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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 |
68eef3b4 | 46 | void blkdev_show(struct seq_file *f, 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 JK |
52 | for (dp = major_names[offset]; dp; dp = dp->next) |
53 | seq_printf(f, "%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 | ||
edfaa7c3 | 160 | static struct kobject *exact_match(dev_t devt, int *part, 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 | { | |
185 | disk->flags |= GENHD_FL_UP; | |
186 | blk_register_region(MKDEV(disk->major, disk->first_minor), | |
187 | disk->minors, NULL, exact_match, exact_lock, disk); | |
188 | register_disk(disk); | |
189 | blk_register_queue(disk); | |
190 | } | |
191 | ||
192 | EXPORT_SYMBOL(add_disk); | |
193 | EXPORT_SYMBOL(del_gendisk); /* in partitions/check.c */ | |
194 | ||
195 | void unlink_gendisk(struct gendisk *disk) | |
196 | { | |
197 | blk_unregister_queue(disk); | |
198 | blk_unregister_region(MKDEV(disk->major, disk->first_minor), | |
199 | disk->minors); | |
200 | } | |
201 | ||
1da177e4 LT |
202 | /** |
203 | * get_gendisk - get partitioning information for a given device | |
204 | * @dev: device to get partitioning information for | |
205 | * | |
206 | * This function gets the structure containing partitioning | |
207 | * information for the given device @dev. | |
208 | */ | |
edfaa7c3 | 209 | struct gendisk *get_gendisk(dev_t devt, int *part) |
1da177e4 | 210 | { |
edfaa7c3 KS |
211 | struct kobject *kobj = kobj_lookup(bdev_map, devt, part); |
212 | struct device *dev = kobj_to_dev(kobj); | |
213 | ||
214 | return kobj ? dev_to_disk(dev) : NULL; | |
1da177e4 LT |
215 | } |
216 | ||
dd2a345f DG |
217 | /* |
218 | * print a full list of all partitions - intended for places where the root | |
219 | * filesystem can't be mounted and thus to give the victim some idea of what | |
220 | * went wrong | |
221 | */ | |
222 | void __init printk_all_partitions(void) | |
223 | { | |
edfaa7c3 | 224 | struct device *dev; |
dd2a345f | 225 | struct gendisk *sgp; |
edfaa7c3 KS |
226 | char buf[BDEVNAME_SIZE]; |
227 | int n; | |
dd2a345f | 228 | |
edfaa7c3 | 229 | mutex_lock(&block_class_lock); |
dd2a345f | 230 | /* For each block device... */ |
edfaa7c3 KS |
231 | list_for_each_entry(dev, &block_class.devices, node) { |
232 | if (dev->type != &disk_type) | |
233 | continue; | |
234 | sgp = dev_to_disk(dev); | |
dd2a345f DG |
235 | /* |
236 | * Don't show empty devices or things that have been surpressed | |
237 | */ | |
238 | if (get_capacity(sgp) == 0 || | |
239 | (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO)) | |
240 | continue; | |
241 | ||
242 | /* | |
243 | * Note, unlike /proc/partitions, I am showing the numbers in | |
244 | * hex - the same format as the root= option takes. | |
245 | */ | |
246 | printk("%02x%02x %10llu %s", | |
247 | sgp->major, sgp->first_minor, | |
248 | (unsigned long long)get_capacity(sgp) >> 1, | |
249 | disk_name(sgp, 0, buf)); | |
250 | if (sgp->driverfs_dev != NULL && | |
251 | sgp->driverfs_dev->driver != NULL) | |
252 | printk(" driver: %s\n", | |
253 | sgp->driverfs_dev->driver->name); | |
254 | else | |
255 | printk(" (driver?)\n"); | |
256 | ||
257 | /* now show the partitions */ | |
258 | for (n = 0; n < sgp->minors - 1; ++n) { | |
259 | if (sgp->part[n] == NULL) | |
260 | continue; | |
261 | if (sgp->part[n]->nr_sects == 0) | |
262 | continue; | |
263 | printk(" %02x%02x %10llu %s\n", | |
264 | sgp->major, n + 1 + sgp->first_minor, | |
265 | (unsigned long long)sgp->part[n]->nr_sects >> 1, | |
266 | disk_name(sgp, n + 1, buf)); | |
edfaa7c3 KS |
267 | } |
268 | } | |
dd2a345f | 269 | |
edfaa7c3 | 270 | mutex_unlock(&block_class_lock); |
dd2a345f DG |
271 | } |
272 | ||
1da177e4 LT |
273 | #ifdef CONFIG_PROC_FS |
274 | /* iterator */ | |
275 | static void *part_start(struct seq_file *part, loff_t *pos) | |
276 | { | |
edfaa7c3 KS |
277 | loff_t k = *pos; |
278 | struct device *dev; | |
1da177e4 | 279 | |
edfaa7c3 KS |
280 | mutex_lock(&block_class_lock); |
281 | list_for_each_entry(dev, &block_class.devices, node) { | |
282 | if (dev->type != &disk_type) | |
283 | continue; | |
284 | if (!k--) | |
285 | return dev_to_disk(dev); | |
286 | } | |
1da177e4 LT |
287 | return NULL; |
288 | } | |
289 | ||
290 | static void *part_next(struct seq_file *part, void *v, loff_t *pos) | |
291 | { | |
edfaa7c3 KS |
292 | struct gendisk *gp = v; |
293 | struct device *dev; | |
1da177e4 | 294 | ++*pos; |
edfaa7c3 KS |
295 | list_for_each_entry(dev, &gp->dev.node, node) { |
296 | if (&dev->node == &block_class.devices) | |
297 | return NULL; | |
298 | if (dev->type == &disk_type) | |
299 | return dev_to_disk(dev); | |
300 | } | |
301 | return NULL; | |
1da177e4 LT |
302 | } |
303 | ||
304 | static void part_stop(struct seq_file *part, void *v) | |
305 | { | |
edfaa7c3 | 306 | mutex_unlock(&block_class_lock); |
1da177e4 LT |
307 | } |
308 | ||
309 | static int show_partition(struct seq_file *part, void *v) | |
310 | { | |
311 | struct gendisk *sgp = v; | |
312 | int n; | |
313 | char buf[BDEVNAME_SIZE]; | |
314 | ||
edfaa7c3 | 315 | if (&sgp->dev.node == block_class.devices.next) |
1da177e4 LT |
316 | seq_puts(part, "major minor #blocks name\n\n"); |
317 | ||
318 | /* Don't show non-partitionable removeable devices or empty devices */ | |
319 | if (!get_capacity(sgp) || | |
320 | (sgp->minors == 1 && (sgp->flags & GENHD_FL_REMOVABLE))) | |
321 | return 0; | |
322 | if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO) | |
323 | return 0; | |
324 | ||
325 | /* show the full disk and all non-0 size partitions of it */ | |
326 | seq_printf(part, "%4d %4d %10llu %s\n", | |
327 | sgp->major, sgp->first_minor, | |
328 | (unsigned long long)get_capacity(sgp) >> 1, | |
329 | disk_name(sgp, 0, buf)); | |
330 | for (n = 0; n < sgp->minors - 1; n++) { | |
331 | if (!sgp->part[n]) | |
332 | continue; | |
333 | if (sgp->part[n]->nr_sects == 0) | |
334 | continue; | |
335 | seq_printf(part, "%4d %4d %10llu %s\n", | |
336 | sgp->major, n + 1 + sgp->first_minor, | |
337 | (unsigned long long)sgp->part[n]->nr_sects >> 1 , | |
338 | disk_name(sgp, n + 1, buf)); | |
339 | } | |
340 | ||
341 | return 0; | |
342 | } | |
343 | ||
12f32bb3 | 344 | const struct seq_operations partitions_op = { |
edfaa7c3 KS |
345 | .start = part_start, |
346 | .next = part_next, | |
347 | .stop = part_stop, | |
348 | .show = show_partition | |
1da177e4 LT |
349 | }; |
350 | #endif | |
351 | ||
352 | ||
edfaa7c3 | 353 | static struct kobject *base_probe(dev_t devt, int *part, void *data) |
1da177e4 | 354 | { |
edfaa7c3 | 355 | if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0) |
1da177e4 | 356 | /* Make old-style 2.4 aliases work */ |
edfaa7c3 | 357 | request_module("block-major-%d", MAJOR(devt)); |
1da177e4 LT |
358 | return NULL; |
359 | } | |
360 | ||
361 | static int __init genhd_device_init(void) | |
362 | { | |
edfaa7c3 KS |
363 | class_register(&block_class); |
364 | bdev_map = kobj_map_init(base_probe, &block_class_lock); | |
1da177e4 | 365 | blk_dev_init(); |
edfaa7c3 KS |
366 | |
367 | #ifndef CONFIG_SYSFS_DEPRECATED | |
368 | /* create top-level block dir */ | |
369 | block_depr = kobject_create_and_add("block", NULL); | |
370 | #endif | |
830d3cfb | 371 | return 0; |
1da177e4 LT |
372 | } |
373 | ||
374 | subsys_initcall(genhd_device_init); | |
375 | ||
edfaa7c3 KS |
376 | static ssize_t disk_range_show(struct device *dev, |
377 | struct device_attribute *attr, char *buf) | |
1da177e4 | 378 | { |
edfaa7c3 | 379 | struct gendisk *disk = dev_to_disk(dev); |
1da177e4 | 380 | |
edfaa7c3 | 381 | return sprintf(buf, "%d\n", disk->minors); |
1da177e4 LT |
382 | } |
383 | ||
edfaa7c3 KS |
384 | static ssize_t disk_removable_show(struct device *dev, |
385 | struct device_attribute *attr, char *buf) | |
a7fd6706 | 386 | { |
edfaa7c3 | 387 | struct gendisk *disk = dev_to_disk(dev); |
a7fd6706 | 388 | |
edfaa7c3 KS |
389 | return sprintf(buf, "%d\n", |
390 | (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); | |
a7fd6706 KS |
391 | } |
392 | ||
edfaa7c3 KS |
393 | static ssize_t disk_size_show(struct device *dev, |
394 | struct device_attribute *attr, char *buf) | |
a7fd6706 | 395 | { |
edfaa7c3 | 396 | struct gendisk *disk = dev_to_disk(dev); |
1da177e4 | 397 | |
edfaa7c3 | 398 | return sprintf(buf, "%llu\n", (unsigned long long)get_capacity(disk)); |
1da177e4 | 399 | } |
edfaa7c3 KS |
400 | |
401 | static ssize_t disk_capability_show(struct device *dev, | |
402 | struct device_attribute *attr, char *buf) | |
86ce18d7 | 403 | { |
edfaa7c3 KS |
404 | struct gendisk *disk = dev_to_disk(dev); |
405 | ||
406 | return sprintf(buf, "%x\n", disk->flags); | |
86ce18d7 | 407 | } |
edfaa7c3 KS |
408 | |
409 | static ssize_t disk_stat_show(struct device *dev, | |
410 | struct device_attribute *attr, char *buf) | |
1da177e4 | 411 | { |
edfaa7c3 KS |
412 | struct gendisk *disk = dev_to_disk(dev); |
413 | ||
1da177e4 LT |
414 | preempt_disable(); |
415 | disk_round_stats(disk); | |
416 | preempt_enable(); | |
edfaa7c3 | 417 | return sprintf(buf, |
837c7878 BW |
418 | "%8lu %8lu %8llu %8u " |
419 | "%8lu %8lu %8llu %8u " | |
1da177e4 LT |
420 | "%8u %8u %8u" |
421 | "\n", | |
47a00410 JA |
422 | disk_stat_read(disk, ios[READ]), |
423 | disk_stat_read(disk, merges[READ]), | |
424 | (unsigned long long)disk_stat_read(disk, sectors[READ]), | |
425 | jiffies_to_msecs(disk_stat_read(disk, ticks[READ])), | |
426 | disk_stat_read(disk, ios[WRITE]), | |
427 | disk_stat_read(disk, merges[WRITE]), | |
428 | (unsigned long long)disk_stat_read(disk, sectors[WRITE]), | |
429 | jiffies_to_msecs(disk_stat_read(disk, ticks[WRITE])), | |
1da177e4 LT |
430 | disk->in_flight, |
431 | jiffies_to_msecs(disk_stat_read(disk, io_ticks)), | |
432 | jiffies_to_msecs(disk_stat_read(disk, time_in_queue))); | |
433 | } | |
1da177e4 | 434 | |
c17bb495 | 435 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 KS |
436 | static ssize_t disk_fail_show(struct device *dev, |
437 | struct device_attribute *attr, char *buf) | |
438 | { | |
439 | struct gendisk *disk = dev_to_disk(dev); | |
440 | ||
441 | return sprintf(buf, "%d\n", disk->flags & GENHD_FL_FAIL ? 1 : 0); | |
442 | } | |
c17bb495 | 443 | |
edfaa7c3 KS |
444 | static ssize_t disk_fail_store(struct device *dev, |
445 | struct device_attribute *attr, | |
c17bb495 AM |
446 | const char *buf, size_t count) |
447 | { | |
edfaa7c3 | 448 | struct gendisk *disk = dev_to_disk(dev); |
c17bb495 AM |
449 | int i; |
450 | ||
451 | if (count > 0 && sscanf(buf, "%d", &i) > 0) { | |
452 | if (i == 0) | |
453 | disk->flags &= ~GENHD_FL_FAIL; | |
454 | else | |
455 | disk->flags |= GENHD_FL_FAIL; | |
456 | } | |
457 | ||
458 | return count; | |
459 | } | |
c17bb495 AM |
460 | |
461 | #endif | |
462 | ||
edfaa7c3 KS |
463 | static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL); |
464 | static DEVICE_ATTR(removable, S_IRUGO, disk_removable_show, NULL); | |
465 | static DEVICE_ATTR(size, S_IRUGO, disk_size_show, NULL); | |
466 | static DEVICE_ATTR(capability, S_IRUGO, disk_capability_show, NULL); | |
467 | static DEVICE_ATTR(stat, S_IRUGO, disk_stat_show, NULL); | |
c17bb495 | 468 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 KS |
469 | static struct device_attribute dev_attr_fail = |
470 | __ATTR(make-it-fail, S_IRUGO|S_IWUSR, disk_fail_show, disk_fail_store); | |
c17bb495 | 471 | #endif |
edfaa7c3 KS |
472 | |
473 | static struct attribute *disk_attrs[] = { | |
474 | &dev_attr_range.attr, | |
475 | &dev_attr_removable.attr, | |
476 | &dev_attr_size.attr, | |
477 | &dev_attr_capability.attr, | |
478 | &dev_attr_stat.attr, | |
479 | #ifdef CONFIG_FAIL_MAKE_REQUEST | |
480 | &dev_attr_fail.attr, | |
481 | #endif | |
482 | NULL | |
483 | }; | |
484 | ||
485 | static struct attribute_group disk_attr_group = { | |
486 | .attrs = disk_attrs, | |
487 | }; | |
488 | ||
489 | static struct attribute_group *disk_attr_groups[] = { | |
490 | &disk_attr_group, | |
491 | NULL | |
1da177e4 LT |
492 | }; |
493 | ||
edfaa7c3 | 494 | static void disk_release(struct device *dev) |
1da177e4 | 495 | { |
edfaa7c3 KS |
496 | struct gendisk *disk = dev_to_disk(dev); |
497 | ||
1da177e4 LT |
498 | kfree(disk->random); |
499 | kfree(disk->part); | |
500 | free_disk_stats(disk); | |
501 | kfree(disk); | |
502 | } | |
edfaa7c3 KS |
503 | struct class block_class = { |
504 | .name = "block", | |
1da177e4 LT |
505 | }; |
506 | ||
1826eadf | 507 | static struct device_type disk_type = { |
edfaa7c3 KS |
508 | .name = "disk", |
509 | .groups = disk_attr_groups, | |
510 | .release = disk_release, | |
1da177e4 LT |
511 | }; |
512 | ||
1da177e4 LT |
513 | /* |
514 | * aggregate disk stat collector. Uses the same stats that the sysfs | |
515 | * entries do, above, but makes them available through one seq_file. | |
1da177e4 LT |
516 | * |
517 | * The output looks suspiciously like /proc/partitions with a bunch of | |
518 | * extra fields. | |
519 | */ | |
520 | ||
1da177e4 LT |
521 | static void *diskstats_start(struct seq_file *part, loff_t *pos) |
522 | { | |
523 | loff_t k = *pos; | |
edfaa7c3 | 524 | struct device *dev; |
1da177e4 | 525 | |
edfaa7c3 KS |
526 | mutex_lock(&block_class_lock); |
527 | list_for_each_entry(dev, &block_class.devices, node) { | |
528 | if (dev->type != &disk_type) | |
529 | continue; | |
1da177e4 | 530 | if (!k--) |
edfaa7c3 KS |
531 | return dev_to_disk(dev); |
532 | } | |
1da177e4 LT |
533 | return NULL; |
534 | } | |
535 | ||
536 | static void *diskstats_next(struct seq_file *part, void *v, loff_t *pos) | |
537 | { | |
edfaa7c3 KS |
538 | struct gendisk *gp = v; |
539 | struct device *dev; | |
540 | ||
1da177e4 | 541 | ++*pos; |
edfaa7c3 KS |
542 | list_for_each_entry(dev, &gp->dev.node, node) { |
543 | if (&dev->node == &block_class.devices) | |
544 | return NULL; | |
545 | if (dev->type == &disk_type) | |
546 | return dev_to_disk(dev); | |
547 | } | |
548 | return NULL; | |
1da177e4 LT |
549 | } |
550 | ||
551 | static void diskstats_stop(struct seq_file *part, void *v) | |
552 | { | |
edfaa7c3 | 553 | mutex_unlock(&block_class_lock); |
1da177e4 LT |
554 | } |
555 | ||
556 | static int diskstats_show(struct seq_file *s, void *v) | |
557 | { | |
558 | struct gendisk *gp = v; | |
559 | char buf[BDEVNAME_SIZE]; | |
560 | int n = 0; | |
561 | ||
562 | /* | |
edfaa7c3 | 563 | if (&gp->dev.kobj.entry == block_class.devices.next) |
1da177e4 LT |
564 | seq_puts(s, "major minor name" |
565 | " rio rmerge rsect ruse wio wmerge " | |
566 | "wsect wuse running use aveq" | |
567 | "\n\n"); | |
568 | */ | |
569 | ||
570 | preempt_disable(); | |
571 | disk_round_stats(gp); | |
572 | preempt_enable(); | |
837c7878 | 573 | seq_printf(s, "%4d %4d %s %lu %lu %llu %u %lu %lu %llu %u %u %u %u\n", |
1da177e4 | 574 | gp->major, n + gp->first_minor, disk_name(gp, n, buf), |
a362357b JA |
575 | disk_stat_read(gp, ios[0]), disk_stat_read(gp, merges[0]), |
576 | (unsigned long long)disk_stat_read(gp, sectors[0]), | |
577 | jiffies_to_msecs(disk_stat_read(gp, ticks[0])), | |
578 | disk_stat_read(gp, ios[1]), disk_stat_read(gp, merges[1]), | |
579 | (unsigned long long)disk_stat_read(gp, sectors[1]), | |
580 | jiffies_to_msecs(disk_stat_read(gp, ticks[1])), | |
1da177e4 LT |
581 | gp->in_flight, |
582 | jiffies_to_msecs(disk_stat_read(gp, io_ticks)), | |
583 | jiffies_to_msecs(disk_stat_read(gp, time_in_queue))); | |
584 | ||
585 | /* now show all non-0 size partitions of it */ | |
586 | for (n = 0; n < gp->minors - 1; n++) { | |
587 | struct hd_struct *hd = gp->part[n]; | |
588 | ||
28f39d55 JM |
589 | if (!hd || !hd->nr_sects) |
590 | continue; | |
591 | ||
592 | preempt_disable(); | |
593 | part_round_stats(hd); | |
594 | preempt_enable(); | |
595 | seq_printf(s, "%4d %4d %s %lu %lu %llu " | |
596 | "%u %lu %lu %llu %u %u %u %u\n", | |
597 | gp->major, n + gp->first_minor + 1, | |
598 | disk_name(gp, n + 1, buf), | |
599 | part_stat_read(hd, ios[0]), | |
600 | part_stat_read(hd, merges[0]), | |
601 | (unsigned long long)part_stat_read(hd, sectors[0]), | |
602 | jiffies_to_msecs(part_stat_read(hd, ticks[0])), | |
603 | part_stat_read(hd, ios[1]), | |
604 | part_stat_read(hd, merges[1]), | |
605 | (unsigned long long)part_stat_read(hd, sectors[1]), | |
606 | jiffies_to_msecs(part_stat_read(hd, ticks[1])), | |
607 | hd->in_flight, | |
608 | jiffies_to_msecs(part_stat_read(hd, io_ticks)), | |
609 | jiffies_to_msecs(part_stat_read(hd, time_in_queue)) | |
610 | ); | |
1da177e4 LT |
611 | } |
612 | ||
613 | return 0; | |
614 | } | |
615 | ||
12f32bb3 | 616 | const struct seq_operations diskstats_op = { |
1da177e4 LT |
617 | .start = diskstats_start, |
618 | .next = diskstats_next, | |
619 | .stop = diskstats_stop, | |
620 | .show = diskstats_show | |
621 | }; | |
622 | ||
8ce7ad7b KCA |
623 | static void media_change_notify_thread(struct work_struct *work) |
624 | { | |
625 | struct gendisk *gd = container_of(work, struct gendisk, async_notify); | |
626 | char event[] = "MEDIA_CHANGE=1"; | |
627 | char *envp[] = { event, NULL }; | |
628 | ||
629 | /* | |
630 | * set enviroment vars to indicate which event this is for | |
631 | * so that user space will know to go check the media status. | |
632 | */ | |
edfaa7c3 | 633 | kobject_uevent_env(&gd->dev.kobj, KOBJ_CHANGE, envp); |
8ce7ad7b KCA |
634 | put_device(gd->driverfs_dev); |
635 | } | |
636 | ||
1826eadf | 637 | #if 0 |
8ce7ad7b KCA |
638 | void genhd_media_change_notify(struct gendisk *disk) |
639 | { | |
640 | get_device(disk->driverfs_dev); | |
641 | schedule_work(&disk->async_notify); | |
642 | } | |
643 | EXPORT_SYMBOL_GPL(genhd_media_change_notify); | |
1826eadf | 644 | #endif /* 0 */ |
8ce7ad7b | 645 | |
edfaa7c3 KS |
646 | dev_t blk_lookup_devt(const char *name) |
647 | { | |
648 | struct device *dev; | |
649 | dev_t devt = MKDEV(0, 0); | |
650 | ||
651 | mutex_lock(&block_class_lock); | |
652 | list_for_each_entry(dev, &block_class.devices, node) { | |
653 | if (strcmp(dev->bus_id, name) == 0) { | |
654 | devt = dev->devt; | |
655 | break; | |
656 | } | |
657 | } | |
658 | mutex_unlock(&block_class_lock); | |
659 | ||
660 | return devt; | |
661 | } | |
662 | ||
663 | EXPORT_SYMBOL(blk_lookup_devt); | |
664 | ||
1da177e4 LT |
665 | struct gendisk *alloc_disk(int minors) |
666 | { | |
1946089a CL |
667 | return alloc_disk_node(minors, -1); |
668 | } | |
669 | ||
670 | struct gendisk *alloc_disk_node(int minors, int node_id) | |
671 | { | |
672 | struct gendisk *disk; | |
673 | ||
94f6030c CL |
674 | disk = kmalloc_node(sizeof(struct gendisk), |
675 | GFP_KERNEL | __GFP_ZERO, node_id); | |
1da177e4 | 676 | if (disk) { |
1da177e4 LT |
677 | if (!init_disk_stats(disk)) { |
678 | kfree(disk); | |
679 | return NULL; | |
680 | } | |
681 | if (minors > 1) { | |
682 | int size = (minors - 1) * sizeof(struct hd_struct *); | |
94f6030c CL |
683 | disk->part = kmalloc_node(size, |
684 | GFP_KERNEL | __GFP_ZERO, node_id); | |
1da177e4 | 685 | if (!disk->part) { |
c7674030 | 686 | free_disk_stats(disk); |
1da177e4 LT |
687 | kfree(disk); |
688 | return NULL; | |
689 | } | |
1da177e4 LT |
690 | } |
691 | disk->minors = minors; | |
1da177e4 | 692 | rand_initialize_disk(disk); |
edfaa7c3 KS |
693 | disk->dev.class = &block_class; |
694 | disk->dev.type = &disk_type; | |
695 | device_initialize(&disk->dev); | |
8ce7ad7b KCA |
696 | INIT_WORK(&disk->async_notify, |
697 | media_change_notify_thread); | |
1da177e4 LT |
698 | } |
699 | return disk; | |
700 | } | |
701 | ||
702 | EXPORT_SYMBOL(alloc_disk); | |
1946089a | 703 | EXPORT_SYMBOL(alloc_disk_node); |
1da177e4 LT |
704 | |
705 | struct kobject *get_disk(struct gendisk *disk) | |
706 | { | |
707 | struct module *owner; | |
708 | struct kobject *kobj; | |
709 | ||
710 | if (!disk->fops) | |
711 | return NULL; | |
712 | owner = disk->fops->owner; | |
713 | if (owner && !try_module_get(owner)) | |
714 | return NULL; | |
edfaa7c3 | 715 | kobj = kobject_get(&disk->dev.kobj); |
1da177e4 LT |
716 | if (kobj == NULL) { |
717 | module_put(owner); | |
718 | return NULL; | |
719 | } | |
720 | return kobj; | |
721 | ||
722 | } | |
723 | ||
724 | EXPORT_SYMBOL(get_disk); | |
725 | ||
726 | void put_disk(struct gendisk *disk) | |
727 | { | |
728 | if (disk) | |
edfaa7c3 | 729 | kobject_put(&disk->dev.kobj); |
1da177e4 LT |
730 | } |
731 | ||
732 | EXPORT_SYMBOL(put_disk); | |
733 | ||
734 | void set_device_ro(struct block_device *bdev, int flag) | |
735 | { | |
736 | if (bdev->bd_contains != bdev) | |
737 | bdev->bd_part->policy = flag; | |
738 | else | |
739 | bdev->bd_disk->policy = flag; | |
740 | } | |
741 | ||
742 | EXPORT_SYMBOL(set_device_ro); | |
743 | ||
744 | void set_disk_ro(struct gendisk *disk, int flag) | |
745 | { | |
746 | int i; | |
747 | disk->policy = flag; | |
748 | for (i = 0; i < disk->minors - 1; i++) | |
749 | if (disk->part[i]) disk->part[i]->policy = flag; | |
750 | } | |
751 | ||
752 | EXPORT_SYMBOL(set_disk_ro); | |
753 | ||
754 | int bdev_read_only(struct block_device *bdev) | |
755 | { | |
756 | if (!bdev) | |
757 | return 0; | |
758 | else if (bdev->bd_contains != bdev) | |
759 | return bdev->bd_part->policy; | |
760 | else | |
761 | return bdev->bd_disk->policy; | |
762 | } | |
763 | ||
764 | EXPORT_SYMBOL(bdev_read_only); | |
765 | ||
766 | int invalidate_partition(struct gendisk *disk, int index) | |
767 | { | |
768 | int res = 0; | |
769 | struct block_device *bdev = bdget_disk(disk, index); | |
770 | if (bdev) { | |
2ef41634 CH |
771 | fsync_bdev(bdev); |
772 | res = __invalidate_device(bdev); | |
1da177e4 LT |
773 | bdput(bdev); |
774 | } | |
775 | return res; | |
776 | } | |
777 | ||
778 | EXPORT_SYMBOL(invalidate_partition); |