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?
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.
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