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#ifndef __IOCTL_ #define __IOCTL_ #include <linux/ioctl.h> #define BTRFS_IOCTL_MAGIC 0x94 #define BTRFS_VOL_NAME_MAX 255 struct btrfs_ioctl_vol_args { char name[BTRFS_VOL_NAME_MAX + 1]; }; #define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \ struct btrfs_ioctl_vol_args) #endif