diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
index 7f730c4..834d0be 100644
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -22,7 +22,8 @@
 Description:	Controls the victim selection policy for garbage collection.
 		Setting gc_idle = 0(default) will disable this option. Setting
 		gc_idle = 1 will select the Cost Benefit approach & setting
-		gc_idle = 2 will select the greedy approach.
+		gc_idle = 2 will select the greedy approach & setting
+		gc_idle = 3 will select the age-threshold based approach.
 
 What:		/sys/fs/f2fs/<disk>/reclaim_segments
 Date:		October 2013
diff --git a/Documentation/filesystems/f2fs.rst b/Documentation/filesystems/f2fs.rst
index ec8d997..b8ee761 100644
--- a/Documentation/filesystems/f2fs.rst
+++ b/Documentation/filesystems/f2fs.rst
@@ -127,14 +127,14 @@
 			 current design, f2fs supports only 2, 4, and 6 logs.
 			 Default number is 6.
 disable_ext_identify	 Disable the extension list configured by mkfs, so f2fs
-			 does not aware of cold files such as media files.
+			 is not aware of cold files such as media files.
 inline_xattr		 Enable the inline xattrs feature.
 noinline_xattr		 Disable the inline xattrs feature.
 inline_xattr_size=%u	 Support configuring inline xattr size, it depends on
 			 flexible inline xattr feature.
-inline_data		 Enable the inline data feature: New created small(<~3.4k)
+inline_data		 Enable the inline data feature: Newly created small (<~3.4k)
 			 files can be written into inode block.
-inline_dentry		 Enable the inline dir feature: data in new created
+inline_dentry		 Enable the inline dir feature: data in newly created
 			 directory entries can be written into inode block. The
 			 space of inode block which is used to store inline
 			 dentries is limited to ~3.4k.
@@ -203,9 +203,9 @@
 grpjquota=<file>	 information can be properly updated during recovery flow,
 prjjquota=<file>	 <quota file>: must be in root directory;
 jqfmt=<quota type>	 <quota type>: [vfsold,vfsv0,vfsv1].
-offusrjquota		 Turn off user journelled quota.
-offgrpjquota		 Turn off group journelled quota.
-offprjjquota		 Turn off project journelled quota.
+offusrjquota		 Turn off user journalled quota.
+offgrpjquota		 Turn off group journalled quota.
+offprjjquota		 Turn off project journalled quota.
 quota			 Enable plain user disk quota accounting.
 noquota			 Disable all plain disk quota option.
 whint_mode=%s		 Control which write hints are passed down to block
@@ -266,6 +266,8 @@
 			 inline encryption hardware. The on-disk format is
 			 unaffected. For more details, see
 			 Documentation/block/inline-encryption.rst.
+atgc			 Enable age-threshold garbage collection, it provides high
+			 effectiveness and efficiency on background GC.
 ======================== ============================================================
 
 Debugfs Entries
@@ -301,7 +303,7 @@
 
 	# insmod f2fs.ko
 
-3. Create a directory trying to mount::
+3. Create a directory to use when mounting::
 
 	# mkdir /mnt/f2fs
 
@@ -315,7 +317,7 @@
 The mkfs.f2fs is for the use of formatting a partition as the f2fs filesystem,
 which builds a basic on-disk layout.
 
-The options consist of:
+The quick options consist of:
 
 ===============    ===========================================================
 ``-l [label]``     Give a volume label, up to 512 unicode name.
@@ -337,6 +339,8 @@
                    1 is set by default, which conducts discard.
 ===============    ===========================================================
 
+Note: please refer to the manpage of mkfs.f2fs(8) to get full option list.
+
 fsck.f2fs
 ---------
 The fsck.f2fs is a tool to check the consistency of an f2fs-formatted
@@ -344,10 +348,12 @@
 are cross-referenced correctly or not.
 Note that, initial version of the tool does not fix any inconsistency.
 
-The options consist of::
+The quick options consist of::
 
   -d debug level [default:0]
 
+Note: please refer to the manpage of fsck.f2fs(8) to get full option list.
+
 dump.f2fs
 ---------
 The dump.f2fs shows the information of specific inode and dumps SSA and SIT to
@@ -371,6 +377,37 @@
     # dump.f2fs -s 0~-1 /dev/sdx (SIT dump)
     # dump.f2fs -a 0~-1 /dev/sdx (SSA dump)
 
+Note: please refer to the manpage of dump.f2fs(8) to get full option list.
+
+sload.f2fs
+----------
+The sload.f2fs gives a way to insert files and directories in the exisiting disk
+image. This tool is useful when building f2fs images given compiled files.
+
+Note: please refer to the manpage of sload.f2fs(8) to get full option list.
+
+resize.f2fs
+-----------
+The resize.f2fs lets a user resize the f2fs-formatted disk image, while preserving
+all the files and directories stored in the image.
+
+Note: please refer to the manpage of resize.f2fs(8) to get full option list.
+
+defrag.f2fs
+-----------
+The defrag.f2fs can be used to defragment scattered written data as well as
+filesystem metadata across the disk. This can improve the write speed by giving
+more free consecutive space.
+
+Note: please refer to the manpage of defrag.f2fs(8) to get full option list.
+
+f2fs_io
+-------
+The f2fs_io is a simple tool to issue various filesystem APIs as well as
+f2fs-specific ones, which is very useful for QA tests.
+
+Note: please refer to the manpage of f2fs_io(8) to get full option list.
+
 Design
 ======
 
@@ -383,7 +420,7 @@
 segment size identically, but users can easily modify the sizes by mkfs.
 
 F2FS splits the entire volume into six areas, and all the areas except superblock
-consists of multiple segments as described below::
+consist of multiple segments as described below::
 
                                             align with the zone size <-|
                  |-> align with the segment size
@@ -486,7 +523,7 @@
 			              `- direct node (1018)
 	                                         `- data (1018)
 
-Note that, all the node blocks are mapped by NAT which means the location of
+Note that all the node blocks are mapped by NAT which means the location of
 each node is translated by the NAT table. In the consideration of the wandering
 tree problem, F2FS is able to cut off the propagation of node updates caused by
 leaf data writes.
@@ -566,7 +603,7 @@
 name is calculated. Then, F2FS scans the hash table in level #0 to find the
 dentry consisting of the file name and its inode number. If not found, F2FS
 scans the next hash table in level #1. In this way, F2FS scans hash tables in
-each levels incrementally from 1 to N. In each levels F2FS needs to scan only
+each levels incrementally from 1 to N. In each level F2FS needs to scan only
 one bucket determined by the following equation, which shows O(log(# of files))
 complexity::
 
@@ -707,7 +744,7 @@
 Fallocate(2) Policy
 -------------------
 
-The default policy follows the below posix rule.
+The default policy follows the below POSIX rule.
 
 Allocating disk space
     The default operation (i.e., mode is zero) of fallocate() allocates
@@ -720,7 +757,7 @@
     as a method of optimally implementing that function.
 
 However, once F2FS receives ioctl(fd, F2FS_IOC_SET_PIN_FILE) in prior to
-fallocate(fd, DEFAULT_MODE), it allocates on-disk blocks addressess having
+fallocate(fd, DEFAULT_MODE), it allocates on-disk block addressess having
 zero or random data, which is useful to the below scenario where:
 
  1. create(fd)
@@ -739,7 +776,7 @@
   cluster can be compressed or not.
 
 - In cluster metadata layout, one special block address is used to indicate
-  cluster is compressed one or normal one, for compressed cluster, following
+  a cluster is a compressed one or normal one; for compressed cluster, following
   metadata maps cluster to [1, 4 << n - 1] physical blocks, in where f2fs
   stores data including compress header and compressed data.
 
@@ -772,3 +809,18 @@
 	+-------------+-------------+----------+----------------------------+
 	| data length | data chksum | reserved |      compressed data       |
 	+-------------+-------------+----------+----------------------------+
+
+NVMe Zoned Namespace devices
+----------------------------
+
+- ZNS defines a per-zone capacity which can be equal or less than the
+  zone-size. Zone-capacity is the number of usable blocks in the zone.
+  F2FS checks if zone-capacity is less than zone-size, if it is, then any
+  segment which starts after the zone-capacity is marked as not-free in
+  the free segment bitmap at initial mount time. These segments are marked
+  as permanently used so they are not allocated for writes and
+  consequently are not needed to be garbage collected. In case the
+  zone-capacity is not aligned to default segment size(2MB), then a segment
+  can start before the zone-capacity and span across zone-capacity boundary.
+  Such spanning segments are also considered as usable segments. All blocks
+  past the zone-capacity are considered unusable in these segments.
diff --git a/fs/f2fs/acl.c b/fs/f2fs/acl.c
index 217b290..3064135 100644
--- a/fs/f2fs/acl.c
+++ b/fs/f2fs/acl.c
@@ -160,7 +160,7 @@
 	return (void *)f2fs_acl;
 
 fail:
-	kvfree(f2fs_acl);
+	kfree(f2fs_acl);
 	return ERR_PTR(-EINVAL);
 }
 
@@ -190,7 +190,7 @@
 		acl = NULL;
 	else
 		acl = ERR_PTR(retval);
-	kvfree(value);
+	kfree(value);
 
 	return acl;
 }
@@ -240,7 +240,7 @@
 
 	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 ff807e1..023462e 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -107,7 +107,7 @@
 	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 @@
 					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 @@
 				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 @@
 
 	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 @@
 	}
 
 	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 1dfb126..14262e0 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 @@
 
 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 @@
 	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 @@
 	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 @@
 	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 @@
 		}
 	}
 
-	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 @@
 	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 @@
 	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 @@
 	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 @@
 		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 @@
 			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 @@
 	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 @@
 
 {
 	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 @@
 		 */
 		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 @@
 
 	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 @@
 	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 @@
 		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 @@
 		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 @@
 
 	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 @@
 		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 @@
 					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 @@
 
 		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 @@
 
 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 @@
 		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 @@
 				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 @@
 				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_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 73683e5..be4da52 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -202,7 +202,7 @@
 		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 @@
 
 			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 @@
 	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_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 @@
 			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 @@
 			retry = 0;
 		}
 	}
+	if (f2fs_compressed_file(inode))
+		f2fs_destroy_compress_ctx(&cc);
 #endif
 	if (retry) {
 		index = 0;
@@ -3574,7 +3572,7 @@
 	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 @@
 									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 @@
 	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 @@
 #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 @@
 	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 @@
 	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 4276c0f..a8357fd 100644
--- a/fs/f2fs/debug.c
+++ b/fs/f2fs/debug.c
@@ -131,7 +131,7 @@
 	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 @@
 		* 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 @@
 			   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 @@
 			   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 @@
 	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 @@
 	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 53fbc4d..4b9ef8b 100644
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -75,21 +75,22 @@
 			      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 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 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 @@
 		 * 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 @@
 			}
 		}
 
-		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 @@
 	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 @@
 	}
 
 	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 @@
 };
 
 #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 686c68b..3ebf976 100644
--- a/fs/f2fs/extent_cache.c
+++ b/fs/f2fs/extent_cache.c
@@ -58,6 +58,29 @@
 	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 @@
 }
 
 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 @@
 		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 7c089ff..cb700d7 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -98,6 +98,7 @@
 #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 @@
 
 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 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 @@
  */
 #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 @@
 	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 @@
 #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 @@
 	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 @@
 	GC_NORMAL,
 	GC_IDLE_CB,
 	GC_IDLE_GREEDY,
+	GC_IDLE_AT,
 	GC_URGENT_HIGH,
 	GC_URGENT_LOW,
 };
@@ -1303,9 +1328,9 @@
 #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 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 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 @@
 #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 @@
 	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 @@
 						 * 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 @@
 	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 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 @@
 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 @@
 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 @@
 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 @@
 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 @@
 			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 @@
 	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 @@
 			(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 @@
  */
 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_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 @@
 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 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 @@
 	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 @@
 						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 8a42240..ee861c6 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -376,32 +376,15 @@
 	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 @@
 	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 @@
 		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 @@
 				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 @@
 	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 @@
 		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 @@
 		}
 
 		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 @@
 
 	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 @@
 		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 @@
 	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 @@
 	if (ret)
 		goto out;
 
-	if (f2fs_disable_compressed_file(inode)) {
+	if (!f2fs_disable_compressed_file(inode)) {
 		ret = -EOPNOTSUPP;
 		goto out;
 	}
@@ -3385,7 +3374,7 @@
 				min(FSLABEL_MAX, count)))
 		err = -EFAULT;
 
-	kvfree(vbuf);
+	kfree(vbuf);
 	return err;
 }
 
@@ -3436,7 +3425,7 @@
 	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 @@
 	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 @@
 	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 @@
 
 	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 @@
 	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 @@
 
 	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 11b4add..05641a1 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 @@
 			"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 @@
 	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 @@
 	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 @@
 		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 @@
 	 */
 	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 @@
 	/* 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 @@
 	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 @@
 	/* 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 @@
 	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 @@
  * 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 @@
 		/* 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 @@
 			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 @@
 	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 @@
 	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 @@
 	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 @@
 	}
 
 	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 @@
 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 @@
 	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 @@
 
 	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 @@
 	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 @@
 		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 @@
 	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 @@
 	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 @@
 	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 db3c610..0c8dae1 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 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 102df44..70384e3 100644
--- a/fs/f2fs/inline.c
+++ b/fs/f2fs/inline.c
@@ -524,7 +524,7 @@
 			!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 @@
 	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 66969ae8..657db2f 100644
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -287,11 +287,19 @@
 		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 @@
 		}
 		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 @@
 		}
 		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 @@
 					(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 @@
 	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 @@
 			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 @@
 	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 45f3245..8fa37d1 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -712,7 +712,7 @@
 	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 cb1b5b6..d5d8ce0 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -109,7 +109,7 @@
 
 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 @@
 	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 @@
 	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 e247a5e..1596502 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -189,7 +189,7 @@
 
 	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 @@
 				"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 @@
 		kthread_stop(flush_thread);
 	}
 	if (free) {
-		kvfree(fcc);
+		kfree(fcc);
 		SM_I(sbi)->fcc_info = NULL;
 	}
 }
@@ -759,6 +759,9 @@
 	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 @@
 {
 	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 @@
 	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 @@
 			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 @@
 
 	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 @@
 				"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 @@
 	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 @@
 		__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 @@
 	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 @@
 	/* 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 @@
  */
 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 @@
 	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 @@
 {
 	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 @@
 
 	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 @@
 	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 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 @@
  * 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 @@
 	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 @@
 	__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 @@
 		}
 		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 @@
 	}
 
 	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 @@
 	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 @@
 	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 @@
 	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 @@
 	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 @@
 	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 @@
 	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 @@
 {
 	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 @@
 
 	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 @@
 	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 @@
 	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 @@
 
 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 @@
 	/* 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 @@
 	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 @@
 	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 @@
 		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 @@
 	}
 
 	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 @@
 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 @@
 	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 @@
 				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 @@
 {
 	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 @@
 	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 @@
 			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 @@
 	 * 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 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 @@
 
 	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 @@
 {
 	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 @@
 			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 @@
 
 	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 @@
 		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 @@
 	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 @@
 
 	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 @@
 	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 @@
 	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 752b177..e81eb07 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 @@
  * 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 @@
 	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 @@
 	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 @@
 /* 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 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 @@
  */
 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 @@
 	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 @@
 
 	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_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 @@
 	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 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 @@
 	/* 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 @@
 
 	/* 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 @@
 	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 @@
 		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 bef2be3..0c958fe 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -146,6 +146,7 @@
 	Opt_compress_algorithm,
 	Opt_compress_log_size,
 	Opt_compress_extension,
+	Opt_atgc,
 	Opt_err,
 };
 
@@ -213,6 +214,7 @@
 	{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 @@
 		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 @@
 #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 @@
 			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 @@
 			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 @@
 			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 @@
 		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 @@
 	}
 
 	/* 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 @@
 
 	/* 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 @@
 		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 @@
 	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 @@
 	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 @@
 #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 @@
 	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 @@
 		}
 	}
 #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 @@
 	}
 
 	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 @@
 			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 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 @@
 	}
 
 	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 @@
 		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 @@
 					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 @@
 	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 @@
 	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 @@
 }
 
 #ifdef CONFIG_BLK_DEV_ZONED
-static int f2fs_report_zone_cb(struct blk_zone *zone, unsigned int idx,
-			       void *data)
-{
-	struct f2fs_dev_info *dev = data;
 
-	if (zone->type != BLK_ZONE_TYPE_CONVENTIONAL)
-		set_bit(idx, dev->blkz_seq);
+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)
+{
+	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;
+
 	return 0;
 }
 
@@ -3101,6 +3153,7 @@
 {
 	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 @@
 	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_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 @@
 			 "%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 @@
 		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 @@
 	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 @@
 	}
 
 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 @@
 	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 @@
 		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 @@
 	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 @@
 	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 @@
 	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 @@
 
 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 @@
 	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 88ed996..ec77ccf 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -176,12 +176,14 @@
 		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 @@
 		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 @@
 	}
 	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 1b0736c..65afcc3 100644
--- a/fs/f2fs/xattr.c
+++ b/fs/f2fs/xattr.c
@@ -39,7 +39,7 @@
 	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 @@
 	*base_addr = txattr_addr;
 	return 0;
 fail:
-	kvfree(txattr_addr);
+	kfree(txattr_addr);
 	return err;
 }
 
@@ -610,7 +610,7 @@
 	}
 	error = buffer_size - rest;
 cleanup:
-	kvfree(base_addr);
+	kfree(base_addr);
 	return error;
 }
 
@@ -750,7 +750,7 @@
 	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 e0d42e9..fc34361 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 @@
 	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 2a878b7..dc25823 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 @@
 	}
 	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)
 {
diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
index 3c383dd..a5dbb57 100644
--- a/include/linux/f2fs_fs.h
+++ b/include/linux/f2fs_fs.h
@@ -38,9 +38,6 @@
 #define F2FS_MAX_QUOTAS		3
 
 #define F2FS_ENC_UTF8_12_1	1
-#define F2FS_ENC_STRICT_MODE_FL	(1 << 0)
-#define f2fs_has_strict_mode(sbi) \
-	(sbi->s_encoding_flags & F2FS_ENC_STRICT_MODE_FL)
 
 #define F2FS_IO_SIZE(sbi)	(1 << F2FS_OPTION(sbi).write_io_size_bits) /* Blocks */
 #define F2FS_IO_SIZE_KB(sbi)	(1 << (F2FS_OPTION(sbi).write_io_size_bits + 2)) /* KB */
diff --git a/include/linux/fs.h b/include/linux/fs.h
index d1d166b..c4ae9caf 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1366,6 +1366,12 @@
 #define SB_ACTIVE	(1<<30)
 #define SB_NOUSER	(1<<31)
 
+/* These flags relate to encoding and casefolding */
+#define SB_ENC_STRICT_MODE_FL	(1 << 0)
+
+#define sb_has_strict_encoding(sb) \
+	(sb->s_encoding_flags & SB_ENC_STRICT_MODE_FL)
+
 /*
  *	Umount options
  */
@@ -1436,6 +1442,10 @@
 #ifdef CONFIG_FS_VERITY
 	const struct fsverity_operations *s_vop;
 #endif
+#ifdef CONFIG_UNICODE
+	struct unicode_map *s_encoding;
+	__u16 s_encoding_flags;
+#endif
 	struct hlist_bl_head	s_roots;	/* alternate root dentries for NFS */
 	struct list_head	s_mounts;	/* list of mounts; _not_ for fs use */
 	struct block_device	*s_bdev;
@@ -3189,6 +3199,12 @@
 
 extern int generic_check_addressable(unsigned, u64);
 
+#ifdef CONFIG_UNICODE
+extern int generic_ci_d_hash(const struct dentry *dentry, struct qstr *str);
+extern int generic_ci_d_compare(const struct dentry *dentry, unsigned int len,
+				const char *str, const struct qstr *name);
+#endif
+
 #ifdef CONFIG_MIGRATION
 extern int buffer_migrate_page(struct address_space *,
 				struct page *, struct page *,
diff --git a/include/linux/unicode.h b/include/linux/unicode.h
index 990aa97..74484d4 100644
--- a/include/linux/unicode.h
+++ b/include/linux/unicode.h
@@ -27,6 +27,9 @@
 int utf8_casefold(const struct unicode_map *um, const struct qstr *str,
 		  unsigned char *dest, size_t dlen);
 
+int utf8_casefold_hash(const struct unicode_map *um, const void *salt,
+		       struct qstr *str);
+
 struct unicode_map *utf8_load(const char *version);
 void utf8_unload(struct unicode_map *um);
 
diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
index 8a1c131..f8f1e85 100644
--- a/include/trace/events/f2fs.h
+++ b/include/trace/events/f2fs.h
@@ -111,13 +111,15 @@
 
 #define show_alloc_mode(type)						\
 	__print_symbolic(type,						\
-		{ LFS,	"LFS-mode" },					\
-		{ SSR,	"SSR-mode" })
+		{ LFS,		"LFS-mode" },				\
+		{ SSR,		"SSR-mode" },				\
+		{ AT_SSR,	"AT_SSR-mode" })
 
 #define show_victim_policy(type)					\
 	__print_symbolic(type,						\
 		{ GC_GREEDY,	"Greedy" },				\
-		{ GC_CB,	"Cost-Benefit" })
+		{ GC_CB,	"Cost-Benefit" },			\
+		{ GC_AT,	"Age-threshold" })
 
 #define show_cpreason(type)						\
 	__print_flags(type, "|",					\
@@ -134,7 +136,7 @@
 	__print_symbolic(type,						\
 		{ CP_NO_NEEDED,		"no needed" },			\
 		{ CP_NON_REGULAR,	"non regular" },		\
-		{ CP_COMPRESSED,	"compreesed" },			\
+		{ CP_COMPRESSED,	"compressed" },			\
 		{ CP_HARDLINK,		"hardlink" },			\
 		{ CP_SB_NEED_CP,	"sb needs cp" },		\
 		{ CP_WRONG_PINO,	"wrong pino" },			\