[PATCH v3 07/16] ext4: Report case sensitivity in fileattr_get

[Chuck Lever <cel@kernel.org>]

From: Chuck Lever <chuck.lever@oracle.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).

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 fs/ext4/ioctl.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 7ce0fc40aec2..653035017c7f 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -996,6 +996,14 @@ 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 always preserves case. If this inode is a casefolded
+	 * directory, report case-insensitive; otherwise report
+	 * case-sensitive (standard POSIX behavior).
+	 */
+	fa->case_insensitive = IS_CASEFOLDED(inode);
+	fa->case_preserving = true;
+
 	return 0;
 }
 
-- 
2.52.0