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Linux/fs/kernfs/kernfs-internal.h

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  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 */
128 

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