NFSv4: Define an fs_locations bitmap

This is (similar to getattr bitmap) but includes fs_locations and
mounted_on_fileid attributes. Use this bitmap for encoding in fs_locations
requests.
Note: We can probably do better by requesting locations as part of fsinfo
itself.

Signed-off-by: Manoj Naik <manoj@almaden.ibm.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/nfs4_fs.h

@@ -228,6 +228,7 @@ extern const u32 nfs4_fattr_bitmap[2];
 extern const u32 nfs4_statfs_bitmap[2];
 extern const u32 nfs4_pathconf_bitmap[2];
 extern const u32 nfs4_fsinfo_bitmap[2];
+extern const u32 nfs4_fs_locations_bitmap[2];
 
 /* nfs4renewd.c */
 extern void nfs4_schedule_state_renewal(struct nfs4_client *);

fs/nfs/nfs4proc.c

@@ -121,6 +121,25 @@ const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 			0
 };
 
+const u32 nfs4_fs_locations_bitmap[2] = {
+	FATTR4_WORD0_TYPE
+	| FATTR4_WORD0_CHANGE
+	| FATTR4_WORD0_SIZE
+	| FATTR4_WORD0_FSID
+	| FATTR4_WORD0_FILEID
+	| FATTR4_WORD0_FS_LOCATIONS,
+	FATTR4_WORD1_MODE
+	| FATTR4_WORD1_NUMLINKS
+	| FATTR4_WORD1_OWNER
+	| FATTR4_WORD1_OWNER_GROUP
+	| FATTR4_WORD1_RAWDEV
+	| FATTR4_WORD1_SPACE_USED
+	| FATTR4_WORD1_TIME_ACCESS
+	| FATTR4_WORD1_TIME_METADATA
+	| FATTR4_WORD1_TIME_MODIFY
+	| FATTR4_WORD1_MOUNTED_ON_FILEID
+};
+
 static void nfs4_setup_readdir(u64 cookie, u32 *verifier, struct dentry *dentry,
 		struct nfs4_readdir_arg *readdir)
 {
@@ -3594,6 +3613,7 @@ int nfs4_proc_fs_locations(struct inode *dir, struct dentry *dentry,
 	dprintk("%s: start\n", __FUNCTION__);
 	fs_locations->fattr.valid = 0;
 	fs_locations->server = server;
+	fs_locations->nlocations = 0;
 	status = rpc_call_sync(server->client, &msg, 0);
 	dprintk("%s: returned status = %d\n", __FUNCTION__, status);
 	return status;

fs/nfs/nfs4xdr.c

@@ -731,6 +731,13 @@ static int encode_fsinfo(struct xdr_stream *xdr, const u32* bitmask)
 			bitmask[1] & nfs4_fsinfo_bitmap[1]);
 }
 
+static int encode_fs_locations(struct xdr_stream *xdr, const u32* bitmask)
+{
+	return encode_getattr_two(xdr,
+				  bitmask[0] & nfs4_fs_locations_bitmap[0],
+				  bitmask[1] & nfs4_fs_locations_bitmap[1]);
+}
+
 static int encode_getfh(struct xdr_stream *xdr)
 {
 	uint32_t *p;
@@ -2030,10 +2037,10 @@ static int nfs4_xdr_enc_fs_locations(struct rpc_rqst *req, uint32_t *p, struct n
 		goto out;
 	if ((status = encode_lookup(&xdr, args->name)) != 0)
 		goto out;
-	if ((status = encode_getfattr(&xdr, args->bitmask)) != 0)
+	if ((status = encode_fs_locations(&xdr, args->bitmask)) != 0)
 		goto out;
 	/* set up reply
-	 *   toplevel_status + taglen + rescount + OP_PUTFH + status
+	 *   toplevel_status + OP_PUTFH + status
 	 *   + OP_LOOKUP + status + OP_GETATTR + status = 7
 	 */
 	replen = (RPC_REPHDRSIZE + auth->au_rslack + 7) << 2;