linux-ext4 - [PATCH v5 11/16] f2fs: Add case sensitivity reporting to fileattr

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Message-ID: <20260116144616.2098618-12-cel@kernel.org>
Date: Fri, 16 Jan 2026 09:46:10 -0500
From: Chuck Lever <cel@...nel.org>
To: Al Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>,
	Jan Kara <jack@...e.cz>
Cc: <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,
	linkinjeon@...nel.org,
	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,
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	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: [PATCH v5 11/16] f2fs: Add case sensitivity reporting to fileattr_get

From: Chuck Lever <chuck.lever@...cle.com>

NFS and other remote filesystem protocols need to determine
whether a local filesystem performs case-insensitive lookups
so they can provide correct semantics to clients. Without
this information, f2fs exports cannot properly advertise
their filename case behavior.

Report f2fs case sensitivity behavior via the file_kattr
boolean fields. Like ext4, f2fs supports per-directory case
folding via the casefold flag (IS_CASEFOLDED). Files are
always case-preserving.

Reviewed-by: Chao Yu <chao@...nel.org>
Signed-off-by: Chuck Lever <chuck.lever@...cle.com>
---
 fs/f2fs/file.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index d7047ca6b98d..5d4c129c9802 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -3439,6 +3439,12 @@ int f2fs_fileattr_get(struct dentry *dentry, struct file_kattr *fa)
 	if (f2fs_sb_has_project_quota(F2FS_I_SB(inode)))
 		fa->fsx_projid = from_kprojid(&init_user_ns, fi->i_projid);
 
+	/*
+	 * f2fs preserves case (the default). If this inode is a
+	 * casefolded directory, report case-insensitive; otherwise
+	 * report case-sensitive (standard POSIX behavior).
+	 */
+	fa->case_insensitive = IS_CASEFOLDED(inode);
 	return 0;
 }
 
-- 
2.52.0