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); | |
258 | return sprintf(buf, "%u\n", p->discard_alignment); | |
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 | ||
293 | return sprintf(buf, "%8u %8u\n", p->in_flight[0], p->in_flight[1]); | |
294 | } | |
295 | ||
c17bb495 | 296 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
eddb2e26 TH |
297 | ssize_t part_fail_show(struct device *dev, |
298 | struct device_attribute *attr, char *buf) | |
edfaa7c3 KS |
299 | { |
300 | struct hd_struct *p = dev_to_part(dev); | |
c17bb495 | 301 | |
edfaa7c3 KS |
302 | return sprintf(buf, "%d\n", p->make_it_fail); |
303 | } | |
304 | ||
eddb2e26 TH |
305 | ssize_t part_fail_store(struct device *dev, |
306 | struct device_attribute *attr, | |
307 | const char *buf, size_t count) | |
c17bb495 | 308 | { |
edfaa7c3 | 309 | struct hd_struct *p = dev_to_part(dev); |
c17bb495 AM |
310 | int i; |
311 | ||
312 | if (count > 0 && sscanf(buf, "%d", &i) > 0) | |
313 | p->make_it_fail = (i == 0) ? 0 : 1; | |
314 | ||
315 | return count; | |
316 | } | |
edfaa7c3 | 317 | #endif |
c17bb495 | 318 | |
0fc71e3d | 319 | static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL); |
edfaa7c3 KS |
320 | static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL); |
321 | static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL); | |
34db1d59 | 322 | static DEVICE_ATTR(ro, S_IRUGO, part_ro_show, NULL); |
c72758f3 | 323 | static DEVICE_ATTR(alignment_offset, S_IRUGO, part_alignment_offset_show, NULL); |
86b37281 MP |
324 | static DEVICE_ATTR(discard_alignment, S_IRUGO, part_discard_alignment_show, |
325 | NULL); | |
edfaa7c3 | 326 | static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL); |
316d315b | 327 | static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL); |
edfaa7c3 KS |
328 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
329 | static struct device_attribute dev_attr_fail = | |
330 | __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store); | |
c17bb495 AM |
331 | #endif |
332 | ||
edfaa7c3 | 333 | static struct attribute *part_attrs[] = { |
0fc71e3d | 334 | &dev_attr_partition.attr, |
edfaa7c3 KS |
335 | &dev_attr_start.attr, |
336 | &dev_attr_size.attr, | |
34db1d59 | 337 | &dev_attr_ro.attr, |
c72758f3 | 338 | &dev_attr_alignment_offset.attr, |
86b37281 | 339 | &dev_attr_discard_alignment.attr, |
edfaa7c3 | 340 | &dev_attr_stat.attr, |
316d315b | 341 | &dev_attr_inflight.attr, |
c17bb495 | 342 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 | 343 | &dev_attr_fail.attr, |
c17bb495 | 344 | #endif |
edfaa7c3 | 345 | NULL |
1da177e4 LT |
346 | }; |
347 | ||
edfaa7c3 KS |
348 | static struct attribute_group part_attr_group = { |
349 | .attrs = part_attrs, | |
350 | }; | |
1da177e4 | 351 | |
a4dbd674 | 352 | static const struct attribute_group *part_attr_groups[] = { |
edfaa7c3 | 353 | &part_attr_group, |
c71a8961 ACM |
354 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
355 | &blk_trace_attr_group, | |
356 | #endif | |
edfaa7c3 KS |
357 | NULL |
358 | }; | |
359 | ||
360 | static void part_release(struct device *dev) | |
1da177e4 | 361 | { |
edfaa7c3 | 362 | struct hd_struct *p = dev_to_part(dev); |
6f2576af | 363 | free_part_stats(p); |
1da177e4 LT |
364 | kfree(p); |
365 | } | |
366 | ||
edfaa7c3 KS |
367 | struct device_type part_type = { |
368 | .name = "partition", | |
369 | .groups = part_attr_groups, | |
1da177e4 | 370 | .release = part_release, |
1da177e4 LT |
371 | }; |
372 | ||
e71bf0d0 TH |
373 | static void delete_partition_rcu_cb(struct rcu_head *head) |
374 | { | |
375 | struct hd_struct *part = container_of(head, struct hd_struct, rcu_head); | |
376 | ||
377 | part->start_sect = 0; | |
378 | part->nr_sects = 0; | |
379 | part_stat_set_all(part, 0); | |
ed9e1982 | 380 | put_device(part_to_dev(part)); |
e71bf0d0 TH |
381 | } |
382 | ||
cf771cb5 | 383 | void delete_partition(struct gendisk *disk, int partno) |
1da177e4 | 384 | { |
540eed56 | 385 | struct disk_part_tbl *ptbl = disk->part_tbl; |
e71bf0d0 | 386 | struct hd_struct *part; |
edfaa7c3 | 387 | |
540eed56 TH |
388 | if (partno >= ptbl->len) |
389 | return; | |
390 | ||
391 | part = ptbl->part[partno]; | |
e71bf0d0 | 392 | if (!part) |
1da177e4 | 393 | return; |
e71bf0d0 | 394 | |
bcce3de1 | 395 | blk_free_devt(part_devt(part)); |
540eed56 | 396 | rcu_assign_pointer(ptbl->part[partno], NULL); |
54b0d127 | 397 | rcu_assign_pointer(ptbl->last_lookup, NULL); |
e71bf0d0 | 398 | kobject_put(part->holder_dir); |
ed9e1982 | 399 | device_del(part_to_dev(part)); |
e71bf0d0 TH |
400 | |
401 | call_rcu(&part->rcu_head, delete_partition_rcu_cb); | |
1da177e4 LT |
402 | } |
403 | ||
f4a00a2c GKH |
404 | static ssize_t whole_disk_show(struct device *dev, |
405 | struct device_attribute *attr, char *buf) | |
406 | { | |
407 | return 0; | |
408 | } | |
409 | static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH, | |
410 | whole_disk_show, NULL); | |
411 | ||
ba32929a TH |
412 | struct hd_struct *add_partition(struct gendisk *disk, int partno, |
413 | sector_t start, sector_t len, int flags) | |
1da177e4 LT |
414 | { |
415 | struct hd_struct *p; | |
bcce3de1 | 416 | dev_t devt = MKDEV(0, 0); |
ed9e1982 TH |
417 | struct device *ddev = disk_to_dev(disk); |
418 | struct device *pdev; | |
540eed56 | 419 | struct disk_part_tbl *ptbl; |
ed9e1982 | 420 | const char *dname; |
edfaa7c3 | 421 | int err; |
1da177e4 | 422 | |
540eed56 TH |
423 | err = disk_expand_part_tbl(disk, partno); |
424 | if (err) | |
ba32929a | 425 | return ERR_PTR(err); |
540eed56 TH |
426 | ptbl = disk->part_tbl; |
427 | ||
428 | if (ptbl->part[partno]) | |
ba32929a | 429 | return ERR_PTR(-EBUSY); |
88e34126 | 430 | |
dd00cc48 | 431 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
1da177e4 | 432 | if (!p) |
ba32929a | 433 | return ERR_PTR(-EBUSY); |
edfaa7c3 | 434 | |
6f2576af | 435 | if (!init_part_stats(p)) { |
d805dda4 | 436 | err = -ENOMEM; |
88e34126 | 437 | goto out_free; |
6f2576af | 438 | } |
ed9e1982 TH |
439 | pdev = part_to_dev(p); |
440 | ||
1da177e4 | 441 | p->start_sect = start; |
e03a72e1 MP |
442 | p->alignment_offset = |
443 | queue_limit_alignment_offset(&disk->queue->limits, start); | |
444 | p->discard_alignment = | |
445 | queue_limit_discard_alignment(&disk->queue->limits, start); | |
1da177e4 | 446 | p->nr_sects = len; |
cf771cb5 | 447 | p->partno = partno; |
b7db9956 | 448 | p->policy = get_disk_ro(disk); |
1da177e4 | 449 | |
ed9e1982 TH |
450 | dname = dev_name(ddev); |
451 | if (isdigit(dname[strlen(dname) - 1])) | |
3ada8b7e | 452 | dev_set_name(pdev, "%sp%d", dname, partno); |
1da177e4 | 453 | else |
3ada8b7e | 454 | dev_set_name(pdev, "%s%d", dname, partno); |
edfaa7c3 | 455 | |
ed9e1982 TH |
456 | device_initialize(pdev); |
457 | pdev->class = &block_class; | |
458 | pdev->type = &part_type; | |
459 | pdev->parent = ddev; | |
edfaa7c3 | 460 | |
bcce3de1 TH |
461 | err = blk_alloc_devt(p, &devt); |
462 | if (err) | |
eb60fa10 | 463 | goto out_free_stats; |
ed9e1982 | 464 | pdev->devt = devt; |
bcce3de1 | 465 | |
edfaa7c3 | 466 | /* delay uevent until 'holders' subdir is created */ |
f67f129e | 467 | dev_set_uevent_suppress(pdev, 1); |
ed9e1982 | 468 | err = device_add(pdev); |
d805dda4 | 469 | if (err) |
88e34126 TH |
470 | goto out_put; |
471 | ||
472 | err = -ENOMEM; | |
ed9e1982 | 473 | p->holder_dir = kobject_create_and_add("holders", &pdev->kobj); |
88e34126 TH |
474 | if (!p->holder_dir) |
475 | goto out_del; | |
476 | ||
f67f129e | 477 | dev_set_uevent_suppress(pdev, 0); |
d805dda4 | 478 | if (flags & ADDPART_FLAG_WHOLEDISK) { |
ed9e1982 | 479 | err = device_create_file(pdev, &dev_attr_whole_disk); |
d805dda4 | 480 | if (err) |
88e34126 | 481 | goto out_del; |
d805dda4 | 482 | } |
1da177e4 | 483 | |
88e34126 | 484 | /* everything is up and running, commence */ |
540eed56 | 485 | rcu_assign_pointer(ptbl->part[partno], p); |
88e34126 | 486 | |
edfaa7c3 | 487 | /* suppress uevent if the disk supresses it */ |
f8c73c79 | 488 | if (!dev_get_uevent_suppress(ddev)) |
ed9e1982 | 489 | kobject_uevent(&pdev->kobj, KOBJ_ADD); |
d805dda4 | 490 | |
ba32929a | 491 | return p; |
d805dda4 | 492 | |
eb60fa10 TH |
493 | out_free_stats: |
494 | free_part_stats(p); | |
88e34126 TH |
495 | out_free: |
496 | kfree(p); | |
ba32929a | 497 | return ERR_PTR(err); |
88e34126 TH |
498 | out_del: |
499 | kobject_put(p->holder_dir); | |
ed9e1982 | 500 | device_del(pdev); |
88e34126 | 501 | out_put: |
ed9e1982 | 502 | put_device(pdev); |
bcce3de1 | 503 | blk_free_devt(devt); |
ba32929a | 504 | return ERR_PTR(err); |
1da177e4 LT |
505 | } |
506 | ||
507 | /* Not exported, helper to add_disk(). */ | |
508 | void register_disk(struct gendisk *disk) | |
509 | { | |
ed9e1982 | 510 | struct device *ddev = disk_to_dev(disk); |
1da177e4 | 511 | struct block_device *bdev; |
e71bf0d0 TH |
512 | struct disk_part_iter piter; |
513 | struct hd_struct *part; | |
1da177e4 LT |
514 | int err; |
515 | ||
ed9e1982 | 516 | ddev->parent = disk->driverfs_dev; |
edfaa7c3 | 517 | |
3ada8b7e | 518 | dev_set_name(ddev, disk->disk_name); |
edfaa7c3 KS |
519 | |
520 | /* delay uevents, until we scanned partition table */ | |
f67f129e | 521 | dev_set_uevent_suppress(ddev, 1); |
edfaa7c3 | 522 | |
ed9e1982 | 523 | if (device_add(ddev)) |
1da177e4 | 524 | return; |
edfaa7c3 | 525 | #ifndef CONFIG_SYSFS_DEPRECATED |
ed9e1982 TH |
526 | err = sysfs_create_link(block_depr, &ddev->kobj, |
527 | kobject_name(&ddev->kobj)); | |
eee44cca | 528 | if (err) { |
ed9e1982 | 529 | device_del(ddev); |
eee44cca JG |
530 | return; |
531 | } | |
edfaa7c3 | 532 | #endif |
4c46501d TH |
533 | disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj); |
534 | disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj); | |
1da177e4 LT |
535 | |
536 | /* No minors to use for partitions */ | |
b5d0b9df | 537 | if (!disk_partitionable(disk)) |
d4d7e5df | 538 | goto exit; |
1da177e4 LT |
539 | |
540 | /* No such device (e.g., media were just removed) */ | |
541 | if (!get_capacity(disk)) | |
d4d7e5df | 542 | goto exit; |
1da177e4 LT |
543 | |
544 | bdev = bdget_disk(disk, 0); | |
545 | if (!bdev) | |
d4d7e5df | 546 | goto exit; |
1da177e4 LT |
547 | |
548 | bdev->bd_invalidated = 1; | |
572c4892 | 549 | err = blkdev_get(bdev, FMODE_READ); |
d4d7e5df KS |
550 | if (err < 0) |
551 | goto exit; | |
9a1c3542 | 552 | blkdev_put(bdev, FMODE_READ); |
d4d7e5df KS |
553 | |
554 | exit: | |
edfaa7c3 | 555 | /* announce disk after possible partitions are created */ |
f67f129e | 556 | dev_set_uevent_suppress(ddev, 0); |
ed9e1982 | 557 | kobject_uevent(&ddev->kobj, KOBJ_ADD); |
d4d7e5df KS |
558 | |
559 | /* announce possible partitions */ | |
e71bf0d0 TH |
560 | disk_part_iter_init(&piter, disk, 0); |
561 | while ((part = disk_part_iter_next(&piter))) | |
ed9e1982 | 562 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD); |
e71bf0d0 | 563 | disk_part_iter_exit(&piter); |
1da177e4 LT |
564 | } |
565 | ||
b403a98e TH |
566 | static bool disk_unlock_native_capacity(struct gendisk *disk) |
567 | { | |
568 | const struct block_device_operations *bdops = disk->fops; | |
569 | ||
570 | if (bdops->unlock_native_capacity && | |
571 | !(disk->flags & GENHD_FL_NATIVE_CAPACITY)) { | |
572 | printk(KERN_CONT "enabling native capacity\n"); | |
573 | bdops->unlock_native_capacity(disk); | |
574 | disk->flags |= GENHD_FL_NATIVE_CAPACITY; | |
575 | return true; | |
576 | } else { | |
577 | printk(KERN_CONT "truncated\n"); | |
578 | return false; | |
579 | } | |
580 | } | |
581 | ||
1da177e4 LT |
582 | int rescan_partitions(struct gendisk *disk, struct block_device *bdev) |
583 | { | |
b403a98e | 584 | struct parsed_partitions *state = NULL; |
e71bf0d0 TH |
585 | struct disk_part_iter piter; |
586 | struct hd_struct *part; | |
540eed56 | 587 | int p, highest, res; |
56bca017 | 588 | rescan: |
b403a98e TH |
589 | if (state && !IS_ERR(state)) { |
590 | kfree(state); | |
591 | state = NULL; | |
592 | } | |
593 | ||
1da177e4 LT |
594 | if (bdev->bd_part_count) |
595 | return -EBUSY; | |
596 | res = invalidate_partition(disk, 0); | |
597 | if (res) | |
598 | return res; | |
e71bf0d0 TH |
599 | |
600 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); | |
601 | while ((part = disk_part_iter_next(&piter))) | |
602 | delete_partition(disk, part->partno); | |
603 | disk_part_iter_exit(&piter); | |
604 | ||
1da177e4 LT |
605 | if (disk->fops->revalidate_disk) |
606 | disk->fops->revalidate_disk(disk); | |
9bc3ffbf AP |
607 | check_disk_size_change(disk, bdev); |
608 | bdev->bd_invalidated = 0; | |
1da177e4 LT |
609 | if (!get_capacity(disk) || !(state = check_partition(disk, bdev))) |
610 | return 0; | |
b403a98e TH |
611 | if (IS_ERR(state)) { |
612 | /* | |
613 | * I/O error reading the partition table. If any | |
614 | * partition code tried to read beyond EOD, retry | |
615 | * after unlocking native capacity. | |
616 | */ | |
617 | if (PTR_ERR(state) == -ENOSPC) { | |
618 | printk(KERN_WARNING "%s: partition table beyond EOD, ", | |
619 | disk->disk_name); | |
620 | if (disk_unlock_native_capacity(disk)) | |
621 | goto rescan; | |
622 | } | |
b74a2f09 | 623 | return -EIO; |
b403a98e TH |
624 | } |
625 | /* | |
626 | * If any partition code tried to read beyond EOD, try | |
627 | * unlocking native capacity even if partition table is | |
628 | * sucessfully read as we could be missing some partitions. | |
629 | */ | |
630 | if (state->access_beyond_eod) { | |
631 | printk(KERN_WARNING | |
632 | "%s: partition table partially beyond EOD, ", | |
633 | disk->disk_name); | |
634 | if (disk_unlock_native_capacity(disk)) | |
635 | goto rescan; | |
636 | } | |
6bcf19d0 KS |
637 | |
638 | /* tell userspace that the media / partition table may have changed */ | |
ed9e1982 | 639 | kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); |
6bcf19d0 | 640 | |
540eed56 TH |
641 | /* Detect the highest partition number and preallocate |
642 | * disk->part_tbl. This is an optimization and not strictly | |
643 | * necessary. | |
644 | */ | |
645 | for (p = 1, highest = 0; p < state->limit; p++) | |
646 | if (state->parts[p].size) | |
647 | highest = p; | |
648 | ||
649 | disk_expand_part_tbl(disk, highest); | |
650 | ||
651 | /* add partitions */ | |
1da177e4 | 652 | for (p = 1; p < state->limit; p++) { |
db429e9e | 653 | sector_t size, from; |
56bca017 | 654 | |
db429e9e | 655 | size = state->parts[p].size; |
1da177e4 LT |
656 | if (!size) |
657 | continue; | |
db429e9e BZ |
658 | |
659 | from = state->parts[p].from; | |
ac0d86f5 KS |
660 | if (from >= get_capacity(disk)) { |
661 | printk(KERN_WARNING | |
b403a98e | 662 | "%s: p%d start %llu is beyond EOD, ", |
ac0d86f5 | 663 | disk->disk_name, p, (unsigned long long) from); |
b403a98e TH |
664 | if (disk_unlock_native_capacity(disk)) |
665 | goto rescan; | |
ac0d86f5 KS |
666 | continue; |
667 | } | |
db429e9e | 668 | |
98bd34ea | 669 | if (from + size > get_capacity(disk)) { |
8d99f83b | 670 | printk(KERN_WARNING |
b403a98e | 671 | "%s: p%d size %llu extends beyond EOD, ", |
ac0d86f5 | 672 | disk->disk_name, p, (unsigned long long) size); |
db429e9e | 673 | |
b403a98e | 674 | if (disk_unlock_native_capacity(disk)) { |
56bca017 | 675 | /* free state and restart */ |
56bca017 | 676 | goto rescan; |
db429e9e BZ |
677 | } else { |
678 | /* | |
679 | * we can not ignore partitions of broken tables | |
680 | * created by for example camera firmware, but | |
681 | * we limit them to the end of the disk to avoid | |
682 | * creating invalid block devices | |
683 | */ | |
db429e9e BZ |
684 | size = get_capacity(disk) - from; |
685 | } | |
04ebd4ae | 686 | } |
ba32929a TH |
687 | part = add_partition(disk, p, from, size, |
688 | state->parts[p].flags); | |
689 | if (IS_ERR(part)) { | |
690 | printk(KERN_ERR " %s: p%d could not be added: %ld\n", | |
691 | disk->disk_name, p, -PTR_ERR(part)); | |
04ebd4ae | 692 | continue; |
98bd34ea | 693 | } |
1da177e4 | 694 | #ifdef CONFIG_BLK_DEV_MD |
d18d7682 | 695 | if (state->parts[p].flags & ADDPART_FLAG_RAID) |
55e8e30c | 696 | md_autodetect_dev(part_to_dev(part)->devt); |
1da177e4 LT |
697 | #endif |
698 | } | |
699 | kfree(state); | |
700 | return 0; | |
701 | } | |
702 | ||
703 | unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p) | |
704 | { | |
705 | struct address_space *mapping = bdev->bd_inode->i_mapping; | |
706 | struct page *page; | |
707 | ||
090d2b18 PE |
708 | page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)), |
709 | NULL); | |
1da177e4 | 710 | if (!IS_ERR(page)) { |
1da177e4 LT |
711 | if (PageError(page)) |
712 | goto fail; | |
713 | p->v = page; | |
714 | return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9); | |
715 | fail: | |
716 | page_cache_release(page); | |
717 | } | |
718 | p->v = NULL; | |
719 | return NULL; | |
720 | } | |
721 | ||
722 | EXPORT_SYMBOL(read_dev_sector); | |
723 | ||
724 | void del_gendisk(struct gendisk *disk) | |
725 | { | |
e71bf0d0 TH |
726 | struct disk_part_iter piter; |
727 | struct hd_struct *part; | |
1da177e4 LT |
728 | |
729 | /* invalidate stuff */ | |
e71bf0d0 TH |
730 | disk_part_iter_init(&piter, disk, |
731 | DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE); | |
732 | while ((part = disk_part_iter_next(&piter))) { | |
733 | invalidate_partition(disk, part->partno); | |
734 | delete_partition(disk, part->partno); | |
1da177e4 | 735 | } |
e71bf0d0 TH |
736 | disk_part_iter_exit(&piter); |
737 | ||
1da177e4 | 738 | invalidate_partition(disk, 0); |
3e1a7ff8 | 739 | blk_free_devt(disk_to_dev(disk)->devt); |
80795aef | 740 | set_capacity(disk, 0); |
1da177e4 LT |
741 | disk->flags &= ~GENHD_FL_UP; |
742 | unlink_gendisk(disk); | |
074a7aca TH |
743 | part_stat_set_all(&disk->part0, 0); |
744 | disk->part0.stamp = 0; | |
1da177e4 | 745 | |
4c46501d | 746 | kobject_put(disk->part0.holder_dir); |
197b12d6 | 747 | kobject_put(disk->slave_dir); |
edfaa7c3 KS |
748 | disk->driverfs_dev = NULL; |
749 | #ifndef CONFIG_SYSFS_DEPRECATED | |
ed9e1982 | 750 | sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk))); |
edfaa7c3 | 751 | #endif |
ed9e1982 | 752 | device_del(disk_to_dev(disk)); |
1da177e4 | 753 | } |