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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> | |
8 | #include <linux/kernel.h> | |
9 | #include <linux/blkdev.h> | |
10 | #include <linux/init.h> | |
11 | #include <linux/spinlock.h> | |
12 | #include <linux/seq_file.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/kmod.h> | |
15 | #include <linux/kobj_map.h> | |
2ef41634 | 16 | #include <linux/buffer_head.h> |
58383af6 | 17 | #include <linux/mutex.h> |
1da177e4 | 18 | |
b9d9c82b | 19 | struct subsystem block_subsys; |
58383af6 | 20 | static DEFINE_MUTEX(block_subsys_lock); |
1da177e4 LT |
21 | |
22 | /* | |
23 | * Can be deleted altogether. Later. | |
24 | * | |
25 | */ | |
26 | static struct blk_major_name { | |
27 | struct blk_major_name *next; | |
28 | int major; | |
29 | char name[16]; | |
68eef3b4 | 30 | } *major_names[BLKDEV_MAJOR_HASH_SIZE]; |
1da177e4 LT |
31 | |
32 | /* index in the above - for now: assume no multimajor ranges */ | |
33 | static inline int major_to_index(int major) | |
34 | { | |
68eef3b4 | 35 | return major % BLKDEV_MAJOR_HASH_SIZE; |
7170be5f NH |
36 | } |
37 | ||
68eef3b4 | 38 | #ifdef CONFIG_PROC_FS |
7170be5f | 39 | |
68eef3b4 | 40 | void blkdev_show(struct seq_file *f, off_t offset) |
7170be5f | 41 | { |
68eef3b4 | 42 | struct blk_major_name *dp; |
7170be5f | 43 | |
68eef3b4 JK |
44 | if (offset < BLKDEV_MAJOR_HASH_SIZE) { |
45 | mutex_lock(&block_subsys_lock); | |
46 | for (dp = major_names[offset]; dp; dp = dp->next) | |
47 | seq_printf(f, "%3d %s\n", dp->major, dp->name); | |
48 | mutex_unlock(&block_subsys_lock); | |
1da177e4 | 49 | } |
1da177e4 | 50 | } |
7170be5f | 51 | |
68eef3b4 | 52 | #endif /* CONFIG_PROC_FS */ |
1da177e4 LT |
53 | |
54 | int register_blkdev(unsigned int major, const char *name) | |
55 | { | |
56 | struct blk_major_name **n, *p; | |
57 | int index, ret = 0; | |
58 | ||
58383af6 | 59 | mutex_lock(&block_subsys_lock); |
1da177e4 LT |
60 | |
61 | /* temporary */ | |
62 | if (major == 0) { | |
63 | for (index = ARRAY_SIZE(major_names)-1; index > 0; index--) { | |
64 | if (major_names[index] == NULL) | |
65 | break; | |
66 | } | |
67 | ||
68 | if (index == 0) { | |
69 | printk("register_blkdev: failed to get major for %s\n", | |
70 | name); | |
71 | ret = -EBUSY; | |
72 | goto out; | |
73 | } | |
74 | major = index; | |
75 | ret = major; | |
76 | } | |
77 | ||
78 | p = kmalloc(sizeof(struct blk_major_name), GFP_KERNEL); | |
79 | if (p == NULL) { | |
80 | ret = -ENOMEM; | |
81 | goto out; | |
82 | } | |
83 | ||
84 | p->major = major; | |
85 | strlcpy(p->name, name, sizeof(p->name)); | |
86 | p->next = NULL; | |
87 | index = major_to_index(major); | |
88 | ||
89 | for (n = &major_names[index]; *n; n = &(*n)->next) { | |
90 | if ((*n)->major == major) | |
91 | break; | |
92 | } | |
93 | if (!*n) | |
94 | *n = p; | |
95 | else | |
96 | ret = -EBUSY; | |
97 | ||
98 | if (ret < 0) { | |
99 | printk("register_blkdev: cannot get major %d for %s\n", | |
100 | major, name); | |
101 | kfree(p); | |
102 | } | |
103 | out: | |
58383af6 | 104 | mutex_unlock(&block_subsys_lock); |
1da177e4 LT |
105 | return ret; |
106 | } | |
107 | ||
108 | EXPORT_SYMBOL(register_blkdev); | |
109 | ||
110 | /* todo: make void - error printk here */ | |
111 | int unregister_blkdev(unsigned int major, const char *name) | |
112 | { | |
113 | struct blk_major_name **n; | |
114 | struct blk_major_name *p = NULL; | |
115 | int index = major_to_index(major); | |
116 | int ret = 0; | |
117 | ||
58383af6 | 118 | mutex_lock(&block_subsys_lock); |
1da177e4 LT |
119 | for (n = &major_names[index]; *n; n = &(*n)->next) |
120 | if ((*n)->major == major) | |
121 | break; | |
122 | if (!*n || strcmp((*n)->name, name)) | |
123 | ret = -EINVAL; | |
124 | else { | |
125 | p = *n; | |
126 | *n = p->next; | |
127 | } | |
58383af6 | 128 | mutex_unlock(&block_subsys_lock); |
1da177e4 LT |
129 | kfree(p); |
130 | ||
131 | return ret; | |
132 | } | |
133 | ||
134 | EXPORT_SYMBOL(unregister_blkdev); | |
135 | ||
136 | static struct kobj_map *bdev_map; | |
137 | ||
138 | /* | |
139 | * Register device numbers dev..(dev+range-1) | |
140 | * range must be nonzero | |
141 | * The hash chain is sorted on range, so that subranges can override. | |
142 | */ | |
143 | void blk_register_region(dev_t dev, unsigned long range, struct module *module, | |
144 | struct kobject *(*probe)(dev_t, int *, void *), | |
145 | int (*lock)(dev_t, void *), void *data) | |
146 | { | |
147 | kobj_map(bdev_map, dev, range, module, probe, lock, data); | |
148 | } | |
149 | ||
150 | EXPORT_SYMBOL(blk_register_region); | |
151 | ||
152 | void blk_unregister_region(dev_t dev, unsigned long range) | |
153 | { | |
154 | kobj_unmap(bdev_map, dev, range); | |
155 | } | |
156 | ||
157 | EXPORT_SYMBOL(blk_unregister_region); | |
158 | ||
159 | static struct kobject *exact_match(dev_t dev, int *part, void *data) | |
160 | { | |
161 | struct gendisk *p = data; | |
162 | return &p->kobj; | |
163 | } | |
164 | ||
165 | static int exact_lock(dev_t dev, void *data) | |
166 | { | |
167 | struct gendisk *p = data; | |
168 | ||
169 | if (!get_disk(p)) | |
170 | return -1; | |
171 | return 0; | |
172 | } | |
173 | ||
174 | /** | |
175 | * add_disk - add partitioning information to kernel list | |
176 | * @disk: per-device partitioning information | |
177 | * | |
178 | * This function registers the partitioning information in @disk | |
179 | * with the kernel. | |
180 | */ | |
181 | void add_disk(struct gendisk *disk) | |
182 | { | |
183 | disk->flags |= GENHD_FL_UP; | |
184 | blk_register_region(MKDEV(disk->major, disk->first_minor), | |
185 | disk->minors, NULL, exact_match, exact_lock, disk); | |
186 | register_disk(disk); | |
187 | blk_register_queue(disk); | |
188 | } | |
189 | ||
190 | EXPORT_SYMBOL(add_disk); | |
191 | EXPORT_SYMBOL(del_gendisk); /* in partitions/check.c */ | |
192 | ||
193 | void unlink_gendisk(struct gendisk *disk) | |
194 | { | |
195 | blk_unregister_queue(disk); | |
196 | blk_unregister_region(MKDEV(disk->major, disk->first_minor), | |
197 | disk->minors); | |
198 | } | |
199 | ||
200 | #define to_disk(obj) container_of(obj,struct gendisk,kobj) | |
201 | ||
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 | */ | |
209 | struct gendisk *get_gendisk(dev_t dev, int *part) | |
210 | { | |
211 | struct kobject *kobj = kobj_lookup(bdev_map, dev, part); | |
212 | return kobj ? to_disk(kobj) : NULL; | |
213 | } | |
214 | ||
215 | #ifdef CONFIG_PROC_FS | |
216 | /* iterator */ | |
217 | static void *part_start(struct seq_file *part, loff_t *pos) | |
218 | { | |
219 | struct list_head *p; | |
220 | loff_t l = *pos; | |
221 | ||
58383af6 | 222 | mutex_lock(&block_subsys_lock); |
1da177e4 LT |
223 | list_for_each(p, &block_subsys.kset.list) |
224 | if (!l--) | |
225 | return list_entry(p, struct gendisk, kobj.entry); | |
226 | return NULL; | |
227 | } | |
228 | ||
229 | static void *part_next(struct seq_file *part, void *v, loff_t *pos) | |
230 | { | |
231 | struct list_head *p = ((struct gendisk *)v)->kobj.entry.next; | |
232 | ++*pos; | |
233 | return p==&block_subsys.kset.list ? NULL : | |
234 | list_entry(p, struct gendisk, kobj.entry); | |
235 | } | |
236 | ||
237 | static void part_stop(struct seq_file *part, void *v) | |
238 | { | |
58383af6 | 239 | mutex_unlock(&block_subsys_lock); |
1da177e4 LT |
240 | } |
241 | ||
242 | static int show_partition(struct seq_file *part, void *v) | |
243 | { | |
244 | struct gendisk *sgp = v; | |
245 | int n; | |
246 | char buf[BDEVNAME_SIZE]; | |
247 | ||
248 | if (&sgp->kobj.entry == block_subsys.kset.list.next) | |
249 | seq_puts(part, "major minor #blocks name\n\n"); | |
250 | ||
251 | /* Don't show non-partitionable removeable devices or empty devices */ | |
252 | if (!get_capacity(sgp) || | |
253 | (sgp->minors == 1 && (sgp->flags & GENHD_FL_REMOVABLE))) | |
254 | return 0; | |
255 | if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO) | |
256 | return 0; | |
257 | ||
258 | /* show the full disk and all non-0 size partitions of it */ | |
259 | seq_printf(part, "%4d %4d %10llu %s\n", | |
260 | sgp->major, sgp->first_minor, | |
261 | (unsigned long long)get_capacity(sgp) >> 1, | |
262 | disk_name(sgp, 0, buf)); | |
263 | for (n = 0; n < sgp->minors - 1; n++) { | |
264 | if (!sgp->part[n]) | |
265 | continue; | |
266 | if (sgp->part[n]->nr_sects == 0) | |
267 | continue; | |
268 | seq_printf(part, "%4d %4d %10llu %s\n", | |
269 | sgp->major, n + 1 + sgp->first_minor, | |
270 | (unsigned long long)sgp->part[n]->nr_sects >> 1 , | |
271 | disk_name(sgp, n + 1, buf)); | |
272 | } | |
273 | ||
274 | return 0; | |
275 | } | |
276 | ||
277 | struct seq_operations partitions_op = { | |
278 | .start =part_start, | |
279 | .next = part_next, | |
280 | .stop = part_stop, | |
281 | .show = show_partition | |
282 | }; | |
283 | #endif | |
284 | ||
285 | ||
286 | extern int blk_dev_init(void); | |
287 | ||
288 | static struct kobject *base_probe(dev_t dev, int *part, void *data) | |
289 | { | |
290 | if (request_module("block-major-%d-%d", MAJOR(dev), MINOR(dev)) > 0) | |
291 | /* Make old-style 2.4 aliases work */ | |
292 | request_module("block-major-%d", MAJOR(dev)); | |
293 | return NULL; | |
294 | } | |
295 | ||
296 | static int __init genhd_device_init(void) | |
297 | { | |
58383af6 | 298 | bdev_map = kobj_map_init(base_probe, &block_subsys_lock); |
1da177e4 LT |
299 | blk_dev_init(); |
300 | subsystem_register(&block_subsys); | |
301 | return 0; | |
302 | } | |
303 | ||
304 | subsys_initcall(genhd_device_init); | |
305 | ||
306 | ||
307 | ||
308 | /* | |
309 | * kobject & sysfs bindings for block devices | |
310 | */ | |
311 | static ssize_t disk_attr_show(struct kobject *kobj, struct attribute *attr, | |
312 | char *page) | |
313 | { | |
314 | struct gendisk *disk = to_disk(kobj); | |
315 | struct disk_attribute *disk_attr = | |
316 | container_of(attr,struct disk_attribute,attr); | |
6c1852a0 | 317 | ssize_t ret = -EIO; |
1da177e4 LT |
318 | |
319 | if (disk_attr->show) | |
320 | ret = disk_attr->show(disk,page); | |
321 | return ret; | |
322 | } | |
323 | ||
a7fd6706 KS |
324 | static ssize_t disk_attr_store(struct kobject * kobj, struct attribute * attr, |
325 | const char *page, size_t count) | |
326 | { | |
327 | struct gendisk *disk = to_disk(kobj); | |
328 | struct disk_attribute *disk_attr = | |
329 | container_of(attr,struct disk_attribute,attr); | |
330 | ssize_t ret = 0; | |
331 | ||
332 | if (disk_attr->store) | |
333 | ret = disk_attr->store(disk, page, count); | |
334 | return ret; | |
335 | } | |
336 | ||
1da177e4 LT |
337 | static struct sysfs_ops disk_sysfs_ops = { |
338 | .show = &disk_attr_show, | |
a7fd6706 | 339 | .store = &disk_attr_store, |
1da177e4 LT |
340 | }; |
341 | ||
a7fd6706 KS |
342 | static ssize_t disk_uevent_store(struct gendisk * disk, |
343 | const char *buf, size_t count) | |
344 | { | |
312c004d | 345 | kobject_uevent(&disk->kobj, KOBJ_ADD); |
a7fd6706 KS |
346 | return count; |
347 | } | |
1da177e4 LT |
348 | static ssize_t disk_dev_read(struct gendisk * disk, char *page) |
349 | { | |
350 | dev_t base = MKDEV(disk->major, disk->first_minor); | |
351 | return print_dev_t(page, base); | |
352 | } | |
353 | static ssize_t disk_range_read(struct gendisk * disk, char *page) | |
354 | { | |
355 | return sprintf(page, "%d\n", disk->minors); | |
356 | } | |
357 | static ssize_t disk_removable_read(struct gendisk * disk, char *page) | |
358 | { | |
359 | return sprintf(page, "%d\n", | |
360 | (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); | |
361 | ||
362 | } | |
363 | static ssize_t disk_size_read(struct gendisk * disk, char *page) | |
364 | { | |
365 | return sprintf(page, "%llu\n", (unsigned long long)get_capacity(disk)); | |
366 | } | |
367 | ||
368 | static ssize_t disk_stats_read(struct gendisk * disk, char *page) | |
369 | { | |
370 | preempt_disable(); | |
371 | disk_round_stats(disk); | |
372 | preempt_enable(); | |
373 | return sprintf(page, | |
837c7878 BW |
374 | "%8lu %8lu %8llu %8u " |
375 | "%8lu %8lu %8llu %8u " | |
1da177e4 LT |
376 | "%8u %8u %8u" |
377 | "\n", | |
47a00410 JA |
378 | disk_stat_read(disk, ios[READ]), |
379 | disk_stat_read(disk, merges[READ]), | |
380 | (unsigned long long)disk_stat_read(disk, sectors[READ]), | |
381 | jiffies_to_msecs(disk_stat_read(disk, ticks[READ])), | |
382 | disk_stat_read(disk, ios[WRITE]), | |
383 | disk_stat_read(disk, merges[WRITE]), | |
384 | (unsigned long long)disk_stat_read(disk, sectors[WRITE]), | |
385 | jiffies_to_msecs(disk_stat_read(disk, ticks[WRITE])), | |
1da177e4 LT |
386 | disk->in_flight, |
387 | jiffies_to_msecs(disk_stat_read(disk, io_ticks)), | |
388 | jiffies_to_msecs(disk_stat_read(disk, time_in_queue))); | |
389 | } | |
a7fd6706 KS |
390 | static struct disk_attribute disk_attr_uevent = { |
391 | .attr = {.name = "uevent", .mode = S_IWUSR }, | |
392 | .store = disk_uevent_store | |
393 | }; | |
1da177e4 LT |
394 | static struct disk_attribute disk_attr_dev = { |
395 | .attr = {.name = "dev", .mode = S_IRUGO }, | |
396 | .show = disk_dev_read | |
397 | }; | |
398 | static struct disk_attribute disk_attr_range = { | |
399 | .attr = {.name = "range", .mode = S_IRUGO }, | |
400 | .show = disk_range_read | |
401 | }; | |
402 | static struct disk_attribute disk_attr_removable = { | |
403 | .attr = {.name = "removable", .mode = S_IRUGO }, | |
404 | .show = disk_removable_read | |
405 | }; | |
406 | static struct disk_attribute disk_attr_size = { | |
407 | .attr = {.name = "size", .mode = S_IRUGO }, | |
408 | .show = disk_size_read | |
409 | }; | |
410 | static struct disk_attribute disk_attr_stat = { | |
411 | .attr = {.name = "stat", .mode = S_IRUGO }, | |
412 | .show = disk_stats_read | |
413 | }; | |
414 | ||
415 | static struct attribute * default_attrs[] = { | |
a7fd6706 | 416 | &disk_attr_uevent.attr, |
1da177e4 LT |
417 | &disk_attr_dev.attr, |
418 | &disk_attr_range.attr, | |
419 | &disk_attr_removable.attr, | |
420 | &disk_attr_size.attr, | |
421 | &disk_attr_stat.attr, | |
422 | NULL, | |
423 | }; | |
424 | ||
425 | static void disk_release(struct kobject * kobj) | |
426 | { | |
427 | struct gendisk *disk = to_disk(kobj); | |
428 | kfree(disk->random); | |
429 | kfree(disk->part); | |
430 | free_disk_stats(disk); | |
431 | kfree(disk); | |
432 | } | |
433 | ||
434 | static struct kobj_type ktype_block = { | |
435 | .release = disk_release, | |
436 | .sysfs_ops = &disk_sysfs_ops, | |
437 | .default_attrs = default_attrs, | |
438 | }; | |
439 | ||
440 | extern struct kobj_type ktype_part; | |
441 | ||
312c004d | 442 | static int block_uevent_filter(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
443 | { |
444 | struct kobj_type *ktype = get_ktype(kobj); | |
445 | ||
446 | return ((ktype == &ktype_block) || (ktype == &ktype_part)); | |
447 | } | |
448 | ||
312c004d | 449 | static int block_uevent(struct kset *kset, struct kobject *kobj, char **envp, |
1da177e4 LT |
450 | int num_envp, char *buffer, int buffer_size) |
451 | { | |
452 | struct kobj_type *ktype = get_ktype(kobj); | |
453 | struct device *physdev; | |
454 | struct gendisk *disk; | |
455 | struct hd_struct *part; | |
456 | int length = 0; | |
457 | int i = 0; | |
458 | ||
459 | if (ktype == &ktype_block) { | |
460 | disk = container_of(kobj, struct gendisk, kobj); | |
312c004d KS |
461 | add_uevent_var(envp, num_envp, &i, buffer, buffer_size, |
462 | &length, "MINOR=%u", disk->first_minor); | |
1da177e4 LT |
463 | } else if (ktype == &ktype_part) { |
464 | disk = container_of(kobj->parent, struct gendisk, kobj); | |
465 | part = container_of(kobj, struct hd_struct, kobj); | |
312c004d KS |
466 | add_uevent_var(envp, num_envp, &i, buffer, buffer_size, |
467 | &length, "MINOR=%u", | |
468 | disk->first_minor + part->partno); | |
1da177e4 LT |
469 | } else |
470 | return 0; | |
471 | ||
312c004d KS |
472 | add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length, |
473 | "MAJOR=%u", disk->major); | |
1da177e4 LT |
474 | |
475 | /* add physical device, backing this device */ | |
476 | physdev = disk->driverfs_dev; | |
477 | if (physdev) { | |
478 | char *path = kobject_get_path(&physdev->kobj, GFP_KERNEL); | |
479 | ||
312c004d KS |
480 | add_uevent_var(envp, num_envp, &i, buffer, buffer_size, |
481 | &length, "PHYSDEVPATH=%s", path); | |
1da177e4 LT |
482 | kfree(path); |
483 | ||
484 | if (physdev->bus) | |
312c004d KS |
485 | add_uevent_var(envp, num_envp, &i, |
486 | buffer, buffer_size, &length, | |
487 | "PHYSDEVBUS=%s", | |
488 | physdev->bus->name); | |
1da177e4 LT |
489 | |
490 | if (physdev->driver) | |
312c004d KS |
491 | add_uevent_var(envp, num_envp, &i, |
492 | buffer, buffer_size, &length, | |
493 | "PHYSDEVDRIVER=%s", | |
494 | physdev->driver->name); | |
1da177e4 LT |
495 | } |
496 | ||
497 | /* terminate, set to next free slot, shrink available space */ | |
498 | envp[i] = NULL; | |
499 | envp = &envp[i]; | |
500 | num_envp -= i; | |
501 | buffer = &buffer[length]; | |
502 | buffer_size -= length; | |
503 | ||
504 | return 0; | |
505 | } | |
506 | ||
312c004d KS |
507 | static struct kset_uevent_ops block_uevent_ops = { |
508 | .filter = block_uevent_filter, | |
509 | .uevent = block_uevent, | |
1da177e4 LT |
510 | }; |
511 | ||
b9d9c82b | 512 | decl_subsys(block, &ktype_block, &block_uevent_ops); |
1da177e4 LT |
513 | |
514 | /* | |
515 | * aggregate disk stat collector. Uses the same stats that the sysfs | |
516 | * entries do, above, but makes them available through one seq_file. | |
517 | * Watching a few disks may be efficient through sysfs, but watching | |
518 | * all of them will be more efficient through this interface. | |
519 | * | |
520 | * The output looks suspiciously like /proc/partitions with a bunch of | |
521 | * extra fields. | |
522 | */ | |
523 | ||
524 | /* iterator */ | |
525 | static void *diskstats_start(struct seq_file *part, loff_t *pos) | |
526 | { | |
527 | loff_t k = *pos; | |
528 | struct list_head *p; | |
529 | ||
58383af6 | 530 | mutex_lock(&block_subsys_lock); |
1da177e4 LT |
531 | list_for_each(p, &block_subsys.kset.list) |
532 | if (!k--) | |
533 | return list_entry(p, struct gendisk, kobj.entry); | |
534 | return NULL; | |
535 | } | |
536 | ||
537 | static void *diskstats_next(struct seq_file *part, void *v, loff_t *pos) | |
538 | { | |
539 | struct list_head *p = ((struct gendisk *)v)->kobj.entry.next; | |
540 | ++*pos; | |
541 | return p==&block_subsys.kset.list ? NULL : | |
542 | list_entry(p, struct gendisk, kobj.entry); | |
543 | } | |
544 | ||
545 | static void diskstats_stop(struct seq_file *part, void *v) | |
546 | { | |
58383af6 | 547 | mutex_unlock(&block_subsys_lock); |
1da177e4 LT |
548 | } |
549 | ||
550 | static int diskstats_show(struct seq_file *s, void *v) | |
551 | { | |
552 | struct gendisk *gp = v; | |
553 | char buf[BDEVNAME_SIZE]; | |
554 | int n = 0; | |
555 | ||
556 | /* | |
557 | if (&sgp->kobj.entry == block_subsys.kset.list.next) | |
558 | seq_puts(s, "major minor name" | |
559 | " rio rmerge rsect ruse wio wmerge " | |
560 | "wsect wuse running use aveq" | |
561 | "\n\n"); | |
562 | */ | |
563 | ||
564 | preempt_disable(); | |
565 | disk_round_stats(gp); | |
566 | preempt_enable(); | |
837c7878 | 567 | seq_printf(s, "%4d %4d %s %lu %lu %llu %u %lu %lu %llu %u %u %u %u\n", |
1da177e4 | 568 | gp->major, n + gp->first_minor, disk_name(gp, n, buf), |
a362357b JA |
569 | disk_stat_read(gp, ios[0]), disk_stat_read(gp, merges[0]), |
570 | (unsigned long long)disk_stat_read(gp, sectors[0]), | |
571 | jiffies_to_msecs(disk_stat_read(gp, ticks[0])), | |
572 | disk_stat_read(gp, ios[1]), disk_stat_read(gp, merges[1]), | |
573 | (unsigned long long)disk_stat_read(gp, sectors[1]), | |
574 | jiffies_to_msecs(disk_stat_read(gp, ticks[1])), | |
1da177e4 LT |
575 | gp->in_flight, |
576 | jiffies_to_msecs(disk_stat_read(gp, io_ticks)), | |
577 | jiffies_to_msecs(disk_stat_read(gp, time_in_queue))); | |
578 | ||
579 | /* now show all non-0 size partitions of it */ | |
580 | for (n = 0; n < gp->minors - 1; n++) { | |
581 | struct hd_struct *hd = gp->part[n]; | |
582 | ||
583 | if (hd && hd->nr_sects) | |
584 | seq_printf(s, "%4d %4d %s %u %u %u %u\n", | |
585 | gp->major, n + gp->first_minor + 1, | |
586 | disk_name(gp, n + 1, buf), | |
a362357b JA |
587 | hd->ios[0], hd->sectors[0], |
588 | hd->ios[1], hd->sectors[1]); | |
1da177e4 LT |
589 | } |
590 | ||
591 | return 0; | |
592 | } | |
593 | ||
594 | struct seq_operations diskstats_op = { | |
595 | .start = diskstats_start, | |
596 | .next = diskstats_next, | |
597 | .stop = diskstats_stop, | |
598 | .show = diskstats_show | |
599 | }; | |
600 | ||
1da177e4 LT |
601 | struct gendisk *alloc_disk(int minors) |
602 | { | |
1946089a CL |
603 | return alloc_disk_node(minors, -1); |
604 | } | |
605 | ||
606 | struct gendisk *alloc_disk_node(int minors, int node_id) | |
607 | { | |
608 | struct gendisk *disk; | |
609 | ||
610 | disk = kmalloc_node(sizeof(struct gendisk), GFP_KERNEL, node_id); | |
1da177e4 LT |
611 | if (disk) { |
612 | memset(disk, 0, sizeof(struct gendisk)); | |
613 | if (!init_disk_stats(disk)) { | |
614 | kfree(disk); | |
615 | return NULL; | |
616 | } | |
617 | if (minors > 1) { | |
618 | int size = (minors - 1) * sizeof(struct hd_struct *); | |
1946089a | 619 | disk->part = kmalloc_node(size, GFP_KERNEL, node_id); |
1da177e4 LT |
620 | if (!disk->part) { |
621 | kfree(disk); | |
622 | return NULL; | |
623 | } | |
624 | memset(disk->part, 0, size); | |
625 | } | |
626 | disk->minors = minors; | |
627 | kobj_set_kset_s(disk,block_subsys); | |
628 | kobject_init(&disk->kobj); | |
629 | rand_initialize_disk(disk); | |
630 | } | |
631 | return disk; | |
632 | } | |
633 | ||
634 | EXPORT_SYMBOL(alloc_disk); | |
1946089a | 635 | EXPORT_SYMBOL(alloc_disk_node); |
1da177e4 LT |
636 | |
637 | struct kobject *get_disk(struct gendisk *disk) | |
638 | { | |
639 | struct module *owner; | |
640 | struct kobject *kobj; | |
641 | ||
642 | if (!disk->fops) | |
643 | return NULL; | |
644 | owner = disk->fops->owner; | |
645 | if (owner && !try_module_get(owner)) | |
646 | return NULL; | |
647 | kobj = kobject_get(&disk->kobj); | |
648 | if (kobj == NULL) { | |
649 | module_put(owner); | |
650 | return NULL; | |
651 | } | |
652 | return kobj; | |
653 | ||
654 | } | |
655 | ||
656 | EXPORT_SYMBOL(get_disk); | |
657 | ||
658 | void put_disk(struct gendisk *disk) | |
659 | { | |
660 | if (disk) | |
661 | kobject_put(&disk->kobj); | |
662 | } | |
663 | ||
664 | EXPORT_SYMBOL(put_disk); | |
665 | ||
666 | void set_device_ro(struct block_device *bdev, int flag) | |
667 | { | |
668 | if (bdev->bd_contains != bdev) | |
669 | bdev->bd_part->policy = flag; | |
670 | else | |
671 | bdev->bd_disk->policy = flag; | |
672 | } | |
673 | ||
674 | EXPORT_SYMBOL(set_device_ro); | |
675 | ||
676 | void set_disk_ro(struct gendisk *disk, int flag) | |
677 | { | |
678 | int i; | |
679 | disk->policy = flag; | |
680 | for (i = 0; i < disk->minors - 1; i++) | |
681 | if (disk->part[i]) disk->part[i]->policy = flag; | |
682 | } | |
683 | ||
684 | EXPORT_SYMBOL(set_disk_ro); | |
685 | ||
686 | int bdev_read_only(struct block_device *bdev) | |
687 | { | |
688 | if (!bdev) | |
689 | return 0; | |
690 | else if (bdev->bd_contains != bdev) | |
691 | return bdev->bd_part->policy; | |
692 | else | |
693 | return bdev->bd_disk->policy; | |
694 | } | |
695 | ||
696 | EXPORT_SYMBOL(bdev_read_only); | |
697 | ||
698 | int invalidate_partition(struct gendisk *disk, int index) | |
699 | { | |
700 | int res = 0; | |
701 | struct block_device *bdev = bdget_disk(disk, index); | |
702 | if (bdev) { | |
2ef41634 CH |
703 | fsync_bdev(bdev); |
704 | res = __invalidate_device(bdev); | |
1da177e4 LT |
705 | bdput(bdev); |
706 | } | |
707 | return res; | |
708 | } | |
709 | ||
710 | EXPORT_SYMBOL(invalidate_partition); |