diff --git a/src/concurrency/ocf_mio_concurrency.c b/src/concurrency/ocf_mio_concurrency.c
new file mode 100644
index 0000000..ff9a35b
--- /dev/null
+++ b/src/concurrency/ocf_mio_concurrency.c
@@ -0,0 +1,137 @@
+/*
+ * Copyright(c) 2021 Intel Corporation
+ * SPDX-License-Identifier: BSD-3-Clause-Clear
+ */
+
+#include "ocf_concurrency.h"
+#include "../metadata/metadata_io.h"
+#include "../ocf_priv.h"
+#include "../ocf_request.h"
+#include "../utils/utils_alock.h"
+#include "../utils/utils_cache_line.h"
+
+struct ocf_mio_alock
+{
+	unsigned first_page;
+	unsigned num_pages;
+};
+
+static bool ocf_mio_lock_line_needs_lock(struct ocf_alock *alock,
+		struct ocf_request *req, unsigned index)
+{
+	return true;
+}
+
+static bool ocf_mio_lock_line_is_acting(struct ocf_alock *alock,
+		struct ocf_request *req, unsigned index)
+{
+	return true;
+}
+
+static bool ocf_mio_lock_line_is_locked(struct ocf_alock *alock,
+		struct ocf_request *req, unsigned index, int rw)
+{
+	struct metadata_io_request *m_req = (struct metadata_io_request *)req;
+
+	if (rw == OCF_WRITE)
+		return env_bit_test(index, &m_req->map);
+	else
+		return false;
+}
+
+static void ocf_mio_lock_line_mark_locked(struct ocf_alock *alock,
+		struct ocf_request *req, unsigned index, int rw, bool locked)
+{
+	struct metadata_io_request *m_req = (struct metadata_io_request *)req;
+
+	if (rw == OCF_READ)
+		return;
+	if (locked)
+		env_bit_set(index, &m_req->map);
+	else
+		env_bit_clear(index, &m_req->map);
+}
+
+static ocf_cache_line_t ocf_mio_lock_line_get_entry(
+		struct ocf_alock *alock, struct ocf_request *req,
+		unsigned index)
+{
+	struct ocf_mio_alock *mio_alock = (void*)alock + ocf_alock_obj_size();
+	struct metadata_io_request *m_req = (struct metadata_io_request *)req;
+	unsigned page = m_req->page + index;
+
+	ENV_BUG_ON(page < mio_alock->first_page);
+	ENV_BUG_ON(page >= mio_alock->first_page + mio_alock->num_pages);
+
+	return page - mio_alock->first_page;
+}
+
+static struct ocf_alock_lock_cbs ocf_mio_conc_cbs = {
+		.line_needs_lock = ocf_mio_lock_line_needs_lock,
+		.line_is_acting = ocf_mio_lock_line_is_acting,
+		.line_is_locked = ocf_mio_lock_line_is_locked,
+		.line_mark_locked = ocf_mio_lock_line_mark_locked,
+		.line_get_entry = ocf_mio_lock_line_get_entry
+};
+
+int ocf_mio_async_lock(struct ocf_alock *alock,
+		struct metadata_io_request *m_req,
+		ocf_req_async_lock_cb cmpl)
+{
+	struct ocf_alock_lock_cbs *cbs =
+			&ocf_mio_conc_cbs;
+
+	return ocf_alock_lock_wr(alock, cbs, &m_req->req, cmpl);
+}
+
+void ocf_mio_async_unlock(struct ocf_alock *alock,
+		struct metadata_io_request *m_req)
+{
+	struct ocf_alock_lock_cbs *cbs =
+			&ocf_mio_conc_cbs;
+
+	ocf_alock_unlock_wr(alock, cbs, &m_req->req);
+	m_req->map = 0;
+}
+
+
+#define ALLOCATOR_NAME_FMT "ocf_%s_mio_concurrency"
+#define ALLOCATOR_NAME_MAX (sizeof(ALLOCATOR_NAME_FMT) + OCF_CACHE_NAME_SIZE)
+
+int ocf_mio_concurrency_init(struct ocf_alock **self,
+		unsigned first_page, unsigned num_pages,
+		ocf_cache_t cache)
+{
+	struct ocf_alock *alock;
+	struct ocf_mio_alock *mio_alock;
+	size_t base_size = ocf_alock_obj_size();
+	char name[ALLOCATOR_NAME_MAX];
+	int ret;
+
+	ret = snprintf(name, sizeof(name), ALLOCATOR_NAME_FMT,
+			ocf_cache_get_name(cache));
+	if (ret < 0)
+		return ret;
+	if (ret >= ALLOCATOR_NAME_MAX)
+		return -ENOSPC;
+
+	alock = env_vzalloc(base_size + sizeof(struct ocf_mio_alock));
+	if (!alock)
+		return -OCF_ERR_NO_MEM;
+
+	ret = ocf_alock_init_inplace(alock, num_pages, name, cache);
+	if (ret)
+		return ret;
+
+	mio_alock = (void*)alock + base_size;
+	mio_alock->first_page = first_page;
+	mio_alock->num_pages = num_pages;
+
+	*self = alock;
+	return 0;
+}
+
+void ocf_mio_concurrency_deinit(struct ocf_alock **self)
+{
+	ocf_alock_deinit(self);
+}
diff --git a/src/concurrency/ocf_mio_concurrency.h b/src/concurrency/ocf_mio_concurrency.h
new file mode 100644
index 0000000..ae9318b
--- /dev/null
+++ b/src/concurrency/ocf_mio_concurrency.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright(c) 2021-2021 Intel Corporation
+ * SPDX-License-Identifier: BSD-3-Clause-Clear
+ */
+
+#ifndef OCF_COLLISION_UPDATE_CONCURRENCY_H_
+#define OCF_COLLISION_UPDATE_CONCURRENCY_H_
+
+#include "../utils/utils_alock.h"
+
+int ocf_mio_async_lock(struct ocf_alock *alock,
+		struct metadata_io_request *m_req,
+		ocf_req_async_lock_cb cmpl);
+
+void ocf_mio_async_unlock(struct ocf_alock *alock,
+		struct metadata_io_request *m_req);
+
+int ocf_mio_concurrency_init(struct ocf_alock **self,
+		unsigned first_page, unsigned num_pages,
+		ocf_cache_t cache);
+
+void ocf_mio_concurrency_deinit(struct ocf_alock **self);
+
+#endif
diff --git a/src/metadata/metadata_io.h b/src/metadata/metadata_io.h
index c26adf8..1efc91b 100644
--- a/src/metadata/metadata_io.h
+++ b/src/metadata/metadata_io.h
@@ -54,6 +54,7 @@ struct metadata_io_request {
 	env_atomic finished;
 	uint32_t page;
 	uint32_t count;
+	uint64_t map;
 };
 
 /*
diff --git a/src/utils/utils_alock.c b/src/utils/utils_alock.c
index 73ebc3f..f83aa92 100644
--- a/src/utils/utils_alock.c
+++ b/src/utils/utils_alock.c
@@ -62,78 +62,94 @@ struct ocf_alock {
 
 };
 
-int ocf_alock_init(struct ocf_alock **self, unsigned num_entries,
+size_t ocf_alock_obj_size(void)
+{
+	return sizeof(struct ocf_alock);
+}
+
+int ocf_alock_init_inplace(struct ocf_alock *self, unsigned num_entries,
 		const char* name, ocf_cache_t cache)
 {
 	uint32_t i;
 	int error = 0;
-	struct ocf_alock *alock;
 
 	OCF_DEBUG_TRACE(cache);
 
-	alock = env_vzalloc(sizeof(*alock));
-	if (!alock) {
-		error = __LINE__;
-		goto exit_err;
-	}
+	self->cache = cache;
+	self->num_entries = num_entries;
 
-	alock->cache = cache;
-	alock->num_entries = num_entries;
-
-	error = env_mutex_init(&alock->lock);
+	error = env_mutex_init(&self->lock);
 	if (error) {
 		error = __LINE__;
 		goto rwsem_err;
 	}
 
-	alock->access = env_vzalloc(num_entries * sizeof(alock->access[0]));
+	self->access = env_vzalloc(num_entries * sizeof(self->access[0]));
 
-	if (!alock->access) {
+	if (!self->access) {
 		error = __LINE__;
 		goto allocation_err;
 	}
 
-	alock->allocator = env_allocator_create(sizeof(struct ocf_alock_waiter), name, false);
-	if (!alock->allocator) {
+	self->allocator = env_allocator_create(sizeof(struct ocf_alock_waiter), name, false);
+	if (!self->allocator) {
 		error = __LINE__;
 		goto allocation_err;
 	}
 
 	/* Init concurrency control table */
 	for (i = 0; i < _WAITERS_LIST_ENTRIES; i++) {
-		INIT_LIST_HEAD(&alock->waiters_lsts[i].head);
-		error = env_spinlock_init(&alock->waiters_lsts[i].lock);
+		INIT_LIST_HEAD(&self->waiters_lsts[i].head);
+		error = env_spinlock_init(&self->waiters_lsts[i].lock);
 		if (error) {
 			error = __LINE__;
 			goto spinlock_err;
 		}
 	}
 
-	*self = alock;
 	return 0;
 
 spinlock_err:
 	while (i--)
-		env_spinlock_destroy(&alock->waiters_lsts[i].lock);
+		env_spinlock_destroy(&self->waiters_lsts[i].lock);
 
 allocation_err:
-	if (alock->allocator)
-		env_allocator_destroy(alock->allocator);
+	if (self->allocator)
+		env_allocator_destroy(self->allocator);
 
-	if (alock->access)
-		env_vfree(alock->access);
+	if (self->access)
+		env_vfree(self->access);
 
 rwsem_err:
-	env_mutex_destroy(&alock->lock);
+	env_mutex_destroy(&self->lock);
 
-exit_err:
 	ocf_cache_log(cache, log_err, "Cannot initialize cache concurrency, "
 			"ERROR %d", error);
-	if (alock)
+
+	return -1;
+}
+
+int ocf_alock_init(struct ocf_alock **self, unsigned num_entries,
+		const char* name, ocf_cache_t cache)
+{
+	struct ocf_alock *alock;
+	int ret;
+
+	OCF_DEBUG_TRACE(cache);
+
+	alock = env_vzalloc(sizeof(*alock));
+	if (!alock)
+		return -OCF_ERR_NO_MEM;
+
+	ret = ocf_alock_init_inplace(alock, num_entries,
+			name, cache);
+
+	if (!ret)
+		*self = alock;
+	else
 		env_vfree(alock);
 
-	*self = NULL;
-	return -1;
+	return ret;
 }
 
 void ocf_alock_deinit(struct ocf_alock **self)
diff --git a/src/utils/utils_alock.h b/src/utils/utils_alock.h
index d647abb..e2004af 100644
--- a/src/utils/utils_alock.h
+++ b/src/utils/utils_alock.h
@@ -87,6 +87,11 @@ bool ocf_alock_is_locked_exclusively(struct ocf_alock *alock,
 
 uint32_t ocf_alock_waitlist_count(struct ocf_alock *alock);
 
+size_t ocf_alock_obj_size(void);
+
+int ocf_alock_init_inplace(struct ocf_alock *self, unsigned num_entries,
+		const char* name, ocf_cache_t cache);
+
 int ocf_alock_init(struct ocf_alock **self, unsigned num_entries,
 		const char* name, ocf_cache_t cache);