blob: f0f604950ff4433032076a9b612a4770f5c5752c [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 Heof331c022008-09-03 09:01:48 +0200137 int partno = 0;
138
139 if (bdev->bd_part)
140 partno = bdev->bd_part->partno;
141
Tejun Heocf771cb2008-09-03 09:01:09 +0200142 return disk_name(bdev->bd_disk, partno, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143}
144
145EXPORT_SYMBOL(bdevname);
146
147/*
148 * There's very little reason to use this, you should really
149 * have a struct block_device just about everywhere and use
150 * bdevname() instead.
151 */
152const char *__bdevname(dev_t dev, char *buffer)
153{
154 scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",
155 MAJOR(dev), MINOR(dev));
156 return buffer;
157}
158
159EXPORT_SYMBOL(__bdevname);
160
161static struct parsed_partitions *
162check_partition(struct gendisk *hd, struct block_device *bdev)
163{
164 struct parsed_partitions *state;
Suzuki K P57881dd2006-12-06 20:35:16 -0800165 int i, res, err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166
167 state = kmalloc(sizeof(struct parsed_partitions), GFP_KERNEL);
168 if (!state)
169 return NULL;
170
Greg Kroah-Hartmana2964182005-06-20 21:15:16 -0700171 disk_name(hd, 0, state->name);
172 printk(KERN_INFO " %s:", state->name);
173 if (isdigit(state->name[strlen(state->name)-1]))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 sprintf(state->name, "p");
Greg Kroah-Hartmana2964182005-06-20 21:15:16 -0700175
Tejun Heob5d0b9d2008-09-03 09:06:42 +0200176 state->limit = disk_max_parts(hd);
Suzuki K P57881dd2006-12-06 20:35:16 -0800177 i = res = err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 while (!res && check_part[i]) {
179 memset(&state->parts, 0, sizeof(state->parts));
180 res = check_part[i++](state, bdev);
Suzuki K P57881dd2006-12-06 20:35:16 -0800181 if (res < 0) {
182 /* We have hit an I/O error which we don't report now.
183 * But record it, and let the others do their job.
184 */
185 err = res;
186 res = 0;
187 }
188
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 }
190 if (res > 0)
191 return state;
suzuki9bebff62007-03-07 20:41:24 -0800192 if (err)
Suzuki K P57881dd2006-12-06 20:35:16 -0800193 /* The partition is unrecognized. So report I/O errors if there were any */
194 res = err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 if (!res)
196 printk(" unknown partition table\n");
197 else if (warn_no_part)
198 printk(" unable to read partition table\n");
199 kfree(state);
Suzuki Kp5127d002006-12-06 20:35:14 -0800200 return ERR_PTR(res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201}
202
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200203static ssize_t part_start_show(struct device *dev,
204 struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205{
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200206 struct hd_struct *p = dev_to_part(dev);
Kay Sieversa7fd6702005-10-01 14:49:43 +0200207
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200208 return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209}
210
Tejun Heoe5610522008-08-25 19:56:09 +0900211ssize_t part_size_show(struct device *dev,
212 struct device_attribute *attr, char *buf)
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200213{
214 struct hd_struct *p = dev_to_part(dev);
215 return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects);
216}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200218static ssize_t part_stat_show(struct device *dev,
219 struct device_attribute *attr, char *buf)
Kay Sieversa7fd6702005-10-01 14:49:43 +0200220{
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200221 struct hd_struct *p = dev_to_part(dev);
Tejun Heoc9959052008-08-25 19:47:21 +0900222 int cpu;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200223
Tejun Heoc9959052008-08-25 19:47:21 +0900224 cpu = disk_stat_lock();
225 part_round_stats(cpu, p);
226 disk_stat_unlock();
Jerome Marchand34e8bea2008-02-08 11:04:55 +0100227 return sprintf(buf,
228 "%8lu %8lu %8llu %8u "
229 "%8lu %8lu %8llu %8u "
230 "%8u %8u %8u"
231 "\n",
232 part_stat_read(p, ios[READ]),
233 part_stat_read(p, merges[READ]),
234 (unsigned long long)part_stat_read(p, sectors[READ]),
235 jiffies_to_msecs(part_stat_read(p, ticks[READ])),
236 part_stat_read(p, ios[WRITE]),
237 part_stat_read(p, merges[WRITE]),
238 (unsigned long long)part_stat_read(p, sectors[WRITE]),
239 jiffies_to_msecs(part_stat_read(p, ticks[WRITE])),
240 p->in_flight,
241 jiffies_to_msecs(part_stat_read(p, io_ticks)),
242 jiffies_to_msecs(part_stat_read(p, time_in_queue)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
Akinobu Mitac17bb492006-12-08 02:39:46 -0800245#ifdef CONFIG_FAIL_MAKE_REQUEST
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200246static ssize_t part_fail_show(struct device *dev,
247 struct device_attribute *attr, char *buf)
248{
249 struct hd_struct *p = dev_to_part(dev);
Akinobu Mitac17bb492006-12-08 02:39:46 -0800250
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200251 return sprintf(buf, "%d\n", p->make_it_fail);
252}
253
254static ssize_t part_fail_store(struct device *dev,
255 struct device_attribute *attr,
Akinobu Mitac17bb492006-12-08 02:39:46 -0800256 const char *buf, size_t count)
257{
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200258 struct hd_struct *p = dev_to_part(dev);
Akinobu Mitac17bb492006-12-08 02:39:46 -0800259 int i;
260
261 if (count > 0 && sscanf(buf, "%d", &i) > 0)
262 p->make_it_fail = (i == 0) ? 0 : 1;
263
264 return count;
265}
Akinobu Mitac17bb492006-12-08 02:39:46 -0800266#endif
267
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200268static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL);
269static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
270static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
Akinobu Mitac17bb492006-12-08 02:39:46 -0800271#ifdef CONFIG_FAIL_MAKE_REQUEST
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200272static struct device_attribute dev_attr_fail =
273 __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store);
Akinobu Mitac17bb492006-12-08 02:39:46 -0800274#endif
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200275
276static struct attribute *part_attrs[] = {
277 &dev_attr_start.attr,
278 &dev_attr_size.attr,
279 &dev_attr_stat.attr,
280#ifdef CONFIG_FAIL_MAKE_REQUEST
281 &dev_attr_fail.attr,
282#endif
283 NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284};
285
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200286static struct attribute_group part_attr_group = {
287 .attrs = part_attrs,
288};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200290static struct attribute_group *part_attr_groups[] = {
291 &part_attr_group,
292 NULL
293};
294
295static void part_release(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296{
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200297 struct hd_struct *p = dev_to_part(dev);
Jerome Marchand6f2576a2008-02-08 11:04:35 +0100298 free_part_stats(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 kfree(p);
300}
301
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200302struct device_type part_type = {
303 .name = "partition",
304 .groups = part_attr_groups,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 .release = part_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306};
307
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200308static void delete_partition_rcu_cb(struct rcu_head *head)
309{
310 struct hd_struct *part = container_of(head, struct hd_struct, rcu_head);
311
312 part->start_sect = 0;
313 part->nr_sects = 0;
314 part_stat_set_all(part, 0);
Tejun Heoed9e1982008-08-25 19:56:05 +0900315 put_device(part_to_dev(part));
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200316}
317
Tejun Heocf771cb2008-09-03 09:01:09 +0200318void delete_partition(struct gendisk *disk, int partno)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319{
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200320 struct hd_struct *part;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200321
Tejun Heob5d0b9d2008-09-03 09:06:42 +0200322 part = disk->__part[partno];
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200323 if (!part)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 return;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200325
Tejun Heobcce3de2008-08-25 19:47:22 +0900326 blk_free_devt(part_devt(part));
Tejun Heob5d0b9d2008-09-03 09:06:42 +0200327 rcu_assign_pointer(disk->__part[partno], NULL);
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200328 kobject_put(part->holder_dir);
Tejun Heoed9e1982008-08-25 19:56:05 +0900329 device_del(part_to_dev(part));
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200330
331 call_rcu(&part->rcu_head, delete_partition_rcu_cb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332}
333
Greg Kroah-Hartmanf4a00a22008-02-06 23:33:39 -0800334static ssize_t whole_disk_show(struct device *dev,
335 struct device_attribute *attr, char *buf)
336{
337 return 0;
338}
339static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH,
340 whole_disk_show, NULL);
341
Tejun Heocf771cb2008-09-03 09:01:09 +0200342int add_partition(struct gendisk *disk, int partno,
343 sector_t start, sector_t len, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344{
345 struct hd_struct *p;
Tejun Heobcce3de2008-08-25 19:47:22 +0900346 dev_t devt = MKDEV(0, 0);
Tejun Heoed9e1982008-08-25 19:56:05 +0900347 struct device *ddev = disk_to_dev(disk);
348 struct device *pdev;
349 const char *dname;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200350 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351
Tejun Heob5d0b9d2008-09-03 09:06:42 +0200352 if (disk->__part[partno])
Tejun Heo88e34122008-08-25 19:30:16 +0900353 return -EBUSY;
354
Yoann Padioleaudd00cc42007-07-19 01:49:03 -0700355 p = kzalloc(sizeof(*p), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 if (!p)
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700357 return -ENOMEM;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200358
Jerome Marchand6f2576a2008-02-08 11:04:35 +0100359 if (!init_part_stats(p)) {
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700360 err = -ENOMEM;
Tejun Heo88e34122008-08-25 19:30:16 +0900361 goto out_free;
Jerome Marchand6f2576a2008-02-08 11:04:35 +0100362 }
Tejun Heoed9e1982008-08-25 19:56:05 +0900363 pdev = part_to_dev(p);
364
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 p->start_sect = start;
366 p->nr_sects = len;
Tejun Heocf771cb2008-09-03 09:01:09 +0200367 p->partno = partno;
Tejun Heob7db9952008-08-25 19:56:10 +0900368 p->policy = get_disk_ro(disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369
Tejun Heoed9e1982008-08-25 19:56:05 +0900370 dname = dev_name(ddev);
371 if (isdigit(dname[strlen(dname) - 1]))
372 snprintf(pdev->bus_id, BUS_ID_SIZE, "%sp%d", dname, partno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 else
Tejun Heoed9e1982008-08-25 19:56:05 +0900374 snprintf(pdev->bus_id, BUS_ID_SIZE, "%s%d", dname, partno);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200375
Tejun Heoed9e1982008-08-25 19:56:05 +0900376 device_initialize(pdev);
377 pdev->class = &block_class;
378 pdev->type = &part_type;
379 pdev->parent = ddev;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200380
Tejun Heobcce3de2008-08-25 19:47:22 +0900381 err = blk_alloc_devt(p, &devt);
382 if (err)
Tejun Heoed9e1982008-08-25 19:56:05 +0900383 goto out_free;
384 pdev->devt = devt;
Tejun Heobcce3de2008-08-25 19:47:22 +0900385
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200386 /* delay uevent until 'holders' subdir is created */
Tejun Heoed9e1982008-08-25 19:56:05 +0900387 pdev->uevent_suppress = 1;
388 err = device_add(pdev);
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700389 if (err)
Tejun Heo88e34122008-08-25 19:30:16 +0900390 goto out_put;
391
392 err = -ENOMEM;
Tejun Heoed9e1982008-08-25 19:56:05 +0900393 p->holder_dir = kobject_create_and_add("holders", &pdev->kobj);
Tejun Heo88e34122008-08-25 19:30:16 +0900394 if (!p->holder_dir)
395 goto out_del;
396
Tejun Heoed9e1982008-08-25 19:56:05 +0900397 pdev->uevent_suppress = 0;
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700398 if (flags & ADDPART_FLAG_WHOLEDISK) {
Tejun Heoed9e1982008-08-25 19:56:05 +0900399 err = device_create_file(pdev, &dev_attr_whole_disk);
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700400 if (err)
Tejun Heo88e34122008-08-25 19:30:16 +0900401 goto out_del;
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700402 }
Jeff Garzikeee44cc2006-10-17 00:10:23 -0700403
Tejun Heo88e34122008-08-25 19:30:16 +0900404 /* everything is up and running, commence */
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200405 INIT_RCU_HEAD(&p->rcu_head);
Tejun Heob5d0b9d2008-09-03 09:06:42 +0200406 rcu_assign_pointer(disk->__part[partno], p);
Tejun Heo88e34122008-08-25 19:30:16 +0900407
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200408 /* suppress uevent if the disk supresses it */
Tejun Heoed9e1982008-08-25 19:56:05 +0900409 if (!ddev->uevent_suppress)
410 kobject_uevent(&pdev->kobj, KOBJ_ADD);
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700411
412 return 0;
413
Tejun Heo88e34122008-08-25 19:30:16 +0900414out_free:
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700415 kfree(p);
416 return err;
Tejun Heo88e34122008-08-25 19:30:16 +0900417out_del:
418 kobject_put(p->holder_dir);
Tejun Heoed9e1982008-08-25 19:56:05 +0900419 device_del(pdev);
Tejun Heo88e34122008-08-25 19:30:16 +0900420out_put:
Tejun Heoed9e1982008-08-25 19:56:05 +0900421 put_device(pdev);
Tejun Heobcce3de2008-08-25 19:47:22 +0900422 blk_free_devt(devt);
Tejun Heo88e34122008-08-25 19:30:16 +0900423 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424}
425
426/* Not exported, helper to add_disk(). */
427void register_disk(struct gendisk *disk)
428{
Tejun Heoed9e1982008-08-25 19:56:05 +0900429 struct device *ddev = disk_to_dev(disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 struct block_device *bdev;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200431 struct disk_part_iter piter;
432 struct hd_struct *part;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 char *s;
434 int err;
435
Tejun Heoed9e1982008-08-25 19:56:05 +0900436 ddev->parent = disk->driverfs_dev;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200437
Tejun Heoed9e1982008-08-25 19:56:05 +0900438 strlcpy(ddev->bus_id, disk->disk_name, BUS_ID_SIZE);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200439 /* ewww... some of these buggers have / in the name... */
Tejun Heoed9e1982008-08-25 19:56:05 +0900440 s = strchr(ddev->bus_id, '/');
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 if (s)
442 *s = '!';
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200443
444 /* delay uevents, until we scanned partition table */
Tejun Heoed9e1982008-08-25 19:56:05 +0900445 ddev->uevent_suppress = 1;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200446
Tejun Heoed9e1982008-08-25 19:56:05 +0900447 if (device_add(ddev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 return;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200449#ifndef CONFIG_SYSFS_DEPRECATED
Tejun Heoed9e1982008-08-25 19:56:05 +0900450 err = sysfs_create_link(block_depr, &ddev->kobj,
451 kobject_name(&ddev->kobj));
Jeff Garzikeee44cc2006-10-17 00:10:23 -0700452 if (err) {
Tejun Heoed9e1982008-08-25 19:56:05 +0900453 device_del(ddev);
Jeff Garzikeee44cc2006-10-17 00:10:23 -0700454 return;
455 }
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200456#endif
Tejun Heo4c465012008-08-25 19:56:11 +0900457 disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj);
458 disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459
460 /* No minors to use for partitions */
Tejun Heob5d0b9d2008-09-03 09:06:42 +0200461 if (!disk_partitionable(disk))
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100462 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463
464 /* No such device (e.g., media were just removed) */
465 if (!get_capacity(disk))
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100466 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467
468 bdev = bdget_disk(disk, 0);
469 if (!bdev)
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100470 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471
472 bdev->bd_invalidated = 1;
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100473 err = blkdev_get(bdev, FMODE_READ, 0);
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100474 if (err < 0)
475 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 blkdev_put(bdev);
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100477
478exit:
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200479 /* announce disk after possible partitions are created */
Tejun Heoed9e1982008-08-25 19:56:05 +0900480 ddev->uevent_suppress = 0;
481 kobject_uevent(&ddev->kobj, KOBJ_ADD);
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100482
483 /* announce possible partitions */
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200484 disk_part_iter_init(&piter, disk, 0);
485 while ((part = disk_part_iter_next(&piter)))
Tejun Heoed9e1982008-08-25 19:56:05 +0900486 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD);
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200487 disk_part_iter_exit(&piter);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488}
489
490int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
491{
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200492 struct disk_part_iter piter;
493 struct hd_struct *part;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 struct parsed_partitions *state;
495 int p, res;
496
497 if (bdev->bd_part_count)
498 return -EBUSY;
499 res = invalidate_partition(disk, 0);
500 if (res)
501 return res;
502 bdev->bd_invalidated = 0;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200503
504 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
505 while ((part = disk_part_iter_next(&piter)))
506 delete_partition(disk, part->partno);
507 disk_part_iter_exit(&piter);
508
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 if (disk->fops->revalidate_disk)
510 disk->fops->revalidate_disk(disk);
511 if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
512 return 0;
Suzuki Kp5127d002006-12-06 20:35:14 -0800513 if (IS_ERR(state)) /* I/O error reading the partition table */
suzukib74a2f02007-03-16 13:38:25 -0800514 return -EIO;
Kay Sievers6bcf19d2008-03-09 21:26:02 +0100515
516 /* tell userspace that the media / partition table may have changed */
Tejun Heoed9e1982008-08-25 19:56:05 +0900517 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
Kay Sievers6bcf19d2008-03-09 21:26:02 +0100518
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 for (p = 1; p < state->limit; p++) {
520 sector_t size = state->parts[p].size;
521 sector_t from = state->parts[p].from;
522 if (!size)
523 continue;
Mike Miller98bd34e2006-06-23 02:06:07 -0700524 if (from + size > get_capacity(disk)) {
Andrew Morton8d99f832008-09-13 02:33:25 -0700525 printk(KERN_WARNING
526 "%s: p%d exceeds device capacity\n",
Mike Miller98bd34e2006-06-23 02:06:07 -0700527 disk->disk_name, p);
528 }
Abdel Benamrouche04ebd4a2008-07-25 01:48:26 -0700529 res = add_partition(disk, p, from, size, state->parts[p].flags);
530 if (res) {
531 printk(KERN_ERR " %s: p%d could not be added: %d\n",
532 disk->disk_name, p, -res);
533 continue;
534 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535#ifdef CONFIG_BLK_DEV_MD
Fabio Massimo Di Nittod18d7682007-02-10 23:50:00 -0800536 if (state->parts[p].flags & ADDPART_FLAG_RAID)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 md_autodetect_dev(bdev->bd_dev+p);
538#endif
539 }
540 kfree(state);
541 return 0;
542}
543
544unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
545{
546 struct address_space *mapping = bdev->bd_inode->i_mapping;
547 struct page *page;
548
Pekka Enberg090d2b12006-06-23 02:05:08 -0700549 page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
550 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 if (!IS_ERR(page)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 if (PageError(page))
553 goto fail;
554 p->v = page;
555 return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9);
556fail:
557 page_cache_release(page);
558 }
559 p->v = NULL;
560 return NULL;
561}
562
563EXPORT_SYMBOL(read_dev_sector);
564
565void del_gendisk(struct gendisk *disk)
566{
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200567 struct disk_part_iter piter;
568 struct hd_struct *part;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569
570 /* invalidate stuff */
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200571 disk_part_iter_init(&piter, disk,
572 DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE);
573 while ((part = disk_part_iter_next(&piter))) {
574 invalidate_partition(disk, part->partno);
575 delete_partition(disk, part->partno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 }
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200577 disk_part_iter_exit(&piter);
578
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 invalidate_partition(disk, 0);
Tejun Heo80795ae2008-08-25 19:56:07 +0900580 set_capacity(disk, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 disk->flags &= ~GENHD_FL_UP;
582 unlink_gendisk(disk);
583 disk_stat_set_all(disk, 0);
Chen, Kenneth W20e5c812005-10-13 21:48:42 +0200584 disk->stamp = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585
Tejun Heo4c465012008-08-25 19:56:11 +0900586 kobject_put(disk->part0.holder_dir);
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -0800587 kobject_put(disk->slave_dir);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200588 disk->driverfs_dev = NULL;
589#ifndef CONFIG_SYSFS_DEPRECATED
Tejun Heoed9e1982008-08-25 19:56:05 +0900590 sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk)));
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200591#endif
Tejun Heoed9e1982008-08-25 19:56:05 +0900592 device_del(disk_to_dev(disk));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593}