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sys/fs/tmpfs/tmpfs_vnops.c
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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, td); 94 vhold(dvp); 95 VOP_UNLOCK(dvp, 0, td); 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, td); 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, NULL, 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, td))); 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, v->a_td)); 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, v->a_td)); 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, v->a_td)); 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 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, v->a_td)); 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); 328 329 out: 330 MPASS(VOP_ISLOCKED(vp, v->a_td)); 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 *l = v->a_td; 383 384 int error; 385 386 MPASS(VOP_ISLOCKED(vp, l)); 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, l); 403 404 if (error == 0 && (vap->va_size != VNOVAL)) 405 error = tmpfs_chsize(vp, vap->va_size, cred, l); 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, 409 l); 410 411 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 412 error = tmpfs_chmod(vp, vap->va_mode, cred, l); 413 414 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 415 vap->va_atime.tv_nsec != VNOVAL) || 416 (vap->va_mtime.tv_sec != VNOVAL && 417 vap->va_mtime.tv_nsec != VNOVAL) || 418 (vap->va_birthtime.tv_sec != VNOVAL && 419 vap->va_birthtime.tv_nsec != VNOVAL))) 420 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 421 &vap->va_birthtime, vap->va_vaflags, cred, l); 422 423 /* Update the node times. We give preference to the error codes 424 * generated by this function rather than the ones that may arise 425 * from tmpfs_update. */ 426 tmpfs_update(vp); 427 428 MPASS(VOP_ISLOCKED(vp, l)); 429 430 return error; 431 } 432 433 /* --------------------------------------------------------------------- */ 434 435 static int 436 tmpfs_mappedread(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 437 { 438 vm_pindex_t idx; 439 vm_page_t m; 440 struct sf_buf *sf; 441 off_t offset, addr; 442 size_t tlen; 443 caddr_t va; 444 int error; 445 446 addr = uio->uio_offset; 447 idx = OFF_TO_IDX(addr); 448 offset = addr & PAGE_MASK; 449 tlen = MIN(PAGE_SIZE - offset, len); 450 451 if ((vobj == NULL) || (vobj->resident_page_count == 0)) 452 goto nocache; 453 454 VM_OBJECT_LOCK(vobj); 455 lookupvpg: 456 if (((m = vm_page_lookup(vobj, idx)) != NULL) && 457 vm_page_is_valid(m, offset, tlen)) { 458 if (vm_page_sleep_if_busy(m, FALSE, "tmfsmr")) 459 goto lookupvpg; 460 vm_page_busy(m); 461 VM_OBJECT_UNLOCK(vobj); 462 sched_pin(); 463 sf = sf_buf_alloc(m, SFB_CPUPRIVATE); 464 va = (caddr_t)sf_buf_kva(sf); 465 error = uiomove(va + offset, tlen, uio); 466 sf_buf_free(sf); 467 sched_unpin(); 468 VM_OBJECT_LOCK(vobj); 469 vm_page_wakeup(m); 470 VM_OBJECT_UNLOCK(vobj); 471 return (error); 472 } 473 VM_OBJECT_UNLOCK(vobj); 474 nocache: 475 VM_OBJECT_LOCK(tobj); 476 vm_object_pip_add(tobj, 1); 477 m = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 478 VM_ALLOC_ZERO | VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 479 if (m->valid != VM_PAGE_BITS_ALL) { 480 int behind, ahead; 481 if (vm_pager_has_page(tobj, idx, &behind, &ahead)) { 482 error = vm_pager_get_pages(tobj, &m, 1, 0); 483 if (error != 0) { 484 printf("tmpfs get pages from pager error [read]\n"); 485 goto out; 486 } 487 } else 488 vm_page_zero_invalid(m, TRUE); 489 } 490 VM_OBJECT_UNLOCK(tobj); 491 sched_pin(); 492 sf = sf_buf_alloc(m, SFB_CPUPRIVATE); 493 va = (caddr_t)sf_buf_kva(sf); 494 error = uiomove(va + offset, tlen, uio); 495 sf_buf_free(sf); 496 sched_unpin(); 497 VM_OBJECT_LOCK(tobj); 498 out: 499 vm_page_lock_queues(); 500 vm_page_unwire(m, 0); 501 vm_page_activate(m); 502 vm_page_unlock_queues(); 503 vm_page_wakeup(m); 504 vm_object_pip_subtract(tobj, 1); 505 VM_OBJECT_UNLOCK(tobj); 506 507 return (error); 508 } 509 510 static int 511 tmpfs_read(struct vop_read_args *v) 512 { 513 struct vnode *vp = v->a_vp; 514 struct uio *uio = v->a_uio; 515 516 struct tmpfs_node *node; 517 vm_object_t uobj; 518 size_t len; 519 int resid; 520 521 int error; 522 523 node = VP_TO_TMPFS_NODE(vp); 524 525 if (vp->v_type != VREG) { 526 error = EISDIR; 527 goto out; 528 } 529 530 if (uio->uio_offset < 0) { 531 error = EINVAL; 532 goto out; 533 } 534 535 node->tn_status |= TMPFS_NODE_ACCESSED; 536 537 uobj = node->tn_reg.tn_aobj; 538 while ((resid = uio->uio_resid) > 0) { 539 error = 0; 540 if (node->tn_size <= uio->uio_offset) 541 break; 542 len = MIN(node->tn_size - uio->uio_offset, resid); 543 if (len == 0) 544 break; 545 error = tmpfs_mappedread(vp->v_object, uobj, len, uio); 546 if ((error != 0) || (resid == uio->uio_resid)) 547 break; 548 } 549 550 out: 551 552 return error; 553 } 554 555 /* --------------------------------------------------------------------- */ 556 557 static int 558 tmpfs_mappedwrite(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 559 { 560 vm_pindex_t idx; 561 vm_page_t vpg, tpg; 562 struct sf_buf *sf; 563 off_t offset, addr; 564 size_t tlen; 565 caddr_t va; 566 int error; 567 568 addr = uio->uio_offset; 569 idx = OFF_TO_IDX(addr); 570 offset = addr & PAGE_MASK; 571 tlen = MIN(PAGE_SIZE - offset, len); 572 573 if ((vobj == NULL) || (vobj->resident_page_count == 0)) { 574 vpg = NULL; 575 goto nocache; 576 } 577 578 VM_OBJECT_LOCK(vobj); 579 lookupvpg: 580 if (((vpg = vm_page_lookup(vobj, idx)) != NULL) && 581 vm_page_is_valid(vpg, offset, tlen)) { 582 if (vm_page_sleep_if_busy(vpg, FALSE, "tmfsmw")) 583 goto lookupvpg; 584 vm_page_busy(vpg); 585 vm_page_lock_queues(); 586 vm_page_undirty(vpg); 587 vm_page_unlock_queues(); 588 VM_OBJECT_UNLOCK(vobj); 589 sched_pin(); 590 sf = sf_buf_alloc(vpg, SFB_CPUPRIVATE); 591 va = (caddr_t)sf_buf_kva(sf); 592 error = uiomove(va + offset, tlen, uio); 593 sf_buf_free(sf); 594 sched_unpin(); 595 } else { 596 VM_OBJECT_UNLOCK(vobj); 597 vpg = NULL; 598 } 599 nocache: 600 VM_OBJECT_LOCK(tobj); 601 vm_object_pip_add(tobj, 1); 602 tpg = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 603 VM_ALLOC_ZERO | VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 604 if (tpg->valid != VM_PAGE_BITS_ALL) { 605 int behind, ahead; 606 if (vm_pager_has_page(tobj, idx, &behind, &ahead)) { 607 error = vm_pager_get_pages(tobj, &tpg, 1, 0); 608 if (error != 0) { 609 printf("tmpfs get pages from pager error [write]\n"); 610 goto out; 611 } 612 } else 613 vm_page_zero_invalid(tpg, TRUE); 614 } 615 VM_OBJECT_UNLOCK(tobj); 616 if (vpg == NULL) { 617 sched_pin(); 618 sf = sf_buf_alloc(tpg, SFB_CPUPRIVATE); 619 va = (caddr_t)sf_buf_kva(sf); 620 error = uiomove(va + offset, tlen, uio); 621 sf_buf_free(sf); 622 sched_unpin(); 623 } else { 624 KASSERT(vpg->valid == VM_PAGE_BITS_ALL, ("parts of vpg invalid")); 625 pmap_copy_page(vpg, tpg); 626 } 627 VM_OBJECT_LOCK(tobj); 628 out: 629 if (vobj != NULL) 630 VM_OBJECT_LOCK(vobj); 631 vm_page_lock_queues(); 632 if (error == 0) { 633 vm_page_set_validclean(tpg, offset, tlen); 634 vm_page_zero_invalid(tpg, TRUE); 635 vm_page_dirty(tpg); 636 } 637 vm_page_unwire(tpg, 0); 638 vm_page_activate(tpg); 639 vm_page_unlock_queues(); 640 vm_page_wakeup(tpg); 641 if (vpg != NULL) 642 vm_page_wakeup(vpg); 643 if (vobj != NULL) 644 VM_OBJECT_UNLOCK(vobj); 645 vm_object_pip_subtract(tobj, 1); 646 VM_OBJECT_UNLOCK(tobj); 647 648 return (error); 649 } 650 651 static int 652 tmpfs_write(struct vop_write_args *v) 653 { 654 struct vnode *vp = v->a_vp; 655 struct uio *uio = v->a_uio; 656 int ioflag = v->a_ioflag; 657 struct thread *td = uio->uio_td; 658 659 boolean_t extended; 660 int error = 0; 661 off_t oldsize; 662 struct tmpfs_node *node; 663 vm_object_t uobj; 664 size_t len; 665 int resid; 666 667 node = VP_TO_TMPFS_NODE(vp); 668 oldsize = node->tn_size; 669 670 if (uio->uio_offset < 0 || vp->v_type != VREG) { 671 error = EINVAL; 672 goto out; 673 } 674 675 if (uio->uio_resid == 0) { 676 error = 0; 677 goto out; 678 } 679 680 if (ioflag & IO_APPEND) 681 uio->uio_offset = node->tn_size; 682 683 if (uio->uio_offset + uio->uio_resid > 684 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 685 return (EFBIG); 686 687 if (vp->v_type == VREG && td != NULL) { 688 PROC_LOCK(td->td_proc); 689 if (uio->uio_offset + uio->uio_resid > 690 lim_cur(td->td_proc, RLIMIT_FSIZE)) { 691 psignal(td->td_proc, SIGXFSZ); 692 PROC_UNLOCK(td->td_proc); 693 return (EFBIG); 694 } 695 PROC_UNLOCK(td->td_proc); 696 } 697 698 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 699 if (extended) { 700 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 701 if (error != 0) 702 goto out; 703 } 704 705 uobj = node->tn_reg.tn_aobj; 706 while ((resid = uio->uio_resid) > 0) { 707 if (node->tn_size <= uio->uio_offset) 708 break; 709 len = MIN(node->tn_size - uio->uio_offset, resid); 710 if (len == 0) 711 break; 712 error = tmpfs_mappedwrite(vp->v_object, uobj, len, uio); 713 if ((error != 0) || (resid == uio->uio_resid)) 714 break; 715 } 716 717 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 718 (extended ? TMPFS_NODE_CHANGED : 0); 719 720 if (node->tn_mode & (S_ISUID | S_ISGID)) { 721 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 722 node->tn_mode &= ~(S_ISUID | S_ISGID); 723 } 724 725 if (error != 0) 726 (void)tmpfs_reg_resize(vp, oldsize); 727 728 out: 729 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 730 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 731 732 return error; 733 } 734 735 /* --------------------------------------------------------------------- */ 736 737 static int 738 tmpfs_fsync(struct vop_fsync_args *v) 739 { 740 struct vnode *vp = v->a_vp; 741 742 MPASS(VOP_ISLOCKED(vp, v->a_td)); 743 744 tmpfs_update(vp); 745 746 return 0; 747 } 748 749 /* --------------------------------------------------------------------- */ 750 751 static int 752 tmpfs_remove(struct vop_remove_args *v) 753 { 754 struct vnode *dvp = v->a_dvp; 755 struct vnode *vp = v->a_vp; 756 757 int error; 758 struct tmpfs_dirent *de; 759 struct tmpfs_mount *tmp; 760 struct tmpfs_node *dnode; 761 struct tmpfs_node *node; 762 763 MPASS(VOP_ISLOCKED(dvp, v->a_cnp->cn_thread)); 764 MPASS(VOP_ISLOCKED(vp, v->a_cnp->cn_thread)); 765 766 if (vp->v_type == VDIR) { 767 error = EISDIR; 768 goto out; 769 } 770 771 dnode = VP_TO_TMPFS_DIR(dvp); 772 node = VP_TO_TMPFS_NODE(vp); 773 tmp = VFS_TO_TMPFS(vp->v_mount); 774 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 775 MPASS(de != NULL); 776 777 /* Files marked as immutable or append-only cannot be deleted. */ 778 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 779 (dnode->tn_flags & APPEND)) { 780 error = EPERM; 781 goto out; 782 } 783 784 /* Remove the entry from the directory; as it is a file, we do not 785 * have to change the number of hard links of the directory. */ 786 tmpfs_dir_detach(dvp, de); 787 788 /* Free the directory entry we just deleted. Note that the node 789 * referred by it will not be removed until the vnode is really 790 * reclaimed. */ 791 tmpfs_free_dirent(tmp, de, TRUE); 792 793 if (node->tn_links > 0) 794 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 795 error = 0; 796 797 out: 798 799 return error; 800 } 801 802 /* --------------------------------------------------------------------- */ 803 804 static int 805 tmpfs_link(struct vop_link_args *v) 806 { 807 struct vnode *dvp = v->a_tdvp; 808 struct vnode *vp = v->a_vp; 809 struct componentname *cnp = v->a_cnp; 810 811 int error; 812 struct tmpfs_dirent *de; 813 struct tmpfs_node *node; 814 815 MPASS(VOP_ISLOCKED(dvp, cnp->cn_thread)); 816 MPASS(cnp->cn_flags & HASBUF); 817 MPASS(dvp != vp); /* XXX When can this be false? */ 818 819 node = VP_TO_TMPFS_NODE(vp); 820 821 /* XXX: Why aren't the following two tests done by the caller? */ 822 823 /* Hard links of directories are forbidden. */ 824 if (vp->v_type == VDIR) { 825 error = EPERM; 826 goto out; 827 } 828 829 /* Cannot create cross-device links. */ 830 if (dvp->v_mount != vp->v_mount) { 831 error = EXDEV; 832 goto out; 833 } 834 835 /* Ensure that we do not overflow the maximum number of links imposed 836 * by the system. */ 837 MPASS(node->tn_links <= LINK_MAX); 838 if (node->tn_links == LINK_MAX) { 839 error = EMLINK; 840 goto out; 841 } 842 843 /* We cannot create links of files marked immutable or append-only. */ 844 if (node->tn_flags & (IMMUTABLE | APPEND)) { 845 error = EPERM; 846 goto out; 847 } 848 849 /* Allocate a new directory entry to represent the node. */ 850 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 851 cnp->cn_nameptr, cnp->cn_namelen, &de); 852 if (error != 0) 853 goto out; 854 855 /* Insert the new directory entry into the appropriate directory. */ 856 tmpfs_dir_attach(dvp, de); 857 858 /* vp link count has changed, so update node times. */ 859 node->tn_status |= TMPFS_NODE_CHANGED; 860 tmpfs_update(vp); 861 862 error = 0; 863 864 out: 865 return error; 866 } 867 868 /* --------------------------------------------------------------------- */ 869 870 static int 871 tmpfs_rename(struct vop_rename_args *v) 872 { 873 struct vnode *fdvp = v->a_fdvp; 874 struct vnode *fvp = v->a_fvp; 875 struct componentname *fcnp = v->a_fcnp; 876 struct vnode *tdvp = v->a_tdvp; 877 struct vnode *tvp = v->a_tvp; 878 struct componentname *tcnp = v->a_tcnp; 879 880 char *newname; 881 int error; 882 struct tmpfs_dirent *de; 883 struct tmpfs_node *fdnode; 884 struct tmpfs_node *fnode; 885 struct tmpfs_node *tnode; 886 struct tmpfs_node *tdnode; 887 888 MPASS(VOP_ISLOCKED(tdvp, tcnp->cn_thread)); 889 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp, tcnp->cn_thread))); 890 MPASS(fcnp->cn_flags & HASBUF); 891 MPASS(tcnp->cn_flags & HASBUF); 892 893 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 894 895 /* Disallow cross-device renames. 896 * XXX Why isn't this done by the caller? */ 897 if (fvp->v_mount != tdvp->v_mount || 898 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 899 error = EXDEV; 900 goto out; 901 } 902 903 tdnode = VP_TO_TMPFS_DIR(tdvp); 904 905 /* If source and target are the same file, there is nothing to do. */ 906 if (fvp == tvp) { 907 error = 0; 908 goto out; 909 } 910 911 /* If we need to move the directory between entries, lock the 912 * source so that we can safely operate on it. */ 913 if (tdvp != fdvp) { 914 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY, tcnp->cn_thread); 915 if (error != 0) 916 goto out; 917 } 918 fdnode = VP_TO_TMPFS_DIR(fdvp); 919 fnode = VP_TO_TMPFS_NODE(fvp); 920 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 921 922 /* Avoid manipulating '.' and '..' entries. */ 923 if (de == NULL) { 924 MPASS(fvp->v_type == VDIR); 925 error = EINVAL; 926 goto out_locked; 927 } 928 MPASS(de->td_node == fnode); 929 930 /* If re-naming a directory to another preexisting directory 931 * ensure that the target directory is empty so that its 932 * removal causes no side effects. 933 * Kern_rename gurantees the destination to be a directory 934 * if the source is one. */ 935 if (tvp != NULL) { 936 MPASS(tnode != NULL); 937 938 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 939 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 940 error = EPERM; 941 goto out_locked; 942 } 943 944 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 945 if (tnode->tn_size > 0) { 946 error = ENOTEMPTY; 947 goto out_locked; 948 } 949 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 950 error = ENOTDIR; 951 goto out_locked; 952 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 953 error = EISDIR; 954 goto out_locked; 955 } else { 956 MPASS(fnode->tn_type != VDIR && 957 tnode->tn_type != VDIR); 958 } 959 } 960 961 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 962 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 963 error = EPERM; 964 goto out_locked; 965 } 966 967 /* Ensure that we have enough memory to hold the new name, if it 968 * has to be changed. */ 969 if (fcnp->cn_namelen != tcnp->cn_namelen || 970 memcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 971 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 972 } else 973 newname = NULL; 974 975 /* If the node is being moved to another directory, we have to do 976 * the move. */ 977 if (fdnode != tdnode) { 978 /* In case we are moving a directory, we have to adjust its 979 * parent to point to the new parent. */ 980 if (de->td_node->tn_type == VDIR) { 981 struct tmpfs_node *n; 982 983 /* Ensure the target directory is not a child of the 984 * directory being moved. Otherwise, we'd end up 985 * with stale nodes. */ 986 n = tdnode; 987 while (n != n->tn_dir.tn_parent) { 988 if (n == fnode) { 989 error = EINVAL; 990 if (newname != NULL) 991 free(newname, M_TMPFSNAME); 992 goto out_locked; 993 } 994 n = n->tn_dir.tn_parent; 995 } 996 997 /* Adjust the parent pointer. */ 998 TMPFS_VALIDATE_DIR(fnode); 999 de->td_node->tn_dir.tn_parent = tdnode; 1000 1001 /* As a result of changing the target of the '..' 1002 * entry, the link count of the source and target 1003 * directories has to be adjusted. */ 1004 fdnode->tn_links--; 1005 tdnode->tn_links++; 1006 } 1007 1008 /* Do the move: just remove the entry from the source directory 1009 * and insert it into the target one. */ 1010 tmpfs_dir_detach(fdvp, de); 1011 tmpfs_dir_attach(tdvp, de); 1012 } 1013 1014 /* If the name has changed, we need to make it effective by changing 1015 * it in the directory entry. */ 1016 if (newname != NULL) { 1017 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1018 1019 free(de->td_name, M_TMPFSNAME); 1020 de->td_namelen = (uint16_t)tcnp->cn_namelen; 1021 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 1022 de->td_name = newname; 1023 1024 fnode->tn_status |= TMPFS_NODE_CHANGED; 1025 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1026 } 1027 1028 /* If we are overwriting an entry, we have to remove the old one 1029 * from the target directory. */ 1030 if (tvp != NULL) { 1031 /* Remove the old entry from the target directory. */ 1032 de = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1033 tmpfs_dir_detach(tdvp, de); 1034 1035 /* Free the directory entry we just deleted. Note that the 1036 * node referred by it will not be removed until the vnode is 1037 * really reclaimed. */ 1038 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 1039 } 1040 1041 error = 0; 1042 1043 out_locked: 1044 if (fdnode != tdnode) 1045 VOP_UNLOCK(fdvp, 0, tcnp->cn_thread); 1046 1047 out: 1048 /* Release target nodes. */ 1049 /* XXX: I don't understand when tdvp can be the same as tvp, but 1050 * other code takes care of this... */ 1051 if (tdvp == tvp) 1052 vrele(tdvp); 1053 else 1054 vput(tdvp); 1055 if (tvp != NULL) 1056 vput(tvp); 1057 1058 /* Release source nodes. */ 1059 vrele(fdvp); 1060 vrele(fvp); 1061 1062 return error; 1063 } 1064 1065 /* --------------------------------------------------------------------- */ 1066 1067 static int 1068 tmpfs_mkdir(struct vop_mkdir_args *v) 1069 { 1070 struct vnode *dvp = v->a_dvp; 1071 struct vnode **vpp = v->a_vpp; 1072 struct componentname *cnp = v->a_cnp; 1073 struct vattr *vap = v->a_vap; 1074 1075 MPASS(vap->va_type == VDIR); 1076 1077 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1078 } 1079 1080 /* --------------------------------------------------------------------- */ 1081 1082 static int 1083 tmpfs_rmdir(struct vop_rmdir_args *v) 1084 { 1085 struct vnode *dvp = v->a_dvp; 1086 struct vnode *vp = v->a_vp; 1087 1088 int error; 1089 struct tmpfs_dirent *de; 1090 struct tmpfs_mount *tmp; 1091 struct tmpfs_node *dnode; 1092 struct tmpfs_node *node; 1093 1094 MPASS(VOP_ISLOCKED(dvp, v->a_cnp->cn_thread)); 1095 MPASS(VOP_ISLOCKED(vp, v->a_cnp->cn_thread)); 1096 1097 tmp = VFS_TO_TMPFS(dvp->v_mount); 1098 dnode = VP_TO_TMPFS_DIR(dvp); 1099 node = VP_TO_TMPFS_DIR(vp); 1100 1101 /* Directories with more than two entries ('.' and '..') cannot be 1102 * removed. */ 1103 if (node->tn_size > 0) { 1104 error = ENOTEMPTY; 1105 goto out; 1106 } 1107 1108 if ((dnode->tn_flags & APPEND) 1109 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1110 error = EPERM; 1111 goto out; 1112 } 1113 1114 /* This invariant holds only if we are not trying to remove "..". 1115 * We checked for that above so this is safe now. */ 1116 MPASS(node->tn_dir.tn_parent == dnode); 1117 1118 /* Get the directory entry associated with node (vp). This was 1119 * filled by tmpfs_lookup while looking up the entry. */ 1120 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1121 MPASS(TMPFS_DIRENT_MATCHES(de, 1122 v->a_cnp->cn_nameptr, 1123 v->a_cnp->cn_namelen)); 1124 1125 /* Check flags to see if we are allowed to remove the directory. */ 1126 if (dnode->tn_flags & APPEND 1127 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1128 error = EPERM; 1129 goto out; 1130 } 1131 1132 /* Detach the directory entry from the directory (dnode). */ 1133 tmpfs_dir_detach(dvp, de); 1134 1135 node->tn_links--; 1136 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1137 TMPFS_NODE_MODIFIED; 1138 node->tn_dir.tn_parent->tn_links--; 1139 node->tn_dir.tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1140 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1141 1142 cache_purge(dvp); 1143 cache_purge(vp); 1144 1145 /* Free the directory entry we just deleted. Note that the node 1146 * referred by it will not be removed until the vnode is really 1147 * reclaimed. */ 1148 tmpfs_free_dirent(tmp, de, TRUE); 1149 1150 /* Release the deleted vnode (will destroy the node, notify 1151 * interested parties and clean it from the cache). */ 1152 1153 dnode->tn_status |= TMPFS_NODE_CHANGED; 1154 tmpfs_update(dvp); 1155 1156 error = 0; 1157 1158 out: 1159 return error; 1160 } 1161 1162 /* --------------------------------------------------------------------- */ 1163 1164 static int 1165 tmpfs_symlink(struct vop_symlink_args *v) 1166 { 1167 struct vnode *dvp = v->a_dvp; 1168 struct vnode **vpp = v->a_vpp; 1169 struct componentname *cnp = v->a_cnp; 1170 struct vattr *vap = v->a_vap; 1171 char *target = v->a_target; 1172 1173 #ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1174 MPASS(vap->va_type == VLNK); 1175 #else 1176 vap->va_type = VLNK; 1177 #endif 1178 1179 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1180 } 1181 1182 /* --------------------------------------------------------------------- */ 1183 1184 static int 1185 tmpfs_readdir(struct vop_readdir_args *v) 1186 { 1187 struct vnode *vp = v->a_vp; 1188 struct uio *uio = v->a_uio; 1189 int *eofflag = v->a_eofflag; 1190 u_long **cookies = v->a_cookies; 1191 int *ncookies = v->a_ncookies; 1192 1193 int error; 1194 off_t startoff; 1195 off_t cnt = 0; 1196 struct tmpfs_node *node; 1197 1198 /* This operation only makes sense on directory nodes. */ 1199 if (vp->v_type != VDIR) 1200 return ENOTDIR; 1201 1202 node = VP_TO_TMPFS_DIR(vp); 1203 1204 startoff = uio->uio_offset; 1205 1206 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1207 error = tmpfs_dir_getdotdent(node, uio); 1208 if (error != 0) 1209 goto outok; 1210 cnt++; 1211 } 1212 1213 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1214 error = tmpfs_dir_getdotdotdent(node, uio); 1215 if (error != 0) 1216 goto outok; 1217 cnt++; 1218 } 1219 1220 error = tmpfs_dir_getdents(node, uio, &cnt); 1221 1222 outok: 1223 MPASS(error >= -1); 1224 1225 if (error == -1) 1226 error = 0; 1227 1228 if (eofflag != NULL) 1229 *eofflag = 1230 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1231 1232 /* Update NFS-related variables. */ 1233 if (error == 0 && cookies != NULL && ncookies != NULL) { 1234 off_t i; 1235 off_t off = startoff; 1236 struct tmpfs_dirent *de = NULL; 1237 1238 *ncookies = cnt; 1239 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1240 1241 for (i = 0; i < cnt; i++) { 1242 MPASS(off != TMPFS_DIRCOOKIE_EOF); 1243 if (off == TMPFS_DIRCOOKIE_DOT) { 1244 off = TMPFS_DIRCOOKIE_DOTDOT; 1245 } else { 1246 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1247 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead); 1248 } else if (de != NULL) { 1249 de = TAILQ_NEXT(de, td_entries); 1250 } else { 1251 de = tmpfs_dir_lookupbycookie(node, 1252 off); 1253 MPASS(de != NULL); 1254 de = TAILQ_NEXT(de, td_entries); 1255 } 1256 if (de == NULL) 1257 off = TMPFS_DIRCOOKIE_EOF; 1258 else 1259 off = tmpfs_dircookie(de); 1260 } 1261 1262 (*cookies)[i] = off; 1263 } 1264 MPASS(uio->uio_offset == off); 1265 } 1266 1267 return error; 1268 } 1269 1270 /* --------------------------------------------------------------------- */ 1271 1272 static int 1273 tmpfs_readlink(struct vop_readlink_args *v) 1274 { 1275 struct vnode *vp = v->a_vp; 1276 struct uio *uio = v->a_uio; 1277 1278 int error; 1279 struct tmpfs_node *node; 1280 1281 MPASS(uio->uio_offset == 0); 1282 MPASS(vp->v_type == VLNK); 1283 1284 node = VP_TO_TMPFS_NODE(vp); 1285 1286 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1287 uio); 1288 node->tn_status |= TMPFS_NODE_ACCESSED; 1289 1290 return error; 1291 } 1292 1293 /* --------------------------------------------------------------------- */ 1294 1295 static int 1296 tmpfs_inactive(struct vop_inactive_args *v) 1297 { 1298 struct vnode *vp = v->a_vp; 1299 struct thread *l = v->a_td; 1300 1301 struct tmpfs_node *node; 1302 1303 MPASS(VOP_ISLOCKED(vp, l)); 1304 1305 node = VP_TO_TMPFS_NODE(vp); 1306 1307 if (node->tn_links == 0) 1308 vrecycle(vp, l); 1309 1310 return 0; 1311 } 1312 1313 /* --------------------------------------------------------------------- */ 1314 1315 int 1316 tmpfs_reclaim(struct vop_reclaim_args *v) 1317 { 1318 struct vnode *vp = v->a_vp; 1319 1320 struct tmpfs_mount *tmp; 1321 struct tmpfs_node *node; 1322 1323 node = VP_TO_TMPFS_NODE(vp); 1324 tmp = VFS_TO_TMPFS(vp->v_mount); 1325 1326 vnode_destroy_vobject(vp); 1327 cache_purge(vp); 1328 tmpfs_free_vp(vp); 1329 1330 /* If the node referenced by this vnode was deleted by the user, 1331 * we must free its associated data structures (now that the vnode 1332 * is being reclaimed). */ 1333 if (node->tn_links == 0) 1334 tmpfs_free_node(tmp, node); 1335 1336 MPASS(vp->v_data == NULL); 1337 return 0; 1338 } 1339 1340 /* --------------------------------------------------------------------- */ 1341 1342 static int 1343 tmpfs_print(struct vop_print_args *v) 1344 { 1345 struct vnode *vp = v->a_vp; 1346 1347 struct tmpfs_node *node; 1348 1349 node = VP_TO_TMPFS_NODE(vp); 1350 1351 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1352 node, node->tn_flags, node->tn_links); 1353 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1354 ", status 0x%x\n", 1355 node->tn_mode, node->tn_uid, node->tn_gid, 1356 (uintmax_t)node->tn_size, node->tn_status); 1357 1358 if (vp->v_type == VFIFO) 1359 fifo_printinfo(vp); 1360 1361 printf("\n"); 1362 1363 return 0; 1364 } 1365 1366 /* --------------------------------------------------------------------- */ 1367 1368 static int 1369 tmpfs_pathconf(struct vop_pathconf_args *v) 1370 { 1371 int name = v->a_name; 1372 register_t *retval = v->a_retval; 1373 1374 int error; 1375 1376 error = 0; 1377 1378 switch (name) { 1379 case _PC_LINK_MAX: 1380 *retval = LINK_MAX; 1381 break; 1382 1383 case _PC_NAME_MAX: 1384 *retval = NAME_MAX; 1385 break; 1386 1387 case _PC_PATH_MAX: 1388 *retval = PATH_MAX; 1389 break; 1390 1391 case _PC_PIPE_BUF: 1392 *retval = PIPE_BUF; 1393 break; 1394 1395 case _PC_CHOWN_RESTRICTED: 1396 *retval = 1; 1397 break; 1398 1399 case _PC_NO_TRUNC: 1400 *retval = 1; 1401 break; 1402 1403 case _PC_SYNC_IO: 1404 *retval = 1; 1405 break; 1406 1407 case _PC_FILESIZEBITS: 1408 *retval = 0; /* XXX Don't know which value should I return. */ 1409 break; 1410 1411 default: 1412 error = EINVAL; 1413 } 1414 1415 return error; 1416 } 1417 1418 static int 1419 tmpfs_vptofh(struct vop_vptofh_args *ap) 1420 { 1421 struct tmpfs_fid *tfhp; 1422 struct tmpfs_node *node; 1423 1424 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1425 node = VP_TO_TMPFS_NODE(ap->a_vp); 1426 1427 tfhp->tf_len = sizeof(struct tmpfs_fid); 1428 tfhp->tf_id = node->tn_id; 1429 tfhp->tf_gen = node->tn_gen; 1430 1431 return (0); 1432 } 1433 1434 /* --------------------------------------------------------------------- */ 1435 1436 /* 1437 * vnode operations vector used for files stored in a tmpfs file system. 1438 */ 1439 struct vop_vector tmpfs_vnodeop_entries = { 1440 .vop_default = &default_vnodeops, 1441 .vop_lookup = vfs_cache_lookup, 1442 .vop_cachedlookup = tmpfs_lookup, 1443 .vop_create = tmpfs_create, 1444 .vop_mknod = tmpfs_mknod, 1445 .vop_open = tmpfs_open, 1446 .vop_close = tmpfs_close, 1447 .vop_access = tmpfs_access, 1448 .vop_getattr = tmpfs_getattr, 1449 .vop_setattr = tmpfs_setattr, 1450 .vop_read = tmpfs_read, 1451 .vop_write = tmpfs_write, 1452 .vop_fsync = tmpfs_fsync, 1453 .vop_remove = tmpfs_remove, 1454 .vop_link = tmpfs_link, 1455 .vop_rename = tmpfs_rename, 1456 .vop_mkdir = tmpfs_mkdir, 1457 .vop_rmdir = tmpfs_rmdir, 1458 .vop_symlink = tmpfs_symlink, 1459 .vop_readdir = tmpfs_readdir, 1460 .vop_readlink = tmpfs_readlink, 1461 .vop_inactive = tmpfs_inactive, 1462 .vop_reclaim = tmpfs_reclaim, 1463 .vop_print = tmpfs_print, 1464 .vop_pathconf = tmpfs_pathconf, 1465 .vop_vptofh = tmpfs_vptofh, 1466 .vop_bmap = VOP_EOPNOTSUPP, 1467 }; 1468
Cache object: 7b83aa208b311e6eb1b96ee799d3541d
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