blob: 457fdac4c17d98db97cebd0c6910e23f4f97399f [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * gendisk handling
3 */
4
Linus Torvalds1da177e2005-04-16 15:20:36 -07005#include <linux/module.h>
6#include <linux/fs.h>
7#include <linux/genhd.h>
8#include <linux/kernel.h>
9#include <linux/blkdev.h>
10#include <linux/init.h>
11#include <linux/spinlock.h>
12#include <linux/seq_file.h>
13#include <linux/slab.h>
14#include <linux/kmod.h>
15#include <linux/kobj_map.h>
Christoph Hellwig2ef41632005-05-05 16:15:59 -070016#include <linux/buffer_head.h>
Jes Sorensen58383af2006-02-06 14:12:43 -080017#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
Kay Sieversb9d9c822006-06-15 15:31:56 +020019struct subsystem block_subsys;
Jes Sorensen58383af2006-02-06 14:12:43 -080020static DEFINE_MUTEX(block_subsys_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
22/*
23 * Can be deleted altogether. Later.
24 *
25 */
26static struct blk_major_name {
27 struct blk_major_name *next;
28 int major;
29 char name[16];
Joe Korty68eef3b2006-03-31 02:30:32 -080030} *major_names[BLKDEV_MAJOR_HASH_SIZE];
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
32/* index in the above - for now: assume no multimajor ranges */
33static inline int major_to_index(int major)
34{
Joe Korty68eef3b2006-03-31 02:30:32 -080035 return major % BLKDEV_MAJOR_HASH_SIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -070036}
37
Joe Korty68eef3b2006-03-31 02:30:32 -080038#ifdef CONFIG_PROC_FS
Neil Horman7170be52006-01-14 13:20:38 -080039
Joe Korty68eef3b2006-03-31 02:30:32 -080040void blkdev_show(struct seq_file *f, off_t offset)
Neil Horman7170be52006-01-14 13:20:38 -080041{
Joe Korty68eef3b2006-03-31 02:30:32 -080042 struct blk_major_name *dp;
Neil Horman7170be52006-01-14 13:20:38 -080043
Joe Korty68eef3b2006-03-31 02:30:32 -080044 if (offset < BLKDEV_MAJOR_HASH_SIZE) {
45 mutex_lock(&block_subsys_lock);
46 for (dp = major_names[offset]; dp; dp = dp->next)
47 seq_printf(f, "%3d %s\n", dp->major, dp->name);
48 mutex_unlock(&block_subsys_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070050}
Neil Horman7170be52006-01-14 13:20:38 -080051
Joe Korty68eef3b2006-03-31 02:30:32 -080052#endif /* CONFIG_PROC_FS */
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
54int register_blkdev(unsigned int major, const char *name)
55{
56 struct blk_major_name **n, *p;
57 int index, ret = 0;
58
Jes Sorensen58383af2006-02-06 14:12:43 -080059 mutex_lock(&block_subsys_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
61 /* temporary */
62 if (major == 0) {
63 for (index = ARRAY_SIZE(major_names)-1; index > 0; index--) {
64 if (major_names[index] == NULL)
65 break;
66 }
67
68 if (index == 0) {
69 printk("register_blkdev: failed to get major for %s\n",
70 name);
71 ret = -EBUSY;
72 goto out;
73 }
74 major = index;
75 ret = major;
76 }
77
78 p = kmalloc(sizeof(struct blk_major_name), GFP_KERNEL);
79 if (p == NULL) {
80 ret = -ENOMEM;
81 goto out;
82 }
83
84 p->major = major;
85 strlcpy(p->name, name, sizeof(p->name));
86 p->next = NULL;
87 index = major_to_index(major);
88
89 for (n = &major_names[index]; *n; n = &(*n)->next) {
90 if ((*n)->major == major)
91 break;
92 }
93 if (!*n)
94 *n = p;
95 else
96 ret = -EBUSY;
97
98 if (ret < 0) {
99 printk("register_blkdev: cannot get major %d for %s\n",
100 major, name);
101 kfree(p);
102 }
103out:
Jes Sorensen58383af2006-02-06 14:12:43 -0800104 mutex_unlock(&block_subsys_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 return ret;
106}
107
108EXPORT_SYMBOL(register_blkdev);
109
110/* todo: make void - error printk here */
111int unregister_blkdev(unsigned int major, const char *name)
112{
113 struct blk_major_name **n;
114 struct blk_major_name *p = NULL;
115 int index = major_to_index(major);
116 int ret = 0;
117
Jes Sorensen58383af2006-02-06 14:12:43 -0800118 mutex_lock(&block_subsys_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 for (n = &major_names[index]; *n; n = &(*n)->next)
120 if ((*n)->major == major)
121 break;
122 if (!*n || strcmp((*n)->name, name))
123 ret = -EINVAL;
124 else {
125 p = *n;
126 *n = p->next;
127 }
Jes Sorensen58383af2006-02-06 14:12:43 -0800128 mutex_unlock(&block_subsys_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 kfree(p);
130
131 return ret;
132}
133
134EXPORT_SYMBOL(unregister_blkdev);
135
136static struct kobj_map *bdev_map;
137
138/*
139 * Register device numbers dev..(dev+range-1)
140 * range must be nonzero
141 * The hash chain is sorted on range, so that subranges can override.
142 */
143void blk_register_region(dev_t dev, unsigned long range, struct module *module,
144 struct kobject *(*probe)(dev_t, int *, void *),
145 int (*lock)(dev_t, void *), void *data)
146{
147 kobj_map(bdev_map, dev, range, module, probe, lock, data);
148}
149
150EXPORT_SYMBOL(blk_register_region);
151
152void blk_unregister_region(dev_t dev, unsigned long range)
153{
154 kobj_unmap(bdev_map, dev, range);
155}
156
157EXPORT_SYMBOL(blk_unregister_region);
158
159static struct kobject *exact_match(dev_t dev, int *part, void *data)
160{
161 struct gendisk *p = data;
162 return &p->kobj;
163}
164
165static int exact_lock(dev_t dev, void *data)
166{
167 struct gendisk *p = data;
168
169 if (!get_disk(p))
170 return -1;
171 return 0;
172}
173
174/**
175 * add_disk - add partitioning information to kernel list
176 * @disk: per-device partitioning information
177 *
178 * This function registers the partitioning information in @disk
179 * with the kernel.
180 */
181void add_disk(struct gendisk *disk)
182{
183 disk->flags |= GENHD_FL_UP;
184 blk_register_region(MKDEV(disk->major, disk->first_minor),
185 disk->minors, NULL, exact_match, exact_lock, disk);
186 register_disk(disk);
187 blk_register_queue(disk);
188}
189
190EXPORT_SYMBOL(add_disk);
191EXPORT_SYMBOL(del_gendisk); /* in partitions/check.c */
192
193void unlink_gendisk(struct gendisk *disk)
194{
195 blk_unregister_queue(disk);
196 blk_unregister_region(MKDEV(disk->major, disk->first_minor),
197 disk->minors);
198}
199
200#define to_disk(obj) container_of(obj,struct gendisk,kobj)
201
202/**
203 * get_gendisk - get partitioning information for a given device
204 * @dev: device to get partitioning information for
205 *
206 * This function gets the structure containing partitioning
207 * information for the given device @dev.
208 */
209struct gendisk *get_gendisk(dev_t dev, int *part)
210{
211 struct kobject *kobj = kobj_lookup(bdev_map, dev, part);
212 return kobj ? to_disk(kobj) : NULL;
213}
214
215#ifdef CONFIG_PROC_FS
216/* iterator */
217static void *part_start(struct seq_file *part, loff_t *pos)
218{
219 struct list_head *p;
220 loff_t l = *pos;
221
Jes Sorensen58383af2006-02-06 14:12:43 -0800222 mutex_lock(&block_subsys_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 list_for_each(p, &block_subsys.kset.list)
224 if (!l--)
225 return list_entry(p, struct gendisk, kobj.entry);
226 return NULL;
227}
228
229static void *part_next(struct seq_file *part, void *v, loff_t *pos)
230{
231 struct list_head *p = ((struct gendisk *)v)->kobj.entry.next;
232 ++*pos;
233 return p==&block_subsys.kset.list ? NULL :
234 list_entry(p, struct gendisk, kobj.entry);
235}
236
237static void part_stop(struct seq_file *part, void *v)
238{
Jes Sorensen58383af2006-02-06 14:12:43 -0800239 mutex_unlock(&block_subsys_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240}
241
242static int show_partition(struct seq_file *part, void *v)
243{
244 struct gendisk *sgp = v;
245 int n;
246 char buf[BDEVNAME_SIZE];
247
248 if (&sgp->kobj.entry == block_subsys.kset.list.next)
249 seq_puts(part, "major minor #blocks name\n\n");
250
251 /* Don't show non-partitionable removeable devices or empty devices */
252 if (!get_capacity(sgp) ||
253 (sgp->minors == 1 && (sgp->flags & GENHD_FL_REMOVABLE)))
254 return 0;
255 if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO)
256 return 0;
257
258 /* show the full disk and all non-0 size partitions of it */
259 seq_printf(part, "%4d %4d %10llu %s\n",
260 sgp->major, sgp->first_minor,
261 (unsigned long long)get_capacity(sgp) >> 1,
262 disk_name(sgp, 0, buf));
263 for (n = 0; n < sgp->minors - 1; n++) {
264 if (!sgp->part[n])
265 continue;
266 if (sgp->part[n]->nr_sects == 0)
267 continue;
268 seq_printf(part, "%4d %4d %10llu %s\n",
269 sgp->major, n + 1 + sgp->first_minor,
270 (unsigned long long)sgp->part[n]->nr_sects >> 1 ,
271 disk_name(sgp, n + 1, buf));
272 }
273
274 return 0;
275}
276
277struct seq_operations partitions_op = {
278 .start =part_start,
279 .next = part_next,
280 .stop = part_stop,
281 .show = show_partition
282};
283#endif
284
285
286extern int blk_dev_init(void);
287
288static struct kobject *base_probe(dev_t dev, int *part, void *data)
289{
290 if (request_module("block-major-%d-%d", MAJOR(dev), MINOR(dev)) > 0)
291 /* Make old-style 2.4 aliases work */
292 request_module("block-major-%d", MAJOR(dev));
293 return NULL;
294}
295
296static int __init genhd_device_init(void)
297{
Randy Dunlap87a57262006-09-29 01:58:56 -0700298 int err;
299
Jes Sorensen58383af2006-02-06 14:12:43 -0800300 bdev_map = kobj_map_init(base_probe, &block_subsys_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 blk_dev_init();
Randy Dunlap87a57262006-09-29 01:58:56 -0700302 err = subsystem_register(&block_subsys);
303 if (err < 0)
304 printk(KERN_WARNING "%s: subsystem_register error: %d\n",
305 __FUNCTION__, err);
306 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307}
308
309subsys_initcall(genhd_device_init);
310
311
312
313/*
314 * kobject & sysfs bindings for block devices
315 */
316static ssize_t disk_attr_show(struct kobject *kobj, struct attribute *attr,
317 char *page)
318{
319 struct gendisk *disk = to_disk(kobj);
320 struct disk_attribute *disk_attr =
321 container_of(attr,struct disk_attribute,attr);
Dmitry Torokhov6c1852a2005-04-29 01:26:06 -0500322 ssize_t ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
324 if (disk_attr->show)
325 ret = disk_attr->show(disk,page);
326 return ret;
327}
328
Kay Sieversa7fd6702005-10-01 14:49:43 +0200329static ssize_t disk_attr_store(struct kobject * kobj, struct attribute * attr,
330 const char *page, size_t count)
331{
332 struct gendisk *disk = to_disk(kobj);
333 struct disk_attribute *disk_attr =
334 container_of(attr,struct disk_attribute,attr);
335 ssize_t ret = 0;
336
337 if (disk_attr->store)
338 ret = disk_attr->store(disk, page, count);
339 return ret;
340}
341
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342static struct sysfs_ops disk_sysfs_ops = {
343 .show = &disk_attr_show,
Kay Sieversa7fd6702005-10-01 14:49:43 +0200344 .store = &disk_attr_store,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345};
346
Kay Sieversa7fd6702005-10-01 14:49:43 +0200347static ssize_t disk_uevent_store(struct gendisk * disk,
348 const char *buf, size_t count)
349{
Kay Sievers312c0042005-11-16 09:00:00 +0100350 kobject_uevent(&disk->kobj, KOBJ_ADD);
Kay Sieversa7fd6702005-10-01 14:49:43 +0200351 return count;
352}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353static ssize_t disk_dev_read(struct gendisk * disk, char *page)
354{
355 dev_t base = MKDEV(disk->major, disk->first_minor);
356 return print_dev_t(page, base);
357}
358static ssize_t disk_range_read(struct gendisk * disk, char *page)
359{
360 return sprintf(page, "%d\n", disk->minors);
361}
362static ssize_t disk_removable_read(struct gendisk * disk, char *page)
363{
364 return sprintf(page, "%d\n",
365 (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0));
366
367}
368static ssize_t disk_size_read(struct gendisk * disk, char *page)
369{
370 return sprintf(page, "%llu\n", (unsigned long long)get_capacity(disk));
371}
372
373static ssize_t disk_stats_read(struct gendisk * disk, char *page)
374{
375 preempt_disable();
376 disk_round_stats(disk);
377 preempt_enable();
378 return sprintf(page,
Ben Woodard837c7872006-03-22 08:09:31 +0100379 "%8lu %8lu %8llu %8u "
380 "%8lu %8lu %8llu %8u "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 "%8u %8u %8u"
382 "\n",
Jens Axboe47a00412005-11-09 13:38:47 +0100383 disk_stat_read(disk, ios[READ]),
384 disk_stat_read(disk, merges[READ]),
385 (unsigned long long)disk_stat_read(disk, sectors[READ]),
386 jiffies_to_msecs(disk_stat_read(disk, ticks[READ])),
387 disk_stat_read(disk, ios[WRITE]),
388 disk_stat_read(disk, merges[WRITE]),
389 (unsigned long long)disk_stat_read(disk, sectors[WRITE]),
390 jiffies_to_msecs(disk_stat_read(disk, ticks[WRITE])),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 disk->in_flight,
392 jiffies_to_msecs(disk_stat_read(disk, io_ticks)),
393 jiffies_to_msecs(disk_stat_read(disk, time_in_queue)));
394}
Kay Sieversa7fd6702005-10-01 14:49:43 +0200395static struct disk_attribute disk_attr_uevent = {
396 .attr = {.name = "uevent", .mode = S_IWUSR },
397 .store = disk_uevent_store
398};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399static struct disk_attribute disk_attr_dev = {
400 .attr = {.name = "dev", .mode = S_IRUGO },
401 .show = disk_dev_read
402};
403static struct disk_attribute disk_attr_range = {
404 .attr = {.name = "range", .mode = S_IRUGO },
405 .show = disk_range_read
406};
407static struct disk_attribute disk_attr_removable = {
408 .attr = {.name = "removable", .mode = S_IRUGO },
409 .show = disk_removable_read
410};
411static struct disk_attribute disk_attr_size = {
412 .attr = {.name = "size", .mode = S_IRUGO },
413 .show = disk_size_read
414};
415static struct disk_attribute disk_attr_stat = {
416 .attr = {.name = "stat", .mode = S_IRUGO },
417 .show = disk_stats_read
418};
419
Akinobu Mitac17bb492006-12-08 02:39:46 -0800420#ifdef CONFIG_FAIL_MAKE_REQUEST
421
422static ssize_t disk_fail_store(struct gendisk * disk,
423 const char *buf, size_t count)
424{
425 int i;
426
427 if (count > 0 && sscanf(buf, "%d", &i) > 0) {
428 if (i == 0)
429 disk->flags &= ~GENHD_FL_FAIL;
430 else
431 disk->flags |= GENHD_FL_FAIL;
432 }
433
434 return count;
435}
436static ssize_t disk_fail_read(struct gendisk * disk, char *page)
437{
438 return sprintf(page, "%d\n", disk->flags & GENHD_FL_FAIL ? 1 : 0);
439}
440static struct disk_attribute disk_attr_fail = {
441 .attr = {.name = "make-it-fail", .mode = S_IRUGO | S_IWUSR },
442 .store = disk_fail_store,
443 .show = disk_fail_read
444};
445
446#endif
447
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448static struct attribute * default_attrs[] = {
Kay Sieversa7fd6702005-10-01 14:49:43 +0200449 &disk_attr_uevent.attr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 &disk_attr_dev.attr,
451 &disk_attr_range.attr,
452 &disk_attr_removable.attr,
453 &disk_attr_size.attr,
454 &disk_attr_stat.attr,
Akinobu Mitac17bb492006-12-08 02:39:46 -0800455#ifdef CONFIG_FAIL_MAKE_REQUEST
456 &disk_attr_fail.attr,
457#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 NULL,
459};
460
461static void disk_release(struct kobject * kobj)
462{
463 struct gendisk *disk = to_disk(kobj);
464 kfree(disk->random);
465 kfree(disk->part);
466 free_disk_stats(disk);
467 kfree(disk);
468}
469
470static struct kobj_type ktype_block = {
471 .release = disk_release,
472 .sysfs_ops = &disk_sysfs_ops,
473 .default_attrs = default_attrs,
474};
475
476extern struct kobj_type ktype_part;
477
Kay Sievers312c0042005-11-16 09:00:00 +0100478static int block_uevent_filter(struct kset *kset, struct kobject *kobj)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479{
480 struct kobj_type *ktype = get_ktype(kobj);
481
482 return ((ktype == &ktype_block) || (ktype == &ktype_part));
483}
484
Kay Sievers312c0042005-11-16 09:00:00 +0100485static int block_uevent(struct kset *kset, struct kobject *kobj, char **envp,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 int num_envp, char *buffer, int buffer_size)
487{
488 struct kobj_type *ktype = get_ktype(kobj);
489 struct device *physdev;
490 struct gendisk *disk;
491 struct hd_struct *part;
492 int length = 0;
493 int i = 0;
494
495 if (ktype == &ktype_block) {
496 disk = container_of(kobj, struct gendisk, kobj);
Kay Sievers312c0042005-11-16 09:00:00 +0100497 add_uevent_var(envp, num_envp, &i, buffer, buffer_size,
498 &length, "MINOR=%u", disk->first_minor);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 } else if (ktype == &ktype_part) {
500 disk = container_of(kobj->parent, struct gendisk, kobj);
501 part = container_of(kobj, struct hd_struct, kobj);
Kay Sievers312c0042005-11-16 09:00:00 +0100502 add_uevent_var(envp, num_envp, &i, buffer, buffer_size,
503 &length, "MINOR=%u",
504 disk->first_minor + part->partno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 } else
506 return 0;
507
Kay Sievers312c0042005-11-16 09:00:00 +0100508 add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
509 "MAJOR=%u", disk->major);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510
511 /* add physical device, backing this device */
512 physdev = disk->driverfs_dev;
513 if (physdev) {
514 char *path = kobject_get_path(&physdev->kobj, GFP_KERNEL);
515
Kay Sievers312c0042005-11-16 09:00:00 +0100516 add_uevent_var(envp, num_envp, &i, buffer, buffer_size,
517 &length, "PHYSDEVPATH=%s", path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 kfree(path);
519
520 if (physdev->bus)
Kay Sievers312c0042005-11-16 09:00:00 +0100521 add_uevent_var(envp, num_envp, &i,
522 buffer, buffer_size, &length,
523 "PHYSDEVBUS=%s",
524 physdev->bus->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525
526 if (physdev->driver)
Kay Sievers312c0042005-11-16 09:00:00 +0100527 add_uevent_var(envp, num_envp, &i,
528 buffer, buffer_size, &length,
529 "PHYSDEVDRIVER=%s",
530 physdev->driver->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 }
532
533 /* terminate, set to next free slot, shrink available space */
534 envp[i] = NULL;
535 envp = &envp[i];
536 num_envp -= i;
537 buffer = &buffer[length];
538 buffer_size -= length;
539
540 return 0;
541}
542
Kay Sievers312c0042005-11-16 09:00:00 +0100543static struct kset_uevent_ops block_uevent_ops = {
544 .filter = block_uevent_filter,
545 .uevent = block_uevent,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546};
547
Kay Sieversb9d9c822006-06-15 15:31:56 +0200548decl_subsys(block, &ktype_block, &block_uevent_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549
550/*
551 * aggregate disk stat collector. Uses the same stats that the sysfs
552 * entries do, above, but makes them available through one seq_file.
553 * Watching a few disks may be efficient through sysfs, but watching
554 * all of them will be more efficient through this interface.
555 *
556 * The output looks suspiciously like /proc/partitions with a bunch of
557 * extra fields.
558 */
559
560/* iterator */
561static void *diskstats_start(struct seq_file *part, loff_t *pos)
562{
563 loff_t k = *pos;
564 struct list_head *p;
565
Jes Sorensen58383af2006-02-06 14:12:43 -0800566 mutex_lock(&block_subsys_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 list_for_each(p, &block_subsys.kset.list)
568 if (!k--)
569 return list_entry(p, struct gendisk, kobj.entry);
570 return NULL;
571}
572
573static void *diskstats_next(struct seq_file *part, void *v, loff_t *pos)
574{
575 struct list_head *p = ((struct gendisk *)v)->kobj.entry.next;
576 ++*pos;
577 return p==&block_subsys.kset.list ? NULL :
578 list_entry(p, struct gendisk, kobj.entry);
579}
580
581static void diskstats_stop(struct seq_file *part, void *v)
582{
Jes Sorensen58383af2006-02-06 14:12:43 -0800583 mutex_unlock(&block_subsys_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584}
585
586static int diskstats_show(struct seq_file *s, void *v)
587{
588 struct gendisk *gp = v;
589 char buf[BDEVNAME_SIZE];
590 int n = 0;
591
592 /*
593 if (&sgp->kobj.entry == block_subsys.kset.list.next)
594 seq_puts(s, "major minor name"
595 " rio rmerge rsect ruse wio wmerge "
596 "wsect wuse running use aveq"
597 "\n\n");
598 */
599
600 preempt_disable();
601 disk_round_stats(gp);
602 preempt_enable();
Ben Woodard837c7872006-03-22 08:09:31 +0100603 seq_printf(s, "%4d %4d %s %lu %lu %llu %u %lu %lu %llu %u %u %u %u\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 gp->major, n + gp->first_minor, disk_name(gp, n, buf),
Jens Axboea3623572005-11-01 09:26:16 +0100605 disk_stat_read(gp, ios[0]), disk_stat_read(gp, merges[0]),
606 (unsigned long long)disk_stat_read(gp, sectors[0]),
607 jiffies_to_msecs(disk_stat_read(gp, ticks[0])),
608 disk_stat_read(gp, ios[1]), disk_stat_read(gp, merges[1]),
609 (unsigned long long)disk_stat_read(gp, sectors[1]),
610 jiffies_to_msecs(disk_stat_read(gp, ticks[1])),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 gp->in_flight,
612 jiffies_to_msecs(disk_stat_read(gp, io_ticks)),
613 jiffies_to_msecs(disk_stat_read(gp, time_in_queue)));
614
615 /* now show all non-0 size partitions of it */
616 for (n = 0; n < gp->minors - 1; n++) {
617 struct hd_struct *hd = gp->part[n];
618
619 if (hd && hd->nr_sects)
620 seq_printf(s, "%4d %4d %s %u %u %u %u\n",
621 gp->major, n + gp->first_minor + 1,
622 disk_name(gp, n + 1, buf),
Jens Axboea3623572005-11-01 09:26:16 +0100623 hd->ios[0], hd->sectors[0],
624 hd->ios[1], hd->sectors[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 }
626
627 return 0;
628}
629
630struct seq_operations diskstats_op = {
631 .start = diskstats_start,
632 .next = diskstats_next,
633 .stop = diskstats_stop,
634 .show = diskstats_show
635};
636
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637struct gendisk *alloc_disk(int minors)
638{
Christoph Lameter19460892005-06-23 00:08:19 -0700639 return alloc_disk_node(minors, -1);
640}
641
642struct gendisk *alloc_disk_node(int minors, int node_id)
643{
644 struct gendisk *disk;
645
646 disk = kmalloc_node(sizeof(struct gendisk), GFP_KERNEL, node_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 if (disk) {
648 memset(disk, 0, sizeof(struct gendisk));
649 if (!init_disk_stats(disk)) {
650 kfree(disk);
651 return NULL;
652 }
653 if (minors > 1) {
654 int size = (minors - 1) * sizeof(struct hd_struct *);
Christoph Lameter19460892005-06-23 00:08:19 -0700655 disk->part = kmalloc_node(size, GFP_KERNEL, node_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 if (!disk->part) {
657 kfree(disk);
658 return NULL;
659 }
660 memset(disk->part, 0, size);
661 }
662 disk->minors = minors;
663 kobj_set_kset_s(disk,block_subsys);
664 kobject_init(&disk->kobj);
665 rand_initialize_disk(disk);
666 }
667 return disk;
668}
669
670EXPORT_SYMBOL(alloc_disk);
Christoph Lameter19460892005-06-23 00:08:19 -0700671EXPORT_SYMBOL(alloc_disk_node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672
673struct kobject *get_disk(struct gendisk *disk)
674{
675 struct module *owner;
676 struct kobject *kobj;
677
678 if (!disk->fops)
679 return NULL;
680 owner = disk->fops->owner;
681 if (owner && !try_module_get(owner))
682 return NULL;
683 kobj = kobject_get(&disk->kobj);
684 if (kobj == NULL) {
685 module_put(owner);
686 return NULL;
687 }
688 return kobj;
689
690}
691
692EXPORT_SYMBOL(get_disk);
693
694void put_disk(struct gendisk *disk)
695{
696 if (disk)
697 kobject_put(&disk->kobj);
698}
699
700EXPORT_SYMBOL(put_disk);
701
702void set_device_ro(struct block_device *bdev, int flag)
703{
704 if (bdev->bd_contains != bdev)
705 bdev->bd_part->policy = flag;
706 else
707 bdev->bd_disk->policy = flag;
708}
709
710EXPORT_SYMBOL(set_device_ro);
711
712void set_disk_ro(struct gendisk *disk, int flag)
713{
714 int i;
715 disk->policy = flag;
716 for (i = 0; i < disk->minors - 1; i++)
717 if (disk->part[i]) disk->part[i]->policy = flag;
718}
719
720EXPORT_SYMBOL(set_disk_ro);
721
722int bdev_read_only(struct block_device *bdev)
723{
724 if (!bdev)
725 return 0;
726 else if (bdev->bd_contains != bdev)
727 return bdev->bd_part->policy;
728 else
729 return bdev->bd_disk->policy;
730}
731
732EXPORT_SYMBOL(bdev_read_only);
733
734int invalidate_partition(struct gendisk *disk, int index)
735{
736 int res = 0;
737 struct block_device *bdev = bdget_disk(disk, index);
738 if (bdev) {
Christoph Hellwig2ef41632005-05-05 16:15:59 -0700739 fsync_bdev(bdev);
740 res = __invalidate_device(bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 bdput(bdev);
742 }
743 return res;
744}
745
746EXPORT_SYMBOL(invalidate_partition);