2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 2007-2009 Google Inc. and Amit Singh
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * * Redistributions in binary form must reproduce the above
14 * copyright notice, this list of conditions and the following disclaimer
15 * in the documentation and/or other materials provided with the
17 * * Neither the name of Google Inc. nor the names of its
18 * contributors may be used to endorse or promote products derived from
19 * this software without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 * Copyright (C) 2005 Csaba Henk.
34 * All rights reserved.
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
45 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
46 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
48 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
49 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
51 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
53 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
54 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 #include <sys/cdefs.h>
59 __FBSDID("$FreeBSD$");
61 #include <sys/param.h>
62 #include <sys/module.h>
63 #include <sys/systm.h>
64 #include <sys/errno.h>
65 #include <sys/kernel.h>
68 #include <sys/malloc.h>
69 #include <sys/queue.h>
72 #include <sys/mutex.h>
74 #include <sys/mount.h>
76 #include <sys/vnode.h>
77 #include <sys/signalvar.h>
78 #include <sys/syscallsubr.h>
79 #include <sys/sysctl.h>
83 #include "fuse_node.h"
85 #include "fuse_internal.h"
87 SDT_PROVIDER_DECLARE(fuse);
90 * arg0: verbosity. Higher numbers give more verbose messages
91 * arg1: Textual message
93 SDT_PROBE_DEFINE2(fuse, , ipc, trace, "int", "char*");
95 static void fdisp_make_pid(struct fuse_dispatcher *fdip, enum fuse_opcode op,
96 struct fuse_data *data, uint64_t nid, pid_t pid, struct ucred *cred);
97 static void fiov_clear(struct fuse_iov *fiov);
98 static void fuse_interrupt_send(struct fuse_ticket *otick, int err);
99 static struct fuse_ticket *fticket_alloc(struct fuse_data *data);
100 static void fticket_refresh(struct fuse_ticket *ftick);
101 static void fticket_destroy(struct fuse_ticket *ftick);
102 static int fticket_wait_answer(struct fuse_ticket *ftick);
104 fticket_aw_pull_uio(struct fuse_ticket *ftick,
107 static int fuse_body_audit(struct fuse_ticket *ftick, size_t blen);
109 static fuse_handler_t fuse_standard_handler;
111 SYSCTL_NODE(_vfs, OID_AUTO, fusefs, CTLFLAG_RW, 0, "FUSE tunables");
112 SYSCTL_STRING(_vfs_fusefs, OID_AUTO, version, CTLFLAG_RD,
113 FUSE_FREEBSD_VERSION, 0, "fuse-freebsd version");
114 static int fuse_ticket_count = 0;
116 SYSCTL_INT(_vfs_fusefs, OID_AUTO, ticket_count, CTLFLAG_RW,
117 &fuse_ticket_count, 0, "number of allocated tickets");
118 static long fuse_iov_permanent_bufsize = 1 << 19;
120 SYSCTL_LONG(_vfs_fusefs, OID_AUTO, iov_permanent_bufsize, CTLFLAG_RW,
121 &fuse_iov_permanent_bufsize, 0,
122 "limit for permanently stored buffer size for fuse_iovs");
123 static int fuse_iov_credit = 16;
125 SYSCTL_INT(_vfs_fusefs, OID_AUTO, iov_credit, CTLFLAG_RW,
127 "how many times is an oversized fuse_iov tolerated");
129 MALLOC_DEFINE(M_FUSEMSG, "fuse_msgbuf", "fuse message buffer");
130 static uma_zone_t ticket_zone;
133 * TODO: figure out how to timeout INTERRUPT requests, because the daemon may
134 * leagally never respond
136 * TODO: remove an INTERRUPT request if the daemon responds to the original
139 fuse_interrupt_callback(struct fuse_ticket *tick, struct uio *uio)
141 struct fuse_ticket *otick, *x_tick;
142 struct fuse_interrupt_in *fii;
143 struct fuse_data *data;
144 data = tick->tk_data;
147 fii = (struct fuse_interrupt_in*)((char*)tick->tk_ms_fiov.base +
148 sizeof(struct fuse_in_header));
150 fuse_lck_mtx_lock(data->aw_mtx);
151 TAILQ_FOREACH_SAFE(otick, &data->aw_head, tk_aw_link, x_tick) {
152 if (otick->tk_unique == fii->unique) {
157 fuse_lck_mtx_unlock(data->aw_mtx);
160 /* Original is already complete. Just return */
164 /* Clear the original ticket's interrupt association */
165 otick->irq_unique = 0;
167 if (tick->tk_aw_ohead.error == EAGAIN) {
169 * There are two reasons we might get this:
170 * 1) the daemon received the INTERRUPT request before the
172 * 2) the daemon received the INTERRUPT request after it
173 * completed the original request.
174 * In the first case we should re-send the INTERRUPT. In the
175 * second, we should ignore it.
178 fuse_interrupt_send(otick, EINTR);
181 /* Illegal FUSE_INTERRUPT response */
186 /* Interrupt the operation otick. Return err as its error code */
188 fuse_interrupt_send(struct fuse_ticket *otick, int err)
190 struct fuse_dispatcher fdi;
191 struct fuse_interrupt_in *fii;
192 struct fuse_in_header *ftick_hdr;
193 struct fuse_data *data = otick->tk_data;
194 struct fuse_ticket *tick, *xtick;
195 struct ucred reused_creds;
197 if (otick->irq_unique == 0) {
199 * If the daemon hasn't yet received otick, then we can answer
200 * it ourselves and return.
202 fuse_lck_mtx_lock(data->ms_mtx);
203 STAILQ_FOREACH_SAFE(tick, &otick->tk_data->ms_head, tk_ms_link,
206 STAILQ_REMOVE(&otick->tk_data->ms_head, tick,
207 fuse_ticket, tk_ms_link);
208 otick->tk_ms_link.stqe_next = NULL;
209 fuse_lck_mtx_unlock(data->ms_mtx);
211 fuse_lck_mtx_lock(otick->tk_aw_mtx);
212 if (!fticket_answered(otick)) {
213 fticket_set_answered(otick);
214 otick->tk_aw_errno = err;
217 fuse_lck_mtx_unlock(otick->tk_aw_mtx);
219 fuse_ticket_drop(tick);
223 fuse_lck_mtx_unlock(data->ms_mtx);
226 * If the fuse daemon has already received otick, then we must
227 * send FUSE_INTERRUPT.
229 ftick_hdr = fticket_in_header(otick);
230 reused_creds.cr_uid = ftick_hdr->uid;
231 reused_creds.cr_rgid = ftick_hdr->gid;
232 fdisp_init(&fdi, sizeof(*fii));
233 fdisp_make_pid(&fdi, FUSE_INTERRUPT, data, ftick_hdr->nodeid,
234 ftick_hdr->pid, &reused_creds);
237 fii->unique = otick->tk_unique;
238 fuse_insert_callback(fdi.tick, fuse_interrupt_callback);
240 otick->irq_unique = fdi.tick->tk_unique;
241 fuse_insert_message(fdi.tick);
244 /* This ticket has already been interrupted */
249 fiov_init(struct fuse_iov *fiov, size_t size)
251 uint32_t msize = FU_AT_LEAST(size);
255 fiov->base = malloc(msize, M_FUSEMSG, M_WAITOK | M_ZERO);
257 fiov->allocated_size = msize;
258 fiov->credit = fuse_iov_credit;
262 fiov_teardown(struct fuse_iov *fiov)
264 MPASS(fiov->base != NULL);
265 free(fiov->base, M_FUSEMSG);
269 fiov_adjust(struct fuse_iov *fiov, size_t size)
271 if (fiov->allocated_size < size ||
272 (fuse_iov_permanent_bufsize >= 0 &&
273 fiov->allocated_size - size > fuse_iov_permanent_bufsize &&
274 --fiov->credit < 0)) {
276 fiov->base = realloc(fiov->base, FU_AT_LEAST(size), M_FUSEMSG,
279 panic("FUSE: realloc failed");
281 fiov->allocated_size = FU_AT_LEAST(size);
282 fiov->credit = fuse_iov_credit;
283 /* Clear data buffer after reallocation */
284 bzero(fiov->base, size);
285 } else if (size > fiov->len) {
286 /* Clear newly extended portion of data buffer */
287 bzero((char*)fiov->base + fiov->len, size - fiov->len);
292 /* Clear the fiov's data buffer */
294 fiov_clear(struct fuse_iov *fiov)
296 bzero(fiov->base, fiov->len);
299 /* Resize the fiov if needed, and clear it's buffer */
301 fiov_refresh(struct fuse_iov *fiov)
303 fiov_adjust(fiov, 0);
307 fticket_ctor(void *mem, int size, void *arg, int flags)
309 struct fuse_ticket *ftick = mem;
310 struct fuse_data *data = arg;
312 FUSE_ASSERT_MS_DONE(ftick);
313 FUSE_ASSERT_AW_DONE(ftick);
315 ftick->tk_data = data;
317 if (ftick->tk_unique != 0)
318 fticket_refresh(ftick);
320 /* May be truncated to 32 bits */
321 ftick->tk_unique = atomic_fetchadd_long(&data->ticketer, 1);
322 if (ftick->tk_unique == 0)
323 ftick->tk_unique = atomic_fetchadd_long(&data->ticketer, 1);
325 ftick->irq_unique = 0;
327 refcount_init(&ftick->tk_refcount, 1);
328 atomic_add_acq_int(&fuse_ticket_count, 1);
334 fticket_dtor(void *mem, int size, void *arg)
337 struct fuse_ticket *ftick = mem;
340 FUSE_ASSERT_MS_DONE(ftick);
341 FUSE_ASSERT_AW_DONE(ftick);
343 atomic_subtract_acq_int(&fuse_ticket_count, 1);
347 fticket_init(void *mem, int size, int flags)
349 struct fuse_ticket *ftick = mem;
351 bzero(ftick, sizeof(struct fuse_ticket));
353 fiov_init(&ftick->tk_ms_fiov, sizeof(struct fuse_in_header));
354 ftick->tk_ms_type = FT_M_FIOV;
356 mtx_init(&ftick->tk_aw_mtx, "fuse answer delivery mutex", NULL, MTX_DEF);
357 fiov_init(&ftick->tk_aw_fiov, 0);
358 ftick->tk_aw_type = FT_A_FIOV;
364 fticket_fini(void *mem, int size)
366 struct fuse_ticket *ftick = mem;
368 fiov_teardown(&ftick->tk_ms_fiov);
369 fiov_teardown(&ftick->tk_aw_fiov);
370 mtx_destroy(&ftick->tk_aw_mtx);
373 static inline struct fuse_ticket *
374 fticket_alloc(struct fuse_data *data)
376 return uma_zalloc_arg(ticket_zone, data, M_WAITOK);
380 fticket_destroy(struct fuse_ticket *ftick)
382 return uma_zfree(ticket_zone, ftick);
387 fticket_refresh(struct fuse_ticket *ftick)
389 FUSE_ASSERT_MS_DONE(ftick);
390 FUSE_ASSERT_AW_DONE(ftick);
392 fiov_refresh(&ftick->tk_ms_fiov);
393 ftick->tk_ms_bufdata = NULL;
394 ftick->tk_ms_bufsize = 0;
395 ftick->tk_ms_type = FT_M_FIOV;
397 bzero(&ftick->tk_aw_ohead, sizeof(struct fuse_out_header));
399 fiov_refresh(&ftick->tk_aw_fiov);
400 ftick->tk_aw_errno = 0;
401 ftick->tk_aw_bufdata = NULL;
402 ftick->tk_aw_bufsize = 0;
403 ftick->tk_aw_type = FT_A_FIOV;
408 /* Prepar the ticket to be reused, but don't clear its data buffers */
410 fticket_reset(struct fuse_ticket *ftick)
412 FUSE_ASSERT_MS_DONE(ftick);
413 FUSE_ASSERT_AW_DONE(ftick);
415 ftick->tk_ms_bufdata = NULL;
416 ftick->tk_ms_bufsize = 0;
417 ftick->tk_ms_type = FT_M_FIOV;
419 bzero(&ftick->tk_aw_ohead, sizeof(struct fuse_out_header));
421 ftick->tk_aw_errno = 0;
422 ftick->tk_aw_bufdata = NULL;
423 ftick->tk_aw_bufsize = 0;
424 ftick->tk_aw_type = FT_A_FIOV;
430 fticket_wait_answer(struct fuse_ticket *ftick)
432 struct thread *td = curthread;
433 sigset_t blockedset, oldset;
435 struct fuse_data *data;
436 SIGEMPTYSET(blockedset);
438 kern_sigprocmask(td, SIG_BLOCK, NULL, &oldset, 0);
440 fuse_lck_mtx_lock(ftick->tk_aw_mtx);
443 if (fticket_answered(ftick)) {
446 data = ftick->tk_data;
448 if (fdata_get_dead(data)) {
450 fticket_set_answered(ftick);
453 kern_sigprocmask(td, SIG_BLOCK, &blockedset, NULL, 0);
454 err = msleep(ftick, &ftick->tk_aw_mtx, PCATCH, "fu_ans",
455 data->daemon_timeout * hz);
456 kern_sigprocmask(td, SIG_SETMASK, &oldset, NULL, 0);
457 if (err == EWOULDBLOCK) {
458 SDT_PROBE2(fuse, , ipc, trace, 3,
459 "fticket_wait_answer: EWOULDBLOCK");
460 #ifdef XXXIP /* die conditionally */
461 if (!fdata_get_dead(data)) {
462 fdata_set_dead(data);
466 fticket_set_answered(ftick);
467 } else if ((err == EINTR || err == ERESTART)) {
469 * Whether we get EINTR or ERESTART depends on whether
470 * SA_RESTART was set by sigaction(2).
472 * Try to interrupt the operation and wait for an EINTR response
473 * to the original operation. If the file system does not
474 * support FUSE_INTERRUPT, then we'll just wait for it to
475 * complete like normal. If it does support FUSE_INTERRUPT,
476 * then it will either respond EINTR to the original operation,
477 * or EAGAIN to the interrupt.
481 SDT_PROBE2(fuse, , ipc, trace, 4,
482 "fticket_wait_answer: interrupt");
483 fuse_lck_mtx_unlock(ftick->tk_aw_mtx);
484 fuse_interrupt_send(ftick, err);
486 PROC_LOCK(td->td_proc);
487 mtx_lock(&td->td_proc->p_sigacts->ps_mtx);
489 mtx_unlock(&td->td_proc->p_sigacts->ps_mtx);
490 PROC_UNLOCK(td->td_proc);
492 fuse_lck_mtx_lock(ftick->tk_aw_mtx);
493 if (!sig_isfatal(td->td_proc, sig)) {
495 * Block the just-delivered signal while we wait for an
498 SIGADDSET(blockedset, sig);
501 /* Return immediately for fatal signals */
504 SDT_PROBE2(fuse, , ipc, trace, 6,
505 "fticket_wait_answer: other error");
507 SDT_PROBE2(fuse, , ipc, trace, 7, "fticket_wait_answer: OK");
510 if (!(err || fticket_answered(ftick))) {
511 SDT_PROBE2(fuse, , ipc, trace, 1,
512 "FUSE: requester was woken up but still no answer");
515 fuse_lck_mtx_unlock(ftick->tk_aw_mtx);
522 fticket_aw_pull_uio(struct fuse_ticket *ftick, struct uio *uio)
525 size_t len = uio_resid(uio);
528 switch (ftick->tk_aw_type) {
530 fiov_adjust(fticket_resp(ftick), len);
531 err = uiomove(fticket_resp(ftick)->base, len, uio);
535 ftick->tk_aw_bufsize = len;
536 err = uiomove(ftick->tk_aw_bufdata, len, uio);
540 panic("FUSE: unknown answer type for ticket %p", ftick);
547 fticket_pull(struct fuse_ticket *ftick, struct uio *uio)
551 if (ftick->tk_aw_ohead.error) {
554 err = fuse_body_audit(ftick, uio_resid(uio));
556 err = fticket_aw_pull_uio(ftick, uio);
562 fdata_alloc(struct cdev *fdev, struct ucred *cred)
564 struct fuse_data *data;
566 data = malloc(sizeof(struct fuse_data), M_FUSEMSG, M_WAITOK | M_ZERO);
569 mtx_init(&data->ms_mtx, "fuse message list mutex", NULL, MTX_DEF);
570 STAILQ_INIT(&data->ms_head);
571 mtx_init(&data->aw_mtx, "fuse answer list mutex", NULL, MTX_DEF);
572 TAILQ_INIT(&data->aw_head);
573 data->daemoncred = crhold(cred);
574 data->daemon_timeout = FUSE_DEFAULT_DAEMON_TIMEOUT;
575 sx_init(&data->rename_lock, "fuse rename lock");
582 fdata_trydestroy(struct fuse_data *data)
585 MPASS(data->ref >= 0);
589 /* Driving off stage all that stuff thrown at device... */
590 mtx_destroy(&data->ms_mtx);
591 mtx_destroy(&data->aw_mtx);
592 sx_destroy(&data->rename_lock);
594 crfree(data->daemoncred);
596 free(data, M_FUSEMSG);
600 fdata_set_dead(struct fuse_data *data)
603 if (fdata_get_dead(data)) {
607 fuse_lck_mtx_lock(data->ms_mtx);
608 data->dataflags |= FSESS_DEAD;
610 selwakeuppri(&data->ks_rsel, PZERO + 1);
611 wakeup(&data->ticketer);
612 fuse_lck_mtx_unlock(data->ms_mtx);
617 fuse_ticket_fetch(struct fuse_data *data)
620 struct fuse_ticket *ftick;
622 ftick = fticket_alloc(data);
624 if (!(data->dataflags & FSESS_INITED)) {
625 /* Sleep until get answer for INIT messsage */
627 if (!(data->dataflags & FSESS_INITED) && data->ticketer > 2) {
628 err = msleep(&data->ticketer, &fuse_mtx, PCATCH | PDROP,
631 fdata_set_dead(data);
639 fuse_ticket_drop(struct fuse_ticket *ftick)
643 die = refcount_release(&ftick->tk_refcount);
645 fticket_destroy(ftick);
651 fuse_insert_callback(struct fuse_ticket *ftick, fuse_handler_t * handler)
653 if (fdata_get_dead(ftick->tk_data)) {
656 ftick->tk_aw_handler = handler;
658 fuse_lck_mtx_lock(ftick->tk_data->aw_mtx);
660 fuse_lck_mtx_unlock(ftick->tk_data->aw_mtx);
664 fuse_insert_message(struct fuse_ticket *ftick)
666 if (ftick->tk_flag & FT_DIRTY) {
667 panic("FUSE: ticket reused without being refreshed");
669 ftick->tk_flag |= FT_DIRTY;
671 if (fdata_get_dead(ftick->tk_data)) {
674 fuse_lck_mtx_lock(ftick->tk_data->ms_mtx);
676 wakeup_one(ftick->tk_data);
677 selwakeuppri(&ftick->tk_data->ks_rsel, PZERO + 1);
678 fuse_lck_mtx_unlock(ftick->tk_data->ms_mtx);
682 fuse_body_audit(struct fuse_ticket *ftick, size_t blen)
685 enum fuse_opcode opcode;
687 opcode = fticket_opcode(ftick);
691 err = (blen == sizeof(struct fuse_entry_out)) ? 0 : EINVAL;
695 panic("FUSE: a handler has been intalled for FUSE_FORGET");
699 err = (blen == sizeof(struct fuse_attr_out)) ? 0 : EINVAL;
703 err = (blen == sizeof(struct fuse_attr_out)) ? 0 : EINVAL;
707 err = (PAGE_SIZE >= blen) ? 0 : EINVAL;
711 err = (blen == sizeof(struct fuse_entry_out)) ? 0 : EINVAL;
715 err = (blen == sizeof(struct fuse_entry_out)) ? 0 : EINVAL;
719 err = (blen == sizeof(struct fuse_entry_out)) ? 0 : EINVAL;
723 err = (blen == 0) ? 0 : EINVAL;
727 err = (blen == 0) ? 0 : EINVAL;
731 err = (blen == 0) ? 0 : EINVAL;
735 err = (blen == sizeof(struct fuse_entry_out)) ? 0 : EINVAL;
739 err = (blen == sizeof(struct fuse_open_out)) ? 0 : EINVAL;
743 err = (((struct fuse_read_in *)(
744 (char *)ftick->tk_ms_fiov.base +
745 sizeof(struct fuse_in_header)
746 ))->size >= blen) ? 0 : EINVAL;
750 err = (blen == sizeof(struct fuse_write_out)) ? 0 : EINVAL;
754 if (fuse_libabi_geq(ftick->tk_data, 7, 4)) {
755 err = (blen == sizeof(struct fuse_statfs_out)) ?
758 err = (blen == FUSE_COMPAT_STATFS_SIZE) ? 0 : EINVAL;
763 err = (blen == 0) ? 0 : EINVAL;
767 err = (blen == 0) ? 0 : EINVAL;
771 err = (blen == 0) ? 0 : EINVAL;
777 * These can have varying response lengths, and 0 length
778 * isn't necessarily invalid.
783 case FUSE_REMOVEXATTR:
784 err = (blen == 0) ? 0 : EINVAL;
788 err = (blen == 0) ? 0 : EINVAL;
792 if (blen == sizeof(struct fuse_init_out) || blen == 8) {
800 err = (blen == sizeof(struct fuse_open_out)) ? 0 : EINVAL;
804 err = (((struct fuse_read_in *)(
805 (char *)ftick->tk_ms_fiov.base +
806 sizeof(struct fuse_in_header)
807 ))->size >= blen) ? 0 : EINVAL;
810 case FUSE_RELEASEDIR:
811 err = (blen == 0) ? 0 : EINVAL;
815 err = (blen == 0) ? 0 : EINVAL;
819 err = (blen == sizeof(struct fuse_lk_out)) ? 0 : EINVAL;
823 err = (blen == 0) ? 0 : EINVAL;
827 err = (blen == 0) ? 0 : EINVAL;
831 err = (blen == 0) ? 0 : EINVAL;
835 err = (blen == sizeof(struct fuse_entry_out) +
836 sizeof(struct fuse_open_out)) ? 0 : EINVAL;
840 err = (blen == 0) ? 0 : EINVAL;
844 panic("FUSE: opcodes out of sync (%d)\n", opcode);
851 fuse_setup_ihead(struct fuse_in_header *ihead, struct fuse_ticket *ftick,
852 uint64_t nid, enum fuse_opcode op, size_t blen, pid_t pid,
855 ihead->len = sizeof(*ihead) + blen;
856 ihead->unique = ftick->tk_unique;
861 ihead->uid = cred->cr_uid;
862 ihead->gid = cred->cr_rgid;
866 * fuse_standard_handler just pulls indata and wakes up pretender.
867 * Doesn't try to interpret data, that's left for the pretender.
868 * Though might do a basic size verification before the pull-in takes place
872 fuse_standard_handler(struct fuse_ticket *ftick, struct uio *uio)
876 err = fticket_pull(ftick, uio);
878 fuse_lck_mtx_lock(ftick->tk_aw_mtx);
880 if (!fticket_answered(ftick)) {
881 fticket_set_answered(ftick);
882 ftick->tk_aw_errno = err;
885 fuse_lck_mtx_unlock(ftick->tk_aw_mtx);
891 * Reinitialize a dispatcher from a pid and node id, without resizing or
892 * clearing its data buffers
895 fdisp_refresh_pid(struct fuse_dispatcher *fdip, enum fuse_opcode op,
896 struct mount *mp, uint64_t nid, pid_t pid, struct ucred *cred)
899 MPASS2(sizeof(fdip->finh) + fdip->iosize <= fdip->tick->tk_ms_fiov.len,
900 "Must use fdisp_make_pid to increase the size of the fiov");
901 fticket_reset(fdip->tick);
903 FUSE_DIMALLOC(&fdip->tick->tk_ms_fiov, fdip->finh,
904 fdip->indata, fdip->iosize);
906 fuse_setup_ihead(fdip->finh, fdip->tick, nid, op, fdip->iosize, pid,
910 /* Initialize a dispatcher from a pid and node id */
912 fdisp_make_pid(struct fuse_dispatcher *fdip, enum fuse_opcode op,
913 struct fuse_data *data, uint64_t nid, pid_t pid, struct ucred *cred)
916 fticket_refresh(fdip->tick);
918 fdip->tick = fuse_ticket_fetch(data);
921 /* FUSE_DIMALLOC will bzero the fiovs when it enlarges them */
922 FUSE_DIMALLOC(&fdip->tick->tk_ms_fiov, fdip->finh,
923 fdip->indata, fdip->iosize);
925 fuse_setup_ihead(fdip->finh, fdip->tick, nid, op, fdip->iosize, pid, cred);
929 fdisp_make(struct fuse_dispatcher *fdip, enum fuse_opcode op, struct mount *mp,
930 uint64_t nid, struct thread *td, struct ucred *cred)
932 struct fuse_data *data = fuse_get_mpdata(mp);
933 RECTIFY_TDCR(td, cred);
935 return fdisp_make_pid(fdip, op, data, nid, td->td_proc->p_pid, cred);
939 fdisp_make_vp(struct fuse_dispatcher *fdip, enum fuse_opcode op,
940 struct vnode *vp, struct thread *td, struct ucred *cred)
942 struct mount *mp = vnode_mount(vp);
943 struct fuse_data *data = fuse_get_mpdata(mp);
945 RECTIFY_TDCR(td, cred);
946 return fdisp_make_pid(fdip, op, data, VTOI(vp),
947 td->td_proc->p_pid, cred);
950 /* Refresh a fuse_dispatcher so it can be reused, but don't zero its data */
952 fdisp_refresh_vp(struct fuse_dispatcher *fdip, enum fuse_opcode op,
953 struct vnode *vp, struct thread *td, struct ucred *cred)
955 RECTIFY_TDCR(td, cred);
956 return fdisp_refresh_pid(fdip, op, vnode_mount(vp), VTOI(vp),
957 td->td_proc->p_pid, cred);
961 fdisp_refresh(struct fuse_dispatcher *fdip)
963 fticket_refresh(fdip->tick);
966 SDT_PROBE_DEFINE2(fuse, , ipc, fdisp_wait_answ_error, "char*", "int");
969 fdisp_wait_answ(struct fuse_dispatcher *fdip)
974 fuse_insert_callback(fdip->tick, fuse_standard_handler);
975 fuse_insert_message(fdip->tick);
977 if ((err = fticket_wait_answer(fdip->tick))) {
978 fuse_lck_mtx_lock(fdip->tick->tk_aw_mtx);
980 if (fticket_answered(fdip->tick)) {
982 * Just between noticing the interrupt and getting here,
983 * the standard handler has completed his job.
984 * So we drop the ticket and exit as usual.
986 SDT_PROBE2(fuse, , ipc, fdisp_wait_answ_error,
987 "IPC: interrupted, already answered", err);
988 fuse_lck_mtx_unlock(fdip->tick->tk_aw_mtx);
992 * So we were faster than the standard handler.
993 * Then by setting the answered flag we get *him*
994 * to drop the ticket.
996 SDT_PROBE2(fuse, , ipc, fdisp_wait_answ_error,
997 "IPC: interrupted, setting to answered", err);
998 fticket_set_answered(fdip->tick);
999 fuse_lck_mtx_unlock(fdip->tick->tk_aw_mtx);
1004 if (fdip->tick->tk_aw_errno) {
1005 SDT_PROBE2(fuse, , ipc, fdisp_wait_answ_error,
1006 "IPC: explicit EIO-ing", fdip->tick->tk_aw_errno);
1010 if ((err = fdip->tick->tk_aw_ohead.error)) {
1011 SDT_PROBE2(fuse, , ipc, fdisp_wait_answ_error,
1012 "IPC: setting status", fdip->tick->tk_aw_ohead.error);
1014 * This means a "proper" fuse syscall error.
1015 * We record this value so the caller will
1016 * be able to know it's not a boring messaging
1017 * failure, if she wishes so (and if not, she can
1018 * just simply propagate the return value of this routine).
1019 * [XXX Maybe a bitflag would do the job too,
1020 * if other flags needed, this will be converted thusly.]
1022 fdip->answ_stat = err;
1025 fdip->answ = fticket_resp(fdip->tick)->base;
1026 fdip->iosize = fticket_resp(fdip->tick)->len;
1037 ticket_zone = uma_zcreate("fuse_ticket", sizeof(struct fuse_ticket),
1038 fticket_ctor, fticket_dtor, fticket_init, fticket_fini,
1043 fuse_ipc_destroy(void)
1045 uma_zdestroy(ticket_zone);