freeze/thaw of upper is all that is needed.
Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxx>
---
fs/overlayfs/super.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index 6792bb7..0f8a9c8 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -160,6 +160,20 @@ static void ovl_put_super(struct super_block *sb)
kfree(ufs);
}
+static int ovl_freeze(struct super_block *sb)
+{
+ struct ovl_fs *ufs = sb->s_fs_info;
+
+ return ufs->upper_mnt ? freeze_super(ufs->upper_mnt->mnt_sb) : 0;
+}
+
+static int ovl_unfreeze(struct super_block *sb)
+{
+ struct ovl_fs *ufs = sb->s_fs_info;
+
+ return ufs->upper_mnt ? thaw_super(ufs->upper_mnt->mnt_sb) : 0;
+}
+
/**
* ovl_statfs
* @sb: The overlayfs super block
@@ -222,6 +236,8 @@ static int ovl_remount(struct super_block *sb, int *flags, char *data)
static const struct super_operations ovl_super_operations = {
.put_super = ovl_put_super,
+ .freeze_fs = ovl_freeze,
+ .unfreeze_fs = ovl_unfreeze,
.statfs = ovl_statfs,
.show_options = ovl_show_options,
.remount_fs = ovl_remount,
--
2.7.4
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