dd command file_operations involved?

Question

When we are executing dd command, which write function gets called. As per my understanding, dd command is not filesystem specific, so no file system's file_operations is involved. Please correct If I am wrong here.

I would like to know which file_operations is involved in carrying out dd operation?

Answer 1

That depends on what you write to.

Either it is a regular file and file system specific calls are used or it is a device and you eventually use to the target disk (or whatever) underlying driver.

http://www.makelinux.net/books/ulk3/understandlk-CHP-14-SECT-5#understandlk-CHP-14-SECT-5

Answer 2

The write system call does indeed end up invoking the file system specific write via the VFS layer. See the vfs_write function.