blob: 7ef1f094de911998a88fe76bda393f136d60ec3c [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>
21#include <linux/devfs_fs_kernel.h>
22
23#include "check.h"
24#include "devfs.h"
25
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"
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 NULL
111};
112
113/*
114 * disk_name() is used by partition check code and the genhd driver.
115 * It formats the devicename of the indicated disk into
116 * the supplied buffer (of size at least 32), and returns
117 * a pointer to that same buffer (for convenience).
118 */
119
120char *disk_name(struct gendisk *hd, int part, char *buf)
121{
122 if (!part)
123 snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name);
124 else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1]))
125 snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, part);
126 else
127 snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, part);
128
129 return buf;
130}
131
132const char *bdevname(struct block_device *bdev, char *buf)
133{
134 int part = MINOR(bdev->bd_dev) - bdev->bd_disk->first_minor;
135 return disk_name(bdev->bd_disk, part, buf);
136}
137
138EXPORT_SYMBOL(bdevname);
139
140/*
141 * There's very little reason to use this, you should really
142 * have a struct block_device just about everywhere and use
143 * bdevname() instead.
144 */
145const char *__bdevname(dev_t dev, char *buffer)
146{
147 scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",
148 MAJOR(dev), MINOR(dev));
149 return buffer;
150}
151
152EXPORT_SYMBOL(__bdevname);
153
154static struct parsed_partitions *
155check_partition(struct gendisk *hd, struct block_device *bdev)
156{
157 struct parsed_partitions *state;
158 int i, res;
159
160 state = kmalloc(sizeof(struct parsed_partitions), GFP_KERNEL);
161 if (!state)
162 return NULL;
163
164#ifdef CONFIG_DEVFS_FS
165 if (hd->devfs_name[0] != '\0') {
166 printk(KERN_INFO " /dev/%s:", hd->devfs_name);
167 sprintf(state->name, "p");
168 }
169#endif
170 else {
171 disk_name(hd, 0, state->name);
172 printk(KERN_INFO " %s:", state->name);
173 if (isdigit(state->name[strlen(state->name)-1]))
174 sprintf(state->name, "p");
175 }
176 state->limit = hd->minors;
177 i = res = 0;
178 while (!res && check_part[i]) {
179 memset(&state->parts, 0, sizeof(state->parts));
180 res = check_part[i++](state, bdev);
181 }
182 if (res > 0)
183 return state;
184 if (!res)
185 printk(" unknown partition table\n");
186 else if (warn_no_part)
187 printk(" unable to read partition table\n");
188 kfree(state);
189 return NULL;
190}
191
192/*
193 * sysfs bindings for partitions
194 */
195
196struct part_attribute {
197 struct attribute attr;
198 ssize_t (*show)(struct hd_struct *,char *);
Kay Sieversa7fd6702005-10-01 14:49:43 +0200199 ssize_t (*store)(struct hd_struct *,const char *, size_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200};
201
202static ssize_t
203part_attr_show(struct kobject * kobj, struct attribute * attr, char * page)
204{
205 struct hd_struct * p = container_of(kobj,struct hd_struct,kobj);
206 struct part_attribute * part_attr = container_of(attr,struct part_attribute,attr);
207 ssize_t ret = 0;
208 if (part_attr->show)
Kay Sieversa7fd6702005-10-01 14:49:43 +0200209 ret = part_attr->show(p, page);
210 return ret;
211}
212static ssize_t
213part_attr_store(struct kobject * kobj, struct attribute * attr,
214 const char *page, size_t count)
215{
216 struct hd_struct * p = container_of(kobj,struct hd_struct,kobj);
217 struct part_attribute * part_attr = container_of(attr,struct part_attribute,attr);
218 ssize_t ret = 0;
219
220 if (part_attr->store)
221 ret = part_attr->store(p, page, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 return ret;
223}
224
225static struct sysfs_ops part_sysfs_ops = {
226 .show = part_attr_show,
Kay Sieversa7fd6702005-10-01 14:49:43 +0200227 .store = part_attr_store,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228};
229
Kay Sieversa7fd6702005-10-01 14:49:43 +0200230static ssize_t part_uevent_store(struct hd_struct * p,
231 const char *page, size_t count)
232{
Kay Sievers312c0042005-11-16 09:00:00 +0100233 kobject_uevent(&p->kobj, KOBJ_ADD);
Kay Sieversa7fd6702005-10-01 14:49:43 +0200234 return count;
235}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236static ssize_t part_dev_read(struct hd_struct * p, char *page)
237{
238 struct gendisk *disk = container_of(p->kobj.parent,struct gendisk,kobj);
239 dev_t dev = MKDEV(disk->major, disk->first_minor + p->partno);
240 return print_dev_t(page, dev);
241}
242static ssize_t part_start_read(struct hd_struct * p, char *page)
243{
244 return sprintf(page, "%llu\n",(unsigned long long)p->start_sect);
245}
246static ssize_t part_size_read(struct hd_struct * p, char *page)
247{
248 return sprintf(page, "%llu\n",(unsigned long long)p->nr_sects);
249}
250static ssize_t part_stat_read(struct hd_struct * p, char *page)
251{
252 return sprintf(page, "%8u %8llu %8u %8llu\n",
Jens Axboea3623572005-11-01 09:26:16 +0100253 p->ios[0], (unsigned long long)p->sectors[0],
254 p->ios[1], (unsigned long long)p->sectors[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255}
Kay Sieversa7fd6702005-10-01 14:49:43 +0200256static struct part_attribute part_attr_uevent = {
257 .attr = {.name = "uevent", .mode = S_IWUSR },
258 .store = part_uevent_store
259};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260static struct part_attribute part_attr_dev = {
261 .attr = {.name = "dev", .mode = S_IRUGO },
262 .show = part_dev_read
263};
264static struct part_attribute part_attr_start = {
265 .attr = {.name = "start", .mode = S_IRUGO },
266 .show = part_start_read
267};
268static struct part_attribute part_attr_size = {
269 .attr = {.name = "size", .mode = S_IRUGO },
270 .show = part_size_read
271};
272static struct part_attribute part_attr_stat = {
273 .attr = {.name = "stat", .mode = S_IRUGO },
274 .show = part_stat_read
275};
276
277static struct attribute * default_attrs[] = {
Kay Sieversa7fd6702005-10-01 14:49:43 +0200278 &part_attr_uevent.attr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 &part_attr_dev.attr,
280 &part_attr_start.attr,
281 &part_attr_size.attr,
282 &part_attr_stat.attr,
283 NULL,
284};
285
286extern struct subsystem block_subsys;
287
288static void part_release(struct kobject *kobj)
289{
290 struct hd_struct * p = container_of(kobj,struct hd_struct,kobj);
291 kfree(p);
292}
293
294struct kobj_type ktype_part = {
295 .release = part_release,
296 .default_attrs = default_attrs,
297 .sysfs_ops = &part_sysfs_ops,
298};
299
Jun'ichi Nomura6a4d44c2006-03-27 01:17:55 -0800300static inline void partition_sysfs_add_subdir(struct hd_struct *p)
301{
302 struct kobject *k;
303
304 k = kobject_get(&p->kobj);
305 p->holder_dir = kobject_add_dir(k, "holders");
306 kobject_put(k);
307}
308
309static inline void disk_sysfs_add_subdirs(struct gendisk *disk)
310{
311 struct kobject *k;
312
313 k = kobject_get(&disk->kobj);
314 disk->holder_dir = kobject_add_dir(k, "holders");
315 disk->slave_dir = kobject_add_dir(k, "slaves");
316 kobject_put(k);
317}
Jun'ichi Nomura6a4d44c2006-03-27 01:17:55 -0800318
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319void delete_partition(struct gendisk *disk, int part)
320{
321 struct hd_struct *p = disk->part[part-1];
322 if (!p)
323 return;
324 if (!p->nr_sects)
325 return;
326 disk->part[part-1] = NULL;
327 p->start_sect = 0;
328 p->nr_sects = 0;
Jens Axboea3623572005-11-01 09:26:16 +0100329 p->ios[0] = p->ios[1] = 0;
330 p->sectors[0] = p->sectors[1] = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 devfs_remove("%s/part%d", disk->devfs_name, part);
Jun'ichi Nomura6a4d44c2006-03-27 01:17:55 -0800332 if (p->holder_dir)
333 kobject_unregister(p->holder_dir);
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100334 kobject_uevent(&p->kobj, KOBJ_REMOVE);
335 kobject_del(&p->kobj);
336 kobject_put(&p->kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337}
338
339void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len)
340{
341 struct hd_struct *p;
342
343 p = kmalloc(sizeof(*p), GFP_KERNEL);
344 if (!p)
345 return;
346
347 memset(p, 0, sizeof(*p));
348 p->start_sect = start;
349 p->nr_sects = len;
350 p->partno = part;
351
352 devfs_mk_bdev(MKDEV(disk->major, disk->first_minor + part),
353 S_IFBLK|S_IRUSR|S_IWUSR,
354 "%s/part%d", disk->devfs_name, part);
355
356 if (isdigit(disk->kobj.name[strlen(disk->kobj.name)-1]))
357 snprintf(p->kobj.name,KOBJ_NAME_LEN,"%sp%d",disk->kobj.name,part);
358 else
359 snprintf(p->kobj.name,KOBJ_NAME_LEN,"%s%d",disk->kobj.name,part);
360 p->kobj.parent = &disk->kobj;
361 p->kobj.ktype = &ktype_part;
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100362 kobject_init(&p->kobj);
363 kobject_add(&p->kobj);
364 if (!disk->part_uevent_suppress)
365 kobject_uevent(&p->kobj, KOBJ_ADD);
Jun'ichi Nomura6a4d44c2006-03-27 01:17:55 -0800366 partition_sysfs_add_subdir(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 disk->part[part-1] = p;
368}
369
Greg Kroah-Hartman8218ef82005-12-13 15:17:34 -0800370static char *make_block_name(struct gendisk *disk)
371{
372 char *name;
373 static char *block_str = "block:";
374 int size;
Stephen Rothwell2436f032006-04-10 00:17:20 -0700375 char *s;
Greg Kroah-Hartman8218ef82005-12-13 15:17:34 -0800376
377 size = strlen(block_str) + strlen(disk->disk_name) + 1;
378 name = kmalloc(size, GFP_KERNEL);
379 if (!name)
380 return NULL;
381 strcpy(name, block_str);
382 strcat(name, disk->disk_name);
Stephen Rothwell2436f032006-04-10 00:17:20 -0700383 /* ewww... some of these buggers have / in name... */
384 s = strchr(name, '/');
385 if (s)
386 *s = '!';
Greg Kroah-Hartman8218ef82005-12-13 15:17:34 -0800387 return name;
388}
389
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390static void disk_sysfs_symlinks(struct gendisk *disk)
391{
392 struct device *target = get_device(disk->driverfs_dev);
393 if (target) {
Greg Kroah-Hartman8218ef82005-12-13 15:17:34 -0800394 char *disk_name = make_block_name(disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 sysfs_create_link(&disk->kobj,&target->kobj,"device");
Greg Kroah-Hartman8218ef82005-12-13 15:17:34 -0800396 if (disk_name) {
397 sysfs_create_link(&target->kobj,&disk->kobj,disk_name);
398 kfree(disk_name);
399 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 }
401}
402
403/* Not exported, helper to add_disk(). */
404void register_disk(struct gendisk *disk)
405{
406 struct block_device *bdev;
407 char *s;
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100408 int i;
409 struct hd_struct *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 int err;
411
412 strlcpy(disk->kobj.name,disk->disk_name,KOBJ_NAME_LEN);
413 /* ewww... some of these buggers have / in name... */
414 s = strchr(disk->kobj.name, '/');
415 if (s)
416 *s = '!';
417 if ((err = kobject_add(&disk->kobj)))
418 return;
419 disk_sysfs_symlinks(disk);
Jun'ichi Nomura6a4d44c2006-03-27 01:17:55 -0800420 disk_sysfs_add_subdirs(disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421
422 /* No minors to use for partitions */
423 if (disk->minors == 1) {
424 if (disk->devfs_name[0] != '\0')
425 devfs_add_disk(disk);
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100426 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 }
428
429 /* always add handle for the whole disk */
430 devfs_add_partitioned(disk);
431
432 /* No such device (e.g., media were just removed) */
433 if (!get_capacity(disk))
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100434 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435
436 bdev = bdget_disk(disk, 0);
437 if (!bdev)
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100438 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100440 /* scan partition table, but suppress uevents */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 bdev->bd_invalidated = 1;
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100442 disk->part_uevent_suppress = 1;
443 err = blkdev_get(bdev, FMODE_READ, 0);
444 disk->part_uevent_suppress = 0;
445 if (err < 0)
446 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 blkdev_put(bdev);
Kay Sieversd4d7e5d2006-03-24 20:45:35 +0100448
449exit:
450 /* announce disk after possible partitions are already created */
451 kobject_uevent(&disk->kobj, KOBJ_ADD);
452
453 /* announce possible partitions */
454 for (i = 1; i < disk->minors; i++) {
455 p = disk->part[i-1];
456 if (!p || !p->nr_sects)
457 continue;
458 kobject_uevent(&p->kobj, KOBJ_ADD);
459 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460}
461
462int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
463{
464 struct parsed_partitions *state;
465 int p, res;
466
467 if (bdev->bd_part_count)
468 return -EBUSY;
469 res = invalidate_partition(disk, 0);
470 if (res)
471 return res;
472 bdev->bd_invalidated = 0;
473 for (p = 1; p < disk->minors; p++)
474 delete_partition(disk, p);
475 if (disk->fops->revalidate_disk)
476 disk->fops->revalidate_disk(disk);
477 if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
478 return 0;
479 for (p = 1; p < state->limit; p++) {
480 sector_t size = state->parts[p].size;
481 sector_t from = state->parts[p].from;
482 if (!size)
483 continue;
484 add_partition(disk, p, from, size);
485#ifdef CONFIG_BLK_DEV_MD
486 if (state->parts[p].flags)
487 md_autodetect_dev(bdev->bd_dev+p);
488#endif
489 }
490 kfree(state);
491 return 0;
492}
493
494unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
495{
496 struct address_space *mapping = bdev->bd_inode->i_mapping;
497 struct page *page;
498
499 page = read_cache_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
500 (filler_t *)mapping->a_ops->readpage, NULL);
501 if (!IS_ERR(page)) {
502 wait_on_page_locked(page);
503 if (!PageUptodate(page))
504 goto fail;
505 if (PageError(page))
506 goto fail;
507 p->v = page;
508 return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9);
509fail:
510 page_cache_release(page);
511 }
512 p->v = NULL;
513 return NULL;
514}
515
516EXPORT_SYMBOL(read_dev_sector);
517
518void del_gendisk(struct gendisk *disk)
519{
520 int p;
521
522 /* invalidate stuff */
523 for (p = disk->minors - 1; p > 0; p--) {
524 invalidate_partition(disk, p);
525 delete_partition(disk, p);
526 }
527 invalidate_partition(disk, 0);
528 disk->capacity = 0;
529 disk->flags &= ~GENHD_FL_UP;
530 unlink_gendisk(disk);
531 disk_stat_set_all(disk, 0);
Chen, Kenneth W20e5c812005-10-13 21:48:42 +0200532 disk->stamp = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533
534 devfs_remove_disk(disk);
535
Linus Torvalds032ebf22006-05-12 18:42:09 -0700536 kobject_uevent(&disk->kobj, KOBJ_REMOVE);
Jun'ichi Nomura6a4d44c2006-03-27 01:17:55 -0800537 if (disk->holder_dir)
538 kobject_unregister(disk->holder_dir);
539 if (disk->slave_dir)
540 kobject_unregister(disk->slave_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 if (disk->driverfs_dev) {
Greg Kroah-Hartman8218ef82005-12-13 15:17:34 -0800542 char *disk_name = make_block_name(disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 sysfs_remove_link(&disk->kobj, "device");
Greg Kroah-Hartman8218ef82005-12-13 15:17:34 -0800544 if (disk_name) {
545 sysfs_remove_link(&disk->driverfs_dev->kobj, disk_name);
546 kfree(disk_name);
547 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 put_device(disk->driverfs_dev);
Linus Torvalds032ebf22006-05-12 18:42:09 -0700549 disk->driverfs_dev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 kobject_del(&disk->kobj);
552}