From: Chuck Lever <[email protected]>

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 <[email protected]>
---
 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



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