4 files changed, 22 insertions, 12 deletions

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 53636ff0e6a..cdb7ca33718 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -311,9 +311,6 @@ nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
                 return nfserr_inval;
 
-        /* We don't yet support WANT bits: */
-        open->op_share_access &= NFS4_SHARE_ACCESS_MASK;
-
         open->op_created = 0;
         /*
          * RFC5661 18.51.3
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index f89ccc26390..45966a436b0 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -2637,8 +2637,6 @@ nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
 
 static int share_access_to_flags(u32 share_access)
 {
-        share_access &= NFS4_SHARE_ACCESS_MASK;
-
         return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
 }
 
@@ -3600,7 +3598,9 @@ nfsd4_open_downgrade(struct svc_rqst *rqstp,
                         cstate->current_fh.fh_dentry->d_name.name);
 
         /* We don't yet support WANT bits: */
-        od->od_share_access &= NFS4_SHARE_ACCESS_MASK;
+        if (od->od_deleg_want)
+                dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
+                        od->od_deleg_want);
 
         nfs4_lock_state();
         status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 279a70548e4..d241a8571dd 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -638,14 +638,18 @@ nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup
         DECODE_TAIL;
 }
 
-static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *x)
+static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
 {
         __be32 *p;
         u32 w;
 
         READ_BUF(4);
         READ32(w);
-        *x = w;
+        *share_access = w & NFS4_SHARE_ACCESS_MASK;
+        *deleg_want = w & NFS4_SHARE_WANT_MASK;
+        if (deleg_when)
+                *deleg_when = w & NFS4_SHARE_WHEN_MASK;
+
         switch (w & NFS4_SHARE_ACCESS_MASK) {
         case NFS4_SHARE_ACCESS_READ:
         case NFS4_SHARE_ACCESS_WRITE:
@@ -673,6 +677,9 @@ static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *x)
         w &= ~NFS4_SHARE_WANT_MASK;
         if (!w)
                 return nfs_ok;
+
+        if (!deleg_when)        /* open_downgrade */
+                return nfserr_inval;
         switch (w) {
         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
@@ -719,6 +726,7 @@ static __be32
 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 {
         DECODE_HEAD;
+        u32 dummy;
 
         memset(open->op_bmval, 0, sizeof(open->op_bmval));
         open->op_iattr.ia_valid = 0;
@@ -727,7 +735,9 @@ nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
         /* seqid, share_access, share_deny, clientid, ownerlen */
         READ_BUF(4);
         READ32(open->op_seqid);
-        status = nfsd4_decode_share_access(argp, &open->op_share_access);
+        /* decode, yet ignore deleg_when until supported */
+        status = nfsd4_decode_share_access(argp, &open->op_share_access,
+                                           &open->op_deleg_want, &dummy);
         if (status)
                 goto xdr_error;
         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
@@ -848,7 +858,8 @@ nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_d
                 return status;
         READ_BUF(4);
         READ32(open_down->od_seqid);
-        status = nfsd4_decode_share_access(argp, &open_down->od_share_access);
+        status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
+                                           &open_down->od_deleg_want, NULL);
         if (status)
                 return status;
         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index 12789eb3f91..4949832fd74 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -233,6 +233,7 @@ struct nfsd4_open {
         u32             op_seqid;           /* request */
         u32             op_share_access;    /* request */
         u32             op_share_deny;      /* request */
+        u32             op_deleg_want;      /* request */
         stateid_t       op_stateid;         /* response */
         u32             op_recall;          /* recall */
         struct nfsd4_change_info  op_cinfo; /* response */
@@ -256,8 +257,9 @@ struct nfsd4_open_confirm {
 struct nfsd4_open_downgrade {
         stateid_t       od_stateid;
         u32             od_seqid;
-        u32             od_share_access;
-        u32             od_share_deny;
+        u32             od_share_access;        /* request */
+        u32             od_deleg_want;          /* request */
+        u32             od_share_deny;          /* request */
 };