HI,
I am writing char device driver and get int troubles while compiling module with gcc -c test.c.

Error reported from compiler is: error:
func1.c:181: error: variable ‘fops’ has initializer but incomplete type
func1.c:182: error: unknown field ‘read’ specified in initializer
func1.c:182: warning: excess elements in struct initializer
func1.c:182: warning: (near initialization for ‘fops’)
func1.c:183: error: unknown field ‘write’ specified in initializer
func1.c:183: warning: excess elements in struct initializer
func1.c:183: warning: (near initialization for ‘fops’)
func1.c:184: error: unknown field ‘open’ specified in initializer
func1.c:184: warning: excess elements in struct initializer
func1.c:184: warning: (near initialization for ‘fops’)
func1.c:185: error: unknown field ‘release’ specified in initializer
func1.c:185: warning: excess elements in struct initializer
func1.c:185: warning: (near initialization for ‘fops’)
func1.c:186: error: unknown field ‘ioctl’ specified in initializer
func1.c:187: warning: excess elements in struct initializer
func1.c:187: warning: (near initialization for ‘fops’)


source code :::::::::::::::

struct file_operations fops = {
.read = readf,
.write =writef,
.open = openf,
.release = releasef,
.ioctl = ioctlf
};

A couple points:

1. You have to have the correct headers included so that struct file_operations is declared.
2. You should use a kernel Makefile so that the appropriate headers are in the include path. Instructions for doing this are in any up-to-date linux 2.6 kernel module guide or howto.