root/fs/kernfs/kernfs-internal.h

INCLUDED FROM

DEFINITIONS

1. kernfs_dentry_node

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * fs/kernfs/kernfs-internal.h - kernfs internal header file
   4  *
   5  * Copyright (c) 2001-3 Patrick Mochel
   6  * Copyright (c) 2007 SUSE Linux Products GmbH
   7  * Copyright (c) 2007, 2013 Tejun Heo <teheo@suse.de>
   8  */
   9 
  10 #ifndef __KERNFS_INTERNAL_H
  11 #define __KERNFS_INTERNAL_H
  12 
  13 #include <linux/lockdep.h>
  14 #include <linux/fs.h>
  15 #include <linux/mutex.h>
  16 #include <linux/xattr.h>
  17 
  18 #include <linux/kernfs.h>
  19 #include <linux/fs_context.h>
  20 
  21 struct kernfs_iattrs {
  22         kuid_t                  ia_uid;
  23         kgid_t                  ia_gid;
  24         struct timespec64       ia_atime;
  25         struct timespec64       ia_mtime;
  26         struct timespec64       ia_ctime;
  27 
  28         struct simple_xattrs    xattrs;
  29 };
  30 
  31 /* +1 to avoid triggering overflow warning when negating it */
  32 #define KN_DEACTIVATED_BIAS             (INT_MIN + 1)
  33 
  34 /* KERNFS_TYPE_MASK and types are defined in include/linux/kernfs.h */
  35 
  36 /**
  37  * kernfs_root - find out the kernfs_root a kernfs_node belongs to
  38  * @kn: kernfs_node of interest
  39  *
  40  * Return the kernfs_root @kn belongs to.
  41  */
  42 static inline struct kernfs_root *kernfs_root(struct kernfs_node *kn)
  43 {
  44         /* if parent exists, it's always a dir; otherwise, @sd is a dir */
  45         if (kn->parent)
  46                 kn = kn->parent;
  47         return kn->dir.root;
  48 }
  49 
  50 /*
  51  * mount.c
  52  */
  53 struct kernfs_super_info {
  54         struct super_block      *sb;
  55 
  56         /*
  57          * The root associated with this super_block.  Each super_block is
  58          * identified by the root and ns it's associated with.
  59          */
  60         struct kernfs_root      *root;
  61 
  62         /*
  63          * Each sb is associated with one namespace tag, currently the
  64          * network namespace of the task which mounted this kernfs
  65          * instance.  If multiple tags become necessary, make the following
  66          * an array and compare kernfs_node tag against every entry.
  67          */
  68         const void              *ns;
  69 
  70         /* anchored at kernfs_root->supers, protected by kernfs_mutex */
  71         struct list_head        node;
  72 };
  73 #define kernfs_info(SB) ((struct kernfs_super_info *)(SB->s_fs_info))
  74 
  75 static inline struct kernfs_node *kernfs_dentry_node(struct dentry *dentry)
  76 {
  77         if (d_really_is_negative(dentry))
  78                 return NULL;
  79         return d_inode(dentry)->i_private;
  80 }
  81 
  82 extern const struct super_operations kernfs_sops;
  83 extern struct kmem_cache *kernfs_node_cache, *kernfs_iattrs_cache;
  84 
  85 /*
  86  * inode.c
  87  */
  88 extern const struct xattr_handler *kernfs_xattr_handlers[];
  89 void kernfs_evict_inode(struct inode *inode);
  90 int kernfs_iop_permission(struct inode *inode, int mask);
  91 int kernfs_iop_setattr(struct dentry *dentry, struct iattr *iattr);
  92 int kernfs_iop_getattr(const struct path *path, struct kstat *stat,
  93                        u32 request_mask, unsigned int query_flags);
  94 ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size);
  95 int __kernfs_setattr(struct kernfs_node *kn, const struct iattr *iattr);
  96 
  97 /*
  98  * dir.c
  99  */
 100 extern struct mutex kernfs_mutex;
 101 extern const struct dentry_operations kernfs_dops;
 102 extern const struct file_operations kernfs_dir_fops;
 103 extern const struct inode_operations kernfs_dir_iops;
 104 
 105 struct kernfs_node *kernfs_get_active(struct kernfs_node *kn);
 106 void kernfs_put_active(struct kernfs_node *kn);
 107 int kernfs_add_one(struct kernfs_node *kn);
 108 struct kernfs_node *kernfs_new_node(struct kernfs_node *parent,
 109                                     const char *name, umode_t mode,
 110                                     kuid_t uid, kgid_t gid,
 111                                     unsigned flags);
 112 struct kernfs_node *kernfs_find_and_get_node_by_ino(struct kernfs_root *root,
 113                                                     unsigned int ino);
 114 
 115 /*
 116  * file.c
 117  */
 118 extern const struct file_operations kernfs_file_fops;
 119 
 120 void kernfs_drain_open_files(struct kernfs_node *kn);
 121 
 122 /*
 123  * symlink.c
 124  */
 125 extern const struct inode_operations kernfs_symlink_iops;
 126 
 127 #endif  /* __KERNFS_INTERNAL_H */