[PATCH 1/3] NFSv4: Send implementation id with exchange_id

[PATCH 1/3] NFSv4: Send implementation id with exchange_id

[Weston Andros Adamson]

Send the nfs implementation id in EXCHANGE_ID requests unless the module
parameter nfs.send_implementation_id is 0.

This adds a CONFIG variable for the nii_domain that defaults to "kernel.org".

Signed-off-by: Weston Andros Adamson <dros@netapp.com>
---
Update: Applied Trond's comments

 Documentation/kernel-parameters.txt |    9 +++++++
 fs/nfs/Kconfig                      |   12 ++++++++++
 fs/nfs/nfs4xdr.c                    |   41 +++++++++++++++++++++++++++++++++-
 3 files changed, 60 insertions(+), 2 deletions(-)

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 1d369c6..7bae0fd 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1678,6 +1678,15 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 			back to using the idmapper.
 			To turn off this behaviour, set the value to '0'.
 
+	nfs.send_implementation_id =
+			[NFSv4.1] Send client implementation identification
+			information in exchange_id requests.
+			If zero, no implementation identification information
+			will be sent.
+			The default is to send the implementation identification
+			information.
+
+
 	nmi_debug=	[KNL,AVR32,SH] Specify one or more actions to take
 			when a NMI is triggered.
 			Format: [state][,regs][,debounce][,die]
diff --git a/fs/nfs/Kconfig b/fs/nfs/Kconfig
index ee86cfc..7bce64c 100644
--- a/fs/nfs/Kconfig
+++ b/fs/nfs/Kconfig
@@ -99,6 +99,18 @@ config PNFS_OBJLAYOUT
 	depends on NFS_FS && NFS_V4_1 && SCSI_OSD_ULD
 	default m
 
+config NFS_V4_1_IMPLEMENTATION_ID_DOMAIN
+	string "NFSv4.1 Implementation ID Domain"
+	depends on NFS_V4_1
+	default "kernel.org"
+	help
+	  This option defines the domain portion of the implementation ID that
+	  may be sent in the NFS exchange_id operation.  The value must be in
+	  the format of a DNS domain name and should be set to the DNS domain
+	  name of the distribution.
+	  If the NFS client is unchanged from the upstream kernel, this
+	  option should be set to the default "kernel.org".
+
 config ROOT_NFS
 	bool "Root file system on NFS"
 	depends on NFS_FS=y && IP_PNP
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index ae78343..d824aed 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -44,6 +44,8 @@
 #include <linux/pagemap.h>
 #include <linux/proc_fs.h>
 #include <linux/kdev_t.h>
+#include <linux/module.h>
+#include <linux/utsname.h>
 #include <linux/sunrpc/clnt.h>
 #include <linux/sunrpc/msg_prot.h>
 #include <linux/sunrpc/gss_api.h>
@@ -271,7 +273,12 @@ static int nfs4_stat_to_errno(int);
 				1 /* flags */ + \
 				1 /* spa_how */ + \
 				0 /* SP4_NONE (for now) */ + \
-				1 /* zero implemetation id array */)
+				1 /* implementation id array of size 1 */ + \
+				1 /* nii_domain */ + \
+				XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
+				1 /* nii_name */ + \
+				XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
+				3 /* nii_date */)
 #define decode_exchange_id_maxsz (op_decode_hdr_maxsz + \
 				2 /* eir_clientid */ + \
 				1 /* eir_sequenceid */ + \
@@ -838,6 +845,12 @@ const u32 nfs41_maxread_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
 				    XDR_UNIT);
 #endif /* CONFIG_NFS_V4_1 */
 
+static unsigned short send_implementation_id = 1;
+
+module_param(send_implementation_id, ushort, 0644);
+MODULE_PARM_DESC(send_implementation_id,
+		"Send implementation ID with NFSv4.1 exchange_id");
+
 static const umode_t nfs_type2fmt[] = {
 	[NF4BAD] = 0,
 	[NF4REG] = S_IFREG,
@@ -1766,6 +1779,8 @@ static void encode_exchange_id(struct xdr_stream *xdr,
 			       struct compound_hdr *hdr)
 {
 	__be32 *p;
+	char impl_name[NFS4_OPAQUE_LIMIT];
+	int len = 0;
 
 	p = reserve_space(xdr, 4 + sizeof(args->verifier->data));
 	*p++ = cpu_to_be32(OP_EXCHANGE_ID);
@@ -1776,7 +1791,29 @@ static void encode_exchange_id(struct xdr_stream *xdr,
 	p = reserve_space(xdr, 12);
 	*p++ = cpu_to_be32(args->flags);
 	*p++ = cpu_to_be32(0);	/* zero length state_protect4_a */
-	*p = cpu_to_be32(0);	/* zero length implementation id array */
+
+	if (send_implementation_id &&
+	    sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN) > 1 &&
+	    sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN)
+		<= NFS4_OPAQUE_LIMIT + 1)
+		len = snprintf(impl_name, sizeof(impl_name), "%s %s %s %s",
+			       utsname()->sysname, utsname()->release,
+			       utsname()->version, utsname()->machine);
+
+	if (len > 0) {
+		*p = cpu_to_be32(1);	/* implementation id array length=1 */
+
+		encode_string(xdr,
+			sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN) - 1,
+			CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN);
+		encode_string(xdr, len, impl_name);
+		/* just send zeros for nii_date - the date is in nii_name */
+		p = reserve_space(xdr, 12);
+		p = xdr_encode_hyper(p, 0);
+		*p = cpu_to_be32(0);
+	} else
+		*p = cpu_to_be32(0);	/* implementation id array length=0 */
+
 	hdr->nops++;
 	hdr->replen += decode_exchange_id_maxsz;
 }
-- 
1.7.4.4

[PATCH 2/3] NFSv4: fix server_scope memory leak

[Weston Andros Adamson]

server_scope would never be freed if nfs4_check_cl_exchange_flags() returned
non-zero

Signed-off-by: Weston Andros Adamson <dros@netapp.com>
---
This should be pushed to stable@vger.kernel.org

 fs/nfs/nfs4proc.c |   15 +++++++++------
 1 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 87c584d..20c3bb0 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -4945,8 +4945,10 @@ int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
 				clp->cl_rpcclient->cl_auth->au_flavor);
 
 	res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
-	if (unlikely(!res.server_scope))
-		return -ENOMEM;
+	if (unlikely(!res.server_scope)) {
+		status = -ENOMEM;
+		goto out;
+	}
 
 	status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
 	if (!status)
@@ -4963,12 +4965,13 @@ int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
 			clp->server_scope = NULL;
 		}
 
-		if (!clp->server_scope)
+		if (!clp->server_scope) {
 			clp->server_scope = res.server_scope;
-		else
-			kfree(res.server_scope);
+			goto out;
+		}
 	}
-
+	kfree(res.server_scope);
+out:
 	dprintk("<-- %s status= %d\n", __func__, status);
 	return status;
 }
-- 
1.7.4.4

[PATCH 3/3] NFSv4: parse and display server implementation ids

[Weston Andros Adamson]

Shows the implementation ids in /proc/self/mountstats.  This doesn't break
the nfs-utils mountstats tool.

Signed-off-by: Weston Andros Adamson <dros@netapp.com>
---
 fs/nfs/client.c           |    1 +
 fs/nfs/nfs4proc.c         |   21 +++++++++++++++++++++
 fs/nfs/nfs4xdr.c          |   42 +++++++++++++++++++++++++++++++++++++-----
 fs/nfs/super.c            |    8 ++++++++
 include/linux/nfs_fs_sb.h |    2 ++
 include/linux/nfs_xdr.h   |   15 +++++++--------
 6 files changed, 76 insertions(+), 13 deletions(-)

diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index d0f850f..3fd9a47 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -302,6 +302,7 @@ static void nfs_free_client(struct nfs_client *clp)
 
 	kfree(clp->cl_hostname);
 	kfree(clp->server_scope);
+	kfree(clp->impl_id);
 	kfree(clp);
 
 	dprintk("<-- nfs_free_client()\n");
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 20c3bb0..90a17cc 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -4950,11 +4950,24 @@ int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
 		goto out;
 	}
 
+	res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_KERNEL);
+	if (unlikely(!res.impl_id)) {
+		status = -ENOMEM;
+		goto out_server_scope;
+	}
+
 	status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
 	if (!status)
 		status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
 
 	if (!status) {
+		/* use the most recent implementation id */
+		kfree(clp->impl_id);
+		clp->impl_id = res.impl_id;
+	} else
+		kfree(res.impl_id);
+
+	if (!status) {
 		if (clp->server_scope &&
 		    !nfs41_same_server_scope(clp->server_scope,
 					     res.server_scope)) {
@@ -4970,8 +4983,16 @@ int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
 			goto out;
 		}
 	}
+
+out_server_scope:
 	kfree(res.server_scope);
 out:
+	if (clp->impl_id)
+		dprintk("%s: Server Implementation ID: "
+			"domain: %s, name: %s, date: %llu,%u\n",
+			__func__, clp->impl_id->domain, clp->impl_id->name,
+			clp->impl_id->date.seconds,
+			clp->impl_id->date.nseconds);
 	dprintk("<-- %s status= %d\n", __func__, status);
 	return status;
 }
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index d824aed..b7c0433 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -291,7 +291,11 @@ static int nfs4_stat_to_errno(int);
 				/* eir_server_scope<> */ \
 				XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
 				1 /* eir_server_impl_id array length */ + \
-				0 /* ignored eir_server_impl_id contents */)
+				1 /* nii_domain */ + \
+				XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
+				1 /* nii_name */ + \
+				XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
+				3 /* nii_date */)
 #define encode_channel_attrs_maxsz  (6 + 1 /* ca_rdma_ird.len (0) */)
 #define decode_channel_attrs_maxsz  (6 + \
 				     1 /* ca_rdma_ird.len */ + \
@@ -5256,6 +5260,7 @@ static int decode_exchange_id(struct xdr_stream *xdr,
 	char *dummy_str;
 	int status;
 	struct nfs_client *clp = res->client;
+	uint32_t impl_id_count;
 
 	status = decode_op_hdr(xdr, OP_EXCHANGE_ID);
 	if (status)
@@ -5297,11 +5302,38 @@ static int decode_exchange_id(struct xdr_stream *xdr,
 	memcpy(res->server_scope->server_scope, dummy_str, dummy);
 	res->server_scope->server_scope_sz = dummy;
 
-	/* Throw away Implementation id array */
-	status = decode_opaque_inline(xdr, &dummy, &dummy_str);
-	if (unlikely(status))
-		return status;
+	/* Implementation Id */
+	p = xdr_inline_decode(xdr, 4);
+	if (unlikely(!p))
+		goto out_overflow;
+	impl_id_count = be32_to_cpup(p++);
 
+	if (impl_id_count) {
+		/* nii_domain */
+		status = decode_opaque_inline(xdr, &dummy, &dummy_str);
+		if (unlikely(status))
+			return status;
+		if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
+			return -EIO;
+		memcpy(res->impl_id->domain, dummy_str, dummy);
+
+		/* nii_name */
+		status = decode_opaque_inline(xdr, &dummy, &dummy_str);
+		if (unlikely(status))
+			return status;
+		if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
+			return -EIO;
+		memcpy(res->impl_id->name, dummy_str, dummy);
+
+		/* nii_date */
+		p = xdr_inline_decode(xdr, 12);
+		if (unlikely(!p))
+			goto out_overflow;
+		p = xdr_decode_hyper(p, &res->impl_id->date.seconds);
+		res->impl_id->date.nseconds = be32_to_cpup(p);
+
+		/* if there's more than one entry, ignore the rest */
+	}
 	return 0;
 out_overflow:
 	print_overflow_msg(__func__, xdr);
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index d05024a..5462225 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -809,6 +809,14 @@ static int nfs_show_stats(struct seq_file *m, struct dentry *root)
 
 	seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
 
+	if (nfss->nfs_client && nfss->nfs_client->impl_id) {
+		struct nfs41_impl_id *impl_id = nfss->nfs_client->impl_id;
+		seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
+			   "date='%llu,%u'",
+			   impl_id->name, impl_id->domain,
+			   impl_id->date.seconds, impl_id->date.nseconds);
+	}
+
 	seq_printf(m, "\n\tcaps:\t");
 	seq_printf(m, "caps=0x%x", nfss->caps);
 	seq_printf(m, ",wtmult=%u", nfss->wtmult);
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index 3bf4766..03d0b91 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -18,6 +18,7 @@ struct nfs4_sequence_res;
 struct nfs_server;
 struct nfs4_minor_version_ops;
 struct server_scope;
+struct nfs41_impl_id;
 
 /*
  * The nfs_client identifies our client state to the server.
@@ -86,6 +87,7 @@ struct nfs_client {
 #endif
 
 	struct server_scope	*server_scope;	/* from exchange_id */
+	struct nfs41_impl_id	*impl_id;	/* from exchange_id */
 	struct net		*net;
 };
 
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index adbc84a..046c1bf 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -1054,14 +1054,6 @@ struct nfstime4 {
 };
 
 #ifdef CONFIG_NFS_V4_1
-struct nfs_impl_id4 {
-	u32		domain_len;
-	char		*domain;
-	u32		name_len;
-	char		*name;
-	struct nfstime4	date;
-};
-
 #define NFS4_EXCHANGE_ID_LEN	(48)
 struct nfs41_exchange_id_args {
 	struct nfs_client		*client;
@@ -1082,10 +1074,17 @@ struct server_scope {
 	char 				server_scope[NFS4_OPAQUE_LIMIT];
 };
 
+struct nfs41_impl_id {
+	char				domain[NFS4_OPAQUE_LIMIT + 1];
+	char				name[NFS4_OPAQUE_LIMIT + 1];
+	struct nfstime4			date;
+};
+
 struct nfs41_exchange_id_res {
 	struct nfs_client		*client;
 	u32				flags;
 	struct server_scope		*server_scope;
+	struct nfs41_impl_id		*impl_id;
 };
 
 struct nfs41_create_session_args {
-- 
1.7.4.4

Re: [PATCH 3/3] NFSv4: parse and display server implementation ids

[Bryan Schumaker]

Hi Dros,

On 02/17/2012 03:20 PM, Weston Andros Adamson wrote:

> Shows the implementation ids in /proc/self/mountstats.  This doesn't break
> the nfs-utils mountstats tool.
> 
> Signed-off-by: Weston Andros Adamson <dros@netapp.com>
> ---
>  fs/nfs/client.c           |    1 +
>  fs/nfs/nfs4proc.c         |   21 +++++++++++++++++++++
>  fs/nfs/nfs4xdr.c          |   42 +++++++++++++++++++++++++++++++++++++-----
>  fs/nfs/super.c            |    8 ++++++++
>  include/linux/nfs_fs_sb.h |    2 ++
>  include/linux/nfs_xdr.h   |   15 +++++++--------
>  6 files changed, 76 insertions(+), 13 deletions(-)
> 

<snip>

> diff --git a/fs/nfs/super.c b/fs/nfs/super.c
> index d05024a..5462225 100644
> --- a/fs/nfs/super.c
> +++ b/fs/nfs/super.c
> @@ -809,6 +809,14 @@ static int nfs_show_stats(struct seq_file *m, struct dentry *root)
>  
>  	seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
>  
> +	if (nfss->nfs_client && nfss->nfs_client->impl_id) {
> +		struct nfs41_impl_id *impl_id = nfss->nfs_client->impl_id;


"struct nfs41_impl_id" is only defined when CONFIG_NFS_V4_1 is enabled, so if I compile without NFS 4.1 enabled I get this error:

  CC [M]  fs/nfs/super.o
/home/bjschuma/linux/modules/fs/nfs/super.c: In function 'nfs_show_stats':
/home/bjschuma/linux/modules/fs/nfs/super.c:843:14: error: dereferencing pointer to incomplete type
/home/bjschuma/linux/modules/fs/nfs/super.c:843:29: error: dereferencing pointer to incomplete type
/home/bjschuma/linux/modules/fs/nfs/super.c:844:14: error: dereferencing pointer to incomplete type
/home/bjschuma/linux/modules/fs/nfs/super.c:844:37: error: dereferencing pointer to incomplete type
make[3]: *** [fs/nfs/super.o] Error 1

- Bryan

> +		seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
> +			   "date='%llu,%u'",
> +			   impl_id->name, impl_id->domain,
> +			   impl_id->date.seconds, impl_id->date.nseconds);
> +	}
> +
>  	seq_printf(m, "\n\tcaps:\t");
>  	seq_printf(m, "caps=0x%x", nfss->caps);
>  	seq_printf(m, ",wtmult=%u", nfss->wtmult);

Re: [PATCH 3/3] NFSv4: parse and display server implementation ids

[Myklebust, Trond]

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Re: [PATCH 3/3] NFSv4: parse and display server implementation ids

[Adamson, Dros]

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On Mar 4, 2012, at 6:33 PM, Myklebust, Trond wrote:

> On Sat, 2012-03-03 at 09:09 -0500, Bryan Schumaker wrote:
>> Hi Dros,
>> 
>> On 02/17/2012 03:20 PM, Weston Andros Adamson wrote:
>> 
>>> Shows the implementation ids in /proc/self/mountstats.  This doesn't break
>>> the nfs-utils mountstats tool.
>>> 
>>> Signed-off-by: Weston Andros Adamson <dros@netapp.com>
>>> ---
>>> fs/nfs/client.c           |    1 +
>>> fs/nfs/nfs4proc.c         |   21 +++++++++++++++++++++
>>> fs/nfs/nfs4xdr.c          |   42 +++++++++++++++++++++++++++++++++++++-----
>>> fs/nfs/super.c            |    8 ++++++++
>>> include/linux/nfs_fs_sb.h |    2 ++
>>> include/linux/nfs_xdr.h   |   15 +++++++--------
>>> 6 files changed, 76 insertions(+), 13 deletions(-)
>>> 
>> 
>> <snip>
>> 
>>> diff --git a/fs/nfs/super.c b/fs/nfs/super.c
>>> index d05024a..5462225 100644
>>> --- a/fs/nfs/super.c
>>> +++ b/fs/nfs/super.c
>>> @@ -809,6 +809,14 @@ static int nfs_show_stats(struct seq_file *m, struct dentry *root)
>>> 
>>> 	seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
>>> 
>>> +	if (nfss->nfs_client && nfss->nfs_client->impl_id) {
>>> +		struct nfs41_impl_id *impl_id = nfss->nfs_client->impl_id;
>> 
>> 
>> "struct nfs41_impl_id" is only defined when CONFIG_NFS_V4_1 is enabled, so if I compile without NFS 4.1 enabled I get this error:
>> 
>>  CC [M]  fs/nfs/super.o
>> /home/bjschuma/linux/modules/fs/nfs/super.c: In function 'nfs_show_stats':
>> /home/bjschuma/linux/modules/fs/nfs/super.c:843:14: error: dereferencing pointer to incomplete type
>> /home/bjschuma/linux/modules/fs/nfs/super.c:843:29: error: dereferencing pointer to incomplete type
>> /home/bjschuma/linux/modules/fs/nfs/super.c:844:14: error: dereferencing pointer to incomplete type
>> /home/bjschuma/linux/modules/fs/nfs/super.c:844:37: error: dereferencing pointer to incomplete type
>> make[3]: *** [fs/nfs/super.o] Error 1

Oops!  Good catch Bryan!

> 
> Hi Bryan & Dros
> 
> I've applied the following patch to fix this issue. Please advise if
> you're still seeing compile problems when it is applied.
> 
> 8<----------------------------------------------------------------------------
> From d032769b833d8fbaaa620a54300979dd5881d493 Mon Sep 17 00:00:00 2001
> From: Trond Myklebust <Trond.Myklebust@netapp.com>
> Date: Sun, 4 Mar 2012 18:12:57 -0500
> Subject: [PATCH] NFS: Fix a compile issue when !CONFIG_NFS_V4_1
> 
> The attempt to display the implementation ID needs to be conditional on
> whether or not CONFIG_NFS_V4_1 is defined
> 
> Reported-by: Bryan Schumaker <Bryan.Schumaker@netapp.com>
> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
> ---
> fs/nfs/super.c |   22 +++++++++++++++-------
> 1 files changed, 15 insertions(+), 7 deletions(-)
> 
> diff --git a/fs/nfs/super.c b/fs/nfs/super.c
> index 3935a37..61419c9 100644
> --- a/fs/nfs/super.c
> +++ b/fs/nfs/super.c
> @@ -785,8 +785,22 @@ static void show_pnfs(struct seq_file *m, struct nfs_server *server)
> 	else
> 		seq_printf(m, "not configured");
> }
> +
> +static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
> +{
> +	if (nfss->nfs_client && nfss->nfs_client->impl_id) {
> +		struct nfs41_impl_id *impl_id = nfss->nfs_client->impl_id;
> +		seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
> +			   "date='%llu,%u'",
> +			   impl_id->name, impl_id->domain,
> +			   impl_id->date.seconds, impl_id->date.nseconds);
> +	}
> +}
> #else
> static void show_pnfs(struct seq_file *m, struct nfs_server *server) {}
> +static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
> +{
> +}
> #endif
> #endif
> 
> @@ -836,13 +850,7 @@ static int nfs_show_stats(struct seq_file *m, struct dentry *root)
> 
> 	seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
> 
> -	if (nfss->nfs_client && nfss->nfs_client->impl_id) {
> -		struct nfs41_impl_id *impl_id = nfss->nfs_client->impl_id;
> -		seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
> -			   "date='%llu,%u'",
> -			   impl_id->name, impl_id->domain,
> -			   impl_id->date.seconds, impl_id->date.nseconds);
> -	}
> +	show_implementation_id(m, nfss);
> 
> 	seq_printf(m, "\n\tcaps:\t");
> 	seq_printf(m, "caps=0x%x", nfss->caps);
> -- 
> 1.7.7.6

Works for me.  I need to test with different CONFIG opts more often!

-dros

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Re: [PATCH 3/3] NFSv4: parse and display server implementation ids

[Myklebust, Trond]

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Re: [PATCH 3/3] NFSv4: parse and display server implementation ids

[Bryan Schumaker]

On 03/06/2012 12:08 PM, Adamson, Dros wrote:

> 
> On Mar 4, 2012, at 6:33 PM, Myklebust, Trond wrote:
> 
>> On Sat, 2012-03-03 at 09:09 -0500, Bryan Schumaker wrote:
>>> Hi Dros,
>>>
>>> On 02/17/2012 03:20 PM, Weston Andros Adamson wrote:
>>>
>>>> Shows the implementation ids in /proc/self/mountstats.  This doesn't break
>>>> the nfs-utils mountstats tool.
>>>>
>>>> Signed-off-by: Weston Andros Adamson <dros@netapp.com>
>>>> ---
>>>> fs/nfs/client.c           |    1 +
>>>> fs/nfs/nfs4proc.c         |   21 +++++++++++++++++++++
>>>> fs/nfs/nfs4xdr.c          |   42 +++++++++++++++++++++++++++++++++++++-----
>>>> fs/nfs/super.c            |    8 ++++++++
>>>> include/linux/nfs_fs_sb.h |    2 ++
>>>> include/linux/nfs_xdr.h   |   15 +++++++--------
>>>> 6 files changed, 76 insertions(+), 13 deletions(-)
>>>>
>>>
>>> <snip>
>>>
>>>> diff --git a/fs/nfs/super.c b/fs/nfs/super.c
>>>> index d05024a..5462225 100644
>>>> --- a/fs/nfs/super.c
>>>> +++ b/fs/nfs/super.c
>>>> @@ -809,6 +809,14 @@ static int nfs_show_stats(struct seq_file *m, struct dentry *root)
>>>>
>>>> 	seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
>>>>
>>>> +	if (nfss->nfs_client && nfss->nfs_client->impl_id) {
>>>> +		struct nfs41_impl_id *impl_id = nfss->nfs_client->impl_id;
>>>
>>>
>>> "struct nfs41_impl_id" is only defined when CONFIG_NFS_V4_1 is enabled, so if I compile without NFS 4.1 enabled I get this error:
>>>
>>>  CC [M]  fs/nfs/super.o
>>> /home/bjschuma/linux/modules/fs/nfs/super.c: In function 'nfs_show_stats':
>>> /home/bjschuma/linux/modules/fs/nfs/super.c:843:14: error: dereferencing pointer to incomplete type
>>> /home/bjschuma/linux/modules/fs/nfs/super.c:843:29: error: dereferencing pointer to incomplete type
>>> /home/bjschuma/linux/modules/fs/nfs/super.c:844:14: error: dereferencing pointer to incomplete type
>>> /home/bjschuma/linux/modules/fs/nfs/super.c:844:37: error: dereferencing pointer to incomplete type
>>> make[3]: *** [fs/nfs/super.o] Error 1
> 
> Oops!  Good catch Bryan!
> 
>>
>> Hi Bryan & Dros
>>
>> I've applied the following patch to fix this issue. Please advise if
>> you're still seeing compile problems when it is applied.
>>
>> 8<----------------------------------------------------------------------------
>> From d032769b833d8fbaaa620a54300979dd5881d493 Mon Sep 17 00:00:00 2001
>> From: Trond Myklebust <Trond.Myklebust@netapp.com>
>> Date: Sun, 4 Mar 2012 18:12:57 -0500
>> Subject: [PATCH] NFS: Fix a compile issue when !CONFIG_NFS_V4_1
>>
>> The attempt to display the implementation ID needs to be conditional on
>> whether or not CONFIG_NFS_V4_1 is defined
>>
>> Reported-by: Bryan Schumaker <Bryan.Schumaker@netapp.com>
>> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
>> ---
>> fs/nfs/super.c |   22 +++++++++++++++-------
>> 1 files changed, 15 insertions(+), 7 deletions(-)
>>
>> diff --git a/fs/nfs/super.c b/fs/nfs/super.c
>> index 3935a37..61419c9 100644
>> --- a/fs/nfs/super.c
>> +++ b/fs/nfs/super.c
>> @@ -785,8 +785,22 @@ static void show_pnfs(struct seq_file *m, struct nfs_server *server)
>> 	else
>> 		seq_printf(m, "not configured");
>> }
>> +
>> +static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
>> +{
>> +	if (nfss->nfs_client && nfss->nfs_client->impl_id) {
>> +		struct nfs41_impl_id *impl_id = nfss->nfs_client->impl_id;
>> +		seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
>> +			   "date='%llu,%u'",
>> +			   impl_id->name, impl_id->domain,
>> +			   impl_id->date.seconds, impl_id->date.nseconds);
>> +	}
>> +}
>> #else
>> static void show_pnfs(struct seq_file *m, struct nfs_server *server) {}
>> +static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
>> +{
>> +}
>> #endif
>> #endif
>>
>> @@ -836,13 +850,7 @@ static int nfs_show_stats(struct seq_file *m, struct dentry *root)
>>
>> 	seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
>>
>> -	if (nfss->nfs_client && nfss->nfs_client->impl_id) {
>> -		struct nfs41_impl_id *impl_id = nfss->nfs_client->impl_id;
>> -		seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
>> -			   "date='%llu,%u'",
>> -			   impl_id->name, impl_id->domain,
>> -			   impl_id->date.seconds, impl_id->date.nseconds);
>> -	}
>> +	show_implementation_id(m, nfss);
>>
>> 	seq_printf(m, "\n\tcaps:\t");
>> 	seq_printf(m, "caps=0x%x", nfss->caps);
>> -- 
>> 1.7.7.6
> 
> Works for me.  I need to test with different CONFIG opts more often!


That's actually how I found this.  I set up Jenkins to change all the nfs CONFIG options to make sure I had everything covered for my modules patches.  I've added compile testing to my normal nightly tests now, so these issuse should be caught faster.

- Bryan

> 
> -dros

[PATCH 1/3] NFSv4: Send implementation id with exchange_id

[Weston Andros Adamson]

Send the nfs implementation id in EXCHANGE_ID requests unless the module
parameter nfs.send_implementation_id is 0.

This adds a CONFIG variable for the nii_domain that defaults to "kernel.org".

Signed-off-by: Weston Andros Adamson <dros@netapp.com>
---
 Documentation/kernel-parameters.txt |    9 ++++++++
 fs/nfs/Kconfig                      |    8 +++++++
 fs/nfs/nfs4xdr.c                    |   38 +++++++++++++++++++++++++++++++++-
 3 files changed, 53 insertions(+), 2 deletions(-)

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 1d369c6..7bae0fd 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1678,6 +1678,15 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 			back to using the idmapper.
 			To turn off this behaviour, set the value to '0'.
 
+	nfs.send_implementation_id =
+			[NFSv4.1] Send client implementation identification
+			information in exchange_id requests.
+			If zero, no implementation identification information
+			will be sent.
+			The default is to send the implementation identification
+			information.
+
+
 	nmi_debug=	[KNL,AVR32,SH] Specify one or more actions to take
 			when a NMI is triggered.
 			Format: [state][,regs][,debounce][,die]
diff --git a/fs/nfs/Kconfig b/fs/nfs/Kconfig
index ee86cfc..09f9e38 100644
--- a/fs/nfs/Kconfig
+++ b/fs/nfs/Kconfig
@@ -99,6 +99,14 @@ config PNFS_OBJLAYOUT
 	depends on NFS_FS && NFS_V4_1 && SCSI_OSD_ULD
 	default m
 
+config NFS_V4_1_IMPLEMENTATION_ID_DOMAIN
+	string "NFSv4.1 Implementation ID Domain"
+	depends on NFS_V4_1
+	default "kernel.org"
+	help
+	  This value will be used in EXCHANGE_ID compounds to help identify
+	  the client implementation.
+
 config ROOT_NFS
 	bool "Root file system on NFS"
 	depends on NFS_FS=y && IP_PNP
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index ae78343..70ded94 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -44,6 +44,8 @@
 #include <linux/pagemap.h>
 #include <linux/proc_fs.h>
 #include <linux/kdev_t.h>
+#include <linux/module.h>
+#include <linux/utsname.h>
 #include <linux/sunrpc/clnt.h>
 #include <linux/sunrpc/msg_prot.h>
 #include <linux/sunrpc/gss_api.h>
@@ -271,7 +273,12 @@ static int nfs4_stat_to_errno(int);
 				1 /* flags */ + \
 				1 /* spa_how */ + \
 				0 /* SP4_NONE (for now) */ + \
-				1 /* zero implemetation id array */)
+				1 /* implemetation id array of size 1 */ + \
+				1 /* nii_domain */ + \
+				XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
+				1 /* nii_name */ + \
+				XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
+				3 /* nii_date */)
 #define decode_exchange_id_maxsz (op_decode_hdr_maxsz + \
 				2 /* eir_clientid */ + \
 				1 /* eir_sequenceid */ + \
@@ -838,6 +845,12 @@ const u32 nfs41_maxread_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
 				    XDR_UNIT);
 #endif /* CONFIG_NFS_V4_1 */
 
+static unsigned short send_implementation_id = 1;
+
+module_param(send_implementation_id, ushort, 0644);
+MODULE_PARM_DESC(send_implementation_id,
+		"Send implementation ID with NFSv4.1 exchange_id");
+
 static const umode_t nfs_type2fmt[] = {
 	[NF4BAD] = 0,
 	[NF4REG] = S_IFREG,
@@ -1766,6 +1779,8 @@ static void encode_exchange_id(struct xdr_stream *xdr,
 			       struct compound_hdr *hdr)
 {
 	__be32 *p;
+	char impl_name[260]; /* 4 strs max 64 each, spaces and null */
+	int len = 0;
 
 	p = reserve_space(xdr, 4 + sizeof(args->verifier->data));
 	*p++ = cpu_to_be32(OP_EXCHANGE_ID);
@@ -1776,7 +1791,26 @@ static void encode_exchange_id(struct xdr_stream *xdr,
 	p = reserve_space(xdr, 12);
 	*p++ = cpu_to_be32(args->flags);
 	*p++ = cpu_to_be32(0);	/* zero length state_protect4_a */
-	*p = cpu_to_be32(0);	/* zero length implementation id array */
+
+	if (send_implementation_id)
+		len = snprintf(impl_name, sizeof(impl_name), "%s %s %s %s",
+			       utsname()->sysname, utsname()->release,
+			       utsname()->version, utsname()->machine);
+
+	if (len > 0) {
+		*p = cpu_to_be32(1);	/* implementation id array length=1 */
+
+		encode_string(xdr,
+			strlen(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN),
+			CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN);
+		encode_string(xdr, len, impl_name);
+		/* just send zeros for nii_date - the date is in nii_name */
+		p = reserve_space(xdr, 12);
+		p = xdr_encode_hyper(p, 0);
+		*p = cpu_to_be32(0);
+	} else
+		*p = cpu_to_be32(0);	/* implementation id array length=0 */
+
 	hdr->nops++;
 	hdr->replen += decode_exchange_id_maxsz;
 }
-- 
1.7.4.4

[PATCH 3/3] NFSv4: parse and display server implementation ids

[Weston Andros Adamson]

Shows the implementation ids in /proc/self/mountstats.  This doesn't break
the nfs-utils mountstats tool.

Signed-off-by: Weston Andros Adamson <dros@netapp.com>
---
 fs/nfs/client.c           |    1 +
 fs/nfs/nfs4proc.c         |   21 +++++++++++++++++++++
 fs/nfs/nfs4xdr.c          |   42 +++++++++++++++++++++++++++++++++++++-----
 fs/nfs/super.c            |    8 ++++++++
 include/linux/nfs_fs_sb.h |    2 ++
 include/linux/nfs_xdr.h   |   15 +++++++--------
 6 files changed, 76 insertions(+), 13 deletions(-)

diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index d0f850f..3fd9a47 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -302,6 +302,7 @@ static void nfs_free_client(struct nfs_client *clp)
 
 	kfree(clp->cl_hostname);
 	kfree(clp->server_scope);
+	kfree(clp->impl_id);
 	kfree(clp);
 
 	dprintk("<-- nfs_free_client()\n");
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 20c3bb0..90a17cc 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -4950,11 +4950,24 @@ int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
 		goto out;
 	}
 
+	res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_KERNEL);
+	if (unlikely(!res.impl_id)) {
+		status = -ENOMEM;
+		goto out_server_scope;
+	}
+
 	status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
 	if (!status)
 		status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
 
 	if (!status) {
+		/* use the most recent implementation id */
+		kfree(clp->impl_id);
+		clp->impl_id = res.impl_id;
+	} else
+		kfree(res.impl_id);
+
+	if (!status) {
 		if (clp->server_scope &&
 		    !nfs41_same_server_scope(clp->server_scope,
 					     res.server_scope)) {
@@ -4970,8 +4983,16 @@ int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
 			goto out;
 		}
 	}
+
+out_server_scope:
 	kfree(res.server_scope);
 out:
+	if (clp->impl_id)
+		dprintk("%s: Server Implementation ID: "
+			"domain: %s, name: %s, date: %llu,%u\n",
+			__func__, clp->impl_id->domain, clp->impl_id->name,
+			clp->impl_id->date.seconds,
+			clp->impl_id->date.nseconds);
 	dprintk("<-- %s status= %d\n", __func__, status);
 	return status;
 }
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 70ded94..6bf3fe9 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -291,7 +291,11 @@ static int nfs4_stat_to_errno(int);
 				/* eir_server_scope<> */ \
 				XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
 				1 /* eir_server_impl_id array length */ + \
-				0 /* ignored eir_server_impl_id contents */)
+				1 /* nii_domain */ + \
+				XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
+				1 /* nii_name */ + \
+				XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
+				3 /* nii_date */)
 #define encode_channel_attrs_maxsz  (6 + 1 /* ca_rdma_ird.len (0) */)
 #define decode_channel_attrs_maxsz  (6 + \
 				     1 /* ca_rdma_ird.len */ + \
@@ -5253,6 +5257,7 @@ static int decode_exchange_id(struct xdr_stream *xdr,
 	char *dummy_str;
 	int status;
 	struct nfs_client *clp = res->client;
+	uint32_t impl_id_count;
 
 	status = decode_op_hdr(xdr, OP_EXCHANGE_ID);
 	if (status)
@@ -5294,11 +5299,38 @@ static int decode_exchange_id(struct xdr_stream *xdr,
 	memcpy(res->server_scope->server_scope, dummy_str, dummy);
 	res->server_scope->server_scope_sz = dummy;
 
-	/* Throw away Implementation id array */
-	status = decode_opaque_inline(xdr, &dummy, &dummy_str);
-	if (unlikely(status))
-		return status;
+	/* Implementation Id */
+	p = xdr_inline_decode(xdr, 4);
+	if (unlikely(!p))
+		goto out_overflow;
+	impl_id_count = be32_to_cpup(p++);
 
+	if (impl_id_count) {
+		/* nii_domain */
+		status = decode_opaque_inline(xdr, &dummy, &dummy_str);
+		if (unlikely(status))
+			return status;
+		if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
+			return -EIO;
+		memcpy(res->impl_id->domain, dummy_str, dummy);
+
+		/* nii_name */
+		status = decode_opaque_inline(xdr, &dummy, &dummy_str);
+		if (unlikely(status))
+			return status;
+		if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
+			return -EIO;
+		memcpy(res->impl_id->name, dummy_str, dummy);
+
+		/* nii_date */
+		p = xdr_inline_decode(xdr, 12);
+		if (unlikely(!p))
+			goto out_overflow;
+		p = xdr_decode_hyper(p, &res->impl_id->date.seconds);
+		res->impl_id->date.nseconds = be32_to_cpup(p);
+
+		/* if there's more than one entry, ignore the rest */
+	}
 	return 0;
 out_overflow:
 	print_overflow_msg(__func__, xdr);
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index d05024a..5462225 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -809,6 +809,14 @@ static int nfs_show_stats(struct seq_file *m, struct dentry *root)
 
 	seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
 
+	if (nfss->nfs_client && nfss->nfs_client->impl_id) {
+		struct nfs41_impl_id *impl_id = nfss->nfs_client->impl_id;
+		seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
+			   "date='%llu,%u'",
+			   impl_id->name, impl_id->domain,
+			   impl_id->date.seconds, impl_id->date.nseconds);
+	}
+
 	seq_printf(m, "\n\tcaps:\t");
 	seq_printf(m, "caps=0x%x", nfss->caps);
 	seq_printf(m, ",wtmult=%u", nfss->wtmult);
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index 3bf4766..03d0b91 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -18,6 +18,7 @@ struct nfs4_sequence_res;
 struct nfs_server;
 struct nfs4_minor_version_ops;
 struct server_scope;
+struct nfs41_impl_id;
 
 /*
  * The nfs_client identifies our client state to the server.
@@ -86,6 +87,7 @@ struct nfs_client {
 #endif
 
 	struct server_scope	*server_scope;	/* from exchange_id */
+	struct nfs41_impl_id	*impl_id;	/* from exchange_id */
 	struct net		*net;
 };
 
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index adbc84a..046c1bf 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -1054,14 +1054,6 @@ struct nfstime4 {
 };
 
 #ifdef CONFIG_NFS_V4_1
-struct nfs_impl_id4 {
-	u32		domain_len;
-	char		*domain;
-	u32		name_len;
-	char		*name;
-	struct nfstime4	date;
-};
-
 #define NFS4_EXCHANGE_ID_LEN	(48)
 struct nfs41_exchange_id_args {
 	struct nfs_client		*client;
@@ -1082,10 +1074,17 @@ struct server_scope {
 	char 				server_scope[NFS4_OPAQUE_LIMIT];
 };
 
+struct nfs41_impl_id {
+	char				domain[NFS4_OPAQUE_LIMIT + 1];
+	char				name[NFS4_OPAQUE_LIMIT + 1];
+	struct nfstime4			date;
+};
+
 struct nfs41_exchange_id_res {
 	struct nfs_client		*client;
 	u32				flags;
 	struct server_scope		*server_scope;
+	struct nfs41_impl_id		*impl_id;
 };
 
 struct nfs41_create_session_args {
-- 
1.7.4.4