/* SPDX-License-Identifier: GPL-2.0-or-later */
|
/* -*- mode: c; c-basic-offset:8; -*-
|
* vim: noexpandtab sw=8 ts=8 sts=0:
|
*
|
* configfs_internal.h - Internal stuff for configfs
|
*
|
* Based on sysfs:
|
* sysfs is Copyright (C) 2001, 2002, 2003 Patrick Mochel
|
*
|
* configfs Copyright (C) 2005 Oracle. All rights reserved.
|
*/
|
|
#ifdef pr_fmt
|
#undef pr_fmt
|
#endif
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
#include <linux/slab.h>
|
#include <linux/list.h>
|
#include <linux/spinlock.h>
|
|
struct configfs_fragment {
|
atomic_t frag_count;
|
struct rw_semaphore frag_sem;
|
bool frag_dead;
|
};
|
|
void put_fragment(struct configfs_fragment *);
|
struct configfs_fragment *get_fragment(struct configfs_fragment *);
|
|
struct configfs_dirent {
|
atomic_t s_count;
|
int s_dependent_count;
|
struct list_head s_sibling;
|
struct list_head s_children;
|
int s_links;
|
void * s_element;
|
int s_type;
|
umode_t s_mode;
|
struct dentry * s_dentry;
|
struct iattr * s_iattr;
|
#ifdef CONFIG_LOCKDEP
|
int s_depth;
|
#endif
|
struct configfs_fragment *s_frag;
|
};
|
|
#define CONFIGFS_ROOT 0x0001
|
#define CONFIGFS_DIR 0x0002
|
#define CONFIGFS_ITEM_ATTR 0x0004
|
#define CONFIGFS_ITEM_BIN_ATTR 0x0008
|
#define CONFIGFS_ITEM_LINK 0x0020
|
#define CONFIGFS_USET_DIR 0x0040
|
#define CONFIGFS_USET_DEFAULT 0x0080
|
#define CONFIGFS_USET_DROPPING 0x0100
|
#define CONFIGFS_USET_IN_MKDIR 0x0200
|
#define CONFIGFS_USET_CREATING 0x0400
|
#define CONFIGFS_NOT_PINNED (CONFIGFS_ITEM_ATTR | CONFIGFS_ITEM_BIN_ATTR)
|
|
extern struct mutex configfs_symlink_mutex;
|
extern spinlock_t configfs_dirent_lock;
|
|
extern struct kmem_cache *configfs_dir_cachep;
|
|
extern int configfs_is_root(struct config_item *item);
|
|
extern struct inode * configfs_new_inode(umode_t mode, struct configfs_dirent *, struct super_block *);
|
extern struct inode *configfs_create(struct dentry *, umode_t mode);
|
|
extern int configfs_create_file(struct config_item *, const struct configfs_attribute *);
|
extern int configfs_create_bin_file(struct config_item *,
|
const struct configfs_bin_attribute *);
|
extern int configfs_make_dirent(struct configfs_dirent *, struct dentry *,
|
void *, umode_t, int, struct configfs_fragment *);
|
extern int configfs_dirent_is_ready(struct configfs_dirent *);
|
|
extern void configfs_hash_and_remove(struct dentry * dir, const char * name);
|
|
extern const unsigned char * configfs_get_name(struct configfs_dirent *sd);
|
extern void configfs_drop_dentry(struct configfs_dirent *sd, struct dentry *parent);
|
extern int configfs_setattr(struct dentry *dentry, struct iattr *iattr);
|
|
extern struct dentry *configfs_pin_fs(void);
|
extern void configfs_release_fs(void);
|
|
extern const struct file_operations configfs_dir_operations;
|
extern const struct file_operations configfs_file_operations;
|
extern const struct file_operations configfs_bin_file_operations;
|
extern const struct inode_operations configfs_dir_inode_operations;
|
extern const struct inode_operations configfs_root_inode_operations;
|
extern const struct inode_operations configfs_symlink_inode_operations;
|
extern const struct dentry_operations configfs_dentry_ops;
|
|
extern int configfs_symlink(struct inode *dir, struct dentry *dentry,
|
const char *symname);
|
extern int configfs_unlink(struct inode *dir, struct dentry *dentry);
|
|
int configfs_create_link(struct configfs_dirent *target, struct dentry *parent,
|
struct dentry *dentry, char *body);
|
|
static inline struct config_item * to_item(struct dentry * dentry)
|
{
|
struct configfs_dirent * sd = dentry->d_fsdata;
|
return ((struct config_item *) sd->s_element);
|
}
|
|
static inline struct configfs_attribute * to_attr(struct dentry * dentry)
|
{
|
struct configfs_dirent * sd = dentry->d_fsdata;
|
return ((struct configfs_attribute *) sd->s_element);
|
}
|
|
static inline struct configfs_bin_attribute *to_bin_attr(struct dentry *dentry)
|
{
|
struct configfs_attribute *attr = to_attr(dentry);
|
|
return container_of(attr, struct configfs_bin_attribute, cb_attr);
|
}
|
|
static inline struct config_item *configfs_get_config_item(struct dentry *dentry)
|
{
|
struct config_item * item = NULL;
|
|
spin_lock(&dentry->d_lock);
|
if (!d_unhashed(dentry)) {
|
struct configfs_dirent * sd = dentry->d_fsdata;
|
item = config_item_get(sd->s_element);
|
}
|
spin_unlock(&dentry->d_lock);
|
|
return item;
|
}
|
|
static inline void release_configfs_dirent(struct configfs_dirent * sd)
|
{
|
if (!(sd->s_type & CONFIGFS_ROOT)) {
|
kfree(sd->s_iattr);
|
put_fragment(sd->s_frag);
|
kmem_cache_free(configfs_dir_cachep, sd);
|
}
|
}
|
|
static inline struct configfs_dirent * configfs_get(struct configfs_dirent * sd)
|
{
|
if (sd) {
|
WARN_ON(!atomic_read(&sd->s_count));
|
atomic_inc(&sd->s_count);
|
}
|
return sd;
|
}
|
|
static inline void configfs_put(struct configfs_dirent * sd)
|
{
|
WARN_ON(!atomic_read(&sd->s_count));
|
if (atomic_dec_and_test(&sd->s_count))
|
release_configfs_dirent(sd);
|
}
|
