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 #include <linux/fs_context.h> 21 22 struct kernfs_iattrs { 23 kuid_t ia_uid; 24 kgid_t ia_gid; 25 struct timespec64 ia_atime; 26 struct timespec64 ia_mtime; 27 struct timespec64 ia_ctime; 28 29 struct simple_xattrs xattrs; 30 }; 31 32 /* +1 to avoid triggering overflow warning when negating it */ 33 #define KN_DEACTIVATED_BIAS (INT_MIN + 1) 34 35 /* KERNFS_TYPE_MASK and types are defined in include/linux/kernfs.h */ 36 37 /** 38 * kernfs_root - find out the kernfs_root a kernfs_node belongs to 39 * @kn: kernfs_node of interest 40 * 41 * Return the kernfs_root @kn belongs to. 42 */ 43 static inline struct kernfs_root *kernfs_root(struct kernfs_node *kn) 44 { 45 /* if parent exists, it's always a dir; otherwise, @sd is a dir */ 46 if (kn->parent) 47 kn = kn->parent; 48 return kn->dir.root; 49 } 50 51 /* 52 * mount.c 53 */ 54 struct kernfs_super_info { 55 struct super_block *sb; 56 57 /* 58 * The root associated with this super_block. Each super_block is 59 * identified by the root and ns it's associated with. 60 */ 61 struct kernfs_root *root; 62 63 /* 64 * Each sb is associated with one namespace tag, currently the 65 * network namespace of the task which mounted this kernfs 66 * instance. If multiple tags become necessary, make the following 67 * an array and compare kernfs_node tag against every entry. 68 */ 69 const void *ns; 70 71 /* anchored at kernfs_root->supers, protected by kernfs_mutex */ 72 struct list_head node; 73 }; 74 #define kernfs_info(SB) ((struct kernfs_super_info *)(SB->s_fs_info)) 75 76 static inline struct kernfs_node *kernfs_dentry_node(struct dentry *dentry) 77 { 78 if (d_really_is_negative(dentry)) 79 return NULL; 80 return d_inode(dentry)->i_private; 81 } 82 83 extern const struct super_operations kernfs_sops; 84 extern struct kmem_cache *kernfs_node_cache, *kernfs_iattrs_cache; 85 86 /* 87 * inode.c 88 */ 89 extern const struct xattr_handler *kernfs_xattr_handlers[]; 90 void kernfs_evict_inode(struct inode *inode); 91 int kernfs_iop_permission(struct inode *inode, int mask); 92 int kernfs_iop_setattr(struct dentry *dentry, struct iattr *iattr); 93 int kernfs_iop_getattr(const struct path *path, struct kstat *stat, 94 u32 request_mask, unsigned int query_flags); 95 ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size); 96 int __kernfs_setattr(struct kernfs_node *kn, const struct iattr *iattr); 97 98 /* 99 * dir.c 100 */ 101 extern struct mutex kernfs_mutex; 102 extern const struct dentry_operations kernfs_dops; 103 extern const struct file_operations kernfs_dir_fops; 104 extern const struct inode_operations kernfs_dir_iops; 105 106 struct kernfs_node *kernfs_get_active(struct kernfs_node *kn); 107 void kernfs_put_active(struct kernfs_node *kn); 108 int kernfs_add_one(struct kernfs_node *kn); 109 struct kernfs_node *kernfs_new_node(struct kernfs_node *parent, 110 const char *name, umode_t mode, 111 kuid_t uid, kgid_t gid, 112 unsigned flags); 113 struct kernfs_node *kernfs_find_and_get_node_by_ino(struct kernfs_root *root, 114 unsigned int ino); 115 116 /* 117 * file.c 118 */ 119 extern const struct file_operations kernfs_file_fops; 120 121 void kernfs_drain_open_files(struct kernfs_node *kn); 122 123 /* 124 * symlink.c 125 */ 126 extern const struct inode_operations kernfs_symlink_iops; 127 128 #endif /* __KERNFS_INTERNAL_H */ 129