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block/genhd: Notify udev about capacity change

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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: Christoph Hellwig <hch@lst.de>
Signed-off-by: Someswarudu Sangaraju <ssomesh@amazon.com>
Signed-off-by: Balbir Singh <sblbir@amazon.com>
Reviewed-by: Bob Liu <bob.liu@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Balbir Singh 2020-03-13 05:30:05 +00:00 committed by Jens Axboe
parent de6a78b601
commit e598a72fae
2 changed files with 26 additions and 0 deletions
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24
block/genhd.c
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@ -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))

2
include/linux/genhd.h
View File

@ -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 */