NFS: Get suppattr_exclcreat when getting server capabilities

Create file with attributs as NFS4_CREATE_EXCLUSIVE4_1 mode
depends on suppattr_exclcreat attribut.

v3, same as v2.

Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

1 files changed, 21 insertions, 5 deletions

diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index c42459e45f62..ad8dde12f23b 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -2582,6 +2582,7 @@ static void nfs4_xdr_enc_server_caps(struct rpc_rqst *req,
                                      struct xdr_stream *xdr,
                                      struct nfs4_server_caps_arg *args)
 {
+        const u32 *bitmask = args->bitmask;
         struct compound_hdr hdr = {
                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
         };
@@ -2589,11 +2590,7 @@ static void nfs4_xdr_enc_server_caps(struct rpc_rqst *req,
         encode_compound_hdr(xdr, req, &hdr);
         encode_sequence(xdr, &args->seq_args, &hdr);
         encode_putfh(xdr, args->fhandle, &hdr);
-        encode_getattr_one(xdr, FATTR4_WORD0_SUPPORTED_ATTRS|
-                           FATTR4_WORD0_FH_EXPIRE_TYPE|
-                           FATTR4_WORD0_LINK_SUPPORT|
-                           FATTR4_WORD0_SYMLINK_SUPPORT|
-                           FATTR4_WORD0_ACLSUPPORT, &hdr);
+        encode_getattr_three(xdr, bitmask[0], bitmask[1], bitmask[2], &hdr);
         encode_nops(&hdr);
 }
 
@@ -3370,6 +3367,22 @@ out_overflow:
         return -EIO;
 }
 
+static int decode_attr_exclcreat_supported(struct xdr_stream *xdr,
+                                 uint32_t *bitmap, uint32_t *bitmask)
+{
+        if (likely(bitmap[2] & FATTR4_WORD2_SUPPATTR_EXCLCREAT)) {
+                int ret;
+                ret = decode_attr_bitmap(xdr, bitmask);
+                if (unlikely(ret < 0))
+                        return ret;
+                bitmap[2] &= ~FATTR4_WORD2_SUPPATTR_EXCLCREAT;
+        } else
+                bitmask[0] = bitmask[1] = bitmask[2] = 0;
+        dprintk("%s: bitmask=%08x:%08x:%08x\n", __func__,
+                bitmask[0], bitmask[1], bitmask[2]);
+        return 0;
+}
+
 static int decode_attr_filehandle(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fh *fh)
 {
         __be32 *p;
@@ -4323,6 +4336,9 @@ static int decode_server_caps(struct xdr_stream *xdr, struct nfs4_server_caps_re
                 goto xdr_error;
         if ((status = decode_attr_aclsupport(xdr, bitmap, &res->acl_bitmask)) != 0)
                 goto xdr_error;
+        if ((status = decode_attr_exclcreat_supported(xdr, bitmap,
+                                res->exclcreat_bitmask)) != 0)
+                goto xdr_error;
         status = verify_attr_len(xdr, savep, attrlen);
 xdr_error:
         dprintk("%s: xdr returned %d!\n", __func__, -status);