On Thu, 28 Aug 2025 14:06:39 -0700
Linus Torvalds [off-list ref] wrote:

So you can certainly use siphash for hashing, but make sure to not use
the same secret key that the printing does.

Right, I just meant to use the same algorithm. The key would be different.

As to the ID to hash, I actually think a 'struct file *' might be the
best thing to use - that's directly in the vma, no need to follow any
other pointers for it.

But that's unique per task, right? What I liked about the f_inode
pointer, is that it appears to be shared between tasks.

I only want to add a new hash and print the path for a new file. If
several tasks are using the same file (which they are with the
libraries), then having the hash be the same between tasks would be
more efficient.

-- Steve