5 #include <linux/module.h>
7 #include <linux/genhd.h>
8 #include <linux/kdev_t.h>
9 #include <linux/kernel.h>
10 #include <linux/blkdev.h>
11 #include <linux/init.h>
12 #include <linux/spinlock.h>
13 #include <linux/seq_file.h>
14 #include <linux/slab.h>
15 #include <linux/kmod.h>
16 #include <linux/kobj_map.h>
17 #include <linux/buffer_head.h>
18 #include <linux/mutex.h>
22 static DEFINE_MUTEX(block_class_lock
);
23 #ifndef CONFIG_SYSFS_DEPRECATED
24 struct kobject
*block_depr
;
27 static struct device_type disk_type
;
30 * Can be deleted altogether. Later.
33 static struct blk_major_name
{
34 struct blk_major_name
*next
;
37 } *major_names
[BLKDEV_MAJOR_HASH_SIZE
];
39 /* index in the above - for now: assume no multimajor ranges */
40 static inline int major_to_index(int major
)
42 return major
% BLKDEV_MAJOR_HASH_SIZE
;
46 void blkdev_show(struct seq_file
*f
, off_t offset
)
48 struct blk_major_name
*dp
;
50 if (offset
< BLKDEV_MAJOR_HASH_SIZE
) {
51 mutex_lock(&block_class_lock
);
52 for (dp
= major_names
[offset
]; dp
; dp
= dp
->next
)
53 seq_printf(f
, "%3d %s\n", dp
->major
, dp
->name
);
54 mutex_unlock(&block_class_lock
);
57 #endif /* CONFIG_PROC_FS */
59 int register_blkdev(unsigned int major
, const char *name
)
61 struct blk_major_name
**n
, *p
;
64 mutex_lock(&block_class_lock
);
68 for (index
= ARRAY_SIZE(major_names
)-1; index
> 0; index
--) {
69 if (major_names
[index
] == NULL
)
74 printk("register_blkdev: failed to get major for %s\n",
83 p
= kmalloc(sizeof(struct blk_major_name
), GFP_KERNEL
);
90 strlcpy(p
->name
, name
, sizeof(p
->name
));
92 index
= major_to_index(major
);
94 for (n
= &major_names
[index
]; *n
; n
= &(*n
)->next
) {
95 if ((*n
)->major
== major
)
104 printk("register_blkdev: cannot get major %d for %s\n",
109 mutex_unlock(&block_class_lock
);
113 EXPORT_SYMBOL(register_blkdev
);
115 void unregister_blkdev(unsigned int major
, const char *name
)
117 struct blk_major_name
**n
;
118 struct blk_major_name
*p
= NULL
;
119 int index
= major_to_index(major
);
121 mutex_lock(&block_class_lock
);
122 for (n
= &major_names
[index
]; *n
; n
= &(*n
)->next
)
123 if ((*n
)->major
== major
)
125 if (!*n
|| strcmp((*n
)->name
, name
)) {
131 mutex_unlock(&block_class_lock
);
135 EXPORT_SYMBOL(unregister_blkdev
);
137 static struct kobj_map
*bdev_map
;
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.
144 void blk_register_region(dev_t devt
, unsigned long range
, struct module
*module
,
145 struct kobject
*(*probe
)(dev_t
, int *, void *),
146 int (*lock
)(dev_t
, void *), void *data
)
148 kobj_map(bdev_map
, devt
, range
, module
, probe
, lock
, data
);
151 EXPORT_SYMBOL(blk_register_region
);
153 void blk_unregister_region(dev_t devt
, unsigned long range
)
155 kobj_unmap(bdev_map
, devt
, range
);
158 EXPORT_SYMBOL(blk_unregister_region
);
160 static struct kobject
*exact_match(dev_t devt
, int *part
, void *data
)
162 struct gendisk
*p
= data
;
167 static int exact_lock(dev_t devt
, void *data
)
169 struct gendisk
*p
= data
;
177 * add_disk - add partitioning information to kernel list
178 * @disk: per-device partitioning information
180 * This function registers the partitioning information in @disk
183 void add_disk(struct gendisk
*disk
)
185 disk
->flags
|= GENHD_FL_UP
;
186 blk_register_region(MKDEV(disk
->major
, disk
->first_minor
),
187 disk
->minors
, NULL
, exact_match
, exact_lock
, disk
);
189 blk_register_queue(disk
);
192 EXPORT_SYMBOL(add_disk
);
193 EXPORT_SYMBOL(del_gendisk
); /* in partitions/check.c */
195 void unlink_gendisk(struct gendisk
*disk
)
197 blk_unregister_queue(disk
);
198 blk_unregister_region(MKDEV(disk
->major
, disk
->first_minor
),
203 * get_gendisk - get partitioning information for a given device
204 * @dev: device to get partitioning information for
206 * This function gets the structure containing partitioning
207 * information for the given device @dev.
209 struct gendisk
*get_gendisk(dev_t devt
, int *part
)
211 struct kobject
*kobj
= kobj_lookup(bdev_map
, devt
, part
);
212 struct device
*dev
= kobj_to_dev(kobj
);
214 return kobj
? dev_to_disk(dev
) : NULL
;
218 * print a full list of all partitions - intended for places where the root
219 * filesystem can't be mounted and thus to give the victim some idea of what
222 void __init
printk_all_partitions(void)
226 char buf
[BDEVNAME_SIZE
];
229 mutex_lock(&block_class_lock
);
230 /* For each block device... */
231 list_for_each_entry(dev
, &block_class
.devices
, node
) {
232 if (dev
->type
!= &disk_type
)
234 sgp
= dev_to_disk(dev
);
236 * Don't show empty devices or things that have been surpressed
238 if (get_capacity(sgp
) == 0 ||
239 (sgp
->flags
& GENHD_FL_SUPPRESS_PARTITION_INFO
))
243 * Note, unlike /proc/partitions, I am showing the numbers in
244 * hex - the same format as the root= option takes.
246 printk("%02x%02x %10llu %s",
247 sgp
->major
, sgp
->first_minor
,
248 (unsigned long long)get_capacity(sgp
) >> 1,
249 disk_name(sgp
, 0, buf
));
250 if (sgp
->driverfs_dev
!= NULL
&&
251 sgp
->driverfs_dev
->driver
!= NULL
)
252 printk(" driver: %s\n",
253 sgp
->driverfs_dev
->driver
->name
);
255 printk(" (driver?)\n");
257 /* now show the partitions */
258 for (n
= 0; n
< sgp
->minors
- 1; ++n
) {
259 if (sgp
->part
[n
] == NULL
)
261 if (sgp
->part
[n
]->nr_sects
== 0)
263 printk(" %02x%02x %10llu %s\n",
264 sgp
->major
, n
+ 1 + sgp
->first_minor
,
265 (unsigned long long)sgp
->part
[n
]->nr_sects
>> 1,
266 disk_name(sgp
, n
+ 1, buf
));
270 mutex_unlock(&block_class_lock
);
273 #ifdef CONFIG_PROC_FS
275 static void *part_start(struct seq_file
*part
, loff_t
*pos
)
280 mutex_lock(&block_class_lock
);
281 list_for_each_entry(dev
, &block_class
.devices
, node
) {
282 if (dev
->type
!= &disk_type
)
285 return dev_to_disk(dev
);
290 static void *part_next(struct seq_file
*part
, void *v
, loff_t
*pos
)
292 struct gendisk
*gp
= v
;
295 list_for_each_entry(dev
, &gp
->dev
.node
, node
) {
296 if (&dev
->node
== &block_class
.devices
)
298 if (dev
->type
== &disk_type
)
299 return dev_to_disk(dev
);
304 static void part_stop(struct seq_file
*part
, void *v
)
306 mutex_unlock(&block_class_lock
);
309 static int show_partition(struct seq_file
*part
, void *v
)
311 struct gendisk
*sgp
= v
;
313 char buf
[BDEVNAME_SIZE
];
315 if (&sgp
->dev
.node
== block_class
.devices
.next
)
316 seq_puts(part
, "major minor #blocks name\n\n");
318 /* Don't show non-partitionable removeable devices or empty devices */
319 if (!get_capacity(sgp
) ||
320 (sgp
->minors
== 1 && (sgp
->flags
& GENHD_FL_REMOVABLE
)))
322 if (sgp
->flags
& GENHD_FL_SUPPRESS_PARTITION_INFO
)
325 /* show the full disk and all non-0 size partitions of it */
326 seq_printf(part
, "%4d %4d %10llu %s\n",
327 sgp
->major
, sgp
->first_minor
,
328 (unsigned long long)get_capacity(sgp
) >> 1,
329 disk_name(sgp
, 0, buf
));
330 for (n
= 0; n
< sgp
->minors
- 1; n
++) {
333 if (sgp
->part
[n
]->nr_sects
== 0)
335 seq_printf(part
, "%4d %4d %10llu %s\n",
336 sgp
->major
, n
+ 1 + sgp
->first_minor
,
337 (unsigned long long)sgp
->part
[n
]->nr_sects
>> 1 ,
338 disk_name(sgp
, n
+ 1, buf
));
344 const struct seq_operations partitions_op
= {
348 .show
= show_partition
353 static struct kobject
*base_probe(dev_t devt
, int *part
, void *data
)
355 if (request_module("block-major-%d-%d", MAJOR(devt
), MINOR(devt
)) > 0)
356 /* Make old-style 2.4 aliases work */
357 request_module("block-major-%d", MAJOR(devt
));
361 static int __init
genhd_device_init(void)
363 int error
= class_register(&block_class
);
366 bdev_map
= kobj_map_init(base_probe
, &block_class_lock
);
369 #ifndef CONFIG_SYSFS_DEPRECATED
370 /* create top-level block dir */
371 block_depr
= kobject_create_and_add("block", NULL
);
376 subsys_initcall(genhd_device_init
);
378 static ssize_t
disk_range_show(struct device
*dev
,
379 struct device_attribute
*attr
, char *buf
)
381 struct gendisk
*disk
= dev_to_disk(dev
);
383 return sprintf(buf
, "%d\n", disk
->minors
);
386 static ssize_t
disk_removable_show(struct device
*dev
,
387 struct device_attribute
*attr
, char *buf
)
389 struct gendisk
*disk
= dev_to_disk(dev
);
391 return sprintf(buf
, "%d\n",
392 (disk
->flags
& GENHD_FL_REMOVABLE
? 1 : 0));
395 static ssize_t
disk_size_show(struct device
*dev
,
396 struct device_attribute
*attr
, char *buf
)
398 struct gendisk
*disk
= dev_to_disk(dev
);
400 return sprintf(buf
, "%llu\n", (unsigned long long)get_capacity(disk
));
403 static ssize_t
disk_capability_show(struct device
*dev
,
404 struct device_attribute
*attr
, char *buf
)
406 struct gendisk
*disk
= dev_to_disk(dev
);
408 return sprintf(buf
, "%x\n", disk
->flags
);
411 static ssize_t
disk_stat_show(struct device
*dev
,
412 struct device_attribute
*attr
, char *buf
)
414 struct gendisk
*disk
= dev_to_disk(dev
);
417 disk_round_stats(disk
);
420 "%8lu %8lu %8llu %8u "
421 "%8lu %8lu %8llu %8u "
424 disk_stat_read(disk
, ios
[READ
]),
425 disk_stat_read(disk
, merges
[READ
]),
426 (unsigned long long)disk_stat_read(disk
, sectors
[READ
]),
427 jiffies_to_msecs(disk_stat_read(disk
, ticks
[READ
])),
428 disk_stat_read(disk
, ios
[WRITE
]),
429 disk_stat_read(disk
, merges
[WRITE
]),
430 (unsigned long long)disk_stat_read(disk
, sectors
[WRITE
]),
431 jiffies_to_msecs(disk_stat_read(disk
, ticks
[WRITE
])),
433 jiffies_to_msecs(disk_stat_read(disk
, io_ticks
)),
434 jiffies_to_msecs(disk_stat_read(disk
, time_in_queue
)));
437 #ifdef CONFIG_FAIL_MAKE_REQUEST
438 static ssize_t
disk_fail_show(struct device
*dev
,
439 struct device_attribute
*attr
, char *buf
)
441 struct gendisk
*disk
= dev_to_disk(dev
);
443 return sprintf(buf
, "%d\n", disk
->flags
& GENHD_FL_FAIL
? 1 : 0);
446 static ssize_t
disk_fail_store(struct device
*dev
,
447 struct device_attribute
*attr
,
448 const char *buf
, size_t count
)
450 struct gendisk
*disk
= dev_to_disk(dev
);
453 if (count
> 0 && sscanf(buf
, "%d", &i
) > 0) {
455 disk
->flags
&= ~GENHD_FL_FAIL
;
457 disk
->flags
|= GENHD_FL_FAIL
;
465 static DEVICE_ATTR(range
, S_IRUGO
, disk_range_show
, NULL
);
466 static DEVICE_ATTR(removable
, S_IRUGO
, disk_removable_show
, NULL
);
467 static DEVICE_ATTR(size
, S_IRUGO
, disk_size_show
, NULL
);
468 static DEVICE_ATTR(capability
, S_IRUGO
, disk_capability_show
, NULL
);
469 static DEVICE_ATTR(stat
, S_IRUGO
, disk_stat_show
, NULL
);
470 #ifdef CONFIG_FAIL_MAKE_REQUEST
471 static struct device_attribute dev_attr_fail
=
472 __ATTR(make
-it
-fail
, S_IRUGO
|S_IWUSR
, disk_fail_show
, disk_fail_store
);
475 static struct attribute
*disk_attrs
[] = {
476 &dev_attr_range
.attr
,
477 &dev_attr_removable
.attr
,
479 &dev_attr_capability
.attr
,
481 #ifdef CONFIG_FAIL_MAKE_REQUEST
487 static struct attribute_group disk_attr_group
= {
491 static struct attribute_group
*disk_attr_groups
[] = {
496 static void disk_release(struct device
*dev
)
498 struct gendisk
*disk
= dev_to_disk(dev
);
502 free_disk_stats(disk
);
505 struct class block_class
= {
509 static struct device_type disk_type
= {
511 .groups
= disk_attr_groups
,
512 .release
= disk_release
,
516 * aggregate disk stat collector. Uses the same stats that the sysfs
517 * entries do, above, but makes them available through one seq_file.
519 * The output looks suspiciously like /proc/partitions with a bunch of
523 static void *diskstats_start(struct seq_file
*part
, loff_t
*pos
)
528 mutex_lock(&block_class_lock
);
529 list_for_each_entry(dev
, &block_class
.devices
, node
) {
530 if (dev
->type
!= &disk_type
)
533 return dev_to_disk(dev
);
538 static void *diskstats_next(struct seq_file
*part
, void *v
, loff_t
*pos
)
540 struct gendisk
*gp
= v
;
544 list_for_each_entry(dev
, &gp
->dev
.node
, node
) {
545 if (&dev
->node
== &block_class
.devices
)
547 if (dev
->type
== &disk_type
)
548 return dev_to_disk(dev
);
553 static void diskstats_stop(struct seq_file
*part
, void *v
)
555 mutex_unlock(&block_class_lock
);
558 static int diskstats_show(struct seq_file
*s
, void *v
)
560 struct gendisk
*gp
= v
;
561 char buf
[BDEVNAME_SIZE
];
565 if (&gp->dev.kobj.entry == block_class.devices.next)
566 seq_puts(s, "major minor name"
567 " rio rmerge rsect ruse wio wmerge "
568 "wsect wuse running use aveq"
573 disk_round_stats(gp
);
575 seq_printf(s
, "%4d %4d %s %lu %lu %llu %u %lu %lu %llu %u %u %u %u\n",
576 gp
->major
, n
+ gp
->first_minor
, disk_name(gp
, n
, buf
),
577 disk_stat_read(gp
, ios
[0]), disk_stat_read(gp
, merges
[0]),
578 (unsigned long long)disk_stat_read(gp
, sectors
[0]),
579 jiffies_to_msecs(disk_stat_read(gp
, ticks
[0])),
580 disk_stat_read(gp
, ios
[1]), disk_stat_read(gp
, merges
[1]),
581 (unsigned long long)disk_stat_read(gp
, sectors
[1]),
582 jiffies_to_msecs(disk_stat_read(gp
, ticks
[1])),
584 jiffies_to_msecs(disk_stat_read(gp
, io_ticks
)),
585 jiffies_to_msecs(disk_stat_read(gp
, time_in_queue
)));
587 /* now show all non-0 size partitions of it */
588 for (n
= 0; n
< gp
->minors
- 1; n
++) {
589 struct hd_struct
*hd
= gp
->part
[n
];
591 if (!hd
|| !hd
->nr_sects
)
595 part_round_stats(hd
);
597 seq_printf(s
, "%4d %4d %s %lu %lu %llu "
598 "%u %lu %lu %llu %u %u %u %u\n",
599 gp
->major
, n
+ gp
->first_minor
+ 1,
600 disk_name(gp
, n
+ 1, buf
),
601 part_stat_read(hd
, ios
[0]),
602 part_stat_read(hd
, merges
[0]),
603 (unsigned long long)part_stat_read(hd
, sectors
[0]),
604 jiffies_to_msecs(part_stat_read(hd
, ticks
[0])),
605 part_stat_read(hd
, ios
[1]),
606 part_stat_read(hd
, merges
[1]),
607 (unsigned long long)part_stat_read(hd
, sectors
[1]),
608 jiffies_to_msecs(part_stat_read(hd
, ticks
[1])),
610 jiffies_to_msecs(part_stat_read(hd
, io_ticks
)),
611 jiffies_to_msecs(part_stat_read(hd
, time_in_queue
))
618 const struct seq_operations diskstats_op
= {
619 .start
= diskstats_start
,
620 .next
= diskstats_next
,
621 .stop
= diskstats_stop
,
622 .show
= diskstats_show
625 static void media_change_notify_thread(struct work_struct
*work
)
627 struct gendisk
*gd
= container_of(work
, struct gendisk
, async_notify
);
628 char event
[] = "MEDIA_CHANGE=1";
629 char *envp
[] = { event
, NULL
};
632 * set enviroment vars to indicate which event this is for
633 * so that user space will know to go check the media status.
635 kobject_uevent_env(&gd
->dev
.kobj
, KOBJ_CHANGE
, envp
);
636 put_device(gd
->driverfs_dev
);
640 void genhd_media_change_notify(struct gendisk
*disk
)
642 get_device(disk
->driverfs_dev
);
643 schedule_work(&disk
->async_notify
);
645 EXPORT_SYMBOL_GPL(genhd_media_change_notify
);
648 dev_t
blk_lookup_devt(const char *name
)
651 dev_t devt
= MKDEV(0, 0);
653 mutex_lock(&block_class_lock
);
654 list_for_each_entry(dev
, &block_class
.devices
, node
) {
655 if (strcmp(dev
->bus_id
, name
) == 0) {
660 mutex_unlock(&block_class_lock
);
665 EXPORT_SYMBOL(blk_lookup_devt
);
667 struct gendisk
*alloc_disk(int minors
)
669 return alloc_disk_node(minors
, -1);
672 struct gendisk
*alloc_disk_node(int minors
, int node_id
)
674 struct gendisk
*disk
;
676 disk
= kmalloc_node(sizeof(struct gendisk
),
677 GFP_KERNEL
| __GFP_ZERO
, node_id
);
679 if (!init_disk_stats(disk
)) {
684 int size
= (minors
- 1) * sizeof(struct hd_struct
*);
685 disk
->part
= kmalloc_node(size
,
686 GFP_KERNEL
| __GFP_ZERO
, node_id
);
688 free_disk_stats(disk
);
693 disk
->minors
= minors
;
694 rand_initialize_disk(disk
);
695 disk
->dev
.class = &block_class
;
696 disk
->dev
.type
= &disk_type
;
697 device_initialize(&disk
->dev
);
698 INIT_WORK(&disk
->async_notify
,
699 media_change_notify_thread
);
704 EXPORT_SYMBOL(alloc_disk
);
705 EXPORT_SYMBOL(alloc_disk_node
);
707 struct kobject
*get_disk(struct gendisk
*disk
)
709 struct module
*owner
;
710 struct kobject
*kobj
;
714 owner
= disk
->fops
->owner
;
715 if (owner
&& !try_module_get(owner
))
717 kobj
= kobject_get(&disk
->dev
.kobj
);
726 EXPORT_SYMBOL(get_disk
);
728 void put_disk(struct gendisk
*disk
)
731 kobject_put(&disk
->dev
.kobj
);
734 EXPORT_SYMBOL(put_disk
);
736 void set_device_ro(struct block_device
*bdev
, int flag
)
738 if (bdev
->bd_contains
!= bdev
)
739 bdev
->bd_part
->policy
= flag
;
741 bdev
->bd_disk
->policy
= flag
;
744 EXPORT_SYMBOL(set_device_ro
);
746 void set_disk_ro(struct gendisk
*disk
, int flag
)
750 for (i
= 0; i
< disk
->minors
- 1; i
++)
751 if (disk
->part
[i
]) disk
->part
[i
]->policy
= flag
;
754 EXPORT_SYMBOL(set_disk_ro
);
756 int bdev_read_only(struct block_device
*bdev
)
760 else if (bdev
->bd_contains
!= bdev
)
761 return bdev
->bd_part
->policy
;
763 return bdev
->bd_disk
->policy
;
766 EXPORT_SYMBOL(bdev_read_only
);
768 int invalidate_partition(struct gendisk
*disk
, int index
)
771 struct block_device
*bdev
= bdget_disk(disk
, index
);
774 res
= __invalidate_device(bdev
);
780 EXPORT_SYMBOL(invalidate_partition
);