diff --git a/fs/exfat/dir.c b/fs/exfat/dir.c
index 1dfa67f307f1..957574180a5e 100644
--- a/fs/exfat/dir.c
+++ b/fs/exfat/dir.c
@@ -29,14 +29,15 @@ static int exfat_extract_uni_name(struct exfat_dentry *ep,
 
 }
 
-static void exfat_get_uniname_from_ext_entry(struct super_block *sb,
+static int exfat_get_uniname_from_ext_entry(struct super_block *sb,
 		struct exfat_chain *p_dir, int entry, unsigned short *uniname)
 {
-	int i;
+	int i, err;
 	struct exfat_entry_set_cache es;
 
-	if (exfat_get_dentry_set(&es, sb, p_dir, entry, ES_ALL_ENTRIES))
-		return;
+	err = exfat_get_dentry_set(&es, sb, p_dir, entry, ES_ALL_ENTRIES);
+	if (err)
+		return err;
 
 	/*
 	 * First entry  : file entry
@@ -56,12 +57,13 @@ static void exfat_get_uniname_from_ext_entry(struct super_block *sb,
 	}
 
 	exfat_put_dentry_set(&es, false);
+	return 0;
 }
 
 /* read a directory entry from the opened directory */
 static int exfat_readdir(struct inode *inode, loff_t *cpos, struct exfat_dir_entry *dir_entry)
 {
-	int i, dentries_per_clu, num_ext;
+	int i, dentries_per_clu, num_ext, err;
 	unsigned int type, clu_offset, max_dentries;
 	struct exfat_chain dir, clu;
 	struct exfat_uni_name uni_name;
@@ -100,7 +102,7 @@ static int exfat_readdir(struct inode *inode, loff_t *cpos, struct exfat_dir_ent
 			clu.dir = ei->hint_bmap.clu;
 		}
 
-		while (clu_offset > 0) {
+		while (clu_offset > 0 && clu.dir != EXFAT_EOF_CLUSTER) {
 			if (exfat_get_next_cluster(sb, &(clu.dir)))
 				return -EIO;
 
@@ -146,8 +148,12 @@ static int exfat_readdir(struct inode *inode, loff_t *cpos, struct exfat_dir_ent
 					0);
 
 			*uni_name.name = 0x0;
-			exfat_get_uniname_from_ext_entry(sb, &clu, i,
+			err = exfat_get_uniname_from_ext_entry(sb, &clu, i,
 				uni_name.name);
+			if (err) {
+				brelse(bh);
+				continue;
+			}
 			exfat_utf16_to_nls(sb, &uni_name,
 				dir_entry->namebuf.lfn,
 				dir_entry->namebuf.lfnbuf_len);
@@ -234,10 +240,7 @@ static int exfat_iterate(struct file *file, struct dir_context *ctx)
 		fake_offset = 1;
 	}
 
-	if (cpos & (DENTRY_SIZE - 1)) {
-		err = -ENOENT;
-		goto unlock;
-	}
+	cpos = round_up(cpos, DENTRY_SIZE);
 
 	/* name buffer should be allocated before use */
 	err = exfat_alloc_namebuf(nb);
@@ -378,6 +381,12 @@ unsigned int exfat_get_entry_type(struct exfat_dentry *ep)
 			return TYPE_ACL;
 		return TYPE_CRITICAL_SEC;
 	}
+
+	if (ep->type == EXFAT_VENDOR_EXT)
+		return TYPE_VENDOR_EXT;
+	if (ep->type == EXFAT_VENDOR_ALLOC)
+		return TYPE_VENDOR_ALLOC;
+
 	return TYPE_BENIGN_SEC;
 }
 
@@ -521,6 +530,25 @@ int exfat_update_dir_chksum(struct inode *inode, struct exfat_chain *p_dir,
 	return ret;
 }
 
+static void exfat_free_benign_secondary_clusters(struct inode *inode,
+		struct exfat_dentry *ep)
+{
+	struct super_block *sb = inode->i_sb;
+	struct exfat_chain dir;
+	unsigned int start_clu =
+		le32_to_cpu(ep->dentry.generic_secondary.start_clu);
+	u64 size = le64_to_cpu(ep->dentry.generic_secondary.size);
+	unsigned char flags = ep->dentry.generic_secondary.flags;
+
+	if (!(flags & ALLOC_POSSIBLE) || !start_clu || !size)
+		return;
+
+	exfat_chain_set(&dir, start_clu,
+			EXFAT_B_TO_CLU_ROUND_UP(size, EXFAT_SB(sb)),
+			flags);
+	exfat_free_cluster(inode, &dir);
+}
+
 int exfat_init_ext_entry(struct inode *inode, struct exfat_chain *p_dir,
 		int entry, int num_entries, struct exfat_uni_name *p_uniname)
 {
@@ -553,6 +581,9 @@ int exfat_init_ext_entry(struct inode *inode, struct exfat_chain *p_dir,
 		if (!ep)
 			return -EIO;
 
+		if (exfat_get_entry_type(ep) & TYPE_BENIGN_SEC)
+			exfat_free_benign_secondary_clusters(inode, ep);
+
 		exfat_init_name_entry(ep, uniname);
 		exfat_update_bh(bh, sync);
 		brelse(bh);
@@ -576,6 +607,9 @@ int exfat_remove_entries(struct inode *inode, struct exfat_chain *p_dir,
 		if (!ep)
 			return -EIO;
 
+		if (exfat_get_entry_type(ep) & TYPE_BENIGN_SEC)
+			exfat_free_benign_secondary_clusters(inode, ep);
+
 		exfat_set_entry_type(ep, TYPE_DELETED);
 		exfat_update_bh(bh, IS_DIRSYNC(inode));
 		brelse(bh);
@@ -744,6 +778,7 @@ enum exfat_validate_dentry_mode {
 	ES_MODE_GET_STRM_ENTRY,
 	ES_MODE_GET_NAME_ENTRY,
 	ES_MODE_GET_CRITICAL_SEC_ENTRY,
+	ES_MODE_GET_BENIGN_SEC_ENTRY,
 };
 
 static bool exfat_validate_entry(unsigned int type,
@@ -757,36 +792,33 @@ static bool exfat_validate_entry(unsigned int type,
 		if  (type != TYPE_FILE && type != TYPE_DIR)
 			return false;
 		*mode = ES_MODE_GET_FILE_ENTRY;
-		return true;
+		break;
 	case ES_MODE_GET_FILE_ENTRY:
 		if (type != TYPE_STREAM)
 			return false;
 		*mode = ES_MODE_GET_STRM_ENTRY;
-		return true;
+		break;
 	case ES_MODE_GET_STRM_ENTRY:
 		if (type != TYPE_EXTEND)
 			return false;
 		*mode = ES_MODE_GET_NAME_ENTRY;
-		return true;
+		break;
 	case ES_MODE_GET_NAME_ENTRY:
-		if (type == TYPE_STREAM)
+		if (type & TYPE_BENIGN_SEC)
+			*mode = ES_MODE_GET_BENIGN_SEC_ENTRY;
+		else if (type != TYPE_EXTEND)
 			return false;
-		if (type != TYPE_EXTEND) {
-			if (!(type & TYPE_CRITICAL_SEC))
-				return false;
-			*mode = ES_MODE_GET_CRITICAL_SEC_ENTRY;
-		}
-		return true;
-	case ES_MODE_GET_CRITICAL_SEC_ENTRY:
-		if (type == TYPE_EXTEND || type == TYPE_STREAM)
+		break;
+	case ES_MODE_GET_BENIGN_SEC_ENTRY:
+		/* Assume unreconized benign secondary entry */
+		if (!(type & TYPE_BENIGN_SEC))
 			return false;
-		if ((type & TYPE_CRITICAL_SEC) != TYPE_CRITICAL_SEC)
-			return false;
-		return true;
+		break;
 	default:
-		WARN_ON_ONCE(1);
 		return false;
 	}
+
+	return true;
 }
 
 struct exfat_dentry *exfat_get_dentry_cached(
@@ -1167,10 +1199,8 @@ int exfat_count_ext_entries(struct super_block *sb, struct exfat_chain *p_dir,
 
 		type = exfat_get_entry_type(ext_ep);
 		brelse(bh);
-		if (type == TYPE_EXTEND || type == TYPE_STREAM)
+		if (type & TYPE_CRITICAL_SEC || type & TYPE_BENIGN_SEC)
 			count++;
-		else
-			break;
 	}
 	return count;
 }
diff --git a/fs/exfat/exfat_fs.h b/fs/exfat/exfat_fs.h
index 1bf16abe3c84..729ada9e26e8 100644
--- a/fs/exfat/exfat_fs.h
+++ b/fs/exfat/exfat_fs.h
@@ -50,7 +50,7 @@ enum {
 #define ES_IDX_LAST_FILENAME(name_len)	\
 	(ES_IDX_FIRST_FILENAME + EXFAT_FILENAME_ENTRY_NUM(name_len) - 1)
 
-#define DIR_DELETED		0xFFFF0321
+#define DIR_DELETED		0xFFFFFFF7
 
 /* type values */
 #define TYPE_UNUSED		0x0000
@@ -71,6 +71,8 @@ enum {
 #define TYPE_PADDING		0x0402
 #define TYPE_ACLTAB		0x0403
 #define TYPE_BENIGN_SEC		0x0800
+#define TYPE_VENDOR_EXT		0x0801
+#define TYPE_VENDOR_ALLOC	0x0802
 
 #define MAX_CHARSET_SIZE	6 /* max size of multi-byte character */
 #define MAX_NAME_LENGTH		255 /* max len of file name excluding NULL */
diff --git a/fs/exfat/exfat_raw.h b/fs/exfat/exfat_raw.h
index 7f39b1c6469c..0ece2e43cf49 100644
--- a/fs/exfat/exfat_raw.h
+++ b/fs/exfat/exfat_raw.h
@@ -27,6 +27,7 @@
 	((sbi)->num_clusters - EXFAT_RESERVED_CLUSTERS)
 
 /* AllocationPossible and NoFatChain field in GeneralSecondaryFlags Field */
+#define ALLOC_POSSIBLE		0x01
 #define ALLOC_FAT_CHAIN		0x01
 #define ALLOC_NO_FAT_CHAIN	0x03
 
@@ -50,6 +51,8 @@
 #define EXFAT_STREAM		0xC0	/* stream entry */
 #define EXFAT_NAME		0xC1	/* file name entry */
 #define EXFAT_ACL		0xC2	/* stream entry */
+#define EXFAT_VENDOR_EXT	0xE0	/* vendor extension entry */
+#define EXFAT_VENDOR_ALLOC	0xE1	/* vendor allocation entry */
 
 #define IS_EXFAT_CRITICAL_PRI(x)	(x < 0xA0)
 #define IS_EXFAT_BENIGN_PRI(x)		(x < 0xC0)
@@ -155,6 +158,24 @@ struct exfat_dentry {
 			__le32 start_clu;
 			__le64 size;
 		} __packed upcase; /* up-case table directory entry */
+		struct {
+			__u8 flags;
+			__u8 vendor_guid[16];
+			__u8 vendor_defined[14];
+		} __packed vendor_ext; /* vendor extension directory entry */
+		struct {
+			__u8 flags;
+			__u8 vendor_guid[16];
+			__u8 vendor_defined[2];
+			__le32 start_clu;
+			__le64 size;
+		} __packed vendor_alloc; /* vendor allocation directory entry */
+		struct {
+			__u8 flags;
+			__u8 custom_defined[18];
+			__le32 start_clu;
+			__le64 size;
+		} __packed generic_secondary; /* generic secondary directory entry */
 	} __packed dentry;
 } __packed;
 
diff --git a/fs/exfat/fatent.c b/fs/exfat/fatent.c
index 41ae4cce1f42..56b870d9cc0d 100644
--- a/fs/exfat/fatent.c
+++ b/fs/exfat/fatent.c
@@ -307,7 +307,7 @@ int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc,
 		struct exfat_chain *p_chain, bool sync_bmap)
 {
 	int ret = -ENOSPC;
-	unsigned int num_clusters = 0, total_cnt;
+	unsigned int total_cnt;
 	unsigned int hint_clu, new_clu, last_clu = EXFAT_EOF_CLUSTER;
 	struct super_block *sb = inode->i_sb;
 	struct exfat_sb_info *sbi = EXFAT_SB(sb);
@@ -344,17 +344,11 @@ int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc,
 
 	/* check cluster validation */
 	if (!is_valid_cluster(sbi, hint_clu)) {
-		exfat_err(sb, "hint_cluster is invalid (%u)",
-			hint_clu);
+		if (hint_clu != sbi->num_clusters)
+			exfat_err(sb, "hint_cluster is invalid (%u), rewind to the first cluster",
+					hint_clu);
 		hint_clu = EXFAT_FIRST_CLUSTER;
-		if (p_chain->flags == ALLOC_NO_FAT_CHAIN) {
-			if (exfat_chain_cont_cluster(sb, p_chain->dir,
-					num_clusters)) {
-				ret = -EIO;
-				goto unlock;
-			}
-			p_chain->flags = ALLOC_FAT_CHAIN;
-		}
+		p_chain->flags = ALLOC_FAT_CHAIN;
 	}
 
 	p_chain->dir = EXFAT_EOF_CLUSTER;
@@ -364,7 +358,7 @@ int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc,
 		if (new_clu != hint_clu &&
 		    p_chain->flags == ALLOC_NO_FAT_CHAIN) {
 			if (exfat_chain_cont_cluster(sb, p_chain->dir,
-					num_clusters)) {
+					p_chain->size)) {
 				ret = -EIO;
 				goto free_cluster;
 			}
@@ -377,8 +371,6 @@ int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc,
 			goto free_cluster;
 		}
 
-		num_clusters++;
-
 		/* update FAT table */
 		if (p_chain->flags == ALLOC_FAT_CHAIN) {
 			if (exfat_ent_set(sb, new_clu, EXFAT_EOF_CLUSTER)) {
@@ -395,13 +387,14 @@ int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc,
 				goto free_cluster;
 			}
 		}
+		p_chain->size++;
+
 		last_clu = new_clu;
 
-		if (--num_alloc == 0) {
+		if (p_chain->size == num_alloc) {
 			sbi->clu_srch_ptr = hint_clu;
-			sbi->used_clusters += num_clusters;
+			sbi->used_clusters += num_alloc;
 
-			p_chain->size += num_clusters;
 			mutex_unlock(&sbi->bitmap_lock);
 			return 0;
 		}
@@ -412,7 +405,7 @@ int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc,
 
 			if (p_chain->flags == ALLOC_NO_FAT_CHAIN) {
 				if (exfat_chain_cont_cluster(sb, p_chain->dir,
-						num_clusters)) {
+						p_chain->size)) {
 					ret = -EIO;
 					goto free_cluster;
 				}
@@ -421,8 +414,7 @@ int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc,
 		}
 	}
 free_cluster:
-	if (num_clusters)
-		__exfat_free_cluster(inode, p_chain);
+	__exfat_free_cluster(inode, p_chain);
 unlock:
 	mutex_unlock(&sbi->bitmap_lock);
 	return ret;
diff --git a/fs/exfat/file.c b/fs/exfat/file.c
index 1fdb0a64b91d..e99183a74611 100644
--- a/fs/exfat/file.c
+++ b/fs/exfat/file.c
@@ -209,8 +209,7 @@ void exfat_truncate(struct inode *inode)
 	if (err)
 		goto write_size;
 
-	inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >>
-				inode->i_blkbits;
+	inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >> 9;
 write_size:
 	aligned_size = i_size_read(inode);
 	if (aligned_size & (blocksize - 1)) {
diff --git a/fs/exfat/inode.c b/fs/exfat/inode.c
index 5b644cb057fa..481dd338f2b8 100644
--- a/fs/exfat/inode.c
+++ b/fs/exfat/inode.c
@@ -220,8 +220,7 @@ static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
 		num_clusters += num_to_be_allocated;
 		*clu = new_clu.dir;
 
-		inode->i_blocks +=
-			num_to_be_allocated << sbi->sect_per_clus_bits;
+		inode->i_blocks += EXFAT_CLU_TO_B(num_to_be_allocated, sbi) >> 9;
 
 		/*
 		 * Move *clu pointer along FAT chains (hole care) because the
@@ -576,8 +575,7 @@ static int exfat_fill_inode(struct inode *inode, struct exfat_dir_entry *info)
 
 	exfat_save_attr(inode, info->attr);
 
-	inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >>
-				inode->i_blkbits;
+	inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >> 9;
 	inode->i_mtime = info->mtime;
 	inode->i_ctime = info->mtime;
 	ei->i_crtime = info->crtime;
diff --git a/fs/exfat/namei.c b/fs/exfat/namei.c
index 02aab4c3a5f7..e0ff9d156f6f 100644
--- a/fs/exfat/namei.c
+++ b/fs/exfat/namei.c
@@ -396,7 +396,7 @@ static int exfat_find_empty_entry(struct inode *inode,
 		ei->i_size_ondisk += sbi->cluster_size;
 		ei->i_size_aligned += sbi->cluster_size;
 		ei->flags = p_dir->flags;
-		inode->i_blocks += 1 << sbi->sect_per_clus_bits;
+		inode->i_blocks += sbi->cluster_size >> 9;
 	}
 
 	return dentry;
diff --git a/fs/exfat/super.c b/fs/exfat/super.c
index 35f0305cd493..8c32460e031e 100644
--- a/fs/exfat/super.c
+++ b/fs/exfat/super.c
@@ -373,8 +373,7 @@ static int exfat_read_root(struct inode *inode)
 	inode->i_op = &exfat_dir_inode_operations;
 	inode->i_fop = &exfat_dir_operations;
 
-	inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >>
-				inode->i_blkbits;
+	inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >> 9;
 	ei->i_pos = ((loff_t)sbi->root_dir << 32) | 0xffffffff;
 	ei->i_size_aligned = i_size_read(inode);
 	ei->i_size_ondisk = i_size_read(inode);