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 #define KN_DEACTIVATED_BIAS INT_MIN 30 31 /* KERNFS_TYPE_MASK and types are defined in include/linux/kernfs.h */ 32 33 /** 34 * kernfs_root - find out the kernfs_root a kernfs_node belongs to 35 * @kn: kernfs_node of interest 36 * 37 * Return the kernfs_root @kn belongs to. 38 */ 39 static inline struct kernfs_root *kernfs_root(struct kernfs_node *kn) 40 { 41 /* if parent exists, it's always a dir; otherwise, @sd is a dir */ 42 if (kn->parent) 43 kn = kn->parent; 44 return kn->dir.root; 45 } 46 47 /* 48 * Context structure to be used while adding/removing nodes. 49 */ 50 struct kernfs_addrm_cxt { 51 struct kernfs_node *removed; 52 }; 53 54 /* 55 * mount.c 56 */ 57 struct kernfs_super_info { 58 /* 59 * The root associated with this super_block. Each super_block is 60 * identified by the root and ns it's associated with. 61 */ 62 struct kernfs_root *root; 63 64 /* 65 * Each sb is associated with one namespace tag, currently the 66 * network namespace of the task which mounted this kernfs 67 * instance. If multiple tags become necessary, make the following 68 * an array and compare kernfs_node tag against every entry. 69 */ 70 const void *ns; 71 }; 72 #define kernfs_info(SB) ((struct kernfs_super_info *)(SB->s_fs_info)) 73 74 extern struct kmem_cache *kernfs_node_cache; 75 76 /* 77 * inode.c 78 */ 79 struct inode *kernfs_get_inode(struct super_block *sb, struct kernfs_node *kn); 80 void kernfs_evict_inode(struct inode *inode); 81 int kernfs_iop_permission(struct inode *inode, int mask); 82 int kernfs_iop_setattr(struct dentry *dentry, struct iattr *iattr); 83 int kernfs_iop_getattr(struct vfsmount *mnt, struct dentry *dentry, 84 struct kstat *stat); 85 int kernfs_iop_setxattr(struct dentry *dentry, const char *name, const void *value, 86 size_t size, int flags); 87 int kernfs_iop_removexattr(struct dentry *dentry, const char *name); 88 ssize_t kernfs_iop_getxattr(struct dentry *dentry, const char *name, void *buf, 89 size_t size); 90 ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size); 91 void kernfs_inode_init(void); 92 93 /* 94 * dir.c 95 */ 96 extern struct mutex kernfs_mutex; 97 extern const struct dentry_operations kernfs_dops; 98 extern const struct file_operations kernfs_dir_fops; 99 extern const struct inode_operations kernfs_dir_iops; 100 101 struct kernfs_node *kernfs_get_active(struct kernfs_node *kn); 102 void kernfs_put_active(struct kernfs_node *kn); 103 void kernfs_addrm_start(struct kernfs_addrm_cxt *acxt); 104 int kernfs_add_one(struct kernfs_addrm_cxt *acxt, struct kernfs_node *kn); 105 void kernfs_addrm_finish(struct kernfs_addrm_cxt *acxt); 106 struct kernfs_node *kernfs_new_node(struct kernfs_node *parent, 107 const char *name, umode_t mode, 108 unsigned flags); 109 110 /* 111 * file.c 112 */ 113 extern const struct file_operations kernfs_file_fops; 114 115 void kernfs_unmap_bin_file(struct kernfs_node *kn); 116 117 /* 118 * symlink.c 119 */ 120 extern const struct inode_operations kernfs_symlink_iops; 121 122 #endif /* __KERNFS_INTERNAL_H */ 123