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_mangle_minor - scatter minor numbers apart
303 * @minor: minor number to mangle
305 * Scatter consecutively allocated @minor number apart if MANGLE_DEVT
306 * is enabled. Mangling twice gives the original value.
314 static int blk_mangle_minor(int minor
)
316 #ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT
319 for (i
= 0; i
< MINORBITS
/ 2; i
++) {
320 int low
= minor
& (1 << i
);
321 int high
= minor
& (1 << (MINORBITS
- 1 - i
));
322 int distance
= MINORBITS
- 1 - 2 * i
;
324 minor
^= low
| high
; /* clear both bits */
325 low
<<= distance
; /* swap the positions */
327 minor
|= low
| high
; /* and set */
334 * blk_alloc_devt - allocate a dev_t for a partition
335 * @part: partition to allocate dev_t for
336 * @gfp_mask: memory allocation flag
337 * @devt: out parameter for resulting dev_t
339 * Allocate a dev_t for block device.
342 * 0 on success, allocated dev_t is returned in *@devt. -errno on
348 int blk_alloc_devt(struct hd_struct
*part
, dev_t
*devt
)
350 struct gendisk
*disk
= part_to_disk(part
);
353 /* in consecutive minor range? */
354 if (part
->partno
< disk
->minors
) {
355 *devt
= MKDEV(disk
->major
, disk
->first_minor
+ part
->partno
);
359 /* allocate ext devt */
361 if (!idr_pre_get(&ext_devt_idr
, GFP_KERNEL
))
363 rc
= idr_get_new(&ext_devt_idr
, part
, &idx
);
364 } while (rc
== -EAGAIN
);
369 if (idx
> MAX_EXT_DEVT
) {
370 idr_remove(&ext_devt_idr
, idx
);
374 *devt
= MKDEV(BLOCK_EXT_MAJOR
, blk_mangle_minor(idx
));
379 * blk_free_devt - free a dev_t
380 * @devt: dev_t to free
382 * Free @devt which was allocated using blk_alloc_devt().
387 void blk_free_devt(dev_t devt
)
391 if (devt
== MKDEV(0, 0))
394 if (MAJOR(devt
) == BLOCK_EXT_MAJOR
) {
395 mutex_lock(&ext_devt_mutex
);
396 idr_remove(&ext_devt_idr
, blk_mangle_minor(MINOR(devt
)));
397 mutex_unlock(&ext_devt_mutex
);
401 static char *bdevt_str(dev_t devt
, char *buf
)
403 if (MAJOR(devt
) <= 0xff && MINOR(devt
) <= 0xff) {
404 char tbuf
[BDEVT_SIZE
];
405 snprintf(tbuf
, BDEVT_SIZE
, "%02x%02x", MAJOR(devt
), MINOR(devt
));
406 snprintf(buf
, BDEVT_SIZE
, "%-9s", tbuf
);
408 snprintf(buf
, BDEVT_SIZE
, "%03x:%05x", MAJOR(devt
), MINOR(devt
));
414 * Register device numbers dev..(dev+range-1)
415 * range must be nonzero
416 * The hash chain is sorted on range, so that subranges can override.
418 void blk_register_region(dev_t devt
, unsigned long range
, struct module
*module
,
419 struct kobject
*(*probe
)(dev_t
, int *, void *),
420 int (*lock
)(dev_t
, void *), void *data
)
422 kobj_map(bdev_map
, devt
, range
, module
, probe
, lock
, data
);
425 EXPORT_SYMBOL(blk_register_region
);
427 void blk_unregister_region(dev_t devt
, unsigned long range
)
429 kobj_unmap(bdev_map
, devt
, range
);
432 EXPORT_SYMBOL(blk_unregister_region
);
434 static struct kobject
*exact_match(dev_t devt
, int *partno
, void *data
)
436 struct gendisk
*p
= data
;
441 static int exact_lock(dev_t devt
, void *data
)
443 struct gendisk
*p
= data
;
451 * add_disk - add partitioning information to kernel list
452 * @disk: per-device partitioning information
454 * This function registers the partitioning information in @disk
457 void add_disk(struct gendisk
*disk
)
459 struct backing_dev_info
*bdi
;
462 disk
->flags
|= GENHD_FL_UP
;
463 disk
->dev
.devt
= MKDEV(disk
->major
, disk
->first_minor
);
464 blk_register_region(disk_devt(disk
), disk
->minors
, NULL
,
465 exact_match
, exact_lock
, disk
);
467 blk_register_queue(disk
);
469 bdi
= &disk
->queue
->backing_dev_info
;
470 bdi_register_dev(bdi
, disk_devt(disk
));
471 retval
= sysfs_create_link(&disk
->dev
.kobj
, &bdi
->dev
->kobj
, "bdi");
475 EXPORT_SYMBOL(add_disk
);
476 EXPORT_SYMBOL(del_gendisk
); /* in partitions/check.c */
478 void unlink_gendisk(struct gendisk
*disk
)
480 sysfs_remove_link(&disk
->dev
.kobj
, "bdi");
481 bdi_unregister(&disk
->queue
->backing_dev_info
);
482 blk_unregister_queue(disk
);
483 blk_unregister_region(disk_devt(disk
), disk
->minors
);
487 * get_gendisk - get partitioning information for a given device
488 * @devt: device to get partitioning information for
489 * @part: returned partition index
491 * This function gets the structure containing partitioning
492 * information for the given device @devt.
494 struct gendisk
*get_gendisk(dev_t devt
, int *partno
)
496 struct gendisk
*disk
= NULL
;
498 if (MAJOR(devt
) != BLOCK_EXT_MAJOR
) {
499 struct kobject
*kobj
;
501 kobj
= kobj_lookup(bdev_map
, devt
, partno
);
503 disk
= dev_to_disk(kobj_to_dev(kobj
));
505 struct hd_struct
*part
;
507 mutex_lock(&ext_devt_mutex
);
508 part
= idr_find(&ext_devt_idr
, blk_mangle_minor(MINOR(devt
)));
509 if (part
&& get_disk(part_to_disk(part
))) {
510 *partno
= part
->partno
;
511 disk
= part_to_disk(part
);
513 mutex_unlock(&ext_devt_mutex
);
520 * bdget_disk - do bdget() by gendisk and partition number
521 * @disk: gendisk of interest
522 * @partno: partition number
524 * Find partition @partno from @disk, do bdget() on it.
530 * Resulting block_device on success, NULL on failure.
532 extern struct block_device
*bdget_disk(struct gendisk
*disk
, int partno
)
534 dev_t devt
= MKDEV(0, 0);
537 devt
= disk_devt(disk
);
539 struct hd_struct
*part
;
541 part
= disk_get_part(disk
, partno
);
542 if (part
&& part
->nr_sects
)
543 devt
= part_devt(part
);
547 if (likely(devt
!= MKDEV(0, 0)))
551 EXPORT_SYMBOL(bdget_disk
);
554 * print a full list of all partitions - intended for places where the root
555 * filesystem can't be mounted and thus to give the victim some idea of what
558 void __init
printk_all_partitions(void)
560 struct class_dev_iter iter
;
563 class_dev_iter_init(&iter
, &block_class
, NULL
, &disk_type
);
564 while ((dev
= class_dev_iter_next(&iter
))) {
565 struct gendisk
*disk
= dev_to_disk(dev
);
566 struct disk_part_iter piter
;
567 struct hd_struct
*part
;
568 char name_buf
[BDEVNAME_SIZE
];
569 char devt_buf
[BDEVT_SIZE
];
572 * Don't show empty devices or things that have been
575 if (get_capacity(disk
) == 0 ||
576 (disk
->flags
& GENHD_FL_SUPPRESS_PARTITION_INFO
))
580 * Note, unlike /proc/partitions, I am showing the
581 * numbers in hex - the same format as the root=
584 printk("%s %10llu %s",
585 bdevt_str(disk_devt(disk
), devt_buf
),
586 (unsigned long long)get_capacity(disk
) >> 1,
587 disk_name(disk
, 0, name_buf
));
588 if (disk
->driverfs_dev
!= NULL
&&
589 disk
->driverfs_dev
->driver
!= NULL
)
590 printk(" driver: %s\n",
591 disk
->driverfs_dev
->driver
->name
);
593 printk(" (driver?)\n");
595 /* now show the partitions */
596 disk_part_iter_init(&piter
, disk
, 0);
597 while ((part
= disk_part_iter_next(&piter
)))
598 printk(" %s %10llu %s\n",
599 bdevt_str(part_devt(part
), devt_buf
),
600 (unsigned long long)part
->nr_sects
>> 1,
601 disk_name(disk
, part
->partno
, name_buf
));
602 disk_part_iter_exit(&piter
);
604 class_dev_iter_exit(&iter
);
607 #ifdef CONFIG_PROC_FS
609 static void *disk_seqf_start(struct seq_file
*seqf
, loff_t
*pos
)
612 struct class_dev_iter
*iter
;
615 iter
= kmalloc(GFP_KERNEL
, sizeof(*iter
));
617 return ERR_PTR(-ENOMEM
);
619 seqf
->private = iter
;
620 class_dev_iter_init(iter
, &block_class
, NULL
, &disk_type
);
622 dev
= class_dev_iter_next(iter
);
627 return dev_to_disk(dev
);
630 static void *disk_seqf_next(struct seq_file
*seqf
, void *v
, loff_t
*pos
)
635 dev
= class_dev_iter_next(seqf
->private);
637 return dev_to_disk(dev
);
642 static void disk_seqf_stop(struct seq_file
*seqf
, void *v
)
644 struct class_dev_iter
*iter
= seqf
->private;
646 /* stop is called even after start failed :-( */
648 class_dev_iter_exit(iter
);
653 static void *show_partition_start(struct seq_file
*seqf
, loff_t
*pos
)
657 p
= disk_seqf_start(seqf
, pos
);
659 seq_puts(seqf
, "major minor #blocks name\n\n");
663 static int show_partition(struct seq_file
*seqf
, void *v
)
665 struct gendisk
*sgp
= v
;
666 struct disk_part_iter piter
;
667 struct hd_struct
*part
;
668 char buf
[BDEVNAME_SIZE
];
670 /* Don't show non-partitionable removeable devices or empty devices */
671 if (!get_capacity(sgp
) || (!disk_max_parts(sgp
) &&
672 (sgp
->flags
& GENHD_FL_REMOVABLE
)))
674 if (sgp
->flags
& GENHD_FL_SUPPRESS_PARTITION_INFO
)
677 /* show the full disk and all non-0 size partitions of it */
678 seq_printf(seqf
, "%4d %7d %10llu %s\n",
679 MAJOR(disk_devt(sgp
)), MINOR(disk_devt(sgp
)),
680 (unsigned long long)get_capacity(sgp
) >> 1,
681 disk_name(sgp
, 0, buf
));
683 disk_part_iter_init(&piter
, sgp
, 0);
684 while ((part
= disk_part_iter_next(&piter
)))
685 seq_printf(seqf
, "%4d %7d %10llu %s\n",
686 MAJOR(part_devt(part
)), MINOR(part_devt(part
)),
687 (unsigned long long)part
->nr_sects
>> 1,
688 disk_name(sgp
, part
->partno
, buf
));
689 disk_part_iter_exit(&piter
);
694 const struct seq_operations partitions_op
= {
695 .start
= show_partition_start
,
696 .next
= disk_seqf_next
,
697 .stop
= disk_seqf_stop
,
698 .show
= show_partition
703 static struct kobject
*base_probe(dev_t devt
, int *partno
, void *data
)
705 if (request_module("block-major-%d-%d", MAJOR(devt
), MINOR(devt
)) > 0)
706 /* Make old-style 2.4 aliases work */
707 request_module("block-major-%d", MAJOR(devt
));
711 static int __init
genhd_device_init(void)
715 block_class
.dev_kobj
= sysfs_dev_block_kobj
;
716 error
= class_register(&block_class
);
719 bdev_map
= kobj_map_init(base_probe
, &block_class_lock
);
722 #ifndef CONFIG_SYSFS_DEPRECATED
723 /* create top-level block dir */
724 block_depr
= kobject_create_and_add("block", NULL
);
729 subsys_initcall(genhd_device_init
);
731 static ssize_t
disk_range_show(struct device
*dev
,
732 struct device_attribute
*attr
, char *buf
)
734 struct gendisk
*disk
= dev_to_disk(dev
);
736 return sprintf(buf
, "%d\n", disk
->minors
);
739 static ssize_t
disk_ext_range_show(struct device
*dev
,
740 struct device_attribute
*attr
, char *buf
)
742 struct gendisk
*disk
= dev_to_disk(dev
);
744 return sprintf(buf
, "%d\n", disk_max_parts(disk
) + 1);
747 static ssize_t
disk_removable_show(struct device
*dev
,
748 struct device_attribute
*attr
, char *buf
)
750 struct gendisk
*disk
= dev_to_disk(dev
);
752 return sprintf(buf
, "%d\n",
753 (disk
->flags
& GENHD_FL_REMOVABLE
? 1 : 0));
756 static ssize_t
disk_ro_show(struct device
*dev
,
757 struct device_attribute
*attr
, char *buf
)
759 struct gendisk
*disk
= dev_to_disk(dev
);
761 return sprintf(buf
, "%d\n", disk
->policy
? 1 : 0);
764 static ssize_t
disk_size_show(struct device
*dev
,
765 struct device_attribute
*attr
, char *buf
)
767 struct gendisk
*disk
= dev_to_disk(dev
);
769 return sprintf(buf
, "%llu\n", (unsigned long long)get_capacity(disk
));
772 static ssize_t
disk_capability_show(struct device
*dev
,
773 struct device_attribute
*attr
, char *buf
)
775 struct gendisk
*disk
= dev_to_disk(dev
);
777 return sprintf(buf
, "%x\n", disk
->flags
);
780 static ssize_t
disk_stat_show(struct device
*dev
,
781 struct device_attribute
*attr
, char *buf
)
783 struct gendisk
*disk
= dev_to_disk(dev
);
786 cpu
= disk_stat_lock();
787 disk_round_stats(cpu
, disk
);
790 "%8lu %8lu %8llu %8u "
791 "%8lu %8lu %8llu %8u "
794 disk_stat_read(disk
, ios
[READ
]),
795 disk_stat_read(disk
, merges
[READ
]),
796 (unsigned long long)disk_stat_read(disk
, sectors
[READ
]),
797 jiffies_to_msecs(disk_stat_read(disk
, ticks
[READ
])),
798 disk_stat_read(disk
, ios
[WRITE
]),
799 disk_stat_read(disk
, merges
[WRITE
]),
800 (unsigned long long)disk_stat_read(disk
, sectors
[WRITE
]),
801 jiffies_to_msecs(disk_stat_read(disk
, ticks
[WRITE
])),
803 jiffies_to_msecs(disk_stat_read(disk
, io_ticks
)),
804 jiffies_to_msecs(disk_stat_read(disk
, time_in_queue
)));
807 #ifdef CONFIG_FAIL_MAKE_REQUEST
808 static ssize_t
disk_fail_show(struct device
*dev
,
809 struct device_attribute
*attr
, char *buf
)
811 struct gendisk
*disk
= dev_to_disk(dev
);
813 return sprintf(buf
, "%d\n", disk
->flags
& GENHD_FL_FAIL
? 1 : 0);
816 static ssize_t
disk_fail_store(struct device
*dev
,
817 struct device_attribute
*attr
,
818 const char *buf
, size_t count
)
820 struct gendisk
*disk
= dev_to_disk(dev
);
823 if (count
> 0 && sscanf(buf
, "%d", &i
) > 0) {
825 disk
->flags
&= ~GENHD_FL_FAIL
;
827 disk
->flags
|= GENHD_FL_FAIL
;
835 static DEVICE_ATTR(range
, S_IRUGO
, disk_range_show
, NULL
);
836 static DEVICE_ATTR(ext_range
, S_IRUGO
, disk_ext_range_show
, NULL
);
837 static DEVICE_ATTR(removable
, S_IRUGO
, disk_removable_show
, NULL
);
838 static DEVICE_ATTR(ro
, S_IRUGO
, disk_ro_show
, NULL
);
839 static DEVICE_ATTR(size
, S_IRUGO
, disk_size_show
, NULL
);
840 static DEVICE_ATTR(capability
, S_IRUGO
, disk_capability_show
, NULL
);
841 static DEVICE_ATTR(stat
, S_IRUGO
, disk_stat_show
, NULL
);
842 #ifdef CONFIG_FAIL_MAKE_REQUEST
843 static struct device_attribute dev_attr_fail
=
844 __ATTR(make
-it
-fail
, S_IRUGO
|S_IWUSR
, disk_fail_show
, disk_fail_store
);
847 static struct attribute
*disk_attrs
[] = {
848 &dev_attr_range
.attr
,
849 &dev_attr_ext_range
.attr
,
850 &dev_attr_removable
.attr
,
853 &dev_attr_capability
.attr
,
855 #ifdef CONFIG_FAIL_MAKE_REQUEST
861 static struct attribute_group disk_attr_group
= {
865 static struct attribute_group
*disk_attr_groups
[] = {
870 static void disk_release(struct device
*dev
)
872 struct gendisk
*disk
= dev_to_disk(dev
);
876 free_disk_stats(disk
);
879 struct class block_class
= {
883 static struct device_type disk_type
= {
885 .groups
= disk_attr_groups
,
886 .release
= disk_release
,
889 #ifdef CONFIG_PROC_FS
891 * aggregate disk stat collector. Uses the same stats that the sysfs
892 * entries do, above, but makes them available through one seq_file.
894 * The output looks suspiciously like /proc/partitions with a bunch of
897 static int diskstats_show(struct seq_file
*seqf
, void *v
)
899 struct gendisk
*gp
= v
;
900 struct disk_part_iter piter
;
901 struct hd_struct
*hd
;
902 char buf
[BDEVNAME_SIZE
];
906 if (&gp->dev.kobj.entry == block_class.devices.next)
907 seq_puts(seqf, "major minor name"
908 " rio rmerge rsect ruse wio wmerge "
909 "wsect wuse running use aveq"
913 cpu
= disk_stat_lock();
914 disk_round_stats(cpu
, gp
);
916 seq_printf(seqf
, "%4d %7d %s %lu %lu %llu %u %lu %lu %llu %u %u %u %u\n",
917 MAJOR(disk_devt(gp
)), MINOR(disk_devt(gp
)),
918 disk_name(gp
, 0, buf
),
919 disk_stat_read(gp
, ios
[0]), disk_stat_read(gp
, merges
[0]),
920 (unsigned long long)disk_stat_read(gp
, sectors
[0]),
921 jiffies_to_msecs(disk_stat_read(gp
, ticks
[0])),
922 disk_stat_read(gp
, ios
[1]), disk_stat_read(gp
, merges
[1]),
923 (unsigned long long)disk_stat_read(gp
, sectors
[1]),
924 jiffies_to_msecs(disk_stat_read(gp
, ticks
[1])),
926 jiffies_to_msecs(disk_stat_read(gp
, io_ticks
)),
927 jiffies_to_msecs(disk_stat_read(gp
, time_in_queue
)));
929 /* now show all non-0 size partitions of it */
930 disk_part_iter_init(&piter
, gp
, 0);
931 while ((hd
= disk_part_iter_next(&piter
))) {
932 cpu
= disk_stat_lock();
933 part_round_stats(cpu
, hd
);
935 seq_printf(seqf
, "%4d %7d %s %lu %lu %llu "
936 "%u %lu %lu %llu %u %u %u %u\n",
937 MAJOR(part_devt(hd
)), MINOR(part_devt(hd
)),
938 disk_name(gp
, hd
->partno
, buf
),
939 part_stat_read(hd
, ios
[0]),
940 part_stat_read(hd
, merges
[0]),
941 (unsigned long long)part_stat_read(hd
, sectors
[0]),
942 jiffies_to_msecs(part_stat_read(hd
, ticks
[0])),
943 part_stat_read(hd
, ios
[1]),
944 part_stat_read(hd
, merges
[1]),
945 (unsigned long long)part_stat_read(hd
, sectors
[1]),
946 jiffies_to_msecs(part_stat_read(hd
, ticks
[1])),
948 jiffies_to_msecs(part_stat_read(hd
, io_ticks
)),
949 jiffies_to_msecs(part_stat_read(hd
, time_in_queue
))
952 disk_part_iter_exit(&piter
);
957 const struct seq_operations diskstats_op
= {
958 .start
= disk_seqf_start
,
959 .next
= disk_seqf_next
,
960 .stop
= disk_seqf_stop
,
961 .show
= diskstats_show
963 #endif /* CONFIG_PROC_FS */
965 static void media_change_notify_thread(struct work_struct
*work
)
967 struct gendisk
*gd
= container_of(work
, struct gendisk
, async_notify
);
968 char event
[] = "MEDIA_CHANGE=1";
969 char *envp
[] = { event
, NULL
};
972 * set enviroment vars to indicate which event this is for
973 * so that user space will know to go check the media status.
975 kobject_uevent_env(&gd
->dev
.kobj
, KOBJ_CHANGE
, envp
);
976 put_device(gd
->driverfs_dev
);
980 void genhd_media_change_notify(struct gendisk
*disk
)
982 get_device(disk
->driverfs_dev
);
983 schedule_work(&disk
->async_notify
);
985 EXPORT_SYMBOL_GPL(genhd_media_change_notify
);
988 dev_t
blk_lookup_devt(const char *name
, int partno
)
990 dev_t devt
= MKDEV(0, 0);
991 struct class_dev_iter iter
;
994 class_dev_iter_init(&iter
, &block_class
, NULL
, &disk_type
);
995 while ((dev
= class_dev_iter_next(&iter
))) {
996 struct gendisk
*disk
= dev_to_disk(dev
);
998 if (strcmp(dev
->bus_id
, name
))
1000 if (partno
< 0 || partno
> disk_max_parts(disk
))
1004 devt
= disk_devt(disk
);
1006 struct hd_struct
*part
;
1008 part
= disk_get_part(disk
, partno
);
1009 if (!part
|| !part
->nr_sects
) {
1010 disk_put_part(part
);
1014 devt
= part_devt(part
);
1015 disk_put_part(part
);
1019 class_dev_iter_exit(&iter
);
1022 EXPORT_SYMBOL(blk_lookup_devt
);
1024 struct gendisk
*alloc_disk(int minors
)
1026 return alloc_disk_node(minors
, -1);
1029 struct gendisk
*alloc_disk_node(int minors
, int node_id
)
1031 return alloc_disk_ext_node(minors
, 0, node_id
);
1034 struct gendisk
*alloc_disk_ext(int minors
, int ext_minors
)
1036 return alloc_disk_ext_node(minors
, ext_minors
, -1);
1039 struct gendisk
*alloc_disk_ext_node(int minors
, int ext_minors
, int node_id
)
1041 struct gendisk
*disk
;
1043 disk
= kmalloc_node(sizeof(struct gendisk
),
1044 GFP_KERNEL
| __GFP_ZERO
, node_id
);
1046 int tot_minors
= minors
+ ext_minors
;
1048 if (!init_disk_stats(disk
)) {
1052 if (tot_minors
> 1) {
1053 int size
= (tot_minors
- 1) * sizeof(struct hd_struct
*);
1054 disk
->__part
= kmalloc_node(size
,
1055 GFP_KERNEL
| __GFP_ZERO
, node_id
);
1056 if (!disk
->__part
) {
1057 free_disk_stats(disk
);
1062 disk
->minors
= minors
;
1063 disk
->ext_minors
= ext_minors
;
1064 rand_initialize_disk(disk
);
1065 disk
->dev
.class = &block_class
;
1066 disk
->dev
.type
= &disk_type
;
1067 device_initialize(&disk
->dev
);
1068 INIT_WORK(&disk
->async_notify
,
1069 media_change_notify_thread
);
1074 EXPORT_SYMBOL(alloc_disk
);
1075 EXPORT_SYMBOL(alloc_disk_node
);
1076 EXPORT_SYMBOL(alloc_disk_ext
);
1077 EXPORT_SYMBOL(alloc_disk_ext_node
);
1079 struct kobject
*get_disk(struct gendisk
*disk
)
1081 struct module
*owner
;
1082 struct kobject
*kobj
;
1086 owner
= disk
->fops
->owner
;
1087 if (owner
&& !try_module_get(owner
))
1089 kobj
= kobject_get(&disk
->dev
.kobj
);
1098 EXPORT_SYMBOL(get_disk
);
1100 void put_disk(struct gendisk
*disk
)
1103 kobject_put(&disk
->dev
.kobj
);
1106 EXPORT_SYMBOL(put_disk
);
1108 void set_device_ro(struct block_device
*bdev
, int flag
)
1110 if (bdev
->bd_contains
!= bdev
)
1111 bdev
->bd_part
->policy
= flag
;
1113 bdev
->bd_disk
->policy
= flag
;
1116 EXPORT_SYMBOL(set_device_ro
);
1118 void set_disk_ro(struct gendisk
*disk
, int flag
)
1120 struct disk_part_iter piter
;
1121 struct hd_struct
*part
;
1123 disk
->policy
= flag
;
1124 disk_part_iter_init(&piter
, disk
, DISK_PITER_INCL_EMPTY
);
1125 while ((part
= disk_part_iter_next(&piter
)))
1126 part
->policy
= flag
;
1127 disk_part_iter_exit(&piter
);
1130 EXPORT_SYMBOL(set_disk_ro
);
1132 int bdev_read_only(struct block_device
*bdev
)
1136 else if (bdev
->bd_contains
!= bdev
)
1137 return bdev
->bd_part
->policy
;
1139 return bdev
->bd_disk
->policy
;
1142 EXPORT_SYMBOL(bdev_read_only
);
1144 int invalidate_partition(struct gendisk
*disk
, int partno
)
1147 struct block_device
*bdev
= bdget_disk(disk
, partno
);
1150 res
= __invalidate_device(bdev
);
1156 EXPORT_SYMBOL(invalidate_partition
);