VFS Operations - File Open

Given a file path, an open mode and a file permissions mask:

Entry function: sys_open, in fs/open.c.
Underlying open function: filp_open, in fs/open.c.

• Allocate a free file descriptor.
• Try to open the file (next slide).
• On success, put the new 'struct file' in the fd table of the process.
  On error, free the allocated file descriptor.

Originally written by guy keren