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