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7#include <linux/fs.h>
8#include <linux/slab.h>
9#include <linux/ctype.h>
10#include <linux/genhd.h>
11#include <linux/vmalloc.h>
12#include <linux/blktrace_api.h>
13#include <linux/raid/detect.h>
14#include "check.h"
15
16static int (*check_part[])(struct parsed_partitions *) = {
17
18
19
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
33
34
35
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,
49#endif
50#ifdef CONFIG_SGI_PARTITION
51 sgi_partition,
52#endif
53#ifdef CONFIG_LDM_PARTITION
54 ldm_partition,
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
89static void bdev_set_nr_sectors(struct block_device *bdev, sector_t sectors)
90{
91 spin_lock(&bdev->bd_size_lock);
92 i_size_write(bdev->bd_inode, (loff_t)sectors << SECTOR_SHIFT);
93 spin_unlock(&bdev->bd_size_lock);
94}
95
96static 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
117static void free_partitions(struct parsed_partitions *state)
118{
119 vfree(state->parts);
120 kfree(state);
121}
122
123static 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
152
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
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 }
177
178 free_page((unsigned long)state->pp_buf);
179 free_partitions(state);
180 return ERR_PTR(res);
181}
182
183static ssize_t part_partition_show(struct device *dev,
184 struct device_attribute *attr, char *buf)
185{
186 return sprintf(buf, "%d\n", dev_to_bdev(dev)->bd_partno);
187}
188
189static ssize_t part_start_show(struct device *dev,
190 struct device_attribute *attr, char *buf)
191{
192 return sprintf(buf, "%llu\n", dev_to_bdev(dev)->bd_start_sect);
193}
194
195static ssize_t part_ro_show(struct device *dev,
196 struct device_attribute *attr, char *buf)
197{
198 return sprintf(buf, "%d\n", bdev_read_only(dev_to_bdev(dev)));
199}
200
201static ssize_t part_alignment_offset_show(struct device *dev,
202 struct device_attribute *attr, char *buf)
203{
204 struct block_device *bdev = dev_to_bdev(dev);
205
206 return sprintf(buf, "%u\n",
207 queue_limit_alignment_offset(&bdev->bd_disk->queue->limits,
208 bdev->bd_start_sect));
209}
210
211static ssize_t part_discard_alignment_show(struct device *dev,
212 struct device_attribute *attr, char *buf)
213{
214 struct block_device *bdev = dev_to_bdev(dev);
215
216 return sprintf(buf, "%u\n",
217 queue_limit_discard_alignment(&bdev->bd_disk->queue->limits,
218 bdev->bd_start_sect));
219}
220
221static DEVICE_ATTR(partition, 0444, part_partition_show, NULL);
222static DEVICE_ATTR(start, 0444, part_start_show, NULL);
223static DEVICE_ATTR(size, 0444, part_size_show, NULL);
224static DEVICE_ATTR(ro, 0444, part_ro_show, NULL);
225static DEVICE_ATTR(alignment_offset, 0444, part_alignment_offset_show, NULL);
226static DEVICE_ATTR(discard_alignment, 0444, part_discard_alignment_show, NULL);
227static DEVICE_ATTR(stat, 0444, part_stat_show, NULL);
228static DEVICE_ATTR(inflight, 0444, part_inflight_show, NULL);
229#ifdef CONFIG_FAIL_MAKE_REQUEST
230static struct device_attribute dev_attr_fail =
231 __ATTR(make-it-fail, 0644, part_fail_show, part_fail_store);
232#endif
233
234static 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
249static struct attribute_group part_attr_group = {
250 .attrs = part_attrs,
251};
252
253static 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
261static void part_release(struct device *dev)
262{
263 blk_free_devt(dev->devt);
264 bdput(dev_to_bdev(dev));
265}
266
267static int part_uevent(struct device *dev, struct kobj_uevent_env *env)
268{
269 struct block_device *part = dev_to_bdev(dev);
270
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);
274 return 0;
275}
276
277struct device_type part_type = {
278 .name = "partition",
279 .groups = part_attr_groups,
280 .release = part_release,
281 .uevent = part_uevent,
282};
283
284
285
286
287
288static void delete_partition(struct block_device *part)
289{
290 fsync_bdev(part);
291 __invalidate_device(part, true);
292
293 xa_erase(&part->bd_disk->part_tbl, part->bd_partno);
294 kobject_put(part->bd_holder_dir);
295 device_del(&part->bd_device);
296
297
298
299
300
301 remove_inode_hash(part->bd_inode);
302
303 put_device(&part->bd_device);
304}
305
306static ssize_t whole_disk_show(struct device *dev,
307 struct device_attribute *attr, char *buf)
308{
309 return 0;
310}
311static DEVICE_ATTR(whole_disk, 0444, whole_disk_show, NULL);
312
313
314
315
316
317static struct block_device *add_partition(struct gendisk *disk, int partno,
318 sector_t start, sector_t len, int flags,
319 struct partition_meta_info *info)
320{
321 dev_t devt = MKDEV(0, 0);
322 struct device *ddev = disk_to_dev(disk);
323 struct device *pdev;
324 struct block_device *bdev;
325 const char *dname;
326 int err;
327
328
329
330
331
332 if (partno >= disk_max_parts(disk))
333 return ERR_PTR(-EINVAL);
334
335
336
337
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);
347 blk_queue_set_zoned(disk, BLK_ZONED_NONE);
348 break;
349 case BLK_ZONED_NONE:
350 break;
351 }
352
353 if (xa_load(&disk->part_tbl, partno))
354 return ERR_PTR(-EBUSY);
355
356 bdev = bdev_alloc(disk, partno);
357 if (!bdev)
358 return ERR_PTR(-ENOMEM);
359
360 bdev->bd_start_sect = start;
361 bdev_set_nr_sectors(bdev, len);
362
363 if (info) {
364 err = -ENOMEM;
365 bdev->bd_meta_info = kmemdup(info, sizeof(*info), GFP_KERNEL);
366 if (!bdev->bd_meta_info)
367 goto out_bdput;
368 }
369
370 pdev = &bdev->bd_device;
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
382 err = blk_alloc_devt(bdev, &devt);
383 if (err)
384 goto out_put;
385 pdev->devt = devt;
386
387
388 dev_set_uevent_suppress(pdev, 1);
389 err = device_add(pdev);
390 if (err)
391 goto out_put;
392
393 err = -ENOMEM;
394 bdev->bd_holder_dir = kobject_create_and_add("holders", &pdev->kobj);
395 if (!bdev->bd_holder_dir)
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
406 err = xa_insert(&disk->part_tbl, partno, bdev, GFP_KERNEL);
407 if (err)
408 goto out_del;
409 bdev_add(bdev, devt);
410
411
412 if (!dev_get_uevent_suppress(ddev))
413 kobject_uevent(&pdev->kobj, KOBJ_ADD);
414 return bdev;
415
416out_bdput:
417 bdput(bdev);
418 return ERR_PTR(err);
419out_del:
420 kobject_put(bdev->bd_holder_dir);
421 device_del(pdev);
422out_put:
423 put_device(pdev);
424 return ERR_PTR(err);
425}
426
427static bool partition_overlaps(struct gendisk *disk, sector_t start,
428 sector_t length, int skip_partno)
429{
430 struct block_device *part;
431 bool overlap = false;
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 }
442 }
443 rcu_read_unlock();
444
445 return overlap;
446}
447
448int bdev_add_partition(struct block_device *bdev, int partno,
449 sector_t start, sector_t length)
450{
451 struct block_device *part;
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
465int bdev_del_partition(struct block_device *bdev, int partno)
466{
467 struct block_device *part;
468 int ret;
469
470 part = bdget_disk(bdev->bd_disk, partno);
471 if (!part)
472 return -ENXIO;
473
474 mutex_lock(&part->bd_mutex);
475 mutex_lock_nested(&bdev->bd_mutex, 1);
476
477 ret = -EBUSY;
478 if (part->bd_openers)
479 goto out_unlock;
480
481 delete_partition(part);
482 ret = 0;
483out_unlock:
484 mutex_unlock(&bdev->bd_mutex);
485 mutex_unlock(&part->bd_mutex);
486 bdput(part);
487 return ret;
488}
489
490int bdev_resize_partition(struct block_device *bdev, int partno,
491 sector_t start, sector_t length)
492{
493 struct block_device *part;
494 int ret = 0;
495
496 part = bdget_disk(bdev->bd_disk, partno);
497 if (!part)
498 return -ENXIO;
499
500 mutex_lock(&part->bd_mutex);
501 mutex_lock_nested(&bdev->bd_mutex, 1);
502 ret = -EINVAL;
503 if (start != part->bd_start_sect)
504 goto out_unlock;
505
506 ret = -EBUSY;
507 if (partition_overlaps(bdev->bd_disk, start, length, partno))
508 goto out_unlock;
509
510 bdev_set_nr_sectors(part, length);
511
512 ret = 0;
513out_unlock:
514 mutex_unlock(&part->bd_mutex);
515 mutex_unlock(&bdev->bd_mutex);
516 bdput(part);
517 return ret;
518}
519
520static 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
536void blk_drop_partitions(struct gendisk *disk)
537{
538 struct block_device *part;
539 unsigned long idx;
540
541 lockdep_assert_held(&disk->part0->bd_mutex);
542
543 xa_for_each_start(&disk->part_tbl, idx, part, 1) {
544 if (!bdgrab(part))
545 continue;
546 delete_partition(part);
547 bdput(part);
548 }
549}
550
551static bool blk_add_partition(struct gendisk *disk, struct block_device *bdev,
552 struct parsed_partitions *state, int p)
553{
554 sector_t size = state->parts[p].size;
555 sector_t from = state->parts[p].from;
556 struct block_device *part;
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;
568 }
569
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);
574
575 if (disk_unlock_native_capacity(disk))
576 return false;
577
578
579
580
581
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);
588 if (IS_ERR(part) && PTR_ERR(part) != -ENXIO) {
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
594 if (IS_BUILTIN(CONFIG_BLK_DEV_MD) &&
595 (state->parts[p].flags & ADDPART_FLAG_RAID))
596 md_autodetect_dev(part->bd_dev);
597
598 return true;
599}
600
601int blk_add_partitions(struct gendisk *disk, struct block_device *bdev)
602{
603 struct parsed_partitions *state;
604 int ret = -EAGAIN, p;
605
606 if (!disk_part_scan_enabled(disk))
607 return 0;
608
609 state = check_partition(disk, bdev);
610 if (!state)
611 return 0;
612 if (IS_ERR(state)) {
613
614
615
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))
621 return -EAGAIN;
622 }
623 return -EIO;
624 }
625
626
627
628
629 if (disk->queue->limits.zoned == BLK_ZONED_HM) {
630 pr_warn("%s: ignoring partition table on host managed zoned block device\n",
631 disk->disk_name);
632 ret = 0;
633 goto out_free_state;
634 }
635
636
637
638
639
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))
646 goto out_free_state;
647 }
648
649
650 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
651
652 for (p = 1; p < state->limit; p++)
653 if (!blk_add_partition(disk, bdev, state, p))
654 goto out_free_state;
655
656 ret = 0;
657out_free_state:
658 free_partitions(state);
659 return ret;
660}
661
662void *read_part_sector(struct parsed_partitions *state, sector_t n, Sector *p)
663{
664 struct address_space *mapping = state->bdev->bd_inode->i_mapping;
665 struct page *page;
666
667 if (n >= get_capacity(state->bdev->bd_disk)) {
668 state->access_beyond_eod = true;
669 return NULL;
670 }
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);
682out_put_page:
683 put_page(page);
684out:
685 p->v = NULL;
686 return NULL;
687}
688
