[PATCH v5 0/2] add rpc_status handler in nfsd debug filesystem

[PATCH v5 0/2] add rpc_status handler in nfsd debug filesystem

[Lorenzo Bianconi]

Introduce rpc_status entry in nfsd debug filesystem in order to dump
pending RPC requests debugging information.

Changes since v4:
- rely on acquire/release APIs and get rid of atomic operation
- fix kdoc for nfsd_rpc_status_open
- get rid of ',' as field delimiter in nfsd_rpc_status hanlder
- move nfsd_rpc_status before nfsd_v4 enum entries
- fix compilantion error if nfsdv4 is not enabled

Changes since v3:
- introduce rq_status_counter in order to detect if the RPC request is
  pending and RPC info are stable
- rely on __svc_print_addr to dump IP info

Changes since v2:
- minor changes in nfsd_rpc_status_show output

Changes since v1:
- rework nfsd_rpc_status_show output

Changes since RFCv1:
- riduce time holding nfsd_mutex bumping svc_serv refcoung in
  nfsd_rpc_status_open()
- dump rqstp->rq_stime
- add missing kdoc for nfsd_rpc_status_open()

Link: https://bugzilla.linux-nfs.org/show_bug.cgi?id=3D366

Lorenzo Bianconi (2):
  SUNRPC: add verbose parameter to __svc_print_addr()
  NFSD: add rpc_status entry in nfsd debug filesystem

 fs/nfsd/nfs4proc.c              |   4 +-
 fs/nfsd/nfsctl.c                |   9 ++
 fs/nfsd/nfsd.h                  |   7 ++
 fs/nfsd/nfssvc.c                | 140 ++++++++++++++++++++++++++++++++
 include/linux/sunrpc/svc.h      |   1 +
 include/linux/sunrpc/svc_xprt.h |  12 +--
 net/sunrpc/svc.c                |   2 +-
 net/sunrpc/svc_xprt.c           |   2 +-
 8 files changed, 166 insertions(+), 11 deletions(-)

-- 
2.41.0

[PATCH v5 1/2] SUNRPC: add verbose parameter to __svc_print_addr()

[Lorenzo Bianconi]

Introduce verbose parameter to utility routine in order to reduce output
verbosity. This is a preliminary patch to add rpc_status entry in nfsd
debug filesystem in order to dump pending RPC requests debugging
information.

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
 include/linux/sunrpc/svc_xprt.h | 12 ++++++------
 net/sunrpc/svc_xprt.c           |  2 +-
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/include/linux/sunrpc/svc_xprt.h b/include/linux/sunrpc/svc_xprt.h
index a6b12631db21..285bb25798c6 100644
--- a/include/linux/sunrpc/svc_xprt.h
+++ b/include/linux/sunrpc/svc_xprt.h
@@ -209,21 +209,21 @@ static inline unsigned short svc_xprt_remote_port(const struct svc_xprt *xprt)
 }
 
 static inline char *__svc_print_addr(const struct sockaddr *addr,
-				     char *buf, const size_t len)
+				     char *buf, const size_t len,
+				     bool verbose)
 {
 	const struct sockaddr_in *sin = (const struct sockaddr_in *)addr;
 	const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)addr;
 
 	switch (addr->sa_family) {
 	case AF_INET:
-		snprintf(buf, len, "%pI4, port=%u", &sin->sin_addr,
-			ntohs(sin->sin_port));
+		snprintf(buf, len, "%pI4%s%hu", &sin->sin_addr,
+			 verbose ? ", port=" : " ", ntohs(sin->sin_port));
 		break;
 
 	case AF_INET6:
-		snprintf(buf, len, "%pI6, port=%u",
-			 &sin6->sin6_addr,
-			ntohs(sin6->sin6_port));
+		snprintf(buf, len, "%pI6%s%hu", &sin6->sin6_addr,
+			 verbose ? ", port=" : " ", ntohs(sin6->sin6_port));
 		break;
 
 	default:
diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
index 62c7919ea610..16b794d291a4 100644
--- a/net/sunrpc/svc_xprt.c
+++ b/net/sunrpc/svc_xprt.c
@@ -386,7 +386,7 @@ EXPORT_SYMBOL_GPL(svc_xprt_copy_addrs);
  */
 char *svc_print_addr(struct svc_rqst *rqstp, char *buf, size_t len)
 {
-	return __svc_print_addr(svc_addr(rqstp), buf, len);
+	return __svc_print_addr(svc_addr(rqstp), buf, len, true);
 }
 EXPORT_SYMBOL_GPL(svc_print_addr);
 
-- 
2.41.0

[PATCH v5 2/2] NFSD: add rpc_status entry in nfsd debug filesystem

[Lorenzo Bianconi]

Introduce rpc_status entry in nfsd debug filesystem in order to dump
pending RPC requests debugging information.

Link: https://bugzilla.linux-nfs.org/show_bug.cgi?id=366
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
 fs/nfsd/nfs4proc.c         |   4 +-
 fs/nfsd/nfsctl.c           |   9 +++
 fs/nfsd/nfsd.h             |   7 ++
 fs/nfsd/nfssvc.c           | 140 +++++++++++++++++++++++++++++++++++++
 include/linux/sunrpc/svc.h |   1 +
 net/sunrpc/svc.c           |   2 +-
 6 files changed, 159 insertions(+), 4 deletions(-)

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index f0f318e78630..b7ad3081bc36 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -2497,8 +2497,6 @@ static inline void nfsd4_increment_op_stats(u32 opnum)
 
 static const struct nfsd4_operation nfsd4_ops[];
 
-static const char *nfsd4_op_name(unsigned opnum);
-
 /*
  * Enforce NFSv4.1 COMPOUND ordering rules:
  *
@@ -3628,7 +3626,7 @@ void warn_on_nonidempotent_op(struct nfsd4_op *op)
 	}
 }
 
-static const char *nfsd4_op_name(unsigned opnum)
+const char *nfsd4_op_name(unsigned opnum)
 {
 	if (opnum < ARRAY_SIZE(nfsd4_ops))
 		return nfsd4_ops[opnum].op_name;
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 35d2e2cde1eb..d47b98bad96e 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -47,6 +47,7 @@ enum {
 	NFSD_MaxBlkSize,
 	NFSD_MaxConnections,
 	NFSD_Filecache,
+	NFSD_Rpc_Status,
 	/*
 	 * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
 	 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
@@ -195,6 +196,13 @@ static inline struct net *netns(struct file *file)
 	return file_inode(file)->i_sb->s_fs_info;
 }
 
+static const struct file_operations nfsd_rpc_status_operations = {
+	.open		= nfsd_rpc_status_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= nfsd_pool_stats_release,
+};
+
 /*
  * write_unlock_ip - Release all locks used by a client
  *
@@ -1400,6 +1408,7 @@ static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
 		[NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
 		[NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
 #endif
+		[NFSD_Rpc_Status] = {"rpc_status", &nfsd_rpc_status_operations, S_IRUGO},
 		/* last one */ {""}
 	};
 
diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h
index d88498f8b275..50c82bb42e88 100644
--- a/fs/nfsd/nfsd.h
+++ b/fs/nfsd/nfsd.h
@@ -94,6 +94,7 @@ int		nfsd_get_nrthreads(int n, int *, struct net *);
 int		nfsd_set_nrthreads(int n, int *, struct net *);
 int		nfsd_pool_stats_open(struct inode *, struct file *);
 int		nfsd_pool_stats_release(struct inode *, struct file *);
+int		nfsd_rpc_status_open(struct inode *inode, struct file *file);
 void		nfsd_shutdown_threads(struct net *net);
 
 void		nfsd_put(struct net *net);
@@ -506,12 +507,18 @@ extern void nfsd4_ssc_init_umount_work(struct nfsd_net *nn);
 
 extern void nfsd4_init_leases_net(struct nfsd_net *nn);
 
+const char *nfsd4_op_name(unsigned opnum);
 #else /* CONFIG_NFSD_V4 */
 static inline int nfsd4_is_junction(struct dentry *dentry)
 {
 	return 0;
 }
 
+static inline const char *nfsd4_op_name(unsigned opnum)
+{
+	return "unknown_operation";
+}
+
 static inline void nfsd4_init_leases_net(struct nfsd_net *nn) { };
 
 #define register_cld_notifier() 0
diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index 97830e28c140..5e115dbbe9dc 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -1057,6 +1057,15 @@ int nfsd_dispatch(struct svc_rqst *rqstp)
 	if (!proc->pc_decode(rqstp, &rqstp->rq_arg_stream))
 		goto out_decode_err;
 
+	/*
+	 * Release rq_status_counter setting it to an odd value after the rpc
+	 * request has been properly parsed. rq_status_counter is used to
+	 * notify the consumers if the rqstp fields are stable
+	 * (rq_status_counter is odd) or not meaningful (rq_status_counter
+	 * is even).
+	 */
+	smp_store_release(&rqstp->rq_status_counter, rqstp->rq_status_counter | 1);
+
 	rp = NULL;
 	switch (nfsd_cache_lookup(rqstp, &rp)) {
 	case RC_DOIT:
@@ -1074,6 +1083,12 @@ int nfsd_dispatch(struct svc_rqst *rqstp)
 	if (!proc->pc_encode(rqstp, &rqstp->rq_res_stream))
 		goto out_encode_err;
 
+	/*
+	 * Release rq_status_counter setting it to an even value after the rpc
+	 * request has been properly processed.
+	 */
+	smp_store_release(&rqstp->rq_status_counter, rqstp->rq_status_counter + 1);
+
 	nfsd_cache_update(rqstp, rp, rqstp->rq_cachetype, statp + 1);
 out_cached_reply:
 	return 1;
@@ -1149,3 +1164,128 @@ int nfsd_pool_stats_release(struct inode *inode, struct file *file)
 	mutex_unlock(&nfsd_mutex);
 	return ret;
 }
+
+static int nfsd_rpc_status_show(struct seq_file *m, void *v)
+{
+	struct inode *inode = file_inode(m->file);
+	struct nfsd_net *nn = net_generic(inode->i_sb->s_fs_info, nfsd_net_id);
+	int i;
+
+	rcu_read_lock();
+
+	for (i = 0; i < nn->nfsd_serv->sv_nrpools; i++) {
+		struct svc_rqst *rqstp;
+
+		list_for_each_entry_rcu(rqstp,
+				&nn->nfsd_serv->sv_pools[i].sp_all_threads,
+				rq_all) {
+			struct {
+				struct sockaddr daddr;
+				struct sockaddr saddr;
+				unsigned long rq_flags;
+				const char *pc_name;
+				ktime_t rq_stime;
+				__be32 rq_xid;
+				u32 rq_prog;
+				u32 rq_vers;
+				/* NFSv4 compund */
+				u32 opnum[NFSD_MAX_OPS_PER_COMPOUND];
+				u8 opcnt;
+			} rqstp_info;
+			unsigned int status_counter;
+			char buf[RPC_MAX_ADDRBUFLEN];
+			int j;
+
+			/*
+			 * Acquire rq_status_counter before parsing the rqst
+			 * fields. rq_status_counter is set to an odd value in
+			 * order to notify the consumers the rqstp fields are
+			 * meaningful.
+			 */
+			status_counter = smp_load_acquire(&rqstp->rq_status_counter);
+			if (!(status_counter & 1))
+				continue;
+
+			rqstp_info.rq_xid = rqstp->rq_xid;
+			rqstp_info.rq_flags = rqstp->rq_flags;
+			rqstp_info.rq_prog = rqstp->rq_prog;
+			rqstp_info.rq_vers = rqstp->rq_vers;
+			rqstp_info.pc_name = svc_proc_name(rqstp);
+			rqstp_info.rq_stime = rqstp->rq_stime;
+			rqstp_info.opcnt = 0;
+			memcpy(&rqstp_info.daddr, svc_daddr(rqstp),
+			       sizeof(struct sockaddr));
+			memcpy(&rqstp_info.saddr, svc_addr(rqstp),
+			       sizeof(struct sockaddr));
+
+#ifdef CONFIG_NFSD_V4
+			if (rqstp->rq_vers == NFS4_VERSION &&
+			    rqstp->rq_proc == NFSPROC4_COMPOUND) {
+				/* NFSv4 compund */
+				struct nfsd4_compoundargs *args = rqstp->rq_argp;
+
+				rqstp_info.opcnt = args->opcnt;
+				for (j = 0; j < rqstp_info.opcnt; j++) {
+					struct nfsd4_op *op = &args->ops[j];
+
+					rqstp_info.opnum[j] = op->opnum;
+				}
+			}
+#endif /* CONFIG_NFSD_V4 */
+
+			/*
+			 * Acquire rq_status_counter before reporting the rqst
+			 * fields to the user.
+			 */
+			if (smp_load_acquire(&rqstp->rq_status_counter) != status_counter)
+				continue;
+
+			seq_printf(m,
+				   "0x%08x 0x%08lx 0x%08x NFSv%d %s %016lld",
+				   be32_to_cpu(rqstp_info.rq_xid),
+				   rqstp_info.rq_flags,
+				   rqstp_info.rq_prog,
+				   rqstp_info.rq_vers,
+				   rqstp_info.pc_name,
+				   ktime_to_us(rqstp_info.rq_stime));
+			seq_printf(m, " %s",
+				   __svc_print_addr(&rqstp_info.saddr, buf,
+						    sizeof(buf), false));
+			seq_printf(m, " %s",
+				   __svc_print_addr(&rqstp_info.daddr, buf,
+						    sizeof(buf), false));
+			for (j = 0; j < rqstp_info.opcnt; j++)
+				seq_printf(m, " %s",
+					   nfsd4_op_name(rqstp_info.opnum[j]));
+			seq_puts(m, "\n");
+		}
+	}
+
+	rcu_read_unlock();
+
+	return 0;
+}
+
+/**
+ * nfsd_rpc_status_open - open routine for nfsd_rpc_status handler
+ * @inode: entry inode pointer.
+ * @file: entry file pointer.
+ *
+ * nfsd_rpc_status_open is the open routine for nfsd_rpc_status procfs handler.
+ * nfsd_rpc_status dumps pending RPC requests info queued into nfs server.
+ */
+int nfsd_rpc_status_open(struct inode *inode, struct file *file)
+{
+	struct nfsd_net *nn = net_generic(inode->i_sb->s_fs_info, nfsd_net_id);
+
+	mutex_lock(&nfsd_mutex);
+	if (!nn->nfsd_serv) {
+		mutex_unlock(&nfsd_mutex);
+		return -ENODEV;
+	}
+
+	svc_get(nn->nfsd_serv);
+	mutex_unlock(&nfsd_mutex);
+
+	return single_open(file, nfsd_rpc_status_show, inode->i_private);
+}
diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
index fe1394cc1371..542a60b78bab 100644
--- a/include/linux/sunrpc/svc.h
+++ b/include/linux/sunrpc/svc.h
@@ -270,6 +270,7 @@ struct svc_rqst {
 						 * net namespace
 						 */
 	void **			rq_lease_breaker; /* The v4 client breaking a lease */
+	unsigned int		rq_status_counter; /* RPC processing counter */
 };
 
 #define SVC_NET(rqst) (rqst->rq_xprt ? rqst->rq_xprt->xpt_net : rqst->rq_bc_net)
diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
index 587811a002c9..44eac83b35a1 100644
--- a/net/sunrpc/svc.c
+++ b/net/sunrpc/svc.c
@@ -1629,7 +1629,7 @@ const char *svc_proc_name(const struct svc_rqst *rqstp)
 		return rqstp->rq_procinfo->pc_name;
 	return "unknown";
 }
-
+EXPORT_SYMBOL_GPL(svc_proc_name);
 
 /**
  * svc_encode_result_payload - mark a range of bytes as a result payload
-- 
2.41.0

Re: [PATCH v5 2/2] NFSD: add rpc_status entry in nfsd debug filesystem

[NeilBrown]

On Sat, 05 Aug 2023, Lorenzo Bianconi wrote:
> Introduce rpc_status entry in nfsd debug filesystem in order to dump
> pending RPC requests debugging information.
> 
> Link: https://bugzilla.linux-nfs.org/show_bug.cgi?id=366
> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
> ---
>  fs/nfsd/nfs4proc.c         |   4 +-
>  fs/nfsd/nfsctl.c           |   9 +++
>  fs/nfsd/nfsd.h             |   7 ++
>  fs/nfsd/nfssvc.c           | 140 +++++++++++++++++++++++++++++++++++++
>  include/linux/sunrpc/svc.h |   1 +
>  net/sunrpc/svc.c           |   2 +-
>  6 files changed, 159 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
> index f0f318e78630..b7ad3081bc36 100644
> --- a/fs/nfsd/nfs4proc.c
> +++ b/fs/nfsd/nfs4proc.c
> @@ -2497,8 +2497,6 @@ static inline void nfsd4_increment_op_stats(u32 opnum)
>  
>  static const struct nfsd4_operation nfsd4_ops[];
>  
> -static const char *nfsd4_op_name(unsigned opnum);
> -
>  /*
>   * Enforce NFSv4.1 COMPOUND ordering rules:
>   *
> @@ -3628,7 +3626,7 @@ void warn_on_nonidempotent_op(struct nfsd4_op *op)
>  	}
>  }
>  
> -static const char *nfsd4_op_name(unsigned opnum)
> +const char *nfsd4_op_name(unsigned opnum)
>  {
>  	if (opnum < ARRAY_SIZE(nfsd4_ops))
>  		return nfsd4_ops[opnum].op_name;
> diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
> index 35d2e2cde1eb..d47b98bad96e 100644
> --- a/fs/nfsd/nfsctl.c
> +++ b/fs/nfsd/nfsctl.c
> @@ -47,6 +47,7 @@ enum {
>  	NFSD_MaxBlkSize,
>  	NFSD_MaxConnections,
>  	NFSD_Filecache,
> +	NFSD_Rpc_Status,
>  	/*
>  	 * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
>  	 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
> @@ -195,6 +196,13 @@ static inline struct net *netns(struct file *file)
>  	return file_inode(file)->i_sb->s_fs_info;
>  }
>  
> +static const struct file_operations nfsd_rpc_status_operations = {
> +	.open		= nfsd_rpc_status_open,
> +	.read		= seq_read,
> +	.llseek		= seq_lseek,
> +	.release	= nfsd_pool_stats_release,
                          ^^^^^^^^^^^^^^^^^^^^^^^
This looks a bit strange, and nfsd_rpc_status_open is very similar to
nfsd_pool_stats_open.
I wonder we could unify some code a bit?
Maybe change nfsd_pool_stats_operations to nfsd_stats_operations,
with an "open" operation that inspects file_inode(file)->i_ino and 
does either nfsd_pool_stats_open or
    single_open(file, nfsd_rpc_status_show, inode->i_private);
??

Or at least rename nfsd_pool_stats_release to something more generic?

But that can be added later - it doesn't need to stop this patch
landing.

For this patch and the previous one;

 Reviewed-by: NeilBrown <neilb@suse.de>


> +};
> +
>  /*
>   * write_unlock_ip - Release all locks used by a client
>   *
> @@ -1400,6 +1408,7 @@ static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
>  		[NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
>  		[NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
>  #endif
> +		[NFSD_Rpc_Status] = {"rpc_status", &nfsd_rpc_status_operations, S_IRUGO},

If this could go earlier so that the array entries are in the same order
as the enum declaration, that would make me happy ....

NeilBrown


>  		/* last one */ {""}
>  	};
>  
> diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h
> index d88498f8b275..50c82bb42e88 100644
> --- a/fs/nfsd/nfsd.h
> +++ b/fs/nfsd/nfsd.h
> @@ -94,6 +94,7 @@ int		nfsd_get_nrthreads(int n, int *, struct net *);
>  int		nfsd_set_nrthreads(int n, int *, struct net *);
>  int		nfsd_pool_stats_open(struct inode *, struct file *);
>  int		nfsd_pool_stats_release(struct inode *, struct file *);
> +int		nfsd_rpc_status_open(struct inode *inode, struct file *file);
>  void		nfsd_shutdown_threads(struct net *net);
>  
>  void		nfsd_put(struct net *net);
> @@ -506,12 +507,18 @@ extern void nfsd4_ssc_init_umount_work(struct nfsd_net *nn);
>  
>  extern void nfsd4_init_leases_net(struct nfsd_net *nn);
>  
> +const char *nfsd4_op_name(unsigned opnum);
>  #else /* CONFIG_NFSD_V4 */
>  static inline int nfsd4_is_junction(struct dentry *dentry)
>  {
>  	return 0;
>  }
>  
> +static inline const char *nfsd4_op_name(unsigned opnum)
> +{
> +	return "unknown_operation";
> +}
> +
>  static inline void nfsd4_init_leases_net(struct nfsd_net *nn) { };
>  
>  #define register_cld_notifier() 0
> diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
> index 97830e28c140..5e115dbbe9dc 100644
> --- a/fs/nfsd/nfssvc.c
> +++ b/fs/nfsd/nfssvc.c
> @@ -1057,6 +1057,15 @@ int nfsd_dispatch(struct svc_rqst *rqstp)
>  	if (!proc->pc_decode(rqstp, &rqstp->rq_arg_stream))
>  		goto out_decode_err;
>  
> +	/*
> +	 * Release rq_status_counter setting it to an odd value after the rpc
> +	 * request has been properly parsed. rq_status_counter is used to
> +	 * notify the consumers if the rqstp fields are stable
> +	 * (rq_status_counter is odd) or not meaningful (rq_status_counter
> +	 * is even).
> +	 */
> +	smp_store_release(&rqstp->rq_status_counter, rqstp->rq_status_counter | 1);
> +
>  	rp = NULL;
>  	switch (nfsd_cache_lookup(rqstp, &rp)) {
>  	case RC_DOIT:
> @@ -1074,6 +1083,12 @@ int nfsd_dispatch(struct svc_rqst *rqstp)
>  	if (!proc->pc_encode(rqstp, &rqstp->rq_res_stream))
>  		goto out_encode_err;
>  
> +	/*
> +	 * Release rq_status_counter setting it to an even value after the rpc
> +	 * request has been properly processed.
> +	 */
> +	smp_store_release(&rqstp->rq_status_counter, rqstp->rq_status_counter + 1);
> +
>  	nfsd_cache_update(rqstp, rp, rqstp->rq_cachetype, statp + 1);
>  out_cached_reply:
>  	return 1;
> @@ -1149,3 +1164,128 @@ int nfsd_pool_stats_release(struct inode *inode, struct file *file)
>  	mutex_unlock(&nfsd_mutex);
>  	return ret;
>  }
> +
> +static int nfsd_rpc_status_show(struct seq_file *m, void *v)
> +{
> +	struct inode *inode = file_inode(m->file);
> +	struct nfsd_net *nn = net_generic(inode->i_sb->s_fs_info, nfsd_net_id);
> +	int i;
> +
> +	rcu_read_lock();
> +
> +	for (i = 0; i < nn->nfsd_serv->sv_nrpools; i++) {
> +		struct svc_rqst *rqstp;
> +
> +		list_for_each_entry_rcu(rqstp,
> +				&nn->nfsd_serv->sv_pools[i].sp_all_threads,
> +				rq_all) {
> +			struct {
> +				struct sockaddr daddr;
> +				struct sockaddr saddr;
> +				unsigned long rq_flags;
> +				const char *pc_name;
> +				ktime_t rq_stime;
> +				__be32 rq_xid;
> +				u32 rq_prog;
> +				u32 rq_vers;
> +				/* NFSv4 compund */
> +				u32 opnum[NFSD_MAX_OPS_PER_COMPOUND];
> +				u8 opcnt;
> +			} rqstp_info;
> +			unsigned int status_counter;
> +			char buf[RPC_MAX_ADDRBUFLEN];
> +			int j;
> +
> +			/*
> +			 * Acquire rq_status_counter before parsing the rqst
> +			 * fields. rq_status_counter is set to an odd value in
> +			 * order to notify the consumers the rqstp fields are
> +			 * meaningful.
> +			 */
> +			status_counter = smp_load_acquire(&rqstp->rq_status_counter);
> +			if (!(status_counter & 1))
> +				continue;
> +
> +			rqstp_info.rq_xid = rqstp->rq_xid;
> +			rqstp_info.rq_flags = rqstp->rq_flags;
> +			rqstp_info.rq_prog = rqstp->rq_prog;
> +			rqstp_info.rq_vers = rqstp->rq_vers;
> +			rqstp_info.pc_name = svc_proc_name(rqstp);
> +			rqstp_info.rq_stime = rqstp->rq_stime;
> +			rqstp_info.opcnt = 0;
> +			memcpy(&rqstp_info.daddr, svc_daddr(rqstp),
> +			       sizeof(struct sockaddr));
> +			memcpy(&rqstp_info.saddr, svc_addr(rqstp),
> +			       sizeof(struct sockaddr));
> +
> +#ifdef CONFIG_NFSD_V4
> +			if (rqstp->rq_vers == NFS4_VERSION &&
> +			    rqstp->rq_proc == NFSPROC4_COMPOUND) {
> +				/* NFSv4 compund */
> +				struct nfsd4_compoundargs *args = rqstp->rq_argp;
> +
> +				rqstp_info.opcnt = args->opcnt;
> +				for (j = 0; j < rqstp_info.opcnt; j++) {
> +					struct nfsd4_op *op = &args->ops[j];
> +
> +					rqstp_info.opnum[j] = op->opnum;
> +				}
> +			}
> +#endif /* CONFIG_NFSD_V4 */
> +
> +			/*
> +			 * Acquire rq_status_counter before reporting the rqst
> +			 * fields to the user.
> +			 */
> +			if (smp_load_acquire(&rqstp->rq_status_counter) != status_counter)
> +				continue;
> +
> +			seq_printf(m,
> +				   "0x%08x 0x%08lx 0x%08x NFSv%d %s %016lld",
> +				   be32_to_cpu(rqstp_info.rq_xid),
> +				   rqstp_info.rq_flags,
> +				   rqstp_info.rq_prog,
> +				   rqstp_info.rq_vers,
> +				   rqstp_info.pc_name,
> +				   ktime_to_us(rqstp_info.rq_stime));
> +			seq_printf(m, " %s",
> +				   __svc_print_addr(&rqstp_info.saddr, buf,
> +						    sizeof(buf), false));
> +			seq_printf(m, " %s",
> +				   __svc_print_addr(&rqstp_info.daddr, buf,
> +						    sizeof(buf), false));
> +			for (j = 0; j < rqstp_info.opcnt; j++)
> +				seq_printf(m, " %s",
> +					   nfsd4_op_name(rqstp_info.opnum[j]));
> +			seq_puts(m, "\n");
> +		}
> +	}
> +
> +	rcu_read_unlock();
> +
> +	return 0;
> +}
> +
> +/**
> + * nfsd_rpc_status_open - open routine for nfsd_rpc_status handler
> + * @inode: entry inode pointer.
> + * @file: entry file pointer.
> + *
> + * nfsd_rpc_status_open is the open routine for nfsd_rpc_status procfs handler.
> + * nfsd_rpc_status dumps pending RPC requests info queued into nfs server.
> + */
> +int nfsd_rpc_status_open(struct inode *inode, struct file *file)
> +{
> +	struct nfsd_net *nn = net_generic(inode->i_sb->s_fs_info, nfsd_net_id);
> +
> +	mutex_lock(&nfsd_mutex);
> +	if (!nn->nfsd_serv) {
> +		mutex_unlock(&nfsd_mutex);
> +		return -ENODEV;
> +	}
> +
> +	svc_get(nn->nfsd_serv);
> +	mutex_unlock(&nfsd_mutex);
> +
> +	return single_open(file, nfsd_rpc_status_show, inode->i_private);
> +}
> diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
> index fe1394cc1371..542a60b78bab 100644
> --- a/include/linux/sunrpc/svc.h
> +++ b/include/linux/sunrpc/svc.h
> @@ -270,6 +270,7 @@ struct svc_rqst {
>  						 * net namespace
>  						 */
>  	void **			rq_lease_breaker; /* The v4 client breaking a lease */
> +	unsigned int		rq_status_counter; /* RPC processing counter */
>  };
>  
>  #define SVC_NET(rqst) (rqst->rq_xprt ? rqst->rq_xprt->xpt_net : rqst->rq_bc_net)
> diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
> index 587811a002c9..44eac83b35a1 100644
> --- a/net/sunrpc/svc.c
> +++ b/net/sunrpc/svc.c
> @@ -1629,7 +1629,7 @@ const char *svc_proc_name(const struct svc_rqst *rqstp)
>  		return rqstp->rq_procinfo->pc_name;
>  	return "unknown";
>  }
> -
> +EXPORT_SYMBOL_GPL(svc_proc_name);
>  
>  /**
>   * svc_encode_result_payload - mark a range of bytes as a result payload
> -- 
> 2.41.0
> 
> 

Re: [PATCH v5 2/2] NFSD: add rpc_status entry in nfsd debug filesystem

[Chuck Lever]

On Sat, Aug 05, 2023 at 08:40:54AM +1000, NeilBrown wrote:
> On Sat, 05 Aug 2023, Lorenzo Bianconi wrote:
> > Introduce rpc_status entry in nfsd debug filesystem in order to dump
> > pending RPC requests debugging information.
> > 
> > Link: https://bugzilla.linux-nfs.org/show_bug.cgi?id=366
> > Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
> > ---
> >  fs/nfsd/nfs4proc.c         |   4 +-
> >  fs/nfsd/nfsctl.c           |   9 +++
> >  fs/nfsd/nfsd.h             |   7 ++
> >  fs/nfsd/nfssvc.c           | 140 +++++++++++++++++++++++++++++++++++++
> >  include/linux/sunrpc/svc.h |   1 +
> >  net/sunrpc/svc.c           |   2 +-
> >  6 files changed, 159 insertions(+), 4 deletions(-)
> > 
> > diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
> > index f0f318e78630..b7ad3081bc36 100644
> > --- a/fs/nfsd/nfs4proc.c
> > +++ b/fs/nfsd/nfs4proc.c
> > @@ -2497,8 +2497,6 @@ static inline void nfsd4_increment_op_stats(u32 opnum)
> >  
> >  static const struct nfsd4_operation nfsd4_ops[];
> >  
> > -static const char *nfsd4_op_name(unsigned opnum);
> > -
> >  /*
> >   * Enforce NFSv4.1 COMPOUND ordering rules:
> >   *
> > @@ -3628,7 +3626,7 @@ void warn_on_nonidempotent_op(struct nfsd4_op *op)
> >  	}
> >  }
> >  
> > -static const char *nfsd4_op_name(unsigned opnum)
> > +const char *nfsd4_op_name(unsigned opnum)
> >  {
> >  	if (opnum < ARRAY_SIZE(nfsd4_ops))
> >  		return nfsd4_ops[opnum].op_name;
> > diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
> > index 35d2e2cde1eb..d47b98bad96e 100644
> > --- a/fs/nfsd/nfsctl.c
> > +++ b/fs/nfsd/nfsctl.c
> > @@ -47,6 +47,7 @@ enum {
> >  	NFSD_MaxBlkSize,
> >  	NFSD_MaxConnections,
> >  	NFSD_Filecache,
> > +	NFSD_Rpc_Status,
> >  	/*
> >  	 * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
> >  	 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
> > @@ -195,6 +196,13 @@ static inline struct net *netns(struct file *file)
> >  	return file_inode(file)->i_sb->s_fs_info;
> >  }
> >  
> > +static const struct file_operations nfsd_rpc_status_operations = {
> > +	.open		= nfsd_rpc_status_open,
> > +	.read		= seq_read,
> > +	.llseek		= seq_lseek,
> > +	.release	= nfsd_pool_stats_release,
>                           ^^^^^^^^^^^^^^^^^^^^^^^
> This looks a bit strange, and nfsd_rpc_status_open is very similar to
> nfsd_pool_stats_open.
> I wonder we could unify some code a bit?
> Maybe change nfsd_pool_stats_operations to nfsd_stats_operations,
> with an "open" operation that inspects file_inode(file)->i_ino and 
> does either nfsd_pool_stats_open or
>     single_open(file, nfsd_rpc_status_show, inode->i_private);
> ??
> 
> Or at least rename nfsd_pool_stats_release to something more generic?
> 
> But that can be added later - it doesn't need to stop this patch
> landing.

Sure, I think this work is about ready to apply. I would like to
start closing in on the set of changes for v6.6 soon.

We can address clean-ups like this via additional patches.


> For this patch and the previous one;
> 
>  Reviewed-by: NeilBrown <neilb@suse.de>

Thank you for your review!


> > +};
> > +
> >  /*
> >   * write_unlock_ip - Release all locks used by a client
> >   *
> > @@ -1400,6 +1408,7 @@ static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
> >  		[NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
> >  		[NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
> >  #endif
> > +		[NFSD_Rpc_Status] = {"rpc_status", &nfsd_rpc_status_operations, S_IRUGO},
> 
> If this could go earlier so that the array entries are in the same order
> as the enum declaration, that would make me happy ....

I'll see if that works when I apply this.


> >  		/* last one */ {""}
> >  	};
> >  
> > diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h
> > index d88498f8b275..50c82bb42e88 100644
> > --- a/fs/nfsd/nfsd.h
> > +++ b/fs/nfsd/nfsd.h
> > @@ -94,6 +94,7 @@ int		nfsd_get_nrthreads(int n, int *, struct net *);
> >  int		nfsd_set_nrthreads(int n, int *, struct net *);
> >  int		nfsd_pool_stats_open(struct inode *, struct file *);
> >  int		nfsd_pool_stats_release(struct inode *, struct file *);
> > +int		nfsd_rpc_status_open(struct inode *inode, struct file *file);
> >  void		nfsd_shutdown_threads(struct net *net);
> >  
> >  void		nfsd_put(struct net *net);
> > @@ -506,12 +507,18 @@ extern void nfsd4_ssc_init_umount_work(struct nfsd_net *nn);
> >  
> >  extern void nfsd4_init_leases_net(struct nfsd_net *nn);
> >  
> > +const char *nfsd4_op_name(unsigned opnum);
> >  #else /* CONFIG_NFSD_V4 */
> >  static inline int nfsd4_is_junction(struct dentry *dentry)
> >  {
> >  	return 0;
> >  }
> >  
> > +static inline const char *nfsd4_op_name(unsigned opnum)
> > +{
> > +	return "unknown_operation";
> > +}
> > +
> >  static inline void nfsd4_init_leases_net(struct nfsd_net *nn) { };
> >  
> >  #define register_cld_notifier() 0
> > diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
> > index 97830e28c140..5e115dbbe9dc 100644
> > --- a/fs/nfsd/nfssvc.c
> > +++ b/fs/nfsd/nfssvc.c
> > @@ -1057,6 +1057,15 @@ int nfsd_dispatch(struct svc_rqst *rqstp)
> >  	if (!proc->pc_decode(rqstp, &rqstp->rq_arg_stream))
> >  		goto out_decode_err;
> >  
> > +	/*
> > +	 * Release rq_status_counter setting it to an odd value after the rpc
> > +	 * request has been properly parsed. rq_status_counter is used to
> > +	 * notify the consumers if the rqstp fields are stable
> > +	 * (rq_status_counter is odd) or not meaningful (rq_status_counter
> > +	 * is even).
> > +	 */
> > +	smp_store_release(&rqstp->rq_status_counter, rqstp->rq_status_counter | 1);
> > +
> >  	rp = NULL;
> >  	switch (nfsd_cache_lookup(rqstp, &rp)) {
> >  	case RC_DOIT:
> > @@ -1074,6 +1083,12 @@ int nfsd_dispatch(struct svc_rqst *rqstp)
> >  	if (!proc->pc_encode(rqstp, &rqstp->rq_res_stream))
> >  		goto out_encode_err;
> >  
> > +	/*
> > +	 * Release rq_status_counter setting it to an even value after the rpc
> > +	 * request has been properly processed.
> > +	 */
> > +	smp_store_release(&rqstp->rq_status_counter, rqstp->rq_status_counter + 1);
> > +
> >  	nfsd_cache_update(rqstp, rp, rqstp->rq_cachetype, statp + 1);
> >  out_cached_reply:
> >  	return 1;
> > @@ -1149,3 +1164,128 @@ int nfsd_pool_stats_release(struct inode *inode, struct file *file)
> >  	mutex_unlock(&nfsd_mutex);
> >  	return ret;
> >  }
> > +
> > +static int nfsd_rpc_status_show(struct seq_file *m, void *v)
> > +{
> > +	struct inode *inode = file_inode(m->file);
> > +	struct nfsd_net *nn = net_generic(inode->i_sb->s_fs_info, nfsd_net_id);
> > +	int i;
> > +
> > +	rcu_read_lock();
> > +
> > +	for (i = 0; i < nn->nfsd_serv->sv_nrpools; i++) {
> > +		struct svc_rqst *rqstp;
> > +
> > +		list_for_each_entry_rcu(rqstp,
> > +				&nn->nfsd_serv->sv_pools[i].sp_all_threads,
> > +				rq_all) {
> > +			struct {
> > +				struct sockaddr daddr;
> > +				struct sockaddr saddr;
> > +				unsigned long rq_flags;
> > +				const char *pc_name;
> > +				ktime_t rq_stime;
> > +				__be32 rq_xid;
> > +				u32 rq_prog;
> > +				u32 rq_vers;
> > +				/* NFSv4 compund */
> > +				u32 opnum[NFSD_MAX_OPS_PER_COMPOUND];
> > +				u8 opcnt;
> > +			} rqstp_info;
> > +			unsigned int status_counter;
> > +			char buf[RPC_MAX_ADDRBUFLEN];
> > +			int j;
> > +
> > +			/*
> > +			 * Acquire rq_status_counter before parsing the rqst
> > +			 * fields. rq_status_counter is set to an odd value in
> > +			 * order to notify the consumers the rqstp fields are
> > +			 * meaningful.
> > +			 */
> > +			status_counter = smp_load_acquire(&rqstp->rq_status_counter);
> > +			if (!(status_counter & 1))
> > +				continue;
> > +
> > +			rqstp_info.rq_xid = rqstp->rq_xid;
> > +			rqstp_info.rq_flags = rqstp->rq_flags;
> > +			rqstp_info.rq_prog = rqstp->rq_prog;
> > +			rqstp_info.rq_vers = rqstp->rq_vers;
> > +			rqstp_info.pc_name = svc_proc_name(rqstp);
> > +			rqstp_info.rq_stime = rqstp->rq_stime;
> > +			rqstp_info.opcnt = 0;
> > +			memcpy(&rqstp_info.daddr, svc_daddr(rqstp),
> > +			       sizeof(struct sockaddr));
> > +			memcpy(&rqstp_info.saddr, svc_addr(rqstp),
> > +			       sizeof(struct sockaddr));
> > +
> > +#ifdef CONFIG_NFSD_V4
> > +			if (rqstp->rq_vers == NFS4_VERSION &&
> > +			    rqstp->rq_proc == NFSPROC4_COMPOUND) {
> > +				/* NFSv4 compund */
> > +				struct nfsd4_compoundargs *args = rqstp->rq_argp;
> > +
> > +				rqstp_info.opcnt = args->opcnt;
> > +				for (j = 0; j < rqstp_info.opcnt; j++) {
> > +					struct nfsd4_op *op = &args->ops[j];
> > +
> > +					rqstp_info.opnum[j] = op->opnum;
> > +				}
> > +			}
> > +#endif /* CONFIG_NFSD_V4 */
> > +
> > +			/*
> > +			 * Acquire rq_status_counter before reporting the rqst
> > +			 * fields to the user.
> > +			 */
> > +			if (smp_load_acquire(&rqstp->rq_status_counter) != status_counter)
> > +				continue;
> > +
> > +			seq_printf(m,
> > +				   "0x%08x 0x%08lx 0x%08x NFSv%d %s %016lld",
> > +				   be32_to_cpu(rqstp_info.rq_xid),
> > +				   rqstp_info.rq_flags,
> > +				   rqstp_info.rq_prog,
> > +				   rqstp_info.rq_vers,
> > +				   rqstp_info.pc_name,
> > +				   ktime_to_us(rqstp_info.rq_stime));
> > +			seq_printf(m, " %s",
> > +				   __svc_print_addr(&rqstp_info.saddr, buf,
> > +						    sizeof(buf), false));
> > +			seq_printf(m, " %s",
> > +				   __svc_print_addr(&rqstp_info.daddr, buf,
> > +						    sizeof(buf), false));
> > +			for (j = 0; j < rqstp_info.opcnt; j++)
> > +				seq_printf(m, " %s",
> > +					   nfsd4_op_name(rqstp_info.opnum[j]));
> > +			seq_puts(m, "\n");
> > +		}
> > +	}
> > +
> > +	rcu_read_unlock();
> > +
> > +	return 0;
> > +}
> > +
> > +/**
> > + * nfsd_rpc_status_open - open routine for nfsd_rpc_status handler
> > + * @inode: entry inode pointer.
> > + * @file: entry file pointer.
> > + *
> > + * nfsd_rpc_status_open is the open routine for nfsd_rpc_status procfs handler.
> > + * nfsd_rpc_status dumps pending RPC requests info queued into nfs server.
> > + */
> > +int nfsd_rpc_status_open(struct inode *inode, struct file *file)
> > +{
> > +	struct nfsd_net *nn = net_generic(inode->i_sb->s_fs_info, nfsd_net_id);
> > +
> > +	mutex_lock(&nfsd_mutex);
> > +	if (!nn->nfsd_serv) {
> > +		mutex_unlock(&nfsd_mutex);
> > +		return -ENODEV;
> > +	}
> > +
> > +	svc_get(nn->nfsd_serv);
> > +	mutex_unlock(&nfsd_mutex);
> > +
> > +	return single_open(file, nfsd_rpc_status_show, inode->i_private);
> > +}
> > diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
> > index fe1394cc1371..542a60b78bab 100644
> > --- a/include/linux/sunrpc/svc.h
> > +++ b/include/linux/sunrpc/svc.h
> > @@ -270,6 +270,7 @@ struct svc_rqst {
> >  						 * net namespace
> >  						 */
> >  	void **			rq_lease_breaker; /* The v4 client breaking a lease */
> > +	unsigned int		rq_status_counter; /* RPC processing counter */
> >  };
> >  
> >  #define SVC_NET(rqst) (rqst->rq_xprt ? rqst->rq_xprt->xpt_net : rqst->rq_bc_net)
> > diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
> > index 587811a002c9..44eac83b35a1 100644
> > --- a/net/sunrpc/svc.c
> > +++ b/net/sunrpc/svc.c
> > @@ -1629,7 +1629,7 @@ const char *svc_proc_name(const struct svc_rqst *rqstp)
> >  		return rqstp->rq_procinfo->pc_name;
> >  	return "unknown";
> >  }
> > -
> > +EXPORT_SYMBOL_GPL(svc_proc_name);
> >  
> >  /**
> >   * svc_encode_result_payload - mark a range of bytes as a result payload
> > -- 
> > 2.41.0
> > 
> > 
> 

-- 
Chuck Lever

Re: [PATCH v5 2/2] NFSD: add rpc_status entry in nfsd debug filesystem

[Chuck Lever]

On Fri, Aug 04, 2023 at 07:16:08PM +0200, Lorenzo Bianconi wrote:
> Introduce rpc_status entry in nfsd debug filesystem in order to dump
> pending RPC requests debugging information.
> 
> Link: https://bugzilla.linux-nfs.org/show_bug.cgi?id=366
> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>

Hi Lorenzo, thanks for this new feature. It's been applied to the
nfsd-next branch (for v6.6). I've played with it a little using:

  # watch cat /proc/fs/nfsd/rpc_status

And it works a lot like a simple "top" command for RPCs. Nice!

Until this work is merged upstream in a few weeks, there is still an
easy opportunity to refine the information and format of the new
file, if anyone sees the need. The only thing I might think of
adding is a comment in line one like this:

 # version 1

to make extending the file format easier.

Thinking aloud, it occurs to me a similar status file for NFSv4
callback operations would be great to have.


> ---
>  fs/nfsd/nfs4proc.c         |   4 +-
>  fs/nfsd/nfsctl.c           |   9 +++
>  fs/nfsd/nfsd.h             |   7 ++
>  fs/nfsd/nfssvc.c           | 140 +++++++++++++++++++++++++++++++++++++
>  include/linux/sunrpc/svc.h |   1 +
>  net/sunrpc/svc.c           |   2 +-
>  6 files changed, 159 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
> index f0f318e78630..b7ad3081bc36 100644
> --- a/fs/nfsd/nfs4proc.c
> +++ b/fs/nfsd/nfs4proc.c
> @@ -2497,8 +2497,6 @@ static inline void nfsd4_increment_op_stats(u32 opnum)
>  
>  static const struct nfsd4_operation nfsd4_ops[];
>  
> -static const char *nfsd4_op_name(unsigned opnum);
> -
>  /*
>   * Enforce NFSv4.1 COMPOUND ordering rules:
>   *
> @@ -3628,7 +3626,7 @@ void warn_on_nonidempotent_op(struct nfsd4_op *op)
>  	}
>  }
>  
> -static const char *nfsd4_op_name(unsigned opnum)
> +const char *nfsd4_op_name(unsigned opnum)
>  {
>  	if (opnum < ARRAY_SIZE(nfsd4_ops))
>  		return nfsd4_ops[opnum].op_name;
> diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
> index 35d2e2cde1eb..d47b98bad96e 100644
> --- a/fs/nfsd/nfsctl.c
> +++ b/fs/nfsd/nfsctl.c
> @@ -47,6 +47,7 @@ enum {
>  	NFSD_MaxBlkSize,
>  	NFSD_MaxConnections,
>  	NFSD_Filecache,
> +	NFSD_Rpc_Status,
>  	/*
>  	 * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
>  	 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
> @@ -195,6 +196,13 @@ static inline struct net *netns(struct file *file)
>  	return file_inode(file)->i_sb->s_fs_info;
>  }
>  
> +static const struct file_operations nfsd_rpc_status_operations = {
> +	.open		= nfsd_rpc_status_open,
> +	.read		= seq_read,
> +	.llseek		= seq_lseek,
> +	.release	= nfsd_pool_stats_release,
> +};
> +
>  /*
>   * write_unlock_ip - Release all locks used by a client
>   *
> @@ -1400,6 +1408,7 @@ static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
>  		[NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
>  		[NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
>  #endif
> +		[NFSD_Rpc_Status] = {"rpc_status", &nfsd_rpc_status_operations, S_IRUGO},
>  		/* last one */ {""}
>  	};
>  
> diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h
> index d88498f8b275..50c82bb42e88 100644
> --- a/fs/nfsd/nfsd.h
> +++ b/fs/nfsd/nfsd.h
> @@ -94,6 +94,7 @@ int		nfsd_get_nrthreads(int n, int *, struct net *);
>  int		nfsd_set_nrthreads(int n, int *, struct net *);
>  int		nfsd_pool_stats_open(struct inode *, struct file *);
>  int		nfsd_pool_stats_release(struct inode *, struct file *);
> +int		nfsd_rpc_status_open(struct inode *inode, struct file *file);
>  void		nfsd_shutdown_threads(struct net *net);
>  
>  void		nfsd_put(struct net *net);
> @@ -506,12 +507,18 @@ extern void nfsd4_ssc_init_umount_work(struct nfsd_net *nn);
>  
>  extern void nfsd4_init_leases_net(struct nfsd_net *nn);
>  
> +const char *nfsd4_op_name(unsigned opnum);
>  #else /* CONFIG_NFSD_V4 */
>  static inline int nfsd4_is_junction(struct dentry *dentry)
>  {
>  	return 0;
>  }
>  
> +static inline const char *nfsd4_op_name(unsigned opnum)
> +{
> +	return "unknown_operation";
> +}
> +
>  static inline void nfsd4_init_leases_net(struct nfsd_net *nn) { };
>  
>  #define register_cld_notifier() 0
> diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
> index 97830e28c140..5e115dbbe9dc 100644
> --- a/fs/nfsd/nfssvc.c
> +++ b/fs/nfsd/nfssvc.c
> @@ -1057,6 +1057,15 @@ int nfsd_dispatch(struct svc_rqst *rqstp)
>  	if (!proc->pc_decode(rqstp, &rqstp->rq_arg_stream))
>  		goto out_decode_err;
>  
> +	/*
> +	 * Release rq_status_counter setting it to an odd value after the rpc
> +	 * request has been properly parsed. rq_status_counter is used to
> +	 * notify the consumers if the rqstp fields are stable
> +	 * (rq_status_counter is odd) or not meaningful (rq_status_counter
> +	 * is even).
> +	 */
> +	smp_store_release(&rqstp->rq_status_counter, rqstp->rq_status_counter | 1);
> +
>  	rp = NULL;
>  	switch (nfsd_cache_lookup(rqstp, &rp)) {
>  	case RC_DOIT:
> @@ -1074,6 +1083,12 @@ int nfsd_dispatch(struct svc_rqst *rqstp)
>  	if (!proc->pc_encode(rqstp, &rqstp->rq_res_stream))
>  		goto out_encode_err;
>  
> +	/*
> +	 * Release rq_status_counter setting it to an even value after the rpc
> +	 * request has been properly processed.
> +	 */
> +	smp_store_release(&rqstp->rq_status_counter, rqstp->rq_status_counter + 1);
> +
>  	nfsd_cache_update(rqstp, rp, rqstp->rq_cachetype, statp + 1);
>  out_cached_reply:
>  	return 1;
> @@ -1149,3 +1164,128 @@ int nfsd_pool_stats_release(struct inode *inode, struct file *file)
>  	mutex_unlock(&nfsd_mutex);
>  	return ret;
>  }
> +
> +static int nfsd_rpc_status_show(struct seq_file *m, void *v)
> +{
> +	struct inode *inode = file_inode(m->file);
> +	struct nfsd_net *nn = net_generic(inode->i_sb->s_fs_info, nfsd_net_id);
> +	int i;
> +
> +	rcu_read_lock();
> +
> +	for (i = 0; i < nn->nfsd_serv->sv_nrpools; i++) {
> +		struct svc_rqst *rqstp;
> +
> +		list_for_each_entry_rcu(rqstp,
> +				&nn->nfsd_serv->sv_pools[i].sp_all_threads,
> +				rq_all) {
> +			struct {
> +				struct sockaddr daddr;
> +				struct sockaddr saddr;
> +				unsigned long rq_flags;
> +				const char *pc_name;
> +				ktime_t rq_stime;
> +				__be32 rq_xid;
> +				u32 rq_prog;
> +				u32 rq_vers;
> +				/* NFSv4 compund */
> +				u32 opnum[NFSD_MAX_OPS_PER_COMPOUND];
> +				u8 opcnt;
> +			} rqstp_info;
> +			unsigned int status_counter;
> +			char buf[RPC_MAX_ADDRBUFLEN];
> +			int j;
> +
> +			/*
> +			 * Acquire rq_status_counter before parsing the rqst
> +			 * fields. rq_status_counter is set to an odd value in
> +			 * order to notify the consumers the rqstp fields are
> +			 * meaningful.
> +			 */
> +			status_counter = smp_load_acquire(&rqstp->rq_status_counter);
> +			if (!(status_counter & 1))
> +				continue;
> +
> +			rqstp_info.rq_xid = rqstp->rq_xid;
> +			rqstp_info.rq_flags = rqstp->rq_flags;
> +			rqstp_info.rq_prog = rqstp->rq_prog;
> +			rqstp_info.rq_vers = rqstp->rq_vers;
> +			rqstp_info.pc_name = svc_proc_name(rqstp);
> +			rqstp_info.rq_stime = rqstp->rq_stime;
> +			rqstp_info.opcnt = 0;
> +			memcpy(&rqstp_info.daddr, svc_daddr(rqstp),
> +			       sizeof(struct sockaddr));
> +			memcpy(&rqstp_info.saddr, svc_addr(rqstp),
> +			       sizeof(struct sockaddr));
> +
> +#ifdef CONFIG_NFSD_V4
> +			if (rqstp->rq_vers == NFS4_VERSION &&
> +			    rqstp->rq_proc == NFSPROC4_COMPOUND) {
> +				/* NFSv4 compund */
> +				struct nfsd4_compoundargs *args = rqstp->rq_argp;
> +
> +				rqstp_info.opcnt = args->opcnt;
> +				for (j = 0; j < rqstp_info.opcnt; j++) {
> +					struct nfsd4_op *op = &args->ops[j];
> +
> +					rqstp_info.opnum[j] = op->opnum;
> +				}
> +			}
> +#endif /* CONFIG_NFSD_V4 */
> +
> +			/*
> +			 * Acquire rq_status_counter before reporting the rqst
> +			 * fields to the user.
> +			 */
> +			if (smp_load_acquire(&rqstp->rq_status_counter) != status_counter)
> +				continue;
> +
> +			seq_printf(m,
> +				   "0x%08x 0x%08lx 0x%08x NFSv%d %s %016lld",
> +				   be32_to_cpu(rqstp_info.rq_xid),
> +				   rqstp_info.rq_flags,
> +				   rqstp_info.rq_prog,
> +				   rqstp_info.rq_vers,
> +				   rqstp_info.pc_name,
> +				   ktime_to_us(rqstp_info.rq_stime));
> +			seq_printf(m, " %s",
> +				   __svc_print_addr(&rqstp_info.saddr, buf,
> +						    sizeof(buf), false));
> +			seq_printf(m, " %s",
> +				   __svc_print_addr(&rqstp_info.daddr, buf,
> +						    sizeof(buf), false));
> +			for (j = 0; j < rqstp_info.opcnt; j++)
> +				seq_printf(m, " %s",
> +					   nfsd4_op_name(rqstp_info.opnum[j]));
> +			seq_puts(m, "\n");
> +		}
> +	}
> +
> +	rcu_read_unlock();
> +
> +	return 0;
> +}
> +
> +/**
> + * nfsd_rpc_status_open - open routine for nfsd_rpc_status handler
> + * @inode: entry inode pointer.
> + * @file: entry file pointer.
> + *
> + * nfsd_rpc_status_open is the open routine for nfsd_rpc_status procfs handler.
> + * nfsd_rpc_status dumps pending RPC requests info queued into nfs server.
> + */
> +int nfsd_rpc_status_open(struct inode *inode, struct file *file)
> +{
> +	struct nfsd_net *nn = net_generic(inode->i_sb->s_fs_info, nfsd_net_id);
> +
> +	mutex_lock(&nfsd_mutex);
> +	if (!nn->nfsd_serv) {
> +		mutex_unlock(&nfsd_mutex);
> +		return -ENODEV;
> +	}
> +
> +	svc_get(nn->nfsd_serv);
> +	mutex_unlock(&nfsd_mutex);
> +
> +	return single_open(file, nfsd_rpc_status_show, inode->i_private);
> +}
> diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
> index fe1394cc1371..542a60b78bab 100644
> --- a/include/linux/sunrpc/svc.h
> +++ b/include/linux/sunrpc/svc.h
> @@ -270,6 +270,7 @@ struct svc_rqst {
>  						 * net namespace
>  						 */
>  	void **			rq_lease_breaker; /* The v4 client breaking a lease */
> +	unsigned int		rq_status_counter; /* RPC processing counter */
>  };
>  
>  #define SVC_NET(rqst) (rqst->rq_xprt ? rqst->rq_xprt->xpt_net : rqst->rq_bc_net)
> diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
> index 587811a002c9..44eac83b35a1 100644
> --- a/net/sunrpc/svc.c
> +++ b/net/sunrpc/svc.c
> @@ -1629,7 +1629,7 @@ const char *svc_proc_name(const struct svc_rqst *rqstp)
>  		return rqstp->rq_procinfo->pc_name;
>  	return "unknown";
>  }
> -
> +EXPORT_SYMBOL_GPL(svc_proc_name);
>  
>  /**
>   * svc_encode_result_payload - mark a range of bytes as a result payload
> -- 
> 2.41.0
> 

-- 
Chuck Lever

Re: [PATCH v5 2/2] NFSD: add rpc_status entry in nfsd debug filesystem

[Jeff Layton]

On Mon, 2023-08-07 at 10:25 -0400, Chuck Lever wrote:
> On Fri, Aug 04, 2023 at 07:16:08PM +0200, Lorenzo Bianconi wrote:
> > Introduce rpc_status entry in nfsd debug filesystem in order to dump
> > pending RPC requests debugging information.
> > 
> > Link: https://bugzilla.linux-nfs.org/show_bug.cgi?id=366
> > Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
> 
> Hi Lorenzo, thanks for this new feature. It's been applied to the
> nfsd-next branch (for v6.6). I've played with it a little using:
> 
>   # watch cat /proc/fs/nfsd/rpc_status
> 
> And it works a lot like a simple "top" command for RPCs. Nice!
> 
> Until this work is merged upstream in a few weeks, there is still an
> easy opportunity to refine the information and format of the new
> file, if anyone sees the need. The only thing I might think of
> adding is a comment in line one like this:
> 
>  # version 1
>
> to make extending the file format easier.
> 


Good idea. I guess we could also add a header to the file after all too,
and just prefix it with '#'. Then any scripting we want to write will
always know that any line with a # is part of the header.

> Thinking aloud, it occurs to me a similar status file for NFSv4
> callback operations would be great to have.
> 

ACK, that would be nice. I don't think there is a handy list of
nfsd4_callback structures though. We'd probably need to add one.

> 
> > ---
> >  fs/nfsd/nfs4proc.c         |   4 +-
> >  fs/nfsd/nfsctl.c           |   9 +++
> >  fs/nfsd/nfsd.h             |   7 ++
> >  fs/nfsd/nfssvc.c           | 140 +++++++++++++++++++++++++++++++++++++
> >  include/linux/sunrpc/svc.h |   1 +
> >  net/sunrpc/svc.c           |   2 +-
> >  6 files changed, 159 insertions(+), 4 deletions(-)
> > 
> > diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
> > index f0f318e78630..b7ad3081bc36 100644
> > --- a/fs/nfsd/nfs4proc.c
> > +++ b/fs/nfsd/nfs4proc.c
> > @@ -2497,8 +2497,6 @@ static inline void nfsd4_increment_op_stats(u32 opnum)
> >  
> >  static const struct nfsd4_operation nfsd4_ops[];
> >  
> > -static const char *nfsd4_op_name(unsigned opnum);
> > -
> >  /*
> >   * Enforce NFSv4.1 COMPOUND ordering rules:
> >   *
> > @@ -3628,7 +3626,7 @@ void warn_on_nonidempotent_op(struct nfsd4_op *op)
> >  	}
> >  }
> >  
> > -static const char *nfsd4_op_name(unsigned opnum)
> > +const char *nfsd4_op_name(unsigned opnum)
> >  {
> >  	if (opnum < ARRAY_SIZE(nfsd4_ops))
> >  		return nfsd4_ops[opnum].op_name;
> > diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
> > index 35d2e2cde1eb..d47b98bad96e 100644
> > --- a/fs/nfsd/nfsctl.c
> > +++ b/fs/nfsd/nfsctl.c
> > @@ -47,6 +47,7 @@ enum {
> >  	NFSD_MaxBlkSize,
> >  	NFSD_MaxConnections,
> >  	NFSD_Filecache,
> > +	NFSD_Rpc_Status,
> >  	/*
> >  	 * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
> >  	 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
> > @@ -195,6 +196,13 @@ static inline struct net *netns(struct file *file)
> >  	return file_inode(file)->i_sb->s_fs_info;
> >  }
> >  
> > +static const struct file_operations nfsd_rpc_status_operations = {
> > +	.open		= nfsd_rpc_status_open,
> > +	.read		= seq_read,
> > +	.llseek		= seq_lseek,
> > +	.release	= nfsd_pool_stats_release,
> > +};
> > +
> >  /*
> >   * write_unlock_ip - Release all locks used by a client
> >   *
> > @@ -1400,6 +1408,7 @@ static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
> >  		[NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
> >  		[NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
> >  #endif
> > +		[NFSD_Rpc_Status] = {"rpc_status", &nfsd_rpc_status_operations, S_IRUGO},
> >  		/* last one */ {""}
> >  	};
> >  
> > diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h
> > index d88498f8b275..50c82bb42e88 100644
> > --- a/fs/nfsd/nfsd.h
> > +++ b/fs/nfsd/nfsd.h
> > @@ -94,6 +94,7 @@ int		nfsd_get_nrthreads(int n, int *, struct net *);
> >  int		nfsd_set_nrthreads(int n, int *, struct net *);
> >  int		nfsd_pool_stats_open(struct inode *, struct file *);
> >  int		nfsd_pool_stats_release(struct inode *, struct file *);
> > +int		nfsd_rpc_status_open(struct inode *inode, struct file *file);
> >  void		nfsd_shutdown_threads(struct net *net);
> >  
> >  void		nfsd_put(struct net *net);
> > @@ -506,12 +507,18 @@ extern void nfsd4_ssc_init_umount_work(struct nfsd_net *nn);
> >  
> >  extern void nfsd4_init_leases_net(struct nfsd_net *nn);
> >  
> > +const char *nfsd4_op_name(unsigned opnum);
> >  #else /* CONFIG_NFSD_V4 */
> >  static inline int nfsd4_is_junction(struct dentry *dentry)
> >  {
> >  	return 0;
> >  }
> >  
> > +static inline const char *nfsd4_op_name(unsigned opnum)
> > +{
> > +	return "unknown_operation";
> > +}
> > +
> >  static inline void nfsd4_init_leases_net(struct nfsd_net *nn) { };
> >  
> >  #define register_cld_notifier() 0
> > diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
> > index 97830e28c140..5e115dbbe9dc 100644
> > --- a/fs/nfsd/nfssvc.c
> > +++ b/fs/nfsd/nfssvc.c
> > @@ -1057,6 +1057,15 @@ int nfsd_dispatch(struct svc_rqst *rqstp)
> >  	if (!proc->pc_decode(rqstp, &rqstp->rq_arg_stream))
> >  		goto out_decode_err;
> >  
> > +	/*
> > +	 * Release rq_status_counter setting it to an odd value after the rpc
> > +	 * request has been properly parsed. rq_status_counter is used to
> > +	 * notify the consumers if the rqstp fields are stable
> > +	 * (rq_status_counter is odd) or not meaningful (rq_status_counter
> > +	 * is even).
> > +	 */
> > +	smp_store_release(&rqstp->rq_status_counter, rqstp->rq_status_counter | 1);
> > +
> >  	rp = NULL;
> >  	switch (nfsd_cache_lookup(rqstp, &rp)) {
> >  	case RC_DOIT:
> > @@ -1074,6 +1083,12 @@ int nfsd_dispatch(struct svc_rqst *rqstp)
> >  	if (!proc->pc_encode(rqstp, &rqstp->rq_res_stream))
> >  		goto out_encode_err;
> >  
> > +	/*
> > +	 * Release rq_status_counter setting it to an even value after the rpc
> > +	 * request has been properly processed.
> > +	 */
> > +	smp_store_release(&rqstp->rq_status_counter, rqstp->rq_status_counter + 1);
> > +
> >  	nfsd_cache_update(rqstp, rp, rqstp->rq_cachetype, statp + 1);
> >  out_cached_reply:
> >  	return 1;
> > @@ -1149,3 +1164,128 @@ int nfsd_pool_stats_release(struct inode *inode, struct file *file)
> >  	mutex_unlock(&nfsd_mutex);
> >  	return ret;
> >  }
> > +
> > +static int nfsd_rpc_status_show(struct seq_file *m, void *v)
> > +{
> > +	struct inode *inode = file_inode(m->file);
> > +	struct nfsd_net *nn = net_generic(inode->i_sb->s_fs_info, nfsd_net_id);
> > +	int i;
> > +
> > +	rcu_read_lock();
> > +
> > +	for (i = 0; i < nn->nfsd_serv->sv_nrpools; i++) {
> > +		struct svc_rqst *rqstp;
> > +
> > +		list_for_each_entry_rcu(rqstp,
> > +				&nn->nfsd_serv->sv_pools[i].sp_all_threads,
> > +				rq_all) {
> > +			struct {
> > +				struct sockaddr daddr;
> > +				struct sockaddr saddr;
> > +				unsigned long rq_flags;
> > +				const char *pc_name;
> > +				ktime_t rq_stime;
> > +				__be32 rq_xid;
> > +				u32 rq_prog;
> > +				u32 rq_vers;
> > +				/* NFSv4 compund */
> > +				u32 opnum[NFSD_MAX_OPS_PER_COMPOUND];
> > +				u8 opcnt;
> > +			} rqstp_info;
> > +			unsigned int status_counter;
> > +			char buf[RPC_MAX_ADDRBUFLEN];
> > +			int j;
> > +
> > +			/*
> > +			 * Acquire rq_status_counter before parsing the rqst
> > +			 * fields. rq_status_counter is set to an odd value in
> > +			 * order to notify the consumers the rqstp fields are
> > +			 * meaningful.
> > +			 */
> > +			status_counter = smp_load_acquire(&rqstp->rq_status_counter);
> > +			if (!(status_counter & 1))
> > +				continue;
> > +
> > +			rqstp_info.rq_xid = rqstp->rq_xid;
> > +			rqstp_info.rq_flags = rqstp->rq_flags;
> > +			rqstp_info.rq_prog = rqstp->rq_prog;
> > +			rqstp_info.rq_vers = rqstp->rq_vers;
> > +			rqstp_info.pc_name = svc_proc_name(rqstp);
> > +			rqstp_info.rq_stime = rqstp->rq_stime;
> > +			rqstp_info.opcnt = 0;
> > +			memcpy(&rqstp_info.daddr, svc_daddr(rqstp),
> > +			       sizeof(struct sockaddr));
> > +			memcpy(&rqstp_info.saddr, svc_addr(rqstp),
> > +			       sizeof(struct sockaddr));
> > +
> > +#ifdef CONFIG_NFSD_V4
> > +			if (rqstp->rq_vers == NFS4_VERSION &&
> > +			    rqstp->rq_proc == NFSPROC4_COMPOUND) {
> > +				/* NFSv4 compund */
> > +				struct nfsd4_compoundargs *args = rqstp->rq_argp;
> > +
> > +				rqstp_info.opcnt = args->opcnt;
> > +				for (j = 0; j < rqstp_info.opcnt; j++) {
> > +					struct nfsd4_op *op = &args->ops[j];
> > +
> > +					rqstp_info.opnum[j] = op->opnum;
> > +				}
> > +			}
> > +#endif /* CONFIG_NFSD_V4 */
> > +
> > +			/*
> > +			 * Acquire rq_status_counter before reporting the rqst
> > +			 * fields to the user.
> > +			 */
> > +			if (smp_load_acquire(&rqstp->rq_status_counter) != status_counter)
> > +				continue;
> > +
> > +			seq_printf(m,
> > +				   "0x%08x 0x%08lx 0x%08x NFSv%d %s %016lld",
> > +				   be32_to_cpu(rqstp_info.rq_xid),
> > +				   rqstp_info.rq_flags,
> > +				   rqstp_info.rq_prog,
> > +				   rqstp_info.rq_vers,
> > +				   rqstp_info.pc_name,
> > +				   ktime_to_us(rqstp_info.rq_stime));
> > +			seq_printf(m, " %s",
> > +				   __svc_print_addr(&rqstp_info.saddr, buf,
> > +						    sizeof(buf), false));
> > +			seq_printf(m, " %s",
> > +				   __svc_print_addr(&rqstp_info.daddr, buf,
> > +						    sizeof(buf), false));
> > +			for (j = 0; j < rqstp_info.opcnt; j++)
> > +				seq_printf(m, " %s",
> > +					   nfsd4_op_name(rqstp_info.opnum[j]));
> > +			seq_puts(m, "\n");
> > +		}
> > +	}
> > +
> > +	rcu_read_unlock();
> > +
> > +	return 0;
> > +}
> > +
> > +/**
> > + * nfsd_rpc_status_open - open routine for nfsd_rpc_status handler
> > + * @inode: entry inode pointer.
> > + * @file: entry file pointer.
> > + *
> > + * nfsd_rpc_status_open is the open routine for nfsd_rpc_status procfs handler.
> > + * nfsd_rpc_status dumps pending RPC requests info queued into nfs server.
> > + */
> > +int nfsd_rpc_status_open(struct inode *inode, struct file *file)
> > +{
> > +	struct nfsd_net *nn = net_generic(inode->i_sb->s_fs_info, nfsd_net_id);
> > +
> > +	mutex_lock(&nfsd_mutex);
> > +	if (!nn->nfsd_serv) {
> > +		mutex_unlock(&nfsd_mutex);
> > +		return -ENODEV;
> > +	}
> > +
> > +	svc_get(nn->nfsd_serv);
> > +	mutex_unlock(&nfsd_mutex);
> > +
> > +	return single_open(file, nfsd_rpc_status_show, inode->i_private);
> > +}
> > diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
> > index fe1394cc1371..542a60b78bab 100644
> > --- a/include/linux/sunrpc/svc.h
> > +++ b/include/linux/sunrpc/svc.h
> > @@ -270,6 +270,7 @@ struct svc_rqst {
> >  						 * net namespace
> >  						 */
> >  	void **			rq_lease_breaker; /* The v4 client breaking a lease */
> > +	unsigned int		rq_status_counter; /* RPC processing counter */
> >  };
> >  
> >  #define SVC_NET(rqst) (rqst->rq_xprt ? rqst->rq_xprt->xpt_net : rqst->rq_bc_net)
> > diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
> > index 587811a002c9..44eac83b35a1 100644
> > --- a/net/sunrpc/svc.c
> > +++ b/net/sunrpc/svc.c
> > @@ -1629,7 +1629,7 @@ const char *svc_proc_name(const struct svc_rqst *rqstp)
> >  		return rqstp->rq_procinfo->pc_name;
> >  	return "unknown";
> >  }
> > -
> > +EXPORT_SYMBOL_GPL(svc_proc_name);
> >  
> >  /**
> >   * svc_encode_result_payload - mark a range of bytes as a result payload
> > -- 
> > 2.41.0
> > 
> 

-- 
Jeff Layton <jlayton@kernel.org>

Re: [PATCH v5 0/2] add rpc_status handler in nfsd debug filesystem

[Jeff Layton]

On Fri, 2023-08-04 at 19:16 +0200, Lorenzo Bianconi wrote:
> Introduce rpc_status entry in nfsd debug filesystem in order to dump
> pending RPC requests debugging information.
> 
> Changes since v4:
> - rely on acquire/release APIs and get rid of atomic operation
> - fix kdoc for nfsd_rpc_status_open
> - get rid of ',' as field delimiter in nfsd_rpc_status hanlder
> - move nfsd_rpc_status before nfsd_v4 enum entries
> - fix compilantion error if nfsdv4 is not enabled
> 
> Changes since v3:
> - introduce rq_status_counter in order to detect if the RPC request is
>   pending and RPC info are stable
> - rely on __svc_print_addr to dump IP info
> 
> Changes since v2:
> - minor changes in nfsd_rpc_status_show output
> 
> Changes since v1:
> - rework nfsd_rpc_status_show output
> 
> Changes since RFCv1:
> - riduce time holding nfsd_mutex bumping svc_serv refcoung in
>   nfsd_rpc_status_open()
> - dump rqstp->rq_stime
> - add missing kdoc for nfsd_rpc_status_open()
> 
> Link: https://bugzilla.linux-nfs.org/show_bug.cgi?id=3D366
> 
> Lorenzo Bianconi (2):
>   SUNRPC: add verbose parameter to __svc_print_addr()
>   NFSD: add rpc_status entry in nfsd debug filesystem
> 
>  fs/nfsd/nfs4proc.c              |   4 +-
>  fs/nfsd/nfsctl.c                |   9 ++
>  fs/nfsd/nfsd.h                  |   7 ++
>  fs/nfsd/nfssvc.c                | 140 ++++++++++++++++++++++++++++++++
>  include/linux/sunrpc/svc.h      |   1 +
>  include/linux/sunrpc/svc_xprt.h |  12 +--
>  net/sunrpc/svc.c                |   2 +-
>  net/sunrpc/svc_xprt.c           |   2 +-
>  8 files changed, 166 insertions(+), 11 deletions(-)
> 

Reviewed-by: Jeff Layton <jlayton@kernel.org>