understanding inode_permission and inode_mkdir

From: Javier Valencia (jvalencia@private)
Date: Wed Dec 01 2004 - 06:34:35 PST 

How interact these actions?

If I don't let a dir-inode write access in inode_permission, how can 
mkdir work?
Lately, I saw that it can be stopped in inode_mkdir, but i don't 
understand why some read/write permissions are used on inode_permission 
and others don't.

Also, how can i travel by a dentry tree from an struct inode?

Thanks.

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