blob: fbeaddf595d3ce8c456c4a58a9b31698f51b6506 [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])),
Nikanth Karthikesana9327ca2009-09-11 09:18:54 +0200251 part_in_flight(p),
Jerome Marchand34e8bea2008-02-08 11:04:55 +0100252 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
Nikanth Karthikesana9327ca2009-09-11 09:18:54 +0200256ssize_t part_inflight_show(struct device *dev,
257 struct device_attribute *attr, char *buf)
258{
259 struct hd_struct *p = dev_to_part(dev);
260
261 return sprintf(buf, "%8u %8u\n", p->in_flight[0], p->in_flight[1]);
262}
263
Akinobu Mitac17bb492006-12-08 02:39:46 -0800264#ifdef CONFIG_FAIL_MAKE_REQUEST
Tejun Heoeddb2e22008-08-25 19:56:13 +0900265ssize_t part_fail_show(struct device *dev,
266 struct device_attribute *attr, char *buf)
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200267{
268 struct hd_struct *p = dev_to_part(dev);
Akinobu Mitac17bb492006-12-08 02:39:46 -0800269
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200270 return sprintf(buf, "%d\n", p->make_it_fail);
271}
272
Tejun Heoeddb2e22008-08-25 19:56:13 +0900273ssize_t part_fail_store(struct device *dev,
274 struct device_attribute *attr,
275 const char *buf, size_t count)
Akinobu Mitac17bb492006-12-08 02:39:46 -0800276{
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200277 struct hd_struct *p = dev_to_part(dev);
Akinobu Mitac17bb492006-12-08 02:39:46 -0800278 int i;
279
280 if (count > 0 && sscanf(buf, "%d", &i) > 0)
281 p->make_it_fail = (i == 0) ? 0 : 1;
282
283 return count;
284}
Akinobu Mitac17bb492006-12-08 02:39:46 -0800285#endif
286
Tejun Heo0fc71e32008-10-13 13:27:59 +0200287static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200288static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL);
289static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
Martin K. Petersenc72758f2009-05-22 17:17:53 -0400290static DEVICE_ATTR(alignment_offset, S_IRUGO, part_alignment_offset_show, NULL);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200291static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
Nikanth Karthikesana9327ca2009-09-11 09:18:54 +0200292static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL);
Akinobu Mitac17bb492006-12-08 02:39:46 -0800293#ifdef CONFIG_FAIL_MAKE_REQUEST
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200294static struct device_attribute dev_attr_fail =
295 __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store);
Akinobu Mitac17bb492006-12-08 02:39:46 -0800296#endif
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200297
298static struct attribute *part_attrs[] = {
Tejun Heo0fc71e32008-10-13 13:27:59 +0200299 &dev_attr_partition.attr,
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200300 &dev_attr_start.attr,
301 &dev_attr_size.attr,
Martin K. Petersenc72758f2009-05-22 17:17:53 -0400302 &dev_attr_alignment_offset.attr,
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200303 &dev_attr_stat.attr,
Nikanth Karthikesana9327ca2009-09-11 09:18:54 +0200304 &dev_attr_inflight.attr,
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200305#ifdef CONFIG_FAIL_MAKE_REQUEST
306 &dev_attr_fail.attr,
307#endif
308 NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309};
310
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200311static struct attribute_group part_attr_group = {
312 .attrs = part_attrs,
313};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
David Brownella4dbd672009-06-24 10:06:31 -0700315static const struct attribute_group *part_attr_groups[] = {
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200316 &part_attr_group,
Arnaldo Carvalho de Meloc71a8962009-01-23 12:06:27 -0200317#ifdef CONFIG_BLK_DEV_IO_TRACE
318 &blk_trace_attr_group,
319#endif
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200320 NULL
321};
322
323static void part_release(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324{
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200325 struct hd_struct *p = dev_to_part(dev);
Jerome Marchand6f2576a2008-02-08 11:04:35 +0100326 free_part_stats(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 kfree(p);
328}
329
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200330struct device_type part_type = {
331 .name = "partition",
332 .groups = part_attr_groups,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 .release = part_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334};
335
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200336static void delete_partition_rcu_cb(struct rcu_head *head)
337{
338 struct hd_struct *part = container_of(head, struct hd_struct, rcu_head);
339
340 part->start_sect = 0;
341 part->nr_sects = 0;
342 part_stat_set_all(part, 0);
Tejun Heoed9e1982008-08-25 19:56:05 +0900343 put_device(part_to_dev(part));
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200344}
345
Tejun Heocf771cb2008-09-03 09:01:09 +0200346void delete_partition(struct gendisk *disk, int partno)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347{
Tejun Heo540eed52008-08-25 19:56:15 +0900348 struct disk_part_tbl *ptbl = disk->part_tbl;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200349 struct hd_struct *part;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200350
Tejun Heo540eed52008-08-25 19:56:15 +0900351 if (partno >= ptbl->len)
352 return;
353
354 part = ptbl->part[partno];
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200355 if (!part)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 return;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200357
Tejun Heobcce3de2008-08-25 19:47:22 +0900358 blk_free_devt(part_devt(part));
Tejun Heo540eed52008-08-25 19:56:15 +0900359 rcu_assign_pointer(ptbl->part[partno], NULL);
Neil Brown54b0d122009-01-07 08:55:39 +0100360 rcu_assign_pointer(ptbl->last_lookup, NULL);
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200361 kobject_put(part->holder_dir);
Tejun Heoed9e1982008-08-25 19:56:05 +0900362 device_del(part_to_dev(part));
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200363
364 call_rcu(&part->rcu_head, delete_partition_rcu_cb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365}
366
Greg Kroah-Hartmanf4a00a22008-02-06 23:33:39 -0800367static ssize_t whole_disk_show(struct device *dev,
368 struct device_attribute *attr, char *buf)
369{
370 return 0;
371}
372static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH,
373 whole_disk_show, NULL);
374
Tejun Heoba329292008-11-10 15:29:58 +0900375struct hd_struct *add_partition(struct gendisk *disk, int partno,
376 sector_t start, sector_t len, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377{
378 struct hd_struct *p;
Tejun Heobcce3de2008-08-25 19:47:22 +0900379 dev_t devt = MKDEV(0, 0);
Tejun Heoed9e1982008-08-25 19:56:05 +0900380 struct device *ddev = disk_to_dev(disk);
381 struct device *pdev;
Tejun Heo540eed52008-08-25 19:56:15 +0900382 struct disk_part_tbl *ptbl;
Tejun Heoed9e1982008-08-25 19:56:05 +0900383 const char *dname;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200384 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385
Tejun Heo540eed52008-08-25 19:56:15 +0900386 err = disk_expand_part_tbl(disk, partno);
387 if (err)
Tejun Heoba329292008-11-10 15:29:58 +0900388 return ERR_PTR(err);
Tejun Heo540eed52008-08-25 19:56:15 +0900389 ptbl = disk->part_tbl;
390
391 if (ptbl->part[partno])
Tejun Heoba329292008-11-10 15:29:58 +0900392 return ERR_PTR(-EBUSY);
Tejun Heo88e34122008-08-25 19:30:16 +0900393
Yoann Padioleaudd00cc42007-07-19 01:49:03 -0700394 p = kzalloc(sizeof(*p), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 if (!p)
Tejun Heoba329292008-11-10 15:29:58 +0900396 return ERR_PTR(-EBUSY);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200397
Jerome Marchand6f2576a2008-02-08 11:04:35 +0100398 if (!init_part_stats(p)) {
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700399 err = -ENOMEM;
Tejun Heo88e34122008-08-25 19:30:16 +0900400 goto out_free;
Jerome Marchand6f2576a2008-02-08 11:04:35 +0100401 }
Tejun Heoed9e1982008-08-25 19:56:05 +0900402 pdev = part_to_dev(p);
403
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 p->start_sect = start;
Martin K. Petersenc72758f2009-05-22 17:17:53 -0400405 p->alignment_offset = queue_sector_alignment_offset(disk->queue, start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 p->nr_sects = len;
Tejun Heocf771cb2008-09-03 09:01:09 +0200407 p->partno = partno;
Tejun Heob7db9952008-08-25 19:56:10 +0900408 p->policy = get_disk_ro(disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409
Tejun Heoed9e1982008-08-25 19:56:05 +0900410 dname = dev_name(ddev);
411 if (isdigit(dname[strlen(dname) - 1]))
Kay Sievers3ada8b72009-01-06 10:44:43 -0800412 dev_set_name(pdev, "%sp%d", dname, partno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 else
Kay Sievers3ada8b72009-01-06 10:44:43 -0800414 dev_set_name(pdev, "%s%d", dname, partno);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200415
Tejun Heoed9e1982008-08-25 19:56:05 +0900416 device_initialize(pdev);
417 pdev->class = &block_class;
418 pdev->type = &part_type;
419 pdev->parent = ddev;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200420
Tejun Heobcce3de2008-08-25 19:47:22 +0900421 err = blk_alloc_devt(p, &devt);
422 if (err)
Tejun Heoeb60fa12008-11-10 15:28:59 +0900423 goto out_free_stats;
Tejun Heoed9e1982008-08-25 19:56:05 +0900424 pdev->devt = devt;
Tejun Heobcce3de2008-08-25 19:47:22 +0900425
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200426 /* delay uevent until 'holders' subdir is created */
Ming Leif67f1292009-03-01 21:10:49 +0800427 dev_set_uevent_suppress(pdev, 1);
Tejun Heoed9e1982008-08-25 19:56:05 +0900428 err = device_add(pdev);
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700429 if (err)
Tejun Heo88e34122008-08-25 19:30:16 +0900430 goto out_put;
431
432 err = -ENOMEM;
Tejun Heoed9e1982008-08-25 19:56:05 +0900433 p->holder_dir = kobject_create_and_add("holders", &pdev->kobj);
Tejun Heo88e34122008-08-25 19:30:16 +0900434 if (!p->holder_dir)
435 goto out_del;
436
Ming Leif67f1292009-03-01 21:10:49 +0800437 dev_set_uevent_suppress(pdev, 0);
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700438 if (flags & ADDPART_FLAG_WHOLEDISK) {
Tejun Heoed9e1982008-08-25 19:56:05 +0900439 err = device_create_file(pdev, &dev_attr_whole_disk);
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700440 if (err)
Tejun Heo88e34122008-08-25 19:30:16 +0900441 goto out_del;
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700442 }
Jeff Garzikeee44cc2006-10-17 00:10:23 -0700443
Tejun Heo88e34122008-08-25 19:30:16 +0900444 /* everything is up and running, commence */
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200445 INIT_RCU_HEAD(&p->rcu_head);
Tejun Heo540eed52008-08-25 19:56:15 +0900446 rcu_assign_pointer(ptbl->part[partno], p);
Tejun Heo88e34122008-08-25 19:30:16 +0900447
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200448 /* suppress uevent if the disk supresses it */
Heiko Carstensf8c73c72009-06-11 15:14:40 +0200449 if (!dev_get_uevent_suppress(ddev))
Tejun Heoed9e1982008-08-25 19:56:05 +0900450 kobject_uevent(&pdev->kobj, KOBJ_ADD);
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700451
Tejun Heoba329292008-11-10 15:29:58 +0900452 return p;
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700453
Tejun Heoeb60fa12008-11-10 15:28:59 +0900454out_free_stats:
455 free_part_stats(p);
Tejun Heo88e34122008-08-25 19:30:16 +0900456out_free:
Abdel Benamrouched805dda2008-07-25 01:48:25 -0700457 kfree(p);
Tejun Heoba329292008-11-10 15:29:58 +0900458 return ERR_PTR(err);
Tejun Heo88e34122008-08-25 19:30:16 +0900459out_del:
460 kobject_put(p->holder_dir);
Tejun Heoed9e1982008-08-25 19:56:05 +0900461 device_del(pdev);
Tejun Heo88e34122008-08-25 19:30:16 +0900462out_put:
Tejun Heoed9e1982008-08-25 19:56:05 +0900463 put_device(pdev);
Tejun Heobcce3de2008-08-25 19:47:22 +0900464 blk_free_devt(devt);
Tejun Heoba329292008-11-10 15:29:58 +0900465 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466}
467
468/* Not exported, helper to add_disk(). */
469void register_disk(struct gendisk *disk)
470{
Tejun Heoed9e1982008-08-25 19:56:05 +0900471 struct device *ddev = disk_to_dev(disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 struct block_device *bdev;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200473 struct disk_part_iter piter;
474 struct hd_struct *part;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 int err;
476
Tejun Heoed9e1982008-08-25 19:56:05 +0900477 ddev->parent = disk->driverfs_dev;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200478
Kay Sievers3ada8b72009-01-06 10:44:43 -0800479 dev_set_name(ddev, disk->disk_name);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200480
481 /* delay uevents, until we scanned partition table */
Ming Leif67f1292009-03-01 21:10:49 +0800482 dev_set_uevent_suppress(ddev, 1);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200483
Tejun Heoed9e1982008-08-25 19:56:05 +0900484 if (device_add(ddev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 return;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200486#ifndef CONFIG_SYSFS_DEPRECATED
Tejun Heoed9e1982008-08-25 19:56:05 +0900487 err = sysfs_create_link(block_depr, &ddev->kobj,
488 kobject_name(&ddev->kobj));
Jeff Garzikeee44cc2006-10-17 00:10:23 -0700489 if (err) {
Tejun Heoed9e1982008-08-25 19:56:05 +0900490 device_del(ddev);
Jeff Garzikeee44cc2006-10-17 00:10:23 -0700491 return;
492 }
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200493#endif
Tejun Heo4c465012008-08-25 19:56:11 +0900494 disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj);
495 disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496
497 /* No minors to use for partitions */
Tejun Heob5d0b9d2008-09-03 09:06:42 +0200498 if (!disk_partitionable(disk))
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100499 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500
501 /* No such device (e.g., media were just removed) */
502 if (!get_capacity(disk))
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100503 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504
505 bdev = bdget_disk(disk, 0);
506 if (!bdev)
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100507 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508
509 bdev->bd_invalidated = 1;
Al Viro572c4892007-10-08 13:24:05 -0400510 err = blkdev_get(bdev, FMODE_READ);
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100511 if (err < 0)
512 goto exit;
Al Viro9a1c3542008-02-22 20:40:24 -0500513 blkdev_put(bdev, FMODE_READ);
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100514
515exit:
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200516 /* announce disk after possible partitions are created */
Ming Leif67f1292009-03-01 21:10:49 +0800517 dev_set_uevent_suppress(ddev, 0);
Tejun Heoed9e1982008-08-25 19:56:05 +0900518 kobject_uevent(&ddev->kobj, KOBJ_ADD);
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100519
520 /* announce possible partitions */
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200521 disk_part_iter_init(&piter, disk, 0);
522 while ((part = disk_part_iter_next(&piter)))
Tejun Heoed9e1982008-08-25 19:56:05 +0900523 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD);
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200524 disk_part_iter_exit(&piter);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525}
526
527int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
528{
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200529 struct disk_part_iter piter;
530 struct hd_struct *part;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 struct parsed_partitions *state;
Tejun Heo540eed52008-08-25 19:56:15 +0900532 int p, highest, res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533
534 if (bdev->bd_part_count)
535 return -EBUSY;
536 res = invalidate_partition(disk, 0);
537 if (res)
538 return res;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200539
540 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
541 while ((part = disk_part_iter_next(&piter)))
542 delete_partition(disk, part->partno);
543 disk_part_iter_exit(&piter);
544
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 if (disk->fops->revalidate_disk)
546 disk->fops->revalidate_disk(disk);
Andrew Patterson9bc3ffb2008-09-04 14:27:30 -0600547 check_disk_size_change(disk, bdev);
548 bdev->bd_invalidated = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
550 return 0;
Suzuki Kp5127d002006-12-06 20:35:14 -0800551 if (IS_ERR(state)) /* I/O error reading the partition table */
suzukib74a2f02007-03-16 13:38:25 -0800552 return -EIO;
Kay Sievers6bcf19d2008-03-09 21:26:02 +0100553
554 /* tell userspace that the media / partition table may have changed */
Tejun Heoed9e1982008-08-25 19:56:05 +0900555 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
Kay Sievers6bcf19d2008-03-09 21:26:02 +0100556
Tejun Heo540eed52008-08-25 19:56:15 +0900557 /* Detect the highest partition number and preallocate
558 * disk->part_tbl. This is an optimization and not strictly
559 * necessary.
560 */
561 for (p = 1, highest = 0; p < state->limit; p++)
562 if (state->parts[p].size)
563 highest = p;
564
565 disk_expand_part_tbl(disk, highest);
566
567 /* add partitions */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 for (p = 1; p < state->limit; p++) {
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200569 sector_t size, from;
570try_scan:
571 size = state->parts[p].size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 if (!size)
573 continue;
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200574
575 from = state->parts[p].from;
Kay Sieversac0d86f2008-10-15 22:04:21 -0700576 if (from >= get_capacity(disk)) {
Andrew Morton8d99f832008-09-13 02:33:25 -0700577 printk(KERN_WARNING
Kay Sieversac0d86f2008-10-15 22:04:21 -0700578 "%s: p%d ignored, start %llu is behind the end of the disk\n",
579 disk->disk_name, p, (unsigned long long) from);
580 continue;
581 }
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200582
Kay Sieversac0d86f2008-10-15 22:04:21 -0700583 if (from + size > get_capacity(disk)) {
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200584 struct block_device_operations *bdops = disk->fops;
585 unsigned long long capacity;
586
Kay Sieversac0d86f2008-10-15 22:04:21 -0700587 printk(KERN_WARNING
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200588 "%s: p%d size %llu exceeds device capacity, ",
Kay Sieversac0d86f2008-10-15 22:04:21 -0700589 disk->disk_name, p, (unsigned long long) size);
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200590
591 if (bdops->set_capacity &&
592 (disk->flags & GENHD_FL_NATIVE_CAPACITY) == 0) {
593 printk(KERN_CONT "enabling native capacity\n");
594 capacity = bdops->set_capacity(disk, ~0ULL);
595 disk->flags |= GENHD_FL_NATIVE_CAPACITY;
596 if (capacity > get_capacity(disk)) {
597 set_capacity(disk, capacity);
598 check_disk_size_change(disk, bdev);
599 bdev->bd_invalidated = 0;
600 }
601 goto try_scan;
602 } else {
603 /*
604 * we can not ignore partitions of broken tables
605 * created by for example camera firmware, but
606 * we limit them to the end of the disk to avoid
607 * creating invalid block devices
608 */
609 printk(KERN_CONT "limited to end of disk\n");
610 size = get_capacity(disk) - from;
611 }
Mike Miller98bd34e2006-06-23 02:06:07 -0700612 }
Tejun Heoba329292008-11-10 15:29:58 +0900613 part = add_partition(disk, p, from, size,
614 state->parts[p].flags);
615 if (IS_ERR(part)) {
616 printk(KERN_ERR " %s: p%d could not be added: %ld\n",
617 disk->disk_name, p, -PTR_ERR(part));
Abdel Benamrouche04ebd4a2008-07-25 01:48:26 -0700618 continue;
619 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620#ifdef CONFIG_BLK_DEV_MD
Fabio Massimo Di Nittod18d7682007-02-10 23:50:00 -0800621 if (state->parts[p].flags & ADDPART_FLAG_RAID)
Tejun Heo55e8e302008-11-10 15:30:47 +0900622 md_autodetect_dev(part_to_dev(part)->devt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623#endif
624 }
625 kfree(state);
626 return 0;
627}
628
629unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
630{
631 struct address_space *mapping = bdev->bd_inode->i_mapping;
632 struct page *page;
633
Pekka Enberg090d2b12006-06-23 02:05:08 -0700634 page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
635 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 if (!IS_ERR(page)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 if (PageError(page))
638 goto fail;
639 p->v = page;
640 return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9);
641fail:
642 page_cache_release(page);
643 }
644 p->v = NULL;
645 return NULL;
646}
647
648EXPORT_SYMBOL(read_dev_sector);
649
650void del_gendisk(struct gendisk *disk)
651{
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200652 struct disk_part_iter piter;
653 struct hd_struct *part;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654
655 /* invalidate stuff */
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200656 disk_part_iter_init(&piter, disk,
657 DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE);
658 while ((part = disk_part_iter_next(&piter))) {
659 invalidate_partition(disk, part->partno);
660 delete_partition(disk, part->partno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 }
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200662 disk_part_iter_exit(&piter);
663
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 invalidate_partition(disk, 0);
Tejun Heo3e1a7ff2008-08-25 19:56:17 +0900665 blk_free_devt(disk_to_dev(disk)->devt);
Tejun Heo80795ae2008-08-25 19:56:07 +0900666 set_capacity(disk, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 disk->flags &= ~GENHD_FL_UP;
668 unlink_gendisk(disk);
Tejun Heo074a7ac2008-08-25 19:56:14 +0900669 part_stat_set_all(&disk->part0, 0);
670 disk->part0.stamp = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671
Tejun Heo4c465012008-08-25 19:56:11 +0900672 kobject_put(disk->part0.holder_dir);
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -0800673 kobject_put(disk->slave_dir);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200674 disk->driverfs_dev = NULL;
675#ifndef CONFIG_SYSFS_DEPRECATED
Tejun Heoed9e1982008-08-25 19:56:05 +0900676 sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk)));
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200677#endif
Tejun Heoed9e1982008-08-25 19:56:05 +0900678 device_del(disk_to_dev(disk));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679}