tmpfs_vnops.c revision 171799
1/* $NetBSD: tmpfs_vnops.c,v 1.35 2007/01/04 15:42:37 elad Exp $ */ 2 3/* 4 * Copyright (c) 2005 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 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40/* 41 * tmpfs vnode interface. 42 */ 43#include <sys/cdefs.h> 44__FBSDID("$FreeBSD: head/sys/fs/tmpfs/tmpfs_vnops.c 171799 2007-08-10 05:24:49Z delphij $"); 45 46#include <sys/param.h> 47#include <sys/fcntl.h> 48#include <sys/lockf.h> 49#include <sys/namei.h> 50#include <sys/priv.h> 51#include <sys/proc.h> 52#include <sys/resourcevar.h> 53#include <sys/stat.h> 54#include <sys/systm.h> 55#include <sys/unistd.h> 56#include <sys/vnode.h> 57 58#include <vm/vm.h> 59#include <vm/vm_object.h> 60#include <vm/vm_page.h> 61#include <vm/vm_pager.h> 62#include <sys/sched.h> 63#include <sys/sf_buf.h> 64#include <machine/_inttypes.h> 65 66#include <fs/fifofs/fifo.h> 67#include <fs/tmpfs/tmpfs_vnops.h> 68#include <fs/tmpfs/tmpfs.h> 69 70/* --------------------------------------------------------------------- */ 71 72static int 73tmpfs_lookup(struct vop_cachedlookup_args *v) 74{ 75 struct vnode *dvp = v->a_dvp; 76 struct vnode **vpp = v->a_vpp; 77 struct componentname *cnp = v->a_cnp; 78 struct thread *td = cnp->cn_thread; 79 80 int error; 81 struct tmpfs_dirent *de; 82 struct tmpfs_node *dnode; 83 84 dnode = VP_TO_TMPFS_DIR(dvp); 85 *vpp = NULLVP; 86 87 /* Check accessibility of requested node as a first step. */ 88 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td); 89 if (error != 0) 90 goto out; 91 92 /* We cannot be requesting the parent directory of the root node. */ 93 MPASS(IMPLIES(dnode->tn_type == VDIR && 94 dnode->tn_dir.tn_parent == dnode, 95 !(cnp->cn_flags & ISDOTDOT))); 96 97 if (cnp->cn_flags & ISDOTDOT) { 98 int ltype = 0; 99 100 ltype = VOP_ISLOCKED(dvp, td); 101 vholdl(dvp); 102 VOP_UNLOCK(dvp, 0, td); 103 /* Allocate a new vnode on the matching entry. */ 104 error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent, 105 cnp->cn_lkflags, vpp, td); 106 107 vn_lock(dvp, ltype | LK_RETRY, td); 108 if (ltype & LK_INTERLOCK) 109 vdropl(dvp); 110 else 111 vdrop(dvp); 112 113 dnode->tn_dir.tn_parent->tn_lookup_dirent = NULL; 114 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 115 VREF(dvp); 116 *vpp = dvp; 117 dnode->tn_lookup_dirent = NULL; 118 error = 0; 119 } else { 120 de = tmpfs_dir_lookup(dnode, cnp); 121 if (de == NULL) { 122 /* The entry was not found in the directory. 123 * This is OK if we are creating or renaming an 124 * entry and are working on the last component of 125 * the path name. */ 126 if ((cnp->cn_flags & ISLASTCN) && 127 (cnp->cn_nameiop == CREATE || \ 128 cnp->cn_nameiop == RENAME)) { 129 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 130 cnp->cn_thread); 131 if (error != 0) 132 goto out; 133 134 /* Keep the component name in the buffer for 135 * future uses. */ 136 cnp->cn_flags |= SAVENAME; 137 138 error = EJUSTRETURN; 139 } else 140 error = ENOENT; 141 } else { 142 struct tmpfs_node *tnode; 143 144 /* The entry was found, so get its associated 145 * tmpfs_node. */ 146 tnode = de->td_node; 147 148 /* If we are not at the last path component and 149 * found a non-directory or non-link entry (which 150 * may itself be pointing to a directory), raise 151 * an error. */ 152 if ((tnode->tn_type != VDIR && 153 tnode->tn_type != VLNK) && 154 !(cnp->cn_flags & ISLASTCN)) { 155 error = ENOTDIR; 156 goto out; 157 } 158 159 /* If we are deleting or renaming the entry, keep 160 * track of its tmpfs_dirent so that it can be 161 * easily deleted later. */ 162 if ((cnp->cn_flags & ISLASTCN) && 163 (cnp->cn_nameiop == DELETE || 164 cnp->cn_nameiop == RENAME)) { 165 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 166 cnp->cn_thread); 167 if (error != 0) 168 goto out; 169 170 /* Allocate a new vnode on the matching entry. */ 171 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 172 cnp->cn_lkflags, vpp, td); 173 if (error != 0) 174 goto out; 175 176 if ((dnode->tn_mode & S_ISTXT) && 177 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, cnp->cn_thread) && 178 VOP_ACCESS(*vpp, VADMIN, cnp->cn_cred, cnp->cn_thread)) { 179 error = EPERM; 180 vput(*vpp); 181 *vpp = NULL; 182 goto out; 183 } 184 tnode->tn_lookup_dirent = de; 185 cnp->cn_flags |= SAVENAME; 186 } else { 187 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 188 cnp->cn_lkflags, vpp, td); 189 } 190 } 191 } 192 193 /* Store the result of this lookup in the cache. Avoid this if the 194 * request was for creation, as it does not improve timings on 195 * emprical tests. */ 196 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) 197 cache_enter(dvp, *vpp, cnp); 198 199out: 200 /* If there were no errors, *vpp cannot be null and it must be 201 * locked. */ 202 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp, td))); 203 204 return error; 205} 206 207/* --------------------------------------------------------------------- */ 208 209static int 210tmpfs_create(struct vop_create_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 MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 218 219 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 220} 221/* --------------------------------------------------------------------- */ 222 223static int 224tmpfs_mknod(struct vop_mknod_args *v) 225{ 226 struct vnode *dvp = v->a_dvp; 227 struct vnode **vpp = v->a_vpp; 228 struct componentname *cnp = v->a_cnp; 229 struct vattr *vap = v->a_vap; 230 231 if (vap->va_type != VBLK && vap->va_type != VCHR && 232 vap->va_type != VFIFO) 233 return EINVAL; 234 235 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 236} 237 238/* --------------------------------------------------------------------- */ 239 240static int 241tmpfs_open(struct vop_open_args *v) 242{ 243 struct vnode *vp = v->a_vp; 244 int mode = v->a_mode; 245 246 int error; 247 struct tmpfs_node *node; 248 249 MPASS(VOP_ISLOCKED(vp, v->a_td)); 250 251 node = VP_TO_TMPFS_NODE(vp); 252 253 /* The file is still active but all its names have been removed 254 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 255 * it is about to die. */ 256 if (node->tn_links < 1) 257 return (ENOENT); 258 259 /* If the file is marked append-only, deny write requests. */ 260 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 261 error = EPERM; 262 else { 263 error = 0; 264 vnode_create_vobject(vp, node->tn_size, v->a_td); 265 } 266 267 MPASS(VOP_ISLOCKED(vp, v->a_td)); 268 return error; 269} 270 271/* --------------------------------------------------------------------- */ 272 273static int 274tmpfs_close(struct vop_close_args *v) 275{ 276 struct vnode *vp = v->a_vp; 277 278 struct tmpfs_node *node; 279 280 MPASS(VOP_ISLOCKED(vp, v->a_td)); 281 282 node = VP_TO_TMPFS_NODE(vp); 283 284 if (node->tn_links > 0) { 285 /* Update node times. No need to do it if the node has 286 * been deleted, because it will vanish after we return. */ 287 tmpfs_update(vp); 288 } 289 290 return 0; 291} 292 293/* --------------------------------------------------------------------- */ 294 295int 296tmpfs_access(struct vop_access_args *v) 297{ 298 struct vnode *vp = v->a_vp; 299 int mode = v->a_mode; 300 struct ucred *cred = v->a_cred; 301 302 int error; 303 struct tmpfs_node *node; 304 305 MPASS(VOP_ISLOCKED(vp, v->a_td)); 306 307 node = VP_TO_TMPFS_NODE(vp); 308 309 switch (vp->v_type) { 310 case VDIR: 311 /* FALLTHROUGH */ 312 case VLNK: 313 /* FALLTHROUGH */ 314 case VREG: 315 if (mode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 316 error = EROFS; 317 goto out; 318 } 319 break; 320 321 case VBLK: 322 /* FALLTHROUGH */ 323 case VCHR: 324 /* FALLTHROUGH */ 325 case VSOCK: 326 /* FALLTHROUGH */ 327 case VFIFO: 328 break; 329 330 default: 331 error = EINVAL; 332 goto out; 333 } 334 335 if (mode & VWRITE && node->tn_flags & IMMUTABLE) { 336 error = EPERM; 337 goto out; 338 } 339 340 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 341 node->tn_gid, mode, cred, NULL); 342 343out: 344 MPASS(VOP_ISLOCKED(vp, v->a_td)); 345 346 return error; 347} 348 349/* --------------------------------------------------------------------- */ 350 351int 352tmpfs_getattr(struct vop_getattr_args *v) 353{ 354 struct vnode *vp = v->a_vp; 355 struct vattr *vap = v->a_vap; 356 357 struct tmpfs_node *node; 358 359 node = VP_TO_TMPFS_NODE(vp); 360 361 VATTR_NULL(vap); 362 363 tmpfs_update(vp); 364 365 vap->va_type = vp->v_type; 366 vap->va_mode = node->tn_mode; 367 vap->va_nlink = node->tn_links; 368 vap->va_uid = node->tn_uid; 369 vap->va_gid = node->tn_gid; 370 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 371 vap->va_fileid = node->tn_id; 372 vap->va_size = node->tn_size; 373 vap->va_blocksize = PAGE_SIZE; 374 vap->va_atime = node->tn_atime; 375 vap->va_mtime = node->tn_mtime; 376 vap->va_ctime = node->tn_ctime; 377 vap->va_birthtime = node->tn_birthtime; 378 vap->va_gen = node->tn_gen; 379 vap->va_flags = node->tn_flags; 380 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 381 node->tn_rdev : VNOVAL; 382 vap->va_bytes = round_page(node->tn_size); 383 vap->va_filerev = VNOVAL; 384 vap->va_vaflags = 0; 385 vap->va_spare = VNOVAL; /* XXX */ 386 387 return 0; 388} 389 390/* --------------------------------------------------------------------- */ 391 392/* XXX Should this operation be atomic? I think it should, but code in 393 * XXX other places (e.g., ufs) doesn't seem to be... */ 394int 395tmpfs_setattr(struct vop_setattr_args *v) 396{ 397 struct vnode *vp = v->a_vp; 398 struct vattr *vap = v->a_vap; 399 struct ucred *cred = v->a_cred; 400 struct thread *l = v->a_td; 401 402 int error; 403 404 MPASS(VOP_ISLOCKED(vp, l)); 405 406 error = 0; 407 408 /* Abort if any unsettable attribute is given. */ 409 if (vap->va_type != VNON || 410 vap->va_nlink != VNOVAL || 411 vap->va_fsid != VNOVAL || 412 vap->va_fileid != VNOVAL || 413 vap->va_blocksize != VNOVAL || 414 vap->va_gen != VNOVAL || 415 vap->va_rdev != VNOVAL || 416 vap->va_bytes != VNOVAL) 417 error = EINVAL; 418 419 if (error == 0 && (vap->va_flags != VNOVAL)) 420 error = tmpfs_chflags(vp, vap->va_flags, cred, l); 421 422 if (error == 0 && (vap->va_size != VNOVAL)) 423 error = tmpfs_chsize(vp, vap->va_size, cred, l); 424 425 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 426 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, 427 l); 428 429 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 430 error = tmpfs_chmod(vp, vap->va_mode, cred, l); 431 432 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 433 vap->va_atime.tv_nsec != VNOVAL) || 434 (vap->va_mtime.tv_sec != VNOVAL && 435 vap->va_mtime.tv_nsec != VNOVAL) || 436 (vap->va_birthtime.tv_sec != VNOVAL && 437 vap->va_birthtime.tv_nsec != VNOVAL))) 438 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 439 &vap->va_birthtime, vap->va_vaflags, cred, l); 440 441 /* Update the node times. We give preference to the error codes 442 * generated by this function rather than the ones that may arise 443 * from tmpfs_update. */ 444 tmpfs_update(vp); 445 446 MPASS(VOP_ISLOCKED(vp, l)); 447 448 return error; 449} 450 451/* --------------------------------------------------------------------- */ 452 453static int 454tmpfs_mappedread(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 455{ 456 vm_pindex_t idx; 457 vm_page_t m; 458 struct sf_buf *sf; 459 off_t offset, addr; 460 size_t tlen; 461 caddr_t va; 462 int error; 463 464 addr = uio->uio_offset; 465 idx = OFF_TO_IDX(addr); 466 offset = addr & PAGE_MASK; 467 tlen = MIN(PAGE_SIZE - offset, len); 468 469 if ((vobj == NULL) || (vobj->resident_page_count == 0)) 470 goto nocache; 471 472 VM_OBJECT_LOCK(vobj); 473lookupvpg: 474 if (((m = vm_page_lookup(vobj, idx)) != NULL) && 475 vm_page_is_valid(m, offset, tlen)) { 476 if (vm_page_sleep_if_busy(m, FALSE, "tmfsmr")) 477 goto lookupvpg; 478 vm_page_busy(m); 479 VM_OBJECT_UNLOCK(vobj); 480 sched_pin(); 481 sf = sf_buf_alloc(m, SFB_CPUPRIVATE); 482 va = (caddr_t)sf_buf_kva(sf); 483 error = uiomove(va + offset, tlen, uio); 484 sf_buf_free(sf); 485 sched_unpin(); 486 VM_OBJECT_LOCK(vobj); 487 vm_page_wakeup(m); 488 VM_OBJECT_UNLOCK(vobj); 489 return (error); 490 } 491 VM_OBJECT_UNLOCK(vobj); 492nocache: 493 VM_OBJECT_LOCK(tobj); 494 vm_object_pip_add(tobj, 1); 495 m = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 496 VM_ALLOC_ZERO | VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 497 if (m->valid != VM_PAGE_BITS_ALL) { 498 int behind, ahead; 499 if (vm_pager_has_page(tobj, idx, &behind, &ahead)) { 500 error = vm_pager_get_pages(tobj, &m, 1, 0); 501 if (error != 0) { 502 printf("tmpfs get pages from pager error [read]\n"); 503 goto out; 504 } 505 } else 506 vm_page_zero_invalid(m, TRUE); 507 } 508 VM_OBJECT_UNLOCK(tobj); 509 sched_pin(); 510 sf = sf_buf_alloc(m, SFB_CPUPRIVATE); 511 va = (caddr_t)sf_buf_kva(sf); 512 error = uiomove(va + offset, tlen, uio); 513 sf_buf_free(sf); 514 sched_unpin(); 515 VM_OBJECT_LOCK(tobj); 516out: 517 vm_page_lock_queues(); 518 vm_page_unwire(m, 0); 519 vm_page_activate(m); 520 vm_page_unlock_queues(); 521 vm_page_wakeup(m); 522 vm_object_pip_subtract(tobj, 1); 523 VM_OBJECT_UNLOCK(tobj); 524 525 return (error); 526} 527 528static int 529tmpfs_read(struct vop_read_args *v) 530{ 531 struct vnode *vp = v->a_vp; 532 struct uio *uio = v->a_uio; 533 534 struct tmpfs_node *node; 535 vm_object_t uobj; 536 size_t len; 537 int resid; 538 539 int error; 540 541 node = VP_TO_TMPFS_NODE(vp); 542 543 if (vp->v_type != VREG) { 544 error = EISDIR; 545 goto out; 546 } 547 548 if (uio->uio_offset < 0) { 549 error = EINVAL; 550 goto out; 551 } 552 553 node->tn_status |= TMPFS_NODE_ACCESSED; 554 555 uobj = node->tn_reg.tn_aobj; 556 while ((resid = uio->uio_resid) > 0) { 557 error = 0; 558 if (node->tn_size <= uio->uio_offset) 559 break; 560 len = MIN(node->tn_size - uio->uio_offset, resid); 561 if (len == 0) 562 break; 563 error = tmpfs_mappedread(vp->v_object, uobj, len, uio); 564 if ((error != 0) || (resid == uio->uio_resid)) 565 break; 566 } 567 568out: 569 570 return error; 571} 572 573/* --------------------------------------------------------------------- */ 574 575static int 576tmpfs_mappedwrite(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 577{ 578 vm_pindex_t idx; 579 vm_page_t vpg, tpg; 580 struct sf_buf *sf; 581 off_t offset, addr; 582 size_t tlen; 583 caddr_t va; 584 int error; 585 586 addr = uio->uio_offset; 587 idx = OFF_TO_IDX(addr); 588 offset = addr & PAGE_MASK; 589 tlen = MIN(PAGE_SIZE - offset, len); 590 591 if ((vobj == NULL) || (vobj->resident_page_count == 0)) { 592 vpg = NULL; 593 goto nocache; 594 } 595 596 VM_OBJECT_LOCK(vobj); 597lookupvpg: 598 if (((vpg = vm_page_lookup(vobj, idx)) != NULL) && 599 vm_page_is_valid(vpg, offset, tlen)) { 600 if (vm_page_sleep_if_busy(vpg, FALSE, "tmfsmw")) 601 goto lookupvpg; 602 vm_page_busy(vpg); 603 vm_page_lock_queues(); 604 vm_page_undirty(vpg); 605 vm_page_unlock_queues(); 606 VM_OBJECT_UNLOCK(vobj); 607 sched_pin(); 608 sf = sf_buf_alloc(vpg, SFB_CPUPRIVATE); 609 va = (caddr_t)sf_buf_kva(sf); 610 error = uiomove(va + offset, tlen, uio); 611 sf_buf_free(sf); 612 sched_unpin(); 613 } else { 614 VM_OBJECT_UNLOCK(vobj); 615 vpg = NULL; 616 } 617nocache: 618 VM_OBJECT_LOCK(tobj); 619 vm_object_pip_add(tobj, 1); 620 tpg = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 621 VM_ALLOC_ZERO | VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 622 if (tpg->valid != VM_PAGE_BITS_ALL) { 623 int behind, ahead; 624 if (vm_pager_has_page(tobj, idx, &behind, &ahead)) { 625 error = vm_pager_get_pages(tobj, &tpg, 1, 0); 626 if (error != 0) { 627 printf("tmpfs get pages from pager error [write]\n"); 628 goto out; 629 } 630 } else 631 vm_page_zero_invalid(tpg, TRUE); 632 } 633 VM_OBJECT_UNLOCK(tobj); 634 if (vpg == NULL) { 635 sched_pin(); 636 sf = sf_buf_alloc(tpg, SFB_CPUPRIVATE); 637 va = (caddr_t)sf_buf_kva(sf); 638 error = uiomove(va + offset, tlen, uio); 639 sf_buf_free(sf); 640 sched_unpin(); 641 } else { 642 KASSERT(vpg->valid == VM_PAGE_BITS_ALL, ("parts of vpg invalid")); 643 pmap_copy_page(vpg, tpg); 644 } 645 VM_OBJECT_LOCK(tobj); 646out: 647 if (vobj != NULL) 648 VM_OBJECT_LOCK(vobj); 649 vm_page_lock_queues(); 650 if (error == 0) { 651 vm_page_set_validclean(tpg, offset, tlen); 652 vm_page_zero_invalid(tpg, TRUE); 653 vm_page_dirty(tpg); 654 } 655 vm_page_unwire(tpg, 0); 656 vm_page_activate(tpg); 657 vm_page_unlock_queues(); 658 vm_page_wakeup(tpg); 659 if (vpg != NULL) 660 vm_page_wakeup(vpg); 661 if (vobj != NULL) 662 VM_OBJECT_UNLOCK(vobj); 663 vm_object_pip_subtract(tobj, 1); 664 VM_OBJECT_UNLOCK(tobj); 665 666 return (error); 667} 668 669static int 670tmpfs_write(struct vop_write_args *v) 671{ 672 struct vnode *vp = v->a_vp; 673 struct uio *uio = v->a_uio; 674 int ioflag = v->a_ioflag; 675 struct thread *td = uio->uio_td; 676 677 boolean_t extended; 678 int error = 0; 679 off_t oldsize; 680 struct tmpfs_node *node; 681 vm_object_t uobj; 682 size_t len; 683 int resid; 684 685 node = VP_TO_TMPFS_NODE(vp); 686 oldsize = node->tn_size; 687 688 if (uio->uio_offset < 0 || vp->v_type != VREG) { 689 error = EINVAL; 690 goto out; 691 } 692 693 if (uio->uio_resid == 0) { 694 error = 0; 695 goto out; 696 } 697 698 if (ioflag & IO_APPEND) 699 uio->uio_offset = node->tn_size; 700 701 if (uio->uio_offset + uio->uio_resid > 702 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 703 return (EFBIG); 704 705 if (vp->v_type == VREG && td != NULL) { 706 PROC_LOCK(td->td_proc); 707 if (uio->uio_offset + uio->uio_resid > 708 lim_cur(td->td_proc, RLIMIT_FSIZE)) { 709 psignal(td->td_proc, SIGXFSZ); 710 PROC_UNLOCK(td->td_proc); 711 return (EFBIG); 712 } 713 PROC_UNLOCK(td->td_proc); 714 } 715 716 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 717 if (extended) { 718 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 719 if (error != 0) 720 goto out; 721 } 722 723 uobj = node->tn_reg.tn_aobj; 724 while ((resid = uio->uio_resid) > 0) { 725 if (node->tn_size <= uio->uio_offset) 726 break; 727 len = MIN(node->tn_size - uio->uio_offset, resid); 728 if (len == 0) 729 break; 730 error = tmpfs_mappedwrite(vp->v_object, uobj, len, uio); 731 if ((error != 0) || (resid == uio->uio_resid)) 732 break; 733 } 734 735 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 736 (extended ? TMPFS_NODE_CHANGED : 0); 737 738 if (node->tn_mode & (S_ISUID | S_ISGID)) { 739 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 740 node->tn_mode &= ~(S_ISUID | S_ISGID); 741 } 742 743 if (error != 0) 744 (void)tmpfs_reg_resize(vp, oldsize); 745 746out: 747 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 748 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 749 750 return error; 751} 752 753/* --------------------------------------------------------------------- */ 754 755static int 756tmpfs_fsync(struct vop_fsync_args *v) 757{ 758 struct vnode *vp = v->a_vp; 759 760 MPASS(VOP_ISLOCKED(vp, v->a_td)); 761 762 tmpfs_update(vp); 763 764 return 0; 765} 766 767/* --------------------------------------------------------------------- */ 768 769static int 770tmpfs_remove(struct vop_remove_args *v) 771{ 772 struct vnode *dvp = v->a_dvp; 773 struct vnode *vp = v->a_vp; 774 775 int error; 776 struct tmpfs_dirent *de; 777 struct tmpfs_mount *tmp; 778 struct tmpfs_node *dnode; 779 struct tmpfs_node *node; 780 781 MPASS(VOP_ISLOCKED(dvp, v->a_cnp->cn_thread)); 782 MPASS(VOP_ISLOCKED(vp, v->a_cnp->cn_thread)); 783 784 if (vp->v_type == VDIR) { 785 error = EISDIR; 786 goto out; 787 } 788 789 dnode = VP_TO_TMPFS_DIR(dvp); 790 node = VP_TO_TMPFS_NODE(vp); 791 tmp = VFS_TO_TMPFS(vp->v_mount); 792 de = node->tn_lookup_dirent; 793 MPASS(de != NULL); 794 795 /* Files marked as immutable or append-only cannot be deleted. */ 796 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 797 (dnode->tn_flags & APPEND)) { 798 error = EPERM; 799 goto out; 800 } 801 802 /* Remove the entry from the directory; as it is a file, we do not 803 * have to change the number of hard links of the directory. */ 804 tmpfs_dir_detach(dvp, de); 805 806 /* Free the directory entry we just deleted. Note that the node 807 * referred by it will not be removed until the vnode is really 808 * reclaimed. */ 809 tmpfs_free_dirent(tmp, de, TRUE); 810 811 if (node->tn_links > 0) 812 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 813 TMPFS_NODE_MODIFIED; 814 error = 0; 815 816out: 817 818 return error; 819} 820 821/* --------------------------------------------------------------------- */ 822 823static int 824tmpfs_link(struct vop_link_args *v) 825{ 826 struct vnode *dvp = v->a_tdvp; 827 struct vnode *vp = v->a_vp; 828 struct componentname *cnp = v->a_cnp; 829 830 int error; 831 struct tmpfs_dirent *de; 832 struct tmpfs_node *node; 833 834 MPASS(VOP_ISLOCKED(dvp, cnp->cn_thread)); 835 MPASS(cnp->cn_flags & HASBUF); 836 MPASS(dvp != vp); /* XXX When can this be false? */ 837 838 node = VP_TO_TMPFS_NODE(vp); 839 840 /* XXX: Why aren't the following two tests done by the caller? */ 841 842 /* Hard links of directories are forbidden. */ 843 if (vp->v_type == VDIR) { 844 error = EPERM; 845 goto out; 846 } 847 848 /* Cannot create cross-device links. */ 849 if (dvp->v_mount != vp->v_mount) { 850 error = EXDEV; 851 goto out; 852 } 853 854 /* Ensure that we do not overflow the maximum number of links imposed 855 * by the system. */ 856 MPASS(node->tn_links <= LINK_MAX); 857 if (node->tn_links == LINK_MAX) { 858 error = EMLINK; 859 goto out; 860 } 861 862 /* We cannot create links of files marked immutable or append-only. */ 863 if (node->tn_flags & (IMMUTABLE | APPEND)) { 864 error = EPERM; 865 goto out; 866 } 867 868 /* Allocate a new directory entry to represent the node. */ 869 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 870 cnp->cn_nameptr, cnp->cn_namelen, &de); 871 if (error != 0) 872 goto out; 873 874 /* Insert the new directory entry into the appropriate directory. */ 875 tmpfs_dir_attach(dvp, de); 876 877 /* vp link count has changed, so update node times. */ 878 node->tn_status |= TMPFS_NODE_CHANGED; 879 tmpfs_update(vp); 880 881 error = 0; 882 883out: 884 return error; 885} 886 887/* --------------------------------------------------------------------- */ 888 889static int 890tmpfs_rename(struct vop_rename_args *v) 891{ 892 struct vnode *fdvp = v->a_fdvp; 893 struct vnode *fvp = v->a_fvp; 894 struct componentname *fcnp = v->a_fcnp; 895 struct vnode *tdvp = v->a_tdvp; 896 struct vnode *tvp = v->a_tvp; 897 struct componentname *tcnp = v->a_tcnp; 898 899 char *newname; 900 int error; 901 struct tmpfs_dirent *de; 902 struct tmpfs_node *fdnode; 903 struct tmpfs_node *fnode; 904 struct tmpfs_node *tnode; 905 struct tmpfs_node *tdnode; 906 907 MPASS(VOP_ISLOCKED(tdvp, tcnp->cn_thread)); 908 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp, tcnp->cn_thread))); 909 MPASS(fcnp->cn_flags & HASBUF); 910 MPASS(tcnp->cn_flags & HASBUF); 911 912 fdnode = VP_TO_TMPFS_DIR(fdvp); 913 fnode = VP_TO_TMPFS_NODE(fvp); 914 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 915 de = fnode->tn_lookup_dirent; 916 917 /* Disallow cross-device renames. 918 * XXX Why isn't this done by the caller? */ 919 if (fvp->v_mount != tdvp->v_mount || 920 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 921 error = EXDEV; 922 goto out; 923 } 924 925 tdnode = VP_TO_TMPFS_DIR(tdvp); 926 927 /* If source and target are the same file, there is nothing to do. */ 928 if (fvp == tvp) { 929 error = 0; 930 goto out; 931 } 932 933 /* Avoid manipulating '.' and '..' entries. */ 934 if (de == NULL) { 935 MPASS(fvp->v_type == VDIR); 936 error = EINVAL; 937 goto out; 938 } 939 MPASS(de->td_node == fnode); 940 941 /* If re-naming a directory to another preexisting directory 942 * ensure that the target directory is empty so that its 943 * removal causes no side effects. 944 * Kern_rename gurantees the destination to be a directory 945 * if the source is one. */ 946 if (tvp != NULL) { 947 MPASS(tnode != NULL); 948 949 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 950 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 951 error = EPERM; 952 goto out; 953 } 954 955 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 956 if (tnode->tn_size > 0) { 957 error = ENOTEMPTY; 958 goto out; 959 } 960 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 961 error = ENOTDIR; 962 goto out; 963 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 964 error = EISDIR; 965 goto out; 966 } else { 967 MPASS(fnode->tn_type != VDIR && 968 tnode->tn_type != VDIR); 969 } 970 } 971 972 /* If we need to move the directory between entries, lock the 973 * source so that we can safely operate on it. */ 974 if (fdnode != tdnode) { 975 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY, tcnp->cn_thread); 976 if (error != 0) 977 goto out; 978 } 979 980 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 981 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 982 error = EPERM; 983 goto out_locked; 984 } 985 986 /* Ensure that we have enough memory to hold the new name, if it 987 * has to be changed. */ 988 if (fcnp->cn_namelen != tcnp->cn_namelen || 989 memcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 990 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 991 } else 992 newname = NULL; 993 994 /* If the node is being moved to another directory, we have to do 995 * the move. */ 996 if (fdnode != tdnode) { 997 /* In case we are moving a directory, we have to adjust its 998 * parent to point to the new parent. */ 999 if (de->td_node->tn_type == VDIR) { 1000 struct tmpfs_node *n; 1001 1002 /* Ensure the target directory is not a child of the 1003 * directory being moved. Otherwise, we'd end up 1004 * with stale nodes. */ 1005 n = tdnode; 1006 while (n != n->tn_dir.tn_parent) { 1007 if (n == fnode) { 1008 error = EINVAL; 1009 if (newname != NULL) 1010 free(newname, M_TMPFSNAME); 1011 goto out_locked; 1012 } 1013 n = n->tn_dir.tn_parent; 1014 } 1015 1016 /* Adjust the parent pointer. */ 1017 TMPFS_VALIDATE_DIR(fnode); 1018 de->td_node->tn_dir.tn_parent = tdnode; 1019 1020 /* As a result of changing the target of the '..' 1021 * entry, the link count of the source and target 1022 * directories has to be adjusted. */ 1023 fdnode->tn_links--; 1024 tdnode->tn_links++; 1025 } 1026 1027 /* Do the move: just remove the entry from the source directory 1028 * and insert it into the target one. */ 1029 tmpfs_dir_detach(fdvp, de); 1030 tmpfs_dir_attach(tdvp, de); 1031 } 1032 1033 /* If the name has changed, we need to make it effective by changing 1034 * it in the directory entry. */ 1035 if (newname != NULL) { 1036 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1037 1038 free(de->td_name, M_TMPFSNAME); 1039 de->td_namelen = (uint16_t)tcnp->cn_namelen; 1040 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 1041 de->td_name = newname; 1042 1043 fnode->tn_status |= TMPFS_NODE_CHANGED; 1044 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1045 } 1046 1047 /* If we are overwriting an entry, we have to remove the old one 1048 * from the target directory. */ 1049 if (tvp != NULL) { 1050 /* Remove the old entry from the target directory. */ 1051 de = tnode->tn_lookup_dirent; 1052 tmpfs_dir_detach(tdvp, de); 1053 1054 /* Free the directory entry we just deleted. Note that the 1055 * node referred by it will not be removed until the vnode is 1056 * really reclaimed. */ 1057 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 1058 } 1059 1060 error = 0; 1061 1062out_locked: 1063 if (fdnode != tdnode) 1064 VOP_UNLOCK(fdvp, 0, tcnp->cn_thread); 1065 1066out: 1067 /* Release target nodes. */ 1068 /* XXX: I don't understand when tdvp can be the same as tvp, but 1069 * other code takes care of this... */ 1070 if (tdvp == tvp) 1071 vrele(tdvp); 1072 else 1073 vput(tdvp); 1074 if (tvp != NULL) 1075 vput(tvp); 1076 1077 /* Release source nodes. */ 1078 vrele(fdvp); 1079 vrele(fvp); 1080 1081 return error; 1082} 1083 1084/* --------------------------------------------------------------------- */ 1085 1086static int 1087tmpfs_mkdir(struct vop_mkdir_args *v) 1088{ 1089 struct vnode *dvp = v->a_dvp; 1090 struct vnode **vpp = v->a_vpp; 1091 struct componentname *cnp = v->a_cnp; 1092 struct vattr *vap = v->a_vap; 1093 1094 MPASS(vap->va_type == VDIR); 1095 1096 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1097} 1098 1099/* --------------------------------------------------------------------- */ 1100 1101static int 1102tmpfs_rmdir(struct vop_rmdir_args *v) 1103{ 1104 struct vnode *dvp = v->a_dvp; 1105 struct vnode *vp = v->a_vp; 1106 1107 int error; 1108 struct tmpfs_dirent *de; 1109 struct tmpfs_mount *tmp; 1110 struct tmpfs_node *dnode; 1111 struct tmpfs_node *node; 1112 1113 MPASS(VOP_ISLOCKED(dvp, v->a_cnp->cn_thread)); 1114 MPASS(VOP_ISLOCKED(vp, v->a_cnp->cn_thread)); 1115 1116 tmp = VFS_TO_TMPFS(dvp->v_mount); 1117 dnode = VP_TO_TMPFS_DIR(dvp); 1118 node = VP_TO_TMPFS_DIR(vp); 1119 1120 /* Directories with more than two entries ('.' and '..') cannot be 1121 * removed. */ 1122 if (node->tn_size > 0) { 1123 error = ENOTEMPTY; 1124 goto out; 1125 } 1126 1127 if ((dnode->tn_flags & APPEND) 1128 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1129 error = EPERM; 1130 goto out; 1131 } 1132 1133 /* This invariant holds only if we are not trying to remove "..". 1134 * We checked for that above so this is safe now. */ 1135 MPASS(node->tn_dir.tn_parent == dnode); 1136 1137 /* Get the directory entry associated with node (vp). This was 1138 * filled by tmpfs_lookup while looking up the entry. */ 1139 de = node->tn_lookup_dirent; 1140 MPASS(TMPFS_DIRENT_MATCHES(de, 1141 v->a_cnp->cn_nameptr, 1142 v->a_cnp->cn_namelen)); 1143 1144 /* Check flags to see if we are allowed to remove the directory. */ 1145 if (dnode->tn_flags & APPEND 1146 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1147 error = EPERM; 1148 goto out; 1149 } 1150 1151 /* Detach the directory entry from the directory (dnode). */ 1152 tmpfs_dir_detach(dvp, de); 1153 1154 node->tn_links--; 1155 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1156 TMPFS_NODE_MODIFIED; 1157 node->tn_dir.tn_parent->tn_links--; 1158 node->tn_dir.tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1159 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1160 1161 cache_purge(dvp); 1162 cache_purge(vp); 1163 1164 /* Free the directory entry we just deleted. Note that the node 1165 * referred by it will not be removed until the vnode is really 1166 * reclaimed. */ 1167 tmpfs_free_dirent(tmp, de, TRUE); 1168 1169 /* Release the deleted vnode (will destroy the node, notify 1170 * interested parties and clean it from the cache). */ 1171 1172 dnode->tn_status |= TMPFS_NODE_CHANGED; 1173 tmpfs_update(dvp); 1174 1175 error = 0; 1176 1177out: 1178 return error; 1179} 1180 1181/* --------------------------------------------------------------------- */ 1182 1183static int 1184tmpfs_symlink(struct vop_symlink_args *v) 1185{ 1186 struct vnode *dvp = v->a_dvp; 1187 struct vnode **vpp = v->a_vpp; 1188 struct componentname *cnp = v->a_cnp; 1189 struct vattr *vap = v->a_vap; 1190 char *target = v->a_target; 1191 1192#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1193 MPASS(vap->va_type == VLNK); 1194#else 1195 vap->va_type = VLNK; 1196#endif 1197 1198 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1199} 1200 1201/* --------------------------------------------------------------------- */ 1202 1203static int 1204tmpfs_readdir(struct vop_readdir_args *v) 1205{ 1206 struct vnode *vp = v->a_vp; 1207 struct uio *uio = v->a_uio; 1208 int *eofflag = v->a_eofflag; 1209 u_long **cookies = v->a_cookies; 1210 int *ncookies = v->a_ncookies; 1211 1212 int error; 1213 off_t startoff; 1214 off_t cnt; 1215 struct tmpfs_node *node; 1216 1217 /* This operation only makes sense on directory nodes. */ 1218 if (vp->v_type != VDIR) { 1219 error = ENOTDIR; 1220 goto out; 1221 } 1222 1223 node = VP_TO_TMPFS_DIR(vp); 1224 1225 startoff = uio->uio_offset; 1226 1227 cnt = 0; 1228 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1229 error = tmpfs_dir_getdotdent(node, uio); 1230 if (error == -1) { 1231 error = 0; 1232 goto outok; 1233 } else if (error != 0) 1234 goto outok; 1235 cnt++; 1236 } 1237 1238 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1239 error = tmpfs_dir_getdotdotdent(node, uio); 1240 if (error == -1) { 1241 error = 0; 1242 goto outok; 1243 } else if (error != 0) 1244 goto outok; 1245 cnt++; 1246 } 1247 1248 error = tmpfs_dir_getdents(node, uio, &cnt); 1249 if (error == -1) 1250 error = 0; 1251 MPASS(error >= 0); 1252 1253outok: 1254 /* This label assumes that startoff has been 1255 * initialized. If the compiler didn't spit out warnings, we'd 1256 * simply make this one be 'out' and drop 'outok'. */ 1257 1258 if (eofflag != NULL) 1259 *eofflag = 1260 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1261 1262 /* Update NFS-related variables. */ 1263 if (error == 0 && cookies != NULL && ncookies != NULL) { 1264 off_t i; 1265 off_t off = startoff; 1266 struct tmpfs_dirent *de = NULL; 1267 1268 *ncookies = cnt; 1269 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1270 1271 for (i = 0; i < cnt; i++) { 1272 MPASS(off != TMPFS_DIRCOOKIE_EOF); 1273 if (off == TMPFS_DIRCOOKIE_DOT) { 1274 off = TMPFS_DIRCOOKIE_DOTDOT; 1275 } else { 1276 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1277 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead); 1278 } else if (de != NULL) { 1279 de = TAILQ_NEXT(de, td_entries); 1280 } else { 1281 de = tmpfs_dir_lookupbycookie(node, 1282 off); 1283 MPASS(de != NULL); 1284 de = TAILQ_NEXT(de, td_entries); 1285 } 1286 if (de == NULL) { 1287 off = TMPFS_DIRCOOKIE_EOF; 1288 } else { 1289 off = TMPFS_DIRCOOKIE(de); 1290 } 1291 } 1292 1293 (*cookies)[i] = off; 1294 } 1295 MPASS(uio->uio_offset == off); 1296 } 1297 1298out: 1299 return error; 1300} 1301 1302/* --------------------------------------------------------------------- */ 1303 1304static int 1305tmpfs_readlink(struct vop_readlink_args *v) 1306{ 1307 struct vnode *vp = v->a_vp; 1308 struct uio *uio = v->a_uio; 1309 1310 int error; 1311 struct tmpfs_node *node; 1312 1313 MPASS(uio->uio_offset == 0); 1314 MPASS(vp->v_type == VLNK); 1315 1316 node = VP_TO_TMPFS_NODE(vp); 1317 1318 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1319 uio); 1320 node->tn_status |= TMPFS_NODE_ACCESSED; 1321 1322 return error; 1323} 1324 1325/* --------------------------------------------------------------------- */ 1326 1327static int 1328tmpfs_inactive(struct vop_inactive_args *v) 1329{ 1330 struct vnode *vp = v->a_vp; 1331 struct thread *l = v->a_td; 1332 1333 struct tmpfs_node *node; 1334 1335 MPASS(VOP_ISLOCKED(vp, l)); 1336 1337 node = VP_TO_TMPFS_NODE(vp); 1338 1339 if (node->tn_links == 0) 1340 vrecycle(vp, l); 1341 1342 return 0; 1343} 1344 1345/* --------------------------------------------------------------------- */ 1346 1347int 1348tmpfs_reclaim(struct vop_reclaim_args *v) 1349{ 1350 struct vnode *vp = v->a_vp; 1351 1352 struct tmpfs_mount *tmp; 1353 struct tmpfs_node *node; 1354 1355 node = VP_TO_TMPFS_NODE(vp); 1356 tmp = VFS_TO_TMPFS(vp->v_mount); 1357 1358 vnode_destroy_vobject(vp); 1359 cache_purge(vp); 1360 tmpfs_free_vp(vp); 1361 1362 /* If the node referenced by this vnode was deleted by the user, 1363 * we must free its associated data structures (now that the vnode 1364 * is being reclaimed). */ 1365 if (node->tn_links == 0) 1366 tmpfs_free_node(tmp, node); 1367 1368 MPASS(vp->v_data == NULL); 1369 return 0; 1370} 1371 1372/* --------------------------------------------------------------------- */ 1373 1374static int 1375tmpfs_print(struct vop_print_args *v) 1376{ 1377 struct vnode *vp = v->a_vp; 1378 1379 struct tmpfs_node *node; 1380 1381 node = VP_TO_TMPFS_NODE(vp); 1382 1383 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1384 node, node->tn_flags, node->tn_links); 1385 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1386 ", status 0x%x\n", 1387 node->tn_mode, node->tn_uid, node->tn_gid, 1388 (uintmax_t)node->tn_size, node->tn_status); 1389 1390 if (vp->v_type == VFIFO) 1391 fifo_printinfo(vp); 1392 1393 printf("\n"); 1394 1395 return 0; 1396} 1397 1398/* --------------------------------------------------------------------- */ 1399 1400static int 1401tmpfs_pathconf(struct vop_pathconf_args *v) 1402{ 1403 int name = v->a_name; 1404 register_t *retval = v->a_retval; 1405 1406 int error; 1407 1408 error = 0; 1409 1410 switch (name) { 1411 case _PC_LINK_MAX: 1412 *retval = LINK_MAX; 1413 break; 1414 1415 case _PC_NAME_MAX: 1416 *retval = NAME_MAX; 1417 break; 1418 1419 case _PC_PATH_MAX: 1420 *retval = PATH_MAX; 1421 break; 1422 1423 case _PC_PIPE_BUF: 1424 *retval = PIPE_BUF; 1425 break; 1426 1427 case _PC_CHOWN_RESTRICTED: 1428 *retval = 1; 1429 break; 1430 1431 case _PC_NO_TRUNC: 1432 *retval = 1; 1433 break; 1434 1435 case _PC_SYNC_IO: 1436 *retval = 1; 1437 break; 1438 1439 case _PC_FILESIZEBITS: 1440 *retval = 0; /* XXX Don't know which value should I return. */ 1441 break; 1442 1443 default: 1444 error = EINVAL; 1445 } 1446 1447 return error; 1448} 1449 1450/* --------------------------------------------------------------------- */ 1451 1452static int 1453tmpfs_advlock(struct vop_advlock_args *v) 1454{ 1455 struct vnode *vp = v->a_vp; 1456 1457 struct tmpfs_node *node; 1458 1459 node = VP_TO_TMPFS_NODE(vp); 1460 1461 return lf_advlock(v, &node->tn_lockf, node->tn_size); 1462} 1463 1464/* --------------------------------------------------------------------- */ 1465 1466static int 1467tmpfs_vptofh(struct vop_vptofh_args *ap) 1468{ 1469 struct tmpfs_fid *tfhp; 1470 struct tmpfs_node *node; 1471 1472 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1473 node = VP_TO_TMPFS_NODE(ap->a_vp); 1474 1475 tfhp->tf_len = sizeof(struct tmpfs_fid); 1476 tfhp->tf_id = node->tn_id; 1477 tfhp->tf_gen = node->tn_gen; 1478 1479 return (0); 1480} 1481 1482/* --------------------------------------------------------------------- */ 1483 1484/* 1485 * vnode operations vector used for files stored in a tmpfs file system. 1486 */ 1487struct vop_vector tmpfs_vnodeop_entries = { 1488 .vop_default = &default_vnodeops, 1489 .vop_lookup = vfs_cache_lookup, 1490 .vop_cachedlookup = tmpfs_lookup, 1491 .vop_create = tmpfs_create, 1492 .vop_mknod = tmpfs_mknod, 1493 .vop_open = tmpfs_open, 1494 .vop_close = tmpfs_close, 1495 .vop_access = tmpfs_access, 1496 .vop_getattr = tmpfs_getattr, 1497 .vop_setattr = tmpfs_setattr, 1498 .vop_read = tmpfs_read, 1499 .vop_write = tmpfs_write, 1500 .vop_fsync = tmpfs_fsync, 1501 .vop_remove = tmpfs_remove, 1502 .vop_link = tmpfs_link, 1503 .vop_rename = tmpfs_rename, 1504 .vop_mkdir = tmpfs_mkdir, 1505 .vop_rmdir = tmpfs_rmdir, 1506 .vop_symlink = tmpfs_symlink, 1507 .vop_readdir = tmpfs_readdir, 1508 .vop_readlink = tmpfs_readlink, 1509 .vop_inactive = tmpfs_inactive, 1510 .vop_reclaim = tmpfs_reclaim, 1511 .vop_print = tmpfs_print, 1512 .vop_pathconf = tmpfs_pathconf, 1513 .vop_advlock = tmpfs_advlock, 1514 .vop_vptofh = tmpfs_vptofh, 1515 .vop_bmap = VOP_EOPNOTSUPP, 1516}; 1517 1518