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 #define KN_DEACTIVATED_BIAS             INT_MIN
  30
  31 /* KERNFS_TYPE_MASK and types are defined in include/linux/kernfs.h */
  32
  33 /**
  34  * kernfs_root - find out the kernfs_root a kernfs_node belongs to
  35  * @kn: kernfs_node of interest
  36  *
  37  * Return the kernfs_root @kn belongs to.
  38  */
  39 static inline struct kernfs_root *kernfs_root(struct kernfs_node *kn)
  40 {
  41         /* if parent exists, it's always a dir; otherwise, @sd is a dir */
  42         if (kn->parent)
  43                 kn = kn->parent;
  44         return kn->dir.root;
  45 }
  46
  47 /*
  48  * Context structure to be used while adding/removing nodes.
  49  */
  50 struct kernfs_addrm_cxt {
  51         struct kernfs_node      *removed;
  52 };
  53
  54 /*
  55  * mount.c
  56  */
  57 struct kernfs_super_info {
  58         /*
  59          * The root associated with this super_block.  Each super_block is
  60          * identified by the root and ns it's associated with.
  61          */
  62         struct kernfs_root      *root;
  63
  64         /*
  65          * Each sb is associated with one namespace tag, currently the
  66          * network namespace of the task which mounted this kernfs
  67          * instance.  If multiple tags become necessary, make the following
  68          * an array and compare kernfs_node tag against every entry.
  69          */
  70         const void              *ns;
  71 };
  72 #define kernfs_info(SB) ((struct kernfs_super_info *)(SB->s_fs_info))
  73
  74 extern struct kmem_cache *kernfs_node_cache;
  75
  76 /*
  77  * inode.c
  78  */
  79 struct inode *kernfs_get_inode(struct super_block *sb, struct kernfs_node *kn);
  80 void kernfs_evict_inode(struct inode *inode);
  81 int kernfs_iop_permission(struct inode *inode, int mask);
  82 int kernfs_iop_setattr(struct dentry *dentry, struct iattr *iattr);
  83 int kernfs_iop_getattr(struct vfsmount *mnt, struct dentry *dentry,
  84                        struct kstat *stat);
  85 int kernfs_iop_setxattr(struct dentry *dentry, const char *name, const void *value,
  86                         size_t size, int flags);
  87 int kernfs_iop_removexattr(struct dentry *dentry, const char *name);
  88 ssize_t kernfs_iop_getxattr(struct dentry *dentry, const char *name, void *buf,
  89                             size_t size);
  90 ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size);
  91 void kernfs_inode_init(void);
  92
  93 /*
  94  * dir.c
  95  */
  96 extern struct mutex kernfs_mutex;
  97 extern const struct dentry_operations kernfs_dops;
  98 extern const struct file_operations kernfs_dir_fops;
  99 extern const struct inode_operations kernfs_dir_iops;
 100
 101 struct kernfs_node *kernfs_get_active(struct kernfs_node *kn);
 102 void kernfs_put_active(struct kernfs_node *kn);
 103 void kernfs_addrm_start(struct kernfs_addrm_cxt *acxt);
 104 int kernfs_add_one(struct kernfs_addrm_cxt *acxt, struct kernfs_node *kn);
 105 void kernfs_addrm_finish(struct kernfs_addrm_cxt *acxt);
 106 struct kernfs_node *kernfs_new_node(struct kernfs_node *parent,
 107                                     const char *name, umode_t mode,
 108                                     unsigned flags);
 109
 110 /*
 111  * file.c
 112  */
 113 extern const struct file_operations kernfs_file_fops;
 114
 115 void kernfs_unmap_bin_file(struct kernfs_node *kn);
 116
 117 /*
 118  * symlink.c
 119  */
 120 extern const struct inode_operations kernfs_symlink_iops;
 121
 122 #endif  /* __KERNFS_INTERNAL_H */