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 63 #include <sys/param.h> 64 #include <sys/module.h> 65 #include <sys/systm.h> 66 #include <sys/errno.h> 67 #include <sys/kernel.h> 68 #include <sys/conf.h> 69 #include <sys/filio.h> 70 #include <sys/uio.h> 71 #include <sys/malloc.h> 72 #include <sys/queue.h> 73 #include <sys/limits.h> 74 #include <sys/lock.h> 75 #include <sys/rwlock.h> 76 #include <sys/sx.h> 77 #include <sys/proc.h> 78 #include <sys/mount.h> 79 #include <sys/vnode.h> 80 #include <sys/namei.h> 81 #include <sys/extattr.h> 82 #include <sys/stat.h> 83 #include <sys/unistd.h> 84 #include <sys/filedesc.h> 85 #include <sys/file.h> 86 #include <sys/fcntl.h> 87 #include <sys/dirent.h> 88 #include <sys/bio.h> 89 #include <sys/buf.h> 90 #include <sys/sysctl.h> 91 #include <sys/vmmeter.h> 92 #define EXTERR_CATEGORY EXTERR_CAT_FUSE 93 #include <sys/exterrvar.h> 94 95 #include <vm/vm.h> 96 #include <vm/vm_extern.h> 97 #include <vm/pmap.h> 98 #include <vm/vm_map.h> 99 #include <vm/vm_page.h> 100 #include <vm/vm_param.h> 101 #include <vm/vm_object.h> 102 #include <vm/vm_pager.h> 103 #include <vm/vnode_pager.h> 104 #include <vm/vm_object.h> 105 106 #include "fuse.h" 107 #include "fuse_file.h" 108 #include "fuse_internal.h" 109 #include "fuse_ipc.h" 110 #include "fuse_node.h" 111 #include "fuse_io.h" 112 113 #include <sys/priv.h> 114 115 /* Maximum number of hardlinks to a single FUSE file */ 116 #define FUSE_LINK_MAX UINT32_MAX 117 118 SDT_PROVIDER_DECLARE(fusefs); 119 /* 120 * Fuse trace probe: 121 * arg0: verbosity. Higher numbers give more verbose messages 122 * arg1: Textual message 123 */ 124 SDT_PROBE_DEFINE2(fusefs, , vnops, trace, "int", "char*"); 125 126 /* vnode ops */ 127 static vop_access_t fuse_vnop_access; 128 static vop_advlock_t fuse_vnop_advlock; 129 static vop_allocate_t fuse_vnop_allocate; 130 static vop_bmap_t fuse_vnop_bmap; 131 static vop_close_t fuse_fifo_close; 132 static vop_close_t fuse_vnop_close; 133 static vop_copy_file_range_t fuse_vnop_copy_file_range; 134 static vop_create_t fuse_vnop_create; 135 static vop_deallocate_t fuse_vnop_deallocate; 136 static vop_deleteextattr_t fuse_vnop_deleteextattr; 137 static vop_fdatasync_t fuse_vnop_fdatasync; 138 static vop_fsync_t fuse_vnop_fsync; 139 static vop_getattr_t fuse_vnop_getattr; 140 static vop_getextattr_t fuse_vnop_getextattr; 141 static vop_inactive_t fuse_vnop_inactive; 142 static vop_ioctl_t fuse_vnop_ioctl; 143 static vop_link_t fuse_vnop_link; 144 static vop_listextattr_t fuse_vnop_listextattr; 145 static vop_lookup_t fuse_vnop_lookup; 146 static vop_mkdir_t fuse_vnop_mkdir; 147 static vop_mknod_t fuse_vnop_mknod; 148 static vop_open_t fuse_vnop_open; 149 static vop_pathconf_t fuse_vnop_pathconf; 150 static vop_read_t fuse_vnop_read; 151 static vop_readdir_t fuse_vnop_readdir; 152 static vop_readlink_t fuse_vnop_readlink; 153 static vop_reclaim_t fuse_vnop_reclaim; 154 static vop_remove_t fuse_vnop_remove; 155 static vop_rename_t fuse_vnop_rename; 156 static vop_rmdir_t fuse_vnop_rmdir; 157 static vop_setattr_t fuse_vnop_setattr; 158 static vop_setextattr_t fuse_vnop_setextattr; 159 static vop_strategy_t fuse_vnop_strategy; 160 static vop_symlink_t fuse_vnop_symlink; 161 static vop_write_t fuse_vnop_write; 162 static vop_getpages_t fuse_vnop_getpages; 163 static vop_print_t fuse_vnop_print; 164 static vop_vptofh_t fuse_vnop_vptofh; 165 166 struct vop_vector fuse_fifoops = { 167 .vop_default = &fifo_specops, 168 .vop_access = fuse_vnop_access, 169 .vop_close = fuse_fifo_close, 170 .vop_fsync = fuse_vnop_fsync, 171 .vop_getattr = fuse_vnop_getattr, 172 .vop_inactive = fuse_vnop_inactive, 173 .vop_pathconf = fuse_vnop_pathconf, 174 .vop_print = fuse_vnop_print, 175 .vop_read = VOP_PANIC, 176 .vop_reclaim = fuse_vnop_reclaim, 177 .vop_setattr = fuse_vnop_setattr, 178 .vop_write = VOP_PANIC, 179 .vop_vptofh = fuse_vnop_vptofh, 180 }; 181 VFS_VOP_VECTOR_REGISTER(fuse_fifoops); 182 183 struct vop_vector fuse_vnops = { 184 .vop_allocate = fuse_vnop_allocate, 185 .vop_default = &default_vnodeops, 186 .vop_access = fuse_vnop_access, 187 .vop_advlock = fuse_vnop_advlock, 188 .vop_bmap = fuse_vnop_bmap, 189 .vop_close = fuse_vnop_close, 190 .vop_copy_file_range = fuse_vnop_copy_file_range, 191 .vop_create = fuse_vnop_create, 192 .vop_deallocate = fuse_vnop_deallocate, 193 .vop_deleteextattr = fuse_vnop_deleteextattr, 194 .vop_fsync = fuse_vnop_fsync, 195 .vop_fdatasync = fuse_vnop_fdatasync, 196 .vop_getattr = fuse_vnop_getattr, 197 .vop_getextattr = fuse_vnop_getextattr, 198 .vop_inactive = fuse_vnop_inactive, 199 .vop_ioctl = fuse_vnop_ioctl, 200 .vop_link = fuse_vnop_link, 201 .vop_listextattr = fuse_vnop_listextattr, 202 .vop_lookup = fuse_vnop_lookup, 203 .vop_mkdir = fuse_vnop_mkdir, 204 .vop_mknod = fuse_vnop_mknod, 205 .vop_open = fuse_vnop_open, 206 .vop_pathconf = fuse_vnop_pathconf, 207 /* 208 * TODO: implement vop_poll after upgrading to protocol 7.21. 209 * FUSE_POLL was added in protocol 7.11, but it's kind of broken until 210 * 7.21, which adds the ability for the client to choose which poll 211 * events it wants, and for a client to deregister a file handle 212 */ 213 .vop_read = fuse_vnop_read, 214 .vop_readdir = fuse_vnop_readdir, 215 .vop_readlink = fuse_vnop_readlink, 216 .vop_reclaim = fuse_vnop_reclaim, 217 .vop_remove = fuse_vnop_remove, 218 .vop_rename = fuse_vnop_rename, 219 .vop_rmdir = fuse_vnop_rmdir, 220 .vop_setattr = fuse_vnop_setattr, 221 .vop_setextattr = fuse_vnop_setextattr, 222 .vop_strategy = fuse_vnop_strategy, 223 .vop_symlink = fuse_vnop_symlink, 224 .vop_write = fuse_vnop_write, 225 .vop_getpages = fuse_vnop_getpages, 226 .vop_print = fuse_vnop_print, 227 .vop_vptofh = fuse_vnop_vptofh, 228 }; 229 VFS_VOP_VECTOR_REGISTER(fuse_vnops); 230 231 /* Check permission for extattr operations, much like extattr_check_cred */ 232 static int 233 fuse_extattr_check_cred(struct vnode *vp, int ns, struct ucred *cred, 234 struct thread *td, accmode_t accmode) 235 { 236 struct mount *mp = vnode_mount(vp); 237 struct fuse_data *data = fuse_get_mpdata(mp); 238 int default_permissions = data->dataflags & FSESS_DEFAULT_PERMISSIONS; 239 240 /* 241 * Kernel-invoked always succeeds. 242 */ 243 if (cred == NOCRED) 244 return (0); 245 246 /* 247 * Do not allow privileged processes in jail to directly manipulate 248 * system attributes. 249 */ 250 switch (ns) { 251 case EXTATTR_NAMESPACE_SYSTEM: 252 if (default_permissions) { 253 return (priv_check_cred(cred, PRIV_VFS_EXTATTR_SYSTEM)); 254 } 255 return (0); 256 case EXTATTR_NAMESPACE_USER: 257 if (default_permissions) { 258 return (fuse_internal_access(vp, accmode, td, cred)); 259 } 260 return (0); 261 default: 262 return (EPERM); 263 } 264 } 265 266 /* Get a filehandle for a directory */ 267 static int 268 fuse_filehandle_get_dir(struct vnode *vp, struct fuse_filehandle **fufhp, 269 struct ucred *cred, pid_t pid) 270 { 271 if (fuse_filehandle_get(vp, FREAD, fufhp, cred, pid) == 0) 272 return 0; 273 return fuse_filehandle_get(vp, FEXEC, fufhp, cred, pid); 274 } 275 276 /* Send FUSE_FLUSH for this vnode */ 277 static int 278 fuse_flush(struct vnode *vp, struct ucred *cred, pid_t pid, int fflag) 279 { 280 struct fuse_flush_in *ffi; 281 struct fuse_filehandle *fufh; 282 struct fuse_dispatcher fdi; 283 struct thread *td = curthread; 284 struct mount *mp = vnode_mount(vp); 285 int err; 286 287 if (fsess_not_impl(vnode_mount(vp), FUSE_FLUSH)) 288 return 0; 289 290 err = fuse_filehandle_getrw(vp, fflag, &fufh, cred, pid); 291 if (err) 292 return err; 293 294 if (fufh->fuse_open_flags & FOPEN_NOFLUSH && 295 (!fsess_opt_writeback(vnode_mount(vp)))) 296 return (0); 297 298 fdisp_init(&fdi, sizeof(*ffi)); 299 fdisp_make_vp(&fdi, FUSE_FLUSH, vp, td, cred); 300 ffi = fdi.indata; 301 ffi->fh = fufh->fh_id; 302 /* 303 * If the file has a POSIX lock then we're supposed to set lock_owner. 304 * If not, then lock_owner is undefined. So we may as well always set 305 * it. 306 */ 307 ffi->lock_owner = td->td_proc->p_pid; 308 309 err = fdisp_wait_answ(&fdi); 310 if (err == ENOSYS) { 311 fsess_set_notimpl(mp, FUSE_FLUSH); 312 err = 0; 313 } 314 fdisp_destroy(&fdi); 315 return err; 316 } 317 318 /* Close wrapper for fifos. */ 319 static int 320 fuse_fifo_close(struct vop_close_args *ap) 321 { 322 return (fifo_specops.vop_close(ap)); 323 } 324 325 /* Invalidate a range of cached data, whether dirty of not */ 326 static int 327 fuse_inval_buf_range(struct vnode *vp, off_t filesize, off_t start, off_t end) 328 { 329 struct buf *bp; 330 daddr_t left_lbn, end_lbn, right_lbn; 331 off_t new_filesize; 332 int iosize, left_on, right_on, right_blksize; 333 334 iosize = fuse_iosize(vp); 335 left_lbn = start / iosize; 336 end_lbn = howmany(end, iosize); 337 left_on = start & (iosize - 1); 338 if (left_on != 0) { 339 bp = getblk(vp, left_lbn, iosize, PCATCH, 0, 0); 340 if ((bp->b_flags & B_CACHE) != 0 && bp->b_dirtyend >= left_on) { 341 /* 342 * Flush the dirty buffer, because we don't have a 343 * byte-granular way to record which parts of the 344 * buffer are valid. 345 */ 346 bwrite(bp); 347 if (bp->b_error) 348 return (bp->b_error); 349 } else { 350 brelse(bp); 351 } 352 } 353 right_on = end & (iosize - 1); 354 if (right_on != 0) { 355 right_lbn = end / iosize; 356 new_filesize = MAX(filesize, end); 357 right_blksize = MIN(iosize, new_filesize - iosize * right_lbn); 358 bp = getblk(vp, right_lbn, right_blksize, PCATCH, 0, 0); 359 if ((bp->b_flags & B_CACHE) != 0 && bp->b_dirtyoff < right_on) { 360 /* 361 * Flush the dirty buffer, because we don't have a 362 * byte-granular way to record which parts of the 363 * buffer are valid. 364 */ 365 bwrite(bp); 366 if (bp->b_error) 367 return (bp->b_error); 368 } else { 369 brelse(bp); 370 } 371 } 372 373 v_inval_buf_range(vp, left_lbn, end_lbn, iosize); 374 return (0); 375 } 376 377 378 /* Send FUSE_LSEEK for this node */ 379 static int 380 fuse_vnop_do_lseek(struct vnode *vp, struct thread *td, struct ucred *cred, 381 pid_t pid, off_t *offp, int whence) 382 { 383 struct fuse_dispatcher fdi; 384 struct fuse_filehandle *fufh; 385 struct fuse_lseek_in *flsi; 386 struct fuse_lseek_out *flso; 387 struct mount *mp = vnode_mount(vp); 388 int err; 389 390 ASSERT_VOP_LOCKED(vp, __func__); 391 392 err = fuse_filehandle_getrw(vp, FREAD, &fufh, cred, pid); 393 if (err) 394 return (err); 395 fdisp_init(&fdi, sizeof(*flsi)); 396 fdisp_make_vp(&fdi, FUSE_LSEEK, vp, td, cred); 397 flsi = fdi.indata; 398 flsi->fh = fufh->fh_id; 399 flsi->offset = *offp; 400 flsi->whence = whence; 401 err = fdisp_wait_answ(&fdi); 402 if (err == ENOSYS) { 403 fsess_set_notimpl(mp, FUSE_LSEEK); 404 } else if (err == ENXIO) { 405 /* Note: ENXIO means "no more hole/data regions until EOF" */ 406 fsess_set_impl(mp, FUSE_LSEEK); 407 } else if (err == 0) { 408 fsess_set_impl(mp, FUSE_LSEEK); 409 flso = fdi.answ; 410 *offp = flso->offset; 411 } 412 fdisp_destroy(&fdi); 413 414 return (err); 415 } 416 417 /* 418 struct vnop_access_args { 419 struct vnode *a_vp; 420 #if VOP_ACCESS_TAKES_ACCMODE_T 421 accmode_t a_accmode; 422 #else 423 int a_mode; 424 #endif 425 struct ucred *a_cred; 426 struct thread *a_td; 427 }; 428 */ 429 static int 430 fuse_vnop_access(struct vop_access_args *ap) 431 { 432 struct vnode *vp = ap->a_vp; 433 int accmode = ap->a_accmode; 434 struct ucred *cred = ap->a_cred; 435 436 struct fuse_data *data = fuse_get_mpdata(vnode_mount(vp)); 437 438 int err; 439 440 if (fuse_isdeadfs(vp)) { 441 if (vnode_isvroot(vp)) { 442 return 0; 443 } 444 return (EXTERROR(ENXIO, "This FUSE session is about " 445 "to be closed")); 446 } 447 if (!(data->dataflags & FSESS_INITED)) { 448 if (vnode_isvroot(vp)) { 449 if (priv_check_cred(cred, PRIV_VFS_ADMIN) || 450 (fuse_match_cred(data->daemoncred, cred) == 0)) { 451 return 0; 452 } 453 } 454 return (EXTERROR(EBADF, "Access denied until FUSE session " 455 "is initialized")); 456 } 457 if (vnode_islnk(vp)) { 458 return 0; 459 } 460 461 err = fuse_internal_access(vp, accmode, ap->a_td, ap->a_cred); 462 return err; 463 } 464 465 /* 466 * struct vop_advlock_args { 467 * struct vop_generic_args a_gen; 468 * struct vnode *a_vp; 469 * void *a_id; 470 * int a_op; 471 * struct flock *a_fl; 472 * int a_flags; 473 * } 474 */ 475 static int 476 fuse_vnop_advlock(struct vop_advlock_args *ap) 477 { 478 struct vnode *vp = ap->a_vp; 479 struct flock *fl = ap->a_fl; 480 struct thread *td = curthread; 481 struct ucred *cred = td->td_ucred; 482 pid_t pid = td->td_proc->p_pid; 483 struct fuse_filehandle *fufh; 484 struct fuse_dispatcher fdi; 485 struct fuse_lk_in *fli; 486 struct fuse_lk_out *flo; 487 struct vattr vattr; 488 enum fuse_opcode op; 489 off_t size, start; 490 int dataflags, err; 491 int flags = ap->a_flags; 492 493 dataflags = fuse_get_mpdata(vnode_mount(vp))->dataflags; 494 495 if (fuse_isdeadfs(vp)) { 496 return (EXTERROR(ENXIO, "This FUSE session is about " 497 "to be closed")); 498 } 499 500 switch(ap->a_op) { 501 case F_GETLK: 502 op = FUSE_GETLK; 503 break; 504 case F_SETLK: 505 if (flags & F_WAIT) 506 op = FUSE_SETLKW; 507 else 508 op = FUSE_SETLK; 509 break; 510 case F_UNLCK: 511 op = FUSE_SETLK; 512 break; 513 default: 514 return (EXTERROR(EINVAL, "Unsupported lock flags")); 515 } 516 517 if (!(dataflags & FSESS_POSIX_LOCKS)) 518 return vop_stdadvlock(ap); 519 /* FUSE doesn't properly support flock until protocol 7.17 */ 520 if (flags & F_FLOCK) 521 return vop_stdadvlock(ap); 522 523 vn_lock(vp, LK_SHARED | LK_RETRY); 524 525 switch (fl->l_whence) { 526 case SEEK_SET: 527 case SEEK_CUR: 528 /* 529 * Caller is responsible for adding any necessary offset 530 * when SEEK_CUR is used. 531 */ 532 start = fl->l_start; 533 break; 534 535 case SEEK_END: 536 err = fuse_internal_getattr(vp, &vattr, cred, td); 537 if (err) 538 goto out; 539 size = vattr.va_size; 540 if (size > OFF_MAX || 541 (fl->l_start > 0 && size > OFF_MAX - fl->l_start)) { 542 err = EXTERROR(EOVERFLOW, "Offset is too large"); 543 goto out; 544 } 545 start = size + fl->l_start; 546 break; 547 548 default: 549 return (EXTERROR(EINVAL, "Unsupported offset type")); 550 } 551 552 err = fuse_filehandle_get_anyflags(vp, &fufh, cred, pid); 553 if (err) 554 goto out; 555 556 fdisp_init(&fdi, sizeof(*fli)); 557 558 fdisp_make_vp(&fdi, op, vp, td, cred); 559 fli = fdi.indata; 560 fli->fh = fufh->fh_id; 561 fli->owner = td->td_proc->p_pid; 562 fli->lk.start = start; 563 if (fl->l_len != 0) 564 fli->lk.end = start + fl->l_len - 1; 565 else 566 fli->lk.end = INT64_MAX; 567 fli->lk.type = fl->l_type; 568 fli->lk.pid = td->td_proc->p_pid; 569 570 err = fdisp_wait_answ(&fdi); 571 fdisp_destroy(&fdi); 572 573 if (err == 0 && op == FUSE_GETLK) { 574 flo = fdi.answ; 575 fl->l_type = flo->lk.type; 576 fl->l_whence = SEEK_SET; 577 if (flo->lk.type != F_UNLCK) { 578 fl->l_pid = flo->lk.pid; 579 fl->l_start = flo->lk.start; 580 if (flo->lk.end == INT64_MAX) 581 fl->l_len = 0; 582 else 583 fl->l_len = flo->lk.end - flo->lk.start + 1; 584 fl->l_start = flo->lk.start; 585 } 586 } 587 588 out: 589 VOP_UNLOCK(vp); 590 return err; 591 } 592 593 static int 594 fuse_vnop_allocate(struct vop_allocate_args *ap) 595 { 596 struct vnode *vp = ap->a_vp; 597 off_t *len = ap->a_len; 598 off_t *offset = ap->a_offset; 599 struct ucred *cred = ap->a_cred; 600 struct fuse_filehandle *fufh; 601 struct mount *mp = vnode_mount(vp); 602 struct fuse_dispatcher fdi; 603 struct fuse_fallocate_in *ffi; 604 struct uio io; 605 pid_t pid = curthread->td_proc->p_pid; 606 struct fuse_vnode_data *fvdat = VTOFUD(vp); 607 off_t filesize; 608 int err; 609 610 if (fuse_isdeadfs(vp)) 611 return (EXTERROR(ENXIO, "This FUSE session is about " 612 "to be closed")); 613 614 switch (vp->v_type) { 615 case VFIFO: 616 return (ESPIPE); 617 case VLNK: 618 case VREG: 619 break; 620 default: 621 return (ENODEV); 622 } 623 624 if (vfs_isrdonly(mp)) 625 return (EROFS); 626 627 if (fsess_not_impl(mp, FUSE_FALLOCATE)) 628 return (EXTERROR(EINVAL, "This server does not implement " 629 "FUSE_FALLOCATE")); 630 631 io.uio_offset = *offset; 632 io.uio_resid = *len; 633 err = vn_rlimit_fsize(vp, &io, curthread); 634 if (err) 635 return (err); 636 637 err = fuse_filehandle_getrw(vp, FWRITE, &fufh, cred, pid); 638 if (err) 639 return (err); 640 641 fuse_vnode_update(vp, FN_MTIMECHANGE | FN_CTIMECHANGE); 642 643 err = fuse_vnode_size(vp, &filesize, cred, curthread); 644 if (err) 645 return (err); 646 fuse_inval_buf_range(vp, filesize, *offset, *offset + *len); 647 648 fdisp_init(&fdi, sizeof(*ffi)); 649 fdisp_make_vp(&fdi, FUSE_FALLOCATE, vp, curthread, cred); 650 ffi = fdi.indata; 651 ffi->fh = fufh->fh_id; 652 ffi->offset = *offset; 653 ffi->length = *len; 654 ffi->mode = 0; 655 err = fdisp_wait_answ(&fdi); 656 657 if (err == ENOSYS) { 658 fsess_set_notimpl(mp, FUSE_FALLOCATE); 659 err = EXTERROR(EINVAL, "This server does not implement " 660 "FUSE_ALLOCATE"); 661 } else if (err == EOPNOTSUPP) { 662 /* 663 * The file system server does not support FUSE_FALLOCATE with 664 * the supplied mode for this particular file. 665 */ 666 err = EXTERROR(EINVAL, "This file can't be pre-allocated"); 667 } else if (!err) { 668 *offset += *len; 669 *len = 0; 670 fuse_vnode_undirty_cached_timestamps(vp, false); 671 fuse_internal_clear_suid_on_write(vp, cred, curthread); 672 if (*offset > fvdat->cached_attrs.va_size) { 673 fuse_vnode_setsize(vp, *offset, false); 674 getnanouptime(&fvdat->last_local_modify); 675 } 676 } 677 678 fdisp_destroy(&fdi); 679 return (err); 680 } 681 682 /* { 683 struct vnode *a_vp; 684 daddr_t a_bn; 685 struct bufobj **a_bop; 686 daddr_t *a_bnp; 687 int *a_runp; 688 int *a_runb; 689 } */ 690 static int 691 fuse_vnop_bmap(struct vop_bmap_args *ap) 692 { 693 struct vnode *vp = ap->a_vp; 694 struct bufobj **bo = ap->a_bop; 695 struct thread *td = curthread; 696 struct mount *mp; 697 struct fuse_dispatcher fdi; 698 struct fuse_bmap_in *fbi; 699 struct fuse_bmap_out *fbo; 700 struct fuse_data *data; 701 struct fuse_vnode_data *fvdat = VTOFUD(vp); 702 uint64_t biosize; 703 off_t fsize; 704 daddr_t lbn = ap->a_bn; 705 daddr_t *pbn = ap->a_bnp; 706 int *runp = ap->a_runp; 707 int *runb = ap->a_runb; 708 int error = 0; 709 int maxrun; 710 711 if (fuse_isdeadfs(vp)) { 712 return (EXTERROR(ENXIO, "This FUSE session is about " 713 "to be closed")); 714 } 715 716 mp = vnode_mount(vp); 717 data = fuse_get_mpdata(mp); 718 biosize = fuse_iosize(vp); 719 maxrun = MIN(vp->v_mount->mnt_iosize_max / biosize - 1, 720 data->max_readahead_blocks); 721 722 if (bo != NULL) 723 *bo = &vp->v_bufobj; 724 725 /* 726 * The FUSE_BMAP operation does not include the runp and runb 727 * variables, so we must guess. Report nonzero contiguous runs so 728 * cluster_read will combine adjacent reads. It's worthwhile to reduce 729 * upcalls even if we don't know the true physical layout of the file. 730 * 731 * FUSE file systems may opt out of read clustering in two ways: 732 * * mounting with -onoclusterr 733 * * Setting max_readahead <= maxbcachebuf during FUSE_INIT 734 */ 735 if (runb != NULL) 736 *runb = MIN(lbn, maxrun); 737 if (runp != NULL && maxrun == 0) 738 *runp = 0; 739 else if (runp != NULL) { 740 /* 741 * If the file's size is cached, use that value to calculate 742 * runp, even if the cache is expired. runp is only advisory, 743 * and the risk of getting it wrong is not worth the cost of 744 * another upcall. 745 */ 746 if (fvdat->cached_attrs.va_size != VNOVAL) 747 fsize = fvdat->cached_attrs.va_size; 748 else 749 error = fuse_vnode_size(vp, &fsize, td->td_ucred, td); 750 if (error == 0) 751 *runp = MIN(MAX(0, fsize / (off_t)biosize - lbn - 1), 752 maxrun); 753 else 754 *runp = 0; 755 } 756 757 if (fsess_maybe_impl(mp, FUSE_BMAP)) { 758 fdisp_init(&fdi, sizeof(*fbi)); 759 fdisp_make_vp(&fdi, FUSE_BMAP, vp, td, td->td_ucred); 760 fbi = fdi.indata; 761 fbi->block = lbn; 762 fbi->blocksize = biosize; 763 error = fdisp_wait_answ(&fdi); 764 if (error == ENOSYS) { 765 fdisp_destroy(&fdi); 766 fsess_set_notimpl(mp, FUSE_BMAP); 767 error = 0; 768 } else { 769 fbo = fdi.answ; 770 if (error == 0 && pbn != NULL) 771 *pbn = fbo->block; 772 fdisp_destroy(&fdi); 773 return error; 774 } 775 } 776 777 /* If the daemon doesn't support BMAP, make up a sensible default */ 778 if (pbn != NULL) 779 *pbn = lbn * btodb(biosize); 780 return (error); 781 } 782 783 /* 784 struct vop_close_args { 785 struct vnode *a_vp; 786 int a_fflag; 787 struct ucred *a_cred; 788 struct thread *a_td; 789 }; 790 */ 791 static int 792 fuse_vnop_close(struct vop_close_args *ap) 793 { 794 struct vnode *vp = ap->a_vp; 795 struct mount *mp = vnode_mount(vp); 796 struct ucred *cred = ap->a_cred; 797 int fflag = ap->a_fflag; 798 struct thread *td = ap->a_td; 799 pid_t pid = td->td_proc->p_pid; 800 struct fuse_vnode_data *fvdat = VTOFUD(vp); 801 int err = 0; 802 803 if (fuse_isdeadfs(vp)) 804 return 0; 805 if (vnode_isdir(vp)) 806 return 0; 807 if (fflag & IO_NDELAY) 808 return 0; 809 810 if (cred == NULL) 811 cred = td->td_ucred; 812 813 err = fuse_flush(vp, cred, pid, fflag); 814 if (err == 0 && (fvdat->flag & FN_ATIMECHANGE) && !vfs_isrdonly(mp)) { 815 struct vattr vap; 816 struct fuse_data *data; 817 int dataflags; 818 int access_e = 0; 819 820 data = fuse_get_mpdata(mp); 821 dataflags = data->dataflags; 822 if (dataflags & FSESS_DEFAULT_PERMISSIONS) { 823 struct vattr va; 824 825 fuse_internal_getattr(vp, &va, cred, td); 826 access_e = vaccess(vp->v_type, va.va_mode, va.va_uid, 827 va.va_gid, VWRITE, cred); 828 } 829 if (access_e == 0) { 830 VATTR_NULL(&vap); 831 vap.va_atime = fvdat->cached_attrs.va_atime; 832 /* 833 * Ignore errors setting when setting atime. That 834 * should not cause close(2) to fail. 835 */ 836 fuse_internal_setattr(vp, &vap, td, NULL); 837 } 838 } 839 /* TODO: close the file handle, if we're sure it's no longer used */ 840 if ((fvdat->flag & FN_SIZECHANGE) != 0) { 841 fuse_vnode_savesize(vp, cred, td->td_proc->p_pid); 842 } 843 return err; 844 } 845 846 /* 847 struct vop_copy_file_range_args { 848 struct vop_generic_args a_gen; 849 struct vnode *a_invp; 850 off_t *a_inoffp; 851 struct vnode *a_outvp; 852 off_t *a_outoffp; 853 size_t *a_lenp; 854 unsigned int a_flags; 855 struct ucred *a_incred; 856 struct ucred *a_outcred; 857 struct thread *a_fsizetd; 858 } 859 */ 860 static int 861 fuse_vnop_copy_file_range(struct vop_copy_file_range_args *ap) 862 { 863 struct vnode *invp = ap->a_invp; 864 struct vnode *outvp = ap->a_outvp; 865 struct mount *mp = vnode_mount(invp); 866 struct fuse_vnode_data *outfvdat = VTOFUD(outvp); 867 struct fuse_dispatcher fdi; 868 struct fuse_filehandle *infufh, *outfufh; 869 struct fuse_copy_file_range_in *fcfri; 870 struct ucred *incred = ap->a_incred; 871 struct ucred *outcred = ap->a_outcred; 872 struct fuse_write_out *fwo; 873 struct thread *td; 874 struct uio io; 875 off_t outfilesize; 876 ssize_t r = 0; 877 pid_t pid; 878 int err; 879 880 if (mp == NULL || mp != vnode_mount(outvp)) 881 return (EXTERROR(ENOSYS, "Mount points do not match")); 882 883 if (incred->cr_uid != outcred->cr_uid) 884 return (EXTERROR(ENOSYS, "FUSE_COPY_FILE_RANGE does not " 885 "support different credentials for infd and outfd")); 886 887 if (incred->cr_groups[0] != outcred->cr_groups[0]) 888 return (EXTERROR(ENOSYS, "FUSE_COPY_FILE_RANGE does not " 889 "support different credentials for infd and outfd")); 890 891 /* Caller busied mp, mnt_data can be safely accessed. */ 892 if (fsess_not_impl(mp, FUSE_COPY_FILE_RANGE)) 893 return (EXTERROR(ENOSYS, "This daemon does not " 894 "implement COPY_FILE_RANGE")); 895 896 if (ap->a_fsizetd == NULL) 897 td = curthread; 898 else 899 td = ap->a_fsizetd; 900 pid = td->td_proc->p_pid; 901 902 vn_lock_pair(invp, false, LK_SHARED, outvp, false, LK_EXCLUSIVE); 903 if (invp->v_data == NULL || outvp->v_data == NULL) { 904 err = EXTERROR(EBADF, "vnode got reclaimed"); 905 goto unlock; 906 } 907 908 err = fuse_filehandle_getrw(invp, FREAD, &infufh, incred, pid); 909 if (err) 910 goto unlock; 911 912 err = fuse_filehandle_getrw(outvp, FWRITE, &outfufh, outcred, pid); 913 if (err) 914 goto unlock; 915 916 io.uio_resid = *ap->a_lenp; 917 if (ap->a_fsizetd) { 918 io.uio_offset = *ap->a_outoffp; 919 err = vn_rlimit_fsizex(outvp, &io, 0, &r, ap->a_fsizetd); 920 if (err != 0) 921 goto unlock; 922 } 923 924 err = fuse_vnode_size(outvp, &outfilesize, outcred, curthread); 925 if (err) 926 goto unlock; 927 928 vnode_pager_clean_sync(invp); 929 err = fuse_inval_buf_range(outvp, outfilesize, *ap->a_outoffp, 930 *ap->a_outoffp + io.uio_resid); 931 if (err) 932 goto unlock; 933 934 fdisp_init(&fdi, sizeof(*fcfri)); 935 fdisp_make_vp(&fdi, FUSE_COPY_FILE_RANGE, invp, td, incred); 936 fcfri = fdi.indata; 937 fcfri->fh_in = infufh->fh_id; 938 fcfri->off_in = *ap->a_inoffp; 939 fcfri->nodeid_out = VTOI(outvp); 940 fcfri->fh_out = outfufh->fh_id; 941 fcfri->off_out = *ap->a_outoffp; 942 fcfri->len = io.uio_resid; 943 fcfri->flags = 0; 944 945 err = fdisp_wait_answ(&fdi); 946 if (err == 0) { 947 fwo = fdi.answ; 948 *ap->a_lenp = fwo->size; 949 *ap->a_inoffp += fwo->size; 950 *ap->a_outoffp += fwo->size; 951 fuse_internal_clear_suid_on_write(outvp, outcred, td); 952 if (*ap->a_outoffp > outfvdat->cached_attrs.va_size) { 953 fuse_vnode_setsize(outvp, *ap->a_outoffp, false); 954 getnanouptime(&outfvdat->last_local_modify); 955 } 956 fuse_vnode_update(invp, FN_ATIMECHANGE); 957 fuse_vnode_update(outvp, FN_MTIMECHANGE | FN_CTIMECHANGE); 958 } 959 fdisp_destroy(&fdi); 960 961 unlock: 962 if (invp != outvp) 963 VOP_UNLOCK(invp); 964 VOP_UNLOCK(outvp); 965 966 if (err == ENOSYS) 967 fsess_set_notimpl(mp, FUSE_COPY_FILE_RANGE); 968 969 /* 970 * No need to call vn_rlimit_fsizex_res before return, since the uio is 971 * local. 972 */ 973 return (err); 974 } 975 976 static void 977 fdisp_make_mknod_for_fallback( 978 struct fuse_dispatcher *fdip, 979 struct componentname *cnp, 980 struct vnode *dvp, 981 uint64_t parentnid, 982 struct thread *td, 983 struct ucred *cred, 984 mode_t mode, 985 enum fuse_opcode *op) 986 { 987 struct fuse_mknod_in *fmni; 988 989 fdisp_init(fdip, sizeof(*fmni) + cnp->cn_namelen + 1); 990 *op = FUSE_MKNOD; 991 fdisp_make(fdip, *op, vnode_mount(dvp), parentnid, td, cred); 992 fmni = fdip->indata; 993 fmni->mode = mode; 994 fmni->rdev = 0; 995 memcpy((char *)fdip->indata + sizeof(*fmni), cnp->cn_nameptr, 996 cnp->cn_namelen); 997 ((char *)fdip->indata)[sizeof(*fmni) + cnp->cn_namelen] = '\0'; 998 } 999 /* 1000 struct vnop_create_args { 1001 struct vnode *a_dvp; 1002 struct vnode **a_vpp; 1003 struct componentname *a_cnp; 1004 struct vattr *a_vap; 1005 }; 1006 */ 1007 static int 1008 fuse_vnop_create(struct vop_create_args *ap) 1009 { 1010 struct vnode *dvp = ap->a_dvp; 1011 struct vnode **vpp = ap->a_vpp; 1012 struct componentname *cnp = ap->a_cnp; 1013 struct vattr *vap = ap->a_vap; 1014 struct thread *td = curthread; 1015 struct ucred *cred = cnp->cn_cred; 1016 1017 struct fuse_data *data; 1018 struct fuse_create_in *fci; 1019 struct fuse_entry_out *feo; 1020 struct fuse_open_out *foo; 1021 struct fuse_dispatcher fdi, fdi2; 1022 struct fuse_dispatcher *fdip = &fdi; 1023 struct fuse_dispatcher *fdip2 = NULL; 1024 1025 int err; 1026 1027 struct mount *mp = vnode_mount(dvp); 1028 data = fuse_get_mpdata(mp); 1029 uint64_t parentnid = VTOFUD(dvp)->nid; 1030 mode_t mode = MAKEIMODE(vap->va_type, vap->va_mode); 1031 enum fuse_opcode op; 1032 int flags; 1033 1034 if (fuse_isdeadfs(dvp)) 1035 return (EXTERROR(ENXIO, "This FUSE session is about " 1036 "to be closed")); 1037 1038 /* FUSE expects sockets to be created with FUSE_MKNOD */ 1039 if (vap->va_type == VSOCK) 1040 return fuse_internal_mknod(dvp, vpp, cnp, vap); 1041 1042 /* 1043 * VOP_CREATE doesn't tell us the open(2) flags, so we guess. Only a 1044 * writable mode makes sense, and we might as well include readability 1045 * too. 1046 */ 1047 flags = O_RDWR; 1048 1049 bzero(&fdi, sizeof(fdi)); 1050 1051 if (vap->va_type != VREG) 1052 return (EXTERROR(EINVAL, "Only regular files can be created")); 1053 1054 if (fsess_not_impl(mp, FUSE_CREATE) || vap->va_type == VSOCK) { 1055 /* Fallback to FUSE_MKNOD/FUSE_OPEN */ 1056 fdisp_make_mknod_for_fallback(fdip, cnp, dvp, parentnid, td, 1057 cred, mode, &op); 1058 } else { 1059 /* Use FUSE_CREATE */ 1060 size_t insize; 1061 1062 op = FUSE_CREATE; 1063 fdisp_init(fdip, sizeof(*fci) + cnp->cn_namelen + 1); 1064 fdisp_make(fdip, op, vnode_mount(dvp), parentnid, td, cred); 1065 fci = fdip->indata; 1066 fci->mode = mode; 1067 fci->flags = O_CREAT | flags; 1068 if (fuse_libabi_geq(data, 7, 12)) { 1069 insize = sizeof(*fci); 1070 fci->umask = td->td_proc->p_pd->pd_cmask; 1071 } else { 1072 insize = sizeof(struct fuse_open_in); 1073 } 1074 1075 memcpy((char *)fdip->indata + insize, cnp->cn_nameptr, 1076 cnp->cn_namelen); 1077 ((char *)fdip->indata)[insize + cnp->cn_namelen] = '\0'; 1078 } 1079 1080 err = fdisp_wait_answ(fdip); 1081 1082 if (err) { 1083 if (err == ENOSYS && op == FUSE_CREATE) { 1084 fsess_set_notimpl(mp, FUSE_CREATE); 1085 fdisp_destroy(fdip); 1086 fdisp_make_mknod_for_fallback(fdip, cnp, dvp, 1087 parentnid, td, cred, mode, &op); 1088 err = fdisp_wait_answ(fdip); 1089 } 1090 if (err) 1091 goto out; 1092 } 1093 1094 feo = fdip->answ; 1095 1096 if ((err = fuse_internal_checkentry(feo, vap->va_type))) { 1097 goto out; 1098 } 1099 1100 if (op == FUSE_CREATE) { 1101 if (fuse_libabi_geq(data, 7, 9)) 1102 foo = (struct fuse_open_out*)(feo + 1); 1103 else 1104 foo = (struct fuse_open_out*)((char*)feo + 1105 FUSE_COMPAT_ENTRY_OUT_SIZE); 1106 } else { 1107 /* Issue a separate FUSE_OPEN */ 1108 struct fuse_open_in *foi; 1109 1110 fdip2 = &fdi2; 1111 fdisp_init(fdip2, sizeof(*foi)); 1112 fdisp_make(fdip2, FUSE_OPEN, vnode_mount(dvp), feo->nodeid, td, 1113 cred); 1114 foi = fdip2->indata; 1115 foi->flags = flags; 1116 err = fdisp_wait_answ(fdip2); 1117 if (err) 1118 goto out; 1119 foo = fdip2->answ; 1120 } 1121 err = fuse_vnode_get(mp, feo, feo->nodeid, dvp, vpp, cnp, vap->va_type); 1122 if (err) { 1123 struct fuse_release_in *fri; 1124 uint64_t nodeid = feo->nodeid; 1125 uint64_t fh_id = foo->fh; 1126 1127 fdisp_destroy(fdip); 1128 fdisp_init(fdip, sizeof(*fri)); 1129 fdisp_make(fdip, FUSE_RELEASE, mp, nodeid, td, cred); 1130 fri = fdip->indata; 1131 fri->fh = fh_id; 1132 fri->flags = flags; 1133 fuse_insert_callback(fdip->tick, fuse_internal_forget_callback); 1134 fuse_insert_message(fdip->tick, false); 1135 goto out; 1136 } 1137 ASSERT_VOP_ELOCKED(*vpp, "fuse_vnop_create"); 1138 fuse_internal_cache_attrs(*vpp, &feo->attr, feo->attr_valid, 1139 feo->attr_valid_nsec, NULL, true); 1140 1141 fuse_filehandle_init(*vpp, FUFH_RDWR, NULL, td, cred, foo); 1142 fuse_vnode_open(*vpp, foo->open_flags, td); 1143 /* 1144 * Purge the parent's attribute cache because the daemon should've 1145 * updated its mtime and ctime 1146 */ 1147 fuse_vnode_clear_attr_cache(dvp); 1148 cache_purge_negative(dvp); 1149 1150 out: 1151 if (fdip2) 1152 fdisp_destroy(fdip2); 1153 fdisp_destroy(fdip); 1154 return err; 1155 } 1156 1157 /* 1158 struct vnop_fdatasync_args { 1159 struct vop_generic_args a_gen; 1160 struct vnode * a_vp; 1161 struct thread * a_td; 1162 }; 1163 */ 1164 static int 1165 fuse_vnop_fdatasync(struct vop_fdatasync_args *ap) 1166 { 1167 struct vnode *vp = ap->a_vp; 1168 struct thread *td = ap->a_td; 1169 int waitfor = MNT_WAIT; 1170 1171 int err = 0; 1172 1173 if (fuse_isdeadfs(vp)) { 1174 return 0; 1175 } 1176 if ((err = vop_stdfdatasync_buf(ap))) 1177 return err; 1178 1179 return fuse_internal_fsync(vp, td, waitfor, true); 1180 } 1181 1182 /* 1183 struct vnop_fsync_args { 1184 struct vop_generic_args a_gen; 1185 struct vnode * a_vp; 1186 int a_waitfor; 1187 struct thread * a_td; 1188 }; 1189 */ 1190 static int 1191 fuse_vnop_fsync(struct vop_fsync_args *ap) 1192 { 1193 struct vnode *vp = ap->a_vp; 1194 struct thread *td = ap->a_td; 1195 int waitfor = ap->a_waitfor; 1196 int err = 0; 1197 1198 if (fuse_isdeadfs(vp)) { 1199 return 0; 1200 } 1201 if ((err = vop_stdfsync(ap))) 1202 return err; 1203 1204 return fuse_internal_fsync(vp, td, waitfor, false); 1205 } 1206 1207 /* 1208 struct vnop_getattr_args { 1209 struct vnode *a_vp; 1210 struct vattr *a_vap; 1211 struct ucred *a_cred; 1212 struct thread *a_td; 1213 }; 1214 */ 1215 static int 1216 fuse_vnop_getattr(struct vop_getattr_args *ap) 1217 { 1218 struct vnode *vp = ap->a_vp; 1219 struct vattr *vap = ap->a_vap; 1220 struct ucred *cred = ap->a_cred; 1221 struct thread *td = curthread; 1222 1223 int err = 0; 1224 int dataflags; 1225 1226 dataflags = fuse_get_mpdata(vnode_mount(vp))->dataflags; 1227 1228 /* Note that we are not bailing out on a dead file system just yet. */ 1229 1230 if (!(dataflags & FSESS_INITED)) { 1231 if (!vnode_isvroot(vp)) { 1232 fdata_set_dead(fuse_get_mpdata(vnode_mount(vp))); 1233 return (EXTERROR(ENOTCONN, "FUSE daemon is not " 1234 "initialized")); 1235 } else { 1236 goto fake; 1237 } 1238 } 1239 err = fuse_internal_getattr(vp, vap, cred, td); 1240 if (err == ENOTCONN && vnode_isvroot(vp)) { 1241 /* see comment in fuse_vfsop_statfs() */ 1242 goto fake; 1243 } else { 1244 return err; 1245 } 1246 1247 fake: 1248 bzero(vap, sizeof(*vap)); 1249 vap->va_type = vnode_vtype(vp); 1250 1251 return 0; 1252 } 1253 1254 /* 1255 struct vnop_inactive_args { 1256 struct vnode *a_vp; 1257 }; 1258 */ 1259 static int 1260 fuse_vnop_inactive(struct vop_inactive_args *ap) 1261 { 1262 struct vnode *vp = ap->a_vp; 1263 struct thread *td = curthread; 1264 1265 struct fuse_vnode_data *fvdat = VTOFUD(vp); 1266 struct fuse_filehandle *fufh, *fufh_tmp; 1267 1268 int need_flush = 1; 1269 1270 LIST_FOREACH_SAFE(fufh, &fvdat->handles, next, fufh_tmp) { 1271 if (need_flush && vp->v_type == VREG) { 1272 if ((VTOFUD(vp)->flag & FN_SIZECHANGE) != 0) { 1273 fuse_vnode_savesize(vp, NULL, 0); 1274 } 1275 if ((fvdat->flag & FN_REVOKED) != 0) 1276 fuse_io_invalbuf(vp, td); 1277 else 1278 fuse_io_flushbuf(vp, MNT_WAIT, td); 1279 need_flush = 0; 1280 } 1281 fuse_filehandle_close(vp, fufh, td, NULL); 1282 } 1283 1284 if ((fvdat->flag & FN_REVOKED) != 0) 1285 vrecycle(vp); 1286 1287 return 0; 1288 } 1289 1290 /* 1291 struct vnop_ioctl_args { 1292 struct vnode *a_vp; 1293 u_long a_command; 1294 caddr_t a_data; 1295 int a_fflag; 1296 struct ucred *a_cred; 1297 struct thread *a_td; 1298 }; 1299 */ 1300 static int 1301 fuse_vnop_ioctl(struct vop_ioctl_args *ap) 1302 { 1303 struct vnode *vp = ap->a_vp; 1304 struct mount *mp = vnode_mount(vp); 1305 struct ucred *cred = ap->a_cred; 1306 off_t *offp; 1307 pid_t pid = ap->a_td->td_proc->p_pid; 1308 int err; 1309 1310 switch (ap->a_command) { 1311 case FIOSEEKDATA: 1312 case FIOSEEKHOLE: 1313 /* Call FUSE_LSEEK, if we can, or fall back to vop_stdioctl */ 1314 if (fsess_maybe_impl(mp, FUSE_LSEEK)) { 1315 int whence; 1316 1317 offp = ap->a_data; 1318 if (ap->a_command == FIOSEEKDATA) 1319 whence = SEEK_DATA; 1320 else 1321 whence = SEEK_HOLE; 1322 1323 vn_lock(vp, LK_SHARED | LK_RETRY); 1324 err = fuse_vnop_do_lseek(vp, ap->a_td, cred, pid, offp, 1325 whence); 1326 VOP_UNLOCK(vp); 1327 } 1328 if (fsess_not_impl(mp, FUSE_LSEEK)) 1329 err = vop_stdioctl(ap); 1330 break; 1331 default: 1332 /* TODO: implement FUSE_IOCTL */ 1333 err = ENOTTY; 1334 break; 1335 } 1336 return (err); 1337 } 1338 1339 1340 /* 1341 struct vnop_link_args { 1342 struct vnode *a_tdvp; 1343 struct vnode *a_vp; 1344 struct componentname *a_cnp; 1345 }; 1346 */ 1347 static int 1348 fuse_vnop_link(struct vop_link_args *ap) 1349 { 1350 struct vnode *vp = ap->a_vp; 1351 struct vnode *tdvp = ap->a_tdvp; 1352 struct componentname *cnp = ap->a_cnp; 1353 1354 struct vattr *vap = VTOVA(vp); 1355 1356 struct fuse_dispatcher fdi; 1357 struct fuse_entry_out *feo; 1358 struct fuse_link_in fli; 1359 1360 int err; 1361 1362 if (fuse_isdeadfs(vp)) { 1363 return (EXTERROR(ENXIO, "This FUSE session is about " 1364 "to be closed")); 1365 } 1366 if (vnode_mount(tdvp) != vnode_mount(vp)) { 1367 return (EXDEV); 1368 } 1369 1370 /* 1371 * This is a seatbelt check to protect naive userspace filesystems from 1372 * themselves and the limitations of the FUSE IPC protocol. If a 1373 * filesystem does not allow attribute caching, assume it is capable of 1374 * validating that nlink does not overflow. 1375 */ 1376 if (vap != NULL && vap->va_nlink >= FUSE_LINK_MAX) 1377 return (EMLINK); 1378 fli.oldnodeid = VTOI(vp); 1379 1380 fdisp_init(&fdi, 0); 1381 fuse_internal_newentry_makerequest(vnode_mount(tdvp), VTOI(tdvp), cnp, 1382 FUSE_LINK, &fli, sizeof(fli), &fdi); 1383 if ((err = fdisp_wait_answ(&fdi))) { 1384 goto out; 1385 } 1386 feo = fdi.answ; 1387 1388 if (fli.oldnodeid != feo->nodeid) { 1389 static const char exterr[] = "Server assigned wrong inode " 1390 "for a hard link."; 1391 struct fuse_data *data = fuse_get_mpdata(vnode_mount(vp)); 1392 fuse_warn(data, FSESS_WARN_ILLEGAL_INODE, exterr); 1393 fuse_vnode_clear_attr_cache(vp); 1394 fuse_vnode_clear_attr_cache(tdvp); 1395 err = EXTERROR(EIO, exterr); 1396 goto out; 1397 } 1398 1399 err = fuse_internal_checkentry(feo, vnode_vtype(vp)); 1400 if (!err) { 1401 /* 1402 * Purge the parent's attribute cache because the daemon 1403 * should've updated its mtime and ctime 1404 */ 1405 fuse_vnode_clear_attr_cache(tdvp); 1406 fuse_internal_cache_attrs(vp, &feo->attr, feo->attr_valid, 1407 feo->attr_valid_nsec, NULL, true); 1408 } 1409 out: 1410 fdisp_destroy(&fdi); 1411 return err; 1412 } 1413 1414 struct fuse_lookup_alloc_arg { 1415 struct fuse_entry_out *feo; 1416 struct componentname *cnp; 1417 uint64_t nid; 1418 __enum_uint8(vtype) vtyp; 1419 }; 1420 1421 /* Callback for vn_get_ino */ 1422 static int 1423 fuse_lookup_alloc(struct mount *mp, void *arg, int lkflags, struct vnode **vpp) 1424 { 1425 struct fuse_lookup_alloc_arg *flaa = arg; 1426 1427 return fuse_vnode_get(mp, flaa->feo, flaa->nid, NULL, vpp, flaa->cnp, 1428 flaa->vtyp); 1429 } 1430 1431 SDT_PROBE_DEFINE3(fusefs, , vnops, cache_lookup, 1432 "int", "struct timespec*", "struct timespec*"); 1433 /* 1434 struct vnop_lookup_args { 1435 struct vnodeop_desc *a_desc; 1436 struct vnode *a_dvp; 1437 struct vnode **a_vpp; 1438 struct componentname *a_cnp; 1439 }; 1440 */ 1441 int 1442 fuse_vnop_lookup(struct vop_lookup_args *ap) 1443 { 1444 struct vnode *dvp = ap->a_dvp; 1445 struct vnode **vpp = ap->a_vpp; 1446 struct componentname *cnp = ap->a_cnp; 1447 struct thread *td = curthread; 1448 struct ucred *cred = cnp->cn_cred; 1449 struct timespec now; 1450 1451 int nameiop = cnp->cn_nameiop; 1452 bool isdotdot = cnp->cn_flags & ISDOTDOT; 1453 bool islastcn = cnp->cn_flags & ISLASTCN; 1454 struct mount *mp = vnode_mount(dvp); 1455 struct fuse_data *data = fuse_get_mpdata(mp); 1456 int default_permissions = data->dataflags & FSESS_DEFAULT_PERMISSIONS; 1457 bool is_dot; 1458 1459 int err = 0; 1460 int lookup_err = 0; 1461 struct vnode *vp = NULL; 1462 1463 struct fuse_dispatcher fdi; 1464 bool did_lookup = false; 1465 struct fuse_entry_out *feo = NULL; 1466 __enum_uint8(vtype) vtyp; /* vnode type of target */ 1467 1468 uint64_t nid; 1469 1470 if (fuse_isdeadfs(dvp)) { 1471 *vpp = NULL; 1472 return (EXTERROR(ENXIO, "This FUSE session is about " 1473 "to be closed")); 1474 } 1475 if (!vnode_isdir(dvp)) 1476 return ENOTDIR; 1477 1478 if (islastcn && vfs_isrdonly(mp) && (nameiop != LOOKUP)) 1479 return EROFS; 1480 1481 if ((cnp->cn_flags & NOEXECCHECK) != 0) 1482 cnp->cn_flags &= ~NOEXECCHECK; 1483 else if ((err = fuse_internal_access(dvp, VEXEC, td, cred))) 1484 return err; 1485 1486 is_dot = cnp->cn_namelen == 1 && *(cnp->cn_nameptr) == '.'; 1487 if (isdotdot && !(data->dataflags & FSESS_EXPORT_SUPPORT)) { 1488 if (!(VTOFUD(dvp)->flag & FN_PARENT_NID)) { 1489 /* 1490 * Since the file system doesn't support ".." lookups, 1491 * we have no way to find this entry. 1492 */ 1493 return (EXTERROR(ESTALE, "This server does not support " 1494 "'..' lookups")); 1495 } 1496 nid = VTOFUD(dvp)->parent_nid; 1497 if (nid == 0) 1498 return ENOENT; 1499 /* .. is obviously a directory */ 1500 vtyp = VDIR; 1501 } else if (is_dot) { 1502 nid = VTOI(dvp); 1503 /* . is obviously a directory */ 1504 vtyp = VDIR; 1505 } else { 1506 struct timespec timeout; 1507 int ncpticks; /* here to accommodate for API contract */ 1508 1509 err = cache_lookup(dvp, vpp, cnp, &timeout, &ncpticks); 1510 getnanouptime(&now); 1511 SDT_PROBE3(fusefs, , vnops, cache_lookup, err, &timeout, &now); 1512 switch (err) { 1513 case -1: /* positive match */ 1514 if (timespeccmp(&timeout, &now, >)) { 1515 counter_u64_add(fuse_lookup_cache_hits, 1); 1516 } else { 1517 /* Cache timeout */ 1518 counter_u64_add(fuse_lookup_cache_misses, 1); 1519 bintime_clear( 1520 &VTOFUD(*vpp)->entry_cache_timeout); 1521 cache_purge(*vpp); 1522 if (dvp != *vpp) 1523 vput(*vpp); 1524 else 1525 vrele(*vpp); 1526 *vpp = NULL; 1527 break; 1528 } 1529 return 0; 1530 1531 case 0: /* no match in cache */ 1532 counter_u64_add(fuse_lookup_cache_misses, 1); 1533 break; 1534 1535 case ENOENT: /* negative match */ 1536 if (timespeccmp(&timeout, &now, <=)) { 1537 /* Cache timeout */ 1538 cache_purge_negative(dvp); 1539 break; 1540 } 1541 /* fall through */ 1542 default: 1543 return err; 1544 } 1545 1546 fdisp_init(&fdi, cnp->cn_namelen + 1); 1547 fdisp_make(&fdi, FUSE_LOOKUP, mp, VTOI(dvp), td, cred); 1548 1549 memcpy(fdi.indata, cnp->cn_nameptr, cnp->cn_namelen); 1550 ((char *)fdi.indata)[cnp->cn_namelen] = '\0'; 1551 lookup_err = fdisp_wait_answ(&fdi); 1552 did_lookup = true; 1553 1554 if (!lookup_err) { 1555 /* lookup call succeeded */ 1556 feo = (struct fuse_entry_out *)fdi.answ; 1557 nid = feo->nodeid; 1558 if (nid == 0) { 1559 /* zero nodeid means ENOENT and cache it */ 1560 struct timespec timeout; 1561 1562 fdi.answ_stat = ENOENT; 1563 lookup_err = ENOENT; 1564 if (cnp->cn_flags & MAKEENTRY) { 1565 fuse_validity_2_timespec(feo, &timeout); 1566 /* Use the same entry_time for .. as for 1567 * the file itself. That doesn't honor 1568 * exactly what the fuse server tells 1569 * us, but to do otherwise would require 1570 * another cache lookup at this point. 1571 */ 1572 struct timespec *dtsp = NULL; 1573 cache_enter_time(dvp, *vpp, cnp, 1574 &timeout, dtsp); 1575 } 1576 } 1577 vtyp = IFTOVT(feo->attr.mode); 1578 } 1579 if (lookup_err && (!fdi.answ_stat || lookup_err != ENOENT)) { 1580 fdisp_destroy(&fdi); 1581 return lookup_err; 1582 } 1583 } 1584 /* lookup_err, if non-zero, must be ENOENT at this point */ 1585 1586 if (lookup_err) { 1587 /* Entry not found */ 1588 if ((nameiop == CREATE || nameiop == RENAME) && islastcn) { 1589 if (default_permissions) 1590 err = fuse_internal_access(dvp, VWRITE, td, 1591 cred); 1592 else 1593 err = 0; 1594 if (!err) { 1595 err = EJUSTRETURN; 1596 } 1597 } else { 1598 err = ENOENT; 1599 } 1600 } else { 1601 /* Entry was found */ 1602 if (isdotdot) { 1603 struct fuse_lookup_alloc_arg flaa; 1604 1605 flaa.nid = nid; 1606 flaa.feo = feo; 1607 flaa.cnp = cnp; 1608 flaa.vtyp = vtyp; 1609 err = vn_vget_ino_gen(dvp, fuse_lookup_alloc, &flaa, 0, 1610 &vp); 1611 *vpp = vp; 1612 } else if (nid == VTOI(dvp)) { 1613 if (is_dot) { 1614 vref(dvp); 1615 *vpp = dvp; 1616 } else { 1617 static const char exterr[] = "Server assigned " 1618 "same inode to both parent and child."; 1619 fuse_warn(fuse_get_mpdata(mp), 1620 FSESS_WARN_ILLEGAL_INODE, exterr); 1621 err = EXTERROR(EIO, exterr); 1622 } 1623 1624 } else { 1625 struct fuse_vnode_data *fvdat; 1626 1627 err = fuse_vnode_get(vnode_mount(dvp), feo, nid, dvp, 1628 &vp, cnp, vtyp); 1629 if (err) 1630 goto out; 1631 *vpp = vp; 1632 fvdat = VTOFUD(vp); 1633 1634 MPASS(feo != NULL); 1635 if (timespeccmp(&now, &fvdat->last_local_modify, >)) { 1636 /* 1637 * Attributes from the server are definitely 1638 * newer than the last attributes we sent to 1639 * the server, so cache them. 1640 */ 1641 fuse_internal_cache_attrs(*vpp, &feo->attr, 1642 feo->attr_valid, feo->attr_valid_nsec, 1643 NULL, true); 1644 } 1645 fuse_validity_2_bintime(feo->entry_valid, 1646 feo->entry_valid_nsec, 1647 &fvdat->entry_cache_timeout); 1648 1649 if ((nameiop == DELETE || nameiop == RENAME) && 1650 islastcn && default_permissions) 1651 { 1652 struct vattr dvattr; 1653 1654 err = fuse_internal_access(dvp, VWRITE, td, 1655 cred); 1656 if (err != 0) 1657 goto out; 1658 /* 1659 * if the parent's sticky bit is set, check 1660 * whether we're allowed to remove the file. 1661 * Need to figure out the vnode locking to make 1662 * this work. 1663 */ 1664 fuse_internal_getattr(dvp, &dvattr, cred, td); 1665 if ((dvattr.va_mode & S_ISTXT) && 1666 fuse_internal_access(dvp, VADMIN, td, 1667 cred) && 1668 fuse_internal_access(*vpp, VADMIN, td, 1669 cred)) { 1670 err = EPERM; 1671 goto out; 1672 } 1673 } 1674 } 1675 } 1676 out: 1677 if (err) { 1678 if (vp != NULL && dvp != vp) 1679 vput(vp); 1680 else if (vp != NULL) 1681 vrele(vp); 1682 *vpp = NULL; 1683 } 1684 if (did_lookup) 1685 fdisp_destroy(&fdi); 1686 1687 return err; 1688 } 1689 1690 /* 1691 struct vnop_mkdir_args { 1692 struct vnode *a_dvp; 1693 struct vnode **a_vpp; 1694 struct componentname *a_cnp; 1695 struct vattr *a_vap; 1696 }; 1697 */ 1698 static int 1699 fuse_vnop_mkdir(struct vop_mkdir_args *ap) 1700 { 1701 struct vnode *dvp = ap->a_dvp; 1702 struct vnode **vpp = ap->a_vpp; 1703 struct componentname *cnp = ap->a_cnp; 1704 struct vattr *vap = ap->a_vap; 1705 1706 struct fuse_mkdir_in fmdi; 1707 1708 if (fuse_isdeadfs(dvp)) { 1709 return (EXTERROR(ENXIO, "This FUSE session is about " 1710 "to be closed")); 1711 } 1712 fmdi.mode = MAKEIMODE(vap->va_type, vap->va_mode); 1713 fmdi.umask = curthread->td_proc->p_pd->pd_cmask; 1714 1715 return (fuse_internal_newentry(dvp, vpp, cnp, FUSE_MKDIR, &fmdi, 1716 sizeof(fmdi), VDIR)); 1717 } 1718 1719 /* 1720 struct vnop_mknod_args { 1721 struct vnode *a_dvp; 1722 struct vnode **a_vpp; 1723 struct componentname *a_cnp; 1724 struct vattr *a_vap; 1725 }; 1726 */ 1727 static int 1728 fuse_vnop_mknod(struct vop_mknod_args *ap) 1729 { 1730 1731 struct vnode *dvp = ap->a_dvp; 1732 struct vnode **vpp = ap->a_vpp; 1733 struct componentname *cnp = ap->a_cnp; 1734 struct vattr *vap = ap->a_vap; 1735 1736 if (fuse_isdeadfs(dvp)) 1737 return (EXTERROR(ENXIO, "This FUSE session is about " 1738 "to be closed")); 1739 1740 return fuse_internal_mknod(dvp, vpp, cnp, vap); 1741 } 1742 1743 /* 1744 struct vop_open_args { 1745 struct vnode *a_vp; 1746 int a_mode; 1747 struct ucred *a_cred; 1748 struct thread *a_td; 1749 int a_fdidx; / struct file *a_fp; 1750 }; 1751 */ 1752 static int 1753 fuse_vnop_open(struct vop_open_args *ap) 1754 { 1755 struct vnode *vp = ap->a_vp; 1756 int a_mode = ap->a_mode; 1757 struct thread *td = ap->a_td; 1758 struct ucred *cred = ap->a_cred; 1759 pid_t pid = td->td_proc->p_pid; 1760 1761 if (fuse_isdeadfs(vp)) 1762 return (EXTERROR(ENXIO, "This FUSE session is about " 1763 "to be closed")); 1764 if (vp->v_type == VCHR || vp->v_type == VBLK || vp->v_type == VFIFO) 1765 return (EXTERROR(EOPNOTSUPP, "Unsupported vnode type", 1766 vp->v_type)); 1767 if ((a_mode & (FREAD | FWRITE | FEXEC)) == 0) 1768 return (EXTERROR(EINVAL, "Illegal mode", a_mode)); 1769 1770 if (fuse_filehandle_validrw(vp, a_mode, cred, pid)) { 1771 fuse_vnode_open(vp, 0, td); 1772 return 0; 1773 } 1774 1775 return fuse_filehandle_open(vp, a_mode, NULL, td, cred); 1776 } 1777 1778 static int 1779 fuse_vnop_pathconf(struct vop_pathconf_args *ap) 1780 { 1781 struct vnode *vp = ap->a_vp; 1782 struct mount *mp; 1783 struct fuse_filehandle *fufh; 1784 int err; 1785 bool closefufh = false; 1786 1787 switch (ap->a_name) { 1788 case _PC_FILESIZEBITS: 1789 *ap->a_retval = 64; 1790 return (0); 1791 case _PC_NAME_MAX: 1792 *ap->a_retval = NAME_MAX; 1793 return (0); 1794 case _PC_LINK_MAX: 1795 *ap->a_retval = MIN(LONG_MAX, FUSE_LINK_MAX); 1796 return (0); 1797 case _PC_SYMLINK_MAX: 1798 *ap->a_retval = MAXPATHLEN; 1799 return (0); 1800 case _PC_NO_TRUNC: 1801 *ap->a_retval = 1; 1802 return (0); 1803 case _PC_MIN_HOLE_SIZE: 1804 /* 1805 * The FUSE protocol provides no mechanism for a server to 1806 * report _PC_MIN_HOLE_SIZE. It's a protocol bug. Instead, 1807 * return EINVAL if the server does not support FUSE_LSEEK, or 1808 * 1 if it does. 1809 */ 1810 mp = vnode_mount(vp); 1811 if (!fsess_is_impl(mp, FUSE_LSEEK) && 1812 !fsess_not_impl(mp, FUSE_LSEEK)) { 1813 off_t offset = 0; 1814 1815 /* 1816 * Issue a FUSE_LSEEK to find out if it's supported. 1817 * Use SEEK_DATA instead of SEEK_HOLE, because the 1818 * latter generally requires sequential scans of file 1819 * metadata, which can be slow. 1820 */ 1821 err = fuse_vnop_do_lseek(vp, curthread, 1822 curthread->td_ucred, curthread->td_proc->p_pid, 1823 &offset, SEEK_DATA); 1824 if (err == EBADF) { 1825 /* 1826 * pathconf() doesn't necessarily open the 1827 * file. So we may need to do it here. 1828 */ 1829 err = fuse_filehandle_open(vp, FREAD, &fufh, 1830 curthread, curthread->td_ucred); 1831 if (err == 0) { 1832 closefufh = true; 1833 err = fuse_vnop_do_lseek(vp, curthread, 1834 curthread->td_ucred, 1835 curthread->td_proc->p_pid, &offset, 1836 SEEK_DATA); 1837 } 1838 if (closefufh) 1839 fuse_filehandle_close(vp, fufh, 1840 curthread, curthread->td_ucred); 1841 } 1842 1843 } 1844 1845 if (fsess_is_impl(mp, FUSE_LSEEK)) { 1846 *ap->a_retval = 1; 1847 return (0); 1848 } else if (fsess_not_impl(mp, FUSE_LSEEK)) { 1849 /* FUSE_LSEEK is not implemented */ 1850 return (EXTERROR(EINVAL, "This server does not " 1851 "implement FUSE_LSEEK")); 1852 } else { 1853 return (err); 1854 } 1855 default: 1856 return (vop_stdpathconf(ap)); 1857 } 1858 } 1859 1860 SDT_PROBE_DEFINE3(fusefs, , vnops, filehandles_closed, "struct vnode*", 1861 "struct uio*", "struct ucred*"); 1862 /* 1863 struct vnop_read_args { 1864 struct vnode *a_vp; 1865 struct uio *a_uio; 1866 int a_ioflag; 1867 struct ucred *a_cred; 1868 }; 1869 */ 1870 static int 1871 fuse_vnop_read(struct vop_read_args *ap) 1872 { 1873 struct vnode *vp = ap->a_vp; 1874 struct uio *uio = ap->a_uio; 1875 int ioflag = ap->a_ioflag; 1876 struct ucred *cred = ap->a_cred; 1877 pid_t pid = curthread->td_proc->p_pid; 1878 struct fuse_filehandle *fufh; 1879 int err; 1880 bool closefufh = false, directio; 1881 1882 MPASS(vp->v_type == VREG || vp->v_type == VDIR); 1883 1884 if (fuse_isdeadfs(vp)) { 1885 return (EXTERROR(ENXIO, "This FUSE session is about " 1886 "to be closed")); 1887 } 1888 1889 if (VTOFUD(vp)->flag & FN_DIRECTIO) { 1890 ioflag |= IO_DIRECT; 1891 } 1892 1893 err = fuse_filehandle_getrw(vp, FREAD, &fufh, cred, pid); 1894 if (err == EBADF && vnode_mount(vp)->mnt_flag & MNT_EXPORTED) { 1895 /* 1896 * nfsd will do I/O without first doing VOP_OPEN. We 1897 * must implicitly open the file here 1898 */ 1899 err = fuse_filehandle_open(vp, FREAD, &fufh, curthread, cred); 1900 closefufh = true; 1901 } 1902 if (err) { 1903 SDT_PROBE3(fusefs, , vnops, filehandles_closed, vp, uio, cred); 1904 return err; 1905 } 1906 1907 /* 1908 * Ideally, when the daemon asks for direct io at open time, the 1909 * standard file flag should be set according to this, so that would 1910 * just change the default mode, which later on could be changed via 1911 * fcntl(2). 1912 * But this doesn't work, the O_DIRECT flag gets cleared at some point 1913 * (don't know where). So to make any use of the Fuse direct_io option, 1914 * we hardwire it into the file's private data (similarly to Linux, 1915 * btw.). 1916 */ 1917 directio = (ioflag & IO_DIRECT) || !fsess_opt_datacache(vnode_mount(vp)); 1918 1919 fuse_vnode_update(vp, FN_ATIMECHANGE); 1920 if (directio) { 1921 SDT_PROBE2(fusefs, , vnops, trace, 1, "direct read of vnode"); 1922 err = fuse_read_directbackend(vp, uio, cred, fufh); 1923 } else { 1924 SDT_PROBE2(fusefs, , vnops, trace, 1, "buffered read of vnode"); 1925 err = fuse_read_biobackend(vp, uio, ioflag, cred, fufh, pid); 1926 } 1927 1928 if (closefufh) 1929 fuse_filehandle_close(vp, fufh, curthread, cred); 1930 1931 return (err); 1932 } 1933 1934 /* 1935 struct vnop_readdir_args { 1936 struct vnode *a_vp; 1937 struct uio *a_uio; 1938 struct ucred *a_cred; 1939 int *a_eofflag; 1940 int *a_ncookies; 1941 uint64_t **a_cookies; 1942 }; 1943 */ 1944 static int 1945 fuse_vnop_readdir(struct vop_readdir_args *ap) 1946 { 1947 struct vnode *vp = ap->a_vp; 1948 struct uio *uio = ap->a_uio; 1949 struct ucred *cred = ap->a_cred; 1950 struct fuse_filehandle *fufh = NULL; 1951 struct mount *mp = vnode_mount(vp); 1952 struct fuse_iov cookediov; 1953 int err = 0; 1954 uint64_t *cookies; 1955 ssize_t tresid; 1956 int ncookies; 1957 bool closefufh = false; 1958 pid_t pid = curthread->td_proc->p_pid; 1959 1960 if (ap->a_eofflag) 1961 *ap->a_eofflag = 0; 1962 if (fuse_isdeadfs(vp)) { 1963 return (EXTERROR(ENXIO, "This FUSE session is about " 1964 "to be closed")); 1965 } 1966 if (uio_resid(uio) < sizeof(struct dirent)) 1967 return (EXTERROR(EINVAL, "Buffer is too small")); 1968 1969 tresid = uio->uio_resid; 1970 err = fuse_filehandle_get_dir(vp, &fufh, cred, pid); 1971 if (err == EBADF && mp->mnt_flag & MNT_EXPORTED) { 1972 KASSERT(!fsess_is_impl(mp, FUSE_OPENDIR), 1973 ("FUSE file systems that implement " 1974 "FUSE_OPENDIR should not be exported")); 1975 /* 1976 * nfsd will do VOP_READDIR without first doing VOP_OPEN. We 1977 * must implicitly open the directory here. 1978 */ 1979 err = fuse_filehandle_open(vp, FREAD, &fufh, curthread, cred); 1980 closefufh = true; 1981 } 1982 if (err) 1983 return (err); 1984 if (ap->a_ncookies != NULL) { 1985 ncookies = uio->uio_resid / 1986 (offsetof(struct dirent, d_name) + 4) + 1; 1987 cookies = malloc(ncookies * sizeof(*cookies), M_TEMP, M_WAITOK); 1988 *ap->a_ncookies = ncookies; 1989 *ap->a_cookies = cookies; 1990 } else { 1991 ncookies = 0; 1992 cookies = NULL; 1993 } 1994 #define DIRCOOKEDSIZE FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + MAXNAMLEN + 1) 1995 fiov_init(&cookediov, DIRCOOKEDSIZE); 1996 1997 err = fuse_internal_readdir(vp, uio, fufh, &cookediov, 1998 &ncookies, cookies); 1999 2000 fiov_teardown(&cookediov); 2001 if (closefufh) 2002 fuse_filehandle_close(vp, fufh, curthread, cred); 2003 2004 if (ap->a_ncookies != NULL) { 2005 if (err == 0) { 2006 *ap->a_ncookies -= ncookies; 2007 } else { 2008 free(*ap->a_cookies, M_TEMP); 2009 *ap->a_ncookies = 0; 2010 *ap->a_cookies = NULL; 2011 } 2012 } 2013 if (err == 0 && tresid == uio->uio_resid) 2014 *ap->a_eofflag = 1; 2015 2016 return err; 2017 } 2018 2019 /* 2020 struct vnop_readlink_args { 2021 struct vnode *a_vp; 2022 struct uio *a_uio; 2023 struct ucred *a_cred; 2024 }; 2025 */ 2026 static int 2027 fuse_vnop_readlink(struct vop_readlink_args *ap) 2028 { 2029 struct vnode *vp = ap->a_vp; 2030 struct uio *uio = ap->a_uio; 2031 struct ucred *cred = ap->a_cred; 2032 2033 struct fuse_dispatcher fdi; 2034 int err; 2035 2036 if (fuse_isdeadfs(vp)) { 2037 return (EXTERROR(ENXIO, "This FUSE session is about " 2038 "to be closed")); 2039 } 2040 if (!vnode_islnk(vp)) { 2041 return EINVAL; 2042 } 2043 fdisp_init(&fdi, 0); 2044 err = fdisp_simple_putget_vp(&fdi, FUSE_READLINK, vp, curthread, cred); 2045 if (err) { 2046 goto out; 2047 } 2048 if (strnlen(fdi.answ, fdi.iosize) + 1 < fdi.iosize) { 2049 static const char exterr[] = "Server returned an embedded NUL " 2050 "from FUSE_READLINK."; 2051 struct fuse_data *data = fuse_get_mpdata(vnode_mount(vp)); 2052 fuse_warn(data, FSESS_WARN_READLINK_EMBEDDED_NUL, exterr); 2053 err = EXTERROR(EIO, exterr); 2054 goto out; 2055 } 2056 if (((char *)fdi.answ)[0] == '/' && 2057 fuse_get_mpdata(vnode_mount(vp))->dataflags & FSESS_PUSH_SYMLINKS_IN) { 2058 char *mpth = vnode_mount(vp)->mnt_stat.f_mntonname; 2059 2060 err = uiomove(mpth, strlen(mpth), uio); 2061 } 2062 if (!err) { 2063 err = uiomove(fdi.answ, fdi.iosize, uio); 2064 } 2065 out: 2066 fdisp_destroy(&fdi); 2067 return err; 2068 } 2069 2070 /* 2071 struct vnop_reclaim_args { 2072 struct vnode *a_vp; 2073 }; 2074 */ 2075 static int 2076 fuse_vnop_reclaim(struct vop_reclaim_args *ap) 2077 { 2078 struct vnode *vp = ap->a_vp; 2079 struct thread *td = curthread; 2080 struct fuse_vnode_data *fvdat = VTOFUD(vp); 2081 struct fuse_filehandle *fufh, *fufh_tmp; 2082 2083 if (!fvdat) { 2084 panic("FUSE: no vnode data during recycling"); 2085 } 2086 LIST_FOREACH_SAFE(fufh, &fvdat->handles, next, fufh_tmp) { 2087 printf("FUSE: vnode being reclaimed with open fufh " 2088 "(type=%#x)", fufh->fufh_type); 2089 fuse_filehandle_close(vp, fufh, td, NULL); 2090 } 2091 2092 if (VTOI(vp) == 1) { 2093 /* 2094 * Don't send FUSE_FORGET for the root inode, because 2095 * we never send FUSE_LOOKUP for it (see 2096 * fuse_vfsop_root) and we don't want the server to see 2097 * mismatched lookup counts. 2098 */ 2099 struct fuse_data *data; 2100 struct vnode *vroot; 2101 2102 data = fuse_get_mpdata(vnode_mount(vp)); 2103 FUSE_LOCK(); 2104 vroot = data->vroot; 2105 data->vroot = NULL; 2106 FUSE_UNLOCK(); 2107 if (vroot) 2108 vrele(vroot); 2109 } else if (!fuse_isdeadfs(vp) && fvdat->nlookup > 0) { 2110 fuse_internal_forget_send(vnode_mount(vp), td, NULL, VTOI(vp), 2111 fvdat->nlookup); 2112 } 2113 cache_purge(vp); 2114 vfs_hash_remove(vp); 2115 fuse_vnode_destroy(vp); 2116 2117 return 0; 2118 } 2119 2120 /* 2121 struct vnop_remove_args { 2122 struct vnode *a_dvp; 2123 struct vnode *a_vp; 2124 struct componentname *a_cnp; 2125 }; 2126 */ 2127 static int 2128 fuse_vnop_remove(struct vop_remove_args *ap) 2129 { 2130 struct vnode *dvp = ap->a_dvp; 2131 struct vnode *vp = ap->a_vp; 2132 struct componentname *cnp = ap->a_cnp; 2133 2134 int err; 2135 2136 if (fuse_isdeadfs(vp)) { 2137 return (EXTERROR(ENXIO, "This FUSE session is about " 2138 "to be closed")); 2139 } 2140 if (vnode_isdir(vp)) { 2141 return (EXTERROR(EPERM, "vnode is a directory")); 2142 } 2143 2144 err = fuse_internal_remove(dvp, vp, cnp, FUSE_UNLINK); 2145 2146 return err; 2147 } 2148 2149 /* 2150 struct vnop_rename_args { 2151 struct vnode *a_fdvp; 2152 struct vnode *a_fvp; 2153 struct componentname *a_fcnp; 2154 struct vnode *a_tdvp; 2155 struct vnode *a_tvp; 2156 struct componentname *a_tcnp; 2157 }; 2158 */ 2159 static int 2160 fuse_vnop_rename(struct vop_rename_args *ap) 2161 { 2162 struct vnode *fdvp = ap->a_fdvp; 2163 struct vnode *fvp = ap->a_fvp; 2164 struct componentname *fcnp = ap->a_fcnp; 2165 struct vnode *tdvp = ap->a_tdvp; 2166 struct vnode *tvp = ap->a_tvp; 2167 struct componentname *tcnp = ap->a_tcnp; 2168 struct fuse_data *data; 2169 bool newparent = fdvp != tdvp; 2170 bool isdir = fvp->v_type == VDIR; 2171 int err = 0; 2172 2173 if (fuse_isdeadfs(fdvp)) { 2174 return (EXTERROR(ENXIO, "This FUSE session is about " 2175 "to be closed")); 2176 } 2177 if (fvp->v_mount != tdvp->v_mount || 2178 (tvp && fvp->v_mount != tvp->v_mount)) { 2179 SDT_PROBE2(fusefs, , vnops, trace, 1, "cross-device rename"); 2180 err = EXTERROR(EXDEV, "Cross-device rename"); 2181 goto out; 2182 } 2183 cache_purge(fvp); 2184 2185 /* 2186 * FUSE library is expected to check if target directory is not 2187 * under the source directory in the file system tree. 2188 * Linux performs this check at VFS level. 2189 */ 2190 /* 2191 * If source is a directory, and it will get a new parent, user must 2192 * have write permission to it, so ".." can be modified. 2193 */ 2194 data = fuse_get_mpdata(vnode_mount(tdvp)); 2195 if (data->dataflags & FSESS_DEFAULT_PERMISSIONS && isdir && newparent) { 2196 err = fuse_internal_access(fvp, VWRITE, 2197 curthread, tcnp->cn_cred); 2198 if (err) 2199 goto out; 2200 } 2201 sx_xlock(&data->rename_lock); 2202 err = fuse_internal_rename(fdvp, fcnp, tdvp, tcnp); 2203 if (err == 0) { 2204 if (tdvp != fdvp) 2205 fuse_vnode_setparent(fvp, tdvp); 2206 if (tvp != NULL) 2207 fuse_vnode_setparent(tvp, NULL); 2208 } 2209 sx_unlock(&data->rename_lock); 2210 2211 if (tvp != NULL && tvp != fvp) { 2212 cache_purge(tvp); 2213 } 2214 if (vnode_isdir(fvp)) { 2215 if (((tvp != NULL) && vnode_isdir(tvp)) || vnode_isdir(fvp)) { 2216 cache_purge(tdvp); 2217 } 2218 cache_purge(fdvp); 2219 } 2220 out: 2221 if (tdvp == tvp) { 2222 vrele(tdvp); 2223 } else { 2224 vput(tdvp); 2225 } 2226 if (tvp != NULL) { 2227 vput(tvp); 2228 } 2229 vrele(fdvp); 2230 vrele(fvp); 2231 2232 return err; 2233 } 2234 2235 /* 2236 struct vnop_rmdir_args { 2237 struct vnode *a_dvp; 2238 struct vnode *a_vp; 2239 struct componentname *a_cnp; 2240 } *ap; 2241 */ 2242 static int 2243 fuse_vnop_rmdir(struct vop_rmdir_args *ap) 2244 { 2245 struct vnode *dvp = ap->a_dvp; 2246 struct vnode *vp = ap->a_vp; 2247 2248 int err; 2249 2250 if (fuse_isdeadfs(vp)) { 2251 return (EXTERROR(ENXIO, "This FUSE session is about " 2252 "to be closed")); 2253 } 2254 if (VTOFUD(vp) == VTOFUD(dvp)) { 2255 return (EXTERROR(EINVAL, "Directory to be removed " 2256 "contains itself")); 2257 } 2258 err = fuse_internal_remove(dvp, vp, ap->a_cnp, FUSE_RMDIR); 2259 2260 return err; 2261 } 2262 2263 /* 2264 struct vnop_setattr_args { 2265 struct vnode *a_vp; 2266 struct vattr *a_vap; 2267 struct ucred *a_cred; 2268 struct thread *a_td; 2269 }; 2270 */ 2271 static int 2272 fuse_vnop_setattr(struct vop_setattr_args *ap) 2273 { 2274 struct vnode *vp = ap->a_vp; 2275 struct vattr *vap = ap->a_vap; 2276 struct ucred *cred = ap->a_cred; 2277 struct thread *td = curthread; 2278 struct mount *mp; 2279 struct fuse_data *data; 2280 struct vattr old_va; 2281 int dataflags; 2282 int err = 0, err2; 2283 accmode_t accmode = 0; 2284 bool checkperm; 2285 bool drop_suid = false; 2286 2287 mp = vnode_mount(vp); 2288 data = fuse_get_mpdata(mp); 2289 dataflags = data->dataflags; 2290 checkperm = dataflags & FSESS_DEFAULT_PERMISSIONS; 2291 2292 if (fuse_isdeadfs(vp)) { 2293 return (EXTERROR(ENXIO, "This FUSE session is about " 2294 "to be closed")); 2295 } 2296 2297 if (vap->va_uid != (uid_t)VNOVAL) { 2298 if (checkperm) { 2299 /* Only root may change a file's owner */ 2300 err = priv_check_cred(cred, PRIV_VFS_CHOWN); 2301 if (err) { 2302 /* As a special case, allow the null chown */ 2303 err2 = fuse_internal_getattr(vp, &old_va, cred, 2304 td); 2305 if (err2) 2306 return (err2); 2307 if (vap->va_uid != old_va.va_uid) 2308 return err; 2309 drop_suid = true; 2310 } 2311 } 2312 accmode |= VADMIN; 2313 } 2314 if (vap->va_gid != (gid_t)VNOVAL) { 2315 if (checkperm && priv_check_cred(cred, PRIV_VFS_CHOWN)) 2316 drop_suid = true; 2317 if (checkperm && !groupmember(vap->va_gid, cred)) { 2318 /* 2319 * Non-root users may only chgrp to one of their own 2320 * groups 2321 */ 2322 err = priv_check_cred(cred, PRIV_VFS_CHOWN); 2323 if (err) { 2324 /* As a special case, allow the null chgrp */ 2325 err2 = fuse_internal_getattr(vp, &old_va, cred, 2326 td); 2327 if (err2) 2328 return (err2); 2329 if (vap->va_gid != old_va.va_gid) 2330 return err; 2331 } 2332 } 2333 accmode |= VADMIN; 2334 } 2335 if (vap->va_size != VNOVAL) { 2336 switch (vp->v_type) { 2337 case VDIR: 2338 return (EISDIR); 2339 case VLNK: 2340 case VREG: 2341 if (vfs_isrdonly(mp)) 2342 return (EROFS); 2343 err = vn_rlimit_trunc(vap->va_size, td); 2344 if (err) 2345 return (err); 2346 break; 2347 default: 2348 /* 2349 * According to POSIX, the result is unspecified 2350 * for file types other than regular files, 2351 * directories and shared memory objects. We 2352 * don't support shared memory objects in the file 2353 * system, and have dubious support for truncating 2354 * symlinks. Just ignore the request in other cases. 2355 */ 2356 return (0); 2357 } 2358 /* Don't set accmode. Permission to trunc is checked upstack */ 2359 } 2360 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 2361 if (vap->va_vaflags & VA_UTIMES_NULL) 2362 accmode |= VWRITE; 2363 else 2364 accmode |= VADMIN; 2365 } 2366 if (drop_suid) { 2367 if (vap->va_mode != (mode_t)VNOVAL) 2368 vap->va_mode &= ~(S_ISUID | S_ISGID); 2369 else { 2370 err = fuse_internal_getattr(vp, &old_va, cred, td); 2371 if (err) 2372 return (err); 2373 vap->va_mode = old_va.va_mode & ~(S_ISUID | S_ISGID); 2374 } 2375 } 2376 if (vap->va_mode != (mode_t)VNOVAL) { 2377 /* Only root may set the sticky bit on non-directories */ 2378 if (checkperm && vp->v_type != VDIR && (vap->va_mode & S_ISTXT) 2379 && priv_check_cred(cred, PRIV_VFS_STICKYFILE)) 2380 return EFTYPE; 2381 if (checkperm && (vap->va_mode & S_ISGID)) { 2382 err = fuse_internal_getattr(vp, &old_va, cred, td); 2383 if (err) 2384 return (err); 2385 if (!groupmember(old_va.va_gid, cred)) { 2386 err = priv_check_cred(cred, PRIV_VFS_SETGID); 2387 if (err) 2388 return (err); 2389 } 2390 } 2391 accmode |= VADMIN; 2392 } 2393 2394 if (vfs_isrdonly(mp)) 2395 return EROFS; 2396 2397 if (checkperm) { 2398 err = fuse_internal_access(vp, accmode, td, cred); 2399 } else { 2400 err = 0; 2401 } 2402 if (err) 2403 return err; 2404 else 2405 return fuse_internal_setattr(vp, vap, td, cred); 2406 } 2407 2408 /* 2409 struct vnop_strategy_args { 2410 struct vnode *a_vp; 2411 struct buf *a_bp; 2412 }; 2413 */ 2414 static int 2415 fuse_vnop_strategy(struct vop_strategy_args *ap) 2416 { 2417 struct vnode *vp = ap->a_vp; 2418 struct buf *bp = ap->a_bp; 2419 2420 if (!vp || fuse_isdeadfs(vp)) { 2421 bp->b_ioflags |= BIO_ERROR; 2422 bp->b_error = ENXIO; 2423 bufdone(bp); 2424 return 0; 2425 } 2426 2427 /* 2428 * VOP_STRATEGY always returns zero and signals error via bp->b_ioflags. 2429 * fuse_io_strategy sets bp's error fields 2430 */ 2431 (void)fuse_io_strategy(vp, bp); 2432 2433 return 0; 2434 } 2435 2436 /* 2437 struct vnop_symlink_args { 2438 struct vnode *a_dvp; 2439 struct vnode **a_vpp; 2440 struct componentname *a_cnp; 2441 struct vattr *a_vap; 2442 char *a_target; 2443 }; 2444 */ 2445 static int 2446 fuse_vnop_symlink(struct vop_symlink_args *ap) 2447 { 2448 struct vnode *dvp = ap->a_dvp; 2449 struct vnode **vpp = ap->a_vpp; 2450 struct componentname *cnp = ap->a_cnp; 2451 const char *target = ap->a_target; 2452 2453 struct fuse_dispatcher fdi; 2454 2455 int err; 2456 size_t len; 2457 2458 if (fuse_isdeadfs(dvp)) { 2459 return (EXTERROR(ENXIO, "This FUSE session is about " 2460 "to be closed")); 2461 } 2462 /* 2463 * Unlike the other creator type calls, here we have to create a message 2464 * where the name of the new entry comes first, and the data describing 2465 * the entry comes second. 2466 * Hence we can't rely on our handy fuse_internal_newentry() routine, 2467 * but put together the message manually and just call the core part. 2468 */ 2469 2470 len = strlen(target) + 1; 2471 fdisp_init(&fdi, len + cnp->cn_namelen + 1); 2472 fdisp_make_vp(&fdi, FUSE_SYMLINK, dvp, curthread, NULL); 2473 2474 memcpy(fdi.indata, cnp->cn_nameptr, cnp->cn_namelen); 2475 ((char *)fdi.indata)[cnp->cn_namelen] = '\0'; 2476 memcpy((char *)fdi.indata + cnp->cn_namelen + 1, target, len); 2477 2478 err = fuse_internal_newentry_core(dvp, vpp, cnp, VLNK, &fdi); 2479 fdisp_destroy(&fdi); 2480 return err; 2481 } 2482 2483 /* 2484 struct vnop_write_args { 2485 struct vnode *a_vp; 2486 struct uio *a_uio; 2487 int a_ioflag; 2488 struct ucred *a_cred; 2489 }; 2490 */ 2491 static int 2492 fuse_vnop_write(struct vop_write_args *ap) 2493 { 2494 struct vnode *vp = ap->a_vp; 2495 struct uio *uio = ap->a_uio; 2496 int ioflag = ap->a_ioflag; 2497 struct ucred *cred = ap->a_cred; 2498 pid_t pid = curthread->td_proc->p_pid; 2499 struct fuse_filehandle *fufh; 2500 int err; 2501 bool closefufh = false, directio; 2502 2503 MPASS(vp->v_type == VREG || vp->v_type == VDIR); 2504 2505 if (fuse_isdeadfs(vp)) { 2506 return (EXTERROR(ENXIO, "This FUSE session is about " 2507 "to be closed")); 2508 } 2509 2510 if (VTOFUD(vp)->flag & FN_DIRECTIO) { 2511 ioflag |= IO_DIRECT; 2512 } 2513 2514 err = fuse_filehandle_getrw(vp, FWRITE, &fufh, cred, pid); 2515 if (err == EBADF && vnode_mount(vp)->mnt_flag & MNT_EXPORTED) { 2516 /* 2517 * nfsd will do I/O without first doing VOP_OPEN. We 2518 * must implicitly open the file here 2519 */ 2520 err = fuse_filehandle_open(vp, FWRITE, &fufh, curthread, cred); 2521 closefufh = true; 2522 } 2523 if (err) { 2524 SDT_PROBE3(fusefs, , vnops, filehandles_closed, vp, uio, cred); 2525 return err; 2526 } 2527 2528 /* 2529 * Ideally, when the daemon asks for direct io at open time, the 2530 * standard file flag should be set according to this, so that would 2531 * just change the default mode, which later on could be changed via 2532 * fcntl(2). 2533 * But this doesn't work, the O_DIRECT flag gets cleared at some point 2534 * (don't know where). So to make any use of the Fuse direct_io option, 2535 * we hardwire it into the file's private data (similarly to Linux, 2536 * btw.). 2537 */ 2538 directio = (ioflag & IO_DIRECT) || !fsess_opt_datacache(vnode_mount(vp)); 2539 2540 fuse_vnode_update(vp, FN_MTIMECHANGE | FN_CTIMECHANGE); 2541 if (directio) { 2542 off_t start, end, filesize; 2543 bool pages = (ioflag & IO_VMIO) != 0; 2544 2545 SDT_PROBE2(fusefs, , vnops, trace, 1, "direct write of vnode"); 2546 2547 err = fuse_vnode_size(vp, &filesize, cred, curthread); 2548 if (err) 2549 goto out; 2550 2551 start = uio->uio_offset; 2552 end = start + uio->uio_resid; 2553 if (!pages) { 2554 err = fuse_inval_buf_range(vp, filesize, start, 2555 end); 2556 if (err) 2557 goto out; 2558 } 2559 err = fuse_write_directbackend(vp, uio, cred, fufh, 2560 filesize, ioflag, pages); 2561 } else { 2562 SDT_PROBE2(fusefs, , vnops, trace, 1, 2563 "buffered write of vnode"); 2564 if (!fsess_opt_writeback(vnode_mount(vp))) 2565 ioflag |= IO_SYNC; 2566 err = fuse_write_biobackend(vp, uio, cred, fufh, ioflag, pid); 2567 } 2568 fuse_internal_clear_suid_on_write(vp, cred, uio->uio_td); 2569 2570 out: 2571 if (closefufh) 2572 fuse_filehandle_close(vp, fufh, curthread, cred); 2573 2574 return (err); 2575 } 2576 2577 static daddr_t 2578 fuse_gbp_getblkno(struct vnode *vp, vm_ooffset_t off) 2579 { 2580 const int biosize = fuse_iosize(vp); 2581 2582 return (off / biosize); 2583 } 2584 2585 static int 2586 fuse_gbp_getblksz(struct vnode *vp, daddr_t lbn, long *blksz) 2587 { 2588 off_t filesize; 2589 int err; 2590 const int biosize = fuse_iosize(vp); 2591 2592 err = fuse_vnode_size(vp, &filesize, NULL, NULL); 2593 if (err) { 2594 /* This will turn into a SIGBUS */ 2595 return (EIO); 2596 } else if ((off_t)lbn * biosize >= filesize) { 2597 *blksz = 0; 2598 } else if ((off_t)(lbn + 1) * biosize > filesize) { 2599 *blksz = filesize - (off_t)lbn *biosize; 2600 } else { 2601 *blksz = biosize; 2602 } 2603 return (0); 2604 } 2605 2606 /* 2607 struct vnop_getpages_args { 2608 struct vnode *a_vp; 2609 vm_page_t *a_m; 2610 int a_count; 2611 int a_reqpage; 2612 }; 2613 */ 2614 static int 2615 fuse_vnop_getpages(struct vop_getpages_args *ap) 2616 { 2617 struct vnode *vp = ap->a_vp; 2618 2619 if (!fsess_opt_mmap(vnode_mount(vp))) { 2620 SDT_PROBE2(fusefs, , vnops, trace, 1, 2621 "called on non-cacheable vnode??\n"); 2622 return (VM_PAGER_ERROR); 2623 } 2624 2625 return (vfs_bio_getpages(vp, ap->a_m, ap->a_count, ap->a_rbehind, 2626 ap->a_rahead, fuse_gbp_getblkno, fuse_gbp_getblksz)); 2627 } 2628 2629 static const char extattr_namespace_separator = '.'; 2630 2631 /* 2632 struct vop_getextattr_args { 2633 struct vop_generic_args a_gen; 2634 struct vnode *a_vp; 2635 int a_attrnamespace; 2636 const char *a_name; 2637 struct uio *a_uio; 2638 size_t *a_size; 2639 struct ucred *a_cred; 2640 struct thread *a_td; 2641 }; 2642 */ 2643 static int 2644 fuse_vnop_getextattr(struct vop_getextattr_args *ap) 2645 { 2646 struct vnode *vp = ap->a_vp; 2647 struct uio *uio = ap->a_uio; 2648 struct fuse_dispatcher fdi; 2649 struct fuse_getxattr_in *get_xattr_in; 2650 struct fuse_getxattr_out *get_xattr_out; 2651 struct mount *mp = vnode_mount(vp); 2652 struct thread *td = ap->a_td; 2653 struct ucred *cred = ap->a_cred; 2654 char *prefix; 2655 char *attr_str; 2656 size_t len; 2657 int err; 2658 2659 if (fuse_isdeadfs(vp)) 2660 return (EXTERROR(ENXIO, "This FUSE session is about " 2661 "to be closed")); 2662 2663 if (fsess_not_impl(mp, FUSE_GETXATTR)) 2664 return (EXTERROR(EOPNOTSUPP, "This server does not implement " 2665 "extended attributes")); 2666 2667 err = fuse_extattr_check_cred(vp, ap->a_attrnamespace, cred, td, VREAD); 2668 if (err) 2669 return err; 2670 2671 /* Default to looking for user attributes. */ 2672 if (ap->a_attrnamespace == EXTATTR_NAMESPACE_SYSTEM) 2673 prefix = EXTATTR_NAMESPACE_SYSTEM_STRING; 2674 else 2675 prefix = EXTATTR_NAMESPACE_USER_STRING; 2676 2677 len = strlen(prefix) + sizeof(extattr_namespace_separator) + 2678 strlen(ap->a_name) + 1; 2679 2680 fdisp_init(&fdi, len + sizeof(*get_xattr_in)); 2681 fdisp_make_vp(&fdi, FUSE_GETXATTR, vp, td, cred); 2682 2683 get_xattr_in = fdi.indata; 2684 /* 2685 * Check to see whether we're querying the available size or 2686 * issuing the actual request. If we pass in 0, we get back struct 2687 * fuse_getxattr_out. If we pass in a non-zero size, we get back 2688 * that much data, without the struct fuse_getxattr_out header. 2689 */ 2690 if (uio == NULL) 2691 get_xattr_in->size = 0; 2692 else 2693 get_xattr_in->size = uio->uio_resid; 2694 2695 attr_str = (char *)fdi.indata + sizeof(*get_xattr_in); 2696 snprintf(attr_str, len, "%s%c%s", prefix, extattr_namespace_separator, 2697 ap->a_name); 2698 2699 err = fdisp_wait_answ(&fdi); 2700 if (err != 0) { 2701 if (err == ENOSYS) { 2702 fsess_set_notimpl(mp, FUSE_GETXATTR); 2703 err = (EXTERROR(EOPNOTSUPP, "This server does not " 2704 "implement extended attributes")); 2705 } 2706 goto out; 2707 } 2708 2709 get_xattr_out = fdi.answ; 2710 2711 if (ap->a_size != NULL) 2712 *ap->a_size = get_xattr_out->size; 2713 2714 if (uio != NULL) 2715 err = uiomove(fdi.answ, fdi.iosize, uio); 2716 2717 out: 2718 fdisp_destroy(&fdi); 2719 return (err); 2720 } 2721 2722 /* 2723 struct vop_setextattr_args { 2724 struct vop_generic_args a_gen; 2725 struct vnode *a_vp; 2726 int a_attrnamespace; 2727 const char *a_name; 2728 struct uio *a_uio; 2729 struct ucred *a_cred; 2730 struct thread *a_td; 2731 }; 2732 */ 2733 static int 2734 fuse_vnop_setextattr(struct vop_setextattr_args *ap) 2735 { 2736 struct vnode *vp = ap->a_vp; 2737 struct uio *uio = ap->a_uio; 2738 struct fuse_dispatcher fdi; 2739 struct fuse_setxattr_in *set_xattr_in; 2740 struct mount *mp = vnode_mount(vp); 2741 struct thread *td = ap->a_td; 2742 struct ucred *cred = ap->a_cred; 2743 size_t struct_size = FUSE_COMPAT_SETXATTR_IN_SIZE; 2744 char *prefix; 2745 size_t len; 2746 char *attr_str; 2747 int err; 2748 2749 if (fuse_isdeadfs(vp)) 2750 return (EXTERROR(ENXIO, "This FUSE session is about " 2751 "to be closed")); 2752 2753 if (fsess_not_impl(mp, FUSE_SETXATTR)) 2754 return (EXTERROR(EOPNOTSUPP, "This server does not implement " 2755 "setting extended attributes")); 2756 2757 if (vfs_isrdonly(mp)) 2758 return EROFS; 2759 2760 /* Deleting xattrs must use VOP_DELETEEXTATTR instead */ 2761 if (ap->a_uio == NULL) { 2762 /* 2763 * If we got here as fallback from VOP_DELETEEXTATTR, then 2764 * return EOPNOTSUPP. 2765 */ 2766 if (fsess_not_impl(mp, FUSE_REMOVEXATTR)) 2767 return (EXTERROR(EOPNOTSUPP, "This server does not " 2768 "implement removing extended attributess")); 2769 else 2770 return (EXTERROR(EINVAL, "DELETEEXTATTR should be used " 2771 "to remove extattrs")); 2772 } 2773 2774 err = fuse_extattr_check_cred(vp, ap->a_attrnamespace, cred, td, 2775 VWRITE); 2776 if (err) 2777 return err; 2778 2779 /* Default to looking for user attributes. */ 2780 if (ap->a_attrnamespace == EXTATTR_NAMESPACE_SYSTEM) 2781 prefix = EXTATTR_NAMESPACE_SYSTEM_STRING; 2782 else 2783 prefix = EXTATTR_NAMESPACE_USER_STRING; 2784 2785 len = strlen(prefix) + sizeof(extattr_namespace_separator) + 2786 strlen(ap->a_name) + 1; 2787 2788 /* older FUSE servers use a smaller fuse_setxattr_in struct*/ 2789 if (fuse_libabi_geq(fuse_get_mpdata(mp), 7, 33)) 2790 struct_size = sizeof(*set_xattr_in); 2791 2792 fdisp_init(&fdi, len + struct_size + uio->uio_resid); 2793 fdisp_make_vp(&fdi, FUSE_SETXATTR, vp, td, cred); 2794 2795 set_xattr_in = fdi.indata; 2796 set_xattr_in->size = uio->uio_resid; 2797 2798 if (fuse_libabi_geq(fuse_get_mpdata(mp), 7, 33)) { 2799 set_xattr_in->setxattr_flags = 0; 2800 set_xattr_in->padding = 0; 2801 } 2802 2803 attr_str = (char *)fdi.indata + struct_size; 2804 snprintf(attr_str, len, "%s%c%s", prefix, extattr_namespace_separator, 2805 ap->a_name); 2806 2807 err = uiomove((char *)fdi.indata + struct_size + len, 2808 uio->uio_resid, uio); 2809 if (err != 0) { 2810 goto out; 2811 } 2812 2813 err = fdisp_wait_answ(&fdi); 2814 2815 if (err == ENOSYS) { 2816 fsess_set_notimpl(mp, FUSE_SETXATTR); 2817 err = EXTERROR(EOPNOTSUPP, "This server does not implement " 2818 "setting extended attributes"); 2819 } 2820 if (err == ERESTART) { 2821 /* Can't restart after calling uiomove */ 2822 err = EINTR; 2823 } 2824 2825 out: 2826 fdisp_destroy(&fdi); 2827 return (err); 2828 } 2829 2830 /* 2831 * The Linux / FUSE extended attribute list is simply a collection of 2832 * NUL-terminated strings. The FreeBSD extended attribute list is a single 2833 * byte length followed by a non-NUL terminated string. So, this allows 2834 * conversion of the Linux / FUSE format to the FreeBSD format in place. 2835 * Linux attribute names are reported with the namespace as a prefix (e.g. 2836 * "user.attribute_name"), but in FreeBSD they are reported without the 2837 * namespace prefix (e.g. "attribute_name"). So, we're going from: 2838 * 2839 * user.attr_name1\0user.attr_name2\0 2840 * 2841 * to: 2842 * 2843 * <num>attr_name1<num>attr_name2 2844 * 2845 * Where "<num>" is a single byte number of characters in the attribute name. 2846 * 2847 * Args: 2848 * prefix - exattr namespace prefix string 2849 * list, list_len - input list with namespace prefixes 2850 * bsd_list, bsd_list_len - output list compatible with bsd vfs 2851 */ 2852 static int 2853 fuse_xattrlist_convert(char *prefix, const char *list, int list_len, 2854 char *bsd_list, int *bsd_list_len) 2855 { 2856 int len, pos, dist_to_next, prefix_len; 2857 2858 pos = 0; 2859 *bsd_list_len = 0; 2860 prefix_len = strlen(prefix); 2861 2862 while (pos < list_len && list[pos] != '\0') { 2863 dist_to_next = strlen(&list[pos]) + 1; 2864 if (bcmp(&list[pos], prefix, prefix_len) == 0 && 2865 list[pos + prefix_len] == extattr_namespace_separator) { 2866 len = dist_to_next - 2867 (prefix_len + sizeof(extattr_namespace_separator)) - 1; 2868 if (len >= EXTATTR_MAXNAMELEN) 2869 return (ENAMETOOLONG); 2870 2871 bsd_list[*bsd_list_len] = len; 2872 memcpy(&bsd_list[*bsd_list_len + 1], 2873 &list[pos + prefix_len + 2874 sizeof(extattr_namespace_separator)], len); 2875 2876 *bsd_list_len += len + 1; 2877 } 2878 2879 pos += dist_to_next; 2880 } 2881 2882 return (0); 2883 } 2884 2885 /* 2886 * List extended attributes 2887 * 2888 * The FUSE_LISTXATTR operation is based on Linux's listxattr(2) syscall, which 2889 * has a number of differences compared to its FreeBSD equivalent, 2890 * extattr_list_file: 2891 * 2892 * - FUSE_LISTXATTR returns all extended attributes across all namespaces, 2893 * whereas listxattr(2) only returns attributes for a single namespace 2894 * - FUSE_LISTXATTR prepends each attribute name with "namespace." 2895 * - If the provided buffer is not large enough to hold the result, 2896 * FUSE_LISTXATTR should return ERANGE, whereas listxattr is expected to 2897 * return as many results as will fit. 2898 */ 2899 /* 2900 struct vop_listextattr_args { 2901 struct vop_generic_args a_gen; 2902 struct vnode *a_vp; 2903 int a_attrnamespace; 2904 struct uio *a_uio; 2905 size_t *a_size; 2906 struct ucred *a_cred; 2907 struct thread *a_td; 2908 }; 2909 */ 2910 static int 2911 fuse_vnop_listextattr(struct vop_listextattr_args *ap) 2912 { 2913 struct vnode *vp = ap->a_vp; 2914 struct uio *uio = ap->a_uio; 2915 struct fuse_dispatcher fdi; 2916 struct fuse_listxattr_in *list_xattr_in; 2917 struct fuse_listxattr_out *list_xattr_out; 2918 struct mount *mp = vnode_mount(vp); 2919 struct thread *td = ap->a_td; 2920 struct ucred *cred = ap->a_cred; 2921 char *prefix; 2922 char *bsd_list = NULL; 2923 char *linux_list; 2924 int bsd_list_len; 2925 int linux_list_len; 2926 int err; 2927 2928 if (fuse_isdeadfs(vp)) 2929 return (EXTERROR(ENXIO, "This FUSE session is about " 2930 "to be closed")); 2931 2932 if (fsess_not_impl(mp, FUSE_LISTXATTR)) 2933 return (EXTERROR(EOPNOTSUPP, "This server does not implement " 2934 "extended attributes")); 2935 2936 err = fuse_extattr_check_cred(vp, ap->a_attrnamespace, cred, td, VREAD); 2937 if (err) 2938 return err; 2939 2940 /* 2941 * Add space for a NUL and the period separator if enabled. 2942 * Default to looking for user attributes. 2943 */ 2944 if (ap->a_attrnamespace == EXTATTR_NAMESPACE_SYSTEM) 2945 prefix = EXTATTR_NAMESPACE_SYSTEM_STRING; 2946 else 2947 prefix = EXTATTR_NAMESPACE_USER_STRING; 2948 2949 fdisp_init(&fdi, sizeof(*list_xattr_in)); 2950 fdisp_make_vp(&fdi, FUSE_LISTXATTR, vp, td, cred); 2951 2952 /* 2953 * Retrieve Linux / FUSE compatible list size. 2954 */ 2955 list_xattr_in = fdi.indata; 2956 list_xattr_in->size = 0; 2957 2958 err = fdisp_wait_answ(&fdi); 2959 if (err != 0) { 2960 if (err == ENOSYS) { 2961 fsess_set_notimpl(mp, FUSE_LISTXATTR); 2962 err = EXTERROR(EOPNOTSUPP, "This server does not " 2963 "implement extended attributes"); 2964 } 2965 goto out; 2966 } 2967 2968 list_xattr_out = fdi.answ; 2969 linux_list_len = list_xattr_out->size; 2970 if (linux_list_len == 0) { 2971 if (ap->a_size != NULL) 2972 *ap->a_size = linux_list_len; 2973 goto out; 2974 } 2975 2976 /* 2977 * Retrieve Linux / FUSE compatible list values. 2978 */ 2979 fdisp_refresh_vp(&fdi, FUSE_LISTXATTR, vp, td, cred); 2980 list_xattr_in = fdi.indata; 2981 list_xattr_in->size = linux_list_len; 2982 2983 err = fdisp_wait_answ(&fdi); 2984 if (err == ERANGE) { 2985 /* 2986 * Race detected. The attribute list must've grown since the 2987 * first FUSE_LISTXATTR call. Start over. Go all the way back 2988 * to userland so we can process signals, if necessary, before 2989 * restarting. 2990 */ 2991 err = ERESTART; 2992 goto out; 2993 } else if (err != 0) 2994 goto out; 2995 2996 linux_list = fdi.answ; 2997 /* FUSE doesn't allow the server to return more data than requested */ 2998 if (fdi.iosize > linux_list_len) { 2999 struct fuse_data *data = fuse_get_mpdata(mp); 3000 3001 fuse_warn(data, FSESS_WARN_LSEXTATTR_LONG, 3002 "server returned " 3003 "more extended attribute data than requested; " 3004 "should've returned ERANGE instead."); 3005 } else { 3006 /* But returning less data is fine */ 3007 linux_list_len = fdi.iosize; 3008 } 3009 3010 /* 3011 * Retrieve the BSD compatible list values. 3012 * The Linux / FUSE attribute list format isn't the same 3013 * as FreeBSD's format. So we need to transform it into 3014 * FreeBSD's format before giving it to the user. 3015 */ 3016 bsd_list = malloc(linux_list_len, M_TEMP, M_WAITOK); 3017 err = fuse_xattrlist_convert(prefix, linux_list, linux_list_len, 3018 bsd_list, &bsd_list_len); 3019 if (err != 0) 3020 goto out; 3021 3022 if (ap->a_size != NULL) 3023 *ap->a_size = bsd_list_len; 3024 3025 if (uio != NULL) 3026 err = uiomove(bsd_list, bsd_list_len, uio); 3027 3028 out: 3029 free(bsd_list, M_TEMP); 3030 fdisp_destroy(&fdi); 3031 return (err); 3032 } 3033 3034 /* 3035 struct vop_deallocate_args { 3036 struct vop_generic_args a_gen; 3037 struct vnode *a_vp; 3038 off_t *a_offset; 3039 off_t *a_len; 3040 int a_flags; 3041 int a_ioflag; 3042 struct ucred *a_cred; 3043 }; 3044 */ 3045 static int 3046 fuse_vnop_deallocate(struct vop_deallocate_args *ap) 3047 { 3048 struct vnode *vp = ap->a_vp; 3049 struct mount *mp = vnode_mount(vp); 3050 struct fuse_filehandle *fufh; 3051 struct fuse_dispatcher fdi; 3052 struct fuse_fallocate_in *ffi; 3053 struct ucred *cred = ap->a_cred; 3054 pid_t pid = curthread->td_proc->p_pid; 3055 off_t *len = ap->a_len; 3056 off_t *offset = ap->a_offset; 3057 int ioflag = ap->a_ioflag; 3058 off_t filesize; 3059 int err; 3060 bool closefufh = false; 3061 3062 if (fuse_isdeadfs(vp)) 3063 return (EXTERROR(ENXIO, "This FUSE session is about " 3064 "to be closed")); 3065 3066 if (vfs_isrdonly(mp)) 3067 return (EROFS); 3068 3069 if (fsess_not_impl(mp, FUSE_FALLOCATE)) 3070 goto fallback; 3071 3072 err = fuse_filehandle_getrw(vp, FWRITE, &fufh, cred, pid); 3073 if (err == EBADF && vnode_mount(vp)->mnt_flag & MNT_EXPORTED) { 3074 /* 3075 * nfsd will do I/O without first doing VOP_OPEN. We 3076 * must implicitly open the file here 3077 */ 3078 err = fuse_filehandle_open(vp, FWRITE, &fufh, curthread, cred); 3079 closefufh = true; 3080 } 3081 if (err) 3082 return (err); 3083 3084 fuse_vnode_update(vp, FN_MTIMECHANGE | FN_CTIMECHANGE); 3085 3086 err = fuse_vnode_size(vp, &filesize, cred, curthread); 3087 if (err) 3088 goto out; 3089 fuse_inval_buf_range(vp, filesize, *offset, *offset + *len); 3090 3091 fdisp_init(&fdi, sizeof(*ffi)); 3092 fdisp_make_vp(&fdi, FUSE_FALLOCATE, vp, curthread, cred); 3093 ffi = fdi.indata; 3094 ffi->fh = fufh->fh_id; 3095 ffi->offset = *offset; 3096 ffi->length = *len; 3097 /* 3098 * FreeBSD's fspacectl is equivalent to Linux's fallocate with 3099 * mode == FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE 3100 */ 3101 ffi->mode = FUSE_FALLOC_FL_PUNCH_HOLE | FUSE_FALLOC_FL_KEEP_SIZE; 3102 err = fdisp_wait_answ(&fdi); 3103 3104 if (err == ENOSYS) { 3105 fdisp_destroy(&fdi); 3106 fsess_set_notimpl(mp, FUSE_FALLOCATE); 3107 goto fallback; 3108 } else if (err == EOPNOTSUPP) { 3109 /* 3110 * The file system server does not support FUSE_FALLOCATE with 3111 * the supplied mode for this particular file. 3112 */ 3113 fdisp_destroy(&fdi); 3114 goto fallback; 3115 } else if (!err) { 3116 /* 3117 * Clip the returned offset to EoF. Do it here rather than 3118 * before FUSE_FALLOCATE just in case the kernel's cached file 3119 * size is out of date. Unfortunately, FUSE does not return 3120 * any information about filesize from that operation. 3121 */ 3122 *offset = MIN(*offset + *len, filesize); 3123 *len = 0; 3124 fuse_vnode_undirty_cached_timestamps(vp, false); 3125 fuse_internal_clear_suid_on_write(vp, cred, curthread); 3126 3127 if (ioflag & IO_SYNC) 3128 err = fuse_internal_fsync(vp, curthread, MNT_WAIT, 3129 false); 3130 } 3131 3132 fdisp_destroy(&fdi); 3133 out: 3134 if (closefufh) 3135 fuse_filehandle_close(vp, fufh, curthread, cred); 3136 3137 return (err); 3138 3139 fallback: 3140 if (closefufh) 3141 fuse_filehandle_close(vp, fufh, curthread, cred); 3142 3143 return (vop_stddeallocate(ap)); 3144 } 3145 3146 /* 3147 struct vop_deleteextattr_args { 3148 struct vop_generic_args a_gen; 3149 struct vnode *a_vp; 3150 int a_attrnamespace; 3151 const char *a_name; 3152 struct ucred *a_cred; 3153 struct thread *a_td; 3154 }; 3155 */ 3156 static int 3157 fuse_vnop_deleteextattr(struct vop_deleteextattr_args *ap) 3158 { 3159 struct vnode *vp = ap->a_vp; 3160 struct fuse_dispatcher fdi; 3161 struct mount *mp = vnode_mount(vp); 3162 struct thread *td = ap->a_td; 3163 struct ucred *cred = ap->a_cred; 3164 char *prefix; 3165 size_t len; 3166 char *attr_str; 3167 int err; 3168 3169 if (fuse_isdeadfs(vp)) 3170 return (EXTERROR(ENXIO, "This FUSE session is about " 3171 "to be closed")); 3172 3173 if (fsess_not_impl(mp, FUSE_REMOVEXATTR)) 3174 return (EXTERROR(EOPNOTSUPP, "This server does not implement " 3175 "removing extended attributes")); 3176 3177 if (vfs_isrdonly(mp)) 3178 return EROFS; 3179 3180 err = fuse_extattr_check_cred(vp, ap->a_attrnamespace, cred, td, 3181 VWRITE); 3182 if (err) 3183 return err; 3184 3185 /* Default to looking for user attributes. */ 3186 if (ap->a_attrnamespace == EXTATTR_NAMESPACE_SYSTEM) 3187 prefix = EXTATTR_NAMESPACE_SYSTEM_STRING; 3188 else 3189 prefix = EXTATTR_NAMESPACE_USER_STRING; 3190 3191 len = strlen(prefix) + sizeof(extattr_namespace_separator) + 3192 strlen(ap->a_name) + 1; 3193 3194 fdisp_init(&fdi, len); 3195 fdisp_make_vp(&fdi, FUSE_REMOVEXATTR, vp, td, cred); 3196 3197 attr_str = fdi.indata; 3198 snprintf(attr_str, len, "%s%c%s", prefix, extattr_namespace_separator, 3199 ap->a_name); 3200 3201 err = fdisp_wait_answ(&fdi); 3202 if (err == ENOSYS) { 3203 fsess_set_notimpl(mp, FUSE_REMOVEXATTR); 3204 err = EXTERROR(EOPNOTSUPP, "This server does not implement " 3205 "removing extended attributes"); 3206 } 3207 3208 fdisp_destroy(&fdi); 3209 return (err); 3210 } 3211 3212 /* 3213 struct vnop_print_args { 3214 struct vnode *a_vp; 3215 }; 3216 */ 3217 static int 3218 fuse_vnop_print(struct vop_print_args *ap) 3219 { 3220 struct fuse_vnode_data *fvdat = VTOFUD(ap->a_vp); 3221 3222 printf("nodeid: %ju, parent nodeid: %ju, nlookup: %ju, flag: %#x\n", 3223 (uintmax_t)VTOILLU(ap->a_vp), (uintmax_t)fvdat->parent_nid, 3224 (uintmax_t)fvdat->nlookup, 3225 fvdat->flag); 3226 3227 return 0; 3228 } 3229 3230 /* 3231 * Get an NFS filehandle for a FUSE file. 3232 * 3233 * This will only work for FUSE file systems that guarantee the uniqueness of 3234 * nodeid:generation, which most don't. 3235 */ 3236 /* 3237 vop_vptofh { 3238 IN struct vnode *a_vp; 3239 IN struct fid *a_fhp; 3240 }; 3241 */ 3242 static int 3243 fuse_vnop_vptofh(struct vop_vptofh_args *ap) 3244 { 3245 struct vnode *vp = ap->a_vp; 3246 struct fuse_vnode_data *fvdat = VTOFUD(vp); 3247 struct fuse_fid *fhp = (struct fuse_fid *)(ap->a_fhp); 3248 _Static_assert(sizeof(struct fuse_fid) <= sizeof(struct fid), 3249 "FUSE fid type is too big"); 3250 struct mount *mp = vnode_mount(vp); 3251 struct fuse_data *data = fuse_get_mpdata(mp); 3252 struct vattr va; 3253 int err; 3254 3255 if (!(data->dataflags & FSESS_EXPORT_SUPPORT)) { 3256 /* NFS requires lookups for "." and ".." */ 3257 SDT_PROBE2(fusefs, , vnops, trace, 1, 3258 "VOP_VPTOFH without FUSE_EXPORT_SUPPORT"); 3259 return (EXTERROR(EOPNOTSUPP, "This server is " 3260 "missing FUSE_EXPORT_SUPPORT")); 3261 } 3262 if ((mp->mnt_flag & MNT_EXPORTED) && 3263 fsess_is_impl(mp, FUSE_OPENDIR)) 3264 { 3265 /* 3266 * NFS is stateless, so nfsd must reopen a directory on every 3267 * call to VOP_READDIR, passing in the d_off field from the 3268 * final dirent of the previous invocation. But if the server 3269 * implements FUSE_OPENDIR, the FUSE protocol does not 3270 * guarantee that d_off will be valid after a directory is 3271 * closed and reopened. So prohibit exporting FUSE file 3272 * systems that implement FUSE_OPENDIR. 3273 * 3274 * But userspace NFS servers don't have this problem. 3275 */ 3276 SDT_PROBE2(fusefs, , vnops, trace, 1, 3277 "VOP_VPTOFH with FUSE_OPENDIR"); 3278 return (EXTERROR(EOPNOTSUPP, "This server implements " 3279 "FUSE_OPENDIR so is not compatible with getfh")); 3280 } 3281 3282 err = fuse_internal_getattr(vp, &va, curthread->td_ucred, curthread); 3283 if (err) 3284 return err; 3285 3286 /*ip = VTOI(ap->a_vp);*/ 3287 /*ufhp = (struct ufid *)ap->a_fhp;*/ 3288 fhp->len = sizeof(struct fuse_fid); 3289 fhp->nid = fvdat->nid; 3290 if (fvdat->generation <= UINT32_MAX) 3291 fhp->gen = fvdat->generation; 3292 else 3293 return (EXTERROR(EOVERFLOW, "inode generation " 3294 "number overflow")); 3295 return (0); 3296 } 3297