[hurd] 61/70: libnetfs: add fsys_get_source

[Samuel Thibault]

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commit 3a5bcbcc94f01b1ef1ed0571b31434ed57162224
Author: Justus Winter <address@hidden>
Date:   Tue Jul 30 11:59:20 2013 +0200

    libnetfs: add fsys_get_source
    
    Add a user overridable function netfs_get_source with a default
    implementation returning EOPNOTSUPP. Add a server function for
    fsys-get-source.
    
    * libnetfs/Makefile: Add fsys-get-source.c and get-source.c
    * libnetfs/netfs.h: Add netfs_get_source.
    * libnetfs/fsys-get-source.c: New file.
    * libnetfs/get-source.c: Likewise.
---
 libnetfs/Makefile          |    5 +++--
 libnetfs/fsys-get-source.c |   34 ++++++++++++++++++++++++++++++++++
 libnetfs/get-source.c      |   28 ++++++++++++++++++++++++++++
 libnetfs/netfs.h           |    8 +++++++-
 4 files changed, 72 insertions(+), 3 deletions(-)

diff --git a/libnetfs/Makefile b/libnetfs/Makefile
index f456740..1a71b49 100644
--- a/libnetfs/Makefile
+++ b/libnetfs/Makefile
@@ -34,7 +34,8 @@ FSSRCS= dir-link.c dir-lookup.c dir-mkdir.c dir-mkfile.c \
        file-get-translator.c file-getcontrol.c file-getlinknode.c \
        file-lock-stat.c file-lock.c file-set-size.c \
        file-set-translator.c file-statfs.c file-sync.c file-syncfs.c \
-       file-utimes.c file-reparent.c fsstubs.c file-get-transcntl.c
+       file-utimes.c file-reparent.c fsstubs.c file-get-transcntl.c \
+       get-source.c
 
 IOSRCS=        io-read.c io-readable.c io-seek.c io-write.c io-stat.c 
io-async.c     \
        io-set-all-openmodes.c io-get-openmodes.c io-set-some-openmodes.c     \
@@ -44,7 +45,7 @@ IOSRCS=       io-read.c io-readable.c io-seek.c io-write.c 
io-stat.c io-async.c     \
        io-version.c
 
 FSYSSRCS= fsys-syncfs.c fsys-getroot.c fsys-get-options.c fsys-set-options.c \
-       fsys-goaway.c fsysstubs.c fsys-get-children.c
+       fsys-goaway.c fsysstubs.c fsys-get-children.c fsys-get-source.c
 
 IFSOCKSRCS=
 OTHERSRCS= drop-node.c init-init.c make-node.c make-peropen.c make-protid.c   \
diff --git a/libnetfs/fsys-get-source.c b/libnetfs/fsys-get-source.c
new file mode 100644
index 0000000..6143d10
--- /dev/null
+++ b/libnetfs/fsys-get-source.c
@@ -0,0 +1,34 @@
+/* fsys_get_source
+
+   Copyright (C) 2013 Free Software Foundation, Inc.
+
+   Written by Justus Winter <address@hidden>
+
+   This file is part of the GNU Hurd.
+
+   The GNU Hurd is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   The GNU Hurd is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with the GNU Hurd.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include "priv.h"
+#include "fsys_S.h"
+
+/* Return information about the source of the receiving
+   filesystem.  */
+error_t
+netfs_S_fsys_get_source (fsys_t server,
+                        mach_port_t reply,
+                        mach_msg_type_name_t replyPoly,
+                        char *source)
+{
+  return netfs_get_source (source);
+}
diff --git a/libnetfs/get-source.c b/libnetfs/get-source.c
new file mode 100644
index 0000000..71a9639
--- /dev/null
+++ b/libnetfs/get-source.c
@@ -0,0 +1,28 @@
+/* Default version of netfs_get_source
+
+   Copyright (C) 2013 Free Software Foundation, Inc.
+
+   Written by Justus Winter <address@hidden>
+
+   This file is part of the GNU Hurd.
+
+   The GNU Hurd is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   The GNU Hurd is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with the GNU Hurd.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include "priv.h"
+
+error_t
+netfs_get_source (char *source)
+{
+  return EOPNOTSUPP;
+}
diff --git a/libnetfs/netfs.h b/libnetfs/netfs.h
index 2b9454a..e10ccae 100644
--- a/libnetfs/netfs.h
+++ b/libnetfs/netfs.h
@@ -1,6 +1,6 @@
 /*
 
-   Copyright (C) 1994,95,96,97,99,2000,02 Free Software Foundation, Inc.
+   Copyright (C) 1994,95,96,97,99,2000,02,13 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
@@ -313,6 +313,12 @@ error_t netfs_file_get_storage_info (struct iouser *cred,
                                     mach_msg_type_number_t *num_offsets,
                                     char **data,
                                     mach_msg_type_number_t *data_len);
+
+/* The user may define this function.  The function must set source to
+   the source device of the filesystem. The function may return an
+   EOPNOTSUPP to indicate that the concept of a source device is not
+   applicable. The default function always returns EOPNOTSUPP. */
+error_t netfs_get_source (char *source);
 
 /* Option parsing */
 

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