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