blob: a19995c6f6afa99a28b3ed63524a8488e4895435 [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
164 state = kmalloc(sizeof(struct parsed_partitions), GFP_KERNEL);
165 if (!state)
166 return NULL;
167
Tejun Heo1493bf22010-05-15 20:09:30 +0200168 state->bdev = bdev;
Greg Kroah-Hartmana2964182005-06-20 21:15:16 -0700169 disk_name(hd, 0, state->name);
170 printk(KERN_INFO " %s:", state->name);
171 if (isdigit(state->name[strlen(state->name)-1]))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 sprintf(state->name, "p");
Greg Kroah-Hartmana2964182005-06-20 21:15:16 -0700173
Tejun Heob5d0b9d2008-09-03 09:06:42 +0200174 state->limit = disk_max_parts(hd);
Suzuki K P57881dd2006-12-06 20:35:16 -0800175 i = res = err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 while (!res && check_part[i]) {
177 memset(&state->parts, 0, sizeof(state->parts));
Tejun Heo1493bf22010-05-15 20:09:30 +0200178 res = check_part[i++](state);
Suzuki K P57881dd2006-12-06 20:35:16 -0800179 if (res < 0) {
180 /* We have hit an I/O error which we don't report now.
181 * But record it, and let the others do their job.
182 */
183 err = res;
184 res = 0;
185 }
186
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 }
188 if (res > 0)
189 return state;
suzuki9bebff62007-03-07 20:41:24 -0800190 if (err)
Suzuki K P57881dd2006-12-06 20:35:16 -0800191 /* The partition is unrecognized. So report I/O errors if there were any */
192 res = err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 if (!res)
194 printk(" unknown partition table\n");
195 else if (warn_no_part)
196 printk(" unable to read partition table\n");
197 kfree(state);
Suzuki Kp5127d002006-12-06 20:35:14 -0800198 return ERR_PTR(res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199}
200
Tejun Heo0fc71e32008-10-13 13:27:59 +0200201static ssize_t part_partition_show(struct device *dev,
202 struct device_attribute *attr, char *buf)
203{
204 struct hd_struct *p = dev_to_part(dev);
205
206 return sprintf(buf, "%d\n", p->partno);
207}
208
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200209static ssize_t part_start_show(struct device *dev,
210 struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211{
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200212 struct hd_struct *p = dev_to_part(dev);
Kay Sieversa7fd6702005-10-01 14:49:43 +0200213
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200214 return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215}
216
Tejun Heoe5610522008-08-25 19:56:09 +0900217ssize_t part_size_show(struct device *dev,
218 struct device_attribute *attr, char *buf)
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200219{
220 struct hd_struct *p = dev_to_part(dev);
221 return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects);
222}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
Martin K. Petersenc72758f2009-05-22 17:17:53 -0400224ssize_t part_alignment_offset_show(struct device *dev,
225 struct device_attribute *attr, char *buf)
226{
227 struct hd_struct *p = dev_to_part(dev);
228 return sprintf(buf, "%llu\n", (unsigned long long)p->alignment_offset);
229}
230
Martin K. Petersen86b37282009-11-10 11:50:21 +0100231ssize_t part_discard_alignment_show(struct device *dev,
232 struct device_attribute *attr, char *buf)
233{
234 struct hd_struct *p = dev_to_part(dev);
235 return sprintf(buf, "%u\n", p->discard_alignment);
236}
237
Tejun Heo074a7ac2008-08-25 19:56:14 +0900238ssize_t part_stat_show(struct device *dev,
239 struct device_attribute *attr, char *buf)
Kay Sieversa7fd6702005-10-01 14:49:43 +0200240{
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200241 struct hd_struct *p = dev_to_part(dev);
Tejun Heoc9959052008-08-25 19:47:21 +0900242 int cpu;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200243
Tejun Heo074a7ac2008-08-25 19:56:14 +0900244 cpu = part_stat_lock();
Tejun Heoc9959052008-08-25 19:47:21 +0900245 part_round_stats(cpu, p);
Tejun Heo074a7ac2008-08-25 19:56:14 +0900246 part_stat_unlock();
Jerome Marchand34e8bea2008-02-08 11:04:55 +0100247 return sprintf(buf,
248 "%8lu %8lu %8llu %8u "
249 "%8lu %8lu %8llu %8u "
250 "%8u %8u %8u"
251 "\n",
252 part_stat_read(p, ios[READ]),
253 part_stat_read(p, merges[READ]),
254 (unsigned long long)part_stat_read(p, sectors[READ]),
255 jiffies_to_msecs(part_stat_read(p, ticks[READ])),
256 part_stat_read(p, ios[WRITE]),
257 part_stat_read(p, merges[WRITE]),
258 (unsigned long long)part_stat_read(p, sectors[WRITE]),
259 jiffies_to_msecs(part_stat_read(p, ticks[WRITE])),
Nikanth Karthikesan316d3152009-10-06 20:16:55 +0200260 part_in_flight(p),
Jerome Marchand34e8bea2008-02-08 11:04:55 +0100261 jiffies_to_msecs(part_stat_read(p, io_ticks)),
262 jiffies_to_msecs(part_stat_read(p, time_in_queue)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264
Nikanth Karthikesan316d3152009-10-06 20:16:55 +0200265ssize_t part_inflight_show(struct device *dev,
266 struct device_attribute *attr, char *buf)
267{
268 struct hd_struct *p = dev_to_part(dev);
269
270 return sprintf(buf, "%8u %8u\n", p->in_flight[0], p->in_flight[1]);
271}
272
Akinobu Mitac17bb492006-12-08 02:39:46 -0800273#ifdef CONFIG_FAIL_MAKE_REQUEST
Tejun Heoeddb2e22008-08-25 19:56:13 +0900274ssize_t part_fail_show(struct device *dev,
275 struct device_attribute *attr, char *buf)
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200276{
277 struct hd_struct *p = dev_to_part(dev);
Akinobu Mitac17bb492006-12-08 02:39:46 -0800278
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200279 return sprintf(buf, "%d\n", p->make_it_fail);
280}
281
Tejun Heoeddb2e22008-08-25 19:56:13 +0900282ssize_t part_fail_store(struct device *dev,
283 struct device_attribute *attr,
284 const char *buf, size_t count)
Akinobu Mitac17bb492006-12-08 02:39:46 -0800285{
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200286 struct hd_struct *p = dev_to_part(dev);
Akinobu Mitac17bb492006-12-08 02:39:46 -0800287 int i;
288
289 if (count > 0 && sscanf(buf, "%d", &i) > 0)
290 p->make_it_fail = (i == 0) ? 0 : 1;
291
292 return count;
293}
Akinobu Mitac17bb492006-12-08 02:39:46 -0800294#endif
295
Tejun Heo0fc71e32008-10-13 13:27:59 +0200296static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200297static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL);
298static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
Martin K. Petersenc72758f2009-05-22 17:17:53 -0400299static DEVICE_ATTR(alignment_offset, S_IRUGO, part_alignment_offset_show, NULL);
Martin K. Petersen86b37282009-11-10 11:50:21 +0100300static DEVICE_ATTR(discard_alignment, S_IRUGO, part_discard_alignment_show,
301 NULL);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200302static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
Nikanth Karthikesan316d3152009-10-06 20:16:55 +0200303static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL);
Akinobu Mitac17bb492006-12-08 02:39:46 -0800304#ifdef CONFIG_FAIL_MAKE_REQUEST
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200305static struct device_attribute dev_attr_fail =
306 __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store);
Akinobu Mitac17bb492006-12-08 02:39:46 -0800307#endif
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200308
309static struct attribute *part_attrs[] = {
Tejun Heo0fc71e32008-10-13 13:27:59 +0200310 &dev_attr_partition.attr,
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200311 &dev_attr_start.attr,
312 &dev_attr_size.attr,
Martin K. Petersenc72758f2009-05-22 17:17:53 -0400313 &dev_attr_alignment_offset.attr,
Martin K. Petersen86b37282009-11-10 11:50:21 +0100314 &dev_attr_discard_alignment.attr,
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200315 &dev_attr_stat.attr,
Nikanth Karthikesan316d3152009-10-06 20:16:55 +0200316 &dev_attr_inflight.attr,
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200317#ifdef CONFIG_FAIL_MAKE_REQUEST
318 &dev_attr_fail.attr,
319#endif
320 NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321};
322
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200323static struct attribute_group part_attr_group = {
324 .attrs = part_attrs,
325};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
David Brownella4dbd672009-06-24 10:06:31 -0700327static const struct attribute_group *part_attr_groups[] = {
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200328 &part_attr_group,
Arnaldo Carvalho de Meloc71a8962009-01-23 12:06:27 -0200329#ifdef CONFIG_BLK_DEV_IO_TRACE
330 &blk_trace_attr_group,
331#endif
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200332 NULL
333};
334
335static void part_release(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336{
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200337 struct hd_struct *p = dev_to_part(dev);
Jerome Marchand6f2576a2008-02-08 11:04:35 +0100338 free_part_stats(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 kfree(p);
340}
341
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200342struct device_type part_type = {
343 .name = "partition",
344 .groups = part_attr_groups,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 .release = part_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346};
347
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200348static void delete_partition_rcu_cb(struct rcu_head *head)
349{
350 struct hd_struct *part = container_of(head, struct hd_struct, rcu_head);
351
352 part->start_sect = 0;
353 part->nr_sects = 0;
354 part_stat_set_all(part, 0);
Tejun Heoed9e1982008-08-25 19:56:05 +0900355 put_device(part_to_dev(part));
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200356}
357
Tejun Heocf771cb2008-09-03 09:01:09 +0200358void delete_partition(struct gendisk *disk, int partno)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359{
Tejun Heo540eed52008-08-25 19:56:15 +0900360 struct disk_part_tbl *ptbl = disk->part_tbl;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200361 struct hd_struct *part;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200362
Tejun Heo540eed52008-08-25 19:56:15 +0900363 if (partno >= ptbl->len)
364 return;
365
366 part = ptbl->part[partno];
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200367 if (!part)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 return;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200369
Tejun Heobcce3de2008-08-25 19:47:22 +0900370 blk_free_devt(part_devt(part));
Tejun Heo540eed52008-08-25 19:56:15 +0900371 rcu_assign_pointer(ptbl->part[partno], NULL);
Neil Brown54b0d122009-01-07 08:55:39 +0100372 rcu_assign_pointer(ptbl->last_lookup, NULL);
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200373 kobject_put(part->holder_dir);
Tejun Heoed9e1982008-08-25 19:56:05 +0900374 device_del(part_to_dev(part));
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200375
376 call_rcu(&part->rcu_head, delete_partition_rcu_cb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377}
378
Greg Kroah-Hartmanf4a00a22008-02-06 23:33:39 -0800379static ssize_t whole_disk_show(struct device *dev,
380 struct device_attribute *attr, char *buf)
381{
382 return 0;
383}
384static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH,
385 whole_disk_show, NULL);
386
Tejun Heoba329292008-11-10 15:29:58 +0900387struct hd_struct *add_partition(struct gendisk *disk, int partno,
388 sector_t start, sector_t len, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389{
390 struct hd_struct *p;
Tejun Heobcce3de2008-08-25 19:47:22 +0900391 dev_t devt = MKDEV(0, 0);
Tejun Heoed9e1982008-08-25 19:56:05 +0900392 struct device *ddev = disk_to_dev(disk);
393 struct device *pdev;
Tejun Heo540eed52008-08-25 19:56:15 +0900394 struct disk_part_tbl *ptbl;
Tejun Heoed9e1982008-08-25 19:56:05 +0900395 const char *dname;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200396 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397
Tejun Heo540eed52008-08-25 19:56:15 +0900398 err = disk_expand_part_tbl(disk, partno);
399 if (err)
Tejun Heoba329292008-11-10 15:29:58 +0900400 return ERR_PTR(err);
Tejun Heo540eed52008-08-25 19:56:15 +0900401 ptbl = disk->part_tbl;
402
403 if (ptbl->part[partno])
Tejun Heoba329292008-11-10 15:29:58 +0900404 return ERR_PTR(-EBUSY);
Tejun Heo88e34122008-08-25 19:30:16 +0900405
Yoann Padioleaudd00cc42007-07-19 01:49:03 -0700406 p = kzalloc(sizeof(*p), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 if (!p)
Tejun Heoba329292008-11-10 15:29:58 +0900408 return ERR_PTR(-EBUSY);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200409
Jerome Marchand6f2576a2008-02-08 11:04:35 +0100410 if (!init_part_stats(p)) {
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700411 err = -ENOMEM;
Tejun Heo88e34122008-08-25 19:30:16 +0900412 goto out_free;
Jerome Marchand6f2576a2008-02-08 11:04:35 +0100413 }
Tejun Heoed9e1982008-08-25 19:56:05 +0900414 pdev = part_to_dev(p);
415
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 p->start_sect = start;
Martin K. Petersene03a72e2010-01-11 03:21:51 -0500417 p->alignment_offset =
418 queue_limit_alignment_offset(&disk->queue->limits, start);
419 p->discard_alignment =
420 queue_limit_discard_alignment(&disk->queue->limits, start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 p->nr_sects = len;
Tejun Heocf771cb2008-09-03 09:01:09 +0200422 p->partno = partno;
Tejun Heob7db9952008-08-25 19:56:10 +0900423 p->policy = get_disk_ro(disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424
Tejun Heoed9e1982008-08-25 19:56:05 +0900425 dname = dev_name(ddev);
426 if (isdigit(dname[strlen(dname) - 1]))
Kay Sievers3ada8b72009-01-06 10:44:43 -0800427 dev_set_name(pdev, "%sp%d", dname, partno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 else
Kay Sievers3ada8b72009-01-06 10:44:43 -0800429 dev_set_name(pdev, "%s%d", dname, partno);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200430
Tejun Heoed9e1982008-08-25 19:56:05 +0900431 device_initialize(pdev);
432 pdev->class = &block_class;
433 pdev->type = &part_type;
434 pdev->parent = ddev;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200435
Tejun Heobcce3de2008-08-25 19:47:22 +0900436 err = blk_alloc_devt(p, &devt);
437 if (err)
Tejun Heoeb60fa12008-11-10 15:28:59 +0900438 goto out_free_stats;
Tejun Heoed9e1982008-08-25 19:56:05 +0900439 pdev->devt = devt;
Tejun Heobcce3de2008-08-25 19:47:22 +0900440
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200441 /* delay uevent until 'holders' subdir is created */
Ming Leif67f1292009-03-01 21:10:49 +0800442 dev_set_uevent_suppress(pdev, 1);
Tejun Heoed9e1982008-08-25 19:56:05 +0900443 err = device_add(pdev);
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700444 if (err)
Tejun Heo88e34122008-08-25 19:30:16 +0900445 goto out_put;
446
447 err = -ENOMEM;
Tejun Heoed9e1982008-08-25 19:56:05 +0900448 p->holder_dir = kobject_create_and_add("holders", &pdev->kobj);
Tejun Heo88e34122008-08-25 19:30:16 +0900449 if (!p->holder_dir)
450 goto out_del;
451
Ming Leif67f1292009-03-01 21:10:49 +0800452 dev_set_uevent_suppress(pdev, 0);
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700453 if (flags & ADDPART_FLAG_WHOLEDISK) {
Tejun Heoed9e1982008-08-25 19:56:05 +0900454 err = device_create_file(pdev, &dev_attr_whole_disk);
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700455 if (err)
Tejun Heo88e34122008-08-25 19:30:16 +0900456 goto out_del;
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700457 }
Jeff Garzikeee44cc2006-10-17 00:10:23 -0700458
Tejun Heo88e34122008-08-25 19:30:16 +0900459 /* everything is up and running, commence */
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200460 INIT_RCU_HEAD(&p->rcu_head);
Tejun Heo540eed52008-08-25 19:56:15 +0900461 rcu_assign_pointer(ptbl->part[partno], p);
Tejun Heo88e34122008-08-25 19:30:16 +0900462
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200463 /* suppress uevent if the disk supresses it */
Heiko Carstensf8c73c72009-06-11 15:14:40 +0200464 if (!dev_get_uevent_suppress(ddev))
Tejun Heoed9e1982008-08-25 19:56:05 +0900465 kobject_uevent(&pdev->kobj, KOBJ_ADD);
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700466
Tejun Heoba329292008-11-10 15:29:58 +0900467 return p;
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700468
Tejun Heoeb60fa12008-11-10 15:28:59 +0900469out_free_stats:
470 free_part_stats(p);
Tejun Heo88e34122008-08-25 19:30:16 +0900471out_free:
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700472 kfree(p);
Tejun Heoba329292008-11-10 15:29:58 +0900473 return ERR_PTR(err);
Tejun Heo88e34122008-08-25 19:30:16 +0900474out_del:
475 kobject_put(p->holder_dir);
Tejun Heoed9e1982008-08-25 19:56:05 +0900476 device_del(pdev);
Tejun Heo88e34122008-08-25 19:30:16 +0900477out_put:
Tejun Heoed9e1982008-08-25 19:56:05 +0900478 put_device(pdev);
Tejun Heobcce3de2008-08-25 19:47:22 +0900479 blk_free_devt(devt);
Tejun Heoba329292008-11-10 15:29:58 +0900480 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481}
482
483/* Not exported, helper to add_disk(). */
484void register_disk(struct gendisk *disk)
485{
Tejun Heoed9e1982008-08-25 19:56:05 +0900486 struct device *ddev = disk_to_dev(disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 struct block_device *bdev;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200488 struct disk_part_iter piter;
489 struct hd_struct *part;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 int err;
491
Tejun Heoed9e1982008-08-25 19:56:05 +0900492 ddev->parent = disk->driverfs_dev;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200493
Kay Sievers3ada8b72009-01-06 10:44:43 -0800494 dev_set_name(ddev, disk->disk_name);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200495
496 /* delay uevents, until we scanned partition table */
Ming Leif67f1292009-03-01 21:10:49 +0800497 dev_set_uevent_suppress(ddev, 1);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200498
Tejun Heoed9e1982008-08-25 19:56:05 +0900499 if (device_add(ddev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 return;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200501#ifndef CONFIG_SYSFS_DEPRECATED
Tejun Heoed9e1982008-08-25 19:56:05 +0900502 err = sysfs_create_link(block_depr, &ddev->kobj,
503 kobject_name(&ddev->kobj));
Jeff Garzikeee44cc2006-10-17 00:10:23 -0700504 if (err) {
Tejun Heoed9e1982008-08-25 19:56:05 +0900505 device_del(ddev);
Jeff Garzikeee44cc2006-10-17 00:10:23 -0700506 return;
507 }
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200508#endif
Tejun Heo4c465012008-08-25 19:56:11 +0900509 disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj);
510 disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511
512 /* No minors to use for partitions */
Tejun Heob5d0b9d2008-09-03 09:06:42 +0200513 if (!disk_partitionable(disk))
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100514 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515
516 /* No such device (e.g., media were just removed) */
517 if (!get_capacity(disk))
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100518 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519
520 bdev = bdget_disk(disk, 0);
521 if (!bdev)
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100522 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523
524 bdev->bd_invalidated = 1;
Al Viro572c4892007-10-08 13:24:05 -0400525 err = blkdev_get(bdev, FMODE_READ);
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100526 if (err < 0)
527 goto exit;
Al Viro9a1c3542008-02-22 20:40:24 -0500528 blkdev_put(bdev, FMODE_READ);
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100529
530exit:
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200531 /* announce disk after possible partitions are created */
Ming Leif67f1292009-03-01 21:10:49 +0800532 dev_set_uevent_suppress(ddev, 0);
Tejun Heoed9e1982008-08-25 19:56:05 +0900533 kobject_uevent(&ddev->kobj, KOBJ_ADD);
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100534
535 /* announce possible partitions */
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200536 disk_part_iter_init(&piter, disk, 0);
537 while ((part = disk_part_iter_next(&piter)))
Tejun Heoed9e1982008-08-25 19:56:05 +0900538 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD);
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200539 disk_part_iter_exit(&piter);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540}
541
542int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
543{
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200544 struct disk_part_iter piter;
545 struct hd_struct *part;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 struct parsed_partitions *state;
Tejun Heo540eed52008-08-25 19:56:15 +0900547 int p, highest, res;
Tejun Heo56bca012010-05-15 20:09:28 +0200548rescan:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 if (bdev->bd_part_count)
550 return -EBUSY;
551 res = invalidate_partition(disk, 0);
552 if (res)
553 return res;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200554
555 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
556 while ((part = disk_part_iter_next(&piter)))
557 delete_partition(disk, part->partno);
558 disk_part_iter_exit(&piter);
559
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 if (disk->fops->revalidate_disk)
561 disk->fops->revalidate_disk(disk);
Andrew Patterson9bc3ffb2008-09-04 14:27:30 -0600562 check_disk_size_change(disk, bdev);
563 bdev->bd_invalidated = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
565 return 0;
Suzuki Kp5127d002006-12-06 20:35:14 -0800566 if (IS_ERR(state)) /* I/O error reading the partition table */
suzukib74a2f02007-03-16 13:38:25 -0800567 return -EIO;
Kay Sievers6bcf19d2008-03-09 21:26:02 +0100568
569 /* tell userspace that the media / partition table may have changed */
Tejun Heoed9e1982008-08-25 19:56:05 +0900570 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
Kay Sievers6bcf19d2008-03-09 21:26:02 +0100571
Tejun Heo540eed52008-08-25 19:56:15 +0900572 /* Detect the highest partition number and preallocate
573 * disk->part_tbl. This is an optimization and not strictly
574 * necessary.
575 */
576 for (p = 1, highest = 0; p < state->limit; p++)
577 if (state->parts[p].size)
578 highest = p;
579
580 disk_expand_part_tbl(disk, highest);
581
582 /* add partitions */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 for (p = 1; p < state->limit; p++) {
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200584 sector_t size, from;
Tejun Heo56bca012010-05-15 20:09:28 +0200585
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200586 size = state->parts[p].size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 if (!size)
588 continue;
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200589
590 from = state->parts[p].from;
Kay Sieversac0d86f2008-10-15 22:04:21 -0700591 if (from >= get_capacity(disk)) {
Andrew Morton8d99f832008-09-13 02:33:25 -0700592 printk(KERN_WARNING
Kay Sieversac0d86f2008-10-15 22:04:21 -0700593 "%s: p%d ignored, start %llu is behind the end of the disk\n",
594 disk->disk_name, p, (unsigned long long) from);
595 continue;
596 }
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200597
Kay Sieversac0d86f2008-10-15 22:04:21 -0700598 if (from + size > get_capacity(disk)) {
Alexey Dobriyan83d5cde2009-09-21 17:01:13 -0700599 const struct block_device_operations *bdops = disk->fops;
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200600
Kay Sieversac0d86f2008-10-15 22:04:21 -0700601 printk(KERN_WARNING
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200602 "%s: p%d size %llu exceeds device capacity, ",
Kay Sieversac0d86f2008-10-15 22:04:21 -0700603 disk->disk_name, p, (unsigned long long) size);
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200604
Tejun Heoc3e33e02010-05-15 20:09:29 +0200605 if (bdops->unlock_native_capacity &&
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200606 (disk->flags & GENHD_FL_NATIVE_CAPACITY) == 0) {
607 printk(KERN_CONT "enabling native capacity\n");
Tejun Heoc3e33e02010-05-15 20:09:29 +0200608 bdops->unlock_native_capacity(disk);
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200609 disk->flags |= GENHD_FL_NATIVE_CAPACITY;
Tejun Heo56bca012010-05-15 20:09:28 +0200610 /* free state and restart */
611 kfree(state);
612 goto rescan;
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200613 } else {
614 /*
615 * we can not ignore partitions of broken tables
616 * created by for example camera firmware, but
617 * we limit them to the end of the disk to avoid
618 * creating invalid block devices
619 */
620 printk(KERN_CONT "limited to end of disk\n");
621 size = get_capacity(disk) - from;
622 }
Mike Miller98bd34e2006-06-23 02:06:07 -0700623 }
Tejun Heoba329292008-11-10 15:29:58 +0900624 part = add_partition(disk, p, from, size,
625 state->parts[p].flags);
626 if (IS_ERR(part)) {
627 printk(KERN_ERR " %s: p%d could not be added: %ld\n",
628 disk->disk_name, p, -PTR_ERR(part));
Abdel Benamrouche04ebd4a2008-07-25 01:48:26 -0700629 continue;
630 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631#ifdef CONFIG_BLK_DEV_MD
Fabio Massimo Di Nittod18d7682007-02-10 23:50:00 -0800632 if (state->parts[p].flags & ADDPART_FLAG_RAID)
Tejun Heo55e8e302008-11-10 15:30:47 +0900633 md_autodetect_dev(part_to_dev(part)->devt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634#endif
635 }
636 kfree(state);
637 return 0;
638}
639
640unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
641{
642 struct address_space *mapping = bdev->bd_inode->i_mapping;
643 struct page *page;
644
Pekka Enberg090d2b12006-06-23 02:05:08 -0700645 page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
646 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 if (!IS_ERR(page)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 if (PageError(page))
649 goto fail;
650 p->v = page;
651 return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9);
652fail:
653 page_cache_release(page);
654 }
655 p->v = NULL;
656 return NULL;
657}
658
659EXPORT_SYMBOL(read_dev_sector);
660
661void del_gendisk(struct gendisk *disk)
662{
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200663 struct disk_part_iter piter;
664 struct hd_struct *part;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665
666 /* invalidate stuff */
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200667 disk_part_iter_init(&piter, disk,
668 DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE);
669 while ((part = disk_part_iter_next(&piter))) {
670 invalidate_partition(disk, part->partno);
671 delete_partition(disk, part->partno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 }
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200673 disk_part_iter_exit(&piter);
674
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 invalidate_partition(disk, 0);
Tejun Heo3e1a7ff2008-08-25 19:56:17 +0900676 blk_free_devt(disk_to_dev(disk)->devt);
Tejun Heo80795ae2008-08-25 19:56:07 +0900677 set_capacity(disk, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 disk->flags &= ~GENHD_FL_UP;
679 unlink_gendisk(disk);
Tejun Heo074a7ac2008-08-25 19:56:14 +0900680 part_stat_set_all(&disk->part0, 0);
681 disk->part0.stamp = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682
Tejun Heo4c465012008-08-25 19:56:11 +0900683 kobject_put(disk->part0.holder_dir);
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -0800684 kobject_put(disk->slave_dir);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200685 disk->driverfs_dev = NULL;
686#ifndef CONFIG_SYSFS_DEPRECATED
Tejun Heoed9e1982008-08-25 19:56:05 +0900687 sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk)));
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200688#endif
Tejun Heoed9e1982008-08-25 19:56:05 +0900689 device_del(disk_to_dev(disk));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690}