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