| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 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 | int __kernfs_setattr(struct kernfs_node *kn, const struct iattr *iattr); |
| 94 | |
| 95 | /* |
| 96 | * dir.c |
| 97 | */ |
| 98 | extern struct mutex kernfs_mutex; |
| 99 | extern const struct dentry_operations kernfs_dops; |
| 100 | extern const struct file_operations kernfs_dir_fops; |
| 101 | extern const struct inode_operations kernfs_dir_iops; |
| 102 | |
| 103 | struct kernfs_node *kernfs_get_active(struct kernfs_node *kn); |
| 104 | void kernfs_put_active(struct kernfs_node *kn); |
| 105 | int kernfs_add_one(struct kernfs_node *kn); |
| 106 | struct kernfs_node *kernfs_new_node(struct kernfs_node *parent, |
| 107 | const char *name, umode_t mode, |
| 108 | kuid_t uid, kgid_t gid, |
| 109 | unsigned flags); |
| 110 | struct kernfs_node *kernfs_find_and_get_node_by_ino(struct kernfs_root *root, |
| 111 | unsigned int ino); |
| 112 | |
| 113 | /* |
| 114 | * file.c |
| 115 | */ |
| 116 | extern const struct file_operations kernfs_file_fops; |
| 117 | |
| 118 | void kernfs_drain_open_files(struct kernfs_node *kn); |
| 119 | |
| 120 | /* |
| 121 | * symlink.c |
| 122 | */ |
| 123 | extern const struct inode_operations kernfs_symlink_iops; |
| 124 | |
| 125 | #endif /* __KERNFS_INTERNAL_H */ |