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Commit | Line | Data |
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c82f047c NB |
1 | /* |
2 | * mdadm - manage Linux "md" devices aka RAID arrays. | |
3 | * | |
4 | * Copyright (C) 2004 Paul Clements, SteelEye Technology, Inc. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | */ | |
20 | ||
c82f047c | 21 | #include "mdadm.h" |
c82f047c | 22 | |
c82f047c NB |
23 | inline void sb_le_to_cpu(bitmap_super_t *sb) |
24 | { | |
25 | sb->magic = __le32_to_cpu(sb->magic); | |
26 | sb->version = __le32_to_cpu(sb->version); | |
27 | /* uuid gets no translation */ | |
28 | sb->events = __le64_to_cpu(sb->events); | |
29 | sb->events_cleared = __le64_to_cpu(sb->events_cleared); | |
30 | sb->state = __le32_to_cpu(sb->state); | |
31 | sb->chunksize = __le32_to_cpu(sb->chunksize); | |
32 | sb->daemon_sleep = __le32_to_cpu(sb->daemon_sleep); | |
33 | sb->sync_size = __le64_to_cpu(sb->sync_size); | |
10ae45c1 | 34 | sb->write_behind = __le32_to_cpu(sb->write_behind); |
c82f047c NB |
35 | } |
36 | ||
37 | inline void sb_cpu_to_le(bitmap_super_t *sb) | |
38 | { | |
39 | sb_le_to_cpu(sb); /* these are really the same thing */ | |
40 | } | |
41 | ||
42 | mapping_t bitmap_states[] = { | |
43 | { "OK", 0 }, | |
44 | { "Out of date", 2 }, | |
45 | { NULL, -1 } | |
46 | }; | |
47 | ||
48 | const char *bitmap_state(int state_num) | |
49 | { | |
50 | char *state = map_num(bitmap_states, state_num); | |
51 | return state ? state : "Unknown"; | |
52 | } | |
53 | ||
54 | const char *human_chunksize(unsigned long bytes) | |
55 | { | |
56 | static char buf[16]; | |
57 | char *suffixes[] = { "B", "KB", "MB", "GB", "TB", NULL }; | |
58 | int i = 0; | |
59 | ||
60 | while (bytes >> 10) { | |
61 | bytes >>= 10; | |
62 | i++; | |
63 | } | |
64 | ||
8f23b0b3 | 65 | snprintf(buf, sizeof(buf), "%lu %s", bytes, suffixes[i]); |
c82f047c NB |
66 | |
67 | return buf; | |
68 | } | |
69 | ||
70 | typedef struct bitmap_info_s { | |
71 | bitmap_super_t sb; | |
72 | unsigned long long total_bits; | |
73 | unsigned long long dirty_bits; | |
74 | } bitmap_info_t; | |
75 | ||
76 | /* count the dirty bits in the first num_bits of byte */ | |
77 | inline int count_dirty_bits_byte(char byte, int num_bits) | |
78 | { | |
79 | int num = 0; | |
80 | ||
81 | switch (num_bits) { /* fall through... */ | |
82 | case 8: if (byte & 128) num++; | |
83 | case 7: if (byte & 64) num++; | |
84 | case 6: if (byte & 32) num++; | |
85 | case 5: if (byte & 16) num++; | |
86 | case 4: if (byte & 8) num++; | |
87 | case 3: if (byte & 4) num++; | |
88 | case 2: if (byte & 2) num++; | |
89 | case 1: if (byte & 1) num++; | |
90 | default: break; | |
91 | } | |
92 | ||
93 | return num; | |
94 | } | |
95 | ||
96 | int count_dirty_bits(char *buf, int num_bits) | |
97 | { | |
98 | int i, num = 0; | |
99 | ||
100 | for (i=0; i < num_bits / 8; i++) | |
101 | num += count_dirty_bits_byte(buf[i], 8); | |
102 | ||
103 | if (num_bits % 8) /* not an even byte boundary */ | |
104 | num += count_dirty_bits_byte(buf[i], num_bits % 8); | |
105 | ||
106 | return num; | |
107 | } | |
108 | ||
109 | /* calculate the size of the bitmap given the array size and bitmap chunksize */ | |
110 | unsigned long long bitmap_bits(unsigned long long array_size, | |
111 | unsigned long chunksize) | |
112 | { | |
113 | return (array_size * 512 + chunksize - 1) / chunksize; | |
114 | } | |
115 | ||
2a528478 N |
116 | unsigned long bitmap_sectors(struct bitmap_super_s *bsb) |
117 | { | |
118 | unsigned long long bits = bitmap_bits(__le64_to_cpu(bsb->sync_size), | |
119 | __le32_to_cpu(bsb->chunksize)); | |
120 | int bits_per_sector = 8*512; | |
121 | return (bits + bits_per_sector - 1) / bits_per_sector; | |
122 | } | |
123 | ||
124 | ||
c82f047c NB |
125 | bitmap_info_t *bitmap_fd_read(int fd, int brief) |
126 | { | |
4ccdb956 NB |
127 | /* Note: fd might be open O_DIRECT, so we must be |
128 | * careful to align reads properly | |
129 | */ | |
c82f047c NB |
130 | unsigned long long total_bits = 0, read_bits = 0, dirty_bits = 0; |
131 | bitmap_info_t *info; | |
6416d527 | 132 | void *buf; |
f21e18ca | 133 | unsigned int n, skip; |
4ccdb956 | 134 | |
a7322ae1 | 135 | if (posix_memalign(&buf, 4096, 8192) != 0) { |
e7b84f9d | 136 | pr_err("failed to allocate 8192 bytes\n"); |
3d2c4fc7 DW |
137 | return NULL; |
138 | } | |
4ccdb956 | 139 | n = read(fd, buf, 8192); |
c82f047c | 140 | |
503975b9 | 141 | info = xmalloc(sizeof(*info)); |
c82f047c | 142 | |
4ccdb956 | 143 | if (n < sizeof(info->sb)) { |
e7b84f9d N |
144 | pr_err("failed to read superblock of bitmap " |
145 | "file: %s\n", strerror(errno)); | |
c82f047c | 146 | free(info); |
39c74d5e | 147 | free(buf); |
c82f047c NB |
148 | return NULL; |
149 | } | |
4ccdb956 NB |
150 | memcpy(&info->sb, buf, sizeof(info->sb)); |
151 | skip = sizeof(info->sb); | |
c82f047c NB |
152 | |
153 | sb_le_to_cpu(&info->sb); /* convert superblock to CPU byte ordering */ | |
aba69144 | 154 | |
b47dff66 | 155 | if (brief || info->sb.sync_size == 0 || info->sb.chunksize == 0) |
c82f047c NB |
156 | goto out; |
157 | ||
158 | /* read the rest of the file counting total bits and dirty bits -- | |
159 | * we stop when either: | |
160 | * 1) we hit EOF, in which case we assume the rest of the bits (if any) | |
161 | * are dirty | |
162 | * 2) we've read the full bitmap, in which case we ignore any trailing | |
163 | * data in the file | |
164 | */ | |
165 | total_bits = bitmap_bits(info->sb.sync_size, info->sb.chunksize); | |
166 | ||
4ccdb956 | 167 | while(read_bits < total_bits) { |
c82f047c NB |
168 | unsigned long long remaining = total_bits - read_bits; |
169 | ||
4ccdb956 NB |
170 | if (n == 0) { |
171 | n = read(fd, buf, 8192); | |
172 | skip = 0; | |
173 | if (n <= 0) | |
174 | break; | |
175 | } | |
176 | if (remaining > (n-skip) * 8) /* we want the full buffer */ | |
177 | remaining = (n-skip) * 8; | |
178 | ||
179 | dirty_bits += count_dirty_bits(buf+skip, remaining); | |
c82f047c NB |
180 | |
181 | read_bits += remaining; | |
4ccdb956 | 182 | n = 0; |
c82f047c NB |
183 | } |
184 | ||
185 | if (read_bits < total_bits) { /* file truncated... */ | |
e7b84f9d | 186 | pr_err("WARNING: bitmap file is not large " |
f9c25f1d NB |
187 | "enough for array size %llu!\n\n", |
188 | (unsigned long long)info->sb.sync_size); | |
c82f047c NB |
189 | total_bits = read_bits; |
190 | } | |
191 | out: | |
39c74d5e | 192 | free(buf); |
c82f047c NB |
193 | info->total_bits = total_bits; |
194 | info->dirty_bits = dirty_bits; | |
195 | return info; | |
196 | } | |
197 | ||
34163fc7 | 198 | bitmap_info_t *bitmap_file_read(char *filename, int brief, struct supertype **stp) |
c82f047c NB |
199 | { |
200 | int fd; | |
201 | bitmap_info_t *info; | |
55935d51 | 202 | struct stat stb; |
34163fc7 | 203 | struct supertype *st = *stp; |
c82f047c | 204 | |
4ccdb956 | 205 | if (stat(filename, &stb) < 0) { |
e7b84f9d | 206 | pr_err("failed to find file %s: %s\n", |
4ccdb956 | 207 | filename, strerror(errno)); |
c82f047c NB |
208 | return NULL; |
209 | } | |
55935d51 | 210 | if ((S_IFMT & stb.st_mode) == S_IFBLK) { |
4ccdb956 NB |
211 | fd = open(filename, O_RDONLY); |
212 | if (fd < 0) { | |
e7b84f9d | 213 | pr_err("failed to open bitmap file %s: %s\n", |
4ccdb956 NB |
214 | filename, strerror(errno)); |
215 | return NULL; | |
216 | } | |
55935d51 NB |
217 | /* block device, so we are probably after an internal bitmap */ |
218 | if (!st) st = guess_super(fd); | |
219 | if (!st) { | |
220 | /* just look at device... */ | |
221 | lseek(fd, 0, 0); | |
ebeb3663 | 222 | } else if (!st->ss->locate_bitmap) { |
e7b84f9d | 223 | pr_err("No bitmap possible with %s metadata\n", |
ebeb3663 N |
224 | st->ss->name); |
225 | return NULL; | |
226 | } else | |
3da92f27 | 227 | st->ss->locate_bitmap(st, fd); |
ebeb3663 | 228 | |
34163fc7 NB |
229 | ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */ |
230 | *stp = st; | |
4ccdb956 NB |
231 | } else { |
232 | fd = open(filename, O_RDONLY|O_DIRECT); | |
233 | if (fd < 0) { | |
e7b84f9d | 234 | pr_err("failed to open bitmap file %s: %s\n", |
4ccdb956 NB |
235 | filename, strerror(errno)); |
236 | return NULL; | |
237 | } | |
55935d51 | 238 | } |
c82f047c NB |
239 | |
240 | info = bitmap_fd_read(fd, brief); | |
241 | close(fd); | |
242 | return info; | |
243 | } | |
244 | ||
34163fc7 NB |
245 | __u32 swapl(__u32 l) |
246 | { | |
247 | char *c = (char*)&l; | |
248 | char t= c[0]; | |
249 | c[0] = c[3]; | |
250 | c[3] = t; | |
251 | ||
252 | t = c[1]; | |
253 | c[1] = c[2]; | |
254 | c[2] = t; | |
255 | return l; | |
256 | } | |
55935d51 | 257 | int ExamineBitmap(char *filename, int brief, struct supertype *st) |
c82f047c NB |
258 | { |
259 | /* | |
260 | * Read the bitmap file and display its contents | |
261 | */ | |
262 | ||
263 | bitmap_super_t *sb; | |
264 | bitmap_info_t *info; | |
265 | int rv = 1; | |
dfd4d8ee | 266 | char buf[64]; |
bf4fb153 | 267 | int swap; |
caa0f6c6 | 268 | __u32 uuid32[4]; |
c82f047c | 269 | |
34163fc7 | 270 | info = bitmap_file_read(filename, brief, &st); |
c82f047c NB |
271 | if (!info) |
272 | return rv; | |
273 | ||
274 | sb = &info->sb; | |
275 | printf(" Filename : %s\n", filename); | |
276 | printf(" Magic : %08x\n", sb->magic); | |
277 | if (sb->magic != BITMAP_MAGIC) { | |
e7b84f9d | 278 | pr_err("invalid bitmap magic 0x%x, the bitmap file appears to be corrupted\n", sb->magic); |
c82f047c NB |
279 | } |
280 | printf(" Version : %d\n", sb->version); | |
dcec9ee5 NB |
281 | if (sb->version < BITMAP_MAJOR_LO || |
282 | sb->version > BITMAP_MAJOR_HI) { | |
e7b84f9d | 283 | pr_err("unknown bitmap version %d, either the bitmap file is corrupted or you need to upgrade your tools\n", sb->version); |
c82f047c NB |
284 | goto free_info; |
285 | } | |
286 | ||
287 | rv = 0; | |
bf4fb153 NB |
288 | if (st) |
289 | swap = st->ss->swapuuid; | |
290 | else | |
291 | #if __BYTE_ORDER == BIG_ENDIAN | |
292 | swap = 0; | |
293 | #else | |
294 | swap = 1; | |
295 | #endif | |
caa0f6c6 N |
296 | memcpy(uuid32, sb->uuid, 16); |
297 | if (swap) | |
298 | printf(" UUID : %08x:%08x:%08x:%08x\n", | |
299 | swapl(uuid32[0]), | |
300 | swapl(uuid32[1]), | |
301 | swapl(uuid32[2]), | |
302 | swapl(uuid32[3])); | |
303 | else | |
304 | printf(" UUID : %08x:%08x:%08x:%08x\n", | |
305 | uuid32[0], | |
306 | uuid32[1], | |
307 | uuid32[2], | |
308 | uuid32[3]); | |
309 | ||
f9c25f1d NB |
310 | printf(" Events : %llu\n", (unsigned long long)sb->events); |
311 | printf(" Events Cleared : %llu\n", (unsigned long long)sb->events_cleared); | |
c82f047c NB |
312 | printf(" State : %s\n", bitmap_state(sb->state)); |
313 | printf(" Chunksize : %s\n", human_chunksize(sb->chunksize)); | |
314 | printf(" Daemon : %ds flush period\n", sb->daemon_sleep); | |
dfd4d8ee NB |
315 | if (sb->write_behind) |
316 | sprintf(buf, "Allow write behind, max %d", sb->write_behind); | |
317 | else | |
318 | sprintf(buf, "Normal"); | |
319 | printf(" Write Mode : %s\n", buf); | |
f9c25f1d | 320 | printf(" Sync Size : %llu%s\n", (unsigned long long)sb->sync_size/2, |
f277ce36 | 321 | human_size(sb->sync_size * 512)); |
c82f047c NB |
322 | if (brief) |
323 | goto free_info; | |
324 | printf(" Bitmap : %llu bits (chunks), %llu dirty (%2.1f%%)\n", | |
325 | info->total_bits, info->dirty_bits, | |
6c9a5fa1 | 326 | 100.0 * info->dirty_bits / (info->total_bits?:1)); |
c82f047c NB |
327 | free_info: |
328 | free(info); | |
329 | return rv; | |
330 | } | |
331 | ||
332 | int CreateBitmap(char *filename, int force, char uuid[16], | |
1bf4e2d9 NB |
333 | unsigned long chunksize, unsigned long daemon_sleep, |
334 | unsigned long write_behind, | |
dcec9ee5 NB |
335 | unsigned long long array_size /* sectors */, |
336 | int major) | |
c82f047c NB |
337 | { |
338 | /* | |
339 | * Create a bitmap file with a superblock and (optionally) a full bitmap | |
340 | */ | |
341 | ||
342 | FILE *fp; | |
343 | int rv = 1; | |
344 | char block[512]; | |
345 | bitmap_super_t sb; | |
346 | long long bytes, filesize; | |
347 | ||
348 | if (!force && access(filename, F_OK) == 0) { | |
e7b84f9d | 349 | pr_err("bitmap file %s already exists, use --force to overwrite\n", filename); |
c82f047c NB |
350 | return rv; |
351 | } | |
352 | ||
353 | fp = fopen(filename, "w"); | |
354 | if (fp == NULL) { | |
e7b84f9d | 355 | pr_err("failed to open bitmap file %s: %s\n", |
c82f047c NB |
356 | filename, strerror(errno)); |
357 | return rv; | |
358 | } | |
359 | ||
1bfdbe01 NB |
360 | if (chunksize == UnSet) { |
361 | /* We don't want more than 2^21 chunks, as 2^11 fill up one | |
362 | * 4K page (2 bytes per chunk), and 2^10 address of those | |
b39827de NB |
363 | * fill up a 4K indexing page. 2^20 might be safer, especially |
364 | * on 64bit hosts, so use that. | |
1bfdbe01 NB |
365 | */ |
366 | chunksize = DEFAULT_BITMAP_CHUNK; | |
b39827de | 367 | /* <<20 for 2^20 chunks, >>9 to convert bytes to sectors */ |
3e416561 | 368 | while (array_size > ((unsigned long long)chunksize << (20-9))) |
1bfdbe01 NB |
369 | chunksize <<= 1; |
370 | } | |
371 | ||
c82f047c NB |
372 | memset(&sb, 0, sizeof(sb)); |
373 | sb.magic = BITMAP_MAGIC; | |
dcec9ee5 | 374 | sb.version = major; |
c82f047c NB |
375 | if (uuid != NULL) |
376 | memcpy(sb.uuid, uuid, 16); | |
377 | sb.chunksize = chunksize; | |
378 | sb.daemon_sleep = daemon_sleep; | |
dfd4d8ee | 379 | sb.write_behind = write_behind; |
c82f047c NB |
380 | sb.sync_size = array_size; |
381 | ||
382 | sb_cpu_to_le(&sb); /* convert to on-disk byte ordering */ | |
383 | ||
384 | if (fwrite(&sb, sizeof(sb), 1, fp) != 1) { | |
e7b84f9d | 385 | pr_err("failed to write superblock to bitmap file %s: %s\n", filename, strerror(errno)); |
c82f047c NB |
386 | goto out; |
387 | } | |
388 | ||
389 | /* calculate the size of the bitmap and write it to disk */ | |
390 | bytes = (bitmap_bits(array_size, chunksize) + 7) / 8; | |
391 | if (!bytes) { | |
392 | rv = 0; | |
393 | goto out; | |
394 | } | |
395 | ||
396 | filesize = bytes + sizeof(sb); | |
397 | ||
398 | memset(block, 0xff, sizeof(block)); | |
399 | ||
400 | while (bytes > 0) { | |
401 | if (fwrite(block, sizeof(block), 1, fp) != 1) { | |
e7b84f9d | 402 | pr_err("failed to write bitmap file %s: %s\n", filename, strerror(errno)); |
c82f047c NB |
403 | goto out; |
404 | } | |
405 | bytes -= sizeof(block); | |
406 | } | |
aba69144 | 407 | |
c82f047c | 408 | rv = 0; |
97a6748c | 409 | fflush(fp); |
c82f047c | 410 | /* make the file be the right size (well, to the nearest byte) */ |
1e0d770c NB |
411 | if (ftruncate(fileno(fp), filesize)) |
412 | perror("ftrunace"); | |
c82f047c NB |
413 | out: |
414 | fclose(fp); | |
415 | if (rv) | |
416 | unlink(filename); /* possibly corrupted, better get rid of it */ | |
417 | return rv; | |
418 | } | |
8131b493 | 419 | |
bf4fb153 | 420 | int bitmap_update_uuid(int fd, int *uuid, int swap) |
8131b493 NB |
421 | { |
422 | struct bitmap_super_s bm; | |
9fca7d62 NB |
423 | if (lseek(fd, 0, 0) != 0) |
424 | return 1; | |
8131b493 | 425 | if (read(fd, &bm, sizeof(bm)) != sizeof(bm)) |
9fca7d62 | 426 | return 1; |
8131b493 | 427 | if (bm.magic != __cpu_to_le32(BITMAP_MAGIC)) |
9fca7d62 | 428 | return 1; |
350f29f9 | 429 | copy_uuid(bm.uuid, uuid, swap); |
9fca7d62 NB |
430 | if (lseek(fd, 0, 0) != 0) |
431 | return 2; | |
432 | if (write(fd, &bm, sizeof(bm)) != sizeof(bm)) { | |
433 | lseek(fd, 0, 0); | |
434 | return 2; | |
435 | } | |
8131b493 | 436 | lseek(fd, 0, 0); |
9fca7d62 | 437 | return 0; |
8131b493 | 438 | } |