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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 | 185 | struct backing_dev_info *bdi; |
6ffeea77 | 186 | int retval; |
cf0ca9fe | 187 | |
1da177e4 LT |
188 | disk->flags |= GENHD_FL_UP; |
189 | blk_register_region(MKDEV(disk->major, disk->first_minor), | |
190 | disk->minors, NULL, exact_match, exact_lock, disk); | |
191 | register_disk(disk); | |
192 | blk_register_queue(disk); | |
0b07de85 | 193 | blk_register_filter(disk); |
cf0ca9fe PZ |
194 | |
195 | bdi = &disk->queue->backing_dev_info; | |
196 | bdi_register_dev(bdi, MKDEV(disk->major, disk->first_minor)); | |
6ffeea77 GKH |
197 | retval = sysfs_create_link(&disk->dev.kobj, &bdi->dev->kobj, "bdi"); |
198 | WARN_ON(retval); | |
1da177e4 LT |
199 | } |
200 | ||
201 | EXPORT_SYMBOL(add_disk); | |
202 | EXPORT_SYMBOL(del_gendisk); /* in partitions/check.c */ | |
203 | ||
204 | void unlink_gendisk(struct gendisk *disk) | |
205 | { | |
0b07de85 | 206 | blk_unregister_filter(disk); |
cf0ca9fe PZ |
207 | sysfs_remove_link(&disk->dev.kobj, "bdi"); |
208 | bdi_unregister(&disk->queue->backing_dev_info); | |
1da177e4 LT |
209 | blk_unregister_queue(disk); |
210 | blk_unregister_region(MKDEV(disk->major, disk->first_minor), | |
211 | disk->minors); | |
212 | } | |
213 | ||
1da177e4 LT |
214 | /** |
215 | * get_gendisk - get partitioning information for a given device | |
216 | * @dev: device to get partitioning information for | |
217 | * | |
218 | * This function gets the structure containing partitioning | |
219 | * information for the given device @dev. | |
220 | */ | |
edfaa7c3 | 221 | struct gendisk *get_gendisk(dev_t devt, int *part) |
1da177e4 | 222 | { |
edfaa7c3 KS |
223 | struct kobject *kobj = kobj_lookup(bdev_map, devt, part); |
224 | struct device *dev = kobj_to_dev(kobj); | |
225 | ||
226 | return kobj ? dev_to_disk(dev) : NULL; | |
1da177e4 LT |
227 | } |
228 | ||
dd2a345f | 229 | /* |
5c6f35c5 GKH |
230 | * print a partitions - intended for places where the root filesystem can't be |
231 | * mounted and thus to give the victim some idea of what went wrong | |
dd2a345f | 232 | */ |
5c6f35c5 | 233 | static int printk_partition(struct device *dev, void *data) |
dd2a345f | 234 | { |
dd2a345f | 235 | struct gendisk *sgp; |
edfaa7c3 KS |
236 | char buf[BDEVNAME_SIZE]; |
237 | int n; | |
dd2a345f | 238 | |
5c6f35c5 GKH |
239 | if (dev->type != &disk_type) |
240 | goto exit; | |
241 | ||
242 | sgp = dev_to_disk(dev); | |
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 | goto exit; | |
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 | goto exit; | |
269 | if (sgp->part[n]->nr_sects == 0) | |
270 | goto exit; | |
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 | 275 | } |
5c6f35c5 GKH |
276 | exit: |
277 | return 0; | |
278 | } | |
dd2a345f | 279 | |
5c6f35c5 GKH |
280 | /* |
281 | * print a full list of all partitions - intended for places where the root | |
282 | * filesystem can't be mounted and thus to give the victim some idea of what | |
283 | * went wrong | |
284 | */ | |
285 | void __init printk_all_partitions(void) | |
286 | { | |
287 | mutex_lock(&block_class_lock); | |
288 | class_for_each_device(&block_class, NULL, NULL, printk_partition); | |
edfaa7c3 | 289 | mutex_unlock(&block_class_lock); |
dd2a345f DG |
290 | } |
291 | ||
1da177e4 LT |
292 | #ifdef CONFIG_PROC_FS |
293 | /* iterator */ | |
294 | static void *part_start(struct seq_file *part, loff_t *pos) | |
295 | { | |
edfaa7c3 KS |
296 | loff_t k = *pos; |
297 | struct device *dev; | |
1da177e4 | 298 | |
edfaa7c3 KS |
299 | mutex_lock(&block_class_lock); |
300 | list_for_each_entry(dev, &block_class.devices, node) { | |
301 | if (dev->type != &disk_type) | |
302 | continue; | |
303 | if (!k--) | |
304 | return dev_to_disk(dev); | |
305 | } | |
1da177e4 LT |
306 | return NULL; |
307 | } | |
308 | ||
309 | static void *part_next(struct seq_file *part, void *v, loff_t *pos) | |
310 | { | |
edfaa7c3 KS |
311 | struct gendisk *gp = v; |
312 | struct device *dev; | |
1da177e4 | 313 | ++*pos; |
edfaa7c3 KS |
314 | list_for_each_entry(dev, &gp->dev.node, node) { |
315 | if (&dev->node == &block_class.devices) | |
316 | return NULL; | |
317 | if (dev->type == &disk_type) | |
318 | return dev_to_disk(dev); | |
319 | } | |
320 | return NULL; | |
1da177e4 LT |
321 | } |
322 | ||
323 | static void part_stop(struct seq_file *part, void *v) | |
324 | { | |
edfaa7c3 | 325 | mutex_unlock(&block_class_lock); |
1da177e4 LT |
326 | } |
327 | ||
328 | static int show_partition(struct seq_file *part, void *v) | |
329 | { | |
330 | struct gendisk *sgp = v; | |
331 | int n; | |
332 | char buf[BDEVNAME_SIZE]; | |
333 | ||
edfaa7c3 | 334 | if (&sgp->dev.node == block_class.devices.next) |
1da177e4 LT |
335 | seq_puts(part, "major minor #blocks name\n\n"); |
336 | ||
337 | /* Don't show non-partitionable removeable devices or empty devices */ | |
338 | if (!get_capacity(sgp) || | |
339 | (sgp->minors == 1 && (sgp->flags & GENHD_FL_REMOVABLE))) | |
340 | return 0; | |
341 | if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO) | |
342 | return 0; | |
343 | ||
344 | /* show the full disk and all non-0 size partitions of it */ | |
345 | seq_printf(part, "%4d %4d %10llu %s\n", | |
346 | sgp->major, sgp->first_minor, | |
347 | (unsigned long long)get_capacity(sgp) >> 1, | |
348 | disk_name(sgp, 0, buf)); | |
349 | for (n = 0; n < sgp->minors - 1; n++) { | |
350 | if (!sgp->part[n]) | |
351 | continue; | |
352 | if (sgp->part[n]->nr_sects == 0) | |
353 | continue; | |
354 | seq_printf(part, "%4d %4d %10llu %s\n", | |
355 | sgp->major, n + 1 + sgp->first_minor, | |
356 | (unsigned long long)sgp->part[n]->nr_sects >> 1 , | |
357 | disk_name(sgp, n + 1, buf)); | |
358 | } | |
359 | ||
360 | return 0; | |
361 | } | |
362 | ||
12f32bb3 | 363 | const struct seq_operations partitions_op = { |
edfaa7c3 KS |
364 | .start = part_start, |
365 | .next = part_next, | |
366 | .stop = part_stop, | |
367 | .show = show_partition | |
1da177e4 LT |
368 | }; |
369 | #endif | |
370 | ||
371 | ||
edfaa7c3 | 372 | static struct kobject *base_probe(dev_t devt, int *part, void *data) |
1da177e4 | 373 | { |
edfaa7c3 | 374 | if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0) |
1da177e4 | 375 | /* Make old-style 2.4 aliases work */ |
edfaa7c3 | 376 | request_module("block-major-%d", MAJOR(devt)); |
1da177e4 LT |
377 | return NULL; |
378 | } | |
379 | ||
380 | static int __init genhd_device_init(void) | |
381 | { | |
e105b8bf DW |
382 | int error; |
383 | ||
384 | block_class.dev_kobj = sysfs_dev_block_kobj; | |
385 | error = class_register(&block_class); | |
ee27a558 RM |
386 | if (unlikely(error)) |
387 | return error; | |
edfaa7c3 | 388 | bdev_map = kobj_map_init(base_probe, &block_class_lock); |
1da177e4 | 389 | blk_dev_init(); |
edfaa7c3 KS |
390 | |
391 | #ifndef CONFIG_SYSFS_DEPRECATED | |
392 | /* create top-level block dir */ | |
393 | block_depr = kobject_create_and_add("block", NULL); | |
394 | #endif | |
830d3cfb | 395 | return 0; |
1da177e4 LT |
396 | } |
397 | ||
398 | subsys_initcall(genhd_device_init); | |
399 | ||
edfaa7c3 KS |
400 | static ssize_t disk_range_show(struct device *dev, |
401 | struct device_attribute *attr, char *buf) | |
1da177e4 | 402 | { |
edfaa7c3 | 403 | struct gendisk *disk = dev_to_disk(dev); |
1da177e4 | 404 | |
edfaa7c3 | 405 | return sprintf(buf, "%d\n", disk->minors); |
1da177e4 LT |
406 | } |
407 | ||
edfaa7c3 KS |
408 | static ssize_t disk_removable_show(struct device *dev, |
409 | struct device_attribute *attr, char *buf) | |
a7fd6706 | 410 | { |
edfaa7c3 | 411 | struct gendisk *disk = dev_to_disk(dev); |
a7fd6706 | 412 | |
edfaa7c3 KS |
413 | return sprintf(buf, "%d\n", |
414 | (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); | |
a7fd6706 KS |
415 | } |
416 | ||
1c9ce527 KS |
417 | static ssize_t disk_ro_show(struct device *dev, |
418 | struct device_attribute *attr, char *buf) | |
419 | { | |
420 | struct gendisk *disk = dev_to_disk(dev); | |
421 | ||
422 | return sprintf(buf, "%d\n", disk->policy ? 1 : 0); | |
423 | } | |
424 | ||
edfaa7c3 KS |
425 | static ssize_t disk_size_show(struct device *dev, |
426 | struct device_attribute *attr, char *buf) | |
a7fd6706 | 427 | { |
edfaa7c3 | 428 | struct gendisk *disk = dev_to_disk(dev); |
1da177e4 | 429 | |
edfaa7c3 | 430 | return sprintf(buf, "%llu\n", (unsigned long long)get_capacity(disk)); |
1da177e4 | 431 | } |
edfaa7c3 KS |
432 | |
433 | static ssize_t disk_capability_show(struct device *dev, | |
434 | struct device_attribute *attr, char *buf) | |
86ce18d7 | 435 | { |
edfaa7c3 KS |
436 | struct gendisk *disk = dev_to_disk(dev); |
437 | ||
438 | return sprintf(buf, "%x\n", disk->flags); | |
86ce18d7 | 439 | } |
edfaa7c3 KS |
440 | |
441 | static ssize_t disk_stat_show(struct device *dev, | |
442 | struct device_attribute *attr, char *buf) | |
1da177e4 | 443 | { |
edfaa7c3 KS |
444 | struct gendisk *disk = dev_to_disk(dev); |
445 | ||
1da177e4 LT |
446 | preempt_disable(); |
447 | disk_round_stats(disk); | |
448 | preempt_enable(); | |
edfaa7c3 | 449 | return sprintf(buf, |
837c7878 BW |
450 | "%8lu %8lu %8llu %8u " |
451 | "%8lu %8lu %8llu %8u " | |
1da177e4 LT |
452 | "%8u %8u %8u" |
453 | "\n", | |
47a00410 JA |
454 | disk_stat_read(disk, ios[READ]), |
455 | disk_stat_read(disk, merges[READ]), | |
456 | (unsigned long long)disk_stat_read(disk, sectors[READ]), | |
457 | jiffies_to_msecs(disk_stat_read(disk, ticks[READ])), | |
458 | disk_stat_read(disk, ios[WRITE]), | |
459 | disk_stat_read(disk, merges[WRITE]), | |
460 | (unsigned long long)disk_stat_read(disk, sectors[WRITE]), | |
461 | jiffies_to_msecs(disk_stat_read(disk, ticks[WRITE])), | |
1da177e4 LT |
462 | disk->in_flight, |
463 | jiffies_to_msecs(disk_stat_read(disk, io_ticks)), | |
464 | jiffies_to_msecs(disk_stat_read(disk, time_in_queue))); | |
465 | } | |
1da177e4 | 466 | |
c17bb495 | 467 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 KS |
468 | static ssize_t disk_fail_show(struct device *dev, |
469 | struct device_attribute *attr, char *buf) | |
470 | { | |
471 | struct gendisk *disk = dev_to_disk(dev); | |
472 | ||
473 | return sprintf(buf, "%d\n", disk->flags & GENHD_FL_FAIL ? 1 : 0); | |
474 | } | |
c17bb495 | 475 | |
edfaa7c3 KS |
476 | static ssize_t disk_fail_store(struct device *dev, |
477 | struct device_attribute *attr, | |
c17bb495 AM |
478 | const char *buf, size_t count) |
479 | { | |
edfaa7c3 | 480 | struct gendisk *disk = dev_to_disk(dev); |
c17bb495 AM |
481 | int i; |
482 | ||
483 | if (count > 0 && sscanf(buf, "%d", &i) > 0) { | |
484 | if (i == 0) | |
485 | disk->flags &= ~GENHD_FL_FAIL; | |
486 | else | |
487 | disk->flags |= GENHD_FL_FAIL; | |
488 | } | |
489 | ||
490 | return count; | |
491 | } | |
c17bb495 AM |
492 | |
493 | #endif | |
494 | ||
edfaa7c3 KS |
495 | static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL); |
496 | static DEVICE_ATTR(removable, S_IRUGO, disk_removable_show, NULL); | |
1c9ce527 | 497 | static DEVICE_ATTR(ro, S_IRUGO, disk_ro_show, NULL); |
edfaa7c3 KS |
498 | static DEVICE_ATTR(size, S_IRUGO, disk_size_show, NULL); |
499 | static DEVICE_ATTR(capability, S_IRUGO, disk_capability_show, NULL); | |
500 | static DEVICE_ATTR(stat, S_IRUGO, disk_stat_show, NULL); | |
c17bb495 | 501 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 KS |
502 | static struct device_attribute dev_attr_fail = |
503 | __ATTR(make-it-fail, S_IRUGO|S_IWUSR, disk_fail_show, disk_fail_store); | |
c17bb495 | 504 | #endif |
edfaa7c3 KS |
505 | |
506 | static struct attribute *disk_attrs[] = { | |
507 | &dev_attr_range.attr, | |
508 | &dev_attr_removable.attr, | |
1c9ce527 | 509 | &dev_attr_ro.attr, |
edfaa7c3 KS |
510 | &dev_attr_size.attr, |
511 | &dev_attr_capability.attr, | |
512 | &dev_attr_stat.attr, | |
513 | #ifdef CONFIG_FAIL_MAKE_REQUEST | |
514 | &dev_attr_fail.attr, | |
515 | #endif | |
516 | NULL | |
517 | }; | |
518 | ||
519 | static struct attribute_group disk_attr_group = { | |
520 | .attrs = disk_attrs, | |
521 | }; | |
522 | ||
523 | static struct attribute_group *disk_attr_groups[] = { | |
524 | &disk_attr_group, | |
525 | NULL | |
1da177e4 LT |
526 | }; |
527 | ||
edfaa7c3 | 528 | static void disk_release(struct device *dev) |
1da177e4 | 529 | { |
edfaa7c3 KS |
530 | struct gendisk *disk = dev_to_disk(dev); |
531 | ||
1da177e4 LT |
532 | kfree(disk->random); |
533 | kfree(disk->part); | |
534 | free_disk_stats(disk); | |
535 | kfree(disk); | |
536 | } | |
edfaa7c3 KS |
537 | struct class block_class = { |
538 | .name = "block", | |
1da177e4 LT |
539 | }; |
540 | ||
1826eadf | 541 | static struct device_type disk_type = { |
edfaa7c3 KS |
542 | .name = "disk", |
543 | .groups = disk_attr_groups, | |
544 | .release = disk_release, | |
1da177e4 LT |
545 | }; |
546 | ||
1da177e4 LT |
547 | /* |
548 | * aggregate disk stat collector. Uses the same stats that the sysfs | |
549 | * entries do, above, but makes them available through one seq_file. | |
1da177e4 LT |
550 | * |
551 | * The output looks suspiciously like /proc/partitions with a bunch of | |
552 | * extra fields. | |
553 | */ | |
554 | ||
1da177e4 LT |
555 | static void *diskstats_start(struct seq_file *part, loff_t *pos) |
556 | { | |
557 | loff_t k = *pos; | |
edfaa7c3 | 558 | struct device *dev; |
1da177e4 | 559 | |
edfaa7c3 KS |
560 | mutex_lock(&block_class_lock); |
561 | list_for_each_entry(dev, &block_class.devices, node) { | |
562 | if (dev->type != &disk_type) | |
563 | continue; | |
1da177e4 | 564 | if (!k--) |
edfaa7c3 KS |
565 | return dev_to_disk(dev); |
566 | } | |
1da177e4 LT |
567 | return NULL; |
568 | } | |
569 | ||
570 | static void *diskstats_next(struct seq_file *part, void *v, loff_t *pos) | |
571 | { | |
edfaa7c3 KS |
572 | struct gendisk *gp = v; |
573 | struct device *dev; | |
574 | ||
1da177e4 | 575 | ++*pos; |
edfaa7c3 KS |
576 | list_for_each_entry(dev, &gp->dev.node, node) { |
577 | if (&dev->node == &block_class.devices) | |
578 | return NULL; | |
579 | if (dev->type == &disk_type) | |
580 | return dev_to_disk(dev); | |
581 | } | |
582 | return NULL; | |
1da177e4 LT |
583 | } |
584 | ||
585 | static void diskstats_stop(struct seq_file *part, void *v) | |
586 | { | |
edfaa7c3 | 587 | mutex_unlock(&block_class_lock); |
1da177e4 LT |
588 | } |
589 | ||
590 | static int diskstats_show(struct seq_file *s, void *v) | |
591 | { | |
592 | struct gendisk *gp = v; | |
593 | char buf[BDEVNAME_SIZE]; | |
594 | int n = 0; | |
595 | ||
596 | /* | |
edfaa7c3 | 597 | if (&gp->dev.kobj.entry == block_class.devices.next) |
1da177e4 LT |
598 | seq_puts(s, "major minor name" |
599 | " rio rmerge rsect ruse wio wmerge " | |
600 | "wsect wuse running use aveq" | |
601 | "\n\n"); | |
602 | */ | |
603 | ||
604 | preempt_disable(); | |
605 | disk_round_stats(gp); | |
606 | preempt_enable(); | |
837c7878 | 607 | seq_printf(s, "%4d %4d %s %lu %lu %llu %u %lu %lu %llu %u %u %u %u\n", |
1da177e4 | 608 | gp->major, n + gp->first_minor, disk_name(gp, n, buf), |
a362357b JA |
609 | disk_stat_read(gp, ios[0]), disk_stat_read(gp, merges[0]), |
610 | (unsigned long long)disk_stat_read(gp, sectors[0]), | |
611 | jiffies_to_msecs(disk_stat_read(gp, ticks[0])), | |
612 | disk_stat_read(gp, ios[1]), disk_stat_read(gp, merges[1]), | |
613 | (unsigned long long)disk_stat_read(gp, sectors[1]), | |
614 | jiffies_to_msecs(disk_stat_read(gp, ticks[1])), | |
1da177e4 LT |
615 | gp->in_flight, |
616 | jiffies_to_msecs(disk_stat_read(gp, io_ticks)), | |
617 | jiffies_to_msecs(disk_stat_read(gp, time_in_queue))); | |
618 | ||
619 | /* now show all non-0 size partitions of it */ | |
620 | for (n = 0; n < gp->minors - 1; n++) { | |
621 | struct hd_struct *hd = gp->part[n]; | |
622 | ||
28f39d55 JM |
623 | if (!hd || !hd->nr_sects) |
624 | continue; | |
625 | ||
626 | preempt_disable(); | |
627 | part_round_stats(hd); | |
628 | preempt_enable(); | |
629 | seq_printf(s, "%4d %4d %s %lu %lu %llu " | |
630 | "%u %lu %lu %llu %u %u %u %u\n", | |
631 | gp->major, n + gp->first_minor + 1, | |
632 | disk_name(gp, n + 1, buf), | |
633 | part_stat_read(hd, ios[0]), | |
634 | part_stat_read(hd, merges[0]), | |
635 | (unsigned long long)part_stat_read(hd, sectors[0]), | |
636 | jiffies_to_msecs(part_stat_read(hd, ticks[0])), | |
637 | part_stat_read(hd, ios[1]), | |
638 | part_stat_read(hd, merges[1]), | |
639 | (unsigned long long)part_stat_read(hd, sectors[1]), | |
640 | jiffies_to_msecs(part_stat_read(hd, ticks[1])), | |
641 | hd->in_flight, | |
642 | jiffies_to_msecs(part_stat_read(hd, io_ticks)), | |
643 | jiffies_to_msecs(part_stat_read(hd, time_in_queue)) | |
644 | ); | |
1da177e4 LT |
645 | } |
646 | ||
647 | return 0; | |
648 | } | |
649 | ||
12f32bb3 | 650 | const struct seq_operations diskstats_op = { |
1da177e4 LT |
651 | .start = diskstats_start, |
652 | .next = diskstats_next, | |
653 | .stop = diskstats_stop, | |
654 | .show = diskstats_show | |
655 | }; | |
656 | ||
8ce7ad7b KCA |
657 | static void media_change_notify_thread(struct work_struct *work) |
658 | { | |
659 | struct gendisk *gd = container_of(work, struct gendisk, async_notify); | |
660 | char event[] = "MEDIA_CHANGE=1"; | |
661 | char *envp[] = { event, NULL }; | |
662 | ||
663 | /* | |
664 | * set enviroment vars to indicate which event this is for | |
665 | * so that user space will know to go check the media status. | |
666 | */ | |
edfaa7c3 | 667 | kobject_uevent_env(&gd->dev.kobj, KOBJ_CHANGE, envp); |
8ce7ad7b KCA |
668 | put_device(gd->driverfs_dev); |
669 | } | |
670 | ||
1826eadf | 671 | #if 0 |
8ce7ad7b KCA |
672 | void genhd_media_change_notify(struct gendisk *disk) |
673 | { | |
674 | get_device(disk->driverfs_dev); | |
675 | schedule_work(&disk->async_notify); | |
676 | } | |
677 | EXPORT_SYMBOL_GPL(genhd_media_change_notify); | |
1826eadf | 678 | #endif /* 0 */ |
8ce7ad7b | 679 | |
a142be85 GKH |
680 | struct find_block { |
681 | const char *name; | |
682 | int part; | |
683 | }; | |
684 | ||
685 | static int match_id(struct device *dev, void *data) | |
686 | { | |
687 | struct find_block *find = data; | |
688 | ||
689 | if (dev->type != &disk_type) | |
690 | return 0; | |
691 | if (strcmp(dev->bus_id, find->name) == 0) { | |
692 | struct gendisk *disk = dev_to_disk(dev); | |
693 | if (find->part < disk->minors) | |
694 | return 1; | |
695 | } | |
696 | return 0; | |
697 | } | |
698 | ||
30f2f0eb | 699 | dev_t blk_lookup_devt(const char *name, int part) |
edfaa7c3 KS |
700 | { |
701 | struct device *dev; | |
702 | dev_t devt = MKDEV(0, 0); | |
a142be85 | 703 | struct find_block find; |
edfaa7c3 KS |
704 | |
705 | mutex_lock(&block_class_lock); | |
a142be85 GKH |
706 | find.name = name; |
707 | find.part = part; | |
708 | dev = class_find_device(&block_class, NULL, (void *)&find, match_id); | |
709 | if (dev) | |
710 | devt = MKDEV(MAJOR(dev->devt), | |
711 | MINOR(dev->devt) + part); | |
edfaa7c3 KS |
712 | mutex_unlock(&block_class_lock); |
713 | ||
714 | return devt; | |
715 | } | |
edfaa7c3 KS |
716 | EXPORT_SYMBOL(blk_lookup_devt); |
717 | ||
1da177e4 LT |
718 | struct gendisk *alloc_disk(int minors) |
719 | { | |
1946089a CL |
720 | return alloc_disk_node(minors, -1); |
721 | } | |
722 | ||
723 | struct gendisk *alloc_disk_node(int minors, int node_id) | |
724 | { | |
725 | struct gendisk *disk; | |
726 | ||
94f6030c CL |
727 | disk = kmalloc_node(sizeof(struct gendisk), |
728 | GFP_KERNEL | __GFP_ZERO, node_id); | |
1da177e4 | 729 | if (disk) { |
1da177e4 LT |
730 | if (!init_disk_stats(disk)) { |
731 | kfree(disk); | |
732 | return NULL; | |
733 | } | |
734 | if (minors > 1) { | |
735 | int size = (minors - 1) * sizeof(struct hd_struct *); | |
94f6030c CL |
736 | disk->part = kmalloc_node(size, |
737 | GFP_KERNEL | __GFP_ZERO, node_id); | |
1da177e4 | 738 | if (!disk->part) { |
c7674030 | 739 | free_disk_stats(disk); |
1da177e4 LT |
740 | kfree(disk); |
741 | return NULL; | |
742 | } | |
1da177e4 LT |
743 | } |
744 | disk->minors = minors; | |
1da177e4 | 745 | rand_initialize_disk(disk); |
edfaa7c3 KS |
746 | disk->dev.class = &block_class; |
747 | disk->dev.type = &disk_type; | |
748 | device_initialize(&disk->dev); | |
8ce7ad7b KCA |
749 | INIT_WORK(&disk->async_notify, |
750 | media_change_notify_thread); | |
1da177e4 LT |
751 | } |
752 | return disk; | |
753 | } | |
754 | ||
755 | EXPORT_SYMBOL(alloc_disk); | |
1946089a | 756 | EXPORT_SYMBOL(alloc_disk_node); |
1da177e4 LT |
757 | |
758 | struct kobject *get_disk(struct gendisk *disk) | |
759 | { | |
760 | struct module *owner; | |
761 | struct kobject *kobj; | |
762 | ||
763 | if (!disk->fops) | |
764 | return NULL; | |
765 | owner = disk->fops->owner; | |
766 | if (owner && !try_module_get(owner)) | |
767 | return NULL; | |
edfaa7c3 | 768 | kobj = kobject_get(&disk->dev.kobj); |
1da177e4 LT |
769 | if (kobj == NULL) { |
770 | module_put(owner); | |
771 | return NULL; | |
772 | } | |
773 | return kobj; | |
774 | ||
775 | } | |
776 | ||
777 | EXPORT_SYMBOL(get_disk); | |
778 | ||
779 | void put_disk(struct gendisk *disk) | |
780 | { | |
781 | if (disk) | |
edfaa7c3 | 782 | kobject_put(&disk->dev.kobj); |
1da177e4 LT |
783 | } |
784 | ||
785 | EXPORT_SYMBOL(put_disk); | |
786 | ||
787 | void set_device_ro(struct block_device *bdev, int flag) | |
788 | { | |
789 | if (bdev->bd_contains != bdev) | |
790 | bdev->bd_part->policy = flag; | |
791 | else | |
792 | bdev->bd_disk->policy = flag; | |
793 | } | |
794 | ||
795 | EXPORT_SYMBOL(set_device_ro); | |
796 | ||
797 | void set_disk_ro(struct gendisk *disk, int flag) | |
798 | { | |
799 | int i; | |
800 | disk->policy = flag; | |
801 | for (i = 0; i < disk->minors - 1; i++) | |
802 | if (disk->part[i]) disk->part[i]->policy = flag; | |
803 | } | |
804 | ||
805 | EXPORT_SYMBOL(set_disk_ro); | |
806 | ||
807 | int bdev_read_only(struct block_device *bdev) | |
808 | { | |
809 | if (!bdev) | |
810 | return 0; | |
811 | else if (bdev->bd_contains != bdev) | |
812 | return bdev->bd_part->policy; | |
813 | else | |
814 | return bdev->bd_disk->policy; | |
815 | } | |
816 | ||
817 | EXPORT_SYMBOL(bdev_read_only); | |
818 | ||
819 | int invalidate_partition(struct gendisk *disk, int index) | |
820 | { | |
821 | int res = 0; | |
822 | struct block_device *bdev = bdget_disk(disk, index); | |
823 | if (bdev) { | |
2ef41634 CH |
824 | fsync_bdev(bdev); |
825 | res = __invalidate_device(bdev); | |
1da177e4 LT |
826 | bdput(bdev); |
827 | } | |
828 | return res; | |
829 | } | |
830 | ||
831 | EXPORT_SYMBOL(invalidate_partition); |