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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 | ||
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); | |
a1706ac4 | 258 | return sprintf(buf, "%u\n", p->discard_alignment); |
86b37281 MP |
259 | } |
260 | ||
074a7aca TH |
261 | ssize_t part_stat_show(struct device *dev, |
262 | struct device_attribute *attr, char *buf) | |
1da177e4 | 263 | { |
edfaa7c3 | 264 | struct hd_struct *p = dev_to_part(dev); |
c9959059 | 265 | int cpu; |
edfaa7c3 | 266 | |
074a7aca | 267 | cpu = part_stat_lock(); |
c9959059 | 268 | part_round_stats(cpu, p); |
074a7aca | 269 | part_stat_unlock(); |
34e8beac JM |
270 | return sprintf(buf, |
271 | "%8lu %8lu %8llu %8u " | |
272 | "%8lu %8lu %8llu %8u " | |
273 | "%8u %8u %8u" | |
274 | "\n", | |
275 | part_stat_read(p, ios[READ]), | |
276 | part_stat_read(p, merges[READ]), | |
277 | (unsigned long long)part_stat_read(p, sectors[READ]), | |
278 | jiffies_to_msecs(part_stat_read(p, ticks[READ])), | |
279 | part_stat_read(p, ios[WRITE]), | |
280 | part_stat_read(p, merges[WRITE]), | |
281 | (unsigned long long)part_stat_read(p, sectors[WRITE]), | |
282 | jiffies_to_msecs(part_stat_read(p, ticks[WRITE])), | |
316d315b | 283 | part_in_flight(p), |
34e8beac JM |
284 | jiffies_to_msecs(part_stat_read(p, io_ticks)), |
285 | jiffies_to_msecs(part_stat_read(p, time_in_queue))); | |
1da177e4 | 286 | } |
1da177e4 | 287 | |
316d315b NK |
288 | ssize_t part_inflight_show(struct device *dev, |
289 | struct device_attribute *attr, char *buf) | |
290 | { | |
291 | struct hd_struct *p = dev_to_part(dev); | |
292 | ||
1e9bb880 SL |
293 | return sprintf(buf, "%8u %8u\n", atomic_read(&p->in_flight[0]), |
294 | atomic_read(&p->in_flight[1])); | |
316d315b NK |
295 | } |
296 | ||
c17bb495 | 297 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
eddb2e26 TH |
298 | ssize_t part_fail_show(struct device *dev, |
299 | struct device_attribute *attr, char *buf) | |
edfaa7c3 KS |
300 | { |
301 | struct hd_struct *p = dev_to_part(dev); | |
c17bb495 | 302 | |
edfaa7c3 KS |
303 | return sprintf(buf, "%d\n", p->make_it_fail); |
304 | } | |
305 | ||
eddb2e26 TH |
306 | ssize_t part_fail_store(struct device *dev, |
307 | struct device_attribute *attr, | |
308 | const char *buf, size_t count) | |
c17bb495 | 309 | { |
edfaa7c3 | 310 | struct hd_struct *p = dev_to_part(dev); |
c17bb495 AM |
311 | int i; |
312 | ||
313 | if (count > 0 && sscanf(buf, "%d", &i) > 0) | |
314 | p->make_it_fail = (i == 0) ? 0 : 1; | |
315 | ||
316 | return count; | |
317 | } | |
edfaa7c3 | 318 | #endif |
c17bb495 | 319 | |
0fc71e3d | 320 | static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL); |
edfaa7c3 KS |
321 | static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL); |
322 | static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL); | |
34db1d59 | 323 | static DEVICE_ATTR(ro, S_IRUGO, part_ro_show, NULL); |
c72758f3 | 324 | static DEVICE_ATTR(alignment_offset, S_IRUGO, part_alignment_offset_show, NULL); |
86b37281 MP |
325 | static DEVICE_ATTR(discard_alignment, S_IRUGO, part_discard_alignment_show, |
326 | NULL); | |
edfaa7c3 | 327 | static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL); |
316d315b | 328 | static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL); |
edfaa7c3 KS |
329 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
330 | static struct device_attribute dev_attr_fail = | |
331 | __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store); | |
c17bb495 AM |
332 | #endif |
333 | ||
edfaa7c3 | 334 | static struct attribute *part_attrs[] = { |
0fc71e3d | 335 | &dev_attr_partition.attr, |
edfaa7c3 KS |
336 | &dev_attr_start.attr, |
337 | &dev_attr_size.attr, | |
34db1d59 | 338 | &dev_attr_ro.attr, |
c72758f3 | 339 | &dev_attr_alignment_offset.attr, |
86b37281 | 340 | &dev_attr_discard_alignment.attr, |
edfaa7c3 | 341 | &dev_attr_stat.attr, |
316d315b | 342 | &dev_attr_inflight.attr, |
c17bb495 | 343 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 | 344 | &dev_attr_fail.attr, |
c17bb495 | 345 | #endif |
edfaa7c3 | 346 | NULL |
1da177e4 LT |
347 | }; |
348 | ||
edfaa7c3 KS |
349 | static struct attribute_group part_attr_group = { |
350 | .attrs = part_attrs, | |
351 | }; | |
1da177e4 | 352 | |
a4dbd674 | 353 | static const struct attribute_group *part_attr_groups[] = { |
edfaa7c3 | 354 | &part_attr_group, |
c71a8961 ACM |
355 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
356 | &blk_trace_attr_group, | |
357 | #endif | |
edfaa7c3 KS |
358 | NULL |
359 | }; | |
360 | ||
361 | static void part_release(struct device *dev) | |
1da177e4 | 362 | { |
edfaa7c3 | 363 | struct hd_struct *p = dev_to_part(dev); |
6f2576af | 364 | free_part_stats(p); |
6d1d8050 | 365 | free_part_info(p); |
1da177e4 LT |
366 | kfree(p); |
367 | } | |
368 | ||
edfaa7c3 KS |
369 | struct device_type part_type = { |
370 | .name = "partition", | |
371 | .groups = part_attr_groups, | |
1da177e4 | 372 | .release = part_release, |
1da177e4 LT |
373 | }; |
374 | ||
e71bf0d0 TH |
375 | static void delete_partition_rcu_cb(struct rcu_head *head) |
376 | { | |
377 | struct hd_struct *part = container_of(head, struct hd_struct, rcu_head); | |
378 | ||
379 | part->start_sect = 0; | |
380 | part->nr_sects = 0; | |
381 | part_stat_set_all(part, 0); | |
ed9e1982 | 382 | put_device(part_to_dev(part)); |
e71bf0d0 TH |
383 | } |
384 | ||
6c23a968 | 385 | void __delete_partition(struct hd_struct *part) |
09e099d4 | 386 | { |
09e099d4 JM |
387 | call_rcu(&part->rcu_head, delete_partition_rcu_cb); |
388 | } | |
389 | ||
cf771cb5 | 390 | void delete_partition(struct gendisk *disk, int partno) |
1da177e4 | 391 | { |
540eed56 | 392 | struct disk_part_tbl *ptbl = disk->part_tbl; |
e71bf0d0 | 393 | struct hd_struct *part; |
edfaa7c3 | 394 | |
540eed56 TH |
395 | if (partno >= ptbl->len) |
396 | return; | |
397 | ||
398 | part = ptbl->part[partno]; | |
e71bf0d0 | 399 | if (!part) |
1da177e4 | 400 | return; |
e71bf0d0 | 401 | |
bcce3de1 | 402 | blk_free_devt(part_devt(part)); |
540eed56 | 403 | rcu_assign_pointer(ptbl->part[partno], NULL); |
54b0d127 | 404 | rcu_assign_pointer(ptbl->last_lookup, NULL); |
e71bf0d0 | 405 | kobject_put(part->holder_dir); |
ed9e1982 | 406 | device_del(part_to_dev(part)); |
e71bf0d0 | 407 | |
6c23a968 | 408 | hd_struct_put(part); |
1da177e4 LT |
409 | } |
410 | ||
f4a00a2c GKH |
411 | static ssize_t whole_disk_show(struct device *dev, |
412 | struct device_attribute *attr, char *buf) | |
413 | { | |
414 | return 0; | |
415 | } | |
416 | static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH, | |
417 | whole_disk_show, NULL); | |
418 | ||
ba32929a | 419 | struct hd_struct *add_partition(struct gendisk *disk, int partno, |
6d1d8050 WD |
420 | sector_t start, sector_t len, int flags, |
421 | struct partition_meta_info *info) | |
1da177e4 LT |
422 | { |
423 | struct hd_struct *p; | |
bcce3de1 | 424 | dev_t devt = MKDEV(0, 0); |
ed9e1982 TH |
425 | struct device *ddev = disk_to_dev(disk); |
426 | struct device *pdev; | |
540eed56 | 427 | struct disk_part_tbl *ptbl; |
ed9e1982 | 428 | const char *dname; |
edfaa7c3 | 429 | int err; |
1da177e4 | 430 | |
540eed56 TH |
431 | err = disk_expand_part_tbl(disk, partno); |
432 | if (err) | |
ba32929a | 433 | return ERR_PTR(err); |
540eed56 TH |
434 | ptbl = disk->part_tbl; |
435 | ||
436 | if (ptbl->part[partno]) | |
ba32929a | 437 | return ERR_PTR(-EBUSY); |
88e34126 | 438 | |
dd00cc48 | 439 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
1da177e4 | 440 | if (!p) |
ba32929a | 441 | return ERR_PTR(-EBUSY); |
edfaa7c3 | 442 | |
6f2576af | 443 | if (!init_part_stats(p)) { |
d805dda4 | 444 | err = -ENOMEM; |
88e34126 | 445 | goto out_free; |
6f2576af | 446 | } |
ed9e1982 TH |
447 | pdev = part_to_dev(p); |
448 | ||
1da177e4 | 449 | p->start_sect = start; |
e03a72e1 MP |
450 | p->alignment_offset = |
451 | queue_limit_alignment_offset(&disk->queue->limits, start); | |
a1706ac4 JA |
452 | p->discard_alignment = |
453 | queue_limit_discard_alignment(&disk->queue->limits, start); | |
1da177e4 | 454 | p->nr_sects = len; |
cf771cb5 | 455 | p->partno = partno; |
b7db9956 | 456 | p->policy = get_disk_ro(disk); |
1da177e4 | 457 | |
6d1d8050 WD |
458 | if (info) { |
459 | struct partition_meta_info *pinfo = alloc_part_info(disk); | |
460 | if (!pinfo) | |
461 | goto out_free_stats; | |
462 | memcpy(pinfo, info, sizeof(*info)); | |
463 | p->info = pinfo; | |
464 | } | |
465 | ||
ed9e1982 TH |
466 | dname = dev_name(ddev); |
467 | if (isdigit(dname[strlen(dname) - 1])) | |
3ada8b7e | 468 | dev_set_name(pdev, "%sp%d", dname, partno); |
1da177e4 | 469 | else |
3ada8b7e | 470 | dev_set_name(pdev, "%s%d", dname, partno); |
edfaa7c3 | 471 | |
ed9e1982 TH |
472 | device_initialize(pdev); |
473 | pdev->class = &block_class; | |
474 | pdev->type = &part_type; | |
475 | pdev->parent = ddev; | |
edfaa7c3 | 476 | |
bcce3de1 TH |
477 | err = blk_alloc_devt(p, &devt); |
478 | if (err) | |
6d1d8050 | 479 | goto out_free_info; |
ed9e1982 | 480 | pdev->devt = devt; |
bcce3de1 | 481 | |
edfaa7c3 | 482 | /* delay uevent until 'holders' subdir is created */ |
f67f129e | 483 | dev_set_uevent_suppress(pdev, 1); |
ed9e1982 | 484 | err = device_add(pdev); |
d805dda4 | 485 | if (err) |
88e34126 TH |
486 | goto out_put; |
487 | ||
488 | err = -ENOMEM; | |
ed9e1982 | 489 | p->holder_dir = kobject_create_and_add("holders", &pdev->kobj); |
88e34126 TH |
490 | if (!p->holder_dir) |
491 | goto out_del; | |
492 | ||
f67f129e | 493 | dev_set_uevent_suppress(pdev, 0); |
d805dda4 | 494 | if (flags & ADDPART_FLAG_WHOLEDISK) { |
ed9e1982 | 495 | err = device_create_file(pdev, &dev_attr_whole_disk); |
d805dda4 | 496 | if (err) |
88e34126 | 497 | goto out_del; |
d805dda4 | 498 | } |
1da177e4 | 499 | |
88e34126 | 500 | /* everything is up and running, commence */ |
540eed56 | 501 | rcu_assign_pointer(ptbl->part[partno], p); |
88e34126 | 502 | |
25985edc | 503 | /* suppress uevent if the disk suppresses it */ |
f8c73c79 | 504 | if (!dev_get_uevent_suppress(ddev)) |
ed9e1982 | 505 | kobject_uevent(&pdev->kobj, KOBJ_ADD); |
d805dda4 | 506 | |
6c23a968 | 507 | hd_ref_init(p); |
ba32929a | 508 | return p; |
d805dda4 | 509 | |
6d1d8050 WD |
510 | out_free_info: |
511 | free_part_info(p); | |
eb60fa10 TH |
512 | out_free_stats: |
513 | free_part_stats(p); | |
88e34126 TH |
514 | out_free: |
515 | kfree(p); | |
ba32929a | 516 | return ERR_PTR(err); |
88e34126 TH |
517 | out_del: |
518 | kobject_put(p->holder_dir); | |
ed9e1982 | 519 | device_del(pdev); |
88e34126 | 520 | out_put: |
ed9e1982 | 521 | put_device(pdev); |
bcce3de1 | 522 | blk_free_devt(devt); |
ba32929a | 523 | return ERR_PTR(err); |
1da177e4 LT |
524 | } |
525 | ||
b403a98e TH |
526 | static bool disk_unlock_native_capacity(struct gendisk *disk) |
527 | { | |
528 | const struct block_device_operations *bdops = disk->fops; | |
529 | ||
530 | if (bdops->unlock_native_capacity && | |
531 | !(disk->flags & GENHD_FL_NATIVE_CAPACITY)) { | |
532 | printk(KERN_CONT "enabling native capacity\n"); | |
533 | bdops->unlock_native_capacity(disk); | |
534 | disk->flags |= GENHD_FL_NATIVE_CAPACITY; | |
535 | return true; | |
536 | } else { | |
537 | printk(KERN_CONT "truncated\n"); | |
538 | return false; | |
539 | } | |
540 | } | |
541 | ||
1da177e4 LT |
542 | int rescan_partitions(struct gendisk *disk, struct block_device *bdev) |
543 | { | |
b403a98e | 544 | struct parsed_partitions *state = NULL; |
e71bf0d0 TH |
545 | struct disk_part_iter piter; |
546 | struct hd_struct *part; | |
540eed56 | 547 | int p, highest, res; |
56bca017 | 548 | rescan: |
b403a98e TH |
549 | if (state && !IS_ERR(state)) { |
550 | kfree(state); | |
551 | state = NULL; | |
552 | } | |
553 | ||
1da177e4 LT |
554 | if (bdev->bd_part_count) |
555 | return -EBUSY; | |
556 | res = invalidate_partition(disk, 0); | |
557 | if (res) | |
558 | return res; | |
e71bf0d0 TH |
559 | |
560 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); | |
561 | while ((part = disk_part_iter_next(&piter))) | |
562 | delete_partition(disk, part->partno); | |
563 | disk_part_iter_exit(&piter); | |
564 | ||
1da177e4 LT |
565 | if (disk->fops->revalidate_disk) |
566 | disk->fops->revalidate_disk(disk); | |
9bc3ffbf AP |
567 | check_disk_size_change(disk, bdev); |
568 | bdev->bd_invalidated = 0; | |
1da177e4 LT |
569 | if (!get_capacity(disk) || !(state = check_partition(disk, bdev))) |
570 | return 0; | |
b403a98e TH |
571 | if (IS_ERR(state)) { |
572 | /* | |
573 | * I/O error reading the partition table. If any | |
574 | * partition code tried to read beyond EOD, retry | |
575 | * after unlocking native capacity. | |
576 | */ | |
577 | if (PTR_ERR(state) == -ENOSPC) { | |
578 | printk(KERN_WARNING "%s: partition table beyond EOD, ", | |
579 | disk->disk_name); | |
580 | if (disk_unlock_native_capacity(disk)) | |
581 | goto rescan; | |
582 | } | |
b74a2f09 | 583 | return -EIO; |
b403a98e TH |
584 | } |
585 | /* | |
586 | * If any partition code tried to read beyond EOD, try | |
587 | * unlocking native capacity even if partition table is | |
25985edc | 588 | * successfully read as we could be missing some partitions. |
b403a98e TH |
589 | */ |
590 | if (state->access_beyond_eod) { | |
591 | printk(KERN_WARNING | |
592 | "%s: partition table partially beyond EOD, ", | |
593 | disk->disk_name); | |
594 | if (disk_unlock_native_capacity(disk)) | |
595 | goto rescan; | |
596 | } | |
6bcf19d0 KS |
597 | |
598 | /* tell userspace that the media / partition table may have changed */ | |
ed9e1982 | 599 | kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); |
6bcf19d0 | 600 | |
540eed56 TH |
601 | /* Detect the highest partition number and preallocate |
602 | * disk->part_tbl. This is an optimization and not strictly | |
603 | * necessary. | |
604 | */ | |
605 | for (p = 1, highest = 0; p < state->limit; p++) | |
606 | if (state->parts[p].size) | |
607 | highest = p; | |
608 | ||
609 | disk_expand_part_tbl(disk, highest); | |
610 | ||
611 | /* add partitions */ | |
1da177e4 | 612 | for (p = 1; p < state->limit; p++) { |
db429e9e | 613 | sector_t size, from; |
6d1d8050 | 614 | struct partition_meta_info *info = NULL; |
56bca017 | 615 | |
db429e9e | 616 | size = state->parts[p].size; |
1da177e4 LT |
617 | if (!size) |
618 | continue; | |
db429e9e BZ |
619 | |
620 | from = state->parts[p].from; | |
ac0d86f5 KS |
621 | if (from >= get_capacity(disk)) { |
622 | printk(KERN_WARNING | |
b403a98e | 623 | "%s: p%d start %llu is beyond EOD, ", |
ac0d86f5 | 624 | disk->disk_name, p, (unsigned long long) from); |
b403a98e TH |
625 | if (disk_unlock_native_capacity(disk)) |
626 | goto rescan; | |
ac0d86f5 KS |
627 | continue; |
628 | } | |
db429e9e | 629 | |
98bd34ea | 630 | if (from + size > get_capacity(disk)) { |
8d99f83b | 631 | printk(KERN_WARNING |
b403a98e | 632 | "%s: p%d size %llu extends beyond EOD, ", |
ac0d86f5 | 633 | disk->disk_name, p, (unsigned long long) size); |
db429e9e | 634 | |
b403a98e | 635 | if (disk_unlock_native_capacity(disk)) { |
56bca017 | 636 | /* free state and restart */ |
56bca017 | 637 | goto rescan; |
db429e9e BZ |
638 | } else { |
639 | /* | |
640 | * we can not ignore partitions of broken tables | |
641 | * created by for example camera firmware, but | |
642 | * we limit them to the end of the disk to avoid | |
643 | * creating invalid block devices | |
644 | */ | |
db429e9e BZ |
645 | size = get_capacity(disk) - from; |
646 | } | |
04ebd4ae | 647 | } |
6d1d8050 WD |
648 | |
649 | if (state->parts[p].has_info) | |
650 | info = &state->parts[p].info; | |
ba32929a | 651 | part = add_partition(disk, p, from, size, |
6d1d8050 WD |
652 | state->parts[p].flags, |
653 | &state->parts[p].info); | |
ba32929a TH |
654 | if (IS_ERR(part)) { |
655 | printk(KERN_ERR " %s: p%d could not be added: %ld\n", | |
656 | disk->disk_name, p, -PTR_ERR(part)); | |
04ebd4ae | 657 | continue; |
98bd34ea | 658 | } |
1da177e4 | 659 | #ifdef CONFIG_BLK_DEV_MD |
d18d7682 | 660 | if (state->parts[p].flags & ADDPART_FLAG_RAID) |
55e8e30c | 661 | md_autodetect_dev(part_to_dev(part)->devt); |
1da177e4 LT |
662 | #endif |
663 | } | |
664 | kfree(state); | |
665 | return 0; | |
666 | } | |
667 | ||
668 | unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p) | |
669 | { | |
670 | struct address_space *mapping = bdev->bd_inode->i_mapping; | |
671 | struct page *page; | |
672 | ||
090d2b18 PE |
673 | page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)), |
674 | NULL); | |
1da177e4 | 675 | if (!IS_ERR(page)) { |
1da177e4 LT |
676 | if (PageError(page)) |
677 | goto fail; | |
678 | p->v = page; | |
679 | return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9); | |
680 | fail: | |
681 | page_cache_release(page); | |
682 | } | |
683 | p->v = NULL; | |
684 | return NULL; | |
685 | } | |
686 | ||
687 | EXPORT_SYMBOL(read_dev_sector); |