]>
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 | |
c72758f3 MP |
240 | ssize_t part_alignment_offset_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, "%llu\n", (unsigned long long)p->alignment_offset); | |
245 | } | |
246 | ||
86b37281 MP |
247 | ssize_t part_discard_alignment_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, "%u\n", p->discard_alignment); | |
252 | } | |
253 | ||
074a7aca TH |
254 | ssize_t part_stat_show(struct device *dev, |
255 | struct device_attribute *attr, char *buf) | |
1da177e4 | 256 | { |
edfaa7c3 | 257 | struct hd_struct *p = dev_to_part(dev); |
c9959059 | 258 | int cpu; |
edfaa7c3 | 259 | |
074a7aca | 260 | cpu = part_stat_lock(); |
c9959059 | 261 | part_round_stats(cpu, p); |
074a7aca | 262 | part_stat_unlock(); |
34e8beac JM |
263 | return sprintf(buf, |
264 | "%8lu %8lu %8llu %8u " | |
265 | "%8lu %8lu %8llu %8u " | |
266 | "%8u %8u %8u" | |
267 | "\n", | |
268 | part_stat_read(p, ios[READ]), | |
269 | part_stat_read(p, merges[READ]), | |
270 | (unsigned long long)part_stat_read(p, sectors[READ]), | |
271 | jiffies_to_msecs(part_stat_read(p, ticks[READ])), | |
272 | part_stat_read(p, ios[WRITE]), | |
273 | part_stat_read(p, merges[WRITE]), | |
274 | (unsigned long long)part_stat_read(p, sectors[WRITE]), | |
275 | jiffies_to_msecs(part_stat_read(p, ticks[WRITE])), | |
316d315b | 276 | part_in_flight(p), |
34e8beac JM |
277 | jiffies_to_msecs(part_stat_read(p, io_ticks)), |
278 | jiffies_to_msecs(part_stat_read(p, time_in_queue))); | |
1da177e4 | 279 | } |
1da177e4 | 280 | |
316d315b NK |
281 | ssize_t part_inflight_show(struct device *dev, |
282 | struct device_attribute *attr, char *buf) | |
283 | { | |
284 | struct hd_struct *p = dev_to_part(dev); | |
285 | ||
286 | return sprintf(buf, "%8u %8u\n", p->in_flight[0], p->in_flight[1]); | |
287 | } | |
288 | ||
c17bb495 | 289 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
eddb2e26 TH |
290 | ssize_t part_fail_show(struct device *dev, |
291 | struct device_attribute *attr, char *buf) | |
edfaa7c3 KS |
292 | { |
293 | struct hd_struct *p = dev_to_part(dev); | |
c17bb495 | 294 | |
edfaa7c3 KS |
295 | return sprintf(buf, "%d\n", p->make_it_fail); |
296 | } | |
297 | ||
eddb2e26 TH |
298 | ssize_t part_fail_store(struct device *dev, |
299 | struct device_attribute *attr, | |
300 | const char *buf, size_t count) | |
c17bb495 | 301 | { |
edfaa7c3 | 302 | struct hd_struct *p = dev_to_part(dev); |
c17bb495 AM |
303 | int i; |
304 | ||
305 | if (count > 0 && sscanf(buf, "%d", &i) > 0) | |
306 | p->make_it_fail = (i == 0) ? 0 : 1; | |
307 | ||
308 | return count; | |
309 | } | |
edfaa7c3 | 310 | #endif |
c17bb495 | 311 | |
0fc71e3d | 312 | static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL); |
edfaa7c3 KS |
313 | static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL); |
314 | static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL); | |
c72758f3 | 315 | static DEVICE_ATTR(alignment_offset, S_IRUGO, part_alignment_offset_show, NULL); |
86b37281 MP |
316 | static DEVICE_ATTR(discard_alignment, S_IRUGO, part_discard_alignment_show, |
317 | NULL); | |
edfaa7c3 | 318 | static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL); |
316d315b | 319 | static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL); |
edfaa7c3 KS |
320 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
321 | static struct device_attribute dev_attr_fail = | |
322 | __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store); | |
c17bb495 AM |
323 | #endif |
324 | ||
edfaa7c3 | 325 | static struct attribute *part_attrs[] = { |
0fc71e3d | 326 | &dev_attr_partition.attr, |
edfaa7c3 KS |
327 | &dev_attr_start.attr, |
328 | &dev_attr_size.attr, | |
c72758f3 | 329 | &dev_attr_alignment_offset.attr, |
86b37281 | 330 | &dev_attr_discard_alignment.attr, |
edfaa7c3 | 331 | &dev_attr_stat.attr, |
316d315b | 332 | &dev_attr_inflight.attr, |
c17bb495 | 333 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 | 334 | &dev_attr_fail.attr, |
c17bb495 | 335 | #endif |
edfaa7c3 | 336 | NULL |
1da177e4 LT |
337 | }; |
338 | ||
edfaa7c3 KS |
339 | static struct attribute_group part_attr_group = { |
340 | .attrs = part_attrs, | |
341 | }; | |
1da177e4 | 342 | |
a4dbd674 | 343 | static const struct attribute_group *part_attr_groups[] = { |
edfaa7c3 | 344 | &part_attr_group, |
c71a8961 ACM |
345 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
346 | &blk_trace_attr_group, | |
347 | #endif | |
edfaa7c3 KS |
348 | NULL |
349 | }; | |
350 | ||
351 | static void part_release(struct device *dev) | |
1da177e4 | 352 | { |
edfaa7c3 | 353 | struct hd_struct *p = dev_to_part(dev); |
6f2576af | 354 | free_part_stats(p); |
6d1d8050 | 355 | free_part_info(p); |
1da177e4 LT |
356 | kfree(p); |
357 | } | |
358 | ||
edfaa7c3 KS |
359 | struct device_type part_type = { |
360 | .name = "partition", | |
361 | .groups = part_attr_groups, | |
1da177e4 | 362 | .release = part_release, |
1da177e4 LT |
363 | }; |
364 | ||
e71bf0d0 TH |
365 | static void delete_partition_rcu_cb(struct rcu_head *head) |
366 | { | |
367 | struct hd_struct *part = container_of(head, struct hd_struct, rcu_head); | |
7681bfee YI |
368 | struct gendisk *disk = part_to_disk(part); |
369 | struct request_queue *q = disk->queue; | |
370 | unsigned long flags; | |
e71bf0d0 TH |
371 | |
372 | part->start_sect = 0; | |
373 | part->nr_sects = 0; | |
374 | part_stat_set_all(part, 0); | |
ed9e1982 | 375 | put_device(part_to_dev(part)); |
7681bfee YI |
376 | |
377 | spin_lock_irqsave(q->queue_lock, flags); | |
378 | elv_quiesce_end(q); | |
379 | spin_unlock_irqrestore(q->queue_lock, flags); | |
e71bf0d0 TH |
380 | } |
381 | ||
cf771cb5 | 382 | void delete_partition(struct gendisk *disk, int partno) |
1da177e4 | 383 | { |
540eed56 | 384 | struct disk_part_tbl *ptbl = disk->part_tbl; |
e71bf0d0 | 385 | struct hd_struct *part; |
7681bfee | 386 | struct request_queue *q = disk->queue; |
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 | 400 | |
7681bfee YI |
401 | spin_lock_irq(q->queue_lock); |
402 | elv_quiesce_start(q); | |
403 | spin_unlock_irq(q->queue_lock); | |
404 | ||
e71bf0d0 | 405 | call_rcu(&part->rcu_head, delete_partition_rcu_cb); |
1da177e4 LT |
406 | } |
407 | ||
f4a00a2c GKH |
408 | static ssize_t whole_disk_show(struct device *dev, |
409 | struct device_attribute *attr, char *buf) | |
410 | { | |
411 | return 0; | |
412 | } | |
413 | static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH, | |
414 | whole_disk_show, NULL); | |
415 | ||
ba32929a | 416 | struct hd_struct *add_partition(struct gendisk *disk, int partno, |
6d1d8050 WD |
417 | sector_t start, sector_t len, int flags, |
418 | struct partition_meta_info *info) | |
1da177e4 LT |
419 | { |
420 | struct hd_struct *p; | |
bcce3de1 | 421 | dev_t devt = MKDEV(0, 0); |
ed9e1982 TH |
422 | struct device *ddev = disk_to_dev(disk); |
423 | struct device *pdev; | |
540eed56 | 424 | struct disk_part_tbl *ptbl; |
ed9e1982 | 425 | const char *dname; |
edfaa7c3 | 426 | int err; |
1da177e4 | 427 | |
540eed56 TH |
428 | err = disk_expand_part_tbl(disk, partno); |
429 | if (err) | |
ba32929a | 430 | return ERR_PTR(err); |
540eed56 TH |
431 | ptbl = disk->part_tbl; |
432 | ||
433 | if (ptbl->part[partno]) | |
ba32929a | 434 | return ERR_PTR(-EBUSY); |
88e34126 | 435 | |
dd00cc48 | 436 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
1da177e4 | 437 | if (!p) |
ba32929a | 438 | return ERR_PTR(-EBUSY); |
edfaa7c3 | 439 | |
6f2576af | 440 | if (!init_part_stats(p)) { |
d805dda4 | 441 | err = -ENOMEM; |
88e34126 | 442 | goto out_free; |
6f2576af | 443 | } |
ed9e1982 TH |
444 | pdev = part_to_dev(p); |
445 | ||
1da177e4 | 446 | p->start_sect = start; |
e03a72e1 MP |
447 | p->alignment_offset = |
448 | queue_limit_alignment_offset(&disk->queue->limits, start); | |
449 | p->discard_alignment = | |
450 | queue_limit_discard_alignment(&disk->queue->limits, start); | |
1da177e4 | 451 | p->nr_sects = len; |
cf771cb5 | 452 | p->partno = partno; |
b7db9956 | 453 | p->policy = get_disk_ro(disk); |
1da177e4 | 454 | |
6d1d8050 WD |
455 | if (info) { |
456 | struct partition_meta_info *pinfo = alloc_part_info(disk); | |
457 | if (!pinfo) | |
458 | goto out_free_stats; | |
459 | memcpy(pinfo, info, sizeof(*info)); | |
460 | p->info = pinfo; | |
461 | } | |
462 | ||
ed9e1982 TH |
463 | dname = dev_name(ddev); |
464 | if (isdigit(dname[strlen(dname) - 1])) | |
3ada8b7e | 465 | dev_set_name(pdev, "%sp%d", dname, partno); |
1da177e4 | 466 | else |
3ada8b7e | 467 | dev_set_name(pdev, "%s%d", dname, partno); |
edfaa7c3 | 468 | |
ed9e1982 TH |
469 | device_initialize(pdev); |
470 | pdev->class = &block_class; | |
471 | pdev->type = &part_type; | |
472 | pdev->parent = ddev; | |
edfaa7c3 | 473 | |
bcce3de1 TH |
474 | err = blk_alloc_devt(p, &devt); |
475 | if (err) | |
6d1d8050 | 476 | goto out_free_info; |
ed9e1982 | 477 | pdev->devt = devt; |
bcce3de1 | 478 | |
edfaa7c3 | 479 | /* delay uevent until 'holders' subdir is created */ |
f67f129e | 480 | dev_set_uevent_suppress(pdev, 1); |
ed9e1982 | 481 | err = device_add(pdev); |
d805dda4 | 482 | if (err) |
88e34126 TH |
483 | goto out_put; |
484 | ||
485 | err = -ENOMEM; | |
ed9e1982 | 486 | p->holder_dir = kobject_create_and_add("holders", &pdev->kobj); |
88e34126 TH |
487 | if (!p->holder_dir) |
488 | goto out_del; | |
489 | ||
f67f129e | 490 | dev_set_uevent_suppress(pdev, 0); |
d805dda4 | 491 | if (flags & ADDPART_FLAG_WHOLEDISK) { |
ed9e1982 | 492 | err = device_create_file(pdev, &dev_attr_whole_disk); |
d805dda4 | 493 | if (err) |
88e34126 | 494 | goto out_del; |
d805dda4 | 495 | } |
1da177e4 | 496 | |
88e34126 | 497 | /* everything is up and running, commence */ |
540eed56 | 498 | rcu_assign_pointer(ptbl->part[partno], p); |
88e34126 | 499 | |
edfaa7c3 | 500 | /* suppress uevent if the disk supresses it */ |
f8c73c79 | 501 | if (!dev_get_uevent_suppress(ddev)) |
ed9e1982 | 502 | kobject_uevent(&pdev->kobj, KOBJ_ADD); |
d805dda4 | 503 | |
ba32929a | 504 | return p; |
d805dda4 | 505 | |
6d1d8050 WD |
506 | out_free_info: |
507 | free_part_info(p); | |
eb60fa10 TH |
508 | out_free_stats: |
509 | free_part_stats(p); | |
88e34126 TH |
510 | out_free: |
511 | kfree(p); | |
ba32929a | 512 | return ERR_PTR(err); |
88e34126 TH |
513 | out_del: |
514 | kobject_put(p->holder_dir); | |
ed9e1982 | 515 | device_del(pdev); |
88e34126 | 516 | out_put: |
ed9e1982 | 517 | put_device(pdev); |
bcce3de1 | 518 | blk_free_devt(devt); |
ba32929a | 519 | return ERR_PTR(err); |
1da177e4 LT |
520 | } |
521 | ||
522 | /* Not exported, helper to add_disk(). */ | |
523 | void register_disk(struct gendisk *disk) | |
524 | { | |
ed9e1982 | 525 | struct device *ddev = disk_to_dev(disk); |
1da177e4 | 526 | struct block_device *bdev; |
e71bf0d0 TH |
527 | struct disk_part_iter piter; |
528 | struct hd_struct *part; | |
1da177e4 LT |
529 | int err; |
530 | ||
ed9e1982 | 531 | ddev->parent = disk->driverfs_dev; |
edfaa7c3 | 532 | |
3ada8b7e | 533 | dev_set_name(ddev, disk->disk_name); |
edfaa7c3 KS |
534 | |
535 | /* delay uevents, until we scanned partition table */ | |
f67f129e | 536 | dev_set_uevent_suppress(ddev, 1); |
edfaa7c3 | 537 | |
ed9e1982 | 538 | if (device_add(ddev)) |
1da177e4 | 539 | return; |
e52eec13 AK |
540 | if (!sysfs_deprecated) { |
541 | err = sysfs_create_link(block_depr, &ddev->kobj, | |
542 | kobject_name(&ddev->kobj)); | |
543 | if (err) { | |
544 | device_del(ddev); | |
545 | return; | |
546 | } | |
eee44cca | 547 | } |
4c46501d TH |
548 | disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj); |
549 | disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj); | |
1da177e4 LT |
550 | |
551 | /* No minors to use for partitions */ | |
b5d0b9df | 552 | if (!disk_partitionable(disk)) |
d4d7e5df | 553 | goto exit; |
1da177e4 LT |
554 | |
555 | /* No such device (e.g., media were just removed) */ | |
556 | if (!get_capacity(disk)) | |
d4d7e5df | 557 | goto exit; |
1da177e4 LT |
558 | |
559 | bdev = bdget_disk(disk, 0); | |
560 | if (!bdev) | |
d4d7e5df | 561 | goto exit; |
1da177e4 LT |
562 | |
563 | bdev->bd_invalidated = 1; | |
572c4892 | 564 | err = blkdev_get(bdev, FMODE_READ); |
d4d7e5df KS |
565 | if (err < 0) |
566 | goto exit; | |
9a1c3542 | 567 | blkdev_put(bdev, FMODE_READ); |
d4d7e5df KS |
568 | |
569 | exit: | |
edfaa7c3 | 570 | /* announce disk after possible partitions are created */ |
f67f129e | 571 | dev_set_uevent_suppress(ddev, 0); |
ed9e1982 | 572 | kobject_uevent(&ddev->kobj, KOBJ_ADD); |
d4d7e5df KS |
573 | |
574 | /* announce possible partitions */ | |
e71bf0d0 TH |
575 | disk_part_iter_init(&piter, disk, 0); |
576 | while ((part = disk_part_iter_next(&piter))) | |
ed9e1982 | 577 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD); |
e71bf0d0 | 578 | disk_part_iter_exit(&piter); |
1da177e4 LT |
579 | } |
580 | ||
b403a98e TH |
581 | static bool disk_unlock_native_capacity(struct gendisk *disk) |
582 | { | |
583 | const struct block_device_operations *bdops = disk->fops; | |
584 | ||
585 | if (bdops->unlock_native_capacity && | |
586 | !(disk->flags & GENHD_FL_NATIVE_CAPACITY)) { | |
587 | printk(KERN_CONT "enabling native capacity\n"); | |
588 | bdops->unlock_native_capacity(disk); | |
589 | disk->flags |= GENHD_FL_NATIVE_CAPACITY; | |
590 | return true; | |
591 | } else { | |
592 | printk(KERN_CONT "truncated\n"); | |
593 | return false; | |
594 | } | |
595 | } | |
596 | ||
1da177e4 LT |
597 | int rescan_partitions(struct gendisk *disk, struct block_device *bdev) |
598 | { | |
b403a98e | 599 | struct parsed_partitions *state = NULL; |
e71bf0d0 TH |
600 | struct disk_part_iter piter; |
601 | struct hd_struct *part; | |
540eed56 | 602 | int p, highest, res; |
56bca017 | 603 | rescan: |
b403a98e TH |
604 | if (state && !IS_ERR(state)) { |
605 | kfree(state); | |
606 | state = NULL; | |
607 | } | |
608 | ||
1da177e4 LT |
609 | if (bdev->bd_part_count) |
610 | return -EBUSY; | |
611 | res = invalidate_partition(disk, 0); | |
612 | if (res) | |
613 | return res; | |
e71bf0d0 TH |
614 | |
615 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); | |
616 | while ((part = disk_part_iter_next(&piter))) | |
617 | delete_partition(disk, part->partno); | |
618 | disk_part_iter_exit(&piter); | |
619 | ||
1da177e4 LT |
620 | if (disk->fops->revalidate_disk) |
621 | disk->fops->revalidate_disk(disk); | |
9bc3ffbf AP |
622 | check_disk_size_change(disk, bdev); |
623 | bdev->bd_invalidated = 0; | |
1da177e4 LT |
624 | if (!get_capacity(disk) || !(state = check_partition(disk, bdev))) |
625 | return 0; | |
b403a98e TH |
626 | if (IS_ERR(state)) { |
627 | /* | |
628 | * I/O error reading the partition table. If any | |
629 | * partition code tried to read beyond EOD, retry | |
630 | * after unlocking native capacity. | |
631 | */ | |
632 | if (PTR_ERR(state) == -ENOSPC) { | |
633 | printk(KERN_WARNING "%s: partition table beyond EOD, ", | |
634 | disk->disk_name); | |
635 | if (disk_unlock_native_capacity(disk)) | |
636 | goto rescan; | |
637 | } | |
b74a2f09 | 638 | return -EIO; |
b403a98e TH |
639 | } |
640 | /* | |
641 | * If any partition code tried to read beyond EOD, try | |
642 | * unlocking native capacity even if partition table is | |
643 | * sucessfully read as we could be missing some partitions. | |
644 | */ | |
645 | if (state->access_beyond_eod) { | |
646 | printk(KERN_WARNING | |
647 | "%s: partition table partially beyond EOD, ", | |
648 | disk->disk_name); | |
649 | if (disk_unlock_native_capacity(disk)) | |
650 | goto rescan; | |
651 | } | |
6bcf19d0 KS |
652 | |
653 | /* tell userspace that the media / partition table may have changed */ | |
ed9e1982 | 654 | kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); |
6bcf19d0 | 655 | |
540eed56 TH |
656 | /* Detect the highest partition number and preallocate |
657 | * disk->part_tbl. This is an optimization and not strictly | |
658 | * necessary. | |
659 | */ | |
660 | for (p = 1, highest = 0; p < state->limit; p++) | |
661 | if (state->parts[p].size) | |
662 | highest = p; | |
663 | ||
664 | disk_expand_part_tbl(disk, highest); | |
665 | ||
666 | /* add partitions */ | |
1da177e4 | 667 | for (p = 1; p < state->limit; p++) { |
db429e9e | 668 | sector_t size, from; |
6d1d8050 | 669 | struct partition_meta_info *info = NULL; |
56bca017 | 670 | |
db429e9e | 671 | size = state->parts[p].size; |
1da177e4 LT |
672 | if (!size) |
673 | continue; | |
db429e9e BZ |
674 | |
675 | from = state->parts[p].from; | |
ac0d86f5 KS |
676 | if (from >= get_capacity(disk)) { |
677 | printk(KERN_WARNING | |
b403a98e | 678 | "%s: p%d start %llu is beyond EOD, ", |
ac0d86f5 | 679 | disk->disk_name, p, (unsigned long long) from); |
b403a98e TH |
680 | if (disk_unlock_native_capacity(disk)) |
681 | goto rescan; | |
ac0d86f5 KS |
682 | continue; |
683 | } | |
db429e9e | 684 | |
98bd34ea | 685 | if (from + size > get_capacity(disk)) { |
8d99f83b | 686 | printk(KERN_WARNING |
b403a98e | 687 | "%s: p%d size %llu extends beyond EOD, ", |
ac0d86f5 | 688 | disk->disk_name, p, (unsigned long long) size); |
db429e9e | 689 | |
b403a98e | 690 | if (disk_unlock_native_capacity(disk)) { |
56bca017 | 691 | /* free state and restart */ |
56bca017 | 692 | goto rescan; |
db429e9e BZ |
693 | } else { |
694 | /* | |
695 | * we can not ignore partitions of broken tables | |
696 | * created by for example camera firmware, but | |
697 | * we limit them to the end of the disk to avoid | |
698 | * creating invalid block devices | |
699 | */ | |
db429e9e BZ |
700 | size = get_capacity(disk) - from; |
701 | } | |
04ebd4ae | 702 | } |
6d1d8050 WD |
703 | |
704 | if (state->parts[p].has_info) | |
705 | info = &state->parts[p].info; | |
ba32929a | 706 | part = add_partition(disk, p, from, size, |
6d1d8050 WD |
707 | state->parts[p].flags, |
708 | &state->parts[p].info); | |
ba32929a TH |
709 | if (IS_ERR(part)) { |
710 | printk(KERN_ERR " %s: p%d could not be added: %ld\n", | |
711 | disk->disk_name, p, -PTR_ERR(part)); | |
04ebd4ae | 712 | continue; |
98bd34ea | 713 | } |
1da177e4 | 714 | #ifdef CONFIG_BLK_DEV_MD |
d18d7682 | 715 | if (state->parts[p].flags & ADDPART_FLAG_RAID) |
55e8e30c | 716 | md_autodetect_dev(part_to_dev(part)->devt); |
1da177e4 LT |
717 | #endif |
718 | } | |
719 | kfree(state); | |
720 | return 0; | |
721 | } | |
722 | ||
723 | unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p) | |
724 | { | |
725 | struct address_space *mapping = bdev->bd_inode->i_mapping; | |
726 | struct page *page; | |
727 | ||
090d2b18 PE |
728 | page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)), |
729 | NULL); | |
1da177e4 | 730 | if (!IS_ERR(page)) { |
1da177e4 LT |
731 | if (PageError(page)) |
732 | goto fail; | |
733 | p->v = page; | |
734 | return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9); | |
735 | fail: | |
736 | page_cache_release(page); | |
737 | } | |
738 | p->v = NULL; | |
739 | return NULL; | |
740 | } | |
741 | ||
742 | EXPORT_SYMBOL(read_dev_sector); | |
743 | ||
744 | void del_gendisk(struct gendisk *disk) | |
745 | { | |
e71bf0d0 TH |
746 | struct disk_part_iter piter; |
747 | struct hd_struct *part; | |
1da177e4 LT |
748 | |
749 | /* invalidate stuff */ | |
e71bf0d0 TH |
750 | disk_part_iter_init(&piter, disk, |
751 | DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE); | |
752 | while ((part = disk_part_iter_next(&piter))) { | |
753 | invalidate_partition(disk, part->partno); | |
754 | delete_partition(disk, part->partno); | |
1da177e4 | 755 | } |
e71bf0d0 TH |
756 | disk_part_iter_exit(&piter); |
757 | ||
1da177e4 | 758 | invalidate_partition(disk, 0); |
3e1a7ff8 | 759 | blk_free_devt(disk_to_dev(disk)->devt); |
80795aef | 760 | set_capacity(disk, 0); |
1da177e4 LT |
761 | disk->flags &= ~GENHD_FL_UP; |
762 | unlink_gendisk(disk); | |
074a7aca TH |
763 | part_stat_set_all(&disk->part0, 0); |
764 | disk->part0.stamp = 0; | |
1da177e4 | 765 | |
4c46501d | 766 | kobject_put(disk->part0.holder_dir); |
197b12d6 | 767 | kobject_put(disk->slave_dir); |
edfaa7c3 | 768 | disk->driverfs_dev = NULL; |
e52eec13 AK |
769 | if (!sysfs_deprecated) |
770 | sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk))); | |
ed9e1982 | 771 | device_del(disk_to_dev(disk)); |
1da177e4 | 772 | } |