From 3b210e7652a0ac638b1a267b6a181c8f742d8462 Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Wed, 10 Nov 2010 10:05:52 +0100 Subject: [PATCH] [S390] tape: add medium state notifications Add uevent notifications for tape cartridge load and tape cartridge unload events. Signed-off-by: Martin Schwidefsky --- drivers/s390/char/tape_core.c | 68 +++++++++++++++++++++++++++++++++++++------ 1 file changed, 59 insertions(+), 9 deletions(-) diff --git a/drivers/s390/char/tape_core.c b/drivers/s390/char/tape_core.c index 6c40867..b3a3e8e 100644 --- a/drivers/s390/char/tape_core.c +++ b/drivers/s390/char/tape_core.c @@ -209,29 +209,79 @@ tape_state_set(struct tape_device *device, enum tape_state newstate) wake_up(&device->state_change_wq); } +struct tape_med_state_work_data { + struct tape_device *device; + enum tape_medium_state state; + struct work_struct work; +}; + +static void +tape_med_state_work_handler(struct work_struct *work) +{ + static char env_state_loaded[] = "MEDIUM_STATE=LOADED"; + static char env_state_unloaded[] = "MEDIUM_STATE=UNLOADED"; + struct tape_med_state_work_data *p = + container_of(work, struct tape_med_state_work_data, work); + struct tape_device *device = p->device; + char *envp[] = { NULL, NULL }; + + switch (p->state) { + case MS_UNLOADED: + pr_info("%s: The tape cartridge has been successfully " + "unloaded\n", dev_name(&device->cdev->dev)); + envp[0] = env_state_unloaded; + kobject_uevent_env(&device->cdev->dev.kobj, KOBJ_CHANGE, envp); + break; + case MS_LOADED: + pr_info("%s: A tape cartridge has been mounted\n", + dev_name(&device->cdev->dev)); + envp[0] = env_state_loaded; + kobject_uevent_env(&device->cdev->dev.kobj, KOBJ_CHANGE, envp); + break; + default: + break; + } + tape_put_device(device); + kfree(p); +} + +static void +tape_med_state_work(struct tape_device *device, enum tape_medium_state state) +{ + struct tape_med_state_work_data *p; + + p = kzalloc(sizeof(*p), GFP_ATOMIC); + if (p) { + INIT_WORK(&p->work, tape_med_state_work_handler); + p->device = tape_get_device(device); + p->state = state; + schedule_work(&p->work); + } +} + void tape_med_state_set(struct tape_device *device, enum tape_medium_state newstate) { - if (device->medium_state == newstate) + enum tape_medium_state oldstate; + + oldstate = device->medium_state; + if (oldstate == newstate) return; + device->medium_state = newstate; switch(newstate){ case MS_UNLOADED: device->tape_generic_status |= GMT_DR_OPEN(~0); - if (device->medium_state == MS_LOADED) - pr_info("%s: The tape cartridge has been successfully " - "unloaded\n", dev_name(&device->cdev->dev)); + if (oldstate == MS_LOADED) + tape_med_state_work(device, MS_UNLOADED); break; case MS_LOADED: device->tape_generic_status &= ~GMT_DR_OPEN(~0); - if (device->medium_state == MS_UNLOADED) - pr_info("%s: A tape cartridge has been mounted\n", - dev_name(&device->cdev->dev)); + if (oldstate == MS_UNLOADED) + tape_med_state_work(device, MS_LOADED); break; default: - // print nothing break; } - device->medium_state = newstate; wake_up(&device->state_change_wq); } -- 2.7.4