blob: 91622db9aedffd997947642a5872802312346869 [file] [log] [blame]
Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001// SPDX-License-Identifier: GPL-2.0
Al Viro94ea4152011-09-16 00:45:36 -04002/*
3 * Code extracted from drivers/block/genhd.c
4 * Copyright (C) 1991-1998 Linus Torvalds
5 * Re-organised Feb 1998 Russell King
6 *
7 * We now have independent partition support from the
8 * block drivers, which allows all the partition code to
9 * be grouped in one location, and it to be mostly self
10 * contained.
11 */
12
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 * disk_name() is used by partition check code and the genhd driver.
30 * It formats the devicename of the indicated disk into
31 * the supplied buffer (of size at least 32), and returns
32 * a pointer to that same buffer (for convenience).
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
54/*
55 * There's very little reason to use this, you should really
56 * have a struct block_device just about everywhere and use
57 * bdevname() instead.
58 */
59const char *__bdevname(dev_t dev, char *buffer)
60{
61 scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",
62 MAJOR(dev), MINOR(dev));
63 return buffer;
64}
65
66EXPORT_SYMBOL(__bdevname);
67
68static ssize_t part_partition_show(struct device *dev,
69 struct device_attribute *attr, char *buf)
70{
71 struct hd_struct *p = dev_to_part(dev);
72
73 return sprintf(buf, "%d\n", p->partno);
74}
75
76static ssize_t part_start_show(struct device *dev,
77 struct device_attribute *attr, char *buf)
78{
79 struct hd_struct *p = dev_to_part(dev);
80
81 return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect);
82}
83
84ssize_t part_size_show(struct device *dev,
85 struct device_attribute *attr, char *buf)
86{
87 struct hd_struct *p = dev_to_part(dev);
Vivek Goyalc83f6bf2012-08-01 12:24:18 +020088 return sprintf(buf, "%llu\n",(unsigned long long)part_nr_sects_read(p));
Al Viro94ea4152011-09-16 00:45:36 -040089}
90
91static ssize_t part_ro_show(struct device *dev,
92 struct device_attribute *attr, char *buf)
93{
94 struct hd_struct *p = dev_to_part(dev);
95 return sprintf(buf, "%d\n", p->policy ? 1 : 0);
96}
97
98static ssize_t part_alignment_offset_show(struct device *dev,
99 struct device_attribute *attr, char *buf)
100{
101 struct hd_struct *p = dev_to_part(dev);
102 return sprintf(buf, "%llu\n", (unsigned long long)p->alignment_offset);
103}
104
105static ssize_t part_discard_alignment_show(struct device *dev,
106 struct device_attribute *attr, char *buf)
107{
108 struct hd_struct *p = dev_to_part(dev);
109 return sprintf(buf, "%u\n", p->discard_alignment);
110}
111
112ssize_t part_stat_show(struct device *dev,
113 struct device_attribute *attr, char *buf)
114{
115 struct hd_struct *p = dev_to_part(dev);
Shaohua Lif5c156c2017-09-21 12:17:16 -0700116 struct request_queue *q = part_to_disk(p)->queue;
Jens Axboe0609e0e2017-08-08 17:49:47 -0600117 unsigned int inflight[2];
Al Viro94ea4152011-09-16 00:45:36 -0400118 int cpu;
119
120 cpu = part_stat_lock();
Jens Axboed62e26b2017-06-30 21:55:08 -0600121 part_round_stats(q, cpu, p);
Al Viro94ea4152011-09-16 00:45:36 -0400122 part_stat_unlock();
Jens Axboe0609e0e2017-08-08 17:49:47 -0600123 part_in_flight(q, p, inflight);
Al Viro94ea4152011-09-16 00:45:36 -0400124 return sprintf(buf,
125 "%8lu %8lu %8llu %8u "
126 "%8lu %8lu %8llu %8u "
127 "%8u %8u %8u"
128 "\n",
129 part_stat_read(p, ios[READ]),
130 part_stat_read(p, merges[READ]),
131 (unsigned long long)part_stat_read(p, sectors[READ]),
132 jiffies_to_msecs(part_stat_read(p, ticks[READ])),
133 part_stat_read(p, ios[WRITE]),
134 part_stat_read(p, merges[WRITE]),
135 (unsigned long long)part_stat_read(p, sectors[WRITE]),
136 jiffies_to_msecs(part_stat_read(p, ticks[WRITE])),
Jens Axboe0609e0e2017-08-08 17:49:47 -0600137 inflight[0],
Al Viro94ea4152011-09-16 00:45:36 -0400138 jiffies_to_msecs(part_stat_read(p, io_ticks)),
139 jiffies_to_msecs(part_stat_read(p, time_in_queue)));
140}
141
142ssize_t part_inflight_show(struct device *dev,
143 struct device_attribute *attr, char *buf)
144{
145 struct hd_struct *p = dev_to_part(dev);
146
147 return sprintf(buf, "%8u %8u\n", atomic_read(&p->in_flight[0]),
148 atomic_read(&p->in_flight[1]));
149}
150
151#ifdef CONFIG_FAIL_MAKE_REQUEST
152ssize_t part_fail_show(struct device *dev,
153 struct device_attribute *attr, char *buf)
154{
155 struct hd_struct *p = dev_to_part(dev);
156
157 return sprintf(buf, "%d\n", p->make_it_fail);
158}
159
160ssize_t part_fail_store(struct device *dev,
161 struct device_attribute *attr,
162 const char *buf, size_t count)
163{
164 struct hd_struct *p = dev_to_part(dev);
165 int i;
166
167 if (count > 0 && sscanf(buf, "%d", &i) > 0)
168 p->make_it_fail = (i == 0) ? 0 : 1;
169
170 return count;
171}
172#endif
173
174static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL);
175static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL);
176static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
177static DEVICE_ATTR(ro, S_IRUGO, part_ro_show, NULL);
178static DEVICE_ATTR(alignment_offset, S_IRUGO, part_alignment_offset_show, NULL);
179static DEVICE_ATTR(discard_alignment, S_IRUGO, part_discard_alignment_show,
180 NULL);
181static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
182static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL);
183#ifdef CONFIG_FAIL_MAKE_REQUEST
184static struct device_attribute dev_attr_fail =
185 __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store);
186#endif
187
188static struct attribute *part_attrs[] = {
189 &dev_attr_partition.attr,
190 &dev_attr_start.attr,
191 &dev_attr_size.attr,
192 &dev_attr_ro.attr,
193 &dev_attr_alignment_offset.attr,
194 &dev_attr_discard_alignment.attr,
195 &dev_attr_stat.attr,
196 &dev_attr_inflight.attr,
197#ifdef CONFIG_FAIL_MAKE_REQUEST
198 &dev_attr_fail.attr,
199#endif
200 NULL
201};
202
203static struct attribute_group part_attr_group = {
204 .attrs = part_attrs,
205};
206
207static const struct attribute_group *part_attr_groups[] = {
208 &part_attr_group,
209#ifdef CONFIG_BLK_DEV_IO_TRACE
210 &blk_trace_attr_group,
211#endif
212 NULL
213};
214
215static void part_release(struct device *dev)
216{
217 struct hd_struct *p = dev_to_part(dev);
Keith Busch2da78092014-08-26 09:05:36 -0600218 blk_free_devt(dev->devt);
Ming Leib54e5ed2015-07-16 11:16:44 +0800219 hd_free_part(p);
Al Viro94ea4152011-09-16 00:45:36 -0400220 kfree(p);
221}
222
San Mehat0d9c51a62016-03-15 14:53:26 -0700223static int part_uevent(struct device *dev, struct kobj_uevent_env *env)
224{
225 struct hd_struct *part = dev_to_part(dev);
226
227 add_uevent_var(env, "PARTN=%u", part->partno);
228 if (part->info && part->info->volname[0])
229 add_uevent_var(env, "PARTNAME=%s", part->info->volname);
230 return 0;
231}
232
Al Viro94ea4152011-09-16 00:45:36 -0400233struct device_type part_type = {
234 .name = "partition",
235 .groups = part_attr_groups,
236 .release = part_release,
San Mehat0d9c51a62016-03-15 14:53:26 -0700237 .uevent = part_uevent,
Al Viro94ea4152011-09-16 00:45:36 -0400238};
239
240static void delete_partition_rcu_cb(struct rcu_head *head)
241{
242 struct hd_struct *part = container_of(head, struct hd_struct, rcu_head);
243
244 part->start_sect = 0;
245 part->nr_sects = 0;
246 part_stat_set_all(part, 0);
247 put_device(part_to_dev(part));
248}
249
Ming Lei6c710132015-07-16 11:16:45 +0800250void __delete_partition(struct percpu_ref *ref)
Al Viro94ea4152011-09-16 00:45:36 -0400251{
Ming Lei6c710132015-07-16 11:16:45 +0800252 struct hd_struct *part = container_of(ref, struct hd_struct, ref);
Al Viro94ea4152011-09-16 00:45:36 -0400253 call_rcu(&part->rcu_head, delete_partition_rcu_cb);
254}
255
Bart Van Assche6d2cf6f2017-08-17 16:23:06 -0700256/*
257 * Must be called either with bd_mutex held, before a disk can be opened or
258 * after all disk users are gone.
259 */
Al Viro94ea4152011-09-16 00:45:36 -0400260void delete_partition(struct gendisk *disk, int partno)
261{
Bart Van Assche6d2cf6f2017-08-17 16:23:06 -0700262 struct disk_part_tbl *ptbl =
263 rcu_dereference_protected(disk->part_tbl, 1);
Al Viro94ea4152011-09-16 00:45:36 -0400264 struct hd_struct *part;
265
266 if (partno >= ptbl->len)
267 return;
268
Bart Van Assche6d2cf6f2017-08-17 16:23:06 -0700269 part = rcu_dereference_protected(ptbl->part[partno], 1);
Al Viro94ea4152011-09-16 00:45:36 -0400270 if (!part)
271 return;
272
Al Viro94ea4152011-09-16 00:45:36 -0400273 rcu_assign_pointer(ptbl->part[partno], NULL);
274 rcu_assign_pointer(ptbl->last_lookup, NULL);
275 kobject_put(part->holder_dir);
276 device_del(part_to_dev(part));
277
Ming Lei6c710132015-07-16 11:16:45 +0800278 hd_struct_kill(part);
Al Viro94ea4152011-09-16 00:45:36 -0400279}
280
281static ssize_t whole_disk_show(struct device *dev,
282 struct device_attribute *attr, char *buf)
283{
284 return 0;
285}
286static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH,
287 whole_disk_show, NULL);
288
Bart Van Assche6d2cf6f2017-08-17 16:23:06 -0700289/*
290 * Must be called either with bd_mutex held, before a disk can be opened or
291 * after all disk users are gone.
292 */
Al Viro94ea4152011-09-16 00:45:36 -0400293struct hd_struct *add_partition(struct gendisk *disk, int partno,
294 sector_t start, sector_t len, int flags,
295 struct partition_meta_info *info)
296{
297 struct hd_struct *p;
298 dev_t devt = MKDEV(0, 0);
299 struct device *ddev = disk_to_dev(disk);
300 struct device *pdev;
301 struct disk_part_tbl *ptbl;
302 const char *dname;
303 int err;
304
305 err = disk_expand_part_tbl(disk, partno);
306 if (err)
307 return ERR_PTR(err);
Bart Van Assche6d2cf6f2017-08-17 16:23:06 -0700308 ptbl = rcu_dereference_protected(disk->part_tbl, 1);
Al Viro94ea4152011-09-16 00:45:36 -0400309
310 if (ptbl->part[partno])
311 return ERR_PTR(-EBUSY);
312
313 p = kzalloc(sizeof(*p), GFP_KERNEL);
314 if (!p)
315 return ERR_PTR(-EBUSY);
316
317 if (!init_part_stats(p)) {
318 err = -ENOMEM;
319 goto out_free;
320 }
Vivek Goyalc83f6bf2012-08-01 12:24:18 +0200321
322 seqcount_init(&p->nr_sects_seq);
Al Viro94ea4152011-09-16 00:45:36 -0400323 pdev = part_to_dev(p);
324
325 p->start_sect = start;
326 p->alignment_offset =
327 queue_limit_alignment_offset(&disk->queue->limits, start);
328 p->discard_alignment =
329 queue_limit_discard_alignment(&disk->queue->limits, start);
330 p->nr_sects = len;
331 p->partno = partno;
332 p->policy = get_disk_ro(disk);
333
334 if (info) {
335 struct partition_meta_info *pinfo = alloc_part_info(disk);
Dan Carpenter7bd897c2017-05-23 17:28:36 +0300336 if (!pinfo) {
337 err = -ENOMEM;
Al Viro94ea4152011-09-16 00:45:36 -0400338 goto out_free_stats;
Dan Carpenter7bd897c2017-05-23 17:28:36 +0300339 }
Al Viro94ea4152011-09-16 00:45:36 -0400340 memcpy(pinfo, info, sizeof(*info));
341 p->info = pinfo;
342 }
343
344 dname = dev_name(ddev);
345 if (isdigit(dname[strlen(dname) - 1]))
346 dev_set_name(pdev, "%sp%d", dname, partno);
347 else
348 dev_set_name(pdev, "%s%d", dname, partno);
349
350 device_initialize(pdev);
351 pdev->class = &block_class;
352 pdev->type = &part_type;
353 pdev->parent = ddev;
354
355 err = blk_alloc_devt(p, &devt);
356 if (err)
357 goto out_free_info;
358 pdev->devt = devt;
359
360 /* delay uevent until 'holders' subdir is created */
361 dev_set_uevent_suppress(pdev, 1);
362 err = device_add(pdev);
363 if (err)
364 goto out_put;
365
366 err = -ENOMEM;
367 p->holder_dir = kobject_create_and_add("holders", &pdev->kobj);
368 if (!p->holder_dir)
369 goto out_del;
370
371 dev_set_uevent_suppress(pdev, 0);
372 if (flags & ADDPART_FLAG_WHOLEDISK) {
373 err = device_create_file(pdev, &dev_attr_whole_disk);
374 if (err)
375 goto out_del;
376 }
377
Ming Leib30a337ca2016-03-30 08:46:31 +0800378 err = hd_ref_init(p);
379 if (err) {
380 if (flags & ADDPART_FLAG_WHOLEDISK)
381 goto out_remove_file;
382 goto out_del;
383 }
384
Al Viro94ea4152011-09-16 00:45:36 -0400385 /* everything is up and running, commence */
386 rcu_assign_pointer(ptbl->part[partno], p);
387
388 /* suppress uevent if the disk suppresses it */
389 if (!dev_get_uevent_suppress(ddev))
390 kobject_uevent(&pdev->kobj, KOBJ_ADD);
Ming Leib30a337ca2016-03-30 08:46:31 +0800391 return p;
Al Viro94ea4152011-09-16 00:45:36 -0400392
393out_free_info:
394 free_part_info(p);
395out_free_stats:
396 free_part_stats(p);
397out_free:
398 kfree(p);
399 return ERR_PTR(err);
Ming Leib30a337ca2016-03-30 08:46:31 +0800400out_remove_file:
401 device_remove_file(pdev, &dev_attr_whole_disk);
Al Viro94ea4152011-09-16 00:45:36 -0400402out_del:
403 kobject_put(p->holder_dir);
404 device_del(pdev);
405out_put:
406 put_device(pdev);
Al Viro94ea4152011-09-16 00:45:36 -0400407 return ERR_PTR(err);
408}
409
410static bool disk_unlock_native_capacity(struct gendisk *disk)
411{
412 const struct block_device_operations *bdops = disk->fops;
413
414 if (bdops->unlock_native_capacity &&
415 !(disk->flags & GENHD_FL_NATIVE_CAPACITY)) {
416 printk(KERN_CONT "enabling native capacity\n");
417 bdops->unlock_native_capacity(disk);
418 disk->flags |= GENHD_FL_NATIVE_CAPACITY;
419 return true;
420 } else {
421 printk(KERN_CONT "truncated\n");
422 return false;
423 }
424}
425
Jun'ichi Nomurafe316bf2012-03-02 10:38:33 +0100426static int drop_partitions(struct gendisk *disk, struct block_device *bdev)
Al Viro94ea4152011-09-16 00:45:36 -0400427{
Al Viro94ea4152011-09-16 00:45:36 -0400428 struct disk_part_iter piter;
429 struct hd_struct *part;
Jun'ichi Nomurafe316bf2012-03-02 10:38:33 +0100430 int res;
Al Viro94ea4152011-09-16 00:45:36 -0400431
Eric Sandeen77032ca2015-11-24 17:30:34 -0600432 if (bdev->bd_part_count || bdev->bd_super)
Al Viro94ea4152011-09-16 00:45:36 -0400433 return -EBUSY;
434 res = invalidate_partition(disk, 0);
435 if (res)
436 return res;
437
438 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
439 while ((part = disk_part_iter_next(&piter)))
440 delete_partition(disk, part->partno);
441 disk_part_iter_exit(&piter);
442
Jun'ichi Nomurafe316bf2012-03-02 10:38:33 +0100443 return 0;
444}
445
Damien Le Moalb02d8aa2016-12-01 16:00:25 +0900446static bool part_zone_aligned(struct gendisk *disk,
447 struct block_device *bdev,
448 sector_t from, sector_t size)
449{
Damien Le Moalf99e8642017-01-12 07:58:32 -0700450 unsigned int zone_sectors = bdev_zone_sectors(bdev);
Damien Le Moalb02d8aa2016-12-01 16:00:25 +0900451
452 /*
453 * If this function is called, then the disk is a zoned block device
454 * (host-aware or host-managed). This can be detected even if the
455 * zoned block device support is disabled (CONFIG_BLK_DEV_ZONED not
456 * set). In this case, however, only host-aware devices will be seen
457 * as a block device is not created for host-managed devices. Without
458 * zoned block device support, host-aware drives can still be used as
459 * regular block devices (no zone operation) and their zone size will
460 * be reported as 0. Allow this case.
461 */
Damien Le Moalf99e8642017-01-12 07:58:32 -0700462 if (!zone_sectors)
Damien Le Moalb02d8aa2016-12-01 16:00:25 +0900463 return true;
464
465 /*
466 * Check partition start and size alignement. If the drive has a
467 * smaller last runt zone, ignore it and allow the partition to
468 * use it. Check the zone size too: it should be a power of 2 number
469 * of sectors.
470 */
Damien Le Moalf99e8642017-01-12 07:58:32 -0700471 if (WARN_ON_ONCE(!is_power_of_2(zone_sectors))) {
Damien Le Moalb02d8aa2016-12-01 16:00:25 +0900472 u32 rem;
473
Damien Le Moalf99e8642017-01-12 07:58:32 -0700474 div_u64_rem(from, zone_sectors, &rem);
Damien Le Moalb02d8aa2016-12-01 16:00:25 +0900475 if (rem)
476 return false;
477 if ((from + size) < get_capacity(disk)) {
Damien Le Moalf99e8642017-01-12 07:58:32 -0700478 div_u64_rem(size, zone_sectors, &rem);
Damien Le Moalb02d8aa2016-12-01 16:00:25 +0900479 if (rem)
480 return false;
481 }
482
483 } else {
484
Damien Le Moalf99e8642017-01-12 07:58:32 -0700485 if (from & (zone_sectors - 1))
Damien Le Moalb02d8aa2016-12-01 16:00:25 +0900486 return false;
487 if ((from + size) < get_capacity(disk) &&
Damien Le Moalf99e8642017-01-12 07:58:32 -0700488 (size & (zone_sectors - 1)))
Damien Le Moalb02d8aa2016-12-01 16:00:25 +0900489 return false;
490
491 }
492
493 return true;
494}
495
Jun'ichi Nomurafe316bf2012-03-02 10:38:33 +0100496int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
497{
498 struct parsed_partitions *state = NULL;
499 struct hd_struct *part;
500 int p, highest, res;
501rescan:
502 if (state && !IS_ERR(state)) {
Ming Leiac2e5322013-02-27 17:05:19 -0800503 free_partitions(state);
Jun'ichi Nomurafe316bf2012-03-02 10:38:33 +0100504 state = NULL;
505 }
506
507 res = drop_partitions(disk, bdev);
508 if (res)
509 return res;
510
Al Viro94ea4152011-09-16 00:45:36 -0400511 if (disk->fops->revalidate_disk)
512 disk->fops->revalidate_disk(disk);
513 check_disk_size_change(disk, bdev);
514 bdev->bd_invalidated = 0;
515 if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
516 return 0;
517 if (IS_ERR(state)) {
518 /*
519 * I/O error reading the partition table. If any
520 * partition code tried to read beyond EOD, retry
521 * after unlocking native capacity.
522 */
523 if (PTR_ERR(state) == -ENOSPC) {
524 printk(KERN_WARNING "%s: partition table beyond EOD, ",
525 disk->disk_name);
526 if (disk_unlock_native_capacity(disk))
527 goto rescan;
528 }
529 return -EIO;
530 }
531 /*
532 * If any partition code tried to read beyond EOD, try
533 * unlocking native capacity even if partition table is
534 * successfully read as we could be missing some partitions.
535 */
536 if (state->access_beyond_eod) {
537 printk(KERN_WARNING
538 "%s: partition table partially beyond EOD, ",
539 disk->disk_name);
540 if (disk_unlock_native_capacity(disk))
541 goto rescan;
542 }
543
544 /* tell userspace that the media / partition table may have changed */
545 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
546
547 /* Detect the highest partition number and preallocate
548 * disk->part_tbl. This is an optimization and not strictly
549 * necessary.
550 */
551 for (p = 1, highest = 0; p < state->limit; p++)
552 if (state->parts[p].size)
553 highest = p;
554
555 disk_expand_part_tbl(disk, highest);
556
557 /* add partitions */
558 for (p = 1; p < state->limit; p++) {
559 sector_t size, from;
Al Viro94ea4152011-09-16 00:45:36 -0400560
561 size = state->parts[p].size;
562 if (!size)
563 continue;
564
565 from = state->parts[p].from;
566 if (from >= get_capacity(disk)) {
567 printk(KERN_WARNING
568 "%s: p%d start %llu is beyond EOD, ",
569 disk->disk_name, p, (unsigned long long) from);
570 if (disk_unlock_native_capacity(disk))
571 goto rescan;
572 continue;
573 }
574
575 if (from + size > get_capacity(disk)) {
576 printk(KERN_WARNING
577 "%s: p%d size %llu extends beyond EOD, ",
578 disk->disk_name, p, (unsigned long long) size);
579
580 if (disk_unlock_native_capacity(disk)) {
581 /* free state and restart */
582 goto rescan;
583 } else {
584 /*
585 * we can not ignore partitions of broken tables
586 * created by for example camera firmware, but
587 * we limit them to the end of the disk to avoid
588 * creating invalid block devices
589 */
590 size = get_capacity(disk) - from;
591 }
592 }
593
Damien Le Moalb02d8aa2016-12-01 16:00:25 +0900594 /*
595 * On a zoned block device, partitions should be aligned on the
596 * device zone size (i.e. zone boundary crossing not allowed).
597 * Otherwise, resetting the write pointer of the last zone of
598 * one partition may impact the following partition.
599 */
600 if (bdev_is_zoned(bdev) &&
601 !part_zone_aligned(disk, bdev, from, size)) {
602 printk(KERN_WARNING
603 "%s: p%d start %llu+%llu is not zone aligned\n",
604 disk->disk_name, p, (unsigned long long) from,
605 (unsigned long long) size);
606 continue;
607 }
608
Al Viro94ea4152011-09-16 00:45:36 -0400609 part = add_partition(disk, p, from, size,
610 state->parts[p].flags,
611 &state->parts[p].info);
612 if (IS_ERR(part)) {
613 printk(KERN_ERR " %s: p%d could not be added: %ld\n",
614 disk->disk_name, p, -PTR_ERR(part));
615 continue;
616 }
617#ifdef CONFIG_BLK_DEV_MD
618 if (state->parts[p].flags & ADDPART_FLAG_RAID)
619 md_autodetect_dev(part_to_dev(part)->devt);
620#endif
621 }
Ming Leiac2e5322013-02-27 17:05:19 -0800622 free_partitions(state);
Al Viro94ea4152011-09-16 00:45:36 -0400623 return 0;
624}
625
Jun'ichi Nomurafe316bf2012-03-02 10:38:33 +0100626int invalidate_partitions(struct gendisk *disk, struct block_device *bdev)
627{
628 int res;
629
630 if (!bdev->bd_invalidated)
631 return 0;
632
633 res = drop_partitions(disk, bdev);
634 if (res)
635 return res;
636
637 set_capacity(disk, 0);
638 check_disk_size_change(disk, bdev);
639 bdev->bd_invalidated = 0;
640 /* tell userspace that the media / partition table may have changed */
641 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
642
643 return 0;
644}
645
Dan Williamsd1a5f2b42016-01-28 20:25:31 -0800646unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
647{
Dan Williamsa41fe02b2017-01-27 14:13:15 -0800648 struct address_space *mapping = bdev->bd_inode->i_mapping;
Al Viro94ea4152011-09-16 00:45:36 -0400649 struct page *page;
650
Dan Williamsa41fe02b2017-01-27 14:13:15 -0800651 page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_SHIFT-9)), NULL);
Al Viro94ea4152011-09-16 00:45:36 -0400652 if (!IS_ERR(page)) {
653 if (PageError(page))
654 goto fail;
655 p->v = page;
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300656 return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_SHIFT - 9)) - 1)) << 9);
Al Viro94ea4152011-09-16 00:45:36 -0400657fail:
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300658 put_page(page);
Al Viro94ea4152011-09-16 00:45:36 -0400659 }
660 p->v = NULL;
661 return NULL;
662}
663
664EXPORT_SYMBOL(read_dev_sector);