About file operation in linux kernel

Question

I have a question about the how the file_operations in the struct file is defined in linux kernel

vfs_read() calls

ret = file->f_op->read(file, buf, count, pos);

I know this read is a function pointer, which is defined in some driver code, but is there a way to find where it is actually defined?

Answer 1

VFS is "virtual file system". It is an abstraction over the underlying file system details, which of course differ greatly.

f_op is a set of file_operations that depend on which file system file is using.

For example, look at ext2_file_operations, where the ext2 filesystem exposes to the kernel which functions to use for its file operations.

If you want to see more, look for references to struct file_operations in the fs/ directory.