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
  21 struct 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  */
  40 static 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  */
  51 struct 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
  73 static inline struct kernfs_node *kernfs_dentry_node(struct dentry *dentry)
  74 {
  75         if (d_really_is_negative(dentry))
  76                 return NULL;
  77         return d_inode(dentry)->i_private;
  78 }
  79
  80 extern const struct super_operations kernfs_sops;
  81 extern struct kmem_cache *kernfs_node_cache;
  82
  83 /*
  84  * inode.c
  85  */
  86 extern const struct xattr_handler *kernfs_xattr_handlers[];
  87 void kernfs_evict_inode(struct inode *inode);
  88 int kernfs_iop_permission(struct inode *inode, int mask);
  89 int kernfs_iop_setattr(struct dentry *dentry, struct iattr *iattr);
  90 int kernfs_iop_getattr(const struct path *path, struct kstat *stat,
  91                        u32 request_mask, unsigned int query_flags);
  92 ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size);
  93
  94 /*
  95  * dir.c
  96  */
  97 extern struct mutex kernfs_mutex;
  98 extern const struct dentry_operations kernfs_dops;
  99 extern const struct file_operations kernfs_dir_fops;
 100 extern const struct inode_operations kernfs_dir_iops;
 101
 102 struct kernfs_node *kernfs_get_active(struct kernfs_node *kn);
 103 void kernfs_put_active(struct kernfs_node *kn);
 104 int kernfs_add_one(struct kernfs_node *kn);
 105 struct kernfs_node *kernfs_new_node(struct kernfs_node *parent,
 106                                     const char *name, umode_t mode,
 107                                     unsigned flags);
 108 struct kernfs_node *kernfs_find_and_get_node_by_ino(struct kernfs_root *root,
 109                                                     unsigned int ino);
 110
 111 /*
 112  * file.c
 113  */
 114 extern const struct file_operations kernfs_file_fops;
 115
 116 void kernfs_drain_open_files(struct kernfs_node *kn);
 117
 118 /*
 119  * symlink.c
 120  */
 121 extern const struct inode_operations kernfs_symlink_iops;
 122
 123 #endif  /* __KERNFS_INTERNAL_H */