blob: 1a9c7878f8649b1df14531f66aa247fd2587e2c8 [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>
19#include <linux/kmod.h>
20#include <linux/ctype.h>
Jerome Marchand6f2576a2008-02-08 11:04:35 +010021#include <linux/genhd.h>
Arnaldo Carvalho de Melo157f9c02009-01-26 15:00:56 -020022#include <linux/blktrace_api.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
24#include "check.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
26#include "acorn.h"
27#include "amiga.h"
28#include "atari.h"
29#include "ldm.h"
30#include "mac.h"
31#include "msdos.h"
32#include "osf.h"
33#include "sgi.h"
34#include "sun.h"
35#include "ibm.h"
36#include "ultrix.h"
37#include "efi.h"
Bob Copeland0e6e1db2006-01-16 22:14:20 -080038#include "karma.h"
Philippe De Muyter19d0e8c2007-05-08 00:29:15 -070039#include "sysv68.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41#ifdef CONFIG_BLK_DEV_MD
42extern void md_autodetect_dev(dev_t dev);
43#endif
44
45int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/
46
47static int (*check_part[])(struct parsed_partitions *, struct block_device *) = {
48 /*
49 * Probe partition formats with tables at disk address 0
50 * that also have an ADFS boot block at 0xdc0.
51 */
52#ifdef CONFIG_ACORN_PARTITION_ICS
53 adfspart_check_ICS,
54#endif
55#ifdef CONFIG_ACORN_PARTITION_POWERTEC
56 adfspart_check_POWERTEC,
57#endif
58#ifdef CONFIG_ACORN_PARTITION_EESOX
59 adfspart_check_EESOX,
60#endif
61
62 /*
63 * Now move on to formats that only have partition info at
64 * disk address 0xdc0. Since these may also have stale
65 * PC/BIOS partition tables, they need to come before
66 * the msdos entry.
67 */
68#ifdef CONFIG_ACORN_PARTITION_CUMANA
69 adfspart_check_CUMANA,
70#endif
71#ifdef CONFIG_ACORN_PARTITION_ADFS
72 adfspart_check_ADFS,
73#endif
74
75#ifdef CONFIG_EFI_PARTITION
76 efi_partition, /* this must come before msdos */
77#endif
78#ifdef CONFIG_SGI_PARTITION
79 sgi_partition,
80#endif
81#ifdef CONFIG_LDM_PARTITION
82 ldm_partition, /* this must come before msdos */
83#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070084#ifdef CONFIG_MSDOS_PARTITION
85 msdos_partition,
86#endif
87#ifdef CONFIG_OSF_PARTITION
88 osf_partition,
89#endif
90#ifdef CONFIG_SUN_PARTITION
91 sun_partition,
92#endif
93#ifdef CONFIG_AMIGA_PARTITION
94 amiga_partition,
95#endif
96#ifdef CONFIG_ATARI_PARTITION
97 atari_partition,
98#endif
99#ifdef CONFIG_MAC_PARTITION
100 mac_partition,
101#endif
102#ifdef CONFIG_ULTRIX_PARTITION
103 ultrix_partition,
104#endif
105#ifdef CONFIG_IBM_PARTITION
106 ibm_partition,
107#endif
Bob Copeland0e6e1db2006-01-16 22:14:20 -0800108#ifdef CONFIG_KARMA_PARTITION
109 karma_partition,
110#endif
Philippe De Muyter19d0e8c2007-05-08 00:29:15 -0700111#ifdef CONFIG_SYSV68_PARTITION
112 sysv68_partition,
113#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 NULL
115};
116
117/*
118 * disk_name() is used by partition check code and the genhd driver.
119 * It formats the devicename of the indicated disk into
120 * the supplied buffer (of size at least 32), and returns
121 * a pointer to that same buffer (for convenience).
122 */
123
Tejun Heocf771cb2008-09-03 09:01:09 +0200124char *disk_name(struct gendisk *hd, int partno, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125{
Tejun Heocf771cb2008-09-03 09:01:09 +0200126 if (!partno)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name);
128 else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1]))
Tejun Heocf771cb2008-09-03 09:01:09 +0200129 snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, partno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 else
Tejun Heocf771cb2008-09-03 09:01:09 +0200131 snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, partno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
133 return buf;
134}
135
136const char *bdevname(struct block_device *bdev, char *buf)
137{
Tejun Heo0762b8b2008-08-25 19:56:12 +0900138 return disk_name(bdev->bd_disk, bdev->bd_part->partno, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139}
140
141EXPORT_SYMBOL(bdevname);
142
143/*
144 * There's very little reason to use this, you should really
145 * have a struct block_device just about everywhere and use
146 * bdevname() instead.
147 */
148const char *__bdevname(dev_t dev, char *buffer)
149{
150 scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",
151 MAJOR(dev), MINOR(dev));
152 return buffer;
153}
154
155EXPORT_SYMBOL(__bdevname);
156
157static struct parsed_partitions *
158check_partition(struct gendisk *hd, struct block_device *bdev)
159{
160 struct parsed_partitions *state;
Suzuki K P57881dd2006-12-06 20:35:16 -0800161 int i, res, err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162
163 state = kmalloc(sizeof(struct parsed_partitions), GFP_KERNEL);
164 if (!state)
165 return NULL;
166
Greg Kroah-Hartmana2964182005-06-20 21:15:16 -0700167 disk_name(hd, 0, state->name);
168 printk(KERN_INFO " %s:", state->name);
169 if (isdigit(state->name[strlen(state->name)-1]))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 sprintf(state->name, "p");
Greg Kroah-Hartmana2964182005-06-20 21:15:16 -0700171
Tejun Heob5d0b9d2008-09-03 09:06:42 +0200172 state->limit = disk_max_parts(hd);
Suzuki K P57881dd2006-12-06 20:35:16 -0800173 i = res = err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 while (!res && check_part[i]) {
175 memset(&state->parts, 0, sizeof(state->parts));
176 res = check_part[i++](state, bdev);
Suzuki K P57881dd2006-12-06 20:35:16 -0800177 if (res < 0) {
178 /* We have hit an I/O error which we don't report now.
179 * But record it, and let the others do their job.
180 */
181 err = res;
182 res = 0;
183 }
184
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 }
186 if (res > 0)
187 return state;
suzuki9bebff62007-03-07 20:41:24 -0800188 if (err)
Suzuki K P57881dd2006-12-06 20:35:16 -0800189 /* The partition is unrecognized. So report I/O errors if there were any */
190 res = err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 if (!res)
192 printk(" unknown partition table\n");
193 else if (warn_no_part)
194 printk(" unable to read partition table\n");
195 kfree(state);
Suzuki Kp5127d002006-12-06 20:35:14 -0800196 return ERR_PTR(res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197}
198
Tejun Heo0fc71e32008-10-13 13:27:59 +0200199static ssize_t part_partition_show(struct device *dev,
200 struct device_attribute *attr, char *buf)
201{
202 struct hd_struct *p = dev_to_part(dev);
203
204 return sprintf(buf, "%d\n", p->partno);
205}
206
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200207static ssize_t part_start_show(struct device *dev,
208 struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209{
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200210 struct hd_struct *p = dev_to_part(dev);
Kay Sieversa7fd6702005-10-01 14:49:43 +0200211
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200212 return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213}
214
Tejun Heoe5610522008-08-25 19:56:09 +0900215ssize_t part_size_show(struct device *dev,
216 struct device_attribute *attr, char *buf)
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200217{
218 struct hd_struct *p = dev_to_part(dev);
219 return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects);
220}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
Martin K. Petersenc72758f2009-05-22 17:17:53 -0400222ssize_t part_alignment_offset_show(struct device *dev,
223 struct device_attribute *attr, char *buf)
224{
225 struct hd_struct *p = dev_to_part(dev);
226 return sprintf(buf, "%llu\n", (unsigned long long)p->alignment_offset);
227}
228
Tejun Heo074a7ac2008-08-25 19:56:14 +0900229ssize_t part_stat_show(struct device *dev,
230 struct device_attribute *attr, char *buf)
Kay Sieversa7fd6702005-10-01 14:49:43 +0200231{
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200232 struct hd_struct *p = dev_to_part(dev);
Tejun Heoc9959052008-08-25 19:47:21 +0900233 int cpu;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200234
Tejun Heo074a7ac2008-08-25 19:56:14 +0900235 cpu = part_stat_lock();
Tejun Heoc9959052008-08-25 19:47:21 +0900236 part_round_stats(cpu, p);
Tejun Heo074a7ac2008-08-25 19:56:14 +0900237 part_stat_unlock();
Jerome Marchand34e8bea2008-02-08 11:04:55 +0100238 return sprintf(buf,
239 "%8lu %8lu %8llu %8u "
240 "%8lu %8lu %8llu %8u "
241 "%8u %8u %8u"
242 "\n",
243 part_stat_read(p, ios[READ]),
244 part_stat_read(p, merges[READ]),
245 (unsigned long long)part_stat_read(p, sectors[READ]),
246 jiffies_to_msecs(part_stat_read(p, ticks[READ])),
247 part_stat_read(p, ios[WRITE]),
248 part_stat_read(p, merges[WRITE]),
249 (unsigned long long)part_stat_read(p, sectors[WRITE]),
250 jiffies_to_msecs(part_stat_read(p, ticks[WRITE])),
251 p->in_flight,
252 jiffies_to_msecs(part_stat_read(p, io_ticks)),
253 jiffies_to_msecs(part_stat_read(p, time_in_queue)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255
Akinobu Mitac17bb492006-12-08 02:39:46 -0800256#ifdef CONFIG_FAIL_MAKE_REQUEST
Tejun Heoeddb2e22008-08-25 19:56:13 +0900257ssize_t part_fail_show(struct device *dev,
258 struct device_attribute *attr, char *buf)
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200259{
260 struct hd_struct *p = dev_to_part(dev);
Akinobu Mitac17bb492006-12-08 02:39:46 -0800261
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200262 return sprintf(buf, "%d\n", p->make_it_fail);
263}
264
Tejun Heoeddb2e22008-08-25 19:56:13 +0900265ssize_t part_fail_store(struct device *dev,
266 struct device_attribute *attr,
267 const char *buf, size_t count)
Akinobu Mitac17bb492006-12-08 02:39:46 -0800268{
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200269 struct hd_struct *p = dev_to_part(dev);
Akinobu Mitac17bb492006-12-08 02:39:46 -0800270 int i;
271
272 if (count > 0 && sscanf(buf, "%d", &i) > 0)
273 p->make_it_fail = (i == 0) ? 0 : 1;
274
275 return count;
276}
Akinobu Mitac17bb492006-12-08 02:39:46 -0800277#endif
278
Tejun Heo0fc71e32008-10-13 13:27:59 +0200279static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200280static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL);
281static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
Martin K. Petersenc72758f2009-05-22 17:17:53 -0400282static DEVICE_ATTR(alignment_offset, S_IRUGO, part_alignment_offset_show, NULL);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200283static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
Akinobu Mitac17bb492006-12-08 02:39:46 -0800284#ifdef CONFIG_FAIL_MAKE_REQUEST
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200285static struct device_attribute dev_attr_fail =
286 __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store);
Akinobu Mitac17bb492006-12-08 02:39:46 -0800287#endif
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200288
289static struct attribute *part_attrs[] = {
Tejun Heo0fc71e32008-10-13 13:27:59 +0200290 &dev_attr_partition.attr,
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200291 &dev_attr_start.attr,
292 &dev_attr_size.attr,
Martin K. Petersenc72758f2009-05-22 17:17:53 -0400293 &dev_attr_alignment_offset.attr,
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200294 &dev_attr_stat.attr,
295#ifdef CONFIG_FAIL_MAKE_REQUEST
296 &dev_attr_fail.attr,
297#endif
298 NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299};
300
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200301static struct attribute_group part_attr_group = {
302 .attrs = part_attrs,
303};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200305static struct attribute_group *part_attr_groups[] = {
306 &part_attr_group,
Arnaldo Carvalho de Meloc71a8962009-01-23 12:06:27 -0200307#ifdef CONFIG_BLK_DEV_IO_TRACE
308 &blk_trace_attr_group,
309#endif
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200310 NULL
311};
312
313static void part_release(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314{
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200315 struct hd_struct *p = dev_to_part(dev);
Jerome Marchand6f2576a2008-02-08 11:04:35 +0100316 free_part_stats(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 kfree(p);
318}
319
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200320struct device_type part_type = {
321 .name = "partition",
322 .groups = part_attr_groups,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 .release = part_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324};
325
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200326static void delete_partition_rcu_cb(struct rcu_head *head)
327{
328 struct hd_struct *part = container_of(head, struct hd_struct, rcu_head);
329
330 part->start_sect = 0;
331 part->nr_sects = 0;
332 part_stat_set_all(part, 0);
Tejun Heoed9e1982008-08-25 19:56:05 +0900333 put_device(part_to_dev(part));
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200334}
335
Tejun Heocf771cb2008-09-03 09:01:09 +0200336void delete_partition(struct gendisk *disk, int partno)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337{
Tejun Heo540eed52008-08-25 19:56:15 +0900338 struct disk_part_tbl *ptbl = disk->part_tbl;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200339 struct hd_struct *part;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200340
Tejun Heo540eed52008-08-25 19:56:15 +0900341 if (partno >= ptbl->len)
342 return;
343
344 part = ptbl->part[partno];
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200345 if (!part)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 return;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200347
Tejun Heobcce3de2008-08-25 19:47:22 +0900348 blk_free_devt(part_devt(part));
Tejun Heo540eed52008-08-25 19:56:15 +0900349 rcu_assign_pointer(ptbl->part[partno], NULL);
Neil Brown54b0d122009-01-07 08:55:39 +0100350 rcu_assign_pointer(ptbl->last_lookup, NULL);
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200351 kobject_put(part->holder_dir);
Tejun Heoed9e1982008-08-25 19:56:05 +0900352 device_del(part_to_dev(part));
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200353
354 call_rcu(&part->rcu_head, delete_partition_rcu_cb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355}
356
Greg Kroah-Hartmanf4a00a22008-02-06 23:33:39 -0800357static ssize_t whole_disk_show(struct device *dev,
358 struct device_attribute *attr, char *buf)
359{
360 return 0;
361}
362static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH,
363 whole_disk_show, NULL);
364
Tejun Heoba329292008-11-10 15:29:58 +0900365struct hd_struct *add_partition(struct gendisk *disk, int partno,
366 sector_t start, sector_t len, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367{
368 struct hd_struct *p;
Tejun Heobcce3de2008-08-25 19:47:22 +0900369 dev_t devt = MKDEV(0, 0);
Tejun Heoed9e1982008-08-25 19:56:05 +0900370 struct device *ddev = disk_to_dev(disk);
371 struct device *pdev;
Tejun Heo540eed52008-08-25 19:56:15 +0900372 struct disk_part_tbl *ptbl;
Tejun Heoed9e1982008-08-25 19:56:05 +0900373 const char *dname;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200374 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375
Tejun Heo540eed52008-08-25 19:56:15 +0900376 err = disk_expand_part_tbl(disk, partno);
377 if (err)
Tejun Heoba329292008-11-10 15:29:58 +0900378 return ERR_PTR(err);
Tejun Heo540eed52008-08-25 19:56:15 +0900379 ptbl = disk->part_tbl;
380
381 if (ptbl->part[partno])
Tejun Heoba329292008-11-10 15:29:58 +0900382 return ERR_PTR(-EBUSY);
Tejun Heo88e34122008-08-25 19:30:16 +0900383
Yoann Padioleaudd00cc42007-07-19 01:49:03 -0700384 p = kzalloc(sizeof(*p), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 if (!p)
Tejun Heoba329292008-11-10 15:29:58 +0900386 return ERR_PTR(-EBUSY);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200387
Jerome Marchand6f2576a2008-02-08 11:04:35 +0100388 if (!init_part_stats(p)) {
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700389 err = -ENOMEM;
Tejun Heo88e34122008-08-25 19:30:16 +0900390 goto out_free;
Jerome Marchand6f2576a2008-02-08 11:04:35 +0100391 }
Tejun Heoed9e1982008-08-25 19:56:05 +0900392 pdev = part_to_dev(p);
393
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 p->start_sect = start;
Martin K. Petersenc72758f2009-05-22 17:17:53 -0400395 p->alignment_offset = queue_sector_alignment_offset(disk->queue, start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 p->nr_sects = len;
Tejun Heocf771cb2008-09-03 09:01:09 +0200397 p->partno = partno;
Tejun Heob7db9952008-08-25 19:56:10 +0900398 p->policy = get_disk_ro(disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399
Tejun Heoed9e1982008-08-25 19:56:05 +0900400 dname = dev_name(ddev);
401 if (isdigit(dname[strlen(dname) - 1]))
Kay Sievers3ada8b72009-01-06 10:44:43 -0800402 dev_set_name(pdev, "%sp%d", dname, partno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 else
Kay Sievers3ada8b72009-01-06 10:44:43 -0800404 dev_set_name(pdev, "%s%d", dname, partno);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200405
Tejun Heoed9e1982008-08-25 19:56:05 +0900406 device_initialize(pdev);
407 pdev->class = &block_class;
408 pdev->type = &part_type;
409 pdev->parent = ddev;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200410
Tejun Heobcce3de2008-08-25 19:47:22 +0900411 err = blk_alloc_devt(p, &devt);
412 if (err)
Tejun Heoeb60fa12008-11-10 15:28:59 +0900413 goto out_free_stats;
Tejun Heoed9e1982008-08-25 19:56:05 +0900414 pdev->devt = devt;
Tejun Heobcce3de2008-08-25 19:47:22 +0900415
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200416 /* delay uevent until 'holders' subdir is created */
Ming Leif67f1292009-03-01 21:10:49 +0800417 dev_set_uevent_suppress(pdev, 1);
Tejun Heoed9e1982008-08-25 19:56:05 +0900418 err = device_add(pdev);
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700419 if (err)
Tejun Heo88e34122008-08-25 19:30:16 +0900420 goto out_put;
421
422 err = -ENOMEM;
Tejun Heoed9e1982008-08-25 19:56:05 +0900423 p->holder_dir = kobject_create_and_add("holders", &pdev->kobj);
Tejun Heo88e34122008-08-25 19:30:16 +0900424 if (!p->holder_dir)
425 goto out_del;
426
Ming Leif67f1292009-03-01 21:10:49 +0800427 dev_set_uevent_suppress(pdev, 0);
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700428 if (flags & ADDPART_FLAG_WHOLEDISK) {
Tejun Heoed9e1982008-08-25 19:56:05 +0900429 err = device_create_file(pdev, &dev_attr_whole_disk);
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700430 if (err)
Tejun Heo88e34122008-08-25 19:30:16 +0900431 goto out_del;
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700432 }
Jeff Garzikeee44cc2006-10-17 00:10:23 -0700433
Tejun Heo88e34122008-08-25 19:30:16 +0900434 /* everything is up and running, commence */
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200435 INIT_RCU_HEAD(&p->rcu_head);
Tejun Heo540eed52008-08-25 19:56:15 +0900436 rcu_assign_pointer(ptbl->part[partno], p);
Tejun Heo88e34122008-08-25 19:30:16 +0900437
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200438 /* suppress uevent if the disk supresses it */
Ming Leif67f1292009-03-01 21:10:49 +0800439 if (!dev_get_uevent_suppress(pdev))
Tejun Heoed9e1982008-08-25 19:56:05 +0900440 kobject_uevent(&pdev->kobj, KOBJ_ADD);
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700441
Tejun Heoba329292008-11-10 15:29:58 +0900442 return p;
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700443
Tejun Heoeb60fa12008-11-10 15:28:59 +0900444out_free_stats:
445 free_part_stats(p);
Tejun Heo88e34122008-08-25 19:30:16 +0900446out_free:
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700447 kfree(p);
Tejun Heoba329292008-11-10 15:29:58 +0900448 return ERR_PTR(err);
Tejun Heo88e34122008-08-25 19:30:16 +0900449out_del:
450 kobject_put(p->holder_dir);
Tejun Heoed9e1982008-08-25 19:56:05 +0900451 device_del(pdev);
Tejun Heo88e34122008-08-25 19:30:16 +0900452out_put:
Tejun Heoed9e1982008-08-25 19:56:05 +0900453 put_device(pdev);
Tejun Heobcce3de2008-08-25 19:47:22 +0900454 blk_free_devt(devt);
Tejun Heoba329292008-11-10 15:29:58 +0900455 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456}
457
458/* Not exported, helper to add_disk(). */
459void register_disk(struct gendisk *disk)
460{
Tejun Heoed9e1982008-08-25 19:56:05 +0900461 struct device *ddev = disk_to_dev(disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 struct block_device *bdev;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200463 struct disk_part_iter piter;
464 struct hd_struct *part;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 int err;
466
Tejun Heoed9e1982008-08-25 19:56:05 +0900467 ddev->parent = disk->driverfs_dev;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200468
Kay Sievers3ada8b72009-01-06 10:44:43 -0800469 dev_set_name(ddev, disk->disk_name);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200470
471 /* delay uevents, until we scanned partition table */
Ming Leif67f1292009-03-01 21:10:49 +0800472 dev_set_uevent_suppress(ddev, 1);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200473
Tejun Heoed9e1982008-08-25 19:56:05 +0900474 if (device_add(ddev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 return;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200476#ifndef CONFIG_SYSFS_DEPRECATED
Tejun Heoed9e1982008-08-25 19:56:05 +0900477 err = sysfs_create_link(block_depr, &ddev->kobj,
478 kobject_name(&ddev->kobj));
Jeff Garzikeee44cc2006-10-17 00:10:23 -0700479 if (err) {
Tejun Heoed9e1982008-08-25 19:56:05 +0900480 device_del(ddev);
Jeff Garzikeee44cc2006-10-17 00:10:23 -0700481 return;
482 }
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200483#endif
Tejun Heo4c465012008-08-25 19:56:11 +0900484 disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj);
485 disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486
487 /* No minors to use for partitions */
Tejun Heob5d0b9d2008-09-03 09:06:42 +0200488 if (!disk_partitionable(disk))
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100489 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490
491 /* No such device (e.g., media were just removed) */
492 if (!get_capacity(disk))
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100493 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494
495 bdev = bdget_disk(disk, 0);
496 if (!bdev)
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100497 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498
499 bdev->bd_invalidated = 1;
Al Viro572c4892007-10-08 13:24:05 -0400500 err = blkdev_get(bdev, FMODE_READ);
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100501 if (err < 0)
502 goto exit;
Al Viro9a1c3542008-02-22 20:40:24 -0500503 blkdev_put(bdev, FMODE_READ);
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100504
505exit:
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200506 /* announce disk after possible partitions are created */
Ming Leif67f1292009-03-01 21:10:49 +0800507 dev_set_uevent_suppress(ddev, 0);
Tejun Heoed9e1982008-08-25 19:56:05 +0900508 kobject_uevent(&ddev->kobj, KOBJ_ADD);
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100509
510 /* announce possible partitions */
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200511 disk_part_iter_init(&piter, disk, 0);
512 while ((part = disk_part_iter_next(&piter)))
Tejun Heoed9e1982008-08-25 19:56:05 +0900513 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD);
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200514 disk_part_iter_exit(&piter);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515}
516
517int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
518{
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200519 struct disk_part_iter piter;
520 struct hd_struct *part;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 struct parsed_partitions *state;
Tejun Heo540eed52008-08-25 19:56:15 +0900522 int p, highest, res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523
524 if (bdev->bd_part_count)
525 return -EBUSY;
526 res = invalidate_partition(disk, 0);
527 if (res)
528 return res;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200529
530 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
531 while ((part = disk_part_iter_next(&piter)))
532 delete_partition(disk, part->partno);
533 disk_part_iter_exit(&piter);
534
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 if (disk->fops->revalidate_disk)
536 disk->fops->revalidate_disk(disk);
Andrew Patterson9bc3ffb2008-09-04 14:27:30 -0600537 check_disk_size_change(disk, bdev);
538 bdev->bd_invalidated = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
540 return 0;
Suzuki Kp5127d002006-12-06 20:35:14 -0800541 if (IS_ERR(state)) /* I/O error reading the partition table */
suzukib74a2f02007-03-16 13:38:25 -0800542 return -EIO;
Kay Sievers6bcf19d2008-03-09 21:26:02 +0100543
544 /* tell userspace that the media / partition table may have changed */
Tejun Heoed9e1982008-08-25 19:56:05 +0900545 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
Kay Sievers6bcf19d2008-03-09 21:26:02 +0100546
Tejun Heo540eed52008-08-25 19:56:15 +0900547 /* Detect the highest partition number and preallocate
548 * disk->part_tbl. This is an optimization and not strictly
549 * necessary.
550 */
551 for (p = 1, highest = 0; p < state->limit; p++)
552 if (state->parts[p].size)
553 highest = p;
554
555 disk_expand_part_tbl(disk, highest);
556
557 /* add partitions */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 for (p = 1; p < state->limit; p++) {
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200559 sector_t size, from;
560try_scan:
561 size = state->parts[p].size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 if (!size)
563 continue;
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200564
565 from = state->parts[p].from;
Kay Sieversac0d86f2008-10-15 22:04:21 -0700566 if (from >= get_capacity(disk)) {
Andrew Morton8d99f832008-09-13 02:33:25 -0700567 printk(KERN_WARNING
Kay Sieversac0d86f2008-10-15 22:04:21 -0700568 "%s: p%d ignored, start %llu is behind the end of the disk\n",
569 disk->disk_name, p, (unsigned long long) from);
570 continue;
571 }
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200572
Kay Sieversac0d86f2008-10-15 22:04:21 -0700573 if (from + size > get_capacity(disk)) {
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200574 struct block_device_operations *bdops = disk->fops;
575 unsigned long long capacity;
576
Kay Sieversac0d86f2008-10-15 22:04:21 -0700577 printk(KERN_WARNING
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200578 "%s: p%d size %llu exceeds device capacity, ",
Kay Sieversac0d86f2008-10-15 22:04:21 -0700579 disk->disk_name, p, (unsigned long long) size);
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200580
581 if (bdops->set_capacity &&
582 (disk->flags & GENHD_FL_NATIVE_CAPACITY) == 0) {
583 printk(KERN_CONT "enabling native capacity\n");
584 capacity = bdops->set_capacity(disk, ~0ULL);
585 disk->flags |= GENHD_FL_NATIVE_CAPACITY;
586 if (capacity > get_capacity(disk)) {
587 set_capacity(disk, capacity);
588 check_disk_size_change(disk, bdev);
589 bdev->bd_invalidated = 0;
590 }
591 goto try_scan;
592 } else {
593 /*
594 * we can not ignore partitions of broken tables
595 * created by for example camera firmware, but
596 * we limit them to the end of the disk to avoid
597 * creating invalid block devices
598 */
599 printk(KERN_CONT "limited to end of disk\n");
600 size = get_capacity(disk) - from;
601 }
Mike Miller98bd34e2006-06-23 02:06:07 -0700602 }
Tejun Heoba329292008-11-10 15:29:58 +0900603 part = add_partition(disk, p, from, size,
604 state->parts[p].flags);
605 if (IS_ERR(part)) {
606 printk(KERN_ERR " %s: p%d could not be added: %ld\n",
607 disk->disk_name, p, -PTR_ERR(part));
Abdel Benamrouche04ebd4a2008-07-25 01:48:26 -0700608 continue;
609 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610#ifdef CONFIG_BLK_DEV_MD
Fabio Massimo Di Nittod18d7682007-02-10 23:50:00 -0800611 if (state->parts[p].flags & ADDPART_FLAG_RAID)
Tejun Heo55e8e302008-11-10 15:30:47 +0900612 md_autodetect_dev(part_to_dev(part)->devt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613#endif
614 }
615 kfree(state);
616 return 0;
617}
618
619unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
620{
621 struct address_space *mapping = bdev->bd_inode->i_mapping;
622 struct page *page;
623
Pekka Enberg090d2b12006-06-23 02:05:08 -0700624 page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
625 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 if (!IS_ERR(page)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 if (PageError(page))
628 goto fail;
629 p->v = page;
630 return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9);
631fail:
632 page_cache_release(page);
633 }
634 p->v = NULL;
635 return NULL;
636}
637
638EXPORT_SYMBOL(read_dev_sector);
639
640void del_gendisk(struct gendisk *disk)
641{
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200642 struct disk_part_iter piter;
643 struct hd_struct *part;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644
645 /* invalidate stuff */
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200646 disk_part_iter_init(&piter, disk,
647 DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE);
648 while ((part = disk_part_iter_next(&piter))) {
649 invalidate_partition(disk, part->partno);
650 delete_partition(disk, part->partno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 }
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200652 disk_part_iter_exit(&piter);
653
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 invalidate_partition(disk, 0);
Tejun Heo3e1a7ff2008-08-25 19:56:17 +0900655 blk_free_devt(disk_to_dev(disk)->devt);
Tejun Heo80795ae2008-08-25 19:56:07 +0900656 set_capacity(disk, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 disk->flags &= ~GENHD_FL_UP;
658 unlink_gendisk(disk);
Tejun Heo074a7ac2008-08-25 19:56:14 +0900659 part_stat_set_all(&disk->part0, 0);
660 disk->part0.stamp = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661
Tejun Heo4c465012008-08-25 19:56:11 +0900662 kobject_put(disk->part0.holder_dir);
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -0800663 kobject_put(disk->slave_dir);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200664 disk->driverfs_dev = NULL;
665#ifndef CONFIG_SYSFS_DEPRECATED
Tejun Heoed9e1982008-08-25 19:56:05 +0900666 sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk)));
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200667#endif
Tejun Heoed9e1982008-08-25 19:56:05 +0900668 device_del(disk_to_dev(disk));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669}