Russell King wrote:
>
> Petr Vandrovec writes:
> > ... or from sys_exit() if you forget to unmap. Or from anywhere if
> > swapping code decides to swap such page. I'm trying to hunt it down
> > for more than month, but I have no idea what's wrong. In my case
> > way to trigger bug is:
>
> I actually think its as simple as:
>
0. open file
> 1. shared map file
> 2. close file
> 3. unlink file
> 4. unmap shared mapping
Will it work correctly if 4. is done before 3. (even before 2?)
Is it legal/good practice to unmap the file after closing it?
(Since the sharing needs the fd to mmap it)
I would have expected this order:
A. open file
B. shared map file
C. unmap shared mapping
D. close file
E. unlink file
But in your case the unlink should be deferred to unmap time...
(if it is legal)
Successful unlinking a file should probably free pages directly to
free list - might be worth optimizing for.
/RogerL
Disclaimer:
I do not really understand fs code...
>
> In my case, I was running newaliases, and there wasn't any other
> processes using that mapping.
> _____
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