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