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/*

 * fs/sysfs/sysfs.h - sysfs internal header file

 *

 * Copyright (c) 2001-3 Patrick Mochel

 * Copyright (c) 2007 SUSE Linux Products GmbH

 * Copyright (c) 2007 Tejun Heo <teheo@suse.de>

 *

 * This file is released under the GPLv2.

 */

struct sysfs_open_dirent;

/* type-specific structures for sysfs_dirent->s_* union members */

struct sysfs_elem_dir {

        struct kobject          *kobj;

        /* children list starts here and goes through sd->s_sibling */

        struct sysfs_dirent     *children;

};

struct sysfs_elem_symlink {

        struct sysfs_dirent     *target_sd;

};

struct sysfs_elem_attr {

        struct attribute        *attr;

        struct sysfs_open_dirent *open;

};

struct sysfs_elem_bin_attr {

        struct bin_attribute    *bin_attr;

};

/*

 * sysfs_dirent - the building block of sysfs hierarchy.  Each and

 * every sysfs node is represented by single sysfs_dirent.

 *

 * As long as s_count reference is held, the sysfs_dirent itself is

 * accessible.  Dereferencing s_elem or any other outer entity

 * requires s_active reference.

 */

struct sysfs_dirent {

        atomic_t                s_count;

        atomic_t                s_active;

        struct sysfs_dirent     *s_parent;

        struct sysfs_dirent     *s_sibling;

        const char              *s_name;

        union {

                struct sysfs_elem_dir           s_dir;

                struct sysfs_elem_symlink       s_symlink;

                struct sysfs_elem_attr          s_attr;

                struct sysfs_elem_bin_attr      s_bin_attr;

        };

        unsigned int            s_flags;

        ino_t                   s_ino;

        umode_t                 s_mode;

        struct iattr            *s_iattr;

};

#define SD_DEACTIVATED_BIAS             INT_MIN

#define SYSFS_TYPE_MASK                 0x00ff

#define SYSFS_DIR                       0x0001

#define SYSFS_KOBJ_ATTR                 0x0002

#define SYSFS_KOBJ_BIN_ATTR             0x0004

#define SYSFS_KOBJ_LINK                 0x0008

#define SYSFS_COPY_NAME                 (SYSFS_DIR | SYSFS_KOBJ_LINK)

#define SYSFS_FLAG_MASK                 ~SYSFS_TYPE_MASK

#define SYSFS_FLAG_REMOVED              0x0200

static inline unsigned int sysfs_type(struct sysfs_dirent *sd)

{

        return sd->s_flags & SYSFS_TYPE_MASK;

}

/*

 * Context structure to be used while adding/removing nodes.

 */

struct sysfs_addrm_cxt {

        struct sysfs_dirent     *parent_sd;

        struct inode            *parent_inode;

        struct sysfs_dirent     *removed;

        int                     cnt;

};

/*

 * mount.c

 */

extern struct sysfs_dirent sysfs_root;

extern struct super_block *sysfs_sb;

extern struct kmem_cache *sysfs_dir_cachep;

/*

 * dir.c

 */

extern struct mutex sysfs_mutex;

extern struct mutex sysfs_rename_mutex;

extern spinlock_t sysfs_assoc_lock;

extern const struct file_operations sysfs_dir_operations;

extern const struct inode_operations sysfs_dir_inode_operations;

struct dentry *sysfs_get_dentry(struct sysfs_dirent *sd);

struct sysfs_dirent *sysfs_get_active_two(struct sysfs_dirent *sd);

void sysfs_put_active_two(struct sysfs_dirent *sd);

void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt,

                       struct sysfs_dirent *parent_sd);

int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd);

void sysfs_remove_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd);

void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt);

struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd,

                                       const unsigned char *name);

struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd,

                                      const unsigned char *name);

struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type);

void release_sysfs_dirent(struct sysfs_dirent *sd);

int sysfs_create_subdir(struct kobject *kobj, const char *name,

                        struct sysfs_dirent **p_sd);

void sysfs_remove_subdir(struct sysfs_dirent *sd);

static inline struct sysfs_dirent *sysfs_get(struct sysfs_dirent *sd)

{

        if (sd) {

                WARN_ON(!atomic_read(&sd->s_count));

                atomic_inc(&sd->s_count);

        }

        return sd;

}

static inline void sysfs_put(struct sysfs_dirent *sd)

{

        if (sd && atomic_dec_and_test(&sd->s_count))

                release_sysfs_dirent(sd);

}

/*

 * inode.c

 */

struct inode *sysfs_get_inode(struct sysfs_dirent *sd);

int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);

int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name);

int sysfs_inode_init(void);

/*

 * file.c

 */

extern const struct file_operations sysfs_file_operations;

int sysfs_add_file(struct sysfs_dirent *dir_sd,

                   const struct attribute *attr, int type);

/*

 * bin.c

 */

extern const struct file_operations bin_fops;

/*

 * symlink.c

 */

extern const struct inode_operations sysfs_symlink_inode_operations;