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

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Date: Tue, 13 Feb 2024 06:44:16 +0200
From: Eugen Hristev <eugen.hristev@...labora.com>
To: Gabriel Krisman Bertazi <krisman@...e.de>
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

On 2/9/24 16:40, Gabriel Krisman Bertazi wrote:
> Eugen Hristev <eugen.hristev@...labora.com> writes:
> 
>> On 2/8/24 20:38, Gabriel Krisman Bertazi wrote:
> 
>>> (untested)
>>
>> I implemented your suggestion, but any idea about testing ? I ran smoke on xfstests
>> and it appears to be fine, but maybe some specific test case might try the
>> different paths here ?
> 
> Other than running the fstests quick group for each affected filesystems
> looking for regressions, the way I'd do it is create a few files and
> look them up with exact and inexact name matches.  While doing that,
> observe through bpftrace which functions got called and what they
> returned.
> 
> Here, since you are testing the uncached lookup, you want to make sure
> to drop the cached version prior to each lookup.
> 


Hello Gabriel,

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 ?

Thanks,
Eugen