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 atomic_t nr_user_xattrs; 30 atomic_t user_xattr_size; 31 }; 32 33 /* +1 to avoid triggering overflow warning when negating it */ 34 #define KN_DEACTIVATED_BIAS (INT_MIN + 1) 35 36 /* KERNFS_TYPE_MASK and types are defined in include/linux/kernfs.h */ 37 38 /** 39 * kernfs_root - find out the kernfs_root a kernfs_node belongs to 40 * @kn: kernfs_node of interest 41 * 42 * Return the kernfs_root @kn belongs to. 43 */ 44 static inline struct kernfs_root *kernfs_root(struct kernfs_node *kn) 45 { 46 /* if parent exists, it's always a dir; otherwise, @sd is a dir */ 47 if (kn->parent) 48 kn = kn->parent; 49 return kn->dir.root; 50 } 51 52 /* 53 * mount.c 54 */ 55 struct kernfs_super_info { 56 struct super_block *sb; 57 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 /* anchored at kernfs_root->supers, protected by kernfs_mutex */ 73 struct list_head node; 74 }; 75 #define kernfs_info(SB) ((struct kernfs_super_info *)(SB->s_fs_info)) 76 77 static inline struct kernfs_node *kernfs_dentry_node(struct dentry *dentry) 78 { 79 if (d_really_is_negative(dentry)) 80 return NULL; 81 return d_inode(dentry)->i_private; 82 } 83 84 extern const struct super_operations kernfs_sops; 85 extern struct kmem_cache *kernfs_node_cache, *kernfs_iattrs_cache; 86 87 /* 88 * inode.c 89 */ 90 extern const struct xattr_handler *kernfs_xattr_handlers[]; 91 void kernfs_evict_inode(struct inode *inode); 92 int kernfs_iop_permission(struct user_namespace *mnt_userns, 93 struct inode *inode, int mask); 94 int kernfs_iop_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, 95 struct iattr *iattr); 96 int kernfs_iop_getattr(struct user_namespace *mnt_userns, 97 const struct path *path, struct kstat *stat, 98 u32 request_mask, unsigned int query_flags); 99 ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size); 100 int __kernfs_setattr(struct kernfs_node *kn, const struct iattr *iattr); 101 102 /* 103 * dir.c 104 */ 105 extern struct mutex kernfs_mutex; 106 extern const struct dentry_operations kernfs_dops; 107 extern const struct file_operations kernfs_dir_fops; 108 extern const struct inode_operations kernfs_dir_iops; 109 110 struct kernfs_node *kernfs_get_active(struct kernfs_node *kn); 111 void kernfs_put_active(struct kernfs_node *kn); 112 int kernfs_add_one(struct kernfs_node *kn); 113 struct kernfs_node *kernfs_new_node(struct kernfs_node *parent, 114 const char *name, umode_t mode, 115 kuid_t uid, kgid_t gid, 116 unsigned flags); 117 118 /* 119 * file.c 120 */ 121 extern const struct file_operations kernfs_file_fops; 122 123 void kernfs_drain_open_files(struct kernfs_node *kn); 124 125 /* 126 * symlink.c 127 */ 128 extern const struct inode_operations kernfs_symlink_iops; 129 130 #endif /* __KERNFS_INTERNAL_H */ 131