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From:   Dai Ngo <dai.ngo@oracle.com>
To:     chuck.lever@oracle.com, jlayton@kernel.org
Cc:     linux-nfs@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: [PATCH v2 2/2] NFSD: add counter for write delegation recall due to conflict with GETATTR
Date:   Mon, 29 May 2023 23:52:17 -0700
Message-Id: <1685429537-11855-3-git-send-email-dai.ngo@oracle.com>
In-Reply-To: <1685429537-11855-1-git-send-email-dai.ngo@oracle.com>
References: <1685429537-11855-1-git-send-email-dai.ngo@oracle.com>
Precedence: bulk

Add counter to keep track of how many times write delegations are
recalled due to conflict with GETATTR.

Signed-off-by: Dai Ngo <dai.ngo@oracle.com>
---
 fs/nfsd/nfs4state.c | 1 +
 fs/nfsd/stats.c     | 2 ++
 fs/nfsd/stats.h     | 7 +++++++
 3 files changed, 10 insertions(+)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 7826483e8421..829c68841d7d 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -8392,6 +8392,7 @@ nfsd4_deleg_getattr_conflict(struct svc_rqst *rqstp, struct inode *inode)
 				return 0;
 			}
 			spin_unlock(&ctx->flc_lock);
+			nfsd_stats_wdeleg_getattr_inc();
 			status = nfserrno(nfsd_open_break_lease(inode, NFSD_MAY_READ));
 			if (status != nfserr_jukebox ||
 					!nfsd_wait_for_delegreturn(rqstp, inode))
diff --git a/fs/nfsd/stats.c b/fs/nfsd/stats.c
index 777e24e5da33..63797635e1c3 100644
--- a/fs/nfsd/stats.c
+++ b/fs/nfsd/stats.c
@@ -65,6 +65,8 @@ static int nfsd_show(struct seq_file *seq, void *v)
 		seq_printf(seq, " %lld",
 			   percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_NFS4_OP(i)]));
 	}
+	seq_printf(seq, "\nwdeleg_getattr %lld",
+		percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_WDELEG_GETATTR]));
 
 	seq_putc(seq, '\n');
 #endif
diff --git a/fs/nfsd/stats.h b/fs/nfsd/stats.h
index 9b43dc3d9991..cf5524e7ca06 100644
--- a/fs/nfsd/stats.h
+++ b/fs/nfsd/stats.h
@@ -22,6 +22,7 @@ enum {
 	NFSD_STATS_FIRST_NFS4_OP,	/* count of individual nfsv4 operations */
 	NFSD_STATS_LAST_NFS4_OP = NFSD_STATS_FIRST_NFS4_OP + LAST_NFS4_OP,
 #define NFSD_STATS_NFS4_OP(op)	(NFSD_STATS_FIRST_NFS4_OP + (op))
+	NFSD_STATS_WDELEG_GETATTR,	/* count of getattr conflict with wdeleg */
 #endif
 	NFSD_STATS_COUNTERS_NUM
 };
@@ -93,4 +94,10 @@ static inline void nfsd_stats_drc_mem_usage_sub(struct nfsd_net *nn, s64 amount)
 	percpu_counter_sub(&nn->counter[NFSD_NET_DRC_MEM_USAGE], amount);
 }
 
+#ifdef CONFIG_NFSD_V4
+static inline void nfsd_stats_wdeleg_getattr_inc(void)
+{
+	percpu_counter_inc(&nfsdstats.counter[NFSD_STATS_WDELEG_GETATTR]);
+}
+#endif
 #endif /* _NFSD_STATS_H */
-- 
2.9.5