[PATCH v9 09/17] xfs: Report case sensitivity in fileattr_get
From: Chuck Lever <cel@kernel.org>
Date: 2026-04-22 23:30:38
Also in:
linux-cifs, linux-ext4, linux-f2fs-devel, linux-fsdevel, linux-nfs, linux-xfs
Subsystem:
filesystems (vfs and infrastructure), the rest, xfs filesystem · Maintainers:
Alexander Viro, Christian Brauner, Linus Torvalds, Carlos Maiolino
From: Chuck Lever <redacted> Upper layers such as NFSD need to query whether a filesystem is case-sensitive. Report case sensitivity via the FS_XFLAG_CASEFOLD flag 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. Reviewed-by: "Darrick J. Wong" <djwong@kernel.org> Signed-off-by: Chuck Lever <redacted> --- 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 ed9b4846c05f..b3c46a7ece62 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c@@ -537,6 +537,13 @@ xfs_fileattr_get( xfs_fill_fsxattr(ip, XFS_DATA_FORK, fa); xfs_iunlock(ip, XFS_ILOCK_SHARED); + /* + * FS_XFLAG_CASEFOLD indicates case-insensitive lookups with + * case preservation. This matches ASCIICI behavior: lookups + * fold ASCII case while filenames remain stored verbatim. + */ + if (xfs_has_asciici(ip->i_mount)) + fa->fsx_xflags |= FS_XFLAG_CASEFOLD; return 0; }
--
2.53.0