Re: [v6 2/4] ext4: adds project ID support

On Sun, Nov 09, 2014 at 01:43:37AM +0800, Li Xi wrote:

This patch adds a new internal field of ext4 inode to save project
identifier. Also a new flag EXT4_INODE_PROJINHERIT is added for
inheriting project ID from parent directory.

What would be the downside of simply always inhereiting the project ID
from the parent directory?  I see that if the flag is not set, the
project id will be 0 instead.  I'm not sure when that would actually
be desirable.

To the extent that the project ID is designed to implement a quota
over a directory extent, the fact that the owner can clear the
EXT4_PROJINHERET_FL and then arrange to have the quota charged to
project 0 seems to me to be a bug, not a feature.

Can you explain what your intended use case for this flag might be?

Thanks,

						- Ted