From fc39d5fc4500c512bd7e0427000f72b324486e5e Mon Sep 17 00:00:00 2001 From: Matthias Badaire Date: Wed, 16 May 2018 00:07:37 +0200 Subject: [PATCH] fstools: media change detection (eg:sdcard) using kernel polling Linux kernel has a polling mechanism that can be activated by changing the parameter /sys/module/block/parameters/events_dfl_poll_msecs which is deactivated by default or the /sys/block/[device]/events_poll_msecs for one device. This patch set the events_poll_msecs when a disk is inserted. Once the media disk change event is sent by the kernel then we force a re-read of the devices using /sbin/block info. With this patch, insertion and ejection of sd card will automatically generate partition devices in /dev. Signed-off-by: Matthias Badaire [rewrap commit message, fix bashisms, fix non-matching condition, bump pkg release] Signed-off-by: Jo-Philipp Wich (cherry picked from commit cf8483cb4ffc99bf3f512bb134860ccc8c099abe) --- package/system/fstools/Makefile | 3 ++- package/system/fstools/files/media-change.hotplug | 8 ++++++++ 2 files changed, 10 insertions(+), 1 deletion(-) create mode 100644 package/system/fstools/files/media-change.hotplug diff --git a/package/system/fstools/Makefile b/package/system/fstools/Makefile index 58be215f8f..60ccf09e11 100644 --- a/package/system/fstools/Makefile +++ b/package/system/fstools/Makefile @@ -8,7 +8,7 @@ include $(TOPDIR)/rules.mk PKG_NAME:=fstools -PKG_RELEASE:=3 +PKG_RELEASE:=4 PKG_SOURCE_PROTO:=git PKG_SOURCE_URL=$(PROJECT_GIT)/project/fstools.git @@ -110,6 +110,7 @@ define Package/block-mount/install $(INSTALL_BIN) ./files/fstab.init $(1)/etc/init.d/fstab $(INSTALL_CONF) ./files/fstab.default $(1)/etc/uci-defaults/10-fstab $(INSTALL_CONF) ./files/mount.hotplug $(1)/etc/hotplug.d/block/10-mount + $(INSTALL_CONF) ./files/media-change.hotplug $(1)/etc/hotplug.d/block/00-media-change $(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/sbin/block $(1)/sbin/ $(INSTALL_DATA) $(PKG_INSTALL_DIR)/usr/lib/libblkid-tiny.so $(1)/lib/ diff --git a/package/system/fstools/files/media-change.hotplug b/package/system/fstools/files/media-change.hotplug new file mode 100644 index 0000000000..30fc3d5c4f --- /dev/null +++ b/package/system/fstools/files/media-change.hotplug @@ -0,0 +1,8 @@ +[ -n "$DISK_MEDIA_CHANGE" ] && /sbin/block info + +if [ "$ACTION" = "add" -a "$DEVTYPE" = "disk" ]; then + case "$DEVNAME" in + mtd*) : ;; + *) echo 2000 > /sys/block/$DEVNAME/events_poll_msecs ;; + esac +fi -- 2.30.2