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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 | |
f331c029 | 176 | state->limit = disk_max_parts(hd) + 1; |
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 | ||
edfaa7c3 KS |
211 | static 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 KS |
221 | struct hd_struct *p = dev_to_part(dev); |
222 | ||
34e8beac JM |
223 | preempt_disable(); |
224 | part_round_stats(p); | |
225 | preempt_enable(); | |
226 | return sprintf(buf, | |
227 | "%8lu %8lu %8llu %8u " | |
228 | "%8lu %8lu %8llu %8u " | |
229 | "%8u %8u %8u" | |
230 | "\n", | |
231 | part_stat_read(p, ios[READ]), | |
232 | part_stat_read(p, merges[READ]), | |
233 | (unsigned long long)part_stat_read(p, sectors[READ]), | |
234 | jiffies_to_msecs(part_stat_read(p, ticks[READ])), | |
235 | part_stat_read(p, ios[WRITE]), | |
236 | part_stat_read(p, merges[WRITE]), | |
237 | (unsigned long long)part_stat_read(p, sectors[WRITE]), | |
238 | jiffies_to_msecs(part_stat_read(p, ticks[WRITE])), | |
239 | p->in_flight, | |
240 | jiffies_to_msecs(part_stat_read(p, io_ticks)), | |
241 | jiffies_to_msecs(part_stat_read(p, time_in_queue))); | |
1da177e4 | 242 | } |
1da177e4 | 243 | |
c17bb495 | 244 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 KS |
245 | static ssize_t part_fail_show(struct device *dev, |
246 | struct device_attribute *attr, char *buf) | |
247 | { | |
248 | struct hd_struct *p = dev_to_part(dev); | |
c17bb495 | 249 | |
edfaa7c3 KS |
250 | return sprintf(buf, "%d\n", p->make_it_fail); |
251 | } | |
252 | ||
253 | static ssize_t part_fail_store(struct device *dev, | |
254 | struct device_attribute *attr, | |
c17bb495 AM |
255 | const char *buf, size_t count) |
256 | { | |
edfaa7c3 | 257 | struct hd_struct *p = dev_to_part(dev); |
c17bb495 AM |
258 | int i; |
259 | ||
260 | if (count > 0 && sscanf(buf, "%d", &i) > 0) | |
261 | p->make_it_fail = (i == 0) ? 0 : 1; | |
262 | ||
263 | return count; | |
264 | } | |
edfaa7c3 | 265 | #endif |
c17bb495 | 266 | |
edfaa7c3 KS |
267 | static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL); |
268 | static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL); | |
269 | static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL); | |
270 | #ifdef CONFIG_FAIL_MAKE_REQUEST | |
271 | static struct device_attribute dev_attr_fail = | |
272 | __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store); | |
c17bb495 AM |
273 | #endif |
274 | ||
edfaa7c3 KS |
275 | static struct attribute *part_attrs[] = { |
276 | &dev_attr_start.attr, | |
277 | &dev_attr_size.attr, | |
278 | &dev_attr_stat.attr, | |
c17bb495 | 279 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 | 280 | &dev_attr_fail.attr, |
c17bb495 | 281 | #endif |
edfaa7c3 | 282 | NULL |
1da177e4 LT |
283 | }; |
284 | ||
edfaa7c3 KS |
285 | static struct attribute_group part_attr_group = { |
286 | .attrs = part_attrs, | |
287 | }; | |
1da177e4 | 288 | |
edfaa7c3 KS |
289 | static struct attribute_group *part_attr_groups[] = { |
290 | &part_attr_group, | |
291 | NULL | |
292 | }; | |
293 | ||
294 | static void part_release(struct device *dev) | |
1da177e4 | 295 | { |
edfaa7c3 | 296 | struct hd_struct *p = dev_to_part(dev); |
6f2576af | 297 | free_part_stats(p); |
1da177e4 LT |
298 | kfree(p); |
299 | } | |
300 | ||
edfaa7c3 KS |
301 | struct device_type part_type = { |
302 | .name = "partition", | |
303 | .groups = part_attr_groups, | |
1da177e4 | 304 | .release = part_release, |
1da177e4 LT |
305 | }; |
306 | ||
6a4d44c1 JN |
307 | static inline void disk_sysfs_add_subdirs(struct gendisk *disk) |
308 | { | |
309 | struct kobject *k; | |
310 | ||
edfaa7c3 | 311 | k = kobject_get(&disk->dev.kobj); |
4ff6abff GKH |
312 | disk->holder_dir = kobject_create_and_add("holders", k); |
313 | disk->slave_dir = kobject_create_and_add("slaves", k); | |
6a4d44c1 JN |
314 | kobject_put(k); |
315 | } | |
6a4d44c1 | 316 | |
cf771cb5 | 317 | void delete_partition(struct gendisk *disk, int partno) |
1da177e4 | 318 | { |
cf771cb5 | 319 | struct hd_struct *p = disk->part[partno - 1]; |
edfaa7c3 | 320 | |
1da177e4 LT |
321 | if (!p) |
322 | return; | |
cf771cb5 | 323 | disk->part[partno - 1] = NULL; |
1da177e4 LT |
324 | p->start_sect = 0; |
325 | p->nr_sects = 0; | |
6f2576af | 326 | part_stat_set_all(p, 0); |
197b12d6 | 327 | kobject_put(p->holder_dir); |
edfaa7c3 KS |
328 | device_del(&p->dev); |
329 | put_device(&p->dev); | |
1da177e4 LT |
330 | } |
331 | ||
f4a00a2c GKH |
332 | static ssize_t whole_disk_show(struct device *dev, |
333 | struct device_attribute *attr, char *buf) | |
334 | { | |
335 | return 0; | |
336 | } | |
337 | static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH, | |
338 | whole_disk_show, NULL); | |
339 | ||
cf771cb5 TH |
340 | int add_partition(struct gendisk *disk, int partno, |
341 | sector_t start, sector_t len, int flags) | |
1da177e4 LT |
342 | { |
343 | struct hd_struct *p; | |
edfaa7c3 | 344 | int err; |
1da177e4 | 345 | |
cf771cb5 | 346 | if (disk->part[partno - 1]) |
88e34126 TH |
347 | return -EBUSY; |
348 | ||
dd00cc48 | 349 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
1da177e4 | 350 | if (!p) |
d805dda4 | 351 | return -ENOMEM; |
edfaa7c3 | 352 | |
6f2576af | 353 | if (!init_part_stats(p)) { |
d805dda4 | 354 | err = -ENOMEM; |
88e34126 | 355 | goto out_free; |
6f2576af | 356 | } |
1da177e4 LT |
357 | p->start_sect = start; |
358 | p->nr_sects = len; | |
cf771cb5 | 359 | p->partno = partno; |
25e206b5 | 360 | p->policy = disk->policy; |
1da177e4 | 361 | |
edfaa7c3 KS |
362 | if (isdigit(disk->dev.bus_id[strlen(disk->dev.bus_id)-1])) |
363 | snprintf(p->dev.bus_id, BUS_ID_SIZE, | |
cf771cb5 | 364 | "%sp%d", disk->dev.bus_id, partno); |
1da177e4 | 365 | else |
edfaa7c3 | 366 | snprintf(p->dev.bus_id, BUS_ID_SIZE, |
cf771cb5 | 367 | "%s%d", disk->dev.bus_id, partno); |
edfaa7c3 KS |
368 | |
369 | device_initialize(&p->dev); | |
cf771cb5 | 370 | p->dev.devt = MKDEV(disk->major, disk->first_minor + partno); |
edfaa7c3 KS |
371 | p->dev.class = &block_class; |
372 | p->dev.type = &part_type; | |
373 | p->dev.parent = &disk->dev; | |
edfaa7c3 KS |
374 | |
375 | /* delay uevent until 'holders' subdir is created */ | |
376 | p->dev.uevent_suppress = 1; | |
d805dda4 AB |
377 | err = device_add(&p->dev); |
378 | if (err) | |
88e34126 TH |
379 | goto out_put; |
380 | ||
381 | err = -ENOMEM; | |
382 | p->holder_dir = kobject_create_and_add("holders", &p->dev.kobj); | |
383 | if (!p->holder_dir) | |
384 | goto out_del; | |
385 | ||
edfaa7c3 | 386 | p->dev.uevent_suppress = 0; |
d805dda4 | 387 | if (flags & ADDPART_FLAG_WHOLEDISK) { |
f4a00a2c | 388 | err = device_create_file(&p->dev, &dev_attr_whole_disk); |
d805dda4 | 389 | if (err) |
88e34126 | 390 | goto out_del; |
d805dda4 | 391 | } |
1da177e4 | 392 | |
88e34126 | 393 | /* everything is up and running, commence */ |
cf771cb5 | 394 | disk->part[partno - 1] = p; |
88e34126 | 395 | |
edfaa7c3 KS |
396 | /* suppress uevent if the disk supresses it */ |
397 | if (!disk->dev.uevent_suppress) | |
398 | kobject_uevent(&p->dev.kobj, KOBJ_ADD); | |
d805dda4 AB |
399 | |
400 | return 0; | |
401 | ||
88e34126 TH |
402 | out_free: |
403 | kfree(p); | |
404 | return err; | |
405 | out_del: | |
406 | kobject_put(p->holder_dir); | |
d805dda4 | 407 | device_del(&p->dev); |
88e34126 | 408 | out_put: |
d805dda4 | 409 | put_device(&p->dev); |
d805dda4 | 410 | return err; |
1da177e4 LT |
411 | } |
412 | ||
413 | /* Not exported, helper to add_disk(). */ | |
414 | void register_disk(struct gendisk *disk) | |
415 | { | |
416 | struct block_device *bdev; | |
417 | char *s; | |
d4d7e5df KS |
418 | int i; |
419 | struct hd_struct *p; | |
1da177e4 LT |
420 | int err; |
421 | ||
edfaa7c3 | 422 | disk->dev.parent = disk->driverfs_dev; |
edfaa7c3 | 423 | |
aab0de24 | 424 | strlcpy(disk->dev.bus_id, disk->disk_name, BUS_ID_SIZE); |
edfaa7c3 KS |
425 | /* ewww... some of these buggers have / in the name... */ |
426 | s = strchr(disk->dev.bus_id, '/'); | |
1da177e4 LT |
427 | if (s) |
428 | *s = '!'; | |
edfaa7c3 KS |
429 | |
430 | /* delay uevents, until we scanned partition table */ | |
431 | disk->dev.uevent_suppress = 1; | |
432 | ||
433 | if (device_add(&disk->dev)) | |
1da177e4 | 434 | return; |
edfaa7c3 KS |
435 | #ifndef CONFIG_SYSFS_DEPRECATED |
436 | err = sysfs_create_link(block_depr, &disk->dev.kobj, | |
437 | kobject_name(&disk->dev.kobj)); | |
eee44cca | 438 | if (err) { |
edfaa7c3 | 439 | device_del(&disk->dev); |
eee44cca JG |
440 | return; |
441 | } | |
edfaa7c3 KS |
442 | #endif |
443 | disk_sysfs_add_subdirs(disk); | |
1da177e4 LT |
444 | |
445 | /* No minors to use for partitions */ | |
f331c029 | 446 | if (!disk_max_parts(disk)) |
d4d7e5df | 447 | goto exit; |
1da177e4 LT |
448 | |
449 | /* No such device (e.g., media were just removed) */ | |
450 | if (!get_capacity(disk)) | |
d4d7e5df | 451 | goto exit; |
1da177e4 LT |
452 | |
453 | bdev = bdget_disk(disk, 0); | |
454 | if (!bdev) | |
d4d7e5df | 455 | goto exit; |
1da177e4 LT |
456 | |
457 | bdev->bd_invalidated = 1; | |
d4d7e5df | 458 | err = blkdev_get(bdev, FMODE_READ, 0); |
d4d7e5df KS |
459 | if (err < 0) |
460 | goto exit; | |
1da177e4 | 461 | blkdev_put(bdev); |
d4d7e5df KS |
462 | |
463 | exit: | |
edfaa7c3 KS |
464 | /* announce disk after possible partitions are created */ |
465 | disk->dev.uevent_suppress = 0; | |
466 | kobject_uevent(&disk->dev.kobj, KOBJ_ADD); | |
d4d7e5df KS |
467 | |
468 | /* announce possible partitions */ | |
f331c029 TH |
469 | for (i = 0; i < disk_max_parts(disk); i++) { |
470 | p = disk->part[i]; | |
d4d7e5df KS |
471 | if (!p || !p->nr_sects) |
472 | continue; | |
edfaa7c3 | 473 | kobject_uevent(&p->dev.kobj, KOBJ_ADD); |
d4d7e5df | 474 | } |
1da177e4 LT |
475 | } |
476 | ||
477 | int rescan_partitions(struct gendisk *disk, struct block_device *bdev) | |
478 | { | |
479 | struct parsed_partitions *state; | |
480 | int p, res; | |
481 | ||
482 | if (bdev->bd_part_count) | |
483 | return -EBUSY; | |
484 | res = invalidate_partition(disk, 0); | |
485 | if (res) | |
486 | return res; | |
487 | bdev->bd_invalidated = 0; | |
f331c029 | 488 | for (p = 1; p <= disk_max_parts(disk); p++) |
1da177e4 LT |
489 | delete_partition(disk, p); |
490 | if (disk->fops->revalidate_disk) | |
491 | disk->fops->revalidate_disk(disk); | |
492 | if (!get_capacity(disk) || !(state = check_partition(disk, bdev))) | |
493 | return 0; | |
5127d002 | 494 | if (IS_ERR(state)) /* I/O error reading the partition table */ |
b74a2f09 | 495 | return -EIO; |
6bcf19d0 KS |
496 | |
497 | /* tell userspace that the media / partition table may have changed */ | |
498 | kobject_uevent(&disk->dev.kobj, KOBJ_CHANGE); | |
499 | ||
1da177e4 LT |
500 | for (p = 1; p < state->limit; p++) { |
501 | sector_t size = state->parts[p].size; | |
502 | sector_t from = state->parts[p].from; | |
503 | if (!size) | |
504 | continue; | |
98bd34ea | 505 | if (from + size > get_capacity(disk)) { |
8d99f83b AM |
506 | printk(KERN_WARNING |
507 | "%s: p%d exceeds device capacity\n", | |
98bd34ea | 508 | disk->disk_name, p); |
04ebd4ae AB |
509 | } |
510 | res = add_partition(disk, p, from, size, state->parts[p].flags); | |
511 | if (res) { | |
512 | printk(KERN_ERR " %s: p%d could not be added: %d\n", | |
513 | disk->disk_name, p, -res); | |
514 | continue; | |
98bd34ea | 515 | } |
1da177e4 | 516 | #ifdef CONFIG_BLK_DEV_MD |
d18d7682 | 517 | if (state->parts[p].flags & ADDPART_FLAG_RAID) |
1da177e4 LT |
518 | md_autodetect_dev(bdev->bd_dev+p); |
519 | #endif | |
520 | } | |
521 | kfree(state); | |
522 | return 0; | |
523 | } | |
524 | ||
525 | unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p) | |
526 | { | |
527 | struct address_space *mapping = bdev->bd_inode->i_mapping; | |
528 | struct page *page; | |
529 | ||
090d2b18 PE |
530 | page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)), |
531 | NULL); | |
1da177e4 | 532 | if (!IS_ERR(page)) { |
1da177e4 LT |
533 | if (PageError(page)) |
534 | goto fail; | |
535 | p->v = page; | |
536 | return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9); | |
537 | fail: | |
538 | page_cache_release(page); | |
539 | } | |
540 | p->v = NULL; | |
541 | return NULL; | |
542 | } | |
543 | ||
544 | EXPORT_SYMBOL(read_dev_sector); | |
545 | ||
546 | void del_gendisk(struct gendisk *disk) | |
547 | { | |
548 | int p; | |
549 | ||
550 | /* invalidate stuff */ | |
f331c029 | 551 | for (p = disk_max_parts(disk); p > 0; p--) { |
1da177e4 LT |
552 | invalidate_partition(disk, p); |
553 | delete_partition(disk, p); | |
554 | } | |
555 | invalidate_partition(disk, 0); | |
556 | disk->capacity = 0; | |
557 | disk->flags &= ~GENHD_FL_UP; | |
558 | unlink_gendisk(disk); | |
559 | disk_stat_set_all(disk, 0); | |
20e5c81f | 560 | disk->stamp = 0; |
1da177e4 | 561 | |
197b12d6 GKH |
562 | kobject_put(disk->holder_dir); |
563 | kobject_put(disk->slave_dir); | |
edfaa7c3 KS |
564 | disk->driverfs_dev = NULL; |
565 | #ifndef CONFIG_SYSFS_DEPRECATED | |
566 | sysfs_remove_link(block_depr, disk->dev.bus_id); | |
567 | #endif | |
568 | device_del(&disk->dev); | |
1da177e4 | 569 | } |