2008-05-22 Hans Petter Jansson <hpj@novell.com>

	Fix fuse daemon locking and file handle life-cycle issues that
	were causing frequent crashes.

	* client/gvfsfusedaemon.c (file_handle_new): Add a "path" field
	pointing to a string representing the path this file handle is
	associated with, for reverse mapping.
	(file_handle_unref): Is now responsible for decrementing the ref
	count and freeing the handle if it reaches 0. Note that we need
	to check the ref count again after obtaining the global mutex.
	(file_handle_free): The new path member is freed here.
	(get_file_handle_for_path): Ref the obtained handle.
	(get_or_create_file_handle_for_path): Ditto, and hold the lock the
	whole time.
	(reindex_file_handle_for_path): Steal the old entry to avoid
	buildup of stale handles.
	(free_file_handle_for_path): Remove.
	(vfs_getattr): Unref the handle when we're done with it.
	(vfs_rename): Ditto.
	(vfs_unlink): Ditto.
	(vfs_truncate): Ditto.
	(vfs_open): Don't ref the obtained handle; it's done in the helper.
	(vfs_create): Ditto.
	(vfs_release): Let file_handle_unref() free the handle if
	appropriate. Note that the old logic here was inverted, meaning we'd
	try to free the handle if the ref count was non-zero.
	(vfs_init): The hash table no longer owns the path key strings -
	the file handle does.


svn path=/trunk/; revision=1783