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TOMOYO Linux Cross Reference
Linux/include/linux/kernfs.h

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  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 
 10 #include <linux/kernel.h>
 11 #include <linux/err.h>
 12 #include <linux/list.h>
 13 #include <linux/mutex.h>
 14 #include <linux/idr.h>
 15 #include <linux/lockdep.h>
 16 #include <linux/rbtree.h>
 17 #include <linux/atomic.h>
 18 #include <linux/uidgid.h>
 19 #include <linux/wait.h>
 20 
 21 struct file;
 22 struct dentry;
 23 struct iattr;
 24 struct seq_file;
 25 struct vm_area_struct;
 26 struct super_block;
 27 struct file_system_type;
 28 struct poll_table_struct;
 29 struct fs_context;
 30 
 31 struct kernfs_fs_context;
 32 struct kernfs_open_node;
 33 struct kernfs_iattrs;
 34 
 35 enum kernfs_node_type {
 36         KERNFS_DIR              = 0x0001,
 37         KERNFS_FILE             = 0x0002,
 38         KERNFS_LINK             = 0x0004,
 39 };
 40 
 41 #define KERNFS_TYPE_MASK        0x000f
 42 #define KERNFS_FLAG_MASK        ~KERNFS_TYPE_MASK
 43 
 44 enum kernfs_node_flag {
 45         KERNFS_ACTIVATED        = 0x0010,
 46         KERNFS_NS               = 0x0020,
 47         KERNFS_HAS_SEQ_SHOW     = 0x0040,
 48         KERNFS_HAS_MMAP         = 0x0080,
 49         KERNFS_LOCKDEP          = 0x0100,
 50         KERNFS_SUICIDAL         = 0x0400,
 51         KERNFS_SUICIDED         = 0x0800,
 52         KERNFS_EMPTY_DIR        = 0x1000,
 53         KERNFS_HAS_RELEASE      = 0x2000,
 54 };
 55 
 56 /* @flags for kernfs_create_root() */
 57 enum kernfs_root_flag {
 58         /*
 59          * kernfs_nodes are created in the deactivated state and invisible.
 60          * They require explicit kernfs_activate() to become visible.  This
 61          * can be used to make related nodes become visible atomically
 62          * after all nodes are created successfully.
 63          */
 64         KERNFS_ROOT_CREATE_DEACTIVATED          = 0x0001,
 65 
 66         /*
 67          * For regular flies, if the opener has CAP_DAC_OVERRIDE, open(2)
 68          * succeeds regardless of the RW permissions.  sysfs had an extra
 69          * layer of enforcement where open(2) fails with -EACCES regardless
 70          * of CAP_DAC_OVERRIDE if the permission doesn't have the
 71          * respective read or write access at all (none of S_IRUGO or
 72          * S_IWUGO) or the respective operation isn't implemented.  The
 73          * following flag enables that behavior.
 74          */
 75         KERNFS_ROOT_EXTRA_OPEN_PERM_CHECK       = 0x0002,
 76 
 77         /*
 78          * The filesystem supports exportfs operation, so userspace can use
 79          * fhandle to access nodes of the fs.
 80          */
 81         KERNFS_ROOT_SUPPORT_EXPORTOP            = 0x0004,
 82 };
 83 
 84 /* type-specific structures for kernfs_node union members */
 85 struct kernfs_elem_dir {
 86         unsigned long           subdirs;
 87         /* children rbtree starts here and goes through kn->rb */
 88         struct rb_root          children;
 89 
 90         /*
 91          * The kernfs hierarchy this directory belongs to.  This fits
 92          * better directly in kernfs_node but is here to save space.
 93          */
 94         struct kernfs_root      *root;
 95 };
 96 
 97 struct kernfs_elem_symlink {
 98         struct kernfs_node      *target_kn;
 99 };
100 
101 struct kernfs_elem_attr {
102         const struct kernfs_ops *ops;
103         struct kernfs_open_node *open;
104         loff_t                  size;
105         struct kernfs_node      *notify_next;   /* for kernfs_notify() */
106 };
107 
108 /* represent a kernfs node */
109 union kernfs_node_id {
110         struct {
111                 /*
112                  * blktrace will export this struct as a simplified 'struct
113                  * fid' (which is a big data struction), so userspace can use
114                  * it to find kernfs node. The layout must match the first two
115                  * fields of 'struct fid' exactly.
116                  */
117                 u32             ino;
118                 u32             generation;
119         };
120         u64                     id;
121 };
122 
123 /*
124  * kernfs_node - the building block of kernfs hierarchy.  Each and every
125  * kernfs node is represented by single kernfs_node.  Most fields are
126  * private to kernfs and shouldn't be accessed directly by kernfs users.
127  *
128  * As long as s_count reference is held, the kernfs_node itself is
129  * accessible.  Dereferencing elem or any other outer entity requires
130  * active reference.
131  */
132 struct kernfs_node {
133         atomic_t                count;
134         atomic_t                active;
135 #ifdef CONFIG_DEBUG_LOCK_ALLOC
136         struct lockdep_map      dep_map;
137 #endif
138         /*
139          * Use kernfs_get_parent() and kernfs_name/path() instead of
140          * accessing the following two fields directly.  If the node is
141          * never moved to a different parent, it is safe to access the
142          * parent directly.
143          */
144         struct kernfs_node      *parent;
145         const char              *name;
146 
147         struct rb_node          rb;
148 
149         const void              *ns;    /* namespace tag */
150         unsigned int            hash;   /* ns + name hash */
151         union {
152                 struct kernfs_elem_dir          dir;
153                 struct kernfs_elem_symlink      symlink;
154                 struct kernfs_elem_attr         attr;
155         };
156 
157         void                    *priv;
158 
159         union kernfs_node_id    id;
160         unsigned short          flags;
161         umode_t                 mode;
162         struct kernfs_iattrs    *iattr;
163 };
164 
165 /*
166  * kernfs_syscall_ops may be specified on kernfs_create_root() to support
167  * syscalls.  These optional callbacks are invoked on the matching syscalls
168  * and can perform any kernfs operations which don't necessarily have to be
169  * the exact operation requested.  An active reference is held for each
170  * kernfs_node parameter.
171  */
172 struct kernfs_syscall_ops {
173         int (*show_options)(struct seq_file *sf, struct kernfs_root *root);
174 
175         int (*mkdir)(struct kernfs_node *parent, const char *name,
176                      umode_t mode);
177         int (*rmdir)(struct kernfs_node *kn);
178         int (*rename)(struct kernfs_node *kn, struct kernfs_node *new_parent,
179                       const char *new_name);
180         int (*show_path)(struct seq_file *sf, struct kernfs_node *kn,
181                          struct kernfs_root *root);
182 };
183 
184 struct kernfs_root {
185         /* published fields */
186         struct kernfs_node      *kn;
187         unsigned int            flags;  /* KERNFS_ROOT_* flags */
188 
189         /* private fields, do not use outside kernfs proper */
190         struct idr              ino_idr;
191         u32                     next_generation;
192         struct kernfs_syscall_ops *syscall_ops;
193 
194         /* list of kernfs_super_info of this root, protected by kernfs_mutex */
195         struct list_head        supers;
196 
197         wait_queue_head_t       deactivate_waitq;
198 };
199 
200 struct kernfs_open_file {
201         /* published fields */
202         struct kernfs_node      *kn;
203         struct file             *file;
204         struct seq_file         *seq_file;
205         void                    *priv;
206 
207         /* private fields, do not use outside kernfs proper */
208         struct mutex            mutex;
209         struct mutex            prealloc_mutex;
210         int                     event;
211         struct list_head        list;
212         char                    *prealloc_buf;
213 
214         size_t                  atomic_write_len;
215         bool                    mmapped:1;
216         bool                    released:1;
217         const struct vm_operations_struct *vm_ops;
218 };
219 
220 struct kernfs_ops {
221         /*
222          * Optional open/release methods.  Both are called with
223          * @of->seq_file populated.
224          */
225         int (*open)(struct kernfs_open_file *of);
226         void (*release)(struct kernfs_open_file *of);
227 
228         /*
229          * Read is handled by either seq_file or raw_read().
230          *
231          * If seq_show() is present, seq_file path is active.  Other seq
232          * operations are optional and if not implemented, the behavior is
233          * equivalent to single_open().  @sf->private points to the
234          * associated kernfs_open_file.
235          *
236          * read() is bounced through kernel buffer and a read larger than
237          * PAGE_SIZE results in partial operation of PAGE_SIZE.
238          */
239         int (*seq_show)(struct seq_file *sf, void *v);
240 
241         void *(*seq_start)(struct seq_file *sf, loff_t *ppos);
242         void *(*seq_next)(struct seq_file *sf, void *v, loff_t *ppos);
243         void (*seq_stop)(struct seq_file *sf, void *v);
244 
245         ssize_t (*read)(struct kernfs_open_file *of, char *buf, size_t bytes,
246                         loff_t off);
247 
248         /*
249          * write() is bounced through kernel buffer.  If atomic_write_len
250          * is not set, a write larger than PAGE_SIZE results in partial
251          * operations of PAGE_SIZE chunks.  If atomic_write_len is set,
252          * writes upto the specified size are executed atomically but
253          * larger ones are rejected with -E2BIG.
254          */
255         size_t atomic_write_len;
256         /*
257          * "prealloc" causes a buffer to be allocated at open for
258          * all read/write requests.  As ->seq_show uses seq_read()
259          * which does its own allocation, it is incompatible with
260          * ->prealloc.  Provide ->read and ->write with ->prealloc.
261          */
262         bool prealloc;
263         ssize_t (*write)(struct kernfs_open_file *of, char *buf, size_t bytes,
264                          loff_t off);
265 
266         __poll_t (*poll)(struct kernfs_open_file *of,
267                          struct poll_table_struct *pt);
268 
269         int (*mmap)(struct kernfs_open_file *of, struct vm_area_struct *vma);
270 
271 #ifdef CONFIG_DEBUG_LOCK_ALLOC
272         struct lock_class_key   lockdep_key;
273 #endif
274 };
275 
276 /*
277  * The kernfs superblock creation/mount parameter context.
278  */
279 struct kernfs_fs_context {
280         struct kernfs_root      *root;          /* Root of the hierarchy being mounted */
281         void                    *ns_tag;        /* Namespace tag of the mount (or NULL) */
282         unsigned long           magic;          /* File system specific magic number */
283 
284         /* The following are set/used by kernfs_mount() */
285         bool                    new_sb_created; /* Set to T if we allocated a new sb */
286 };
287 
288 #ifdef CONFIG_KERNFS
289 
290 static inline enum kernfs_node_type kernfs_type(struct kernfs_node *kn)
291 {
292         return kn->flags & KERNFS_TYPE_MASK;
293 }
294 
295 /**
296  * kernfs_enable_ns - enable namespace under a directory
297  * @kn: directory of interest, should be empty
298  *
299  * This is to be called right after @kn is created to enable namespace
300  * under it.  All children of @kn must have non-NULL namespace tags and
301  * only the ones which match the super_block's tag will be visible.
302  */
303 static inline void kernfs_enable_ns(struct kernfs_node *kn)
304 {
305         WARN_ON_ONCE(kernfs_type(kn) != KERNFS_DIR);
306         WARN_ON_ONCE(!RB_EMPTY_ROOT(&kn->dir.children));
307         kn->flags |= KERNFS_NS;
308 }
309 
310 /**
311  * kernfs_ns_enabled - test whether namespace is enabled
312  * @kn: the node to test
313  *
314  * Test whether namespace filtering is enabled for the children of @ns.
315  */
316 static inline bool kernfs_ns_enabled(struct kernfs_node *kn)
317 {
318         return kn->flags & KERNFS_NS;
319 }
320 
321 int kernfs_name(struct kernfs_node *kn, char *buf, size_t buflen);
322 int kernfs_path_from_node(struct kernfs_node *root_kn, struct kernfs_node *kn,
323                           char *buf, size_t buflen);
324 void pr_cont_kernfs_name(struct kernfs_node *kn);
325 void pr_cont_kernfs_path(struct kernfs_node *kn);
326 struct kernfs_node *kernfs_get_parent(struct kernfs_node *kn);
327 struct kernfs_node *kernfs_find_and_get_ns(struct kernfs_node *parent,
328                                            const char *name, const void *ns);
329 struct kernfs_node *kernfs_walk_and_get_ns(struct kernfs_node *parent,
330                                            const char *path, const void *ns);
331 void kernfs_get(struct kernfs_node *kn);
332 void kernfs_put(struct kernfs_node *kn);
333 
334 struct kernfs_node *kernfs_node_from_dentry(struct dentry *dentry);
335 struct kernfs_root *kernfs_root_from_sb(struct super_block *sb);
336 struct inode *kernfs_get_inode(struct super_block *sb, struct kernfs_node *kn);
337 
338 struct dentry *kernfs_node_dentry(struct kernfs_node *kn,
339                                   struct super_block *sb);
340 struct kernfs_root *kernfs_create_root(struct kernfs_syscall_ops *scops,
341                                        unsigned int flags, void *priv);
342 void kernfs_destroy_root(struct kernfs_root *root);
343 
344 struct kernfs_node *kernfs_create_dir_ns(struct kernfs_node *parent,
345                                          const char *name, umode_t mode,
346                                          kuid_t uid, kgid_t gid,
347                                          void *priv, const void *ns);
348 struct kernfs_node *kernfs_create_empty_dir(struct kernfs_node *parent,
349                                             const char *name);
350 struct kernfs_node *__kernfs_create_file(struct kernfs_node *parent,
351                                          const char *name, umode_t mode,
352                                          kuid_t uid, kgid_t gid,
353                                          loff_t size,
354                                          const struct kernfs_ops *ops,
355                                          void *priv, const void *ns,
356                                          struct lock_class_key *key);
357 struct kernfs_node *kernfs_create_link(struct kernfs_node *parent,
358                                        const char *name,
359                                        struct kernfs_node *target);
360 void kernfs_activate(struct kernfs_node *kn);
361 void kernfs_remove(struct kernfs_node *kn);
362 void kernfs_break_active_protection(struct kernfs_node *kn);
363 void kernfs_unbreak_active_protection(struct kernfs_node *kn);
364 bool kernfs_remove_self(struct kernfs_node *kn);
365 int kernfs_remove_by_name_ns(struct kernfs_node *parent, const char *name,
366                              const void *ns);
367 int kernfs_rename_ns(struct kernfs_node *kn, struct kernfs_node *new_parent,
368                      const char *new_name, const void *new_ns);
369 int kernfs_setattr(struct kernfs_node *kn, const struct iattr *iattr);
370 __poll_t kernfs_generic_poll(struct kernfs_open_file *of,
371                              struct poll_table_struct *pt);
372 void kernfs_notify(struct kernfs_node *kn);
373 
374 const void *kernfs_super_ns(struct super_block *sb);
375 int kernfs_get_tree(struct fs_context *fc);
376 void kernfs_free_fs_context(struct fs_context *fc);
377 void kernfs_kill_sb(struct super_block *sb);
378 
379 void kernfs_init(void);
380 
381 struct kernfs_node *kernfs_get_node_by_id(struct kernfs_root *root,
382         const union kernfs_node_id *id);
383 #else   /* CONFIG_KERNFS */
384 
385 static inline enum kernfs_node_type kernfs_type(struct kernfs_node *kn)
386 { return 0; }   /* whatever */
387 
388 static inline void kernfs_enable_ns(struct kernfs_node *kn) { }
389 
390 static inline bool kernfs_ns_enabled(struct kernfs_node *kn)
391 { return false; }
392 
393 static inline int kernfs_name(struct kernfs_node *kn, char *buf, size_t buflen)
394 { return -ENOSYS; }
395 
396 static inline int kernfs_path_from_node(struct kernfs_node *root_kn,
397                                         struct kernfs_node *kn,
398                                         char *buf, size_t buflen)
399 { return -ENOSYS; }
400 
401 static inline void pr_cont_kernfs_name(struct kernfs_node *kn) { }
402 static inline void pr_cont_kernfs_path(struct kernfs_node *kn) { }
403 
404 static inline struct kernfs_node *kernfs_get_parent(struct kernfs_node *kn)
405 { return NULL; }
406 
407 static inline struct kernfs_node *
408 kernfs_find_and_get_ns(struct kernfs_node *parent, const char *name,
409                        const void *ns)
410 { return NULL; }
411 static inline struct kernfs_node *
412 kernfs_walk_and_get_ns(struct kernfs_node *parent, const char *path,
413                        const void *ns)
414 { return NULL; }
415 
416 static inline void kernfs_get(struct kernfs_node *kn) { }
417 static inline void kernfs_put(struct kernfs_node *kn) { }
418 
419 static inline struct kernfs_node *kernfs_node_from_dentry(struct dentry *dentry)
420 { return NULL; }
421 
422 static inline struct kernfs_root *kernfs_root_from_sb(struct super_block *sb)
423 { return NULL; }
424 
425 static inline struct inode *
426 kernfs_get_inode(struct super_block *sb, struct kernfs_node *kn)
427 { return NULL; }
428 
429 static inline struct kernfs_root *
430 kernfs_create_root(struct kernfs_syscall_ops *scops, unsigned int flags,
431                    void *priv)
432 { return ERR_PTR(-ENOSYS); }
433 
434 static inline void kernfs_destroy_root(struct kernfs_root *root) { }
435 
436 static inline struct kernfs_node *
437 kernfs_create_dir_ns(struct kernfs_node *parent, const char *name,
438                      umode_t mode, kuid_t uid, kgid_t gid,
439                      void *priv, const void *ns)
440 { return ERR_PTR(-ENOSYS); }
441 
442 static inline struct kernfs_node *
443 __kernfs_create_file(struct kernfs_node *parent, const char *name,
444                      umode_t mode, kuid_t uid, kgid_t gid,
445                      loff_t size, const struct kernfs_ops *ops,
446                      void *priv, const void *ns, struct lock_class_key *key)
447 { return ERR_PTR(-ENOSYS); }
448 
449 static inline struct kernfs_node *
450 kernfs_create_link(struct kernfs_node *parent, const char *name,
451                    struct kernfs_node *target)
452 { return ERR_PTR(-ENOSYS); }
453 
454 static inline void kernfs_activate(struct kernfs_node *kn) { }
455 
456 static inline void kernfs_remove(struct kernfs_node *kn) { }
457 
458 static inline bool kernfs_remove_self(struct kernfs_node *kn)
459 { return false; }
460 
461 static inline int kernfs_remove_by_name_ns(struct kernfs_node *kn,
462                                            const char *name, const void *ns)
463 { return -ENOSYS; }
464 
465 static inline int kernfs_rename_ns(struct kernfs_node *kn,
466                                    struct kernfs_node *new_parent,
467                                    const char *new_name, const void *new_ns)
468 { return -ENOSYS; }
469 
470 static inline int kernfs_setattr(struct kernfs_node *kn,
471                                  const struct iattr *iattr)
472 { return -ENOSYS; }
473 
474 static inline void kernfs_notify(struct kernfs_node *kn) { }
475 
476 static inline const void *kernfs_super_ns(struct super_block *sb)
477 { return NULL; }
478 
479 static inline int kernfs_get_tree(struct fs_context *fc)
480 { return -ENOSYS; }
481 
482 static inline void kernfs_free_fs_context(struct fs_context *fc) { }
483 
484 static inline void kernfs_kill_sb(struct super_block *sb) { }
485 
486 static inline void kernfs_init(void) { }
487 
488 #endif  /* CONFIG_KERNFS */
489 
490 /**
491  * kernfs_path - build full path of a given node
492  * @kn: kernfs_node of interest
493  * @buf: buffer to copy @kn's name into
494  * @buflen: size of @buf
495  *
496  * If @kn is NULL result will be "(null)".
497  *
498  * Returns the length of the full path.  If the full length is equal to or
499  * greater than @buflen, @buf contains the truncated path with the trailing
500  * '\0'.  On error, -errno is returned.
501  */
502 static inline int kernfs_path(struct kernfs_node *kn, char *buf, size_t buflen)
503 {
504         return kernfs_path_from_node(kn, NULL, buf, buflen);
505 }
506 
507 static inline struct kernfs_node *
508 kernfs_find_and_get(struct kernfs_node *kn, const char *name)
509 {
510         return kernfs_find_and_get_ns(kn, name, NULL);
511 }
512 
513 static inline struct kernfs_node *
514 kernfs_walk_and_get(struct kernfs_node *kn, const char *path)
515 {
516         return kernfs_walk_and_get_ns(kn, path, NULL);
517 }
518 
519 static inline struct kernfs_node *
520 kernfs_create_dir(struct kernfs_node *parent, const char *name, umode_t mode,
521                   void *priv)
522 {
523         return kernfs_create_dir_ns(parent, name, mode,
524                                     GLOBAL_ROOT_UID, GLOBAL_ROOT_GID,
525                                     priv, NULL);
526 }
527 
528 static inline struct kernfs_node *
529 kernfs_create_file_ns(struct kernfs_node *parent, const char *name,
530                       umode_t mode, kuid_t uid, kgid_t gid,
531                       loff_t size, const struct kernfs_ops *ops,
532                       void *priv, const void *ns)
533 {
534         struct lock_class_key *key = NULL;
535 
536 #ifdef CONFIG_DEBUG_LOCK_ALLOC
537         key = (struct lock_class_key *)&ops->lockdep_key;
538 #endif
539         return __kernfs_create_file(parent, name, mode, uid, gid,
540                                     size, ops, priv, ns, key);
541 }
542 
543 static inline struct kernfs_node *
544 kernfs_create_file(struct kernfs_node *parent, const char *name, umode_t mode,
545                    loff_t size, const struct kernfs_ops *ops, void *priv)
546 {
547         return kernfs_create_file_ns(parent, name, mode,
548                                      GLOBAL_ROOT_UID, GLOBAL_ROOT_GID,
549                                      size, ops, priv, NULL);
550 }
551 
552 static inline int kernfs_remove_by_name(struct kernfs_node *parent,
553                                         const char *name)
554 {
555         return kernfs_remove_by_name_ns(parent, name, NULL);
556 }
557 
558 static inline int kernfs_rename(struct kernfs_node *kn,
559                                 struct kernfs_node *new_parent,
560                                 const char *new_name)
561 {
562         return kernfs_rename_ns(kn, new_parent, new_name, NULL);
563 }
564 
565 #endif  /* __LINUX_KERNFS_H */
566 

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