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/sched.h> 47 #include <sys/sf_buf.h> 48 #include <sys/stat.h> 49 #include <sys/systm.h> 50 #include <sys/unistd.h> 51 #include <sys/vnode.h> 52 53 #include <vm/vm.h> 54 #include <vm/vm_object.h> 55 #include <vm/vm_page.h> 56 #include <vm/vm_pager.h> 57 58 #include <machine/_inttypes.h> 59 60 #include <fs/fifofs/fifo.h> 61 #include <fs/tmpfs/tmpfs_vnops.h> 62 #include <fs/tmpfs/tmpfs.h> 63 64 /* --------------------------------------------------------------------- */ 65 66 static int 67 tmpfs_lookup(struct vop_cachedlookup_args *v) 68 { 69 struct vnode *dvp = v->a_dvp; 70 struct vnode **vpp = v->a_vpp; 71 struct componentname *cnp = v->a_cnp; 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, cnp->cn_thread); 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 TMPFS_ASSERT_LOCKED(dnode); 91 if (dnode->tn_dir.tn_parent == NULL) { 92 error = ENOENT; 93 goto out; 94 } 95 if (cnp->cn_flags & ISDOTDOT) { 96 int ltype = 0; 97 98 ltype = VOP_ISLOCKED(dvp); 99 vhold(dvp); 100 VOP_UNLOCK(dvp, 0); 101 /* Allocate a new vnode on the matching entry. */ 102 error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent, 103 cnp->cn_lkflags, vpp); 104 105 vn_lock(dvp, ltype | LK_RETRY); 106 vdrop(dvp); 107 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 108 VREF(dvp); 109 *vpp = dvp; 110 error = 0; 111 } else { 112 de = tmpfs_dir_lookup(dnode, NULL, cnp); 113 if (de == NULL) { 114 /* The entry was not found in the directory. 115 * This is OK if we are creating or renaming an 116 * entry and are working on the last component of 117 * the path name. */ 118 if ((cnp->cn_flags & ISLASTCN) && 119 (cnp->cn_nameiop == CREATE || \ 120 cnp->cn_nameiop == RENAME)) { 121 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 122 cnp->cn_thread); 123 if (error != 0) 124 goto out; 125 126 /* Keep the component name in the buffer for 127 * future uses. */ 128 cnp->cn_flags |= SAVENAME; 129 130 error = EJUSTRETURN; 131 } else 132 error = ENOENT; 133 } else { 134 struct tmpfs_node *tnode; 135 136 /* The entry was found, so get its associated 137 * tmpfs_node. */ 138 tnode = de->td_node; 139 140 /* If we are not at the last path component and 141 * found a non-directory or non-link entry (which 142 * may itself be pointing to a directory), raise 143 * an error. */ 144 if ((tnode->tn_type != VDIR && 145 tnode->tn_type != VLNK) && 146 !(cnp->cn_flags & ISLASTCN)) { 147 error = ENOTDIR; 148 goto out; 149 } 150 151 /* If we are deleting or renaming the entry, keep 152 * track of its tmpfs_dirent so that it can be 153 * easily deleted later. */ 154 if ((cnp->cn_flags & ISLASTCN) && 155 (cnp->cn_nameiop == DELETE || 156 cnp->cn_nameiop == RENAME)) { 157 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 158 cnp->cn_thread); 159 if (error != 0) 160 goto out; 161 162 /* Allocate a new vnode on the matching entry. */ 163 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 164 cnp->cn_lkflags, vpp); 165 if (error != 0) 166 goto out; 167 168 if ((dnode->tn_mode & S_ISTXT) && 169 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, cnp->cn_thread) && 170 VOP_ACCESS(*vpp, VADMIN, cnp->cn_cred, cnp->cn_thread)) { 171 error = EPERM; 172 vput(*vpp); 173 *vpp = NULL; 174 goto out; 175 } 176 cnp->cn_flags |= SAVENAME; 177 } else { 178 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 179 cnp->cn_lkflags, vpp); 180 } 181 } 182 } 183 184 /* Store the result of this lookup in the cache. Avoid this if the 185 * request was for creation, as it does not improve timings on 186 * emprical tests. */ 187 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) 188 cache_enter(dvp, *vpp, cnp); 189 190 out: 191 /* If there were no errors, *vpp cannot be null and it must be 192 * locked. */ 193 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp))); 194 195 return error; 196 } 197 198 /* --------------------------------------------------------------------- */ 199 200 static int 201 tmpfs_create(struct vop_create_args *v) 202 { 203 struct vnode *dvp = v->a_dvp; 204 struct vnode **vpp = v->a_vpp; 205 struct componentname *cnp = v->a_cnp; 206 struct vattr *vap = v->a_vap; 207 208 MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 209 210 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 211 } 212 /* --------------------------------------------------------------------- */ 213 214 static int 215 tmpfs_mknod(struct vop_mknod_args *v) 216 { 217 struct vnode *dvp = v->a_dvp; 218 struct vnode **vpp = v->a_vpp; 219 struct componentname *cnp = v->a_cnp; 220 struct vattr *vap = v->a_vap; 221 222 if (vap->va_type != VBLK && vap->va_type != VCHR && 223 vap->va_type != VFIFO) 224 return EINVAL; 225 226 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 227 } 228 229 /* --------------------------------------------------------------------- */ 230 231 static int 232 tmpfs_open(struct vop_open_args *v) 233 { 234 struct vnode *vp = v->a_vp; 235 int mode = v->a_mode; 236 237 int error; 238 struct tmpfs_node *node; 239 240 MPASS(VOP_ISLOCKED(vp)); 241 242 node = VP_TO_TMPFS_NODE(vp); 243 244 /* The file is still active but all its names have been removed 245 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 246 * it is about to die. */ 247 if (node->tn_links < 1) 248 return (ENOENT); 249 250 /* If the file is marked append-only, deny write requests. */ 251 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 252 error = EPERM; 253 else { 254 error = 0; 255 vnode_create_vobject(vp, node->tn_size, v->a_td); 256 } 257 258 MPASS(VOP_ISLOCKED(vp)); 259 return error; 260 } 261 262 /* --------------------------------------------------------------------- */ 263 264 static int 265 tmpfs_close(struct vop_close_args *v) 266 { 267 struct vnode *vp = v->a_vp; 268 269 struct tmpfs_node *node; 270 271 MPASS(VOP_ISLOCKED(vp)); 272 273 node = VP_TO_TMPFS_NODE(vp); 274 275 if (node->tn_links > 0) { 276 /* Update node times. No need to do it if the node has 277 * been deleted, because it will vanish after we return. */ 278 tmpfs_update(vp); 279 } 280 281 return 0; 282 } 283 284 /* --------------------------------------------------------------------- */ 285 286 int 287 tmpfs_access(struct vop_access_args *v) 288 { 289 struct vnode *vp = v->a_vp; 290 accmode_t accmode = v->a_accmode; 291 struct ucred *cred = v->a_cred; 292 293 int error; 294 struct tmpfs_node *node; 295 296 MPASS(VOP_ISLOCKED(vp)); 297 298 node = VP_TO_TMPFS_NODE(vp); 299 300 switch (vp->v_type) { 301 case VDIR: 302 /* FALLTHROUGH */ 303 case VLNK: 304 /* FALLTHROUGH */ 305 case VREG: 306 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 307 error = EROFS; 308 goto out; 309 } 310 break; 311 312 case VBLK: 313 /* FALLTHROUGH */ 314 case VCHR: 315 /* FALLTHROUGH */ 316 case VSOCK: 317 /* FALLTHROUGH */ 318 case VFIFO: 319 break; 320 321 default: 322 error = EINVAL; 323 goto out; 324 } 325 326 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 327 error = EPERM; 328 goto out; 329 } 330 331 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 332 node->tn_gid, accmode, cred, NULL); 333 334 out: 335 MPASS(VOP_ISLOCKED(vp)); 336 337 return error; 338 } 339 340 /* --------------------------------------------------------------------- */ 341 342 int 343 tmpfs_getattr(struct vop_getattr_args *v) 344 { 345 struct vnode *vp = v->a_vp; 346 struct vattr *vap = v->a_vap; 347 348 struct tmpfs_node *node; 349 350 node = VP_TO_TMPFS_NODE(vp); 351 352 tmpfs_update(vp); 353 354 vap->va_type = vp->v_type; 355 vap->va_mode = node->tn_mode; 356 vap->va_nlink = node->tn_links; 357 vap->va_uid = node->tn_uid; 358 vap->va_gid = node->tn_gid; 359 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 360 vap->va_fileid = node->tn_id; 361 vap->va_size = node->tn_size; 362 vap->va_blocksize = PAGE_SIZE; 363 vap->va_atime = node->tn_atime; 364 vap->va_mtime = node->tn_mtime; 365 vap->va_ctime = node->tn_ctime; 366 vap->va_birthtime = node->tn_birthtime; 367 vap->va_gen = node->tn_gen; 368 vap->va_flags = node->tn_flags; 369 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 370 node->tn_rdev : NODEV; 371 vap->va_bytes = round_page(node->tn_size); 372 vap->va_filerev = 0; 373 374 return 0; 375 } 376 377 /* --------------------------------------------------------------------- */ 378 379 /* XXX Should this operation be atomic? I think it should, but code in 380 * XXX other places (e.g., ufs) doesn't seem to be... */ 381 int 382 tmpfs_setattr(struct vop_setattr_args *v) 383 { 384 struct vnode *vp = v->a_vp; 385 struct vattr *vap = v->a_vap; 386 struct ucred *cred = v->a_cred; 387 struct thread *td = curthread; 388 389 int error; 390 391 MPASS(VOP_ISLOCKED(vp)); 392 393 error = 0; 394 395 /* Abort if any unsettable attribute is given. */ 396 if (vap->va_type != VNON || 397 vap->va_nlink != VNOVAL || 398 vap->va_fsid != VNOVAL || 399 vap->va_fileid != VNOVAL || 400 vap->va_blocksize != VNOVAL || 401 vap->va_gen != VNOVAL || 402 vap->va_rdev != VNOVAL || 403 vap->va_bytes != VNOVAL) 404 error = EINVAL; 405 406 if (error == 0 && (vap->va_flags != VNOVAL)) 407 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 408 409 if (error == 0 && (vap->va_size != VNOVAL)) 410 error = tmpfs_chsize(vp, vap->va_size, cred, td); 411 412 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 413 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 414 415 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 416 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 417 418 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 419 vap->va_atime.tv_nsec != VNOVAL) || 420 (vap->va_mtime.tv_sec != VNOVAL && 421 vap->va_mtime.tv_nsec != VNOVAL) || 422 (vap->va_birthtime.tv_sec != VNOVAL && 423 vap->va_birthtime.tv_nsec != VNOVAL))) 424 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 425 &vap->va_birthtime, vap->va_vaflags, cred, td); 426 427 /* Update the node times. We give preference to the error codes 428 * generated by this function rather than the ones that may arise 429 * from tmpfs_update. */ 430 tmpfs_update(vp); 431 432 MPASS(VOP_ISLOCKED(vp)); 433 434 return error; 435 } 436 437 /* --------------------------------------------------------------------- */ 438 static int 439 tmpfs_nocacheread(vm_object_t tobj, vm_pindex_t idx, 440 vm_offset_t offset, size_t tlen, struct uio *uio) 441 { 442 vm_page_t m; 443 int error; 444 445 VM_OBJECT_LOCK(tobj); 446 vm_object_pip_add(tobj, 1); 447 m = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 448 VM_ALLOC_ZERO | VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 449 if (m->valid != VM_PAGE_BITS_ALL) { 450 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 451 error = vm_pager_get_pages(tobj, &m, 1, 0); 452 if (error != 0) { 453 printf("tmpfs get pages from pager error [read]\n"); 454 goto out; 455 } 456 } else 457 vm_page_zero_invalid(m, TRUE); 458 } 459 VM_OBJECT_UNLOCK(tobj); 460 error = uiomove_fromphys(&m, offset, tlen, uio); 461 VM_OBJECT_LOCK(tobj); 462 out: 463 vm_page_lock_queues(); 464 vm_page_unwire(m, TRUE); 465 vm_page_unlock_queues(); 466 vm_page_wakeup(m); 467 vm_object_pip_subtract(tobj, 1); 468 VM_OBJECT_UNLOCK(tobj); 469 470 return (error); 471 } 472 473 static __inline int 474 tmpfs_nocacheread_buf(vm_object_t tobj, vm_pindex_t idx, 475 vm_offset_t offset, size_t tlen, void *buf) 476 { 477 struct uio uio; 478 struct iovec iov; 479 480 uio.uio_iovcnt = 1; 481 uio.uio_iov = &iov; 482 iov.iov_base = buf; 483 iov.iov_len = tlen; 484 485 uio.uio_offset = 0; 486 uio.uio_resid = tlen; 487 uio.uio_rw = UIO_READ; 488 uio.uio_segflg = UIO_SYSSPACE; 489 uio.uio_td = curthread; 490 491 return (tmpfs_nocacheread(tobj, idx, offset, tlen, &uio)); 492 } 493 494 static int 495 tmpfs_mappedread(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 496 { 497 struct sf_buf *sf; 498 vm_pindex_t idx; 499 vm_page_t m; 500 vm_offset_t offset; 501 off_t addr; 502 size_t tlen; 503 char *ma; 504 int error; 505 506 addr = uio->uio_offset; 507 idx = OFF_TO_IDX(addr); 508 offset = addr & PAGE_MASK; 509 tlen = MIN(PAGE_SIZE - offset, len); 510 511 if ((vobj == NULL) || 512 (vobj->resident_page_count == 0 && vobj->cache == NULL)) 513 goto nocache; 514 515 VM_OBJECT_LOCK(vobj); 516 lookupvpg: 517 if (((m = vm_page_lookup(vobj, idx)) != NULL) && 518 vm_page_is_valid(m, offset, tlen)) { 519 if ((m->oflags & VPO_BUSY) != 0) { 520 /* 521 * Reference the page before unlocking and sleeping so 522 * that the page daemon is less likely to reclaim it. 523 */ 524 vm_page_lock_queues(); 525 vm_page_flag_set(m, PG_REFERENCED); 526 vm_page_sleep(m, "tmfsmr"); 527 goto lookupvpg; 528 } 529 vm_page_busy(m); 530 VM_OBJECT_UNLOCK(vobj); 531 error = uiomove_fromphys(&m, offset, tlen, uio); 532 VM_OBJECT_LOCK(vobj); 533 vm_page_wakeup(m); 534 VM_OBJECT_UNLOCK(vobj); 535 return (error); 536 } else if (m != NULL && uio->uio_segflg == UIO_NOCOPY) { 537 if ((m->oflags & VPO_BUSY) != 0) { 538 /* 539 * Reference the page before unlocking and sleeping so 540 * that the page daemon is less likely to reclaim it. 541 */ 542 vm_page_lock_queues(); 543 vm_page_flag_set(m, PG_REFERENCED); 544 vm_page_sleep(m, "tmfsmr"); 545 goto lookupvpg; 546 } 547 vm_page_busy(m); 548 VM_OBJECT_UNLOCK(vobj); 549 sched_pin(); 550 sf = sf_buf_alloc(m, SFB_CPUPRIVATE); 551 ma = (char *)sf_buf_kva(sf); 552 error = tmpfs_nocacheread_buf(tobj, idx, offset, tlen, 553 ma + offset); 554 if (error == 0) { 555 uio->uio_offset += tlen; 556 uio->uio_resid -= tlen; 557 } 558 sf_buf_free(sf); 559 sched_unpin(); 560 VM_OBJECT_LOCK(vobj); 561 vm_page_wakeup(m); 562 VM_OBJECT_UNLOCK(vobj); 563 return (error); 564 } 565 VM_OBJECT_UNLOCK(vobj); 566 nocache: 567 error = tmpfs_nocacheread(tobj, idx, offset, tlen, uio); 568 569 return (error); 570 } 571 572 static int 573 tmpfs_read(struct vop_read_args *v) 574 { 575 struct vnode *vp = v->a_vp; 576 struct uio *uio = v->a_uio; 577 578 struct tmpfs_node *node; 579 vm_object_t uobj; 580 size_t len; 581 int resid; 582 583 int error = 0; 584 585 node = VP_TO_TMPFS_NODE(vp); 586 587 if (vp->v_type != VREG) { 588 error = EISDIR; 589 goto out; 590 } 591 592 if (uio->uio_offset < 0) { 593 error = EINVAL; 594 goto out; 595 } 596 597 node->tn_status |= TMPFS_NODE_ACCESSED; 598 599 uobj = node->tn_reg.tn_aobj; 600 while ((resid = uio->uio_resid) > 0) { 601 error = 0; 602 if (node->tn_size <= uio->uio_offset) 603 break; 604 len = MIN(node->tn_size - uio->uio_offset, resid); 605 if (len == 0) 606 break; 607 error = tmpfs_mappedread(vp->v_object, uobj, len, uio); 608 if ((error != 0) || (resid == uio->uio_resid)) 609 break; 610 } 611 612 out: 613 614 return error; 615 } 616 617 /* --------------------------------------------------------------------- */ 618 619 static int 620 tmpfs_mappedwrite(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 621 { 622 vm_pindex_t idx; 623 vm_page_t vpg, tpg; 624 vm_offset_t offset; 625 off_t addr; 626 size_t tlen; 627 int error; 628 629 error = 0; 630 631 addr = uio->uio_offset; 632 idx = OFF_TO_IDX(addr); 633 offset = addr & PAGE_MASK; 634 tlen = MIN(PAGE_SIZE - offset, len); 635 636 if ((vobj == NULL) || 637 (vobj->resident_page_count == 0 && vobj->cache == NULL)) { 638 vpg = NULL; 639 goto nocache; 640 } 641 642 VM_OBJECT_LOCK(vobj); 643 lookupvpg: 644 if (((vpg = vm_page_lookup(vobj, idx)) != NULL) && 645 vm_page_is_valid(vpg, offset, tlen)) { 646 if ((vpg->oflags & VPO_BUSY) != 0) { 647 /* 648 * Reference the page before unlocking and sleeping so 649 * that the page daemon is less likely to reclaim it. 650 */ 651 vm_page_lock_queues(); 652 vm_page_flag_set(vpg, PG_REFERENCED); 653 vm_page_sleep(vpg, "tmfsmw"); 654 goto lookupvpg; 655 } 656 vm_page_busy(vpg); 657 vm_page_lock_queues(); 658 vm_page_undirty(vpg); 659 vm_page_unlock_queues(); 660 VM_OBJECT_UNLOCK(vobj); 661 error = uiomove_fromphys(&vpg, offset, tlen, uio); 662 } else { 663 if (__predict_false(vobj->cache != NULL)) 664 vm_page_cache_free(vobj, idx, idx + 1); 665 VM_OBJECT_UNLOCK(vobj); 666 vpg = NULL; 667 } 668 nocache: 669 VM_OBJECT_LOCK(tobj); 670 vm_object_pip_add(tobj, 1); 671 tpg = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 672 VM_ALLOC_ZERO | VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 673 if (tpg->valid != VM_PAGE_BITS_ALL) { 674 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 675 error = vm_pager_get_pages(tobj, &tpg, 1, 0); 676 if (error != 0) { 677 printf("tmpfs get pages from pager error [write]\n"); 678 goto out; 679 } 680 } else 681 vm_page_zero_invalid(tpg, TRUE); 682 } 683 VM_OBJECT_UNLOCK(tobj); 684 if (vpg == NULL) 685 error = uiomove_fromphys(&tpg, offset, tlen, uio); 686 else { 687 KASSERT(vpg->valid == VM_PAGE_BITS_ALL, ("parts of vpg invalid")); 688 pmap_copy_page(vpg, tpg); 689 } 690 VM_OBJECT_LOCK(tobj); 691 out: 692 if (vobj != NULL) 693 VM_OBJECT_LOCK(vobj); 694 vm_page_lock_queues(); 695 if (error == 0) { 696 KASSERT(tpg->valid == VM_PAGE_BITS_ALL, 697 ("parts of tpg invalid")); 698 vm_page_dirty(tpg); 699 } 700 vm_page_unwire(tpg, TRUE); 701 vm_page_unlock_queues(); 702 vm_page_wakeup(tpg); 703 if (vpg != NULL) 704 vm_page_wakeup(vpg); 705 if (vobj != NULL) 706 VM_OBJECT_UNLOCK(vobj); 707 vm_object_pip_subtract(tobj, 1); 708 VM_OBJECT_UNLOCK(tobj); 709 710 return (error); 711 } 712 713 static int 714 tmpfs_write(struct vop_write_args *v) 715 { 716 struct vnode *vp = v->a_vp; 717 struct uio *uio = v->a_uio; 718 int ioflag = v->a_ioflag; 719 struct thread *td = uio->uio_td; 720 721 boolean_t extended; 722 int error = 0; 723 off_t oldsize; 724 struct tmpfs_node *node; 725 vm_object_t uobj; 726 size_t len; 727 int resid; 728 729 node = VP_TO_TMPFS_NODE(vp); 730 oldsize = node->tn_size; 731 732 if (uio->uio_offset < 0 || vp->v_type != VREG) { 733 error = EINVAL; 734 goto out; 735 } 736 737 if (uio->uio_resid == 0) { 738 error = 0; 739 goto out; 740 } 741 742 if (ioflag & IO_APPEND) 743 uio->uio_offset = node->tn_size; 744 745 if (uio->uio_offset + uio->uio_resid > 746 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 747 return (EFBIG); 748 749 if (vp->v_type == VREG && td != NULL) { 750 PROC_LOCK(td->td_proc); 751 if (uio->uio_offset + uio->uio_resid > 752 lim_cur(td->td_proc, RLIMIT_FSIZE)) { 753 psignal(td->td_proc, SIGXFSZ); 754 PROC_UNLOCK(td->td_proc); 755 return (EFBIG); 756 } 757 PROC_UNLOCK(td->td_proc); 758 } 759 760 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 761 if (extended) { 762 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 763 if (error != 0) 764 goto out; 765 } 766 767 uobj = node->tn_reg.tn_aobj; 768 while ((resid = uio->uio_resid) > 0) { 769 if (node->tn_size <= uio->uio_offset) 770 break; 771 len = MIN(node->tn_size - uio->uio_offset, resid); 772 if (len == 0) 773 break; 774 error = tmpfs_mappedwrite(vp->v_object, uobj, len, uio); 775 if ((error != 0) || (resid == uio->uio_resid)) 776 break; 777 } 778 779 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 780 (extended ? TMPFS_NODE_CHANGED : 0); 781 782 if (node->tn_mode & (S_ISUID | S_ISGID)) { 783 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 784 node->tn_mode &= ~(S_ISUID | S_ISGID); 785 } 786 787 if (error != 0) 788 (void)tmpfs_reg_resize(vp, oldsize); 789 790 out: 791 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 792 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 793 794 return error; 795 } 796 797 /* --------------------------------------------------------------------- */ 798 799 static int 800 tmpfs_fsync(struct vop_fsync_args *v) 801 { 802 struct vnode *vp = v->a_vp; 803 804 MPASS(VOP_ISLOCKED(vp)); 805 806 tmpfs_update(vp); 807 808 return 0; 809 } 810 811 /* --------------------------------------------------------------------- */ 812 813 static int 814 tmpfs_remove(struct vop_remove_args *v) 815 { 816 struct vnode *dvp = v->a_dvp; 817 struct vnode *vp = v->a_vp; 818 819 int error; 820 struct tmpfs_dirent *de; 821 struct tmpfs_mount *tmp; 822 struct tmpfs_node *dnode; 823 struct tmpfs_node *node; 824 825 MPASS(VOP_ISLOCKED(dvp)); 826 MPASS(VOP_ISLOCKED(vp)); 827 828 if (vp->v_type == VDIR) { 829 error = EISDIR; 830 goto out; 831 } 832 833 dnode = VP_TO_TMPFS_DIR(dvp); 834 node = VP_TO_TMPFS_NODE(vp); 835 tmp = VFS_TO_TMPFS(vp->v_mount); 836 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 837 MPASS(de != NULL); 838 839 /* Files marked as immutable or append-only cannot be deleted. */ 840 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 841 (dnode->tn_flags & APPEND)) { 842 error = EPERM; 843 goto out; 844 } 845 846 /* Remove the entry from the directory; as it is a file, we do not 847 * have to change the number of hard links of the directory. */ 848 tmpfs_dir_detach(dvp, de); 849 850 /* Free the directory entry we just deleted. Note that the node 851 * referred by it will not be removed until the vnode is really 852 * reclaimed. */ 853 tmpfs_free_dirent(tmp, de, TRUE); 854 855 if (node->tn_links > 0) 856 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 857 TMPFS_NODE_MODIFIED; 858 error = 0; 859 860 out: 861 862 return error; 863 } 864 865 /* --------------------------------------------------------------------- */ 866 867 static int 868 tmpfs_link(struct vop_link_args *v) 869 { 870 struct vnode *dvp = v->a_tdvp; 871 struct vnode *vp = v->a_vp; 872 struct componentname *cnp = v->a_cnp; 873 874 int error; 875 struct tmpfs_dirent *de; 876 struct tmpfs_node *node; 877 878 MPASS(VOP_ISLOCKED(dvp)); 879 MPASS(cnp->cn_flags & HASBUF); 880 MPASS(dvp != vp); /* XXX When can this be false? */ 881 882 node = VP_TO_TMPFS_NODE(vp); 883 884 /* XXX: Why aren't the following two tests done by the caller? */ 885 886 /* Hard links of directories are forbidden. */ 887 if (vp->v_type == VDIR) { 888 error = EPERM; 889 goto out; 890 } 891 892 /* Cannot create cross-device links. */ 893 if (dvp->v_mount != vp->v_mount) { 894 error = EXDEV; 895 goto out; 896 } 897 898 /* Ensure that we do not overflow the maximum number of links imposed 899 * by the system. */ 900 MPASS(node->tn_links <= LINK_MAX); 901 if (node->tn_links == LINK_MAX) { 902 error = EMLINK; 903 goto out; 904 } 905 906 /* We cannot create links of files marked immutable or append-only. */ 907 if (node->tn_flags & (IMMUTABLE | APPEND)) { 908 error = EPERM; 909 goto out; 910 } 911 912 /* Allocate a new directory entry to represent the node. */ 913 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 914 cnp->cn_nameptr, cnp->cn_namelen, &de); 915 if (error != 0) 916 goto out; 917 918 /* Insert the new directory entry into the appropriate directory. */ 919 tmpfs_dir_attach(dvp, de); 920 921 /* vp link count has changed, so update node times. */ 922 node->tn_status |= TMPFS_NODE_CHANGED; 923 tmpfs_update(vp); 924 925 error = 0; 926 927 out: 928 return error; 929 } 930 931 /* --------------------------------------------------------------------- */ 932 933 static int 934 tmpfs_rename(struct vop_rename_args *v) 935 { 936 struct vnode *fdvp = v->a_fdvp; 937 struct vnode *fvp = v->a_fvp; 938 struct componentname *fcnp = v->a_fcnp; 939 struct vnode *tdvp = v->a_tdvp; 940 struct vnode *tvp = v->a_tvp; 941 struct componentname *tcnp = v->a_tcnp; 942 943 char *newname; 944 int error; 945 struct tmpfs_dirent *de; 946 struct tmpfs_mount *tmp; 947 struct tmpfs_node *fdnode; 948 struct tmpfs_node *fnode; 949 struct tmpfs_node *tnode; 950 struct tmpfs_node *tdnode; 951 952 MPASS(VOP_ISLOCKED(tdvp)); 953 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 954 MPASS(fcnp->cn_flags & HASBUF); 955 MPASS(tcnp->cn_flags & HASBUF); 956 957 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 958 959 /* Disallow cross-device renames. 960 * XXX Why isn't this done by the caller? */ 961 if (fvp->v_mount != tdvp->v_mount || 962 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 963 error = EXDEV; 964 goto out; 965 } 966 967 tmp = VFS_TO_TMPFS(tdvp->v_mount); 968 tdnode = VP_TO_TMPFS_DIR(tdvp); 969 970 /* If source and target are the same file, there is nothing to do. */ 971 if (fvp == tvp) { 972 error = 0; 973 goto out; 974 } 975 976 /* If we need to move the directory between entries, lock the 977 * source so that we can safely operate on it. */ 978 if (tdvp != fdvp) { 979 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 980 if (error != 0) 981 goto out; 982 } 983 fdnode = VP_TO_TMPFS_DIR(fdvp); 984 fnode = VP_TO_TMPFS_NODE(fvp); 985 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 986 987 /* Avoid manipulating '.' and '..' entries. */ 988 if (de == NULL) { 989 MPASS(fvp->v_type == VDIR); 990 error = EINVAL; 991 goto out_locked; 992 } 993 MPASS(de->td_node == fnode); 994 995 /* If re-naming a directory to another preexisting directory 996 * ensure that the target directory is empty so that its 997 * removal causes no side effects. 998 * Kern_rename gurantees the destination to be a directory 999 * if the source is one. */ 1000 if (tvp != NULL) { 1001 MPASS(tnode != NULL); 1002 1003 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 1004 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 1005 error = EPERM; 1006 goto out_locked; 1007 } 1008 1009 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 1010 if (tnode->tn_size > 0) { 1011 error = ENOTEMPTY; 1012 goto out_locked; 1013 } 1014 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 1015 error = ENOTDIR; 1016 goto out_locked; 1017 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 1018 error = EISDIR; 1019 goto out_locked; 1020 } else { 1021 MPASS(fnode->tn_type != VDIR && 1022 tnode->tn_type != VDIR); 1023 } 1024 } 1025 1026 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 1027 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 1028 error = EPERM; 1029 goto out_locked; 1030 } 1031 1032 /* Ensure that we have enough memory to hold the new name, if it 1033 * has to be changed. */ 1034 if (fcnp->cn_namelen != tcnp->cn_namelen || 1035 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 1036 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 1037 } else 1038 newname = NULL; 1039 1040 /* If the node is being moved to another directory, we have to do 1041 * the move. */ 1042 if (fdnode != tdnode) { 1043 /* In case we are moving a directory, we have to adjust its 1044 * parent to point to the new parent. */ 1045 if (de->td_node->tn_type == VDIR) { 1046 struct tmpfs_node *n; 1047 1048 /* Ensure the target directory is not a child of the 1049 * directory being moved. Otherwise, we'd end up 1050 * with stale nodes. */ 1051 n = tdnode; 1052 /* TMPFS_LOCK garanties that no nodes are freed while 1053 * traversing the list. Nodes can only be marked as 1054 * removed: tn_parent == NULL. */ 1055 TMPFS_LOCK(tmp); 1056 TMPFS_NODE_LOCK(n); 1057 while (n != n->tn_dir.tn_parent) { 1058 struct tmpfs_node *parent; 1059 1060 if (n == fnode) { 1061 TMPFS_NODE_UNLOCK(n); 1062 TMPFS_UNLOCK(tmp); 1063 error = EINVAL; 1064 if (newname != NULL) 1065 free(newname, M_TMPFSNAME); 1066 goto out_locked; 1067 } 1068 parent = n->tn_dir.tn_parent; 1069 TMPFS_NODE_UNLOCK(n); 1070 if (parent == NULL) { 1071 n = NULL; 1072 break; 1073 } 1074 TMPFS_NODE_LOCK(parent); 1075 if (parent->tn_dir.tn_parent == NULL) { 1076 TMPFS_NODE_UNLOCK(parent); 1077 n = NULL; 1078 break; 1079 } 1080 n = parent; 1081 } 1082 TMPFS_UNLOCK(tmp); 1083 if (n == NULL) { 1084 error = EINVAL; 1085 if (newname != NULL) 1086 free(newname, M_TMPFSNAME); 1087 goto out_locked; 1088 } 1089 TMPFS_NODE_UNLOCK(n); 1090 1091 /* Adjust the parent pointer. */ 1092 TMPFS_VALIDATE_DIR(fnode); 1093 TMPFS_NODE_LOCK(de->td_node); 1094 de->td_node->tn_dir.tn_parent = tdnode; 1095 TMPFS_NODE_UNLOCK(de->td_node); 1096 1097 /* As a result of changing the target of the '..' 1098 * entry, the link count of the source and target 1099 * directories has to be adjusted. */ 1100 TMPFS_NODE_LOCK(tdnode); 1101 TMPFS_ASSERT_LOCKED(tdnode); 1102 tdnode->tn_links++; 1103 TMPFS_NODE_UNLOCK(tdnode); 1104 1105 TMPFS_NODE_LOCK(fdnode); 1106 TMPFS_ASSERT_LOCKED(fdnode); 1107 fdnode->tn_links--; 1108 TMPFS_NODE_UNLOCK(fdnode); 1109 } 1110 1111 /* Do the move: just remove the entry from the source directory 1112 * and insert it into the target one. */ 1113 tmpfs_dir_detach(fdvp, de); 1114 tmpfs_dir_attach(tdvp, de); 1115 } 1116 1117 /* If the name has changed, we need to make it effective by changing 1118 * it in the directory entry. */ 1119 if (newname != NULL) { 1120 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1121 1122 free(de->td_name, M_TMPFSNAME); 1123 de->td_namelen = (uint16_t)tcnp->cn_namelen; 1124 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 1125 de->td_name = newname; 1126 1127 fnode->tn_status |= TMPFS_NODE_CHANGED; 1128 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1129 } 1130 1131 /* If we are overwriting an entry, we have to remove the old one 1132 * from the target directory. */ 1133 if (tvp != NULL) { 1134 /* Remove the old entry from the target directory. */ 1135 de = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1136 tmpfs_dir_detach(tdvp, de); 1137 1138 /* Free the directory entry we just deleted. Note that the 1139 * node referred by it will not be removed until the vnode is 1140 * really reclaimed. */ 1141 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 1142 } 1143 1144 error = 0; 1145 1146 out_locked: 1147 if (fdnode != tdnode) 1148 VOP_UNLOCK(fdvp, 0); 1149 1150 out: 1151 /* Release target nodes. */ 1152 /* XXX: I don't understand when tdvp can be the same as tvp, but 1153 * other code takes care of this... */ 1154 if (tdvp == tvp) 1155 vrele(tdvp); 1156 else 1157 vput(tdvp); 1158 if (tvp != NULL) 1159 vput(tvp); 1160 1161 /* Release source nodes. */ 1162 vrele(fdvp); 1163 vrele(fvp); 1164 1165 return error; 1166 } 1167 1168 /* --------------------------------------------------------------------- */ 1169 1170 static int 1171 tmpfs_mkdir(struct vop_mkdir_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 1178 MPASS(vap->va_type == VDIR); 1179 1180 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1181 } 1182 1183 /* --------------------------------------------------------------------- */ 1184 1185 static int 1186 tmpfs_rmdir(struct vop_rmdir_args *v) 1187 { 1188 struct vnode *dvp = v->a_dvp; 1189 struct vnode *vp = v->a_vp; 1190 1191 int error; 1192 struct tmpfs_dirent *de; 1193 struct tmpfs_mount *tmp; 1194 struct tmpfs_node *dnode; 1195 struct tmpfs_node *node; 1196 1197 MPASS(VOP_ISLOCKED(dvp)); 1198 MPASS(VOP_ISLOCKED(vp)); 1199 1200 tmp = VFS_TO_TMPFS(dvp->v_mount); 1201 dnode = VP_TO_TMPFS_DIR(dvp); 1202 node = VP_TO_TMPFS_DIR(vp); 1203 1204 /* Directories with more than two entries ('.' and '..') cannot be 1205 * removed. */ 1206 if (node->tn_size > 0) { 1207 error = ENOTEMPTY; 1208 goto out; 1209 } 1210 1211 if ((dnode->tn_flags & APPEND) 1212 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1213 error = EPERM; 1214 goto out; 1215 } 1216 1217 /* This invariant holds only if we are not trying to remove "..". 1218 * We checked for that above so this is safe now. */ 1219 MPASS(node->tn_dir.tn_parent == dnode); 1220 1221 /* Get the directory entry associated with node (vp). This was 1222 * filled by tmpfs_lookup while looking up the entry. */ 1223 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1224 MPASS(TMPFS_DIRENT_MATCHES(de, 1225 v->a_cnp->cn_nameptr, 1226 v->a_cnp->cn_namelen)); 1227 1228 /* Check flags to see if we are allowed to remove the directory. */ 1229 if (dnode->tn_flags & APPEND 1230 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1231 error = EPERM; 1232 goto out; 1233 } 1234 1235 1236 /* Detach the directory entry from the directory (dnode). */ 1237 tmpfs_dir_detach(dvp, de); 1238 1239 /* No vnode should be allocated for this entry from this point */ 1240 TMPFS_NODE_LOCK(node); 1241 TMPFS_ASSERT_ELOCKED(node); 1242 node->tn_links--; 1243 node->tn_dir.tn_parent = NULL; 1244 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1245 TMPFS_NODE_MODIFIED; 1246 1247 TMPFS_NODE_UNLOCK(node); 1248 1249 TMPFS_NODE_LOCK(dnode); 1250 TMPFS_ASSERT_ELOCKED(dnode); 1251 dnode->tn_links--; 1252 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1253 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1254 TMPFS_NODE_UNLOCK(dnode); 1255 1256 cache_purge(dvp); 1257 cache_purge(vp); 1258 1259 /* Free the directory entry we just deleted. Note that the node 1260 * referred by it will not be removed until the vnode is really 1261 * reclaimed. */ 1262 tmpfs_free_dirent(tmp, de, TRUE); 1263 1264 /* Release the deleted vnode (will destroy the node, notify 1265 * interested parties and clean it from the cache). */ 1266 1267 dnode->tn_status |= TMPFS_NODE_CHANGED; 1268 tmpfs_update(dvp); 1269 1270 error = 0; 1271 1272 out: 1273 return error; 1274 } 1275 1276 /* --------------------------------------------------------------------- */ 1277 1278 static int 1279 tmpfs_symlink(struct vop_symlink_args *v) 1280 { 1281 struct vnode *dvp = v->a_dvp; 1282 struct vnode **vpp = v->a_vpp; 1283 struct componentname *cnp = v->a_cnp; 1284 struct vattr *vap = v->a_vap; 1285 char *target = v->a_target; 1286 1287 #ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1288 MPASS(vap->va_type == VLNK); 1289 #else 1290 vap->va_type = VLNK; 1291 #endif 1292 1293 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1294 } 1295 1296 /* --------------------------------------------------------------------- */ 1297 1298 static int 1299 tmpfs_readdir(struct vop_readdir_args *v) 1300 { 1301 struct vnode *vp = v->a_vp; 1302 struct uio *uio = v->a_uio; 1303 int *eofflag = v->a_eofflag; 1304 u_long **cookies = v->a_cookies; 1305 int *ncookies = v->a_ncookies; 1306 1307 int error; 1308 off_t startoff; 1309 off_t cnt = 0; 1310 struct tmpfs_node *node; 1311 1312 /* This operation only makes sense on directory nodes. */ 1313 if (vp->v_type != VDIR) 1314 return ENOTDIR; 1315 1316 node = VP_TO_TMPFS_DIR(vp); 1317 1318 startoff = uio->uio_offset; 1319 1320 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1321 error = tmpfs_dir_getdotdent(node, uio); 1322 if (error != 0) 1323 goto outok; 1324 cnt++; 1325 } 1326 1327 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1328 error = tmpfs_dir_getdotdotdent(node, uio); 1329 if (error != 0) 1330 goto outok; 1331 cnt++; 1332 } 1333 1334 error = tmpfs_dir_getdents(node, uio, &cnt); 1335 1336 outok: 1337 MPASS(error >= -1); 1338 1339 if (error == -1) 1340 error = 0; 1341 1342 if (eofflag != NULL) 1343 *eofflag = 1344 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1345 1346 /* Update NFS-related variables. */ 1347 if (error == 0 && cookies != NULL && ncookies != NULL) { 1348 off_t i; 1349 off_t off = startoff; 1350 struct tmpfs_dirent *de = NULL; 1351 1352 *ncookies = cnt; 1353 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1354 1355 for (i = 0; i < cnt; i++) { 1356 MPASS(off != TMPFS_DIRCOOKIE_EOF); 1357 if (off == TMPFS_DIRCOOKIE_DOT) { 1358 off = TMPFS_DIRCOOKIE_DOTDOT; 1359 } else { 1360 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1361 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead); 1362 } else if (de != NULL) { 1363 de = TAILQ_NEXT(de, td_entries); 1364 } else { 1365 de = tmpfs_dir_lookupbycookie(node, 1366 off); 1367 MPASS(de != NULL); 1368 de = TAILQ_NEXT(de, td_entries); 1369 } 1370 if (de == NULL) 1371 off = TMPFS_DIRCOOKIE_EOF; 1372 else 1373 off = tmpfs_dircookie(de); 1374 } 1375 1376 (*cookies)[i] = off; 1377 } 1378 MPASS(uio->uio_offset == off); 1379 } 1380 1381 return error; 1382 } 1383 1384 /* --------------------------------------------------------------------- */ 1385 1386 static int 1387 tmpfs_readlink(struct vop_readlink_args *v) 1388 { 1389 struct vnode *vp = v->a_vp; 1390 struct uio *uio = v->a_uio; 1391 1392 int error; 1393 struct tmpfs_node *node; 1394 1395 MPASS(uio->uio_offset == 0); 1396 MPASS(vp->v_type == VLNK); 1397 1398 node = VP_TO_TMPFS_NODE(vp); 1399 1400 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1401 uio); 1402 node->tn_status |= TMPFS_NODE_ACCESSED; 1403 1404 return error; 1405 } 1406 1407 /* --------------------------------------------------------------------- */ 1408 1409 static int 1410 tmpfs_inactive(struct vop_inactive_args *v) 1411 { 1412 struct vnode *vp = v->a_vp; 1413 struct thread *l = v->a_td; 1414 1415 struct tmpfs_node *node; 1416 1417 MPASS(VOP_ISLOCKED(vp)); 1418 1419 node = VP_TO_TMPFS_NODE(vp); 1420 1421 if (node->tn_links == 0) 1422 vrecycle(vp, l); 1423 1424 return 0; 1425 } 1426 1427 /* --------------------------------------------------------------------- */ 1428 1429 int 1430 tmpfs_reclaim(struct vop_reclaim_args *v) 1431 { 1432 struct vnode *vp = v->a_vp; 1433 1434 struct tmpfs_mount *tmp; 1435 struct tmpfs_node *node; 1436 1437 node = VP_TO_TMPFS_NODE(vp); 1438 tmp = VFS_TO_TMPFS(vp->v_mount); 1439 1440 vnode_destroy_vobject(vp); 1441 cache_purge(vp); 1442 1443 TMPFS_NODE_LOCK(node); 1444 TMPFS_ASSERT_ELOCKED(node); 1445 tmpfs_free_vp(vp); 1446 1447 /* If the node referenced by this vnode was deleted by the user, 1448 * we must free its associated data structures (now that the vnode 1449 * is being reclaimed). */ 1450 if (node->tn_links == 0 && 1451 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1452 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1453 TMPFS_NODE_UNLOCK(node); 1454 tmpfs_free_node(tmp, node); 1455 } else 1456 TMPFS_NODE_UNLOCK(node); 1457 1458 MPASS(vp->v_data == NULL); 1459 return 0; 1460 } 1461 1462 /* --------------------------------------------------------------------- */ 1463 1464 static int 1465 tmpfs_print(struct vop_print_args *v) 1466 { 1467 struct vnode *vp = v->a_vp; 1468 1469 struct tmpfs_node *node; 1470 1471 node = VP_TO_TMPFS_NODE(vp); 1472 1473 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1474 node, node->tn_flags, node->tn_links); 1475 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1476 ", status 0x%x\n", 1477 node->tn_mode, node->tn_uid, node->tn_gid, 1478 (uintmax_t)node->tn_size, node->tn_status); 1479 1480 if (vp->v_type == VFIFO) 1481 fifo_printinfo(vp); 1482 1483 printf("\n"); 1484 1485 return 0; 1486 } 1487 1488 /* --------------------------------------------------------------------- */ 1489 1490 static int 1491 tmpfs_pathconf(struct vop_pathconf_args *v) 1492 { 1493 int name = v->a_name; 1494 register_t *retval = v->a_retval; 1495 1496 int error; 1497 1498 error = 0; 1499 1500 switch (name) { 1501 case _PC_LINK_MAX: 1502 *retval = LINK_MAX; 1503 break; 1504 1505 case _PC_NAME_MAX: 1506 *retval = NAME_MAX; 1507 break; 1508 1509 case _PC_PATH_MAX: 1510 *retval = PATH_MAX; 1511 break; 1512 1513 case _PC_PIPE_BUF: 1514 *retval = PIPE_BUF; 1515 break; 1516 1517 case _PC_CHOWN_RESTRICTED: 1518 *retval = 1; 1519 break; 1520 1521 case _PC_NO_TRUNC: 1522 *retval = 1; 1523 break; 1524 1525 case _PC_SYNC_IO: 1526 *retval = 1; 1527 break; 1528 1529 case _PC_FILESIZEBITS: 1530 *retval = 0; /* XXX Don't know which value should I return. */ 1531 break; 1532 1533 default: 1534 error = EINVAL; 1535 } 1536 1537 return error; 1538 } 1539 1540 static int 1541 tmpfs_vptofh(struct vop_vptofh_args *ap) 1542 { 1543 struct tmpfs_fid *tfhp; 1544 struct tmpfs_node *node; 1545 1546 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1547 node = VP_TO_TMPFS_NODE(ap->a_vp); 1548 1549 tfhp->tf_len = sizeof(struct tmpfs_fid); 1550 tfhp->tf_id = node->tn_id; 1551 tfhp->tf_gen = node->tn_gen; 1552 1553 return (0); 1554 } 1555 1556 /* --------------------------------------------------------------------- */ 1557 1558 /* 1559 * vnode operations vector used for files stored in a tmpfs file system. 1560 */ 1561 struct vop_vector tmpfs_vnodeop_entries = { 1562 .vop_default = &default_vnodeops, 1563 .vop_lookup = vfs_cache_lookup, 1564 .vop_cachedlookup = tmpfs_lookup, 1565 .vop_create = tmpfs_create, 1566 .vop_mknod = tmpfs_mknod, 1567 .vop_open = tmpfs_open, 1568 .vop_close = tmpfs_close, 1569 .vop_access = tmpfs_access, 1570 .vop_getattr = tmpfs_getattr, 1571 .vop_setattr = tmpfs_setattr, 1572 .vop_read = tmpfs_read, 1573 .vop_write = tmpfs_write, 1574 .vop_fsync = tmpfs_fsync, 1575 .vop_remove = tmpfs_remove, 1576 .vop_link = tmpfs_link, 1577 .vop_rename = tmpfs_rename, 1578 .vop_mkdir = tmpfs_mkdir, 1579 .vop_rmdir = tmpfs_rmdir, 1580 .vop_symlink = tmpfs_symlink, 1581 .vop_readdir = tmpfs_readdir, 1582 .vop_readlink = tmpfs_readlink, 1583 .vop_inactive = tmpfs_inactive, 1584 .vop_reclaim = tmpfs_reclaim, 1585 .vop_print = tmpfs_print, 1586 .vop_pathconf = tmpfs_pathconf, 1587 .vop_vptofh = tmpfs_vptofh, 1588 .vop_bmap = VOP_EOPNOTSUPP, 1589 }; 1590 1591