Avoid bloating gendisk structure by storing per-device trigger data in
ledtrig_blkdev_disk
Support many-to-many device/LED associations with ledtrig_blkdev_link
struct. Per-device (ledtrig_blkdev_disk) and per-LED (ledtrig_blkdev_led)
structures both include a list of links, so a device can be linked to
multiple LEDs, and an LED can be linked to multiple devices.
Signed-off-by: Ian Pilcher <arequipeno@xxxxxxxxx>
---
drivers/leds/trigger/ledtrig-blkdev.c | 44 +++++++++++++++++++++++++++
1 file changed, 44 insertions(+)
diff --git a/drivers/leds/trigger/ledtrig-blkdev.c b/drivers/leds/trigger/ledtrig-blkdev.c
index 7f85e6080ea1..38a2cd2df85c 100644
--- a/drivers/leds/trigger/ledtrig-blkdev.c
+++ b/drivers/leds/trigger/ledtrig-blkdev.c
@@ -15,3 +15,47 @@ MODULE_DESCRIPTION("Block device LED trigger");
MODULE_AUTHOR("Ian Pilcher <arequipeno@xxxxxxxxx>");
MODULE_LICENSE("GPL v2");
MODULE_IMPORT_NS(LEDTRIG_BLKDEV);
+
+/* Default blink time & check interval (milliseconds) */
+#define LEDTRIG_BLKDEV_BLINK_MSEC 75
+#define LEDTRIG_BLKDEV_INTERVAL 100
+
+/* Minimum blink time & check interval (milliseconds) */
+#define LEDTRIG_BLKDEV_MIN_BLINK 10
+#define LEDTRIG_BLKDEV_MIN_INT 25
+
+enum ledtrig_blkdev_mode {
+ LEDTRIG_BLKDEV_MODE_RO = 0, /* blink for reads */
+ LEDTRIG_BLKDEV_MODE_WO = 1, /* blink for writes */
+ LEDTRIG_BLKDEV_MODE_RW = 2 /* blink for reads and writes */
+};
+
+/* Per-block device information */
+struct ledtrig_blkdev_disk {
+ struct gendisk *gd;
+ struct kobject *dir; /* linked_leds dir */
+ struct hlist_head leds;
+ unsigned long read_ios;
+ unsigned long write_ios;
+ unsigned int generation;
+ bool read_act;
+ bool write_act;
+};
+
+/* For many-to-many relationships between "disks" (block devices) and LEDs */
+struct ledtrig_blkdev_link {
+ struct hlist_node disk_leds_node;
+ struct hlist_node led_disks_node;
+ struct ledtrig_blkdev_disk *disk;
+ struct ledtrig_blkdev_led *led;
+};
+
+/* Every LED associated with the blkdev trigger gets one of these */
+struct ledtrig_blkdev_led {
+ struct kobject *dir; /* linked_devices dir */
+ struct led_classdev *led_dev;
+ unsigned int blink_msec;
+ struct hlist_head disks; /* linked block devs */
+ struct hlist_node leds_node;
+ enum ledtrig_blkdev_mode mode;
+};
--
2.31.1
