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> |
Greg Kroah-Hartman | 87da149 | 2014-01-13 14:43:11 -0800 | [diff] [blame] | 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; |
Tejun Heo | 917f56c | 2014-01-17 09:57:49 -0500 | [diff] [blame] | 21 | struct dentry; |
Tejun Heo | 5d60418 | 2013-11-23 17:21:52 -0500 | [diff] [blame] | 22 | struct iattr; |
Tejun Heo | dd8a5b0 | 2013-11-28 14:54:20 -0500 | [diff] [blame] | 23 | struct seq_file; |
| 24 | struct vm_area_struct; |
Tejun Heo | 4b93dc9 | 2013-11-28 14:54:43 -0500 | [diff] [blame] | 25 | struct super_block; |
| 26 | struct file_system_type; |
Tejun Heo | 5d60418 | 2013-11-23 17:21:52 -0500 | [diff] [blame] | 27 | |
Tejun Heo | c525aad | 2013-12-11 14:11:55 -0500 | [diff] [blame] | 28 | struct kernfs_open_node; |
| 29 | struct kernfs_iattrs; |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 30 | |
| 31 | enum kernfs_node_type { |
Tejun Heo | df23fc3 | 2013-12-11 14:11:56 -0500 | [diff] [blame] | 32 | KERNFS_DIR = 0x0001, |
| 33 | KERNFS_FILE = 0x0002, |
| 34 | KERNFS_LINK = 0x0004, |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 35 | }; |
| 36 | |
Tejun Heo | df23fc3 | 2013-12-11 14:11:56 -0500 | [diff] [blame] | 37 | #define KERNFS_TYPE_MASK 0x000f |
Greg Kroah-Hartman | 0890147 | 2014-01-13 14:39:52 -0800 | [diff] [blame] | 38 | #define KERNFS_ACTIVE_REF KERNFS_FILE |
Tejun Heo | df23fc3 | 2013-12-11 14:11:56 -0500 | [diff] [blame] | 39 | #define KERNFS_FLAG_MASK ~KERNFS_TYPE_MASK |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 40 | |
| 41 | enum kernfs_node_flag { |
Greg Kroah-Hartman | 798c75a | 2014-01-13 14:36:03 -0800 | [diff] [blame] | 42 | KERNFS_REMOVED = 0x0010, |
Tejun Heo | df23fc3 | 2013-12-11 14:11:56 -0500 | [diff] [blame] | 43 | KERNFS_NS = 0x0020, |
| 44 | KERNFS_HAS_SEQ_SHOW = 0x0040, |
| 45 | KERNFS_HAS_MMAP = 0x0080, |
| 46 | KERNFS_LOCKDEP = 0x0100, |
Tejun Heo | 2063d60 | 2013-12-11 16:02:57 -0500 | [diff] [blame] | 47 | KERNFS_STATIC_NAME = 0x0200, |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 48 | }; |
| 49 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 50 | /* type-specific structures for kernfs_node union members */ |
| 51 | struct kernfs_elem_dir { |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 52 | unsigned long subdirs; |
Tejun Heo | adc5e8b | 2013-12-11 14:11:54 -0500 | [diff] [blame] | 53 | /* children rbtree starts here and goes through kn->rb */ |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 54 | struct rb_root children; |
| 55 | |
| 56 | /* |
| 57 | * The kernfs hierarchy this directory belongs to. This fits |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 58 | * better directly in kernfs_node but is here to save space. |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 59 | */ |
| 60 | struct kernfs_root *root; |
| 61 | }; |
| 62 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 63 | struct kernfs_elem_symlink { |
| 64 | struct kernfs_node *target_kn; |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 65 | }; |
| 66 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 67 | struct kernfs_elem_attr { |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 68 | const struct kernfs_ops *ops; |
Tejun Heo | c525aad | 2013-12-11 14:11:55 -0500 | [diff] [blame] | 69 | struct kernfs_open_node *open; |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 70 | loff_t size; |
| 71 | }; |
| 72 | |
| 73 | /* |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 74 | * kernfs_node - the building block of kernfs hierarchy. Each and every |
| 75 | * kernfs node is represented by single kernfs_node. Most fields are |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 76 | * private to kernfs and shouldn't be accessed directly by kernfs users. |
| 77 | * |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 78 | * As long as s_count reference is held, the kernfs_node itself is |
| 79 | * accessible. Dereferencing elem or any other outer entity requires |
| 80 | * active reference. |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 81 | */ |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 82 | struct kernfs_node { |
Tejun Heo | adc5e8b | 2013-12-11 14:11:54 -0500 | [diff] [blame] | 83 | atomic_t count; |
| 84 | atomic_t active; |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 85 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 86 | struct lockdep_map dep_map; |
| 87 | #endif |
| 88 | /* the following two fields are published */ |
Tejun Heo | adc5e8b | 2013-12-11 14:11:54 -0500 | [diff] [blame] | 89 | struct kernfs_node *parent; |
| 90 | const char *name; |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 91 | |
Tejun Heo | adc5e8b | 2013-12-11 14:11:54 -0500 | [diff] [blame] | 92 | struct rb_node rb; |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 93 | |
Greg Kroah-Hartman | 7653fe9 | 2014-01-13 14:20:56 -0800 | [diff] [blame] | 94 | union { |
Greg Kroah-Hartman | 87da149 | 2014-01-13 14:43:11 -0800 | [diff] [blame] | 95 | struct completion *completion; |
Greg Kroah-Hartman | 7653fe9 | 2014-01-13 14:20:56 -0800 | [diff] [blame] | 96 | struct kernfs_node *removed_list; |
| 97 | } u; |
| 98 | |
Tejun Heo | adc5e8b | 2013-12-11 14:11:54 -0500 | [diff] [blame] | 99 | const void *ns; /* namespace tag */ |
Greg Kroah-Hartman | 9b0925a | 2014-01-13 14:09:38 -0800 | [diff] [blame] | 100 | unsigned int hash; /* ns + name hash */ |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 101 | union { |
Tejun Heo | adc5e8b | 2013-12-11 14:11:54 -0500 | [diff] [blame] | 102 | struct kernfs_elem_dir dir; |
| 103 | struct kernfs_elem_symlink symlink; |
| 104 | struct kernfs_elem_attr attr; |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 105 | }; |
| 106 | |
| 107 | void *priv; |
| 108 | |
Tejun Heo | adc5e8b | 2013-12-11 14:11:54 -0500 | [diff] [blame] | 109 | unsigned short flags; |
| 110 | umode_t mode; |
| 111 | unsigned int ino; |
Tejun Heo | c525aad | 2013-12-11 14:11:55 -0500 | [diff] [blame] | 112 | struct kernfs_iattrs *iattr; |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 113 | }; |
Tejun Heo | b8441ed | 2013-11-24 09:54:58 -0500 | [diff] [blame] | 114 | |
Tejun Heo | 80b9bbe | 2013-12-11 16:03:00 -0500 | [diff] [blame] | 115 | /* |
| 116 | * kernfs_dir_ops may be specified on kernfs_create_root() to support |
| 117 | * directory manipulation syscalls. These optional callbacks are invoked |
| 118 | * on the matching syscalls and can perform any kernfs operations which |
| 119 | * don't necessarily have to be the exact operation requested. |
| 120 | */ |
| 121 | struct kernfs_dir_ops { |
| 122 | int (*mkdir)(struct kernfs_node *parent, const char *name, |
| 123 | umode_t mode); |
| 124 | int (*rmdir)(struct kernfs_node *kn); |
| 125 | int (*rename)(struct kernfs_node *kn, struct kernfs_node *new_parent, |
| 126 | const char *new_name); |
| 127 | }; |
| 128 | |
Tejun Heo | ba7443b | 2013-11-28 14:54:40 -0500 | [diff] [blame] | 129 | struct kernfs_root { |
| 130 | /* published fields */ |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 131 | struct kernfs_node *kn; |
Tejun Heo | bc75555 | 2013-11-28 14:54:41 -0500 | [diff] [blame] | 132 | |
| 133 | /* private fields, do not use outside kernfs proper */ |
| 134 | struct ida ino_ida; |
Tejun Heo | 80b9bbe | 2013-12-11 16:03:00 -0500 | [diff] [blame] | 135 | struct kernfs_dir_ops *dir_ops; |
Tejun Heo | ba7443b | 2013-11-28 14:54:40 -0500 | [diff] [blame] | 136 | }; |
| 137 | |
Tejun Heo | c525aad | 2013-12-11 14:11:55 -0500 | [diff] [blame] | 138 | struct kernfs_open_file { |
Tejun Heo | dd8a5b0 | 2013-11-28 14:54:20 -0500 | [diff] [blame] | 139 | /* published fields */ |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 140 | struct kernfs_node *kn; |
Tejun Heo | dd8a5b0 | 2013-11-28 14:54:20 -0500 | [diff] [blame] | 141 | struct file *file; |
| 142 | |
| 143 | /* private fields, do not use outside kernfs proper */ |
| 144 | struct mutex mutex; |
| 145 | int event; |
| 146 | struct list_head list; |
| 147 | |
| 148 | bool mmapped; |
| 149 | const struct vm_operations_struct *vm_ops; |
| 150 | }; |
| 151 | |
Tejun Heo | f6acf8b | 2013-11-28 14:54:21 -0500 | [diff] [blame] | 152 | struct kernfs_ops { |
| 153 | /* |
| 154 | * Read is handled by either seq_file or raw_read(). |
| 155 | * |
Tejun Heo | d19b984 | 2013-11-28 14:54:26 -0500 | [diff] [blame] | 156 | * If seq_show() is present, seq_file path is active. Other seq |
| 157 | * operations are optional and if not implemented, the behavior is |
| 158 | * equivalent to single_open(). @sf->private points to the |
Tejun Heo | c525aad | 2013-12-11 14:11:55 -0500 | [diff] [blame] | 159 | * associated kernfs_open_file. |
Tejun Heo | f6acf8b | 2013-11-28 14:54:21 -0500 | [diff] [blame] | 160 | * |
| 161 | * read() is bounced through kernel buffer and a read larger than |
| 162 | * PAGE_SIZE results in partial operation of PAGE_SIZE. |
| 163 | */ |
| 164 | int (*seq_show)(struct seq_file *sf, void *v); |
| 165 | |
Tejun Heo | d19b984 | 2013-11-28 14:54:26 -0500 | [diff] [blame] | 166 | void *(*seq_start)(struct seq_file *sf, loff_t *ppos); |
| 167 | void *(*seq_next)(struct seq_file *sf, void *v, loff_t *ppos); |
| 168 | void (*seq_stop)(struct seq_file *sf, void *v); |
| 169 | |
Tejun Heo | c525aad | 2013-12-11 14:11:55 -0500 | [diff] [blame] | 170 | 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] | 171 | loff_t off); |
| 172 | |
| 173 | /* |
| 174 | * write() is bounced through kernel buffer and a write larger than |
| 175 | * PAGE_SIZE results in partial operation of PAGE_SIZE. |
| 176 | */ |
Tejun Heo | c525aad | 2013-12-11 14:11:55 -0500 | [diff] [blame] | 177 | 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] | 178 | loff_t off); |
| 179 | |
Tejun Heo | c525aad | 2013-12-11 14:11:55 -0500 | [diff] [blame] | 180 | int (*mmap)(struct kernfs_open_file *of, struct vm_area_struct *vma); |
Tejun Heo | 517e64f | 2013-11-28 14:54:29 -0500 | [diff] [blame] | 181 | |
| 182 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 183 | struct lock_class_key lockdep_key; |
| 184 | #endif |
Tejun Heo | f6acf8b | 2013-11-28 14:54:21 -0500 | [diff] [blame] | 185 | }; |
| 186 | |
Tejun Heo | 879f40d | 2013-11-23 17:21:49 -0500 | [diff] [blame] | 187 | #ifdef CONFIG_SYSFS |
| 188 | |
Tejun Heo | df23fc3 | 2013-12-11 14:11:56 -0500 | [diff] [blame] | 189 | static inline enum kernfs_node_type kernfs_type(struct kernfs_node *kn) |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 190 | { |
Tejun Heo | df23fc3 | 2013-12-11 14:11:56 -0500 | [diff] [blame] | 191 | return kn->flags & KERNFS_TYPE_MASK; |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 192 | } |
| 193 | |
| 194 | /** |
| 195 | * kernfs_enable_ns - enable namespace under a directory |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 196 | * @kn: directory of interest, should be empty |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 197 | * |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 198 | * This is to be called right after @kn is created to enable namespace |
| 199 | * 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] | 200 | * only the ones which match the super_block's tag will be visible. |
| 201 | */ |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 202 | static inline void kernfs_enable_ns(struct kernfs_node *kn) |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 203 | { |
Tejun Heo | df23fc3 | 2013-12-11 14:11:56 -0500 | [diff] [blame] | 204 | WARN_ON_ONCE(kernfs_type(kn) != KERNFS_DIR); |
Tejun Heo | adc5e8b | 2013-12-11 14:11:54 -0500 | [diff] [blame] | 205 | WARN_ON_ONCE(!RB_EMPTY_ROOT(&kn->dir.children)); |
Tejun Heo | df23fc3 | 2013-12-11 14:11:56 -0500 | [diff] [blame] | 206 | kn->flags |= KERNFS_NS; |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 207 | } |
| 208 | |
Tejun Heo | ac9bba0 | 2013-11-29 17:19:09 -0500 | [diff] [blame] | 209 | /** |
| 210 | * kernfs_ns_enabled - test whether namespace is enabled |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 211 | * @kn: the node to test |
Tejun Heo | ac9bba0 | 2013-11-29 17:19:09 -0500 | [diff] [blame] | 212 | * |
| 213 | * Test whether namespace filtering is enabled for the children of @ns. |
| 214 | */ |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 215 | static inline bool kernfs_ns_enabled(struct kernfs_node *kn) |
Tejun Heo | ac9bba0 | 2013-11-29 17:19:09 -0500 | [diff] [blame] | 216 | { |
Tejun Heo | df23fc3 | 2013-12-11 14:11:56 -0500 | [diff] [blame] | 217 | return kn->flags & KERNFS_NS; |
Tejun Heo | ac9bba0 | 2013-11-29 17:19:09 -0500 | [diff] [blame] | 218 | } |
| 219 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 220 | struct kernfs_node *kernfs_find_and_get_ns(struct kernfs_node *parent, |
| 221 | const char *name, const void *ns); |
| 222 | void kernfs_get(struct kernfs_node *kn); |
| 223 | void kernfs_put(struct kernfs_node *kn); |
Tejun Heo | ccf73cf | 2013-11-28 14:54:30 -0500 | [diff] [blame] | 224 | |
Tejun Heo | 80b9bbe | 2013-12-11 16:03:00 -0500 | [diff] [blame] | 225 | struct kernfs_root *kernfs_create_root(struct kernfs_dir_ops *kdops, |
| 226 | void *priv); |
Tejun Heo | ba7443b | 2013-11-28 14:54:40 -0500 | [diff] [blame] | 227 | void kernfs_destroy_root(struct kernfs_root *root); |
| 228 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 229 | struct kernfs_node *kernfs_create_dir_ns(struct kernfs_node *parent, |
Tejun Heo | bb8b9d0 | 2013-12-11 16:02:55 -0500 | [diff] [blame] | 230 | const char *name, umode_t mode, |
| 231 | void *priv, const void *ns); |
Tejun Heo | 2063d60 | 2013-12-11 16:02:57 -0500 | [diff] [blame] | 232 | struct kernfs_node *__kernfs_create_file(struct kernfs_node *parent, |
| 233 | const char *name, |
| 234 | umode_t mode, loff_t size, |
| 235 | const struct kernfs_ops *ops, |
| 236 | void *priv, const void *ns, |
| 237 | bool name_is_static, |
| 238 | struct lock_class_key *key); |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 239 | struct kernfs_node *kernfs_create_link(struct kernfs_node *parent, |
| 240 | const char *name, |
| 241 | struct kernfs_node *target); |
| 242 | void kernfs_remove(struct kernfs_node *kn); |
| 243 | 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] | 244 | const void *ns); |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 245 | 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] | 246 | const char *new_name, const void *new_ns); |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 247 | int kernfs_setattr(struct kernfs_node *kn, const struct iattr *iattr); |
| 248 | void kernfs_notify(struct kernfs_node *kn); |
Tejun Heo | 879f40d | 2013-11-23 17:21:49 -0500 | [diff] [blame] | 249 | |
Tejun Heo | 4b93dc9 | 2013-11-28 14:54:43 -0500 | [diff] [blame] | 250 | const void *kernfs_super_ns(struct super_block *sb); |
| 251 | struct dentry *kernfs_mount_ns(struct file_system_type *fs_type, int flags, |
Li Zefan | fed95ba | 2014-02-25 19:28:44 +0800 | [diff] [blame^] | 252 | struct kernfs_root *root, bool *new_sb_created, |
| 253 | const void *ns); |
Tejun Heo | 4b93dc9 | 2013-11-28 14:54:43 -0500 | [diff] [blame] | 254 | void kernfs_kill_sb(struct super_block *sb); |
| 255 | |
| 256 | void kernfs_init(void); |
| 257 | |
Tejun Heo | 879f40d | 2013-11-23 17:21:49 -0500 | [diff] [blame] | 258 | #else /* CONFIG_SYSFS */ |
| 259 | |
Tejun Heo | df23fc3 | 2013-12-11 14:11:56 -0500 | [diff] [blame] | 260 | static inline enum kernfs_node_type kernfs_type(struct kernfs_node *kn) |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 261 | { return 0; } /* whatever */ |
| 262 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 263 | static inline void kernfs_enable_ns(struct kernfs_node *kn) { } |
Tejun Heo | cf9e5a7 | 2013-11-29 17:18:32 -0500 | [diff] [blame] | 264 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 265 | static inline bool kernfs_ns_enabled(struct kernfs_node *kn) |
Tejun Heo | ac9bba0 | 2013-11-29 17:19:09 -0500 | [diff] [blame] | 266 | { return false; } |
| 267 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 268 | static inline struct kernfs_node * |
| 269 | kernfs_find_and_get_ns(struct kernfs_node *parent, const char *name, |
Tejun Heo | ccf73cf | 2013-11-28 14:54:30 -0500 | [diff] [blame] | 270 | const void *ns) |
| 271 | { return NULL; } |
| 272 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 273 | static inline void kernfs_get(struct kernfs_node *kn) { } |
| 274 | static inline void kernfs_put(struct kernfs_node *kn) { } |
Tejun Heo | ccf73cf | 2013-11-28 14:54:30 -0500 | [diff] [blame] | 275 | |
Tejun Heo | 80b9bbe | 2013-12-11 16:03:00 -0500 | [diff] [blame] | 276 | static inline struct kernfs_root * |
| 277 | kernfs_create_root(struct kernfs_dir_ops *kdops, void *priv) |
Tejun Heo | ba7443b | 2013-11-28 14:54:40 -0500 | [diff] [blame] | 278 | { return ERR_PTR(-ENOSYS); } |
| 279 | |
| 280 | static inline void kernfs_destroy_root(struct kernfs_root *root) { } |
| 281 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 282 | static inline struct kernfs_node * |
Tejun Heo | bb8b9d0 | 2013-12-11 16:02:55 -0500 | [diff] [blame] | 283 | kernfs_create_dir_ns(struct kernfs_node *parent, const char *name, |
| 284 | umode_t mode, void *priv, const void *ns) |
Tejun Heo | 93b2b8e | 2013-11-28 14:54:15 -0500 | [diff] [blame] | 285 | { return ERR_PTR(-ENOSYS); } |
| 286 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 287 | static inline struct kernfs_node * |
Tejun Heo | 2063d60 | 2013-12-11 16:02:57 -0500 | [diff] [blame] | 288 | __kernfs_create_file(struct kernfs_node *parent, const char *name, |
| 289 | umode_t mode, loff_t size, const struct kernfs_ops *ops, |
| 290 | void *priv, const void *ns, bool name_is_static, |
| 291 | struct lock_class_key *key) |
Tejun Heo | 496f739 | 2013-11-28 14:54:24 -0500 | [diff] [blame] | 292 | { return ERR_PTR(-ENOSYS); } |
| 293 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 294 | static inline struct kernfs_node * |
| 295 | kernfs_create_link(struct kernfs_node *parent, const char *name, |
| 296 | struct kernfs_node *target) |
Tejun Heo | 5d0e26b | 2013-11-23 17:21:50 -0500 | [diff] [blame] | 297 | { return ERR_PTR(-ENOSYS); } |
| 298 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 299 | static inline void kernfs_remove(struct kernfs_node *kn) { } |
Tejun Heo | 879f40d | 2013-11-23 17:21:49 -0500 | [diff] [blame] | 300 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 301 | static inline int kernfs_remove_by_name_ns(struct kernfs_node *kn, |
Tejun Heo | 879f40d | 2013-11-23 17:21:49 -0500 | [diff] [blame] | 302 | const char *name, const void *ns) |
| 303 | { return -ENOSYS; } |
| 304 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 305 | static inline int kernfs_rename_ns(struct kernfs_node *kn, |
| 306 | struct kernfs_node *new_parent, |
Tejun Heo | 890ece1 | 2013-11-23 17:21:51 -0500 | [diff] [blame] | 307 | const char *new_name, const void *new_ns) |
| 308 | { return -ENOSYS; } |
| 309 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 310 | static inline int kernfs_setattr(struct kernfs_node *kn, |
Tejun Heo | 5d60418 | 2013-11-23 17:21:52 -0500 | [diff] [blame] | 311 | const struct iattr *iattr) |
| 312 | { return -ENOSYS; } |
| 313 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 314 | static inline void kernfs_notify(struct kernfs_node *kn) { } |
Tejun Heo | 024f647 | 2013-11-28 14:54:27 -0500 | [diff] [blame] | 315 | |
Tejun Heo | 4b93dc9 | 2013-11-28 14:54:43 -0500 | [diff] [blame] | 316 | static inline const void *kernfs_super_ns(struct super_block *sb) |
| 317 | { return NULL; } |
| 318 | |
| 319 | static inline struct dentry * |
| 320 | kernfs_mount_ns(struct file_system_type *fs_type, int flags, |
Li Zefan | fed95ba | 2014-02-25 19:28:44 +0800 | [diff] [blame^] | 321 | struct kernfs_root *root, bool *new_sb_created, const void *ns) |
Tejun Heo | 4b93dc9 | 2013-11-28 14:54:43 -0500 | [diff] [blame] | 322 | { return ERR_PTR(-ENOSYS); } |
| 323 | |
| 324 | static inline void kernfs_kill_sb(struct super_block *sb) { } |
| 325 | |
| 326 | static inline void kernfs_init(void) { } |
| 327 | |
Tejun Heo | 879f40d | 2013-11-23 17:21:49 -0500 | [diff] [blame] | 328 | #endif /* CONFIG_SYSFS */ |
| 329 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 330 | static inline struct kernfs_node * |
| 331 | kernfs_find_and_get(struct kernfs_node *kn, const char *name) |
Tejun Heo | ccf73cf | 2013-11-28 14:54:30 -0500 | [diff] [blame] | 332 | { |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 333 | return kernfs_find_and_get_ns(kn, name, NULL); |
Tejun Heo | ccf73cf | 2013-11-28 14:54:30 -0500 | [diff] [blame] | 334 | } |
| 335 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 336 | static inline struct kernfs_node * |
Tejun Heo | bb8b9d0 | 2013-12-11 16:02:55 -0500 | [diff] [blame] | 337 | kernfs_create_dir(struct kernfs_node *parent, const char *name, umode_t mode, |
| 338 | void *priv) |
Tejun Heo | 93b2b8e | 2013-11-28 14:54:15 -0500 | [diff] [blame] | 339 | { |
Tejun Heo | bb8b9d0 | 2013-12-11 16:02:55 -0500 | [diff] [blame] | 340 | return kernfs_create_dir_ns(parent, name, mode, priv, NULL); |
Tejun Heo | 93b2b8e | 2013-11-28 14:54:15 -0500 | [diff] [blame] | 341 | } |
| 342 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 343 | static inline struct kernfs_node * |
| 344 | kernfs_create_file_ns(struct kernfs_node *parent, const char *name, |
Tejun Heo | 517e64f | 2013-11-28 14:54:29 -0500 | [diff] [blame] | 345 | umode_t mode, loff_t size, const struct kernfs_ops *ops, |
| 346 | void *priv, const void *ns) |
| 347 | { |
| 348 | struct lock_class_key *key = NULL; |
| 349 | |
| 350 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 351 | key = (struct lock_class_key *)&ops->lockdep_key; |
| 352 | #endif |
Tejun Heo | 2063d60 | 2013-12-11 16:02:57 -0500 | [diff] [blame] | 353 | return __kernfs_create_file(parent, name, mode, size, ops, priv, ns, |
| 354 | false, key); |
Tejun Heo | 517e64f | 2013-11-28 14:54:29 -0500 | [diff] [blame] | 355 | } |
| 356 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 357 | static inline struct kernfs_node * |
| 358 | 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] | 359 | loff_t size, const struct kernfs_ops *ops, void *priv) |
| 360 | { |
| 361 | return kernfs_create_file_ns(parent, name, mode, size, ops, priv, NULL); |
| 362 | } |
| 363 | |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 364 | static inline int kernfs_remove_by_name(struct kernfs_node *parent, |
Tejun Heo | 879f40d | 2013-11-23 17:21:49 -0500 | [diff] [blame] | 365 | const char *name) |
| 366 | { |
| 367 | return kernfs_remove_by_name_ns(parent, name, NULL); |
| 368 | } |
| 369 | |
Tejun Heo | 4b93dc9 | 2013-11-28 14:54:43 -0500 | [diff] [blame] | 370 | static inline struct dentry * |
| 371 | kernfs_mount(struct file_system_type *fs_type, int flags, |
Li Zefan | fed95ba | 2014-02-25 19:28:44 +0800 | [diff] [blame^] | 372 | struct kernfs_root *root, bool *new_sb_created) |
Tejun Heo | 4b93dc9 | 2013-11-28 14:54:43 -0500 | [diff] [blame] | 373 | { |
Li Zefan | fed95ba | 2014-02-25 19:28:44 +0800 | [diff] [blame^] | 374 | return kernfs_mount_ns(fs_type, flags, root, new_sb_created, NULL); |
Tejun Heo | 4b93dc9 | 2013-11-28 14:54:43 -0500 | [diff] [blame] | 375 | } |
| 376 | |
Tejun Heo | b8441ed | 2013-11-24 09:54:58 -0500 | [diff] [blame] | 377 | #endif /* __LINUX_KERNFS_H */ |