linux-ext4 - Re: [RESEND PATCH v9 1/3] libfs: Introduce case-insensitive string comparison helper

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Date: Tue, 13 Feb 2024 11:09:16 -0500
From: Gabriel Krisman Bertazi <krisman@...e.de>
To: Eugen Hristev <eugen.hristev@...labora.com>
Cc: tytso@....edu,  adilger.kernel@...ger.ca,  jaegeuk@...nel.org,
  chao@...nel.org,  viro@...iv.linux.org.uk,  brauner@...nel.org,
  linux-ext4@...r.kernel.org,  linux-f2fs-devel@...ts.sourceforge.net,
  jack@...e.cz,  linux-kernel@...r.kernel.org,
  linux-fsdevel@...r.kernel.org,  kernel@...labora.com,  Gabriel Krisman
 Bertazi <krisman@...labora.com>,  Eric Biggers <ebiggers@...gle.com>
Subject: Re: [RESEND PATCH v9 1/3] libfs: Introduce case-insensitive string
 comparison helper

Eugen Hristev <eugen.hristev@...labora.com> writes:

> On 2/9/24 16:40, Gabriel Krisman Bertazi wrote:
>> Eugen Hristev <eugen.hristev@...labora.com> writes:
> With the changes you suggested, I get these errors now :
>
> [  107.409410] EXT4-fs error (device sda1): ext4_lookup:1816: inode #521217: comm
> ls: 'CUC' linked to parent dir
> ls: cannot access '/media/CI_dir/CUC': Structure needs cleaning
> total 8
> drwxr-xr-x 2 root root 4096 Feb 12 11:51 .
> drwxr-xr-x 4 root root 4096 Feb 12 11:47 ..
> -????????? ? ?    ?       ?            ? CUC
>
> Do you have any idea about what is wrong ?

Hm, there's a bug somewhere. The lookup got broken and ls got an error.
Did you debug it a bit?  can you share the code and a reproducer?

>From a quick look at the example I suggested, utf8_strncasecmp* return 0
on match, but ext4_match should return true when matched. So remember to
negate the output:

...
res = !utf8_strncasecmp(um, name, &dirent);
...

-- 
Gabriel Krisman Bertazi