On 8/1/13 7:34 AM, Felipe Monteiro de Carvalho wrote:

Hello,

Ok, I found that the permissions that I was looking for are stored in
ext4_inode.i_mode ... but still there is the question: What is ACL
used for then, and when is it different than zero?

thanks =)

It is the block number containing an extended attribute for that inode,
if any; that extended attribute may be a file ACL.

It's a bit odd to call the xattr block "ACL" but it is what it is.  ;)

-Eric