1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2007-2009 Google Inc. and Amit Singh 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions are 9 * met: 10 * 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 16 * distribution. 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. 20 * 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. 32 * 33 * Copyright (C) 2005 Csaba Henk. 34 * All rights reserved. 35 * 36 * Copyright (c) 2019 The FreeBSD Foundation 37 * 38 * Portions of this software were developed by BFF Storage Systems, LLC under 39 * sponsorship from the FreeBSD Foundation. 40 * 41 * Redistribution and use in source and binary forms, with or without 42 * modification, are permitted provided that the following conditions 43 * are met: 44 * 1. Redistributions of source code must retain the above copyright 45 * notice, this list of conditions and the following disclaimer. 46 * 2. Redistributions in binary form must reproduce the above copyright 47 * notice, this list of conditions and the following disclaimer in the 48 * documentation and/or other materials provided with the distribution. 49 * 50 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 53 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 60 * SUCH DAMAGE. 61 * 62 * $FreeBSD$ 63 */ 64 65 #ifndef _FUSE_IPC_H_ 66 #define _FUSE_IPC_H_ 67 68 #include <sys/param.h> 69 #include <sys/refcount.h> 70 71 enum fuse_data_cache_mode { 72 FUSE_CACHE_UC, 73 FUSE_CACHE_WT, 74 FUSE_CACHE_WB, 75 }; 76 77 struct fuse_iov { 78 void *base; 79 size_t len; 80 size_t allocated_size; 81 int credit; 82 }; 83 84 void fiov_init(struct fuse_iov *fiov, size_t size); 85 void fiov_teardown(struct fuse_iov *fiov); 86 void fiov_refresh(struct fuse_iov *fiov); 87 void fiov_adjust(struct fuse_iov *fiov, size_t size); 88 89 #define FUSE_DIMALLOC(fiov, spc1, spc2, amnt) do { \ 90 fiov_adjust(fiov, (sizeof(*(spc1)) + (amnt))); \ 91 (spc1) = (fiov)->base; \ 92 (spc2) = (char *)(fiov)->base + (sizeof(*(spc1))); \ 93 } while (0) 94 95 #define FU_AT_LEAST(siz) max((siz), 160) 96 97 #define FUSE_ASSERT_AW_DONE(ftick) \ 98 KASSERT((ftick)->tk_aw_link.tqe_next == NULL && \ 99 (ftick)->tk_aw_link.tqe_prev == NULL, \ 100 ("FUSE: ticket still on answer delivery list %p", (ftick))) 101 102 #define FUSE_ASSERT_MS_DONE(ftick) \ 103 KASSERT((ftick)->tk_ms_link.stqe_next == NULL, \ 104 ("FUSE: ticket still on message list %p", (ftick))) 105 106 struct fuse_ticket; 107 struct fuse_data; 108 109 typedef int fuse_handler_t(struct fuse_ticket *ftick, struct uio *uio); 110 111 struct fuse_ticket { 112 /* fields giving the identity of the ticket */ 113 uint64_t tk_unique; 114 struct fuse_data *tk_data; 115 int tk_flag; 116 u_int tk_refcount; 117 /* 118 * If this ticket's operation has been interrupted, this will hold the 119 * unique value of the FUSE_INTERRUPT operation. Otherwise, it will be 120 * 0. 121 */ 122 uint64_t irq_unique; 123 124 /* fields for initiating an upgoing message */ 125 struct fuse_iov tk_ms_fiov; 126 void *tk_ms_bufdata; 127 size_t tk_ms_bufsize; 128 enum { FT_M_FIOV, FT_M_BUF } tk_ms_type; 129 STAILQ_ENTRY(fuse_ticket) tk_ms_link; 130 131 /* fields for handling answers coming from userspace */ 132 struct fuse_iov tk_aw_fiov; 133 void *tk_aw_bufdata; 134 size_t tk_aw_bufsize; 135 enum { FT_A_FIOV, FT_A_BUF } tk_aw_type; 136 137 struct fuse_out_header tk_aw_ohead; 138 int tk_aw_errno; 139 struct mtx tk_aw_mtx; 140 fuse_handler_t *tk_aw_handler; 141 TAILQ_ENTRY(fuse_ticket) tk_aw_link; 142 }; 143 144 #define FT_ANSW 0x01 /* request of ticket has already been answered */ 145 #define FT_DIRTY 0x04 /* ticket has been used */ 146 147 static inline struct fuse_iov * 148 fticket_resp(struct fuse_ticket *ftick) 149 { 150 return (&ftick->tk_aw_fiov); 151 } 152 153 static inline bool 154 fticket_answered(struct fuse_ticket *ftick) 155 { 156 mtx_assert(&ftick->tk_aw_mtx, MA_OWNED); 157 return (ftick->tk_flag & FT_ANSW); 158 } 159 160 static inline void 161 fticket_set_answered(struct fuse_ticket *ftick) 162 { 163 mtx_assert(&ftick->tk_aw_mtx, MA_OWNED); 164 ftick->tk_flag |= FT_ANSW; 165 } 166 167 static inline struct fuse_in_header* 168 fticket_in_header(struct fuse_ticket *ftick) 169 { 170 return (struct fuse_in_header *)(ftick->tk_ms_fiov.base); 171 } 172 173 static inline enum fuse_opcode 174 fticket_opcode(struct fuse_ticket *ftick) 175 { 176 return fticket_in_header(ftick)->opcode; 177 } 178 179 int fticket_pull(struct fuse_ticket *ftick, struct uio *uio); 180 181 /* 182 * The data representing a FUSE session. 183 */ 184 struct fuse_data { 185 struct cdev *fdev; 186 struct mount *mp; 187 struct vnode *vroot; 188 struct ucred *daemoncred; 189 int dataflags; 190 int ref; 191 192 struct mtx ms_mtx; 193 STAILQ_HEAD(, fuse_ticket) ms_head; 194 int ms_count; 195 196 struct mtx aw_mtx; 197 TAILQ_HEAD(, fuse_ticket) aw_head; 198 199 /* 200 * Holds the next value of the FUSE operation unique value. 201 * Also, serves as a wakeup channel to prevent any operations from 202 * being created before INIT completes. 203 */ 204 u_long ticketer; 205 206 struct sx rename_lock; 207 208 uint32_t fuse_libabi_major; 209 uint32_t fuse_libabi_minor; 210 211 uint32_t max_readahead_blocks; 212 uint32_t max_write; 213 uint32_t max_read; 214 uint32_t subtype; 215 char volname[MAXPATHLEN]; 216 217 struct selinfo ks_rsel; 218 219 int daemon_timeout; 220 unsigned time_gran; 221 uint64_t notimpl; 222 uint64_t mnt_flag; 223 enum fuse_data_cache_mode cache_mode; 224 }; 225 226 #define FSESS_DEAD 0x0001 /* session is to be closed */ 227 #define FSESS_INITED 0x0004 /* session has been inited */ 228 #define FSESS_DAEMON_CAN_SPY 0x0010 /* let non-owners access this fs */ 229 /* (and being observed by the daemon) */ 230 #define FSESS_PUSH_SYMLINKS_IN 0x0020 /* prefix absolute symlinks with mp */ 231 #define FSESS_DEFAULT_PERMISSIONS 0x0040 /* kernel does permission checking */ 232 #define FSESS_ASYNC_READ 0x1000 /* allow multiple reads of some file */ 233 #define FSESS_POSIX_LOCKS 0x2000 /* daemon supports POSIX locks */ 234 #define FSESS_EXPORT_SUPPORT 0x10000 /* daemon supports NFS-style lookups */ 235 #define FSESS_INTR 0x20000 /* interruptible mounts */ 236 #define FSESS_MNTOPTS_MASK ( \ 237 FSESS_DAEMON_CAN_SPY | FSESS_PUSH_SYMLINKS_IN | \ 238 FSESS_DEFAULT_PERMISSIONS | FSESS_INTR) 239 240 extern int fuse_data_cache_mode; 241 242 static inline struct fuse_data * 243 fuse_get_mpdata(struct mount *mp) 244 { 245 return mp->mnt_data; 246 } 247 248 static inline bool 249 fsess_isimpl(struct mount *mp, int opcode) 250 { 251 struct fuse_data *data = fuse_get_mpdata(mp); 252 253 return ((data->notimpl & (1ULL << opcode)) == 0); 254 255 } 256 static inline void 257 fsess_set_notimpl(struct mount *mp, int opcode) 258 { 259 struct fuse_data *data = fuse_get_mpdata(mp); 260 261 data->notimpl |= (1ULL << opcode); 262 } 263 264 static inline bool 265 fsess_opt_datacache(struct mount *mp) 266 { 267 struct fuse_data *data = fuse_get_mpdata(mp); 268 269 return (data->cache_mode != FUSE_CACHE_UC); 270 } 271 272 static inline bool 273 fsess_opt_mmap(struct mount *mp) 274 { 275 return (fsess_opt_datacache(mp)); 276 } 277 278 static inline bool 279 fsess_opt_writeback(struct mount *mp) 280 { 281 struct fuse_data *data = fuse_get_mpdata(mp); 282 283 return (data->cache_mode == FUSE_CACHE_WB); 284 } 285 286 /* Insert a new upgoing message */ 287 static inline void 288 fuse_ms_push(struct fuse_ticket *ftick) 289 { 290 mtx_assert(&ftick->tk_data->ms_mtx, MA_OWNED); 291 refcount_acquire(&ftick->tk_refcount); 292 STAILQ_INSERT_TAIL(&ftick->tk_data->ms_head, ftick, tk_ms_link); 293 ftick->tk_data->ms_count++; 294 } 295 296 /* Insert a new upgoing message to the front of the queue */ 297 static inline void 298 fuse_ms_push_head(struct fuse_ticket *ftick) 299 { 300 mtx_assert(&ftick->tk_data->ms_mtx, MA_OWNED); 301 refcount_acquire(&ftick->tk_refcount); 302 STAILQ_INSERT_HEAD(&ftick->tk_data->ms_head, ftick, tk_ms_link); 303 ftick->tk_data->ms_count++; 304 } 305 306 static inline struct fuse_ticket * 307 fuse_ms_pop(struct fuse_data *data) 308 { 309 struct fuse_ticket *ftick = NULL; 310 311 mtx_assert(&data->ms_mtx, MA_OWNED); 312 313 if ((ftick = STAILQ_FIRST(&data->ms_head))) { 314 STAILQ_REMOVE_HEAD(&data->ms_head, tk_ms_link); 315 data->ms_count--; 316 #ifdef INVARIANTS 317 MPASS(data->ms_count >= 0); 318 ftick->tk_ms_link.stqe_next = NULL; 319 #endif 320 } 321 322 return (ftick); 323 } 324 325 static inline void 326 fuse_aw_push(struct fuse_ticket *ftick) 327 { 328 mtx_assert(&ftick->tk_data->aw_mtx, MA_OWNED); 329 refcount_acquire(&ftick->tk_refcount); 330 TAILQ_INSERT_TAIL(&ftick->tk_data->aw_head, ftick, tk_aw_link); 331 } 332 333 static inline void 334 fuse_aw_remove(struct fuse_ticket *ftick) 335 { 336 mtx_assert(&ftick->tk_data->aw_mtx, MA_OWNED); 337 TAILQ_REMOVE(&ftick->tk_data->aw_head, ftick, tk_aw_link); 338 #ifdef INVARIANTS 339 ftick->tk_aw_link.tqe_next = NULL; 340 ftick->tk_aw_link.tqe_prev = NULL; 341 #endif 342 } 343 344 static inline struct fuse_ticket * 345 fuse_aw_pop(struct fuse_data *data) 346 { 347 struct fuse_ticket *ftick; 348 349 mtx_assert(&data->aw_mtx, MA_OWNED); 350 351 if ((ftick = TAILQ_FIRST(&data->aw_head)) != NULL) 352 fuse_aw_remove(ftick); 353 354 return (ftick); 355 } 356 357 struct fuse_ticket *fuse_ticket_fetch(struct fuse_data *data); 358 int fuse_ticket_drop(struct fuse_ticket *ftick); 359 void fuse_insert_callback(struct fuse_ticket *ftick, fuse_handler_t *handler); 360 void fuse_insert_message(struct fuse_ticket *ftick, bool irq); 361 362 static inline bool 363 fuse_libabi_geq(struct fuse_data *data, uint32_t abi_maj, uint32_t abi_min) 364 { 365 return (data->fuse_libabi_major > abi_maj || 366 (data->fuse_libabi_major == abi_maj && 367 data->fuse_libabi_minor >= abi_min)); 368 } 369 370 struct fuse_data *fdata_alloc(struct cdev *dev, struct ucred *cred); 371 void fdata_trydestroy(struct fuse_data *data); 372 void fdata_set_dead(struct fuse_data *data); 373 374 static inline bool 375 fdata_get_dead(struct fuse_data *data) 376 { 377 return (data->dataflags & FSESS_DEAD); 378 } 379 380 struct fuse_dispatcher { 381 struct fuse_ticket *tick; 382 struct fuse_in_header *finh; 383 384 void *indata; 385 size_t iosize; 386 uint64_t nodeid; 387 int answ_stat; 388 void *answ; 389 }; 390 391 static inline void 392 fdisp_init(struct fuse_dispatcher *fdisp, size_t iosize) 393 { 394 fdisp->iosize = iosize; 395 fdisp->tick = NULL; 396 } 397 398 static inline void 399 fdisp_destroy(struct fuse_dispatcher *fdisp) 400 { 401 fuse_ticket_drop(fdisp->tick); 402 #ifdef INVARIANTS 403 fdisp->tick = NULL; 404 #endif 405 } 406 407 void fdisp_refresh(struct fuse_dispatcher *fdip); 408 409 void fdisp_make(struct fuse_dispatcher *fdip, enum fuse_opcode op, 410 struct mount *mp, uint64_t nid, struct thread *td, struct ucred *cred); 411 412 void fdisp_make_vp(struct fuse_dispatcher *fdip, enum fuse_opcode op, 413 struct vnode *vp, struct thread *td, struct ucred *cred); 414 415 void fdisp_refresh_vp(struct fuse_dispatcher *fdip, enum fuse_opcode op, 416 struct vnode *vp, struct thread *td, struct ucred *cred); 417 418 int fdisp_wait_answ(struct fuse_dispatcher *fdip); 419 420 static inline int 421 fdisp_simple_putget_vp(struct fuse_dispatcher *fdip, enum fuse_opcode op, 422 struct vnode *vp, struct thread *td, struct ucred *cred) 423 { 424 fdisp_make_vp(fdip, op, vp, td, cred); 425 return (fdisp_wait_answ(fdip)); 426 } 427 428 #endif /* _FUSE_IPC_H_ */ 429