blob: 6d720243f5f4a29a43a7b50dd005bbff32a7b0aa [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
23#include "check.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
25#include "acorn.h"
26#include "amiga.h"
27#include "atari.h"
28#include "ldm.h"
29#include "mac.h"
30#include "msdos.h"
31#include "osf.h"
32#include "sgi.h"
33#include "sun.h"
34#include "ibm.h"
35#include "ultrix.h"
36#include "efi.h"
Bob Copeland0e6e1db2006-01-16 22:14:20 -080037#include "karma.h"
Philippe De Muyter19d0e8c2007-05-08 00:29:15 -070038#include "sysv68.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
40#ifdef CONFIG_BLK_DEV_MD
41extern void md_autodetect_dev(dev_t dev);
42#endif
43
44int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/
45
46static int (*check_part[])(struct parsed_partitions *, struct block_device *) = {
47 /*
48 * Probe partition formats with tables at disk address 0
49 * that also have an ADFS boot block at 0xdc0.
50 */
51#ifdef CONFIG_ACORN_PARTITION_ICS
52 adfspart_check_ICS,
53#endif
54#ifdef CONFIG_ACORN_PARTITION_POWERTEC
55 adfspart_check_POWERTEC,
56#endif
57#ifdef CONFIG_ACORN_PARTITION_EESOX
58 adfspart_check_EESOX,
59#endif
60
61 /*
62 * Now move on to formats that only have partition info at
63 * disk address 0xdc0. Since these may also have stale
64 * PC/BIOS partition tables, they need to come before
65 * the msdos entry.
66 */
67#ifdef CONFIG_ACORN_PARTITION_CUMANA
68 adfspart_check_CUMANA,
69#endif
70#ifdef CONFIG_ACORN_PARTITION_ADFS
71 adfspart_check_ADFS,
72#endif
73
74#ifdef CONFIG_EFI_PARTITION
75 efi_partition, /* this must come before msdos */
76#endif
77#ifdef CONFIG_SGI_PARTITION
78 sgi_partition,
79#endif
80#ifdef CONFIG_LDM_PARTITION
81 ldm_partition, /* this must come before msdos */
82#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070083#ifdef CONFIG_MSDOS_PARTITION
84 msdos_partition,
85#endif
86#ifdef CONFIG_OSF_PARTITION
87 osf_partition,
88#endif
89#ifdef CONFIG_SUN_PARTITION
90 sun_partition,
91#endif
92#ifdef CONFIG_AMIGA_PARTITION
93 amiga_partition,
94#endif
95#ifdef CONFIG_ATARI_PARTITION
96 atari_partition,
97#endif
98#ifdef CONFIG_MAC_PARTITION
99 mac_partition,
100#endif
101#ifdef CONFIG_ULTRIX_PARTITION
102 ultrix_partition,
103#endif
104#ifdef CONFIG_IBM_PARTITION
105 ibm_partition,
106#endif
Bob Copeland0e6e1db2006-01-16 22:14:20 -0800107#ifdef CONFIG_KARMA_PARTITION
108 karma_partition,
109#endif
Philippe De Muyter19d0e8c2007-05-08 00:29:15 -0700110#ifdef CONFIG_SYSV68_PARTITION
111 sysv68_partition,
112#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 NULL
114};
115
116/*
117 * disk_name() is used by partition check code and the genhd driver.
118 * It formats the devicename of the indicated disk into
119 * the supplied buffer (of size at least 32), and returns
120 * a pointer to that same buffer (for convenience).
121 */
122
Tejun Heocf771cb2008-09-03 09:01:09 +0200123char *disk_name(struct gendisk *hd, int partno, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124{
Tejun Heocf771cb2008-09-03 09:01:09 +0200125 if (!partno)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name);
127 else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1]))
Tejun Heocf771cb2008-09-03 09:01:09 +0200128 snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, partno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 else
Tejun Heocf771cb2008-09-03 09:01:09 +0200130 snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, partno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
132 return buf;
133}
134
135const char *bdevname(struct block_device *bdev, char *buf)
136{
Tejun Heo0762b8b2008-08-25 19:56:12 +0900137 return disk_name(bdev->bd_disk, bdev->bd_part->partno, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138}
139
140EXPORT_SYMBOL(bdevname);
141
142/*
143 * There's very little reason to use this, you should really
144 * have a struct block_device just about everywhere and use
145 * bdevname() instead.
146 */
147const char *__bdevname(dev_t dev, char *buffer)
148{
149 scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",
150 MAJOR(dev), MINOR(dev));
151 return buffer;
152}
153
154EXPORT_SYMBOL(__bdevname);
155
156static struct parsed_partitions *
157check_partition(struct gendisk *hd, struct block_device *bdev)
158{
159 struct parsed_partitions *state;
Suzuki K P57881dd2006-12-06 20:35:16 -0800160 int i, res, err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
162 state = kmalloc(sizeof(struct parsed_partitions), GFP_KERNEL);
163 if (!state)
164 return NULL;
165
Greg Kroah-Hartmana2964182005-06-20 21:15:16 -0700166 disk_name(hd, 0, state->name);
167 printk(KERN_INFO " %s:", state->name);
168 if (isdigit(state->name[strlen(state->name)-1]))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 sprintf(state->name, "p");
Greg Kroah-Hartmana2964182005-06-20 21:15:16 -0700170
Tejun Heob5d0b9d2008-09-03 09:06:42 +0200171 state->limit = disk_max_parts(hd);
Suzuki K P57881dd2006-12-06 20:35:16 -0800172 i = res = err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 while (!res && check_part[i]) {
174 memset(&state->parts, 0, sizeof(state->parts));
175 res = check_part[i++](state, bdev);
Suzuki K P57881dd2006-12-06 20:35:16 -0800176 if (res < 0) {
177 /* We have hit an I/O error which we don't report now.
178 * But record it, and let the others do their job.
179 */
180 err = res;
181 res = 0;
182 }
183
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 }
185 if (res > 0)
186 return state;
suzuki9bebff62007-03-07 20:41:24 -0800187 if (err)
Suzuki K P57881dd2006-12-06 20:35:16 -0800188 /* The partition is unrecognized. So report I/O errors if there were any */
189 res = err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 if (!res)
191 printk(" unknown partition table\n");
192 else if (warn_no_part)
193 printk(" unable to read partition table\n");
194 kfree(state);
Suzuki Kp5127d002006-12-06 20:35:14 -0800195 return ERR_PTR(res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196}
197
Tejun Heo0fc71e32008-10-13 13:27:59 +0200198static ssize_t part_partition_show(struct device *dev,
199 struct device_attribute *attr, char *buf)
200{
201 struct hd_struct *p = dev_to_part(dev);
202
203 return sprintf(buf, "%d\n", p->partno);
204}
205
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200206static ssize_t part_start_show(struct device *dev,
207 struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208{
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200209 struct hd_struct *p = dev_to_part(dev);
Kay Sieversa7fd6702005-10-01 14:49:43 +0200210
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200211 return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212}
213
Tejun Heoe5610522008-08-25 19:56:09 +0900214ssize_t part_size_show(struct device *dev,
215 struct device_attribute *attr, char *buf)
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200216{
217 struct hd_struct *p = dev_to_part(dev);
218 return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects);
219}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220
Tejun Heo074a7ac2008-08-25 19:56:14 +0900221ssize_t part_stat_show(struct device *dev,
222 struct device_attribute *attr, char *buf)
Kay Sieversa7fd6702005-10-01 14:49:43 +0200223{
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200224 struct hd_struct *p = dev_to_part(dev);
Tejun Heoc9959052008-08-25 19:47:21 +0900225 int cpu;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200226
Tejun Heo074a7ac2008-08-25 19:56:14 +0900227 cpu = part_stat_lock();
Tejun Heoc9959052008-08-25 19:47:21 +0900228 part_round_stats(cpu, p);
Tejun Heo074a7ac2008-08-25 19:56:14 +0900229 part_stat_unlock();
Jerome Marchand34e8bea2008-02-08 11:04:55 +0100230 return sprintf(buf,
231 "%8lu %8lu %8llu %8u "
232 "%8lu %8lu %8llu %8u "
233 "%8u %8u %8u"
234 "\n",
235 part_stat_read(p, ios[READ]),
236 part_stat_read(p, merges[READ]),
237 (unsigned long long)part_stat_read(p, sectors[READ]),
238 jiffies_to_msecs(part_stat_read(p, ticks[READ])),
239 part_stat_read(p, ios[WRITE]),
240 part_stat_read(p, merges[WRITE]),
241 (unsigned long long)part_stat_read(p, sectors[WRITE]),
242 jiffies_to_msecs(part_stat_read(p, ticks[WRITE])),
243 p->in_flight,
244 jiffies_to_msecs(part_stat_read(p, io_ticks)),
245 jiffies_to_msecs(part_stat_read(p, time_in_queue)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247
Akinobu Mitac17bb492006-12-08 02:39:46 -0800248#ifdef CONFIG_FAIL_MAKE_REQUEST
Tejun Heoeddb2e22008-08-25 19:56:13 +0900249ssize_t part_fail_show(struct device *dev,
250 struct device_attribute *attr, char *buf)
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200251{
252 struct hd_struct *p = dev_to_part(dev);
Akinobu Mitac17bb492006-12-08 02:39:46 -0800253
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200254 return sprintf(buf, "%d\n", p->make_it_fail);
255}
256
Tejun Heoeddb2e22008-08-25 19:56:13 +0900257ssize_t part_fail_store(struct device *dev,
258 struct device_attribute *attr,
259 const char *buf, size_t count)
Akinobu Mitac17bb492006-12-08 02:39:46 -0800260{
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200261 struct hd_struct *p = dev_to_part(dev);
Akinobu Mitac17bb492006-12-08 02:39:46 -0800262 int i;
263
264 if (count > 0 && sscanf(buf, "%d", &i) > 0)
265 p->make_it_fail = (i == 0) ? 0 : 1;
266
267 return count;
268}
Akinobu Mitac17bb492006-12-08 02:39:46 -0800269#endif
270
Tejun Heo0fc71e32008-10-13 13:27:59 +0200271static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200272static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL);
273static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
274static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
Akinobu Mitac17bb492006-12-08 02:39:46 -0800275#ifdef CONFIG_FAIL_MAKE_REQUEST
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200276static struct device_attribute dev_attr_fail =
277 __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store);
Akinobu Mitac17bb492006-12-08 02:39:46 -0800278#endif
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200279
280static struct attribute *part_attrs[] = {
Tejun Heo0fc71e32008-10-13 13:27:59 +0200281 &dev_attr_partition.attr,
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200282 &dev_attr_start.attr,
283 &dev_attr_size.attr,
284 &dev_attr_stat.attr,
285#ifdef CONFIG_FAIL_MAKE_REQUEST
286 &dev_attr_fail.attr,
287#endif
288 NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289};
290
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200291static struct attribute_group part_attr_group = {
292 .attrs = part_attrs,
293};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200295static struct attribute_group *part_attr_groups[] = {
296 &part_attr_group,
297 NULL
298};
299
300static void part_release(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301{
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200302 struct hd_struct *p = dev_to_part(dev);
Jerome Marchand6f2576a2008-02-08 11:04:35 +0100303 free_part_stats(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 kfree(p);
305}
306
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200307struct device_type part_type = {
308 .name = "partition",
309 .groups = part_attr_groups,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 .release = part_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311};
312
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200313static void delete_partition_rcu_cb(struct rcu_head *head)
314{
315 struct hd_struct *part = container_of(head, struct hd_struct, rcu_head);
316
317 part->start_sect = 0;
318 part->nr_sects = 0;
319 part_stat_set_all(part, 0);
Tejun Heoed9e1982008-08-25 19:56:05 +0900320 put_device(part_to_dev(part));
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200321}
322
Tejun Heocf771cb2008-09-03 09:01:09 +0200323void delete_partition(struct gendisk *disk, int partno)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324{
Tejun Heo540eed52008-08-25 19:56:15 +0900325 struct disk_part_tbl *ptbl = disk->part_tbl;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200326 struct hd_struct *part;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200327
Tejun Heo540eed52008-08-25 19:56:15 +0900328 if (partno >= ptbl->len)
329 return;
330
331 part = ptbl->part[partno];
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200332 if (!part)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 return;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200334
Tejun Heobcce3de2008-08-25 19:47:22 +0900335 blk_free_devt(part_devt(part));
Tejun Heo540eed52008-08-25 19:56:15 +0900336 rcu_assign_pointer(ptbl->part[partno], NULL);
Neil Brown54b0d122009-01-07 08:55:39 +0100337 rcu_assign_pointer(ptbl->last_lookup, NULL);
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200338 kobject_put(part->holder_dir);
Tejun Heoed9e1982008-08-25 19:56:05 +0900339 device_del(part_to_dev(part));
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200340
341 call_rcu(&part->rcu_head, delete_partition_rcu_cb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342}
343
Greg Kroah-Hartmanf4a00a22008-02-06 23:33:39 -0800344static ssize_t whole_disk_show(struct device *dev,
345 struct device_attribute *attr, char *buf)
346{
347 return 0;
348}
349static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH,
350 whole_disk_show, NULL);
351
Tejun Heoba329292008-11-10 15:29:58 +0900352struct hd_struct *add_partition(struct gendisk *disk, int partno,
353 sector_t start, sector_t len, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354{
355 struct hd_struct *p;
Tejun Heobcce3de2008-08-25 19:47:22 +0900356 dev_t devt = MKDEV(0, 0);
Tejun Heoed9e1982008-08-25 19:56:05 +0900357 struct device *ddev = disk_to_dev(disk);
358 struct device *pdev;
Tejun Heo540eed52008-08-25 19:56:15 +0900359 struct disk_part_tbl *ptbl;
Tejun Heoed9e1982008-08-25 19:56:05 +0900360 const char *dname;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200361 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362
Tejun Heo540eed52008-08-25 19:56:15 +0900363 err = disk_expand_part_tbl(disk, partno);
364 if (err)
Tejun Heoba329292008-11-10 15:29:58 +0900365 return ERR_PTR(err);
Tejun Heo540eed52008-08-25 19:56:15 +0900366 ptbl = disk->part_tbl;
367
368 if (ptbl->part[partno])
Tejun Heoba329292008-11-10 15:29:58 +0900369 return ERR_PTR(-EBUSY);
Tejun Heo88e34122008-08-25 19:30:16 +0900370
Yoann Padioleaudd00cc42007-07-19 01:49:03 -0700371 p = kzalloc(sizeof(*p), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 if (!p)
Tejun Heoba329292008-11-10 15:29:58 +0900373 return ERR_PTR(-EBUSY);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200374
Jerome Marchand6f2576a2008-02-08 11:04:35 +0100375 if (!init_part_stats(p)) {
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700376 err = -ENOMEM;
Tejun Heo88e34122008-08-25 19:30:16 +0900377 goto out_free;
Jerome Marchand6f2576a2008-02-08 11:04:35 +0100378 }
Tejun Heoed9e1982008-08-25 19:56:05 +0900379 pdev = part_to_dev(p);
380
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 p->start_sect = start;
382 p->nr_sects = len;
Tejun Heocf771cb2008-09-03 09:01:09 +0200383 p->partno = partno;
Tejun Heob7db9952008-08-25 19:56:10 +0900384 p->policy = get_disk_ro(disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385
Tejun Heoed9e1982008-08-25 19:56:05 +0900386 dname = dev_name(ddev);
387 if (isdigit(dname[strlen(dname) - 1]))
Kay Sievers3ada8b72009-01-06 10:44:43 -0800388 dev_set_name(pdev, "%sp%d", dname, partno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 else
Kay Sievers3ada8b72009-01-06 10:44:43 -0800390 dev_set_name(pdev, "%s%d", dname, partno);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200391
Tejun Heoed9e1982008-08-25 19:56:05 +0900392 device_initialize(pdev);
393 pdev->class = &block_class;
394 pdev->type = &part_type;
395 pdev->parent = ddev;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200396
Tejun Heobcce3de2008-08-25 19:47:22 +0900397 err = blk_alloc_devt(p, &devt);
398 if (err)
Tejun Heoeb60fa12008-11-10 15:28:59 +0900399 goto out_free_stats;
Tejun Heoed9e1982008-08-25 19:56:05 +0900400 pdev->devt = devt;
Tejun Heobcce3de2008-08-25 19:47:22 +0900401
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200402 /* delay uevent until 'holders' subdir is created */
Tejun Heoed9e1982008-08-25 19:56:05 +0900403 pdev->uevent_suppress = 1;
404 err = device_add(pdev);
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700405 if (err)
Tejun Heo88e34122008-08-25 19:30:16 +0900406 goto out_put;
407
408 err = -ENOMEM;
Tejun Heoed9e1982008-08-25 19:56:05 +0900409 p->holder_dir = kobject_create_and_add("holders", &pdev->kobj);
Tejun Heo88e34122008-08-25 19:30:16 +0900410 if (!p->holder_dir)
411 goto out_del;
412
Tejun Heoed9e1982008-08-25 19:56:05 +0900413 pdev->uevent_suppress = 0;
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700414 if (flags & ADDPART_FLAG_WHOLEDISK) {
Tejun Heoed9e1982008-08-25 19:56:05 +0900415 err = device_create_file(pdev, &dev_attr_whole_disk);
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700416 if (err)
Tejun Heo88e34122008-08-25 19:30:16 +0900417 goto out_del;
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700418 }
Jeff Garzikeee44cc2006-10-17 00:10:23 -0700419
Tejun Heo88e34122008-08-25 19:30:16 +0900420 /* everything is up and running, commence */
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200421 INIT_RCU_HEAD(&p->rcu_head);
Tejun Heo540eed52008-08-25 19:56:15 +0900422 rcu_assign_pointer(ptbl->part[partno], p);
Tejun Heo88e34122008-08-25 19:30:16 +0900423
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200424 /* suppress uevent if the disk supresses it */
Tejun Heoed9e1982008-08-25 19:56:05 +0900425 if (!ddev->uevent_suppress)
426 kobject_uevent(&pdev->kobj, KOBJ_ADD);
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700427
Tejun Heoba329292008-11-10 15:29:58 +0900428 return p;
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700429
Tejun Heoeb60fa12008-11-10 15:28:59 +0900430out_free_stats:
431 free_part_stats(p);
Tejun Heo88e34122008-08-25 19:30:16 +0900432out_free:
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700433 kfree(p);
Tejun Heoba329292008-11-10 15:29:58 +0900434 return ERR_PTR(err);
Tejun Heo88e34122008-08-25 19:30:16 +0900435out_del:
436 kobject_put(p->holder_dir);
Tejun Heoed9e1982008-08-25 19:56:05 +0900437 device_del(pdev);
Tejun Heo88e34122008-08-25 19:30:16 +0900438out_put:
Tejun Heoed9e1982008-08-25 19:56:05 +0900439 put_device(pdev);
Tejun Heobcce3de2008-08-25 19:47:22 +0900440 blk_free_devt(devt);
Tejun Heoba329292008-11-10 15:29:58 +0900441 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442}
443
444/* Not exported, helper to add_disk(). */
445void register_disk(struct gendisk *disk)
446{
Tejun Heoed9e1982008-08-25 19:56:05 +0900447 struct device *ddev = disk_to_dev(disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 struct block_device *bdev;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200449 struct disk_part_iter piter;
450 struct hd_struct *part;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 int err;
452
Tejun Heoed9e1982008-08-25 19:56:05 +0900453 ddev->parent = disk->driverfs_dev;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200454
Kay Sievers3ada8b72009-01-06 10:44:43 -0800455 dev_set_name(ddev, disk->disk_name);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200456
457 /* delay uevents, until we scanned partition table */
Tejun Heoed9e1982008-08-25 19:56:05 +0900458 ddev->uevent_suppress = 1;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200459
Tejun Heoed9e1982008-08-25 19:56:05 +0900460 if (device_add(ddev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 return;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200462#ifndef CONFIG_SYSFS_DEPRECATED
Tejun Heoed9e1982008-08-25 19:56:05 +0900463 err = sysfs_create_link(block_depr, &ddev->kobj,
464 kobject_name(&ddev->kobj));
Jeff Garzikeee44cc2006-10-17 00:10:23 -0700465 if (err) {
Tejun Heoed9e1982008-08-25 19:56:05 +0900466 device_del(ddev);
Jeff Garzikeee44cc2006-10-17 00:10:23 -0700467 return;
468 }
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200469#endif
Tejun Heo4c465012008-08-25 19:56:11 +0900470 disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj);
471 disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472
473 /* No minors to use for partitions */
Tejun Heob5d0b9d2008-09-03 09:06:42 +0200474 if (!disk_partitionable(disk))
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100475 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476
477 /* No such device (e.g., media were just removed) */
478 if (!get_capacity(disk))
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100479 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480
481 bdev = bdget_disk(disk, 0);
482 if (!bdev)
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100483 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484
485 bdev->bd_invalidated = 1;
Al Viro572c4892007-10-08 13:24:05 -0400486 err = blkdev_get(bdev, FMODE_READ);
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100487 if (err < 0)
488 goto exit;
Al Viro9a1c3542008-02-22 20:40:24 -0500489 blkdev_put(bdev, FMODE_READ);
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100490
491exit:
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200492 /* announce disk after possible partitions are created */
Tejun Heoed9e1982008-08-25 19:56:05 +0900493 ddev->uevent_suppress = 0;
494 kobject_uevent(&ddev->kobj, KOBJ_ADD);
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100495
496 /* announce possible partitions */
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200497 disk_part_iter_init(&piter, disk, 0);
498 while ((part = disk_part_iter_next(&piter)))
Tejun Heoed9e1982008-08-25 19:56:05 +0900499 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD);
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200500 disk_part_iter_exit(&piter);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501}
502
503int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
504{
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200505 struct disk_part_iter piter;
506 struct hd_struct *part;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 struct parsed_partitions *state;
Tejun Heo540eed52008-08-25 19:56:15 +0900508 int p, highest, res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509
510 if (bdev->bd_part_count)
511 return -EBUSY;
512 res = invalidate_partition(disk, 0);
513 if (res)
514 return res;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200515
516 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
517 while ((part = disk_part_iter_next(&piter)))
518 delete_partition(disk, part->partno);
519 disk_part_iter_exit(&piter);
520
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 if (disk->fops->revalidate_disk)
522 disk->fops->revalidate_disk(disk);
Andrew Patterson9bc3ffb2008-09-04 14:27:30 -0600523 check_disk_size_change(disk, bdev);
524 bdev->bd_invalidated = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
526 return 0;
Suzuki Kp5127d002006-12-06 20:35:14 -0800527 if (IS_ERR(state)) /* I/O error reading the partition table */
suzukib74a2f02007-03-16 13:38:25 -0800528 return -EIO;
Kay Sievers6bcf19d2008-03-09 21:26:02 +0100529
530 /* tell userspace that the media / partition table may have changed */
Tejun Heoed9e1982008-08-25 19:56:05 +0900531 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
Kay Sievers6bcf19d2008-03-09 21:26:02 +0100532
Tejun Heo540eed52008-08-25 19:56:15 +0900533 /* Detect the highest partition number and preallocate
534 * disk->part_tbl. This is an optimization and not strictly
535 * necessary.
536 */
537 for (p = 1, highest = 0; p < state->limit; p++)
538 if (state->parts[p].size)
539 highest = p;
540
541 disk_expand_part_tbl(disk, highest);
542
543 /* add partitions */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 for (p = 1; p < state->limit; p++) {
545 sector_t size = state->parts[p].size;
546 sector_t from = state->parts[p].from;
547 if (!size)
548 continue;
Kay Sieversac0d86f2008-10-15 22:04:21 -0700549 if (from >= get_capacity(disk)) {
Andrew Morton8d99f832008-09-13 02:33:25 -0700550 printk(KERN_WARNING
Kay Sieversac0d86f2008-10-15 22:04:21 -0700551 "%s: p%d ignored, start %llu is behind the end of the disk\n",
552 disk->disk_name, p, (unsigned long long) from);
553 continue;
554 }
555 if (from + size > get_capacity(disk)) {
556 /*
557 * we can not ignore partitions of broken tables
558 * created by for example camera firmware, but we
559 * limit them to the end of the disk to avoid
560 * creating invalid block devices
561 */
562 printk(KERN_WARNING
563 "%s: p%d size %llu limited to end of disk\n",
564 disk->disk_name, p, (unsigned long long) size);
565 size = get_capacity(disk) - from;
Mike Miller98bd34e2006-06-23 02:06:07 -0700566 }
Tejun Heoba329292008-11-10 15:29:58 +0900567 part = add_partition(disk, p, from, size,
568 state->parts[p].flags);
569 if (IS_ERR(part)) {
570 printk(KERN_ERR " %s: p%d could not be added: %ld\n",
571 disk->disk_name, p, -PTR_ERR(part));
Abdel Benamrouche04ebd4a2008-07-25 01:48:26 -0700572 continue;
573 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574#ifdef CONFIG_BLK_DEV_MD
Fabio Massimo Di Nittod18d7682007-02-10 23:50:00 -0800575 if (state->parts[p].flags & ADDPART_FLAG_RAID)
Tejun Heo55e8e302008-11-10 15:30:47 +0900576 md_autodetect_dev(part_to_dev(part)->devt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577#endif
578 }
579 kfree(state);
580 return 0;
581}
582
583unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
584{
585 struct address_space *mapping = bdev->bd_inode->i_mapping;
586 struct page *page;
587
Pekka Enberg090d2b12006-06-23 02:05:08 -0700588 page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
589 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 if (!IS_ERR(page)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 if (PageError(page))
592 goto fail;
593 p->v = page;
594 return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9);
595fail:
596 page_cache_release(page);
597 }
598 p->v = NULL;
599 return NULL;
600}
601
602EXPORT_SYMBOL(read_dev_sector);
603
604void del_gendisk(struct gendisk *disk)
605{
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200606 struct disk_part_iter piter;
607 struct hd_struct *part;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608
609 /* invalidate stuff */
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200610 disk_part_iter_init(&piter, disk,
611 DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE);
612 while ((part = disk_part_iter_next(&piter))) {
613 invalidate_partition(disk, part->partno);
614 delete_partition(disk, part->partno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 }
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200616 disk_part_iter_exit(&piter);
617
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 invalidate_partition(disk, 0);
Tejun Heo3e1a7ff2008-08-25 19:56:17 +0900619 blk_free_devt(disk_to_dev(disk)->devt);
Tejun Heo80795ae2008-08-25 19:56:07 +0900620 set_capacity(disk, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 disk->flags &= ~GENHD_FL_UP;
622 unlink_gendisk(disk);
Tejun Heo074a7ac2008-08-25 19:56:14 +0900623 part_stat_set_all(&disk->part0, 0);
624 disk->part0.stamp = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625
Tejun Heo4c465012008-08-25 19:56:11 +0900626 kobject_put(disk->part0.holder_dir);
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -0800627 kobject_put(disk->slave_dir);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200628 disk->driverfs_dev = NULL;
629#ifndef CONFIG_SYSFS_DEPRECATED
Tejun Heoed9e1982008-08-25 19:56:05 +0900630 sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk)));
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200631#endif
Tejun Heoed9e1982008-08-25 19:56:05 +0900632 device_del(disk_to_dev(disk));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633}