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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> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
1da177e4 LT |
20 | #include <linux/kmod.h> |
21 | #include <linux/ctype.h> | |
6f2576af | 22 | #include <linux/genhd.h> |
157f9c00 | 23 | #include <linux/blktrace_api.h> |
1da177e4 LT |
24 | |
25 | #include "check.h" | |
1da177e4 LT |
26 | |
27 | #include "acorn.h" | |
28 | #include "amiga.h" | |
29 | #include "atari.h" | |
30 | #include "ldm.h" | |
31 | #include "mac.h" | |
32 | #include "msdos.h" | |
33 | #include "osf.h" | |
34 | #include "sgi.h" | |
35 | #include "sun.h" | |
36 | #include "ibm.h" | |
37 | #include "ultrix.h" | |
38 | #include "efi.h" | |
0e6e1db4 | 39 | #include "karma.h" |
19d0e8ce | 40 | #include "sysv68.h" |
1da177e4 LT |
41 | |
42 | #ifdef CONFIG_BLK_DEV_MD | |
43 | extern void md_autodetect_dev(dev_t dev); | |
44 | #endif | |
45 | ||
46 | int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/ | |
47 | ||
48 | static int (*check_part[])(struct parsed_partitions *, struct block_device *) = { | |
49 | /* | |
50 | * Probe partition formats with tables at disk address 0 | |
51 | * that also have an ADFS boot block at 0xdc0. | |
52 | */ | |
53 | #ifdef CONFIG_ACORN_PARTITION_ICS | |
54 | adfspart_check_ICS, | |
55 | #endif | |
56 | #ifdef CONFIG_ACORN_PARTITION_POWERTEC | |
57 | adfspart_check_POWERTEC, | |
58 | #endif | |
59 | #ifdef CONFIG_ACORN_PARTITION_EESOX | |
60 | adfspart_check_EESOX, | |
61 | #endif | |
62 | ||
63 | /* | |
64 | * Now move on to formats that only have partition info at | |
65 | * disk address 0xdc0. Since these may also have stale | |
66 | * PC/BIOS partition tables, they need to come before | |
67 | * the msdos entry. | |
68 | */ | |
69 | #ifdef CONFIG_ACORN_PARTITION_CUMANA | |
70 | adfspart_check_CUMANA, | |
71 | #endif | |
72 | #ifdef CONFIG_ACORN_PARTITION_ADFS | |
73 | adfspart_check_ADFS, | |
74 | #endif | |
75 | ||
76 | #ifdef CONFIG_EFI_PARTITION | |
77 | efi_partition, /* this must come before msdos */ | |
78 | #endif | |
79 | #ifdef CONFIG_SGI_PARTITION | |
80 | sgi_partition, | |
81 | #endif | |
82 | #ifdef CONFIG_LDM_PARTITION | |
83 | ldm_partition, /* this must come before msdos */ | |
84 | #endif | |
1da177e4 LT |
85 | #ifdef CONFIG_MSDOS_PARTITION |
86 | msdos_partition, | |
87 | #endif | |
88 | #ifdef CONFIG_OSF_PARTITION | |
89 | osf_partition, | |
90 | #endif | |
91 | #ifdef CONFIG_SUN_PARTITION | |
92 | sun_partition, | |
93 | #endif | |
94 | #ifdef CONFIG_AMIGA_PARTITION | |
95 | amiga_partition, | |
96 | #endif | |
97 | #ifdef CONFIG_ATARI_PARTITION | |
98 | atari_partition, | |
99 | #endif | |
100 | #ifdef CONFIG_MAC_PARTITION | |
101 | mac_partition, | |
102 | #endif | |
103 | #ifdef CONFIG_ULTRIX_PARTITION | |
104 | ultrix_partition, | |
105 | #endif | |
106 | #ifdef CONFIG_IBM_PARTITION | |
107 | ibm_partition, | |
0e6e1db4 BC |
108 | #endif |
109 | #ifdef CONFIG_KARMA_PARTITION | |
110 | karma_partition, | |
19d0e8ce PDM |
111 | #endif |
112 | #ifdef CONFIG_SYSV68_PARTITION | |
113 | sysv68_partition, | |
1da177e4 LT |
114 | #endif |
115 | NULL | |
116 | }; | |
117 | ||
118 | /* | |
119 | * disk_name() is used by partition check code and the genhd driver. | |
120 | * It formats the devicename of the indicated disk into | |
121 | * the supplied buffer (of size at least 32), and returns | |
122 | * a pointer to that same buffer (for convenience). | |
123 | */ | |
124 | ||
cf771cb5 | 125 | char *disk_name(struct gendisk *hd, int partno, char *buf) |
1da177e4 | 126 | { |
cf771cb5 | 127 | if (!partno) |
1da177e4 LT |
128 | snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name); |
129 | else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) | |
cf771cb5 | 130 | snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, partno); |
1da177e4 | 131 | else |
cf771cb5 | 132 | snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, partno); |
1da177e4 LT |
133 | |
134 | return buf; | |
135 | } | |
136 | ||
137 | const char *bdevname(struct block_device *bdev, char *buf) | |
138 | { | |
0762b8bd | 139 | return disk_name(bdev->bd_disk, bdev->bd_part->partno, buf); |
1da177e4 LT |
140 | } |
141 | ||
142 | EXPORT_SYMBOL(bdevname); | |
143 | ||
144 | /* | |
145 | * There's very little reason to use this, you should really | |
146 | * have a struct block_device just about everywhere and use | |
147 | * bdevname() instead. | |
148 | */ | |
149 | const char *__bdevname(dev_t dev, char *buffer) | |
150 | { | |
151 | scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)", | |
152 | MAJOR(dev), MINOR(dev)); | |
153 | return buffer; | |
154 | } | |
155 | ||
156 | EXPORT_SYMBOL(__bdevname); | |
157 | ||
158 | static struct parsed_partitions * | |
159 | check_partition(struct gendisk *hd, struct block_device *bdev) | |
160 | { | |
161 | struct parsed_partitions *state; | |
57881dd9 | 162 | int i, res, err; |
1da177e4 LT |
163 | |
164 | state = kmalloc(sizeof(struct parsed_partitions), GFP_KERNEL); | |
165 | if (!state) | |
166 | return NULL; | |
167 | ||
a2964188 GKH |
168 | disk_name(hd, 0, state->name); |
169 | printk(KERN_INFO " %s:", state->name); | |
170 | if (isdigit(state->name[strlen(state->name)-1])) | |
1da177e4 | 171 | sprintf(state->name, "p"); |
a2964188 | 172 | |
b5d0b9df | 173 | state->limit = disk_max_parts(hd); |
57881dd9 | 174 | i = res = err = 0; |
1da177e4 LT |
175 | while (!res && check_part[i]) { |
176 | memset(&state->parts, 0, sizeof(state->parts)); | |
177 | res = check_part[i++](state, bdev); | |
57881dd9 S |
178 | if (res < 0) { |
179 | /* We have hit an I/O error which we don't report now. | |
180 | * But record it, and let the others do their job. | |
181 | */ | |
182 | err = res; | |
183 | res = 0; | |
184 | } | |
185 | ||
1da177e4 LT |
186 | } |
187 | if (res > 0) | |
188 | return state; | |
9bebff6c | 189 | if (err) |
57881dd9 S |
190 | /* The partition is unrecognized. So report I/O errors if there were any */ |
191 | res = err; | |
1da177e4 LT |
192 | if (!res) |
193 | printk(" unknown partition table\n"); | |
194 | else if (warn_no_part) | |
195 | printk(" unable to read partition table\n"); | |
196 | kfree(state); | |
5127d002 | 197 | return ERR_PTR(res); |
1da177e4 LT |
198 | } |
199 | ||
0fc71e3d TH |
200 | static ssize_t part_partition_show(struct device *dev, |
201 | struct device_attribute *attr, char *buf) | |
202 | { | |
203 | struct hd_struct *p = dev_to_part(dev); | |
204 | ||
205 | return sprintf(buf, "%d\n", p->partno); | |
206 | } | |
207 | ||
edfaa7c3 KS |
208 | static ssize_t part_start_show(struct device *dev, |
209 | struct device_attribute *attr, char *buf) | |
1da177e4 | 210 | { |
edfaa7c3 | 211 | struct hd_struct *p = dev_to_part(dev); |
a7fd6706 | 212 | |
edfaa7c3 | 213 | return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect); |
1da177e4 LT |
214 | } |
215 | ||
e5610521 TH |
216 | ssize_t part_size_show(struct device *dev, |
217 | struct device_attribute *attr, char *buf) | |
a7fd6706 | 218 | { |
edfaa7c3 KS |
219 | struct hd_struct *p = dev_to_part(dev); |
220 | return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects); | |
a7fd6706 | 221 | } |
edfaa7c3 | 222 | |
c72758f3 MP |
223 | ssize_t part_alignment_offset_show(struct device *dev, |
224 | struct device_attribute *attr, char *buf) | |
225 | { | |
226 | struct hd_struct *p = dev_to_part(dev); | |
227 | return sprintf(buf, "%llu\n", (unsigned long long)p->alignment_offset); | |
228 | } | |
229 | ||
86b37281 MP |
230 | ssize_t part_discard_alignment_show(struct device *dev, |
231 | struct device_attribute *attr, char *buf) | |
232 | { | |
233 | struct hd_struct *p = dev_to_part(dev); | |
234 | return sprintf(buf, "%u\n", p->discard_alignment); | |
235 | } | |
236 | ||
074a7aca TH |
237 | ssize_t part_stat_show(struct device *dev, |
238 | struct device_attribute *attr, char *buf) | |
1da177e4 | 239 | { |
edfaa7c3 | 240 | struct hd_struct *p = dev_to_part(dev); |
c9959059 | 241 | int cpu; |
edfaa7c3 | 242 | |
074a7aca | 243 | cpu = part_stat_lock(); |
c9959059 | 244 | part_round_stats(cpu, p); |
074a7aca | 245 | part_stat_unlock(); |
34e8beac JM |
246 | return sprintf(buf, |
247 | "%8lu %8lu %8llu %8u " | |
248 | "%8lu %8lu %8llu %8u " | |
249 | "%8u %8u %8u" | |
250 | "\n", | |
251 | part_stat_read(p, ios[READ]), | |
252 | part_stat_read(p, merges[READ]), | |
253 | (unsigned long long)part_stat_read(p, sectors[READ]), | |
254 | jiffies_to_msecs(part_stat_read(p, ticks[READ])), | |
255 | part_stat_read(p, ios[WRITE]), | |
256 | part_stat_read(p, merges[WRITE]), | |
257 | (unsigned long long)part_stat_read(p, sectors[WRITE]), | |
258 | jiffies_to_msecs(part_stat_read(p, ticks[WRITE])), | |
316d315b | 259 | part_in_flight(p), |
34e8beac JM |
260 | jiffies_to_msecs(part_stat_read(p, io_ticks)), |
261 | jiffies_to_msecs(part_stat_read(p, time_in_queue))); | |
1da177e4 | 262 | } |
1da177e4 | 263 | |
316d315b NK |
264 | ssize_t part_inflight_show(struct device *dev, |
265 | struct device_attribute *attr, char *buf) | |
266 | { | |
267 | struct hd_struct *p = dev_to_part(dev); | |
268 | ||
269 | return sprintf(buf, "%8u %8u\n", p->in_flight[0], p->in_flight[1]); | |
270 | } | |
271 | ||
c17bb495 | 272 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
eddb2e26 TH |
273 | ssize_t part_fail_show(struct device *dev, |
274 | struct device_attribute *attr, char *buf) | |
edfaa7c3 KS |
275 | { |
276 | struct hd_struct *p = dev_to_part(dev); | |
c17bb495 | 277 | |
edfaa7c3 KS |
278 | return sprintf(buf, "%d\n", p->make_it_fail); |
279 | } | |
280 | ||
eddb2e26 TH |
281 | ssize_t part_fail_store(struct device *dev, |
282 | struct device_attribute *attr, | |
283 | const char *buf, size_t count) | |
c17bb495 | 284 | { |
edfaa7c3 | 285 | struct hd_struct *p = dev_to_part(dev); |
c17bb495 AM |
286 | int i; |
287 | ||
288 | if (count > 0 && sscanf(buf, "%d", &i) > 0) | |
289 | p->make_it_fail = (i == 0) ? 0 : 1; | |
290 | ||
291 | return count; | |
292 | } | |
edfaa7c3 | 293 | #endif |
c17bb495 | 294 | |
0fc71e3d | 295 | static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL); |
edfaa7c3 KS |
296 | static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL); |
297 | static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL); | |
c72758f3 | 298 | static DEVICE_ATTR(alignment_offset, S_IRUGO, part_alignment_offset_show, NULL); |
86b37281 MP |
299 | static DEVICE_ATTR(discard_alignment, S_IRUGO, part_discard_alignment_show, |
300 | NULL); | |
edfaa7c3 | 301 | static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL); |
316d315b | 302 | static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL); |
edfaa7c3 KS |
303 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
304 | static struct device_attribute dev_attr_fail = | |
305 | __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store); | |
c17bb495 AM |
306 | #endif |
307 | ||
edfaa7c3 | 308 | static struct attribute *part_attrs[] = { |
0fc71e3d | 309 | &dev_attr_partition.attr, |
edfaa7c3 KS |
310 | &dev_attr_start.attr, |
311 | &dev_attr_size.attr, | |
c72758f3 | 312 | &dev_attr_alignment_offset.attr, |
86b37281 | 313 | &dev_attr_discard_alignment.attr, |
edfaa7c3 | 314 | &dev_attr_stat.attr, |
316d315b | 315 | &dev_attr_inflight.attr, |
c17bb495 | 316 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 | 317 | &dev_attr_fail.attr, |
c17bb495 | 318 | #endif |
edfaa7c3 | 319 | NULL |
1da177e4 LT |
320 | }; |
321 | ||
edfaa7c3 KS |
322 | static struct attribute_group part_attr_group = { |
323 | .attrs = part_attrs, | |
324 | }; | |
1da177e4 | 325 | |
a4dbd674 | 326 | static const struct attribute_group *part_attr_groups[] = { |
edfaa7c3 | 327 | &part_attr_group, |
c71a8961 ACM |
328 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
329 | &blk_trace_attr_group, | |
330 | #endif | |
edfaa7c3 KS |
331 | NULL |
332 | }; | |
333 | ||
334 | static void part_release(struct device *dev) | |
1da177e4 | 335 | { |
edfaa7c3 | 336 | struct hd_struct *p = dev_to_part(dev); |
6f2576af | 337 | free_part_stats(p); |
1da177e4 LT |
338 | kfree(p); |
339 | } | |
340 | ||
edfaa7c3 KS |
341 | struct device_type part_type = { |
342 | .name = "partition", | |
343 | .groups = part_attr_groups, | |
1da177e4 | 344 | .release = part_release, |
1da177e4 LT |
345 | }; |
346 | ||
e71bf0d0 TH |
347 | static void delete_partition_rcu_cb(struct rcu_head *head) |
348 | { | |
349 | struct hd_struct *part = container_of(head, struct hd_struct, rcu_head); | |
350 | ||
351 | part->start_sect = 0; | |
352 | part->nr_sects = 0; | |
353 | part_stat_set_all(part, 0); | |
ed9e1982 | 354 | put_device(part_to_dev(part)); |
e71bf0d0 TH |
355 | } |
356 | ||
cf771cb5 | 357 | void delete_partition(struct gendisk *disk, int partno) |
1da177e4 | 358 | { |
540eed56 | 359 | struct disk_part_tbl *ptbl = disk->part_tbl; |
e71bf0d0 | 360 | struct hd_struct *part; |
edfaa7c3 | 361 | |
540eed56 TH |
362 | if (partno >= ptbl->len) |
363 | return; | |
364 | ||
365 | part = ptbl->part[partno]; | |
e71bf0d0 | 366 | if (!part) |
1da177e4 | 367 | return; |
e71bf0d0 | 368 | |
bcce3de1 | 369 | blk_free_devt(part_devt(part)); |
540eed56 | 370 | rcu_assign_pointer(ptbl->part[partno], NULL); |
54b0d127 | 371 | rcu_assign_pointer(ptbl->last_lookup, NULL); |
e71bf0d0 | 372 | kobject_put(part->holder_dir); |
ed9e1982 | 373 | device_del(part_to_dev(part)); |
e71bf0d0 TH |
374 | |
375 | call_rcu(&part->rcu_head, delete_partition_rcu_cb); | |
1da177e4 LT |
376 | } |
377 | ||
f4a00a2c GKH |
378 | static ssize_t whole_disk_show(struct device *dev, |
379 | struct device_attribute *attr, char *buf) | |
380 | { | |
381 | return 0; | |
382 | } | |
383 | static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH, | |
384 | whole_disk_show, NULL); | |
385 | ||
ba32929a TH |
386 | struct hd_struct *add_partition(struct gendisk *disk, int partno, |
387 | sector_t start, sector_t len, int flags) | |
1da177e4 LT |
388 | { |
389 | struct hd_struct *p; | |
bcce3de1 | 390 | dev_t devt = MKDEV(0, 0); |
ed9e1982 TH |
391 | struct device *ddev = disk_to_dev(disk); |
392 | struct device *pdev; | |
540eed56 | 393 | struct disk_part_tbl *ptbl; |
ed9e1982 | 394 | const char *dname; |
edfaa7c3 | 395 | int err; |
1da177e4 | 396 | |
540eed56 TH |
397 | err = disk_expand_part_tbl(disk, partno); |
398 | if (err) | |
ba32929a | 399 | return ERR_PTR(err); |
540eed56 TH |
400 | ptbl = disk->part_tbl; |
401 | ||
402 | if (ptbl->part[partno]) | |
ba32929a | 403 | return ERR_PTR(-EBUSY); |
88e34126 | 404 | |
dd00cc48 | 405 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
1da177e4 | 406 | if (!p) |
ba32929a | 407 | return ERR_PTR(-EBUSY); |
edfaa7c3 | 408 | |
6f2576af | 409 | if (!init_part_stats(p)) { |
d805dda4 | 410 | err = -ENOMEM; |
88e34126 | 411 | goto out_free; |
6f2576af | 412 | } |
ed9e1982 TH |
413 | pdev = part_to_dev(p); |
414 | ||
1da177e4 | 415 | p->start_sect = start; |
e03a72e1 MP |
416 | p->alignment_offset = |
417 | queue_limit_alignment_offset(&disk->queue->limits, start); | |
418 | p->discard_alignment = | |
419 | queue_limit_discard_alignment(&disk->queue->limits, start); | |
1da177e4 | 420 | p->nr_sects = len; |
cf771cb5 | 421 | p->partno = partno; |
b7db9956 | 422 | p->policy = get_disk_ro(disk); |
1da177e4 | 423 | |
ed9e1982 TH |
424 | dname = dev_name(ddev); |
425 | if (isdigit(dname[strlen(dname) - 1])) | |
3ada8b7e | 426 | dev_set_name(pdev, "%sp%d", dname, partno); |
1da177e4 | 427 | else |
3ada8b7e | 428 | dev_set_name(pdev, "%s%d", dname, partno); |
edfaa7c3 | 429 | |
ed9e1982 TH |
430 | device_initialize(pdev); |
431 | pdev->class = &block_class; | |
432 | pdev->type = &part_type; | |
433 | pdev->parent = ddev; | |
edfaa7c3 | 434 | |
bcce3de1 TH |
435 | err = blk_alloc_devt(p, &devt); |
436 | if (err) | |
eb60fa10 | 437 | goto out_free_stats; |
ed9e1982 | 438 | pdev->devt = devt; |
bcce3de1 | 439 | |
edfaa7c3 | 440 | /* delay uevent until 'holders' subdir is created */ |
f67f129e | 441 | dev_set_uevent_suppress(pdev, 1); |
ed9e1982 | 442 | err = device_add(pdev); |
d805dda4 | 443 | if (err) |
88e34126 TH |
444 | goto out_put; |
445 | ||
446 | err = -ENOMEM; | |
ed9e1982 | 447 | p->holder_dir = kobject_create_and_add("holders", &pdev->kobj); |
88e34126 TH |
448 | if (!p->holder_dir) |
449 | goto out_del; | |
450 | ||
f67f129e | 451 | dev_set_uevent_suppress(pdev, 0); |
d805dda4 | 452 | if (flags & ADDPART_FLAG_WHOLEDISK) { |
ed9e1982 | 453 | err = device_create_file(pdev, &dev_attr_whole_disk); |
d805dda4 | 454 | if (err) |
88e34126 | 455 | goto out_del; |
d805dda4 | 456 | } |
1da177e4 | 457 | |
88e34126 | 458 | /* everything is up and running, commence */ |
e71bf0d0 | 459 | INIT_RCU_HEAD(&p->rcu_head); |
540eed56 | 460 | rcu_assign_pointer(ptbl->part[partno], p); |
88e34126 | 461 | |
edfaa7c3 | 462 | /* suppress uevent if the disk supresses it */ |
f8c73c79 | 463 | if (!dev_get_uevent_suppress(ddev)) |
ed9e1982 | 464 | kobject_uevent(&pdev->kobj, KOBJ_ADD); |
d805dda4 | 465 | |
ba32929a | 466 | return p; |
d805dda4 | 467 | |
eb60fa10 TH |
468 | out_free_stats: |
469 | free_part_stats(p); | |
88e34126 TH |
470 | out_free: |
471 | kfree(p); | |
ba32929a | 472 | return ERR_PTR(err); |
88e34126 TH |
473 | out_del: |
474 | kobject_put(p->holder_dir); | |
ed9e1982 | 475 | device_del(pdev); |
88e34126 | 476 | out_put: |
ed9e1982 | 477 | put_device(pdev); |
bcce3de1 | 478 | blk_free_devt(devt); |
ba32929a | 479 | return ERR_PTR(err); |
1da177e4 LT |
480 | } |
481 | ||
482 | /* Not exported, helper to add_disk(). */ | |
483 | void register_disk(struct gendisk *disk) | |
484 | { | |
ed9e1982 | 485 | struct device *ddev = disk_to_dev(disk); |
1da177e4 | 486 | struct block_device *bdev; |
e71bf0d0 TH |
487 | struct disk_part_iter piter; |
488 | struct hd_struct *part; | |
1da177e4 LT |
489 | int err; |
490 | ||
ed9e1982 | 491 | ddev->parent = disk->driverfs_dev; |
edfaa7c3 | 492 | |
3ada8b7e | 493 | dev_set_name(ddev, disk->disk_name); |
edfaa7c3 KS |
494 | |
495 | /* delay uevents, until we scanned partition table */ | |
f67f129e | 496 | dev_set_uevent_suppress(ddev, 1); |
edfaa7c3 | 497 | |
ed9e1982 | 498 | if (device_add(ddev)) |
1da177e4 | 499 | return; |
edfaa7c3 | 500 | #ifndef CONFIG_SYSFS_DEPRECATED |
ed9e1982 TH |
501 | err = sysfs_create_link(block_depr, &ddev->kobj, |
502 | kobject_name(&ddev->kobj)); | |
eee44cca | 503 | if (err) { |
ed9e1982 | 504 | device_del(ddev); |
eee44cca JG |
505 | return; |
506 | } | |
edfaa7c3 | 507 | #endif |
4c46501d TH |
508 | disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj); |
509 | disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj); | |
1da177e4 LT |
510 | |
511 | /* No minors to use for partitions */ | |
b5d0b9df | 512 | if (!disk_partitionable(disk)) |
d4d7e5df | 513 | goto exit; |
1da177e4 LT |
514 | |
515 | /* No such device (e.g., media were just removed) */ | |
516 | if (!get_capacity(disk)) | |
d4d7e5df | 517 | goto exit; |
1da177e4 LT |
518 | |
519 | bdev = bdget_disk(disk, 0); | |
520 | if (!bdev) | |
d4d7e5df | 521 | goto exit; |
1da177e4 LT |
522 | |
523 | bdev->bd_invalidated = 1; | |
572c4892 | 524 | err = blkdev_get(bdev, FMODE_READ); |
d4d7e5df KS |
525 | if (err < 0) |
526 | goto exit; | |
9a1c3542 | 527 | blkdev_put(bdev, FMODE_READ); |
d4d7e5df KS |
528 | |
529 | exit: | |
edfaa7c3 | 530 | /* announce disk after possible partitions are created */ |
f67f129e | 531 | dev_set_uevent_suppress(ddev, 0); |
ed9e1982 | 532 | kobject_uevent(&ddev->kobj, KOBJ_ADD); |
d4d7e5df KS |
533 | |
534 | /* announce possible partitions */ | |
e71bf0d0 TH |
535 | disk_part_iter_init(&piter, disk, 0); |
536 | while ((part = disk_part_iter_next(&piter))) | |
ed9e1982 | 537 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD); |
e71bf0d0 | 538 | disk_part_iter_exit(&piter); |
1da177e4 LT |
539 | } |
540 | ||
541 | int rescan_partitions(struct gendisk *disk, struct block_device *bdev) | |
542 | { | |
e71bf0d0 TH |
543 | struct disk_part_iter piter; |
544 | struct hd_struct *part; | |
1da177e4 | 545 | struct parsed_partitions *state; |
540eed56 | 546 | int p, highest, res; |
1da177e4 LT |
547 | |
548 | if (bdev->bd_part_count) | |
549 | return -EBUSY; | |
550 | res = invalidate_partition(disk, 0); | |
551 | if (res) | |
552 | return res; | |
e71bf0d0 TH |
553 | |
554 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); | |
555 | while ((part = disk_part_iter_next(&piter))) | |
556 | delete_partition(disk, part->partno); | |
557 | disk_part_iter_exit(&piter); | |
558 | ||
1da177e4 LT |
559 | if (disk->fops->revalidate_disk) |
560 | disk->fops->revalidate_disk(disk); | |
9bc3ffbf AP |
561 | check_disk_size_change(disk, bdev); |
562 | bdev->bd_invalidated = 0; | |
1da177e4 LT |
563 | if (!get_capacity(disk) || !(state = check_partition(disk, bdev))) |
564 | return 0; | |
5127d002 | 565 | if (IS_ERR(state)) /* I/O error reading the partition table */ |
b74a2f09 | 566 | return -EIO; |
6bcf19d0 KS |
567 | |
568 | /* tell userspace that the media / partition table may have changed */ | |
ed9e1982 | 569 | kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); |
6bcf19d0 | 570 | |
540eed56 TH |
571 | /* Detect the highest partition number and preallocate |
572 | * disk->part_tbl. This is an optimization and not strictly | |
573 | * necessary. | |
574 | */ | |
575 | for (p = 1, highest = 0; p < state->limit; p++) | |
576 | if (state->parts[p].size) | |
577 | highest = p; | |
578 | ||
579 | disk_expand_part_tbl(disk, highest); | |
580 | ||
581 | /* add partitions */ | |
1da177e4 | 582 | for (p = 1; p < state->limit; p++) { |
db429e9e BZ |
583 | sector_t size, from; |
584 | try_scan: | |
585 | size = state->parts[p].size; | |
1da177e4 LT |
586 | if (!size) |
587 | continue; | |
db429e9e BZ |
588 | |
589 | from = state->parts[p].from; | |
ac0d86f5 KS |
590 | if (from >= get_capacity(disk)) { |
591 | printk(KERN_WARNING | |
592 | "%s: p%d ignored, start %llu is behind the end of the disk\n", | |
593 | disk->disk_name, p, (unsigned long long) from); | |
594 | continue; | |
595 | } | |
db429e9e | 596 | |
98bd34ea | 597 | if (from + size > get_capacity(disk)) { |
83d5cde4 | 598 | const struct block_device_operations *bdops = disk->fops; |
db429e9e BZ |
599 | unsigned long long capacity; |
600 | ||
8d99f83b | 601 | printk(KERN_WARNING |
db429e9e | 602 | "%s: p%d size %llu exceeds device capacity, ", |
ac0d86f5 | 603 | disk->disk_name, p, (unsigned long long) size); |
db429e9e BZ |
604 | |
605 | if (bdops->set_capacity && | |
606 | (disk->flags & GENHD_FL_NATIVE_CAPACITY) == 0) { | |
607 | printk(KERN_CONT "enabling native capacity\n"); | |
608 | capacity = bdops->set_capacity(disk, ~0ULL); | |
609 | disk->flags |= GENHD_FL_NATIVE_CAPACITY; | |
610 | if (capacity > get_capacity(disk)) { | |
611 | set_capacity(disk, capacity); | |
612 | check_disk_size_change(disk, bdev); | |
613 | bdev->bd_invalidated = 0; | |
614 | } | |
615 | goto try_scan; | |
616 | } else { | |
617 | /* | |
618 | * we can not ignore partitions of broken tables | |
619 | * created by for example camera firmware, but | |
620 | * we limit them to the end of the disk to avoid | |
621 | * creating invalid block devices | |
622 | */ | |
623 | printk(KERN_CONT "limited to end of disk\n"); | |
624 | size = get_capacity(disk) - from; | |
625 | } | |
04ebd4ae | 626 | } |
ba32929a TH |
627 | part = add_partition(disk, p, from, size, |
628 | state->parts[p].flags); | |
629 | if (IS_ERR(part)) { | |
630 | printk(KERN_ERR " %s: p%d could not be added: %ld\n", | |
631 | disk->disk_name, p, -PTR_ERR(part)); | |
04ebd4ae | 632 | continue; |
98bd34ea | 633 | } |
1da177e4 | 634 | #ifdef CONFIG_BLK_DEV_MD |
d18d7682 | 635 | if (state->parts[p].flags & ADDPART_FLAG_RAID) |
55e8e30c | 636 | md_autodetect_dev(part_to_dev(part)->devt); |
1da177e4 LT |
637 | #endif |
638 | } | |
639 | kfree(state); | |
640 | return 0; | |
641 | } | |
642 | ||
643 | unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p) | |
644 | { | |
645 | struct address_space *mapping = bdev->bd_inode->i_mapping; | |
646 | struct page *page; | |
647 | ||
090d2b18 PE |
648 | page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)), |
649 | NULL); | |
1da177e4 | 650 | if (!IS_ERR(page)) { |
1da177e4 LT |
651 | if (PageError(page)) |
652 | goto fail; | |
653 | p->v = page; | |
654 | return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9); | |
655 | fail: | |
656 | page_cache_release(page); | |
657 | } | |
658 | p->v = NULL; | |
659 | return NULL; | |
660 | } | |
661 | ||
662 | EXPORT_SYMBOL(read_dev_sector); | |
663 | ||
664 | void del_gendisk(struct gendisk *disk) | |
665 | { | |
e71bf0d0 TH |
666 | struct disk_part_iter piter; |
667 | struct hd_struct *part; | |
1da177e4 LT |
668 | |
669 | /* invalidate stuff */ | |
e71bf0d0 TH |
670 | disk_part_iter_init(&piter, disk, |
671 | DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE); | |
672 | while ((part = disk_part_iter_next(&piter))) { | |
673 | invalidate_partition(disk, part->partno); | |
674 | delete_partition(disk, part->partno); | |
1da177e4 | 675 | } |
e71bf0d0 TH |
676 | disk_part_iter_exit(&piter); |
677 | ||
1da177e4 | 678 | invalidate_partition(disk, 0); |
3e1a7ff8 | 679 | blk_free_devt(disk_to_dev(disk)->devt); |
80795aef | 680 | set_capacity(disk, 0); |
1da177e4 LT |
681 | disk->flags &= ~GENHD_FL_UP; |
682 | unlink_gendisk(disk); | |
074a7aca TH |
683 | part_stat_set_all(&disk->part0, 0); |
684 | disk->part0.stamp = 0; | |
1da177e4 | 685 | |
4c46501d | 686 | kobject_put(disk->part0.holder_dir); |
197b12d6 | 687 | kobject_put(disk->slave_dir); |
edfaa7c3 KS |
688 | disk->driverfs_dev = NULL; |
689 | #ifndef CONFIG_SYSFS_DEPRECATED | |
ed9e1982 | 690 | sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk))); |
edfaa7c3 | 691 | #endif |
ed9e1982 | 692 | device_del(disk_to_dev(disk)); |
1da177e4 | 693 | } |