1 | /* |
2 | FUSE: Filesystem in Userspace |
3 | Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu> |
4 | |
5 | This program can be distributed under the terms of the GNU GPL. |
6 | See the file COPYING. |
7 | */ |
8 | |
9 | #ifndef _FS_FUSE_I_H |
10 | #define _FS_FUSE_I_H |
11 | |
12 | #ifndef pr_fmt |
13 | # define pr_fmt(fmt) "fuse: " fmt |
14 | #endif |
15 | |
16 | #include <linux/fuse.h> |
17 | #include <linux/fs.h> |
18 | #include <linux/mount.h> |
19 | #include <linux/wait.h> |
20 | #include <linux/list.h> |
21 | #include <linux/spinlock.h> |
22 | #include <linux/mm.h> |
23 | #include <linux/backing-dev.h> |
24 | #include <linux/mutex.h> |
25 | #include <linux/rwsem.h> |
26 | #include <linux/rbtree.h> |
27 | #include <linux/poll.h> |
28 | #include <linux/workqueue.h> |
29 | #include <linux/kref.h> |
30 | #include <linux/xattr.h> |
31 | #include <linux/pid_namespace.h> |
32 | #include <linux/refcount.h> |
33 | #include <linux/user_namespace.h> |
34 | |
35 | /** Default max number of pages that can be used in a single read request */ |
36 | #define FUSE_DEFAULT_MAX_PAGES_PER_REQ 32 |
37 | |
38 | /** Maximum of max_pages received in init_out */ |
39 | #define FUSE_MAX_MAX_PAGES 256 |
40 | |
41 | /** Bias for fi->writectr, meaning new writepages must not be sent */ |
42 | #define FUSE_NOWRITE INT_MIN |
43 | |
44 | /** It could be as large as PATH_MAX, but would that have any uses? */ |
45 | #define FUSE_NAME_MAX 1024 |
46 | |
47 | /** Number of dentries for each connection in the control filesystem */ |
48 | #define FUSE_CTL_NUM_DENTRIES 5 |
49 | |
50 | /** List of active connections */ |
51 | extern struct list_head fuse_conn_list; |
52 | |
53 | /** Global mutex protecting fuse_conn_list and the control filesystem */ |
54 | extern struct mutex fuse_mutex; |
55 | |
56 | /** Module parameters */ |
57 | extern unsigned max_user_bgreq; |
58 | extern unsigned max_user_congthresh; |
59 | |
60 | /* One forget request */ |
61 | struct fuse_forget_link { |
62 | struct fuse_forget_one forget_one; |
63 | struct fuse_forget_link *next; |
64 | }; |
65 | |
66 | /* Submount lookup tracking */ |
67 | struct fuse_submount_lookup { |
68 | /** Refcount */ |
69 | refcount_t count; |
70 | |
71 | /** Unique ID, which identifies the inode between userspace |
72 | * and kernel */ |
73 | u64 nodeid; |
74 | |
75 | /** The request used for sending the FORGET message */ |
76 | struct fuse_forget_link *forget; |
77 | }; |
78 | |
79 | /** Container for data related to mapping to backing file */ |
80 | struct fuse_backing { |
81 | struct file *file; |
82 | struct cred *cred; |
83 | |
84 | /** refcount */ |
85 | refcount_t count; |
86 | struct rcu_head rcu; |
87 | }; |
88 | |
89 | /** FUSE inode */ |
90 | struct fuse_inode { |
91 | /** Inode data */ |
92 | struct inode inode; |
93 | |
94 | /** Unique ID, which identifies the inode between userspace |
95 | * and kernel */ |
96 | u64 nodeid; |
97 | |
98 | /** Number of lookups on this inode */ |
99 | u64 nlookup; |
100 | |
101 | /** The request used for sending the FORGET message */ |
102 | struct fuse_forget_link *forget; |
103 | |
104 | /** Time in jiffies until the file attributes are valid */ |
105 | u64 i_time; |
106 | |
107 | /* Which attributes are invalid */ |
108 | u32 inval_mask; |
109 | |
110 | /** The sticky bit in inode->i_mode may have been removed, so |
111 | preserve the original mode */ |
112 | umode_t orig_i_mode; |
113 | |
114 | /* Cache birthtime */ |
115 | struct timespec64 i_btime; |
116 | |
117 | /** 64 bit inode number */ |
118 | u64 orig_ino; |
119 | |
120 | /** Version of last attribute change */ |
121 | u64 attr_version; |
122 | |
123 | union { |
124 | /* read/write io cache (regular file only) */ |
125 | struct { |
126 | /* Files usable in writepage. Protected by fi->lock */ |
127 | struct list_head write_files; |
128 | |
129 | /* Writepages pending on truncate or fsync */ |
130 | struct list_head queued_writes; |
131 | |
132 | /* Number of sent writes, a negative bias |
133 | * (FUSE_NOWRITE) means more writes are blocked */ |
134 | int writectr; |
135 | |
136 | /** Number of files/maps using page cache */ |
137 | int iocachectr; |
138 | |
139 | /* Waitq for writepage completion */ |
140 | wait_queue_head_t page_waitq; |
141 | |
142 | /* waitq for direct-io completion */ |
143 | wait_queue_head_t direct_io_waitq; |
144 | |
145 | /* List of writepage requestst (pending or sent) */ |
146 | struct rb_root writepages; |
147 | }; |
148 | |
149 | /* readdir cache (directory only) */ |
150 | struct { |
151 | /* true if fully cached */ |
152 | bool cached; |
153 | |
154 | /* size of cache */ |
155 | loff_t size; |
156 | |
157 | /* position at end of cache (position of next entry) */ |
158 | loff_t pos; |
159 | |
160 | /* version of the cache */ |
161 | u64 version; |
162 | |
163 | /* modification time of directory when cache was |
164 | * started */ |
165 | struct timespec64 mtime; |
166 | |
167 | /* iversion of directory when cache was started */ |
168 | u64 iversion; |
169 | |
170 | /* protects above fields */ |
171 | spinlock_t lock; |
172 | } rdc; |
173 | }; |
174 | |
175 | /** Miscellaneous bits describing inode state */ |
176 | unsigned long state; |
177 | |
178 | /** Lock for serializing lookup and readdir for back compatibility*/ |
179 | struct mutex mutex; |
180 | |
181 | /** Lock to protect write related fields */ |
182 | spinlock_t lock; |
183 | |
184 | #ifdef CONFIG_FUSE_DAX |
185 | /* |
186 | * Dax specific inode data |
187 | */ |
188 | struct fuse_inode_dax *dax; |
189 | #endif |
190 | /** Submount specific lookup tracking */ |
191 | struct fuse_submount_lookup *submount_lookup; |
192 | #ifdef CONFIG_FUSE_PASSTHROUGH |
193 | /** Reference to backing file in passthrough mode */ |
194 | struct fuse_backing *fb; |
195 | #endif |
196 | }; |
197 | |
198 | /** FUSE inode state bits */ |
199 | enum { |
200 | /** Advise readdirplus */ |
201 | FUSE_I_ADVISE_RDPLUS, |
202 | /** Initialized with readdirplus */ |
203 | FUSE_I_INIT_RDPLUS, |
204 | /** An operation changing file size is in progress */ |
205 | FUSE_I_SIZE_UNSTABLE, |
206 | /* Bad inode */ |
207 | FUSE_I_BAD, |
208 | /* Has btime */ |
209 | FUSE_I_BTIME, |
210 | /* Wants or already has page cache IO */ |
211 | FUSE_I_CACHE_IO_MODE, |
212 | }; |
213 | |
214 | struct fuse_conn; |
215 | struct fuse_mount; |
216 | union fuse_file_args; |
217 | |
218 | /** FUSE specific file data */ |
219 | struct fuse_file { |
220 | /** Fuse connection for this file */ |
221 | struct fuse_mount *fm; |
222 | |
223 | /* Argument space reserved for open/release */ |
224 | union fuse_file_args *args; |
225 | |
226 | /** Kernel file handle guaranteed to be unique */ |
227 | u64 kh; |
228 | |
229 | /** File handle used by userspace */ |
230 | u64 fh; |
231 | |
232 | /** Node id of this file */ |
233 | u64 nodeid; |
234 | |
235 | /** Refcount */ |
236 | refcount_t count; |
237 | |
238 | /** FOPEN_* flags returned by open */ |
239 | u32 open_flags; |
240 | |
241 | /** Entry on inode's write_files list */ |
242 | struct list_head write_entry; |
243 | |
244 | /* Readdir related */ |
245 | struct { |
246 | /* Dir stream position */ |
247 | loff_t pos; |
248 | |
249 | /* Offset in cache */ |
250 | loff_t cache_off; |
251 | |
252 | /* Version of cache we are reading */ |
253 | u64 version; |
254 | |
255 | } readdir; |
256 | |
257 | /** RB node to be linked on fuse_conn->polled_files */ |
258 | struct rb_node polled_node; |
259 | |
260 | /** Wait queue head for poll */ |
261 | wait_queue_head_t poll_wait; |
262 | |
263 | /** Does file hold a fi->iocachectr refcount? */ |
264 | enum { IOM_NONE, IOM_CACHED, IOM_UNCACHED } iomode; |
265 | |
266 | #ifdef CONFIG_FUSE_PASSTHROUGH |
267 | /** Reference to backing file in passthrough mode */ |
268 | struct file *passthrough; |
269 | const struct cred *cred; |
270 | #endif |
271 | |
272 | /** Has flock been performed on this file? */ |
273 | bool flock:1; |
274 | }; |
275 | |
276 | /** One input argument of a request */ |
277 | struct fuse_in_arg { |
278 | unsigned size; |
279 | const void *value; |
280 | }; |
281 | |
282 | /** One output argument of a request */ |
283 | struct fuse_arg { |
284 | unsigned size; |
285 | void *value; |
286 | }; |
287 | |
288 | /** FUSE page descriptor */ |
289 | struct fuse_page_desc { |
290 | unsigned int length; |
291 | unsigned int offset; |
292 | }; |
293 | |
294 | struct fuse_args { |
295 | uint64_t nodeid; |
296 | uint32_t opcode; |
297 | uint8_t in_numargs; |
298 | uint8_t out_numargs; |
299 | uint8_t ext_idx; |
300 | bool force:1; |
301 | bool noreply:1; |
302 | bool nocreds:1; |
303 | bool in_pages:1; |
304 | bool out_pages:1; |
305 | bool user_pages:1; |
306 | bool out_argvar:1; |
307 | bool page_zeroing:1; |
308 | bool page_replace:1; |
309 | bool may_block:1; |
310 | bool is_ext:1; |
311 | bool is_pinned:1; |
312 | struct fuse_in_arg in_args[3]; |
313 | struct fuse_arg out_args[2]; |
314 | void (*end)(struct fuse_mount *fm, struct fuse_args *args, int error); |
315 | }; |
316 | |
317 | struct fuse_args_pages { |
318 | struct fuse_args args; |
319 | struct page **pages; |
320 | struct fuse_page_desc *descs; |
321 | unsigned int num_pages; |
322 | }; |
323 | |
324 | struct fuse_release_args { |
325 | struct fuse_args args; |
326 | struct fuse_release_in inarg; |
327 | struct inode *inode; |
328 | }; |
329 | |
330 | union fuse_file_args { |
331 | /* Used during open() */ |
332 | struct fuse_open_out open_outarg; |
333 | /* Used during release() */ |
334 | struct fuse_release_args release_args; |
335 | }; |
336 | |
337 | #define FUSE_ARGS(args) struct fuse_args args = {} |
338 | |
339 | /** The request IO state (for asynchronous processing) */ |
340 | struct fuse_io_priv { |
341 | struct kref refcnt; |
342 | int async; |
343 | spinlock_t lock; |
344 | unsigned reqs; |
345 | ssize_t bytes; |
346 | size_t size; |
347 | __u64 offset; |
348 | bool write; |
349 | bool should_dirty; |
350 | int err; |
351 | struct kiocb *iocb; |
352 | struct completion *done; |
353 | bool blocking; |
354 | }; |
355 | |
356 | #define FUSE_IO_PRIV_SYNC(i) \ |
357 | { \ |
358 | .refcnt = KREF_INIT(1), \ |
359 | .async = 0, \ |
360 | .iocb = i, \ |
361 | } |
362 | |
363 | /** |
364 | * Request flags |
365 | * |
366 | * FR_ISREPLY: set if the request has reply |
367 | * FR_FORCE: force sending of the request even if interrupted |
368 | * FR_BACKGROUND: request is sent in the background |
369 | * FR_WAITING: request is counted as "waiting" |
370 | * FR_ABORTED: the request was aborted |
371 | * FR_INTERRUPTED: the request has been interrupted |
372 | * FR_LOCKED: data is being copied to/from the request |
373 | * FR_PENDING: request is not yet in userspace |
374 | * FR_SENT: request is in userspace, waiting for an answer |
375 | * FR_FINISHED: request is finished |
376 | * FR_PRIVATE: request is on private list |
377 | * FR_ASYNC: request is asynchronous |
378 | */ |
379 | enum fuse_req_flag { |
380 | FR_ISREPLY, |
381 | FR_FORCE, |
382 | FR_BACKGROUND, |
383 | FR_WAITING, |
384 | FR_ABORTED, |
385 | FR_INTERRUPTED, |
386 | FR_LOCKED, |
387 | FR_PENDING, |
388 | FR_SENT, |
389 | FR_FINISHED, |
390 | FR_PRIVATE, |
391 | FR_ASYNC, |
392 | }; |
393 | |
394 | /** |
395 | * A request to the client |
396 | * |
397 | * .waitq.lock protects the following fields: |
398 | * - FR_ABORTED |
399 | * - FR_LOCKED (may also be modified under fc->lock, tested under both) |
400 | */ |
401 | struct fuse_req { |
402 | /** This can be on either pending processing or io lists in |
403 | fuse_conn */ |
404 | struct list_head list; |
405 | |
406 | /** Entry on the interrupts list */ |
407 | struct list_head intr_entry; |
408 | |
409 | /* Input/output arguments */ |
410 | struct fuse_args *args; |
411 | |
412 | /** refcount */ |
413 | refcount_t count; |
414 | |
415 | /* Request flags, updated with test/set/clear_bit() */ |
416 | unsigned long flags; |
417 | |
418 | /* The request input header */ |
419 | struct { |
420 | struct fuse_in_header h; |
421 | } in; |
422 | |
423 | /* The request output header */ |
424 | struct { |
425 | struct fuse_out_header h; |
426 | } out; |
427 | |
428 | /** Used to wake up the task waiting for completion of request*/ |
429 | wait_queue_head_t waitq; |
430 | |
431 | #if IS_ENABLED(CONFIG_VIRTIO_FS) |
432 | /** virtio-fs's physically contiguous buffer for in and out args */ |
433 | void *argbuf; |
434 | #endif |
435 | |
436 | /** fuse_mount this request belongs to */ |
437 | struct fuse_mount *fm; |
438 | }; |
439 | |
440 | struct fuse_iqueue; |
441 | |
442 | /** |
443 | * Input queue callbacks |
444 | * |
445 | * Input queue signalling is device-specific. For example, the /dev/fuse file |
446 | * uses fiq->waitq and fasync to wake processes that are waiting on queue |
447 | * readiness. These callbacks allow other device types to respond to input |
448 | * queue activity. |
449 | */ |
450 | struct fuse_iqueue_ops { |
451 | /** |
452 | * Signal that a forget has been queued |
453 | */ |
454 | void (*wake_forget_and_unlock)(struct fuse_iqueue *fiq) |
455 | __releases(fiq->lock); |
456 | |
457 | /** |
458 | * Signal that an INTERRUPT request has been queued |
459 | */ |
460 | void (*wake_interrupt_and_unlock)(struct fuse_iqueue *fiq) |
461 | __releases(fiq->lock); |
462 | |
463 | /** |
464 | * Signal that a request has been queued |
465 | */ |
466 | void (*wake_pending_and_unlock)(struct fuse_iqueue *fiq) |
467 | __releases(fiq->lock); |
468 | |
469 | /** |
470 | * Clean up when fuse_iqueue is destroyed |
471 | */ |
472 | void (*release)(struct fuse_iqueue *fiq); |
473 | }; |
474 | |
475 | /** /dev/fuse input queue operations */ |
476 | extern const struct fuse_iqueue_ops fuse_dev_fiq_ops; |
477 | |
478 | struct fuse_iqueue { |
479 | /** Connection established */ |
480 | unsigned connected; |
481 | |
482 | /** Lock protecting accesses to members of this structure */ |
483 | spinlock_t lock; |
484 | |
485 | /** Readers of the connection are waiting on this */ |
486 | wait_queue_head_t waitq; |
487 | |
488 | /** The next unique request id */ |
489 | u64 reqctr; |
490 | |
491 | /** The list of pending requests */ |
492 | struct list_head pending; |
493 | |
494 | /** Pending interrupts */ |
495 | struct list_head interrupts; |
496 | |
497 | /** Queue of pending forgets */ |
498 | struct fuse_forget_link forget_list_head; |
499 | struct fuse_forget_link *forget_list_tail; |
500 | |
501 | /** Batching of FORGET requests (positive indicates FORGET batch) */ |
502 | int forget_batch; |
503 | |
504 | /** O_ASYNC requests */ |
505 | struct fasync_struct *fasync; |
506 | |
507 | /** Device-specific callbacks */ |
508 | const struct fuse_iqueue_ops *ops; |
509 | |
510 | /** Device-specific state */ |
511 | void *priv; |
512 | }; |
513 | |
514 | #define FUSE_PQ_HASH_BITS 8 |
515 | #define FUSE_PQ_HASH_SIZE (1 << FUSE_PQ_HASH_BITS) |
516 | |
517 | struct fuse_pqueue { |
518 | /** Connection established */ |
519 | unsigned connected; |
520 | |
521 | /** Lock protecting accessess to members of this structure */ |
522 | spinlock_t lock; |
523 | |
524 | /** Hash table of requests being processed */ |
525 | struct list_head *processing; |
526 | |
527 | /** The list of requests under I/O */ |
528 | struct list_head io; |
529 | }; |
530 | |
531 | /** |
532 | * Fuse device instance |
533 | */ |
534 | struct fuse_dev { |
535 | /** Fuse connection for this device */ |
536 | struct fuse_conn *fc; |
537 | |
538 | /** Processing queue */ |
539 | struct fuse_pqueue pq; |
540 | |
541 | /** list entry on fc->devices */ |
542 | struct list_head entry; |
543 | }; |
544 | |
545 | enum fuse_dax_mode { |
546 | FUSE_DAX_INODE_DEFAULT, /* default */ |
547 | FUSE_DAX_ALWAYS, /* "-o dax=always" */ |
548 | FUSE_DAX_NEVER, /* "-o dax=never" */ |
549 | FUSE_DAX_INODE_USER, /* "-o dax=inode" */ |
550 | }; |
551 | |
552 | static inline bool fuse_is_inode_dax_mode(enum fuse_dax_mode mode) |
553 | { |
554 | return mode == FUSE_DAX_INODE_DEFAULT || mode == FUSE_DAX_INODE_USER; |
555 | } |
556 | |
557 | struct fuse_fs_context { |
558 | int fd; |
559 | struct file *file; |
560 | unsigned int rootmode; |
561 | kuid_t user_id; |
562 | kgid_t group_id; |
563 | bool is_bdev:1; |
564 | bool fd_present:1; |
565 | bool rootmode_present:1; |
566 | bool user_id_present:1; |
567 | bool group_id_present:1; |
568 | bool default_permissions:1; |
569 | bool allow_other:1; |
570 | bool destroy:1; |
571 | bool no_control:1; |
572 | bool no_force_umount:1; |
573 | bool legacy_opts_show:1; |
574 | enum fuse_dax_mode dax_mode; |
575 | unsigned int max_read; |
576 | unsigned int blksize; |
577 | const char *subtype; |
578 | |
579 | /* DAX device, may be NULL */ |
580 | struct dax_device *dax_dev; |
581 | |
582 | /* fuse_dev pointer to fill in, should contain NULL on entry */ |
583 | void **fudptr; |
584 | }; |
585 | |
586 | struct fuse_sync_bucket { |
587 | /* count is a possible scalability bottleneck */ |
588 | atomic_t count; |
589 | wait_queue_head_t waitq; |
590 | struct rcu_head rcu; |
591 | }; |
592 | |
593 | /** |
594 | * A Fuse connection. |
595 | * |
596 | * This structure is created, when the root filesystem is mounted, and |
597 | * is destroyed, when the client device is closed and the last |
598 | * fuse_mount is destroyed. |
599 | */ |
600 | struct fuse_conn { |
601 | /** Lock protecting accessess to members of this structure */ |
602 | spinlock_t lock; |
603 | |
604 | /** Refcount */ |
605 | refcount_t count; |
606 | |
607 | /** Number of fuse_dev's */ |
608 | atomic_t dev_count; |
609 | |
610 | struct rcu_head rcu; |
611 | |
612 | /** The user id for this mount */ |
613 | kuid_t user_id; |
614 | |
615 | /** The group id for this mount */ |
616 | kgid_t group_id; |
617 | |
618 | /** The pid namespace for this mount */ |
619 | struct pid_namespace *pid_ns; |
620 | |
621 | /** The user namespace for this mount */ |
622 | struct user_namespace *user_ns; |
623 | |
624 | /** Maximum read size */ |
625 | unsigned max_read; |
626 | |
627 | /** Maximum write size */ |
628 | unsigned max_write; |
629 | |
630 | /** Maximum number of pages that can be used in a single request */ |
631 | unsigned int max_pages; |
632 | |
633 | /** Constrain ->max_pages to this value during feature negotiation */ |
634 | unsigned int max_pages_limit; |
635 | |
636 | /** Input queue */ |
637 | struct fuse_iqueue iq; |
638 | |
639 | /** The next unique kernel file handle */ |
640 | atomic64_t khctr; |
641 | |
642 | /** rbtree of fuse_files waiting for poll events indexed by ph */ |
643 | struct rb_root polled_files; |
644 | |
645 | /** Maximum number of outstanding background requests */ |
646 | unsigned max_background; |
647 | |
648 | /** Number of background requests at which congestion starts */ |
649 | unsigned congestion_threshold; |
650 | |
651 | /** Number of requests currently in the background */ |
652 | unsigned num_background; |
653 | |
654 | /** Number of background requests currently queued for userspace */ |
655 | unsigned active_background; |
656 | |
657 | /** The list of background requests set aside for later queuing */ |
658 | struct list_head bg_queue; |
659 | |
660 | /** Protects: max_background, congestion_threshold, num_background, |
661 | * active_background, bg_queue, blocked */ |
662 | spinlock_t bg_lock; |
663 | |
664 | /** Flag indicating that INIT reply has been received. Allocating |
665 | * any fuse request will be suspended until the flag is set */ |
666 | int initialized; |
667 | |
668 | /** Flag indicating if connection is blocked. This will be |
669 | the case before the INIT reply is received, and if there |
670 | are too many outstading backgrounds requests */ |
671 | int blocked; |
672 | |
673 | /** waitq for blocked connection */ |
674 | wait_queue_head_t blocked_waitq; |
675 | |
676 | /** Connection established, cleared on umount, connection |
677 | abort and device release */ |
678 | unsigned connected; |
679 | |
680 | /** Connection aborted via sysfs */ |
681 | bool aborted; |
682 | |
683 | /** Connection failed (version mismatch). Cannot race with |
684 | setting other bitfields since it is only set once in INIT |
685 | reply, before any other request, and never cleared */ |
686 | unsigned conn_error:1; |
687 | |
688 | /** Connection successful. Only set in INIT */ |
689 | unsigned conn_init:1; |
690 | |
691 | /** Do readahead asynchronously? Only set in INIT */ |
692 | unsigned async_read:1; |
693 | |
694 | /** Return an unique read error after abort. Only set in INIT */ |
695 | unsigned abort_err:1; |
696 | |
697 | /** Do not send separate SETATTR request before open(O_TRUNC) */ |
698 | unsigned atomic_o_trunc:1; |
699 | |
700 | /** Filesystem supports NFS exporting. Only set in INIT */ |
701 | unsigned export_support:1; |
702 | |
703 | /** write-back cache policy (default is write-through) */ |
704 | unsigned writeback_cache:1; |
705 | |
706 | /** allow parallel lookups and readdir (default is serialized) */ |
707 | unsigned parallel_dirops:1; |
708 | |
709 | /** handle fs handles killing suid/sgid/cap on write/chown/trunc */ |
710 | unsigned handle_killpriv:1; |
711 | |
712 | /** cache READLINK responses in page cache */ |
713 | unsigned cache_symlinks:1; |
714 | |
715 | /* show legacy mount options */ |
716 | unsigned int legacy_opts_show:1; |
717 | |
718 | /* |
719 | * fs kills suid/sgid/cap on write/chown/trunc. suid is killed on |
720 | * write/trunc only if caller did not have CAP_FSETID. sgid is killed |
721 | * on write/truncate only if caller did not have CAP_FSETID as well as |
722 | * file has group execute permission. |
723 | */ |
724 | unsigned handle_killpriv_v2:1; |
725 | |
726 | /* |
727 | * The following bitfields are only for optimization purposes |
728 | * and hence races in setting them will not cause malfunction |
729 | */ |
730 | |
731 | /** Is open/release not implemented by fs? */ |
732 | unsigned no_open:1; |
733 | |
734 | /** Is opendir/releasedir not implemented by fs? */ |
735 | unsigned no_opendir:1; |
736 | |
737 | /** Is fsync not implemented by fs? */ |
738 | unsigned no_fsync:1; |
739 | |
740 | /** Is fsyncdir not implemented by fs? */ |
741 | unsigned no_fsyncdir:1; |
742 | |
743 | /** Is flush not implemented by fs? */ |
744 | unsigned no_flush:1; |
745 | |
746 | /** Is setxattr not implemented by fs? */ |
747 | unsigned no_setxattr:1; |
748 | |
749 | /** Does file server support extended setxattr */ |
750 | unsigned setxattr_ext:1; |
751 | |
752 | /** Is getxattr not implemented by fs? */ |
753 | unsigned no_getxattr:1; |
754 | |
755 | /** Is listxattr not implemented by fs? */ |
756 | unsigned no_listxattr:1; |
757 | |
758 | /** Is removexattr not implemented by fs? */ |
759 | unsigned no_removexattr:1; |
760 | |
761 | /** Are posix file locking primitives not implemented by fs? */ |
762 | unsigned no_lock:1; |
763 | |
764 | /** Is access not implemented by fs? */ |
765 | unsigned no_access:1; |
766 | |
767 | /** Is create not implemented by fs? */ |
768 | unsigned no_create:1; |
769 | |
770 | /** Is interrupt not implemented by fs? */ |
771 | unsigned no_interrupt:1; |
772 | |
773 | /** Is bmap not implemented by fs? */ |
774 | unsigned no_bmap:1; |
775 | |
776 | /** Is poll not implemented by fs? */ |
777 | unsigned no_poll:1; |
778 | |
779 | /** Do multi-page cached writes */ |
780 | unsigned big_writes:1; |
781 | |
782 | /** Don't apply umask to creation modes */ |
783 | unsigned dont_mask:1; |
784 | |
785 | /** Are BSD file locking primitives not implemented by fs? */ |
786 | unsigned no_flock:1; |
787 | |
788 | /** Is fallocate not implemented by fs? */ |
789 | unsigned no_fallocate:1; |
790 | |
791 | /** Is rename with flags implemented by fs? */ |
792 | unsigned no_rename2:1; |
793 | |
794 | /** Use enhanced/automatic page cache invalidation. */ |
795 | unsigned auto_inval_data:1; |
796 | |
797 | /** Filesystem is fully responsible for page cache invalidation. */ |
798 | unsigned explicit_inval_data:1; |
799 | |
800 | /** Does the filesystem support readdirplus? */ |
801 | unsigned do_readdirplus:1; |
802 | |
803 | /** Does the filesystem want adaptive readdirplus? */ |
804 | unsigned readdirplus_auto:1; |
805 | |
806 | /** Does the filesystem support asynchronous direct-IO submission? */ |
807 | unsigned async_dio:1; |
808 | |
809 | /** Is lseek not implemented by fs? */ |
810 | unsigned no_lseek:1; |
811 | |
812 | /** Does the filesystem support posix acls? */ |
813 | unsigned posix_acl:1; |
814 | |
815 | /** Check permissions based on the file mode or not? */ |
816 | unsigned default_permissions:1; |
817 | |
818 | /** Allow other than the mounter user to access the filesystem ? */ |
819 | unsigned allow_other:1; |
820 | |
821 | /** Does the filesystem support copy_file_range? */ |
822 | unsigned no_copy_file_range:1; |
823 | |
824 | /* Send DESTROY request */ |
825 | unsigned int destroy:1; |
826 | |
827 | /* Delete dentries that have gone stale */ |
828 | unsigned int delete_stale:1; |
829 | |
830 | /** Do not create entry in fusectl fs */ |
831 | unsigned int no_control:1; |
832 | |
833 | /** Do not allow MNT_FORCE umount */ |
834 | unsigned int no_force_umount:1; |
835 | |
836 | /* Auto-mount submounts announced by the server */ |
837 | unsigned int auto_submounts:1; |
838 | |
839 | /* Propagate syncfs() to server */ |
840 | unsigned int sync_fs:1; |
841 | |
842 | /* Initialize security xattrs when creating a new inode */ |
843 | unsigned int init_security:1; |
844 | |
845 | /* Add supplementary group info when creating a new inode */ |
846 | unsigned int create_supp_group:1; |
847 | |
848 | /* Does the filesystem support per inode DAX? */ |
849 | unsigned int inode_dax:1; |
850 | |
851 | /* Is tmpfile not implemented by fs? */ |
852 | unsigned int no_tmpfile:1; |
853 | |
854 | /* Relax restrictions to allow shared mmap in FOPEN_DIRECT_IO mode */ |
855 | unsigned int direct_io_allow_mmap:1; |
856 | |
857 | /* Is statx not implemented by fs? */ |
858 | unsigned int no_statx:1; |
859 | |
860 | /** Passthrough support for read/write IO */ |
861 | unsigned int passthrough:1; |
862 | |
863 | /** Maximum stack depth for passthrough backing files */ |
864 | int max_stack_depth; |
865 | |
866 | /** The number of requests waiting for completion */ |
867 | atomic_t num_waiting; |
868 | |
869 | /** Negotiated minor version */ |
870 | unsigned minor; |
871 | |
872 | /** Entry on the fuse_mount_list */ |
873 | struct list_head entry; |
874 | |
875 | /** Device ID from the root super block */ |
876 | dev_t dev; |
877 | |
878 | /** Dentries in the control filesystem */ |
879 | struct dentry *ctl_dentry[FUSE_CTL_NUM_DENTRIES]; |
880 | |
881 | /** number of dentries used in the above array */ |
882 | int ctl_ndents; |
883 | |
884 | /** Key for lock owner ID scrambling */ |
885 | u32 scramble_key[4]; |
886 | |
887 | /** Version counter for attribute changes */ |
888 | atomic64_t attr_version; |
889 | |
890 | /** Called on final put */ |
891 | void (*release)(struct fuse_conn *); |
892 | |
893 | /** |
894 | * Read/write semaphore to hold when accessing the sb of any |
895 | * fuse_mount belonging to this connection |
896 | */ |
897 | struct rw_semaphore killsb; |
898 | |
899 | /** List of device instances belonging to this connection */ |
900 | struct list_head devices; |
901 | |
902 | #ifdef CONFIG_FUSE_DAX |
903 | /* Dax mode */ |
904 | enum fuse_dax_mode dax_mode; |
905 | |
906 | /* Dax specific conn data, non-NULL if DAX is enabled */ |
907 | struct fuse_conn_dax *dax; |
908 | #endif |
909 | |
910 | /** List of filesystems using this connection */ |
911 | struct list_head mounts; |
912 | |
913 | /* New writepages go into this bucket */ |
914 | struct fuse_sync_bucket __rcu *curr_bucket; |
915 | |
916 | #ifdef CONFIG_FUSE_PASSTHROUGH |
917 | /** IDR for backing files ids */ |
918 | struct idr backing_files_map; |
919 | #endif |
920 | }; |
921 | |
922 | /* |
923 | * Represents a mounted filesystem, potentially a submount. |
924 | * |
925 | * This object allows sharing a fuse_conn between separate mounts to |
926 | * allow submounts with dedicated superblocks and thus separate device |
927 | * IDs. |
928 | */ |
929 | struct fuse_mount { |
930 | /* Underlying (potentially shared) connection to the FUSE server */ |
931 | struct fuse_conn *fc; |
932 | |
933 | /* |
934 | * Super block for this connection (fc->killsb must be held when |
935 | * accessing this). |
936 | */ |
937 | struct super_block *sb; |
938 | |
939 | /* Entry on fc->mounts */ |
940 | struct list_head fc_entry; |
941 | struct rcu_head rcu; |
942 | }; |
943 | |
944 | static inline struct fuse_mount *get_fuse_mount_super(struct super_block *sb) |
945 | { |
946 | return sb->s_fs_info; |
947 | } |
948 | |
949 | static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb) |
950 | { |
951 | return get_fuse_mount_super(sb)->fc; |
952 | } |
953 | |
954 | static inline struct fuse_mount *get_fuse_mount(struct inode *inode) |
955 | { |
956 | return get_fuse_mount_super(sb: inode->i_sb); |
957 | } |
958 | |
959 | static inline struct fuse_conn *get_fuse_conn(struct inode *inode) |
960 | { |
961 | return get_fuse_mount_super(sb: inode->i_sb)->fc; |
962 | } |
963 | |
964 | static inline struct fuse_inode *get_fuse_inode(struct inode *inode) |
965 | { |
966 | return container_of(inode, struct fuse_inode, inode); |
967 | } |
968 | |
969 | static inline u64 get_node_id(struct inode *inode) |
970 | { |
971 | return get_fuse_inode(inode)->nodeid; |
972 | } |
973 | |
974 | static inline int invalid_nodeid(u64 nodeid) |
975 | { |
976 | return !nodeid || nodeid == FUSE_ROOT_ID; |
977 | } |
978 | |
979 | static inline u64 fuse_get_attr_version(struct fuse_conn *fc) |
980 | { |
981 | return atomic64_read(v: &fc->attr_version); |
982 | } |
983 | |
984 | static inline bool fuse_stale_inode(const struct inode *inode, int generation, |
985 | struct fuse_attr *attr) |
986 | { |
987 | return inode->i_generation != generation || |
988 | inode_wrong_type(inode, mode: attr->mode); |
989 | } |
990 | |
991 | static inline void fuse_make_bad(struct inode *inode) |
992 | { |
993 | set_bit(nr: FUSE_I_BAD, addr: &get_fuse_inode(inode)->state); |
994 | } |
995 | |
996 | static inline bool fuse_is_bad(struct inode *inode) |
997 | { |
998 | return unlikely(test_bit(FUSE_I_BAD, &get_fuse_inode(inode)->state)); |
999 | } |
1000 | |
1001 | static inline struct page **fuse_pages_alloc(unsigned int npages, gfp_t flags, |
1002 | struct fuse_page_desc **desc) |
1003 | { |
1004 | struct page **pages; |
1005 | |
1006 | pages = kzalloc(size: npages * (sizeof(struct page *) + |
1007 | sizeof(struct fuse_page_desc)), flags); |
1008 | *desc = (void *) (pages + npages); |
1009 | |
1010 | return pages; |
1011 | } |
1012 | |
1013 | static inline void fuse_page_descs_length_init(struct fuse_page_desc *descs, |
1014 | unsigned int index, |
1015 | unsigned int nr_pages) |
1016 | { |
1017 | int i; |
1018 | |
1019 | for (i = index; i < index + nr_pages; i++) |
1020 | descs[i].length = PAGE_SIZE - descs[i].offset; |
1021 | } |
1022 | |
1023 | static inline void fuse_sync_bucket_dec(struct fuse_sync_bucket *bucket) |
1024 | { |
1025 | /* Need RCU protection to prevent use after free after the decrement */ |
1026 | rcu_read_lock(); |
1027 | if (atomic_dec_and_test(v: &bucket->count)) |
1028 | wake_up(&bucket->waitq); |
1029 | rcu_read_unlock(); |
1030 | } |
1031 | |
1032 | /** Device operations */ |
1033 | extern const struct file_operations fuse_dev_operations; |
1034 | |
1035 | extern const struct dentry_operations fuse_dentry_operations; |
1036 | extern const struct dentry_operations fuse_root_dentry_operations; |
1037 | |
1038 | /** |
1039 | * Get a filled in inode |
1040 | */ |
1041 | struct inode *fuse_iget(struct super_block *sb, u64 nodeid, |
1042 | int generation, struct fuse_attr *attr, |
1043 | u64 attr_valid, u64 attr_version); |
1044 | |
1045 | int fuse_lookup_name(struct super_block *sb, u64 nodeid, const struct qstr *name, |
1046 | struct fuse_entry_out *outarg, struct inode **inode); |
1047 | |
1048 | /** |
1049 | * Send FORGET command |
1050 | */ |
1051 | void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget, |
1052 | u64 nodeid, u64 nlookup); |
1053 | |
1054 | struct fuse_forget_link *fuse_alloc_forget(void); |
1055 | |
1056 | struct fuse_forget_link *fuse_dequeue_forget(struct fuse_iqueue *fiq, |
1057 | unsigned int max, |
1058 | unsigned int *countp); |
1059 | |
1060 | /* |
1061 | * Initialize READ or READDIR request |
1062 | */ |
1063 | struct fuse_io_args { |
1064 | union { |
1065 | struct { |
1066 | struct fuse_read_in in; |
1067 | u64 attr_ver; |
1068 | } read; |
1069 | struct { |
1070 | struct fuse_write_in in; |
1071 | struct fuse_write_out out; |
1072 | bool page_locked; |
1073 | } write; |
1074 | }; |
1075 | struct fuse_args_pages ap; |
1076 | struct fuse_io_priv *io; |
1077 | struct fuse_file *ff; |
1078 | }; |
1079 | |
1080 | void fuse_read_args_fill(struct fuse_io_args *ia, struct file *file, loff_t pos, |
1081 | size_t count, int opcode); |
1082 | |
1083 | |
1084 | struct fuse_file *fuse_file_alloc(struct fuse_mount *fm, bool release); |
1085 | void fuse_file_free(struct fuse_file *ff); |
1086 | int fuse_finish_open(struct inode *inode, struct file *file); |
1087 | |
1088 | void fuse_sync_release(struct fuse_inode *fi, struct fuse_file *ff, |
1089 | unsigned int flags); |
1090 | |
1091 | /** |
1092 | * Send RELEASE or RELEASEDIR request |
1093 | */ |
1094 | void fuse_release_common(struct file *file, bool isdir); |
1095 | |
1096 | /** |
1097 | * Send FSYNC or FSYNCDIR request |
1098 | */ |
1099 | int fuse_fsync_common(struct file *file, loff_t start, loff_t end, |
1100 | int datasync, int opcode); |
1101 | |
1102 | /** |
1103 | * Notify poll wakeup |
1104 | */ |
1105 | int fuse_notify_poll_wakeup(struct fuse_conn *fc, |
1106 | struct fuse_notify_poll_wakeup_out *outarg); |
1107 | |
1108 | /** |
1109 | * Initialize file operations on a regular file |
1110 | */ |
1111 | void fuse_init_file_inode(struct inode *inode, unsigned int flags); |
1112 | |
1113 | /** |
1114 | * Initialize inode operations on regular files and special files |
1115 | */ |
1116 | void fuse_init_common(struct inode *inode); |
1117 | |
1118 | /** |
1119 | * Initialize inode and file operations on a directory |
1120 | */ |
1121 | void fuse_init_dir(struct inode *inode); |
1122 | |
1123 | /** |
1124 | * Initialize inode operations on a symlink |
1125 | */ |
1126 | void fuse_init_symlink(struct inode *inode); |
1127 | |
1128 | /** |
1129 | * Change attributes of an inode |
1130 | */ |
1131 | void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, |
1132 | struct fuse_statx *sx, |
1133 | u64 attr_valid, u64 attr_version); |
1134 | |
1135 | void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, |
1136 | struct fuse_statx *sx, |
1137 | u64 attr_valid, u32 cache_mask); |
1138 | |
1139 | u32 fuse_get_cache_mask(struct inode *inode); |
1140 | |
1141 | /** |
1142 | * Initialize the client device |
1143 | */ |
1144 | int fuse_dev_init(void); |
1145 | |
1146 | /** |
1147 | * Cleanup the client device |
1148 | */ |
1149 | void fuse_dev_cleanup(void); |
1150 | |
1151 | int fuse_ctl_init(void); |
1152 | void __exit fuse_ctl_cleanup(void); |
1153 | |
1154 | /** |
1155 | * Simple request sending that does request allocation and freeing |
1156 | */ |
1157 | ssize_t fuse_simple_request(struct fuse_mount *fm, struct fuse_args *args); |
1158 | int fuse_simple_background(struct fuse_mount *fm, struct fuse_args *args, |
1159 | gfp_t gfp_flags); |
1160 | |
1161 | /** |
1162 | * End a finished request |
1163 | */ |
1164 | void fuse_request_end(struct fuse_req *req); |
1165 | |
1166 | /* Abort all requests */ |
1167 | void fuse_abort_conn(struct fuse_conn *fc); |
1168 | void fuse_wait_aborted(struct fuse_conn *fc); |
1169 | |
1170 | /** |
1171 | * Invalidate inode attributes |
1172 | */ |
1173 | |
1174 | /* Attributes possibly changed on data modification */ |
1175 | #define FUSE_STATX_MODIFY (STATX_MTIME | STATX_CTIME | STATX_BLOCKS) |
1176 | |
1177 | /* Attributes possibly changed on data and/or size modification */ |
1178 | #define FUSE_STATX_MODSIZE (FUSE_STATX_MODIFY | STATX_SIZE) |
1179 | |
1180 | void fuse_invalidate_attr(struct inode *inode); |
1181 | void fuse_invalidate_attr_mask(struct inode *inode, u32 mask); |
1182 | |
1183 | void fuse_invalidate_entry_cache(struct dentry *entry); |
1184 | |
1185 | void fuse_invalidate_atime(struct inode *inode); |
1186 | |
1187 | u64 fuse_time_to_jiffies(u64 sec, u32 nsec); |
1188 | #define ATTR_TIMEOUT(o) \ |
1189 | fuse_time_to_jiffies((o)->attr_valid, (o)->attr_valid_nsec) |
1190 | |
1191 | void fuse_change_entry_timeout(struct dentry *entry, struct fuse_entry_out *o); |
1192 | |
1193 | /** |
1194 | * Acquire reference to fuse_conn |
1195 | */ |
1196 | struct fuse_conn *fuse_conn_get(struct fuse_conn *fc); |
1197 | |
1198 | /** |
1199 | * Initialize fuse_conn |
1200 | */ |
1201 | void fuse_conn_init(struct fuse_conn *fc, struct fuse_mount *fm, |
1202 | struct user_namespace *user_ns, |
1203 | const struct fuse_iqueue_ops *fiq_ops, void *fiq_priv); |
1204 | |
1205 | /** |
1206 | * Release reference to fuse_conn |
1207 | */ |
1208 | void fuse_conn_put(struct fuse_conn *fc); |
1209 | |
1210 | struct fuse_dev *fuse_dev_alloc_install(struct fuse_conn *fc); |
1211 | struct fuse_dev *fuse_dev_alloc(void); |
1212 | void fuse_dev_install(struct fuse_dev *fud, struct fuse_conn *fc); |
1213 | void fuse_dev_free(struct fuse_dev *fud); |
1214 | void fuse_send_init(struct fuse_mount *fm); |
1215 | |
1216 | /** |
1217 | * Fill in superblock and initialize fuse connection |
1218 | * @sb: partially-initialized superblock to fill in |
1219 | * @ctx: mount context |
1220 | */ |
1221 | int fuse_fill_super_common(struct super_block *sb, struct fuse_fs_context *ctx); |
1222 | |
1223 | /* |
1224 | * Remove the mount from the connection |
1225 | * |
1226 | * Returns whether this was the last mount |
1227 | */ |
1228 | bool fuse_mount_remove(struct fuse_mount *fm); |
1229 | |
1230 | /* |
1231 | * Setup context ops for submounts |
1232 | */ |
1233 | int fuse_init_fs_context_submount(struct fs_context *fsc); |
1234 | |
1235 | /* |
1236 | * Shut down the connection (possibly sending DESTROY request). |
1237 | */ |
1238 | void fuse_conn_destroy(struct fuse_mount *fm); |
1239 | |
1240 | /* Drop the connection and free the fuse mount */ |
1241 | void fuse_mount_destroy(struct fuse_mount *fm); |
1242 | |
1243 | /** |
1244 | * Add connection to control filesystem |
1245 | */ |
1246 | int fuse_ctl_add_conn(struct fuse_conn *fc); |
1247 | |
1248 | /** |
1249 | * Remove connection from control filesystem |
1250 | */ |
1251 | void fuse_ctl_remove_conn(struct fuse_conn *fc); |
1252 | |
1253 | /** |
1254 | * Is file type valid? |
1255 | */ |
1256 | int fuse_valid_type(int m); |
1257 | |
1258 | bool fuse_invalid_attr(struct fuse_attr *attr); |
1259 | |
1260 | /** |
1261 | * Is current process allowed to perform filesystem operation? |
1262 | */ |
1263 | bool fuse_allow_current_process(struct fuse_conn *fc); |
1264 | |
1265 | u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id); |
1266 | |
1267 | void fuse_flush_time_update(struct inode *inode); |
1268 | void fuse_update_ctime(struct inode *inode); |
1269 | |
1270 | int fuse_update_attributes(struct inode *inode, struct file *file, u32 mask); |
1271 | |
1272 | void fuse_flush_writepages(struct inode *inode); |
1273 | |
1274 | void fuse_set_nowrite(struct inode *inode); |
1275 | void fuse_release_nowrite(struct inode *inode); |
1276 | |
1277 | /** |
1278 | * Scan all fuse_mounts belonging to fc to find the first where |
1279 | * ilookup5() returns a result. Return that result and the |
1280 | * respective fuse_mount in *fm (unless fm is NULL). |
1281 | * |
1282 | * The caller must hold fc->killsb. |
1283 | */ |
1284 | struct inode *fuse_ilookup(struct fuse_conn *fc, u64 nodeid, |
1285 | struct fuse_mount **fm); |
1286 | |
1287 | /** |
1288 | * File-system tells the kernel to invalidate cache for the given node id. |
1289 | */ |
1290 | int fuse_reverse_inval_inode(struct fuse_conn *fc, u64 nodeid, |
1291 | loff_t offset, loff_t len); |
1292 | |
1293 | /** |
1294 | * File-system tells the kernel to invalidate parent attributes and |
1295 | * the dentry matching parent/name. |
1296 | * |
1297 | * If the child_nodeid is non-zero and: |
1298 | * - matches the inode number for the dentry matching parent/name, |
1299 | * - is not a mount point |
1300 | * - is a file or oan empty directory |
1301 | * then the dentry is unhashed (d_delete()). |
1302 | */ |
1303 | int fuse_reverse_inval_entry(struct fuse_conn *fc, u64 parent_nodeid, |
1304 | u64 child_nodeid, struct qstr *name, u32 flags); |
1305 | |
1306 | int fuse_do_open(struct fuse_mount *fm, u64 nodeid, struct file *file, |
1307 | bool isdir); |
1308 | |
1309 | /** |
1310 | * fuse_direct_io() flags |
1311 | */ |
1312 | |
1313 | /** If set, it is WRITE; otherwise - READ */ |
1314 | #define FUSE_DIO_WRITE (1 << 0) |
1315 | |
1316 | /** CUSE pass fuse_direct_io() a file which f_mapping->host is not from FUSE */ |
1317 | #define FUSE_DIO_CUSE (1 << 1) |
1318 | |
1319 | ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter, |
1320 | loff_t *ppos, int flags); |
1321 | long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg, |
1322 | unsigned int flags); |
1323 | long fuse_ioctl_common(struct file *file, unsigned int cmd, |
1324 | unsigned long arg, unsigned int flags); |
1325 | __poll_t fuse_file_poll(struct file *file, poll_table *wait); |
1326 | int fuse_dev_release(struct inode *inode, struct file *file); |
1327 | |
1328 | bool fuse_write_update_attr(struct inode *inode, loff_t pos, ssize_t written); |
1329 | |
1330 | int fuse_flush_times(struct inode *inode, struct fuse_file *ff); |
1331 | int fuse_write_inode(struct inode *inode, struct writeback_control *wbc); |
1332 | |
1333 | int fuse_do_setattr(struct dentry *dentry, struct iattr *attr, |
1334 | struct file *file); |
1335 | |
1336 | void fuse_set_initialized(struct fuse_conn *fc); |
1337 | |
1338 | void fuse_unlock_inode(struct inode *inode, bool locked); |
1339 | bool fuse_lock_inode(struct inode *inode); |
1340 | |
1341 | int fuse_setxattr(struct inode *inode, const char *name, const void *value, |
1342 | size_t size, int flags, unsigned int ); |
1343 | ssize_t fuse_getxattr(struct inode *inode, const char *name, void *value, |
1344 | size_t size); |
1345 | ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size); |
1346 | int fuse_removexattr(struct inode *inode, const char *name); |
1347 | extern const struct xattr_handler * const fuse_xattr_handlers[]; |
1348 | |
1349 | struct posix_acl; |
1350 | struct posix_acl *fuse_get_inode_acl(struct inode *inode, int type, bool rcu); |
1351 | struct posix_acl *fuse_get_acl(struct mnt_idmap *idmap, |
1352 | struct dentry *dentry, int type); |
1353 | int fuse_set_acl(struct mnt_idmap *, struct dentry *dentry, |
1354 | struct posix_acl *acl, int type); |
1355 | |
1356 | /* readdir.c */ |
1357 | int fuse_readdir(struct file *file, struct dir_context *ctx); |
1358 | |
1359 | /** |
1360 | * Return the number of bytes in an arguments list |
1361 | */ |
1362 | unsigned int fuse_len_args(unsigned int numargs, struct fuse_arg *args); |
1363 | |
1364 | /** |
1365 | * Get the next unique ID for a request |
1366 | */ |
1367 | u64 fuse_get_unique(struct fuse_iqueue *fiq); |
1368 | void fuse_free_conn(struct fuse_conn *fc); |
1369 | |
1370 | /* dax.c */ |
1371 | |
1372 | #define FUSE_IS_DAX(inode) (IS_ENABLED(CONFIG_FUSE_DAX) && IS_DAX(inode)) |
1373 | |
1374 | ssize_t fuse_dax_read_iter(struct kiocb *iocb, struct iov_iter *to); |
1375 | ssize_t fuse_dax_write_iter(struct kiocb *iocb, struct iov_iter *from); |
1376 | int fuse_dax_mmap(struct file *file, struct vm_area_struct *vma); |
1377 | int fuse_dax_break_layouts(struct inode *inode, u64 dmap_start, u64 dmap_end); |
1378 | int fuse_dax_conn_alloc(struct fuse_conn *fc, enum fuse_dax_mode mode, |
1379 | struct dax_device *dax_dev); |
1380 | void fuse_dax_conn_free(struct fuse_conn *fc); |
1381 | bool fuse_dax_inode_alloc(struct super_block *sb, struct fuse_inode *fi); |
1382 | void fuse_dax_inode_init(struct inode *inode, unsigned int flags); |
1383 | void fuse_dax_inode_cleanup(struct inode *inode); |
1384 | void fuse_dax_dontcache(struct inode *inode, unsigned int flags); |
1385 | bool fuse_dax_check_alignment(struct fuse_conn *fc, unsigned int map_alignment); |
1386 | void fuse_dax_cancel_work(struct fuse_conn *fc); |
1387 | |
1388 | /* ioctl.c */ |
1389 | long fuse_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg); |
1390 | long fuse_file_compat_ioctl(struct file *file, unsigned int cmd, |
1391 | unsigned long arg); |
1392 | int fuse_fileattr_get(struct dentry *dentry, struct fileattr *fa); |
1393 | int fuse_fileattr_set(struct mnt_idmap *idmap, |
1394 | struct dentry *dentry, struct fileattr *fa); |
1395 | |
1396 | /* iomode.c */ |
1397 | int fuse_file_cached_io_open(struct inode *inode, struct fuse_file *ff); |
1398 | int fuse_inode_uncached_io_start(struct fuse_inode *fi, |
1399 | struct fuse_backing *fb); |
1400 | void fuse_inode_uncached_io_end(struct fuse_inode *fi); |
1401 | |
1402 | int fuse_file_io_open(struct file *file, struct inode *inode); |
1403 | void fuse_file_io_release(struct fuse_file *ff, struct inode *inode); |
1404 | |
1405 | /* file.c */ |
1406 | struct fuse_file *fuse_file_open(struct fuse_mount *fm, u64 nodeid, |
1407 | unsigned int open_flags, bool isdir); |
1408 | void fuse_file_release(struct inode *inode, struct fuse_file *ff, |
1409 | unsigned int open_flags, fl_owner_t id, bool isdir); |
1410 | |
1411 | /* passthrough.c */ |
1412 | static inline struct fuse_backing *fuse_inode_backing(struct fuse_inode *fi) |
1413 | { |
1414 | #ifdef CONFIG_FUSE_PASSTHROUGH |
1415 | return READ_ONCE(fi->fb); |
1416 | #else |
1417 | return NULL; |
1418 | #endif |
1419 | } |
1420 | |
1421 | static inline struct fuse_backing *fuse_inode_backing_set(struct fuse_inode *fi, |
1422 | struct fuse_backing *fb) |
1423 | { |
1424 | #ifdef CONFIG_FUSE_PASSTHROUGH |
1425 | return xchg(&fi->fb, fb); |
1426 | #else |
1427 | return NULL; |
1428 | #endif |
1429 | } |
1430 | |
1431 | #ifdef CONFIG_FUSE_PASSTHROUGH |
1432 | struct fuse_backing *fuse_backing_get(struct fuse_backing *fb); |
1433 | void fuse_backing_put(struct fuse_backing *fb); |
1434 | #else |
1435 | |
1436 | static inline struct fuse_backing *fuse_backing_get(struct fuse_backing *fb) |
1437 | { |
1438 | return NULL; |
1439 | } |
1440 | |
1441 | static inline void fuse_backing_put(struct fuse_backing *fb) |
1442 | { |
1443 | } |
1444 | #endif |
1445 | |
1446 | void fuse_backing_files_init(struct fuse_conn *fc); |
1447 | void fuse_backing_files_free(struct fuse_conn *fc); |
1448 | int fuse_backing_open(struct fuse_conn *fc, struct fuse_backing_map *map); |
1449 | int fuse_backing_close(struct fuse_conn *fc, int backing_id); |
1450 | |
1451 | struct fuse_backing *fuse_passthrough_open(struct file *file, |
1452 | struct inode *inode, |
1453 | int backing_id); |
1454 | void fuse_passthrough_release(struct fuse_file *ff, struct fuse_backing *fb); |
1455 | |
1456 | static inline struct file *fuse_file_passthrough(struct fuse_file *ff) |
1457 | { |
1458 | #ifdef CONFIG_FUSE_PASSTHROUGH |
1459 | return ff->passthrough; |
1460 | #else |
1461 | return NULL; |
1462 | #endif |
1463 | } |
1464 | |
1465 | ssize_t fuse_passthrough_read_iter(struct kiocb *iocb, struct iov_iter *iter); |
1466 | ssize_t fuse_passthrough_write_iter(struct kiocb *iocb, struct iov_iter *iter); |
1467 | ssize_t fuse_passthrough_splice_read(struct file *in, loff_t *ppos, |
1468 | struct pipe_inode_info *pipe, |
1469 | size_t len, unsigned int flags); |
1470 | ssize_t fuse_passthrough_splice_write(struct pipe_inode_info *pipe, |
1471 | struct file *out, loff_t *ppos, |
1472 | size_t len, unsigned int flags); |
1473 | ssize_t fuse_passthrough_mmap(struct file *file, struct vm_area_struct *vma); |
1474 | |
1475 | #endif /* _FS_FUSE_I_H */ |
1476 | |