Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
94ea4158 | 2 | /* |
387048bf CH |
3 | * Copyright (C) 1991-1998 Linus Torvalds |
4 | * Re-organised Feb 1998 Russell King | |
7b51e703 | 5 | * Copyright (C) 2020 Christoph Hellwig |
94ea4158 | 6 | */ |
94ea4158 AV |
7 | #include <linux/fs.h> |
8 | #include <linux/slab.h> | |
94ea4158 AV |
9 | #include <linux/ctype.h> |
10 | #include <linux/genhd.h> | |
387048bf | 11 | #include <linux/vmalloc.h> |
94ea4158 | 12 | #include <linux/blktrace_api.h> |
74cc979c | 13 | #include <linux/raid/detect.h> |
387048bf CH |
14 | #include "check.h" |
15 | ||
16 | static int (*check_part[])(struct parsed_partitions *) = { | |
17 | /* | |
18 | * Probe partition formats with tables at disk address 0 | |
19 | * that also have an ADFS boot block at 0xdc0. | |
20 | */ | |
21 | #ifdef CONFIG_ACORN_PARTITION_ICS | |
22 | adfspart_check_ICS, | |
23 | #endif | |
24 | #ifdef CONFIG_ACORN_PARTITION_POWERTEC | |
25 | adfspart_check_POWERTEC, | |
26 | #endif | |
27 | #ifdef CONFIG_ACORN_PARTITION_EESOX | |
28 | adfspart_check_EESOX, | |
29 | #endif | |
30 | ||
31 | /* | |
32 | * Now move on to formats that only have partition info at | |
33 | * disk address 0xdc0. Since these may also have stale | |
34 | * PC/BIOS partition tables, they need to come before | |
35 | * the msdos entry. | |
36 | */ | |
37 | #ifdef CONFIG_ACORN_PARTITION_CUMANA | |
38 | adfspart_check_CUMANA, | |
39 | #endif | |
40 | #ifdef CONFIG_ACORN_PARTITION_ADFS | |
41 | adfspart_check_ADFS, | |
42 | #endif | |
43 | ||
44 | #ifdef CONFIG_CMDLINE_PARTITION | |
45 | cmdline_partition, | |
46 | #endif | |
47 | #ifdef CONFIG_EFI_PARTITION | |
48 | efi_partition, /* this must come before msdos */ | |
49 | #endif | |
50 | #ifdef CONFIG_SGI_PARTITION | |
51 | sgi_partition, | |
52 | #endif | |
53 | #ifdef CONFIG_LDM_PARTITION | |
54 | ldm_partition, /* this must come before msdos */ | |
55 | #endif | |
56 | #ifdef CONFIG_MSDOS_PARTITION | |
57 | msdos_partition, | |
58 | #endif | |
59 | #ifdef CONFIG_OSF_PARTITION | |
60 | osf_partition, | |
61 | #endif | |
62 | #ifdef CONFIG_SUN_PARTITION | |
63 | sun_partition, | |
64 | #endif | |
65 | #ifdef CONFIG_AMIGA_PARTITION | |
66 | amiga_partition, | |
67 | #endif | |
68 | #ifdef CONFIG_ATARI_PARTITION | |
69 | atari_partition, | |
70 | #endif | |
71 | #ifdef CONFIG_MAC_PARTITION | |
72 | mac_partition, | |
73 | #endif | |
74 | #ifdef CONFIG_ULTRIX_PARTITION | |
75 | ultrix_partition, | |
76 | #endif | |
77 | #ifdef CONFIG_IBM_PARTITION | |
78 | ibm_partition, | |
79 | #endif | |
80 | #ifdef CONFIG_KARMA_PARTITION | |
81 | karma_partition, | |
82 | #endif | |
83 | #ifdef CONFIG_SYSV68_PARTITION | |
84 | sysv68_partition, | |
85 | #endif | |
86 | NULL | |
87 | }; | |
88 | ||
a782483c CH |
89 | static void bdev_set_nr_sectors(struct block_device *bdev, sector_t sectors) |
90 | { | |
0f472277 | 91 | spin_lock(&bdev->bd_size_lock); |
a782483c | 92 | i_size_write(bdev->bd_inode, (loff_t)sectors << SECTOR_SHIFT); |
0f472277 | 93 | spin_unlock(&bdev->bd_size_lock); |
a782483c CH |
94 | } |
95 | ||
387048bf CH |
96 | static struct parsed_partitions *allocate_partitions(struct gendisk *hd) |
97 | { | |
98 | struct parsed_partitions *state; | |
99 | int nr; | |
100 | ||
101 | state = kzalloc(sizeof(*state), GFP_KERNEL); | |
102 | if (!state) | |
103 | return NULL; | |
104 | ||
105 | nr = disk_max_parts(hd); | |
106 | state->parts = vzalloc(array_size(nr, sizeof(state->parts[0]))); | |
107 | if (!state->parts) { | |
108 | kfree(state); | |
109 | return NULL; | |
110 | } | |
111 | ||
112 | state->limit = nr; | |
113 | ||
114 | return state; | |
115 | } | |
116 | ||
117 | static void free_partitions(struct parsed_partitions *state) | |
118 | { | |
119 | vfree(state->parts); | |
120 | kfree(state); | |
121 | } | |
122 | ||
123 | static struct parsed_partitions *check_partition(struct gendisk *hd, | |
124 | struct block_device *bdev) | |
125 | { | |
126 | struct parsed_partitions *state; | |
127 | int i, res, err; | |
128 | ||
129 | state = allocate_partitions(hd); | |
130 | if (!state) | |
131 | return NULL; | |
132 | state->pp_buf = (char *)__get_free_page(GFP_KERNEL); | |
133 | if (!state->pp_buf) { | |
134 | free_partitions(state); | |
135 | return NULL; | |
136 | } | |
137 | state->pp_buf[0] = '\0'; | |
138 | ||
139 | state->bdev = bdev; | |
140 | disk_name(hd, 0, state->name); | |
141 | snprintf(state->pp_buf, PAGE_SIZE, " %s:", state->name); | |
142 | if (isdigit(state->name[strlen(state->name)-1])) | |
143 | sprintf(state->name, "p"); | |
144 | ||
145 | i = res = err = 0; | |
146 | while (!res && check_part[i]) { | |
147 | memset(state->parts, 0, state->limit * sizeof(state->parts[0])); | |
148 | res = check_part[i++](state); | |
149 | if (res < 0) { | |
150 | /* | |
151 | * We have hit an I/O error which we don't report now. | |
152 | * But record it, and let the others do their job. | |
153 | */ | |
154 | err = res; | |
155 | res = 0; | |
156 | } | |
157 | ||
158 | } | |
159 | if (res > 0) { | |
160 | printk(KERN_INFO "%s", state->pp_buf); | |
161 | ||
162 | free_page((unsigned long)state->pp_buf); | |
163 | return state; | |
164 | } | |
165 | if (state->access_beyond_eod) | |
166 | err = -ENOSPC; | |
167 | /* | |
168 | * The partition is unrecognized. So report I/O errors if there were any | |
169 | */ | |
170 | if (err) | |
171 | res = err; | |
172 | if (res) { | |
173 | strlcat(state->pp_buf, | |
174 | " unable to read partition table\n", PAGE_SIZE); | |
175 | printk(KERN_INFO "%s", state->pp_buf); | |
176 | } | |
94ea4158 | 177 | |
387048bf CH |
178 | free_page((unsigned long)state->pp_buf); |
179 | free_partitions(state); | |
180 | return ERR_PTR(res); | |
181 | } | |
94ea4158 | 182 | |
94ea4158 AV |
183 | static ssize_t part_partition_show(struct device *dev, |
184 | struct device_attribute *attr, char *buf) | |
185 | { | |
0d02129e | 186 | return sprintf(buf, "%d\n", dev_to_bdev(dev)->bd_partno); |
94ea4158 AV |
187 | } |
188 | ||
189 | static ssize_t part_start_show(struct device *dev, | |
190 | struct device_attribute *attr, char *buf) | |
191 | { | |
0d02129e | 192 | return sprintf(buf, "%llu\n", dev_to_bdev(dev)->bd_start_sect); |
94ea4158 AV |
193 | } |
194 | ||
94ea4158 AV |
195 | static ssize_t part_ro_show(struct device *dev, |
196 | struct device_attribute *attr, char *buf) | |
197 | { | |
52f019d4 | 198 | return sprintf(buf, "%d\n", bdev_read_only(dev_to_bdev(dev))); |
94ea4158 AV |
199 | } |
200 | ||
201 | static ssize_t part_alignment_offset_show(struct device *dev, | |
202 | struct device_attribute *attr, char *buf) | |
203 | { | |
0d02129e | 204 | struct block_device *bdev = dev_to_bdev(dev); |
7b8917f5 CH |
205 | |
206 | return sprintf(buf, "%u\n", | |
0d02129e CH |
207 | queue_limit_alignment_offset(&bdev->bd_disk->queue->limits, |
208 | bdev->bd_start_sect)); | |
94ea4158 AV |
209 | } |
210 | ||
211 | static ssize_t part_discard_alignment_show(struct device *dev, | |
212 | struct device_attribute *attr, char *buf) | |
213 | { | |
0d02129e | 214 | struct block_device *bdev = dev_to_bdev(dev); |
7cf34d97 CH |
215 | |
216 | return sprintf(buf, "%u\n", | |
0d02129e CH |
217 | queue_limit_discard_alignment(&bdev->bd_disk->queue->limits, |
218 | bdev->bd_start_sect)); | |
94ea4158 AV |
219 | } |
220 | ||
5657a819 JP |
221 | static DEVICE_ATTR(partition, 0444, part_partition_show, NULL); |
222 | static DEVICE_ATTR(start, 0444, part_start_show, NULL); | |
223 | static DEVICE_ATTR(size, 0444, part_size_show, NULL); | |
224 | static DEVICE_ATTR(ro, 0444, part_ro_show, NULL); | |
225 | static DEVICE_ATTR(alignment_offset, 0444, part_alignment_offset_show, NULL); | |
226 | static DEVICE_ATTR(discard_alignment, 0444, part_discard_alignment_show, NULL); | |
227 | static DEVICE_ATTR(stat, 0444, part_stat_show, NULL); | |
228 | static DEVICE_ATTR(inflight, 0444, part_inflight_show, NULL); | |
94ea4158 AV |
229 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
230 | static struct device_attribute dev_attr_fail = | |
5657a819 | 231 | __ATTR(make-it-fail, 0644, part_fail_show, part_fail_store); |
94ea4158 AV |
232 | #endif |
233 | ||
234 | static struct attribute *part_attrs[] = { | |
235 | &dev_attr_partition.attr, | |
236 | &dev_attr_start.attr, | |
237 | &dev_attr_size.attr, | |
238 | &dev_attr_ro.attr, | |
239 | &dev_attr_alignment_offset.attr, | |
240 | &dev_attr_discard_alignment.attr, | |
241 | &dev_attr_stat.attr, | |
242 | &dev_attr_inflight.attr, | |
243 | #ifdef CONFIG_FAIL_MAKE_REQUEST | |
244 | &dev_attr_fail.attr, | |
245 | #endif | |
246 | NULL | |
247 | }; | |
248 | ||
249 | static struct attribute_group part_attr_group = { | |
250 | .attrs = part_attrs, | |
251 | }; | |
252 | ||
253 | static const struct attribute_group *part_attr_groups[] = { | |
254 | &part_attr_group, | |
255 | #ifdef CONFIG_BLK_DEV_IO_TRACE | |
256 | &blk_trace_attr_group, | |
257 | #endif | |
258 | NULL | |
259 | }; | |
260 | ||
261 | static void part_release(struct device *dev) | |
262 | { | |
2da78092 | 263 | blk_free_devt(dev->devt); |
0d02129e | 264 | bdput(dev_to_bdev(dev)); |
94ea4158 AV |
265 | } |
266 | ||
0d9c51a6 SM |
267 | static int part_uevent(struct device *dev, struct kobj_uevent_env *env) |
268 | { | |
0d02129e | 269 | struct block_device *part = dev_to_bdev(dev); |
0d9c51a6 | 270 | |
0d02129e CH |
271 | add_uevent_var(env, "PARTN=%u", part->bd_partno); |
272 | if (part->bd_meta_info && part->bd_meta_info->volname[0]) | |
273 | add_uevent_var(env, "PARTNAME=%s", part->bd_meta_info->volname); | |
0d9c51a6 SM |
274 | return 0; |
275 | } | |
276 | ||
94ea4158 AV |
277 | struct device_type part_type = { |
278 | .name = "partition", | |
279 | .groups = part_attr_groups, | |
280 | .release = part_release, | |
0d9c51a6 | 281 | .uevent = part_uevent, |
94ea4158 AV |
282 | }; |
283 | ||
6d2cf6f2 BVA |
284 | /* |
285 | * Must be called either with bd_mutex held, before a disk can be opened or | |
286 | * after all disk users are gone. | |
287 | */ | |
d3c4a43d | 288 | static void delete_partition(struct block_device *part) |
94ea4158 | 289 | { |
473338be CH |
290 | fsync_bdev(part); |
291 | __invalidate_device(part, true); | |
292 | ||
a33df75c | 293 | xa_erase(&part->bd_disk->part_tbl, part->bd_partno); |
0d02129e CH |
294 | kobject_put(part->bd_holder_dir); |
295 | device_del(&part->bd_device); | |
94ea4158 | 296 | |
6fcc44d1 | 297 | /* |
22ae8ce8 CH |
298 | * Remove the block device from the inode hash, so that it cannot be |
299 | * looked up any more even when openers still hold references. | |
6fcc44d1 | 300 | */ |
0d02129e | 301 | remove_inode_hash(part->bd_inode); |
22ae8ce8 | 302 | |
0d02129e | 303 | put_device(&part->bd_device); |
94ea4158 AV |
304 | } |
305 | ||
306 | static ssize_t whole_disk_show(struct device *dev, | |
307 | struct device_attribute *attr, char *buf) | |
308 | { | |
309 | return 0; | |
310 | } | |
5657a819 | 311 | static DEVICE_ATTR(whole_disk, 0444, whole_disk_show, NULL); |
94ea4158 | 312 | |
6d2cf6f2 BVA |
313 | /* |
314 | * Must be called either with bd_mutex held, before a disk can be opened or | |
315 | * after all disk users are gone. | |
316 | */ | |
0d02129e | 317 | static struct block_device *add_partition(struct gendisk *disk, int partno, |
94ea4158 AV |
318 | sector_t start, sector_t len, int flags, |
319 | struct partition_meta_info *info) | |
320 | { | |
94ea4158 AV |
321 | dev_t devt = MKDEV(0, 0); |
322 | struct device *ddev = disk_to_dev(disk); | |
323 | struct device *pdev; | |
22ae8ce8 | 324 | struct block_device *bdev; |
94ea4158 AV |
325 | const char *dname; |
326 | int err; | |
327 | ||
e82fc785 ML |
328 | /* |
329 | * disk_max_parts() won't be zero, either GENHD_FL_EXT_DEVT is set | |
330 | * or 'minors' is passed to alloc_disk(). | |
331 | */ | |
332 | if (partno >= disk_max_parts(disk)) | |
333 | return ERR_PTR(-EINVAL); | |
334 | ||
b7205307 CH |
335 | /* |
336 | * Partitions are not supported on zoned block devices that are used as | |
337 | * such. | |
338 | */ | |
339 | switch (disk->queue->limits.zoned) { | |
340 | case BLK_ZONED_HM: | |
341 | pr_warn("%s: partitions not supported on host managed zoned block device\n", | |
342 | disk->disk_name); | |
343 | return ERR_PTR(-ENXIO); | |
344 | case BLK_ZONED_HA: | |
345 | pr_info("%s: disabling host aware zoned block device support due to partitions\n", | |
346 | disk->disk_name); | |
eafc63a9 | 347 | blk_queue_set_zoned(disk, BLK_ZONED_NONE); |
b7205307 CH |
348 | break; |
349 | case BLK_ZONED_NONE: | |
350 | break; | |
351 | } | |
352 | ||
a33df75c | 353 | if (xa_load(&disk->part_tbl, partno)) |
94ea4158 AV |
354 | return ERR_PTR(-EBUSY); |
355 | ||
22ae8ce8 CH |
356 | bdev = bdev_alloc(disk, partno); |
357 | if (!bdev) | |
cb8432d6 | 358 | return ERR_PTR(-ENOMEM); |
c83f6bf9 | 359 | |
29ff57c6 | 360 | bdev->bd_start_sect = start; |
a782483c | 361 | bdev_set_nr_sectors(bdev, len); |
94ea4158 AV |
362 | |
363 | if (info) { | |
231926db CH |
364 | err = -ENOMEM; |
365 | bdev->bd_meta_info = kmemdup(info, sizeof(*info), GFP_KERNEL); | |
366 | if (!bdev->bd_meta_info) | |
22ae8ce8 | 367 | goto out_bdput; |
94ea4158 AV |
368 | } |
369 | ||
0d02129e | 370 | pdev = &bdev->bd_device; |
94ea4158 AV |
371 | dname = dev_name(ddev); |
372 | if (isdigit(dname[strlen(dname) - 1])) | |
373 | dev_set_name(pdev, "%sp%d", dname, partno); | |
374 | else | |
375 | dev_set_name(pdev, "%s%d", dname, partno); | |
376 | ||
377 | device_initialize(pdev); | |
378 | pdev->class = &block_class; | |
379 | pdev->type = &part_type; | |
380 | pdev->parent = ddev; | |
381 | ||
9fc995a6 | 382 | err = blk_alloc_devt(bdev, &devt); |
94ea4158 | 383 | if (err) |
ef49d40b | 384 | goto out_put; |
94ea4158 AV |
385 | pdev->devt = devt; |
386 | ||
387 | /* delay uevent until 'holders' subdir is created */ | |
388 | dev_set_uevent_suppress(pdev, 1); | |
389 | err = device_add(pdev); | |
390 | if (err) | |
391 | goto out_put; | |
392 | ||
393 | err = -ENOMEM; | |
1bdd5ae0 CH |
394 | bdev->bd_holder_dir = kobject_create_and_add("holders", &pdev->kobj); |
395 | if (!bdev->bd_holder_dir) | |
94ea4158 AV |
396 | goto out_del; |
397 | ||
398 | dev_set_uevent_suppress(pdev, 0); | |
399 | if (flags & ADDPART_FLAG_WHOLEDISK) { | |
400 | err = device_create_file(pdev, &dev_attr_whole_disk); | |
401 | if (err) | |
402 | goto out_del; | |
403 | } | |
404 | ||
405 | /* everything is up and running, commence */ | |
a33df75c CH |
406 | err = xa_insert(&disk->part_tbl, partno, bdev, GFP_KERNEL); |
407 | if (err) | |
408 | goto out_del; | |
22ae8ce8 | 409 | bdev_add(bdev, devt); |
94ea4158 AV |
410 | |
411 | /* suppress uevent if the disk suppresses it */ | |
412 | if (!dev_get_uevent_suppress(ddev)) | |
413 | kobject_uevent(&pdev->kobj, KOBJ_ADD); | |
0d02129e | 414 | return bdev; |
94ea4158 | 415 | |
22ae8ce8 CH |
416 | out_bdput: |
417 | bdput(bdev); | |
94ea4158 AV |
418 | return ERR_PTR(err); |
419 | out_del: | |
1bdd5ae0 | 420 | kobject_put(bdev->bd_holder_dir); |
94ea4158 AV |
421 | device_del(pdev); |
422 | out_put: | |
423 | put_device(pdev); | |
94ea4158 AV |
424 | return ERR_PTR(err); |
425 | } | |
426 | ||
fa9156ae CH |
427 | static bool partition_overlaps(struct gendisk *disk, sector_t start, |
428 | sector_t length, int skip_partno) | |
429 | { | |
ad1eaa53 | 430 | struct block_device *part; |
fa9156ae | 431 | bool overlap = false; |
e3069123 CH |
432 | unsigned long idx; |
433 | ||
434 | rcu_read_lock(); | |
435 | xa_for_each_start(&disk->part_tbl, idx, part, 1) { | |
436 | if (part->bd_partno != skip_partno && | |
437 | start < part->bd_start_sect + bdev_nr_sectors(part) && | |
438 | start + length > part->bd_start_sect) { | |
439 | overlap = true; | |
440 | break; | |
441 | } | |
fa9156ae | 442 | } |
e3069123 | 443 | rcu_read_unlock(); |
fa9156ae | 444 | |
fa9156ae CH |
445 | return overlap; |
446 | } | |
447 | ||
448 | int bdev_add_partition(struct block_device *bdev, int partno, | |
449 | sector_t start, sector_t length) | |
450 | { | |
0d02129e | 451 | struct block_device *part; |
fa9156ae CH |
452 | |
453 | mutex_lock(&bdev->bd_mutex); | |
454 | if (partition_overlaps(bdev->bd_disk, start, length, -1)) { | |
455 | mutex_unlock(&bdev->bd_mutex); | |
456 | return -EBUSY; | |
457 | } | |
458 | ||
459 | part = add_partition(bdev->bd_disk, partno, start, length, | |
460 | ADDPART_FLAG_NONE, NULL); | |
461 | mutex_unlock(&bdev->bd_mutex); | |
462 | return PTR_ERR_OR_ZERO(part); | |
463 | } | |
464 | ||
465 | int bdev_del_partition(struct block_device *bdev, int partno) | |
466 | { | |
0d02129e | 467 | struct block_device *part; |
08fc1ab6 | 468 | int ret; |
fa9156ae | 469 | |
0d02129e CH |
470 | part = bdget_disk(bdev->bd_disk, partno); |
471 | if (!part) | |
88ce2a53 | 472 | return -ENXIO; |
fa9156ae | 473 | |
0d02129e | 474 | mutex_lock(&part->bd_mutex); |
08fc1ab6 CH |
475 | mutex_lock_nested(&bdev->bd_mutex, 1); |
476 | ||
fa9156ae | 477 | ret = -EBUSY; |
0d02129e | 478 | if (part->bd_openers) |
fa9156ae CH |
479 | goto out_unlock; |
480 | ||
8328eb28 | 481 | delete_partition(part); |
fa9156ae CH |
482 | ret = 0; |
483 | out_unlock: | |
08fc1ab6 | 484 | mutex_unlock(&bdev->bd_mutex); |
0d02129e CH |
485 | mutex_unlock(&part->bd_mutex); |
486 | bdput(part); | |
fa9156ae CH |
487 | return ret; |
488 | } | |
489 | ||
490 | int bdev_resize_partition(struct block_device *bdev, int partno, | |
491 | sector_t start, sector_t length) | |
492 | { | |
0d02129e | 493 | struct block_device *part; |
fa9156ae CH |
494 | int ret = 0; |
495 | ||
0d02129e | 496 | part = bdget_disk(bdev->bd_disk, partno); |
fa9156ae CH |
497 | if (!part) |
498 | return -ENXIO; | |
499 | ||
0d02129e | 500 | mutex_lock(&part->bd_mutex); |
fa9156ae | 501 | mutex_lock_nested(&bdev->bd_mutex, 1); |
fa9156ae | 502 | ret = -EINVAL; |
0d02129e | 503 | if (start != part->bd_start_sect) |
fa9156ae CH |
504 | goto out_unlock; |
505 | ||
506 | ret = -EBUSY; | |
507 | if (partition_overlaps(bdev->bd_disk, start, length, partno)) | |
508 | goto out_unlock; | |
509 | ||
0d02129e | 510 | bdev_set_nr_sectors(part, length); |
fa9156ae CH |
511 | |
512 | ret = 0; | |
513 | out_unlock: | |
0d02129e | 514 | mutex_unlock(&part->bd_mutex); |
fa9156ae | 515 | mutex_unlock(&bdev->bd_mutex); |
0d02129e | 516 | bdput(part); |
fa9156ae CH |
517 | return ret; |
518 | } | |
519 | ||
94ea4158 AV |
520 | static bool disk_unlock_native_capacity(struct gendisk *disk) |
521 | { | |
522 | const struct block_device_operations *bdops = disk->fops; | |
523 | ||
524 | if (bdops->unlock_native_capacity && | |
525 | !(disk->flags & GENHD_FL_NATIVE_CAPACITY)) { | |
526 | printk(KERN_CONT "enabling native capacity\n"); | |
527 | bdops->unlock_native_capacity(disk); | |
528 | disk->flags |= GENHD_FL_NATIVE_CAPACITY; | |
529 | return true; | |
530 | } else { | |
531 | printk(KERN_CONT "truncated\n"); | |
532 | return false; | |
533 | } | |
534 | } | |
535 | ||
d3c4a43d | 536 | void blk_drop_partitions(struct gendisk *disk) |
94ea4158 | 537 | { |
ad1eaa53 | 538 | struct block_device *part; |
6c4541a8 | 539 | unsigned long idx; |
94ea4158 | 540 | |
c76f48eb | 541 | lockdep_assert_held(&disk->part0->bd_mutex); |
e669c1da | 542 | |
6c4541a8 CH |
543 | xa_for_each_start(&disk->part_tbl, idx, part, 1) { |
544 | if (!bdgrab(part)) | |
545 | continue; | |
0d02129e | 546 | delete_partition(part); |
6c4541a8 CH |
547 | bdput(part); |
548 | } | |
fe316bf2 JN |
549 | } |
550 | ||
f902b026 CH |
551 | static bool blk_add_partition(struct gendisk *disk, struct block_device *bdev, |
552 | struct parsed_partitions *state, int p) | |
fe316bf2 | 553 | { |
f902b026 CH |
554 | sector_t size = state->parts[p].size; |
555 | sector_t from = state->parts[p].from; | |
0d02129e | 556 | struct block_device *part; |
f902b026 CH |
557 | |
558 | if (!size) | |
559 | return true; | |
560 | ||
561 | if (from >= get_capacity(disk)) { | |
562 | printk(KERN_WARNING | |
563 | "%s: p%d start %llu is beyond EOD, ", | |
564 | disk->disk_name, p, (unsigned long long) from); | |
565 | if (disk_unlock_native_capacity(disk)) | |
566 | return false; | |
567 | return true; | |
fe316bf2 JN |
568 | } |
569 | ||
f902b026 CH |
570 | if (from + size > get_capacity(disk)) { |
571 | printk(KERN_WARNING | |
572 | "%s: p%d size %llu extends beyond EOD, ", | |
573 | disk->disk_name, p, (unsigned long long) size); | |
fe316bf2 | 574 | |
f902b026 CH |
575 | if (disk_unlock_native_capacity(disk)) |
576 | return false; | |
577 | ||
578 | /* | |
579 | * We can not ignore partitions of broken tables created by for | |
580 | * example camera firmware, but we limit them to the end of the | |
581 | * disk to avoid creating invalid block devices. | |
582 | */ | |
583 | size = get_capacity(disk) - from; | |
584 | } | |
585 | ||
586 | part = add_partition(disk, p, from, size, state->parts[p].flags, | |
587 | &state->parts[p].info); | |
b7205307 | 588 | if (IS_ERR(part) && PTR_ERR(part) != -ENXIO) { |
f902b026 CH |
589 | printk(KERN_ERR " %s: p%d could not be added: %ld\n", |
590 | disk->disk_name, p, -PTR_ERR(part)); | |
591 | return true; | |
592 | } | |
593 | ||
74cc979c CH |
594 | if (IS_BUILTIN(CONFIG_BLK_DEV_MD) && |
595 | (state->parts[p].flags & ADDPART_FLAG_RAID)) | |
0d02129e | 596 | md_autodetect_dev(part->bd_dev); |
74cc979c | 597 | |
f902b026 CH |
598 | return true; |
599 | } | |
600 | ||
a1548b67 | 601 | int blk_add_partitions(struct gendisk *disk, struct block_device *bdev) |
f902b026 CH |
602 | { |
603 | struct parsed_partitions *state; | |
a33df75c | 604 | int ret = -EAGAIN, p; |
fe316bf2 | 605 | |
142fe8f4 CH |
606 | if (!disk_part_scan_enabled(disk)) |
607 | return 0; | |
608 | ||
f902b026 CH |
609 | state = check_partition(disk, bdev); |
610 | if (!state) | |
94ea4158 AV |
611 | return 0; |
612 | if (IS_ERR(state)) { | |
613 | /* | |
f902b026 CH |
614 | * I/O error reading the partition table. If we tried to read |
615 | * beyond EOD, retry after unlocking the native capacity. | |
94ea4158 AV |
616 | */ |
617 | if (PTR_ERR(state) == -ENOSPC) { | |
618 | printk(KERN_WARNING "%s: partition table beyond EOD, ", | |
619 | disk->disk_name); | |
620 | if (disk_unlock_native_capacity(disk)) | |
f902b026 | 621 | return -EAGAIN; |
94ea4158 AV |
622 | } |
623 | return -EIO; | |
624 | } | |
5eac3eb3 | 625 | |
f902b026 | 626 | /* |
b7205307 | 627 | * Partitions are not supported on host managed zoned block devices. |
f902b026 | 628 | */ |
b7205307 CH |
629 | if (disk->queue->limits.zoned == BLK_ZONED_HM) { |
630 | pr_warn("%s: ignoring partition table on host managed zoned block device\n", | |
5eac3eb3 | 631 | disk->disk_name); |
f902b026 CH |
632 | ret = 0; |
633 | goto out_free_state; | |
5eac3eb3 DLM |
634 | } |
635 | ||
94ea4158 | 636 | /* |
f902b026 CH |
637 | * If we read beyond EOD, try unlocking native capacity even if the |
638 | * partition table was successfully read as we could be missing some | |
639 | * partitions. | |
94ea4158 AV |
640 | */ |
641 | if (state->access_beyond_eod) { | |
642 | printk(KERN_WARNING | |
643 | "%s: partition table partially beyond EOD, ", | |
644 | disk->disk_name); | |
645 | if (disk_unlock_native_capacity(disk)) | |
f902b026 | 646 | goto out_free_state; |
94ea4158 AV |
647 | } |
648 | ||
649 | /* tell userspace that the media / partition table may have changed */ | |
650 | kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); | |
651 | ||
f902b026 CH |
652 | for (p = 1; p < state->limit; p++) |
653 | if (!blk_add_partition(disk, bdev, state, p)) | |
654 | goto out_free_state; | |
94ea4158 | 655 | |
f902b026 CH |
656 | ret = 0; |
657 | out_free_state: | |
ac2e5327 | 658 | free_partitions(state); |
f902b026 | 659 | return ret; |
fe316bf2 JN |
660 | } |
661 | ||
1a9fba3a | 662 | void *read_part_sector(struct parsed_partitions *state, sector_t n, Sector *p) |
d1a5f2b4 | 663 | { |
1a9fba3a | 664 | struct address_space *mapping = state->bdev->bd_inode->i_mapping; |
94ea4158 AV |
665 | struct page *page; |
666 | ||
1a9fba3a CH |
667 | if (n >= get_capacity(state->bdev->bd_disk)) { |
668 | state->access_beyond_eod = true; | |
669 | return NULL; | |
94ea4158 | 670 | } |
1a9fba3a CH |
671 | |
672 | page = read_mapping_page(mapping, | |
673 | (pgoff_t)(n >> (PAGE_SHIFT - 9)), NULL); | |
674 | if (IS_ERR(page)) | |
675 | goto out; | |
676 | if (PageError(page)) | |
677 | goto out_put_page; | |
678 | ||
679 | p->v = page; | |
680 | return (unsigned char *)page_address(page) + | |
681 | ((n & ((1 << (PAGE_SHIFT - 9)) - 1)) << SECTOR_SHIFT); | |
682 | out_put_page: | |
683 | put_page(page); | |
684 | out: | |
94ea4158 AV |
685 | p->v = NULL; |
686 | return NULL; | |
687 | } |