1 files changed, 649 insertions, 173 deletions

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index c2e4c6ce2cf7..bd94068647ff 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -1,12 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * fs/f2fs/gc.c
  *
  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
  *             http://www.samsung.com/
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
  */
 #include <linux/fs.h>
 #include <linux/module.h>
@@ -43,25 +40,28 @@ static int gc_thread_func(void *data)
 		if (gc_th->gc_wake)
 			gc_th->gc_wake = 0;
 
-		if (try_to_freeze())
+		if (try_to_freeze()) {
+			stat_other_skip_bggc_count(sbi);
 			continue;
+		}
 		if (kthread_should_stop())
 			break;
 
 		if (sbi->sb->s_writers.frozen >= SB_FREEZE_WRITE) {
 			increase_sleep_time(gc_th, &wait_ms);
+			stat_other_skip_bggc_count(sbi);
 			continue;
 		}
 
-#ifdef CONFIG_F2FS_FAULT_INJECTION
 		if (time_to_inject(sbi, FAULT_CHECKPOINT)) {
-			f2fs_show_injection_info(FAULT_CHECKPOINT);
+			f2fs_show_injection_info(sbi, FAULT_CHECKPOINT);
 			f2fs_stop_checkpoint(sbi, false);
 		}
-#endif
 
-		if (!sb_start_write_trylock(sbi->sb))
+		if (!sb_start_write_trylock(sbi->sb)) {
+			stat_other_skip_bggc_count(sbi);
 			continue;
+		}
 
 		/*
 		 * [GC triggering condition]
@@ -76,17 +76,21 @@ static int gc_thread_func(void *data)
 		 * invalidated soon after by user update or deletion.
 		 * So, I'd like to wait some time to collect dirty segments.
 		 */
-		if (!mutex_trylock(&sbi->gc_mutex))
-			goto next;
-
-		if (gc_th->gc_urgent) {
+		if (sbi->gc_mode == GC_URGENT) {
 			wait_ms = gc_th->urgent_sleep_time;
+			mutex_lock(&sbi->gc_mutex);
 			goto do_gc;
 		}
 
-		if (!is_idle(sbi)) {
+		if (!mutex_trylock(&sbi->gc_mutex)) {
+			stat_other_skip_bggc_count(sbi);
+			goto next;
+		}
+
+		if (!is_idle(sbi, GC_TIME)) {
 			increase_sleep_time(gc_th, &wait_ms);
 			mutex_unlock(&sbi->gc_mutex);
+			stat_io_skip_bggc_count(sbi);
 			goto next;
 		}
 
@@ -113,7 +117,7 @@ next:
 	return 0;
 }
 
-int start_gc_thread(struct f2fs_sb_info *sbi)
+int f2fs_start_gc_thread(struct f2fs_sb_info *sbi)
 {
 	struct f2fs_gc_kthread *gc_th;
 	dev_t dev = sbi->sb->s_bdev->bd_dev;
@@ -130,8 +134,6 @@ int start_gc_thread(struct f2fs_sb_info *sbi)
 	gc_th->max_sleep_time = DEF_GC_THREAD_MAX_SLEEP_TIME;
 	gc_th->no_gc_sleep_time = DEF_GC_THREAD_NOGC_SLEEP_TIME;
 
-	gc_th->gc_idle = 0;
-	gc_th->gc_urgent = 0;
 	gc_th->gc_wake= 0;
 
 	sbi->gc_thread = gc_th;
@@ -140,32 +142,35 @@ int start_gc_thread(struct f2fs_sb_info *sbi)
 			"f2fs_gc-%u:%u", MAJOR(dev), MINOR(dev));
 	if (IS_ERR(gc_th->f2fs_gc_task)) {
 		err = PTR_ERR(gc_th->f2fs_gc_task);
-		kfree(gc_th);
+		kvfree(gc_th);
 		sbi->gc_thread = NULL;
 	}
 out:
 	return err;
 }
 
-void stop_gc_thread(struct f2fs_sb_info *sbi)
+void f2fs_stop_gc_thread(struct f2fs_sb_info *sbi)
 {
 	struct f2fs_gc_kthread *gc_th = sbi->gc_thread;
 	if (!gc_th)
 		return;
 	kthread_stop(gc_th->f2fs_gc_task);
-	kfree(gc_th);
+	kvfree(gc_th);
 	sbi->gc_thread = NULL;
 }
 
-static int select_gc_type(struct f2fs_gc_kthread *gc_th, int gc_type)
+static int select_gc_type(struct f2fs_sb_info *sbi, int gc_type)
 {
 	int gc_mode = (gc_type == BG_GC) ? GC_CB : GC_GREEDY;
 
-	if (gc_th && gc_th->gc_idle) {
-		if (gc_th->gc_idle == 1)
-			gc_mode = GC_CB;
-		else if (gc_th->gc_idle == 2)
-			gc_mode = GC_GREEDY;
+	switch (sbi->gc_mode) {
+	case GC_IDLE_CB:
+		gc_mode = GC_CB;
+		break;
+	case GC_IDLE_GREEDY:
+	case GC_URGENT:
+		gc_mode = GC_GREEDY;
+		break;
 	}
 	return gc_mode;
 }
@@ -181,14 +186,16 @@ static void select_policy(struct f2fs_sb_info *sbi, int gc_type,
 		p->max_search = dirty_i->nr_dirty[type];
 		p->ofs_unit = 1;
 	} else {
-		p->gc_mode = select_gc_type(sbi->gc_thread, gc_type);
+		p->gc_mode = select_gc_type(sbi, gc_type);
 		p->dirty_segmap = dirty_i->dirty_segmap[DIRTY];
 		p->max_search = dirty_i->nr_dirty[DIRTY];
 		p->ofs_unit = sbi->segs_per_sec;
 	}
 
 	/* we need to check every dirty segments in the FG_GC case */
-	if (gc_type != FG_GC && p->max_search > sbi->max_victim_search)
+	if (gc_type != FG_GC &&
+			(sbi->gc_mode != GC_URGENT) &&
+			p->max_search > sbi->max_victim_search)
 		p->max_search = sbi->max_victim_search;
 
 	/* let's select beginning hot/small space first in no_heap mode*/
@@ -226,10 +233,6 @@ static unsigned int check_bg_victims(struct f2fs_sb_info *sbi)
 	for_each_set_bit(secno, dirty_i->victim_secmap, MAIN_SECS(sbi)) {
 		if (sec_usage_check(sbi, secno))
 			continue;
-
-		if (no_fggc_candidate(sbi, secno))
-			continue;
-
 		clear_bit(secno, dirty_i->victim_secmap);
 		return GET_SEG_FROM_SEC(sbi, secno);
 	}
@@ -268,16 +271,6 @@ static unsigned int get_cb_cost(struct f2fs_sb_info *sbi, unsigned int segno)
 	return UINT_MAX - ((100 * (100 - u) * age) / (100 + u));
 }
 
-static unsigned int get_greedy_cost(struct f2fs_sb_info *sbi,
-						unsigned int segno)
-{
-	unsigned int valid_blocks =
-			get_valid_blocks(sbi, segno, true);
-
-	return IS_DATASEG(get_seg_entry(sbi, segno)->type) ?
-				valid_blocks * 2 : valid_blocks;
-}
-
 static inline unsigned int get_gc_cost(struct f2fs_sb_info *sbi,
 			unsigned int segno, struct victim_sel_policy *p)
 {
@@ -286,7 +279,7 @@ static inline unsigned int get_gc_cost(struct f2fs_sb_info *sbi,
 
 	/* alloc_mode == LFS */
 	if (p->gc_mode == GC_GREEDY)
-		return get_greedy_cost(sbi, segno);
+		return get_valid_blocks(sbi, segno, true);
 	else
 		return get_cb_cost(sbi, segno);
 }
@@ -318,10 +311,11 @@ static int get_victim_by_default(struct f2fs_sb_info *sbi,
 	struct sit_info *sm = SIT_I(sbi);
 	struct victim_sel_policy p;
 	unsigned int secno, last_victim;
-	unsigned int last_segment = MAIN_SEGS(sbi);
+	unsigned int last_segment;
 	unsigned int nsearched = 0;
 
 	mutex_lock(&dirty_i->seglist_lock);
+	last_segment = MAIN_SECS(sbi) * sbi->segs_per_sec;
 
 	p.alloc_mode = alloc_mode;
 	select_policy(sbi, gc_type, type, &p);
@@ -339,6 +333,22 @@ static int get_victim_by_default(struct f2fs_sb_info *sbi,
 	if (p.max_search == 0)
 		goto out;
 
+	if (__is_large_section(sbi) && p.alloc_mode == LFS) {
+		if (sbi->next_victim_seg[BG_GC] != NULL_SEGNO) {
+			p.min_segno = sbi->next_victim_seg[BG_GC];
+			*result = p.min_segno;
+			sbi->next_victim_seg[BG_GC] = NULL_SEGNO;
+			goto got_result;
+		}
+		if (gc_type == FG_GC &&
+				sbi->next_victim_seg[FG_GC] != NULL_SEGNO) {
+			p.min_segno = sbi->next_victim_seg[FG_GC];
+			*result = p.min_segno;
+			sbi->next_victim_seg[FG_GC] = NULL_SEGNO;
+			goto got_result;
+		}
+	}
+
 	last_victim = sm->last_victim[p.gc_mode];
 	if (p.alloc_mode == LFS && gc_type == FG_GC) {
 		p.min_segno = check_bg_victims(sbi);
@@ -372,14 +382,26 @@ static int get_victim_by_default(struct f2fs_sb_info *sbi,
 			nsearched++;
 		}
 
+#ifdef CONFIG_F2FS_CHECK_FS
+		/*
+		 * skip selecting the invalid segno (that is failed due to block
+		 * validity check failure during GC) to avoid endless GC loop in
+		 * such cases.
+		 */
+		if (test_bit(segno, sm->invalid_segmap))
+			goto next;
+#endif
+
 		secno = GET_SEC_FROM_SEG(sbi, segno);
 
 		if (sec_usage_check(sbi, secno))
 			goto next;
-		if (gc_type == BG_GC && test_bit(secno, dirty_i->victim_secmap))
+		/* Don't touch checkpointed data */
+		if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED) &&
+					get_ckpt_valid_blocks(sbi, segno) &&
+					p.alloc_mode != SSR))
 			goto next;
-		if (gc_type == FG_GC && p.alloc_mode == LFS &&
-					no_fggc_candidate(sbi, secno))
+		if (gc_type == BG_GC && test_bit(secno, dirty_i->victim_secmap))
 			goto next;
 
 		cost = get_gc_cost(sbi, segno, &p);
@@ -394,12 +416,15 @@ next:
 				sm->last_victim[p.gc_mode] = last_victim + 1;
 			else
 				sm->last_victim[p.gc_mode] = segno + 1;
-			sm->last_victim[p.gc_mode] %= MAIN_SEGS(sbi);
+			sm->last_victim[p.gc_mode] %=
+				(MAIN_SECS(sbi) * sbi->segs_per_sec);
 			break;
 		}
 	}
 	if (p.min_segno != NULL_SEGNO) {
 got_it:
+		*result = (p.min_segno / p.ofs_unit) * p.ofs_unit;
+got_result:
 		if (p.alloc_mode == LFS) {
 			secno = GET_SEC_FROM_SEG(sbi, p.min_segno);
 			if (gc_type == FG_GC)
@@ -407,13 +432,13 @@ got_it:
 			else
 				set_bit(secno, dirty_i->victim_secmap);
 		}
-		*result = (p.min_segno / p.ofs_unit) * p.ofs_unit;
 
+	}
+out:
+	if (p.min_segno != NULL_SEGNO)
 		trace_f2fs_get_victim(sbi->sb, type, gc_type, &p,
 				sbi->cur_victim_sec,
 				prefree_segments(sbi), free_segments(sbi));
-	}
-out:
 	mutex_unlock(&dirty_i->seglist_lock);
 
 	return (p.min_segno == NULL_SEGNO) ? 0 : 1;
@@ -441,7 +466,7 @@ static void add_gc_inode(struct gc_inode_list *gc_list, struct inode *inode)
 		iput(inode);
 		return;
 	}
-	new_ie = f2fs_kmem_cache_alloc(inode_entry_slab, GFP_NOFS);
+	new_ie = f2fs_kmem_cache_alloc(f2fs_inode_entry_slab, GFP_NOFS);
 	new_ie->inode = inode;
 
 	f2fs_radix_tree_insert(&gc_list->iroot, inode->i_ino, new_ie);
@@ -455,7 +480,7 @@ static void put_gc_inode(struct gc_inode_list *gc_list)
 		radix_tree_delete(&gc_list->iroot, ie->inode->i_ino);
 		iput(ie->inode);
 		list_del(&ie->list);
-		kmem_cache_free(inode_entry_slab, ie);
+		kmem_cache_free(f2fs_inode_entry_slab, ie);
 	}
 }
 
@@ -466,10 +491,10 @@ static int check_valid_map(struct f2fs_sb_info *sbi,
 	struct seg_entry *sentry;
 	int ret;
 
-	mutex_lock(&sit_i->sentry_lock);
+	down_read(&sit_i->sentry_lock);
 	sentry = get_seg_entry(sbi, segno);
 	ret = f2fs_test_bit(offset, sentry->cur_valid_map);
-	mutex_unlock(&sit_i->sentry_lock);
+	up_read(&sit_i->sentry_lock);
 	return ret;
 }
 
@@ -478,65 +503,81 @@ static int check_valid_map(struct f2fs_sb_info *sbi,
  * On validity, copy that node with cold status, otherwise (invalid node)
  * ignore that.
  */
-static void gc_node_segment(struct f2fs_sb_info *sbi,
+static int gc_node_segment(struct f2fs_sb_info *sbi,
 		struct f2fs_summary *sum, unsigned int segno, int gc_type)
 {
 	struct f2fs_summary *entry;
 	block_t start_addr;
 	int off;
 	int phase = 0;
+	bool fggc = (gc_type == FG_GC);
+	int submitted = 0;
 
 	start_addr = START_BLOCK(sbi, segno);
 
 next_step:
 	entry = sum;
 
+	if (fggc && phase == 2)
+		atomic_inc(&sbi->wb_sync_req[NODE]);
+
 	for (off = 0; off < sbi->blocks_per_seg; off++, entry++) {
 		nid_t nid = le32_to_cpu(entry->nid);
 		struct page *node_page;
 		struct node_info ni;
+		int err;
 
 		/* stop BG_GC if there is not enough free sections. */
 		if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0))
-			return;
+			return submitted;
 
 		if (check_valid_map(sbi, segno, off) == 0)
 			continue;
 
 		if (phase == 0) {
-			ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), 1,
+			f2fs_ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), 1,
 							META_NAT, true);
 			continue;
 		}
 
 		if (phase == 1) {
-			ra_node_page(sbi, nid);
+			f2fs_ra_node_page(sbi, nid);
 			continue;
 		}
 
 		/* phase == 2 */
-		node_page = get_node_page(sbi, nid);
+		node_page = f2fs_get_node_page(sbi, nid);
 		if (IS_ERR(node_page))
 			continue;
 
-		/* block may become invalid during get_node_page */
+		/* block may become invalid during f2fs_get_node_page */
 		if (check_valid_map(sbi, segno, off) == 0) {
 			f2fs_put_page(node_page, 1);
 			continue;
 		}
 
-		get_node_info(sbi, nid, &ni);
+		if (f2fs_get_node_info(sbi, nid, &ni)) {
+			f2fs_put_page(node_page, 1);
+			continue;
+		}
+
 		if (ni.blk_addr != start_addr + off) {
 			f2fs_put_page(node_page, 1);
 			continue;
 		}
 
-		move_node_page(node_page, gc_type);
+		err = f2fs_move_node_page(node_page, gc_type);
+		if (!err && gc_type == FG_GC)
+			submitted++;
 		stat_inc_node_blk_count(sbi, 1, gc_type);
 	}
 
 	if (++phase < 3)
 		goto next_step;
+
+	if (fggc)
+		atomic_dec(&sbi->wb_sync_req[NODE]);
+	return submitted;
 }
 
 /*
@@ -546,7 +587,7 @@ next_step:
  * as indirect or double indirect node blocks, are given, it must be a caller's
  * bug.
  */
-block_t start_bidx_of_node(unsigned int node_ofs, struct inode *inode)
+block_t f2fs_start_bidx_of_node(unsigned int node_ofs, struct inode *inode)
 {
 	unsigned int indirect_blks = 2 * NIDS_PER_BLOCK + 4;
 	unsigned int bidx;
@@ -563,7 +604,7 @@ block_t start_bidx_of_node(unsigned int node_ofs, struct inode *inode)
 		int dec = (node_ofs - indirect_blks - 3) / (NIDS_PER_BLOCK + 1);
 		bidx = node_ofs - 5 - dec;
 	}
-	return bidx * ADDRS_PER_BLOCK + ADDRS_PER_INODE(inode);
+	return bidx * ADDRS_PER_BLOCK(inode) + ADDRS_PER_INODE(inode);
 }
 
 static bool is_alive(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
@@ -577,16 +618,18 @@ static bool is_alive(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
 	nid = le32_to_cpu(sum->nid);
 	ofs_in_node = le16_to_cpu(sum->ofs_in_node);
 
-	node_page = get_node_page(sbi, nid);
+	node_page = f2fs_get_node_page(sbi, nid);
 	if (IS_ERR(node_page))
 		return false;
 
-	get_node_info(sbi, nid, dni);
+	if (f2fs_get_node_info(sbi, nid, dni)) {
+		f2fs_put_page(node_page, 1);
+		return false;
+	}
 
 	if (sum->version != dni->version) {
-		f2fs_msg(sbi->sb, KERN_WARNING,
-				"%s: valid data with mismatched node version.",
-				__func__);
+		f2fs_warn(sbi, "%s: valid data with mismatched node version.",
+			  __func__);
 		set_sbi_flag(sbi, SBI_NEED_FSCK);
 	}
 
@@ -594,52 +637,164 @@ static bool is_alive(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
 	source_blkaddr = datablock_addr(NULL, node_page, ofs_in_node);
 	f2fs_put_page(node_page, 1);
 
-	if (source_blkaddr != blkaddr)
+	if (source_blkaddr != blkaddr) {
+#ifdef CONFIG_F2FS_CHECK_FS
+		unsigned int segno = GET_SEGNO(sbi, blkaddr);
+		unsigned long offset = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
+
+		if (unlikely(check_valid_map(sbi, segno, offset))) {
+			if (!test_and_set_bit(segno, SIT_I(sbi)->invalid_segmap)) {
+				f2fs_err(sbi, "mismatched blkaddr %u (source_blkaddr %u) in seg %u\n",
+						blkaddr, source_blkaddr, segno);
+				f2fs_bug_on(sbi, 1);
+			}
+		}
+#endif
 		return false;
+	}
 	return true;
 }
 
+static int ra_data_block(struct inode *inode, pgoff_t index)
+{
+	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+	struct address_space *mapping = inode->i_mapping;
+	struct dnode_of_data dn;
+	struct page *page;
+	struct extent_info ei = {0, 0, 0};
+	struct f2fs_io_info fio = {
+		.sbi = sbi,
+		.ino = inode->i_ino,
+		.type = DATA,
+		.temp = COLD,
+		.op = REQ_OP_READ,
+		.op_flags = 0,
+		.encrypted_page = NULL,
+		.in_list = false,
+		.retry = false,
+	};
+	int err;
+
+	page = f2fs_grab_cache_page(mapping, index, true);
+	if (!page)
+		return -ENOMEM;
+
+	if (f2fs_lookup_extent_cache(inode, index, &ei)) {
+		dn.data_blkaddr = ei.blk + index - ei.fofs;
+		if (unlikely(!f2fs_is_valid_blkaddr(sbi, dn.data_blkaddr,
+						DATA_GENERIC_ENHANCE_READ))) {
+			err = -EFSCORRUPTED;
+			goto put_page;
+		}
+		goto got_it;
+	}
+
+	set_new_dnode(&dn, inode, NULL, NULL, 0);
+	err = f2fs_get_dnode_of_data(&dn, index, LOOKUP_NODE);
+	if (err)
+		goto put_page;
+	f2fs_put_dnode(&dn);
+
+	if (!__is_valid_data_blkaddr(dn.data_blkaddr)) {
+		err = -ENOENT;
+		goto put_page;
+	}
+	if (unlikely(!f2fs_is_valid_blkaddr(sbi, dn.data_blkaddr,
+						DATA_GENERIC_ENHANCE))) {
+		err = -EFSCORRUPTED;
+		goto put_page;
+	}
+got_it:
+	/* read page */
+	fio.page = page;
+	fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr;
+
+	/*
+	 * don't cache encrypted data into meta inode until previous dirty
+	 * data were writebacked to avoid racing between GC and flush.
+	 */
+	f2fs_wait_on_page_writeback(page, DATA, true, true);
+
+	f2fs_wait_on_block_writeback(inode, dn.data_blkaddr);
+
+	fio.encrypted_page = f2fs_pagecache_get_page(META_MAPPING(sbi),
+					dn.data_blkaddr,
+					FGP_LOCK | FGP_CREAT, GFP_NOFS);
+	if (!fio.encrypted_page) {
+		err = -ENOMEM;
+		goto put_page;
+	}
+
+	err = f2fs_submit_page_bio(&fio);
+	if (err)
+		goto put_encrypted_page;
+	f2fs_put_page(fio.encrypted_page, 0);
+	f2fs_put_page(page, 1);
+	return 0;
+put_encrypted_page:
+	f2fs_put_page(fio.encrypted_page, 1);
+put_page:
+	f2fs_put_page(page, 1);
+	return err;
+}
+
 /*
  * Move data block via META_MAPPING while keeping locked data page.
  * This can be used to move blocks, aka LBAs, directly on disk.
  */
-static void move_data_block(struct inode *inode, block_t bidx,
-					unsigned int segno, int off)
+static int move_data_block(struct inode *inode, block_t bidx,
+				int gc_type, unsigned int segno, int off)
 {
 	struct f2fs_io_info fio = {
 		.sbi = F2FS_I_SB(inode),
+		.ino = inode->i_ino,
 		.type = DATA,
 		.temp = COLD,
 		.op = REQ_OP_READ,
 		.op_flags = 0,
 		.encrypted_page = NULL,
 		.in_list = false,
+		.retry = false,
 	};
 	struct dnode_of_data dn;
 	struct f2fs_summary sum;
 	struct node_info ni;
-	struct page *page;
+	struct page *page, *mpage;
 	block_t newaddr;
-	int err;
+	int err = 0;
+	bool lfs_mode = test_opt(fio.sbi, LFS);
 
 	/* do not read out */
 	page = f2fs_grab_cache_page(inode->i_mapping, bidx, false);
 	if (!page)
-		return;
+		return -ENOMEM;
 
-	if (!check_valid_map(F2FS_I_SB(inode), segno, off))
+	if (!check_valid_map(F2FS_I_SB(inode), segno, off)) {
+		err = -ENOENT;
 		goto out;
+	}
 
-	if (f2fs_is_atomic_file(inode))
+	if (f2fs_is_atomic_file(inode)) {
+		F2FS_I(inode)->i_gc_failures[GC_FAILURE_ATOMIC]++;
+		F2FS_I_SB(inode)->skipped_atomic_files[gc_type]++;
+		err = -EAGAIN;
 		goto out;
+	}
+
+	if (f2fs_is_pinned_file(inode)) {
+		f2fs_pin_file_control(inode, true);
+		err = -EAGAIN;
+		goto out;
+	}
 
 	set_new_dnode(&dn, inode, NULL, NULL, 0);
-	err = get_dnode_of_data(&dn, bidx, LOOKUP_NODE);
+	err = f2fs_get_dnode_of_data(&dn, bidx, LOOKUP_NODE);
 	if (err)
 		goto out;
 
 	if (unlikely(dn.data_blkaddr == NULL_ADDR)) {
 		ClearPageUptodate(page);
+		err = -ENOENT;
 		goto put_out;
 	}
 
@@ -647,56 +802,81 @@ static void move_data_block(struct inode *inode, block_t bidx,
 	 * don't cache encrypted data into meta inode until previous dirty
 	 * data were writebacked to avoid racing between GC and flush.
 	 */
-	f2fs_wait_on_page_writeback(page, DATA, true);
+	f2fs_wait_on_page_writeback(page, DATA, true, true);
+
+	f2fs_wait_on_block_writeback(inode, dn.data_blkaddr);
+
+	err = f2fs_get_node_info(fio.sbi, dn.nid, &ni);
+	if (err)
+		goto put_out;
 
-	get_node_info(fio.sbi, dn.nid, &ni);
 	set_summary(&sum, dn.nid, dn.ofs_in_node, ni.version);
 
 	/* read page */
 	fio.page = page;
 	fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr;
 
-	allocate_data_block(fio.sbi, NULL, fio.old_blkaddr, &newaddr,
+	if (lfs_mode)
+		down_write(&fio.sbi->io_order_lock);
+
+	mpage = f2fs_grab_cache_page(META_MAPPING(fio.sbi),
+					fio.old_blkaddr, false);
+	if (!mpage)
+		goto up_out;
+
+	fio.encrypted_page = mpage;
+
+	/* read source block in mpage */
+	if (!PageUptodate(mpage)) {
+		err = f2fs_submit_page_bio(&fio);
+		if (err) {
+			f2fs_put_page(mpage, 1);
+			goto up_out;
+		}
+		lock_page(mpage);
+		if (unlikely(mpage->mapping != META_MAPPING(fio.sbi) ||
+						!PageUptodate(mpage))) {
+			err = -EIO;
+			f2fs_put_page(mpage, 1);
+			goto up_out;
+		}
+	}
+
+	f2fs_allocate_data_block(fio.sbi, NULL, fio.old_blkaddr, &newaddr,
 					&sum, CURSEG_COLD_DATA, NULL, false);
 
-	fio.encrypted_page = pagecache_get_page(META_MAPPING(fio.sbi), newaddr,
-					FGP_LOCK | FGP_CREAT, GFP_NOFS);
+	fio.encrypted_page = f2fs_pagecache_get_page(META_MAPPING(fio.sbi),
+				newaddr, FGP_LOCK | FGP_CREAT, GFP_NOFS);
 	if (!fio.encrypted_page) {
 		err = -ENOMEM;
+		f2fs_put_page(mpage, 1);
 		goto recover_block;
 	}
 
-	err = f2fs_submit_page_bio(&fio);
-	if (err)
-		goto put_page_out;
-
-	/* write page */
-	lock_page(fio.encrypted_page);
-
-	if (unlikely(fio.encrypted_page->mapping != META_MAPPING(fio.sbi))) {
-		err = -EIO;
-		goto put_page_out;
-	}
-	if (unlikely(!PageUptodate(fio.encrypted_page))) {
-		err = -EIO;
-		goto put_page_out;
-	}
+	/* write target block */
+	f2fs_wait_on_page_writeback(fio.encrypted_page, DATA, true, true);
+	memcpy(page_address(fio.encrypted_page),
+				page_address(mpage), PAGE_SIZE);
+	f2fs_put_page(mpage, 1);
+	invalidate_mapping_pages(META_MAPPING(fio.sbi),
+				fio.old_blkaddr, fio.old_blkaddr);
 
 	set_page_dirty(fio.encrypted_page);
-	f2fs_wait_on_page_writeback(fio.encrypted_page, DATA, true);
 	if (clear_page_dirty_for_io(fio.encrypted_page))
 		dec_page_count(fio.sbi, F2FS_DIRTY_META);
 
 	set_page_writeback(fio.encrypted_page);
+	ClearPageError(page);
 
 	/* allocate block address */
-	f2fs_wait_on_page_writeback(dn.node_page, NODE, true);
+	f2fs_wait_on_page_writeback(dn.node_page, NODE, true, true);
 
 	fio.op = REQ_OP_WRITE;
 	fio.op_flags = REQ_SYNC;
 	fio.new_blkaddr = newaddr;
-	err = f2fs_submit_page_write(&fio);
-	if (err) {
+	f2fs_submit_page_write(&fio);
+	if (fio.retry) {
+		err = -EAGAIN;
 		if (PageWriteback(fio.encrypted_page))
 			end_page_writeback(fio.encrypted_page);
 		goto put_page_out;
@@ -712,37 +892,57 @@ put_page_out:
 	f2fs_put_page(fio.encrypted_page, 1);
 recover_block:
 	if (err)
-		__f2fs_replace_block(fio.sbi, &sum, newaddr, fio.old_blkaddr,
+		f2fs_do_replace_block(fio.sbi, &sum, newaddr, fio.old_blkaddr,
 								true, true);
+up_out:
+	if (lfs_mode)
+		up_write(&fio.sbi->io_order_lock);
 put_out:
 	f2fs_put_dnode(&dn);
 out:
 	f2fs_put_page(page, 1);
+	return err;
 }
 
-static void move_data_page(struct inode *inode, block_t bidx, int gc_type,
+static int move_data_page(struct inode *inode, block_t bidx, int gc_type,
 							unsigned int segno, int off)
 {
 	struct page *page;
+	int err = 0;
 
-	page = get_lock_data_page(inode, bidx, true);
+	page = f2fs_get_lock_data_page(inode, bidx, true);
 	if (IS_ERR(page))
-		return;
+		return PTR_ERR(page);
 
-	if (!check_valid_map(F2FS_I_SB(inode), segno, off))
+	if (!check_valid_map(F2FS_I_SB(inode), segno, off)) {
+		err = -ENOENT;
 		goto out;
+	}
 
-	if (f2fs_is_atomic_file(inode))
+	if (f2fs_is_atomic_file(inode)) {
+		F2FS_I(inode)->i_gc_failures[GC_FAILURE_ATOMIC]++;
+		F2FS_I_SB(inode)->skipped_atomic_files[gc_type]++;
+		err = -EAGAIN;
 		goto out;
+	}
+	if (f2fs_is_pinned_file(inode)) {
+		if (gc_type == FG_GC)
+			f2fs_pin_file_control(inode, true);
+		err = -EAGAIN;
+		goto out;
+	}
 
 	if (gc_type == BG_GC) {
-		if (PageWriteback(page))
+		if (PageWriteback(page)) {
+			err = -EAGAIN;
 			goto out;
+		}
 		set_page_dirty(page);
 		set_cold_data(page);
 	} else {
 		struct f2fs_io_info fio = {
 			.sbi = F2FS_I_SB(inode),
+			.ino = inode->i_ino,
 			.type = DATA,
 			.temp = COLD,
 			.op = REQ_OP_WRITE,
@@ -754,19 +954,19 @@ static void move_data_page(struct inode *inode, block_t bidx, int gc_type,
 			.io_type = FS_GC_DATA_IO,
 		};
 		bool is_dirty = PageDirty(page);
-		int err;
 
 retry:
+		f2fs_wait_on_page_writeback(page, DATA, true, true);
+
 		set_page_dirty(page);
-		f2fs_wait_on_page_writeback(page, DATA, true);
 		if (clear_page_dirty_for_io(page)) {
 			inode_dec_dirty_pages(inode);
-			remove_dirty_inode(inode);
+			f2fs_remove_dirty_inode(inode);
 		}
 
 		set_cold_data(page);
 
-		err = do_write_data_page(&fio);
+		err = f2fs_do_write_data_page(&fio);
 		if (err) {
 			clear_cold_data(page);
 			if (err == -ENOMEM) {
@@ -779,6 +979,7 @@ retry:
 	}
 out:
 	f2fs_put_page(page, 1);
+	return err;
 }
 
 /*
@@ -788,7 +989,7 @@ out:
  * If the parent node is not valid or the data block address is different,
  * the victim data block is ignored.
  */
-static void gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
+static int gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
 		struct gc_inode_list *gc_list, unsigned int segno, int gc_type)
 {
 	struct super_block *sb = sbi->sb;
@@ -796,6 +997,7 @@ static void gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
 	block_t start_addr;
 	int off;
 	int phase = 0;
+	int submitted = 0;
 
 	start_addr = START_BLOCK(sbi, segno);
 
@@ -810,21 +1012,27 @@ next_step:
 		block_t start_bidx;
 		nid_t nid = le32_to_cpu(entry->nid);
 
-		/* stop BG_GC if there is not enough free sections. */
-		if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0))
-			return;
+		/*
+		 * stop BG_GC if there is not enough free sections.
+		 * Or, stop GC if the segment becomes fully valid caused by
+		 * race condition along with SSR block allocation.
+		 */
+		if ((gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0)) ||
+				get_valid_blocks(sbi, segno, false) ==
+							sbi->blocks_per_seg)
+			return submitted;
 
 		if (check_valid_map(sbi, segno, off) == 0)
 			continue;
 
 		if (phase == 0) {
-			ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), 1,
+			f2fs_ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), 1,
 							META_NAT, true);
 			continue;
 		}
 
 		if (phase == 1) {
-			ra_node_page(sbi, nid);
+			f2fs_ra_node_page(sbi, nid);
 			continue;
 		}
 
@@ -833,7 +1041,7 @@ next_step:
 			continue;
 
 		if (phase == 2) {
-			ra_node_page(sbi, dni.ino);
+			f2fs_ra_node_page(sbi, dni.ino);
 			continue;
 		}
 
@@ -844,16 +1052,31 @@ next_step:
 			if (IS_ERR(inode) || is_bad_inode(inode))
 				continue;
 
-			/* if encrypted inode, let's go phase 3 */
-			if (f2fs_encrypted_file(inode)) {
+			if (!down_write_trylock(
+				&F2FS_I(inode)->i_gc_rwsem[WRITE])) {
+				iput(inode);
+				sbi->skipped_gc_rwsem++;
+				continue;
+			}
+
+			start_bidx = f2fs_start_bidx_of_node(nofs, inode) +
+								ofs_in_node;
+
+			if (f2fs_post_read_required(inode)) {
+				int err = ra_data_block(inode, start_bidx);
+
+				up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
+				if (err) {
+					iput(inode);
+					continue;
+				}
 				add_gc_inode(gc_list, inode);
 				continue;
 			}
 
-			start_bidx = start_bidx_of_node(nofs, inode);
-			data_page = get_read_data_page(inode,
-					start_bidx + ofs_in_node, REQ_RAHEAD,
-					true);
+			data_page = f2fs_get_read_data_page(inode,
+						start_bidx, REQ_RAHEAD, true);
+			up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
 			if (IS_ERR(data_page)) {
 				iput(inode);
 				continue;
@@ -869,13 +1092,15 @@ next_step:
 		if (inode) {
 			struct f2fs_inode_info *fi = F2FS_I(inode);
 			bool locked = false;
+			int err;
 
 			if (S_ISREG(inode->i_mode)) {
-				if (!down_write_trylock(&fi->dio_rwsem[READ]))
+				if (!down_write_trylock(&fi->i_gc_rwsem[READ]))
 					continue;
 				if (!down_write_trylock(
-						&fi->dio_rwsem[WRITE])) {
-					up_write(&fi->dio_rwsem[READ]);
+						&fi->i_gc_rwsem[WRITE])) {
+					sbi->skipped_gc_rwsem++;
+					up_write(&fi->i_gc_rwsem[READ]);
 					continue;
 				}
 				locked = true;
@@ -884,17 +1109,22 @@ next_step:
 				inode_dio_wait(inode);
 			}
 
-			start_bidx = start_bidx_of_node(nofs, inode)
+			start_bidx = f2fs_start_bidx_of_node(nofs, inode)
 								+ ofs_in_node;
-			if (f2fs_encrypted_file(inode))
-				move_data_block(inode, start_bidx, segno, off);
+			if (f2fs_post_read_required(inode))
+				err = move_data_block(inode, start_bidx,
+							gc_type, segno, off);
 			else
-				move_data_page(inode, start_bidx, gc_type,
+				err = move_data_page(inode, start_bidx, gc_type,
 								segno, off);
 
+			if (!err && (gc_type == FG_GC ||
+					f2fs_post_read_required(inode)))
+				submitted++;
+
 			if (locked) {
-				up_write(&fi->dio_rwsem[WRITE]);
-				up_write(&fi->dio_rwsem[READ]);
+				up_write(&fi->i_gc_rwsem[WRITE]);
+				up_write(&fi->i_gc_rwsem[READ]);
 			}
 
 			stat_inc_data_blk_count(sbi, 1, gc_type);
@@ -903,6 +1133,8 @@ next_step:
 
 	if (++phase < 5)
 		goto next_step;
+
+	return submitted;
 }
 
 static int __get_victim(struct f2fs_sb_info *sbi, unsigned int *victim,
@@ -911,10 +1143,10 @@ static int __get_victim(struct f2fs_sb_info *sbi, unsigned int *victim,
 	struct sit_info *sit_i = SIT_I(sbi);
 	int ret;
 
-	mutex_lock(&sit_i->sentry_lock);
+	down_write(&sit_i->sentry_lock);
 	ret = DIRTY_I(sbi)->v_ops->get_victim(sbi, victim, gc_type,
 					      NO_CHECK_TYPE, LFS);
-	mutex_unlock(&sit_i->sentry_lock);
+	up_write(&sit_i->sentry_lock);
 	return ret;
 }
 
@@ -927,18 +1159,34 @@ static int do_garbage_collect(struct f2fs_sb_info *sbi,
 	struct blk_plug plug;
 	unsigned int segno = start_segno;
 	unsigned int end_segno = start_segno + sbi->segs_per_sec;
-	int seg_freed = 0;
+	int seg_freed = 0, migrated = 0;
 	unsigned char type = IS_DATASEG(get_seg_entry(sbi, segno)->type) ?
 						SUM_TYPE_DATA : SUM_TYPE_NODE;
+	int submitted = 0;
+
+	if (__is_large_section(sbi))
+		end_segno = rounddown(end_segno, sbi->segs_per_sec);
 
 	/* readahead multi ssa blocks those have contiguous address */
-	if (sbi->segs_per_sec > 1)
-		ra_meta_pages(sbi, GET_SUM_BLOCK(sbi, segno),
-					sbi->segs_per_sec, META_SSA, true);
+	if (__is_large_section(sbi))
+		f2fs_ra_meta_pages(sbi, GET_SUM_BLOCK(sbi, segno),
+					end_segno - segno, META_SSA, true);
 
 	/* reference all summary page */
 	while (segno < end_segno) {
-		sum_page = get_sum_page(sbi, segno++);
+		sum_page = f2fs_get_sum_page(sbi, segno++);
+		if (IS_ERR(sum_page)) {
+			int err = PTR_ERR(sum_page);
+
+			end_segno = segno - 1;
+			for (segno = start_segno; segno < end_segno; segno++) {
+				sum_page = find_get_page(META_MAPPING(sbi),
+						GET_SUM_BLOCK(sbi, segno));
+				f2fs_put_page(sum_page, 0);
+				f2fs_put_page(sum_page, 0);
+			}
+			return err;
+		}
 		unlock_page(sum_page);
 	}
 
@@ -953,30 +1201,34 @@ static int do_garbage_collect(struct f2fs_sb_info *sbi,
 
 		if (get_valid_blocks(sbi, segno, false) == 0)
 			goto freed;
+		if (__is_large_section(sbi) &&
+				migrated >= sbi->migration_granularity)
+			goto skip;
 		if (!PageUptodate(sum_page) || unlikely(f2fs_cp_error(sbi)))
-			goto next;
+			goto skip;
 
 		sum = page_address(sum_page);
 		if (type != GET_SUM_TYPE((&sum->footer))) {
-			f2fs_msg(sbi->sb, KERN_ERR, "Inconsistent segment (%u) "
-				"type [%d, %d] in SSA and SIT",
-				segno, type, GET_SUM_TYPE((&sum->footer)));
+			f2fs_err(sbi, "Inconsistent segment (%u) type [%d, %d] in SSA and SIT",
+				 segno, type, GET_SUM_TYPE((&sum->footer)));
 			set_sbi_flag(sbi, SBI_NEED_FSCK);
-			goto next;
+			f2fs_stop_checkpoint(sbi, false);
+			goto skip;
 		}
 
 		/*
 		 * this is to avoid deadlock:
 		 * - lock_page(sum_page)         - f2fs_replace_block
-		 *  - check_valid_map()            - mutex_lock(sentry_lock)
-		 *   - mutex_lock(sentry_lock)     - change_curseg()
+		 *  - check_valid_map()            - down_write(sentry_lock)
+		 *   - down_read(sentry_lock)     - change_curseg()
 		 *                                  - lock_page(sum_page)
 		 */
 		if (type == SUM_TYPE_NODE)
-			gc_node_segment(sbi, sum->entries, segno, gc_type);
-		else
-			gc_data_segment(sbi, sum->entries, gc_list, segno,
+			submitted += gc_node_segment(sbi, sum->entries, segno,
 								gc_type);
+		else
+			submitted += gc_data_segment(sbi, sum->entries, gc_list,
+							segno, gc_type);
 
 		stat_inc_seg_count(sbi, type, gc_type);
 
@@ -984,11 +1236,15 @@ freed:
 		if (gc_type == FG_GC &&
 				get_valid_blocks(sbi, segno, false) == 0)
 			seg_freed++;
-next:
+		migrated++;
+
+		if (__is_large_section(sbi) && segno + 1 < end_segno)
+			sbi->next_victim_seg[gc_type] = segno + 1;
+skip:
 		f2fs_put_page(sum_page, 0);
 	}
 
-	if (gc_type == FG_GC)
+	if (submitted)
 		f2fs_submit_merged_write(sbi,
 				(type == SUM_TYPE_NODE) ? NODE : DATA);
 
@@ -1011,6 +1267,9 @@ int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
 		.ilist = LIST_HEAD_INIT(gc_list.ilist),
 		.iroot = RADIX_TREE_INIT(GFP_NOFS),
 	};
+	unsigned long long last_skipped = sbi->skipped_atomic_files[FG_GC];
+	unsigned long long first_skipped;
+	unsigned int skipped_round = 0, round = 0;
 
 	trace_f2fs_gc_begin(sbi->sb, sync, background,
 				get_pages(sbi, F2FS_DIRTY_NODES),
@@ -1022,6 +1281,8 @@ int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
 				prefree_segments(sbi));
 
 	cpc.reason = __get_cp_reason(sbi);
+	sbi->skipped_gc_rwsem = 0;
+	first_skipped = last_skipped;
 gc_more:
 	if (unlikely(!(sbi->sb->s_flags & MS_ACTIVE))) {
 		ret = -EINVAL;
@@ -1038,8 +1299,9 @@ gc_more:
 		 * threshold, we can make them free by checkpoint. Then, we
 		 * secure free segments which doesn't need fggc any more.
 		 */
-		if (prefree_segments(sbi)) {
-			ret = write_checkpoint(sbi, &cpc);
+		if (prefree_segments(sbi) &&
+				!is_sbi_flag_set(sbi, SBI_CP_DISABLED)) {
+			ret = f2fs_write_checkpoint(sbi, &cpc);
 			if (ret)
 				goto stop;
 		}
@@ -1062,17 +1324,36 @@ gc_more:
 		sec_freed++;
 	total_freed += seg_freed;
 
-	if (gc_type == FG_GC)
+	if (gc_type == FG_GC) {
+		if (sbi->skipped_atomic_files[FG_GC] > last_skipped ||
+						sbi->skipped_gc_rwsem)
+			skipped_round++;
+		last_skipped = sbi->skipped_atomic_files[FG_GC];
+		round++;
+	}
+
+	if (gc_type == FG_GC && seg_freed)
 		sbi->cur_victim_sec = NULL_SEGNO;
 
-	if (!sync) {
-		if (has_not_enough_free_secs(sbi, sec_freed, 0)) {
+	if (sync)
+		goto stop;
+
+	if (has_not_enough_free_secs(sbi, sec_freed, 0)) {
+		if (skipped_round <= MAX_SKIP_GC_COUNT ||
+					skipped_round * 2 < round) {
 			segno = NULL_SEGNO;
 			goto gc_more;
 		}
 
-		if (gc_type == FG_GC)
-			ret = write_checkpoint(sbi, &cpc);
+		if (first_skipped < last_skipped &&
+				(last_skipped - first_skipped) >
+						sbi->skipped_gc_rwsem) {
+			f2fs_drop_inmem_pages_all(sbi, true);
+			segno = NULL_SEGNO;
+			goto gc_more;
+		}
+		if (gc_type == FG_GC && !is_sbi_flag_set(sbi, SBI_CP_DISABLED))
+			ret = f2fs_write_checkpoint(sbi, &cpc);
 	}
 stop:
 	SIT_I(sbi)->last_victim[ALLOC_NEXT] = 0;
@@ -1096,22 +1377,217 @@ stop:
 	return ret;
 }
 
-void build_gc_manager(struct f2fs_sb_info *sbi)
+void f2fs_build_gc_manager(struct f2fs_sb_info *sbi)
 {
-	u64 main_count, resv_count, ovp_count;
-
 	DIRTY_I(sbi)->v_ops = &default_v_ops;
 
-	/* threshold of # of valid blocks in a section for victims of FG_GC */
-	main_count = SM_I(sbi)->main_segments << sbi->log_blocks_per_seg;
-	resv_count = SM_I(sbi)->reserved_segments << sbi->log_blocks_per_seg;
-	ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
-
-	sbi->fggc_threshold = div64_u64((main_count - ovp_count) *
-				BLKS_PER_SEC(sbi), (main_count - resv_count));
+	sbi->gc_pin_file_threshold = DEF_GC_FAILED_PINNED_FILES;
 
 	/* give warm/cold data area from slower device */
-	if (f2fs_is_multi_device(sbi) && sbi->segs_per_sec == 1)
+	if (f2fs_is_multi_device(sbi) && !__is_large_section(sbi))
 		SIT_I(sbi)->last_victim[ALLOC_NEXT] =
 				GET_SEGNO(sbi, FDEV(0).end_blk) + 1;
 }
+
+static int free_segment_range(struct f2fs_sb_info *sbi, unsigned int start,
+							unsigned int end)
+{
+	int type;
+	unsigned int segno, next_inuse;
+	int err = 0;
+
+	/* Move out cursegs from the target range */
+	for (type = CURSEG_HOT_DATA; type < NR_CURSEG_TYPE; type++)
+		allocate_segment_for_resize(sbi, type, start, end);
+
+	/* do GC to move out valid blocks in the range */
+	for (segno = start; segno <= end; segno += sbi->segs_per_sec) {
+		struct gc_inode_list gc_list = {
+			.ilist = LIST_HEAD_INIT(gc_list.ilist),
+			.iroot = RADIX_TREE_INIT(GFP_NOFS),
+		};
+
+		mutex_lock(&sbi->gc_mutex);
+		do_garbage_collect(sbi, segno, &gc_list, FG_GC);
+		mutex_unlock(&sbi->gc_mutex);
+		put_gc_inode(&gc_list);
+
+		if (get_valid_blocks(sbi, segno, true))
+			return -EAGAIN;
+	}
+
+	err = f2fs_sync_fs(sbi->sb, 1);
+	if (err)
+		return err;
+
+	next_inuse = find_next_inuse(FREE_I(sbi), end + 1, start);
+	if (next_inuse <= end) {
+		f2fs_err(sbi, "segno %u should be free but still inuse!",
+			 next_inuse);
+		f2fs_bug_on(sbi, 1);
+	}
+	return err;
+}
+
+static void update_sb_metadata(struct f2fs_sb_info *sbi, int secs)
+{
+	struct f2fs_super_block *raw_sb = F2FS_RAW_SUPER(sbi);
+	int section_count = le32_to_cpu(raw_sb->section_count);
+	int segment_count = le32_to_cpu(raw_sb->segment_count);
+	int segment_count_main = le32_to_cpu(raw_sb->segment_count_main);
+	long long block_count = le64_to_cpu(raw_sb->block_count);
+	int segs = secs * sbi->segs_per_sec;
+
+	raw_sb->section_count = cpu_to_le32(section_count + secs);
+	raw_sb->segment_count = cpu_to_le32(segment_count + segs);
+	raw_sb->segment_count_main = cpu_to_le32(segment_count_main + segs);
+	raw_sb->block_count = cpu_to_le64(block_count +
+					(long long)segs * sbi->blocks_per_seg);
+	if (f2fs_is_multi_device(sbi)) {
+		int last_dev = sbi->s_ndevs - 1;
+		int dev_segs =
+			le32_to_cpu(raw_sb->devs[last_dev].total_segments);
+
+		raw_sb->devs[last_dev].total_segments =
+						cpu_to_le32(dev_segs + segs);
+	}
+}
+
+static void update_fs_metadata(struct f2fs_sb_info *sbi, int secs)
+{
+	int segs = secs * sbi->segs_per_sec;
+	long long blks = (long long)segs * sbi->blocks_per_seg;
+	long long user_block_count =
+				le64_to_cpu(F2FS_CKPT(sbi)->user_block_count);
+
+	SM_I(sbi)->segment_count = (int)SM_I(sbi)->segment_count + segs;
+	MAIN_SEGS(sbi) = (int)MAIN_SEGS(sbi) + segs;
+	FREE_I(sbi)->free_sections = (int)FREE_I(sbi)->free_sections + secs;
+	FREE_I(sbi)->free_segments = (int)FREE_I(sbi)->free_segments + segs;
+	F2FS_CKPT(sbi)->user_block_count = cpu_to_le64(user_block_count + blks);
+
+	if (f2fs_is_multi_device(sbi)) {
+		int last_dev = sbi->s_ndevs - 1;
+
+		FDEV(last_dev).total_segments =
+				(int)FDEV(last_dev).total_segments + segs;
+		FDEV(last_dev).end_blk =
+				(long long)FDEV(last_dev).end_blk + blks;
+#ifdef CONFIG_BLK_DEV_ZONED
+		FDEV(last_dev).nr_blkz = (int)FDEV(last_dev).nr_blkz +
+					(int)(blks >> sbi->log_blocks_per_blkz);
+#endif
+	}
+}
+
+int f2fs_resize_fs(struct f2fs_sb_info *sbi, __u64 block_count)
+{
+	__u64 old_block_count, shrunk_blocks;
+	unsigned int secs;
+	int gc_mode, gc_type;
+	int err = 0;
+	__u32 rem;
+
+	old_block_count = le64_to_cpu(F2FS_RAW_SUPER(sbi)->block_count);
+	if (block_count > old_block_count)
+		return -EINVAL;
+
+	if (f2fs_is_multi_device(sbi)) {
+		int last_dev = sbi->s_ndevs - 1;
+		__u64 last_segs = FDEV(last_dev).total_segments;
+
+		if (block_count + last_segs * sbi->blocks_per_seg <=
+								old_block_count)
+			return -EINVAL;
+	}
+
+	/* new fs size should align to section size */
+	div_u64_rem(block_count, BLKS_PER_SEC(sbi), &rem);
+	if (rem)
+		return -EINVAL;
+
+	if (block_count == old_block_count)
+		return 0;
+
+	if (is_sbi_flag_set(sbi, SBI_NEED_FSCK)) {
+		f2fs_err(sbi, "Should run fsck to repair first.");
+		return -EFSCORRUPTED;
+	}
+
+	if (test_opt(sbi, DISABLE_CHECKPOINT)) {
+		f2fs_err(sbi, "Checkpoint should be enabled.");
+		return -EINVAL;
+	}
+
+	freeze_bdev(sbi->sb->s_bdev);
+
+	shrunk_blocks = old_block_count - block_count;
+	secs = div_u64(shrunk_blocks, BLKS_PER_SEC(sbi));
+	spin_lock(&sbi->stat_lock);
+	if (shrunk_blocks + valid_user_blocks(sbi) +
+		sbi->current_reserved_blocks + sbi->unusable_block_count +
+		F2FS_OPTION(sbi).root_reserved_blocks > sbi->user_block_count)
+		err = -ENOSPC;
+	else
+		sbi->user_block_count -= shrunk_blocks;
+	spin_unlock(&sbi->stat_lock);
+	if (err) {
+		thaw_bdev(sbi->sb->s_bdev, sbi->sb);
+		return err;
+	}
+
+	mutex_lock(&sbi->resize_mutex);
+	set_sbi_flag(sbi, SBI_IS_RESIZEFS);
+
+	mutex_lock(&DIRTY_I(sbi)->seglist_lock);
+
+	MAIN_SECS(sbi) -= secs;
+
+	for (gc_mode = 0; gc_mode < MAX_GC_POLICY; gc_mode++)
+		if (SIT_I(sbi)->last_victim[gc_mode] >=
+					MAIN_SECS(sbi) * sbi->segs_per_sec)
+			SIT_I(sbi)->last_victim[gc_mode] = 0;
+
+	for (gc_type = BG_GC; gc_type <= FG_GC; gc_type++)
+		if (sbi->next_victim_seg[gc_type] >=
+					MAIN_SECS(sbi) * sbi->segs_per_sec)
+			sbi->next_victim_seg[gc_type] = NULL_SEGNO;
+
+	mutex_unlock(&DIRTY_I(sbi)->seglist_lock);
+
+	err = free_segment_range(sbi, MAIN_SECS(sbi) * sbi->segs_per_sec,
+			MAIN_SEGS(sbi) - 1);
+	if (err)
+		goto out;
+
+	update_sb_metadata(sbi, -secs);
+
+	err = f2fs_commit_super(sbi, false);
+	if (err) {
+		update_sb_metadata(sbi, secs);
+		goto out;
+	}
+
+	update_fs_metadata(sbi, -secs);
+	clear_sbi_flag(sbi, SBI_IS_RESIZEFS);
+	err = f2fs_sync_fs(sbi->sb, 1);
+	if (err) {
+		update_fs_metadata(sbi, secs);
+		update_sb_metadata(sbi, secs);
+		f2fs_commit_super(sbi, false);
+	}
+out:
+	if (err) {
+		set_sbi_flag(sbi, SBI_NEED_FSCK);
+		f2fs_err(sbi, "resize_fs failed, should run fsck to repair!");
+
+		MAIN_SECS(sbi) += secs;
+		spin_lock(&sbi->stat_lock);
+		sbi->user_block_count += shrunk_blocks;
+		spin_unlock(&sbi->stat_lock);
+	}
+	clear_sbi_flag(sbi, SBI_IS_RESIZEFS);
+	mutex_unlock(&sbi->resize_mutex);
+	thaw_bdev(sbi->sb->s_bdev, sbi->sb);
+	return err;
+}