svn commit: r230252 - head/sys/fs/tmpfs

[Jaakko Heinonen]

On 2012-01-23, Mikolaj Golub wrote:
>  JH> Yes, the patch below does that. I suspect that flipping the MNT_RDONLY
>  JH> flag may be enough for tmpfs but I am not sure.
> 
> I see two issues with this patch:
> 
> 1) 'mount -u -o rw /mnt' does not upgrade to rw, although it returns success.

Argh, this is another nmount(2) bug. The update mount code automatically
sets the MNT_RDONLY flag but doesn't unset it. However the string option
always gets updated causing string options and flags to get out of sync.

Flags covered by MNT_UPDATEMASK are unset automatically.

> I think when remounting ro you should call vflush(), something like below:

Right.

Thanks for looking at the patch!

-- 
Jaakko