4 files changed, 48 insertions, 2 deletions

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 095431a35722..f80c3997d24c 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -780,6 +780,29 @@ nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 }
 
 static __be32
+nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
+              struct nfsd4_secinfo_no_name *sin)
+{
+        __be32 err;
+
+        switch (sin->sin_style) {
+        case NFS4_SECINFO_STYLE4_CURRENT_FH:
+                break;
+        case NFS4_SECINFO_STYLE4_PARENT:
+                err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
+                if (err)
+                        return err;
+                break;
+        default:
+                return nfserr_inval;
+        }
+        exp_get(cstate->current_fh.fh_export);
+        sin->sin_exp = cstate->current_fh.fh_export;
+        fh_put(&cstate->current_fh);
+        return nfs_ok;
+}
+
+static __be32
 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
               struct nfsd4_setattr *setattr)
 {
@@ -1327,6 +1350,10 @@ static struct nfsd4_operation nfsd4_ops[] = {
                 .op_flags = ALLOWED_WITHOUT_FH,
                 .op_name = "OP_RECLAIM_COMPLETE",
         },
+        [OP_SECINFO_NO_NAME] = {
+                .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
+                .op_name = "OP_SECINFO_NO_NAME",
+        },
 };
 
 static const char *nfsd4_op_name(unsigned opnum)
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 71d7d339e44a..b543b2410b54 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -847,6 +847,17 @@ nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
 }
 
 static __be32
+nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
+                     struct nfsd4_secinfo_no_name *sin)
+{
+        DECODE_HEAD;
+
+        READ_BUF(4);
+        READ32(sin->sin_style);
+        DECODE_TAIL;
+}
+
+static __be32
 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 {
         __be32 status;
@@ -1358,7 +1369,7 @@ static nfsd4_dec nfsd41_dec_ops[] = {
         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
-        [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_notsupp,
+        [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_notsupp,
@@ -3162,7 +3173,7 @@ static nfsd4_enc nfsd4_enc_ops[] = {
         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
-        [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_noop,
+        [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo,
         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index 60fce3dc5cb5..799c30c3b495 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -311,6 +311,11 @@ struct nfsd4_secinfo {
         struct svc_export *si_exp;                      /* response */
 };
 
+struct nfsd4_secinfo_no_name {
+        u32 sin_style;                                  /* request */
+        struct svc_export *sin_exp;                     /* response */
+};
+
 struct nfsd4_setattr {
         stateid_t       sa_stateid;         /* request */
         u32             sa_bmval[3];        /* request */
diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h
index 4925b22219d2..26afa3021ed6 100644
--- a/include/linux/nfs4.h
+++ b/include/linux/nfs4.h
@@ -136,6 +136,9 @@
 #define SEQ4_STATUS_CB_PATH_DOWN_SESSION        0x00000200
 #define SEQ4_STATUS_BACKCHANNEL_FAULT           0x00000400
 
+#define NFS4_SECINFO_STYLE4_CURRENT_FH  0
+#define NFS4_SECINFO_STYLE4_PARENT      1
+
 #define NFS4_MAX_UINT64 (~(u64)0)
 
 /* An NFS4 sessions server must support at least NFS4_MAX_OPS operations.