include/linux/configfs.h

Source file repositories/reference/linux-study-clean/include/linux/configfs.h

File Facts

System
Linux kernel
Corpus path
include/linux/configfs.h
Extension
.h
Size
8852 bytes
Lines
278
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct config_item {
	char			*ci_name;
	char			ci_namebuf[CONFIGFS_ITEM_NAME_LEN];
	struct kref		ci_kref;
	struct list_head	ci_entry;
	struct config_item	*ci_parent;
	struct config_group	*ci_group;
	const struct config_item_type	*ci_type;
	struct dentry		*ci_dentry;
};

extern __printf(2, 3)
int config_item_set_name(struct config_item *, const char *, ...);

static inline char *config_item_name(struct config_item * item)
{
	return item->ci_name;
}

extern void config_item_init_type_name(struct config_item *item,
				       const char *name,
				       const struct config_item_type *type);

extern struct config_item *config_item_get(struct config_item *);
extern struct config_item *config_item_get_unless_zero(struct config_item *);
extern void config_item_put(struct config_item *);

struct config_item_type {
	struct module				*ct_owner;
	const struct configfs_item_operations	*ct_item_ops;
	const struct configfs_group_operations	*ct_group_ops;
	struct configfs_attribute		**ct_attrs;
	struct configfs_bin_attribute		**ct_bin_attrs;
};

/**
 *	group - a group of config_items of a specific type, belonging
 *	to a specific subsystem.
 */
struct config_group {
	struct config_item		cg_item;
	struct list_head		cg_children;
	struct configfs_subsystem 	*cg_subsys;
	struct list_head		default_groups;
	struct list_head		group_entry;
};

extern void config_group_init(struct config_group *group);
extern void config_group_init_type_name(struct config_group *group,
					const char *name,
					const struct config_item_type *type);

static inline struct config_group *to_config_group(struct config_item *item)
{
	return item ? container_of(item,struct config_group,cg_item) : NULL;
}

static inline struct config_group *config_group_get(struct config_group *group)
{
	return group ? to_config_group(config_item_get(&group->cg_item)) : NULL;
}

static inline void config_group_put(struct config_group *group)
{
	config_item_put(&group->cg_item);
}

extern struct config_item *config_group_find_item(struct config_group *,
						  const char *);


static inline void configfs_add_default_group(struct config_group *new_group,
		struct config_group *group)
{
	list_add_tail(&new_group->group_entry, &group->default_groups);
}

struct configfs_attribute {
	const char		*ca_name;
	struct module 		*ca_owner;
	umode_t			ca_mode;
	ssize_t (*show)(struct config_item *, char *);
	ssize_t (*store)(struct config_item *, const char *, size_t);
};

#define CONFIGFS_ATTR_PERM(_pfx, _name, _perm)		\
static struct configfs_attribute _pfx##attr_##_name = {	\
	.ca_name	= __stringify(_name),		\
	.ca_mode	= _perm,			\
	.ca_owner	= THIS_MODULE,			\

Annotation

Implementation Notes