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> | |
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 | ||
1493bf21 | 48 | static int (*check_part[])(struct parsed_partitions *) = { |
1da177e4 LT |
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 | 163 | |
b403a98e | 164 | state = kzalloc(sizeof(struct parsed_partitions), GFP_KERNEL); |
1da177e4 LT |
165 | if (!state) |
166 | return NULL; | |
9c867fbe AD |
167 | state->pp_buf = (char *)__get_free_page(GFP_KERNEL); |
168 | if (!state->pp_buf) { | |
169 | kfree(state); | |
170 | return NULL; | |
171 | } | |
172 | state->pp_buf[0] = '\0'; | |
1da177e4 | 173 | |
1493bf21 | 174 | state->bdev = bdev; |
a2964188 | 175 | disk_name(hd, 0, state->name); |
9c867fbe | 176 | snprintf(state->pp_buf, PAGE_SIZE, " %s:", state->name); |
a2964188 | 177 | if (isdigit(state->name[strlen(state->name)-1])) |
1da177e4 | 178 | sprintf(state->name, "p"); |
a2964188 | 179 | |
b5d0b9df | 180 | state->limit = disk_max_parts(hd); |
57881dd9 | 181 | i = res = err = 0; |
1da177e4 LT |
182 | while (!res && check_part[i]) { |
183 | memset(&state->parts, 0, sizeof(state->parts)); | |
1493bf21 | 184 | res = check_part[i++](state); |
57881dd9 S |
185 | if (res < 0) { |
186 | /* We have hit an I/O error which we don't report now. | |
187 | * But record it, and let the others do their job. | |
188 | */ | |
189 | err = res; | |
190 | res = 0; | |
191 | } | |
192 | ||
1da177e4 | 193 | } |
9c867fbe AD |
194 | if (res > 0) { |
195 | printk(KERN_INFO "%s", state->pp_buf); | |
196 | ||
197 | free_page((unsigned long)state->pp_buf); | |
1da177e4 | 198 | return state; |
9c867fbe | 199 | } |
b403a98e TH |
200 | if (state->access_beyond_eod) |
201 | err = -ENOSPC; | |
9bebff6c | 202 | if (err) |
57881dd9 S |
203 | /* The partition is unrecognized. So report I/O errors if there were any */ |
204 | res = err; | |
1da177e4 | 205 | if (!res) |
9c867fbe | 206 | strlcat(state->pp_buf, " unknown partition table\n", PAGE_SIZE); |
1da177e4 | 207 | else if (warn_no_part) |
9c867fbe AD |
208 | strlcat(state->pp_buf, " unable to read partition table\n", PAGE_SIZE); |
209 | ||
210 | printk(KERN_INFO "%s", state->pp_buf); | |
211 | ||
212 | free_page((unsigned long)state->pp_buf); | |
1da177e4 | 213 | kfree(state); |
5127d002 | 214 | return ERR_PTR(res); |
1da177e4 LT |
215 | } |
216 | ||
0fc71e3d TH |
217 | static ssize_t part_partition_show(struct device *dev, |
218 | struct device_attribute *attr, char *buf) | |
219 | { | |
220 | struct hd_struct *p = dev_to_part(dev); | |
221 | ||
222 | return sprintf(buf, "%d\n", p->partno); | |
223 | } | |
224 | ||
edfaa7c3 KS |
225 | static ssize_t part_start_show(struct device *dev, |
226 | struct device_attribute *attr, char *buf) | |
1da177e4 | 227 | { |
edfaa7c3 | 228 | struct hd_struct *p = dev_to_part(dev); |
a7fd6706 | 229 | |
edfaa7c3 | 230 | return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect); |
1da177e4 LT |
231 | } |
232 | ||
e5610521 TH |
233 | ssize_t part_size_show(struct device *dev, |
234 | struct device_attribute *attr, char *buf) | |
a7fd6706 | 235 | { |
edfaa7c3 KS |
236 | struct hd_struct *p = dev_to_part(dev); |
237 | return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects); | |
a7fd6706 | 238 | } |
edfaa7c3 | 239 | |
34db1d59 KS |
240 | ssize_t part_ro_show(struct device *dev, |
241 | struct device_attribute *attr, char *buf) | |
242 | { | |
243 | struct hd_struct *p = dev_to_part(dev); | |
244 | return sprintf(buf, "%d\n", p->policy ? 1 : 0); | |
245 | } | |
246 | ||
c72758f3 MP |
247 | ssize_t part_alignment_offset_show(struct device *dev, |
248 | struct device_attribute *attr, char *buf) | |
249 | { | |
250 | struct hd_struct *p = dev_to_part(dev); | |
251 | return sprintf(buf, "%llu\n", (unsigned long long)p->alignment_offset); | |
252 | } | |
253 | ||
86b37281 MP |
254 | ssize_t part_discard_alignment_show(struct device *dev, |
255 | struct device_attribute *attr, char *buf) | |
256 | { | |
257 | struct hd_struct *p = dev_to_part(dev); | |
23ceb5b7 TM |
258 | struct gendisk *disk = dev_to_disk(dev); |
259 | ||
260 | return sprintf(buf, "%u\n", | |
261 | (unsigned long long)queue_limit_discard_alignment( | |
262 | &disk->queue->limits, | |
263 | p->start_sect)); | |
86b37281 MP |
264 | } |
265 | ||
074a7aca TH |
266 | ssize_t part_stat_show(struct device *dev, |
267 | struct device_attribute *attr, char *buf) | |
1da177e4 | 268 | { |
edfaa7c3 | 269 | struct hd_struct *p = dev_to_part(dev); |
c9959059 | 270 | int cpu; |
edfaa7c3 | 271 | |
074a7aca | 272 | cpu = part_stat_lock(); |
c9959059 | 273 | part_round_stats(cpu, p); |
074a7aca | 274 | part_stat_unlock(); |
34e8beac JM |
275 | return sprintf(buf, |
276 | "%8lu %8lu %8llu %8u " | |
277 | "%8lu %8lu %8llu %8u " | |
278 | "%8u %8u %8u" | |
279 | "\n", | |
280 | part_stat_read(p, ios[READ]), | |
281 | part_stat_read(p, merges[READ]), | |
282 | (unsigned long long)part_stat_read(p, sectors[READ]), | |
283 | jiffies_to_msecs(part_stat_read(p, ticks[READ])), | |
284 | part_stat_read(p, ios[WRITE]), | |
285 | part_stat_read(p, merges[WRITE]), | |
286 | (unsigned long long)part_stat_read(p, sectors[WRITE]), | |
287 | jiffies_to_msecs(part_stat_read(p, ticks[WRITE])), | |
316d315b | 288 | part_in_flight(p), |
34e8beac JM |
289 | jiffies_to_msecs(part_stat_read(p, io_ticks)), |
290 | jiffies_to_msecs(part_stat_read(p, time_in_queue))); | |
1da177e4 | 291 | } |
1da177e4 | 292 | |
316d315b NK |
293 | ssize_t part_inflight_show(struct device *dev, |
294 | struct device_attribute *attr, char *buf) | |
295 | { | |
296 | struct hd_struct *p = dev_to_part(dev); | |
297 | ||
1e9bb880 SL |
298 | return sprintf(buf, "%8u %8u\n", atomic_read(&p->in_flight[0]), |
299 | atomic_read(&p->in_flight[1])); | |
316d315b NK |
300 | } |
301 | ||
c17bb495 | 302 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
eddb2e26 TH |
303 | ssize_t part_fail_show(struct device *dev, |
304 | struct device_attribute *attr, char *buf) | |
edfaa7c3 KS |
305 | { |
306 | struct hd_struct *p = dev_to_part(dev); | |
c17bb495 | 307 | |
edfaa7c3 KS |
308 | return sprintf(buf, "%d\n", p->make_it_fail); |
309 | } | |
310 | ||
eddb2e26 TH |
311 | ssize_t part_fail_store(struct device *dev, |
312 | struct device_attribute *attr, | |
313 | const char *buf, size_t count) | |
c17bb495 | 314 | { |
edfaa7c3 | 315 | struct hd_struct *p = dev_to_part(dev); |
c17bb495 AM |
316 | int i; |
317 | ||
318 | if (count > 0 && sscanf(buf, "%d", &i) > 0) | |
319 | p->make_it_fail = (i == 0) ? 0 : 1; | |
320 | ||
321 | return count; | |
322 | } | |
edfaa7c3 | 323 | #endif |
c17bb495 | 324 | |
0fc71e3d | 325 | static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL); |
edfaa7c3 KS |
326 | static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL); |
327 | static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL); | |
34db1d59 | 328 | static DEVICE_ATTR(ro, S_IRUGO, part_ro_show, NULL); |
c72758f3 | 329 | static DEVICE_ATTR(alignment_offset, S_IRUGO, part_alignment_offset_show, NULL); |
86b37281 MP |
330 | static DEVICE_ATTR(discard_alignment, S_IRUGO, part_discard_alignment_show, |
331 | NULL); | |
edfaa7c3 | 332 | static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL); |
316d315b | 333 | static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL); |
edfaa7c3 KS |
334 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
335 | static struct device_attribute dev_attr_fail = | |
336 | __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store); | |
c17bb495 AM |
337 | #endif |
338 | ||
edfaa7c3 | 339 | static struct attribute *part_attrs[] = { |
0fc71e3d | 340 | &dev_attr_partition.attr, |
edfaa7c3 KS |
341 | &dev_attr_start.attr, |
342 | &dev_attr_size.attr, | |
34db1d59 | 343 | &dev_attr_ro.attr, |
c72758f3 | 344 | &dev_attr_alignment_offset.attr, |
86b37281 | 345 | &dev_attr_discard_alignment.attr, |
edfaa7c3 | 346 | &dev_attr_stat.attr, |
316d315b | 347 | &dev_attr_inflight.attr, |
c17bb495 | 348 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 | 349 | &dev_attr_fail.attr, |
c17bb495 | 350 | #endif |
edfaa7c3 | 351 | NULL |
1da177e4 LT |
352 | }; |
353 | ||
edfaa7c3 KS |
354 | static struct attribute_group part_attr_group = { |
355 | .attrs = part_attrs, | |
356 | }; | |
1da177e4 | 357 | |
a4dbd674 | 358 | static const struct attribute_group *part_attr_groups[] = { |
edfaa7c3 | 359 | &part_attr_group, |
c71a8961 ACM |
360 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
361 | &blk_trace_attr_group, | |
362 | #endif | |
edfaa7c3 KS |
363 | NULL |
364 | }; | |
365 | ||
366 | static void part_release(struct device *dev) | |
1da177e4 | 367 | { |
edfaa7c3 | 368 | struct hd_struct *p = dev_to_part(dev); |
6f2576af | 369 | free_part_stats(p); |
6d1d8050 | 370 | free_part_info(p); |
1da177e4 LT |
371 | kfree(p); |
372 | } | |
373 | ||
edfaa7c3 KS |
374 | struct device_type part_type = { |
375 | .name = "partition", | |
376 | .groups = part_attr_groups, | |
1da177e4 | 377 | .release = part_release, |
1da177e4 LT |
378 | }; |
379 | ||
e71bf0d0 TH |
380 | static void delete_partition_rcu_cb(struct rcu_head *head) |
381 | { | |
382 | struct hd_struct *part = container_of(head, struct hd_struct, rcu_head); | |
383 | ||
384 | part->start_sect = 0; | |
385 | part->nr_sects = 0; | |
386 | part_stat_set_all(part, 0); | |
ed9e1982 | 387 | put_device(part_to_dev(part)); |
e71bf0d0 TH |
388 | } |
389 | ||
6c23a968 | 390 | void __delete_partition(struct hd_struct *part) |
09e099d4 | 391 | { |
09e099d4 JM |
392 | call_rcu(&part->rcu_head, delete_partition_rcu_cb); |
393 | } | |
394 | ||
cf771cb5 | 395 | void delete_partition(struct gendisk *disk, int partno) |
1da177e4 | 396 | { |
540eed56 | 397 | struct disk_part_tbl *ptbl = disk->part_tbl; |
e71bf0d0 | 398 | struct hd_struct *part; |
edfaa7c3 | 399 | |
540eed56 TH |
400 | if (partno >= ptbl->len) |
401 | return; | |
402 | ||
403 | part = ptbl->part[partno]; | |
e71bf0d0 | 404 | if (!part) |
1da177e4 | 405 | return; |
e71bf0d0 | 406 | |
bcce3de1 | 407 | blk_free_devt(part_devt(part)); |
540eed56 | 408 | rcu_assign_pointer(ptbl->part[partno], NULL); |
54b0d127 | 409 | rcu_assign_pointer(ptbl->last_lookup, NULL); |
e71bf0d0 | 410 | kobject_put(part->holder_dir); |
ed9e1982 | 411 | device_del(part_to_dev(part)); |
e71bf0d0 | 412 | |
6c23a968 | 413 | hd_struct_put(part); |
1da177e4 LT |
414 | } |
415 | ||
f4a00a2c GKH |
416 | static ssize_t whole_disk_show(struct device *dev, |
417 | struct device_attribute *attr, char *buf) | |
418 | { | |
419 | return 0; | |
420 | } | |
421 | static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH, | |
422 | whole_disk_show, NULL); | |
423 | ||
ba32929a | 424 | struct hd_struct *add_partition(struct gendisk *disk, int partno, |
6d1d8050 WD |
425 | sector_t start, sector_t len, int flags, |
426 | struct partition_meta_info *info) | |
1da177e4 LT |
427 | { |
428 | struct hd_struct *p; | |
bcce3de1 | 429 | dev_t devt = MKDEV(0, 0); |
ed9e1982 TH |
430 | struct device *ddev = disk_to_dev(disk); |
431 | struct device *pdev; | |
540eed56 | 432 | struct disk_part_tbl *ptbl; |
ed9e1982 | 433 | const char *dname; |
edfaa7c3 | 434 | int err; |
1da177e4 | 435 | |
540eed56 TH |
436 | err = disk_expand_part_tbl(disk, partno); |
437 | if (err) | |
ba32929a | 438 | return ERR_PTR(err); |
540eed56 TH |
439 | ptbl = disk->part_tbl; |
440 | ||
441 | if (ptbl->part[partno]) | |
ba32929a | 442 | return ERR_PTR(-EBUSY); |
88e34126 | 443 | |
dd00cc48 | 444 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
1da177e4 | 445 | if (!p) |
ba32929a | 446 | return ERR_PTR(-EBUSY); |
edfaa7c3 | 447 | |
6f2576af | 448 | if (!init_part_stats(p)) { |
d805dda4 | 449 | err = -ENOMEM; |
88e34126 | 450 | goto out_free; |
6f2576af | 451 | } |
ed9e1982 TH |
452 | pdev = part_to_dev(p); |
453 | ||
1da177e4 | 454 | p->start_sect = start; |
e03a72e1 MP |
455 | p->alignment_offset = |
456 | queue_limit_alignment_offset(&disk->queue->limits, start); | |
1da177e4 | 457 | p->nr_sects = len; |
cf771cb5 | 458 | p->partno = partno; |
b7db9956 | 459 | p->policy = get_disk_ro(disk); |
1da177e4 | 460 | |
6d1d8050 WD |
461 | if (info) { |
462 | struct partition_meta_info *pinfo = alloc_part_info(disk); | |
463 | if (!pinfo) | |
464 | goto out_free_stats; | |
465 | memcpy(pinfo, info, sizeof(*info)); | |
466 | p->info = pinfo; | |
467 | } | |
468 | ||
ed9e1982 TH |
469 | dname = dev_name(ddev); |
470 | if (isdigit(dname[strlen(dname) - 1])) | |
3ada8b7e | 471 | dev_set_name(pdev, "%sp%d", dname, partno); |
1da177e4 | 472 | else |
3ada8b7e | 473 | dev_set_name(pdev, "%s%d", dname, partno); |
edfaa7c3 | 474 | |
ed9e1982 TH |
475 | device_initialize(pdev); |
476 | pdev->class = &block_class; | |
477 | pdev->type = &part_type; | |
478 | pdev->parent = ddev; | |
edfaa7c3 | 479 | |
bcce3de1 TH |
480 | err = blk_alloc_devt(p, &devt); |
481 | if (err) | |
6d1d8050 | 482 | goto out_free_info; |
ed9e1982 | 483 | pdev->devt = devt; |
bcce3de1 | 484 | |
edfaa7c3 | 485 | /* delay uevent until 'holders' subdir is created */ |
f67f129e | 486 | dev_set_uevent_suppress(pdev, 1); |
ed9e1982 | 487 | err = device_add(pdev); |
d805dda4 | 488 | if (err) |
88e34126 TH |
489 | goto out_put; |
490 | ||
491 | err = -ENOMEM; | |
ed9e1982 | 492 | p->holder_dir = kobject_create_and_add("holders", &pdev->kobj); |
88e34126 TH |
493 | if (!p->holder_dir) |
494 | goto out_del; | |
495 | ||
f67f129e | 496 | dev_set_uevent_suppress(pdev, 0); |
d805dda4 | 497 | if (flags & ADDPART_FLAG_WHOLEDISK) { |
ed9e1982 | 498 | err = device_create_file(pdev, &dev_attr_whole_disk); |
d805dda4 | 499 | if (err) |
88e34126 | 500 | goto out_del; |
d805dda4 | 501 | } |
1da177e4 | 502 | |
88e34126 | 503 | /* everything is up and running, commence */ |
540eed56 | 504 | rcu_assign_pointer(ptbl->part[partno], p); |
88e34126 | 505 | |
25985edc | 506 | /* suppress uevent if the disk suppresses it */ |
f8c73c79 | 507 | if (!dev_get_uevent_suppress(ddev)) |
ed9e1982 | 508 | kobject_uevent(&pdev->kobj, KOBJ_ADD); |
d805dda4 | 509 | |
6c23a968 | 510 | hd_ref_init(p); |
ba32929a | 511 | return p; |
d805dda4 | 512 | |
6d1d8050 WD |
513 | out_free_info: |
514 | free_part_info(p); | |
eb60fa10 TH |
515 | out_free_stats: |
516 | free_part_stats(p); | |
88e34126 TH |
517 | out_free: |
518 | kfree(p); | |
ba32929a | 519 | return ERR_PTR(err); |
88e34126 TH |
520 | out_del: |
521 | kobject_put(p->holder_dir); | |
ed9e1982 | 522 | device_del(pdev); |
88e34126 | 523 | out_put: |
ed9e1982 | 524 | put_device(pdev); |
bcce3de1 | 525 | blk_free_devt(devt); |
ba32929a | 526 | return ERR_PTR(err); |
1da177e4 LT |
527 | } |
528 | ||
b403a98e TH |
529 | static bool disk_unlock_native_capacity(struct gendisk *disk) |
530 | { | |
531 | const struct block_device_operations *bdops = disk->fops; | |
532 | ||
533 | if (bdops->unlock_native_capacity && | |
534 | !(disk->flags & GENHD_FL_NATIVE_CAPACITY)) { | |
535 | printk(KERN_CONT "enabling native capacity\n"); | |
536 | bdops->unlock_native_capacity(disk); | |
537 | disk->flags |= GENHD_FL_NATIVE_CAPACITY; | |
538 | return true; | |
539 | } else { | |
540 | printk(KERN_CONT "truncated\n"); | |
541 | return false; | |
542 | } | |
543 | } | |
544 | ||
1da177e4 LT |
545 | int rescan_partitions(struct gendisk *disk, struct block_device *bdev) |
546 | { | |
b403a98e | 547 | struct parsed_partitions *state = NULL; |
e71bf0d0 TH |
548 | struct disk_part_iter piter; |
549 | struct hd_struct *part; | |
540eed56 | 550 | int p, highest, res; |
56bca017 | 551 | rescan: |
b403a98e TH |
552 | if (state && !IS_ERR(state)) { |
553 | kfree(state); | |
554 | state = NULL; | |
555 | } | |
556 | ||
1da177e4 LT |
557 | if (bdev->bd_part_count) |
558 | return -EBUSY; | |
559 | res = invalidate_partition(disk, 0); | |
560 | if (res) | |
561 | return res; | |
e71bf0d0 TH |
562 | |
563 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); | |
564 | while ((part = disk_part_iter_next(&piter))) | |
565 | delete_partition(disk, part->partno); | |
566 | disk_part_iter_exit(&piter); | |
567 | ||
1da177e4 LT |
568 | if (disk->fops->revalidate_disk) |
569 | disk->fops->revalidate_disk(disk); | |
9bc3ffbf AP |
570 | check_disk_size_change(disk, bdev); |
571 | bdev->bd_invalidated = 0; | |
1da177e4 LT |
572 | if (!get_capacity(disk) || !(state = check_partition(disk, bdev))) |
573 | return 0; | |
b403a98e TH |
574 | if (IS_ERR(state)) { |
575 | /* | |
576 | * I/O error reading the partition table. If any | |
577 | * partition code tried to read beyond EOD, retry | |
578 | * after unlocking native capacity. | |
579 | */ | |
580 | if (PTR_ERR(state) == -ENOSPC) { | |
581 | printk(KERN_WARNING "%s: partition table beyond EOD, ", | |
582 | disk->disk_name); | |
583 | if (disk_unlock_native_capacity(disk)) | |
584 | goto rescan; | |
585 | } | |
b74a2f09 | 586 | return -EIO; |
b403a98e TH |
587 | } |
588 | /* | |
589 | * If any partition code tried to read beyond EOD, try | |
590 | * unlocking native capacity even if partition table is | |
25985edc | 591 | * successfully read as we could be missing some partitions. |
b403a98e TH |
592 | */ |
593 | if (state->access_beyond_eod) { | |
594 | printk(KERN_WARNING | |
595 | "%s: partition table partially beyond EOD, ", | |
596 | disk->disk_name); | |
597 | if (disk_unlock_native_capacity(disk)) | |
598 | goto rescan; | |
599 | } | |
6bcf19d0 KS |
600 | |
601 | /* tell userspace that the media / partition table may have changed */ | |
ed9e1982 | 602 | kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); |
6bcf19d0 | 603 | |
540eed56 TH |
604 | /* Detect the highest partition number and preallocate |
605 | * disk->part_tbl. This is an optimization and not strictly | |
606 | * necessary. | |
607 | */ | |
608 | for (p = 1, highest = 0; p < state->limit; p++) | |
609 | if (state->parts[p].size) | |
610 | highest = p; | |
611 | ||
612 | disk_expand_part_tbl(disk, highest); | |
613 | ||
614 | /* add partitions */ | |
1da177e4 | 615 | for (p = 1; p < state->limit; p++) { |
db429e9e | 616 | sector_t size, from; |
6d1d8050 | 617 | struct partition_meta_info *info = NULL; |
56bca017 | 618 | |
db429e9e | 619 | size = state->parts[p].size; |
1da177e4 LT |
620 | if (!size) |
621 | continue; | |
db429e9e BZ |
622 | |
623 | from = state->parts[p].from; | |
ac0d86f5 KS |
624 | if (from >= get_capacity(disk)) { |
625 | printk(KERN_WARNING | |
b403a98e | 626 | "%s: p%d start %llu is beyond EOD, ", |
ac0d86f5 | 627 | disk->disk_name, p, (unsigned long long) from); |
b403a98e TH |
628 | if (disk_unlock_native_capacity(disk)) |
629 | goto rescan; | |
ac0d86f5 KS |
630 | continue; |
631 | } | |
db429e9e | 632 | |
98bd34ea | 633 | if (from + size > get_capacity(disk)) { |
8d99f83b | 634 | printk(KERN_WARNING |
b403a98e | 635 | "%s: p%d size %llu extends beyond EOD, ", |
ac0d86f5 | 636 | disk->disk_name, p, (unsigned long long) size); |
db429e9e | 637 | |
b403a98e | 638 | if (disk_unlock_native_capacity(disk)) { |
56bca017 | 639 | /* free state and restart */ |
56bca017 | 640 | goto rescan; |
db429e9e BZ |
641 | } else { |
642 | /* | |
643 | * we can not ignore partitions of broken tables | |
644 | * created by for example camera firmware, but | |
645 | * we limit them to the end of the disk to avoid | |
646 | * creating invalid block devices | |
647 | */ | |
db429e9e BZ |
648 | size = get_capacity(disk) - from; |
649 | } | |
04ebd4ae | 650 | } |
6d1d8050 WD |
651 | |
652 | if (state->parts[p].has_info) | |
653 | info = &state->parts[p].info; | |
ba32929a | 654 | part = add_partition(disk, p, from, size, |
6d1d8050 WD |
655 | state->parts[p].flags, |
656 | &state->parts[p].info); | |
ba32929a TH |
657 | if (IS_ERR(part)) { |
658 | printk(KERN_ERR " %s: p%d could not be added: %ld\n", | |
659 | disk->disk_name, p, -PTR_ERR(part)); | |
04ebd4ae | 660 | continue; |
98bd34ea | 661 | } |
1da177e4 | 662 | #ifdef CONFIG_BLK_DEV_MD |
d18d7682 | 663 | if (state->parts[p].flags & ADDPART_FLAG_RAID) |
55e8e30c | 664 | md_autodetect_dev(part_to_dev(part)->devt); |
1da177e4 LT |
665 | #endif |
666 | } | |
667 | kfree(state); | |
668 | return 0; | |
669 | } | |
670 | ||
671 | unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p) | |
672 | { | |
673 | struct address_space *mapping = bdev->bd_inode->i_mapping; | |
674 | struct page *page; | |
675 | ||
090d2b18 PE |
676 | page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)), |
677 | NULL); | |
1da177e4 | 678 | if (!IS_ERR(page)) { |
1da177e4 LT |
679 | if (PageError(page)) |
680 | goto fail; | |
681 | p->v = page; | |
682 | return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9); | |
683 | fail: | |
684 | page_cache_release(page); | |
685 | } | |
686 | p->v = NULL; | |
687 | return NULL; | |
688 | } | |
689 | ||
690 | EXPORT_SYMBOL(read_dev_sector); |