Re: [RFC,PATCH] dnotify: enhance or replace?

[Paul Rolland]

Hello,

> could be done. Inode numbers are not unique, but is there any 
> way to get
> a unique identifier on a file without using an open file? I have come
I wonder if adding to the inode number something like the device
id is not enough to create some "unique key"...

> up with a few ideas.. I don't think they are very good, but here is
> goes,
> 
> - When user passes fd to kernel to watch, the kernel takes over this
>   fd, making it invalid in user space ( I know this is a 
> terrible hack)
>   then when a volume is unmounted, the kernel can walk the list of 
>   open fd's using for notifacation and close them, before 
> attempting to
>   unmount.
No, this is bad, because it would require to use dedicated fd for
dnotify. If I open a file/directory, give it to dnotify, I don't
want to re-open it to use it, read it, or anything else...
 
> - The user passes a path to the kernel, the kernel does some work so
>   that it can track anything to do with that path, and again when
>   an unmount is called the kernel cleans up anything used for
>   notification. 
That sounds much better to me...

Regards,
Paul

Paul Rolland, rol(at)as2917.net
ex-AS2917 Network administrator and Peering Coordinator

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