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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; |
4725bc31 | 54 | char *subarray = NULL; |
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 | ||
4725bc31 N |
61 | if (info.array.level != -1) { |
62 | fprintf(stderr, Name ": can only add devices to linear arrays\n"); | |
63 | return 1; | |
64 | } | |
65 | ||
66 | st = super_by_fd(fd, &subarray); | |
82d9eba6 | 67 | if (!st) { |
f9ce90ba NB |
68 | fprintf(stderr, Name ": cannot handle arrays with superblock version %d\n", info.array.major_version); |
69 | return 1; | |
70 | } | |
71 | ||
4725bc31 N |
72 | if (subarray) { |
73 | fprintf(stderr, Name ": Cannot grow linear sub-arrays yet\n"); | |
74 | free(subarray); | |
75 | free(st); | |
e5329c37 NB |
76 | } |
77 | ||
6416d527 | 78 | nfd = open(newdev, O_RDWR|O_EXCL|O_DIRECT); |
e5329c37 NB |
79 | if (nfd < 0) { |
80 | fprintf(stderr, Name ": cannot open %s\n", newdev); | |
4725bc31 | 81 | free(st); |
e5329c37 NB |
82 | return 1; |
83 | } | |
84 | fstat(nfd, &stb); | |
85 | if ((stb.st_mode & S_IFMT) != S_IFBLK) { | |
86 | fprintf(stderr, Name ": %s is not a block device!\n", newdev); | |
87 | close(nfd); | |
4725bc31 | 88 | free(st); |
e5329c37 NB |
89 | return 1; |
90 | } | |
91 | /* now check out all the devices and make sure we can read the superblock */ | |
4b1ac34b | 92 | for (d=0 ; d < info.array.raid_disks ; d++) { |
e5329c37 NB |
93 | mdu_disk_info_t disk; |
94 | char *dv; | |
95 | ||
4725bc31 N |
96 | st->ss->free_super(st); |
97 | ||
e5329c37 NB |
98 | disk.number = d; |
99 | if (ioctl(fd, GET_DISK_INFO, &disk) < 0) { | |
100 | fprintf(stderr, Name ": cannot get device detail for device %d\n", | |
101 | d); | |
4725bc31 N |
102 | close(nfd); |
103 | free(st); | |
e5329c37 NB |
104 | return 1; |
105 | } | |
16c6fa80 | 106 | dv = map_dev(disk.major, disk.minor, 1); |
e5329c37 NB |
107 | if (!dv) { |
108 | fprintf(stderr, Name ": cannot find device file for device %d\n", | |
109 | d); | |
4725bc31 N |
110 | close(nfd); |
111 | free(st); | |
e5329c37 NB |
112 | return 1; |
113 | } | |
16c6fa80 | 114 | fd2 = dev_open(dv, O_RDWR); |
e5329c37 NB |
115 | if (!fd2) { |
116 | fprintf(stderr, Name ": cannot open device file %s\n", dv); | |
4725bc31 N |
117 | close(nfd); |
118 | free(st); | |
e5329c37 NB |
119 | return 1; |
120 | } | |
3da92f27 NB |
121 | |
122 | if (st->ss->load_super(st, fd2, NULL)) { | |
e5329c37 | 123 | fprintf(stderr, Name ": cannot find super block on %s\n", dv); |
4725bc31 | 124 | close(nfd); |
e5329c37 | 125 | close(fd2); |
4725bc31 | 126 | free(st); |
e5329c37 NB |
127 | return 1; |
128 | } | |
129 | close(fd2); | |
130 | } | |
131 | /* Ok, looks good. Lets update the superblock and write it out to | |
132 | * newdev. | |
133 | */ | |
aba69144 | 134 | |
4b1ac34b NB |
135 | info.disk.number = d; |
136 | info.disk.major = major(stb.st_rdev); | |
137 | info.disk.minor = minor(stb.st_rdev); | |
138 | info.disk.raid_disk = d; | |
139 | info.disk.state = (1 << MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE); | |
3da92f27 | 140 | st->ss->update_super(st, &info, "linear-grow-new", newdev, |
f752781f | 141 | 0, 0, NULL); |
e5329c37 | 142 | |
3da92f27 | 143 | if (st->ss->store_super(st, nfd)) { |
f752781f NB |
144 | fprintf(stderr, Name ": Cannot store new superblock on %s\n", |
145 | newdev); | |
e5329c37 NB |
146 | close(nfd); |
147 | return 1; | |
148 | } | |
e5329c37 | 149 | close(nfd); |
4b1ac34b NB |
150 | |
151 | if (ioctl(fd, ADD_NEW_DISK, &info.disk) != 0) { | |
e5329c37 NB |
152 | fprintf(stderr, Name ": Cannot add new disk to this array\n"); |
153 | return 1; | |
154 | } | |
155 | /* Well, that seems to have worked. | |
156 | * Now go through and update all superblocks | |
157 | */ | |
158 | ||
4b1ac34b | 159 | if (ioctl(fd, GET_ARRAY_INFO, &info.array) < 0) { |
e5329c37 NB |
160 | fprintf(stderr, Name ": cannot get array info for %s\n", devname); |
161 | return 1; | |
162 | } | |
163 | ||
164 | nd = d; | |
4b1ac34b | 165 | for (d=0 ; d < info.array.raid_disks ; d++) { |
e5329c37 NB |
166 | mdu_disk_info_t disk; |
167 | char *dv; | |
168 | ||
169 | disk.number = d; | |
170 | if (ioctl(fd, GET_DISK_INFO, &disk) < 0) { | |
171 | fprintf(stderr, Name ": cannot get device detail for device %d\n", | |
172 | d); | |
173 | return 1; | |
174 | } | |
16c6fa80 | 175 | dv = map_dev(disk.major, disk.minor, 1); |
e5329c37 NB |
176 | if (!dv) { |
177 | fprintf(stderr, Name ": cannot find device file for device %d\n", | |
178 | d); | |
179 | return 1; | |
180 | } | |
16c6fa80 | 181 | fd2 = dev_open(dv, O_RDWR); |
e5329c37 NB |
182 | if (fd2 < 0) { |
183 | fprintf(stderr, Name ": cannot open device file %s\n", dv); | |
184 | return 1; | |
185 | } | |
3da92f27 | 186 | if (st->ss->load_super(st, fd2, NULL)) { |
e5329c37 NB |
187 | fprintf(stderr, Name ": cannot find super block on %s\n", dv); |
188 | close(fd); | |
189 | return 1; | |
190 | } | |
4b1ac34b NB |
191 | info.array.raid_disks = nd+1; |
192 | info.array.nr_disks = nd+1; | |
193 | info.array.active_disks = nd+1; | |
194 | info.array.working_disks = nd+1; | |
f752781f | 195 | |
3da92f27 | 196 | st->ss->update_super(st, &info, "linear-grow-update", dv, |
f752781f | 197 | 0, 0, NULL); |
aba69144 | 198 | |
3da92f27 | 199 | if (st->ss->store_super(st, fd2)) { |
e5329c37 NB |
200 | fprintf(stderr, Name ": Cannot store new superblock on %s\n", dv); |
201 | close(fd2); | |
202 | return 1; | |
203 | } | |
204 | close(fd2); | |
205 | } | |
206 | ||
207 | return 0; | |
208 | } | |
f5e166fe | 209 | |
8fac0577 | 210 | int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int write_behind, int force) |
f5e166fe NB |
211 | { |
212 | /* | |
213 | * First check that array doesn't have a bitmap | |
214 | * Then create the bitmap | |
215 | * Then add it | |
216 | * | |
217 | * For internal bitmaps, we need to check the version, | |
218 | * find all the active devices, and write the bitmap block | |
219 | * to all devices | |
220 | */ | |
221 | mdu_bitmap_file_t bmf; | |
222 | mdu_array_info_t array; | |
223 | struct supertype *st; | |
4725bc31 | 224 | char *subarray = NULL; |
dcec9ee5 NB |
225 | int major = BITMAP_MAJOR_HI; |
226 | int vers = md_get_version(fd); | |
8fac0577 | 227 | unsigned long long bitmapsize, array_size; |
dcec9ee5 NB |
228 | |
229 | if (vers < 9003) { | |
230 | major = BITMAP_MAJOR_HOSTENDIAN; | |
231 | #ifdef __BIG_ENDIAN | |
232 | fprintf(stderr, Name ": Warning - bitmaps created on this kernel are not portable\n" | |
233 | " between different architectured. Consider upgrading the Linux kernel.\n"); | |
234 | #endif | |
235 | } | |
f5e166fe NB |
236 | |
237 | if (ioctl(fd, GET_BITMAP_FILE, &bmf) != 0) { | |
353632d9 | 238 | if (errno == ENOMEM) |
f5e166fe NB |
239 | fprintf(stderr, Name ": Memory allocation failure.\n"); |
240 | else | |
241 | fprintf(stderr, Name ": bitmaps not supported by this kernel.\n"); | |
242 | return 1; | |
243 | } | |
244 | if (bmf.pathname[0]) { | |
fe80f49b NB |
245 | if (strcmp(file,"none")==0) { |
246 | if (ioctl(fd, SET_BITMAP_FILE, -1)!= 0) { | |
247 | fprintf(stderr, Name ": failed to remove bitmap %s\n", | |
248 | bmf.pathname); | |
249 | return 1; | |
250 | } | |
251 | return 0; | |
252 | } | |
f5e166fe NB |
253 | fprintf(stderr, Name ": %s already has a bitmap (%s)\n", |
254 | devname, bmf.pathname); | |
255 | return 1; | |
256 | } | |
257 | if (ioctl(fd, GET_ARRAY_INFO, &array) != 0) { | |
258 | fprintf(stderr, Name ": cannot get array status for %s\n", devname); | |
259 | return 1; | |
260 | } | |
261 | if (array.state & (1<<MD_SB_BITMAP_PRESENT)) { | |
fe80f49b NB |
262 | if (strcmp(file, "none")==0) { |
263 | array.state &= ~(1<<MD_SB_BITMAP_PRESENT); | |
264 | if (ioctl(fd, SET_ARRAY_INFO, &array)!= 0) { | |
265 | fprintf(stderr, Name ": failed to remove internal bitmap.\n"); | |
266 | return 1; | |
267 | } | |
268 | return 0; | |
269 | } | |
f5e166fe NB |
270 | fprintf(stderr, Name ": Internal bitmap already present on %s\n", |
271 | devname); | |
272 | return 1; | |
273 | } | |
4725bc31 N |
274 | |
275 | if (strcmp(file, "none") == 0) { | |
276 | fprintf(stderr, Name ": no bitmap found on %s\n", devname); | |
277 | return 1; | |
278 | } | |
5b28bd56 NB |
279 | if (array.level <= 0) { |
280 | fprintf(stderr, Name ": Bitmaps not meaningful with level %s\n", | |
281 | map_num(pers, array.level)?:"of this array"); | |
282 | return 1; | |
283 | } | |
8fac0577 NB |
284 | bitmapsize = array.size; |
285 | bitmapsize <<= 1; | |
beae1dfe | 286 | if (get_dev_size(fd, NULL, &array_size) && |
8fac0577 NB |
287 | array_size > (0x7fffffffULL<<9)) { |
288 | /* Array is big enough that we cannot trust array.size | |
289 | * try other approaches | |
290 | */ | |
291 | bitmapsize = get_component_size(fd); | |
292 | } | |
8fac0577 NB |
293 | if (bitmapsize == 0) { |
294 | fprintf(stderr, Name ": Cannot reliably determine size of array to create bitmap - sorry.\n"); | |
295 | return 1; | |
296 | } | |
297 | ||
f9c25f1d | 298 | if (array.level == 10) { |
8686f3ed | 299 | int ncopies = (array.layout&255)*((array.layout>>8)&255); |
f9c25f1d NB |
300 | bitmapsize = bitmapsize * array.raid_disks / ncopies; |
301 | } | |
302 | ||
4725bc31 | 303 | st = super_by_fd(fd, &subarray); |
f5e166fe NB |
304 | if (!st) { |
305 | fprintf(stderr, Name ": Cannot understand version %d.%d\n", | |
306 | array.major_version, array.minor_version); | |
307 | return 1; | |
308 | } | |
4725bc31 N |
309 | if (subarray) { |
310 | fprintf(stderr, Name ": Cannot add bitmaps to sub-arrays yet\n"); | |
311 | free(subarray); | |
312 | free(st); | |
fe80f49b | 313 | return 1; |
4725bc31 N |
314 | } |
315 | if (strcmp(file, "internal") == 0) { | |
f5e166fe | 316 | int d; |
ebeb3663 N |
317 | if (st->ss->add_internal_bitmap == NULL) { |
318 | fprintf(stderr, Name ": Internal bitmaps not supported " | |
319 | "with %s metadata\n", st->ss->name); | |
320 | return 1; | |
321 | } | |
ea329559 | 322 | for (d=0; d< st->max_devs; d++) { |
f5e166fe NB |
323 | mdu_disk_info_t disk; |
324 | char *dv; | |
325 | disk.number = d; | |
326 | if (ioctl(fd, GET_DISK_INFO, &disk) < 0) | |
327 | continue; | |
328 | if (disk.major == 0 && | |
329 | disk.minor == 0) | |
330 | continue; | |
331 | if ((disk.state & (1<<MD_DISK_SYNC))==0) | |
332 | continue; | |
16c6fa80 | 333 | dv = map_dev(disk.major, disk.minor, 1); |
f5e166fe | 334 | if (dv) { |
16c6fa80 | 335 | int fd2 = dev_open(dv, O_RDWR); |
f5e166fe NB |
336 | if (fd2 < 0) |
337 | continue; | |
3da92f27 | 338 | if (st->ss->load_super(st, fd2, NULL)==0) { |
199171a2 | 339 | if (st->ss->add_internal_bitmap( |
3da92f27 | 340 | st, |
199171a2 NB |
341 | &chunk, delay, write_behind, |
342 | bitmapsize, 0, major) | |
343 | ) | |
3da92f27 | 344 | st->ss->write_bitmap(st, fd2); |
21e92547 NB |
345 | else { |
346 | fprintf(stderr, Name ": failed to create internal bitmap - chunksize problem.\n"); | |
347 | close(fd2); | |
348 | return 1; | |
349 | } | |
f5e166fe NB |
350 | } |
351 | close(fd2); | |
352 | } | |
353 | } | |
354 | array.state |= (1<<MD_SB_BITMAP_PRESENT); | |
355 | if (ioctl(fd, SET_ARRAY_INFO, &array)!= 0) { | |
356 | fprintf(stderr, Name ": failed to set internal bitmap.\n"); | |
357 | return 1; | |
358 | } | |
fe80f49b NB |
359 | } else { |
360 | int uuid[4]; | |
361 | int bitmap_fd; | |
362 | int d; | |
363 | int max_devs = st->max_devs; | |
fe80f49b NB |
364 | |
365 | /* try to load a superblock */ | |
366 | for (d=0; d<max_devs; d++) { | |
367 | mdu_disk_info_t disk; | |
368 | char *dv; | |
369 | int fd2; | |
370 | disk.number = d; | |
371 | if (ioctl(fd, GET_DISK_INFO, &disk) < 0) | |
372 | continue; | |
373 | if ((disk.major==0 && disk.minor==0) || | |
374 | (disk.state & (1<<MD_DISK_REMOVED))) | |
375 | continue; | |
16c6fa80 | 376 | dv = map_dev(disk.major, disk.minor, 1); |
fe80f49b | 377 | if (!dv) continue; |
16c6fa80 | 378 | fd2 = dev_open(dv, O_RDONLY); |
fe80f49b | 379 | if (fd2 >= 0 && |
3da92f27 | 380 | st->ss->load_super(st, fd2, NULL) == 0) { |
fe80f49b | 381 | close(fd2); |
3da92f27 | 382 | st->ss->uuid_from_super(st, uuid); |
fe80f49b NB |
383 | break; |
384 | } | |
385 | close(fd2); | |
386 | } | |
387 | if (d == max_devs) { | |
388 | fprintf(stderr, Name ": cannot find UUID for array!\n"); | |
389 | return 1; | |
390 | } | |
8fac0577 | 391 | if (CreateBitmap(file, force, (char*)uuid, chunk, |
f9c25f1d | 392 | delay, write_behind, bitmapsize, major)) { |
fe80f49b NB |
393 | return 1; |
394 | } | |
395 | bitmap_fd = open(file, O_RDWR); | |
396 | if (bitmap_fd < 0) { | |
8fac0577 | 397 | fprintf(stderr, Name ": weird: %s cannot be opened\n", |
fe80f49b NB |
398 | file); |
399 | return 1; | |
400 | } | |
401 | if (ioctl(fd, SET_BITMAP_FILE, bitmap_fd) < 0) { | |
402 | fprintf(stderr, Name ": Cannot set bitmap file for %s: %s\n", | |
403 | devname, strerror(errno)); | |
404 | return 1; | |
405 | } | |
406 | } | |
f5e166fe NB |
407 | |
408 | return 0; | |
409 | } | |
410 | ||
e86c9dd6 NB |
411 | |
412 | /* | |
413 | * When reshaping an array we might need to backup some data. | |
414 | * This is written to all spares with a 'super_block' describing it. | |
ff94fb86 | 415 | * The superblock goes 4K from the end of the used space on the |
e86c9dd6 NB |
416 | * device. |
417 | * It if written after the backup is complete. | |
418 | * It has the following structure. | |
419 | */ | |
420 | ||
5fdf37e3 | 421 | static struct mdp_backup_super { |
7236ee7a | 422 | char magic[16]; /* md_backup_data-1 or -2 */ |
e86c9dd6 NB |
423 | __u8 set_uuid[16]; |
424 | __u64 mtime; | |
425 | /* start/sizes in 512byte sectors */ | |
7236ee7a | 426 | __u64 devstart; /* address on backup device/file of data */ |
e86c9dd6 NB |
427 | __u64 arraystart; |
428 | __u64 length; | |
429 | __u32 sb_csum; /* csum of preceeding bytes. */ | |
7236ee7a N |
430 | __u32 pad1; |
431 | __u64 devstart2; /* offset in to data of second section */ | |
432 | __u64 arraystart2; | |
433 | __u64 length2; | |
434 | __u32 sb_csum2; /* csum of preceeding bytes. */ | |
435 | __u8 pad[512-68-32]; | |
5fdf37e3 | 436 | } __attribute__((aligned(512))) bsb, bsb2; |
e86c9dd6 | 437 | |
4411fb17 | 438 | static __u32 bsb_csum(char *buf, int len) |
e86c9dd6 NB |
439 | { |
440 | int i; | |
441 | int csum = 0; | |
442 | for (i=0; i<len; i++) | |
443 | csum = (csum<<3) + buf[0]; | |
444 | return __cpu_to_le32(csum); | |
445 | } | |
446 | ||
7236ee7a N |
447 | static int child_grow(int afd, struct mdinfo *sra, unsigned long blocks, |
448 | int *fds, unsigned long long *offsets, | |
449 | int disks, int chunk, int level, int layout, int data, | |
450 | int dests, int *destfd, unsigned long long *destoffsets); | |
451 | static int child_shrink(int afd, struct mdinfo *sra, unsigned long blocks, | |
452 | int *fds, unsigned long long *offsets, | |
453 | int disks, int chunk, int level, int layout, int data, | |
454 | int dests, int *destfd, unsigned long long *destoffsets); | |
455 | static int child_same_size(int afd, struct mdinfo *sra, unsigned long blocks, | |
456 | int *fds, unsigned long long *offsets, | |
e9e43ec3 | 457 | unsigned long long start, |
7236ee7a N |
458 | int disks, int chunk, int level, int layout, int data, |
459 | int dests, int *destfd, unsigned long long *destoffsets); | |
460 | ||
4411fb17 | 461 | static int freeze_array(struct mdinfo *sra) |
7236ee7a N |
462 | { |
463 | /* Try to freeze resync on this array. | |
464 | * Return -1 if the array is busy, | |
465 | * return 0 if this kernel doesn't support 'frozen' | |
466 | * return 1 if it worked. | |
467 | */ | |
468 | char buf[20]; | |
469 | if (sysfs_get_str(sra, NULL, "sync_action", buf, 20) <= 0) | |
470 | return 0; | |
471 | if (strcmp(buf, "idle\n") != 0 && | |
472 | strcmp(buf, "frozen\n") != 0) | |
473 | return -1; | |
474 | if (sysfs_set_str(sra, NULL, "sync_action", "frozen") < 0) | |
475 | return 0; | |
476 | return 1; | |
477 | } | |
478 | ||
4411fb17 | 479 | static void unfreeze_array(struct mdinfo *sra, int frozen) |
7236ee7a N |
480 | { |
481 | /* If 'frozen' is 1, unfreeze the array */ | |
482 | if (frozen > 0) | |
483 | sysfs_set_str(sra, NULL, "sync_action", "idle"); | |
484 | } | |
485 | ||
4411fb17 | 486 | static void wait_reshape(struct mdinfo *sra) |
7236ee7a N |
487 | { |
488 | int fd = sysfs_get_fd(sra, NULL, "sync_action"); | |
489 | char action[20]; | |
490 | ||
491 | do { | |
492 | fd_set rfds; | |
493 | FD_ZERO(&rfds); | |
494 | FD_SET(fd, &rfds); | |
495 | select(fd+1, NULL, NULL, &rfds, NULL); | |
496 | ||
497 | if (sysfs_fd_get_str(fd, action, 20) < 0) { | |
498 | close(fd); | |
499 | return; | |
500 | } | |
501 | } while (strncmp(action, "reshape", 7) == 0); | |
502 | } | |
7bc71196 DW |
503 | |
504 | static int reshape_super(struct supertype *st, long long size, int level, | |
505 | int layout, int chunksize, int raid_disks, | |
506 | char *backup_file, char *dev, int verbose) | |
507 | { | |
508 | /* nothing extra to check in the native case */ | |
509 | if (!st->ss->external) | |
510 | return 0; | |
511 | if (!st->ss->reshape_super || | |
512 | !st->ss->manage_reshape) { | |
513 | fprintf(stderr, Name ": %s metadata does not support reshape\n", | |
514 | st->ss->name); | |
515 | return 1; | |
516 | } | |
517 | ||
518 | return st->ss->reshape_super(st, size, level, layout, chunksize, | |
519 | raid_disks, backup_file, dev, verbose); | |
520 | } | |
521 | ||
522 | static void sync_metadata(struct supertype *st) | |
523 | { | |
524 | if (st->ss->external) { | |
525 | if (st->update_tail) | |
526 | flush_metadata_updates(st); | |
527 | else | |
528 | st->ss->sync_metadata(st); | |
529 | } | |
530 | } | |
531 | ||
532 | static int subarray_set_num(char *container, struct mdinfo *sra, char *name, int n) | |
533 | { | |
534 | /* when dealing with external metadata subarrays we need to be | |
535 | * prepared to handle EAGAIN. The kernel may need to wait for | |
536 | * mdmon to mark the array active so the kernel can handle | |
537 | * allocations/writeback when preparing the reshape action | |
538 | * (md_allow_write()). We temporarily disable safe_mode_delay | |
539 | * to close a race with the array_state going clean before the | |
540 | * next write to raid_disks / stripe_cache_size | |
541 | */ | |
542 | char safe[50]; | |
543 | int rc; | |
544 | ||
545 | /* only 'raid_disks' and 'stripe_cache_size' trigger md_allow_write */ | |
546 | if (strcmp(name, "raid_disks") != 0 && | |
547 | strcmp(name, "stripe_cache_size") != 0) | |
548 | return sysfs_set_num(sra, NULL, name, n); | |
549 | ||
550 | rc = sysfs_get_str(sra, NULL, "safe_mode_delay", safe, sizeof(safe)); | |
551 | if (rc <= 0) | |
552 | return -1; | |
553 | sysfs_set_num(sra, NULL, "safe_mode_delay", 0); | |
554 | rc = sysfs_set_num(sra, NULL, name, n); | |
555 | if (rc < 0 && errno == EAGAIN) { | |
556 | ping_monitor(container); | |
557 | /* if we get EAGAIN here then the monitor is not active | |
558 | * so stop trying | |
559 | */ | |
560 | rc = sysfs_set_num(sra, NULL, name, n); | |
561 | } | |
562 | sysfs_set_str(sra, NULL, "safe_mode_delay", safe); | |
563 | return rc; | |
564 | } | |
565 | ||
566 | static int reshape_container_raid_disks(char *container, int raid_disks) | |
567 | { | |
568 | /* for each subarray switch to a raid level that can | |
569 | * support the reshape, and set raid disks | |
570 | */ | |
571 | struct mdstat_ent *ent, *e; | |
572 | int changed = 0, rv = 0, err = 0; | |
573 | ||
574 | ent = mdstat_read(1, 0); | |
575 | if (!ent) { | |
576 | fprintf(stderr, Name ": unable to read /proc/mdstat\n"); | |
577 | return -1; | |
578 | } | |
579 | ||
580 | changed = 0; | |
581 | for (e = ent; e; e = e->next) { | |
582 | struct mdinfo *sub; | |
583 | unsigned int cache; | |
584 | int level, takeover_delta = 0; | |
585 | ||
586 | if (!is_container_member(e, container)) | |
587 | continue; | |
588 | ||
589 | level = map_name(pers, e->level); | |
590 | if (level == 0) { | |
591 | sub = sysfs_read(-1, e->devnum, GET_VERSION); | |
592 | if (!sub) | |
593 | break; | |
594 | /* metadata records 'orig_level' */ | |
595 | rv = sysfs_set_num(sub, NULL, "level", 4); | |
596 | if (rv < 0) { | |
597 | err = errno; | |
598 | break; | |
599 | } | |
600 | /* we want spares to be used for capacity | |
601 | * expansion, not rebuild | |
602 | */ | |
603 | takeover_delta = 1; | |
604 | ||
605 | sysfs_free(sub); | |
606 | level = 4; | |
607 | } | |
608 | ||
609 | sub = NULL; | |
610 | switch (level) { | |
611 | default: | |
612 | rv = -1; | |
613 | break; | |
614 | case 4: | |
615 | case 5: | |
616 | case 6: | |
617 | sub = sysfs_read(-1, e->devnum, GET_CHUNK|GET_CACHE); | |
618 | if (!sub) | |
619 | break; | |
620 | cache = (sub->array.chunk_size / 4096) * 4; | |
621 | if (cache > sub->cache_size) | |
622 | rv = subarray_set_num(container, sub, | |
623 | "stripe_cache_size", cache); | |
624 | if (rv) { | |
625 | err = errno; | |
626 | break; | |
627 | } | |
628 | /* fall through */ | |
629 | case 1: | |
630 | if (!sub) | |
631 | sub = sysfs_read(-1, e->devnum, GET_VERSION); | |
632 | if (!sub) | |
633 | break; | |
634 | ||
635 | rv = subarray_set_num(container, sub, "raid_disks", | |
636 | raid_disks + takeover_delta); | |
637 | if (rv) | |
638 | err = errno; | |
639 | else | |
640 | changed++; | |
641 | break; | |
642 | } | |
643 | sysfs_free(sub); | |
644 | if (rv) | |
645 | break; | |
646 | } | |
647 | free_mdstat(ent); | |
648 | if (rv) { | |
649 | fprintf(stderr, Name | |
650 | ": failed to initiate container reshape%s%s\n", | |
651 | err ? ": " : "", err ? strerror(err) : ""); | |
652 | return rv; | |
653 | } | |
654 | ||
655 | return changed; | |
656 | } | |
657 | ||
658 | static void revert_container_raid_disks(struct supertype *st, int fd, char *container) | |
659 | { | |
660 | /* we failed to prepare all subarrays in the container for | |
661 | * reshape, so cancel the changes and restore the nominal raid | |
662 | * level | |
663 | */ | |
664 | struct mdstat_ent *ent, *e; | |
665 | ||
666 | ent = mdstat_read(0, 0); | |
667 | if (!ent) { | |
668 | fprintf(stderr, Name | |
669 | ": failed to read /proc/mdstat while aborting reshape\n"); | |
670 | return; | |
671 | } | |
672 | ||
673 | for (e = ent; e; e = e->next) { | |
674 | int level_fixed = 0, disks_fixed = 0; | |
675 | struct mdinfo *sub, prev; | |
676 | ||
677 | if (!is_container_member(e, container)) | |
678 | continue; | |
679 | ||
680 | st->ss->free_super(st); | |
681 | sprintf(st->subarray, "%s", to_subarray(e, container)); | |
682 | if (st->ss->load_super(st, fd, NULL)) { | |
683 | fprintf(stderr, Name | |
684 | ": failed read metadata while aborting reshape\n"); | |
685 | continue; | |
686 | } | |
687 | st->ss->getinfo_super(st, &prev); | |
688 | ||
689 | /* changing level might change raid_disks so we do it | |
690 | * first and then check if raid_disks still needs fixing | |
691 | */ | |
692 | if (map_name(pers, e->level) != prev.array.level) { | |
693 | sub = sysfs_read(-1, e->devnum, GET_VERSION); | |
694 | if (sub && | |
695 | !sysfs_set_num(sub, NULL, "level", prev.array.level)) | |
696 | level_fixed = 1; | |
697 | sysfs_free(sub); | |
698 | } else | |
699 | level_fixed = 1; | |
700 | ||
701 | sub = sysfs_read(-1, e->devnum, GET_DISKS); | |
702 | if (sub && sub->array.raid_disks != prev.array.raid_disks) { | |
703 | if (!subarray_set_num(container, sub, "raid_disks", | |
704 | prev.array.raid_disks)) | |
705 | disks_fixed = 1; | |
706 | } else if (sub) | |
707 | disks_fixed = 1; | |
708 | sysfs_free(sub); | |
709 | ||
710 | if (!disks_fixed || !level_fixed) | |
711 | fprintf(stderr, Name | |
712 | ": failed to restore %s to a %d-disk %s array\n", | |
713 | e->dev, prev.array.raid_disks, | |
714 | map_num(pers, prev.array.level)); | |
715 | } | |
716 | free_mdstat(ent); | |
717 | } | |
718 | ||
06b0d786 | 719 | int Grow_reshape(char *devname, int fd, int quiet, char *backup_file, |
e86c9dd6 | 720 | long long size, |
19678e53 | 721 | int level, char *layout_str, int chunksize, int raid_disks) |
e86c9dd6 NB |
722 | { |
723 | /* Make some changes in the shape of an array. | |
724 | * The kernel must support the change. | |
7236ee7a N |
725 | * |
726 | * There are three different changes. Each can trigger | |
727 | * a resync or recovery so we freeze that until we have | |
728 | * requested everything (if kernel supports freezing - 2.6.30). | |
729 | * The steps are: | |
730 | * - change size (i.e. component_size) | |
731 | * - change level | |
732 | * - change layout/chunksize/ndisks | |
733 | * | |
734 | * The last can require a reshape. It is different on different | |
735 | * levels so we need to check the level before actioning it. | |
736 | * Some times the level change needs to be requested after the | |
737 | * reshape (e.g. raid6->raid5, raid5->raid0) | |
738 | * | |
e86c9dd6 | 739 | */ |
7236ee7a | 740 | struct mdu_array_info_s array, orig; |
e86c9dd6 | 741 | char *c; |
7236ee7a | 742 | int rv = 0; |
e86c9dd6 | 743 | struct supertype *st; |
4725bc31 | 744 | char *subarray = NULL; |
e86c9dd6 | 745 | |
e86c9dd6 NB |
746 | int nchunk, ochunk; |
747 | int nlayout, olayout; | |
748 | int ndisks, odisks; | |
f21e18ca | 749 | unsigned int ndata, odata; |
7236ee7a N |
750 | int orig_level = UnSet; |
751 | char alt_layout[40]; | |
e86c9dd6 NB |
752 | int *fdlist; |
753 | unsigned long long *offsets; | |
7236ee7a | 754 | int d, i; |
e86c9dd6 NB |
755 | int nrdisks; |
756 | int err; | |
7236ee7a N |
757 | int frozen; |
758 | unsigned long a,b, blocks, stripes; | |
f21e18ca | 759 | unsigned long cache; |
7236ee7a N |
760 | unsigned long long array_size; |
761 | int changed = 0; | |
7bc71196 DW |
762 | char *container = NULL; |
763 | int cfd = -1; | |
7236ee7a | 764 | int done; |
e86c9dd6 | 765 | |
7e0f6979 | 766 | struct mdinfo *sra; |
06c7f68e | 767 | struct mdinfo *sd; |
e86c9dd6 NB |
768 | |
769 | if (ioctl(fd, GET_ARRAY_INFO, &array) < 0) { | |
770 | fprintf(stderr, Name ": %s is not an active md array - aborting\n", | |
771 | devname); | |
772 | return 1; | |
773 | } | |
24d40069 | 774 | |
9ce510be N |
775 | if (size >= 0 && |
776 | (chunksize || level!= UnSet || layout_str || raid_disks)) { | |
777 | fprintf(stderr, Name ": cannot change component size at the same time " | |
778 | "as other changes.\n" | |
779 | " Change size first, then check data is intact before " | |
780 | "making other changes.\n"); | |
781 | return 1; | |
782 | } | |
783 | ||
24d40069 N |
784 | if (raid_disks && raid_disks < array.raid_disks && array.level > 1 && |
785 | get_linux_version() < 2006032 && | |
786 | !check_env("MDADM_FORCE_FEWER")) { | |
787 | fprintf(stderr, Name ": reducing the number of devices is not safe before Linux 2.6.32\n" | |
788 | " Please use a newer kernel\n"); | |
789 | return 1; | |
790 | } | |
7bc71196 DW |
791 | |
792 | st = super_by_fd(fd, &subarray); | |
793 | if (!st) { | |
794 | fprintf(stderr, Name ": Unable to determine metadata format for %s\n", devname); | |
795 | return 1; | |
796 | } | |
797 | ||
798 | /* in the external case we need to check that the requested reshape is | |
799 | * supported, and perform an initial check that the container holds the | |
800 | * pre-requisite spare devices (mdmon owns final validation) | |
801 | */ | |
802 | if (st->ss->external) { | |
803 | int container_dev; | |
804 | ||
805 | if (subarray) { | |
806 | container_dev = st->container_dev; | |
807 | cfd = open_dev_excl(st->container_dev); | |
808 | } else if (size >= 0 || layout_str != NULL || chunksize != 0 || | |
809 | level != UnSet) { | |
810 | fprintf(stderr, | |
811 | Name ": %s is a container, only 'raid-devices' can be changed\n", | |
812 | devname); | |
813 | return 1; | |
814 | } else { | |
815 | container_dev = st->devnum; | |
816 | close(fd); | |
817 | cfd = open_dev_excl(st->devnum); | |
818 | fd = cfd; | |
819 | } | |
820 | if (cfd < 0) { | |
821 | fprintf(stderr, Name ": Unable to open container for %s\n", | |
822 | devname); | |
823 | return 1; | |
824 | } | |
825 | ||
826 | container = devnum2devname(st->devnum); | |
827 | if (!container) { | |
828 | fprintf(stderr, Name ": Could not determine container name\n"); | |
829 | return 1; | |
830 | } | |
831 | ||
832 | if (st->ss->load_super(st, cfd, NULL)) { | |
833 | fprintf(stderr, Name ": Cannot read superblock for %s\n", | |
834 | devname); | |
835 | return 1; | |
836 | } | |
837 | ||
838 | if (mdmon_running(container_dev)) | |
839 | st->update_tail = &st->updates; | |
840 | } | |
841 | ||
7236ee7a | 842 | sra = sysfs_read(fd, 0, GET_LEVEL); |
7bc71196 DW |
843 | if (sra) { |
844 | if (st->ss->external && st->subarray[0] == 0) { | |
845 | array.level = LEVEL_CONTAINER; | |
846 | sra->array.level = LEVEL_CONTAINER; | |
847 | } | |
b526e52d | 848 | frozen = freeze_array(sra); |
7bc71196 | 849 | } else { |
b526e52d DW |
850 | fprintf(stderr, Name ": failed to read sysfs parameters for %s\n", |
851 | devname); | |
852 | return 1; | |
853 | } | |
7236ee7a N |
854 | if (frozen < 0) { |
855 | fprintf(stderr, Name ": %s is performing resync/recovery and cannot" | |
856 | " be reshaped\n", devname); | |
857 | return 1; | |
858 | } | |
859 | ||
7bc71196 | 860 | |
7236ee7a N |
861 | /* ========= set size =============== */ |
862 | if (size >= 0 && (size == 0 || size != array.size)) { | |
7bc71196 DW |
863 | long long orig_size = array.size; |
864 | ||
865 | if (reshape_super(st, size, UnSet, UnSet, 0, 0, NULL, devname, !quiet)) { | |
866 | rv = 1; | |
867 | goto release; | |
868 | } | |
869 | sync_metadata(st); | |
7236ee7a N |
870 | array.size = size; |
871 | if (array.size != size) { | |
872 | /* got truncated to 32bit, write to | |
873 | * component_size instead | |
874 | */ | |
875 | if (sra) | |
876 | rv = sysfs_set_num(sra, NULL, | |
877 | "component_size", size); | |
878 | else | |
879 | rv = -1; | |
880 | } else | |
881 | rv = ioctl(fd, SET_ARRAY_INFO, &array); | |
882 | if (rv != 0) { | |
39bbb392 | 883 | int err = errno; |
7bc71196 DW |
884 | |
885 | /* restore metadata */ | |
886 | if (reshape_super(st, orig_size, UnSet, UnSet, 0, 0, | |
887 | NULL, devname, !quiet) == 0) | |
888 | sync_metadata(st); | |
7236ee7a | 889 | fprintf(stderr, Name ": Cannot set device size for %s: %s\n", |
39bbb392 N |
890 | devname, strerror(err)); |
891 | if (err == EBUSY && | |
892 | (array.state & (1<<MD_SB_BITMAP_PRESENT))) | |
893 | fprintf(stderr, " Bitmap must be removed before size can be changed\n"); | |
7236ee7a N |
894 | rv = 1; |
895 | goto release; | |
896 | } | |
897 | ioctl(fd, GET_ARRAY_INFO, &array); | |
be1cabbd | 898 | size = get_component_size(fd)/2; |
f98841b3 N |
899 | if (size == 0) |
900 | size = array.size; | |
7236ee7a | 901 | if (!quiet) |
f98841b3 N |
902 | fprintf(stderr, Name ": component size of %s has been set to %lluK\n", |
903 | devname, size); | |
7236ee7a | 904 | changed = 1; |
7bc71196 | 905 | } else if (array.level != LEVEL_CONTAINER) { |
be1cabbd | 906 | size = get_component_size(fd)/2; |
f98841b3 N |
907 | if (size == 0) |
908 | size = array.size; | |
7236ee7a N |
909 | } |
910 | ||
911 | /* ======= set level =========== */ | |
912 | if (level != UnSet && level != array.level) { | |
913 | /* Trying to change the level. | |
914 | * We might need to change layout first and schedule a | |
915 | * level change for later. | |
916 | * Level changes that can happen immediately are: | |
917 | * 0->4,5,6 1->5 4->5,6 5->1,6 | |
918 | * Level changes that need a layout change first are: | |
919 | * 6->5,4,0 : need a -6 layout, or parity-last | |
920 | * 5->4,0 : need parity-last | |
921 | */ | |
922 | if ((array.level == 6 || array.level == 5) && | |
923 | (level == 5 || level == 4 || level == 0)) { | |
924 | /* Don't change level yet, but choose intermediate | |
925 | * layout | |
926 | */ | |
927 | if (level == 5) { | |
928 | if (layout_str == NULL) | |
929 | switch (array.layout) { | |
930 | case ALGORITHM_LEFT_ASYMMETRIC: | |
931 | case ALGORITHM_LEFT_ASYMMETRIC_6: | |
932 | case ALGORITHM_ROTATING_N_RESTART: | |
933 | layout_str = "left-asymmetric-6"; | |
934 | break; | |
935 | case ALGORITHM_LEFT_SYMMETRIC: | |
936 | case ALGORITHM_LEFT_SYMMETRIC_6: | |
937 | case ALGORITHM_ROTATING_N_CONTINUE: | |
938 | layout_str = "left-symmetric-6"; | |
939 | break; | |
940 | case ALGORITHM_RIGHT_ASYMMETRIC: | |
941 | case ALGORITHM_RIGHT_ASYMMETRIC_6: | |
942 | case ALGORITHM_ROTATING_ZERO_RESTART: | |
943 | layout_str = "right-asymmetric-6"; | |
944 | break; | |
945 | case ALGORITHM_RIGHT_SYMMETRIC: | |
946 | case ALGORITHM_RIGHT_SYMMETRIC_6: | |
947 | layout_str = "right-symmetric-6"; | |
948 | break; | |
949 | case ALGORITHM_PARITY_0: | |
950 | case ALGORITHM_PARITY_0_6: | |
951 | layout_str = "parity-first-6"; | |
952 | break; | |
953 | case ALGORITHM_PARITY_N: | |
954 | layout_str = "parity-last"; | |
955 | break; | |
956 | default: | |
957 | fprintf(stderr, Name ": %s: cannot" | |
958 | "convert layout to RAID5 equivalent\n", | |
959 | devname); | |
960 | rv = 1; | |
961 | goto release; | |
962 | } | |
963 | else { | |
964 | int l = map_name(r5layout, layout_str); | |
965 | if (l == UnSet) { | |
966 | fprintf(stderr, Name ": %s: layout '%s' not recognised\n", | |
967 | devname, layout_str); | |
968 | rv = 1; | |
969 | goto release; | |
970 | } | |
971 | if (l != ALGORITHM_PARITY_N) { | |
972 | /* need the -6 version */ | |
973 | char *ls = map_num(r5layout, l); | |
974 | strcat(strcpy(alt_layout, ls), | |
975 | "-6"); | |
976 | layout_str = alt_layout; | |
977 | } | |
978 | } | |
979 | if (raid_disks) | |
24d40069 | 980 | /* The final raid6->raid5 conversion |
7236ee7a N |
981 | * will reduce the number of disks, |
982 | * so now we need to aim higher | |
983 | */ | |
984 | raid_disks++; | |
985 | } else | |
986 | layout_str = "parity-last"; | |
987 | } else { | |
7bc71196 DW |
988 | /* Level change is a simple takeover. In the external |
989 | * case we don't check with the metadata handler until | |
990 | * we establish what the final layout will be. If the | |
991 | * level change is disallowed we will revert to | |
992 | * orig_level without disturbing the metadata, otherwise | |
993 | * we will send an update. | |
994 | */ | |
7236ee7a | 995 | c = map_num(pers, level); |
b5ea446a N |
996 | if (c == NULL) { |
997 | rv = 1;/* not possible */ | |
998 | goto release; | |
999 | } | |
7236ee7a N |
1000 | err = sysfs_set_str(sra, NULL, "level", c); |
1001 | if (err) { | |
39bbb392 | 1002 | err = errno; |
7236ee7a N |
1003 | fprintf(stderr, Name ": %s: could not set level to %s\n", |
1004 | devname, c); | |
39bbb392 N |
1005 | if (err == EBUSY && |
1006 | (array.state & (1<<MD_SB_BITMAP_PRESENT))) | |
1007 | fprintf(stderr, " Bitmap must be removed before level can be changed\n"); | |
7236ee7a N |
1008 | rv = 1; |
1009 | goto release; | |
1010 | } | |
1011 | orig = array; | |
1012 | orig_level = orig.level; | |
1013 | ioctl(fd, GET_ARRAY_INFO, &array); | |
1014 | if (layout_str == NULL && | |
1015 | orig.level == 5 && level == 6 && | |
1016 | array.layout != orig.layout) | |
1017 | layout_str = map_num(r5layout, orig.layout); | |
1018 | if (!quiet) | |
1019 | fprintf(stderr, Name " level of %s changed to %s\n", | |
1020 | devname, c); | |
1021 | changed = 1; | |
1022 | } | |
1023 | } | |
1024 | ||
1025 | /* ========= set shape (chunk_size / layout / ndisks) ============== */ | |
1026 | /* Check if layout change is a no-op */ | |
7bc71196 | 1027 | switch (array.level) { |
7236ee7a | 1028 | case 5: |
72e4a378 | 1029 | if (layout_str && array.layout == map_name(r5layout, layout_str)) |
7236ee7a N |
1030 | layout_str = NULL; |
1031 | break; | |
1032 | case 6: | |
1033 | if (layout_str == NULL && | |
1034 | ((chunksize && chunksize * 1024 != array.chunk_size) || | |
1035 | (raid_disks && raid_disks != array.raid_disks)) && | |
1036 | array.layout >= 16) { | |
1037 | fprintf(stderr, Name | |
1038 | ": %s has a non-standard layout. If you wish to preserve this\n" | |
1039 | " during the reshape, please specify --layout=preserve\n" | |
1040 | " If you want to change it, specify a layout or use --layout=normalise\n", | |
1041 | devname); | |
1042 | rv = 1; | |
1043 | goto release; | |
1044 | } | |
72e4a378 DW |
1045 | if (layout_str && |
1046 | (strcmp(layout_str, "normalise") == 0 || | |
1047 | strcmp(layout_str, "normalize") == 0)) { | |
7236ee7a N |
1048 | char *hyphen; |
1049 | strcpy(alt_layout, map_num(r6layout, array.layout)); | |
1050 | hyphen = strrchr(alt_layout, '-'); | |
1051 | if (hyphen && strcmp(hyphen, "-6") == 0) { | |
1052 | *hyphen = 0; | |
1053 | layout_str = alt_layout; | |
1054 | } | |
1055 | } | |
1056 | ||
72e4a378 | 1057 | if (layout_str && array.layout == map_name(r6layout, layout_str)) |
7236ee7a N |
1058 | layout_str = NULL; |
1059 | if (layout_str && strcmp(layout_str, "preserve") == 0) | |
1060 | layout_str = NULL; | |
1061 | break; | |
1062 | } | |
1063 | if (layout_str == NULL | |
1064 | && (chunksize == 0 || chunksize*1024 == array.chunk_size) | |
1065 | && (raid_disks == 0 || raid_disks == array.raid_disks)) { | |
7bc71196 DW |
1066 | if (reshape_super(st, -1, level, UnSet, 0, 0, NULL, devname, !quiet)) { |
1067 | rv = 1; | |
1068 | goto release; | |
1069 | } | |
1070 | sync_metadata(st); | |
7236ee7a N |
1071 | rv = 0; |
1072 | if (level != UnSet && level != array.level) { | |
1073 | /* Looks like this level change doesn't need | |
1074 | * a reshape after all. | |
1075 | */ | |
1076 | c = map_num(pers, level); | |
1077 | if (c) { | |
1078 | rv = sysfs_set_str(sra, NULL, "level", c); | |
39bbb392 N |
1079 | if (rv) { |
1080 | int err = errno; | |
7236ee7a N |
1081 | fprintf(stderr, Name ": %s: could not set level to %s\n", |
1082 | devname, c); | |
39bbb392 N |
1083 | if (err == EBUSY && |
1084 | (array.state & (1<<MD_SB_BITMAP_PRESENT))) | |
1085 | fprintf(stderr, " Bitmap must be removed before level can be changed\n"); | |
b7e734fc | 1086 | rv = 1; |
39bbb392 | 1087 | } |
7236ee7a N |
1088 | } |
1089 | } else if (!changed && !quiet) | |
1090 | fprintf(stderr, Name ": %s: no change requested\n", | |
1091 | devname); | |
7bc71196 DW |
1092 | |
1093 | if (st->ss->external && !mdmon_running(st->container_dev) && | |
1094 | level > 0) { | |
1095 | start_mdmon(st->container_dev); | |
1096 | ping_monitor(container); | |
1097 | } | |
7236ee7a N |
1098 | goto release; |
1099 | } | |
1100 | ||
e86c9dd6 NB |
1101 | c = map_num(pers, array.level); |
1102 | if (c == NULL) c = "-unknown-"; | |
7bc71196 | 1103 | switch (array.level) { |
e86c9dd6 NB |
1104 | default: /* raid0, linear, multipath cannot be reconfigured */ |
1105 | fprintf(stderr, Name ": %s array %s cannot be reshaped.\n", | |
1106 | c, devname); | |
7bc71196 | 1107 | /* TODO raid0 raiddisks can be reshaped via raid4 */ |
7236ee7a N |
1108 | rv = 1; |
1109 | break; | |
7bc71196 DW |
1110 | case LEVEL_CONTAINER: { |
1111 | int count; | |
1112 | ||
1113 | /* double check that we are not changing anything but raid_disks */ | |
1114 | if (size >= 0 || layout_str != NULL || chunksize != 0 || level != UnSet) { | |
1115 | fprintf(stderr, | |
1116 | Name ": %s is a container, only 'raid-devices' can be changed\n", | |
1117 | devname); | |
1118 | rv = 1; | |
1119 | goto release; | |
1120 | } | |
1121 | ||
1122 | st->update_tail = &st->updates; | |
1123 | if (reshape_super(st, -1, UnSet, UnSet, 0, raid_disks, | |
1124 | backup_file, devname, !quiet)) { | |
1125 | rv = 1; | |
1126 | goto release; | |
1127 | } | |
1128 | ||
1129 | count = reshape_container_raid_disks(container, raid_disks); | |
1130 | if (count < 0) { | |
1131 | revert_container_raid_disks(st, fd, container); | |
1132 | rv = 1; | |
1133 | goto release; | |
1134 | } else if (count == 0) { | |
1135 | if (!quiet) | |
1136 | fprintf(stderr, Name | |
1137 | ": no active subarrays to reshape\n"); | |
1138 | goto release; | |
1139 | } | |
e86c9dd6 | 1140 | |
7bc71196 DW |
1141 | if (!mdmon_running(st->devnum)) { |
1142 | start_mdmon(st->devnum); | |
1143 | ping_monitor(container); | |
1144 | } | |
1145 | sync_metadata(st); | |
1146 | ||
1147 | /* give mdmon a chance to allocate spares */ | |
1148 | ping_manager(container); | |
1149 | ||
1150 | /* manage_reshape takes care of releasing the array(s) */ | |
1151 | st->ss->manage_reshape(st, backup_file); | |
1152 | frozen = 0; | |
1153 | goto release; | |
1154 | } | |
e86c9dd6 NB |
1155 | case LEVEL_FAULTY: /* only 'layout' change is permitted */ |
1156 | ||
e86c9dd6 NB |
1157 | if (chunksize || raid_disks) { |
1158 | fprintf(stderr, Name ": %s: Cannot change chunksize or disks of a 'faulty' array\n", | |
1159 | devname); | |
7236ee7a N |
1160 | rv = 1; |
1161 | break; | |
e86c9dd6 | 1162 | } |
19678e53 | 1163 | if (layout_str == NULL) |
7236ee7a | 1164 | break; /* nothing to do.... */ |
e86c9dd6 | 1165 | |
19678e53 N |
1166 | array.layout = parse_layout_faulty(layout_str); |
1167 | if (array.layout < 0) { | |
1168 | fprintf(stderr, Name ": %s: layout %s not understood for 'faulty' array\n", | |
1169 | devname, layout_str); | |
7236ee7a N |
1170 | rv = 1; |
1171 | break; | |
19678e53 | 1172 | } |
e86c9dd6 NB |
1173 | if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) { |
1174 | fprintf(stderr, Name ": Cannot set layout for %s: %s\n", | |
1175 | devname, strerror(errno)); | |
7236ee7a N |
1176 | rv = 1; |
1177 | } else if (!quiet) | |
e86c9dd6 | 1178 | printf("layout for %s set to %d\n", devname, array.layout); |
7236ee7a | 1179 | break; |
e86c9dd6 | 1180 | |
7236ee7a | 1181 | case 1: /* only raid_disks can each be changed. */ |
e86c9dd6 | 1182 | |
19678e53 | 1183 | if (chunksize || layout_str != NULL) { |
7236ee7a | 1184 | fprintf(stderr, Name ": %s: Cannot change chunk size or layout for a RAID1 array.\n", |
e86c9dd6 | 1185 | devname); |
7236ee7a N |
1186 | rv = 1; |
1187 | break; | |
e86c9dd6 | 1188 | } |
9860f271 | 1189 | if (raid_disks > 0) { |
7bc71196 DW |
1190 | if (reshape_super(st, -1, UnSet, UnSet, 0, raid_disks, |
1191 | NULL, devname, !quiet)) { | |
1192 | rv = 1; | |
1193 | goto release; | |
1194 | } | |
1195 | sync_metadata(st); | |
e86c9dd6 | 1196 | array.raid_disks = raid_disks; |
9860f271 NB |
1197 | if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) { |
1198 | fprintf(stderr, Name ": Cannot set raid-devices for %s: %s\n", | |
1199 | devname, strerror(errno)); | |
7236ee7a | 1200 | rv = 1; |
9860f271 | 1201 | } |
e86c9dd6 | 1202 | } |
7236ee7a | 1203 | break; |
e86c9dd6 NB |
1204 | |
1205 | case 4: | |
1206 | case 5: | |
1207 | case 6: | |
1686dc25 | 1208 | |
7236ee7a N |
1209 | /* |
1210 | * layout/chunksize/raid_disks can be changed | |
e86c9dd6 | 1211 | * though the kernel may not support it all. |
e86c9dd6 | 1212 | */ |
4725bc31 N |
1213 | if (subarray) { |
1214 | fprintf(stderr, Name ": Cannot reshape subarrays yet\n"); | |
1215 | break; | |
1216 | } | |
7236ee7a N |
1217 | |
1218 | /* | |
1219 | * There are three possibilities. | |
1220 | * 1/ The array will shrink. | |
1221 | * We need to ensure the reshape will pause before reaching | |
1222 | * the 'critical section'. We also need to fork and wait for | |
1223 | * that to happen. When it does we | |
1224 | * suspend/backup/complete/unfreeze | |
1225 | * | |
1226 | * 2/ The array will not change size. | |
1227 | * This requires that we keep a backup of a sliding window | |
1228 | * so that we can restore data after a crash. So we need | |
1229 | * to fork and monitor progress. | |
1230 | * | |
1231 | * 3/ The array will grow. This is relatively easy. | |
e86c9dd6 NB |
1232 | * However the kernel's restripe routines will cheerfully |
1233 | * overwrite some early data before it is safe. So we | |
1234 | * need to make a backup of the early parts of the array | |
1235 | * and be ready to restore it if rebuild aborts very early. | |
1236 | * | |
7236ee7a N |
1237 | * We backup data by writing it to one spare, or to a |
1238 | * file which was given on command line. | |
e86c9dd6 | 1239 | * |
7236ee7a | 1240 | * [FOLLOWING IS OLD AND PARTLY WRONG] |
e86c9dd6 NB |
1241 | * So: we enumerate the devices in the array and |
1242 | * make sure we can open all of them. | |
1243 | * Then we freeze the early part of the array and | |
1244 | * backup to the various spares. | |
1245 | * Then we request changes and start the reshape. | |
1246 | * Monitor progress until it has passed the danger zone. | |
1247 | * and finally invalidate the copied data and unfreeze the | |
1248 | * start of the array. | |
1249 | * | |
7236ee7a N |
1250 | * In each case, we first make sure that storage is available |
1251 | * for the required backup. | |
1252 | * Then we: | |
1253 | * - request the shape change. | |
1254 | * - for to handle backup etc. | |
e86c9dd6 | 1255 | */ |
e86c9dd6 NB |
1256 | nchunk = ochunk = array.chunk_size; |
1257 | nlayout = olayout = array.layout; | |
1258 | ndisks = odisks = array.raid_disks; | |
1259 | ||
7236ee7a N |
1260 | if (chunksize) { |
1261 | nchunk = chunksize * 1024; | |
f98841b3 N |
1262 | if (size % chunksize) { |
1263 | fprintf(stderr, Name ": component size %lluK is not" | |
7236ee7a | 1264 | " a multiple of chunksize %dK\n", |
f98841b3 | 1265 | size, chunksize); |
7236ee7a N |
1266 | break; |
1267 | } | |
1268 | } | |
19678e53 | 1269 | if (layout_str != NULL) |
7236ee7a | 1270 | switch(array.level) { |
19678e53 N |
1271 | case 4: /* ignore layout */ |
1272 | break; | |
1273 | case 5: | |
1274 | nlayout = map_name(r5layout, layout_str); | |
1275 | if (nlayout == UnSet) { | |
1276 | fprintf(stderr, Name ": layout %s not understood for raid5.\n", | |
1277 | layout_str); | |
b5ea446a N |
1278 | rv = 1; |
1279 | goto release; | |
19678e53 N |
1280 | } |
1281 | break; | |
1282 | ||
1283 | case 6: | |
1284 | nlayout = map_name(r6layout, layout_str); | |
1285 | if (nlayout == UnSet) { | |
1286 | fprintf(stderr, Name ": layout %s not understood for raid6.\n", | |
1287 | layout_str); | |
b5ea446a N |
1288 | rv = 1; |
1289 | goto release; | |
19678e53 N |
1290 | } |
1291 | break; | |
1292 | } | |
e86c9dd6 NB |
1293 | if (raid_disks) ndisks = raid_disks; |
1294 | ||
1295 | odata = odisks-1; | |
e86c9dd6 | 1296 | ndata = ndisks-1; |
7236ee7a N |
1297 | if (array.level == 6) { |
1298 | odata--; /* number of data disks */ | |
1299 | ndata--; | |
e86c9dd6 | 1300 | } |
7236ee7a | 1301 | |
d2505cff N |
1302 | if (odata == ndata && |
1303 | get_linux_version() < 2006032) { | |
1304 | fprintf(stderr, Name ": in-place reshape is not safe before 2.6.32, sorry.\n"); | |
1305 | break; | |
1306 | } | |
1307 | ||
7236ee7a | 1308 | /* Check that we can hold all the data */ |
7236ee7a | 1309 | get_dev_size(fd, NULL, &array_size); |
f21e18ca | 1310 | if (ndata * (unsigned long long)size < (array_size/1024)) { |
7236ee7a N |
1311 | fprintf(stderr, Name ": this change will reduce the size of the array.\n" |
1312 | " use --grow --array-size first to truncate array.\n" | |
1313 | " e.g. mdadm --grow %s --array-size %llu\n", | |
f98841b3 | 1314 | devname, ndata * size); |
7236ee7a N |
1315 | rv = 1; |
1316 | break; | |
e86c9dd6 | 1317 | } |
7236ee7a N |
1318 | |
1319 | /* So how much do we need to backup. | |
1320 | * We need an amount of data which is both a whole number of | |
1321 | * old stripes and a whole number of new stripes. | |
1322 | * So LCM for (chunksize*datadisks). | |
e86c9dd6 | 1323 | */ |
200871ad N |
1324 | a = (ochunk/512) * odata; |
1325 | b = (nchunk/512) * ndata; | |
7236ee7a N |
1326 | /* Find GCD */ |
1327 | while (a != b) { | |
1328 | if (a < b) | |
1329 | b -= a; | |
1330 | if (b < a) | |
1331 | a -= b; | |
e86c9dd6 | 1332 | } |
7236ee7a | 1333 | /* LCM == product / GCD */ |
200871ad | 1334 | blocks = (ochunk/512) * (nchunk/512) * odata * ndata / a; |
7236ee7a | 1335 | |
e380d3be N |
1336 | sysfs_free(sra); |
1337 | sra = sysfs_read(fd, 0, | |
1338 | GET_COMPONENT|GET_DEVS|GET_OFFSET|GET_STATE| | |
1339 | GET_CACHE); | |
1340 | ||
c03ef02d N |
1341 | if (!sra) { |
1342 | fprintf(stderr, Name ": %s: Cannot get array details from sysfs\n", | |
1343 | devname); | |
1344 | rv = 1; | |
1345 | break; | |
1346 | } | |
1347 | ||
eba71529 N |
1348 | if (ndata == odata) { |
1349 | /* Make 'blocks' bigger for better throughput, but | |
1350 | * not so big that we reject it below. | |
1b13faf7 | 1351 | * Try for 16 megabytes |
eba71529 | 1352 | */ |
1b13faf7 N |
1353 | while (blocks * 32 < sra->component_size && |
1354 | blocks < 16*1024*2) | |
1355 | blocks *= 2; | |
eba71529 | 1356 | } else |
7236ee7a N |
1357 | fprintf(stderr, Name ": Need to backup %luK of critical " |
1358 | "section..\n", blocks/2); | |
e86c9dd6 | 1359 | |
7236ee7a | 1360 | if (blocks >= sra->component_size/2) { |
e86c9dd6 NB |
1361 | fprintf(stderr, Name ": %s: Something wrong - reshape aborted\n", |
1362 | devname); | |
7236ee7a N |
1363 | rv = 1; |
1364 | break; | |
353632d9 | 1365 | } |
925211e3 | 1366 | nrdisks = array.raid_disks + sra->array.spare_disks; |
e86c9dd6 NB |
1367 | /* Now we need to open all these devices so we can read/write. |
1368 | */ | |
06b0d786 NB |
1369 | fdlist = malloc((1+nrdisks) * sizeof(int)); |
1370 | offsets = malloc((1+nrdisks) * sizeof(offsets[0])); | |
e86c9dd6 NB |
1371 | if (!fdlist || !offsets) { |
1372 | fprintf(stderr, Name ": malloc failed: grow aborted\n"); | |
7236ee7a N |
1373 | rv = 1; |
1374 | break; | |
e86c9dd6 | 1375 | } |
06b0d786 | 1376 | for (d=0; d <= nrdisks; d++) |
e86c9dd6 NB |
1377 | fdlist[d] = -1; |
1378 | d = array.raid_disks; | |
1379 | for (sd = sra->devs; sd; sd=sd->next) { | |
06c7f68e | 1380 | if (sd->disk.state & (1<<MD_DISK_FAULTY)) |
e86c9dd6 | 1381 | continue; |
06c7f68e NB |
1382 | if (sd->disk.state & (1<<MD_DISK_SYNC)) { |
1383 | char *dn = map_dev(sd->disk.major, | |
1384 | sd->disk.minor, 1); | |
1385 | fdlist[sd->disk.raid_disk] | |
1386 | = dev_open(dn, O_RDONLY); | |
7236ee7a | 1387 | offsets[sd->disk.raid_disk] = sd->data_offset*512; |
06c7f68e | 1388 | if (fdlist[sd->disk.raid_disk] < 0) { |
e86c9dd6 | 1389 | fprintf(stderr, Name ": %s: cannot open component %s\n", |
e81cdd9f | 1390 | devname, dn?dn:"-unknown-"); |
7236ee7a N |
1391 | rv = 1; |
1392 | goto release; | |
e86c9dd6 | 1393 | } |
7236ee7a | 1394 | } else if (backup_file == NULL) { |
e86c9dd6 | 1395 | /* spare */ |
06c7f68e NB |
1396 | char *dn = map_dev(sd->disk.major, |
1397 | sd->disk.minor, 1); | |
16c6fa80 | 1398 | fdlist[d] = dev_open(dn, O_RDWR); |
ff94fb86 | 1399 | offsets[d] = (sd->data_offset + sra->component_size - blocks - 8)*512; |
e86c9dd6 NB |
1400 | if (fdlist[d]<0) { |
1401 | fprintf(stderr, Name ": %s: cannot open component %s\n", | |
e81cdd9f | 1402 | devname, dn?dn:"-unknown"); |
7236ee7a N |
1403 | rv = 1; |
1404 | goto release; | |
e86c9dd6 NB |
1405 | } |
1406 | d++; | |
1407 | } | |
1408 | } | |
7236ee7a | 1409 | if (backup_file == NULL) { |
7bc71196 DW |
1410 | if (st->ss->external && !st->ss->manage_reshape) { |
1411 | fprintf(stderr, Name ": %s Grow operation not supported by %s metadata\n", | |
1412 | devname, st->ss->name); | |
1413 | rv = 1; | |
1414 | break; | |
1415 | } | |
7236ee7a N |
1416 | if (ndata <= odata) { |
1417 | fprintf(stderr, Name ": %s: Cannot grow - need backup-file\n", | |
1418 | devname); | |
1419 | rv = 1; | |
1420 | break; | |
1421 | } else if (sra->array.spare_disks == 0) { | |
1422 | fprintf(stderr, Name ": %s: Cannot grow - need a spare or " | |
1423 | "backup-file to backup critical section\n", | |
1424 | devname); | |
1425 | rv = 1; | |
1426 | break; | |
1427 | } | |
1428 | if (d == array.raid_disks) { | |
1429 | fprintf(stderr, Name ": %s: No spare device for backup\n", | |
1430 | devname); | |
1431 | rv = 1; | |
1432 | break; | |
e86c9dd6 | 1433 | } |
7236ee7a N |
1434 | } else { |
1435 | /* need to check backup file is large enough */ | |
1436 | char buf[512]; | |
1437 | fdlist[d] = open(backup_file, O_RDWR|O_CREAT|O_EXCL, | |
1438 | S_IRUSR | S_IWUSR); | |
1439 | offsets[d] = 8 * 512; | |
06b0d786 NB |
1440 | if (fdlist[d] < 0) { |
1441 | fprintf(stderr, Name ": %s: cannot create backup file %s: %s\n", | |
1442 | devname, backup_file, strerror(errno)); | |
7236ee7a N |
1443 | rv = 1; |
1444 | break; | |
1445 | } | |
1446 | memset(buf, 0, 512); | |
f21e18ca | 1447 | for (i=0; i < (signed)blocks + 1 ; i++) { |
7236ee7a N |
1448 | if (write(fdlist[d], buf, 512) != 512) { |
1449 | fprintf(stderr, Name ": %s: cannot create backup file %s: %s\n", | |
1450 | devname, backup_file, strerror(errno)); | |
1451 | rv = 1; | |
1452 | break; | |
1453 | } | |
1454 | } | |
1455 | if (fsync(fdlist[d]) != 0) { | |
1456 | fprintf(stderr, Name ": %s: cannot create backup file %s: %s\n", | |
1457 | devname, backup_file, strerror(errno)); | |
1458 | rv = 1; | |
1459 | break; | |
06b0d786 | 1460 | } |
06b0d786 | 1461 | d++; |
06b0d786 | 1462 | } |
7236ee7a | 1463 | |
7bc71196 DW |
1464 | /* check that the operation is supported by the metadata */ |
1465 | if (reshape_super(st, -1, level, nlayout, nchunk, ndisks, | |
1466 | backup_file, devname, !quiet)) { | |
1467 | rv = 1; | |
1468 | break; | |
1469 | } | |
1470 | ||
7236ee7a N |
1471 | /* lastly, check that the internal stripe cache is |
1472 | * large enough, or it won't work. | |
1473 | */ | |
1474 | ||
1475 | cache = (nchunk < ochunk) ? ochunk : nchunk; | |
1476 | cache = cache * 4 / 4096; | |
1b13faf7 N |
1477 | if (cache < blocks / 8 / odisks + 16) |
1478 | /* Make it big enough to hold 'blocks' */ | |
1479 | cache = blocks / 8 / odisks + 16; | |
7236ee7a N |
1480 | if (sra->cache_size < cache) |
1481 | sysfs_set_num(sra, NULL, "stripe_cache_size", | |
1482 | cache+1); | |
1483 | /* Right, everything seems fine. Let's kick things off. | |
1484 | * If only changing raid_disks, use ioctl, else use | |
1485 | * sysfs. | |
1486 | */ | |
7bc71196 | 1487 | sync_metadata(st); |
7236ee7a N |
1488 | if (ochunk == nchunk && olayout == nlayout) { |
1489 | array.raid_disks = ndisks; | |
1490 | if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) { | |
39bbb392 | 1491 | int err = errno; |
7236ee7a N |
1492 | rv = 1; |
1493 | fprintf(stderr, Name ": Cannot set device shape for %s: %s\n", | |
1494 | devname, strerror(errno)); | |
1495 | if (ndisks < odisks && | |
1496 | get_linux_version() < 2006030) | |
1497 | fprintf(stderr, Name ": linux 2.6.30 or later required\n"); | |
39bbb392 N |
1498 | if (err == EBUSY && |
1499 | (array.state & (1<<MD_SB_BITMAP_PRESENT))) | |
1500 | fprintf(stderr, " Bitmap must be removed before shape can be changed\n"); | |
7236ee7a N |
1501 | |
1502 | break; | |
1503 | } | |
1504 | } else { | |
1505 | /* set them all just in case some old 'new_*' value | |
1506 | * persists from some earlier problem | |
1507 | */ | |
53f50353 N |
1508 | int err = err; /* only used if rv==1, and always set if |
1509 | * rv==1, so initialisation not needed, | |
1510 | * despite gcc warning | |
1511 | */ | |
7236ee7a | 1512 | if (sysfs_set_num(sra, NULL, "chunk_size", nchunk) < 0) |
39bbb392 N |
1513 | rv = 1, err = errno; |
1514 | if (!rv && sysfs_set_num(sra, NULL, "layout", nlayout) < 0) | |
1515 | rv = 1, err = errno; | |
1516 | if (!rv && sysfs_set_num(sra, NULL, "raid_disks", ndisks) < 0) | |
1517 | rv = 1, err = errno; | |
7236ee7a N |
1518 | if (rv) { |
1519 | fprintf(stderr, Name ": Cannot set device shape for %s\n", | |
1520 | devname); | |
1521 | if (get_linux_version() < 2006030) | |
1522 | fprintf(stderr, Name ": linux 2.6.30 or later required\n"); | |
39bbb392 N |
1523 | if (err == EBUSY && |
1524 | (array.state & (1<<MD_SB_BITMAP_PRESENT))) | |
1525 | fprintf(stderr, " Bitmap must be removed before shape can be changed\n"); | |
7236ee7a N |
1526 | break; |
1527 | } | |
e86c9dd6 NB |
1528 | } |
1529 | ||
7236ee7a N |
1530 | if (ndisks == 2 && odisks == 2) { |
1531 | /* No reshape is needed in this trivial case */ | |
1532 | rv = 0; | |
1533 | break; | |
1534 | } | |
1535 | ||
7bc71196 DW |
1536 | if (st->ss->external) { |
1537 | /* metadata handler takes it from here */ | |
1538 | ping_manager(container); | |
1539 | st->ss->manage_reshape(st, backup_file); | |
1540 | frozen = 0; | |
1541 | break; | |
1542 | } | |
1543 | ||
7236ee7a N |
1544 | /* set up the backup-super-block. This requires the |
1545 | * uuid from the array. | |
1546 | */ | |
e86c9dd6 | 1547 | /* Find a superblock */ |
7236ee7a N |
1548 | for (sd = sra->devs; sd; sd = sd->next) { |
1549 | char *dn; | |
1550 | int devfd; | |
1551 | int ok; | |
1552 | if (sd->disk.state & (1<<MD_DISK_FAULTY)) | |
1553 | continue; | |
1554 | dn = map_dev(sd->disk.major, sd->disk.minor, 1); | |
1555 | devfd = dev_open(dn, O_RDONLY); | |
1556 | if (devfd < 0) | |
1557 | continue; | |
1558 | ok = st->ss->load_super(st, devfd, NULL); | |
1559 | close(devfd); | |
1560 | if (ok >= 0) | |
1561 | break; | |
1562 | } | |
1563 | if (!sd) { | |
e86c9dd6 NB |
1564 | fprintf(stderr, Name ": %s: Cannot find a superblock\n", |
1565 | devname); | |
7236ee7a N |
1566 | rv = 1; |
1567 | break; | |
e86c9dd6 NB |
1568 | } |
1569 | ||
7236ee7a | 1570 | memset(&bsb, 0, 512); |
2efedc7b | 1571 | memcpy(bsb.magic, "md_backup_data-1", 16); |
3da92f27 | 1572 | st->ss->uuid_from_super(st, (int*)&bsb.set_uuid); |
2efedc7b | 1573 | bsb.mtime = __cpu_to_le64(time(0)); |
7236ee7a N |
1574 | bsb.devstart2 = blocks; |
1575 | stripes = blocks / (ochunk/512) / odata; | |
1576 | /* Now we just need to kick off the reshape and watch, while | |
1577 | * handling backups of the data... | |
1578 | * This is all done by a forked background process. | |
2efedc7b | 1579 | */ |
7236ee7a N |
1580 | switch(fork()) { |
1581 | case 0: | |
1582 | close(fd); | |
1583 | if (check_env("MDADM_GROW_VERIFY")) | |
1584 | fd = open(devname, O_RDONLY | O_DIRECT); | |
1585 | else | |
1586 | fd = -1; | |
1587 | mlockall(MCL_FUTURE); | |
1588 | ||
1589 | if (odata < ndata) | |
1590 | done = child_grow(fd, sra, stripes, | |
1591 | fdlist, offsets, | |
1592 | odisks, ochunk, array.level, olayout, odata, | |
1593 | d - odisks, fdlist+odisks, offsets+odisks); | |
1594 | else if (odata > ndata) | |
1595 | done = child_shrink(fd, sra, stripes, | |
1596 | fdlist, offsets, | |
1597 | odisks, ochunk, array.level, olayout, odata, | |
1598 | d - odisks, fdlist+odisks, offsets+odisks); | |
1599 | else | |
1600 | done = child_same_size(fd, sra, stripes, | |
1601 | fdlist, offsets, | |
e9e43ec3 | 1602 | 0, |
7236ee7a N |
1603 | odisks, ochunk, array.level, olayout, odata, |
1604 | d - odisks, fdlist+odisks, offsets+odisks); | |
1605 | if (backup_file && done) | |
1606 | unlink(backup_file); | |
1607 | if (level != UnSet && level != array.level) { | |
1608 | /* We need to wait for the reshape to finish | |
1609 | * (which will have happened unless odata < ndata) | |
1610 | * and then set the level | |
758d3a8e | 1611 | */ |
7236ee7a N |
1612 | |
1613 | c = map_num(pers, level); | |
1614 | if (c == NULL) | |
1615 | exit(0);/* not possible */ | |
1616 | ||
1617 | if (odata < ndata) | |
1618 | wait_reshape(sra); | |
1619 | err = sysfs_set_str(sra, NULL, "level", c); | |
1620 | if (err) | |
1621 | fprintf(stderr, Name ": %s: could not set level to %s\n", | |
1622 | devname, c); | |
758d3a8e | 1623 | } |
7236ee7a N |
1624 | exit(0); |
1625 | case -1: | |
1626 | fprintf(stderr, Name ": Cannot run child to monitor reshape: %s\n", | |
1627 | strerror(errno)); | |
1628 | rv = 1; | |
1629 | break; | |
1630 | default: | |
1631 | /* The child will take care of unfreezing the array */ | |
1632 | frozen = 0; | |
1633 | break; | |
e86c9dd6 | 1634 | } |
7236ee7a | 1635 | break; |
e86c9dd6 | 1636 | |
7236ee7a | 1637 | } |
e86c9dd6 | 1638 | |
7236ee7a N |
1639 | release: |
1640 | if (rv && orig_level != UnSet && sra) { | |
1641 | c = map_num(pers, orig_level); | |
1642 | if (c && sysfs_set_str(sra, NULL, "level", c) == 0) | |
1643 | fprintf(stderr, Name ": aborting level change\n"); | |
1644 | } | |
1645 | if (sra) | |
1646 | unfreeze_array(sra, frozen); | |
1647 | return rv; | |
1648 | } | |
e86c9dd6 | 1649 | |
7236ee7a N |
1650 | /* |
1651 | * We run a child process in the background which performs the following | |
1652 | * steps: | |
1653 | * - wait for resync to reach a certain point | |
1654 | * - suspend io to the following section | |
1655 | * - backup that section | |
1656 | * - allow resync to proceed further | |
1657 | * - resume io | |
1658 | * - discard the backup. | |
1659 | * | |
1660 | * When are combined in slightly different ways in the three cases. | |
1661 | * Grow: | |
1662 | * - suspend/backup/allow/wait/resume/discard | |
1663 | * Shrink: | |
1664 | * - allow/wait/suspend/backup/allow/wait/resume/discard | |
1665 | * same-size: | |
1666 | * - wait/resume/discard/suspend/backup/allow | |
1667 | * | |
1668 | * suspend/backup/allow always come together | |
1669 | * wait/resume/discard do too. | |
1670 | * For the same-size case we have two backups to improve flow. | |
1671 | * | |
1672 | */ | |
e86c9dd6 | 1673 | |
fcf57625 | 1674 | /* FIXME return status is never checked */ |
4411fb17 | 1675 | static int grow_backup(struct mdinfo *sra, |
7236ee7a N |
1676 | unsigned long long offset, /* per device */ |
1677 | unsigned long stripes, /* per device */ | |
1678 | int *sources, unsigned long long *offsets, | |
1679 | int disks, int chunk, int level, int layout, | |
1680 | int dests, int *destfd, unsigned long long *destoffsets, | |
d4445387 | 1681 | int part, int *degraded, |
7236ee7a N |
1682 | char *buf) |
1683 | { | |
1684 | /* Backup 'blocks' sectors at 'offset' on each device of the array, | |
1685 | * to storage 'destfd' (offset 'destoffsets'), after first | |
1686 | * suspending IO. Then allow resync to continue | |
1687 | * over the suspended section. | |
1688 | * Use part 'part' of the backup-super-block. | |
1689 | */ | |
1690 | int odata = disks; | |
1691 | int rv = 0; | |
1692 | int i; | |
f21e18ca N |
1693 | unsigned long long ll; |
1694 | int new_degraded; | |
7236ee7a N |
1695 | //printf("offset %llu\n", offset); |
1696 | if (level >= 4) | |
1697 | odata--; | |
1698 | if (level == 6) | |
1699 | odata--; | |
200871ad | 1700 | sysfs_set_num(sra, NULL, "suspend_hi", (offset + stripes * (chunk/512)) * odata); |
d4445387 | 1701 | /* Check that array hasn't become degraded, else we might backup the wrong data */ |
f21e18ca N |
1702 | sysfs_get_ll(sra, NULL, "degraded", &ll); |
1703 | new_degraded = (int)ll; | |
d4445387 N |
1704 | if (new_degraded != *degraded) { |
1705 | /* check each device to ensure it is still working */ | |
1706 | struct mdinfo *sd; | |
1707 | for (sd = sra->devs ; sd ; sd = sd->next) { | |
1708 | if (sd->disk.state & (1<<MD_DISK_FAULTY)) | |
1709 | continue; | |
1710 | if (sd->disk.state & (1<<MD_DISK_SYNC)) { | |
1711 | char sbuf[20]; | |
1712 | if (sysfs_get_str(sra, sd, "state", sbuf, 20) < 0 || | |
1713 | strstr(sbuf, "faulty") || | |
1714 | strstr(sbuf, "in_sync") == NULL) { | |
1715 | /* this device is dead */ | |
1716 | sd->disk.state = (1<<MD_DISK_FAULTY); | |
1717 | if (sd->disk.raid_disk >= 0 && | |
1718 | sources[sd->disk.raid_disk] >= 0) { | |
1719 | close(sources[sd->disk.raid_disk]); | |
1720 | sources[sd->disk.raid_disk] = -1; | |
1721 | } | |
1722 | } | |
1723 | } | |
1724 | } | |
1725 | *degraded = new_degraded; | |
1726 | } | |
7236ee7a N |
1727 | if (part) { |
1728 | bsb.arraystart2 = __cpu_to_le64(offset * odata); | |
200871ad | 1729 | bsb.length2 = __cpu_to_le64(stripes * (chunk/512) * odata); |
7236ee7a N |
1730 | } else { |
1731 | bsb.arraystart = __cpu_to_le64(offset * odata); | |
200871ad | 1732 | bsb.length = __cpu_to_le64(stripes * (chunk/512) * odata); |
7236ee7a N |
1733 | } |
1734 | if (part) | |
1735 | bsb.magic[15] = '2'; | |
1736 | for (i = 0; i < dests; i++) | |
1737 | if (part) | |
1738 | lseek64(destfd[i], destoffsets[i] + __le64_to_cpu(bsb.devstart2)*512, 0); | |
1739 | else | |
1740 | lseek64(destfd[i], destoffsets[i], 0); | |
1741 | ||
1742 | rv = save_stripes(sources, offsets, | |
1743 | disks, chunk, level, layout, | |
1744 | dests, destfd, | |
1745 | offset*512*odata, stripes * chunk * odata, | |
1746 | buf); | |
1747 | ||
1748 | if (rv) | |
1749 | return rv; | |
97396422 | 1750 | bsb.mtime = __cpu_to_le64(time(0)); |
7236ee7a N |
1751 | for (i = 0; i < dests; i++) { |
1752 | bsb.devstart = __cpu_to_le64(destoffsets[i]/512); | |
1753 | ||
1754 | bsb.sb_csum = bsb_csum((char*)&bsb, ((char*)&bsb.sb_csum)-((char*)&bsb)); | |
1755 | if (memcmp(bsb.magic, "md_backup_data-2", 16) == 0) | |
1756 | bsb.sb_csum2 = bsb_csum((char*)&bsb, | |
1757 | ((char*)&bsb.sb_csum2)-((char*)&bsb)); | |
1758 | ||
72044953 | 1759 | rv = -1; |
f21e18ca N |
1760 | if ((unsigned long long)lseek64(destfd[i], destoffsets[i] - 4096, 0) |
1761 | != destoffsets[i] - 4096) | |
72044953 N |
1762 | break; |
1763 | if (write(destfd[i], &bsb, 512) != 512) | |
1764 | break; | |
ff94fb86 | 1765 | if (destoffsets[i] > 4096) { |
f21e18ca | 1766 | if ((unsigned long long)lseek64(destfd[i], destoffsets[i]+stripes*chunk*odata, 0) != |
a847575a | 1767 | destoffsets[i]+stripes*chunk*odata) |
72044953 N |
1768 | break; |
1769 | if (write(destfd[i], &bsb, 512) != 512) | |
1770 | break; | |
ff94fb86 | 1771 | } |
7236ee7a | 1772 | fsync(destfd[i]); |
72044953 | 1773 | rv = 0; |
7236ee7a | 1774 | } |
2efedc7b | 1775 | |
fcf57625 | 1776 | return rv; |
7236ee7a N |
1777 | } |
1778 | ||
1779 | /* in 2.6.30, the value reported by sync_completed can be | |
1780 | * less that it should be by one stripe. | |
1781 | * This only happens when reshape hits sync_max and pauses. | |
1782 | * So allow wait_backup to either extent sync_max further | |
1783 | * than strictly necessary, or return before the | |
1784 | * sync has got quite as far as we would really like. | |
1785 | * This is what 'blocks2' is for. | |
1786 | * The various caller give appropriate values so that | |
1787 | * every works. | |
1788 | */ | |
fcf57625 | 1789 | /* FIXME return value is often ignored */ |
4411fb17 | 1790 | static int wait_backup(struct mdinfo *sra, |
7236ee7a N |
1791 | unsigned long long offset, /* per device */ |
1792 | unsigned long long blocks, /* per device */ | |
1793 | unsigned long long blocks2, /* per device - hack */ | |
1794 | int dests, int *destfd, unsigned long long *destoffsets, | |
1795 | int part) | |
1796 | { | |
1797 | /* Wait for resync to pass the section that was backed up | |
1798 | * then erase the backup and allow IO | |
1799 | */ | |
1800 | int fd = sysfs_get_fd(sra, NULL, "sync_completed"); | |
1801 | unsigned long long completed; | |
1802 | int i; | |
fcf57625 | 1803 | int rv; |
7236ee7a N |
1804 | |
1805 | if (fd < 0) | |
1806 | return -1; | |
1807 | sysfs_set_num(sra, NULL, "sync_max", offset + blocks + blocks2); | |
1808 | if (offset == 0) | |
1809 | sysfs_set_str(sra, NULL, "sync_action", "reshape"); | |
1810 | do { | |
1811 | char action[20]; | |
1812 | fd_set rfds; | |
1813 | FD_ZERO(&rfds); | |
1814 | FD_SET(fd, &rfds); | |
1815 | select(fd+1, NULL, NULL, &rfds, NULL); | |
1816 | if (sysfs_fd_get_ll(fd, &completed) < 0) { | |
1817 | close(fd); | |
1818 | return -1; | |
e86c9dd6 | 1819 | } |
7236ee7a N |
1820 | if (sysfs_get_str(sra, NULL, "sync_action", |
1821 | action, 20) > 0 && | |
1822 | strncmp(action, "reshape", 7) != 0) | |
1823 | break; | |
1824 | } while (completed < offset + blocks); | |
1825 | close(fd); | |
1826 | ||
1827 | if (part) { | |
1828 | bsb.arraystart2 = __cpu_to_le64(0); | |
1829 | bsb.length2 = __cpu_to_le64(0); | |
1830 | } else { | |
1831 | bsb.arraystart = __cpu_to_le64(0); | |
1832 | bsb.length = __cpu_to_le64(0); | |
1833 | } | |
97396422 | 1834 | bsb.mtime = __cpu_to_le64(time(0)); |
fcf57625 | 1835 | rv = 0; |
7236ee7a N |
1836 | for (i = 0; i < dests; i++) { |
1837 | bsb.devstart = __cpu_to_le64(destoffsets[i]/512); | |
1838 | bsb.sb_csum = bsb_csum((char*)&bsb, ((char*)&bsb.sb_csum)-((char*)&bsb)); | |
1839 | if (memcmp(bsb.magic, "md_backup_data-2", 16) == 0) | |
1840 | bsb.sb_csum2 = bsb_csum((char*)&bsb, | |
1841 | ((char*)&bsb.sb_csum2)-((char*)&bsb)); | |
f21e18ca | 1842 | if ((unsigned long long)lseek64(destfd[i], destoffsets[i]-4096, 0) != |
a847575a | 1843 | destoffsets[i]-4096) |
72044953 N |
1844 | rv = -1; |
1845 | if (rv == 0 && | |
1846 | write(destfd[i], &bsb, 512) != 512) | |
1847 | rv = -1; | |
7236ee7a N |
1848 | fsync(destfd[i]); |
1849 | } | |
fcf57625 | 1850 | return rv; |
7236ee7a | 1851 | } |
e86c9dd6 | 1852 | |
7236ee7a N |
1853 | static void fail(char *msg) |
1854 | { | |
fcf57625 | 1855 | int rv; |
72044953 N |
1856 | rv = (write(2, msg, strlen(msg)) != (int)strlen(msg)); |
1857 | rv |= (write(2, "\n", 1) != 1); | |
fcf57625 | 1858 | exit(rv ? 1 : 2); |
7236ee7a N |
1859 | } |
1860 | ||
1861 | static char *abuf, *bbuf; | |
f21e18ca | 1862 | static unsigned long long abuflen; |
7236ee7a N |
1863 | static void validate(int afd, int bfd, unsigned long long offset) |
1864 | { | |
1865 | /* check that the data in the backup against the array. | |
1866 | * This is only used for regression testing and should not | |
1867 | * be used while the array is active | |
1868 | */ | |
7236ee7a N |
1869 | if (afd < 0) |
1870 | return; | |
1871 | lseek64(bfd, offset - 4096, 0); | |
1872 | if (read(bfd, &bsb2, 512) != 512) | |
1873 | fail("cannot read bsb"); | |
1874 | if (bsb2.sb_csum != bsb_csum((char*)&bsb2, | |
1875 | ((char*)&bsb2.sb_csum)-((char*)&bsb2))) | |
1876 | fail("first csum bad"); | |
1877 | if (memcmp(bsb2.magic, "md_backup_data", 14) != 0) | |
1878 | fail("magic is bad"); | |
1879 | if (memcmp(bsb2.magic, "md_backup_data-2", 16) == 0 && | |
1880 | bsb2.sb_csum2 != bsb_csum((char*)&bsb2, | |
1881 | ((char*)&bsb2.sb_csum2)-((char*)&bsb2))) | |
1882 | fail("second csum bad"); | |
1883 | ||
1884 | if (__le64_to_cpu(bsb2.devstart)*512 != offset) | |
1885 | fail("devstart is wrong"); | |
1886 | ||
1887 | if (bsb2.length) { | |
1888 | unsigned long long len = __le64_to_cpu(bsb2.length)*512; | |
1889 | ||
1890 | if (abuflen < len) { | |
1891 | free(abuf); | |
1892 | free(bbuf); | |
1893 | abuflen = len; | |
fcf57625 N |
1894 | if (posix_memalign((void**)&abuf, 4096, abuflen) || |
1895 | posix_memalign((void**)&bbuf, 4096, abuflen)) { | |
1896 | abuflen = 0; | |
1897 | /* just stop validating on mem-alloc failure */ | |
1898 | return; | |
1899 | } | |
e86c9dd6 | 1900 | } |
48924014 | 1901 | |
7236ee7a | 1902 | lseek64(bfd, offset, 0); |
f21e18ca | 1903 | if ((unsigned long long)read(bfd, bbuf, len) != len) { |
080fd005 | 1904 | //printf("len %llu\n", len); |
7236ee7a N |
1905 | fail("read first backup failed"); |
1906 | } | |
1907 | lseek64(afd, __le64_to_cpu(bsb2.arraystart)*512, 0); | |
f21e18ca | 1908 | if ((unsigned long long)read(afd, abuf, len) != len) |
7236ee7a N |
1909 | fail("read first from array failed"); |
1910 | if (memcmp(bbuf, abuf, len) != 0) { | |
080fd005 | 1911 | #if 0 |
7236ee7a N |
1912 | int i; |
1913 | printf("offset=%llu len=%llu\n", | |
080fd005 | 1914 | (unsigned long long)__le64_to_cpu(bsb2.arraystart)*512, len); |
7236ee7a N |
1915 | for (i=0; i<len; i++) |
1916 | if (bbuf[i] != abuf[i]) { | |
1917 | printf("first diff byte %d\n", i); | |
93ecfa01 | 1918 | break; |
7236ee7a | 1919 | } |
080fd005 | 1920 | #endif |
7236ee7a | 1921 | fail("data1 compare failed"); |
e86c9dd6 | 1922 | } |
7236ee7a N |
1923 | } |
1924 | if (bsb2.length2) { | |
1925 | unsigned long long len = __le64_to_cpu(bsb2.length2)*512; | |
1926 | ||
1927 | if (abuflen < len) { | |
1928 | free(abuf); | |
1929 | free(bbuf); | |
1930 | abuflen = len; | |
1931 | abuf = malloc(abuflen); | |
1932 | bbuf = malloc(abuflen); | |
e86c9dd6 NB |
1933 | } |
1934 | ||
7236ee7a | 1935 | lseek64(bfd, offset+__le64_to_cpu(bsb2.devstart2)*512, 0); |
f21e18ca | 1936 | if ((unsigned long long)read(bfd, bbuf, len) != len) |
7236ee7a N |
1937 | fail("read second backup failed"); |
1938 | lseek64(afd, __le64_to_cpu(bsb2.arraystart2)*512, 0); | |
f21e18ca | 1939 | if ((unsigned long long)read(afd, abuf, len) != len) |
7236ee7a N |
1940 | fail("read second from array failed"); |
1941 | if (memcmp(bbuf, abuf, len) != 0) | |
1942 | fail("data2 compare failed"); | |
e86c9dd6 | 1943 | } |
7236ee7a | 1944 | } |
e86c9dd6 | 1945 | |
7236ee7a N |
1946 | static int child_grow(int afd, struct mdinfo *sra, unsigned long stripes, |
1947 | int *fds, unsigned long long *offsets, | |
1948 | int disks, int chunk, int level, int layout, int data, | |
1949 | int dests, int *destfd, unsigned long long *destoffsets) | |
1950 | { | |
1951 | char *buf; | |
d4445387 | 1952 | int degraded = 0; |
e86c9dd6 | 1953 | |
fcf57625 N |
1954 | if (posix_memalign((void**)&buf, 4096, disks * chunk)) |
1955 | /* Don't start the 'reshape' */ | |
1956 | return 0; | |
7236ee7a N |
1957 | sysfs_set_num(sra, NULL, "suspend_hi", 0); |
1958 | sysfs_set_num(sra, NULL, "suspend_lo", 0); | |
1959 | grow_backup(sra, 0, stripes, | |
1960 | fds, offsets, disks, chunk, level, layout, | |
1961 | dests, destfd, destoffsets, | |
d4445387 | 1962 | 0, °raded, buf); |
7236ee7a | 1963 | validate(afd, destfd[0], destoffsets[0]); |
200871ad | 1964 | wait_backup(sra, 0, stripes * (chunk / 512), stripes * (chunk / 512), |
725cac4c N |
1965 | dests, destfd, destoffsets, |
1966 | 0); | |
200871ad | 1967 | sysfs_set_num(sra, NULL, "suspend_lo", (stripes * (chunk/512)) * data); |
7236ee7a N |
1968 | free(buf); |
1969 | /* FIXME this should probably be numeric */ | |
1970 | sysfs_set_str(sra, NULL, "sync_max", "max"); | |
e86c9dd6 | 1971 | return 1; |
7236ee7a | 1972 | } |
e86c9dd6 | 1973 | |
7236ee7a N |
1974 | static int child_shrink(int afd, struct mdinfo *sra, unsigned long stripes, |
1975 | int *fds, unsigned long long *offsets, | |
1976 | int disks, int chunk, int level, int layout, int data, | |
1977 | int dests, int *destfd, unsigned long long *destoffsets) | |
1978 | { | |
1979 | char *buf; | |
1980 | unsigned long long start; | |
1981 | int rv; | |
d4445387 | 1982 | int degraded = 0; |
7236ee7a | 1983 | |
fcf57625 N |
1984 | if (posix_memalign((void**)&buf, 4096, disks * chunk)) |
1985 | return 0; | |
200871ad | 1986 | start = sra->component_size - stripes * (chunk/512); |
7236ee7a N |
1987 | sysfs_set_num(sra, NULL, "sync_max", start); |
1988 | sysfs_set_str(sra, NULL, "sync_action", "reshape"); | |
1989 | sysfs_set_num(sra, NULL, "suspend_lo", 0); | |
1990 | sysfs_set_num(sra, NULL, "suspend_hi", 0); | |
200871ad | 1991 | rv = wait_backup(sra, 0, start - stripes * (chunk/512), stripes * (chunk/512), |
7236ee7a N |
1992 | dests, destfd, destoffsets, 0); |
1993 | if (rv < 0) | |
1994 | return 0; | |
1995 | grow_backup(sra, 0, stripes, | |
1996 | fds, offsets, | |
1997 | disks, chunk, level, layout, | |
1998 | dests, destfd, destoffsets, | |
d4445387 | 1999 | 0, °raded, buf); |
7236ee7a | 2000 | validate(afd, destfd[0], destoffsets[0]); |
200871ad | 2001 | wait_backup(sra, start, stripes*(chunk/512), 0, |
725cac4c | 2002 | dests, destfd, destoffsets, 0); |
200871ad | 2003 | sysfs_set_num(sra, NULL, "suspend_lo", (stripes * (chunk/512)) * data); |
7236ee7a N |
2004 | free(buf); |
2005 | /* FIXME this should probably be numeric */ | |
2006 | sysfs_set_str(sra, NULL, "sync_max", "max"); | |
2007 | return 1; | |
2008 | } | |
2009 | ||
2010 | static int child_same_size(int afd, struct mdinfo *sra, unsigned long stripes, | |
2011 | int *fds, unsigned long long *offsets, | |
e9e43ec3 | 2012 | unsigned long long start, |
7236ee7a N |
2013 | int disks, int chunk, int level, int layout, int data, |
2014 | int dests, int *destfd, unsigned long long *destoffsets) | |
2015 | { | |
e9e43ec3 | 2016 | unsigned long long size; |
7236ee7a N |
2017 | unsigned long tailstripes = stripes; |
2018 | int part; | |
2019 | char *buf; | |
2020 | unsigned long long speed; | |
d4445387 | 2021 | int degraded = 0; |
7236ee7a N |
2022 | |
2023 | ||
fcf57625 N |
2024 | if (posix_memalign((void**)&buf, 4096, disks * chunk)) |
2025 | return 0; | |
7236ee7a N |
2026 | |
2027 | sysfs_set_num(sra, NULL, "suspend_lo", 0); | |
2028 | sysfs_set_num(sra, NULL, "suspend_hi", 0); | |
2029 | ||
2030 | sysfs_get_ll(sra, NULL, "sync_speed_min", &speed); | |
2031 | sysfs_set_num(sra, NULL, "sync_speed_min", 200000); | |
2032 | ||
e9e43ec3 | 2033 | grow_backup(sra, start, stripes, |
7236ee7a N |
2034 | fds, offsets, |
2035 | disks, chunk, level, layout, | |
2036 | dests, destfd, destoffsets, | |
d4445387 | 2037 | 0, °raded, buf); |
200871ad | 2038 | grow_backup(sra, (start + stripes) * (chunk/512), stripes, |
7236ee7a N |
2039 | fds, offsets, |
2040 | disks, chunk, level, layout, | |
2041 | dests, destfd, destoffsets, | |
d4445387 | 2042 | 1, °raded, buf); |
7236ee7a N |
2043 | validate(afd, destfd[0], destoffsets[0]); |
2044 | part = 0; | |
e9e43ec3 | 2045 | start += stripes * 2; /* where to read next */ |
7236ee7a N |
2046 | size = sra->component_size / (chunk/512); |
2047 | while (start < size) { | |
200871ad N |
2048 | if (wait_backup(sra, (start-stripes*2)*(chunk/512), |
2049 | stripes*(chunk/512), 0, | |
7236ee7a N |
2050 | dests, destfd, destoffsets, |
2051 | part) < 0) | |
2052 | return 0; | |
200871ad | 2053 | sysfs_set_num(sra, NULL, "suspend_lo", start*(chunk/512) * data); |
7236ee7a N |
2054 | if (start + stripes > size) |
2055 | tailstripes = (size - start); | |
2056 | ||
200871ad | 2057 | grow_backup(sra, start*(chunk/512), tailstripes, |
7236ee7a N |
2058 | fds, offsets, |
2059 | disks, chunk, level, layout, | |
2060 | dests, destfd, destoffsets, | |
d4445387 | 2061 | part, °raded, buf); |
7236ee7a N |
2062 | start += stripes; |
2063 | part = 1 - part; | |
2064 | validate(afd, destfd[0], destoffsets[0]); | |
2065 | } | |
200871ad | 2066 | if (wait_backup(sra, (start-stripes*2) * (chunk/512), stripes * (chunk/512), 0, |
7236ee7a N |
2067 | dests, destfd, destoffsets, |
2068 | part) < 0) | |
2069 | return 0; | |
200871ad N |
2070 | sysfs_set_num(sra, NULL, "suspend_lo", ((start-stripes)*(chunk/512)) * data); |
2071 | wait_backup(sra, (start-stripes) * (chunk/512), tailstripes * (chunk/512), 0, | |
725cac4c N |
2072 | dests, destfd, destoffsets, |
2073 | 1-part); | |
200871ad | 2074 | sysfs_set_num(sra, NULL, "suspend_lo", (size*(chunk/512)) * data); |
7236ee7a N |
2075 | sysfs_set_num(sra, NULL, "sync_speed_min", speed); |
2076 | free(buf); | |
2077 | return 1; | |
e86c9dd6 | 2078 | } |
353632d9 NB |
2079 | |
2080 | /* | |
2081 | * If any spare contains md_back_data-1 which is recent wrt mtime, | |
2082 | * write that data into the array and update the super blocks with | |
2083 | * the new reshape_progress | |
2084 | */ | |
ea0ebe96 N |
2085 | int Grow_restart(struct supertype *st, struct mdinfo *info, int *fdlist, int cnt, |
2086 | char *backup_file, int verbose) | |
353632d9 NB |
2087 | { |
2088 | int i, j; | |
2089 | int old_disks; | |
353632d9 | 2090 | unsigned long long *offsets; |
82f2d6ab | 2091 | unsigned long long nstripe, ostripe; |
6e9eac4f | 2092 | int ndata, odata; |
353632d9 | 2093 | |
e9e43ec3 N |
2094 | if (info->new_level != info->array.level) |
2095 | return 1; /* Cannot handle level changes (they are instantaneous) */ | |
2096 | ||
2097 | odata = info->array.raid_disks - info->delta_disks - 1; | |
2098 | if (info->array.level == 6) odata--; /* number of data disks */ | |
2099 | ndata = info->array.raid_disks - 1; | |
2100 | if (info->new_level == 6) ndata--; | |
353632d9 NB |
2101 | |
2102 | old_disks = info->array.raid_disks - info->delta_disks; | |
2103 | ||
e9e43ec3 N |
2104 | if (info->delta_disks <= 0) |
2105 | /* Didn't grow, so the backup file must have | |
2106 | * been used | |
2107 | */ | |
2108 | old_disks = cnt; | |
06b0d786 | 2109 | for (i=old_disks-(backup_file?1:0); i<cnt; i++) { |
353632d9 | 2110 | struct mdinfo dinfo; |
06b0d786 | 2111 | int fd; |
e9e43ec3 | 2112 | int bsbsize; |
ea0ebe96 | 2113 | char *devname, namebuf[20]; |
353632d9 NB |
2114 | |
2115 | /* This was a spare and may have some saved data on it. | |
2116 | * Load the superblock, find and load the | |
2117 | * backup_super_block. | |
2118 | * If either fail, go on to next device. | |
2119 | * If the backup contains no new info, just return | |
206c5eae | 2120 | * else restore data and update all superblocks |
353632d9 | 2121 | */ |
06b0d786 NB |
2122 | if (i == old_disks-1) { |
2123 | fd = open(backup_file, O_RDONLY); | |
e9e43ec3 N |
2124 | if (fd<0) { |
2125 | fprintf(stderr, Name ": backup file %s inaccessible: %s\n", | |
2126 | backup_file, strerror(errno)); | |
06b0d786 | 2127 | continue; |
e9e43ec3 | 2128 | } |
ea0ebe96 | 2129 | devname = backup_file; |
06b0d786 NB |
2130 | } else { |
2131 | fd = fdlist[i]; | |
2132 | if (fd < 0) | |
2133 | continue; | |
3da92f27 | 2134 | if (st->ss->load_super(st, fd, NULL)) |
06b0d786 | 2135 | continue; |
353632d9 | 2136 | |
a5d85af7 | 2137 | st->ss->getinfo_super(st, &dinfo, NULL); |
3da92f27 NB |
2138 | st->ss->free_super(st); |
2139 | ||
06b0d786 NB |
2140 | if (lseek64(fd, |
2141 | (dinfo.data_offset + dinfo.component_size - 8) <<9, | |
ea0ebe96 N |
2142 | 0) < 0) { |
2143 | fprintf(stderr, Name ": Cannot seek on device %d\n", i); | |
06b0d786 | 2144 | continue; /* Cannot seek */ |
ea0ebe96 N |
2145 | } |
2146 | sprintf(namebuf, "device-%d", i); | |
2147 | devname = namebuf; | |
06b0d786 | 2148 | } |
ea0ebe96 N |
2149 | if (read(fd, &bsb, sizeof(bsb)) != sizeof(bsb)) { |
2150 | if (verbose) | |
2151 | fprintf(stderr, Name ": Cannot read from %s\n", devname); | |
353632d9 | 2152 | continue; /* Cannot read */ |
ea0ebe96 | 2153 | } |
e9e43ec3 | 2154 | if (memcmp(bsb.magic, "md_backup_data-1", 16) != 0 && |
ea0ebe96 N |
2155 | memcmp(bsb.magic, "md_backup_data-2", 16) != 0) { |
2156 | if (verbose) | |
2157 | fprintf(stderr, Name ": No backup metadata on %s\n", devname); | |
353632d9 | 2158 | continue; |
ea0ebe96 N |
2159 | } |
2160 | if (bsb.sb_csum != bsb_csum((char*)&bsb, ((char*)&bsb.sb_csum)-((char*)&bsb))) { | |
2161 | if (verbose) | |
2162 | fprintf(stderr, Name ": Bad backup-metadata checksum on %s\n", devname); | |
353632d9 | 2163 | continue; /* bad checksum */ |
ea0ebe96 | 2164 | } |
e9e43ec3 | 2165 | if (memcmp(bsb.magic, "md_backup_data-2", 16) == 0 && |
ea0ebe96 N |
2166 | bsb.sb_csum2 != bsb_csum((char*)&bsb, ((char*)&bsb.sb_csum2)-((char*)&bsb))) { |
2167 | if (verbose) | |
2168 | fprintf(stderr, Name ": Bad backup-metadata checksum2 on %s\n", devname); | |
22e30516 | 2169 | continue; /* Bad second checksum */ |
ea0ebe96 N |
2170 | } |
2171 | if (memcmp(bsb.set_uuid,info->uuid, 16) != 0) { | |
2172 | if (verbose) | |
2173 | fprintf(stderr, Name ": Wrong uuid on backup-metadata on %s\n", devname); | |
353632d9 | 2174 | continue; /* Wrong uuid */ |
ea0ebe96 | 2175 | } |
353632d9 | 2176 | |
097075b6 N |
2177 | /* array utime and backup-mtime should be updated at much the same time, but it seems that |
2178 | * sometimes they aren't... So allow considerable flexability in matching, and allow | |
2179 | * this test to be overridden by an environment variable. | |
2180 | */ | |
f21e18ca N |
2181 | if (info->array.utime > (int)__le64_to_cpu(bsb.mtime) + 2*60*60 || |
2182 | info->array.utime < (int)__le64_to_cpu(bsb.mtime) - 10*60) { | |
097075b6 N |
2183 | if (check_env("MDADM_GROW_ALLOW_OLD")) { |
2184 | fprintf(stderr, Name ": accepting backup with timestamp %lu " | |
2185 | "for array with timestamp %lu\n", | |
2186 | (unsigned long)__le64_to_cpu(bsb.mtime), | |
2187 | (unsigned long)info->array.utime); | |
2188 | } else { | |
2189 | if (verbose) | |
2190 | fprintf(stderr, Name ": too-old timestamp on " | |
2191 | "backup-metadata on %s\n", devname); | |
2192 | continue; /* time stamp is too bad */ | |
2193 | } | |
ea0ebe96 | 2194 | } |
353632d9 | 2195 | |
e9e43ec3 N |
2196 | if (bsb.magic[15] == '1') { |
2197 | if (info->delta_disks >= 0) { | |
2198 | /* reshape_progress is increasing */ | |
2199 | if (__le64_to_cpu(bsb.arraystart) + __le64_to_cpu(bsb.length) < | |
ea0ebe96 N |
2200 | info->reshape_progress) { |
2201 | nonew: | |
2202 | if (verbose) | |
2203 | fprintf(stderr, Name ": backup-metadata found on %s but is not needed\n", devname); | |
e9e43ec3 | 2204 | continue; /* No new data here */ |
ea0ebe96 | 2205 | } |
e9e43ec3 N |
2206 | } else { |
2207 | /* reshape_progress is decreasing */ | |
2208 | if (__le64_to_cpu(bsb.arraystart) >= | |
2209 | info->reshape_progress) | |
ea0ebe96 | 2210 | goto nonew; /* No new data here */ |
e9e43ec3 N |
2211 | } |
2212 | } else { | |
2213 | if (info->delta_disks >= 0) { | |
2214 | /* reshape_progress is increasing */ | |
2215 | if (__le64_to_cpu(bsb.arraystart) + __le64_to_cpu(bsb.length) < | |
2216 | info->reshape_progress && | |
2217 | __le64_to_cpu(bsb.arraystart2) + __le64_to_cpu(bsb.length2) < | |
2218 | info->reshape_progress) | |
ea0ebe96 | 2219 | goto nonew; /* No new data here */ |
e9e43ec3 N |
2220 | } else { |
2221 | /* reshape_progress is decreasing */ | |
2222 | if (__le64_to_cpu(bsb.arraystart) >= | |
2223 | info->reshape_progress && | |
2224 | __le64_to_cpu(bsb.arraystart2) >= | |
2225 | info->reshape_progress) | |
ea0ebe96 | 2226 | goto nonew; /* No new data here */ |
e9e43ec3 N |
2227 | } |
2228 | } | |
ea0ebe96 N |
2229 | if (lseek64(fd, __le64_to_cpu(bsb.devstart)*512, 0)< 0) { |
2230 | second_fail: | |
2231 | if (verbose) | |
2232 | fprintf(stderr, Name ": Failed to verify secondary backup-metadata block on %s\n", | |
2233 | devname); | |
353632d9 | 2234 | continue; /* Cannot seek */ |
ea0ebe96 | 2235 | } |
2efedc7b | 2236 | /* There should be a duplicate backup superblock 4k before here */ |
06b0d786 | 2237 | if (lseek64(fd, -4096, 1) < 0 || |
0155af90 | 2238 | read(fd, &bsb2, sizeof(bsb2)) != sizeof(bsb2)) |
ea0ebe96 | 2239 | goto second_fail; /* Cannot find leading superblock */ |
e9e43ec3 N |
2240 | if (bsb.magic[15] == '1') |
2241 | bsbsize = offsetof(struct mdp_backup_super, pad1); | |
2242 | else | |
2243 | bsbsize = offsetof(struct mdp_backup_super, pad); | |
ff94fb86 | 2244 | if (memcmp(&bsb2, &bsb, bsbsize) != 0) |
ea0ebe96 | 2245 | goto second_fail; /* Cannot find leading superblock */ |
2efedc7b | 2246 | |
353632d9 NB |
2247 | /* Now need the data offsets for all devices. */ |
2248 | offsets = malloc(sizeof(*offsets)*info->array.raid_disks); | |
2249 | for(j=0; j<info->array.raid_disks; j++) { | |
2250 | if (fdlist[j] < 0) | |
2251 | continue; | |
3da92f27 | 2252 | if (st->ss->load_super(st, fdlist[j], NULL)) |
353632d9 NB |
2253 | /* FIXME should be this be an error */ |
2254 | continue; | |
a5d85af7 | 2255 | st->ss->getinfo_super(st, &dinfo, NULL); |
3da92f27 | 2256 | st->ss->free_super(st); |
14e5b4d7 | 2257 | offsets[j] = dinfo.data_offset * 512; |
353632d9 NB |
2258 | } |
2259 | printf(Name ": restoring critical section\n"); | |
2260 | ||
2261 | if (restore_stripes(fdlist, offsets, | |
2262 | info->array.raid_disks, | |
2263 | info->new_chunk, | |
2264 | info->new_level, | |
2265 | info->new_layout, | |
06b0d786 | 2266 | fd, __le64_to_cpu(bsb.devstart)*512, |
92dcdf7c | 2267 | __le64_to_cpu(bsb.arraystart)*512, |
e9e43ec3 N |
2268 | __le64_to_cpu(bsb.length)*512)) { |
2269 | /* didn't succeed, so giveup */ | |
ea0ebe96 N |
2270 | if (verbose) |
2271 | fprintf(stderr, Name ": Error restoring backup from %s\n", | |
2272 | devname); | |
e9e43ec3 N |
2273 | return 1; |
2274 | } | |
2275 | ||
2276 | if (bsb.magic[15] == '2' && | |
2277 | restore_stripes(fdlist, offsets, | |
2278 | info->array.raid_disks, | |
2279 | info->new_chunk, | |
2280 | info->new_level, | |
2281 | info->new_layout, | |
2282 | fd, __le64_to_cpu(bsb.devstart)*512 + | |
2283 | __le64_to_cpu(bsb.devstart2)*512, | |
92dcdf7c | 2284 | __le64_to_cpu(bsb.arraystart2)*512, |
e9e43ec3 | 2285 | __le64_to_cpu(bsb.length2)*512)) { |
353632d9 | 2286 | /* didn't succeed, so giveup */ |
ea0ebe96 N |
2287 | if (verbose) |
2288 | fprintf(stderr, Name ": Error restoring second backup from %s\n", | |
2289 | devname); | |
2295250a | 2290 | return 1; |
353632d9 NB |
2291 | } |
2292 | ||
e9e43ec3 | 2293 | |
353632d9 NB |
2294 | /* Ok, so the data is restored. Let's update those superblocks. */ |
2295 | ||
e9e43ec3 N |
2296 | if (info->delta_disks >= 0) { |
2297 | info->reshape_progress = __le64_to_cpu(bsb.arraystart) + | |
2298 | __le64_to_cpu(bsb.length); | |
2299 | if (bsb.magic[15] == '2') { | |
2300 | unsigned long long p2 = __le64_to_cpu(bsb.arraystart2) + | |
2301 | __le64_to_cpu(bsb.length2); | |
2302 | if (p2 > info->reshape_progress) | |
2303 | info->reshape_progress = p2; | |
2304 | } | |
2305 | } else { | |
2306 | info->reshape_progress = __le64_to_cpu(bsb.arraystart); | |
2307 | if (bsb.magic[15] == '2') { | |
2308 | unsigned long long p2 = __le64_to_cpu(bsb.arraystart2); | |
2309 | if (p2 < info->reshape_progress) | |
2310 | info->reshape_progress = p2; | |
2311 | } | |
2312 | } | |
353632d9 NB |
2313 | for (j=0; j<info->array.raid_disks; j++) { |
2314 | if (fdlist[j] < 0) continue; | |
3da92f27 | 2315 | if (st->ss->load_super(st, fdlist[j], NULL)) |
353632d9 | 2316 | continue; |
a5d85af7 | 2317 | st->ss->getinfo_super(st, &dinfo, NULL); |
e9e43ec3 | 2318 | dinfo.reshape_progress = info->reshape_progress; |
3da92f27 | 2319 | st->ss->update_super(st, &dinfo, |
68c7d6d7 NB |
2320 | "_reshape_progress", |
2321 | NULL,0, 0, NULL); | |
3da92f27 NB |
2322 | st->ss->store_super(st, fdlist[j]); |
2323 | st->ss->free_super(st); | |
353632d9 | 2324 | } |
353632d9 NB |
2325 | return 0; |
2326 | } | |
6e9eac4f NB |
2327 | /* Didn't find any backup data, try to see if any |
2328 | * was needed. | |
2329 | */ | |
82f2d6ab N |
2330 | if (info->delta_disks < 0) { |
2331 | /* When shrinking, the critical section is at the end. | |
2332 | * So see if we are before the critical section. | |
2333 | */ | |
2334 | unsigned long long first_block; | |
2335 | nstripe = ostripe = 0; | |
2336 | first_block = 0; | |
2337 | while (ostripe >= nstripe) { | |
2338 | ostripe += info->array.chunk_size / 512; | |
2339 | first_block = ostripe * odata; | |
2340 | nstripe = first_block / ndata / (info->new_chunk/512) * | |
2341 | (info->new_chunk/512); | |
2342 | } | |
2343 | ||
2344 | if (info->reshape_progress >= first_block) | |
2345 | return 0; | |
6e9eac4f | 2346 | } |
82f2d6ab N |
2347 | if (info->delta_disks > 0) { |
2348 | /* See if we are beyond the critical section. */ | |
2349 | unsigned long long last_block; | |
2350 | nstripe = ostripe = 0; | |
2351 | last_block = 0; | |
2352 | while (nstripe >= ostripe) { | |
2353 | nstripe += info->new_chunk / 512; | |
2354 | last_block = nstripe * ndata; | |
2355 | ostripe = last_block / odata / (info->array.chunk_size/512) * | |
2356 | (info->array.chunk_size/512); | |
2357 | } | |
6e9eac4f | 2358 | |
82f2d6ab N |
2359 | if (info->reshape_progress >= last_block) |
2360 | return 0; | |
2361 | } | |
6e9eac4f | 2362 | /* needed to recover critical section! */ |
ea0ebe96 N |
2363 | if (verbose) |
2364 | fprintf(stderr, Name ": Failed to find backup of critical section\n"); | |
2295250a | 2365 | return 1; |
353632d9 | 2366 | } |
e9e43ec3 N |
2367 | |
2368 | int Grow_continue(int mdfd, struct supertype *st, struct mdinfo *info, | |
2369 | char *backup_file) | |
2370 | { | |
2371 | /* Array is assembled and ready to be started, but | |
2372 | * monitoring is probably required. | |
2373 | * So: | |
2374 | * - start read-only | |
2375 | * - set upper bound for resync | |
2376 | * - initialise the 'suspend' boundaries | |
2377 | * - switch to read-write | |
2378 | * - fork and continue monitoring | |
2379 | */ | |
2380 | int err; | |
2381 | int backup_list[1]; | |
2382 | unsigned long long backup_offsets[1]; | |
2383 | int odisks, ndisks, ochunk, nchunk,odata,ndata; | |
2384 | unsigned long a,b,blocks,stripes; | |
2385 | int backup_fd; | |
2386 | int *fds; | |
2387 | unsigned long long *offsets; | |
2388 | int d; | |
2389 | struct mdinfo *sra, *sd; | |
2390 | int rv; | |
f21e18ca | 2391 | unsigned long cache; |
e9e43ec3 N |
2392 | int done = 0; |
2393 | ||
2394 | err = sysfs_set_str(info, NULL, "array_state", "readonly"); | |
2395 | if (err) | |
2396 | return err; | |
2397 | ||
2398 | /* make sure reshape doesn't progress until we are ready */ | |
2399 | sysfs_set_str(info, NULL, "sync_max", "0"); | |
2400 | sysfs_set_str(info, NULL, "array_state", "active"); /* FIXME or clean */ | |
5f6ca90a N |
2401 | |
2402 | sra = sysfs_read(-1, devname2devnum(info->sys_name), | |
2403 | GET_COMPONENT|GET_DEVS|GET_OFFSET|GET_STATE| | |
2404 | GET_CACHE); | |
2405 | if (!sra) | |
2406 | return 1; | |
2407 | ||
e9e43ec3 N |
2408 | /* ndisks is not growing, so raid_disks is old and +delta is new */ |
2409 | odisks = info->array.raid_disks; | |
2410 | ndisks = odisks + info->delta_disks; | |
2411 | odata = odisks - 1; | |
2412 | ndata = ndisks - 1; | |
2413 | if (info->array.level == 6) { | |
2414 | odata--; | |
2415 | ndata--; | |
2416 | } | |
2417 | ochunk = info->array.chunk_size; | |
2418 | nchunk = info->new_chunk; | |
2419 | ||
200871ad N |
2420 | a = (ochunk/512) * odata; |
2421 | b = (nchunk/512) * ndata; | |
e9e43ec3 N |
2422 | /* Find GCD */ |
2423 | while (a != b) { | |
2424 | if (a < b) | |
2425 | b -= a; | |
2426 | if (b < a) | |
2427 | a -= b; | |
2428 | } | |
2429 | /* LCM == product / GCD */ | |
200871ad | 2430 | blocks = (ochunk/512) * (nchunk/512) * odata * ndata / a; |
e9e43ec3 N |
2431 | |
2432 | if (ndata == odata) | |
1b13faf7 N |
2433 | while (blocks * 32 < sra->component_size && |
2434 | blocks < 16*1024*2) | |
2435 | blocks *= 2; | |
e9e43ec3 N |
2436 | stripes = blocks / (info->array.chunk_size/512) / odata; |
2437 | ||
1b13faf7 N |
2438 | /* check that the internal stripe cache is |
2439 | * large enough, or it won't work. | |
2440 | */ | |
2441 | cache = (nchunk < ochunk) ? ochunk : nchunk; | |
2442 | cache = cache * 4 / 4096; | |
2443 | if (cache < blocks / 8 / odisks + 16) | |
2444 | /* Make it big enough to hold 'blocks' */ | |
2445 | cache = blocks / 8 / odisks + 16; | |
2446 | if (sra->cache_size < cache) | |
2447 | sysfs_set_num(sra, NULL, "stripe_cache_size", | |
2448 | cache+1); | |
e9e43ec3 N |
2449 | |
2450 | memset(&bsb, 0, 512); | |
2451 | memcpy(bsb.magic, "md_backup_data-1", 16); | |
2452 | memcpy(&bsb.set_uuid, info->uuid, 16); | |
2453 | bsb.mtime = __cpu_to_le64(time(0)); | |
2454 | bsb.devstart2 = blocks; | |
2455 | ||
2456 | backup_fd = open(backup_file, O_RDWR|O_CREAT, S_IRUSR | S_IWUSR); | |
2457 | backup_list[0] = backup_fd; | |
2458 | backup_offsets[0] = 8 * 512; | |
2459 | fds = malloc(odisks * sizeof(fds[0])); | |
2460 | offsets = malloc(odisks * sizeof(offsets[0])); | |
2461 | for (d=0; d<odisks; d++) | |
2462 | fds[d] = -1; | |
2463 | ||
e9e43ec3 N |
2464 | for (sd = sra->devs; sd; sd = sd->next) { |
2465 | if (sd->disk.state & (1<<MD_DISK_FAULTY)) | |
2466 | continue; | |
2467 | if (sd->disk.state & (1<<MD_DISK_SYNC)) { | |
2468 | char *dn = map_dev(sd->disk.major, | |
2469 | sd->disk.minor, 1); | |
2470 | fds[sd->disk.raid_disk] | |
2471 | = dev_open(dn, O_RDONLY); | |
2472 | offsets[sd->disk.raid_disk] = sd->data_offset*512; | |
2473 | if (fds[sd->disk.raid_disk] < 0) { | |
2474 | fprintf(stderr, Name ": %s: cannot open component %s\n", | |
2475 | info->sys_name, dn?dn:"-unknown-"); | |
2476 | rv = 1; | |
2477 | goto release; | |
2478 | } | |
2479 | free(dn); | |
2480 | } | |
2481 | } | |
2482 | ||
2483 | switch(fork()) { | |
2484 | case 0: | |
2485 | close(mdfd); | |
2486 | mlockall(MCL_FUTURE); | |
2487 | if (info->delta_disks < 0) | |
2488 | done = child_shrink(-1, info, stripes, | |
2489 | fds, offsets, | |
2490 | info->array.raid_disks, | |
2491 | info->array.chunk_size, | |
2492 | info->array.level, info->array.layout, | |
2493 | odata, | |
2494 | 1, backup_list, backup_offsets); | |
2495 | else if (info->delta_disks == 0) { | |
2496 | /* The 'start' is a per-device stripe number. | |
2497 | * reshape_progress is a per-array sector number. | |
2498 | * So divide by ndata * chunk_size | |
2499 | */ | |
2500 | unsigned long long start = info->reshape_progress / ndata; | |
2501 | start /= (info->array.chunk_size/512); | |
2502 | done = child_same_size(-1, info, stripes, | |
2503 | fds, offsets, | |
2504 | start, | |
2505 | info->array.raid_disks, | |
2506 | info->array.chunk_size, | |
2507 | info->array.level, info->array.layout, | |
2508 | odata, | |
2509 | 1, backup_list, backup_offsets); | |
2510 | } | |
2511 | if (backup_file && done) | |
2512 | unlink(backup_file); | |
2513 | /* FIXME should I intuit a level change */ | |
2514 | exit(0); | |
2515 | case -1: | |
2516 | fprintf(stderr, Name ": Cannot run child to continue monitoring reshape: %s\n", | |
2517 | strerror(errno)); | |
2518 | return 1; | |
2519 | default: | |
2520 | break; | |
2521 | } | |
2522 | release: | |
2523 | return 0; | |
2524 | } | |
2525 | ||
2526 |