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13#include <linux/init.h>
14#include <linux/module.h>
15#include <linux/fs.h>
16#include <linux/slab.h>
17#include <linux/kmod.h>
18#include <linux/ctype.h>
19#include <linux/genhd.h>
20#include <linux/blktrace_api.h>
21
22#include "partitions/check.h"
23
24#ifdef CONFIG_BLK_DEV_MD
25extern void md_autodetect_dev(dev_t dev);
26#endif
27
28
29
30
31
32
33
34
35char *disk_name(struct gendisk *hd, int partno, char *buf)
36{
37 if (!partno)
38 snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name);
39 else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1]))
40 snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, partno);
41 else
42 snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, partno);
43
44 return buf;
45}
46
47const char *bdevname(struct block_device *bdev, char *buf)
48{
49 return disk_name(bdev->bd_disk, bdev->bd_part->partno, buf);
50}
51
52EXPORT_SYMBOL(bdevname);
53
54const char *bio_devname(struct bio *bio, char *buf)
55{
56 return disk_name(bio->bi_disk, bio->bi_partno, buf);
57}
58EXPORT_SYMBOL(bio_devname);
59
60
61
62
63
64
65const char *__bdevname(dev_t dev, char *buffer)
66{
67 scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",
68 MAJOR(dev), MINOR(dev));
69 return buffer;
70}
71
72EXPORT_SYMBOL(__bdevname);
73
74static ssize_t part_partition_show(struct device *dev,
75 struct device_attribute *attr, char *buf)
76{
77 struct hd_struct *p = dev_to_part(dev);
78
79 return sprintf(buf, "%d\n", p->partno);
80}
81
82static ssize_t part_start_show(struct device *dev,
83 struct device_attribute *attr, char *buf)
84{
85 struct hd_struct *p = dev_to_part(dev);
86
87 return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect);
88}
89
90ssize_t part_size_show(struct device *dev,
91 struct device_attribute *attr, char *buf)
92{
93 struct hd_struct *p = dev_to_part(dev);
94 return sprintf(buf, "%llu\n",(unsigned long long)part_nr_sects_read(p));
95}
96
97static ssize_t part_ro_show(struct device *dev,
98 struct device_attribute *attr, char *buf)
99{
100 struct hd_struct *p = dev_to_part(dev);
101 return sprintf(buf, "%d\n", p->policy ? 1 : 0);
102}
103
104static ssize_t part_alignment_offset_show(struct device *dev,
105 struct device_attribute *attr, char *buf)
106{
107 struct hd_struct *p = dev_to_part(dev);
108 return sprintf(buf, "%llu\n", (unsigned long long)p->alignment_offset);
109}
110
111static ssize_t part_discard_alignment_show(struct device *dev,
112 struct device_attribute *attr, char *buf)
113{
114 struct hd_struct *p = dev_to_part(dev);
115 return sprintf(buf, "%u\n", p->discard_alignment);
116}
117
118ssize_t part_stat_show(struct device *dev,
119 struct device_attribute *attr, char *buf)
120{
121 struct hd_struct *p = dev_to_part(dev);
122 struct request_queue *q = part_to_disk(p)->queue;
123 unsigned int inflight;
124
125 inflight = part_in_flight(q, p);
126 return sprintf(buf,
127 "%8lu %8lu %8llu %8u "
128 "%8lu %8lu %8llu %8u "
129 "%8u %8u %8u "
130 "%8lu %8lu %8llu %8u "
131 "%8lu %8u"
132 "\n",
133 part_stat_read(p, ios[STAT_READ]),
134 part_stat_read(p, merges[STAT_READ]),
135 (unsigned long long)part_stat_read(p, sectors[STAT_READ]),
136 (unsigned int)part_stat_read_msecs(p, STAT_READ),
137 part_stat_read(p, ios[STAT_WRITE]),
138 part_stat_read(p, merges[STAT_WRITE]),
139 (unsigned long long)part_stat_read(p, sectors[STAT_WRITE]),
140 (unsigned int)part_stat_read_msecs(p, STAT_WRITE),
141 inflight,
142 jiffies_to_msecs(part_stat_read(p, io_ticks)),
143 jiffies_to_msecs(part_stat_read(p, time_in_queue)),
144 part_stat_read(p, ios[STAT_DISCARD]),
145 part_stat_read(p, merges[STAT_DISCARD]),
146 (unsigned long long)part_stat_read(p, sectors[STAT_DISCARD]),
147 (unsigned int)part_stat_read_msecs(p, STAT_DISCARD),
148 part_stat_read(p, ios[STAT_FLUSH]),
149 (unsigned int)part_stat_read_msecs(p, STAT_FLUSH));
150}
151
152ssize_t part_inflight_show(struct device *dev, struct device_attribute *attr,
153 char *buf)
154{
155 struct hd_struct *p = dev_to_part(dev);
156 struct request_queue *q = part_to_disk(p)->queue;
157 unsigned int inflight[2];
158
159 part_in_flight_rw(q, p, inflight);
160 return sprintf(buf, "%8u %8u\n", inflight[0], inflight[1]);
161}
162
163#ifdef CONFIG_FAIL_MAKE_REQUEST
164ssize_t part_fail_show(struct device *dev,
165 struct device_attribute *attr, char *buf)
166{
167 struct hd_struct *p = dev_to_part(dev);
168
169 return sprintf(buf, "%d\n", p->make_it_fail);
170}
171
172ssize_t part_fail_store(struct device *dev,
173 struct device_attribute *attr,
174 const char *buf, size_t count)
175{
176 struct hd_struct *p = dev_to_part(dev);
177 int i;
178
179 if (count > 0 && sscanf(buf, "%d", &i) > 0)
180 p->make_it_fail = (i == 0) ? 0 : 1;
181
182 return count;
183}
184#endif
185
186static DEVICE_ATTR(partition, 0444, part_partition_show, NULL);
187static DEVICE_ATTR(start, 0444, part_start_show, NULL);
188static DEVICE_ATTR(size, 0444, part_size_show, NULL);
189static DEVICE_ATTR(ro, 0444, part_ro_show, NULL);
190static DEVICE_ATTR(alignment_offset, 0444, part_alignment_offset_show, NULL);
191static DEVICE_ATTR(discard_alignment, 0444, part_discard_alignment_show, NULL);
192static DEVICE_ATTR(stat, 0444, part_stat_show, NULL);
193static DEVICE_ATTR(inflight, 0444, part_inflight_show, NULL);
194#ifdef CONFIG_FAIL_MAKE_REQUEST
195static struct device_attribute dev_attr_fail =
196 __ATTR(make-it-fail, 0644, part_fail_show, part_fail_store);
197#endif
198
199static struct attribute *part_attrs[] = {
200 &dev_attr_partition.attr,
201 &dev_attr_start.attr,
202 &dev_attr_size.attr,
203 &dev_attr_ro.attr,
204 &dev_attr_alignment_offset.attr,
205 &dev_attr_discard_alignment.attr,
206 &dev_attr_stat.attr,
207 &dev_attr_inflight.attr,
208#ifdef CONFIG_FAIL_MAKE_REQUEST
209 &dev_attr_fail.attr,
210#endif
211 NULL
212};
213
214static struct attribute_group part_attr_group = {
215 .attrs = part_attrs,
216};
217
218static const struct attribute_group *part_attr_groups[] = {
219 &part_attr_group,
220#ifdef CONFIG_BLK_DEV_IO_TRACE
221 &blk_trace_attr_group,
222#endif
223 NULL
224};
225
226static void part_release(struct device *dev)
227{
228 struct hd_struct *p = dev_to_part(dev);
229 blk_free_devt(dev->devt);
230 hd_free_part(p);
231 kfree(p);
232}
233
234static int part_uevent(struct device *dev, struct kobj_uevent_env *env)
235{
236 struct hd_struct *part = dev_to_part(dev);
237
238 add_uevent_var(env, "PARTN=%u", part->partno);
239 if (part->info && part->info->volname[0])
240 add_uevent_var(env, "PARTNAME=%s", part->info->volname);
241 return 0;
242}
243
244struct device_type part_type = {
245 .name = "partition",
246 .groups = part_attr_groups,
247 .release = part_release,
248 .uevent = part_uevent,
249};
250
251static void delete_partition_work_fn(struct work_struct *work)
252{
253 struct hd_struct *part = container_of(to_rcu_work(work), struct hd_struct,
254 rcu_work);
255
256 part->start_sect = 0;
257 part->nr_sects = 0;
258 part_stat_set_all(part, 0);
259 put_device(part_to_dev(part));
260}
261
262void __delete_partition(struct percpu_ref *ref)
263{
264 struct hd_struct *part = container_of(ref, struct hd_struct, ref);
265 INIT_RCU_WORK(&part->rcu_work, delete_partition_work_fn);
266 queue_rcu_work(system_wq, &part->rcu_work);
267}
268
269
270
271
272
273void delete_partition(struct gendisk *disk, int partno)
274{
275 struct disk_part_tbl *ptbl =
276 rcu_dereference_protected(disk->part_tbl, 1);
277 struct hd_struct *part;
278
279 if (partno >= ptbl->len)
280 return;
281
282 part = rcu_dereference_protected(ptbl->part[partno], 1);
283 if (!part)
284 return;
285
286 rcu_assign_pointer(ptbl->part[partno], NULL);
287 rcu_assign_pointer(ptbl->last_lookup, NULL);
288 kobject_put(part->holder_dir);
289 device_del(part_to_dev(part));
290
291
292
293
294
295
296
297 blk_invalidate_devt(part_devt(part));
298 hd_struct_kill(part);
299}
300
301static ssize_t whole_disk_show(struct device *dev,
302 struct device_attribute *attr, char *buf)
303{
304 return 0;
305}
306static DEVICE_ATTR(whole_disk, 0444, whole_disk_show, NULL);
307
308
309
310
311
312struct hd_struct *add_partition(struct gendisk *disk, int partno,
313 sector_t start, sector_t len, int flags,
314 struct partition_meta_info *info)
315{
316 struct hd_struct *p;
317 dev_t devt = MKDEV(0, 0);
318 struct device *ddev = disk_to_dev(disk);
319 struct device *pdev;
320 struct disk_part_tbl *ptbl;
321 const char *dname;
322 int err;
323
324
325
326
327
328 switch (disk->queue->limits.zoned) {
329 case BLK_ZONED_HM:
330 pr_warn("%s: partitions not supported on host managed zoned block device\n",
331 disk->disk_name);
332 return ERR_PTR(-ENXIO);
333 case BLK_ZONED_HA:
334 pr_info("%s: disabling host aware zoned block device support due to partitions\n",
335 disk->disk_name);
336 disk->queue->limits.zoned = BLK_ZONED_NONE;
337 break;
338 case BLK_ZONED_NONE:
339 break;
340 }
341
342 err = disk_expand_part_tbl(disk, partno);
343 if (err)
344 return ERR_PTR(err);
345 ptbl = rcu_dereference_protected(disk->part_tbl, 1);
346
347 if (ptbl->part[partno])
348 return ERR_PTR(-EBUSY);
349
350 p = kzalloc(sizeof(*p), GFP_KERNEL);
351 if (!p)
352 return ERR_PTR(-EBUSY);
353
354 if (!init_part_stats(p)) {
355 err = -ENOMEM;
356 goto out_free;
357 }
358
359 seqcount_init(&p->nr_sects_seq);
360 pdev = part_to_dev(p);
361
362 p->start_sect = start;
363 p->alignment_offset =
364 queue_limit_alignment_offset(&disk->queue->limits, start);
365 p->discard_alignment =
366 queue_limit_discard_alignment(&disk->queue->limits, start);
367 p->nr_sects = len;
368 p->partno = partno;
369 p->policy = get_disk_ro(disk);
370
371 if (info) {
372 struct partition_meta_info *pinfo = alloc_part_info(disk);
373 if (!pinfo) {
374 err = -ENOMEM;
375 goto out_free_stats;
376 }
377 memcpy(pinfo, info, sizeof(*info));
378 p->info = pinfo;
379 }
380
381 dname = dev_name(ddev);
382 if (isdigit(dname[strlen(dname) - 1]))
383 dev_set_name(pdev, "%sp%d", dname, partno);
384 else
385 dev_set_name(pdev, "%s%d", dname, partno);
386
387 device_initialize(pdev);
388 pdev->class = &block_class;
389 pdev->type = &part_type;
390 pdev->parent = ddev;
391
392 err = blk_alloc_devt(p, &devt);
393 if (err)
394 goto out_free_info;
395 pdev->devt = devt;
396
397
398 dev_set_uevent_suppress(pdev, 1);
399 err = device_add(pdev);
400 if (err)
401 goto out_put;
402
403 err = -ENOMEM;
404 p->holder_dir = kobject_create_and_add("holders", &pdev->kobj);
405 if (!p->holder_dir)
406 goto out_del;
407
408 dev_set_uevent_suppress(pdev, 0);
409 if (flags & ADDPART_FLAG_WHOLEDISK) {
410 err = device_create_file(pdev, &dev_attr_whole_disk);
411 if (err)
412 goto out_del;
413 }
414
415 err = hd_ref_init(p);
416 if (err) {
417 if (flags & ADDPART_FLAG_WHOLEDISK)
418 goto out_remove_file;
419 goto out_del;
420 }
421
422
423 rcu_assign_pointer(ptbl->part[partno], p);
424
425
426 if (!dev_get_uevent_suppress(ddev))
427 kobject_uevent(&pdev->kobj, KOBJ_ADD);
428 return p;
429
430out_free_info:
431 free_part_info(p);
432out_free_stats:
433 free_part_stats(p);
434out_free:
435 kfree(p);
436 return ERR_PTR(err);
437out_remove_file:
438 device_remove_file(pdev, &dev_attr_whole_disk);
439out_del:
440 kobject_put(p->holder_dir);
441 device_del(pdev);
442out_put:
443 put_device(pdev);
444 return ERR_PTR(err);
445}
446
447static bool disk_unlock_native_capacity(struct gendisk *disk)
448{
449 const struct block_device_operations *bdops = disk->fops;
450
451 if (bdops->unlock_native_capacity &&
452 !(disk->flags & GENHD_FL_NATIVE_CAPACITY)) {
453 printk(KERN_CONT "enabling native capacity\n");
454 bdops->unlock_native_capacity(disk);
455 disk->flags |= GENHD_FL_NATIVE_CAPACITY;
456 return true;
457 } else {
458 printk(KERN_CONT "truncated\n");
459 return false;
460 }
461}
462
463int blk_drop_partitions(struct gendisk *disk, struct block_device *bdev)
464{
465 struct disk_part_iter piter;
466 struct hd_struct *part;
467 int res;
468
469 if (!disk_part_scan_enabled(disk))
470 return 0;
471 if (bdev->bd_part_count || bdev->bd_super)
472 return -EBUSY;
473 res = invalidate_partition(disk, 0);
474 if (res)
475 return res;
476
477 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
478 while ((part = disk_part_iter_next(&piter)))
479 delete_partition(disk, part->partno);
480 disk_part_iter_exit(&piter);
481
482 return 0;
483}
484
485static bool blk_add_partition(struct gendisk *disk, struct block_device *bdev,
486 struct parsed_partitions *state, int p)
487{
488 sector_t size = state->parts[p].size;
489 sector_t from = state->parts[p].from;
490 struct hd_struct *part;
491
492 if (!size)
493 return true;
494
495 if (from >= get_capacity(disk)) {
496 printk(KERN_WARNING
497 "%s: p%d start %llu is beyond EOD, ",
498 disk->disk_name, p, (unsigned long long) from);
499 if (disk_unlock_native_capacity(disk))
500 return false;
501 return true;
502 }
503
504 if (from + size > get_capacity(disk)) {
505 printk(KERN_WARNING
506 "%s: p%d size %llu extends beyond EOD, ",
507 disk->disk_name, p, (unsigned long long) size);
508
509 if (disk_unlock_native_capacity(disk))
510 return false;
511
512
513
514
515
516
517 size = get_capacity(disk) - from;
518 }
519
520 part = add_partition(disk, p, from, size, state->parts[p].flags,
521 &state->parts[p].info);
522 if (IS_ERR(part) && PTR_ERR(part) != -ENXIO) {
523 printk(KERN_ERR " %s: p%d could not be added: %ld\n",
524 disk->disk_name, p, -PTR_ERR(part));
525 return true;
526 }
527
528#ifdef CONFIG_BLK_DEV_MD
529 if (state->parts[p].flags & ADDPART_FLAG_RAID)
530 md_autodetect_dev(part_to_dev(part)->devt);
531#endif
532 return true;
533}
534
535int blk_add_partitions(struct gendisk *disk, struct block_device *bdev)
536{
537 struct parsed_partitions *state;
538 int ret = -EAGAIN, p, highest;
539
540 if (!disk_part_scan_enabled(disk))
541 return 0;
542
543 state = check_partition(disk, bdev);
544 if (!state)
545 return 0;
546 if (IS_ERR(state)) {
547
548
549
550
551 if (PTR_ERR(state) == -ENOSPC) {
552 printk(KERN_WARNING "%s: partition table beyond EOD, ",
553 disk->disk_name);
554 if (disk_unlock_native_capacity(disk))
555 return -EAGAIN;
556 }
557 return -EIO;
558 }
559
560
561
562
563 if (disk->queue->limits.zoned == BLK_ZONED_HM) {
564 pr_warn("%s: ignoring partition table on host managed zoned block device\n",
565 disk->disk_name);
566 ret = 0;
567 goto out_free_state;
568 }
569
570
571
572
573
574
575 if (state->access_beyond_eod) {
576 printk(KERN_WARNING
577 "%s: partition table partially beyond EOD, ",
578 disk->disk_name);
579 if (disk_unlock_native_capacity(disk))
580 goto out_free_state;
581 }
582
583
584 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
585
586
587
588
589
590 for (p = 1, highest = 0; p < state->limit; p++)
591 if (state->parts[p].size)
592 highest = p;
593 disk_expand_part_tbl(disk, highest);
594
595 for (p = 1; p < state->limit; p++)
596 if (!blk_add_partition(disk, bdev, state, p))
597 goto out_free_state;
598
599 ret = 0;
600out_free_state:
601 free_partitions(state);
602 return ret;
603}
604
605unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
606{
607 struct address_space *mapping = bdev->bd_inode->i_mapping;
608 struct page *page;
609
610 page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_SHIFT-9)), NULL);
611 if (!IS_ERR(page)) {
612 if (PageError(page))
613 goto fail;
614 p->v = page;
615 return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_SHIFT - 9)) - 1)) << 9);
616fail:
617 put_page(page);
618 }
619 p->v = NULL;
620 return NULL;
621}
622
623EXPORT_SYMBOL(read_dev_sector);
624