VFS四大对象之三 struct dentry

 1 struct dentry {
 2     /* RCU lookup touched fields */
 3     unsigned int d_flags;        /* protected by d_lock */
 4     seqcount_t d_seq;        /* per dentry seqlock */
 5     struct hlist_bl_node d_hash;    /* lookup hash list */
 6     struct dentry *d_parent;    /* parent directory */
 7     struct qstr d_name;
 8     struct inode *d_inode;        /* Where the name belongs to - NULL is
 9                      * negative */
10     unsigned char d_iname[DNAME_INLINE_LEN];    /* small names */
11 
12     /* Ref lookup also touches following */
13     unsigned int d_count;        /* protected by d_lock */
14     spinlock_t d_lock;        /* per dentry lock */
15     const struct dentry_operations *d_op;
16     struct super_block *d_sb;    /* The root of the dentry tree */
17     unsigned long d_time;        /* used by d_revalidate */
18     void *d_fsdata;            /* fs-specific data */
19 
20     struct list_head d_lru;        /* LRU list */
21     /*
22      * d_child and d_rcu can share memory
23      */
24     union {
25         struct list_head d_child;    /* child of parent list */
26          struct rcu_head d_rcu;
27     } d_u;
28     struct list_head d_subdirs;    /* our children */
29     struct list_head d_alias;    /* inode alias list */
30 };