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 | 7 | #include <linux/fs.h> |
b81e0c23 | 8 | #include <linux/major.h> |
94ea4158 | 9 | #include <linux/slab.h> |
94ea4158 | 10 | #include <linux/ctype.h> |
387048bf | 11 | #include <linux/vmalloc.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 | ||
a782483c CH |
88 | static void bdev_set_nr_sectors(struct block_device *bdev, sector_t sectors) |
89 | { | |
0f472277 | 90 | spin_lock(&bdev->bd_size_lock); |
a782483c | 91 | i_size_write(bdev->bd_inode, (loff_t)sectors << SECTOR_SHIFT); |
f09313c5 | 92 | bdev->bd_nr_sectors = sectors; |
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; | |
1ebe2e5f | 99 | int nr = DISK_MAX_PARTS; |
387048bf CH |
100 | |
101 | state = kzalloc(sizeof(*state), GFP_KERNEL); | |
102 | if (!state) | |
103 | return NULL; | |
104 | ||
387048bf CH |
105 | state->parts = vzalloc(array_size(nr, sizeof(state->parts[0]))); |
106 | if (!state->parts) { | |
107 | kfree(state); | |
108 | return NULL; | |
109 | } | |
110 | ||
111 | state->limit = nr; | |
112 | ||
113 | return state; | |
114 | } | |
115 | ||
116 | static void free_partitions(struct parsed_partitions *state) | |
117 | { | |
118 | vfree(state->parts); | |
119 | kfree(state); | |
120 | } | |
121 | ||
0384264e | 122 | static struct parsed_partitions *check_partition(struct gendisk *hd) |
387048bf CH |
123 | { |
124 | struct parsed_partitions *state; | |
125 | int i, res, err; | |
126 | ||
127 | state = allocate_partitions(hd); | |
128 | if (!state) | |
129 | return NULL; | |
130 | state->pp_buf = (char *)__get_free_page(GFP_KERNEL); | |
131 | if (!state->pp_buf) { | |
132 | free_partitions(state); | |
133 | return NULL; | |
134 | } | |
135 | state->pp_buf[0] = '\0'; | |
136 | ||
a08aa9bc | 137 | state->disk = hd; |
1d703547 | 138 | snprintf(state->name, BDEVNAME_SIZE, "%s", hd->disk_name); |
387048bf CH |
139 | snprintf(state->pp_buf, PAGE_SIZE, " %s:", state->name); |
140 | if (isdigit(state->name[strlen(state->name)-1])) | |
141 | sprintf(state->name, "p"); | |
142 | ||
143 | i = res = err = 0; | |
144 | while (!res && check_part[i]) { | |
145 | memset(state->parts, 0, state->limit * sizeof(state->parts[0])); | |
146 | res = check_part[i++](state); | |
147 | if (res < 0) { | |
148 | /* | |
149 | * We have hit an I/O error which we don't report now. | |
150 | * But record it, and let the others do their job. | |
151 | */ | |
152 | err = res; | |
153 | res = 0; | |
154 | } | |
155 | ||
156 | } | |
157 | if (res > 0) { | |
158 | printk(KERN_INFO "%s", state->pp_buf); | |
159 | ||
160 | free_page((unsigned long)state->pp_buf); | |
161 | return state; | |
162 | } | |
163 | if (state->access_beyond_eod) | |
164 | err = -ENOSPC; | |
165 | /* | |
166 | * The partition is unrecognized. So report I/O errors if there were any | |
167 | */ | |
168 | if (err) | |
169 | res = err; | |
170 | if (res) { | |
171 | strlcat(state->pp_buf, | |
172 | " unable to read partition table\n", PAGE_SIZE); | |
173 | printk(KERN_INFO "%s", state->pp_buf); | |
174 | } | |
94ea4158 | 175 | |
387048bf CH |
176 | free_page((unsigned long)state->pp_buf); |
177 | free_partitions(state); | |
178 | return ERR_PTR(res); | |
179 | } | |
94ea4158 | 180 | |
94ea4158 AV |
181 | static ssize_t part_partition_show(struct device *dev, |
182 | struct device_attribute *attr, char *buf) | |
183 | { | |
0d02129e | 184 | return sprintf(buf, "%d\n", dev_to_bdev(dev)->bd_partno); |
94ea4158 AV |
185 | } |
186 | ||
187 | static ssize_t part_start_show(struct device *dev, | |
188 | struct device_attribute *attr, char *buf) | |
189 | { | |
0d02129e | 190 | return sprintf(buf, "%llu\n", dev_to_bdev(dev)->bd_start_sect); |
94ea4158 AV |
191 | } |
192 | ||
94ea4158 AV |
193 | static ssize_t part_ro_show(struct device *dev, |
194 | struct device_attribute *attr, char *buf) | |
195 | { | |
52f019d4 | 196 | return sprintf(buf, "%d\n", bdev_read_only(dev_to_bdev(dev))); |
94ea4158 AV |
197 | } |
198 | ||
199 | static ssize_t part_alignment_offset_show(struct device *dev, | |
200 | struct device_attribute *attr, char *buf) | |
201 | { | |
64dcc7c2 | 202 | return sprintf(buf, "%u\n", bdev_alignment_offset(dev_to_bdev(dev))); |
94ea4158 AV |
203 | } |
204 | ||
205 | static ssize_t part_discard_alignment_show(struct device *dev, | |
206 | struct device_attribute *attr, char *buf) | |
207 | { | |
f0f975a4 | 208 | return sprintf(buf, "%u\n", bdev_discard_alignment(dev_to_bdev(dev))); |
94ea4158 AV |
209 | } |
210 | ||
5657a819 JP |
211 | static DEVICE_ATTR(partition, 0444, part_partition_show, NULL); |
212 | static DEVICE_ATTR(start, 0444, part_start_show, NULL); | |
213 | static DEVICE_ATTR(size, 0444, part_size_show, NULL); | |
214 | static DEVICE_ATTR(ro, 0444, part_ro_show, NULL); | |
215 | static DEVICE_ATTR(alignment_offset, 0444, part_alignment_offset_show, NULL); | |
216 | static DEVICE_ATTR(discard_alignment, 0444, part_discard_alignment_show, NULL); | |
217 | static DEVICE_ATTR(stat, 0444, part_stat_show, NULL); | |
218 | static DEVICE_ATTR(inflight, 0444, part_inflight_show, NULL); | |
94ea4158 AV |
219 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
220 | static struct device_attribute dev_attr_fail = | |
5657a819 | 221 | __ATTR(make-it-fail, 0644, part_fail_show, part_fail_store); |
94ea4158 AV |
222 | #endif |
223 | ||
224 | static struct attribute *part_attrs[] = { | |
225 | &dev_attr_partition.attr, | |
226 | &dev_attr_start.attr, | |
227 | &dev_attr_size.attr, | |
228 | &dev_attr_ro.attr, | |
229 | &dev_attr_alignment_offset.attr, | |
230 | &dev_attr_discard_alignment.attr, | |
231 | &dev_attr_stat.attr, | |
232 | &dev_attr_inflight.attr, | |
233 | #ifdef CONFIG_FAIL_MAKE_REQUEST | |
234 | &dev_attr_fail.attr, | |
235 | #endif | |
236 | NULL | |
237 | }; | |
238 | ||
239 | static struct attribute_group part_attr_group = { | |
240 | .attrs = part_attrs, | |
241 | }; | |
242 | ||
243 | static const struct attribute_group *part_attr_groups[] = { | |
244 | &part_attr_group, | |
245 | #ifdef CONFIG_BLK_DEV_IO_TRACE | |
246 | &blk_trace_attr_group, | |
247 | #endif | |
248 | NULL | |
249 | }; | |
250 | ||
251 | static void part_release(struct device *dev) | |
252 | { | |
9d3b8813 | 253 | put_disk(dev_to_bdev(dev)->bd_disk); |
2f4731dc | 254 | iput(dev_to_bdev(dev)->bd_inode); |
94ea4158 AV |
255 | } |
256 | ||
162736b0 | 257 | static int part_uevent(const struct device *dev, struct kobj_uevent_env *env) |
0d9c51a6 | 258 | { |
162736b0 | 259 | const struct block_device *part = dev_to_bdev(dev); |
0d9c51a6 | 260 | |
0d02129e CH |
261 | add_uevent_var(env, "PARTN=%u", part->bd_partno); |
262 | if (part->bd_meta_info && part->bd_meta_info->volname[0]) | |
263 | add_uevent_var(env, "PARTNAME=%s", part->bd_meta_info->volname); | |
0d9c51a6 SM |
264 | return 0; |
265 | } | |
266 | ||
94ea4158 AV |
267 | struct device_type part_type = { |
268 | .name = "partition", | |
269 | .groups = part_attr_groups, | |
270 | .release = part_release, | |
0d9c51a6 | 271 | .uevent = part_uevent, |
94ea4158 AV |
272 | }; |
273 | ||
d3c4a43d | 274 | static void delete_partition(struct block_device *part) |
94ea4158 | 275 | { |
a45e43ca CH |
276 | lockdep_assert_held(&part->bd_disk->open_mutex); |
277 | ||
473338be CH |
278 | fsync_bdev(part); |
279 | __invalidate_device(part, true); | |
280 | ||
a33df75c | 281 | xa_erase(&part->bd_disk->part_tbl, part->bd_partno); |
0d02129e CH |
282 | kobject_put(part->bd_holder_dir); |
283 | device_del(&part->bd_device); | |
94ea4158 | 284 | |
6fcc44d1 | 285 | /* |
22ae8ce8 CH |
286 | * Remove the block device from the inode hash, so that it cannot be |
287 | * looked up any more even when openers still hold references. | |
6fcc44d1 | 288 | */ |
0d02129e | 289 | remove_inode_hash(part->bd_inode); |
22ae8ce8 | 290 | |
0d02129e | 291 | put_device(&part->bd_device); |
94ea4158 AV |
292 | } |
293 | ||
294 | static ssize_t whole_disk_show(struct device *dev, | |
295 | struct device_attribute *attr, char *buf) | |
296 | { | |
297 | return 0; | |
298 | } | |
5657a819 | 299 | static DEVICE_ATTR(whole_disk, 0444, whole_disk_show, NULL); |
94ea4158 | 300 | |
6d2cf6f2 | 301 | /* |
a8698707 | 302 | * Must be called either with open_mutex held, before a disk can be opened or |
6d2cf6f2 BVA |
303 | * after all disk users are gone. |
304 | */ | |
0d02129e | 305 | static struct block_device *add_partition(struct gendisk *disk, int partno, |
94ea4158 AV |
306 | sector_t start, sector_t len, int flags, |
307 | struct partition_meta_info *info) | |
308 | { | |
94ea4158 AV |
309 | dev_t devt = MKDEV(0, 0); |
310 | struct device *ddev = disk_to_dev(disk); | |
311 | struct device *pdev; | |
22ae8ce8 | 312 | struct block_device *bdev; |
94ea4158 AV |
313 | const char *dname; |
314 | int err; | |
315 | ||
0e0ccdec CH |
316 | lockdep_assert_held(&disk->open_mutex); |
317 | ||
1ebe2e5f | 318 | if (partno >= DISK_MAX_PARTS) |
e82fc785 ML |
319 | return ERR_PTR(-EINVAL); |
320 | ||
b7205307 CH |
321 | /* |
322 | * Partitions are not supported on zoned block devices that are used as | |
323 | * such. | |
324 | */ | |
325 | switch (disk->queue->limits.zoned) { | |
326 | case BLK_ZONED_HM: | |
327 | pr_warn("%s: partitions not supported on host managed zoned block device\n", | |
328 | disk->disk_name); | |
329 | return ERR_PTR(-ENXIO); | |
330 | case BLK_ZONED_HA: | |
331 | pr_info("%s: disabling host aware zoned block device support due to partitions\n", | |
332 | disk->disk_name); | |
6b2bd274 | 333 | disk_set_zoned(disk, BLK_ZONED_NONE); |
b7205307 CH |
334 | break; |
335 | case BLK_ZONED_NONE: | |
336 | break; | |
337 | } | |
338 | ||
a33df75c | 339 | if (xa_load(&disk->part_tbl, partno)) |
94ea4158 AV |
340 | return ERR_PTR(-EBUSY); |
341 | ||
9d3b8813 CH |
342 | /* ensure we always have a reference to the whole disk */ |
343 | get_device(disk_to_dev(disk)); | |
344 | ||
345 | err = -ENOMEM; | |
22ae8ce8 CH |
346 | bdev = bdev_alloc(disk, partno); |
347 | if (!bdev) | |
9d3b8813 | 348 | goto out_put_disk; |
c83f6bf9 | 349 | |
29ff57c6 | 350 | bdev->bd_start_sect = start; |
a782483c | 351 | bdev_set_nr_sectors(bdev, len); |
94ea4158 | 352 | |
0d02129e | 353 | pdev = &bdev->bd_device; |
94ea4158 AV |
354 | dname = dev_name(ddev); |
355 | if (isdigit(dname[strlen(dname) - 1])) | |
356 | dev_set_name(pdev, "%sp%d", dname, partno); | |
357 | else | |
358 | dev_set_name(pdev, "%s%d", dname, partno); | |
359 | ||
360 | device_initialize(pdev); | |
361 | pdev->class = &block_class; | |
362 | pdev->type = &part_type; | |
363 | pdev->parent = ddev; | |
364 | ||
7c3f828b CH |
365 | /* in consecutive minor range? */ |
366 | if (bdev->bd_partno < disk->minors) { | |
367 | devt = MKDEV(disk->major, disk->first_minor + bdev->bd_partno); | |
368 | } else { | |
369 | err = blk_alloc_ext_minor(); | |
370 | if (err < 0) | |
371 | goto out_put; | |
372 | devt = MKDEV(BLOCK_EXT_MAJOR, err); | |
373 | } | |
94ea4158 AV |
374 | pdev->devt = devt; |
375 | ||
0468c532 CH |
376 | if (info) { |
377 | err = -ENOMEM; | |
378 | bdev->bd_meta_info = kmemdup(info, sizeof(*info), GFP_KERNEL); | |
379 | if (!bdev->bd_meta_info) | |
380 | goto out_put; | |
381 | } | |
382 | ||
94ea4158 AV |
383 | /* delay uevent until 'holders' subdir is created */ |
384 | dev_set_uevent_suppress(pdev, 1); | |
385 | err = device_add(pdev); | |
386 | if (err) | |
387 | goto out_put; | |
388 | ||
389 | err = -ENOMEM; | |
1bdd5ae0 CH |
390 | bdev->bd_holder_dir = kobject_create_and_add("holders", &pdev->kobj); |
391 | if (!bdev->bd_holder_dir) | |
94ea4158 AV |
392 | goto out_del; |
393 | ||
394 | dev_set_uevent_suppress(pdev, 0); | |
395 | if (flags & ADDPART_FLAG_WHOLEDISK) { | |
396 | err = device_create_file(pdev, &dev_attr_whole_disk); | |
397 | if (err) | |
398 | goto out_del; | |
399 | } | |
400 | ||
401 | /* everything is up and running, commence */ | |
a33df75c CH |
402 | err = xa_insert(&disk->part_tbl, partno, bdev, GFP_KERNEL); |
403 | if (err) | |
404 | goto out_del; | |
22ae8ce8 | 405 | bdev_add(bdev, devt); |
94ea4158 AV |
406 | |
407 | /* suppress uevent if the disk suppresses it */ | |
408 | if (!dev_get_uevent_suppress(ddev)) | |
409 | kobject_uevent(&pdev->kobj, KOBJ_ADD); | |
0d02129e | 410 | return bdev; |
94ea4158 | 411 | |
94ea4158 | 412 | out_del: |
1bdd5ae0 | 413 | kobject_put(bdev->bd_holder_dir); |
94ea4158 AV |
414 | device_del(pdev); |
415 | out_put: | |
416 | put_device(pdev); | |
9fbfabfd | 417 | return ERR_PTR(err); |
9d3b8813 CH |
418 | out_put_disk: |
419 | put_disk(disk); | |
94ea4158 AV |
420 | return ERR_PTR(err); |
421 | } | |
422 | ||
fa9156ae CH |
423 | static bool partition_overlaps(struct gendisk *disk, sector_t start, |
424 | sector_t length, int skip_partno) | |
425 | { | |
ad1eaa53 | 426 | struct block_device *part; |
fa9156ae | 427 | bool overlap = false; |
e3069123 CH |
428 | unsigned long idx; |
429 | ||
430 | rcu_read_lock(); | |
431 | xa_for_each_start(&disk->part_tbl, idx, part, 1) { | |
432 | if (part->bd_partno != skip_partno && | |
433 | start < part->bd_start_sect + bdev_nr_sectors(part) && | |
434 | start + length > part->bd_start_sect) { | |
435 | overlap = true; | |
436 | break; | |
437 | } | |
fa9156ae | 438 | } |
e3069123 | 439 | rcu_read_unlock(); |
fa9156ae | 440 | |
fa9156ae CH |
441 | return overlap; |
442 | } | |
443 | ||
7f6be376 CH |
444 | int bdev_add_partition(struct gendisk *disk, int partno, sector_t start, |
445 | sector_t length) | |
fa9156ae | 446 | { |
0d02129e | 447 | struct block_device *part; |
b5cfbd35 | 448 | int ret; |
fa9156ae | 449 | |
b5cfbd35 | 450 | mutex_lock(&disk->open_mutex); |
50b4aecf | 451 | if (!disk_live(disk)) { |
b5cfbd35 YY |
452 | ret = -ENXIO; |
453 | goto out; | |
454 | } | |
455 | ||
456 | if (partition_overlaps(disk, start, length, -1)) { | |
457 | ret = -EBUSY; | |
458 | goto out; | |
fa9156ae CH |
459 | } |
460 | ||
b5cfbd35 | 461 | part = add_partition(disk, partno, start, length, |
fa9156ae | 462 | ADDPART_FLAG_NONE, NULL); |
b5cfbd35 YY |
463 | ret = PTR_ERR_OR_ZERO(part); |
464 | out: | |
465 | mutex_unlock(&disk->open_mutex); | |
466 | return ret; | |
fa9156ae CH |
467 | } |
468 | ||
926fbb16 | 469 | int bdev_del_partition(struct gendisk *disk, int partno) |
fa9156ae | 470 | { |
0e0ccdec CH |
471 | struct block_device *part = NULL; |
472 | int ret = -ENXIO; | |
fa9156ae | 473 | |
926fbb16 CH |
474 | mutex_lock(&disk->open_mutex); |
475 | part = xa_load(&disk->part_tbl, partno); | |
0e0ccdec CH |
476 | if (!part) |
477 | goto out_unlock; | |
08fc1ab6 | 478 | |
fa9156ae | 479 | ret = -EBUSY; |
9acf381f | 480 | if (atomic_read(&part->bd_openers)) |
fa9156ae CH |
481 | goto out_unlock; |
482 | ||
8328eb28 | 483 | delete_partition(part); |
fa9156ae CH |
484 | ret = 0; |
485 | out_unlock: | |
926fbb16 | 486 | mutex_unlock(&disk->open_mutex); |
fa9156ae CH |
487 | return ret; |
488 | } | |
489 | ||
3d2e7989 CH |
490 | int bdev_resize_partition(struct gendisk *disk, int partno, sector_t start, |
491 | sector_t length) | |
fa9156ae | 492 | { |
0e0ccdec CH |
493 | struct block_device *part = NULL; |
494 | int ret = -ENXIO; | |
fa9156ae | 495 | |
3d2e7989 CH |
496 | mutex_lock(&disk->open_mutex); |
497 | part = xa_load(&disk->part_tbl, partno); | |
fa9156ae | 498 | if (!part) |
0e0ccdec | 499 | goto out_unlock; |
fa9156ae | 500 | |
fa9156ae | 501 | ret = -EINVAL; |
0d02129e | 502 | if (start != part->bd_start_sect) |
fa9156ae CH |
503 | goto out_unlock; |
504 | ||
505 | ret = -EBUSY; | |
3d2e7989 | 506 | if (partition_overlaps(disk, start, length, partno)) |
fa9156ae CH |
507 | goto out_unlock; |
508 | ||
0d02129e | 509 | bdev_set_nr_sectors(part, length); |
fa9156ae CH |
510 | |
511 | ret = 0; | |
512 | out_unlock: | |
3d2e7989 | 513 | mutex_unlock(&disk->open_mutex); |
fa9156ae CH |
514 | return ret; |
515 | } | |
516 | ||
94ea4158 AV |
517 | static bool disk_unlock_native_capacity(struct gendisk *disk) |
518 | { | |
86416916 CH |
519 | if (!disk->fops->unlock_native_capacity || |
520 | test_and_set_bit(GD_NATIVE_CAPACITY, &disk->state)) { | |
94ea4158 AV |
521 | printk(KERN_CONT "truncated\n"); |
522 | return false; | |
523 | } | |
86416916 CH |
524 | |
525 | printk(KERN_CONT "enabling native capacity\n"); | |
526 | disk->fops->unlock_native_capacity(disk); | |
527 | return true; | |
94ea4158 AV |
528 | } |
529 | ||
d3c4a43d | 530 | void blk_drop_partitions(struct gendisk *disk) |
94ea4158 | 531 | { |
ad1eaa53 | 532 | struct block_device *part; |
6c4541a8 | 533 | unsigned long idx; |
94ea4158 | 534 | |
a8698707 | 535 | lockdep_assert_held(&disk->open_mutex); |
e669c1da | 536 | |
63c38d85 | 537 | xa_for_each_start(&disk->part_tbl, idx, part, 1) |
0d02129e | 538 | delete_partition(part); |
fe316bf2 JN |
539 | } |
540 | ||
0384264e | 541 | static bool blk_add_partition(struct gendisk *disk, |
f902b026 | 542 | struct parsed_partitions *state, int p) |
fe316bf2 | 543 | { |
f902b026 CH |
544 | sector_t size = state->parts[p].size; |
545 | sector_t from = state->parts[p].from; | |
0d02129e | 546 | struct block_device *part; |
f902b026 CH |
547 | |
548 | if (!size) | |
549 | return true; | |
550 | ||
551 | if (from >= get_capacity(disk)) { | |
552 | printk(KERN_WARNING | |
553 | "%s: p%d start %llu is beyond EOD, ", | |
554 | disk->disk_name, p, (unsigned long long) from); | |
555 | if (disk_unlock_native_capacity(disk)) | |
556 | return false; | |
557 | return true; | |
fe316bf2 JN |
558 | } |
559 | ||
f902b026 CH |
560 | if (from + size > get_capacity(disk)) { |
561 | printk(KERN_WARNING | |
562 | "%s: p%d size %llu extends beyond EOD, ", | |
563 | disk->disk_name, p, (unsigned long long) size); | |
fe316bf2 | 564 | |
f902b026 CH |
565 | if (disk_unlock_native_capacity(disk)) |
566 | return false; | |
567 | ||
568 | /* | |
569 | * We can not ignore partitions of broken tables created by for | |
570 | * example camera firmware, but we limit them to the end of the | |
571 | * disk to avoid creating invalid block devices. | |
572 | */ | |
573 | size = get_capacity(disk) - from; | |
574 | } | |
575 | ||
576 | part = add_partition(disk, p, from, size, state->parts[p].flags, | |
577 | &state->parts[p].info); | |
b7205307 | 578 | if (IS_ERR(part) && PTR_ERR(part) != -ENXIO) { |
f902b026 CH |
579 | printk(KERN_ERR " %s: p%d could not be added: %ld\n", |
580 | disk->disk_name, p, -PTR_ERR(part)); | |
581 | return true; | |
582 | } | |
583 | ||
74cc979c CH |
584 | if (IS_BUILTIN(CONFIG_BLK_DEV_MD) && |
585 | (state->parts[p].flags & ADDPART_FLAG_RAID)) | |
0d02129e | 586 | md_autodetect_dev(part->bd_dev); |
74cc979c | 587 | |
f902b026 CH |
588 | return true; |
589 | } | |
590 | ||
0384264e | 591 | static int blk_add_partitions(struct gendisk *disk) |
f902b026 CH |
592 | { |
593 | struct parsed_partitions *state; | |
a33df75c | 594 | int ret = -EAGAIN, p; |
fe316bf2 | 595 | |
1ebe2e5f | 596 | if (disk->flags & GENHD_FL_NO_PART) |
142fe8f4 CH |
597 | return 0; |
598 | ||
748008e1 ML |
599 | if (test_bit(GD_SUPPRESS_PART_SCAN, &disk->state)) |
600 | return 0; | |
601 | ||
0384264e | 602 | state = check_partition(disk); |
f902b026 | 603 | if (!state) |
94ea4158 AV |
604 | return 0; |
605 | if (IS_ERR(state)) { | |
606 | /* | |
f902b026 CH |
607 | * I/O error reading the partition table. If we tried to read |
608 | * beyond EOD, retry after unlocking the native capacity. | |
94ea4158 AV |
609 | */ |
610 | if (PTR_ERR(state) == -ENOSPC) { | |
611 | printk(KERN_WARNING "%s: partition table beyond EOD, ", | |
612 | disk->disk_name); | |
613 | if (disk_unlock_native_capacity(disk)) | |
f902b026 | 614 | return -EAGAIN; |
94ea4158 AV |
615 | } |
616 | return -EIO; | |
617 | } | |
5eac3eb3 | 618 | |
f902b026 | 619 | /* |
b7205307 | 620 | * Partitions are not supported on host managed zoned block devices. |
f902b026 | 621 | */ |
b7205307 CH |
622 | if (disk->queue->limits.zoned == BLK_ZONED_HM) { |
623 | pr_warn("%s: ignoring partition table on host managed zoned block device\n", | |
5eac3eb3 | 624 | disk->disk_name); |
f902b026 CH |
625 | ret = 0; |
626 | goto out_free_state; | |
5eac3eb3 DLM |
627 | } |
628 | ||
94ea4158 | 629 | /* |
f902b026 CH |
630 | * If we read beyond EOD, try unlocking native capacity even if the |
631 | * partition table was successfully read as we could be missing some | |
632 | * partitions. | |
94ea4158 AV |
633 | */ |
634 | if (state->access_beyond_eod) { | |
635 | printk(KERN_WARNING | |
636 | "%s: partition table partially beyond EOD, ", | |
637 | disk->disk_name); | |
638 | if (disk_unlock_native_capacity(disk)) | |
f902b026 | 639 | goto out_free_state; |
94ea4158 AV |
640 | } |
641 | ||
642 | /* tell userspace that the media / partition table may have changed */ | |
643 | kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); | |
644 | ||
f902b026 | 645 | for (p = 1; p < state->limit; p++) |
0384264e | 646 | if (!blk_add_partition(disk, state, p)) |
f902b026 | 647 | goto out_free_state; |
94ea4158 | 648 | |
f902b026 CH |
649 | ret = 0; |
650 | out_free_state: | |
ac2e5327 | 651 | free_partitions(state); |
f902b026 | 652 | return ret; |
fe316bf2 JN |
653 | } |
654 | ||
0384264e | 655 | int bdev_disk_changed(struct gendisk *disk, bool invalidate) |
630161cf | 656 | { |
630161cf CH |
657 | int ret = 0; |
658 | ||
659 | lockdep_assert_held(&disk->open_mutex); | |
660 | ||
50b4aecf | 661 | if (!disk_live(disk)) |
630161cf CH |
662 | return -ENXIO; |
663 | ||
664 | rescan: | |
665 | if (disk->open_partitions) | |
666 | return -EBUSY; | |
0384264e CH |
667 | sync_blockdev(disk->part0); |
668 | invalidate_bdev(disk->part0); | |
630161cf CH |
669 | blk_drop_partitions(disk); |
670 | ||
671 | clear_bit(GD_NEED_PART_SCAN, &disk->state); | |
672 | ||
673 | /* | |
674 | * Historically we only set the capacity to zero for devices that | |
675 | * support partitions (independ of actually having partitions created). | |
676 | * Doing that is rather inconsistent, but changing it broke legacy | |
677 | * udisks polling for legacy ide-cdrom devices. Use the crude check | |
678 | * below to get the sane behavior for most device while not breaking | |
679 | * userspace for this particular setup. | |
680 | */ | |
681 | if (invalidate) { | |
1ebe2e5f | 682 | if (!(disk->flags & GENHD_FL_NO_PART) || |
630161cf CH |
683 | !(disk->flags & GENHD_FL_REMOVABLE)) |
684 | set_capacity(disk, 0); | |
685 | } | |
686 | ||
687 | if (get_capacity(disk)) { | |
0384264e | 688 | ret = blk_add_partitions(disk); |
630161cf CH |
689 | if (ret == -EAGAIN) |
690 | goto rescan; | |
691 | } else if (invalidate) { | |
692 | /* | |
693 | * Tell userspace that the media / partition table may have | |
694 | * changed. | |
695 | */ | |
696 | kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); | |
697 | } | |
698 | ||
699 | return ret; | |
700 | } | |
701 | /* | |
702 | * Only exported for loop and dasd for historic reasons. Don't use in new | |
703 | * code! | |
704 | */ | |
705 | EXPORT_SYMBOL_GPL(bdev_disk_changed); | |
706 | ||
1a9fba3a | 707 | void *read_part_sector(struct parsed_partitions *state, sector_t n, Sector *p) |
d1a5f2b4 | 708 | { |
a08aa9bc | 709 | struct address_space *mapping = state->disk->part0->bd_inode->i_mapping; |
4fdc08d4 | 710 | struct folio *folio; |
94ea4158 | 711 | |
a08aa9bc | 712 | if (n >= get_capacity(state->disk)) { |
1a9fba3a | 713 | state->access_beyond_eod = true; |
98d8ba69 | 714 | goto out; |
94ea4158 | 715 | } |
1a9fba3a | 716 | |
4fdc08d4 MWO |
717 | folio = read_mapping_folio(mapping, n >> PAGE_SECTORS_SHIFT, NULL); |
718 | if (IS_ERR(folio)) | |
1a9fba3a | 719 | goto out; |
1a9fba3a | 720 | |
4fdc08d4 MWO |
721 | p->v = folio; |
722 | return folio_address(folio) + offset_in_folio(folio, n * SECTOR_SIZE); | |
1a9fba3a | 723 | out: |
94ea4158 AV |
724 | p->v = NULL; |
725 | return NULL; | |
726 | } |