1Disk driver ioctls 2================== 3 4Here is a list of ioctls usually implemented by disk devices. 5 6B_GET_DEVICE_SIZE 7----------------- 8 9The parameter is a size_t and is filled with the disk size in bytes. 10This is limited to 4GB and not very useful. B_GET_GEOMETRY is used instead. 11 12B_GET_GEOMETRY 13-------------- 14 15The parameter is a device_geometry structure to be filled with the device geometry. 16 17B_GET_ICON_NAME 18--------------- 19 20Deprecated. Get the name of an icon to use. The icons are hardcoded in Tracker. 21 22B_GET_VECTOR_ICON 23----------------- 24 25The parameter is a device_icon structure to be populated with the icon data in HVIF format. 26This icon is then used to show the disk in Tracker, for example. 27 28B_EJECT_DEVICE 29-------------- 30 31Eject the device (for removable devices). 32 33B_LOAD_MEDIA 34------------ 35 36Load the device (reverse of eject) if possible. 37 38B_FLUSH_DRIVE_CACHE 39------------------- 40 41Make sure all data is stored on persistent storage and not in caches (including any caching inside 42the device) 43 44B_TRIM_DEVICE 45------------- 46 47The parameter is an fs_trim_data structure. It is guaranteed to be in kernel memory because 48the partition manager pre-processes requests coming from userland and makes sure no sectors 49are outside the partition range for a specific partition device. 50 51Mark the listed areas on disk as unused, allowing future reads to these areas to return 52random data or read errors. Flash memory devices (SSD, MMC, ...) may use this information 53to optimize their internal storage. 54