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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 | { | |
cf0ca9fe PZ |
185 | struct backing_dev_info *bdi; |
186 | ||
1da177e4 LT |
187 | disk->flags |= GENHD_FL_UP; |
188 | blk_register_region(MKDEV(disk->major, disk->first_minor), | |
189 | disk->minors, NULL, exact_match, exact_lock, disk); | |
190 | register_disk(disk); | |
191 | blk_register_queue(disk); | |
cf0ca9fe PZ |
192 | |
193 | bdi = &disk->queue->backing_dev_info; | |
194 | bdi_register_dev(bdi, MKDEV(disk->major, disk->first_minor)); | |
195 | sysfs_create_link(&disk->dev.kobj, &bdi->dev->kobj, "bdi"); | |
1da177e4 LT |
196 | } |
197 | ||
198 | EXPORT_SYMBOL(add_disk); | |
199 | EXPORT_SYMBOL(del_gendisk); /* in partitions/check.c */ | |
200 | ||
201 | void unlink_gendisk(struct gendisk *disk) | |
202 | { | |
cf0ca9fe PZ |
203 | sysfs_remove_link(&disk->dev.kobj, "bdi"); |
204 | bdi_unregister(&disk->queue->backing_dev_info); | |
1da177e4 LT |
205 | blk_unregister_queue(disk); |
206 | blk_unregister_region(MKDEV(disk->major, disk->first_minor), | |
207 | disk->minors); | |
208 | } | |
209 | ||
1da177e4 LT |
210 | /** |
211 | * get_gendisk - get partitioning information for a given device | |
212 | * @dev: device to get partitioning information for | |
213 | * | |
214 | * This function gets the structure containing partitioning | |
215 | * information for the given device @dev. | |
216 | */ | |
edfaa7c3 | 217 | struct gendisk *get_gendisk(dev_t devt, int *part) |
1da177e4 | 218 | { |
edfaa7c3 KS |
219 | struct kobject *kobj = kobj_lookup(bdev_map, devt, part); |
220 | struct device *dev = kobj_to_dev(kobj); | |
221 | ||
222 | return kobj ? dev_to_disk(dev) : NULL; | |
1da177e4 LT |
223 | } |
224 | ||
dd2a345f DG |
225 | /* |
226 | * print a full list of all partitions - intended for places where the root | |
227 | * filesystem can't be mounted and thus to give the victim some idea of what | |
228 | * went wrong | |
229 | */ | |
230 | void __init printk_all_partitions(void) | |
231 | { | |
edfaa7c3 | 232 | struct device *dev; |
dd2a345f | 233 | struct gendisk *sgp; |
edfaa7c3 KS |
234 | char buf[BDEVNAME_SIZE]; |
235 | int n; | |
dd2a345f | 236 | |
edfaa7c3 | 237 | mutex_lock(&block_class_lock); |
dd2a345f | 238 | /* For each block device... */ |
edfaa7c3 KS |
239 | list_for_each_entry(dev, &block_class.devices, node) { |
240 | if (dev->type != &disk_type) | |
241 | continue; | |
242 | sgp = dev_to_disk(dev); | |
dd2a345f DG |
243 | /* |
244 | * Don't show empty devices or things that have been surpressed | |
245 | */ | |
246 | if (get_capacity(sgp) == 0 || | |
247 | (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO)) | |
248 | continue; | |
249 | ||
250 | /* | |
251 | * Note, unlike /proc/partitions, I am showing the numbers in | |
252 | * hex - the same format as the root= option takes. | |
253 | */ | |
254 | printk("%02x%02x %10llu %s", | |
255 | sgp->major, sgp->first_minor, | |
256 | (unsigned long long)get_capacity(sgp) >> 1, | |
257 | disk_name(sgp, 0, buf)); | |
258 | if (sgp->driverfs_dev != NULL && | |
259 | sgp->driverfs_dev->driver != NULL) | |
260 | printk(" driver: %s\n", | |
261 | sgp->driverfs_dev->driver->name); | |
262 | else | |
263 | printk(" (driver?)\n"); | |
264 | ||
265 | /* now show the partitions */ | |
266 | for (n = 0; n < sgp->minors - 1; ++n) { | |
267 | if (sgp->part[n] == NULL) | |
268 | continue; | |
269 | if (sgp->part[n]->nr_sects == 0) | |
270 | continue; | |
271 | printk(" %02x%02x %10llu %s\n", | |
272 | sgp->major, n + 1 + sgp->first_minor, | |
273 | (unsigned long long)sgp->part[n]->nr_sects >> 1, | |
274 | disk_name(sgp, n + 1, buf)); | |
edfaa7c3 KS |
275 | } |
276 | } | |
dd2a345f | 277 | |
edfaa7c3 | 278 | mutex_unlock(&block_class_lock); |
dd2a345f DG |
279 | } |
280 | ||
1da177e4 LT |
281 | #ifdef CONFIG_PROC_FS |
282 | /* iterator */ | |
283 | static void *part_start(struct seq_file *part, loff_t *pos) | |
284 | { | |
edfaa7c3 KS |
285 | loff_t k = *pos; |
286 | struct device *dev; | |
1da177e4 | 287 | |
edfaa7c3 KS |
288 | mutex_lock(&block_class_lock); |
289 | list_for_each_entry(dev, &block_class.devices, node) { | |
290 | if (dev->type != &disk_type) | |
291 | continue; | |
292 | if (!k--) | |
293 | return dev_to_disk(dev); | |
294 | } | |
1da177e4 LT |
295 | return NULL; |
296 | } | |
297 | ||
298 | static void *part_next(struct seq_file *part, void *v, loff_t *pos) | |
299 | { | |
edfaa7c3 KS |
300 | struct gendisk *gp = v; |
301 | struct device *dev; | |
1da177e4 | 302 | ++*pos; |
edfaa7c3 KS |
303 | list_for_each_entry(dev, &gp->dev.node, node) { |
304 | if (&dev->node == &block_class.devices) | |
305 | return NULL; | |
306 | if (dev->type == &disk_type) | |
307 | return dev_to_disk(dev); | |
308 | } | |
309 | return NULL; | |
1da177e4 LT |
310 | } |
311 | ||
312 | static void part_stop(struct seq_file *part, void *v) | |
313 | { | |
edfaa7c3 | 314 | mutex_unlock(&block_class_lock); |
1da177e4 LT |
315 | } |
316 | ||
317 | static int show_partition(struct seq_file *part, void *v) | |
318 | { | |
319 | struct gendisk *sgp = v; | |
320 | int n; | |
321 | char buf[BDEVNAME_SIZE]; | |
322 | ||
edfaa7c3 | 323 | if (&sgp->dev.node == block_class.devices.next) |
1da177e4 LT |
324 | seq_puts(part, "major minor #blocks name\n\n"); |
325 | ||
326 | /* Don't show non-partitionable removeable devices or empty devices */ | |
327 | if (!get_capacity(sgp) || | |
328 | (sgp->minors == 1 && (sgp->flags & GENHD_FL_REMOVABLE))) | |
329 | return 0; | |
330 | if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO) | |
331 | return 0; | |
332 | ||
333 | /* show the full disk and all non-0 size partitions of it */ | |
334 | seq_printf(part, "%4d %4d %10llu %s\n", | |
335 | sgp->major, sgp->first_minor, | |
336 | (unsigned long long)get_capacity(sgp) >> 1, | |
337 | disk_name(sgp, 0, buf)); | |
338 | for (n = 0; n < sgp->minors - 1; n++) { | |
339 | if (!sgp->part[n]) | |
340 | continue; | |
341 | if (sgp->part[n]->nr_sects == 0) | |
342 | continue; | |
343 | seq_printf(part, "%4d %4d %10llu %s\n", | |
344 | sgp->major, n + 1 + sgp->first_minor, | |
345 | (unsigned long long)sgp->part[n]->nr_sects >> 1 , | |
346 | disk_name(sgp, n + 1, buf)); | |
347 | } | |
348 | ||
349 | return 0; | |
350 | } | |
351 | ||
12f32bb3 | 352 | const struct seq_operations partitions_op = { |
edfaa7c3 KS |
353 | .start = part_start, |
354 | .next = part_next, | |
355 | .stop = part_stop, | |
356 | .show = show_partition | |
1da177e4 LT |
357 | }; |
358 | #endif | |
359 | ||
360 | ||
edfaa7c3 | 361 | static struct kobject *base_probe(dev_t devt, int *part, void *data) |
1da177e4 | 362 | { |
edfaa7c3 | 363 | if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0) |
1da177e4 | 364 | /* Make old-style 2.4 aliases work */ |
edfaa7c3 | 365 | request_module("block-major-%d", MAJOR(devt)); |
1da177e4 LT |
366 | return NULL; |
367 | } | |
368 | ||
369 | static int __init genhd_device_init(void) | |
370 | { | |
ee27a558 RM |
371 | int error = class_register(&block_class); |
372 | if (unlikely(error)) | |
373 | return error; | |
edfaa7c3 | 374 | bdev_map = kobj_map_init(base_probe, &block_class_lock); |
1da177e4 | 375 | blk_dev_init(); |
edfaa7c3 KS |
376 | |
377 | #ifndef CONFIG_SYSFS_DEPRECATED | |
378 | /* create top-level block dir */ | |
379 | block_depr = kobject_create_and_add("block", NULL); | |
380 | #endif | |
830d3cfb | 381 | return 0; |
1da177e4 LT |
382 | } |
383 | ||
384 | subsys_initcall(genhd_device_init); | |
385 | ||
edfaa7c3 KS |
386 | static ssize_t disk_range_show(struct device *dev, |
387 | struct device_attribute *attr, char *buf) | |
1da177e4 | 388 | { |
edfaa7c3 | 389 | struct gendisk *disk = dev_to_disk(dev); |
1da177e4 | 390 | |
edfaa7c3 | 391 | return sprintf(buf, "%d\n", disk->minors); |
1da177e4 LT |
392 | } |
393 | ||
edfaa7c3 KS |
394 | static ssize_t disk_removable_show(struct device *dev, |
395 | struct device_attribute *attr, char *buf) | |
a7fd6706 | 396 | { |
edfaa7c3 | 397 | struct gendisk *disk = dev_to_disk(dev); |
a7fd6706 | 398 | |
edfaa7c3 KS |
399 | return sprintf(buf, "%d\n", |
400 | (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); | |
a7fd6706 KS |
401 | } |
402 | ||
edfaa7c3 KS |
403 | static ssize_t disk_size_show(struct device *dev, |
404 | struct device_attribute *attr, char *buf) | |
a7fd6706 | 405 | { |
edfaa7c3 | 406 | struct gendisk *disk = dev_to_disk(dev); |
1da177e4 | 407 | |
edfaa7c3 | 408 | return sprintf(buf, "%llu\n", (unsigned long long)get_capacity(disk)); |
1da177e4 | 409 | } |
edfaa7c3 KS |
410 | |
411 | static ssize_t disk_capability_show(struct device *dev, | |
412 | struct device_attribute *attr, char *buf) | |
86ce18d7 | 413 | { |
edfaa7c3 KS |
414 | struct gendisk *disk = dev_to_disk(dev); |
415 | ||
416 | return sprintf(buf, "%x\n", disk->flags); | |
86ce18d7 | 417 | } |
edfaa7c3 KS |
418 | |
419 | static ssize_t disk_stat_show(struct device *dev, | |
420 | struct device_attribute *attr, char *buf) | |
1da177e4 | 421 | { |
edfaa7c3 KS |
422 | struct gendisk *disk = dev_to_disk(dev); |
423 | ||
1da177e4 LT |
424 | preempt_disable(); |
425 | disk_round_stats(disk); | |
426 | preempt_enable(); | |
edfaa7c3 | 427 | return sprintf(buf, |
837c7878 BW |
428 | "%8lu %8lu %8llu %8u " |
429 | "%8lu %8lu %8llu %8u " | |
1da177e4 LT |
430 | "%8u %8u %8u" |
431 | "\n", | |
47a00410 JA |
432 | disk_stat_read(disk, ios[READ]), |
433 | disk_stat_read(disk, merges[READ]), | |
434 | (unsigned long long)disk_stat_read(disk, sectors[READ]), | |
435 | jiffies_to_msecs(disk_stat_read(disk, ticks[READ])), | |
436 | disk_stat_read(disk, ios[WRITE]), | |
437 | disk_stat_read(disk, merges[WRITE]), | |
438 | (unsigned long long)disk_stat_read(disk, sectors[WRITE]), | |
439 | jiffies_to_msecs(disk_stat_read(disk, ticks[WRITE])), | |
1da177e4 LT |
440 | disk->in_flight, |
441 | jiffies_to_msecs(disk_stat_read(disk, io_ticks)), | |
442 | jiffies_to_msecs(disk_stat_read(disk, time_in_queue))); | |
443 | } | |
1da177e4 | 444 | |
c17bb495 | 445 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 KS |
446 | static ssize_t disk_fail_show(struct device *dev, |
447 | struct device_attribute *attr, char *buf) | |
448 | { | |
449 | struct gendisk *disk = dev_to_disk(dev); | |
450 | ||
451 | return sprintf(buf, "%d\n", disk->flags & GENHD_FL_FAIL ? 1 : 0); | |
452 | } | |
c17bb495 | 453 | |
edfaa7c3 KS |
454 | static ssize_t disk_fail_store(struct device *dev, |
455 | struct device_attribute *attr, | |
c17bb495 AM |
456 | const char *buf, size_t count) |
457 | { | |
edfaa7c3 | 458 | struct gendisk *disk = dev_to_disk(dev); |
c17bb495 AM |
459 | int i; |
460 | ||
461 | if (count > 0 && sscanf(buf, "%d", &i) > 0) { | |
462 | if (i == 0) | |
463 | disk->flags &= ~GENHD_FL_FAIL; | |
464 | else | |
465 | disk->flags |= GENHD_FL_FAIL; | |
466 | } | |
467 | ||
468 | return count; | |
469 | } | |
c17bb495 AM |
470 | |
471 | #endif | |
472 | ||
edfaa7c3 KS |
473 | static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL); |
474 | static DEVICE_ATTR(removable, S_IRUGO, disk_removable_show, NULL); | |
475 | static DEVICE_ATTR(size, S_IRUGO, disk_size_show, NULL); | |
476 | static DEVICE_ATTR(capability, S_IRUGO, disk_capability_show, NULL); | |
477 | static DEVICE_ATTR(stat, S_IRUGO, disk_stat_show, NULL); | |
c17bb495 | 478 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 KS |
479 | static struct device_attribute dev_attr_fail = |
480 | __ATTR(make-it-fail, S_IRUGO|S_IWUSR, disk_fail_show, disk_fail_store); | |
c17bb495 | 481 | #endif |
edfaa7c3 KS |
482 | |
483 | static struct attribute *disk_attrs[] = { | |
484 | &dev_attr_range.attr, | |
485 | &dev_attr_removable.attr, | |
486 | &dev_attr_size.attr, | |
487 | &dev_attr_capability.attr, | |
488 | &dev_attr_stat.attr, | |
489 | #ifdef CONFIG_FAIL_MAKE_REQUEST | |
490 | &dev_attr_fail.attr, | |
491 | #endif | |
492 | NULL | |
493 | }; | |
494 | ||
495 | static struct attribute_group disk_attr_group = { | |
496 | .attrs = disk_attrs, | |
497 | }; | |
498 | ||
499 | static struct attribute_group *disk_attr_groups[] = { | |
500 | &disk_attr_group, | |
501 | NULL | |
1da177e4 LT |
502 | }; |
503 | ||
edfaa7c3 | 504 | static void disk_release(struct device *dev) |
1da177e4 | 505 | { |
edfaa7c3 KS |
506 | struct gendisk *disk = dev_to_disk(dev); |
507 | ||
1da177e4 LT |
508 | kfree(disk->random); |
509 | kfree(disk->part); | |
510 | free_disk_stats(disk); | |
511 | kfree(disk); | |
512 | } | |
edfaa7c3 KS |
513 | struct class block_class = { |
514 | .name = "block", | |
1da177e4 LT |
515 | }; |
516 | ||
1826eadf | 517 | static struct device_type disk_type = { |
edfaa7c3 KS |
518 | .name = "disk", |
519 | .groups = disk_attr_groups, | |
520 | .release = disk_release, | |
1da177e4 LT |
521 | }; |
522 | ||
1da177e4 LT |
523 | /* |
524 | * aggregate disk stat collector. Uses the same stats that the sysfs | |
525 | * entries do, above, but makes them available through one seq_file. | |
1da177e4 LT |
526 | * |
527 | * The output looks suspiciously like /proc/partitions with a bunch of | |
528 | * extra fields. | |
529 | */ | |
530 | ||
1da177e4 LT |
531 | static void *diskstats_start(struct seq_file *part, loff_t *pos) |
532 | { | |
533 | loff_t k = *pos; | |
edfaa7c3 | 534 | struct device *dev; |
1da177e4 | 535 | |
edfaa7c3 KS |
536 | mutex_lock(&block_class_lock); |
537 | list_for_each_entry(dev, &block_class.devices, node) { | |
538 | if (dev->type != &disk_type) | |
539 | continue; | |
1da177e4 | 540 | if (!k--) |
edfaa7c3 KS |
541 | return dev_to_disk(dev); |
542 | } | |
1da177e4 LT |
543 | return NULL; |
544 | } | |
545 | ||
546 | static void *diskstats_next(struct seq_file *part, void *v, loff_t *pos) | |
547 | { | |
edfaa7c3 KS |
548 | struct gendisk *gp = v; |
549 | struct device *dev; | |
550 | ||
1da177e4 | 551 | ++*pos; |
edfaa7c3 KS |
552 | list_for_each_entry(dev, &gp->dev.node, node) { |
553 | if (&dev->node == &block_class.devices) | |
554 | return NULL; | |
555 | if (dev->type == &disk_type) | |
556 | return dev_to_disk(dev); | |
557 | } | |
558 | return NULL; | |
1da177e4 LT |
559 | } |
560 | ||
561 | static void diskstats_stop(struct seq_file *part, void *v) | |
562 | { | |
edfaa7c3 | 563 | mutex_unlock(&block_class_lock); |
1da177e4 LT |
564 | } |
565 | ||
566 | static int diskstats_show(struct seq_file *s, void *v) | |
567 | { | |
568 | struct gendisk *gp = v; | |
569 | char buf[BDEVNAME_SIZE]; | |
570 | int n = 0; | |
571 | ||
572 | /* | |
edfaa7c3 | 573 | if (&gp->dev.kobj.entry == block_class.devices.next) |
1da177e4 LT |
574 | seq_puts(s, "major minor name" |
575 | " rio rmerge rsect ruse wio wmerge " | |
576 | "wsect wuse running use aveq" | |
577 | "\n\n"); | |
578 | */ | |
579 | ||
580 | preempt_disable(); | |
581 | disk_round_stats(gp); | |
582 | preempt_enable(); | |
837c7878 | 583 | seq_printf(s, "%4d %4d %s %lu %lu %llu %u %lu %lu %llu %u %u %u %u\n", |
1da177e4 | 584 | gp->major, n + gp->first_minor, disk_name(gp, n, buf), |
a362357b JA |
585 | disk_stat_read(gp, ios[0]), disk_stat_read(gp, merges[0]), |
586 | (unsigned long long)disk_stat_read(gp, sectors[0]), | |
587 | jiffies_to_msecs(disk_stat_read(gp, ticks[0])), | |
588 | disk_stat_read(gp, ios[1]), disk_stat_read(gp, merges[1]), | |
589 | (unsigned long long)disk_stat_read(gp, sectors[1]), | |
590 | jiffies_to_msecs(disk_stat_read(gp, ticks[1])), | |
1da177e4 LT |
591 | gp->in_flight, |
592 | jiffies_to_msecs(disk_stat_read(gp, io_ticks)), | |
593 | jiffies_to_msecs(disk_stat_read(gp, time_in_queue))); | |
594 | ||
595 | /* now show all non-0 size partitions of it */ | |
596 | for (n = 0; n < gp->minors - 1; n++) { | |
597 | struct hd_struct *hd = gp->part[n]; | |
598 | ||
28f39d55 JM |
599 | if (!hd || !hd->nr_sects) |
600 | continue; | |
601 | ||
602 | preempt_disable(); | |
603 | part_round_stats(hd); | |
604 | preempt_enable(); | |
605 | seq_printf(s, "%4d %4d %s %lu %lu %llu " | |
606 | "%u %lu %lu %llu %u %u %u %u\n", | |
607 | gp->major, n + gp->first_minor + 1, | |
608 | disk_name(gp, n + 1, buf), | |
609 | part_stat_read(hd, ios[0]), | |
610 | part_stat_read(hd, merges[0]), | |
611 | (unsigned long long)part_stat_read(hd, sectors[0]), | |
612 | jiffies_to_msecs(part_stat_read(hd, ticks[0])), | |
613 | part_stat_read(hd, ios[1]), | |
614 | part_stat_read(hd, merges[1]), | |
615 | (unsigned long long)part_stat_read(hd, sectors[1]), | |
616 | jiffies_to_msecs(part_stat_read(hd, ticks[1])), | |
617 | hd->in_flight, | |
618 | jiffies_to_msecs(part_stat_read(hd, io_ticks)), | |
619 | jiffies_to_msecs(part_stat_read(hd, time_in_queue)) | |
620 | ); | |
1da177e4 LT |
621 | } |
622 | ||
623 | return 0; | |
624 | } | |
625 | ||
12f32bb3 | 626 | const struct seq_operations diskstats_op = { |
1da177e4 LT |
627 | .start = diskstats_start, |
628 | .next = diskstats_next, | |
629 | .stop = diskstats_stop, | |
630 | .show = diskstats_show | |
631 | }; | |
632 | ||
8ce7ad7b KCA |
633 | static void media_change_notify_thread(struct work_struct *work) |
634 | { | |
635 | struct gendisk *gd = container_of(work, struct gendisk, async_notify); | |
636 | char event[] = "MEDIA_CHANGE=1"; | |
637 | char *envp[] = { event, NULL }; | |
638 | ||
639 | /* | |
640 | * set enviroment vars to indicate which event this is for | |
641 | * so that user space will know to go check the media status. | |
642 | */ | |
edfaa7c3 | 643 | kobject_uevent_env(&gd->dev.kobj, KOBJ_CHANGE, envp); |
8ce7ad7b KCA |
644 | put_device(gd->driverfs_dev); |
645 | } | |
646 | ||
1826eadf | 647 | #if 0 |
8ce7ad7b KCA |
648 | void genhd_media_change_notify(struct gendisk *disk) |
649 | { | |
650 | get_device(disk->driverfs_dev); | |
651 | schedule_work(&disk->async_notify); | |
652 | } | |
653 | EXPORT_SYMBOL_GPL(genhd_media_change_notify); | |
1826eadf | 654 | #endif /* 0 */ |
8ce7ad7b | 655 | |
edfaa7c3 KS |
656 | dev_t blk_lookup_devt(const char *name) |
657 | { | |
658 | struct device *dev; | |
659 | dev_t devt = MKDEV(0, 0); | |
660 | ||
661 | mutex_lock(&block_class_lock); | |
662 | list_for_each_entry(dev, &block_class.devices, node) { | |
663 | if (strcmp(dev->bus_id, name) == 0) { | |
664 | devt = dev->devt; | |
665 | break; | |
666 | } | |
667 | } | |
668 | mutex_unlock(&block_class_lock); | |
669 | ||
670 | return devt; | |
671 | } | |
672 | ||
673 | EXPORT_SYMBOL(blk_lookup_devt); | |
674 | ||
1da177e4 LT |
675 | struct gendisk *alloc_disk(int minors) |
676 | { | |
1946089a CL |
677 | return alloc_disk_node(minors, -1); |
678 | } | |
679 | ||
680 | struct gendisk *alloc_disk_node(int minors, int node_id) | |
681 | { | |
682 | struct gendisk *disk; | |
683 | ||
94f6030c CL |
684 | disk = kmalloc_node(sizeof(struct gendisk), |
685 | GFP_KERNEL | __GFP_ZERO, node_id); | |
1da177e4 | 686 | if (disk) { |
1da177e4 LT |
687 | if (!init_disk_stats(disk)) { |
688 | kfree(disk); | |
689 | return NULL; | |
690 | } | |
691 | if (minors > 1) { | |
692 | int size = (minors - 1) * sizeof(struct hd_struct *); | |
94f6030c CL |
693 | disk->part = kmalloc_node(size, |
694 | GFP_KERNEL | __GFP_ZERO, node_id); | |
1da177e4 | 695 | if (!disk->part) { |
c7674030 | 696 | free_disk_stats(disk); |
1da177e4 LT |
697 | kfree(disk); |
698 | return NULL; | |
699 | } | |
1da177e4 LT |
700 | } |
701 | disk->minors = minors; | |
1da177e4 | 702 | rand_initialize_disk(disk); |
edfaa7c3 KS |
703 | disk->dev.class = &block_class; |
704 | disk->dev.type = &disk_type; | |
705 | device_initialize(&disk->dev); | |
8ce7ad7b KCA |
706 | INIT_WORK(&disk->async_notify, |
707 | media_change_notify_thread); | |
1da177e4 LT |
708 | } |
709 | return disk; | |
710 | } | |
711 | ||
712 | EXPORT_SYMBOL(alloc_disk); | |
1946089a | 713 | EXPORT_SYMBOL(alloc_disk_node); |
1da177e4 LT |
714 | |
715 | struct kobject *get_disk(struct gendisk *disk) | |
716 | { | |
717 | struct module *owner; | |
718 | struct kobject *kobj; | |
719 | ||
720 | if (!disk->fops) | |
721 | return NULL; | |
722 | owner = disk->fops->owner; | |
723 | if (owner && !try_module_get(owner)) | |
724 | return NULL; | |
edfaa7c3 | 725 | kobj = kobject_get(&disk->dev.kobj); |
1da177e4 LT |
726 | if (kobj == NULL) { |
727 | module_put(owner); | |
728 | return NULL; | |
729 | } | |
730 | return kobj; | |
731 | ||
732 | } | |
733 | ||
734 | EXPORT_SYMBOL(get_disk); | |
735 | ||
736 | void put_disk(struct gendisk *disk) | |
737 | { | |
738 | if (disk) | |
edfaa7c3 | 739 | kobject_put(&disk->dev.kobj); |
1da177e4 LT |
740 | } |
741 | ||
742 | EXPORT_SYMBOL(put_disk); | |
743 | ||
744 | void set_device_ro(struct block_device *bdev, int flag) | |
745 | { | |
746 | if (bdev->bd_contains != bdev) | |
747 | bdev->bd_part->policy = flag; | |
748 | else | |
749 | bdev->bd_disk->policy = flag; | |
750 | } | |
751 | ||
752 | EXPORT_SYMBOL(set_device_ro); | |
753 | ||
754 | void set_disk_ro(struct gendisk *disk, int flag) | |
755 | { | |
756 | int i; | |
757 | disk->policy = flag; | |
758 | for (i = 0; i < disk->minors - 1; i++) | |
759 | if (disk->part[i]) disk->part[i]->policy = flag; | |
760 | } | |
761 | ||
762 | EXPORT_SYMBOL(set_disk_ro); | |
763 | ||
764 | int bdev_read_only(struct block_device *bdev) | |
765 | { | |
766 | if (!bdev) | |
767 | return 0; | |
768 | else if (bdev->bd_contains != bdev) | |
769 | return bdev->bd_part->policy; | |
770 | else | |
771 | return bdev->bd_disk->policy; | |
772 | } | |
773 | ||
774 | EXPORT_SYMBOL(bdev_read_only); | |
775 | ||
776 | int invalidate_partition(struct gendisk *disk, int index) | |
777 | { | |
778 | int res = 0; | |
779 | struct block_device *bdev = bdget_disk(disk, index); | |
780 | if (bdev) { | |
2ef41634 CH |
781 | fsync_bdev(bdev); |
782 | res = __invalidate_device(bdev); | |
1da177e4 LT |
783 | bdput(bdev); |
784 | } | |
785 | return res; | |
786 | } | |
787 | ||
788 | EXPORT_SYMBOL(invalidate_partition); |