NFS: Replace fs_context-related dprintk() call sites with tracepoints

Contributed as part of the long patch series that converts NFS from
using dprintk to tracepoints for observability.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

fs/nfs/fs_context.c

@@ -21,6 +21,8 @@
 #include "nfs.h"
 #include "internal.h"
 
+#include "nfstrace.h"
+
 #define NFSDBG_FACILITY		NFSDBG_MOUNT
 
 #if IS_ENABLED(CONFIG_NFS_V3)
@@ -284,7 +286,6 @@ static int nfs_verify_server_address(struct sockaddr *addr)
 	}
 	}
 
-	dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
 	return 0;
 }
 
@@ -378,7 +379,7 @@ static int nfs_parse_security_flavors(struct fs_context *fc,
 	char *string = param->string, *p;
 	int ret;
 
-	dfprintk(MOUNT, "NFS: parsing %s=%s option\n", param->key, param->string);
+	trace_nfs_mount_assign(param->key, string);
 
 	while ((p = strsep(&string, ":")) != NULL) {
 		if (!*p)
@@ -480,7 +481,7 @@ static int nfs_fs_context_parse_param(struct fs_context *fc,
 	unsigned int len;
 	int ret, opt;
 
-	dfprintk(MOUNT, "NFS:   parsing nfs mount option '%s'\n", param->key);
+	trace_nfs_mount_option(param);
 
 	opt = fs_parse(fc, nfs_fs_parameters, param, &result);
 	if (opt < 0)
@@ -683,6 +684,7 @@ static int nfs_fs_context_parse_param(struct fs_context *fc,
 			return ret;
 		break;
 	case Opt_vers:
+		trace_nfs_mount_assign(param->key, param->string);
 		ret = nfs_parse_version_string(fc, param->string);
 		if (ret < 0)
 			return ret;
@@ -694,6 +696,7 @@ static int nfs_fs_context_parse_param(struct fs_context *fc,
 		break;
 
 	case Opt_proto:
+		trace_nfs_mount_assign(param->key, param->string);
 		protofamily = AF_INET;
 		switch (lookup_constant(nfs_xprt_protocol_tokens, param->string, -1)) {
 		case Opt_xprt_udp6:
@@ -729,6 +732,7 @@ static int nfs_fs_context_parse_param(struct fs_context *fc,
 		break;
 
 	case Opt_mountproto:
+		trace_nfs_mount_assign(param->key, param->string);
 		mountfamily = AF_INET;
 		switch (lookup_constant(nfs_xprt_protocol_tokens, param->string, -1)) {
 		case Opt_xprt_udp6:
@@ -751,6 +755,7 @@ static int nfs_fs_context_parse_param(struct fs_context *fc,
 		break;
 
 	case Opt_addr:
+		trace_nfs_mount_assign(param->key, param->string);
 		len = rpc_pton(fc->net_ns, param->string, param->size,
 			       &ctx->nfs_server.address,
 			       sizeof(ctx->nfs_server._address));
@@ -759,16 +764,19 @@ static int nfs_fs_context_parse_param(struct fs_context *fc,
 		ctx->nfs_server.addrlen = len;
 		break;
 	case Opt_clientaddr:
+		trace_nfs_mount_assign(param->key, param->string);
 		kfree(ctx->client_address);
 		ctx->client_address = param->string;
 		param->string = NULL;
 		break;
 	case Opt_mounthost:
+		trace_nfs_mount_assign(param->key, param->string);
 		kfree(ctx->mount_server.hostname);
 		ctx->mount_server.hostname = param->string;
 		param->string = NULL;
 		break;
 	case Opt_mountaddr:
+		trace_nfs_mount_assign(param->key, param->string);
 		len = rpc_pton(fc->net_ns, param->string, param->size,
 			       &ctx->mount_server.address,
 			       sizeof(ctx->mount_server._address));
@@ -846,7 +854,6 @@ static int nfs_fs_context_parse_param(struct fs_context *fc,
 		 */
 	case Opt_sloppy:
 		ctx->sloppy = true;
-		dfprintk(MOUNT, "NFS:   relaxing parsing rules\n");
 		break;
 	}
 
@@ -879,10 +886,8 @@ static int nfs_parse_source(struct fs_context *fc,
 	size_t len;
 	const char *end;
 
-	if (unlikely(!dev_name || !*dev_name)) {
-		dfprintk(MOUNT, "NFS: device name not specified\n");
+	if (unlikely(!dev_name || !*dev_name))
 		return -EINVAL;
-	}
 
 	/* Is the host name protected with square brakcets? */
 	if (*dev_name == '[') {
@@ -922,7 +927,7 @@ static int nfs_parse_source(struct fs_context *fc,
 	if (!ctx->nfs_server.export_path)
 		goto out_nomem;
 
-	dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", ctx->nfs_server.export_path);
+	trace_nfs_mount_path(ctx->nfs_server.export_path);
 	return 0;
 
 out_bad_devname:
@@ -1116,7 +1121,6 @@ static int nfs23_parse_monolithic(struct fs_context *fc,
 	return nfs_invalf(fc, "NFS: nfs_mount_data version supports only AUTH_SYS");
 
 out_nomem:
-	dfprintk(MOUNT, "NFS: not enough memory to handle mount options");
 	return -ENOMEM;
 
 out_no_address:
@@ -1248,7 +1252,7 @@ static int nfs4_parse_monolithic(struct fs_context *fc,
 	if (IS_ERR(c))
 		return PTR_ERR(c);
 	ctx->nfs_server.export_path = c;
-	dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
+	trace_nfs_mount_path(c);
 
 	c = strndup_user(data->client_addr.data, 16);
 	if (IS_ERR(c))

fs/nfs/nfstrace.h

@@ -1678,6 +1678,65 @@ TRACE_EVENT(nfs_fh_to_dentry,
 		)
 );
 
+TRACE_EVENT(nfs_mount_assign,
+	TP_PROTO(
+		const char *option,
+		const char *value
+	),
+
+	TP_ARGS(option, value),
+
+	TP_STRUCT__entry(
+		__string(option, option)
+		__string(value, value)
+	),
+
+	TP_fast_assign(
+		__assign_str(option, option);
+		__assign_str(value, value);
+	),
+
+	TP_printk("option %s=%s",
+		__get_str(option), __get_str(value)
+	)
+);
+
+TRACE_EVENT(nfs_mount_option,
+	TP_PROTO(
+		const struct fs_parameter *param
+	),
+
+	TP_ARGS(param),
+
+	TP_STRUCT__entry(
+		__string(option, param->key)
+	),
+
+	TP_fast_assign(
+		__assign_str(option, param->key);
+	),
+
+	TP_printk("option %s", __get_str(option))
+);
+
+TRACE_EVENT(nfs_mount_path,
+	TP_PROTO(
+		const char *path
+	),
+
+	TP_ARGS(path),
+
+	TP_STRUCT__entry(
+		__string(path, path)
+	),
+
+	TP_fast_assign(
+		__assign_str(path, path);
+	),
+
+	TP_printk("path='%s'", __get_str(path))
+);
+
 DECLARE_EVENT_CLASS(nfs_xdr_event,
 		TP_PROTO(
 			const struct xdr_stream *xdr,