From: Goffredo Baroncelli <[email protected]> Update the header to add the BTRFS_IOC_DEV_PROPERTIES ioctl: - add ioctl BTRFS_IOC_DEV_PROPERTIES define - add struct btrfs_ioctl_dev_properties - add the BTRFS_DEV_PROPERTY_ define
This ioctl is a base for returning / setting information from / to the fields of the btrfs_dev_item object. For now only the "type" field is returned / set. Signed-off-by: Goffredo Baroncelli <[email protected]> --- ioctl.h | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/ioctl.h b/ioctl.h index ade6dcb9..a4febb95 100644 --- a/ioctl.h +++ b/ioctl.h @@ -775,6 +775,44 @@ struct btrfs_ioctl_get_subvol_rootref_args { }; BUILD_ASSERT(sizeof(struct btrfs_ioctl_get_subvol_rootref_args) == 4096); +#define BTRFS_DEV_PROPERTY_TYPE (1ULL << 0) +#define BTRFS_DEV_PROPERTY_DEV_GROUP (1ULL << 1) +#define BTRFS_DEV_PROPERTY_SEEK_SPEED (1ULL << 2) +#define BTRFS_DEV_PROPERTY_BANDWIDTH (1ULL << 3) +#define BTRFS_DEV_PROPERTY_READ (1ULL << 60) + +/* + * The ioctl BTRFS_IOC_DEV_PROPERTIES can read and write the device properties. + * + * The properties that the user want to write have to be set + * in the 'properties' field using the BTRFS_DEV_PROPERTY_xxxx constants. + * + * If the ioctl is used to read the device properties, the bit + * BTRFS_DEV_PROPERTY_READ has to be set in the 'properties' field. + * In this case the properties that the user want have to be set in the + * 'properties' field. The kernel doesn't return a property that was not + * required, however it may return a subset of the requested properties. + * The returned properties have the corrispondent BTRFS_DEV_PROPERTY_xxxx + * flag set in the 'properties' field. + * + * Up to 2020年05月11日 the only properties that can be read/write is the 'type' + * one. + */ +struct btrfs_ioctl_dev_properties { + __u64 devid; + __u64 properties; + __u64 type; + __u32 dev_group; + __u8 seek_speed; + __u8 bandwidth; + + /* + * for future expansion + */ + __u8 unused1[2]; + __u64 unused2[4]; +}; + /* Error codes as returned by the kernel */ enum btrfs_err_code { notused, @@ -949,6 +987,8 @@ static inline char *btrfs_err_str(enum btrfs_err_code err_code) struct btrfs_ioctl_ino_lookup_user_args) #define BTRFS_IOC_SNAP_DESTROY_V2 _IOW(BTRFS_IOCTL_MAGIC, 63, \ struct btrfs_ioctl_vol_args_v2) +#define BTRFS_IOC_DEV_PROPERTIES _IOW(BTRFS_IOCTL_MAGIC, 64, \ + struct btrfs_ioctl_dev_properties) #ifdef __cplusplus } -- 2.30.0