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
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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
63 #include <sys/param.h>
64 #include <sys/refcount.h>
66 enum fuse_data_cache_mode {
75 size_t allocated_size;
79 void fiov_init(struct fuse_iov *fiov, size_t size);
80 void fiov_teardown(struct fuse_iov *fiov);
81 void fiov_refresh(struct fuse_iov *fiov);
82 void fiov_adjust(struct fuse_iov *fiov, size_t size);
84 #define FUSE_DIMALLOC(fiov, spc1, spc2, amnt) do { \
85 fiov_adjust(fiov, (sizeof(*(spc1)) + (amnt))); \
86 (spc1) = (fiov)->base; \
87 (spc2) = (char *)(fiov)->base + (sizeof(*(spc1))); \
90 #define FU_AT_LEAST(siz) max((siz), 160)
92 #define FUSE_ASSERT_AW_DONE(ftick) \
93 KASSERT((ftick)->tk_aw_link.tqe_next == NULL && \
94 (ftick)->tk_aw_link.tqe_prev == NULL, \
95 ("FUSE: ticket still on answer delivery list %p", (ftick)))
97 #define FUSE_ASSERT_MS_DONE(ftick) \
98 KASSERT((ftick)->tk_ms_link.stqe_next == NULL, \
99 ("FUSE: ticket still on message list %p", (ftick)))
104 typedef int fuse_handler_t(struct fuse_ticket *ftick, struct uio *uio);
107 /* fields giving the identity of the ticket */
109 struct fuse_data *tk_data;
113 * If this ticket's operation has been interrupted, this will hold the
114 * unique value of the FUSE_INTERRUPT operation. Otherwise, it will be
119 /* fields for initiating an upgoing message */
120 struct fuse_iov tk_ms_fiov;
122 size_t tk_ms_bufsize;
123 enum { FT_M_FIOV, FT_M_BUF } tk_ms_type;
124 STAILQ_ENTRY(fuse_ticket) tk_ms_link;
126 /* fields for handling answers coming from userspace */
127 struct fuse_iov tk_aw_fiov;
129 size_t tk_aw_bufsize;
130 enum { FT_A_FIOV, FT_A_BUF } tk_aw_type;
132 struct fuse_out_header tk_aw_ohead;
134 struct mtx tk_aw_mtx;
135 fuse_handler_t *tk_aw_handler;
136 TAILQ_ENTRY(fuse_ticket) tk_aw_link;
139 #define FT_ANSW 0x01 /* request of ticket has already been answered */
140 #define FT_DIRTY 0x04 /* ticket has been used */
142 static inline struct fuse_iov *
143 fticket_resp(struct fuse_ticket *ftick)
145 return (&ftick->tk_aw_fiov);
149 fticket_answered(struct fuse_ticket *ftick)
151 mtx_assert(&ftick->tk_aw_mtx, MA_OWNED);
152 return (ftick->tk_flag & FT_ANSW);
156 fticket_set_answered(struct fuse_ticket *ftick)
158 mtx_assert(&ftick->tk_aw_mtx, MA_OWNED);
159 ftick->tk_flag |= FT_ANSW;
162 static inline struct fuse_in_header*
163 fticket_in_header(struct fuse_ticket *ftick)
165 return (struct fuse_in_header *)(ftick->tk_ms_fiov.base);
168 static inline enum fuse_opcode
169 fticket_opcode(struct fuse_ticket *ftick)
171 return fticket_in_header(ftick)->opcode;
174 int fticket_pull(struct fuse_ticket *ftick, struct uio *uio);
177 * The data representing a FUSE session.
183 struct ucred *daemoncred;
188 STAILQ_HEAD(, fuse_ticket) ms_head;
192 TAILQ_HEAD(, fuse_ticket) aw_head;
195 * Holds the next value of the FUSE operation unique value.
196 * Also, serves as a wakeup channel to prevent any operations from
197 * being created before INIT completes.
201 struct sx rename_lock;
203 uint32_t fuse_libabi_major;
204 uint32_t fuse_libabi_minor;
206 uint32_t max_readahead_blocks;
210 char volname[MAXPATHLEN];
212 struct selinfo ks_rsel;
218 enum fuse_data_cache_mode cache_mode;
221 #define FSESS_DEAD 0x0001 /* session is to be closed */
222 #define FSESS_INITED 0x0004 /* session has been inited */
223 #define FSESS_DAEMON_CAN_SPY 0x0010 /* let non-owners access this fs */
224 /* (and being observed by the daemon) */
225 #define FSESS_PUSH_SYMLINKS_IN 0x0020 /* prefix absolute symlinks with mp */
226 #define FSESS_DEFAULT_PERMISSIONS 0x0040 /* kernel does permission checking */
227 #define FSESS_ASYNC_READ 0x1000 /* allow multiple reads of some file */
228 #define FSESS_POSIX_LOCKS 0x2000 /* daemon supports POSIX locks */
229 #define FSESS_EXPORT_SUPPORT 0x10000 /* daemon supports NFS-style lookups */
230 #define FSESS_MNTOPTS_MASK ( \
231 FSESS_DAEMON_CAN_SPY | FSESS_PUSH_SYMLINKS_IN | \
232 FSESS_DEFAULT_PERMISSIONS)
234 extern int fuse_data_cache_mode;
236 static inline struct fuse_data *
237 fuse_get_mpdata(struct mount *mp)
243 fsess_isimpl(struct mount *mp, int opcode)
245 struct fuse_data *data = fuse_get_mpdata(mp);
247 return ((data->notimpl & (1ULL << opcode)) == 0);
251 fsess_set_notimpl(struct mount *mp, int opcode)
253 struct fuse_data *data = fuse_get_mpdata(mp);
255 data->notimpl |= (1ULL << opcode);
259 fsess_opt_datacache(struct mount *mp)
261 struct fuse_data *data = fuse_get_mpdata(mp);
263 return (data->cache_mode != FUSE_CACHE_UC);
267 fsess_opt_mmap(struct mount *mp)
269 return (fsess_opt_datacache(mp));
273 fsess_opt_writeback(struct mount *mp)
275 struct fuse_data *data = fuse_get_mpdata(mp);
277 return (data->cache_mode == FUSE_CACHE_WB);
280 /* Insert a new upgoing message */
282 fuse_ms_push(struct fuse_ticket *ftick)
284 mtx_assert(&ftick->tk_data->ms_mtx, MA_OWNED);
285 refcount_acquire(&ftick->tk_refcount);
286 STAILQ_INSERT_TAIL(&ftick->tk_data->ms_head, ftick, tk_ms_link);
287 ftick->tk_data->ms_count++;
290 /* Insert a new upgoing message to the front of the queue */
292 fuse_ms_push_head(struct fuse_ticket *ftick)
294 mtx_assert(&ftick->tk_data->ms_mtx, MA_OWNED);
295 refcount_acquire(&ftick->tk_refcount);
296 STAILQ_INSERT_HEAD(&ftick->tk_data->ms_head, ftick, tk_ms_link);
297 ftick->tk_data->ms_count++;
300 static inline struct fuse_ticket *
301 fuse_ms_pop(struct fuse_data *data)
303 struct fuse_ticket *ftick = NULL;
305 mtx_assert(&data->ms_mtx, MA_OWNED);
307 if ((ftick = STAILQ_FIRST(&data->ms_head))) {
308 STAILQ_REMOVE_HEAD(&data->ms_head, tk_ms_link);
311 MPASS(data->ms_count >= 0);
312 ftick->tk_ms_link.stqe_next = NULL;
320 fuse_aw_push(struct fuse_ticket *ftick)
322 mtx_assert(&ftick->tk_data->aw_mtx, MA_OWNED);
323 refcount_acquire(&ftick->tk_refcount);
324 TAILQ_INSERT_TAIL(&ftick->tk_data->aw_head, ftick, tk_aw_link);
328 fuse_aw_remove(struct fuse_ticket *ftick)
330 mtx_assert(&ftick->tk_data->aw_mtx, MA_OWNED);
331 TAILQ_REMOVE(&ftick->tk_data->aw_head, ftick, tk_aw_link);
333 ftick->tk_aw_link.tqe_next = NULL;
334 ftick->tk_aw_link.tqe_prev = NULL;
338 static inline struct fuse_ticket *
339 fuse_aw_pop(struct fuse_data *data)
341 struct fuse_ticket *ftick;
343 mtx_assert(&data->aw_mtx, MA_OWNED);
345 if ((ftick = TAILQ_FIRST(&data->aw_head)) != NULL)
346 fuse_aw_remove(ftick);
351 struct fuse_ticket *fuse_ticket_fetch(struct fuse_data *data);
352 int fuse_ticket_drop(struct fuse_ticket *ftick);
353 void fuse_insert_callback(struct fuse_ticket *ftick, fuse_handler_t *handler);
354 void fuse_insert_message(struct fuse_ticket *ftick, bool irq);
357 fuse_libabi_geq(struct fuse_data *data, uint32_t abi_maj, uint32_t abi_min)
359 return (data->fuse_libabi_major > abi_maj ||
360 (data->fuse_libabi_major == abi_maj &&
361 data->fuse_libabi_minor >= abi_min));
364 struct fuse_data *fdata_alloc(struct cdev *dev, struct ucred *cred);
365 void fdata_trydestroy(struct fuse_data *data);
366 void fdata_set_dead(struct fuse_data *data);
369 fdata_get_dead(struct fuse_data *data)
371 return (data->dataflags & FSESS_DEAD);
374 struct fuse_dispatcher {
375 struct fuse_ticket *tick;
376 struct fuse_in_header *finh;
386 fdisp_init(struct fuse_dispatcher *fdisp, size_t iosize)
388 fdisp->iosize = iosize;
393 fdisp_destroy(struct fuse_dispatcher *fdisp)
395 fuse_ticket_drop(fdisp->tick);
401 void fdisp_refresh(struct fuse_dispatcher *fdip);
403 void fdisp_make(struct fuse_dispatcher *fdip, enum fuse_opcode op,
404 struct mount *mp, uint64_t nid, struct thread *td, struct ucred *cred);
406 void fdisp_make_vp(struct fuse_dispatcher *fdip, enum fuse_opcode op,
407 struct vnode *vp, struct thread *td, struct ucred *cred);
409 void fdisp_refresh_vp(struct fuse_dispatcher *fdip, enum fuse_opcode op,
410 struct vnode *vp, struct thread *td, struct ucred *cred);
412 int fdisp_wait_answ(struct fuse_dispatcher *fdip);
415 fdisp_simple_putget_vp(struct fuse_dispatcher *fdip, enum fuse_opcode op,
416 struct vnode *vp, struct thread *td, struct ucred *cred)
418 fdisp_make_vp(fdip, op, vp, td, cred);
419 return (fdisp_wait_answ(fdip));
422 #endif /* _FUSE_IPC_H_ */