1 /* $NetBSD: tmpfs_vnops.c,v 1.39 2007/07/23 15:41:01 jmmv Exp $ */ 2 3 /*- 4 * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code 9 * 2005 program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * tmpfs vnode interface. 35 */ 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 #include <sys/param.h> 40 #include <sys/fcntl.h> 41 #include <sys/lockf.h> 42 #include <sys/namei.h> 43 #include <sys/priv.h> 44 #include <sys/proc.h> 45 #include <sys/resourcevar.h> 46 #include <sys/stat.h> 47 #include <sys/systm.h> 48 #include <sys/unistd.h> 49 #include <sys/vnode.h> 50 51 #include <vm/vm.h> 52 #include <vm/vm_object.h> 53 #include <vm/vm_page.h> 54 #include <vm/vm_pager.h> 55 #include <sys/sched.h> 56 #include <sys/sf_buf.h> 57 #include <machine/_inttypes.h> 58 59 #include <fs/fifofs/fifo.h> 60 #include <fs/tmpfs/tmpfs_vnops.h> 61 #include <fs/tmpfs/tmpfs.h> 62 63 /* --------------------------------------------------------------------- */ 64 65 static int 66 tmpfs_lookup(struct vop_cachedlookup_args *v) 67 { 68 struct vnode *dvp = v->a_dvp; 69 struct vnode **vpp = v->a_vpp; 70 struct componentname *cnp = v->a_cnp; 71 struct thread *td = cnp->cn_thread; 72 73 int error; 74 struct tmpfs_dirent *de; 75 struct tmpfs_node *dnode; 76 77 dnode = VP_TO_TMPFS_DIR(dvp); 78 *vpp = NULLVP; 79 80 /* Check accessibility of requested node as a first step. */ 81 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td); 82 if (error != 0) 83 goto out; 84 85 /* We cannot be requesting the parent directory of the root node. */ 86 MPASS(IMPLIES(dnode->tn_type == VDIR && 87 dnode->tn_dir.tn_parent == dnode, 88 !(cnp->cn_flags & ISDOTDOT))); 89 90 if (cnp->cn_flags & ISDOTDOT) { 91 int ltype = 0; 92 93 ltype = VOP_ISLOCKED(dvp); 94 vhold(dvp); 95 VOP_UNLOCK(dvp, 0); 96 /* Allocate a new vnode on the matching entry. */ 97 error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent, 98 cnp->cn_lkflags, vpp, td); 99 100 vn_lock(dvp, ltype | LK_RETRY); 101 vdrop(dvp); 102 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 103 VREF(dvp); 104 *vpp = dvp; 105 error = 0; 106 } else { 107 de = tmpfs_dir_lookup(dnode, cnp); 108 if (de == NULL) { 109 /* The entry was not found in the directory. 110 * This is OK if we are creating or renaming an 111 * entry and are working on the last component of 112 * the path name. */ 113 if ((cnp->cn_flags & ISLASTCN) && 114 (cnp->cn_nameiop == CREATE || \ 115 cnp->cn_nameiop == RENAME)) { 116 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 117 cnp->cn_thread); 118 if (error != 0) 119 goto out; 120 121 /* Keep the component name in the buffer for 122 * future uses. */ 123 cnp->cn_flags |= SAVENAME; 124 125 error = EJUSTRETURN; 126 } else 127 error = ENOENT; 128 } else { 129 struct tmpfs_node *tnode; 130 131 /* The entry was found, so get its associated 132 * tmpfs_node. */ 133 tnode = de->td_node; 134 135 /* If we are not at the last path component and 136 * found a non-directory or non-link entry (which 137 * may itself be pointing to a directory), raise 138 * an error. */ 139 if ((tnode->tn_type != VDIR && 140 tnode->tn_type != VLNK) && 141 !(cnp->cn_flags & ISLASTCN)) { 142 error = ENOTDIR; 143 goto out; 144 } 145 146 /* If we are deleting or renaming the entry, keep 147 * track of its tmpfs_dirent so that it can be 148 * easily deleted later. */ 149 if ((cnp->cn_flags & ISLASTCN) && 150 (cnp->cn_nameiop == DELETE || 151 cnp->cn_nameiop == RENAME)) { 152 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 153 cnp->cn_thread); 154 if (error != 0) 155 goto out; 156 157 /* Allocate a new vnode on the matching entry. */ 158 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 159 cnp->cn_lkflags, vpp, td); 160 if (error != 0) 161 goto out; 162 163 if ((dnode->tn_mode & S_ISTXT) && 164 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, cnp->cn_thread) && 165 VOP_ACCESS(*vpp, VADMIN, cnp->cn_cred, cnp->cn_thread)) { 166 error = EPERM; 167 vput(*vpp); 168 *vpp = NULL; 169 goto out; 170 } 171 cnp->cn_flags |= SAVENAME; 172 } else { 173 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 174 cnp->cn_lkflags, vpp, td); 175 } 176 } 177 } 178 179 /* Store the result of this lookup in the cache. Avoid this if the 180 * request was for creation, as it does not improve timings on 181 * emprical tests. */ 182 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) 183 cache_enter(dvp, *vpp, cnp); 184 185 out: 186 /* If there were no errors, *vpp cannot be null and it must be 187 * locked. */ 188 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp))); 189 190 return error; 191 } 192 193 /* --------------------------------------------------------------------- */ 194 195 static int 196 tmpfs_create(struct vop_create_args *v) 197 { 198 struct vnode *dvp = v->a_dvp; 199 struct vnode **vpp = v->a_vpp; 200 struct componentname *cnp = v->a_cnp; 201 struct vattr *vap = v->a_vap; 202 203 MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 204 205 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 206 } 207 /* --------------------------------------------------------------------- */ 208 209 static int 210 tmpfs_mknod(struct vop_mknod_args *v) 211 { 212 struct vnode *dvp = v->a_dvp; 213 struct vnode **vpp = v->a_vpp; 214 struct componentname *cnp = v->a_cnp; 215 struct vattr *vap = v->a_vap; 216 217 if (vap->va_type != VBLK && vap->va_type != VCHR && 218 vap->va_type != VFIFO) 219 return EINVAL; 220 221 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 222 } 223 224 /* --------------------------------------------------------------------- */ 225 226 static int 227 tmpfs_open(struct vop_open_args *v) 228 { 229 struct vnode *vp = v->a_vp; 230 int mode = v->a_mode; 231 232 int error; 233 struct tmpfs_node *node; 234 235 MPASS(VOP_ISLOCKED(vp)); 236 237 node = VP_TO_TMPFS_NODE(vp); 238 239 /* The file is still active but all its names have been removed 240 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 241 * it is about to die. */ 242 if (node->tn_links < 1) 243 return (ENOENT); 244 245 /* If the file is marked append-only, deny write requests. */ 246 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 247 error = EPERM; 248 else { 249 error = 0; 250 vnode_create_vobject(vp, node->tn_size, v->a_td); 251 } 252 253 MPASS(VOP_ISLOCKED(vp)); 254 return error; 255 } 256 257 /* --------------------------------------------------------------------- */ 258 259 static int 260 tmpfs_close(struct vop_close_args *v) 261 { 262 struct vnode *vp = v->a_vp; 263 264 struct tmpfs_node *node; 265 266 MPASS(VOP_ISLOCKED(vp)); 267 268 node = VP_TO_TMPFS_NODE(vp); 269 270 if (node->tn_links > 0) { 271 /* Update node times. No need to do it if the node has 272 * been deleted, because it will vanish after we return. */ 273 tmpfs_update(vp); 274 } 275 276 return 0; 277 } 278 279 /* --------------------------------------------------------------------- */ 280 281 int 282 tmpfs_access(struct vop_access_args *v) 283 { 284 struct vnode *vp = v->a_vp; 285 accmode_t accmode = v->a_accmode; 286 struct ucred *cred = v->a_cred; 287 288 int error; 289 struct tmpfs_node *node; 290 291 MPASS(VOP_ISLOCKED(vp)); 292 293 node = VP_TO_TMPFS_NODE(vp); 294 295 switch (vp->v_type) { 296 case VDIR: 297 /* FALLTHROUGH */ 298 case VLNK: 299 /* FALLTHROUGH */ 300 case VREG: 301 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 302 error = EROFS; 303 goto out; 304 } 305 break; 306 307 case VBLK: 308 /* FALLTHROUGH */ 309 case VCHR: 310 /* FALLTHROUGH */ 311 case VSOCK: 312 /* FALLTHROUGH */ 313 case VFIFO: 314 break; 315 316 default: 317 error = EINVAL; 318 goto out; 319 } 320 321 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 322 error = EPERM; 323 goto out; 324 } 325 326 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 327 node->tn_gid, accmode, cred, NULL); 328 329 out: 330 MPASS(VOP_ISLOCKED(vp)); 331 332 return error; 333 } 334 335 /* --------------------------------------------------------------------- */ 336 337 int 338 tmpfs_getattr(struct vop_getattr_args *v) 339 { 340 struct vnode *vp = v->a_vp; 341 struct vattr *vap = v->a_vap; 342 343 struct tmpfs_node *node; 344 345 node = VP_TO_TMPFS_NODE(vp); 346 347 tmpfs_update(vp); 348 349 vap->va_type = vp->v_type; 350 vap->va_mode = node->tn_mode; 351 vap->va_nlink = node->tn_links; 352 vap->va_uid = node->tn_uid; 353 vap->va_gid = node->tn_gid; 354 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 355 vap->va_fileid = node->tn_id; 356 vap->va_size = node->tn_size; 357 vap->va_blocksize = PAGE_SIZE; 358 vap->va_atime = node->tn_atime; 359 vap->va_mtime = node->tn_mtime; 360 vap->va_ctime = node->tn_ctime; 361 vap->va_birthtime = node->tn_birthtime; 362 vap->va_gen = node->tn_gen; 363 vap->va_flags = node->tn_flags; 364 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 365 node->tn_rdev : NODEV; 366 vap->va_bytes = round_page(node->tn_size); 367 vap->va_filerev = 0; 368 369 return 0; 370 } 371 372 /* --------------------------------------------------------------------- */ 373 374 /* XXX Should this operation be atomic? I think it should, but code in 375 * XXX other places (e.g., ufs) doesn't seem to be... */ 376 int 377 tmpfs_setattr(struct vop_setattr_args *v) 378 { 379 struct vnode *vp = v->a_vp; 380 struct vattr *vap = v->a_vap; 381 struct ucred *cred = v->a_cred; 382 struct thread *td = curthread; 383 384 int error; 385 386 MPASS(VOP_ISLOCKED(vp)); 387 388 error = 0; 389 390 /* Abort if any unsettable attribute is given. */ 391 if (vap->va_type != VNON || 392 vap->va_nlink != VNOVAL || 393 vap->va_fsid != VNOVAL || 394 vap->va_fileid != VNOVAL || 395 vap->va_blocksize != VNOVAL || 396 vap->va_gen != VNOVAL || 397 vap->va_rdev != VNOVAL || 398 vap->va_bytes != VNOVAL) 399 error = EINVAL; 400 401 if (error == 0 && (vap->va_flags != VNOVAL)) 402 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 403 404 if (error == 0 && (vap->va_size != VNOVAL)) 405 error = tmpfs_chsize(vp, vap->va_size, cred, td); 406 407 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 408 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 409 410 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 411 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 412 413 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 414 vap->va_atime.tv_nsec != VNOVAL) || 415 (vap->va_mtime.tv_sec != VNOVAL && 416 vap->va_mtime.tv_nsec != VNOVAL) || 417 (vap->va_birthtime.tv_sec != VNOVAL && 418 vap->va_birthtime.tv_nsec != VNOVAL))) 419 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 420 &vap->va_birthtime, vap->va_vaflags, cred, td); 421 422 /* Update the node times. We give preference to the error codes 423 * generated by this function rather than the ones that may arise 424 * from tmpfs_update. */ 425 tmpfs_update(vp); 426 427 MPASS(VOP_ISLOCKED(vp)); 428 429 return error; 430 } 431 432 /* --------------------------------------------------------------------- */ 433 434 static int 435 tmpfs_mappedread(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 436 { 437 vm_pindex_t idx; 438 vm_page_t m; 439 struct sf_buf *sf; 440 off_t offset, addr; 441 size_t tlen; 442 caddr_t va; 443 int error; 444 445 addr = uio->uio_offset; 446 idx = OFF_TO_IDX(addr); 447 offset = addr & PAGE_MASK; 448 tlen = MIN(PAGE_SIZE - offset, len); 449 450 if ((vobj == NULL) || (vobj->resident_page_count == 0)) 451 goto nocache; 452 453 VM_OBJECT_LOCK(vobj); 454 lookupvpg: 455 if (((m = vm_page_lookup(vobj, idx)) != NULL) && 456 vm_page_is_valid(m, offset, tlen)) { 457 if (vm_page_sleep_if_busy(m, FALSE, "tmfsmr")) 458 goto lookupvpg; 459 vm_page_busy(m); 460 VM_OBJECT_UNLOCK(vobj); 461 sched_pin(); 462 sf = sf_buf_alloc(m, SFB_CPUPRIVATE); 463 va = (caddr_t)sf_buf_kva(sf); 464 error = uiomove(va + offset, tlen, uio); 465 sf_buf_free(sf); 466 sched_unpin(); 467 VM_OBJECT_LOCK(vobj); 468 vm_page_wakeup(m); 469 VM_OBJECT_UNLOCK(vobj); 470 return (error); 471 } 472 VM_OBJECT_UNLOCK(vobj); 473 nocache: 474 VM_OBJECT_LOCK(tobj); 475 vm_object_pip_add(tobj, 1); 476 m = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 477 VM_ALLOC_ZERO | VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 478 if (m->valid != VM_PAGE_BITS_ALL) { 479 int behind, ahead; 480 if (vm_pager_has_page(tobj, idx, &behind, &ahead)) { 481 error = vm_pager_get_pages(tobj, &m, 1, 0); 482 if (error != 0) { 483 printf("tmpfs get pages from pager error [read]\n"); 484 goto out; 485 } 486 } else 487 vm_page_zero_invalid(m, TRUE); 488 } 489 VM_OBJECT_UNLOCK(tobj); 490 sched_pin(); 491 sf = sf_buf_alloc(m, SFB_CPUPRIVATE); 492 va = (caddr_t)sf_buf_kva(sf); 493 error = uiomove(va + offset, tlen, uio); 494 sf_buf_free(sf); 495 sched_unpin(); 496 VM_OBJECT_LOCK(tobj); 497 out: 498 vm_page_lock_queues(); 499 vm_page_unwire(m, 0); 500 vm_page_activate(m); 501 vm_page_unlock_queues(); 502 vm_page_wakeup(m); 503 vm_object_pip_subtract(tobj, 1); 504 VM_OBJECT_UNLOCK(tobj); 505 506 return (error); 507 } 508 509 static int 510 tmpfs_read(struct vop_read_args *v) 511 { 512 struct vnode *vp = v->a_vp; 513 struct uio *uio = v->a_uio; 514 515 struct tmpfs_node *node; 516 vm_object_t uobj; 517 size_t len; 518 int resid; 519 520 int error = 0; 521 522 node = VP_TO_TMPFS_NODE(vp); 523 524 if (vp->v_type != VREG) { 525 error = EISDIR; 526 goto out; 527 } 528 529 if (uio->uio_offset < 0) { 530 error = EINVAL; 531 goto out; 532 } 533 534 node->tn_status |= TMPFS_NODE_ACCESSED; 535 536 uobj = node->tn_reg.tn_aobj; 537 while ((resid = uio->uio_resid) > 0) { 538 error = 0; 539 if (node->tn_size <= uio->uio_offset) 540 break; 541 len = MIN(node->tn_size - uio->uio_offset, resid); 542 if (len == 0) 543 break; 544 error = tmpfs_mappedread(vp->v_object, uobj, len, uio); 545 if ((error != 0) || (resid == uio->uio_resid)) 546 break; 547 } 548 549 out: 550 551 return error; 552 } 553 554 /* --------------------------------------------------------------------- */ 555 556 static int 557 tmpfs_mappedwrite(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 558 { 559 vm_pindex_t idx; 560 vm_page_t vpg, tpg; 561 struct sf_buf *sf; 562 off_t offset, addr; 563 size_t tlen; 564 caddr_t va; 565 int error; 566 567 error = 0; 568 569 addr = uio->uio_offset; 570 idx = OFF_TO_IDX(addr); 571 offset = addr & PAGE_MASK; 572 tlen = MIN(PAGE_SIZE - offset, len); 573 574 if ((vobj == NULL) || (vobj->resident_page_count == 0)) { 575 vpg = NULL; 576 goto nocache; 577 } 578 579 VM_OBJECT_LOCK(vobj); 580 lookupvpg: 581 if (((vpg = vm_page_lookup(vobj, idx)) != NULL) && 582 vm_page_is_valid(vpg, offset, tlen)) { 583 if (vm_page_sleep_if_busy(vpg, FALSE, "tmfsmw")) 584 goto lookupvpg; 585 vm_page_busy(vpg); 586 vm_page_lock_queues(); 587 vm_page_undirty(vpg); 588 vm_page_unlock_queues(); 589 VM_OBJECT_UNLOCK(vobj); 590 sched_pin(); 591 sf = sf_buf_alloc(vpg, SFB_CPUPRIVATE); 592 va = (caddr_t)sf_buf_kva(sf); 593 error = uiomove(va + offset, tlen, uio); 594 sf_buf_free(sf); 595 sched_unpin(); 596 } else { 597 VM_OBJECT_UNLOCK(vobj); 598 vpg = NULL; 599 } 600 nocache: 601 VM_OBJECT_LOCK(tobj); 602 vm_object_pip_add(tobj, 1); 603 tpg = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 604 VM_ALLOC_ZERO | VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 605 if (tpg->valid != VM_PAGE_BITS_ALL) { 606 int behind, ahead; 607 if (vm_pager_has_page(tobj, idx, &behind, &ahead)) { 608 error = vm_pager_get_pages(tobj, &tpg, 1, 0); 609 if (error != 0) { 610 printf("tmpfs get pages from pager error [write]\n"); 611 goto out; 612 } 613 } else 614 vm_page_zero_invalid(tpg, TRUE); 615 } 616 VM_OBJECT_UNLOCK(tobj); 617 if (vpg == NULL) { 618 sched_pin(); 619 sf = sf_buf_alloc(tpg, SFB_CPUPRIVATE); 620 va = (caddr_t)sf_buf_kva(sf); 621 error = uiomove(va + offset, tlen, uio); 622 sf_buf_free(sf); 623 sched_unpin(); 624 } else { 625 KASSERT(vpg->valid == VM_PAGE_BITS_ALL, ("parts of vpg invalid")); 626 pmap_copy_page(vpg, tpg); 627 } 628 VM_OBJECT_LOCK(tobj); 629 out: 630 if (vobj != NULL) 631 VM_OBJECT_LOCK(vobj); 632 vm_page_lock_queues(); 633 if (error == 0) { 634 vm_page_set_validclean(tpg, offset, tlen); 635 vm_page_zero_invalid(tpg, TRUE); 636 vm_page_dirty(tpg); 637 } 638 vm_page_unwire(tpg, 0); 639 vm_page_activate(tpg); 640 vm_page_unlock_queues(); 641 vm_page_wakeup(tpg); 642 if (vpg != NULL) 643 vm_page_wakeup(vpg); 644 if (vobj != NULL) 645 VM_OBJECT_UNLOCK(vobj); 646 vm_object_pip_subtract(tobj, 1); 647 VM_OBJECT_UNLOCK(tobj); 648 649 return (error); 650 } 651 652 static int 653 tmpfs_write(struct vop_write_args *v) 654 { 655 struct vnode *vp = v->a_vp; 656 struct uio *uio = v->a_uio; 657 int ioflag = v->a_ioflag; 658 struct thread *td = uio->uio_td; 659 660 boolean_t extended; 661 int error = 0; 662 off_t oldsize; 663 struct tmpfs_node *node; 664 vm_object_t uobj; 665 size_t len; 666 int resid; 667 668 node = VP_TO_TMPFS_NODE(vp); 669 oldsize = node->tn_size; 670 671 if (uio->uio_offset < 0 || vp->v_type != VREG) { 672 error = EINVAL; 673 goto out; 674 } 675 676 if (uio->uio_resid == 0) { 677 error = 0; 678 goto out; 679 } 680 681 if (ioflag & IO_APPEND) 682 uio->uio_offset = node->tn_size; 683 684 if (uio->uio_offset + uio->uio_resid > 685 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 686 return (EFBIG); 687 688 if (vp->v_type == VREG && td != NULL) { 689 PROC_LOCK(td->td_proc); 690 if (uio->uio_offset + uio->uio_resid > 691 lim_cur(td->td_proc, RLIMIT_FSIZE)) { 692 psignal(td->td_proc, SIGXFSZ); 693 PROC_UNLOCK(td->td_proc); 694 return (EFBIG); 695 } 696 PROC_UNLOCK(td->td_proc); 697 } 698 699 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 700 if (extended) { 701 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 702 if (error != 0) 703 goto out; 704 } 705 706 uobj = node->tn_reg.tn_aobj; 707 while ((resid = uio->uio_resid) > 0) { 708 if (node->tn_size <= uio->uio_offset) 709 break; 710 len = MIN(node->tn_size - uio->uio_offset, resid); 711 if (len == 0) 712 break; 713 error = tmpfs_mappedwrite(vp->v_object, uobj, len, uio); 714 if ((error != 0) || (resid == uio->uio_resid)) 715 break; 716 } 717 718 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 719 (extended ? TMPFS_NODE_CHANGED : 0); 720 721 if (node->tn_mode & (S_ISUID | S_ISGID)) { 722 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 723 node->tn_mode &= ~(S_ISUID | S_ISGID); 724 } 725 726 if (error != 0) 727 (void)tmpfs_reg_resize(vp, oldsize); 728 729 out: 730 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 731 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 732 733 return error; 734 } 735 736 /* --------------------------------------------------------------------- */ 737 738 static int 739 tmpfs_fsync(struct vop_fsync_args *v) 740 { 741 struct vnode *vp = v->a_vp; 742 743 MPASS(VOP_ISLOCKED(vp)); 744 745 tmpfs_update(vp); 746 747 return 0; 748 } 749 750 /* --------------------------------------------------------------------- */ 751 752 static int 753 tmpfs_remove(struct vop_remove_args *v) 754 { 755 struct vnode *dvp = v->a_dvp; 756 struct vnode *vp = v->a_vp; 757 758 int error; 759 struct tmpfs_dirent *de; 760 struct tmpfs_mount *tmp; 761 struct tmpfs_node *dnode; 762 struct tmpfs_node *node; 763 764 MPASS(VOP_ISLOCKED(dvp)); 765 MPASS(VOP_ISLOCKED(vp)); 766 767 if (vp->v_type == VDIR) { 768 error = EISDIR; 769 goto out; 770 } 771 772 dnode = VP_TO_TMPFS_DIR(dvp); 773 node = VP_TO_TMPFS_NODE(vp); 774 tmp = VFS_TO_TMPFS(vp->v_mount); 775 de = tmpfs_dir_search(dnode, node); 776 MPASS(de != NULL); 777 778 /* Files marked as immutable or append-only cannot be deleted. */ 779 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 780 (dnode->tn_flags & APPEND)) { 781 error = EPERM; 782 goto out; 783 } 784 785 /* Remove the entry from the directory; as it is a file, we do not 786 * have to change the number of hard links of the directory. */ 787 tmpfs_dir_detach(dvp, de); 788 789 /* Free the directory entry we just deleted. Note that the node 790 * referred by it will not be removed until the vnode is really 791 * reclaimed. */ 792 tmpfs_free_dirent(tmp, de, TRUE); 793 794 if (node->tn_links > 0) 795 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 796 TMPFS_NODE_MODIFIED; 797 error = 0; 798 799 out: 800 801 return error; 802 } 803 804 /* --------------------------------------------------------------------- */ 805 806 static int 807 tmpfs_link(struct vop_link_args *v) 808 { 809 struct vnode *dvp = v->a_tdvp; 810 struct vnode *vp = v->a_vp; 811 struct componentname *cnp = v->a_cnp; 812 813 int error; 814 struct tmpfs_dirent *de; 815 struct tmpfs_node *node; 816 817 MPASS(VOP_ISLOCKED(dvp)); 818 MPASS(cnp->cn_flags & HASBUF); 819 MPASS(dvp != vp); /* XXX When can this be false? */ 820 821 node = VP_TO_TMPFS_NODE(vp); 822 823 /* XXX: Why aren't the following two tests done by the caller? */ 824 825 /* Hard links of directories are forbidden. */ 826 if (vp->v_type == VDIR) { 827 error = EPERM; 828 goto out; 829 } 830 831 /* Cannot create cross-device links. */ 832 if (dvp->v_mount != vp->v_mount) { 833 error = EXDEV; 834 goto out; 835 } 836 837 /* Ensure that we do not overflow the maximum number of links imposed 838 * by the system. */ 839 MPASS(node->tn_links <= LINK_MAX); 840 if (node->tn_links == LINK_MAX) { 841 error = EMLINK; 842 goto out; 843 } 844 845 /* We cannot create links of files marked immutable or append-only. */ 846 if (node->tn_flags & (IMMUTABLE | APPEND)) { 847 error = EPERM; 848 goto out; 849 } 850 851 /* Allocate a new directory entry to represent the node. */ 852 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 853 cnp->cn_nameptr, cnp->cn_namelen, &de); 854 if (error != 0) 855 goto out; 856 857 /* Insert the new directory entry into the appropriate directory. */ 858 tmpfs_dir_attach(dvp, de); 859 860 /* vp link count has changed, so update node times. */ 861 node->tn_status |= TMPFS_NODE_CHANGED; 862 tmpfs_update(vp); 863 864 error = 0; 865 866 out: 867 return error; 868 } 869 870 /* --------------------------------------------------------------------- */ 871 872 static int 873 tmpfs_rename(struct vop_rename_args *v) 874 { 875 struct vnode *fdvp = v->a_fdvp; 876 struct vnode *fvp = v->a_fvp; 877 struct componentname *fcnp = v->a_fcnp; 878 struct vnode *tdvp = v->a_tdvp; 879 struct vnode *tvp = v->a_tvp; 880 struct componentname *tcnp = v->a_tcnp; 881 882 char *newname; 883 int error; 884 struct tmpfs_dirent *de; 885 struct tmpfs_node *fdnode; 886 struct tmpfs_node *fnode; 887 struct tmpfs_node *tnode; 888 struct tmpfs_node *tdnode; 889 890 MPASS(VOP_ISLOCKED(tdvp)); 891 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 892 MPASS(fcnp->cn_flags & HASBUF); 893 MPASS(tcnp->cn_flags & HASBUF); 894 895 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 896 897 /* Disallow cross-device renames. 898 * XXX Why isn't this done by the caller? */ 899 if (fvp->v_mount != tdvp->v_mount || 900 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 901 error = EXDEV; 902 goto out; 903 } 904 905 tdnode = VP_TO_TMPFS_DIR(tdvp); 906 907 /* If source and target are the same file, there is nothing to do. */ 908 if (fvp == tvp) { 909 error = 0; 910 goto out; 911 } 912 913 /* If we need to move the directory between entries, lock the 914 * source so that we can safely operate on it. */ 915 if (tdvp != fdvp) { 916 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 917 if (error != 0) 918 goto out; 919 } 920 fdnode = VP_TO_TMPFS_DIR(fdvp); 921 fnode = VP_TO_TMPFS_NODE(fvp); 922 de = tmpfs_dir_search(fdnode, fnode); 923 924 /* Avoid manipulating '.' and '..' entries. */ 925 if (de == NULL) { 926 MPASS(fvp->v_type == VDIR); 927 error = EINVAL; 928 goto out_locked; 929 } 930 MPASS(de->td_node == fnode); 931 932 /* If re-naming a directory to another preexisting directory 933 * ensure that the target directory is empty so that its 934 * removal causes no side effects. 935 * Kern_rename gurantees the destination to be a directory 936 * if the source is one. */ 937 if (tvp != NULL) { 938 MPASS(tnode != NULL); 939 940 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 941 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 942 error = EPERM; 943 goto out_locked; 944 } 945 946 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 947 if (tnode->tn_size > 0) { 948 error = ENOTEMPTY; 949 goto out_locked; 950 } 951 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 952 error = ENOTDIR; 953 goto out_locked; 954 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 955 error = EISDIR; 956 goto out_locked; 957 } else { 958 MPASS(fnode->tn_type != VDIR && 959 tnode->tn_type != VDIR); 960 } 961 } 962 963 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 964 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 965 error = EPERM; 966 goto out_locked; 967 } 968 969 /* Ensure that we have enough memory to hold the new name, if it 970 * has to be changed. */ 971 if (fcnp->cn_namelen != tcnp->cn_namelen || 972 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 973 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 974 } else 975 newname = NULL; 976 977 /* If the node is being moved to another directory, we have to do 978 * the move. */ 979 if (fdnode != tdnode) { 980 /* In case we are moving a directory, we have to adjust its 981 * parent to point to the new parent. */ 982 if (de->td_node->tn_type == VDIR) { 983 struct tmpfs_node *n; 984 985 /* Ensure the target directory is not a child of the 986 * directory being moved. Otherwise, we'd end up 987 * with stale nodes. */ 988 n = tdnode; 989 while (n != n->tn_dir.tn_parent) { 990 if (n == fnode) { 991 error = EINVAL; 992 if (newname != NULL) 993 free(newname, M_TMPFSNAME); 994 goto out_locked; 995 } 996 n = n->tn_dir.tn_parent; 997 } 998 999 /* Adjust the parent pointer. */ 1000 TMPFS_VALIDATE_DIR(fnode); 1001 de->td_node->tn_dir.tn_parent = tdnode; 1002 1003 /* As a result of changing the target of the '..' 1004 * entry, the link count of the source and target 1005 * directories has to be adjusted. */ 1006 fdnode->tn_links--; 1007 tdnode->tn_links++; 1008 } 1009 1010 /* Do the move: just remove the entry from the source directory 1011 * and insert it into the target one. */ 1012 tmpfs_dir_detach(fdvp, de); 1013 tmpfs_dir_attach(tdvp, de); 1014 } 1015 1016 /* If the name has changed, we need to make it effective by changing 1017 * it in the directory entry. */ 1018 if (newname != NULL) { 1019 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1020 1021 free(de->td_name, M_TMPFSNAME); 1022 de->td_namelen = (uint16_t)tcnp->cn_namelen; 1023 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 1024 de->td_name = newname; 1025 1026 fnode->tn_status |= TMPFS_NODE_CHANGED; 1027 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1028 } 1029 1030 /* If we are overwriting an entry, we have to remove the old one 1031 * from the target directory. */ 1032 if (tvp != NULL) { 1033 /* Remove the old entry from the target directory. */ 1034 de = tmpfs_dir_search(tdnode, tnode); 1035 tmpfs_dir_detach(tdvp, de); 1036 1037 /* Free the directory entry we just deleted. Note that the 1038 * node referred by it will not be removed until the vnode is 1039 * really reclaimed. */ 1040 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 1041 } 1042 1043 error = 0; 1044 1045 out_locked: 1046 if (fdnode != tdnode) 1047 VOP_UNLOCK(fdvp, 0); 1048 1049 out: 1050 /* Release target nodes. */ 1051 /* XXX: I don't understand when tdvp can be the same as tvp, but 1052 * other code takes care of this... */ 1053 if (tdvp == tvp) 1054 vrele(tdvp); 1055 else 1056 vput(tdvp); 1057 if (tvp != NULL) 1058 vput(tvp); 1059 1060 /* Release source nodes. */ 1061 vrele(fdvp); 1062 vrele(fvp); 1063 1064 return error; 1065 } 1066 1067 /* --------------------------------------------------------------------- */ 1068 1069 static int 1070 tmpfs_mkdir(struct vop_mkdir_args *v) 1071 { 1072 struct vnode *dvp = v->a_dvp; 1073 struct vnode **vpp = v->a_vpp; 1074 struct componentname *cnp = v->a_cnp; 1075 struct vattr *vap = v->a_vap; 1076 1077 MPASS(vap->va_type == VDIR); 1078 1079 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1080 } 1081 1082 /* --------------------------------------------------------------------- */ 1083 1084 static int 1085 tmpfs_rmdir(struct vop_rmdir_args *v) 1086 { 1087 struct vnode *dvp = v->a_dvp; 1088 struct vnode *vp = v->a_vp; 1089 1090 int error; 1091 struct tmpfs_dirent *de; 1092 struct tmpfs_mount *tmp; 1093 struct tmpfs_node *dnode; 1094 struct tmpfs_node *node; 1095 1096 MPASS(VOP_ISLOCKED(dvp)); 1097 MPASS(VOP_ISLOCKED(vp)); 1098 1099 tmp = VFS_TO_TMPFS(dvp->v_mount); 1100 dnode = VP_TO_TMPFS_DIR(dvp); 1101 node = VP_TO_TMPFS_DIR(vp); 1102 1103 /* Directories with more than two entries ('.' and '..') cannot be 1104 * removed. */ 1105 if (node->tn_size > 0) { 1106 error = ENOTEMPTY; 1107 goto out; 1108 } 1109 1110 if ((dnode->tn_flags & APPEND) 1111 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1112 error = EPERM; 1113 goto out; 1114 } 1115 1116 /* This invariant holds only if we are not trying to remove "..". 1117 * We checked for that above so this is safe now. */ 1118 MPASS(node->tn_dir.tn_parent == dnode); 1119 1120 /* Get the directory entry associated with node (vp). This was 1121 * filled by tmpfs_lookup while looking up the entry. */ 1122 de = tmpfs_dir_search(dnode, node); 1123 MPASS(TMPFS_DIRENT_MATCHES(de, 1124 v->a_cnp->cn_nameptr, 1125 v->a_cnp->cn_namelen)); 1126 1127 /* Check flags to see if we are allowed to remove the directory. */ 1128 if (dnode->tn_flags & APPEND 1129 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1130 error = EPERM; 1131 goto out; 1132 } 1133 1134 /* Detach the directory entry from the directory (dnode). */ 1135 tmpfs_dir_detach(dvp, de); 1136 1137 node->tn_links--; 1138 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1139 TMPFS_NODE_MODIFIED; 1140 node->tn_dir.tn_parent->tn_links--; 1141 node->tn_dir.tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1142 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1143 1144 cache_purge(dvp); 1145 cache_purge(vp); 1146 1147 /* Free the directory entry we just deleted. Note that the node 1148 * referred by it will not be removed until the vnode is really 1149 * reclaimed. */ 1150 tmpfs_free_dirent(tmp, de, TRUE); 1151 1152 /* Release the deleted vnode (will destroy the node, notify 1153 * interested parties and clean it from the cache). */ 1154 1155 dnode->tn_status |= TMPFS_NODE_CHANGED; 1156 tmpfs_update(dvp); 1157 1158 error = 0; 1159 1160 out: 1161 return error; 1162 } 1163 1164 /* --------------------------------------------------------------------- */ 1165 1166 static int 1167 tmpfs_symlink(struct vop_symlink_args *v) 1168 { 1169 struct vnode *dvp = v->a_dvp; 1170 struct vnode **vpp = v->a_vpp; 1171 struct componentname *cnp = v->a_cnp; 1172 struct vattr *vap = v->a_vap; 1173 char *target = v->a_target; 1174 1175 #ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1176 MPASS(vap->va_type == VLNK); 1177 #else 1178 vap->va_type = VLNK; 1179 #endif 1180 1181 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1182 } 1183 1184 /* --------------------------------------------------------------------- */ 1185 1186 static int 1187 tmpfs_readdir(struct vop_readdir_args *v) 1188 { 1189 struct vnode *vp = v->a_vp; 1190 struct uio *uio = v->a_uio; 1191 int *eofflag = v->a_eofflag; 1192 u_long **cookies = v->a_cookies; 1193 int *ncookies = v->a_ncookies; 1194 1195 int error; 1196 off_t startoff; 1197 off_t cnt = 0; 1198 struct tmpfs_node *node; 1199 1200 /* This operation only makes sense on directory nodes. */ 1201 if (vp->v_type != VDIR) 1202 return ENOTDIR; 1203 1204 node = VP_TO_TMPFS_DIR(vp); 1205 1206 startoff = uio->uio_offset; 1207 1208 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1209 error = tmpfs_dir_getdotdent(node, uio); 1210 if (error != 0) 1211 goto outok; 1212 cnt++; 1213 } 1214 1215 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1216 error = tmpfs_dir_getdotdotdent(node, uio); 1217 if (error != 0) 1218 goto outok; 1219 cnt++; 1220 } 1221 1222 error = tmpfs_dir_getdents(node, uio, &cnt); 1223 1224 outok: 1225 MPASS(error >= -1); 1226 1227 if (error == -1) 1228 error = 0; 1229 1230 if (eofflag != NULL) 1231 *eofflag = 1232 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1233 1234 /* Update NFS-related variables. */ 1235 if (error == 0 && cookies != NULL && ncookies != NULL) { 1236 off_t i; 1237 off_t off = startoff; 1238 struct tmpfs_dirent *de = NULL; 1239 1240 *ncookies = cnt; 1241 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1242 1243 for (i = 0; i < cnt; i++) { 1244 MPASS(off != TMPFS_DIRCOOKIE_EOF); 1245 if (off == TMPFS_DIRCOOKIE_DOT) { 1246 off = TMPFS_DIRCOOKIE_DOTDOT; 1247 } else { 1248 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1249 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead); 1250 } else if (de != NULL) { 1251 de = TAILQ_NEXT(de, td_entries); 1252 } else { 1253 de = tmpfs_dir_lookupbycookie(node, 1254 off); 1255 MPASS(de != NULL); 1256 de = TAILQ_NEXT(de, td_entries); 1257 } 1258 if (de == NULL) 1259 off = TMPFS_DIRCOOKIE_EOF; 1260 else 1261 off = tmpfs_dircookie(de); 1262 } 1263 1264 (*cookies)[i] = off; 1265 } 1266 MPASS(uio->uio_offset == off); 1267 } 1268 1269 return error; 1270 } 1271 1272 /* --------------------------------------------------------------------- */ 1273 1274 static int 1275 tmpfs_readlink(struct vop_readlink_args *v) 1276 { 1277 struct vnode *vp = v->a_vp; 1278 struct uio *uio = v->a_uio; 1279 1280 int error; 1281 struct tmpfs_node *node; 1282 1283 MPASS(uio->uio_offset == 0); 1284 MPASS(vp->v_type == VLNK); 1285 1286 node = VP_TO_TMPFS_NODE(vp); 1287 1288 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1289 uio); 1290 node->tn_status |= TMPFS_NODE_ACCESSED; 1291 1292 return error; 1293 } 1294 1295 /* --------------------------------------------------------------------- */ 1296 1297 static int 1298 tmpfs_inactive(struct vop_inactive_args *v) 1299 { 1300 struct vnode *vp = v->a_vp; 1301 struct thread *l = v->a_td; 1302 1303 struct tmpfs_node *node; 1304 1305 MPASS(VOP_ISLOCKED(vp)); 1306 1307 node = VP_TO_TMPFS_NODE(vp); 1308 1309 if (node->tn_links == 0) 1310 vrecycle(vp, l); 1311 1312 return 0; 1313 } 1314 1315 /* --------------------------------------------------------------------- */ 1316 1317 int 1318 tmpfs_reclaim(struct vop_reclaim_args *v) 1319 { 1320 struct vnode *vp = v->a_vp; 1321 1322 struct tmpfs_mount *tmp; 1323 struct tmpfs_node *node; 1324 1325 node = VP_TO_TMPFS_NODE(vp); 1326 tmp = VFS_TO_TMPFS(vp->v_mount); 1327 1328 vnode_destroy_vobject(vp); 1329 cache_purge(vp); 1330 tmpfs_free_vp(vp); 1331 1332 /* If the node referenced by this vnode was deleted by the user, 1333 * we must free its associated data structures (now that the vnode 1334 * is being reclaimed). */ 1335 if (node->tn_links == 0) 1336 tmpfs_free_node(tmp, node); 1337 1338 MPASS(vp->v_data == NULL); 1339 return 0; 1340 } 1341 1342 /* --------------------------------------------------------------------- */ 1343 1344 static int 1345 tmpfs_print(struct vop_print_args *v) 1346 { 1347 struct vnode *vp = v->a_vp; 1348 1349 struct tmpfs_node *node; 1350 1351 node = VP_TO_TMPFS_NODE(vp); 1352 1353 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1354 node, node->tn_flags, node->tn_links); 1355 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1356 ", status 0x%x\n", 1357 node->tn_mode, node->tn_uid, node->tn_gid, 1358 (uintmax_t)node->tn_size, node->tn_status); 1359 1360 if (vp->v_type == VFIFO) 1361 fifo_printinfo(vp); 1362 1363 printf("\n"); 1364 1365 return 0; 1366 } 1367 1368 /* --------------------------------------------------------------------- */ 1369 1370 static int 1371 tmpfs_pathconf(struct vop_pathconf_args *v) 1372 { 1373 int name = v->a_name; 1374 register_t *retval = v->a_retval; 1375 1376 int error; 1377 1378 error = 0; 1379 1380 switch (name) { 1381 case _PC_LINK_MAX: 1382 *retval = LINK_MAX; 1383 break; 1384 1385 case _PC_NAME_MAX: 1386 *retval = NAME_MAX; 1387 break; 1388 1389 case _PC_PATH_MAX: 1390 *retval = PATH_MAX; 1391 break; 1392 1393 case _PC_PIPE_BUF: 1394 *retval = PIPE_BUF; 1395 break; 1396 1397 case _PC_CHOWN_RESTRICTED: 1398 *retval = 1; 1399 break; 1400 1401 case _PC_NO_TRUNC: 1402 *retval = 1; 1403 break; 1404 1405 case _PC_SYNC_IO: 1406 *retval = 1; 1407 break; 1408 1409 case _PC_FILESIZEBITS: 1410 *retval = 0; /* XXX Don't know which value should I return. */ 1411 break; 1412 1413 default: 1414 error = EINVAL; 1415 } 1416 1417 return error; 1418 } 1419 1420 static int 1421 tmpfs_vptofh(struct vop_vptofh_args *ap) 1422 { 1423 struct tmpfs_fid *tfhp; 1424 struct tmpfs_node *node; 1425 1426 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1427 node = VP_TO_TMPFS_NODE(ap->a_vp); 1428 1429 tfhp->tf_len = sizeof(struct tmpfs_fid); 1430 tfhp->tf_id = node->tn_id; 1431 tfhp->tf_gen = node->tn_gen; 1432 1433 return (0); 1434 } 1435 1436 /* --------------------------------------------------------------------- */ 1437 1438 /* 1439 * vnode operations vector used for files stored in a tmpfs file system. 1440 */ 1441 struct vop_vector tmpfs_vnodeop_entries = { 1442 .vop_default = &default_vnodeops, 1443 .vop_lookup = vfs_cache_lookup, 1444 .vop_cachedlookup = tmpfs_lookup, 1445 .vop_create = tmpfs_create, 1446 .vop_mknod = tmpfs_mknod, 1447 .vop_open = tmpfs_open, 1448 .vop_close = tmpfs_close, 1449 .vop_access = tmpfs_access, 1450 .vop_getattr = tmpfs_getattr, 1451 .vop_setattr = tmpfs_setattr, 1452 .vop_read = tmpfs_read, 1453 .vop_write = tmpfs_write, 1454 .vop_fsync = tmpfs_fsync, 1455 .vop_remove = tmpfs_remove, 1456 .vop_link = tmpfs_link, 1457 .vop_rename = tmpfs_rename, 1458 .vop_mkdir = tmpfs_mkdir, 1459 .vop_rmdir = tmpfs_rmdir, 1460 .vop_symlink = tmpfs_symlink, 1461 .vop_readdir = tmpfs_readdir, 1462 .vop_readlink = tmpfs_readlink, 1463 .vop_inactive = tmpfs_inactive, 1464 .vop_reclaim = tmpfs_reclaim, 1465 .vop_print = tmpfs_print, 1466 .vop_pathconf = tmpfs_pathconf, 1467 .vop_vptofh = tmpfs_vptofh, 1468 .vop_bmap = VOP_EOPNOTSUPP, 1469 }; 1470 1471