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From: Saumya Panda <saumya.iisc@gmail.com>
Date: Mon, 20 Jan 2020 12:25:15 +0530
Message-ID: <CAHmfoRm7xUwuXfTZ2kr-x9fs59x7b707t183ggbLEtEyO_wznA@mail.gmail.com>
Subject: Problem in EROFS: Not able to read the files after mount
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Hi Experts,
   I am testing EROFS in openSuse(Kernel: 5.4.7-1-default). I used the
enwik8 and enwik9 as source file (
https://cs.fit.edu/~mmahoney/compression/textdata.html) for compression.
But after I mount the erofs image, I am not able to read it (it is saying
operation not permitted). Simple "ls" command is not working. But if I
create EROFS image without compression flag, then after mount I am able to
read the files. Seems there is some problem during compression.

I will appreciate if someone can help me out why this is happening.

Steps followed:
*Erofs image creation & mount: *
mkfs.erofs -zlz4hc enwik8.erofs.img enwik8/
mkfs.erofs 1.0
        c_version:           [     1.0]
        c_dbg_lvl:           [       0]
        c_dry_run:           [       0]
mount enwik8.erofs.img /mnt/enwik8/ -t erofs -o loop

ls -l /mnt/enwik8/
ls: cannot access '/mnt/enwik8/enwik8': Operation not supported
total 0
-????????? ? ? ? ?            ? enwik8

The problem seen for both lz4 & lz4hc.

*Erofs image creation & mount without compression: *
mkfs.erofs  enwik8_nocomp.erofs.img enwik8/
mkfs.erofs 1.0
        c_version:           [     1.0]
        c_dbg_lvl:           [       0]
        c_dry_run:           [       0]

mount enwik8_nocomp.erofs.img /mnt/enwik8_nocomp/ -t erofs -o loop

ls -l /mnt/enwik8_nocomp/
total 97660
-rw-r--r-- 1 root root 100000000 Jan 20 01:27 enwik8

*Original enwik8 file:*
ls -l enwik8
total 97660
-rw-r--r-- 1 root root 100000000 Jan 20 01:14 enwik8

*Source code used for Lz4 and Erofs utils:*
https://github.com/hsiangkao/erofs-utils
https://github.com/lz4/lz4

-- 
Thanks,
Saumya Prakash Panda

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Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Hi Experts, <br></div><div>=C2=A0=C2=A0 I am testing =
EROFS in openSuse(Kernel: 5.4.7-1-default). I used the enwik8 and enwik9 as=
 source file  (<a href=3D"https://cs.fit.edu/~mmahoney/compression/textdata=
.html">https://cs.fit.edu/~mmahoney/compression/textdata.html</a>) for comp=
ression. But after I mount the erofs image, I am not able to read it (it is=
 saying operation not permitted). Simple &quot;ls&quot; command is not work=
ing. But if I create EROFS image without compression flag, then after mount=
 I am able to read the files. Seems there is some problem during compressio=
n. <br></div><div><br></div><div>I will appreciate if someone can help me o=
ut why this is happening.<br></div><div><br></div><div>Steps followed: <br>=
</div><div><u>Erofs image creation &amp; mount: </u><br></div><div>mkfs.ero=
fs -zlz4hc enwik8.erofs.img enwik8/</div><div>mkfs.erofs 1.0<br>=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 c_version: =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 [ =C2=A0 =
=C2=A0 1.0]<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 c_dbg_lvl: =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 [ =C2=A0 =C2=A0 =C2=A0 0]<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 c_dr=
y_run: =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 [ =C2=A0 =C2=A0 =C2=A0 0]<br></di=
v><div>mount enwik8.erofs.img /mnt/enwik8/ -t erofs -o loop</div><div><br><=
/div><div>ls -l /mnt/enwik8/<br>ls: cannot access &#39;/mnt/enwik8/enwik8&#=
39;: Operation not supported<br>total 0<br>-????????? ? ? ? ? =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0? enwik8<br></div><div><br></div><div>The probl=
em seen for both lz4 &amp; lz4hc. <br></div><div><br></div><div><u>Erofs im=
age creation &amp; mount without compression: </u></div><div>mkfs.erofs =C2=
=A0enwik8_nocomp.erofs.img enwik8/<br>mkfs.erofs 1.0<br>=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 c_version: =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 [ =C2=A0 =C2=A0 1.=
0]<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 c_dbg_lvl: =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 [ =C2=A0 =C2=A0 =C2=A0 0]<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 c_dry_run: =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 [ =C2=A0 =C2=A0 =C2=A0 0]</div><div><br>=
</div><div>mount enwik8_nocomp.erofs.img /mnt/enwik8_nocomp/ -t erofs -o lo=
op</div><div><br></div><div>ls -l /mnt/enwik8_nocomp/<br>total 97660<br>-rw=
-r--r-- 1 root root 100000000 Jan 20 01:27 enwik8</div><div><br></div><div>=
<div><u>Original enwik8 file:</u><br></div><div>ls -l enwik8<br>total 97660=
<br>-rw-r--r-- 1 root root 100000000 Jan 20 01:14 enwik8</div></div><div><b=
r></div><div><u>Source code used for Lz4 and Erofs utils:</u><br></div><div=
><a href=3D"https://github.com/hsiangkao/erofs-utils">https://github.com/hs=
iangkao/erofs-utils</a></div><div><a href=3D"https://github.com/lz4/lz4">ht=
tps://github.com/lz4/lz4</a></div><div><br>-- <br><div dir=3D"ltr" class=3D=
"gmail_signature" data-smartmail=3D"gmail_signature">Thanks,<br>Saumya Prak=
ash Panda<br><br></div></div></div>

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