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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); | |
cf0ca9fe PZ |
193 | |
194 | bdi = &disk->queue->backing_dev_info; | |
195 | bdi_register_dev(bdi, MKDEV(disk->major, disk->first_minor)); | |
6ffeea77 GKH |
196 | retval = sysfs_create_link(&disk->dev.kobj, &bdi->dev->kobj, "bdi"); |
197 | WARN_ON(retval); | |
1da177e4 LT |
198 | } |
199 | ||
200 | EXPORT_SYMBOL(add_disk); | |
201 | EXPORT_SYMBOL(del_gendisk); /* in partitions/check.c */ | |
202 | ||
203 | void unlink_gendisk(struct gendisk *disk) | |
204 | { | |
cf0ca9fe PZ |
205 | sysfs_remove_link(&disk->dev.kobj, "bdi"); |
206 | bdi_unregister(&disk->queue->backing_dev_info); | |
1da177e4 LT |
207 | blk_unregister_queue(disk); |
208 | blk_unregister_region(MKDEV(disk->major, disk->first_minor), | |
209 | disk->minors); | |
210 | } | |
211 | ||
1da177e4 LT |
212 | /** |
213 | * get_gendisk - get partitioning information for a given device | |
710027a4 RD |
214 | * @devt: device to get partitioning information for |
215 | * @part: returned partition index | |
1da177e4 LT |
216 | * |
217 | * This function gets the structure containing partitioning | |
710027a4 | 218 | * information for the given device @devt. |
1da177e4 | 219 | */ |
edfaa7c3 | 220 | struct gendisk *get_gendisk(dev_t devt, int *part) |
1da177e4 | 221 | { |
edfaa7c3 KS |
222 | struct kobject *kobj = kobj_lookup(bdev_map, devt, part); |
223 | struct device *dev = kobj_to_dev(kobj); | |
224 | ||
225 | return kobj ? dev_to_disk(dev) : NULL; | |
1da177e4 LT |
226 | } |
227 | ||
dd2a345f | 228 | /* |
5c6f35c5 GKH |
229 | * print a partitions - intended for places where the root filesystem can't be |
230 | * mounted and thus to give the victim some idea of what went wrong | |
dd2a345f | 231 | */ |
5c6f35c5 | 232 | static int printk_partition(struct device *dev, void *data) |
dd2a345f | 233 | { |
dd2a345f | 234 | struct gendisk *sgp; |
edfaa7c3 KS |
235 | char buf[BDEVNAME_SIZE]; |
236 | int n; | |
dd2a345f | 237 | |
5c6f35c5 | 238 | if (dev->type != &disk_type) |
ac65ece4 | 239 | return 0; |
5c6f35c5 GKH |
240 | |
241 | sgp = dev_to_disk(dev); | |
242 | /* | |
243 | * Don't show empty devices or things that have been surpressed | |
244 | */ | |
245 | if (get_capacity(sgp) == 0 || | |
246 | (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO)) | |
ac65ece4 | 247 | return 0; |
5c6f35c5 GKH |
248 | |
249 | /* | |
250 | * Note, unlike /proc/partitions, I am showing the numbers in | |
251 | * hex - the same format as the root= option takes. | |
252 | */ | |
253 | printk("%02x%02x %10llu %s", | |
254 | sgp->major, sgp->first_minor, | |
255 | (unsigned long long)get_capacity(sgp) >> 1, | |
256 | disk_name(sgp, 0, buf)); | |
257 | if (sgp->driverfs_dev != NULL && | |
258 | sgp->driverfs_dev->driver != NULL) | |
259 | printk(" driver: %s\n", | |
260 | sgp->driverfs_dev->driver->name); | |
261 | else | |
262 | printk(" (driver?)\n"); | |
263 | ||
264 | /* now show the partitions */ | |
265 | for (n = 0; n < sgp->minors - 1; ++n) { | |
266 | if (sgp->part[n] == NULL) | |
ac65ece4 | 267 | continue; |
5c6f35c5 | 268 | if (sgp->part[n]->nr_sects == 0) |
ac65ece4 | 269 | continue; |
5c6f35c5 GKH |
270 | printk(" %02x%02x %10llu %s\n", |
271 | sgp->major, n + 1 + sgp->first_minor, | |
272 | (unsigned long long)sgp->part[n]->nr_sects >> 1, | |
273 | disk_name(sgp, n + 1, buf)); | |
edfaa7c3 | 274 | } |
ac65ece4 | 275 | |
5c6f35c5 GKH |
276 | return 0; |
277 | } | |
dd2a345f | 278 | |
5c6f35c5 GKH |
279 | /* |
280 | * print a full list of all partitions - intended for places where the root | |
281 | * filesystem can't be mounted and thus to give the victim some idea of what | |
282 | * went wrong | |
283 | */ | |
284 | void __init printk_all_partitions(void) | |
285 | { | |
5c6f35c5 | 286 | class_for_each_device(&block_class, NULL, NULL, printk_partition); |
dd2a345f DG |
287 | } |
288 | ||
1da177e4 LT |
289 | #ifdef CONFIG_PROC_FS |
290 | /* iterator */ | |
68c4d4a7 GKH |
291 | static int find_start(struct device *dev, void *data) |
292 | { | |
068281d3 | 293 | loff_t *k = data; |
68c4d4a7 GKH |
294 | |
295 | if (dev->type != &disk_type) | |
296 | return 0; | |
068281d3 | 297 | if (!*k) |
68c4d4a7 | 298 | return 1; |
068281d3 | 299 | (*k)--; |
68c4d4a7 GKH |
300 | return 0; |
301 | } | |
302 | ||
1da177e4 LT |
303 | static void *part_start(struct seq_file *part, loff_t *pos) |
304 | { | |
edfaa7c3 | 305 | struct device *dev; |
2ac3cee5 | 306 | loff_t n = *pos; |
66c64afe | 307 | |
2ac3cee5 | 308 | if (!n) |
ddef43a8 | 309 | part->private = (void *)1LU; /* tell show to print header */ |
1da177e4 | 310 | |
2ac3cee5 TH |
311 | dev = class_find_device(&block_class, NULL, &n, find_start); |
312 | if (dev) | |
68c4d4a7 | 313 | return dev_to_disk(dev); |
2ac3cee5 | 314 | |
1da177e4 LT |
315 | return NULL; |
316 | } | |
317 | ||
27f30251 GKH |
318 | static int find_next(struct device *dev, void *data) |
319 | { | |
320 | if (dev->type == &disk_type) | |
321 | return 1; | |
322 | return 0; | |
323 | } | |
324 | ||
1da177e4 LT |
325 | static void *part_next(struct seq_file *part, void *v, loff_t *pos) |
326 | { | |
edfaa7c3 KS |
327 | struct gendisk *gp = v; |
328 | struct device *dev; | |
1da177e4 | 329 | ++*pos; |
27f30251 | 330 | dev = class_find_device(&block_class, &gp->dev, NULL, find_next); |
5c0ef6d0 KS |
331 | if (dev) { |
332 | put_device(dev); | |
27f30251 | 333 | return dev_to_disk(dev); |
5c0ef6d0 | 334 | } |
edfaa7c3 | 335 | return NULL; |
1da177e4 LT |
336 | } |
337 | ||
338 | static void part_stop(struct seq_file *part, void *v) | |
339 | { | |
1da177e4 LT |
340 | } |
341 | ||
342 | static int show_partition(struct seq_file *part, void *v) | |
343 | { | |
344 | struct gendisk *sgp = v; | |
345 | int n; | |
346 | char buf[BDEVNAME_SIZE]; | |
347 | ||
ddef43a8 TH |
348 | /* |
349 | * Print header if start told us to do. This is to preserve | |
350 | * the original behavior of not printing header if no | |
351 | * partition exists. This hackery will be removed later with | |
352 | * class iteration clean up. | |
353 | */ | |
354 | if (part->private) { | |
355 | seq_puts(part, "major minor #blocks name\n\n"); | |
356 | part->private = NULL; | |
357 | } | |
358 | ||
1da177e4 LT |
359 | /* Don't show non-partitionable removeable devices or empty devices */ |
360 | if (!get_capacity(sgp) || | |
361 | (sgp->minors == 1 && (sgp->flags & GENHD_FL_REMOVABLE))) | |
362 | return 0; | |
363 | if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO) | |
364 | return 0; | |
365 | ||
366 | /* show the full disk and all non-0 size partitions of it */ | |
367 | seq_printf(part, "%4d %4d %10llu %s\n", | |
368 | sgp->major, sgp->first_minor, | |
369 | (unsigned long long)get_capacity(sgp) >> 1, | |
370 | disk_name(sgp, 0, buf)); | |
371 | for (n = 0; n < sgp->minors - 1; n++) { | |
372 | if (!sgp->part[n]) | |
373 | continue; | |
374 | if (sgp->part[n]->nr_sects == 0) | |
375 | continue; | |
376 | seq_printf(part, "%4d %4d %10llu %s\n", | |
377 | sgp->major, n + 1 + sgp->first_minor, | |
378 | (unsigned long long)sgp->part[n]->nr_sects >> 1 , | |
379 | disk_name(sgp, n + 1, buf)); | |
380 | } | |
381 | ||
382 | return 0; | |
383 | } | |
384 | ||
12f32bb3 | 385 | const struct seq_operations partitions_op = { |
edfaa7c3 KS |
386 | .start = part_start, |
387 | .next = part_next, | |
388 | .stop = part_stop, | |
389 | .show = show_partition | |
1da177e4 LT |
390 | }; |
391 | #endif | |
392 | ||
393 | ||
edfaa7c3 | 394 | static struct kobject *base_probe(dev_t devt, int *part, void *data) |
1da177e4 | 395 | { |
edfaa7c3 | 396 | if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0) |
1da177e4 | 397 | /* Make old-style 2.4 aliases work */ |
edfaa7c3 | 398 | request_module("block-major-%d", MAJOR(devt)); |
1da177e4 LT |
399 | return NULL; |
400 | } | |
401 | ||
402 | static int __init genhd_device_init(void) | |
403 | { | |
e105b8bf DW |
404 | int error; |
405 | ||
406 | block_class.dev_kobj = sysfs_dev_block_kobj; | |
407 | error = class_register(&block_class); | |
ee27a558 RM |
408 | if (unlikely(error)) |
409 | return error; | |
edfaa7c3 | 410 | bdev_map = kobj_map_init(base_probe, &block_class_lock); |
1da177e4 | 411 | blk_dev_init(); |
edfaa7c3 KS |
412 | |
413 | #ifndef CONFIG_SYSFS_DEPRECATED | |
414 | /* create top-level block dir */ | |
415 | block_depr = kobject_create_and_add("block", NULL); | |
416 | #endif | |
830d3cfb | 417 | return 0; |
1da177e4 LT |
418 | } |
419 | ||
420 | subsys_initcall(genhd_device_init); | |
421 | ||
edfaa7c3 KS |
422 | static ssize_t disk_range_show(struct device *dev, |
423 | struct device_attribute *attr, char *buf) | |
1da177e4 | 424 | { |
edfaa7c3 | 425 | struct gendisk *disk = dev_to_disk(dev); |
1da177e4 | 426 | |
edfaa7c3 | 427 | return sprintf(buf, "%d\n", disk->minors); |
1da177e4 LT |
428 | } |
429 | ||
edfaa7c3 KS |
430 | static ssize_t disk_removable_show(struct device *dev, |
431 | struct device_attribute *attr, char *buf) | |
a7fd6706 | 432 | { |
edfaa7c3 | 433 | struct gendisk *disk = dev_to_disk(dev); |
a7fd6706 | 434 | |
edfaa7c3 KS |
435 | return sprintf(buf, "%d\n", |
436 | (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); | |
a7fd6706 KS |
437 | } |
438 | ||
1c9ce527 KS |
439 | static ssize_t disk_ro_show(struct device *dev, |
440 | struct device_attribute *attr, char *buf) | |
441 | { | |
442 | struct gendisk *disk = dev_to_disk(dev); | |
443 | ||
444 | return sprintf(buf, "%d\n", disk->policy ? 1 : 0); | |
445 | } | |
446 | ||
edfaa7c3 KS |
447 | static ssize_t disk_size_show(struct device *dev, |
448 | struct device_attribute *attr, char *buf) | |
a7fd6706 | 449 | { |
edfaa7c3 | 450 | struct gendisk *disk = dev_to_disk(dev); |
1da177e4 | 451 | |
edfaa7c3 | 452 | return sprintf(buf, "%llu\n", (unsigned long long)get_capacity(disk)); |
1da177e4 | 453 | } |
edfaa7c3 KS |
454 | |
455 | static ssize_t disk_capability_show(struct device *dev, | |
456 | struct device_attribute *attr, char *buf) | |
86ce18d7 | 457 | { |
edfaa7c3 KS |
458 | struct gendisk *disk = dev_to_disk(dev); |
459 | ||
460 | return sprintf(buf, "%x\n", disk->flags); | |
86ce18d7 | 461 | } |
edfaa7c3 KS |
462 | |
463 | static ssize_t disk_stat_show(struct device *dev, | |
464 | struct device_attribute *attr, char *buf) | |
1da177e4 | 465 | { |
edfaa7c3 KS |
466 | struct gendisk *disk = dev_to_disk(dev); |
467 | ||
1da177e4 LT |
468 | preempt_disable(); |
469 | disk_round_stats(disk); | |
470 | preempt_enable(); | |
edfaa7c3 | 471 | return sprintf(buf, |
837c7878 BW |
472 | "%8lu %8lu %8llu %8u " |
473 | "%8lu %8lu %8llu %8u " | |
1da177e4 LT |
474 | "%8u %8u %8u" |
475 | "\n", | |
47a00410 JA |
476 | disk_stat_read(disk, ios[READ]), |
477 | disk_stat_read(disk, merges[READ]), | |
478 | (unsigned long long)disk_stat_read(disk, sectors[READ]), | |
479 | jiffies_to_msecs(disk_stat_read(disk, ticks[READ])), | |
480 | disk_stat_read(disk, ios[WRITE]), | |
481 | disk_stat_read(disk, merges[WRITE]), | |
482 | (unsigned long long)disk_stat_read(disk, sectors[WRITE]), | |
483 | jiffies_to_msecs(disk_stat_read(disk, ticks[WRITE])), | |
1da177e4 LT |
484 | disk->in_flight, |
485 | jiffies_to_msecs(disk_stat_read(disk, io_ticks)), | |
486 | jiffies_to_msecs(disk_stat_read(disk, time_in_queue))); | |
487 | } | |
1da177e4 | 488 | |
c17bb495 | 489 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 KS |
490 | static ssize_t disk_fail_show(struct device *dev, |
491 | struct device_attribute *attr, char *buf) | |
492 | { | |
493 | struct gendisk *disk = dev_to_disk(dev); | |
494 | ||
495 | return sprintf(buf, "%d\n", disk->flags & GENHD_FL_FAIL ? 1 : 0); | |
496 | } | |
c17bb495 | 497 | |
edfaa7c3 KS |
498 | static ssize_t disk_fail_store(struct device *dev, |
499 | struct device_attribute *attr, | |
c17bb495 AM |
500 | const char *buf, size_t count) |
501 | { | |
edfaa7c3 | 502 | struct gendisk *disk = dev_to_disk(dev); |
c17bb495 AM |
503 | int i; |
504 | ||
505 | if (count > 0 && sscanf(buf, "%d", &i) > 0) { | |
506 | if (i == 0) | |
507 | disk->flags &= ~GENHD_FL_FAIL; | |
508 | else | |
509 | disk->flags |= GENHD_FL_FAIL; | |
510 | } | |
511 | ||
512 | return count; | |
513 | } | |
c17bb495 AM |
514 | |
515 | #endif | |
516 | ||
edfaa7c3 KS |
517 | static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL); |
518 | static DEVICE_ATTR(removable, S_IRUGO, disk_removable_show, NULL); | |
1c9ce527 | 519 | static DEVICE_ATTR(ro, S_IRUGO, disk_ro_show, NULL); |
edfaa7c3 KS |
520 | static DEVICE_ATTR(size, S_IRUGO, disk_size_show, NULL); |
521 | static DEVICE_ATTR(capability, S_IRUGO, disk_capability_show, NULL); | |
522 | static DEVICE_ATTR(stat, S_IRUGO, disk_stat_show, NULL); | |
c17bb495 | 523 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c3 KS |
524 | static struct device_attribute dev_attr_fail = |
525 | __ATTR(make-it-fail, S_IRUGO|S_IWUSR, disk_fail_show, disk_fail_store); | |
c17bb495 | 526 | #endif |
edfaa7c3 KS |
527 | |
528 | static struct attribute *disk_attrs[] = { | |
529 | &dev_attr_range.attr, | |
530 | &dev_attr_removable.attr, | |
1c9ce527 | 531 | &dev_attr_ro.attr, |
edfaa7c3 KS |
532 | &dev_attr_size.attr, |
533 | &dev_attr_capability.attr, | |
534 | &dev_attr_stat.attr, | |
535 | #ifdef CONFIG_FAIL_MAKE_REQUEST | |
536 | &dev_attr_fail.attr, | |
537 | #endif | |
538 | NULL | |
539 | }; | |
540 | ||
541 | static struct attribute_group disk_attr_group = { | |
542 | .attrs = disk_attrs, | |
543 | }; | |
544 | ||
545 | static struct attribute_group *disk_attr_groups[] = { | |
546 | &disk_attr_group, | |
547 | NULL | |
1da177e4 LT |
548 | }; |
549 | ||
edfaa7c3 | 550 | static void disk_release(struct device *dev) |
1da177e4 | 551 | { |
edfaa7c3 KS |
552 | struct gendisk *disk = dev_to_disk(dev); |
553 | ||
1da177e4 LT |
554 | kfree(disk->random); |
555 | kfree(disk->part); | |
556 | free_disk_stats(disk); | |
557 | kfree(disk); | |
558 | } | |
edfaa7c3 KS |
559 | struct class block_class = { |
560 | .name = "block", | |
1da177e4 LT |
561 | }; |
562 | ||
1826eadf | 563 | static struct device_type disk_type = { |
edfaa7c3 KS |
564 | .name = "disk", |
565 | .groups = disk_attr_groups, | |
566 | .release = disk_release, | |
1da177e4 LT |
567 | }; |
568 | ||
a6e2ba88 | 569 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
570 | /* |
571 | * aggregate disk stat collector. Uses the same stats that the sysfs | |
572 | * entries do, above, but makes them available through one seq_file. | |
1da177e4 LT |
573 | * |
574 | * The output looks suspiciously like /proc/partitions with a bunch of | |
575 | * extra fields. | |
576 | */ | |
577 | ||
1da177e4 LT |
578 | static void *diskstats_start(struct seq_file *part, loff_t *pos) |
579 | { | |
edfaa7c3 | 580 | struct device *dev; |
2ac3cee5 | 581 | loff_t n = *pos; |
1da177e4 | 582 | |
2ac3cee5 TH |
583 | dev = class_find_device(&block_class, NULL, &n, find_start); |
584 | if (dev) | |
68c4d4a7 | 585 | return dev_to_disk(dev); |
2ac3cee5 | 586 | |
1da177e4 LT |
587 | return NULL; |
588 | } | |
589 | ||
590 | static void *diskstats_next(struct seq_file *part, void *v, loff_t *pos) | |
591 | { | |
edfaa7c3 KS |
592 | struct gendisk *gp = v; |
593 | struct device *dev; | |
594 | ||
1da177e4 | 595 | ++*pos; |
27f30251 | 596 | dev = class_find_device(&block_class, &gp->dev, NULL, find_next); |
5c0ef6d0 KS |
597 | if (dev) { |
598 | put_device(dev); | |
27f30251 | 599 | return dev_to_disk(dev); |
5c0ef6d0 | 600 | } |
edfaa7c3 | 601 | return NULL; |
1da177e4 LT |
602 | } |
603 | ||
604 | static void diskstats_stop(struct seq_file *part, void *v) | |
605 | { | |
1da177e4 LT |
606 | } |
607 | ||
608 | static int diskstats_show(struct seq_file *s, void *v) | |
609 | { | |
610 | struct gendisk *gp = v; | |
611 | char buf[BDEVNAME_SIZE]; | |
612 | int n = 0; | |
613 | ||
614 | /* | |
edfaa7c3 | 615 | if (&gp->dev.kobj.entry == block_class.devices.next) |
1da177e4 LT |
616 | seq_puts(s, "major minor name" |
617 | " rio rmerge rsect ruse wio wmerge " | |
618 | "wsect wuse running use aveq" | |
619 | "\n\n"); | |
620 | */ | |
621 | ||
622 | preempt_disable(); | |
623 | disk_round_stats(gp); | |
624 | preempt_enable(); | |
837c7878 | 625 | seq_printf(s, "%4d %4d %s %lu %lu %llu %u %lu %lu %llu %u %u %u %u\n", |
1da177e4 | 626 | gp->major, n + gp->first_minor, disk_name(gp, n, buf), |
a362357b JA |
627 | disk_stat_read(gp, ios[0]), disk_stat_read(gp, merges[0]), |
628 | (unsigned long long)disk_stat_read(gp, sectors[0]), | |
629 | jiffies_to_msecs(disk_stat_read(gp, ticks[0])), | |
630 | disk_stat_read(gp, ios[1]), disk_stat_read(gp, merges[1]), | |
631 | (unsigned long long)disk_stat_read(gp, sectors[1]), | |
632 | jiffies_to_msecs(disk_stat_read(gp, ticks[1])), | |
1da177e4 LT |
633 | gp->in_flight, |
634 | jiffies_to_msecs(disk_stat_read(gp, io_ticks)), | |
635 | jiffies_to_msecs(disk_stat_read(gp, time_in_queue))); | |
636 | ||
637 | /* now show all non-0 size partitions of it */ | |
638 | for (n = 0; n < gp->minors - 1; n++) { | |
639 | struct hd_struct *hd = gp->part[n]; | |
640 | ||
28f39d55 JM |
641 | if (!hd || !hd->nr_sects) |
642 | continue; | |
643 | ||
644 | preempt_disable(); | |
645 | part_round_stats(hd); | |
646 | preempt_enable(); | |
647 | seq_printf(s, "%4d %4d %s %lu %lu %llu " | |
648 | "%u %lu %lu %llu %u %u %u %u\n", | |
649 | gp->major, n + gp->first_minor + 1, | |
650 | disk_name(gp, n + 1, buf), | |
651 | part_stat_read(hd, ios[0]), | |
652 | part_stat_read(hd, merges[0]), | |
653 | (unsigned long long)part_stat_read(hd, sectors[0]), | |
654 | jiffies_to_msecs(part_stat_read(hd, ticks[0])), | |
655 | part_stat_read(hd, ios[1]), | |
656 | part_stat_read(hd, merges[1]), | |
657 | (unsigned long long)part_stat_read(hd, sectors[1]), | |
658 | jiffies_to_msecs(part_stat_read(hd, ticks[1])), | |
659 | hd->in_flight, | |
660 | jiffies_to_msecs(part_stat_read(hd, io_ticks)), | |
661 | jiffies_to_msecs(part_stat_read(hd, time_in_queue)) | |
662 | ); | |
1da177e4 LT |
663 | } |
664 | ||
665 | return 0; | |
666 | } | |
667 | ||
12f32bb3 | 668 | const struct seq_operations diskstats_op = { |
1da177e4 LT |
669 | .start = diskstats_start, |
670 | .next = diskstats_next, | |
671 | .stop = diskstats_stop, | |
672 | .show = diskstats_show | |
673 | }; | |
a6e2ba88 | 674 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 675 | |
8ce7ad7b KCA |
676 | static void media_change_notify_thread(struct work_struct *work) |
677 | { | |
678 | struct gendisk *gd = container_of(work, struct gendisk, async_notify); | |
679 | char event[] = "MEDIA_CHANGE=1"; | |
680 | char *envp[] = { event, NULL }; | |
681 | ||
682 | /* | |
683 | * set enviroment vars to indicate which event this is for | |
684 | * so that user space will know to go check the media status. | |
685 | */ | |
edfaa7c3 | 686 | kobject_uevent_env(&gd->dev.kobj, KOBJ_CHANGE, envp); |
8ce7ad7b KCA |
687 | put_device(gd->driverfs_dev); |
688 | } | |
689 | ||
1826eadf | 690 | #if 0 |
8ce7ad7b KCA |
691 | void genhd_media_change_notify(struct gendisk *disk) |
692 | { | |
693 | get_device(disk->driverfs_dev); | |
694 | schedule_work(&disk->async_notify); | |
695 | } | |
696 | EXPORT_SYMBOL_GPL(genhd_media_change_notify); | |
1826eadf | 697 | #endif /* 0 */ |
8ce7ad7b | 698 | |
a142be85 GKH |
699 | struct find_block { |
700 | const char *name; | |
701 | int part; | |
702 | }; | |
703 | ||
704 | static int match_id(struct device *dev, void *data) | |
705 | { | |
706 | struct find_block *find = data; | |
707 | ||
708 | if (dev->type != &disk_type) | |
709 | return 0; | |
710 | if (strcmp(dev->bus_id, find->name) == 0) { | |
711 | struct gendisk *disk = dev_to_disk(dev); | |
712 | if (find->part < disk->minors) | |
713 | return 1; | |
714 | } | |
715 | return 0; | |
716 | } | |
717 | ||
30f2f0eb | 718 | dev_t blk_lookup_devt(const char *name, int part) |
edfaa7c3 KS |
719 | { |
720 | struct device *dev; | |
721 | dev_t devt = MKDEV(0, 0); | |
a142be85 | 722 | struct find_block find; |
edfaa7c3 | 723 | |
a142be85 GKH |
724 | find.name = name; |
725 | find.part = part; | |
5c0ef6d0 KS |
726 | dev = class_find_device(&block_class, NULL, &find, match_id); |
727 | if (dev) { | |
728 | put_device(dev); | |
a142be85 GKH |
729 | devt = MKDEV(MAJOR(dev->devt), |
730 | MINOR(dev->devt) + part); | |
5c0ef6d0 | 731 | } |
edfaa7c3 KS |
732 | |
733 | return devt; | |
734 | } | |
edfaa7c3 KS |
735 | EXPORT_SYMBOL(blk_lookup_devt); |
736 | ||
1da177e4 LT |
737 | struct gendisk *alloc_disk(int minors) |
738 | { | |
1946089a CL |
739 | return alloc_disk_node(minors, -1); |
740 | } | |
741 | ||
742 | struct gendisk *alloc_disk_node(int minors, int node_id) | |
743 | { | |
744 | struct gendisk *disk; | |
745 | ||
94f6030c CL |
746 | disk = kmalloc_node(sizeof(struct gendisk), |
747 | GFP_KERNEL | __GFP_ZERO, node_id); | |
1da177e4 | 748 | if (disk) { |
1da177e4 LT |
749 | if (!init_disk_stats(disk)) { |
750 | kfree(disk); | |
751 | return NULL; | |
752 | } | |
753 | if (minors > 1) { | |
754 | int size = (minors - 1) * sizeof(struct hd_struct *); | |
94f6030c CL |
755 | disk->part = kmalloc_node(size, |
756 | GFP_KERNEL | __GFP_ZERO, node_id); | |
1da177e4 | 757 | if (!disk->part) { |
c7674030 | 758 | free_disk_stats(disk); |
1da177e4 LT |
759 | kfree(disk); |
760 | return NULL; | |
761 | } | |
1da177e4 LT |
762 | } |
763 | disk->minors = minors; | |
1da177e4 | 764 | rand_initialize_disk(disk); |
edfaa7c3 KS |
765 | disk->dev.class = &block_class; |
766 | disk->dev.type = &disk_type; | |
767 | device_initialize(&disk->dev); | |
8ce7ad7b KCA |
768 | INIT_WORK(&disk->async_notify, |
769 | media_change_notify_thread); | |
1da177e4 LT |
770 | } |
771 | return disk; | |
772 | } | |
773 | ||
774 | EXPORT_SYMBOL(alloc_disk); | |
1946089a | 775 | EXPORT_SYMBOL(alloc_disk_node); |
1da177e4 LT |
776 | |
777 | struct kobject *get_disk(struct gendisk *disk) | |
778 | { | |
779 | struct module *owner; | |
780 | struct kobject *kobj; | |
781 | ||
782 | if (!disk->fops) | |
783 | return NULL; | |
784 | owner = disk->fops->owner; | |
785 | if (owner && !try_module_get(owner)) | |
786 | return NULL; | |
edfaa7c3 | 787 | kobj = kobject_get(&disk->dev.kobj); |
1da177e4 LT |
788 | if (kobj == NULL) { |
789 | module_put(owner); | |
790 | return NULL; | |
791 | } | |
792 | return kobj; | |
793 | ||
794 | } | |
795 | ||
796 | EXPORT_SYMBOL(get_disk); | |
797 | ||
798 | void put_disk(struct gendisk *disk) | |
799 | { | |
800 | if (disk) | |
edfaa7c3 | 801 | kobject_put(&disk->dev.kobj); |
1da177e4 LT |
802 | } |
803 | ||
804 | EXPORT_SYMBOL(put_disk); | |
805 | ||
806 | void set_device_ro(struct block_device *bdev, int flag) | |
807 | { | |
808 | if (bdev->bd_contains != bdev) | |
809 | bdev->bd_part->policy = flag; | |
810 | else | |
811 | bdev->bd_disk->policy = flag; | |
812 | } | |
813 | ||
814 | EXPORT_SYMBOL(set_device_ro); | |
815 | ||
816 | void set_disk_ro(struct gendisk *disk, int flag) | |
817 | { | |
818 | int i; | |
819 | disk->policy = flag; | |
820 | for (i = 0; i < disk->minors - 1; i++) | |
821 | if (disk->part[i]) disk->part[i]->policy = flag; | |
822 | } | |
823 | ||
824 | EXPORT_SYMBOL(set_disk_ro); | |
825 | ||
826 | int bdev_read_only(struct block_device *bdev) | |
827 | { | |
828 | if (!bdev) | |
829 | return 0; | |
830 | else if (bdev->bd_contains != bdev) | |
831 | return bdev->bd_part->policy; | |
832 | else | |
833 | return bdev->bd_disk->policy; | |
834 | } | |
835 | ||
836 | EXPORT_SYMBOL(bdev_read_only); | |
837 | ||
838 | int invalidate_partition(struct gendisk *disk, int index) | |
839 | { | |
840 | int res = 0; | |
841 | struct block_device *bdev = bdget_disk(disk, index); | |
842 | if (bdev) { | |
2ef41634 CH |
843 | fsync_bdev(bdev); |
844 | res = __invalidate_device(bdev); | |
1da177e4 LT |
845 | bdput(bdev); |
846 | } | |
847 | return res; | |
848 | } | |
849 | ||
850 | EXPORT_SYMBOL(invalidate_partition); |