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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
94ea4158 AV |
2 | /* |
3 | * Code extracted from drivers/block/genhd.c | |
4 | * Copyright (C) 1991-1998 Linus Torvalds | |
5 | * Re-organised Feb 1998 Russell King | |
6 | * | |
7 | * We now have independent partition support from the | |
8 | * block drivers, which allows all the partition code to | |
9 | * be grouped in one location, and it to be mostly self | |
10 | * contained. | |
11 | */ | |
12 | ||
13 | #include <linux/init.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/fs.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/kmod.h> | |
18 | #include <linux/ctype.h> | |
19 | #include <linux/genhd.h> | |
20 | #include <linux/blktrace_api.h> | |
21 | ||
22 | #include "partitions/check.h" | |
23 | ||
24 | #ifdef CONFIG_BLK_DEV_MD | |
25 | extern void md_autodetect_dev(dev_t dev); | |
26 | #endif | |
27 | ||
28 | /* | |
29 | * disk_name() is used by partition check code and the genhd driver. | |
30 | * It formats the devicename of the indicated disk into | |
31 | * the supplied buffer (of size at least 32), and returns | |
32 | * a pointer to that same buffer (for convenience). | |
33 | */ | |
34 | ||
35 | char *disk_name(struct gendisk *hd, int partno, char *buf) | |
36 | { | |
37 | if (!partno) | |
38 | snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name); | |
39 | else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) | |
40 | snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, partno); | |
41 | else | |
42 | snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, partno); | |
43 | ||
44 | return buf; | |
45 | } | |
46 | ||
47 | const char *bdevname(struct block_device *bdev, char *buf) | |
48 | { | |
49 | return disk_name(bdev->bd_disk, bdev->bd_part->partno, buf); | |
50 | } | |
51 | ||
52 | EXPORT_SYMBOL(bdevname); | |
53 | ||
9c0fb1e3 JX |
54 | const char *bio_devname(struct bio *bio, char *buf) |
55 | { | |
56 | return disk_name(bio->bi_disk, bio->bi_partno, buf); | |
57 | } | |
58 | EXPORT_SYMBOL(bio_devname); | |
59 | ||
94ea4158 AV |
60 | /* |
61 | * There's very little reason to use this, you should really | |
62 | * have a struct block_device just about everywhere and use | |
63 | * bdevname() instead. | |
64 | */ | |
65 | const char *__bdevname(dev_t dev, char *buffer) | |
66 | { | |
67 | scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)", | |
68 | MAJOR(dev), MINOR(dev)); | |
69 | return buffer; | |
70 | } | |
71 | ||
72 | EXPORT_SYMBOL(__bdevname); | |
73 | ||
74 | static ssize_t part_partition_show(struct device *dev, | |
75 | struct device_attribute *attr, char *buf) | |
76 | { | |
77 | struct hd_struct *p = dev_to_part(dev); | |
78 | ||
79 | return sprintf(buf, "%d\n", p->partno); | |
80 | } | |
81 | ||
82 | static ssize_t part_start_show(struct device *dev, | |
83 | struct device_attribute *attr, char *buf) | |
84 | { | |
85 | struct hd_struct *p = dev_to_part(dev); | |
86 | ||
87 | return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect); | |
88 | } | |
89 | ||
90 | ssize_t part_size_show(struct device *dev, | |
91 | struct device_attribute *attr, char *buf) | |
92 | { | |
93 | struct hd_struct *p = dev_to_part(dev); | |
c83f6bf9 | 94 | return sprintf(buf, "%llu\n",(unsigned long long)part_nr_sects_read(p)); |
94ea4158 AV |
95 | } |
96 | ||
97 | static ssize_t part_ro_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, "%d\n", p->policy ? 1 : 0); | |
102 | } | |
103 | ||
104 | static ssize_t part_alignment_offset_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, "%llu\n", (unsigned long long)p->alignment_offset); | |
109 | } | |
110 | ||
111 | static ssize_t part_discard_alignment_show(struct device *dev, | |
112 | struct device_attribute *attr, char *buf) | |
113 | { | |
114 | struct hd_struct *p = dev_to_part(dev); | |
115 | return sprintf(buf, "%u\n", p->discard_alignment); | |
116 | } | |
117 | ||
118 | ssize_t part_stat_show(struct device *dev, | |
119 | struct device_attribute *attr, char *buf) | |
120 | { | |
121 | struct hd_struct *p = dev_to_part(dev); | |
f5c156c4 | 122 | struct request_queue *q = part_to_disk(p)->queue; |
e016b782 | 123 | unsigned int inflight; |
94ea4158 | 124 | |
e016b782 | 125 | inflight = part_in_flight(q, p); |
94ea4158 AV |
126 | return sprintf(buf, |
127 | "%8lu %8lu %8llu %8u " | |
128 | "%8lu %8lu %8llu %8u " | |
bdca3c87 MC |
129 | "%8u %8u %8u " |
130 | "%8lu %8lu %8llu %8u" | |
94ea4158 | 131 | "\n", |
dbae2c55 MC |
132 | part_stat_read(p, ios[STAT_READ]), |
133 | part_stat_read(p, merges[STAT_READ]), | |
134 | (unsigned long long)part_stat_read(p, sectors[STAT_READ]), | |
b57e99b4 | 135 | (unsigned int)part_stat_read_msecs(p, STAT_READ), |
dbae2c55 MC |
136 | part_stat_read(p, ios[STAT_WRITE]), |
137 | part_stat_read(p, merges[STAT_WRITE]), | |
138 | (unsigned long long)part_stat_read(p, sectors[STAT_WRITE]), | |
b57e99b4 | 139 | (unsigned int)part_stat_read_msecs(p, STAT_WRITE), |
e016b782 | 140 | inflight, |
94ea4158 | 141 | jiffies_to_msecs(part_stat_read(p, io_ticks)), |
bdca3c87 MC |
142 | jiffies_to_msecs(part_stat_read(p, time_in_queue)), |
143 | part_stat_read(p, ios[STAT_DISCARD]), | |
144 | part_stat_read(p, merges[STAT_DISCARD]), | |
145 | (unsigned long long)part_stat_read(p, sectors[STAT_DISCARD]), | |
b57e99b4 | 146 | (unsigned int)part_stat_read_msecs(p, STAT_DISCARD)); |
94ea4158 AV |
147 | } |
148 | ||
bf0ddaba OS |
149 | ssize_t part_inflight_show(struct device *dev, struct device_attribute *attr, |
150 | char *buf) | |
94ea4158 AV |
151 | { |
152 | struct hd_struct *p = dev_to_part(dev); | |
bf0ddaba OS |
153 | struct request_queue *q = part_to_disk(p)->queue; |
154 | unsigned int inflight[2]; | |
94ea4158 | 155 | |
bf0ddaba OS |
156 | part_in_flight_rw(q, p, inflight); |
157 | return sprintf(buf, "%8u %8u\n", inflight[0], inflight[1]); | |
94ea4158 AV |
158 | } |
159 | ||
160 | #ifdef CONFIG_FAIL_MAKE_REQUEST | |
161 | ssize_t part_fail_show(struct device *dev, | |
162 | struct device_attribute *attr, char *buf) | |
163 | { | |
164 | struct hd_struct *p = dev_to_part(dev); | |
165 | ||
166 | return sprintf(buf, "%d\n", p->make_it_fail); | |
167 | } | |
168 | ||
169 | ssize_t part_fail_store(struct device *dev, | |
170 | struct device_attribute *attr, | |
171 | const char *buf, size_t count) | |
172 | { | |
173 | struct hd_struct *p = dev_to_part(dev); | |
174 | int i; | |
175 | ||
176 | if (count > 0 && sscanf(buf, "%d", &i) > 0) | |
177 | p->make_it_fail = (i == 0) ? 0 : 1; | |
178 | ||
179 | return count; | |
180 | } | |
181 | #endif | |
182 | ||
5657a819 JP |
183 | static DEVICE_ATTR(partition, 0444, part_partition_show, NULL); |
184 | static DEVICE_ATTR(start, 0444, part_start_show, NULL); | |
185 | static DEVICE_ATTR(size, 0444, part_size_show, NULL); | |
186 | static DEVICE_ATTR(ro, 0444, part_ro_show, NULL); | |
187 | static DEVICE_ATTR(alignment_offset, 0444, part_alignment_offset_show, NULL); | |
188 | static DEVICE_ATTR(discard_alignment, 0444, part_discard_alignment_show, NULL); | |
189 | static DEVICE_ATTR(stat, 0444, part_stat_show, NULL); | |
190 | static DEVICE_ATTR(inflight, 0444, part_inflight_show, NULL); | |
94ea4158 AV |
191 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
192 | static struct device_attribute dev_attr_fail = | |
5657a819 | 193 | __ATTR(make-it-fail, 0644, part_fail_show, part_fail_store); |
94ea4158 AV |
194 | #endif |
195 | ||
196 | static struct attribute *part_attrs[] = { | |
197 | &dev_attr_partition.attr, | |
198 | &dev_attr_start.attr, | |
199 | &dev_attr_size.attr, | |
200 | &dev_attr_ro.attr, | |
201 | &dev_attr_alignment_offset.attr, | |
202 | &dev_attr_discard_alignment.attr, | |
203 | &dev_attr_stat.attr, | |
204 | &dev_attr_inflight.attr, | |
205 | #ifdef CONFIG_FAIL_MAKE_REQUEST | |
206 | &dev_attr_fail.attr, | |
207 | #endif | |
208 | NULL | |
209 | }; | |
210 | ||
211 | static struct attribute_group part_attr_group = { | |
212 | .attrs = part_attrs, | |
213 | }; | |
214 | ||
215 | static const struct attribute_group *part_attr_groups[] = { | |
216 | &part_attr_group, | |
217 | #ifdef CONFIG_BLK_DEV_IO_TRACE | |
218 | &blk_trace_attr_group, | |
219 | #endif | |
220 | NULL | |
221 | }; | |
222 | ||
223 | static void part_release(struct device *dev) | |
224 | { | |
225 | struct hd_struct *p = dev_to_part(dev); | |
2da78092 | 226 | blk_free_devt(dev->devt); |
b54e5ed8 | 227 | hd_free_part(p); |
94ea4158 AV |
228 | kfree(p); |
229 | } | |
230 | ||
0d9c51a6 SM |
231 | static int part_uevent(struct device *dev, struct kobj_uevent_env *env) |
232 | { | |
233 | struct hd_struct *part = dev_to_part(dev); | |
234 | ||
235 | add_uevent_var(env, "PARTN=%u", part->partno); | |
236 | if (part->info && part->info->volname[0]) | |
237 | add_uevent_var(env, "PARTNAME=%s", part->info->volname); | |
238 | return 0; | |
239 | } | |
240 | ||
94ea4158 AV |
241 | struct device_type part_type = { |
242 | .name = "partition", | |
243 | .groups = part_attr_groups, | |
244 | .release = part_release, | |
0d9c51a6 | 245 | .uevent = part_uevent, |
94ea4158 AV |
246 | }; |
247 | ||
94a2c3a3 | 248 | static void delete_partition_work_fn(struct work_struct *work) |
94ea4158 | 249 | { |
94a2c3a3 YY |
250 | struct hd_struct *part = container_of(to_rcu_work(work), struct hd_struct, |
251 | rcu_work); | |
94ea4158 AV |
252 | |
253 | part->start_sect = 0; | |
254 | part->nr_sects = 0; | |
255 | part_stat_set_all(part, 0); | |
256 | put_device(part_to_dev(part)); | |
257 | } | |
258 | ||
6c71013e | 259 | void __delete_partition(struct percpu_ref *ref) |
94ea4158 | 260 | { |
6c71013e | 261 | struct hd_struct *part = container_of(ref, struct hd_struct, ref); |
94a2c3a3 YY |
262 | INIT_RCU_WORK(&part->rcu_work, delete_partition_work_fn); |
263 | queue_rcu_work(system_wq, &part->rcu_work); | |
94ea4158 AV |
264 | } |
265 | ||
6d2cf6f2 BVA |
266 | /* |
267 | * Must be called either with bd_mutex held, before a disk can be opened or | |
268 | * after all disk users are gone. | |
269 | */ | |
94ea4158 AV |
270 | void delete_partition(struct gendisk *disk, int partno) |
271 | { | |
6d2cf6f2 BVA |
272 | struct disk_part_tbl *ptbl = |
273 | rcu_dereference_protected(disk->part_tbl, 1); | |
94ea4158 AV |
274 | struct hd_struct *part; |
275 | ||
276 | if (partno >= ptbl->len) | |
277 | return; | |
278 | ||
6d2cf6f2 | 279 | part = rcu_dereference_protected(ptbl->part[partno], 1); |
94ea4158 AV |
280 | if (!part) |
281 | return; | |
282 | ||
94ea4158 AV |
283 | rcu_assign_pointer(ptbl->part[partno], NULL); |
284 | rcu_assign_pointer(ptbl->last_lookup, NULL); | |
285 | kobject_put(part->holder_dir); | |
286 | device_del(part_to_dev(part)); | |
287 | ||
6fcc44d1 YY |
288 | /* |
289 | * Remove gendisk pointer from idr so that it cannot be looked up | |
290 | * while RCU period before freeing gendisk is running to prevent | |
291 | * use-after-free issues. Note that the device number stays | |
292 | * "in-use" until we really free the gendisk. | |
293 | */ | |
294 | blk_invalidate_devt(part_devt(part)); | |
6c71013e | 295 | hd_struct_kill(part); |
94ea4158 AV |
296 | } |
297 | ||
298 | static ssize_t whole_disk_show(struct device *dev, | |
299 | struct device_attribute *attr, char *buf) | |
300 | { | |
301 | return 0; | |
302 | } | |
5657a819 | 303 | static DEVICE_ATTR(whole_disk, 0444, whole_disk_show, NULL); |
94ea4158 | 304 | |
6d2cf6f2 BVA |
305 | /* |
306 | * Must be called either with bd_mutex held, before a disk can be opened or | |
307 | * after all disk users are gone. | |
308 | */ | |
94ea4158 AV |
309 | struct hd_struct *add_partition(struct gendisk *disk, int partno, |
310 | sector_t start, sector_t len, int flags, | |
311 | struct partition_meta_info *info) | |
312 | { | |
313 | struct hd_struct *p; | |
314 | dev_t devt = MKDEV(0, 0); | |
315 | struct device *ddev = disk_to_dev(disk); | |
316 | struct device *pdev; | |
317 | struct disk_part_tbl *ptbl; | |
318 | const char *dname; | |
319 | int err; | |
320 | ||
321 | err = disk_expand_part_tbl(disk, partno); | |
322 | if (err) | |
323 | return ERR_PTR(err); | |
6d2cf6f2 | 324 | ptbl = rcu_dereference_protected(disk->part_tbl, 1); |
94ea4158 AV |
325 | |
326 | if (ptbl->part[partno]) | |
327 | return ERR_PTR(-EBUSY); | |
328 | ||
329 | p = kzalloc(sizeof(*p), GFP_KERNEL); | |
330 | if (!p) | |
331 | return ERR_PTR(-EBUSY); | |
332 | ||
333 | if (!init_part_stats(p)) { | |
334 | err = -ENOMEM; | |
335 | goto out_free; | |
336 | } | |
c83f6bf9 VG |
337 | |
338 | seqcount_init(&p->nr_sects_seq); | |
94ea4158 AV |
339 | pdev = part_to_dev(p); |
340 | ||
341 | p->start_sect = start; | |
342 | p->alignment_offset = | |
343 | queue_limit_alignment_offset(&disk->queue->limits, start); | |
344 | p->discard_alignment = | |
345 | queue_limit_discard_alignment(&disk->queue->limits, start); | |
346 | p->nr_sects = len; | |
347 | p->partno = partno; | |
348 | p->policy = get_disk_ro(disk); | |
349 | ||
350 | if (info) { | |
351 | struct partition_meta_info *pinfo = alloc_part_info(disk); | |
7bd897cf DC |
352 | if (!pinfo) { |
353 | err = -ENOMEM; | |
94ea4158 | 354 | goto out_free_stats; |
7bd897cf | 355 | } |
94ea4158 AV |
356 | memcpy(pinfo, info, sizeof(*info)); |
357 | p->info = pinfo; | |
358 | } | |
359 | ||
360 | dname = dev_name(ddev); | |
361 | if (isdigit(dname[strlen(dname) - 1])) | |
362 | dev_set_name(pdev, "%sp%d", dname, partno); | |
363 | else | |
364 | dev_set_name(pdev, "%s%d", dname, partno); | |
365 | ||
366 | device_initialize(pdev); | |
367 | pdev->class = &block_class; | |
368 | pdev->type = &part_type; | |
369 | pdev->parent = ddev; | |
370 | ||
371 | err = blk_alloc_devt(p, &devt); | |
372 | if (err) | |
373 | goto out_free_info; | |
374 | pdev->devt = devt; | |
375 | ||
376 | /* delay uevent until 'holders' subdir is created */ | |
377 | dev_set_uevent_suppress(pdev, 1); | |
378 | err = device_add(pdev); | |
379 | if (err) | |
380 | goto out_put; | |
381 | ||
382 | err = -ENOMEM; | |
383 | p->holder_dir = kobject_create_and_add("holders", &pdev->kobj); | |
384 | if (!p->holder_dir) | |
385 | goto out_del; | |
386 | ||
387 | dev_set_uevent_suppress(pdev, 0); | |
388 | if (flags & ADDPART_FLAG_WHOLEDISK) { | |
389 | err = device_create_file(pdev, &dev_attr_whole_disk); | |
390 | if (err) | |
391 | goto out_del; | |
392 | } | |
393 | ||
b30a337c ML |
394 | err = hd_ref_init(p); |
395 | if (err) { | |
396 | if (flags & ADDPART_FLAG_WHOLEDISK) | |
397 | goto out_remove_file; | |
398 | goto out_del; | |
399 | } | |
400 | ||
94ea4158 AV |
401 | /* everything is up and running, commence */ |
402 | rcu_assign_pointer(ptbl->part[partno], p); | |
403 | ||
404 | /* suppress uevent if the disk suppresses it */ | |
405 | if (!dev_get_uevent_suppress(ddev)) | |
406 | kobject_uevent(&pdev->kobj, KOBJ_ADD); | |
b30a337c | 407 | return p; |
94ea4158 AV |
408 | |
409 | out_free_info: | |
410 | free_part_info(p); | |
411 | out_free_stats: | |
412 | free_part_stats(p); | |
413 | out_free: | |
414 | kfree(p); | |
415 | return ERR_PTR(err); | |
b30a337c ML |
416 | out_remove_file: |
417 | device_remove_file(pdev, &dev_attr_whole_disk); | |
94ea4158 AV |
418 | out_del: |
419 | kobject_put(p->holder_dir); | |
420 | device_del(pdev); | |
421 | out_put: | |
422 | put_device(pdev); | |
94ea4158 AV |
423 | return ERR_PTR(err); |
424 | } | |
425 | ||
426 | static bool disk_unlock_native_capacity(struct gendisk *disk) | |
427 | { | |
428 | const struct block_device_operations *bdops = disk->fops; | |
429 | ||
430 | if (bdops->unlock_native_capacity && | |
431 | !(disk->flags & GENHD_FL_NATIVE_CAPACITY)) { | |
432 | printk(KERN_CONT "enabling native capacity\n"); | |
433 | bdops->unlock_native_capacity(disk); | |
434 | disk->flags |= GENHD_FL_NATIVE_CAPACITY; | |
435 | return true; | |
436 | } else { | |
437 | printk(KERN_CONT "truncated\n"); | |
438 | return false; | |
439 | } | |
440 | } | |
441 | ||
fe316bf2 | 442 | static int drop_partitions(struct gendisk *disk, struct block_device *bdev) |
94ea4158 | 443 | { |
94ea4158 AV |
444 | struct disk_part_iter piter; |
445 | struct hd_struct *part; | |
fe316bf2 | 446 | int res; |
94ea4158 | 447 | |
77032ca6 | 448 | if (bdev->bd_part_count || bdev->bd_super) |
94ea4158 AV |
449 | return -EBUSY; |
450 | res = invalidate_partition(disk, 0); | |
451 | if (res) | |
452 | return res; | |
453 | ||
454 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); | |
455 | while ((part = disk_part_iter_next(&piter))) | |
456 | delete_partition(disk, part->partno); | |
457 | disk_part_iter_exit(&piter); | |
458 | ||
fe316bf2 JN |
459 | return 0; |
460 | } | |
461 | ||
b02d8aae DLM |
462 | static bool part_zone_aligned(struct gendisk *disk, |
463 | struct block_device *bdev, | |
464 | sector_t from, sector_t size) | |
465 | { | |
f99e8648 | 466 | unsigned int zone_sectors = bdev_zone_sectors(bdev); |
b02d8aae DLM |
467 | |
468 | /* | |
469 | * If this function is called, then the disk is a zoned block device | |
470 | * (host-aware or host-managed). This can be detected even if the | |
471 | * zoned block device support is disabled (CONFIG_BLK_DEV_ZONED not | |
472 | * set). In this case, however, only host-aware devices will be seen | |
473 | * as a block device is not created for host-managed devices. Without | |
474 | * zoned block device support, host-aware drives can still be used as | |
475 | * regular block devices (no zone operation) and their zone size will | |
476 | * be reported as 0. Allow this case. | |
477 | */ | |
f99e8648 | 478 | if (!zone_sectors) |
b02d8aae DLM |
479 | return true; |
480 | ||
481 | /* | |
482 | * Check partition start and size alignement. If the drive has a | |
483 | * smaller last runt zone, ignore it and allow the partition to | |
484 | * use it. Check the zone size too: it should be a power of 2 number | |
485 | * of sectors. | |
486 | */ | |
f99e8648 | 487 | if (WARN_ON_ONCE(!is_power_of_2(zone_sectors))) { |
b02d8aae DLM |
488 | u32 rem; |
489 | ||
f99e8648 | 490 | div_u64_rem(from, zone_sectors, &rem); |
b02d8aae DLM |
491 | if (rem) |
492 | return false; | |
493 | if ((from + size) < get_capacity(disk)) { | |
f99e8648 | 494 | div_u64_rem(size, zone_sectors, &rem); |
b02d8aae DLM |
495 | if (rem) |
496 | return false; | |
497 | } | |
498 | ||
499 | } else { | |
500 | ||
f99e8648 | 501 | if (from & (zone_sectors - 1)) |
b02d8aae DLM |
502 | return false; |
503 | if ((from + size) < get_capacity(disk) && | |
f99e8648 | 504 | (size & (zone_sectors - 1))) |
b02d8aae DLM |
505 | return false; |
506 | ||
507 | } | |
508 | ||
509 | return true; | |
510 | } | |
511 | ||
fe316bf2 JN |
512 | int rescan_partitions(struct gendisk *disk, struct block_device *bdev) |
513 | { | |
514 | struct parsed_partitions *state = NULL; | |
515 | struct hd_struct *part; | |
516 | int p, highest, res; | |
517 | rescan: | |
518 | if (state && !IS_ERR(state)) { | |
ac2e5327 | 519 | free_partitions(state); |
fe316bf2 JN |
520 | state = NULL; |
521 | } | |
522 | ||
523 | res = drop_partitions(disk, bdev); | |
524 | if (res) | |
525 | return res; | |
526 | ||
94ea4158 AV |
527 | if (disk->fops->revalidate_disk) |
528 | disk->fops->revalidate_disk(disk); | |
5afb7835 | 529 | check_disk_size_change(disk, bdev, true); |
94ea4158 AV |
530 | bdev->bd_invalidated = 0; |
531 | if (!get_capacity(disk) || !(state = check_partition(disk, bdev))) | |
532 | return 0; | |
533 | if (IS_ERR(state)) { | |
534 | /* | |
535 | * I/O error reading the partition table. If any | |
536 | * partition code tried to read beyond EOD, retry | |
537 | * after unlocking native capacity. | |
538 | */ | |
539 | if (PTR_ERR(state) == -ENOSPC) { | |
540 | printk(KERN_WARNING "%s: partition table beyond EOD, ", | |
541 | disk->disk_name); | |
542 | if (disk_unlock_native_capacity(disk)) | |
543 | goto rescan; | |
544 | } | |
545 | return -EIO; | |
546 | } | |
547 | /* | |
548 | * If any partition code tried to read beyond EOD, try | |
549 | * unlocking native capacity even if partition table is | |
550 | * successfully read as we could be missing some partitions. | |
551 | */ | |
552 | if (state->access_beyond_eod) { | |
553 | printk(KERN_WARNING | |
554 | "%s: partition table partially beyond EOD, ", | |
555 | disk->disk_name); | |
556 | if (disk_unlock_native_capacity(disk)) | |
557 | goto rescan; | |
558 | } | |
559 | ||
560 | /* tell userspace that the media / partition table may have changed */ | |
561 | kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); | |
562 | ||
563 | /* Detect the highest partition number and preallocate | |
564 | * disk->part_tbl. This is an optimization and not strictly | |
565 | * necessary. | |
566 | */ | |
567 | for (p = 1, highest = 0; p < state->limit; p++) | |
568 | if (state->parts[p].size) | |
569 | highest = p; | |
570 | ||
571 | disk_expand_part_tbl(disk, highest); | |
572 | ||
573 | /* add partitions */ | |
574 | for (p = 1; p < state->limit; p++) { | |
575 | sector_t size, from; | |
94ea4158 AV |
576 | |
577 | size = state->parts[p].size; | |
578 | if (!size) | |
579 | continue; | |
580 | ||
581 | from = state->parts[p].from; | |
582 | if (from >= get_capacity(disk)) { | |
583 | printk(KERN_WARNING | |
584 | "%s: p%d start %llu is beyond EOD, ", | |
585 | disk->disk_name, p, (unsigned long long) from); | |
586 | if (disk_unlock_native_capacity(disk)) | |
587 | goto rescan; | |
588 | continue; | |
589 | } | |
590 | ||
591 | if (from + size > get_capacity(disk)) { | |
592 | printk(KERN_WARNING | |
593 | "%s: p%d size %llu extends beyond EOD, ", | |
594 | disk->disk_name, p, (unsigned long long) size); | |
595 | ||
596 | if (disk_unlock_native_capacity(disk)) { | |
597 | /* free state and restart */ | |
598 | goto rescan; | |
599 | } else { | |
600 | /* | |
601 | * we can not ignore partitions of broken tables | |
602 | * created by for example camera firmware, but | |
603 | * we limit them to the end of the disk to avoid | |
604 | * creating invalid block devices | |
605 | */ | |
606 | size = get_capacity(disk) - from; | |
607 | } | |
608 | } | |
609 | ||
b02d8aae DLM |
610 | /* |
611 | * On a zoned block device, partitions should be aligned on the | |
612 | * device zone size (i.e. zone boundary crossing not allowed). | |
613 | * Otherwise, resetting the write pointer of the last zone of | |
614 | * one partition may impact the following partition. | |
615 | */ | |
616 | if (bdev_is_zoned(bdev) && | |
617 | !part_zone_aligned(disk, bdev, from, size)) { | |
618 | printk(KERN_WARNING | |
619 | "%s: p%d start %llu+%llu is not zone aligned\n", | |
620 | disk->disk_name, p, (unsigned long long) from, | |
621 | (unsigned long long) size); | |
622 | continue; | |
623 | } | |
624 | ||
94ea4158 AV |
625 | part = add_partition(disk, p, from, size, |
626 | state->parts[p].flags, | |
627 | &state->parts[p].info); | |
628 | if (IS_ERR(part)) { | |
629 | printk(KERN_ERR " %s: p%d could not be added: %ld\n", | |
630 | disk->disk_name, p, -PTR_ERR(part)); | |
631 | continue; | |
632 | } | |
633 | #ifdef CONFIG_BLK_DEV_MD | |
634 | if (state->parts[p].flags & ADDPART_FLAG_RAID) | |
635 | md_autodetect_dev(part_to_dev(part)->devt); | |
636 | #endif | |
637 | } | |
ac2e5327 | 638 | free_partitions(state); |
94ea4158 AV |
639 | return 0; |
640 | } | |
641 | ||
fe316bf2 JN |
642 | int invalidate_partitions(struct gendisk *disk, struct block_device *bdev) |
643 | { | |
644 | int res; | |
645 | ||
646 | if (!bdev->bd_invalidated) | |
647 | return 0; | |
648 | ||
649 | res = drop_partitions(disk, bdev); | |
650 | if (res) | |
651 | return res; | |
652 | ||
653 | set_capacity(disk, 0); | |
5afb7835 | 654 | check_disk_size_change(disk, bdev, false); |
fe316bf2 JN |
655 | bdev->bd_invalidated = 0; |
656 | /* tell userspace that the media / partition table may have changed */ | |
657 | kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); | |
658 | ||
659 | return 0; | |
660 | } | |
661 | ||
d1a5f2b4 DW |
662 | unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p) |
663 | { | |
a41fe02b | 664 | struct address_space *mapping = bdev->bd_inode->i_mapping; |
94ea4158 AV |
665 | struct page *page; |
666 | ||
a41fe02b | 667 | page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_SHIFT-9)), NULL); |
94ea4158 AV |
668 | if (!IS_ERR(page)) { |
669 | if (PageError(page)) | |
670 | goto fail; | |
671 | p->v = page; | |
09cbfeaf | 672 | return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_SHIFT - 9)) - 1)) << 9); |
94ea4158 | 673 | fail: |
09cbfeaf | 674 | put_page(page); |
94ea4158 AV |
675 | } |
676 | p->v = NULL; | |
677 | return NULL; | |
678 | } | |
679 | ||
680 | EXPORT_SYMBOL(read_dev_sector); |