linux的debugfs机制

debugfs是linux中用户层与内核层的的一种数据交互方式。

debugfs相关函数定义在 linux.debugfs.h 文件中，实现在linux.debugfs.c文件中。重要函数有下面几个。

创建和撤销目录及文件

struct dentry *debugfs_create_dir(const char *name, struct dentry *parent);
struct dentry *debugfs_create_file(const char *name, mode_t mode, 
        struct dentry *parent, void *data, 
        const struct file_operations *fops);
void debugfs_remove(struct dentry *dentry);
void debugfs_remove_recursive(struct dentry *dentry);

创建单值文件：

struct dentry *debugfs_create_u8(const char *name, mode_t mode, 
        struct dentry *parent, u8 *value);
struct dentry *debugfs_create_u16(const char *name, mode_t mode, 
        struct dentry *parent, u16 *value);
struct dentry *debugfs_create_u32(const char *name, mode_t mode, 
        struct dentry *parent, u32 *value);
struct dentry *debugfs_create_u64(const char *name, mode_t mode, 
        struct dentry *parent, u64 *value);

struct dentry *debugfs_create_x8(const char *name, mode_t mode, 
        struct dentry *parent, u8 *value);
struct dentry *debugfs_create_x16(const char *name, mode_t mode, 
        struct dentry *parent, u16 *value);
struct dentry *debugfs_create_x32(const char *name, mode_t mode, 
        struct dentry *parent, u32 *value);

struct dentry *debugfs_create_size_t(const char *name, mode_t mode, 
        struct dentry *parent, size_t *value);
struct dentry *debugfs_create_bool(const char *name, mode_t mode, 
        struct dentry *parent, u32 *value);

主要参考：
Linux内核里的DebugFS http://www.cnblogs.com/wwang/archive/2011/01/17/1937609.html
debugfs的例程 https://github.com/chadversary/debugfs-tutorial
http://blog.techveda.org/debugfs/

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