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1 | /* | |
2 | * fs/partitions/check.c | |
3 | * | |
4 | * Code extracted from drivers/block/genhd.c | |
5 | * Copyright (C) 1991-1998 Linus Torvalds | |
6 | * Re-organised Feb 1998 Russell King | |
7 | * | |
8 | * We now have independent partition support from the | |
9 | * block drivers, which allows all the partition code to | |
10 | * be grouped in one location, and it to be mostly self | |
11 | * contained. | |
12 | * | |
13 | * Added needed MAJORS for new pairs, {hdi,hdj}, {hdk,hdl} | |
14 | */ | |
15 | ||
16 | #include <linux/init.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/fs.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/kmod.h> | |
21 | #include <linux/ctype.h> | |
22 | #include <linux/genhd.h> | |
23 | #include <linux/blktrace_api.h> | |
24 | ||
25 | #include "check.h" | |
26 | ||
27 | #include "acorn.h" | |
28 | #include "amiga.h" | |
29 | #include "atari.h" | |
30 | #include "ldm.h" | |
31 | #include "mac.h" | |
32 | #include "msdos.h" | |
33 | #include "osf.h" | |
34 | #include "sgi.h" | |
35 | #include "sun.h" | |
36 | #include "ibm.h" | |
37 | #include "ultrix.h" | |
38 | #include "efi.h" | |
39 | #include "karma.h" | |
40 | #include "sysv68.h" | |
41 | ||
42 | #ifdef CONFIG_BLK_DEV_MD | |
43 | extern void md_autodetect_dev(dev_t dev); | |
44 | #endif | |
45 | ||
46 | int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/ | |
47 | ||
48 | static int (*check_part[])(struct parsed_partitions *) = { | |
49 | /* | |
50 | * Probe partition formats with tables at disk address 0 | |
51 | * that also have an ADFS boot block at 0xdc0. | |
52 | */ | |
53 | #ifdef CONFIG_ACORN_PARTITION_ICS | |
54 | adfspart_check_ICS, | |
55 | #endif | |
56 | #ifdef CONFIG_ACORN_PARTITION_POWERTEC | |
57 | adfspart_check_POWERTEC, | |
58 | #endif | |
59 | #ifdef CONFIG_ACORN_PARTITION_EESOX | |
60 | adfspart_check_EESOX, | |
61 | #endif | |
62 | ||
63 | /* | |
64 | * Now move on to formats that only have partition info at | |
65 | * disk address 0xdc0. Since these may also have stale | |
66 | * PC/BIOS partition tables, they need to come before | |
67 | * the msdos entry. | |
68 | */ | |
69 | #ifdef CONFIG_ACORN_PARTITION_CUMANA | |
70 | adfspart_check_CUMANA, | |
71 | #endif | |
72 | #ifdef CONFIG_ACORN_PARTITION_ADFS | |
73 | adfspart_check_ADFS, | |
74 | #endif | |
75 | ||
76 | #ifdef CONFIG_EFI_PARTITION | |
77 | efi_partition, /* this must come before msdos */ | |
78 | #endif | |
79 | #ifdef CONFIG_SGI_PARTITION | |
80 | sgi_partition, | |
81 | #endif | |
82 | #ifdef CONFIG_LDM_PARTITION | |
83 | ldm_partition, /* this must come before msdos */ | |
84 | #endif | |
85 | #ifdef CONFIG_MSDOS_PARTITION | |
86 | msdos_partition, | |
87 | #endif | |
88 | #ifdef CONFIG_OSF_PARTITION | |
89 | osf_partition, | |
90 | #endif | |
91 | #ifdef CONFIG_SUN_PARTITION | |
92 | sun_partition, | |
93 | #endif | |
94 | #ifdef CONFIG_AMIGA_PARTITION | |
95 | amiga_partition, | |
96 | #endif | |
97 | #ifdef CONFIG_ATARI_PARTITION | |
98 | atari_partition, | |
99 | #endif | |
100 | #ifdef CONFIG_MAC_PARTITION | |
101 | mac_partition, | |
102 | #endif | |
103 | #ifdef CONFIG_ULTRIX_PARTITION | |
104 | ultrix_partition, | |
105 | #endif | |
106 | #ifdef CONFIG_IBM_PARTITION | |
107 | ibm_partition, | |
108 | #endif | |
109 | #ifdef CONFIG_KARMA_PARTITION | |
110 | karma_partition, | |
111 | #endif | |
112 | #ifdef CONFIG_SYSV68_PARTITION | |
113 | sysv68_partition, | |
114 | #endif | |
115 | NULL | |
116 | }; | |
117 | ||
118 | /* | |
119 | * disk_name() is used by partition check code and the genhd driver. | |
120 | * It formats the devicename of the indicated disk into | |
121 | * the supplied buffer (of size at least 32), and returns | |
122 | * a pointer to that same buffer (for convenience). | |
123 | */ | |
124 | ||
125 | char *disk_name(struct gendisk *hd, int partno, char *buf) | |
126 | { | |
127 | if (!partno) | |
128 | snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name); | |
129 | else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) | |
130 | snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, partno); | |
131 | else | |
132 | snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, partno); | |
133 | ||
134 | return buf; | |
135 | } | |
136 | ||
137 | const char *bdevname(struct block_device *bdev, char *buf) | |
138 | { | |
139 | return disk_name(bdev->bd_disk, bdev->bd_part->partno, buf); | |
140 | } | |
141 | ||
142 | EXPORT_SYMBOL(bdevname); | |
143 | ||
144 | /* | |
145 | * There's very little reason to use this, you should really | |
146 | * have a struct block_device just about everywhere and use | |
147 | * bdevname() instead. | |
148 | */ | |
149 | const char *__bdevname(dev_t dev, char *buffer) | |
150 | { | |
151 | scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)", | |
152 | MAJOR(dev), MINOR(dev)); | |
153 | return buffer; | |
154 | } | |
155 | ||
156 | EXPORT_SYMBOL(__bdevname); | |
157 | ||
158 | static struct parsed_partitions * | |
159 | check_partition(struct gendisk *hd, struct block_device *bdev) | |
160 | { | |
161 | struct parsed_partitions *state; | |
162 | int i, res, err; | |
163 | ||
164 | state = kzalloc(sizeof(struct parsed_partitions), GFP_KERNEL); | |
165 | if (!state) | |
166 | return NULL; | |
167 | state->pp_buf = (char *)__get_free_page(GFP_KERNEL); | |
168 | if (!state->pp_buf) { | |
169 | kfree(state); | |
170 | return NULL; | |
171 | } | |
172 | state->pp_buf[0] = '\0'; | |
173 | ||
174 | state->bdev = bdev; | |
175 | disk_name(hd, 0, state->name); | |
176 | snprintf(state->pp_buf, PAGE_SIZE, " %s:", state->name); | |
177 | if (isdigit(state->name[strlen(state->name)-1])) | |
178 | sprintf(state->name, "p"); | |
179 | ||
180 | state->limit = disk_max_parts(hd); | |
181 | i = res = err = 0; | |
182 | while (!res && check_part[i]) { | |
183 | memset(&state->parts, 0, sizeof(state->parts)); | |
184 | res = check_part[i++](state); | |
185 | if (res < 0) { | |
186 | /* We have hit an I/O error which we don't report now. | |
187 | * But record it, and let the others do their job. | |
188 | */ | |
189 | err = res; | |
190 | res = 0; | |
191 | } | |
192 | ||
193 | } | |
194 | if (res > 0) { | |
195 | printk(KERN_INFO "%s", state->pp_buf); | |
196 | ||
197 | free_page((unsigned long)state->pp_buf); | |
198 | return state; | |
199 | } | |
200 | if (state->access_beyond_eod) | |
201 | err = -ENOSPC; | |
202 | if (err) | |
203 | /* The partition is unrecognized. So report I/O errors if there were any */ | |
204 | res = err; | |
205 | if (!res) | |
206 | strlcat(state->pp_buf, " unknown partition table\n", PAGE_SIZE); | |
207 | else if (warn_no_part) | |
208 | strlcat(state->pp_buf, " unable to read partition table\n", PAGE_SIZE); | |
209 | ||
210 | printk(KERN_INFO "%s", state->pp_buf); | |
211 | ||
212 | free_page((unsigned long)state->pp_buf); | |
213 | kfree(state); | |
214 | return ERR_PTR(res); | |
215 | } | |
216 | ||
217 | static ssize_t part_partition_show(struct device *dev, | |
218 | struct device_attribute *attr, char *buf) | |
219 | { | |
220 | struct hd_struct *p = dev_to_part(dev); | |
221 | ||
222 | return sprintf(buf, "%d\n", p->partno); | |
223 | } | |
224 | ||
225 | static ssize_t part_start_show(struct device *dev, | |
226 | struct device_attribute *attr, char *buf) | |
227 | { | |
228 | struct hd_struct *p = dev_to_part(dev); | |
229 | ||
230 | return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect); | |
231 | } | |
232 | ||
233 | ssize_t part_size_show(struct device *dev, | |
234 | struct device_attribute *attr, char *buf) | |
235 | { | |
236 | struct hd_struct *p = dev_to_part(dev); | |
237 | return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects); | |
238 | } | |
239 | ||
240 | ssize_t part_alignment_offset_show(struct device *dev, | |
241 | struct device_attribute *attr, char *buf) | |
242 | { | |
243 | struct hd_struct *p = dev_to_part(dev); | |
244 | return sprintf(buf, "%llu\n", (unsigned long long)p->alignment_offset); | |
245 | } | |
246 | ||
247 | ssize_t part_discard_alignment_show(struct device *dev, | |
248 | struct device_attribute *attr, char *buf) | |
249 | { | |
250 | struct hd_struct *p = dev_to_part(dev); | |
251 | return sprintf(buf, "%u\n", p->discard_alignment); | |
252 | } | |
253 | ||
254 | ssize_t part_stat_show(struct device *dev, | |
255 | struct device_attribute *attr, char *buf) | |
256 | { | |
257 | struct hd_struct *p = dev_to_part(dev); | |
258 | int cpu; | |
259 | ||
260 | cpu = part_stat_lock(); | |
261 | part_round_stats(cpu, p); | |
262 | part_stat_unlock(); | |
263 | return sprintf(buf, | |
264 | "%8lu %8lu %8llu %8u " | |
265 | "%8lu %8lu %8llu %8u " | |
266 | "%8u %8u %8u" | |
267 | "\n", | |
268 | part_stat_read(p, ios[READ]), | |
269 | part_stat_read(p, merges[READ]), | |
270 | (unsigned long long)part_stat_read(p, sectors[READ]), | |
271 | jiffies_to_msecs(part_stat_read(p, ticks[READ])), | |
272 | part_stat_read(p, ios[WRITE]), | |
273 | part_stat_read(p, merges[WRITE]), | |
274 | (unsigned long long)part_stat_read(p, sectors[WRITE]), | |
275 | jiffies_to_msecs(part_stat_read(p, ticks[WRITE])), | |
276 | part_in_flight(p), | |
277 | jiffies_to_msecs(part_stat_read(p, io_ticks)), | |
278 | jiffies_to_msecs(part_stat_read(p, time_in_queue))); | |
279 | } | |
280 | ||
281 | ssize_t part_inflight_show(struct device *dev, | |
282 | struct device_attribute *attr, char *buf) | |
283 | { | |
284 | struct hd_struct *p = dev_to_part(dev); | |
285 | ||
286 | return sprintf(buf, "%8u %8u\n", p->in_flight[0], p->in_flight[1]); | |
287 | } | |
288 | ||
289 | #ifdef CONFIG_FAIL_MAKE_REQUEST | |
290 | ssize_t part_fail_show(struct device *dev, | |
291 | struct device_attribute *attr, char *buf) | |
292 | { | |
293 | struct hd_struct *p = dev_to_part(dev); | |
294 | ||
295 | return sprintf(buf, "%d\n", p->make_it_fail); | |
296 | } | |
297 | ||
298 | ssize_t part_fail_store(struct device *dev, | |
299 | struct device_attribute *attr, | |
300 | const char *buf, size_t count) | |
301 | { | |
302 | struct hd_struct *p = dev_to_part(dev); | |
303 | int i; | |
304 | ||
305 | if (count > 0 && sscanf(buf, "%d", &i) > 0) | |
306 | p->make_it_fail = (i == 0) ? 0 : 1; | |
307 | ||
308 | return count; | |
309 | } | |
310 | #endif | |
311 | ||
312 | static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL); | |
313 | static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL); | |
314 | static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL); | |
315 | static DEVICE_ATTR(alignment_offset, S_IRUGO, part_alignment_offset_show, NULL); | |
316 | static DEVICE_ATTR(discard_alignment, S_IRUGO, part_discard_alignment_show, | |
317 | NULL); | |
318 | static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL); | |
319 | static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL); | |
320 | #ifdef CONFIG_FAIL_MAKE_REQUEST | |
321 | static struct device_attribute dev_attr_fail = | |
322 | __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store); | |
323 | #endif | |
324 | ||
325 | static struct attribute *part_attrs[] = { | |
326 | &dev_attr_partition.attr, | |
327 | &dev_attr_start.attr, | |
328 | &dev_attr_size.attr, | |
329 | &dev_attr_alignment_offset.attr, | |
330 | &dev_attr_discard_alignment.attr, | |
331 | &dev_attr_stat.attr, | |
332 | &dev_attr_inflight.attr, | |
333 | #ifdef CONFIG_FAIL_MAKE_REQUEST | |
334 | &dev_attr_fail.attr, | |
335 | #endif | |
336 | NULL | |
337 | }; | |
338 | ||
339 | static struct attribute_group part_attr_group = { | |
340 | .attrs = part_attrs, | |
341 | }; | |
342 | ||
343 | static const struct attribute_group *part_attr_groups[] = { | |
344 | &part_attr_group, | |
345 | #ifdef CONFIG_BLK_DEV_IO_TRACE | |
346 | &blk_trace_attr_group, | |
347 | #endif | |
348 | NULL | |
349 | }; | |
350 | ||
351 | static void part_release(struct device *dev) | |
352 | { | |
353 | struct hd_struct *p = dev_to_part(dev); | |
354 | free_part_stats(p); | |
355 | free_part_info(p); | |
356 | kfree(p); | |
357 | } | |
358 | ||
359 | struct device_type part_type = { | |
360 | .name = "partition", | |
361 | .groups = part_attr_groups, | |
362 | .release = part_release, | |
363 | }; | |
364 | ||
365 | static void delete_partition_rcu_cb(struct rcu_head *head) | |
366 | { | |
367 | struct hd_struct *part = container_of(head, struct hd_struct, rcu_head); | |
368 | ||
369 | part->start_sect = 0; | |
370 | part->nr_sects = 0; | |
371 | part_stat_set_all(part, 0); | |
372 | put_device(part_to_dev(part)); | |
373 | } | |
374 | ||
375 | void delete_partition(struct gendisk *disk, int partno) | |
376 | { | |
377 | struct disk_part_tbl *ptbl = disk->part_tbl; | |
378 | struct hd_struct *part; | |
379 | ||
380 | if (partno >= ptbl->len) | |
381 | return; | |
382 | ||
383 | part = ptbl->part[partno]; | |
384 | if (!part) | |
385 | return; | |
386 | ||
387 | blk_free_devt(part_devt(part)); | |
388 | rcu_assign_pointer(ptbl->part[partno], NULL); | |
389 | rcu_assign_pointer(ptbl->last_lookup, NULL); | |
390 | kobject_put(part->holder_dir); | |
391 | device_del(part_to_dev(part)); | |
392 | ||
393 | call_rcu(&part->rcu_head, delete_partition_rcu_cb); | |
394 | } | |
395 | ||
396 | static ssize_t whole_disk_show(struct device *dev, | |
397 | struct device_attribute *attr, char *buf) | |
398 | { | |
399 | return 0; | |
400 | } | |
401 | static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH, | |
402 | whole_disk_show, NULL); | |
403 | ||
404 | struct hd_struct *add_partition(struct gendisk *disk, int partno, | |
405 | sector_t start, sector_t len, int flags, | |
406 | struct partition_meta_info *info) | |
407 | { | |
408 | struct hd_struct *p; | |
409 | dev_t devt = MKDEV(0, 0); | |
410 | struct device *ddev = disk_to_dev(disk); | |
411 | struct device *pdev; | |
412 | struct disk_part_tbl *ptbl; | |
413 | const char *dname; | |
414 | int err; | |
415 | ||
416 | err = disk_expand_part_tbl(disk, partno); | |
417 | if (err) | |
418 | return ERR_PTR(err); | |
419 | ptbl = disk->part_tbl; | |
420 | ||
421 | if (ptbl->part[partno]) | |
422 | return ERR_PTR(-EBUSY); | |
423 | ||
424 | p = kzalloc(sizeof(*p), GFP_KERNEL); | |
425 | if (!p) | |
426 | return ERR_PTR(-EBUSY); | |
427 | ||
428 | if (!init_part_stats(p)) { | |
429 | err = -ENOMEM; | |
430 | goto out_free; | |
431 | } | |
432 | pdev = part_to_dev(p); | |
433 | ||
434 | p->start_sect = start; | |
435 | p->alignment_offset = | |
436 | queue_limit_alignment_offset(&disk->queue->limits, start); | |
437 | p->discard_alignment = | |
438 | queue_limit_discard_alignment(&disk->queue->limits, start); | |
439 | p->nr_sects = len; | |
440 | p->partno = partno; | |
441 | p->policy = get_disk_ro(disk); | |
442 | ||
443 | if (info) { | |
444 | struct partition_meta_info *pinfo = alloc_part_info(disk); | |
445 | if (!pinfo) | |
446 | goto out_free_stats; | |
447 | memcpy(pinfo, info, sizeof(*info)); | |
448 | p->info = pinfo; | |
449 | } | |
450 | ||
451 | dname = dev_name(ddev); | |
452 | if (isdigit(dname[strlen(dname) - 1])) | |
453 | dev_set_name(pdev, "%sp%d", dname, partno); | |
454 | else | |
455 | dev_set_name(pdev, "%s%d", dname, partno); | |
456 | ||
457 | device_initialize(pdev); | |
458 | pdev->class = &block_class; | |
459 | pdev->type = &part_type; | |
460 | pdev->parent = ddev; | |
461 | ||
462 | err = blk_alloc_devt(p, &devt); | |
463 | if (err) | |
464 | goto out_free_info; | |
465 | pdev->devt = devt; | |
466 | ||
467 | /* delay uevent until 'holders' subdir is created */ | |
468 | dev_set_uevent_suppress(pdev, 1); | |
469 | err = device_add(pdev); | |
470 | if (err) | |
471 | goto out_put; | |
472 | ||
473 | err = -ENOMEM; | |
474 | p->holder_dir = kobject_create_and_add("holders", &pdev->kobj); | |
475 | if (!p->holder_dir) | |
476 | goto out_del; | |
477 | ||
478 | dev_set_uevent_suppress(pdev, 0); | |
479 | if (flags & ADDPART_FLAG_WHOLEDISK) { | |
480 | err = device_create_file(pdev, &dev_attr_whole_disk); | |
481 | if (err) | |
482 | goto out_del; | |
483 | } | |
484 | ||
485 | /* everything is up and running, commence */ | |
486 | rcu_assign_pointer(ptbl->part[partno], p); | |
487 | ||
488 | /* suppress uevent if the disk supresses it */ | |
489 | if (!dev_get_uevent_suppress(ddev)) | |
490 | kobject_uevent(&pdev->kobj, KOBJ_ADD); | |
491 | ||
492 | return p; | |
493 | ||
494 | out_free_info: | |
495 | free_part_info(p); | |
496 | out_free_stats: | |
497 | free_part_stats(p); | |
498 | out_free: | |
499 | kfree(p); | |
500 | return ERR_PTR(err); | |
501 | out_del: | |
502 | kobject_put(p->holder_dir); | |
503 | device_del(pdev); | |
504 | out_put: | |
505 | put_device(pdev); | |
506 | blk_free_devt(devt); | |
507 | return ERR_PTR(err); | |
508 | } | |
509 | ||
510 | /* Not exported, helper to add_disk(). */ | |
511 | void register_disk(struct gendisk *disk) | |
512 | { | |
513 | struct device *ddev = disk_to_dev(disk); | |
514 | struct block_device *bdev; | |
515 | struct disk_part_iter piter; | |
516 | struct hd_struct *part; | |
517 | int err; | |
518 | ||
519 | ddev->parent = disk->driverfs_dev; | |
520 | ||
521 | dev_set_name(ddev, disk->disk_name); | |
522 | ||
523 | /* delay uevents, until we scanned partition table */ | |
524 | dev_set_uevent_suppress(ddev, 1); | |
525 | ||
526 | if (device_add(ddev)) | |
527 | return; | |
528 | if (!sysfs_deprecated) { | |
529 | err = sysfs_create_link(block_depr, &ddev->kobj, | |
530 | kobject_name(&ddev->kobj)); | |
531 | if (err) { | |
532 | device_del(ddev); | |
533 | return; | |
534 | } | |
535 | } | |
536 | disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj); | |
537 | disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj); | |
538 | ||
539 | /* No minors to use for partitions */ | |
540 | if (!disk_partitionable(disk)) | |
541 | goto exit; | |
542 | ||
543 | /* No such device (e.g., media were just removed) */ | |
544 | if (!get_capacity(disk)) | |
545 | goto exit; | |
546 | ||
547 | bdev = bdget_disk(disk, 0); | |
548 | if (!bdev) | |
549 | goto exit; | |
550 | ||
551 | bdev->bd_invalidated = 1; | |
552 | err = blkdev_get(bdev, FMODE_READ); | |
553 | if (err < 0) | |
554 | goto exit; | |
555 | blkdev_put(bdev, FMODE_READ); | |
556 | ||
557 | exit: | |
558 | /* announce disk after possible partitions are created */ | |
559 | dev_set_uevent_suppress(ddev, 0); | |
560 | kobject_uevent(&ddev->kobj, KOBJ_ADD); | |
561 | ||
562 | /* announce possible partitions */ | |
563 | disk_part_iter_init(&piter, disk, 0); | |
564 | while ((part = disk_part_iter_next(&piter))) | |
565 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD); | |
566 | disk_part_iter_exit(&piter); | |
567 | } | |
568 | ||
569 | static bool disk_unlock_native_capacity(struct gendisk *disk) | |
570 | { | |
571 | const struct block_device_operations *bdops = disk->fops; | |
572 | ||
573 | if (bdops->unlock_native_capacity && | |
574 | !(disk->flags & GENHD_FL_NATIVE_CAPACITY)) { | |
575 | printk(KERN_CONT "enabling native capacity\n"); | |
576 | bdops->unlock_native_capacity(disk); | |
577 | disk->flags |= GENHD_FL_NATIVE_CAPACITY; | |
578 | return true; | |
579 | } else { | |
580 | printk(KERN_CONT "truncated\n"); | |
581 | return false; | |
582 | } | |
583 | } | |
584 | ||
585 | int rescan_partitions(struct gendisk *disk, struct block_device *bdev) | |
586 | { | |
587 | struct parsed_partitions *state = NULL; | |
588 | struct disk_part_iter piter; | |
589 | struct hd_struct *part; | |
590 | int p, highest, res; | |
591 | rescan: | |
592 | if (state && !IS_ERR(state)) { | |
593 | kfree(state); | |
594 | state = NULL; | |
595 | } | |
596 | ||
597 | if (bdev->bd_part_count) | |
598 | return -EBUSY; | |
599 | res = invalidate_partition(disk, 0); | |
600 | if (res) | |
601 | return res; | |
602 | ||
603 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); | |
604 | while ((part = disk_part_iter_next(&piter))) | |
605 | delete_partition(disk, part->partno); | |
606 | disk_part_iter_exit(&piter); | |
607 | ||
608 | if (disk->fops->revalidate_disk) | |
609 | disk->fops->revalidate_disk(disk); | |
610 | check_disk_size_change(disk, bdev); | |
611 | bdev->bd_invalidated = 0; | |
612 | if (!get_capacity(disk) || !(state = check_partition(disk, bdev))) | |
613 | return 0; | |
614 | if (IS_ERR(state)) { | |
615 | /* | |
616 | * I/O error reading the partition table. If any | |
617 | * partition code tried to read beyond EOD, retry | |
618 | * after unlocking native capacity. | |
619 | */ | |
620 | if (PTR_ERR(state) == -ENOSPC) { | |
621 | printk(KERN_WARNING "%s: partition table beyond EOD, ", | |
622 | disk->disk_name); | |
623 | if (disk_unlock_native_capacity(disk)) | |
624 | goto rescan; | |
625 | } | |
626 | return -EIO; | |
627 | } | |
628 | /* | |
629 | * If any partition code tried to read beyond EOD, try | |
630 | * unlocking native capacity even if partition table is | |
631 | * sucessfully read as we could be missing some partitions. | |
632 | */ | |
633 | if (state->access_beyond_eod) { | |
634 | printk(KERN_WARNING | |
635 | "%s: partition table partially beyond EOD, ", | |
636 | disk->disk_name); | |
637 | if (disk_unlock_native_capacity(disk)) | |
638 | goto rescan; | |
639 | } | |
640 | ||
641 | /* tell userspace that the media / partition table may have changed */ | |
642 | kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); | |
643 | ||
644 | /* Detect the highest partition number and preallocate | |
645 | * disk->part_tbl. This is an optimization and not strictly | |
646 | * necessary. | |
647 | */ | |
648 | for (p = 1, highest = 0; p < state->limit; p++) | |
649 | if (state->parts[p].size) | |
650 | highest = p; | |
651 | ||
652 | disk_expand_part_tbl(disk, highest); | |
653 | ||
654 | /* add partitions */ | |
655 | for (p = 1; p < state->limit; p++) { | |
656 | sector_t size, from; | |
657 | struct partition_meta_info *info = NULL; | |
658 | ||
659 | size = state->parts[p].size; | |
660 | if (!size) | |
661 | continue; | |
662 | ||
663 | from = state->parts[p].from; | |
664 | if (from >= get_capacity(disk)) { | |
665 | printk(KERN_WARNING | |
666 | "%s: p%d start %llu is beyond EOD, ", | |
667 | disk->disk_name, p, (unsigned long long) from); | |
668 | if (disk_unlock_native_capacity(disk)) | |
669 | goto rescan; | |
670 | continue; | |
671 | } | |
672 | ||
673 | if (from + size > get_capacity(disk)) { | |
674 | printk(KERN_WARNING | |
675 | "%s: p%d size %llu extends beyond EOD, ", | |
676 | disk->disk_name, p, (unsigned long long) size); | |
677 | ||
678 | if (disk_unlock_native_capacity(disk)) { | |
679 | /* free state and restart */ | |
680 | goto rescan; | |
681 | } else { | |
682 | /* | |
683 | * we can not ignore partitions of broken tables | |
684 | * created by for example camera firmware, but | |
685 | * we limit them to the end of the disk to avoid | |
686 | * creating invalid block devices | |
687 | */ | |
688 | size = get_capacity(disk) - from; | |
689 | } | |
690 | } | |
691 | ||
692 | if (state->parts[p].has_info) | |
693 | info = &state->parts[p].info; | |
694 | part = add_partition(disk, p, from, size, | |
695 | state->parts[p].flags, | |
696 | &state->parts[p].info); | |
697 | if (IS_ERR(part)) { | |
698 | printk(KERN_ERR " %s: p%d could not be added: %ld\n", | |
699 | disk->disk_name, p, -PTR_ERR(part)); | |
700 | continue; | |
701 | } | |
702 | #ifdef CONFIG_BLK_DEV_MD | |
703 | if (state->parts[p].flags & ADDPART_FLAG_RAID) | |
704 | md_autodetect_dev(part_to_dev(part)->devt); | |
705 | #endif | |
706 | } | |
707 | kfree(state); | |
708 | return 0; | |
709 | } | |
710 | ||
711 | unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p) | |
712 | { | |
713 | struct address_space *mapping = bdev->bd_inode->i_mapping; | |
714 | struct page *page; | |
715 | ||
716 | page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)), | |
717 | NULL); | |
718 | if (!IS_ERR(page)) { | |
719 | if (PageError(page)) | |
720 | goto fail; | |
721 | p->v = page; | |
722 | return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9); | |
723 | fail: | |
724 | page_cache_release(page); | |
725 | } | |
726 | p->v = NULL; | |
727 | return NULL; | |
728 | } | |
729 | ||
730 | EXPORT_SYMBOL(read_dev_sector); | |
731 | ||
732 | void del_gendisk(struct gendisk *disk) | |
733 | { | |
734 | struct disk_part_iter piter; | |
735 | struct hd_struct *part; | |
736 | ||
737 | /* invalidate stuff */ | |
738 | disk_part_iter_init(&piter, disk, | |
739 | DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE); | |
740 | while ((part = disk_part_iter_next(&piter))) { | |
741 | invalidate_partition(disk, part->partno); | |
742 | delete_partition(disk, part->partno); | |
743 | } | |
744 | disk_part_iter_exit(&piter); | |
745 | ||
746 | invalidate_partition(disk, 0); | |
747 | blk_free_devt(disk_to_dev(disk)->devt); | |
748 | set_capacity(disk, 0); | |
749 | disk->flags &= ~GENHD_FL_UP; | |
750 | unlink_gendisk(disk); | |
751 | part_stat_set_all(&disk->part0, 0); | |
752 | disk->part0.stamp = 0; | |
753 | ||
754 | kobject_put(disk->part0.holder_dir); | |
755 | kobject_put(disk->slave_dir); | |
756 | disk->driverfs_dev = NULL; | |
757 | if (!sysfs_deprecated) | |
758 | sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk))); | |
759 | device_del(disk_to_dev(disk)); | |
760 | } |