diff --git a/include/linux/swap.h b/include/linux/swap.h
index a11c75e897ec..e88563978441 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -299,6 +299,7 @@ struct swap_info_struct {
 	signed char	type;		/* strange name for an index */
 	unsigned int	max;		/* extent of the swap_map */
 	unsigned char *swap_map;	/* vmalloc'ed array of usage counts */
+	unsigned long *zeromap;		/* vmalloc'ed bitmap to track zero pages */
 	struct swap_cluster_info *cluster_info; /* cluster info. Only for SSD */
 	struct swap_cluster_list free_clusters; /* free clusters list */
 	unsigned int lowest_bit;	/* index of first free in swap_map */
diff --git a/mm/page_io.c b/mm/page_io.c
index a360857cf75d..39fc3919ce15 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -172,6 +172,88 @@ int generic_swapfile_activate(struct swap_info_struct *sis,
 	goto out;
 }
 
+static bool is_folio_page_zero_filled(struct folio *folio, int i)
+{
+	unsigned long *data;
+	unsigned int pos, last_pos = PAGE_SIZE / sizeof(*data) - 1;
+	bool ret = false;
+
+	data = kmap_local_folio(folio, i * PAGE_SIZE);
+	if (data[last_pos])
+		goto out;
+	for (pos = 0; pos < PAGE_SIZE / sizeof(*data); pos++) {
+		if (data[pos])
+			goto out;
+	}
+	ret = true;
+out:
+	kunmap_local(data);
+	return ret;
+}
+
+static bool is_folio_zero_filled(struct folio *folio)
+{
+	unsigned int i;
+
+	for (i = 0; i < folio_nr_pages(folio); i++) {
+		if (!is_folio_page_zero_filled(folio, i))
+			return false;
+	}
+	return true;
+}
+
+static void folio_zero_fill(struct folio *folio)
+{
+	unsigned int i;
+
+	for (i = 0; i < folio_nr_pages(folio); i++)
+		clear_highpage(folio_page(folio, i));
+}
+
+static void swap_zeromap_folio_set(struct folio *folio)
+{
+	struct swap_info_struct *sis = swp_swap_info(folio->swap);
+	swp_entry_t entry;
+	unsigned int i;
+
+	for (i = 0; i < folio_nr_pages(folio); i++) {
+		entry = page_swap_entry(folio_page(folio, i));
+		set_bit(swp_offset(entry), sis->zeromap);
+	}
+}
+
+static void swap_zeromap_folio_clear(struct folio *folio)
+{
+	struct swap_info_struct *sis = swp_swap_info(folio->swap);
+	swp_entry_t entry;
+	unsigned int i;
+
+	for (i = 0; i < folio_nr_pages(folio); i++) {
+		entry = page_swap_entry(folio_page(folio, i));
+		clear_bit(swp_offset(entry), sis->zeromap);
+	}
+}
+
+/*
+ * Return the index of the first subpage which is not zero-filled
+ * according to swap_info_struct->zeromap.
+ * If all pages are zero-filled according to zeromap, it will return
+ * folio_nr_pages(folio).
+ */
+static unsigned int swap_zeromap_folio_test(struct folio *folio)
+{
+	struct swap_info_struct *sis = swp_swap_info(folio->swap);
+	swp_entry_t entry;
+	unsigned int i;
+
+	for (i = 0; i < folio_nr_pages(folio); i++) {
+		entry = page_swap_entry(folio_page(folio, i));
+		if (!test_bit(swp_offset(entry), sis->zeromap))
+			return i;
+	}
+	return i;
+}
+
 /*
  * We may have stale swap cache pages in memory: notice
  * them here and get rid of the unnecessary final write.
@@ -195,6 +277,13 @@ int swap_writepage(struct page *page, struct writeback_control *wbc)
 		folio_unlock(folio);
 		return ret;
 	}
+
+	if (is_folio_zero_filled(folio)) {
+		swap_zeromap_folio_set(folio);
+		folio_unlock(folio);
+		return 0;
+	}
+	swap_zeromap_folio_clear(folio);
 	if (zswap_store(folio)) {
 		folio_start_writeback(folio);
 		folio_unlock(folio);
@@ -426,6 +515,26 @@ static void sio_read_complete(struct kiocb *iocb, long ret)
 	mempool_free(sio, sio_pool);
 }
 
+static bool swap_read_folio_zeromap(struct folio *folio)
+{
+	unsigned int idx = swap_zeromap_folio_test(folio);
+
+	if (idx == 0)
+		return false;
+
+	/*
+	 * Swapping in a large folio that is partially in the zeromap is not
+	 * currently handled. Return true without marking the folio uptodate so
+	 * that an IO error is emitted (e.g. do_swap_page() will sigbus).
+	 */
+	if (WARN_ON_ONCE(idx < folio_nr_pages(folio)))
+		return true;
+
+	folio_zero_fill(folio);
+	folio_mark_uptodate(folio);
+	return true;
+}
+
 static void swap_read_folio_fs(struct folio *folio, struct swap_iocb **plug)
 {
 	struct swap_info_struct *sis = swp_swap_info(folio->swap);
@@ -515,8 +624,9 @@ void swap_read_folio(struct folio *folio, bool synchronous,
 		psi_memstall_enter(&pflags);
 	}
 	delayacct_swapin_start();
-
-	if (zswap_load(folio)) {
+	if (swap_read_folio_zeromap(folio)) {
+		folio_unlock(folio);
+	} else if (zswap_load(folio)) {
 		folio_mark_uptodate(folio);
 		folio_unlock(folio);
 	} else if (data_race(sis->flags & SWP_FS_OPS)) {
diff --git a/mm/swapfile.c b/mm/swapfile.c
index f1e559e216bd..48d8dca0b94b 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -453,6 +453,8 @@ static unsigned int cluster_list_del_first(struct swap_cluster_list *list,
 static void swap_cluster_schedule_discard(struct swap_info_struct *si,
 		unsigned int idx)
 {
+	unsigned int i;
+
 	/*
 	 * If scan_swap_map_slots() can't find a free cluster, it will check
 	 * si->swap_map directly. To make sure the discarding cluster isn't
@@ -461,6 +463,13 @@ static void swap_cluster_schedule_discard(struct swap_info_struct *si,
 	 */
 	memset(si->swap_map + idx * SWAPFILE_CLUSTER,
 			SWAP_MAP_BAD, SWAPFILE_CLUSTER);
+	/*
+	 * zeromap can see updates from concurrent swap_writepage() and swap_read_folio()
+	 * call on other slots, hence use atomic clear_bit for zeromap instead of the
+	 * non-atomic bitmap_clear.
+	 */
+	for (i = 0; i < SWAPFILE_CLUSTER; i++)
+		clear_bit(idx * SWAPFILE_CLUSTER + i, si->zeromap);
 
 	cluster_list_add_tail(&si->discard_clusters, si->cluster_info, idx);
 
@@ -482,7 +491,7 @@ static void __free_cluster(struct swap_info_struct *si, unsigned long idx)
 static void swap_do_scheduled_discard(struct swap_info_struct *si)
 {
 	struct swap_cluster_info *info, *ci;
-	unsigned int idx;
+	unsigned int idx, i;
 
 	info = si->cluster_info;
 
@@ -498,6 +507,8 @@ static void swap_do_scheduled_discard(struct swap_info_struct *si)
 		__free_cluster(si, idx);
 		memset(si->swap_map + idx * SWAPFILE_CLUSTER,
 				0, SWAPFILE_CLUSTER);
+		for (i = 0; i < SWAPFILE_CLUSTER; i++)
+			clear_bit(idx * SWAPFILE_CLUSTER + i, si->zeromap);
 		unlock_cluster(ci);
 	}
 }
@@ -1059,9 +1070,12 @@ static void swap_free_cluster(struct swap_info_struct *si, unsigned long idx)
 {
 	unsigned long offset = idx * SWAPFILE_CLUSTER;
 	struct swap_cluster_info *ci;
+	unsigned int i;
 
 	ci = lock_cluster(si, offset);
 	memset(si->swap_map + offset, 0, SWAPFILE_CLUSTER);
+	for (i = 0; i < SWAPFILE_CLUSTER; i++)
+		clear_bit(offset + i, si->zeromap);
 	cluster_set_count_flag(ci, 0, 0);
 	free_cluster(si, idx);
 	unlock_cluster(ci);
@@ -1336,6 +1350,7 @@ static void swap_entry_free(struct swap_info_struct *p, swp_entry_t entry)
 	count = p->swap_map[offset];
 	VM_BUG_ON(count != SWAP_HAS_CACHE);
 	p->swap_map[offset] = 0;
+	clear_bit(offset, p->zeromap);
 	dec_cluster_info_page(p, p->cluster_info, offset);
 	unlock_cluster(ci);
 
@@ -2597,6 +2612,7 @@ SYSCALL_DEFINE1(swapoff, const char __user *, specialfile)
 	free_percpu(p->cluster_next_cpu);
 	p->cluster_next_cpu = NULL;
 	vfree(swap_map);
+	bitmap_free(p->zeromap);
 	kvfree(cluster_info);
 	/* Destroy swap account information */
 	swap_cgroup_swapoff(p->type);
@@ -3123,6 +3139,12 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
 		goto bad_swap_unlock_inode;
 	}
 
+	p->zeromap = bitmap_zalloc(maxpages, GFP_KERNEL);
+	if (!p->zeromap) {
+		error = -ENOMEM;
+		goto bad_swap_unlock_inode;
+	}
+
 	if (p->bdev && bdev_stable_writes(p->bdev))
 		p->flags |= SWP_STABLE_WRITES;
 
