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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> |
a9f215d7 | 8 | #include <linux/major.h> |
94ea4158 | 9 | #include <linux/slab.h> |
94ea4158 AV |
10 | #include <linux/ctype.h> |
11 | #include <linux/genhd.h> | |
387048bf | 12 | #include <linux/vmalloc.h> |
94ea4158 | 13 | #include <linux/blktrace_api.h> |
74cc979c | 14 | #include <linux/raid/detect.h> |
387048bf CH |
15 | #include "check.h" |
16 | ||
17 | static int (*check_part[])(struct parsed_partitions *) = { | |
18 | /* | |
19 | * Probe partition formats with tables at disk address 0 | |
20 | * that also have an ADFS boot block at 0xdc0. | |
21 | */ | |
22 | #ifdef CONFIG_ACORN_PARTITION_ICS | |
23 | adfspart_check_ICS, | |
24 | #endif | |
25 | #ifdef CONFIG_ACORN_PARTITION_POWERTEC | |
26 | adfspart_check_POWERTEC, | |
27 | #endif | |
28 | #ifdef CONFIG_ACORN_PARTITION_EESOX | |
29 | adfspart_check_EESOX, | |
30 | #endif | |
31 | ||
32 | /* | |
33 | * Now move on to formats that only have partition info at | |
34 | * disk address 0xdc0. Since these may also have stale | |
35 | * PC/BIOS partition tables, they need to come before | |
36 | * the msdos entry. | |
37 | */ | |
38 | #ifdef CONFIG_ACORN_PARTITION_CUMANA | |
39 | adfspart_check_CUMANA, | |
40 | #endif | |
41 | #ifdef CONFIG_ACORN_PARTITION_ADFS | |
42 | adfspart_check_ADFS, | |
43 | #endif | |
44 | ||
45 | #ifdef CONFIG_CMDLINE_PARTITION | |
46 | cmdline_partition, | |
47 | #endif | |
48 | #ifdef CONFIG_EFI_PARTITION | |
49 | efi_partition, /* this must come before msdos */ | |
50 | #endif | |
51 | #ifdef CONFIG_SGI_PARTITION | |
52 | sgi_partition, | |
53 | #endif | |
54 | #ifdef CONFIG_LDM_PARTITION | |
55 | ldm_partition, /* this must come before msdos */ | |
56 | #endif | |
57 | #ifdef CONFIG_MSDOS_PARTITION | |
58 | msdos_partition, | |
59 | #endif | |
60 | #ifdef CONFIG_OSF_PARTITION | |
61 | osf_partition, | |
62 | #endif | |
63 | #ifdef CONFIG_SUN_PARTITION | |
64 | sun_partition, | |
65 | #endif | |
66 | #ifdef CONFIG_AMIGA_PARTITION | |
67 | amiga_partition, | |
68 | #endif | |
69 | #ifdef CONFIG_ATARI_PARTITION | |
70 | atari_partition, | |
71 | #endif | |
72 | #ifdef CONFIG_MAC_PARTITION | |
73 | mac_partition, | |
74 | #endif | |
75 | #ifdef CONFIG_ULTRIX_PARTITION | |
76 | ultrix_partition, | |
77 | #endif | |
78 | #ifdef CONFIG_IBM_PARTITION | |
79 | ibm_partition, | |
80 | #endif | |
81 | #ifdef CONFIG_KARMA_PARTITION | |
82 | karma_partition, | |
83 | #endif | |
84 | #ifdef CONFIG_SYSV68_PARTITION | |
85 | sysv68_partition, | |
86 | #endif | |
87 | NULL | |
88 | }; | |
89 | ||
a782483c CH |
90 | static void bdev_set_nr_sectors(struct block_device *bdev, sector_t sectors) |
91 | { | |
0f472277 | 92 | spin_lock(&bdev->bd_size_lock); |
a782483c | 93 | i_size_write(bdev->bd_inode, (loff_t)sectors << SECTOR_SHIFT); |
0f472277 | 94 | spin_unlock(&bdev->bd_size_lock); |
a782483c CH |
95 | } |
96 | ||
387048bf CH |
97 | static struct parsed_partitions *allocate_partitions(struct gendisk *hd) |
98 | { | |
99 | struct parsed_partitions *state; | |
100 | int nr; | |
101 | ||
102 | state = kzalloc(sizeof(*state), GFP_KERNEL); | |
103 | if (!state) | |
104 | return NULL; | |
105 | ||
106 | nr = disk_max_parts(hd); | |
107 | state->parts = vzalloc(array_size(nr, sizeof(state->parts[0]))); | |
108 | if (!state->parts) { | |
109 | kfree(state); | |
110 | return NULL; | |
111 | } | |
112 | ||
113 | state->limit = nr; | |
114 | ||
115 | return state; | |
116 | } | |
117 | ||
118 | static void free_partitions(struct parsed_partitions *state) | |
119 | { | |
120 | vfree(state->parts); | |
121 | kfree(state); | |
122 | } | |
123 | ||
0384264e | 124 | static struct parsed_partitions *check_partition(struct gendisk *hd) |
387048bf CH |
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 | ||
a08aa9bc | 139 | state->disk = hd; |
1d703547 | 140 | snprintf(state->name, BDEVNAME_SIZE, "%s", hd->disk_name); |
387048bf CH |
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 | { | |
9d3b8813 | 263 | put_disk(dev_to_bdev(dev)->bd_disk); |
2f4731dc | 264 | iput(dev_to_bdev(dev)->bd_inode); |
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 | ||
d3c4a43d | 284 | static void delete_partition(struct block_device *part) |
94ea4158 | 285 | { |
a45e43ca CH |
286 | lockdep_assert_held(&part->bd_disk->open_mutex); |
287 | ||
473338be CH |
288 | fsync_bdev(part); |
289 | __invalidate_device(part, true); | |
290 | ||
a33df75c | 291 | xa_erase(&part->bd_disk->part_tbl, part->bd_partno); |
0d02129e CH |
292 | kobject_put(part->bd_holder_dir); |
293 | device_del(&part->bd_device); | |
94ea4158 | 294 | |
6fcc44d1 | 295 | /* |
22ae8ce8 CH |
296 | * Remove the block device from the inode hash, so that it cannot be |
297 | * looked up any more even when openers still hold references. | |
6fcc44d1 | 298 | */ |
0d02129e | 299 | remove_inode_hash(part->bd_inode); |
22ae8ce8 | 300 | |
0d02129e | 301 | put_device(&part->bd_device); |
94ea4158 AV |
302 | } |
303 | ||
304 | static ssize_t whole_disk_show(struct device *dev, | |
305 | struct device_attribute *attr, char *buf) | |
306 | { | |
307 | return 0; | |
308 | } | |
5657a819 | 309 | static DEVICE_ATTR(whole_disk, 0444, whole_disk_show, NULL); |
94ea4158 | 310 | |
6d2cf6f2 | 311 | /* |
a8698707 | 312 | * Must be called either with open_mutex held, before a disk can be opened or |
6d2cf6f2 BVA |
313 | * after all disk users are gone. |
314 | */ | |
0d02129e | 315 | static struct block_device *add_partition(struct gendisk *disk, int partno, |
94ea4158 AV |
316 | sector_t start, sector_t len, int flags, |
317 | struct partition_meta_info *info) | |
318 | { | |
94ea4158 AV |
319 | dev_t devt = MKDEV(0, 0); |
320 | struct device *ddev = disk_to_dev(disk); | |
321 | struct device *pdev; | |
22ae8ce8 | 322 | struct block_device *bdev; |
94ea4158 AV |
323 | const char *dname; |
324 | int err; | |
325 | ||
0e0ccdec CH |
326 | lockdep_assert_held(&disk->open_mutex); |
327 | ||
e82fc785 ML |
328 | if (partno >= disk_max_parts(disk)) |
329 | return ERR_PTR(-EINVAL); | |
330 | ||
b7205307 CH |
331 | /* |
332 | * Partitions are not supported on zoned block devices that are used as | |
333 | * such. | |
334 | */ | |
335 | switch (disk->queue->limits.zoned) { | |
336 | case BLK_ZONED_HM: | |
337 | pr_warn("%s: partitions not supported on host managed zoned block device\n", | |
338 | disk->disk_name); | |
339 | return ERR_PTR(-ENXIO); | |
340 | case BLK_ZONED_HA: | |
341 | pr_info("%s: disabling host aware zoned block device support due to partitions\n", | |
342 | disk->disk_name); | |
eafc63a9 | 343 | blk_queue_set_zoned(disk, BLK_ZONED_NONE); |
b7205307 CH |
344 | break; |
345 | case BLK_ZONED_NONE: | |
346 | break; | |
347 | } | |
348 | ||
a33df75c | 349 | if (xa_load(&disk->part_tbl, partno)) |
94ea4158 AV |
350 | return ERR_PTR(-EBUSY); |
351 | ||
9d3b8813 CH |
352 | /* ensure we always have a reference to the whole disk */ |
353 | get_device(disk_to_dev(disk)); | |
354 | ||
355 | err = -ENOMEM; | |
22ae8ce8 CH |
356 | bdev = bdev_alloc(disk, partno); |
357 | if (!bdev) | |
9d3b8813 | 358 | goto out_put_disk; |
c83f6bf9 | 359 | |
29ff57c6 | 360 | bdev->bd_start_sect = start; |
a782483c | 361 | bdev_set_nr_sectors(bdev, len); |
94ea4158 | 362 | |
0d02129e | 363 | pdev = &bdev->bd_device; |
94ea4158 AV |
364 | dname = dev_name(ddev); |
365 | if (isdigit(dname[strlen(dname) - 1])) | |
366 | dev_set_name(pdev, "%sp%d", dname, partno); | |
367 | else | |
368 | dev_set_name(pdev, "%s%d", dname, partno); | |
369 | ||
370 | device_initialize(pdev); | |
371 | pdev->class = &block_class; | |
372 | pdev->type = &part_type; | |
373 | pdev->parent = ddev; | |
374 | ||
7c3f828b CH |
375 | /* in consecutive minor range? */ |
376 | if (bdev->bd_partno < disk->minors) { | |
377 | devt = MKDEV(disk->major, disk->first_minor + bdev->bd_partno); | |
378 | } else { | |
379 | err = blk_alloc_ext_minor(); | |
380 | if (err < 0) | |
381 | goto out_put; | |
382 | devt = MKDEV(BLOCK_EXT_MAJOR, err); | |
383 | } | |
94ea4158 AV |
384 | pdev->devt = devt; |
385 | ||
0468c532 CH |
386 | if (info) { |
387 | err = -ENOMEM; | |
388 | bdev->bd_meta_info = kmemdup(info, sizeof(*info), GFP_KERNEL); | |
389 | if (!bdev->bd_meta_info) | |
390 | goto out_put; | |
391 | } | |
392 | ||
94ea4158 AV |
393 | /* delay uevent until 'holders' subdir is created */ |
394 | dev_set_uevent_suppress(pdev, 1); | |
395 | err = device_add(pdev); | |
396 | if (err) | |
397 | goto out_put; | |
398 | ||
399 | err = -ENOMEM; | |
1bdd5ae0 CH |
400 | bdev->bd_holder_dir = kobject_create_and_add("holders", &pdev->kobj); |
401 | if (!bdev->bd_holder_dir) | |
94ea4158 AV |
402 | goto out_del; |
403 | ||
404 | dev_set_uevent_suppress(pdev, 0); | |
405 | if (flags & ADDPART_FLAG_WHOLEDISK) { | |
406 | err = device_create_file(pdev, &dev_attr_whole_disk); | |
407 | if (err) | |
408 | goto out_del; | |
409 | } | |
410 | ||
411 | /* everything is up and running, commence */ | |
a33df75c CH |
412 | err = xa_insert(&disk->part_tbl, partno, bdev, GFP_KERNEL); |
413 | if (err) | |
414 | goto out_del; | |
22ae8ce8 | 415 | bdev_add(bdev, devt); |
94ea4158 AV |
416 | |
417 | /* suppress uevent if the disk suppresses it */ | |
418 | if (!dev_get_uevent_suppress(ddev)) | |
419 | kobject_uevent(&pdev->kobj, KOBJ_ADD); | |
0d02129e | 420 | return bdev; |
94ea4158 | 421 | |
94ea4158 | 422 | out_del: |
1bdd5ae0 | 423 | kobject_put(bdev->bd_holder_dir); |
94ea4158 AV |
424 | device_del(pdev); |
425 | out_put: | |
426 | put_device(pdev); | |
9fbfabfd | 427 | return ERR_PTR(err); |
9d3b8813 CH |
428 | out_put_disk: |
429 | put_disk(disk); | |
94ea4158 AV |
430 | return ERR_PTR(err); |
431 | } | |
432 | ||
fa9156ae CH |
433 | static bool partition_overlaps(struct gendisk *disk, sector_t start, |
434 | sector_t length, int skip_partno) | |
435 | { | |
ad1eaa53 | 436 | struct block_device *part; |
fa9156ae | 437 | bool overlap = false; |
e3069123 CH |
438 | unsigned long idx; |
439 | ||
440 | rcu_read_lock(); | |
441 | xa_for_each_start(&disk->part_tbl, idx, part, 1) { | |
442 | if (part->bd_partno != skip_partno && | |
443 | start < part->bd_start_sect + bdev_nr_sectors(part) && | |
444 | start + length > part->bd_start_sect) { | |
445 | overlap = true; | |
446 | break; | |
447 | } | |
fa9156ae | 448 | } |
e3069123 | 449 | rcu_read_unlock(); |
fa9156ae | 450 | |
fa9156ae CH |
451 | return overlap; |
452 | } | |
453 | ||
7f6be376 CH |
454 | int bdev_add_partition(struct gendisk *disk, int partno, sector_t start, |
455 | sector_t length) | |
fa9156ae | 456 | { |
0d02129e | 457 | struct block_device *part; |
b5cfbd35 | 458 | int ret; |
fa9156ae | 459 | |
b5cfbd35 | 460 | mutex_lock(&disk->open_mutex); |
50b4aecf | 461 | if (!disk_live(disk)) { |
b5cfbd35 YY |
462 | ret = -ENXIO; |
463 | goto out; | |
464 | } | |
465 | ||
466 | if (partition_overlaps(disk, start, length, -1)) { | |
467 | ret = -EBUSY; | |
468 | goto out; | |
fa9156ae CH |
469 | } |
470 | ||
b5cfbd35 | 471 | part = add_partition(disk, partno, start, length, |
fa9156ae | 472 | ADDPART_FLAG_NONE, NULL); |
b5cfbd35 YY |
473 | ret = PTR_ERR_OR_ZERO(part); |
474 | out: | |
475 | mutex_unlock(&disk->open_mutex); | |
476 | return ret; | |
fa9156ae CH |
477 | } |
478 | ||
926fbb16 | 479 | int bdev_del_partition(struct gendisk *disk, int partno) |
fa9156ae | 480 | { |
0e0ccdec CH |
481 | struct block_device *part = NULL; |
482 | int ret = -ENXIO; | |
fa9156ae | 483 | |
926fbb16 CH |
484 | mutex_lock(&disk->open_mutex); |
485 | part = xa_load(&disk->part_tbl, partno); | |
0e0ccdec CH |
486 | if (!part) |
487 | goto out_unlock; | |
08fc1ab6 | 488 | |
fa9156ae | 489 | ret = -EBUSY; |
0d02129e | 490 | if (part->bd_openers) |
fa9156ae CH |
491 | goto out_unlock; |
492 | ||
8328eb28 | 493 | delete_partition(part); |
fa9156ae CH |
494 | ret = 0; |
495 | out_unlock: | |
926fbb16 | 496 | mutex_unlock(&disk->open_mutex); |
fa9156ae CH |
497 | return ret; |
498 | } | |
499 | ||
3d2e7989 CH |
500 | int bdev_resize_partition(struct gendisk *disk, int partno, sector_t start, |
501 | sector_t length) | |
fa9156ae | 502 | { |
0e0ccdec CH |
503 | struct block_device *part = NULL; |
504 | int ret = -ENXIO; | |
fa9156ae | 505 | |
3d2e7989 CH |
506 | mutex_lock(&disk->open_mutex); |
507 | part = xa_load(&disk->part_tbl, partno); | |
fa9156ae | 508 | if (!part) |
0e0ccdec | 509 | goto out_unlock; |
fa9156ae | 510 | |
fa9156ae | 511 | ret = -EINVAL; |
0d02129e | 512 | if (start != part->bd_start_sect) |
fa9156ae CH |
513 | goto out_unlock; |
514 | ||
515 | ret = -EBUSY; | |
3d2e7989 | 516 | if (partition_overlaps(disk, start, length, partno)) |
fa9156ae CH |
517 | goto out_unlock; |
518 | ||
0d02129e | 519 | bdev_set_nr_sectors(part, length); |
fa9156ae CH |
520 | |
521 | ret = 0; | |
522 | out_unlock: | |
3d2e7989 | 523 | mutex_unlock(&disk->open_mutex); |
fa9156ae CH |
524 | return ret; |
525 | } | |
526 | ||
94ea4158 AV |
527 | static bool disk_unlock_native_capacity(struct gendisk *disk) |
528 | { | |
529 | const struct block_device_operations *bdops = disk->fops; | |
530 | ||
531 | if (bdops->unlock_native_capacity && | |
532 | !(disk->flags & GENHD_FL_NATIVE_CAPACITY)) { | |
533 | printk(KERN_CONT "enabling native capacity\n"); | |
534 | bdops->unlock_native_capacity(disk); | |
535 | disk->flags |= GENHD_FL_NATIVE_CAPACITY; | |
536 | return true; | |
537 | } else { | |
538 | printk(KERN_CONT "truncated\n"); | |
539 | return false; | |
540 | } | |
541 | } | |
542 | ||
d3c4a43d | 543 | void blk_drop_partitions(struct gendisk *disk) |
94ea4158 | 544 | { |
ad1eaa53 | 545 | struct block_device *part; |
6c4541a8 | 546 | unsigned long idx; |
94ea4158 | 547 | |
a8698707 | 548 | lockdep_assert_held(&disk->open_mutex); |
e669c1da | 549 | |
63c38d85 | 550 | xa_for_each_start(&disk->part_tbl, idx, part, 1) |
0d02129e | 551 | delete_partition(part); |
fe316bf2 JN |
552 | } |
553 | ||
0384264e | 554 | static bool blk_add_partition(struct gendisk *disk, |
f902b026 | 555 | struct parsed_partitions *state, int p) |
fe316bf2 | 556 | { |
f902b026 CH |
557 | sector_t size = state->parts[p].size; |
558 | sector_t from = state->parts[p].from; | |
0d02129e | 559 | struct block_device *part; |
f902b026 CH |
560 | |
561 | if (!size) | |
562 | return true; | |
563 | ||
564 | if (from >= get_capacity(disk)) { | |
565 | printk(KERN_WARNING | |
566 | "%s: p%d start %llu is beyond EOD, ", | |
567 | disk->disk_name, p, (unsigned long long) from); | |
568 | if (disk_unlock_native_capacity(disk)) | |
569 | return false; | |
570 | return true; | |
fe316bf2 JN |
571 | } |
572 | ||
f902b026 CH |
573 | if (from + size > get_capacity(disk)) { |
574 | printk(KERN_WARNING | |
575 | "%s: p%d size %llu extends beyond EOD, ", | |
576 | disk->disk_name, p, (unsigned long long) size); | |
fe316bf2 | 577 | |
f902b026 CH |
578 | if (disk_unlock_native_capacity(disk)) |
579 | return false; | |
580 | ||
581 | /* | |
582 | * We can not ignore partitions of broken tables created by for | |
583 | * example camera firmware, but we limit them to the end of the | |
584 | * disk to avoid creating invalid block devices. | |
585 | */ | |
586 | size = get_capacity(disk) - from; | |
587 | } | |
588 | ||
589 | part = add_partition(disk, p, from, size, state->parts[p].flags, | |
590 | &state->parts[p].info); | |
b7205307 | 591 | if (IS_ERR(part) && PTR_ERR(part) != -ENXIO) { |
f902b026 CH |
592 | printk(KERN_ERR " %s: p%d could not be added: %ld\n", |
593 | disk->disk_name, p, -PTR_ERR(part)); | |
594 | return true; | |
595 | } | |
596 | ||
74cc979c CH |
597 | if (IS_BUILTIN(CONFIG_BLK_DEV_MD) && |
598 | (state->parts[p].flags & ADDPART_FLAG_RAID)) | |
0d02129e | 599 | md_autodetect_dev(part->bd_dev); |
74cc979c | 600 | |
f902b026 CH |
601 | return true; |
602 | } | |
603 | ||
0384264e | 604 | static int blk_add_partitions(struct gendisk *disk) |
f902b026 CH |
605 | { |
606 | struct parsed_partitions *state; | |
a33df75c | 607 | int ret = -EAGAIN, p; |
fe316bf2 | 608 | |
142fe8f4 CH |
609 | if (!disk_part_scan_enabled(disk)) |
610 | return 0; | |
611 | ||
0384264e | 612 | state = check_partition(disk); |
f902b026 | 613 | if (!state) |
94ea4158 AV |
614 | return 0; |
615 | if (IS_ERR(state)) { | |
616 | /* | |
f902b026 CH |
617 | * I/O error reading the partition table. If we tried to read |
618 | * beyond EOD, retry after unlocking the native capacity. | |
94ea4158 AV |
619 | */ |
620 | if (PTR_ERR(state) == -ENOSPC) { | |
621 | printk(KERN_WARNING "%s: partition table beyond EOD, ", | |
622 | disk->disk_name); | |
623 | if (disk_unlock_native_capacity(disk)) | |
f902b026 | 624 | return -EAGAIN; |
94ea4158 AV |
625 | } |
626 | return -EIO; | |
627 | } | |
5eac3eb3 | 628 | |
f902b026 | 629 | /* |
b7205307 | 630 | * Partitions are not supported on host managed zoned block devices. |
f902b026 | 631 | */ |
b7205307 CH |
632 | if (disk->queue->limits.zoned == BLK_ZONED_HM) { |
633 | pr_warn("%s: ignoring partition table on host managed zoned block device\n", | |
5eac3eb3 | 634 | disk->disk_name); |
f902b026 CH |
635 | ret = 0; |
636 | goto out_free_state; | |
5eac3eb3 DLM |
637 | } |
638 | ||
94ea4158 | 639 | /* |
f902b026 CH |
640 | * If we read beyond EOD, try unlocking native capacity even if the |
641 | * partition table was successfully read as we could be missing some | |
642 | * partitions. | |
94ea4158 AV |
643 | */ |
644 | if (state->access_beyond_eod) { | |
645 | printk(KERN_WARNING | |
646 | "%s: partition table partially beyond EOD, ", | |
647 | disk->disk_name); | |
648 | if (disk_unlock_native_capacity(disk)) | |
f902b026 | 649 | goto out_free_state; |
94ea4158 AV |
650 | } |
651 | ||
652 | /* tell userspace that the media / partition table may have changed */ | |
653 | kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); | |
654 | ||
f902b026 | 655 | for (p = 1; p < state->limit; p++) |
0384264e | 656 | if (!blk_add_partition(disk, state, p)) |
f902b026 | 657 | goto out_free_state; |
94ea4158 | 658 | |
f902b026 CH |
659 | ret = 0; |
660 | out_free_state: | |
ac2e5327 | 661 | free_partitions(state); |
f902b026 | 662 | return ret; |
fe316bf2 JN |
663 | } |
664 | ||
0384264e | 665 | int bdev_disk_changed(struct gendisk *disk, bool invalidate) |
630161cf | 666 | { |
630161cf CH |
667 | int ret = 0; |
668 | ||
669 | lockdep_assert_held(&disk->open_mutex); | |
670 | ||
50b4aecf | 671 | if (!disk_live(disk)) |
630161cf CH |
672 | return -ENXIO; |
673 | ||
674 | rescan: | |
675 | if (disk->open_partitions) | |
676 | return -EBUSY; | |
0384264e CH |
677 | sync_blockdev(disk->part0); |
678 | invalidate_bdev(disk->part0); | |
630161cf CH |
679 | blk_drop_partitions(disk); |
680 | ||
681 | clear_bit(GD_NEED_PART_SCAN, &disk->state); | |
682 | ||
683 | /* | |
684 | * Historically we only set the capacity to zero for devices that | |
685 | * support partitions (independ of actually having partitions created). | |
686 | * Doing that is rather inconsistent, but changing it broke legacy | |
687 | * udisks polling for legacy ide-cdrom devices. Use the crude check | |
688 | * below to get the sane behavior for most device while not breaking | |
689 | * userspace for this particular setup. | |
690 | */ | |
691 | if (invalidate) { | |
692 | if (disk_part_scan_enabled(disk) || | |
693 | !(disk->flags & GENHD_FL_REMOVABLE)) | |
694 | set_capacity(disk, 0); | |
695 | } | |
696 | ||
697 | if (get_capacity(disk)) { | |
0384264e | 698 | ret = blk_add_partitions(disk); |
630161cf CH |
699 | if (ret == -EAGAIN) |
700 | goto rescan; | |
701 | } else if (invalidate) { | |
702 | /* | |
703 | * Tell userspace that the media / partition table may have | |
704 | * changed. | |
705 | */ | |
706 | kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); | |
707 | } | |
708 | ||
709 | return ret; | |
710 | } | |
711 | /* | |
712 | * Only exported for loop and dasd for historic reasons. Don't use in new | |
713 | * code! | |
714 | */ | |
715 | EXPORT_SYMBOL_GPL(bdev_disk_changed); | |
716 | ||
1a9fba3a | 717 | void *read_part_sector(struct parsed_partitions *state, sector_t n, Sector *p) |
d1a5f2b4 | 718 | { |
a08aa9bc | 719 | struct address_space *mapping = state->disk->part0->bd_inode->i_mapping; |
94ea4158 AV |
720 | struct page *page; |
721 | ||
a08aa9bc | 722 | if (n >= get_capacity(state->disk)) { |
1a9fba3a CH |
723 | state->access_beyond_eod = true; |
724 | return NULL; | |
94ea4158 | 725 | } |
1a9fba3a CH |
726 | |
727 | page = read_mapping_page(mapping, | |
728 | (pgoff_t)(n >> (PAGE_SHIFT - 9)), NULL); | |
729 | if (IS_ERR(page)) | |
730 | goto out; | |
731 | if (PageError(page)) | |
732 | goto out_put_page; | |
733 | ||
734 | p->v = page; | |
735 | return (unsigned char *)page_address(page) + | |
736 | ((n & ((1 << (PAGE_SHIFT - 9)) - 1)) << SECTOR_SHIFT); | |
737 | out_put_page: | |
738 | put_page(page); | |
739 | out: | |
94ea4158 AV |
740 | p->v = NULL; |
741 | return NULL; | |
742 | } |