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 struct backing_dev_info
*bdi
;
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
);
192 blk_register_queue(disk
);
193 blk_register_filter(disk
);
195 bdi
= &disk
->queue
->backing_dev_info
;
196 bdi_register_dev(bdi
, MKDEV(disk
->major
, disk
->first_minor
));
197 retval
= sysfs_create_link(&disk
->dev
.kobj
, &bdi
->dev
->kobj
, "bdi");
201 EXPORT_SYMBOL(add_disk
);
202 EXPORT_SYMBOL(del_gendisk
); /* in partitions/check.c */
204 void unlink_gendisk(struct gendisk
*disk
)
206 blk_unregister_filter(disk
);
207 sysfs_remove_link(&disk
->dev
.kobj
, "bdi");
208 bdi_unregister(&disk
->queue
->backing_dev_info
);
209 blk_unregister_queue(disk
);
210 blk_unregister_region(MKDEV(disk
->major
, disk
->first_minor
),
215 * get_gendisk - get partitioning information for a given device
216 * @dev: device to get partitioning information for
218 * This function gets the structure containing partitioning
219 * information for the given device @dev.
221 struct gendisk
*get_gendisk(dev_t devt
, int *part
)
223 struct kobject
*kobj
= kobj_lookup(bdev_map
, devt
, part
);
224 struct device
*dev
= kobj_to_dev(kobj
);
226 return kobj
? dev_to_disk(dev
) : NULL
;
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
233 static int printk_partition(struct device
*dev
, void *data
)
236 char buf
[BDEVNAME_SIZE
];
239 if (dev
->type
!= &disk_type
)
242 sgp
= dev_to_disk(dev
);
244 * Don't show empty devices or things that have been surpressed
246 if (get_capacity(sgp
) == 0 ||
247 (sgp
->flags
& GENHD_FL_SUPPRESS_PARTITION_INFO
))
251 * Note, unlike /proc/partitions, I am showing the numbers in
252 * hex - the same format as the root= option takes.
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
);
263 printk(" (driver?)\n");
265 /* now show the partitions */
266 for (n
= 0; n
< sgp
->minors
- 1; ++n
) {
267 if (sgp
->part
[n
] == NULL
)
269 if (sgp
->part
[n
]->nr_sects
== 0)
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
));
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
285 void __init
printk_all_partitions(void)
287 mutex_lock(&block_class_lock
);
288 class_for_each_device(&block_class
, NULL
, NULL
, printk_partition
);
289 mutex_unlock(&block_class_lock
);
292 #ifdef CONFIG_PROC_FS
294 static int find_start(struct device
*dev
, void *data
)
296 loff_t k
= *(loff_t
*)data
;
298 if (dev
->type
!= &disk_type
)
305 static void *part_start(struct seq_file
*part
, loff_t
*pos
)
311 seq_puts(part
, "major minor #blocks name\n\n");
313 mutex_lock(&block_class_lock
);
314 dev
= class_find_device(&block_class
, NULL
, (void *)pos
, find_start
);
316 return dev_to_disk(dev
);
320 static void *part_next(struct seq_file
*part
, void *v
, loff_t
*pos
)
322 struct gendisk
*gp
= v
;
325 list_for_each_entry(dev
, &gp
->dev
.node
, node
) {
326 if (&dev
->node
== &block_class
.devices
)
328 if (dev
->type
== &disk_type
)
329 return dev_to_disk(dev
);
334 static void part_stop(struct seq_file
*part
, void *v
)
336 mutex_unlock(&block_class_lock
);
339 static int show_partition(struct seq_file
*part
, void *v
)
341 struct gendisk
*sgp
= v
;
343 char buf
[BDEVNAME_SIZE
];
345 /* Don't show non-partitionable removeable devices or empty devices */
346 if (!get_capacity(sgp
) ||
347 (sgp
->minors
== 1 && (sgp
->flags
& GENHD_FL_REMOVABLE
)))
349 if (sgp
->flags
& GENHD_FL_SUPPRESS_PARTITION_INFO
)
352 /* show the full disk and all non-0 size partitions of it */
353 seq_printf(part
, "%4d %4d %10llu %s\n",
354 sgp
->major
, sgp
->first_minor
,
355 (unsigned long long)get_capacity(sgp
) >> 1,
356 disk_name(sgp
, 0, buf
));
357 for (n
= 0; n
< sgp
->minors
- 1; n
++) {
360 if (sgp
->part
[n
]->nr_sects
== 0)
362 seq_printf(part
, "%4d %4d %10llu %s\n",
363 sgp
->major
, n
+ 1 + sgp
->first_minor
,
364 (unsigned long long)sgp
->part
[n
]->nr_sects
>> 1 ,
365 disk_name(sgp
, n
+ 1, buf
));
371 const struct seq_operations partitions_op
= {
375 .show
= show_partition
380 static struct kobject
*base_probe(dev_t devt
, int *part
, void *data
)
382 if (request_module("block-major-%d-%d", MAJOR(devt
), MINOR(devt
)) > 0)
383 /* Make old-style 2.4 aliases work */
384 request_module("block-major-%d", MAJOR(devt
));
388 static int __init
genhd_device_init(void)
392 block_class
.dev_kobj
= sysfs_dev_block_kobj
;
393 error
= class_register(&block_class
);
396 bdev_map
= kobj_map_init(base_probe
, &block_class_lock
);
399 #ifndef CONFIG_SYSFS_DEPRECATED
400 /* create top-level block dir */
401 block_depr
= kobject_create_and_add("block", NULL
);
406 subsys_initcall(genhd_device_init
);
408 static ssize_t
disk_range_show(struct device
*dev
,
409 struct device_attribute
*attr
, char *buf
)
411 struct gendisk
*disk
= dev_to_disk(dev
);
413 return sprintf(buf
, "%d\n", disk
->minors
);
416 static ssize_t
disk_removable_show(struct device
*dev
,
417 struct device_attribute
*attr
, char *buf
)
419 struct gendisk
*disk
= dev_to_disk(dev
);
421 return sprintf(buf
, "%d\n",
422 (disk
->flags
& GENHD_FL_REMOVABLE
? 1 : 0));
425 static ssize_t
disk_ro_show(struct device
*dev
,
426 struct device_attribute
*attr
, char *buf
)
428 struct gendisk
*disk
= dev_to_disk(dev
);
430 return sprintf(buf
, "%d\n", disk
->policy
? 1 : 0);
433 static ssize_t
disk_size_show(struct device
*dev
,
434 struct device_attribute
*attr
, char *buf
)
436 struct gendisk
*disk
= dev_to_disk(dev
);
438 return sprintf(buf
, "%llu\n", (unsigned long long)get_capacity(disk
));
441 static ssize_t
disk_capability_show(struct device
*dev
,
442 struct device_attribute
*attr
, char *buf
)
444 struct gendisk
*disk
= dev_to_disk(dev
);
446 return sprintf(buf
, "%x\n", disk
->flags
);
449 static ssize_t
disk_stat_show(struct device
*dev
,
450 struct device_attribute
*attr
, char *buf
)
452 struct gendisk
*disk
= dev_to_disk(dev
);
455 disk_round_stats(disk
);
458 "%8lu %8lu %8llu %8u "
459 "%8lu %8lu %8llu %8u "
462 disk_stat_read(disk
, ios
[READ
]),
463 disk_stat_read(disk
, merges
[READ
]),
464 (unsigned long long)disk_stat_read(disk
, sectors
[READ
]),
465 jiffies_to_msecs(disk_stat_read(disk
, ticks
[READ
])),
466 disk_stat_read(disk
, ios
[WRITE
]),
467 disk_stat_read(disk
, merges
[WRITE
]),
468 (unsigned long long)disk_stat_read(disk
, sectors
[WRITE
]),
469 jiffies_to_msecs(disk_stat_read(disk
, ticks
[WRITE
])),
471 jiffies_to_msecs(disk_stat_read(disk
, io_ticks
)),
472 jiffies_to_msecs(disk_stat_read(disk
, time_in_queue
)));
475 #ifdef CONFIG_FAIL_MAKE_REQUEST
476 static ssize_t
disk_fail_show(struct device
*dev
,
477 struct device_attribute
*attr
, char *buf
)
479 struct gendisk
*disk
= dev_to_disk(dev
);
481 return sprintf(buf
, "%d\n", disk
->flags
& GENHD_FL_FAIL
? 1 : 0);
484 static ssize_t
disk_fail_store(struct device
*dev
,
485 struct device_attribute
*attr
,
486 const char *buf
, size_t count
)
488 struct gendisk
*disk
= dev_to_disk(dev
);
491 if (count
> 0 && sscanf(buf
, "%d", &i
) > 0) {
493 disk
->flags
&= ~GENHD_FL_FAIL
;
495 disk
->flags
|= GENHD_FL_FAIL
;
503 static DEVICE_ATTR(range
, S_IRUGO
, disk_range_show
, NULL
);
504 static DEVICE_ATTR(removable
, S_IRUGO
, disk_removable_show
, NULL
);
505 static DEVICE_ATTR(ro
, S_IRUGO
, disk_ro_show
, NULL
);
506 static DEVICE_ATTR(size
, S_IRUGO
, disk_size_show
, NULL
);
507 static DEVICE_ATTR(capability
, S_IRUGO
, disk_capability_show
, NULL
);
508 static DEVICE_ATTR(stat
, S_IRUGO
, disk_stat_show
, NULL
);
509 #ifdef CONFIG_FAIL_MAKE_REQUEST
510 static struct device_attribute dev_attr_fail
=
511 __ATTR(make
-it
-fail
, S_IRUGO
|S_IWUSR
, disk_fail_show
, disk_fail_store
);
514 static struct attribute
*disk_attrs
[] = {
515 &dev_attr_range
.attr
,
516 &dev_attr_removable
.attr
,
519 &dev_attr_capability
.attr
,
521 #ifdef CONFIG_FAIL_MAKE_REQUEST
527 static struct attribute_group disk_attr_group
= {
531 static struct attribute_group
*disk_attr_groups
[] = {
536 static void disk_release(struct device
*dev
)
538 struct gendisk
*disk
= dev_to_disk(dev
);
542 free_disk_stats(disk
);
545 struct class block_class
= {
549 static struct device_type disk_type
= {
551 .groups
= disk_attr_groups
,
552 .release
= disk_release
,
555 #ifdef CONFIG_PROC_FS
557 * aggregate disk stat collector. Uses the same stats that the sysfs
558 * entries do, above, but makes them available through one seq_file.
560 * The output looks suspiciously like /proc/partitions with a bunch of
564 static void *diskstats_start(struct seq_file
*part
, loff_t
*pos
)
568 mutex_lock(&block_class_lock
);
569 dev
= class_find_device(&block_class
, NULL
, (void *)pos
, find_start
);
571 return dev_to_disk(dev
);
575 static void *diskstats_next(struct seq_file
*part
, void *v
, loff_t
*pos
)
577 struct gendisk
*gp
= v
;
581 list_for_each_entry(dev
, &gp
->dev
.node
, node
) {
582 if (&dev
->node
== &block_class
.devices
)
584 if (dev
->type
== &disk_type
)
585 return dev_to_disk(dev
);
590 static void diskstats_stop(struct seq_file
*part
, void *v
)
592 mutex_unlock(&block_class_lock
);
595 static int diskstats_show(struct seq_file
*s
, void *v
)
597 struct gendisk
*gp
= v
;
598 char buf
[BDEVNAME_SIZE
];
602 if (&gp->dev.kobj.entry == block_class.devices.next)
603 seq_puts(s, "major minor name"
604 " rio rmerge rsect ruse wio wmerge "
605 "wsect wuse running use aveq"
610 disk_round_stats(gp
);
612 seq_printf(s
, "%4d %4d %s %lu %lu %llu %u %lu %lu %llu %u %u %u %u\n",
613 gp
->major
, n
+ gp
->first_minor
, disk_name(gp
, n
, buf
),
614 disk_stat_read(gp
, ios
[0]), disk_stat_read(gp
, merges
[0]),
615 (unsigned long long)disk_stat_read(gp
, sectors
[0]),
616 jiffies_to_msecs(disk_stat_read(gp
, ticks
[0])),
617 disk_stat_read(gp
, ios
[1]), disk_stat_read(gp
, merges
[1]),
618 (unsigned long long)disk_stat_read(gp
, sectors
[1]),
619 jiffies_to_msecs(disk_stat_read(gp
, ticks
[1])),
621 jiffies_to_msecs(disk_stat_read(gp
, io_ticks
)),
622 jiffies_to_msecs(disk_stat_read(gp
, time_in_queue
)));
624 /* now show all non-0 size partitions of it */
625 for (n
= 0; n
< gp
->minors
- 1; n
++) {
626 struct hd_struct
*hd
= gp
->part
[n
];
628 if (!hd
|| !hd
->nr_sects
)
632 part_round_stats(hd
);
634 seq_printf(s
, "%4d %4d %s %lu %lu %llu "
635 "%u %lu %lu %llu %u %u %u %u\n",
636 gp
->major
, n
+ gp
->first_minor
+ 1,
637 disk_name(gp
, n
+ 1, buf
),
638 part_stat_read(hd
, ios
[0]),
639 part_stat_read(hd
, merges
[0]),
640 (unsigned long long)part_stat_read(hd
, sectors
[0]),
641 jiffies_to_msecs(part_stat_read(hd
, ticks
[0])),
642 part_stat_read(hd
, ios
[1]),
643 part_stat_read(hd
, merges
[1]),
644 (unsigned long long)part_stat_read(hd
, sectors
[1]),
645 jiffies_to_msecs(part_stat_read(hd
, ticks
[1])),
647 jiffies_to_msecs(part_stat_read(hd
, io_ticks
)),
648 jiffies_to_msecs(part_stat_read(hd
, time_in_queue
))
655 const struct seq_operations diskstats_op
= {
656 .start
= diskstats_start
,
657 .next
= diskstats_next
,
658 .stop
= diskstats_stop
,
659 .show
= diskstats_show
661 #endif /* CONFIG_PROC_FS */
663 static void media_change_notify_thread(struct work_struct
*work
)
665 struct gendisk
*gd
= container_of(work
, struct gendisk
, async_notify
);
666 char event
[] = "MEDIA_CHANGE=1";
667 char *envp
[] = { event
, NULL
};
670 * set enviroment vars to indicate which event this is for
671 * so that user space will know to go check the media status.
673 kobject_uevent_env(&gd
->dev
.kobj
, KOBJ_CHANGE
, envp
);
674 put_device(gd
->driverfs_dev
);
678 void genhd_media_change_notify(struct gendisk
*disk
)
680 get_device(disk
->driverfs_dev
);
681 schedule_work(&disk
->async_notify
);
683 EXPORT_SYMBOL_GPL(genhd_media_change_notify
);
691 static int match_id(struct device
*dev
, void *data
)
693 struct find_block
*find
= data
;
695 if (dev
->type
!= &disk_type
)
697 if (strcmp(dev
->bus_id
, find
->name
) == 0) {
698 struct gendisk
*disk
= dev_to_disk(dev
);
699 if (find
->part
< disk
->minors
)
705 dev_t
blk_lookup_devt(const char *name
, int part
)
708 dev_t devt
= MKDEV(0, 0);
709 struct find_block find
;
711 mutex_lock(&block_class_lock
);
714 dev
= class_find_device(&block_class
, NULL
, (void *)&find
, match_id
);
716 devt
= MKDEV(MAJOR(dev
->devt
),
717 MINOR(dev
->devt
) + part
);
718 mutex_unlock(&block_class_lock
);
722 EXPORT_SYMBOL(blk_lookup_devt
);
724 struct gendisk
*alloc_disk(int minors
)
726 return alloc_disk_node(minors
, -1);
729 struct gendisk
*alloc_disk_node(int minors
, int node_id
)
731 struct gendisk
*disk
;
733 disk
= kmalloc_node(sizeof(struct gendisk
),
734 GFP_KERNEL
| __GFP_ZERO
, node_id
);
736 if (!init_disk_stats(disk
)) {
741 int size
= (minors
- 1) * sizeof(struct hd_struct
*);
742 disk
->part
= kmalloc_node(size
,
743 GFP_KERNEL
| __GFP_ZERO
, node_id
);
745 free_disk_stats(disk
);
750 disk
->minors
= minors
;
751 rand_initialize_disk(disk
);
752 disk
->dev
.class = &block_class
;
753 disk
->dev
.type
= &disk_type
;
754 device_initialize(&disk
->dev
);
755 INIT_WORK(&disk
->async_notify
,
756 media_change_notify_thread
);
761 EXPORT_SYMBOL(alloc_disk
);
762 EXPORT_SYMBOL(alloc_disk_node
);
764 struct kobject
*get_disk(struct gendisk
*disk
)
766 struct module
*owner
;
767 struct kobject
*kobj
;
771 owner
= disk
->fops
->owner
;
772 if (owner
&& !try_module_get(owner
))
774 kobj
= kobject_get(&disk
->dev
.kobj
);
783 EXPORT_SYMBOL(get_disk
);
785 void put_disk(struct gendisk
*disk
)
788 kobject_put(&disk
->dev
.kobj
);
791 EXPORT_SYMBOL(put_disk
);
793 void set_device_ro(struct block_device
*bdev
, int flag
)
795 if (bdev
->bd_contains
!= bdev
)
796 bdev
->bd_part
->policy
= flag
;
798 bdev
->bd_disk
->policy
= flag
;
801 EXPORT_SYMBOL(set_device_ro
);
803 void set_disk_ro(struct gendisk
*disk
, int flag
)
807 for (i
= 0; i
< disk
->minors
- 1; i
++)
808 if (disk
->part
[i
]) disk
->part
[i
]->policy
= flag
;
811 EXPORT_SYMBOL(set_disk_ro
);
813 int bdev_read_only(struct block_device
*bdev
)
817 else if (bdev
->bd_contains
!= bdev
)
818 return bdev
->bd_part
->policy
;
820 return bdev
->bd_disk
->policy
;
823 EXPORT_SYMBOL(bdev_read_only
);
825 int invalidate_partition(struct gendisk
*disk
, int index
)
828 struct block_device
*bdev
= bdget_disk(disk
, index
);
831 res
= __invalidate_device(bdev
);
837 EXPORT_SYMBOL(invalidate_partition
);