<s>
EROFS	B-Application
(	O
Enhanced	B-Application
Read-Only	I-Application
File	I-Application
System	I-Application
)	O
is	O
a	O
lightweight	O
read-only	O
file	B-Application
system	I-Application
initially	O
developed	O
by	O
Huawei	O
for	O
the	O
Linux	B-Operating_System
kernel	I-Operating_System
.	O
</s>
<s>
EROFS	B-Application
aims	O
to	O
form	O
a	O
generic	O
read-only	O
filesystem	B-Application
solution	O
for	O
various	O
read-only	O
use	O
cases	O
(	O
embedded	O
devices	O
,	O
containers	O
and	O
more	O
)	O
instead	O
of	O
just	O
focusing	O
on	O
storage	O
space	O
saving	O
without	O
considering	O
any	O
side	O
effects	O
of	O
runtime	O
performance	O
.	O
</s>
<s>
smartphones	O
like	O
Android	B-Application
and	O
HarmonyOS	B-Operating_System
.	O
</s>
<s>
All	O
of	O
Huawei	O
's	O
new	O
products	O
shipped	O
with	O
EMUI	B-Operating_System
9.0.1	O
or	O
later	O
used	O
EROFS	B-Application
,	O
and	O
it	O
was	O
promoted	O
as	O
one	O
of	O
the	O
key	O
features	O
of	O
EMUI	B-Operating_System
9.1	O
.	O
</s>
<s>
OPPO	O
and	O
Xiaomi	O
products	O
also	O
use	O
EROFS	B-Application
.	O
</s>
<s>
Also	O
,	O
it	O
provides	O
a	O
content-addressable	O
chunk-based	O
container	O
image	O
solution	O
together	O
with	O
lazy	O
pulling	O
feature	O
to	O
accelerate	O
container	O
startup	O
speed	O
by	O
using	O
new	O
file-based	O
fscache	O
backend	O
since	O
Linux	B-Operating_System
kernel	I-Operating_System
v5.19	O
.	O
</s>
<s>
The	O
file	B-Application
system	I-Application
was	O
formally	O
merged	O
into	O
the	O
mainline	B-Application
kernel	I-Application
with	O
Linux	B-Operating_System
kernel	I-Operating_System
v5.4	O
.	O
</s>
<s>
The	O
file	B-Application
system	I-Application
has	O
two	O
different	O
inode	B-Application
on-disk	O
layouts	O
.	O
</s>
<s>
4KB	O
block	O
size	O
and	O
32-bit	O
block	O
address	O
,	O
which	O
limits	O
the	O
total	O
possible	O
capacity	O
of	O
an	O
EROFS	B-Application
filesystem	B-Application
to	O
16	O
TB	O
.	O
</s>
<s>
Big	O
pcluster	O
feature	O
allowing	O
up	O
to	O
1	O
MiB	O
big	O
pclusters	O
for	O
better	O
compression	O
ratios	O
since	O
Linux	B-Operating_System
5.13	O
.	O
</s>
<s>
Direct	O
I/O	O
,	O
Direct	O
Access	O
(	O
DAX	O
)	O
support	O
,	O
chunk-based	O
data	O
de-duplication	O
for	O
uncompressed	O
files	O
since	O
Linux	B-Operating_System
5.15	O
.	O
</s>
<s>
Multiple	O
device	O
support	O
for	O
multiple	O
layer	O
container	O
images	O
since	O
Linux	B-Operating_System
5.16	O
.	O
</s>
<s>
MicroLZMA	O
algorithm	O
support	O
since	O
Linux	B-Operating_System
5.16	O
.	O
</s>
<s>
Ztailpacking	O
support	O
since	O
Linux	B-Operating_System
5.17	O
.	O
</s>
<s>
File-based	O
Fscache	O
backend	O
support	O
since	O
Linux	B-Operating_System
5.19	O
with	O
"	O
on-demand	O
mode	O
"	O
.	O
</s>
