blob: 79fbf3f390f04c8bf370d4d92b8441116f473b06 [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
Martin K. Petersenc72758f2009-05-22 17:17:53 -0400240ssize_t part_alignment_offset_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, "%llu\n", (unsigned long long)p->alignment_offset);
245}
246
Martin K. Petersen86b37282009-11-10 11:50:21 +0100247ssize_t part_discard_alignment_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, "%u\n", p->discard_alignment);
252}
253
Tejun Heo074a7ac2008-08-25 19:56:14 +0900254ssize_t part_stat_show(struct device *dev,
255 struct device_attribute *attr, char *buf)
Kay Sieversa7fd6702005-10-01 14:49:43 +0200256{
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200257 struct hd_struct *p = dev_to_part(dev);
Tejun Heoc9959052008-08-25 19:47:21 +0900258 int cpu;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200259
Tejun Heo074a7ac2008-08-25 19:56:14 +0900260 cpu = part_stat_lock();
Tejun Heoc9959052008-08-25 19:47:21 +0900261 part_round_stats(cpu, p);
Tejun Heo074a7ac2008-08-25 19:56:14 +0900262 part_stat_unlock();
Jerome Marchand34e8bea2008-02-08 11:04:55 +0100263 return sprintf(buf,
264 "%8lu %8lu %8llu %8u "
265 "%8lu %8lu %8llu %8u "
266 "%8u %8u %8u"
267 "\n",
268 part_stat_read(p, ios[READ]),
269 part_stat_read(p, merges[READ]),
270 (unsigned long long)part_stat_read(p, sectors[READ]),
271 jiffies_to_msecs(part_stat_read(p, ticks[READ])),
272 part_stat_read(p, ios[WRITE]),
273 part_stat_read(p, merges[WRITE]),
274 (unsigned long long)part_stat_read(p, sectors[WRITE]),
275 jiffies_to_msecs(part_stat_read(p, ticks[WRITE])),
Nikanth Karthikesan316d3152009-10-06 20:16:55 +0200276 part_in_flight(p),
Jerome Marchand34e8bea2008-02-08 11:04:55 +0100277 jiffies_to_msecs(part_stat_read(p, io_ticks)),
278 jiffies_to_msecs(part_stat_read(p, time_in_queue)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280
Nikanth Karthikesan316d3152009-10-06 20:16:55 +0200281ssize_t part_inflight_show(struct device *dev,
282 struct device_attribute *attr, char *buf)
283{
284 struct hd_struct *p = dev_to_part(dev);
285
286 return sprintf(buf, "%8u %8u\n", p->in_flight[0], p->in_flight[1]);
287}
288
Akinobu Mitac17bb492006-12-08 02:39:46 -0800289#ifdef CONFIG_FAIL_MAKE_REQUEST
Tejun Heoeddb2e22008-08-25 19:56:13 +0900290ssize_t part_fail_show(struct device *dev,
291 struct device_attribute *attr, char *buf)
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200292{
293 struct hd_struct *p = dev_to_part(dev);
Akinobu Mitac17bb492006-12-08 02:39:46 -0800294
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200295 return sprintf(buf, "%d\n", p->make_it_fail);
296}
297
Tejun Heoeddb2e22008-08-25 19:56:13 +0900298ssize_t part_fail_store(struct device *dev,
299 struct device_attribute *attr,
300 const char *buf, size_t count)
Akinobu Mitac17bb492006-12-08 02:39:46 -0800301{
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200302 struct hd_struct *p = dev_to_part(dev);
Akinobu Mitac17bb492006-12-08 02:39:46 -0800303 int i;
304
305 if (count > 0 && sscanf(buf, "%d", &i) > 0)
306 p->make_it_fail = (i == 0) ? 0 : 1;
307
308 return count;
309}
Akinobu Mitac17bb492006-12-08 02:39:46 -0800310#endif
311
Tejun Heo0fc71e32008-10-13 13:27:59 +0200312static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200313static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL);
314static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
Martin K. Petersenc72758f2009-05-22 17:17:53 -0400315static DEVICE_ATTR(alignment_offset, S_IRUGO, part_alignment_offset_show, NULL);
Martin K. Petersen86b37282009-11-10 11:50:21 +0100316static DEVICE_ATTR(discard_alignment, S_IRUGO, part_discard_alignment_show,
317 NULL);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200318static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
Nikanth Karthikesan316d3152009-10-06 20:16:55 +0200319static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL);
Akinobu Mitac17bb492006-12-08 02:39:46 -0800320#ifdef CONFIG_FAIL_MAKE_REQUEST
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200321static struct device_attribute dev_attr_fail =
322 __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store);
Akinobu Mitac17bb492006-12-08 02:39:46 -0800323#endif
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200324
325static struct attribute *part_attrs[] = {
Tejun Heo0fc71e32008-10-13 13:27:59 +0200326 &dev_attr_partition.attr,
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200327 &dev_attr_start.attr,
328 &dev_attr_size.attr,
Martin K. Petersenc72758f2009-05-22 17:17:53 -0400329 &dev_attr_alignment_offset.attr,
Martin K. Petersen86b37282009-11-10 11:50:21 +0100330 &dev_attr_discard_alignment.attr,
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200331 &dev_attr_stat.attr,
Nikanth Karthikesan316d3152009-10-06 20:16:55 +0200332 &dev_attr_inflight.attr,
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200333#ifdef CONFIG_FAIL_MAKE_REQUEST
334 &dev_attr_fail.attr,
335#endif
336 NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337};
338
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200339static struct attribute_group part_attr_group = {
340 .attrs = part_attrs,
341};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342
David Brownella4dbd672009-06-24 10:06:31 -0700343static const struct attribute_group *part_attr_groups[] = {
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200344 &part_attr_group,
Arnaldo Carvalho de Meloc71a8962009-01-23 12:06:27 -0200345#ifdef CONFIG_BLK_DEV_IO_TRACE
346 &blk_trace_attr_group,
347#endif
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200348 NULL
349};
350
351static void part_release(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352{
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200353 struct hd_struct *p = dev_to_part(dev);
Jerome Marchand6f2576a2008-02-08 11:04:35 +0100354 free_part_stats(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 kfree(p);
356}
357
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200358struct device_type part_type = {
359 .name = "partition",
360 .groups = part_attr_groups,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 .release = part_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362};
363
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200364static void delete_partition_rcu_cb(struct rcu_head *head)
365{
366 struct hd_struct *part = container_of(head, struct hd_struct, rcu_head);
367
368 part->start_sect = 0;
369 part->nr_sects = 0;
370 part_stat_set_all(part, 0);
Tejun Heoed9e1982008-08-25 19:56:05 +0900371 put_device(part_to_dev(part));
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200372}
373
Tejun Heocf771cb2008-09-03 09:01:09 +0200374void delete_partition(struct gendisk *disk, int partno)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375{
Tejun Heo540eed52008-08-25 19:56:15 +0900376 struct disk_part_tbl *ptbl = disk->part_tbl;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200377 struct hd_struct *part;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200378
Tejun Heo540eed52008-08-25 19:56:15 +0900379 if (partno >= ptbl->len)
380 return;
381
382 part = ptbl->part[partno];
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200383 if (!part)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 return;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200385
Tejun Heobcce3de2008-08-25 19:47:22 +0900386 blk_free_devt(part_devt(part));
Tejun Heo540eed52008-08-25 19:56:15 +0900387 rcu_assign_pointer(ptbl->part[partno], NULL);
Neil Brown54b0d122009-01-07 08:55:39 +0100388 rcu_assign_pointer(ptbl->last_lookup, NULL);
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200389 kobject_put(part->holder_dir);
Tejun Heoed9e1982008-08-25 19:56:05 +0900390 device_del(part_to_dev(part));
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200391
392 call_rcu(&part->rcu_head, delete_partition_rcu_cb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393}
394
Greg Kroah-Hartmanf4a00a22008-02-06 23:33:39 -0800395static ssize_t whole_disk_show(struct device *dev,
396 struct device_attribute *attr, char *buf)
397{
398 return 0;
399}
400static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH,
401 whole_disk_show, NULL);
402
Tejun Heoba329292008-11-10 15:29:58 +0900403struct hd_struct *add_partition(struct gendisk *disk, int partno,
404 sector_t start, sector_t len, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405{
406 struct hd_struct *p;
Tejun Heobcce3de2008-08-25 19:47:22 +0900407 dev_t devt = MKDEV(0, 0);
Tejun Heoed9e1982008-08-25 19:56:05 +0900408 struct device *ddev = disk_to_dev(disk);
409 struct device *pdev;
Tejun Heo540eed52008-08-25 19:56:15 +0900410 struct disk_part_tbl *ptbl;
Tejun Heoed9e1982008-08-25 19:56:05 +0900411 const char *dname;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200412 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413
Tejun Heo540eed52008-08-25 19:56:15 +0900414 err = disk_expand_part_tbl(disk, partno);
415 if (err)
Tejun Heoba329292008-11-10 15:29:58 +0900416 return ERR_PTR(err);
Tejun Heo540eed52008-08-25 19:56:15 +0900417 ptbl = disk->part_tbl;
418
419 if (ptbl->part[partno])
Tejun Heoba329292008-11-10 15:29:58 +0900420 return ERR_PTR(-EBUSY);
Tejun Heo88e34122008-08-25 19:30:16 +0900421
Yoann Padioleaudd00cc42007-07-19 01:49:03 -0700422 p = kzalloc(sizeof(*p), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 if (!p)
Tejun Heoba329292008-11-10 15:29:58 +0900424 return ERR_PTR(-EBUSY);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200425
Jerome Marchand6f2576a2008-02-08 11:04:35 +0100426 if (!init_part_stats(p)) {
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700427 err = -ENOMEM;
Tejun Heo88e34122008-08-25 19:30:16 +0900428 goto out_free;
Jerome Marchand6f2576a2008-02-08 11:04:35 +0100429 }
Tejun Heoed9e1982008-08-25 19:56:05 +0900430 pdev = part_to_dev(p);
431
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 p->start_sect = start;
Martin K. Petersene03a72e2010-01-11 03:21:51 -0500433 p->alignment_offset =
434 queue_limit_alignment_offset(&disk->queue->limits, start);
435 p->discard_alignment =
436 queue_limit_discard_alignment(&disk->queue->limits, start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 p->nr_sects = len;
Tejun Heocf771cb2008-09-03 09:01:09 +0200438 p->partno = partno;
Tejun Heob7db9952008-08-25 19:56:10 +0900439 p->policy = get_disk_ro(disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440
Tejun Heoed9e1982008-08-25 19:56:05 +0900441 dname = dev_name(ddev);
442 if (isdigit(dname[strlen(dname) - 1]))
Kay Sievers3ada8b72009-01-06 10:44:43 -0800443 dev_set_name(pdev, "%sp%d", dname, partno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 else
Kay Sievers3ada8b72009-01-06 10:44:43 -0800445 dev_set_name(pdev, "%s%d", dname, partno);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200446
Tejun Heoed9e1982008-08-25 19:56:05 +0900447 device_initialize(pdev);
448 pdev->class = &block_class;
449 pdev->type = &part_type;
450 pdev->parent = ddev;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200451
Tejun Heobcce3de2008-08-25 19:47:22 +0900452 err = blk_alloc_devt(p, &devt);
453 if (err)
Tejun Heoeb60fa12008-11-10 15:28:59 +0900454 goto out_free_stats;
Tejun Heoed9e1982008-08-25 19:56:05 +0900455 pdev->devt = devt;
Tejun Heobcce3de2008-08-25 19:47:22 +0900456
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200457 /* delay uevent until 'holders' subdir is created */
Ming Leif67f1292009-03-01 21:10:49 +0800458 dev_set_uevent_suppress(pdev, 1);
Tejun Heoed9e1982008-08-25 19:56:05 +0900459 err = device_add(pdev);
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700460 if (err)
Tejun Heo88e34122008-08-25 19:30:16 +0900461 goto out_put;
462
463 err = -ENOMEM;
Tejun Heoed9e1982008-08-25 19:56:05 +0900464 p->holder_dir = kobject_create_and_add("holders", &pdev->kobj);
Tejun Heo88e34122008-08-25 19:30:16 +0900465 if (!p->holder_dir)
466 goto out_del;
467
Ming Leif67f1292009-03-01 21:10:49 +0800468 dev_set_uevent_suppress(pdev, 0);
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700469 if (flags & ADDPART_FLAG_WHOLEDISK) {
Tejun Heoed9e1982008-08-25 19:56:05 +0900470 err = device_create_file(pdev, &dev_attr_whole_disk);
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700471 if (err)
Tejun Heo88e34122008-08-25 19:30:16 +0900472 goto out_del;
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700473 }
Jeff Garzikeee44cc2006-10-17 00:10:23 -0700474
Tejun Heo88e34122008-08-25 19:30:16 +0900475 /* everything is up and running, commence */
Tejun Heo540eed52008-08-25 19:56:15 +0900476 rcu_assign_pointer(ptbl->part[partno], p);
Tejun Heo88e34122008-08-25 19:30:16 +0900477
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200478 /* suppress uevent if the disk supresses it */
Heiko Carstensf8c73c72009-06-11 15:14:40 +0200479 if (!dev_get_uevent_suppress(ddev))
Tejun Heoed9e1982008-08-25 19:56:05 +0900480 kobject_uevent(&pdev->kobj, KOBJ_ADD);
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700481
Tejun Heoba329292008-11-10 15:29:58 +0900482 return p;
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700483
Tejun Heoeb60fa12008-11-10 15:28:59 +0900484out_free_stats:
485 free_part_stats(p);
Tejun Heo88e34122008-08-25 19:30:16 +0900486out_free:
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700487 kfree(p);
Tejun Heoba329292008-11-10 15:29:58 +0900488 return ERR_PTR(err);
Tejun Heo88e34122008-08-25 19:30:16 +0900489out_del:
490 kobject_put(p->holder_dir);
Tejun Heoed9e1982008-08-25 19:56:05 +0900491 device_del(pdev);
Tejun Heo88e34122008-08-25 19:30:16 +0900492out_put:
Tejun Heoed9e1982008-08-25 19:56:05 +0900493 put_device(pdev);
Tejun Heobcce3de2008-08-25 19:47:22 +0900494 blk_free_devt(devt);
Tejun Heoba329292008-11-10 15:29:58 +0900495 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496}
497
498/* Not exported, helper to add_disk(). */
499void register_disk(struct gendisk *disk)
500{
Tejun Heoed9e1982008-08-25 19:56:05 +0900501 struct device *ddev = disk_to_dev(disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 struct block_device *bdev;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200503 struct disk_part_iter piter;
504 struct hd_struct *part;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 int err;
506
Tejun Heoed9e1982008-08-25 19:56:05 +0900507 ddev->parent = disk->driverfs_dev;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200508
Kay Sievers3ada8b72009-01-06 10:44:43 -0800509 dev_set_name(ddev, disk->disk_name);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200510
511 /* delay uevents, until we scanned partition table */
Ming Leif67f1292009-03-01 21:10:49 +0800512 dev_set_uevent_suppress(ddev, 1);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200513
Tejun Heoed9e1982008-08-25 19:56:05 +0900514 if (device_add(ddev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 return;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200516#ifndef CONFIG_SYSFS_DEPRECATED
Tejun Heoed9e1982008-08-25 19:56:05 +0900517 err = sysfs_create_link(block_depr, &ddev->kobj,
518 kobject_name(&ddev->kobj));
Jeff Garzikeee44cc2006-10-17 00:10:23 -0700519 if (err) {
Tejun Heoed9e1982008-08-25 19:56:05 +0900520 device_del(ddev);
Jeff Garzikeee44cc2006-10-17 00:10:23 -0700521 return;
522 }
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200523#endif
Tejun Heo4c465012008-08-25 19:56:11 +0900524 disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj);
525 disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526
527 /* No minors to use for partitions */
Tejun Heob5d0b9d2008-09-03 09:06:42 +0200528 if (!disk_partitionable(disk))
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100529 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530
531 /* No such device (e.g., media were just removed) */
532 if (!get_capacity(disk))
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100533 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534
535 bdev = bdget_disk(disk, 0);
536 if (!bdev)
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100537 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538
539 bdev->bd_invalidated = 1;
Al Viro572c4892007-10-08 13:24:05 -0400540 err = blkdev_get(bdev, FMODE_READ);
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100541 if (err < 0)
542 goto exit;
Al Viro9a1c3542008-02-22 20:40:24 -0500543 blkdev_put(bdev, FMODE_READ);
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100544
545exit:
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200546 /* announce disk after possible partitions are created */
Ming Leif67f1292009-03-01 21:10:49 +0800547 dev_set_uevent_suppress(ddev, 0);
Tejun Heoed9e1982008-08-25 19:56:05 +0900548 kobject_uevent(&ddev->kobj, KOBJ_ADD);
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100549
550 /* announce possible partitions */
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200551 disk_part_iter_init(&piter, disk, 0);
552 while ((part = disk_part_iter_next(&piter)))
Tejun Heoed9e1982008-08-25 19:56:05 +0900553 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD);
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200554 disk_part_iter_exit(&piter);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555}
556
Tejun Heob403a982010-05-15 20:09:31 +0200557static bool disk_unlock_native_capacity(struct gendisk *disk)
558{
559 const struct block_device_operations *bdops = disk->fops;
560
561 if (bdops->unlock_native_capacity &&
562 !(disk->flags & GENHD_FL_NATIVE_CAPACITY)) {
563 printk(KERN_CONT "enabling native capacity\n");
564 bdops->unlock_native_capacity(disk);
565 disk->flags |= GENHD_FL_NATIVE_CAPACITY;
566 return true;
567 } else {
568 printk(KERN_CONT "truncated\n");
569 return false;
570 }
571}
572
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
574{
Tejun Heob403a982010-05-15 20:09:31 +0200575 struct parsed_partitions *state = NULL;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200576 struct disk_part_iter piter;
577 struct hd_struct *part;
Tejun Heo540eed52008-08-25 19:56:15 +0900578 int p, highest, res;
Tejun Heo56bca012010-05-15 20:09:28 +0200579rescan:
Tejun Heob403a982010-05-15 20:09:31 +0200580 if (state && !IS_ERR(state)) {
581 kfree(state);
582 state = NULL;
583 }
584
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 if (bdev->bd_part_count)
586 return -EBUSY;
587 res = invalidate_partition(disk, 0);
588 if (res)
589 return res;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200590
591 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
592 while ((part = disk_part_iter_next(&piter)))
593 delete_partition(disk, part->partno);
594 disk_part_iter_exit(&piter);
595
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 if (disk->fops->revalidate_disk)
597 disk->fops->revalidate_disk(disk);
Andrew Patterson9bc3ffb2008-09-04 14:27:30 -0600598 check_disk_size_change(disk, bdev);
599 bdev->bd_invalidated = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
601 return 0;
Tejun Heob403a982010-05-15 20:09:31 +0200602 if (IS_ERR(state)) {
603 /*
604 * I/O error reading the partition table. If any
605 * partition code tried to read beyond EOD, retry
606 * after unlocking native capacity.
607 */
608 if (PTR_ERR(state) == -ENOSPC) {
609 printk(KERN_WARNING "%s: partition table beyond EOD, ",
610 disk->disk_name);
611 if (disk_unlock_native_capacity(disk))
612 goto rescan;
613 }
suzukib74a2f02007-03-16 13:38:25 -0800614 return -EIO;
Tejun Heob403a982010-05-15 20:09:31 +0200615 }
616 /*
617 * If any partition code tried to read beyond EOD, try
618 * unlocking native capacity even if partition table is
619 * sucessfully read as we could be missing some partitions.
620 */
621 if (state->access_beyond_eod) {
622 printk(KERN_WARNING
623 "%s: partition table partially beyond EOD, ",
624 disk->disk_name);
625 if (disk_unlock_native_capacity(disk))
626 goto rescan;
627 }
Kay Sievers6bcf19d2008-03-09 21:26:02 +0100628
629 /* tell userspace that the media / partition table may have changed */
Tejun Heoed9e1982008-08-25 19:56:05 +0900630 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
Kay Sievers6bcf19d2008-03-09 21:26:02 +0100631
Tejun Heo540eed52008-08-25 19:56:15 +0900632 /* Detect the highest partition number and preallocate
633 * disk->part_tbl. This is an optimization and not strictly
634 * necessary.
635 */
636 for (p = 1, highest = 0; p < state->limit; p++)
637 if (state->parts[p].size)
638 highest = p;
639
640 disk_expand_part_tbl(disk, highest);
641
642 /* add partitions */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 for (p = 1; p < state->limit; p++) {
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200644 sector_t size, from;
Tejun Heo56bca012010-05-15 20:09:28 +0200645
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200646 size = state->parts[p].size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 if (!size)
648 continue;
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200649
650 from = state->parts[p].from;
Kay Sieversac0d86f2008-10-15 22:04:21 -0700651 if (from >= get_capacity(disk)) {
Andrew Morton8d99f832008-09-13 02:33:25 -0700652 printk(KERN_WARNING
Tejun Heob403a982010-05-15 20:09:31 +0200653 "%s: p%d start %llu is beyond EOD, ",
Kay Sieversac0d86f2008-10-15 22:04:21 -0700654 disk->disk_name, p, (unsigned long long) from);
Tejun Heob403a982010-05-15 20:09:31 +0200655 if (disk_unlock_native_capacity(disk))
656 goto rescan;
Kay Sieversac0d86f2008-10-15 22:04:21 -0700657 continue;
658 }
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200659
Kay Sieversac0d86f2008-10-15 22:04:21 -0700660 if (from + size > get_capacity(disk)) {
Kay Sieversac0d86f2008-10-15 22:04:21 -0700661 printk(KERN_WARNING
Tejun Heob403a982010-05-15 20:09:31 +0200662 "%s: p%d size %llu extends beyond EOD, ",
Kay Sieversac0d86f2008-10-15 22:04:21 -0700663 disk->disk_name, p, (unsigned long long) size);
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200664
Tejun Heob403a982010-05-15 20:09:31 +0200665 if (disk_unlock_native_capacity(disk)) {
Tejun Heo56bca012010-05-15 20:09:28 +0200666 /* free state and restart */
Tejun Heo56bca012010-05-15 20:09:28 +0200667 goto rescan;
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200668 } else {
669 /*
670 * we can not ignore partitions of broken tables
671 * created by for example camera firmware, but
672 * we limit them to the end of the disk to avoid
673 * creating invalid block devices
674 */
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200675 size = get_capacity(disk) - from;
676 }
Mike Miller98bd34e2006-06-23 02:06:07 -0700677 }
Tejun Heoba329292008-11-10 15:29:58 +0900678 part = add_partition(disk, p, from, size,
679 state->parts[p].flags);
680 if (IS_ERR(part)) {
681 printk(KERN_ERR " %s: p%d could not be added: %ld\n",
682 disk->disk_name, p, -PTR_ERR(part));
Abdel Benamrouche04ebd4a2008-07-25 01:48:26 -0700683 continue;
684 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685#ifdef CONFIG_BLK_DEV_MD
Fabio Massimo Di Nittod18d7682007-02-10 23:50:00 -0800686 if (state->parts[p].flags & ADDPART_FLAG_RAID)
Tejun Heo55e8e302008-11-10 15:30:47 +0900687 md_autodetect_dev(part_to_dev(part)->devt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688#endif
689 }
690 kfree(state);
691 return 0;
692}
693
694unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
695{
696 struct address_space *mapping = bdev->bd_inode->i_mapping;
697 struct page *page;
698
Pekka Enberg090d2b12006-06-23 02:05:08 -0700699 page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
700 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 if (!IS_ERR(page)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 if (PageError(page))
703 goto fail;
704 p->v = page;
705 return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9);
706fail:
707 page_cache_release(page);
708 }
709 p->v = NULL;
710 return NULL;
711}
712
713EXPORT_SYMBOL(read_dev_sector);
714
715void del_gendisk(struct gendisk *disk)
716{
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200717 struct disk_part_iter piter;
718 struct hd_struct *part;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719
720 /* invalidate stuff */
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200721 disk_part_iter_init(&piter, disk,
722 DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE);
723 while ((part = disk_part_iter_next(&piter))) {
724 invalidate_partition(disk, part->partno);
725 delete_partition(disk, part->partno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 }
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200727 disk_part_iter_exit(&piter);
728
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 invalidate_partition(disk, 0);
Tejun Heo3e1a7ff2008-08-25 19:56:17 +0900730 blk_free_devt(disk_to_dev(disk)->devt);
Tejun Heo80795ae2008-08-25 19:56:07 +0900731 set_capacity(disk, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 disk->flags &= ~GENHD_FL_UP;
733 unlink_gendisk(disk);
Tejun Heo074a7ac2008-08-25 19:56:14 +0900734 part_stat_set_all(&disk->part0, 0);
735 disk->part0.stamp = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736
Tejun Heo4c465012008-08-25 19:56:11 +0900737 kobject_put(disk->part0.holder_dir);
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -0800738 kobject_put(disk->slave_dir);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200739 disk->driverfs_dev = NULL;
740#ifndef CONFIG_SYSFS_DEPRECATED
Tejun Heoed9e1982008-08-25 19:56:05 +0900741 sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk)));
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200742#endif
Tejun Heoed9e1982008-08-25 19:56:05 +0900743 device_del(disk_to_dev(disk));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744}