Hello! > Hello, > Can you explain this code segment? > > oldfs = get_fs(); set_fs(KERNEL_DS); > err = file.f_op->read(&file, buf, *count, &file.f_pos); > set_fs(oldfs); > > What is the functionality of get_fs() and set_fs(). I think, it saves and restores the FS register to a variable. [in ix86 systems] FS is an extra segment register. KERNEL_DS is the KERNEL data segment, with IOPL 0, so you can access it only in kernelspace. Axt Attila [http://axt.load.hu] - Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ IRC Channel: irc.openprojects.net / #kernelnewbies Web Page: http://www.kernelnewbies.org/
