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Commit | Line | Data |
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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 | 188 | disk->flags |= GENHD_FL_UP; |
f331c029 TH |
189 | disk->dev.devt = MKDEV(disk->major, disk->first_minor); |
190 | blk_register_region(disk_devt(disk), disk->minors, NULL, | |
191 | exact_match, exact_lock, disk); | |
1da177e4 LT |
192 | register_disk(disk); |
193 | blk_register_queue(disk); | |
cf0ca9fe PZ |
194 | |
195 | bdi = &disk->queue->backing_dev_info; | |
f331c029 | 196 | bdi_register_dev(bdi, disk_devt(disk)); |
6ffeea77 GKH |
197 | retval = sysfs_create_link(&disk->dev.kobj, &bdi->dev->kobj, "bdi"); |
198 | WARN_ON(retval); | |
1da177e4 LT |
199 | } |
200 | ||
201 | EXPORT_SYMBOL(add_disk); | |
202 | EXPORT_SYMBOL(del_gendisk); /* in partitions/check.c */ | |
203 | ||
204 | void unlink_gendisk(struct gendisk *disk) | |
205 | { | |
cf0ca9fe PZ |
206 | sysfs_remove_link(&disk->dev.kobj, "bdi"); |
207 | bdi_unregister(&disk->queue->backing_dev_info); | |
1da177e4 | 208 | blk_unregister_queue(disk); |
f331c029 | 209 | blk_unregister_region(disk_devt(disk), disk->minors); |
1da177e4 LT |
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 | ||
f331c029 TH |
228 | /** |
229 | * bdget_disk - do bdget() by gendisk and partition number | |
230 | * @disk: gendisk of interest | |
231 | * @partno: partition number | |
232 | * | |
233 | * Find partition @partno from @disk, do bdget() on it. | |
234 | * | |
235 | * CONTEXT: | |
236 | * Don't care. | |
237 | * | |
238 | * RETURNS: | |
239 | * Resulting block_device on success, NULL on failure. | |
240 | */ | |
241 | extern struct block_device *bdget_disk(struct gendisk *disk, int partno) | |
242 | { | |
243 | dev_t devt = MKDEV(0, 0); | |
244 | ||
245 | if (partno == 0) | |
246 | devt = disk_devt(disk); | |
247 | else { | |
248 | struct hd_struct *part = disk->part[partno - 1]; | |
249 | ||
250 | if (part && part->nr_sects) | |
251 | devt = part_devt(part); | |
252 | } | |
253 | ||
254 | if (likely(devt != MKDEV(0, 0))) | |
255 | return bdget(devt); | |
256 | return NULL; | |
257 | } | |
258 | EXPORT_SYMBOL(bdget_disk); | |
259 | ||
5c6f35c5 GKH |
260 | /* |
261 | * print a full list of all partitions - intended for places where the root | |
262 | * filesystem can't be mounted and thus to give the victim some idea of what | |
263 | * went wrong | |
264 | */ | |
265 | void __init printk_all_partitions(void) | |
266 | { | |
def4e38d TH |
267 | struct class_dev_iter iter; |
268 | struct device *dev; | |
269 | ||
270 | class_dev_iter_init(&iter, &block_class, NULL, &disk_type); | |
271 | while ((dev = class_dev_iter_next(&iter))) { | |
272 | struct gendisk *disk = dev_to_disk(dev); | |
273 | char buf[BDEVNAME_SIZE]; | |
274 | int n; | |
275 | ||
276 | /* | |
277 | * Don't show empty devices or things that have been | |
278 | * surpressed | |
279 | */ | |
280 | if (get_capacity(disk) == 0 || | |
281 | (disk->flags & GENHD_FL_SUPPRESS_PARTITION_INFO)) | |
282 | continue; | |
283 | ||
284 | /* | |
285 | * Note, unlike /proc/partitions, I am showing the | |
286 | * numbers in hex - the same format as the root= | |
287 | * option takes. | |
288 | */ | |
289 | printk("%02x%02x %10llu %s", | |
f331c029 | 290 | MAJOR(disk_devt(disk)), MINOR(disk_devt(disk)), |
def4e38d TH |
291 | (unsigned long long)get_capacity(disk) >> 1, |
292 | disk_name(disk, 0, buf)); | |
293 | if (disk->driverfs_dev != NULL && | |
294 | disk->driverfs_dev->driver != NULL) | |
295 | printk(" driver: %s\n", | |
296 | disk->driverfs_dev->driver->name); | |
297 | else | |
298 | printk(" (driver?)\n"); | |
299 | ||
300 | /* now show the partitions */ | |
f331c029 TH |
301 | for (n = 0; n < disk_max_parts(disk); ++n) { |
302 | struct hd_struct *part = disk->part[n]; | |
303 | ||
304 | if (!part || !part->nr_sects) | |
def4e38d TH |
305 | continue; |
306 | printk(" %02x%02x %10llu %s\n", | |
f331c029 TH |
307 | MAJOR(part_devt(part)), MINOR(part_devt(part)), |
308 | (unsigned long long)part->nr_sects >> 1, | |
309 | disk_name(disk, part->partno, buf)); | |
def4e38d TH |
310 | } |
311 | } | |
312 | class_dev_iter_exit(&iter); | |
dd2a345f DG |
313 | } |
314 | ||
1da177e4 LT |
315 | #ifdef CONFIG_PROC_FS |
316 | /* iterator */ | |
def4e38d | 317 | static void *disk_seqf_start(struct seq_file *seqf, loff_t *pos) |
68c4d4a7 | 318 | { |
def4e38d TH |
319 | loff_t skip = *pos; |
320 | struct class_dev_iter *iter; | |
321 | struct device *dev; | |
68c4d4a7 | 322 | |
def4e38d TH |
323 | iter = kmalloc(GFP_KERNEL, sizeof(*iter)); |
324 | if (!iter) | |
325 | return ERR_PTR(-ENOMEM); | |
326 | ||
327 | seqf->private = iter; | |
328 | class_dev_iter_init(iter, &block_class, NULL, &disk_type); | |
329 | do { | |
330 | dev = class_dev_iter_next(iter); | |
331 | if (!dev) | |
332 | return NULL; | |
333 | } while (skip--); | |
334 | ||
335 | return dev_to_disk(dev); | |
68c4d4a7 GKH |
336 | } |
337 | ||
def4e38d | 338 | static void *disk_seqf_next(struct seq_file *seqf, void *v, loff_t *pos) |
1da177e4 | 339 | { |
edfaa7c3 | 340 | struct device *dev; |
1da177e4 | 341 | |
def4e38d TH |
342 | (*pos)++; |
343 | dev = class_dev_iter_next(seqf->private); | |
2ac3cee5 | 344 | if (dev) |
68c4d4a7 | 345 | return dev_to_disk(dev); |
2ac3cee5 | 346 | |
1da177e4 LT |
347 | return NULL; |
348 | } | |
349 | ||
def4e38d | 350 | static void disk_seqf_stop(struct seq_file *seqf, void *v) |
27f30251 | 351 | { |
def4e38d | 352 | struct class_dev_iter *iter = seqf->private; |
27f30251 | 353 | |
def4e38d TH |
354 | /* stop is called even after start failed :-( */ |
355 | if (iter) { | |
356 | class_dev_iter_exit(iter); | |
357 | kfree(iter); | |
5c0ef6d0 | 358 | } |
1da177e4 LT |
359 | } |
360 | ||
def4e38d | 361 | static void *show_partition_start(struct seq_file *seqf, loff_t *pos) |
1da177e4 | 362 | { |
def4e38d TH |
363 | static void *p; |
364 | ||
365 | p = disk_seqf_start(seqf, pos); | |
366 | if (!IS_ERR(p) && p) | |
367 | seq_puts(seqf, "major minor #blocks name\n\n"); | |
368 | return p; | |
1da177e4 LT |
369 | } |
370 | ||
cf771cb5 | 371 | static int show_partition(struct seq_file *seqf, void *v) |
1da177e4 LT |
372 | { |
373 | struct gendisk *sgp = v; | |
374 | int n; | |
375 | char buf[BDEVNAME_SIZE]; | |
376 | ||
1da177e4 | 377 | /* Don't show non-partitionable removeable devices or empty devices */ |
f331c029 TH |
378 | if (!get_capacity(sgp) || (!disk_max_parts(sgp) && |
379 | (sgp->flags & GENHD_FL_REMOVABLE))) | |
1da177e4 LT |
380 | return 0; |
381 | if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO) | |
382 | return 0; | |
383 | ||
384 | /* show the full disk and all non-0 size partitions of it */ | |
cf771cb5 | 385 | seq_printf(seqf, "%4d %4d %10llu %s\n", |
f331c029 | 386 | MAJOR(disk_devt(sgp)), MINOR(disk_devt(sgp)), |
1da177e4 LT |
387 | (unsigned long long)get_capacity(sgp) >> 1, |
388 | disk_name(sgp, 0, buf)); | |
f331c029 TH |
389 | for (n = 0; n < disk_max_parts(sgp); n++) { |
390 | struct hd_struct *part = sgp->part[n]; | |
391 | if (!part) | |
1da177e4 | 392 | continue; |
f331c029 | 393 | if (part->nr_sects == 0) |
1da177e4 | 394 | continue; |
cf771cb5 | 395 | seq_printf(seqf, "%4d %4d %10llu %s\n", |
f331c029 TH |
396 | MAJOR(part_devt(part)), MINOR(part_devt(part)), |
397 | (unsigned long long)part->nr_sects >> 1, | |
398 | disk_name(sgp, part->partno, buf)); | |
1da177e4 LT |
399 | } |
400 | ||
401 | return 0; | |
402 | } | |
403 | ||
12f32bb3 | 404 | const struct seq_operations partitions_op = { |
def4e38d TH |
405 | .start = show_partition_start, |
406 | .next = disk_seqf_next, | |
407 | .stop = disk_seqf_stop, | |
edfaa7c3 | 408 | .show = show_partition |
1da177e4 LT |
409 | }; |
410 | #endif | |
411 | ||
412 | ||
cf771cb5 | 413 | static struct kobject *base_probe(dev_t devt, int *partno, void *data) |
1da177e4 | 414 | { |
edfaa7c3 | 415 | if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0) |
1da177e4 | 416 | /* Make old-style 2.4 aliases work */ |
edfaa7c3 | 417 | request_module("block-major-%d", MAJOR(devt)); |
1da177e4 LT |
418 | return NULL; |
419 | } | |
420 | ||
421 | static int __init genhd_device_init(void) | |
422 | { | |
e105b8bf DW |
423 | int error; |
424 | ||
425 | block_class.dev_kobj = sysfs_dev_block_kobj; | |
426 | error = class_register(&block_class); | |
ee27a558 RM |
427 | if (unlikely(error)) |
428 | return error; | |
edfaa7c3 | 429 | bdev_map = kobj_map_init(base_probe, &block_class_lock); |
1da177e4 | 430 | blk_dev_init(); |
edfaa7c3 KS |
431 | |
432 | #ifndef CONFIG_SYSFS_DEPRECATED | |
433 | /* create top-level block dir */ | |
434 | block_depr = kobject_create_and_add("block", NULL); | |
435 | #endif | |
830d3cfb | 436 | return 0; |
1da177e4 LT |
437 | } |
438 | ||
439 | subsys_initcall(genhd_device_init); | |
440 | ||
edfaa7c3 KS |
441 | static ssize_t disk_range_show(struct device *dev, |
442 | struct device_attribute *attr, char *buf) | |
1da177e4 | 443 | { |
edfaa7c3 | 444 | struct gendisk *disk = dev_to_disk(dev); |
1da177e4 | 445 | |
edfaa7c3 | 446 | return sprintf(buf, "%d\n", disk->minors); |
1da177e4 LT |
447 | } |
448 | ||
edfaa7c3 KS |
449 | static ssize_t disk_removable_show(struct device *dev, |
450 | struct device_attribute *attr, char *buf) | |
a7fd6706 | 451 | { |
edfaa7c3 | 452 | struct gendisk *disk = dev_to_disk(dev); |
a7fd6706 | 453 | |
edfaa7c3 KS |
454 | return sprintf(buf, "%d\n", |
455 | (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); | |
a7fd6706 KS |
456 | } |
457 | ||
1c9ce527 KS |
458 | static ssize_t disk_ro_show(struct device *dev, |
459 | struct device_attribute *attr, char *buf) | |
460 | { | |
461 | struct gendisk *disk = dev_to_disk(dev); | |
462 | ||
463 | return sprintf(buf, "%d\n", disk->policy ? 1 : 0); | |
464 | } | |
465 | ||
edfaa7c3 KS |
466 | static ssize_t disk_size_show(struct device *dev, |
467 | struct device_attribute *attr, char *buf) | |
a7fd6706 | 468 | { |
edfaa7c3 | 469 | struct gendisk *disk = dev_to_disk(dev); |
1da177e4 | 470 | |
edfaa7c3 | 471 | return sprintf(buf, "%llu\n", (unsigned long long)get_capacity(disk)); |
1da177e4 | 472 | } |
edfaa7c3 KS |
473 | |
474 | static ssize_t disk_capability_show(struct device *dev, | |
475 | struct device_attribute *attr, char *buf) | |
86ce18d7 | 476 | { |
edfaa7c3 KS |
477 | struct gendisk *disk = dev_to_disk(dev); |
478 | ||
479 | return sprintf(buf, "%x\n", disk->flags); | |
86ce18d7 | 480 | } |
edfaa7c3 KS |
481 | |
482 | static ssize_t disk_stat_show(struct device *dev, | |
483 | struct device_attribute *attr, char *buf) | |
1da177e4 | 484 | { |
edfaa7c3 KS |
485 | struct gendisk *disk = dev_to_disk(dev); |
486 | ||
1da177e4 LT |
487 | preempt_disable(); |
488 | disk_round_stats(disk); | |
489 | preempt_enable(); | |
edfaa7c3 | 490 | return sprintf(buf, |
837c7878 BW |
491 | "%8lu %8lu %8llu %8u " |
492 | "%8lu %8lu %8llu %8u " | |
1da177e4 LT |
493 | "%8u %8u %8u" |
494 | "\n", | |
47a00410 JA |
495 | disk_stat_read(disk, ios[READ]), |
496 | disk_stat_read(disk, merges[READ]), | |
497 | (unsigned long long)disk_stat_read(disk, sectors[READ]), | |
498 | jiffies_to_msecs(disk_stat_read(disk, ticks[READ])), | |
499 | disk_stat_read(disk, ios[WRITE]), | |
500 | disk_stat_read(disk, merges[WRITE]), | |
501 | (unsigned long long)disk_stat_read(disk, sectors[WRITE]), | |
502 | jiffies_to_msecs(disk_stat_read(disk, ticks[WRITE])), | |
1da177e4 LT |
503 | disk->in_flight, |
504 | jiffies_to_msecs(disk_stat_read(disk, io_ticks)), | |
505 | jiffies_to_msecs(disk_stat_read(disk, time_in_queue))); | |
506 | } | |
1da177e4 | 507 | |
c17bb495 | 508 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 KS |
509 | static ssize_t disk_fail_show(struct device *dev, |
510 | struct device_attribute *attr, char *buf) | |
511 | { | |
512 | struct gendisk *disk = dev_to_disk(dev); | |
513 | ||
514 | return sprintf(buf, "%d\n", disk->flags & GENHD_FL_FAIL ? 1 : 0); | |
515 | } | |
c17bb495 | 516 | |
edfaa7c3 KS |
517 | static ssize_t disk_fail_store(struct device *dev, |
518 | struct device_attribute *attr, | |
c17bb495 AM |
519 | const char *buf, size_t count) |
520 | { | |
edfaa7c3 | 521 | struct gendisk *disk = dev_to_disk(dev); |
c17bb495 AM |
522 | int i; |
523 | ||
524 | if (count > 0 && sscanf(buf, "%d", &i) > 0) { | |
525 | if (i == 0) | |
526 | disk->flags &= ~GENHD_FL_FAIL; | |
527 | else | |
528 | disk->flags |= GENHD_FL_FAIL; | |
529 | } | |
530 | ||
531 | return count; | |
532 | } | |
c17bb495 AM |
533 | |
534 | #endif | |
535 | ||
edfaa7c3 KS |
536 | static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL); |
537 | static DEVICE_ATTR(removable, S_IRUGO, disk_removable_show, NULL); | |
1c9ce527 | 538 | static DEVICE_ATTR(ro, S_IRUGO, disk_ro_show, NULL); |
edfaa7c3 KS |
539 | static DEVICE_ATTR(size, S_IRUGO, disk_size_show, NULL); |
540 | static DEVICE_ATTR(capability, S_IRUGO, disk_capability_show, NULL); | |
541 | static DEVICE_ATTR(stat, S_IRUGO, disk_stat_show, NULL); | |
c17bb495 | 542 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 KS |
543 | static struct device_attribute dev_attr_fail = |
544 | __ATTR(make-it-fail, S_IRUGO|S_IWUSR, disk_fail_show, disk_fail_store); | |
c17bb495 | 545 | #endif |
edfaa7c3 KS |
546 | |
547 | static struct attribute *disk_attrs[] = { | |
548 | &dev_attr_range.attr, | |
549 | &dev_attr_removable.attr, | |
1c9ce527 | 550 | &dev_attr_ro.attr, |
edfaa7c3 KS |
551 | &dev_attr_size.attr, |
552 | &dev_attr_capability.attr, | |
553 | &dev_attr_stat.attr, | |
554 | #ifdef CONFIG_FAIL_MAKE_REQUEST | |
555 | &dev_attr_fail.attr, | |
556 | #endif | |
557 | NULL | |
558 | }; | |
559 | ||
560 | static struct attribute_group disk_attr_group = { | |
561 | .attrs = disk_attrs, | |
562 | }; | |
563 | ||
564 | static struct attribute_group *disk_attr_groups[] = { | |
565 | &disk_attr_group, | |
566 | NULL | |
1da177e4 LT |
567 | }; |
568 | ||
edfaa7c3 | 569 | static void disk_release(struct device *dev) |
1da177e4 | 570 | { |
edfaa7c3 KS |
571 | struct gendisk *disk = dev_to_disk(dev); |
572 | ||
1da177e4 LT |
573 | kfree(disk->random); |
574 | kfree(disk->part); | |
575 | free_disk_stats(disk); | |
576 | kfree(disk); | |
577 | } | |
edfaa7c3 KS |
578 | struct class block_class = { |
579 | .name = "block", | |
1da177e4 LT |
580 | }; |
581 | ||
1826eadf | 582 | static struct device_type disk_type = { |
edfaa7c3 KS |
583 | .name = "disk", |
584 | .groups = disk_attr_groups, | |
585 | .release = disk_release, | |
1da177e4 LT |
586 | }; |
587 | ||
a6e2ba88 | 588 | #ifdef CONFIG_PROC_FS |
cf771cb5 TH |
589 | /* |
590 | * aggregate disk stat collector. Uses the same stats that the sysfs | |
591 | * entries do, above, but makes them available through one seq_file. | |
592 | * | |
593 | * The output looks suspiciously like /proc/partitions with a bunch of | |
594 | * extra fields. | |
595 | */ | |
596 | static int diskstats_show(struct seq_file *seqf, void *v) | |
1da177e4 LT |
597 | { |
598 | struct gendisk *gp = v; | |
599 | char buf[BDEVNAME_SIZE]; | |
310a2c10 | 600 | int n; |
1da177e4 LT |
601 | |
602 | /* | |
edfaa7c3 | 603 | if (&gp->dev.kobj.entry == block_class.devices.next) |
cf771cb5 | 604 | seq_puts(seqf, "major minor name" |
1da177e4 LT |
605 | " rio rmerge rsect ruse wio wmerge " |
606 | "wsect wuse running use aveq" | |
607 | "\n\n"); | |
608 | */ | |
609 | ||
610 | preempt_disable(); | |
611 | disk_round_stats(gp); | |
612 | preempt_enable(); | |
cf771cb5 | 613 | seq_printf(seqf, "%4d %4d %s %lu %lu %llu %u %lu %lu %llu %u %u %u %u\n", |
f331c029 TH |
614 | MAJOR(disk_devt(gp)), MINOR(disk_devt(gp)), |
615 | disk_name(gp, 0, buf), | |
a362357b JA |
616 | disk_stat_read(gp, ios[0]), disk_stat_read(gp, merges[0]), |
617 | (unsigned long long)disk_stat_read(gp, sectors[0]), | |
618 | jiffies_to_msecs(disk_stat_read(gp, ticks[0])), | |
619 | disk_stat_read(gp, ios[1]), disk_stat_read(gp, merges[1]), | |
620 | (unsigned long long)disk_stat_read(gp, sectors[1]), | |
621 | jiffies_to_msecs(disk_stat_read(gp, ticks[1])), | |
1da177e4 LT |
622 | gp->in_flight, |
623 | jiffies_to_msecs(disk_stat_read(gp, io_ticks)), | |
624 | jiffies_to_msecs(disk_stat_read(gp, time_in_queue))); | |
625 | ||
626 | /* now show all non-0 size partitions of it */ | |
f331c029 | 627 | for (n = 0; n < disk_max_parts(gp); n++) { |
1da177e4 LT |
628 | struct hd_struct *hd = gp->part[n]; |
629 | ||
28f39d55 JM |
630 | if (!hd || !hd->nr_sects) |
631 | continue; | |
632 | ||
633 | preempt_disable(); | |
634 | part_round_stats(hd); | |
635 | preempt_enable(); | |
cf771cb5 | 636 | seq_printf(seqf, "%4d %4d %s %lu %lu %llu " |
28f39d55 | 637 | "%u %lu %lu %llu %u %u %u %u\n", |
f331c029 TH |
638 | MAJOR(part_devt(hd)), MINOR(part_devt(hd)), |
639 | disk_name(gp, hd->partno, buf), | |
28f39d55 JM |
640 | part_stat_read(hd, ios[0]), |
641 | part_stat_read(hd, merges[0]), | |
642 | (unsigned long long)part_stat_read(hd, sectors[0]), | |
643 | jiffies_to_msecs(part_stat_read(hd, ticks[0])), | |
644 | part_stat_read(hd, ios[1]), | |
645 | part_stat_read(hd, merges[1]), | |
646 | (unsigned long long)part_stat_read(hd, sectors[1]), | |
647 | jiffies_to_msecs(part_stat_read(hd, ticks[1])), | |
648 | hd->in_flight, | |
649 | jiffies_to_msecs(part_stat_read(hd, io_ticks)), | |
650 | jiffies_to_msecs(part_stat_read(hd, time_in_queue)) | |
651 | ); | |
1da177e4 LT |
652 | } |
653 | ||
654 | return 0; | |
655 | } | |
656 | ||
12f32bb3 | 657 | const struct seq_operations diskstats_op = { |
def4e38d TH |
658 | .start = disk_seqf_start, |
659 | .next = disk_seqf_next, | |
660 | .stop = disk_seqf_stop, | |
1da177e4 LT |
661 | .show = diskstats_show |
662 | }; | |
a6e2ba88 | 663 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 664 | |
8ce7ad7b KCA |
665 | static void media_change_notify_thread(struct work_struct *work) |
666 | { | |
667 | struct gendisk *gd = container_of(work, struct gendisk, async_notify); | |
668 | char event[] = "MEDIA_CHANGE=1"; | |
669 | char *envp[] = { event, NULL }; | |
670 | ||
671 | /* | |
672 | * set enviroment vars to indicate which event this is for | |
673 | * so that user space will know to go check the media status. | |
674 | */ | |
edfaa7c3 | 675 | kobject_uevent_env(&gd->dev.kobj, KOBJ_CHANGE, envp); |
8ce7ad7b KCA |
676 | put_device(gd->driverfs_dev); |
677 | } | |
678 | ||
1826eadf | 679 | #if 0 |
8ce7ad7b KCA |
680 | void genhd_media_change_notify(struct gendisk *disk) |
681 | { | |
682 | get_device(disk->driverfs_dev); | |
683 | schedule_work(&disk->async_notify); | |
684 | } | |
685 | EXPORT_SYMBOL_GPL(genhd_media_change_notify); | |
1826eadf | 686 | #endif /* 0 */ |
8ce7ad7b | 687 | |
cf771cb5 | 688 | dev_t blk_lookup_devt(const char *name, int partno) |
a142be85 | 689 | { |
def4e38d TH |
690 | dev_t devt = MKDEV(0, 0); |
691 | struct class_dev_iter iter; | |
692 | struct device *dev; | |
a142be85 | 693 | |
def4e38d TH |
694 | class_dev_iter_init(&iter, &block_class, NULL, &disk_type); |
695 | while ((dev = class_dev_iter_next(&iter))) { | |
a142be85 | 696 | struct gendisk *disk = dev_to_disk(dev); |
a142be85 | 697 | |
f331c029 TH |
698 | if (strcmp(dev->bus_id, name)) |
699 | continue; | |
700 | if (partno < 0 || partno > disk_max_parts(disk)) | |
701 | continue; | |
702 | ||
703 | if (partno == 0) | |
704 | devt = disk_devt(disk); | |
705 | else { | |
706 | struct hd_struct *part = disk->part[partno - 1]; | |
707 | ||
708 | if (!part || !part->nr_sects) | |
709 | continue; | |
710 | ||
711 | devt = part_devt(part); | |
def4e38d | 712 | } |
f331c029 | 713 | break; |
5c0ef6d0 | 714 | } |
def4e38d | 715 | class_dev_iter_exit(&iter); |
edfaa7c3 KS |
716 | return devt; |
717 | } | |
edfaa7c3 KS |
718 | EXPORT_SYMBOL(blk_lookup_devt); |
719 | ||
1da177e4 LT |
720 | struct gendisk *alloc_disk(int minors) |
721 | { | |
1946089a CL |
722 | return alloc_disk_node(minors, -1); |
723 | } | |
724 | ||
725 | struct gendisk *alloc_disk_node(int minors, int node_id) | |
726 | { | |
727 | struct gendisk *disk; | |
728 | ||
94f6030c CL |
729 | disk = kmalloc_node(sizeof(struct gendisk), |
730 | GFP_KERNEL | __GFP_ZERO, node_id); | |
1da177e4 | 731 | if (disk) { |
1da177e4 LT |
732 | if (!init_disk_stats(disk)) { |
733 | kfree(disk); | |
734 | return NULL; | |
735 | } | |
736 | if (minors > 1) { | |
737 | int size = (minors - 1) * sizeof(struct hd_struct *); | |
94f6030c CL |
738 | disk->part = kmalloc_node(size, |
739 | GFP_KERNEL | __GFP_ZERO, node_id); | |
1da177e4 | 740 | if (!disk->part) { |
c7674030 | 741 | free_disk_stats(disk); |
1da177e4 LT |
742 | kfree(disk); |
743 | return NULL; | |
744 | } | |
1da177e4 LT |
745 | } |
746 | disk->minors = minors; | |
1da177e4 | 747 | rand_initialize_disk(disk); |
edfaa7c3 KS |
748 | disk->dev.class = &block_class; |
749 | disk->dev.type = &disk_type; | |
750 | device_initialize(&disk->dev); | |
8ce7ad7b KCA |
751 | INIT_WORK(&disk->async_notify, |
752 | media_change_notify_thread); | |
1da177e4 LT |
753 | } |
754 | return disk; | |
755 | } | |
756 | ||
757 | EXPORT_SYMBOL(alloc_disk); | |
1946089a | 758 | EXPORT_SYMBOL(alloc_disk_node); |
1da177e4 LT |
759 | |
760 | struct kobject *get_disk(struct gendisk *disk) | |
761 | { | |
762 | struct module *owner; | |
763 | struct kobject *kobj; | |
764 | ||
765 | if (!disk->fops) | |
766 | return NULL; | |
767 | owner = disk->fops->owner; | |
768 | if (owner && !try_module_get(owner)) | |
769 | return NULL; | |
edfaa7c3 | 770 | kobj = kobject_get(&disk->dev.kobj); |
1da177e4 LT |
771 | if (kobj == NULL) { |
772 | module_put(owner); | |
773 | return NULL; | |
774 | } | |
775 | return kobj; | |
776 | ||
777 | } | |
778 | ||
779 | EXPORT_SYMBOL(get_disk); | |
780 | ||
781 | void put_disk(struct gendisk *disk) | |
782 | { | |
783 | if (disk) | |
edfaa7c3 | 784 | kobject_put(&disk->dev.kobj); |
1da177e4 LT |
785 | } |
786 | ||
787 | EXPORT_SYMBOL(put_disk); | |
788 | ||
789 | void set_device_ro(struct block_device *bdev, int flag) | |
790 | { | |
791 | if (bdev->bd_contains != bdev) | |
792 | bdev->bd_part->policy = flag; | |
793 | else | |
794 | bdev->bd_disk->policy = flag; | |
795 | } | |
796 | ||
797 | EXPORT_SYMBOL(set_device_ro); | |
798 | ||
799 | void set_disk_ro(struct gendisk *disk, int flag) | |
800 | { | |
801 | int i; | |
802 | disk->policy = flag; | |
f331c029 | 803 | for (i = 0; i < disk_max_parts(disk); i++) |
1da177e4 LT |
804 | if (disk->part[i]) disk->part[i]->policy = flag; |
805 | } | |
806 | ||
807 | EXPORT_SYMBOL(set_disk_ro); | |
808 | ||
809 | int bdev_read_only(struct block_device *bdev) | |
810 | { | |
811 | if (!bdev) | |
812 | return 0; | |
813 | else if (bdev->bd_contains != bdev) | |
814 | return bdev->bd_part->policy; | |
815 | else | |
816 | return bdev->bd_disk->policy; | |
817 | } | |
818 | ||
819 | EXPORT_SYMBOL(bdev_read_only); | |
820 | ||
cf771cb5 | 821 | int invalidate_partition(struct gendisk *disk, int partno) |
1da177e4 LT |
822 | { |
823 | int res = 0; | |
cf771cb5 | 824 | struct block_device *bdev = bdget_disk(disk, partno); |
1da177e4 | 825 | if (bdev) { |
2ef41634 CH |
826 | fsync_bdev(bdev); |
827 | res = __invalidate_device(bdev); | |
1da177e4 LT |
828 | bdput(bdev); |
829 | } | |
830 | return res; | |
831 | } | |
832 | ||
833 | EXPORT_SYMBOL(invalidate_partition); |