linux-ext4 - Re: [PATCH v3 01/10] ovl: Reject mounting case-insensitive filesystems

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Date: Wed, 24 Jan 2024 18:51:15 -0800
From: Eric Biggers <ebiggers@...nel.org>
To: Gabriel Krisman Bertazi <krisman@...e.de>
Cc: viro@...iv.linux.org.uk, jaegeuk@...nel.org, tytso@....edu,
	linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
	linux-fsdevel@...r.kernel.org, amir73il@...il.com
Subject: Re: [PATCH v3 01/10] ovl: Reject mounting case-insensitive
 filesystems

On Fri, Jan 19, 2024 at 03:47:33PM -0300, Gabriel Krisman Bertazi wrote:
> ovl: Reject mounting case-insensitive filesystems

Overlayfs doesn't mount filesystems.  I think you might mean something like
reject case-insensitive lowerdirs?

> +	/*
> +	 * Root dentries of case-insensitive filesystems might not have
> +	 * the dentry operations set, but still be incompatible with
> +	 * overlayfs.  Check explicitly to prevent post-mount failures.
> +	 */
> +	if (sb_has_encoding(path->mnt->mnt_sb))
> +		return invalfc(fc, "case-insensitive filesystem on %s not supported", name);

sb_has_encoding() doesn't mean that the filesystem is case-insensitive.  It
means that the filesystem supports individual case-insensitive directories.

With that in mind, is this code still working as intended?

If so, can you update the comment and error message accordingly?

- Eric