Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * gendisk handling | |
3 | */ | |
4 | ||
1da177e4 LT |
5 | #include <linux/module.h> |
6 | #include <linux/fs.h> | |
7 | #include <linux/genhd.h> | |
b446b60e | 8 | #include <linux/kdev_t.h> |
1da177e4 LT |
9 | #include <linux/kernel.h> |
10 | #include <linux/blkdev.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/seq_file.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/kmod.h> | |
16 | #include <linux/kobj_map.h> | |
2ef41634 | 17 | #include <linux/buffer_head.h> |
58383af6 | 18 | #include <linux/mutex.h> |
1da177e4 | 19 | |
ff88972c AB |
20 | #include "blk.h" |
21 | ||
edfaa7c3 KS |
22 | static DEFINE_MUTEX(block_class_lock); |
23 | #ifndef CONFIG_SYSFS_DEPRECATED | |
24 | struct kobject *block_depr; | |
25 | #endif | |
1da177e4 | 26 | |
1826eadf AB |
27 | static struct device_type disk_type; |
28 | ||
1da177e4 LT |
29 | /* |
30 | * Can be deleted altogether. Later. | |
31 | * | |
32 | */ | |
33 | static struct blk_major_name { | |
34 | struct blk_major_name *next; | |
35 | int major; | |
36 | char name[16]; | |
68eef3b4 | 37 | } *major_names[BLKDEV_MAJOR_HASH_SIZE]; |
1da177e4 LT |
38 | |
39 | /* index in the above - for now: assume no multimajor ranges */ | |
40 | static inline int major_to_index(int major) | |
41 | { | |
68eef3b4 | 42 | return major % BLKDEV_MAJOR_HASH_SIZE; |
7170be5f NH |
43 | } |
44 | ||
68eef3b4 | 45 | #ifdef CONFIG_PROC_FS |
cf771cb5 | 46 | void blkdev_show(struct seq_file *seqf, off_t offset) |
7170be5f | 47 | { |
68eef3b4 | 48 | struct blk_major_name *dp; |
7170be5f | 49 | |
68eef3b4 | 50 | if (offset < BLKDEV_MAJOR_HASH_SIZE) { |
edfaa7c3 | 51 | mutex_lock(&block_class_lock); |
68eef3b4 | 52 | for (dp = major_names[offset]; dp; dp = dp->next) |
cf771cb5 | 53 | seq_printf(seqf, "%3d %s\n", dp->major, dp->name); |
edfaa7c3 | 54 | mutex_unlock(&block_class_lock); |
1da177e4 | 55 | } |
1da177e4 | 56 | } |
68eef3b4 | 57 | #endif /* CONFIG_PROC_FS */ |
1da177e4 LT |
58 | |
59 | int register_blkdev(unsigned int major, const char *name) | |
60 | { | |
61 | struct blk_major_name **n, *p; | |
62 | int index, ret = 0; | |
63 | ||
edfaa7c3 | 64 | mutex_lock(&block_class_lock); |
1da177e4 LT |
65 | |
66 | /* temporary */ | |
67 | if (major == 0) { | |
68 | for (index = ARRAY_SIZE(major_names)-1; index > 0; index--) { | |
69 | if (major_names[index] == NULL) | |
70 | break; | |
71 | } | |
72 | ||
73 | if (index == 0) { | |
74 | printk("register_blkdev: failed to get major for %s\n", | |
75 | name); | |
76 | ret = -EBUSY; | |
77 | goto out; | |
78 | } | |
79 | major = index; | |
80 | ret = major; | |
81 | } | |
82 | ||
83 | p = kmalloc(sizeof(struct blk_major_name), GFP_KERNEL); | |
84 | if (p == NULL) { | |
85 | ret = -ENOMEM; | |
86 | goto out; | |
87 | } | |
88 | ||
89 | p->major = major; | |
90 | strlcpy(p->name, name, sizeof(p->name)); | |
91 | p->next = NULL; | |
92 | index = major_to_index(major); | |
93 | ||
94 | for (n = &major_names[index]; *n; n = &(*n)->next) { | |
95 | if ((*n)->major == major) | |
96 | break; | |
97 | } | |
98 | if (!*n) | |
99 | *n = p; | |
100 | else | |
101 | ret = -EBUSY; | |
102 | ||
103 | if (ret < 0) { | |
104 | printk("register_blkdev: cannot get major %d for %s\n", | |
105 | major, name); | |
106 | kfree(p); | |
107 | } | |
108 | out: | |
edfaa7c3 | 109 | mutex_unlock(&block_class_lock); |
1da177e4 LT |
110 | return ret; |
111 | } | |
112 | ||
113 | EXPORT_SYMBOL(register_blkdev); | |
114 | ||
f4480240 | 115 | void unregister_blkdev(unsigned int major, const char *name) |
1da177e4 LT |
116 | { |
117 | struct blk_major_name **n; | |
118 | struct blk_major_name *p = NULL; | |
119 | int index = major_to_index(major); | |
1da177e4 | 120 | |
edfaa7c3 | 121 | mutex_lock(&block_class_lock); |
1da177e4 LT |
122 | for (n = &major_names[index]; *n; n = &(*n)->next) |
123 | if ((*n)->major == major) | |
124 | break; | |
294462a5 AM |
125 | if (!*n || strcmp((*n)->name, name)) { |
126 | WARN_ON(1); | |
294462a5 | 127 | } else { |
1da177e4 LT |
128 | p = *n; |
129 | *n = p->next; | |
130 | } | |
edfaa7c3 | 131 | mutex_unlock(&block_class_lock); |
1da177e4 | 132 | kfree(p); |
1da177e4 LT |
133 | } |
134 | ||
135 | EXPORT_SYMBOL(unregister_blkdev); | |
136 | ||
137 | static struct kobj_map *bdev_map; | |
138 | ||
139 | /* | |
140 | * Register device numbers dev..(dev+range-1) | |
141 | * range must be nonzero | |
142 | * The hash chain is sorted on range, so that subranges can override. | |
143 | */ | |
edfaa7c3 | 144 | void blk_register_region(dev_t devt, unsigned long range, struct module *module, |
1da177e4 LT |
145 | struct kobject *(*probe)(dev_t, int *, void *), |
146 | int (*lock)(dev_t, void *), void *data) | |
147 | { | |
edfaa7c3 | 148 | kobj_map(bdev_map, devt, range, module, probe, lock, data); |
1da177e4 LT |
149 | } |
150 | ||
151 | EXPORT_SYMBOL(blk_register_region); | |
152 | ||
edfaa7c3 | 153 | void blk_unregister_region(dev_t devt, unsigned long range) |
1da177e4 | 154 | { |
edfaa7c3 | 155 | kobj_unmap(bdev_map, devt, range); |
1da177e4 LT |
156 | } |
157 | ||
158 | EXPORT_SYMBOL(blk_unregister_region); | |
159 | ||
cf771cb5 | 160 | static struct kobject *exact_match(dev_t devt, int *partno, void *data) |
1da177e4 LT |
161 | { |
162 | struct gendisk *p = data; | |
edfaa7c3 KS |
163 | |
164 | return &p->dev.kobj; | |
1da177e4 LT |
165 | } |
166 | ||
edfaa7c3 | 167 | static int exact_lock(dev_t devt, void *data) |
1da177e4 LT |
168 | { |
169 | struct gendisk *p = data; | |
170 | ||
171 | if (!get_disk(p)) | |
172 | return -1; | |
173 | return 0; | |
174 | } | |
175 | ||
176 | /** | |
177 | * add_disk - add partitioning information to kernel list | |
178 | * @disk: per-device partitioning information | |
179 | * | |
180 | * This function registers the partitioning information in @disk | |
181 | * with the kernel. | |
182 | */ | |
183 | void add_disk(struct gendisk *disk) | |
184 | { | |
cf0ca9fe | 185 | struct backing_dev_info *bdi; |
6ffeea77 | 186 | int retval; |
cf0ca9fe | 187 | |
1da177e4 LT |
188 | disk->flags |= GENHD_FL_UP; |
189 | blk_register_region(MKDEV(disk->major, disk->first_minor), | |
190 | disk->minors, NULL, exact_match, exact_lock, disk); | |
191 | register_disk(disk); | |
192 | blk_register_queue(disk); | |
cf0ca9fe PZ |
193 | |
194 | bdi = &disk->queue->backing_dev_info; | |
195 | bdi_register_dev(bdi, MKDEV(disk->major, disk->first_minor)); | |
6ffeea77 GKH |
196 | retval = sysfs_create_link(&disk->dev.kobj, &bdi->dev->kobj, "bdi"); |
197 | WARN_ON(retval); | |
1da177e4 LT |
198 | } |
199 | ||
200 | EXPORT_SYMBOL(add_disk); | |
201 | EXPORT_SYMBOL(del_gendisk); /* in partitions/check.c */ | |
202 | ||
203 | void unlink_gendisk(struct gendisk *disk) | |
204 | { | |
cf0ca9fe PZ |
205 | sysfs_remove_link(&disk->dev.kobj, "bdi"); |
206 | bdi_unregister(&disk->queue->backing_dev_info); | |
1da177e4 LT |
207 | blk_unregister_queue(disk); |
208 | blk_unregister_region(MKDEV(disk->major, disk->first_minor), | |
209 | disk->minors); | |
210 | } | |
211 | ||
1da177e4 LT |
212 | /** |
213 | * get_gendisk - get partitioning information for a given device | |
710027a4 RD |
214 | * @devt: device to get partitioning information for |
215 | * @part: returned partition index | |
1da177e4 LT |
216 | * |
217 | * This function gets the structure containing partitioning | |
710027a4 | 218 | * information for the given device @devt. |
1da177e4 | 219 | */ |
cf771cb5 | 220 | struct gendisk *get_gendisk(dev_t devt, int *partno) |
1da177e4 | 221 | { |
cf771cb5 | 222 | struct kobject *kobj = kobj_lookup(bdev_map, devt, partno); |
edfaa7c3 KS |
223 | struct device *dev = kobj_to_dev(kobj); |
224 | ||
225 | return kobj ? dev_to_disk(dev) : NULL; | |
1da177e4 LT |
226 | } |
227 | ||
5c6f35c5 GKH |
228 | /* |
229 | * print a full list of all partitions - intended for places where the root | |
230 | * filesystem can't be mounted and thus to give the victim some idea of what | |
231 | * went wrong | |
232 | */ | |
233 | void __init printk_all_partitions(void) | |
234 | { | |
def4e38d TH |
235 | struct class_dev_iter iter; |
236 | struct device *dev; | |
237 | ||
238 | class_dev_iter_init(&iter, &block_class, NULL, &disk_type); | |
239 | while ((dev = class_dev_iter_next(&iter))) { | |
240 | struct gendisk *disk = dev_to_disk(dev); | |
241 | char buf[BDEVNAME_SIZE]; | |
242 | int n; | |
243 | ||
244 | /* | |
245 | * Don't show empty devices or things that have been | |
246 | * surpressed | |
247 | */ | |
248 | if (get_capacity(disk) == 0 || | |
249 | (disk->flags & GENHD_FL_SUPPRESS_PARTITION_INFO)) | |
250 | continue; | |
251 | ||
252 | /* | |
253 | * Note, unlike /proc/partitions, I am showing the | |
254 | * numbers in hex - the same format as the root= | |
255 | * option takes. | |
256 | */ | |
257 | printk("%02x%02x %10llu %s", | |
258 | disk->major, disk->first_minor, | |
259 | (unsigned long long)get_capacity(disk) >> 1, | |
260 | disk_name(disk, 0, buf)); | |
261 | if (disk->driverfs_dev != NULL && | |
262 | disk->driverfs_dev->driver != NULL) | |
263 | printk(" driver: %s\n", | |
264 | disk->driverfs_dev->driver->name); | |
265 | else | |
266 | printk(" (driver?)\n"); | |
267 | ||
268 | /* now show the partitions */ | |
269 | for (n = 0; n < disk->minors - 1; ++n) { | |
270 | if (disk->part[n] == NULL) | |
271 | continue; | |
272 | if (disk->part[n]->nr_sects == 0) | |
273 | continue; | |
274 | printk(" %02x%02x %10llu %s\n", | |
275 | disk->major, n + 1 + disk->first_minor, | |
276 | (unsigned long long)disk->part[n]->nr_sects >> 1, | |
277 | disk_name(disk, n + 1, buf)); | |
278 | } | |
279 | } | |
280 | class_dev_iter_exit(&iter); | |
dd2a345f DG |
281 | } |
282 | ||
1da177e4 LT |
283 | #ifdef CONFIG_PROC_FS |
284 | /* iterator */ | |
def4e38d | 285 | static void *disk_seqf_start(struct seq_file *seqf, loff_t *pos) |
68c4d4a7 | 286 | { |
def4e38d TH |
287 | loff_t skip = *pos; |
288 | struct class_dev_iter *iter; | |
289 | struct device *dev; | |
68c4d4a7 | 290 | |
def4e38d TH |
291 | iter = kmalloc(GFP_KERNEL, sizeof(*iter)); |
292 | if (!iter) | |
293 | return ERR_PTR(-ENOMEM); | |
294 | ||
295 | seqf->private = iter; | |
296 | class_dev_iter_init(iter, &block_class, NULL, &disk_type); | |
297 | do { | |
298 | dev = class_dev_iter_next(iter); | |
299 | if (!dev) | |
300 | return NULL; | |
301 | } while (skip--); | |
302 | ||
303 | return dev_to_disk(dev); | |
68c4d4a7 GKH |
304 | } |
305 | ||
def4e38d | 306 | static void *disk_seqf_next(struct seq_file *seqf, void *v, loff_t *pos) |
1da177e4 | 307 | { |
edfaa7c3 | 308 | struct device *dev; |
1da177e4 | 309 | |
def4e38d TH |
310 | (*pos)++; |
311 | dev = class_dev_iter_next(seqf->private); | |
2ac3cee5 | 312 | if (dev) |
68c4d4a7 | 313 | return dev_to_disk(dev); |
2ac3cee5 | 314 | |
1da177e4 LT |
315 | return NULL; |
316 | } | |
317 | ||
def4e38d | 318 | static void disk_seqf_stop(struct seq_file *seqf, void *v) |
27f30251 | 319 | { |
def4e38d | 320 | struct class_dev_iter *iter = seqf->private; |
27f30251 | 321 | |
def4e38d TH |
322 | /* stop is called even after start failed :-( */ |
323 | if (iter) { | |
324 | class_dev_iter_exit(iter); | |
325 | kfree(iter); | |
5c0ef6d0 | 326 | } |
1da177e4 LT |
327 | } |
328 | ||
def4e38d | 329 | static void *show_partition_start(struct seq_file *seqf, loff_t *pos) |
1da177e4 | 330 | { |
def4e38d TH |
331 | static void *p; |
332 | ||
333 | p = disk_seqf_start(seqf, pos); | |
334 | if (!IS_ERR(p) && p) | |
335 | seq_puts(seqf, "major minor #blocks name\n\n"); | |
336 | return p; | |
1da177e4 LT |
337 | } |
338 | ||
cf771cb5 | 339 | static int show_partition(struct seq_file *seqf, void *v) |
1da177e4 LT |
340 | { |
341 | struct gendisk *sgp = v; | |
342 | int n; | |
343 | char buf[BDEVNAME_SIZE]; | |
344 | ||
1da177e4 LT |
345 | /* Don't show non-partitionable removeable devices or empty devices */ |
346 | if (!get_capacity(sgp) || | |
347 | (sgp->minors == 1 && (sgp->flags & GENHD_FL_REMOVABLE))) | |
348 | return 0; | |
349 | if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO) | |
350 | return 0; | |
351 | ||
352 | /* show the full disk and all non-0 size partitions of it */ | |
cf771cb5 | 353 | seq_printf(seqf, "%4d %4d %10llu %s\n", |
1da177e4 LT |
354 | sgp->major, sgp->first_minor, |
355 | (unsigned long long)get_capacity(sgp) >> 1, | |
356 | disk_name(sgp, 0, buf)); | |
357 | for (n = 0; n < sgp->minors - 1; n++) { | |
358 | if (!sgp->part[n]) | |
359 | continue; | |
360 | if (sgp->part[n]->nr_sects == 0) | |
361 | continue; | |
cf771cb5 | 362 | seq_printf(seqf, "%4d %4d %10llu %s\n", |
1da177e4 LT |
363 | sgp->major, n + 1 + sgp->first_minor, |
364 | (unsigned long long)sgp->part[n]->nr_sects >> 1 , | |
365 | disk_name(sgp, n + 1, buf)); | |
366 | } | |
367 | ||
368 | return 0; | |
369 | } | |
370 | ||
12f32bb3 | 371 | const struct seq_operations partitions_op = { |
def4e38d TH |
372 | .start = show_partition_start, |
373 | .next = disk_seqf_next, | |
374 | .stop = disk_seqf_stop, | |
edfaa7c3 | 375 | .show = show_partition |
1da177e4 LT |
376 | }; |
377 | #endif | |
378 | ||
379 | ||
cf771cb5 | 380 | static struct kobject *base_probe(dev_t devt, int *partno, void *data) |
1da177e4 | 381 | { |
edfaa7c3 | 382 | if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0) |
1da177e4 | 383 | /* Make old-style 2.4 aliases work */ |
edfaa7c3 | 384 | request_module("block-major-%d", MAJOR(devt)); |
1da177e4 LT |
385 | return NULL; |
386 | } | |
387 | ||
388 | static int __init genhd_device_init(void) | |
389 | { | |
e105b8bf DW |
390 | int error; |
391 | ||
392 | block_class.dev_kobj = sysfs_dev_block_kobj; | |
393 | error = class_register(&block_class); | |
ee27a558 RM |
394 | if (unlikely(error)) |
395 | return error; | |
edfaa7c3 | 396 | bdev_map = kobj_map_init(base_probe, &block_class_lock); |
1da177e4 | 397 | blk_dev_init(); |
edfaa7c3 KS |
398 | |
399 | #ifndef CONFIG_SYSFS_DEPRECATED | |
400 | /* create top-level block dir */ | |
401 | block_depr = kobject_create_and_add("block", NULL); | |
402 | #endif | |
830d3cfb | 403 | return 0; |
1da177e4 LT |
404 | } |
405 | ||
406 | subsys_initcall(genhd_device_init); | |
407 | ||
edfaa7c3 KS |
408 | static ssize_t disk_range_show(struct device *dev, |
409 | struct device_attribute *attr, char *buf) | |
1da177e4 | 410 | { |
edfaa7c3 | 411 | struct gendisk *disk = dev_to_disk(dev); |
1da177e4 | 412 | |
edfaa7c3 | 413 | return sprintf(buf, "%d\n", disk->minors); |
1da177e4 LT |
414 | } |
415 | ||
edfaa7c3 KS |
416 | static ssize_t disk_removable_show(struct device *dev, |
417 | struct device_attribute *attr, char *buf) | |
a7fd6706 | 418 | { |
edfaa7c3 | 419 | struct gendisk *disk = dev_to_disk(dev); |
a7fd6706 | 420 | |
edfaa7c3 KS |
421 | return sprintf(buf, "%d\n", |
422 | (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); | |
a7fd6706 KS |
423 | } |
424 | ||
1c9ce527 KS |
425 | static ssize_t disk_ro_show(struct device *dev, |
426 | struct device_attribute *attr, char *buf) | |
427 | { | |
428 | struct gendisk *disk = dev_to_disk(dev); | |
429 | ||
430 | return sprintf(buf, "%d\n", disk->policy ? 1 : 0); | |
431 | } | |
432 | ||
edfaa7c3 KS |
433 | static ssize_t disk_size_show(struct device *dev, |
434 | struct device_attribute *attr, char *buf) | |
a7fd6706 | 435 | { |
edfaa7c3 | 436 | struct gendisk *disk = dev_to_disk(dev); |
1da177e4 | 437 | |
edfaa7c3 | 438 | return sprintf(buf, "%llu\n", (unsigned long long)get_capacity(disk)); |
1da177e4 | 439 | } |
edfaa7c3 KS |
440 | |
441 | static ssize_t disk_capability_show(struct device *dev, | |
442 | struct device_attribute *attr, char *buf) | |
86ce18d7 | 443 | { |
edfaa7c3 KS |
444 | struct gendisk *disk = dev_to_disk(dev); |
445 | ||
446 | return sprintf(buf, "%x\n", disk->flags); | |
86ce18d7 | 447 | } |
edfaa7c3 KS |
448 | |
449 | static ssize_t disk_stat_show(struct device *dev, | |
450 | struct device_attribute *attr, char *buf) | |
1da177e4 | 451 | { |
edfaa7c3 KS |
452 | struct gendisk *disk = dev_to_disk(dev); |
453 | ||
1da177e4 LT |
454 | preempt_disable(); |
455 | disk_round_stats(disk); | |
456 | preempt_enable(); | |
edfaa7c3 | 457 | return sprintf(buf, |
837c7878 BW |
458 | "%8lu %8lu %8llu %8u " |
459 | "%8lu %8lu %8llu %8u " | |
1da177e4 LT |
460 | "%8u %8u %8u" |
461 | "\n", | |
47a00410 JA |
462 | disk_stat_read(disk, ios[READ]), |
463 | disk_stat_read(disk, merges[READ]), | |
464 | (unsigned long long)disk_stat_read(disk, sectors[READ]), | |
465 | jiffies_to_msecs(disk_stat_read(disk, ticks[READ])), | |
466 | disk_stat_read(disk, ios[WRITE]), | |
467 | disk_stat_read(disk, merges[WRITE]), | |
468 | (unsigned long long)disk_stat_read(disk, sectors[WRITE]), | |
469 | jiffies_to_msecs(disk_stat_read(disk, ticks[WRITE])), | |
1da177e4 LT |
470 | disk->in_flight, |
471 | jiffies_to_msecs(disk_stat_read(disk, io_ticks)), | |
472 | jiffies_to_msecs(disk_stat_read(disk, time_in_queue))); | |
473 | } | |
1da177e4 | 474 | |
c17bb495 | 475 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 KS |
476 | static ssize_t disk_fail_show(struct device *dev, |
477 | struct device_attribute *attr, char *buf) | |
478 | { | |
479 | struct gendisk *disk = dev_to_disk(dev); | |
480 | ||
481 | return sprintf(buf, "%d\n", disk->flags & GENHD_FL_FAIL ? 1 : 0); | |
482 | } | |
c17bb495 | 483 | |
edfaa7c3 KS |
484 | static ssize_t disk_fail_store(struct device *dev, |
485 | struct device_attribute *attr, | |
c17bb495 AM |
486 | const char *buf, size_t count) |
487 | { | |
edfaa7c3 | 488 | struct gendisk *disk = dev_to_disk(dev); |
c17bb495 AM |
489 | int i; |
490 | ||
491 | if (count > 0 && sscanf(buf, "%d", &i) > 0) { | |
492 | if (i == 0) | |
493 | disk->flags &= ~GENHD_FL_FAIL; | |
494 | else | |
495 | disk->flags |= GENHD_FL_FAIL; | |
496 | } | |
497 | ||
498 | return count; | |
499 | } | |
c17bb495 AM |
500 | |
501 | #endif | |
502 | ||
edfaa7c3 KS |
503 | static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL); |
504 | static DEVICE_ATTR(removable, S_IRUGO, disk_removable_show, NULL); | |
1c9ce527 | 505 | static DEVICE_ATTR(ro, S_IRUGO, disk_ro_show, NULL); |
edfaa7c3 KS |
506 | static DEVICE_ATTR(size, S_IRUGO, disk_size_show, NULL); |
507 | static DEVICE_ATTR(capability, S_IRUGO, disk_capability_show, NULL); | |
508 | static DEVICE_ATTR(stat, S_IRUGO, disk_stat_show, NULL); | |
c17bb495 | 509 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 KS |
510 | static struct device_attribute dev_attr_fail = |
511 | __ATTR(make-it-fail, S_IRUGO|S_IWUSR, disk_fail_show, disk_fail_store); | |
c17bb495 | 512 | #endif |
edfaa7c3 KS |
513 | |
514 | static struct attribute *disk_attrs[] = { | |
515 | &dev_attr_range.attr, | |
516 | &dev_attr_removable.attr, | |
1c9ce527 | 517 | &dev_attr_ro.attr, |
edfaa7c3 KS |
518 | &dev_attr_size.attr, |
519 | &dev_attr_capability.attr, | |
520 | &dev_attr_stat.attr, | |
521 | #ifdef CONFIG_FAIL_MAKE_REQUEST | |
522 | &dev_attr_fail.attr, | |
523 | #endif | |
524 | NULL | |
525 | }; | |
526 | ||
527 | static struct attribute_group disk_attr_group = { | |
528 | .attrs = disk_attrs, | |
529 | }; | |
530 | ||
531 | static struct attribute_group *disk_attr_groups[] = { | |
532 | &disk_attr_group, | |
533 | NULL | |
1da177e4 LT |
534 | }; |
535 | ||
edfaa7c3 | 536 | static void disk_release(struct device *dev) |
1da177e4 | 537 | { |
edfaa7c3 KS |
538 | struct gendisk *disk = dev_to_disk(dev); |
539 | ||
1da177e4 LT |
540 | kfree(disk->random); |
541 | kfree(disk->part); | |
542 | free_disk_stats(disk); | |
543 | kfree(disk); | |
544 | } | |
edfaa7c3 KS |
545 | struct class block_class = { |
546 | .name = "block", | |
1da177e4 LT |
547 | }; |
548 | ||
1826eadf | 549 | static struct device_type disk_type = { |
edfaa7c3 KS |
550 | .name = "disk", |
551 | .groups = disk_attr_groups, | |
552 | .release = disk_release, | |
1da177e4 LT |
553 | }; |
554 | ||
a6e2ba88 | 555 | #ifdef CONFIG_PROC_FS |
cf771cb5 TH |
556 | /* |
557 | * aggregate disk stat collector. Uses the same stats that the sysfs | |
558 | * entries do, above, but makes them available through one seq_file. | |
559 | * | |
560 | * The output looks suspiciously like /proc/partitions with a bunch of | |
561 | * extra fields. | |
562 | */ | |
563 | static int diskstats_show(struct seq_file *seqf, void *v) | |
1da177e4 LT |
564 | { |
565 | struct gendisk *gp = v; | |
566 | char buf[BDEVNAME_SIZE]; | |
310a2c10 | 567 | int n; |
1da177e4 LT |
568 | |
569 | /* | |
edfaa7c3 | 570 | if (&gp->dev.kobj.entry == block_class.devices.next) |
cf771cb5 | 571 | seq_puts(seqf, "major minor name" |
1da177e4 LT |
572 | " rio rmerge rsect ruse wio wmerge " |
573 | "wsect wuse running use aveq" | |
574 | "\n\n"); | |
575 | */ | |
576 | ||
577 | preempt_disable(); | |
578 | disk_round_stats(gp); | |
579 | preempt_enable(); | |
cf771cb5 | 580 | seq_printf(seqf, "%4d %4d %s %lu %lu %llu %u %lu %lu %llu %u %u %u %u\n", |
310a2c10 | 581 | gp->major, gp->first_minor, disk_name(gp, 0, buf), |
a362357b JA |
582 | disk_stat_read(gp, ios[0]), disk_stat_read(gp, merges[0]), |
583 | (unsigned long long)disk_stat_read(gp, sectors[0]), | |
584 | jiffies_to_msecs(disk_stat_read(gp, ticks[0])), | |
585 | disk_stat_read(gp, ios[1]), disk_stat_read(gp, merges[1]), | |
586 | (unsigned long long)disk_stat_read(gp, sectors[1]), | |
587 | jiffies_to_msecs(disk_stat_read(gp, ticks[1])), | |
1da177e4 LT |
588 | gp->in_flight, |
589 | jiffies_to_msecs(disk_stat_read(gp, io_ticks)), | |
590 | jiffies_to_msecs(disk_stat_read(gp, time_in_queue))); | |
591 | ||
592 | /* now show all non-0 size partitions of it */ | |
593 | for (n = 0; n < gp->minors - 1; n++) { | |
594 | struct hd_struct *hd = gp->part[n]; | |
595 | ||
28f39d55 JM |
596 | if (!hd || !hd->nr_sects) |
597 | continue; | |
598 | ||
599 | preempt_disable(); | |
600 | part_round_stats(hd); | |
601 | preempt_enable(); | |
cf771cb5 | 602 | seq_printf(seqf, "%4d %4d %s %lu %lu %llu " |
28f39d55 JM |
603 | "%u %lu %lu %llu %u %u %u %u\n", |
604 | gp->major, n + gp->first_minor + 1, | |
605 | disk_name(gp, n + 1, buf), | |
606 | part_stat_read(hd, ios[0]), | |
607 | part_stat_read(hd, merges[0]), | |
608 | (unsigned long long)part_stat_read(hd, sectors[0]), | |
609 | jiffies_to_msecs(part_stat_read(hd, ticks[0])), | |
610 | part_stat_read(hd, ios[1]), | |
611 | part_stat_read(hd, merges[1]), | |
612 | (unsigned long long)part_stat_read(hd, sectors[1]), | |
613 | jiffies_to_msecs(part_stat_read(hd, ticks[1])), | |
614 | hd->in_flight, | |
615 | jiffies_to_msecs(part_stat_read(hd, io_ticks)), | |
616 | jiffies_to_msecs(part_stat_read(hd, time_in_queue)) | |
617 | ); | |
1da177e4 LT |
618 | } |
619 | ||
620 | return 0; | |
621 | } | |
622 | ||
12f32bb3 | 623 | const struct seq_operations diskstats_op = { |
def4e38d TH |
624 | .start = disk_seqf_start, |
625 | .next = disk_seqf_next, | |
626 | .stop = disk_seqf_stop, | |
1da177e4 LT |
627 | .show = diskstats_show |
628 | }; | |
a6e2ba88 | 629 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 630 | |
8ce7ad7b KCA |
631 | static void media_change_notify_thread(struct work_struct *work) |
632 | { | |
633 | struct gendisk *gd = container_of(work, struct gendisk, async_notify); | |
634 | char event[] = "MEDIA_CHANGE=1"; | |
635 | char *envp[] = { event, NULL }; | |
636 | ||
637 | /* | |
638 | * set enviroment vars to indicate which event this is for | |
639 | * so that user space will know to go check the media status. | |
640 | */ | |
edfaa7c3 | 641 | kobject_uevent_env(&gd->dev.kobj, KOBJ_CHANGE, envp); |
8ce7ad7b KCA |
642 | put_device(gd->driverfs_dev); |
643 | } | |
644 | ||
1826eadf | 645 | #if 0 |
8ce7ad7b KCA |
646 | void genhd_media_change_notify(struct gendisk *disk) |
647 | { | |
648 | get_device(disk->driverfs_dev); | |
649 | schedule_work(&disk->async_notify); | |
650 | } | |
651 | EXPORT_SYMBOL_GPL(genhd_media_change_notify); | |
1826eadf | 652 | #endif /* 0 */ |
8ce7ad7b | 653 | |
cf771cb5 | 654 | dev_t blk_lookup_devt(const char *name, int partno) |
a142be85 | 655 | { |
def4e38d TH |
656 | dev_t devt = MKDEV(0, 0); |
657 | struct class_dev_iter iter; | |
658 | struct device *dev; | |
a142be85 | 659 | |
def4e38d TH |
660 | class_dev_iter_init(&iter, &block_class, NULL, &disk_type); |
661 | while ((dev = class_dev_iter_next(&iter))) { | |
a142be85 | 662 | struct gendisk *disk = dev_to_disk(dev); |
a142be85 | 663 | |
cf771cb5 | 664 | if (!strcmp(dev->bus_id, name) && partno < disk->minors) { |
def4e38d | 665 | devt = MKDEV(MAJOR(dev->devt), |
cf771cb5 | 666 | MINOR(dev->devt) + partno); |
def4e38d TH |
667 | break; |
668 | } | |
5c0ef6d0 | 669 | } |
def4e38d | 670 | class_dev_iter_exit(&iter); |
edfaa7c3 KS |
671 | return devt; |
672 | } | |
edfaa7c3 KS |
673 | EXPORT_SYMBOL(blk_lookup_devt); |
674 | ||
1da177e4 LT |
675 | struct gendisk *alloc_disk(int minors) |
676 | { | |
1946089a CL |
677 | return alloc_disk_node(minors, -1); |
678 | } | |
679 | ||
680 | struct gendisk *alloc_disk_node(int minors, int node_id) | |
681 | { | |
682 | struct gendisk *disk; | |
683 | ||
94f6030c CL |
684 | disk = kmalloc_node(sizeof(struct gendisk), |
685 | GFP_KERNEL | __GFP_ZERO, node_id); | |
1da177e4 | 686 | if (disk) { |
1da177e4 LT |
687 | if (!init_disk_stats(disk)) { |
688 | kfree(disk); | |
689 | return NULL; | |
690 | } | |
691 | if (minors > 1) { | |
692 | int size = (minors - 1) * sizeof(struct hd_struct *); | |
94f6030c CL |
693 | disk->part = kmalloc_node(size, |
694 | GFP_KERNEL | __GFP_ZERO, node_id); | |
1da177e4 | 695 | if (!disk->part) { |
c7674030 | 696 | free_disk_stats(disk); |
1da177e4 LT |
697 | kfree(disk); |
698 | return NULL; | |
699 | } | |
1da177e4 LT |
700 | } |
701 | disk->minors = minors; | |
1da177e4 | 702 | rand_initialize_disk(disk); |
edfaa7c3 KS |
703 | disk->dev.class = &block_class; |
704 | disk->dev.type = &disk_type; | |
705 | device_initialize(&disk->dev); | |
8ce7ad7b KCA |
706 | INIT_WORK(&disk->async_notify, |
707 | media_change_notify_thread); | |
1da177e4 LT |
708 | } |
709 | return disk; | |
710 | } | |
711 | ||
712 | EXPORT_SYMBOL(alloc_disk); | |
1946089a | 713 | EXPORT_SYMBOL(alloc_disk_node); |
1da177e4 LT |
714 | |
715 | struct kobject *get_disk(struct gendisk *disk) | |
716 | { | |
717 | struct module *owner; | |
718 | struct kobject *kobj; | |
719 | ||
720 | if (!disk->fops) | |
721 | return NULL; | |
722 | owner = disk->fops->owner; | |
723 | if (owner && !try_module_get(owner)) | |
724 | return NULL; | |
edfaa7c3 | 725 | kobj = kobject_get(&disk->dev.kobj); |
1da177e4 LT |
726 | if (kobj == NULL) { |
727 | module_put(owner); | |
728 | return NULL; | |
729 | } | |
730 | return kobj; | |
731 | ||
732 | } | |
733 | ||
734 | EXPORT_SYMBOL(get_disk); | |
735 | ||
736 | void put_disk(struct gendisk *disk) | |
737 | { | |
738 | if (disk) | |
edfaa7c3 | 739 | kobject_put(&disk->dev.kobj); |
1da177e4 LT |
740 | } |
741 | ||
742 | EXPORT_SYMBOL(put_disk); | |
743 | ||
744 | void set_device_ro(struct block_device *bdev, int flag) | |
745 | { | |
746 | if (bdev->bd_contains != bdev) | |
747 | bdev->bd_part->policy = flag; | |
748 | else | |
749 | bdev->bd_disk->policy = flag; | |
750 | } | |
751 | ||
752 | EXPORT_SYMBOL(set_device_ro); | |
753 | ||
754 | void set_disk_ro(struct gendisk *disk, int flag) | |
755 | { | |
756 | int i; | |
757 | disk->policy = flag; | |
758 | for (i = 0; i < disk->minors - 1; i++) | |
759 | if (disk->part[i]) disk->part[i]->policy = flag; | |
760 | } | |
761 | ||
762 | EXPORT_SYMBOL(set_disk_ro); | |
763 | ||
764 | int bdev_read_only(struct block_device *bdev) | |
765 | { | |
766 | if (!bdev) | |
767 | return 0; | |
768 | else if (bdev->bd_contains != bdev) | |
769 | return bdev->bd_part->policy; | |
770 | else | |
771 | return bdev->bd_disk->policy; | |
772 | } | |
773 | ||
774 | EXPORT_SYMBOL(bdev_read_only); | |
775 | ||
cf771cb5 | 776 | int invalidate_partition(struct gendisk *disk, int partno) |
1da177e4 LT |
777 | { |
778 | int res = 0; | |
cf771cb5 | 779 | struct block_device *bdev = bdget_disk(disk, partno); |
1da177e4 | 780 | if (bdev) { |
2ef41634 CH |
781 | fsync_bdev(bdev); |
782 | res = __invalidate_device(bdev); | |
1da177e4 LT |
783 | bdput(bdev); |
784 | } | |
785 | return res; | |
786 | } | |
787 | ||
788 | EXPORT_SYMBOL(invalidate_partition); |