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 MPASS(VOP_ISLOCKED(vp)); 274 275 /* Update node times. */ 276 tmpfs_update(vp); 277 278 return (0); 279 } 280 281 /* --------------------------------------------------------------------- */ 282 283 int 284 tmpfs_access(struct vop_access_args *v) 285 { 286 struct vnode *vp = v->a_vp; 287 accmode_t accmode = v->a_accmode; 288 struct ucred *cred = v->a_cred; 289 290 int error; 291 struct tmpfs_node *node; 292 293 MPASS(VOP_ISLOCKED(vp)); 294 295 node = VP_TO_TMPFS_NODE(vp); 296 297 switch (vp->v_type) { 298 case VDIR: 299 /* FALLTHROUGH */ 300 case VLNK: 301 /* FALLTHROUGH */ 302 case VREG: 303 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 304 error = EROFS; 305 goto out; 306 } 307 break; 308 309 case VBLK: 310 /* FALLTHROUGH */ 311 case VCHR: 312 /* FALLTHROUGH */ 313 case VSOCK: 314 /* FALLTHROUGH */ 315 case VFIFO: 316 break; 317 318 default: 319 error = EINVAL; 320 goto out; 321 } 322 323 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 324 error = EPERM; 325 goto out; 326 } 327 328 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 329 node->tn_gid, accmode, cred, NULL); 330 331 out: 332 MPASS(VOP_ISLOCKED(vp)); 333 334 return error; 335 } 336 337 /* --------------------------------------------------------------------- */ 338 339 int 340 tmpfs_getattr(struct vop_getattr_args *v) 341 { 342 struct vnode *vp = v->a_vp; 343 struct vattr *vap = v->a_vap; 344 345 struct tmpfs_node *node; 346 347 node = VP_TO_TMPFS_NODE(vp); 348 349 tmpfs_update(vp); 350 351 vap->va_type = vp->v_type; 352 vap->va_mode = node->tn_mode; 353 vap->va_nlink = node->tn_links; 354 vap->va_uid = node->tn_uid; 355 vap->va_gid = node->tn_gid; 356 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 357 vap->va_fileid = node->tn_id; 358 vap->va_size = node->tn_size; 359 vap->va_blocksize = PAGE_SIZE; 360 vap->va_atime = node->tn_atime; 361 vap->va_mtime = node->tn_mtime; 362 vap->va_ctime = node->tn_ctime; 363 vap->va_birthtime = node->tn_birthtime; 364 vap->va_gen = node->tn_gen; 365 vap->va_flags = node->tn_flags; 366 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 367 node->tn_rdev : NODEV; 368 vap->va_bytes = round_page(node->tn_size); 369 vap->va_filerev = 0; 370 371 return 0; 372 } 373 374 /* --------------------------------------------------------------------- */ 375 376 /* XXX Should this operation be atomic? I think it should, but code in 377 * XXX other places (e.g., ufs) doesn't seem to be... */ 378 int 379 tmpfs_setattr(struct vop_setattr_args *v) 380 { 381 struct vnode *vp = v->a_vp; 382 struct vattr *vap = v->a_vap; 383 struct ucred *cred = v->a_cred; 384 struct thread *td = curthread; 385 386 int error; 387 388 MPASS(VOP_ISLOCKED(vp)); 389 390 error = 0; 391 392 /* Abort if any unsettable attribute is given. */ 393 if (vap->va_type != VNON || 394 vap->va_nlink != VNOVAL || 395 vap->va_fsid != VNOVAL || 396 vap->va_fileid != VNOVAL || 397 vap->va_blocksize != VNOVAL || 398 vap->va_gen != VNOVAL || 399 vap->va_rdev != VNOVAL || 400 vap->va_bytes != VNOVAL) 401 error = EINVAL; 402 403 if (error == 0 && (vap->va_flags != VNOVAL)) 404 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 405 406 if (error == 0 && (vap->va_size != VNOVAL)) 407 error = tmpfs_chsize(vp, vap->va_size, cred, td); 408 409 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 410 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 411 412 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 413 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 414 415 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 416 vap->va_atime.tv_nsec != VNOVAL) || 417 (vap->va_mtime.tv_sec != VNOVAL && 418 vap->va_mtime.tv_nsec != VNOVAL) || 419 (vap->va_birthtime.tv_sec != VNOVAL && 420 vap->va_birthtime.tv_nsec != VNOVAL))) 421 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 422 &vap->va_birthtime, vap->va_vaflags, cred, td); 423 424 /* Update the node times. We give preference to the error codes 425 * generated by this function rather than the ones that may arise 426 * from tmpfs_update. */ 427 tmpfs_update(vp); 428 429 MPASS(VOP_ISLOCKED(vp)); 430 431 return error; 432 } 433 434 /* --------------------------------------------------------------------- */ 435 static int 436 tmpfs_nocacheread(vm_object_t tobj, vm_pindex_t idx, 437 vm_offset_t offset, size_t tlen, struct uio *uio) 438 { 439 vm_page_t m; 440 int error; 441 442 VM_OBJECT_LOCK(tobj); 443 vm_object_pip_add(tobj, 1); 444 m = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 445 VM_ALLOC_ZERO | VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 446 if (m->valid != VM_PAGE_BITS_ALL) { 447 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 448 error = vm_pager_get_pages(tobj, &m, 1, 0); 449 if (error != 0) { 450 printf("tmpfs get pages from pager error [read]\n"); 451 goto out; 452 } 453 } else 454 vm_page_zero_invalid(m, TRUE); 455 } 456 VM_OBJECT_UNLOCK(tobj); 457 error = uiomove_fromphys(&m, offset, tlen, uio); 458 VM_OBJECT_LOCK(tobj); 459 out: 460 vm_page_lock(m); 461 vm_page_unwire(m, TRUE); 462 vm_page_unlock(m); 463 vm_page_wakeup(m); 464 vm_object_pip_subtract(tobj, 1); 465 VM_OBJECT_UNLOCK(tobj); 466 467 return (error); 468 } 469 470 static __inline int 471 tmpfs_nocacheread_buf(vm_object_t tobj, vm_pindex_t idx, 472 vm_offset_t offset, size_t tlen, void *buf) 473 { 474 struct uio uio; 475 struct iovec iov; 476 477 uio.uio_iovcnt = 1; 478 uio.uio_iov = &iov; 479 iov.iov_base = buf; 480 iov.iov_len = tlen; 481 482 uio.uio_offset = 0; 483 uio.uio_resid = tlen; 484 uio.uio_rw = UIO_READ; 485 uio.uio_segflg = UIO_SYSSPACE; 486 uio.uio_td = curthread; 487 488 return (tmpfs_nocacheread(tobj, idx, offset, tlen, &uio)); 489 } 490 491 static int 492 tmpfs_mappedread(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 493 { 494 struct sf_buf *sf; 495 vm_pindex_t idx; 496 vm_page_t m; 497 vm_offset_t offset; 498 off_t addr; 499 size_t tlen; 500 char *ma; 501 int error; 502 503 addr = uio->uio_offset; 504 idx = OFF_TO_IDX(addr); 505 offset = addr & PAGE_MASK; 506 tlen = MIN(PAGE_SIZE - offset, len); 507 508 if ((vobj == NULL) || 509 (vobj->resident_page_count == 0 && vobj->cache == NULL)) 510 goto nocache; 511 512 VM_OBJECT_LOCK(vobj); 513 lookupvpg: 514 if (((m = vm_page_lookup(vobj, idx)) != NULL) && 515 vm_page_is_valid(m, offset, tlen)) { 516 if ((m->oflags & VPO_BUSY) != 0) { 517 /* 518 * Reference the page before unlocking and sleeping so 519 * that the page daemon is less likely to reclaim it. 520 */ 521 vm_page_lock_queues(); 522 vm_page_flag_set(m, PG_REFERENCED); 523 vm_page_sleep(m, "tmfsmr"); 524 goto lookupvpg; 525 } 526 vm_page_busy(m); 527 VM_OBJECT_UNLOCK(vobj); 528 error = uiomove_fromphys(&m, offset, tlen, uio); 529 VM_OBJECT_LOCK(vobj); 530 vm_page_wakeup(m); 531 VM_OBJECT_UNLOCK(vobj); 532 return (error); 533 } else if (m != NULL && uio->uio_segflg == UIO_NOCOPY) { 534 KASSERT(offset == 0, 535 ("unexpected offset in tmpfs_mappedread for sendfile")); 536 if ((m->oflags & VPO_BUSY) != 0) { 537 /* 538 * Reference the page before unlocking and sleeping so 539 * that the page daemon is less likely to reclaim it. 540 */ 541 vm_page_lock_queues(); 542 vm_page_flag_set(m, PG_REFERENCED); 543 vm_page_sleep(m, "tmfsmr"); 544 goto lookupvpg; 545 } 546 vm_page_busy(m); 547 VM_OBJECT_UNLOCK(vobj); 548 sched_pin(); 549 sf = sf_buf_alloc(m, SFB_CPUPRIVATE); 550 ma = (char *)sf_buf_kva(sf); 551 error = tmpfs_nocacheread_buf(tobj, idx, 0, tlen, ma); 552 if (error == 0) { 553 if (tlen != PAGE_SIZE) 554 bzero(ma + tlen, PAGE_SIZE - tlen); 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 if (error == 0) 562 m->valid = VM_PAGE_BITS_ALL; 563 vm_page_wakeup(m); 564 VM_OBJECT_UNLOCK(vobj); 565 return (error); 566 } 567 VM_OBJECT_UNLOCK(vobj); 568 nocache: 569 error = tmpfs_nocacheread(tobj, idx, offset, tlen, uio); 570 571 return (error); 572 } 573 574 static int 575 tmpfs_read(struct vop_read_args *v) 576 { 577 struct vnode *vp = v->a_vp; 578 struct uio *uio = v->a_uio; 579 580 struct tmpfs_node *node; 581 vm_object_t uobj; 582 size_t len; 583 int resid; 584 585 int error = 0; 586 587 node = VP_TO_TMPFS_NODE(vp); 588 589 if (vp->v_type != VREG) { 590 error = EISDIR; 591 goto out; 592 } 593 594 if (uio->uio_offset < 0) { 595 error = EINVAL; 596 goto out; 597 } 598 599 node->tn_status |= TMPFS_NODE_ACCESSED; 600 601 uobj = node->tn_reg.tn_aobj; 602 while ((resid = uio->uio_resid) > 0) { 603 error = 0; 604 if (node->tn_size <= uio->uio_offset) 605 break; 606 len = MIN(node->tn_size - uio->uio_offset, resid); 607 if (len == 0) 608 break; 609 error = tmpfs_mappedread(vp->v_object, uobj, len, uio); 610 if ((error != 0) || (resid == uio->uio_resid)) 611 break; 612 } 613 614 out: 615 616 return error; 617 } 618 619 /* --------------------------------------------------------------------- */ 620 621 static int 622 tmpfs_mappedwrite(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 623 { 624 vm_pindex_t idx; 625 vm_page_t vpg, tpg; 626 vm_offset_t offset; 627 off_t addr; 628 size_t tlen; 629 int error; 630 631 error = 0; 632 633 addr = uio->uio_offset; 634 idx = OFF_TO_IDX(addr); 635 offset = addr & PAGE_MASK; 636 tlen = MIN(PAGE_SIZE - offset, len); 637 638 if ((vobj == NULL) || 639 (vobj->resident_page_count == 0 && vobj->cache == NULL)) { 640 vpg = NULL; 641 goto nocache; 642 } 643 644 VM_OBJECT_LOCK(vobj); 645 lookupvpg: 646 if (((vpg = vm_page_lookup(vobj, idx)) != NULL) && 647 vm_page_is_valid(vpg, offset, tlen)) { 648 if ((vpg->oflags & VPO_BUSY) != 0) { 649 /* 650 * Reference the page before unlocking and sleeping so 651 * that the page daemon is less likely to reclaim it. 652 */ 653 vm_page_lock_queues(); 654 vm_page_flag_set(vpg, PG_REFERENCED); 655 vm_page_sleep(vpg, "tmfsmw"); 656 goto lookupvpg; 657 } 658 vm_page_busy(vpg); 659 vm_page_undirty(vpg); 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 if (error == 0) { 695 KASSERT(tpg->valid == VM_PAGE_BITS_ALL, 696 ("parts of tpg invalid")); 697 vm_page_dirty(tpg); 698 } 699 vm_page_lock(tpg); 700 vm_page_unwire(tpg, TRUE); 701 vm_page_unlock(tpg); 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; 719 720 boolean_t extended; 721 int error = 0; 722 off_t oldsize; 723 struct tmpfs_node *node; 724 vm_object_t uobj; 725 size_t len; 726 int resid; 727 728 node = VP_TO_TMPFS_NODE(vp); 729 oldsize = node->tn_size; 730 731 if (uio->uio_offset < 0 || vp->v_type != VREG) { 732 error = EINVAL; 733 goto out; 734 } 735 736 if (uio->uio_resid == 0) { 737 error = 0; 738 goto out; 739 } 740 741 if (ioflag & IO_APPEND) 742 uio->uio_offset = node->tn_size; 743 744 if (uio->uio_offset + uio->uio_resid > 745 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 746 return (EFBIG); 747 748 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 749 return (EFBIG); 750 751 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 752 if (extended) { 753 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 754 if (error != 0) 755 goto out; 756 } 757 758 uobj = node->tn_reg.tn_aobj; 759 while ((resid = uio->uio_resid) > 0) { 760 if (node->tn_size <= uio->uio_offset) 761 break; 762 len = MIN(node->tn_size - uio->uio_offset, resid); 763 if (len == 0) 764 break; 765 error = tmpfs_mappedwrite(vp->v_object, uobj, len, uio); 766 if ((error != 0) || (resid == uio->uio_resid)) 767 break; 768 } 769 770 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 771 (extended ? TMPFS_NODE_CHANGED : 0); 772 773 if (node->tn_mode & (S_ISUID | S_ISGID)) { 774 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 775 node->tn_mode &= ~(S_ISUID | S_ISGID); 776 } 777 778 if (error != 0) 779 (void)tmpfs_reg_resize(vp, oldsize); 780 781 out: 782 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 783 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 784 785 return error; 786 } 787 788 /* --------------------------------------------------------------------- */ 789 790 static int 791 tmpfs_fsync(struct vop_fsync_args *v) 792 { 793 struct vnode *vp = v->a_vp; 794 795 MPASS(VOP_ISLOCKED(vp)); 796 797 tmpfs_update(vp); 798 799 return 0; 800 } 801 802 /* --------------------------------------------------------------------- */ 803 804 static int 805 tmpfs_remove(struct vop_remove_args *v) 806 { 807 struct vnode *dvp = v->a_dvp; 808 struct vnode *vp = v->a_vp; 809 810 int error; 811 struct tmpfs_dirent *de; 812 struct tmpfs_mount *tmp; 813 struct tmpfs_node *dnode; 814 struct tmpfs_node *node; 815 816 MPASS(VOP_ISLOCKED(dvp)); 817 MPASS(VOP_ISLOCKED(vp)); 818 819 if (vp->v_type == VDIR) { 820 error = EISDIR; 821 goto out; 822 } 823 824 dnode = VP_TO_TMPFS_DIR(dvp); 825 node = VP_TO_TMPFS_NODE(vp); 826 tmp = VFS_TO_TMPFS(vp->v_mount); 827 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 828 MPASS(de != NULL); 829 830 /* Files marked as immutable or append-only cannot be deleted. */ 831 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 832 (dnode->tn_flags & APPEND)) { 833 error = EPERM; 834 goto out; 835 } 836 837 /* Remove the entry from the directory; as it is a file, we do not 838 * have to change the number of hard links of the directory. */ 839 tmpfs_dir_detach(dvp, de); 840 if (v->a_cnp->cn_flags & DOWHITEOUT) 841 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 842 843 /* Free the directory entry we just deleted. Note that the node 844 * referred by it will not be removed until the vnode is really 845 * reclaimed. */ 846 tmpfs_free_dirent(tmp, de, TRUE); 847 848 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 849 error = 0; 850 851 out: 852 853 return error; 854 } 855 856 /* --------------------------------------------------------------------- */ 857 858 static int 859 tmpfs_link(struct vop_link_args *v) 860 { 861 struct vnode *dvp = v->a_tdvp; 862 struct vnode *vp = v->a_vp; 863 struct componentname *cnp = v->a_cnp; 864 865 int error; 866 struct tmpfs_dirent *de; 867 struct tmpfs_node *node; 868 869 MPASS(VOP_ISLOCKED(dvp)); 870 MPASS(cnp->cn_flags & HASBUF); 871 MPASS(dvp != vp); /* XXX When can this be false? */ 872 873 node = VP_TO_TMPFS_NODE(vp); 874 875 /* XXX: Why aren't the following two tests done by the caller? */ 876 877 /* Hard links of directories are forbidden. */ 878 if (vp->v_type == VDIR) { 879 error = EPERM; 880 goto out; 881 } 882 883 /* Cannot create cross-device links. */ 884 if (dvp->v_mount != vp->v_mount) { 885 error = EXDEV; 886 goto out; 887 } 888 889 /* Ensure that we do not overflow the maximum number of links imposed 890 * by the system. */ 891 MPASS(node->tn_links <= LINK_MAX); 892 if (node->tn_links == LINK_MAX) { 893 error = EMLINK; 894 goto out; 895 } 896 897 /* We cannot create links of files marked immutable or append-only. */ 898 if (node->tn_flags & (IMMUTABLE | APPEND)) { 899 error = EPERM; 900 goto out; 901 } 902 903 /* Allocate a new directory entry to represent the node. */ 904 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 905 cnp->cn_nameptr, cnp->cn_namelen, &de); 906 if (error != 0) 907 goto out; 908 909 /* Insert the new directory entry into the appropriate directory. */ 910 if (cnp->cn_flags & ISWHITEOUT) 911 tmpfs_dir_whiteout_remove(dvp, cnp); 912 tmpfs_dir_attach(dvp, de); 913 914 /* vp link count has changed, so update node times. */ 915 node->tn_status |= TMPFS_NODE_CHANGED; 916 tmpfs_update(vp); 917 918 error = 0; 919 920 out: 921 return error; 922 } 923 924 /* --------------------------------------------------------------------- */ 925 926 static int 927 tmpfs_rename(struct vop_rename_args *v) 928 { 929 struct vnode *fdvp = v->a_fdvp; 930 struct vnode *fvp = v->a_fvp; 931 struct componentname *fcnp = v->a_fcnp; 932 struct vnode *tdvp = v->a_tdvp; 933 struct vnode *tvp = v->a_tvp; 934 struct componentname *tcnp = v->a_tcnp; 935 936 char *newname; 937 int error; 938 struct tmpfs_dirent *de; 939 struct tmpfs_mount *tmp; 940 struct tmpfs_node *fdnode; 941 struct tmpfs_node *fnode; 942 struct tmpfs_node *tnode; 943 struct tmpfs_node *tdnode; 944 945 MPASS(VOP_ISLOCKED(tdvp)); 946 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 947 MPASS(fcnp->cn_flags & HASBUF); 948 MPASS(tcnp->cn_flags & HASBUF); 949 950 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 951 952 /* Disallow cross-device renames. 953 * XXX Why isn't this done by the caller? */ 954 if (fvp->v_mount != tdvp->v_mount || 955 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 956 error = EXDEV; 957 goto out; 958 } 959 960 tmp = VFS_TO_TMPFS(tdvp->v_mount); 961 tdnode = VP_TO_TMPFS_DIR(tdvp); 962 963 /* If source and target are the same file, there is nothing to do. */ 964 if (fvp == tvp) { 965 error = 0; 966 goto out; 967 } 968 969 /* If we need to move the directory between entries, lock the 970 * source so that we can safely operate on it. */ 971 if (tdvp != fdvp) { 972 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 973 if (error != 0) 974 goto out; 975 } 976 fdnode = VP_TO_TMPFS_DIR(fdvp); 977 fnode = VP_TO_TMPFS_NODE(fvp); 978 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 979 980 /* Entry can disappear before we lock fdvp, 981 * also avoid manipulating '.' and '..' entries. */ 982 if (de == NULL) { 983 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 984 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 985 error = EINVAL; 986 else 987 error = ENOENT; 988 goto out_locked; 989 } 990 MPASS(de->td_node == fnode); 991 992 /* If re-naming a directory to another preexisting directory 993 * ensure that the target directory is empty so that its 994 * removal causes no side effects. 995 * Kern_rename gurantees the destination to be a directory 996 * if the source is one. */ 997 if (tvp != NULL) { 998 MPASS(tnode != NULL); 999 1000 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 1001 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 1002 error = EPERM; 1003 goto out_locked; 1004 } 1005 1006 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 1007 if (tnode->tn_size > 0) { 1008 error = ENOTEMPTY; 1009 goto out_locked; 1010 } 1011 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 1012 error = ENOTDIR; 1013 goto out_locked; 1014 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 1015 error = EISDIR; 1016 goto out_locked; 1017 } else { 1018 MPASS(fnode->tn_type != VDIR && 1019 tnode->tn_type != VDIR); 1020 } 1021 } 1022 1023 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 1024 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 1025 error = EPERM; 1026 goto out_locked; 1027 } 1028 1029 /* Ensure that we have enough memory to hold the new name, if it 1030 * has to be changed. */ 1031 if (fcnp->cn_namelen != tcnp->cn_namelen || 1032 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 1033 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 1034 } else 1035 newname = NULL; 1036 1037 /* If the node is being moved to another directory, we have to do 1038 * the move. */ 1039 if (fdnode != tdnode) { 1040 /* In case we are moving a directory, we have to adjust its 1041 * parent to point to the new parent. */ 1042 if (de->td_node->tn_type == VDIR) { 1043 struct tmpfs_node *n; 1044 1045 /* Ensure the target directory is not a child of the 1046 * directory being moved. Otherwise, we'd end up 1047 * with stale nodes. */ 1048 n = tdnode; 1049 /* TMPFS_LOCK garanties that no nodes are freed while 1050 * traversing the list. Nodes can only be marked as 1051 * removed: tn_parent == NULL. */ 1052 TMPFS_LOCK(tmp); 1053 TMPFS_NODE_LOCK(n); 1054 while (n != n->tn_dir.tn_parent) { 1055 struct tmpfs_node *parent; 1056 1057 if (n == fnode) { 1058 TMPFS_NODE_UNLOCK(n); 1059 TMPFS_UNLOCK(tmp); 1060 error = EINVAL; 1061 if (newname != NULL) 1062 free(newname, M_TMPFSNAME); 1063 goto out_locked; 1064 } 1065 parent = n->tn_dir.tn_parent; 1066 TMPFS_NODE_UNLOCK(n); 1067 if (parent == NULL) { 1068 n = NULL; 1069 break; 1070 } 1071 TMPFS_NODE_LOCK(parent); 1072 if (parent->tn_dir.tn_parent == NULL) { 1073 TMPFS_NODE_UNLOCK(parent); 1074 n = NULL; 1075 break; 1076 } 1077 n = parent; 1078 } 1079 TMPFS_UNLOCK(tmp); 1080 if (n == NULL) { 1081 error = EINVAL; 1082 if (newname != NULL) 1083 free(newname, M_TMPFSNAME); 1084 goto out_locked; 1085 } 1086 TMPFS_NODE_UNLOCK(n); 1087 1088 /* Adjust the parent pointer. */ 1089 TMPFS_VALIDATE_DIR(fnode); 1090 TMPFS_NODE_LOCK(de->td_node); 1091 de->td_node->tn_dir.tn_parent = tdnode; 1092 TMPFS_NODE_UNLOCK(de->td_node); 1093 1094 /* As a result of changing the target of the '..' 1095 * entry, the link count of the source and target 1096 * directories has to be adjusted. */ 1097 TMPFS_NODE_LOCK(tdnode); 1098 TMPFS_ASSERT_LOCKED(tdnode); 1099 tdnode->tn_links++; 1100 TMPFS_NODE_UNLOCK(tdnode); 1101 1102 TMPFS_NODE_LOCK(fdnode); 1103 TMPFS_ASSERT_LOCKED(fdnode); 1104 fdnode->tn_links--; 1105 TMPFS_NODE_UNLOCK(fdnode); 1106 } 1107 1108 /* Do the move: just remove the entry from the source directory 1109 * and insert it into the target one. */ 1110 tmpfs_dir_detach(fdvp, de); 1111 if (fcnp->cn_flags & DOWHITEOUT) 1112 tmpfs_dir_whiteout_add(fdvp, fcnp); 1113 if (tcnp->cn_flags & ISWHITEOUT) 1114 tmpfs_dir_whiteout_remove(tdvp, tcnp); 1115 tmpfs_dir_attach(tdvp, de); 1116 } 1117 1118 /* If the name has changed, we need to make it effective by changing 1119 * it in the directory entry. */ 1120 if (newname != NULL) { 1121 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1122 1123 free(de->td_name, M_TMPFSNAME); 1124 de->td_namelen = (uint16_t)tcnp->cn_namelen; 1125 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 1126 de->td_name = newname; 1127 1128 fnode->tn_status |= TMPFS_NODE_CHANGED; 1129 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1130 } 1131 1132 /* If we are overwriting an entry, we have to remove the old one 1133 * from the target directory. */ 1134 if (tvp != NULL) { 1135 /* Remove the old entry from the target directory. */ 1136 de = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1137 tmpfs_dir_detach(tdvp, de); 1138 1139 /* Free the directory entry we just deleted. Note that the 1140 * node referred by it will not be removed until the vnode is 1141 * really reclaimed. */ 1142 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 1143 } 1144 1145 error = 0; 1146 1147 out_locked: 1148 if (fdnode != tdnode) 1149 VOP_UNLOCK(fdvp, 0); 1150 1151 out: 1152 /* Release target nodes. */ 1153 /* XXX: I don't understand when tdvp can be the same as tvp, but 1154 * other code takes care of this... */ 1155 if (tdvp == tvp) 1156 vrele(tdvp); 1157 else 1158 vput(tdvp); 1159 if (tvp != NULL) 1160 vput(tvp); 1161 1162 /* Release source nodes. */ 1163 vrele(fdvp); 1164 vrele(fvp); 1165 1166 return error; 1167 } 1168 1169 /* --------------------------------------------------------------------- */ 1170 1171 static int 1172 tmpfs_mkdir(struct vop_mkdir_args *v) 1173 { 1174 struct vnode *dvp = v->a_dvp; 1175 struct vnode **vpp = v->a_vpp; 1176 struct componentname *cnp = v->a_cnp; 1177 struct vattr *vap = v->a_vap; 1178 1179 MPASS(vap->va_type == VDIR); 1180 1181 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1182 } 1183 1184 /* --------------------------------------------------------------------- */ 1185 1186 static int 1187 tmpfs_rmdir(struct vop_rmdir_args *v) 1188 { 1189 struct vnode *dvp = v->a_dvp; 1190 struct vnode *vp = v->a_vp; 1191 1192 int error; 1193 struct tmpfs_dirent *de; 1194 struct tmpfs_mount *tmp; 1195 struct tmpfs_node *dnode; 1196 struct tmpfs_node *node; 1197 1198 MPASS(VOP_ISLOCKED(dvp)); 1199 MPASS(VOP_ISLOCKED(vp)); 1200 1201 tmp = VFS_TO_TMPFS(dvp->v_mount); 1202 dnode = VP_TO_TMPFS_DIR(dvp); 1203 node = VP_TO_TMPFS_DIR(vp); 1204 1205 /* Directories with more than two entries ('.' and '..') cannot be 1206 * removed. */ 1207 if (node->tn_size > 0) { 1208 error = ENOTEMPTY; 1209 goto out; 1210 } 1211 1212 if ((dnode->tn_flags & APPEND) 1213 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1214 error = EPERM; 1215 goto out; 1216 } 1217 1218 /* This invariant holds only if we are not trying to remove "..". 1219 * We checked for that above so this is safe now. */ 1220 MPASS(node->tn_dir.tn_parent == dnode); 1221 1222 /* Get the directory entry associated with node (vp). This was 1223 * filled by tmpfs_lookup while looking up the entry. */ 1224 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1225 MPASS(TMPFS_DIRENT_MATCHES(de, 1226 v->a_cnp->cn_nameptr, 1227 v->a_cnp->cn_namelen)); 1228 1229 /* Check flags to see if we are allowed to remove the directory. */ 1230 if (dnode->tn_flags & APPEND 1231 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1232 error = EPERM; 1233 goto out; 1234 } 1235 1236 1237 /* Detach the directory entry from the directory (dnode). */ 1238 tmpfs_dir_detach(dvp, de); 1239 if (v->a_cnp->cn_flags & DOWHITEOUT) 1240 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1241 1242 /* No vnode should be allocated for this entry from this point */ 1243 TMPFS_NODE_LOCK(node); 1244 TMPFS_ASSERT_ELOCKED(node); 1245 node->tn_links--; 1246 node->tn_dir.tn_parent = NULL; 1247 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1248 TMPFS_NODE_MODIFIED; 1249 1250 TMPFS_NODE_UNLOCK(node); 1251 1252 TMPFS_NODE_LOCK(dnode); 1253 TMPFS_ASSERT_ELOCKED(dnode); 1254 dnode->tn_links--; 1255 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1256 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1257 TMPFS_NODE_UNLOCK(dnode); 1258 1259 cache_purge(dvp); 1260 cache_purge(vp); 1261 1262 /* Free the directory entry we just deleted. Note that the node 1263 * referred by it will not be removed until the vnode is really 1264 * reclaimed. */ 1265 tmpfs_free_dirent(tmp, de, TRUE); 1266 1267 /* Release the deleted vnode (will destroy the node, notify 1268 * interested parties and clean it from the cache). */ 1269 1270 dnode->tn_status |= TMPFS_NODE_CHANGED; 1271 tmpfs_update(dvp); 1272 1273 error = 0; 1274 1275 out: 1276 return error; 1277 } 1278 1279 /* --------------------------------------------------------------------- */ 1280 1281 static int 1282 tmpfs_symlink(struct vop_symlink_args *v) 1283 { 1284 struct vnode *dvp = v->a_dvp; 1285 struct vnode **vpp = v->a_vpp; 1286 struct componentname *cnp = v->a_cnp; 1287 struct vattr *vap = v->a_vap; 1288 char *target = v->a_target; 1289 1290 #ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1291 MPASS(vap->va_type == VLNK); 1292 #else 1293 vap->va_type = VLNK; 1294 #endif 1295 1296 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1297 } 1298 1299 /* --------------------------------------------------------------------- */ 1300 1301 static int 1302 tmpfs_readdir(struct vop_readdir_args *v) 1303 { 1304 struct vnode *vp = v->a_vp; 1305 struct uio *uio = v->a_uio; 1306 int *eofflag = v->a_eofflag; 1307 u_long **cookies = v->a_cookies; 1308 int *ncookies = v->a_ncookies; 1309 1310 int error; 1311 off_t startoff; 1312 off_t cnt = 0; 1313 struct tmpfs_node *node; 1314 1315 /* This operation only makes sense on directory nodes. */ 1316 if (vp->v_type != VDIR) 1317 return ENOTDIR; 1318 1319 node = VP_TO_TMPFS_DIR(vp); 1320 1321 startoff = uio->uio_offset; 1322 1323 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1324 error = tmpfs_dir_getdotdent(node, uio); 1325 if (error != 0) 1326 goto outok; 1327 cnt++; 1328 } 1329 1330 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1331 error = tmpfs_dir_getdotdotdent(node, uio); 1332 if (error != 0) 1333 goto outok; 1334 cnt++; 1335 } 1336 1337 error = tmpfs_dir_getdents(node, uio, &cnt); 1338 1339 outok: 1340 MPASS(error >= -1); 1341 1342 if (error == -1) 1343 error = (cnt != 0) ? 0 : EINVAL; 1344 1345 if (eofflag != NULL) 1346 *eofflag = 1347 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1348 1349 /* Update NFS-related variables. */ 1350 if (error == 0 && cookies != NULL && ncookies != NULL) { 1351 off_t i; 1352 off_t off = startoff; 1353 struct tmpfs_dirent *de = NULL; 1354 1355 *ncookies = cnt; 1356 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1357 1358 for (i = 0; i < cnt; i++) { 1359 MPASS(off != TMPFS_DIRCOOKIE_EOF); 1360 if (off == TMPFS_DIRCOOKIE_DOT) { 1361 off = TMPFS_DIRCOOKIE_DOTDOT; 1362 } else { 1363 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1364 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead); 1365 } else if (de != NULL) { 1366 de = TAILQ_NEXT(de, td_entries); 1367 } else { 1368 de = tmpfs_dir_lookupbycookie(node, 1369 off); 1370 MPASS(de != NULL); 1371 de = TAILQ_NEXT(de, td_entries); 1372 } 1373 if (de == NULL) 1374 off = TMPFS_DIRCOOKIE_EOF; 1375 else 1376 off = tmpfs_dircookie(de); 1377 } 1378 1379 (*cookies)[i] = off; 1380 } 1381 MPASS(uio->uio_offset == off); 1382 } 1383 1384 return error; 1385 } 1386 1387 /* --------------------------------------------------------------------- */ 1388 1389 static int 1390 tmpfs_readlink(struct vop_readlink_args *v) 1391 { 1392 struct vnode *vp = v->a_vp; 1393 struct uio *uio = v->a_uio; 1394 1395 int error; 1396 struct tmpfs_node *node; 1397 1398 MPASS(uio->uio_offset == 0); 1399 MPASS(vp->v_type == VLNK); 1400 1401 node = VP_TO_TMPFS_NODE(vp); 1402 1403 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1404 uio); 1405 node->tn_status |= TMPFS_NODE_ACCESSED; 1406 1407 return error; 1408 } 1409 1410 /* --------------------------------------------------------------------- */ 1411 1412 static int 1413 tmpfs_inactive(struct vop_inactive_args *v) 1414 { 1415 struct vnode *vp = v->a_vp; 1416 struct thread *l = v->a_td; 1417 1418 struct tmpfs_node *node; 1419 1420 MPASS(VOP_ISLOCKED(vp)); 1421 1422 node = VP_TO_TMPFS_NODE(vp); 1423 1424 if (node->tn_links == 0) 1425 vrecycle(vp, l); 1426 1427 return 0; 1428 } 1429 1430 /* --------------------------------------------------------------------- */ 1431 1432 int 1433 tmpfs_reclaim(struct vop_reclaim_args *v) 1434 { 1435 struct vnode *vp = v->a_vp; 1436 1437 struct tmpfs_mount *tmp; 1438 struct tmpfs_node *node; 1439 1440 node = VP_TO_TMPFS_NODE(vp); 1441 tmp = VFS_TO_TMPFS(vp->v_mount); 1442 1443 vnode_destroy_vobject(vp); 1444 cache_purge(vp); 1445 1446 TMPFS_NODE_LOCK(node); 1447 TMPFS_ASSERT_ELOCKED(node); 1448 tmpfs_free_vp(vp); 1449 1450 /* If the node referenced by this vnode was deleted by the user, 1451 * we must free its associated data structures (now that the vnode 1452 * is being reclaimed). */ 1453 if (node->tn_links == 0 && 1454 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1455 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1456 TMPFS_NODE_UNLOCK(node); 1457 tmpfs_free_node(tmp, node); 1458 } else 1459 TMPFS_NODE_UNLOCK(node); 1460 1461 MPASS(vp->v_data == NULL); 1462 return 0; 1463 } 1464 1465 /* --------------------------------------------------------------------- */ 1466 1467 static int 1468 tmpfs_print(struct vop_print_args *v) 1469 { 1470 struct vnode *vp = v->a_vp; 1471 1472 struct tmpfs_node *node; 1473 1474 node = VP_TO_TMPFS_NODE(vp); 1475 1476 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1477 node, node->tn_flags, node->tn_links); 1478 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1479 ", status 0x%x\n", 1480 node->tn_mode, node->tn_uid, node->tn_gid, 1481 (uintmax_t)node->tn_size, node->tn_status); 1482 1483 if (vp->v_type == VFIFO) 1484 fifo_printinfo(vp); 1485 1486 printf("\n"); 1487 1488 return 0; 1489 } 1490 1491 /* --------------------------------------------------------------------- */ 1492 1493 static int 1494 tmpfs_pathconf(struct vop_pathconf_args *v) 1495 { 1496 int name = v->a_name; 1497 register_t *retval = v->a_retval; 1498 1499 int error; 1500 1501 error = 0; 1502 1503 switch (name) { 1504 case _PC_LINK_MAX: 1505 *retval = LINK_MAX; 1506 break; 1507 1508 case _PC_NAME_MAX: 1509 *retval = NAME_MAX; 1510 break; 1511 1512 case _PC_PATH_MAX: 1513 *retval = PATH_MAX; 1514 break; 1515 1516 case _PC_PIPE_BUF: 1517 *retval = PIPE_BUF; 1518 break; 1519 1520 case _PC_CHOWN_RESTRICTED: 1521 *retval = 1; 1522 break; 1523 1524 case _PC_NO_TRUNC: 1525 *retval = 1; 1526 break; 1527 1528 case _PC_SYNC_IO: 1529 *retval = 1; 1530 break; 1531 1532 case _PC_FILESIZEBITS: 1533 *retval = 0; /* XXX Don't know which value should I return. */ 1534 break; 1535 1536 default: 1537 error = EINVAL; 1538 } 1539 1540 return error; 1541 } 1542 1543 static int 1544 tmpfs_vptofh(struct vop_vptofh_args *ap) 1545 { 1546 struct tmpfs_fid *tfhp; 1547 struct tmpfs_node *node; 1548 1549 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1550 node = VP_TO_TMPFS_NODE(ap->a_vp); 1551 1552 tfhp->tf_len = sizeof(struct tmpfs_fid); 1553 tfhp->tf_id = node->tn_id; 1554 tfhp->tf_gen = node->tn_gen; 1555 1556 return (0); 1557 } 1558 1559 static int 1560 tmpfs_whiteout(struct vop_whiteout_args *ap) 1561 { 1562 struct vnode *dvp = ap->a_dvp; 1563 struct componentname *cnp = ap->a_cnp; 1564 struct tmpfs_dirent *de; 1565 1566 switch (ap->a_flags) { 1567 case LOOKUP: 1568 return (0); 1569 case CREATE: 1570 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1571 if (de != NULL) 1572 return (de->td_node == NULL ? 0 : EEXIST); 1573 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1574 case DELETE: 1575 tmpfs_dir_whiteout_remove(dvp, cnp); 1576 return (0); 1577 default: 1578 panic("tmpfs_whiteout: unknown op"); 1579 } 1580 } 1581 1582 /* --------------------------------------------------------------------- */ 1583 1584 /* 1585 * vnode operations vector used for files stored in a tmpfs file system. 1586 */ 1587 struct vop_vector tmpfs_vnodeop_entries = { 1588 .vop_default = &default_vnodeops, 1589 .vop_lookup = vfs_cache_lookup, 1590 .vop_cachedlookup = tmpfs_lookup, 1591 .vop_create = tmpfs_create, 1592 .vop_mknod = tmpfs_mknod, 1593 .vop_open = tmpfs_open, 1594 .vop_close = tmpfs_close, 1595 .vop_access = tmpfs_access, 1596 .vop_getattr = tmpfs_getattr, 1597 .vop_setattr = tmpfs_setattr, 1598 .vop_read = tmpfs_read, 1599 .vop_write = tmpfs_write, 1600 .vop_fsync = tmpfs_fsync, 1601 .vop_remove = tmpfs_remove, 1602 .vop_link = tmpfs_link, 1603 .vop_rename = tmpfs_rename, 1604 .vop_mkdir = tmpfs_mkdir, 1605 .vop_rmdir = tmpfs_rmdir, 1606 .vop_symlink = tmpfs_symlink, 1607 .vop_readdir = tmpfs_readdir, 1608 .vop_readlink = tmpfs_readlink, 1609 .vop_inactive = tmpfs_inactive, 1610 .vop_reclaim = tmpfs_reclaim, 1611 .vop_print = tmpfs_print, 1612 .vop_pathconf = tmpfs_pathconf, 1613 .vop_vptofh = tmpfs_vptofh, 1614 .vop_whiteout = tmpfs_whiteout, 1615 .vop_bmap = VOP_EOPNOTSUPP, 1616 }; 1617 1618