GVfs is a userspace virtual filesystem implementation for GIO (a library available in GLib). GVfs comes with a set of backends, including trash support, SFTP, SMB, HTTP, DAV, and many others. GVfs also contains modules for GIO that implement volume monitors and persistent metadata storage. There is also FUSE support that provides limited access to the GVfs filesystems for applications not using GIO.
For more info about GVfs, see https://wiki.gnome.org/Projects/gvfs.
Bug reports can be found and filed at https://gitlab.gnome.org/GNOME/gvfs/issues. For security-related issues, please use https://security.gnome.org/.
See https://wiki.gnome.org/Projects/gvfs/debugging for info about getting debug logs.
For questions use GNOME Discourse.