diff --git a/Documentation/mm/zblock.rst b/Documentation/mm/zblock.rst
new file mode 100644
index 000000000000..9751434d0b76
--- /dev/null
+++ b/Documentation/mm/zblock.rst
@@ -0,0 +1,24 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+======
+zblock
+======
+
+zblock is a special purpose allocator for storing compressed pages.
+It stores integer number of compressed objects per its block. These
+blocks consist of several physical pages (2**n, i. e. 1/2/4/8).
+
+With zblock, it is possible to densely arrange objects of various sizes
+resulting in low internal fragmentation. Also this allocator tries to
+fill incomplete blocks instead of adding new ones,  in many cases
+providing a compression ratio substantially higher than z3fold and zbud
+(though lower than zmalloc's).
+
+zblock does not require MMU to operate and also is superior to zsmalloc
+with regard to average performance and worst execution times, thus
+allowing for better response time and real-time characteristics of the
+whole system.
+
+E. g. on a series of stress-ng tests run on a Raspberry Pi 5, we get
+5-10% higher value for bogo ops/s in zblock/zsmalloc comparison.
+
diff --git a/MAINTAINERS b/MAINTAINERS
index 96b827049501..46465c986005 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -26640,6 +26640,13 @@ F:	Documentation/networking/device_drivers/hamradio/z8530drv.rst
 F:	drivers/net/hamradio/*scc.c
 F:	drivers/net/hamradio/z8530.h
 
+ZBLOCK COMPRESSED SLAB MEMORY ALLOCATOR
+M:	Vitaly Wool <vitaly.wool@konsulko.se>
+L:	linux-mm@kvack.org
+S:	Maintained
+F:	Documentation/mm/zblock.rst
+F:	mm/zblock.[ch]
+
 ZD1211RW WIRELESS DRIVER
 L:	linux-wireless@vger.kernel.org
 S:	Orphan
diff --git a/mm/Kconfig b/mm/Kconfig
index e113f713b493..5aa1479151ec 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -152,6 +152,18 @@ config ZSWAP_ZPOOL_DEFAULT
        default "zsmalloc" if ZSWAP_ZPOOL_DEFAULT_ZSMALLOC
        default ""
 
+config ZBLOCK
+	tristate "Fast compression allocator with high density"
+	depends on ZPOOL
+	help
+	  A special purpose allocator for storing compressed pages.
+	  It stores integer number of same size compressed objects per
+	  its block. These blocks consist of several physical pages
+	  (2**n, i. e. 1/2/4/8).
+
+	  With zblock, it is possible to densely arrange objects of
+	  various sizes resulting in low internal fragmentation.
+
 config ZSMALLOC
 	tristate
 	prompt "N:1 compression allocator (zsmalloc)" if (ZSWAP || ZRAM)
diff --git a/mm/Makefile b/mm/Makefile
index e7f6bbf8ae5f..9d7e5b5bb694 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -116,6 +116,7 @@ obj-$(CONFIG_DEBUG_VM_PGTABLE) += debug_vm_pgtable.o
 obj-$(CONFIG_PAGE_OWNER) += page_owner.o
 obj-$(CONFIG_MEMORY_ISOLATION) += page_isolation.o
 obj-$(CONFIG_ZPOOL)	+= zpool.o
+obj-$(CONFIG_ZBLOCK)	+= zblock.o
 obj-$(CONFIG_ZSMALLOC)	+= zsmalloc.o
 obj-$(CONFIG_GENERIC_EARLY_IOREMAP) += early_ioremap.o
 obj-$(CONFIG_CMA)	+= cma.o
diff --git a/mm/zblock.c b/mm/zblock.c
new file mode 100644
index 000000000000..ecc7aeb611af
--- /dev/null
+++ b/mm/zblock.c
@@ -0,0 +1,443 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * zblock.c
+ *
+ * Author: Vitaly Wool <vitaly.wool@konsulko.se>
+ * Based on the work from Ananda Badmaev <a.badmaev@clicknet.pro>
+ * Copyright (C) 2022-2025, Konsulko AB.
+ *
+ * Zblock is a small object allocator with the intention to serve as a
+ * zpool backend. It operates on page blocks which consist of number
+ * of physical pages being a power of 2 and store integer number of
+ * compressed pages per block which results in determinism and simplicity.
+ *
+ * zblock doesn't export any API and is meant to be used via zpool API.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/atomic.h>
+#include <linux/list.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/preempt.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/zpool.h>
+#include "zblock.h"
+
+static struct rb_root block_desc_tree = RB_ROOT;
+
+/* Encode handle of a particular slot in the pool using metadata */
+static inline unsigned long metadata_to_handle(struct zblock_block *block,
+				unsigned int block_type, unsigned int slot)
+{
+	return (unsigned long)(block) | (block_type << SLOT_BITS) | slot;
+}
+
+/* Return block, block type and slot in the pool corresponding to handle */
+static inline struct zblock_block *handle_to_metadata(unsigned long handle,
+				unsigned int *block_type, unsigned int *slot)
+{
+	*block_type = (handle & (PAGE_SIZE - 1)) >> SLOT_BITS;
+	*slot = handle & SLOT_MASK;
+	return (struct zblock_block *)(handle & PAGE_MASK);
+}
+
+/*
+ * Find a block with at least one free slot and claim it.
+ * We make sure that the first block, if exists, will always work.
+ */
+static inline struct zblock_block *find_and_claim_block(struct block_list *b,
+		int block_type, unsigned long *handle)
+{
+	struct list_head *l = &b->active_list;
+	unsigned int slot;
+
+	if (!list_empty(l)) {
+		struct zblock_block *z = list_first_entry(l, typeof(*z), link);
+
+		if (--z->free_slots == 0)
+			list_move(&z->link, &b->full_list);
+		/*
+		 * There is a slot in the block and we just made sure it would
+		 * remain.
+		 * Find that slot and set the busy bit.
+		 */
+		for (slot = find_first_zero_bit(z->slot_info,
+					block_desc[block_type].slots_per_block);
+		     slot < block_desc[block_type].slots_per_block;
+		     slot = find_next_zero_bit(z->slot_info,
+					block_desc[block_type].slots_per_block,
+					slot)) {
+			if (!test_and_set_bit(slot, z->slot_info))
+				break;
+			barrier();
+		}
+
+		WARN_ON(slot >= block_desc[block_type].slots_per_block);
+		*handle = metadata_to_handle(z, block_type, slot);
+		return z;
+	}
+	return NULL;
+}
+
+/*
+ * allocate new block and add it to corresponding block list
+ */
+static struct zblock_block *alloc_block(struct zblock_pool *pool,
+					int block_type, gfp_t gfp,
+					unsigned long *handle)
+{
+	struct zblock_block *block;
+	struct block_list *block_list;
+
+	block = (void *)__get_free_pages(gfp, block_desc[block_type].order);
+	if (!block)
+		return NULL;
+
+	block_list = &pool->block_lists[block_type];
+
+	/* init block data  */
+	block->free_slots = block_desc[block_type].slots_per_block - 1;
+	memset(&block->slot_info, 0, sizeof(block->slot_info));
+	set_bit(0, block->slot_info);
+	*handle = metadata_to_handle(block, block_type, 0);
+
+	spin_lock(&block_list->lock);
+	list_add(&block->link, &block_list->active_list);
+	block_list->block_count++;
+	spin_unlock(&block_list->lock);
+	return block;
+}
+
+/*****************
+ * API Functions
+ *****************/
+/**
+ * zblock_create_pool() - create a new zblock pool
+ * @gfp:	gfp flags when allocating the zblock pool structure
+ * @ops:	user-defined operations for the zblock pool
+ *
+ * Return: pointer to the new zblock pool or NULL if the metadata allocation
+ * failed.
+ */
+static struct zblock_pool *zblock_create_pool(gfp_t gfp)
+{
+	struct zblock_pool *pool;
+	struct block_list *block_list;
+	int i;
+
+	pool = kmalloc(sizeof(struct zblock_pool), gfp);
+	if (!pool)
+		return NULL;
+
+	/* init each block list */
+	for (i = 0; i < ARRAY_SIZE(block_desc); i++) {
+		block_list = &pool->block_lists[i];
+		spin_lock_init(&block_list->lock);
+		INIT_LIST_HEAD(&block_list->full_list);
+		INIT_LIST_HEAD(&block_list->active_list);
+		block_list->block_count = 0;
+	}
+	return pool;
+}
+
+/**
+ * zblock_destroy_pool() - destroys an existing zblock pool
+ * @pool:	the zblock pool to be destroyed
+ *
+ */
+static void zblock_destroy_pool(struct zblock_pool *pool)
+{
+	kfree(pool);
+}
+
+
+/**
+ * zblock_alloc() - allocates a slot of appropriate size
+ * @pool:	zblock pool from which to allocate
+ * @size:	size in bytes of the desired allocation
+ * @gfp:	gfp flags used if the pool needs to grow
+ * @handle:	handle of the new allocation
+ *
+ * Return: 0 if success and handle is set, otherwise -EINVAL if the size or
+ * gfp arguments are invalid or -ENOMEM if the pool was unable to allocate
+ * a new slot.
+ */
+static int zblock_alloc(struct zblock_pool *pool, size_t size, gfp_t gfp,
+			unsigned long *handle)
+{
+	int block_type = -1;
+	struct zblock_block *block;
+	struct block_list *block_list;
+
+	if (!size)
+		return -EINVAL;
+
+	if (size > PAGE_SIZE)
+		return -ENOSPC;
+
+	/* find basic block type with suitable slot size */
+	if (size < block_desc[0].slot_size)
+		block_type = 0;
+	else {
+		struct block_desc_node *block_node;
+		struct rb_node *node = block_desc_tree.rb_node;
+
+		while (node) {
+			block_node = container_of(node, typeof(*block_node), node);
+			if (size < block_node->this_slot_size)
+				node = node->rb_left;
+			else if (size >= block_node->next_slot_size)
+				node = node->rb_right;
+			else {
+				block_type = block_node->block_idx + 1;
+				break;
+			}
+		}
+	}
+	if (WARN_ON(block_type < 0))
+		return -EINVAL;
+	if (block_type >= ARRAY_SIZE(block_desc))
+		return -ENOSPC;
+
+	block_list = &pool->block_lists[block_type];
+
+	spin_lock(&block_list->lock);
+	block = find_and_claim_block(block_list, block_type, handle);
+	spin_unlock(&block_list->lock);
+	if (block)
+		return 0;
+
+	/* not found block with free slots try to allocate new empty block */
+	block = alloc_block(pool, block_type, gfp & ~(__GFP_MOVABLE | __GFP_HIGHMEM), handle);
+	return block ? 0 : -ENOMEM;
+}
+
+/**
+ * zblock_free() - frees the allocation associated with the given handle
+ * @pool:	pool in which the allocation resided
+ * @handle:	handle associated with the allocation returned by zblock_alloc()
+ *
+ */
+static void zblock_free(struct zblock_pool *pool, unsigned long handle)
+{
+	unsigned int slot, block_type;
+	struct zblock_block *block;
+	struct block_list *block_list;
+
+	block = handle_to_metadata(handle, &block_type, &slot);
+	block_list = &pool->block_lists[block_type];
+
+	spin_lock(&block_list->lock);
+	/* if all slots in block are empty delete whole block */
+	if (++block->free_slots == block_desc[block_type].slots_per_block) {
+		block_list->block_count--;
+		list_del(&block->link);
+		spin_unlock(&block_list->lock);
+		free_pages((unsigned long)block, block_desc[block_type].order);
+		return;
+	} else if (block->free_slots == 1)
+		list_move_tail(&block->link, &block_list->active_list);
+	clear_bit(slot, block->slot_info);
+	spin_unlock(&block_list->lock);
+}
+
+/**
+ * zblock_map() - maps the allocation associated with the given handle
+ * @pool:	pool in which the allocation resides
+ * @handle:	handle associated with the allocation to be mapped
+ *
+ *
+ * Returns: a pointer to the mapped allocation
+ */
+static void *zblock_map(struct zblock_pool *pool, unsigned long handle)
+{
+	unsigned int block_type, slot;
+	struct zblock_block *block;
+	unsigned long offs;
+	void *p;
+
+	block = handle_to_metadata(handle, &block_type, &slot);
+	offs = ZBLOCK_HEADER_SIZE + slot * block_desc[block_type].slot_size;
+	p = (void *)block + offs;
+	return p;
+}
+
+/**
+ * zblock_unmap() - unmaps the allocation associated with the given handle
+ * @pool:	pool in which the allocation resides
+ * @handle:	handle associated with the allocation to be unmapped
+ */
+static void zblock_unmap(struct zblock_pool *pool, unsigned long handle)
+{
+}
+
+/**
+ * zblock_write() - write to the memory area defined by handle
+ * @pool:	pool in which the allocation resides
+ * @handle:	handle associated with the allocation
+ * @handle_mem: pointer to source memory block
+ * @mem_len:	length of the memory block to write
+ */
+static void zblock_write(struct zblock_pool *pool, unsigned long handle,
+			 void *handle_mem, size_t mem_len)
+{
+	unsigned int block_type, slot;
+	struct zblock_block *block;
+	unsigned long offs;
+	void *p;
+
+	block = handle_to_metadata(handle, &block_type, &slot);
+	offs = ZBLOCK_HEADER_SIZE + slot * block_desc[block_type].slot_size;
+	p = (void *)block + offs;
+	memcpy(p, handle_mem, mem_len);
+}
+
+/**
+ * zblock_get_total_pages() - gets the zblock pool size in pages
+ * @pool:	pool being queried
+ *
+ * Returns: size in bytes of the given pool.
+ */
+static u64 zblock_get_total_pages(struct zblock_pool *pool)
+{
+	u64 total_size;
+	int i;
+
+	total_size = 0;
+	for (i = 0; i < ARRAY_SIZE(block_desc); i++)
+		total_size += pool->block_lists[i].block_count << block_desc[i].order;
+
+	return total_size;
+}
+
+/*****************
+ * zpool
+ ****************/
+
+static void *zblock_zpool_create(const char *name, gfp_t gfp)
+{
+	return zblock_create_pool(gfp);
+}
+
+static void zblock_zpool_destroy(void *pool)
+{
+	zblock_destroy_pool(pool);
+}
+
+static int zblock_zpool_malloc(void *pool, size_t size, gfp_t gfp,
+			unsigned long *handle)
+{
+	return zblock_alloc(pool, size, gfp, handle);
+}
+
+static void zblock_zpool_free(void *pool, unsigned long handle)
+{
+	zblock_free(pool, handle);
+}
+
+static void *zblock_zpool_read_begin(void *pool, unsigned long handle,
+				void *local_copy)
+{
+	return zblock_map(pool, handle);
+}
+
+static void zblock_zpool_obj_write(void *pool, unsigned long handle,
+				void *handle_mem, size_t mem_len)
+{
+	zblock_write(pool, handle, handle_mem, mem_len);
+}
+
+static void zblock_zpool_read_end(void *pool, unsigned long handle,
+				void *handle_mem)
+{
+	zblock_unmap(pool, handle);
+}
+
+static u64 zblock_zpool_total_pages(void *pool)
+{
+	return zblock_get_total_pages(pool);
+}
+
+static struct zpool_driver zblock_zpool_driver = {
+	.type =			"zblock",
+	.owner =		THIS_MODULE,
+	.create =		zblock_zpool_create,
+	.destroy =		zblock_zpool_destroy,
+	.malloc =		zblock_zpool_malloc,
+	.free =			zblock_zpool_free,
+	.obj_read_begin =	zblock_zpool_read_begin,
+	.obj_read_end =		zblock_zpool_read_end,
+	.obj_write =		zblock_zpool_obj_write,
+	.total_pages =		zblock_zpool_total_pages,
+};
+
+MODULE_ALIAS("zpool-zblock");
+
+static void delete_rbtree(void)
+{
+	while (!RB_EMPTY_ROOT(&block_desc_tree))
+		rb_erase(block_desc_tree.rb_node, &block_desc_tree);
+}
+
+static int __init create_rbtree(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(block_desc); i++) {
+		struct block_desc_node *block_node = kmalloc(sizeof(*block_node),
+							GFP_KERNEL);
+		struct rb_node **new = &block_desc_tree.rb_node, *parent = NULL;
+
+		if (!block_node) {
+			delete_rbtree();
+			return -ENOMEM;
+		}
+		if (i > 0 && block_desc[i].slot_size <= block_desc[i-1].slot_size) {
+			pr_err("%s: block descriptors not in ascending order\n",
+				__func__);
+			delete_rbtree();
+			return -EINVAL;
+		}
+		block_node->this_slot_size = block_desc[i].slot_size;
+		block_node->block_idx = i;
+		if (i == ARRAY_SIZE(block_desc) - 1)
+			block_node->next_slot_size = PAGE_SIZE;
+		else
+			block_node->next_slot_size = block_desc[i+1].slot_size;
+		while (*new) {
+			parent = *new;
+			/* the array is sorted so we will always go to the right */
+			new = &((*new)->rb_right);
+		}
+		rb_link_node(&block_node->node, parent, new);
+		rb_insert_color(&block_node->node, &block_desc_tree);
+	}
+	return 0;
+}
+
+static int __init init_zblock(void)
+{
+	int ret = create_rbtree();
+
+	if (ret)
+		return ret;
+
+	zpool_register_driver(&zblock_zpool_driver);
+	return 0;
+}
+
+static void __exit exit_zblock(void)
+{
+	zpool_unregister_driver(&zblock_zpool_driver);
+	delete_rbtree();
+}
+
+module_init(init_zblock);
+module_exit(exit_zblock);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Vitaly Wool <vitaly.wool@konsulko.se>");
+MODULE_DESCRIPTION("Block allocator for compressed pages");
diff --git a/mm/zblock.h b/mm/zblock.h
new file mode 100644
index 000000000000..fd72961c077a
--- /dev/null
+++ b/mm/zblock.h
@@ -0,0 +1,176 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Author: Vitaly Wool <vitaly.wool@konsulko.com>
+ * Copyright (C) 2025, Konsulko AB.
+ */
+#ifndef __ZBLOCK_H__
+#define __ZBLOCK_H__
+
+#include <linux/mm.h>
+#include <linux/rbtree.h>
+#include <linux/types.h>
+
+#define SLOT_FREE 0
+#define BIT_SLOT_OCCUPIED 0
+#define BIT_SLOT_MAPPED 1
+
+#if PAGE_SIZE == 0x1000
+/* max 128 slots per block, max table size 32 */
+#define SLOT_BITS 7
+#elif PAGE_SIZE == 0x4000
+/* max 256 slots per block, max table size 64 */
+#define SLOT_BITS 8
+#else
+#error Unsupported PAGE_SIZE
+#endif
+
+#define MAX_SLOTS (1 << SLOT_BITS)
+#define SLOT_MASK ((0x1UL << SLOT_BITS) - 1)
+
+#define ZBLOCK_HEADER_SIZE	round_up(sizeof(struct zblock_block), sizeof(long))
+#define BLOCK_DATA_SIZE(order) ((PAGE_SIZE << order) - ZBLOCK_HEADER_SIZE)
+#define SLOT_SIZE(nslots, order) (round_down((BLOCK_DATA_SIZE(order) / nslots), sizeof(long)))
+
+/**
+ * struct zblock_block - block metadata
+ * Block consists of several (1/2/4/8) pages and contains fixed
+ * integer number of slots for allocating compressed pages.
+ *
+ * free_slots:	number of free slots in the block
+ * slot_info:	contains data about free/occupied slots
+ */
+struct zblock_block {
+	struct list_head link;
+	DECLARE_BITMAP(slot_info, 1 << SLOT_BITS);
+	u32 free_slots;
+};
+
+/**
+ * struct block_desc - general metadata for block lists
+ * Each block list stores only blocks of corresponding type which means
+ * that all blocks in it have the same number and size of slots.
+ * All slots are aligned to size of long.
+ *
+ * slot_size:		size of slot for this list
+ * slots_per_block:	number of slots per block for this list
+ * order:		order for __get_free_pages
+ */
+struct block_desc {
+	unsigned int slot_size;
+	unsigned short slots_per_block;
+	unsigned short order;
+};
+
+struct block_desc_node {
+	struct rb_node node;
+	unsigned int this_slot_size;
+	unsigned int next_slot_size;
+	unsigned int block_idx;
+};
+
+static const struct block_desc block_desc[] = {
+#if PAGE_SIZE == 0x1000
+	{ SLOT_SIZE(63, 0), 63, 0 },
+	{ SLOT_SIZE(32, 0), 32, 0 },
+	{ SLOT_SIZE(21, 0), 21, 0 },
+	{ SLOT_SIZE(15, 0), 15, 0 },
+	{ SLOT_SIZE(12, 0), 12, 0 },
+	{ SLOT_SIZE(10, 0), 10, 0 },
+	{ SLOT_SIZE(9, 0), 9, 0 },
+	{ SLOT_SIZE(8, 0), 8, 0 },
+	{ SLOT_SIZE(29, 2), 29, 2 },
+	{ SLOT_SIZE(13, 1), 13, 1 },
+	{ SLOT_SIZE(6, 0), 6, 0 },
+	{ SLOT_SIZE(11, 1), 11, 1 },
+	{ SLOT_SIZE(5, 0), 5, 0 },
+	{ SLOT_SIZE(9, 1), 9, 1 },
+	{ SLOT_SIZE(8, 1), 8, 1 },
+	{ SLOT_SIZE(29, 3), 29, 3 },
+	{ SLOT_SIZE(13, 2), 13, 2 },
+	{ SLOT_SIZE(12, 2), 12, 2 },
+	{ SLOT_SIZE(11, 2), 11, 2 },
+	{ SLOT_SIZE(10, 2), 10, 2 },
+	{ SLOT_SIZE(9, 2), 9, 2 },
+	{ SLOT_SIZE(17, 3), 17, 3 },
+	{ SLOT_SIZE(8, 2), 8, 2 },
+	{ SLOT_SIZE(15, 3), 15, 3 },
+	{ SLOT_SIZE(14, 3), 14, 3 },
+	{ SLOT_SIZE(13, 3), 13, 3 },
+	{ SLOT_SIZE(6, 2), 6, 2 },
+	{ SLOT_SIZE(11, 3), 11, 3 },
+	{ SLOT_SIZE(10, 3), 10, 3 },
+	{ SLOT_SIZE(9, 3), 9, 3 },
+	{ SLOT_SIZE(4, 2), 4, 2 },
+#elif PAGE_SIZE == 0x4000
+	{ SLOT_SIZE(255, 0), 255, 0 },
+	{ SLOT_SIZE(185, 0), 185, 0 },
+	{ SLOT_SIZE(145, 0), 145, 0 },
+	{ SLOT_SIZE(113, 0), 113, 0 },
+	{ SLOT_SIZE(92, 0), 92, 0 },
+	{ SLOT_SIZE(75, 0), 75, 0 },
+	{ SLOT_SIZE(60, 0), 60, 0 },
+	{ SLOT_SIZE(51, 0), 51, 0 },
+	{ SLOT_SIZE(43, 0), 43, 0 },
+	{ SLOT_SIZE(37, 0), 37, 0 },
+	{ SLOT_SIZE(32, 0), 32, 0 },
+	{ SLOT_SIZE(27, 0), 27, 0 },
+	{ SLOT_SIZE(23, 0), 23, 0 },
+	{ SLOT_SIZE(19, 0), 19, 0 },
+	{ SLOT_SIZE(17, 0), 17, 0 },
+	{ SLOT_SIZE(15, 0), 15, 0 },
+	{ SLOT_SIZE(13, 0), 13, 0 },
+	{ SLOT_SIZE(11, 0), 11, 0 },
+	{ SLOT_SIZE(10, 0), 10, 0 },
+	{ SLOT_SIZE(9, 0), 9, 0 },
+	{ SLOT_SIZE(8, 0), 8, 0 },
+	{ SLOT_SIZE(15, 1), 15, 1 },
+	{ SLOT_SIZE(14, 1), 14, 1 },
+	{ SLOT_SIZE(13, 1), 13, 1 },
+	{ SLOT_SIZE(12, 1), 12, 1 },
+	{ SLOT_SIZE(11, 1), 11, 1 },
+	{ SLOT_SIZE(10, 1), 10, 1 },
+	{ SLOT_SIZE(9, 1), 9, 1 },
+	{ SLOT_SIZE(8, 1), 8, 1 },
+	{ SLOT_SIZE(15, 2), 15, 2 },
+	{ SLOT_SIZE(14, 2), 14, 2 },
+	{ SLOT_SIZE(13, 2), 13, 2 },
+	{ SLOT_SIZE(12, 2), 12, 2 },
+	{ SLOT_SIZE(11, 2), 11, 2 },
+	{ SLOT_SIZE(10, 2), 10, 2 },
+	{ SLOT_SIZE(9, 2), 9, 2 },
+	{ SLOT_SIZE(8, 2), 8, 2 },
+	{ SLOT_SIZE(7, 2), 7, 2 },
+	{ SLOT_SIZE(6, 2), 6, 2 },
+	{ SLOT_SIZE(5, 2), 5, 2 },
+#endif /* PAGE_SIZE */
+};
+
+/**
+ * struct block_list - stores metadata of particular list
+ * lock:		protects the list of blocks
+ * active_list:		linked list of active (non-full) blocks
+ * full_list:		linked list of full blocks
+ * block_count:		total number of blocks in the list
+ */
+struct block_list {
+	spinlock_t lock;
+	struct list_head active_list;
+	struct list_head full_list;
+	unsigned long block_count;
+};
+
+/**
+ * struct zblock_pool - stores metadata for each zblock pool
+ * @block_lists:	array of block lists
+ * @zpool:		zpool driver
+ *
+ * This structure is allocated at pool creation time and maintains metadata
+ * for a particular zblock pool.
+ */
+struct zblock_pool {
+	struct block_list block_lists[ARRAY_SIZE(block_desc)];
+	struct zpool *zpool;
+};
+
+
+#endif
