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 | |
94ea4158 | 5 | */ |
94ea4158 AV |
6 | #include <linux/fs.h> |
7 | #include <linux/slab.h> | |
94ea4158 AV |
8 | #include <linux/ctype.h> |
9 | #include <linux/genhd.h> | |
387048bf | 10 | #include <linux/vmalloc.h> |
94ea4158 | 11 | #include <linux/blktrace_api.h> |
74cc979c | 12 | #include <linux/raid/detect.h> |
387048bf CH |
13 | #include "check.h" |
14 | ||
15 | static int (*check_part[])(struct parsed_partitions *) = { | |
16 | /* | |
17 | * Probe partition formats with tables at disk address 0 | |
18 | * that also have an ADFS boot block at 0xdc0. | |
19 | */ | |
20 | #ifdef CONFIG_ACORN_PARTITION_ICS | |
21 | adfspart_check_ICS, | |
22 | #endif | |
23 | #ifdef CONFIG_ACORN_PARTITION_POWERTEC | |
24 | adfspart_check_POWERTEC, | |
25 | #endif | |
26 | #ifdef CONFIG_ACORN_PARTITION_EESOX | |
27 | adfspart_check_EESOX, | |
28 | #endif | |
29 | ||
30 | /* | |
31 | * Now move on to formats that only have partition info at | |
32 | * disk address 0xdc0. Since these may also have stale | |
33 | * PC/BIOS partition tables, they need to come before | |
34 | * the msdos entry. | |
35 | */ | |
36 | #ifdef CONFIG_ACORN_PARTITION_CUMANA | |
37 | adfspart_check_CUMANA, | |
38 | #endif | |
39 | #ifdef CONFIG_ACORN_PARTITION_ADFS | |
40 | adfspart_check_ADFS, | |
41 | #endif | |
42 | ||
43 | #ifdef CONFIG_CMDLINE_PARTITION | |
44 | cmdline_partition, | |
45 | #endif | |
46 | #ifdef CONFIG_EFI_PARTITION | |
47 | efi_partition, /* this must come before msdos */ | |
48 | #endif | |
49 | #ifdef CONFIG_SGI_PARTITION | |
50 | sgi_partition, | |
51 | #endif | |
52 | #ifdef CONFIG_LDM_PARTITION | |
53 | ldm_partition, /* this must come before msdos */ | |
54 | #endif | |
55 | #ifdef CONFIG_MSDOS_PARTITION | |
56 | msdos_partition, | |
57 | #endif | |
58 | #ifdef CONFIG_OSF_PARTITION | |
59 | osf_partition, | |
60 | #endif | |
61 | #ifdef CONFIG_SUN_PARTITION | |
62 | sun_partition, | |
63 | #endif | |
64 | #ifdef CONFIG_AMIGA_PARTITION | |
65 | amiga_partition, | |
66 | #endif | |
67 | #ifdef CONFIG_ATARI_PARTITION | |
68 | atari_partition, | |
69 | #endif | |
70 | #ifdef CONFIG_MAC_PARTITION | |
71 | mac_partition, | |
72 | #endif | |
73 | #ifdef CONFIG_ULTRIX_PARTITION | |
74 | ultrix_partition, | |
75 | #endif | |
76 | #ifdef CONFIG_IBM_PARTITION | |
77 | ibm_partition, | |
78 | #endif | |
79 | #ifdef CONFIG_KARMA_PARTITION | |
80 | karma_partition, | |
81 | #endif | |
82 | #ifdef CONFIG_SYSV68_PARTITION | |
83 | sysv68_partition, | |
84 | #endif | |
85 | NULL | |
86 | }; | |
87 | ||
88 | static struct parsed_partitions *allocate_partitions(struct gendisk *hd) | |
89 | { | |
90 | struct parsed_partitions *state; | |
91 | int nr; | |
92 | ||
93 | state = kzalloc(sizeof(*state), GFP_KERNEL); | |
94 | if (!state) | |
95 | return NULL; | |
96 | ||
97 | nr = disk_max_parts(hd); | |
98 | state->parts = vzalloc(array_size(nr, sizeof(state->parts[0]))); | |
99 | if (!state->parts) { | |
100 | kfree(state); | |
101 | return NULL; | |
102 | } | |
103 | ||
104 | state->limit = nr; | |
105 | ||
106 | return state; | |
107 | } | |
108 | ||
109 | static void free_partitions(struct parsed_partitions *state) | |
110 | { | |
111 | vfree(state->parts); | |
112 | kfree(state); | |
113 | } | |
114 | ||
115 | static struct parsed_partitions *check_partition(struct gendisk *hd, | |
116 | struct block_device *bdev) | |
117 | { | |
118 | struct parsed_partitions *state; | |
119 | int i, res, err; | |
120 | ||
121 | state = allocate_partitions(hd); | |
122 | if (!state) | |
123 | return NULL; | |
124 | state->pp_buf = (char *)__get_free_page(GFP_KERNEL); | |
125 | if (!state->pp_buf) { | |
126 | free_partitions(state); | |
127 | return NULL; | |
128 | } | |
129 | state->pp_buf[0] = '\0'; | |
130 | ||
131 | state->bdev = bdev; | |
132 | disk_name(hd, 0, state->name); | |
133 | snprintf(state->pp_buf, PAGE_SIZE, " %s:", state->name); | |
134 | if (isdigit(state->name[strlen(state->name)-1])) | |
135 | sprintf(state->name, "p"); | |
136 | ||
137 | i = res = err = 0; | |
138 | while (!res && check_part[i]) { | |
139 | memset(state->parts, 0, state->limit * sizeof(state->parts[0])); | |
140 | res = check_part[i++](state); | |
141 | if (res < 0) { | |
142 | /* | |
143 | * We have hit an I/O error which we don't report now. | |
144 | * But record it, and let the others do their job. | |
145 | */ | |
146 | err = res; | |
147 | res = 0; | |
148 | } | |
149 | ||
150 | } | |
151 | if (res > 0) { | |
152 | printk(KERN_INFO "%s", state->pp_buf); | |
153 | ||
154 | free_page((unsigned long)state->pp_buf); | |
155 | return state; | |
156 | } | |
157 | if (state->access_beyond_eod) | |
158 | err = -ENOSPC; | |
159 | /* | |
160 | * The partition is unrecognized. So report I/O errors if there were any | |
161 | */ | |
162 | if (err) | |
163 | res = err; | |
164 | if (res) { | |
165 | strlcat(state->pp_buf, | |
166 | " unable to read partition table\n", PAGE_SIZE); | |
167 | printk(KERN_INFO "%s", state->pp_buf); | |
168 | } | |
94ea4158 | 169 | |
387048bf CH |
170 | free_page((unsigned long)state->pp_buf); |
171 | free_partitions(state); | |
172 | return ERR_PTR(res); | |
173 | } | |
94ea4158 | 174 | |
94ea4158 AV |
175 | static ssize_t part_partition_show(struct device *dev, |
176 | struct device_attribute *attr, char *buf) | |
177 | { | |
178 | struct hd_struct *p = dev_to_part(dev); | |
179 | ||
180 | return sprintf(buf, "%d\n", p->partno); | |
181 | } | |
182 | ||
183 | static ssize_t part_start_show(struct device *dev, | |
184 | struct device_attribute *attr, char *buf) | |
185 | { | |
186 | struct hd_struct *p = dev_to_part(dev); | |
187 | ||
188 | return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect); | |
189 | } | |
190 | ||
94ea4158 AV |
191 | static ssize_t part_ro_show(struct device *dev, |
192 | struct device_attribute *attr, char *buf) | |
193 | { | |
194 | struct hd_struct *p = dev_to_part(dev); | |
195 | return sprintf(buf, "%d\n", p->policy ? 1 : 0); | |
196 | } | |
197 | ||
198 | static ssize_t part_alignment_offset_show(struct device *dev, | |
199 | struct device_attribute *attr, char *buf) | |
200 | { | |
201 | struct hd_struct *p = dev_to_part(dev); | |
202 | return sprintf(buf, "%llu\n", (unsigned long long)p->alignment_offset); | |
203 | } | |
204 | ||
205 | static ssize_t part_discard_alignment_show(struct device *dev, | |
206 | struct device_attribute *attr, char *buf) | |
207 | { | |
208 | struct hd_struct *p = dev_to_part(dev); | |
209 | return sprintf(buf, "%u\n", p->discard_alignment); | |
210 | } | |
211 | ||
5657a819 JP |
212 | static DEVICE_ATTR(partition, 0444, part_partition_show, NULL); |
213 | static DEVICE_ATTR(start, 0444, part_start_show, NULL); | |
214 | static DEVICE_ATTR(size, 0444, part_size_show, NULL); | |
215 | static DEVICE_ATTR(ro, 0444, part_ro_show, NULL); | |
216 | static DEVICE_ATTR(alignment_offset, 0444, part_alignment_offset_show, NULL); | |
217 | static DEVICE_ATTR(discard_alignment, 0444, part_discard_alignment_show, NULL); | |
218 | static DEVICE_ATTR(stat, 0444, part_stat_show, NULL); | |
219 | static DEVICE_ATTR(inflight, 0444, part_inflight_show, NULL); | |
94ea4158 AV |
220 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
221 | static struct device_attribute dev_attr_fail = | |
5657a819 | 222 | __ATTR(make-it-fail, 0644, part_fail_show, part_fail_store); |
94ea4158 AV |
223 | #endif |
224 | ||
225 | static struct attribute *part_attrs[] = { | |
226 | &dev_attr_partition.attr, | |
227 | &dev_attr_start.attr, | |
228 | &dev_attr_size.attr, | |
229 | &dev_attr_ro.attr, | |
230 | &dev_attr_alignment_offset.attr, | |
231 | &dev_attr_discard_alignment.attr, | |
232 | &dev_attr_stat.attr, | |
233 | &dev_attr_inflight.attr, | |
234 | #ifdef CONFIG_FAIL_MAKE_REQUEST | |
235 | &dev_attr_fail.attr, | |
236 | #endif | |
237 | NULL | |
238 | }; | |
239 | ||
240 | static struct attribute_group part_attr_group = { | |
241 | .attrs = part_attrs, | |
242 | }; | |
243 | ||
244 | static const struct attribute_group *part_attr_groups[] = { | |
245 | &part_attr_group, | |
246 | #ifdef CONFIG_BLK_DEV_IO_TRACE | |
247 | &blk_trace_attr_group, | |
248 | #endif | |
249 | NULL | |
250 | }; | |
251 | ||
252 | static void part_release(struct device *dev) | |
253 | { | |
254 | struct hd_struct *p = dev_to_part(dev); | |
2da78092 | 255 | blk_free_devt(dev->devt); |
b54e5ed8 | 256 | hd_free_part(p); |
94ea4158 AV |
257 | kfree(p); |
258 | } | |
259 | ||
0d9c51a6 SM |
260 | static int part_uevent(struct device *dev, struct kobj_uevent_env *env) |
261 | { | |
262 | struct hd_struct *part = dev_to_part(dev); | |
263 | ||
264 | add_uevent_var(env, "PARTN=%u", part->partno); | |
265 | if (part->info && part->info->volname[0]) | |
266 | add_uevent_var(env, "PARTNAME=%s", part->info->volname); | |
267 | return 0; | |
268 | } | |
269 | ||
94ea4158 AV |
270 | struct device_type part_type = { |
271 | .name = "partition", | |
272 | .groups = part_attr_groups, | |
273 | .release = part_release, | |
0d9c51a6 | 274 | .uevent = part_uevent, |
94ea4158 AV |
275 | }; |
276 | ||
94a2c3a3 | 277 | static void delete_partition_work_fn(struct work_struct *work) |
94ea4158 | 278 | { |
94a2c3a3 YY |
279 | struct hd_struct *part = container_of(to_rcu_work(work), struct hd_struct, |
280 | rcu_work); | |
94ea4158 AV |
281 | |
282 | part->start_sect = 0; | |
283 | part->nr_sects = 0; | |
284 | part_stat_set_all(part, 0); | |
285 | put_device(part_to_dev(part)); | |
286 | } | |
287 | ||
6c71013e | 288 | void __delete_partition(struct percpu_ref *ref) |
94ea4158 | 289 | { |
6c71013e | 290 | struct hd_struct *part = container_of(ref, struct hd_struct, ref); |
94a2c3a3 YY |
291 | INIT_RCU_WORK(&part->rcu_work, delete_partition_work_fn); |
292 | queue_rcu_work(system_wq, &part->rcu_work); | |
94ea4158 AV |
293 | } |
294 | ||
6d2cf6f2 BVA |
295 | /* |
296 | * Must be called either with bd_mutex held, before a disk can be opened or | |
297 | * after all disk users are gone. | |
298 | */ | |
94ea4158 AV |
299 | void delete_partition(struct gendisk *disk, int partno) |
300 | { | |
6d2cf6f2 BVA |
301 | struct disk_part_tbl *ptbl = |
302 | rcu_dereference_protected(disk->part_tbl, 1); | |
94ea4158 AV |
303 | struct hd_struct *part; |
304 | ||
305 | if (partno >= ptbl->len) | |
306 | return; | |
307 | ||
6d2cf6f2 | 308 | part = rcu_dereference_protected(ptbl->part[partno], 1); |
94ea4158 AV |
309 | if (!part) |
310 | return; | |
311 | ||
94ea4158 AV |
312 | rcu_assign_pointer(ptbl->part[partno], NULL); |
313 | rcu_assign_pointer(ptbl->last_lookup, NULL); | |
314 | kobject_put(part->holder_dir); | |
315 | device_del(part_to_dev(part)); | |
316 | ||
6fcc44d1 YY |
317 | /* |
318 | * Remove gendisk pointer from idr so that it cannot be looked up | |
319 | * while RCU period before freeing gendisk is running to prevent | |
320 | * use-after-free issues. Note that the device number stays | |
321 | * "in-use" until we really free the gendisk. | |
322 | */ | |
323 | blk_invalidate_devt(part_devt(part)); | |
6c71013e | 324 | hd_struct_kill(part); |
94ea4158 AV |
325 | } |
326 | ||
327 | static ssize_t whole_disk_show(struct device *dev, | |
328 | struct device_attribute *attr, char *buf) | |
329 | { | |
330 | return 0; | |
331 | } | |
5657a819 | 332 | static DEVICE_ATTR(whole_disk, 0444, whole_disk_show, NULL); |
94ea4158 | 333 | |
6d2cf6f2 BVA |
334 | /* |
335 | * Must be called either with bd_mutex held, before a disk can be opened or | |
336 | * after all disk users are gone. | |
337 | */ | |
94ea4158 AV |
338 | struct hd_struct *add_partition(struct gendisk *disk, int partno, |
339 | sector_t start, sector_t len, int flags, | |
340 | struct partition_meta_info *info) | |
341 | { | |
342 | struct hd_struct *p; | |
343 | dev_t devt = MKDEV(0, 0); | |
344 | struct device *ddev = disk_to_dev(disk); | |
345 | struct device *pdev; | |
346 | struct disk_part_tbl *ptbl; | |
347 | const char *dname; | |
348 | int err; | |
349 | ||
b7205307 CH |
350 | /* |
351 | * Partitions are not supported on zoned block devices that are used as | |
352 | * such. | |
353 | */ | |
354 | switch (disk->queue->limits.zoned) { | |
355 | case BLK_ZONED_HM: | |
356 | pr_warn("%s: partitions not supported on host managed zoned block device\n", | |
357 | disk->disk_name); | |
358 | return ERR_PTR(-ENXIO); | |
359 | case BLK_ZONED_HA: | |
360 | pr_info("%s: disabling host aware zoned block device support due to partitions\n", | |
361 | disk->disk_name); | |
362 | disk->queue->limits.zoned = BLK_ZONED_NONE; | |
363 | break; | |
364 | case BLK_ZONED_NONE: | |
365 | break; | |
366 | } | |
367 | ||
94ea4158 AV |
368 | err = disk_expand_part_tbl(disk, partno); |
369 | if (err) | |
370 | return ERR_PTR(err); | |
6d2cf6f2 | 371 | ptbl = rcu_dereference_protected(disk->part_tbl, 1); |
94ea4158 AV |
372 | |
373 | if (ptbl->part[partno]) | |
374 | return ERR_PTR(-EBUSY); | |
375 | ||
376 | p = kzalloc(sizeof(*p), GFP_KERNEL); | |
377 | if (!p) | |
378 | return ERR_PTR(-EBUSY); | |
379 | ||
380 | if (!init_part_stats(p)) { | |
381 | err = -ENOMEM; | |
382 | goto out_free; | |
383 | } | |
c83f6bf9 VG |
384 | |
385 | seqcount_init(&p->nr_sects_seq); | |
94ea4158 AV |
386 | pdev = part_to_dev(p); |
387 | ||
388 | p->start_sect = start; | |
389 | p->alignment_offset = | |
390 | queue_limit_alignment_offset(&disk->queue->limits, start); | |
391 | p->discard_alignment = | |
392 | queue_limit_discard_alignment(&disk->queue->limits, start); | |
393 | p->nr_sects = len; | |
394 | p->partno = partno; | |
395 | p->policy = get_disk_ro(disk); | |
396 | ||
397 | if (info) { | |
f17c21c1 CH |
398 | struct partition_meta_info *pinfo; |
399 | ||
400 | pinfo = kzalloc_node(sizeof(*pinfo), GFP_KERNEL, disk->node_id); | |
7bd897cf DC |
401 | if (!pinfo) { |
402 | err = -ENOMEM; | |
94ea4158 | 403 | goto out_free_stats; |
7bd897cf | 404 | } |
94ea4158 AV |
405 | memcpy(pinfo, info, sizeof(*info)); |
406 | p->info = pinfo; | |
407 | } | |
408 | ||
409 | dname = dev_name(ddev); | |
410 | if (isdigit(dname[strlen(dname) - 1])) | |
411 | dev_set_name(pdev, "%sp%d", dname, partno); | |
412 | else | |
413 | dev_set_name(pdev, "%s%d", dname, partno); | |
414 | ||
415 | device_initialize(pdev); | |
416 | pdev->class = &block_class; | |
417 | pdev->type = &part_type; | |
418 | pdev->parent = ddev; | |
419 | ||
420 | err = blk_alloc_devt(p, &devt); | |
421 | if (err) | |
422 | goto out_free_info; | |
423 | pdev->devt = devt; | |
424 | ||
425 | /* delay uevent until 'holders' subdir is created */ | |
426 | dev_set_uevent_suppress(pdev, 1); | |
427 | err = device_add(pdev); | |
428 | if (err) | |
429 | goto out_put; | |
430 | ||
431 | err = -ENOMEM; | |
432 | p->holder_dir = kobject_create_and_add("holders", &pdev->kobj); | |
433 | if (!p->holder_dir) | |
434 | goto out_del; | |
435 | ||
436 | dev_set_uevent_suppress(pdev, 0); | |
437 | if (flags & ADDPART_FLAG_WHOLEDISK) { | |
438 | err = device_create_file(pdev, &dev_attr_whole_disk); | |
439 | if (err) | |
440 | goto out_del; | |
441 | } | |
442 | ||
b30a337c ML |
443 | err = hd_ref_init(p); |
444 | if (err) { | |
445 | if (flags & ADDPART_FLAG_WHOLEDISK) | |
446 | goto out_remove_file; | |
447 | goto out_del; | |
448 | } | |
449 | ||
94ea4158 AV |
450 | /* everything is up and running, commence */ |
451 | rcu_assign_pointer(ptbl->part[partno], p); | |
452 | ||
453 | /* suppress uevent if the disk suppresses it */ | |
454 | if (!dev_get_uevent_suppress(ddev)) | |
455 | kobject_uevent(&pdev->kobj, KOBJ_ADD); | |
b30a337c | 456 | return p; |
94ea4158 AV |
457 | |
458 | out_free_info: | |
f17c21c1 | 459 | kfree(p->info); |
94ea4158 AV |
460 | out_free_stats: |
461 | free_part_stats(p); | |
462 | out_free: | |
463 | kfree(p); | |
464 | return ERR_PTR(err); | |
b30a337c ML |
465 | out_remove_file: |
466 | device_remove_file(pdev, &dev_attr_whole_disk); | |
94ea4158 AV |
467 | out_del: |
468 | kobject_put(p->holder_dir); | |
469 | device_del(pdev); | |
470 | out_put: | |
471 | put_device(pdev); | |
94ea4158 AV |
472 | return ERR_PTR(err); |
473 | } | |
474 | ||
475 | static bool disk_unlock_native_capacity(struct gendisk *disk) | |
476 | { | |
477 | const struct block_device_operations *bdops = disk->fops; | |
478 | ||
479 | if (bdops->unlock_native_capacity && | |
480 | !(disk->flags & GENHD_FL_NATIVE_CAPACITY)) { | |
481 | printk(KERN_CONT "enabling native capacity\n"); | |
482 | bdops->unlock_native_capacity(disk); | |
483 | disk->flags |= GENHD_FL_NATIVE_CAPACITY; | |
484 | return true; | |
485 | } else { | |
486 | printk(KERN_CONT "truncated\n"); | |
487 | return false; | |
488 | } | |
489 | } | |
490 | ||
a1548b67 | 491 | int blk_drop_partitions(struct gendisk *disk, struct block_device *bdev) |
94ea4158 | 492 | { |
94ea4158 AV |
493 | struct disk_part_iter piter; |
494 | struct hd_struct *part; | |
fe316bf2 | 495 | int res; |
94ea4158 | 496 | |
142fe8f4 CH |
497 | if (!disk_part_scan_enabled(disk)) |
498 | return 0; | |
cb6b771b | 499 | if (bdev->bd_part_count || bdev->bd_openers > 1) |
94ea4158 AV |
500 | return -EBUSY; |
501 | res = invalidate_partition(disk, 0); | |
502 | if (res) | |
503 | return res; | |
504 | ||
505 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); | |
506 | while ((part = disk_part_iter_next(&piter))) | |
507 | delete_partition(disk, part->partno); | |
508 | disk_part_iter_exit(&piter); | |
509 | ||
fe316bf2 JN |
510 | return 0; |
511 | } | |
512 | ||
f902b026 CH |
513 | static bool blk_add_partition(struct gendisk *disk, struct block_device *bdev, |
514 | struct parsed_partitions *state, int p) | |
fe316bf2 | 515 | { |
f902b026 CH |
516 | sector_t size = state->parts[p].size; |
517 | sector_t from = state->parts[p].from; | |
fe316bf2 | 518 | struct hd_struct *part; |
f902b026 CH |
519 | |
520 | if (!size) | |
521 | return true; | |
522 | ||
523 | if (from >= get_capacity(disk)) { | |
524 | printk(KERN_WARNING | |
525 | "%s: p%d start %llu is beyond EOD, ", | |
526 | disk->disk_name, p, (unsigned long long) from); | |
527 | if (disk_unlock_native_capacity(disk)) | |
528 | return false; | |
529 | return true; | |
fe316bf2 JN |
530 | } |
531 | ||
f902b026 CH |
532 | if (from + size > get_capacity(disk)) { |
533 | printk(KERN_WARNING | |
534 | "%s: p%d size %llu extends beyond EOD, ", | |
535 | disk->disk_name, p, (unsigned long long) size); | |
fe316bf2 | 536 | |
f902b026 CH |
537 | if (disk_unlock_native_capacity(disk)) |
538 | return false; | |
539 | ||
540 | /* | |
541 | * We can not ignore partitions of broken tables created by for | |
542 | * example camera firmware, but we limit them to the end of the | |
543 | * disk to avoid creating invalid block devices. | |
544 | */ | |
545 | size = get_capacity(disk) - from; | |
546 | } | |
547 | ||
548 | part = add_partition(disk, p, from, size, state->parts[p].flags, | |
549 | &state->parts[p].info); | |
b7205307 | 550 | if (IS_ERR(part) && PTR_ERR(part) != -ENXIO) { |
f902b026 CH |
551 | printk(KERN_ERR " %s: p%d could not be added: %ld\n", |
552 | disk->disk_name, p, -PTR_ERR(part)); | |
553 | return true; | |
554 | } | |
555 | ||
74cc979c CH |
556 | if (IS_BUILTIN(CONFIG_BLK_DEV_MD) && |
557 | (state->parts[p].flags & ADDPART_FLAG_RAID)) | |
f902b026 | 558 | md_autodetect_dev(part_to_dev(part)->devt); |
74cc979c | 559 | |
f902b026 CH |
560 | return true; |
561 | } | |
562 | ||
a1548b67 | 563 | int blk_add_partitions(struct gendisk *disk, struct block_device *bdev) |
f902b026 CH |
564 | { |
565 | struct parsed_partitions *state; | |
566 | int ret = -EAGAIN, p, highest; | |
fe316bf2 | 567 | |
142fe8f4 CH |
568 | if (!disk_part_scan_enabled(disk)) |
569 | return 0; | |
570 | ||
f902b026 CH |
571 | state = check_partition(disk, bdev); |
572 | if (!state) | |
94ea4158 AV |
573 | return 0; |
574 | if (IS_ERR(state)) { | |
575 | /* | |
f902b026 CH |
576 | * I/O error reading the partition table. If we tried to read |
577 | * beyond EOD, retry after unlocking the native capacity. | |
94ea4158 AV |
578 | */ |
579 | if (PTR_ERR(state) == -ENOSPC) { | |
580 | printk(KERN_WARNING "%s: partition table beyond EOD, ", | |
581 | disk->disk_name); | |
582 | if (disk_unlock_native_capacity(disk)) | |
f902b026 | 583 | return -EAGAIN; |
94ea4158 AV |
584 | } |
585 | return -EIO; | |
586 | } | |
5eac3eb3 | 587 | |
f902b026 | 588 | /* |
b7205307 | 589 | * Partitions are not supported on host managed zoned block devices. |
f902b026 | 590 | */ |
b7205307 CH |
591 | if (disk->queue->limits.zoned == BLK_ZONED_HM) { |
592 | pr_warn("%s: ignoring partition table on host managed zoned block device\n", | |
5eac3eb3 | 593 | disk->disk_name); |
f902b026 CH |
594 | ret = 0; |
595 | goto out_free_state; | |
5eac3eb3 DLM |
596 | } |
597 | ||
94ea4158 | 598 | /* |
f902b026 CH |
599 | * If we read beyond EOD, try unlocking native capacity even if the |
600 | * partition table was successfully read as we could be missing some | |
601 | * partitions. | |
94ea4158 AV |
602 | */ |
603 | if (state->access_beyond_eod) { | |
604 | printk(KERN_WARNING | |
605 | "%s: partition table partially beyond EOD, ", | |
606 | disk->disk_name); | |
607 | if (disk_unlock_native_capacity(disk)) | |
f902b026 | 608 | goto out_free_state; |
94ea4158 AV |
609 | } |
610 | ||
611 | /* tell userspace that the media / partition table may have changed */ | |
612 | kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); | |
613 | ||
f902b026 CH |
614 | /* |
615 | * Detect the highest partition number and preallocate disk->part_tbl. | |
616 | * This is an optimization and not strictly necessary. | |
94ea4158 AV |
617 | */ |
618 | for (p = 1, highest = 0; p < state->limit; p++) | |
619 | if (state->parts[p].size) | |
620 | highest = p; | |
94ea4158 AV |
621 | disk_expand_part_tbl(disk, highest); |
622 | ||
f902b026 CH |
623 | for (p = 1; p < state->limit; p++) |
624 | if (!blk_add_partition(disk, bdev, state, p)) | |
625 | goto out_free_state; | |
94ea4158 | 626 | |
f902b026 CH |
627 | ret = 0; |
628 | out_free_state: | |
ac2e5327 | 629 | free_partitions(state); |
f902b026 | 630 | return ret; |
fe316bf2 JN |
631 | } |
632 | ||
1a9fba3a | 633 | void *read_part_sector(struct parsed_partitions *state, sector_t n, Sector *p) |
d1a5f2b4 | 634 | { |
1a9fba3a | 635 | struct address_space *mapping = state->bdev->bd_inode->i_mapping; |
94ea4158 AV |
636 | struct page *page; |
637 | ||
1a9fba3a CH |
638 | if (n >= get_capacity(state->bdev->bd_disk)) { |
639 | state->access_beyond_eod = true; | |
640 | return NULL; | |
94ea4158 | 641 | } |
1a9fba3a CH |
642 | |
643 | page = read_mapping_page(mapping, | |
644 | (pgoff_t)(n >> (PAGE_SHIFT - 9)), NULL); | |
645 | if (IS_ERR(page)) | |
646 | goto out; | |
647 | if (PageError(page)) | |
648 | goto out_put_page; | |
649 | ||
650 | p->v = page; | |
651 | return (unsigned char *)page_address(page) + | |
652 | ((n & ((1 << (PAGE_SHIFT - 9)) - 1)) << SECTOR_SHIFT); | |
653 | out_put_page: | |
654 | put_page(page); | |
655 | out: | |
94ea4158 AV |
656 | p->v = NULL; |
657 | return NULL; | |
658 | } |