Allow block/genhd to notify user space 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 if the current capacity or the target capacity is not zero. Background: As a part of a patch to allow sending the RESIZE event on disk capacity change, Christoph (hch@xxxxxx) requested that the patch be made generic and the hacks for virtio block and xen block devices be removed and merged via a generic helper. This series consists of 5 changes. The first one adds the basic support for changing the size and notifying. The follow up patches are per block subsystem changes. Other block drivers can add their changes as necessary on top of this series. Testing: 1. I did some basic testing with an NVME device, by resizing it in the backend and ensured that udevd received the event. NOTE: After these changes, the notification might happen before revalidate disk, where as it occured later before. Balbir Singh (5): block/genhd: Notify udev about capacity change drivers/block/virtio_blk.c: Convert to use disk_set_capacity drivers/block/xen-blkfront.c: Convert to use disk_set_capacity drivers/nvme/host/core.c: Convert to use disk_set_capacity drivers/scsi/sd.c: Convert to use disk_set_capacity block/genhd.c | 19 +++++++++++++++++++ drivers/block/virtio_blk.c | 4 +--- drivers/block/xen-blkfront.c | 5 +---- drivers/nvme/host/core.c | 2 +- drivers/scsi/sd.c | 2 +- include/linux/genhd.h | 1 + 6 files changed, 24 insertions(+), 9 deletions(-) -- 2.16.5
