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Commit | Line | Data |
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e5329c37 NB |
1 | /* |
2 | * mdadm - manage Linux "md" devices aka RAID arrays. | |
3 | * | |
e736b623 | 4 | * Copyright (C) 2001-2009 Neil Brown <neilb@suse.de> |
e5329c37 NB |
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 | |
e736b623 | 22 | * Email: <neilb@suse.de> |
e5329c37 NB |
23 | */ |
24 | #include "mdadm.h" | |
25 | #include "dlink.h" | |
7236ee7a | 26 | #include <sys/mman.h> |
e5329c37 NB |
27 | |
28 | #if ! defined(__BIG_ENDIAN) && ! defined(__LITTLE_ENDIAN) | |
29 | #error no endian defined | |
30 | #endif | |
31 | #include "md_u.h" | |
32 | #include "md_p.h" | |
33 | ||
e9e43ec3 N |
34 | #ifndef offsetof |
35 | #define offsetof(t,f) ((size_t)&(((t*)0)->f)) | |
36 | #endif | |
37 | ||
e5329c37 NB |
38 | int Grow_Add_device(char *devname, int fd, char *newdev) |
39 | { | |
40 | /* Add a device to an active array. | |
41 | * Currently, just extend a linear array. | |
42 | * This requires writing a new superblock on the | |
43 | * new device, calling the kernel to add the device, | |
44 | * and if that succeeds, update the superblock on | |
45 | * all other devices. | |
46 | * This means that we need to *find* all other devices. | |
47 | */ | |
4b1ac34b NB |
48 | struct mdinfo info; |
49 | ||
e5329c37 NB |
50 | struct stat stb; |
51 | int nfd, fd2; | |
52 | int d, nd; | |
82d9eba6 | 53 | struct supertype *st = NULL; |
aba69144 | 54 | |
e5329c37 | 55 | |
4b1ac34b | 56 | if (ioctl(fd, GET_ARRAY_INFO, &info.array) < 0) { |
e5329c37 NB |
57 | fprintf(stderr, Name ": cannot get array info for %s\n", devname); |
58 | return 1; | |
59 | } | |
60 | ||
1686dc25 | 61 | st = super_by_fd(fd); |
82d9eba6 | 62 | if (!st) { |
f9ce90ba NB |
63 | fprintf(stderr, Name ": cannot handle arrays with superblock version %d\n", info.array.major_version); |
64 | return 1; | |
65 | } | |
66 | ||
4b1ac34b | 67 | if (info.array.level != -1) { |
e5329c37 NB |
68 | fprintf(stderr, Name ": can only add devices to linear arrays\n"); |
69 | return 1; | |
70 | } | |
71 | ||
6416d527 | 72 | nfd = open(newdev, O_RDWR|O_EXCL|O_DIRECT); |
e5329c37 NB |
73 | if (nfd < 0) { |
74 | fprintf(stderr, Name ": cannot open %s\n", newdev); | |
75 | return 1; | |
76 | } | |
77 | fstat(nfd, &stb); | |
78 | if ((stb.st_mode & S_IFMT) != S_IFBLK) { | |
79 | fprintf(stderr, Name ": %s is not a block device!\n", newdev); | |
80 | close(nfd); | |
81 | return 1; | |
82 | } | |
83 | /* now check out all the devices and make sure we can read the superblock */ | |
4b1ac34b | 84 | for (d=0 ; d < info.array.raid_disks ; d++) { |
e5329c37 NB |
85 | mdu_disk_info_t disk; |
86 | char *dv; | |
87 | ||
88 | disk.number = d; | |
89 | if (ioctl(fd, GET_DISK_INFO, &disk) < 0) { | |
90 | fprintf(stderr, Name ": cannot get device detail for device %d\n", | |
91 | d); | |
92 | return 1; | |
93 | } | |
16c6fa80 | 94 | dv = map_dev(disk.major, disk.minor, 1); |
e5329c37 NB |
95 | if (!dv) { |
96 | fprintf(stderr, Name ": cannot find device file for device %d\n", | |
97 | d); | |
98 | return 1; | |
99 | } | |
16c6fa80 | 100 | fd2 = dev_open(dv, O_RDWR); |
e5329c37 NB |
101 | if (!fd2) { |
102 | fprintf(stderr, Name ": cannot open device file %s\n", dv); | |
103 | return 1; | |
104 | } | |
3da92f27 NB |
105 | st->ss->free_super(st); |
106 | ||
107 | if (st->ss->load_super(st, fd2, NULL)) { | |
e5329c37 NB |
108 | fprintf(stderr, Name ": cannot find super block on %s\n", dv); |
109 | close(fd2); | |
110 | return 1; | |
111 | } | |
112 | close(fd2); | |
113 | } | |
114 | /* Ok, looks good. Lets update the superblock and write it out to | |
115 | * newdev. | |
116 | */ | |
aba69144 | 117 | |
4b1ac34b NB |
118 | info.disk.number = d; |
119 | info.disk.major = major(stb.st_rdev); | |
120 | info.disk.minor = minor(stb.st_rdev); | |
121 | info.disk.raid_disk = d; | |
122 | info.disk.state = (1 << MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE); | |
3da92f27 | 123 | st->ss->update_super(st, &info, "linear-grow-new", newdev, |
f752781f | 124 | 0, 0, NULL); |
e5329c37 | 125 | |
3da92f27 | 126 | if (st->ss->store_super(st, nfd)) { |
f752781f NB |
127 | fprintf(stderr, Name ": Cannot store new superblock on %s\n", |
128 | newdev); | |
e5329c37 NB |
129 | close(nfd); |
130 | return 1; | |
131 | } | |
e5329c37 | 132 | close(nfd); |
4b1ac34b NB |
133 | |
134 | if (ioctl(fd, ADD_NEW_DISK, &info.disk) != 0) { | |
e5329c37 NB |
135 | fprintf(stderr, Name ": Cannot add new disk to this array\n"); |
136 | return 1; | |
137 | } | |
138 | /* Well, that seems to have worked. | |
139 | * Now go through and update all superblocks | |
140 | */ | |
141 | ||
4b1ac34b | 142 | if (ioctl(fd, GET_ARRAY_INFO, &info.array) < 0) { |
e5329c37 NB |
143 | fprintf(stderr, Name ": cannot get array info for %s\n", devname); |
144 | return 1; | |
145 | } | |
146 | ||
147 | nd = d; | |
4b1ac34b | 148 | for (d=0 ; d < info.array.raid_disks ; d++) { |
e5329c37 NB |
149 | mdu_disk_info_t disk; |
150 | char *dv; | |
151 | ||
152 | disk.number = d; | |
153 | if (ioctl(fd, GET_DISK_INFO, &disk) < 0) { | |
154 | fprintf(stderr, Name ": cannot get device detail for device %d\n", | |
155 | d); | |
156 | return 1; | |
157 | } | |
16c6fa80 | 158 | dv = map_dev(disk.major, disk.minor, 1); |
e5329c37 NB |
159 | if (!dv) { |
160 | fprintf(stderr, Name ": cannot find device file for device %d\n", | |
161 | d); | |
162 | return 1; | |
163 | } | |
16c6fa80 | 164 | fd2 = dev_open(dv, O_RDWR); |
e5329c37 NB |
165 | if (fd2 < 0) { |
166 | fprintf(stderr, Name ": cannot open device file %s\n", dv); | |
167 | return 1; | |
168 | } | |
3da92f27 | 169 | if (st->ss->load_super(st, fd2, NULL)) { |
e5329c37 NB |
170 | fprintf(stderr, Name ": cannot find super block on %s\n", dv); |
171 | close(fd); | |
172 | return 1; | |
173 | } | |
4b1ac34b NB |
174 | info.array.raid_disks = nd+1; |
175 | info.array.nr_disks = nd+1; | |
176 | info.array.active_disks = nd+1; | |
177 | info.array.working_disks = nd+1; | |
f752781f | 178 | |
3da92f27 | 179 | st->ss->update_super(st, &info, "linear-grow-update", dv, |
f752781f | 180 | 0, 0, NULL); |
aba69144 | 181 | |
3da92f27 | 182 | if (st->ss->store_super(st, fd2)) { |
e5329c37 NB |
183 | fprintf(stderr, Name ": Cannot store new superblock on %s\n", dv); |
184 | close(fd2); | |
185 | return 1; | |
186 | } | |
187 | close(fd2); | |
188 | } | |
189 | ||
190 | return 0; | |
191 | } | |
f5e166fe | 192 | |
8fac0577 | 193 | int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int write_behind, int force) |
f5e166fe NB |
194 | { |
195 | /* | |
196 | * First check that array doesn't have a bitmap | |
197 | * Then create the bitmap | |
198 | * Then add it | |
199 | * | |
200 | * For internal bitmaps, we need to check the version, | |
201 | * find all the active devices, and write the bitmap block | |
202 | * to all devices | |
203 | */ | |
204 | mdu_bitmap_file_t bmf; | |
205 | mdu_array_info_t array; | |
206 | struct supertype *st; | |
dcec9ee5 NB |
207 | int major = BITMAP_MAJOR_HI; |
208 | int vers = md_get_version(fd); | |
8fac0577 | 209 | unsigned long long bitmapsize, array_size; |
dcec9ee5 NB |
210 | |
211 | if (vers < 9003) { | |
212 | major = BITMAP_MAJOR_HOSTENDIAN; | |
213 | #ifdef __BIG_ENDIAN | |
214 | fprintf(stderr, Name ": Warning - bitmaps created on this kernel are not portable\n" | |
215 | " between different architectured. Consider upgrading the Linux kernel.\n"); | |
216 | #endif | |
217 | } | |
f5e166fe NB |
218 | |
219 | if (ioctl(fd, GET_BITMAP_FILE, &bmf) != 0) { | |
353632d9 | 220 | if (errno == ENOMEM) |
f5e166fe NB |
221 | fprintf(stderr, Name ": Memory allocation failure.\n"); |
222 | else | |
223 | fprintf(stderr, Name ": bitmaps not supported by this kernel.\n"); | |
224 | return 1; | |
225 | } | |
226 | if (bmf.pathname[0]) { | |
fe80f49b NB |
227 | if (strcmp(file,"none")==0) { |
228 | if (ioctl(fd, SET_BITMAP_FILE, -1)!= 0) { | |
229 | fprintf(stderr, Name ": failed to remove bitmap %s\n", | |
230 | bmf.pathname); | |
231 | return 1; | |
232 | } | |
233 | return 0; | |
234 | } | |
f5e166fe NB |
235 | fprintf(stderr, Name ": %s already has a bitmap (%s)\n", |
236 | devname, bmf.pathname); | |
237 | return 1; | |
238 | } | |
239 | if (ioctl(fd, GET_ARRAY_INFO, &array) != 0) { | |
240 | fprintf(stderr, Name ": cannot get array status for %s\n", devname); | |
241 | return 1; | |
242 | } | |
243 | if (array.state & (1<<MD_SB_BITMAP_PRESENT)) { | |
fe80f49b NB |
244 | if (strcmp(file, "none")==0) { |
245 | array.state &= ~(1<<MD_SB_BITMAP_PRESENT); | |
246 | if (ioctl(fd, SET_ARRAY_INFO, &array)!= 0) { | |
247 | fprintf(stderr, Name ": failed to remove internal bitmap.\n"); | |
248 | return 1; | |
249 | } | |
250 | return 0; | |
251 | } | |
f5e166fe NB |
252 | fprintf(stderr, Name ": Internal bitmap already present on %s\n", |
253 | devname); | |
254 | return 1; | |
255 | } | |
5b28bd56 NB |
256 | if (array.level <= 0) { |
257 | fprintf(stderr, Name ": Bitmaps not meaningful with level %s\n", | |
258 | map_num(pers, array.level)?:"of this array"); | |
259 | return 1; | |
260 | } | |
8fac0577 NB |
261 | bitmapsize = array.size; |
262 | bitmapsize <<= 1; | |
beae1dfe | 263 | if (get_dev_size(fd, NULL, &array_size) && |
8fac0577 NB |
264 | array_size > (0x7fffffffULL<<9)) { |
265 | /* Array is big enough that we cannot trust array.size | |
266 | * try other approaches | |
267 | */ | |
268 | bitmapsize = get_component_size(fd); | |
269 | } | |
8fac0577 NB |
270 | if (bitmapsize == 0) { |
271 | fprintf(stderr, Name ": Cannot reliably determine size of array to create bitmap - sorry.\n"); | |
272 | return 1; | |
273 | } | |
274 | ||
f9c25f1d | 275 | if (array.level == 10) { |
8686f3ed | 276 | int ncopies = (array.layout&255)*((array.layout>>8)&255); |
f9c25f1d NB |
277 | bitmapsize = bitmapsize * array.raid_disks / ncopies; |
278 | } | |
279 | ||
1686dc25 | 280 | st = super_by_fd(fd); |
f5e166fe NB |
281 | if (!st) { |
282 | fprintf(stderr, Name ": Cannot understand version %d.%d\n", | |
283 | array.major_version, array.minor_version); | |
284 | return 1; | |
285 | } | |
fe80f49b NB |
286 | if (strcmp(file, "none") == 0) { |
287 | fprintf(stderr, Name ": no bitmap found on %s\n", devname); | |
288 | return 1; | |
289 | } else if (strcmp(file, "internal") == 0) { | |
f5e166fe | 290 | int d; |
ea329559 | 291 | for (d=0; d< st->max_devs; d++) { |
f5e166fe NB |
292 | mdu_disk_info_t disk; |
293 | char *dv; | |
294 | disk.number = d; | |
295 | if (ioctl(fd, GET_DISK_INFO, &disk) < 0) | |
296 | continue; | |
297 | if (disk.major == 0 && | |
298 | disk.minor == 0) | |
299 | continue; | |
300 | if ((disk.state & (1<<MD_DISK_SYNC))==0) | |
301 | continue; | |
16c6fa80 | 302 | dv = map_dev(disk.major, disk.minor, 1); |
f5e166fe | 303 | if (dv) { |
16c6fa80 | 304 | int fd2 = dev_open(dv, O_RDWR); |
f5e166fe NB |
305 | if (fd2 < 0) |
306 | continue; | |
3da92f27 | 307 | if (st->ss->load_super(st, fd2, NULL)==0) { |
199171a2 | 308 | if (st->ss->add_internal_bitmap( |
3da92f27 | 309 | st, |
199171a2 NB |
310 | &chunk, delay, write_behind, |
311 | bitmapsize, 0, major) | |
312 | ) | |
3da92f27 | 313 | st->ss->write_bitmap(st, fd2); |
21e92547 NB |
314 | else { |
315 | fprintf(stderr, Name ": failed to create internal bitmap - chunksize problem.\n"); | |
316 | close(fd2); | |
317 | return 1; | |
318 | } | |
f5e166fe NB |
319 | } |
320 | close(fd2); | |
321 | } | |
322 | } | |
323 | array.state |= (1<<MD_SB_BITMAP_PRESENT); | |
324 | if (ioctl(fd, SET_ARRAY_INFO, &array)!= 0) { | |
325 | fprintf(stderr, Name ": failed to set internal bitmap.\n"); | |
326 | return 1; | |
327 | } | |
fe80f49b NB |
328 | } else { |
329 | int uuid[4]; | |
330 | int bitmap_fd; | |
331 | int d; | |
332 | int max_devs = st->max_devs; | |
fe80f49b NB |
333 | |
334 | /* try to load a superblock */ | |
335 | for (d=0; d<max_devs; d++) { | |
336 | mdu_disk_info_t disk; | |
337 | char *dv; | |
338 | int fd2; | |
339 | disk.number = d; | |
340 | if (ioctl(fd, GET_DISK_INFO, &disk) < 0) | |
341 | continue; | |
342 | if ((disk.major==0 && disk.minor==0) || | |
343 | (disk.state & (1<<MD_DISK_REMOVED))) | |
344 | continue; | |
16c6fa80 | 345 | dv = map_dev(disk.major, disk.minor, 1); |
fe80f49b | 346 | if (!dv) continue; |
16c6fa80 | 347 | fd2 = dev_open(dv, O_RDONLY); |
fe80f49b | 348 | if (fd2 >= 0 && |
3da92f27 | 349 | st->ss->load_super(st, fd2, NULL) == 0) { |
fe80f49b | 350 | close(fd2); |
3da92f27 | 351 | st->ss->uuid_from_super(st, uuid); |
fe80f49b NB |
352 | break; |
353 | } | |
354 | close(fd2); | |
355 | } | |
356 | if (d == max_devs) { | |
357 | fprintf(stderr, Name ": cannot find UUID for array!\n"); | |
358 | return 1; | |
359 | } | |
8fac0577 | 360 | if (CreateBitmap(file, force, (char*)uuid, chunk, |
f9c25f1d | 361 | delay, write_behind, bitmapsize, major)) { |
fe80f49b NB |
362 | return 1; |
363 | } | |
364 | bitmap_fd = open(file, O_RDWR); | |
365 | if (bitmap_fd < 0) { | |
8fac0577 | 366 | fprintf(stderr, Name ": weird: %s cannot be opened\n", |
fe80f49b NB |
367 | file); |
368 | return 1; | |
369 | } | |
370 | if (ioctl(fd, SET_BITMAP_FILE, bitmap_fd) < 0) { | |
371 | fprintf(stderr, Name ": Cannot set bitmap file for %s: %s\n", | |
372 | devname, strerror(errno)); | |
373 | return 1; | |
374 | } | |
375 | } | |
f5e166fe NB |
376 | |
377 | return 0; | |
378 | } | |
379 | ||
e86c9dd6 NB |
380 | |
381 | /* | |
382 | * When reshaping an array we might need to backup some data. | |
383 | * This is written to all spares with a 'super_block' describing it. | |
ff94fb86 | 384 | * The superblock goes 4K from the end of the used space on the |
e86c9dd6 NB |
385 | * device. |
386 | * It if written after the backup is complete. | |
387 | * It has the following structure. | |
388 | */ | |
389 | ||
5fdf37e3 | 390 | static struct mdp_backup_super { |
7236ee7a | 391 | char magic[16]; /* md_backup_data-1 or -2 */ |
e86c9dd6 NB |
392 | __u8 set_uuid[16]; |
393 | __u64 mtime; | |
394 | /* start/sizes in 512byte sectors */ | |
7236ee7a | 395 | __u64 devstart; /* address on backup device/file of data */ |
e86c9dd6 NB |
396 | __u64 arraystart; |
397 | __u64 length; | |
398 | __u32 sb_csum; /* csum of preceeding bytes. */ | |
7236ee7a N |
399 | __u32 pad1; |
400 | __u64 devstart2; /* offset in to data of second section */ | |
401 | __u64 arraystart2; | |
402 | __u64 length2; | |
403 | __u32 sb_csum2; /* csum of preceeding bytes. */ | |
404 | __u8 pad[512-68-32]; | |
5fdf37e3 | 405 | } __attribute__((aligned(512))) bsb, bsb2; |
e86c9dd6 NB |
406 | |
407 | int bsb_csum(char *buf, int len) | |
408 | { | |
409 | int i; | |
410 | int csum = 0; | |
411 | for (i=0; i<len; i++) | |
412 | csum = (csum<<3) + buf[0]; | |
413 | return __cpu_to_le32(csum); | |
414 | } | |
415 | ||
7236ee7a N |
416 | static int child_grow(int afd, struct mdinfo *sra, unsigned long blocks, |
417 | int *fds, unsigned long long *offsets, | |
418 | int disks, int chunk, int level, int layout, int data, | |
419 | int dests, int *destfd, unsigned long long *destoffsets); | |
420 | static int child_shrink(int afd, struct mdinfo *sra, unsigned long blocks, | |
421 | int *fds, unsigned long long *offsets, | |
422 | int disks, int chunk, int level, int layout, int data, | |
423 | int dests, int *destfd, unsigned long long *destoffsets); | |
424 | static int child_same_size(int afd, struct mdinfo *sra, unsigned long blocks, | |
425 | int *fds, unsigned long long *offsets, | |
e9e43ec3 | 426 | unsigned long long start, |
7236ee7a N |
427 | int disks, int chunk, int level, int layout, int data, |
428 | int dests, int *destfd, unsigned long long *destoffsets); | |
429 | ||
430 | int freeze_array(struct mdinfo *sra) | |
431 | { | |
432 | /* Try to freeze resync on this array. | |
433 | * Return -1 if the array is busy, | |
434 | * return 0 if this kernel doesn't support 'frozen' | |
435 | * return 1 if it worked. | |
436 | */ | |
437 | char buf[20]; | |
438 | if (sysfs_get_str(sra, NULL, "sync_action", buf, 20) <= 0) | |
439 | return 0; | |
440 | if (strcmp(buf, "idle\n") != 0 && | |
441 | strcmp(buf, "frozen\n") != 0) | |
442 | return -1; | |
443 | if (sysfs_set_str(sra, NULL, "sync_action", "frozen") < 0) | |
444 | return 0; | |
445 | return 1; | |
446 | } | |
447 | ||
448 | void unfreeze_array(struct mdinfo *sra, int frozen) | |
449 | { | |
450 | /* If 'frozen' is 1, unfreeze the array */ | |
451 | if (frozen > 0) | |
452 | sysfs_set_str(sra, NULL, "sync_action", "idle"); | |
453 | } | |
454 | ||
455 | void wait_reshape(struct mdinfo *sra) | |
456 | { | |
457 | int fd = sysfs_get_fd(sra, NULL, "sync_action"); | |
458 | char action[20]; | |
459 | ||
460 | do { | |
461 | fd_set rfds; | |
462 | FD_ZERO(&rfds); | |
463 | FD_SET(fd, &rfds); | |
464 | select(fd+1, NULL, NULL, &rfds, NULL); | |
465 | ||
466 | if (sysfs_fd_get_str(fd, action, 20) < 0) { | |
467 | close(fd); | |
468 | return; | |
469 | } | |
470 | } while (strncmp(action, "reshape", 7) == 0); | |
471 | } | |
472 | ||
473 | ||
06b0d786 | 474 | int Grow_reshape(char *devname, int fd, int quiet, char *backup_file, |
e86c9dd6 | 475 | long long size, |
19678e53 | 476 | int level, char *layout_str, int chunksize, int raid_disks) |
e86c9dd6 NB |
477 | { |
478 | /* Make some changes in the shape of an array. | |
479 | * The kernel must support the change. | |
7236ee7a N |
480 | * |
481 | * There are three different changes. Each can trigger | |
482 | * a resync or recovery so we freeze that until we have | |
483 | * requested everything (if kernel supports freezing - 2.6.30). | |
484 | * The steps are: | |
485 | * - change size (i.e. component_size) | |
486 | * - change level | |
487 | * - change layout/chunksize/ndisks | |
488 | * | |
489 | * The last can require a reshape. It is different on different | |
490 | * levels so we need to check the level before actioning it. | |
491 | * Some times the level change needs to be requested after the | |
492 | * reshape (e.g. raid6->raid5, raid5->raid0) | |
493 | * | |
e86c9dd6 | 494 | */ |
7236ee7a | 495 | struct mdu_array_info_s array, orig; |
e86c9dd6 | 496 | char *c; |
7236ee7a | 497 | int rv = 0; |
e86c9dd6 NB |
498 | struct supertype *st; |
499 | ||
e86c9dd6 NB |
500 | int nchunk, ochunk; |
501 | int nlayout, olayout; | |
502 | int ndisks, odisks; | |
503 | int ndata, odata; | |
7236ee7a N |
504 | int orig_level = UnSet; |
505 | char alt_layout[40]; | |
e86c9dd6 NB |
506 | int *fdlist; |
507 | unsigned long long *offsets; | |
7236ee7a | 508 | int d, i; |
e86c9dd6 NB |
509 | int nrdisks; |
510 | int err; | |
7236ee7a N |
511 | int frozen; |
512 | unsigned long a,b, blocks, stripes; | |
513 | int cache; | |
514 | unsigned long long array_size; | |
515 | int changed = 0; | |
516 | int done; | |
e86c9dd6 | 517 | |
7e0f6979 | 518 | struct mdinfo *sra; |
06c7f68e | 519 | struct mdinfo *sd; |
e86c9dd6 NB |
520 | |
521 | if (ioctl(fd, GET_ARRAY_INFO, &array) < 0) { | |
522 | fprintf(stderr, Name ": %s is not an active md array - aborting\n", | |
523 | devname); | |
524 | return 1; | |
525 | } | |
24d40069 | 526 | |
9ce510be N |
527 | if (size >= 0 && |
528 | (chunksize || level!= UnSet || layout_str || raid_disks)) { | |
529 | fprintf(stderr, Name ": cannot change component size at the same time " | |
530 | "as other changes.\n" | |
531 | " Change size first, then check data is intact before " | |
532 | "making other changes.\n"); | |
533 | return 1; | |
534 | } | |
535 | ||
24d40069 N |
536 | if (raid_disks && raid_disks < array.raid_disks && array.level > 1 && |
537 | get_linux_version() < 2006032 && | |
538 | !check_env("MDADM_FORCE_FEWER")) { | |
539 | fprintf(stderr, Name ": reducing the number of devices is not safe before Linux 2.6.32\n" | |
540 | " Please use a newer kernel\n"); | |
541 | return 1; | |
542 | } | |
7236ee7a N |
543 | sra = sysfs_read(fd, 0, GET_LEVEL); |
544 | frozen = freeze_array(sra); | |
545 | if (frozen < 0) { | |
546 | fprintf(stderr, Name ": %s is performing resync/recovery and cannot" | |
547 | " be reshaped\n", devname); | |
548 | return 1; | |
549 | } | |
550 | ||
551 | /* ========= set size =============== */ | |
552 | if (size >= 0 && (size == 0 || size != array.size)) { | |
553 | array.size = size; | |
554 | if (array.size != size) { | |
555 | /* got truncated to 32bit, write to | |
556 | * component_size instead | |
557 | */ | |
558 | if (sra) | |
559 | rv = sysfs_set_num(sra, NULL, | |
560 | "component_size", size); | |
561 | else | |
562 | rv = -1; | |
563 | } else | |
564 | rv = ioctl(fd, SET_ARRAY_INFO, &array); | |
565 | if (rv != 0) { | |
566 | fprintf(stderr, Name ": Cannot set device size for %s: %s\n", | |
567 | devname, strerror(errno)); | |
568 | rv = 1; | |
569 | goto release; | |
570 | } | |
571 | ioctl(fd, GET_ARRAY_INFO, &array); | |
572 | if (!quiet) | |
573 | fprintf(stderr, Name ": component size of %s has been set to %dK\n", | |
574 | devname, array.size); | |
575 | changed = 1; | |
576 | } | |
577 | ||
578 | /* ======= set level =========== */ | |
579 | if (level != UnSet && level != array.level) { | |
580 | /* Trying to change the level. | |
581 | * We might need to change layout first and schedule a | |
582 | * level change for later. | |
583 | * Level changes that can happen immediately are: | |
584 | * 0->4,5,6 1->5 4->5,6 5->1,6 | |
585 | * Level changes that need a layout change first are: | |
586 | * 6->5,4,0 : need a -6 layout, or parity-last | |
587 | * 5->4,0 : need parity-last | |
588 | */ | |
589 | if ((array.level == 6 || array.level == 5) && | |
590 | (level == 5 || level == 4 || level == 0)) { | |
591 | /* Don't change level yet, but choose intermediate | |
592 | * layout | |
593 | */ | |
594 | if (level == 5) { | |
595 | if (layout_str == NULL) | |
596 | switch (array.layout) { | |
597 | case ALGORITHM_LEFT_ASYMMETRIC: | |
598 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
599 | case ALGORITHM_ROTATING_N_RESTART: | |
600 | layout_str = "left-asymmetric-6"; | |
601 | break; | |
602 | case ALGORITHM_LEFT_SYMMETRIC: | |
603 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
604 | case ALGORITHM_ROTATING_N_CONTINUE: | |
605 | layout_str = "left-symmetric-6"; | |
606 | break; | |
607 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
608 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
609 | case ALGORITHM_ROTATING_ZERO_RESTART: | |
610 | layout_str = "right-asymmetric-6"; | |
611 | break; | |
612 | case ALGORITHM_RIGHT_SYMMETRIC: | |
613 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
614 | layout_str = "right-symmetric-6"; | |
615 | break; | |
616 | case ALGORITHM_PARITY_0: | |
617 | case ALGORITHM_PARITY_0_6: | |
618 | layout_str = "parity-first-6"; | |
619 | break; | |
620 | case ALGORITHM_PARITY_N: | |
621 | layout_str = "parity-last"; | |
622 | break; | |
623 | default: | |
624 | fprintf(stderr, Name ": %s: cannot" | |
625 | "convert layout to RAID5 equivalent\n", | |
626 | devname); | |
627 | rv = 1; | |
628 | goto release; | |
629 | } | |
630 | else { | |
631 | int l = map_name(r5layout, layout_str); | |
632 | if (l == UnSet) { | |
633 | fprintf(stderr, Name ": %s: layout '%s' not recognised\n", | |
634 | devname, layout_str); | |
635 | rv = 1; | |
636 | goto release; | |
637 | } | |
638 | if (l != ALGORITHM_PARITY_N) { | |
639 | /* need the -6 version */ | |
640 | char *ls = map_num(r5layout, l); | |
641 | strcat(strcpy(alt_layout, ls), | |
642 | "-6"); | |
643 | layout_str = alt_layout; | |
644 | } | |
645 | } | |
646 | if (raid_disks) | |
24d40069 | 647 | /* The final raid6->raid5 conversion |
7236ee7a N |
648 | * will reduce the number of disks, |
649 | * so now we need to aim higher | |
650 | */ | |
651 | raid_disks++; | |
652 | } else | |
653 | layout_str = "parity-last"; | |
654 | } else { | |
655 | c = map_num(pers, level); | |
b5ea446a N |
656 | if (c == NULL) { |
657 | rv = 1;/* not possible */ | |
658 | goto release; | |
659 | } | |
7236ee7a N |
660 | err = sysfs_set_str(sra, NULL, "level", c); |
661 | if (err) { | |
662 | fprintf(stderr, Name ": %s: could not set level to %s\n", | |
663 | devname, c); | |
664 | rv = 1; | |
665 | goto release; | |
666 | } | |
667 | orig = array; | |
668 | orig_level = orig.level; | |
669 | ioctl(fd, GET_ARRAY_INFO, &array); | |
670 | if (layout_str == NULL && | |
671 | orig.level == 5 && level == 6 && | |
672 | array.layout != orig.layout) | |
673 | layout_str = map_num(r5layout, orig.layout); | |
674 | if (!quiet) | |
675 | fprintf(stderr, Name " level of %s changed to %s\n", | |
676 | devname, c); | |
677 | changed = 1; | |
678 | } | |
679 | } | |
680 | ||
681 | /* ========= set shape (chunk_size / layout / ndisks) ============== */ | |
682 | /* Check if layout change is a no-op */ | |
683 | if (layout_str) switch(array.level) { | |
684 | case 5: | |
685 | if (array.layout == map_name(r5layout, layout_str)) | |
686 | layout_str = NULL; | |
687 | break; | |
688 | case 6: | |
689 | if (layout_str == NULL && | |
690 | ((chunksize && chunksize * 1024 != array.chunk_size) || | |
691 | (raid_disks && raid_disks != array.raid_disks)) && | |
692 | array.layout >= 16) { | |
693 | fprintf(stderr, Name | |
694 | ": %s has a non-standard layout. If you wish to preserve this\n" | |
695 | " during the reshape, please specify --layout=preserve\n" | |
696 | " If you want to change it, specify a layout or use --layout=normalise\n", | |
697 | devname); | |
698 | rv = 1; | |
699 | goto release; | |
700 | } | |
701 | if (strcmp(layout_str, "normalise") == 0 || | |
702 | strcmp(layout_str, "normalize") == 0) { | |
703 | char *hyphen; | |
704 | strcpy(alt_layout, map_num(r6layout, array.layout)); | |
705 | hyphen = strrchr(alt_layout, '-'); | |
706 | if (hyphen && strcmp(hyphen, "-6") == 0) { | |
707 | *hyphen = 0; | |
708 | layout_str = alt_layout; | |
709 | } | |
710 | } | |
711 | ||
712 | if (array.layout == map_name(r6layout, layout_str)) | |
713 | layout_str = NULL; | |
714 | if (layout_str && strcmp(layout_str, "preserve") == 0) | |
715 | layout_str = NULL; | |
716 | break; | |
717 | } | |
718 | if (layout_str == NULL | |
719 | && (chunksize == 0 || chunksize*1024 == array.chunk_size) | |
720 | && (raid_disks == 0 || raid_disks == array.raid_disks)) { | |
721 | rv = 0; | |
722 | if (level != UnSet && level != array.level) { | |
723 | /* Looks like this level change doesn't need | |
724 | * a reshape after all. | |
725 | */ | |
726 | c = map_num(pers, level); | |
727 | if (c) { | |
728 | rv = sysfs_set_str(sra, NULL, "level", c); | |
729 | if (rv) | |
730 | fprintf(stderr, Name ": %s: could not set level to %s\n", | |
731 | devname, c); | |
732 | } | |
733 | } else if (!changed && !quiet) | |
734 | fprintf(stderr, Name ": %s: no change requested\n", | |
735 | devname); | |
736 | goto release; | |
737 | } | |
738 | ||
e86c9dd6 NB |
739 | c = map_num(pers, array.level); |
740 | if (c == NULL) c = "-unknown-"; | |
741 | switch(array.level) { | |
742 | default: /* raid0, linear, multipath cannot be reconfigured */ | |
743 | fprintf(stderr, Name ": %s array %s cannot be reshaped.\n", | |
744 | c, devname); | |
7236ee7a N |
745 | rv = 1; |
746 | break; | |
e86c9dd6 NB |
747 | |
748 | case LEVEL_FAULTY: /* only 'layout' change is permitted */ | |
749 | ||
e86c9dd6 NB |
750 | if (chunksize || raid_disks) { |
751 | fprintf(stderr, Name ": %s: Cannot change chunksize or disks of a 'faulty' array\n", | |
752 | devname); | |
7236ee7a N |
753 | rv = 1; |
754 | break; | |
e86c9dd6 | 755 | } |
19678e53 | 756 | if (layout_str == NULL) |
7236ee7a | 757 | break; /* nothing to do.... */ |
e86c9dd6 | 758 | |
19678e53 N |
759 | array.layout = parse_layout_faulty(layout_str); |
760 | if (array.layout < 0) { | |
7236ee7a | 761 | int rv; |
19678e53 N |
762 | fprintf(stderr, Name ": %s: layout %s not understood for 'faulty' array\n", |
763 | devname, layout_str); | |
7236ee7a N |
764 | rv = 1; |
765 | break; | |
19678e53 | 766 | } |
e86c9dd6 NB |
767 | if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) { |
768 | fprintf(stderr, Name ": Cannot set layout for %s: %s\n", | |
769 | devname, strerror(errno)); | |
7236ee7a N |
770 | rv = 1; |
771 | } else if (!quiet) | |
e86c9dd6 | 772 | printf("layout for %s set to %d\n", devname, array.layout); |
7236ee7a | 773 | break; |
e86c9dd6 | 774 | |
7236ee7a | 775 | case 1: /* only raid_disks can each be changed. */ |
e86c9dd6 | 776 | |
19678e53 | 777 | if (chunksize || layout_str != NULL) { |
7236ee7a | 778 | fprintf(stderr, Name ": %s: Cannot change chunk size or layout for a RAID1 array.\n", |
e86c9dd6 | 779 | devname); |
7236ee7a N |
780 | rv = 1; |
781 | break; | |
e86c9dd6 | 782 | } |
9860f271 | 783 | if (raid_disks > 0) { |
e86c9dd6 | 784 | array.raid_disks = raid_disks; |
9860f271 NB |
785 | if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) { |
786 | fprintf(stderr, Name ": Cannot set raid-devices for %s: %s\n", | |
787 | devname, strerror(errno)); | |
7236ee7a | 788 | rv = 1; |
9860f271 | 789 | } |
e86c9dd6 | 790 | } |
7236ee7a | 791 | break; |
e86c9dd6 NB |
792 | |
793 | case 4: | |
794 | case 5: | |
795 | case 6: | |
1686dc25 | 796 | |
7236ee7a N |
797 | /* |
798 | * layout/chunksize/raid_disks can be changed | |
e86c9dd6 | 799 | * though the kernel may not support it all. |
e86c9dd6 | 800 | */ |
7236ee7a N |
801 | st = super_by_fd(fd); |
802 | ||
803 | /* | |
804 | * There are three possibilities. | |
805 | * 1/ The array will shrink. | |
806 | * We need to ensure the reshape will pause before reaching | |
807 | * the 'critical section'. We also need to fork and wait for | |
808 | * that to happen. When it does we | |
809 | * suspend/backup/complete/unfreeze | |
810 | * | |
811 | * 2/ The array will not change size. | |
812 | * This requires that we keep a backup of a sliding window | |
813 | * so that we can restore data after a crash. So we need | |
814 | * to fork and monitor progress. | |
815 | * | |
816 | * 3/ The array will grow. This is relatively easy. | |
e86c9dd6 NB |
817 | * However the kernel's restripe routines will cheerfully |
818 | * overwrite some early data before it is safe. So we | |
819 | * need to make a backup of the early parts of the array | |
820 | * and be ready to restore it if rebuild aborts very early. | |
821 | * | |
7236ee7a N |
822 | * We backup data by writing it to one spare, or to a |
823 | * file which was given on command line. | |
e86c9dd6 | 824 | * |
7236ee7a | 825 | * [FOLLOWING IS OLD AND PARTLY WRONG] |
e86c9dd6 NB |
826 | * So: we enumerate the devices in the array and |
827 | * make sure we can open all of them. | |
828 | * Then we freeze the early part of the array and | |
829 | * backup to the various spares. | |
830 | * Then we request changes and start the reshape. | |
831 | * Monitor progress until it has passed the danger zone. | |
832 | * and finally invalidate the copied data and unfreeze the | |
833 | * start of the array. | |
834 | * | |
7236ee7a N |
835 | * In each case, we first make sure that storage is available |
836 | * for the required backup. | |
837 | * Then we: | |
838 | * - request the shape change. | |
839 | * - for to handle backup etc. | |
e86c9dd6 | 840 | */ |
e86c9dd6 NB |
841 | nchunk = ochunk = array.chunk_size; |
842 | nlayout = olayout = array.layout; | |
843 | ndisks = odisks = array.raid_disks; | |
844 | ||
7236ee7a N |
845 | if (chunksize) { |
846 | nchunk = chunksize * 1024; | |
847 | if (array.size % chunksize) { | |
848 | fprintf(stderr, Name ": component size %dK is not" | |
849 | " a multiple of chunksize %dK\n", | |
850 | array.size, chunksize); | |
851 | break; | |
852 | } | |
853 | } | |
19678e53 | 854 | if (layout_str != NULL) |
7236ee7a | 855 | switch(array.level) { |
19678e53 N |
856 | case 4: /* ignore layout */ |
857 | break; | |
858 | case 5: | |
859 | nlayout = map_name(r5layout, layout_str); | |
860 | if (nlayout == UnSet) { | |
861 | fprintf(stderr, Name ": layout %s not understood for raid5.\n", | |
862 | layout_str); | |
b5ea446a N |
863 | rv = 1; |
864 | goto release; | |
19678e53 N |
865 | } |
866 | break; | |
867 | ||
868 | case 6: | |
869 | nlayout = map_name(r6layout, layout_str); | |
870 | if (nlayout == UnSet) { | |
871 | fprintf(stderr, Name ": layout %s not understood for raid6.\n", | |
872 | layout_str); | |
b5ea446a N |
873 | rv = 1; |
874 | goto release; | |
19678e53 N |
875 | } |
876 | break; | |
877 | } | |
e86c9dd6 NB |
878 | if (raid_disks) ndisks = raid_disks; |
879 | ||
880 | odata = odisks-1; | |
e86c9dd6 | 881 | ndata = ndisks-1; |
7236ee7a N |
882 | if (array.level == 6) { |
883 | odata--; /* number of data disks */ | |
884 | ndata--; | |
e86c9dd6 | 885 | } |
7236ee7a | 886 | |
d2505cff N |
887 | if (odata == ndata && |
888 | get_linux_version() < 2006032) { | |
889 | fprintf(stderr, Name ": in-place reshape is not safe before 2.6.32, sorry.\n"); | |
890 | break; | |
891 | } | |
892 | ||
7236ee7a | 893 | /* Check that we can hold all the data */ |
2ed4f753 | 894 | size = ndata * (long long)array.size; |
7236ee7a N |
895 | get_dev_size(fd, NULL, &array_size); |
896 | if (size < (array_size/1024)) { | |
897 | fprintf(stderr, Name ": this change will reduce the size of the array.\n" | |
898 | " use --grow --array-size first to truncate array.\n" | |
899 | " e.g. mdadm --grow %s --array-size %llu\n", | |
900 | devname, size); | |
901 | rv = 1; | |
902 | break; | |
e86c9dd6 | 903 | } |
7236ee7a N |
904 | |
905 | /* So how much do we need to backup. | |
906 | * We need an amount of data which is both a whole number of | |
907 | * old stripes and a whole number of new stripes. | |
908 | * So LCM for (chunksize*datadisks). | |
e86c9dd6 | 909 | */ |
7236ee7a N |
910 | a = ochunk/512 * odata; |
911 | b = nchunk/512 * ndata; | |
912 | /* Find GCD */ | |
913 | while (a != b) { | |
914 | if (a < b) | |
915 | b -= a; | |
916 | if (b < a) | |
917 | a -= b; | |
e86c9dd6 | 918 | } |
7236ee7a N |
919 | /* LCM == product / GCD */ |
920 | blocks = ochunk/512 * nchunk/512 * odata * ndata / a; | |
921 | ||
e380d3be N |
922 | sysfs_free(sra); |
923 | sra = sysfs_read(fd, 0, | |
924 | GET_COMPONENT|GET_DEVS|GET_OFFSET|GET_STATE| | |
925 | GET_CACHE); | |
926 | ||
eba71529 N |
927 | if (ndata == odata) { |
928 | /* Make 'blocks' bigger for better throughput, but | |
929 | * not so big that we reject it below. | |
1b13faf7 | 930 | * Try for 16 megabytes |
eba71529 | 931 | */ |
1b13faf7 N |
932 | while (blocks * 32 < sra->component_size && |
933 | blocks < 16*1024*2) | |
934 | blocks *= 2; | |
eba71529 | 935 | } else |
7236ee7a N |
936 | fprintf(stderr, Name ": Need to backup %luK of critical " |
937 | "section..\n", blocks/2); | |
e86c9dd6 | 938 | |
e86c9dd6 NB |
939 | if (!sra) { |
940 | fprintf(stderr, Name ": %s: Cannot get array details from sysfs\n", | |
941 | devname); | |
7236ee7a N |
942 | rv = 1; |
943 | break; | |
e86c9dd6 NB |
944 | } |
945 | ||
7236ee7a | 946 | if (blocks >= sra->component_size/2) { |
e86c9dd6 NB |
947 | fprintf(stderr, Name ": %s: Something wrong - reshape aborted\n", |
948 | devname); | |
7236ee7a N |
949 | rv = 1; |
950 | break; | |
353632d9 | 951 | } |
7e0f6979 | 952 | nrdisks = array.nr_disks + sra->array.spare_disks; |
e86c9dd6 NB |
953 | /* Now we need to open all these devices so we can read/write. |
954 | */ | |
06b0d786 NB |
955 | fdlist = malloc((1+nrdisks) * sizeof(int)); |
956 | offsets = malloc((1+nrdisks) * sizeof(offsets[0])); | |
e86c9dd6 NB |
957 | if (!fdlist || !offsets) { |
958 | fprintf(stderr, Name ": malloc failed: grow aborted\n"); | |
7236ee7a N |
959 | rv = 1; |
960 | break; | |
e86c9dd6 | 961 | } |
06b0d786 | 962 | for (d=0; d <= nrdisks; d++) |
e86c9dd6 NB |
963 | fdlist[d] = -1; |
964 | d = array.raid_disks; | |
965 | for (sd = sra->devs; sd; sd=sd->next) { | |
06c7f68e | 966 | if (sd->disk.state & (1<<MD_DISK_FAULTY)) |
e86c9dd6 | 967 | continue; |
06c7f68e NB |
968 | if (sd->disk.state & (1<<MD_DISK_SYNC)) { |
969 | char *dn = map_dev(sd->disk.major, | |
970 | sd->disk.minor, 1); | |
971 | fdlist[sd->disk.raid_disk] | |
972 | = dev_open(dn, O_RDONLY); | |
7236ee7a | 973 | offsets[sd->disk.raid_disk] = sd->data_offset*512; |
06c7f68e | 974 | if (fdlist[sd->disk.raid_disk] < 0) { |
e86c9dd6 | 975 | fprintf(stderr, Name ": %s: cannot open component %s\n", |
e81cdd9f | 976 | devname, dn?dn:"-unknown-"); |
7236ee7a N |
977 | rv = 1; |
978 | goto release; | |
e86c9dd6 | 979 | } |
7236ee7a | 980 | } else if (backup_file == NULL) { |
e86c9dd6 | 981 | /* spare */ |
06c7f68e NB |
982 | char *dn = map_dev(sd->disk.major, |
983 | sd->disk.minor, 1); | |
16c6fa80 | 984 | fdlist[d] = dev_open(dn, O_RDWR); |
ff94fb86 | 985 | offsets[d] = (sd->data_offset + sra->component_size - blocks - 8)*512; |
e86c9dd6 NB |
986 | if (fdlist[d]<0) { |
987 | fprintf(stderr, Name ": %s: cannot open component %s\n", | |
e81cdd9f | 988 | devname, dn?dn:"-unknown"); |
7236ee7a N |
989 | rv = 1; |
990 | goto release; | |
e86c9dd6 NB |
991 | } |
992 | d++; | |
993 | } | |
994 | } | |
7236ee7a N |
995 | if (backup_file == NULL) { |
996 | if (ndata <= odata) { | |
997 | fprintf(stderr, Name ": %s: Cannot grow - need backup-file\n", | |
998 | devname); | |
999 | rv = 1; | |
1000 | break; | |
1001 | } else if (sra->array.spare_disks == 0) { | |
1002 | fprintf(stderr, Name ": %s: Cannot grow - need a spare or " | |
1003 | "backup-file to backup critical section\n", | |
1004 | devname); | |
1005 | rv = 1; | |
1006 | break; | |
1007 | } | |
1008 | if (d == array.raid_disks) { | |
1009 | fprintf(stderr, Name ": %s: No spare device for backup\n", | |
1010 | devname); | |
1011 | rv = 1; | |
1012 | break; | |
e86c9dd6 | 1013 | } |
7236ee7a N |
1014 | } else { |
1015 | /* need to check backup file is large enough */ | |
1016 | char buf[512]; | |
1017 | fdlist[d] = open(backup_file, O_RDWR|O_CREAT|O_EXCL, | |
1018 | S_IRUSR | S_IWUSR); | |
1019 | offsets[d] = 8 * 512; | |
06b0d786 NB |
1020 | if (fdlist[d] < 0) { |
1021 | fprintf(stderr, Name ": %s: cannot create backup file %s: %s\n", | |
1022 | devname, backup_file, strerror(errno)); | |
7236ee7a N |
1023 | rv = 1; |
1024 | break; | |
1025 | } | |
1026 | memset(buf, 0, 512); | |
1027 | for (i=0; i < blocks + 1 ; i++) { | |
1028 | if (write(fdlist[d], buf, 512) != 512) { | |
1029 | fprintf(stderr, Name ": %s: cannot create backup file %s: %s\n", | |
1030 | devname, backup_file, strerror(errno)); | |
1031 | rv = 1; | |
1032 | break; | |
1033 | } | |
1034 | } | |
1035 | if (fsync(fdlist[d]) != 0) { | |
1036 | fprintf(stderr, Name ": %s: cannot create backup file %s: %s\n", | |
1037 | devname, backup_file, strerror(errno)); | |
1038 | rv = 1; | |
1039 | break; | |
06b0d786 | 1040 | } |
06b0d786 | 1041 | d++; |
06b0d786 | 1042 | } |
7236ee7a N |
1043 | |
1044 | /* lastly, check that the internal stripe cache is | |
1045 | * large enough, or it won't work. | |
1046 | */ | |
1047 | ||
1048 | cache = (nchunk < ochunk) ? ochunk : nchunk; | |
1049 | cache = cache * 4 / 4096; | |
1b13faf7 N |
1050 | if (cache < blocks / 8 / odisks + 16) |
1051 | /* Make it big enough to hold 'blocks' */ | |
1052 | cache = blocks / 8 / odisks + 16; | |
7236ee7a N |
1053 | if (sra->cache_size < cache) |
1054 | sysfs_set_num(sra, NULL, "stripe_cache_size", | |
1055 | cache+1); | |
1056 | /* Right, everything seems fine. Let's kick things off. | |
1057 | * If only changing raid_disks, use ioctl, else use | |
1058 | * sysfs. | |
1059 | */ | |
1060 | if (ochunk == nchunk && olayout == nlayout) { | |
1061 | array.raid_disks = ndisks; | |
1062 | if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) { | |
1063 | rv = 1; | |
1064 | fprintf(stderr, Name ": Cannot set device shape for %s: %s\n", | |
1065 | devname, strerror(errno)); | |
1066 | if (ndisks < odisks && | |
1067 | get_linux_version() < 2006030) | |
1068 | fprintf(stderr, Name ": linux 2.6.30 or later required\n"); | |
1069 | ||
1070 | break; | |
1071 | } | |
1072 | } else { | |
1073 | /* set them all just in case some old 'new_*' value | |
1074 | * persists from some earlier problem | |
1075 | */ | |
1076 | if (sysfs_set_num(sra, NULL, "chunk_size", nchunk) < 0) | |
1077 | rv = 1; | |
1078 | if (sysfs_set_num(sra, NULL, "layout", nlayout) < 0) | |
1079 | rv = 1; | |
1080 | if (sysfs_set_num(sra, NULL, "raid_disks", ndisks) < 0) | |
1081 | rv = 1; | |
1082 | if (rv) { | |
1083 | fprintf(stderr, Name ": Cannot set device shape for %s\n", | |
1084 | devname); | |
1085 | if (get_linux_version() < 2006030) | |
1086 | fprintf(stderr, Name ": linux 2.6.30 or later required\n"); | |
1087 | break; | |
1088 | } | |
e86c9dd6 NB |
1089 | } |
1090 | ||
7236ee7a N |
1091 | if (ndisks == 2 && odisks == 2) { |
1092 | /* No reshape is needed in this trivial case */ | |
1093 | rv = 0; | |
1094 | break; | |
1095 | } | |
1096 | ||
1097 | /* set up the backup-super-block. This requires the | |
1098 | * uuid from the array. | |
1099 | */ | |
e86c9dd6 | 1100 | /* Find a superblock */ |
7236ee7a N |
1101 | for (sd = sra->devs; sd; sd = sd->next) { |
1102 | char *dn; | |
1103 | int devfd; | |
1104 | int ok; | |
1105 | if (sd->disk.state & (1<<MD_DISK_FAULTY)) | |
1106 | continue; | |
1107 | dn = map_dev(sd->disk.major, sd->disk.minor, 1); | |
1108 | devfd = dev_open(dn, O_RDONLY); | |
1109 | if (devfd < 0) | |
1110 | continue; | |
1111 | ok = st->ss->load_super(st, devfd, NULL); | |
1112 | close(devfd); | |
1113 | if (ok >= 0) | |
1114 | break; | |
1115 | } | |
1116 | if (!sd) { | |
e86c9dd6 NB |
1117 | fprintf(stderr, Name ": %s: Cannot find a superblock\n", |
1118 | devname); | |
7236ee7a N |
1119 | rv = 1; |
1120 | break; | |
e86c9dd6 NB |
1121 | } |
1122 | ||
7236ee7a | 1123 | memset(&bsb, 0, 512); |
2efedc7b | 1124 | memcpy(bsb.magic, "md_backup_data-1", 16); |
3da92f27 | 1125 | st->ss->uuid_from_super(st, (int*)&bsb.set_uuid); |
2efedc7b | 1126 | bsb.mtime = __cpu_to_le64(time(0)); |
7236ee7a N |
1127 | bsb.devstart2 = blocks; |
1128 | stripes = blocks / (ochunk/512) / odata; | |
1129 | /* Now we just need to kick off the reshape and watch, while | |
1130 | * handling backups of the data... | |
1131 | * This is all done by a forked background process. | |
2efedc7b | 1132 | */ |
7236ee7a N |
1133 | switch(fork()) { |
1134 | case 0: | |
1135 | close(fd); | |
1136 | if (check_env("MDADM_GROW_VERIFY")) | |
1137 | fd = open(devname, O_RDONLY | O_DIRECT); | |
1138 | else | |
1139 | fd = -1; | |
1140 | mlockall(MCL_FUTURE); | |
1141 | ||
1142 | if (odata < ndata) | |
1143 | done = child_grow(fd, sra, stripes, | |
1144 | fdlist, offsets, | |
1145 | odisks, ochunk, array.level, olayout, odata, | |
1146 | d - odisks, fdlist+odisks, offsets+odisks); | |
1147 | else if (odata > ndata) | |
1148 | done = child_shrink(fd, sra, stripes, | |
1149 | fdlist, offsets, | |
1150 | odisks, ochunk, array.level, olayout, odata, | |
1151 | d - odisks, fdlist+odisks, offsets+odisks); | |
1152 | else | |
1153 | done = child_same_size(fd, sra, stripes, | |
1154 | fdlist, offsets, | |
e9e43ec3 | 1155 | 0, |
7236ee7a N |
1156 | odisks, ochunk, array.level, olayout, odata, |
1157 | d - odisks, fdlist+odisks, offsets+odisks); | |
1158 | if (backup_file && done) | |
1159 | unlink(backup_file); | |
1160 | if (level != UnSet && level != array.level) { | |
1161 | /* We need to wait for the reshape to finish | |
1162 | * (which will have happened unless odata < ndata) | |
1163 | * and then set the level | |
758d3a8e | 1164 | */ |
7236ee7a N |
1165 | |
1166 | c = map_num(pers, level); | |
1167 | if (c == NULL) | |
1168 | exit(0);/* not possible */ | |
1169 | ||
1170 | if (odata < ndata) | |
1171 | wait_reshape(sra); | |
1172 | err = sysfs_set_str(sra, NULL, "level", c); | |
1173 | if (err) | |
1174 | fprintf(stderr, Name ": %s: could not set level to %s\n", | |
1175 | devname, c); | |
758d3a8e | 1176 | } |
7236ee7a N |
1177 | exit(0); |
1178 | case -1: | |
1179 | fprintf(stderr, Name ": Cannot run child to monitor reshape: %s\n", | |
1180 | strerror(errno)); | |
1181 | rv = 1; | |
1182 | break; | |
1183 | default: | |
1184 | /* The child will take care of unfreezing the array */ | |
1185 | frozen = 0; | |
1186 | break; | |
e86c9dd6 | 1187 | } |
7236ee7a | 1188 | break; |
e86c9dd6 | 1189 | |
7236ee7a | 1190 | } |
e86c9dd6 | 1191 | |
7236ee7a N |
1192 | release: |
1193 | if (rv && orig_level != UnSet && sra) { | |
1194 | c = map_num(pers, orig_level); | |
1195 | if (c && sysfs_set_str(sra, NULL, "level", c) == 0) | |
1196 | fprintf(stderr, Name ": aborting level change\n"); | |
1197 | } | |
1198 | if (sra) | |
1199 | unfreeze_array(sra, frozen); | |
1200 | return rv; | |
1201 | } | |
e86c9dd6 | 1202 | |
7236ee7a N |
1203 | /* |
1204 | * We run a child process in the background which performs the following | |
1205 | * steps: | |
1206 | * - wait for resync to reach a certain point | |
1207 | * - suspend io to the following section | |
1208 | * - backup that section | |
1209 | * - allow resync to proceed further | |
1210 | * - resume io | |
1211 | * - discard the backup. | |
1212 | * | |
1213 | * When are combined in slightly different ways in the three cases. | |
1214 | * Grow: | |
1215 | * - suspend/backup/allow/wait/resume/discard | |
1216 | * Shrink: | |
1217 | * - allow/wait/suspend/backup/allow/wait/resume/discard | |
1218 | * same-size: | |
1219 | * - wait/resume/discard/suspend/backup/allow | |
1220 | * | |
1221 | * suspend/backup/allow always come together | |
1222 | * wait/resume/discard do too. | |
1223 | * For the same-size case we have two backups to improve flow. | |
1224 | * | |
1225 | */ | |
e86c9dd6 | 1226 | |
7236ee7a N |
1227 | int grow_backup(struct mdinfo *sra, |
1228 | unsigned long long offset, /* per device */ | |
1229 | unsigned long stripes, /* per device */ | |
1230 | int *sources, unsigned long long *offsets, | |
1231 | int disks, int chunk, int level, int layout, | |
1232 | int dests, int *destfd, unsigned long long *destoffsets, | |
d4445387 | 1233 | int part, int *degraded, |
7236ee7a N |
1234 | char *buf) |
1235 | { | |
1236 | /* Backup 'blocks' sectors at 'offset' on each device of the array, | |
1237 | * to storage 'destfd' (offset 'destoffsets'), after first | |
1238 | * suspending IO. Then allow resync to continue | |
1239 | * over the suspended section. | |
1240 | * Use part 'part' of the backup-super-block. | |
1241 | */ | |
1242 | int odata = disks; | |
1243 | int rv = 0; | |
1244 | int i; | |
d4445387 | 1245 | unsigned long long new_degraded; |
7236ee7a N |
1246 | //printf("offset %llu\n", offset); |
1247 | if (level >= 4) | |
1248 | odata--; | |
1249 | if (level == 6) | |
1250 | odata--; | |
1251 | sysfs_set_num(sra, NULL, "suspend_hi", (offset + stripes * chunk/512) * odata); | |
d4445387 N |
1252 | /* Check that array hasn't become degraded, else we might backup the wrong data */ |
1253 | sysfs_get_ll(sra, NULL, "degraded", &new_degraded); | |
1254 | if (new_degraded != *degraded) { | |
1255 | /* check each device to ensure it is still working */ | |
1256 | struct mdinfo *sd; | |
1257 | for (sd = sra->devs ; sd ; sd = sd->next) { | |
1258 | if (sd->disk.state & (1<<MD_DISK_FAULTY)) | |
1259 | continue; | |
1260 | if (sd->disk.state & (1<<MD_DISK_SYNC)) { | |
1261 | char sbuf[20]; | |
1262 | if (sysfs_get_str(sra, sd, "state", sbuf, 20) < 0 || | |
1263 | strstr(sbuf, "faulty") || | |
1264 | strstr(sbuf, "in_sync") == NULL) { | |
1265 | /* this device is dead */ | |
1266 | sd->disk.state = (1<<MD_DISK_FAULTY); | |
1267 | if (sd->disk.raid_disk >= 0 && | |
1268 | sources[sd->disk.raid_disk] >= 0) { | |
1269 | close(sources[sd->disk.raid_disk]); | |
1270 | sources[sd->disk.raid_disk] = -1; | |
1271 | } | |
1272 | } | |
1273 | } | |
1274 | } | |
1275 | *degraded = new_degraded; | |
1276 | } | |
7236ee7a N |
1277 | if (part) { |
1278 | bsb.arraystart2 = __cpu_to_le64(offset * odata); | |
1279 | bsb.length2 = __cpu_to_le64(stripes * chunk/512 * odata); | |
1280 | } else { | |
1281 | bsb.arraystart = __cpu_to_le64(offset * odata); | |
1282 | bsb.length = __cpu_to_le64(stripes * chunk/512 * odata); | |
1283 | } | |
1284 | if (part) | |
1285 | bsb.magic[15] = '2'; | |
1286 | for (i = 0; i < dests; i++) | |
1287 | if (part) | |
1288 | lseek64(destfd[i], destoffsets[i] + __le64_to_cpu(bsb.devstart2)*512, 0); | |
1289 | else | |
1290 | lseek64(destfd[i], destoffsets[i], 0); | |
1291 | ||
1292 | rv = save_stripes(sources, offsets, | |
1293 | disks, chunk, level, layout, | |
1294 | dests, destfd, | |
1295 | offset*512*odata, stripes * chunk * odata, | |
1296 | buf); | |
1297 | ||
1298 | if (rv) | |
1299 | return rv; | |
97396422 | 1300 | bsb.mtime = __cpu_to_le64(time(0)); |
7236ee7a N |
1301 | for (i = 0; i < dests; i++) { |
1302 | bsb.devstart = __cpu_to_le64(destoffsets[i]/512); | |
1303 | ||
1304 | bsb.sb_csum = bsb_csum((char*)&bsb, ((char*)&bsb.sb_csum)-((char*)&bsb)); | |
1305 | if (memcmp(bsb.magic, "md_backup_data-2", 16) == 0) | |
1306 | bsb.sb_csum2 = bsb_csum((char*)&bsb, | |
1307 | ((char*)&bsb.sb_csum2)-((char*)&bsb)); | |
1308 | ||
1309 | lseek64(destfd[i], destoffsets[i] - 4096, 0); | |
1310 | write(destfd[i], &bsb, 512); | |
ff94fb86 N |
1311 | if (destoffsets[i] > 4096) { |
1312 | lseek64(destfd[i], destoffsets[i]+stripes*chunk*odata, 0); | |
1313 | write(destfd[i], &bsb, 512); | |
1314 | } | |
7236ee7a N |
1315 | fsync(destfd[i]); |
1316 | } | |
2efedc7b | 1317 | |
7236ee7a N |
1318 | return 0; |
1319 | } | |
1320 | ||
1321 | /* in 2.6.30, the value reported by sync_completed can be | |
1322 | * less that it should be by one stripe. | |
1323 | * This only happens when reshape hits sync_max and pauses. | |
1324 | * So allow wait_backup to either extent sync_max further | |
1325 | * than strictly necessary, or return before the | |
1326 | * sync has got quite as far as we would really like. | |
1327 | * This is what 'blocks2' is for. | |
1328 | * The various caller give appropriate values so that | |
1329 | * every works. | |
1330 | */ | |
1331 | int wait_backup(struct mdinfo *sra, | |
1332 | unsigned long long offset, /* per device */ | |
1333 | unsigned long long blocks, /* per device */ | |
1334 | unsigned long long blocks2, /* per device - hack */ | |
1335 | int dests, int *destfd, unsigned long long *destoffsets, | |
1336 | int part) | |
1337 | { | |
1338 | /* Wait for resync to pass the section that was backed up | |
1339 | * then erase the backup and allow IO | |
1340 | */ | |
1341 | int fd = sysfs_get_fd(sra, NULL, "sync_completed"); | |
1342 | unsigned long long completed; | |
1343 | int i; | |
1344 | ||
1345 | if (fd < 0) | |
1346 | return -1; | |
1347 | sysfs_set_num(sra, NULL, "sync_max", offset + blocks + blocks2); | |
1348 | if (offset == 0) | |
1349 | sysfs_set_str(sra, NULL, "sync_action", "reshape"); | |
1350 | do { | |
1351 | char action[20]; | |
1352 | fd_set rfds; | |
1353 | FD_ZERO(&rfds); | |
1354 | FD_SET(fd, &rfds); | |
1355 | select(fd+1, NULL, NULL, &rfds, NULL); | |
1356 | if (sysfs_fd_get_ll(fd, &completed) < 0) { | |
1357 | close(fd); | |
1358 | return -1; | |
e86c9dd6 | 1359 | } |
7236ee7a N |
1360 | if (sysfs_get_str(sra, NULL, "sync_action", |
1361 | action, 20) > 0 && | |
1362 | strncmp(action, "reshape", 7) != 0) | |
1363 | break; | |
1364 | } while (completed < offset + blocks); | |
1365 | close(fd); | |
1366 | ||
1367 | if (part) { | |
1368 | bsb.arraystart2 = __cpu_to_le64(0); | |
1369 | bsb.length2 = __cpu_to_le64(0); | |
1370 | } else { | |
1371 | bsb.arraystart = __cpu_to_le64(0); | |
1372 | bsb.length = __cpu_to_le64(0); | |
1373 | } | |
97396422 | 1374 | bsb.mtime = __cpu_to_le64(time(0)); |
7236ee7a N |
1375 | for (i = 0; i < dests; i++) { |
1376 | bsb.devstart = __cpu_to_le64(destoffsets[i]/512); | |
1377 | bsb.sb_csum = bsb_csum((char*)&bsb, ((char*)&bsb.sb_csum)-((char*)&bsb)); | |
1378 | if (memcmp(bsb.magic, "md_backup_data-2", 16) == 0) | |
1379 | bsb.sb_csum2 = bsb_csum((char*)&bsb, | |
1380 | ((char*)&bsb.sb_csum2)-((char*)&bsb)); | |
1381 | lseek64(destfd[i], destoffsets[i]-4096, 0); | |
1382 | write(destfd[i], &bsb, 512); | |
1383 | fsync(destfd[i]); | |
1384 | } | |
1385 | return 0; | |
1386 | } | |
e86c9dd6 | 1387 | |
7236ee7a N |
1388 | static void fail(char *msg) |
1389 | { | |
1390 | write(2, msg, strlen(msg)); | |
1391 | write(2, "\n", 1); | |
1392 | exit(1); | |
1393 | } | |
1394 | ||
1395 | static char *abuf, *bbuf; | |
1396 | static int abuflen; | |
1397 | static void validate(int afd, int bfd, unsigned long long offset) | |
1398 | { | |
1399 | /* check that the data in the backup against the array. | |
1400 | * This is only used for regression testing and should not | |
1401 | * be used while the array is active | |
1402 | */ | |
7236ee7a N |
1403 | if (afd < 0) |
1404 | return; | |
1405 | lseek64(bfd, offset - 4096, 0); | |
1406 | if (read(bfd, &bsb2, 512) != 512) | |
1407 | fail("cannot read bsb"); | |
1408 | if (bsb2.sb_csum != bsb_csum((char*)&bsb2, | |
1409 | ((char*)&bsb2.sb_csum)-((char*)&bsb2))) | |
1410 | fail("first csum bad"); | |
1411 | if (memcmp(bsb2.magic, "md_backup_data", 14) != 0) | |
1412 | fail("magic is bad"); | |
1413 | if (memcmp(bsb2.magic, "md_backup_data-2", 16) == 0 && | |
1414 | bsb2.sb_csum2 != bsb_csum((char*)&bsb2, | |
1415 | ((char*)&bsb2.sb_csum2)-((char*)&bsb2))) | |
1416 | fail("second csum bad"); | |
1417 | ||
1418 | if (__le64_to_cpu(bsb2.devstart)*512 != offset) | |
1419 | fail("devstart is wrong"); | |
1420 | ||
1421 | if (bsb2.length) { | |
1422 | unsigned long long len = __le64_to_cpu(bsb2.length)*512; | |
1423 | ||
1424 | if (abuflen < len) { | |
1425 | free(abuf); | |
1426 | free(bbuf); | |
1427 | abuflen = len; | |
1428 | posix_memalign((void**)&abuf, 4096, abuflen); | |
1429 | posix_memalign((void**)&bbuf, 4096, abuflen); | |
e86c9dd6 | 1430 | } |
48924014 | 1431 | |
7236ee7a N |
1432 | lseek64(bfd, offset, 0); |
1433 | if (read(bfd, bbuf, len) != len) { | |
1434 | printf("len %llu\n", len); | |
1435 | fail("read first backup failed"); | |
1436 | } | |
1437 | lseek64(afd, __le64_to_cpu(bsb2.arraystart)*512, 0); | |
1438 | if (read(afd, abuf, len) != len) | |
1439 | fail("read first from array failed"); | |
1440 | if (memcmp(bbuf, abuf, len) != 0) { | |
1441 | int i; | |
1442 | printf("offset=%llu len=%llu\n", | |
1443 | __le64_to_cpu(bsb2.arraystart)*512, len); | |
1444 | for (i=0; i<len; i++) | |
1445 | if (bbuf[i] != abuf[i]) { | |
1446 | printf("first diff byte %d\n", i); | |
93ecfa01 | 1447 | break; |
7236ee7a N |
1448 | } |
1449 | fail("data1 compare failed"); | |
e86c9dd6 | 1450 | } |
7236ee7a N |
1451 | } |
1452 | if (bsb2.length2) { | |
1453 | unsigned long long len = __le64_to_cpu(bsb2.length2)*512; | |
1454 | ||
1455 | if (abuflen < len) { | |
1456 | free(abuf); | |
1457 | free(bbuf); | |
1458 | abuflen = len; | |
1459 | abuf = malloc(abuflen); | |
1460 | bbuf = malloc(abuflen); | |
e86c9dd6 NB |
1461 | } |
1462 | ||
7236ee7a N |
1463 | lseek64(bfd, offset+__le64_to_cpu(bsb2.devstart2)*512, 0); |
1464 | if (read(bfd, bbuf, len) != len) | |
1465 | fail("read second backup failed"); | |
1466 | lseek64(afd, __le64_to_cpu(bsb2.arraystart2)*512, 0); | |
1467 | if (read(afd, abuf, len) != len) | |
1468 | fail("read second from array failed"); | |
1469 | if (memcmp(bbuf, abuf, len) != 0) | |
1470 | fail("data2 compare failed"); | |
e86c9dd6 | 1471 | } |
7236ee7a | 1472 | } |
e86c9dd6 | 1473 | |
7236ee7a N |
1474 | static int child_grow(int afd, struct mdinfo *sra, unsigned long stripes, |
1475 | int *fds, unsigned long long *offsets, | |
1476 | int disks, int chunk, int level, int layout, int data, | |
1477 | int dests, int *destfd, unsigned long long *destoffsets) | |
1478 | { | |
1479 | char *buf; | |
d4445387 | 1480 | int degraded = 0; |
e86c9dd6 | 1481 | |
7236ee7a N |
1482 | posix_memalign((void**)&buf, 4096, disks * chunk); |
1483 | sysfs_set_num(sra, NULL, "suspend_hi", 0); | |
1484 | sysfs_set_num(sra, NULL, "suspend_lo", 0); | |
1485 | grow_backup(sra, 0, stripes, | |
1486 | fds, offsets, disks, chunk, level, layout, | |
1487 | dests, destfd, destoffsets, | |
d4445387 | 1488 | 0, °raded, buf); |
7236ee7a | 1489 | validate(afd, destfd[0], destoffsets[0]); |
725cac4c N |
1490 | wait_backup(sra, 0, stripes * chunk / 512, stripes * chunk / 512, |
1491 | dests, destfd, destoffsets, | |
1492 | 0); | |
7236ee7a N |
1493 | sysfs_set_num(sra, NULL, "suspend_lo", (stripes * chunk/512) * data); |
1494 | free(buf); | |
1495 | /* FIXME this should probably be numeric */ | |
1496 | sysfs_set_str(sra, NULL, "sync_max", "max"); | |
e86c9dd6 | 1497 | return 1; |
7236ee7a | 1498 | } |
e86c9dd6 | 1499 | |
7236ee7a N |
1500 | static int child_shrink(int afd, struct mdinfo *sra, unsigned long stripes, |
1501 | int *fds, unsigned long long *offsets, | |
1502 | int disks, int chunk, int level, int layout, int data, | |
1503 | int dests, int *destfd, unsigned long long *destoffsets) | |
1504 | { | |
1505 | char *buf; | |
1506 | unsigned long long start; | |
1507 | int rv; | |
d4445387 | 1508 | int degraded = 0; |
7236ee7a N |
1509 | |
1510 | posix_memalign((void**)&buf, 4096, disks * chunk); | |
1511 | start = sra->component_size - stripes * chunk/512; | |
1512 | sysfs_set_num(sra, NULL, "sync_max", start); | |
1513 | sysfs_set_str(sra, NULL, "sync_action", "reshape"); | |
1514 | sysfs_set_num(sra, NULL, "suspend_lo", 0); | |
1515 | sysfs_set_num(sra, NULL, "suspend_hi", 0); | |
1516 | rv = wait_backup(sra, 0, start - stripes * chunk/512, stripes * chunk/512, | |
1517 | dests, destfd, destoffsets, 0); | |
1518 | if (rv < 0) | |
1519 | return 0; | |
1520 | grow_backup(sra, 0, stripes, | |
1521 | fds, offsets, | |
1522 | disks, chunk, level, layout, | |
1523 | dests, destfd, destoffsets, | |
d4445387 | 1524 | 0, °raded, buf); |
7236ee7a | 1525 | validate(afd, destfd[0], destoffsets[0]); |
725cac4c N |
1526 | wait_backup(sra, start, stripes*chunk/512, 0, |
1527 | dests, destfd, destoffsets, 0); | |
7236ee7a N |
1528 | sysfs_set_num(sra, NULL, "suspend_lo", (stripes * chunk/512) * data); |
1529 | free(buf); | |
1530 | /* FIXME this should probably be numeric */ | |
1531 | sysfs_set_str(sra, NULL, "sync_max", "max"); | |
1532 | return 1; | |
1533 | } | |
1534 | ||
1535 | static int child_same_size(int afd, struct mdinfo *sra, unsigned long stripes, | |
1536 | int *fds, unsigned long long *offsets, | |
e9e43ec3 | 1537 | unsigned long long start, |
7236ee7a N |
1538 | int disks, int chunk, int level, int layout, int data, |
1539 | int dests, int *destfd, unsigned long long *destoffsets) | |
1540 | { | |
e9e43ec3 | 1541 | unsigned long long size; |
7236ee7a N |
1542 | unsigned long tailstripes = stripes; |
1543 | int part; | |
1544 | char *buf; | |
1545 | unsigned long long speed; | |
d4445387 | 1546 | int degraded = 0; |
7236ee7a N |
1547 | |
1548 | ||
1549 | posix_memalign((void**)&buf, 4096, disks * chunk); | |
1550 | ||
1551 | sysfs_set_num(sra, NULL, "suspend_lo", 0); | |
1552 | sysfs_set_num(sra, NULL, "suspend_hi", 0); | |
1553 | ||
1554 | sysfs_get_ll(sra, NULL, "sync_speed_min", &speed); | |
1555 | sysfs_set_num(sra, NULL, "sync_speed_min", 200000); | |
1556 | ||
e9e43ec3 | 1557 | grow_backup(sra, start, stripes, |
7236ee7a N |
1558 | fds, offsets, |
1559 | disks, chunk, level, layout, | |
1560 | dests, destfd, destoffsets, | |
d4445387 | 1561 | 0, °raded, buf); |
e9e43ec3 | 1562 | grow_backup(sra, (start + stripes) * chunk/512, stripes, |
7236ee7a N |
1563 | fds, offsets, |
1564 | disks, chunk, level, layout, | |
1565 | dests, destfd, destoffsets, | |
d4445387 | 1566 | 1, °raded, buf); |
7236ee7a N |
1567 | validate(afd, destfd[0], destoffsets[0]); |
1568 | part = 0; | |
e9e43ec3 | 1569 | start += stripes * 2; /* where to read next */ |
7236ee7a N |
1570 | size = sra->component_size / (chunk/512); |
1571 | while (start < size) { | |
1572 | if (wait_backup(sra, (start-stripes*2)*chunk/512, | |
1573 | stripes*chunk/512, 0, | |
1574 | dests, destfd, destoffsets, | |
1575 | part) < 0) | |
1576 | return 0; | |
1577 | sysfs_set_num(sra, NULL, "suspend_lo", start*chunk/512 * data); | |
1578 | if (start + stripes > size) | |
1579 | tailstripes = (size - start); | |
1580 | ||
1581 | grow_backup(sra, start*chunk/512, tailstripes, | |
1582 | fds, offsets, | |
1583 | disks, chunk, level, layout, | |
1584 | dests, destfd, destoffsets, | |
d4445387 | 1585 | part, °raded, buf); |
7236ee7a N |
1586 | start += stripes; |
1587 | part = 1 - part; | |
1588 | validate(afd, destfd[0], destoffsets[0]); | |
1589 | } | |
1590 | if (wait_backup(sra, (start-stripes*2) * chunk/512, stripes * chunk/512, 0, | |
1591 | dests, destfd, destoffsets, | |
1592 | part) < 0) | |
1593 | return 0; | |
1594 | sysfs_set_num(sra, NULL, "suspend_lo", ((start-stripes)*chunk/512) * data); | |
725cac4c N |
1595 | wait_backup(sra, (start-stripes) * chunk/512, tailstripes * chunk/512, 0, |
1596 | dests, destfd, destoffsets, | |
1597 | 1-part); | |
7236ee7a N |
1598 | sysfs_set_num(sra, NULL, "suspend_lo", (size*chunk/512) * data); |
1599 | sysfs_set_num(sra, NULL, "sync_speed_min", speed); | |
1600 | free(buf); | |
1601 | return 1; | |
e86c9dd6 | 1602 | } |
353632d9 NB |
1603 | |
1604 | /* | |
1605 | * If any spare contains md_back_data-1 which is recent wrt mtime, | |
1606 | * write that data into the array and update the super blocks with | |
1607 | * the new reshape_progress | |
1608 | */ | |
ea0ebe96 N |
1609 | int Grow_restart(struct supertype *st, struct mdinfo *info, int *fdlist, int cnt, |
1610 | char *backup_file, int verbose) | |
353632d9 NB |
1611 | { |
1612 | int i, j; | |
1613 | int old_disks; | |
353632d9 | 1614 | unsigned long long *offsets; |
82f2d6ab | 1615 | unsigned long long nstripe, ostripe; |
6e9eac4f | 1616 | int ndata, odata; |
353632d9 | 1617 | |
e9e43ec3 N |
1618 | if (info->new_level != info->array.level) |
1619 | return 1; /* Cannot handle level changes (they are instantaneous) */ | |
1620 | ||
1621 | odata = info->array.raid_disks - info->delta_disks - 1; | |
1622 | if (info->array.level == 6) odata--; /* number of data disks */ | |
1623 | ndata = info->array.raid_disks - 1; | |
1624 | if (info->new_level == 6) ndata--; | |
353632d9 NB |
1625 | |
1626 | old_disks = info->array.raid_disks - info->delta_disks; | |
1627 | ||
e9e43ec3 N |
1628 | if (info->delta_disks <= 0) |
1629 | /* Didn't grow, so the backup file must have | |
1630 | * been used | |
1631 | */ | |
1632 | old_disks = cnt; | |
06b0d786 | 1633 | for (i=old_disks-(backup_file?1:0); i<cnt; i++) { |
353632d9 | 1634 | struct mdinfo dinfo; |
06b0d786 | 1635 | int fd; |
e9e43ec3 | 1636 | int bsbsize; |
ea0ebe96 | 1637 | char *devname, namebuf[20]; |
353632d9 NB |
1638 | |
1639 | /* This was a spare and may have some saved data on it. | |
1640 | * Load the superblock, find and load the | |
1641 | * backup_super_block. | |
1642 | * If either fail, go on to next device. | |
1643 | * If the backup contains no new info, just return | |
206c5eae | 1644 | * else restore data and update all superblocks |
353632d9 | 1645 | */ |
06b0d786 NB |
1646 | if (i == old_disks-1) { |
1647 | fd = open(backup_file, O_RDONLY); | |
e9e43ec3 N |
1648 | if (fd<0) { |
1649 | fprintf(stderr, Name ": backup file %s inaccessible: %s\n", | |
1650 | backup_file, strerror(errno)); | |
06b0d786 | 1651 | continue; |
e9e43ec3 | 1652 | } |
ea0ebe96 | 1653 | devname = backup_file; |
06b0d786 NB |
1654 | } else { |
1655 | fd = fdlist[i]; | |
1656 | if (fd < 0) | |
1657 | continue; | |
3da92f27 | 1658 | if (st->ss->load_super(st, fd, NULL)) |
06b0d786 | 1659 | continue; |
353632d9 | 1660 | |
3da92f27 NB |
1661 | st->ss->getinfo_super(st, &dinfo); |
1662 | st->ss->free_super(st); | |
1663 | ||
06b0d786 NB |
1664 | if (lseek64(fd, |
1665 | (dinfo.data_offset + dinfo.component_size - 8) <<9, | |
ea0ebe96 N |
1666 | 0) < 0) { |
1667 | fprintf(stderr, Name ": Cannot seek on device %d\n", i); | |
06b0d786 | 1668 | continue; /* Cannot seek */ |
ea0ebe96 N |
1669 | } |
1670 | sprintf(namebuf, "device-%d", i); | |
1671 | devname = namebuf; | |
06b0d786 | 1672 | } |
ea0ebe96 N |
1673 | if (read(fd, &bsb, sizeof(bsb)) != sizeof(bsb)) { |
1674 | if (verbose) | |
1675 | fprintf(stderr, Name ": Cannot read from %s\n", devname); | |
353632d9 | 1676 | continue; /* Cannot read */ |
ea0ebe96 | 1677 | } |
e9e43ec3 | 1678 | if (memcmp(bsb.magic, "md_backup_data-1", 16) != 0 && |
ea0ebe96 N |
1679 | memcmp(bsb.magic, "md_backup_data-2", 16) != 0) { |
1680 | if (verbose) | |
1681 | fprintf(stderr, Name ": No backup metadata on %s\n", devname); | |
353632d9 | 1682 | continue; |
ea0ebe96 N |
1683 | } |
1684 | if (bsb.sb_csum != bsb_csum((char*)&bsb, ((char*)&bsb.sb_csum)-((char*)&bsb))) { | |
1685 | if (verbose) | |
1686 | fprintf(stderr, Name ": Bad backup-metadata checksum on %s\n", devname); | |
353632d9 | 1687 | continue; /* bad checksum */ |
ea0ebe96 | 1688 | } |
e9e43ec3 | 1689 | if (memcmp(bsb.magic, "md_backup_data-2", 16) == 0 && |
ea0ebe96 N |
1690 | bsb.sb_csum2 != bsb_csum((char*)&bsb, ((char*)&bsb.sb_csum2)-((char*)&bsb))) { |
1691 | if (verbose) | |
1692 | fprintf(stderr, Name ": Bad backup-metadata checksum2 on %s\n", devname); | |
22e30516 | 1693 | continue; /* Bad second checksum */ |
ea0ebe96 N |
1694 | } |
1695 | if (memcmp(bsb.set_uuid,info->uuid, 16) != 0) { | |
1696 | if (verbose) | |
1697 | fprintf(stderr, Name ": Wrong uuid on backup-metadata on %s\n", devname); | |
353632d9 | 1698 | continue; /* Wrong uuid */ |
ea0ebe96 | 1699 | } |
353632d9 | 1700 | |
97396422 N |
1701 | if (info->array.utime > __le64_to_cpu(bsb.mtime) + 10*60 || |
1702 | info->array.utime < __le64_to_cpu(bsb.mtime) - 10*60) { | |
ea0ebe96 N |
1703 | if (verbose) |
1704 | fprintf(stderr, Name ": too-old timestamp on backup-metadata on %s\n", devname); | |
353632d9 | 1705 | continue; /* time stamp is too bad */ |
ea0ebe96 | 1706 | } |
353632d9 | 1707 | |
e9e43ec3 N |
1708 | if (bsb.magic[15] == '1') { |
1709 | if (info->delta_disks >= 0) { | |
1710 | /* reshape_progress is increasing */ | |
1711 | if (__le64_to_cpu(bsb.arraystart) + __le64_to_cpu(bsb.length) < | |
ea0ebe96 N |
1712 | info->reshape_progress) { |
1713 | nonew: | |
1714 | if (verbose) | |
1715 | fprintf(stderr, Name ": backup-metadata found on %s but is not needed\n", devname); | |
e9e43ec3 | 1716 | continue; /* No new data here */ |
ea0ebe96 | 1717 | } |
e9e43ec3 N |
1718 | } else { |
1719 | /* reshape_progress is decreasing */ | |
1720 | if (__le64_to_cpu(bsb.arraystart) >= | |
1721 | info->reshape_progress) | |
ea0ebe96 | 1722 | goto nonew; /* No new data here */ |
e9e43ec3 N |
1723 | } |
1724 | } else { | |
1725 | if (info->delta_disks >= 0) { | |
1726 | /* reshape_progress is increasing */ | |
1727 | if (__le64_to_cpu(bsb.arraystart) + __le64_to_cpu(bsb.length) < | |
1728 | info->reshape_progress && | |
1729 | __le64_to_cpu(bsb.arraystart2) + __le64_to_cpu(bsb.length2) < | |
1730 | info->reshape_progress) | |
ea0ebe96 | 1731 | goto nonew; /* No new data here */ |
e9e43ec3 N |
1732 | } else { |
1733 | /* reshape_progress is decreasing */ | |
1734 | if (__le64_to_cpu(bsb.arraystart) >= | |
1735 | info->reshape_progress && | |
1736 | __le64_to_cpu(bsb.arraystart2) >= | |
1737 | info->reshape_progress) | |
ea0ebe96 | 1738 | goto nonew; /* No new data here */ |
e9e43ec3 N |
1739 | } |
1740 | } | |
ea0ebe96 N |
1741 | if (lseek64(fd, __le64_to_cpu(bsb.devstart)*512, 0)< 0) { |
1742 | second_fail: | |
1743 | if (verbose) | |
1744 | fprintf(stderr, Name ": Failed to verify secondary backup-metadata block on %s\n", | |
1745 | devname); | |
353632d9 | 1746 | continue; /* Cannot seek */ |
ea0ebe96 | 1747 | } |
2efedc7b | 1748 | /* There should be a duplicate backup superblock 4k before here */ |
06b0d786 | 1749 | if (lseek64(fd, -4096, 1) < 0 || |
ff94fb86 | 1750 | read(fd, &bsb2, 4096) != 4096) |
ea0ebe96 | 1751 | goto second_fail; /* Cannot find leading superblock */ |
e9e43ec3 N |
1752 | if (bsb.magic[15] == '1') |
1753 | bsbsize = offsetof(struct mdp_backup_super, pad1); | |
1754 | else | |
1755 | bsbsize = offsetof(struct mdp_backup_super, pad); | |
ff94fb86 | 1756 | if (memcmp(&bsb2, &bsb, bsbsize) != 0) |
ea0ebe96 | 1757 | goto second_fail; /* Cannot find leading superblock */ |
2efedc7b | 1758 | |
353632d9 NB |
1759 | /* Now need the data offsets for all devices. */ |
1760 | offsets = malloc(sizeof(*offsets)*info->array.raid_disks); | |
1761 | for(j=0; j<info->array.raid_disks; j++) { | |
1762 | if (fdlist[j] < 0) | |
1763 | continue; | |
3da92f27 | 1764 | if (st->ss->load_super(st, fdlist[j], NULL)) |
353632d9 NB |
1765 | /* FIXME should be this be an error */ |
1766 | continue; | |
3da92f27 NB |
1767 | st->ss->getinfo_super(st, &dinfo); |
1768 | st->ss->free_super(st); | |
14e5b4d7 | 1769 | offsets[j] = dinfo.data_offset * 512; |
353632d9 NB |
1770 | } |
1771 | printf(Name ": restoring critical section\n"); | |
1772 | ||
1773 | if (restore_stripes(fdlist, offsets, | |
1774 | info->array.raid_disks, | |
1775 | info->new_chunk, | |
1776 | info->new_level, | |
1777 | info->new_layout, | |
06b0d786 | 1778 | fd, __le64_to_cpu(bsb.devstart)*512, |
92dcdf7c | 1779 | __le64_to_cpu(bsb.arraystart)*512, |
e9e43ec3 N |
1780 | __le64_to_cpu(bsb.length)*512)) { |
1781 | /* didn't succeed, so giveup */ | |
ea0ebe96 N |
1782 | if (verbose) |
1783 | fprintf(stderr, Name ": Error restoring backup from %s\n", | |
1784 | devname); | |
e9e43ec3 N |
1785 | return 1; |
1786 | } | |
1787 | ||
1788 | if (bsb.magic[15] == '2' && | |
1789 | restore_stripes(fdlist, offsets, | |
1790 | info->array.raid_disks, | |
1791 | info->new_chunk, | |
1792 | info->new_level, | |
1793 | info->new_layout, | |
1794 | fd, __le64_to_cpu(bsb.devstart)*512 + | |
1795 | __le64_to_cpu(bsb.devstart2)*512, | |
92dcdf7c | 1796 | __le64_to_cpu(bsb.arraystart2)*512, |
e9e43ec3 | 1797 | __le64_to_cpu(bsb.length2)*512)) { |
353632d9 | 1798 | /* didn't succeed, so giveup */ |
ea0ebe96 N |
1799 | if (verbose) |
1800 | fprintf(stderr, Name ": Error restoring second backup from %s\n", | |
1801 | devname); | |
2295250a | 1802 | return 1; |
353632d9 NB |
1803 | } |
1804 | ||
e9e43ec3 | 1805 | |
353632d9 NB |
1806 | /* Ok, so the data is restored. Let's update those superblocks. */ |
1807 | ||
e9e43ec3 N |
1808 | if (info->delta_disks >= 0) { |
1809 | info->reshape_progress = __le64_to_cpu(bsb.arraystart) + | |
1810 | __le64_to_cpu(bsb.length); | |
1811 | if (bsb.magic[15] == '2') { | |
1812 | unsigned long long p2 = __le64_to_cpu(bsb.arraystart2) + | |
1813 | __le64_to_cpu(bsb.length2); | |
1814 | if (p2 > info->reshape_progress) | |
1815 | info->reshape_progress = p2; | |
1816 | } | |
1817 | } else { | |
1818 | info->reshape_progress = __le64_to_cpu(bsb.arraystart); | |
1819 | if (bsb.magic[15] == '2') { | |
1820 | unsigned long long p2 = __le64_to_cpu(bsb.arraystart2); | |
1821 | if (p2 < info->reshape_progress) | |
1822 | info->reshape_progress = p2; | |
1823 | } | |
1824 | } | |
353632d9 NB |
1825 | for (j=0; j<info->array.raid_disks; j++) { |
1826 | if (fdlist[j] < 0) continue; | |
3da92f27 | 1827 | if (st->ss->load_super(st, fdlist[j], NULL)) |
353632d9 | 1828 | continue; |
3da92f27 | 1829 | st->ss->getinfo_super(st, &dinfo); |
e9e43ec3 | 1830 | dinfo.reshape_progress = info->reshape_progress; |
3da92f27 | 1831 | st->ss->update_super(st, &dinfo, |
68c7d6d7 NB |
1832 | "_reshape_progress", |
1833 | NULL,0, 0, NULL); | |
3da92f27 NB |
1834 | st->ss->store_super(st, fdlist[j]); |
1835 | st->ss->free_super(st); | |
353632d9 | 1836 | } |
353632d9 NB |
1837 | return 0; |
1838 | } | |
6e9eac4f NB |
1839 | /* Didn't find any backup data, try to see if any |
1840 | * was needed. | |
1841 | */ | |
82f2d6ab N |
1842 | if (info->delta_disks < 0) { |
1843 | /* When shrinking, the critical section is at the end. | |
1844 | * So see if we are before the critical section. | |
1845 | */ | |
1846 | unsigned long long first_block; | |
1847 | nstripe = ostripe = 0; | |
1848 | first_block = 0; | |
1849 | while (ostripe >= nstripe) { | |
1850 | ostripe += info->array.chunk_size / 512; | |
1851 | first_block = ostripe * odata; | |
1852 | nstripe = first_block / ndata / (info->new_chunk/512) * | |
1853 | (info->new_chunk/512); | |
1854 | } | |
1855 | ||
1856 | if (info->reshape_progress >= first_block) | |
1857 | return 0; | |
6e9eac4f | 1858 | } |
82f2d6ab N |
1859 | if (info->delta_disks > 0) { |
1860 | /* See if we are beyond the critical section. */ | |
1861 | unsigned long long last_block; | |
1862 | nstripe = ostripe = 0; | |
1863 | last_block = 0; | |
1864 | while (nstripe >= ostripe) { | |
1865 | nstripe += info->new_chunk / 512; | |
1866 | last_block = nstripe * ndata; | |
1867 | ostripe = last_block / odata / (info->array.chunk_size/512) * | |
1868 | (info->array.chunk_size/512); | |
1869 | } | |
6e9eac4f | 1870 | |
82f2d6ab N |
1871 | if (info->reshape_progress >= last_block) |
1872 | return 0; | |
1873 | } | |
6e9eac4f | 1874 | /* needed to recover critical section! */ |
ea0ebe96 N |
1875 | if (verbose) |
1876 | fprintf(stderr, Name ": Failed to find backup of critical section\n"); | |
2295250a | 1877 | return 1; |
353632d9 | 1878 | } |
e9e43ec3 N |
1879 | |
1880 | int Grow_continue(int mdfd, struct supertype *st, struct mdinfo *info, | |
1881 | char *backup_file) | |
1882 | { | |
1883 | /* Array is assembled and ready to be started, but | |
1884 | * monitoring is probably required. | |
1885 | * So: | |
1886 | * - start read-only | |
1887 | * - set upper bound for resync | |
1888 | * - initialise the 'suspend' boundaries | |
1889 | * - switch to read-write | |
1890 | * - fork and continue monitoring | |
1891 | */ | |
1892 | int err; | |
1893 | int backup_list[1]; | |
1894 | unsigned long long backup_offsets[1]; | |
1895 | int odisks, ndisks, ochunk, nchunk,odata,ndata; | |
1896 | unsigned long a,b,blocks,stripes; | |
1897 | int backup_fd; | |
1898 | int *fds; | |
1899 | unsigned long long *offsets; | |
1900 | int d; | |
1901 | struct mdinfo *sra, *sd; | |
1902 | int rv; | |
1b13faf7 | 1903 | int cache; |
e9e43ec3 N |
1904 | int done = 0; |
1905 | ||
1906 | err = sysfs_set_str(info, NULL, "array_state", "readonly"); | |
1907 | if (err) | |
1908 | return err; | |
1909 | ||
1910 | /* make sure reshape doesn't progress until we are ready */ | |
1911 | sysfs_set_str(info, NULL, "sync_max", "0"); | |
1912 | sysfs_set_str(info, NULL, "array_state", "active"); /* FIXME or clean */ | |
1913 | ||
1914 | /* ndisks is not growing, so raid_disks is old and +delta is new */ | |
1915 | odisks = info->array.raid_disks; | |
1916 | ndisks = odisks + info->delta_disks; | |
1917 | odata = odisks - 1; | |
1918 | ndata = ndisks - 1; | |
1919 | if (info->array.level == 6) { | |
1920 | odata--; | |
1921 | ndata--; | |
1922 | } | |
1923 | ochunk = info->array.chunk_size; | |
1924 | nchunk = info->new_chunk; | |
1925 | ||
1926 | ||
1927 | a = ochunk/512 * odata; | |
1928 | b = nchunk/512 * ndata; | |
1929 | /* Find GCD */ | |
1930 | while (a != b) { | |
1931 | if (a < b) | |
1932 | b -= a; | |
1933 | if (b < a) | |
1934 | a -= b; | |
1935 | } | |
1936 | /* LCM == product / GCD */ | |
1937 | blocks = ochunk/512 * nchunk/512 * odata * ndata / a; | |
1938 | ||
1b13faf7 N |
1939 | sra = sysfs_read(-1, devname2devnum(info->sys_name), |
1940 | GET_COMPONENT|GET_DEVS|GET_OFFSET|GET_STATE| | |
1941 | GET_CACHE); | |
1942 | ||
1943 | ||
e9e43ec3 | 1944 | if (ndata == odata) |
1b13faf7 N |
1945 | while (blocks * 32 < sra->component_size && |
1946 | blocks < 16*1024*2) | |
1947 | blocks *= 2; | |
e9e43ec3 N |
1948 | stripes = blocks / (info->array.chunk_size/512) / odata; |
1949 | ||
1b13faf7 N |
1950 | /* check that the internal stripe cache is |
1951 | * large enough, or it won't work. | |
1952 | */ | |
1953 | cache = (nchunk < ochunk) ? ochunk : nchunk; | |
1954 | cache = cache * 4 / 4096; | |
1955 | if (cache < blocks / 8 / odisks + 16) | |
1956 | /* Make it big enough to hold 'blocks' */ | |
1957 | cache = blocks / 8 / odisks + 16; | |
1958 | if (sra->cache_size < cache) | |
1959 | sysfs_set_num(sra, NULL, "stripe_cache_size", | |
1960 | cache+1); | |
e9e43ec3 N |
1961 | |
1962 | memset(&bsb, 0, 512); | |
1963 | memcpy(bsb.magic, "md_backup_data-1", 16); | |
1964 | memcpy(&bsb.set_uuid, info->uuid, 16); | |
1965 | bsb.mtime = __cpu_to_le64(time(0)); | |
1966 | bsb.devstart2 = blocks; | |
1967 | ||
1968 | backup_fd = open(backup_file, O_RDWR|O_CREAT, S_IRUSR | S_IWUSR); | |
1969 | backup_list[0] = backup_fd; | |
1970 | backup_offsets[0] = 8 * 512; | |
1971 | fds = malloc(odisks * sizeof(fds[0])); | |
1972 | offsets = malloc(odisks * sizeof(offsets[0])); | |
1973 | for (d=0; d<odisks; d++) | |
1974 | fds[d] = -1; | |
1975 | ||
e9e43ec3 N |
1976 | for (sd = sra->devs; sd; sd = sd->next) { |
1977 | if (sd->disk.state & (1<<MD_DISK_FAULTY)) | |
1978 | continue; | |
1979 | if (sd->disk.state & (1<<MD_DISK_SYNC)) { | |
1980 | char *dn = map_dev(sd->disk.major, | |
1981 | sd->disk.minor, 1); | |
1982 | fds[sd->disk.raid_disk] | |
1983 | = dev_open(dn, O_RDONLY); | |
1984 | offsets[sd->disk.raid_disk] = sd->data_offset*512; | |
1985 | if (fds[sd->disk.raid_disk] < 0) { | |
1986 | fprintf(stderr, Name ": %s: cannot open component %s\n", | |
1987 | info->sys_name, dn?dn:"-unknown-"); | |
1988 | rv = 1; | |
1989 | goto release; | |
1990 | } | |
1991 | free(dn); | |
1992 | } | |
1993 | } | |
1994 | ||
1995 | switch(fork()) { | |
1996 | case 0: | |
1997 | close(mdfd); | |
1998 | mlockall(MCL_FUTURE); | |
1999 | if (info->delta_disks < 0) | |
2000 | done = child_shrink(-1, info, stripes, | |
2001 | fds, offsets, | |
2002 | info->array.raid_disks, | |
2003 | info->array.chunk_size, | |
2004 | info->array.level, info->array.layout, | |
2005 | odata, | |
2006 | 1, backup_list, backup_offsets); | |
2007 | else if (info->delta_disks == 0) { | |
2008 | /* The 'start' is a per-device stripe number. | |
2009 | * reshape_progress is a per-array sector number. | |
2010 | * So divide by ndata * chunk_size | |
2011 | */ | |
2012 | unsigned long long start = info->reshape_progress / ndata; | |
2013 | start /= (info->array.chunk_size/512); | |
2014 | done = child_same_size(-1, info, stripes, | |
2015 | fds, offsets, | |
2016 | start, | |
2017 | info->array.raid_disks, | |
2018 | info->array.chunk_size, | |
2019 | info->array.level, info->array.layout, | |
2020 | odata, | |
2021 | 1, backup_list, backup_offsets); | |
2022 | } | |
2023 | if (backup_file && done) | |
2024 | unlink(backup_file); | |
2025 | /* FIXME should I intuit a level change */ | |
2026 | exit(0); | |
2027 | case -1: | |
2028 | fprintf(stderr, Name ": Cannot run child to continue monitoring reshape: %s\n", | |
2029 | strerror(errno)); | |
2030 | return 1; | |
2031 | default: | |
2032 | break; | |
2033 | } | |
2034 | release: | |
2035 | return 0; | |
2036 | } | |
2037 | ||
2038 |