<s>
Squashfs	B-Application
is	O
a	O
compressed	B-General_Concept
read-only	O
file	B-Application
system	I-Application
for	O
Linux	B-Application
.	O
</s>
<s>
Squashfs	B-Application
compresses	O
files	B-Operating_System
,	O
inodes	B-Application
and	O
directories	B-Application
,	O
and	O
supports	O
block	B-General_Concept
sizes	I-General_Concept
from	O
4	O
KiB	O
up	O
to	O
1	O
MiB	O
for	O
greater	O
compression	O
.	O
</s>
<s>
Several	O
compression	B-General_Concept
algorithms	I-General_Concept
are	O
supported	O
.	O
</s>
<s>
Squashfs	B-Application
is	O
also	O
the	O
name	O
of	O
free	B-Application
software	I-Application
,	O
licensed	O
under	O
the	O
GPL	B-License
,	O
for	O
accessing	O
Squashfs	B-Application
filesystems	B-Application
.	O
</s>
<s>
Squashfs	B-Application
is	O
intended	O
for	O
general	O
read-only	O
file-system	B-Application
use	O
and	O
in	O
constrained	O
block-device	O
memory	O
systems	O
(	O
e.g.	O
</s>
<s>
embedded	B-Architecture
systems	I-Architecture
)	O
where	O
low	O
overhead	O
is	O
needed	O
.	O
</s>
<s>
Squashfs	B-Application
is	O
used	O
by	O
the	O
Live	O
CD	O
versions	O
of	O
Arch	O
Linux	B-Application
,	O
Debian	O
,	O
Fedora	O
,	O
Gentoo	B-Application
Linux	I-Application
,	O
Linux	B-Application
Mint	I-Application
,	O
openSUSE	B-Operating_System
,	O
Salix	O
,	O
Ubuntu	B-Operating_System
,	O
NixOS	O
,	O
Clonezilla	B-Language
,	O
Kali	O
Linux	B-Application
and	O
on	O
embedded	O
distributions	O
such	O
as	O
the	O
OpenWrt	B-Application
and	O
DD-WRT	B-Protocol
router	B-Protocol
firmware	B-Application
.	O
</s>
<s>
It	O
is	O
also	O
used	O
in	O
Chromecast	B-Device
and	O
for	O
the	O
system	O
partitions	O
of	O
some	O
Android	B-Application
releases	O
(	O
Android	B-Application
Nougat	I-Application
)	O
.	O
</s>
<s>
It	O
is	O
often	O
combined	O
with	O
a	O
union	B-Application
mount	I-Application
filesystem	B-Application
,	O
such	O
as	O
UnionFS	B-Application
,	O
OverlayFS	B-Application
,	O
or	O
aufs	B-Application
,	O
to	O
provide	O
a	O
read-write	O
environment	O
for	O
live	O
Linux	B-Application
distributions	O
.	O
</s>
<s>
This	O
takes	O
advantage	O
of	O
both	O
Squashfs	B-Application
's	O
high-speed	O
compression	O
abilities	O
and	O
the	O
ability	O
to	O
alter	O
the	O
distribution	O
while	O
running	O
it	O
from	O
a	O
live	O
CD	O
.	O
</s>
<s>
Distributions	O
such	O
as	O
Debian	O
Live	O
,	O
Mandriva	O
One	O
,	O
Puppy	O
Linux	B-Application
,	O
Salix	O
Live	O
and	O
Slax	O
use	O
this	O
combination	O
.	O
</s>
<s>
The	O
AppImage	B-Application
project	O
,	O
which	O
aims	O
to	O
create	O
portable	O
linux	B-Application
applications	O
,	O
uses	O
squashfs	B-Application
for	O
creating	O
appimages	B-Application
.	O
</s>
<s>
The	O
Snappy	B-Application
package	O
manager	O
also	O
uses	O
squashfs	B-Application
for	O
its	O
"	O
.snap	B-Application
file	O
format	O
"	O
.	O
</s>
<s>
Squashfs	B-Application
is	O
also	O
used	O
by	O
Linux	B-Application
Terminal	I-Application
Server	I-Application
Project	I-Application
and	O
Splashtop	B-Device
.	O
</s>
<s>
The	O
tools	O
unsquashfs	O
and	O
mksquashfs	B-Application
have	O
been	O
ported	O
to	O
Windows	B-Device
NT	I-Device
–	O
Windows	B-Device
8.1	I-Device
.	O
</s>
<s>
7-Zip	B-Language
also	O
supports	O
Squashfs	B-Application
.	O
</s>
<s>
Squashfs	B-Application
was	O
initially	O
maintained	O
as	O
an	O
out-of-tree	O
Linux	B-Application
patch	O
.	O
</s>
<s>
In	O
2009	O
Squashfs	B-Application
was	O
merged	O
into	O
Linux	B-Application
mainline	O
as	O
part	O
of	O
Linux	B-Application
2.6.29	O
.	O
</s>
<s>
In	O
that	O
process	O
,	O
the	O
backward-compatibility	B-General_Concept
code	O
for	O
older	O
formats	O
was	O
removed	O
.	O
</s>
<s>
Since	O
then	O
the	O
Squashfs	B-Application
kernel-space	B-Operating_System
code	O
has	O
been	O
maintained	O
in	O
the	O
Linux	B-Application
mainline	O
tree	O
,	O
while	O
the	O
user-space	B-Operating_System
tools	O
remain	O
on	O
the	O
project	O
's	O
GitHub	B-Application
page	O
.	O
</s>
<s>
The	O
original	O
version	O
of	O
Squashfs	B-Application
used	O
gzip	B-Application
compression	I-Application
,	O
although	O
Linux	B-Application
kernel	O
2.6.34	O
added	O
support	O
for	O
LZMA	B-General_Concept
and	O
LZO	B-Language
compression	O
,	O
Linux	B-Application
kernel	O
2.6.38	O
added	O
support	O
for	O
LZMA2	O
compression	O
(	O
which	O
is	O
used	O
by	O
xz	B-Language
)	O
,	O
Linux	B-Application
kernel	O
3.19	O
added	O
support	O
for	O
LZ4	B-Language
compression	O
,	O
and	O
Linux	B-Application
kernel	O
4.14	O
added	O
support	O
for	O
Zstandard	B-Language
compression	O
.	O
</s>
<s>
Linux	B-Application
kernel	O
2.6.35	O
added	O
support	O
for	O
extended	B-Application
file	I-Application
attributes	I-Application
.	O
</s>
