On 19/02/2016 18:00, Karl Palsson wrote: > Hi, > > I'm trying to get "block mount" to behave well when a microSD > card is removed/inserted from a fixed USB card reader. I've > compiled the uevent-hotplug debugger example from > https://www.kernel.org/doc/pending/hotplug.txt and running that > on my device, I can see that "block info" is somehow triggering > the uevent change notifications I hope. (I can't see anywhere in > the fstools how the uevent is triggered, but it only happens if I > run "block info" manually, "blkid" doesn't trigger any events, so > it's something in block info > > Example event (unfortuntely it's identical for card inserted -> > removed and for removed -> inserted) > ``` > change@/devices/platform/ehci-platform/usb1/1-1/1-1.1/1-1.1:1.0/host0/target0:0:0/0:0:0:0/block/sda > ACTION=change > DEVPATH=/devices/platform/ehci-platform/usb1/1-1/1-1.1/1-1.1:1.0/host0/target0:0:0/0:0:0:0/block/sda > SUBSYSTEM=block DISK_MEDIA_CHANGE=1 MAJOR=8 MINOR=0 DEVNAME=sda > DEVTYPE=disk SEQNUM=637 > ``` >
fstools/libblkid-tiny/libblkid-tiny.c: probe_block() does an open() on the device node which will eventually end up inside drivers/scsi/sd.c: sd_open() which will call check_disk_change(bdev); and that triggers the uevent. i am not sure how you can get it to automatically send the event without polling it. _______________________________________________ openwrt-devel mailing list [email protected] https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
