Commit | Line | Data |
---|---|---|
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 | { | |
0762b8bd | 137 | return disk_name(bdev->bd_disk, bdev->bd_part->partno, buf); |
1da177e4 LT |
138 | } |
139 | ||
140 | EXPORT_SYMBOL(bdevname); | |
141 | ||
142 | /* | |
143 | * There's very little reason to use this, you should really | |
144 | * have a struct block_device just about everywhere and use | |
145 | * bdevname() instead. | |
146 | */ | |
147 | const char *__bdevname(dev_t dev, char *buffer) | |
148 | { | |
149 | scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)", | |
150 | MAJOR(dev), MINOR(dev)); | |
151 | return buffer; | |
152 | } | |
153 | ||
154 | EXPORT_SYMBOL(__bdevname); | |
155 | ||
156 | static struct parsed_partitions * | |
157 | check_partition(struct gendisk *hd, struct block_device *bdev) | |
158 | { | |
159 | struct parsed_partitions *state; | |
57881dd9 | 160 | int i, res, err; |
1da177e4 LT |
161 | |
162 | state = kmalloc(sizeof(struct parsed_partitions), GFP_KERNEL); | |
163 | if (!state) | |
164 | return NULL; | |
165 | ||
a2964188 GKH |
166 | disk_name(hd, 0, state->name); |
167 | printk(KERN_INFO " %s:", state->name); | |
168 | if (isdigit(state->name[strlen(state->name)-1])) | |
1da177e4 | 169 | sprintf(state->name, "p"); |
a2964188 | 170 | |
b5d0b9df | 171 | state->limit = disk_max_parts(hd); |
57881dd9 | 172 | i = res = err = 0; |
1da177e4 LT |
173 | while (!res && check_part[i]) { |
174 | memset(&state->parts, 0, sizeof(state->parts)); | |
175 | res = check_part[i++](state, bdev); | |
57881dd9 S |
176 | if (res < 0) { |
177 | /* We have hit an I/O error which we don't report now. | |
178 | * But record it, and let the others do their job. | |
179 | */ | |
180 | err = res; | |
181 | res = 0; | |
182 | } | |
183 | ||
1da177e4 LT |
184 | } |
185 | if (res > 0) | |
186 | return state; | |
9bebff6c | 187 | if (err) |
57881dd9 S |
188 | /* The partition is unrecognized. So report I/O errors if there were any */ |
189 | res = err; | |
1da177e4 LT |
190 | if (!res) |
191 | printk(" unknown partition table\n"); | |
192 | else if (warn_no_part) | |
193 | printk(" unable to read partition table\n"); | |
194 | kfree(state); | |
5127d002 | 195 | return ERR_PTR(res); |
1da177e4 LT |
196 | } |
197 | ||
0fc71e3d TH |
198 | static ssize_t part_partition_show(struct device *dev, |
199 | struct device_attribute *attr, char *buf) | |
200 | { | |
201 | struct hd_struct *p = dev_to_part(dev); | |
202 | ||
203 | return sprintf(buf, "%d\n", p->partno); | |
204 | } | |
205 | ||
edfaa7c3 KS |
206 | static ssize_t part_start_show(struct device *dev, |
207 | struct device_attribute *attr, char *buf) | |
1da177e4 | 208 | { |
edfaa7c3 | 209 | struct hd_struct *p = dev_to_part(dev); |
a7fd6706 | 210 | |
edfaa7c3 | 211 | return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect); |
1da177e4 LT |
212 | } |
213 | ||
e5610521 TH |
214 | ssize_t part_size_show(struct device *dev, |
215 | struct device_attribute *attr, char *buf) | |
a7fd6706 | 216 | { |
edfaa7c3 KS |
217 | struct hd_struct *p = dev_to_part(dev); |
218 | return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects); | |
a7fd6706 | 219 | } |
edfaa7c3 | 220 | |
074a7aca TH |
221 | ssize_t part_stat_show(struct device *dev, |
222 | struct device_attribute *attr, char *buf) | |
1da177e4 | 223 | { |
edfaa7c3 | 224 | struct hd_struct *p = dev_to_part(dev); |
c9959059 | 225 | int cpu; |
edfaa7c3 | 226 | |
074a7aca | 227 | cpu = part_stat_lock(); |
c9959059 | 228 | part_round_stats(cpu, p); |
074a7aca | 229 | part_stat_unlock(); |
34e8beac JM |
230 | return sprintf(buf, |
231 | "%8lu %8lu %8llu %8u " | |
232 | "%8lu %8lu %8llu %8u " | |
233 | "%8u %8u %8u" | |
234 | "\n", | |
235 | part_stat_read(p, ios[READ]), | |
236 | part_stat_read(p, merges[READ]), | |
237 | (unsigned long long)part_stat_read(p, sectors[READ]), | |
238 | jiffies_to_msecs(part_stat_read(p, ticks[READ])), | |
239 | part_stat_read(p, ios[WRITE]), | |
240 | part_stat_read(p, merges[WRITE]), | |
241 | (unsigned long long)part_stat_read(p, sectors[WRITE]), | |
242 | jiffies_to_msecs(part_stat_read(p, ticks[WRITE])), | |
243 | p->in_flight, | |
244 | jiffies_to_msecs(part_stat_read(p, io_ticks)), | |
245 | jiffies_to_msecs(part_stat_read(p, time_in_queue))); | |
1da177e4 | 246 | } |
1da177e4 | 247 | |
c17bb495 | 248 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
eddb2e26 TH |
249 | ssize_t part_fail_show(struct device *dev, |
250 | struct device_attribute *attr, char *buf) | |
edfaa7c3 KS |
251 | { |
252 | struct hd_struct *p = dev_to_part(dev); | |
c17bb495 | 253 | |
edfaa7c3 KS |
254 | return sprintf(buf, "%d\n", p->make_it_fail); |
255 | } | |
256 | ||
eddb2e26 TH |
257 | ssize_t part_fail_store(struct device *dev, |
258 | struct device_attribute *attr, | |
259 | const char *buf, size_t count) | |
c17bb495 | 260 | { |
edfaa7c3 | 261 | struct hd_struct *p = dev_to_part(dev); |
c17bb495 AM |
262 | int i; |
263 | ||
264 | if (count > 0 && sscanf(buf, "%d", &i) > 0) | |
265 | p->make_it_fail = (i == 0) ? 0 : 1; | |
266 | ||
267 | return count; | |
268 | } | |
edfaa7c3 | 269 | #endif |
c17bb495 | 270 | |
0fc71e3d | 271 | static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL); |
edfaa7c3 KS |
272 | static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL); |
273 | static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL); | |
274 | static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL); | |
275 | #ifdef CONFIG_FAIL_MAKE_REQUEST | |
276 | static struct device_attribute dev_attr_fail = | |
277 | __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store); | |
c17bb495 AM |
278 | #endif |
279 | ||
edfaa7c3 | 280 | static struct attribute *part_attrs[] = { |
0fc71e3d | 281 | &dev_attr_partition.attr, |
edfaa7c3 KS |
282 | &dev_attr_start.attr, |
283 | &dev_attr_size.attr, | |
284 | &dev_attr_stat.attr, | |
c17bb495 | 285 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 | 286 | &dev_attr_fail.attr, |
c17bb495 | 287 | #endif |
edfaa7c3 | 288 | NULL |
1da177e4 LT |
289 | }; |
290 | ||
edfaa7c3 KS |
291 | static struct attribute_group part_attr_group = { |
292 | .attrs = part_attrs, | |
293 | }; | |
1da177e4 | 294 | |
edfaa7c3 KS |
295 | static struct attribute_group *part_attr_groups[] = { |
296 | &part_attr_group, | |
297 | NULL | |
298 | }; | |
299 | ||
300 | static void part_release(struct device *dev) | |
1da177e4 | 301 | { |
edfaa7c3 | 302 | struct hd_struct *p = dev_to_part(dev); |
6f2576af | 303 | free_part_stats(p); |
1da177e4 LT |
304 | kfree(p); |
305 | } | |
306 | ||
edfaa7c3 KS |
307 | struct device_type part_type = { |
308 | .name = "partition", | |
309 | .groups = part_attr_groups, | |
1da177e4 | 310 | .release = part_release, |
1da177e4 LT |
311 | }; |
312 | ||
e71bf0d0 TH |
313 | static void delete_partition_rcu_cb(struct rcu_head *head) |
314 | { | |
315 | struct hd_struct *part = container_of(head, struct hd_struct, rcu_head); | |
316 | ||
317 | part->start_sect = 0; | |
318 | part->nr_sects = 0; | |
319 | part_stat_set_all(part, 0); | |
ed9e1982 | 320 | put_device(part_to_dev(part)); |
e71bf0d0 TH |
321 | } |
322 | ||
cf771cb5 | 323 | void delete_partition(struct gendisk *disk, int partno) |
1da177e4 | 324 | { |
540eed56 | 325 | struct disk_part_tbl *ptbl = disk->part_tbl; |
e71bf0d0 | 326 | struct hd_struct *part; |
edfaa7c3 | 327 | |
540eed56 TH |
328 | if (partno >= ptbl->len) |
329 | return; | |
330 | ||
331 | part = ptbl->part[partno]; | |
e71bf0d0 | 332 | if (!part) |
1da177e4 | 333 | return; |
e71bf0d0 | 334 | |
bcce3de1 | 335 | blk_free_devt(part_devt(part)); |
540eed56 | 336 | rcu_assign_pointer(ptbl->part[partno], NULL); |
54b0d127 | 337 | rcu_assign_pointer(ptbl->last_lookup, 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 | ||
ba32929a TH |
352 | struct hd_struct *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; | |
540eed56 | 359 | struct disk_part_tbl *ptbl; |
ed9e1982 | 360 | const char *dname; |
edfaa7c3 | 361 | int err; |
1da177e4 | 362 | |
540eed56 TH |
363 | err = disk_expand_part_tbl(disk, partno); |
364 | if (err) | |
ba32929a | 365 | return ERR_PTR(err); |
540eed56 TH |
366 | ptbl = disk->part_tbl; |
367 | ||
368 | if (ptbl->part[partno]) | |
ba32929a | 369 | return ERR_PTR(-EBUSY); |
88e34126 | 370 | |
dd00cc48 | 371 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
1da177e4 | 372 | if (!p) |
ba32929a | 373 | return ERR_PTR(-EBUSY); |
edfaa7c3 | 374 | |
6f2576af | 375 | if (!init_part_stats(p)) { |
d805dda4 | 376 | err = -ENOMEM; |
88e34126 | 377 | goto out_free; |
6f2576af | 378 | } |
ed9e1982 TH |
379 | pdev = part_to_dev(p); |
380 | ||
1da177e4 LT |
381 | p->start_sect = start; |
382 | p->nr_sects = len; | |
cf771cb5 | 383 | p->partno = partno; |
b7db9956 | 384 | p->policy = get_disk_ro(disk); |
1da177e4 | 385 | |
ed9e1982 TH |
386 | dname = dev_name(ddev); |
387 | if (isdigit(dname[strlen(dname) - 1])) | |
3ada8b7e | 388 | dev_set_name(pdev, "%sp%d", dname, partno); |
1da177e4 | 389 | else |
3ada8b7e | 390 | dev_set_name(pdev, "%s%d", dname, partno); |
edfaa7c3 | 391 | |
ed9e1982 TH |
392 | device_initialize(pdev); |
393 | pdev->class = &block_class; | |
394 | pdev->type = &part_type; | |
395 | pdev->parent = ddev; | |
edfaa7c3 | 396 | |
bcce3de1 TH |
397 | err = blk_alloc_devt(p, &devt); |
398 | if (err) | |
eb60fa10 | 399 | goto out_free_stats; |
ed9e1982 | 400 | pdev->devt = devt; |
bcce3de1 | 401 | |
edfaa7c3 | 402 | /* delay uevent until 'holders' subdir is created */ |
ed9e1982 TH |
403 | pdev->uevent_suppress = 1; |
404 | err = device_add(pdev); | |
d805dda4 | 405 | if (err) |
88e34126 TH |
406 | goto out_put; |
407 | ||
408 | err = -ENOMEM; | |
ed9e1982 | 409 | p->holder_dir = kobject_create_and_add("holders", &pdev->kobj); |
88e34126 TH |
410 | if (!p->holder_dir) |
411 | goto out_del; | |
412 | ||
ed9e1982 | 413 | pdev->uevent_suppress = 0; |
d805dda4 | 414 | if (flags & ADDPART_FLAG_WHOLEDISK) { |
ed9e1982 | 415 | err = device_create_file(pdev, &dev_attr_whole_disk); |
d805dda4 | 416 | if (err) |
88e34126 | 417 | goto out_del; |
d805dda4 | 418 | } |
1da177e4 | 419 | |
88e34126 | 420 | /* everything is up and running, commence */ |
e71bf0d0 | 421 | INIT_RCU_HEAD(&p->rcu_head); |
540eed56 | 422 | rcu_assign_pointer(ptbl->part[partno], p); |
88e34126 | 423 | |
edfaa7c3 | 424 | /* suppress uevent if the disk supresses it */ |
ed9e1982 TH |
425 | if (!ddev->uevent_suppress) |
426 | kobject_uevent(&pdev->kobj, KOBJ_ADD); | |
d805dda4 | 427 | |
ba32929a | 428 | return p; |
d805dda4 | 429 | |
eb60fa10 TH |
430 | out_free_stats: |
431 | free_part_stats(p); | |
88e34126 TH |
432 | out_free: |
433 | kfree(p); | |
ba32929a | 434 | return ERR_PTR(err); |
88e34126 TH |
435 | out_del: |
436 | kobject_put(p->holder_dir); | |
ed9e1982 | 437 | device_del(pdev); |
88e34126 | 438 | out_put: |
ed9e1982 | 439 | put_device(pdev); |
bcce3de1 | 440 | blk_free_devt(devt); |
ba32929a | 441 | return ERR_PTR(err); |
1da177e4 LT |
442 | } |
443 | ||
444 | /* Not exported, helper to add_disk(). */ | |
445 | void register_disk(struct gendisk *disk) | |
446 | { | |
ed9e1982 | 447 | struct device *ddev = disk_to_dev(disk); |
1da177e4 | 448 | struct block_device *bdev; |
e71bf0d0 TH |
449 | struct disk_part_iter piter; |
450 | struct hd_struct *part; | |
1da177e4 LT |
451 | int err; |
452 | ||
ed9e1982 | 453 | ddev->parent = disk->driverfs_dev; |
edfaa7c3 | 454 | |
3ada8b7e | 455 | dev_set_name(ddev, disk->disk_name); |
edfaa7c3 KS |
456 | |
457 | /* delay uevents, until we scanned partition table */ | |
ed9e1982 | 458 | ddev->uevent_suppress = 1; |
edfaa7c3 | 459 | |
ed9e1982 | 460 | if (device_add(ddev)) |
1da177e4 | 461 | return; |
edfaa7c3 | 462 | #ifndef CONFIG_SYSFS_DEPRECATED |
ed9e1982 TH |
463 | err = sysfs_create_link(block_depr, &ddev->kobj, |
464 | kobject_name(&ddev->kobj)); | |
eee44cca | 465 | if (err) { |
ed9e1982 | 466 | device_del(ddev); |
eee44cca JG |
467 | return; |
468 | } | |
edfaa7c3 | 469 | #endif |
4c46501d TH |
470 | disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj); |
471 | disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj); | |
1da177e4 LT |
472 | |
473 | /* No minors to use for partitions */ | |
b5d0b9df | 474 | if (!disk_partitionable(disk)) |
d4d7e5df | 475 | goto exit; |
1da177e4 LT |
476 | |
477 | /* No such device (e.g., media were just removed) */ | |
478 | if (!get_capacity(disk)) | |
d4d7e5df | 479 | goto exit; |
1da177e4 LT |
480 | |
481 | bdev = bdget_disk(disk, 0); | |
482 | if (!bdev) | |
d4d7e5df | 483 | goto exit; |
1da177e4 LT |
484 | |
485 | bdev->bd_invalidated = 1; | |
572c4892 | 486 | err = blkdev_get(bdev, FMODE_READ); |
d4d7e5df KS |
487 | if (err < 0) |
488 | goto exit; | |
9a1c3542 | 489 | blkdev_put(bdev, FMODE_READ); |
d4d7e5df KS |
490 | |
491 | exit: | |
edfaa7c3 | 492 | /* announce disk after possible partitions are created */ |
ed9e1982 TH |
493 | ddev->uevent_suppress = 0; |
494 | kobject_uevent(&ddev->kobj, KOBJ_ADD); | |
d4d7e5df KS |
495 | |
496 | /* announce possible partitions */ | |
e71bf0d0 TH |
497 | disk_part_iter_init(&piter, disk, 0); |
498 | while ((part = disk_part_iter_next(&piter))) | |
ed9e1982 | 499 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD); |
e71bf0d0 | 500 | disk_part_iter_exit(&piter); |
1da177e4 LT |
501 | } |
502 | ||
503 | int rescan_partitions(struct gendisk *disk, struct block_device *bdev) | |
504 | { | |
e71bf0d0 TH |
505 | struct disk_part_iter piter; |
506 | struct hd_struct *part; | |
1da177e4 | 507 | struct parsed_partitions *state; |
540eed56 | 508 | int p, highest, res; |
1da177e4 LT |
509 | |
510 | if (bdev->bd_part_count) | |
511 | return -EBUSY; | |
512 | res = invalidate_partition(disk, 0); | |
513 | if (res) | |
514 | return res; | |
e71bf0d0 TH |
515 | |
516 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); | |
517 | while ((part = disk_part_iter_next(&piter))) | |
518 | delete_partition(disk, part->partno); | |
519 | disk_part_iter_exit(&piter); | |
520 | ||
1da177e4 LT |
521 | if (disk->fops->revalidate_disk) |
522 | disk->fops->revalidate_disk(disk); | |
9bc3ffbf AP |
523 | check_disk_size_change(disk, bdev); |
524 | bdev->bd_invalidated = 0; | |
1da177e4 LT |
525 | if (!get_capacity(disk) || !(state = check_partition(disk, bdev))) |
526 | return 0; | |
5127d002 | 527 | if (IS_ERR(state)) /* I/O error reading the partition table */ |
b74a2f09 | 528 | return -EIO; |
6bcf19d0 KS |
529 | |
530 | /* tell userspace that the media / partition table may have changed */ | |
ed9e1982 | 531 | kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); |
6bcf19d0 | 532 | |
540eed56 TH |
533 | /* Detect the highest partition number and preallocate |
534 | * disk->part_tbl. This is an optimization and not strictly | |
535 | * necessary. | |
536 | */ | |
537 | for (p = 1, highest = 0; p < state->limit; p++) | |
538 | if (state->parts[p].size) | |
539 | highest = p; | |
540 | ||
541 | disk_expand_part_tbl(disk, highest); | |
542 | ||
543 | /* add partitions */ | |
1da177e4 LT |
544 | for (p = 1; p < state->limit; p++) { |
545 | sector_t size = state->parts[p].size; | |
546 | sector_t from = state->parts[p].from; | |
547 | if (!size) | |
548 | continue; | |
ac0d86f5 KS |
549 | if (from >= get_capacity(disk)) { |
550 | printk(KERN_WARNING | |
551 | "%s: p%d ignored, start %llu is behind the end of the disk\n", | |
552 | disk->disk_name, p, (unsigned long long) from); | |
553 | continue; | |
554 | } | |
98bd34ea | 555 | if (from + size > get_capacity(disk)) { |
ac0d86f5 KS |
556 | /* |
557 | * we can not ignore partitions of broken tables | |
558 | * created by for example camera firmware, but we | |
559 | * limit them to the end of the disk to avoid | |
560 | * creating invalid block devices | |
561 | */ | |
8d99f83b | 562 | printk(KERN_WARNING |
ac0d86f5 KS |
563 | "%s: p%d size %llu limited to end of disk\n", |
564 | disk->disk_name, p, (unsigned long long) size); | |
565 | size = get_capacity(disk) - from; | |
04ebd4ae | 566 | } |
ba32929a TH |
567 | part = add_partition(disk, p, from, size, |
568 | state->parts[p].flags); | |
569 | if (IS_ERR(part)) { | |
570 | printk(KERN_ERR " %s: p%d could not be added: %ld\n", | |
571 | disk->disk_name, p, -PTR_ERR(part)); | |
04ebd4ae | 572 | continue; |
98bd34ea | 573 | } |
1da177e4 | 574 | #ifdef CONFIG_BLK_DEV_MD |
d18d7682 | 575 | if (state->parts[p].flags & ADDPART_FLAG_RAID) |
55e8e30c | 576 | md_autodetect_dev(part_to_dev(part)->devt); |
1da177e4 LT |
577 | #endif |
578 | } | |
579 | kfree(state); | |
580 | return 0; | |
581 | } | |
582 | ||
583 | unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p) | |
584 | { | |
585 | struct address_space *mapping = bdev->bd_inode->i_mapping; | |
586 | struct page *page; | |
587 | ||
090d2b18 PE |
588 | page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)), |
589 | NULL); | |
1da177e4 | 590 | if (!IS_ERR(page)) { |
1da177e4 LT |
591 | if (PageError(page)) |
592 | goto fail; | |
593 | p->v = page; | |
594 | return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9); | |
595 | fail: | |
596 | page_cache_release(page); | |
597 | } | |
598 | p->v = NULL; | |
599 | return NULL; | |
600 | } | |
601 | ||
602 | EXPORT_SYMBOL(read_dev_sector); | |
603 | ||
604 | void del_gendisk(struct gendisk *disk) | |
605 | { | |
e71bf0d0 TH |
606 | struct disk_part_iter piter; |
607 | struct hd_struct *part; | |
1da177e4 LT |
608 | |
609 | /* invalidate stuff */ | |
e71bf0d0 TH |
610 | disk_part_iter_init(&piter, disk, |
611 | DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE); | |
612 | while ((part = disk_part_iter_next(&piter))) { | |
613 | invalidate_partition(disk, part->partno); | |
614 | delete_partition(disk, part->partno); | |
1da177e4 | 615 | } |
e71bf0d0 TH |
616 | disk_part_iter_exit(&piter); |
617 | ||
1da177e4 | 618 | invalidate_partition(disk, 0); |
3e1a7ff8 | 619 | blk_free_devt(disk_to_dev(disk)->devt); |
80795aef | 620 | set_capacity(disk, 0); |
1da177e4 LT |
621 | disk->flags &= ~GENHD_FL_UP; |
622 | unlink_gendisk(disk); | |
074a7aca TH |
623 | part_stat_set_all(&disk->part0, 0); |
624 | disk->part0.stamp = 0; | |
1da177e4 | 625 | |
4c46501d | 626 | kobject_put(disk->part0.holder_dir); |
197b12d6 | 627 | kobject_put(disk->slave_dir); |
edfaa7c3 KS |
628 | disk->driverfs_dev = NULL; |
629 | #ifndef CONFIG_SYSFS_DEPRECATED | |
ed9e1982 | 630 | sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk))); |
edfaa7c3 | 631 | #endif |
ed9e1982 | 632 | device_del(disk_to_dev(disk)); |
1da177e4 | 633 | } |