/*

   * fs/f2fs/f2fs.h
   *
   * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   *             http://www.samsung.com/
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
  #ifndef _LINUX_F2FS_H
  #define _LINUX_F2FS_H
  
  #include <linux/types.h>
  #include <linux/page-flags.h>
  #include <linux/buffer_head.h>

  #include <linux/slab.h>
  #include <linux/crc32.h>
  #include <linux/magic.h>

  #include <linux/kobject.h>

  #include <linux/sched.h>

  #include <linux/vmalloc.h>

  #include <linux/bio.h>

  #include <linux/blkdev.h>

  #include <linux/fscrypto.h>

  #include <crypto/hash.h>

  #ifdef CONFIG_F2FS_CHECK_FS

  #define f2fs_bug_on(sbi, condition)	BUG_ON(condition)

  #else

  #define f2fs_bug_on(sbi, condition)					\
  	do {								\
  		if (unlikely(condition)) {				\
  			WARN_ON(1);					\

  			set_sbi_flag(sbi, SBI_NEED_FSCK);		\

  		}							\
  	} while (0)

  #endif

  #ifdef CONFIG_F2FS_FAULT_INJECTION
  enum {
  	FAULT_KMALLOC,

  	FAULT_PAGE_ALLOC,

  	FAULT_ALLOC_NID,
  	FAULT_ORPHAN,
  	FAULT_BLOCK,
  	FAULT_DIR_DEPTH,

  	FAULT_EVICT_INODE,

  	FAULT_IO,

  	FAULT_CHECKPOINT,

  	FAULT_MAX,
  };

  struct f2fs_fault_info {
  	atomic_t inject_ops;
  	unsigned int inject_rate;
  	unsigned int inject_type;
  };

  extern char *fault_name[FAULT_MAX];

  #define IS_FAULT_SET(fi, type) (fi->inject_type & (1 << (type)))

  #endif

  /*
   * For mount options
   */
  #define F2FS_MOUNT_BG_GC		0x00000001
  #define F2FS_MOUNT_DISABLE_ROLL_FORWARD	0x00000002
  #define F2FS_MOUNT_DISCARD		0x00000004
  #define F2FS_MOUNT_NOHEAP		0x00000008
  #define F2FS_MOUNT_XATTR_USER		0x00000010
  #define F2FS_MOUNT_POSIX_ACL		0x00000020
  #define F2FS_MOUNT_DISABLE_EXT_IDENTIFY	0x00000040

  #define F2FS_MOUNT_INLINE_XATTR		0x00000080

  #define F2FS_MOUNT_INLINE_DATA		0x00000100

  #define F2FS_MOUNT_INLINE_DENTRY	0x00000200
  #define F2FS_MOUNT_FLUSH_MERGE		0x00000400
  #define F2FS_MOUNT_NOBARRIER		0x00000800

  #define F2FS_MOUNT_FASTBOOT		0x00001000

  #define F2FS_MOUNT_EXTENT_CACHE		0x00002000

  #define F2FS_MOUNT_FORCE_FG_GC		0x00004000

  #define F2FS_MOUNT_DATA_FLUSH		0x00008000

  #define F2FS_MOUNT_FAULT_INJECTION	0x00010000

  #define F2FS_MOUNT_ADAPTIVE		0x00020000
  #define F2FS_MOUNT_LFS			0x00040000

  
  #define clear_opt(sbi, option)	(sbi->mount_opt.opt &= ~F2FS_MOUNT_##option)
  #define set_opt(sbi, option)	(sbi->mount_opt.opt |= F2FS_MOUNT_##option)
  #define test_opt(sbi, option)	(sbi->mount_opt.opt & F2FS_MOUNT_##option)
  
  #define ver_after(a, b)	(typecheck(unsigned long long, a) &&		\
  		typecheck(unsigned long long, b) &&			\
  		((long long)((a) - (b)) > 0))

  typedef u32 block_t;	/*
  			 * should not change u32, since it is the on-disk block
  			 * address format, __le32.
  			 */

  typedef u32 nid_t;
  
  struct f2fs_mount_info {
  	unsigned int	opt;
  };

  #define F2FS_FEATURE_ENCRYPT	0x0001

  #define F2FS_FEATURE_HMSMR	0x0002

  #define F2FS_HAS_FEATURE(sb, mask)					\
  	((F2FS_SB(sb)->raw_super->feature & cpu_to_le32(mask)) != 0)
  #define F2FS_SET_FEATURE(sb, mask)					\
  	F2FS_SB(sb)->raw_super->feature |= cpu_to_le32(mask)
  #define F2FS_CLEAR_FEATURE(sb, mask)					\
  	F2FS_SB(sb)->raw_super->feature &= ~cpu_to_le32(mask)

  /*
   * For checkpoint manager
   */
  enum {
  	NAT_BITMAP,
  	SIT_BITMAP
  };

  enum {
  	CP_UMOUNT,

  	CP_FASTBOOT,

  	CP_SYNC,

  	CP_RECOVERY,

  	CP_DISCARD,

  };

  #define DEF_BATCHED_TRIM_SECTIONS	2

  #define BATCHED_TRIM_SEGMENTS(sbi)	\
  		(SM_I(sbi)->trim_sections * (sbi)->segs_per_sec)

  #define BATCHED_TRIM_BLOCKS(sbi)	\
  		(BATCHED_TRIM_SEGMENTS(sbi) << (sbi)->log_blocks_per_seg)

  #define DEF_CP_INTERVAL			60	/* 60 secs */

  #define DEF_IDLE_INTERVAL		5	/* 5 secs */

  struct cp_control {
  	int reason;

  	__u64 trim_start;
  	__u64 trim_end;
  	__u64 trim_minlen;
  	__u64 trimmed;

  };

  /*

   * For CP/NAT/SIT/SSA readahead

   */
  enum {
  	META_CP,
  	META_NAT,

  	META_SIT,

  	META_SSA,
  	META_POR,

  };

  /* for the list of ino */
  enum {
  	ORPHAN_INO,		/* for orphan ino list */

  	APPEND_INO,		/* for append ino list */
  	UPDATE_INO,		/* for update ino list */

  	MAX_INO_ENTRY,		/* max. list */
  };
  
  struct ino_entry {

  	struct list_head list;	/* list head */
  	nid_t ino;		/* inode number */
  };

  /* for the list of inodes to be GCed */

  struct inode_entry {

  	struct list_head list;	/* list head */
  	struct inode *inode;	/* vfs inode pointer */
  };

  /* for the list of blockaddresses to be discarded */
  struct discard_entry {
  	struct list_head list;	/* list head */
  	block_t blkaddr;	/* block address to be discarded */
  	int len;		/* # of consecutive blocks of the discard */
  };

  struct bio_entry {
  	struct list_head list;
  	struct bio *bio;
  	struct completion event;
  	int error;
  };

  /* for the list of fsync inodes, used only during recovery */
  struct fsync_inode_entry {
  	struct list_head list;	/* list head */
  	struct inode *inode;	/* vfs inode pointer */

  	block_t blkaddr;	/* block address locating the last fsync */
  	block_t last_dentry;	/* block address locating the last dentry */

  };

  #define nats_in_cursum(jnl)		(le16_to_cpu(jnl->n_nats))
  #define sits_in_cursum(jnl)		(le16_to_cpu(jnl->n_sits))

  #define nat_in_journal(jnl, i)		(jnl->nat_j.entries[i].ne)
  #define nid_in_journal(jnl, i)		(jnl->nat_j.entries[i].nid)
  #define sit_in_journal(jnl, i)		(jnl->sit_j.entries[i].se)
  #define segno_in_journal(jnl, i)	(jnl->sit_j.entries[i].segno)

  #define MAX_NAT_JENTRIES(jnl)	(NAT_JOURNAL_ENTRIES - nats_in_cursum(jnl))
  #define MAX_SIT_JENTRIES(jnl)	(SIT_JOURNAL_ENTRIES - sits_in_cursum(jnl))

  static inline int update_nats_in_cursum(struct f2fs_journal *journal, int i)

  {

  	int before = nats_in_cursum(journal);
  	journal->n_nats = cpu_to_le16(before + i);

  	return before;
  }

  static inline int update_sits_in_cursum(struct f2fs_journal *journal, int i)

  {

  	int before = sits_in_cursum(journal);
  	journal->n_sits = cpu_to_le16(before + i);

  	return before;
  }

  static inline bool __has_cursum_space(struct f2fs_journal *journal,
  							int size, int type)

  {
  	if (type == NAT_JOURNAL)

  		return size <= MAX_NAT_JENTRIES(journal);
  	return size <= MAX_SIT_JENTRIES(journal);

  }

  /*

   * ioctl commands
   */

  #define F2FS_IOC_GETFLAGS		FS_IOC_GETFLAGS
  #define F2FS_IOC_SETFLAGS		FS_IOC_SETFLAGS

  #define F2FS_IOC_GETVERSION		FS_IOC_GETVERSION

  
  #define F2FS_IOCTL_MAGIC		0xf5
  #define F2FS_IOC_START_ATOMIC_WRITE	_IO(F2FS_IOCTL_MAGIC, 1)
  #define F2FS_IOC_COMMIT_ATOMIC_WRITE	_IO(F2FS_IOCTL_MAGIC, 2)

  #define F2FS_IOC_START_VOLATILE_WRITE	_IO(F2FS_IOCTL_MAGIC, 3)

  #define F2FS_IOC_RELEASE_VOLATILE_WRITE	_IO(F2FS_IOCTL_MAGIC, 4)
  #define F2FS_IOC_ABORT_VOLATILE_WRITE	_IO(F2FS_IOCTL_MAGIC, 5)

  #define F2FS_IOC_GARBAGE_COLLECT	_IO(F2FS_IOCTL_MAGIC, 6)

  #define F2FS_IOC_WRITE_CHECKPOINT	_IO(F2FS_IOCTL_MAGIC, 7)

  #define F2FS_IOC_DEFRAGMENT		_IO(F2FS_IOCTL_MAGIC, 8)

  #define F2FS_IOC_MOVE_RANGE		_IOWR(F2FS_IOCTL_MAGIC, 9,	\
  						struct f2fs_move_range)

  #define F2FS_IOC_SET_ENCRYPTION_POLICY	FS_IOC_SET_ENCRYPTION_POLICY
  #define F2FS_IOC_GET_ENCRYPTION_POLICY	FS_IOC_GET_ENCRYPTION_POLICY
  #define F2FS_IOC_GET_ENCRYPTION_PWSALT	FS_IOC_GET_ENCRYPTION_PWSALT

  /*
   * should be same as XFS_IOC_GOINGDOWN.
   * Flags for going down operation used by FS_IOC_GOINGDOWN
   */
  #define F2FS_IOC_SHUTDOWN	_IOR('X', 125, __u32)	/* Shutdown */
  #define F2FS_GOING_DOWN_FULLSYNC	0x0	/* going down with full sync */
  #define F2FS_GOING_DOWN_METASYNC	0x1	/* going down with metadata */
  #define F2FS_GOING_DOWN_NOSYNC		0x2	/* going down */

  #define F2FS_GOING_DOWN_METAFLUSH	0x3	/* going down with meta flush */

  #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
  /*
   * ioctl commands in 32 bit emulation
   */

  #define F2FS_IOC32_GETFLAGS		FS_IOC32_GETFLAGS
  #define F2FS_IOC32_SETFLAGS		FS_IOC32_SETFLAGS
  #define F2FS_IOC32_GETVERSION		FS_IOC32_GETVERSION

  #endif

  struct f2fs_defragment {
  	u64 start;
  	u64 len;
  };

  struct f2fs_move_range {
  	u32 dst_fd;		/* destination fd */
  	u64 pos_in;		/* start position in src_fd */
  	u64 pos_out;		/* start position in dst_fd */
  	u64 len;		/* size to move */
  };

  /*

   * For INODE and NODE manager
   */

  /* for directory operations */
  struct f2fs_dentry_ptr {

  	struct inode *inode;

  	const void *bitmap;
  	struct f2fs_dir_entry *dentry;
  	__u8 (*filename)[F2FS_SLOT_LEN];
  	int max;
  };

  static inline void make_dentry_ptr(struct inode *inode,
  		struct f2fs_dentry_ptr *d, void *src, int type)

  {

  	d->inode = inode;

  	if (type == 1) {
  		struct f2fs_dentry_block *t = (struct f2fs_dentry_block *)src;
  		d->max = NR_DENTRY_IN_BLOCK;
  		d->bitmap = &t->dentry_bitmap;
  		d->dentry = t->dentry;
  		d->filename = t->filename;
  	} else {
  		struct f2fs_inline_dentry *t = (struct f2fs_inline_dentry *)src;
  		d->max = NR_INLINE_DENTRY;
  		d->bitmap = &t->dentry_bitmap;
  		d->dentry = t->dentry;
  		d->filename = t->filename;
  	}
  }

  /*
   * XATTR_NODE_OFFSET stores xattrs to one node block per file keeping -1
   * as its node offset to distinguish from index node blocks.
   * But some bits are used to mark the node block.
   */
  #define XATTR_NODE_OFFSET	((((unsigned int)-1) << OFFSET_BIT_SHIFT) \
  				>> OFFSET_BIT_SHIFT)

  enum {
  	ALLOC_NODE,			/* allocate a new node page if needed */
  	LOOKUP_NODE,			/* look up a node without readahead */
  	LOOKUP_NODE_RA,			/*
  					 * look up a node with readahead called

  					 * by get_data_block.

  					 */

  };

  #define F2FS_LINK_MAX	0xffffffff	/* maximum link count per file */

  #define MAX_DIR_RA_PAGES	4	/* maximum ra pages of dir */

  /* vector size for gang look-up from extent cache that consists of radix tree */
  #define EXT_TREE_VEC_SIZE	64

  /* for in-memory extent cache entry */

  #define F2FS_MIN_EXTENT_LEN	64	/* minimum extent length */
  
  /* number of extent info in extent cache we try to shrink */
  #define EXTENT_CACHE_SHRINK_NUMBER	128

  struct extent_info {

  	unsigned int fofs;		/* start offset in a file */
  	u32 blk;			/* start block address of the extent */
  	unsigned int len;		/* length of the extent */
  };
  
  struct extent_node {
  	struct rb_node rb_node;		/* rb node located in rb-tree */
  	struct list_head list;		/* node in global extent list of sbi */
  	struct extent_info ei;		/* extent info */

  	struct extent_tree *et;		/* extent tree pointer */

  };
  
  struct extent_tree {
  	nid_t ino;			/* inode number */
  	struct rb_root root;		/* root of extent info rb-tree */

  	struct extent_node *cached_en;	/* recently accessed extent node */

  	struct extent_info largest;	/* largested extent info */

  	struct list_head list;		/* to be used by sbi->zombie_list */

  	rwlock_t lock;			/* protect extent info rb-tree */

  	atomic_t node_cnt;		/* # of extent node in rb-tree*/

  };
  
  /*

   * This structure is taken from ext4_map_blocks.
   *
   * Note that, however, f2fs uses NEW and MAPPED flags for f2fs_map_blocks().
   */
  #define F2FS_MAP_NEW		(1 << BH_New)
  #define F2FS_MAP_MAPPED		(1 << BH_Mapped)

  #define F2FS_MAP_UNWRITTEN	(1 << BH_Unwritten)
  #define F2FS_MAP_FLAGS		(F2FS_MAP_NEW | F2FS_MAP_MAPPED |\
  				F2FS_MAP_UNWRITTEN)

  
  struct f2fs_map_blocks {
  	block_t m_pblk;
  	block_t m_lblk;
  	unsigned int m_len;
  	unsigned int m_flags;

  	pgoff_t *m_next_pgofs;		/* point next possible non-hole pgofs */

  };

  /* for flag in get_data_block */
  #define F2FS_GET_BLOCK_READ		0
  #define F2FS_GET_BLOCK_DIO		1
  #define F2FS_GET_BLOCK_FIEMAP		2
  #define F2FS_GET_BLOCK_BMAP		3

  #define F2FS_GET_BLOCK_PRE_DIO		4

  #define F2FS_GET_BLOCK_PRE_AIO		5

  /*

   * i_advise uses FADVISE_XXX_BIT. We can add additional hints later.
   */
  #define FADVISE_COLD_BIT	0x01

  #define FADVISE_LOST_PINO_BIT	0x02

  #define FADVISE_ENCRYPT_BIT	0x04

  #define FADVISE_ENC_NAME_BIT	0x08

  #define file_is_cold(inode)	is_file(inode, FADVISE_COLD_BIT)
  #define file_wrong_pino(inode)	is_file(inode, FADVISE_LOST_PINO_BIT)
  #define file_set_cold(inode)	set_file(inode, FADVISE_COLD_BIT)
  #define file_lost_pino(inode)	set_file(inode, FADVISE_LOST_PINO_BIT)
  #define file_clear_cold(inode)	clear_file(inode, FADVISE_COLD_BIT)
  #define file_got_pino(inode)	clear_file(inode, FADVISE_LOST_PINO_BIT)

  #define file_is_encrypt(inode)	is_file(inode, FADVISE_ENCRYPT_BIT)
  #define file_set_encrypt(inode)	set_file(inode, FADVISE_ENCRYPT_BIT)
  #define file_clear_encrypt(inode) clear_file(inode, FADVISE_ENCRYPT_BIT)

  #define file_enc_name(inode)	is_file(inode, FADVISE_ENC_NAME_BIT)
  #define file_set_enc_name(inode) set_file(inode, FADVISE_ENC_NAME_BIT)

  #define DEF_DIR_LEVEL		0

  struct f2fs_inode_info {
  	struct inode vfs_inode;		/* serve a vfs inode */
  	unsigned long i_flags;		/* keep an inode flags for ioctl */
  	unsigned char i_advise;		/* use to give file attribute hints */

  	unsigned char i_dir_level;	/* use for dentry level for large dir */

  	unsigned int i_current_depth;	/* use only in directory structure */

  	unsigned int i_pino;		/* parent inode number */

  	umode_t i_acl_mode;		/* keep file acl mode temporarily */
  
  	/* Use below internally in f2fs*/
  	unsigned long flags;		/* use to pass per-file flags */

  	struct rw_semaphore i_sem;	/* protect fi info */

  	atomic_t dirty_pages;		/* # of dirty pages */

  	f2fs_hash_t chash;		/* hash value of given file name */
  	unsigned int clevel;		/* maximum level of given file name */
  	nid_t i_xattr_nid;		/* node id that contains xattrs */

  	unsigned long long xattr_ver;	/* cp version of xattr modification */

  	loff_t	last_disk_size;		/* lastly written file size */

  	struct list_head dirty_list;	/* dirty list for dirs and files */
  	struct list_head gdirty_list;	/* linked in global dirty list */

  	struct list_head inmem_pages;	/* inmemory pages managed by f2fs */
  	struct mutex inmem_lock;	/* lock for inmemory pages */

  	struct extent_tree *extent_tree;	/* cached extent_tree entry */

  	struct rw_semaphore dio_rwsem[2];/* avoid racing between dio and gc */

  };
  
  static inline void get_extent_info(struct extent_info *ext,

  					struct f2fs_extent *i_ext)

  {

  	ext->fofs = le32_to_cpu(i_ext->fofs);
  	ext->blk = le32_to_cpu(i_ext->blk);
  	ext->len = le32_to_cpu(i_ext->len);

  }
  
  static inline void set_raw_extent(struct extent_info *ext,
  					struct f2fs_extent *i_ext)
  {

  	i_ext->fofs = cpu_to_le32(ext->fofs);

  	i_ext->blk = cpu_to_le32(ext->blk);

  	i_ext->len = cpu_to_le32(ext->len);

  }

  static inline void set_extent_info(struct extent_info *ei, unsigned int fofs,
  						u32 blk, unsigned int len)
  {
  	ei->fofs = fofs;
  	ei->blk = blk;
  	ei->len = len;
  }

  static inline bool __is_extent_same(struct extent_info *ei1,
  						struct extent_info *ei2)
  {
  	return (ei1->fofs == ei2->fofs && ei1->blk == ei2->blk &&
  						ei1->len == ei2->len);
  }

  static inline bool __is_extent_mergeable(struct extent_info *back,
  						struct extent_info *front)
  {
  	return (back->fofs + back->len == front->fofs &&
  			back->blk + back->len == front->blk);
  }
  
  static inline bool __is_back_mergeable(struct extent_info *cur,
  						struct extent_info *back)
  {
  	return __is_extent_mergeable(back, cur);
  }
  
  static inline bool __is_front_mergeable(struct extent_info *cur,
  						struct extent_info *front)
  {
  	return __is_extent_mergeable(cur, front);
  }

  extern void f2fs_mark_inode_dirty_sync(struct inode *);

  static inline void __try_update_largest_extent(struct inode *inode,
  			struct extent_tree *et, struct extent_node *en)

  {

  	if (en->ei.len > et->largest.len) {

  		et->largest = en->ei;

  		f2fs_mark_inode_dirty_sync(inode);

  	}

  }

  struct f2fs_nm_info {
  	block_t nat_blkaddr;		/* base disk address of NAT */
  	nid_t max_nid;			/* maximum possible node ids */

  	nid_t available_nids;		/* maximum available node ids */

  	nid_t next_scan_nid;		/* the next nid to be scanned */

  	unsigned int ram_thresh;	/* control the memory footprint */

  	unsigned int ra_nid_pages;	/* # of nid pages to be readaheaded */

  	unsigned int dirty_nats_ratio;	/* control dirty nats ratio threshold */

  
  	/* NAT cache management */
  	struct radix_tree_root nat_root;/* root of the nat entry cache */

  	struct radix_tree_root nat_set_root;/* root of the nat set cache */

  	struct rw_semaphore nat_tree_lock;	/* protect nat_tree_lock */

  	struct list_head nat_entries;	/* cached nat entry list (clean) */

  	unsigned int nat_cnt;		/* the # of cached nat entries */

  	unsigned int dirty_nat_cnt;	/* total num of nat entries in set */

  
  	/* free node ids management */

  	struct radix_tree_root free_nid_root;/* root of the free_nid cache */

  	struct list_head free_nid_list;	/* a list for free nids */
  	spinlock_t free_nid_list_lock;	/* protect free nid list */
  	unsigned int fcnt;		/* the number of free node id */
  	struct mutex build_lock;	/* lock for build free nids */
  
  	/* for checkpoint */
  	char *nat_bitmap;		/* NAT bitmap pointer */
  	int bitmap_size;		/* bitmap size */
  };
  
  /*
   * this structure is used as one of function parameters.
   * all the information are dedicated to a given direct node block determined
   * by the data offset in a file.
   */
  struct dnode_of_data {
  	struct inode *inode;		/* vfs inode pointer */
  	struct page *inode_page;	/* its inode page, NULL is possible */
  	struct page *node_page;		/* cached direct node page */
  	nid_t nid;			/* node id of the direct node block */
  	unsigned int ofs_in_node;	/* data offset in the node page */
  	bool inode_page_locked;		/* inode page is locked or not */

  	bool node_changed;		/* is node block changed */

  	char cur_level;			/* level of hole node page */
  	char max_level;			/* level of current page located */

  	block_t	data_blkaddr;		/* block address of the node block */
  };
  
  static inline void set_new_dnode(struct dnode_of_data *dn, struct inode *inode,
  		struct page *ipage, struct page *npage, nid_t nid)
  {

  	memset(dn, 0, sizeof(*dn));

  	dn->inode = inode;
  	dn->inode_page = ipage;
  	dn->node_page = npage;
  	dn->nid = nid;

  }
  
  /*
   * For SIT manager
   *
   * By default, there are 6 active log areas across the whole main area.
   * When considering hot and cold data separation to reduce cleaning overhead,
   * we split 3 for data logs and 3 for node logs as hot, warm, and cold types,
   * respectively.
   * In the current design, you should not change the numbers intentionally.
   * Instead, as a mount option such as active_logs=x, you can use 2, 4, and 6
   * logs individually according to the underlying devices. (default: 6)
   * Just in case, on-disk layout covers maximum 16 logs that consist of 8 for
   * data and 8 for node logs.
   */
  #define	NR_CURSEG_DATA_TYPE	(3)
  #define NR_CURSEG_NODE_TYPE	(3)
  #define NR_CURSEG_TYPE	(NR_CURSEG_DATA_TYPE + NR_CURSEG_NODE_TYPE)
  
  enum {
  	CURSEG_HOT_DATA	= 0,	/* directory entry blocks */
  	CURSEG_WARM_DATA,	/* data blocks */
  	CURSEG_COLD_DATA,	/* multimedia or GCed data blocks */
  	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_DIRECT_IO,	/* to use for the direct IO path */

  };

  struct flush_cmd {

  	struct completion wait;

  	struct llist_node llnode;

  	int ret;
  };

  struct flush_cmd_control {
  	struct task_struct *f2fs_issue_flush;	/* flush thread */
  	wait_queue_head_t flush_wait_queue;	/* waiting queue for wake-up */

  	atomic_t submit_flush;			/* # of issued flushes */

  	struct llist_head issue_list;		/* list for command issue */
  	struct llist_node *dispatch_list;	/* list for command dispatch */

  };

  struct f2fs_sm_info {
  	struct sit_info *sit_info;		/* whole segment information */
  	struct free_segmap_info *free_info;	/* free segment information */
  	struct dirty_seglist_info *dirty_info;	/* dirty segment information */
  	struct curseg_info *curseg_array;	/* active segment information */

  	block_t seg0_blkaddr;		/* block address of 0'th segment */
  	block_t main_blkaddr;		/* start block address of main area */
  	block_t ssa_blkaddr;		/* start block address of SSA area */
  
  	unsigned int segment_count;	/* total # of segments */
  	unsigned int main_segments;	/* # of segments in main area */
  	unsigned int reserved_segments;	/* # of reserved segments */
  	unsigned int ovp_segments;	/* # of overprovision segments */

  
  	/* a threshold to reclaim prefree segments */
  	unsigned int rec_prefree_segments;

  
  	/* for small discard management */
  	struct list_head discard_list;		/* 4KB discard list */

  	struct list_head wait_list;		/* linked with issued discard bio */

  	int nr_discards;			/* # of discards in the list */
  	int max_discards;			/* max. discards to be issued */

  	/* for batched trimming */
  	unsigned int trim_sections;		/* # of sections to trim */

  	struct list_head sit_entry_set;	/* sit entry set list */

  	unsigned int ipu_policy;	/* in-place-update policy */
  	unsigned int min_ipu_util;	/* in-place-update threshold */

  	unsigned int min_fsync_blocks;	/* threshold for fsync */

  
  	/* for flush command control */

  	struct flush_cmd_control *cmd_control_info;

  };
  
  /*

   * For superblock
   */
  /*
   * COUNT_TYPE for monitoring
   *
   * f2fs monitors the number of several block types such as on-writeback,
   * dirty dentry blocks, dirty node blocks, and dirty meta blocks.
   */
  enum count_type {

  	F2FS_DIRTY_DENTS,

  	F2FS_DIRTY_DATA,

  	F2FS_DIRTY_NODES,
  	F2FS_DIRTY_META,

  	F2FS_INMEM_PAGES,

  	F2FS_DIRTY_IMETA,

  	NR_COUNT_TYPE,
  };
  
  /*

   * The below are the page types of bios used in submit_bio().

   * The available types are:
   * DATA			User data pages. It operates as async mode.
   * NODE			Node pages. It operates as async mode.
   * META			FS metadata pages such as SIT, NAT, CP.
   * NR_PAGE_TYPE		The number of page types.
   * META_FLUSH		Make sure the previous pages are written
   *			with waiting the bio's completion
   * ...			Only can be used with META.
   */

  #define PAGE_TYPE_OF_BIO(type)	((type) > META ? META : (type))

  enum page_type {
  	DATA,
  	NODE,
  	META,
  	NR_PAGE_TYPE,
  	META_FLUSH,

  	INMEM,		/* the below types are used by tracepoints only. */
  	INMEM_DROP,

  	INMEM_REVOKE,

  	IPU,
  	OPU,

  };

  struct f2fs_io_info {

  	struct f2fs_sb_info *sbi;	/* f2fs_sb_info pointer */

  	enum page_type type;	/* contains DATA/NODE/META/META_FLUSH */

  	int op;			/* contains REQ_OP_ */
  	int op_flags;		/* rq_flag_bits */

  	block_t new_blkaddr;	/* new block address to be written */

  	block_t old_blkaddr;	/* old block address before Cow */

  	struct page *page;	/* page to be written */

  	struct page *encrypted_page;	/* encrypted page */

  };

  #define is_read_io(rw) (rw == READ)

  struct f2fs_bio_info {

  	struct f2fs_sb_info *sbi;	/* f2fs superblock */

  	struct bio *bio;		/* bios to merge */
  	sector_t last_block_in_bio;	/* last block number */

  	struct f2fs_io_info fio;	/* store buffered io info. */

  	struct rw_semaphore io_rwsem;	/* blocking op for bio */

  };

  enum inode_type {
  	DIR_INODE,			/* for dirty dir inode */
  	FILE_INODE,			/* for dirty regular/symlink inode */

  	DIRTY_META,			/* for all dirtied inode metadata */

  	NR_INODE_TYPE,
  };

  /* for inner inode cache management */
  struct inode_management {
  	struct radix_tree_root ino_root;	/* ino entry array */
  	spinlock_t ino_lock;			/* for ino entry lock */
  	struct list_head ino_list;		/* inode list head */
  	unsigned long ino_num;			/* number of entries */
  };

  /* For s_flag in struct f2fs_sb_info */
  enum {
  	SBI_IS_DIRTY,				/* dirty flag for checkpoint */
  	SBI_IS_CLOSE,				/* specify unmounting */
  	SBI_NEED_FSCK,				/* need fsck.f2fs to fix */
  	SBI_POR_DOING,				/* recovery is doing or not */

  	SBI_NEED_SB_WRITE,			/* need to recover superblock */

  	SBI_NEED_CP,				/* need to checkpoint */

  };

  enum {
  	CP_TIME,

  	REQ_TIME,

  	MAX_TIME,
  };

  #ifdef CONFIG_F2FS_FS_ENCRYPTION
  #define F2FS_KEY_DESC_PREFIX "f2fs:"
  #define F2FS_KEY_DESC_PREFIX_SIZE 5
  #endif

  struct f2fs_sb_info {
  	struct super_block *sb;			/* pointer to VFS super block */

  	struct proc_dir_entry *s_proc;		/* proc entry */

  	struct f2fs_super_block *raw_super;	/* raw super block pointer */

  	int valid_super_block;			/* valid super block no */

  	unsigned long s_flag;				/* flags for sbi */

  #ifdef CONFIG_F2FS_FS_ENCRYPTION
  	u8 key_prefix[F2FS_KEY_DESC_PREFIX_SIZE];
  	u8 key_prefix_size;
  #endif

  	/* for node-related operations */
  	struct f2fs_nm_info *nm_info;		/* node manager */
  	struct inode *node_inode;		/* cache node blocks */
  
  	/* for segment-related operations */
  	struct f2fs_sm_info *sm_info;		/* segment manager */

  
  	/* for bio operations */

  	struct f2fs_bio_info read_io;			/* for read bios */

  	struct f2fs_bio_info write_io[NR_PAGE_TYPE];	/* for write bios */

  	struct mutex wio_mutex[NODE + 1];	/* bio ordering for NODE/DATA */

  
  	/* for checkpoint */
  	struct f2fs_checkpoint *ckpt;		/* raw checkpoint pointer */

  	int cur_cp_pack;			/* remain current cp pack */

  	spinlock_t cp_lock;			/* for flag in ckpt */

  	struct inode *meta_inode;		/* cache meta blocks */

  	struct mutex cp_mutex;			/* checkpoint procedure lock */

  	struct rw_semaphore cp_rwsem;		/* blocking FS operations */

  	struct rw_semaphore node_write;		/* locking node writes */

  	wait_queue_head_t cp_wait;

  	unsigned long last_time[MAX_TIME];	/* to store time in jiffies */
  	long interval_time[MAX_TIME];		/* to store thresholds */

  	struct inode_management im[MAX_INO_ENTRY];      /* manage inode cache */

  
  	/* for orphan inode, use 0'th array */

  	unsigned int max_orphans;		/* max orphan inodes */

  	/* for inode management */
  	struct list_head inode_list[NR_INODE_TYPE];	/* dirty inode list */
  	spinlock_t inode_lock[NR_INODE_TYPE];	/* for dirty inode list lock */

  	/* for extent tree cache */
  	struct radix_tree_root extent_tree_root;/* cache extent cache entries */
  	struct rw_semaphore extent_tree_lock;	/* locking extent radix tree */
  	struct list_head extent_list;		/* lru list for shrinker */
  	spinlock_t extent_lock;			/* locking extent lru list */

  	atomic_t total_ext_tree;		/* extent tree count */

  	struct list_head zombie_list;		/* extent zombie tree list */

  	atomic_t total_zombie_tree;		/* extent zombie tree count */

  	atomic_t total_ext_node;		/* extent info count */

  	/* basic filesystem units */

  	unsigned int log_sectors_per_block;	/* log2 sectors per block */
  	unsigned int log_blocksize;		/* log2 block size */
  	unsigned int blocksize;			/* block size */
  	unsigned int root_ino_num;		/* root inode number*/
  	unsigned int node_ino_num;		/* node inode number*/
  	unsigned int meta_ino_num;		/* meta inode number*/
  	unsigned int log_blocks_per_seg;	/* log2 blocks per segment */
  	unsigned int blocks_per_seg;		/* blocks per segment */
  	unsigned int segs_per_sec;		/* segments per section */
  	unsigned int secs_per_zone;		/* sections per zone */
  	unsigned int total_sections;		/* total section count */
  	unsigned int total_node_count;		/* total node block count */
  	unsigned int total_valid_node_count;	/* valid node block count */

  	loff_t max_file_blocks;			/* max block index of file */

  	int active_logs;			/* # of active logs */

  	int dir_level;				/* directory level */

  
  	block_t user_block_count;		/* # of user blocks */
  	block_t total_valid_block_count;	/* # of valid blocks */

  	block_t discard_blks;			/* discard command candidats */

  	block_t last_valid_block_count;		/* for recovery */
  	u32 s_next_generation;			/* for NFS support */

  	atomic_t nr_wb_bios;			/* # of writeback bios */

  
  	/* # of pages, see count_type */

  	atomic_t nr_pages[NR_COUNT_TYPE];

  	/* # of allocated blocks */
  	struct percpu_counter alloc_valid_block_count;

  	/* valid inode count */
  	struct percpu_counter total_valid_inode_count;

  	struct f2fs_mount_info mount_opt;	/* mount options */
  
  	/* for cleaning operations */
  	struct mutex gc_mutex;			/* mutex for GC */
  	struct f2fs_gc_kthread	*gc_thread;	/* GC thread */

  	unsigned int cur_victim_sec;		/* current victim section num */

  	/* maximum # of trials to find a victim segment for SSR and GC */
  	unsigned int max_victim_search;

  	/*
  	 * for stat information.
  	 * one is for the LFS mode, and the other is for the SSR mode.
  	 */

  #ifdef CONFIG_F2FS_STAT_FS

  	struct f2fs_stat_info *stat_info;	/* FS status information */
  	unsigned int segment_count[2];		/* # of allocated segments */
  	unsigned int block_count[2];		/* # of allocated blocks */

  	atomic_t inplace_count;		/* # of inplace update */

  	atomic64_t total_hit_ext;		/* # of lookup extent cache */
  	atomic64_t read_hit_rbtree;		/* # of hit rbtree extent node */
  	atomic64_t read_hit_largest;		/* # of hit largest extent node */
  	atomic64_t read_hit_cached;		/* # of hit cached extent node */

  	atomic_t inline_xattr;			/* # of inline_xattr inodes */

  	atomic_t inline_inode;			/* # of inline_data inodes */
  	atomic_t inline_dir;			/* # of inline_dentry inodes */

  	int bg_gc;				/* background gc calls */

  	unsigned int ndirty_inode[NR_INODE_TYPE];	/* # of dirty inodes */

  #endif
  	unsigned int last_victim[2];		/* last victim segment # */

  	spinlock_t stat_lock;			/* lock for stat operations */

  
  	/* For sysfs suppport */
  	struct kobject s_kobj;
  	struct completion s_kobj_unregister;

  
  	/* For shrinker support */
  	struct list_head s_list;
  	struct mutex umount_mutex;
  	unsigned int shrinker_run_no;

  
  	/* For write statistics */
  	u64 sectors_written_start;
  	u64 kbytes_written;

  
  	/* Reference to checksum algorithm driver via cryptoapi */
  	struct crypto_shash *s_chksum_driver;

  
  	/* For fault injection */
  #ifdef CONFIG_F2FS_FAULT_INJECTION
  	struct f2fs_fault_info fault_info;
  #endif

  };

  #ifdef CONFIG_F2FS_FAULT_INJECTION
  static inline bool time_to_inject(struct f2fs_sb_info *sbi, int type)
  {
  	struct f2fs_fault_info *ffi = &sbi->fault_info;
  
  	if (!ffi->inject_rate)
  		return false;
  
  	if (!IS_FAULT_SET(ffi, type))
  		return false;
  
  	atomic_inc(&ffi->inject_ops);
  	if (atomic_read(&ffi->inject_ops) >= ffi->inject_rate) {
  		atomic_set(&ffi->inject_ops, 0);
  		printk("%sF2FS-fs : inject %s in %pF
  ",
  				KERN_INFO,
  				fault_name[type],
  				__builtin_return_address(0));
  		return true;
  	}
  	return false;
  }
  #endif

  /* For write statistics. Suppose sector size is 512 bytes,
   * and the return value is in kbytes. s is of struct f2fs_sb_info.
   */
  #define BD_PART_WRITTEN(s)						 \
  (((u64)part_stat_read(s->sb->s_bdev->bd_part, sectors[1]) -		 \
  		s->sectors_written_start) >> 1)

  static inline void f2fs_update_time(struct f2fs_sb_info *sbi, int type)
  {
  	sbi->last_time[type] = jiffies;
  }
  
  static inline bool f2fs_time_over(struct f2fs_sb_info *sbi, int type)
  {
  	struct timespec ts = {sbi->interval_time[type], 0};
  	unsigned long interval = timespec_to_jiffies(&ts);
  
  	return time_after(jiffies, sbi->last_time[type] + interval);
  }

  static inline bool is_idle(struct f2fs_sb_info *sbi)
  {
  	struct block_device *bdev = sbi->sb->s_bdev;
  	struct request_queue *q = bdev_get_queue(bdev);
  	struct request_list *rl = &q->root_rl;
  
  	if (rl->count[BLK_RW_SYNC] || rl->count[BLK_RW_ASYNC])
  		return 0;
  
  	return f2fs_time_over(sbi, REQ_TIME);
  }

  /*
   * Inline functions
   */

  static inline u32 f2fs_crc32(struct f2fs_sb_info *sbi, const void *address,
  			   unsigned int length)
  {
  	SHASH_DESC_ON_STACK(shash, sbi->s_chksum_driver);
  	u32 *ctx = (u32 *)shash_desc_ctx(shash);
  	int err;
  
  	shash->tfm = sbi->s_chksum_driver;
  	shash->flags = 0;
  	*ctx = F2FS_SUPER_MAGIC;
  
  	err = crypto_shash_update(shash, address, length);
  	BUG_ON(err);
  
  	return *ctx;
  }
  
  static inline bool f2fs_crc_valid(struct f2fs_sb_info *sbi, __u32 blk_crc,
  				  void *buf, size_t buf_size)
  {
  	return f2fs_crc32(sbi, buf, buf_size) == blk_crc;
  }

  static inline struct f2fs_inode_info *F2FS_I(struct inode *inode)
  {
  	return container_of(inode, struct f2fs_inode_info, vfs_inode);
  }
  
  static inline struct f2fs_sb_info *F2FS_SB(struct super_block *sb)
  {
  	return sb->s_fs_info;
  }

  static inline struct f2fs_sb_info *F2FS_I_SB(struct inode *inode)
  {
  	return F2FS_SB(inode->i_sb);
  }
  
  static inline struct f2fs_sb_info *F2FS_M_SB(struct address_space *mapping)
  {
  	return F2FS_I_SB(mapping->host);
  }
  
  static inline struct f2fs_sb_info *F2FS_P_SB(struct page *page)
  {
  	return F2FS_M_SB(page->mapping);
  }

  static inline struct f2fs_super_block *F2FS_RAW_SUPER(struct f2fs_sb_info *sbi)
  {
  	return (struct f2fs_super_block *)(sbi->raw_super);
  }
  
  static inline struct f2fs_checkpoint *F2FS_CKPT(struct f2fs_sb_info *sbi)
  {
  	return (struct f2fs_checkpoint *)(sbi->ckpt);
  }

  static inline struct f2fs_node *F2FS_NODE(struct page *page)
  {
  	return (struct f2fs_node *)page_address(page);
  }

  static inline struct f2fs_inode *F2FS_INODE(struct page *page)
  {
  	return &((struct f2fs_node *)page_address(page))->i;
  }

  static inline struct f2fs_nm_info *NM_I(struct f2fs_sb_info *sbi)
  {
  	return (struct f2fs_nm_info *)(sbi->nm_info);
  }
  
  static inline struct f2fs_sm_info *SM_I(struct f2fs_sb_info *sbi)
  {
  	return (struct f2fs_sm_info *)(sbi->sm_info);
  }
  
  static inline struct sit_info *SIT_I(struct f2fs_sb_info *sbi)
  {
  	return (struct sit_info *)(SM_I(sbi)->sit_info);
  }
  
  static inline struct free_segmap_info *FREE_I(struct f2fs_sb_info *sbi)
  {
  	return (struct free_segmap_info *)(SM_I(sbi)->free_info);
  }
  
  static inline struct dirty_seglist_info *DIRTY_I(struct f2fs_sb_info *sbi)
  {
  	return (struct dirty_seglist_info *)(SM_I(sbi)->dirty_info);
  }

  static inline struct address_space *META_MAPPING(struct f2fs_sb_info *sbi)
  {
  	return sbi->meta_inode->i_mapping;
  }

  static inline struct address_space *NODE_MAPPING(struct f2fs_sb_info *sbi)
  {
  	return sbi->node_inode->i_mapping;
  }

  static inline bool is_sbi_flag_set(struct f2fs_sb_info *sbi, unsigned int type)
  {

  	return test_bit(type, &sbi->s_flag);

  }
  
  static inline void set_sbi_flag(struct f2fs_sb_info *sbi, unsigned int type)

  {

  	set_bit(type, &sbi->s_flag);

  }

  static inline void clear_sbi_flag(struct f2fs_sb_info *sbi, unsigned int type)

  {

  	clear_bit(type, &sbi->s_flag);

  }

  static inline unsigned long long cur_cp_version(struct f2fs_checkpoint *cp)
  {
  	return le64_to_cpu(cp->checkpoint_ver);
  }

  static inline bool __is_set_ckpt_flags(struct f2fs_checkpoint *cp, unsigned int f)

  {
  	unsigned int ckpt_flags = le32_to_cpu(cp->ckpt_flags);

  	return ckpt_flags & f;
  }

  static inline bool is_set_ckpt_flags(struct f2fs_sb_info *sbi, unsigned int f)

  {

  	return __is_set_ckpt_flags(F2FS_CKPT(sbi), f);
  }
  
  static inline void __set_ckpt_flags(struct f2fs_checkpoint *cp, unsigned int f)
  {
  	unsigned int ckpt_flags;
  
  	ckpt_flags = le32_to_cpu(cp->ckpt_flags);

  	ckpt_flags |= f;
  	cp->ckpt_flags = cpu_to_le32(ckpt_flags);
  }

  static inline void set_ckpt_flags(struct f2fs_sb_info *sbi, unsigned int f)

  {

  	spin_lock(&sbi->cp_lock);
  	__set_ckpt_flags(F2FS_CKPT(sbi), f);
  	spin_unlock(&sbi->cp_lock);
  }
  
  static inline void __clear_ckpt_flags(struct f2fs_checkpoint *cp, unsigned int f)
  {
  	unsigned int ckpt_flags;
  
  	ckpt_flags = le32_to_cpu(cp->ckpt_flags);

  	ckpt_flags &= (~f);
  	cp->ckpt_flags = cpu_to_le32(ckpt_flags);
  }

  static inline void clear_ckpt_flags(struct f2fs_sb_info *sbi, unsigned int f)
  {
  	spin_lock(&sbi->cp_lock);
  	__clear_ckpt_flags(F2FS_CKPT(sbi), f);
  	spin_unlock(&sbi->cp_lock);
  }

  static inline bool f2fs_discard_en(struct f2fs_sb_info *sbi)
  {
  	struct request_queue *q = bdev_get_queue(sbi->sb->s_bdev);
  
  	return blk_queue_discard(q);
  }

  static inline void f2fs_lock_op(struct f2fs_sb_info *sbi)

  {

  	down_read(&sbi->cp_rwsem);

  }

  static inline void f2fs_unlock_op(struct f2fs_sb_info *sbi)

  {

  	up_read(&sbi->cp_rwsem);

  }

  static inline void f2fs_lock_all(struct f2fs_sb_info *sbi)

  {

  	down_write(&sbi->cp_rwsem);

  }

  static inline void f2fs_unlock_all(struct f2fs_sb_info *sbi)

  {

  	up_write(&sbi->cp_rwsem);

  }

  static inline int __get_cp_reason(struct f2fs_sb_info *sbi)
  {
  	int reason = CP_SYNC;
  
  	if (test_opt(sbi, FASTBOOT))
  		reason = CP_FASTBOOT;
  	if (is_sbi_flag_set(sbi, SBI_IS_CLOSE))
  		reason = CP_UMOUNT;
  	return reason;
  }
  
  static inline bool __remain_node_summaries(int reason)
  {
  	return (reason == CP_UMOUNT || reason == CP_FASTBOOT);
  }
  
  static inline bool __exist_node_summaries(struct f2fs_sb_info *sbi)
  {

  	return (is_set_ckpt_flags(sbi, CP_UMOUNT_FLAG) ||
  			is_set_ckpt_flags(sbi, CP_FASTBOOT_FLAG));

  }

  /*
   * Check whether the given nid is within node id range.
   */

  static inline int check_nid_range(struct f2fs_sb_info *sbi, nid_t nid)

  {

  	if (unlikely(nid < F2FS_ROOT_INO(sbi)))
  		return -EINVAL;

  	if (unlikely(nid >= NM_I(sbi)->max_nid))

  		return -EINVAL;
  	return 0;

  }
  
  #define F2FS_DEFAULT_ALLOCATED_BLOCKS	1
  
  /*
   * Check whether the inode has blocks or not
   */
  static inline int F2FS_HAS_BLOCKS(struct inode *inode)
  {
  	if (F2FS_I(inode)->i_xattr_nid)

  		return inode->i_blocks > F2FS_DEFAULT_ALLOCATED_BLOCKS + 1;

  	else

  		return inode->i_blocks > F2FS_DEFAULT_ALLOCATED_BLOCKS;

  }

  static inline bool f2fs_has_xattr_block(unsigned int ofs)
  {
  	return ofs == XATTR_NODE_OFFSET;
  }

  static inline void f2fs_i_blocks_write(struct inode *, blkcnt_t, bool);

  static inline bool inc_valid_block_count(struct f2fs_sb_info *sbi,

  				 struct inode *inode, blkcnt_t *count)

  {

  	blkcnt_t diff;

  #ifdef CONFIG_F2FS_FAULT_INJECTION

  	if (time_to_inject(sbi, FAULT_BLOCK))

  		return false;

  #endif

  	/*
  	 * let's increase this in prior to actual block count change in order
  	 * for f2fs_sync_file to avoid data races when deciding checkpoint.
  	 */
  	percpu_counter_add(&sbi->alloc_valid_block_count, (*count));

  	spin_lock(&sbi->stat_lock);
  	sbi->total_valid_block_count += (block_t)(*count);
  	if (unlikely(sbi->total_valid_block_count > sbi->user_block_count)) {

  		diff = sbi->total_valid_block_count - sbi->user_block_count;
  		*count -= diff;

  		sbi->total_valid_block_count = sbi->user_block_count;

  		if (!*count) {
  			spin_unlock(&sbi->stat_lock);

  			percpu_counter_sub(&sbi->alloc_valid_block_count, diff);

  			return false;
  		}

  	}

  	spin_unlock(&sbi->stat_lock);

  	f2fs_i_blocks_write(inode, *count, true);

  	return true;
  }

  static inline void dec_valid_block_count(struct f2fs_sb_info *sbi,

  						struct inode *inode,
  						blkcnt_t count)
  {
  	spin_lock(&sbi->stat_lock);

  	f2fs_bug_on(sbi, sbi->total_valid_block_count < (block_t) count);
  	f2fs_bug_on(sbi, inode->i_blocks < count);

  	sbi->total_valid_block_count -= (block_t)count;
  	spin_unlock(&sbi->stat_lock);

  	f2fs_i_blocks_write(inode, count, false);

  }
  
  static inline void inc_page_count(struct f2fs_sb_info *sbi, int count_type)
  {

  	atomic_inc(&sbi->nr_pages[count_type]);

  
  	if (count_type == F2FS_DIRTY_DATA || count_type == F2FS_INMEM_PAGES)
  		return;

  	set_sbi_flag(sbi, SBI_IS_DIRTY);

  }

  static inline void inode_inc_dirty_pages(struct inode *inode)

  {

  	atomic_inc(&F2FS_I(inode)->dirty_pages);

  	inc_page_count(F2FS_I_SB(inode), S_ISDIR(inode->i_mode) ?
  				F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA);

  }
  
  static inline void dec_page_count(struct f2fs_sb_info *sbi, int count_type)
  {

  	atomic_dec(&sbi->nr_pages[count_type]);

  }

  static inline void inode_dec_dirty_pages(struct inode *inode)

  {

  	if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) &&
  			!S_ISLNK(inode->i_mode))

  		return;

  	atomic_dec(&F2FS_I(inode)->dirty_pages);

  	dec_page_count(F2FS_I_SB(inode), S_ISDIR(inode->i_mode) ?
  				F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA);

  }

  static inline s64 get_pages(struct f2fs_sb_info *sbi, int count_type)

  {

  	return atomic_read(&sbi->nr_pages[count_type]);

  }

  static inline int get_dirty_pages(struct inode *inode)

  {

  	return atomic_read(&F2FS_I(inode)->dirty_pages);

  }

  static inline int get_blocktype_secs(struct f2fs_sb_info *sbi, int block_type)
  {

  	unsigned int pages_per_sec = sbi->segs_per_sec * sbi->blocks_per_seg;

  	unsigned int segs = (get_pages(sbi, block_type) + pages_per_sec - 1) >>
  						sbi->log_blocks_per_seg;
  
  	return segs / sbi->segs_per_sec;

  }

  static inline block_t valid_user_blocks(struct f2fs_sb_info *sbi)
  {

  	return sbi->total_valid_block_count;

  }

  static inline block_t discard_blocks(struct f2fs_sb_info *sbi)
  {
  	return sbi->discard_blks;
  }

  static inline unsigned long __bitmap_size(struct f2fs_sb_info *sbi, int flag)
  {
  	struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
  
  	/* return NAT or SIT bitmap */
  	if (flag == NAT_BITMAP)
  		return le32_to_cpu(ckpt->nat_ver_bitmap_bytesize);
  	else if (flag == SIT_BITMAP)
  		return le32_to_cpu(ckpt->sit_ver_bitmap_bytesize);
  
  	return 0;
  }

  static inline block_t __cp_payload(struct f2fs_sb_info *sbi)
  {
  	return le32_to_cpu(F2FS_RAW_SUPER(sbi)->cp_payload);
  }

  static inline void *__bitmap_ptr(struct f2fs_sb_info *sbi, int flag)
  {
  	struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);

  	int offset;

  	if (__cp_payload(sbi) > 0) {

  		if (flag == NAT_BITMAP)
  			return &ckpt->sit_nat_version_bitmap;
  		else

  			return (unsigned char *)ckpt + F2FS_BLKSIZE;

  	} else {
  		offset = (flag == NAT_BITMAP) ?

  			le32_to_cpu(ckpt->sit_ver_bitmap_bytesize) : 0;

  		return &ckpt->sit_nat_version_bitmap + offset;
  	}

  }
  
  static inline block_t __start_cp_addr(struct f2fs_sb_info *sbi)
  {

  	block_t start_addr = le32_to_cpu(F2FS_RAW_SUPER(sbi)->cp_blkaddr);

  	if (sbi->cur_cp_pack == 2)

  		start_addr += sbi->blocks_per_seg;

  	return start_addr;
  }

  static inline block_t __start_cp_next_addr(struct f2fs_sb_info *sbi)
  {
  	block_t start_addr = le32_to_cpu(F2FS_RAW_SUPER(sbi)->cp_blkaddr);
  
  	if (sbi->cur_cp_pack == 1)
  		start_addr += sbi->blocks_per_seg;

  	return start_addr;
  }

  static inline void __set_cp_next_pack(struct f2fs_sb_info *sbi)
  {
  	sbi->cur_cp_pack = (sbi->cur_cp_pack == 1) ? 2 : 1;
  }

  static inline block_t __start_sum_addr(struct f2fs_sb_info *sbi)
  {
  	return le32_to_cpu(F2FS_CKPT(sbi)->cp_pack_start_sum);
  }
  
  static inline bool inc_valid_node_count(struct f2fs_sb_info *sbi,

  						struct inode *inode)

  {
  	block_t	valid_block_count;
  	unsigned int valid_node_count;
  
  	spin_lock(&sbi->stat_lock);

  	valid_block_count = sbi->total_valid_block_count + 1;

  	if (unlikely(valid_block_count > sbi->user_block_count)) {

  		spin_unlock(&sbi->stat_lock);
  		return false;
  	}

  	valid_node_count = sbi->total_valid_node_count + 1;

  	if (unlikely(valid_node_count > sbi->total_node_count)) {

  		spin_unlock(&sbi->stat_lock);
  		return false;
  	}
  
  	if (inode)

  		f2fs_i_blocks_write(inode, 1, true);

  	sbi->total_valid_node_count++;
  	sbi->total_valid_block_count++;

  	spin_unlock(&sbi->stat_lock);

  	percpu_counter_inc(&sbi->alloc_valid_block_count);

  	return true;
  }
  
  static inline void dec_valid_node_count(struct f2fs_sb_info *sbi,

  						struct inode *inode)

  {
  	spin_lock(&sbi->stat_lock);

  	f2fs_bug_on(sbi, !sbi->total_valid_block_count);
  	f2fs_bug_on(sbi, !sbi->total_valid_node_count);
  	f2fs_bug_on(sbi, !inode->i_blocks);

  	f2fs_i_blocks_write(inode, 1, false);

  	sbi->total_valid_node_count--;
  	sbi->total_valid_block_count--;

  
  	spin_unlock(&sbi->stat_lock);
  }
  
  static inline unsigned int valid_node_count(struct f2fs_sb_info *sbi)
  {

  	return sbi->total_valid_node_count;

  }
  
  static inline void inc_valid_inode_count(struct f2fs_sb_info *sbi)
  {

  	percpu_counter_inc(&sbi->total_valid_inode_count);

  }

  static inline void dec_valid_inode_count(struct f2fs_sb_info *sbi)

  {

  	percpu_counter_dec(&sbi->total_valid_inode_count);

  }

  static inline s64 valid_inode_count(struct f2fs_sb_info *sbi)

  {

  	return percpu_counter_sum_positive(&sbi->total_valid_inode_count);

  }

  static inline struct page *f2fs_grab_cache_page(struct address_space *mapping,
  						pgoff_t index, bool for_write)
  {

  #ifdef CONFIG_F2FS_FAULT_INJECTION
  	struct page *page = find_lock_page(mapping, index);
  	if (page)
  		return page;

  	if (time_to_inject(F2FS_M_SB(mapping), FAULT_PAGE_ALLOC))

  		return NULL;
  #endif

  	if (!for_write)
  		return grab_cache_page(mapping, index);
  	return grab_cache_page_write_begin(mapping, index, AOP_FLAG_NOFS);
  }

  static inline void f2fs_copy_page(struct page *src, struct page *dst)
  {
  	char *src_kaddr = kmap(src);
  	char *dst_kaddr = kmap(dst);
  
  	memcpy(dst_kaddr, src_kaddr, PAGE_SIZE);
  	kunmap(dst);
  	kunmap(src);
  }

  static inline void f2fs_put_page(struct page *page, int unlock)
  {

  	if (!page)

  		return;
  
  	if (unlock) {

  		f2fs_bug_on(F2FS_P_SB(page), !PageLocked(page));

  		unlock_page(page);
  	}

  	put_page(page);

  }
  
  static inline void f2fs_put_dnode(struct dnode_of_data *dn)
  {
  	if (dn->node_page)
  		f2fs_put_page(dn->node_page, 1);
  	if (dn->inode_page && dn->node_page != dn->inode_page)
  		f2fs_put_page(dn->inode_page, 0);
  	dn->node_page = NULL;
  	dn->inode_page = NULL;
  }
  
  static inline struct kmem_cache *f2fs_kmem_cache_create(const char *name,

  					size_t size)

  {

  	return kmem_cache_create(name, size, 0, SLAB_RECLAIM_ACCOUNT, NULL);

  }

  static inline void *f2fs_kmem_cache_alloc(struct kmem_cache *cachep,
  						gfp_t flags)
  {
  	void *entry;

  	entry = kmem_cache_alloc(cachep, flags);
  	if (!entry)
  		entry = kmem_cache_alloc(cachep, flags | __GFP_NOFAIL);

  	return entry;
  }

  static inline struct bio *f2fs_bio_alloc(int npages)
  {
  	struct bio *bio;
  
  	/* No failure on bio allocation */

  	bio = bio_alloc(GFP_NOIO, npages);

  	if (!bio)
  		bio = bio_alloc(GFP_NOIO | __GFP_NOFAIL, npages);

  	return bio;
  }

  static inline void f2fs_radix_tree_insert(struct radix_tree_root *root,
  				unsigned long index, void *item)
  {
  	while (radix_tree_insert(root, index, item))
  		cond_resched();
  }

  #define RAW_IS_INODE(p)	((p)->footer.nid == (p)->footer.ino)
  
  static inline bool IS_INODE(struct page *page)
  {

  	struct f2fs_node *p = F2FS_NODE(page);

  	return RAW_IS_INODE(p);
  }
  
  static inline __le32 *blkaddr_in_node(struct f2fs_node *node)
  {
  	return RAW_IS_INODE(node) ? node->i.i_addr : node->dn.addr;
  }
  
  static inline block_t datablock_addr(struct page *node_page,
  		unsigned int offset)
  {
  	struct f2fs_node *raw_node;
  	__le32 *addr_array;

  	raw_node = F2FS_NODE(node_page);

  	addr_array = blkaddr_in_node(raw_node);
  	return le32_to_cpu(addr_array[offset]);
  }
  
  static inline int f2fs_test_bit(unsigned int nr, char *addr)
  {
  	int mask;
  
  	addr += (nr >> 3);
  	mask = 1 << (7 - (nr & 0x07));
  	return mask & *addr;
  }

  static inline void f2fs_set_bit(unsigned int nr, char *addr)
  {
  	int mask;
  
  	addr += (nr >> 3);
  	mask = 1 << (7 - (nr & 0x07));
  	*addr |= mask;
  }
  
  static inline void f2fs_clear_bit(unsigned int nr, char *addr)
  {
  	int mask;
  
  	addr += (nr >> 3);
  	mask = 1 << (7 - (nr & 0x07));
  	*addr &= ~mask;
  }

  static inline int f2fs_test_and_set_bit(unsigned int nr, char *addr)

  {
  	int mask;
  	int ret;
  
  	addr += (nr >> 3);
  	mask = 1 << (7 - (nr & 0x07));
  	ret = mask & *addr;
  	*addr |= mask;
  	return ret;
  }

  static inline int f2fs_test_and_clear_bit(unsigned int nr, char *addr)

  {
  	int mask;
  	int ret;
  
  	addr += (nr >> 3);
  	mask = 1 << (7 - (nr & 0x07));
  	ret = mask & *addr;
  	*addr &= ~mask;
  	return ret;
  }

  static inline void f2fs_change_bit(unsigned int nr, char *addr)
  {
  	int mask;
  
  	addr += (nr >> 3);
  	mask = 1 << (7 - (nr & 0x07));
  	*addr ^= mask;
  }

  /* used for f2fs_inode_info->flags */
  enum {
  	FI_NEW_INODE,		/* indicate newly allocated inode */

  	FI_DIRTY_INODE,		/* indicate inode is dirty or not */

  	FI_AUTO_RECOVER,	/* indicate inode is recoverable */

  	FI_DIRTY_DIR,		/* indicate directory has dirty pages */

  	FI_INC_LINK,		/* need to increment i_nlink */
  	FI_ACL_MODE,		/* indicate acl mode */
  	FI_NO_ALLOC,		/* should not allocate any blocks */

  	FI_FREE_NID,		/* free allocated nide */

  	FI_NO_EXTENT,		/* not to use the extent cache */

  	FI_INLINE_XATTR,	/* used for inline xattr */

  	FI_INLINE_DATA,		/* used for inline data*/

  	FI_INLINE_DENTRY,	/* used for inline dentry */

  	FI_APPEND_WRITE,	/* inode has appended data */
  	FI_UPDATE_WRITE,	/* inode has in-place-update data */

  	FI_NEED_IPU,		/* used for ipu per file */
  	FI_ATOMIC_FILE,		/* indicate atomic file */

  	FI_VOLATILE_FILE,	/* indicate volatile file */

  	FI_FIRST_BLOCK_WRITTEN,	/* indicate #0 data block was written */

  	FI_DROP_CACHE,		/* drop dirty page cache */

  	FI_DATA_EXIST,		/* indicate data exists */

  	FI_INLINE_DOTS,		/* indicate inline dot dentries */

  	FI_DO_DEFRAG,		/* indicate defragment is running */

  	FI_DIRTY_FILE,		/* indicate regular/symlink has dirty pages */

  };

  static inline void __mark_inode_dirty_flag(struct inode *inode,
  						int flag, bool set)
  {
  	switch (flag) {
  	case FI_INLINE_XATTR:
  	case FI_INLINE_DATA:
  	case FI_INLINE_DENTRY:
  		if (set)
  			return;
  	case FI_DATA_EXIST:
  	case FI_INLINE_DOTS:

  		f2fs_mark_inode_dirty_sync(inode);

  	}
  }

  static inline void set_inode_flag(struct inode *inode, int flag)

  {

  	if (!test_bit(flag, &F2FS_I(inode)->flags))
  		set_bit(flag, &F2FS_I(inode)->flags);

  	__mark_inode_dirty_flag(inode, flag, true);

  }

  static inline int is_inode_flag_set(struct inode *inode, int flag)

  {

  	return test_bit(flag, &F2FS_I(inode)->flags);

  }

  static inline void clear_inode_flag(struct inode *inode, int flag)

  {

  	if (test_bit(flag, &F2FS_I(inode)->flags))
  		clear_bit(flag, &F2FS_I(inode)->flags);

  	__mark_inode_dirty_flag(inode, flag, false);

  }

  static inline void set_acl_inode(struct inode *inode, umode_t mode)

  {

  	F2FS_I(inode)->i_acl_mode = mode;
  	set_inode_flag(inode, FI_ACL_MODE);

  	f2fs_mark_inode_dirty_sync(inode);

  }

  static inline void f2fs_i_links_write(struct inode *inode, bool inc)

  {

  	if (inc)
  		inc_nlink(inode);
  	else
  		drop_nlink(inode);

  	f2fs_mark_inode_dirty_sync(inode);

  }

  static inline void f2fs_i_blocks_write(struct inode *inode,
  					blkcnt_t diff, bool add)
  {

  	bool clean = !is_inode_flag_set(inode, FI_DIRTY_INODE);
  	bool recover = is_inode_flag_set(inode, FI_AUTO_RECOVER);

  	inode->i_blocks = add ? inode->i_blocks + diff :
  				inode->i_blocks - diff;

  	f2fs_mark_inode_dirty_sync(inode);

  	if (clean || recover)
  		set_inode_flag(inode, FI_AUTO_RECOVER);

  }

  static inline void f2fs_i_size_write(struct inode *inode, loff_t i_size)
  {

  	bool clean = !is_inode_flag_set(inode, FI_DIRTY_INODE);
  	bool recover = is_inode_flag_set(inode, FI_AUTO_RECOVER);

  	if (i_size_read(inode) == i_size)
  		return;
  
  	i_size_write(inode, i_size);

  	f2fs_mark_inode_dirty_sync(inode);

  	if (clean || recover)
  		set_inode_flag(inode, FI_AUTO_RECOVER);

  }

  static inline bool f2fs_skip_inode_update(struct inode *inode)

  {

  	if (!is_inode_flag_set(inode, FI_AUTO_RECOVER))
  		return false;
  	return F2FS_I(inode)->last_disk_size == i_size_read(inode);

  }

  static inline void f2fs_i_depth_write(struct inode *inode, unsigned int depth)

  {

  	F2FS_I(inode)->i_current_depth = depth;

  	f2fs_mark_inode_dirty_sync(inode);

  }

  static inline void f2fs_i_xnid_write(struct inode *inode, nid_t xnid)

  {

  	F2FS_I(inode)->i_xattr_nid = xnid;

  	f2fs_mark_inode_dirty_sync(inode);

  }
  
  static inline void f2fs_i_pino_write(struct inode *inode, nid_t pino)
  {
  	F2FS_I(inode)->i_pino = pino;

  	f2fs_mark_inode_dirty_sync(inode);

  }

  static inline void get_inline_info(struct inode *inode, struct f2fs_inode *ri)

  {

  	struct f2fs_inode_info *fi = F2FS_I(inode);