diff options
Diffstat (limited to 'fs/configfs/configfs_internal.h')
| -rw-r--r-- | fs/configfs/configfs_internal.h | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/fs/configfs/configfs_internal.h b/fs/configfs/configfs_internal.h new file mode 100644 index 0000000000..e710a17823 --- /dev/null +++ b/fs/configfs/configfs_internal.h @@ -0,0 +1,159 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * 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 mnt_idmap *idmap, + 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 mnt_idmap *idmap, + 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); +} + |