blob: ac546975031f7dd9a0f110f9a4479c6e34cef15c [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * fs/partitions/check.c
3 *
4 * Code extracted from drivers/block/genhd.c
5 * Copyright (C) 1991-1998 Linus Torvalds
6 * Re-organised Feb 1998 Russell King
7 *
8 * We now have independent partition support from the
9 * block drivers, which allows all the partition code to
10 * be grouped in one location, and it to be mostly self
11 * contained.
12 *
13 * Added needed MAJORS for new pairs, {hdi,hdj}, {hdk,hdl}
14 */
15
16#include <linux/init.h>
17#include <linux/module.h>
18#include <linux/fs.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090019#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/kmod.h>
21#include <linux/ctype.h>
Jerome Marchand6f2576a2008-02-08 11:04:35 +010022#include <linux/genhd.h>
Arnaldo Carvalho de Melo157f9c02009-01-26 15:00:56 -020023#include <linux/blktrace_api.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
25#include "check.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
27#include "acorn.h"
28#include "amiga.h"
29#include "atari.h"
30#include "ldm.h"
31#include "mac.h"
32#include "msdos.h"
33#include "osf.h"
34#include "sgi.h"
35#include "sun.h"
36#include "ibm.h"
37#include "ultrix.h"
38#include "efi.h"
Bob Copeland0e6e1db2006-01-16 22:14:20 -080039#include "karma.h"
Philippe De Muyter19d0e8c2007-05-08 00:29:15 -070040#include "sysv68.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
42#ifdef CONFIG_BLK_DEV_MD
43extern void md_autodetect_dev(dev_t dev);
44#endif
45
46int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/
47
Tejun Heo1493bf22010-05-15 20:09:30 +020048static int (*check_part[])(struct parsed_partitions *) = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 /*
50 * Probe partition formats with tables at disk address 0
51 * that also have an ADFS boot block at 0xdc0.
52 */
53#ifdef CONFIG_ACORN_PARTITION_ICS
54 adfspart_check_ICS,
55#endif
56#ifdef CONFIG_ACORN_PARTITION_POWERTEC
57 adfspart_check_POWERTEC,
58#endif
59#ifdef CONFIG_ACORN_PARTITION_EESOX
60 adfspart_check_EESOX,
61#endif
62
63 /*
64 * Now move on to formats that only have partition info at
65 * disk address 0xdc0. Since these may also have stale
66 * PC/BIOS partition tables, they need to come before
67 * the msdos entry.
68 */
69#ifdef CONFIG_ACORN_PARTITION_CUMANA
70 adfspart_check_CUMANA,
71#endif
72#ifdef CONFIG_ACORN_PARTITION_ADFS
73 adfspart_check_ADFS,
74#endif
75
76#ifdef CONFIG_EFI_PARTITION
77 efi_partition, /* this must come before msdos */
78#endif
79#ifdef CONFIG_SGI_PARTITION
80 sgi_partition,
81#endif
82#ifdef CONFIG_LDM_PARTITION
83 ldm_partition, /* this must come before msdos */
84#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070085#ifdef CONFIG_MSDOS_PARTITION
86 msdos_partition,
87#endif
88#ifdef CONFIG_OSF_PARTITION
89 osf_partition,
90#endif
91#ifdef CONFIG_SUN_PARTITION
92 sun_partition,
93#endif
94#ifdef CONFIG_AMIGA_PARTITION
95 amiga_partition,
96#endif
97#ifdef CONFIG_ATARI_PARTITION
98 atari_partition,
99#endif
100#ifdef CONFIG_MAC_PARTITION
101 mac_partition,
102#endif
103#ifdef CONFIG_ULTRIX_PARTITION
104 ultrix_partition,
105#endif
106#ifdef CONFIG_IBM_PARTITION
107 ibm_partition,
108#endif
Bob Copeland0e6e1db2006-01-16 22:14:20 -0800109#ifdef CONFIG_KARMA_PARTITION
110 karma_partition,
111#endif
Philippe De Muyter19d0e8c2007-05-08 00:29:15 -0700112#ifdef CONFIG_SYSV68_PARTITION
113 sysv68_partition,
114#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 NULL
116};
117
118/*
119 * disk_name() is used by partition check code and the genhd driver.
120 * It formats the devicename of the indicated disk into
121 * the supplied buffer (of size at least 32), and returns
122 * a pointer to that same buffer (for convenience).
123 */
124
Tejun Heocf771cb2008-09-03 09:01:09 +0200125char *disk_name(struct gendisk *hd, int partno, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126{
Tejun Heocf771cb2008-09-03 09:01:09 +0200127 if (!partno)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name);
129 else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1]))
Tejun Heocf771cb2008-09-03 09:01:09 +0200130 snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, partno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 else
Tejun Heocf771cb2008-09-03 09:01:09 +0200132 snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, partno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
134 return buf;
135}
136
137const char *bdevname(struct block_device *bdev, char *buf)
138{
Tejun Heo0762b8b2008-08-25 19:56:12 +0900139 return disk_name(bdev->bd_disk, bdev->bd_part->partno, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140}
141
142EXPORT_SYMBOL(bdevname);
143
144/*
145 * There's very little reason to use this, you should really
146 * have a struct block_device just about everywhere and use
147 * bdevname() instead.
148 */
149const char *__bdevname(dev_t dev, char *buffer)
150{
151 scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",
152 MAJOR(dev), MINOR(dev));
153 return buffer;
154}
155
156EXPORT_SYMBOL(__bdevname);
157
158static struct parsed_partitions *
159check_partition(struct gendisk *hd, struct block_device *bdev)
160{
161 struct parsed_partitions *state;
Suzuki K P57881dd2006-12-06 20:35:16 -0800162 int i, res, err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163
Tejun Heob403a982010-05-15 20:09:31 +0200164 state = kzalloc(sizeof(struct parsed_partitions), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 if (!state)
166 return NULL;
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700167 state->pp_buf = (char *)__get_free_page(GFP_KERNEL);
168 if (!state->pp_buf) {
169 kfree(state);
170 return NULL;
171 }
172 state->pp_buf[0] = '\0';
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
Tejun Heo1493bf22010-05-15 20:09:30 +0200174 state->bdev = bdev;
Greg Kroah-Hartmana2964182005-06-20 21:15:16 -0700175 disk_name(hd, 0, state->name);
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700176 snprintf(state->pp_buf, PAGE_SIZE, " %s:", state->name);
Greg Kroah-Hartmana2964182005-06-20 21:15:16 -0700177 if (isdigit(state->name[strlen(state->name)-1]))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 sprintf(state->name, "p");
Greg Kroah-Hartmana2964182005-06-20 21:15:16 -0700179
Tejun Heob5d0b9d2008-09-03 09:06:42 +0200180 state->limit = disk_max_parts(hd);
Suzuki K P57881dd2006-12-06 20:35:16 -0800181 i = res = err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 while (!res && check_part[i]) {
183 memset(&state->parts, 0, sizeof(state->parts));
Tejun Heo1493bf22010-05-15 20:09:30 +0200184 res = check_part[i++](state);
Suzuki K P57881dd2006-12-06 20:35:16 -0800185 if (res < 0) {
186 /* We have hit an I/O error which we don't report now.
187 * But record it, and let the others do their job.
188 */
189 err = res;
190 res = 0;
191 }
192
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 }
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700194 if (res > 0) {
195 printk(KERN_INFO "%s", state->pp_buf);
196
197 free_page((unsigned long)state->pp_buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 return state;
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700199 }
Tejun Heob403a982010-05-15 20:09:31 +0200200 if (state->access_beyond_eod)
201 err = -ENOSPC;
suzuki9bebff62007-03-07 20:41:24 -0800202 if (err)
Suzuki K P57881dd2006-12-06 20:35:16 -0800203 /* The partition is unrecognized. So report I/O errors if there were any */
204 res = err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 if (!res)
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700206 strlcat(state->pp_buf, " unknown partition table\n", PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 else if (warn_no_part)
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700208 strlcat(state->pp_buf, " unable to read partition table\n", PAGE_SIZE);
209
210 printk(KERN_INFO "%s", state->pp_buf);
211
212 free_page((unsigned long)state->pp_buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 kfree(state);
Suzuki Kp5127d002006-12-06 20:35:14 -0800214 return ERR_PTR(res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215}
216
Tejun Heo0fc71e32008-10-13 13:27:59 +0200217static ssize_t part_partition_show(struct device *dev,
218 struct device_attribute *attr, char *buf)
219{
220 struct hd_struct *p = dev_to_part(dev);
221
222 return sprintf(buf, "%d\n", p->partno);
223}
224
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200225static ssize_t part_start_show(struct device *dev,
226 struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227{
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200228 struct hd_struct *p = dev_to_part(dev);
Kay Sieversa7fd6702005-10-01 14:49:43 +0200229
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200230 return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231}
232
Tejun Heoe5610522008-08-25 19:56:09 +0900233ssize_t part_size_show(struct device *dev,
234 struct device_attribute *attr, char *buf)
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200235{
236 struct hd_struct *p = dev_to_part(dev);
237 return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects);
238}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239
Kay Sievers34db1d52010-11-11 09:58:57 +0100240ssize_t part_ro_show(struct device *dev,
241 struct device_attribute *attr, char *buf)
242{
243 struct hd_struct *p = dev_to_part(dev);
244 return sprintf(buf, "%d\n", p->policy ? 1 : 0);
245}
246
Martin K. Petersenc72758f2009-05-22 17:17:53 -0400247ssize_t part_alignment_offset_show(struct device *dev,
248 struct device_attribute *attr, char *buf)
249{
250 struct hd_struct *p = dev_to_part(dev);
251 return sprintf(buf, "%llu\n", (unsigned long long)p->alignment_offset);
252}
253
Martin K. Petersen86b37282009-11-10 11:50:21 +0100254ssize_t part_discard_alignment_show(struct device *dev,
255 struct device_attribute *attr, char *buf)
256{
257 struct hd_struct *p = dev_to_part(dev);
258 return sprintf(buf, "%u\n", p->discard_alignment);
259}
260
Tejun Heo074a7ac2008-08-25 19:56:14 +0900261ssize_t part_stat_show(struct device *dev,
262 struct device_attribute *attr, char *buf)
Kay Sieversa7fd6702005-10-01 14:49:43 +0200263{
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200264 struct hd_struct *p = dev_to_part(dev);
Tejun Heoc9959052008-08-25 19:47:21 +0900265 int cpu;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200266
Tejun Heo074a7ac2008-08-25 19:56:14 +0900267 cpu = part_stat_lock();
Tejun Heoc9959052008-08-25 19:47:21 +0900268 part_round_stats(cpu, p);
Tejun Heo074a7ac2008-08-25 19:56:14 +0900269 part_stat_unlock();
Jerome Marchand34e8bea2008-02-08 11:04:55 +0100270 return sprintf(buf,
271 "%8lu %8lu %8llu %8u "
272 "%8lu %8lu %8llu %8u "
273 "%8u %8u %8u"
274 "\n",
275 part_stat_read(p, ios[READ]),
276 part_stat_read(p, merges[READ]),
277 (unsigned long long)part_stat_read(p, sectors[READ]),
278 jiffies_to_msecs(part_stat_read(p, ticks[READ])),
279 part_stat_read(p, ios[WRITE]),
280 part_stat_read(p, merges[WRITE]),
281 (unsigned long long)part_stat_read(p, sectors[WRITE]),
282 jiffies_to_msecs(part_stat_read(p, ticks[WRITE])),
Nikanth Karthikesan316d3152009-10-06 20:16:55 +0200283 part_in_flight(p),
Jerome Marchand34e8bea2008-02-08 11:04:55 +0100284 jiffies_to_msecs(part_stat_read(p, io_ticks)),
285 jiffies_to_msecs(part_stat_read(p, time_in_queue)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287
Nikanth Karthikesan316d3152009-10-06 20:16:55 +0200288ssize_t part_inflight_show(struct device *dev,
289 struct device_attribute *attr, char *buf)
290{
291 struct hd_struct *p = dev_to_part(dev);
292
Shaohua Li1e9bb882011-03-22 08:35:35 +0100293 return sprintf(buf, "%8u %8u\n", atomic_read(&p->in_flight[0]),
294 atomic_read(&p->in_flight[1]));
Nikanth Karthikesan316d3152009-10-06 20:16:55 +0200295}
296
Akinobu Mitac17bb492006-12-08 02:39:46 -0800297#ifdef CONFIG_FAIL_MAKE_REQUEST
Tejun Heoeddb2e22008-08-25 19:56:13 +0900298ssize_t part_fail_show(struct device *dev,
299 struct device_attribute *attr, char *buf)
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200300{
301 struct hd_struct *p = dev_to_part(dev);
Akinobu Mitac17bb492006-12-08 02:39:46 -0800302
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200303 return sprintf(buf, "%d\n", p->make_it_fail);
304}
305
Tejun Heoeddb2e22008-08-25 19:56:13 +0900306ssize_t part_fail_store(struct device *dev,
307 struct device_attribute *attr,
308 const char *buf, size_t count)
Akinobu Mitac17bb492006-12-08 02:39:46 -0800309{
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200310 struct hd_struct *p = dev_to_part(dev);
Akinobu Mitac17bb492006-12-08 02:39:46 -0800311 int i;
312
313 if (count > 0 && sscanf(buf, "%d", &i) > 0)
314 p->make_it_fail = (i == 0) ? 0 : 1;
315
316 return count;
317}
Akinobu Mitac17bb492006-12-08 02:39:46 -0800318#endif
319
Tejun Heo0fc71e32008-10-13 13:27:59 +0200320static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200321static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL);
322static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
Kay Sievers34db1d52010-11-11 09:58:57 +0100323static DEVICE_ATTR(ro, S_IRUGO, part_ro_show, NULL);
Martin K. Petersenc72758f2009-05-22 17:17:53 -0400324static DEVICE_ATTR(alignment_offset, S_IRUGO, part_alignment_offset_show, NULL);
Martin K. Petersen86b37282009-11-10 11:50:21 +0100325static DEVICE_ATTR(discard_alignment, S_IRUGO, part_discard_alignment_show,
326 NULL);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200327static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
Nikanth Karthikesan316d3152009-10-06 20:16:55 +0200328static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL);
Akinobu Mitac17bb492006-12-08 02:39:46 -0800329#ifdef CONFIG_FAIL_MAKE_REQUEST
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200330static struct device_attribute dev_attr_fail =
331 __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store);
Akinobu Mitac17bb492006-12-08 02:39:46 -0800332#endif
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200333
334static struct attribute *part_attrs[] = {
Tejun Heo0fc71e32008-10-13 13:27:59 +0200335 &dev_attr_partition.attr,
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200336 &dev_attr_start.attr,
337 &dev_attr_size.attr,
Kay Sievers34db1d52010-11-11 09:58:57 +0100338 &dev_attr_ro.attr,
Martin K. Petersenc72758f2009-05-22 17:17:53 -0400339 &dev_attr_alignment_offset.attr,
Martin K. Petersen86b37282009-11-10 11:50:21 +0100340 &dev_attr_discard_alignment.attr,
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200341 &dev_attr_stat.attr,
Nikanth Karthikesan316d3152009-10-06 20:16:55 +0200342 &dev_attr_inflight.attr,
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200343#ifdef CONFIG_FAIL_MAKE_REQUEST
344 &dev_attr_fail.attr,
345#endif
346 NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347};
348
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200349static struct attribute_group part_attr_group = {
350 .attrs = part_attrs,
351};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352
David Brownella4dbd672009-06-24 10:06:31 -0700353static const struct attribute_group *part_attr_groups[] = {
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200354 &part_attr_group,
Arnaldo Carvalho de Meloc71a8962009-01-23 12:06:27 -0200355#ifdef CONFIG_BLK_DEV_IO_TRACE
356 &blk_trace_attr_group,
357#endif
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200358 NULL
359};
360
361static void part_release(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362{
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200363 struct hd_struct *p = dev_to_part(dev);
Jerome Marchand6f2576a2008-02-08 11:04:35 +0100364 free_part_stats(p);
Will Drewry6d1d8052010-08-31 15:47:05 -0500365 free_part_info(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 kfree(p);
367}
368
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200369struct device_type part_type = {
370 .name = "partition",
371 .groups = part_attr_groups,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 .release = part_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373};
374
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200375static void delete_partition_rcu_cb(struct rcu_head *head)
376{
377 struct hd_struct *part = container_of(head, struct hd_struct, rcu_head);
378
379 part->start_sect = 0;
380 part->nr_sects = 0;
381 part_stat_set_all(part, 0);
Tejun Heoed9e1982008-08-25 19:56:05 +0900382 put_device(part_to_dev(part));
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200383}
384
Jens Axboe6c23a962011-01-07 08:43:37 +0100385void __delete_partition(struct hd_struct *part)
Jerome Marchand09e099d2011-01-05 16:57:38 +0100386{
Jerome Marchand09e099d2011-01-05 16:57:38 +0100387 call_rcu(&part->rcu_head, delete_partition_rcu_cb);
388}
389
Tejun Heocf771cb2008-09-03 09:01:09 +0200390void delete_partition(struct gendisk *disk, int partno)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391{
Tejun Heo540eed52008-08-25 19:56:15 +0900392 struct disk_part_tbl *ptbl = disk->part_tbl;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200393 struct hd_struct *part;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200394
Tejun Heo540eed52008-08-25 19:56:15 +0900395 if (partno >= ptbl->len)
396 return;
397
398 part = ptbl->part[partno];
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200399 if (!part)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 return;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200401
Tejun Heobcce3de2008-08-25 19:47:22 +0900402 blk_free_devt(part_devt(part));
Tejun Heo540eed52008-08-25 19:56:15 +0900403 rcu_assign_pointer(ptbl->part[partno], NULL);
Neil Brown54b0d122009-01-07 08:55:39 +0100404 rcu_assign_pointer(ptbl->last_lookup, NULL);
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200405 kobject_put(part->holder_dir);
Tejun Heoed9e1982008-08-25 19:56:05 +0900406 device_del(part_to_dev(part));
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200407
Jens Axboe6c23a962011-01-07 08:43:37 +0100408 hd_struct_put(part);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409}
410
Greg Kroah-Hartmanf4a00a22008-02-06 23:33:39 -0800411static ssize_t whole_disk_show(struct device *dev,
412 struct device_attribute *attr, char *buf)
413{
414 return 0;
415}
416static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH,
417 whole_disk_show, NULL);
418
Tejun Heoba329292008-11-10 15:29:58 +0900419struct hd_struct *add_partition(struct gendisk *disk, int partno,
Will Drewry6d1d8052010-08-31 15:47:05 -0500420 sector_t start, sector_t len, int flags,
421 struct partition_meta_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422{
423 struct hd_struct *p;
Tejun Heobcce3de2008-08-25 19:47:22 +0900424 dev_t devt = MKDEV(0, 0);
Tejun Heoed9e1982008-08-25 19:56:05 +0900425 struct device *ddev = disk_to_dev(disk);
426 struct device *pdev;
Tejun Heo540eed52008-08-25 19:56:15 +0900427 struct disk_part_tbl *ptbl;
Tejun Heoed9e1982008-08-25 19:56:05 +0900428 const char *dname;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200429 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
Tejun Heo540eed52008-08-25 19:56:15 +0900431 err = disk_expand_part_tbl(disk, partno);
432 if (err)
Tejun Heoba329292008-11-10 15:29:58 +0900433 return ERR_PTR(err);
Tejun Heo540eed52008-08-25 19:56:15 +0900434 ptbl = disk->part_tbl;
435
436 if (ptbl->part[partno])
Tejun Heoba329292008-11-10 15:29:58 +0900437 return ERR_PTR(-EBUSY);
Tejun Heo88e34122008-08-25 19:30:16 +0900438
Yoann Padioleaudd00cc42007-07-19 01:49:03 -0700439 p = kzalloc(sizeof(*p), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 if (!p)
Tejun Heoba329292008-11-10 15:29:58 +0900441 return ERR_PTR(-EBUSY);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200442
Jerome Marchand6f2576a2008-02-08 11:04:35 +0100443 if (!init_part_stats(p)) {
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700444 err = -ENOMEM;
Tejun Heo88e34122008-08-25 19:30:16 +0900445 goto out_free;
Jerome Marchand6f2576a2008-02-08 11:04:35 +0100446 }
Tejun Heoed9e1982008-08-25 19:56:05 +0900447 pdev = part_to_dev(p);
448
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 p->start_sect = start;
Martin K. Petersene03a72e2010-01-11 03:21:51 -0500450 p->alignment_offset =
451 queue_limit_alignment_offset(&disk->queue->limits, start);
452 p->discard_alignment =
453 queue_limit_discard_alignment(&disk->queue->limits, start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 p->nr_sects = len;
Tejun Heocf771cb2008-09-03 09:01:09 +0200455 p->partno = partno;
Tejun Heob7db9952008-08-25 19:56:10 +0900456 p->policy = get_disk_ro(disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457
Will Drewry6d1d8052010-08-31 15:47:05 -0500458 if (info) {
459 struct partition_meta_info *pinfo = alloc_part_info(disk);
460 if (!pinfo)
461 goto out_free_stats;
462 memcpy(pinfo, info, sizeof(*info));
463 p->info = pinfo;
464 }
465
Tejun Heoed9e1982008-08-25 19:56:05 +0900466 dname = dev_name(ddev);
467 if (isdigit(dname[strlen(dname) - 1]))
Kay Sievers3ada8b72009-01-06 10:44:43 -0800468 dev_set_name(pdev, "%sp%d", dname, partno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 else
Kay Sievers3ada8b72009-01-06 10:44:43 -0800470 dev_set_name(pdev, "%s%d", dname, partno);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200471
Tejun Heoed9e1982008-08-25 19:56:05 +0900472 device_initialize(pdev);
473 pdev->class = &block_class;
474 pdev->type = &part_type;
475 pdev->parent = ddev;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200476
Tejun Heobcce3de2008-08-25 19:47:22 +0900477 err = blk_alloc_devt(p, &devt);
478 if (err)
Will Drewry6d1d8052010-08-31 15:47:05 -0500479 goto out_free_info;
Tejun Heoed9e1982008-08-25 19:56:05 +0900480 pdev->devt = devt;
Tejun Heobcce3de2008-08-25 19:47:22 +0900481
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200482 /* delay uevent until 'holders' subdir is created */
Ming Leif67f1292009-03-01 21:10:49 +0800483 dev_set_uevent_suppress(pdev, 1);
Tejun Heoed9e1982008-08-25 19:56:05 +0900484 err = device_add(pdev);
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700485 if (err)
Tejun Heo88e34122008-08-25 19:30:16 +0900486 goto out_put;
487
488 err = -ENOMEM;
Tejun Heoed9e1982008-08-25 19:56:05 +0900489 p->holder_dir = kobject_create_and_add("holders", &pdev->kobj);
Tejun Heo88e34122008-08-25 19:30:16 +0900490 if (!p->holder_dir)
491 goto out_del;
492
Ming Leif67f1292009-03-01 21:10:49 +0800493 dev_set_uevent_suppress(pdev, 0);
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700494 if (flags & ADDPART_FLAG_WHOLEDISK) {
Tejun Heoed9e1982008-08-25 19:56:05 +0900495 err = device_create_file(pdev, &dev_attr_whole_disk);
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700496 if (err)
Tejun Heo88e34122008-08-25 19:30:16 +0900497 goto out_del;
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700498 }
Jeff Garzikeee44cc2006-10-17 00:10:23 -0700499
Tejun Heo88e34122008-08-25 19:30:16 +0900500 /* everything is up and running, commence */
Tejun Heo540eed52008-08-25 19:56:15 +0900501 rcu_assign_pointer(ptbl->part[partno], p);
Tejun Heo88e34122008-08-25 19:30:16 +0900502
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200503 /* suppress uevent if the disk supresses it */
Heiko Carstensf8c73c72009-06-11 15:14:40 +0200504 if (!dev_get_uevent_suppress(ddev))
Tejun Heoed9e1982008-08-25 19:56:05 +0900505 kobject_uevent(&pdev->kobj, KOBJ_ADD);
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700506
Jens Axboe6c23a962011-01-07 08:43:37 +0100507 hd_ref_init(p);
Tejun Heoba329292008-11-10 15:29:58 +0900508 return p;
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700509
Will Drewry6d1d8052010-08-31 15:47:05 -0500510out_free_info:
511 free_part_info(p);
Tejun Heoeb60fa12008-11-10 15:28:59 +0900512out_free_stats:
513 free_part_stats(p);
Tejun Heo88e34122008-08-25 19:30:16 +0900514out_free:
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700515 kfree(p);
Tejun Heoba329292008-11-10 15:29:58 +0900516 return ERR_PTR(err);
Tejun Heo88e34122008-08-25 19:30:16 +0900517out_del:
518 kobject_put(p->holder_dir);
Tejun Heoed9e1982008-08-25 19:56:05 +0900519 device_del(pdev);
Tejun Heo88e34122008-08-25 19:30:16 +0900520out_put:
Tejun Heoed9e1982008-08-25 19:56:05 +0900521 put_device(pdev);
Tejun Heobcce3de2008-08-25 19:47:22 +0900522 blk_free_devt(devt);
Tejun Heoba329292008-11-10 15:29:58 +0900523 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524}
525
Tejun Heob403a982010-05-15 20:09:31 +0200526static bool disk_unlock_native_capacity(struct gendisk *disk)
527{
528 const struct block_device_operations *bdops = disk->fops;
529
530 if (bdops->unlock_native_capacity &&
531 !(disk->flags & GENHD_FL_NATIVE_CAPACITY)) {
532 printk(KERN_CONT "enabling native capacity\n");
533 bdops->unlock_native_capacity(disk);
534 disk->flags |= GENHD_FL_NATIVE_CAPACITY;
535 return true;
536 } else {
537 printk(KERN_CONT "truncated\n");
538 return false;
539 }
540}
541
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
543{
Tejun Heob403a982010-05-15 20:09:31 +0200544 struct parsed_partitions *state = NULL;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200545 struct disk_part_iter piter;
546 struct hd_struct *part;
Tejun Heo540eed52008-08-25 19:56:15 +0900547 int p, highest, res;
Tejun Heo56bca012010-05-15 20:09:28 +0200548rescan:
Tejun Heob403a982010-05-15 20:09:31 +0200549 if (state && !IS_ERR(state)) {
550 kfree(state);
551 state = NULL;
552 }
553
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 if (bdev->bd_part_count)
555 return -EBUSY;
556 res = invalidate_partition(disk, 0);
557 if (res)
558 return res;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200559
560 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
561 while ((part = disk_part_iter_next(&piter)))
562 delete_partition(disk, part->partno);
563 disk_part_iter_exit(&piter);
564
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 if (disk->fops->revalidate_disk)
566 disk->fops->revalidate_disk(disk);
Andrew Patterson9bc3ffb2008-09-04 14:27:30 -0600567 check_disk_size_change(disk, bdev);
568 bdev->bd_invalidated = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
570 return 0;
Tejun Heob403a982010-05-15 20:09:31 +0200571 if (IS_ERR(state)) {
572 /*
573 * I/O error reading the partition table. If any
574 * partition code tried to read beyond EOD, retry
575 * after unlocking native capacity.
576 */
577 if (PTR_ERR(state) == -ENOSPC) {
578 printk(KERN_WARNING "%s: partition table beyond EOD, ",
579 disk->disk_name);
580 if (disk_unlock_native_capacity(disk))
581 goto rescan;
582 }
suzukib74a2f02007-03-16 13:38:25 -0800583 return -EIO;
Tejun Heob403a982010-05-15 20:09:31 +0200584 }
585 /*
586 * If any partition code tried to read beyond EOD, try
587 * unlocking native capacity even if partition table is
588 * sucessfully read as we could be missing some partitions.
589 */
590 if (state->access_beyond_eod) {
591 printk(KERN_WARNING
592 "%s: partition table partially beyond EOD, ",
593 disk->disk_name);
594 if (disk_unlock_native_capacity(disk))
595 goto rescan;
596 }
Kay Sievers6bcf19d2008-03-09 21:26:02 +0100597
598 /* tell userspace that the media / partition table may have changed */
Tejun Heoed9e1982008-08-25 19:56:05 +0900599 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
Kay Sievers6bcf19d2008-03-09 21:26:02 +0100600
Tejun Heo540eed52008-08-25 19:56:15 +0900601 /* Detect the highest partition number and preallocate
602 * disk->part_tbl. This is an optimization and not strictly
603 * necessary.
604 */
605 for (p = 1, highest = 0; p < state->limit; p++)
606 if (state->parts[p].size)
607 highest = p;
608
609 disk_expand_part_tbl(disk, highest);
610
611 /* add partitions */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 for (p = 1; p < state->limit; p++) {
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200613 sector_t size, from;
Will Drewry6d1d8052010-08-31 15:47:05 -0500614 struct partition_meta_info *info = NULL;
Tejun Heo56bca012010-05-15 20:09:28 +0200615
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200616 size = state->parts[p].size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 if (!size)
618 continue;
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200619
620 from = state->parts[p].from;
Kay Sieversac0d86f2008-10-15 22:04:21 -0700621 if (from >= get_capacity(disk)) {
Andrew Morton8d99f832008-09-13 02:33:25 -0700622 printk(KERN_WARNING
Tejun Heob403a982010-05-15 20:09:31 +0200623 "%s: p%d start %llu is beyond EOD, ",
Kay Sieversac0d86f2008-10-15 22:04:21 -0700624 disk->disk_name, p, (unsigned long long) from);
Tejun Heob403a982010-05-15 20:09:31 +0200625 if (disk_unlock_native_capacity(disk))
626 goto rescan;
Kay Sieversac0d86f2008-10-15 22:04:21 -0700627 continue;
628 }
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200629
Kay Sieversac0d86f2008-10-15 22:04:21 -0700630 if (from + size > get_capacity(disk)) {
Kay Sieversac0d86f2008-10-15 22:04:21 -0700631 printk(KERN_WARNING
Tejun Heob403a982010-05-15 20:09:31 +0200632 "%s: p%d size %llu extends beyond EOD, ",
Kay Sieversac0d86f2008-10-15 22:04:21 -0700633 disk->disk_name, p, (unsigned long long) size);
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200634
Tejun Heob403a982010-05-15 20:09:31 +0200635 if (disk_unlock_native_capacity(disk)) {
Tejun Heo56bca012010-05-15 20:09:28 +0200636 /* free state and restart */
Tejun Heo56bca012010-05-15 20:09:28 +0200637 goto rescan;
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200638 } else {
639 /*
640 * we can not ignore partitions of broken tables
641 * created by for example camera firmware, but
642 * we limit them to the end of the disk to avoid
643 * creating invalid block devices
644 */
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200645 size = get_capacity(disk) - from;
646 }
Mike Miller98bd34e2006-06-23 02:06:07 -0700647 }
Will Drewry6d1d8052010-08-31 15:47:05 -0500648
649 if (state->parts[p].has_info)
650 info = &state->parts[p].info;
Tejun Heoba329292008-11-10 15:29:58 +0900651 part = add_partition(disk, p, from, size,
Will Drewry6d1d8052010-08-31 15:47:05 -0500652 state->parts[p].flags,
653 &state->parts[p].info);
Tejun Heoba329292008-11-10 15:29:58 +0900654 if (IS_ERR(part)) {
655 printk(KERN_ERR " %s: p%d could not be added: %ld\n",
656 disk->disk_name, p, -PTR_ERR(part));
Abdel Benamrouche04ebd4a2008-07-25 01:48:26 -0700657 continue;
658 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659#ifdef CONFIG_BLK_DEV_MD
Fabio Massimo Di Nittod18d7682007-02-10 23:50:00 -0800660 if (state->parts[p].flags & ADDPART_FLAG_RAID)
Tejun Heo55e8e302008-11-10 15:30:47 +0900661 md_autodetect_dev(part_to_dev(part)->devt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662#endif
663 }
664 kfree(state);
665 return 0;
666}
667
668unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
669{
670 struct address_space *mapping = bdev->bd_inode->i_mapping;
671 struct page *page;
672
Pekka Enberg090d2b12006-06-23 02:05:08 -0700673 page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
674 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 if (!IS_ERR(page)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 if (PageError(page))
677 goto fail;
678 p->v = page;
679 return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9);
680fail:
681 page_cache_release(page);
682 }
683 p->v = NULL;
684 return NULL;
685}
686
687EXPORT_SYMBOL(read_dev_sector);