include/linux/fs.h1319 struct super_block {1320   struct list_head        s_list;         /* Keep this first */1321   dev_t             s_dev;     /* search index; _not_ kdev_t */1322   unsigned char           s_dirt;1323   unsigned char           s_blocksize_bits;1324   unsigned long           s_blocksize;1325   loff_t                  s_maxbytes;     /* Max file size */1326   struct file_system_type *s_type;1327   const struct super_operations   *s_op;1328   const struct dquot_operations   *dq_op;1329   const struct quotactl_ops       *s_qcop;1330   const struct export_operations *s_export_op;1331   unsigned long           s_flags;1332   unsigned long           s_magic;1333   struct dentry           *s_root;1334   struct rw_semaphore     s_umount;1335   struct mutex            s_lock;1336   int                     s_count;1337   int                     s_need_sync;1338   atomic_t                s_active;1339 #ifdef CONFIG_SECURITY1340   void                    *s_security;1341 #endif1342   struct xattr_handler    **s_xattr;13431344   struct list_head        s_inodes;       /* all inodes */1345   struct hlist_head  s_anon;/* anonymous dentries for (nfs) exporting */1346   struct list_head        s_files;1347   /* s_dentry_lru and s_nr_dentry_unused are protected by dcache_lock */1348   struct list_head        s_dentry_lru;   /* unused dentry lru */1349   int          s_nr_dentry_unused;     /* # of dentry on lru */13501351   struct block_device     *s_bdev;1352   struct backing_dev_info *s_bdi;1353   struct mtd_info         *s_mtd;1354   struct list_head        s_instances;1355   struct quota_info  s_dquot;  /* Diskquota specific options */13561357   int                     s_frozen;1358   wait_queue_head_t       s_wait_unfrozen;13591360   char s_id[32];                   /* Informational name */13611362   void            *s_fs_info;     /* Filesystem private info */1363   fmode_t                 s_mode;13641365   /* Granularity of c/m/atime in ns.1366      Cannot be worse than a second */1367   u32                s_time_gran;13681369 /*1370  * The next field is for VFS *only*. No filesystems have any business1371  * even looking at it. You had been warned.1372  */1373   struct mutex s_vfs_rename_mutex;        /* Kludge */13741375 /*1376  * Filesystem subtype.  If non-empty the filesystem type field1377  * in /proc/mounts will be "type.subtype"1378  */1379   char *s_subtype;13801381   /*1382    * Saved mount options for lazy filesystems using1383    * generic_show_options()1384    */1385   char *s_options;1386 };

include/linux/fs.h
1558 struct super_operations {1559   struct inode *(*alloc_inode)(struct super_block *sb);1560   void (*destroy_inode)(struct inode *);15611562   void (*dirty_inode) (struct inode *);1563 int (*write_inode) (struct inode *, struct writeback_control *wbc);1564   void (*drop_inode) (struct inode *);1565   void (*delete_inode) (struct inode *);1566   void (*put_super) (struct super_block *);1567   void (*write_super) (struct super_block *);1568   int (*sync_fs)(struct super_block *sb, int wait);1569   int (*freeze_fs) (struct super_block *);1570   int (*unfreeze_fs) (struct super_block *);1571   int (*statfs) (struct dentry *, struct kstatfs *);1572   int (*remount_fs) (struct super_block *, int *, char *);1573   void (*clear_inode) (struct inode *);1574   void (*umount_begin) (struct super_block *);15751576   int (*show_options)(struct seq_file *, struct vfsmount *);1577   int (*show_stats)(struct seq_file *, struct vfsmount *);1578 #ifdef CONFIG_QUOTA1579   ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);1580   ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);1581 #endif1582   int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t);1583 };

include/linux/fs.h
struct inode {struct hlist_node  i_hash; /* 用于散列链表的指针 *//* 用于描述索引节点当前状态的链表的指针 */struct list_head   i_list;     /* backing dev IO list */struct list_head  i_sb_list; /* 用于超级块的索引节点链表的指针 */struct list_head   i_dentry; /* 引用索引节点的目录项对象链表的头 */unsigned long      i_ino;    /* 索引节点号 */atomic_t    i_count;      /* 索引节点引用计数 */unsigned int    i_nlink;   /* 硬链接数目*/uid_t       i_uid;gid_t       i_gid;dev_t       i_rdev;unsigned int    i_blkbits; /* 块的位数 */u64         i_version;loff_t      i_size; /* 文件的字节数 */#ifdef __NEED_I_SIZE_ORDEREDseqcount_t      i_size_seqcount;#endifstruct timespec    i_atime;struct timespec    i_mtime;struct timespec    i_ctime;blkcnt_t    i_blocks;  /* 文件的块数*/unsigned short          i_bytes; /* 文件中最后一个块的字节数*/umode_t         i_mode;spinlock_t      i_lock;  /* i_blocks, i_bytes, maybe i_size */struct mutex    i_mutex;struct rw_semaphore   i_alloc_sem;const struct inode_operations  *i_op;/* former ->i_op->default_file_ops */const struct file_operations *i_fop;struct super_block *i_sb;struct file_lock   *i_flock; /* 指向文件锁链表的指针 */struct address_space  *i_mapping;struct address_space  i_data;#ifdef CONFIG_QUOTAstruct dquot    *i_dquot[MAXQUOTAS];#endif/* 用于具体的字符或块设备索引节点链表的指针，针对于设备文件 */struct list_head   i_devices;union {    /* 特殊文件专用 */struct pipe_inode_info   *i_pipe;struct block_device   *i_bdev;struct cdev     *i_cdev;};__u32 i_generation;   /*索引节点版本号（由某些文件系统使用）*/#ifdef CONFIG_FSNOTIFY__u32 i_fsnotify_mask; /* all events this inode cares about */struct hlist_head  i_fsnotify_mark_entries; /* fsnotify mark entries */#endif#ifdef CONFIG_INOTIFYstruct list_head   inotify_watches; /* watches on this inode */struct mutex    inotify_mutex;  /* protects the watches list */#endifunsigned long      i_state;  /* 索引节点的状态标志，如dirty等 */unsigned long      dirtied_when;   /* jiffies of first dirtying */unsigned int    i_flags; /* 文件系统的安装标志*/atomic_t    i_writecount; /* 用于写进程的引用计数 */#ifdef CONFIG_SECURITYvoid        *i_security;#endif#ifdef CONFIG_FS_POSIX_ACLstruct posix_acl   *i_acl;struct posix_acl   *i_default_acl;#endifvoid        *i_private; /* fs or device private pointer */};

include/linux/fs.hstruct inode_operations {int (*create) (struct inode *,struct dentry *,int, struct nameidata *);struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *);int (*link) (struct dentry *,struct inode *,struct dentry *);int (*unlink) (struct inode *,struct dentry *);int (*symlink) (struct inode *,struct dentry *,const char *);int (*mkdir) (struct inode *,struct dentry *,int);int (*rmdir) (struct inode *,struct dentry *);int (*mknod) (struct inode *,struct dentry *,int,dev_t);int (*rename) (struct inode *, struct dentry *,struct inode *, struct dentry *);int (*readlink) (struct dentry *, char __user *,int);void * (*follow_link) (struct dentry *, struct nameidata *);void (*put_link) (struct dentry *, struct nameidata *, void *);void (*truncate) (struct inode *);int (*permission) (struct inode *, int);int (*check_acl)(struct inode *, int);int (*setattr) (struct dentry *, struct iattr *);int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);ssize_t (*listxattr) (struct dentry *, char *, size_t);int (*removexattr) (struct dentry *, const char *);void (*truncate_range)(struct inode *, loff_t, loff_t);long (*fallocate)(struct inode *inode, int mode, loff_t offset,loff_t len);int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start,u64 len);};

include/linux/dcache.hstruct dentry {atomic_t d_count;/* 目录项高速缓存标志 */unsigned int d_flags;    /* protected by d_lock */spinlock_t d_lock;    /* per dentry lock *//* 对于目录而言，用于记录安装该目录项的文件系统的计数器*/int d_mounted;struct inode *d_inode;      /* Where the name belongs to - NULL is* negative *//** The next three fields are touched by __d_lookup.  Place them here* so they all fit in a cache line.*/struct hlist_node d_hash;   /* lookup hash list */struct dentry *d_parent; /* parent directory */struct qstr d_name;  /* 文件名 *//* 用于未使用目录项链表的指针 */struct list_head d_lru;     /* LRU list *//** d_child and d_rcu can share memory*/union {/* 对于目录而言，用于同一父目录中的目录项链表的指针 */struct list_head d_child;   /* child of parent list *//* 回收目录项对象时，有RCU描述符使用 */struct rcu_head d_rcu;} d_u;/* 对于目录而言，子目录项链表的头 */struct list_head d_subdirs; /* our children *//* 用于与同一索引节点相关的目录项链表指针 */struct list_head d_alias;   /* inode alias list */unsigned long d_time;    /* used by d_revalidate */const struct dentry_operations *d_op;struct super_block *d_sb;   /* The root of the dentry tree */void *d_fsdata;       /* fs-specific data */unsigned char d_iname[DNAME_INLINE_LEN_MIN];   /* small names */};

include/linux/dcache.hstruct dentry_operations {int (*d_revalidate)(struct dentry *, struct nameidata *);int (*d_hash) (struct dentry *, struct qstr *);int (*d_compare) (struct dentry *, struct qstr *, struct qstr *);int (*d_delete)(struct dentry *);void (*d_release)(struct dentry *);void (*d_iput)(struct dentry *, struct inode *);char *(*d_dname)(struct dentry *, char *, int);};

include/linux/fs.h
struct file {/** fu_list becomes invalid after file_free is called and queued via* fu_rcuhead for RCU freeing*/union {struct list_head   fu_list;struct rcu_head    fu_rcuhead;} f_u;struct path     f_path;#define f_dentry   f_path.dentry /* 与文件相关的目录项 */#define f_vfsmnt   f_path.mnt /* 含有该文件的已安装文件系统 */const struct file_operations   *f_op; /* 指向文件操作表的指针 */spinlock_t      f_lock;  /* f_ep_links, f_flags, no IRQ */atomic_long_t      f_count; /* 文件对象的引用计数 */unsigned int       f_flags; /* 打开文件时所制定的标志 */fmode_t         f_mode; /* 进程的访问模式 */loff_t      f_pos; /* 文件指针 */struct fown_struct f_owner; /* 通过信号进行I/O时间通知的数据 */const struct cred  *f_cred; /* 进程环境相关信息 */struct file_ra_state  f_ra; /* 文件预读状态 */u64         f_version; /* 版本号，每次使用后自动递增 */#ifdef CONFIG_SECURITYvoid        *f_security;#endif/* needed for tty driver, and maybe others */void        *private_data;#ifdef CONFIG_EPOLL/* Used by fs/eventpoll.c to link all the hooks to this file */struct list_head   f_ep_links;#endif /* #ifdef CONFIG_EPOLL */struct address_space  *f_mapping; /* 指向文件地址空间对象的指针 */#ifdef CONFIG_DEBUG_WRITECOUNTunsigned long f_mnt_write_state;#endif};

include/linux/cred.h
struct cred {atomic_t usage;#ifdef CONFIG_DEBUG_CREDENTIALSatomic_t subscribers; /* number of processes subscribed */void     *put_addr;unsigned magic;#define CRED_MAGIC 0x43736564#define CRED_MAGIC_DEAD  0x44656144#endifuid_t    uid;     /* real UID of the task */gid_t    gid;     /* real GID of the task */uid_t    suid;    /* saved UID of the task */gid_t    sgid;    /* saved GID of the task */uid_t    euid;    /* effective UID of the task */gid_t    egid;    /* effective GID of the task */uid_t    fsuid;   /* UID for VFS ops */gid_t    fsgid;   /* GID for VFS ops */unsigned securebits; /* SUID-less security management */kernel_cap_t cap_inheritable; /* caps our children can inherit */kernel_cap_t cap_permitted;  /* caps we're permitted */kernel_cap_t cap_effective;  /* caps we can actually use */kernel_cap_t cap_bset; /* capability bounding set */#ifdef CONFIG_KEYSunsigned char   jit_keyring; /* default keyring to attach requested* keys to */struct key  *thread_keyring; /* keyring private to this thread */struct key  *request_key_auth; /* assumed request_key authority */struct thread_group_cred *tgcred; /* thread-group shared credentials */#endif#ifdef CONFIG_SECURITYvoid     *security;  /* subjective LSM security */#endifstruct user_struct *user;   /* real user ID subscription */struct group_info *group_info; /* supplementary groups for euid/fsgid */struct rcu_head rcu;     /* RCU deletion hook */};

include/linux/fs.h
struct file_operations {struct module *owner;loff_t (*llseek) (struct file *, loff_t, int);ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t);ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t);int (*readdir) (struct file *, void *, filldir_t);unsigned int (*poll) (struct file *, struct poll_table_struct *);int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);long (*compat_ioctl) (struct file *, unsigned int, unsigned long);int (*mmap) (struct file *, struct vm_area_struct *);int (*open) (struct inode *, struct file *);int (*flush) (struct file *, fl_owner_t id);int (*release) (struct inode *, struct file *);int (*fsync) (struct file *, struct dentry *, int datasync);int (*aio_fsync) (struct kiocb *, int datasync);int (*fasync) (int, struct file *, int);int (*lock) (struct file *, int, struct file_lock *);ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);int (*check_flags)(int);int (*flock) (struct file *, int, struct file_lock *);ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);int (*setlease)(struct file *, long, struct file_lock **);};