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