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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 NB |
22 | |
23 | #define min(a,b) (((a) < (b)) ? (a) : (b)) | |
24 | ||
25 | inline void sb_le_to_cpu(bitmap_super_t *sb) | |
26 | { | |
27 | sb->magic = __le32_to_cpu(sb->magic); | |
28 | sb->version = __le32_to_cpu(sb->version); | |
29 | /* uuid gets no translation */ | |
30 | sb->events = __le64_to_cpu(sb->events); | |
31 | sb->events_cleared = __le64_to_cpu(sb->events_cleared); | |
32 | sb->state = __le32_to_cpu(sb->state); | |
33 | sb->chunksize = __le32_to_cpu(sb->chunksize); | |
34 | sb->daemon_sleep = __le32_to_cpu(sb->daemon_sleep); | |
35 | sb->sync_size = __le64_to_cpu(sb->sync_size); | |
10ae45c1 | 36 | sb->write_behind = __le32_to_cpu(sb->write_behind); |
c82f047c NB |
37 | } |
38 | ||
39 | inline void sb_cpu_to_le(bitmap_super_t *sb) | |
40 | { | |
41 | sb_le_to_cpu(sb); /* these are really the same thing */ | |
42 | } | |
43 | ||
44 | mapping_t bitmap_states[] = { | |
45 | { "OK", 0 }, | |
46 | { "Out of date", 2 }, | |
47 | { NULL, -1 } | |
48 | }; | |
49 | ||
50 | const char *bitmap_state(int state_num) | |
51 | { | |
52 | char *state = map_num(bitmap_states, state_num); | |
53 | return state ? state : "Unknown"; | |
54 | } | |
55 | ||
56 | const char *human_chunksize(unsigned long bytes) | |
57 | { | |
58 | static char buf[16]; | |
59 | char *suffixes[] = { "B", "KB", "MB", "GB", "TB", NULL }; | |
60 | int i = 0; | |
61 | ||
62 | while (bytes >> 10) { | |
63 | bytes >>= 10; | |
64 | i++; | |
65 | } | |
66 | ||
8f23b0b3 | 67 | snprintf(buf, sizeof(buf), "%lu %s", bytes, suffixes[i]); |
c82f047c NB |
68 | |
69 | return buf; | |
70 | } | |
71 | ||
72 | typedef struct bitmap_info_s { | |
73 | bitmap_super_t sb; | |
74 | unsigned long long total_bits; | |
75 | unsigned long long dirty_bits; | |
76 | } bitmap_info_t; | |
77 | ||
78 | /* count the dirty bits in the first num_bits of byte */ | |
79 | inline int count_dirty_bits_byte(char byte, int num_bits) | |
80 | { | |
81 | int num = 0; | |
82 | ||
83 | switch (num_bits) { /* fall through... */ | |
84 | case 8: if (byte & 128) num++; | |
85 | case 7: if (byte & 64) num++; | |
86 | case 6: if (byte & 32) num++; | |
87 | case 5: if (byte & 16) num++; | |
88 | case 4: if (byte & 8) num++; | |
89 | case 3: if (byte & 4) num++; | |
90 | case 2: if (byte & 2) num++; | |
91 | case 1: if (byte & 1) num++; | |
92 | default: break; | |
93 | } | |
94 | ||
95 | return num; | |
96 | } | |
97 | ||
98 | int count_dirty_bits(char *buf, int num_bits) | |
99 | { | |
100 | int i, num = 0; | |
101 | ||
102 | for (i=0; i < num_bits / 8; i++) | |
103 | num += count_dirty_bits_byte(buf[i], 8); | |
104 | ||
105 | if (num_bits % 8) /* not an even byte boundary */ | |
106 | num += count_dirty_bits_byte(buf[i], num_bits % 8); | |
107 | ||
108 | return num; | |
109 | } | |
110 | ||
111 | /* calculate the size of the bitmap given the array size and bitmap chunksize */ | |
112 | unsigned long long bitmap_bits(unsigned long long array_size, | |
113 | unsigned long chunksize) | |
114 | { | |
115 | return (array_size * 512 + chunksize - 1) / chunksize; | |
116 | } | |
117 | ||
2a528478 N |
118 | unsigned long bitmap_sectors(struct bitmap_super_s *bsb) |
119 | { | |
120 | unsigned long long bits = bitmap_bits(__le64_to_cpu(bsb->sync_size), | |
121 | __le32_to_cpu(bsb->chunksize)); | |
122 | int bits_per_sector = 8*512; | |
123 | return (bits + bits_per_sector - 1) / bits_per_sector; | |
124 | } | |
125 | ||
126 | ||
c82f047c NB |
127 | bitmap_info_t *bitmap_fd_read(int fd, int brief) |
128 | { | |
4ccdb956 NB |
129 | /* Note: fd might be open O_DIRECT, so we must be |
130 | * careful to align reads properly | |
131 | */ | |
c82f047c NB |
132 | unsigned long long total_bits = 0, read_bits = 0, dirty_bits = 0; |
133 | bitmap_info_t *info; | |
4ccdb956 NB |
134 | char *buf, *unaligned; |
135 | int n, skip; | |
136 | ||
137 | unaligned = malloc(8192*2); | |
138 | buf = (char*) ((unsigned long)unaligned | 8191)+1; | |
139 | n = read(fd, buf, 8192); | |
c82f047c NB |
140 | |
141 | info = malloc(sizeof(*info)); | |
142 | if (info == NULL) { | |
838acbc2 NB |
143 | #if __GNUC__ < 3 |
144 | fprintf(stderr, Name ": failed to allocate %d bytes\n", | |
145 | (int)sizeof(*info)); | |
146 | #else | |
f9c25f1d | 147 | fprintf(stderr, Name ": failed to allocate %zd bytes\n", |
c82f047c | 148 | sizeof(*info)); |
838acbc2 | 149 | #endif |
c82f047c NB |
150 | return NULL; |
151 | } | |
152 | ||
4ccdb956 | 153 | if (n < sizeof(info->sb)) { |
c82f047c NB |
154 | fprintf(stderr, Name ": failed to read superblock of bitmap " |
155 | "file: %s\n", strerror(errno)); | |
156 | free(info); | |
4ccdb956 | 157 | free(unaligned); |
c82f047c NB |
158 | return NULL; |
159 | } | |
4ccdb956 NB |
160 | memcpy(&info->sb, buf, sizeof(info->sb)); |
161 | skip = sizeof(info->sb); | |
c82f047c NB |
162 | |
163 | sb_le_to_cpu(&info->sb); /* convert superblock to CPU byte ordering */ | |
aba69144 | 164 | |
c82f047c NB |
165 | if (brief || info->sb.sync_size == 0) |
166 | goto out; | |
167 | ||
168 | /* read the rest of the file counting total bits and dirty bits -- | |
169 | * we stop when either: | |
170 | * 1) we hit EOF, in which case we assume the rest of the bits (if any) | |
171 | * are dirty | |
172 | * 2) we've read the full bitmap, in which case we ignore any trailing | |
173 | * data in the file | |
174 | */ | |
175 | total_bits = bitmap_bits(info->sb.sync_size, info->sb.chunksize); | |
176 | ||
4ccdb956 | 177 | while(read_bits < total_bits) { |
c82f047c NB |
178 | unsigned long long remaining = total_bits - read_bits; |
179 | ||
4ccdb956 NB |
180 | if (n == 0) { |
181 | n = read(fd, buf, 8192); | |
182 | skip = 0; | |
183 | if (n <= 0) | |
184 | break; | |
185 | } | |
186 | if (remaining > (n-skip) * 8) /* we want the full buffer */ | |
187 | remaining = (n-skip) * 8; | |
188 | ||
189 | dirty_bits += count_dirty_bits(buf+skip, remaining); | |
c82f047c NB |
190 | |
191 | read_bits += remaining; | |
4ccdb956 | 192 | n = 0; |
c82f047c NB |
193 | } |
194 | ||
195 | if (read_bits < total_bits) { /* file truncated... */ | |
196 | fprintf(stderr, Name ": WARNING: bitmap file is not large " | |
f9c25f1d NB |
197 | "enough for array size %llu!\n\n", |
198 | (unsigned long long)info->sb.sync_size); | |
c82f047c NB |
199 | total_bits = read_bits; |
200 | } | |
201 | out: | |
202 | info->total_bits = total_bits; | |
203 | info->dirty_bits = dirty_bits; | |
204 | return info; | |
205 | } | |
206 | ||
34163fc7 | 207 | bitmap_info_t *bitmap_file_read(char *filename, int brief, struct supertype **stp) |
c82f047c NB |
208 | { |
209 | int fd; | |
210 | bitmap_info_t *info; | |
55935d51 | 211 | struct stat stb; |
34163fc7 | 212 | struct supertype *st = *stp; |
c82f047c | 213 | |
4ccdb956 NB |
214 | if (stat(filename, &stb) < 0) { |
215 | fprintf(stderr, Name ": failed to find file %s: %s\n", | |
216 | filename, strerror(errno)); | |
c82f047c NB |
217 | return NULL; |
218 | } | |
55935d51 | 219 | if ((S_IFMT & stb.st_mode) == S_IFBLK) { |
4ccdb956 NB |
220 | fd = open(filename, O_RDONLY); |
221 | if (fd < 0) { | |
222 | fprintf(stderr, Name ": failed to open bitmap file %s: %s\n", | |
223 | filename, strerror(errno)); | |
224 | return NULL; | |
225 | } | |
55935d51 NB |
226 | /* block device, so we are probably after an internal bitmap */ |
227 | if (!st) st = guess_super(fd); | |
228 | if (!st) { | |
229 | /* just look at device... */ | |
230 | lseek(fd, 0, 0); | |
aba69144 | 231 | } else { |
3da92f27 | 232 | st->ss->locate_bitmap(st, fd); |
55935d51 | 233 | } |
34163fc7 NB |
234 | ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */ |
235 | *stp = st; | |
4ccdb956 NB |
236 | } else { |
237 | fd = open(filename, O_RDONLY|O_DIRECT); | |
238 | if (fd < 0) { | |
239 | fprintf(stderr, Name ": failed to open bitmap file %s: %s\n", | |
240 | filename, strerror(errno)); | |
241 | return NULL; | |
242 | } | |
55935d51 | 243 | } |
c82f047c NB |
244 | |
245 | info = bitmap_fd_read(fd, brief); | |
246 | close(fd); | |
247 | return info; | |
248 | } | |
249 | ||
34163fc7 NB |
250 | __u32 swapl(__u32 l) |
251 | { | |
252 | char *c = (char*)&l; | |
253 | char t= c[0]; | |
254 | c[0] = c[3]; | |
255 | c[3] = t; | |
256 | ||
257 | t = c[1]; | |
258 | c[1] = c[2]; | |
259 | c[2] = t; | |
260 | return l; | |
261 | } | |
55935d51 | 262 | int ExamineBitmap(char *filename, int brief, struct supertype *st) |
c82f047c NB |
263 | { |
264 | /* | |
265 | * Read the bitmap file and display its contents | |
266 | */ | |
267 | ||
268 | bitmap_super_t *sb; | |
269 | bitmap_info_t *info; | |
270 | int rv = 1; | |
dfd4d8ee | 271 | char buf[64]; |
bf4fb153 | 272 | int swap; |
c82f047c | 273 | |
34163fc7 | 274 | info = bitmap_file_read(filename, brief, &st); |
c82f047c NB |
275 | if (!info) |
276 | return rv; | |
277 | ||
278 | sb = &info->sb; | |
279 | printf(" Filename : %s\n", filename); | |
280 | printf(" Magic : %08x\n", sb->magic); | |
281 | if (sb->magic != BITMAP_MAGIC) { | |
282 | fprintf(stderr, Name ": invalid bitmap magic 0x%x, the bitmap file appears to be corrupted\n", sb->magic); | |
283 | } | |
284 | printf(" Version : %d\n", sb->version); | |
dcec9ee5 NB |
285 | if (sb->version < BITMAP_MAJOR_LO || |
286 | sb->version > BITMAP_MAJOR_HI) { | |
c82f047c NB |
287 | fprintf(stderr, Name ": unknown bitmap version %d, either the bitmap file is corrupted or you need to upgrade your tools\n", sb->version); |
288 | goto free_info; | |
289 | } | |
290 | ||
291 | rv = 0; | |
bf4fb153 NB |
292 | if (st) |
293 | swap = st->ss->swapuuid; | |
294 | else | |
295 | #if __BYTE_ORDER == BIG_ENDIAN | |
296 | swap = 0; | |
297 | #else | |
298 | swap = 1; | |
299 | #endif | |
300 | if (swap) { | |
301 | printf(" UUID : %08x:%08x:%08x:%08x\n", | |
34163fc7 NB |
302 | swapl(*(__u32 *)(sb->uuid+0)), |
303 | swapl(*(__u32 *)(sb->uuid+4)), | |
304 | swapl(*(__u32 *)(sb->uuid+8)), | |
305 | swapl(*(__u32 *)(sb->uuid+12))); | |
306 | } else { | |
bf4fb153 | 307 | printf(" UUID : %08x:%08x:%08x:%08x\n", |
c82f047c NB |
308 | *(__u32 *)(sb->uuid+0), |
309 | *(__u32 *)(sb->uuid+4), | |
310 | *(__u32 *)(sb->uuid+8), | |
311 | *(__u32 *)(sb->uuid+12)); | |
34163fc7 | 312 | } |
f9c25f1d NB |
313 | printf(" Events : %llu\n", (unsigned long long)sb->events); |
314 | printf(" Events Cleared : %llu\n", (unsigned long long)sb->events_cleared); | |
c82f047c NB |
315 | printf(" State : %s\n", bitmap_state(sb->state)); |
316 | printf(" Chunksize : %s\n", human_chunksize(sb->chunksize)); | |
317 | printf(" Daemon : %ds flush period\n", sb->daemon_sleep); | |
dfd4d8ee NB |
318 | if (sb->write_behind) |
319 | sprintf(buf, "Allow write behind, max %d", sb->write_behind); | |
320 | else | |
321 | sprintf(buf, "Normal"); | |
322 | printf(" Write Mode : %s\n", buf); | |
f9c25f1d | 323 | printf(" Sync Size : %llu%s\n", (unsigned long long)sb->sync_size/2, |
f277ce36 | 324 | human_size(sb->sync_size * 512)); |
c82f047c NB |
325 | if (brief) |
326 | goto free_info; | |
327 | printf(" Bitmap : %llu bits (chunks), %llu dirty (%2.1f%%)\n", | |
328 | info->total_bits, info->dirty_bits, | |
329 | 100.0 * info->dirty_bits / (info->total_bits + 1)); | |
330 | free_info: | |
331 | free(info); | |
332 | return rv; | |
333 | } | |
334 | ||
335 | int CreateBitmap(char *filename, int force, char uuid[16], | |
1bf4e2d9 NB |
336 | unsigned long chunksize, unsigned long daemon_sleep, |
337 | unsigned long write_behind, | |
dcec9ee5 NB |
338 | unsigned long long array_size /* sectors */, |
339 | int major) | |
c82f047c NB |
340 | { |
341 | /* | |
342 | * Create a bitmap file with a superblock and (optionally) a full bitmap | |
343 | */ | |
344 | ||
345 | FILE *fp; | |
346 | int rv = 1; | |
347 | char block[512]; | |
348 | bitmap_super_t sb; | |
349 | long long bytes, filesize; | |
350 | ||
351 | if (!force && access(filename, F_OK) == 0) { | |
352 | fprintf(stderr, Name ": bitmap file %s already exists, use --force to overwrite\n", filename); | |
353 | return rv; | |
354 | } | |
355 | ||
356 | fp = fopen(filename, "w"); | |
357 | if (fp == NULL) { | |
358 | fprintf(stderr, Name ": failed to open bitmap file %s: %s\n", | |
359 | filename, strerror(errno)); | |
360 | return rv; | |
361 | } | |
362 | ||
1bfdbe01 NB |
363 | if (chunksize == UnSet) { |
364 | /* We don't want more than 2^21 chunks, as 2^11 fill up one | |
365 | * 4K page (2 bytes per chunk), and 2^10 address of those | |
b39827de NB |
366 | * fill up a 4K indexing page. 2^20 might be safer, especially |
367 | * on 64bit hosts, so use that. | |
1bfdbe01 NB |
368 | */ |
369 | chunksize = DEFAULT_BITMAP_CHUNK; | |
b39827de NB |
370 | /* <<20 for 2^20 chunks, >>9 to convert bytes to sectors */ |
371 | while (array_size > (chunksize << (20-9))) | |
1bfdbe01 NB |
372 | chunksize <<= 1; |
373 | } | |
374 | ||
c82f047c NB |
375 | memset(&sb, 0, sizeof(sb)); |
376 | sb.magic = BITMAP_MAGIC; | |
dcec9ee5 | 377 | sb.version = major; |
c82f047c NB |
378 | if (uuid != NULL) |
379 | memcpy(sb.uuid, uuid, 16); | |
380 | sb.chunksize = chunksize; | |
381 | sb.daemon_sleep = daemon_sleep; | |
dfd4d8ee | 382 | sb.write_behind = write_behind; |
c82f047c NB |
383 | sb.sync_size = array_size; |
384 | ||
385 | sb_cpu_to_le(&sb); /* convert to on-disk byte ordering */ | |
386 | ||
387 | if (fwrite(&sb, sizeof(sb), 1, fp) != 1) { | |
388 | fprintf(stderr, Name ": failed to write superblock to bitmap file %s: %s\n", filename, strerror(errno)); | |
389 | goto out; | |
390 | } | |
391 | ||
392 | /* calculate the size of the bitmap and write it to disk */ | |
393 | bytes = (bitmap_bits(array_size, chunksize) + 7) / 8; | |
394 | if (!bytes) { | |
395 | rv = 0; | |
396 | goto out; | |
397 | } | |
398 | ||
399 | filesize = bytes + sizeof(sb); | |
400 | ||
401 | memset(block, 0xff, sizeof(block)); | |
402 | ||
403 | while (bytes > 0) { | |
404 | if (fwrite(block, sizeof(block), 1, fp) != 1) { | |
405 | fprintf(stderr, Name ": failed to write bitmap file %s: %s\n", filename, strerror(errno)); | |
406 | goto out; | |
407 | } | |
408 | bytes -= sizeof(block); | |
409 | } | |
aba69144 | 410 | |
c82f047c | 411 | rv = 0; |
97a6748c | 412 | fflush(fp); |
c82f047c | 413 | /* make the file be the right size (well, to the nearest byte) */ |
1e0d770c NB |
414 | if (ftruncate(fileno(fp), filesize)) |
415 | perror("ftrunace"); | |
c82f047c NB |
416 | out: |
417 | fclose(fp); | |
418 | if (rv) | |
419 | unlink(filename); /* possibly corrupted, better get rid of it */ | |
420 | return rv; | |
421 | } | |
8131b493 | 422 | |
bf4fb153 | 423 | int bitmap_update_uuid(int fd, int *uuid, int swap) |
8131b493 NB |
424 | { |
425 | struct bitmap_super_s bm; | |
9fca7d62 NB |
426 | if (lseek(fd, 0, 0) != 0) |
427 | return 1; | |
8131b493 | 428 | if (read(fd, &bm, sizeof(bm)) != sizeof(bm)) |
9fca7d62 | 429 | return 1; |
8131b493 | 430 | if (bm.magic != __cpu_to_le32(BITMAP_MAGIC)) |
9fca7d62 | 431 | return 1; |
350f29f9 | 432 | copy_uuid(bm.uuid, uuid, swap); |
9fca7d62 NB |
433 | if (lseek(fd, 0, 0) != 0) |
434 | return 2; | |
435 | if (write(fd, &bm, sizeof(bm)) != sizeof(bm)) { | |
436 | lseek(fd, 0, 0); | |
437 | return 2; | |
438 | } | |
8131b493 | 439 | lseek(fd, 0, 0); |
9fca7d62 | 440 | return 0; |
8131b493 | 441 | } |