<s>
GVfs	B-Language
(	O
abbreviation	O
for	O
GNOME	B-Application
virtual	I-Application
file	I-Application
system	I-Application
)	O
is	O
GNOME	B-Application
's	O
userspace	O
virtual	B-Application
filesystem	I-Application
designed	O
to	O
work	O
with	O
the	O
I/O	O
abstraction	B-Application
of	O
GIO	B-Language
,	O
a	O
library	O
available	O
in	O
GLib	B-Language
since	O
version	O
2.15.1	O
.	O
</s>
<s>
There	O
is	O
also	O
FUSE	B-Application
support	O
that	O
allows	O
applications	O
not	O
using	O
GIO	B-Language
to	O
access	O
the	O
GVfs	B-Language
filesystems	B-Application
.	O
</s>
<s>
A	O
cause	O
of	O
confusion	O
is	O
the	O
fact	O
that	O
the	O
file	B-Application
system	I-Application
abstraction	B-Application
used	O
by	O
the	O
Linux	B-Operating_System
kernel	I-Operating_System
is	O
also	O
called	O
the	O
virtual	B-Application
file	I-Application
system	I-Application
(	O
VFS	O
)	O
layer	O
.	O
</s>
<s>
The	O
GVfs	B-Language
model	O
differs	O
from	O
e.g.	O
</s>
<s>
GnomeVFS	B-Application
,	O
which	O
it	O
replaces	O
,	O
in	O
that	O
file	B-Application
systems	I-Application
must	O
be	O
mounted	B-Application
before	O
they	O
are	O
used	O
.	O
</s>
<s>
There	O
is	O
a	O
master	O
daemon	B-Operating_System
(	O
gvfsd	O
)	O
that	O
handles	O
coordinating	O
mounts	O
,	O
and	O
then	O
each	O
mount	O
is	O
(	O
typically	O
)	O
in	O
its	O
own	O
daemon	B-Operating_System
process	I-Operating_System
(	O
although	O
mounts	O
can	O
share	O
daemon	B-Operating_System
process	I-Operating_System
)	O
.	O
</s>
<s>
GVfs	B-Language
comes	O
with	O
a	O
set	O
of	O
back-ends	O
,	O
including	O
trash	O
support	O
,	O
SFTP	B-Protocol
,	O
FTP	B-Protocol
,	O
WebDAV	B-Protocol
,	O
SMB	B-Operating_System
,	O
and	O
local	O
data	O
via	O
Udev	B-Application
integration	O
,	O
OBEX	B-General_Concept
,	O
MTP	B-Protocol
and	O
others	O
.	O
</s>
<s>
GVfs	B-Language
does	O
not	O
seem	O
to	O
support	O
the	O
Files	B-Protocol
transferred	I-Protocol
over	I-Protocol
shell	I-Protocol
protocol	I-Protocol
(	O
FISH	O
)	O
.	O
</s>
<s>
GVfs	B-Language
also	O
contains	O
modules	O
for	O
GIO	B-Language
that	O
implement	O
volume	O
monitors	O
and	O
the	O
GNOME	B-Application
URI	B-Protocol
scheme	O
handler	O
configuration	O
.	O
</s>
<s>
There	O
is	O
a	O
set	O
of	O
arguments	O
to	O
the	O
command	O
line	O
program	O
"	O
gio	B-Language
"	O
that	O
lets	O
you	O
run	O
commands	O
(	O
like	O
cat	O
,	O
ls	O
,	O
stat	O
,	O
mount	O
,	O
etc	O
.	O
)	O
</s>
<s>
on	O
files	O
in	O
the	O
GVfs	B-Language
mounts	O
.	O
</s>
<s>
Attached	O
resources	O
are	O
exposed	O
via	O
a	O
URI	B-Protocol
syntax	O
,	O
for	O
example	O
smb://server01/gamedata	O
or	O
ftp://username:password	O
@ftp	O
.example.net/public_html	O
,	O
but	O
are	O
also	O
mounted	B-Application
in	O
the	O
traditional	O
manner	O
under	O
~	O
/.gvfs/	O
or	O
/run/user/	O
$	O
UID/gvfs	O
or	O
$	O
XDG_RUNTIME_DIR/gvfs	O
directory	O
to	O
make	O
them	O
available	O
to	O
applications	O
using	O
standard	O
POSIX	O
commands	O
and	O
I/O	O
.	O
</s>
<s>
Along	O
with	O
generally	O
useful	O
APIs	O
such	O
as	O
networking	O
and	O
D-Bus	B-Language
support	O
,	O
GIO	B-Language
also	O
provides	O
a	O
VFS	O
API	O
to	O
applications	O
.	O
</s>
<s>
GVfs	B-Language
provides	O
implementations	O
that	O
go	O
beyond	O
that	O
and	O
allow	O
to	O
access	O
files	O
and	O
storage	O
using	O
many	O
protocols	O
.	O
</s>
<s>
GVfs	B-Language
provides	O
implementations	O
for	O
various	O
network	B-Protocol
file	I-Protocol
systems	I-Protocol
as	O
loadable	O
modules	O
.	O
</s>
<s>
Additionally	O
GVfs	B-Language
also	O
provides	O
support	O
for	O
trash	O
,	O
network	O
or	O
recent	O
folders	O
,	O
for	O
CD	O
burning	O
and	O
for	O
monitoring	O
interesting	O
devices	O
and	O
volumes	O
on	O
the	O
computer	O
.	O
</s>
<s>
The	O
goal	O
of	O
GVfs	B-Language
has	O
been	O
to	O
overcome	O
the	O
shortcomings	O
of	O
GnomeVFS	B-Application
and	O
provide	O
an	O
API	O
that	O
is	O
so	O
good	O
that	O
developers	O
prefer	O
it	O
over	O
raw	O
POSIX	O
calls	O
.	O
</s>
<s>
Applications	O
use	O
GVfs	B-Language
indirectly	O
,	O
by	O
means	O
of	O
GIO	B-Language
loading	O
the	O
GVfs	B-Language
module	O
that	O
implements	O
the	O
GIO	B-Language
extension	O
points	O
.	O
</s>
<s>
The	O
GVfs	B-Language
main	O
daemon	B-Operating_System
gvfsd	O
spawns	O
further	O
mount	O
daemons	B-Operating_System
for	O
each	O
individual	O
connection	O
.	O
</s>
<s>
The	O
GVfs	B-Language
support	O
for	O
volume	O
monitoring	O
is	O
included	O
in	O
a	O
separate	O
loadable	O
module	O
.	O
</s>
<s>
The	O
actual	O
GVfs	B-Language
implementation	O
is	O
distributed	O
over	O
a	O
number	O
of	O
processes	O
.	O
</s>
<s>
GVfs	B-Language
can	O
use	O
FUSE	B-Application
to	O
mount	O
its	O
VFS	O
directly	O
onto	O
the	O
filesystem	B-Application
.	O
</s>
<s>
GVfs	B-Language
itself	O
,	O
which	O
contains	O
a	O
collection	O
of	O
daemons	B-Operating_System
which	O
communicate	O
with	O
each	O
other	O
and	O
the	O
GIO	B-Language
module	O
over	O
D-Bus	B-Language
.	O
</s>
<s>
A	O
collection	O
of	O
command-line	O
utilities	O
(	O
such	O
as	O
gvfs-mount	O
,	O
gvfs-less	O
)	O
works	O
with	O
VFS	O
resources	O
.	O
</s>
<s>
Daemon	B-Operating_System
task	O
Main	O
gvfsd	O
gvfsd	O
is	O
the	O
main	O
daemon	B-Operating_System
of	O
GVfs	B-Language
.	O
</s>
<s>
It	O
provides	O
the	O
"	O
org.gtk.vfs.Daemon	O
"	O
name	O
on	O
the	O
session	O
bus	O
.	O
</s>
<s>
gvfsd	O
is	O
autostarted	O
by	O
GIO	B-Language
clients	O
if	O
it	O
is	O
not	O
running	O
.	O
</s>
<s>
gvfsd	O
also	O
starts	O
the	O
gvfsd-fuse(1 )	O
,	O
and	O
provides	O
it	O
the	O
mount	O
point	O
where	O
the	O
fuse	B-Application
file	B-Application
system	I-Application
should	O
be	O
mounted	B-Application
.	O
</s>
<s>
gvfsd-fuse	O
gvfsd-fuse	O
maintains	O
a	O
FUSE	B-Application
(	O
Filesystem	B-Application
in	I-Application
Userspace	I-Application
)	O
mount	O
to	O
make	O
GVfs	B-Language
back-ends	O
available	O
to	O
POSIX	O
applications	O
.	O
</s>
<s>
The	O
mount	O
point	O
for	O
the	O
fuse	B-Application
filesystem	B-Application
is	O
provided	O
by	O
the	O
 [ PATH ] 	O
argument	O
.	O
</s>
<s>
gvfsd-fuse	O
is	O
normally	O
started	O
by	O
gvfsd	O
.	O
</s>
<s>
gvfsd-metadata	O
gvfsd-metadata	O
is	O
a	O
daemon	B-Operating_System
acting	O
as	O
a	O
write	O
serialiser	O
to	O
the	O
internal	O
gvfs	B-Language
metadata	O
storage	O
.	O
</s>
<s>
It	O
is	O
autostarted	O
by	O
GIO	B-Language
clients	O
when	O
they	O
make	O
metadata	O
changes	O
.	O
</s>
<s>
Read	O
operations	O
are	O
done	O
by	O
client-side	O
GIO	B-Language
code	O
directly	O
,	O
and	O
do	O
n't	O
require	O
the	O
daemon	B-Operating_System
to	O
be	O
running	O
.	O
</s>
<s>
The	O
gvfs	B-Language
metadata	O
capabilities	O
are	O
used	O
by	O
the	O
GNOME	B-Language
Files	I-Language
file	O
manager	O
,	O
for	O
example	O
.	O
</s>
<s>
Volume	O
monitors	O
gvfs-goa-volume-monitor	O
support	O
for	O
GNOME	B-Application
Online	O
Accounts	O
(	O
cf	O
.	O
</s>
<s>
GNOME	B-Application
Online	O
Accounts	O
in	O
the	O
GNOME	B-Application
wiki	O
)	O
gfvs-gphoto2-volume-monitor	O
support	O
for	O
the	O
Picture	B-Algorithm
Transfer	I-Algorithm
Protocol	I-Algorithm
as	O
implemented	O
in	O
gPhoto	B-Algorithm
gvfs-mtp-volume-monitor	O
support	O
for	O
the	O
Media	B-Protocol
Transfer	I-Protocol
Protocol	I-Protocol
gvfs-udisks2-volume-monitor	O
The	O
gvfs-udisks2-volume-monitor	O
process	O
is	O
responsible	O
for	O
the	O
disks	B-Language
,	O
media	O
,	O
mounts	O
and	O
fstab	B-Protocol
entries	O
shown	O
in	O
the	O
desktop	O
user	O
interface	O
.	O
</s>
<s>
In	O
particular	O
,	O
GNOME	B-Language
Shell	I-Language
,	O
GNOME	B-Language
Files	I-Language
as	O
well	O
as	O
any	O
other	O
application	O
using	O
the	O
GLib	B-Language
APIs	O
,	O
is	O
using	O
information	O
from	O
this	O
process	O
.	O
</s>
<s>
In	O
Debian	O
it	O
is	O
distributed	O
as	O
part	O
of	O
the	O
gvfs-daemons	O
package	O
.	O
</s>
<s>
udisks	B-Application
:	O
The	O
udisks	B-Application
daemon	B-Operating_System
serves	O
as	O
an	O
interface	O
to	O
system	O
block	O
devices	O
,	O
implemented	O
via	O
D-Bus	B-Language
.	O
</s>
<s>
It	O
handles	O
operations	O
such	O
as	O
querying	O
,	O
mounting	B-Application
,	O
unmounting	O
,	O
formatting	O
,	O
or	O
detaching	O
storage	O
devices	O
such	O
as	O
hard	O
disks	B-Language
or	O
USB	O
thumb	O
drives	O
.	O
</s>
<s>
gvfs-afc-volume-monitor	O
support	O
for	O
Apple	O
File	O
Conduit	O
Mount	O
back-ends	O
gvfsd-afc	O
mounts	O
iPhone/iPod	O
touch	O
volumes	O
gvfsd-afp	O
mounts	O
Apple	B-Protocol
Filing	I-Protocol
Protocol	I-Protocol
volumes	O
gvfsd-afp-browse	O
browses	O
Apple	B-Protocol
Filing	I-Protocol
Protocol	I-Protocol
volumes	O
gvfsd-archive	O
mounts	O
archive	O
files	O
in	O
various	O
formats	O
gvfsd-burn	O
provides	O
a	O
location	O
for	O
burning	O
CDs/optical	O
discs	O
gvfsd-cdda	O
mounts	O
audio	O
CDs	O
gvfsd-computer	O
provides	O
computer://	O
gvfsd-dav	O
mounts	O
DAV	O
filesystems	B-Application
gvfsd-dnssd	O
browses	O
DNS-SD	O
gvfsd-ftp	O
mounts	O
over	O
FTP	B-Protocol
gvfsd-gphoto2	O
mounts	O
over	O
PTP	O
,	O
meaning	O
GVfs	B-Language
uses	O
libgphoto2	B-Algorithm
to	O
expose	O
on-camera	O
photos	O
to	O
GNOME	B-Application
applications	O
via	O
the	O
VFS	O
gvfsd-http	O
mounts	O
over	O
HTTP	O
gvfsd-localtest	O
a	O
test	O
backend	O
gvfsd-mtp	O
mounts	O
over	O
MTP	B-Protocol
gvfsd-network	O
provides	O
network://	O
gvfsd-nfs	O
mounts	O
over	O
NFS	B-Protocol
protocol	I-Protocol
gvfsd-recent	O
provides	O
recent://	O
gvfsd-sftp	O
mounts	O
over	O
sftp	B-Protocol
gvfsd-smb	O
mounts	O
SMB	B-Operating_System
(	O
i.e.	O
</s>
<s>
Devices	O
connected	O
over	O
eSATA	O
or	O
USB	O
are	O
(	O
supposed	O
to	O
be	O
)	O
physically	O
hot-pluggable	B-Device
.	O
</s>
<s>
When	O
a	O
device	O
is	O
physically	O
connected	O
to	O
or	O
physically	O
removed	O
from	O
the	O
computer	O
system	O
,	O
the	O
Linux	B-Operating_System
kernel	I-Operating_System
notices	O
and	O
sends	O
out	O
an	O
event	O
to	O
user-space	O
.	O
</s>
<s>
systemd-udevd	B-Application
receives	O
such	O
events	O
and	O
responds	O
to	O
them	O
according	O
to	O
its	O
quite	O
comprehensive	O
configuration	O
:	O
</s>
<s>
in	O
case	O
of	O
a	O
block	O
device	O
systemd-udevd	B-Application
notifies	O
udisksd	O
,	O
and	O
gvfsd	O
and	O
gvfs-udisks2-volume-monitor	O
.	O
</s>
<s>
The	O
udisks2	O
daemon	B-Operating_System
udisksd	O
serves	O
as	O
an	O
interface	O
to	O
system	O
block	O
devices	O
,	O
implemented	O
via	O
D-Bus	B-Language
.	O
</s>
<s>
It	O
handles	O
operations	O
such	O
as	O
querying	O
,	O
mounting	B-Application
,	O
unmounting	O
,	O
formatting	O
,	O
or	O
detaching	O
storage	O
devices	O
such	O
as	O
hard	O
disks	B-Language
or	O
USB	O
thumb	O
drives	O
.	O
</s>
<s>
This	O
package	O
also	O
provides	O
the	O
udisksctl	O
utility	O
,	O
which	O
can	O
be	O
used	O
to	O
trigger	O
these	O
operations	O
from	O
the	O
command	O
line	O
(	O
if	O
permitted	O
by	O
PolicyKit	B-Language
)	O
.	O
</s>
<s>
In	O
Debian	O
the	O
GVfs	B-Language
is	O
packaged	B-Application
into	O
four	O
packages	O
:	O
,	O
,	O
and	O
.	O
</s>
