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 /* 53 * The root associated with this super_block. Each super_block is 54 * identified by the root and ns it's associated with. 55 */ 56 struct kernfs_root *root; 57 58 /* 59 * Each sb is associated with one namespace tag, currently the 60 * network namespace of the task which mounted this kernfs 61 * instance. If multiple tags become necessary, make the following 62 * an array and compare kernfs_node tag against every entry. 63 */ 64 const void *ns; 65 }; 66 #define kernfs_info(SB) ((struct kernfs_super_info *)(SB->s_fs_info)) 67 68 extern const struct super_operations kernfs_sops; 69 extern struct kmem_cache *kernfs_node_cache; 70 71 /* 72 * inode.c 73 */ 74 struct inode *kernfs_get_inode(struct super_block *sb, struct kernfs_node *kn); 75 void kernfs_evict_inode(struct inode *inode); 76 int kernfs_iop_permission(struct inode *inode, int mask); 77 int kernfs_iop_setattr(struct dentry *dentry, struct iattr *iattr); 78 int kernfs_iop_getattr(struct vfsmount *mnt, struct dentry *dentry, 79 struct kstat *stat); 80 int kernfs_iop_setxattr(struct dentry *dentry, const char *name, const void *value, 81 size_t size, int flags); 82 int kernfs_iop_removexattr(struct dentry *dentry, const char *name); 83 ssize_t kernfs_iop_getxattr(struct dentry *dentry, const char *name, void *buf, 84 size_t size); 85 ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size); 86 void kernfs_inode_init(void); 87 88 /* 89 * dir.c 90 */ 91 extern struct mutex kernfs_mutex; 92 extern const struct dentry_operations kernfs_dops; 93 extern const struct file_operations kernfs_dir_fops; 94 extern const struct inode_operations kernfs_dir_iops; 95 96 struct kernfs_node *kernfs_get_active(struct kernfs_node *kn); 97 void kernfs_put_active(struct kernfs_node *kn); 98 int kernfs_add_one(struct kernfs_node *kn); 99 struct kernfs_node *kernfs_new_node(struct kernfs_node *parent, 100 const char *name, umode_t mode, 101 unsigned flags); 102 103 /* 104 * file.c 105 */ 106 extern const struct file_operations kernfs_file_fops; 107 108 void kernfs_unmap_bin_file(struct kernfs_node *kn); 109 110 /* 111 * symlink.c 112 */ 113 extern const struct inode_operations kernfs_symlink_iops; 114 115 #endif /* __KERNFS_INTERNAL_H */ 116