
2593 struct mdinfo *info,
2594 int disks, unsigned long long blocks)
2595 {
2596 /* Check that the internal stripe cache is
2597 * large enough, or it won't work.
2598 * It must hold at least 4 stripes of the larger
2599 * chunk size
2600 */
2601 unsigned long cache;
2602 cache = max(info->array.chunk_size, info->new_chunk);
2603 cache *= 4; /* 4 stripes minimum */
2604 cache /= 512; /* convert to sectors */
2605 /* make sure there is room for 'blocks' with a bit to spare */
2606 if (cache < 16 + blocks / disks)
2607 cache = 16 + blocks / disks;
2608 cache /= (4096/512); /* Convert from sectors to pages */
2609
2610 if (sra->cache_size < cache)
2611 subarray_set_num(container, sra, "stripe_cache_size",
2612 cache+1);
2613 }
2614
2615 static int impose_reshape(struct mdinfo *sra,
2616 struct mdinfo *info,
2617 struct supertype *st,
2618 int fd,
2619 int restart,
2620 char *devname, char *container,
2621 struct reshape *reshape)
2622 {
2623 struct mdu_array_info_s array;
2624
2625 sra->new_chunk = info->new_chunk;
2626
2627 if (restart) {
2628 /* for external metadata checkpoint saved by mdmon can be lost
2629 * or missed /due to e.g. crash/. Check if md is not during
2630 * restart farther than metadata points to.
2631 * If so, this means metadata information is obsolete.
2632 */
2633 if (st->ss->external)
2634 verify_reshape_position(info, reshape->level);
2635 sra->reshape_progress = info->reshape_progress;
2636 } else {
2637 sra->reshape_progress = 0;
2638 if (reshape->after.data_disks < reshape->before.data_disks)
2639 /* start from the end of the new array */
2640 sra->reshape_progress = (sra->component_size
2641 * reshape->after.data_disks);
2642 }
2643
2644 ioctl(fd, GET_ARRAY_INFO, &array);
2645 if (info->array.chunk_size == info->new_chunk &&
2646 reshape->before.layout == reshape->after.layout &&
2647 st->ss->external == 0) {
2648 /* use SET_ARRAY_INFO but only if reshape hasn't started */
2649 array.raid_disks = reshape->after.data_disks + reshape->parity;
2650 if (!restart &&
2651 ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
2652 int err = errno;
2653
2654 pr_err("Cannot set device shape for %s: %s\n",
2655 devname, strerror(errno));
2656
2657 if (err == EBUSY &&
2658 (array.state & (1<<MD_SB_BITMAP_PRESENT)))
2659 cont_err("Bitmap must be removed before shape can be changed\n");
2660
2661 goto release;
2662 }
2663 } else if (!restart) {
2664 /* set them all just in case some old 'new_*' value
2665 * persists from some earlier problem.
2666 */
2667 int err = 0;
2668 if (sysfs_set_num(sra, NULL, "chunk_size", info->new_chunk) < 0)
2669 err = errno;
2670 if (!err && sysfs_set_num(sra, NULL, "layout",
2671 reshape->after.layout) < 0)
2672 err = errno;
2673 if (!err && subarray_set_num(container, sra, "raid_disks",
2674 reshape->after.data_disks +
2675 reshape->parity) < 0)
2676 err = errno;
2677 if (err) {
2678 pr_err("Cannot set device shape for %s\n",
2679 devname);
2680
2681 if (err == EBUSY &&
2682 (array.state & (1<<MD_SB_BITMAP_PRESENT)))
2683 cont_err("Bitmap must be removed before shape can be changed\n");
2684 goto release;
2685 }
2686 }
2687 return 0;
2688 release:
2689 return -1;
2690 }
2691
2692 static int impose_level(int fd, int level, char *devname, int verbose)
2693 {
2694 char *c;
2695 struct mdu_array_info_s array;
2696 struct mdinfo info;
2697 sysfs_init(&info, fd, NULL);
2698
2699 ioctl(fd, GET_ARRAY_INFO, &array);
2700 if (level == 0 &&
2701 (array.level >= 4 && array.level <= 6)) {
2702 /* To convert to RAID0 we need to fail and
2703 * remove any non-data devices. */
2704 int found = 0;
2705 int d;
2706 int data_disks = array.raid_disks - 1;
2707 if (array.level == 6)
2708 data_disks -= 1;
2709 if (array.level == 5 &&
2710 array.layout != ALGORITHM_PARITY_N)
2711 return -1;
2712 if (array.level == 6 &&
2713 array.layout != ALGORITHM_PARITY_N_6)
2714 return -1;
2715 sysfs_set_str(&info, NULL,"sync_action", "idle");
2716 /* First remove any spares so no recovery starts */
2717 for (d = 0, found = 0;
2718 d < MAX_DISKS && found < array.nr_disks;
2719 d++) {
2720 mdu_disk_info_t disk;
2721 disk.number = d;
2722 if (ioctl(fd, GET_DISK_INFO, &disk) < 0)
2723 continue;
2724 if (disk.major == 0 && disk.minor == 0)
2725 continue;
2726 found++;
2727 if ((disk.state & (1 << MD_DISK_ACTIVE))
2728 && disk.raid_disk < data_disks)
2729 /* keep this */
2730 continue;
2731 ioctl(fd, HOT_REMOVE_DISK,
2732 makedev(disk.major, disk.minor));
2733 }
2734 /* Now fail anything left */
2735 ioctl(fd, GET_ARRAY_INFO, &array);
2736 for (d = 0, found = 0;
2737 d < MAX_DISKS && found < array.nr_disks;
2738 d++) {
2739 mdu_disk_info_t disk;
2740 disk.number = d;
2741 if (ioctl(fd, GET_DISK_INFO, &disk) < 0)
2742 continue;
2743 if (disk.major == 0 && disk.minor == 0)
2744 continue;
2745 found++;
2746 if ((disk.state & (1 << MD_DISK_ACTIVE))
2747 && disk.raid_disk < data_disks)
2748 /* keep this */
2749 continue;
2750 ioctl(fd, SET_DISK_FAULTY,
2751 makedev(disk.major, disk.minor));
2752 hot_remove_disk(fd, makedev(disk.major, disk.minor));
2753 }
2754 }
2755 c = map_num(pers, level);
2756 if (c) {
2757 int err = sysfs_set_str(&info, NULL, "level", c);
2758 if (err) {
2759 err = errno;
2760 pr_err("%s: could not set level to %s\n",
2761 devname, c);
2762 if (err == EBUSY &&
2763 (array.state & (1<<MD_SB_BITMAP_PRESENT)))
2764 cont_err("Bitmap must be removed before level can be changed\n");
2765 return err;
2766 }
2767 if (verbose >= 0)
2768 pr_err("level of %s changed to %s\n",
2769 devname, c);
2770 }
2771 return 0;
2772 }
2773
2774 int sigterm = 0;
2775 static void catch_term(int sig)
2776 {
2777 sigterm = 1;
2778 }
2779
2780 static int continue_via_systemd(char *devnm)
2781 {
2782 int skipped, i, pid, status;
2783 char pathbuf[1024];
2784 /* In a systemd/udev world, it is best to get systemd to
2785 * run "mdadm --grow --continue" rather than running in the
2786 * background.
2787 */
2788 switch(fork()) {
2789 case 0:
2790 /* FIXME yuk. CLOSE_EXEC?? */
2791 skipped = 0;
2792 for (i = 3; skipped < 20; i++)
2793 if (close(i) < 0)
2794 skipped++;
2795 else
2796 skipped = 0;
2797
2798 /* Don't want to see error messages from
2799 * systemctl. If the service doesn't exist,
2800 * we fork ourselves.
2801 */
2802 close(2);
2803 open("/dev/null", O_WRONLY);
2804 snprintf(pathbuf, sizeof(pathbuf), "mdadm-grow-continue@%s.service",
2805 devnm);
2806 status = execl("/usr/bin/systemctl", "systemctl",
2807 "start",
2808 pathbuf, NULL);
2809 status = execl("/bin/systemctl", "systemctl", "start",
2810 pathbuf, NULL);
2811 exit(1);
2812 case -1: /* Just do it ourselves. */
2813 break;
2814 default: /* parent - good */
2815 pid = wait(&status);
2816 if (pid >= 0 && status == 0)
2817 return 1;
2818 }
2819 return 0;
2820 }
2821
2822 static int reshape_array(char *container, int fd, char *devname,
2823 struct supertype *st, struct mdinfo *info,
2824 int force, struct mddev_dev *devlist,
2825 unsigned long long data_offset,
2826 char *backup_file, int verbose, int forked,
2827 int restart, int freeze_reshape)
2828 {
2829 struct reshape reshape;
2830 int spares_needed;
2831 char *msg;
2832 int orig_level = UnSet;
2833 int odisks;
2834 int delayed;
2835
2836 struct mdu_array_info_s array;
2837 char *c;
2838
2839 struct mddev_dev *dv;
2840 int added_disks;
2841
2842 int *fdlist = NULL;
2843 unsigned long long *offsets = NULL;
2844 int d;
2845 int nrdisks;
2846 int err;
2847 unsigned long blocks;
2848 unsigned long long array_size;
2849 int done;
2850 struct mdinfo *sra = NULL;
2851 char buf[20];
2852
2853 /* when reshaping a RAID0, the component_size might be zero.
2854 * So try to fix that up.
2855 */
2856 if (ioctl(fd, GET_ARRAY_INFO, &array) != 0) {
2857 dprintf("Cannot get array information.\n");
2858 goto release;
2859 }
2860 if (array.level == 0 && info->component_size == 0) {
2861 get_dev_size(fd, NULL, &array_size);
2862 info->component_size = array_size / array.raid_disks;
2863 }
2864
2865 if (array.level == 10)
2866 /* Need space_after info */
2867 get_space_after(fd, st, info);
2868
2869 if (info->reshape_active) {
2870 int new_level = info->new_level;
2871 info->new_level = UnSet;
2872 if (info->delta_disks > 0)
2873 info->array.raid_disks -= info->delta_disks;
2874 msg = analyse_change(devname, info, &reshape);
2875 info->new_level = new_level;
2876 if (info->delta_disks > 0)
2877 info->array.raid_disks += info->delta_disks;
2878 if (!restart)
2879 /* Make sure the array isn't read-only */
2880 ioctl(fd, RESTART_ARRAY_RW, 0);
2881 } else
2882 msg = analyse_change(devname, info, &reshape);
2883 if (msg) {
2884 /* if msg == "", error has already been printed */
2885 if (msg[0])
2886 pr_err("%s\n", msg);
2887 goto release;
2888 }
2889 if (restart &&
2890 (reshape.level != info->array.level ||
2891 reshape.before.layout != info->array.layout ||
2892 reshape.before.data_disks + reshape.parity
2893 != info->array.raid_disks - max(0, info->delta_disks))) {
2894 pr_err("reshape info is not in native format - cannot continue.\n");
2895 goto release;
2896 }
2897
2898 if (st->ss->external && restart && (info->reshape_progress == 0) &&
2899 !((sysfs_get_str(info, NULL, "sync_action", buf, sizeof(buf)) > 0) &&
2900 (strncmp(buf, "reshape", 7) == 0))) {
2901 /* When reshape is restarted from '0', very begin of array
2902 * it is possible that for external metadata reshape and array
2903 * configuration doesn't happen.
2904 * Check if md has the same opinion, and reshape is restarted
2905 * from 0. If so, this is regular reshape start after reshape
2906 * switch in metadata to next array only.
2907 */
2908 if ((verify_reshape_position(info, reshape.level) >= 0) &&
2909 (info->reshape_progress == 0))
2910 restart = 0;
2911 }
2912 if (restart) {
2913 /* reshape already started. just skip to monitoring the reshape */
2914 if (reshape.backup_blocks == 0)
2915 return 0;
2916 if (restart & RESHAPE_NO_BACKUP)
2917 return 0;
2918
2919 /* Need 'sra' down at 'started:' */
2920 sra = sysfs_read(fd, NULL,
2921 GET_COMPONENT|GET_DEVS|GET_OFFSET|GET_STATE|GET_CHUNK|
2922 GET_CACHE);
2923 if (!sra) {
2924 pr_err("%s: Cannot get array details from sysfs\n",
2925 devname);
2926 goto release;
2927 }
2928
2929 if (!backup_file)
2930 backup_file = locate_backup(sra->sys_name);
2931
2932 goto started;
2933 }
2934 /* The container is frozen but the array may not be.
2935 * So freeze the array so spares don't get put to the wrong use
2936 * FIXME there should probably be a cleaner separation between
2937 * freeze_array and freeze_container.
2938 */
2939 sysfs_freeze_array(info);
2940 /* Check we have enough spares to not be degraded */
2941 added_disks = 0;
2942 for (dv = devlist; dv ; dv=dv->next)
2943 added_disks++;
2944 spares_needed = max(reshape.before.data_disks,
2945 reshape.after.data_disks)
2946 + reshape.parity - array.raid_disks;
2947
2948 if (!force &&
2949 info->new_level > 1 && info->array.level > 1 &&
2950 spares_needed > info->array.spare_disks + added_disks) {
2951 pr_err("Need %d spare%s to avoid degraded array, and only have %d.\n"
2952 " Use --force to over-ride this check.\n",
2953 spares_needed,
2954 spares_needed == 1 ? "" : "s",
2955 info->array.spare_disks + added_disks);
2956 goto release;
2957 }
2958 /* Check we have enough spares to not fail */
2959 spares_needed = max(reshape.before.data_disks,
2960 reshape.after.data_disks)
2961 - array.raid_disks;
2962 if ((info->new_level > 1 || info->new_level == 0) &&
2963 spares_needed > info->array.spare_disks +added_disks) {
2964 pr_err("Need %d spare%s to create working array, and only have %d.\n",
2965 spares_needed,
2966 spares_needed == 1 ? "" : "s",
2967 info->array.spare_disks + added_disks);
2968 goto release;
2969 }
2970
2971 if (reshape.level != array.level) {
2972 int err = impose_level(fd, reshape.level, devname, verbose);
2973 if (err)
2974 goto release;
2975 info->new_layout = UnSet; /* after level change,
2976 * layout is meaningless */
2977 orig_level = array.level;
2978 sysfs_freeze_array(info);
2979
2980 if (reshape.level > 0 && st->ss->external) {
2981 /* make sure mdmon is aware of the new level */
2982 if (mdmon_running(container))
2983 flush_mdmon(container);
2984
2985 if (!mdmon_running(container))
2986 start_mdmon(container);
2987 ping_monitor(container);
2988 if (mdmon_running(container) &&
2989 st->update_tail == NULL)
2990 st->update_tail = &st->updates;
2991 }
2992 }
2993 /* ->reshape_super might have chosen some spares from the
2994 * container that it wants to be part of the new array.
2995 * We can collect them with ->container_content and give
2996 * them to the kernel.
2997 */
2998 if (st->ss->reshape_super && st->ss->container_content) {
2999 char *subarray = strchr(info->text_version+1, '/')+1;
3000 struct mdinfo *info2 =
3001 st->ss->container_content(st, subarray);
3002 struct mdinfo *d;
3003
3004 if (info2) {
3005 sysfs_init(info2, fd, st->devnm);
3006 /* When increasing number of devices, we need to set
3007 * new raid_disks before adding these, or they might
3008 * be rejected.
3009 */
3010 if (reshape.backup_blocks &&
3011 reshape.after.data_disks > reshape.before.data_disks)
3012 subarray_set_num(container, info2, "raid_disks",
3013 reshape.after.data_disks +
3014 reshape.parity);
3015 for (d = info2->devs; d; d = d->next) {
3016 if (d->disk.state == 0 &&
3017 d->disk.raid_disk >= 0) {
3018 /* This is a spare that wants to
3019 * be part of the array.
3020 */
3021 add_disk(fd, st, info2, d);
3022 }
3023 }
3024 sysfs_free(info2);
3025 }
3026 }
3027 /* We might have been given some devices to add to the
3028 * array. Now that the array has been changed to the right
3029 * level and frozen, we can safely add them.
3030 */
3031 if (devlist) {
3032 if (Manage_subdevs(devname, fd, devlist, verbose,
3033 0, NULL, 0))
3034 goto release;
3035 }
3036
3037 if (reshape.backup_blocks == 0 && data_offset != INVALID_SECTORS)
3038 reshape.backup_blocks = reshape.before.data_disks * info->array.chunk_size/512;
3039 if (reshape.backup_blocks == 0) {
3040 /* No restriping needed, but we might need to impose
3041 * some more changes: layout, raid_disks, chunk_size
3042 */
3043 /* read current array info */
3044 if (ioctl(fd, GET_ARRAY_INFO, &array) != 0) {
3045 dprintf("Cannot get array information.\n");
3046 goto release;
3047 }
3048 /* compare current array info with new values and if
3049 * it is different update them to new */
3050 if (info->new_layout != UnSet &&
3051 info->new_layout != array.layout) {
3052 array.layout = info->new_layout;
3053 if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
3054 pr_err("failed to set new layout\n");
3055 goto release;
3056 } else if (verbose >= 0)
3057 printf("layout for %s set to %d\n",
3058 devname, array.layout);
3059 }
3060 if (info->delta_disks != UnSet &&
3061 info->delta_disks != 0 &&
3062 array.raid_disks != (info->array.raid_disks + info->delta_disks)) {
3063 array.raid_disks += info->delta_disks;
3064 if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
3065 pr_err("failed to set raid disks\n");
3066 goto release;
3067 } else if (verbose >= 0) {
3068 printf("raid_disks for %s set to %d\n",
3069 devname, array.raid_disks);
3070 }
3071 }
3072 if (info->new_chunk != 0 &&
3073 info->new_chunk != array.chunk_size) {
3074 if (sysfs_set_num(info, NULL,
3075 "chunk_size", info->new_chunk) != 0) {
3076 pr_err("failed to set chunk size\n");
3077 goto release;
3078 } else if (verbose >= 0)
3079 printf("chunk size for %s set to %d\n",
3080 devname, array.chunk_size);
3081 }
3082 unfreeze(st);
3083 return 0;
3084 }
3085
3086 /*
3087 * There are three possibilities.
3088 * 1/ The array will shrink.
3089 * We need to ensure the reshape will pause before reaching
3090 * the 'critical section'. We also need to fork and wait for
3091 * that to happen. When it does we
3092 * suspend/backup/complete/unfreeze
3093 *
3094 * 2/ The array will not change size.
3095 * This requires that we keep a backup of a sliding window
3096 * so that we can restore data after a crash. So we need
3097 * to fork and monitor progress.
3098 * In future we will allow the data_offset to change, so
3099 * a sliding backup becomes unnecessary.
3100 *
3101 * 3/ The array will grow. This is relatively easy.
3102 * However the kernel's restripe routines will cheerfully
3103 * overwrite some early data before it is safe. So we
3104 * need to make a backup of the early parts of the array
3105 * and be ready to restore it if rebuild aborts very early.
3106 * For externally managed metadata, we still need a forked
3107 * child to monitor the reshape and suspend IO over the region
3108 * that is being reshaped.
3109 *
3110 * We backup data by writing it to one spare, or to a
3111 * file which was given on command line.
3112 *
3113 * In each case, we first make sure that storage is available
3114 * for the required backup.
3115 * Then we:
3116 * - request the shape change.
3117 * - fork to handle backup etc.
3118 */
3119 /* Check that we can hold all the data */
3120 get_dev_size(fd, NULL, &array_size);
3121 if (reshape.new_size < (array_size/512)) {
3122 pr_err("this change will reduce the size of the array.\n"
3123 " use --grow --array-size first to truncate array.\n"
3124 " e.g. mdadm --grow %s --array-size %llu\n",
3125 devname, reshape.new_size/2);
3126 goto release;
3127 }
3128
3129 if (array.level == 10) {
3130 /* Reshaping RAID10 does not require any data backup by
3131 * user-space. Instead it requires that the data_offset
3132 * is changed to avoid the need for backup.
3133 * So this is handled very separately
3134 */
3135 if (restart)
3136 /* Nothing to do. */
3137 return 0;
3138 return raid10_reshape(container, fd, devname, st, info,
3139 &reshape, data_offset,
3140 force, verbose);
3141 }
3142 sra = sysfs_read(fd, NULL,
3143 GET_COMPONENT|GET_DEVS|GET_OFFSET|GET_STATE|GET_CHUNK|
3144 GET_CACHE);
3145 if (!sra) {
3146 pr_err("%s: Cannot get array details from sysfs\n",
3147 devname);
3148 goto release;
3149 }
3150
3151 if (!backup_file)
3152 switch(set_new_data_offset(sra, st, devname,
3153 reshape.after.data_disks - reshape.before.data_disks,
3154 data_offset,
3155 reshape.min_offset_change, 1)) {
3156 case -1:
3157 goto release;
3158 case 0:
3159 /* Updated data_offset, so it's easy now */
3160 update_cache_size(container, sra, info,
3161 min(reshape.before.data_disks,
3162 reshape.after.data_disks),
3163 reshape.backup_blocks);
3164
3165 /* Right, everything seems fine. Let's kick things off.
3166 */
3167 sync_metadata(st);
3168
3169 if (impose_reshape(sra, info, st, fd, restart,
3170 devname, container, &reshape) < 0)
3171 goto release;
3172 if (sysfs_set_str(sra, NULL, "sync_action", "reshape") < 0) {
3173 struct mdinfo *sd;
3174 if (errno != EINVAL) {
3175 pr_err("Failed to initiate reshape!\n");
3176 goto release;
3177 }
3178 /* revert data_offset and try the old way */
3179 for (sd = sra->devs; sd; sd = sd->next) {
3180 sysfs_set_num(sra, sd, "new_offset",
3181 sd->data_offset);
3182 sysfs_set_str(sra, NULL, "reshape_direction",
3183 "forwards");
3184 }
3185 break;
3186 }
3187 if (info->new_level == reshape.level)
3188 return 0;
3189 /* need to adjust level when reshape completes */
3190 switch(fork()) {
3191 case -1: /* ignore error, but don't wait */
3192 return 0;
3193 default: /* parent */
3194 return 0;
3195 case 0:
3196 map_fork();
3197 break;
3198 }
3199 close(fd);
3200 wait_reshape(sra);
3201 fd = open_dev(sra->sys_name);
3202 if (fd >= 0)
3203 impose_level(fd, info->new_level, devname, verbose);
3204 return 0;
3205 case 1: /* Couldn't set data_offset, try the old way */
3206 if (data_offset != INVALID_SECTORS) {
3207 pr_err("Cannot update data_offset on this array\n");
3208 goto release;
3209 }
3210 break;
3211 }
3212
3213 started:
3214 /* Decide how many blocks (sectors) for a reshape
3215 * unit. The number we have so far is just a minimum
3216 */
3217 blocks = reshape.backup_blocks;
3218 if (reshape.before.data_disks ==
3219 reshape.after.data_disks) {
3220 /* Make 'blocks' bigger for better throughput, but
3221 * not so big that we reject it below.
3222 * Try for 16 megabytes
3223 */
3224 while (blocks * 32 < sra->component_size &&
3225 blocks < 16*1024*2)
3226 blocks *= 2;
3227 } else
3228 pr_err("Need to backup %luK of critical section..\n", blocks/2);
3229
3230 if (blocks >= sra->component_size/2) {
3231 pr_err("%s: Something wrong - reshape aborted\n",
3232 devname);
3233 goto release;
3234 }
3235
3236 /* Now we need to open all these devices so we can read/write.
3237 */
3238 nrdisks = max(reshape.before.data_disks,
3239 reshape.after.data_disks) + reshape.parity
3240 + sra->array.spare_disks;
3241 fdlist = xcalloc((1+nrdisks), sizeof(int));
3242 offsets = xcalloc((1+nrdisks), sizeof(offsets[0]));
3243
3244 odisks = reshape.before.data_disks + reshape.parity;
3245 d = reshape_prepare_fdlist(devname, sra, odisks,
3246 nrdisks, blocks, backup_file,
3247 fdlist, offsets);
3248 if (d < odisks) {
3249 goto release;
3250 }
3251 if ((st->ss->manage_reshape == NULL) ||
3252 (st->ss->recover_backup == NULL)) {
3253 if (backup_file == NULL) {
3254 if (reshape.after.data_disks <=
3255 reshape.before.data_disks) {
3256 pr_err("%s: Cannot grow - need backup-file\n",
3257 devname);
3258 pr_err(" Please provide one with \"--backup=...\"\n");
3259 goto release;
3260 } else if (d == odisks) {
3261 pr_err("%s: Cannot grow - need a spare or backup-file to backup critical section\n", devname);
3262 goto release;
3263 }
3264 } else {
3265 if (!reshape_open_backup_file(backup_file, fd, devname,
3266 (signed)blocks,
3267 fdlist+d, offsets+d,
3268 sra->sys_name,
3269 restart)) {
3270 goto release;
3271 }
3272 d++;
3273 }
3274 }
3275
3276 update_cache_size(container, sra, info,
3277 min(reshape.before.data_disks, reshape.after.data_disks),
3278 blocks);
3279
3280 /* Right, everything seems fine. Let's kick things off.
3281 * If only changing raid_disks, use ioctl, else use
3282 * sysfs.
3283 */
3284 sync_metadata(st);
3285
3286 if (impose_reshape(sra, info, st, fd, restart,
3287 devname, container, &reshape) < 0)
3288 goto release;
3289
3290 err = start_reshape(sra, restart, reshape.before.data_disks,
3291 reshape.after.data_disks);
3292 if (err) {
3293 pr_err("Cannot %s reshape for %s\n",
3294 restart ? "continue" : "start",
3295 devname);
3296 goto release;
3297 }
3298 if (restart)
3299 sysfs_set_str(sra, NULL, "array_state", "active");
3300 if (freeze_reshape) {
3301 free(fdlist);
3302 free(offsets);
3303 sysfs_free(sra);
3304 pr_err("Reshape has to be continued from location %llu when root filesystem has been mounted.\n",
3305 sra->reshape_progress);
3306 return 1;
3307 }
3308
3309 if (!forked && !check_env("MDADM_NO_SYSTEMCTL"))
3310 if (continue_via_systemd(container ?: sra->sys_name)) {
3311 free(fdlist);
3312 free(offsets);
3313 sysfs_free(sra);
3314 return 0;
3315 }
3316
3317 /* Now we just need to kick off the reshape and watch, while
3318 * handling backups of the data...
3319 * This is all done by a forked background process.
3320 */
3321 switch(forked ? 0 : fork()) {
3322 case -1:
3323 pr_err("Cannot run child to monitor reshape: %s\n",
3324 strerror(errno));
3325 abort_reshape(sra);
3326 goto release;
3327 default:
3328 free(fdlist);
3329 free(offsets);
3330 sysfs_free(sra);
3331 return 0;
3332 case 0:
3333 map_fork();
3334 break;
3335 }
3336
3337 /* If another array on the same devices is busy, the
3338 * reshape will wait for them. This would mean that
3339 * the first section that we suspend will stay suspended
3340 * for a long time. So check on that possibility
3341 * by looking for "DELAYED" in /proc/mdstat, and if found,
3342 * wait a while
3343 */
3344 do {
3345 struct mdstat_ent *mds, *m;
3346 delayed = 0;
3347 mds = mdstat_read(1, 0);
3348 for (m = mds; m; m = m->next)
3349 if (strcmp(m->devnm, sra->sys_name) == 0) {
3350 if (m->resync &&
3351 m->percent == RESYNC_DELAYED)
3352 delayed = 1;
3353 if (m->resync == 0)
3354 /* Haven't started the reshape thread
3355 * yet, wait a bit
3356 */
3357 delayed = 2;
3358 break;
3359 }
3360 free_mdstat(mds);
3361 if (delayed == 1 && get_linux_version() < 3007000) {
3362 pr_err("Reshape is delayed, but cannot wait carefully with this kernel.\n"
3363 " You might experience problems until other reshapes complete.\n");
3364 delayed = 0;
3365 }
3366 if (delayed)
3367 mdstat_wait(30 - (delayed-1) * 25);
3368 } while (delayed);
3369 mdstat_close();
3370 close(fd);
3371 if (check_env("MDADM_GROW_VERIFY"))
3372 fd = open(devname, O_RDONLY | O_DIRECT);
3373 else
3374 fd = -1;
3375 mlockall(MCL_FUTURE);
3376
3377 signal(SIGTERM, catch_term);
3378
3379 if (st->ss->external) {
3380 /* metadata handler takes it from here */
3381 done = st->ss->manage_reshape(
3382 fd, sra, &reshape, st, blocks,
3383 fdlist, offsets,
3384 d - odisks, fdlist+odisks,
3385 offsets+odisks);
3386 } else
3387 done = child_monitor(
3388 fd, sra, &reshape, st, blocks,
3389 fdlist, offsets,
3390 d - odisks, fdlist+odisks,
3391 offsets+odisks);
3392
3393 free(fdlist);
3394 free(offsets);
3395
3396 if (backup_file && done) {
3397 char *bul;
3398 bul = make_backup(sra->sys_name);
3399 if (bul) {
3400 char buf[1024];
3401 int l = readlink(bul, buf, sizeof(buf) - 1);
3402 if (l > 0) {
3403 buf[l]=0;
3404 unlink(buf);
3405 }
3406 unlink(bul);
3407 free(bul);
3408 }
3409 unlink(backup_file);
3410 }
3411 if (!done) {
3412 abort_reshape(sra);
3413 goto out;
3414 }
3415
3416 if (!st->ss->external &&
3417 !(reshape.before.data_disks != reshape.after.data_disks
3418 && info->custom_array_size) &&
3419 info->new_level == reshape.level &&
3420 !forked) {
3421 /* no need to wait for the reshape to finish as
3422 * there is nothing more to do.
3423 */
3424 sysfs_free(sra);
3425 exit(0);
3426 }
3427 wait_reshape(sra);
3428
3429 if (st->ss->external) {
3430 /* Re-load the metadata as much could have changed */
3431 int cfd = open_dev(st->container_devnm);
3432 if (cfd >= 0) {
3433 flush_mdmon(container);
3434 st->ss->free_super(st);
3435 st->ss->load_container(st, cfd, container);
3436 close(cfd);
3437 }
3438 }
3439
3440 /* set new array size if required customer_array_size is used
3441 * by this metadata.
3442 */
3443 if (reshape.before.data_disks !=
3444 reshape.after.data_disks &&
3445 info->custom_array_size)
3446 set_array_size(st, info, info->text_version);
3447
3448 if (info->new_level != reshape.level) {
3449 if (fd < 0)
3450 fd = open(devname, O_RDONLY);
3451 impose_level(fd, info->new_level, devname, verbose);
3452 close(fd);
3453 if (info->new_level == 0)
3454 st->update_tail = NULL;
3455 }
3456 out:
3457 sysfs_free(sra);
3458 if (forked)
3459 return 0;
3460 unfreeze(st);
3461 exit(0);
3462
3463 release:
3464 free(fdlist);
3465 free(offsets);
3466 if (orig_level != UnSet && sra) {
3467 c = map_num(pers, orig_level);
3468 if (c && sysfs_set_str(sra, NULL, "level", c) == 0)
3469 pr_err("aborting level change\n");
3470 }
3471 sysfs_free(sra);
3472 if (!forked)
3473 unfreeze(st);
3474 return 1;
3475 }
3476
3477 /* mdfd handle is passed to be closed in child process (after fork).
3478 */
3479 int reshape_container(char *container, char *devname,
3480 int mdfd,
3481 struct supertype *st,
3482 struct mdinfo *info,
3483 int force,
3484 char *backup_file, int verbose,
3485 int forked, int restart, int freeze_reshape)
3486 {
3487 struct mdinfo *cc = NULL;
3488 int rv = restart;
3489 char last_devnm[32] = "";
3490
3491 /* component_size is not meaningful for a container,
3492 * so pass '0' meaning 'no change'
3493 */
3494 if (!restart &&
3495 reshape_super(st, 0, info->new_level,
3496 info->new_layout, info->new_chunk,
3497 info->array.raid_disks, info->delta_disks,
3498 backup_file, devname, APPLY_METADATA_CHANGES,
3499 verbose)) {
3500 unfreeze(st);
3501 return 1;
3502 }
3503
3504 sync_metadata(st);
3505
3506 /* ping monitor to be sure that update is on disk
3507 */
3508 ping_monitor(container);
3509
3510 if (!forked && !freeze_reshape && !check_env("MDADM_NO_SYSTEMCTL"))
3511 if (continue_via_systemd(container))
3512 return 0;
3513
3514 switch (forked ? 0 : fork()) {
3515 case -1: /* error */
3516 perror("Cannot fork to complete reshape\n");
3517 unfreeze(st);
3518 return 1;
3519 default: /* parent */
3520 if (!freeze_reshape)
3521 printf("%s: multi-array reshape continues in background\n", Name);
3522 return 0;
3523 case 0: /* child */
3524 map_fork();
3525 break;
3526 }
3527
3528 /* close unused handle in child process
3529 */
3530 if (mdfd > -1)
3531 close(mdfd);
3532
3533 while(1) {
3534 /* For each member array with reshape_active,
3535 * we need to perform the reshape.
3536 * We pick the first array that needs reshaping and
3537 * reshape it. reshape_array() will re-read the metadata
3538 * so the next time through a different array should be
3539 * ready for reshape.
3540 * It is possible that the 'different' array will not
3541 * be assembled yet. In that case we simple exit.
3542 * When it is assembled, the mdadm which assembles it
3543 * will take over the reshape.
3544 */
3545 struct mdinfo *content;
3546 int fd;
3547 struct mdstat_ent *mdstat;
3548 char *adev;
3549 dev_t devid;
3550
3551 sysfs_free(cc);
3552
3553 cc = st->ss->container_content(st, NULL);
3554
3555 for (content = cc; content ; content = content->next) {
3556 char *subarray;
3557 if (!content->reshape_active)
3558 continue;
3559
3560 subarray = strchr(content->text_version+1, '/')+1;
3561 mdstat = mdstat_by_subdev(subarray, container);
3562 if (!mdstat)
3563 continue;
3564 if (mdstat->active == 0) {
3565 pr_err("Skipping inactive array %s.\n",
3566 mdstat->devnm);
3567 free_mdstat(mdstat);
3568 mdstat = NULL;
3569 continue;
3570 }
3571 break;
3572 }
3573 if (!content)
3574 break;
3575
3576 devid = devnm2devid(mdstat->devnm);
3577 adev = map_dev(major(devid), minor(devid), 0);
3578 if (!adev)
3579 adev = content->text_version;
3580
3581 fd = open_dev(mdstat->devnm);
3582 if (fd < 0) {
3583 pr_err("Device %s cannot be opened for reshape.\n", adev);
3584 break;
3585 }
3586
3587 if (strcmp(last_devnm, mdstat->devnm) == 0) {
3588 /* Do not allow for multiple reshape_array() calls for
3589 * the same array.
3590 * It can happen when reshape_array() returns without
3591 * error, when reshape is not finished (wrong reshape
3592 * starting/continuation conditions). Mdmon doesn't
3593 * switch to next array in container and reentry
3594 * conditions for the same array occur.
3595 * This is possibly interim until the behaviour of
3596 * reshape_array is resolved().
3597 */
3598 printf("%s: Multiple reshape execution detected for device %s.\n", Name, adev);
3599 close(fd);
3600 break;
3601 }
3602 strcpy(last_devnm, mdstat->devnm);
3603
3604 sysfs_init(content, fd, mdstat->devnm);
3605
3606 if (mdmon_running(container))
3607 flush_mdmon(container);
3608
3609 rv = reshape_array(container, fd, adev, st,
3610 content, force, NULL, INVALID_SECTORS,
3611 backup_file, verbose, 1, restart,
3612 freeze_reshape);
3613 close(fd);
3614
3615 if (freeze_reshape) {
3616 sysfs_free(cc);
3617 exit(0);
3618 }
3619
3620 restart = 0;
3621 if (rv)
3622 break;
3623
3624 if (mdmon_running(container))
3625 flush_mdmon(container);
3626 }
3627 if (!rv)
3628 unfreeze(st);
3629 sysfs_free(cc);
3630 exit(0);
3631 }
3632
3633 /*
3634 * We run a child process in the background which performs the following
3635 * steps:
3636 * - wait for resync to reach a certain point
3637 * - suspend io to the following section
3638 * - backup that section
3639 * - allow resync to proceed further
3640 * - resume io
3641 * - discard the backup.
3642 *
3643 * When are combined in slightly different ways in the three cases.
3644 * Grow:
3645 * - suspend/backup/allow/wait/resume/discard
3646 * Shrink:
3647 * - allow/wait/suspend/backup/allow/wait/resume/discard
3648 * same-size:
3649 * - wait/resume/discard/suspend/backup/allow
3650 *
3651 * suspend/backup/allow always come together
3652 * wait/resume/discard do too.
3653 * For the same-size case we have two backups to improve flow.
3654 *
3655 */
3656
3657 int progress_reshape(struct mdinfo *info, struct reshape *reshape,
3658 unsigned long long backup_point,
3659 unsigned long long wait_point,
3660 unsigned long long *suspend_point,
3661 unsigned long long *reshape_completed, int *frozen)
3662 {
3663 /* This function is called repeatedly by the reshape manager.
3664 * It determines how much progress can safely be made and allows
3665 * that progress.
3666 * - 'info' identifies the array and particularly records in
3667 * ->reshape_progress the metadata's knowledge of progress
3668 * This is a sector offset from the start of the array
3669 * of the next array block to be relocated. This number
3670 * may increase from 0 or decrease from array_size, depending
3671 * on the type of reshape that is happening.
3672 * Note that in contrast, 'sync_completed' is a block count of the
3673 * reshape so far. It gives the distance between the start point
3674 * (head or tail of device) and the next place that data will be
3675 * written. It always increases.
3676 * - 'reshape' is the structure created by analyse_change
3677 * - 'backup_point' shows how much the metadata manager has backed-up
3678 * data. For reshapes with increasing progress, it is the next address
3679 * to be backed up, previous addresses have been backed-up. For
3680 * decreasing progress, it is the earliest address that has been
3681 * backed up - later address are also backed up.
3682 * So addresses between reshape_progress and backup_point are
3683 * backed up providing those are in the 'correct' order.
3684 * - 'wait_point' is an array address. When reshape_completed
3685 * passes this point, progress_reshape should return. It might
3686 * return earlier if it determines that ->reshape_progress needs
3687 * to be updated or further backup is needed.
3688 * - suspend_point is maintained by progress_reshape and the caller
3689 * should not touch it except to initialise to zero.
3690 * It is an array address and it only increases in 2.6.37 and earlier.
3691 * This makes it difficult to handle reducing reshapes with
3692 * external metadata.
3693 * However: it is similar to backup_point in that it records the
3694 * other end of a suspended region from reshape_progress.
3695 * it is moved to extend the region that is safe to backup and/or
3696 * reshape
3697 * - reshape_completed is read from sysfs and returned. The caller
3698 * should copy this into ->reshape_progress when it has reason to
3699 * believe that the metadata knows this, and any backup outside this
3700 * has been erased.
3701 *
3702 * Return value is:
3703 * 1 if more data from backup_point - but only as far as suspend_point,
3704 * should be backed up
3705 * 0 if things are progressing smoothly
3706 * -1 if the reshape is finished because it is all done,
3707 * -2 if the reshape is finished due to an error.
3708 */
3709
3710 int advancing = (reshape->after.data_disks
3711 >= reshape->before.data_disks);
3712 unsigned long long need_backup; /* All data between start of array and
3713 * here will at some point need to
3714 * be backed up.
3715 */
3716 unsigned long long read_offset, write_offset;
3717 unsigned long long write_range;
3718 unsigned long long max_progress, target, completed;
3719 unsigned long long array_size = (info->component_size
3720 * reshape->before.data_disks);
3721 int fd;
3722 char buf[20];
3723
3724 /* First, we unsuspend any region that is now known to be safe.
3725 * If suspend_point is on the 'wrong' side of reshape_progress, then
3726 * we don't have or need suspension at the moment. This is true for
3727 * native metadata when we don't need to back-up.
3728 */
3729 if (advancing) {
3730 if (info->reshape_progress <= *suspend_point)
3731 sysfs_set_num(info, NULL, "suspend_lo",
3732 info->reshape_progress);
3733 } else {
3734 /* Note: this won't work in 2.6.37 and before.
3735 * Something somewhere should make sure we don't need it!
3736 */
3737 if (info->reshape_progress >= *suspend_point)
3738 sysfs_set_num(info, NULL, "suspend_hi",
3739 info->reshape_progress);
3740 }
3741
3742 /* Now work out how far it is safe to progress.
3743 * If the read_offset for ->reshape_progress is less than
3744 * 'blocks' beyond the write_offset, we can only progress as far
3745 * as a backup.
3746 * Otherwise we can progress until the write_offset for the new location
3747 * reaches (within 'blocks' of) the read_offset at the current location.
3748 * However that region must be suspended unless we are using native
3749 * metadata.
3750 * If we need to suspend more, we limit it to 128M per device, which is
3751 * rather arbitrary and should be some time-based calculation.
3752 */
3753 read_offset = info->reshape_progress / reshape->before.data_disks;
3754 write_offset = info->reshape_progress / reshape->after.data_disks;
3755 write_range = info->new_chunk/512;
3756 if (reshape->before.data_disks == reshape->after.data_disks)
3757 need_backup = array_size;
3758 else
3759 need_backup = reshape->backup_blocks;
3760 if (advancing) {
3761 if (read_offset < write_offset + write_range)
3762 max_progress = backup_point;
3763 else
3764 max_progress =
3765 read_offset *
3766 reshape->after.data_disks;
3767 } else {
3768 if (read_offset > write_offset - write_range)
3769 /* Can only progress as far as has been backed up,
3770 * which must be suspended */
3771 max_progress = backup_point;
3772 else if (info->reshape_progress <= need_backup)
3773 max_progress = backup_point;
3774 else {
3775 if (info->array.major_version >= 0)
3776 /* Can progress until backup is needed */
3777 max_progress = need_backup;
3778 else {
3779 /* Can progress until metadata update is required */
3780 max_progress =
3781 read_offset *
3782 reshape->after.data_disks;
3783 /* but data must be suspended */
3784 if (max_progress < *suspend_point)
3785 max_progress = *suspend_point;
3786 }
3787 }
3788 }
3789
3790 /* We know it is safe to progress to 'max_progress' providing
3791 * it is suspended or we are using native metadata.
3792 * Consider extending suspend_point 128M per device if it
3793 * is less than 64M per device beyond reshape_progress.
3794 * But always do a multiple of 'blocks'
3795 * FIXME this is too big - it takes to long to complete
3796 * this much.
3797 */
3798 target = 64*1024*2 * min(reshape->before.data_disks,
3799 reshape->after.data_disks);
3800 target /= reshape->backup_blocks;
3801 if (target < 2)
3802 target = 2;
3803 target *= reshape->backup_blocks;
3804
3805 /* For externally managed metadata we always need to suspend IO to
3806 * the area being reshaped so we regularly push suspend_point forward.
3807 * For native metadata we only need the suspend if we are going to do
3808 * a backup.
3809 */
3810 if (advancing) {
3811 if ((need_backup > info->reshape_progress
3812 || info->array.major_version < 0) &&
3813 *suspend_point < info->reshape_progress + target) {
3814 if (need_backup < *suspend_point + 2 * target)
3815 *suspend_point = need_backup;
3816 else if (*suspend_point + 2 * target < array_size)
3817 *suspend_point += 2 * target;
3818 else
3819 *suspend_point = array_size;
3820 sysfs_set_num(info, NULL, "suspend_hi", *suspend_point);
3821 if (max_progress > *suspend_point)
3822 max_progress = *suspend_point;
3823 }
3824 } else {
3825 if (info->array.major_version >= 0) {
3826 /* Only need to suspend when about to backup */
3827 if (info->reshape_progress < need_backup * 2 &&
3828 *suspend_point > 0) {
3829 *suspend_point = 0;
3830 sysfs_set_num(info, NULL, "suspend_lo", 0);
3831 sysfs_set_num(info, NULL, "suspend_hi", need_backup);
3832 }
3833 } else {
3834 /* Need to suspend continually */
3835 if (info->reshape_progress < *suspend_point)
3836 *suspend_point = info->reshape_progress;
3837 if (*suspend_point + target < info->reshape_progress)
3838 /* No need to move suspend region yet */;
3839 else {
3840 if (*suspend_point >= 2 * target)
3841 *suspend_point -= 2 * target;
3842 else
3843 *suspend_point = 0;
3844 sysfs_set_num(info, NULL, "suspend_lo",
3845 *suspend_point);
3846 }
3847 if (max_progress < *suspend_point)
3848 max_progress = *suspend_point;
3849 }
3850 }
3851
3852 /* now set sync_max to allow that progress. sync_max, like
3853 * sync_completed is a count of sectors written per device, so
3854 * we find the difference between max_progress and the start point,
3855 * and divide that by after.data_disks to get a sync_max
3856 * number.
3857 * At the same time we convert wait_point to a similar number
3858 * for comparing against sync_completed.
3859 */
3860 /* scale down max_progress to per_disk */
3861 max_progress /= reshape->after.data_disks;
3862 /* Round to chunk size as some kernels give an erroneously high number */
3863 max_progress /= info->new_chunk/512;
3864 max_progress *= info->new_chunk/512;
3865 /* And round to old chunk size as the kernel wants that */
3866 max_progress /= info->array.chunk_size/512;
3867 max_progress *= info->array.chunk_size/512;
3868 /* Limit progress to the whole device */
3869 if (max_progress > info->component_size)
3870 max_progress = info->component_size;
3871 wait_point /= reshape->after.data_disks;
3872 if (!advancing) {
3873 /* switch from 'device offset' to 'processed block count' */
3874 max_progress = info->component_size - max_progress;
3875 wait_point = info->component_size - wait_point;
3876 }
3877
3878 if (!*frozen)
3879 sysfs_set_num(info, NULL, "sync_max", max_progress);
3880
3881 /* Now wait. If we have already reached the point that we were
3882 * asked to wait to, don't wait at all, else wait for any change.
3883 * We need to select on 'sync_completed' as that is the place that
3884 * notifications happen, but we are really interested in
3885 * 'reshape_position'
3886 */
3887 fd = sysfs_get_fd(info, NULL, "sync_completed");
3888 if (fd < 0)
3889 goto check_progress;
3890
3891 if (sysfs_fd_get_ll(fd, &completed) < 0)
3892 goto check_progress;
3893
3894 while (completed < max_progress && completed < wait_point) {
3895 /* Check that sync_action is still 'reshape' to avoid
3896 * waiting forever on a dead array
3897 */
3898 char action[20];
3899 if (sysfs_get_str(info, NULL, "sync_action",
3900 action, 20) <= 0 ||
3901 strncmp(action, "reshape", 7) != 0)
3902 break;
3903 /* Some kernels reset 'sync_completed' to zero
3904 * before setting 'sync_action' to 'idle'.
3905 * So we need these extra tests.
3906 */
3907 if (completed == 0 && advancing
3908 && strncmp(action, "idle", 4) == 0
3909 && info->reshape_progress > 0)
3910 break;
3911 if (completed == 0 && !advancing
3912 && strncmp(action, "idle", 4) == 0
3913 && info->reshape_progress < (info->component_size
3914 * reshape->after.data_disks))
3915 break;
3916 sysfs_wait(fd, NULL);
3917 if (sysfs_fd_get_ll(fd, &completed) < 0)
3918 goto check_progress;
3919 }
3920 /* Some kernels reset 'sync_completed' to zero,
3921 * we need to have real point we are in md.
3922 * So in that case, read 'reshape_position' from sysfs.
3923 */
3924 if (completed == 0) {
3925 unsigned long long reshapep;
3926 char action[20];
3927 if (sysfs_get_str(info, NULL, "sync_action",
3928 action, 20) > 0 &&
3929 strncmp(action, "idle", 4) == 0 &&
3930 sysfs_get_ll(info, NULL,
3931 "reshape_position", &reshapep) == 0)
3932 *reshape_completed = reshapep;
3933 } else {
3934 /* some kernels can give an incorrectly high
3935 * 'completed' number, so round down */
3936 completed /= (info->new_chunk/512);
3937 completed *= (info->new_chunk/512);
3938 /* Convert 'completed' back in to a 'progress' number */
3939 completed *= reshape->after.data_disks;
3940 if (!advancing)
3941 completed = (info->component_size
3942 * reshape->after.data_disks
3943 - completed);
3944 *reshape_completed = completed;
3945 }
3946
3947 close(fd);
3948
3949 /* We return the need_backup flag. Caller will decide
3950 * how much - a multiple of ->backup_blocks up to *suspend_point
3951 */
3952 if (advancing)
3953 return need_backup > info->reshape_progress;
3954 else
3955 return need_backup >= info->reshape_progress;
3956
3957 check_progress:
3958 /* if we couldn't read a number from sync_completed, then
3959 * either the reshape did complete, or it aborted.
3960 * We can tell which by checking for 'none' in reshape_position.
3961 * If it did abort, then it might immediately restart if it
3962 * it was just a device failure that leaves us degraded but
3963 * functioning.
3964 */
3965 if (sysfs_get_str(info, NULL, "reshape_position", buf, sizeof(buf)) < 0
3966 || strncmp(buf, "none", 4) != 0) {
3967 /* The abort might only be temporary. Wait up to 10
3968 * seconds for fd to contain a valid number again.
3969 */
3970 int wait = 10000;
3971 int rv = -2;
3972 unsigned long long new_sync_max;
3973 while (fd >= 0 && rv < 0 && wait > 0) {
3974 if (sysfs_wait(fd, &wait) != 1)
3975 break;
3976 switch (sysfs_fd_get_ll(fd, &completed)) {
3977 case 0:
3978 /* all good again */
3979 rv = 1;
3980 /* If "sync_max" is no longer max_progress
3981 * we need to freeze things
3982 */
3983 sysfs_get_ll(info, NULL, "sync_max", &new_sync_max);
3984 *frozen = (new_sync_max != max_progress);
3985 break;
3986 case -2: /* read error - abort */
3987 wait = 0;
3988 break;
3989 }
3990 }
3991 if (fd >= 0)
3992 close(fd);
3993 return rv; /* abort */
3994 } else {
3995 /* Maybe racing with array shutdown - check state */
3996 if (fd >= 0)
3997 close(fd);
3998 if (sysfs_get_str(info, NULL, "array_state", buf, sizeof(buf)) < 0
3999 || strncmp(buf, "inactive", 8) == 0
4000 || strncmp(buf, "clear",5) == 0)
4001 return -2; /* abort */
4002 return -1; /* complete */
4003 }
4004 }
4005
4006 /* FIXME return status is never checked */
4007 static int grow_backup(struct mdinfo *sra,
4008 unsigned long long offset, /* per device */
4009 unsigned long stripes, /* per device, in old chunks */
4010 int *sources, unsigned long long *offsets,
4011 int disks, int chunk, int level, int layout,
4012 int dests, int *destfd, unsigned long long *destoffsets,
4013 int part, int *degraded,
4014 char *buf)
4015 {
4016 /* Backup 'blocks' sectors at 'offset' on each device of the array,
4017 * to storage 'destfd' (offset 'destoffsets'), after first
4018 * suspending IO. Then allow resync to continue
4019 * over the suspended section.
4020 * Use part 'part' of the backup-super-block.
4021 */
4022 int odata = disks;
4023 int rv = 0;
4024 int i;
4025 unsigned long long ll;
4026 int new_degraded;
4027 //printf("offset %llu\n", offset);
4028 if (level >= 4)
4029 odata--;
4030 if (level == 6)
4031 odata--;
4032
4033 /* Check that array hasn't become degraded, else we might backup the wrong data */
4034 if (sysfs_get_ll(sra, NULL, "degraded", &ll) < 0)
4035 return -1; /* FIXME this error is ignored */
4036 new_degraded = (int)ll;
4037 if (new_degraded != *degraded) {
4038 /* check each device to ensure it is still working */
4039 struct mdinfo *sd;
4040 for (sd = sra->devs ; sd ; sd = sd->next) {
4041 if (sd->disk.state & (1<<MD_DISK_FAULTY))
4042 continue;
4043 if (sd->disk.state & (1<<MD_DISK_SYNC)) {
4044 char sbuf[100];
4045
4046 if (sysfs_get_str(sra, sd, "state",
4047 sbuf, sizeof(sbuf)) < 0 ||
4048 strstr(sbuf, "faulty") ||
4049 strstr(sbuf, "in_sync") == NULL) {
4050 /* this device is dead */
4051 sd->disk.state = (1<<MD_DISK_FAULTY);
4052 if (sd->disk.raid_disk >= 0 &&
4053 sources[sd->disk.raid_disk] >= 0) {
4054 close(sources[sd->disk.raid_disk]);
4055 sources[sd->disk.raid_disk] = -1;
4056 }
4057 }
4058 }
4059 }
4060 *degraded = new_degraded;
4061 }
4062 if (part) {
4063 bsb.arraystart2 = __cpu_to_le64(offset * odata);
4064 bsb.length2 = __cpu_to_le64(stripes * (chunk/512) * odata);
4065 } else {
4066 bsb.arraystart = __cpu_to_le64(offset * odata);
4067 bsb.length = __cpu_to_le64(stripes * (chunk/512) * odata);
4068 }
4069 if (part)
4070 bsb.magic[15] = '2';
4071 for (i = 0; i < dests; i++)
4072 if (part)
4073 lseek64(destfd[i], destoffsets[i] + __le64_to_cpu(bsb.devstart2)*512, 0);
4074 else
4075 lseek64(destfd[i], destoffsets[i], 0);
4076
4077 rv = save_stripes(sources, offsets,
4078 disks, chunk, level, layout,
4079 dests, destfd,
4080 offset*512*odata, stripes * chunk * odata,
4081 buf);
4082
4083 if (rv)
4084 return rv;
4085 bsb.mtime = __cpu_to_le64(time(0));
4086 for (i = 0; i < dests; i++) {
4087 bsb.devstart = __cpu_to_le64(destoffsets[i]/512);
4088
4089 bsb.sb_csum = bsb_csum((char*)&bsb, ((char*)&bsb.sb_csum)-((char*)&bsb));
4090 if (memcmp(bsb.magic, "md_backup_data-2", 16) == 0)
4091 bsb.sb_csum2 = bsb_csum((char*)&bsb,
4092 ((char*)&bsb.sb_csum2)-((char*)&bsb));
4093
4094 rv = -1;
4095 if ((unsigned long long)lseek64(destfd[i], destoffsets[i] - 4096, 0)
4096 != destoffsets[i] - 4096)
4097 break;
4098 if (write(destfd[i], &bsb, 512) != 512)
4099 break;
4100 if (destoffsets[i] > 4096) {
4101 if ((unsigned long long)lseek64(destfd[i], destoffsets[i]+stripes*chunk*odata, 0) !=
4102 destoffsets[i]+stripes*chunk*odata)
4103 break;
4104 if (write(destfd[i], &bsb, 512) != 512)
4105 break;
4106 }
4107 fsync(destfd[i]);
4108 rv = 0;
4109 }
4110
4111 return rv;
4112 }
4113
4114 /* in 2.6.30, the value reported by sync_completed can be
4115 * less that it should be by one stripe.
4116 * This only happens when reshape hits sync_max and pauses.
4117 * So allow wait_backup to either extent sync_max further
4118 * than strictly necessary, or return before the
4119 * sync has got quite as far as we would really like.
4120 * This is what 'blocks2' is for.
4121 * The various caller give appropriate values so that
4122 * every works.
4123 */
4124 /* FIXME return value is often ignored */
4125 static int forget_backup(int dests, int *destfd,
4126 unsigned long long *destoffsets,
4127 int part)
4128 {
4129 /*
4130 * Erase backup 'part' (which is 0 or 1)
4131 */
4132 int i;
4133 int rv;
4134
4135 if (part) {
4136 bsb.arraystart2 = __cpu_to_le64(0);
4137 bsb.length2 = __cpu_to_le64(0);
4138 } else {
4139 bsb.arraystart = __cpu_to_le64(0);
4140 bsb.length = __cpu_to_le64(0);
4141 }
4142 bsb.mtime = __cpu_to_le64(time(0));
4143 rv = 0;
4144 for (i = 0; i < dests; i++) {
4145 bsb.devstart = __cpu_to_le64(destoffsets[i]/512);
4146 bsb.sb_csum = bsb_csum((char*)&bsb, ((char*)&bsb.sb_csum)-((char*)&bsb));
4147 if (memcmp(bsb.magic, "md_backup_data-2", 16) == 0)
4148 bsb.sb_csum2 = bsb_csum((char*)&bsb,
4149 ((char*)&bsb.sb_csum2)-((char*)&bsb));
4150 if ((unsigned long long)lseek64(destfd[i], destoffsets[i]-4096, 0) !=
4151 destoffsets[i]-4096)
4152 rv = -1;
4153 if (rv == 0 &&
4154 write(destfd[i], &bsb, 512) != 512)
4155 rv = -1;
4156 fsync(destfd[i]);
4157 }
4158 return rv;
4159 }
4160
4161 static void fail(char *msg)
4162 {
4163 int rv;
4164 rv = (write(2, msg, strlen(msg)) != (int)strlen(msg));
4165 rv |= (write(2, "\n", 1) != 1);
4166 exit(rv ? 1 : 2);
4167 }
4168
4169 static char *abuf, *bbuf;
4170 static unsigned long long abuflen;
4171 static void validate(int afd, int bfd, unsigned long long offset)
4172 {
4173 /* check that the data in the backup against the array.
4174 * This is only used for regression testing and should not
4175 * be used while the array is active
4176 */
4177 if (afd < 0)
4178 return;
4179 lseek64(bfd, offset - 4096, 0);
4180 if (read(bfd, &bsb2, 512) != 512)
4181 fail("cannot read bsb");
4182 if (bsb2.sb_csum != bsb_csum((char*)&bsb2,
4183 ((char*)&bsb2.sb_csum)-((char*)&bsb2)))
4184 fail("first csum bad");
4185 if (memcmp(bsb2.magic, "md_backup_data", 14) != 0)
4186 fail("magic is bad");
4187 if (memcmp(bsb2.magic, "md_backup_data-2", 16) == 0 &&
4188 bsb2.sb_csum2 != bsb_csum((char*)&bsb2,
4189 ((char*)&bsb2.sb_csum2)-((char*)&bsb2)))
4190 fail("second csum bad");
4191
4192 if (__le64_to_cpu(bsb2.devstart)*512 != offset)
4193 fail("devstart is wrong");
4194
4195 if (bsb2.length) {
4196 unsigned long long len = __le64_to_cpu(bsb2.length)*512;
4197
4198 if (abuflen < len) {
4199 free(abuf);
4200 free(bbuf);
4201 abuflen = len;
4202 if (posix_memalign((void**)&abuf, 4096, abuflen) ||
4203 posix_memalign((void**)&bbuf, 4096, abuflen)) {
4204 abuflen = 0;
4205 /* just stop validating on mem-alloc failure */
4206 return;
4207 }
4208 }
4209
4210 lseek64(bfd, offset, 0);
4211 if ((unsigned long long)read(bfd, bbuf, len) != len) {
4212 //printf("len %llu\n", len);
4213 fail("read first backup failed");
4214 }
4215 lseek64(afd, __le64_to_cpu(bsb2.arraystart)*512, 0);
4216 if ((unsigned long long)read(afd, abuf, len) != len)
4217 fail("read first from array failed");
4218 if (memcmp(bbuf, abuf, len) != 0) {
4219 #if 0
4220 int i;
4221 printf("offset=%llu len=%llu\n",
4222 (unsigned long long)__le64_to_cpu(bsb2.arraystart)*512, len);
4223 for (i=0; i<len; i++)
4224 if (bbuf[i] != abuf[i]) {
4225 printf("first diff byte %d\n", i);
4226 break;
4227 }
4228 #endif
4229 fail("data1 compare failed");
4230 }
4231 }
4232 if (bsb2.length2) {
4233 unsigned long long len = __le64_to_cpu(bsb2.length2)*512;
4234
4235 if (abuflen < len) {
4236 free(abuf);
4237 free(bbuf);
4238 abuflen = len;
4239 abuf = xmalloc(abuflen);
4240 bbuf = xmalloc(abuflen);
4241 }
4242
4243 lseek64(bfd, offset+__le64_to_cpu(bsb2.devstart2)*512, 0);
4244 if ((unsigned long long)read(bfd, bbuf, len) != len)
4245 fail("read second backup failed");
4246 lseek64(afd, __le64_to_cpu(bsb2.arraystart2)*512, 0);
4247 if ((unsigned long long)read(afd, abuf, len) != len)
4248 fail("read second from array failed");
4249 if (memcmp(bbuf, abuf, len) != 0)
4250 fail("data2 compare failed");
4251 }
4252 }
4253
4254 int child_monitor(int afd, struct mdinfo *sra, struct reshape *reshape,
4255 struct supertype *st, unsigned long blocks,
4256 int *fds, unsigned long long *offsets,
4257 int dests, int *destfd, unsigned long long *destoffsets)
4258 {
4259 /* Monitor a reshape where backup is being performed using
4260 * 'native' mechanism - either to a backup file, or
4261 * to some space in a spare.
4262 */
4263 char *buf;
4264 int degraded = -1;
4265 unsigned long long speed;
4266 unsigned long long suspend_point, array_size;
4267 unsigned long long backup_point, wait_point;
4268 unsigned long long reshape_completed;
4269 int done = 0;
4270 int increasing = reshape->after.data_disks >= reshape->before.data_disks;
4271 int part = 0; /* The next part of the backup area to fill. It may already
4272 * be full, so we need to check */
4273 int level = reshape->level;
4274 int layout = reshape->before.layout;
4275 int data = reshape->before.data_disks;
4276 int disks = reshape->before.data_disks + reshape->parity;
4277 int chunk = sra->array.chunk_size;
4278 struct mdinfo *sd;
4279 unsigned long stripes;
4280 int uuid[4];
4281 int frozen = 0;
4282
4283 /* set up the backup-super-block. This requires the
4284 * uuid from the array.
4285 */
4286 /* Find a superblock */
4287 for (sd = sra->devs; sd; sd = sd->next) {
4288 char *dn;
4289 int devfd;
4290 int ok;
4291 if (sd->disk.state & (1<<MD_DISK_FAULTY))
4292 continue;
4293 dn = map_dev(sd->disk.major, sd->disk.minor, 1);
4294 devfd = dev_open(dn, O_RDONLY);
4295 if (devfd < 0)
4296 continue;
4297 ok = st->ss->load_super(st, devfd, NULL);
4298 close(devfd);
4299 if (ok == 0)
4300 break;
4301 }
4302 if (!sd) {
4303 pr_err("Cannot find a superblock\n");
4304 return 0;
4305 }
4306
4307 memset(&bsb, 0, 512);
4308 memcpy(bsb.magic, "md_backup_data-1", 16);
4309 st->ss->uuid_from_super(st, uuid);
4310 memcpy(bsb.set_uuid, uuid, 16);
4311 bsb.mtime = __cpu_to_le64(time(0));
4312 bsb.devstart2 = blocks;
4313
4314 stripes = blocks / (sra->array.chunk_size/512) /
4315 reshape->before.data_disks;
4316
4317 if (posix_memalign((void**)&buf, 4096, disks * chunk))
4318 /* Don't start the 'reshape' */
4319 return 0;
4320 if (reshape->before.data_disks == reshape->after.data_disks) {
4321 sysfs_get_ll(sra, NULL, "sync_speed_min", &speed);
4322 sysfs_set_num(sra, NULL, "sync_speed_min", 200000);
4323 }
4324
4325 if (increasing) {
4326 array_size = sra->component_size * reshape->after.data_disks;
4327 backup_point = sra->reshape_progress;
4328 suspend_point = 0;
4329 } else {
4330 array_size = sra->component_size * reshape->before.data_disks;
4331 backup_point = reshape->backup_blocks;
4332 suspend_point = array_size;
4333 }
4334
4335 while (!done) {
4336 int rv;
4337
4338 /* Want to return as soon the oldest backup slot can
4339 * be released as that allows us to start backing up
4340 * some more, providing suspend_point has been
4341 * advanced, which it should have.
4342 */
4343 if (increasing) {
4344 wait_point = array_size;
4345 if (part == 0 && __le64_to_cpu(bsb.length) > 0)
4346 wait_point = (__le64_to_cpu(bsb.arraystart) +
4347 __le64_to_cpu(bsb.length));
4348 if (part == 1 && __le64_to_cpu(bsb.length2) > 0)
4349 wait_point = (__le64_to_cpu(bsb.arraystart2) +
4350 __le64_to_cpu(bsb.length2));
4351 } else {
4352 wait_point = 0;
4353 if (part == 0 && __le64_to_cpu(bsb.length) > 0)
4354 wait_point = __le64_to_cpu(bsb.arraystart);
4355 if (part == 1 && __le64_to_cpu(bsb.length2) > 0)
4356 wait_point = __le64_to_cpu(bsb.arraystart2);
4357 }
4358
4359 reshape_completed = sra->reshape_progress;
4360 rv = progress_reshape(sra, reshape,
4361 backup_point, wait_point,
4362 &suspend_point, &reshape_completed,
4363 &frozen);
4364 /* external metadata would need to ping_monitor here */
4365 sra->reshape_progress = reshape_completed;
4366
4367 /* Clear any backup region that is before 'here' */
4368 if (increasing) {
4369 if (__le64_to_cpu(bsb.length) > 0 &&
4370 reshape_completed >= (__le64_to_cpu(bsb.arraystart) +
4371 __le64_to_cpu(bsb.length)))
4372 forget_backup(dests, destfd,
4373 destoffsets, 0);
4374 if (__le64_to_cpu(bsb.length2) > 0 &&
4375 reshape_completed >= (__le64_to_cpu(bsb.arraystart2) +
4376 __le64_to_cpu(bsb.length2)))
4377 forget_backup(dests, destfd,
4378 destoffsets, 1);
4379 } else {
4380 if (__le64_to_cpu(bsb.length) > 0 &&
4381 reshape_completed <= (__le64_to_cpu(bsb.arraystart)))
4382 forget_backup(dests, destfd,
4383 destoffsets, 0);
4384 if (__le64_to_cpu(bsb.length2) > 0 &&
4385 reshape_completed <= (__le64_to_cpu(bsb.arraystart2)))
4386 forget_backup(dests, destfd,
4387 destoffsets, 1);
4388 }
4389 if (sigterm)
4390 rv = -2;
4391 if (rv < 0) {
4392 if (rv == -1)
4393 done = 1;
4394 break;
4395 }
4396 if (rv == 0 && increasing && !st->ss->external) {
4397 /* No longer need to monitor this reshape */
4398 sysfs_set_str(sra, NULL, "sync_max", "max");
4399 done = 1;
4400 break;
4401 }
4402
4403 while (rv) {
4404 unsigned long long offset;
4405 unsigned long actual_stripes;
4406 /* Need to backup some data.
4407 * If 'part' is not used and the desired
4408 * backup size is suspended, do a backup,
4409 * then consider the next part.
4410 */
4411 /* Check that 'part' is unused */
4412 if (part == 0 && __le64_to_cpu(bsb.length) != 0)
4413 break;
4414 if (part == 1 && __le64_to_cpu(bsb.length2) != 0)
4415 break;
4416
4417 offset = backup_point / data;
4418 actual_stripes = stripes;
4419 if (increasing) {
4420 if (offset + actual_stripes * (chunk/512) >
4421 sra->component_size)
4422 actual_stripes = ((sra->component_size - offset)
4423 / (chunk/512));
4424 if (offset + actual_stripes * (chunk/512) >
4425 suspend_point/data)
4426 break;
4427 } else {
4428 if (offset < actual_stripes * (chunk/512))
4429 actual_stripes = offset / (chunk/512);
4430 offset -= actual_stripes * (chunk/512);
4431 if (offset < suspend_point/data)
4432 break;
4433 }
4434 if (actual_stripes == 0)
4435 break;
4436 grow_backup(sra, offset, actual_stripes,
4437 fds, offsets,
4438 disks, chunk, level, layout,
4439 dests, destfd, destoffsets,
4440 part, &degraded, buf);
4441 validate(afd, destfd[0], destoffsets[0]);
4442 /* record where 'part' is up to */
4443 part = !part;
4444 if (increasing)
4445 backup_point += actual_stripes * (chunk/512) * data;
4446 else
4447 backup_point -= actual_stripes * (chunk/512) * data;
4448 }
4449 }
4450
4451 /* FIXME maybe call progress_reshape one more time instead */
4452 /* remove any remaining suspension */
4453 sysfs_set_num(sra, NULL, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL);
4454 sysfs_set_num(sra, NULL, "suspend_hi", 0);
4455 sysfs_set_num(sra, NULL, "suspend_lo", 0);
4456 sysfs_set_num(sra, NULL, "sync_min", 0);
4457
4458 if (reshape->before.data_disks == reshape->after.data_disks)
4459 sysfs_set_num(sra, NULL, "sync_speed_min", speed);
4460 free(buf);
4461 return done;
4462 }
4463
4464 /*
4465 * If any spare contains md_back_data-1 which is recent wrt mtime,
4466 * write that data into the array and update the super blocks with
4467 * the new reshape_progress
4468 */
4469 int Grow_restart(struct supertype *st, struct mdinfo *info, int *fdlist, int cnt,
4470 char *backup_file, int verbose)
4471 {
4472 int i, j;
4473 int old_disks;
4474 unsigned long long *offsets;
4475 unsigned long long nstripe, ostripe;
4476 int ndata, odata;
4477
4478 odata = info->array.raid_disks - info->delta_disks - 1;
4479 if (info->array.level == 6) odata--; /* number of data disks */
4480 ndata = info->array.raid_disks - 1;
4481 if (info->new_level == 6) ndata--;
4482
4483 old_disks = info->array.raid_disks - info->delta_disks;
4484
4485 if (info->delta_disks <= 0)
4486 /* Didn't grow, so the backup file must have
4487 * been used
4488 */
4489 old_disks = cnt;
4490 for (i=old_disks-(backup_file?1:0); i<cnt; i++) {
4491 struct mdinfo dinfo;
4492 int fd;
4493 int bsbsize;
4494 char *devname, namebuf[20];
4495 unsigned long long lo, hi;
4496
4497 /* This was a spare and may have some saved data on it.
4498 * Load the superblock, find and load the
4499 * backup_super_block.
4500 * If either fail, go on to next device.
4501 * If the backup contains no new info, just return
4502 * else restore data and update all superblocks
4503 */
4504 if (i == old_disks-1) {
4505 fd = open(backup_file, O_RDONLY);
4506 if (fd<0) {
4507 pr_err("backup file %s inaccessible: %s\n",
4508 backup_file, strerror(errno));
4509 continue;
4510 }
4511 devname = backup_file;
4512 } else {
4513 fd = fdlist[i];
4514 if (fd < 0)
4515 continue;
4516 if (st->ss->load_super(st, fd, NULL))
4517 continue;
4518
4519 st->ss->getinfo_super(st, &dinfo, NULL);
4520 st->ss->free_super(st);
4521
4522 if (lseek64(fd,
4523 (dinfo.data_offset + dinfo.component_size - 8) <<9,
4524 0) < 0) {
4525 pr_err("Cannot seek on device %d\n", i);
4526 continue; /* Cannot seek */
4527 }
4528 sprintf(namebuf, "device-%d", i);
4529 devname = namebuf;
4530 }
4531 if (read(fd, &bsb, sizeof(bsb)) != sizeof(bsb)) {
4532 if (verbose)
4533 pr_err("Cannot read from %s\n", devname);
4534 continue; /* Cannot read */
4535 }
4536 if (memcmp(bsb.magic, "md_backup_data-1", 16) != 0 &&
4537 memcmp(bsb.magic, "md_backup_data-2", 16) != 0) {
4538 if (verbose)
4539 pr_err("No backup metadata on %s\n", devname);
4540 continue;
4541 }
4542 if (bsb.sb_csum != bsb_csum((char*)&bsb, ((char*)&bsb.sb_csum)-((char*)&bsb))) {
4543 if (verbose)
4544 pr_err("Bad backup-metadata checksum on %s\n", devname);
4545 continue; /* bad checksum */
4546 }
4547 if (memcmp(bsb.magic, "md_backup_data-2", 16) == 0 &&
4548 bsb.sb_csum2 != bsb_csum((char*)&bsb, ((char*)&bsb.sb_csum2)-((char*)&bsb))) {
4549 if (verbose)
4550 pr_err("Bad backup-metadata checksum2 on %s\n", devname);
4551 continue; /* Bad second checksum */
4552 }
4553 if (memcmp(bsb.set_uuid,info->uuid, 16) != 0) {
4554 if (verbose)
4555 pr_err("Wrong uuid on backup-metadata on %s\n", devname);
4556 continue; /* Wrong uuid */
4557 }
4558
4559 /* array utime and backup-mtime should be updated at much the same time, but it seems that
4560 * sometimes they aren't... So allow considerable flexability in matching, and allow
4561 * this test to be overridden by an environment variable.
4562 */
4563 if(time_after(info->array.utime, (unsigned int)__le64_to_cpu(bsb.mtime) + 2*60*60) ||
4564 time_before(info->array.utime, (unsigned int)__le64_to_cpu(bsb.mtime) - 10*60)) {
4565 if (check_env("MDADM_GROW_ALLOW_OLD")) {
4566 pr_err("accepting backup with timestamp %lu for array with timestamp %lu\n",
4567 (unsigned long)__le64_to_cpu(bsb.mtime),
4568 (unsigned long)info->array.utime);
4569 } else {
4570 pr_err("too-old timestamp on backup-metadata on %s\n", devname);
4571 pr_err("If you think it is should be safe, try 'export MDADM_GROW_ALLOW_OLD=1'\n");
4572 continue; /* time stamp is too bad */
4573 }
4574 }
4575
4576 if (bsb.magic[15] == '1') {
4577 if (bsb.length == 0)
4578 continue;
4579 if (info->delta_disks >= 0) {
4580 /* reshape_progress is increasing */
4581 if (__le64_to_cpu(bsb.arraystart)
4582 + __le64_to_cpu(bsb.length)
4583 < info->reshape_progress) {
4584 nonew:
4585 if (verbose)
4586 pr_err("backup-metadata found on %s but is not needed\n", devname);
4587 continue; /* No new data here */
4588 }
4589 } else {
4590 /* reshape_progress is decreasing */
4591 if (__le64_to_cpu(bsb.arraystart) >=
4592 info->reshape_progress)
4593 goto nonew; /* No new data here */
4594 }
4595 } else {
4596 if (bsb.length == 0 && bsb.length2 == 0)
4597 continue;
4598 if (info->delta_disks >= 0) {
4599 /* reshape_progress is increasing */
4600 if ((__le64_to_cpu(bsb.arraystart)
4601 + __le64_to_cpu(bsb.length)
4602 < info->reshape_progress)
4603 &&
4604 (__le64_to_cpu(bsb.arraystart2)
4605 + __le64_to_cpu(bsb.length2)
4606 < info->reshape_progress))
4607 goto nonew; /* No new data here */
4608 } else {
4609 /* reshape_progress is decreasing */
4610 if (__le64_to_cpu(bsb.arraystart) >=
4611 info->reshape_progress &&
4612 __le64_to_cpu(bsb.arraystart2) >=
4613 info->reshape_progress)
4614 goto nonew; /* No new data here */
4615 }
4616 }
4617 if (lseek64(fd, __le64_to_cpu(bsb.devstart)*512, 0)< 0) {
4618 second_fail:
4619 if (verbose)
4620 pr_err("Failed to verify secondary backup-metadata block on %s\n",
4621 devname);
4622 continue; /* Cannot seek */
4623 }
4624 /* There should be a duplicate backup superblock 4k before here */
4625 if (lseek64(fd, -4096, 1) < 0 ||
4626 read(fd, &bsb2, sizeof(bsb2)) != sizeof(bsb2))
4627 goto second_fail; /* Cannot find leading superblock */
4628 if (bsb.magic[15] == '1')
4629 bsbsize = offsetof(struct mdp_backup_super, pad1);
4630 else
4631 bsbsize = offsetof(struct mdp_backup_super, pad);
4632 if (memcmp(&bsb2, &bsb, bsbsize) != 0)
4633 goto second_fail; /* Cannot find leading superblock */
4634
4635 /* Now need the data offsets for all devices. */
4636 offsets = xmalloc(sizeof(*offsets)*info->array.raid_disks);
4637 for(j=0; j<info->array.raid_disks; j++) {
4638 if (fdlist[j] < 0)
4639 continue;
4640 if (st->ss->load_super(st, fdlist[j], NULL))
4641 /* FIXME should be this be an error */
4642 continue;
4643 st->ss->getinfo_super(st, &dinfo, NULL);
4644 st->ss->free_super(st);
4645 offsets[j] = dinfo.data_offset * 512;
4646 }
4647 printf("%s: restoring critical section\n", Name);
4648
4649 if (restore_stripes(fdlist, offsets,
4650 info->array.raid_disks,
4651 info->new_chunk,
4652 info->new_level,
4653 info->new_layout,
4654 fd, __le64_to_cpu(bsb.devstart)*512,
4655 __le64_to_cpu(bsb.arraystart)*512,
4656 __le64_to_cpu(bsb.length)*512, NULL)) {
4657 /* didn't succeed, so giveup */
4658 if (verbose)
4659 pr_err("Error restoring backup from %s\n",
4660 devname);
4661 free(offsets);
4662 return 1;
4663 }
4664
4665 if (bsb.magic[15] == '2' &&
4666 restore_stripes(fdlist, offsets,
4667 info->array.raid_disks,
4668 info->new_chunk,
4669 info->new_level,
4670 info->new_layout,
4671 fd, __le64_to_cpu(bsb.devstart)*512 +
4672 __le64_to_cpu(bsb.devstart2)*512,
4673 __le64_to_cpu(bsb.arraystart2)*512,
4674 __le64_to_cpu(bsb.length2)*512, NULL)) {
4675 /* didn't succeed, so giveup */
4676 if (verbose)
4677 pr_err("Error restoring second backup from %s\n",
4678 devname);
4679 free(offsets);
4680 return 1;
4681 }
4682
4683 free(offsets);
4684
4685 /* Ok, so the data is restored. Let's update those superblocks. */
4686
4687 lo = hi = 0;
4688 if (bsb.length) {
4689 lo = __le64_to_cpu(bsb.arraystart);
4690 hi = lo + __le64_to_cpu(bsb.length);
4691 }
4692 if (bsb.magic[15] == '2' && bsb.length2) {
4693 unsigned long long lo1, hi1;
4694 lo1 = __le64_to_cpu(bsb.arraystart2);
4695 hi1 = lo1 + __le64_to_cpu(bsb.length2);
4696 if (lo == hi) {
4697 lo = lo1;
4698 hi = hi1;
4699 } else if (lo < lo1)
4700 hi = hi1;
4701 else
4702 lo = lo1;
4703 }
4704 if (lo < hi &&
4705 (info->reshape_progress < lo ||
4706 info->reshape_progress > hi))
4707 /* backup does not affect reshape_progress*/ ;
4708 else if (info->delta_disks >= 0) {
4709 info->reshape_progress = __le64_to_cpu(bsb.arraystart) +
4710 __le64_to_cpu(bsb.length);
4711 if (bsb.magic[15] == '2') {
4712 unsigned long long p2 = __le64_to_cpu(bsb.arraystart2) +
4713 __le64_to_cpu(bsb.length2);
4714 if (p2 > info->reshape_progress)
4715 info->reshape_progress = p2;
4716 }
4717 } else {
4718 info->reshape_progress = __le64_to_cpu(bsb.arraystart);
4719 if (bsb.magic[15] == '2') {
4720 unsigned long long p2 = __le64_to_cpu(bsb.arraystart2);
4721 if (p2 < info->reshape_progress)
4722 info->reshape_progress = p2;
4723 }
4724 }
4725 for (j=0; j<info->array.raid_disks; j++) {
4726 if (fdlist[j] < 0)
4727 continue;
4728 if (st->ss->load_super(st, fdlist[j], NULL))
4729 continue;
4730 st->ss->getinfo_super(st, &dinfo, NULL);
4731 dinfo.reshape_progress = info->reshape_progress;
4732 st->ss->update_super(st, &dinfo,
4733 "_reshape_progress",
4734 NULL,0, 0, NULL);
4735 st->ss->store_super(st, fdlist[j]);
4736 st->ss->free_super(st);
4737 }
4738 return 0;
4739 }
4740 /* Didn't find any backup data, try to see if any
4741 * was needed.
4742 */
4743 if (info->delta_disks < 0) {
4744 /* When shrinking, the critical section is at the end.
4745 * So see if we are before the critical section.
4746 */
4747 unsigned long long first_block;
4748 nstripe = ostripe = 0;
4749 first_block = 0;
4750 while (ostripe >= nstripe) {
4751 ostripe += info->array.chunk_size / 512;
4752 first_block = ostripe * odata;
4753 nstripe = first_block / ndata / (info->new_chunk/512) *
4754 (info->new_chunk/512);
4755 }
4756
4757 if (info->reshape_progress >= first_block)
4758 return 0;
4759 }
4760 if (info->delta_disks > 0) {
4761 /* See if we are beyond the critical section. */
4762 unsigned long long last_block;
4763 nstripe = ostripe = 0;
4764 last_block = 0;
4765 while (nstripe >= ostripe) {
4766 nstripe += info->new_chunk / 512;
4767 last_block = nstripe * ndata;
4768 ostripe = last_block / odata / (info->array.chunk_size/512) *
4769 (info->array.chunk_size/512);
4770 }
4771
4772 if (info->reshape_progress >= last_block)
4773 return 0;
4774 }
4775 /* needed to recover critical section! */
4776 if (verbose)
4777 pr_err("Failed to find backup of critical section\n");
4778 return 1;
4779 }
4780
4781 int Grow_continue_command(char *devname, int fd,
4782 char *backup_file, int verbose)
4783 {
4784 int ret_val = 0;
4785 struct supertype *st = NULL;
4786 struct mdinfo *content = NULL;
4787 struct mdinfo array;
4788 char *subarray = NULL;
4789 struct mdinfo *cc = NULL;
4790 struct mdstat_ent *mdstat = NULL;
4791 int cfd = -1;
4792 int fd2;
4793
4794 dprintf("Grow continue from command line called for %s\n",
4795 devname);
4796
4797 st = super_by_fd(fd, &subarray);
4798 if (!st || !st->ss) {
4799 pr_err("Unable to determine metadata format for %s\n",
4800 devname);
4801 return 1;
4802 }
4803 dprintf("Grow continue is run for ");
4804 if (st->ss->external == 0) {
4805 int d;
4806 int cnt = 5;
4807 dprintf_cont("native array (%s)\n", devname);
4808 if (ioctl(fd, GET_ARRAY_INFO, &array.array) < 0) {
4809 pr_err("%s is not an active md array - aborting\n", devname);
4810 ret_val = 1;
4811 goto Grow_continue_command_exit;
4812 }
4813 content = &array;
4814 /* Need to load a superblock.
4815 * FIXME we should really get what we need from
4816 * sysfs
4817 */
4818 do {
4819 for (d = 0; d < MAX_DISKS; d++) {
4820 mdu_disk_info_t disk;
4821 char *dv;
4822 int err;
4823 disk.number = d;
4824 if (ioctl(fd, GET_DISK_INFO, &disk) < 0)
4825 continue;
4826 if (disk.major == 0 && disk.minor == 0)
4827 continue;
4828 if ((disk.state & (1 << MD_DISK_ACTIVE)) == 0)
4829 continue;
4830 dv = map_dev(disk.major, disk.minor, 1);
4831 if (!dv)
4832 continue;
4833 fd2 = dev_open(dv, O_RDONLY);
4834 if (fd2 < 0)
4835 continue;
4836 err = st->ss->load_super(st, fd2, NULL);
4837 close(fd2);
4838 if (err)
4839 continue;
4840 break;
4841 }
4842 if (d == MAX_DISKS) {
4843 pr_err("Unable to load metadata for %s\n",
4844 devname);
4845 ret_val = 1;
4846 goto Grow_continue_command_exit;
4847 }
4848 st->ss->getinfo_super(st, content, NULL);
4849 if (!content->reshape_active)
4850 sleep(3);
4851 else
4852 break;
4853 } while (cnt-- > 0);
4854 } else {
4855 char *container;
4856
4857 if (subarray) {
4858 dprintf_cont("subarray (%s)\n", subarray);
4859 container = st->container_devnm;
4860 cfd = open_dev_excl(st->container_devnm);
4861 } else {
4862 container = st->devnm;
4863 close(fd);
4864 cfd = open_dev_excl(st->devnm);
4865 dprintf_cont("container (%s)\n", container);
4866 fd = cfd;
4867 }
4868 if (cfd < 0) {
4869 pr_err("Unable to open container for %s\n", devname);
4870 ret_val = 1;
4871 goto Grow_continue_command_exit;
4872 }
4873
4874 /* find in container array under reshape
4875 */
4876 ret_val = st->ss->load_container(st, cfd, NULL);
4877 if (ret_val) {
4878 pr_err("Cannot read superblock for %s\n",
4879 devname);
4880 ret_val = 1;
4881 goto Grow_continue_command_exit;
4882 }
4883
4884 cc = st->ss->container_content(st, subarray);
4885 for (content = cc; content ; content = content->next) {
4886 char *array;
4887 int allow_reshape = 1;
4888
4889 if (content->reshape_active == 0)
4890 continue;
4891 /* The decision about array or container wide
4892 * reshape is taken in Grow_continue based
4893 * content->reshape_active state, therefore we
4894 * need to check_reshape based on
4895 * reshape_active and subarray name
4896 */
4897 if (content->array.state & (1<<MD_SB_BLOCK_VOLUME))
4898 allow_reshape = 0;
4899 if (content->reshape_active == CONTAINER_RESHAPE &&
4900 (content->array.state
4901 & (1<<MD_SB_BLOCK_CONTAINER_RESHAPE)))
4902 allow_reshape = 0;
4903
4904 if (!allow_reshape) {
4905 pr_err("cannot continue reshape of an array in container with unsupported metadata: %s(%s)\n",
4906 devname, container);
4907 ret_val = 1;
4908 goto Grow_continue_command_exit;
4909 }
4910
4911 array = strchr(content->text_version+1, '/')+1;
4912 mdstat = mdstat_by_subdev(array, container);
4913 if (!mdstat)
4914 continue;
4915 if (mdstat->active == 0) {
4916 pr_err("Skipping inactive array %s.\n",
4917 mdstat->devnm);
4918 free_mdstat(mdstat);
4919 mdstat = NULL;
4920 continue;
4921 }
4922 break;
4923 }
4924 if (!content) {
4925 pr_err("Unable to determine reshaped array for %s\n", devname);
4926 ret_val = 1;
4927 goto Grow_continue_command_exit;
4928 }
4929 fd2 = open_dev(mdstat->devnm);
4930 if (fd2 < 0) {
4931 pr_err("cannot open (%s)\n", mdstat->devnm);
4932 ret_val = 1;
4933 goto Grow_continue_command_exit;
4934 }
4935
4936 sysfs_init(content, fd2, mdstat->devnm);
4937
4938 close(fd2);
4939
4940 /* start mdmon in case it is not running
4941 */
4942 if (!mdmon_running(container))
4943 start_mdmon(container);
4944 ping_monitor(container);
4945
4946 if (mdmon_running(container))
4947 st->update_tail = &st->updates;
4948 else {
4949 pr_err("No mdmon found. Grow cannot continue.\n");
4950 ret_val = 1;
4951 goto Grow_continue_command_exit;
4952 }
4953 }
4954
4955 /* verify that array under reshape is started from
4956 * correct position
4957 */
4958 if (verify_reshape_position(content, content->array.level) < 0) {
4959 ret_val = 1;
4960 goto Grow_continue_command_exit;
4961 }
4962
4963 /* continue reshape
4964 */
4965 ret_val = Grow_continue(fd, st, content, backup_file, 1, 0);
4966
4967 Grow_continue_command_exit:
4968 if (cfd > -1)
4969 close(cfd);
4970 st->ss->free_super(st);
4971 free_mdstat(mdstat);
4972 sysfs_free(cc);
4973 free(subarray);
4974
4975 return ret_val;
4976 }
4977
4978 int Grow_continue(int mdfd, struct supertype *st, struct mdinfo *info,
4979 char *backup_file, int forked, int freeze_reshape)
4980 {
4981 int ret_val = 2;
4982
4983 if (!info->reshape_active)
4984 return ret_val;
4985
4986 if (st->ss->external) {
4987 int cfd = open_dev(st->container_devnm);
4988
4989 if (cfd < 0)
4990 return 1;
4991
4992 st->ss->load_container(st, cfd, st->container_devnm);
4993 close(cfd);
4994 ret_val = reshape_container(st->container_devnm, NULL, mdfd,
4995 st, info, 0, backup_file,
4996 0, forked,
4997 1 | info->reshape_active,
4998 freeze_reshape);
4999 } else
5000 ret_val = reshape_array(NULL, mdfd, "array", st, info, 1,
5001 NULL, INVALID_SECTORS,
5002 backup_file, 0, forked,
5003 1 | info->reshape_active,
5004 freeze_reshape);
5005
5006 return ret_val;
5007 }
5008
5009 char *make_backup(char *name)
5010 {
5011 char *base = "backup_file-";
5012 int len;
5013 char *fname;
5014
5015 len = strlen(MAP_DIR) + 1 + strlen(base) + strlen(name)+1;
5016 fname = xmalloc(len);
5017 sprintf(fname, "%s/%s%s", MAP_DIR, base, name);
5018 return fname;
5019 }
5020
5021 char *locate_backup(char *name)
5022 {
5023 char *fl = make_backup(name);
5024 struct stat stb;
5025
5026 if (stat(fl, &stb) == 0 &&
5027 S_ISREG(stb.st_mode))
5028 return fl;
5029
5030 free(fl);
5031 return NULL;
5032 }
Unnamed repository; edit this file 'description' to name the repository.