Dear Lazyweb. Open by inode.
Jan. 8th, 2008 01:38 pm![[personal profile]](http://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
fallenpegasusFor the past twenty years, I've always assumed that, given knowledge of a file's inode number, there was some efficient way to open(2) that file by inode instead of name, and I've just never felt the need to use it.
Now I feel the desire to do that, and cannot find how. Searching google for "open by inode" just gives me references to stuff on how to implement Linux VFS, and/or how to open a file from inside kernel space, not from user space.
The openat(2) looks like a half-assed way to get some but not all of the same optimization.
So, is there a way to "open by inode" from user space, and how do I do it?
Now I feel the desire to do that, and cannot find how. Searching google for "open by inode" just gives me references to stuff on how to implement Linux VFS, and/or how to open a file from inside kernel space, not from user space.
The openat(2) looks like a half-assed way to get some but not all of the same optimization.
So, is there a way to "open by inode" from user space, and how do I do it?
