[resend v1 1/5] block/genhd: Notify udev about capacity change
From: Balbir Singh <hidden>
Date: 2020-01-02 07:53:45
Also in:
linux-nvme, lkml
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
Allow block/genhd to notify user space (via udev) about disk size changes using a new helper disk_set_capacity(), which is a wrapper on top of set_capacity(). disk_set_capacity() will only notify via udev if the current capacity or the target capacity is not zero. Suggested-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Someswarudu Sangaraju <redacted> Signed-off-by: Balbir Singh <redacted> --- block/genhd.c | 19 +++++++++++++++++++ include/linux/genhd.h | 1 + 2 files changed, 20 insertions(+)
diff --git a/block/genhd.c b/block/genhd.c
index ff6268970ddc..94faec98607b 100644
--- a/block/genhd.c
+++ b/block/genhd.c@@ -46,6 +46,25 @@ 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 disk_set_capacity(struct gendisk *disk, sector_t size) +{ + sector_t capacity = get_capacity(disk); + + set_capacity(disk, size); + if (capacity != 0 && size != 0) { + char *envp[] = { "RESIZE=1", NULL }; + + kobject_uevent_env(&disk_to_dev(disk)->kobj, KOBJ_CHANGE, envp); + } +} + +EXPORT_SYMBOL_GPL(disk_set_capacity); + + void part_inc_in_flight(struct request_queue *q, struct hd_struct *part, int rw) { if (queue_is_mq(q))
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index a927829bb73a..f1a5ddcc781d 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h@@ -449,6 +449,7 @@ 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 disk_set_capacity(struct gendisk *disk, sector_t size); extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask); /* drivers/char/random.c */
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2.16.5