diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
---|---|---|
committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/block/genhd.c |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/block/genhd.c')
-rw-r--r-- | drivers/block/genhd.c | 685 |
1 files changed, 685 insertions, 0 deletions
diff --git a/drivers/block/genhd.c b/drivers/block/genhd.c new file mode 100644 index 000000000000..ab4db71375e0 --- /dev/null +++ b/drivers/block/genhd.c | |||
@@ -0,0 +1,685 @@ | |||
1 | /* | ||
2 | * gendisk handling | ||
3 | */ | ||
4 | |||
5 | #include <linux/config.h> | ||
6 | #include <linux/module.h> | ||
7 | #include <linux/fs.h> | ||
8 | #include <linux/genhd.h> | ||
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> | ||
17 | |||
18 | #define MAX_PROBE_HASH 255 /* random */ | ||
19 | |||
20 | static struct subsystem block_subsys; | ||
21 | |||
22 | static DECLARE_MUTEX(block_subsys_sem); | ||
23 | |||
24 | /* | ||
25 | * Can be deleted altogether. Later. | ||
26 | * | ||
27 | */ | ||
28 | static struct blk_major_name { | ||
29 | struct blk_major_name *next; | ||
30 | int major; | ||
31 | char name[16]; | ||
32 | } *major_names[MAX_PROBE_HASH]; | ||
33 | |||
34 | /* index in the above - for now: assume no multimajor ranges */ | ||
35 | static inline int major_to_index(int major) | ||
36 | { | ||
37 | return major % MAX_PROBE_HASH; | ||
38 | } | ||
39 | |||
40 | #ifdef CONFIG_PROC_FS | ||
41 | /* get block device names in somewhat random order */ | ||
42 | int get_blkdev_list(char *p) | ||
43 | { | ||
44 | struct blk_major_name *n; | ||
45 | int i, len; | ||
46 | |||
47 | len = sprintf(p, "\nBlock devices:\n"); | ||
48 | |||
49 | down(&block_subsys_sem); | ||
50 | for (i = 0; i < ARRAY_SIZE(major_names); i++) { | ||
51 | for (n = major_names[i]; n; n = n->next) | ||
52 | len += sprintf(p+len, "%3d %s\n", | ||
53 | n->major, n->name); | ||
54 | } | ||
55 | up(&block_subsys_sem); | ||
56 | |||
57 | return len; | ||
58 | } | ||
59 | #endif | ||
60 | |||
61 | int register_blkdev(unsigned int major, const char *name) | ||
62 | { | ||
63 | struct blk_major_name **n, *p; | ||
64 | int index, ret = 0; | ||
65 | |||
66 | down(&block_subsys_sem); | ||
67 | |||
68 | /* temporary */ | ||
69 | if (major == 0) { | ||
70 | for (index = ARRAY_SIZE(major_names)-1; index > 0; index--) { | ||
71 | if (major_names[index] == NULL) | ||
72 | break; | ||
73 | } | ||
74 | |||
75 | if (index == 0) { | ||
76 | printk("register_blkdev: failed to get major for %s\n", | ||
77 | name); | ||
78 | ret = -EBUSY; | ||
79 | goto out; | ||
80 | } | ||
81 | major = index; | ||
82 | ret = major; | ||
83 | } | ||
84 | |||
85 | p = kmalloc(sizeof(struct blk_major_name), GFP_KERNEL); | ||
86 | if (p == NULL) { | ||
87 | ret = -ENOMEM; | ||
88 | goto out; | ||
89 | } | ||
90 | |||
91 | p->major = major; | ||
92 | strlcpy(p->name, name, sizeof(p->name)); | ||
93 | p->next = NULL; | ||
94 | index = major_to_index(major); | ||
95 | |||
96 | for (n = &major_names[index]; *n; n = &(*n)->next) { | ||
97 | if ((*n)->major == major) | ||
98 | break; | ||
99 | } | ||
100 | if (!*n) | ||
101 | *n = p; | ||
102 | else | ||
103 | ret = -EBUSY; | ||
104 | |||
105 | if (ret < 0) { | ||
106 | printk("register_blkdev: cannot get major %d for %s\n", | ||
107 | major, name); | ||
108 | kfree(p); | ||
109 | } | ||
110 | out: | ||
111 | up(&block_subsys_sem); | ||
112 | return ret; | ||
113 | } | ||
114 | |||
115 | EXPORT_SYMBOL(register_blkdev); | ||
116 | |||
117 | /* todo: make void - error printk here */ | ||
118 | int unregister_blkdev(unsigned int major, const char *name) | ||
119 | { | ||
120 | struct blk_major_name **n; | ||
121 | struct blk_major_name *p = NULL; | ||
122 | int index = major_to_index(major); | ||
123 | int ret = 0; | ||
124 | |||
125 | down(&block_subsys_sem); | ||
126 | for (n = &major_names[index]; *n; n = &(*n)->next) | ||
127 | if ((*n)->major == major) | ||
128 | break; | ||
129 | if (!*n || strcmp((*n)->name, name)) | ||
130 | ret = -EINVAL; | ||
131 | else { | ||
132 | p = *n; | ||
133 | *n = p->next; | ||
134 | } | ||
135 | up(&block_subsys_sem); | ||
136 | kfree(p); | ||
137 | |||
138 | return ret; | ||
139 | } | ||
140 | |||
141 | EXPORT_SYMBOL(unregister_blkdev); | ||
142 | |||
143 | static struct kobj_map *bdev_map; | ||
144 | |||
145 | /* | ||
146 | * Register device numbers dev..(dev+range-1) | ||
147 | * range must be nonzero | ||
148 | * The hash chain is sorted on range, so that subranges can override. | ||
149 | */ | ||
150 | void blk_register_region(dev_t dev, unsigned long range, struct module *module, | ||
151 | struct kobject *(*probe)(dev_t, int *, void *), | ||
152 | int (*lock)(dev_t, void *), void *data) | ||
153 | { | ||
154 | kobj_map(bdev_map, dev, range, module, probe, lock, data); | ||
155 | } | ||
156 | |||
157 | EXPORT_SYMBOL(blk_register_region); | ||
158 | |||
159 | void blk_unregister_region(dev_t dev, unsigned long range) | ||
160 | { | ||
161 | kobj_unmap(bdev_map, dev, range); | ||
162 | } | ||
163 | |||
164 | EXPORT_SYMBOL(blk_unregister_region); | ||
165 | |||
166 | static struct kobject *exact_match(dev_t dev, int *part, void *data) | ||
167 | { | ||
168 | struct gendisk *p = data; | ||
169 | return &p->kobj; | ||
170 | } | ||
171 | |||
172 | static int exact_lock(dev_t dev, void *data) | ||
173 | { | ||
174 | struct gendisk *p = data; | ||
175 | |||
176 | if (!get_disk(p)) | ||
177 | return -1; | ||
178 | return 0; | ||
179 | } | ||
180 | |||
181 | /** | ||
182 | * add_disk - add partitioning information to kernel list | ||
183 | * @disk: per-device partitioning information | ||
184 | * | ||
185 | * This function registers the partitioning information in @disk | ||
186 | * with the kernel. | ||
187 | */ | ||
188 | void add_disk(struct gendisk *disk) | ||
189 | { | ||
190 | disk->flags |= GENHD_FL_UP; | ||
191 | blk_register_region(MKDEV(disk->major, disk->first_minor), | ||
192 | disk->minors, NULL, exact_match, exact_lock, disk); | ||
193 | register_disk(disk); | ||
194 | blk_register_queue(disk); | ||
195 | } | ||
196 | |||
197 | EXPORT_SYMBOL(add_disk); | ||
198 | EXPORT_SYMBOL(del_gendisk); /* in partitions/check.c */ | ||
199 | |||
200 | void unlink_gendisk(struct gendisk *disk) | ||
201 | { | ||
202 | blk_unregister_queue(disk); | ||
203 | blk_unregister_region(MKDEV(disk->major, disk->first_minor), | ||
204 | disk->minors); | ||
205 | } | ||
206 | |||
207 | #define to_disk(obj) container_of(obj,struct gendisk,kobj) | ||
208 | |||
209 | /** | ||
210 | * get_gendisk - get partitioning information for a given device | ||
211 | * @dev: device to get partitioning information for | ||
212 | * | ||
213 | * This function gets the structure containing partitioning | ||
214 | * information for the given device @dev. | ||
215 | */ | ||
216 | struct gendisk *get_gendisk(dev_t dev, int *part) | ||
217 | { | ||
218 | struct kobject *kobj = kobj_lookup(bdev_map, dev, part); | ||
219 | return kobj ? to_disk(kobj) : NULL; | ||
220 | } | ||
221 | |||
222 | #ifdef CONFIG_PROC_FS | ||
223 | /* iterator */ | ||
224 | static void *part_start(struct seq_file *part, loff_t *pos) | ||
225 | { | ||
226 | struct list_head *p; | ||
227 | loff_t l = *pos; | ||
228 | |||
229 | down(&block_subsys_sem); | ||
230 | list_for_each(p, &block_subsys.kset.list) | ||
231 | if (!l--) | ||
232 | return list_entry(p, struct gendisk, kobj.entry); | ||
233 | return NULL; | ||
234 | } | ||
235 | |||
236 | static void *part_next(struct seq_file *part, void *v, loff_t *pos) | ||
237 | { | ||
238 | struct list_head *p = ((struct gendisk *)v)->kobj.entry.next; | ||
239 | ++*pos; | ||
240 | return p==&block_subsys.kset.list ? NULL : | ||
241 | list_entry(p, struct gendisk, kobj.entry); | ||
242 | } | ||
243 | |||
244 | static void part_stop(struct seq_file *part, void *v) | ||
245 | { | ||
246 | up(&block_subsys_sem); | ||
247 | } | ||
248 | |||
249 | static int show_partition(struct seq_file *part, void *v) | ||
250 | { | ||
251 | struct gendisk *sgp = v; | ||
252 | int n; | ||
253 | char buf[BDEVNAME_SIZE]; | ||
254 | |||
255 | if (&sgp->kobj.entry == block_subsys.kset.list.next) | ||
256 | seq_puts(part, "major minor #blocks name\n\n"); | ||
257 | |||
258 | /* Don't show non-partitionable removeable devices or empty devices */ | ||
259 | if (!get_capacity(sgp) || | ||
260 | (sgp->minors == 1 && (sgp->flags & GENHD_FL_REMOVABLE))) | ||
261 | return 0; | ||
262 | if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO) | ||
263 | return 0; | ||
264 | |||
265 | /* show the full disk and all non-0 size partitions of it */ | ||
266 | seq_printf(part, "%4d %4d %10llu %s\n", | ||
267 | sgp->major, sgp->first_minor, | ||
268 | (unsigned long long)get_capacity(sgp) >> 1, | ||
269 | disk_name(sgp, 0, buf)); | ||
270 | for (n = 0; n < sgp->minors - 1; n++) { | ||
271 | if (!sgp->part[n]) | ||
272 | continue; | ||
273 | if (sgp->part[n]->nr_sects == 0) | ||
274 | continue; | ||
275 | seq_printf(part, "%4d %4d %10llu %s\n", | ||
276 | sgp->major, n + 1 + sgp->first_minor, | ||
277 | (unsigned long long)sgp->part[n]->nr_sects >> 1 , | ||
278 | disk_name(sgp, n + 1, buf)); | ||
279 | } | ||
280 | |||
281 | return 0; | ||
282 | } | ||
283 | |||
284 | struct seq_operations partitions_op = { | ||
285 | .start =part_start, | ||
286 | .next = part_next, | ||
287 | .stop = part_stop, | ||
288 | .show = show_partition | ||
289 | }; | ||
290 | #endif | ||
291 | |||
292 | |||
293 | extern int blk_dev_init(void); | ||
294 | |||
295 | static struct kobject *base_probe(dev_t dev, int *part, void *data) | ||
296 | { | ||
297 | if (request_module("block-major-%d-%d", MAJOR(dev), MINOR(dev)) > 0) | ||
298 | /* Make old-style 2.4 aliases work */ | ||
299 | request_module("block-major-%d", MAJOR(dev)); | ||
300 | return NULL; | ||
301 | } | ||
302 | |||
303 | static int __init genhd_device_init(void) | ||
304 | { | ||
305 | bdev_map = kobj_map_init(base_probe, &block_subsys_sem); | ||
306 | blk_dev_init(); | ||
307 | subsystem_register(&block_subsys); | ||
308 | return 0; | ||
309 | } | ||
310 | |||
311 | subsys_initcall(genhd_device_init); | ||
312 | |||
313 | |||
314 | |||
315 | /* | ||
316 | * kobject & sysfs bindings for block devices | ||
317 | */ | ||
318 | static ssize_t disk_attr_show(struct kobject *kobj, struct attribute *attr, | ||
319 | char *page) | ||
320 | { | ||
321 | struct gendisk *disk = to_disk(kobj); | ||
322 | struct disk_attribute *disk_attr = | ||
323 | container_of(attr,struct disk_attribute,attr); | ||
324 | ssize_t ret = 0; | ||
325 | |||
326 | if (disk_attr->show) | ||
327 | ret = disk_attr->show(disk,page); | ||
328 | return ret; | ||
329 | } | ||
330 | |||
331 | static struct sysfs_ops disk_sysfs_ops = { | ||
332 | .show = &disk_attr_show, | ||
333 | }; | ||
334 | |||
335 | static ssize_t disk_dev_read(struct gendisk * disk, char *page) | ||
336 | { | ||
337 | dev_t base = MKDEV(disk->major, disk->first_minor); | ||
338 | return print_dev_t(page, base); | ||
339 | } | ||
340 | static ssize_t disk_range_read(struct gendisk * disk, char *page) | ||
341 | { | ||
342 | return sprintf(page, "%d\n", disk->minors); | ||
343 | } | ||
344 | static ssize_t disk_removable_read(struct gendisk * disk, char *page) | ||
345 | { | ||
346 | return sprintf(page, "%d\n", | ||
347 | (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); | ||
348 | |||
349 | } | ||
350 | static ssize_t disk_size_read(struct gendisk * disk, char *page) | ||
351 | { | ||
352 | return sprintf(page, "%llu\n", (unsigned long long)get_capacity(disk)); | ||
353 | } | ||
354 | |||
355 | static ssize_t disk_stats_read(struct gendisk * disk, char *page) | ||
356 | { | ||
357 | preempt_disable(); | ||
358 | disk_round_stats(disk); | ||
359 | preempt_enable(); | ||
360 | return sprintf(page, | ||
361 | "%8u %8u %8llu %8u " | ||
362 | "%8u %8u %8llu %8u " | ||
363 | "%8u %8u %8u" | ||
364 | "\n", | ||
365 | disk_stat_read(disk, reads), disk_stat_read(disk, read_merges), | ||
366 | (unsigned long long)disk_stat_read(disk, read_sectors), | ||
367 | jiffies_to_msecs(disk_stat_read(disk, read_ticks)), | ||
368 | disk_stat_read(disk, writes), | ||
369 | disk_stat_read(disk, write_merges), | ||
370 | (unsigned long long)disk_stat_read(disk, write_sectors), | ||
371 | jiffies_to_msecs(disk_stat_read(disk, write_ticks)), | ||
372 | disk->in_flight, | ||
373 | jiffies_to_msecs(disk_stat_read(disk, io_ticks)), | ||
374 | jiffies_to_msecs(disk_stat_read(disk, time_in_queue))); | ||
375 | } | ||
376 | static struct disk_attribute disk_attr_dev = { | ||
377 | .attr = {.name = "dev", .mode = S_IRUGO }, | ||
378 | .show = disk_dev_read | ||
379 | }; | ||
380 | static struct disk_attribute disk_attr_range = { | ||
381 | .attr = {.name = "range", .mode = S_IRUGO }, | ||
382 | .show = disk_range_read | ||
383 | }; | ||
384 | static struct disk_attribute disk_attr_removable = { | ||
385 | .attr = {.name = "removable", .mode = S_IRUGO }, | ||
386 | .show = disk_removable_read | ||
387 | }; | ||
388 | static struct disk_attribute disk_attr_size = { | ||
389 | .attr = {.name = "size", .mode = S_IRUGO }, | ||
390 | .show = disk_size_read | ||
391 | }; | ||
392 | static struct disk_attribute disk_attr_stat = { | ||
393 | .attr = {.name = "stat", .mode = S_IRUGO }, | ||
394 | .show = disk_stats_read | ||
395 | }; | ||
396 | |||
397 | static struct attribute * default_attrs[] = { | ||
398 | &disk_attr_dev.attr, | ||
399 | &disk_attr_range.attr, | ||
400 | &disk_attr_removable.attr, | ||
401 | &disk_attr_size.attr, | ||
402 | &disk_attr_stat.attr, | ||
403 | NULL, | ||
404 | }; | ||
405 | |||
406 | static void disk_release(struct kobject * kobj) | ||
407 | { | ||
408 | struct gendisk *disk = to_disk(kobj); | ||
409 | kfree(disk->random); | ||
410 | kfree(disk->part); | ||
411 | free_disk_stats(disk); | ||
412 | kfree(disk); | ||
413 | } | ||
414 | |||
415 | static struct kobj_type ktype_block = { | ||
416 | .release = disk_release, | ||
417 | .sysfs_ops = &disk_sysfs_ops, | ||
418 | .default_attrs = default_attrs, | ||
419 | }; | ||
420 | |||
421 | extern struct kobj_type ktype_part; | ||
422 | |||
423 | static int block_hotplug_filter(struct kset *kset, struct kobject *kobj) | ||
424 | { | ||
425 | struct kobj_type *ktype = get_ktype(kobj); | ||
426 | |||
427 | return ((ktype == &ktype_block) || (ktype == &ktype_part)); | ||
428 | } | ||
429 | |||
430 | static int block_hotplug(struct kset *kset, struct kobject *kobj, char **envp, | ||
431 | int num_envp, char *buffer, int buffer_size) | ||
432 | { | ||
433 | struct kobj_type *ktype = get_ktype(kobj); | ||
434 | struct device *physdev; | ||
435 | struct gendisk *disk; | ||
436 | struct hd_struct *part; | ||
437 | int length = 0; | ||
438 | int i = 0; | ||
439 | |||
440 | if (ktype == &ktype_block) { | ||
441 | disk = container_of(kobj, struct gendisk, kobj); | ||
442 | add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, | ||
443 | &length, "MINOR=%u", disk->first_minor); | ||
444 | } else if (ktype == &ktype_part) { | ||
445 | disk = container_of(kobj->parent, struct gendisk, kobj); | ||
446 | part = container_of(kobj, struct hd_struct, kobj); | ||
447 | add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, | ||
448 | &length, "MINOR=%u", | ||
449 | disk->first_minor + part->partno); | ||
450 | } else | ||
451 | return 0; | ||
452 | |||
453 | add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, &length, | ||
454 | "MAJOR=%u", disk->major); | ||
455 | |||
456 | /* add physical device, backing this device */ | ||
457 | physdev = disk->driverfs_dev; | ||
458 | if (physdev) { | ||
459 | char *path = kobject_get_path(&physdev->kobj, GFP_KERNEL); | ||
460 | |||
461 | add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, | ||
462 | &length, "PHYSDEVPATH=%s", path); | ||
463 | kfree(path); | ||
464 | |||
465 | if (physdev->bus) | ||
466 | add_hotplug_env_var(envp, num_envp, &i, | ||
467 | buffer, buffer_size, &length, | ||
468 | "PHYSDEVBUS=%s", | ||
469 | physdev->bus->name); | ||
470 | |||
471 | if (physdev->driver) | ||
472 | add_hotplug_env_var(envp, num_envp, &i, | ||
473 | buffer, buffer_size, &length, | ||
474 | "PHYSDEVDRIVER=%s", | ||
475 | physdev->driver->name); | ||
476 | } | ||
477 | |||
478 | /* terminate, set to next free slot, shrink available space */ | ||
479 | envp[i] = NULL; | ||
480 | envp = &envp[i]; | ||
481 | num_envp -= i; | ||
482 | buffer = &buffer[length]; | ||
483 | buffer_size -= length; | ||
484 | |||
485 | return 0; | ||
486 | } | ||
487 | |||
488 | static struct kset_hotplug_ops block_hotplug_ops = { | ||
489 | .filter = block_hotplug_filter, | ||
490 | .hotplug = block_hotplug, | ||
491 | }; | ||
492 | |||
493 | /* declare block_subsys. */ | ||
494 | static decl_subsys(block, &ktype_block, &block_hotplug_ops); | ||
495 | |||
496 | |||
497 | /* | ||
498 | * aggregate disk stat collector. Uses the same stats that the sysfs | ||
499 | * entries do, above, but makes them available through one seq_file. | ||
500 | * Watching a few disks may be efficient through sysfs, but watching | ||
501 | * all of them will be more efficient through this interface. | ||
502 | * | ||
503 | * The output looks suspiciously like /proc/partitions with a bunch of | ||
504 | * extra fields. | ||
505 | */ | ||
506 | |||
507 | /* iterator */ | ||
508 | static void *diskstats_start(struct seq_file *part, loff_t *pos) | ||
509 | { | ||
510 | loff_t k = *pos; | ||
511 | struct list_head *p; | ||
512 | |||
513 | down(&block_subsys_sem); | ||
514 | list_for_each(p, &block_subsys.kset.list) | ||
515 | if (!k--) | ||
516 | return list_entry(p, struct gendisk, kobj.entry); | ||
517 | return NULL; | ||
518 | } | ||
519 | |||
520 | static void *diskstats_next(struct seq_file *part, void *v, loff_t *pos) | ||
521 | { | ||
522 | struct list_head *p = ((struct gendisk *)v)->kobj.entry.next; | ||
523 | ++*pos; | ||
524 | return p==&block_subsys.kset.list ? NULL : | ||
525 | list_entry(p, struct gendisk, kobj.entry); | ||
526 | } | ||
527 | |||
528 | static void diskstats_stop(struct seq_file *part, void *v) | ||
529 | { | ||
530 | up(&block_subsys_sem); | ||
531 | } | ||
532 | |||
533 | static int diskstats_show(struct seq_file *s, void *v) | ||
534 | { | ||
535 | struct gendisk *gp = v; | ||
536 | char buf[BDEVNAME_SIZE]; | ||
537 | int n = 0; | ||
538 | |||
539 | /* | ||
540 | if (&sgp->kobj.entry == block_subsys.kset.list.next) | ||
541 | seq_puts(s, "major minor name" | ||
542 | " rio rmerge rsect ruse wio wmerge " | ||
543 | "wsect wuse running use aveq" | ||
544 | "\n\n"); | ||
545 | */ | ||
546 | |||
547 | preempt_disable(); | ||
548 | disk_round_stats(gp); | ||
549 | preempt_enable(); | ||
550 | seq_printf(s, "%4d %4d %s %u %u %llu %u %u %u %llu %u %u %u %u\n", | ||
551 | gp->major, n + gp->first_minor, disk_name(gp, n, buf), | ||
552 | disk_stat_read(gp, reads), disk_stat_read(gp, read_merges), | ||
553 | (unsigned long long)disk_stat_read(gp, read_sectors), | ||
554 | jiffies_to_msecs(disk_stat_read(gp, read_ticks)), | ||
555 | disk_stat_read(gp, writes), disk_stat_read(gp, write_merges), | ||
556 | (unsigned long long)disk_stat_read(gp, write_sectors), | ||
557 | jiffies_to_msecs(disk_stat_read(gp, write_ticks)), | ||
558 | gp->in_flight, | ||
559 | jiffies_to_msecs(disk_stat_read(gp, io_ticks)), | ||
560 | jiffies_to_msecs(disk_stat_read(gp, time_in_queue))); | ||
561 | |||
562 | /* now show all non-0 size partitions of it */ | ||
563 | for (n = 0; n < gp->minors - 1; n++) { | ||
564 | struct hd_struct *hd = gp->part[n]; | ||
565 | |||
566 | if (hd && hd->nr_sects) | ||
567 | seq_printf(s, "%4d %4d %s %u %u %u %u\n", | ||
568 | gp->major, n + gp->first_minor + 1, | ||
569 | disk_name(gp, n + 1, buf), | ||
570 | hd->reads, hd->read_sectors, | ||
571 | hd->writes, hd->write_sectors); | ||
572 | } | ||
573 | |||
574 | return 0; | ||
575 | } | ||
576 | |||
577 | struct seq_operations diskstats_op = { | ||
578 | .start = diskstats_start, | ||
579 | .next = diskstats_next, | ||
580 | .stop = diskstats_stop, | ||
581 | .show = diskstats_show | ||
582 | }; | ||
583 | |||
584 | |||
585 | struct gendisk *alloc_disk(int minors) | ||
586 | { | ||
587 | struct gendisk *disk = kmalloc(sizeof(struct gendisk), GFP_KERNEL); | ||
588 | if (disk) { | ||
589 | memset(disk, 0, sizeof(struct gendisk)); | ||
590 | if (!init_disk_stats(disk)) { | ||
591 | kfree(disk); | ||
592 | return NULL; | ||
593 | } | ||
594 | if (minors > 1) { | ||
595 | int size = (minors - 1) * sizeof(struct hd_struct *); | ||
596 | disk->part = kmalloc(size, GFP_KERNEL); | ||
597 | if (!disk->part) { | ||
598 | kfree(disk); | ||
599 | return NULL; | ||
600 | } | ||
601 | memset(disk->part, 0, size); | ||
602 | } | ||
603 | disk->minors = minors; | ||
604 | kobj_set_kset_s(disk,block_subsys); | ||
605 | kobject_init(&disk->kobj); | ||
606 | rand_initialize_disk(disk); | ||
607 | } | ||
608 | return disk; | ||
609 | } | ||
610 | |||
611 | EXPORT_SYMBOL(alloc_disk); | ||
612 | |||
613 | struct kobject *get_disk(struct gendisk *disk) | ||
614 | { | ||
615 | struct module *owner; | ||
616 | struct kobject *kobj; | ||
617 | |||
618 | if (!disk->fops) | ||
619 | return NULL; | ||
620 | owner = disk->fops->owner; | ||
621 | if (owner && !try_module_get(owner)) | ||
622 | return NULL; | ||
623 | kobj = kobject_get(&disk->kobj); | ||
624 | if (kobj == NULL) { | ||
625 | module_put(owner); | ||
626 | return NULL; | ||
627 | } | ||
628 | return kobj; | ||
629 | |||
630 | } | ||
631 | |||
632 | EXPORT_SYMBOL(get_disk); | ||
633 | |||
634 | void put_disk(struct gendisk *disk) | ||
635 | { | ||
636 | if (disk) | ||
637 | kobject_put(&disk->kobj); | ||
638 | } | ||
639 | |||
640 | EXPORT_SYMBOL(put_disk); | ||
641 | |||
642 | void set_device_ro(struct block_device *bdev, int flag) | ||
643 | { | ||
644 | if (bdev->bd_contains != bdev) | ||
645 | bdev->bd_part->policy = flag; | ||
646 | else | ||
647 | bdev->bd_disk->policy = flag; | ||
648 | } | ||
649 | |||
650 | EXPORT_SYMBOL(set_device_ro); | ||
651 | |||
652 | void set_disk_ro(struct gendisk *disk, int flag) | ||
653 | { | ||
654 | int i; | ||
655 | disk->policy = flag; | ||
656 | for (i = 0; i < disk->minors - 1; i++) | ||
657 | if (disk->part[i]) disk->part[i]->policy = flag; | ||
658 | } | ||
659 | |||
660 | EXPORT_SYMBOL(set_disk_ro); | ||
661 | |||
662 | int bdev_read_only(struct block_device *bdev) | ||
663 | { | ||
664 | if (!bdev) | ||
665 | return 0; | ||
666 | else if (bdev->bd_contains != bdev) | ||
667 | return bdev->bd_part->policy; | ||
668 | else | ||
669 | return bdev->bd_disk->policy; | ||
670 | } | ||
671 | |||
672 | EXPORT_SYMBOL(bdev_read_only); | ||
673 | |||
674 | int invalidate_partition(struct gendisk *disk, int index) | ||
675 | { | ||
676 | int res = 0; | ||
677 | struct block_device *bdev = bdget_disk(disk, index); | ||
678 | if (bdev) { | ||
679 | res = __invalidate_device(bdev, 1); | ||
680 | bdput(bdev); | ||
681 | } | ||
682 | return res; | ||
683 | } | ||
684 | |||
685 | EXPORT_SYMBOL(invalidate_partition); | ||