Re: [PATCH] Btrfs: add "nocompress" mount option

[Andrei Popa <ierdnah@gmail.com>]

On Fri, 2012-06-15 at 12:50 +0200, David Sterba wrote:
>   mount -o compress,nocompress /dev /mnt
> 
> Is it on or off? Yeah we can document that nocompress has higher
> priority. But then I can't turn a nocompress option back to compress via
> remount. This is possible with Arnd's patch.

This happens for space_cache mount option:
ierdnac-hp ~ # mount -o remount,space_cache,nospace_cache /mnt/btrfs/

Also there are mount option that can't be enabled/disabled by remount
like:
nobarrier - > "barrier" mount option doesn't exists
ssd -> "nossd" doesn't exists
noacl, user_subvol_rm_allowed, autodefrag, inode_cache, check_int,
check_int_data.

For some of these(ex: nossd,barrier) I think it would be usefull to have
the reverse action.
What do you think ?

Andrei