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-rw-r--r--fs/overlayfs/overlayfs.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index 2433cc030c87..e9b3e7880fc0 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -263,6 +263,18 @@ static inline bool ovl_open_flags_need_copy_up(int flags)
return ((OPEN_FMODE(flags) & FMODE_WRITE) || (flags & O_TRUNC));
}
+static inline bool ovl_allow_offline_changes(struct ovl_fs *ofs)
+{
+ /*
+ * To avoid regressions in existing setups with overlay lower offline
+ * changes, we allow lower changes only if none of the new features
+ * are used.
+ */
+ return (!ofs->config.index && !ofs->config.metacopy &&
+ !ofs->config.redirect_dir && ofs->config.xino != OVL_XINO_ON);
+}
+
+
/* util.c */
int ovl_want_write(struct dentry *dentry);
void ovl_drop_write(struct dentry *dentry);