kernel部分数据结构列表七(地址空间对象)

2009-12-20 13:18| 发布者: admin| 查看: 41| 评论: 0|原作者: 琴姬

/*
*Linux页高速缓存实用化address_space结构体描述页高速缓存中的页面
*定义文件在linux/fs.h中
*/
struct address_space {
struct inode *host; /* 拥有节点 */
struct radix_tree_root page_tree; /* 包含全部页面的radix树 */
spinlock_t tree_lock; /* 保护page_tree的自旋锁 */
unsigned int i_mmap_writable; /* VM_SHARED记数 */
struct prio_tree_root i_mmap; /* 似有映射链表 */
struct list_head i_mmap_nonlinear; /* VM_NONLINEAR链表 */
spinlock_t i_mmap_lock; /* 保护i_mmap的自旋锁 */
atomic_t truncate_count; /* 截断记数 */
unsigned long nrpages; /* 页总数 */
pgoff_t writeback_index; /* 回写的起始偏移 */
struct address_space_operations *a_ops; /* 操作表 */
unsigned long flags; /* gfp_mask掩码与错误标识 */
struct backing_dev_info *backing_dev_info; /* 预读信息 */
spinlock_t private_lock; /* 私有address_space锁 */
struct list_head private_list; /* 私有address_space链表 */
struct address_space *assoc_mapping; /* 相关的缓冲 */
};
/*
*a_ops域指向地址空间对象中的操作函数表，操作函数表定义在文件linux/fs.h中
*由address_space_operations 结构体来表示
*/
struct address_space_operations {
int (*writepage)(struct page *, struct writeback_control *);
int (*readpage) (struct file *, struct page *);
int (*sync_page) (struct page *);
int (*writepages) (struct address_space *, struct writeback_control *);
int (*set_page_dirty) (struct page *);
int (*readpages) (struct file *, struct address_space *,
struct list_head *, unsigned);
int (*prepare_write) (struct file *, struct page *, unsigned, unsigned);
int (*commit_write) (struct file *, struct page *, unsigned, unsigned);
sector_t (*bmap)(struct address_space *, sector_t);
int (*invalidatepage) (struct page *, unsigned long);
int (*releasepage) (struct page *, int);
int (*direct_IO) (int, struct kiocb *, const struct iovec *,
loff_t, unsigned long);
};

收藏分享邀请

		自动登录	找回密码
密码			注册

kernel部分数据结构列表七(地址空间对象)

最新评论

相关分类