Merge tag 'f2fs-for-5.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs

Pull f2fs updates from Jaegeuk Kim:
 "In this round, we've added new features such as zone capacity for ZNS
  and a new GC policy, ATGC, along with in-memory segment management. In
  addition, we could improve the decompression speed significantly by
  changing virtual mapping method. Even though we've fixed lots of small
  bugs in compression support, I feel that it becomes more stable so
  that I could give it a try in production.

  Enhancements:
   - suport zone capacity in NVMe Zoned Namespace devices
   - introduce in-memory current segment management
   - add standart casefolding support
   - support age threshold based garbage collection
   - improve decompression speed by changing virtual mapping method

  Bug fixes:
   - fix condition checks in some ioctl() such as compression, move_range, etc
   - fix 32/64bits support in data structures
   - fix memory allocation in zstd decompress
   - add some boundary checks to avoid kernel panic on corrupted image
   - fix disallowing compression for non-empty file
   - fix slab leakage of compressed block writes

  In addition, it includes code refactoring for better readability and
  minor bug fixes for compression and zoned device support"

* tag 'f2fs-for-5.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs: (51 commits)
  f2fs: code cleanup by removing unnecessary check
  f2fs: wait for sysfs kobject removal before freeing f2fs_sb_info
  f2fs: fix writecount false positive in releasing compress blocks
  f2fs: introduce check_swap_activate_fast()
  f2fs: don't issue flush in f2fs_flush_device_cache() for nobarrier case
  f2fs: handle errors of f2fs_get_meta_page_nofail
  f2fs: fix to set SBI_NEED_FSCK flag for inconsistent inode
  f2fs: reject CASEFOLD inode flag without casefold feature
  f2fs: fix memory alignment to support 32bit
  f2fs: fix slab leak of rpages pointer
  f2fs: compress: fix to disallow enabling compress on non-empty file
  f2fs: compress: introduce cic/dic slab cache
  f2fs: compress: introduce page array slab cache
  f2fs: fix to do sanity check on segment/section count
  f2fs: fix to check segment boundary during SIT page readahead
  f2fs: fix uninit-value in f2fs_lookup
  f2fs: remove unneeded parameter in find_in_block()
  f2fs: fix wrong total_sections check and fsmeta check
  f2fs: remove duplicated code in sanity_check_area_boundary
  f2fs: remove unused check on version_bitmap
  ...

22 files changed, 1701 insertions, 470 deletions

diff --git a/fs/f2fs/acl.c b/fs/f2fs/acl.c
index 217b290ae3a5..306413589827 100644
--- a/fs/f2fs/acl.c
+++ b/fs/f2fs/acl.c
@@ -160,7 +160,7 @@ static void *f2fs_acl_to_disk(struct f2fs_sb_info *sbi,
 	return (void *)f2fs_acl;
 
 fail:
-	kvfree(f2fs_acl);
+	kfree(f2fs_acl);
 	return ERR_PTR(-EINVAL);
 }
 
@@ -190,7 +190,7 @@ static struct posix_acl *__f2fs_get_acl(struct inode *inode, int type,
 		acl = NULL;
 	else
 		acl = ERR_PTR(retval);
-	kvfree(value);
+	kfree(value);
 
 	return acl;
 }
@@ -240,7 +240,7 @@ static int __f2fs_set_acl(struct inode *inode, int type,
 
 	error = f2fs_setxattr(inode, name_index, "", value, size, ipage, 0);
 
-	kvfree(value);
+	kfree(value);
 	if (!error)
 		set_cached_acl(inode, type, acl);
 
diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index ff807e14c891..023462e80e58 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -107,7 +107,7 @@ struct page *f2fs_get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
 	return __get_meta_page(sbi, index, true);
 }
 
-struct page *f2fs_get_meta_page_nofail(struct f2fs_sb_info *sbi, pgoff_t index)
+struct page *f2fs_get_meta_page_retry(struct f2fs_sb_info *sbi, pgoff_t index)
 {
 	struct page *page;
 	int count = 0;
@@ -243,6 +243,8 @@ int f2fs_ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages,
 					blkno * NAT_ENTRY_PER_BLOCK);
 			break;
 		case META_SIT:
+			if (unlikely(blkno >= TOTAL_SEGS(sbi)))
+				goto out;
 			/* get sit block addr */
 			fio.new_blkaddr = current_sit_addr(sbi,
 					blkno * SIT_ENTRY_PER_BLOCK);
@@ -1047,8 +1049,12 @@ int f2fs_sync_dirty_inodes(struct f2fs_sb_info *sbi, enum inode_type type)
 				get_pages(sbi, is_dir ?
 				F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA));
 retry:
-	if (unlikely(f2fs_cp_error(sbi)))
+	if (unlikely(f2fs_cp_error(sbi))) {
+		trace_f2fs_sync_dirty_inodes_exit(sbi->sb, is_dir,
+				get_pages(sbi, is_dir ?
+				F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA));
 		return -EIO;
+	}
 
 	spin_lock(&sbi->inode_lock[type]);
 
@@ -1619,11 +1625,16 @@ int f2fs_write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
 
 	f2fs_flush_sit_entries(sbi, cpc);
 
+	/* save inmem log status */
+	f2fs_save_inmem_curseg(sbi);
+
 	err = do_checkpoint(sbi, cpc);
 	if (err)
 		f2fs_release_discard_addrs(sbi);
 	else
 		f2fs_clear_prefree_segments(sbi, cpc);
+
+	f2fs_restore_inmem_curseg(sbi);
 stop:
 	unblock_operations(sbi);
 	stat_inc_cp_count(sbi->stat_info);
@@ -1654,7 +1665,7 @@ void f2fs_init_ino_entry_info(struct f2fs_sb_info *sbi)
 	}
 
 	sbi->max_orphans = (sbi->blocks_per_seg - F2FS_CP_PACKS -
-			NR_CURSEG_TYPE - __cp_payload(sbi)) *
+			NR_CURSEG_PERSIST_TYPE - __cp_payload(sbi)) *
 				F2FS_ORPHANS_PER_BLOCK;
 }
 
diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
index 1dfb126a0cb2..14262e0f1cd6 100644
--- a/fs/f2fs/compress.c
+++ b/fs/f2fs/compress.c
@@ -17,6 +17,33 @@
 #include "node.h"
 #include <trace/events/f2fs.h>
 
+static struct kmem_cache *cic_entry_slab;
+static struct kmem_cache *dic_entry_slab;
+
+static void *page_array_alloc(struct inode *inode, int nr)
+{
+	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+	unsigned int size = sizeof(struct page *) * nr;
+
+	if (likely(size <= sbi->page_array_slab_size))
+		return kmem_cache_zalloc(sbi->page_array_slab, GFP_NOFS);
+	return f2fs_kzalloc(sbi, size, GFP_NOFS);
+}
+
+static void page_array_free(struct inode *inode, void *pages, int nr)
+{
+	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+	unsigned int size = sizeof(struct page *) * nr;
+
+	if (!pages)
+		return;
+
+	if (likely(size <= sbi->page_array_slab_size))
+		kmem_cache_free(sbi->page_array_slab, pages);
+	else
+		kfree(pages);
+}
+
 struct f2fs_compress_ops {
 	int (*init_compress_ctx)(struct compress_ctx *cc);
 	void (*destroy_compress_ctx)(struct compress_ctx *cc);
@@ -130,19 +157,16 @@ struct page *f2fs_compress_control_page(struct page *page)
 
 int f2fs_init_compress_ctx(struct compress_ctx *cc)
 {
-	struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
-
-	if (cc->nr_rpages)
+	if (cc->rpages)
 		return 0;
 
-	cc->rpages = f2fs_kzalloc(sbi, sizeof(struct page *) <<
-					cc->log_cluster_size, GFP_NOFS);
+	cc->rpages = page_array_alloc(cc->inode, cc->cluster_size);
 	return cc->rpages ? 0 : -ENOMEM;
 }
 
 void f2fs_destroy_compress_ctx(struct compress_ctx *cc)
 {
-	kfree(cc->rpages);
+	page_array_free(cc->inode, cc->rpages, cc->cluster_size);
 	cc->rpages = NULL;
 	cc->nr_rpages = 0;
 	cc->nr_cpages = 0;
@@ -382,16 +406,17 @@ static int zstd_init_decompress_ctx(struct decompress_io_ctx *dic)
 	ZSTD_DStream *stream;
 	void *workspace;
 	unsigned int workspace_size;
+	unsigned int max_window_size =
+			MAX_COMPRESS_WINDOW_SIZE(dic->log_cluster_size);
 
-	workspace_size = ZSTD_DStreamWorkspaceBound(MAX_COMPRESS_WINDOW_SIZE);
+	workspace_size = ZSTD_DStreamWorkspaceBound(max_window_size);
 
 	workspace = f2fs_kvmalloc(F2FS_I_SB(dic->inode),
 					workspace_size, GFP_NOFS);
 	if (!workspace)
 		return -ENOMEM;
 
-	stream = ZSTD_initDStream(MAX_COMPRESS_WINDOW_SIZE,
-					workspace, workspace_size);
+	stream = ZSTD_initDStream(max_window_size, workspace, workspace_size);
 	if (!stream) {
 		printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_initDStream failed\n",
 				KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
@@ -554,13 +579,29 @@ static void f2fs_compress_free_page(struct page *page)
 	mempool_free(page, compress_page_pool);
 }
 
+#define MAX_VMAP_RETRIES	3
+
+static void *f2fs_vmap(struct page **pages, unsigned int count)
+{
+	int i;
+	void *buf = NULL;
+
+	for (i = 0; i < MAX_VMAP_RETRIES; i++) {
+		buf = vm_map_ram(pages, count, -1);
+		if (buf)
+			break;
+		vm_unmap_aliases();
+	}
+	return buf;
+}
+
 static int f2fs_compress_pages(struct compress_ctx *cc)
 {
-	struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
 	struct f2fs_inode_info *fi = F2FS_I(cc->inode);
 	const struct f2fs_compress_ops *cops =
 				f2fs_cops[fi->i_compress_algorithm];
-	unsigned int max_len, nr_cpages;
+	unsigned int max_len, new_nr_cpages;
+	struct page **new_cpages;
 	int i, ret;
 
 	trace_f2fs_compress_pages_start(cc->inode, cc->cluster_idx,
@@ -575,8 +616,7 @@ static int f2fs_compress_pages(struct compress_ctx *cc)
 	max_len = COMPRESS_HEADER_SIZE + cc->clen;
 	cc->nr_cpages = DIV_ROUND_UP(max_len, PAGE_SIZE);
 
-	cc->cpages = f2fs_kzalloc(sbi, sizeof(struct page *) *
-					cc->nr_cpages, GFP_NOFS);
+	cc->cpages = page_array_alloc(cc->inode, cc->nr_cpages);
 	if (!cc->cpages) {
 		ret = -ENOMEM;
 		goto destroy_compress_ctx;
@@ -590,13 +630,13 @@ static int f2fs_compress_pages(struct compress_ctx *cc)
 		}
 	}
 
-	cc->rbuf = vmap(cc->rpages, cc->cluster_size, VM_MAP, PAGE_KERNEL_RO);
+	cc->rbuf = f2fs_vmap(cc->rpages, cc->cluster_size);
 	if (!cc->rbuf) {
 		ret = -ENOMEM;
 		goto out_free_cpages;
 	}
 
-	cc->cbuf = vmap(cc->cpages, cc->nr_cpages, VM_MAP, PAGE_KERNEL);
+	cc->cbuf = f2fs_vmap(cc->cpages, cc->nr_cpages);
 	if (!cc->cbuf) {
 		ret = -ENOMEM;
 		goto out_vunmap_rbuf;
@@ -618,16 +658,28 @@ static int f2fs_compress_pages(struct compress_ctx *cc)
 	for (i = 0; i < COMPRESS_DATA_RESERVED_SIZE; i++)
 		cc->cbuf->reserved[i] = cpu_to_le32(0);
 
-	nr_cpages = DIV_ROUND_UP(cc->clen + COMPRESS_HEADER_SIZE, PAGE_SIZE);
+	new_nr_cpages = DIV_ROUND_UP(cc->clen + COMPRESS_HEADER_SIZE, PAGE_SIZE);
+
+	/* Now we're going to cut unnecessary tail pages */
+	new_cpages = page_array_alloc(cc->inode, new_nr_cpages);
+	if (!new_cpages) {
+		ret = -ENOMEM;
+		goto out_vunmap_cbuf;
+	}
 
 	/* zero out any unused part of the last page */
 	memset(&cc->cbuf->cdata[cc->clen], 0,
-	       (nr_cpages * PAGE_SIZE) - (cc->clen + COMPRESS_HEADER_SIZE));
+			(new_nr_cpages * PAGE_SIZE) -
+			(cc->clen + COMPRESS_HEADER_SIZE));
 
-	vunmap(cc->cbuf);
-	vunmap(cc->rbuf);
+	vm_unmap_ram(cc->cbuf, cc->nr_cpages);
+	vm_unmap_ram(cc->rbuf, cc->cluster_size);
 
-	for (i = nr_cpages; i < cc->nr_cpages; i++) {
+	for (i = 0; i < cc->nr_cpages; i++) {
+		if (i < new_nr_cpages) {
+			new_cpages[i] = cc->cpages[i];
+			continue;
+		}
 		f2fs_compress_free_page(cc->cpages[i]);
 		cc->cpages[i] = NULL;
 	}
@@ -635,22 +687,24 @@ static int f2fs_compress_pages(struct compress_ctx *cc)
 	if (cops->destroy_compress_ctx)
 		cops->destroy_compress_ctx(cc);
 
-	cc->nr_cpages = nr_cpages;
+	page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
+	cc->cpages = new_cpages;
+	cc->nr_cpages = new_nr_cpages;
 
 	trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
 							cc->clen, ret);
 	return 0;
 
 out_vunmap_cbuf:
-	vunmap(cc->cbuf);
+	vm_unmap_ram(cc->cbuf, cc->nr_cpages);
 out_vunmap_rbuf:
-	vunmap(cc->rbuf);
+	vm_unmap_ram(cc->rbuf, cc->cluster_size);
 out_free_cpages:
 	for (i = 0; i < cc->nr_cpages; i++) {
 		if (cc->cpages[i])
 			f2fs_compress_free_page(cc->cpages[i]);
 	}
-	kfree(cc->cpages);
+	page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
 	cc->cpages = NULL;
 destroy_compress_ctx:
 	if (cops->destroy_compress_ctx)
@@ -677,7 +731,7 @@ void f2fs_decompress_pages(struct bio *bio, struct page *page, bool verity)
 	if (bio->bi_status || PageError(page))
 		dic->failed = true;
 
-	if (refcount_dec_not_one(&dic->ref))
+	if (atomic_dec_return(&dic->pending_pages))
 		return;
 
 	trace_f2fs_decompress_pages_start(dic->inode, dic->cluster_idx,
@@ -689,8 +743,7 @@ void f2fs_decompress_pages(struct bio *bio, struct page *page, bool verity)
 		goto out_free_dic;
 	}
 
-	dic->tpages = f2fs_kzalloc(sbi, sizeof(struct page *) *
-					dic->cluster_size, GFP_NOFS);
+	dic->tpages = page_array_alloc(dic->inode, dic->cluster_size);
 	if (!dic->tpages) {
 		ret = -ENOMEM;
 		goto out_free_dic;
@@ -715,13 +768,13 @@ void f2fs_decompress_pages(struct bio *bio, struct page *page, bool verity)
 			goto out_free_dic;
 	}
 
-	dic->rbuf = vmap(dic->tpages, dic->cluster_size, VM_MAP, PAGE_KERNEL);
+	dic->rbuf = f2fs_vmap(dic->tpages, dic->cluster_size);
 	if (!dic->rbuf) {
 		ret = -ENOMEM;
 		goto destroy_decompress_ctx;
 	}
 
-	dic->cbuf = vmap(dic->cpages, dic->nr_cpages, VM_MAP, PAGE_KERNEL_RO);
+	dic->cbuf = f2fs_vmap(dic->cpages, dic->nr_cpages);
 	if (!dic->cbuf) {
 		ret = -ENOMEM;
 		goto out_vunmap_rbuf;
@@ -738,15 +791,15 @@ void f2fs_decompress_pages(struct bio *bio, struct page *page, bool verity)
 	ret = cops->decompress_pages(dic);
 
 out_vunmap_cbuf:
-	vunmap(dic->cbuf);
+	vm_unmap_ram(dic->cbuf, dic->nr_cpages);
 out_vunmap_rbuf:
-	vunmap(dic->rbuf);
+	vm_unmap_ram(dic->rbuf, dic->cluster_size);
 destroy_decompress_ctx:
 	if (cops->destroy_decompress_ctx)
 		cops->destroy_decompress_ctx(dic);
 out_free_dic:
 	if (verity)
-		refcount_set(&dic->ref, dic->nr_cpages);
+		atomic_set(&dic->pending_pages, dic->nr_cpages);
 	if (!verity)
 		f2fs_decompress_end_io(dic->rpages, dic->cluster_size,
 								ret, false);
@@ -1029,6 +1082,7 @@ bool f2fs_compress_write_end(struct inode *inode, void *fsdata,
 
 {
 	struct compress_ctx cc = {
+		.inode = inode,
 		.log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
 		.cluster_size = F2FS_I(inode)->i_cluster_size,
 		.rpages = fsdata,
@@ -1132,7 +1186,7 @@ static int f2fs_write_compressed_pages(struct compress_ctx *cc,
 		 */
 		down_read(&sbi->node_write);
 	} else if (!f2fs_trylock_op(sbi)) {
-		return -EAGAIN;
+		goto out_free;
 	}
 
 	set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
@@ -1155,15 +1209,14 @@ static int f2fs_write_compressed_pages(struct compress_ctx *cc,
 
 	fio.version = ni.version;
 
-	cic = f2fs_kzalloc(sbi, sizeof(struct compress_io_ctx), GFP_NOFS);
+	cic = kmem_cache_zalloc(cic_entry_slab, GFP_NOFS);
 	if (!cic)
 		goto out_put_dnode;
 
 	cic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
 	cic->inode = inode;
-	refcount_set(&cic->ref, cc->nr_cpages);
-	cic->rpages = f2fs_kzalloc(sbi, sizeof(struct page *) <<
-			cc->log_cluster_size, GFP_NOFS);
+	atomic_set(&cic->pending_pages, cc->nr_cpages);
+	cic->rpages = page_array_alloc(cc->inode, cc->cluster_size);
 	if (!cic->rpages)
 		goto out_put_cic;
 
@@ -1257,11 +1310,13 @@ unlock_continue:
 	spin_unlock(&fi->i_size_lock);
 
 	f2fs_put_rpages(cc);
+	page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
+	cc->cpages = NULL;
 	f2fs_destroy_compress_ctx(cc);
 	return 0;
 
 out_destroy_crypt:
-	kfree(cic->rpages);
+	page_array_free(cc->inode, cic->rpages, cc->cluster_size);
 
 	for (--i; i >= 0; i--)
 		fscrypt_finalize_bounce_page(&cc->cpages[i]);
@@ -1271,7 +1326,7 @@ out_destroy_crypt:
 		f2fs_put_page(cc->cpages[i], 1);
 	}
 out_put_cic:
-	kfree(cic);
+	kmem_cache_free(cic_entry_slab, cic);
 out_put_dnode:
 	f2fs_put_dnode(&dn);
 out_unlock_op:
@@ -1279,6 +1334,9 @@ out_unlock_op:
 		up_read(&sbi->node_write);
 	else
 		f2fs_unlock_op(sbi);
+out_free:
+	page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
+	cc->cpages = NULL;
 	return -EAGAIN;
 }
 
@@ -1296,7 +1354,7 @@ void f2fs_compress_write_end_io(struct bio *bio, struct page *page)
 
 	dec_page_count(sbi, F2FS_WB_DATA);
 
-	if (refcount_dec_not_one(&cic->ref))
+	if (atomic_dec_return(&cic->pending_pages))
 		return;
 
 	for (i = 0; i < cic->nr_rpages; i++) {
@@ -1305,8 +1363,8 @@ void f2fs_compress_write_end_io(struct bio *bio, struct page *page)
 		end_page_writeback(cic->rpages[i]);
 	}
 
-	kfree(cic->rpages);
-	kfree(cic);
+	page_array_free(cic->inode, cic->rpages, cic->nr_rpages);
+	kmem_cache_free(cic_entry_slab, cic);
 }
 
 static int f2fs_write_raw_pages(struct compress_ctx *cc,
@@ -1388,9 +1446,6 @@ int f2fs_write_multi_pages(struct compress_ctx *cc,
 					struct writeback_control *wbc,
 					enum iostat_type io_type)
 {
-	struct f2fs_inode_info *fi = F2FS_I(cc->inode);
-	const struct f2fs_compress_ops *cops =
-			f2fs_cops[fi->i_compress_algorithm];
 	int err;
 
 	*submitted = 0;
@@ -1405,9 +1460,6 @@ int f2fs_write_multi_pages(struct compress_ctx *cc,
 
 		err = f2fs_write_compressed_pages(cc, submitted,
 							wbc, io_type);
-		cops->destroy_compress_ctx(cc);
-		kfree(cc->cpages);
-		cc->cpages = NULL;
 		if (!err)
 			return 0;
 		f2fs_bug_on(F2FS_I_SB(cc->inode), err != -EAGAIN);
@@ -1424,25 +1476,23 @@ destroy_out:
 
 struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc)
 {
-	struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
 	struct decompress_io_ctx *dic;
 	pgoff_t start_idx = start_idx_of_cluster(cc);
 	int i;
 
-	dic = f2fs_kzalloc(sbi, sizeof(struct decompress_io_ctx), GFP_NOFS);
+	dic = kmem_cache_zalloc(dic_entry_slab, GFP_NOFS);
 	if (!dic)
 		return ERR_PTR(-ENOMEM);
 
-	dic->rpages = f2fs_kzalloc(sbi, sizeof(struct page *) <<
-			cc->log_cluster_size, GFP_NOFS);
+	dic->rpages = page_array_alloc(cc->inode, cc->cluster_size);
 	if (!dic->rpages) {
-		kfree(dic);
+		kmem_cache_free(dic_entry_slab, dic);
 		return ERR_PTR(-ENOMEM);
 	}
 
 	dic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
 	dic->inode = cc->inode;
-	refcount_set(&dic->ref, cc->nr_cpages);
+	atomic_set(&dic->pending_pages, cc->nr_cpages);
 	dic->cluster_idx = cc->cluster_idx;
 	dic->cluster_size = cc->cluster_size;
 	dic->log_cluster_size = cc->log_cluster_size;
@@ -1453,8 +1503,7 @@ struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc)
 		dic->rpages[i] = cc->rpages[i];
 	dic->nr_rpages = cc->cluster_size;
 
-	dic->cpages = f2fs_kzalloc(sbi, sizeof(struct page *) *
-					dic->nr_cpages, GFP_NOFS);
+	dic->cpages = page_array_alloc(dic->inode, dic->nr_cpages);
 	if (!dic->cpages)
 		goto out_free;
 
@@ -1489,7 +1538,7 @@ void f2fs_free_dic(struct decompress_io_ctx *dic)
 				continue;
 			f2fs_compress_free_page(dic->tpages[i]);
 		}
-		kfree(dic->tpages);
+		page_array_free(dic->inode, dic->tpages, dic->cluster_size);
 	}
 
 	if (dic->cpages) {
@@ -1498,11 +1547,11 @@ void f2fs_free_dic(struct decompress_io_ctx *dic)
 				continue;
 			f2fs_compress_free_page(dic->cpages[i]);
 		}
-		kfree(dic->cpages);
+		page_array_free(dic->inode, dic->cpages, dic->nr_cpages);
 	}
 
-	kfree(dic->rpages);
-	kfree(dic);
+	page_array_free(dic->inode, dic->rpages, dic->nr_rpages);
+	kmem_cache_free(dic_entry_slab, dic);
 }
 
 void f2fs_decompress_end_io(struct page **rpages,
@@ -1530,3 +1579,76 @@ unlock:
 		unlock_page(rpage);
 	}
 }
+
+int f2fs_init_page_array_cache(struct f2fs_sb_info *sbi)
+{
+	dev_t dev = sbi->sb->s_bdev->bd_dev;
+	char slab_name[32];
+
+	sprintf(slab_name, "f2fs_page_array_entry-%u:%u", MAJOR(dev), MINOR(dev));
+
+	sbi->page_array_slab_size = sizeof(struct page *) <<
+					F2FS_OPTION(sbi).compress_log_size;
+
+	sbi->page_array_slab = f2fs_kmem_cache_create(slab_name,
+					sbi->page_array_slab_size);
+	if (!sbi->page_array_slab)
+		return -ENOMEM;
+	return 0;
+}
+
+void f2fs_destroy_page_array_cache(struct f2fs_sb_info *sbi)
+{
+	kmem_cache_destroy(sbi->page_array_slab);
+}
+
+static int __init f2fs_init_cic_cache(void)
+{
+	cic_entry_slab = f2fs_kmem_cache_create("f2fs_cic_entry",
+					sizeof(struct compress_io_ctx));
+	if (!cic_entry_slab)
+		return -ENOMEM;
+	return 0;
+}
+
+static void f2fs_destroy_cic_cache(void)
+{
+	kmem_cache_destroy(cic_entry_slab);
+}
+
+static int __init f2fs_init_dic_cache(void)
+{
+	dic_entry_slab = f2fs_kmem_cache_create("f2fs_dic_entry",
+					sizeof(struct decompress_io_ctx));
+	if (!dic_entry_slab)
+		return -ENOMEM;
+	return 0;
+}
+
+static void f2fs_destroy_dic_cache(void)
+{
+	kmem_cache_destroy(dic_entry_slab);
+}
+
+int __init f2fs_init_compress_cache(void)
+{
+	int err;
+
+	err = f2fs_init_cic_cache();
+	if (err)
+		goto out;
+	err = f2fs_init_dic_cache();
+	if (err)
+		goto free_cic;
+	return 0;
+free_cic:
+	f2fs_destroy_cic_cache();
+out:
+	return -ENOMEM;
+}
+
+void f2fs_destroy_compress_cache(void)
+{
+	f2fs_destroy_dic_cache();
+	f2fs_destroy_cic_cache();
+}
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 73683e58a08d..be4da52604ed 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -202,7 +202,7 @@ static void f2fs_verify_bio(struct bio *bio)
 		dic = (struct decompress_io_ctx *)page_private(page);
 
 		if (dic) {
-			if (refcount_dec_not_one(&dic->ref))
+			if (atomic_dec_return(&dic->pending_pages))
 				continue;
 			f2fs_verify_pages(dic->rpages,
 						dic->cluster_size);
@@ -517,7 +517,7 @@ static inline void __submit_bio(struct f2fs_sb_info *sbi,
 
 			zero_user_segment(page, 0, PAGE_SIZE);
 			SetPagePrivate(page);
-			set_page_private(page, (unsigned long)DUMMY_WRITTEN_PAGE);
+			set_page_private(page, DUMMY_WRITTEN_PAGE);
 			lock_page(page);
 			if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE)
 				f2fs_bug_on(sbi, 1);
@@ -1416,7 +1416,7 @@ alloc:
 	set_summary(&sum, dn->nid, dn->ofs_in_node, ni.version);
 	old_blkaddr = dn->data_blkaddr;
 	f2fs_allocate_data_block(sbi, NULL, old_blkaddr, &dn->data_blkaddr,
-					&sum, seg_type, NULL);
+				&sum, seg_type, NULL);
 	if (GET_SEGNO(sbi, old_blkaddr) != NULL_SEGNO)
 		invalidate_mapping_pages(META_MAPPING(sbi),
 					old_blkaddr, old_blkaddr);
@@ -1803,10 +1803,6 @@ static int get_data_block_dio(struct inode *inode, sector_t iblock,
 static int get_data_block_bmap(struct inode *inode, sector_t iblock,
 			struct buffer_head *bh_result, int create)
 {
-	/* Block number less than F2FS MAX BLOCKS */
-	if (unlikely(iblock >= F2FS_I_SB(inode)->max_file_blocks))
-		return -EFBIG;
-
 	return __get_data_block(inode, iblock, bh_result, create,
 						F2FS_GET_BLOCK_BMAP, NULL,
 						NO_CHECK_TYPE, create);
@@ -2272,8 +2268,8 @@ submit_and_realloc:
 			if (IS_ERR(bio)) {
 				ret = PTR_ERR(bio);
 				dic->failed = true;
-				if (refcount_sub_and_test(dic->nr_cpages - i,
-							&dic->ref)) {
+				if (!atomic_sub_return(dic->nr_cpages - i,
+							&dic->pending_pages)) {
 					f2fs_decompress_end_io(dic->rpages,
 							cc->cluster_size, true,
 							false);
@@ -3133,6 +3129,8 @@ next:
 			retry = 0;
 		}
 	}
+	if (f2fs_compressed_file(inode))
+		f2fs_destroy_compress_ctx(&cc);
 #endif
 	if (retry) {
 		index = 0;
@@ -3574,7 +3572,7 @@ static void f2fs_dio_end_io(struct bio *bio)
 	bio->bi_private = dio->orig_private;
 	bio->bi_end_io = dio->orig_end_io;
 
-	kvfree(dio);
+	kfree(dio);
 
 	bio_endio(bio);
 }
@@ -3673,12 +3671,18 @@ static ssize_t f2fs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 									err);
 			if (!do_opu)
 				set_inode_flag(inode, FI_UPDATE_WRITE);
+		} else if (err == -EIOCBQUEUED) {
+			f2fs_update_iostat(F2FS_I_SB(inode), APP_DIRECT_IO,
+						count - iov_iter_count(iter));
 		} else if (err < 0) {
 			f2fs_write_failed(mapping, offset + count);
 		}
 	} else {
 		if (err > 0)
 			f2fs_update_iostat(sbi, APP_DIRECT_READ_IO, err);
+		else if (err == -EIOCBQUEUED)
+			f2fs_update_iostat(F2FS_I_SB(inode), APP_DIRECT_READ_IO,
+						count - iov_iter_count(iter));
 	}
 
 out:
@@ -3807,11 +3811,16 @@ static sector_t f2fs_bmap(struct address_space *mapping, sector_t block)
 	if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY))
 		filemap_write_and_wait(mapping);
 
-	if (f2fs_compressed_file(inode))
-		blknr = f2fs_bmap_compress(inode, block);
+	/* Block number less than F2FS MAX BLOCKS */
+	if (unlikely(block >= F2FS_I_SB(inode)->max_file_blocks))
+		goto out;
 
-	if (!get_data_block_bmap(inode, block, &tmp, 0))
-		blknr = tmp.b_blocknr;
+	if (f2fs_compressed_file(inode)) {
+		blknr = f2fs_bmap_compress(inode, block);
+	} else {
+		if (!get_data_block_bmap(inode, block, &tmp, 0))
+			blknr = tmp.b_blocknr;
+	}
 out:
 	trace_f2fs_bmap(inode, block, blknr);
 	return blknr;
@@ -3874,6 +3883,83 @@ int f2fs_migrate_page(struct address_space *mapping,
 #endif
 
 #ifdef CONFIG_SWAP
+static int check_swap_activate_fast(struct swap_info_struct *sis,
+				struct file *swap_file, sector_t *span)
+{
+	struct address_space *mapping = swap_file->f_mapping;
+	struct inode *inode = mapping->host;
+	sector_t cur_lblock;
+	sector_t last_lblock;
+	sector_t pblock;
+	sector_t lowest_pblock = -1;
+	sector_t highest_pblock = 0;
+	int nr_extents = 0;
+	unsigned long nr_pblocks;
+	unsigned long len;
+	int ret;
+
+	/*
+	 * Map all the blocks into the extent list.  This code doesn't try
+	 * to be very smart.
+	 */
+	cur_lblock = 0;
+	last_lblock = logical_to_blk(inode, i_size_read(inode));
+	len = i_size_read(inode);
+
+	while (cur_lblock <= last_lblock && cur_lblock < sis->max) {
+		struct buffer_head map_bh;
+		pgoff_t next_pgofs;
+
+		cond_resched();
+
+		memset(&map_bh, 0, sizeof(struct buffer_head));
+		map_bh.b_size = len - cur_lblock;
+
+		ret = get_data_block(inode, cur_lblock, &map_bh, 0,
+					F2FS_GET_BLOCK_FIEMAP, &next_pgofs);
+		if (ret)
+			goto err_out;
+
+		/* hole */
+		if (!buffer_mapped(&map_bh))
+			goto err_out;
+
+		pblock = map_bh.b_blocknr;
+		nr_pblocks = logical_to_blk(inode, map_bh.b_size);
+
+		if (cur_lblock + nr_pblocks >= sis->max)
+			nr_pblocks = sis->max - cur_lblock;
+
+		if (cur_lblock) {	/* exclude the header page */
+			if (pblock < lowest_pblock)
+				lowest_pblock = pblock;
+			if (pblock + nr_pblocks - 1 > highest_pblock)
+				highest_pblock = pblock + nr_pblocks - 1;
+		}
+
+		/*
+		 * We found a PAGE_SIZE-length, PAGE_SIZE-aligned run of blocks
+		 */
+		ret = add_swap_extent(sis, cur_lblock, nr_pblocks, pblock);
+		if (ret < 0)
+			goto out;
+		nr_extents += ret;
+		cur_lblock += nr_pblocks;
+	}
+	ret = nr_extents;
+	*span = 1 + highest_pblock - lowest_pblock;
+	if (cur_lblock == 0)
+		cur_lblock = 1;	/* force Empty message */
+	sis->max = cur_lblock;
+	sis->pages = cur_lblock - 1;
+	sis->highest_bit = cur_lblock - 1;
+out:
+	return ret;
+err_out:
+	pr_err("swapon: swapfile has holes\n");
+	return -EINVAL;
+}
+
 /* Copied from generic_swapfile_activate() to check any holes */
 static int check_swap_activate(struct swap_info_struct *sis,
 				struct file *swap_file, sector_t *span)
@@ -3890,6 +3976,9 @@ static int check_swap_activate(struct swap_info_struct *sis,
 	int nr_extents = 0;
 	int ret;
 
+	if (PAGE_SIZE == F2FS_BLKSIZE)
+		return check_swap_activate_fast(sis, swap_file, span);
+
 	blkbits = inode->i_blkbits;
 	blocks_per_page = PAGE_SIZE >> blkbits;
 
@@ -3989,7 +4078,7 @@ static int f2fs_swap_activate(struct swap_info_struct *sis, struct file *file,
 	if (ret)
 		return ret;
 
-	if (f2fs_disable_compressed_file(inode))
+	if (!f2fs_disable_compressed_file(inode))
 		return -EINVAL;
 
 	ret = check_swap_activate(sis, file, span);
diff --git a/fs/f2fs/debug.c b/fs/f2fs/debug.c
index 4276c0f79beb..a8357fd4f5fa 100644
--- a/fs/f2fs/debug.c
+++ b/fs/f2fs/debug.c
@@ -131,7 +131,7 @@ static void update_general_status(struct f2fs_sb_info *sbi)
 	si->inline_inode = atomic_read(&sbi->inline_inode);
 	si->inline_dir = atomic_read(&sbi->inline_dir);
 	si->compr_inode = atomic_read(&sbi->compr_inode);
-	si->compr_blocks = atomic_read(&sbi->compr_blocks);
+	si->compr_blocks = atomic64_read(&sbi->compr_blocks);
 	si->append = sbi->im[APPEND_INO].ino_num;
 	si->update = sbi->im[UPDATE_INO].ino_num;
 	si->orphans = sbi->im[ORPHAN_INO].ino_num;
@@ -164,7 +164,7 @@ static void update_general_status(struct f2fs_sb_info *sbi)
 		* 100 / (int)(sbi->user_block_count >> sbi->log_blocks_per_seg)
 		/ 2;
 	si->util_invalid = 50 - si->util_free - si->util_valid;
-	for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_NODE; i++) {
+	for (i = CURSEG_HOT_DATA; i < NO_CHECK_TYPE; i++) {
 		struct curseg_info *curseg = CURSEG_I(sbi, i);
 		si->curseg[i] = curseg->segno;
 		si->cursec[i] = GET_SEC_FROM_SEG(sbi, curseg->segno);
@@ -342,7 +342,7 @@ static int stat_show(struct seq_file *s, void *v)
 			   si->inline_inode);
 		seq_printf(s, "  - Inline_dentry Inode: %u\n",
 			   si->inline_dir);
-		seq_printf(s, "  - Compressed Inode: %u, Blocks: %u\n",
+		seq_printf(s, "  - Compressed Inode: %u, Blocks: %llu\n",
 			   si->compr_inode, si->compr_blocks);
 		seq_printf(s, "  - Orphan/Append/Update Inode: %u, %u, %u\n",
 			   si->orphans, si->append, si->update);
@@ -393,6 +393,14 @@ static int stat_show(struct seq_file *s, void *v)
 			   si->dirty_seg[CURSEG_COLD_NODE],
 			   si->full_seg[CURSEG_COLD_NODE],
 			   si->valid_blks[CURSEG_COLD_NODE]);
+		seq_printf(s, "  - Pinned file: %8d %8d %8d\n",
+			   si->curseg[CURSEG_COLD_DATA_PINNED],
+			   si->cursec[CURSEG_COLD_DATA_PINNED],
+			   si->curzone[CURSEG_COLD_DATA_PINNED]);
+		seq_printf(s, "  - ATGC   data: %8d %8d %8d\n",
+			   si->curseg[CURSEG_ALL_DATA_ATGC],
+			   si->cursec[CURSEG_ALL_DATA_ATGC],
+			   si->curzone[CURSEG_ALL_DATA_ATGC]);
 		seq_printf(s, "\n  - Valid: %d\n  - Dirty: %d\n",
 			   si->main_area_segs - si->dirty_count -
 			   si->prefree_count - si->free_segs,
@@ -542,7 +550,7 @@ int f2fs_build_stats(struct f2fs_sb_info *sbi)
 	atomic_set(&sbi->inline_inode, 0);
 	atomic_set(&sbi->inline_dir, 0);
 	atomic_set(&sbi->compr_inode, 0);
-	atomic_set(&sbi->compr_blocks, 0);
+	atomic64_set(&sbi->compr_blocks, 0);
 	atomic_set(&sbi->inplace_count, 0);
 	for (i = META_CP; i < META_MAX; i++)
 		atomic_set(&sbi->meta_count[i], 0);
@@ -566,7 +574,7 @@ void f2fs_destroy_stats(struct f2fs_sb_info *sbi)
 	list_del(&si->stat_list);
 	mutex_unlock(&f2fs_stat_mutex);
 
-	kvfree(si);
+	kfree(si);
 }
 
 void __init f2fs_create_root_stats(void)
diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index 53fbc4dd6e48..4b9ef8bbfa4a 100644
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -75,21 +75,22 @@ int f2fs_init_casefolded_name(const struct inode *dir,
 			      struct f2fs_filename *fname)
 {
 #ifdef CONFIG_UNICODE
-	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
+	struct super_block *sb = dir->i_sb;
+	struct f2fs_sb_info *sbi = F2FS_SB(sb);
 
 	if (IS_CASEFOLDED(dir)) {
 		fname->cf_name.name = f2fs_kmalloc(sbi, F2FS_NAME_LEN,
 						   GFP_NOFS);
 		if (!fname->cf_name.name)
 			return -ENOMEM;
-		fname->cf_name.len = utf8_casefold(sbi->s_encoding,
+		fname->cf_name.len = utf8_casefold(sb->s_encoding,
 						   fname->usr_fname,
 						   fname->cf_name.name,
 						   F2FS_NAME_LEN);
 		if ((int)fname->cf_name.len <= 0) {
 			kfree(fname->cf_name.name);
 			fname->cf_name.name = NULL;
-			if (f2fs_has_strict_mode(sbi))
+			if (sb_has_strict_encoding(sb))
 				return -EINVAL;
 			/* fall back to treating name as opaque byte sequence */
 		}
@@ -190,21 +191,15 @@ static unsigned long dir_block_index(unsigned int level,
 static struct f2fs_dir_entry *find_in_block(struct inode *dir,
 				struct page *dentry_page,
 				const struct f2fs_filename *fname,
-				int *max_slots,
-				struct page **res_page)
+				int *max_slots)
 {
 	struct f2fs_dentry_block *dentry_blk;
-	struct f2fs_dir_entry *de;
 	struct f2fs_dentry_ptr d;
 
 	dentry_blk = (struct f2fs_dentry_block *)page_address(dentry_page);
 
 	make_dentry_ptr_block(dir, &d, dentry_blk);
-	de = f2fs_find_target_dentry(&d, fname, max_slots);
-	if (de)
-		*res_page = dentry_page;
-
-	return de;
+	return f2fs_find_target_dentry(&d, fname, max_slots);
 }
 
 #ifdef CONFIG_UNICODE
@@ -215,8 +210,8 @@ static struct f2fs_dir_entry *find_in_block(struct inode *dir,
 static bool f2fs_match_ci_name(const struct inode *dir, const struct qstr *name,
 			       const u8 *de_name, u32 de_name_len)
 {
-	const struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
-	const struct unicode_map *um = sbi->s_encoding;
+	const struct super_block *sb = dir->i_sb;
+	const struct unicode_map *um = sb->s_encoding;
 	struct qstr entry = QSTR_INIT(de_name, de_name_len);
 	int res;
 
@@ -226,7 +221,7 @@ static bool f2fs_match_ci_name(const struct inode *dir, const struct qstr *name,
 		 * In strict mode, ignore invalid names.  In non-strict mode,
 		 * fall back to treating them as opaque byte sequences.
 		 */
-		if (f2fs_has_strict_mode(sbi) || name->len != entry.len)
+		if (sb_has_strict_encoding(sb) || name->len != entry.len)
 			return false;
 		return !memcmp(name->name, entry.name, name->len);
 	}
@@ -330,10 +325,11 @@ static struct f2fs_dir_entry *find_in_level(struct inode *dir,
 			}
 		}
 
-		de = find_in_block(dir, dentry_page, fname, &max_slots,
-				   res_page);
-		if (de)
+		de = find_in_block(dir, dentry_page, fname, &max_slots);
+		if (de) {
+			*res_page = dentry_page;
 			break;
+		}
 
 		if (max_slots >= s)
 			room = true;
@@ -357,16 +353,15 @@ struct f2fs_dir_entry *__f2fs_find_entry(struct inode *dir,
 	unsigned int max_depth;
 	unsigned int level;
 
+	*res_page = NULL;
+
 	if (f2fs_has_inline_dentry(dir)) {
-		*res_page = NULL;
 		de = f2fs_find_in_inline_dir(dir, fname, res_page);
 		goto out;
 	}
 
-	if (npages == 0) {
-		*res_page = NULL;
+	if (npages == 0)
 		goto out;
-	}
 
 	max_depth = F2FS_I(dir)->i_current_depth;
 	if (unlikely(max_depth > MAX_DIR_HASH_DEPTH)) {
@@ -377,7 +372,6 @@ struct f2fs_dir_entry *__f2fs_find_entry(struct inode *dir,
 	}
 
 	for (level = 0; level < max_depth; level++) {
-		*res_page = NULL;
 		de = find_in_level(dir, level, fname, res_page);
 		if (de || IS_ERR(*res_page))
 			break;
@@ -1107,75 +1101,8 @@ const struct file_operations f2fs_dir_operations = {
 };
 
 #ifdef CONFIG_UNICODE
-static int f2fs_d_compare(const struct dentry *dentry, unsigned int len,
-			  const char *str, const struct qstr *name)
-{
-	const struct dentry *parent = READ_ONCE(dentry->d_parent);
-	const struct inode *dir = READ_ONCE(parent->d_inode);
-	const struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
-	struct qstr entry = QSTR_INIT(str, len);
-	char strbuf[DNAME_INLINE_LEN];
-	int res;
-
-	if (!dir || !IS_CASEFOLDED(dir))
-		goto fallback;
-
-	/*
-	 * If the dentry name is stored in-line, then it may be concurrently
-	 * modified by a rename.  If this happens, the VFS will eventually retry
-	 * the lookup, so it doesn't matter what ->d_compare() returns.
-	 * However, it's unsafe to call utf8_strncasecmp() with an unstable
-	 * string.  Therefore, we have to copy the name into a temporary buffer.
-	 */
-	if (len <= DNAME_INLINE_LEN - 1) {
-		memcpy(strbuf, str, len);
-		strbuf[len] = 0;
-		entry.name = strbuf;
-		/* prevent compiler from optimizing out the temporary buffer */
-		barrier();
-	}
-
-	res = utf8_strncasecmp(sbi->s_encoding, name, &entry);
-	if (res >= 0)
-		return res;
-
-	if (f2fs_has_strict_mode(sbi))
-		return -EINVAL;
-fallback:
-	if (len != name->len)
-		return 1;
-	return !!memcmp(str, name->name, len);
-}
-
-static int f2fs_d_hash(const struct dentry *dentry, struct qstr *str)
-{
-	struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
-	const struct unicode_map *um = sbi->s_encoding;
-	const struct inode *inode = READ_ONCE(dentry->d_inode);
-	unsigned char *norm;
-	int len, ret = 0;
-
-	if (!inode || !IS_CASEFOLDED(inode))
-		return 0;
-
-	norm = f2fs_kmalloc(sbi, PATH_MAX, GFP_ATOMIC);
-	if (!norm)
-		return -ENOMEM;
-
-	len = utf8_casefold(um, str, norm, PATH_MAX);
-	if (len < 0) {
-		if (f2fs_has_strict_mode(sbi))
-			ret = -EINVAL;
-		goto out;
-	}
-	str->hash = full_name_hash(dentry, norm, len);
-out:
-	kvfree(norm);
-	return ret;
-}
-
 const struct dentry_operations f2fs_dentry_ops = {
-	.d_hash = f2fs_d_hash,
-	.d_compare = f2fs_d_compare,
+	.d_hash = generic_ci_d_hash,
+	.d_compare = generic_ci_d_compare,
 };
 #endif
diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c
index 686c68b98610..3ebf976a682d 100644
--- a/fs/f2fs/extent_cache.c
+++ b/fs/f2fs/extent_cache.c
@@ -58,6 +58,29 @@ struct rb_entry *f2fs_lookup_rb_tree(struct rb_root_cached *root,
 	return re;
 }
 
+struct rb_node **f2fs_lookup_rb_tree_ext(struct f2fs_sb_info *sbi,
+					struct rb_root_cached *root,
+					struct rb_node **parent,
+					unsigned long long key, bool *leftmost)
+{
+	struct rb_node **p = &root->rb_root.rb_node;
+	struct rb_entry *re;
+
+	while (*p) {
+		*parent = *p;
+		re = rb_entry(*parent, struct rb_entry, rb_node);
+
+		if (key < re->key) {
+			p = &(*p)->rb_left;
+		} else {
+			p = &(*p)->rb_right;
+			*leftmost = false;
+		}
+	}
+
+	return p;
+}
+
 struct rb_node **f2fs_lookup_rb_tree_for_insert(struct f2fs_sb_info *sbi,
 				struct rb_root_cached *root,
 				struct rb_node **parent,
@@ -166,7 +189,7 @@ lookup_neighbors:
 }
 
 bool f2fs_check_rb_tree_consistence(struct f2fs_sb_info *sbi,
-						struct rb_root_cached *root)
+				struct rb_root_cached *root, bool check_key)
 {
 #ifdef CONFIG_F2FS_CHECK_FS
 	struct rb_node *cur = rb_first_cached(root), *next;
@@ -183,13 +206,23 @@ bool f2fs_check_rb_tree_consistence(struct f2fs_sb_info *sbi,
 		cur_re = rb_entry(cur, struct rb_entry, rb_node);
 		next_re = rb_entry(next, struct rb_entry, rb_node);
 
+		if (check_key) {
+			if (cur_re->key > next_re->key) {
+				f2fs_info(sbi, "inconsistent rbtree, "
+					"cur(%llu) next(%llu)",
+					cur_re->key, next_re->key);
+				return false;
+			}
+			goto next;
+		}
+
 		if (cur_re->ofs + cur_re->len > next_re->ofs) {
 			f2fs_info(sbi, "inconsistent rbtree, cur(%u, %u) next(%u, %u)",
 				  cur_re->ofs, cur_re->len,
 				  next_re->ofs, next_re->len);
 			return false;
 		}
-
+next:
 		cur = next;
 	}
 #endif
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 7c089ff7ff94..cb700d797296 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -98,6 +98,7 @@ extern const char *f2fs_fault_name[FAULT_MAX];
 #define F2FS_MOUNT_RESERVE_ROOT		0x01000000
 #define F2FS_MOUNT_DISABLE_CHECKPOINT	0x02000000
 #define F2FS_MOUNT_NORECOVERY		0x04000000
+#define F2FS_MOUNT_ATGC			0x08000000
 
 #define F2FS_OPTION(sbi)	((sbi)->mount_opt)
 #define clear_opt(sbi, option)	(F2FS_OPTION(sbi).opt &= ~F2FS_MOUNT_##option)
@@ -612,8 +613,13 @@ enum {
 
 struct rb_entry {
 	struct rb_node rb_node;		/* rb node located in rb-tree */
-	unsigned int ofs;		/* start offset of the entry */
-	unsigned int len;		/* length of the entry */
+	union {
+		struct {
+			unsigned int ofs;	/* start offset of the entry */
+			unsigned int len;	/* length of the entry */
+		};
+		unsigned long long key;		/* 64-bits key */
+	} __packed;
 };
 
 struct extent_info {
@@ -801,7 +807,7 @@ struct f2fs_inode_info {
 	struct timespec64 i_disk_time[4];/* inode disk times */
 
 	/* for file compress */
-	u64 i_compr_blocks;			/* # of compressed blocks */
+	atomic_t i_compr_blocks;		/* # of compressed blocks */
 	unsigned char i_compress_algorithm;	/* algorithm type */
 	unsigned char i_log_cluster_size;	/* log of cluster size */
 	unsigned int i_cluster_size;		/* cluster size */
@@ -973,7 +979,9 @@ static inline void set_new_dnode(struct dnode_of_data *dn, struct inode *inode,
  */
 #define	NR_CURSEG_DATA_TYPE	(3)
 #define NR_CURSEG_NODE_TYPE	(3)
-#define NR_CURSEG_TYPE	(NR_CURSEG_DATA_TYPE + NR_CURSEG_NODE_TYPE)
+#define NR_CURSEG_INMEM_TYPE	(2)
+#define NR_CURSEG_PERSIST_TYPE	(NR_CURSEG_DATA_TYPE + NR_CURSEG_NODE_TYPE)
+#define NR_CURSEG_TYPE		(NR_CURSEG_INMEM_TYPE + NR_CURSEG_PERSIST_TYPE)
 
 enum {
 	CURSEG_HOT_DATA	= 0,	/* directory entry blocks */
@@ -982,8 +990,11 @@ enum {
 	CURSEG_HOT_NODE,	/* direct node blocks of directory files */
 	CURSEG_WARM_NODE,	/* direct node blocks of normal files */
 	CURSEG_COLD_NODE,	/* indirect node blocks */
-	NO_CHECK_TYPE,
-	CURSEG_COLD_DATA_PINNED,/* cold data for pinned file */
+	NR_PERSISTENT_LOG,	/* number of persistent log */
+	CURSEG_COLD_DATA_PINNED = NR_PERSISTENT_LOG,
+				/* pinned file that needs consecutive block address */
+	CURSEG_ALL_DATA_ATGC,	/* SSR alloctor in hot/warm/cold data area */
+	NO_CHECK_TYPE,		/* number of persistent & inmem log */
 };
 
 struct flush_cmd {
@@ -1209,6 +1220,7 @@ struct f2fs_dev_info {
 #ifdef CONFIG_BLK_DEV_ZONED
 	unsigned int nr_blkz;		/* Total number of zones */
 	unsigned long *blkz_seq;	/* Bitmap indicating sequential zones */
+	block_t *zone_capacity_blocks;  /* Array of zone capacity in blks */
 #endif
 };
 
@@ -1228,6 +1240,18 @@ struct inode_management {
 	unsigned long ino_num;			/* number of entries */
 };
 
+/* for GC_AT */
+struct atgc_management {
+	bool atgc_enabled;			/* ATGC is enabled or not */
+	struct rb_root_cached root;		/* root of victim rb-tree */
+	struct list_head victim_list;		/* linked with all victim entries */
+	unsigned int victim_count;		/* victim count in rb-tree */
+	unsigned int candidate_ratio;		/* candidate ratio */
+	unsigned int max_candidate_count;	/* max candidate count */
+	unsigned int age_weight;		/* age weight, vblock_weight = 100 - age_weight */
+	unsigned long long age_threshold;	/* age threshold */
+};
+
 /* For s_flag in struct f2fs_sb_info */
 enum {
 	SBI_IS_DIRTY,				/* dirty flag for checkpoint */
@@ -1260,6 +1284,7 @@ enum {
 	GC_NORMAL,
 	GC_IDLE_CB,
 	GC_IDLE_GREEDY,
+	GC_IDLE_AT,
 	GC_URGENT_HIGH,
 	GC_URGENT_LOW,
 };
@@ -1303,9 +1328,9 @@ enum fsync_mode {
 #define DUMMY_WRITTEN_PAGE		((unsigned long)-2)
 
 #define IS_ATOMIC_WRITTEN_PAGE(page)			\
-		(page_private(page) == (unsigned long)ATOMIC_WRITTEN_PAGE)
+		(page_private(page) == ATOMIC_WRITTEN_PAGE)
 #define IS_DUMMY_WRITTEN_PAGE(page)			\
-		(page_private(page) == (unsigned long)DUMMY_WRITTEN_PAGE)
+		(page_private(page) == DUMMY_WRITTEN_PAGE)
 
 #ifdef CONFIG_F2FS_IO_TRACE
 #define IS_IO_TRACED_PAGE(page)			\
@@ -1359,7 +1384,7 @@ struct compress_io_ctx {
 	struct inode *inode;		/* inode the context belong to */
 	struct page **rpages;		/* pages store raw data in cluster */
 	unsigned int nr_rpages;		/* total page number in rpages */
-	refcount_t ref;			/* referrence count of raw page */
+	atomic_t pending_pages;		/* in-flight compressed page count */
 };
 
 /* decompress io context for read IO path */
@@ -1378,7 +1403,7 @@ struct decompress_io_ctx {
 	struct compress_data *cbuf;	/* virtual mapped address on cpages */
 	size_t rlen;			/* valid data length in rbuf */
 	size_t clen;			/* valid data length in cbuf */
-	refcount_t ref;			/* referrence count of compressed page */
+	atomic_t pending_pages;		/* in-flight compressed page count */
 	bool failed;			/* indicate IO error during decompression */
 	void *private;			/* payload buffer for specified decompression algorithm */
 	void *private2;			/* extra payload buffer */
@@ -1387,7 +1412,7 @@ struct decompress_io_ctx {
 #define NULL_CLUSTER			((unsigned int)(~0))
 #define MIN_COMPRESS_LOG_SIZE		2
 #define MAX_COMPRESS_LOG_SIZE		8
-#define MAX_COMPRESS_WINDOW_SIZE	((PAGE_SIZE) << MAX_COMPRESS_LOG_SIZE)
+#define MAX_COMPRESS_WINDOW_SIZE(log_size)	((PAGE_SIZE) << (log_size))
 
 struct f2fs_sb_info {
 	struct super_block *sb;			/* pointer to VFS super block */
@@ -1397,10 +1422,6 @@ struct f2fs_sb_info {
 	int valid_super_block;			/* valid super block no */
 	unsigned long s_flag;				/* flags for sbi */
 	struct mutex writepages;		/* mutex for writepages() */
-#ifdef CONFIG_UNICODE
-	struct unicode_map *s_encoding;
-	__u16 s_encoding_flags;
-#endif
 
 #ifdef CONFIG_BLK_DEV_ZONED
 	unsigned int blocks_per_blkz;		/* F2FS blocks per zone */
@@ -1508,6 +1529,7 @@ struct f2fs_sb_info {
 						 * race between GC and GC or CP
 						 */
 	struct f2fs_gc_kthread	*gc_thread;	/* GC thread */
+	struct atgc_management am;		/* atgc management */
 	unsigned int cur_victim_sec;		/* current victim section num */
 	unsigned int gc_mode;			/* current GC state */
 	unsigned int next_victim_seg[2];	/* next segment in victim section */
@@ -1544,7 +1566,7 @@ struct f2fs_sb_info {
 	atomic_t inline_inode;			/* # of inline_data inodes */
 	atomic_t inline_dir;			/* # of inline_dentry inodes */
 	atomic_t compr_inode;			/* # of compressed inodes */
-	atomic_t compr_blocks;			/* # of compressed blocks */
+	atomic64_t compr_blocks;		/* # of compressed blocks */
 	atomic_t vw_cnt;			/* # of volatile writes */
 	atomic_t max_aw_cnt;			/* max # of atomic writes */
 	atomic_t max_vw_cnt;			/* max # of volatile writes */
@@ -1593,6 +1615,11 @@ struct f2fs_sb_info {
 
 	struct kmem_cache *inline_xattr_slab;	/* inline xattr entry */
 	unsigned int inline_xattr_slab_size;	/* default inline xattr slab size */
+
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+	struct kmem_cache *page_array_slab;	/* page array entry */
+	unsigned int page_array_slab_size;	/* default page array slab size */
+#endif
 };
 
 struct f2fs_private_dio {
@@ -3325,6 +3352,11 @@ block_t f2fs_get_unusable_blocks(struct f2fs_sb_info *sbi);
 int f2fs_disable_cp_again(struct f2fs_sb_info *sbi, block_t unusable);
 void f2fs_release_discard_addrs(struct f2fs_sb_info *sbi);
 int f2fs_npages_for_summary_flush(struct f2fs_sb_info *sbi, bool for_ra);
+void f2fs_init_inmem_curseg(struct f2fs_sb_info *sbi);
+void f2fs_save_inmem_curseg(struct f2fs_sb_info *sbi);
+void f2fs_restore_inmem_curseg(struct f2fs_sb_info *sbi);
+void f2fs_get_new_segment(struct f2fs_sb_info *sbi,
+			unsigned int *newseg, bool new_sec, int dir);
 void f2fs_allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type,
 					unsigned int start, unsigned int end);
 void f2fs_allocate_new_segment(struct f2fs_sb_info *sbi, int type);
@@ -3343,7 +3375,8 @@ void f2fs_outplace_write_data(struct dnode_of_data *dn,
 int f2fs_inplace_write_data(struct f2fs_io_info *fio);
 void f2fs_do_replace_block(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
 			block_t old_blkaddr, block_t new_blkaddr,
-			bool recover_curseg, bool recover_newaddr);
+			bool recover_curseg, bool recover_newaddr,
+			bool from_gc);
 void f2fs_replace_block(struct f2fs_sb_info *sbi, struct dnode_of_data *dn,
 			block_t old_addr, block_t new_addr,
 			unsigned char version, bool recover_curseg,
@@ -3371,6 +3404,10 @@ void f2fs_destroy_segment_manager_caches(void);
 int f2fs_rw_hint_to_seg_type(enum rw_hint hint);
 enum rw_hint f2fs_io_type_to_rw_hint(struct f2fs_sb_info *sbi,
 			enum page_type type, enum temp_type temp);
+unsigned int f2fs_usable_segs_in_sec(struct f2fs_sb_info *sbi,
+			unsigned int segno);
+unsigned int f2fs_usable_blks_in_seg(struct f2fs_sb_info *sbi,
+			unsigned int segno);
 
 /*
  * checkpoint.c
@@ -3378,7 +3415,7 @@ enum rw_hint f2fs_io_type_to_rw_hint(struct f2fs_sb_info *sbi,
 void f2fs_stop_checkpoint(struct f2fs_sb_info *sbi, bool end_io);
 struct page *f2fs_grab_meta_page(struct f2fs_sb_info *sbi, pgoff_t index);
 struct page *f2fs_get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index);
-struct page *f2fs_get_meta_page_nofail(struct f2fs_sb_info *sbi, pgoff_t index);
+struct page *f2fs_get_meta_page_retry(struct f2fs_sb_info *sbi, pgoff_t index);
 struct page *f2fs_get_tmp_page(struct f2fs_sb_info *sbi, pgoff_t index);
 bool f2fs_is_valid_blkaddr(struct f2fs_sb_info *sbi,
 					block_t blkaddr, int type);
@@ -3486,6 +3523,8 @@ int f2fs_gc(struct f2fs_sb_info *sbi, bool sync, bool background,
 			unsigned int segno);
 void f2fs_build_gc_manager(struct f2fs_sb_info *sbi);
 int f2fs_resize_fs(struct f2fs_sb_info *sbi, __u64 block_count);
+int __init f2fs_create_garbage_collection_cache(void);
+void f2fs_destroy_garbage_collection_cache(void);
 
 /*
  * recovery.c
@@ -3521,7 +3560,8 @@ struct f2fs_stat_info {
 	int nr_discard_cmd;
 	unsigned int undiscard_blks;
 	int inline_xattr, inline_inode, inline_dir, append, update, orphans;
-	int compr_inode, compr_blocks;
+	int compr_inode;
+	unsigned long long compr_blocks;
 	int aw_cnt, max_aw_cnt, vw_cnt, max_vw_cnt;
 	unsigned int valid_count, valid_node_count, valid_inode_count, discard_blks;
 	unsigned int bimodal, avg_vblocks;
@@ -3606,9 +3646,9 @@ static inline struct f2fs_stat_info *F2FS_STAT(struct f2fs_sb_info *sbi)
 			(atomic_dec(&F2FS_I_SB(inode)->compr_inode));	\
 	} while (0)
 #define stat_add_compr_blocks(inode, blocks)				\
-		(atomic_add(blocks, &F2FS_I_SB(inode)->compr_blocks))
+		(atomic64_add(blocks, &F2FS_I_SB(inode)->compr_blocks))
 #define stat_sub_compr_blocks(inode, blocks)				\
-		(atomic_sub(blocks, &F2FS_I_SB(inode)->compr_blocks))
+		(atomic64_sub(blocks, &F2FS_I_SB(inode)->compr_blocks))
 #define stat_inc_meta_count(sbi, blkaddr)				\
 	do {								\
 		if (blkaddr < SIT_I(sbi)->sit_base_addr)		\
@@ -3787,6 +3827,10 @@ void f2fs_leave_shrinker(struct f2fs_sb_info *sbi);
  */
 struct rb_entry *f2fs_lookup_rb_tree(struct rb_root_cached *root,
 				struct rb_entry *cached_re, unsigned int ofs);
+struct rb_node **f2fs_lookup_rb_tree_ext(struct f2fs_sb_info *sbi,
+				struct rb_root_cached *root,
+				struct rb_node **parent,
+				unsigned long long key, bool *left_most);
 struct rb_node **f2fs_lookup_rb_tree_for_insert(struct f2fs_sb_info *sbi,
 				struct rb_root_cached *root,
 				struct rb_node **parent,
@@ -3797,7 +3841,7 @@ struct rb_entry *f2fs_lookup_rb_tree_ret(struct rb_root_cached *root,
 		struct rb_node ***insert_p, struct rb_node **insert_parent,
 		bool force, bool *leftmost);
 bool f2fs_check_rb_tree_consistence(struct f2fs_sb_info *sbi,
-						struct rb_root_cached *root);
+				struct rb_root_cached *root, bool check_key);
 unsigned int f2fs_shrink_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink);
 void f2fs_init_extent_tree(struct inode *inode, struct page *ipage);
 void f2fs_drop_extent_tree(struct inode *inode);
@@ -3883,6 +3927,10 @@ void f2fs_decompress_end_io(struct page **rpages,
 int f2fs_init_compress_ctx(struct compress_ctx *cc);
 void f2fs_destroy_compress_ctx(struct compress_ctx *cc);
 void f2fs_init_compress_info(struct f2fs_sb_info *sbi);
+int f2fs_init_page_array_cache(struct f2fs_sb_info *sbi);
+void f2fs_destroy_page_array_cache(struct f2fs_sb_info *sbi);
+int __init f2fs_init_compress_cache(void);
+void f2fs_destroy_compress_cache(void);
 #else
 static inline bool f2fs_is_compressed_page(struct page *page) { return false; }
 static inline bool f2fs_is_compress_backend_ready(struct inode *inode)
@@ -3899,6 +3947,10 @@ static inline struct page *f2fs_compress_control_page(struct page *page)
 }
 static inline int f2fs_init_compress_mempool(void) { return 0; }
 static inline void f2fs_destroy_compress_mempool(void) { }
+static inline int f2fs_init_page_array_cache(struct f2fs_sb_info *sbi) { return 0; }
+static inline void f2fs_destroy_page_array_cache(struct f2fs_sb_info *sbi) { }
+static inline int __init f2fs_init_compress_cache(void) { return 0; }
+static inline void f2fs_destroy_compress_cache(void) { }
 #endif
 
 static inline void set_compress_context(struct inode *inode)
@@ -3917,24 +3969,21 @@ static inline void set_compress_context(struct inode *inode)
 	f2fs_mark_inode_dirty_sync(inode, true);
 }
 
-static inline u64 f2fs_disable_compressed_file(struct inode *inode)
+static inline bool f2fs_disable_compressed_file(struct inode *inode)
 {
 	struct f2fs_inode_info *fi = F2FS_I(inode);
 
 	if (!f2fs_compressed_file(inode))
-		return 0;
-	if (S_ISREG(inode->i_mode)) {
-		if (get_dirty_pages(inode))
-			return 1;
-		if (fi->i_compr_blocks)
-			return fi->i_compr_blocks;
-	}
+		return true;
+	if (S_ISREG(inode->i_mode) &&
+		(get_dirty_pages(inode) || atomic_read(&fi->i_compr_blocks)))
+		return false;
 
 	fi->i_flags &= ~F2FS_COMPR_FL;
 	stat_dec_compr_inode(inode);
 	clear_inode_flag(inode, FI_COMPRESSED_FILE);
 	f2fs_mark_inode_dirty_sync(inode, true);
-	return 0;
+	return true;
 }
 
 #define F2FS_FEATURE_FUNCS(name, flagname) \
@@ -4028,16 +4077,17 @@ static inline void f2fs_i_compr_blocks_update(struct inode *inode,
 						u64 blocks, bool add)
 {
 	int diff = F2FS_I(inode)->i_cluster_size - blocks;
+	struct f2fs_inode_info *fi = F2FS_I(inode);
 
 	/* don't update i_compr_blocks if saved blocks were released */
-	if (!add && !F2FS_I(inode)->i_compr_blocks)
+	if (!add && !atomic_read(&fi->i_compr_blocks))
 		return;
 
 	if (add) {
-		F2FS_I(inode)->i_compr_blocks += diff;
+		atomic_add(diff, &fi->i_compr_blocks);
 		stat_add_compr_blocks(inode, diff);
 	} else {
-		F2FS_I(inode)->i_compr_blocks -= diff;
+		atomic_sub(diff, &fi->i_compr_blocks);
 		stat_sub_compr_blocks(inode, diff);
 	}
 	f2fs_mark_inode_dirty_sync(inode, true);
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 8a422400e824..ee861c6d9ff0 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -376,32 +376,15 @@ int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
 	return f2fs_do_sync_file(file, start, end, datasync, false);
 }
 
-static pgoff_t __get_first_dirty_index(struct address_space *mapping,
-						pgoff_t pgofs, int whence)
-{
-	struct page *page;
-	int nr_pages;
-
-	if (whence != SEEK_DATA)
-		return 0;
-
-	/* find first dirty page index */
-	nr_pages = find_get_pages_tag(mapping, &pgofs, PAGECACHE_TAG_DIRTY,
-				      1, &page);
-	if (!nr_pages)
-		return ULONG_MAX;
-	pgofs = page->index;
-	put_page(page);
-	return pgofs;
-}
-
-static bool __found_offset(struct f2fs_sb_info *sbi, block_t blkaddr,
-				pgoff_t dirty, pgoff_t pgofs, int whence)
+static bool __found_offset(struct address_space *mapping, block_t blkaddr,
+				pgoff_t index, int whence)
 {
 	switch (whence) {
 	case SEEK_DATA:
-		if ((blkaddr == NEW_ADDR && dirty == pgofs) ||
-			__is_valid_data_blkaddr(blkaddr))
+		if (__is_valid_data_blkaddr(blkaddr))
+			return true;
+		if (blkaddr == NEW_ADDR &&
+		    xa_get_mark(&mapping->i_pages, index, PAGECACHE_TAG_DIRTY))
 			return true;
 		break;
 	case SEEK_HOLE:
@@ -417,7 +400,7 @@ static loff_t f2fs_seek_block(struct file *file, loff_t offset, int whence)
 	struct inode *inode = file->f_mapping->host;
 	loff_t maxbytes = inode->i_sb->s_maxbytes;
 	struct dnode_of_data dn;
-	pgoff_t pgofs, end_offset, dirty;
+	pgoff_t pgofs, end_offset;
 	loff_t data_ofs = offset;
 	loff_t isize;
 	int err = 0;
@@ -429,16 +412,13 @@ static loff_t f2fs_seek_block(struct file *file, loff_t offset, int whence)
 		goto fail;
 
 	/* handle inline data case */
-	if (f2fs_has_inline_data(inode) || f2fs_has_inline_dentry(inode)) {
-		if (whence == SEEK_HOLE)
-			data_ofs = isize;
+	if (f2fs_has_inline_data(inode) && whence == SEEK_HOLE) {
+		data_ofs = isize;
 		goto found;
 	}
 
 	pgofs = (pgoff_t)(offset >> PAGE_SHIFT);
 
-	dirty = __get_first_dirty_index(inode->i_mapping, pgofs, whence);
-
 	for (; data_ofs < isize; data_ofs = (loff_t)pgofs << PAGE_SHIFT) {
 		set_new_dnode(&dn, inode, NULL, NULL, 0);
 		err = f2fs_get_dnode_of_data(&dn, pgofs, LOOKUP_NODE);
@@ -471,7 +451,7 @@ static loff_t f2fs_seek_block(struct file *file, loff_t offset, int whence)
 				goto fail;
 			}
 
-			if (__found_offset(F2FS_I_SB(inode), blkaddr, dirty,
+			if (__found_offset(file->f_mapping, blkaddr,
 							pgofs, whence)) {
 				f2fs_put_dnode(&dn);
 				goto found;
@@ -564,7 +544,7 @@ void f2fs_truncate_data_blocks_range(struct dnode_of_data *dn, int count)
 	bool compressed_cluster = false;
 	int cluster_index = 0, valid_blocks = 0;
 	int cluster_size = F2FS_I(dn->inode)->i_cluster_size;
-	bool released = !F2FS_I(dn->inode)->i_compr_blocks;
+	bool released = !atomic_read(&F2FS_I(dn->inode)->i_compr_blocks);
 
 	if (IS_INODE(dn->node_page) && f2fs_has_extra_attr(dn->inode))
 		base = get_extra_isize(dn->inode);
@@ -753,11 +733,14 @@ int f2fs_truncate_blocks(struct inode *inode, u64 from, bool lock)
 		return err;
 
 #ifdef CONFIG_F2FS_FS_COMPRESSION
-	if (from != free_from)
+	if (from != free_from) {
 		err = f2fs_truncate_partial_cluster(inode, from, lock);
+		if (err)
+			return err;
+	}
 #endif
 
-	return err;
+	return 0;
 }
 
 int f2fs_truncate(struct inode *inode)
@@ -1656,13 +1639,14 @@ next_alloc:
 		}
 
 		down_write(&sbi->pin_sem);
-		map.m_seg_type = CURSEG_COLD_DATA_PINNED;
 
 		f2fs_lock_op(sbi);
-		f2fs_allocate_new_segment(sbi, CURSEG_COLD_DATA);
+		f2fs_allocate_new_segment(sbi, CURSEG_COLD_DATA_PINNED);
 		f2fs_unlock_op(sbi);
 
+		map.m_seg_type = CURSEG_COLD_DATA_PINNED;
 		err = f2fs_map_blocks(inode, &map, 1, F2FS_GET_BLOCK_PRE_DIO);
+
 		up_write(&sbi->pin_sem);
 
 		done += map.m_len;
@@ -1828,7 +1812,7 @@ static int f2fs_setflags_common(struct inode *inode, u32 iflags, u32 mask)
 
 	if ((iflags ^ masked_flags) & F2FS_COMPR_FL) {
 		if (masked_flags & F2FS_COMPR_FL) {
-			if (f2fs_disable_compressed_file(inode))
+			if (!f2fs_disable_compressed_file(inode))
 				return -EINVAL;
 		}
 		if (iflags & F2FS_NOCOMP_FL)
@@ -1836,6 +1820,8 @@ static int f2fs_setflags_common(struct inode *inode, u32 iflags, u32 mask)
 		if (iflags & F2FS_COMPR_FL) {
 			if (!f2fs_may_compress(inode))
 				return -EINVAL;
+			if (S_ISREG(inode->i_mode) && inode->i_size)
+				return -EINVAL;
 
 			set_compress_context(inode);
 		}
@@ -2783,6 +2769,9 @@ static int f2fs_move_file_range(struct file *file_in, loff_t pos_in,
 	if (IS_ENCRYPTED(src) || IS_ENCRYPTED(dst))
 		return -EOPNOTSUPP;
 
+	if (pos_out < 0 || pos_in < 0)
+		return -EINVAL;
+
 	if (src == dst) {
 		if (pos_in == pos_out)
 			return 0;
@@ -3258,7 +3247,7 @@ static int f2fs_ioc_set_pin_file(struct file *filp, unsigned long arg)
 	if (ret)
 		goto out;
 
-	if (f2fs_disable_compressed_file(inode)) {
+	if (!f2fs_disable_compressed_file(inode)) {
 		ret = -EOPNOTSUPP;
 		goto out;
 	}
@@ -3385,7 +3374,7 @@ static int f2fs_ioc_getfslabel(struct file *filp, unsigned long arg)
 				min(FSLABEL_MAX, count)))
 		err = -EFAULT;
 
-	kvfree(vbuf);
+	kfree(vbuf);
 	return err;
 }
 
@@ -3436,7 +3425,7 @@ static int f2fs_get_compress_blocks(struct file *filp, unsigned long arg)
 	if (!f2fs_compressed_file(inode))
 		return -EINVAL;
 
-	blocks = F2FS_I(inode)->i_compr_blocks;
+	blocks = atomic_read(&F2FS_I(inode)->i_compr_blocks);
 	return put_user(blocks, (u64 __user *)arg);
 }
 
@@ -3521,7 +3510,8 @@ static int f2fs_release_compress_blocks(struct file *filp, unsigned long arg)
 	inode_lock(inode);
 
 	writecount = atomic_read(&inode->i_writecount);
-	if ((filp->f_mode & FMODE_WRITE && writecount != 1) || writecount) {
+	if ((filp->f_mode & FMODE_WRITE && writecount != 1) ||
+			(!(filp->f_mode & FMODE_WRITE) && writecount)) {
 		ret = -EBUSY;
 		goto out;
 	}
@@ -3540,7 +3530,7 @@ static int f2fs_release_compress_blocks(struct file *filp, unsigned long arg)
 	inode->i_ctime = current_time(inode);
 	f2fs_mark_inode_dirty_sync(inode, true);
 
-	if (!F2FS_I(inode)->i_compr_blocks)
+	if (!atomic_read(&F2FS_I(inode)->i_compr_blocks))
 		goto out;
 
 	down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
@@ -3588,14 +3578,15 @@ out:
 
 	if (ret >= 0) {
 		ret = put_user(released_blocks, (u64 __user *)arg);
-	} else if (released_blocks && F2FS_I(inode)->i_compr_blocks) {
+	} else if (released_blocks &&
+			atomic_read(&F2FS_I(inode)->i_compr_blocks)) {
 		set_sbi_flag(sbi, SBI_NEED_FSCK);
 		f2fs_warn(sbi, "%s: partial blocks were released i_ino=%lx "
-			"iblocks=%llu, released=%u, compr_blocks=%llu, "
+			"iblocks=%llu, released=%u, compr_blocks=%u, "
 			"run fsck to fix.",
 			__func__, inode->i_ino, inode->i_blocks,
 			released_blocks,
-			F2FS_I(inode)->i_compr_blocks);
+			atomic_read(&F2FS_I(inode)->i_compr_blocks));
 	}
 
 	return ret;
@@ -3683,7 +3674,7 @@ static int f2fs_reserve_compress_blocks(struct file *filp, unsigned long arg)
 	if (ret)
 		return ret;
 
-	if (F2FS_I(inode)->i_compr_blocks)
+	if (atomic_read(&F2FS_I(inode)->i_compr_blocks))
 		goto out;
 
 	f2fs_balance_fs(F2FS_I_SB(inode), true);
@@ -3747,14 +3738,15 @@ out:
 
 	if (ret >= 0) {
 		ret = put_user(reserved_blocks, (u64 __user *)arg);
-	} else if (reserved_blocks && F2FS_I(inode)->i_compr_blocks) {
+	} else if (reserved_blocks &&
+			atomic_read(&F2FS_I(inode)->i_compr_blocks)) {
 		set_sbi_flag(sbi, SBI_NEED_FSCK);
 		f2fs_warn(sbi, "%s: partial blocks were released i_ino=%lx "
-			"iblocks=%llu, reserved=%u, compr_blocks=%llu, "
+			"iblocks=%llu, reserved=%u, compr_blocks=%u, "
 			"run fsck to fix.",
 			__func__, inode->i_ino, inode->i_blocks,
 			reserved_blocks,
-			F2FS_I(inode)->i_compr_blocks);
+			atomic_read(&F2FS_I(inode)->i_compr_blocks));
 	}
 
 	return ret;
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 11b4adde9baf..05641a1e36cc 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -21,6 +21,8 @@
 #include "gc.h"
 #include <trace/events/f2fs.h>
 
+static struct kmem_cache *victim_entry_slab;
+
 static unsigned int count_bits(const unsigned long *addr,
 				unsigned int offset, unsigned int len);
 
@@ -150,7 +152,7 @@ int f2fs_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);
-		kvfree(gc_th);
+		kfree(gc_th);
 		sbi->gc_thread = NULL;
 	}
 out:
@@ -163,13 +165,22 @@ void f2fs_stop_gc_thread(struct f2fs_sb_info *sbi)
 	if (!gc_th)
 		return;
 	kthread_stop(gc_th->f2fs_gc_task);
-	kvfree(gc_th);
+	kfree(gc_th);
 	sbi->gc_thread = NULL;
 }
 
 static int select_gc_type(struct f2fs_sb_info *sbi, int gc_type)
 {
-	int gc_mode = (gc_type == BG_GC) ? GC_CB : GC_GREEDY;
+	int gc_mode;
+
+	if (gc_type == BG_GC) {
+		if (sbi->am.atgc_enabled)
+			gc_mode = GC_AT;
+		else
+			gc_mode = GC_CB;
+	} else {
+		gc_mode = GC_GREEDY;
+	}
 
 	switch (sbi->gc_mode) {
 	case GC_IDLE_CB:
@@ -179,7 +190,11 @@ static int select_gc_type(struct f2fs_sb_info *sbi, int gc_type)
 	case GC_URGENT_HIGH:
 		gc_mode = GC_GREEDY;
 		break;
+	case GC_IDLE_AT:
+		gc_mode = GC_AT;
+		break;
 	}
+
 	return gc_mode;
 }
 
@@ -193,6 +208,11 @@ static void select_policy(struct f2fs_sb_info *sbi, int gc_type,
 		p->dirty_bitmap = dirty_i->dirty_segmap[type];
 		p->max_search = dirty_i->nr_dirty[type];
 		p->ofs_unit = 1;
+	} else if (p->alloc_mode == AT_SSR) {
+		p->gc_mode = GC_GREEDY;
+		p->dirty_bitmap = dirty_i->dirty_segmap[type];
+		p->max_search = dirty_i->nr_dirty[type];
+		p->ofs_unit = 1;
 	} else {
 		p->gc_mode = select_gc_type(sbi, gc_type);
 		p->ofs_unit = sbi->segs_per_sec;
@@ -212,6 +232,7 @@ static void select_policy(struct f2fs_sb_info *sbi, int gc_type,
 	 */
 	if (gc_type != FG_GC &&
 			(sbi->gc_mode != GC_URGENT_HIGH) &&
+			(p->gc_mode != GC_AT && p->alloc_mode != AT_SSR) &&
 			p->max_search > sbi->max_victim_search)
 		p->max_search = sbi->max_victim_search;
 
@@ -229,10 +250,16 @@ static unsigned int get_max_cost(struct f2fs_sb_info *sbi,
 	/* SSR allocates in a segment unit */
 	if (p->alloc_mode == SSR)
 		return sbi->blocks_per_seg;
+	else if (p->alloc_mode == AT_SSR)
+		return UINT_MAX;
+
+	/* LFS */
 	if (p->gc_mode == GC_GREEDY)
 		return 2 * sbi->blocks_per_seg * p->ofs_unit;
 	else if (p->gc_mode == GC_CB)
 		return UINT_MAX;
+	else if (p->gc_mode == GC_AT)
+		return UINT_MAX;
 	else /* No other gc_mode */
 		return 0;
 }
@@ -266,13 +293,14 @@ static unsigned int get_cb_cost(struct f2fs_sb_info *sbi, unsigned int segno)
 	unsigned char age = 0;
 	unsigned char u;
 	unsigned int i;
+	unsigned int usable_segs_per_sec = f2fs_usable_segs_in_sec(sbi, segno);
 
-	for (i = 0; i < sbi->segs_per_sec; i++)
+	for (i = 0; i < usable_segs_per_sec; i++)
 		mtime += get_seg_entry(sbi, start + i)->mtime;
 	vblocks = get_valid_blocks(sbi, segno, true);
 
-	mtime = div_u64(mtime, sbi->segs_per_sec);
-	vblocks = div_u64(vblocks, sbi->segs_per_sec);
+	mtime = div_u64(mtime, usable_segs_per_sec);
+	vblocks = div_u64(vblocks, usable_segs_per_sec);
 
 	u = (vblocks * 100) >> sbi->log_blocks_per_seg;
 
@@ -297,8 +325,11 @@ static inline unsigned int get_gc_cost(struct f2fs_sb_info *sbi,
 	/* alloc_mode == LFS */
 	if (p->gc_mode == GC_GREEDY)
 		return get_valid_blocks(sbi, segno, true);
-	else
+	else if (p->gc_mode == GC_CB)
 		return get_cb_cost(sbi, segno);
+
+	f2fs_bug_on(sbi, 1);
+	return 0;
 }
 
 static unsigned int count_bits(const unsigned long *addr,
@@ -313,6 +344,273 @@ static unsigned int count_bits(const unsigned long *addr,
 	return sum;
 }
 
+static struct victim_entry *attach_victim_entry(struct f2fs_sb_info *sbi,
+				unsigned long long mtime, unsigned int segno,
+				struct rb_node *parent, struct rb_node **p,
+				bool left_most)
+{
+	struct atgc_management *am = &sbi->am;
+	struct victim_entry *ve;
+
+	ve =  f2fs_kmem_cache_alloc(victim_entry_slab, GFP_NOFS);
+
+	ve->mtime = mtime;
+	ve->segno = segno;
+
+	rb_link_node(&ve->rb_node, parent, p);
+	rb_insert_color_cached(&ve->rb_node, &am->root, left_most);
+
+	list_add_tail(&ve->list, &am->victim_list);
+
+	am->victim_count++;
+
+	return ve;
+}
+
+static void insert_victim_entry(struct f2fs_sb_info *sbi,
+				unsigned long long mtime, unsigned int segno)
+{
+	struct atgc_management *am = &sbi->am;
+	struct rb_node **p;
+	struct rb_node *parent = NULL;
+	bool left_most = true;
+
+	p = f2fs_lookup_rb_tree_ext(sbi, &am->root, &parent, mtime, &left_most);
+	attach_victim_entry(sbi, mtime, segno, parent, p, left_most);
+}
+
+static void add_victim_entry(struct f2fs_sb_info *sbi,
+				struct victim_sel_policy *p, unsigned int segno)
+{
+	struct sit_info *sit_i = SIT_I(sbi);
+	unsigned int secno = GET_SEC_FROM_SEG(sbi, segno);
+	unsigned int start = GET_SEG_FROM_SEC(sbi, secno);
+	unsigned long long mtime = 0;
+	unsigned int i;
+
+	if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED))) {
+		if (p->gc_mode == GC_AT &&
+			get_valid_blocks(sbi, segno, true) == 0)
+			return;
+
+		if (p->alloc_mode == AT_SSR &&
+			get_seg_entry(sbi, segno)->ckpt_valid_blocks == 0)
+			return;
+	}
+
+	for (i = 0; i < sbi->segs_per_sec; i++)
+		mtime += get_seg_entry(sbi, start + i)->mtime;
+	mtime = div_u64(mtime, sbi->segs_per_sec);
+
+	/* Handle if the system time has changed by the user */
+	if (mtime < sit_i->min_mtime)
+		sit_i->min_mtime = mtime;
+	if (mtime > sit_i->max_mtime)
+		sit_i->max_mtime = mtime;
+	if (mtime < sit_i->dirty_min_mtime)
+		sit_i->dirty_min_mtime = mtime;
+	if (mtime > sit_i->dirty_max_mtime)
+		sit_i->dirty_max_mtime = mtime;
+
+	/* don't choose young section as candidate */
+	if (sit_i->dirty_max_mtime - mtime < p->age_threshold)
+		return;
+
+	insert_victim_entry(sbi, mtime, segno);
+}
+
+static struct rb_node *lookup_central_victim(struct f2fs_sb_info *sbi,
+						struct victim_sel_policy *p)
+{
+	struct atgc_management *am = &sbi->am;
+	struct rb_node *parent = NULL;
+	bool left_most;
+
+	f2fs_lookup_rb_tree_ext(sbi, &am->root, &parent, p->age, &left_most);
+
+	return parent;
+}
+
+static void atgc_lookup_victim(struct f2fs_sb_info *sbi,
+						struct victim_sel_policy *p)
+{
+	struct sit_info *sit_i = SIT_I(sbi);
+	struct atgc_management *am = &sbi->am;
+	struct rb_root_cached *root = &am->root;
+	struct rb_node *node;
+	struct rb_entry *re;
+	struct victim_entry *ve;
+	unsigned long long total_time;
+	unsigned long long age, u, accu;
+	unsigned long long max_mtime = sit_i->dirty_max_mtime;
+	unsigned long long min_mtime = sit_i->dirty_min_mtime;
+	unsigned int sec_blocks = BLKS_PER_SEC(sbi);
+	unsigned int vblocks;
+	unsigned int dirty_threshold = max(am->max_candidate_count,
+					am->candidate_ratio *
+					am->victim_count / 100);
+	unsigned int age_weight = am->age_weight;
+	unsigned int cost;
+	unsigned int iter = 0;
+
+	if (max_mtime < min_mtime)
+		return;
+
+	max_mtime += 1;
+	total_time = max_mtime - min_mtime;
+
+	accu = div64_u64(ULLONG_MAX, total_time);
+	accu = min_t(unsigned long long, div_u64(accu, 100),
+					DEFAULT_ACCURACY_CLASS);
+
+	node = rb_first_cached(root);
+next:
+	re = rb_entry_safe(node, struct rb_entry, rb_node);
+	if (!re)
+		return;
+
+	ve = (struct victim_entry *)re;
+
+	if (ve->mtime >= max_mtime || ve->mtime < min_mtime)
+		goto skip;
+
+	/* age = 10000 * x% * 60 */
+	age = div64_u64(accu * (max_mtime - ve->mtime), total_time) *
+								age_weight;
+
+	vblocks = get_valid_blocks(sbi, ve->segno, true);
+	f2fs_bug_on(sbi, !vblocks || vblocks == sec_blocks);
+
+	/* u = 10000 * x% * 40 */
+	u = div64_u64(accu * (sec_blocks - vblocks), sec_blocks) *
+							(100 - age_weight);
+
+	f2fs_bug_on(sbi, age + u >= UINT_MAX);
+
+	cost = UINT_MAX - (age + u);
+	iter++;
+
+	if (cost < p->min_cost ||
+			(cost == p->min_cost && age > p->oldest_age)) {
+		p->min_cost = cost;
+		p->oldest_age = age;
+		p->min_segno = ve->segno;
+	}
+skip:
+	if (iter < dirty_threshold) {
+		node = rb_next(node);
+		goto next;
+	}
+}
+
+/*
+ * select candidates around source section in range of
+ * [target - dirty_threshold, target + dirty_threshold]
+ */
+static void atssr_lookup_victim(struct f2fs_sb_info *sbi,
+						struct victim_sel_policy *p)
+{
+	struct sit_info *sit_i = SIT_I(sbi);
+	struct atgc_management *am = &sbi->am;
+	struct rb_node *node;
+	struct rb_entry *re;
+	struct victim_entry *ve;
+	unsigned long long age;
+	unsigned long long max_mtime = sit_i->dirty_max_mtime;
+	unsigned long long min_mtime = sit_i->dirty_min_mtime;
+	unsigned int seg_blocks = sbi->blocks_per_seg;
+	unsigned int vblocks;
+	unsigned int dirty_threshold = max(am->max_candidate_count,
+					am->candidate_ratio *
+					am->victim_count / 100);
+	unsigned int cost;
+	unsigned int iter = 0;
+	int stage = 0;
+
+	if (max_mtime < min_mtime)
+		return;
+	max_mtime += 1;
+next_stage:
+	node = lookup_central_victim(sbi, p);
+next_node:
+	re = rb_entry_safe(node, struct rb_entry, rb_node);
+	if (!re) {
+		if (stage == 0)
+			goto skip_stage;
+		return;
+	}
+
+	ve = (struct victim_entry *)re;
+
+	if (ve->mtime >= max_mtime || ve->mtime < min_mtime)
+		goto skip_node;
+
+	age = max_mtime - ve->mtime;
+
+	vblocks = get_seg_entry(sbi, ve->segno)->ckpt_valid_blocks;
+	f2fs_bug_on(sbi, !vblocks);
+
+	/* rare case */
+	if (vblocks == seg_blocks)
+		goto skip_node;
+
+	iter++;
+
+	age = max_mtime - abs(p->age - age);
+	cost = UINT_MAX - vblocks;
+
+	if (cost < p->min_cost ||
+			(cost == p->min_cost && age > p->oldest_age)) {
+		p->min_cost = cost;
+		p->oldest_age = age;
+		p->min_segno = ve->segno;
+	}
+skip_node:
+	if (iter < dirty_threshold) {
+		if (stage == 0)
+			node = rb_prev(node);
+		else if (stage == 1)
+			node = rb_next(node);
+		goto next_node;
+	}
+skip_stage:
+	if (stage < 1) {
+		stage++;
+		iter = 0;
+		goto next_stage;
+	}
+}
+static void lookup_victim_by_age(struct f2fs_sb_info *sbi,
+						struct victim_sel_policy *p)
+{
+	f2fs_bug_on(sbi, !f2fs_check_rb_tree_consistence(sbi,
+						&sbi->am.root, true));
+
+	if (p->gc_mode == GC_AT)
+		atgc_lookup_victim(sbi, p);
+	else if (p->alloc_mode == AT_SSR)
+		atssr_lookup_victim(sbi, p);
+	else
+		f2fs_bug_on(sbi, 1);
+}
+
+static void release_victim_entry(struct f2fs_sb_info *sbi)
+{
+	struct atgc_management *am = &sbi->am;
+	struct victim_entry *ve, *tmp;
+
+	list_for_each_entry_safe(ve, tmp, &am->victim_list, list) {
+		list_del(&ve->list);
+		kmem_cache_free(victim_entry_slab, ve);
+		am->victim_count--;
+	}
+
+	am->root = RB_ROOT_CACHED;
+
+	f2fs_bug_on(sbi, am->victim_count);
+	f2fs_bug_on(sbi, !list_empty(&am->victim_list));
+}
+
 /*
  * This function is called from two paths.
  * One is garbage collection and the other is SSR segment selection.
@@ -322,25 +620,37 @@ static unsigned int count_bits(const unsigned long *addr,
  * which has minimum valid blocks and removes it from dirty seglist.
  */
 static int get_victim_by_default(struct f2fs_sb_info *sbi,
-		unsigned int *result, int gc_type, int type, char alloc_mode)
+			unsigned int *result, int gc_type, int type,
+			char alloc_mode, unsigned long long age)
 {
 	struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
 	struct sit_info *sm = SIT_I(sbi);
 	struct victim_sel_policy p;
 	unsigned int secno, last_victim;
 	unsigned int last_segment;
-	unsigned int nsearched = 0;
+	unsigned int nsearched;
+	bool is_atgc;
 	int ret = 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);
+	p.age = age;
+	p.age_threshold = sbi->am.age_threshold;
 
+retry:
+	select_policy(sbi, gc_type, type, &p);
 	p.min_segno = NULL_SEGNO;
+	p.oldest_age = 0;
 	p.min_cost = get_max_cost(sbi, &p);
 
+	is_atgc = (p.gc_mode == GC_AT || p.alloc_mode == AT_SSR);
+	nsearched = 0;
+
+	if (is_atgc)
+		SIT_I(sbi)->dirty_min_mtime = ULLONG_MAX;
+
 	if (*result != NULL_SEGNO) {
 		if (!get_valid_blocks(sbi, *result, false)) {
 			ret = -ENODATA;
@@ -421,11 +731,16 @@ static int get_victim_by_default(struct f2fs_sb_info *sbi,
 		/* 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))
+					p.alloc_mode == LFS))
 			goto next;
 		if (gc_type == BG_GC && test_bit(secno, dirty_i->victim_secmap))
 			goto next;
 
+		if (is_atgc) {
+			add_victim_entry(sbi, &p, segno);
+			goto next;
+		}
+
 		cost = get_gc_cost(sbi, segno, &p);
 
 		if (p.min_cost > cost) {
@@ -444,6 +759,19 @@ next:
 			break;
 		}
 	}
+
+	/* get victim for GC_AT/AT_SSR */
+	if (is_atgc) {
+		lookup_victim_by_age(sbi, &p);
+		release_victim_entry(sbi);
+	}
+
+	if (is_atgc && p.min_segno == NULL_SEGNO &&
+			sm->elapsed_time < p.age_threshold) {
+		p.age_threshold = 0;
+		goto retry;
+	}
+
 	if (p.min_segno != NULL_SEGNO) {
 got_it:
 		*result = (p.min_segno / p.ofs_unit) * p.ofs_unit;
@@ -536,6 +864,7 @@ static int gc_node_segment(struct f2fs_sb_info *sbi,
 	int phase = 0;
 	bool fggc = (gc_type == FG_GC);
 	int submitted = 0;
+	unsigned int usable_blks_in_seg = f2fs_usable_blks_in_seg(sbi, segno);
 
 	start_addr = START_BLOCK(sbi, segno);
 
@@ -545,7 +874,7 @@ next_step:
 	if (fggc && phase == 2)
 		atomic_inc(&sbi->wb_sync_req[NODE]);
 
-	for (off = 0; off < sbi->blocks_per_seg; off++, entry++) {
+	for (off = 0; off < usable_blks_in_seg; off++, entry++) {
 		nid_t nid = le32_to_cpu(entry->nid);
 		struct page *node_page;
 		struct node_info ni;
@@ -791,6 +1120,8 @@ static int move_data_block(struct inode *inode, block_t bidx,
 	block_t newaddr;
 	int err = 0;
 	bool lfs_mode = f2fs_lfs_mode(fio.sbi);
+	int type = fio.sbi->am.atgc_enabled ?
+				CURSEG_ALL_DATA_ATGC : CURSEG_COLD_DATA;
 
 	/* do not read out */
 	page = f2fs_grab_cache_page(inode->i_mapping, bidx, false);
@@ -877,7 +1208,7 @@ static int move_data_block(struct inode *inode, block_t bidx,
 	}
 
 	f2fs_allocate_data_block(fio.sbi, NULL, fio.old_blkaddr, &newaddr,
-					&sum, CURSEG_COLD_DATA, NULL);
+				&sum, type, NULL);
 
 	fio.encrypted_page = f2fs_pagecache_get_page(META_MAPPING(fio.sbi),
 				newaddr, FGP_LOCK | FGP_CREAT, GFP_NOFS);
@@ -927,7 +1258,7 @@ put_page_out:
 recover_block:
 	if (err)
 		f2fs_do_replace_block(fio.sbi, &sum, newaddr, fio.old_blkaddr,
-								true, true);
+							true, true, true);
 up_out:
 	if (lfs_mode)
 		up_write(&fio.sbi->io_order_lock);
@@ -1033,13 +1364,14 @@ static int gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
 	int off;
 	int phase = 0;
 	int submitted = 0;
+	unsigned int usable_blks_in_seg = f2fs_usable_blks_in_seg(sbi, segno);
 
 	start_addr = START_BLOCK(sbi, segno);
 
 next_step:
 	entry = sum;
 
-	for (off = 0; off < sbi->blocks_per_seg; off++, entry++) {
+	for (off = 0; off < usable_blks_in_seg; off++, entry++) {
 		struct page *data_page;
 		struct inode *inode;
 		struct node_info dni; /* dnode info for the data */
@@ -1182,7 +1514,7 @@ static int __get_victim(struct f2fs_sb_info *sbi, unsigned int *victim,
 
 	down_write(&sit_i->sentry_lock);
 	ret = DIRTY_I(sbi)->v_ops->get_victim(sbi, victim, gc_type,
-					      NO_CHECK_TYPE, LFS);
+					      NO_CHECK_TYPE, LFS, 0);
 	up_write(&sit_i->sentry_lock);
 	return ret;
 }
@@ -1204,6 +1536,17 @@ static int do_garbage_collect(struct f2fs_sb_info *sbi,
 	if (__is_large_section(sbi))
 		end_segno = rounddown(end_segno, sbi->segs_per_sec);
 
+	/*
+	 * zone-capacity can be less than zone-size in zoned devices,
+	 * resulting in less than expected usable segments in the zone,
+	 * calculate the end segno in the zone which can be garbage collected
+	 */
+	if (f2fs_sb_has_blkzoned(sbi))
+		end_segno -= sbi->segs_per_sec -
+					f2fs_usable_segs_in_sec(sbi, segno);
+
+	sanity_check_seg_type(sbi, get_seg_entry(sbi, segno)->type);
+
 	/* readahead multi ssa blocks those have contiguous address */
 	if (__is_large_section(sbi))
 		f2fs_ra_meta_pages(sbi, GET_SUM_BLOCK(sbi, segno),
@@ -1356,7 +1699,8 @@ gc_more:
 		goto stop;
 
 	seg_freed = do_garbage_collect(sbi, segno, &gc_list, gc_type);
-	if (gc_type == FG_GC && seg_freed == sbi->segs_per_sec)
+	if (gc_type == FG_GC &&
+		seg_freed == f2fs_usable_segs_in_sec(sbi, segno))
 		sec_freed++;
 	total_freed += seg_freed;
 
@@ -1413,6 +1757,37 @@ stop:
 	return ret;
 }
 
+int __init f2fs_create_garbage_collection_cache(void)
+{
+	victim_entry_slab = f2fs_kmem_cache_create("f2fs_victim_entry",
+					sizeof(struct victim_entry));
+	if (!victim_entry_slab)
+		return -ENOMEM;
+	return 0;
+}
+
+void f2fs_destroy_garbage_collection_cache(void)
+{
+	kmem_cache_destroy(victim_entry_slab);
+}
+
+static void init_atgc_management(struct f2fs_sb_info *sbi)
+{
+	struct atgc_management *am = &sbi->am;
+
+	if (test_opt(sbi, ATGC) &&
+		SIT_I(sbi)->elapsed_time >= DEF_GC_THREAD_AGE_THRESHOLD)
+		am->atgc_enabled = true;
+
+	am->root = RB_ROOT_CACHED;
+	INIT_LIST_HEAD(&am->victim_list);
+	am->victim_count = 0;
+
+	am->candidate_ratio = DEF_GC_THREAD_CANDIDATE_RATIO;
+	am->max_candidate_count = DEF_GC_THREAD_MAX_CANDIDATE_COUNT;
+	am->age_weight = DEF_GC_THREAD_AGE_WEIGHT;
+}
+
 void f2fs_build_gc_manager(struct f2fs_sb_info *sbi)
 {
 	DIRTY_I(sbi)->v_ops = &default_v_ops;
@@ -1423,6 +1798,8 @@ void f2fs_build_gc_manager(struct f2fs_sb_info *sbi)
 	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;
+
+	init_atgc_management(sbi);
 }
 
 static int free_segment_range(struct f2fs_sb_info *sbi,
@@ -1450,7 +1827,7 @@ static int free_segment_range(struct f2fs_sb_info *sbi,
 	mutex_unlock(&DIRTY_I(sbi)->seglist_lock);
 
 	/* Move out cursegs from the target range */
-	for (type = CURSEG_HOT_DATA; type < NR_CURSEG_TYPE; type++)
+	for (type = CURSEG_HOT_DATA; type < NR_CURSEG_PERSIST_TYPE; type++)
 		f2fs_allocate_segment_for_resize(sbi, type, start, end);
 
 	/* do GC to move out valid blocks in the range */
diff --git a/fs/f2fs/gc.h b/fs/f2fs/gc.h
index db3c61046aa4..0c8dae12dc51 100644
--- a/fs/f2fs/gc.h
+++ b/fs/f2fs/gc.h
@@ -14,6 +14,14 @@
 #define DEF_GC_THREAD_MIN_SLEEP_TIME	30000	/* milliseconds */
 #define DEF_GC_THREAD_MAX_SLEEP_TIME	60000
 #define DEF_GC_THREAD_NOGC_SLEEP_TIME	300000	/* wait 5 min */
+
+/* choose candidates from sections which has age of more than 7 days */
+#define DEF_GC_THREAD_AGE_THRESHOLD		(60 * 60 * 24 * 7)
+#define DEF_GC_THREAD_CANDIDATE_RATIO		20	/* select 20% oldest sections as candidates */
+#define DEF_GC_THREAD_MAX_CANDIDATE_COUNT	10	/* select at most 10 sections as candidates */
+#define DEF_GC_THREAD_AGE_WEIGHT		60	/* age weight */
+#define DEFAULT_ACCURACY_CLASS			10000	/* accuracy class */
+
 #define LIMIT_INVALID_BLOCK	40 /* percentage over total user space */
 #define LIMIT_FREE_BLOCK	40 /* percentage over invalid + free space */
 
@@ -41,16 +49,69 @@ struct gc_inode_list {
 	struct radix_tree_root iroot;
 };
 
+struct victim_info {
+	unsigned long long mtime;	/* mtime of section */
+	unsigned int segno;		/* section No. */
+};
+
+struct victim_entry {
+	struct rb_node rb_node;		/* rb node located in rb-tree */
+	union {
+		struct {
+			unsigned long long mtime;	/* mtime of section */
+			unsigned int segno;		/* segment No. */
+		};
+		struct victim_info vi;	/* victim info */
+	};
+	struct list_head list;
+};
+
 /*
  * inline functions
  */
+
+/*
+ * On a Zoned device zone-capacity can be less than zone-size and if
+ * zone-capacity is not aligned to f2fs segment size(2MB), then the segment
+ * starting just before zone-capacity has some blocks spanning across the
+ * zone-capacity, these blocks are not usable.
+ * Such spanning segments can be in free list so calculate the sum of usable
+ * blocks in currently free segments including normal and spanning segments.
+ */
+static inline block_t free_segs_blk_count_zoned(struct f2fs_sb_info *sbi)
+{
+	block_t free_seg_blks = 0;
+	struct free_segmap_info *free_i = FREE_I(sbi);
+	int j;
+
+	spin_lock(&free_i->segmap_lock);
+	for (j = 0; j < MAIN_SEGS(sbi); j++)
+		if (!test_bit(j, free_i->free_segmap))
+			free_seg_blks += f2fs_usable_blks_in_seg(sbi, j);
+	spin_unlock(&free_i->segmap_lock);
+
+	return free_seg_blks;
+}
+
+static inline block_t free_segs_blk_count(struct f2fs_sb_info *sbi)
+{
+	if (f2fs_sb_has_blkzoned(sbi))
+		return free_segs_blk_count_zoned(sbi);
+
+	return free_segments(sbi) << sbi->log_blocks_per_seg;
+}
+
 static inline block_t free_user_blocks(struct f2fs_sb_info *sbi)
 {
-	if (free_segments(sbi) < overprovision_segments(sbi))
+	block_t free_blks, ovp_blks;
+
+	free_blks = free_segs_blk_count(sbi);
+	ovp_blks = overprovision_segments(sbi) << sbi->log_blocks_per_seg;
+
+	if (free_blks < ovp_blks)
 		return 0;
-	else
-		return (free_segments(sbi) - overprovision_segments(sbi))
-			<< sbi->log_blocks_per_seg;
+
+	return free_blks - ovp_blks;
 }
 
 static inline block_t limit_invalid_user_blocks(struct f2fs_sb_info *sbi)
diff --git a/fs/f2fs/inline.c b/fs/f2fs/inline.c
index 102df444f623..70384e31788d 100644
--- a/fs/f2fs/inline.c
+++ b/fs/f2fs/inline.c
@@ -524,7 +524,7 @@ static int f2fs_move_rehashed_dirents(struct inode *dir, struct page *ipage,
 			!f2fs_has_inline_xattr(dir))
 		F2FS_I(dir)->i_inline_xattr_size = 0;
 
-	kvfree(backup_dentry);
+	kfree(backup_dentry);
 	return 0;
 recover:
 	lock_page(ipage);
@@ -535,7 +535,7 @@ recover:
 	set_page_dirty(ipage);
 	f2fs_put_page(ipage, 1);
 
-	kvfree(backup_dentry);
+	kfree(backup_dentry);
 	return err;
 }
 
diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
index 66969ae852b9..657db2fb6739 100644
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -287,11 +287,19 @@ static bool sanity_check_inode(struct inode *inode, struct page *node_page)
 		return false;
 	}
 
+	if ((fi->i_flags & F2FS_CASEFOLD_FL) && !f2fs_sb_has_casefold(sbi)) {
+		set_sbi_flag(sbi, SBI_NEED_FSCK);
+		f2fs_warn(sbi, "%s: inode (ino=%lx) has casefold flag, but casefold feature is off",
+			  __func__, inode->i_ino);
+		return false;
+	}
+
 	if (f2fs_has_extra_attr(inode) && f2fs_sb_has_compression(sbi) &&
 			fi->i_flags & F2FS_COMPR_FL &&
 			F2FS_FITS_IN_INODE(ri, fi->i_extra_isize,
 						i_log_cluster_size)) {
 		if (ri->i_compress_algorithm >= COMPRESS_MAX) {
+			set_sbi_flag(sbi, SBI_NEED_FSCK);
 			f2fs_warn(sbi, "%s: inode (ino=%lx) has unsupported "
 				"compress algorithm: %u, run fsck to fix",
 				  __func__, inode->i_ino,
@@ -300,6 +308,7 @@ static bool sanity_check_inode(struct inode *inode, struct page *node_page)
 		}
 		if (le64_to_cpu(ri->i_compr_blocks) >
 				SECTOR_TO_BLOCK(inode->i_blocks)) {
+			set_sbi_flag(sbi, SBI_NEED_FSCK);
 			f2fs_warn(sbi, "%s: inode (ino=%lx) has inconsistent "
 				"i_compr_blocks:%llu, i_blocks:%llu, run fsck to fix",
 				  __func__, inode->i_ino,
@@ -309,6 +318,7 @@ static bool sanity_check_inode(struct inode *inode, struct page *node_page)
 		}
 		if (ri->i_log_cluster_size < MIN_COMPRESS_LOG_SIZE ||
 			ri->i_log_cluster_size > MAX_COMPRESS_LOG_SIZE) {
+			set_sbi_flag(sbi, SBI_NEED_FSCK);
 			f2fs_warn(sbi, "%s: inode (ino=%lx) has unsupported "
 				"log cluster size: %u, run fsck to fix",
 				  __func__, inode->i_ino,
@@ -442,7 +452,8 @@ static int do_read_inode(struct inode *inode)
 					(fi->i_flags & F2FS_COMPR_FL)) {
 		if (F2FS_FITS_IN_INODE(ri, fi->i_extra_isize,
 					i_log_cluster_size)) {
-			fi->i_compr_blocks = le64_to_cpu(ri->i_compr_blocks);
+			atomic_set(&fi->i_compr_blocks,
+					le64_to_cpu(ri->i_compr_blocks));
 			fi->i_compress_algorithm = ri->i_compress_algorithm;
 			fi->i_log_cluster_size = ri->i_log_cluster_size;
 			fi->i_cluster_size = 1 << fi->i_log_cluster_size;
@@ -460,7 +471,7 @@ static int do_read_inode(struct inode *inode)
 	stat_inc_inline_inode(inode);
 	stat_inc_inline_dir(inode);
 	stat_inc_compr_inode(inode);
-	stat_add_compr_blocks(inode, F2FS_I(inode)->i_compr_blocks);
+	stat_add_compr_blocks(inode, atomic_read(&fi->i_compr_blocks));
 
 	return 0;
 }
@@ -619,7 +630,8 @@ void f2fs_update_inode(struct inode *inode, struct page *node_page)
 			F2FS_FITS_IN_INODE(ri, F2FS_I(inode)->i_extra_isize,
 							i_log_cluster_size)) {
 			ri->i_compr_blocks =
-				cpu_to_le64(F2FS_I(inode)->i_compr_blocks);
+				cpu_to_le64(atomic_read(
+					&F2FS_I(inode)->i_compr_blocks));
 			ri->i_compress_algorithm =
 				F2FS_I(inode)->i_compress_algorithm;
 			ri->i_log_cluster_size =
@@ -768,7 +780,8 @@ no_delete:
 	stat_dec_inline_dir(inode);
 	stat_dec_inline_inode(inode);
 	stat_dec_compr_inode(inode);
-	stat_sub_compr_blocks(inode, F2FS_I(inode)->i_compr_blocks);
+	stat_sub_compr_blocks(inode,
+			atomic_read(&F2FS_I(inode)->i_compr_blocks));
 
 	if (likely(!f2fs_cp_error(sbi) &&
 				!is_sbi_flag_set(sbi, SBI_CP_DISABLED)))
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index 45f324511a19..8fa37d1434de 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -712,7 +712,7 @@ out_f2fs_handle_failed_inode:
 	f2fs_handle_failed_inode(inode);
 out_free_encrypted_link:
 	if (disk_link.name != (unsigned char *)symname)
-		kvfree(disk_link.name);
+		kfree(disk_link.name);
 	return err;
 }
 
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index cb1b5b61a1da..d5d8ce077f29 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -109,7 +109,7 @@ static void clear_node_page_dirty(struct page *page)
 
 static struct page *get_current_nat_page(struct f2fs_sb_info *sbi, nid_t nid)
 {
-	return f2fs_get_meta_page_nofail(sbi, current_nat_addr(sbi, nid));
+	return f2fs_get_meta_page(sbi, current_nat_addr(sbi, nid));
 }
 
 static struct page *get_next_nat_page(struct f2fs_sb_info *sbi, nid_t nid)
@@ -3105,9 +3105,6 @@ static int init_node_manager(struct f2fs_sb_info *sbi)
 	nm_i->next_scan_nid = le32_to_cpu(sbi->ckpt->next_free_nid);
 	nm_i->bitmap_size = __bitmap_size(sbi, NAT_BITMAP);
 	version_bitmap = __bitmap_ptr(sbi, NAT_BITMAP);
-	if (!version_bitmap)
-		return -EFAULT;
-
 	nm_i->nat_bitmap = kmemdup(version_bitmap, nm_i->bitmap_size,
 					GFP_KERNEL);
 	if (!nm_i->nat_bitmap)
@@ -3257,7 +3254,7 @@ void f2fs_destroy_node_manager(struct f2fs_sb_info *sbi)
 	kvfree(nm_i->nat_bitmap_mir);
 #endif
 	sbi->nm_info = NULL;
-	kvfree(nm_i);
+	kfree(nm_i);
 }
 
 int __init f2fs_create_node_manager_caches(void)
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index e247a5ef3713..1596502f7375 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -189,7 +189,7 @@ void f2fs_register_inmem_page(struct inode *inode, struct page *page)
 
 	f2fs_trace_pid(page);
 
-	f2fs_set_page_private(page, (unsigned long)ATOMIC_WRITTEN_PAGE);
+	f2fs_set_page_private(page, ATOMIC_WRITTEN_PAGE);
 
 	new = f2fs_kmem_cache_alloc(inmem_entry_slab, GFP_NOFS);
 
@@ -728,7 +728,7 @@ init_thread:
 				"f2fs_flush-%u:%u", MAJOR(dev), MINOR(dev));
 	if (IS_ERR(fcc->f2fs_issue_flush)) {
 		err = PTR_ERR(fcc->f2fs_issue_flush);
-		kvfree(fcc);
+		kfree(fcc);
 		SM_I(sbi)->fcc_info = NULL;
 		return err;
 	}
@@ -747,7 +747,7 @@ void f2fs_destroy_flush_cmd_control(struct f2fs_sb_info *sbi, bool free)
 		kthread_stop(flush_thread);
 	}
 	if (free) {
-		kvfree(fcc);
+		kfree(fcc);
 		SM_I(sbi)->fcc_info = NULL;
 	}
 }
@@ -759,6 +759,9 @@ int f2fs_flush_device_cache(struct f2fs_sb_info *sbi)
 	if (!f2fs_is_multi_device(sbi))
 		return 0;
 
+	if (test_opt(sbi, NOBARRIER))
+		return 0;
+
 	for (i = 1; i < sbi->s_ndevs; i++) {
 		if (!f2fs_test_bit(i, (char *)&sbi->dirty_device))
 			continue;
@@ -859,20 +862,22 @@ static void locate_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno)
 {
 	struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
 	unsigned short valid_blocks, ckpt_valid_blocks;
+	unsigned int usable_blocks;
 
 	if (segno == NULL_SEGNO || IS_CURSEG(sbi, segno))
 		return;
 
+	usable_blocks = f2fs_usable_blks_in_seg(sbi, segno);
 	mutex_lock(&dirty_i->seglist_lock);
 
 	valid_blocks = get_valid_blocks(sbi, segno, false);
 	ckpt_valid_blocks = get_ckpt_valid_blocks(sbi, segno);
 
 	if (valid_blocks == 0 && (!is_sbi_flag_set(sbi, SBI_CP_DISABLED) ||
-				ckpt_valid_blocks == sbi->blocks_per_seg)) {
+		ckpt_valid_blocks == usable_blocks)) {
 		__locate_dirty_segment(sbi, segno, PRE);
 		__remove_dirty_segment(sbi, segno, DIRTY);
-	} else if (valid_blocks < sbi->blocks_per_seg) {
+	} else if (valid_blocks < usable_blocks) {
 		__locate_dirty_segment(sbi, segno, DIRTY);
 	} else {
 		/* Recovery routine with SSR needs this */
@@ -915,9 +920,11 @@ block_t f2fs_get_unusable_blocks(struct f2fs_sb_info *sbi)
 	for_each_set_bit(segno, dirty_i->dirty_segmap[DIRTY], MAIN_SEGS(sbi)) {
 		se = get_seg_entry(sbi, segno);
 		if (IS_NODESEG(se->type))
-			holes[NODE] += sbi->blocks_per_seg - se->valid_blocks;
+			holes[NODE] += f2fs_usable_blks_in_seg(sbi, segno) -
+							se->valid_blocks;
 		else
-			holes[DATA] += sbi->blocks_per_seg - se->valid_blocks;
+			holes[DATA] += f2fs_usable_blks_in_seg(sbi, segno) -
+							se->valid_blocks;
 	}
 	mutex_unlock(&dirty_i->seglist_lock);
 
@@ -1521,7 +1528,7 @@ retry:
 			goto next;
 		if (unlikely(dcc->rbtree_check))
 			f2fs_bug_on(sbi, !f2fs_check_rb_tree_consistence(sbi,
-								&dcc->root));
+							&dcc->root, false));
 		blk_start_plug(&plug);
 		list_for_each_entry_safe(dc, tmp, pend_list, list) {
 			f2fs_bug_on(sbi, dc->state != D_PREP);
@@ -1958,7 +1965,7 @@ static void set_prefree_as_free_segments(struct f2fs_sb_info *sbi)
 
 	mutex_lock(&dirty_i->seglist_lock);
 	for_each_set_bit(segno, dirty_i->dirty_segmap[PRE], MAIN_SEGS(sbi))
-		__set_test_and_free(sbi, segno);
+		__set_test_and_free(sbi, segno, false);
 	mutex_unlock(&dirty_i->seglist_lock);
 }
 
@@ -2101,7 +2108,7 @@ init_thread:
 				"f2fs_discard-%u:%u", MAJOR(dev), MINOR(dev));
 	if (IS_ERR(dcc->f2fs_issue_discard)) {
 		err = PTR_ERR(dcc->f2fs_issue_discard);
-		kvfree(dcc);
+		kfree(dcc);
 		SM_I(sbi)->dcc_info = NULL;
 		return err;
 	}
@@ -2125,7 +2132,7 @@ static void destroy_discard_cmd_control(struct f2fs_sb_info *sbi)
 	if (unlikely(atomic_read(&dcc->discard_cmd_cnt)))
 		f2fs_issue_discard_timeout(sbi);
 
-	kvfree(dcc);
+	kfree(dcc);
 	SM_I(sbi)->dcc_info = NULL;
 }
 
@@ -2150,6 +2157,39 @@ static void __set_sit_entry_type(struct f2fs_sb_info *sbi, int type,
 		__mark_sit_entry_dirty(sbi, segno);
 }
 
+static inline unsigned long long get_segment_mtime(struct f2fs_sb_info *sbi,
+								block_t blkaddr)
+{
+	unsigned int segno = GET_SEGNO(sbi, blkaddr);
+
+	if (segno == NULL_SEGNO)
+		return 0;
+	return get_seg_entry(sbi, segno)->mtime;
+}
+
+static void update_segment_mtime(struct f2fs_sb_info *sbi, block_t blkaddr,
+						unsigned long long old_mtime)
+{
+	struct seg_entry *se;
+	unsigned int segno = GET_SEGNO(sbi, blkaddr);
+	unsigned long long ctime = get_mtime(sbi, false);
+	unsigned long long mtime = old_mtime ? old_mtime : ctime;
+
+	if (segno == NULL_SEGNO)
+		return;
+
+	se = get_seg_entry(sbi, segno);
+
+	if (!se->mtime)
+		se->mtime = mtime;
+	else
+		se->mtime = div_u64(se->mtime * se->valid_blocks + mtime,
+						se->valid_blocks + 1);
+
+	if (ctime > SIT_I(sbi)->max_mtime)
+		SIT_I(sbi)->max_mtime = ctime;
+}
+
 static void update_sit_entry(struct f2fs_sb_info *sbi, block_t blkaddr, int del)
 {
 	struct seg_entry *se;
@@ -2167,12 +2207,9 @@ static void update_sit_entry(struct f2fs_sb_info *sbi, block_t blkaddr, int del)
 	offset = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
 
 	f2fs_bug_on(sbi, (new_vblocks < 0 ||
-				(new_vblocks > sbi->blocks_per_seg)));
+			(new_vblocks > f2fs_usable_blks_in_seg(sbi, segno))));
 
 	se->valid_blocks = new_vblocks;
-	se->mtime = get_mtime(sbi, false);
-	if (se->mtime > SIT_I(sbi)->max_mtime)
-		SIT_I(sbi)->max_mtime = se->mtime;
 
 	/* Update valid block bitmap */
 	if (del > 0) {
@@ -2265,6 +2302,7 @@ void f2fs_invalidate_blocks(struct f2fs_sb_info *sbi, block_t addr)
 	/* add it into sit main buffer */
 	down_write(&sit_i->sentry_lock);
 
+	update_segment_mtime(sbi, addr, 0);
 	update_sit_entry(sbi, addr, -1);
 
 	/* add it into dirty seglist */
@@ -2344,7 +2382,9 @@ int f2fs_npages_for_summary_flush(struct f2fs_sb_info *sbi, bool for_ra)
  */
 struct page *f2fs_get_sum_page(struct f2fs_sb_info *sbi, unsigned int segno)
 {
-	return f2fs_get_meta_page_nofail(sbi, GET_SUM_BLOCK(sbi, segno));
+	if (unlikely(f2fs_cp_error(sbi)))
+		return ERR_PTR(-EIO);
+	return f2fs_get_meta_page_retry(sbi, GET_SUM_BLOCK(sbi, segno));
 }
 
 void f2fs_update_meta_page(struct f2fs_sb_info *sbi,
@@ -2389,9 +2429,9 @@ static void write_current_sum_page(struct f2fs_sb_info *sbi,
 	f2fs_put_page(page, 1);
 }
 
-static int is_next_segment_free(struct f2fs_sb_info *sbi, int type)
+static int is_next_segment_free(struct f2fs_sb_info *sbi,
+				struct curseg_info *curseg, int type)
 {
-	struct curseg_info *curseg = CURSEG_I(sbi, type);
 	unsigned int segno = curseg->segno + 1;
 	struct free_segmap_info *free_i = FREE_I(sbi);
 
@@ -2495,7 +2535,9 @@ static void reset_curseg(struct f2fs_sb_info *sbi, int type, int modified)
 {
 	struct curseg_info *curseg = CURSEG_I(sbi, type);
 	struct summary_footer *sum_footer;
+	unsigned short seg_type = curseg->seg_type;
 
+	curseg->inited = true;
 	curseg->segno = curseg->next_segno;
 	curseg->zone = GET_ZONE_FROM_SEG(sbi, curseg->segno);
 	curseg->next_blkoff = 0;
@@ -2503,24 +2545,36 @@ static void reset_curseg(struct f2fs_sb_info *sbi, int type, int modified)
 
 	sum_footer = &(curseg->sum_blk->footer);
 	memset(sum_footer, 0, sizeof(struct summary_footer));
-	if (IS_DATASEG(type))
+
+	sanity_check_seg_type(sbi, seg_type);
+
+	if (IS_DATASEG(seg_type))
 		SET_SUM_TYPE(sum_footer, SUM_TYPE_DATA);
-	if (IS_NODESEG(type))
+	if (IS_NODESEG(seg_type))
 		SET_SUM_TYPE(sum_footer, SUM_TYPE_NODE);
-	__set_sit_entry_type(sbi, type, curseg->segno, modified);
+	__set_sit_entry_type(sbi, seg_type, curseg->segno, modified);
 }
 
 static unsigned int __get_next_segno(struct f2fs_sb_info *sbi, int type)
 {
+	struct curseg_info *curseg = CURSEG_I(sbi, type);
+	unsigned short seg_type = curseg->seg_type;
+
+	sanity_check_seg_type(sbi, seg_type);
+
 	/* if segs_per_sec is large than 1, we need to keep original policy. */
 	if (__is_large_section(sbi))
-		return CURSEG_I(sbi, type)->segno;
+		return curseg->segno;
+
+	/* inmem log may not locate on any segment after mount */
+	if (!curseg->inited)
+		return 0;
 
 	if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED)))
 		return 0;
 
 	if (test_opt(sbi, NOHEAP) &&
-		(type == CURSEG_HOT_DATA || IS_NODESEG(type)))
+		(seg_type == CURSEG_HOT_DATA || IS_NODESEG(seg_type)))
 		return 0;
 
 	if (SIT_I(sbi)->last_victim[ALLOC_NEXT])
@@ -2530,7 +2584,7 @@ static unsigned int __get_next_segno(struct f2fs_sb_info *sbi, int type)
 	if (F2FS_OPTION(sbi).alloc_mode == ALLOC_MODE_REUSE)
 		return 0;
 
-	return CURSEG_I(sbi, type)->segno;
+	return curseg->segno;
 }
 
 /*
@@ -2540,12 +2594,14 @@ static unsigned int __get_next_segno(struct f2fs_sb_info *sbi, int type)
 static void new_curseg(struct f2fs_sb_info *sbi, int type, bool new_sec)
 {
 	struct curseg_info *curseg = CURSEG_I(sbi, type);
+	unsigned short seg_type = curseg->seg_type;
 	unsigned int segno = curseg->segno;
 	int dir = ALLOC_LEFT;
 
-	write_sum_page(sbi, curseg->sum_blk,
+	if (curseg->inited)
+		write_sum_page(sbi, curseg->sum_blk,
 				GET_SUM_BLOCK(sbi, segno));
-	if (type == CURSEG_WARM_DATA || type == CURSEG_COLD_DATA)
+	if (seg_type == CURSEG_WARM_DATA || seg_type == CURSEG_COLD_DATA)
 		dir = ALLOC_RIGHT;
 
 	if (test_opt(sbi, NOHEAP))
@@ -2594,7 +2650,7 @@ static void __refresh_next_blkoff(struct f2fs_sb_info *sbi,
  * This function always allocates a used segment(from dirty seglist) by SSR
  * manner, so it should recover the existing segment information of valid blocks
  */
-static void change_curseg(struct f2fs_sb_info *sbi, int type)
+static void change_curseg(struct f2fs_sb_info *sbi, int type, bool flush)
 {
 	struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
 	struct curseg_info *curseg = CURSEG_I(sbi, type);
@@ -2602,8 +2658,10 @@ static void change_curseg(struct f2fs_sb_info *sbi, int type)
 	struct f2fs_summary_block *sum_node;
 	struct page *sum_page;
 
-	write_sum_page(sbi, curseg->sum_blk,
-				GET_SUM_BLOCK(sbi, curseg->segno));
+	if (flush)
+		write_sum_page(sbi, curseg->sum_blk,
+					GET_SUM_BLOCK(sbi, curseg->segno));
+
 	__set_test_and_inuse(sbi, new_segno);
 
 	mutex_lock(&dirty_i->seglist_lock);
@@ -2616,29 +2674,139 @@ static void change_curseg(struct f2fs_sb_info *sbi, int type)
 	__next_free_blkoff(sbi, curseg, 0);
 
 	sum_page = f2fs_get_sum_page(sbi, new_segno);
-	f2fs_bug_on(sbi, IS_ERR(sum_page));
+	if (IS_ERR(sum_page)) {
+		/* GC won't be able to use stale summary pages by cp_error */
+		memset(curseg->sum_blk, 0, SUM_ENTRY_SIZE);
+		return;
+	}
 	sum_node = (struct f2fs_summary_block *)page_address(sum_page);
 	memcpy(curseg->sum_blk, sum_node, SUM_ENTRY_SIZE);
 	f2fs_put_page(sum_page, 1);
 }
 
-static int get_ssr_segment(struct f2fs_sb_info *sbi, int type)
+static int get_ssr_segment(struct f2fs_sb_info *sbi, int type,
+				int alloc_mode, unsigned long long age);
+
+static void get_atssr_segment(struct f2fs_sb_info *sbi, int type,
+					int target_type, int alloc_mode,
+					unsigned long long age)
+{
+	struct curseg_info *curseg = CURSEG_I(sbi, type);
+
+	curseg->seg_type = target_type;
+
+	if (get_ssr_segment(sbi, type, alloc_mode, age)) {
+		struct seg_entry *se = get_seg_entry(sbi, curseg->next_segno);
+
+		curseg->seg_type = se->type;
+		change_curseg(sbi, type, true);
+	} else {
+		/* allocate cold segment by default */
+		curseg->seg_type = CURSEG_COLD_DATA;
+		new_curseg(sbi, type, true);
+	}
+	stat_inc_seg_type(sbi, curseg);
+}
+
+static void __f2fs_init_atgc_curseg(struct f2fs_sb_info *sbi)
+{
+	struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_ALL_DATA_ATGC);
+
+	if (!sbi->am.atgc_enabled)
+		return;
+
+	down_read(&SM_I(sbi)->curseg_lock);
+
+	mutex_lock(&curseg->curseg_mutex);
+	down_write(&SIT_I(sbi)->sentry_lock);
+
+	get_atssr_segment(sbi, CURSEG_ALL_DATA_ATGC, CURSEG_COLD_DATA, SSR, 0);
+
+	up_write(&SIT_I(sbi)->sentry_lock);
+	mutex_unlock(&curseg->curseg_mutex);
+
+	up_read(&SM_I(sbi)->curseg_lock);
+
+}
+void f2fs_init_inmem_curseg(struct f2fs_sb_info *sbi)
+{
+	__f2fs_init_atgc_curseg(sbi);
+}
+
+static void __f2fs_save_inmem_curseg(struct f2fs_sb_info *sbi, int type)
+{
+	struct curseg_info *curseg = CURSEG_I(sbi, type);
+
+	mutex_lock(&curseg->curseg_mutex);
+	if (!curseg->inited)
+		goto out;
+
+	if (get_valid_blocks(sbi, curseg->segno, false)) {
+		write_sum_page(sbi, curseg->sum_blk,
+				GET_SUM_BLOCK(sbi, curseg->segno));
+	} else {
+		mutex_lock(&DIRTY_I(sbi)->seglist_lock);
+		__set_test_and_free(sbi, curseg->segno, true);
+		mutex_unlock(&DIRTY_I(sbi)->seglist_lock);
+	}
+out:
+	mutex_unlock(&curseg->curseg_mutex);
+}
+
+void f2fs_save_inmem_curseg(struct f2fs_sb_info *sbi)
+{
+	__f2fs_save_inmem_curseg(sbi, CURSEG_COLD_DATA_PINNED);
+
+	if (sbi->am.atgc_enabled)
+		__f2fs_save_inmem_curseg(sbi, CURSEG_ALL_DATA_ATGC);
+}
+
+static void __f2fs_restore_inmem_curseg(struct f2fs_sb_info *sbi, int type)
+{
+	struct curseg_info *curseg = CURSEG_I(sbi, type);
+
+	mutex_lock(&curseg->curseg_mutex);
+	if (!curseg->inited)
+		goto out;
+	if (get_valid_blocks(sbi, curseg->segno, false))
+		goto out;
+
+	mutex_lock(&DIRTY_I(sbi)->seglist_lock);
+	__set_test_and_inuse(sbi, curseg->segno);
+	mutex_unlock(&DIRTY_I(sbi)->seglist_lock);
+out:
+	mutex_unlock(&curseg->curseg_mutex);
+}
+
+void f2fs_restore_inmem_curseg(struct f2fs_sb_info *sbi)
+{
+	__f2fs_restore_inmem_curseg(sbi, CURSEG_COLD_DATA_PINNED);
+
+	if (sbi->am.atgc_enabled)
+		__f2fs_restore_inmem_curseg(sbi, CURSEG_ALL_DATA_ATGC);
+}
+
+static int get_ssr_segment(struct f2fs_sb_info *sbi, int type,
+				int alloc_mode, unsigned long long age)
 {
 	struct curseg_info *curseg = CURSEG_I(sbi, type);
 	const struct victim_selection *v_ops = DIRTY_I(sbi)->v_ops;
 	unsigned segno = NULL_SEGNO;
+	unsigned short seg_type = curseg->seg_type;
 	int i, cnt;
 	bool reversed = false;
 
+	sanity_check_seg_type(sbi, seg_type);
+
 	/* f2fs_need_SSR() already forces to do this */
-	if (!v_ops->get_victim(sbi, &segno, BG_GC, type, SSR)) {
+	if (!v_ops->get_victim(sbi, &segno, BG_GC, seg_type, alloc_mode, age)) {
 		curseg->next_segno = segno;
 		return 1;
 	}
 
 	/* For node segments, let's do SSR more intensively */
-	if (IS_NODESEG(type)) {
-		if (type >= CURSEG_WARM_NODE) {
+	if (IS_NODESEG(seg_type)) {
+		if (seg_type >= CURSEG_WARM_NODE) {
 			reversed = true;
 			i = CURSEG_COLD_NODE;
 		} else {
@@ -2646,7 +2814,7 @@ static int get_ssr_segment(struct f2fs_sb_info *sbi, int type)
 		}
 		cnt = NR_CURSEG_NODE_TYPE;
 	} else {
-		if (type >= CURSEG_WARM_DATA) {
+		if (seg_type >= CURSEG_WARM_DATA) {
 			reversed = true;
 			i = CURSEG_COLD_DATA;
 		} else {
@@ -2656,9 +2824,9 @@ static int get_ssr_segment(struct f2fs_sb_info *sbi, int type)
 	}
 
 	for (; cnt-- > 0; reversed ? i-- : i++) {
-		if (i == type)
+		if (i == seg_type)
 			continue;
-		if (!v_ops->get_victim(sbi, &segno, BG_GC, i, SSR)) {
+		if (!v_ops->get_victim(sbi, &segno, BG_GC, i, alloc_mode, age)) {
 			curseg->next_segno = segno;
 			return 1;
 		}
@@ -2687,13 +2855,15 @@ static void allocate_segment_by_default(struct f2fs_sb_info *sbi,
 	if (force)
 		new_curseg(sbi, type, true);
 	else if (!is_set_ckpt_flags(sbi, CP_CRC_RECOVERY_FLAG) &&
-					type == CURSEG_WARM_NODE)
+					curseg->seg_type == CURSEG_WARM_NODE)
 		new_curseg(sbi, type, false);
-	else if (curseg->alloc_type == LFS && is_next_segment_free(sbi, type) &&
+	else if (curseg->alloc_type == LFS &&
+			is_next_segment_free(sbi, curseg, type) &&
 			likely(!is_sbi_flag_set(sbi, SBI_CP_DISABLED)))
 		new_curseg(sbi, type, false);
-	else if (f2fs_need_SSR(sbi) && get_ssr_segment(sbi, type))
-		change_curseg(sbi, type);
+	else if (f2fs_need_SSR(sbi) &&
+			get_ssr_segment(sbi, type, SSR, 0))
+		change_curseg(sbi, type, true);
 	else
 		new_curseg(sbi, type, false);
 
@@ -2714,8 +2884,8 @@ void f2fs_allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type,
 	if (segno < start || segno > end)
 		goto unlock;
 
-	if (f2fs_need_SSR(sbi) && get_ssr_segment(sbi, type))
-		change_curseg(sbi, type);
+	if (f2fs_need_SSR(sbi) && get_ssr_segment(sbi, type, SSR, 0))
+		change_curseg(sbi, type, true);
 	else
 		new_curseg(sbi, type, true);
 
@@ -2738,11 +2908,15 @@ static void __allocate_new_segment(struct f2fs_sb_info *sbi, int type)
 	struct curseg_info *curseg = CURSEG_I(sbi, type);
 	unsigned int old_segno;
 
+	if (!curseg->inited)
+		goto alloc;
+
 	if (!curseg->next_blkoff &&
 		!get_valid_blocks(sbi, curseg->segno, false) &&
 		!get_ckpt_valid_blocks(sbi, curseg->segno))
 		return;
 
+alloc:
 	old_segno = curseg->segno;
 	SIT_I(sbi)->s_ops->allocate_segment(sbi, type, true);
 	locate_dirty_segment(sbi, old_segno);
@@ -2806,7 +2980,7 @@ next:
 	mutex_lock(&dcc->cmd_lock);
 	if (unlikely(dcc->rbtree_check))
 		f2fs_bug_on(sbi, !f2fs_check_rb_tree_consistence(sbi,
-								&dcc->root));
+							&dcc->root, false));
 
 	dc = (struct discard_cmd *)f2fs_lookup_rb_tree_ret(&dcc->root,
 					NULL, start,
@@ -2930,12 +3104,11 @@ out:
 	return err;
 }
 
-static bool __has_curseg_space(struct f2fs_sb_info *sbi, int type)
+static bool __has_curseg_space(struct f2fs_sb_info *sbi,
+					struct curseg_info *curseg)
 {
-	struct curseg_info *curseg = CURSEG_I(sbi, type);
-	if (curseg->next_blkoff < sbi->blocks_per_seg)
-		return true;
-	return false;
+	return curseg->next_blkoff < f2fs_usable_blks_in_seg(sbi,
+							curseg->segno);
 }
 
 int f2fs_rw_hint_to_seg_type(enum rw_hint hint)
@@ -3075,8 +3248,13 @@ static int __get_segment_type_6(struct f2fs_io_info *fio)
 	if (fio->type == DATA) {
 		struct inode *inode = fio->page->mapping->host;
 
-		if (is_cold_data(fio->page) || file_is_cold(inode) ||
-				f2fs_compressed_file(inode))
+		if (is_cold_data(fio->page)) {
+			if (fio->sbi->am.atgc_enabled)
+				return CURSEG_ALL_DATA_ATGC;
+			else
+				return CURSEG_COLD_DATA;
+		}
+		if (file_is_cold(inode) || f2fs_compressed_file(inode))
 			return CURSEG_COLD_DATA;
 		if (file_is_hot(inode) ||
 				is_inode_flag_set(inode, FI_HOT_DATA) ||
@@ -3126,27 +3304,25 @@ void f2fs_allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
 {
 	struct sit_info *sit_i = SIT_I(sbi);
 	struct curseg_info *curseg = CURSEG_I(sbi, type);
-	bool put_pin_sem = false;
-
-	if (type == CURSEG_COLD_DATA) {
-		/* GC during CURSEG_COLD_DATA_PINNED allocation */
-		if (down_read_trylock(&sbi->pin_sem)) {
-			put_pin_sem = true;
-		} else {
-			type = CURSEG_WARM_DATA;
-			curseg = CURSEG_I(sbi, type);
-		}
-	} else if (type == CURSEG_COLD_DATA_PINNED) {
-		type = CURSEG_COLD_DATA;
-	}
+	unsigned long long old_mtime;
+	bool from_gc = (type == CURSEG_ALL_DATA_ATGC);
+	struct seg_entry *se = NULL;
 
 	down_read(&SM_I(sbi)->curseg_lock);
 
 	mutex_lock(&curseg->curseg_mutex);
 	down_write(&sit_i->sentry_lock);
 
+	if (from_gc) {
+		f2fs_bug_on(sbi, GET_SEGNO(sbi, old_blkaddr) == NULL_SEGNO);
+		se = get_seg_entry(sbi, GET_SEGNO(sbi, old_blkaddr));
+		sanity_check_seg_type(sbi, se->type);
+		f2fs_bug_on(sbi, IS_NODESEG(se->type));
+	}
 	*new_blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
 
+	f2fs_bug_on(sbi, curseg->next_blkoff >= sbi->blocks_per_seg);
+
 	f2fs_wait_discard_bio(sbi, *new_blkaddr);
 
 	/*
@@ -3160,6 +3336,14 @@ void f2fs_allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
 
 	stat_inc_block_count(sbi, curseg);
 
+	if (from_gc) {
+		old_mtime = get_segment_mtime(sbi, old_blkaddr);
+	} else {
+		update_segment_mtime(sbi, old_blkaddr, 0);
+		old_mtime = 0;
+	}
+	update_segment_mtime(sbi, *new_blkaddr, old_mtime);
+
 	/*
 	 * SIT information should be updated before segment allocation,
 	 * since SSR needs latest valid block information.
@@ -3168,9 +3352,13 @@ void f2fs_allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
 	if (GET_SEGNO(sbi, old_blkaddr) != NULL_SEGNO)
 		update_sit_entry(sbi, old_blkaddr, -1);
 
-	if (!__has_curseg_space(sbi, type))
-		sit_i->s_ops->allocate_segment(sbi, type, false);
-
+	if (!__has_curseg_space(sbi, curseg)) {
+		if (from_gc)
+			get_atssr_segment(sbi, type, se->type,
+						AT_SSR, se->mtime);
+		else
+			sit_i->s_ops->allocate_segment(sbi, type, false);
+	}
 	/*
 	 * segment dirty status should be updated after segment allocation,
 	 * so we just need to update status only one time after previous
@@ -3204,9 +3392,6 @@ void f2fs_allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
 	mutex_unlock(&curseg->curseg_mutex);
 
 	up_read(&SM_I(sbi)->curseg_lock);
-
-	if (put_pin_sem)
-		up_read(&sbi->pin_sem);
 }
 
 static void update_device_state(struct f2fs_io_info *fio)
@@ -3355,7 +3540,8 @@ static inline int __f2fs_get_curseg(struct f2fs_sb_info *sbi,
 
 void f2fs_do_replace_block(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
 				block_t old_blkaddr, block_t new_blkaddr,
-				bool recover_curseg, bool recover_newaddr)
+				bool recover_curseg, bool recover_newaddr,
+				bool from_gc)
 {
 	struct sit_info *sit_i = SIT_I(sbi);
 	struct curseg_info *curseg;
@@ -3400,17 +3586,22 @@ void f2fs_do_replace_block(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
 	/* change the current segment */
 	if (segno != curseg->segno) {
 		curseg->next_segno = segno;
-		change_curseg(sbi, type);
+		change_curseg(sbi, type, true);
 	}
 
 	curseg->next_blkoff = GET_BLKOFF_FROM_SEG0(sbi, new_blkaddr);
 	__add_sum_entry(sbi, type, sum);
 
-	if (!recover_curseg || recover_newaddr)
+	if (!recover_curseg || recover_newaddr) {
+		if (!from_gc)
+			update_segment_mtime(sbi, new_blkaddr, 0);
 		update_sit_entry(sbi, new_blkaddr, 1);
+	}
 	if (GET_SEGNO(sbi, old_blkaddr) != NULL_SEGNO) {
 		invalidate_mapping_pages(META_MAPPING(sbi),
 					old_blkaddr, old_blkaddr);
+		if (!from_gc)
+			update_segment_mtime(sbi, old_blkaddr, 0);
 		update_sit_entry(sbi, old_blkaddr, -1);
 	}
 
@@ -3422,7 +3613,7 @@ void f2fs_do_replace_block(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
 	if (recover_curseg) {
 		if (old_cursegno != curseg->segno) {
 			curseg->next_segno = old_cursegno;
-			change_curseg(sbi, type);
+			change_curseg(sbi, type, true);
 		}
 		curseg->next_blkoff = old_blkoff;
 	}
@@ -3442,7 +3633,7 @@ void f2fs_replace_block(struct f2fs_sb_info *sbi, struct dnode_of_data *dn,
 	set_summary(&sum, dn->nid, dn->ofs_in_node, version);
 
 	f2fs_do_replace_block(sbi, &sum, old_addr, new_addr,
-					recover_curseg, recover_newaddr);
+					recover_curseg, recover_newaddr, false);
 
 	f2fs_update_data_blkaddr(dn, new_addr);
 }
@@ -3574,7 +3765,7 @@ static int read_normal_summaries(struct f2fs_sb_info *sbi, int type)
 		blk_off = le16_to_cpu(ckpt->cur_data_blkoff[type -
 							CURSEG_HOT_DATA]);
 		if (__exist_node_summaries(sbi))
-			blk_addr = sum_blk_addr(sbi, NR_CURSEG_TYPE, type);
+			blk_addr = sum_blk_addr(sbi, NR_CURSEG_PERSIST_TYPE, type);
 		else
 			blk_addr = sum_blk_addr(sbi, NR_CURSEG_DATA_TYPE, type);
 	} else {
@@ -3652,8 +3843,9 @@ static int restore_curseg_summaries(struct f2fs_sb_info *sbi)
 	}
 
 	if (__exist_node_summaries(sbi))
-		f2fs_ra_meta_pages(sbi, sum_blk_addr(sbi, NR_CURSEG_TYPE, type),
-					NR_CURSEG_TYPE - type, META_CP, true);
+		f2fs_ra_meta_pages(sbi,
+				sum_blk_addr(sbi, NR_CURSEG_PERSIST_TYPE, type),
+				NR_CURSEG_PERSIST_TYPE - type, META_CP, true);
 
 	for (; type <= CURSEG_COLD_NODE; type++) {
 		err = read_normal_summaries(sbi, type);
@@ -3781,7 +3973,7 @@ int f2fs_lookup_journal_in_cursum(struct f2fs_journal *journal, int type,
 static struct page *get_current_sit_page(struct f2fs_sb_info *sbi,
 					unsigned int segno)
 {
-	return f2fs_get_meta_page_nofail(sbi, current_sit_addr(sbi, segno));
+	return f2fs_get_meta_page(sbi, current_sit_addr(sbi, segno));
 }
 
 static struct page *get_next_sit_page(struct f2fs_sb_info *sbi,
@@ -4155,14 +4347,14 @@ static int build_curseg(struct f2fs_sb_info *sbi)
 	struct curseg_info *array;
 	int i;
 
-	array = f2fs_kzalloc(sbi, array_size(NR_CURSEG_TYPE, sizeof(*array)),
-			     GFP_KERNEL);
+	array = f2fs_kzalloc(sbi, array_size(NR_CURSEG_TYPE,
+					sizeof(*array)), GFP_KERNEL);
 	if (!array)
 		return -ENOMEM;
 
 	SM_I(sbi)->curseg_array = array;
 
-	for (i = 0; i < NR_CURSEG_TYPE; i++) {
+	for (i = 0; i < NO_CHECK_TYPE; i++) {
 		mutex_init(&array[i].curseg_mutex);
 		array[i].sum_blk = f2fs_kzalloc(sbi, PAGE_SIZE, GFP_KERNEL);
 		if (!array[i].sum_blk)
@@ -4172,8 +4364,15 @@ static int build_curseg(struct f2fs_sb_info *sbi)
 				sizeof(struct f2fs_journal), GFP_KERNEL);
 		if (!array[i].journal)
 			return -ENOMEM;
+		if (i < NR_PERSISTENT_LOG)
+			array[i].seg_type = CURSEG_HOT_DATA + i;
+		else if (i == CURSEG_COLD_DATA_PINNED)
+			array[i].seg_type = CURSEG_COLD_DATA;
+		else if (i == CURSEG_ALL_DATA_ATGC)
+			array[i].seg_type = CURSEG_COLD_DATA;
 		array[i].segno = NULL_SEGNO;
 		array[i].next_blkoff = 0;
+		array[i].inited = false;
 	}
 	return restore_curseg_summaries(sbi);
 }
@@ -4294,9 +4493,12 @@ static void init_free_segmap(struct f2fs_sb_info *sbi)
 {
 	unsigned int start;
 	int type;
+	struct seg_entry *sentry;
 
 	for (start = 0; start < MAIN_SEGS(sbi); start++) {
-		struct seg_entry *sentry = get_seg_entry(sbi, start);
+		if (f2fs_usable_blks_in_seg(sbi, start) == 0)
+			continue;
+		sentry = get_seg_entry(sbi, start);
 		if (!sentry->valid_blocks)
 			__set_free(sbi, start);
 		else
@@ -4316,7 +4518,7 @@ static void init_dirty_segmap(struct f2fs_sb_info *sbi)
 	struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
 	struct free_segmap_info *free_i = FREE_I(sbi);
 	unsigned int segno = 0, offset = 0, secno;
-	block_t valid_blocks;
+	block_t valid_blocks, usable_blks_in_seg;
 	block_t blks_per_sec = BLKS_PER_SEC(sbi);
 
 	while (1) {
@@ -4326,9 +4528,10 @@ static void init_dirty_segmap(struct f2fs_sb_info *sbi)
 			break;
 		offset = segno + 1;
 		valid_blocks = get_valid_blocks(sbi, segno, false);
-		if (valid_blocks == sbi->blocks_per_seg || !valid_blocks)
+		usable_blks_in_seg = f2fs_usable_blks_in_seg(sbi, segno);
+		if (valid_blocks == usable_blks_in_seg || !valid_blocks)
 			continue;
-		if (valid_blocks > sbi->blocks_per_seg) {
+		if (valid_blocks > usable_blks_in_seg) {
 			f2fs_bug_on(sbi, 1);
 			continue;
 		}
@@ -4408,11 +4611,13 @@ static int sanity_check_curseg(struct f2fs_sb_info *sbi)
 	 * In LFS/SSR curseg, .next_blkoff should point to an unused blkaddr;
 	 * In LFS curseg, all blkaddr after .next_blkoff should be unused.
 	 */
-	for (i = 0; i < NO_CHECK_TYPE; i++) {
+	for (i = 0; i < NR_PERSISTENT_LOG; i++) {
 		struct curseg_info *curseg = CURSEG_I(sbi, i);
 		struct seg_entry *se = get_seg_entry(sbi, curseg->segno);
 		unsigned int blkofs = curseg->next_blkoff;
 
+		sanity_check_seg_type(sbi, curseg->seg_type);
+
 		if (f2fs_test_bit(blkofs, se->cur_valid_map))
 			goto out;
 
@@ -4637,7 +4842,7 @@ int f2fs_fix_curseg_write_pointer(struct f2fs_sb_info *sbi)
 {
 	int i, ret;
 
-	for (i = 0; i < NO_CHECK_TYPE; i++) {
+	for (i = 0; i < NR_PERSISTENT_LOG; i++) {
 		ret = fix_curseg_write_pointer(sbi, i);
 		if (ret)
 			return ret;
@@ -4678,6 +4883,101 @@ int f2fs_check_write_pointer(struct f2fs_sb_info *sbi)
 
 	return 0;
 }
+
+static bool is_conv_zone(struct f2fs_sb_info *sbi, unsigned int zone_idx,
+						unsigned int dev_idx)
+{
+	if (!bdev_is_zoned(FDEV(dev_idx).bdev))
+		return true;
+	return !test_bit(zone_idx, FDEV(dev_idx).blkz_seq);
+}
+
+/* Return the zone index in the given device */
+static unsigned int get_zone_idx(struct f2fs_sb_info *sbi, unsigned int secno,
+					int dev_idx)
+{
+	block_t sec_start_blkaddr = START_BLOCK(sbi, GET_SEG_FROM_SEC(sbi, secno));
+
+	return (sec_start_blkaddr - FDEV(dev_idx).start_blk) >>
+						sbi->log_blocks_per_blkz;
+}
+
+/*
+ * Return the usable segments in a section based on the zone's
+ * corresponding zone capacity. Zone is equal to a section.
+ */
+static inline unsigned int f2fs_usable_zone_segs_in_sec(
+		struct f2fs_sb_info *sbi, unsigned int segno)
+{
+	unsigned int dev_idx, zone_idx, unusable_segs_in_sec;
+
+	dev_idx = f2fs_target_device_index(sbi, START_BLOCK(sbi, segno));
+	zone_idx = get_zone_idx(sbi, GET_SEC_FROM_SEG(sbi, segno), dev_idx);
+
+	/* Conventional zone's capacity is always equal to zone size */
+	if (is_conv_zone(sbi, zone_idx, dev_idx))
+		return sbi->segs_per_sec;
+
+	/*
+	 * If the zone_capacity_blocks array is NULL, then zone capacity
+	 * is equal to the zone size for all zones
+	 */
+	if (!FDEV(dev_idx).zone_capacity_blocks)
+		return sbi->segs_per_sec;
+
+	/* Get the segment count beyond zone capacity block */
+	unusable_segs_in_sec = (sbi->blocks_per_blkz -
+				FDEV(dev_idx).zone_capacity_blocks[zone_idx]) >>
+				sbi->log_blocks_per_seg;
+	return sbi->segs_per_sec - unusable_segs_in_sec;
+}
+
+/*
+ * Return the number of usable blocks in a segment. The number of blocks
+ * returned is always equal to the number of blocks in a segment for
+ * segments fully contained within a sequential zone capacity or a
+ * conventional zone. For segments partially contained in a sequential
+ * zone capacity, the number of usable blocks up to the zone capacity
+ * is returned. 0 is returned in all other cases.
+ */
+static inline unsigned int f2fs_usable_zone_blks_in_seg(
+			struct f2fs_sb_info *sbi, unsigned int segno)
+{
+	block_t seg_start, sec_start_blkaddr, sec_cap_blkaddr;
+	unsigned int zone_idx, dev_idx, secno;
+
+	secno = GET_SEC_FROM_SEG(sbi, segno);
+	seg_start = START_BLOCK(sbi, segno);
+	dev_idx = f2fs_target_device_index(sbi, seg_start);
+	zone_idx = get_zone_idx(sbi, secno, dev_idx);
+
+	/*
+	 * Conventional zone's capacity is always equal to zone size,
+	 * so, blocks per segment is unchanged.
+	 */
+	if (is_conv_zone(sbi, zone_idx, dev_idx))
+		return sbi->blocks_per_seg;
+
+	if (!FDEV(dev_idx).zone_capacity_blocks)
+		return sbi->blocks_per_seg;
+
+	sec_start_blkaddr = START_BLOCK(sbi, GET_SEG_FROM_SEC(sbi, secno));
+	sec_cap_blkaddr = sec_start_blkaddr +
+				FDEV(dev_idx).zone_capacity_blocks[zone_idx];
+
+	/*
+	 * If segment starts before zone capacity and spans beyond
+	 * zone capacity, then usable blocks are from seg start to
+	 * zone capacity. If the segment starts after the zone capacity,
+	 * then there are no usable blocks.
+	 */
+	if (seg_start >= sec_cap_blkaddr)
+		return 0;
+	if (seg_start + sbi->blocks_per_seg > sec_cap_blkaddr)
+		return sec_cap_blkaddr - seg_start;
+
+	return sbi->blocks_per_seg;
+}
 #else
 int f2fs_fix_curseg_write_pointer(struct f2fs_sb_info *sbi)
 {
@@ -4688,7 +4988,36 @@ int f2fs_check_write_pointer(struct f2fs_sb_info *sbi)
 {
 	return 0;
 }
+
+static inline unsigned int f2fs_usable_zone_blks_in_seg(struct f2fs_sb_info *sbi,
+							unsigned int segno)
+{
+	return 0;
+}
+
+static inline unsigned int f2fs_usable_zone_segs_in_sec(struct f2fs_sb_info *sbi,
+							unsigned int segno)
+{
+	return 0;
+}
 #endif
+unsigned int f2fs_usable_blks_in_seg(struct f2fs_sb_info *sbi,
+					unsigned int segno)
+{
+	if (f2fs_sb_has_blkzoned(sbi))
+		return f2fs_usable_zone_blks_in_seg(sbi, segno);
+
+	return sbi->blocks_per_seg;
+}
+
+unsigned int f2fs_usable_segs_in_sec(struct f2fs_sb_info *sbi,
+					unsigned int segno)
+{
+	if (f2fs_sb_has_blkzoned(sbi))
+		return f2fs_usable_zone_segs_in_sec(sbi, segno);
+
+	return sbi->segs_per_sec;
+}
 
 /*
  * Update min, max modified time for cost-benefit GC algorithm
@@ -4715,6 +5044,7 @@ static void init_min_max_mtime(struct f2fs_sb_info *sbi)
 			sit_i->min_mtime = mtime;
 	}
 	sit_i->max_mtime = get_mtime(sbi, false);
+	sit_i->dirty_max_mtime = 0;
 	up_write(&sit_i->sentry_lock);
 }
 
@@ -4830,7 +5160,7 @@ static void destroy_dirty_segmap(struct f2fs_sb_info *sbi)
 
 	destroy_victim_secmap(sbi);
 	SM_I(sbi)->dirty_info = NULL;
-	kvfree(dirty_i);
+	kfree(dirty_i);
 }
 
 static void destroy_curseg(struct f2fs_sb_info *sbi)
@@ -4842,10 +5172,10 @@ static void destroy_curseg(struct f2fs_sb_info *sbi)
 		return;
 	SM_I(sbi)->curseg_array = NULL;
 	for (i = 0; i < NR_CURSEG_TYPE; i++) {
-		kvfree(array[i].sum_blk);
-		kvfree(array[i].journal);
+		kfree(array[i].sum_blk);
+		kfree(array[i].journal);
 	}
-	kvfree(array);
+	kfree(array);
 }
 
 static void destroy_free_segmap(struct f2fs_sb_info *sbi)
@@ -4856,7 +5186,7 @@ static void destroy_free_segmap(struct f2fs_sb_info *sbi)
 	SM_I(sbi)->free_info = NULL;
 	kvfree(free_i->free_segmap);
 	kvfree(free_i->free_secmap);
-	kvfree(free_i);
+	kfree(free_i);
 }
 
 static void destroy_sit_info(struct f2fs_sb_info *sbi)
@@ -4868,7 +5198,7 @@ static void destroy_sit_info(struct f2fs_sb_info *sbi)
 
 	if (sit_i->sentries)
 		kvfree(sit_i->bitmap);
-	kvfree(sit_i->tmp_map);
+	kfree(sit_i->tmp_map);
 
 	kvfree(sit_i->sentries);
 	kvfree(sit_i->sec_entries);
@@ -4880,7 +5210,7 @@ static void destroy_sit_info(struct f2fs_sb_info *sbi)
 	kvfree(sit_i->sit_bitmap_mir);
 	kvfree(sit_i->invalid_segmap);
 #endif
-	kvfree(sit_i);
+	kfree(sit_i);
 }
 
 void f2fs_destroy_segment_manager(struct f2fs_sb_info *sbi)
@@ -4896,7 +5226,7 @@ void f2fs_destroy_segment_manager(struct f2fs_sb_info *sbi)
 	destroy_free_segmap(sbi);
 	destroy_sit_info(sbi);
 	sbi->sm_info = NULL;
-	kvfree(sm_info);
+	kfree(sm_info);
 }
 
 int __init f2fs_create_segment_manager_caches(void)
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index 752b177073b2..e81eb0748e2a 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -16,13 +16,20 @@
 #define DEF_MAX_RECLAIM_PREFREE_SEGMENTS	4096	/* 8GB in maximum */
 
 #define F2FS_MIN_SEGMENTS	9 /* SB + 2 (CP + SIT + NAT) + SSA + MAIN */
+#define F2FS_MIN_META_SEGMENTS	8 /* SB + 2 (CP + SIT + NAT) + SSA */
 
 /* L: Logical segment # in volume, R: Relative segment # in main area */
 #define GET_L2R_SEGNO(free_i, segno)	((segno) - (free_i)->start_segno)
 #define GET_R2L_SEGNO(free_i, segno)	((segno) + (free_i)->start_segno)
 
 #define IS_DATASEG(t)	((t) <= CURSEG_COLD_DATA)
-#define IS_NODESEG(t)	((t) >= CURSEG_HOT_NODE)
+#define IS_NODESEG(t)	((t) >= CURSEG_HOT_NODE && (t) <= CURSEG_COLD_NODE)
+
+static inline void sanity_check_seg_type(struct f2fs_sb_info *sbi,
+						unsigned short seg_type)
+{
+	f2fs_bug_on(sbi, seg_type >= NR_PERSISTENT_LOG);
+}
 
 #define IS_HOT(t)	((t) == CURSEG_HOT_NODE || (t) == CURSEG_HOT_DATA)
 #define IS_WARM(t)	((t) == CURSEG_WARM_NODE || (t) == CURSEG_WARM_DATA)
@@ -34,7 +41,9 @@
 	 ((seg) == CURSEG_I(sbi, CURSEG_COLD_DATA)->segno) ||	\
 	 ((seg) == CURSEG_I(sbi, CURSEG_HOT_NODE)->segno) ||	\
 	 ((seg) == CURSEG_I(sbi, CURSEG_WARM_NODE)->segno) ||	\
-	 ((seg) == CURSEG_I(sbi, CURSEG_COLD_NODE)->segno))
+	 ((seg) == CURSEG_I(sbi, CURSEG_COLD_NODE)->segno) ||	\
+	 ((seg) == CURSEG_I(sbi, CURSEG_COLD_DATA_PINNED)->segno) ||	\
+	 ((seg) == CURSEG_I(sbi, CURSEG_ALL_DATA_ATGC)->segno))
 
 #define IS_CURSEC(sbi, secno)						\
 	(((secno) == CURSEG_I(sbi, CURSEG_HOT_DATA)->segno /		\
@@ -48,7 +57,11 @@
 	 ((secno) == CURSEG_I(sbi, CURSEG_WARM_NODE)->segno /		\
 	  (sbi)->segs_per_sec) ||	\
 	 ((secno) == CURSEG_I(sbi, CURSEG_COLD_NODE)->segno /		\
-	  (sbi)->segs_per_sec))	\
+	  (sbi)->segs_per_sec) ||	\
+	 ((secno) == CURSEG_I(sbi, CURSEG_COLD_DATA_PINNED)->segno /	\
+	  (sbi)->segs_per_sec) ||	\
+	 ((secno) == CURSEG_I(sbi, CURSEG_ALL_DATA_ATGC)->segno /	\
+	  (sbi)->segs_per_sec))
 
 #define MAIN_BLKADDR(sbi)						\
 	(SM_I(sbi) ? SM_I(sbi)->main_blkaddr : 				\
@@ -132,20 +145,25 @@ enum {
  * In the victim_sel_policy->alloc_mode, there are two block allocation modes.
  * LFS writes data sequentially with cleaning operations.
  * SSR (Slack Space Recycle) reuses obsolete space without cleaning operations.
+ * AT_SSR (Age Threshold based Slack Space Recycle) merges fragments into
+ * fragmented segment which has similar aging degree.
  */
 enum {
 	LFS = 0,
-	SSR
+	SSR,
+	AT_SSR,
 };
 
 /*
  * In the victim_sel_policy->gc_mode, there are two gc, aka cleaning, modes.
  * GC_CB is based on cost-benefit algorithm.
  * GC_GREEDY is based on greedy algorithm.
+ * GC_AT is based on age-threshold algorithm.
  */
 enum {
 	GC_CB = 0,
 	GC_GREEDY,
+	GC_AT,
 	ALLOC_NEXT,
 	FLUSH_DEVICE,
 	MAX_GC_POLICY,
@@ -174,7 +192,10 @@ struct victim_sel_policy {
 	unsigned int offset;		/* last scanned bitmap offset */
 	unsigned int ofs_unit;		/* bitmap search unit */
 	unsigned int min_cost;		/* minimum cost */
+	unsigned long long oldest_age;	/* oldest age of segments having the same min cost */
 	unsigned int min_segno;		/* segment # having min. cost */
+	unsigned long long age;		/* mtime of GCed section*/
+	unsigned long long age_threshold;/* age threshold */
 };
 
 struct seg_entry {
@@ -240,6 +261,8 @@ struct sit_info {
 	unsigned long long mounted_time;	/* mount time */
 	unsigned long long min_mtime;		/* min. modification time */
 	unsigned long long max_mtime;		/* max. modification time */
+	unsigned long long dirty_min_mtime;	/* rerange candidates in GC_AT */
+	unsigned long long dirty_max_mtime;	/* rerange candidates in GC_AT */
 
 	unsigned int last_victim[MAX_GC_POLICY]; /* last victim segment # */
 };
@@ -278,7 +301,7 @@ struct dirty_seglist_info {
 /* victim selection function for cleaning and SSR */
 struct victim_selection {
 	int (*get_victim)(struct f2fs_sb_info *, unsigned int *,
-							int, int, char);
+					int, int, char, unsigned long long);
 };
 
 /* for active log information */
@@ -288,10 +311,12 @@ struct curseg_info {
 	struct rw_semaphore journal_rwsem;	/* protect journal area */
 	struct f2fs_journal *journal;		/* cached journal info */
 	unsigned char alloc_type;		/* current allocation type */
+	unsigned short seg_type;		/* segment type like CURSEG_XXX_TYPE */
 	unsigned int segno;			/* current segment number */
 	unsigned short next_blkoff;		/* next block offset to write */
 	unsigned int zone;			/* current zone number */
 	unsigned int next_segno;		/* preallocated segment */
+	bool inited;				/* indicate inmem log is inited */
 };
 
 struct sit_entry_set {
@@ -305,8 +330,6 @@ struct sit_entry_set {
  */
 static inline struct curseg_info *CURSEG_I(struct f2fs_sb_info *sbi, int type)
 {
-	if (type == CURSEG_COLD_DATA_PINNED)
-		type = CURSEG_COLD_DATA;
 	return (struct curseg_info *)(SM_I(sbi)->curseg_array + type);
 }
 
@@ -411,6 +434,7 @@ static inline void __set_free(struct f2fs_sb_info *sbi, unsigned int segno)
 	unsigned int secno = GET_SEC_FROM_SEG(sbi, segno);
 	unsigned int start_segno = GET_SEG_FROM_SEC(sbi, secno);
 	unsigned int next;
+	unsigned int usable_segs = f2fs_usable_segs_in_sec(sbi, segno);
 
 	spin_lock(&free_i->segmap_lock);
 	clear_bit(segno, free_i->free_segmap);
@@ -418,7 +442,7 @@ static inline void __set_free(struct f2fs_sb_info *sbi, unsigned int segno)
 
 	next = find_next_bit(free_i->free_segmap,
 			start_segno + sbi->segs_per_sec, start_segno);
-	if (next >= start_segno + sbi->segs_per_sec) {
+	if (next >= start_segno + usable_segs) {
 		clear_bit(secno, free_i->free_secmap);
 		free_i->free_sections++;
 	}
@@ -438,22 +462,23 @@ static inline void __set_inuse(struct f2fs_sb_info *sbi,
 }
 
 static inline void __set_test_and_free(struct f2fs_sb_info *sbi,
-		unsigned int segno)
+		unsigned int segno, bool inmem)
 {
 	struct free_segmap_info *free_i = FREE_I(sbi);
 	unsigned int secno = GET_SEC_FROM_SEG(sbi, segno);
 	unsigned int start_segno = GET_SEG_FROM_SEC(sbi, secno);
 	unsigned int next;
+	unsigned int usable_segs = f2fs_usable_segs_in_sec(sbi, segno);
 
 	spin_lock(&free_i->segmap_lock);
 	if (test_and_clear_bit(segno, free_i->free_segmap)) {
 		free_i->free_segments++;
 
-		if (IS_CURSEC(sbi, secno))
+		if (!inmem && IS_CURSEC(sbi, secno))
 			goto skip_free;
 		next = find_next_bit(free_i->free_segmap,
 				start_segno + sbi->segs_per_sec, start_segno);
-		if (next >= start_segno + sbi->segs_per_sec) {
+		if (next >= start_segno + usable_segs) {
 			if (test_and_clear_bit(secno, free_i->free_secmap))
 				free_i->free_sections++;
 		}
@@ -500,7 +525,7 @@ static inline unsigned int free_segments(struct f2fs_sb_info *sbi)
 	return FREE_I(sbi)->free_segments;
 }
 
-static inline int reserved_segments(struct f2fs_sb_info *sbi)
+static inline unsigned int reserved_segments(struct f2fs_sb_info *sbi)
 {
 	return SM_I(sbi)->reserved_segments;
 }
@@ -532,7 +557,7 @@ static inline int overprovision_segments(struct f2fs_sb_info *sbi)
 
 static inline int reserved_sections(struct f2fs_sb_info *sbi)
 {
-	return GET_SEC_FROM_SEG(sbi, (unsigned int)reserved_segments(sbi));
+	return GET_SEC_FROM_SEG(sbi, reserved_segments(sbi));
 }
 
 static inline bool has_curseg_enough_space(struct f2fs_sb_info *sbi)
@@ -546,8 +571,8 @@ static inline bool has_curseg_enough_space(struct f2fs_sb_info *sbi)
 	/* check current node segment */
 	for (i = CURSEG_HOT_NODE; i <= CURSEG_COLD_NODE; i++) {
 		segno = CURSEG_I(sbi, i)->segno;
-		left_blocks = sbi->blocks_per_seg -
-			get_seg_entry(sbi, segno)->ckpt_valid_blocks;
+		left_blocks = f2fs_usable_blks_in_seg(sbi, segno) -
+				get_seg_entry(sbi, segno)->ckpt_valid_blocks;
 
 		if (node_blocks > left_blocks)
 			return false;
@@ -555,7 +580,7 @@ static inline bool has_curseg_enough_space(struct f2fs_sb_info *sbi)
 
 	/* check current data segment */
 	segno = CURSEG_I(sbi, CURSEG_HOT_DATA)->segno;
-	left_blocks = sbi->blocks_per_seg -
+	left_blocks = f2fs_usable_blks_in_seg(sbi, segno) -
 			get_seg_entry(sbi, segno)->ckpt_valid_blocks;
 	if (dent_blocks > left_blocks)
 		return false;
@@ -677,21 +702,22 @@ static inline int check_block_count(struct f2fs_sb_info *sbi,
 	bool is_valid  = test_bit_le(0, raw_sit->valid_map) ? true : false;
 	int valid_blocks = 0;
 	int cur_pos = 0, next_pos;
+	unsigned int usable_blks_per_seg = f2fs_usable_blks_in_seg(sbi, segno);
 
 	/* check bitmap with valid block count */
 	do {
 		if (is_valid) {
 			next_pos = find_next_zero_bit_le(&raw_sit->valid_map,
-					sbi->blocks_per_seg,
+					usable_blks_per_seg,
 					cur_pos);
 			valid_blocks += next_pos - cur_pos;
 		} else
 			next_pos = find_next_bit_le(&raw_sit->valid_map,
-					sbi->blocks_per_seg,
+					usable_blks_per_seg,
 					cur_pos);
 		cur_pos = next_pos;
 		is_valid = !is_valid;
-	} while (cur_pos < sbi->blocks_per_seg);
+	} while (cur_pos < usable_blks_per_seg);
 
 	if (unlikely(GET_SIT_VBLOCKS(raw_sit) != valid_blocks)) {
 		f2fs_err(sbi, "Mismatch valid blocks %d vs. %d",
@@ -700,8 +726,13 @@ static inline int check_block_count(struct f2fs_sb_info *sbi,
 		return -EFSCORRUPTED;
 	}
 
+	if (usable_blks_per_seg < sbi->blocks_per_seg)
+		f2fs_bug_on(sbi, find_next_bit_le(&raw_sit->valid_map,
+				sbi->blocks_per_seg,
+				usable_blks_per_seg) != sbi->blocks_per_seg);
+
 	/* check segment usage, and check boundary of a given segment number */
-	if (unlikely(GET_SIT_VBLOCKS(raw_sit) > sbi->blocks_per_seg
+	if (unlikely(GET_SIT_VBLOCKS(raw_sit) > usable_blks_per_seg
 					|| segno > TOTAL_SEGS(sbi) - 1)) {
 		f2fs_err(sbi, "Wrong valid blocks %d or segno %u",
 			 GET_SIT_VBLOCKS(raw_sit), segno);
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index bef2be3fa3d0..0c958fed3392 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -146,6 +146,7 @@ enum {
 	Opt_compress_algorithm,
 	Opt_compress_log_size,
 	Opt_compress_extension,
+	Opt_atgc,
 	Opt_err,
 };
 
@@ -213,6 +214,7 @@ static match_table_t f2fs_tokens = {
 	{Opt_compress_algorithm, "compress_algorithm=%s"},
 	{Opt_compress_log_size, "compress_log_size=%u"},
 	{Opt_compress_extension, "compress_extension=%s"},
+	{Opt_atgc, "atgc"},
 	{Opt_err, NULL},
 };
 
@@ -580,7 +582,8 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
 		case Opt_active_logs:
 			if (args->from && match_int(args, &arg))
 				return -EINVAL;
-			if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
+			if (arg != 2 && arg != 4 &&
+				arg != NR_CURSEG_PERSIST_TYPE)
 				return -EINVAL;
 			F2FS_OPTION(sbi).active_logs = arg;
 			break;
@@ -868,8 +871,8 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
 #ifdef CONFIG_F2FS_FS_COMPRESSION
 		case Opt_compress_algorithm:
 			if (!f2fs_sb_has_compression(sbi)) {
-				f2fs_err(sbi, "Compression feature if off");
-				return -EINVAL;
+				f2fs_info(sbi, "Image doesn't support compression");
+				break;
 			}
 			name = match_strdup(&args[0]);
 			if (!name)
@@ -894,8 +897,8 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
 			break;
 		case Opt_compress_log_size:
 			if (!f2fs_sb_has_compression(sbi)) {
-				f2fs_err(sbi, "Compression feature is off");
-				return -EINVAL;
+				f2fs_info(sbi, "Image doesn't support compression");
+				break;
 			}
 			if (args->from && match_int(args, &arg))
 				return -EINVAL;
@@ -909,8 +912,8 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
 			break;
 		case Opt_compress_extension:
 			if (!f2fs_sb_has_compression(sbi)) {
-				f2fs_err(sbi, "Compression feature is off");
-				return -EINVAL;
+				f2fs_info(sbi, "Image doesn't support compression");
+				break;
 			}
 			name = match_strdup(&args[0]);
 			if (!name)
@@ -938,6 +941,9 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
 			f2fs_info(sbi, "compression options not supported");
 			break;
 #endif
+		case Opt_atgc:
+			set_opt(sbi, ATGC);
+			break;
 		default:
 			f2fs_err(sbi, "Unrecognized mount option \"%s\" or missing value",
 				 p);
@@ -964,6 +970,17 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
 		return -EINVAL;
 	}
 #endif
+	/*
+	 * The BLKZONED feature indicates that the drive was formatted with
+	 * zone alignment optimization. This is optional for host-aware
+	 * devices, but mandatory for host-managed zoned block devices.
+	 */
+#ifndef CONFIG_BLK_DEV_ZONED
+	if (f2fs_sb_has_blkzoned(sbi)) {
+		f2fs_err(sbi, "Zoned block device support is not enabled");
+		return -EINVAL;
+	}
+#endif
 
 	if (F2FS_IO_SIZE_BITS(sbi) && !f2fs_lfs_mode(sbi)) {
 		f2fs_err(sbi, "Should set mode=lfs with %uKB-sized IO",
@@ -1001,7 +1018,7 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
 	}
 
 	/* Not pass down write hints if the number of active logs is lesser
-	 * than NR_CURSEG_TYPE.
+	 * than NR_CURSEG_PERSIST_TYPE.
 	 */
 	if (F2FS_OPTION(sbi).active_logs != NR_CURSEG_TYPE)
 		F2FS_OPTION(sbi).whint_mode = WHINT_MODE_OFF;
@@ -1020,6 +1037,7 @@ static struct inode *f2fs_alloc_inode(struct super_block *sb)
 
 	/* Initialize f2fs-specific inode info */
 	atomic_set(&fi->dirty_pages, 0);
+	atomic_set(&fi->i_compr_blocks, 0);
 	init_rwsem(&fi->i_sem);
 	spin_lock_init(&fi->i_size_lock);
 	INIT_LIST_HEAD(&fi->dirty_list);
@@ -1184,6 +1202,7 @@ static void destroy_device_list(struct f2fs_sb_info *sbi)
 		blkdev_put(FDEV(i).bdev, FMODE_EXCL);
 #ifdef CONFIG_BLK_DEV_ZONED
 		kvfree(FDEV(i).blkz_seq);
+		kfree(FDEV(i).zone_capacity_blocks);
 #endif
 	}
 	kvfree(sbi->devs);
@@ -1269,6 +1288,7 @@ static void f2fs_put_super(struct super_block *sb)
 	kfree(sbi->raw_super);
 
 	destroy_device_list(sbi);
+	f2fs_destroy_page_array_cache(sbi);
 	f2fs_destroy_xattr_caches(sbi);
 	mempool_destroy(sbi->write_io_dummy);
 #ifdef CONFIG_QUOTA
@@ -1280,7 +1300,7 @@ static void f2fs_put_super(struct super_block *sb)
 	for (i = 0; i < NR_PAGE_TYPE; i++)
 		kvfree(sbi->write_io[i]);
 #ifdef CONFIG_UNICODE
-	utf8_unload(sbi->s_encoding);
+	utf8_unload(sb->s_encoding);
 #endif
 	kfree(sbi);
 }
@@ -1634,13 +1654,16 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
 #ifdef CONFIG_F2FS_FS_COMPRESSION
 	f2fs_show_compress_options(seq, sbi->sb);
 #endif
+
+	if (test_opt(sbi, ATGC))
+		seq_puts(seq, ",atgc");
 	return 0;
 }
 
 static void default_options(struct f2fs_sb_info *sbi)
 {
 	/* init some FS parameters */
-	F2FS_OPTION(sbi).active_logs = NR_CURSEG_TYPE;
+	F2FS_OPTION(sbi).active_logs = NR_CURSEG_PERSIST_TYPE;
 	F2FS_OPTION(sbi).inline_xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
 	F2FS_OPTION(sbi).whint_mode = WHINT_MODE_OFF;
 	F2FS_OPTION(sbi).alloc_mode = ALLOC_MODE_DEFAULT;
@@ -1763,6 +1786,7 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
 	bool no_extent_cache = !test_opt(sbi, EXTENT_CACHE);
 	bool disable_checkpoint = test_opt(sbi, DISABLE_CHECKPOINT);
 	bool no_io_align = !F2FS_IO_ALIGNED(sbi);
+	bool no_atgc = !test_opt(sbi, ATGC);
 	bool checkpoint_changed;
 #ifdef CONFIG_QUOTA
 	int i, j;
@@ -1835,6 +1859,13 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
 		}
 	}
 #endif
+	/* disallow enable atgc dynamically */
+	if (no_atgc == !!test_opt(sbi, ATGC)) {
+		err = -EINVAL;
+		f2fs_warn(sbi, "switch atgc option is not allowed");
+		goto restore_opts;
+	}
+
 	/* disallow enable/disable extent_cache dynamically */
 	if (no_extent_cache == !!test_opt(sbi, EXTENT_CACHE)) {
 		err = -EINVAL;
@@ -2679,10 +2710,8 @@ static inline bool sanity_check_area_boundary(struct f2fs_sb_info *sbi,
 	}
 
 	if (main_end_blkaddr > seg_end_blkaddr) {
-		f2fs_info(sbi, "Wrong MAIN_AREA boundary, start(%u) end(%u) block(%u)",
-			  main_blkaddr,
-			  segment0_blkaddr +
-			  (segment_count << log_blocks_per_seg),
+		f2fs_info(sbi, "Wrong MAIN_AREA boundary, start(%u) end(%llu) block(%u)",
+			  main_blkaddr, seg_end_blkaddr,
 			  segment_count_main << log_blocks_per_seg);
 		return true;
 	} else if (main_end_blkaddr < seg_end_blkaddr) {
@@ -2700,10 +2729,8 @@ static inline bool sanity_check_area_boundary(struct f2fs_sb_info *sbi,
 			err = __f2fs_commit_super(bh, NULL);
 			res = err ? "failed" : "done";
 		}
-		f2fs_info(sbi, "Fix alignment : %s, start(%u) end(%u) block(%u)",
-			  res, main_blkaddr,
-			  segment0_blkaddr +
-			  (segment_count << log_blocks_per_seg),
+		f2fs_info(sbi, "Fix alignment : %s, start(%u) end(%llu) block(%u)",
+			  res, main_blkaddr, seg_end_blkaddr,
 			  segment_count_main << log_blocks_per_seg);
 		if (err)
 			return true;
@@ -2714,7 +2741,7 @@ static inline bool sanity_check_area_boundary(struct f2fs_sb_info *sbi,
 static int sanity_check_raw_super(struct f2fs_sb_info *sbi,
 				struct buffer_head *bh)
 {
-	block_t segment_count, segs_per_sec, secs_per_zone;
+	block_t segment_count, segs_per_sec, secs_per_zone, segment_count_main;
 	block_t total_sections, blocks_per_seg;
 	struct f2fs_super_block *raw_super = (struct f2fs_super_block *)
 					(bh->b_data + F2FS_SUPER_OFFSET);
@@ -2785,6 +2812,7 @@ static int sanity_check_raw_super(struct f2fs_sb_info *sbi,
 	}
 
 	segment_count = le32_to_cpu(raw_super->segment_count);
+	segment_count_main = le32_to_cpu(raw_super->segment_count_main);
 	segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
 	secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
 	total_sections = le32_to_cpu(raw_super->section_count);
@@ -2798,14 +2826,19 @@ static int sanity_check_raw_super(struct f2fs_sb_info *sbi,
 		return -EFSCORRUPTED;
 	}
 
-	if (total_sections > segment_count ||
-			total_sections < F2FS_MIN_SEGMENTS ||
+	if (total_sections > segment_count_main || total_sections < 1 ||
 			segs_per_sec > segment_count || !segs_per_sec) {
 		f2fs_info(sbi, "Invalid segment/section count (%u, %u x %u)",
 			  segment_count, total_sections, segs_per_sec);
 		return -EFSCORRUPTED;
 	}
 
+	if (segment_count_main != total_sections * segs_per_sec) {
+		f2fs_info(sbi, "Invalid segment/section count (%u != %u * %u)",
+			  segment_count_main, total_sections, segs_per_sec);
+		return -EFSCORRUPTED;
+	}
+
 	if ((segment_count / segs_per_sec) < total_sections) {
 		f2fs_info(sbi, "Small segment_count (%u < %u * %u)",
 			  segment_count, segs_per_sec, total_sections);
@@ -2831,6 +2864,12 @@ static int sanity_check_raw_super(struct f2fs_sb_info *sbi,
 					segment_count, dev_seg_count);
 			return -EFSCORRUPTED;
 		}
+	} else {
+		if (__F2FS_HAS_FEATURE(raw_super, F2FS_FEATURE_BLKZONED) &&
+					!bdev_is_zoned(sbi->sb->s_bdev)) {
+			f2fs_info(sbi, "Zoned block device path is missing");
+			return -EFSCORRUPTED;
+		}
 	}
 
 	if (secs_per_zone > total_sections || !secs_per_zone) {
@@ -2906,7 +2945,7 @@ int f2fs_sanity_check_ckpt(struct f2fs_sb_info *sbi)
 	ovp_segments = le32_to_cpu(ckpt->overprov_segment_count);
 	reserved_segments = le32_to_cpu(ckpt->rsvd_segment_count);
 
-	if (unlikely(fsmeta < F2FS_MIN_SEGMENTS ||
+	if (unlikely(fsmeta < F2FS_MIN_META_SEGMENTS ||
 			ovp_segments == 0 || reserved_segments == 0)) {
 		f2fs_err(sbi, "Wrong layout: check mkfs.f2fs version");
 		return 1;
@@ -2994,7 +3033,7 @@ int f2fs_sanity_check_ckpt(struct f2fs_sb_info *sbi)
 	cp_payload = __cp_payload(sbi);
 	if (cp_pack_start_sum < cp_payload + 1 ||
 		cp_pack_start_sum > blocks_per_seg - 1 -
-			NR_CURSEG_TYPE) {
+			NR_CURSEG_PERSIST_TYPE) {
 		f2fs_err(sbi, "Wrong cp_pack_start_sum: %u",
 			 cp_pack_start_sum);
 		return 1;
@@ -3087,13 +3126,26 @@ static int init_percpu_info(struct f2fs_sb_info *sbi)
 }
 
 #ifdef CONFIG_BLK_DEV_ZONED
+
+struct f2fs_report_zones_args {
+	struct f2fs_dev_info *dev;
+	bool zone_cap_mismatch;
+};
+
 static int f2fs_report_zone_cb(struct blk_zone *zone, unsigned int idx,
-			       void *data)
+			      void *data)
 {
-	struct f2fs_dev_info *dev = data;
+	struct f2fs_report_zones_args *rz_args = data;
+
+	if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
+		return 0;
+
+	set_bit(idx, rz_args->dev->blkz_seq);
+	rz_args->dev->zone_capacity_blocks[idx] = zone->capacity >>
+						F2FS_LOG_SECTORS_PER_BLOCK;
+	if (zone->len != zone->capacity && !rz_args->zone_cap_mismatch)
+		rz_args->zone_cap_mismatch = true;
 
-	if (zone->type != BLK_ZONE_TYPE_CONVENTIONAL)
-		set_bit(idx, dev->blkz_seq);
 	return 0;
 }
 
@@ -3101,6 +3153,7 @@ static int init_blkz_info(struct f2fs_sb_info *sbi, int devi)
 {
 	struct block_device *bdev = FDEV(devi).bdev;
 	sector_t nr_sectors = bdev->bd_part->nr_sects;
+	struct f2fs_report_zones_args rep_zone_arg;
 	int ret;
 
 	if (!f2fs_sb_has_blkzoned(sbi))
@@ -3126,12 +3179,26 @@ static int init_blkz_info(struct f2fs_sb_info *sbi, int devi)
 	if (!FDEV(devi).blkz_seq)
 		return -ENOMEM;
 
-	/* Get block zones type */
+	/* Get block zones type and zone-capacity */
+	FDEV(devi).zone_capacity_blocks = f2fs_kzalloc(sbi,
+					FDEV(devi).nr_blkz * sizeof(block_t),
+					GFP_KERNEL);
+	if (!FDEV(devi).zone_capacity_blocks)
+		return -ENOMEM;
+
+	rep_zone_arg.dev = &FDEV(devi);
+	rep_zone_arg.zone_cap_mismatch = false;
+
 	ret = blkdev_report_zones(bdev, 0, BLK_ALL_ZONES, f2fs_report_zone_cb,
-				  &FDEV(devi));
+				  &rep_zone_arg);
 	if (ret < 0)
 		return ret;
 
+	if (!rep_zone_arg.zone_cap_mismatch) {
+		kfree(FDEV(devi).zone_capacity_blocks);
+		FDEV(devi).zone_capacity_blocks = NULL;
+	}
+
 	return 0;
 }
 #endif
@@ -3328,7 +3395,7 @@ static int f2fs_scan_devices(struct f2fs_sb_info *sbi)
 static int f2fs_setup_casefold(struct f2fs_sb_info *sbi)
 {
 #ifdef CONFIG_UNICODE
-	if (f2fs_sb_has_casefold(sbi) && !sbi->s_encoding) {
+	if (f2fs_sb_has_casefold(sbi) && !sbi->sb->s_encoding) {
 		const struct f2fs_sb_encodings *encoding_info;
 		struct unicode_map *encoding;
 		__u16 encoding_flags;
@@ -3359,8 +3426,8 @@ static int f2fs_setup_casefold(struct f2fs_sb_info *sbi)
 			 "%s-%s with flags 0x%hx", encoding_info->name,
 			 encoding_info->version?:"\b", encoding_flags);
 
-		sbi->s_encoding = encoding;
-		sbi->s_encoding_flags = encoding_flags;
+		sbi->sb->s_encoding = encoding;
+		sbi->sb->s_encoding_flags = encoding_flags;
 		sbi->sb->s_d_op = &f2fs_dentry_ops;
 	}
 #else
@@ -3439,18 +3506,6 @@ try_onemore:
 		sbi->s_chksum_seed = f2fs_chksum(sbi, ~0, raw_super->uuid,
 						sizeof(raw_super->uuid));
 
-	/*
-	 * The BLKZONED feature indicates that the drive was formatted with
-	 * zone alignment optimization. This is optional for host-aware
-	 * devices, but mandatory for host-managed zoned block devices.
-	 */
-#ifndef CONFIG_BLK_DEV_ZONED
-	if (f2fs_sb_has_blkzoned(sbi)) {
-		f2fs_err(sbi, "Zoned block device support is not enabled");
-		err = -EOPNOTSUPP;
-		goto free_sb_buf;
-	}
-#endif
 	default_options(sbi);
 	/* parse mount options */
 	options = kstrdup((const char *)data, GFP_KERNEL);
@@ -3565,13 +3620,16 @@ try_onemore:
 	err = f2fs_init_xattr_caches(sbi);
 	if (err)
 		goto free_io_dummy;
+	err = f2fs_init_page_array_cache(sbi);
+	if (err)
+		goto free_xattr_cache;
 
 	/* get an inode for meta space */
 	sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
 	if (IS_ERR(sbi->meta_inode)) {
 		f2fs_err(sbi, "Failed to read F2FS meta data inode");
 		err = PTR_ERR(sbi->meta_inode);
-		goto free_xattr_cache;
+		goto free_page_array_cache;
 	}
 
 	err = f2fs_get_valid_checkpoint(sbi);
@@ -3761,6 +3819,8 @@ try_onemore:
 	}
 
 reset_checkpoint:
+	f2fs_init_inmem_curseg(sbi);
+
 	/* f2fs_recover_fsync_data() cleared this already */
 	clear_sbi_flag(sbi, SBI_POR_DOING);
 
@@ -3845,6 +3905,8 @@ free_meta_inode:
 	make_bad_inode(sbi->meta_inode);
 	iput(sbi->meta_inode);
 	sbi->meta_inode = NULL;
+free_page_array_cache:
+	f2fs_destroy_page_array_cache(sbi);
 free_xattr_cache:
 	f2fs_destroy_xattr_caches(sbi);
 free_io_dummy:
@@ -3856,7 +3918,7 @@ free_bio_info:
 		kvfree(sbi->write_io[i]);
 
 #ifdef CONFIG_UNICODE
-	utf8_unload(sbi->s_encoding);
+	utf8_unload(sb->s_encoding);
 #endif
 free_options:
 #ifdef CONFIG_QUOTA
@@ -3966,9 +4028,12 @@ static int __init init_f2fs_fs(void)
 	err = f2fs_create_extent_cache();
 	if (err)
 		goto free_checkpoint_caches;
-	err = f2fs_init_sysfs();
+	err = f2fs_create_garbage_collection_cache();
 	if (err)
 		goto free_extent_cache;
+	err = f2fs_init_sysfs();
+	if (err)
+		goto free_garbage_collection_cache;
 	err = register_shrinker(&f2fs_shrinker_info);
 	if (err)
 		goto free_sysfs;
@@ -3988,7 +4053,12 @@ static int __init init_f2fs_fs(void)
 	err = f2fs_init_compress_mempool();
 	if (err)
 		goto free_bioset;
+	err = f2fs_init_compress_cache();
+	if (err)
+		goto free_compress_mempool;
 	return 0;
+free_compress_mempool:
+	f2fs_destroy_compress_mempool();
 free_bioset:
 	f2fs_destroy_bioset();
 free_bio_enrty_cache:
@@ -4002,6 +4072,8 @@ free_shrinker:
 	unregister_shrinker(&f2fs_shrinker_info);
 free_sysfs:
 	f2fs_exit_sysfs();
+free_garbage_collection_cache:
+	f2fs_destroy_garbage_collection_cache();
 free_extent_cache:
 	f2fs_destroy_extent_cache();
 free_checkpoint_caches:
@@ -4018,6 +4090,7 @@ fail:
 
 static void __exit exit_f2fs_fs(void)
 {
+	f2fs_destroy_compress_cache();
 	f2fs_destroy_compress_mempool();
 	f2fs_destroy_bioset();
 	f2fs_destroy_bio_entry_cache();
@@ -4026,6 +4099,7 @@ static void __exit exit_f2fs_fs(void)
 	unregister_filesystem(&f2fs_fs_type);
 	unregister_shrinker(&f2fs_shrinker_info);
 	f2fs_exit_sysfs();
+	f2fs_destroy_garbage_collection_cache();
 	f2fs_destroy_extent_cache();
 	f2fs_destroy_checkpoint_caches();
 	f2fs_destroy_segment_manager_caches();
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index 88ed9969cc86..ec77ccfea923 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -176,12 +176,14 @@ static ssize_t encoding_show(struct f2fs_attr *a,
 		struct f2fs_sb_info *sbi, char *buf)
 {
 #ifdef CONFIG_UNICODE
+	struct super_block *sb = sbi->sb;
+
 	if (f2fs_sb_has_casefold(sbi))
 		return snprintf(buf, PAGE_SIZE, "%s (%d.%d.%d)\n",
-			sbi->s_encoding->charset,
-			(sbi->s_encoding->version >> 16) & 0xff,
-			(sbi->s_encoding->version >> 8) & 0xff,
-			sbi->s_encoding->version & 0xff);
+			sb->s_encoding->charset,
+			(sb->s_encoding->version >> 16) & 0xff,
+			(sb->s_encoding->version >> 8) & 0xff,
+			sb->s_encoding->version & 0xff);
 #endif
 	return sprintf(buf, "(none)");
 }
@@ -375,12 +377,17 @@ out:
 		return count;
 	}
 	if (!strcmp(a->attr.name, "gc_idle")) {
-		if (t == GC_IDLE_CB)
+		if (t == GC_IDLE_CB) {
 			sbi->gc_mode = GC_IDLE_CB;
-		else if (t == GC_IDLE_GREEDY)
+		} else if (t == GC_IDLE_GREEDY) {
 			sbi->gc_mode = GC_IDLE_GREEDY;
-		else
+		} else if (t == GC_IDLE_AT) {
+			if (!sbi->am.atgc_enabled)
+				return -EINVAL;
+			sbi->gc_mode = GC_AT;
+		} else {
 			sbi->gc_mode = GC_NORMAL;
+		}
 		return count;
 	}
 
@@ -968,4 +975,5 @@ void f2fs_unregister_sysfs(struct f2fs_sb_info *sbi)
 	}
 	kobject_del(&sbi->s_kobj);
 	kobject_put(&sbi->s_kobj);
+	wait_for_completion(&sbi->s_kobj_unregister);
 }
diff --git a/fs/f2fs/xattr.c b/fs/f2fs/xattr.c
index 1b0736ce0918..65afcc3cc68a 100644
--- a/fs/f2fs/xattr.c
+++ b/fs/f2fs/xattr.c
@@ -39,7 +39,7 @@ static void xattr_free(struct f2fs_sb_info *sbi, void *xattr_addr,
 	if (is_inline)
 		kmem_cache_free(sbi->inline_xattr_slab, xattr_addr);
 	else
-		kvfree(xattr_addr);
+		kfree(xattr_addr);
 }
 
 static int f2fs_xattr_generic_get(const struct xattr_handler *handler,
@@ -425,7 +425,7 @@ static int read_all_xattrs(struct inode *inode, struct page *ipage,
 	*base_addr = txattr_addr;
 	return 0;
 fail:
-	kvfree(txattr_addr);
+	kfree(txattr_addr);
 	return err;
 }
 
@@ -610,7 +610,7 @@ ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
 	}
 	error = buffer_size - rest;
 cleanup:
-	kvfree(base_addr);
+	kfree(base_addr);
 	return error;
 }
 
@@ -750,7 +750,7 @@ static int __f2fs_setxattr(struct inode *inode, int index,
 	if (!error && S_ISDIR(inode->i_mode))
 		set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_CP);
 exit:
-	kvfree(base_addr);
+	kfree(base_addr);
 	return error;
 }
 
diff --git a/fs/libfs.c b/fs/libfs.c
index e0d42e977d9a..fc34361c1489 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -20,6 +20,8 @@
 #include <linux/fs_context.h>
 #include <linux/pseudo_fs.h>
 #include <linux/fsnotify.h>
+#include <linux/unicode.h>
+#include <linux/fscrypt.h>
 
 #include <linux/uaccess.h>
 
@@ -1363,3 +1365,88 @@ bool is_empty_dir_inode(struct inode *inode)
 	return (inode->i_fop == &empty_dir_operations) &&
 		(inode->i_op == &empty_dir_inode_operations);
 }
+
+#ifdef CONFIG_UNICODE
+/*
+ * Determine if the name of a dentry should be casefolded.
+ *
+ * Return: if names will need casefolding
+ */
+static bool needs_casefold(const struct inode *dir)
+{
+	return IS_CASEFOLDED(dir) && dir->i_sb->s_encoding;
+}
+
+/**
+ * generic_ci_d_compare - generic d_compare implementation for casefolding filesystems
+ * @dentry:	dentry whose name we are checking against
+ * @len:	len of name of dentry
+ * @str:	str pointer to name of dentry
+ * @name:	Name to compare against
+ *
+ * Return: 0 if names match, 1 if mismatch, or -ERRNO
+ */
+int generic_ci_d_compare(const struct dentry *dentry, unsigned int len,
+			  const char *str, const struct qstr *name)
+{
+	const struct dentry *parent = READ_ONCE(dentry->d_parent);
+	const struct inode *dir = READ_ONCE(parent->d_inode);
+	const struct super_block *sb = dentry->d_sb;
+	const struct unicode_map *um = sb->s_encoding;
+	struct qstr qstr = QSTR_INIT(str, len);
+	char strbuf[DNAME_INLINE_LEN];
+	int ret;
+
+	if (!dir || !needs_casefold(dir))
+		goto fallback;
+	/*
+	 * If the dentry name is stored in-line, then it may be concurrently
+	 * modified by a rename.  If this happens, the VFS will eventually retry
+	 * the lookup, so it doesn't matter what ->d_compare() returns.
+	 * However, it's unsafe to call utf8_strncasecmp() with an unstable
+	 * string.  Therefore, we have to copy the name into a temporary buffer.
+	 */
+	if (len <= DNAME_INLINE_LEN - 1) {
+		memcpy(strbuf, str, len);
+		strbuf[len] = 0;
+		qstr.name = strbuf;
+		/* prevent compiler from optimizing out the temporary buffer */
+		barrier();
+	}
+	ret = utf8_strncasecmp(um, name, &qstr);
+	if (ret >= 0)
+		return ret;
+
+	if (sb_has_strict_encoding(sb))
+		return -EINVAL;
+fallback:
+	if (len != name->len)
+		return 1;
+	return !!memcmp(str, name->name, len);
+}
+EXPORT_SYMBOL(generic_ci_d_compare);
+
+/**
+ * generic_ci_d_hash - generic d_hash implementation for casefolding filesystems
+ * @dentry:	dentry of the parent directory
+ * @str:	qstr of name whose hash we should fill in
+ *
+ * Return: 0 if hash was successful or unchanged, and -EINVAL on error
+ */
+int generic_ci_d_hash(const struct dentry *dentry, struct qstr *str)
+{
+	const struct inode *dir = READ_ONCE(dentry->d_inode);
+	struct super_block *sb = dentry->d_sb;
+	const struct unicode_map *um = sb->s_encoding;
+	int ret = 0;
+
+	if (!dir || !needs_casefold(dir))
+		return 0;
+
+	ret = utf8_casefold_hash(um, dentry, str);
+	if (ret < 0 && sb_has_strict_encoding(sb))
+		return -EINVAL;
+	return 0;
+}
+EXPORT_SYMBOL(generic_ci_d_hash);
+#endif
diff --git a/fs/unicode/utf8-core.c b/fs/unicode/utf8-core.c
index 2a878b739115..dc25823bfed9 100644
--- a/fs/unicode/utf8-core.c
+++ b/fs/unicode/utf8-core.c
@@ -6,6 +6,7 @@
 #include <linux/parser.h>
 #include <linux/errno.h>
 #include <linux/unicode.h>
+#include <linux/stringhash.h>
 
 #include "utf8n.h"
 
@@ -122,9 +123,29 @@ int utf8_casefold(const struct unicode_map *um, const struct qstr *str,
 	}
 	return -EINVAL;
 }
-
 EXPORT_SYMBOL(utf8_casefold);
 
+int utf8_casefold_hash(const struct unicode_map *um, const void *salt,
+		       struct qstr *str)
+{
+	const struct utf8data *data = utf8nfdicf(um->version);
+	struct utf8cursor cur;
+	int c;
+	unsigned long hash = init_name_hash(salt);
+
+	if (utf8ncursor(&cur, data, str->name, str->len) < 0)
+		return -EINVAL;
+
+	while ((c = utf8byte(&cur))) {
+		if (c < 0)
+			return -EINVAL;
+		hash = partial_name_hash((unsigned char)c, hash);
+	}
+	str->hash = end_name_hash(hash);
+	return 0;
+}
+EXPORT_SYMBOL(utf8_casefold_hash);
+
 int utf8_normalize(const struct unicode_map *um, const struct qstr *str,
 		   unsigned char *dest, size_t dlen)
 {