NFS: use secinfo when crossing mountpoints

index dc5ee60..57bb31a 100644
@@ -254,7 +254,9 @@ nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
 	struct inode *inode = ERR_PTR(-ENOENT);
 	unsigned long hash;
 
-	if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
+	nfs_attr_check_mountpoint(sb, fattr);
+
+	if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0 && (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0)
 		goto out_no_inode;
 	if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
 		goto out_no_inode;

@@ -298,8 +300,8 @@ nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
 			if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS))
 				set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags);
 			/* Deal with crossing mountpoints */
-			if ((fattr->valid & NFS_ATTR_FATTR_FSID)
-					&& !nfs_fsid_equal(&NFS_SB(sb)->fsid, &fattr->fsid)) {
+			if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
+					fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
 				if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
 					inode->i_op = &nfs_referral_inode_operations;
 				else

index 86e717b..ce118ce 100644
@@ -39,6 +39,12 @@ static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
 	return 0;
 }
 
+static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
+{
+	if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
+		fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
+}
+
 struct nfs_clone_mount {
 	const struct super_block *sb;
 	const struct dentry *dentry;

@@ -214,6 +220,7 @@ extern const u32 nfs41_maxwrite_overhead;
 /* nfs4proc.c */
 #ifdef CONFIG_NFS_V4
 extern struct rpc_procinfo nfs4_procedures[];
+void nfs_fixup_secinfo_attributes(struct nfs_fattr *, struct nfs_fh *);
 #endif
 
 extern int nfs4_init_ds_session(struct nfs_client *clp);

165 lines not on this page · raw message

index 464ea88..d6cba3f 100644
@@ -87,6 +87,8 @@ static int nfs4_map_errors(int err)
 	switch (err) {
 	case -NFS4ERR_RESOURCE:
 		return -EREMOTEIO;
+	case -NFS4ERR_WRONGSEC:
+		return -EPERM;
 	case -NFS4ERR_BADOWNER:
 	case -NFS4ERR_BADNAME:
 		return -EINVAL;

@@ -2383,6 +2385,16 @@ static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
 	return status;
 }
 
+void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr, struct nfs_fh *fh)
+{
+	memset(fh, 0, sizeof(struct nfs_fh));
+	fattr->fsid.major = 1;
+	fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
+		NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_FSID | NFS_ATTR_FATTR_MOUNTPOINT;
+	fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
+	fattr->nlink = 2;
+}
+
 static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
 			    struct nfs_fh *fhandle, struct nfs_fattr *fattr)
 {

@@ -2392,6 +2404,8 @@ static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qst
 		err = nfs4_handle_exception(NFS_SERVER(dir),
 				_nfs4_proc_lookup(clnt, dir, name, fhandle, fattr),
 				&exception);
+		if (err == -EPERM)
+			nfs_fixup_secinfo_attributes(fattr, fhandle);
 	} while (exception.retry);
 	return err;
 }

index 12b5dfa..cc4d34d 100644
@@ -113,7 +113,7 @@ static int nfs4_stat_to_errno(int);
 #define encode_restorefh_maxsz  (op_encode_hdr_maxsz)
 #define decode_restorefh_maxsz  (op_decode_hdr_maxsz)
 #define encode_fsinfo_maxsz	(encode_getattr_maxsz)
-#define decode_fsinfo_maxsz	(op_decode_hdr_maxsz + 11)
+#define decode_fsinfo_maxsz	(op_decode_hdr_maxsz + 15)
 #define encode_renew_maxsz	(op_encode_hdr_maxsz + 3)
 #define decode_renew_maxsz	(op_decode_hdr_maxsz)
 #define encode_setclientid_maxsz \

@@ -3038,6 +3038,7 @@ static int decode_attr_error(struct xdr_stream *xdr, uint32_t *bitmap)
 		if (unlikely(!p))
 			goto out_overflow;
 		bitmap[0] &= ~FATTR4_WORD0_RDATTR_ERROR;
+		return -be32_to_cpup(p);
 	}
 	return 0;
 out_overflow:

@@ -4025,6 +4026,10 @@ static int decode_getfattr_attrs(struct xdr_stream *xdr, uint32_t *bitmap,
 	fattr->valid |= status;
 
 	status = decode_attr_error(xdr, bitmap);
+	if (status == -NFS4ERR_WRONGSEC) {
+		nfs_fixup_secinfo_attributes(fattr, fh);
+		status = 0;
+	}
 	if (status < 0)
 		goto xdr_error;
 

@@ -6444,10 +6449,6 @@ static struct {
 	{ NFS4ERR_SYMLINK,	-ELOOP		},
 	{ NFS4ERR_OP_ILLEGAL,	-EOPNOTSUPP	},
 	{ NFS4ERR_DEADLOCK,	-EDEADLK	},
-	{ NFS4ERR_WRONGSEC,	-EPERM		}, /* FIXME: this needs
-						    * to be handled by a
-						    * middle-layer.
-						    */
 	{ -1,			-EIO		}
 };
 

index ac8a74d..727a810 100644
@@ -82,6 +82,7 @@ struct nfs_fattr {
 #define NFS_ATTR_FATTR_CHANGE		(1U << 17)
 #define NFS_ATTR_FATTR_PRECHANGE	(1U << 18)
 #define NFS_ATTR_FATTR_V4_REFERRAL	(1U << 19)	/* NFSv4 referral */
+#define NFS_ATTR_FATTR_MOUNTPOINT	(1U << 20)	/* Treat as mountpoint */
 
 #define NFS_ATTR_FATTR (NFS_ATTR_FATTR_TYPE \
 		| NFS_ATTR_FATTR_MODE \

index 8b40610..6c844b0 100644
@@ -160,6 +160,28 @@ gss_mech_get_by_name(const char *name)
 
 EXPORT_SYMBOL_GPL(gss_mech_get_by_name);
 
+struct gss_api_mech *
+gss_mech_get_by_OID(struct xdr_netobj *obj)
+{
+	struct gss_api_mech	*pos, *gm = NULL;
+
+	spin_lock(&registered_mechs_lock);
+	list_for_each_entry(pos, &registered_mechs, gm_list) {
+		if (obj->len == pos->gm_oid.len) {
+			if (0 == memcmp(obj->data, pos->gm_oid.data, obj->len)) {
+				if (try_module_get(pos->gm_owner))
+					gm = pos;
+				break;
+			}
+		}
+	}
+	spin_unlock(&registered_mechs_lock);
+	return gm;
+
+}
+
+EXPORT_SYMBOL_GPL(gss_mech_get_by_OID);
+
 static inline int
 mech_supports_pseudoflavor(struct gss_api_mech *gm, u32 pseudoflavor)
 {