Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/partitions/check.c | |
3 | * | |
4 | * Code extracted from drivers/block/genhd.c | |
5 | * Copyright (C) 1991-1998 Linus Torvalds | |
6 | * Re-organised Feb 1998 Russell King | |
7 | * | |
8 | * We now have independent partition support from the | |
9 | * block drivers, which allows all the partition code to | |
10 | * be grouped in one location, and it to be mostly self | |
11 | * contained. | |
12 | * | |
13 | * Added needed MAJORS for new pairs, {hdi,hdj}, {hdk,hdl} | |
14 | */ | |
15 | ||
16 | #include <linux/init.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/fs.h> | |
19 | #include <linux/kmod.h> | |
20 | #include <linux/ctype.h> | |
6f2576af | 21 | #include <linux/genhd.h> |
1da177e4 LT |
22 | |
23 | #include "check.h" | |
1da177e4 LT |
24 | |
25 | #include "acorn.h" | |
26 | #include "amiga.h" | |
27 | #include "atari.h" | |
28 | #include "ldm.h" | |
29 | #include "mac.h" | |
30 | #include "msdos.h" | |
31 | #include "osf.h" | |
32 | #include "sgi.h" | |
33 | #include "sun.h" | |
34 | #include "ibm.h" | |
35 | #include "ultrix.h" | |
36 | #include "efi.h" | |
0e6e1db4 | 37 | #include "karma.h" |
19d0e8ce | 38 | #include "sysv68.h" |
1da177e4 LT |
39 | |
40 | #ifdef CONFIG_BLK_DEV_MD | |
41 | extern void md_autodetect_dev(dev_t dev); | |
42 | #endif | |
43 | ||
44 | int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/ | |
45 | ||
46 | static int (*check_part[])(struct parsed_partitions *, struct block_device *) = { | |
47 | /* | |
48 | * Probe partition formats with tables at disk address 0 | |
49 | * that also have an ADFS boot block at 0xdc0. | |
50 | */ | |
51 | #ifdef CONFIG_ACORN_PARTITION_ICS | |
52 | adfspart_check_ICS, | |
53 | #endif | |
54 | #ifdef CONFIG_ACORN_PARTITION_POWERTEC | |
55 | adfspart_check_POWERTEC, | |
56 | #endif | |
57 | #ifdef CONFIG_ACORN_PARTITION_EESOX | |
58 | adfspart_check_EESOX, | |
59 | #endif | |
60 | ||
61 | /* | |
62 | * Now move on to formats that only have partition info at | |
63 | * disk address 0xdc0. Since these may also have stale | |
64 | * PC/BIOS partition tables, they need to come before | |
65 | * the msdos entry. | |
66 | */ | |
67 | #ifdef CONFIG_ACORN_PARTITION_CUMANA | |
68 | adfspart_check_CUMANA, | |
69 | #endif | |
70 | #ifdef CONFIG_ACORN_PARTITION_ADFS | |
71 | adfspart_check_ADFS, | |
72 | #endif | |
73 | ||
74 | #ifdef CONFIG_EFI_PARTITION | |
75 | efi_partition, /* this must come before msdos */ | |
76 | #endif | |
77 | #ifdef CONFIG_SGI_PARTITION | |
78 | sgi_partition, | |
79 | #endif | |
80 | #ifdef CONFIG_LDM_PARTITION | |
81 | ldm_partition, /* this must come before msdos */ | |
82 | #endif | |
1da177e4 LT |
83 | #ifdef CONFIG_MSDOS_PARTITION |
84 | msdos_partition, | |
85 | #endif | |
86 | #ifdef CONFIG_OSF_PARTITION | |
87 | osf_partition, | |
88 | #endif | |
89 | #ifdef CONFIG_SUN_PARTITION | |
90 | sun_partition, | |
91 | #endif | |
92 | #ifdef CONFIG_AMIGA_PARTITION | |
93 | amiga_partition, | |
94 | #endif | |
95 | #ifdef CONFIG_ATARI_PARTITION | |
96 | atari_partition, | |
97 | #endif | |
98 | #ifdef CONFIG_MAC_PARTITION | |
99 | mac_partition, | |
100 | #endif | |
101 | #ifdef CONFIG_ULTRIX_PARTITION | |
102 | ultrix_partition, | |
103 | #endif | |
104 | #ifdef CONFIG_IBM_PARTITION | |
105 | ibm_partition, | |
0e6e1db4 BC |
106 | #endif |
107 | #ifdef CONFIG_KARMA_PARTITION | |
108 | karma_partition, | |
19d0e8ce PDM |
109 | #endif |
110 | #ifdef CONFIG_SYSV68_PARTITION | |
111 | sysv68_partition, | |
1da177e4 LT |
112 | #endif |
113 | NULL | |
114 | }; | |
115 | ||
116 | /* | |
117 | * disk_name() is used by partition check code and the genhd driver. | |
118 | * It formats the devicename of the indicated disk into | |
119 | * the supplied buffer (of size at least 32), and returns | |
120 | * a pointer to that same buffer (for convenience). | |
121 | */ | |
122 | ||
123 | char *disk_name(struct gendisk *hd, int part, char *buf) | |
124 | { | |
125 | if (!part) | |
126 | snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name); | |
127 | else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) | |
128 | snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, part); | |
129 | else | |
130 | snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, part); | |
131 | ||
132 | return buf; | |
133 | } | |
134 | ||
135 | const char *bdevname(struct block_device *bdev, char *buf) | |
136 | { | |
137 | int part = MINOR(bdev->bd_dev) - bdev->bd_disk->first_minor; | |
138 | return disk_name(bdev->bd_disk, part, buf); | |
139 | } | |
140 | ||
141 | EXPORT_SYMBOL(bdevname); | |
142 | ||
143 | /* | |
144 | * There's very little reason to use this, you should really | |
145 | * have a struct block_device just about everywhere and use | |
146 | * bdevname() instead. | |
147 | */ | |
148 | const char *__bdevname(dev_t dev, char *buffer) | |
149 | { | |
150 | scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)", | |
151 | MAJOR(dev), MINOR(dev)); | |
152 | return buffer; | |
153 | } | |
154 | ||
155 | EXPORT_SYMBOL(__bdevname); | |
156 | ||
157 | static struct parsed_partitions * | |
158 | check_partition(struct gendisk *hd, struct block_device *bdev) | |
159 | { | |
160 | struct parsed_partitions *state; | |
57881dd9 | 161 | int i, res, err; |
1da177e4 LT |
162 | |
163 | state = kmalloc(sizeof(struct parsed_partitions), GFP_KERNEL); | |
164 | if (!state) | |
165 | return NULL; | |
166 | ||
a2964188 GKH |
167 | disk_name(hd, 0, state->name); |
168 | printk(KERN_INFO " %s:", state->name); | |
169 | if (isdigit(state->name[strlen(state->name)-1])) | |
1da177e4 | 170 | sprintf(state->name, "p"); |
a2964188 | 171 | |
1da177e4 | 172 | state->limit = hd->minors; |
57881dd9 | 173 | i = res = err = 0; |
1da177e4 LT |
174 | while (!res && check_part[i]) { |
175 | memset(&state->parts, 0, sizeof(state->parts)); | |
176 | res = check_part[i++](state, bdev); | |
57881dd9 S |
177 | if (res < 0) { |
178 | /* We have hit an I/O error which we don't report now. | |
179 | * But record it, and let the others do their job. | |
180 | */ | |
181 | err = res; | |
182 | res = 0; | |
183 | } | |
184 | ||
1da177e4 LT |
185 | } |
186 | if (res > 0) | |
187 | return state; | |
9bebff6c | 188 | if (err) |
57881dd9 S |
189 | /* The partition is unrecognized. So report I/O errors if there were any */ |
190 | res = err; | |
1da177e4 LT |
191 | if (!res) |
192 | printk(" unknown partition table\n"); | |
193 | else if (warn_no_part) | |
194 | printk(" unable to read partition table\n"); | |
195 | kfree(state); | |
5127d002 | 196 | return ERR_PTR(res); |
1da177e4 LT |
197 | } |
198 | ||
edfaa7c3 KS |
199 | static ssize_t part_start_show(struct device *dev, |
200 | struct device_attribute *attr, char *buf) | |
1da177e4 | 201 | { |
edfaa7c3 | 202 | struct hd_struct *p = dev_to_part(dev); |
a7fd6706 | 203 | |
edfaa7c3 | 204 | return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect); |
1da177e4 LT |
205 | } |
206 | ||
edfaa7c3 KS |
207 | static ssize_t part_size_show(struct device *dev, |
208 | struct device_attribute *attr, char *buf) | |
a7fd6706 | 209 | { |
edfaa7c3 KS |
210 | struct hd_struct *p = dev_to_part(dev); |
211 | return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects); | |
a7fd6706 | 212 | } |
edfaa7c3 KS |
213 | |
214 | static ssize_t part_stat_show(struct device *dev, | |
215 | struct device_attribute *attr, char *buf) | |
1da177e4 | 216 | { |
edfaa7c3 KS |
217 | struct hd_struct *p = dev_to_part(dev); |
218 | ||
219 | return sprintf(buf, "%8u %8llu %8u %8llu\n", | |
a362357b JA |
220 | p->ios[0], (unsigned long long)p->sectors[0], |
221 | p->ios[1], (unsigned long long)p->sectors[1]); | |
1da177e4 | 222 | } |
1da177e4 | 223 | |
c17bb495 | 224 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 KS |
225 | static ssize_t part_fail_show(struct device *dev, |
226 | struct device_attribute *attr, char *buf) | |
227 | { | |
228 | struct hd_struct *p = dev_to_part(dev); | |
c17bb495 | 229 | |
edfaa7c3 KS |
230 | return sprintf(buf, "%d\n", p->make_it_fail); |
231 | } | |
232 | ||
233 | static ssize_t part_fail_store(struct device *dev, | |
234 | struct device_attribute *attr, | |
c17bb495 AM |
235 | const char *buf, size_t count) |
236 | { | |
edfaa7c3 | 237 | struct hd_struct *p = dev_to_part(dev); |
c17bb495 AM |
238 | int i; |
239 | ||
240 | if (count > 0 && sscanf(buf, "%d", &i) > 0) | |
241 | p->make_it_fail = (i == 0) ? 0 : 1; | |
242 | ||
243 | return count; | |
244 | } | |
edfaa7c3 | 245 | #endif |
c17bb495 | 246 | |
edfaa7c3 KS |
247 | static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL); |
248 | static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL); | |
249 | static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL); | |
250 | #ifdef CONFIG_FAIL_MAKE_REQUEST | |
251 | static struct device_attribute dev_attr_fail = | |
252 | __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store); | |
c17bb495 AM |
253 | #endif |
254 | ||
edfaa7c3 KS |
255 | static struct attribute *part_attrs[] = { |
256 | &dev_attr_start.attr, | |
257 | &dev_attr_size.attr, | |
258 | &dev_attr_stat.attr, | |
c17bb495 | 259 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 | 260 | &dev_attr_fail.attr, |
c17bb495 | 261 | #endif |
edfaa7c3 | 262 | NULL |
1da177e4 LT |
263 | }; |
264 | ||
edfaa7c3 KS |
265 | static struct attribute_group part_attr_group = { |
266 | .attrs = part_attrs, | |
267 | }; | |
1da177e4 | 268 | |
edfaa7c3 KS |
269 | static struct attribute_group *part_attr_groups[] = { |
270 | &part_attr_group, | |
271 | NULL | |
272 | }; | |
273 | ||
274 | static void part_release(struct device *dev) | |
1da177e4 | 275 | { |
edfaa7c3 | 276 | struct hd_struct *p = dev_to_part(dev); |
6f2576af | 277 | free_part_stats(p); |
1da177e4 LT |
278 | kfree(p); |
279 | } | |
280 | ||
edfaa7c3 KS |
281 | struct device_type part_type = { |
282 | .name = "partition", | |
283 | .groups = part_attr_groups, | |
1da177e4 | 284 | .release = part_release, |
1da177e4 LT |
285 | }; |
286 | ||
6a4d44c1 JN |
287 | static inline void partition_sysfs_add_subdir(struct hd_struct *p) |
288 | { | |
289 | struct kobject *k; | |
290 | ||
edfaa7c3 | 291 | k = kobject_get(&p->dev.kobj); |
4ff6abff | 292 | p->holder_dir = kobject_create_and_add("holders", k); |
6a4d44c1 JN |
293 | kobject_put(k); |
294 | } | |
295 | ||
296 | static inline void disk_sysfs_add_subdirs(struct gendisk *disk) | |
297 | { | |
298 | struct kobject *k; | |
299 | ||
edfaa7c3 | 300 | k = kobject_get(&disk->dev.kobj); |
4ff6abff GKH |
301 | disk->holder_dir = kobject_create_and_add("holders", k); |
302 | disk->slave_dir = kobject_create_and_add("slaves", k); | |
6a4d44c1 JN |
303 | kobject_put(k); |
304 | } | |
6a4d44c1 | 305 | |
1da177e4 LT |
306 | void delete_partition(struct gendisk *disk, int part) |
307 | { | |
308 | struct hd_struct *p = disk->part[part-1]; | |
edfaa7c3 | 309 | |
1da177e4 LT |
310 | if (!p) |
311 | return; | |
312 | if (!p->nr_sects) | |
313 | return; | |
314 | disk->part[part-1] = NULL; | |
315 | p->start_sect = 0; | |
316 | p->nr_sects = 0; | |
a362357b JA |
317 | p->ios[0] = p->ios[1] = 0; |
318 | p->sectors[0] = p->sectors[1] = 0; | |
6f2576af | 319 | part_stat_set_all(p, 0); |
197b12d6 | 320 | kobject_put(p->holder_dir); |
edfaa7c3 KS |
321 | device_del(&p->dev); |
322 | put_device(&p->dev); | |
1da177e4 LT |
323 | } |
324 | ||
f4a00a2c GKH |
325 | static ssize_t whole_disk_show(struct device *dev, |
326 | struct device_attribute *attr, char *buf) | |
327 | { | |
328 | return 0; | |
329 | } | |
330 | static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH, | |
331 | whole_disk_show, NULL); | |
332 | ||
d18d7682 | 333 | void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len, int flags) |
1da177e4 LT |
334 | { |
335 | struct hd_struct *p; | |
edfaa7c3 | 336 | int err; |
1da177e4 | 337 | |
dd00cc48 | 338 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
1da177e4 LT |
339 | if (!p) |
340 | return; | |
edfaa7c3 | 341 | |
6f2576af JM |
342 | if (!init_part_stats(p)) { |
343 | kfree(p); | |
344 | return; | |
345 | } | |
1da177e4 LT |
346 | p->start_sect = start; |
347 | p->nr_sects = len; | |
348 | p->partno = part; | |
25e206b5 | 349 | p->policy = disk->policy; |
1da177e4 | 350 | |
edfaa7c3 KS |
351 | if (isdigit(disk->dev.bus_id[strlen(disk->dev.bus_id)-1])) |
352 | snprintf(p->dev.bus_id, BUS_ID_SIZE, | |
353 | "%sp%d", disk->dev.bus_id, part); | |
1da177e4 | 354 | else |
edfaa7c3 KS |
355 | snprintf(p->dev.bus_id, BUS_ID_SIZE, |
356 | "%s%d", disk->dev.bus_id, part); | |
357 | ||
358 | device_initialize(&p->dev); | |
359 | p->dev.devt = MKDEV(disk->major, disk->first_minor + part); | |
360 | p->dev.class = &block_class; | |
361 | p->dev.type = &part_type; | |
362 | p->dev.parent = &disk->dev; | |
363 | disk->part[part-1] = p; | |
364 | ||
365 | /* delay uevent until 'holders' subdir is created */ | |
366 | p->dev.uevent_suppress = 1; | |
367 | device_add(&p->dev); | |
368 | partition_sysfs_add_subdir(p); | |
369 | p->dev.uevent_suppress = 0; | |
f4a00a2c GKH |
370 | if (flags & ADDPART_FLAG_WHOLEDISK) |
371 | err = device_create_file(&p->dev, &dev_attr_whole_disk); | |
1da177e4 | 372 | |
edfaa7c3 KS |
373 | /* suppress uevent if the disk supresses it */ |
374 | if (!disk->dev.uevent_suppress) | |
375 | kobject_uevent(&p->dev.kobj, KOBJ_ADD); | |
1da177e4 LT |
376 | } |
377 | ||
378 | /* Not exported, helper to add_disk(). */ | |
379 | void register_disk(struct gendisk *disk) | |
380 | { | |
381 | struct block_device *bdev; | |
382 | char *s; | |
d4d7e5df KS |
383 | int i; |
384 | struct hd_struct *p; | |
1da177e4 LT |
385 | int err; |
386 | ||
edfaa7c3 KS |
387 | disk->dev.parent = disk->driverfs_dev; |
388 | disk->dev.devt = MKDEV(disk->major, disk->first_minor); | |
389 | ||
390 | strlcpy(disk->dev.bus_id, disk->disk_name, KOBJ_NAME_LEN); | |
391 | /* ewww... some of these buggers have / in the name... */ | |
392 | s = strchr(disk->dev.bus_id, '/'); | |
1da177e4 LT |
393 | if (s) |
394 | *s = '!'; | |
edfaa7c3 KS |
395 | |
396 | /* delay uevents, until we scanned partition table */ | |
397 | disk->dev.uevent_suppress = 1; | |
398 | ||
399 | if (device_add(&disk->dev)) | |
1da177e4 | 400 | return; |
edfaa7c3 KS |
401 | #ifndef CONFIG_SYSFS_DEPRECATED |
402 | err = sysfs_create_link(block_depr, &disk->dev.kobj, | |
403 | kobject_name(&disk->dev.kobj)); | |
eee44cca | 404 | if (err) { |
edfaa7c3 | 405 | device_del(&disk->dev); |
eee44cca JG |
406 | return; |
407 | } | |
edfaa7c3 KS |
408 | #endif |
409 | disk_sysfs_add_subdirs(disk); | |
1da177e4 LT |
410 | |
411 | /* No minors to use for partitions */ | |
a2964188 | 412 | if (disk->minors == 1) |
d4d7e5df | 413 | goto exit; |
1da177e4 LT |
414 | |
415 | /* No such device (e.g., media were just removed) */ | |
416 | if (!get_capacity(disk)) | |
d4d7e5df | 417 | goto exit; |
1da177e4 LT |
418 | |
419 | bdev = bdget_disk(disk, 0); | |
420 | if (!bdev) | |
d4d7e5df | 421 | goto exit; |
1da177e4 LT |
422 | |
423 | bdev->bd_invalidated = 1; | |
d4d7e5df | 424 | err = blkdev_get(bdev, FMODE_READ, 0); |
d4d7e5df KS |
425 | if (err < 0) |
426 | goto exit; | |
1da177e4 | 427 | blkdev_put(bdev); |
d4d7e5df KS |
428 | |
429 | exit: | |
edfaa7c3 KS |
430 | /* announce disk after possible partitions are created */ |
431 | disk->dev.uevent_suppress = 0; | |
432 | kobject_uevent(&disk->dev.kobj, KOBJ_ADD); | |
d4d7e5df KS |
433 | |
434 | /* announce possible partitions */ | |
435 | for (i = 1; i < disk->minors; i++) { | |
436 | p = disk->part[i-1]; | |
437 | if (!p || !p->nr_sects) | |
438 | continue; | |
edfaa7c3 | 439 | kobject_uevent(&p->dev.kobj, KOBJ_ADD); |
d4d7e5df | 440 | } |
1da177e4 LT |
441 | } |
442 | ||
443 | int rescan_partitions(struct gendisk *disk, struct block_device *bdev) | |
444 | { | |
445 | struct parsed_partitions *state; | |
446 | int p, res; | |
447 | ||
448 | if (bdev->bd_part_count) | |
449 | return -EBUSY; | |
450 | res = invalidate_partition(disk, 0); | |
451 | if (res) | |
452 | return res; | |
453 | bdev->bd_invalidated = 0; | |
454 | for (p = 1; p < disk->minors; p++) | |
455 | delete_partition(disk, p); | |
456 | if (disk->fops->revalidate_disk) | |
457 | disk->fops->revalidate_disk(disk); | |
458 | if (!get_capacity(disk) || !(state = check_partition(disk, bdev))) | |
459 | return 0; | |
5127d002 | 460 | if (IS_ERR(state)) /* I/O error reading the partition table */ |
b74a2f09 | 461 | return -EIO; |
1da177e4 LT |
462 | for (p = 1; p < state->limit; p++) { |
463 | sector_t size = state->parts[p].size; | |
464 | sector_t from = state->parts[p].from; | |
465 | if (!size) | |
466 | continue; | |
98bd34ea MM |
467 | if (from + size > get_capacity(disk)) { |
468 | printk(" %s: p%d exceeds device capacity\n", | |
469 | disk->disk_name, p); | |
470 | } | |
d18d7682 | 471 | add_partition(disk, p, from, size, state->parts[p].flags); |
1da177e4 | 472 | #ifdef CONFIG_BLK_DEV_MD |
d18d7682 | 473 | if (state->parts[p].flags & ADDPART_FLAG_RAID) |
1da177e4 LT |
474 | md_autodetect_dev(bdev->bd_dev+p); |
475 | #endif | |
476 | } | |
477 | kfree(state); | |
478 | return 0; | |
479 | } | |
480 | ||
481 | unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p) | |
482 | { | |
483 | struct address_space *mapping = bdev->bd_inode->i_mapping; | |
484 | struct page *page; | |
485 | ||
090d2b18 PE |
486 | page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)), |
487 | NULL); | |
1da177e4 | 488 | if (!IS_ERR(page)) { |
1da177e4 LT |
489 | if (PageError(page)) |
490 | goto fail; | |
491 | p->v = page; | |
492 | return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9); | |
493 | fail: | |
494 | page_cache_release(page); | |
495 | } | |
496 | p->v = NULL; | |
497 | return NULL; | |
498 | } | |
499 | ||
500 | EXPORT_SYMBOL(read_dev_sector); | |
501 | ||
502 | void del_gendisk(struct gendisk *disk) | |
503 | { | |
504 | int p; | |
505 | ||
506 | /* invalidate stuff */ | |
507 | for (p = disk->minors - 1; p > 0; p--) { | |
508 | invalidate_partition(disk, p); | |
509 | delete_partition(disk, p); | |
510 | } | |
511 | invalidate_partition(disk, 0); | |
512 | disk->capacity = 0; | |
513 | disk->flags &= ~GENHD_FL_UP; | |
514 | unlink_gendisk(disk); | |
515 | disk_stat_set_all(disk, 0); | |
20e5c81f | 516 | disk->stamp = 0; |
1da177e4 | 517 | |
197b12d6 GKH |
518 | kobject_put(disk->holder_dir); |
519 | kobject_put(disk->slave_dir); | |
edfaa7c3 KS |
520 | disk->driverfs_dev = NULL; |
521 | #ifndef CONFIG_SYSFS_DEPRECATED | |
522 | sysfs_remove_link(block_depr, disk->dev.bus_id); | |
523 | #endif | |
524 | device_del(&disk->dev); | |
1da177e4 | 525 | } |