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From: Gabriel Krisman Bertazi <krisman@suse.de>
To: Eugen Hristev <eugen.hristev@collabora.com>
Cc: tytso@mit.edu,  adilger.kernel@dilger.ca,  linux-ext4@vger.kernel.org,
  jaegeuk@kernel.org,  chao@kernel.org,
  linux-f2fs-devel@lists.sourceforge.net,  linux-fsdevel@vger.kernel.org,
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  viro@zeniv.linux.org.uk,  brauner@kernel.org,  jack@suse.cz,  Gabriel
 Krisman Bertazi <krisman@collabora.com>
Subject: Re: [PATCH v10 3/8] libfs: Introduce case-insensitive string
 comparison helper
In-Reply-To: <fb32fc72-5434-4852-b7e9-f63fc03a8248@collabora.com> (Eugen
	Hristev's message of "Tue, 20 Feb 2024 09:36:40 +0200")
Organization: SUSE
References: <20240215042654.359210-1-eugen.hristev@collabora.com>
	<20240215042654.359210-4-eugen.hristev@collabora.com>
	<87zfw0bd6y.fsf@mailhost.krisman.be>
	<50d2afaa-fd7e-4772-ac84-24e8994bfba8@collabora.com>
	<87msrwbj18.fsf@mailhost.krisman.be>
	<fb32fc72-5434-4852-b7e9-f63fc03a8248@collabora.com>
Date: Tue, 20 Feb 2024 09:59:44 -0500
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Eugen Hristev <eugen.hristev@collabora.com> writes:

> Okay, I am changing it.
>
> By the way, is this supposed to work like this on case-insensitive directories ?
>
> user@debian-rockchip-rock5b-rk3588:~$ ls -la /media/CI_dir/*cuc
> ls: cannot access '/media/CI_dir/*cuc': No such file or directory
> user@debian-rockchip-rock5b-rk3588:~$ ls -la /media/CI_dir/*CUC
> -rw-r--r-- 1 root root 0 Feb 12 17:47 /media/CI_dir/CUC
> user@debian-rockchip-rock5b-rk3588:~$ ls -la /media/CI_dir/cuc
> -rw-r--r-- 1 root root 0 Feb 12 17:47 /media/CI_dir/cuc
> user@debian-rockchip-rock5b-rk3588:~$
>
>
> basically wildcards don't work.

Yes, at least from a kernel point of view.  Your shell does wildcards in
userspace, probably by doing getdents and then comparing with possible
matches.  Since the shell itself is not case-insensitive aware, its
comparison is case-sensitive, and you get these apparent weird
semantics.

Not ideal from a user point of view.  But not a kernel bug.  If it
pushes people away from using case-insensitive directories in their
day-to-day work and leave it to only be used by Windows compatibility
layers, maybe that's a win? :)

-- 
Gabriel Krisman Bertazi