Tejun Heo | b8441ed | 2013-11-24 09:54:58 -0500 | [diff] [blame] | 1 | /* |
| 2 | * kernfs.h - pseudo filesystem decoupled from vfs locking |
| 3 | * |
| 4 | * This file is released under the GPLv2. |
| 5 | */ |
| 6 | |
| 7 | #ifndef __LINUX_KERNFS_H |
| 8 | #define __LINUX_KERNFS_H |
| 9 | |
Tejun Heo | 879f40d | 2013-11-23 17:21:49 -0500 | [diff] [blame] | 10 | #include <linux/kernel.h> |
Tejun Heo | 5d0e26b | 2013-11-23 17:21:50 -0500 | [diff] [blame] | 11 | #include <linux/err.h> |
Tejun Heo | dd8a5b0 | 2013-11-28 14:54:20 -0500 | [diff] [blame] | 12 | #include <linux/list.h> |
| 13 | #include <linux/mutex.h> |
Tejun Heo | bc75555 | 2013-11-28 14:54:41 -0500 | [diff] [blame] | 14 | #include <linux/idr.h> |
Tejun Heo | 517e64f | 2013-11-28 14:54:29 -0500 | [diff] [blame] | 15 | #include <linux/lockdep.h> |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 16 | #include <linux/rbtree.h> |
| 17 | #include <linux/atomic.h> |
| 18 | #include <linux/completion.h> |
Tejun Heo | 879f40d | 2013-11-23 17:21:49 -0500 | [diff] [blame] | 19 | |
Tejun Heo | 5d60418 | 2013-11-23 17:21:52 -0500 | [diff] [blame] | 20 | struct file; |
| 21 | struct iattr; |
Tejun Heo | dd8a5b0 | 2013-11-28 14:54:20 -0500 | [diff] [blame] | 22 | struct seq_file; |
| 23 | struct vm_area_struct; |
Tejun Heo | 4b93dc9 | 2013-11-28 14:54:43 -0500 | [diff] [blame] | 24 | struct super_block; |
| 25 | struct file_system_type; |
Tejun Heo | 5d60418 | 2013-11-23 17:21:52 -0500 | [diff] [blame] | 26 | |
Tejun Heo | c525aad | 2013-12-11 14:11:55 -0500 | [diff] [blame^] | 27 | struct kernfs_open_node; |
| 28 | struct kernfs_iattrs; |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 29 | |
| 30 | enum kernfs_node_type { |
| 31 | SYSFS_DIR = 0x0001, |
| 32 | SYSFS_KOBJ_ATTR = 0x0002, |
| 33 | SYSFS_KOBJ_LINK = 0x0004, |
| 34 | }; |
| 35 | |
| 36 | #define SYSFS_TYPE_MASK 0x000f |
| 37 | #define SYSFS_COPY_NAME (SYSFS_DIR | SYSFS_KOBJ_LINK) |
| 38 | #define SYSFS_ACTIVE_REF SYSFS_KOBJ_ATTR |
| 39 | #define SYSFS_FLAG_MASK ~SYSFS_TYPE_MASK |
| 40 | |
| 41 | enum kernfs_node_flag { |
| 42 | SYSFS_FLAG_REMOVED = 0x0010, |
| 43 | SYSFS_FLAG_NS = 0x0020, |
| 44 | SYSFS_FLAG_HAS_SEQ_SHOW = 0x0040, |
| 45 | SYSFS_FLAG_HAS_MMAP = 0x0080, |
| 46 | SYSFS_FLAG_LOCKDEP = 0x0100, |
| 47 | }; |
| 48 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 49 | /* type-specific structures for kernfs_node union members */ |
| 50 | struct kernfs_elem_dir { |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 51 | unsigned long subdirs; |
Tejun Heo | adc5e8b | 2013-12-11 14:11:54 -0500 | [diff] [blame] | 52 | /* children rbtree starts here and goes through kn->rb */ |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 53 | struct rb_root children; |
| 54 | |
| 55 | /* |
| 56 | * The kernfs hierarchy this directory belongs to. This fits |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 57 | * better directly in kernfs_node but is here to save space. |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 58 | */ |
| 59 | struct kernfs_root *root; |
| 60 | }; |
| 61 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 62 | struct kernfs_elem_symlink { |
| 63 | struct kernfs_node *target_kn; |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 64 | }; |
| 65 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 66 | struct kernfs_elem_attr { |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 67 | const struct kernfs_ops *ops; |
Tejun Heo | c525aad | 2013-12-11 14:11:55 -0500 | [diff] [blame^] | 68 | struct kernfs_open_node *open; |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 69 | loff_t size; |
| 70 | }; |
| 71 | |
| 72 | /* |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 73 | * kernfs_node - the building block of kernfs hierarchy. Each and every |
| 74 | * kernfs node is represented by single kernfs_node. Most fields are |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 75 | * private to kernfs and shouldn't be accessed directly by kernfs users. |
| 76 | * |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 77 | * As long as s_count reference is held, the kernfs_node itself is |
| 78 | * accessible. Dereferencing elem or any other outer entity requires |
| 79 | * active reference. |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 80 | */ |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 81 | struct kernfs_node { |
Tejun Heo | adc5e8b | 2013-12-11 14:11:54 -0500 | [diff] [blame] | 82 | atomic_t count; |
| 83 | atomic_t active; |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 84 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 85 | struct lockdep_map dep_map; |
| 86 | #endif |
| 87 | /* the following two fields are published */ |
Tejun Heo | adc5e8b | 2013-12-11 14:11:54 -0500 | [diff] [blame] | 88 | struct kernfs_node *parent; |
| 89 | const char *name; |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 90 | |
Tejun Heo | adc5e8b | 2013-12-11 14:11:54 -0500 | [diff] [blame] | 91 | struct rb_node rb; |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 92 | |
| 93 | union { |
| 94 | struct completion *completion; |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 95 | struct kernfs_node *removed_list; |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 96 | } u; |
| 97 | |
Tejun Heo | adc5e8b | 2013-12-11 14:11:54 -0500 | [diff] [blame] | 98 | const void *ns; /* namespace tag */ |
| 99 | unsigned int hash; /* ns + name hash */ |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 100 | union { |
Tejun Heo | adc5e8b | 2013-12-11 14:11:54 -0500 | [diff] [blame] | 101 | struct kernfs_elem_dir dir; |
| 102 | struct kernfs_elem_symlink symlink; |
| 103 | struct kernfs_elem_attr attr; |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 104 | }; |
| 105 | |
| 106 | void *priv; |
| 107 | |
Tejun Heo | adc5e8b | 2013-12-11 14:11:54 -0500 | [diff] [blame] | 108 | unsigned short flags; |
| 109 | umode_t mode; |
| 110 | unsigned int ino; |
Tejun Heo | c525aad | 2013-12-11 14:11:55 -0500 | [diff] [blame^] | 111 | struct kernfs_iattrs *iattr; |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 112 | }; |
Tejun Heo | b8441ed | 2013-11-24 09:54:58 -0500 | [diff] [blame] | 113 | |
Tejun Heo | ba7443b | 2013-11-28 14:54:40 -0500 | [diff] [blame] | 114 | struct kernfs_root { |
| 115 | /* published fields */ |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 116 | struct kernfs_node *kn; |
Tejun Heo | bc75555 | 2013-11-28 14:54:41 -0500 | [diff] [blame] | 117 | |
| 118 | /* private fields, do not use outside kernfs proper */ |
| 119 | struct ida ino_ida; |
Tejun Heo | ba7443b | 2013-11-28 14:54:40 -0500 | [diff] [blame] | 120 | }; |
| 121 | |
Tejun Heo | c525aad | 2013-12-11 14:11:55 -0500 | [diff] [blame^] | 122 | struct kernfs_open_file { |
Tejun Heo | dd8a5b0 | 2013-11-28 14:54:20 -0500 | [diff] [blame] | 123 | /* published fields */ |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 124 | struct kernfs_node *kn; |
Tejun Heo | dd8a5b0 | 2013-11-28 14:54:20 -0500 | [diff] [blame] | 125 | struct file *file; |
| 126 | |
| 127 | /* private fields, do not use outside kernfs proper */ |
| 128 | struct mutex mutex; |
| 129 | int event; |
| 130 | struct list_head list; |
| 131 | |
| 132 | bool mmapped; |
| 133 | const struct vm_operations_struct *vm_ops; |
| 134 | }; |
| 135 | |
Tejun Heo | f6acf8b | 2013-11-28 14:54:21 -0500 | [diff] [blame] | 136 | struct kernfs_ops { |
| 137 | /* |
| 138 | * Read is handled by either seq_file or raw_read(). |
| 139 | * |
Tejun Heo | d19b984 | 2013-11-28 14:54:26 -0500 | [diff] [blame] | 140 | * If seq_show() is present, seq_file path is active. Other seq |
| 141 | * operations are optional and if not implemented, the behavior is |
| 142 | * equivalent to single_open(). @sf->private points to the |
Tejun Heo | c525aad | 2013-12-11 14:11:55 -0500 | [diff] [blame^] | 143 | * associated kernfs_open_file. |
Tejun Heo | f6acf8b | 2013-11-28 14:54:21 -0500 | [diff] [blame] | 144 | * |
| 145 | * read() is bounced through kernel buffer and a read larger than |
| 146 | * PAGE_SIZE results in partial operation of PAGE_SIZE. |
| 147 | */ |
| 148 | int (*seq_show)(struct seq_file *sf, void *v); |
| 149 | |
Tejun Heo | d19b984 | 2013-11-28 14:54:26 -0500 | [diff] [blame] | 150 | void *(*seq_start)(struct seq_file *sf, loff_t *ppos); |
| 151 | void *(*seq_next)(struct seq_file *sf, void *v, loff_t *ppos); |
| 152 | void (*seq_stop)(struct seq_file *sf, void *v); |
| 153 | |
Tejun Heo | c525aad | 2013-12-11 14:11:55 -0500 | [diff] [blame^] | 154 | ssize_t (*read)(struct kernfs_open_file *of, char *buf, size_t bytes, |
Tejun Heo | f6acf8b | 2013-11-28 14:54:21 -0500 | [diff] [blame] | 155 | loff_t off); |
| 156 | |
| 157 | /* |
| 158 | * write() is bounced through kernel buffer and a write larger than |
| 159 | * PAGE_SIZE results in partial operation of PAGE_SIZE. |
| 160 | */ |
Tejun Heo | c525aad | 2013-12-11 14:11:55 -0500 | [diff] [blame^] | 161 | ssize_t (*write)(struct kernfs_open_file *of, char *buf, size_t bytes, |
Tejun Heo | f6acf8b | 2013-11-28 14:54:21 -0500 | [diff] [blame] | 162 | loff_t off); |
| 163 | |
Tejun Heo | c525aad | 2013-12-11 14:11:55 -0500 | [diff] [blame^] | 164 | int (*mmap)(struct kernfs_open_file *of, struct vm_area_struct *vma); |
Tejun Heo | 517e64f | 2013-11-28 14:54:29 -0500 | [diff] [blame] | 165 | |
| 166 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 167 | struct lock_class_key lockdep_key; |
| 168 | #endif |
Tejun Heo | f6acf8b | 2013-11-28 14:54:21 -0500 | [diff] [blame] | 169 | }; |
| 170 | |
Tejun Heo | 879f40d | 2013-11-23 17:21:49 -0500 | [diff] [blame] | 171 | #ifdef CONFIG_SYSFS |
| 172 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 173 | static inline enum kernfs_node_type sysfs_type(struct kernfs_node *kn) |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 174 | { |
Tejun Heo | adc5e8b | 2013-12-11 14:11:54 -0500 | [diff] [blame] | 175 | return kn->flags & SYSFS_TYPE_MASK; |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 176 | } |
| 177 | |
| 178 | /** |
| 179 | * kernfs_enable_ns - enable namespace under a directory |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 180 | * @kn: directory of interest, should be empty |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 181 | * |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 182 | * This is to be called right after @kn is created to enable namespace |
| 183 | * under it. All children of @kn must have non-NULL namespace tags and |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 184 | * only the ones which match the super_block's tag will be visible. |
| 185 | */ |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 186 | static inline void kernfs_enable_ns(struct kernfs_node *kn) |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 187 | { |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 188 | WARN_ON_ONCE(sysfs_type(kn) != SYSFS_DIR); |
Tejun Heo | adc5e8b | 2013-12-11 14:11:54 -0500 | [diff] [blame] | 189 | WARN_ON_ONCE(!RB_EMPTY_ROOT(&kn->dir.children)); |
| 190 | kn->flags |= SYSFS_FLAG_NS; |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 191 | } |
| 192 | |
Tejun Heo | ac9bba0 | 2013-11-29 17:19:09 -0500 | [diff] [blame] | 193 | /** |
| 194 | * kernfs_ns_enabled - test whether namespace is enabled |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 195 | * @kn: the node to test |
Tejun Heo | ac9bba0 | 2013-11-29 17:19:09 -0500 | [diff] [blame] | 196 | * |
| 197 | * Test whether namespace filtering is enabled for the children of @ns. |
| 198 | */ |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 199 | static inline bool kernfs_ns_enabled(struct kernfs_node *kn) |
Tejun Heo | ac9bba0 | 2013-11-29 17:19:09 -0500 | [diff] [blame] | 200 | { |
Tejun Heo | adc5e8b | 2013-12-11 14:11:54 -0500 | [diff] [blame] | 201 | return kn->flags & SYSFS_FLAG_NS; |
Tejun Heo | ac9bba0 | 2013-11-29 17:19:09 -0500 | [diff] [blame] | 202 | } |
| 203 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 204 | struct kernfs_node *kernfs_find_and_get_ns(struct kernfs_node *parent, |
| 205 | const char *name, const void *ns); |
| 206 | void kernfs_get(struct kernfs_node *kn); |
| 207 | void kernfs_put(struct kernfs_node *kn); |
Tejun Heo | ccf73cf | 2013-11-28 14:54:30 -0500 | [diff] [blame] | 208 | |
Tejun Heo | ba7443b | 2013-11-28 14:54:40 -0500 | [diff] [blame] | 209 | struct kernfs_root *kernfs_create_root(void *priv); |
| 210 | void kernfs_destroy_root(struct kernfs_root *root); |
| 211 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 212 | struct kernfs_node *kernfs_create_dir_ns(struct kernfs_node *parent, |
| 213 | const char *name, void *priv, |
| 214 | const void *ns); |
| 215 | struct kernfs_node *kernfs_create_file_ns_key(struct kernfs_node *parent, |
| 216 | const char *name, |
| 217 | umode_t mode, loff_t size, |
| 218 | const struct kernfs_ops *ops, |
| 219 | void *priv, const void *ns, |
| 220 | struct lock_class_key *key); |
| 221 | struct kernfs_node *kernfs_create_link(struct kernfs_node *parent, |
| 222 | const char *name, |
| 223 | struct kernfs_node *target); |
| 224 | void kernfs_remove(struct kernfs_node *kn); |
| 225 | int kernfs_remove_by_name_ns(struct kernfs_node *parent, const char *name, |
Tejun Heo | 879f40d | 2013-11-23 17:21:49 -0500 | [diff] [blame] | 226 | const void *ns); |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 227 | int kernfs_rename_ns(struct kernfs_node *kn, struct kernfs_node *new_parent, |
Tejun Heo | 890ece1 | 2013-11-23 17:21:51 -0500 | [diff] [blame] | 228 | const char *new_name, const void *new_ns); |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 229 | int kernfs_setattr(struct kernfs_node *kn, const struct iattr *iattr); |
| 230 | void kernfs_notify(struct kernfs_node *kn); |
Tejun Heo | 879f40d | 2013-11-23 17:21:49 -0500 | [diff] [blame] | 231 | |
Tejun Heo | 4b93dc9 | 2013-11-28 14:54:43 -0500 | [diff] [blame] | 232 | const void *kernfs_super_ns(struct super_block *sb); |
| 233 | struct dentry *kernfs_mount_ns(struct file_system_type *fs_type, int flags, |
| 234 | struct kernfs_root *root, const void *ns); |
| 235 | void kernfs_kill_sb(struct super_block *sb); |
| 236 | |
| 237 | void kernfs_init(void); |
| 238 | |
Tejun Heo | 879f40d | 2013-11-23 17:21:49 -0500 | [diff] [blame] | 239 | #else /* CONFIG_SYSFS */ |
| 240 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 241 | static inline enum kernfs_node_type sysfs_type(struct kernfs_node *kn) |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 242 | { return 0; } /* whatever */ |
| 243 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 244 | static inline void kernfs_enable_ns(struct kernfs_node *kn) { } |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 245 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 246 | static inline bool kernfs_ns_enabled(struct kernfs_node *kn) |
Tejun Heo | ac9bba0 | 2013-11-29 17:19:09 -0500 | [diff] [blame] | 247 | { return false; } |
| 248 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 249 | static inline struct kernfs_node * |
| 250 | kernfs_find_and_get_ns(struct kernfs_node *parent, const char *name, |
Tejun Heo | ccf73cf | 2013-11-28 14:54:30 -0500 | [diff] [blame] | 251 | const void *ns) |
| 252 | { return NULL; } |
| 253 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 254 | static inline void kernfs_get(struct kernfs_node *kn) { } |
| 255 | static inline void kernfs_put(struct kernfs_node *kn) { } |
Tejun Heo | ccf73cf | 2013-11-28 14:54:30 -0500 | [diff] [blame] | 256 | |
Tejun Heo | ba7443b | 2013-11-28 14:54:40 -0500 | [diff] [blame] | 257 | static inline struct kernfs_root *kernfs_create_root(void *priv) |
| 258 | { return ERR_PTR(-ENOSYS); } |
| 259 | |
| 260 | static inline void kernfs_destroy_root(struct kernfs_root *root) { } |
| 261 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 262 | static inline struct kernfs_node * |
| 263 | kernfs_create_dir_ns(struct kernfs_node *parent, const char *name, void *priv, |
Tejun Heo | 93b2b8e | 2013-11-28 14:54:15 -0500 | [diff] [blame] | 264 | const void *ns) |
| 265 | { return ERR_PTR(-ENOSYS); } |
| 266 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 267 | static inline struct kernfs_node * |
| 268 | kernfs_create_file_ns_key(struct kernfs_node *parent, const char *name, |
Tejun Heo | 517e64f | 2013-11-28 14:54:29 -0500 | [diff] [blame] | 269 | umode_t mode, loff_t size, |
| 270 | const struct kernfs_ops *ops, void *priv, |
| 271 | const void *ns, struct lock_class_key *key) |
Tejun Heo | 496f739 | 2013-11-28 14:54:24 -0500 | [diff] [blame] | 272 | { return ERR_PTR(-ENOSYS); } |
| 273 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 274 | static inline struct kernfs_node * |
| 275 | kernfs_create_link(struct kernfs_node *parent, const char *name, |
| 276 | struct kernfs_node *target) |
Tejun Heo | 5d0e26b | 2013-11-23 17:21:50 -0500 | [diff] [blame] | 277 | { return ERR_PTR(-ENOSYS); } |
| 278 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 279 | static inline void kernfs_remove(struct kernfs_node *kn) { } |
Tejun Heo | 879f40d | 2013-11-23 17:21:49 -0500 | [diff] [blame] | 280 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 281 | static inline int kernfs_remove_by_name_ns(struct kernfs_node *kn, |
Tejun Heo | 879f40d | 2013-11-23 17:21:49 -0500 | [diff] [blame] | 282 | const char *name, const void *ns) |
| 283 | { return -ENOSYS; } |
| 284 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 285 | static inline int kernfs_rename_ns(struct kernfs_node *kn, |
| 286 | struct kernfs_node *new_parent, |
Tejun Heo | 890ece1 | 2013-11-23 17:21:51 -0500 | [diff] [blame] | 287 | const char *new_name, const void *new_ns) |
| 288 | { return -ENOSYS; } |
| 289 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 290 | static inline int kernfs_setattr(struct kernfs_node *kn, |
Tejun Heo | 5d60418 | 2013-11-23 17:21:52 -0500 | [diff] [blame] | 291 | const struct iattr *iattr) |
| 292 | { return -ENOSYS; } |
| 293 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 294 | static inline void kernfs_notify(struct kernfs_node *kn) { } |
Tejun Heo | 024f647 | 2013-11-28 14:54:27 -0500 | [diff] [blame] | 295 | |
Tejun Heo | 4b93dc9 | 2013-11-28 14:54:43 -0500 | [diff] [blame] | 296 | static inline const void *kernfs_super_ns(struct super_block *sb) |
| 297 | { return NULL; } |
| 298 | |
| 299 | static inline struct dentry * |
| 300 | kernfs_mount_ns(struct file_system_type *fs_type, int flags, |
| 301 | struct kernfs_root *root, const void *ns) |
| 302 | { return ERR_PTR(-ENOSYS); } |
| 303 | |
| 304 | static inline void kernfs_kill_sb(struct super_block *sb) { } |
| 305 | |
| 306 | static inline void kernfs_init(void) { } |
| 307 | |
Tejun Heo | 879f40d | 2013-11-23 17:21:49 -0500 | [diff] [blame] | 308 | #endif /* CONFIG_SYSFS */ |
| 309 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 310 | static inline struct kernfs_node * |
| 311 | kernfs_find_and_get(struct kernfs_node *kn, const char *name) |
Tejun Heo | ccf73cf | 2013-11-28 14:54:30 -0500 | [diff] [blame] | 312 | { |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 313 | return kernfs_find_and_get_ns(kn, name, NULL); |
Tejun Heo | ccf73cf | 2013-11-28 14:54:30 -0500 | [diff] [blame] | 314 | } |
| 315 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 316 | static inline struct kernfs_node * |
| 317 | kernfs_create_dir(struct kernfs_node *parent, const char *name, void *priv) |
Tejun Heo | 93b2b8e | 2013-11-28 14:54:15 -0500 | [diff] [blame] | 318 | { |
| 319 | return kernfs_create_dir_ns(parent, name, priv, NULL); |
| 320 | } |
| 321 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 322 | static inline struct kernfs_node * |
| 323 | kernfs_create_file_ns(struct kernfs_node *parent, const char *name, |
Tejun Heo | 517e64f | 2013-11-28 14:54:29 -0500 | [diff] [blame] | 324 | umode_t mode, loff_t size, const struct kernfs_ops *ops, |
| 325 | void *priv, const void *ns) |
| 326 | { |
| 327 | struct lock_class_key *key = NULL; |
| 328 | |
| 329 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 330 | key = (struct lock_class_key *)&ops->lockdep_key; |
| 331 | #endif |
| 332 | return kernfs_create_file_ns_key(parent, name, mode, size, ops, priv, |
| 333 | ns, key); |
| 334 | } |
| 335 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 336 | static inline struct kernfs_node * |
| 337 | kernfs_create_file(struct kernfs_node *parent, const char *name, umode_t mode, |
Tejun Heo | 496f739 | 2013-11-28 14:54:24 -0500 | [diff] [blame] | 338 | loff_t size, const struct kernfs_ops *ops, void *priv) |
| 339 | { |
| 340 | return kernfs_create_file_ns(parent, name, mode, size, ops, priv, NULL); |
| 341 | } |
| 342 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 343 | static inline int kernfs_remove_by_name(struct kernfs_node *parent, |
Tejun Heo | 879f40d | 2013-11-23 17:21:49 -0500 | [diff] [blame] | 344 | const char *name) |
| 345 | { |
| 346 | return kernfs_remove_by_name_ns(parent, name, NULL); |
| 347 | } |
| 348 | |
Tejun Heo | 4b93dc9 | 2013-11-28 14:54:43 -0500 | [diff] [blame] | 349 | static inline struct dentry * |
| 350 | kernfs_mount(struct file_system_type *fs_type, int flags, |
| 351 | struct kernfs_root *root) |
| 352 | { |
| 353 | return kernfs_mount_ns(fs_type, flags, root, NULL); |
| 354 | } |
| 355 | |
Tejun Heo | b8441ed | 2013-11-24 09:54:58 -0500 | [diff] [blame] | 356 | #endif /* __LINUX_KERNFS_H */ |