LXR linux/fs/kernfs/kernfs-internal.h

   1/*
   2 * fs/kernfs/kernfs-internal.h - kernfs internal header file
   3 *
   4 * Copyright (c) 2001-3 Patrick Mochel
   5 * Copyright (c) 2007 SUSE Linux Products GmbH
   6 * Copyright (c) 2007, 2013 Tejun Heo <teheo@suse.de>
   7 *
   8 * This file is released under the GPLv2.
   9 */
  10
  11#ifndef __KERNFS_INTERNAL_H
  12#define __KERNFS_INTERNAL_H
  13
  14#include <linux/lockdep.h>
  15#include <linux/fs.h>
  16#include <linux/mutex.h>
  17#include <linux/xattr.h>
  18
  19#include <linux/kernfs.h>
  20
  21struct kernfs_iattrs {
  22        struct iattr            ia_iattr;
  23        void                    *ia_secdata;
  24        u32                     ia_secdata_len;
  25
  26        struct simple_xattrs    xattrs;
  27};
  28
  29/* +1 to avoid triggering overflow warning when negating it */
  30#define KN_DEACTIVATED_BIAS             (INT_MIN + 1)
  31
  32/* KERNFS_TYPE_MASK and types are defined in include/linux/kernfs.h */
  33
  34/**
  35 * kernfs_root - find out the kernfs_root a kernfs_node belongs to
  36 * @kn: kernfs_node of interest
  37 *
  38 * Return the kernfs_root @kn belongs to.
  39 */
  40static inline struct kernfs_root *kernfs_root(struct kernfs_node *kn)
  41{
  42        /* if parent exists, it's always a dir; otherwise, @sd is a dir */
  43        if (kn->parent)
  44                kn = kn->parent;
  45        return kn->dir.root;
  46}
  47
  48/*
  49 * mount.c
  50 */
  51struct kernfs_super_info {
  52        struct super_block      *sb;
  53
  54        /*
  55         * The root associated with this super_block.  Each super_block is
  56         * identified by the root and ns it's associated with.
  57         */
  58        struct kernfs_root      *root;
  59
  60        /*
  61         * Each sb is associated with one namespace tag, currently the
  62         * network namespace of the task which mounted this kernfs
  63         * instance.  If multiple tags become necessary, make the following
  64         * an array and compare kernfs_node tag against every entry.
  65         */
  66        const void              *ns;
  67
  68        /* anchored at kernfs_root->supers, protected by kernfs_mutex */
  69        struct list_head        node;
  70};
  71#define kernfs_info(SB) ((struct kernfs_super_info *)(SB->s_fs_info))
  72
  73extern const struct super_operations kernfs_sops;
  74extern struct kmem_cache *kernfs_node_cache;
  75
  76/*
  77 * inode.c
  78 */
  79extern const struct xattr_handler *kernfs_xattr_handlers[];
  80void kernfs_evict_inode(struct inode *inode);
  81int kernfs_iop_permission(struct inode *inode, int mask);
  82int kernfs_iop_setattr(struct dentry *dentry, struct iattr *iattr);
  83int kernfs_iop_getattr(const struct path *path, struct kstat *stat,
  84                       u32 request_mask, unsigned int query_flags);
  85ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size);
  86
  87/*
  88 * dir.c
  89 */
  90extern struct mutex kernfs_mutex;
  91extern const struct dentry_operations kernfs_dops;
  92extern const struct file_operations kernfs_dir_fops;
  93extern const struct inode_operations kernfs_dir_iops;
  94
  95struct kernfs_node *kernfs_get_active(struct kernfs_node *kn);
  96void kernfs_put_active(struct kernfs_node *kn);
  97int kernfs_add_one(struct kernfs_node *kn);
  98struct kernfs_node *kernfs_new_node(struct kernfs_node *parent,
  99                                    const char *name, umode_t mode,
 100                                    unsigned flags);
 101
 102/*
 103 * file.c
 104 */
 105extern const struct file_operations kernfs_file_fops;
 106
 107void kernfs_drain_open_files(struct kernfs_node *kn);
 108
 109/*
 110 * symlink.c
 111 */
 112extern const struct inode_operations kernfs_symlink_iops;
 113
 114#endif  /* __KERNFS_INTERNAL_H */
 115