[PATCH v2 7/8] NFSv4: Add O_DENY* open flags support

[Pavel Shilovsky]

by passing these flags to NFSv4 open request.

Signed-off-by: Pavel Shilovsky <pias...@etersoft.ru>
---
 fs/nfs/nfs4xdr.c | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 40836ee..0a0cd1e 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -1322,7 +1322,8 @@ static void encode_lookup(struct xdr_stream *xdr, const 
struct qstr *name, struc
        encode_string(xdr, name->len, name->name);
 }
 
-static void encode_share_access(struct xdr_stream *xdr, fmode_t fmode)
+static void encode_share_access(struct xdr_stream *xdr, fmode_t fmode,
+                               int open_flags)
 {
        __be32 *p;
 
@@ -1340,7 +1341,22 @@ static void encode_share_access(struct xdr_stream *xdr, 
fmode_t fmode)
        default:
                *p++ = cpu_to_be32(0);
        }
-       *p = cpu_to_be32(0);            /* for linux, share_deny = 0 always */
+       if (open_flags & O_DENYMAND) {
+               switch (open_flags & (O_DENYREAD|O_DENYWRITE)) {
+               case O_DENYREAD:
+                       *p = cpu_to_be32(NFS4_SHARE_DENY_READ);
+                       break;
+               case O_DENYWRITE:
+                       *p = cpu_to_be32(NFS4_SHARE_DENY_WRITE);
+                       break;
+               case O_DENYREAD|O_DENYWRITE:
+                       *p = cpu_to_be32(NFS4_SHARE_DENY_BOTH);
+                       break;
+               default:
+                       *p = cpu_to_be32(0);
+               }
+       } else
+               *p = cpu_to_be32(0);
 }
 
 static inline void encode_openhdr(struct xdr_stream *xdr, const struct 
nfs_openargs *arg)
@@ -1351,7 +1367,7 @@ static inline void encode_openhdr(struct xdr_stream *xdr, 
const struct nfs_opena
  * owner 4 = 32
  */
        encode_nfs4_seqid(xdr, arg->seqid);
-       encode_share_access(xdr, arg->fmode);
+       encode_share_access(xdr, arg->fmode, arg->open_flags);
        p = reserve_space(xdr, 36);
        p = xdr_encode_hyper(p, arg->clientid);
        *p++ = cpu_to_be32(24);
@@ -1489,7 +1505,7 @@ static void encode_open_downgrade(struct xdr_stream *xdr, 
const struct nfs_close
        encode_op_hdr(xdr, OP_OPEN_DOWNGRADE, decode_open_downgrade_maxsz, hdr);
        encode_nfs4_stateid(xdr, arg->stateid);
        encode_nfs4_seqid(xdr, arg->seqid);
-       encode_share_access(xdr, arg->fmode);
+       encode_share_access(xdr, arg->fmode, 0);
 }
 
 static void
-- 
1.8.1.1