* support for setting volume label (bug #7100).

* minor cleanup


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@40243 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/kernel/file_systems/ext2/ExtentStream.cpp

@@ -83,7 +83,7 @@ ExtentStream::FindBlock(off_t offset, fsblock_t& block, uint32 *_count)
 		int32 high = stream->extent_header.NumEntries() - 1;
 		int32 middle = 0;
 		while (low <= high) {
-			middle = (high + low) / 2;
+			middle = (high + low) >> 1;
 			if (stream->extent_entries[middle].LogicalBlock() == index)
 				break;
 			if (stream->extent_entries[middle].LogicalBlock() < index)

src/add-ons/kernel/file_systems/ext2/Volume.cpp

@@ -266,6 +266,13 @@ Volume::Name() const
 }
 
 
+void
+Volume::SetName(const char* name)
+{
+	strlcpy(fSuperBlock.name, name, sizeof(fSuperBlock.name));
+}
+
+
 status_t
 Volume::Mount(const char* deviceName, uint32 flags)
 {

src/add-ons/kernel/file_systems/ext2/Volume.h

@@ -34,7 +34,7 @@ public:
 			bool				IsValidSuperBlock();
 			bool				IsReadOnly() const
 									{ return (fFlags & VOLUME_READ_ONLY) != 0; }
-
+			mutex&				Lock();
 			bool				HasExtendedAttributes() const;
 
 			Inode*				RootNode() const { return fRootNode; }
@@ -44,6 +44,7 @@ public:
 									{ return fFSVolume ? fFSVolume->id : -1; }
 			fs_volume*			FSVolume() const { return fFSVolume; }
 			const char*			Name() const;
+			void				SetName(const char* name);
 
 			uint32				NumInodes() const
 									{ return fNumInodes; }
@@ -174,4 +175,11 @@ private:
 			Inode*				fRootNode;
 };
 
+
+inline mutex&
+Volume::Lock()
+{
+	 return fLock;
+}
+
 #endif	// VOLUME_H

src/add-ons/kernel/file_systems/ext2/kernel_interface.cpp

@@ -177,6 +177,28 @@ ext2_read_fs_info(fs_volume* _volume, struct fs_info* info)
 }
 
 
+static status_t
+ext2_write_fs_info(fs_volume* _volume, const struct fs_info* info, uint32 mask)
+{
+	Volume* volume = (Volume*)_volume->private_volume;
+
+	if (volume->IsReadOnly())
+		return B_READ_ONLY_DEVICE;
+
+	MutexLocker locker(volume->Lock());
+
+	status_t status = B_BAD_VALUE;
+
+	if (mask & FS_WRITE_FSINFO_NAME) {
+		Transaction transaction(volume->GetJournal());
+		volume->SetName(info->volume_name);
+		status = volume->WriteSuperBlock(transaction);
+		transaction.Done();
+	}
+	return status;
+}
+
+
 static status_t
 ext2_sync(fs_volume* _volume)
 {
@@ -1629,7 +1651,7 @@ ext2_remove_attr(fs_volume* _volume, fs_vnode* vnode,
 fs_volume_ops gExt2VolumeOps = {
 	&ext2_unmount,
 	&ext2_read_fs_info,
-	NULL,	// write_fs_info()
+	&ext2_write_fs_info,
 	&ext2_sync,
 	&ext2_get_vnode,
 };
@@ -1717,7 +1739,8 @@ static file_system_module_info sExt2FileSystem = {
 
 	"ext2",						// short_name
 	"Ext2 File System",			// pretty_name
-	B_DISK_SYSTEM_SUPPORTS_WRITING,						// DDM flags
+	B_DISK_SYSTEM_SUPPORTS_WRITING
+		| B_DISK_SYSTEM_SUPPORTS_CONTENT_NAME,	// DDM flags
 
 	// scanning
 	ext2_identify_partition,