linux-ext4 - Re: [PATCH v3 16/16] ksmbd: Report filesystem case sensitivity via FS_ATTRIBUTE

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Message-ID: <CAKYAXd9kFLQmPPGsJ5rTGSqbXp2fA_Hh4-z0BDbGb2_HCQvgUw@mail.gmail.com>
Date: Wed, 14 Jan 2026 09:46:16 +0900
From: Namjae Jeon <linkinjeon@...nel.org>
To: Chuck Lever <cel@...nel.org>
Cc: Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>, linux-fsdevel@...r.kernel.org, 
	linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org, 
	linux-cifs@...r.kernel.org, linux-nfs@...r.kernel.org, 
	linux-f2fs-devel@...ts.sourceforge.net, hirofumi@...l.parknet.co.jp, 
	sj1557.seo@...sung.com, yuezhang.mo@...y.com, 
	almaz.alexandrovich@...agon-software.com, slava@...eyko.com, 
	glaubitz@...sik.fu-berlin.de, frank.li@...o.com, tytso@....edu, 
	adilger.kernel@...ger.ca, cem@...nel.org, sfrench@...ba.org, pc@...guebit.org, 
	ronniesahlberg@...il.com, sprasad@...rosoft.com, trondmy@...nel.org, 
	anna@...nel.org, jaegeuk@...nel.org, chao@...nel.org, hansg@...nel.org, 
	senozhatsky@...omium.org, Chuck Lever <chuck.lever@...cle.com>
Subject: Re: [PATCH v3 16/16] ksmbd: Report filesystem case sensitivity via FS_ATTRIBUTE_INFORMATION

On Tue, Jan 13, 2026 at 2:47 AM Chuck Lever <cel@...nel.org> wrote:
>
> From: Chuck Lever <chuck.lever@...cle.com>
>
> ksmbd hard-codes FILE_CASE_SENSITIVE_SEARCH and
> FILE_CASE_PRESERVED_NAMES in FS_ATTRIBUTE_INFORMATION responses,
> incorrectly indicating all exports are case-sensitive. This breaks
> clients accessing case-insensitive filesystems like exFAT or
> ext4/f2fs directories with casefold enabled.
>
> Query actual case behavior via vfs_fileattr_get() and report accurate
> attributes to SMB clients. Filesystems without ->fileattr_get continue
> reporting default POSIX behavior (case-sensitive, case-preserving).
>
> SMB's FS_ATTRIBUTE_INFORMATION reports per-share attributes from the
> share root, not per-file. Shares mixing casefold and non-casefold
> directories report the root directory's behavior.
>
> Signed-off-by: Chuck Lever <chuck.lever@...cle.com>
Acked-by: Namjae Jeon <linkinjeon@...nel.org>
Thanks!