[PATCH 5.13 256/351] NFSD: Add nfsd_clid_confirmed tracepoint

Greg Kroah-Hartman
2021-07-19T17:48:36Z

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

[ Upstream commit 7e3b32ace6094aadfa2e1e54ca4c6bbfd07646af ]

This replaces a dprintk call site in order to get greater visibility
on when client IDs are confirmed or re-used. Simple example:

nfsd-995 [000] 126.622975: nfsd_compound: xid=0x3a34e2b1 opcnt=1
nfsd-995 [000] 126.623005: nfsd_cb_args: addr=192.168.2.51:45901 client 60958e3b:9213ef0e prog=1073741824 ident=1
nfsd-995 [000] 126.623007: nfsd_compound_status: op=1/1 OP_SETCLIENTID status=0
nfsd-996 [001] 126.623142: nfsd_compound: xid=0x3b34e2b1 opcnt=1
>>>> nfsd-996 [001] 126.623146: nfsd_clid_confirmed: client 60958e3b:9213ef0e
nfsd-996 [001] 126.623148: nfsd_cb_probe: addr=192.168.2.51:45901 client 60958e3b:9213ef0e state=UNKNOWN
nfsd-996 [001] 126.623154: nfsd_compound_status: op=1/1 OP_SETCLIENTID_CONFIRM status=0

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/nfsd/nfs4state.c | 10 +++++-----
fs/nfsd/trace.h | 1 +
2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 6abe48dee6ed..67ebb040bc5f 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -2816,14 +2816,14 @@ move_to_confirmed(struct nfs4_client *clp)

lockdep_assert_held(&nn->client_lock);

- dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
add_clp_to_name_tree(clp, &nn->conf_name_tree);
- if (!test_and_set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags) &&
- clp->cl_nfsd_dentry &&
- clp->cl_nfsd_info_dentry)
- fsnotify_dentry(clp->cl_nfsd_info_dentry, FS_MODIFY);
+ if (!test_and_set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags)) {
+ trace_nfsd_clid_confirmed(&clp->cl_clientid);
+ if (clp->cl_nfsd_dentry && clp->cl_nfsd_info_dentry)
+ fsnotify_dentry(clp->cl_nfsd_info_dentry, FS_MODIFY);
+ }
renew_client_locked(clp);
}

diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
index 42ad2a02f953..e7a269291a73 100644
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -511,6 +511,7 @@ DEFINE_EVENT(nfsd_clientid_class, nfsd_clid_##name, \
TP_PROTO(const clientid_t *clid), \
TP_ARGS(clid))

+DEFINE_CLIENTID_EVENT(confirmed);
DEFINE_CLIENTID_EVENT(expired);
DEFINE_CLIENTID_EVENT(purged);
DEFINE_CLIENTID_EVENT(renew);
--
2.30.2