nfsd: add support to CB_NOTIFY for dir attribute changes

If the client requested dir attribute change notifications, send those
alongside any set of add/remove/rename events. Note that the server wi

nfsd: add support to CB_NOTIFY for dir attribute changes

If the client requested dir attribute change notifications, send those
alongside any set of add/remove/rename events. Note that the server will
still recall the delegation on a SETATTR, so these are only sent for
changes to child dirents.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
[ cel: folded "nfsd: fix CB_NOTIFY workqueue loop when queue overflows" ]
[ cel: folded "nfsd: recall deleg if a requested dir attr change can't be encoded" ]
Link: https://patch.msgid.link/20260616-dir-deleg-v7-20-6cbc7eac0ade@kernel.org
Signed-off-by: Chuck Lever <cel@kernel.org>

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nfsd: add notification handlers for dir events

Add the necessary parts to accept a fsnotify callback for directory
change event and create a CB_NOTIFY request for it. When a dir nfsd_file
is created

nfsd: add notification handlers for dir events

Add the necessary parts to accept a fsnotify callback for directory
change event and create a CB_NOTIFY request for it. When a dir nfsd_file
is created set a handle_event callback to handle the notification.

Use that to allocate a nfsd_notify_event object and then hand off a
reference to each delegation's CB_NOTIFY. If anything fails along the
way, recall any affected delegations.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20260616-dir-deleg-v7-10-6cbc7eac0ade@kernel.org
Signed-off-by: Chuck Lever <cel@kernel.org>

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nfsd: add callback encoding and decoding linkages for CB_NOTIFY

Add routines for encoding and decoding CB_NOTIFY messages. These call
into the code generated by xdrgen to do the actual encoding and

nfsd: add callback encoding and decoding linkages for CB_NOTIFY

Add routines for encoding and decoding CB_NOTIFY messages. These call
into the code generated by xdrgen to do the actual encoding and
decoding.

For now, the encoder is a stub. Later patches will flesh out the payload
encoding.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20260616-dir-deleg-v7-7-6cbc7eac0ade@kernel.org
Signed-off-by: Chuck Lever <cel@kernel.org>

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nfs_common: add new NOTIFY4_* flags proposed in RFC8881bis

RFC8881bis adds some new flags to GET_DIR_DELEGATION that later patches
will consume. In particular, Linux nfsd can't easily provide info a

nfs_common: add new NOTIFY4_* flags proposed in RFC8881bis

RFC8881bis adds some new flags to GET_DIR_DELEGATION that later patches
will consume. In particular, Linux nfsd can't easily provide info about
directory cookies and ordering. The new flags allow it to omit that
information.

There is some risk here -- RFC8881bis is still a working group document,
and has been for years. The changes to directory delegations have been
stable for the last year or so however, so the hope is that those parts
won't change (much).

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20260616-dir-deleg-v7-3-6cbc7eac0ade@kernel.org
Signed-off-by: Chuck Lever <cel@kernel.org>

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nfsd: add protocol support for CB_NOTIFY

Add the necessary bits to nfs4_1.x and remove the duplicate definitions
from nfs4.h and the uapi nfs4 header. Regenerate the xdr files.

Note that regenerati

nfsd: add protocol support for CB_NOTIFY

Add the necessary bits to nfs4_1.x and remove the duplicate definitions
from nfs4.h and the uapi nfs4 header. Regenerate the xdr files.

Note that regenerating these files caused conflicts with the definitions
of NFS4_VERIFIER_SIZE and NFS4_FHSIZE in include/uapi/linux/nfs4.h.
These constants are defined by the RFC, and are not part of the kernel
API. They have been removed. Userspace consumers who require those
constants should plan to get them from more authoritative sources.

The nfsstat4 enum defined in the .x is fed to the xdrgen-generated wire
encoder and decoder, which treat every enumerated value as legal on the
wire. Do not carry the NFS4ERR_FIRST_FREE sentinel (which is not a
protocol error code) into the .x; keeping it would make 10097 a value
that could leak onto the wire. Instead base nfsd's internal error codes
(NFSERR_EOF and friends) at an impossible nfsstat4 value, as lockd does
for its nlm__int__* status codes.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20260616-dir-deleg-v7-2-6cbc7eac0ade@kernel.org
Signed-off-by: Chuck Lever <cel@kernel.org>

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