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94ea4158 AV |
1 | /* |
2 | * Code extracted from drivers/block/genhd.c | |
3 | * Copyright (C) 1991-1998 Linus Torvalds | |
4 | * Re-organised Feb 1998 Russell King | |
5 | * | |
6 | * We now have independent partition support from the | |
7 | * block drivers, which allows all the partition code to | |
8 | * be grouped in one location, and it to be mostly self | |
9 | * contained. | |
10 | */ | |
11 | ||
12 | #include <linux/init.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/fs.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/kmod.h> | |
17 | #include <linux/ctype.h> | |
18 | #include <linux/genhd.h> | |
19 | #include <linux/blktrace_api.h> | |
20 | ||
21 | #include "partitions/check.h" | |
22 | ||
23 | #ifdef CONFIG_BLK_DEV_MD | |
24 | extern void md_autodetect_dev(dev_t dev); | |
25 | #endif | |
26 | ||
27 | /* | |
28 | * disk_name() is used by partition check code and the genhd driver. | |
29 | * It formats the devicename of the indicated disk into | |
30 | * the supplied buffer (of size at least 32), and returns | |
31 | * a pointer to that same buffer (for convenience). | |
32 | */ | |
33 | ||
34 | char *disk_name(struct gendisk *hd, int partno, char *buf) | |
35 | { | |
36 | if (!partno) | |
37 | snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name); | |
38 | else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) | |
39 | snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, partno); | |
40 | else | |
41 | snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, partno); | |
42 | ||
43 | return buf; | |
44 | } | |
45 | ||
46 | const char *bdevname(struct block_device *bdev, char *buf) | |
47 | { | |
48 | return disk_name(bdev->bd_disk, bdev->bd_part->partno, buf); | |
49 | } | |
50 | ||
51 | EXPORT_SYMBOL(bdevname); | |
52 | ||
53 | /* | |
54 | * There's very little reason to use this, you should really | |
55 | * have a struct block_device just about everywhere and use | |
56 | * bdevname() instead. | |
57 | */ | |
58 | const char *__bdevname(dev_t dev, char *buffer) | |
59 | { | |
60 | scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)", | |
61 | MAJOR(dev), MINOR(dev)); | |
62 | return buffer; | |
63 | } | |
64 | ||
65 | EXPORT_SYMBOL(__bdevname); | |
66 | ||
67 | static ssize_t part_partition_show(struct device *dev, | |
68 | struct device_attribute *attr, char *buf) | |
69 | { | |
70 | struct hd_struct *p = dev_to_part(dev); | |
71 | ||
72 | return sprintf(buf, "%d\n", p->partno); | |
73 | } | |
74 | ||
75 | static ssize_t part_start_show(struct device *dev, | |
76 | struct device_attribute *attr, char *buf) | |
77 | { | |
78 | struct hd_struct *p = dev_to_part(dev); | |
79 | ||
80 | return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect); | |
81 | } | |
82 | ||
83 | ssize_t part_size_show(struct device *dev, | |
84 | struct device_attribute *attr, char *buf) | |
85 | { | |
86 | struct hd_struct *p = dev_to_part(dev); | |
c83f6bf9 | 87 | return sprintf(buf, "%llu\n",(unsigned long long)part_nr_sects_read(p)); |
94ea4158 AV |
88 | } |
89 | ||
90 | static ssize_t part_ro_show(struct device *dev, | |
91 | struct device_attribute *attr, char *buf) | |
92 | { | |
93 | struct hd_struct *p = dev_to_part(dev); | |
94 | return sprintf(buf, "%d\n", p->policy ? 1 : 0); | |
95 | } | |
96 | ||
97 | static ssize_t part_alignment_offset_show(struct device *dev, | |
98 | struct device_attribute *attr, char *buf) | |
99 | { | |
100 | struct hd_struct *p = dev_to_part(dev); | |
101 | return sprintf(buf, "%llu\n", (unsigned long long)p->alignment_offset); | |
102 | } | |
103 | ||
104 | static ssize_t part_discard_alignment_show(struct device *dev, | |
105 | struct device_attribute *attr, char *buf) | |
106 | { | |
107 | struct hd_struct *p = dev_to_part(dev); | |
108 | return sprintf(buf, "%u\n", p->discard_alignment); | |
109 | } | |
110 | ||
111 | ssize_t part_stat_show(struct device *dev, | |
112 | struct device_attribute *attr, char *buf) | |
113 | { | |
114 | struct hd_struct *p = dev_to_part(dev); | |
115 | int cpu; | |
116 | ||
117 | cpu = part_stat_lock(); | |
118 | part_round_stats(cpu, p); | |
119 | part_stat_unlock(); | |
120 | return sprintf(buf, | |
121 | "%8lu %8lu %8llu %8u " | |
122 | "%8lu %8lu %8llu %8u " | |
123 | "%8u %8u %8u" | |
124 | "\n", | |
125 | part_stat_read(p, ios[READ]), | |
126 | part_stat_read(p, merges[READ]), | |
127 | (unsigned long long)part_stat_read(p, sectors[READ]), | |
128 | jiffies_to_msecs(part_stat_read(p, ticks[READ])), | |
129 | part_stat_read(p, ios[WRITE]), | |
130 | part_stat_read(p, merges[WRITE]), | |
131 | (unsigned long long)part_stat_read(p, sectors[WRITE]), | |
132 | jiffies_to_msecs(part_stat_read(p, ticks[WRITE])), | |
133 | part_in_flight(p), | |
134 | jiffies_to_msecs(part_stat_read(p, io_ticks)), | |
135 | jiffies_to_msecs(part_stat_read(p, time_in_queue))); | |
136 | } | |
137 | ||
138 | ssize_t part_inflight_show(struct device *dev, | |
139 | struct device_attribute *attr, char *buf) | |
140 | { | |
141 | struct hd_struct *p = dev_to_part(dev); | |
142 | ||
143 | return sprintf(buf, "%8u %8u\n", atomic_read(&p->in_flight[0]), | |
144 | atomic_read(&p->in_flight[1])); | |
145 | } | |
146 | ||
147 | #ifdef CONFIG_FAIL_MAKE_REQUEST | |
148 | ssize_t part_fail_show(struct device *dev, | |
149 | struct device_attribute *attr, char *buf) | |
150 | { | |
151 | struct hd_struct *p = dev_to_part(dev); | |
152 | ||
153 | return sprintf(buf, "%d\n", p->make_it_fail); | |
154 | } | |
155 | ||
156 | ssize_t part_fail_store(struct device *dev, | |
157 | struct device_attribute *attr, | |
158 | const char *buf, size_t count) | |
159 | { | |
160 | struct hd_struct *p = dev_to_part(dev); | |
161 | int i; | |
162 | ||
163 | if (count > 0 && sscanf(buf, "%d", &i) > 0) | |
164 | p->make_it_fail = (i == 0) ? 0 : 1; | |
165 | ||
166 | return count; | |
167 | } | |
168 | #endif | |
169 | ||
170 | static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL); | |
171 | static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL); | |
172 | static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL); | |
173 | static DEVICE_ATTR(ro, S_IRUGO, part_ro_show, NULL); | |
174 | static DEVICE_ATTR(alignment_offset, S_IRUGO, part_alignment_offset_show, NULL); | |
175 | static DEVICE_ATTR(discard_alignment, S_IRUGO, part_discard_alignment_show, | |
176 | NULL); | |
177 | static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL); | |
178 | static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL); | |
179 | #ifdef CONFIG_FAIL_MAKE_REQUEST | |
180 | static struct device_attribute dev_attr_fail = | |
181 | __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store); | |
182 | #endif | |
183 | ||
184 | static struct attribute *part_attrs[] = { | |
185 | &dev_attr_partition.attr, | |
186 | &dev_attr_start.attr, | |
187 | &dev_attr_size.attr, | |
188 | &dev_attr_ro.attr, | |
189 | &dev_attr_alignment_offset.attr, | |
190 | &dev_attr_discard_alignment.attr, | |
191 | &dev_attr_stat.attr, | |
192 | &dev_attr_inflight.attr, | |
193 | #ifdef CONFIG_FAIL_MAKE_REQUEST | |
194 | &dev_attr_fail.attr, | |
195 | #endif | |
196 | NULL | |
197 | }; | |
198 | ||
199 | static struct attribute_group part_attr_group = { | |
200 | .attrs = part_attrs, | |
201 | }; | |
202 | ||
203 | static const struct attribute_group *part_attr_groups[] = { | |
204 | &part_attr_group, | |
205 | #ifdef CONFIG_BLK_DEV_IO_TRACE | |
206 | &blk_trace_attr_group, | |
207 | #endif | |
208 | NULL | |
209 | }; | |
210 | ||
211 | static void part_release(struct device *dev) | |
212 | { | |
213 | struct hd_struct *p = dev_to_part(dev); | |
2da78092 | 214 | blk_free_devt(dev->devt); |
b54e5ed8 | 215 | hd_free_part(p); |
94ea4158 AV |
216 | kfree(p); |
217 | } | |
218 | ||
0d9c51a6 SM |
219 | static int part_uevent(struct device *dev, struct kobj_uevent_env *env) |
220 | { | |
221 | struct hd_struct *part = dev_to_part(dev); | |
222 | ||
223 | add_uevent_var(env, "PARTN=%u", part->partno); | |
224 | if (part->info && part->info->volname[0]) | |
225 | add_uevent_var(env, "PARTNAME=%s", part->info->volname); | |
226 | return 0; | |
227 | } | |
228 | ||
94ea4158 AV |
229 | struct device_type part_type = { |
230 | .name = "partition", | |
231 | .groups = part_attr_groups, | |
232 | .release = part_release, | |
0d9c51a6 | 233 | .uevent = part_uevent, |
94ea4158 AV |
234 | }; |
235 | ||
236 | static void delete_partition_rcu_cb(struct rcu_head *head) | |
237 | { | |
238 | struct hd_struct *part = container_of(head, struct hd_struct, rcu_head); | |
239 | ||
240 | part->start_sect = 0; | |
241 | part->nr_sects = 0; | |
242 | part_stat_set_all(part, 0); | |
243 | put_device(part_to_dev(part)); | |
244 | } | |
245 | ||
6c71013e | 246 | void __delete_partition(struct percpu_ref *ref) |
94ea4158 | 247 | { |
6c71013e | 248 | struct hd_struct *part = container_of(ref, struct hd_struct, ref); |
94ea4158 AV |
249 | call_rcu(&part->rcu_head, delete_partition_rcu_cb); |
250 | } | |
251 | ||
252 | void delete_partition(struct gendisk *disk, int partno) | |
253 | { | |
254 | struct disk_part_tbl *ptbl = disk->part_tbl; | |
255 | struct hd_struct *part; | |
256 | ||
257 | if (partno >= ptbl->len) | |
258 | return; | |
259 | ||
260 | part = ptbl->part[partno]; | |
261 | if (!part) | |
262 | return; | |
263 | ||
94ea4158 AV |
264 | rcu_assign_pointer(ptbl->part[partno], NULL); |
265 | rcu_assign_pointer(ptbl->last_lookup, NULL); | |
266 | kobject_put(part->holder_dir); | |
267 | device_del(part_to_dev(part)); | |
268 | ||
6c71013e | 269 | hd_struct_kill(part); |
94ea4158 AV |
270 | } |
271 | ||
272 | static ssize_t whole_disk_show(struct device *dev, | |
273 | struct device_attribute *attr, char *buf) | |
274 | { | |
275 | return 0; | |
276 | } | |
277 | static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH, | |
278 | whole_disk_show, NULL); | |
279 | ||
280 | struct hd_struct *add_partition(struct gendisk *disk, int partno, | |
281 | sector_t start, sector_t len, int flags, | |
282 | struct partition_meta_info *info) | |
283 | { | |
284 | struct hd_struct *p; | |
285 | dev_t devt = MKDEV(0, 0); | |
286 | struct device *ddev = disk_to_dev(disk); | |
287 | struct device *pdev; | |
288 | struct disk_part_tbl *ptbl; | |
289 | const char *dname; | |
290 | int err; | |
291 | ||
292 | err = disk_expand_part_tbl(disk, partno); | |
293 | if (err) | |
294 | return ERR_PTR(err); | |
295 | ptbl = disk->part_tbl; | |
296 | ||
297 | if (ptbl->part[partno]) | |
298 | return ERR_PTR(-EBUSY); | |
299 | ||
300 | p = kzalloc(sizeof(*p), GFP_KERNEL); | |
301 | if (!p) | |
302 | return ERR_PTR(-EBUSY); | |
303 | ||
304 | if (!init_part_stats(p)) { | |
305 | err = -ENOMEM; | |
306 | goto out_free; | |
307 | } | |
c83f6bf9 VG |
308 | |
309 | seqcount_init(&p->nr_sects_seq); | |
94ea4158 AV |
310 | pdev = part_to_dev(p); |
311 | ||
312 | p->start_sect = start; | |
313 | p->alignment_offset = | |
314 | queue_limit_alignment_offset(&disk->queue->limits, start); | |
315 | p->discard_alignment = | |
316 | queue_limit_discard_alignment(&disk->queue->limits, start); | |
317 | p->nr_sects = len; | |
318 | p->partno = partno; | |
319 | p->policy = get_disk_ro(disk); | |
320 | ||
321 | if (info) { | |
322 | struct partition_meta_info *pinfo = alloc_part_info(disk); | |
323 | if (!pinfo) | |
324 | goto out_free_stats; | |
325 | memcpy(pinfo, info, sizeof(*info)); | |
326 | p->info = pinfo; | |
327 | } | |
328 | ||
329 | dname = dev_name(ddev); | |
330 | if (isdigit(dname[strlen(dname) - 1])) | |
331 | dev_set_name(pdev, "%sp%d", dname, partno); | |
332 | else | |
333 | dev_set_name(pdev, "%s%d", dname, partno); | |
334 | ||
335 | device_initialize(pdev); | |
336 | pdev->class = &block_class; | |
337 | pdev->type = &part_type; | |
338 | pdev->parent = ddev; | |
339 | ||
340 | err = blk_alloc_devt(p, &devt); | |
341 | if (err) | |
342 | goto out_free_info; | |
343 | pdev->devt = devt; | |
344 | ||
345 | /* delay uevent until 'holders' subdir is created */ | |
346 | dev_set_uevent_suppress(pdev, 1); | |
347 | err = device_add(pdev); | |
348 | if (err) | |
349 | goto out_put; | |
350 | ||
351 | err = -ENOMEM; | |
352 | p->holder_dir = kobject_create_and_add("holders", &pdev->kobj); | |
353 | if (!p->holder_dir) | |
354 | goto out_del; | |
355 | ||
356 | dev_set_uevent_suppress(pdev, 0); | |
357 | if (flags & ADDPART_FLAG_WHOLEDISK) { | |
358 | err = device_create_file(pdev, &dev_attr_whole_disk); | |
359 | if (err) | |
360 | goto out_del; | |
361 | } | |
362 | ||
b30a337c ML |
363 | err = hd_ref_init(p); |
364 | if (err) { | |
365 | if (flags & ADDPART_FLAG_WHOLEDISK) | |
366 | goto out_remove_file; | |
367 | goto out_del; | |
368 | } | |
369 | ||
94ea4158 AV |
370 | /* everything is up and running, commence */ |
371 | rcu_assign_pointer(ptbl->part[partno], p); | |
372 | ||
373 | /* suppress uevent if the disk suppresses it */ | |
374 | if (!dev_get_uevent_suppress(ddev)) | |
375 | kobject_uevent(&pdev->kobj, KOBJ_ADD); | |
b30a337c | 376 | return p; |
94ea4158 AV |
377 | |
378 | out_free_info: | |
379 | free_part_info(p); | |
380 | out_free_stats: | |
381 | free_part_stats(p); | |
382 | out_free: | |
383 | kfree(p); | |
384 | return ERR_PTR(err); | |
b30a337c ML |
385 | out_remove_file: |
386 | device_remove_file(pdev, &dev_attr_whole_disk); | |
94ea4158 AV |
387 | out_del: |
388 | kobject_put(p->holder_dir); | |
389 | device_del(pdev); | |
390 | out_put: | |
391 | put_device(pdev); | |
392 | blk_free_devt(devt); | |
393 | return ERR_PTR(err); | |
394 | } | |
395 | ||
396 | static bool disk_unlock_native_capacity(struct gendisk *disk) | |
397 | { | |
398 | const struct block_device_operations *bdops = disk->fops; | |
399 | ||
400 | if (bdops->unlock_native_capacity && | |
401 | !(disk->flags & GENHD_FL_NATIVE_CAPACITY)) { | |
402 | printk(KERN_CONT "enabling native capacity\n"); | |
403 | bdops->unlock_native_capacity(disk); | |
404 | disk->flags |= GENHD_FL_NATIVE_CAPACITY; | |
405 | return true; | |
406 | } else { | |
407 | printk(KERN_CONT "truncated\n"); | |
408 | return false; | |
409 | } | |
410 | } | |
411 | ||
fe316bf2 | 412 | static int drop_partitions(struct gendisk *disk, struct block_device *bdev) |
94ea4158 | 413 | { |
94ea4158 AV |
414 | struct disk_part_iter piter; |
415 | struct hd_struct *part; | |
fe316bf2 | 416 | int res; |
94ea4158 | 417 | |
77032ca6 | 418 | if (bdev->bd_part_count || bdev->bd_super) |
94ea4158 AV |
419 | return -EBUSY; |
420 | res = invalidate_partition(disk, 0); | |
421 | if (res) | |
422 | return res; | |
423 | ||
424 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); | |
425 | while ((part = disk_part_iter_next(&piter))) | |
426 | delete_partition(disk, part->partno); | |
427 | disk_part_iter_exit(&piter); | |
428 | ||
fe316bf2 JN |
429 | return 0; |
430 | } | |
431 | ||
b02d8aae DLM |
432 | static bool part_zone_aligned(struct gendisk *disk, |
433 | struct block_device *bdev, | |
434 | sector_t from, sector_t size) | |
435 | { | |
f99e8648 | 436 | unsigned int zone_sectors = bdev_zone_sectors(bdev); |
b02d8aae DLM |
437 | |
438 | /* | |
439 | * If this function is called, then the disk is a zoned block device | |
440 | * (host-aware or host-managed). This can be detected even if the | |
441 | * zoned block device support is disabled (CONFIG_BLK_DEV_ZONED not | |
442 | * set). In this case, however, only host-aware devices will be seen | |
443 | * as a block device is not created for host-managed devices. Without | |
444 | * zoned block device support, host-aware drives can still be used as | |
445 | * regular block devices (no zone operation) and their zone size will | |
446 | * be reported as 0. Allow this case. | |
447 | */ | |
f99e8648 | 448 | if (!zone_sectors) |
b02d8aae DLM |
449 | return true; |
450 | ||
451 | /* | |
452 | * Check partition start and size alignement. If the drive has a | |
453 | * smaller last runt zone, ignore it and allow the partition to | |
454 | * use it. Check the zone size too: it should be a power of 2 number | |
455 | * of sectors. | |
456 | */ | |
f99e8648 | 457 | if (WARN_ON_ONCE(!is_power_of_2(zone_sectors))) { |
b02d8aae DLM |
458 | u32 rem; |
459 | ||
f99e8648 | 460 | div_u64_rem(from, zone_sectors, &rem); |
b02d8aae DLM |
461 | if (rem) |
462 | return false; | |
463 | if ((from + size) < get_capacity(disk)) { | |
f99e8648 | 464 | div_u64_rem(size, zone_sectors, &rem); |
b02d8aae DLM |
465 | if (rem) |
466 | return false; | |
467 | } | |
468 | ||
469 | } else { | |
470 | ||
f99e8648 | 471 | if (from & (zone_sectors - 1)) |
b02d8aae DLM |
472 | return false; |
473 | if ((from + size) < get_capacity(disk) && | |
f99e8648 | 474 | (size & (zone_sectors - 1))) |
b02d8aae DLM |
475 | return false; |
476 | ||
477 | } | |
478 | ||
479 | return true; | |
480 | } | |
481 | ||
fe316bf2 JN |
482 | int rescan_partitions(struct gendisk *disk, struct block_device *bdev) |
483 | { | |
484 | struct parsed_partitions *state = NULL; | |
485 | struct hd_struct *part; | |
486 | int p, highest, res; | |
487 | rescan: | |
488 | if (state && !IS_ERR(state)) { | |
ac2e5327 | 489 | free_partitions(state); |
fe316bf2 JN |
490 | state = NULL; |
491 | } | |
492 | ||
493 | res = drop_partitions(disk, bdev); | |
494 | if (res) | |
495 | return res; | |
496 | ||
94ea4158 AV |
497 | if (disk->fops->revalidate_disk) |
498 | disk->fops->revalidate_disk(disk); | |
499 | check_disk_size_change(disk, bdev); | |
500 | bdev->bd_invalidated = 0; | |
501 | if (!get_capacity(disk) || !(state = check_partition(disk, bdev))) | |
502 | return 0; | |
503 | if (IS_ERR(state)) { | |
504 | /* | |
505 | * I/O error reading the partition table. If any | |
506 | * partition code tried to read beyond EOD, retry | |
507 | * after unlocking native capacity. | |
508 | */ | |
509 | if (PTR_ERR(state) == -ENOSPC) { | |
510 | printk(KERN_WARNING "%s: partition table beyond EOD, ", | |
511 | disk->disk_name); | |
512 | if (disk_unlock_native_capacity(disk)) | |
513 | goto rescan; | |
514 | } | |
515 | return -EIO; | |
516 | } | |
517 | /* | |
518 | * If any partition code tried to read beyond EOD, try | |
519 | * unlocking native capacity even if partition table is | |
520 | * successfully read as we could be missing some partitions. | |
521 | */ | |
522 | if (state->access_beyond_eod) { | |
523 | printk(KERN_WARNING | |
524 | "%s: partition table partially beyond EOD, ", | |
525 | disk->disk_name); | |
526 | if (disk_unlock_native_capacity(disk)) | |
527 | goto rescan; | |
528 | } | |
529 | ||
530 | /* tell userspace that the media / partition table may have changed */ | |
531 | kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); | |
532 | ||
533 | /* Detect the highest partition number and preallocate | |
534 | * disk->part_tbl. This is an optimization and not strictly | |
535 | * necessary. | |
536 | */ | |
537 | for (p = 1, highest = 0; p < state->limit; p++) | |
538 | if (state->parts[p].size) | |
539 | highest = p; | |
540 | ||
541 | disk_expand_part_tbl(disk, highest); | |
542 | ||
543 | /* add partitions */ | |
544 | for (p = 1; p < state->limit; p++) { | |
545 | sector_t size, from; | |
94ea4158 AV |
546 | |
547 | size = state->parts[p].size; | |
548 | if (!size) | |
549 | continue; | |
550 | ||
551 | from = state->parts[p].from; | |
552 | if (from >= get_capacity(disk)) { | |
553 | printk(KERN_WARNING | |
554 | "%s: p%d start %llu is beyond EOD, ", | |
555 | disk->disk_name, p, (unsigned long long) from); | |
556 | if (disk_unlock_native_capacity(disk)) | |
557 | goto rescan; | |
558 | continue; | |
559 | } | |
560 | ||
561 | if (from + size > get_capacity(disk)) { | |
562 | printk(KERN_WARNING | |
563 | "%s: p%d size %llu extends beyond EOD, ", | |
564 | disk->disk_name, p, (unsigned long long) size); | |
565 | ||
566 | if (disk_unlock_native_capacity(disk)) { | |
567 | /* free state and restart */ | |
568 | goto rescan; | |
569 | } else { | |
570 | /* | |
571 | * we can not ignore partitions of broken tables | |
572 | * created by for example camera firmware, but | |
573 | * we limit them to the end of the disk to avoid | |
574 | * creating invalid block devices | |
575 | */ | |
576 | size = get_capacity(disk) - from; | |
577 | } | |
578 | } | |
579 | ||
b02d8aae DLM |
580 | /* |
581 | * On a zoned block device, partitions should be aligned on the | |
582 | * device zone size (i.e. zone boundary crossing not allowed). | |
583 | * Otherwise, resetting the write pointer of the last zone of | |
584 | * one partition may impact the following partition. | |
585 | */ | |
586 | if (bdev_is_zoned(bdev) && | |
587 | !part_zone_aligned(disk, bdev, from, size)) { | |
588 | printk(KERN_WARNING | |
589 | "%s: p%d start %llu+%llu is not zone aligned\n", | |
590 | disk->disk_name, p, (unsigned long long) from, | |
591 | (unsigned long long) size); | |
592 | continue; | |
593 | } | |
594 | ||
94ea4158 AV |
595 | part = add_partition(disk, p, from, size, |
596 | state->parts[p].flags, | |
597 | &state->parts[p].info); | |
598 | if (IS_ERR(part)) { | |
599 | printk(KERN_ERR " %s: p%d could not be added: %ld\n", | |
600 | disk->disk_name, p, -PTR_ERR(part)); | |
601 | continue; | |
602 | } | |
603 | #ifdef CONFIG_BLK_DEV_MD | |
604 | if (state->parts[p].flags & ADDPART_FLAG_RAID) | |
605 | md_autodetect_dev(part_to_dev(part)->devt); | |
606 | #endif | |
607 | } | |
ac2e5327 | 608 | free_partitions(state); |
94ea4158 AV |
609 | return 0; |
610 | } | |
611 | ||
fe316bf2 JN |
612 | int invalidate_partitions(struct gendisk *disk, struct block_device *bdev) |
613 | { | |
614 | int res; | |
615 | ||
616 | if (!bdev->bd_invalidated) | |
617 | return 0; | |
618 | ||
619 | res = drop_partitions(disk, bdev); | |
620 | if (res) | |
621 | return res; | |
622 | ||
623 | set_capacity(disk, 0); | |
624 | check_disk_size_change(disk, bdev); | |
625 | bdev->bd_invalidated = 0; | |
626 | /* tell userspace that the media / partition table may have changed */ | |
627 | kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); | |
628 | ||
629 | return 0; | |
630 | } | |
631 | ||
d1a5f2b4 DW |
632 | unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p) |
633 | { | |
a41fe02b | 634 | struct address_space *mapping = bdev->bd_inode->i_mapping; |
94ea4158 AV |
635 | struct page *page; |
636 | ||
a41fe02b | 637 | page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_SHIFT-9)), NULL); |
94ea4158 AV |
638 | if (!IS_ERR(page)) { |
639 | if (PageError(page)) | |
640 | goto fail; | |
641 | p->v = page; | |
09cbfeaf | 642 | return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_SHIFT - 9)) - 1)) << 9); |
94ea4158 | 643 | fail: |
09cbfeaf | 644 | put_page(page); |
94ea4158 AV |
645 | } |
646 | p->v = NULL; | |
647 | return NULL; | |
648 | } | |
649 | ||
650 | EXPORT_SYMBOL(read_dev_sector); |