linux-ext4 - [PATCH v4 07/16] ext4: Report case sensitivity in fileattr

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Message-ID: <20260114142900.3945054-8-cel@kernel.org>
Date: Wed, 14 Jan 2026 09:28:50 -0500
From: Chuck Lever <cel@...nel.org>
To: vira@....codeaurora.org, 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,
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	frank.li@...o.com,
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	senozhatsky@...omium.org,
	Chuck Lever <chuck.lever@...cle.com>
Subject: [PATCH v4 07/16] ext4: Report case sensitivity in fileattr_get

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

Report ext4's case sensitivity behavior via file_kattr boolean
fields. ext4 always preserves case at rest.

Case sensitivity is a per-directory setting in ext4. If the queried
inode is a casefolded directory, report case-insensitive; otherwise
report case-sensitive (standard POSIX behavior).

Reviewed-by: Jan Kara <jack@...e.cz>
Signed-off-by: Chuck Lever <chuck.lever@...cle.com>
---
 fs/ext4/ioctl.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 7ce0fc40aec2..213769d217c3 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -996,6 +996,12 @@ int ext4_fileattr_get(struct dentry *dentry, struct file_kattr *fa)
 	if (ext4_has_feature_project(inode->i_sb))
 		fa->fsx_projid = from_kprojid(&init_user_ns, ei->i_projid);
 
+	/*
+	 * ext4 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