[parted-devel] [PATCH] Initial btrfs support, only recognize it for now

[Luca Bruno]

    Initial btrfs support, only recognize it for now
    
    Add initial btrfs support to libparted; just discovering
    the declared magic entry at the right place to recognize
    filesystem type, for the moment.
    
    Signed-off-by: Luca Bruno <lucab at debian.org>
---
 configure.ac                   |    1 +
 libparted/fs/Makefile.am       |    5 +-
 libparted/fs/btrfs/Makefile.am |    8 +++
 libparted/fs/btrfs/btrfs.c     |  102 ++++++++++++++++++++++++++++++++++++++++
 libparted/libparted.c          |    4 ++
 5 files changed, 118 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 65ddedc..26ce84a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -524,6 +524,7 @@ libparted/Makefile
 libparted/labels/Makefile
 libparted/fs/Makefile
 libparted/fs/amiga/Makefile
+libparted/fs/btrfs/Makefile
 libparted/fs/ext2/Makefile
 libparted/fs/fat/Makefile
 libparted/fs/hfs/Makefile
diff --git a/libparted/fs/Makefile.am b/libparted/fs/Makefile.am
index 96a5744..365ba7b 100644
--- a/libparted/fs/Makefile.am
+++ b/libparted/fs/Makefile.am
@@ -3,7 +3,7 @@
 #
 # This file may be modified and/or distributed without restriction.
 
-SUBDIRS       = amiga ext2 ufs fat ntfs hfs linux_swap xfs jfs reiserfs # bfs
+SUBDIRS       = amiga ext2 ufs fat ntfs hfs linux_swap xfs jfs reiserfs btrfs # bfs
 
 partedincludedir      =	-I$(top_srcdir)/include
 noinst_LTLIBRARIES    =	libfs.la
@@ -23,7 +23,8 @@ libfs_la_LIBADD   = $(UUID_LIBS)		\
 		    linux_swap/liblinuxswap.la	\
 		    xfs/libxfs.la		\
 		    jfs/libjfs.la		\
-		    reiserfs/libreiserfs.la
+		    reiserfs/libreiserfs.la	\
+		    btrfs/libbtrfs.la
 #		    bfs/libbfs.la
 
 libfs_la_SOURCES   =
diff --git a/libparted/fs/btrfs/Makefile.am b/libparted/fs/btrfs/Makefile.am
new file mode 100644
index 0000000..a9428da
--- /dev/null
+++ b/libparted/fs/btrfs/Makefile.am
@@ -0,0 +1,8 @@
+partedincludedir	= -I$(top_srcdir)/include
+
+noinst_LTLIBRARIES	= libbtrfs.la
+libbtrfs_la_SOURCES	= btrfs.c
+
+INCLUDES = $(partedincludedir) $(INTLINCS)
+
+MAINTAINERCLEANFILES = Makefile.in
diff --git a/libparted/fs/btrfs/btrfs.c b/libparted/fs/btrfs/btrfs.c
new file mode 100644
index 0000000..7af101f
--- /dev/null
+++ b/libparted/fs/btrfs/btrfs.c
@@ -0,0 +1,102 @@
+/*
+    libparted - a library for manipulating disk partitions
+    Copyright (C) 2000, 2009 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 published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <config.h>
+
+#include <parted/parted.h>
+#include <parted/endian.h>
+
+#if ENABLE_NLS
+#  include <libintl.h>
+#  define _(String) dgettext (PACKAGE, String)
+#else
+#  define _(String) (String)
+#endif /* ENABLE_NLS */
+
+#include <unistd.h>
+
+#define BTRFS_BLOCK_SIZES       ((int[2]){1024, 0})
+#define BTRFS_SUPER_INFO_SIZE 4096
+#define BTRFS_SUPER_INFO_OFFSET (64 * 1024)
+
+//Should be definitive, as of v0.18
+#define BTRFS_SIGNATURE	"_BHRfS_M"
+
+static PedGeometry*
+btrfs_probe (PedGeometry* geom)
+{
+	char	buf[BTRFS_SUPER_INFO_SIZE];
+
+	if (!ped_geometry_read (geom, buf, (BTRFS_SUPER_INFO_OFFSET / 512), (BTRFS_SUPER_INFO_SIZE / 512)))
+		return 0;
+
+	if (strncmp (BTRFS_SIGNATURE, buf + 64, strlen (BTRFS_SIGNATURE)) == 0)
+		return ped_geometry_new (geom->dev, geom->start, geom->length);
+	else
+		return NULL;
+}
+
+#ifndef DISCOVER_ONLY
+static int
+btrfs_clobber (PedGeometry* geom)
+{
+	char	buf[BTRFS_SUPER_INFO_SIZE];
+
+	memset (buf, 0, BTRFS_SUPER_INFO_SIZE);
+	return ped_geometry_write (geom, buf, (BTRFS_SUPER_INFO_OFFSET / 512), (BTRFS_SUPER_INFO_SIZE / 512));
+}
+#endif /* !DISCOVER_ONLY */
+
+static PedFileSystemOps btrfs_ops = {
+	probe:		btrfs_probe,
+#ifndef DISCOVER_ONLY
+	clobber:	btrfs_clobber,
+#else
+	clobber:	NULL,
+#endif 
+	open:		NULL,
+	create:		NULL,
+	close:		NULL,
+	check:		NULL,
+	copy:		NULL,
+	resize:		NULL,
+	get_create_constraint:	NULL,
+	get_resize_constraint:	NULL,
+	get_copy_constraint:	NULL
+};
+
+static PedFileSystemType btrfs_type = {
+	next:	NULL,
+	ops:	&btrfs_ops,
+	name:	"btrfs",
+	block_sizes: BTRFS_BLOCK_SIZES
+};
+
+void
+ped_file_system_btrfs_init ()
+{
+	ped_file_system_type_register (&btrfs_type);
+}
+
+void
+ped_file_system_btrfs_done ()
+{
+	ped_file_system_type_unregister (&btrfs_type);
+}
+
+
diff --git a/libparted/libparted.c b/libparted/libparted.c
index 023153d..6384598 100644
--- a/libparted/libparted.c
+++ b/libparted/libparted.c
@@ -109,6 +109,7 @@ extern void ped_file_system_jfs_init (void);
 extern void ped_file_system_hfs_init (void);
 extern void ped_file_system_fat_init (void);
 extern void ped_file_system_ext2_init (void);
+extern void ped_file_system_btrfs_init (void);
 
 static void
 init_file_system_types ()
@@ -123,6 +124,7 @@ init_file_system_types ()
 	ped_file_system_hfs_init ();
 	ped_file_system_fat_init ();
 	ped_file_system_ext2_init ();
+	ped_file_system_btrfs_init ();
 }
 #endif /* ENABLE_FS */
 
@@ -188,6 +190,7 @@ extern void ped_file_system_ntfs_done (void);
 extern void ped_file_system_reiserfs_done (void);
 extern void ped_file_system_ufs_done (void);
 extern void ped_file_system_xfs_done (void);
+extern void ped_file_system_btrfs_done (void);
 extern void ped_file_system_amiga_done (void);
 
 static void
@@ -202,6 +205,7 @@ done_file_system_types ()
 	ped_file_system_reiserfs_done ();
 	ped_file_system_ufs_done ();
 	ped_file_system_xfs_done ();
+	ped_file_system_btrfs_done ();
 	ped_file_system_amiga_done ();
 }
 #endif /* ENABLE_FS */