New inode parent information needed for ACL

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Hi,

I've been hacking a bit on xattr-based ACLs for Ceph. It's all working
fine, but I'm having some trouble wiring up the default ACL init code
for new inodes (mknod, create, mkdir, and symlink): New ACLs depend on
the the ACL of the parent. The ideal location seems to be in fill_inode,
but it is unclear how to access the parent inode of the original request
from fill_inode because it is receiving the filler information just from a
mds reply. Is getting the parent information in fill_inode possible?

Alternatively, in each of ceph_mknod, ceph_symlink, etc..., the problem would
be solved trivially if the new inode is available because the parent information
is provided. For example, in ceph_mknod, on success will dentry->d_inode alway point
to the new inode, or is there more async stuff going on?

Thanks,
Noah
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