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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
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> | |
6f2576af | 21 | #include <linux/genhd.h> |
1da177e4 LT |
22 | |
23 | #include "check.h" | |
1da177e4 LT |
24 | |
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" | |
0e6e1db4 | 37 | #include "karma.h" |
19d0e8ce | 38 | #include "sysv68.h" |
1da177e4 LT |
39 | |
40 | #ifdef CONFIG_BLK_DEV_MD | |
41 | extern void md_autodetect_dev(dev_t dev); | |
42 | #endif | |
43 | ||
44 | int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/ | |
45 | ||
46 | static 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 | |
1da177e4 LT |
83 | #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, | |
0e6e1db4 BC |
106 | #endif |
107 | #ifdef CONFIG_KARMA_PARTITION | |
108 | karma_partition, | |
19d0e8ce PDM |
109 | #endif |
110 | #ifdef CONFIG_SYSV68_PARTITION | |
111 | sysv68_partition, | |
1da177e4 LT |
112 | #endif |
113 | 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 | ||
cf771cb5 | 123 | char *disk_name(struct gendisk *hd, int partno, char *buf) |
1da177e4 | 124 | { |
cf771cb5 | 125 | if (!partno) |
1da177e4 LT |
126 | snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name); |
127 | else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) | |
cf771cb5 | 128 | snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, partno); |
1da177e4 | 129 | else |
cf771cb5 | 130 | snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, partno); |
1da177e4 LT |
131 | |
132 | return buf; | |
133 | } | |
134 | ||
135 | const char *bdevname(struct block_device *bdev, char *buf) | |
136 | { | |
f331c029 TH |
137 | int partno = 0; |
138 | ||
139 | if (bdev->bd_part) | |
140 | partno = bdev->bd_part->partno; | |
141 | ||
cf771cb5 | 142 | return disk_name(bdev->bd_disk, partno, buf); |
1da177e4 LT |
143 | } |
144 | ||
145 | EXPORT_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 | */ | |
152 | const 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 | ||
159 | EXPORT_SYMBOL(__bdevname); | |
160 | ||
161 | static struct parsed_partitions * | |
162 | check_partition(struct gendisk *hd, struct block_device *bdev) | |
163 | { | |
164 | struct parsed_partitions *state; | |
57881dd9 | 165 | int i, res, err; |
1da177e4 LT |
166 | |
167 | state = kmalloc(sizeof(struct parsed_partitions), GFP_KERNEL); | |
168 | if (!state) | |
169 | return NULL; | |
170 | ||
a2964188 GKH |
171 | disk_name(hd, 0, state->name); |
172 | printk(KERN_INFO " %s:", state->name); | |
173 | if (isdigit(state->name[strlen(state->name)-1])) | |
1da177e4 | 174 | sprintf(state->name, "p"); |
a2964188 | 175 | |
b5d0b9df | 176 | state->limit = disk_max_parts(hd); |
57881dd9 | 177 | i = res = err = 0; |
1da177e4 LT |
178 | while (!res && check_part[i]) { |
179 | memset(&state->parts, 0, sizeof(state->parts)); | |
180 | res = check_part[i++](state, bdev); | |
57881dd9 S |
181 | 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 | ||
1da177e4 LT |
189 | } |
190 | if (res > 0) | |
191 | return state; | |
9bebff6c | 192 | if (err) |
57881dd9 S |
193 | /* The partition is unrecognized. So report I/O errors if there were any */ |
194 | res = err; | |
1da177e4 LT |
195 | 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); | |
5127d002 | 200 | return ERR_PTR(res); |
1da177e4 LT |
201 | } |
202 | ||
edfaa7c3 KS |
203 | static ssize_t part_start_show(struct device *dev, |
204 | struct device_attribute *attr, char *buf) | |
1da177e4 | 205 | { |
edfaa7c3 | 206 | struct hd_struct *p = dev_to_part(dev); |
a7fd6706 | 207 | |
edfaa7c3 | 208 | return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect); |
1da177e4 LT |
209 | } |
210 | ||
e5610521 TH |
211 | ssize_t part_size_show(struct device *dev, |
212 | struct device_attribute *attr, char *buf) | |
a7fd6706 | 213 | { |
edfaa7c3 KS |
214 | struct hd_struct *p = dev_to_part(dev); |
215 | return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects); | |
a7fd6706 | 216 | } |
edfaa7c3 KS |
217 | |
218 | static ssize_t part_stat_show(struct device *dev, | |
219 | struct device_attribute *attr, char *buf) | |
1da177e4 | 220 | { |
edfaa7c3 | 221 | struct hd_struct *p = dev_to_part(dev); |
c9959059 | 222 | int cpu; |
edfaa7c3 | 223 | |
c9959059 TH |
224 | cpu = disk_stat_lock(); |
225 | part_round_stats(cpu, p); | |
226 | disk_stat_unlock(); | |
34e8beac JM |
227 | 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))); | |
1da177e4 | 243 | } |
1da177e4 | 244 | |
c17bb495 | 245 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 KS |
246 | static 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); | |
c17bb495 | 250 | |
edfaa7c3 KS |
251 | return sprintf(buf, "%d\n", p->make_it_fail); |
252 | } | |
253 | ||
254 | static ssize_t part_fail_store(struct device *dev, | |
255 | struct device_attribute *attr, | |
c17bb495 AM |
256 | const char *buf, size_t count) |
257 | { | |
edfaa7c3 | 258 | struct hd_struct *p = dev_to_part(dev); |
c17bb495 AM |
259 | 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 | } | |
edfaa7c3 | 266 | #endif |
c17bb495 | 267 | |
edfaa7c3 KS |
268 | static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL); |
269 | static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL); | |
270 | static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL); | |
271 | #ifdef CONFIG_FAIL_MAKE_REQUEST | |
272 | static struct device_attribute dev_attr_fail = | |
273 | __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store); | |
c17bb495 AM |
274 | #endif |
275 | ||
edfaa7c3 KS |
276 | static struct attribute *part_attrs[] = { |
277 | &dev_attr_start.attr, | |
278 | &dev_attr_size.attr, | |
279 | &dev_attr_stat.attr, | |
c17bb495 | 280 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 | 281 | &dev_attr_fail.attr, |
c17bb495 | 282 | #endif |
edfaa7c3 | 283 | NULL |
1da177e4 LT |
284 | }; |
285 | ||
edfaa7c3 KS |
286 | static struct attribute_group part_attr_group = { |
287 | .attrs = part_attrs, | |
288 | }; | |
1da177e4 | 289 | |
edfaa7c3 KS |
290 | static struct attribute_group *part_attr_groups[] = { |
291 | &part_attr_group, | |
292 | NULL | |
293 | }; | |
294 | ||
295 | static void part_release(struct device *dev) | |
1da177e4 | 296 | { |
edfaa7c3 | 297 | struct hd_struct *p = dev_to_part(dev); |
6f2576af | 298 | free_part_stats(p); |
1da177e4 LT |
299 | kfree(p); |
300 | } | |
301 | ||
edfaa7c3 KS |
302 | struct device_type part_type = { |
303 | .name = "partition", | |
304 | .groups = part_attr_groups, | |
1da177e4 | 305 | .release = part_release, |
1da177e4 LT |
306 | }; |
307 | ||
6a4d44c1 JN |
308 | static inline void disk_sysfs_add_subdirs(struct gendisk *disk) |
309 | { | |
310 | struct kobject *k; | |
311 | ||
ed9e1982 | 312 | k = kobject_get(&disk_to_dev(disk)->kobj); |
4ff6abff GKH |
313 | disk->holder_dir = kobject_create_and_add("holders", k); |
314 | disk->slave_dir = kobject_create_and_add("slaves", k); | |
6a4d44c1 JN |
315 | kobject_put(k); |
316 | } | |
6a4d44c1 | 317 | |
e71bf0d0 TH |
318 | static void delete_partition_rcu_cb(struct rcu_head *head) |
319 | { | |
320 | struct hd_struct *part = container_of(head, struct hd_struct, rcu_head); | |
321 | ||
322 | part->start_sect = 0; | |
323 | part->nr_sects = 0; | |
324 | part_stat_set_all(part, 0); | |
ed9e1982 | 325 | put_device(part_to_dev(part)); |
e71bf0d0 TH |
326 | } |
327 | ||
cf771cb5 | 328 | void delete_partition(struct gendisk *disk, int partno) |
1da177e4 | 329 | { |
e71bf0d0 | 330 | struct hd_struct *part; |
edfaa7c3 | 331 | |
b5d0b9df | 332 | part = disk->__part[partno]; |
e71bf0d0 | 333 | if (!part) |
1da177e4 | 334 | return; |
e71bf0d0 | 335 | |
bcce3de1 | 336 | blk_free_devt(part_devt(part)); |
b5d0b9df | 337 | rcu_assign_pointer(disk->__part[partno], NULL); |
e71bf0d0 | 338 | kobject_put(part->holder_dir); |
ed9e1982 | 339 | device_del(part_to_dev(part)); |
e71bf0d0 TH |
340 | |
341 | call_rcu(&part->rcu_head, delete_partition_rcu_cb); | |
1da177e4 LT |
342 | } |
343 | ||
f4a00a2c GKH |
344 | static ssize_t whole_disk_show(struct device *dev, |
345 | struct device_attribute *attr, char *buf) | |
346 | { | |
347 | return 0; | |
348 | } | |
349 | static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH, | |
350 | whole_disk_show, NULL); | |
351 | ||
cf771cb5 TH |
352 | int add_partition(struct gendisk *disk, int partno, |
353 | sector_t start, sector_t len, int flags) | |
1da177e4 LT |
354 | { |
355 | struct hd_struct *p; | |
bcce3de1 | 356 | dev_t devt = MKDEV(0, 0); |
ed9e1982 TH |
357 | struct device *ddev = disk_to_dev(disk); |
358 | struct device *pdev; | |
359 | const char *dname; | |
edfaa7c3 | 360 | int err; |
1da177e4 | 361 | |
b5d0b9df | 362 | if (disk->__part[partno]) |
88e34126 TH |
363 | return -EBUSY; |
364 | ||
dd00cc48 | 365 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
1da177e4 | 366 | if (!p) |
d805dda4 | 367 | return -ENOMEM; |
edfaa7c3 | 368 | |
6f2576af | 369 | if (!init_part_stats(p)) { |
d805dda4 | 370 | err = -ENOMEM; |
88e34126 | 371 | goto out_free; |
6f2576af | 372 | } |
ed9e1982 TH |
373 | pdev = part_to_dev(p); |
374 | ||
1da177e4 LT |
375 | p->start_sect = start; |
376 | p->nr_sects = len; | |
cf771cb5 | 377 | p->partno = partno; |
b7db9956 | 378 | p->policy = get_disk_ro(disk); |
1da177e4 | 379 | |
ed9e1982 TH |
380 | dname = dev_name(ddev); |
381 | if (isdigit(dname[strlen(dname) - 1])) | |
382 | snprintf(pdev->bus_id, BUS_ID_SIZE, "%sp%d", dname, partno); | |
1da177e4 | 383 | else |
ed9e1982 | 384 | snprintf(pdev->bus_id, BUS_ID_SIZE, "%s%d", dname, partno); |
edfaa7c3 | 385 | |
ed9e1982 TH |
386 | device_initialize(pdev); |
387 | pdev->class = &block_class; | |
388 | pdev->type = &part_type; | |
389 | pdev->parent = ddev; | |
edfaa7c3 | 390 | |
bcce3de1 TH |
391 | err = blk_alloc_devt(p, &devt); |
392 | if (err) | |
ed9e1982 TH |
393 | goto out_free; |
394 | pdev->devt = devt; | |
bcce3de1 | 395 | |
edfaa7c3 | 396 | /* delay uevent until 'holders' subdir is created */ |
ed9e1982 TH |
397 | pdev->uevent_suppress = 1; |
398 | err = device_add(pdev); | |
d805dda4 | 399 | if (err) |
88e34126 TH |
400 | goto out_put; |
401 | ||
402 | err = -ENOMEM; | |
ed9e1982 | 403 | p->holder_dir = kobject_create_and_add("holders", &pdev->kobj); |
88e34126 TH |
404 | if (!p->holder_dir) |
405 | goto out_del; | |
406 | ||
ed9e1982 | 407 | pdev->uevent_suppress = 0; |
d805dda4 | 408 | if (flags & ADDPART_FLAG_WHOLEDISK) { |
ed9e1982 | 409 | err = device_create_file(pdev, &dev_attr_whole_disk); |
d805dda4 | 410 | if (err) |
88e34126 | 411 | goto out_del; |
d805dda4 | 412 | } |
1da177e4 | 413 | |
88e34126 | 414 | /* everything is up and running, commence */ |
e71bf0d0 | 415 | INIT_RCU_HEAD(&p->rcu_head); |
b5d0b9df | 416 | rcu_assign_pointer(disk->__part[partno], p); |
88e34126 | 417 | |
edfaa7c3 | 418 | /* suppress uevent if the disk supresses it */ |
ed9e1982 TH |
419 | if (!ddev->uevent_suppress) |
420 | kobject_uevent(&pdev->kobj, KOBJ_ADD); | |
d805dda4 AB |
421 | |
422 | return 0; | |
423 | ||
88e34126 TH |
424 | out_free: |
425 | kfree(p); | |
426 | return err; | |
427 | out_del: | |
428 | kobject_put(p->holder_dir); | |
ed9e1982 | 429 | device_del(pdev); |
88e34126 | 430 | out_put: |
ed9e1982 | 431 | put_device(pdev); |
bcce3de1 | 432 | blk_free_devt(devt); |
d805dda4 | 433 | return err; |
1da177e4 LT |
434 | } |
435 | ||
436 | /* Not exported, helper to add_disk(). */ | |
437 | void register_disk(struct gendisk *disk) | |
438 | { | |
ed9e1982 | 439 | struct device *ddev = disk_to_dev(disk); |
1da177e4 | 440 | struct block_device *bdev; |
e71bf0d0 TH |
441 | struct disk_part_iter piter; |
442 | struct hd_struct *part; | |
1da177e4 LT |
443 | char *s; |
444 | int err; | |
445 | ||
ed9e1982 | 446 | ddev->parent = disk->driverfs_dev; |
edfaa7c3 | 447 | |
ed9e1982 | 448 | strlcpy(ddev->bus_id, disk->disk_name, BUS_ID_SIZE); |
edfaa7c3 | 449 | /* ewww... some of these buggers have / in the name... */ |
ed9e1982 | 450 | s = strchr(ddev->bus_id, '/'); |
1da177e4 LT |
451 | if (s) |
452 | *s = '!'; | |
edfaa7c3 KS |
453 | |
454 | /* delay uevents, until we scanned partition table */ | |
ed9e1982 | 455 | ddev->uevent_suppress = 1; |
edfaa7c3 | 456 | |
ed9e1982 | 457 | if (device_add(ddev)) |
1da177e4 | 458 | return; |
edfaa7c3 | 459 | #ifndef CONFIG_SYSFS_DEPRECATED |
ed9e1982 TH |
460 | err = sysfs_create_link(block_depr, &ddev->kobj, |
461 | kobject_name(&ddev->kobj)); | |
eee44cca | 462 | if (err) { |
ed9e1982 | 463 | device_del(ddev); |
eee44cca JG |
464 | return; |
465 | } | |
edfaa7c3 KS |
466 | #endif |
467 | disk_sysfs_add_subdirs(disk); | |
1da177e4 LT |
468 | |
469 | /* No minors to use for partitions */ | |
b5d0b9df | 470 | if (!disk_partitionable(disk)) |
d4d7e5df | 471 | goto exit; |
1da177e4 LT |
472 | |
473 | /* No such device (e.g., media were just removed) */ | |
474 | if (!get_capacity(disk)) | |
d4d7e5df | 475 | goto exit; |
1da177e4 LT |
476 | |
477 | bdev = bdget_disk(disk, 0); | |
478 | if (!bdev) | |
d4d7e5df | 479 | goto exit; |
1da177e4 LT |
480 | |
481 | bdev->bd_invalidated = 1; | |
d4d7e5df | 482 | err = blkdev_get(bdev, FMODE_READ, 0); |
d4d7e5df KS |
483 | if (err < 0) |
484 | goto exit; | |
1da177e4 | 485 | blkdev_put(bdev); |
d4d7e5df KS |
486 | |
487 | exit: | |
edfaa7c3 | 488 | /* announce disk after possible partitions are created */ |
ed9e1982 TH |
489 | ddev->uevent_suppress = 0; |
490 | kobject_uevent(&ddev->kobj, KOBJ_ADD); | |
d4d7e5df KS |
491 | |
492 | /* announce possible partitions */ | |
e71bf0d0 TH |
493 | disk_part_iter_init(&piter, disk, 0); |
494 | while ((part = disk_part_iter_next(&piter))) | |
ed9e1982 | 495 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD); |
e71bf0d0 | 496 | disk_part_iter_exit(&piter); |
1da177e4 LT |
497 | } |
498 | ||
499 | int rescan_partitions(struct gendisk *disk, struct block_device *bdev) | |
500 | { | |
e71bf0d0 TH |
501 | struct disk_part_iter piter; |
502 | struct hd_struct *part; | |
1da177e4 LT |
503 | struct parsed_partitions *state; |
504 | int p, res; | |
505 | ||
506 | if (bdev->bd_part_count) | |
507 | return -EBUSY; | |
508 | res = invalidate_partition(disk, 0); | |
509 | if (res) | |
510 | return res; | |
511 | bdev->bd_invalidated = 0; | |
e71bf0d0 TH |
512 | |
513 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); | |
514 | while ((part = disk_part_iter_next(&piter))) | |
515 | delete_partition(disk, part->partno); | |
516 | disk_part_iter_exit(&piter); | |
517 | ||
1da177e4 LT |
518 | if (disk->fops->revalidate_disk) |
519 | disk->fops->revalidate_disk(disk); | |
520 | if (!get_capacity(disk) || !(state = check_partition(disk, bdev))) | |
521 | return 0; | |
5127d002 | 522 | if (IS_ERR(state)) /* I/O error reading the partition table */ |
b74a2f09 | 523 | return -EIO; |
6bcf19d0 KS |
524 | |
525 | /* tell userspace that the media / partition table may have changed */ | |
ed9e1982 | 526 | kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); |
6bcf19d0 | 527 | |
1da177e4 LT |
528 | for (p = 1; p < state->limit; p++) { |
529 | sector_t size = state->parts[p].size; | |
530 | sector_t from = state->parts[p].from; | |
531 | if (!size) | |
532 | continue; | |
98bd34ea | 533 | if (from + size > get_capacity(disk)) { |
8d99f83b AM |
534 | printk(KERN_WARNING |
535 | "%s: p%d exceeds device capacity\n", | |
98bd34ea | 536 | disk->disk_name, p); |
04ebd4ae AB |
537 | } |
538 | res = add_partition(disk, p, from, size, state->parts[p].flags); | |
539 | if (res) { | |
540 | printk(KERN_ERR " %s: p%d could not be added: %d\n", | |
541 | disk->disk_name, p, -res); | |
542 | continue; | |
98bd34ea | 543 | } |
1da177e4 | 544 | #ifdef CONFIG_BLK_DEV_MD |
d18d7682 | 545 | if (state->parts[p].flags & ADDPART_FLAG_RAID) |
1da177e4 LT |
546 | md_autodetect_dev(bdev->bd_dev+p); |
547 | #endif | |
548 | } | |
549 | kfree(state); | |
550 | return 0; | |
551 | } | |
552 | ||
553 | unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p) | |
554 | { | |
555 | struct address_space *mapping = bdev->bd_inode->i_mapping; | |
556 | struct page *page; | |
557 | ||
090d2b18 PE |
558 | page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)), |
559 | NULL); | |
1da177e4 | 560 | if (!IS_ERR(page)) { |
1da177e4 LT |
561 | if (PageError(page)) |
562 | goto fail; | |
563 | p->v = page; | |
564 | return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9); | |
565 | fail: | |
566 | page_cache_release(page); | |
567 | } | |
568 | p->v = NULL; | |
569 | return NULL; | |
570 | } | |
571 | ||
572 | EXPORT_SYMBOL(read_dev_sector); | |
573 | ||
574 | void del_gendisk(struct gendisk *disk) | |
575 | { | |
e71bf0d0 TH |
576 | struct disk_part_iter piter; |
577 | struct hd_struct *part; | |
1da177e4 LT |
578 | |
579 | /* invalidate stuff */ | |
e71bf0d0 TH |
580 | disk_part_iter_init(&piter, disk, |
581 | DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE); | |
582 | while ((part = disk_part_iter_next(&piter))) { | |
583 | invalidate_partition(disk, part->partno); | |
584 | delete_partition(disk, part->partno); | |
1da177e4 | 585 | } |
e71bf0d0 TH |
586 | disk_part_iter_exit(&piter); |
587 | ||
1da177e4 | 588 | invalidate_partition(disk, 0); |
80795aef | 589 | set_capacity(disk, 0); |
1da177e4 LT |
590 | disk->flags &= ~GENHD_FL_UP; |
591 | unlink_gendisk(disk); | |
592 | disk_stat_set_all(disk, 0); | |
20e5c81f | 593 | disk->stamp = 0; |
1da177e4 | 594 | |
197b12d6 GKH |
595 | kobject_put(disk->holder_dir); |
596 | kobject_put(disk->slave_dir); | |
edfaa7c3 KS |
597 | disk->driverfs_dev = NULL; |
598 | #ifndef CONFIG_SYSFS_DEPRECATED | |
ed9e1982 | 599 | sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk))); |
edfaa7c3 | 600 | #endif |
ed9e1982 | 601 | device_del(disk_to_dev(disk)); |
1da177e4 | 602 | } |