File handling in a kernel module. What is the appropriate way to 'seek' in a file? I could not find a sys_seek() function (such as sys_read()). Or, is it better only to use the VFS function API?
The question How to read/write files within a Linux kernel module? does not handle input stream navigation, i.e. there is no reference to tell()/seek() of any kind.
seek functionality in the kernel space can be achieved by vfs_llseek function:
loff_t vfs_llseek(struct file *file, loff_t offset, int whence);
The function returns resulted offset or negative value in case of error.