On Wed, Nov 24, 2021 at 04:19:55PM +0800, Muchun Song wrote:

PDE_DATA(inode) is introduced to get user private data and hide the
layout of struct proc_dir_entry. The inode->i_private is used to do
the same thing as well. Save a copy of user private data to inode->
i_private when proc inode is allocated. This means the user also can
get their private data by inode->i_private.

Introduce pde_data() to wrap inode->i_private so that we can remove
PDE_DATA() from fs/proc/generic.c and make PTE_DATE() as a wrapper
of pde_data(). It will be easier if we decide to remove PDE_DATE()
in the future.

Signed-off-by: Muchun Song <redacted>
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Seems like a good idea to me.
Acked-by: Christian Brauner <redacted>