tmpfs_vnops.c revision 182739
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: head/sys/fs/tmpfs/tmpfs_vnops.c 182739 2008-09-03 18:53:48Z delphij $"); 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 65static int 66tmpfs_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 185out: 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 195static int 196tmpfs_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 209static int 210tmpfs_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 226static int 227tmpfs_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 259static int 260tmpfs_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 281int 282tmpfs_access(struct vop_access_args *v) 283{ 284 struct vnode *vp = v->a_vp; 285 int mode = v->a_mode; 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 (mode & 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 (mode & 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, mode, cred, NULL); 328 329out: 330 MPASS(VOP_ISLOCKED(vp)); 331 332 return error; 333} 334 335/* --------------------------------------------------------------------- */ 336 337int 338tmpfs_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 VATTR_NULL(vap); 348 349 tmpfs_update(vp); 350 351 vap->va_type = vp->v_type; 352 vap->va_mode = node->tn_mode; 353 vap->va_nlink = node->tn_links; 354 vap->va_uid = node->tn_uid; 355 vap->va_gid = node->tn_gid; 356 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 357 vap->va_fileid = node->tn_id; 358 vap->va_size = node->tn_size; 359 vap->va_blocksize = PAGE_SIZE; 360 vap->va_atime = node->tn_atime; 361 vap->va_mtime = node->tn_mtime; 362 vap->va_ctime = node->tn_ctime; 363 vap->va_birthtime = node->tn_birthtime; 364 vap->va_gen = node->tn_gen; 365 vap->va_flags = node->tn_flags; 366 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 367 node->tn_rdev : VNOVAL; 368 vap->va_bytes = round_page(node->tn_size); 369 vap->va_filerev = VNOVAL; 370 vap->va_vaflags = 0; 371 vap->va_spare = VNOVAL; /* XXX */ 372 373 return 0; 374} 375 376/* --------------------------------------------------------------------- */ 377 378/* XXX Should this operation be atomic? I think it should, but code in 379 * XXX other places (e.g., ufs) doesn't seem to be... */ 380int 381tmpfs_setattr(struct vop_setattr_args *v) 382{ 383 struct vnode *vp = v->a_vp; 384 struct vattr *vap = v->a_vap; 385 struct ucred *cred = v->a_cred; 386 struct thread *td = curthread; 387 388 int error; 389 390 MPASS(VOP_ISLOCKED(vp)); 391 392 error = 0; 393 394 /* Abort if any unsettable attribute is given. */ 395 if (vap->va_type != VNON || 396 vap->va_nlink != VNOVAL || 397 vap->va_fsid != VNOVAL || 398 vap->va_fileid != VNOVAL || 399 vap->va_blocksize != VNOVAL || 400 vap->va_gen != VNOVAL || 401 vap->va_rdev != VNOVAL || 402 vap->va_bytes != VNOVAL) 403 error = EINVAL; 404 405 if (error == 0 && (vap->va_flags != VNOVAL)) 406 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 407 408 if (error == 0 && (vap->va_size != VNOVAL)) 409 error = tmpfs_chsize(vp, vap->va_size, cred, td); 410 411 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 412 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 413 414 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 415 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 416 417 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 418 vap->va_atime.tv_nsec != VNOVAL) || 419 (vap->va_mtime.tv_sec != VNOVAL && 420 vap->va_mtime.tv_nsec != VNOVAL) || 421 (vap->va_birthtime.tv_sec != VNOVAL && 422 vap->va_birthtime.tv_nsec != VNOVAL))) 423 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 424 &vap->va_birthtime, vap->va_vaflags, cred, td); 425 426 /* Update the node times. We give preference to the error codes 427 * generated by this function rather than the ones that may arise 428 * from tmpfs_update. */ 429 tmpfs_update(vp); 430 431 MPASS(VOP_ISLOCKED(vp)); 432 433 return error; 434} 435 436/* --------------------------------------------------------------------- */ 437 438static int 439tmpfs_mappedread(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 440{ 441 vm_pindex_t idx; 442 vm_page_t m; 443 struct sf_buf *sf; 444 off_t offset, addr; 445 size_t tlen; 446 caddr_t va; 447 int error; 448 449 addr = uio->uio_offset; 450 idx = OFF_TO_IDX(addr); 451 offset = addr & PAGE_MASK; 452 tlen = MIN(PAGE_SIZE - offset, len); 453 454 if ((vobj == NULL) || (vobj->resident_page_count == 0)) 455 goto nocache; 456 457 VM_OBJECT_LOCK(vobj); 458lookupvpg: 459 if (((m = vm_page_lookup(vobj, idx)) != NULL) && 460 vm_page_is_valid(m, offset, tlen)) { 461 if (vm_page_sleep_if_busy(m, FALSE, "tmfsmr")) 462 goto lookupvpg; 463 vm_page_busy(m); 464 VM_OBJECT_UNLOCK(vobj); 465 sched_pin(); 466 sf = sf_buf_alloc(m, SFB_CPUPRIVATE); 467 va = (caddr_t)sf_buf_kva(sf); 468 error = uiomove(va + offset, tlen, uio); 469 sf_buf_free(sf); 470 sched_unpin(); 471 VM_OBJECT_LOCK(vobj); 472 vm_page_wakeup(m); 473 VM_OBJECT_UNLOCK(vobj); 474 return (error); 475 } 476 VM_OBJECT_UNLOCK(vobj); 477nocache: 478 VM_OBJECT_LOCK(tobj); 479 vm_object_pip_add(tobj, 1); 480 m = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 481 VM_ALLOC_ZERO | VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 482 if (m->valid != VM_PAGE_BITS_ALL) { 483 int behind, ahead; 484 if (vm_pager_has_page(tobj, idx, &behind, &ahead)) { 485 error = vm_pager_get_pages(tobj, &m, 1, 0); 486 if (error != 0) { 487 printf("tmpfs get pages from pager error [read]\n"); 488 goto out; 489 } 490 } else 491 vm_page_zero_invalid(m, TRUE); 492 } 493 VM_OBJECT_UNLOCK(tobj); 494 sched_pin(); 495 sf = sf_buf_alloc(m, SFB_CPUPRIVATE); 496 va = (caddr_t)sf_buf_kva(sf); 497 error = uiomove(va + offset, tlen, uio); 498 sf_buf_free(sf); 499 sched_unpin(); 500 VM_OBJECT_LOCK(tobj); 501out: 502 vm_page_lock_queues(); 503 vm_page_unwire(m, 0); 504 vm_page_activate(m); 505 vm_page_unlock_queues(); 506 vm_page_wakeup(m); 507 vm_object_pip_subtract(tobj, 1); 508 VM_OBJECT_UNLOCK(tobj); 509 510 return (error); 511} 512 513static int 514tmpfs_read(struct vop_read_args *v) 515{ 516 struct vnode *vp = v->a_vp; 517 struct uio *uio = v->a_uio; 518 519 struct tmpfs_node *node; 520 vm_object_t uobj; 521 size_t len; 522 int resid; 523 524 int error = 0; 525 526 node = VP_TO_TMPFS_NODE(vp); 527 528 if (vp->v_type != VREG) { 529 error = EISDIR; 530 goto out; 531 } 532 533 if (uio->uio_offset < 0) { 534 error = EINVAL; 535 goto out; 536 } 537 538 node->tn_status |= TMPFS_NODE_ACCESSED; 539 540 uobj = node->tn_reg.tn_aobj; 541 while ((resid = uio->uio_resid) > 0) { 542 error = 0; 543 if (node->tn_size <= uio->uio_offset) 544 break; 545 len = MIN(node->tn_size - uio->uio_offset, resid); 546 if (len == 0) 547 break; 548 error = tmpfs_mappedread(vp->v_object, uobj, len, uio); 549 if ((error != 0) || (resid == uio->uio_resid)) 550 break; 551 } 552 553out: 554 555 return error; 556} 557 558/* --------------------------------------------------------------------- */ 559 560static int 561tmpfs_mappedwrite(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 562{ 563 vm_pindex_t idx; 564 vm_page_t vpg, tpg; 565 struct sf_buf *sf; 566 off_t offset, addr; 567 size_t tlen; 568 caddr_t va; 569 int error; 570 571 error = 0; 572 573 addr = uio->uio_offset; 574 idx = OFF_TO_IDX(addr); 575 offset = addr & PAGE_MASK; 576 tlen = MIN(PAGE_SIZE - offset, len); 577 578 if ((vobj == NULL) || (vobj->resident_page_count == 0)) { 579 vpg = NULL; 580 goto nocache; 581 } 582 583 VM_OBJECT_LOCK(vobj); 584lookupvpg: 585 if (((vpg = vm_page_lookup(vobj, idx)) != NULL) && 586 vm_page_is_valid(vpg, offset, tlen)) { 587 if (vm_page_sleep_if_busy(vpg, FALSE, "tmfsmw")) 588 goto lookupvpg; 589 vm_page_busy(vpg); 590 vm_page_lock_queues(); 591 vm_page_undirty(vpg); 592 vm_page_unlock_queues(); 593 VM_OBJECT_UNLOCK(vobj); 594 sched_pin(); 595 sf = sf_buf_alloc(vpg, SFB_CPUPRIVATE); 596 va = (caddr_t)sf_buf_kva(sf); 597 error = uiomove(va + offset, tlen, uio); 598 sf_buf_free(sf); 599 sched_unpin(); 600 } else { 601 VM_OBJECT_UNLOCK(vobj); 602 vpg = NULL; 603 } 604nocache: 605 VM_OBJECT_LOCK(tobj); 606 vm_object_pip_add(tobj, 1); 607 tpg = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 608 VM_ALLOC_ZERO | VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 609 if (tpg->valid != VM_PAGE_BITS_ALL) { 610 int behind, ahead; 611 if (vm_pager_has_page(tobj, idx, &behind, &ahead)) { 612 error = vm_pager_get_pages(tobj, &tpg, 1, 0); 613 if (error != 0) { 614 printf("tmpfs get pages from pager error [write]\n"); 615 goto out; 616 } 617 } else 618 vm_page_zero_invalid(tpg, TRUE); 619 } 620 VM_OBJECT_UNLOCK(tobj); 621 if (vpg == NULL) { 622 sched_pin(); 623 sf = sf_buf_alloc(tpg, SFB_CPUPRIVATE); 624 va = (caddr_t)sf_buf_kva(sf); 625 error = uiomove(va + offset, tlen, uio); 626 sf_buf_free(sf); 627 sched_unpin(); 628 } else { 629 KASSERT(vpg->valid == VM_PAGE_BITS_ALL, ("parts of vpg invalid")); 630 pmap_copy_page(vpg, tpg); 631 } 632 VM_OBJECT_LOCK(tobj); 633out: 634 if (vobj != NULL) 635 VM_OBJECT_LOCK(vobj); 636 vm_page_lock_queues(); 637 if (error == 0) { 638 vm_page_set_validclean(tpg, offset, tlen); 639 vm_page_zero_invalid(tpg, TRUE); 640 vm_page_dirty(tpg); 641 } 642 vm_page_unwire(tpg, 0); 643 vm_page_activate(tpg); 644 vm_page_unlock_queues(); 645 vm_page_wakeup(tpg); 646 if (vpg != NULL) 647 vm_page_wakeup(vpg); 648 if (vobj != NULL) 649 VM_OBJECT_UNLOCK(vobj); 650 vm_object_pip_subtract(tobj, 1); 651 VM_OBJECT_UNLOCK(tobj); 652 653 return (error); 654} 655 656static int 657tmpfs_write(struct vop_write_args *v) 658{ 659 struct vnode *vp = v->a_vp; 660 struct uio *uio = v->a_uio; 661 int ioflag = v->a_ioflag; 662 struct thread *td = uio->uio_td; 663 664 boolean_t extended; 665 int error = 0; 666 off_t oldsize; 667 struct tmpfs_node *node; 668 vm_object_t uobj; 669 size_t len; 670 int resid; 671 672 node = VP_TO_TMPFS_NODE(vp); 673 oldsize = node->tn_size; 674 675 if (uio->uio_offset < 0 || vp->v_type != VREG) { 676 error = EINVAL; 677 goto out; 678 } 679 680 if (uio->uio_resid == 0) { 681 error = 0; 682 goto out; 683 } 684 685 if (ioflag & IO_APPEND) 686 uio->uio_offset = node->tn_size; 687 688 if (uio->uio_offset + uio->uio_resid > 689 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 690 return (EFBIG); 691 692 if (vp->v_type == VREG && td != NULL) { 693 PROC_LOCK(td->td_proc); 694 if (uio->uio_offset + uio->uio_resid > 695 lim_cur(td->td_proc, RLIMIT_FSIZE)) { 696 psignal(td->td_proc, SIGXFSZ); 697 PROC_UNLOCK(td->td_proc); 698 return (EFBIG); 699 } 700 PROC_UNLOCK(td->td_proc); 701 } 702 703 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 704 if (extended) { 705 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 706 if (error != 0) 707 goto out; 708 } 709 710 uobj = node->tn_reg.tn_aobj; 711 while ((resid = uio->uio_resid) > 0) { 712 if (node->tn_size <= uio->uio_offset) 713 break; 714 len = MIN(node->tn_size - uio->uio_offset, resid); 715 if (len == 0) 716 break; 717 error = tmpfs_mappedwrite(vp->v_object, uobj, len, uio); 718 if ((error != 0) || (resid == uio->uio_resid)) 719 break; 720 } 721 722 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 723 (extended ? TMPFS_NODE_CHANGED : 0); 724 725 if (node->tn_mode & (S_ISUID | S_ISGID)) { 726 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 727 node->tn_mode &= ~(S_ISUID | S_ISGID); 728 } 729 730 if (error != 0) 731 (void)tmpfs_reg_resize(vp, oldsize); 732 733out: 734 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 735 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 736 737 return error; 738} 739 740/* --------------------------------------------------------------------- */ 741 742static int 743tmpfs_fsync(struct vop_fsync_args *v) 744{ 745 struct vnode *vp = v->a_vp; 746 747 MPASS(VOP_ISLOCKED(vp)); 748 749 tmpfs_update(vp); 750 751 return 0; 752} 753 754/* --------------------------------------------------------------------- */ 755 756static int 757tmpfs_remove(struct vop_remove_args *v) 758{ 759 struct vnode *dvp = v->a_dvp; 760 struct vnode *vp = v->a_vp; 761 762 int error; 763 struct tmpfs_dirent *de; 764 struct tmpfs_mount *tmp; 765 struct tmpfs_node *dnode; 766 struct tmpfs_node *node; 767 768 MPASS(VOP_ISLOCKED(dvp)); 769 MPASS(VOP_ISLOCKED(vp)); 770 771 if (vp->v_type == VDIR) { 772 error = EISDIR; 773 goto out; 774 } 775 776 dnode = VP_TO_TMPFS_DIR(dvp); 777 node = VP_TO_TMPFS_NODE(vp); 778 tmp = VFS_TO_TMPFS(vp->v_mount); 779 de = tmpfs_dir_search(dnode, node); 780 MPASS(de != NULL); 781 782 /* Files marked as immutable or append-only cannot be deleted. */ 783 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 784 (dnode->tn_flags & APPEND)) { 785 error = EPERM; 786 goto out; 787 } 788 789 /* Remove the entry from the directory; as it is a file, we do not 790 * have to change the number of hard links of the directory. */ 791 tmpfs_dir_detach(dvp, de); 792 793 /* Free the directory entry we just deleted. Note that the node 794 * referred by it will not be removed until the vnode is really 795 * reclaimed. */ 796 tmpfs_free_dirent(tmp, de, TRUE); 797 798 if (node->tn_links > 0) 799 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 800 TMPFS_NODE_MODIFIED; 801 error = 0; 802 803out: 804 805 return error; 806} 807 808/* --------------------------------------------------------------------- */ 809 810static int 811tmpfs_link(struct vop_link_args *v) 812{ 813 struct vnode *dvp = v->a_tdvp; 814 struct vnode *vp = v->a_vp; 815 struct componentname *cnp = v->a_cnp; 816 817 int error; 818 struct tmpfs_dirent *de; 819 struct tmpfs_node *node; 820 821 MPASS(VOP_ISLOCKED(dvp)); 822 MPASS(cnp->cn_flags & HASBUF); 823 MPASS(dvp != vp); /* XXX When can this be false? */ 824 825 node = VP_TO_TMPFS_NODE(vp); 826 827 /* XXX: Why aren't the following two tests done by the caller? */ 828 829 /* Hard links of directories are forbidden. */ 830 if (vp->v_type == VDIR) { 831 error = EPERM; 832 goto out; 833 } 834 835 /* Cannot create cross-device links. */ 836 if (dvp->v_mount != vp->v_mount) { 837 error = EXDEV; 838 goto out; 839 } 840 841 /* Ensure that we do not overflow the maximum number of links imposed 842 * by the system. */ 843 MPASS(node->tn_links <= LINK_MAX); 844 if (node->tn_links == LINK_MAX) { 845 error = EMLINK; 846 goto out; 847 } 848 849 /* We cannot create links of files marked immutable or append-only. */ 850 if (node->tn_flags & (IMMUTABLE | APPEND)) { 851 error = EPERM; 852 goto out; 853 } 854 855 /* Allocate a new directory entry to represent the node. */ 856 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 857 cnp->cn_nameptr, cnp->cn_namelen, &de); 858 if (error != 0) 859 goto out; 860 861 /* Insert the new directory entry into the appropriate directory. */ 862 tmpfs_dir_attach(dvp, de); 863 864 /* vp link count has changed, so update node times. */ 865 node->tn_status |= TMPFS_NODE_CHANGED; 866 tmpfs_update(vp); 867 868 error = 0; 869 870out: 871 return error; 872} 873 874/* --------------------------------------------------------------------- */ 875 876static int 877tmpfs_rename(struct vop_rename_args *v) 878{ 879 struct vnode *fdvp = v->a_fdvp; 880 struct vnode *fvp = v->a_fvp; 881 struct componentname *fcnp = v->a_fcnp; 882 struct vnode *tdvp = v->a_tdvp; 883 struct vnode *tvp = v->a_tvp; 884 struct componentname *tcnp = v->a_tcnp; 885 886 char *newname; 887 int error; 888 struct tmpfs_dirent *de; 889 struct tmpfs_node *fdnode; 890 struct tmpfs_node *fnode; 891 struct tmpfs_node *tnode; 892 struct tmpfs_node *tdnode; 893 894 MPASS(VOP_ISLOCKED(tdvp)); 895 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 896 MPASS(fcnp->cn_flags & HASBUF); 897 MPASS(tcnp->cn_flags & HASBUF); 898 899 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 900 901 /* Disallow cross-device renames. 902 * XXX Why isn't this done by the caller? */ 903 if (fvp->v_mount != tdvp->v_mount || 904 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 905 error = EXDEV; 906 goto out; 907 } 908 909 tdnode = VP_TO_TMPFS_DIR(tdvp); 910 911 /* If source and target are the same file, there is nothing to do. */ 912 if (fvp == tvp) { 913 error = 0; 914 goto out; 915 } 916 917 /* If we need to move the directory between entries, lock the 918 * source so that we can safely operate on it. */ 919 if (tdvp != fdvp) { 920 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 921 if (error != 0) 922 goto out; 923 } 924 fdnode = VP_TO_TMPFS_DIR(fdvp); 925 fnode = VP_TO_TMPFS_NODE(fvp); 926 de = tmpfs_dir_search(fdnode, fnode); 927 928 /* Avoid manipulating '.' and '..' entries. */ 929 if (de == NULL) { 930 MPASS(fvp->v_type == VDIR); 931 error = EINVAL; 932 goto out_locked; 933 } 934 MPASS(de->td_node == fnode); 935 936 /* If re-naming a directory to another preexisting directory 937 * ensure that the target directory is empty so that its 938 * removal causes no side effects. 939 * Kern_rename gurantees the destination to be a directory 940 * if the source is one. */ 941 if (tvp != NULL) { 942 MPASS(tnode != NULL); 943 944 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 945 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 946 error = EPERM; 947 goto out_locked; 948 } 949 950 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 951 if (tnode->tn_size > 0) { 952 error = ENOTEMPTY; 953 goto out_locked; 954 } 955 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 956 error = ENOTDIR; 957 goto out_locked; 958 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 959 error = EISDIR; 960 goto out_locked; 961 } else { 962 MPASS(fnode->tn_type != VDIR && 963 tnode->tn_type != VDIR); 964 } 965 } 966 967 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 968 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 969 error = EPERM; 970 goto out_locked; 971 } 972 973 /* Ensure that we have enough memory to hold the new name, if it 974 * has to be changed. */ 975 if (fcnp->cn_namelen != tcnp->cn_namelen || 976 memcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 977 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 978 } else 979 newname = NULL; 980 981 /* If the node is being moved to another directory, we have to do 982 * the move. */ 983 if (fdnode != tdnode) { 984 /* In case we are moving a directory, we have to adjust its 985 * parent to point to the new parent. */ 986 if (de->td_node->tn_type == VDIR) { 987 struct tmpfs_node *n; 988 989 /* Ensure the target directory is not a child of the 990 * directory being moved. Otherwise, we'd end up 991 * with stale nodes. */ 992 n = tdnode; 993 while (n != n->tn_dir.tn_parent) { 994 if (n == fnode) { 995 error = EINVAL; 996 if (newname != NULL) 997 free(newname, M_TMPFSNAME); 998 goto out_locked; 999 } 1000 n = n->tn_dir.tn_parent; 1001 } 1002 1003 /* Adjust the parent pointer. */ 1004 TMPFS_VALIDATE_DIR(fnode); 1005 de->td_node->tn_dir.tn_parent = tdnode; 1006 1007 /* As a result of changing the target of the '..' 1008 * entry, the link count of the source and target 1009 * directories has to be adjusted. */ 1010 fdnode->tn_links--; 1011 tdnode->tn_links++; 1012 } 1013 1014 /* Do the move: just remove the entry from the source directory 1015 * and insert it into the target one. */ 1016 tmpfs_dir_detach(fdvp, de); 1017 tmpfs_dir_attach(tdvp, de); 1018 } 1019 1020 /* If the name has changed, we need to make it effective by changing 1021 * it in the directory entry. */ 1022 if (newname != NULL) { 1023 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1024 1025 free(de->td_name, M_TMPFSNAME); 1026 de->td_namelen = (uint16_t)tcnp->cn_namelen; 1027 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 1028 de->td_name = newname; 1029 1030 fnode->tn_status |= TMPFS_NODE_CHANGED; 1031 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1032 } 1033 1034 /* If we are overwriting an entry, we have to remove the old one 1035 * from the target directory. */ 1036 if (tvp != NULL) { 1037 /* Remove the old entry from the target directory. */ 1038 de = tmpfs_dir_search(tdnode, tnode); 1039 tmpfs_dir_detach(tdvp, de); 1040 1041 /* Free the directory entry we just deleted. Note that the 1042 * node referred by it will not be removed until the vnode is 1043 * really reclaimed. */ 1044 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 1045 } 1046 1047 error = 0; 1048 1049out_locked: 1050 if (fdnode != tdnode) 1051 VOP_UNLOCK(fdvp, 0); 1052 1053out: 1054 /* Release target nodes. */ 1055 /* XXX: I don't understand when tdvp can be the same as tvp, but 1056 * other code takes care of this... */ 1057 if (tdvp == tvp) 1058 vrele(tdvp); 1059 else 1060 vput(tdvp); 1061 if (tvp != NULL) 1062 vput(tvp); 1063 1064 /* Release source nodes. */ 1065 vrele(fdvp); 1066 vrele(fvp); 1067 1068 return error; 1069} 1070 1071/* --------------------------------------------------------------------- */ 1072 1073static int 1074tmpfs_mkdir(struct vop_mkdir_args *v) 1075{ 1076 struct vnode *dvp = v->a_dvp; 1077 struct vnode **vpp = v->a_vpp; 1078 struct componentname *cnp = v->a_cnp; 1079 struct vattr *vap = v->a_vap; 1080 1081 MPASS(vap->va_type == VDIR); 1082 1083 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1084} 1085 1086/* --------------------------------------------------------------------- */ 1087 1088static int 1089tmpfs_rmdir(struct vop_rmdir_args *v) 1090{ 1091 struct vnode *dvp = v->a_dvp; 1092 struct vnode *vp = v->a_vp; 1093 1094 int error; 1095 struct tmpfs_dirent *de; 1096 struct tmpfs_mount *tmp; 1097 struct tmpfs_node *dnode; 1098 struct tmpfs_node *node; 1099 1100 MPASS(VOP_ISLOCKED(dvp)); 1101 MPASS(VOP_ISLOCKED(vp)); 1102 1103 tmp = VFS_TO_TMPFS(dvp->v_mount); 1104 dnode = VP_TO_TMPFS_DIR(dvp); 1105 node = VP_TO_TMPFS_DIR(vp); 1106 1107 /* Directories with more than two entries ('.' and '..') cannot be 1108 * removed. */ 1109 if (node->tn_size > 0) { 1110 error = ENOTEMPTY; 1111 goto out; 1112 } 1113 1114 if ((dnode->tn_flags & APPEND) 1115 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1116 error = EPERM; 1117 goto out; 1118 } 1119 1120 /* This invariant holds only if we are not trying to remove "..". 1121 * We checked for that above so this is safe now. */ 1122 MPASS(node->tn_dir.tn_parent == dnode); 1123 1124 /* Get the directory entry associated with node (vp). This was 1125 * filled by tmpfs_lookup while looking up the entry. */ 1126 de = tmpfs_dir_search(dnode, node); 1127 MPASS(TMPFS_DIRENT_MATCHES(de, 1128 v->a_cnp->cn_nameptr, 1129 v->a_cnp->cn_namelen)); 1130 1131 /* Check flags to see if we are allowed to remove the directory. */ 1132 if (dnode->tn_flags & APPEND 1133 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1134 error = EPERM; 1135 goto out; 1136 } 1137 1138 /* Detach the directory entry from the directory (dnode). */ 1139 tmpfs_dir_detach(dvp, de); 1140 1141 node->tn_links--; 1142 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1143 TMPFS_NODE_MODIFIED; 1144 node->tn_dir.tn_parent->tn_links--; 1145 node->tn_dir.tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1146 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1147 1148 cache_purge(dvp); 1149 cache_purge(vp); 1150 1151 /* Free the directory entry we just deleted. Note that the node 1152 * referred by it will not be removed until the vnode is really 1153 * reclaimed. */ 1154 tmpfs_free_dirent(tmp, de, TRUE); 1155 1156 /* Release the deleted vnode (will destroy the node, notify 1157 * interested parties and clean it from the cache). */ 1158 1159 dnode->tn_status |= TMPFS_NODE_CHANGED; 1160 tmpfs_update(dvp); 1161 1162 error = 0; 1163 1164out: 1165 return error; 1166} 1167 1168/* --------------------------------------------------------------------- */ 1169 1170static int 1171tmpfs_symlink(struct vop_symlink_args *v) 1172{ 1173 struct vnode *dvp = v->a_dvp; 1174 struct vnode **vpp = v->a_vpp; 1175 struct componentname *cnp = v->a_cnp; 1176 struct vattr *vap = v->a_vap; 1177 char *target = v->a_target; 1178 1179#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1180 MPASS(vap->va_type == VLNK); 1181#else 1182 vap->va_type = VLNK; 1183#endif 1184 1185 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1186} 1187 1188/* --------------------------------------------------------------------- */ 1189 1190static int 1191tmpfs_readdir(struct vop_readdir_args *v) 1192{ 1193 struct vnode *vp = v->a_vp; 1194 struct uio *uio = v->a_uio; 1195 int *eofflag = v->a_eofflag; 1196 u_long **cookies = v->a_cookies; 1197 int *ncookies = v->a_ncookies; 1198 1199 int error; 1200 off_t startoff; 1201 off_t cnt = 0; 1202 struct tmpfs_node *node; 1203 1204 /* This operation only makes sense on directory nodes. */ 1205 if (vp->v_type != VDIR) 1206 return ENOTDIR; 1207 1208 node = VP_TO_TMPFS_DIR(vp); 1209 1210 startoff = uio->uio_offset; 1211 1212 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1213 error = tmpfs_dir_getdotdent(node, uio); 1214 if (error != 0) 1215 goto outok; 1216 cnt++; 1217 } 1218 1219 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1220 error = tmpfs_dir_getdotdotdent(node, uio); 1221 if (error != 0) 1222 goto outok; 1223 cnt++; 1224 } 1225 1226 error = tmpfs_dir_getdents(node, uio, &cnt); 1227 1228outok: 1229 MPASS(error >= -1); 1230 1231 if (error == -1) 1232 error = 0; 1233 1234 if (eofflag != NULL) 1235 *eofflag = 1236 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1237 1238 /* Update NFS-related variables. */ 1239 if (error == 0 && cookies != NULL && ncookies != NULL) { 1240 off_t i; 1241 off_t off = startoff; 1242 struct tmpfs_dirent *de = NULL; 1243 1244 *ncookies = cnt; 1245 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1246 1247 for (i = 0; i < cnt; i++) { 1248 MPASS(off != TMPFS_DIRCOOKIE_EOF); 1249 if (off == TMPFS_DIRCOOKIE_DOT) { 1250 off = TMPFS_DIRCOOKIE_DOTDOT; 1251 } else { 1252 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1253 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead); 1254 } else if (de != NULL) { 1255 de = TAILQ_NEXT(de, td_entries); 1256 } else { 1257 de = tmpfs_dir_lookupbycookie(node, 1258 off); 1259 MPASS(de != NULL); 1260 de = TAILQ_NEXT(de, td_entries); 1261 } 1262 if (de == NULL) 1263 off = TMPFS_DIRCOOKIE_EOF; 1264 else 1265 off = tmpfs_dircookie(de); 1266 } 1267 1268 (*cookies)[i] = off; 1269 } 1270 MPASS(uio->uio_offset == off); 1271 } 1272 1273 return error; 1274} 1275 1276/* --------------------------------------------------------------------- */ 1277 1278static int 1279tmpfs_readlink(struct vop_readlink_args *v) 1280{ 1281 struct vnode *vp = v->a_vp; 1282 struct uio *uio = v->a_uio; 1283 1284 int error; 1285 struct tmpfs_node *node; 1286 1287 MPASS(uio->uio_offset == 0); 1288 MPASS(vp->v_type == VLNK); 1289 1290 node = VP_TO_TMPFS_NODE(vp); 1291 1292 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1293 uio); 1294 node->tn_status |= TMPFS_NODE_ACCESSED; 1295 1296 return error; 1297} 1298 1299/* --------------------------------------------------------------------- */ 1300 1301static int 1302tmpfs_inactive(struct vop_inactive_args *v) 1303{ 1304 struct vnode *vp = v->a_vp; 1305 struct thread *l = v->a_td; 1306 1307 struct tmpfs_node *node; 1308 1309 MPASS(VOP_ISLOCKED(vp)); 1310 1311 node = VP_TO_TMPFS_NODE(vp); 1312 1313 if (node->tn_links == 0) 1314 vrecycle(vp, l); 1315 1316 return 0; 1317} 1318 1319/* --------------------------------------------------------------------- */ 1320 1321int 1322tmpfs_reclaim(struct vop_reclaim_args *v) 1323{ 1324 struct vnode *vp = v->a_vp; 1325 1326 struct tmpfs_mount *tmp; 1327 struct tmpfs_node *node; 1328 1329 node = VP_TO_TMPFS_NODE(vp); 1330 tmp = VFS_TO_TMPFS(vp->v_mount); 1331 1332 vnode_destroy_vobject(vp); 1333 cache_purge(vp); 1334 tmpfs_free_vp(vp); 1335 1336 /* If the node referenced by this vnode was deleted by the user, 1337 * we must free its associated data structures (now that the vnode 1338 * is being reclaimed). */ 1339 if (node->tn_links == 0) 1340 tmpfs_free_node(tmp, node); 1341 1342 MPASS(vp->v_data == NULL); 1343 return 0; 1344} 1345 1346/* --------------------------------------------------------------------- */ 1347 1348static int 1349tmpfs_print(struct vop_print_args *v) 1350{ 1351 struct vnode *vp = v->a_vp; 1352 1353 struct tmpfs_node *node; 1354 1355 node = VP_TO_TMPFS_NODE(vp); 1356 1357 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1358 node, node->tn_flags, node->tn_links); 1359 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1360 ", status 0x%x\n", 1361 node->tn_mode, node->tn_uid, node->tn_gid, 1362 (uintmax_t)node->tn_size, node->tn_status); 1363 1364 if (vp->v_type == VFIFO) 1365 fifo_printinfo(vp); 1366 1367 printf("\n"); 1368 1369 return 0; 1370} 1371 1372/* --------------------------------------------------------------------- */ 1373 1374static int 1375tmpfs_pathconf(struct vop_pathconf_args *v) 1376{ 1377 int name = v->a_name; 1378 register_t *retval = v->a_retval; 1379 1380 int error; 1381 1382 error = 0; 1383 1384 switch (name) { 1385 case _PC_LINK_MAX: 1386 *retval = LINK_MAX; 1387 break; 1388 1389 case _PC_NAME_MAX: 1390 *retval = NAME_MAX; 1391 break; 1392 1393 case _PC_PATH_MAX: 1394 *retval = PATH_MAX; 1395 break; 1396 1397 case _PC_PIPE_BUF: 1398 *retval = PIPE_BUF; 1399 break; 1400 1401 case _PC_CHOWN_RESTRICTED: 1402 *retval = 1; 1403 break; 1404 1405 case _PC_NO_TRUNC: 1406 *retval = 1; 1407 break; 1408 1409 case _PC_SYNC_IO: 1410 *retval = 1; 1411 break; 1412 1413 case _PC_FILESIZEBITS: 1414 *retval = 0; /* XXX Don't know which value should I return. */ 1415 break; 1416 1417 default: 1418 error = EINVAL; 1419 } 1420 1421 return error; 1422} 1423 1424static int 1425tmpfs_vptofh(struct vop_vptofh_args *ap) 1426{ 1427 struct tmpfs_fid *tfhp; 1428 struct tmpfs_node *node; 1429 1430 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1431 node = VP_TO_TMPFS_NODE(ap->a_vp); 1432 1433 tfhp->tf_len = sizeof(struct tmpfs_fid); 1434 tfhp->tf_id = node->tn_id; 1435 tfhp->tf_gen = node->tn_gen; 1436 1437 return (0); 1438} 1439 1440/* --------------------------------------------------------------------- */ 1441 1442/* 1443 * vnode operations vector used for files stored in a tmpfs file system. 1444 */ 1445struct vop_vector tmpfs_vnodeop_entries = { 1446 .vop_default = &default_vnodeops, 1447 .vop_lookup = vfs_cache_lookup, 1448 .vop_cachedlookup = tmpfs_lookup, 1449 .vop_create = tmpfs_create, 1450 .vop_mknod = tmpfs_mknod, 1451 .vop_open = tmpfs_open, 1452 .vop_close = tmpfs_close, 1453 .vop_access = tmpfs_access, 1454 .vop_getattr = tmpfs_getattr, 1455 .vop_setattr = tmpfs_setattr, 1456 .vop_read = tmpfs_read, 1457 .vop_write = tmpfs_write, 1458 .vop_fsync = tmpfs_fsync, 1459 .vop_remove = tmpfs_remove, 1460 .vop_link = tmpfs_link, 1461 .vop_rename = tmpfs_rename, 1462 .vop_mkdir = tmpfs_mkdir, 1463 .vop_rmdir = tmpfs_rmdir, 1464 .vop_symlink = tmpfs_symlink, 1465 .vop_readdir = tmpfs_readdir, 1466 .vop_readlink = tmpfs_readlink, 1467 .vop_inactive = tmpfs_inactive, 1468 .vop_reclaim = tmpfs_reclaim, 1469 .vop_print = tmpfs_print, 1470 .vop_pathconf = tmpfs_pathconf, 1471 .vop_vptofh = tmpfs_vptofh, 1472 .vop_bmap = VOP_EOPNOTSUPP, 1473}; 1474 1475