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a0948ffe | 1 | /* |
4d72b337 | 2 | * Low-level libblkid probing API |
a0948ffe | 3 | * |
4d72b337 | 4 | * Copyright (C) 2008-2009 Karel Zak <kzak@redhat.com> |
a0948ffe | 5 | * |
a0948ffe KZ |
6 | * This file may be redistributed under the terms of the |
7 | * GNU Lesser General Public License. | |
a0948ffe KZ |
8 | */ |
9 | ||
4d72b337 KZ |
10 | /** |
11 | * SECTION: lowprobe | |
12 | * @title: Low-level probing | |
13 | * @short_description: low-level prober initialization | |
14 | * | |
15 | * The low-level probing routines always and directly read information from | |
16 | * the selected (see blkid_probe_set_device()) device. | |
17 | * | |
18 | * The probing routines are grouped together into separate chains. Currently, | |
e9c2d185 | 19 | * the library provides superblocks, partitions and topology chains. |
4d72b337 KZ |
20 | * |
21 | * The probing routines is possible to filter (enable/disable) by type (e.g. | |
22 | * fstype "vfat" or partype "gpt") or by usage flags (e.g. BLKID_USAGE_RAID). | |
488e52be | 23 | * These filters are per-chain. Note that always when you touch the chain |
3b159691 | 24 | * filter the current probing position is reset and probing starts from |
488e52be KZ |
25 | * scratch. It means that the chain filter should not be modified during |
26 | * probing, for example in loop where you call blkid_do_probe(). | |
27 | * | |
28 | * For more details see the chain specific documentation. | |
4d72b337 KZ |
29 | * |
30 | * The low-level API provides two ways how access to probing results. | |
31 | * | |
32 | * 1. The NAME=value (tag) interface. This interface is older and returns all data | |
33 | * as strings. This interface is generic for all chains. | |
34 | * | |
35 | * 2. The binary interfaces. These interfaces return data in the native formats. | |
36 | * The interface is always specific to the probing chain. | |
488e52be | 37 | * |
e9c2d185 | 38 | * Note that the previous probing result (binary or NAME=value) is always |
3b159691 | 39 | * zeroized when a chain probing function is called. For example: |
e9c2d185 KZ |
40 | * |
41 | * <informalexample> | |
42 | * <programlisting> | |
43 | * blkid_probe_enable_partitions(pr, TRUE); | |
44 | * blkid_probe_enable_superblocks(pr, FALSE); | |
45 | * | |
46 | * blkid_do_safeprobe(pr); | |
47 | * </programlisting> | |
48 | * </informalexample> | |
49 | * | |
50 | * overwrites the previous probing result for the partitions chain, the superblocks | |
51 | * result is not modified. | |
4d72b337 KZ |
52 | */ |
53 | ||
54 | /** | |
55 | * SECTION: lowprobe-tags | |
56 | * @title: Low-level tags | |
57 | * @short_description: generic NAME=value interface. | |
58 | * | |
59 | * The probing routines inside the chain are mutually exclusive by default -- | |
60 | * only few probing routines are marked as "tolerant". The "tolerant" probing | |
61 | * routines are used for filesystem which can share the same device with any | |
62 | * other filesystem. The blkid_do_safeprobe() checks for the "tolerant" flag. | |
63 | * | |
64 | * The SUPERBLOCKS chain is enabled by default. The all others chains is | |
65 | * necessary to enable by blkid_probe_enable_'CHAINNAME'(). See chains specific | |
488e52be | 66 | * documentation. |
4d72b337 KZ |
67 | * |
68 | * The blkid_do_probe() function returns a result from only one probing | |
69 | * routine, and the next call from the next probing routine. It means you need | |
70 | * to call the function in loop, for example: | |
71 | * | |
72 | * <informalexample> | |
73 | * <programlisting> | |
74 | * while((blkid_do_probe(pr) == 0) | |
75 | * ... use result ... | |
76 | * </programlisting> | |
77 | * </informalexample> | |
78 | * | |
79 | * The blkid_do_safeprobe() is the same as blkid_do_probe(), but returns only | |
80 | * first probing result for every enabled chain. This function checks for | |
81 | * ambivalent results (e.g. more "intolerant" filesystems superblocks on the | |
82 | * device). | |
83 | * | |
84 | * The probing result is set of NAME=value pairs (the NAME is always unique). | |
85 | */ | |
86 | ||
a0948ffe KZ |
87 | #include <stdio.h> |
88 | #include <string.h> | |
89 | #include <stdlib.h> | |
90 | #include <unistd.h> | |
91 | #include <fcntl.h> | |
92 | #include <ctype.h> | |
93 | #include <sys/types.h> | |
55113b15 C |
94 | #ifdef HAVE_LINUX_CDROM_H |
95 | #include <linux/cdrom.h> | |
96 | #endif | |
a0948ffe KZ |
97 | #ifdef HAVE_SYS_STAT_H |
98 | #include <sys/stat.h> | |
99 | #endif | |
a0948ffe KZ |
100 | #ifdef HAVE_ERRNO_H |
101 | #include <errno.h> | |
102 | #endif | |
c4206331 | 103 | #include <inttypes.h> |
51410fc6 | 104 | #include <stdint.h> |
8c0dc071 | 105 | #include <stdarg.h> |
109df14f | 106 | #include <limits.h> |
8c0dc071 | 107 | |
51410fc6 | 108 | #ifdef HAVE_LIBUUID |
7ee96990 | 109 | # include <uuid.h> |
51410fc6 | 110 | #endif |
a0948ffe | 111 | |
51410fc6 | 112 | #include "blkidP.h" |
e12c9866 | 113 | #include "all-io.h" |
25472aaf | 114 | #include "sysfs.h" |
22e9e9c8 | 115 | #include "strutils.h" |
6c4a7811 | 116 | #include "list.h" |
219227c2 | 117 | |
52448df8 KZ |
118 | /* chains */ |
119 | extern const struct blkid_chaindrv superblocks_drv; | |
cc33d693 | 120 | extern const struct blkid_chaindrv topology_drv; |
e4799a35 | 121 | extern const struct blkid_chaindrv partitions_drv; |
52448df8 KZ |
122 | |
123 | /* | |
124 | * All supported chains | |
125 | */ | |
126 | static const struct blkid_chaindrv *chains_drvs[] = { | |
127 | [BLKID_CHAIN_SUBLKS] = &superblocks_drv, | |
cc33d693 | 128 | [BLKID_CHAIN_TOPLGY] = &topology_drv, |
e4799a35 | 129 | [BLKID_CHAIN_PARTS] = &partitions_drv |
52448df8 KZ |
130 | }; |
131 | ||
6c4a7811 | 132 | static struct blkid_prval *blkid_probe_new_value(void); |
af17d349 | 133 | static void blkid_probe_reset_values(blkid_probe pr); |
15a8fb42 | 134 | static void blkid_probe_reset_buffer(blkid_probe pr); |
52448df8 | 135 | |
52448df8 KZ |
136 | /** |
137 | * blkid_new_probe: | |
138 | * | |
3b159691 | 139 | * Returns: a pointer to the newly allocated probe struct or NULL in case of error. |
a0948ffe | 140 | */ |
51410fc6 | 141 | blkid_probe blkid_new_probe(void) |
a0948ffe | 142 | { |
52448df8 KZ |
143 | int i; |
144 | blkid_probe pr; | |
145 | ||
7a458332 | 146 | blkid_init_debug(0); |
52448df8 KZ |
147 | pr = calloc(1, sizeof(struct blkid_struct_probe)); |
148 | if (!pr) | |
149 | return NULL; | |
150 | ||
c62a6311 | 151 | DBG(LOWPROBE, ul_debug("allocate a new probe %p", pr)); |
fd9f45e1 | 152 | |
52448df8 KZ |
153 | /* initialize chains */ |
154 | for (i = 0; i < BLKID_NCHAINS; i++) { | |
155 | pr->chains[i].driver = chains_drvs[i]; | |
156 | pr->chains[i].flags = chains_drvs[i]->dflt_flags; | |
157 | pr->chains[i].enabled = chains_drvs[i]->dflt_enabled; | |
158 | } | |
15a8fb42 | 159 | INIT_LIST_HEAD(&pr->buffers); |
af17d349 | 160 | INIT_LIST_HEAD(&pr->values); |
52448df8 | 161 | return pr; |
a0948ffe KZ |
162 | } |
163 | ||
fd9f45e1 KZ |
164 | /* |
165 | * Clone @parent, the new clone shares all, but except: | |
166 | * | |
167 | * - probing result | |
168 | * - bufferes if another device (or offset) is set to the prober | |
169 | */ | |
170 | blkid_probe blkid_clone_probe(blkid_probe parent) | |
171 | { | |
172 | blkid_probe pr; | |
173 | ||
174 | if (!parent) | |
175 | return NULL; | |
176 | ||
c62a6311 | 177 | DBG(LOWPROBE, ul_debug("allocate a probe clone")); |
fd9f45e1 KZ |
178 | |
179 | pr = blkid_new_probe(); | |
180 | if (!pr) | |
181 | return NULL; | |
182 | ||
183 | pr->fd = parent->fd; | |
184 | pr->off = parent->off; | |
185 | pr->size = parent->size; | |
186 | pr->devno = parent->devno; | |
187 | pr->disk_devno = parent->disk_devno; | |
188 | pr->blkssz = parent->blkssz; | |
189 | pr->flags = parent->flags; | |
190 | pr->parent = parent; | |
191 | ||
6e650f88 KZ |
192 | pr->flags &= ~BLKID_FL_PRIVATE_FD; |
193 | ||
fd9f45e1 KZ |
194 | return pr; |
195 | } | |
196 | ||
197 | ||
198 | ||
f38db0cf KZ |
199 | /** |
200 | * blkid_new_probe_from_filename: | |
201 | * @filename: device or regular file | |
202 | * | |
203 | * This function is same as call open(filename), blkid_new_probe() and | |
204 | * blkid_probe_set_device(pr, fd, 0, 0). | |
205 | * | |
206 | * The @filename is closed by blkid_free_probe() or by the | |
207 | * blkid_probe_set_device() call. | |
208 | * | |
209 | * Returns: a pointer to the newly allocated probe struct or NULL in case of | |
210 | * error. | |
211 | */ | |
212 | blkid_probe blkid_new_probe_from_filename(const char *filename) | |
213 | { | |
214 | int fd = -1; | |
215 | blkid_probe pr = NULL; | |
216 | ||
217 | if (!filename) | |
218 | return NULL; | |
219 | ||
49a8f58e | 220 | fd = open(filename, O_RDONLY|O_CLOEXEC); |
f38db0cf KZ |
221 | if (fd < 0) |
222 | return NULL; | |
223 | ||
224 | pr = blkid_new_probe(); | |
225 | if (!pr) | |
226 | goto err; | |
227 | ||
228 | if (blkid_probe_set_device(pr, fd, 0, 0)) | |
229 | goto err; | |
230 | ||
a9eef56c | 231 | pr->flags |= BLKID_FL_PRIVATE_FD; |
f38db0cf KZ |
232 | return pr; |
233 | err: | |
234 | if (fd >= 0) | |
235 | close(fd); | |
236 | blkid_free_probe(pr); | |
237 | return NULL; | |
238 | } | |
239 | ||
52448df8 KZ |
240 | /** |
241 | * blkid_free_probe: | |
242 | * @pr: probe | |
243 | * | |
244 | * Deallocates the probe struct, buffers and all allocated | |
51410fc6 | 245 | * data that are associated with this probing control struct. |
a0948ffe | 246 | */ |
51410fc6 | 247 | void blkid_free_probe(blkid_probe pr) |
a0948ffe | 248 | { |
52448df8 KZ |
249 | int i; |
250 | ||
51410fc6 KZ |
251 | if (!pr) |
252 | return; | |
52448df8 KZ |
253 | |
254 | for (i = 0; i < BLKID_NCHAINS; i++) { | |
255 | struct blkid_chain *ch = &pr->chains[i]; | |
256 | ||
257 | if (ch->driver->free_data) | |
258 | ch->driver->free_data(pr, ch->data); | |
259 | free(ch->fltr); | |
260 | } | |
f38db0cf | 261 | |
a9eef56c | 262 | if ((pr->flags & BLKID_FL_PRIVATE_FD) && pr->fd >= 0) |
f38db0cf | 263 | close(pr->fd); |
15a8fb42 | 264 | blkid_probe_reset_buffer(pr); |
af17d349 | 265 | blkid_probe_reset_values(pr); |
fd9f45e1 KZ |
266 | blkid_free_probe(pr->disk_probe); |
267 | ||
c62a6311 | 268 | DBG(LOWPROBE, ul_debug("free probe %p", pr)); |
51410fc6 | 269 | free(pr); |
a0948ffe KZ |
270 | } |
271 | ||
af17d349 | 272 | void blkid_probe_free_value(struct blkid_prval *v) |
6c4a7811 OO |
273 | { |
274 | if (!v) | |
275 | return; | |
276 | ||
277 | list_del(&v->prvals); | |
278 | free(v->data); | |
af17d349 KZ |
279 | |
280 | DBG(LOWPROBE, ul_debug(" free value %s", v->name)); | |
6c4a7811 OO |
281 | free(v); |
282 | } | |
52448df8 | 283 | |
9bdf6885 KZ |
284 | /* |
285 | * Removes chain values from probing result. | |
286 | */ | |
af17d349 | 287 | void blkid_probe_chain_reset_values(blkid_probe pr, struct blkid_chain *chn) |
9bdf6885 | 288 | { |
9bdf6885 | 289 | |
6c4a7811 | 290 | struct list_head *p, *pnext; |
9bdf6885 | 291 | |
af17d349 | 292 | if (!pr || list_empty(&pr->values)) |
6c4a7811 OO |
293 | return; |
294 | ||
af17d349 KZ |
295 | DBG(LOWPROBE, ul_debug("reseting %s values", chn->driver->name)); |
296 | ||
297 | list_for_each_safe(p, pnext, &pr->values) { | |
6c4a7811 OO |
298 | struct blkid_prval *v = list_entry(p, |
299 | struct blkid_prval, prvals); | |
300 | ||
301 | if (v->chain == chn) | |
af17d349 | 302 | blkid_probe_free_value(v); |
9bdf6885 | 303 | } |
9bdf6885 KZ |
304 | } |
305 | ||
9e0f7bda KZ |
306 | static void blkid_probe_chain_reset_position(struct blkid_chain *chn) |
307 | { | |
308 | if (chn) | |
309 | chn->idx = -1; | |
310 | } | |
311 | ||
af17d349 KZ |
312 | /* |
313 | static struct blkid_prval *blkid_probe_copy_value(struct blkid_prval *src) | |
6c4a7811 | 314 | { |
af17d349 KZ |
315 | struct blkid_prval *dest = blkid_probe_new_value(); |
316 | ||
317 | if (!dest) | |
318 | return NULL; | |
319 | ||
6c4a7811 OO |
320 | memcpy(dest, src, sizeof(struct blkid_prval)); |
321 | ||
322 | dest->data = malloc(src->len); | |
323 | if (!dest->data) | |
324 | return NULL; | |
325 | ||
326 | memcpy(dest->data, src->data, src->len); | |
327 | ||
328 | INIT_LIST_HEAD(&dest->prvals); | |
6c4a7811 OO |
329 | return dest; |
330 | } | |
af17d349 | 331 | */ |
6c4a7811 | 332 | |
9bdf6885 | 333 | /* |
af17d349 | 334 | * Move chain values from probing result to @vals |
9bdf6885 | 335 | */ |
af17d349 KZ |
336 | int blkid_probe_chain_save_values(blkid_probe pr, struct blkid_chain *chn, |
337 | struct list_head *vals) | |
9bdf6885 | 338 | { |
af17d349 KZ |
339 | struct list_head *p, *pnext; |
340 | struct blkid_prval *v; | |
6c4a7811 | 341 | |
af17d349 | 342 | DBG(LOWPROBE, ul_debug("saving %s values", chn->driver->name)); |
6c4a7811 | 343 | |
af17d349 | 344 | list_for_each_safe(p, pnext, &pr->values) { |
9bdf6885 | 345 | |
af17d349 | 346 | v = list_entry(p, struct blkid_prval, prvals); |
9bdf6885 KZ |
347 | if (v->chain != chn) |
348 | continue; | |
6c4a7811 | 349 | |
af17d349 KZ |
350 | list_del(&v->prvals); |
351 | INIT_LIST_HEAD(&v->prvals); | |
6c4a7811 | 352 | |
af17d349 | 353 | list_add_tail(&v->prvals, vals); |
9bdf6885 | 354 | } |
6c4a7811 | 355 | return 0; |
9bdf6885 KZ |
356 | } |
357 | ||
358 | /* | |
359 | * Appends values from @vals to the probing result | |
360 | */ | |
af17d349 KZ |
361 | void blkid_probe_append_values_list(blkid_probe pr, struct list_head *vals) |
362 | { | |
363 | DBG(LOWPROBE, ul_debug("appending values")); | |
364 | ||
365 | list_splice(vals, &pr->values); | |
366 | INIT_LIST_HEAD(vals); | |
367 | } | |
368 | ||
369 | ||
370 | void blkid_probe_free_values_list(struct list_head *vals) | |
9bdf6885 | 371 | { |
af17d349 KZ |
372 | if (!vals) |
373 | return; | |
374 | ||
375 | DBG(LOWPROBE, ul_debug("freeing values list")); | |
376 | ||
377 | while (!list_empty(vals)) { | |
378 | struct blkid_prval *v = list_entry(vals->next, struct blkid_prval, prvals); | |
379 | blkid_probe_free_value(v); | |
380 | } | |
a0948ffe KZ |
381 | } |
382 | ||
1c1726a7 KZ |
383 | struct blkid_chain *blkid_probe_get_chain(blkid_probe pr) |
384 | { | |
385 | return pr->cur_chain; | |
386 | } | |
387 | ||
c89a1def KZ |
388 | static const char *blkid_probe_get_probername(blkid_probe pr) |
389 | { | |
390 | struct blkid_chain *chn = blkid_probe_get_chain(pr); | |
391 | ||
b9710f1f | 392 | if (chn && chn->idx >= 0 && (unsigned)chn->idx < chn->driver->nidinfos) |
c89a1def KZ |
393 | return chn->driver->idinfos[chn->idx]->name; |
394 | ||
395 | return NULL; | |
396 | } | |
397 | ||
22571ebb KZ |
398 | void *blkid_probe_get_binary_data(blkid_probe pr, struct blkid_chain *chn) |
399 | { | |
c81e7008 KZ |
400 | int rc, org_prob_flags; |
401 | struct blkid_chain *org_chn; | |
22571ebb | 402 | |
88923b08 | 403 | if (!pr || !chn) |
22571ebb KZ |
404 | return NULL; |
405 | ||
c81e7008 KZ |
406 | /* save the current setting -- the binary API has to be completely |
407 | * independent on the current probing status | |
408 | */ | |
409 | org_chn = pr->cur_chain; | |
410 | org_prob_flags = pr->prob_flags; | |
411 | ||
22571ebb | 412 | pr->cur_chain = chn; |
c81e7008 | 413 | pr->prob_flags = 0; |
22571ebb | 414 | chn->binary = TRUE; |
9e0f7bda | 415 | blkid_probe_chain_reset_position(chn); |
22571ebb KZ |
416 | |
417 | rc = chn->driver->probe(pr, chn); | |
418 | ||
419 | chn->binary = FALSE; | |
9e0f7bda | 420 | blkid_probe_chain_reset_position(chn); |
22571ebb | 421 | |
c81e7008 KZ |
422 | /* restore the original setting |
423 | */ | |
424 | pr->cur_chain = org_chn; | |
425 | pr->prob_flags = org_prob_flags; | |
426 | ||
d7be1a74 | 427 | if (rc != 0) |
22571ebb KZ |
428 | return NULL; |
429 | ||
c62a6311 | 430 | DBG(LOWPROBE, ul_debug("returning %s binary data", chn->driver->name)); |
22571ebb KZ |
431 | return chn->data; |
432 | } | |
433 | ||
434 | ||
52448df8 KZ |
435 | /** |
436 | * blkid_reset_probe: | |
437 | * @pr: probe | |
438 | * | |
44ef90bc KZ |
439 | * Zeroize probing results and resets the current probing (this has impact to |
440 | * blkid_do_probe() only). This function does not touch probing filters and | |
441 | * keeps assigned device. | |
52448df8 | 442 | */ |
51410fc6 | 443 | void blkid_reset_probe(blkid_probe pr) |
a0948ffe | 444 | { |
52448df8 KZ |
445 | int i; |
446 | ||
51410fc6 KZ |
447 | if (!pr) |
448 | return; | |
52448df8 | 449 | |
af17d349 | 450 | blkid_probe_reset_values(pr); |
89d39d22 | 451 | blkid_probe_set_wiper(pr, 0, 0); |
52448df8 | 452 | |
44ef90bc KZ |
453 | pr->cur_chain = NULL; |
454 | ||
52448df8 | 455 | for (i = 0; i < BLKID_NCHAINS; i++) |
9e0f7bda | 456 | blkid_probe_chain_reset_position(&pr->chains[i]); |
a0948ffe KZ |
457 | } |
458 | ||
46a734fd KZ |
459 | /*** |
460 | static int blkid_probe_dump_filter(blkid_probe pr, int chain) | |
461 | { | |
462 | struct blkid_chain *chn; | |
463 | int i; | |
464 | ||
465 | if (!pr || chain < 0 || chain >= BLKID_NCHAINS) | |
466 | return -1; | |
467 | ||
468 | chn = &pr->chains[chain]; | |
469 | ||
470 | if (!chn->fltr) | |
471 | return -1; | |
472 | ||
473 | for (i = 0; i < chn->driver->nidinfos; i++) { | |
474 | const struct blkid_idinfo *id = chn->driver->idinfos[i]; | |
475 | ||
c62a6311 | 476 | DBG(LOWPROBE, ul_debug("%d: %s: %s", |
46a734fd KZ |
477 | i, |
478 | id->name, | |
479 | blkid_bmp_get_item(chn->fltr, i) | |
480 | ? "disabled" : "enabled <--")); | |
46a734fd KZ |
481 | } |
482 | return 0; | |
483 | } | |
484 | ***/ | |
485 | ||
486 | /* | |
487 | * Returns properly initialized chain filter | |
488 | */ | |
489 | unsigned long *blkid_probe_get_filter(blkid_probe pr, int chain, int create) | |
490 | { | |
491 | struct blkid_chain *chn; | |
492 | ||
493 | if (!pr || chain < 0 || chain >= BLKID_NCHAINS) | |
494 | return NULL; | |
495 | ||
496 | chn = &pr->chains[chain]; | |
497 | ||
3b159691 | 498 | /* always when you touch the chain filter all indexes are reset and |
46a734fd KZ |
499 | * probing starts from scratch |
500 | */ | |
9e0f7bda | 501 | blkid_probe_chain_reset_position(chn); |
46a734fd KZ |
502 | pr->cur_chain = NULL; |
503 | ||
504 | if (!chn->driver->has_fltr || (!chn->fltr && !create)) | |
505 | return NULL; | |
506 | ||
507 | if (!chn->fltr) | |
508 | chn->fltr = calloc(1, blkid_bmp_nbytes(chn->driver->nidinfos)); | |
509 | else | |
510 | memset(chn->fltr, 0, blkid_bmp_nbytes(chn->driver->nidinfos)); | |
511 | ||
512 | /* blkid_probe_dump_filter(pr, chain); */ | |
513 | return chn->fltr; | |
514 | } | |
515 | ||
516 | /* | |
517 | * Generic private functions for filter setting | |
518 | */ | |
519 | int __blkid_probe_invert_filter(blkid_probe pr, int chain) | |
520 | { | |
c9f51c71 | 521 | size_t i; |
46a734fd | 522 | struct blkid_chain *chn; |
46a734fd | 523 | |
e3436956 KZ |
524 | if (!pr) |
525 | return -1; | |
526 | ||
46a734fd KZ |
527 | chn = &pr->chains[chain]; |
528 | ||
e8fc977a KZ |
529 | if (!chn->driver->has_fltr || !chn->fltr) |
530 | return -1; | |
531 | ||
46a734fd | 532 | for (i = 0; i < blkid_bmp_nwords(chn->driver->nidinfos); i++) |
e8fc977a | 533 | chn->fltr[i] = ~chn->fltr[i]; |
46a734fd | 534 | |
c62a6311 | 535 | DBG(LOWPROBE, ul_debug("probing filter inverted")); |
46a734fd KZ |
536 | /* blkid_probe_dump_filter(pr, chain); */ |
537 | return 0; | |
538 | } | |
539 | ||
540 | int __blkid_probe_reset_filter(blkid_probe pr, int chain) | |
541 | { | |
542 | return blkid_probe_get_filter(pr, chain, FALSE) ? 0 : -1; | |
543 | } | |
544 | ||
545 | int __blkid_probe_filter_types(blkid_probe pr, int chain, int flag, char *names[]) | |
546 | { | |
547 | unsigned long *fltr; | |
548 | struct blkid_chain *chn; | |
c9f51c71 | 549 | size_t i; |
46a734fd KZ |
550 | |
551 | fltr = blkid_probe_get_filter(pr, chain, TRUE); | |
552 | if (!fltr) | |
553 | return -1; | |
554 | ||
555 | chn = &pr->chains[chain]; | |
556 | ||
557 | for (i = 0; i < chn->driver->nidinfos; i++) { | |
558 | int has = 0; | |
559 | const struct blkid_idinfo *id = chn->driver->idinfos[i]; | |
560 | char **n; | |
561 | ||
562 | for (n = names; *n; n++) { | |
563 | if (!strcmp(id->name, *n)) { | |
564 | has = 1; | |
565 | break; | |
566 | } | |
567 | } | |
568 | if (flag & BLKID_FLTR_ONLYIN) { | |
569 | if (!has) | |
570 | blkid_bmp_set_item(fltr, i); | |
571 | } else if (flag & BLKID_FLTR_NOTIN) { | |
572 | if (has) | |
573 | blkid_bmp_set_item(fltr, i); | |
574 | } | |
575 | } | |
576 | ||
c62a6311 | 577 | DBG(LOWPROBE, ul_debug("%s: a new probing type-filter initialized", |
46a734fd KZ |
578 | chn->driver->name)); |
579 | /* blkid_probe_dump_filter(pr, chain); */ | |
580 | return 0; | |
581 | } | |
582 | ||
f12cd8d1 | 583 | static struct blkid_bufinfo *read_buffer(blkid_probe pr, uint64_t real_off, uint64_t len) |
2355dd6a KZ |
584 | { |
585 | ssize_t ret; | |
586 | struct blkid_bufinfo *bf = NULL; | |
587 | ||
588 | if (blkid_llseek(pr->fd, real_off, SEEK_SET) < 0) { | |
589 | errno = 0; | |
590 | return NULL; | |
591 | } | |
592 | ||
593 | /* someone trying to overflow some buffers? */ | |
594 | if (len > ULONG_MAX - sizeof(struct blkid_bufinfo)) { | |
595 | errno = ENOMEM; | |
596 | return NULL; | |
597 | } | |
598 | ||
599 | /* allocate info and space for data by one malloc call */ | |
600 | bf = calloc(1, sizeof(struct blkid_bufinfo) + len); | |
601 | if (!bf) { | |
602 | errno = ENOMEM; | |
603 | return NULL; | |
604 | } | |
605 | ||
606 | bf->data = ((unsigned char *) bf) + sizeof(struct blkid_bufinfo); | |
607 | bf->len = len; | |
608 | bf->off = real_off; | |
609 | INIT_LIST_HEAD(&bf->bufs); | |
610 | ||
fdbd7bb9 RM |
611 | DBG(LOWPROBE, ul_debug("\tread %p: off=%"PRIu64" len=%"PRIu64"", |
612 | bf->data, real_off, len)); | |
2355dd6a KZ |
613 | |
614 | ret = read(pr->fd, bf->data, len); | |
615 | if (ret != (ssize_t) len) { | |
616 | DBG(LOWPROBE, ul_debug("\tread failed: %m")); | |
617 | free(bf); | |
618 | if (ret >= 0) | |
619 | errno = 0; | |
620 | return NULL; | |
621 | } | |
622 | ||
623 | return bf; | |
624 | } | |
625 | ||
a674a0ab KZ |
626 | /* |
627 | * Note that @off is offset within probing area, the probing area is defined by | |
628 | * pr->off and pr->size. | |
629 | */ | |
f12cd8d1 | 630 | unsigned char *blkid_probe_get_buffer(blkid_probe pr, uint64_t off, uint64_t len) |
1ca17f91 | 631 | { |
15a8fb42 KZ |
632 | struct list_head *p; |
633 | struct blkid_bufinfo *bf = NULL; | |
f12cd8d1 | 634 | uint64_t real_off = pr->off + off; |
a674a0ab KZ |
635 | |
636 | /* | |
637 | DBG(BUFFER, ul_debug("\t>>>> off=%ju, real-off=%ju (probe <%ju..%ju>, len=%ju", | |
638 | off, real_off, pr->off, pr->off + pr->size, len)); | |
639 | */ | |
15a8fb42 | 640 | |
f12cd8d1 | 641 | if (pr->size == 0) { |
00749bc3 | 642 | errno = EINVAL; |
88923b08 | 643 | return NULL; |
00749bc3 | 644 | } |
88923b08 | 645 | |
a674a0ab KZ |
646 | if (len == 0 || pr->off + pr->size < real_off + len) { |
647 | DBG(BUFFER, ul_debug("\t ignore: request out of probing area")); | |
648 | errno = 0; | |
649 | return NULL; | |
650 | } | |
651 | ||
fd9f45e1 KZ |
652 | if (pr->parent && |
653 | pr->parent->devno == pr->devno && | |
ac8874ca KZ |
654 | pr->parent->off <= pr->off && |
655 | pr->parent->off + pr->parent->size >= pr->off + pr->size) { | |
fd9f45e1 KZ |
656 | /* |
657 | * This is a cloned prober and points to the same area as | |
ac8874ca KZ |
658 | * parent. Let's use parent's buffers. |
659 | * | |
660 | * Note that pr->off (and pr->parent->off) is always from the | |
a674a0ab | 661 | * begin of the device. |
fd9f45e1 | 662 | */ |
ac8874ca KZ |
663 | return blkid_probe_get_buffer(pr->parent, |
664 | pr->off + off - pr->parent->off, len); | |
665 | } | |
fd9f45e1 | 666 | |
a674a0ab | 667 | /* try buffers we already have in memmory */ |
15a8fb42 KZ |
668 | list_for_each(p, &pr->buffers) { |
669 | struct blkid_bufinfo *x = | |
670 | list_entry(p, struct blkid_bufinfo, bufs); | |
671 | ||
a674a0ab | 672 | if (real_off >= x->off && real_off + len <= x->off + x->len) { |
fdbd7bb9 | 673 | DBG(BUFFER, ul_debug("\treuse %p: off=%"PRIu64" len=%"PRIu64" (for off=%"PRIu64" len=%"PRIu64")", |
f12cd8d1 | 674 | x->data, x->off, x->len, real_off, len)); |
15a8fb42 KZ |
675 | bf = x; |
676 | break; | |
677 | } | |
1ca17f91 | 678 | } |
1ca17f91 | 679 | |
a674a0ab KZ |
680 | /* not found; read from disk */ |
681 | if (!bf) { | |
e04f3860 | 682 | bf = read_buffer(pr, real_off, len); |
a674a0ab | 683 | if (!bf) |
1ca17f91 | 684 | return NULL; |
1ca17f91 | 685 | |
15a8fb42 | 686 | list_add_tail(&bf->bufs, &pr->buffers); |
1ca17f91 | 687 | } |
15a8fb42 | 688 | |
a674a0ab KZ |
689 | assert(bf->off <= real_off); |
690 | assert(bf->off + bf->len >= real_off + len); | |
691 | ||
00749bc3 | 692 | errno = 0; |
a674a0ab | 693 | return real_off ? bf->data + (real_off - bf->off) : bf->data; |
1ca17f91 KZ |
694 | } |
695 | ||
15a8fb42 | 696 | static void blkid_probe_reset_buffer(blkid_probe pr) |
a0948ffe | 697 | { |
2355dd6a | 698 | uint64_t ct = 0, len = 0; |
15a8fb42 KZ |
699 | |
700 | if (!pr || list_empty(&pr->buffers)) | |
701 | return; | |
702 | ||
a674a0ab | 703 | DBG(BUFFER, ul_debug("reseting probing buffers pr=%p", pr)); |
15a8fb42 KZ |
704 | |
705 | while (!list_empty(&pr->buffers)) { | |
706 | struct blkid_bufinfo *bf = list_entry(pr->buffers.next, | |
707 | struct blkid_bufinfo, bufs); | |
2355dd6a KZ |
708 | ct++; |
709 | len += bf->len; | |
15a8fb42 | 710 | list_del(&bf->bufs); |
a674a0ab | 711 | |
fdbd7bb9 RM |
712 | DBG(BUFFER, ul_debug(" remove buffer: %p [off=%"PRIu64", len=%"PRIu64"]", |
713 | bf->data, bf->off, bf->len)); | |
15a8fb42 | 714 | free(bf); |
4884729a | 715 | } |
15a8fb42 | 716 | |
e04f3860 | 717 | DBG(LOWPROBE, ul_debug(" buffers summary: %"PRIu64" bytes by %"PRIu64" read() calls", |
2355dd6a | 718 | len, ct)); |
15a8fb42 KZ |
719 | |
720 | INIT_LIST_HEAD(&pr->buffers); | |
a0948ffe KZ |
721 | } |
722 | ||
af17d349 | 723 | static void blkid_probe_reset_values(blkid_probe pr) |
6c4a7811 | 724 | { |
af17d349 | 725 | if (!pr || list_empty(&pr->values)) |
6c4a7811 OO |
726 | return; |
727 | ||
728 | DBG(LOWPROBE, ul_debug("resetting results pr=%p", pr)); | |
729 | ||
af17d349 KZ |
730 | while (!list_empty(&pr->values)) { |
731 | struct blkid_prval *v = list_entry(pr->values.next, | |
6c4a7811 | 732 | struct blkid_prval, prvals); |
af17d349 | 733 | blkid_probe_free_value(v); |
6c4a7811 OO |
734 | } |
735 | ||
af17d349 | 736 | INIT_LIST_HEAD(&pr->values); |
6c4a7811 OO |
737 | } |
738 | ||
108013b4 KZ |
739 | /* |
740 | * Small devices need a special care. | |
741 | */ | |
742 | int blkid_probe_is_tiny(blkid_probe pr) | |
743 | { | |
a9eef56c | 744 | return pr && (pr->flags & BLKID_FL_TINY_DEV); |
108013b4 KZ |
745 | } |
746 | ||
55113b15 C |
747 | /* |
748 | * CDROMs may fail when probed for RAID (last sector problem) | |
749 | */ | |
750 | int blkid_probe_is_cdrom(blkid_probe pr) | |
751 | { | |
a9eef56c | 752 | return pr && (pr->flags & BLKID_FL_CDROM_DEV); |
55113b15 C |
753 | } |
754 | ||
bfebe74e KZ |
755 | static int is_sector_readable(int fd, uint64_t sector) |
756 | { | |
757 | char buf[512]; | |
758 | ssize_t sz; | |
759 | ||
760 | if (blkid_llseek(fd, sector * 512, SEEK_SET) < 0) | |
761 | goto failed; | |
762 | ||
763 | sz = read(fd, buf, sizeof(buf)); | |
764 | if (sz != (ssize_t) sizeof(buf)) | |
765 | goto failed; | |
766 | ||
767 | return 1; | |
768 | failed: | |
769 | DBG(LOWPROBE, ul_debug("CDROM: read sector %ju failed %m", sector)); | |
770 | errno = 0; | |
771 | return 0; | |
772 | } | |
773 | ||
774 | /* | |
a14cc9a5 KZ |
775 | * Issue #1: |
776 | * | |
777 | * On hybrid mutil-session media (audio+data) we get I/O errors almost | |
778 | * everywhere. The solution is to specify probing offset to the wanted | |
779 | * session. Udev uses this way when it calls libblkid (the proper data session | |
780 | * offset is based on ID_CDROM_MEDIA_SESSION_LAST_OFFSET from by udev cdrom_id | |
781 | * tool). | |
782 | * | |
783 | * Unfortunately, it means that blkid will be blind when executed without a | |
784 | * probing offset, to avoid this problem we use CDROMMULTISESSION ioctl to get | |
785 | * last session offset. This way also uses iso9660 fyslesystem kernel driver | |
786 | * when you mount mutil-session CD without a sesssion= mount option. | |
787 | * | |
788 | * Issue #2: | |
789 | * | |
790 | * Linux kernel reports (BLKGETSIZE) cdrom device size greater than area | |
791 | * readable by read(2). We have to reduce the probing area to avoid unwanted | |
792 | * I/O errors in probing functions. It seems that unreadable are always last 2 | |
793 | * or 3 CD blocks (CD block size is 2048 bytes, it means 12 in 512-byte | |
794 | * sectors). | |
bfebe74e KZ |
795 | */ |
796 | static void cdrom_size_correction(blkid_probe pr) | |
797 | { | |
a14cc9a5 KZ |
798 | uint64_t size, n, nsectors; |
799 | ||
800 | /* move offset */ | |
801 | #ifdef CDROMMULTISESSION | |
802 | if (pr->off == 0) { | |
803 | struct cdrom_multisession ms_info = { 0 }; | |
804 | int i; | |
805 | ||
806 | ms_info.addr_format = CDROM_LBA; | |
807 | i = ioctl(pr->fd, CDROMMULTISESSION, (unsigned long) &ms_info); | |
808 | if (i == 0 && ms_info.xa_flag) { | |
809 | DBG(LOWPROBE, ul_debug("CDROM: multisession last session start: %u (CD sectors)", ms_info.addr.lba)); | |
810 | ||
811 | pr->off = (uint64_t) ms_info.addr.lba * 2048; | |
812 | DBG(LOWPROBE, ul_debug("CDROM: moving probing offset from 0 to %ju", pr->off)); | |
813 | ||
814 | size = pr->size - pr->off; | |
815 | DBG(LOWPROBE, ul_debug("CDROM: reduce probing size from %ju to %ju", pr->size, size)); | |
816 | pr->size = size; | |
817 | } | |
818 | } | |
819 | #endif | |
820 | ||
821 | /* reduce size */ | |
822 | nsectors = pr->size >> 9; | |
bfebe74e KZ |
823 | |
824 | for (n = nsectors - 12; n < nsectors; n++) { | |
825 | if (!is_sector_readable(pr->fd, n)) | |
826 | goto failed; | |
827 | } | |
828 | ||
829 | DBG(LOWPROBE, ul_debug("CDROM: full size available")); | |
830 | return; | |
831 | failed: | |
832 | /* 'n' is the failed sector, reduce device size to n-1; */ | |
833 | DBG(LOWPROBE, ul_debug("CDROM: reduce size from %ju to %ju.", | |
834 | (uintmax_t) pr->size, | |
1bd62f72 | 835 | (uintmax_t) n << 9)); |
bfebe74e KZ |
836 | pr->size = n << 9; |
837 | } | |
838 | ||
52448df8 KZ |
839 | /** |
840 | * blkid_probe_set_device: | |
841 | * @pr: probe | |
842 | * @fd: device file descriptor | |
843 | * @off: begin of probing area | |
f38db0cf | 844 | * @size: size of probing area (zero means whole device/file) |
52448df8 KZ |
845 | * |
846 | * Assigns the device to probe control struct, resets internal buffers and | |
44ef90bc | 847 | * resets the current probing. |
51410fc6 | 848 | * |
52448df8 | 849 | * Returns: -1 in case of failure, or 0 on success. |
51410fc6 KZ |
850 | */ |
851 | int blkid_probe_set_device(blkid_probe pr, int fd, | |
852 | blkid_loff_t off, blkid_loff_t size) | |
a0948ffe | 853 | { |
90ec8d9c | 854 | struct stat sb; |
f12cd8d1 | 855 | uint64_t devsiz = 0; |
90ec8d9c | 856 | |
51410fc6 KZ |
857 | if (!pr) |
858 | return -1; | |
a0948ffe | 859 | |
51410fc6 | 860 | blkid_reset_probe(pr); |
ccdf9fda | 861 | blkid_probe_reset_buffer(pr); |
a0948ffe | 862 | |
a9eef56c | 863 | if ((pr->flags & BLKID_FL_PRIVATE_FD) && pr->fd >= 0) |
f38db0cf KZ |
864 | close(pr->fd); |
865 | ||
a9eef56c KZ |
866 | pr->flags &= ~BLKID_FL_PRIVATE_FD; |
867 | pr->flags &= ~BLKID_FL_TINY_DEV; | |
868 | pr->flags &= ~BLKID_FL_CDROM_DEV; | |
ccdf9fda | 869 | pr->prob_flags = 0; |
51410fc6 | 870 | pr->fd = fd; |
f12cd8d1 | 871 | pr->off = (uint64_t) off; |
bb6c6673 | 872 | pr->size = 0; |
52448df8 | 873 | pr->devno = 0; |
ccdf9fda | 874 | pr->disk_devno = 0; |
52448df8 KZ |
875 | pr->mode = 0; |
876 | pr->blkssz = 0; | |
ccdf9fda KZ |
877 | pr->wipe_off = 0; |
878 | pr->wipe_size = 0; | |
879 | pr->wipe_chain = NULL; | |
dc61d909 | 880 | |
a67bb3bf LT |
881 | #if defined(POSIX_FADV_RANDOM) && defined(HAVE_POSIX_FADVISE) |
882 | /* Disable read-ahead */ | |
883 | posix_fadvise(fd, 0, 0, POSIX_FADV_RANDOM); | |
884 | #endif | |
90ec8d9c KZ |
885 | if (fstat(fd, &sb)) |
886 | goto err; | |
887 | ||
a674a0ab | 888 | if (!S_ISBLK(sb.st_mode) && !S_ISCHR(sb.st_mode) && !S_ISREG(sb.st_mode)) { |
2355dd6a | 889 | errno = EINVAL; |
26eb5a59 | 890 | goto err; |
a674a0ab | 891 | } |
20e1c3dc | 892 | |
90ec8d9c KZ |
893 | pr->mode = sb.st_mode; |
894 | if (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode)) | |
895 | pr->devno = sb.st_rdev; | |
896 | ||
a674a0ab KZ |
897 | if (S_ISBLK(sb.st_mode)) { |
898 | if (blkdev_get_size(fd, (unsigned long long *) &devsiz)) { | |
899 | DBG(LOWPROBE, ul_debug("failed to get device size")); | |
108013b4 | 900 | goto err; |
a674a0ab KZ |
901 | } |
902 | } else if (S_ISCHR(sb.st_mode)) | |
903 | devsiz = 1; /* UBI devices are char... */ | |
904 | else if (S_ISREG(sb.st_mode)) | |
905 | devsiz = sb.st_size; /* regular file */ | |
906 | ||
b9710f1f | 907 | pr->size = size ? (uint64_t)size : devsiz; |
108013b4 | 908 | |
a674a0ab KZ |
909 | if (off && size == 0) |
910 | /* only offset without size specified */ | |
f12cd8d1 | 911 | pr->size -= (uint64_t) off; |
a674a0ab KZ |
912 | |
913 | if (pr->off + pr->size > devsiz) { | |
914 | DBG(LOWPROBE, ul_debug("area specified by offset and size is bigger than device")); | |
915 | errno = EINVAL; | |
916 | goto err; | |
bb6c6673 | 917 | } |
c1ba7962 | 918 | |
90ec8d9c | 919 | if (pr->size <= 1440 * 1024 && !S_ISCHR(sb.st_mode)) |
a9eef56c | 920 | pr->flags |= BLKID_FL_TINY_DEV; |
d0465c3c | 921 | |
39866431 | 922 | if (S_ISBLK(sb.st_mode) && sysfs_devno_is_lvm_private(sb.st_rdev)) { |
20e1c3dc KZ |
923 | DBG(LOWPROBE, ul_debug("ignore private LVM device")); |
924 | pr->flags |= BLKID_FL_NOSCAN_DEV; | |
925 | } | |
926 | ||
55113b15 | 927 | #ifdef CDROM_GET_CAPABILITY |
20e1c3dc | 928 | else if (S_ISBLK(sb.st_mode) && |
a3ab71cf KZ |
929 | !blkid_probe_is_tiny(pr) && |
930 | blkid_probe_is_wholedisk(pr) && | |
bfebe74e KZ |
931 | ioctl(fd, CDROM_GET_CAPABILITY, NULL) >= 0) { |
932 | ||
a9eef56c | 933 | pr->flags |= BLKID_FL_CDROM_DEV; |
bfebe74e KZ |
934 | cdrom_size_correction(pr); |
935 | } | |
55113b15 | 936 | #endif |
508e438b | 937 | |
fdbd7bb9 | 938 | DBG(LOWPROBE, ul_debug("ready for low-probing, offset=%"PRIu64", size=%"PRIu64"", |
508e438b | 939 | pr->off, pr->size)); |
c62a6311 | 940 | DBG(LOWPROBE, ul_debug("whole-disk: %s, regfile: %s", |
508e438b KZ |
941 | blkid_probe_is_wholedisk(pr) ?"YES" : "NO", |
942 | S_ISREG(pr->mode) ? "YES" : "NO")); | |
943 | ||
a0948ffe | 944 | return 0; |
0d17b1cf | 945 | err: |
c62a6311 | 946 | DBG(LOWPROBE, ul_debug("failed to prepare a device for low-probing")); |
0d17b1cf KZ |
947 | return -1; |
948 | ||
a0948ffe KZ |
949 | } |
950 | ||
f12cd8d1 | 951 | int blkid_probe_get_dimension(blkid_probe pr, uint64_t *off, uint64_t *size) |
f319b5ca KZ |
952 | { |
953 | if (!pr) | |
954 | return -1; | |
955 | ||
956 | *off = pr->off; | |
957 | *size = pr->size; | |
958 | return 0; | |
959 | } | |
960 | ||
f12cd8d1 | 961 | int blkid_probe_set_dimension(blkid_probe pr, uint64_t off, uint64_t size) |
f319b5ca KZ |
962 | { |
963 | if (!pr) | |
964 | return -1; | |
965 | ||
c62a6311 | 966 | DBG(LOWPROBE, ul_debug( |
fdbd7bb9 RM |
967 | "changing probing area pr=%p: size=%"PRIu64", off=%"PRIu64" " |
968 | "-to-> size=%"PRIu64", off=%"PRIu64"", | |
f12cd8d1 | 969 | pr, pr->size, pr->off, size, off)); |
f319b5ca KZ |
970 | |
971 | pr->off = off; | |
972 | pr->size = size; | |
a9eef56c | 973 | pr->flags &= ~BLKID_FL_TINY_DEV; |
88923b08 | 974 | |
f12cd8d1 | 975 | if (pr->size <= 1440ULL * 1024ULL && !S_ISCHR(pr->mode)) |
a9eef56c | 976 | pr->flags |= BLKID_FL_TINY_DEV; |
f319b5ca KZ |
977 | |
978 | blkid_probe_reset_buffer(pr); | |
979 | ||
980 | return 0; | |
981 | } | |
982 | ||
8d0ce083 | 983 | /* |
296d96e2 HR |
984 | * Check for matching magic value. |
985 | * Returns BLKID_PROBE_OK if found, BLKID_PROBE_NONE if not found | |
986 | * or no magic present, or negative value on error. | |
987 | */ | |
c76e710b | 988 | int blkid_probe_get_idmag(blkid_probe pr, const struct blkid_idinfo *id, |
f12cd8d1 | 989 | uint64_t *offset, const struct blkid_idmag **res) |
c76e710b KZ |
990 | { |
991 | const struct blkid_idmag *mag = NULL; | |
f12cd8d1 | 992 | uint64_t off = 0; |
c76e710b KZ |
993 | |
994 | if (id) | |
c03d12d8 | 995 | mag = &id->magics[0]; |
c76e710b KZ |
996 | if (res) |
997 | *res = NULL; | |
998 | ||
999 | /* try to detect by magic string */ | |
1000 | while(mag && mag->magic) { | |
1001 | unsigned char *buf; | |
1002 | ||
1003 | off = (mag->kboff + (mag->sboff >> 10)) << 10; | |
1004 | buf = blkid_probe_get_buffer(pr, off, 1024); | |
1005 | ||
296d96e2 HR |
1006 | if (!buf && errno) |
1007 | return -errno; | |
a674a0ab | 1008 | |
c76e710b KZ |
1009 | if (buf && !memcmp(mag->magic, |
1010 | buf + (mag->sboff & 0x3ff), mag->len)) { | |
a674a0ab | 1011 | |
c62a6311 | 1012 | DBG(LOWPROBE, ul_debug("\tmagic sboff=%u, kboff=%ld", |
c76e710b KZ |
1013 | mag->sboff, mag->kboff)); |
1014 | if (offset) | |
1015 | *offset = off + (mag->sboff & 0x3ff); | |
1016 | if (res) | |
1017 | *res = mag; | |
296d96e2 | 1018 | return BLKID_PROBE_OK; |
c76e710b KZ |
1019 | } |
1020 | mag++; | |
1021 | } | |
1022 | ||
c03d12d8 | 1023 | if (id && id->magics[0].magic) |
c76e710b | 1024 | /* magic string(s) defined, but not found */ |
296d96e2 | 1025 | return BLKID_PROBE_NONE; |
c76e710b | 1026 | |
296d96e2 | 1027 | return BLKID_PROBE_OK; |
c76e710b KZ |
1028 | } |
1029 | ||
c81e7008 KZ |
1030 | static inline void blkid_probe_start(blkid_probe pr) |
1031 | { | |
1032 | if (pr) { | |
c62a6311 | 1033 | DBG(LOWPROBE, ul_debug("%p: start probe", pr)); |
c81e7008 KZ |
1034 | pr->cur_chain = NULL; |
1035 | pr->prob_flags = 0; | |
8b7eae45 | 1036 | blkid_probe_set_wiper(pr, 0, 0); |
c81e7008 KZ |
1037 | } |
1038 | } | |
1039 | ||
1040 | static inline void blkid_probe_end(blkid_probe pr) | |
1041 | { | |
1042 | if (pr) { | |
c62a6311 | 1043 | DBG(LOWPROBE, ul_debug("%p: end probe", pr)); |
c81e7008 KZ |
1044 | pr->cur_chain = NULL; |
1045 | pr->prob_flags = 0; | |
8b7eae45 | 1046 | blkid_probe_set_wiper(pr, 0, 0); |
c81e7008 KZ |
1047 | } |
1048 | } | |
1049 | ||
0bffad47 KZ |
1050 | /** |
1051 | * blkid_do_probe: | |
1052 | * @pr: prober | |
1053 | * | |
1054 | * Calls probing functions in all enabled chains. The superblocks chain is | |
1055 | * enabled by default. The blkid_do_probe() stores result from only one | |
1056 | * probing function. It's necessary to call this routine in a loop to get | |
3b159691 | 1057 | * results from all probing functions in all chains. The probing is reset |
44ef90bc | 1058 | * by blkid_reset_probe() or by filter functions. |
a0fc685c | 1059 | * |
0bffad47 KZ |
1060 | * This is string-based NAME=value interface only. |
1061 | * | |
1062 | * <example> | |
1063 | * <title>basic case - use the first result only</title> | |
1064 | * <programlisting> | |
a0fc685c KZ |
1065 | * if (blkid_do_probe(pr) == 0) { |
1066 | * int nvals = blkid_probe_numof_values(pr); | |
1067 | * for (n = 0; n < nvals; n++) { | |
1068 | * if (blkid_probe_get_value(pr, n, &name, &data, &len) == 0) | |
1069 | * printf("%s = %s\n", name, data); | |
1070 | * } | |
1071 | * } | |
0bffad47 KZ |
1072 | * </programlisting> |
1073 | * </example> | |
a0fc685c | 1074 | * |
0bffad47 KZ |
1075 | * <example> |
1076 | * <title>advanced case - probe for all signatures</title> | |
1077 | * <programlisting> | |
a0fc685c KZ |
1078 | * while (blkid_do_probe(pr) == 0) { |
1079 | * int nvals = blkid_probe_numof_values(pr); | |
1080 | * ... | |
1081 | * } | |
0bffad47 KZ |
1082 | * </programlisting> |
1083 | * </example> | |
a0fc685c | 1084 | * |
0bffad47 | 1085 | * See also blkid_reset_probe(). |
a0fc685c | 1086 | * |
0bffad47 | 1087 | * Returns: 0 on success, 1 when probing is done and -1 in case of error. |
a0fc685c | 1088 | */ |
51410fc6 | 1089 | int blkid_do_probe(blkid_probe pr) |
a0948ffe | 1090 | { |
0bffad47 | 1091 | int rc = 1; |
a0948ffe | 1092 | |
0bffad47 | 1093 | if (!pr) |
51410fc6 | 1094 | return -1; |
a0948ffe | 1095 | |
20e1c3dc KZ |
1096 | if (pr->flags & BLKID_FL_NOSCAN_DEV) |
1097 | return 1; | |
1098 | ||
0bffad47 | 1099 | do { |
44ef90bc KZ |
1100 | struct blkid_chain *chn = pr->cur_chain; |
1101 | ||
c81e7008 KZ |
1102 | if (!chn) { |
1103 | blkid_probe_start(pr); | |
44ef90bc | 1104 | chn = pr->cur_chain = &pr->chains[0]; |
c81e7008 | 1105 | } |
44ef90bc KZ |
1106 | /* we go to the next chain only when the previous probing |
1107 | * result was nothing (rc == 1) and when the current chain is | |
1108 | * disabled or we are at end of the current chain (chain->idx + | |
046959cc CW |
1109 | * 1 == sizeof chain) or the current chain bailed out right at |
1110 | * the start (chain->idx == -1) | |
44ef90bc KZ |
1111 | */ |
1112 | else if (rc == 1 && (chn->enabled == FALSE || | |
c9f51c71 | 1113 | chn->idx + 1 == (int) chn->driver->nidinfos || |
046959cc | 1114 | chn->idx == -1)) { |
a0948ffe | 1115 | |
c9f51c71 | 1116 | size_t idx = chn->driver->id + 1; |
bd635f86 KZ |
1117 | |
1118 | if (idx < BLKID_NCHAINS) | |
44ef90bc | 1119 | chn = pr->cur_chain = &pr->chains[idx]; |
c81e7008 KZ |
1120 | else { |
1121 | blkid_probe_end(pr); | |
bd635f86 | 1122 | return 1; /* all chains already probed */ |
c81e7008 | 1123 | } |
bd635f86 | 1124 | } |
a0fc685c | 1125 | |
0bffad47 | 1126 | chn->binary = FALSE; /* for sure... */ |
6644688a | 1127 | |
c62a6311 | 1128 | DBG(LOWPROBE, ul_debug("chain probe %s %s (idx=%d)", |
0bffad47 | 1129 | chn->driver->name, |
44ef90bc KZ |
1130 | chn->enabled? "ENABLED" : "DISABLED", |
1131 | chn->idx)); | |
a0948ffe | 1132 | |
0bffad47 | 1133 | if (!chn->enabled) |
51410fc6 | 1134 | continue; |
a0948ffe | 1135 | |
0bffad47 KZ |
1136 | /* rc: -1 = error, 0 = success, 1 = no result */ |
1137 | rc = chn->driver->probe(pr, chn); | |
a0948ffe | 1138 | |
0bffad47 | 1139 | } while (rc == 1); |
a0948ffe | 1140 | |
0bffad47 KZ |
1141 | return rc; |
1142 | } | |
a0948ffe | 1143 | |
2b89be6c KZ |
1144 | /** |
1145 | * blkid_do_wipe: | |
1146 | * @pr: prober | |
1147 | * @dryrun: if TRUE then don't touch the device. | |
1148 | * | |
1149 | * This function erases the current signature detected by @pr. The @pr has to | |
476b508e | 1150 | * be open in O_RDWR mode, BLKID_SUBLKS_MAGIC or/and BLKID_PARTS_MAGIC flags |
c93c2030 KZ |
1151 | * has to be enabled (if you want to errase also superblock with broken check |
1152 | * sums then use BLKID_SUBLKS_BADCSUM too). | |
2b89be6c KZ |
1153 | * |
1154 | * After successful signature removing the @pr prober will be moved one step | |
1155 | * back and the next blkid_do_probe() call will again call previously called | |
1156 | * probing function. | |
1157 | * | |
1158 | * <example> | |
1159 | * <title>wipe all filesystems or raids from the device</title> | |
1160 | * <programlisting> | |
49a8f58e | 1161 | * fd = open(devname, O_RDWR|O_CLOEXEC); |
2b89be6c KZ |
1162 | * blkid_probe_set_device(pr, fd, 0, 0); |
1163 | * | |
1164 | * blkid_probe_enable_superblocks(pr, 1); | |
1165 | * blkid_probe_set_superblocks_flags(pr, BLKID_SUBLKS_MAGIC); | |
1166 | * | |
1167 | * while (blkid_do_probe(pr) == 0) | |
1168 | * blkid_do_wipe(pr, FALSE); | |
1169 | * </programlisting> | |
1170 | * </example> | |
1171 | * | |
cd0fe5c1 KZ |
1172 | * See also blkid_probe_step_back() if you cannot use this build-in wipe |
1173 | * function, but you want to use libblkid probing as a source for wiping. | |
1174 | * | |
1175 | * Returns: 0 on success, and -1 in case of error. | |
2b89be6c KZ |
1176 | */ |
1177 | int blkid_do_wipe(blkid_probe pr, int dryrun) | |
1178 | { | |
44765fdd | 1179 | const char *off = NULL; |
2b89be6c | 1180 | size_t len = 0; |
f12cd8d1 | 1181 | uint64_t offset, l; |
2b89be6c | 1182 | char buf[BUFSIZ]; |
f8054232 | 1183 | int fd, rc = 0; |
2b89be6c KZ |
1184 | struct blkid_chain *chn; |
1185 | ||
1186 | if (!pr) | |
1187 | return -1; | |
1188 | ||
1189 | chn = pr->cur_chain; | |
1190 | if (!chn) | |
1191 | return -1; | |
1192 | ||
44765fdd KZ |
1193 | switch (chn->driver->id) { |
1194 | case BLKID_CHAIN_SUBLKS: | |
1195 | rc = blkid_probe_lookup_value(pr, "SBMAGIC_OFFSET", &off, NULL); | |
1196 | if (!rc) | |
1197 | rc = blkid_probe_lookup_value(pr, "SBMAGIC", NULL, &len); | |
1198 | break; | |
1199 | case BLKID_CHAIN_PARTS: | |
1200 | rc = blkid_probe_lookup_value(pr, "PTMAGIC_OFFSET", &off, NULL); | |
1201 | if (!rc) | |
1202 | rc = blkid_probe_lookup_value(pr, "PTMAGIC", NULL, &len); | |
1203 | break; | |
1204 | default: | |
1205 | return 0; | |
1206 | } | |
1207 | ||
1208 | if (rc || len == 0 || off == NULL) | |
2b89be6c KZ |
1209 | return 0; |
1210 | ||
445e6b1e | 1211 | offset = strtoumax(off, NULL, 10) + pr->off; |
2b89be6c KZ |
1212 | fd = blkid_probe_get_fd(pr); |
1213 | if (fd < 0) | |
1214 | return -1; | |
1215 | ||
1216 | if (len > sizeof(buf)) | |
1217 | len = sizeof(buf); | |
1218 | ||
c62a6311 | 1219 | DBG(LOWPROBE, ul_debug( |
fdbd7bb9 | 1220 | "do_wipe [offset=0x%"PRIx64" (%"PRIu64"), len=%zu, chain=%s, idx=%d, dryrun=%s]\n", |
f12cd8d1 | 1221 | offset, offset, len, chn->driver->name, chn->idx, dryrun ? "yes" : "not")); |
2b89be6c | 1222 | |
f12cd8d1 | 1223 | l = blkid_llseek(fd, offset, SEEK_SET); |
b9710f1f | 1224 | if ((blkid_loff_t)l == (off_t) -1) |
2b89be6c KZ |
1225 | return -1; |
1226 | ||
1227 | memset(buf, 0, len); | |
1228 | ||
1229 | if (!dryrun && len) { | |
1230 | if (write_all(fd, buf, len)) | |
1231 | return -1; | |
1232 | fsync(fd); | |
cd0fe5c1 KZ |
1233 | return blkid_probe_step_back(pr); |
1234 | } | |
2b89be6c | 1235 | |
cd0fe5c1 KZ |
1236 | return 0; |
1237 | } | |
2b89be6c | 1238 | |
cd0fe5c1 | 1239 | /** |
c0055e2a | 1240 | * blkid_probe_step_back: |
cd0fe5c1 KZ |
1241 | * @pr: prober |
1242 | * | |
1243 | * This function move pointer to the probing chain one step back -- it means | |
1244 | * that the previously used probing function will be called again in the next | |
1245 | * blkid_do_probe() call. | |
1246 | * | |
1247 | * This is necessary for example if you erase or modify on-disk superblock | |
1248 | * according to the current libblkid probing result. | |
1249 | * | |
1250 | * <example> | |
1251 | * <title>wipe all superblock, but use libblkid only for probing</title> | |
1252 | * <programlisting> | |
1253 | * pr = blkid_new_probe_from_filename(devname); | |
1254 | * | |
1255 | * blkid_probe_enable_superblocks(pr, 1); | |
1256 | * blkid_probe_set_superblocks_flags(pr, BLKID_SUBLKS_MAGIC); | |
1257 | * | |
2bb7a706 KZ |
1258 | * blkid_probe_enable_partitions(pr, 1); |
1259 | * blkid_probe_set_partitions_flags(pr, BLKID_PARTS_MAGIC); | |
1260 | * | |
cd0fe5c1 KZ |
1261 | * while (blkid_do_probe(pr) == 0) { |
1262 | * const char *ostr = NULL; | |
1263 | * size_t len = 0; | |
1264 | * | |
1265 | * // superblocks | |
1266 | * if (blkid_probe_lookup_value(pr, "SBMAGIC_OFFSET", &ostr, NULL) == 0) | |
1267 | * blkid_probe_lookup_value(pr, "SBMAGIC", NULL, &len); | |
1268 | * | |
1269 | * // partition tables | |
1270 | * if (len == 0 && blkid_probe_lookup_value(pr, "PTMAGIC_OFFSET", &ostr, NULL) == 0) | |
1271 | * blkid_probe_lookup_value(pr, "PTMAGIC", NULL, &len); | |
1272 | * | |
1273 | * if (!len || !str) | |
1274 | * continue; | |
1275 | * | |
1276 | * // convert ostr to the real offset by off = strtoll(ostr, NULL, 10); | |
1277 | * // use your stuff to errase @len bytes at the @off | |
1278 | * .... | |
1279 | * | |
1280 | * // retry the last probing to check for backup superblocks ..etc. | |
1281 | * blkid_probe_step_back(pr); | |
1282 | * } | |
1283 | * </programlisting> | |
1284 | * </example> | |
1285 | * | |
1286 | * Returns: 0 on success, and -1 in case of error. | |
1287 | */ | |
1288 | int blkid_probe_step_back(blkid_probe pr) | |
1289 | { | |
1290 | struct blkid_chain *chn; | |
1291 | ||
1292 | if (!pr) | |
1293 | return -1; | |
1294 | ||
1295 | chn = pr->cur_chain; | |
1296 | if (!chn) | |
1297 | return -1; | |
1298 | ||
1299 | blkid_probe_reset_buffer(pr); | |
1300 | ||
1301 | if (chn->idx >= 0) { | |
1302 | chn->idx--; | |
c62a6311 | 1303 | DBG(LOWPROBE, ul_debug("step back: moving %s chain index to %d", |
cd0fe5c1 KZ |
1304 | chn->driver->name, |
1305 | chn->idx)); | |
2b89be6c | 1306 | } |
cd0fe5c1 KZ |
1307 | |
1308 | if (chn->idx == -1) { | |
1309 | /* blkid_do_probe() goes to the next chain if the index | |
1310 | * of the current chain is -1, so we have to set the | |
1311 | * chain pointer to the previous chain. | |
1312 | */ | |
1313 | size_t idx = chn->driver->id > 0 ? chn->driver->id - 1 : 0; | |
1314 | ||
c62a6311 | 1315 | DBG(LOWPROBE, ul_debug("step back: moving to previous chain")); |
cd0fe5c1 KZ |
1316 | |
1317 | if (idx > 0) | |
1318 | pr->cur_chain = &pr->chains[idx]; | |
1319 | else if (idx == 0) | |
1320 | pr->cur_chain = NULL; | |
1321 | } | |
1322 | ||
2b89be6c KZ |
1323 | return 0; |
1324 | } | |
1325 | ||
0bffad47 KZ |
1326 | /** |
1327 | * blkid_do_safeprobe: | |
1328 | * @pr: prober | |
1329 | * | |
1330 | * This function gathers probing results from all enabled chains and checks | |
1331 | * for ambivalent results (e.g. more filesystems on the device). | |
1332 | * | |
1333 | * This is string-based NAME=value interface only. | |
1334 | * | |
1335 | * Note about suberblocks chain -- the function does not check for filesystems | |
1336 | * when a RAID signature is detected. The function also does not check for | |
c81e7008 KZ |
1337 | * collision between RAIDs. The first detected RAID is returned. The function |
1338 | * checks for collision between partition table and RAID signature -- it's | |
1339 | * recommended to enable partitions chain together with superblocks chain. | |
0bffad47 KZ |
1340 | * |
1341 | * Returns: 0 on success, 1 if nothing is detected, -2 if ambivalen result is | |
1342 | * detected and -1 on case of error. | |
1343 | */ | |
1344 | int blkid_do_safeprobe(blkid_probe pr) | |
1345 | { | |
1346 | int i, count = 0, rc = 0; | |
a0948ffe | 1347 | |
0bffad47 KZ |
1348 | if (!pr) |
1349 | return -1; | |
20e1c3dc KZ |
1350 | if (pr->flags & BLKID_FL_NOSCAN_DEV) |
1351 | return 1; | |
a0948ffe | 1352 | |
c81e7008 KZ |
1353 | blkid_probe_start(pr); |
1354 | ||
0bffad47 KZ |
1355 | for (i = 0; i < BLKID_NCHAINS; i++) { |
1356 | struct blkid_chain *chn; | |
a0948ffe | 1357 | |
0bffad47 KZ |
1358 | chn = pr->cur_chain = &pr->chains[i]; |
1359 | chn->binary = FALSE; /* for sure... */ | |
a0948ffe | 1360 | |
c62a6311 | 1361 | DBG(LOWPROBE, ul_debug("chain safeprobe %s %s", |
0bffad47 KZ |
1362 | chn->driver->name, |
1363 | chn->enabled? "ENABLED" : "DISABLED")); | |
1364 | ||
1365 | if (!chn->enabled) | |
1366 | continue; | |
1367 | ||
9e0f7bda | 1368 | blkid_probe_chain_reset_position(chn); |
0bffad47 | 1369 | |
0bffad47 | 1370 | rc = chn->driver->safeprobe(pr, chn); |
9e0f7bda KZ |
1371 | |
1372 | blkid_probe_chain_reset_position(chn); | |
1373 | ||
1374 | /* rc: -2 ambivalent, -1 = error, 0 = success, 1 = no result */ | |
0bffad47 KZ |
1375 | if (rc < 0) |
1376 | goto done; /* error */ | |
1377 | if (rc == 0) | |
1378 | count++; /* success */ | |
51410fc6 | 1379 | } |
0bffad47 KZ |
1380 | |
1381 | done: | |
c81e7008 | 1382 | blkid_probe_end(pr); |
0bffad47 KZ |
1383 | if (rc < 0) |
1384 | return rc; | |
1385 | return count ? 0 : 1; | |
a0948ffe KZ |
1386 | } |
1387 | ||
0bffad47 KZ |
1388 | /** |
1389 | * blkid_do_fullprobe: | |
1390 | * @pr: prober | |
1391 | * | |
1392 | * This function gathers probing results from all enabled chains. Same as | |
fd7c9e35 | 1393 | * blkid_do_safeprobe() but does not check for collision between probing |
0bffad47 KZ |
1394 | * result. |
1395 | * | |
1396 | * This is string-based NAME=value interface only. | |
7103157c | 1397 | * |
0bffad47 | 1398 | * Returns: 0 on success, 1 if nothing is detected or -1 on case of error. |
a2f01a1c | 1399 | */ |
0bffad47 | 1400 | int blkid_do_fullprobe(blkid_probe pr) |
a2f01a1c | 1401 | { |
0bffad47 | 1402 | int i, count = 0, rc = 0; |
7103157c | 1403 | |
0bffad47 KZ |
1404 | if (!pr) |
1405 | return -1; | |
20e1c3dc KZ |
1406 | if (pr->flags & BLKID_FL_NOSCAN_DEV) |
1407 | return 1; | |
a2f01a1c | 1408 | |
c81e7008 KZ |
1409 | blkid_probe_start(pr); |
1410 | ||
0bffad47 | 1411 | for (i = 0; i < BLKID_NCHAINS; i++) { |
0bffad47 | 1412 | struct blkid_chain *chn; |
a2f01a1c | 1413 | |
0bffad47 KZ |
1414 | chn = pr->cur_chain = &pr->chains[i]; |
1415 | chn->binary = FALSE; /* for sure... */ | |
1416 | ||
c62a6311 | 1417 | DBG(LOWPROBE, ul_debug("chain fullprobe %s: %s", |
0bffad47 KZ |
1418 | chn->driver->name, |
1419 | chn->enabled? "ENABLED" : "DISABLED")); | |
1420 | ||
1421 | if (!chn->enabled) | |
1422 | continue; | |
1423 | ||
9e0f7bda | 1424 | blkid_probe_chain_reset_position(chn); |
0bffad47 | 1425 | |
0bffad47 | 1426 | rc = chn->driver->probe(pr, chn); |
9e0f7bda KZ |
1427 | |
1428 | blkid_probe_chain_reset_position(chn); | |
1429 | ||
1430 | /* rc: -1 = error, 0 = success, 1 = no result */ | |
0bffad47 KZ |
1431 | if (rc < 0) |
1432 | goto done; /* error */ | |
1433 | if (rc == 0) | |
1434 | count++; /* success */ | |
1435 | } | |
1436 | ||
1437 | done: | |
c81e7008 | 1438 | blkid_probe_end(pr); |
0bffad47 KZ |
1439 | if (rc < 0) |
1440 | return rc; | |
1441 | return count ? 0 : 1; | |
a2f01a1c KZ |
1442 | } |
1443 | ||
ce011388 KZ |
1444 | /* same sa blkid_probe_get_buffer() but works with 512-sectors */ |
1445 | unsigned char *blkid_probe_get_sector(blkid_probe pr, unsigned int sector) | |
1446 | { | |
1447 | return pr ? blkid_probe_get_buffer(pr, | |
f12cd8d1 | 1448 | ((uint64_t) sector) << 9, 0x200) : NULL; |
ce011388 KZ |
1449 | } |
1450 | ||
9bdf6885 | 1451 | struct blkid_prval *blkid_probe_assign_value( |
51410fc6 | 1452 | blkid_probe pr, const char *name) |
a0948ffe | 1453 | { |
51410fc6 | 1454 | struct blkid_prval *v; |
51410fc6 KZ |
1455 | if (!name) |
1456 | return NULL; | |
6c4a7811 OO |
1457 | |
1458 | v = blkid_probe_new_value(); | |
1459 | if (!v) | |
51410fc6 | 1460 | return NULL; |
a0948ffe | 1461 | |
51410fc6 | 1462 | v->name = name; |
9bdf6885 | 1463 | v->chain = pr->cur_chain; |
af17d349 | 1464 | list_add_tail(&v->prvals, &pr->values); |
6644688a | 1465 | |
c62a6311 | 1466 | DBG(LOWPROBE, ul_debug("assigning %s [%s]", name, v->chain->driver->name)); |
51410fc6 | 1467 | return v; |
a0948ffe KZ |
1468 | } |
1469 | ||
6c4a7811 | 1470 | static struct blkid_prval *blkid_probe_new_value(void) |
cdd5bada | 1471 | { |
6c4a7811 OO |
1472 | struct blkid_prval *v = calloc(1, sizeof(struct blkid_prval)); |
1473 | if (!v) | |
1474 | return NULL; | |
cdd5bada | 1475 | |
6c4a7811 | 1476 | INIT_LIST_HEAD(&v->prvals); |
cdd5bada | 1477 | |
6c4a7811 OO |
1478 | return v; |
1479 | } | |
cdd5bada | 1480 | |
6c4a7811 | 1481 | /* Note that value data is always terminated by zero to keep things robust, |
3fd1f771 RM |
1482 | * this extra zero is not count to the value length. It's caller responsibility |
1483 | * to set proper value length (for strings we count terminator to the length, | |
6c4a7811 OO |
1484 | * for binary data it's without terminator). |
1485 | */ | |
1486 | int blkid_probe_value_set_data(struct blkid_prval *v, | |
1487 | unsigned char *data, size_t len) | |
1488 | { | |
1489 | v->data = calloc(1, len + 1); /* always terminate by \0 */ | |
cdd5bada | 1490 | |
6c4a7811 OO |
1491 | if (!v->data) |
1492 | return -ENOMEM; | |
1493 | memcpy(v->data, data, len); | |
1494 | v->len = len; | |
cdd5bada | 1495 | return 0; |
cdd5bada KZ |
1496 | } |
1497 | ||
51410fc6 KZ |
1498 | int blkid_probe_set_value(blkid_probe pr, const char *name, |
1499 | unsigned char *data, size_t len) | |
a0948ffe | 1500 | { |
51410fc6 | 1501 | struct blkid_prval *v; |
a0948ffe | 1502 | |
51410fc6 KZ |
1503 | v = blkid_probe_assign_value(pr, name); |
1504 | if (!v) | |
1505 | return -1; | |
a0948ffe | 1506 | |
6c4a7811 | 1507 | return blkid_probe_value_set_data(v, data, len); |
a0948ffe KZ |
1508 | } |
1509 | ||
51410fc6 KZ |
1510 | int blkid_probe_vsprintf_value(blkid_probe pr, const char *name, |
1511 | const char *fmt, va_list ap) | |
a0948ffe | 1512 | { |
51410fc6 | 1513 | struct blkid_prval *v; |
a23facd6 | 1514 | ssize_t len; |
a0948ffe | 1515 | |
51410fc6 KZ |
1516 | v = blkid_probe_assign_value(pr, name); |
1517 | if (!v) | |
6c4a7811 | 1518 | return -ENOMEM; |
a0948ffe | 1519 | |
6c4a7811 | 1520 | len = vasprintf((char **) &v->data, fmt, ap); |
a0948ffe | 1521 | |
6c4a7811 | 1522 | if (len <= 0) { |
af17d349 | 1523 | blkid_probe_free_value(v); |
6c4a7811 | 1524 | return len == 0 ? -EINVAL : -ENOMEM; |
a0948ffe | 1525 | } |
51410fc6 | 1526 | v->len = len + 1; |
a0948ffe KZ |
1527 | return 0; |
1528 | } | |
1529 | ||
cc33d693 KZ |
1530 | int blkid_probe_sprintf_value(blkid_probe pr, const char *name, |
1531 | const char *fmt, ...) | |
1532 | { | |
1533 | int rc; | |
1534 | va_list ap; | |
1535 | ||
1536 | va_start(ap, fmt); | |
1537 | rc = blkid_probe_vsprintf_value(pr, name, fmt, ap); | |
1538 | va_end(ap); | |
1539 | ||
1540 | return rc; | |
1541 | } | |
1542 | ||
f12cd8d1 | 1543 | int blkid_probe_set_magic(blkid_probe pr, uint64_t offset, |
3c83b3b2 KZ |
1544 | size_t len, unsigned char *magic) |
1545 | { | |
1546 | int rc = 0; | |
1547 | struct blkid_chain *chn = blkid_probe_get_chain(pr); | |
1548 | ||
1549 | if (!chn || !magic || !len || chn->binary) | |
1550 | return 0; | |
1551 | ||
1552 | switch (chn->driver->id) { | |
1553 | case BLKID_CHAIN_SUBLKS: | |
1554 | if (!(chn->flags & BLKID_SUBLKS_MAGIC)) | |
1555 | return 0; | |
1556 | rc = blkid_probe_set_value(pr, "SBMAGIC", magic, len); | |
1557 | if (!rc) | |
1558 | rc = blkid_probe_sprintf_value(pr, | |
44064b3c | 1559 | "SBMAGIC_OFFSET", "%llu", (unsigned long long)offset); |
3c83b3b2 KZ |
1560 | break; |
1561 | case BLKID_CHAIN_PARTS: | |
1562 | if (!(chn->flags & BLKID_PARTS_MAGIC)) | |
1563 | return 0; | |
1564 | rc = blkid_probe_set_value(pr, "PTMAGIC", magic, len); | |
1565 | if (!rc) | |
1566 | rc = blkid_probe_sprintf_value(pr, | |
44064b3c | 1567 | "PTMAGIC_OFFSET", "%llu", (unsigned long long)offset); |
3c83b3b2 KZ |
1568 | break; |
1569 | default: | |
1570 | break; | |
1571 | } | |
1572 | ||
1573 | return rc; | |
1574 | } | |
1575 | ||
c89a1def KZ |
1576 | int blkid_probe_verify_csum(blkid_probe pr, uint64_t csum, uint64_t expected) |
1577 | { | |
1578 | if (csum != expected) { | |
02f3c12a GP |
1579 | struct blkid_chain *chn = blkid_probe_get_chain(pr); |
1580 | ||
c62a6311 | 1581 | DBG(LOWPROBE, ul_debug( |
c89a1def | 1582 | "incorrect checksum for type %s," |
fdbd7bb9 | 1583 | " got %"PRIX64", expected %"PRIX64"", |
c89a1def KZ |
1584 | blkid_probe_get_probername(pr), |
1585 | csum, expected)); | |
d88803a4 KZ |
1586 | /* |
1587 | * Accept bad checksum if BLKID_SUBLKS_BADCSUM flags is set | |
1588 | */ | |
1589 | if (chn->driver->id == BLKID_CHAIN_SUBLKS | |
1590 | && (chn->flags & BLKID_SUBLKS_BADCSUM)) { | |
1591 | blkid_probe_set_value(pr, "SBBADCSUM", (unsigned char *) "1", 2); | |
1592 | goto accept; | |
1593 | } | |
1594 | return 0; /* bad checksum */ | |
c89a1def KZ |
1595 | } |
1596 | ||
d88803a4 KZ |
1597 | accept: |
1598 | return 1; | |
c89a1def KZ |
1599 | } |
1600 | ||
b3ee97a3 KZ |
1601 | /** |
1602 | * blkid_probe_get_devno: | |
1603 | * @pr: probe | |
1604 | * | |
3b159691 | 1605 | * Returns: block device number, or 0 for regular files. |
b3ee97a3 KZ |
1606 | */ |
1607 | dev_t blkid_probe_get_devno(blkid_probe pr) | |
1608 | { | |
b3ee97a3 KZ |
1609 | return pr->devno; |
1610 | } | |
1611 | ||
601fb1c1 KZ |
1612 | /** |
1613 | * blkid_probe_get_wholedisk_devno: | |
1614 | * @pr: probe | |
1615 | * | |
3b159691 | 1616 | * Returns: device number of the wholedisk, or 0 for regular files. |
601fb1c1 KZ |
1617 | */ |
1618 | dev_t blkid_probe_get_wholedisk_devno(blkid_probe pr) | |
1619 | { | |
1620 | if (!pr->disk_devno) { | |
1621 | dev_t devno, disk_devno = 0; | |
1622 | ||
1623 | devno = blkid_probe_get_devno(pr); | |
1624 | if (!devno) | |
1625 | return 0; | |
1626 | ||
2bf68c93 | 1627 | if (blkid_devno_to_wholedisk(devno, NULL, 0, &disk_devno) == 0) |
601fb1c1 KZ |
1628 | pr->disk_devno = disk_devno; |
1629 | } | |
1630 | return pr->disk_devno; | |
1631 | } | |
1632 | ||
1633 | /** | |
1634 | * blkid_probe_is_wholedisk: | |
1635 | * @pr: probe | |
1636 | * | |
1637 | * Returns: 1 if the device is whole-disk or 0. | |
1638 | */ | |
1639 | int blkid_probe_is_wholedisk(blkid_probe pr) | |
1640 | { | |
1641 | dev_t devno, disk_devno; | |
1642 | ||
1643 | devno = blkid_probe_get_devno(pr); | |
1644 | if (!devno) | |
1645 | return 0; | |
1646 | ||
1647 | disk_devno = blkid_probe_get_wholedisk_devno(pr); | |
1648 | if (!disk_devno) | |
1649 | return 0; | |
1650 | ||
1651 | return devno == disk_devno; | |
1652 | } | |
1653 | ||
fd9f45e1 KZ |
1654 | blkid_probe blkid_probe_get_wholedisk_probe(blkid_probe pr) |
1655 | { | |
1656 | dev_t disk; | |
1657 | ||
1658 | if (blkid_probe_is_wholedisk(pr)) | |
1659 | return NULL; /* this is not partition */ | |
1660 | ||
1661 | if (pr->parent) | |
1662 | /* this is cloned blkid_probe, use parent's stuff */ | |
1663 | return blkid_probe_get_wholedisk_probe(pr->parent); | |
1664 | ||
1665 | disk = blkid_probe_get_wholedisk_devno(pr); | |
1666 | ||
1667 | if (pr->disk_probe && pr->disk_probe->devno != disk) { | |
1668 | /* we have disk prober, but for another disk... close it */ | |
1669 | blkid_free_probe(pr->disk_probe); | |
1670 | pr->disk_probe = NULL; | |
1671 | } | |
1672 | ||
1673 | if (!pr->disk_probe) { | |
1674 | /* Open a new disk prober */ | |
1675 | char *disk_path = blkid_devno_to_devname(disk); | |
1676 | ||
1677 | if (!disk_path) | |
1678 | return NULL; | |
1679 | ||
c62a6311 | 1680 | DBG(LOWPROBE, ul_debug("allocate a wholedisk probe")); |
fd9f45e1 KZ |
1681 | |
1682 | pr->disk_probe = blkid_new_probe_from_filename(disk_path); | |
7eac65fc KZ |
1683 | |
1684 | free(disk_path); | |
1685 | ||
fd9f45e1 KZ |
1686 | if (!pr->disk_probe) |
1687 | return NULL; /* ENOMEM? */ | |
1688 | } | |
1689 | ||
1690 | return pr->disk_probe; | |
1691 | } | |
1692 | ||
b3ee97a3 KZ |
1693 | /** |
1694 | * blkid_probe_get_size: | |
1695 | * @pr: probe | |
1696 | * | |
30696241 KZ |
1697 | * This function returns size of probing area as defined by blkid_probe_set_device(). |
1698 | * If the size of the probing area is unrestricted then this function returns | |
1699 | * the real size of device. See also blkid_get_dev_size(). | |
1700 | * | |
1701 | * Returns: size in bytes or -1 in case of error. | |
b3ee97a3 KZ |
1702 | */ |
1703 | blkid_loff_t blkid_probe_get_size(blkid_probe pr) | |
1704 | { | |
f12cd8d1 | 1705 | return pr ? (blkid_loff_t) pr->size : -1; |
b3ee97a3 KZ |
1706 | } |
1707 | ||
56e961e2 KZ |
1708 | /** |
1709 | * blkid_probe_get_offset: | |
1710 | * @pr: probe | |
1711 | * | |
1712 | * This function returns offset of probing area as defined by blkid_probe_set_device(). | |
1713 | * | |
1714 | * Returns: offset in bytes or -1 in case of error. | |
1715 | */ | |
1716 | blkid_loff_t blkid_probe_get_offset(blkid_probe pr) | |
1717 | { | |
f12cd8d1 | 1718 | return pr ? (blkid_loff_t) pr->off : -1; |
56e961e2 KZ |
1719 | } |
1720 | ||
1721 | /** | |
1722 | * blkid_probe_get_fd: | |
1723 | * @pr: probe | |
1724 | * | |
e3436956 | 1725 | * Returns: file descriptor for assigned device/file or -1 in case of error. |
56e961e2 KZ |
1726 | */ |
1727 | int blkid_probe_get_fd(blkid_probe pr) | |
1728 | { | |
1729 | return pr ? pr->fd : -1; | |
1730 | } | |
1731 | ||
b3ee97a3 KZ |
1732 | /** |
1733 | * blkid_probe_get_sectorsize: | |
90ec8d9c | 1734 | * @pr: probe or NULL (for NULL returns 512) |
b3ee97a3 | 1735 | * |
2a1dfbad | 1736 | * Returns: block device logical sector size (BLKSSZGET ioctl, default 512). |
b3ee97a3 KZ |
1737 | */ |
1738 | unsigned int blkid_probe_get_sectorsize(blkid_probe pr) | |
1739 | { | |
1740 | if (!pr) | |
1741 | return DEFAULT_SECTOR_SIZE; /*... and good luck! */ | |
90ec8d9c | 1742 | |
b3ee97a3 KZ |
1743 | if (pr->blkssz) |
1744 | return pr->blkssz; | |
b3ee97a3 | 1745 | |
90ec8d9c KZ |
1746 | if (S_ISBLK(pr->mode) && |
1747 | blkdev_get_sector_size(pr->fd, (int *) &pr->blkssz) == 0) | |
1748 | return pr->blkssz; | |
b3ee97a3 | 1749 | |
b3ee97a3 KZ |
1750 | pr->blkssz = DEFAULT_SECTOR_SIZE; |
1751 | return pr->blkssz; | |
1752 | } | |
1753 | ||
e8ae4947 DB |
1754 | /** |
1755 | * blkid_probe_get_sectors: | |
1756 | * @pr: probe | |
1757 | * | |
1758 | * Returns: 512-byte sector count or -1 in case of error. | |
1759 | */ | |
1760 | blkid_loff_t blkid_probe_get_sectors(blkid_probe pr) | |
1761 | { | |
f12cd8d1 | 1762 | return pr ? (blkid_loff_t) (pr->size >> 9) : -1; |
e8ae4947 DB |
1763 | } |
1764 | ||
4d72b337 KZ |
1765 | /** |
1766 | * blkid_probe_numof_values: | |
1767 | * @pr: probe | |
1768 | * | |
1769 | * Returns: number of values in probing result or -1 in case of error. | |
1770 | */ | |
1771 | int blkid_probe_numof_values(blkid_probe pr) | |
1772 | { | |
6c4a7811 OO |
1773 | int i = 0; |
1774 | struct list_head *p; | |
4d72b337 KZ |
1775 | if (!pr) |
1776 | return -1; | |
6c4a7811 | 1777 | |
af17d349 | 1778 | list_for_each(p, &pr->values) |
6c4a7811 OO |
1779 | ++i; |
1780 | return i; | |
4d72b337 KZ |
1781 | } |
1782 | ||
81f73792 KZ |
1783 | /** |
1784 | * blkid_probe_get_value: | |
1785 | * @pr: probe | |
1786 | * @num: wanted value in range 0..N, where N is blkid_probe_numof_values() - 1 | |
1787 | * @name: pointer to return value name or NULL | |
1788 | * @data: pointer to return value data or NULL | |
1789 | * @len: pointer to return value length or NULL | |
1790 | * | |
c2dbd49b KZ |
1791 | * Note, the @len returns length of the @data, including the terminating |
1792 | * '\0' character. | |
1793 | * | |
81f73792 KZ |
1794 | * Returns: 0 on success, or -1 in case of error. |
1795 | */ | |
51410fc6 | 1796 | int blkid_probe_get_value(blkid_probe pr, int num, const char **name, |
6d042d0d | 1797 | const char **data, size_t *len) |
a0948ffe | 1798 | { |
81f73792 | 1799 | struct blkid_prval *v = __blkid_probe_get_value(pr, num); |
a0948ffe | 1800 | |
81f73792 | 1801 | if (!v) |
51410fc6 | 1802 | return -1; |
51410fc6 KZ |
1803 | if (name) |
1804 | *name = v->name; | |
1805 | if (data) | |
6d042d0d | 1806 | *data = (char *) v->data; |
51410fc6 KZ |
1807 | if (len) |
1808 | *len = v->len; | |
6644688a | 1809 | |
c62a6311 | 1810 | DBG(LOWPROBE, ul_debug("returning %s value", v->name)); |
a0948ffe KZ |
1811 | return 0; |
1812 | } | |
a0948ffe | 1813 | |
81f73792 KZ |
1814 | /** |
1815 | * blkid_probe_lookup_value: | |
1816 | * @pr: probe | |
1817 | * @name: name of value | |
1818 | * @data: pointer to return value data or NULL | |
1819 | * @len: pointer to return value length or NULL | |
1820 | * | |
c2dbd49b KZ |
1821 | * Note, the @len returns length of the @data, including the terminating |
1822 | * '\0' character. | |
1823 | * | |
81f73792 KZ |
1824 | * Returns: 0 on success, or -1 in case of error. |
1825 | */ | |
51410fc6 | 1826 | int blkid_probe_lookup_value(blkid_probe pr, const char *name, |
6d042d0d | 1827 | const char **data, size_t *len) |
a0948ffe | 1828 | { |
81f73792 | 1829 | struct blkid_prval *v = __blkid_probe_lookup_value(pr, name); |
a0948ffe | 1830 | |
81f73792 | 1831 | if (!v) |
51410fc6 | 1832 | return -1; |
81f73792 KZ |
1833 | if (data) |
1834 | *data = (char *) v->data; | |
1835 | if (len) | |
1836 | *len = v->len; | |
81f73792 | 1837 | return 0; |
a0948ffe KZ |
1838 | } |
1839 | ||
81f73792 KZ |
1840 | /** |
1841 | * blkid_probe_has_value: | |
1842 | * @pr: probe | |
1843 | * @name: name of value | |
1844 | * | |
1845 | * Returns: 1 if value exist in probing result, otherwise 0. | |
1846 | */ | |
51410fc6 | 1847 | int blkid_probe_has_value(blkid_probe pr, const char *name) |
a0948ffe | 1848 | { |
51410fc6 KZ |
1849 | if (blkid_probe_lookup_value(pr, name, NULL, NULL) == 0) |
1850 | return 1; | |
a0948ffe KZ |
1851 | return 0; |
1852 | } | |
1853 | ||
6c4a7811 OO |
1854 | struct blkid_prval *blkid_probe_last_value(blkid_probe pr) |
1855 | { | |
af17d349 | 1856 | if (!pr || list_empty(&pr->values)) |
6c4a7811 OO |
1857 | return NULL; |
1858 | ||
af17d349 | 1859 | return list_last_entry(&pr->values, struct blkid_prval, prvals); |
6c4a7811 OO |
1860 | } |
1861 | ||
1862 | ||
1c1726a7 KZ |
1863 | struct blkid_prval *__blkid_probe_get_value(blkid_probe pr, int num) |
1864 | { | |
6c4a7811 OO |
1865 | int i = 0; |
1866 | struct list_head *p; | |
1867 | ||
1868 | if (!pr || num < 0) | |
1c1726a7 KZ |
1869 | return NULL; |
1870 | ||
af17d349 | 1871 | list_for_each(p, &pr->values) { |
6c4a7811 OO |
1872 | if (i++ != num) |
1873 | continue; | |
1874 | return list_entry(p, struct blkid_prval, prvals); | |
1875 | } | |
1876 | return NULL; | |
1c1726a7 KZ |
1877 | } |
1878 | ||
1879 | struct blkid_prval *__blkid_probe_lookup_value(blkid_probe pr, const char *name) | |
1880 | { | |
6c4a7811 | 1881 | struct list_head *p; |
1c1726a7 | 1882 | |
af17d349 | 1883 | if (!pr || list_empty(&pr->values) || !name) |
1c1726a7 KZ |
1884 | return NULL; |
1885 | ||
af17d349 | 1886 | list_for_each(p, &pr->values) { |
6c4a7811 OO |
1887 | struct blkid_prval *v = list_entry(p, struct blkid_prval, |
1888 | prvals); | |
1c1726a7 KZ |
1889 | |
1890 | if (v->name && strcmp(name, v->name) == 0) { | |
c62a6311 | 1891 | DBG(LOWPROBE, ul_debug("returning %s value", v->name)); |
1c1726a7 KZ |
1892 | return v; |
1893 | } | |
1894 | } | |
1895 | return NULL; | |
1896 | } | |
1897 | ||
201529bd KZ |
1898 | |
1899 | /* converts DCE UUID (uuid[16]) to human readable string | |
1900 | * - the @len should be always 37 */ | |
201529bd | 1901 | #ifdef HAVE_LIBUUID |
c9f51c71 KZ |
1902 | void blkid_unparse_uuid(const unsigned char *uuid, char *str, |
1903 | size_t len __attribute__((__unused__))) | |
1904 | { | |
201529bd | 1905 | uuid_unparse(uuid, str); |
c9f51c71 | 1906 | } |
201529bd | 1907 | #else |
c9f51c71 KZ |
1908 | void blkid_unparse_uuid(const unsigned char *uuid, char *str, size_t len) |
1909 | { | |
201529bd KZ |
1910 | snprintf(str, len, |
1911 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", | |
1912 | uuid[0], uuid[1], uuid[2], uuid[3], | |
1913 | uuid[4], uuid[5], | |
1914 | uuid[6], uuid[7], | |
1915 | uuid[8], uuid[9], | |
1916 | uuid[10], uuid[11], uuid[12], uuid[13], uuid[14],uuid[15]); | |
201529bd | 1917 | } |
c9f51c71 | 1918 | #endif |
201529bd | 1919 | |
9c06cdbf KZ |
1920 | /* like uuid_is_null() from libuuid, but works with arbitrary size of UUID */ |
1921 | int blkid_uuid_is_empty(const unsigned char *buf, size_t len) | |
1922 | { | |
1923 | size_t i; | |
1924 | ||
1925 | for (i = 0; i < len; i++) | |
1926 | if (buf[i]) | |
1927 | return 0; | |
1928 | return 1; | |
1929 | } | |
c2dbd49b KZ |
1930 | |
1931 | /* Removes whitespace from the right-hand side of a string (trailing | |
1932 | * whitespace). | |
1933 | * | |
1934 | * Returns size of the new string (without \0). | |
1935 | */ | |
1936 | size_t blkid_rtrim_whitespace(unsigned char *str) | |
1937 | { | |
22e9e9c8 | 1938 | return rtrim_whitespace(str); |
c2dbd49b KZ |
1939 | } |
1940 | ||
fafe46bc ZAK |
1941 | /* Removes whitespace from the left-hand side of a string. |
1942 | * | |
1943 | * Returns size of the new string (without \0). | |
1944 | */ | |
1945 | size_t blkid_ltrim_whitespace(unsigned char *str) | |
1946 | { | |
22e9e9c8 | 1947 | return ltrim_whitespace(str); |
fafe46bc | 1948 | } |
22e9e9c8 | 1949 | |
8b7eae45 KZ |
1950 | /* |
1951 | * Some mkfs-like utils wipe some parts (usually begin) of the device. | |
1952 | * For example LVM (pvcreate) or mkswap(8). This information could be used | |
1953 | * for later resolution to conflicts between superblocks. | |
1954 | * | |
1955 | * For example we found valid LVM superblock, LVM wipes 8KiB at the begin of | |
89d39d22 KZ |
1956 | * the device. If we found another signature (for example MBR) within the |
1957 | * wiped area then the signature has been added later and LVM superblock | |
1958 | * should be ignore. | |
8b7eae45 KZ |
1959 | * |
1960 | * Note that this heuristic is not 100% reliable, for example "pvcreate --zero | |
1961 | * n" allows to keep the begin of the device unmodified. It's probably better | |
1962 | * to use this heuristic for conflicts between superblocks and partition tables | |
1963 | * than for conflicts between filesystem superblocks -- existence of unwanted | |
1964 | * partition table is very unusual, because PT is pretty visible (parsed and | |
1965 | * interpreted by kernel). | |
89d39d22 KZ |
1966 | * |
1967 | * Note that we usually expect only one signature on the device, it means that | |
1968 | * we have to remember only one wiped area from previously successfully | |
1969 | * detected signature. | |
1970 | * | |
1971 | * blkid_probe_set_wiper() -- defines wiped area (e.g. LVM) | |
1972 | * blkid_probe_use_wiper() -- try to use area (e.g. MBR) | |
1973 | * | |
1974 | * Note that there is not relation between _wiper and blkid_to_wipe(). | |
1975 | * | |
8b7eae45 | 1976 | */ |
f12cd8d1 | 1977 | void blkid_probe_set_wiper(blkid_probe pr, uint64_t off, uint64_t size) |
8b7eae45 KZ |
1978 | { |
1979 | struct blkid_chain *chn; | |
1980 | ||
1981 | if (!pr) | |
1982 | return; | |
1983 | ||
1984 | if (!size) { | |
c62a6311 | 1985 | DBG(LOWPROBE, ul_debug("zeroize wiper")); |
8b7eae45 KZ |
1986 | pr->wipe_size = pr->wipe_off = 0; |
1987 | pr->wipe_chain = NULL; | |
1988 | return; | |
1989 | } | |
1990 | ||
1991 | chn = pr->cur_chain; | |
1992 | ||
1993 | if (!chn || !chn->driver || | |
c9f51c71 | 1994 | chn->idx < 0 || (size_t) chn->idx >= chn->driver->nidinfos) |
8b7eae45 KZ |
1995 | return; |
1996 | ||
1997 | pr->wipe_size = size; | |
1998 | pr->wipe_off = off; | |
1999 | pr->wipe_chain = chn; | |
2000 | ||
0540ea54 | 2001 | DBG(LOWPROBE, |
fdbd7bb9 | 2002 | ul_debug("wiper set to %s::%s off=%"PRIu64" size=%"PRIu64"", |
8b7eae45 KZ |
2003 | chn->driver->name, |
2004 | chn->driver->idinfos[chn->idx]->name, | |
2005 | pr->wipe_off, pr->wipe_size)); | |
2006 | return; | |
2007 | } | |
2008 | ||
2009 | /* | |
2010 | * Returns 1 if the <@off,@size> area was wiped | |
2011 | */ | |
f12cd8d1 | 2012 | int blkid_probe_is_wiped(blkid_probe pr, struct blkid_chain **chn, uint64_t off, uint64_t size) |
8b7eae45 KZ |
2013 | { |
2014 | if (!pr || !size) | |
2015 | return 0; | |
2016 | ||
2017 | if (pr->wipe_off <= off && off + size <= pr->wipe_off + pr->wipe_size) { | |
2018 | if (chn) | |
2019 | *chn = pr->wipe_chain; | |
2020 | return 1; | |
2021 | } | |
2022 | return 0; | |
2023 | } | |
2024 | ||
89d39d22 KZ |
2025 | /* |
2026 | * Try to use any area -- if the area has been previously wiped then the | |
2027 | * previous probing result should be ignored (reseted). | |
2028 | */ | |
f12cd8d1 | 2029 | void blkid_probe_use_wiper(blkid_probe pr, uint64_t off, uint64_t size) |
8b7eae45 KZ |
2030 | { |
2031 | struct blkid_chain *chn = NULL; | |
2032 | ||
2033 | if (blkid_probe_is_wiped(pr, &chn, off, size) && chn) { | |
c62a6311 | 2034 | DBG(LOWPROBE, ul_debug("previously wiped area modified " |
0540ea54 | 2035 | " -- ignore previous results")); |
8b7eae45 | 2036 | blkid_probe_set_wiper(pr, 0, 0); |
af17d349 | 2037 | blkid_probe_chain_reset_values(pr, chn); |
8b7eae45 KZ |
2038 | } |
2039 | } |