diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 0abe694..cc34d88 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -248,7 +248,11 @@
 				goto next;
 			}
 			get_node_info(sbi, dn.nid, &ni);
-			f2fs_replace_block(sbi, &dn, dn.data_blkaddr,
+			if (cur->old_addr == NEW_ADDR) {
+				invalidate_blocks(sbi, dn.data_blkaddr);
+				f2fs_update_data_blkaddr(&dn, NEW_ADDR);
+			} else
+				f2fs_replace_block(sbi, &dn, dn.data_blkaddr,
 					cur->old_addr, ni.version, true, true);
 			f2fs_put_dnode(&dn);
 		}
@@ -657,7 +661,7 @@
 		goto init_thread;
 	}
 
-	fcc = kzalloc(sizeof(struct flush_cmd_control), GFP_KERNEL);
+	fcc = f2fs_kzalloc(sbi, sizeof(struct flush_cmd_control), GFP_KERNEL);
 	if (!fcc)
 		return -ENOMEM;
 	atomic_set(&fcc->issued_flush, 0);
@@ -884,7 +888,7 @@
 	bio_put(bio);
 }
 
-void __check_sit_bitmap(struct f2fs_sb_info *sbi,
+static void __check_sit_bitmap(struct f2fs_sb_info *sbi,
 				block_t start, block_t end)
 {
 #ifdef CONFIG_F2FS_CHECK_FS
@@ -1204,6 +1208,8 @@
 		pend_list = &dcc->pend_list[i];
 
 		mutex_lock(&dcc->cmd_lock);
+		if (list_empty(pend_list))
+			goto next;
 		f2fs_bug_on(sbi, !__check_rb_tree_consistence(sbi, &dcc->root));
 		blk_start_plug(&plug);
 		list_for_each_entry_safe(dc, tmp, pend_list, list) {
@@ -1222,6 +1228,7 @@
 				break;
 		}
 		blk_finish_plug(&plug);
+next:
 		mutex_unlock(&dcc->cmd_lock);
 
 		if (iter >= dpolicy->max_requests)
@@ -1256,6 +1263,11 @@
 	return dropped;
 }
 
+void drop_discard_cmd(struct f2fs_sb_info *sbi)
+{
+	__drop_discard_cmd(sbi);
+}
+
 static unsigned int __wait_one_discard_bio(struct f2fs_sb_info *sbi,
 							struct discard_cmd *dc)
 {
@@ -1324,7 +1336,7 @@
 }
 
 /* This should be covered by global mutex, &sit_i->sentry_lock */
-void f2fs_wait_discard_bio(struct f2fs_sb_info *sbi, block_t blkaddr)
+static void f2fs_wait_discard_bio(struct f2fs_sb_info *sbi, block_t blkaddr)
 {
 	struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
 	struct discard_cmd *dc;
@@ -1394,6 +1406,8 @@
 				msecs_to_jiffies(wait_ms));
 		if (try_to_freeze())
 			continue;
+		if (f2fs_readonly(sbi->sb))
+			continue;
 		if (kthread_should_stop())
 			return 0;
 
@@ -1703,25 +1717,20 @@
 	dpolicy->sync = true;
 	dpolicy->granularity = granularity;
 
+	dpolicy->max_requests = DEF_MAX_DISCARD_REQUEST;
+	dpolicy->io_aware_gran = MAX_PLIST_NUM;
+
 	if (discard_type == DPOLICY_BG) {
 		dpolicy->min_interval = DEF_MIN_DISCARD_ISSUE_TIME;
 		dpolicy->max_interval = DEF_MAX_DISCARD_ISSUE_TIME;
-		dpolicy->max_requests = DEF_MAX_DISCARD_REQUEST;
-		dpolicy->io_aware_gran = MAX_PLIST_NUM;
 		dpolicy->io_aware = true;
 	} else if (discard_type == DPOLICY_FORCE) {
 		dpolicy->min_interval = DEF_MIN_DISCARD_ISSUE_TIME;
 		dpolicy->max_interval = DEF_MAX_DISCARD_ISSUE_TIME;
-		dpolicy->max_requests = DEF_MAX_DISCARD_REQUEST;
-		dpolicy->io_aware_gran = MAX_PLIST_NUM;
 		dpolicy->io_aware = true;
 	} else if (discard_type == DPOLICY_FSTRIM) {
-		dpolicy->max_requests = DEF_MAX_DISCARD_REQUEST;
-		dpolicy->io_aware_gran = MAX_PLIST_NUM;
 		dpolicy->io_aware = false;
 	} else if (discard_type == DPOLICY_UMOUNT) {
-		dpolicy->max_requests = DEF_MAX_DISCARD_REQUEST;
-		dpolicy->io_aware_gran = MAX_PLIST_NUM;
 		dpolicy->io_aware = false;
 	}
 }
@@ -1737,7 +1746,7 @@
 		goto init_thread;
 	}
 
-	dcc = kzalloc(sizeof(struct discard_cmd_control), GFP_KERNEL);
+	dcc = f2fs_kzalloc(sbi, sizeof(struct discard_cmd_control), GFP_KERNEL);
 	if (!dcc)
 		return -ENOMEM;
 
@@ -2434,7 +2443,6 @@
 	return false;
 }
 
-#if 0
 int rw_hint_to_seg_type(enum rw_hint hint)
 {
 	switch (hint) {
@@ -2446,7 +2454,6 @@
 		return CURSEG_WARM_DATA;
 	}
 }
-#endif
 
 static int __get_segment_type_2(struct f2fs_io_info *fio)
 {
@@ -2742,6 +2749,7 @@
 		}
 	}
 
+	f2fs_bug_on(sbi, !IS_DATASEG(type));
 	curseg = CURSEG_I(sbi, type);
 
 	mutex_lock(&curseg->curseg_mutex);
@@ -2826,7 +2834,7 @@
 	}
 }
 
-static int read_compacted_summaries(struct f2fs_sb_info *sbi)
+static void read_compacted_summaries(struct f2fs_sb_info *sbi)
 {
 	struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
 	struct curseg_info *seg_i;
@@ -2883,7 +2891,6 @@
 		}
 	}
 	f2fs_put_page(page, 1);
-	return 0;
 }
 
 static int read_normal_summaries(struct f2fs_sb_info *sbi, int type)
@@ -2929,13 +2936,7 @@
 				ns->ofs_in_node = 0;
 			}
 		} else {
-			int err;
-
-			err = restore_node_summary(sbi, segno, sum);
-			if (err) {
-				f2fs_put_page(new, 1);
-				return err;
-			}
+			restore_node_summary(sbi, segno, sum);
 		}
 	}
 
@@ -2974,8 +2975,7 @@
 							META_CP, true);
 
 		/* restore for compacted data summary */
-		if (read_compacted_summaries(sbi))
-			return -EINVAL;
+		read_compacted_summaries(sbi);
 		type = CURSEG_HOT_NODE;
 	}
 
@@ -3111,28 +3111,19 @@
 					unsigned int start)
 {
 	struct sit_info *sit_i = SIT_I(sbi);
-	struct page *src_page, *dst_page;
+	struct page *page;
 	pgoff_t src_off, dst_off;
-	void *src_addr, *dst_addr;
 
 	src_off = current_sit_addr(sbi, start);
 	dst_off = next_sit_addr(sbi, src_off);
 
-	/* get current sit block page without lock */
-	src_page = get_meta_page(sbi, src_off);
-	dst_page = grab_meta_page(sbi, dst_off);
-	f2fs_bug_on(sbi, PageDirty(src_page));
+	page = grab_meta_page(sbi, dst_off);
+	seg_info_to_sit_page(sbi, page, start);
 
-	src_addr = page_address(src_page);
-	dst_addr = page_address(dst_page);
-	memcpy(dst_addr, src_addr, PAGE_SIZE);
-
-	set_page_dirty(dst_page);
-	f2fs_put_page(src_page, 1);
-
+	set_page_dirty(page);
 	set_to_next_sit(sit_i, start);
 
-	return dst_page;
+	return page;
 }
 
 static struct sit_entry_set *grab_sit_entry_set(void)
@@ -3341,52 +3332,54 @@
 	unsigned int bitmap_size;
 
 	/* allocate memory for SIT information */
-	sit_i = kzalloc(sizeof(struct sit_info), GFP_KERNEL);
+	sit_i = f2fs_kzalloc(sbi, sizeof(struct sit_info), GFP_KERNEL);
 	if (!sit_i)
 		return -ENOMEM;
 
 	SM_I(sbi)->sit_info = sit_i;
 
-	sit_i->sentries = kvzalloc(MAIN_SEGS(sbi) *
+	sit_i->sentries = f2fs_kvzalloc(sbi, MAIN_SEGS(sbi) *
 					sizeof(struct seg_entry), GFP_KERNEL);
 	if (!sit_i->sentries)
 		return -ENOMEM;
 
 	bitmap_size = f2fs_bitmap_size(MAIN_SEGS(sbi));
-	sit_i->dirty_sentries_bitmap = kvzalloc(bitmap_size, GFP_KERNEL);
+	sit_i->dirty_sentries_bitmap = f2fs_kvzalloc(sbi, bitmap_size,
+								GFP_KERNEL);
 	if (!sit_i->dirty_sentries_bitmap)
 		return -ENOMEM;
 
 	for (start = 0; start < MAIN_SEGS(sbi); start++) {
 		sit_i->sentries[start].cur_valid_map
-			= kzalloc(SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);
+			= f2fs_kzalloc(sbi, SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);
 		sit_i->sentries[start].ckpt_valid_map
-			= kzalloc(SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);
+			= f2fs_kzalloc(sbi, SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);
 		if (!sit_i->sentries[start].cur_valid_map ||
 				!sit_i->sentries[start].ckpt_valid_map)
 			return -ENOMEM;
 
 #ifdef CONFIG_F2FS_CHECK_FS
 		sit_i->sentries[start].cur_valid_map_mir
-			= kzalloc(SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);
+			= f2fs_kzalloc(sbi, SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);
 		if (!sit_i->sentries[start].cur_valid_map_mir)
 			return -ENOMEM;
 #endif
 
 		if (f2fs_discard_en(sbi)) {
 			sit_i->sentries[start].discard_map
-				= kzalloc(SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);
+				= f2fs_kzalloc(sbi, SIT_VBLOCK_MAP_SIZE,
+								GFP_KERNEL);
 			if (!sit_i->sentries[start].discard_map)
 				return -ENOMEM;
 		}
 	}
 
-	sit_i->tmp_map = kzalloc(SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);
+	sit_i->tmp_map = f2fs_kzalloc(sbi, SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);
 	if (!sit_i->tmp_map)
 		return -ENOMEM;
 
 	if (sbi->segs_per_sec > 1) {
-		sit_i->sec_entries = kvzalloc(MAIN_SECS(sbi) *
+		sit_i->sec_entries = f2fs_kvzalloc(sbi, MAIN_SECS(sbi) *
 					sizeof(struct sec_entry), GFP_KERNEL);
 		if (!sit_i->sec_entries)
 			return -ENOMEM;
@@ -3430,19 +3423,19 @@
 	unsigned int bitmap_size, sec_bitmap_size;
 
 	/* allocate memory for free segmap information */
-	free_i = kzalloc(sizeof(struct free_segmap_info), GFP_KERNEL);
+	free_i = f2fs_kzalloc(sbi, sizeof(struct free_segmap_info), GFP_KERNEL);
 	if (!free_i)
 		return -ENOMEM;
 
 	SM_I(sbi)->free_info = free_i;
 
 	bitmap_size = f2fs_bitmap_size(MAIN_SEGS(sbi));
-	free_i->free_segmap = kvmalloc(bitmap_size, GFP_KERNEL);
+	free_i->free_segmap = f2fs_kvmalloc(sbi, bitmap_size, GFP_KERNEL);
 	if (!free_i->free_segmap)
 		return -ENOMEM;
 
 	sec_bitmap_size = f2fs_bitmap_size(MAIN_SECS(sbi));
-	free_i->free_secmap = kvmalloc(sec_bitmap_size, GFP_KERNEL);
+	free_i->free_secmap = f2fs_kvmalloc(sbi, sec_bitmap_size, GFP_KERNEL);
 	if (!free_i->free_secmap)
 		return -ENOMEM;
 
@@ -3463,7 +3456,7 @@
 	struct curseg_info *array;
 	int i;
 
-	array = kcalloc(NR_CURSEG_TYPE, sizeof(*array), GFP_KERNEL);
+	array = f2fs_kzalloc(sbi, sizeof(*array) * NR_CURSEG_TYPE, GFP_KERNEL);
 	if (!array)
 		return -ENOMEM;
 
@@ -3471,12 +3464,12 @@
 
 	for (i = 0; i < NR_CURSEG_TYPE; i++) {
 		mutex_init(&array[i].curseg_mutex);
-		array[i].sum_blk = kzalloc(PAGE_SIZE, GFP_KERNEL);
+		array[i].sum_blk = f2fs_kzalloc(sbi, PAGE_SIZE, GFP_KERNEL);
 		if (!array[i].sum_blk)
 			return -ENOMEM;
 		init_rwsem(&array[i].journal_rwsem);
-		array[i].journal = kzalloc(sizeof(struct f2fs_journal),
-							GFP_KERNEL);
+		array[i].journal = f2fs_kzalloc(sbi,
+				sizeof(struct f2fs_journal), GFP_KERNEL);
 		if (!array[i].journal)
 			return -ENOMEM;
 		array[i].segno = NULL_SEGNO;
@@ -3485,7 +3478,7 @@
 	return restore_curseg_summaries(sbi);
 }
 
-static void build_sit_entries(struct f2fs_sb_info *sbi)
+static int build_sit_entries(struct f2fs_sb_info *sbi)
 {
 	struct sit_info *sit_i = SIT_I(sbi);
 	struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_COLD_DATA);
@@ -3495,6 +3488,7 @@
 	int sit_blk_cnt = SIT_BLK_CNT(sbi);
 	unsigned int i, start, end;
 	unsigned int readed, start_blk = 0;
+	int err = 0;
 
 	do {
 		readed = ra_meta_pages(sbi, start_blk, BIO_MAX_PAGES,
@@ -3513,7 +3507,9 @@
 			sit = sit_blk->entries[SIT_ENTRY_OFFSET(sit_i, start)];
 			f2fs_put_page(page, 1);
 
-			check_block_count(sbi, start, &sit);
+			err = check_block_count(sbi, start, &sit);
+			if (err)
+				return err;
 			seg_info_from_raw_sit(se, &sit);
 
 			/* build discard map only one time */
@@ -3548,7 +3544,9 @@
 
 		old_valid_blocks = se->valid_blocks;
 
-		check_block_count(sbi, start, &sit);
+		err = check_block_count(sbi, start, &sit);
+		if (err)
+			break;
 		seg_info_from_raw_sit(se, &sit);
 
 		if (f2fs_discard_en(sbi)) {
@@ -3568,6 +3566,7 @@
 				se->valid_blocks - old_valid_blocks;
 	}
 	up_read(&curseg->journal_rwsem);
+	return err;
 }
 
 static void init_free_segmap(struct f2fs_sb_info *sbi)
@@ -3622,7 +3621,7 @@
 	struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
 	unsigned int bitmap_size = f2fs_bitmap_size(MAIN_SECS(sbi));
 
-	dirty_i->victim_secmap = kvzalloc(bitmap_size, GFP_KERNEL);
+	dirty_i->victim_secmap = f2fs_kvzalloc(sbi, bitmap_size, GFP_KERNEL);
 	if (!dirty_i->victim_secmap)
 		return -ENOMEM;
 	return 0;
@@ -3634,7 +3633,8 @@
 	unsigned int bitmap_size, i;
 
 	/* allocate memory for dirty segments list information */
-	dirty_i = kzalloc(sizeof(struct dirty_seglist_info), GFP_KERNEL);
+	dirty_i = f2fs_kzalloc(sbi, sizeof(struct dirty_seglist_info),
+								GFP_KERNEL);
 	if (!dirty_i)
 		return -ENOMEM;
 
@@ -3644,7 +3644,8 @@
 	bitmap_size = f2fs_bitmap_size(MAIN_SEGS(sbi));
 
 	for (i = 0; i < NR_DIRTY_TYPE; i++) {
-		dirty_i->dirty_segmap[i] = kvzalloc(bitmap_size, GFP_KERNEL);
+		dirty_i->dirty_segmap[i] = f2fs_kvzalloc(sbi, bitmap_size,
+								GFP_KERNEL);
 		if (!dirty_i->dirty_segmap[i])
 			return -ENOMEM;
 	}
@@ -3688,7 +3689,7 @@
 	struct f2fs_sm_info *sm_info;
 	int err;
 
-	sm_info = kzalloc(sizeof(struct f2fs_sm_info), GFP_KERNEL);
+	sm_info = f2fs_kzalloc(sbi, sizeof(struct f2fs_sm_info), GFP_KERNEL);
 	if (!sm_info)
 		return -ENOMEM;
 
@@ -3740,7 +3741,9 @@
 		return err;
 
 	/* reinit free segmap based on SIT */
-	build_sit_entries(sbi);
+	err = build_sit_entries(sbi);
+	if (err)
+		return err;
 
 	init_free_segmap(sbi);
 	err = build_dirty_segmap(sbi);