linux-ext4 - [PATCH v3 08/16] xfs: Report case sensitivity in fileattr

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Message-ID: <20260112174629.3729358-9-cel@kernel.org>
Date: Mon, 12 Jan 2026 12:46:21 -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,
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	<linux-nfs@...r.kernel.org>,
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	Chuck Lever <chuck.lever@...cle.com>
Subject: [PATCH v3 08/16] xfs: Report case sensitivity in fileattr_get

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

Upper layers such as NFSD need to query whether a filesystem is
case-sensitive. Populate the case_insensitive and case_preserving
fields in xfs_fileattr_get(). XFS always preserves case. XFS is
case-sensitive by default, but supports ASCII case-insensitive
lookups when formatted with the ASCIICI feature flag.

Signed-off-by: Chuck Lever <chuck.lever@...cle.com>
---
 fs/xfs/xfs_ioctl.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 59eaad774371..97314fcb7732 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -516,6 +516,13 @@ xfs_fileattr_get(
 	xfs_fill_fsxattr(ip, XFS_DATA_FORK, fa);
 	xfs_iunlock(ip, XFS_ILOCK_SHARED);
 
+	/*
+	 * XFS is case-sensitive by default, but can be formatted with
+	 * ASCII case-insensitive mode enabled.
+	 */
+	fa->case_insensitive = xfs_has_asciici(ip->i_mount);
+	fa->case_preserving = true;
+
 	return 0;
 }
 
-- 
2.52.0