bonefish+stippi:

Implemented the needed fs API hooks to support identifying partitions 
(so ReiserFS partitions appear in the Tracker Mount menu now).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26211 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/kernel/file_systems/reiserfs/Volume.cpp

@@ -86,6 +86,19 @@ Volume::~Volume()
 	Unmount();
 }
 
+// Identify
+status_t
+Volume::Identify(int fd, partition_data *partition)
+{
+	// open disk
+	fDevice = dup(fd);
+	if (fDevice < 0)
+		return B_ERROR;
+
+	// read and analyze super block
+	return _ReadSuperBlock();
+}
+
 // Mount
 status_t
 Volume::Mount(fs_volume *fsVolume, const char *path)

src/add-ons/kernel/file_systems/reiserfs/Volume.h

@@ -41,6 +41,8 @@ public:
 	Volume();
 	~Volume();
 
+	status_t Identify(int fd, partition_data *partition);
+
 	status_t Mount(fs_volume *fsVolume, const char *path);
 	status_t Unmount();
 

src/add-ons/kernel/file_systems/reiserfs/kernel_interface.cpp

@@ -44,6 +44,8 @@
 #include "Volume.h"
 
 
+using std::nothrow;
+
 static const size_t kOptimalIOSize = 65536;
 
 extern fs_volume_ops gReiserFSVolumeOps;
@@ -56,6 +58,57 @@ inline static bool is_user_in_group(gid_t gid);
 // #pragma mark - FS
 
 
+// reiserfs_identify_partition
+static float
+reiserfs_identify_partition(int fd, partition_data *partition, void **cookie)
+{
+	Volume* volume = new(nothrow) Volume();
+	if (volume == NULL)
+		return -1.0;
+
+	status_t status = volume->Identify(fd, partition);
+	if (status != B_OK) {
+		delete volume;
+		return -1.0;
+	}
+
+	*cookie = (void*)volume;
+	return 0.8;
+}
+
+
+// reiserfs_scan_partition
+static status_t
+reiserfs_scan_partition(int fd, partition_data *partition, void *_cookie)
+{
+	Volume* volume = (Volume*)_cookie;
+
+	partition->status = B_PARTITION_VALID;
+	partition->flags |= B_PARTITION_FILE_SYSTEM;
+	partition->content_size = volume->CountBlocks()
+		* volume->GetBlockSize();
+	partition->block_size = volume->GetBlockSize();
+	// TODO: Construct name from partition layout?
+	partition->content_name = strdup("Untitled ReiserFS");
+	if (partition->content_name == NULL)
+		return B_NO_MEMORY;
+
+	return B_OK;
+}
+
+
+// reiserfs_free_identify_partition_cookie
+static void
+reiserfs_free_identify_partition_cookie(partition_data* partition,
+	void* _cookie)
+{
+	delete (Volume*)_cookie;
+}
+
+
+//	#pragma mark -
+
+
 // reiserfs_mount
 static status_t
 reiserfs_mount(fs_volume *_volume, const char *device, uint32 flags,
@@ -663,9 +716,9 @@ static file_system_module_info sReiserFSModuleInfo = {
 
 
 	// scanning
-	NULL,	// identify_partition()
-	NULL,	// scan_partition()
-	NULL,	// free_identify_partition_cookie()
+	&reiserfs_identify_partition,
+	&reiserfs_scan_partition,
+	&reiserfs_free_identify_partition_cookie,
 	NULL,	// free_partition_content_cookie()
 
 	&reiserfs_mount