[PATCH v10 09/17] xfs: Report case sensitivity in fileattr_get

[Chuck Lever <cel@kernel.org>]

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

Upper layers such as NFSD need to query whether a filesystem
is case-sensitive. Add FS_XFLAG_CASEFOLD to xfs_ip2xflags()
when the filesystem is formatted with the ASCIICI feature
flag. This serves both FS_IOC_FSGETXATTR (via xfs_fill_fsxattr() in
xfs_fileattr_get()) and XFS_IOC_BULKSTAT (which populates bs_xflags
directly from xfs_ip2xflags()), so bulkstat consumers and per-inode
queries see a consistent view of the filesystem's case-folding
behavior.

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@oracle.com>
---
 fs/xfs/libxfs/xfs_inode_util.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/xfs/libxfs/xfs_inode_util.c b/fs/xfs/libxfs/xfs_inode_util.c
index 551fa51befb6..82be54b6f8d3 100644
--- a/fs/xfs/libxfs/xfs_inode_util.c
+++ b/fs/xfs/libxfs/xfs_inode_util.c
@@ -130,6 +130,8 @@ xfs_ip2xflags(
 
 	if (xfs_inode_has_attr_fork(ip))
 		flags |= FS_XFLAG_HASATTR;
+	if (xfs_has_asciici(ip->i_mount))
+		flags |= FS_XFLAG_CASEFOLD;
 	return flags;
 }
 

-- 
2.53.0