f2fs: shrink extent_cache entries

[mirror_ubuntu-artful-kernel.git] / fs / f2fs / f2fs.h

/*
 * 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>

#ifdef CONFIG_F2FS_CHECK_FS
#define f2fs_bug_on(sbi, condition)     BUG_ON(condition)
#define f2fs_down_write(x, y)   down_write_nest_lock(x, y)
#else
#define f2fs_bug_on(sbi, condition)                                     \
        do {                                                            \
                if (unlikely(condition)) {                              \
                        WARN_ON(1);                                     \
                        set_sbi_flag(sbi, SBI_NEED_FSCK);               \
                }                                                       \
        } while (0)
#define f2fs_down_write(x, y)   down_write(x)
#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 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_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)

#define CRCPOLY_LE 0xedb88320

static inline __u32 f2fs_crc32(void *buf, size_t len)
{
        unsigned char *p = (unsigned char *)buf;
        __u32 crc = F2FS_SUPER_MAGIC;
        int i;

        while (len--) {
                crc ^= *p++;
                for (i = 0; i < 8; i++)
                        crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0);
        }
        return crc;
}

static inline bool f2fs_crc_valid(__u32 blk_crc, void *buf, size_t buf_size)
{
        return f2fs_crc32(buf, buf_size) == blk_crc;
}

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

enum {
        CP_UMOUNT,
        CP_FASTBOOT,
        CP_SYNC,
        CP_RECOVERY,
        CP_DISCARD,
};

#define DEF_BATCHED_TRIM_SECTIONS       32
#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)

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 directory inodes or gc inodes.
 * NOTE: there are two slab users for this structure, if we add/modify/delete
 * fields in structure for one of slab users, it may affect fields or size of
 * other one, in this condition, it's better to split both of slab and related
 * data structure.
 */
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 */
};

/* 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 */
        block_t last_inode;     /* block address locating the last inode */
};

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

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

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

static inline int update_nats_in_cursum(struct f2fs_summary_block *rs, int i)
{
        int before = nats_in_cursum(rs);
        rs->n_nats = cpu_to_le16(before + i);
        return before;
}

static inline int update_sits_in_cursum(struct f2fs_summary_block *rs, int i)
{
        int before = sits_in_cursum(rs);
        rs->n_sits = cpu_to_le16(before + i);
        return before;
}

static inline bool __has_cursum_space(struct f2fs_summary_block *sum, int size,
                                                                int type)
{
        if (type == NAT_JOURNAL)
                return size <= MAX_NAT_JENTRIES(sum);
        return size <= MAX_SIT_JENTRIES(sum);
}

/*
 * 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_SET_ENCRYPTION_POLICY                                  \
                _IOR('f', 19, struct f2fs_encryption_policy)
#define F2FS_IOC_GET_ENCRYPTION_PWSALT                                  \
                _IOW('f', 20, __u8[16])
#define F2FS_IOC_GET_ENCRYPTION_POLICY                                  \
                _IOW('f', 21, struct f2fs_encryption_policy)

/*
 * 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 */

#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
#endif

/*
 * For INODE and NODE manager
 */
/* for directory operations */
struct f2fs_str {
        unsigned char *name;
        u32 len;
};

struct f2fs_filename {
        const struct qstr *usr_fname;
        struct f2fs_str disk_name;
        f2fs_hash_t hash;
#ifdef CONFIG_F2FS_FS_ENCRYPTION
        struct f2fs_str crypto_buf;
#endif
};

#define FSTR_INIT(n, l)         { .name = n, .len = l }
#define FSTR_TO_QSTR(f)         QSTR_INIT((f)->name, (f)->len)
#define fname_name(p)           ((p)->disk_name.name)
#define fname_len(p)            ((p)->disk_name.len)

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           32000   /* 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 {
        nid_t ino;                      /* inode number */
        struct rb_root root;            /* root of extent info rb-tree */
        struct extent_node *cached_en;  /* recently accessed extent node */
        rwlock_t lock;                  /* protect extent info rb-tree */
        atomic_t refcount;              /* reference count of rb-tree */
        unsigned int count;             /* # 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;
};

/*
 * 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)

/* Encryption algorithms */
#define F2FS_ENCRYPTION_MODE_INVALID            0
#define F2FS_ENCRYPTION_MODE_AES_256_XTS        1
#define F2FS_ENCRYPTION_MODE_AES_256_GCM        2
#define F2FS_ENCRYPTION_MODE_AES_256_CBC        3
#define F2FS_ENCRYPTION_MODE_AES_256_CTS        4

#include "f2fs_crypto.h"

#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 */
        struct extent_info ext;         /* in-memory extent cache entry */
        rwlock_t ext_lock;              /* rwlock for single extent cache */
        struct inode_entry *dirty_dir;  /* the pointer of dirty dir */

        struct radix_tree_root inmem_root;      /* radix tree for inmem pages */
        struct list_head inmem_pages;   /* inmemory pages managed by f2fs */
        struct mutex inmem_lock;        /* lock for inmemory pages */

#ifdef CONFIG_F2FS_FS_ENCRYPTION
        /* Encryption params */
        struct f2fs_crypt_info *i_crypt_info;
#endif
};

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);
}

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 */

        /* 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 */
        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 */
        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 */
        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_WRITEBACK,
        F2FS_DIRTY_DENTS,
        F2FS_DIRTY_NODES,
        F2FS_DIRTY_META,
        F2FS_INMEM_PAGES,
        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,
        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 rw;                 /* contains R/RS/W/WS with REQ_META/REQ_PRIO */
        block_t blk_addr;       /* block address to be written */
        struct page *page;      /* page to be written */
        struct page *encrypted_page;    /* encrypted page */
};

#define is_read_io(rw)  (((rw) & 1) == 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 */
};

/* 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 */
};

struct f2fs_sb_info {
        struct super_block *sb;                 /* pointer to VFS super block */
        struct proc_dir_entry *s_proc;          /* proc entry */
        struct buffer_head *raw_super_buf;      /* buffer head of raw sb */
        struct f2fs_super_block *raw_super;     /* raw super block pointer */
        int s_flag;                             /* flags for sbi */

        /* 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 */

        /* for checkpoint */
        struct f2fs_checkpoint *ckpt;           /* raw checkpoint pointer */
        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 */
        struct mutex writepages;                /* mutex for writepages() */
        wait_queue_head_t cp_wait;

        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 directory inode management */
        struct list_head dir_inode_list;        /* dir inode list */
        spinlock_t dir_inode_lock;              /* for dir 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 */
        int total_ext_tree;                     /* extent 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 */
        unsigned int total_valid_inode_count;   /* valid inode count */
        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 alloc_valid_block_count;        /* # of allocated 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_pages[NR_COUNT_TYPE];       /* # of pages, see count_type */

        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 */
        int total_hit_ext, read_hit_ext;        /* extent cache hit ratio */
        atomic_t inline_inode;                  /* # of inline_data inodes */
        atomic_t inline_dir;                    /* # of inline_dentry inodes */
        int bg_gc;                              /* background gc calls */
        unsigned int n_dirty_dirs;              /* # of dir 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;
};

/*
 * Inline functions
 */
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 sbi->s_flag & (0x01 << type);
}

static inline void set_sbi_flag(struct f2fs_sb_info *sbi, unsigned int type)
{
        sbi->s_flag |= (0x01 << type);
}

static inline void clear_sbi_flag(struct f2fs_sb_info *sbi, unsigned int type)
{
        sbi->s_flag &= ~(0x01 << type);
}

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 void set_ckpt_flags(struct f2fs_checkpoint *cp, unsigned int f)
{
        unsigned int 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_checkpoint *cp, unsigned int f)
{
        unsigned int ckpt_flags = le32_to_cpu(cp->ckpt_flags);
        ckpt_flags &= (~f);
        cp->ckpt_flags = cpu_to_le32(ckpt_flags);
}

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)
{
        f2fs_down_write(&sbi->cp_rwsem, &sbi->cp_mutex);
}

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(F2FS_CKPT(sbi), CP_UMOUNT_FLAG) ||
                        is_set_ckpt_flags(F2FS_CKPT(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 bool inc_valid_block_count(struct f2fs_sb_info *sbi,
                                 struct inode *inode, blkcnt_t count)
{
        block_t valid_block_count;

        spin_lock(&sbi->stat_lock);
        valid_block_count =
                sbi->total_valid_block_count + (block_t)count;
        if (unlikely(valid_block_count > sbi->user_block_count)) {
                spin_unlock(&sbi->stat_lock);
                return false;
        }
        inode->i_blocks += count;
        sbi->total_valid_block_count = valid_block_count;
        sbi->alloc_valid_block_count += (block_t)count;
        spin_unlock(&sbi->stat_lock);
        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);
        inode->i_blocks -= count;
        sbi->total_valid_block_count -= (block_t)count;
        spin_unlock(&sbi->stat_lock);
}

static inline void inc_page_count(struct f2fs_sb_info *sbi, int count_type)
{
        atomic_inc(&sbi->nr_pages[count_type]);
        set_sbi_flag(sbi, SBI_IS_DIRTY);
}

static inline void inode_inc_dirty_pages(struct inode *inode)
{
        atomic_inc(&F2FS_I(inode)->dirty_pages);
        if (S_ISDIR(inode->i_mode))
                inc_page_count(F2FS_I_SB(inode), F2FS_DIRTY_DENTS);
}

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);

        if (S_ISDIR(inode->i_mode))
                dec_page_count(F2FS_I_SB(inode), F2FS_DIRTY_DENTS);
}

static inline int 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 *
                                        (1 << sbi->log_blocks_per_seg);
        return ((get_pages(sbi, block_type) + pages_per_sec - 1)
                        >> sbi->log_blocks_per_seg) / sbi->segs_per_sec;
}

static inline block_t valid_user_blocks(struct f2fs_sb_info *sbi)
{
        return sbi->total_valid_block_count;
}

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;
        struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
        unsigned long long ckpt_version = cur_cp_version(ckpt);

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

        /*
         * odd numbered checkpoint should at cp segment 0
         * and even segment must be at cp segment 1
         */
        if (!(ckpt_version & 1))
                start_addr += sbi->blocks_per_seg;

        return start_addr;
}

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)
                inode->i_blocks++;

        sbi->alloc_valid_block_count++;
        sbi->total_valid_node_count++;
        sbi->total_valid_block_count++;
        spin_unlock(&sbi->stat_lock);

        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);

        inode->i_blocks--;
        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)
{
        spin_lock(&sbi->stat_lock);
        f2fs_bug_on(sbi, sbi->total_valid_inode_count == sbi->total_node_count);
        sbi->total_valid_inode_count++;
        spin_unlock(&sbi->stat_lock);
}

static inline void dec_valid_inode_count(struct f2fs_sb_info *sbi)
{
        spin_lock(&sbi->stat_lock);
        f2fs_bug_on(sbi, !sbi->total_valid_inode_count);
        sbi->total_valid_inode_count--;
        spin_unlock(&sbi->stat_lock);
}

static inline unsigned int valid_inode_count(struct f2fs_sb_info *sbi)
{
        return sbi->total_valid_inode_count;
}

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);
        }
        page_cache_release(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;
retry:
        entry = kmem_cache_alloc(cachep, flags);
        if (!entry) {
                cond_resched();
                goto retry;
        }

        return entry;
}

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_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_UPDATE_DIR,          /* should update inode block for consistency */
        FI_DELAY_IPUT,          /* used for the recovery */
        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 */
};

static inline void set_inode_flag(struct f2fs_inode_info *fi, int flag)
{
        if (!test_bit(flag, &fi->flags))
                set_bit(flag, &fi->flags);
}

static inline int is_inode_flag_set(struct f2fs_inode_info *fi, int flag)
{
        return test_bit(flag, &fi->flags);
}

static inline void clear_inode_flag(struct f2fs_inode_info *fi, int flag)
{
        if (test_bit(flag, &fi->flags))
                clear_bit(flag, &fi->flags);
}

static inline void set_acl_inode(struct f2fs_inode_info *fi, umode_t mode)
{
        fi->i_acl_mode = mode;
        set_inode_flag(fi, FI_ACL_MODE);
}

static inline void get_inline_info(struct f2fs_inode_info *fi,
                                        struct f2fs_inode *ri)
{
        if (ri->i_inline & F2FS_INLINE_XATTR)
                set_inode_flag(fi, FI_INLINE_XATTR);
        if (ri->i_inline & F2FS_INLINE_DATA)
                set_inode_flag(fi, FI_INLINE_DATA);
        if (ri->i_inline & F2FS_INLINE_DENTRY)
                set_inode_flag(fi, FI_INLINE_DENTRY);
        if (ri->i_inline & F2FS_DATA_EXIST)
                set_inode_flag(fi, FI_DATA_EXIST);
        if (ri->i_inline & F2FS_INLINE_DOTS)
                set_inode_flag(fi, FI_INLINE_DOTS);
}

static inline void set_raw_inline(struct f2fs_inode_info *fi,
                                        struct f2fs_inode *ri)
{
        ri->i_inline = 0;

        if (is_inode_flag_set(fi, FI_INLINE_XATTR))
                ri->i_inline |= F2FS_INLINE_XATTR;
        if (is_inode_flag_set(fi, FI_INLINE_DATA))
                ri->i_inline |= F2FS_INLINE_DATA;
        if (is_inode_flag_set(fi, FI_INLINE_DENTRY))
                ri->i_inline |= F2FS_INLINE_DENTRY;
        if (is_inode_flag_set(fi, FI_DATA_EXIST))
                ri->i_inline |= F2FS_DATA_EXIST;
        if (is_inode_flag_set(fi, FI_INLINE_DOTS))
                ri->i_inline |= F2FS_INLINE_DOTS;
}

static inline int f2fs_has_inline_xattr(struct inode *inode)
{
        return is_inode_flag_set(F2FS_I(inode), FI_INLINE_XATTR);
}

static inline unsigned int addrs_per_inode(struct f2fs_inode_info *fi)
{
        if (f2fs_has_inline_xattr(&fi->vfs_inode))
                return DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS;
        return DEF_ADDRS_PER_INODE;
}

static inline void *inline_xattr_addr(struct page *page)
{
        struct f2fs_inode *ri = F2FS_INODE(page);
        return (void *)&(ri->i_addr[DEF_ADDRS_PER_INODE -
                                        F2FS_INLINE_XATTR_ADDRS]);
}

static inline int inline_xattr_size(struct inode *inode)
{
        if (f2fs_has_inline_xattr(inode))
                return F2FS_INLINE_XATTR_ADDRS << 2;
        else
                return 0;
}

static inline int f2fs_has_inline_data(struct inode *inode)
{
        return is_inode_flag_set(F2FS_I(inode), FI_INLINE_DATA);
}

static inline void f2fs_clear_inline_inode(struct inode *inode)
{
        clear_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
        clear_inode_flag(F2FS_I(inode), FI_DATA_EXIST);
}

static inline int f2fs_exist_data(struct inode *inode)
{
        return is_inode_flag_set(F2FS_I(inode), FI_DATA_EXIST);
}

static inline int f2fs_has_inline_dots(struct inode *inode)
{
        return is_inode_flag_set(F2FS_I(inode), FI_INLINE_DOTS);
}

static inline bool f2fs_is_atomic_file(struct inode *inode)
{
        return is_inode_flag_set(F2FS_I(inode), FI_ATOMIC_FILE);
}

static inline bool f2fs_is_volatile_file(struct inode *inode)
{
        return is_inode_flag_set(F2FS_I(inode), FI_VOLATILE_FILE);
}

static inline bool f2fs_is_first_block_written(struct inode *inode)
{
        return is_inode_flag_set(F2FS_I(inode), FI_FIRST_BLOCK_WRITTEN);
}

static inline bool f2fs_is_drop_cache(struct inode *inode)
{
        return is_inode_flag_set(F2FS_I(inode), FI_DROP_CACHE);
}

static inline void *inline_data_addr(struct page *page)
{
        struct f2fs_inode *ri = F2FS_INODE(page);
        return (void *)&(ri->i_addr[1]);
}

static inline int f2fs_has_inline_dentry(struct inode *inode)
{
        return is_inode_flag_set(F2FS_I(inode), FI_INLINE_DENTRY);
}

static inline void f2fs_dentry_kunmap(struct inode *dir, struct page *page)
{
        if (!f2fs_has_inline_dentry(dir))
                kunmap(page);
}

static inline int is_file(struct inode *inode, int type)
{
        return F2FS_I(inode)->i_advise & type;
}

static inline void set_file(struct inode *inode, int type)
{
        F2FS_I(inode)->i_advise |= type;
}

static inline void clear_file(struct inode *inode, int type)
{
        F2FS_I(inode)->i_advise &= ~type;
}

static inline int f2fs_readonly(struct super_block *sb)
{
        return sb->s_flags & MS_RDONLY;
}

static inline bool f2fs_cp_error(struct f2fs_sb_info *sbi)
{
        return is_set_ckpt_flags(sbi->ckpt, CP_ERROR_FLAG);
}

static inline void f2fs_stop_checkpoint(struct f2fs_sb_info *sbi)
{
        set_ckpt_flags(sbi->ckpt, CP_ERROR_FLAG);
        sbi->sb->s_flags |= MS_RDONLY;
}

static inline bool is_dot_dotdot(const struct qstr *str)
{
        if (str->len == 1 && str->name[0] == '.')
                return true;

        if (str->len == 2 && str->name[0] == '.' && str->name[1] == '.')
                return true;

        return false;
}

#define get_inode_mode(i) \
        ((is_inode_flag_set(F2FS_I(i), FI_ACL_MODE)) ? \
         (F2FS_I(i)->i_acl_mode) : ((i)->i_mode))

/* get offset of first page in next direct node */
#define PGOFS_OF_NEXT_DNODE(pgofs, fi)                          \
        ((pgofs < ADDRS_PER_INODE(fi)) ? ADDRS_PER_INODE(fi) :  \
        (pgofs - ADDRS_PER_INODE(fi) + ADDRS_PER_BLOCK) /       \
        ADDRS_PER_BLOCK * ADDRS_PER_BLOCK + ADDRS_PER_INODE(fi))

/*
 * file.c
 */
int f2fs_sync_file(struct file *, loff_t, loff_t, int);
void truncate_data_blocks(struct dnode_of_data *);
int truncate_blocks(struct inode *, u64, bool);
void f2fs_truncate(struct inode *);
int f2fs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
int f2fs_setattr(struct dentry *, struct iattr *);
int truncate_hole(struct inode *, pgoff_t, pgoff_t);
int truncate_data_blocks_range(struct dnode_of_data *, int);
long f2fs_ioctl(struct file *, unsigned int, unsigned long);
long f2fs_compat_ioctl(struct file *, unsigned int, unsigned long);

/*
 * inode.c
 */
void f2fs_set_inode_flags(struct inode *);
struct inode *f2fs_iget(struct super_block *, unsigned long);
int try_to_free_nats(struct f2fs_sb_info *, int);
void update_inode(struct inode *, struct page *);
void update_inode_page(struct inode *);
int f2fs_write_inode(struct inode *, struct writeback_control *);
void f2fs_evict_inode(struct inode *);
void handle_failed_inode(struct inode *);

/*
 * namei.c
 */
struct dentry *f2fs_get_parent(struct dentry *child);

/*
 * dir.c
 */
extern unsigned char f2fs_filetype_table[F2FS_FT_MAX];
void set_de_type(struct f2fs_dir_entry *, umode_t);

struct f2fs_dir_entry *find_target_dentry(struct f2fs_filename *,
                        f2fs_hash_t, int *, struct f2fs_dentry_ptr *);
bool f2fs_fill_dentries(struct dir_context *, struct f2fs_dentry_ptr *,
                        unsigned int, struct f2fs_str *);
void do_make_empty_dir(struct inode *, struct inode *,
                        struct f2fs_dentry_ptr *);
struct page *init_inode_metadata(struct inode *, struct inode *,
                        const struct qstr *, struct page *);
void update_parent_metadata(struct inode *, struct inode *, unsigned int);
int room_for_filename(const void *, int, int);
void f2fs_drop_nlink(struct inode *, struct inode *, struct page *);
struct f2fs_dir_entry *f2fs_find_entry(struct inode *, struct qstr *,
                                                        struct page **);
struct f2fs_dir_entry *f2fs_parent_dir(struct inode *, struct page **);
ino_t f2fs_inode_by_name(struct inode *, struct qstr *);
void f2fs_set_link(struct inode *, struct f2fs_dir_entry *,
                                struct page *, struct inode *);
int update_dent_inode(struct inode *, struct inode *, const struct qstr *);
void f2fs_update_dentry(nid_t ino, umode_t mode, struct f2fs_dentry_ptr *,
                        const struct qstr *, f2fs_hash_t , unsigned int);
int __f2fs_add_link(struct inode *, const struct qstr *, struct inode *, nid_t,
                        umode_t);
void f2fs_delete_entry(struct f2fs_dir_entry *, struct page *, struct inode *,
                                                        struct inode *);
int f2fs_do_tmpfile(struct inode *, struct inode *);
bool f2fs_empty_dir(struct inode *);

static inline int f2fs_add_link(struct dentry *dentry, struct inode *inode)
{
        return __f2fs_add_link(d_inode(dentry->d_parent), &dentry->d_name,
                                inode, inode->i_ino, inode->i_mode);
}

/*
 * super.c
 */
int f2fs_commit_super(struct f2fs_sb_info *, bool);
int f2fs_sync_fs(struct super_block *, int);
extern __printf(3, 4)
void f2fs_msg(struct super_block *, const char *, const char *, ...);

/*
 * hash.c
 */
f2fs_hash_t f2fs_dentry_hash(const struct qstr *);

/*
 * node.c
 */
struct dnode_of_data;
struct node_info;

bool available_free_memory(struct f2fs_sb_info *, int);
int need_dentry_mark(struct f2fs_sb_info *, nid_t);
bool is_checkpointed_node(struct f2fs_sb_info *, nid_t);
bool need_inode_block_update(struct f2fs_sb_info *, nid_t);
void get_node_info(struct f2fs_sb_info *, nid_t, struct node_info *);
int get_dnode_of_data(struct dnode_of_data *, pgoff_t, int);
int truncate_inode_blocks(struct inode *, pgoff_t);
int truncate_xattr_node(struct inode *, struct page *);
int wait_on_node_pages_writeback(struct f2fs_sb_info *, nid_t);
void remove_inode_page(struct inode *);
struct page *new_inode_page(struct inode *);
struct page *new_node_page(struct dnode_of_data *, unsigned int, struct page *);
void ra_node_page(struct f2fs_sb_info *, nid_t);
struct page *get_node_page(struct f2fs_sb_info *, pgoff_t);
struct page *get_node_page_ra(struct page *, int);
void sync_inode_page(struct dnode_of_data *);
int sync_node_pages(struct f2fs_sb_info *, nid_t, struct writeback_control *);
bool alloc_nid(struct f2fs_sb_info *, nid_t *);
void alloc_nid_done(struct f2fs_sb_info *, nid_t);
void alloc_nid_failed(struct f2fs_sb_info *, nid_t);
void recover_inline_xattr(struct inode *, struct page *);
void recover_xattr_data(struct inode *, struct page *, block_t);
int recover_inode_page(struct f2fs_sb_info *, struct page *);
int restore_node_summary(struct f2fs_sb_info *, unsigned int,
                                struct f2fs_summary_block *);
void flush_nat_entries(struct f2fs_sb_info *);
int build_node_manager(struct f2fs_sb_info *);
void destroy_node_manager(struct f2fs_sb_info *);
int __init create_node_manager_caches(void);
void destroy_node_manager_caches(void);

/*
 * segment.c
 */
void register_inmem_page(struct inode *, struct page *);
void commit_inmem_pages(struct inode *, bool);
void f2fs_balance_fs(struct f2fs_sb_info *);
void f2fs_balance_fs_bg(struct f2fs_sb_info *);
int f2fs_issue_flush(struct f2fs_sb_info *);
int create_flush_cmd_control(struct f2fs_sb_info *);
void destroy_flush_cmd_control(struct f2fs_sb_info *);
void invalidate_blocks(struct f2fs_sb_info *, block_t);
void refresh_sit_entry(struct f2fs_sb_info *, block_t, block_t);
void clear_prefree_segments(struct f2fs_sb_info *, struct cp_control *);
void release_discard_addrs(struct f2fs_sb_info *);
void discard_next_dnode(struct f2fs_sb_info *, block_t);
int npages_for_summary_flush(struct f2fs_sb_info *, bool);
void allocate_new_segments(struct f2fs_sb_info *);
int f2fs_trim_fs(struct f2fs_sb_info *, struct fstrim_range *);
struct page *get_sum_page(struct f2fs_sb_info *, unsigned int);
void update_meta_page(struct f2fs_sb_info *, void *, block_t);
void write_meta_page(struct f2fs_sb_info *, struct page *);
void write_node_page(unsigned int, struct f2fs_io_info *);
void write_data_page(struct dnode_of_data *, struct f2fs_io_info *);
void rewrite_data_page(struct f2fs_io_info *);
void f2fs_replace_block(struct f2fs_sb_info *, struct dnode_of_data *,
                                block_t, block_t, unsigned char, bool);
void allocate_data_block(struct f2fs_sb_info *, struct page *,
                block_t, block_t *, struct f2fs_summary *, int);
void f2fs_wait_on_page_writeback(struct page *, enum page_type);
void write_data_summaries(struct f2fs_sb_info *, block_t);
void write_node_summaries(struct f2fs_sb_info *, block_t);
int lookup_journal_in_cursum(struct f2fs_summary_block *,
                                        int, unsigned int, int);
void flush_sit_entries(struct f2fs_sb_info *, struct cp_control *);
int build_segment_manager(struct f2fs_sb_info *);
void destroy_segment_manager(struct f2fs_sb_info *);
int __init create_segment_manager_caches(void);
void destroy_segment_manager_caches(void);

/*
 * checkpoint.c
 */
struct page *grab_meta_page(struct f2fs_sb_info *, pgoff_t);
struct page *get_meta_page(struct f2fs_sb_info *, pgoff_t);
bool is_valid_blkaddr(struct f2fs_sb_info *, block_t, int);
int ra_meta_pages(struct f2fs_sb_info *, block_t, int, int);
void ra_meta_pages_cond(struct f2fs_sb_info *, pgoff_t);
long sync_meta_pages(struct f2fs_sb_info *, enum page_type, long);
void add_dirty_inode(struct f2fs_sb_info *, nid_t, int type);
void remove_dirty_inode(struct f2fs_sb_info *, nid_t, int type);
void release_dirty_inode(struct f2fs_sb_info *);
bool exist_written_data(struct f2fs_sb_info *, nid_t, int);
int acquire_orphan_inode(struct f2fs_sb_info *);
void release_orphan_inode(struct f2fs_sb_info *);
void add_orphan_inode(struct f2fs_sb_info *, nid_t);
void remove_orphan_inode(struct f2fs_sb_info *, nid_t);
void recover_orphan_inodes(struct f2fs_sb_info *);
int get_valid_checkpoint(struct f2fs_sb_info *);
void update_dirty_page(struct inode *, struct page *);
void add_dirty_dir_inode(struct inode *);
void remove_dirty_dir_inode(struct inode *);
void sync_dirty_dir_inodes(struct f2fs_sb_info *);
void write_checkpoint(struct f2fs_sb_info *, struct cp_control *);
void init_ino_entry_info(struct f2fs_sb_info *);
int __init create_checkpoint_caches(void);
void destroy_checkpoint_caches(void);

/*
 * data.c
 */
void f2fs_submit_merged_bio(struct f2fs_sb_info *, enum page_type, int);
int f2fs_submit_page_bio(struct f2fs_io_info *);
void f2fs_submit_page_mbio(struct f2fs_io_info *);
void set_data_blkaddr(struct dnode_of_data *);
int reserve_new_block(struct dnode_of_data *);
int f2fs_reserve_block(struct dnode_of_data *, pgoff_t);
unsigned int f2fs_shrink_extent_tree(struct f2fs_sb_info *, int);
void f2fs_destroy_extent_tree(struct inode *);
void f2fs_init_extent_cache(struct inode *, struct f2fs_extent *);
void f2fs_update_extent_cache(struct dnode_of_data *);
void f2fs_preserve_extent_tree(struct inode *);
struct page *get_read_data_page(struct inode *, pgoff_t, int);
struct page *find_data_page(struct inode *, pgoff_t);
struct page *get_lock_data_page(struct inode *, pgoff_t);
struct page *get_new_data_page(struct inode *, struct page *, pgoff_t, bool);
int do_write_data_page(struct f2fs_io_info *);
int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *, u64, u64);
void init_extent_cache_info(struct f2fs_sb_info *);
int __init create_extent_cache(void);
void destroy_extent_cache(void);
void f2fs_invalidate_page(struct page *, unsigned int, unsigned int);
int f2fs_release_page(struct page *, gfp_t);

/*
 * gc.c
 */
int start_gc_thread(struct f2fs_sb_info *);
void stop_gc_thread(struct f2fs_sb_info *);
block_t start_bidx_of_node(unsigned int, struct f2fs_inode_info *);
int f2fs_gc(struct f2fs_sb_info *);
void build_gc_manager(struct f2fs_sb_info *);

/*
 * recovery.c
 */
int recover_fsync_data(struct f2fs_sb_info *);
bool space_for_roll_forward(struct f2fs_sb_info *);

/*
 * debug.c
 */
#ifdef CONFIG_F2FS_STAT_FS
struct f2fs_stat_info {
        struct list_head stat_list;
        struct f2fs_sb_info *sbi;
        int all_area_segs, sit_area_segs, nat_area_segs, ssa_area_segs;
        int main_area_segs, main_area_sections, main_area_zones;
        int hit_ext, total_ext, ext_tree, ext_node;
        int ndirty_node, ndirty_dent, ndirty_dirs, ndirty_meta;
        int nats, dirty_nats, sits, dirty_sits, fnids;
        int total_count, utilization;
        int bg_gc, inline_inode, inline_dir, inmem_pages, wb_pages;
        unsigned int valid_count, valid_node_count, valid_inode_count;
        unsigned int bimodal, avg_vblocks;
        int util_free, util_valid, util_invalid;
        int rsvd_segs, overp_segs;
        int dirty_count, node_pages, meta_pages;
        int prefree_count, call_count, cp_count;
        int tot_segs, node_segs, data_segs, free_segs, free_secs;
        int bg_node_segs, bg_data_segs;
        int tot_blks, data_blks, node_blks;
        int bg_data_blks, bg_node_blks;
        int curseg[NR_CURSEG_TYPE];
        int cursec[NR_CURSEG_TYPE];
        int curzone[NR_CURSEG_TYPE];

        unsigned int segment_count[2];
        unsigned int block_count[2];
        unsigned int inplace_count;
        unsigned base_mem, cache_mem, page_mem;
};

static inline struct f2fs_stat_info *F2FS_STAT(struct f2fs_sb_info *sbi)
{
        return (struct f2fs_stat_info *)sbi->stat_info;
}

#define stat_inc_cp_count(si)           ((si)->cp_count++)
#define stat_inc_call_count(si)         ((si)->call_count++)
#define stat_inc_bggc_count(sbi)        ((sbi)->bg_gc++)
#define stat_inc_dirty_dir(sbi)         ((sbi)->n_dirty_dirs++)
#define stat_dec_dirty_dir(sbi)         ((sbi)->n_dirty_dirs--)
#define stat_inc_total_hit(sb)          ((F2FS_SB(sb))->total_hit_ext++)
#define stat_inc_read_hit(sb)           ((F2FS_SB(sb))->read_hit_ext++)
#define stat_inc_inline_inode(inode)                                    \
        do {                                                            \
                if (f2fs_has_inline_data(inode))                        \
                        (atomic_inc(&F2FS_I_SB(inode)->inline_inode));  \
        } while (0)
#define stat_dec_inline_inode(inode)                                    \
        do {                                                            \
                if (f2fs_has_inline_data(inode))                        \
                        (atomic_dec(&F2FS_I_SB(inode)->inline_inode));  \
        } while (0)
#define stat_inc_inline_dir(inode)                                      \
        do {                                                            \
                if (f2fs_has_inline_dentry(inode))                      \
                        (atomic_inc(&F2FS_I_SB(inode)->inline_dir));    \
        } while (0)
#define stat_dec_inline_dir(inode)                                      \
        do {                                                            \
                if (f2fs_has_inline_dentry(inode))                      \
                        (atomic_dec(&F2FS_I_SB(inode)->inline_dir));    \
        } while (0)
#define stat_inc_seg_type(sbi, curseg)                                  \
                ((sbi)->segment_count[(curseg)->alloc_type]++)
#define stat_inc_block_count(sbi, curseg)                               \
                ((sbi)->block_count[(curseg)->alloc_type]++)
#define stat_inc_inplace_blocks(sbi)                                    \
                (atomic_inc(&(sbi)->inplace_count))
#define stat_inc_seg_count(sbi, type, gc_type)                          \
        do {                                                            \
                struct f2fs_stat_info *si = F2FS_STAT(sbi);             \
                (si)->tot_segs++;                                       \
                if (type == SUM_TYPE_DATA) {                            \
                        si->data_segs++;                                \
                        si->bg_data_segs += (gc_type == BG_GC) ? 1 : 0; \
                } else {                                                \
                        si->node_segs++;                                \
                        si->bg_node_segs += (gc_type == BG_GC) ? 1 : 0; \
                }                                                       \
        } while (0)

#define stat_inc_tot_blk_count(si, blks)                                \
        (si->tot_blks += (blks))

#define stat_inc_data_blk_count(sbi, blks, gc_type)                     \
        do {                                                            \
                struct f2fs_stat_info *si = F2FS_STAT(sbi);             \
                stat_inc_tot_blk_count(si, blks);                       \
                si->data_blks += (blks);                                \
                si->bg_data_blks += (gc_type == BG_GC) ? (blks) : 0;    \
        } while (0)

#define stat_inc_node_blk_count(sbi, blks, gc_type)                     \
        do {                                                            \
                struct f2fs_stat_info *si = F2FS_STAT(sbi);             \
                stat_inc_tot_blk_count(si, blks);                       \
                si->node_blks += (blks);                                \
                si->bg_node_blks += (gc_type == BG_GC) ? (blks) : 0;    \
        } while (0)

int f2fs_build_stats(struct f2fs_sb_info *);
void f2fs_destroy_stats(struct f2fs_sb_info *);
void __init f2fs_create_root_stats(void);
void f2fs_destroy_root_stats(void);
#else
#define stat_inc_cp_count(si)
#define stat_inc_call_count(si)
#define stat_inc_bggc_count(si)
#define stat_inc_dirty_dir(sbi)
#define stat_dec_dirty_dir(sbi)
#define stat_inc_total_hit(sb)
#define stat_inc_read_hit(sb)
#define stat_inc_inline_inode(inode)
#define stat_dec_inline_inode(inode)
#define stat_inc_inline_dir(inode)
#define stat_dec_inline_dir(inode)
#define stat_inc_seg_type(sbi, curseg)
#define stat_inc_block_count(sbi, curseg)
#define stat_inc_inplace_blocks(sbi)
#define stat_inc_seg_count(sbi, type, gc_type)
#define stat_inc_tot_blk_count(si, blks)
#define stat_inc_data_blk_count(sbi, blks, gc_type)
#define stat_inc_node_blk_count(sbi, blks, gc_type)

static inline int f2fs_build_stats(struct f2fs_sb_info *sbi) { return 0; }
static inline void f2fs_destroy_stats(struct f2fs_sb_info *sbi) { }
static inline void __init f2fs_create_root_stats(void) { }
static inline void f2fs_destroy_root_stats(void) { }
#endif

extern const struct file_operations f2fs_dir_operations;
extern const struct file_operations f2fs_file_operations;
extern const struct inode_operations f2fs_file_inode_operations;
extern const struct address_space_operations f2fs_dblock_aops;
extern const struct address_space_operations f2fs_node_aops;
extern const struct address_space_operations f2fs_meta_aops;
extern const struct inode_operations f2fs_dir_inode_operations;
extern const struct inode_operations f2fs_symlink_inode_operations;
extern const struct inode_operations f2fs_encrypted_symlink_inode_operations;
extern const struct inode_operations f2fs_special_inode_operations;
extern struct kmem_cache *inode_entry_slab;

/*
 * inline.c
 */
bool f2fs_may_inline_data(struct inode *);
bool f2fs_may_inline_dentry(struct inode *);
void read_inline_data(struct page *, struct page *);
bool truncate_inline_inode(struct page *, u64);
int f2fs_read_inline_data(struct inode *, struct page *);
int f2fs_convert_inline_page(struct dnode_of_data *, struct page *);
int f2fs_convert_inline_inode(struct inode *);
int f2fs_write_inline_data(struct inode *, struct page *);
bool recover_inline_data(struct inode *, struct page *);
struct f2fs_dir_entry *find_in_inline_dir(struct inode *,
                                struct f2fs_filename *, struct page **);
struct f2fs_dir_entry *f2fs_parent_inline_dir(struct inode *, struct page **);
int make_empty_inline_dir(struct inode *inode, struct inode *, struct page *);
int f2fs_add_inline_entry(struct inode *, const struct qstr *, struct inode *,
                                                nid_t, umode_t);
void f2fs_delete_inline_entry(struct f2fs_dir_entry *, struct page *,
                                                struct inode *, struct inode *);
bool f2fs_empty_inline_dir(struct inode *);
int f2fs_read_inline_dir(struct file *, struct dir_context *,
                                                struct f2fs_str *);

/*
 * shrinker.c
 */
unsigned long f2fs_shrink_count(struct shrinker *, struct shrink_control *);
unsigned long f2fs_shrink_scan(struct shrinker *, struct shrink_control *);
void f2fs_join_shrinker(struct f2fs_sb_info *);
void f2fs_leave_shrinker(struct f2fs_sb_info *);

/*
 * crypto support
 */
static inline int f2fs_encrypted_inode(struct inode *inode)
{
#ifdef CONFIG_F2FS_FS_ENCRYPTION
        return file_is_encrypt(inode);
#else
        return 0;
#endif
}

static inline void f2fs_set_encrypted_inode(struct inode *inode)
{
#ifdef CONFIG_F2FS_FS_ENCRYPTION
        file_set_encrypt(inode);
#endif
}

static inline bool f2fs_bio_encrypted(struct bio *bio)
{
#ifdef CONFIG_F2FS_FS_ENCRYPTION
        return unlikely(bio->bi_private != NULL);
#else
        return false;
#endif
}

static inline int f2fs_sb_has_crypto(struct super_block *sb)
{
#ifdef CONFIG_F2FS_FS_ENCRYPTION
        return F2FS_HAS_FEATURE(sb, F2FS_FEATURE_ENCRYPT);
#else
        return 0;
#endif
}

static inline bool f2fs_may_encrypt(struct inode *inode)
{
#ifdef CONFIG_F2FS_FS_ENCRYPTION
        mode_t mode = inode->i_mode;

        return (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode));
#else
        return 0;
#endif
}

/* crypto_policy.c */
int f2fs_is_child_context_consistent_with_parent(struct inode *,
                                                        struct inode *);
int f2fs_inherit_context(struct inode *, struct inode *, struct page *);
int f2fs_process_policy(const struct f2fs_encryption_policy *, struct inode *);
int f2fs_get_policy(struct inode *, struct f2fs_encryption_policy *);

/* crypt.c */
extern struct kmem_cache *f2fs_crypt_info_cachep;
bool f2fs_valid_contents_enc_mode(uint32_t);
uint32_t f2fs_validate_encryption_key_size(uint32_t, uint32_t);
struct f2fs_crypto_ctx *f2fs_get_crypto_ctx(struct inode *);
void f2fs_release_crypto_ctx(struct f2fs_crypto_ctx *);
struct page *f2fs_encrypt(struct inode *, struct page *);
int f2fs_decrypt(struct f2fs_crypto_ctx *, struct page *);
int f2fs_decrypt_one(struct inode *, struct page *);
void f2fs_end_io_crypto_work(struct f2fs_crypto_ctx *, struct bio *);

/* crypto_key.c */
void f2fs_free_encryption_info(struct inode *, struct f2fs_crypt_info *);
int _f2fs_get_encryption_info(struct inode *inode);

/* crypto_fname.c */
bool f2fs_valid_filenames_enc_mode(uint32_t);
u32 f2fs_fname_crypto_round_up(u32, u32);
int f2fs_fname_crypto_alloc_buffer(struct inode *, u32, struct f2fs_str *);
int f2fs_fname_disk_to_usr(struct inode *, f2fs_hash_t *,
                        const struct f2fs_str *, struct f2fs_str *);
int f2fs_fname_usr_to_disk(struct inode *, const struct qstr *,
                        struct f2fs_str *);

#ifdef CONFIG_F2FS_FS_ENCRYPTION
void f2fs_restore_and_release_control_page(struct page **);
void f2fs_restore_control_page(struct page *);

int __init f2fs_init_crypto(void);
int f2fs_crypto_initialize(void);
void f2fs_exit_crypto(void);

int f2fs_has_encryption_key(struct inode *);

static inline int f2fs_get_encryption_info(struct inode *inode)
{
        struct f2fs_crypt_info *ci = F2FS_I(inode)->i_crypt_info;

        if (!ci ||
                (ci->ci_keyring_key &&
                 (ci->ci_keyring_key->flags & ((1 << KEY_FLAG_INVALIDATED) |
                                               (1 << KEY_FLAG_REVOKED) |
                                               (1 << KEY_FLAG_DEAD)))))
                return _f2fs_get_encryption_info(inode);
        return 0;
}

void f2fs_fname_crypto_free_buffer(struct f2fs_str *);
int f2fs_fname_setup_filename(struct inode *, const struct qstr *,
                                int lookup, struct f2fs_filename *);
void f2fs_fname_free_filename(struct f2fs_filename *);
#else
static inline void f2fs_restore_and_release_control_page(struct page **p) { }
static inline void f2fs_restore_control_page(struct page *p) { }

static inline int __init f2fs_init_crypto(void) { return 0; }
static inline void f2fs_exit_crypto(void) { }

static inline int f2fs_has_encryption_key(struct inode *i) { return 0; }
static inline int f2fs_get_encryption_info(struct inode *i) { return 0; }
static inline void f2fs_fname_crypto_free_buffer(struct f2fs_str *p) { }

static inline int f2fs_fname_setup_filename(struct inode *dir,
                                        const struct qstr *iname,
                                        int lookup, struct f2fs_filename *fname)
{
        memset(fname, 0, sizeof(struct f2fs_filename));
        fname->usr_fname = iname;
        fname->disk_name.name = (unsigned char *)iname->name;
        fname->disk_name.len = iname->len;
        return 0;
}

static inline void f2fs_fname_free_filename(struct f2fs_filename *fname) { }
#endif
#endif