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authorMatthias Badaire <mbadaire@gmail.com>2018-05-16 00:07:37 +0200
committerJo-Philipp Wich <jo@mein.io>2019-01-22 08:49:36 +0100
commitcf8483cb4ffc99bf3f512bb134860ccc8c099abe (patch)
treef7fc64702a1044e79f3c28a283a9c9bbd0914d75
parent5a89eea8e49f576f0d5c7aaaaba1929c11589fdc (diff)
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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 <mbadaire@gmail.com> [rewrap commit message, fix bashisms, fix non-matching condition, bump pkg release] Signed-off-by: Jo-Philipp Wich <jo@mein.io>
-rw-r--r--package/system/fstools/Makefile3
-rw-r--r--package/system/fstools/files/media-change.hotplug8
2 files changed, 10 insertions, 1 deletions
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