[PATCH 6.1 152/215] NFSD: Trace delegation revocations

Greg Kroah-Hartman
2024-03-04T21:50:36Z

From: Chuck Lever <chuck.lever@oracle.com>

[ Upstream commit a1c74569bbde91299f24535abf711be5c84df9de ]

Delegation revocation is an exceptional event that is not otherwise
visible externally (eg, no network traffic is emitted). Generate a
trace record when it occurs so that revocation can be observed or
other activity can be triggered. Example:

nfsd-1104 [005] 1912.002544: nfsd_stid_revoke: client 633c9343:4e82788d stateid 00000003:00000001 ref=2 type=DELEG

Trace infrastructure is provided for subsequent additional tracing
related to nfs4_stid activity.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/nfsd/nfs4state.c | 2 +
fs/nfsd/trace.h | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 57 insertions(+)

--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1367,6 +1367,8 @@ static void revoke_delegation(struct nfs

WARN_ON(!list_empty(&dp->dl_recall_lru));

+ trace_nfsd_stid_revoke(&dp->dl_stid);
+
if (clp->cl_minorversion) {
spin_lock(&clp->cl_lock);
dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID;
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -637,6 +637,61 @@ DEFINE_EVENT(nfsd_stateseqid_class, nfsd
DEFINE_STATESEQID_EVENT(preprocess);
DEFINE_STATESEQID_EVENT(open_confirm);

+TRACE_DEFINE_ENUM(NFS4_OPEN_STID);
+TRACE_DEFINE_ENUM(NFS4_LOCK_STID);
+TRACE_DEFINE_ENUM(NFS4_DELEG_STID);
+TRACE_DEFINE_ENUM(NFS4_CLOSED_STID);
+TRACE_DEFINE_ENUM(NFS4_REVOKED_DELEG_STID);
+TRACE_DEFINE_ENUM(NFS4_CLOSED_DELEG_STID);
+TRACE_DEFINE_ENUM(NFS4_LAYOUT_STID);
+
+#define show_stid_type(x) \
+ __print_flags(x, "|", \
+ { NFS4_OPEN_STID, "OPEN" }, \
+ { NFS4_LOCK_STID, "LOCK" }, \
+ { NFS4_DELEG_STID, "DELEG" }, \
+ { NFS4_CLOSED_STID, "CLOSED" }, \
+ { NFS4_REVOKED_DELEG_STID, "REVOKED" }, \
+ { NFS4_CLOSED_DELEG_STID, "CLOSED_DELEG" }, \
+ { NFS4_LAYOUT_STID, "LAYOUT" })
+
+DECLARE_EVENT_CLASS(nfsd_stid_class,
+ TP_PROTO(
+ const struct nfs4_stid *stid
+ ),
+ TP_ARGS(stid),
+ TP_STRUCT__entry(
+ __field(unsigned long, sc_type)
+ __field(int, sc_count)
+ __field(u32, cl_boot)
+ __field(u32, cl_id)
+ __field(u32, si_id)
+ __field(u32, si_generation)
+ ),
+ TP_fast_assign(
+ const stateid_t *stp = &stid->sc_stateid;
+
+ __entry->sc_type = stid->sc_type;
+ __entry->sc_count = refcount_read(&stid->sc_count);
+ __entry->cl_boot = stp->si_opaque.so_clid.cl_boot;
+ __entry->cl_id = stp->si_opaque.so_clid.cl_id;
+ __entry->si_id = stp->si_opaque.so_id;
+ __entry->si_generation = stp->si_generation;
+ ),
+ TP_printk("client %08x:%08x stateid %08x:%08x ref=%d type=%s",
+ __entry->cl_boot, __entry->cl_id,
+ __entry->si_id, __entry->si_generation,
+ __entry->sc_count, show_stid_type(__entry->sc_type)
+ )
+);
+
+#define DEFINE_STID_EVENT(name) \
+DEFINE_EVENT(nfsd_stid_class, nfsd_stid_##name, \
+ TP_PROTO(const struct nfs4_stid *stid), \
+ TP_ARGS(stid))
+
+DEFINE_STID_EVENT(revoke);
+
DECLARE_EVENT_CLASS(nfsd_clientid_class,
TP_PROTO(const clientid_t *clid),
TP_ARGS(clid),