http://blog.sina.com.cn/s/blog_5219094a01009a4e.html
inode
相關的數據結構爲:
struct inode {
struct hlist_node i_hash;
struct list_head i_list;
struct list_head i_sb_list;
struct list_head i_dentry;
unsigned long i_ino;
atomic_t i_count;
umode_t i_mode;
unsigned int i_nlink;
uid_t i_uid;
gid_t i_gid;
dev_t i_rdev;
loff_t i_size;
struct timespec i_atime;
struct timespec i_mtime;
struct timespec i_ctime;
unsigned int i_blkbits;
unsigned long i_blksize;
unsigned long i_version;
unsigned long i_blocks;
unsigned short i_bytes;
spinlock_t i_lock;
struct semaphore i_sem;
struct rw_semaphore i_alloc_sem;
struct inode_operations *i_op;
struct file_operations *i_fop;
struct super_block *i_sb;
struct file_lock *i_flock;
struct address_space *i_mapping;
struct address_space i_data;
#ifdef CONFIG_QUOTA
struct dquot *i_dquot[MAXQUOTAS];
#endif
struct list_head i_devices;
struct pipe_inode_info *i_pipe;
struct block_device *i_bdev;
struct cdev *i_cdev;
int i_cindex;
__u32 i_generation;
#ifdef CONFIG_DNOTIFY
unsigned long i_dnotify_mask;
struct dnotify_struct *i_dnotify;
#endif
unsigned long i_state;
unsigned long dirtied_when;
unsigned int i_flags;
atomic_t i_writecount;
void *i_security;
union {
void *generic_ip;
} u;
#ifdef __NEED_I_SIZE_ORDERED
seqcount_t i_size_seqcount;
#endif
};
inode存在於兩個雙向鏈表中:
一個是inode所在文件系統的super block的 s_inodes 鏈表中
一個是根據inode的使用狀態存在於以下三個鏈表中的某個鏈表中:
1. 未用的: inode_unused 鏈表
2. 正在使用的: inode_in_use 鏈表
3. 髒的: super block中的s_dirty 鏈表
另外,還有一個重要的鏈表: inode_hashtable(這個暫不介紹).
/------------\
/----------|super_blocks|---- .......... ---------------------\
| \------------/
