From: Gao Xiang via Linux-erofs <linux-erofs@lists.ozlabs.org>
To: Saumya Panda <saumya.iisc@gmail.com>
Cc: linux-erofs@lists.ozlabs.org
Subject: Re: Problem in EROFS: Not able to read the files after mount
Date: Mon, 20 Jan 2020 15:41:37 +0800 [thread overview]
Message-ID: <20200120073859.GA32421@hsiangkao-HP-ZHAN-66-Pro-G1> (raw)
In-Reply-To: <CAHmfoRm7xUwuXfTZ2kr-x9fs59x7b707t183ggbLEtEyO_wznA@mail.gmail.com>
Hi Saumya,
On Mon, Jan 20, 2020 at 12:25:15PM +0530, Saumya Panda wrote:
> 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.
Could you please check if your opensuse kernel has been enabled
the following configuration?
CONFIG_EROFS_FS_ZIP=y
CONFIG_EROFS_FS_CLUSTER_PAGE_LIMIT=1
By default, they should be enabled, but it seems not according to
the following information you mentioned.
Thanks,
Gao Xiang
>
> 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
next prev parent reply other threads:[~2020-01-20 7:42 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-20 6:55 Problem in EROFS: Not able to read the files after mount Saumya Panda
2020-01-20 7:41 ` Gao Xiang via Linux-erofs [this message]
2020-01-22 3:57 ` Saumya Panda
2020-01-22 4:37 ` Gao Xiang via Linux-erofs
2020-01-29 4:13 ` Saumya Panda
2020-01-29 4:50 ` Gao Xiang via Linux-erofs
2020-01-29 4:59 ` Gao Xiang via Linux-erofs
2020-03-20 8:00 ` Saumya Panda
2020-03-20 11:16 ` Gao Xiang via Linux-erofs
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