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e13d505af7
nfsd_genl_rpc_status_compose_msg() returns -ENOBUFS on nla_put failure
without calling genlmsg_cancel(), leaving a partial message in the skb.
The caller then propagates -ENOBUFS directly, which the netlink dump
infrastructure treats as a fatal error, aborting the entire dump.
The correct netlink dump convention is:
- Cancel any partial message with genlmsg_cancel()
- If prior messages were added to the skb (skb->len > 0), save the
current iterator position and return skb->len to paginate
- Only return a negative errno when no messages fit at all
Fix compose_msg to cancel the partial message on all nla_put failure
paths, and fix the caller to paginate when possible rather than
returning a fatal error.
A second defect surfaces once pagination actually works: cb->args[1]
records the resume index within the pool named by cb->args[0], but the
inner loop applied it to every pool from cb->args[0] onward. After a
mid-pool pause, a later dump call drains the resume pool and continues
into subsequent pools within the same call, where the stale cb->args[1]
caused the first N threads of each following pool to be skipped. On
per-CPU or per-node pool configurations this silently dropped active
requests from the dump. Apply the saved thread index only to the pool
matching cb->args[0], and start every subsequent pool from thread 0.
Fixes: bd9d6a3efa ("NFSD: add rpc_status netlink support")
Cc: stable@vger.kernel.org
Assisted-by: Claude:claude-opus-4-8
Signed-off-by: Jeff Layton <jlayton@kernel.org>
[ cel: fold in 20/21 to avoid bisect hazard ]
Link: https://patch.msgid.link/20260611-nfsd-testing-v2-3-5b90e276f2d9@kernel.org
Signed-off-by: Chuck Lever <cel@kernel.org>
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