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/sched.h> 46 #include <sys/sf_buf.h> 47 #include <sys/stat.h> 48 #include <sys/systm.h> 49 #include <sys/unistd.h> 50 #include <sys/vnode.h> 51 52 #include <vm/vm.h> 53 #include <vm/vm_object.h> 54 #include <vm/vm_page.h> 55 #include <vm/vm_pager.h> 56 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 72 int error; 73 struct tmpfs_dirent *de; 74 struct tmpfs_node *dnode; 75 76 dnode = VP_TO_TMPFS_DIR(dvp); 77 *vpp = NULLVP; 78 79 /* Check accessibility of requested node as a first step. */ 80 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread); 81 if (error != 0) 82 goto out; 83 84 /* We cannot be requesting the parent directory of the root node. */ 85 MPASS(IMPLIES(dnode->tn_type == VDIR && 86 dnode->tn_dir.tn_parent == dnode, 87 !(cnp->cn_flags & ISDOTDOT))); 88 89 TMPFS_ASSERT_LOCKED(dnode); 90 if (dnode->tn_dir.tn_parent == NULL) { 91 error = ENOENT; 92 goto out; 93 } 94 if (cnp->cn_flags & ISDOTDOT) { 95 int ltype = 0; 96 97 ltype = VOP_ISLOCKED(dvp); 98 vhold(dvp); 99 VOP_UNLOCK(dvp, 0); 100 /* Allocate a new vnode on the matching entry. */ 101 error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent, 102 cnp->cn_lkflags, vpp); 103 104 vn_lock(dvp, ltype | LK_RETRY); 105 vdrop(dvp); 106 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 107 VREF(dvp); 108 *vpp = dvp; 109 error = 0; 110 } else { 111 de = tmpfs_dir_lookup(dnode, NULL, cnp); 112 if (de != NULL && de->td_node == NULL) 113 cnp->cn_flags |= ISWHITEOUT; 114 if (de == NULL || de->td_node == NULL) { 115 /* The entry was not found in the directory. 116 * This is OK if we are creating or renaming an 117 * entry and are working on the last component of 118 * the path name. */ 119 if ((cnp->cn_flags & ISLASTCN) && 120 (cnp->cn_nameiop == CREATE || \ 121 cnp->cn_nameiop == RENAME || 122 (cnp->cn_nameiop == DELETE && 123 cnp->cn_flags & DOWHITEOUT && 124 cnp->cn_flags & ISWHITEOUT))) { 125 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 126 cnp->cn_thread); 127 if (error != 0) 128 goto out; 129 130 /* Keep the component name in the buffer for 131 * future uses. */ 132 cnp->cn_flags |= SAVENAME; 133 134 error = EJUSTRETURN; 135 } else 136 error = ENOENT; 137 } else { 138 struct tmpfs_node *tnode; 139 140 /* The entry was found, so get its associated 141 * tmpfs_node. */ 142 tnode = de->td_node; 143 144 /* If we are not at the last path component and 145 * found a non-directory or non-link entry (which 146 * may itself be pointing to a directory), raise 147 * an error. */ 148 if ((tnode->tn_type != VDIR && 149 tnode->tn_type != VLNK) && 150 !(cnp->cn_flags & ISLASTCN)) { 151 error = ENOTDIR; 152 goto out; 153 } 154 155 /* If we are deleting or renaming the entry, keep 156 * track of its tmpfs_dirent so that it can be 157 * easily deleted later. */ 158 if ((cnp->cn_flags & ISLASTCN) && 159 (cnp->cn_nameiop == DELETE || 160 cnp->cn_nameiop == RENAME)) { 161 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 162 cnp->cn_thread); 163 if (error != 0) 164 goto out; 165 166 /* Allocate a new vnode on the matching entry. */ 167 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 168 cnp->cn_lkflags, vpp); 169 if (error != 0) 170 goto out; 171 172 if ((dnode->tn_mode & S_ISTXT) && 173 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, cnp->cn_thread) && 174 VOP_ACCESS(*vpp, VADMIN, cnp->cn_cred, cnp->cn_thread)) { 175 error = EPERM; 176 vput(*vpp); 177 *vpp = NULL; 178 goto out; 179 } 180 cnp->cn_flags |= SAVENAME; 181 } else { 182 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 183 cnp->cn_lkflags, vpp); 184 } 185 } 186 } 187 188 /* Store the result of this lookup in the cache. Avoid this if the 189 * request was for creation, as it does not improve timings on 190 * emprical tests. */ 191 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) 192 cache_enter(dvp, *vpp, cnp); 193 194 out: 195 /* If there were no errors, *vpp cannot be null and it must be 196 * locked. */ 197 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp))); 198 199 return error; 200 } 201 202 /* --------------------------------------------------------------------- */ 203 204 static int 205 tmpfs_create(struct vop_create_args *v) 206 { 207 struct vnode *dvp = v->a_dvp; 208 struct vnode **vpp = v->a_vpp; 209 struct componentname *cnp = v->a_cnp; 210 struct vattr *vap = v->a_vap; 211 212 MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 213 214 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 215 } 216 /* --------------------------------------------------------------------- */ 217 218 static int 219 tmpfs_mknod(struct vop_mknod_args *v) 220 { 221 struct vnode *dvp = v->a_dvp; 222 struct vnode **vpp = v->a_vpp; 223 struct componentname *cnp = v->a_cnp; 224 struct vattr *vap = v->a_vap; 225 226 if (vap->va_type != VBLK && vap->va_type != VCHR && 227 vap->va_type != VFIFO) 228 return EINVAL; 229 230 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 231 } 232 233 /* --------------------------------------------------------------------- */ 234 235 static int 236 tmpfs_open(struct vop_open_args *v) 237 { 238 struct vnode *vp = v->a_vp; 239 int mode = v->a_mode; 240 241 int error; 242 struct tmpfs_node *node; 243 244 MPASS(VOP_ISLOCKED(vp)); 245 246 node = VP_TO_TMPFS_NODE(vp); 247 248 /* The file is still active but all its names have been removed 249 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 250 * it is about to die. */ 251 if (node->tn_links < 1) 252 return (ENOENT); 253 254 /* If the file is marked append-only, deny write requests. */ 255 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 256 error = EPERM; 257 else { 258 error = 0; 259 vnode_create_vobject(vp, node->tn_size, v->a_td); 260 } 261 262 MPASS(VOP_ISLOCKED(vp)); 263 return error; 264 } 265 266 /* --------------------------------------------------------------------- */ 267 268 static int 269 tmpfs_close(struct vop_close_args *v) 270 { 271 struct vnode *vp = v->a_vp; 272 273 struct tmpfs_node *node; 274 275 MPASS(VOP_ISLOCKED(vp)); 276 277 node = VP_TO_TMPFS_NODE(vp); 278 279 if (node->tn_links > 0) { 280 /* Update node times. No need to do it if the node has 281 * been deleted, because it will vanish after we return. */ 282 tmpfs_update(vp); 283 } 284 285 return 0; 286 } 287 288 /* --------------------------------------------------------------------- */ 289 290 int 291 tmpfs_access(struct vop_access_args *v) 292 { 293 struct vnode *vp = v->a_vp; 294 accmode_t accmode = v->a_accmode; 295 struct ucred *cred = v->a_cred; 296 297 int error; 298 struct tmpfs_node *node; 299 300 MPASS(VOP_ISLOCKED(vp)); 301 302 node = VP_TO_TMPFS_NODE(vp); 303 304 switch (vp->v_type) { 305 case VDIR: 306 /* FALLTHROUGH */ 307 case VLNK: 308 /* FALLTHROUGH */ 309 case VREG: 310 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 311 error = EROFS; 312 goto out; 313 } 314 break; 315 316 case VBLK: 317 /* FALLTHROUGH */ 318 case VCHR: 319 /* FALLTHROUGH */ 320 case VSOCK: 321 /* FALLTHROUGH */ 322 case VFIFO: 323 break; 324 325 default: 326 error = EINVAL; 327 goto out; 328 } 329 330 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 331 error = EPERM; 332 goto out; 333 } 334 335 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 336 node->tn_gid, accmode, cred, NULL); 337 338 out: 339 MPASS(VOP_ISLOCKED(vp)); 340 341 return error; 342 } 343 344 /* --------------------------------------------------------------------- */ 345 346 int 347 tmpfs_getattr(struct vop_getattr_args *v) 348 { 349 struct vnode *vp = v->a_vp; 350 struct vattr *vap = v->a_vap; 351 352 struct tmpfs_node *node; 353 354 node = VP_TO_TMPFS_NODE(vp); 355 356 tmpfs_update(vp); 357 358 vap->va_type = vp->v_type; 359 vap->va_mode = node->tn_mode; 360 vap->va_nlink = node->tn_links; 361 vap->va_uid = node->tn_uid; 362 vap->va_gid = node->tn_gid; 363 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 364 vap->va_fileid = node->tn_id; 365 vap->va_size = node->tn_size; 366 vap->va_blocksize = PAGE_SIZE; 367 vap->va_atime = node->tn_atime; 368 vap->va_mtime = node->tn_mtime; 369 vap->va_ctime = node->tn_ctime; 370 vap->va_birthtime = node->tn_birthtime; 371 vap->va_gen = node->tn_gen; 372 vap->va_flags = node->tn_flags; 373 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 374 node->tn_rdev : NODEV; 375 vap->va_bytes = round_page(node->tn_size); 376 vap->va_filerev = 0; 377 378 return 0; 379 } 380 381 /* --------------------------------------------------------------------- */ 382 383 /* XXX Should this operation be atomic? I think it should, but code in 384 * XXX other places (e.g., ufs) doesn't seem to be... */ 385 int 386 tmpfs_setattr(struct vop_setattr_args *v) 387 { 388 struct vnode *vp = v->a_vp; 389 struct vattr *vap = v->a_vap; 390 struct ucred *cred = v->a_cred; 391 struct thread *td = curthread; 392 393 int error; 394 395 MPASS(VOP_ISLOCKED(vp)); 396 397 error = 0; 398 399 /* Abort if any unsettable attribute is given. */ 400 if (vap->va_type != VNON || 401 vap->va_nlink != VNOVAL || 402 vap->va_fsid != VNOVAL || 403 vap->va_fileid != VNOVAL || 404 vap->va_blocksize != VNOVAL || 405 vap->va_gen != VNOVAL || 406 vap->va_rdev != VNOVAL || 407 vap->va_bytes != VNOVAL) 408 error = EINVAL; 409 410 if (error == 0 && (vap->va_flags != VNOVAL)) 411 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 412 413 if (error == 0 && (vap->va_size != VNOVAL)) 414 error = tmpfs_chsize(vp, vap->va_size, cred, td); 415 416 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 417 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 418 419 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 420 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 421 422 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 423 vap->va_atime.tv_nsec != VNOVAL) || 424 (vap->va_mtime.tv_sec != VNOVAL && 425 vap->va_mtime.tv_nsec != VNOVAL) || 426 (vap->va_birthtime.tv_sec != VNOVAL && 427 vap->va_birthtime.tv_nsec != VNOVAL))) 428 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 429 &vap->va_birthtime, vap->va_vaflags, cred, td); 430 431 /* Update the node times. We give preference to the error codes 432 * generated by this function rather than the ones that may arise 433 * from tmpfs_update. */ 434 tmpfs_update(vp); 435 436 MPASS(VOP_ISLOCKED(vp)); 437 438 return error; 439 } 440 441 /* --------------------------------------------------------------------- */ 442 static int 443 tmpfs_nocacheread(vm_object_t tobj, vm_pindex_t idx, 444 vm_offset_t offset, size_t tlen, struct uio *uio) 445 { 446 vm_page_t m; 447 int error; 448 449 VM_OBJECT_LOCK(tobj); 450 vm_object_pip_add(tobj, 1); 451 m = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 452 VM_ALLOC_ZERO | VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 453 if (m->valid != VM_PAGE_BITS_ALL) { 454 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 455 error = vm_pager_get_pages(tobj, &m, 1, 0); 456 if (error != 0) { 457 printf("tmpfs get pages from pager error [read]\n"); 458 goto out; 459 } 460 } else 461 vm_page_zero_invalid(m, TRUE); 462 } 463 VM_OBJECT_UNLOCK(tobj); 464 error = uiomove_fromphys(&m, offset, tlen, uio); 465 VM_OBJECT_LOCK(tobj); 466 out: 467 vm_page_lock(m); 468 vm_page_unwire(m, TRUE); 469 vm_page_unlock(m); 470 vm_page_wakeup(m); 471 vm_object_pip_subtract(tobj, 1); 472 VM_OBJECT_UNLOCK(tobj); 473 474 return (error); 475 } 476 477 static __inline int 478 tmpfs_nocacheread_buf(vm_object_t tobj, vm_pindex_t idx, 479 vm_offset_t offset, size_t tlen, void *buf) 480 { 481 struct uio uio; 482 struct iovec iov; 483 484 uio.uio_iovcnt = 1; 485 uio.uio_iov = &iov; 486 iov.iov_base = buf; 487 iov.iov_len = tlen; 488 489 uio.uio_offset = 0; 490 uio.uio_resid = tlen; 491 uio.uio_rw = UIO_READ; 492 uio.uio_segflg = UIO_SYSSPACE; 493 uio.uio_td = curthread; 494 495 return (tmpfs_nocacheread(tobj, idx, offset, tlen, &uio)); 496 } 497 498 static int 499 tmpfs_mappedread(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 500 { 501 struct sf_buf *sf; 502 vm_pindex_t idx; 503 vm_page_t m; 504 vm_offset_t offset; 505 off_t addr; 506 size_t tlen; 507 char *ma; 508 int error; 509 510 addr = uio->uio_offset; 511 idx = OFF_TO_IDX(addr); 512 offset = addr & PAGE_MASK; 513 tlen = MIN(PAGE_SIZE - offset, len); 514 515 if ((vobj == NULL) || 516 (vobj->resident_page_count == 0 && vobj->cache == NULL)) 517 goto nocache; 518 519 VM_OBJECT_LOCK(vobj); 520 lookupvpg: 521 if (((m = vm_page_lookup(vobj, idx)) != NULL) && 522 vm_page_is_valid(m, offset, tlen)) { 523 if ((m->oflags & VPO_BUSY) != 0) { 524 /* 525 * Reference the page before unlocking and sleeping so 526 * that the page daemon is less likely to reclaim it. 527 */ 528 vm_page_lock_queues(); 529 vm_page_flag_set(m, PG_REFERENCED); 530 vm_page_sleep(m, "tmfsmr"); 531 goto lookupvpg; 532 } 533 vm_page_busy(m); 534 VM_OBJECT_UNLOCK(vobj); 535 error = uiomove_fromphys(&m, offset, tlen, uio); 536 VM_OBJECT_LOCK(vobj); 537 vm_page_wakeup(m); 538 VM_OBJECT_UNLOCK(vobj); 539 return (error); 540 } else if (m != NULL && uio->uio_segflg == UIO_NOCOPY) { 541 KASSERT(offset == 0, 542 ("unexpected offset in tmpfs_mappedread for sendfile")); 543 if ((m->oflags & VPO_BUSY) != 0) { 544 /* 545 * Reference the page before unlocking and sleeping so 546 * that the page daemon is less likely to reclaim it. 547 */ 548 vm_page_lock_queues(); 549 vm_page_flag_set(m, PG_REFERENCED); 550 vm_page_sleep(m, "tmfsmr"); 551 goto lookupvpg; 552 } 553 vm_page_busy(m); 554 VM_OBJECT_UNLOCK(vobj); 555 sched_pin(); 556 sf = sf_buf_alloc(m, SFB_CPUPRIVATE); 557 ma = (char *)sf_buf_kva(sf); 558 error = tmpfs_nocacheread_buf(tobj, idx, 0, tlen, ma); 559 if (error == 0) { 560 if (tlen != PAGE_SIZE) 561 bzero(ma + tlen, PAGE_SIZE - tlen); 562 uio->uio_offset += tlen; 563 uio->uio_resid -= tlen; 564 } 565 sf_buf_free(sf); 566 sched_unpin(); 567 VM_OBJECT_LOCK(vobj); 568 if (error == 0) 569 m->valid = VM_PAGE_BITS_ALL; 570 vm_page_wakeup(m); 571 VM_OBJECT_UNLOCK(vobj); 572 return (error); 573 } 574 VM_OBJECT_UNLOCK(vobj); 575 nocache: 576 error = tmpfs_nocacheread(tobj, idx, offset, tlen, uio); 577 578 return (error); 579 } 580 581 static int 582 tmpfs_read(struct vop_read_args *v) 583 { 584 struct vnode *vp = v->a_vp; 585 struct uio *uio = v->a_uio; 586 587 struct tmpfs_node *node; 588 vm_object_t uobj; 589 size_t len; 590 int resid; 591 592 int error = 0; 593 594 node = VP_TO_TMPFS_NODE(vp); 595 596 if (vp->v_type != VREG) { 597 error = EISDIR; 598 goto out; 599 } 600 601 if (uio->uio_offset < 0) { 602 error = EINVAL; 603 goto out; 604 } 605 606 node->tn_status |= TMPFS_NODE_ACCESSED; 607 608 uobj = node->tn_reg.tn_aobj; 609 while ((resid = uio->uio_resid) > 0) { 610 error = 0; 611 if (node->tn_size <= uio->uio_offset) 612 break; 613 len = MIN(node->tn_size - uio->uio_offset, resid); 614 if (len == 0) 615 break; 616 error = tmpfs_mappedread(vp->v_object, uobj, len, uio); 617 if ((error != 0) || (resid == uio->uio_resid)) 618 break; 619 } 620 621 out: 622 623 return error; 624 } 625 626 /* --------------------------------------------------------------------- */ 627 628 static int 629 tmpfs_mappedwrite(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 630 { 631 vm_pindex_t idx; 632 vm_page_t vpg, tpg; 633 vm_offset_t offset; 634 off_t addr; 635 size_t tlen; 636 int error; 637 638 error = 0; 639 640 addr = uio->uio_offset; 641 idx = OFF_TO_IDX(addr); 642 offset = addr & PAGE_MASK; 643 tlen = MIN(PAGE_SIZE - offset, len); 644 645 if ((vobj == NULL) || 646 (vobj->resident_page_count == 0 && vobj->cache == NULL)) { 647 vpg = NULL; 648 goto nocache; 649 } 650 651 VM_OBJECT_LOCK(vobj); 652 lookupvpg: 653 if (((vpg = vm_page_lookup(vobj, idx)) != NULL) && 654 vm_page_is_valid(vpg, offset, tlen)) { 655 if ((vpg->oflags & VPO_BUSY) != 0) { 656 /* 657 * Reference the page before unlocking and sleeping so 658 * that the page daemon is less likely to reclaim it. 659 */ 660 vm_page_lock_queues(); 661 vm_page_flag_set(vpg, PG_REFERENCED); 662 vm_page_sleep(vpg, "tmfsmw"); 663 goto lookupvpg; 664 } 665 vm_page_busy(vpg); 666 vm_page_undirty(vpg); 667 VM_OBJECT_UNLOCK(vobj); 668 error = uiomove_fromphys(&vpg, offset, tlen, uio); 669 } else { 670 if (__predict_false(vobj->cache != NULL)) 671 vm_page_cache_free(vobj, idx, idx + 1); 672 VM_OBJECT_UNLOCK(vobj); 673 vpg = NULL; 674 } 675 nocache: 676 VM_OBJECT_LOCK(tobj); 677 vm_object_pip_add(tobj, 1); 678 tpg = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 679 VM_ALLOC_ZERO | VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 680 if (tpg->valid != VM_PAGE_BITS_ALL) { 681 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 682 error = vm_pager_get_pages(tobj, &tpg, 1, 0); 683 if (error != 0) { 684 printf("tmpfs get pages from pager error [write]\n"); 685 goto out; 686 } 687 } else 688 vm_page_zero_invalid(tpg, TRUE); 689 } 690 VM_OBJECT_UNLOCK(tobj); 691 if (vpg == NULL) 692 error = uiomove_fromphys(&tpg, offset, tlen, uio); 693 else { 694 KASSERT(vpg->valid == VM_PAGE_BITS_ALL, ("parts of vpg invalid")); 695 pmap_copy_page(vpg, tpg); 696 } 697 VM_OBJECT_LOCK(tobj); 698 out: 699 if (vobj != NULL) 700 VM_OBJECT_LOCK(vobj); 701 if (error == 0) { 702 KASSERT(tpg->valid == VM_PAGE_BITS_ALL, 703 ("parts of tpg invalid")); 704 vm_page_dirty(tpg); 705 } 706 vm_page_lock(tpg); 707 vm_page_unwire(tpg, TRUE); 708 vm_page_unlock(tpg); 709 vm_page_wakeup(tpg); 710 if (vpg != NULL) 711 vm_page_wakeup(vpg); 712 if (vobj != NULL) 713 VM_OBJECT_UNLOCK(vobj); 714 vm_object_pip_subtract(tobj, 1); 715 VM_OBJECT_UNLOCK(tobj); 716 717 return (error); 718 } 719 720 static int 721 tmpfs_write(struct vop_write_args *v) 722 { 723 struct vnode *vp = v->a_vp; 724 struct uio *uio = v->a_uio; 725 int ioflag = v->a_ioflag; 726 727 boolean_t extended; 728 int error = 0; 729 off_t oldsize; 730 struct tmpfs_node *node; 731 vm_object_t uobj; 732 size_t len; 733 int resid; 734 735 node = VP_TO_TMPFS_NODE(vp); 736 oldsize = node->tn_size; 737 738 if (uio->uio_offset < 0 || vp->v_type != VREG) { 739 error = EINVAL; 740 goto out; 741 } 742 743 if (uio->uio_resid == 0) { 744 error = 0; 745 goto out; 746 } 747 748 if (ioflag & IO_APPEND) 749 uio->uio_offset = node->tn_size; 750 751 if (uio->uio_offset + uio->uio_resid > 752 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 753 return (EFBIG); 754 755 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 756 return (EFBIG); 757 758 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 759 if (extended) { 760 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 761 if (error != 0) 762 goto out; 763 } 764 765 uobj = node->tn_reg.tn_aobj; 766 while ((resid = uio->uio_resid) > 0) { 767 if (node->tn_size <= uio->uio_offset) 768 break; 769 len = MIN(node->tn_size - uio->uio_offset, resid); 770 if (len == 0) 771 break; 772 error = tmpfs_mappedwrite(vp->v_object, uobj, len, uio); 773 if ((error != 0) || (resid == uio->uio_resid)) 774 break; 775 } 776 777 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 778 (extended ? TMPFS_NODE_CHANGED : 0); 779 780 if (node->tn_mode & (S_ISUID | S_ISGID)) { 781 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 782 node->tn_mode &= ~(S_ISUID | S_ISGID); 783 } 784 785 if (error != 0) 786 (void)tmpfs_reg_resize(vp, oldsize); 787 788 out: 789 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 790 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 791 792 return error; 793 } 794 795 /* --------------------------------------------------------------------- */ 796 797 static int 798 tmpfs_fsync(struct vop_fsync_args *v) 799 { 800 struct vnode *vp = v->a_vp; 801 802 MPASS(VOP_ISLOCKED(vp)); 803 804 tmpfs_update(vp); 805 806 return 0; 807 } 808 809 /* --------------------------------------------------------------------- */ 810 811 static int 812 tmpfs_remove(struct vop_remove_args *v) 813 { 814 struct vnode *dvp = v->a_dvp; 815 struct vnode *vp = v->a_vp; 816 817 int error; 818 struct tmpfs_dirent *de; 819 struct tmpfs_mount *tmp; 820 struct tmpfs_node *dnode; 821 struct tmpfs_node *node; 822 823 MPASS(VOP_ISLOCKED(dvp)); 824 MPASS(VOP_ISLOCKED(vp)); 825 826 if (vp->v_type == VDIR) { 827 error = EISDIR; 828 goto out; 829 } 830 831 dnode = VP_TO_TMPFS_DIR(dvp); 832 node = VP_TO_TMPFS_NODE(vp); 833 tmp = VFS_TO_TMPFS(vp->v_mount); 834 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 835 MPASS(de != NULL); 836 837 /* Files marked as immutable or append-only cannot be deleted. */ 838 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 839 (dnode->tn_flags & APPEND)) { 840 error = EPERM; 841 goto out; 842 } 843 844 /* Remove the entry from the directory; as it is a file, we do not 845 * have to change the number of hard links of the directory. */ 846 tmpfs_dir_detach(dvp, de); 847 if (v->a_cnp->cn_flags & DOWHITEOUT) 848 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 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 error = 0; 858 859 out: 860 861 return error; 862 } 863 864 /* --------------------------------------------------------------------- */ 865 866 static int 867 tmpfs_link(struct vop_link_args *v) 868 { 869 struct vnode *dvp = v->a_tdvp; 870 struct vnode *vp = v->a_vp; 871 struct componentname *cnp = v->a_cnp; 872 873 int error; 874 struct tmpfs_dirent *de; 875 struct tmpfs_node *node; 876 877 MPASS(VOP_ISLOCKED(dvp)); 878 MPASS(cnp->cn_flags & HASBUF); 879 MPASS(dvp != vp); /* XXX When can this be false? */ 880 881 node = VP_TO_TMPFS_NODE(vp); 882 883 /* XXX: Why aren't the following two tests done by the caller? */ 884 885 /* Hard links of directories are forbidden. */ 886 if (vp->v_type == VDIR) { 887 error = EPERM; 888 goto out; 889 } 890 891 /* Cannot create cross-device links. */ 892 if (dvp->v_mount != vp->v_mount) { 893 error = EXDEV; 894 goto out; 895 } 896 897 /* Ensure that we do not overflow the maximum number of links imposed 898 * by the system. */ 899 MPASS(node->tn_links <= LINK_MAX); 900 if (node->tn_links == LINK_MAX) { 901 error = EMLINK; 902 goto out; 903 } 904 905 /* We cannot create links of files marked immutable or append-only. */ 906 if (node->tn_flags & (IMMUTABLE | APPEND)) { 907 error = EPERM; 908 goto out; 909 } 910 911 /* Allocate a new directory entry to represent the node. */ 912 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 913 cnp->cn_nameptr, cnp->cn_namelen, &de); 914 if (error != 0) 915 goto out; 916 917 /* Insert the new directory entry into the appropriate directory. */ 918 if (cnp->cn_flags & ISWHITEOUT) 919 tmpfs_dir_whiteout_remove(dvp, cnp); 920 tmpfs_dir_attach(dvp, de); 921 922 /* vp link count has changed, so update node times. */ 923 node->tn_status |= TMPFS_NODE_CHANGED; 924 tmpfs_update(vp); 925 926 error = 0; 927 928 out: 929 return error; 930 } 931 932 /* --------------------------------------------------------------------- */ 933 934 static int 935 tmpfs_rename(struct vop_rename_args *v) 936 { 937 struct vnode *fdvp = v->a_fdvp; 938 struct vnode *fvp = v->a_fvp; 939 struct componentname *fcnp = v->a_fcnp; 940 struct vnode *tdvp = v->a_tdvp; 941 struct vnode *tvp = v->a_tvp; 942 struct componentname *tcnp = v->a_tcnp; 943 944 char *newname; 945 int error; 946 struct tmpfs_dirent *de; 947 struct tmpfs_mount *tmp; 948 struct tmpfs_node *fdnode; 949 struct tmpfs_node *fnode; 950 struct tmpfs_node *tnode; 951 struct tmpfs_node *tdnode; 952 953 MPASS(VOP_ISLOCKED(tdvp)); 954 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 955 MPASS(fcnp->cn_flags & HASBUF); 956 MPASS(tcnp->cn_flags & HASBUF); 957 958 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 959 960 /* Disallow cross-device renames. 961 * XXX Why isn't this done by the caller? */ 962 if (fvp->v_mount != tdvp->v_mount || 963 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 964 error = EXDEV; 965 goto out; 966 } 967 968 tmp = VFS_TO_TMPFS(tdvp->v_mount); 969 tdnode = VP_TO_TMPFS_DIR(tdvp); 970 971 /* If source and target are the same file, there is nothing to do. */ 972 if (fvp == tvp) { 973 error = 0; 974 goto out; 975 } 976 977 /* If we need to move the directory between entries, lock the 978 * source so that we can safely operate on it. */ 979 if (tdvp != fdvp) { 980 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 981 if (error != 0) 982 goto out; 983 } 984 fdnode = VP_TO_TMPFS_DIR(fdvp); 985 fnode = VP_TO_TMPFS_NODE(fvp); 986 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 987 988 /* Entry can disappear before we lock fdvp, 989 * also avoid manipulating '.' and '..' entries. */ 990 if (de == NULL) { 991 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 992 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 993 error = EINVAL; 994 else 995 error = ENOENT; 996 goto out_locked; 997 } 998 MPASS(de->td_node == fnode); 999 1000 /* If re-naming a directory to another preexisting directory 1001 * ensure that the target directory is empty so that its 1002 * removal causes no side effects. 1003 * Kern_rename gurantees the destination to be a directory 1004 * if the source is one. */ 1005 if (tvp != NULL) { 1006 MPASS(tnode != NULL); 1007 1008 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 1009 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 1010 error = EPERM; 1011 goto out_locked; 1012 } 1013 1014 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 1015 if (tnode->tn_size > 0) { 1016 error = ENOTEMPTY; 1017 goto out_locked; 1018 } 1019 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 1020 error = ENOTDIR; 1021 goto out_locked; 1022 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 1023 error = EISDIR; 1024 goto out_locked; 1025 } else { 1026 MPASS(fnode->tn_type != VDIR && 1027 tnode->tn_type != VDIR); 1028 } 1029 } 1030 1031 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 1032 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 1033 error = EPERM; 1034 goto out_locked; 1035 } 1036 1037 /* Ensure that we have enough memory to hold the new name, if it 1038 * has to be changed. */ 1039 if (fcnp->cn_namelen != tcnp->cn_namelen || 1040 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 1041 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 1042 } else 1043 newname = NULL; 1044 1045 /* If the node is being moved to another directory, we have to do 1046 * the move. */ 1047 if (fdnode != tdnode) { 1048 /* In case we are moving a directory, we have to adjust its 1049 * parent to point to the new parent. */ 1050 if (de->td_node->tn_type == VDIR) { 1051 struct tmpfs_node *n; 1052 1053 /* Ensure the target directory is not a child of the 1054 * directory being moved. Otherwise, we'd end up 1055 * with stale nodes. */ 1056 n = tdnode; 1057 /* TMPFS_LOCK garanties that no nodes are freed while 1058 * traversing the list. Nodes can only be marked as 1059 * removed: tn_parent == NULL. */ 1060 TMPFS_LOCK(tmp); 1061 TMPFS_NODE_LOCK(n); 1062 while (n != n->tn_dir.tn_parent) { 1063 struct tmpfs_node *parent; 1064 1065 if (n == fnode) { 1066 TMPFS_NODE_UNLOCK(n); 1067 TMPFS_UNLOCK(tmp); 1068 error = EINVAL; 1069 if (newname != NULL) 1070 free(newname, M_TMPFSNAME); 1071 goto out_locked; 1072 } 1073 parent = n->tn_dir.tn_parent; 1074 TMPFS_NODE_UNLOCK(n); 1075 if (parent == NULL) { 1076 n = NULL; 1077 break; 1078 } 1079 TMPFS_NODE_LOCK(parent); 1080 if (parent->tn_dir.tn_parent == NULL) { 1081 TMPFS_NODE_UNLOCK(parent); 1082 n = NULL; 1083 break; 1084 } 1085 n = parent; 1086 } 1087 TMPFS_UNLOCK(tmp); 1088 if (n == NULL) { 1089 error = EINVAL; 1090 if (newname != NULL) 1091 free(newname, M_TMPFSNAME); 1092 goto out_locked; 1093 } 1094 TMPFS_NODE_UNLOCK(n); 1095 1096 /* Adjust the parent pointer. */ 1097 TMPFS_VALIDATE_DIR(fnode); 1098 TMPFS_NODE_LOCK(de->td_node); 1099 de->td_node->tn_dir.tn_parent = tdnode; 1100 TMPFS_NODE_UNLOCK(de->td_node); 1101 1102 /* As a result of changing the target of the '..' 1103 * entry, the link count of the source and target 1104 * directories has to be adjusted. */ 1105 TMPFS_NODE_LOCK(tdnode); 1106 TMPFS_ASSERT_LOCKED(tdnode); 1107 tdnode->tn_links++; 1108 TMPFS_NODE_UNLOCK(tdnode); 1109 1110 TMPFS_NODE_LOCK(fdnode); 1111 TMPFS_ASSERT_LOCKED(fdnode); 1112 fdnode->tn_links--; 1113 TMPFS_NODE_UNLOCK(fdnode); 1114 } 1115 1116 /* Do the move: just remove the entry from the source directory 1117 * and insert it into the target one. */ 1118 tmpfs_dir_detach(fdvp, de); 1119 if (fcnp->cn_flags & DOWHITEOUT) 1120 tmpfs_dir_whiteout_add(fdvp, fcnp); 1121 if (tcnp->cn_flags & ISWHITEOUT) 1122 tmpfs_dir_whiteout_remove(tdvp, tcnp); 1123 tmpfs_dir_attach(tdvp, de); 1124 } 1125 1126 /* If the name has changed, we need to make it effective by changing 1127 * it in the directory entry. */ 1128 if (newname != NULL) { 1129 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1130 1131 free(de->td_name, M_TMPFSNAME); 1132 de->td_namelen = (uint16_t)tcnp->cn_namelen; 1133 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 1134 de->td_name = newname; 1135 1136 fnode->tn_status |= TMPFS_NODE_CHANGED; 1137 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1138 } 1139 1140 /* If we are overwriting an entry, we have to remove the old one 1141 * from the target directory. */ 1142 if (tvp != NULL) { 1143 /* Remove the old entry from the target directory. */ 1144 de = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1145 tmpfs_dir_detach(tdvp, de); 1146 1147 /* Free the directory entry we just deleted. Note that the 1148 * node referred by it will not be removed until the vnode is 1149 * really reclaimed. */ 1150 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 1151 } 1152 1153 error = 0; 1154 1155 out_locked: 1156 if (fdnode != tdnode) 1157 VOP_UNLOCK(fdvp, 0); 1158 1159 out: 1160 /* Release target nodes. */ 1161 /* XXX: I don't understand when tdvp can be the same as tvp, but 1162 * other code takes care of this... */ 1163 if (tdvp == tvp) 1164 vrele(tdvp); 1165 else 1166 vput(tdvp); 1167 if (tvp != NULL) 1168 vput(tvp); 1169 1170 /* Release source nodes. */ 1171 vrele(fdvp); 1172 vrele(fvp); 1173 1174 return error; 1175 } 1176 1177 /* --------------------------------------------------------------------- */ 1178 1179 static int 1180 tmpfs_mkdir(struct vop_mkdir_args *v) 1181 { 1182 struct vnode *dvp = v->a_dvp; 1183 struct vnode **vpp = v->a_vpp; 1184 struct componentname *cnp = v->a_cnp; 1185 struct vattr *vap = v->a_vap; 1186 1187 MPASS(vap->va_type == VDIR); 1188 1189 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1190 } 1191 1192 /* --------------------------------------------------------------------- */ 1193 1194 static int 1195 tmpfs_rmdir(struct vop_rmdir_args *v) 1196 { 1197 struct vnode *dvp = v->a_dvp; 1198 struct vnode *vp = v->a_vp; 1199 1200 int error; 1201 struct tmpfs_dirent *de; 1202 struct tmpfs_mount *tmp; 1203 struct tmpfs_node *dnode; 1204 struct tmpfs_node *node; 1205 1206 MPASS(VOP_ISLOCKED(dvp)); 1207 MPASS(VOP_ISLOCKED(vp)); 1208 1209 tmp = VFS_TO_TMPFS(dvp->v_mount); 1210 dnode = VP_TO_TMPFS_DIR(dvp); 1211 node = VP_TO_TMPFS_DIR(vp); 1212 1213 /* Directories with more than two entries ('.' and '..') cannot be 1214 * removed. */ 1215 if (node->tn_size > 0) { 1216 error = ENOTEMPTY; 1217 goto out; 1218 } 1219 1220 if ((dnode->tn_flags & APPEND) 1221 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1222 error = EPERM; 1223 goto out; 1224 } 1225 1226 /* This invariant holds only if we are not trying to remove "..". 1227 * We checked for that above so this is safe now. */ 1228 MPASS(node->tn_dir.tn_parent == dnode); 1229 1230 /* Get the directory entry associated with node (vp). This was 1231 * filled by tmpfs_lookup while looking up the entry. */ 1232 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1233 MPASS(TMPFS_DIRENT_MATCHES(de, 1234 v->a_cnp->cn_nameptr, 1235 v->a_cnp->cn_namelen)); 1236 1237 /* Check flags to see if we are allowed to remove the directory. */ 1238 if (dnode->tn_flags & APPEND 1239 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1240 error = EPERM; 1241 goto out; 1242 } 1243 1244 1245 /* Detach the directory entry from the directory (dnode). */ 1246 tmpfs_dir_detach(dvp, de); 1247 if (v->a_cnp->cn_flags & DOWHITEOUT) 1248 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1249 1250 /* No vnode should be allocated for this entry from this point */ 1251 TMPFS_NODE_LOCK(node); 1252 TMPFS_ASSERT_ELOCKED(node); 1253 node->tn_links--; 1254 node->tn_dir.tn_parent = NULL; 1255 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1256 TMPFS_NODE_MODIFIED; 1257 1258 TMPFS_NODE_UNLOCK(node); 1259 1260 TMPFS_NODE_LOCK(dnode); 1261 TMPFS_ASSERT_ELOCKED(dnode); 1262 dnode->tn_links--; 1263 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1264 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1265 TMPFS_NODE_UNLOCK(dnode); 1266 1267 cache_purge(dvp); 1268 cache_purge(vp); 1269 1270 /* Free the directory entry we just deleted. Note that the node 1271 * referred by it will not be removed until the vnode is really 1272 * reclaimed. */ 1273 tmpfs_free_dirent(tmp, de, TRUE); 1274 1275 /* Release the deleted vnode (will destroy the node, notify 1276 * interested parties and clean it from the cache). */ 1277 1278 dnode->tn_status |= TMPFS_NODE_CHANGED; 1279 tmpfs_update(dvp); 1280 1281 error = 0; 1282 1283 out: 1284 return error; 1285 } 1286 1287 /* --------------------------------------------------------------------- */ 1288 1289 static int 1290 tmpfs_symlink(struct vop_symlink_args *v) 1291 { 1292 struct vnode *dvp = v->a_dvp; 1293 struct vnode **vpp = v->a_vpp; 1294 struct componentname *cnp = v->a_cnp; 1295 struct vattr *vap = v->a_vap; 1296 char *target = v->a_target; 1297 1298 #ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1299 MPASS(vap->va_type == VLNK); 1300 #else 1301 vap->va_type = VLNK; 1302 #endif 1303 1304 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1305 } 1306 1307 /* --------------------------------------------------------------------- */ 1308 1309 static int 1310 tmpfs_readdir(struct vop_readdir_args *v) 1311 { 1312 struct vnode *vp = v->a_vp; 1313 struct uio *uio = v->a_uio; 1314 int *eofflag = v->a_eofflag; 1315 u_long **cookies = v->a_cookies; 1316 int *ncookies = v->a_ncookies; 1317 1318 int error; 1319 off_t startoff; 1320 off_t cnt = 0; 1321 struct tmpfs_node *node; 1322 1323 /* This operation only makes sense on directory nodes. */ 1324 if (vp->v_type != VDIR) 1325 return ENOTDIR; 1326 1327 node = VP_TO_TMPFS_DIR(vp); 1328 1329 startoff = uio->uio_offset; 1330 1331 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1332 error = tmpfs_dir_getdotdent(node, uio); 1333 if (error != 0) 1334 goto outok; 1335 cnt++; 1336 } 1337 1338 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1339 error = tmpfs_dir_getdotdotdent(node, uio); 1340 if (error != 0) 1341 goto outok; 1342 cnt++; 1343 } 1344 1345 error = tmpfs_dir_getdents(node, uio, &cnt); 1346 1347 outok: 1348 MPASS(error >= -1); 1349 1350 if (error == -1) 1351 error = (cnt != 0) ? 0 : EINVAL; 1352 1353 if (eofflag != NULL) 1354 *eofflag = 1355 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1356 1357 /* Update NFS-related variables. */ 1358 if (error == 0 && cookies != NULL && ncookies != NULL) { 1359 off_t i; 1360 off_t off = startoff; 1361 struct tmpfs_dirent *de = NULL; 1362 1363 *ncookies = cnt; 1364 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1365 1366 for (i = 0; i < cnt; i++) { 1367 MPASS(off != TMPFS_DIRCOOKIE_EOF); 1368 if (off == TMPFS_DIRCOOKIE_DOT) { 1369 off = TMPFS_DIRCOOKIE_DOTDOT; 1370 } else { 1371 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1372 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead); 1373 } else if (de != NULL) { 1374 de = TAILQ_NEXT(de, td_entries); 1375 } else { 1376 de = tmpfs_dir_lookupbycookie(node, 1377 off); 1378 MPASS(de != NULL); 1379 de = TAILQ_NEXT(de, td_entries); 1380 } 1381 if (de == NULL) 1382 off = TMPFS_DIRCOOKIE_EOF; 1383 else 1384 off = tmpfs_dircookie(de); 1385 } 1386 1387 (*cookies)[i] = off; 1388 } 1389 MPASS(uio->uio_offset == off); 1390 } 1391 1392 return error; 1393 } 1394 1395 /* --------------------------------------------------------------------- */ 1396 1397 static int 1398 tmpfs_readlink(struct vop_readlink_args *v) 1399 { 1400 struct vnode *vp = v->a_vp; 1401 struct uio *uio = v->a_uio; 1402 1403 int error; 1404 struct tmpfs_node *node; 1405 1406 MPASS(uio->uio_offset == 0); 1407 MPASS(vp->v_type == VLNK); 1408 1409 node = VP_TO_TMPFS_NODE(vp); 1410 1411 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1412 uio); 1413 node->tn_status |= TMPFS_NODE_ACCESSED; 1414 1415 return error; 1416 } 1417 1418 /* --------------------------------------------------------------------- */ 1419 1420 static int 1421 tmpfs_inactive(struct vop_inactive_args *v) 1422 { 1423 struct vnode *vp = v->a_vp; 1424 struct thread *l = v->a_td; 1425 1426 struct tmpfs_node *node; 1427 1428 MPASS(VOP_ISLOCKED(vp)); 1429 1430 node = VP_TO_TMPFS_NODE(vp); 1431 1432 if (node->tn_links == 0) 1433 vrecycle(vp, l); 1434 1435 return 0; 1436 } 1437 1438 /* --------------------------------------------------------------------- */ 1439 1440 int 1441 tmpfs_reclaim(struct vop_reclaim_args *v) 1442 { 1443 struct vnode *vp = v->a_vp; 1444 1445 struct tmpfs_mount *tmp; 1446 struct tmpfs_node *node; 1447 1448 node = VP_TO_TMPFS_NODE(vp); 1449 tmp = VFS_TO_TMPFS(vp->v_mount); 1450 1451 vnode_destroy_vobject(vp); 1452 cache_purge(vp); 1453 1454 TMPFS_NODE_LOCK(node); 1455 TMPFS_ASSERT_ELOCKED(node); 1456 tmpfs_free_vp(vp); 1457 1458 /* If the node referenced by this vnode was deleted by the user, 1459 * we must free its associated data structures (now that the vnode 1460 * is being reclaimed). */ 1461 if (node->tn_links == 0 && 1462 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1463 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1464 TMPFS_NODE_UNLOCK(node); 1465 tmpfs_free_node(tmp, node); 1466 } else 1467 TMPFS_NODE_UNLOCK(node); 1468 1469 MPASS(vp->v_data == NULL); 1470 return 0; 1471 } 1472 1473 /* --------------------------------------------------------------------- */ 1474 1475 static int 1476 tmpfs_print(struct vop_print_args *v) 1477 { 1478 struct vnode *vp = v->a_vp; 1479 1480 struct tmpfs_node *node; 1481 1482 node = VP_TO_TMPFS_NODE(vp); 1483 1484 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1485 node, node->tn_flags, node->tn_links); 1486 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1487 ", status 0x%x\n", 1488 node->tn_mode, node->tn_uid, node->tn_gid, 1489 (uintmax_t)node->tn_size, node->tn_status); 1490 1491 if (vp->v_type == VFIFO) 1492 fifo_printinfo(vp); 1493 1494 printf("\n"); 1495 1496 return 0; 1497 } 1498 1499 /* --------------------------------------------------------------------- */ 1500 1501 static int 1502 tmpfs_pathconf(struct vop_pathconf_args *v) 1503 { 1504 int name = v->a_name; 1505 register_t *retval = v->a_retval; 1506 1507 int error; 1508 1509 error = 0; 1510 1511 switch (name) { 1512 case _PC_LINK_MAX: 1513 *retval = LINK_MAX; 1514 break; 1515 1516 case _PC_NAME_MAX: 1517 *retval = NAME_MAX; 1518 break; 1519 1520 case _PC_PATH_MAX: 1521 *retval = PATH_MAX; 1522 break; 1523 1524 case _PC_PIPE_BUF: 1525 *retval = PIPE_BUF; 1526 break; 1527 1528 case _PC_CHOWN_RESTRICTED: 1529 *retval = 1; 1530 break; 1531 1532 case _PC_NO_TRUNC: 1533 *retval = 1; 1534 break; 1535 1536 case _PC_SYNC_IO: 1537 *retval = 1; 1538 break; 1539 1540 case _PC_FILESIZEBITS: 1541 *retval = 0; /* XXX Don't know which value should I return. */ 1542 break; 1543 1544 default: 1545 error = EINVAL; 1546 } 1547 1548 return error; 1549 } 1550 1551 static int 1552 tmpfs_vptofh(struct vop_vptofh_args *ap) 1553 { 1554 struct tmpfs_fid *tfhp; 1555 struct tmpfs_node *node; 1556 1557 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1558 node = VP_TO_TMPFS_NODE(ap->a_vp); 1559 1560 tfhp->tf_len = sizeof(struct tmpfs_fid); 1561 tfhp->tf_id = node->tn_id; 1562 tfhp->tf_gen = node->tn_gen; 1563 1564 return (0); 1565 } 1566 1567 static int 1568 tmpfs_whiteout(struct vop_whiteout_args *ap) 1569 { 1570 struct vnode *dvp = ap->a_dvp; 1571 struct componentname *cnp = ap->a_cnp; 1572 struct tmpfs_dirent *de; 1573 1574 switch (ap->a_flags) { 1575 case LOOKUP: 1576 return (0); 1577 case CREATE: 1578 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1579 if (de != NULL) 1580 return (de->td_node == NULL ? 0 : EEXIST); 1581 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1582 case DELETE: 1583 tmpfs_dir_whiteout_remove(dvp, cnp); 1584 return (0); 1585 default: 1586 panic("tmpfs_whiteout: unknown op"); 1587 } 1588 } 1589 1590 /* --------------------------------------------------------------------- */ 1591 1592 /* 1593 * vnode operations vector used for files stored in a tmpfs file system. 1594 */ 1595 struct vop_vector tmpfs_vnodeop_entries = { 1596 .vop_default = &default_vnodeops, 1597 .vop_lookup = vfs_cache_lookup, 1598 .vop_cachedlookup = tmpfs_lookup, 1599 .vop_create = tmpfs_create, 1600 .vop_mknod = tmpfs_mknod, 1601 .vop_open = tmpfs_open, 1602 .vop_close = tmpfs_close, 1603 .vop_access = tmpfs_access, 1604 .vop_getattr = tmpfs_getattr, 1605 .vop_setattr = tmpfs_setattr, 1606 .vop_read = tmpfs_read, 1607 .vop_write = tmpfs_write, 1608 .vop_fsync = tmpfs_fsync, 1609 .vop_remove = tmpfs_remove, 1610 .vop_link = tmpfs_link, 1611 .vop_rename = tmpfs_rename, 1612 .vop_mkdir = tmpfs_mkdir, 1613 .vop_rmdir = tmpfs_rmdir, 1614 .vop_symlink = tmpfs_symlink, 1615 .vop_readdir = tmpfs_readdir, 1616 .vop_readlink = tmpfs_readlink, 1617 .vop_inactive = tmpfs_inactive, 1618 .vop_reclaim = tmpfs_reclaim, 1619 .vop_print = tmpfs_print, 1620 .vop_pathconf = tmpfs_pathconf, 1621 .vop_vptofh = tmpfs_vptofh, 1622 .vop_whiteout = tmpfs_whiteout, 1623 .vop_bmap = VOP_EOPNOTSUPP, 1624 }; 1625 1626