Re: [PATCH] eventfs: Have inodes have unique inode numbers

[Steven Rostedt]

On Fri, 26 Jan 2024 13:36:20 -0800
Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:

> On Fri, 26 Jan 2024 at 13:26, Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
> >
> > I'd be happy to change that patch to what I originally did before deciding
> > to copy get_next_ino():
> >
> > unsigned int tracefs_get_next_ino(int files)
> > {
> >         static atomic_t next_inode;
> >         unsigned int res;
> >
> >         do {
> >                 res = atomic_add_return(files + 1, &next_inode);
> >
> >                 /* Check for overflow */
> >         } while (unlikely(res < files + 1));
> >
> >         return res - files;  
> 
> Still entirely pointless.
> 
> If you have more than 4 billion inodes, something is really really wrong.

No, but you can trivially make a loop that creates and destroys
directories that will eventually overflow the count.

-- Steve