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 /* SPDX-License-Identifier: GPL-2.0 */
 /*
  * fs/f2fs/f2fs.h
  *
  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
  *             http://www.samsung.com/
  */
 #ifndef _LINUX_F2FS_H
 #define _LINUX_F2FS_H
 
 #include <linux/uio.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/cred.h>
 #include <linux/sched/mm.h>
 #include <linux/vmalloc.h>
 #include <linux/bio.h>
 #include <linux/blkdev.h>
 #include <linux/quotaops.h>
 #include <linux/part_stat.h>
 #include <crypto/hash.h>
 
 #include <linux/fscrypt.h>
 #include <linux/fsverity.h>
 
 struct pagevec;
 
 #ifdef CONFIG_F2FS_CHECK_FS
 #define f2fs_bug_on(sbi, condition) BUG_ON(condition)
 #else
 #define f2fs_bug_on(sbi, condition)                 \
     do {                                \
         if (WARN_ON(condition))                 \
             set_sbi_flag(sbi, SBI_NEED_FSCK);       \
     } while (0)
 #endif
 
 enum {
     FAULT_KMALLOC,
     FAULT_KVMALLOC,
     FAULT_PAGE_ALLOC,
     FAULT_PAGE_GET,
     FAULT_ALLOC_BIO,    /* it's obsolete due to bio_alloc() will never fail */
     FAULT_ALLOC_NID,
     FAULT_ORPHAN,
     FAULT_BLOCK,
     FAULT_DIR_DEPTH,
     FAULT_EVICT_INODE,
     FAULT_TRUNCATE,
     FAULT_READ_IO,
     FAULT_CHECKPOINT,
     FAULT_DISCARD,
     FAULT_WRITE_IO,
     FAULT_SLAB_ALLOC,
     FAULT_DQUOT_INIT,
     FAULT_LOCK_OP,
     FAULT_MAX,
 };
 
 #ifdef CONFIG_F2FS_FAULT_INJECTION
 #define F2FS_ALL_FAULT_TYPE     ((1 << FAULT_MAX) - 1)
 
 struct f2fs_fault_info {
     atomic_t inject_ops;
     unsigned int inject_rate;
     unsigned int inject_type;
 };
 
 extern const char *f2fs_fault_name[FAULT_MAX];
 #define IS_FAULT_SET(fi, type) ((fi)->inject_type & (1 << (type)))
 #endif
 
 /*
  * For mount options
  */
 #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_DATA_FLUSH       0x00008000
 #define F2FS_MOUNT_FAULT_INJECTION  0x00010000
 #define F2FS_MOUNT_USRQUOTA     0x00080000
 #define F2FS_MOUNT_GRPQUOTA     0x00100000
 #define F2FS_MOUNT_PRJQUOTA     0x00200000
 #define F2FS_MOUNT_QUOTA        0x00400000
 #define F2FS_MOUNT_INLINE_XATTR_SIZE    0x00800000
 #define F2FS_MOUNT_RESERVE_ROOT     0x01000000
 #define F2FS_MOUNT_DISABLE_CHECKPOINT   0x02000000
 #define F2FS_MOUNT_NORECOVERY       0x04000000
 #define F2FS_MOUNT_ATGC         0x08000000
 #define F2FS_MOUNT_MERGE_CHECKPOINT 0x10000000
 #define F2FS_MOUNT_GC_MERGE     0x20000000
 #define F2FS_MOUNT_COMPRESS_CACHE   0x40000000
 
 #define F2FS_OPTION(sbi)    ((sbi)->mount_opt)
 #define clear_opt(sbi, option)  (F2FS_OPTION(sbi).opt &= ~F2FS_MOUNT_##option)
 #define set_opt(sbi, option)    (F2FS_OPTION(sbi).opt |= F2FS_MOUNT_##option)
 #define test_opt(sbi, option)   (F2FS_OPTION(sbi).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;
 
 #define COMPRESS_EXT_NUM        16
 
 /*
  * An implementation of an rwsem that is explicitly unfair to readers. This
  * prevents priority inversion when a low-priority reader acquires the read lock
  * while sleeping on the write lock but the write lock is needed by
  * higher-priority clients.
  */
 
 struct f2fs_rwsem {
         struct rw_semaphore internal_rwsem;
 #ifdef CONFIG_F2FS_UNFAIR_RWSEM
         wait_queue_head_t read_waiters;
 #endif
 };
 
 struct f2fs_mount_info {
     unsigned int opt;
     int write_io_size_bits;     /* Write IO size bits */
     block_t root_reserved_blocks;   /* root reserved blocks */
     kuid_t s_resuid;        /* reserved blocks for uid */
     kgid_t s_resgid;        /* reserved blocks for gid */
     int active_logs;        /* # of active logs */
     int inline_xattr_size;      /* inline xattr size */
 #ifdef CONFIG_F2FS_FAULT_INJECTION
     struct f2fs_fault_info fault_info;  /* For fault injection */
 #endif
 #ifdef CONFIG_QUOTA
     /* Names of quota files with journalled quota */
     char *s_qf_names[MAXQUOTAS];
     int s_jquota_fmt;           /* Format of quota to use */
 #endif
     /* For which write hints are passed down to block layer */
     int alloc_mode;         /* segment allocation policy */
     int fsync_mode;         /* fsync policy */
     int fs_mode;            /* fs mode: LFS or ADAPTIVE */
     int bggc_mode;          /* bggc mode: off, on or sync */
     int memory_mode;        /* memory mode */
     int discard_unit;       /*
                      * discard command's offset/size should
                      * be aligned to this unit: block,
                      * segment or section
                      */
     struct fscrypt_dummy_policy dummy_enc_policy; /* test dummy encryption */
     block_t unusable_cap_perc;  /* percentage for cap */
     block_t unusable_cap;       /* Amount of space allowed to be
                      * unusable when disabling checkpoint
                      */
 
     /* For compression */
     unsigned char compress_algorithm;   /* algorithm type */
     unsigned char compress_log_size;    /* cluster log size */
     unsigned char compress_level;       /* compress level */
     bool compress_chksum;           /* compressed data chksum */
     unsigned char compress_ext_cnt;     /* extension count */
     unsigned char nocompress_ext_cnt;       /* nocompress extension count */
     int compress_mode;          /* compression mode */
     unsigned char extensions[COMPRESS_EXT_NUM][F2FS_EXTENSION_LEN]; /* extensions */
     unsigned char noextensions[COMPRESS_EXT_NUM][F2FS_EXTENSION_LEN]; /* extensions */
 };
 
 #define F2FS_FEATURE_ENCRYPT        0x0001
 #define F2FS_FEATURE_BLKZONED       0x0002
 #define F2FS_FEATURE_ATOMIC_WRITE   0x0004
 #define F2FS_FEATURE_EXTRA_ATTR     0x0008
 #define F2FS_FEATURE_PRJQUOTA       0x0010
 #define F2FS_FEATURE_INODE_CHKSUM   0x0020
 #define F2FS_FEATURE_FLEXIBLE_INLINE_XATTR  0x0040
 #define F2FS_FEATURE_QUOTA_INO      0x0080
 #define F2FS_FEATURE_INODE_CRTIME   0x0100
 #define F2FS_FEATURE_LOST_FOUND     0x0200
 #define F2FS_FEATURE_VERITY     0x0400
 #define F2FS_FEATURE_SB_CHKSUM      0x0800
 #define F2FS_FEATURE_CASEFOLD       0x1000
 #define F2FS_FEATURE_COMPRESSION    0x2000
 #define F2FS_FEATURE_RO         0x4000
 
 #define __F2FS_HAS_FEATURE(raw_super, mask)             \
     ((raw_super->feature & cpu_to_le32(mask)) != 0)
 #define F2FS_HAS_FEATURE(sbi, mask) __F2FS_HAS_FEATURE(sbi->raw_super, mask)
 #define F2FS_SET_FEATURE(sbi, mask)                 \
     (sbi->raw_super->feature |= cpu_to_le32(mask))
 #define F2FS_CLEAR_FEATURE(sbi, mask)                   \
     (sbi->raw_super->feature &= ~cpu_to_le32(mask))
 
 /*
  * Default values for user and/or group using reserved blocks
  */
 #define F2FS_DEF_RESUID     0
 #define F2FS_DEF_RESGID     0
 
 /*
  * For checkpoint manager
  */
 enum {
     NAT_BITMAP,
     SIT_BITMAP
 };
 
 #define CP_UMOUNT   0x00000001
 #define CP_FASTBOOT 0x00000002
 #define CP_SYNC     0x00000004
 #define CP_RECOVERY 0x00000008
 #define CP_DISCARD  0x00000010
 #define CP_TRIMMED  0x00000020
 #define CP_PAUSE    0x00000040
 #define CP_RESIZE   0x00000080
 
 #define DEF_MAX_DISCARD_REQUEST     8   /* issue 8 discards per round */
 #define DEF_MIN_DISCARD_ISSUE_TIME  50  /* 50 ms, if exists */
 #define DEF_MID_DISCARD_ISSUE_TIME  500 /* 500 ms, if device busy */
 #define DEF_MAX_DISCARD_ISSUE_TIME  60000   /* 60 s, if no candidates */
 #define DEF_DISCARD_URGENT_UTIL     80  /* do more discard over 80% */
 #define DEF_CP_INTERVAL         60  /* 60 secs */
 #define DEF_IDLE_INTERVAL       5   /* 5 secs */
 #define DEF_DISABLE_INTERVAL        5   /* 5 secs */
 #define DEF_DISABLE_QUICK_INTERVAL  1   /* 1 secs */
 #define DEF_UMOUNT_DISCARD_TIMEOUT  5   /* 5 secs */
 
 struct cp_control {
     int reason;
     __u64 trim_start;
     __u64 trim_end;
     __u64 trim_minlen;
 };
 
 /*
  * indicate meta/data type
  */
 enum {
     META_CP,
     META_NAT,
     META_SIT,
     META_SSA,
     META_MAX,
     META_POR,
     DATA_GENERIC,       /* check range only */
     DATA_GENERIC_ENHANCE,   /* strong check on range and segment bitmap */
     DATA_GENERIC_ENHANCE_READ,  /*
                      * strong check on range and segment
                      * bitmap but no warning due to race
                      * condition of read on truncated area
                      * by extent_cache
                      */
     META_GENERIC,
 };
 
 /* for the list of ino */
 enum {
     ORPHAN_INO,     /* for orphan ino list */
     APPEND_INO,     /* for append ino list */
     UPDATE_INO,     /* for update ino list */
     TRANS_DIR_INO,      /* for trasactions dir ino list */
     FLUSH_INO,      /* for multiple device flushing */
     MAX_INO_ENTRY,      /* max. list */
 };
 
 struct ino_entry {
     struct list_head list;      /* list head */
     nid_t ino;          /* inode number */
     unsigned int dirty_device;  /* dirty device bitmap */
 };
 
 /* for the list of inodes to be GCed */
 struct inode_entry {
     struct list_head list;  /* list head */
     struct inode *inode;    /* vfs inode pointer */
 };
 
 struct fsync_node_entry {
     struct list_head list;  /* list head */
     struct page *page;  /* warm node page pointer */
     unsigned int seq_id;    /* sequence id */
 };
 
 struct ckpt_req {
     struct completion wait;     /* completion for checkpoint done */
     struct llist_node llnode;   /* llist_node to be linked in wait queue */
     int ret;            /* return code of checkpoint */
     ktime_t queue_time;     /* request queued time */
 };
 
 struct ckpt_req_control {
     struct task_struct *f2fs_issue_ckpt;    /* checkpoint task */
     int ckpt_thread_ioprio;         /* checkpoint merge thread ioprio */
     wait_queue_head_t ckpt_wait_queue;  /* waiting queue for wake-up */
     atomic_t issued_ckpt;       /* # of actually issued ckpts */
     atomic_t total_ckpt;        /* # of total ckpts */
     atomic_t queued_ckpt;       /* # of queued ckpts */
     struct llist_head issue_list;   /* list for command issue */
     spinlock_t stat_lock;       /* lock for below checkpoint time stats */
     unsigned int cur_time;      /* cur wait time in msec for currently issued checkpoint */
     unsigned int peak_time;     /* peak wait time in msec until now */
 };
 
 /* for the bitmap indicate blocks to be discarded */
 struct discard_entry {
     struct list_head list;  /* list head */
     block_t start_blkaddr;  /* start blockaddr of current segment */
     unsigned char discard_map[SIT_VBLOCK_MAP_SIZE]; /* segment discard bitmap */
 };
 
 /* default discard granularity of inner discard thread, unit: block count */
 #define DEFAULT_DISCARD_GRANULARITY     16
 
 /* max discard pend list number */
 #define MAX_PLIST_NUM       512
 #define plist_idx(blk_num)  ((blk_num) >= MAX_PLIST_NUM ?       \
                     (MAX_PLIST_NUM - 1) : ((blk_num) - 1))
 
 enum {
     D_PREP,         /* initial */
     D_PARTIAL,      /* partially submitted */
     D_SUBMIT,       /* all submitted */
     D_DONE,         /* finished */
 };
 
 struct discard_info {
     block_t lstart;         /* logical start address */
     block_t len;            /* length */
     block_t start;          /* actual start address in dev */
 };
 
 struct discard_cmd {
     struct rb_node rb_node;     /* rb node located in rb-tree */
     union {
         struct {
             block_t lstart; /* logical start address */
             block_t len;    /* length */
             block_t start;  /* actual start address in dev */
         };
         struct discard_info di; /* discard info */
 
     };
     struct list_head list;      /* command list */
     struct completion wait;     /* compleation */
     struct block_device *bdev;  /* bdev */
     unsigned short ref;     /* reference count */
     unsigned char state;        /* state */
     unsigned char queued;       /* queued discard */
     int error;          /* bio error */
     spinlock_t lock;        /* for state/bio_ref updating */
     unsigned short bio_ref;     /* bio reference count */
 };
 
 enum {
     DPOLICY_BG,
     DPOLICY_FORCE,
     DPOLICY_FSTRIM,
     DPOLICY_UMOUNT,
     MAX_DPOLICY,
 };
 
 struct discard_policy {
     int type;           /* type of discard */
     unsigned int min_interval;  /* used for candidates exist */
     unsigned int mid_interval;  /* used for device busy */
     unsigned int max_interval;  /* used for candidates not exist */
     unsigned int max_requests;  /* # of discards issued per round */
     unsigned int io_aware_gran; /* minimum granularity discard not be aware of I/O */
     bool io_aware;          /* issue discard in idle time */
     bool sync;          /* submit discard with REQ_SYNC flag */
     bool ordered;           /* issue discard by lba order */
     bool timeout;           /* discard timeout for put_super */
     unsigned int granularity;   /* discard granularity */
 };
 
 struct discard_cmd_control {
     struct task_struct *f2fs_issue_discard; /* discard thread */
     struct list_head entry_list;        /* 4KB discard entry list */
     struct list_head pend_list[MAX_PLIST_NUM];/* store pending entries */
     struct list_head wait_list;     /* store on-flushing entries */
     struct list_head fstrim_list;       /* in-flight discard from fstrim */
     wait_queue_head_t discard_wait_queue;   /* waiting queue for wake-up */
     unsigned int discard_wake;      /* to wake up discard thread */
     struct mutex cmd_lock;
     unsigned int nr_discards;       /* # of discards in the list */
     unsigned int max_discards;      /* max. discards to be issued */
     unsigned int max_discard_request;   /* max. discard request per round */
     unsigned int min_discard_issue_time;    /* min. interval between discard issue */
     unsigned int mid_discard_issue_time;    /* mid. interval between discard issue */
     unsigned int max_discard_issue_time;    /* max. interval between discard issue */
     unsigned int discard_granularity;   /* discard granularity */
     unsigned int undiscard_blks;        /* # of undiscard blocks */
     unsigned int next_pos;          /* next discard position */
     atomic_t issued_discard;        /* # of issued discard */
     atomic_t queued_discard;        /* # of queued discard */
     atomic_t discard_cmd_cnt;       /* # of cached cmd count */
     struct rb_root_cached root;     /* root of discard rb-tree */
     bool rbtree_check;          /* config for consistence check */
 };
 
 /* 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);
 }
 
 /* for inline stuff */
 #define DEF_INLINE_RESERVED_SIZE    1
 static inline int get_extra_isize(struct inode *inode);
 static inline int get_inline_xattr_addrs(struct inode *inode);
 #define MAX_INLINE_DATA(inode)  (sizeof(__le32) *           \
                 (CUR_ADDRS_PER_INODE(inode) -       \
                 get_inline_xattr_addrs(inode) - \
                 DEF_INLINE_RESERVED_SIZE))
 
 /* for inline dir */
 #define NR_INLINE_DENTRY(inode) (MAX_INLINE_DATA(inode) * BITS_PER_BYTE / \
                 ((SIZE_OF_DIR_ENTRY + F2FS_SLOT_LEN) * \
                 BITS_PER_BYTE + 1))
 #define INLINE_DENTRY_BITMAP_SIZE(inode) \
     DIV_ROUND_UP(NR_INLINE_DENTRY(inode), BITS_PER_BYTE)
 #define INLINE_RESERVED_SIZE(inode) (MAX_INLINE_DATA(inode) - \
                 ((SIZE_OF_DIR_ENTRY + F2FS_SLOT_LEN) * \
                 NR_INLINE_DENTRY(inode) + \
                 INLINE_DENTRY_BITMAP_SIZE(inode)))
 
 /*
  * For INODE and NODE manager
  */
 /* for directory operations */
 
 struct f2fs_filename {
     /*
      * The filename the user specified.  This is NULL for some
      * filesystem-internal operations, e.g. converting an inline directory
      * to a non-inline one, or roll-forward recovering an encrypted dentry.
      */
     const struct qstr *usr_fname;
 
     /*
      * The on-disk filename.  For encrypted directories, this is encrypted.
      * This may be NULL for lookups in an encrypted dir without the key.
      */
     struct fscrypt_str disk_name;
 
     /* The dirhash of this filename */
     f2fs_hash_t hash;
 
 #ifdef CONFIG_FS_ENCRYPTION
     /*
      * For lookups in encrypted directories: either the buffer backing
      * disk_name, or a buffer that holds the decoded no-key name.
      */
     struct fscrypt_str crypto_buf;
 #endif
 #if IS_ENABLED(CONFIG_UNICODE)
     /*
      * For casefolded directories: the casefolded name, but it's left NULL
      * if the original name is not valid Unicode, if the original name is
      * "." or "..", if the directory is both casefolded and encrypted and
      * its encryption key is unavailable, or if the filesystem is doing an
      * internal operation where usr_fname is also NULL.  In all these cases
      * we fall back to treating the name as an opaque byte sequence.
      */
     struct fscrypt_str cf_name;
 #endif
 };
 
 struct f2fs_dentry_ptr {
     struct inode *inode;
     void *bitmap;
     struct f2fs_dir_entry *dentry;
     __u8 (*filename)[F2FS_SLOT_LEN];
     int max;
     int nr_bitmap;
 };
 
 static inline void make_dentry_ptr_block(struct inode *inode,
         struct f2fs_dentry_ptr *d, struct f2fs_dentry_block *t)
 {
     d->inode = inode;
     d->max = NR_DENTRY_IN_BLOCK;
     d->nr_bitmap = SIZE_OF_DENTRY_BITMAP;
     d->bitmap = t->dentry_bitmap;
     d->dentry = t->dentry;
     d->filename = t->filename;
 }
 
 static inline void make_dentry_ptr_inline(struct inode *inode,
                     struct f2fs_dentry_ptr *d, void *t)
 {
     int entry_cnt = NR_INLINE_DENTRY(inode);
     int bitmap_size = INLINE_DENTRY_BITMAP_SIZE(inode);
     int reserved_size = INLINE_RESERVED_SIZE(inode);
 
     d->inode = inode;
     d->max = entry_cnt;
     d->nr_bitmap = bitmap_size;
     d->bitmap = t;
     d->dentry = t + bitmap_size + reserved_size;
     d->filename = t + bitmap_size + reserved_size +
                     SIZE_OF_DIR_ENTRY * entry_cnt;
 }
 
 /*
  * 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 DEFAULT_RETRY_IO_COUNT  8   /* maximum retry read IO or flush count */
 
 /* congestion wait timeout value, default: 20ms */
 #define DEFAULT_IO_TIMEOUT  (msecs_to_jiffies(20))
 
 /* maximum retry quota flush count */
 #define DEFAULT_RETRY_QUOTA_FLUSH_COUNT     8
 
 /* maximum retry of EIO'ed page */
 #define MAX_RETRY_PAGE_EIO          100
 
 #define F2FS_LINK_MAX   0xffffffff  /* maximum link count per file */
 
 #define MAX_DIR_RA_PAGES    4   /* maximum ra pages of dir */
 
 /* dirty segments threshold for triggering CP */
 #define DEFAULT_DIRTY_THRESHOLD     4
 
 /* 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
 
 #define RECOVERY_MAX_RA_BLOCKS      BIO_MAX_VECS
 #define RECOVERY_MIN_RA_BLOCKS      1
 
 #define F2FS_ONSTACK_PAGES  16  /* nr of onstack pages */
 
 struct rb_entry {
     struct rb_node rb_node;     /* rb node located in rb-tree */
     union {
         struct {
             unsigned int ofs;   /* start offset of the entry */
             unsigned int len;   /* length of the entry */
         };
         unsigned long long key;     /* 64-bits key */
     } __packed;
 };
 
 struct extent_info {
     unsigned int fofs;      /* start offset in a file */
     unsigned int len;       /* length of the extent */
     u32 blk;            /* start block address of the extent */
 #ifdef CONFIG_F2FS_FS_COMPRESSION
     unsigned int c_len;     /* physical extent length of compressed blocks */
 #endif
 };
 
 struct extent_node {
     struct rb_node rb_node;     /* rb node located in rb-tree */
     struct extent_info ei;      /* extent info */
     struct list_head list;      /* node in global extent list of sbi */
     struct extent_tree *et;     /* extent tree pointer */
 };
 
 struct extent_tree {
     nid_t ino;          /* inode number */
     struct rb_root_cached 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*/
     bool largest_updated;       /* largest extent updated */
 };
 
 /*
  * 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 {
     struct block_device *m_bdev;    /* for multi-device dio */
     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 */
     pgoff_t *m_next_extent;     /* point to next possible extent */
     int m_seg_type;
     bool m_may_create;      /* indicate it is from write path */
     bool m_multidev_dio;        /* indicate it allows multi-device dio */
 };
 
 /* for flag in get_data_block */
 enum {
     F2FS_GET_BLOCK_DEFAULT,
     F2FS_GET_BLOCK_FIEMAP,
     F2FS_GET_BLOCK_BMAP,
     F2FS_GET_BLOCK_DIO,
     F2FS_GET_BLOCK_PRE_DIO,
     F2FS_GET_BLOCK_PRE_AIO,
     F2FS_GET_BLOCK_PRECACHE,
 };
 
 /*
  * 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 FADVISE_KEEP_SIZE_BIT   0x10
 #define FADVISE_HOT_BIT     0x20
 #define FADVISE_VERITY_BIT  0x40
 #define FADVISE_TRUNC_BIT   0x80
 
 #define FADVISE_MODIFIABLE_BITS (FADVISE_COLD_BIT | FADVISE_HOT_BIT)
 
 #define file_is_cold(inode) is_file(inode, FADVISE_COLD_BIT)
 #define file_set_cold(inode)    set_file(inode, FADVISE_COLD_BIT)
 #define file_clear_cold(inode)  clear_file(inode, FADVISE_COLD_BIT)
 
 #define file_wrong_pino(inode)  is_file(inode, FADVISE_LOST_PINO_BIT)
 #define file_lost_pino(inode)   set_file(inode, FADVISE_LOST_PINO_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_enc_name(inode)    is_file(inode, FADVISE_ENC_NAME_BIT)
 #define file_set_enc_name(inode) set_file(inode, FADVISE_ENC_NAME_BIT)
 
 #define file_keep_isize(inode)  is_file(inode, FADVISE_KEEP_SIZE_BIT)
 #define file_set_keep_isize(inode) set_file(inode, FADVISE_KEEP_SIZE_BIT)
 
 #define file_is_hot(inode)  is_file(inode, FADVISE_HOT_BIT)
 #define file_set_hot(inode) set_file(inode, FADVISE_HOT_BIT)
 #define file_clear_hot(inode)   clear_file(inode, FADVISE_HOT_BIT)
 
 #define file_is_verity(inode)   is_file(inode, FADVISE_VERITY_BIT)
 #define file_set_verity(inode)  set_file(inode, FADVISE_VERITY_BIT)
 
 #define file_should_truncate(inode) is_file(inode, FADVISE_TRUNC_BIT)
 #define file_need_truncate(inode)   set_file(inode, FADVISE_TRUNC_BIT)
 #define file_dont_truncate(inode)   clear_file(inode, FADVISE_TRUNC_BIT)
 
 #define DEF_DIR_LEVEL       0
 
 enum {
     GC_FAILURE_PIN,
     MAX_GC_FAILURE
 };
 
 /* 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_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_SKIP_WRITES,     /* should skip data page writeback */
     FI_OPU_WRITE,       /* used for opu per file */
     FI_DIRTY_FILE,      /* indicate regular/symlink has dirty pages */
     FI_PREALLOCATED_ALL,    /* all blocks for write were preallocated */
     FI_HOT_DATA,        /* indicate file is hot */
     FI_EXTRA_ATTR,      /* indicate file has extra attribute */
     FI_PROJ_INHERIT,    /* indicate file inherits projectid */
     FI_PIN_FILE,        /* indicate file should not be gced */
     FI_VERITY_IN_PROGRESS,  /* building fs-verity Merkle tree */
     FI_COMPRESSED_FILE, /* indicate file's data can be compressed */
     FI_COMPRESS_CORRUPT,    /* indicate compressed cluster is corrupted */
     FI_MMAP_FILE,       /* indicate file was mmapped */
     FI_ENABLE_COMPRESS, /* enable compression in "user" compression mode */
     FI_COMPRESS_RELEASED,   /* compressed blocks were released */
     FI_ALIGNED_WRITE,   /* enable aligned write */
     FI_COW_FILE,        /* indicate COW file */
     FI_MAX,         /* max flag, never be used */
 };
 
 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;   /* only for directory depth */
     /* for gc failure statistic */
     unsigned int i_gc_failures[MAX_GC_FAILURE];
     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[BITS_TO_LONGS(FI_MAX)]; /* use to pass per-file flags */
     struct f2fs_rwsem 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 */
     struct task_struct *task;   /* lookup and create consistency */
     struct task_struct *cp_task;    /* separate cp/wb IO stats*/
     nid_t i_xattr_nid;      /* node id that contains xattrs */
     loff_t  last_disk_size;     /* lastly written file size */
     spinlock_t i_size_lock;     /* protect last_disk_size */
 
 #ifdef CONFIG_QUOTA
     struct dquot *i_dquot[MAXQUOTAS];
 
     /* quota space reservation, managed internally by quota code */
     qsize_t i_reserved_quota;
 #endif
     struct list_head dirty_list;    /* dirty list for dirs and files */
     struct list_head gdirty_list;   /* linked in global dirty list */
     struct task_struct *atomic_write_task;  /* store atomic write task */
     struct extent_tree *extent_tree;    /* cached extent_tree entry */
     struct inode *cow_inode;    /* copy-on-write inode for atomic write */
 
     /* avoid racing between foreground op and gc */
     struct f2fs_rwsem i_gc_rwsem[2];
     struct f2fs_rwsem i_xattr_sem; /* avoid racing between reading and changing EAs */
 
     int i_extra_isize;      /* size of extra space located in i_addr */
     kprojid_t i_projid;     /* id for project quota */
     int i_inline_xattr_size;    /* inline xattr size */
     struct timespec64 i_crtime; /* inode creation time */
     struct timespec64 i_disk_time[4];/* inode disk times */
 
     /* for file compress */
     atomic_t i_compr_blocks;        /* # of compressed blocks */
     unsigned char i_compress_algorithm; /* algorithm type */
     unsigned char i_log_cluster_size;   /* log of cluster size */
     unsigned char i_compress_level;     /* compress level (lz4hc,zstd) */
     unsigned short i_compress_flag;     /* compress flag */
     unsigned int i_cluster_size;        /* cluster size */
 
     unsigned int atomic_write_cnt;
 };
 
 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;
 #ifdef CONFIG_F2FS_FS_COMPRESSION
     ei->c_len = 0;
 #endif
 }
 
 static inline bool __is_discard_mergeable(struct discard_info *back,
             struct discard_info *front, unsigned int max_len)
 {
     return (back->lstart + back->len == front->lstart) &&
         (back->len + front->len <= max_len);
 }
 
 static inline bool __is_discard_back_mergeable(struct discard_info *cur,
             struct discard_info *back, unsigned int max_len)
 {
     return __is_discard_mergeable(back, cur, max_len);
 }
 
 static inline bool __is_discard_front_mergeable(struct discard_info *cur,
             struct discard_info *front, unsigned int max_len)
 {
     return __is_discard_mergeable(cur, front, max_len);
 }
 
 static inline bool __is_extent_mergeable(struct extent_info *back,
                         struct extent_info *front)
 {
 #ifdef CONFIG_F2FS_FS_COMPRESSION
     if (back->c_len && back->len != back->c_len)
         return false;
     if (front->c_len && front->len != front->c_len)
         return false;
 #endif
     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 *inode, bool sync);
 static inline void __try_update_largest_extent(struct extent_tree *et,
                         struct extent_node *en)
 {
     if (en->ei.len > et->largest.len) {
         et->largest = en->ei;
         et->largest_updated = true;
     }
 }
 
 /*
  * For free nid management
  */
 enum nid_state {
     FREE_NID,       /* newly added to free nid list */
     PREALLOC_NID,       /* it is preallocated */
     MAX_NID_STATE,
 };
 
 enum nat_state {
     TOTAL_NAT,
     DIRTY_NAT,
     RECLAIMABLE_NAT,
     MAX_NAT_STATE,
 };
 
 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;       /* # of available node ids */
     nid_t next_scan_nid;        /* the next nid to be scanned */
     nid_t max_rf_node_blocks;   /* max # of nodes for recovery */
     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 f2fs_rwsem nat_tree_lock;    /* protect nat entry tree */
     struct list_head nat_entries;   /* cached nat entry list (clean) */
     spinlock_t nat_list_lock;   /* protect clean nat entry list */
     unsigned int nat_cnt[MAX_NAT_STATE]; /* the # of cached nat entries */
     unsigned int nat_blocks;    /* # of nat blocks */
 
     /* free node ids management */
     struct radix_tree_root free_nid_root;/* root of the free_nid cache */
     struct list_head free_nid_list;     /* list for free nids excluding preallocated nids */
     unsigned int nid_cnt[MAX_NID_STATE];    /* the number of free node id */
     spinlock_t nid_list_lock;   /* protect nid lists ops */
     struct mutex build_lock;    /* lock for build free nids */
     unsigned char **free_nid_bitmap;
     unsigned char *nat_block_bitmap;
     unsigned short *free_nid_count; /* free nid count of NAT block */
 
     /* for checkpoint */
     char *nat_bitmap;       /* NAT bitmap pointer */
 
     unsigned int nat_bits_blocks;   /* # of nat bits blocks */
     unsigned char *nat_bits;    /* NAT bits blocks */
     unsigned char *full_nat_bits;   /* full NAT pages */
     unsigned char *empty_nat_bits;  /* empty NAT pages */
 #ifdef CONFIG_F2FS_CHECK_FS
     char *nat_bitmap_mir;       /* NAT bitmap mirror */
 #endif
     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_INMEM_TYPE    (2)
 #define NR_CURSEG_RO_TYPE   (2)
 #define NR_CURSEG_PERSIST_TYPE  (NR_CURSEG_DATA_TYPE + NR_CURSEG_NODE_TYPE)
 #define NR_CURSEG_TYPE      (NR_CURSEG_INMEM_TYPE + NR_CURSEG_PERSIST_TYPE)
 
 enum {
     CURSEG_HOT_DATA = 0,    /* directory entry blocks */
     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 */
     NR_PERSISTENT_LOG,  /* number of persistent log */
     CURSEG_COLD_DATA_PINNED = NR_PERSISTENT_LOG,
                 /* pinned file that needs consecutive block address */
     CURSEG_ALL_DATA_ATGC,   /* SSR alloctor in hot/warm/cold data area */
     NO_CHECK_TYPE,      /* number of persistent & inmem log */
 };
 
 struct flush_cmd {
     struct completion wait;
     struct llist_node llnode;
     nid_t ino;
     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 issued_flush;          /* # of issued flushes */
     atomic_t queued_flush;          /* # of queued 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 */
 
     struct f2fs_rwsem curseg_lock;  /* for preventing curseg change */
 
     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 additional_reserved_segments;/* reserved segs for IO align feature */
     unsigned int ovp_segments;  /* # of overprovision segments */
 
     /* a threshold to reclaim prefree segments */
     unsigned int rec_prefree_segments;
 
     /* 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 */
     unsigned int min_seq_blocks;    /* threshold for sequential blocks */
     unsigned int min_hot_blocks;    /* threshold for hot block allocation */
     unsigned int min_ssr_sections;  /* threshold to trigger SSR allocation */
 
     /* for flush command control */
     struct flush_cmd_control *fcc_info;
 
     /* for discard command control */
     struct discard_cmd_control *dcc_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.
  */
 #define WB_DATA_TYPE(p) (__is_cp_guaranteed(p) ? F2FS_WB_CP_DATA : F2FS_WB_DATA)
 enum count_type {
     F2FS_DIRTY_DENTS,
     F2FS_DIRTY_DATA,
     F2FS_DIRTY_QDATA,
     F2FS_DIRTY_NODES,
     F2FS_DIRTY_META,
     F2FS_DIRTY_IMETA,
     F2FS_WB_CP_DATA,
     F2FS_WB_DATA,
     F2FS_RD_DATA,
     F2FS_RD_NODE,
     F2FS_RD_META,
     F2FS_DIO_WRITE,
     F2FS_DIO_READ,
     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 = 0,
     NODE = 1,   /* should not change this */
     META,
     NR_PAGE_TYPE,
     META_FLUSH,
     IPU,        /* the below types are used by tracepoints only. */
     OPU,
 };
 
 enum temp_type {
     HOT = 0,    /* must be zero for meta bio */
     WARM,
     COLD,
     NR_TEMP_TYPE,
 };
 
 enum need_lock_type {
     LOCK_REQ = 0,
     LOCK_DONE,
     LOCK_RETRY,
 };
 
 enum cp_reason_type {
     CP_NO_NEEDED,
     CP_NON_REGULAR,
     CP_COMPRESSED,
     CP_HARDLINK,
     CP_SB_NEED_CP,
     CP_WRONG_PINO,
     CP_NO_SPC_ROLL,
     CP_NODE_NEED_CP,
     CP_FASTBOOT_MODE,
     CP_SPEC_LOG_NUM,
     CP_RECOVER_DIR,
 };
 
 enum iostat_type {
     /* WRITE IO */
     APP_DIRECT_IO,          /* app direct write IOs */
     APP_BUFFERED_IO,        /* app buffered write IOs */
     APP_WRITE_IO,           /* app write IOs */
     APP_MAPPED_IO,          /* app mapped IOs */
     FS_DATA_IO,         /* data IOs from kworker/fsync/reclaimer */
     FS_NODE_IO,         /* node IOs from kworker/fsync/reclaimer */
     FS_META_IO,         /* meta IOs from kworker/reclaimer */
     FS_GC_DATA_IO,          /* data IOs from forground gc */
     FS_GC_NODE_IO,          /* node IOs from forground gc */
     FS_CP_DATA_IO,          /* data IOs from checkpoint */
     FS_CP_NODE_IO,          /* node IOs from checkpoint */
     FS_CP_META_IO,          /* meta IOs from checkpoint */
 
     /* READ IO */
     APP_DIRECT_READ_IO,     /* app direct read IOs */
     APP_BUFFERED_READ_IO,       /* app buffered read IOs */
     APP_READ_IO,            /* app read IOs */
     APP_MAPPED_READ_IO,     /* app mapped read IOs */
     FS_DATA_READ_IO,        /* data read IOs */
     FS_GDATA_READ_IO,       /* data read IOs from background gc */
     FS_CDATA_READ_IO,       /* compressed data read IOs */
     FS_NODE_READ_IO,        /* node read IOs */
     FS_META_READ_IO,        /* meta read IOs */
 
     /* other */
     FS_DISCARD,         /* discard */
     NR_IO_TYPE,
 };
 
 struct f2fs_io_info {
     struct f2fs_sb_info *sbi;   /* f2fs_sb_info pointer */
     nid_t ino;      /* inode number */
     enum page_type type;    /* contains DATA/NODE/META/META_FLUSH */
     enum temp_type temp;    /* contains HOT/WARM/COLD */
     enum req_op op;     /* contains REQ_OP_ */
     blk_opf_t op_flags; /* req_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 */
     struct page *compressed_page;   /* compressed page */
     struct list_head list;      /* serialize IOs */
     bool submitted;     /* indicate IO submission */
     int need_lock;      /* indicate we need to lock cp_rwsem */
     bool in_list;       /* indicate fio is in io_list */
     bool is_por;        /* indicate IO is from recovery or not */
     bool retry;     /* need to reallocate block address */
     int compr_blocks;   /* # of compressed block addresses */
     bool encrypted;     /* indicate file is encrypted */
     bool post_read;     /* require post read */
     enum iostat_type io_type;   /* io type */
     struct writeback_control *io_wbc; /* writeback control */
     struct bio **bio;       /* bio for ipu */
     sector_t *last_block;       /* last block number in bio */
     unsigned char version;      /* version of the node */
 };
 
 struct bio_entry {
     struct bio *bio;
     struct list_head list;
 };
 
 #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 f2fs_rwsem io_rwsem; /* blocking op for bio */
     spinlock_t io_lock;     /* serialize DATA/NODE IOs */
     struct list_head io_list;   /* track fios */
     struct list_head bio_list;  /* bio entry list head */
     struct f2fs_rwsem bio_list_lock;    /* lock to protect bio entry list */
 };
 
 #define FDEV(i)             (sbi->devs[i])
 #define RDEV(i)             (raw_super->devs[i])
 struct f2fs_dev_info {
     struct block_device *bdev;
     char path[MAX_PATH_LEN];
     unsigned int total_segments;
     block_t start_blk;
     block_t end_blk;
 #ifdef CONFIG_BLK_DEV_ZONED
     unsigned int nr_blkz;       /* Total number of zones */
     unsigned long *blkz_seq;    /* Bitmap indicating sequential zones */
 #endif
 };
 
 enum inode_type {
     DIR_INODE,          /* for dirty dir inode */
     FILE_INODE,         /* for dirty regular/symlink inode */
     DIRTY_META,         /* for all dirtied inode metadata */
     ATOMIC_FILE,            /* for all atomic files */
     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 GC_AT */
 struct atgc_management {
     bool atgc_enabled;          /* ATGC is enabled or not */
     struct rb_root_cached root;     /* root of victim rb-tree */
     struct list_head victim_list;       /* linked with all victim entries */
     unsigned int victim_count;      /* victim count in rb-tree */
     unsigned int candidate_ratio;       /* candidate ratio */
     unsigned int max_candidate_count;   /* max candidate count */
     unsigned int age_weight;        /* age weight, vblock_weight = 100 - age_weight */
     unsigned long long age_threshold;   /* age threshold */
 };
 
 struct f2fs_gc_control {
     unsigned int victim_segno;  /* target victim segment number */
     int init_gc_type;       /* FG_GC or BG_GC */
     bool no_bg_gc;          /* check the space and stop bg_gc */
     bool should_migrate_blocks; /* should migrate blocks */
     bool err_gc_skipped;        /* return EAGAIN if GC skipped */
     unsigned int nr_free_secs;  /* # of free sections to do GC */
 };
 
 /* 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 */
     SBI_IS_SHUTDOWN,            /* shutdown by ioctl */
     SBI_IS_RECOVERED,           /* recovered orphan/data */
     SBI_CP_DISABLED,            /* CP was disabled last mount */
     SBI_CP_DISABLED_QUICK,          /* CP was disabled quickly */
     SBI_QUOTA_NEED_FLUSH,           /* need to flush quota info in CP */
     SBI_QUOTA_SKIP_FLUSH,           /* skip flushing quota in current CP */
     SBI_QUOTA_NEED_REPAIR,          /* quota file may be corrupted */
     SBI_IS_RESIZEFS,            /* resizefs is in process */
     SBI_IS_FREEZING,            /* freezefs is in process */
 };
 
 enum {
     CP_TIME,
     REQ_TIME,
     DISCARD_TIME,
     GC_TIME,
     DISABLE_TIME,
     UMOUNT_DISCARD_TIMEOUT,
     MAX_TIME,
 };
 
 enum {
     GC_NORMAL,
     GC_IDLE_CB,
     GC_IDLE_GREEDY,
     GC_IDLE_AT,
     GC_URGENT_HIGH,
     GC_URGENT_LOW,
     GC_URGENT_MID,
     MAX_GC_MODE,
 };
 
 enum {
     BGGC_MODE_ON,       /* background gc is on */
     BGGC_MODE_OFF,      /* background gc is off */
     BGGC_MODE_SYNC,     /*
                  * background gc is on, migrating blocks
                  * like foreground gc
                  */
 };
 
 enum {
     FS_MODE_ADAPTIVE,       /* use both lfs/ssr allocation */
     FS_MODE_LFS,            /* use lfs allocation only */
     FS_MODE_FRAGMENT_SEG,       /* segment fragmentation mode */
     FS_MODE_FRAGMENT_BLK,       /* block fragmentation mode */
 };
 
 enum {
     ALLOC_MODE_DEFAULT, /* stay default */
     ALLOC_MODE_REUSE,   /* reuse segments as much as possible */
 };
 
 enum fsync_mode {
     FSYNC_MODE_POSIX,   /* fsync follows posix semantics */
     FSYNC_MODE_STRICT,  /* fsync behaves in line with ext4 */
     FSYNC_MODE_NOBARRIER,   /* fsync behaves nobarrier based on posix */
 };
 
 enum {
     COMPR_MODE_FS,      /*
                  * automatically compress compression
                  * enabled files
                  */
     COMPR_MODE_USER,    /*
                  * automatical compression is disabled.
                  * user can control the file compression
                  * using ioctls
                  */
 };
 
 enum {
     DISCARD_UNIT_BLOCK, /* basic discard unit is block */
     DISCARD_UNIT_SEGMENT,   /* basic discard unit is segment */
     DISCARD_UNIT_SECTION,   /* basic discard unit is section */
 };
 
 enum {
     MEMORY_MODE_NORMAL, /* memory mode for normal devices */
     MEMORY_MODE_LOW,    /* memory mode for low memry devices */
 };
 
 
 
 static inline int f2fs_test_bit(unsigned int nr, char *addr);
 static inline void f2fs_set_bit(unsigned int nr, char *addr);
 static inline void f2fs_clear_bit(unsigned int nr, char *addr);
 
 /*
  * Layout of f2fs page.private:
  *
  * Layout A: lowest bit should be 1
  * | bit0 = 1 | bit1 | bit2 | ... | bit MAX | private data .... |
  * bit 0    PAGE_PRIVATE_NOT_POINTER
  * bit 1    PAGE_PRIVATE_ATOMIC_WRITE
  * bit 2    PAGE_PRIVATE_DUMMY_WRITE
  * bit 3    PAGE_PRIVATE_ONGOING_MIGRATION
  * bit 4    PAGE_PRIVATE_INLINE_INODE
  * bit 5    PAGE_PRIVATE_REF_RESOURCE
  * bit 6-   f2fs private data
  *
  * Layout B: lowest bit should be 0
  * page.private is a wrapped pointer.
  */
 enum {
     PAGE_PRIVATE_NOT_POINTER,       /* private contains non-pointer data */
     PAGE_PRIVATE_ATOMIC_WRITE,      /* data page from atomic write path */
     PAGE_PRIVATE_DUMMY_WRITE,       /* data page for padding aligned IO */
     PAGE_PRIVATE_ONGOING_MIGRATION,     /* data page which is on-going migrating */
     PAGE_PRIVATE_INLINE_INODE,      /* inode page contains inline data */
     PAGE_PRIVATE_REF_RESOURCE,      /* dirty page has referenced resources */
     PAGE_PRIVATE_MAX
 };
 
 #define PAGE_PRIVATE_GET_FUNC(name, flagname) \
 static inline bool page_private_##name(struct page *page) \
 { \
     return PagePrivate(page) && \
         test_bit(PAGE_PRIVATE_NOT_POINTER, &page_private(page)) && \
         test_bit(PAGE_PRIVATE_##flagname, &page_private(page)); \
 }
 
 #define PAGE_PRIVATE_SET_FUNC(name, flagname) \
 static inline void set_page_private_##name(struct page *page) \
 { \
     if (!PagePrivate(page)) { \
         get_page(page); \
         SetPagePrivate(page); \
         set_page_private(page, 0); \
     } \
     set_bit(PAGE_PRIVATE_NOT_POINTER, &page_private(page)); \
     set_bit(PAGE_PRIVATE_##flagname, &page_private(page)); \
 }
 
 #define PAGE_PRIVATE_CLEAR_FUNC(name, flagname) \
 static inline void clear_page_private_##name(struct page *page) \
 { \
     clear_bit(PAGE_PRIVATE_##flagname, &page_private(page)); \
     if (page_private(page) == 1 << PAGE_PRIVATE_NOT_POINTER) { \
         set_page_private(page, 0); \
         if (PagePrivate(page)) { \
             ClearPagePrivate(page); \
             put_page(page); \
         }\
     } \
 }
 
 PAGE_PRIVATE_GET_FUNC(nonpointer, NOT_POINTER);
 PAGE_PRIVATE_GET_FUNC(reference, REF_RESOURCE);
 PAGE_PRIVATE_GET_FUNC(inline, INLINE_INODE);
 PAGE_PRIVATE_GET_FUNC(gcing, ONGOING_MIGRATION);
 PAGE_PRIVATE_GET_FUNC(atomic, ATOMIC_WRITE);
 PAGE_PRIVATE_GET_FUNC(dummy, DUMMY_WRITE);
 
 PAGE_PRIVATE_SET_FUNC(reference, REF_RESOURCE);
 PAGE_PRIVATE_SET_FUNC(inline, INLINE_INODE);
 PAGE_PRIVATE_SET_FUNC(gcing, ONGOING_MIGRATION);
 PAGE_PRIVATE_SET_FUNC(atomic, ATOMIC_WRITE);
 PAGE_PRIVATE_SET_FUNC(dummy, DUMMY_WRITE);
 
 PAGE_PRIVATE_CLEAR_FUNC(reference, REF_RESOURCE);
 PAGE_PRIVATE_CLEAR_FUNC(inline, INLINE_INODE);
 PAGE_PRIVATE_CLEAR_FUNC(gcing, ONGOING_MIGRATION);
 PAGE_PRIVATE_CLEAR_FUNC(atomic, ATOMIC_WRITE);
 PAGE_PRIVATE_CLEAR_FUNC(dummy, DUMMY_WRITE);
 
 static inline unsigned long get_page_private_data(struct page *page)
 {
     unsigned long data = page_private(page);
 
     if (!test_bit(PAGE_PRIVATE_NOT_POINTER, &data))
         return 0;
     return data >> PAGE_PRIVATE_MAX;
 }
 
 static inline void set_page_private_data(struct page *page, unsigned long data)
 {
     if (!PagePrivate(page)) {
         get_page(page);
         SetPagePrivate(page);
         set_page_private(page, 0);
     }
     set_bit(PAGE_PRIVATE_NOT_POINTER, &page_private(page));
     page_private(page) |= data << PAGE_PRIVATE_MAX;
 }
 
 static inline void clear_page_private_data(struct page *page)
 {
     page_private(page) &= (1 << PAGE_PRIVATE_MAX) - 1;
     if (page_private(page) == 1 << PAGE_PRIVATE_NOT_POINTER) {
         set_page_private(page, 0);
         if (PagePrivate(page)) {
             ClearPagePrivate(page);
             put_page(page);
         }
     }
 }
 
 /* For compression */
 enum compress_algorithm_type {
     COMPRESS_LZO,
     COMPRESS_LZ4,
     COMPRESS_ZSTD,
     COMPRESS_LZORLE,
     COMPRESS_MAX,
 };
 
 enum compress_flag {
     COMPRESS_CHKSUM,
     COMPRESS_MAX_FLAG,
 };
 
 #define COMPRESS_WATERMARK          20
 #define COMPRESS_PERCENT            20
 
 #define COMPRESS_DATA_RESERVED_SIZE     4
 struct compress_data {
     __le32 clen;            /* compressed data size */
     __le32 chksum;          /* compressed data chksum */
     __le32 reserved[COMPRESS_DATA_RESERVED_SIZE];   /* reserved */
     u8 cdata[];         /* compressed data */
 };
 
 #define COMPRESS_HEADER_SIZE    (sizeof(struct compress_data))
 
 #define F2FS_COMPRESSED_PAGE_MAGIC  0xF5F2C000
 
 #define COMPRESS_LEVEL_OFFSET   8
 
 /* compress context */
 struct compress_ctx {
     struct inode *inode;        /* inode the context belong to */
     pgoff_t cluster_idx;        /* cluster index number */
     unsigned int cluster_size;  /* page count in cluster */
     unsigned int log_cluster_size;  /* log of cluster size */
     struct page **rpages;       /* pages store raw data in cluster */
     unsigned int nr_rpages;     /* total page number in rpages */
     struct page **cpages;       /* pages store compressed data in cluster */
     unsigned int nr_cpages;     /* total page number in cpages */
     unsigned int valid_nr_cpages;   /* valid page number in cpages */
     void *rbuf;         /* virtual mapped address on rpages */
     struct compress_data *cbuf; /* virtual mapped address on cpages */
     size_t rlen;            /* valid data length in rbuf */
     size_t clen;            /* valid data length in cbuf */
     void *private;          /* payload buffer for specified compression algorithm */
     void *private2;         /* extra payload buffer */
 };
 
 /* compress context for write IO path */
 struct compress_io_ctx {
     u32 magic;          /* magic number to indicate page is compressed */
     struct inode *inode;        /* inode the context belong to */
     struct page **rpages;       /* pages store raw data in cluster */
     unsigned int nr_rpages;     /* total page number in rpages */
     atomic_t pending_pages;     /* in-flight compressed page count */
 };
 
 /* Context for decompressing one cluster on the read IO path */
 struct decompress_io_ctx {
     u32 magic;          /* magic number to indicate page is compressed */
     struct inode *inode;        /* inode the context belong to */
     pgoff_t cluster_idx;        /* cluster index number */
     unsigned int cluster_size;  /* page count in cluster */
     unsigned int log_cluster_size;  /* log of cluster size */
     struct page **rpages;       /* pages store raw data in cluster */
     unsigned int nr_rpages;     /* total page number in rpages */
     struct page **cpages;       /* pages store compressed data in cluster */
     unsigned int nr_cpages;     /* total page number in cpages */
     struct page **tpages;       /* temp pages to pad holes in cluster */
     void *rbuf;         /* virtual mapped address on rpages */
     struct compress_data *cbuf; /* virtual mapped address on cpages */
     size_t rlen;            /* valid data length in rbuf */
     size_t clen;            /* valid data length in cbuf */
 
     /*
      * The number of compressed pages remaining to be read in this cluster.
      * This is initially nr_cpages.  It is decremented by 1 each time a page
      * has been read (or failed to be read).  When it reaches 0, the cluster
      * is decompressed (or an error is reported).
      *
      * If an error occurs before all the pages have been submitted for I/O,
      * then this will never reach 0.  In this case the I/O submitter is
      * responsible for calling f2fs_decompress_end_io() instead.
      */
     atomic_t remaining_pages;
 
     /*
      * Number of references to this decompress_io_ctx.
      *
      * One reference is held for I/O completion.  This reference is dropped
      * after the pagecache pages are updated and unlocked -- either after
      * decompression (and verity if enabled), or after an error.
      *
      * In addition, each compressed page holds a reference while it is in a
      * bio.  These references are necessary prevent compressed pages from
      * being freed while they are still in a bio.
      */
     refcount_t refcnt;
 
     bool failed;            /* IO error occurred before decompression? */
     bool need_verity;       /* need fs-verity verification after decompression? */
     void *private;          /* payload buffer for specified decompression algorithm */
     void *private2;         /* extra payload buffer */
     struct work_struct verity_work; /* work to verify the decompressed pages */
     struct work_struct free_work;   /* work for late free this structure itself */
 };
 
 #define NULL_CLUSTER            ((unsigned int)(~0))
 #define MIN_COMPRESS_LOG_SIZE       2
 #define MAX_COMPRESS_LOG_SIZE       8
 #define MAX_COMPRESS_WINDOW_SIZE(log_size)  ((PAGE_SIZE) << (log_size))
 
 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 */
     struct f2fs_rwsem sb_lock;      /* lock for raw super block */
     int valid_super_block;          /* valid super block no */
     unsigned long s_flag;               /* flags for sbi */
     struct mutex writepages;        /* mutex for writepages() */
 
 #ifdef CONFIG_BLK_DEV_ZONED
     unsigned int blocks_per_blkz;       /* F2FS blocks per zone */
     unsigned int log_blocks_per_blkz;   /* log2 F2FS blocks per zone */
 #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 *write_io[NR_PAGE_TYPE];   /* for write bios */
     /* keep migration IO order for LFS mode */
     struct f2fs_rwsem io_order_lock;
     mempool_t *write_io_dummy;      /* Dummy pages */
     pgoff_t page_eio_ofs[NR_PAGE_TYPE]; /* EIO page offset */
     int page_eio_cnt[NR_PAGE_TYPE];     /* EIO count */
 
     /* 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 f2fs_rwsem cp_global_sem;    /* checkpoint procedure lock */
     struct f2fs_rwsem cp_rwsem;     /* blocking FS operations */
     struct f2fs_rwsem node_write;       /* locking node writes */
     struct f2fs_rwsem node_change;  /* locking node change */
     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 ckpt_req_control cprc_info;  /* for checkpoint request control */
 
     struct inode_management im[MAX_INO_ENTRY];  /* manage inode cache */
 
     spinlock_t fsync_node_lock;     /* for node entry lock */
     struct list_head fsync_node_list;   /* node list head */
     unsigned int fsync_seg_id;      /* sequence id */
     unsigned int fsync_node_num;        /* number of node entries */
 
     /* 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 */
     struct mutex flush_lock;        /* for flush exclusion */
 
     /* for extent tree cache */
     struct radix_tree_root extent_tree_root;/* cache extent cache entries */
     struct mutex 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 unusable_blocks_per_sec;   /* unusable blocks per section */
     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 */
     int dir_level;              /* directory level */
     int readdir_ra;             /* readahead inode in readdir */
     u64 max_io_bytes;           /* max io bytes to merge IOs */
 
     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 */
     block_t reserved_blocks;        /* configurable reserved blocks */
     block_t current_reserved_blocks;    /* current reserved blocks */
 
     /* Additional tracking for no checkpoint mode */
     block_t unusable_block_count;       /* # of blocks saved by last cp */
 
     unsigned int nquota_files;      /* # of quota sysfile */
     struct f2fs_rwsem quota_sem;        /* blocking cp for flags */
 
     /* # of pages, see count_type */
     atomic_t nr_pages[NR_COUNT_TYPE];
     /* # of allocated blocks */
     struct percpu_counter alloc_valid_block_count;
     /* # of node block writes as roll forward recovery */
     struct percpu_counter rf_node_block_count;
 
     /* writeback control */
     atomic_t wb_sync_req[META]; /* count # of WB_SYNC threads */
 
     /* valid inode count */
     struct percpu_counter total_valid_inode_count;
 
     struct f2fs_mount_info mount_opt;   /* mount options */
 
     /* for cleaning operations */
     struct f2fs_rwsem gc_lock;      /*
                          * semaphore for GC, avoid
                          * race between GC and GC or CP
                          */
     struct f2fs_gc_kthread  *gc_thread; /* GC thread */
     struct atgc_management am;      /* atgc management */
     unsigned int cur_victim_sec;        /* current victim section num */
     unsigned int gc_mode;           /* current GC state */
     unsigned int next_victim_seg[2];    /* next segment in victim section */
     spinlock_t gc_urgent_high_lock;
     bool gc_urgent_high_limited;        /* indicates having limited trial count */
     unsigned int gc_urgent_high_remaining;  /* remaining trial count for GC_URGENT_HIGH */
 
     /* for skip statistic */
     unsigned int atomic_files;      /* # of opened atomic file */
     unsigned long long skipped_gc_rwsem;        /* FG_GC only */
 
     /* threshold for gc trials on pinned files */
     u64 gc_pin_file_threshold;
     struct f2fs_rwsem pin_sem;
 
     /* maximum # of trials to find a victim segment for SSR and GC */
     unsigned int max_victim_search;
     /* migration granularity of garbage collection, unit: segment */
     unsigned int migration_granularity;
 
     /*
      * 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 */
     atomic_t meta_count[META_MAX];      /* # of meta blocks */
     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 */
     atomic_t compr_inode;           /* # of compressed inodes */
     atomic64_t compr_blocks;        /* # of compressed blocks */
     atomic_t max_aw_cnt;            /* max # of atomic writes */
     unsigned int io_skip_bggc;      /* skip background gc for in-flight IO */
     unsigned int other_skip_bggc;       /* skip background gc for other reasons */
     unsigned int ndirty_inode[NR_INODE_TYPE];   /* # of dirty inodes */
 #endif
     spinlock_t stat_lock;           /* lock for stat operations */
 
     /* to attach REQ_META|REQ_FUA flags */
     unsigned int data_io_flag;
     unsigned int node_io_flag;
 
     /* For sysfs support */
     struct kobject s_kobj;          /* /sys/fs/f2fs/<devname> */
     struct completion s_kobj_unregister;
 
     struct kobject s_stat_kobj;     /* /sys/fs/f2fs/<devname>/stat */
     struct completion s_stat_kobj_unregister;
 
     struct kobject s_feature_list_kobj;     /* /sys/fs/f2fs/<devname>/feature_list */
     struct completion s_feature_list_kobj_unregister;
 
     /* For shrinker support */
     struct list_head s_list;
     struct mutex umount_mutex;
     unsigned int shrinker_run_no;
 
     /* For multi devices */
     int s_ndevs;                /* number of devices */
     struct f2fs_dev_info *devs;     /* for device list */
     unsigned int dirty_device;      /* for checkpoint data flush */
     spinlock_t dev_lock;            /* protect dirty_device */
     bool aligned_blksize;           /* all devices has the same logical blksize */
 
     /* For write statistics */
     u64 sectors_written_start;
     u64 kbytes_written;
 
     /* Reference to checksum algorithm driver via cryptoapi */
     struct crypto_shash *s_chksum_driver;
 
     /* Precomputed FS UUID checksum for seeding other checksums */
     __u32 s_chksum_seed;
 
     struct workqueue_struct *post_read_wq;  /* post read workqueue */
 
     struct kmem_cache *inline_xattr_slab;   /* inline xattr entry */
     unsigned int inline_xattr_slab_size;    /* default inline xattr slab size */
 
     /* For reclaimed segs statistics per each GC mode */
     unsigned int gc_segment_mode;       /* GC state for reclaimed segments */
     unsigned int gc_reclaimed_segs[MAX_GC_MODE];    /* Reclaimed segs for each mode */
 
     unsigned long seq_file_ra_mul;      /* multiplier for ra_pages of seq. files in fadvise */
 
     int max_fragment_chunk;         /* max chunk size for block fragmentation mode */
     int max_fragment_hole;          /* max hole size for block fragmentation mode */
 
     /* For atomic write statistics */
     atomic64_t current_atomic_write;
     s64 peak_atomic_write;
     u64 committed_atomic_block;
     u64 revoked_atomic_block;
 
 #ifdef CONFIG_F2FS_FS_COMPRESSION
     struct kmem_cache *page_array_slab; /* page array entry */
     unsigned int page_array_slab_size;  /* default page array slab size */
 
     /* For runtime compression statistics */
     u64 compr_written_block;
     u64 compr_saved_block;
     u32 compr_new_inode;
 
     /* For compressed block cache */
     struct inode *compress_inode;       /* cache compressed blocks */
     unsigned int compress_percent;      /* cache page percentage */
     unsigned int compress_watermark;    /* cache page watermark */
     atomic_t compress_page_hit;     /* cache hit count */
 #endif
 
 #ifdef CONFIG_F2FS_IOSTAT
     /* For app/fs IO statistics */
     spinlock_t iostat_lock;
     unsigned long long rw_iostat[NR_IO_TYPE];
     unsigned long long prev_rw_iostat[NR_IO_TYPE];
     bool iostat_enable;
     unsigned long iostat_next_period;
     unsigned int iostat_period_ms;
 
     /* For io latency related statistics info in one iostat period */
     spinlock_t iostat_lat_lock;
     struct iostat_lat_info *iostat_io_lat;
 #endif
 };
 
 #ifdef CONFIG_F2FS_FAULT_INJECTION
 #define f2fs_show_injection_info(sbi, type)                 \
     printk_ratelimited("%sF2FS-fs (%s) : inject %s in %s of %pS\n", \
         KERN_INFO, sbi->sb->s_id,               \
         f2fs_fault_name[type],                  \
         __func__, __builtin_return_address(0))
 static inline bool time_to_inject(struct f2fs_sb_info *sbi, int type)
 {
     struct f2fs_fault_info *ffi = &F2FS_OPTION(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);
         return true;
     }
     return false;
 }
 #else
 #define f2fs_show_injection_info(sbi, type) do { } while (0)
 static inline bool time_to_inject(struct f2fs_sb_info *sbi, int type)
 {
     return false;
 }
 #endif
 
 /*
  * Test if the mounted volume is a multi-device volume.
  *   - For a single regular disk volume, sbi->s_ndevs is 0.
  *   - For a single zoned disk volume, sbi->s_ndevs is 1.
  *   - For a multi-device volume, sbi->s_ndevs is always 2 or more.
  */
 static inline bool f2fs_is_multi_device(struct f2fs_sb_info *sbi)
 {
     return sbi->s_ndevs > 1;
 }
 
 static inline void f2fs_update_time(struct f2fs_sb_info *sbi, int type)
 {
     unsigned long now = jiffies;
 
     sbi->last_time[type] = now;
 
     /* DISCARD_TIME and GC_TIME are based on REQ_TIME */
     if (type == REQ_TIME) {
         sbi->last_time[DISCARD_TIME] = now;
         sbi->last_time[GC_TIME] = now;
     }
 }
 
 static inline bool f2fs_time_over(struct f2fs_sb_info *sbi, int type)
 {
     unsigned long interval = sbi->interval_time[type] * HZ;
 
     return time_after(jiffies, sbi->last_time[type] + interval);
 }
 
 static inline unsigned int f2fs_time_to_wait(struct f2fs_sb_info *sbi,
                         int type)
 {
     unsigned long interval = sbi->interval_time[type] * HZ;
     unsigned int wait_ms = 0;
     long delta;
 
     delta = (sbi->last_time[type] + interval) - jiffies;
     if (delta > 0)
         wait_ms = jiffies_to_msecs(delta);
 
     return wait_ms;
 }
 
 /*
  * Inline functions
  */
 static inline u32 __f2fs_crc32(struct f2fs_sb_info *sbi, u32 crc,
                   const void *address, unsigned int length)
 {
     struct {
         struct shash_desc shash;
         char ctx[4];
     } desc;
     int err;
 
     BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver) != sizeof(desc.ctx));
 
     desc.shash.tfm = sbi->s_chksum_driver;
     *(u32 *)desc.ctx = crc;
 
     err = crypto_shash_update(&desc.shash, address, length);
     BUG_ON(err);
 
     return *(u32 *)desc.ctx;
 }
 
 static inline u32 f2fs_crc32(struct f2fs_sb_info *sbi, const void *address,
                unsigned int length)
 {
     return __f2fs_crc32(sbi, F2FS_SUPER_MAGIC, address, length);
 }
 
 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 u32 f2fs_chksum(struct f2fs_sb_info *sbi, u32 crc,
                   const void *address, unsigned int length)
 {
     return __f2fs_crc32(sbi, crc, address, length);
 }
 
 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_file_mapping(page));
 }
 
 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 unsigned long f2fs_qf_ino(struct super_block *sb, int type)
 {
     if (type < F2FS_MAX_QUOTAS)
         return le32_to_cpu(F2FS_SB(sb)->raw_super->qf_ino[type]);
     return 0;
 }
 
 static inline __u64 cur_cp_crc(struct f2fs_checkpoint *cp)
 {
     size_t crc_offset = le32_to_cpu(cp->checksum_offset);
     return le32_to_cpu(*((__le32 *)((unsigned char *)cp + crc_offset)));
 }
 
 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)
 {
     unsigned long flags;
 
     spin_lock_irqsave(&sbi->cp_lock, flags);
     __set_ckpt_flags(F2FS_CKPT(sbi), f);
     spin_unlock_irqrestore(&sbi->cp_lock, flags);
 }
 
 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)
 {
     unsigned long flags;
 
     spin_lock_irqsave(&sbi->cp_lock, flags);
     __clear_ckpt_flags(F2FS_CKPT(sbi), f);
     spin_unlock_irqrestore(&sbi->cp_lock, flags);
 }
 
 #define init_f2fs_rwsem(sem)                    \
 do {                                \
     static struct lock_class_key __key;         \
                                 \
     __init_f2fs_rwsem((sem), #sem, &__key);         \
 } while (0)
 
 static inline void __init_f2fs_rwsem(struct f2fs_rwsem *sem,
         const char *sem_name, struct lock_class_key *key)
 {
     __init_rwsem(&sem->internal_rwsem, sem_name, key);
 #ifdef CONFIG_F2FS_UNFAIR_RWSEM
     init_waitqueue_head(&sem->read_waiters);
 #endif
 }
 
 static inline int f2fs_rwsem_is_locked(struct f2fs_rwsem *sem)
 {
     return rwsem_is_locked(&sem->internal_rwsem);
 }
 
 static inline int f2fs_rwsem_is_contended(struct f2fs_rwsem *sem)
 {
     return rwsem_is_contended(&sem->internal_rwsem);
 }
 
 static inline void f2fs_down_read(struct f2fs_rwsem *sem)
 {
 #ifdef CONFIG_F2FS_UNFAIR_RWSEM
     wait_event(sem->read_waiters, down_read_trylock(&sem->internal_rwsem));
 #else
     down_read(&sem->internal_rwsem);
 #endif
 }
 
 static inline int f2fs_down_read_trylock(struct f2fs_rwsem *sem)
 {
     return down_read_trylock(&sem->internal_rwsem);
 }
 
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 static inline void f2fs_down_read_nested(struct f2fs_rwsem *sem, int subclass)
 {
     down_read_nested(&sem->internal_rwsem, subclass);
 }
 #else
 #define f2fs_down_read_nested(sem, subclass) f2fs_down_read(sem)
 #endif
 
 static inline void f2fs_up_read(struct f2fs_rwsem *sem)
 {
     up_read(&sem->internal_rwsem);
 }
 
 static inline void f2fs_down_write(struct f2fs_rwsem *sem)
 {
     down_write(&sem->internal_rwsem);
 }
 
 static inline int f2fs_down_write_trylock(struct f2fs_rwsem *sem)
 {
     return down_write_trylock(&sem->internal_rwsem);
 }
 
 static inline void f2fs_up_write(struct f2fs_rwsem *sem)
 {
     up_write(&sem->internal_rwsem);
 #ifdef CONFIG_F2FS_UNFAIR_RWSEM
     wake_up_all(&sem->read_waiters);
 #endif
 }
 
 static inline void f2fs_lock_op(struct f2fs_sb_info *sbi)
 {
     f2fs_down_read(&sbi->cp_rwsem);
 }
 
 static inline int f2fs_trylock_op(struct f2fs_sb_info *sbi)
 {
     if (time_to_inject(sbi, FAULT_LOCK_OP)) {
         f2fs_show_injection_info(sbi, FAULT_LOCK_OP);
         return 0;
     }
     return f2fs_down_read_trylock(&sbi->cp_rwsem);
 }
 
 static inline void f2fs_unlock_op(struct f2fs_sb_info *sbi)
 {
     f2fs_up_read(&sbi->cp_rwsem);
 }
 
 static inline void f2fs_lock_all(struct f2fs_sb_info *sbi)
 {
     f2fs_down_write(&sbi->cp_rwsem);
 }
 
 static inline void f2fs_unlock_all(struct f2fs_sb_info *sbi)
 {
     f2fs_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 | 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 inode has blocks or not
  */
 static inline int F2FS_HAS_BLOCKS(struct inode *inode)
 {
     block_t xattr_block = F2FS_I(inode)->i_xattr_nid ? 1 : 0;
 
     return (inode->i_blocks >> F2FS_LOG_SECTORS_PER_BLOCK) > xattr_block;
 }
 
 static inline bool f2fs_has_xattr_block(unsigned int ofs)
 {
     return ofs == XATTR_NODE_OFFSET;
 }
 
 static inline bool __allow_reserved_blocks(struct f2fs_sb_info *sbi,
                     struct inode *inode, bool cap)
 {
     if (!inode)
         return true;
     if (!test_opt(sbi, RESERVE_ROOT))
         return false;
     if (IS_NOQUOTA(inode))
         return true;
     if (uid_eq(F2FS_OPTION(sbi).s_resuid, current_fsuid()))
         return true;
     if (!gid_eq(F2FS_OPTION(sbi).s_resgid, GLOBAL_ROOT_GID) &&
                     in_group_p(F2FS_OPTION(sbi).s_resgid))
         return true;
     if (cap && capable(CAP_SYS_RESOURCE))
         return true;
     return false;
 }
 
 static inline void f2fs_i_blocks_write(struct inode *, block_t, bool, bool);
 static inline int inc_valid_block_count(struct f2fs_sb_info *sbi,
                  struct inode *inode, blkcnt_t *count)
 {
     blkcnt_t diff = 0, release = 0;
     block_t avail_user_block_count;
     int ret;
 
     ret = dquot_reserve_block(inode, *count);
     if (ret)
         return ret;
 
     if (time_to_inject(sbi, FAULT_BLOCK)) {
         f2fs_show_injection_info(sbi, FAULT_BLOCK);
         release = *count;
         goto release_quota;
     }
 
     /*
      * 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);
     avail_user_block_count = sbi->user_block_count -
                     sbi->current_reserved_blocks;
 
     if (!__allow_reserved_blocks(sbi, inode, true))
         avail_user_block_count -= F2FS_OPTION(sbi).root_reserved_blocks;
 
     if (F2FS_IO_ALIGNED(sbi))
         avail_user_block_count -= sbi->blocks_per_seg *
                 SM_I(sbi)->additional_reserved_segments;
 
     if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED))) {
         if (avail_user_block_count > sbi->unusable_block_count)
             avail_user_block_count -= sbi->unusable_block_count;
         else
             avail_user_block_count = 0;
     }
     if (unlikely(sbi->total_valid_block_count > avail_user_block_count)) {
         diff = sbi->total_valid_block_count - avail_user_block_count;
         if (diff > *count)
             diff = *count;
         *count -= diff;
         release = diff;
         sbi->total_valid_block_count -= diff;
         if (!*count) {
             spin_unlock(&sbi->stat_lock);
             goto enospc;
         }
     }
     spin_unlock(&sbi->stat_lock);
 
     if (unlikely(release)) {
         percpu_counter_sub(&sbi->alloc_valid_block_count, release);
         dquot_release_reservation_block(inode, release);
     }
     f2fs_i_blocks_write(inode, *count, true, true);
     return 0;
 
 enospc:
     percpu_counter_sub(&sbi->alloc_valid_block_count, release);
 release_quota:
     dquot_release_reservation_block(inode, release);
     return -ENOSPC;
 }
 
 __printf(2, 3)
 void f2fs_printk(struct f2fs_sb_info *sbi, const char *fmt, ...);
 
 #define f2fs_err(sbi, fmt, ...)                     \
     f2fs_printk(sbi, KERN_ERR fmt, ##__VA_ARGS__)
 #define f2fs_warn(sbi, fmt, ...)                    \
     f2fs_printk(sbi, KERN_WARNING fmt, ##__VA_ARGS__)
 #define f2fs_notice(sbi, fmt, ...)                  \
     f2fs_printk(sbi, KERN_NOTICE fmt, ##__VA_ARGS__)
 #define f2fs_info(sbi, fmt, ...)                    \
     f2fs_printk(sbi, KERN_INFO fmt, ##__VA_ARGS__)
 #define f2fs_debug(sbi, fmt, ...)                   \
     f2fs_printk(sbi, KERN_DEBUG fmt, ##__VA_ARGS__)
 
 static inline void dec_valid_block_count(struct f2fs_sb_info *sbi,
                         struct inode *inode,
                         block_t count)
 {
     blkcnt_t sectors = count << F2FS_LOG_SECTORS_PER_BLOCK;
 
     spin_lock(&sbi->stat_lock);
     f2fs_bug_on(sbi, sbi->total_valid_block_count < (block_t) count);
     sbi->total_valid_block_count -= (block_t)count;
     if (sbi->reserved_blocks &&
         sbi->current_reserved_blocks < sbi->reserved_blocks)
         sbi->current_reserved_blocks = min(sbi->reserved_blocks,
                     sbi->current_reserved_blocks + count);
     spin_unlock(&sbi->stat_lock);
     if (unlikely(inode->i_blocks < sectors)) {
         f2fs_warn(sbi, "Inconsistent i_blocks, ino:%lu, iblocks:%llu, sectors:%llu",
               inode->i_ino,
               (unsigned long long)inode->i_blocks,
               (unsigned long long)sectors);
         set_sbi_flag(sbi, SBI_NEED_FSCK);
         return;
     }
     f2fs_i_blocks_write(inode, count, false, true);
 }
 
 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_DENTS ||
             count_type == F2FS_DIRTY_NODES ||
             count_type == F2FS_DIRTY_META ||
             count_type == F2FS_DIRTY_QDATA ||
             count_type == F2FS_DIRTY_IMETA)
         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);
     if (IS_NOQUOTA(inode))
         inc_page_count(F2FS_I_SB(inode), F2FS_DIRTY_QDATA);
 }
 
 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);
     if (IS_NOQUOTA(inode))
         dec_page_count(F2FS_I_SB(inode), F2FS_DIRTY_QDATA);
 }
 
 static inline void inc_atomic_write_cnt(struct inode *inode)
 {
     struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
     struct f2fs_inode_info *fi = F2FS_I(inode);
     u64 current_write;
 
     fi->atomic_write_cnt++;
     atomic64_inc(&sbi->current_atomic_write);
     current_write = atomic64_read(&sbi->current_atomic_write);
     if (current_write > sbi->peak_atomic_write)
         sbi->peak_atomic_write = current_write;
 }
 
 static inline void release_atomic_write_cnt(struct inode *inode)
 {
     struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
     struct f2fs_inode_info *fi = F2FS_I(inode);
 
     atomic64_sub(fi->atomic_write_cnt, &sbi->current_atomic_write);
     fi->atomic_write_cnt = 0;
 }
 
 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);
     void *tmp_ptr = &ckpt->sit_nat_version_bitmap;
     int offset;
 
     if (is_set_ckpt_flags(sbi, CP_LARGE_NAT_BITMAP_FLAG)) {
         offset = (flag == SIT_BITMAP) ?
             le32_to_cpu(ckpt->nat_ver_bitmap_bytesize) : 0;
         /*
          * if large_nat_bitmap feature is enabled, leave checksum
          * protection for all nat/sit bitmaps.
          */
         return tmp_ptr + offset + sizeof(__le32);
     }
 
     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 tmp_ptr + 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 int inc_valid_node_count(struct f2fs_sb_info *sbi,
                     struct inode *inode, bool is_inode)
 {
     block_t valid_block_count;
     unsigned int valid_node_count, user_block_count;
     int err;
 
     if (is_inode) {
         if (inode) {
             err = dquot_alloc_inode(inode);
             if (err)
                 return err;
         }
     } else {
         err = dquot_reserve_block(inode, 1);
         if (err)
             return err;
     }
 
     if (time_to_inject(sbi, FAULT_BLOCK)) {
         f2fs_show_injection_info(sbi, FAULT_BLOCK);
         goto enospc;
     }
 
     spin_lock(&sbi->stat_lock);
 
     valid_block_count = sbi->total_valid_block_count +
                     sbi->current_reserved_blocks + 1;
 
     if (!__allow_reserved_blocks(sbi, inode, false))
         valid_block_count += F2FS_OPTION(sbi).root_reserved_blocks;
 
     if (F2FS_IO_ALIGNED(sbi))
         valid_block_count += sbi->blocks_per_seg *
                 SM_I(sbi)->additional_reserved_segments;
 
     user_block_count = sbi->user_block_count;
     if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED)))
         user_block_count -= sbi->unusable_block_count;
 
     if (unlikely(valid_block_count > user_block_count)) {
         spin_unlock(&sbi->stat_lock);
         goto enospc;
     }
 
     valid_node_count = sbi->total_valid_node_count + 1;
     if (unlikely(valid_node_count > sbi->total_node_count)) {
         spin_unlock(&sbi->stat_lock);
         goto enospc;
     }
 
     sbi->total_valid_node_count++;
     sbi->total_valid_block_count++;
     spin_unlock(&sbi->stat_lock);
 
     if (inode) {
         if (is_inode)
             f2fs_mark_inode_dirty_sync(inode, true);
         else
             f2fs_i_blocks_write(inode, 1, true, true);
     }
 
     percpu_counter_inc(&sbi->alloc_valid_block_count);
     return 0;
 
 enospc:
     if (is_inode) {
         if (inode)
             dquot_free_inode(inode);
     } else {
         dquot_release_reservation_block(inode, 1);
     }
     return -ENOSPC;
 }
 
 static inline void dec_valid_node_count(struct f2fs_sb_info *sbi,
                     struct inode *inode, bool is_inode)
 {
     spin_lock(&sbi->stat_lock);
 
     if (unlikely(!sbi->total_valid_block_count ||
             !sbi->total_valid_node_count)) {
         f2fs_warn(sbi, "dec_valid_node_count: inconsistent block counts, total_valid_block:%u, total_valid_node:%u",
               sbi->total_valid_block_count,
               sbi->total_valid_node_count);
         set_sbi_flag(sbi, SBI_NEED_FSCK);
     } else {
         sbi->total_valid_block_count--;
         sbi->total_valid_node_count--;
     }
 
     if (sbi->reserved_blocks &&
         sbi->current_reserved_blocks < sbi->reserved_blocks)
         sbi->current_reserved_blocks++;
 
     spin_unlock(&sbi->stat_lock);
 
     if (is_inode) {
         dquot_free_inode(inode);
     } else {
         if (unlikely(inode->i_blocks == 0)) {
             f2fs_warn(sbi, "dec_valid_node_count: inconsistent i_blocks, ino:%lu, iblocks:%llu",
                   inode->i_ino,
                   (unsigned long long)inode->i_blocks);
             set_sbi_flag(sbi, SBI_NEED_FSCK);
             return;
         }
         f2fs_i_blocks_write(inode, 1, false, true);
     }
 }
 
 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)
 {
     struct page *page;
     unsigned int flags;
 
     if (IS_ENABLED(CONFIG_F2FS_FAULT_INJECTION)) {
         if (!for_write)
             page = find_get_page_flags(mapping, index,
                             FGP_LOCK | FGP_ACCESSED);
         else
             page = find_lock_page(mapping, index);
         if (page)
             return page;
 
         if (time_to_inject(F2FS_M_SB(mapping), FAULT_PAGE_ALLOC)) {
             f2fs_show_injection_info(F2FS_M_SB(mapping),
                             FAULT_PAGE_ALLOC);
             return NULL;
         }
     }
 
     if (!for_write)
         return grab_cache_page(mapping, index);
 
     flags = memalloc_nofs_save();
     page = grab_cache_page_write_begin(mapping, index);
     memalloc_nofs_restore(flags);
 
     return page;
 }
 
 static inline struct page *f2fs_pagecache_get_page(
                 struct address_space *mapping, pgoff_t index,
                 int fgp_flags, gfp_t gfp_mask)
 {
     if (time_to_inject(F2FS_M_SB(mapping), FAULT_PAGE_GET)) {
         f2fs_show_injection_info(F2FS_M_SB(mapping), FAULT_PAGE_GET);
         return NULL;
     }
 
     return pagecache_get_page(mapping, index, fgp_flags, gfp_mask);
 }
 
 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_nofail(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 void *f2fs_kmem_cache_alloc(struct kmem_cache *cachep,
             gfp_t flags, bool nofail, struct f2fs_sb_info *sbi)
 {
     if (nofail)
         return f2fs_kmem_cache_alloc_nofail(cachep, flags);
 
     if (time_to_inject(sbi, FAULT_SLAB_ALLOC)) {
         f2fs_show_injection_info(sbi, FAULT_SLAB_ALLOC);
         return NULL;
     }
 
     return kmem_cache_alloc(cachep, flags);
 }
 
 static inline bool is_inflight_io(struct f2fs_sb_info *sbi, int type)
 {
     if (get_pages(sbi, F2FS_RD_DATA) || get_pages(sbi, F2FS_RD_NODE) ||
         get_pages(sbi, F2FS_RD_META) || get_pages(sbi, F2FS_WB_DATA) ||
         get_pages(sbi, F2FS_WB_CP_DATA) ||
         get_pages(sbi, F2FS_DIO_READ) ||
         get_pages(sbi, F2FS_DIO_WRITE))
         return true;
 
     if (type != DISCARD_TIME && SM_I(sbi) && SM_I(sbi)->dcc_info &&
             atomic_read(&SM_I(sbi)->dcc_info->queued_discard))
         return true;
 
     if (SM_I(sbi) && SM_I(sbi)->fcc_info &&
             atomic_read(&SM_I(sbi)->fcc_info->queued_flush))
         return true;
     return false;
 }
 
 static inline bool is_idle(struct f2fs_sb_info *sbi, int type)
 {
     if (sbi->gc_mode == GC_URGENT_HIGH)
         return true;
 
     if (is_inflight_io(sbi, type))
         return false;
 
     if (sbi->gc_mode == GC_URGENT_MID)
         return true;
 
     if (sbi->gc_mode == GC_URGENT_LOW &&
             (type == DISCARD_TIME || type == GC_TIME))
         return true;
 
     return f2fs_time_over(sbi, type);
 }
 
 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 int offset_in_addr(struct f2fs_inode *i)
 {
     return (i->i_inline & F2FS_EXTRA_ATTR) ?
             (le16_to_cpu(i->i_extra_isize) / sizeof(__le32)) : 0;
 }
 
 static inline __le32 *blkaddr_in_node(struct f2fs_node *node)
 {
     return RAW_IS_INODE(node) ? node->i.i_addr : node->dn.addr;
 }
 
 static inline int f2fs_has_extra_attr(struct inode *inode);
 static inline block_t data_blkaddr(struct inode *inode,
             struct page *node_page, unsigned int offset)
 {
     struct f2fs_node *raw_node;
     __le32 *addr_array;
     int base = 0;
     bool is_inode = IS_INODE(node_page);
 
     raw_node = F2FS_NODE(node_page);
 
     if (is_inode) {
         if (!inode)
             /* from GC path only */
             base = offset_in_addr(&raw_node->i);
         else if (f2fs_has_extra_attr(inode))
             base = get_extra_isize(inode);
     }
 
     addr_array = blkaddr_in_node(raw_node);
     return le32_to_cpu(addr_array[base + offset]);
 }
 
 static inline block_t f2fs_data_blkaddr(struct dnode_of_data *dn)
 {
     return data_blkaddr(dn->inode, dn->node_page, dn->ofs_in_node);
 }
 
 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;
 }
 
 /*
  * On-disk inode flags (f2fs_inode::i_flags)
  */
 #define F2FS_COMPR_FL           0x00000004 /* Compress file */
 #define F2FS_SYNC_FL            0x00000008 /* Synchronous updates */
 #define F2FS_IMMUTABLE_FL       0x00000010 /* Immutable file */
 #define F2FS_APPEND_FL          0x00000020 /* writes to file may only append */
 #define F2FS_NODUMP_FL          0x00000040 /* do not dump file */
 #define F2FS_NOATIME_FL         0x00000080 /* do not update atime */
 #define F2FS_NOCOMP_FL          0x00000400 /* Don't compress */
 #define F2FS_INDEX_FL           0x00001000 /* hash-indexed directory */
 #define F2FS_DIRSYNC_FL         0x00010000 /* dirsync behaviour (directories only) */
 #define F2FS_PROJINHERIT_FL     0x20000000 /* Create with parents projid */
 #define F2FS_CASEFOLD_FL        0x40000000 /* Casefolded file */
 
 /* Flags that should be inherited by new inodes from their parent. */
 #define F2FS_FL_INHERITED (F2FS_SYNC_FL | F2FS_NODUMP_FL | F2FS_NOATIME_FL | \
                F2FS_DIRSYNC_FL | F2FS_PROJINHERIT_FL | \
                F2FS_CASEFOLD_FL | F2FS_COMPR_FL | F2FS_NOCOMP_FL)
 
 /* Flags that are appropriate for regular files (all but dir-specific ones). */
 #define F2FS_REG_FLMASK     (~(F2FS_DIRSYNC_FL | F2FS_PROJINHERIT_FL | \
                 F2FS_CASEFOLD_FL))
 
 /* Flags that are appropriate for non-directories/regular files. */
 #define F2FS_OTHER_FLMASK   (F2FS_NODUMP_FL | F2FS_NOATIME_FL)
 
 static inline __u32 f2fs_mask_flags(umode_t mode, __u32 flags)
 {
     if (S_ISDIR(mode))
         return flags;
     else if (S_ISREG(mode))
         return flags & F2FS_REG_FLMASK;
     else
         return flags & F2FS_OTHER_FLMASK;
 }
 
 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:
     case FI_NEW_INODE:
         if (set)
             return;
         fallthrough;
     case FI_DATA_EXIST:
     case FI_INLINE_DOTS:
     case FI_PIN_FILE:
     case FI_COMPRESS_RELEASED:
         f2fs_mark_inode_dirty_sync(inode, true);
     }
 }
 
 static inline void set_inode_flag(struct inode *inode, int flag)
 {
     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)
 {
     clear_bit(flag, F2FS_I(inode)->flags);
     __mark_inode_dirty_flag(inode, flag, false);
 }
 
 static inline bool f2fs_verity_in_progress(struct inode *inode)
 {
     return IS_ENABLED(CONFIG_FS_VERITY) &&
            is_inode_flag_set(inode, FI_VERITY_IN_PROGRESS);
 }
 
 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, false);
 }
 
 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, true);
 }
 
 static inline void f2fs_i_blocks_write(struct inode *inode,
                     block_t diff, bool add, bool claim)
 {
     bool clean = !is_inode_flag_set(inode, FI_DIRTY_INODE);
     bool recover = is_inode_flag_set(inode, FI_AUTO_RECOVER);
 
     /* add = 1, claim = 1 should be dquot_reserve_block in pair */
     if (add) {
         if (claim)
             dquot_claim_block(inode, diff);
         else
             dquot_alloc_block_nofail(inode, diff);
     } else {
         dquot_free_block(inode, diff);
     }
 
     f2fs_mark_inode_dirty_sync(inode, true);
     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, true);
     if (clean || recover)
         set_inode_flag(inode, FI_AUTO_RECOVER);
 }
 
 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, true);
 }
 
 static inline void f2fs_i_gc_failures_write(struct inode *inode,
                     unsigned int count)
 {
     F2FS_I(inode)->i_gc_failures[GC_FAILURE_PIN] = count;
     f2fs_mark_inode_dirty_sync(inode, true);
 }
 
 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, true);
 }
 
 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, true);
 }
 
 static inline void get_inline_info(struct inode *inode, struct f2fs_inode *ri)
 {
     struct f2fs_inode_info *fi = F2FS_I(inode);
 
     if (ri->i_inline & F2FS_INLINE_XATTR)
         set_bit(FI_INLINE_XATTR, fi->flags);
     if (ri->i_inline & F2FS_INLINE_DATA)
         set_bit(FI_INLINE_DATA, fi->flags);
     if (ri->i_inline & F2FS_INLINE_DENTRY)
         set_bit(FI_INLINE_DENTRY, fi->flags);
     if (ri->i_inline & F2FS_DATA_EXIST)
         set_bit(FI_DATA_EXIST, fi->flags);
     if (ri->i_inline & F2FS_INLINE_DOTS)
         set_bit(FI_INLINE_DOTS, fi->flags);
     if (ri->i_inline & F2FS_EXTRA_ATTR)
         set_bit(FI_EXTRA_ATTR, fi->flags);
     if (ri->i_inline & F2FS_PIN_FILE)
         set_bit(FI_PIN_FILE, fi->flags);
     if (ri->i_inline & F2FS_COMPRESS_RELEASED)
         set_bit(FI_COMPRESS_RELEASED, fi->flags);
 }
 
 static inline void set_raw_inline(struct inode *inode, struct f2fs_inode *ri)
 {
     ri->i_inline = 0;
 
     if (is_inode_flag_set(inode, FI_INLINE_XATTR))
         ri->i_inline |= F2FS_INLINE_XATTR;
     if (is_inode_flag_set(inode, FI_INLINE_DATA))
         ri->i_inline |= F2FS_INLINE_DATA;
     if (is_inode_flag_set(inode, FI_INLINE_DENTRY))
         ri->i_inline |= F2FS_INLINE_DENTRY;
     if (is_inode_flag_set(inode, FI_DATA_EXIST))
         ri->i_inline |= F2FS_DATA_EXIST;
     if (is_inode_flag_set(inode, FI_INLINE_DOTS))
         ri->i_inline |= F2FS_INLINE_DOTS;
     if (is_inode_flag_set(inode, FI_EXTRA_ATTR))
         ri->i_inline |= F2FS_EXTRA_ATTR;
     if (is_inode_flag_set(inode, FI_PIN_FILE))
         ri->i_inline |= F2FS_PIN_FILE;
     if (is_inode_flag_set(inode, FI_COMPRESS_RELEASED))
         ri->i_inline |= F2FS_COMPRESS_RELEASED;
 }
 
 static inline int f2fs_has_extra_attr(struct inode *inode)
 {
     return is_inode_flag_set(inode, FI_EXTRA_ATTR);
 }
 
 static inline int f2fs_has_inline_xattr(struct inode *inode)
 {
     return is_inode_flag_set(inode, FI_INLINE_XATTR);
 }
 
 static inline int f2fs_compressed_file(struct inode *inode)
 {
     return S_ISREG(inode->i_mode) &&
         is_inode_flag_set(inode, FI_COMPRESSED_FILE);
 }
 
 static inline bool f2fs_need_compress_data(struct inode *inode)
 {
     int compress_mode = F2FS_OPTION(F2FS_I_SB(inode)).compress_mode;
 
     if (!f2fs_compressed_file(inode))
         return false;
 
     if (compress_mode == COMPR_MODE_FS)
         return true;
     else if (compress_mode == COMPR_MODE_USER &&
             is_inode_flag_set(inode, FI_ENABLE_COMPRESS))
         return true;
 
     return false;
 }
 
 static inline unsigned int addrs_per_inode(struct inode *inode)
 {
     unsigned int addrs = CUR_ADDRS_PER_INODE(inode) -
                 get_inline_xattr_addrs(inode);
 
     if (!f2fs_compressed_file(inode))
         return addrs;
     return ALIGN_DOWN(addrs, F2FS_I(inode)->i_cluster_size);
 }
 
 static inline unsigned int addrs_per_block(struct inode *inode)
 {
     if (!f2fs_compressed_file(inode))
         return DEF_ADDRS_PER_BLOCK;
     return ALIGN_DOWN(DEF_ADDRS_PER_BLOCK, F2FS_I(inode)->i_cluster_size);
 }
 
 static inline void *inline_xattr_addr(struct inode *inode, struct page *page)
 {
     struct f2fs_inode *ri = F2FS_INODE(page);
 
     return (void *)&(ri->i_addr[DEF_ADDRS_PER_INODE -
                     get_inline_xattr_addrs(inode)]);
 }
 
 static inline int inline_xattr_size(struct inode *inode)
 {
     if (f2fs_has_inline_xattr(inode))
         return get_inline_xattr_addrs(inode) * sizeof(__le32);
     return 0;
 }
 
 /*
  * Notice: check inline_data flag without inode page lock is unsafe.
  * It could change at any time by f2fs_convert_inline_page().
  */
 static inline int f2fs_has_inline_data(struct inode *inode)
 {
     return is_inode_flag_set(inode, FI_INLINE_DATA);
 }
 
 static inline int f2fs_exist_data(struct inode *inode)
 {
     return is_inode_flag_set(inode, FI_DATA_EXIST);
 }
 
 static inline int f2fs_has_inline_dots(struct inode *inode)
 {
     return is_inode_flag_set(inode, FI_INLINE_DOTS);
 }
 
 static inline int f2fs_is_mmap_file(struct inode *inode)
 {
     return is_inode_flag_set(inode, FI_MMAP_FILE);
 }
 
 static inline bool f2fs_is_pinned_file(struct inode *inode)
 {
     return is_inode_flag_set(inode, FI_PIN_FILE);
 }
 
 static inline bool f2fs_is_atomic_file(struct inode *inode)
 {
     return is_inode_flag_set(inode, FI_ATOMIC_FILE);
 }
 
 static inline bool f2fs_is_cow_file(struct inode *inode)
 {
     return is_inode_flag_set(inode, FI_COW_FILE);
 }
 
 static inline bool f2fs_is_first_block_written(struct inode *inode)
 {
     return is_inode_flag_set(inode, FI_FIRST_BLOCK_WRITTEN);
 }
 
 static inline bool f2fs_is_drop_cache(struct inode *inode)
 {
     return is_inode_flag_set(inode, FI_DROP_CACHE);
 }
 
 static inline void *inline_data_addr(struct inode *inode, struct page *page)
 {
     struct f2fs_inode *ri = F2FS_INODE(page);
     int extra_size = get_extra_isize(inode);
 
     return (void *)&(ri->i_addr[extra_size + DEF_INLINE_RESERVED_SIZE]);
 }
 
 static inline int f2fs_has_inline_dentry(struct inode *inode)
 {
     return is_inode_flag_set(inode, FI_INLINE_DENTRY);
 }
 
 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)
 {
     if (is_file(inode, type))
         return;
     F2FS_I(inode)->i_advise |= type;
     f2fs_mark_inode_dirty_sync(inode, true);
 }
 
 static inline void clear_file(struct inode *inode, int type)
 {
     if (!is_file(inode, type))
         return;
     F2FS_I(inode)->i_advise &= ~type;
     f2fs_mark_inode_dirty_sync(inode, true);
 }
 
 static inline bool f2fs_is_time_consistent(struct inode *inode)
 {
     if (!timespec64_equal(F2FS_I(inode)->i_disk_time, &inode->i_atime))
         return false;
     if (!timespec64_equal(F2FS_I(inode)->i_disk_time + 1, &inode->i_ctime))
         return false;
     if (!timespec64_equal(F2FS_I(inode)->i_disk_time + 2, &inode->i_mtime))
         return false;
     if (!timespec64_equal(F2FS_I(inode)->i_disk_time + 3,
                         &F2FS_I(inode)->i_crtime))
         return false;
     return true;
 }
 
 static inline bool f2fs_skip_inode_update(struct inode *inode, int dsync)
 {
     bool ret;
 
     if (dsync) {
         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 
         spin_lock(&sbi->inode_lock[DIRTY_META]);
         ret = list_empty(&F2FS_I(inode)->gdirty_list);
         spin_unlock(&sbi->inode_lock[DIRTY_META]);
         return ret;
     }
     if (!is_inode_flag_set(inode, FI_AUTO_RECOVER) ||
             file_keep_isize(inode) ||
             i_size_read(inode) & ~PAGE_MASK)
         return false;
 
     if (!f2fs_is_time_consistent(inode))
         return false;
 
     spin_lock(&F2FS_I(inode)->i_size_lock);
     ret = F2FS_I(inode)->last_disk_size == i_size_read(inode);
     spin_unlock(&F2FS_I(inode)->i_size_lock);
 
     return ret;
 }
 
 static inline bool f2fs_readonly(struct super_block *sb)
 {
     return sb_rdonly(sb);
 }
 
 static inline bool f2fs_cp_error(struct f2fs_sb_info *sbi)
 {
     return is_set_ckpt_flags(sbi, CP_ERROR_FLAG);
 }
 
 static inline bool is_dot_dotdot(const u8 *name, size_t len)
 {
     if (len == 1 && name[0] == '.')
         return true;
 
     if (len == 2 && name[0] == '.' && name[1] == '.')
         return true;
 
     return false;
 }
 
 static inline void *f2fs_kmalloc(struct f2fs_sb_info *sbi,
                     size_t size, gfp_t flags)
 {
     if (time_to_inject(sbi, FAULT_KMALLOC)) {
         f2fs_show_injection_info(sbi, FAULT_KMALLOC);
         return NULL;
     }
 
     return kmalloc(size, flags);
 }
 
 static inline void *f2fs_kzalloc(struct f2fs_sb_info *sbi,
                     size_t size, gfp_t flags)
 {
     return f2fs_kmalloc(sbi, size, flags | __GFP_ZERO);
 }
 
 static inline void *f2fs_kvmalloc(struct f2fs_sb_info *sbi,
                     size_t size, gfp_t flags)
 {
     if (time_to_inject(sbi, FAULT_KVMALLOC)) {
         f2fs_show_injection_info(sbi, FAULT_KVMALLOC);
         return NULL;
     }
 
     return kvmalloc(size, flags);
 }
 
 static inline void *f2fs_kvzalloc(struct f2fs_sb_info *sbi,
                     size_t size, gfp_t flags)
 {
     return f2fs_kvmalloc(sbi, size, flags | __GFP_ZERO);
 }
 
 static inline int get_extra_isize(struct inode *inode)
 {
     return F2FS_I(inode)->i_extra_isize / sizeof(__le32);
 }
 
 static inline int get_inline_xattr_addrs(struct inode *inode)
 {
     return F2FS_I(inode)->i_inline_xattr_size;
 }
 
 #define f2fs_get_inode_mode(i) \
     ((is_inode_flag_set(i, FI_ACL_MODE)) ? \
      (F2FS_I(i)->i_acl_mode) : ((i)->i_mode))
 
 #define F2FS_TOTAL_EXTRA_ATTR_SIZE          \
     (offsetof(struct f2fs_inode, i_extra_end) - \
     offsetof(struct f2fs_inode, i_extra_isize)) \
 
 #define F2FS_OLD_ATTRIBUTE_SIZE (offsetof(struct f2fs_inode, i_addr))
 #define F2FS_FITS_IN_INODE(f2fs_inode, extra_isize, field)      \
         ((offsetof(typeof(*(f2fs_inode)), field) +  \
         sizeof((f2fs_inode)->field))            \
         <= (F2FS_OLD_ATTRIBUTE_SIZE + (extra_isize)))   \
 
 #define __is_large_section(sbi)     ((sbi)->segs_per_sec > 1)
 
 #define __is_meta_io(fio) (PAGE_TYPE_OF_BIO((fio)->type) == META)
 
 bool f2fs_is_valid_blkaddr(struct f2fs_sb_info *sbi,
                     block_t blkaddr, int type);
 static inline void verify_blkaddr(struct f2fs_sb_info *sbi,
                     block_t blkaddr, int type)
 {
     if (!f2fs_is_valid_blkaddr(sbi, blkaddr, type)) {
         f2fs_err(sbi, "invalid blkaddr: %u, type: %d, run fsck to fix.",
              blkaddr, type);
         f2fs_bug_on(sbi, 1);
     }
 }
 
 static inline bool __is_valid_data_blkaddr(block_t blkaddr)
 {
     if (blkaddr == NEW_ADDR || blkaddr == NULL_ADDR ||
             blkaddr == COMPRESS_ADDR)
         return false;
     return true;
 }
 
 /*
  * file.c
  */
 int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
 void f2fs_truncate_data_blocks(struct dnode_of_data *dn);
 int f2fs_do_truncate_blocks(struct inode *inode, u64 from, bool lock);
 int f2fs_truncate_blocks(struct inode *inode, u64 from, bool lock);
 int f2fs_truncate(struct inode *inode);
 int f2fs_getattr(struct user_namespace *mnt_userns, const struct path *path,
          struct kstat *stat, u32 request_mask, unsigned int flags);
 int f2fs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
          struct iattr *attr);
 int f2fs_truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end);
 void f2fs_truncate_data_blocks_range(struct dnode_of_data *dn, int count);
 int f2fs_precache_extents(struct inode *inode);
 int f2fs_fileattr_get(struct dentry *dentry, struct fileattr *fa);
 int f2fs_fileattr_set(struct user_namespace *mnt_userns,
               struct dentry *dentry, struct fileattr *fa);
 long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
 long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 int f2fs_transfer_project_quota(struct inode *inode, kprojid_t kprojid);
 int f2fs_pin_file_control(struct inode *inode, bool inc);
 
 /*
  * inode.c
  */
 void f2fs_set_inode_flags(struct inode *inode);
 bool f2fs_inode_chksum_verify(struct f2fs_sb_info *sbi, struct page *page);
 void f2fs_inode_chksum_set(struct f2fs_sb_info *sbi, struct page *page);
 struct inode *f2fs_iget(struct super_block *sb, unsigned long ino);
 struct inode *f2fs_iget_retry(struct super_block *sb, unsigned long ino);
 int f2fs_try_to_free_nats(struct f2fs_sb_info *sbi, int nr_shrink);
 void f2fs_update_inode(struct inode *inode, struct page *node_page);
 void f2fs_update_inode_page(struct inode *inode);
 int f2fs_write_inode(struct inode *inode, struct writeback_control *wbc);
 void f2fs_evict_inode(struct inode *inode);
 void f2fs_handle_failed_inode(struct inode *inode);
 
 /*
  * namei.c
  */
 int f2fs_update_extension_list(struct f2fs_sb_info *sbi, const char *name,
                             bool hot, bool set);
 struct dentry *f2fs_get_parent(struct dentry *child);
 int f2fs_get_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,
              struct inode **new_inode);
 
 /*
  * dir.c
  */
 unsigned char f2fs_get_de_type(struct f2fs_dir_entry *de);
 int f2fs_init_casefolded_name(const struct inode *dir,
                   struct f2fs_filename *fname);
 int f2fs_setup_filename(struct inode *dir, const struct qstr *iname,
             int lookup, struct f2fs_filename *fname);
 int f2fs_prepare_lookup(struct inode *dir, struct dentry *dentry,
             struct f2fs_filename *fname);
 void f2fs_free_filename(struct f2fs_filename *fname);
 struct f2fs_dir_entry *f2fs_find_target_dentry(const struct f2fs_dentry_ptr *d,
             const struct f2fs_filename *fname, int *max_slots);
 int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
             unsigned int start_pos, struct fscrypt_str *fstr);
 void f2fs_do_make_empty_dir(struct inode *inode, struct inode *parent,
             struct f2fs_dentry_ptr *d);
 struct page *f2fs_init_inode_metadata(struct inode *inode, struct inode *dir,
             const struct f2fs_filename *fname, struct page *dpage);
 void f2fs_update_parent_metadata(struct inode *dir, struct inode *inode,
             unsigned int current_depth);
 int f2fs_room_for_filename(const void *bitmap, int slots, int max_slots);
 void f2fs_drop_nlink(struct inode *dir, struct inode *inode);
 struct f2fs_dir_entry *__f2fs_find_entry(struct inode *dir,
                      const struct f2fs_filename *fname,
                      struct page **res_page);
 struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir,
             const struct qstr *child, struct page **res_page);
 struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p);
 ino_t f2fs_inode_by_name(struct inode *dir, const struct qstr *qstr,
             struct page **page);
 void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de,
             struct page *page, struct inode *inode);
 bool f2fs_has_enough_room(struct inode *dir, struct page *ipage,
               const struct f2fs_filename *fname);
 void f2fs_update_dentry(nid_t ino, umode_t mode, struct f2fs_dentry_ptr *d,
             const struct fscrypt_str *name, f2fs_hash_t name_hash,
             unsigned int bit_pos);
 int f2fs_add_regular_entry(struct inode *dir, const struct f2fs_filename *fname,
             struct inode *inode, nid_t ino, umode_t mode);
 int f2fs_add_dentry(struct inode *dir, const struct f2fs_filename *fname,
             struct inode *inode, nid_t ino, umode_t mode);
 int f2fs_do_add_link(struct inode *dir, const struct qstr *name,
             struct inode *inode, nid_t ino, umode_t mode);
 void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
             struct inode *dir, struct inode *inode);
 int f2fs_do_tmpfile(struct inode *inode, struct inode *dir);
 bool f2fs_empty_dir(struct inode *dir);
 
 static inline int f2fs_add_link(struct dentry *dentry, struct inode *inode)
 {
     if (fscrypt_is_nokey_name(dentry))
         return -ENOKEY;
     return f2fs_do_add_link(d_inode(dentry->d_parent), &dentry->d_name,
                 inode, inode->i_ino, inode->i_mode);
 }
 
 /*
  * super.c
  */
 int f2fs_inode_dirtied(struct inode *inode, bool sync);
 void f2fs_inode_synced(struct inode *inode);
 int f2fs_dquot_initialize(struct inode *inode);
 int f2fs_enable_quota_files(struct f2fs_sb_info *sbi, bool rdonly);
 int f2fs_quota_sync(struct super_block *sb, int type);
 loff_t max_file_blocks(struct inode *inode);
 void f2fs_quota_off_umount(struct super_block *sb);
 int f2fs_commit_super(struct f2fs_sb_info *sbi, bool recover);
 int f2fs_sync_fs(struct super_block *sb, int sync);
 int f2fs_sanity_check_ckpt(struct f2fs_sb_info *sbi);
 
 /*
  * hash.c
  */
 void f2fs_hash_filename(const struct inode *dir, struct f2fs_filename *fname);
 
 /*
  * node.c
  */
 struct node_info;
 
 int f2fs_check_nid_range(struct f2fs_sb_info *sbi, nid_t nid);
 bool f2fs_available_free_memory(struct f2fs_sb_info *sbi, int type);
 bool f2fs_in_warm_node_list(struct f2fs_sb_info *sbi, struct page *page);
 void f2fs_init_fsync_node_info(struct f2fs_sb_info *sbi);
 void f2fs_del_fsync_node_entry(struct f2fs_sb_info *sbi, struct page *page);
 void f2fs_reset_fsync_node_info(struct f2fs_sb_info *sbi);
 int f2fs_need_dentry_mark(struct f2fs_sb_info *sbi, nid_t nid);
 bool f2fs_is_checkpointed_node(struct f2fs_sb_info *sbi, nid_t nid);
 bool f2fs_need_inode_block_update(struct f2fs_sb_info *sbi, nid_t ino);
 int f2fs_get_node_info(struct f2fs_sb_info *sbi, nid_t nid,
                 struct node_info *ni, bool checkpoint_context);
 pgoff_t f2fs_get_next_page_offset(struct dnode_of_data *dn, pgoff_t pgofs);
 int f2fs_get_dnode_of_data(struct dnode_of_data *dn, pgoff_t index, int mode);
 int f2fs_truncate_inode_blocks(struct inode *inode, pgoff_t from);
 int f2fs_truncate_xattr_node(struct inode *inode);
 int f2fs_wait_on_node_pages_writeback(struct f2fs_sb_info *sbi,
                     unsigned int seq_id);
 bool f2fs_nat_bitmap_enabled(struct f2fs_sb_info *sbi);
 int f2fs_remove_inode_page(struct inode *inode);
 struct page *f2fs_new_inode_page(struct inode *inode);
 struct page *f2fs_new_node_page(struct dnode_of_data *dn, unsigned int ofs);
 void f2fs_ra_node_page(struct f2fs_sb_info *sbi, nid_t nid);
 struct page *f2fs_get_node_page(struct f2fs_sb_info *sbi, pgoff_t nid);
 struct page *f2fs_get_node_page_ra(struct page *parent, int start);
 int f2fs_move_node_page(struct page *node_page, int gc_type);
 void f2fs_flush_inline_data(struct f2fs_sb_info *sbi);
 int f2fs_fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,
             struct writeback_control *wbc, bool atomic,
             unsigned int *seq_id);
 int f2fs_sync_node_pages(struct f2fs_sb_info *sbi,
             struct writeback_control *wbc,
             bool do_balance, enum iostat_type io_type);
 int f2fs_build_free_nids(struct f2fs_sb_info *sbi, bool sync, bool mount);
 bool f2fs_alloc_nid(struct f2fs_sb_info *sbi, nid_t *nid);
 void f2fs_alloc_nid_done(struct f2fs_sb_info *sbi, nid_t nid);
 void f2fs_alloc_nid_failed(struct f2fs_sb_info *sbi, nid_t nid);
 int f2fs_try_to_free_nids(struct f2fs_sb_info *sbi, int nr_shrink);
 int f2fs_recover_inline_xattr(struct inode *inode, struct page *page);
 int f2fs_recover_xattr_data(struct inode *inode, struct page *page);
 int f2fs_recover_inode_page(struct f2fs_sb_info *sbi, struct page *page);
 int f2fs_restore_node_summary(struct f2fs_sb_info *sbi,
             unsigned int segno, struct f2fs_summary_block *sum);
 void f2fs_enable_nat_bits(struct f2fs_sb_info *sbi);
 int f2fs_flush_nat_entries(struct f2fs_sb_info *sbi, struct cp_control *cpc);
 int f2fs_build_node_manager(struct f2fs_sb_info *sbi);
 void f2fs_destroy_node_manager(struct f2fs_sb_info *sbi);
 int __init f2fs_create_node_manager_caches(void);
 void f2fs_destroy_node_manager_caches(void);
 
 /*
  * segment.c
  */
 bool f2fs_need_SSR(struct f2fs_sb_info *sbi);
 int f2fs_commit_atomic_write(struct inode *inode);
 void f2fs_abort_atomic_write(struct inode *inode, bool clean);
 void f2fs_balance_fs(struct f2fs_sb_info *sbi, bool need);
 void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi, bool from_bg);
 int f2fs_issue_flush(struct f2fs_sb_info *sbi, nid_t ino);
 int f2fs_create_flush_cmd_control(struct f2fs_sb_info *sbi);
 int f2fs_flush_device_cache(struct f2fs_sb_info *sbi);
 void f2fs_destroy_flush_cmd_control(struct f2fs_sb_info *sbi, bool free);
 void f2fs_invalidate_blocks(struct f2fs_sb_info *sbi, block_t addr);
 bool f2fs_is_checkpointed_data(struct f2fs_sb_info *sbi, block_t blkaddr);
 int f2fs_start_discard_thread(struct f2fs_sb_info *sbi);
 void f2fs_drop_discard_cmd(struct f2fs_sb_info *sbi);
 void f2fs_stop_discard_thread(struct f2fs_sb_info *sbi);
 bool f2fs_issue_discard_timeout(struct f2fs_sb_info *sbi);
 void f2fs_clear_prefree_segments(struct f2fs_sb_info *sbi,
                     struct cp_control *cpc);
 void f2fs_dirty_to_prefree(struct f2fs_sb_info *sbi);
 block_t f2fs_get_unusable_blocks(struct f2fs_sb_info *sbi);
 int f2fs_disable_cp_again(struct f2fs_sb_info *sbi, block_t unusable);
 void f2fs_release_discard_addrs(struct f2fs_sb_info *sbi);
 int f2fs_npages_for_summary_flush(struct f2fs_sb_info *sbi, bool for_ra);
 bool f2fs_segment_has_free_slot(struct f2fs_sb_info *sbi, int segno);
 void f2fs_init_inmem_curseg(struct f2fs_sb_info *sbi);
 void f2fs_save_inmem_curseg(struct f2fs_sb_info *sbi);
 void f2fs_restore_inmem_curseg(struct f2fs_sb_info *sbi);
 void f2fs_get_new_segment(struct f2fs_sb_info *sbi,
             unsigned int *newseg, bool new_sec, int dir);
 void f2fs_allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type,
                     unsigned int start, unsigned int end);
 void f2fs_allocate_new_section(struct f2fs_sb_info *sbi, int type, bool force);
 void f2fs_allocate_new_segments(struct f2fs_sb_info *sbi);
 int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range);
 bool f2fs_exist_trim_candidates(struct f2fs_sb_info *sbi,
                     struct cp_control *cpc);
 struct page *f2fs_get_sum_page(struct f2fs_sb_info *sbi, unsigned int segno);
 void f2fs_update_meta_page(struct f2fs_sb_info *sbi, void *src,
                     block_t blk_addr);
 void f2fs_do_write_meta_page(struct f2fs_sb_info *sbi, struct page *page,
                         enum iostat_type io_type);
 void f2fs_do_write_node_page(unsigned int nid, struct f2fs_io_info *fio);
 void f2fs_outplace_write_data(struct dnode_of_data *dn,
             struct f2fs_io_info *fio);
 int f2fs_inplace_write_data(struct f2fs_io_info *fio);
 void f2fs_do_replace_block(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
             block_t old_blkaddr, block_t new_blkaddr,
             bool recover_curseg, bool recover_newaddr,
             bool from_gc);
 void f2fs_replace_block(struct f2fs_sb_info *sbi, struct dnode_of_data *dn,
             block_t old_addr, block_t new_addr,
             unsigned char version, bool recover_curseg,
             bool recover_newaddr);
 void f2fs_allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
             block_t old_blkaddr, block_t *new_blkaddr,
             struct f2fs_summary *sum, int type,
             struct f2fs_io_info *fio);
 void f2fs_update_device_state(struct f2fs_sb_info *sbi, nid_t ino,
                     block_t blkaddr, unsigned int blkcnt);
 void f2fs_wait_on_page_writeback(struct page *page,
             enum page_type type, bool ordered, bool locked);
 void f2fs_wait_on_block_writeback(struct inode *inode, block_t blkaddr);
 void f2fs_wait_on_block_writeback_range(struct inode *inode, block_t blkaddr,
                                 block_t len);
 void f2fs_write_data_summaries(struct f2fs_sb_info *sbi, block_t start_blk);
 void f2fs_write_node_summaries(struct f2fs_sb_info *sbi, block_t start_blk);
 int f2fs_lookup_journal_in_cursum(struct f2fs_journal *journal, int type,
             unsigned int val, int alloc);
 void f2fs_flush_sit_entries(struct f2fs_sb_info *sbi, struct cp_control *cpc);
 int f2fs_fix_curseg_write_pointer(struct f2fs_sb_info *sbi);
 int f2fs_check_write_pointer(struct f2fs_sb_info *sbi);
 int f2fs_build_segment_manager(struct f2fs_sb_info *sbi);
 void f2fs_destroy_segment_manager(struct f2fs_sb_info *sbi);
 int __init f2fs_create_segment_manager_caches(void);
 void f2fs_destroy_segment_manager_caches(void);
 int f2fs_rw_hint_to_seg_type(enum rw_hint hint);
 unsigned int f2fs_usable_segs_in_sec(struct f2fs_sb_info *sbi,
             unsigned int segno);
 unsigned int f2fs_usable_blks_in_seg(struct f2fs_sb_info *sbi,
             unsigned int segno);
 
 #define DEF_FRAGMENT_SIZE   4
 #define MIN_FRAGMENT_SIZE   1
 #define MAX_FRAGMENT_SIZE   512
 
 static inline bool f2fs_need_rand_seg(struct f2fs_sb_info *sbi)
 {
     return F2FS_OPTION(sbi).fs_mode == FS_MODE_FRAGMENT_SEG ||
         F2FS_OPTION(sbi).fs_mode == FS_MODE_FRAGMENT_BLK;
 }
 
 /*
  * checkpoint.c
  */
 void f2fs_stop_checkpoint(struct f2fs_sb_info *sbi, bool end_io);
 struct page *f2fs_grab_meta_page(struct f2fs_sb_info *sbi, pgoff_t index);
 struct page *f2fs_get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index);
 struct page *f2fs_get_meta_page_retry(struct f2fs_sb_info *sbi, pgoff_t index);
 struct page *f2fs_get_tmp_page(struct f2fs_sb_info *sbi, pgoff_t index);
 bool f2fs_is_valid_blkaddr(struct f2fs_sb_info *sbi,
                     block_t blkaddr, int type);
 int f2fs_ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages,
             int type, bool sync);
 void f2fs_ra_meta_pages_cond(struct f2fs_sb_info *sbi, pgoff_t index,
                             unsigned int ra_blocks);
 long f2fs_sync_meta_pages(struct f2fs_sb_info *sbi, enum page_type type,
             long nr_to_write, enum iostat_type io_type);
 void f2fs_add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type);
 void f2fs_remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type);
 void f2fs_release_ino_entry(struct f2fs_sb_info *sbi, bool all);
 bool f2fs_exist_written_data(struct f2fs_sb_info *sbi, nid_t ino, int mode);
 void f2fs_set_dirty_device(struct f2fs_sb_info *sbi, nid_t ino,
                     unsigned int devidx, int type);
 bool f2fs_is_dirty_device(struct f2fs_sb_info *sbi, nid_t ino,
                     unsigned int devidx, int type);
 int f2fs_sync_inode_meta(struct f2fs_sb_info *sbi);
 int f2fs_acquire_orphan_inode(struct f2fs_sb_info *sbi);
 void f2fs_release_orphan_inode(struct f2fs_sb_info *sbi);
 void f2fs_add_orphan_inode(struct inode *inode);
 void f2fs_remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino);
 int f2fs_recover_orphan_inodes(struct f2fs_sb_info *sbi);
 int f2fs_get_valid_checkpoint(struct f2fs_sb_info *sbi);
 void f2fs_update_dirty_folio(struct inode *inode, struct folio *folio);
 void f2fs_remove_dirty_inode(struct inode *inode);
 int f2fs_sync_dirty_inodes(struct f2fs_sb_info *sbi, enum inode_type type);
 void f2fs_wait_on_all_pages(struct f2fs_sb_info *sbi, int type);
 u64 f2fs_get_sectors_written(struct f2fs_sb_info *sbi);
 int f2fs_write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc);
 void f2fs_init_ino_entry_info(struct f2fs_sb_info *sbi);
 int __init f2fs_create_checkpoint_caches(void);
 void f2fs_destroy_checkpoint_caches(void);
 int f2fs_issue_checkpoint(struct f2fs_sb_info *sbi);
 int f2fs_start_ckpt_thread(struct f2fs_sb_info *sbi);
 void f2fs_stop_ckpt_thread(struct f2fs_sb_info *sbi);
 void f2fs_init_ckpt_req_control(struct f2fs_sb_info *sbi);
 
 /*
  * data.c
  */
 int __init f2fs_init_bioset(void);
 void f2fs_destroy_bioset(void);
 int f2fs_init_bio_entry_cache(void);
 void f2fs_destroy_bio_entry_cache(void);
 void f2fs_submit_bio(struct f2fs_sb_info *sbi,
                 struct bio *bio, enum page_type type);
 int f2fs_init_write_merge_io(struct f2fs_sb_info *sbi);
 void f2fs_submit_merged_write(struct f2fs_sb_info *sbi, enum page_type type);
 void f2fs_submit_merged_write_cond(struct f2fs_sb_info *sbi,
                 struct inode *inode, struct page *page,
                 nid_t ino, enum page_type type);
 void f2fs_submit_merged_ipu_write(struct f2fs_sb_info *sbi,
                     struct bio **bio, struct page *page);
 void f2fs_flush_merged_writes(struct f2fs_sb_info *sbi);
 int f2fs_submit_page_bio(struct f2fs_io_info *fio);
 int f2fs_merge_page_bio(struct f2fs_io_info *fio);
 void f2fs_submit_page_write(struct f2fs_io_info *fio);
 struct block_device *f2fs_target_device(struct f2fs_sb_info *sbi,
         block_t blk_addr, sector_t *sector);
 int f2fs_target_device_index(struct f2fs_sb_info *sbi, block_t blkaddr);
 void f2fs_set_data_blkaddr(struct dnode_of_data *dn);
 void f2fs_update_data_blkaddr(struct dnode_of_data *dn, block_t blkaddr);
 int f2fs_reserve_new_blocks(struct dnode_of_data *dn, blkcnt_t count);
 int f2fs_reserve_new_block(struct dnode_of_data *dn);
 int f2fs_get_block(struct dnode_of_data *dn, pgoff_t index);
 int f2fs_reserve_block(struct dnode_of_data *dn, pgoff_t index);
 struct page *f2fs_get_read_data_page(struct inode *inode, pgoff_t index,
             blk_opf_t op_flags, bool for_write);
 struct page *f2fs_find_data_page(struct inode *inode, pgoff_t index);
 struct page *f2fs_get_lock_data_page(struct inode *inode, pgoff_t index,
             bool for_write);
 struct page *f2fs_get_new_data_page(struct inode *inode,
             struct page *ipage, pgoff_t index, bool new_i_size);
 int f2fs_do_write_data_page(struct f2fs_io_info *fio);
 void f2fs_do_map_lock(struct f2fs_sb_info *sbi, int flag, bool lock);
 int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
             int create, int flag);
 int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
             u64 start, u64 len);
 int f2fs_encrypt_one_page(struct f2fs_io_info *fio);
 bool f2fs_should_update_inplace(struct inode *inode, struct f2fs_io_info *fio);
 bool f2fs_should_update_outplace(struct inode *inode, struct f2fs_io_info *fio);
 int f2fs_write_single_data_page(struct page *page, int *submitted,
                 struct bio **bio, sector_t *last_block,
                 struct writeback_control *wbc,
                 enum iostat_type io_type,
                 int compr_blocks, bool allow_balance);
 void f2fs_write_failed(struct inode *inode, loff_t to);
 void f2fs_invalidate_folio(struct folio *folio, size_t offset, size_t length);
 bool f2fs_release_folio(struct folio *folio, gfp_t wait);
 bool f2fs_overwrite_io(struct inode *inode, loff_t pos, size_t len);
 void f2fs_clear_page_cache_dirty_tag(struct page *page);
 int f2fs_init_post_read_processing(void);
 void f2fs_destroy_post_read_processing(void);
 int f2fs_init_post_read_wq(struct f2fs_sb_info *sbi);
 void f2fs_destroy_post_read_wq(struct f2fs_sb_info *sbi);
 extern const struct iomap_ops f2fs_iomap_ops;
 
 /*
  * gc.c
  */
 int f2fs_start_gc_thread(struct f2fs_sb_info *sbi);
 void f2fs_stop_gc_thread(struct f2fs_sb_info *sbi);
 block_t f2fs_start_bidx_of_node(unsigned int node_ofs, struct inode *inode);
 int f2fs_gc(struct f2fs_sb_info *sbi, struct f2fs_gc_control *gc_control);
 void f2fs_build_gc_manager(struct f2fs_sb_info *sbi);
 int f2fs_resize_fs(struct f2fs_sb_info *sbi, __u64 block_count);
 int __init f2fs_create_garbage_collection_cache(void);
 void f2fs_destroy_garbage_collection_cache(void);
 
 /*
  * recovery.c
  */
 int f2fs_recover_fsync_data(struct f2fs_sb_info *sbi, bool check_only);
 bool f2fs_space_for_roll_forward(struct f2fs_sb_info *sbi);
 int __init f2fs_create_recovery_cache(void);
 void f2fs_destroy_recovery_cache(void);
 
 /*
  * 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;
     unsigned long long hit_largest, hit_cached, hit_rbtree;
     unsigned long long hit_total, total_ext;
     int ext_tree, zombie_tree, ext_node;
     int ndirty_node, ndirty_dent, ndirty_meta, ndirty_imeta;
     int ndirty_data, ndirty_qdata;
     unsigned int ndirty_dirs, ndirty_files, nquota_files, ndirty_all;
     int nats, dirty_nats, sits, dirty_sits;
     int free_nids, avail_nids, alloc_nids;
     int total_count, utilization;
     int bg_gc, nr_wb_cp_data, nr_wb_data;
     int nr_rd_data, nr_rd_node, nr_rd_meta;
     int nr_dio_read, nr_dio_write;
     unsigned int io_skip_bggc, other_skip_bggc;
     int nr_flushing, nr_flushed, flush_list_empty;
     int nr_discarding, nr_discarded;
     int nr_discard_cmd;
     unsigned int undiscard_blks;
     int nr_issued_ckpt, nr_total_ckpt, nr_queued_ckpt;
     unsigned int cur_ckpt_time, peak_ckpt_time;
     int inline_xattr, inline_inode, inline_dir, append, update, orphans;
     int compr_inode;
     unsigned long long compr_blocks;
     int aw_cnt, max_aw_cnt;
     unsigned int valid_count, valid_node_count, valid_inode_count, discard_blks;
     unsigned int bimodal, avg_vblocks;
     int util_free, util_valid, util_invalid;
     int rsvd_segs, overp_segs;
     int dirty_count, node_pages, meta_pages, compress_pages;
     int compress_page_hit;
     int prefree_count, call_count, cp_count, bg_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 dirty_seg[NR_CURSEG_TYPE];
     unsigned int full_seg[NR_CURSEG_TYPE];
     unsigned int valid_blks[NR_CURSEG_TYPE];
 
     unsigned int meta_count[META_MAX];
     unsigned int segment_count[2];
     unsigned int block_count[2];
     unsigned int inplace_count;
     unsigned long long 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_bg_cp_count(si)    ((si)->bg_cp_count++)
 #define stat_inc_call_count(si)     ((si)->call_count++)
 #define stat_inc_bggc_count(si)     ((si)->bg_gc++)
 #define stat_io_skip_bggc_count(sbi)    ((sbi)->io_skip_bggc++)
 #define stat_other_skip_bggc_count(sbi) ((sbi)->other_skip_bggc++)
 #define stat_inc_dirty_inode(sbi, type) ((sbi)->ndirty_inode[type]++)
 #define stat_dec_dirty_inode(sbi, type) ((sbi)->ndirty_inode[type]--)
 #define stat_inc_total_hit(sbi)     (atomic64_inc(&(sbi)->total_hit_ext))
 #define stat_inc_rbtree_node_hit(sbi)   (atomic64_inc(&(sbi)->read_hit_rbtree))
 #define stat_inc_largest_node_hit(sbi)  (atomic64_inc(&(sbi)->read_hit_largest))
 #define stat_inc_cached_node_hit(sbi)   (atomic64_inc(&(sbi)->read_hit_cached))
 #define stat_inc_inline_xattr(inode)                    \
     do {                                \
         if (f2fs_has_inline_xattr(inode))           \
             (atomic_inc(&F2FS_I_SB(inode)->inline_xattr));  \
     } while (0)
 #define stat_dec_inline_xattr(inode)                    \
     do {                                \
         if (f2fs_has_inline_xattr(inode))           \
             (atomic_dec(&F2FS_I_SB(inode)->inline_xattr));  \
     } while (0)
 #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_compr_inode(inode)                 \
     do {                                \
         if (f2fs_compressed_file(inode))            \
             (atomic_inc(&F2FS_I_SB(inode)->compr_inode));   \
     } while (0)
 #define stat_dec_compr_inode(inode)                 \
     do {                                \
         if (f2fs_compressed_file(inode))            \
             (atomic_dec(&F2FS_I_SB(inode)->compr_inode));   \
     } while (0)
 #define stat_add_compr_blocks(inode, blocks)                \
         (atomic64_add(blocks, &F2FS_I_SB(inode)->compr_blocks))
 #define stat_sub_compr_blocks(inode, blocks)                \
         (atomic64_sub(blocks, &F2FS_I_SB(inode)->compr_blocks))
 #define stat_inc_meta_count(sbi, blkaddr)               \
     do {                                \
         if (blkaddr < SIT_I(sbi)->sit_base_addr)        \
             atomic_inc(&(sbi)->meta_count[META_CP]);    \
         else if (blkaddr < NM_I(sbi)->nat_blkaddr)      \
             atomic_inc(&(sbi)->meta_count[META_SIT]);   \
         else if (blkaddr < SM_I(sbi)->ssa_blkaddr)      \
             atomic_inc(&(sbi)->meta_count[META_NAT]);   \
         else if (blkaddr < SM_I(sbi)->main_blkaddr)     \
             atomic_inc(&(sbi)->meta_count[META_SSA]);   \
     } 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_update_max_atomic_write(inode)             \
     do {                                \
         int cur = F2FS_I_SB(inode)->atomic_files;   \
         int max = atomic_read(&F2FS_I_SB(inode)->max_aw_cnt);   \
         if (cur > max)                      \
             atomic_set(&F2FS_I_SB(inode)->max_aw_cnt, cur); \
     } while (0)
 #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 *sbi);
 void f2fs_destroy_stats(struct f2fs_sb_info *sbi);
 void __init f2fs_create_root_stats(void);
 void f2fs_destroy_root_stats(void);
 void f2fs_update_sit_info(struct f2fs_sb_info *sbi);
 #else
 #define stat_inc_cp_count(si)               do { } while (0)
 #define stat_inc_bg_cp_count(si)            do { } while (0)
 #define stat_inc_call_count(si)             do { } while (0)
 #define stat_inc_bggc_count(si)             do { } while (0)
 #define stat_io_skip_bggc_count(sbi)            do { } while (0)
 #define stat_other_skip_bggc_count(sbi)         do { } while (0)
 #define stat_inc_dirty_inode(sbi, type)         do { } while (0)
 #define stat_dec_dirty_inode(sbi, type)         do { } while (0)
 #define stat_inc_total_hit(sbi)             do { } while (0)
 #define stat_inc_rbtree_node_hit(sbi)           do { } while (0)
 #define stat_inc_largest_node_hit(sbi)          do { } while (0)
 #define stat_inc_cached_node_hit(sbi)           do { } while (0)
 #define stat_inc_inline_xattr(inode)            do { } while (0)
 #define stat_dec_inline_xattr(inode)            do { } while (0)
 #define stat_inc_inline_inode(inode)            do { } while (0)
 #define stat_dec_inline_inode(inode)            do { } while (0)
 #define stat_inc_inline_dir(inode)          do { } while (0)
 #define stat_dec_inline_dir(inode)          do { } while (0)
 #define stat_inc_compr_inode(inode)         do { } while (0)
 #define stat_dec_compr_inode(inode)         do { } while (0)
 #define stat_add_compr_blocks(inode, blocks)        do { } while (0)
 #define stat_sub_compr_blocks(inode, blocks)        do { } while (0)
 #define stat_update_max_atomic_write(inode)     do { } while (0)
 #define stat_inc_meta_count(sbi, blkaddr)       do { } while (0)
 #define stat_inc_seg_type(sbi, curseg)          do { } while (0)
 #define stat_inc_block_count(sbi, curseg)       do { } while (0)
 #define stat_inc_inplace_blocks(sbi)            do { } while (0)
 #define stat_inc_seg_count(sbi, type, gc_type)      do { } while (0)
 #define stat_inc_tot_blk_count(si, blks)        do { } while (0)
 #define stat_inc_data_blk_count(sbi, blks, gc_type) do { } while (0)
 #define stat_inc_node_blk_count(sbi, blks, gc_type) do { } while (0)
 
 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) { }
 static inline void f2fs_update_sit_info(struct f2fs_sb_info *sbi) {}
 #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 *f2fs_inode_entry_slab;
 
 /*
  * inline.c
  */
 bool f2fs_may_inline_data(struct inode *inode);
 bool f2fs_sanity_check_inline_data(struct inode *inode);
 bool f2fs_may_inline_dentry(struct inode *inode);
 void f2fs_do_read_inline_data(struct page *page, struct page *ipage);
 void f2fs_truncate_inline_inode(struct inode *inode,
                         struct page *ipage, u64 from);
 int f2fs_read_inline_data(struct inode *inode, struct page *page);
 int f2fs_convert_inline_page(struct dnode_of_data *dn, struct page *page);
 int f2fs_convert_inline_inode(struct inode *inode);
 int f2fs_try_convert_inline_dir(struct inode *dir, struct dentry *dentry);
 int f2fs_write_inline_data(struct inode *inode, struct page *page);
 int f2fs_recover_inline_data(struct inode *inode, struct page *npage);
 struct f2fs_dir_entry *f2fs_find_in_inline_dir(struct inode *dir,
                     const struct f2fs_filename *fname,
                     struct page **res_page);
 int f2fs_make_empty_inline_dir(struct inode *inode, struct inode *parent,
             struct page *ipage);
 int f2fs_add_inline_entry(struct inode *dir, const struct f2fs_filename *fname,
             struct inode *inode, nid_t ino, umode_t mode);
 void f2fs_delete_inline_entry(struct f2fs_dir_entry *dentry,
                 struct page *page, struct inode *dir,
                 struct inode *inode);
 bool f2fs_empty_inline_dir(struct inode *dir);
 int f2fs_read_inline_dir(struct file *file, struct dir_context *ctx,
             struct fscrypt_str *fstr);
 int f2fs_inline_data_fiemap(struct inode *inode,
             struct fiemap_extent_info *fieinfo,
             __u64 start, __u64 len);
 
 /*
  * shrinker.c
  */
 unsigned long f2fs_shrink_count(struct shrinker *shrink,
             struct shrink_control *sc);
 unsigned long f2fs_shrink_scan(struct shrinker *shrink,
             struct shrink_control *sc);
 void f2fs_join_shrinker(struct f2fs_sb_info *sbi);
 void f2fs_leave_shrinker(struct f2fs_sb_info *sbi);
 
 /*
  * extent_cache.c
  */
 struct rb_entry *f2fs_lookup_rb_tree(struct rb_root_cached *root,
                 struct rb_entry *cached_re, unsigned int ofs);
 struct rb_node **f2fs_lookup_rb_tree_ext(struct f2fs_sb_info *sbi,
                 struct rb_root_cached *root,
                 struct rb_node **parent,
                 unsigned long long key, bool *left_most);
 struct rb_node **f2fs_lookup_rb_tree_for_insert(struct f2fs_sb_info *sbi,
                 struct rb_root_cached *root,
                 struct rb_node **parent,
                 unsigned int ofs, bool *leftmost);
 struct rb_entry *f2fs_lookup_rb_tree_ret(struct rb_root_cached *root,
         struct rb_entry *cached_re, unsigned int ofs,
         struct rb_entry **prev_entry, struct rb_entry **next_entry,
         struct rb_node ***insert_p, struct rb_node **insert_parent,
         bool force, bool *leftmost);
 bool f2fs_check_rb_tree_consistence(struct f2fs_sb_info *sbi,
                 struct rb_root_cached *root, bool check_key);
 unsigned int f2fs_shrink_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink);
 void f2fs_init_extent_tree(struct inode *inode, struct page *ipage);
 void f2fs_drop_extent_tree(struct inode *inode);
 unsigned int f2fs_destroy_extent_node(struct inode *inode);
 void f2fs_destroy_extent_tree(struct inode *inode);
 bool f2fs_lookup_extent_cache(struct inode *inode, pgoff_t pgofs,
             struct extent_info *ei);
 void f2fs_update_extent_cache(struct dnode_of_data *dn);
 void f2fs_update_extent_cache_range(struct dnode_of_data *dn,
             pgoff_t fofs, block_t blkaddr, unsigned int len);
 void f2fs_init_extent_cache_info(struct f2fs_sb_info *sbi);
 int __init f2fs_create_extent_cache(void);
 void f2fs_destroy_extent_cache(void);
 
 /*
  * sysfs.c
  */
 #define MIN_RA_MUL  2
 #define MAX_RA_MUL  256
 
 int __init f2fs_init_sysfs(void);
 void f2fs_exit_sysfs(void);
 int f2fs_register_sysfs(struct f2fs_sb_info *sbi);
 void f2fs_unregister_sysfs(struct f2fs_sb_info *sbi);
 
 /* verity.c */
 extern const struct fsverity_operations f2fs_verityops;
 
 /*
  * crypto support
  */
 static inline bool f2fs_encrypted_file(struct inode *inode)
 {
     return IS_ENCRYPTED(inode) && S_ISREG(inode->i_mode);
 }
 
 static inline void f2fs_set_encrypted_inode(struct inode *inode)
 {
 #ifdef CONFIG_FS_ENCRYPTION
     file_set_encrypt(inode);
     f2fs_set_inode_flags(inode);
 #endif
 }
 
 /*
  * Returns true if the reads of the inode's data need to undergo some
  * postprocessing step, like decryption or authenticity verification.
  */
 static inline bool f2fs_post_read_required(struct inode *inode)
 {
     return f2fs_encrypted_file(inode) || fsverity_active(inode) ||
         f2fs_compressed_file(inode);
 }
 
 /*
  * compress.c
  */
 #ifdef CONFIG_F2FS_FS_COMPRESSION
 bool f2fs_is_compressed_page(struct page *page);
 struct page *f2fs_compress_control_page(struct page *page);
 int f2fs_prepare_compress_overwrite(struct inode *inode,
             struct page **pagep, pgoff_t index, void **fsdata);
 bool f2fs_compress_write_end(struct inode *inode, void *fsdata,
                     pgoff_t index, unsigned copied);
 int f2fs_truncate_partial_cluster(struct inode *inode, u64 from, bool lock);
 void f2fs_compress_write_end_io(struct bio *bio, struct page *page);
 bool f2fs_is_compress_backend_ready(struct inode *inode);
 int f2fs_init_compress_mempool(void);
 void f2fs_destroy_compress_mempool(void);
 void f2fs_decompress_cluster(struct decompress_io_ctx *dic, bool in_task);
 void f2fs_end_read_compressed_page(struct page *page, bool failed,
                 block_t blkaddr, bool in_task);
 bool f2fs_cluster_is_empty(struct compress_ctx *cc);
 bool f2fs_cluster_can_merge_page(struct compress_ctx *cc, pgoff_t index);
 bool f2fs_all_cluster_page_ready(struct compress_ctx *cc, struct page **pages,
                 int index, int nr_pages, bool uptodate);
 bool f2fs_sanity_check_cluster(struct dnode_of_data *dn);
 void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct page *page);
 int f2fs_write_multi_pages(struct compress_ctx *cc,
                         int *submitted,
                         struct writeback_control *wbc,
                         enum iostat_type io_type);
 int f2fs_is_compressed_cluster(struct inode *inode, pgoff_t index);
 void f2fs_update_extent_tree_range_compressed(struct inode *inode,
                 pgoff_t fofs, block_t blkaddr, unsigned int llen,
                 unsigned int c_len);
 int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
                 unsigned nr_pages, sector_t *last_block_in_bio,
                 bool is_readahead, bool for_write);
 struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc);
 void f2fs_decompress_end_io(struct decompress_io_ctx *dic, bool failed,
                 bool in_task);
 void f2fs_put_page_dic(struct page *page, bool in_task);
 unsigned int f2fs_cluster_blocks_are_contiguous(struct dnode_of_data *dn);
 int f2fs_init_compress_ctx(struct compress_ctx *cc);
 void f2fs_destroy_compress_ctx(struct compress_ctx *cc, bool reuse);
 void f2fs_init_compress_info(struct f2fs_sb_info *sbi);
 int f2fs_init_compress_inode(struct f2fs_sb_info *sbi);
 void f2fs_destroy_compress_inode(struct f2fs_sb_info *sbi);
 int f2fs_init_page_array_cache(struct f2fs_sb_info *sbi);
 void f2fs_destroy_page_array_cache(struct f2fs_sb_info *sbi);
 int __init f2fs_init_compress_cache(void);
 void f2fs_destroy_compress_cache(void);
 struct address_space *COMPRESS_MAPPING(struct f2fs_sb_info *sbi);
 void f2fs_invalidate_compress_page(struct f2fs_sb_info *sbi, block_t blkaddr);
 void f2fs_cache_compressed_page(struct f2fs_sb_info *sbi, struct page *page,
                         nid_t ino, block_t blkaddr);
 bool f2fs_load_compressed_page(struct f2fs_sb_info *sbi, struct page *page,
                                 block_t blkaddr);
 void f2fs_invalidate_compress_pages(struct f2fs_sb_info *sbi, nid_t ino);
 #define inc_compr_inode_stat(inode)                 \
     do {                                \
         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);        \
         sbi->compr_new_inode++;                 \
     } while (0)
 #define add_compr_block_stat(inode, blocks)             \
     do {                                \
         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);        \
         int diff = F2FS_I(inode)->i_cluster_size - blocks;  \
         sbi->compr_written_block += blocks;         \
         sbi->compr_saved_block += diff;             \
     } while (0)
 #else
 static inline bool f2fs_is_compressed_page(struct page *page) { return false; }
 static inline bool f2fs_is_compress_backend_ready(struct inode *inode)
 {
     if (!f2fs_compressed_file(inode))
         return true;
     /* not support compression */
     return false;
 }
 static inline struct page *f2fs_compress_control_page(struct page *page)
 {
     WARN_ON_ONCE(1);
     return ERR_PTR(-EINVAL);
 }
 static inline int f2fs_init_compress_mempool(void) { return 0; }
 static inline void f2fs_destroy_compress_mempool(void) { }
 static inline void f2fs_decompress_cluster(struct decompress_io_ctx *dic,
                 bool in_task) { }
 static inline void f2fs_end_read_compressed_page(struct page *page,
                 bool failed, block_t blkaddr, bool in_task)
 {
     WARN_ON_ONCE(1);
 }
 static inline void f2fs_put_page_dic(struct page *page, bool in_task)
 {
     WARN_ON_ONCE(1);
 }
 static inline unsigned int f2fs_cluster_blocks_are_contiguous(struct dnode_of_data *dn) { return 0; }
 static inline bool f2fs_sanity_check_cluster(struct dnode_of_data *dn) { return false; }
 static inline int f2fs_init_compress_inode(struct f2fs_sb_info *sbi) { return 0; }
 static inline void f2fs_destroy_compress_inode(struct f2fs_sb_info *sbi) { }
 static inline int f2fs_init_page_array_cache(struct f2fs_sb_info *sbi) { return 0; }
 static inline void f2fs_destroy_page_array_cache(struct f2fs_sb_info *sbi) { }
 static inline int __init f2fs_init_compress_cache(void) { return 0; }
 static inline void f2fs_destroy_compress_cache(void) { }
 static inline void f2fs_invalidate_compress_page(struct f2fs_sb_info *sbi,
                 block_t blkaddr) { }
 static inline void f2fs_cache_compressed_page(struct f2fs_sb_info *sbi,
                 struct page *page, nid_t ino, block_t blkaddr) { }
 static inline bool f2fs_load_compressed_page(struct f2fs_sb_info *sbi,
                 struct page *page, block_t blkaddr) { return false; }
 static inline void f2fs_invalidate_compress_pages(struct f2fs_sb_info *sbi,
                             nid_t ino) { }
 #define inc_compr_inode_stat(inode)     do { } while (0)
 static inline void f2fs_update_extent_tree_range_compressed(struct inode *inode,
                 pgoff_t fofs, block_t blkaddr, unsigned int llen,
                 unsigned int c_len) { }
 #endif
 
 static inline int set_compress_context(struct inode *inode)
 {
 #ifdef CONFIG_F2FS_FS_COMPRESSION
     struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 
     F2FS_I(inode)->i_compress_algorithm =
             F2FS_OPTION(sbi).compress_algorithm;
     F2FS_I(inode)->i_log_cluster_size =
             F2FS_OPTION(sbi).compress_log_size;
     F2FS_I(inode)->i_compress_flag =
             F2FS_OPTION(sbi).compress_chksum ?
                 1 << COMPRESS_CHKSUM : 0;
     F2FS_I(inode)->i_cluster_size =
             1 << F2FS_I(inode)->i_log_cluster_size;
     if ((F2FS_I(inode)->i_compress_algorithm == COMPRESS_LZ4 ||
         F2FS_I(inode)->i_compress_algorithm == COMPRESS_ZSTD) &&
             F2FS_OPTION(sbi).compress_level)
         F2FS_I(inode)->i_compress_flag |=
                 F2FS_OPTION(sbi).compress_level <<
                 COMPRESS_LEVEL_OFFSET;
     F2FS_I(inode)->i_flags |= F2FS_COMPR_FL;
     set_inode_flag(inode, FI_COMPRESSED_FILE);
     stat_inc_compr_inode(inode);
     inc_compr_inode_stat(inode);
     f2fs_mark_inode_dirty_sync(inode, true);
     return 0;
 #else
     return -EOPNOTSUPP;
 #endif
 }
 
 static inline bool f2fs_disable_compressed_file(struct inode *inode)
 {
     struct f2fs_inode_info *fi = F2FS_I(inode);
 
     if (!f2fs_compressed_file(inode))
         return true;
     if (S_ISREG(inode->i_mode) && F2FS_HAS_BLOCKS(inode))
         return false;
 
     fi->i_flags &= ~F2FS_COMPR_FL;
     stat_dec_compr_inode(inode);
     clear_inode_flag(inode, FI_COMPRESSED_FILE);
     f2fs_mark_inode_dirty_sync(inode, true);
     return true;
 }
 
 #define F2FS_FEATURE_FUNCS(name, flagname) \
 static inline int f2fs_sb_has_##name(struct f2fs_sb_info *sbi) \
 { \
     return F2FS_HAS_FEATURE(sbi, F2FS_FEATURE_##flagname); \
 }
 
 F2FS_FEATURE_FUNCS(encrypt, ENCRYPT);
 F2FS_FEATURE_FUNCS(blkzoned, BLKZONED);
 F2FS_FEATURE_FUNCS(extra_attr, EXTRA_ATTR);
 F2FS_FEATURE_FUNCS(project_quota, PRJQUOTA);
 F2FS_FEATURE_FUNCS(inode_chksum, INODE_CHKSUM);
 F2FS_FEATURE_FUNCS(flexible_inline_xattr, FLEXIBLE_INLINE_XATTR);
 F2FS_FEATURE_FUNCS(quota_ino, QUOTA_INO);
 F2FS_FEATURE_FUNCS(inode_crtime, INODE_CRTIME);
 F2FS_FEATURE_FUNCS(lost_found, LOST_FOUND);
 F2FS_FEATURE_FUNCS(verity, VERITY);
 F2FS_FEATURE_FUNCS(sb_chksum, SB_CHKSUM);
 F2FS_FEATURE_FUNCS(casefold, CASEFOLD);
 F2FS_FEATURE_FUNCS(compression, COMPRESSION);
 F2FS_FEATURE_FUNCS(readonly, RO);
 
 static inline bool f2fs_may_extent_tree(struct inode *inode)
 {
     struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 
     if (!test_opt(sbi, EXTENT_CACHE) ||
             is_inode_flag_set(inode, FI_NO_EXTENT) ||
             (is_inode_flag_set(inode, FI_COMPRESSED_FILE) &&
              !f2fs_sb_has_readonly(sbi)))
         return false;
 
     /*
      * for recovered files during mount do not create extents
      * if shrinker is not registered.
      */
     if (list_empty(&sbi->s_list))
         return false;
 
     return S_ISREG(inode->i_mode);
 }
 
 #ifdef CONFIG_BLK_DEV_ZONED
 static inline bool f2fs_blkz_is_seq(struct f2fs_sb_info *sbi, int devi,
                     block_t blkaddr)
 {
     unsigned int zno = blkaddr >> sbi->log_blocks_per_blkz;
 
     return test_bit(zno, FDEV(devi).blkz_seq);
 }
 #endif
 
 static inline bool f2fs_hw_should_discard(struct f2fs_sb_info *sbi)
 {
     return f2fs_sb_has_blkzoned(sbi);
 }
 
 static inline bool f2fs_bdev_support_discard(struct block_device *bdev)
 {
     return bdev_max_discard_sectors(bdev) || bdev_is_zoned(bdev);
 }
 
 static inline bool f2fs_hw_support_discard(struct f2fs_sb_info *sbi)
 {
     int i;
 
     if (!f2fs_is_multi_device(sbi))
         return f2fs_bdev_support_discard(sbi->sb->s_bdev);
 
     for (i = 0; i < sbi->s_ndevs; i++)
         if (f2fs_bdev_support_discard(FDEV(i).bdev))
             return true;
     return false;
 }
 
 static inline bool f2fs_realtime_discard_enable(struct f2fs_sb_info *sbi)
 {
     return (test_opt(sbi, DISCARD) && f2fs_hw_support_discard(sbi)) ||
                     f2fs_hw_should_discard(sbi);
 }
 
 static inline bool f2fs_hw_is_readonly(struct f2fs_sb_info *sbi)
 {
     int i;
 
     if (!f2fs_is_multi_device(sbi))
         return bdev_read_only(sbi->sb->s_bdev);
 
     for (i = 0; i < sbi->s_ndevs; i++)
         if (bdev_read_only(FDEV(i).bdev))
             return true;
     return false;
 }
 
 static inline bool f2fs_lfs_mode(struct f2fs_sb_info *sbi)
 {
     return F2FS_OPTION(sbi).fs_mode == FS_MODE_LFS;
 }
 
 static inline bool f2fs_low_mem_mode(struct f2fs_sb_info *sbi)
 {
     return F2FS_OPTION(sbi).memory_mode == MEMORY_MODE_LOW;
 }
 
 static inline bool f2fs_may_compress(struct inode *inode)
 {
     if (IS_SWAPFILE(inode) || f2fs_is_pinned_file(inode) ||
         f2fs_is_atomic_file(inode) || f2fs_has_inline_data(inode))
         return false;
     return S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode);
 }
 
 static inline void f2fs_i_compr_blocks_update(struct inode *inode,
                         u64 blocks, bool add)
 {
     struct f2fs_inode_info *fi = F2FS_I(inode);
     int diff = fi->i_cluster_size - blocks;
 
     /* don't update i_compr_blocks if saved blocks were released */
     if (!add && !atomic_read(&fi->i_compr_blocks))
         return;
 
     if (add) {
         atomic_add(diff, &fi->i_compr_blocks);
         stat_add_compr_blocks(inode, diff);
     } else {
         atomic_sub(diff, &fi->i_compr_blocks);
         stat_sub_compr_blocks(inode, diff);
     }
     f2fs_mark_inode_dirty_sync(inode, true);
 }
 
 static inline int block_unaligned_IO(struct inode *inode,
                 struct kiocb *iocb, struct iov_iter *iter)
 {
     unsigned int i_blkbits = READ_ONCE(inode->i_blkbits);
     unsigned int blocksize_mask = (1 << i_blkbits) - 1;
     loff_t offset = iocb->ki_pos;
     unsigned long align = offset | iov_iter_alignment(iter);
 
     return align & blocksize_mask;
 }
 
 static inline bool f2fs_allow_multi_device_dio(struct f2fs_sb_info *sbi,
                                 int flag)
 {
     if (!f2fs_is_multi_device(sbi))
         return false;
     if (flag != F2FS_GET_BLOCK_DIO)
         return false;
     return sbi->aligned_blksize;
 }
 
 static inline bool f2fs_force_buffered_io(struct inode *inode,
                 struct kiocb *iocb, struct iov_iter *iter)
 {
     struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
     int rw = iov_iter_rw(iter);
 
     if (!fscrypt_dio_supported(iocb, iter))
         return true;
     if (fsverity_active(inode))
         return true;
     if (f2fs_compressed_file(inode))
         return true;
 
     /* disallow direct IO if any of devices has unaligned blksize */
     if (f2fs_is_multi_device(sbi) && !sbi->aligned_blksize)
         return true;
 
     if (f2fs_lfs_mode(sbi) && (rw == WRITE)) {
         if (block_unaligned_IO(inode, iocb, iter))
             return true;
         if (F2FS_IO_ALIGNED(sbi))
             return true;
     }
     if (is_sbi_flag_set(F2FS_I_SB(inode), SBI_CP_DISABLED))
         return true;
 
     return false;
 }
 
 static inline bool f2fs_need_verity(const struct inode *inode, pgoff_t idx)
 {
     return fsverity_active(inode) &&
            idx < DIV_ROUND_UP(inode->i_size, PAGE_SIZE);
 }
 
 #ifdef CONFIG_F2FS_FAULT_INJECTION
 extern void f2fs_build_fault_attr(struct f2fs_sb_info *sbi, unsigned int rate,
                             unsigned int type);
 #else
 #define f2fs_build_fault_attr(sbi, rate, type)      do { } while (0)
 #endif
 
 static inline bool is_journalled_quota(struct f2fs_sb_info *sbi)
 {
 #ifdef CONFIG_QUOTA
     if (f2fs_sb_has_quota_ino(sbi))
         return true;
     if (F2FS_OPTION(sbi).s_qf_names[USRQUOTA] ||
         F2FS_OPTION(sbi).s_qf_names[GRPQUOTA] ||
         F2FS_OPTION(sbi).s_qf_names[PRJQUOTA])
         return true;
 #endif
     return false;
 }
 
 static inline bool f2fs_block_unit_discard(struct f2fs_sb_info *sbi)
 {
     return F2FS_OPTION(sbi).discard_unit == DISCARD_UNIT_BLOCK;
 }
 
 static inline void f2fs_io_schedule_timeout(long timeout)
 {
     set_current_state(TASK_UNINTERRUPTIBLE);
     io_schedule_timeout(timeout);
 }
 
 static inline void f2fs_handle_page_eio(struct f2fs_sb_info *sbi, pgoff_t ofs,
                     enum page_type type)
 {
     if (unlikely(f2fs_cp_error(sbi)))
         return;
 
     if (ofs == sbi->page_eio_ofs[type]) {
         if (sbi->page_eio_cnt[type]++ == MAX_RETRY_PAGE_EIO)
             set_ckpt_flags(sbi, CP_ERROR_FLAG);
     } else {
         sbi->page_eio_ofs[type] = ofs;
         sbi->page_eio_cnt[type] = 0;
     }
 }
 
 #define EFSBADCRC   EBADMSG     /* Bad CRC detected */
 #define EFSCORRUPTED    EUCLEAN     /* Filesystem is corrupted */
 
 #endif /* _LINUX_F2FS_H */