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>
19 #include <linux/idr.h>
23 static DEFINE_MUTEX(block_class_lock
);
24 #ifndef CONFIG_SYSFS_DEPRECATED
25 struct kobject
*block_depr
;
28 /* for extended dynamic devt allocation, currently only one major is used */
29 #define MAX_EXT_DEVT (1 << MINORBITS)
31 /* For extended devt allocation. ext_devt_mutex prevents look up
32 * results from going away underneath its user.
34 static DEFINE_MUTEX(ext_devt_mutex
);
35 static DEFINE_IDR(ext_devt_idr
);
37 static struct device_type disk_type
;
40 * disk_get_part - get partition
41 * @disk: disk to look partition from
42 * @partno: partition number
44 * Look for partition @partno from @disk. If found, increment
45 * reference count and return it.
51 * Pointer to the found partition on success, NULL if not found.
53 struct hd_struct
*disk_get_part(struct gendisk
*disk
, int partno
)
55 struct hd_struct
*part
;
57 if (unlikely(partno
< 1 || partno
> disk_max_parts(disk
)))
60 part
= rcu_dereference(disk
->__part
[partno
- 1]);
62 get_device(&part
->dev
);
67 EXPORT_SYMBOL_GPL(disk_get_part
);
70 * disk_part_iter_init - initialize partition iterator
71 * @piter: iterator to initialize
72 * @disk: disk to iterate over
73 * @flags: DISK_PITER_* flags
75 * Initialize @piter so that it iterates over partitions of @disk.
80 void disk_part_iter_init(struct disk_part_iter
*piter
, struct gendisk
*disk
,
86 if (flags
& DISK_PITER_REVERSE
)
87 piter
->idx
= disk_max_parts(piter
->disk
) - 1;
93 EXPORT_SYMBOL_GPL(disk_part_iter_init
);
96 * disk_part_iter_next - proceed iterator to the next partition and return it
97 * @piter: iterator of interest
99 * Proceed @piter to the next partition and return it.
104 struct hd_struct
*disk_part_iter_next(struct disk_part_iter
*piter
)
108 /* put the last partition */
109 disk_put_part(piter
->part
);
114 /* determine iteration parameters */
115 if (piter
->flags
& DISK_PITER_REVERSE
) {
120 end
= disk_max_parts(piter
->disk
);
123 /* iterate to the next partition */
124 for (; piter
->idx
!= end
; piter
->idx
+= inc
) {
125 struct hd_struct
*part
;
127 part
= rcu_dereference(piter
->disk
->__part
[piter
->idx
]);
130 if (!(piter
->flags
& DISK_PITER_INCL_EMPTY
) && !part
->nr_sects
)
133 get_device(&part
->dev
);
143 EXPORT_SYMBOL_GPL(disk_part_iter_next
);
146 * disk_part_iter_exit - finish up partition iteration
147 * @piter: iter of interest
149 * Called when iteration is over. Cleans up @piter.
154 void disk_part_iter_exit(struct disk_part_iter
*piter
)
156 disk_put_part(piter
->part
);
159 EXPORT_SYMBOL_GPL(disk_part_iter_exit
);
162 * disk_map_sector_rcu - map sector to partition
163 * @disk: gendisk of interest
164 * @sector: sector to map
166 * Find out which partition @sector maps to on @disk. This is
167 * primarily used for stats accounting.
170 * RCU read locked. The returned partition pointer is valid only
171 * while preemption is disabled.
174 * Found partition on success, NULL if there's no matching partition.
176 struct hd_struct
*disk_map_sector_rcu(struct gendisk
*disk
, sector_t sector
)
180 for (i
= 0; i
< disk_max_parts(disk
); i
++) {
181 struct hd_struct
*part
= rcu_dereference(disk
->__part
[i
]);
183 if (part
&& part
->start_sect
<= sector
&&
184 sector
< part
->start_sect
+ part
->nr_sects
)
189 EXPORT_SYMBOL_GPL(disk_map_sector_rcu
);
192 * Can be deleted altogether. Later.
195 static struct blk_major_name
{
196 struct blk_major_name
*next
;
199 } *major_names
[BLKDEV_MAJOR_HASH_SIZE
];
201 /* index in the above - for now: assume no multimajor ranges */
202 static inline int major_to_index(int major
)
204 return major
% BLKDEV_MAJOR_HASH_SIZE
;
207 #ifdef CONFIG_PROC_FS
208 void blkdev_show(struct seq_file
*seqf
, off_t offset
)
210 struct blk_major_name
*dp
;
212 if (offset
< BLKDEV_MAJOR_HASH_SIZE
) {
213 mutex_lock(&block_class_lock
);
214 for (dp
= major_names
[offset
]; dp
; dp
= dp
->next
)
215 seq_printf(seqf
, "%3d %s\n", dp
->major
, dp
->name
);
216 mutex_unlock(&block_class_lock
);
219 #endif /* CONFIG_PROC_FS */
221 int register_blkdev(unsigned int major
, const char *name
)
223 struct blk_major_name
**n
, *p
;
226 mutex_lock(&block_class_lock
);
230 for (index
= ARRAY_SIZE(major_names
)-1; index
> 0; index
--) {
231 if (major_names
[index
] == NULL
)
236 printk("register_blkdev: failed to get major for %s\n",
245 p
= kmalloc(sizeof(struct blk_major_name
), GFP_KERNEL
);
252 strlcpy(p
->name
, name
, sizeof(p
->name
));
254 index
= major_to_index(major
);
256 for (n
= &major_names
[index
]; *n
; n
= &(*n
)->next
) {
257 if ((*n
)->major
== major
)
266 printk("register_blkdev: cannot get major %d for %s\n",
271 mutex_unlock(&block_class_lock
);
275 EXPORT_SYMBOL(register_blkdev
);
277 void unregister_blkdev(unsigned int major
, const char *name
)
279 struct blk_major_name
**n
;
280 struct blk_major_name
*p
= NULL
;
281 int index
= major_to_index(major
);
283 mutex_lock(&block_class_lock
);
284 for (n
= &major_names
[index
]; *n
; n
= &(*n
)->next
)
285 if ((*n
)->major
== major
)
287 if (!*n
|| strcmp((*n
)->name
, name
)) {
293 mutex_unlock(&block_class_lock
);
297 EXPORT_SYMBOL(unregister_blkdev
);
299 static struct kobj_map
*bdev_map
;
302 * blk_alloc_devt - allocate a dev_t for a partition
303 * @part: partition to allocate dev_t for
304 * @gfp_mask: memory allocation flag
305 * @devt: out parameter for resulting dev_t
307 * Allocate a dev_t for block device.
310 * 0 on success, allocated dev_t is returned in *@devt. -errno on
316 int blk_alloc_devt(struct hd_struct
*part
, dev_t
*devt
)
318 struct gendisk
*disk
= part_to_disk(part
);
321 /* in consecutive minor range? */
322 if (part
->partno
< disk
->minors
) {
323 *devt
= MKDEV(disk
->major
, disk
->first_minor
+ part
->partno
);
327 /* allocate ext devt */
329 if (!idr_pre_get(&ext_devt_idr
, GFP_KERNEL
))
331 rc
= idr_get_new(&ext_devt_idr
, part
, &idx
);
332 } while (rc
== -EAGAIN
);
337 if (idx
> MAX_EXT_DEVT
) {
338 idr_remove(&ext_devt_idr
, idx
);
342 *devt
= MKDEV(BLOCK_EXT_MAJOR
, idx
);
347 * blk_free_devt - free a dev_t
348 * @devt: dev_t to free
350 * Free @devt which was allocated using blk_alloc_devt().
355 void blk_free_devt(dev_t devt
)
359 if (devt
== MKDEV(0, 0))
362 if (MAJOR(devt
) == BLOCK_EXT_MAJOR
) {
363 mutex_lock(&ext_devt_mutex
);
364 idr_remove(&ext_devt_idr
, MINOR(devt
));
365 mutex_unlock(&ext_devt_mutex
);
369 static char *bdevt_str(dev_t devt
, char *buf
)
371 if (MAJOR(devt
) <= 0xff && MINOR(devt
) <= 0xff) {
372 char tbuf
[BDEVT_SIZE
];
373 snprintf(tbuf
, BDEVT_SIZE
, "%02x%02x", MAJOR(devt
), MINOR(devt
));
374 snprintf(buf
, BDEVT_SIZE
, "%-9s", tbuf
);
376 snprintf(buf
, BDEVT_SIZE
, "%03x:%05x", MAJOR(devt
), MINOR(devt
));
382 * Register device numbers dev..(dev+range-1)
383 * range must be nonzero
384 * The hash chain is sorted on range, so that subranges can override.
386 void blk_register_region(dev_t devt
, unsigned long range
, struct module
*module
,
387 struct kobject
*(*probe
)(dev_t
, int *, void *),
388 int (*lock
)(dev_t
, void *), void *data
)
390 kobj_map(bdev_map
, devt
, range
, module
, probe
, lock
, data
);
393 EXPORT_SYMBOL(blk_register_region
);
395 void blk_unregister_region(dev_t devt
, unsigned long range
)
397 kobj_unmap(bdev_map
, devt
, range
);
400 EXPORT_SYMBOL(blk_unregister_region
);
402 static struct kobject
*exact_match(dev_t devt
, int *partno
, void *data
)
404 struct gendisk
*p
= data
;
409 static int exact_lock(dev_t devt
, void *data
)
411 struct gendisk
*p
= data
;
419 * add_disk - add partitioning information to kernel list
420 * @disk: per-device partitioning information
422 * This function registers the partitioning information in @disk
425 void add_disk(struct gendisk
*disk
)
427 struct backing_dev_info
*bdi
;
430 disk
->flags
|= GENHD_FL_UP
;
431 disk
->dev
.devt
= MKDEV(disk
->major
, disk
->first_minor
);
432 blk_register_region(disk_devt(disk
), disk
->minors
, NULL
,
433 exact_match
, exact_lock
, disk
);
435 blk_register_queue(disk
);
437 bdi
= &disk
->queue
->backing_dev_info
;
438 bdi_register_dev(bdi
, disk_devt(disk
));
439 retval
= sysfs_create_link(&disk
->dev
.kobj
, &bdi
->dev
->kobj
, "bdi");
443 EXPORT_SYMBOL(add_disk
);
444 EXPORT_SYMBOL(del_gendisk
); /* in partitions/check.c */
446 void unlink_gendisk(struct gendisk
*disk
)
448 sysfs_remove_link(&disk
->dev
.kobj
, "bdi");
449 bdi_unregister(&disk
->queue
->backing_dev_info
);
450 blk_unregister_queue(disk
);
451 blk_unregister_region(disk_devt(disk
), disk
->minors
);
455 * get_gendisk - get partitioning information for a given device
456 * @devt: device to get partitioning information for
457 * @part: returned partition index
459 * This function gets the structure containing partitioning
460 * information for the given device @devt.
462 struct gendisk
*get_gendisk(dev_t devt
, int *partno
)
464 struct gendisk
*disk
= NULL
;
466 if (MAJOR(devt
) != BLOCK_EXT_MAJOR
) {
467 struct kobject
*kobj
;
469 kobj
= kobj_lookup(bdev_map
, devt
, partno
);
471 disk
= dev_to_disk(kobj_to_dev(kobj
));
473 struct hd_struct
*part
;
475 mutex_lock(&ext_devt_mutex
);
476 part
= idr_find(&ext_devt_idr
, MINOR(devt
));
477 if (part
&& get_disk(part_to_disk(part
))) {
478 *partno
= part
->partno
;
479 disk
= part_to_disk(part
);
481 mutex_unlock(&ext_devt_mutex
);
488 * bdget_disk - do bdget() by gendisk and partition number
489 * @disk: gendisk of interest
490 * @partno: partition number
492 * Find partition @partno from @disk, do bdget() on it.
498 * Resulting block_device on success, NULL on failure.
500 extern struct block_device
*bdget_disk(struct gendisk
*disk
, int partno
)
502 dev_t devt
= MKDEV(0, 0);
505 devt
= disk_devt(disk
);
507 struct hd_struct
*part
;
509 part
= disk_get_part(disk
, partno
);
510 if (part
&& part
->nr_sects
)
511 devt
= part_devt(part
);
515 if (likely(devt
!= MKDEV(0, 0)))
519 EXPORT_SYMBOL(bdget_disk
);
522 * print a full list of all partitions - intended for places where the root
523 * filesystem can't be mounted and thus to give the victim some idea of what
526 void __init
printk_all_partitions(void)
528 struct class_dev_iter iter
;
531 class_dev_iter_init(&iter
, &block_class
, NULL
, &disk_type
);
532 while ((dev
= class_dev_iter_next(&iter
))) {
533 struct gendisk
*disk
= dev_to_disk(dev
);
534 struct disk_part_iter piter
;
535 struct hd_struct
*part
;
536 char name_buf
[BDEVNAME_SIZE
];
537 char devt_buf
[BDEVT_SIZE
];
540 * Don't show empty devices or things that have been
543 if (get_capacity(disk
) == 0 ||
544 (disk
->flags
& GENHD_FL_SUPPRESS_PARTITION_INFO
))
548 * Note, unlike /proc/partitions, I am showing the
549 * numbers in hex - the same format as the root=
552 printk("%s %10llu %s",
553 bdevt_str(disk_devt(disk
), devt_buf
),
554 (unsigned long long)get_capacity(disk
) >> 1,
555 disk_name(disk
, 0, name_buf
));
556 if (disk
->driverfs_dev
!= NULL
&&
557 disk
->driverfs_dev
->driver
!= NULL
)
558 printk(" driver: %s\n",
559 disk
->driverfs_dev
->driver
->name
);
561 printk(" (driver?)\n");
563 /* now show the partitions */
564 disk_part_iter_init(&piter
, disk
, 0);
565 while ((part
= disk_part_iter_next(&piter
)))
566 printk(" %s %10llu %s\n",
567 bdevt_str(part_devt(part
), devt_buf
),
568 (unsigned long long)part
->nr_sects
>> 1,
569 disk_name(disk
, part
->partno
, name_buf
));
570 disk_part_iter_exit(&piter
);
572 class_dev_iter_exit(&iter
);
575 #ifdef CONFIG_PROC_FS
577 static void *disk_seqf_start(struct seq_file
*seqf
, loff_t
*pos
)
580 struct class_dev_iter
*iter
;
583 iter
= kmalloc(GFP_KERNEL
, sizeof(*iter
));
585 return ERR_PTR(-ENOMEM
);
587 seqf
->private = iter
;
588 class_dev_iter_init(iter
, &block_class
, NULL
, &disk_type
);
590 dev
= class_dev_iter_next(iter
);
595 return dev_to_disk(dev
);
598 static void *disk_seqf_next(struct seq_file
*seqf
, void *v
, loff_t
*pos
)
603 dev
= class_dev_iter_next(seqf
->private);
605 return dev_to_disk(dev
);
610 static void disk_seqf_stop(struct seq_file
*seqf
, void *v
)
612 struct class_dev_iter
*iter
= seqf
->private;
614 /* stop is called even after start failed :-( */
616 class_dev_iter_exit(iter
);
621 static void *show_partition_start(struct seq_file
*seqf
, loff_t
*pos
)
625 p
= disk_seqf_start(seqf
, pos
);
627 seq_puts(seqf
, "major minor #blocks name\n\n");
631 static int show_partition(struct seq_file
*seqf
, void *v
)
633 struct gendisk
*sgp
= v
;
634 struct disk_part_iter piter
;
635 struct hd_struct
*part
;
636 char buf
[BDEVNAME_SIZE
];
638 /* Don't show non-partitionable removeable devices or empty devices */
639 if (!get_capacity(sgp
) || (!disk_max_parts(sgp
) &&
640 (sgp
->flags
& GENHD_FL_REMOVABLE
)))
642 if (sgp
->flags
& GENHD_FL_SUPPRESS_PARTITION_INFO
)
645 /* show the full disk and all non-0 size partitions of it */
646 seq_printf(seqf
, "%4d %7d %10llu %s\n",
647 MAJOR(disk_devt(sgp
)), MINOR(disk_devt(sgp
)),
648 (unsigned long long)get_capacity(sgp
) >> 1,
649 disk_name(sgp
, 0, buf
));
651 disk_part_iter_init(&piter
, sgp
, 0);
652 while ((part
= disk_part_iter_next(&piter
)))
653 seq_printf(seqf
, "%4d %7d %10llu %s\n",
654 MAJOR(part_devt(part
)), MINOR(part_devt(part
)),
655 (unsigned long long)part
->nr_sects
>> 1,
656 disk_name(sgp
, part
->partno
, buf
));
657 disk_part_iter_exit(&piter
);
662 const struct seq_operations partitions_op
= {
663 .start
= show_partition_start
,
664 .next
= disk_seqf_next
,
665 .stop
= disk_seqf_stop
,
666 .show
= show_partition
671 static struct kobject
*base_probe(dev_t devt
, int *partno
, void *data
)
673 if (request_module("block-major-%d-%d", MAJOR(devt
), MINOR(devt
)) > 0)
674 /* Make old-style 2.4 aliases work */
675 request_module("block-major-%d", MAJOR(devt
));
679 static int __init
genhd_device_init(void)
683 block_class
.dev_kobj
= sysfs_dev_block_kobj
;
684 error
= class_register(&block_class
);
687 bdev_map
= kobj_map_init(base_probe
, &block_class_lock
);
690 #ifndef CONFIG_SYSFS_DEPRECATED
691 /* create top-level block dir */
692 block_depr
= kobject_create_and_add("block", NULL
);
697 subsys_initcall(genhd_device_init
);
699 static ssize_t
disk_range_show(struct device
*dev
,
700 struct device_attribute
*attr
, char *buf
)
702 struct gendisk
*disk
= dev_to_disk(dev
);
704 return sprintf(buf
, "%d\n", disk
->minors
);
707 static ssize_t
disk_ext_range_show(struct device
*dev
,
708 struct device_attribute
*attr
, char *buf
)
710 struct gendisk
*disk
= dev_to_disk(dev
);
712 return sprintf(buf
, "%d\n", disk_max_parts(disk
) + 1);
715 static ssize_t
disk_removable_show(struct device
*dev
,
716 struct device_attribute
*attr
, char *buf
)
718 struct gendisk
*disk
= dev_to_disk(dev
);
720 return sprintf(buf
, "%d\n",
721 (disk
->flags
& GENHD_FL_REMOVABLE
? 1 : 0));
724 static ssize_t
disk_ro_show(struct device
*dev
,
725 struct device_attribute
*attr
, char *buf
)
727 struct gendisk
*disk
= dev_to_disk(dev
);
729 return sprintf(buf
, "%d\n", disk
->policy
? 1 : 0);
732 static ssize_t
disk_size_show(struct device
*dev
,
733 struct device_attribute
*attr
, char *buf
)
735 struct gendisk
*disk
= dev_to_disk(dev
);
737 return sprintf(buf
, "%llu\n", (unsigned long long)get_capacity(disk
));
740 static ssize_t
disk_capability_show(struct device
*dev
,
741 struct device_attribute
*attr
, char *buf
)
743 struct gendisk
*disk
= dev_to_disk(dev
);
745 return sprintf(buf
, "%x\n", disk
->flags
);
748 static ssize_t
disk_stat_show(struct device
*dev
,
749 struct device_attribute
*attr
, char *buf
)
751 struct gendisk
*disk
= dev_to_disk(dev
);
754 cpu
= disk_stat_lock();
755 disk_round_stats(cpu
, disk
);
758 "%8lu %8lu %8llu %8u "
759 "%8lu %8lu %8llu %8u "
762 disk_stat_read(disk
, ios
[READ
]),
763 disk_stat_read(disk
, merges
[READ
]),
764 (unsigned long long)disk_stat_read(disk
, sectors
[READ
]),
765 jiffies_to_msecs(disk_stat_read(disk
, ticks
[READ
])),
766 disk_stat_read(disk
, ios
[WRITE
]),
767 disk_stat_read(disk
, merges
[WRITE
]),
768 (unsigned long long)disk_stat_read(disk
, sectors
[WRITE
]),
769 jiffies_to_msecs(disk_stat_read(disk
, ticks
[WRITE
])),
771 jiffies_to_msecs(disk_stat_read(disk
, io_ticks
)),
772 jiffies_to_msecs(disk_stat_read(disk
, time_in_queue
)));
775 #ifdef CONFIG_FAIL_MAKE_REQUEST
776 static ssize_t
disk_fail_show(struct device
*dev
,
777 struct device_attribute
*attr
, char *buf
)
779 struct gendisk
*disk
= dev_to_disk(dev
);
781 return sprintf(buf
, "%d\n", disk
->flags
& GENHD_FL_FAIL
? 1 : 0);
784 static ssize_t
disk_fail_store(struct device
*dev
,
785 struct device_attribute
*attr
,
786 const char *buf
, size_t count
)
788 struct gendisk
*disk
= dev_to_disk(dev
);
791 if (count
> 0 && sscanf(buf
, "%d", &i
) > 0) {
793 disk
->flags
&= ~GENHD_FL_FAIL
;
795 disk
->flags
|= GENHD_FL_FAIL
;
803 static DEVICE_ATTR(range
, S_IRUGO
, disk_range_show
, NULL
);
804 static DEVICE_ATTR(ext_range
, S_IRUGO
, disk_ext_range_show
, NULL
);
805 static DEVICE_ATTR(removable
, S_IRUGO
, disk_removable_show
, NULL
);
806 static DEVICE_ATTR(ro
, S_IRUGO
, disk_ro_show
, NULL
);
807 static DEVICE_ATTR(size
, S_IRUGO
, disk_size_show
, NULL
);
808 static DEVICE_ATTR(capability
, S_IRUGO
, disk_capability_show
, NULL
);
809 static DEVICE_ATTR(stat
, S_IRUGO
, disk_stat_show
, NULL
);
810 #ifdef CONFIG_FAIL_MAKE_REQUEST
811 static struct device_attribute dev_attr_fail
=
812 __ATTR(make
-it
-fail
, S_IRUGO
|S_IWUSR
, disk_fail_show
, disk_fail_store
);
815 static struct attribute
*disk_attrs
[] = {
816 &dev_attr_range
.attr
,
817 &dev_attr_ext_range
.attr
,
818 &dev_attr_removable
.attr
,
821 &dev_attr_capability
.attr
,
823 #ifdef CONFIG_FAIL_MAKE_REQUEST
829 static struct attribute_group disk_attr_group
= {
833 static struct attribute_group
*disk_attr_groups
[] = {
838 static void disk_release(struct device
*dev
)
840 struct gendisk
*disk
= dev_to_disk(dev
);
844 free_disk_stats(disk
);
847 struct class block_class
= {
851 static struct device_type disk_type
= {
853 .groups
= disk_attr_groups
,
854 .release
= disk_release
,
857 #ifdef CONFIG_PROC_FS
859 * aggregate disk stat collector. Uses the same stats that the sysfs
860 * entries do, above, but makes them available through one seq_file.
862 * The output looks suspiciously like /proc/partitions with a bunch of
865 static int diskstats_show(struct seq_file
*seqf
, void *v
)
867 struct gendisk
*gp
= v
;
868 struct disk_part_iter piter
;
869 struct hd_struct
*hd
;
870 char buf
[BDEVNAME_SIZE
];
874 if (&gp->dev.kobj.entry == block_class.devices.next)
875 seq_puts(seqf, "major minor name"
876 " rio rmerge rsect ruse wio wmerge "
877 "wsect wuse running use aveq"
881 cpu
= disk_stat_lock();
882 disk_round_stats(cpu
, gp
);
884 seq_printf(seqf
, "%4d %7d %s %lu %lu %llu %u %lu %lu %llu %u %u %u %u\n",
885 MAJOR(disk_devt(gp
)), MINOR(disk_devt(gp
)),
886 disk_name(gp
, 0, buf
),
887 disk_stat_read(gp
, ios
[0]), disk_stat_read(gp
, merges
[0]),
888 (unsigned long long)disk_stat_read(gp
, sectors
[0]),
889 jiffies_to_msecs(disk_stat_read(gp
, ticks
[0])),
890 disk_stat_read(gp
, ios
[1]), disk_stat_read(gp
, merges
[1]),
891 (unsigned long long)disk_stat_read(gp
, sectors
[1]),
892 jiffies_to_msecs(disk_stat_read(gp
, ticks
[1])),
894 jiffies_to_msecs(disk_stat_read(gp
, io_ticks
)),
895 jiffies_to_msecs(disk_stat_read(gp
, time_in_queue
)));
897 /* now show all non-0 size partitions of it */
898 disk_part_iter_init(&piter
, gp
, 0);
899 while ((hd
= disk_part_iter_next(&piter
))) {
900 cpu
= disk_stat_lock();
901 part_round_stats(cpu
, hd
);
903 seq_printf(seqf
, "%4d %7d %s %lu %lu %llu "
904 "%u %lu %lu %llu %u %u %u %u\n",
905 MAJOR(part_devt(hd
)), MINOR(part_devt(hd
)),
906 disk_name(gp
, hd
->partno
, buf
),
907 part_stat_read(hd
, ios
[0]),
908 part_stat_read(hd
, merges
[0]),
909 (unsigned long long)part_stat_read(hd
, sectors
[0]),
910 jiffies_to_msecs(part_stat_read(hd
, ticks
[0])),
911 part_stat_read(hd
, ios
[1]),
912 part_stat_read(hd
, merges
[1]),
913 (unsigned long long)part_stat_read(hd
, sectors
[1]),
914 jiffies_to_msecs(part_stat_read(hd
, ticks
[1])),
916 jiffies_to_msecs(part_stat_read(hd
, io_ticks
)),
917 jiffies_to_msecs(part_stat_read(hd
, time_in_queue
))
920 disk_part_iter_exit(&piter
);
925 const struct seq_operations diskstats_op
= {
926 .start
= disk_seqf_start
,
927 .next
= disk_seqf_next
,
928 .stop
= disk_seqf_stop
,
929 .show
= diskstats_show
931 #endif /* CONFIG_PROC_FS */
933 static void media_change_notify_thread(struct work_struct
*work
)
935 struct gendisk
*gd
= container_of(work
, struct gendisk
, async_notify
);
936 char event
[] = "MEDIA_CHANGE=1";
937 char *envp
[] = { event
, NULL
};
940 * set enviroment vars to indicate which event this is for
941 * so that user space will know to go check the media status.
943 kobject_uevent_env(&gd
->dev
.kobj
, KOBJ_CHANGE
, envp
);
944 put_device(gd
->driverfs_dev
);
948 void genhd_media_change_notify(struct gendisk
*disk
)
950 get_device(disk
->driverfs_dev
);
951 schedule_work(&disk
->async_notify
);
953 EXPORT_SYMBOL_GPL(genhd_media_change_notify
);
956 dev_t
blk_lookup_devt(const char *name
, int partno
)
958 dev_t devt
= MKDEV(0, 0);
959 struct class_dev_iter iter
;
962 class_dev_iter_init(&iter
, &block_class
, NULL
, &disk_type
);
963 while ((dev
= class_dev_iter_next(&iter
))) {
964 struct gendisk
*disk
= dev_to_disk(dev
);
966 if (strcmp(dev
->bus_id
, name
))
968 if (partno
< 0 || partno
> disk_max_parts(disk
))
972 devt
= disk_devt(disk
);
974 struct hd_struct
*part
;
976 part
= disk_get_part(disk
, partno
);
977 if (!part
|| !part
->nr_sects
) {
982 devt
= part_devt(part
);
987 class_dev_iter_exit(&iter
);
990 EXPORT_SYMBOL(blk_lookup_devt
);
992 struct gendisk
*alloc_disk(int minors
)
994 return alloc_disk_node(minors
, -1);
997 struct gendisk
*alloc_disk_node(int minors
, int node_id
)
999 return alloc_disk_ext_node(minors
, 0, node_id
);
1002 struct gendisk
*alloc_disk_ext(int minors
, int ext_minors
)
1004 return alloc_disk_ext_node(minors
, ext_minors
, -1);
1007 struct gendisk
*alloc_disk_ext_node(int minors
, int ext_minors
, int node_id
)
1009 struct gendisk
*disk
;
1011 disk
= kmalloc_node(sizeof(struct gendisk
),
1012 GFP_KERNEL
| __GFP_ZERO
, node_id
);
1014 int tot_minors
= minors
+ ext_minors
;
1016 if (!init_disk_stats(disk
)) {
1020 if (tot_minors
> 1) {
1021 int size
= (tot_minors
- 1) * sizeof(struct hd_struct
*);
1022 disk
->__part
= kmalloc_node(size
,
1023 GFP_KERNEL
| __GFP_ZERO
, node_id
);
1024 if (!disk
->__part
) {
1025 free_disk_stats(disk
);
1030 disk
->minors
= minors
;
1031 disk
->ext_minors
= ext_minors
;
1032 rand_initialize_disk(disk
);
1033 disk
->dev
.class = &block_class
;
1034 disk
->dev
.type
= &disk_type
;
1035 device_initialize(&disk
->dev
);
1036 INIT_WORK(&disk
->async_notify
,
1037 media_change_notify_thread
);
1042 EXPORT_SYMBOL(alloc_disk
);
1043 EXPORT_SYMBOL(alloc_disk_node
);
1044 EXPORT_SYMBOL(alloc_disk_ext
);
1045 EXPORT_SYMBOL(alloc_disk_ext_node
);
1047 struct kobject
*get_disk(struct gendisk
*disk
)
1049 struct module
*owner
;
1050 struct kobject
*kobj
;
1054 owner
= disk
->fops
->owner
;
1055 if (owner
&& !try_module_get(owner
))
1057 kobj
= kobject_get(&disk
->dev
.kobj
);
1066 EXPORT_SYMBOL(get_disk
);
1068 void put_disk(struct gendisk
*disk
)
1071 kobject_put(&disk
->dev
.kobj
);
1074 EXPORT_SYMBOL(put_disk
);
1076 void set_device_ro(struct block_device
*bdev
, int flag
)
1078 if (bdev
->bd_contains
!= bdev
)
1079 bdev
->bd_part
->policy
= flag
;
1081 bdev
->bd_disk
->policy
= flag
;
1084 EXPORT_SYMBOL(set_device_ro
);
1086 void set_disk_ro(struct gendisk
*disk
, int flag
)
1088 struct disk_part_iter piter
;
1089 struct hd_struct
*part
;
1091 disk
->policy
= flag
;
1092 disk_part_iter_init(&piter
, disk
, DISK_PITER_INCL_EMPTY
);
1093 while ((part
= disk_part_iter_next(&piter
)))
1094 part
->policy
= flag
;
1095 disk_part_iter_exit(&piter
);
1098 EXPORT_SYMBOL(set_disk_ro
);
1100 int bdev_read_only(struct block_device
*bdev
)
1104 else if (bdev
->bd_contains
!= bdev
)
1105 return bdev
->bd_part
->policy
;
1107 return bdev
->bd_disk
->policy
;
1110 EXPORT_SYMBOL(bdev_read_only
);
1112 int invalidate_partition(struct gendisk
*disk
, int partno
)
1115 struct block_device
*bdev
= bdget_disk(disk
, partno
);
1118 res
= __invalidate_device(bdev
);
1124 EXPORT_SYMBOL(invalidate_partition
);