Commit e598a72f authored by Balbir Singh's avatar Balbir Singh Committed by Jens Axboe
Browse files

block/genhd: Notify udev about capacity change 



Allow block/genhd to notify user space (via udev) about disk size changes
using a new helper set_capacity_revalidate_and_notify(), which is a wrapper
on top of set_capacity(). set_capacity_revalidate_and_notify() will only
notify via udev if the current capacity or the target capacity is not zero
and iff the capacity changes.

Suggested-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarSomeswarudu Sangaraju <ssomesh@amazon.com>
Signed-off-by: default avatarBalbir Singh <sblbir@amazon.com>
Reviewed-by: default avatarBob Liu <bob.liu@oracle.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent de6a78b6

block/genhd.c

+24 −0
Original line number Diff line number Diff line
@@ -46,6 +46,30 @@ static void disk_add_events(struct gendisk *disk); 
static void disk_del_events(struct gendisk *disk);

static void disk_release_events(struct gendisk *disk);



/*

 * Set disk capacity and notify if the size is not currently

 * zero and will not be set to zero

 */

void set_capacity_revalidate_and_notify(struct gendisk *disk, sector_t size,

					bool revalidate)

{

	sector_t capacity = get_capacity(disk);



	set_capacity(disk, size);



	if (revalidate)

		revalidate_disk(disk);



	if (capacity != size && capacity != 0 && size != 0) {

		char *envp[] = { "RESIZE=1", NULL };



		kobject_uevent_env(&disk_to_dev(disk)->kobj, KOBJ_CHANGE, envp);

	}

}



EXPORT_SYMBOL_GPL(set_capacity_revalidate_and_notify);





void part_inc_in_flight(struct request_queue *q, struct hd_struct *part, int rw)

{

	if (queue_is_mq(q))

include/linux/genhd.h

+2 −0
Original line number Diff line number Diff line
@@ -508,6 +508,8 @@ static inline int get_disk_ro(struct gendisk *disk) 
extern void disk_block_events(struct gendisk *disk);

extern void disk_unblock_events(struct gendisk *disk);

extern void disk_flush_events(struct gendisk *disk, unsigned int mask);

extern void set_capacity_revalidate_and_notify(struct gendisk *disk,

			sector_t size, bool revalidate);

extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask);



/* drivers/char/random.c */

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