diff --git a/fs/hmdfs/dentry.c b/fs/hmdfs/dentry.c
index 040d698e17850bcb70ce65c816441ae6ae0f584f..d89c34045da8f8617ed681f123f2000a9d66334c 100644
--- a/fs/hmdfs/dentry.c
+++ b/fs/hmdfs/dentry.c
@@ -310,7 +310,7 @@ static int d_revalidate_merge(struct dentry *direntry, unsigned int flags)
 		return 1;
 
 	parent_dentry = dget_parent(direntry);
-        mutex_lock(&dim->comrade_list_lock);
+	mutex_lock(&dim->comrade_list_lock);
 	list_for_each_entry(comrade, &(dim->comrade_list), list) {
 		lower_cur_parent_dentry = dget_parent(comrade->lo_d);
 		if ((comrade->lo_d->d_flags & DCACHE_OP_REVALIDATE)) {
@@ -324,19 +324,21 @@ static int d_revalidate_merge(struct dentry *direntry, unsigned int flags)
 		dput(lower_cur_parent_dentry);
 	}
 out:
-        mutex_unlock(&dim->comrade_list_lock);
+	mutex_unlock(&dim->comrade_list_lock);
 	dput(parent_dentry);
 	return ret;
 }
 
 static void d_release_merge(struct dentry *dentry)
 {
+	trace_d_release_merge_enter(dentry);
 	if (!dentry || !dentry->d_fsdata)
 		return;
 
 	clear_comrades(dentry);
 	kmem_cache_free(hmdfs_dentry_merge_cachep, dentry->d_fsdata);
 	dentry->d_fsdata = NULL;
+	trace_d_release_merge_exit(dentry);
 }
 
 const struct dentry_operations hmdfs_dops_merge = {
diff --git a/fs/hmdfs/hmdfs_merge_view.h b/fs/hmdfs/hmdfs_merge_view.h
index bf647780cf9c3fade150eecac9e21b02028d60a6..ed72cbd01e2a12c073be3e6e503e84bb687881a5 100644
--- a/fs/hmdfs/hmdfs_merge_view.h
+++ b/fs/hmdfs/hmdfs_merge_view.h
@@ -28,6 +28,7 @@ struct merge_lookup_work {
 	struct hmdfs_sb_info *sbi;
 	wait_queue_head_t *wait_queue;
 	struct work_struct work;
+	struct dentry *dentry;
 };
 
 struct hmdfs_dentry_info_merge {
@@ -118,8 +119,8 @@ struct hmdfs_dentry_comrade *lookup_comrade(struct path lower_path,
 					    unsigned int flags);
 bool is_valid_comrade(struct hmdfs_dentry_info_merge *mdi, umode_t mode);
 int merge_lookup_async(struct hmdfs_dentry_info_merge *mdi,
-		       struct hmdfs_sb_info *sbi, int devid,
-		       const char *name, unsigned int flags);
+		       struct hmdfs_sb_info *sbi, struct dentry *dentry,
+		       int devid, const char *name, unsigned int flags);
 char *hmdfs_get_real_dname(struct dentry *dentry, int *devid, int *type);
 void lock_root_inode_shared(struct inode *root, bool *locked, bool *down);
 void restore_root_inode_sem(struct inode *root, bool locked, bool down);
diff --git a/fs/hmdfs/hmdfs_trace.h b/fs/hmdfs/hmdfs_trace.h
index df098885e83aaee518e8333161c4815624aa3d1c..65ca11bcf7e61a6413edbf3d15f862b6b5c86ab7 100644
--- a/fs/hmdfs/hmdfs_trace.h
+++ b/fs/hmdfs/hmdfs_trace.h
@@ -883,6 +883,40 @@ TRACE_EVENT(hmdfs_merge_update_dentry_info_exit,
 		__get_str(dst_name))
 );
 
+TRACE_EVENT(d_release_merge_enter,
+
+	TP_PROTO(struct dentry *dentry),
+
+	TP_ARGS(dentry),
+
+	TP_STRUCT__entry(
+		__string(name, 		dentry->d_name.name)
+	),
+
+	TP_fast_assign(
+		__assign_str(name, dentry->d_name.name);
+	),
+
+	TP_printk("name:%s", __get_str(name))
+);
+
+TRACE_EVENT(d_release_merge_exit,
+
+	TP_PROTO(struct dentry *dentry),
+
+	TP_ARGS(dentry),
+
+	TP_STRUCT__entry(
+		__string(name, 		dentry->d_name.name)
+	),
+
+	TP_fast_assign(
+		__assign_str(name, dentry->d_name.name);
+	),
+
+	TP_printk("name:%s", __get_str(name))
+);
+
 #endif
 
 #undef TRACE_INCLUDE_PATH
diff --git a/fs/hmdfs/inode_merge.c b/fs/hmdfs/inode_merge.c
index 636c8bc55c40b20f8e80768c02e6cd31809a5ea8..015d1532ae30e0446d93dccb16947235310c4219 100644
--- a/fs/hmdfs/inode_merge.c
+++ b/fs/hmdfs/inode_merge.c
@@ -427,14 +427,16 @@ static void merge_lookup_work_func(struct work_struct *work)
 		wake_up_all(ml_work->wait_queue);
 	mutex_unlock(&mdi->work_lock);
 
+	dput(ml_work->dentry);
+
 	trace_hmdfs_merge_lookup_work_exit(ml_work, found);
 	kfree(ml_work->name);
 	kfree(ml_work);
 }
 
 int merge_lookup_async(struct hmdfs_dentry_info_merge *mdi,
-	struct hmdfs_sb_info *sbi, int devid, const char *name,
-	unsigned int flags)
+	struct hmdfs_sb_info *sbi, struct dentry *dentry, int devid,
+	const char *name, unsigned int flags)
 {
 	int err = -ENOMEM;
 	struct merge_lookup_work *ml_work;
@@ -453,6 +455,8 @@ int merge_lookup_async(struct hmdfs_dentry_info_merge *mdi,
 	ml_work->flags = flags;
 	ml_work->sbi = sbi;
 	ml_work->wait_queue = &mdi->wait_queue;
+	ml_work->dentry = dentry;
+	dget(dentry);
 	INIT_WORK(&ml_work->work, merge_lookup_work_func);
 
 	schedule_work(&ml_work->work);
@@ -510,7 +514,7 @@ static int lookup_merge_normal(struct dentry *dentry, unsigned int flags)
 	if (mdi->type != DT_REG || devid == 0) {
 		snprintf(cpath, PATH_MAX, "device_view/local%s/%s", ppath,
 			rname);
-		err = merge_lookup_async(mdi, sbi, 0, cpath, flags);
+		err = merge_lookup_async(mdi, sbi, dentry, 0, cpath, flags);
 		if (err)
 			hmdfs_err("failed to create local lookup work");
 	}
@@ -520,8 +524,8 @@ static int lookup_merge_normal(struct dentry *dentry, unsigned int flags)
 			continue;
 		snprintf(cpath, PATH_MAX, "device_view/%s%s/%s", peer->cid,
 			ppath, rname);
-		err = merge_lookup_async(mdi, sbi, peer->device_id, cpath,
-			flags);
+		err = merge_lookup_async(mdi, sbi, dentry, peer->device_id,
+			cpath, flags);
 		if (err)
 			hmdfs_err("failed to create remote lookup work");
 	}