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-rw-r--r--fs/configfs/configfs_internal.h159
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);
+}
+