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); 112 113 /* 114 * file.c 115 */ 116 extern const struct file_operations kernfs_file_fops; 117 118 void kernfs_drain_open_files(struct kernfs_node *kn); 119 120 /* 121 * symlink.c 122 */ 123 extern const struct inode_operations kernfs_symlink_iops; 124 125 #endif /* __KERNFS_INTERNAL_H */ 126