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Date: Sat, 26 May 2018 01:03:02 +0100
From: Al Viro <viro@ZenIV.linux.org.uk>
To: linux-fsdevel@vger.kernel.org
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Subject: [RFC][PATCHES] reducing d_add() use, part 3 (procfs)
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 <20180525235326.GJ30522@ZenIV.linux.org.uk>
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On Sat, May 26, 2018 at 12:53:26AM +0100, Al Viro wrote:
> Continuation of the series - more simple cases:
>       openpromfs: switch to d_splice_alias()
>       orangefs_lookup: simplify
>       omfs_lookup(): report IO errors, use d_splice_alias()
>       hfs: use d_splice_alias()
>       hfs: don't allow mounting over .../rsrc
>       hfsplus: switch to d_splice_alias()
>       ncp_lookup(): use d_splice_alias()
>       9p: unify paths in v9fs_vfs_lookup()
>       cifs_lookup(): cifs_get_inode_...() never returns 0 with *inode left NULL
>       cifs_lookup(): switch to d_splice_alias()

... and a lot more convoluted ones - procfs side.  There we have a bloody
misleading games around pid_revalidate() and friends; we do *NOT* need those
for any kind of race protection anymore (and hadn't for years).  However,
these calls cannot be simply dropped - some of their side effects (namely,
setting ownership and permissions) are needed.  Separating those into
common helpers used by revalidate and by lookups allows to untangle that
mess.

I would really like an ACK/NAK from Alexey on that part...