[RFC,v1,01/18] NFSD add ca_source_server<> to COPY
diff mbox

Message ID 20170302160142.30413-2-kolga@netapp.com
State New
Headers show

Commit Message

Olga Kornievskaia March 2, 2017, 4:01 p.m. UTC
From: Andy Adamson <andros@netapp.com>

Note: followed conventions and have struct nfsd4_compoundargs pointer as a
parameter even though it is unused.

Signed-off-by: Andy Adamson <andros@netapp.com>
---
 fs/nfsd/nfs4xdr.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++--
 fs/nfsd/xdr4.h    |  4 +++
 2 files changed, 77 insertions(+), 2 deletions(-)

Comments

J. Bruce Fields Sept. 1, 2017, 7:52 p.m. UTC | #1
On Thu, Mar 02, 2017 at 11:01:25AM -0500, Olga Kornievskaia wrote:
> From: Andy Adamson <andros@netapp.com>
> 
> Note: followed conventions and have struct nfsd4_compoundargs pointer as a
> parameter even though it is unused.

I'd understand if nfsd4_decode_nl4_server was an op decoder, but it
looks like it's called by some other decoder?  In which case, there's no
need for the unused argument.

I can't find the definition for struct nl4_server anyway, was this
supposed to apply on top of another set of patches?

So if you send a COPY request with a source server list to the current
(unpatched) server, it looks like you just get back BADXDR?  That sounds
like a bug in the current server.  But I suppose the client may be stuck
with that behavior.  How does the client handle that error from COPY?

--b.

> 
> Signed-off-by: Andy Adamson <andros@netapp.com>
> ---
>  fs/nfsd/nfs4xdr.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++--
>  fs/nfsd/xdr4.h    |  4 +++
>  2 files changed, 77 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
> index 382c1fd..f62cbad 100644
> --- a/fs/nfsd/nfs4xdr.c
> +++ b/fs/nfsd/nfs4xdr.c
> @@ -41,6 +41,7 @@
>  #include <linux/utsname.h>
>  #include <linux/pagemap.h>
>  #include <linux/sunrpc/svcauth_gss.h>
> +#include <linux/sunrpc/addr.h>
>  
>  #include "idmap.h"
>  #include "acl.h"
> @@ -1726,11 +1727,58 @@ static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, str
>  	DECODE_TAIL;
>  }
>  
> +static __be32 nfsd4_decode_nl4_server(struct nfsd4_compoundargs *argp,
> +				      struct nl4_server *ns)
> +{
> +	DECODE_HEAD;
> +	struct nfs42_netaddr *naddr;
> +
> +	READ_BUF(4);
> +	ns->nl4_type = be32_to_cpup(p++);
> +
> +	/* currently support for 1 inter-server source server */
> +	switch (ns->nl4_type) {
> +	case NL4_NAME:
> +	case NL4_URL:
> +		READ_BUF(4);
> +		ns->u.nl4_str_sz = be32_to_cpup(p++);
> +		if (ns->u.nl4_str_sz > NFS4_OPAQUE_LIMIT)
> +			goto xdr_error;
> +
> +		READ_BUF(ns->u.nl4_str_sz);
> +		COPYMEM(ns->u.nl4_str,
> +			ns->u.nl4_str_sz);
> +		break;
> +	case NL4_NETADDR:
> +		naddr = &ns->u.nl4_addr;
> +
> +		READ_BUF(4);
> +		naddr->na_netid_len = be32_to_cpup(p++);
> +		if (naddr->na_netid_len > RPCBIND_MAXNETIDLEN)
> +			goto xdr_error;
> +
> +		READ_BUF(naddr->na_netid_len + 4); /* 4 for uaddr len */
> +		COPYMEM(naddr->na_netid, naddr->na_netid_len);
> +
> +		naddr->na_uaddr_len = be32_to_cpup(p++);
> +		if (naddr->na_uaddr_len > RPCBIND_MAXUADDRLEN)
> +			goto xdr_error;
> +
> +		READ_BUF(naddr->na_uaddr_len);
> +		COPYMEM(naddr->na_uaddr, naddr->na_uaddr_len);
> +		break;
> +	default:
> +		goto xdr_error;
> +	}
> +	DECODE_TAIL;
> +}
> +
>  static __be32
>  nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
>  {
>  	DECODE_HEAD;
> -	unsigned int tmp;
> +	struct nl4_server *ns;
> +	int i;
>  
>  	status = nfsd4_decode_stateid(argp, &copy->cp_src_stateid);
>  	if (status)
> @@ -1745,8 +1793,29 @@ static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, str
>  	p = xdr_decode_hyper(p, &copy->cp_count);
>  	copy->cp_consecutive = be32_to_cpup(p++);
>  	copy->cp_synchronous = be32_to_cpup(p++);
> -	tmp = be32_to_cpup(p); /* Source server list not supported */
> +	copy->cp_src.nl_nsvr = be32_to_cpup(p++);
>  
> +	if (copy->cp_src.nl_nsvr == 0) /* intra-server copy */
> +		goto intra;
> +
> +	/** Support NFSD4_MAX_SSC_SRC number of source servers.
> +	 * freed in nfsd4_encode_copy
> +	 */
> +	if (copy->cp_src.nl_nsvr > NFSD4_MAX_SSC_SRC)
> +		copy->cp_src.nl_nsvr = NFSD4_MAX_SSC_SRC;
> +	copy->cp_src.nl_svr = kmalloc(copy->cp_src.nl_nsvr *
> +					sizeof(struct nl4_server), GFP_KERNEL);
> +	if (copy->cp_src.nl_svr == NULL)
> +		return nfserrno(-ENOMEM);
> +
> +	ns = copy->cp_src.nl_svr;
> +	for (i = 0; i < copy->cp_src.nl_nsvr; i++) {
> +		status = nfsd4_decode_nl4_server(argp, ns);
> +		if (status)
> +			return status;
> +		ns++;
> +	}
> +intra:
>  	DECODE_TAIL;
>  }
>  
> @@ -4295,6 +4364,8 @@ static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
>  		*p++ = cpu_to_be32(copy->cp_consecutive);
>  		*p++ = cpu_to_be32(copy->cp_synchronous);
>  	}
> +	/* allocated in nfsd4_decode_copy */
> +	kfree(copy->cp_src.nl_svr);
>  	return nfserr;
>  }
>  
> diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
> index 8fda4ab..6b1a61fc 100644
> --- a/fs/nfsd/xdr4.h
> +++ b/fs/nfsd/xdr4.h
> @@ -509,6 +509,9 @@ struct nfsd42_write_res {
>  	nfs4_verifier		wr_verifier;
>  };
>  
> +/*  support 1 source server for now */
> +#define NFSD4_MAX_SSC_SRC       1
> +
>  struct nfsd4_copy {
>  	/* request */
>  	stateid_t	cp_src_stateid;
> @@ -516,6 +519,7 @@ struct nfsd4_copy {
>  	u64		cp_src_pos;
>  	u64		cp_dst_pos;
>  	u64		cp_count;
> +	struct nl4_servers cp_src;
>  
>  	/* both */
>  	bool		cp_consecutive;
> -- 
> 1.8.3.1
> 
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Olga Kornievskaia Sept. 1, 2017, 8:14 p.m. UTC | #2
> On Sep 1, 2017, at 3:52 PM, J. Bruce Fields <bfields@redhat.com> wrote:
> 
> On Thu, Mar 02, 2017 at 11:01:25AM -0500, Olga Kornievskaia wrote:
>> From: Andy Adamson <andros@netapp.com>
>> 
>> Note: followed conventions and have struct nfsd4_compoundargs pointer as a
>> parameter even though it is unused.
> 
> I'd understand if nfsd4_decode_nl4_server was an op decoder, but it
> looks like it's called by some other decoder?  In which case, there's no
> need for the unused argument.
> 
> I can't find the definition for struct nl4_server anyway, was this
> supposed to apply on top of another set of patches?

nl4_server is defined in patch 16 “NFS NFSD defining nl4_servers structure need by both”

> So if you send a COPY request with a source server list to the current
> (unpatched) server, it looks like you just get back BADXDR?

No it fails with ERR_STALE because unpatched server doesn’t have patch 0027 
"NFSD allow inter server COPY to have a STALE source server fh"

> That sounds
> like a bug in the current server.  But I suppose the client may be stuck
> with that behavior.  How does the client handle that error from COPY?

Client fails the copy with EIO.

> 
> --b.
> 
>> 
>> Signed-off-by: Andy Adamson <andros@netapp.com>
>> ---
>> fs/nfsd/nfs4xdr.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++--
>> fs/nfsd/xdr4.h    |  4 +++
>> 2 files changed, 77 insertions(+), 2 deletions(-)
>> 
>> diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
>> index 382c1fd..f62cbad 100644
>> --- a/fs/nfsd/nfs4xdr.c
>> +++ b/fs/nfsd/nfs4xdr.c
>> @@ -41,6 +41,7 @@
>> #include <linux/utsname.h>
>> #include <linux/pagemap.h>
>> #include <linux/sunrpc/svcauth_gss.h>
>> +#include <linux/sunrpc/addr.h>
>> 
>> #include "idmap.h"
>> #include "acl.h"
>> @@ -1726,11 +1727,58 @@ static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, str
>> 	DECODE_TAIL;
>> }
>> 
>> +static __be32 nfsd4_decode_nl4_server(struct nfsd4_compoundargs *argp,
>> +				      struct nl4_server *ns)
>> +{
>> +	DECODE_HEAD;
>> +	struct nfs42_netaddr *naddr;
>> +
>> +	READ_BUF(4);
>> +	ns->nl4_type = be32_to_cpup(p++);
>> +
>> +	/* currently support for 1 inter-server source server */
>> +	switch (ns->nl4_type) {
>> +	case NL4_NAME:
>> +	case NL4_URL:
>> +		READ_BUF(4);
>> +		ns->u.nl4_str_sz = be32_to_cpup(p++);
>> +		if (ns->u.nl4_str_sz > NFS4_OPAQUE_LIMIT)
>> +			goto xdr_error;
>> +
>> +		READ_BUF(ns->u.nl4_str_sz);
>> +		COPYMEM(ns->u.nl4_str,
>> +			ns->u.nl4_str_sz);
>> +		break;
>> +	case NL4_NETADDR:
>> +		naddr = &ns->u.nl4_addr;
>> +
>> +		READ_BUF(4);
>> +		naddr->na_netid_len = be32_to_cpup(p++);
>> +		if (naddr->na_netid_len > RPCBIND_MAXNETIDLEN)
>> +			goto xdr_error;
>> +
>> +		READ_BUF(naddr->na_netid_len + 4); /* 4 for uaddr len */
>> +		COPYMEM(naddr->na_netid, naddr->na_netid_len);
>> +
>> +		naddr->na_uaddr_len = be32_to_cpup(p++);
>> +		if (naddr->na_uaddr_len > RPCBIND_MAXUADDRLEN)
>> +			goto xdr_error;
>> +
>> +		READ_BUF(naddr->na_uaddr_len);
>> +		COPYMEM(naddr->na_uaddr, naddr->na_uaddr_len);
>> +		break;
>> +	default:
>> +		goto xdr_error;
>> +	}
>> +	DECODE_TAIL;
>> +}
>> +
>> static __be32
>> nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
>> {
>> 	DECODE_HEAD;
>> -	unsigned int tmp;
>> +	struct nl4_server *ns;
>> +	int i;
>> 
>> 	status = nfsd4_decode_stateid(argp, &copy->cp_src_stateid);
>> 	if (status)
>> @@ -1745,8 +1793,29 @@ static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, str
>> 	p = xdr_decode_hyper(p, &copy->cp_count);
>> 	copy->cp_consecutive = be32_to_cpup(p++);
>> 	copy->cp_synchronous = be32_to_cpup(p++);
>> -	tmp = be32_to_cpup(p); /* Source server list not supported */
>> +	copy->cp_src.nl_nsvr = be32_to_cpup(p++);
>> 
>> +	if (copy->cp_src.nl_nsvr == 0) /* intra-server copy */
>> +		goto intra;
>> +
>> +	/** Support NFSD4_MAX_SSC_SRC number of source servers.
>> +	 * freed in nfsd4_encode_copy
>> +	 */
>> +	if (copy->cp_src.nl_nsvr > NFSD4_MAX_SSC_SRC)
>> +		copy->cp_src.nl_nsvr = NFSD4_MAX_SSC_SRC;
>> +	copy->cp_src.nl_svr = kmalloc(copy->cp_src.nl_nsvr *
>> +					sizeof(struct nl4_server), GFP_KERNEL);
>> +	if (copy->cp_src.nl_svr == NULL)
>> +		return nfserrno(-ENOMEM);
>> +
>> +	ns = copy->cp_src.nl_svr;
>> +	for (i = 0; i < copy->cp_src.nl_nsvr; i++) {
>> +		status = nfsd4_decode_nl4_server(argp, ns);
>> +		if (status)
>> +			return status;
>> +		ns++;
>> +	}
>> +intra:
>> 	DECODE_TAIL;
>> }
>> 
>> @@ -4295,6 +4364,8 @@ static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
>> 		*p++ = cpu_to_be32(copy->cp_consecutive);
>> 		*p++ = cpu_to_be32(copy->cp_synchronous);
>> 	}
>> +	/* allocated in nfsd4_decode_copy */
>> +	kfree(copy->cp_src.nl_svr);
>> 	return nfserr;
>> }
>> 
>> diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
>> index 8fda4ab..6b1a61fc 100644
>> --- a/fs/nfsd/xdr4.h
>> +++ b/fs/nfsd/xdr4.h
>> @@ -509,6 +509,9 @@ struct nfsd42_write_res {
>> 	nfs4_verifier		wr_verifier;
>> };
>> 
>> +/*  support 1 source server for now */
>> +#define NFSD4_MAX_SSC_SRC       1
>> +
>> struct nfsd4_copy {
>> 	/* request */
>> 	stateid_t	cp_src_stateid;
>> @@ -516,6 +519,7 @@ struct nfsd4_copy {
>> 	u64		cp_src_pos;
>> 	u64		cp_dst_pos;
>> 	u64		cp_count;
>> +	struct nl4_servers cp_src;
>> 
>> 	/* both */
>> 	bool		cp_consecutive;
>> -- 
>> 1.8.3.1
>> 

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Patch
diff mbox

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 382c1fd..f62cbad 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -41,6 +41,7 @@ 
 #include <linux/utsname.h>
 #include <linux/pagemap.h>
 #include <linux/sunrpc/svcauth_gss.h>
+#include <linux/sunrpc/addr.h>
 
 #include "idmap.h"
 #include "acl.h"
@@ -1726,11 +1727,58 @@  static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, str
 	DECODE_TAIL;
 }
 
+static __be32 nfsd4_decode_nl4_server(struct nfsd4_compoundargs *argp,
+				      struct nl4_server *ns)
+{
+	DECODE_HEAD;
+	struct nfs42_netaddr *naddr;
+
+	READ_BUF(4);
+	ns->nl4_type = be32_to_cpup(p++);
+
+	/* currently support for 1 inter-server source server */
+	switch (ns->nl4_type) {
+	case NL4_NAME:
+	case NL4_URL:
+		READ_BUF(4);
+		ns->u.nl4_str_sz = be32_to_cpup(p++);
+		if (ns->u.nl4_str_sz > NFS4_OPAQUE_LIMIT)
+			goto xdr_error;
+
+		READ_BUF(ns->u.nl4_str_sz);
+		COPYMEM(ns->u.nl4_str,
+			ns->u.nl4_str_sz);
+		break;
+	case NL4_NETADDR:
+		naddr = &ns->u.nl4_addr;
+
+		READ_BUF(4);
+		naddr->na_netid_len = be32_to_cpup(p++);
+		if (naddr->na_netid_len > RPCBIND_MAXNETIDLEN)
+			goto xdr_error;
+
+		READ_BUF(naddr->na_netid_len + 4); /* 4 for uaddr len */
+		COPYMEM(naddr->na_netid, naddr->na_netid_len);
+
+		naddr->na_uaddr_len = be32_to_cpup(p++);
+		if (naddr->na_uaddr_len > RPCBIND_MAXUADDRLEN)
+			goto xdr_error;
+
+		READ_BUF(naddr->na_uaddr_len);
+		COPYMEM(naddr->na_uaddr, naddr->na_uaddr_len);
+		break;
+	default:
+		goto xdr_error;
+	}
+	DECODE_TAIL;
+}
+
 static __be32
 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
 {
 	DECODE_HEAD;
-	unsigned int tmp;
+	struct nl4_server *ns;
+	int i;
 
 	status = nfsd4_decode_stateid(argp, &copy->cp_src_stateid);
 	if (status)
@@ -1745,8 +1793,29 @@  static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, str
 	p = xdr_decode_hyper(p, &copy->cp_count);
 	copy->cp_consecutive = be32_to_cpup(p++);
 	copy->cp_synchronous = be32_to_cpup(p++);
-	tmp = be32_to_cpup(p); /* Source server list not supported */
+	copy->cp_src.nl_nsvr = be32_to_cpup(p++);
 
+	if (copy->cp_src.nl_nsvr == 0) /* intra-server copy */
+		goto intra;
+
+	/** Support NFSD4_MAX_SSC_SRC number of source servers.
+	 * freed in nfsd4_encode_copy
+	 */
+	if (copy->cp_src.nl_nsvr > NFSD4_MAX_SSC_SRC)
+		copy->cp_src.nl_nsvr = NFSD4_MAX_SSC_SRC;
+	copy->cp_src.nl_svr = kmalloc(copy->cp_src.nl_nsvr *
+					sizeof(struct nl4_server), GFP_KERNEL);
+	if (copy->cp_src.nl_svr == NULL)
+		return nfserrno(-ENOMEM);
+
+	ns = copy->cp_src.nl_svr;
+	for (i = 0; i < copy->cp_src.nl_nsvr; i++) {
+		status = nfsd4_decode_nl4_server(argp, ns);
+		if (status)
+			return status;
+		ns++;
+	}
+intra:
 	DECODE_TAIL;
 }
 
@@ -4295,6 +4364,8 @@  static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
 		*p++ = cpu_to_be32(copy->cp_consecutive);
 		*p++ = cpu_to_be32(copy->cp_synchronous);
 	}
+	/* allocated in nfsd4_decode_copy */
+	kfree(copy->cp_src.nl_svr);
 	return nfserr;
 }
 
diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index 8fda4ab..6b1a61fc 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -509,6 +509,9 @@  struct nfsd42_write_res {
 	nfs4_verifier		wr_verifier;
 };
 
+/*  support 1 source server for now */
+#define NFSD4_MAX_SSC_SRC       1
+
 struct nfsd4_copy {
 	/* request */
 	stateid_t	cp_src_stateid;
@@ -516,6 +519,7 @@  struct nfsd4_copy {
 	u64		cp_src_pos;
 	u64		cp_dst_pos;
 	u64		cp_count;
+	struct nl4_servers cp_src;
 
 	/* both */
 	bool		cp_consecutive;