diff --git a/include/linux/fs.h b/include/linux/fs.h
index 83253f34416d..a35a0ffbee66 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1840,6 +1840,11 @@ struct super_operations {
 #else
 #define S_DAX		0	/* Make all the DAX code disappear */
 #endif
+#define S_HUGE_MODE		0xc000
+#define S_HUGE_NEVER		0x0000
+#define S_HUGE_ALWAYS		0x4000
+#define S_HUGE_WITHIN_SIZE	0x8000
+#define S_HUGE_ADVISE		0xc000
 
 /*
  * Note that nosuid etc flags are inode-specific: setting some file-system
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 81363b834900..d9cf4e0f35dc 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -191,14 +191,20 @@ static inline int page_cache_add_speculative(struct page *page, int count)
 }
 
 #ifdef CONFIG_NUMA
-extern struct page *__page_cache_alloc(gfp_t gfp);
+extern struct page *__page_cache_alloc_order(gfp_t gfp, unsigned int order);
 #else
-static inline struct page *__page_cache_alloc(gfp_t gfp)
+static inline struct page *__page_cache_alloc_order(gfp_t gfp,
+		unsigned int order)
 {
-	return alloc_pages(gfp, 0);
+	return alloc_pages(gfp, order);
 }
 #endif
 
+static inline struct page *__page_cache_alloc(gfp_t gfp)
+{
+	return __page_cache_alloc_order(gfp, 0);
+}
+
 static inline struct page *page_cache_alloc(struct address_space *x)
 {
 	return __page_cache_alloc(mapping_gfp_mask(x));
@@ -215,6 +221,15 @@ static inline gfp_t readahead_gfp_mask(struct address_space *x)
 				  __GFP_COLD | __GFP_NORETRY | __GFP_NOWARN;
 }
 
+extern bool __page_cache_allow_huge(struct address_space *x, pgoff_t offset);
+static inline bool page_cache_allow_huge(struct address_space *x,
+		pgoff_t offset)
+{
+	if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE))
+		return false;
+	return __page_cache_allow_huge(x, offset);
+}
+
 typedef int filler_t(void *, struct page *);
 
 pgoff_t page_cache_next_hole(struct address_space *mapping,
diff --git a/mm/filemap.c b/mm/filemap.c
index f2640fe345dd..ae1d996fa089 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -637,14 +637,14 @@ static int __add_to_page_cache_locked(struct page *page,
 				      pgoff_t offset, gfp_t gfp_mask,
 				      void **shadowp)
 {
-	int huge = PageHuge(page);
+	int hugetlb = PageHuge(page);
 	struct mem_cgroup *memcg;
 	int error;
 
 	VM_BUG_ON_PAGE(!PageLocked(page), page);
 	VM_BUG_ON_PAGE(PageSwapBacked(page), page);
 
-	if (!huge) {
+	if (!hugetlb) {
 		error = mem_cgroup_try_charge(page, current->mm,
 					      gfp_mask, &memcg, false);
 		if (error)
@@ -653,7 +653,7 @@ static int __add_to_page_cache_locked(struct page *page,
 
 	error = radix_tree_maybe_preload(gfp_mask & ~__GFP_HIGHMEM);
 	if (error) {
-		if (!huge)
+		if (!hugetlb)
 			mem_cgroup_cancel_charge(page, memcg, false);
 		return error;
 	}
@@ -663,16 +663,55 @@ static int __add_to_page_cache_locked(struct page *page,
 	page->index = offset;
 
 	spin_lock_irq(&mapping->tree_lock);
-	error = page_cache_tree_insert(mapping, page, shadowp);
+	if (PageTransHuge(page)) {
+		struct radix_tree_iter iter;
+		void **slot;
+		void *p;
+
+		error = 0;
+
+		/* Wipe shadow entires */
+		radix_tree_for_each_slot(slot, &mapping->page_tree, &iter, offset) {
+			if (iter.index >= offset + HPAGE_PMD_NR)
+				break;
+
+			p = radix_tree_deref_slot_protected(slot,
+					&mapping->tree_lock);
+			if (!p)
+				continue;
+
+			if (!radix_tree_exception(p)) {
+				error = -EEXIST;
+				break;
+			}
+
+			mapping->nrexceptional--;
+			rcu_assign_pointer(*slot, NULL);
+		}
+
+		if (!error)
+			error = __radix_tree_insert(&mapping->page_tree, offset,
+					compound_order(page), page);
+
+		if (!error) {
+			count_vm_event(THP_FILE_ALLOC);
+			mapping->nrpages += HPAGE_PMD_NR;
+			*shadowp = NULL;
+			__inc_node_page_state(page, NR_FILE_THPS);
+		}
+	} else {
+		error = page_cache_tree_insert(mapping, page, shadowp);
+	}
 	radix_tree_preload_end();
 	if (unlikely(error))
 		goto err_insert;
 
 	/* hugetlb pages do not participate in page cache accounting. */
-	if (!huge)
-		__inc_node_page_state(page, NR_FILE_PAGES);
+	if (!hugetlb)
+		__mod_node_page_state(page_pgdat(page), NR_FILE_PAGES,
+				hpage_nr_pages(page));
 	spin_unlock_irq(&mapping->tree_lock);
-	if (!huge)
+	if (!hugetlb)
 		mem_cgroup_commit_charge(page, memcg, false, false);
 	trace_mm_filemap_add_to_page_cache(page);
 	return 0;
@@ -680,7 +719,7 @@ err_insert:
 	page->mapping = NULL;
 	/* Leave page->index set: truncation relies upon it */
 	spin_unlock_irq(&mapping->tree_lock);
-	if (!huge)
+	if (!hugetlb)
 		mem_cgroup_cancel_charge(page, memcg, false);
 	put_page(page);
 	return error;
@@ -737,7 +776,7 @@ int add_to_page_cache_lru(struct page *page, struct address_space *mapping,
 EXPORT_SYMBOL_GPL(add_to_page_cache_lru);
 
 #ifdef CONFIG_NUMA
-struct page *__page_cache_alloc(gfp_t gfp)
+struct page *__page_cache_alloc_order(gfp_t gfp, unsigned int order)
 {
 	int n;
 	struct page *page;
@@ -747,14 +786,14 @@ struct page *__page_cache_alloc(gfp_t gfp)
 		do {
 			cpuset_mems_cookie = read_mems_allowed_begin();
 			n = cpuset_mem_spread_node();
-			page = __alloc_pages_node(n, gfp, 0);
+			page = __alloc_pages_node(n, gfp, order);
 		} while (!page && read_mems_allowed_retry(cpuset_mems_cookie));
 
 		return page;
 	}
-	return alloc_pages(gfp, 0);
+	return alloc_pages(gfp, order);
 }
-EXPORT_SYMBOL(__page_cache_alloc);
+EXPORT_SYMBOL(__page_cache_alloc_order);
 #endif
 
 /*
@@ -1149,6 +1188,69 @@ repeat:
 }
 EXPORT_SYMBOL(find_lock_entry);
 
+bool __page_cache_allow_huge(struct address_space *mapping, pgoff_t offset)
+{
+	struct inode *inode = mapping->host;
+	struct radix_tree_iter iter;
+	void **slot;
+	struct page *page;
+
+	if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGE_PAGECACHE))
+		return false;
+
+	offset = round_down(offset, HPAGE_PMD_NR);
+
+	switch (inode->i_flags & S_HUGE_MODE) {
+	case S_HUGE_NEVER:
+		return false;
+	case S_HUGE_ALWAYS:
+		break;
+	case S_HUGE_WITHIN_SIZE:
+		if (DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE) <
+				offset + HPAGE_PMD_NR)
+			return false;
+		break;
+	case S_HUGE_ADVISE:
+		/* TODO */
+		return false;
+	default:
+		WARN_ON_ONCE(1);
+		return false;
+	}
+
+	rcu_read_lock();
+	radix_tree_for_each_slot(slot, &mapping->page_tree, &iter, offset) {
+		if (iter.index >= offset + HPAGE_PMD_NR)
+			break;
+
+		/* Shadow entires are fine */
+		page = radix_tree_deref_slot(slot);
+		if (page && !radix_tree_exception(page)) {
+			rcu_read_unlock();
+			return false;
+		}
+	}
+	rcu_read_unlock();
+
+	return true;
+
+}
+
+static struct page *page_cache_alloc_huge(struct address_space *mapping,
+		pgoff_t offset, gfp_t gfp_mask)
+{
+	struct page *page;
+
+	if (!page_cache_allow_huge(mapping, offset))
+		return NULL;
+
+	gfp_mask |= __GFP_COMP | __GFP_NORETRY | __GFP_NOWARN;
+	page = __page_cache_alloc_order(gfp_mask, HPAGE_PMD_ORDER);
+	if (page)
+		prep_transhuge_page(page);
+	return page;
+}
+
 /**
  * pagecache_get_page - find and get a page reference
  * @mapping: the address_space to search
@@ -2022,19 +2124,37 @@ static int page_cache_read(struct file *file, pgoff_t offset, gfp_t gfp_mask)
 {
 	struct address_space *mapping = file->f_mapping;
 	struct page *page;
+	pgoff_t hoffset;
 	int ret;
 
 	do {
-		page = __page_cache_alloc(gfp_mask|__GFP_COLD);
+		page = page_cache_alloc_huge(mapping, offset, gfp_mask);
+no_huge:
+		if (!page)
+			page = __page_cache_alloc(gfp_mask|__GFP_COLD);
 		if (!page)
 			return -ENOMEM;
 
-		ret = add_to_page_cache_lru(page, mapping, offset, gfp_mask & GFP_KERNEL);
+		if (PageTransHuge(page))
+			hoffset = round_down(offset, HPAGE_PMD_NR);
+		else
+			hoffset = offset;
+
+		ret = add_to_page_cache_lru(page, mapping, hoffset,
+				gfp_mask & GFP_KERNEL);
 		if (ret == 0)
 			ret = mapping->a_ops->readpage(file, page);
 		else if (ret == -EEXIST)
 			ret = 0; /* losing race to add is OK */
 
+		if (ret && PageTransHuge(page)) {
+			delete_from_page_cache(page);
+			unlock_page(page);
+			put_page(page);
+			page = NULL;
+			goto no_huge;
+		}
+
 		put_page(page);
 
 	} while (ret == AOP_TRUNCATED_PAGE);
