[PATCH v4 3/9] overlayfs: allow it to handle multigrain timestamps

[Jeff Layton <jlayton@kernel.org>]

Ensure that we strip off the I_CTIME_QUERIED bit when copying up.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 fs/overlayfs/file.c | 7 +++++--
 fs/overlayfs/util.c | 2 +-
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c
index 7c04f033aadd..cad715df8c4e 100644
--- a/fs/overlayfs/file.c
+++ b/fs/overlayfs/file.c
@@ -222,6 +222,7 @@ static loff_t ovl_llseek(struct file *file, loff_t offset, int whence)
 static void ovl_file_accessed(struct file *file)
 {
 	struct inode *inode, *upperinode;
+	struct timespec64 ctime, uctime;
 
 	if (file->f_flags & O_NOATIME)
 		return;
@@ -232,10 +233,12 @@ static void ovl_file_accessed(struct file *file)
 	if (!upperinode)
 		return;
 
+	ctime = ctime_peek(inode);
+	uctime = ctime_peek(upperinode);
 	if ((!timespec64_equal(&inode->i_mtime, &upperinode->i_mtime) ||
-	     !timespec64_equal(&inode->i_ctime, &upperinode->i_ctime))) {
+	     !timespec64_equal(&ctime, &uctime))) {
 		inode->i_mtime = upperinode->i_mtime;
-		inode->i_ctime = upperinode->i_ctime;
+		inode->i_ctime = uctime;
 	}
 
 	touch_atime(&file->f_path);
diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c
index 923d66d131c1..f4f9d7e189ef 100644
--- a/fs/overlayfs/util.c
+++ b/fs/overlayfs/util.c
@@ -1117,6 +1117,6 @@ void ovl_copyattr(struct inode *inode)
 	inode->i_mode = realinode->i_mode;
 	inode->i_atime = realinode->i_atime;
 	inode->i_mtime = realinode->i_mtime;
-	inode->i_ctime = realinode->i_ctime;
+	inode->i_ctime = ctime_peek(realinode);
 	i_size_write(inode, i_size_read(realinode));
 }
-- 
2.40.1