Link to a specific inode

Question

I have a file that was deleted, but is still held open my a program. I found the inode number using lsof. How can I create a hard link back to that inode?

Any code helps, but Perl would be handy.

Answer 1

Copy from /proc/ pid /fd/ file descriptor

Use lsof to find the pid and the file descriptor.

Answer 2

on EXT filesystem you can use debugfs command to recreate the link like :

debugfs -w /dev/mapper/vg0-root -R 'link <16> myfile'

Which will create a "file" named myfile and pointing to inode 16.