Commit | Line | Data |
---|---|---|
d8a5ba45 MS |
1 | /* |
2 | FUSE: Filesystem in Userspace | |
1729a16c | 3 | Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu> |
d8a5ba45 MS |
4 | |
5 | This program can be distributed under the terms of the GNU GPL. | |
6 | See the file COPYING. | |
7 | */ | |
8 | ||
29d434b3 TH |
9 | #ifndef _FS_FUSE_I_H |
10 | #define _FS_FUSE_I_H | |
11 | ||
d8a5ba45 MS |
12 | #include <linux/fuse.h> |
13 | #include <linux/fs.h> | |
51eb01e7 | 14 | #include <linux/mount.h> |
d8a5ba45 MS |
15 | #include <linux/wait.h> |
16 | #include <linux/list.h> | |
17 | #include <linux/spinlock.h> | |
18 | #include <linux/mm.h> | |
19 | #include <linux/backing-dev.h> | |
bafa9654 | 20 | #include <linux/mutex.h> |
3be5a52b | 21 | #include <linux/rwsem.h> |
95668a69 TH |
22 | #include <linux/rbtree.h> |
23 | #include <linux/poll.h> | |
5a18ec17 | 24 | #include <linux/workqueue.h> |
744742d6 | 25 | #include <linux/kref.h> |
d8a5ba45 | 26 | |
334f485d MS |
27 | /** Max number of pages that can be used in a single read request */ |
28 | #define FUSE_MAX_PAGES_PER_REQ 32 | |
29 | ||
3be5a52b MS |
30 | /** Bias for fi->writectr, meaning new writepages must not be sent */ |
31 | #define FUSE_NOWRITE INT_MIN | |
32 | ||
1d3d752b MS |
33 | /** It could be as large as PATH_MAX, but would that have any uses? */ |
34 | #define FUSE_NAME_MAX 1024 | |
35 | ||
bafa9654 | 36 | /** Number of dentries for each connection in the control filesystem */ |
79a9d994 | 37 | #define FUSE_CTL_NUM_DENTRIES 5 |
bafa9654 | 38 | |
1e9a4ed9 MS |
39 | /** If the FUSE_DEFAULT_PERMISSIONS flag is given, the filesystem |
40 | module will check permissions based on the file mode. Otherwise no | |
41 | permission checking is done in the kernel */ | |
42 | #define FUSE_DEFAULT_PERMISSIONS (1 << 0) | |
43 | ||
44 | /** If the FUSE_ALLOW_OTHER flag is given, then not only the user | |
45 | doing the mount will be allowed to access the filesystem */ | |
46 | #define FUSE_ALLOW_OTHER (1 << 1) | |
47 | ||
4250c066 MP |
48 | /** Number of page pointers embedded in fuse_req */ |
49 | #define FUSE_REQ_INLINE_PAGES 1 | |
50 | ||
bafa9654 MS |
51 | /** List of active connections */ |
52 | extern struct list_head fuse_conn_list; | |
53 | ||
54 | /** Global mutex protecting fuse_conn_list and the control filesystem */ | |
55 | extern struct mutex fuse_mutex; | |
413ef8cb | 56 | |
79a9d994 CH |
57 | /** Module parameters */ |
58 | extern unsigned max_user_bgreq; | |
59 | extern unsigned max_user_congthresh; | |
60 | ||
07e77dca MS |
61 | /* One forget request */ |
62 | struct fuse_forget_link { | |
02c048b9 | 63 | struct fuse_forget_one forget_one; |
07e77dca MS |
64 | struct fuse_forget_link *next; |
65 | }; | |
66 | ||
d8a5ba45 MS |
67 | /** FUSE inode */ |
68 | struct fuse_inode { | |
69 | /** Inode data */ | |
70 | struct inode inode; | |
71 | ||
72 | /** Unique ID, which identifies the inode between userspace | |
73 | * and kernel */ | |
74 | u64 nodeid; | |
75 | ||
9e6268db MS |
76 | /** Number of lookups on this inode */ |
77 | u64 nlookup; | |
78 | ||
e5e5558e | 79 | /** The request used for sending the FORGET message */ |
07e77dca | 80 | struct fuse_forget_link *forget; |
e5e5558e | 81 | |
d8a5ba45 | 82 | /** Time in jiffies until the file attributes are valid */ |
0a0898cf | 83 | u64 i_time; |
ebc14c4d MS |
84 | |
85 | /** The sticky bit in inode->i_mode may have been removed, so | |
86 | preserve the original mode */ | |
541af6a0 | 87 | umode_t orig_i_mode; |
1fb69e78 | 88 | |
45c72cd7 PS |
89 | /** 64 bit inode number */ |
90 | u64 orig_ino; | |
91 | ||
1fb69e78 MS |
92 | /** Version of last attribute change */ |
93 | u64 attr_version; | |
93a8c3cd MS |
94 | |
95 | /** Files usable in writepage. Protected by fc->lock */ | |
96 | struct list_head write_files; | |
3be5a52b MS |
97 | |
98 | /** Writepages pending on truncate or fsync */ | |
99 | struct list_head queued_writes; | |
100 | ||
101 | /** Number of sent writes, a negative bias (FUSE_NOWRITE) | |
102 | * means more writes are blocked */ | |
103 | int writectr; | |
104 | ||
105 | /** Waitq for writepage completion */ | |
106 | wait_queue_head_t page_waitq; | |
107 | ||
108 | /** List of writepage requestst (pending or sent) */ | |
109 | struct list_head writepages; | |
4582a4ab FS |
110 | |
111 | /** Miscellaneous bits describing inode state */ | |
112 | unsigned long state; | |
113 | }; | |
114 | ||
115 | /** FUSE inode state bits */ | |
116 | enum { | |
117 | /** Advise readdirplus */ | |
118 | FUSE_I_ADVISE_RDPLUS, | |
6314efee MS |
119 | /** Initialized with readdirplus */ |
120 | FUSE_I_INIT_RDPLUS, | |
06a7c3c2 MP |
121 | /** An operation changing file size is in progress */ |
122 | FUSE_I_SIZE_UNSTABLE, | |
d8a5ba45 MS |
123 | }; |
124 | ||
da5e4714 MS |
125 | struct fuse_conn; |
126 | ||
b6aeaded MS |
127 | /** FUSE specific file data */ |
128 | struct fuse_file { | |
da5e4714 MS |
129 | /** Fuse connection for this file */ |
130 | struct fuse_conn *fc; | |
131 | ||
b6aeaded | 132 | /** Request reserved for flush and release */ |
33649c91 | 133 | struct fuse_req *reserved_req; |
b6aeaded | 134 | |
acf99433 TH |
135 | /** Kernel file handle guaranteed to be unique */ |
136 | u64 kh; | |
137 | ||
b6aeaded MS |
138 | /** File handle used by userspace */ |
139 | u64 fh; | |
c756e0a4 | 140 | |
da5e4714 MS |
141 | /** Node id of this file */ |
142 | u64 nodeid; | |
143 | ||
c756e0a4 MS |
144 | /** Refcount */ |
145 | atomic_t count; | |
93a8c3cd | 146 | |
c7b7143c MS |
147 | /** FOPEN_* flags returned by open */ |
148 | u32 open_flags; | |
149 | ||
93a8c3cd MS |
150 | /** Entry on inode's write_files list */ |
151 | struct list_head write_entry; | |
95668a69 TH |
152 | |
153 | /** RB node to be linked on fuse_conn->polled_files */ | |
154 | struct rb_node polled_node; | |
155 | ||
156 | /** Wait queue head for poll */ | |
157 | wait_queue_head_t poll_wait; | |
37fb3a30 MS |
158 | |
159 | /** Has flock been performed on this file? */ | |
160 | bool flock:1; | |
b6aeaded MS |
161 | }; |
162 | ||
334f485d MS |
163 | /** One input argument of a request */ |
164 | struct fuse_in_arg { | |
165 | unsigned size; | |
166 | const void *value; | |
167 | }; | |
168 | ||
169 | /** The request input */ | |
170 | struct fuse_in { | |
171 | /** The request header */ | |
172 | struct fuse_in_header h; | |
173 | ||
174 | /** True if the data for the last argument is in req->pages */ | |
175 | unsigned argpages:1; | |
176 | ||
177 | /** Number of arguments */ | |
178 | unsigned numargs; | |
179 | ||
180 | /** Array of arguments */ | |
181 | struct fuse_in_arg args[3]; | |
182 | }; | |
183 | ||
184 | /** One output argument of a request */ | |
185 | struct fuse_arg { | |
186 | unsigned size; | |
187 | void *value; | |
188 | }; | |
189 | ||
190 | /** The request output */ | |
191 | struct fuse_out { | |
192 | /** Header returned from userspace */ | |
193 | struct fuse_out_header h; | |
194 | ||
095da6cb MS |
195 | /* |
196 | * The following bitfields are not changed during the request | |
197 | * processing | |
198 | */ | |
199 | ||
334f485d MS |
200 | /** Last argument is variable length (can be shorter than |
201 | arg->size) */ | |
202 | unsigned argvar:1; | |
203 | ||
204 | /** Last argument is a list of pages to copy data to */ | |
205 | unsigned argpages:1; | |
206 | ||
207 | /** Zero partially or not copied pages */ | |
208 | unsigned page_zeroing:1; | |
209 | ||
ce534fb0 MS |
210 | /** Pages may be replaced with new ones */ |
211 | unsigned page_replace:1; | |
212 | ||
334f485d MS |
213 | /** Number or arguments */ |
214 | unsigned numargs; | |
215 | ||
216 | /** Array of arguments */ | |
f704dcb5 | 217 | struct fuse_arg args[2]; |
334f485d MS |
218 | }; |
219 | ||
b2430d75 MP |
220 | /** FUSE page descriptor */ |
221 | struct fuse_page_desc { | |
222 | unsigned int length; | |
223 | unsigned int offset; | |
224 | }; | |
225 | ||
7078187a MS |
226 | struct fuse_args { |
227 | struct { | |
228 | struct { | |
229 | uint32_t opcode; | |
230 | uint64_t nodeid; | |
231 | } h; | |
232 | unsigned numargs; | |
233 | struct fuse_in_arg args[3]; | |
234 | ||
235 | } in; | |
236 | struct { | |
237 | unsigned argvar:1; | |
238 | unsigned numargs; | |
239 | struct fuse_arg args[2]; | |
240 | } out; | |
241 | }; | |
242 | ||
243 | #define FUSE_ARGS(args) struct fuse_args args = {} | |
244 | ||
01e9d11a MP |
245 | /** The request IO state (for asynchronous processing) */ |
246 | struct fuse_io_priv { | |
744742d6 | 247 | struct kref refcnt; |
01e9d11a MP |
248 | int async; |
249 | spinlock_t lock; | |
250 | unsigned reqs; | |
251 | ssize_t bytes; | |
252 | size_t size; | |
253 | __u64 offset; | |
254 | bool write; | |
255 | int err; | |
256 | struct kiocb *iocb; | |
257 | struct file *file; | |
9d5722b7 | 258 | struct completion *done; |
01e9d11a MP |
259 | }; |
260 | ||
744742d6 SF |
261 | #define FUSE_IO_PRIV_SYNC(f) \ |
262 | { \ | |
263 | .refcnt = { ATOMIC_INIT(1) }, \ | |
264 | .async = 0, \ | |
265 | .file = f, \ | |
266 | } | |
267 | ||
825d6d33 MS |
268 | /** |
269 | * Request flags | |
270 | * | |
271 | * FR_ISREPLY: set if the request has reply | |
272 | * FR_FORCE: force sending of the request even if interrupted | |
273 | * FR_BACKGROUND: request is sent in the background | |
274 | * FR_WAITING: request is counted as "waiting" | |
275 | * FR_ABORTED: the request was aborted | |
276 | * FR_INTERRUPTED: the request has been interrupted | |
277 | * FR_LOCKED: data is being copied to/from the request | |
33e14b4d MS |
278 | * FR_PENDING: request is not yet in userspace |
279 | * FR_SENT: request is in userspace, waiting for an answer | |
280 | * FR_FINISHED: request is finished | |
77cd9d48 | 281 | * FR_PRIVATE: request is on private list |
825d6d33 MS |
282 | */ |
283 | enum fuse_req_flag { | |
284 | FR_ISREPLY, | |
285 | FR_FORCE, | |
286 | FR_BACKGROUND, | |
287 | FR_WAITING, | |
288 | FR_ABORTED, | |
289 | FR_INTERRUPTED, | |
290 | FR_LOCKED, | |
33e14b4d MS |
291 | FR_PENDING, |
292 | FR_SENT, | |
293 | FR_FINISHED, | |
77cd9d48 | 294 | FR_PRIVATE, |
825d6d33 MS |
295 | }; |
296 | ||
334f485d MS |
297 | /** |
298 | * A request to the client | |
dc00809a MS |
299 | * |
300 | * .waitq.lock protects the following fields: | |
301 | * - FR_ABORTED | |
302 | * - FR_LOCKED (may also be modified under fc->lock, tested under both) | |
334f485d MS |
303 | */ |
304 | struct fuse_req { | |
ce1d5a49 MS |
305 | /** This can be on either pending processing or io lists in |
306 | fuse_conn */ | |
334f485d MS |
307 | struct list_head list; |
308 | ||
a4d27e75 MS |
309 | /** Entry on the interrupts list */ |
310 | struct list_head intr_entry; | |
311 | ||
334f485d MS |
312 | /** refcount */ |
313 | atomic_t count; | |
314 | ||
a4d27e75 MS |
315 | /** Unique ID for the interrupt request */ |
316 | u64 intr_unique; | |
317 | ||
825d6d33 MS |
318 | /* Request flags, updated with test/set/clear_bit() */ |
319 | unsigned long flags; | |
9bc5ddda | 320 | |
334f485d MS |
321 | /** The request input */ |
322 | struct fuse_in in; | |
323 | ||
324 | /** The request output */ | |
325 | struct fuse_out out; | |
326 | ||
327 | /** Used to wake up the task waiting for completion of request*/ | |
328 | wait_queue_head_t waitq; | |
329 | ||
330 | /** Data for asynchronous requests */ | |
331 | union { | |
b57d4264 | 332 | struct { |
baebccbe MS |
333 | struct fuse_release_in in; |
334 | struct inode *inode; | |
b57d4264 | 335 | } release; |
3ec870d5 MS |
336 | struct fuse_init_in init_in; |
337 | struct fuse_init_out init_out; | |
08cbf542 | 338 | struct cuse_init_in cuse_init_in; |
5c5c5e51 MS |
339 | struct { |
340 | struct fuse_read_in in; | |
341 | u64 attr_ver; | |
342 | } read; | |
b25e82e5 MS |
343 | struct { |
344 | struct fuse_write_in in; | |
345 | struct fuse_write_out out; | |
8b284dc4 | 346 | struct fuse_req *next; |
b25e82e5 | 347 | } write; |
2d45ba38 | 348 | struct fuse_notify_retrieve_in retrieve_in; |
334f485d MS |
349 | } misc; |
350 | ||
351 | /** page vector */ | |
4250c066 MP |
352 | struct page **pages; |
353 | ||
b2430d75 MP |
354 | /** page-descriptor vector */ |
355 | struct fuse_page_desc *page_descs; | |
356 | ||
4250c066 MP |
357 | /** size of the 'pages' array */ |
358 | unsigned max_pages; | |
359 | ||
360 | /** inline page vector */ | |
361 | struct page *inline_pages[FUSE_REQ_INLINE_PAGES]; | |
334f485d | 362 | |
b2430d75 MP |
363 | /** inline page-descriptor vector */ |
364 | struct fuse_page_desc inline_page_descs[FUSE_REQ_INLINE_PAGES]; | |
365 | ||
334f485d MS |
366 | /** number of pages in vector */ |
367 | unsigned num_pages; | |
368 | ||
334f485d | 369 | /** File used in the request (or NULL) */ |
c756e0a4 | 370 | struct fuse_file *ff; |
64c6d8ed | 371 | |
3be5a52b MS |
372 | /** Inode used in the request or NULL */ |
373 | struct inode *inode; | |
374 | ||
01e9d11a MP |
375 | /** AIO control block */ |
376 | struct fuse_io_priv *io; | |
377 | ||
3be5a52b MS |
378 | /** Link on fi->writepages */ |
379 | struct list_head writepages_entry; | |
380 | ||
64c6d8ed MS |
381 | /** Request completion callback */ |
382 | void (*end)(struct fuse_conn *, struct fuse_req *); | |
33649c91 MS |
383 | |
384 | /** Request is stolen from fuse_file->reserved_req */ | |
385 | struct file *stolen_file; | |
334f485d MS |
386 | }; |
387 | ||
f88996a9 | 388 | struct fuse_iqueue { |
e16714d8 MS |
389 | /** Connection established */ |
390 | unsigned connected; | |
391 | ||
f88996a9 MS |
392 | /** Readers of the connection are waiting on this */ |
393 | wait_queue_head_t waitq; | |
394 | ||
395 | /** The next unique request id */ | |
396 | u64 reqctr; | |
397 | ||
398 | /** The list of pending requests */ | |
399 | struct list_head pending; | |
400 | ||
401 | /** Pending interrupts */ | |
402 | struct list_head interrupts; | |
403 | ||
404 | /** Queue of pending forgets */ | |
405 | struct fuse_forget_link forget_list_head; | |
406 | struct fuse_forget_link *forget_list_tail; | |
407 | ||
408 | /** Batching of FORGET requests (positive indicates FORGET batch) */ | |
409 | int forget_batch; | |
410 | ||
411 | /** O_ASYNC requests */ | |
412 | struct fasync_struct *fasync; | |
413 | }; | |
414 | ||
3a2b5b9c | 415 | struct fuse_pqueue { |
e96edd94 MS |
416 | /** Connection established */ |
417 | unsigned connected; | |
418 | ||
45a91cb1 MS |
419 | /** Lock protecting accessess to members of this structure */ |
420 | spinlock_t lock; | |
421 | ||
3a2b5b9c MS |
422 | /** The list of requests being processed */ |
423 | struct list_head processing; | |
424 | ||
425 | /** The list of requests under I/O */ | |
426 | struct list_head io; | |
427 | }; | |
428 | ||
cc080e9e MS |
429 | /** |
430 | * Fuse device instance | |
431 | */ | |
432 | struct fuse_dev { | |
433 | /** Fuse connection for this device */ | |
434 | struct fuse_conn *fc; | |
435 | ||
c3696046 MS |
436 | /** Processing queue */ |
437 | struct fuse_pqueue pq; | |
438 | ||
cc080e9e MS |
439 | /** list entry on fc->devices */ |
440 | struct list_head entry; | |
441 | }; | |
442 | ||
d8a5ba45 MS |
443 | /** |
444 | * A Fuse connection. | |
445 | * | |
446 | * This structure is created, when the filesystem is mounted, and is | |
447 | * destroyed, when the client device is closed and the filesystem is | |
448 | * unmounted. | |
449 | */ | |
450 | struct fuse_conn { | |
d7133114 MS |
451 | /** Lock protecting accessess to members of this structure */ |
452 | spinlock_t lock; | |
453 | ||
bafa9654 MS |
454 | /** Refcount */ |
455 | atomic_t count; | |
456 | ||
c3696046 MS |
457 | /** Number of fuse_dev's */ |
458 | atomic_t dev_count; | |
459 | ||
dd3e2c55 AV |
460 | struct rcu_head rcu; |
461 | ||
d8a5ba45 | 462 | /** The user id for this mount */ |
499dcf20 | 463 | kuid_t user_id; |
d8a5ba45 | 464 | |
87729a55 | 465 | /** The group id for this mount */ |
499dcf20 | 466 | kgid_t group_id; |
87729a55 | 467 | |
1e9a4ed9 MS |
468 | /** The fuse mount flags for this mount */ |
469 | unsigned flags; | |
470 | ||
db50b96c MS |
471 | /** Maximum read size */ |
472 | unsigned max_read; | |
473 | ||
413ef8cb MS |
474 | /** Maximum write size */ |
475 | unsigned max_write; | |
476 | ||
f88996a9 MS |
477 | /** Input queue */ |
478 | struct fuse_iqueue iq; | |
334f485d | 479 | |
acf99433 TH |
480 | /** The next unique kernel file handle */ |
481 | u64 khctr; | |
482 | ||
95668a69 TH |
483 | /** rbtree of fuse_files waiting for poll events indexed by ph */ |
484 | struct rb_root polled_files; | |
485 | ||
7a6d3c8b CH |
486 | /** Maximum number of outstanding background requests */ |
487 | unsigned max_background; | |
488 | ||
489 | /** Number of background requests at which congestion starts */ | |
490 | unsigned congestion_threshold; | |
491 | ||
08a53cdc MS |
492 | /** Number of requests currently in the background */ |
493 | unsigned num_background; | |
494 | ||
d12def1b MS |
495 | /** Number of background requests currently queued for userspace */ |
496 | unsigned active_background; | |
497 | ||
498 | /** The list of background requests set aside for later queuing */ | |
499 | struct list_head bg_queue; | |
500 | ||
796523fb MP |
501 | /** Flag indicating that INIT reply has been received. Allocating |
502 | * any fuse request will be suspended until the flag is set */ | |
503 | int initialized; | |
504 | ||
08a53cdc MS |
505 | /** Flag indicating if connection is blocked. This will be |
506 | the case before the INIT reply is received, and if there | |
507 | are too many outstading backgrounds requests */ | |
508 | int blocked; | |
509 | ||
510 | /** waitq for blocked connection */ | |
511 | wait_queue_head_t blocked_waitq; | |
de5e3dec MS |
512 | |
513 | /** waitq for reserved requests */ | |
514 | wait_queue_head_t reserved_req_waitq; | |
08a53cdc | 515 | |
69a53bf2 MS |
516 | /** Connection established, cleared on umount, connection |
517 | abort and device release */ | |
095da6cb | 518 | unsigned connected; |
1e9a4ed9 | 519 | |
095da6cb MS |
520 | /** Connection failed (version mismatch). Cannot race with |
521 | setting other bitfields since it is only set once in INIT | |
522 | reply, before any other request, and never cleared */ | |
1729a16c | 523 | unsigned conn_error:1; |
334f485d | 524 | |
0ec7ca41 | 525 | /** Connection successful. Only set in INIT */ |
1729a16c | 526 | unsigned conn_init:1; |
0ec7ca41 | 527 | |
9cd68455 | 528 | /** Do readpages asynchronously? Only set in INIT */ |
1729a16c | 529 | unsigned async_read:1; |
9cd68455 | 530 | |
6ff958ed | 531 | /** Do not send separate SETATTR request before open(O_TRUNC) */ |
1729a16c | 532 | unsigned atomic_o_trunc:1; |
6ff958ed | 533 | |
33670fa2 | 534 | /** Filesystem supports NFS exporting. Only set in INIT */ |
1729a16c | 535 | unsigned export_support:1; |
33670fa2 | 536 | |
a325f9b9 TH |
537 | /** Set if bdi is valid */ |
538 | unsigned bdi_initialized:1; | |
539 | ||
d5cd66c5 PE |
540 | /** write-back cache policy (default is write-through) */ |
541 | unsigned writeback_cache:1; | |
542 | ||
095da6cb MS |
543 | /* |
544 | * The following bitfields are only for optimization purposes | |
545 | * and hence races in setting them will not cause malfunction | |
546 | */ | |
547 | ||
7678ac50 AG |
548 | /** Is open/release not implemented by fs? */ |
549 | unsigned no_open:1; | |
550 | ||
b6aeaded | 551 | /** Is fsync not implemented by fs? */ |
1729a16c | 552 | unsigned no_fsync:1; |
b6aeaded | 553 | |
82547981 | 554 | /** Is fsyncdir not implemented by fs? */ |
1729a16c | 555 | unsigned no_fsyncdir:1; |
82547981 | 556 | |
b6aeaded | 557 | /** Is flush not implemented by fs? */ |
1729a16c | 558 | unsigned no_flush:1; |
b6aeaded | 559 | |
92a8780e | 560 | /** Is setxattr not implemented by fs? */ |
1729a16c | 561 | unsigned no_setxattr:1; |
92a8780e MS |
562 | |
563 | /** Is getxattr not implemented by fs? */ | |
1729a16c | 564 | unsigned no_getxattr:1; |
92a8780e MS |
565 | |
566 | /** Is listxattr not implemented by fs? */ | |
1729a16c | 567 | unsigned no_listxattr:1; |
92a8780e MS |
568 | |
569 | /** Is removexattr not implemented by fs? */ | |
1729a16c | 570 | unsigned no_removexattr:1; |
92a8780e | 571 | |
37fb3a30 | 572 | /** Are posix file locking primitives not implemented by fs? */ |
1729a16c | 573 | unsigned no_lock:1; |
71421259 | 574 | |
31d40d74 | 575 | /** Is access not implemented by fs? */ |
1729a16c | 576 | unsigned no_access:1; |
31d40d74 | 577 | |
fd72faac | 578 | /** Is create not implemented by fs? */ |
1729a16c | 579 | unsigned no_create:1; |
fd72faac | 580 | |
a4d27e75 | 581 | /** Is interrupt not implemented by fs? */ |
1729a16c | 582 | unsigned no_interrupt:1; |
a4d27e75 | 583 | |
b2d2272f | 584 | /** Is bmap not implemented by fs? */ |
1729a16c | 585 | unsigned no_bmap:1; |
b2d2272f | 586 | |
95668a69 TH |
587 | /** Is poll not implemented by fs? */ |
588 | unsigned no_poll:1; | |
589 | ||
78bb6cb9 | 590 | /** Do multi-page cached writes */ |
1729a16c | 591 | unsigned big_writes:1; |
78bb6cb9 | 592 | |
e0a43ddc MS |
593 | /** Don't apply umask to creation modes */ |
594 | unsigned dont_mask:1; | |
595 | ||
37fb3a30 MS |
596 | /** Are BSD file locking primitives not implemented by fs? */ |
597 | unsigned no_flock:1; | |
598 | ||
519c6040 MS |
599 | /** Is fallocate not implemented by fs? */ |
600 | unsigned no_fallocate:1; | |
601 | ||
1560c974 MS |
602 | /** Is rename with flags implemented by fs? */ |
603 | unsigned no_rename2:1; | |
604 | ||
72d0d248 BF |
605 | /** Use enhanced/automatic page cache invalidation. */ |
606 | unsigned auto_inval_data:1; | |
607 | ||
634734b6 | 608 | /** Does the filesystem support readdirplus? */ |
0b05b183 AA |
609 | unsigned do_readdirplus:1; |
610 | ||
634734b6 EW |
611 | /** Does the filesystem want adaptive readdirplus? */ |
612 | unsigned readdirplus_auto:1; | |
613 | ||
60b9df7a MS |
614 | /** Does the filesystem support asynchronous direct-IO submission? */ |
615 | unsigned async_dio:1; | |
616 | ||
0b5da8db R |
617 | /** Is lseek not implemented by fs? */ |
618 | unsigned no_lseek:1; | |
619 | ||
0cd5b885 MS |
620 | /** The number of requests waiting for completion */ |
621 | atomic_t num_waiting; | |
622 | ||
45714d65 MS |
623 | /** Negotiated minor version */ |
624 | unsigned minor; | |
625 | ||
d8a5ba45 MS |
626 | /** Backing dev info */ |
627 | struct backing_dev_info bdi; | |
f543f253 | 628 | |
bafa9654 MS |
629 | /** Entry on the fuse_conn_list */ |
630 | struct list_head entry; | |
631 | ||
b6f2fcbc MS |
632 | /** Device ID from super block */ |
633 | dev_t dev; | |
bafa9654 MS |
634 | |
635 | /** Dentries in the control filesystem */ | |
636 | struct dentry *ctl_dentry[FUSE_CTL_NUM_DENTRIES]; | |
637 | ||
638 | /** number of dentries used in the above array */ | |
639 | int ctl_ndents; | |
385a17bf | 640 | |
9c8ef561 MS |
641 | /** Key for lock owner ID scrambling */ |
642 | u32 scramble_key[4]; | |
0ec7ca41 MS |
643 | |
644 | /** Reserved request for the DESTROY message */ | |
645 | struct fuse_req *destroy_req; | |
1fb69e78 MS |
646 | |
647 | /** Version counter for attribute changes */ | |
648 | u64 attr_version; | |
43901aab TH |
649 | |
650 | /** Called on final put */ | |
651 | void (*release)(struct fuse_conn *); | |
3b463ae0 JM |
652 | |
653 | /** Super block for this connection. */ | |
654 | struct super_block *sb; | |
655 | ||
656 | /** Read/write semaphore to hold when accessing sb. */ | |
657 | struct rw_semaphore killsb; | |
cc080e9e MS |
658 | |
659 | /** List of device instances belonging to this connection */ | |
660 | struct list_head devices; | |
d8a5ba45 MS |
661 | }; |
662 | ||
d8a5ba45 MS |
663 | static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb) |
664 | { | |
6383bdaa | 665 | return sb->s_fs_info; |
d8a5ba45 MS |
666 | } |
667 | ||
668 | static inline struct fuse_conn *get_fuse_conn(struct inode *inode) | |
669 | { | |
670 | return get_fuse_conn_super(inode->i_sb); | |
671 | } | |
672 | ||
673 | static inline struct fuse_inode *get_fuse_inode(struct inode *inode) | |
674 | { | |
675 | return container_of(inode, struct fuse_inode, inode); | |
676 | } | |
677 | ||
678 | static inline u64 get_node_id(struct inode *inode) | |
679 | { | |
680 | return get_fuse_inode(inode)->nodeid; | |
681 | } | |
682 | ||
334f485d | 683 | /** Device operations */ |
4b6f5d20 | 684 | extern const struct file_operations fuse_dev_operations; |
334f485d | 685 | |
4269590a | 686 | extern const struct dentry_operations fuse_dentry_operations; |
dbd561d2 | 687 | |
3b463ae0 JM |
688 | /** |
689 | * Inode to nodeid comparison. | |
690 | */ | |
691 | int fuse_inode_eq(struct inode *inode, void *_nodeidp); | |
692 | ||
e5e5558e MS |
693 | /** |
694 | * Get a filled in inode | |
695 | */ | |
b48badf0 | 696 | struct inode *fuse_iget(struct super_block *sb, u64 nodeid, |
1fb69e78 MS |
697 | int generation, struct fuse_attr *attr, |
698 | u64 attr_valid, u64 attr_version); | |
e5e5558e | 699 | |
33670fa2 MS |
700 | int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name, |
701 | struct fuse_entry_out *outarg, struct inode **inode); | |
702 | ||
e5e5558e MS |
703 | /** |
704 | * Send FORGET command | |
705 | */ | |
07e77dca MS |
706 | void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget, |
707 | u64 nodeid, u64 nlookup); | |
708 | ||
709 | struct fuse_forget_link *fuse_alloc_forget(void); | |
e5e5558e | 710 | |
0b05b183 AA |
711 | /* Used by READDIRPLUS */ |
712 | void fuse_force_forget(struct file *file, u64 nodeid); | |
713 | ||
04730fef | 714 | /** |
361b1eb5 | 715 | * Initialize READ or READDIR request |
04730fef | 716 | */ |
a6643094 | 717 | void fuse_read_fill(struct fuse_req *req, struct file *file, |
2106cb18 | 718 | loff_t pos, size_t count, int opcode); |
04730fef MS |
719 | |
720 | /** | |
721 | * Send OPEN or OPENDIR request | |
722 | */ | |
91fe96b4 | 723 | int fuse_open_common(struct inode *inode, struct file *file, bool isdir); |
04730fef | 724 | |
acf99433 | 725 | struct fuse_file *fuse_file_alloc(struct fuse_conn *fc); |
c7b7143c | 726 | struct fuse_file *fuse_file_get(struct fuse_file *ff); |
fd72faac | 727 | void fuse_file_free(struct fuse_file *ff); |
c7b7143c | 728 | void fuse_finish_open(struct inode *inode, struct file *file); |
fd72faac | 729 | |
8b0797a4 | 730 | void fuse_sync_release(struct fuse_file *ff, int flags); |
c756e0a4 | 731 | |
04730fef MS |
732 | /** |
733 | * Send RELEASE or RELEASEDIR request | |
734 | */ | |
8b0797a4 | 735 | void fuse_release_common(struct file *file, int opcode); |
04730fef | 736 | |
82547981 MS |
737 | /** |
738 | * Send FSYNC or FSYNCDIR request | |
739 | */ | |
02c24a82 JB |
740 | int fuse_fsync_common(struct file *file, loff_t start, loff_t end, |
741 | int datasync, int isdir); | |
82547981 | 742 | |
95668a69 TH |
743 | /** |
744 | * Notify poll wakeup | |
745 | */ | |
746 | int fuse_notify_poll_wakeup(struct fuse_conn *fc, | |
747 | struct fuse_notify_poll_wakeup_out *outarg); | |
748 | ||
b6aeaded | 749 | /** |
1779381d | 750 | * Initialize file operations on a regular file |
b6aeaded MS |
751 | */ |
752 | void fuse_init_file_inode(struct inode *inode); | |
753 | ||
e5e5558e | 754 | /** |
1779381d | 755 | * Initialize inode operations on regular files and special files |
e5e5558e MS |
756 | */ |
757 | void fuse_init_common(struct inode *inode); | |
758 | ||
759 | /** | |
1779381d | 760 | * Initialize inode and file operations on a directory |
e5e5558e MS |
761 | */ |
762 | void fuse_init_dir(struct inode *inode); | |
763 | ||
764 | /** | |
1779381d | 765 | * Initialize inode operations on a symlink |
e5e5558e MS |
766 | */ |
767 | void fuse_init_symlink(struct inode *inode); | |
768 | ||
769 | /** | |
770 | * Change attributes of an inode | |
771 | */ | |
1fb69e78 MS |
772 | void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, |
773 | u64 attr_valid, u64 attr_version); | |
e5e5558e | 774 | |
3be5a52b MS |
775 | void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, |
776 | u64 attr_valid); | |
777 | ||
334f485d MS |
778 | /** |
779 | * Initialize the client device | |
780 | */ | |
781 | int fuse_dev_init(void); | |
782 | ||
783 | /** | |
784 | * Cleanup the client device | |
785 | */ | |
786 | void fuse_dev_cleanup(void); | |
787 | ||
bafa9654 | 788 | int fuse_ctl_init(void); |
7736e8cc | 789 | void __exit fuse_ctl_cleanup(void); |
bafa9654 | 790 | |
334f485d MS |
791 | /** |
792 | * Allocate a request | |
793 | */ | |
4250c066 | 794 | struct fuse_req *fuse_request_alloc(unsigned npages); |
334f485d | 795 | |
4250c066 | 796 | struct fuse_req *fuse_request_alloc_nofs(unsigned npages); |
3be5a52b | 797 | |
334f485d MS |
798 | /** |
799 | * Free a request | |
800 | */ | |
801 | void fuse_request_free(struct fuse_req *req); | |
802 | ||
334f485d | 803 | /** |
b111c8c0 MP |
804 | * Get a request, may fail with -ENOMEM, |
805 | * caller should specify # elements in req->pages[] explicitly | |
334f485d | 806 | */ |
b111c8c0 | 807 | struct fuse_req *fuse_get_req(struct fuse_conn *fc, unsigned npages); |
8b41e671 MP |
808 | struct fuse_req *fuse_get_req_for_background(struct fuse_conn *fc, |
809 | unsigned npages); | |
b111c8c0 | 810 | |
36cf66ed MP |
811 | /* |
812 | * Increment reference count on request | |
813 | */ | |
814 | void __fuse_get_request(struct fuse_req *req); | |
815 | ||
33649c91 MS |
816 | /** |
817 | * Gets a requests for a file operation, always succeeds | |
818 | */ | |
b111c8c0 MP |
819 | struct fuse_req *fuse_get_req_nofail_nopages(struct fuse_conn *fc, |
820 | struct file *file); | |
33649c91 | 821 | |
334f485d | 822 | /** |
ce1d5a49 MS |
823 | * Decrement reference count of a request. If count goes to zero free |
824 | * the request. | |
334f485d MS |
825 | */ |
826 | void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req); | |
827 | ||
828 | /** | |
7c352bdf | 829 | * Send a request (synchronous) |
334f485d | 830 | */ |
b93f858a | 831 | void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req); |
334f485d | 832 | |
7078187a MS |
833 | /** |
834 | * Simple request sending that does request allocation and freeing | |
835 | */ | |
836 | ssize_t fuse_simple_request(struct fuse_conn *fc, struct fuse_args *args); | |
837 | ||
334f485d MS |
838 | /** |
839 | * Send a request in the background | |
840 | */ | |
b93f858a | 841 | void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req); |
334f485d | 842 | |
b93f858a TH |
843 | void fuse_request_send_background_locked(struct fuse_conn *fc, |
844 | struct fuse_req *req); | |
3be5a52b | 845 | |
5a5fb1ea | 846 | /* Abort all requests */ |
69a53bf2 MS |
847 | void fuse_abort_conn(struct fuse_conn *fc); |
848 | ||
e5e5558e MS |
849 | /** |
850 | * Invalidate inode attributes | |
851 | */ | |
852 | void fuse_invalidate_attr(struct inode *inode); | |
bafa9654 | 853 | |
dbd561d2 MS |
854 | void fuse_invalidate_entry_cache(struct dentry *entry); |
855 | ||
451418fc AG |
856 | void fuse_invalidate_atime(struct inode *inode); |
857 | ||
bafa9654 MS |
858 | /** |
859 | * Acquire reference to fuse_conn | |
860 | */ | |
861 | struct fuse_conn *fuse_conn_get(struct fuse_conn *fc); | |
862 | ||
0d179aa5 TH |
863 | /** |
864 | * Initialize fuse_conn | |
865 | */ | |
a325f9b9 | 866 | void fuse_conn_init(struct fuse_conn *fc); |
0d179aa5 | 867 | |
bafa9654 MS |
868 | /** |
869 | * Release reference to fuse_conn | |
870 | */ | |
871 | void fuse_conn_put(struct fuse_conn *fc); | |
872 | ||
cc080e9e MS |
873 | struct fuse_dev *fuse_dev_alloc(struct fuse_conn *fc); |
874 | void fuse_dev_free(struct fuse_dev *fud); | |
875 | ||
bafa9654 MS |
876 | /** |
877 | * Add connection to control filesystem | |
878 | */ | |
879 | int fuse_ctl_add_conn(struct fuse_conn *fc); | |
880 | ||
881 | /** | |
882 | * Remove connection from control filesystem | |
883 | */ | |
884 | void fuse_ctl_remove_conn(struct fuse_conn *fc); | |
a5bfffac TS |
885 | |
886 | /** | |
887 | * Is file type valid? | |
888 | */ | |
889 | int fuse_valid_type(int m); | |
e57ac683 MS |
890 | |
891 | /** | |
c2132c1b | 892 | * Is current process allowed to perform filesystem operation? |
e57ac683 | 893 | */ |
c2132c1b | 894 | int fuse_allow_current_process(struct fuse_conn *fc); |
f3332114 MS |
895 | |
896 | u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id); | |
bcb4be80 MS |
897 | |
898 | int fuse_update_attributes(struct inode *inode, struct kstat *stat, | |
899 | struct file *file, bool *refreshed); | |
3be5a52b MS |
900 | |
901 | void fuse_flush_writepages(struct inode *inode); | |
902 | ||
903 | void fuse_set_nowrite(struct inode *inode); | |
904 | void fuse_release_nowrite(struct inode *inode); | |
5c5c5e51 MS |
905 | |
906 | u64 fuse_get_attr_version(struct fuse_conn *fc); | |
29d434b3 | 907 | |
3b463ae0 JM |
908 | /** |
909 | * File-system tells the kernel to invalidate cache for the given node id. | |
910 | */ | |
911 | int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid, | |
912 | loff_t offset, loff_t len); | |
913 | ||
914 | /** | |
915 | * File-system tells the kernel to invalidate parent attributes and | |
916 | * the dentry matching parent/name. | |
451d0f59 JM |
917 | * |
918 | * If the child_nodeid is non-zero and: | |
919 | * - matches the inode number for the dentry matching parent/name, | |
920 | * - is not a mount point | |
921 | * - is a file or oan empty directory | |
922 | * then the dentry is unhashed (d_delete()). | |
3b463ae0 JM |
923 | */ |
924 | int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid, | |
451d0f59 | 925 | u64 child_nodeid, struct qstr *name); |
3b463ae0 | 926 | |
08cbf542 TH |
927 | int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file, |
928 | bool isdir); | |
ea8cd333 PE |
929 | |
930 | /** | |
931 | * fuse_direct_io() flags | |
932 | */ | |
933 | ||
934 | /** If set, it is WRITE; otherwise - READ */ | |
935 | #define FUSE_DIO_WRITE (1 << 0) | |
936 | ||
937 | /** CUSE pass fuse_direct_io() a file which f_mapping->host is not from FUSE */ | |
938 | #define FUSE_DIO_CUSE (1 << 1) | |
939 | ||
d22a943f AV |
940 | ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter, |
941 | loff_t *ppos, int flags); | |
08cbf542 TH |
942 | long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg, |
943 | unsigned int flags); | |
b18da0c5 MS |
944 | long fuse_ioctl_common(struct file *file, unsigned int cmd, |
945 | unsigned long arg, unsigned int flags); | |
08cbf542 TH |
946 | unsigned fuse_file_poll(struct file *file, poll_table *wait); |
947 | int fuse_dev_release(struct inode *inode, struct file *file); | |
948 | ||
b0aa7606 MP |
949 | bool fuse_write_update_size(struct inode *inode, loff_t pos); |
950 | ||
ab9e13f7 | 951 | int fuse_flush_times(struct inode *inode, struct fuse_file *ff); |
1e18bda8 | 952 | int fuse_write_inode(struct inode *inode, struct writeback_control *wbc); |
a1d75f25 | 953 | |
efb9fa9e MP |
954 | int fuse_do_setattr(struct inode *inode, struct iattr *attr, |
955 | struct file *file); | |
956 | ||
9759bd51 MS |
957 | void fuse_set_initialized(struct fuse_conn *fc); |
958 | ||
29d434b3 | 959 | #endif /* _FS_FUSE_I_H */ |