On inode creation copy certain inode flags from the underlying real inode
to the overlay inode.
This is in preparation for moving overlay functionality out of the VFS.
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxxxxx>
---
fs/overlayfs/overlayfs.h | 7 +++++++
fs/overlayfs/util.c | 1 +
2 files changed, 8 insertions(+)
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index eef720ef0f07..265cb288417a 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -357,6 +357,13 @@ static inline void ovl_copyattr(struct inode *from, struct inode *to)
to->i_ctime = from->i_ctime;
}
+static inline void ovl_copyflags(struct inode *from, struct inode *to)
+{
+ unsigned int mask = S_SYNC | S_IMMUTABLE | S_APPEND | S_NOATIME;
+
+ inode_set_flags(to, from->i_flags & mask, mask);
+}
+
/* dir.c */
extern const struct inode_operations ovl_dir_inode_operations;
struct dentry *ovl_lookup_temp(struct dentry *workdir);
diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c
index 11e62e70733a..586f8d7440bb 100644
--- a/fs/overlayfs/util.c
+++ b/fs/overlayfs/util.c
@@ -310,6 +310,7 @@ void ovl_inode_init(struct inode *inode, struct dentry *upperdentry,
OVL_I(inode)->lower = igrab(d_inode(lowerdentry));
ovl_copyattr(realinode, inode);
+ ovl_copyflags(realinode, inode);
if (!inode->i_ino)
inode->i_ino = realinode->i_ino;
}
--
2.14.3
