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) { 113 /* The entry was not found in the directory. 114 * This is OK if we are creating or renaming an 115 * entry and are working on the last component of 116 * the path name. */ 117 if ((cnp->cn_flags & ISLASTCN) && 118 (cnp->cn_nameiop == CREATE || \ 119 cnp->cn_nameiop == RENAME)) { 120 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 121 cnp->cn_thread); 122 if (error != 0) 123 goto out; 124 125 /* Keep the component name in the buffer for 126 * future uses. */ 127 cnp->cn_flags |= SAVENAME; 128 129 error = EJUSTRETURN; 130 } else 131 error = ENOENT; 132 } else { 133 struct tmpfs_node *tnode; 134 135 /* The entry was found, so get its associated 136 * tmpfs_node. */ 137 tnode = de->td_node; 138 139 /* If we are not at the last path component and 140 * found a non-directory or non-link entry (which 141 * may itself be pointing to a directory), raise 142 * an error. */ 143 if ((tnode->tn_type != VDIR && 144 tnode->tn_type != VLNK) && 145 !(cnp->cn_flags & ISLASTCN)) { 146 error = ENOTDIR; 147 goto out; 148 } 149 150 /* If we are deleting or renaming the entry, keep 151 * track of its tmpfs_dirent so that it can be 152 * easily deleted later. */ 153 if ((cnp->cn_flags & ISLASTCN) && 154 (cnp->cn_nameiop == DELETE || 155 cnp->cn_nameiop == RENAME)) { 156 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 157 cnp->cn_thread); 158 if (error != 0) 159 goto out; 160 161 /* Allocate a new vnode on the matching entry. */ 162 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 163 cnp->cn_lkflags, vpp); 164 if (error != 0) 165 goto out; 166 167 if ((dnode->tn_mode & S_ISTXT) && 168 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, cnp->cn_thread) && 169 VOP_ACCESS(*vpp, VADMIN, cnp->cn_cred, cnp->cn_thread)) { 170 error = EPERM; 171 vput(*vpp); 172 *vpp = NULL; 173 goto out; 174 } 175 cnp->cn_flags |= SAVENAME; 176 } else { 177 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 178 cnp->cn_lkflags, vpp); 179 } 180 } 181 } 182 183 /* Store the result of this lookup in the cache. Avoid this if the 184 * request was for creation, as it does not improve timings on 185 * emprical tests. */ 186 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) 187 cache_enter(dvp, *vpp, cnp); 188 189 out: 190 /* If there were no errors, *vpp cannot be null and it must be 191 * locked. */ 192 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp))); 193 194 return error; 195 } 196 197 /* --------------------------------------------------------------------- */ 198 199 static int 200 tmpfs_create(struct vop_create_args *v) 201 { 202 struct vnode *dvp = v->a_dvp; 203 struct vnode **vpp = v->a_vpp; 204 struct componentname *cnp = v->a_cnp; 205 struct vattr *vap = v->a_vap; 206 207 MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 208 209 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 210 } 211 /* --------------------------------------------------------------------- */ 212 213 static int 214 tmpfs_mknod(struct vop_mknod_args *v) 215 { 216 struct vnode *dvp = v->a_dvp; 217 struct vnode **vpp = v->a_vpp; 218 struct componentname *cnp = v->a_cnp; 219 struct vattr *vap = v->a_vap; 220 221 if (vap->va_type != VBLK && vap->va_type != VCHR && 222 vap->va_type != VFIFO) 223 return EINVAL; 224 225 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 226 } 227 228 /* --------------------------------------------------------------------- */ 229 230 static int 231 tmpfs_open(struct vop_open_args *v) 232 { 233 struct vnode *vp = v->a_vp; 234 int mode = v->a_mode; 235 236 int error; 237 struct tmpfs_node *node; 238 239 MPASS(VOP_ISLOCKED(vp)); 240 241 node = VP_TO_TMPFS_NODE(vp); 242 243 /* The file is still active but all its names have been removed 244 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 245 * it is about to die. */ 246 if (node->tn_links < 1) 247 return (ENOENT); 248 249 /* If the file is marked append-only, deny write requests. */ 250 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 251 error = EPERM; 252 else { 253 error = 0; 254 vnode_create_vobject(vp, node->tn_size, v->a_td); 255 } 256 257 MPASS(VOP_ISLOCKED(vp)); 258 return error; 259 } 260 261 /* --------------------------------------------------------------------- */ 262 263 static int 264 tmpfs_close(struct vop_close_args *v) 265 { 266 struct vnode *vp = v->a_vp; 267 268 struct tmpfs_node *node; 269 270 MPASS(VOP_ISLOCKED(vp)); 271 272 node = VP_TO_TMPFS_NODE(vp); 273 274 if (node->tn_links > 0) { 275 /* Update node times. No need to do it if the node has 276 * been deleted, because it will vanish after we return. */ 277 tmpfs_update(vp); 278 } 279 280 return 0; 281 } 282 283 /* --------------------------------------------------------------------- */ 284 285 int 286 tmpfs_access(struct vop_access_args *v) 287 { 288 struct vnode *vp = v->a_vp; 289 accmode_t accmode = v->a_accmode; 290 struct ucred *cred = v->a_cred; 291 292 int error; 293 struct tmpfs_node *node; 294 295 MPASS(VOP_ISLOCKED(vp)); 296 297 node = VP_TO_TMPFS_NODE(vp); 298 299 switch (vp->v_type) { 300 case VDIR: 301 /* FALLTHROUGH */ 302 case VLNK: 303 /* FALLTHROUGH */ 304 case VREG: 305 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 306 error = EROFS; 307 goto out; 308 } 309 break; 310 311 case VBLK: 312 /* FALLTHROUGH */ 313 case VCHR: 314 /* FALLTHROUGH */ 315 case VSOCK: 316 /* FALLTHROUGH */ 317 case VFIFO: 318 break; 319 320 default: 321 error = EINVAL; 322 goto out; 323 } 324 325 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 326 error = EPERM; 327 goto out; 328 } 329 330 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 331 node->tn_gid, accmode, cred, NULL); 332 333 out: 334 MPASS(VOP_ISLOCKED(vp)); 335 336 return error; 337 } 338 339 /* --------------------------------------------------------------------- */ 340 341 int 342 tmpfs_getattr(struct vop_getattr_args *v) 343 { 344 struct vnode *vp = v->a_vp; 345 struct vattr *vap = v->a_vap; 346 347 struct tmpfs_node *node; 348 349 node = VP_TO_TMPFS_NODE(vp); 350 351 tmpfs_update(vp); 352 353 vap->va_type = vp->v_type; 354 vap->va_mode = node->tn_mode; 355 vap->va_nlink = node->tn_links; 356 vap->va_uid = node->tn_uid; 357 vap->va_gid = node->tn_gid; 358 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 359 vap->va_fileid = node->tn_id; 360 vap->va_size = node->tn_size; 361 vap->va_blocksize = PAGE_SIZE; 362 vap->va_atime = node->tn_atime; 363 vap->va_mtime = node->tn_mtime; 364 vap->va_ctime = node->tn_ctime; 365 vap->va_birthtime = node->tn_birthtime; 366 vap->va_gen = node->tn_gen; 367 vap->va_flags = node->tn_flags; 368 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 369 node->tn_rdev : NODEV; 370 vap->va_bytes = round_page(node->tn_size); 371 vap->va_filerev = 0; 372 373 return 0; 374 } 375 376 /* --------------------------------------------------------------------- */ 377 378 /* XXX Should this operation be atomic? I think it should, but code in 379 * XXX other places (e.g., ufs) doesn't seem to be... */ 380 int 381 tmpfs_setattr(struct vop_setattr_args *v) 382 { 383 struct vnode *vp = v->a_vp; 384 struct vattr *vap = v->a_vap; 385 struct ucred *cred = v->a_cred; 386 struct thread *td = curthread; 387 388 int error; 389 390 MPASS(VOP_ISLOCKED(vp)); 391 392 error = 0; 393 394 /* Abort if any unsettable attribute is given. */ 395 if (vap->va_type != VNON || 396 vap->va_nlink != VNOVAL || 397 vap->va_fsid != VNOVAL || 398 vap->va_fileid != VNOVAL || 399 vap->va_blocksize != VNOVAL || 400 vap->va_gen != VNOVAL || 401 vap->va_rdev != VNOVAL || 402 vap->va_bytes != VNOVAL) 403 error = EINVAL; 404 405 if (error == 0 && (vap->va_flags != VNOVAL)) 406 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 407 408 if (error == 0 && (vap->va_size != VNOVAL)) 409 error = tmpfs_chsize(vp, vap->va_size, cred, td); 410 411 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 412 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 413 414 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 415 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 416 417 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 418 vap->va_atime.tv_nsec != VNOVAL) || 419 (vap->va_mtime.tv_sec != VNOVAL && 420 vap->va_mtime.tv_nsec != VNOVAL) || 421 (vap->va_birthtime.tv_sec != VNOVAL && 422 vap->va_birthtime.tv_nsec != VNOVAL))) 423 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 424 &vap->va_birthtime, vap->va_vaflags, cred, td); 425 426 /* Update the node times. We give preference to the error codes 427 * generated by this function rather than the ones that may arise 428 * from tmpfs_update. */ 429 tmpfs_update(vp); 430 431 MPASS(VOP_ISLOCKED(vp)); 432 433 return error; 434 } 435 436 /* --------------------------------------------------------------------- */ 437 static int 438 tmpfs_nocacheread(vm_object_t tobj, vm_pindex_t idx, 439 vm_offset_t offset, size_t tlen, struct uio *uio) 440 { 441 vm_page_t m; 442 int error; 443 444 VM_OBJECT_LOCK(tobj); 445 vm_object_pip_add(tobj, 1); 446 m = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 447 VM_ALLOC_ZERO | VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 448 if (m->valid != VM_PAGE_BITS_ALL) { 449 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 450 error = vm_pager_get_pages(tobj, &m, 1, 0); 451 if (error != 0) { 452 printf("tmpfs get pages from pager error [read]\n"); 453 goto out; 454 } 455 } else 456 vm_page_zero_invalid(m, TRUE); 457 } 458 VM_OBJECT_UNLOCK(tobj); 459 error = uiomove_fromphys(&m, offset, tlen, uio); 460 VM_OBJECT_LOCK(tobj); 461 out: 462 vm_page_lock(m); 463 vm_page_unwire(m, TRUE); 464 vm_page_unlock(m); 465 vm_page_wakeup(m); 466 vm_object_pip_subtract(tobj, 1); 467 VM_OBJECT_UNLOCK(tobj); 468 469 return (error); 470 } 471 472 static __inline int 473 tmpfs_nocacheread_buf(vm_object_t tobj, vm_pindex_t idx, 474 vm_offset_t offset, size_t tlen, void *buf) 475 { 476 struct uio uio; 477 struct iovec iov; 478 479 uio.uio_iovcnt = 1; 480 uio.uio_iov = &iov; 481 iov.iov_base = buf; 482 iov.iov_len = tlen; 483 484 uio.uio_offset = 0; 485 uio.uio_resid = tlen; 486 uio.uio_rw = UIO_READ; 487 uio.uio_segflg = UIO_SYSSPACE; 488 uio.uio_td = curthread; 489 490 return (tmpfs_nocacheread(tobj, idx, offset, tlen, &uio)); 491 } 492 493 static int 494 tmpfs_mappedread(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 495 { 496 struct sf_buf *sf; 497 vm_pindex_t idx; 498 vm_page_t m; 499 vm_offset_t offset; 500 off_t addr; 501 size_t tlen; 502 char *ma; 503 int error; 504 505 addr = uio->uio_offset; 506 idx = OFF_TO_IDX(addr); 507 offset = addr & PAGE_MASK; 508 tlen = MIN(PAGE_SIZE - offset, len); 509 510 if ((vobj == NULL) || 511 (vobj->resident_page_count == 0 && vobj->cache == NULL)) 512 goto nocache; 513 514 VM_OBJECT_LOCK(vobj); 515 lookupvpg: 516 if (((m = vm_page_lookup(vobj, idx)) != NULL) && 517 vm_page_is_valid(m, offset, tlen)) { 518 if ((m->oflags & VPO_BUSY) != 0) { 519 /* 520 * Reference the page before unlocking and sleeping so 521 * that the page daemon is less likely to reclaim it. 522 */ 523 vm_page_lock_queues(); 524 vm_page_flag_set(m, PG_REFERENCED); 525 vm_page_sleep(m, "tmfsmr"); 526 goto lookupvpg; 527 } 528 vm_page_busy(m); 529 VM_OBJECT_UNLOCK(vobj); 530 error = uiomove_fromphys(&m, offset, tlen, uio); 531 VM_OBJECT_LOCK(vobj); 532 vm_page_wakeup(m); 533 VM_OBJECT_UNLOCK(vobj); 534 return (error); 535 } else if (m != NULL && uio->uio_segflg == UIO_NOCOPY) { 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, offset, tlen, 552 ma + offset); 553 if (error == 0) { 554 uio->uio_offset += tlen; 555 uio->uio_resid -= tlen; 556 } 557 sf_buf_free(sf); 558 sched_unpin(); 559 VM_OBJECT_LOCK(vobj); 560 vm_page_wakeup(m); 561 VM_OBJECT_UNLOCK(vobj); 562 return (error); 563 } 564 VM_OBJECT_UNLOCK(vobj); 565 nocache: 566 error = tmpfs_nocacheread(tobj, idx, offset, tlen, uio); 567 568 return (error); 569 } 570 571 static int 572 tmpfs_read(struct vop_read_args *v) 573 { 574 struct vnode *vp = v->a_vp; 575 struct uio *uio = v->a_uio; 576 577 struct tmpfs_node *node; 578 vm_object_t uobj; 579 size_t len; 580 int resid; 581 582 int error = 0; 583 584 node = VP_TO_TMPFS_NODE(vp); 585 586 if (vp->v_type != VREG) { 587 error = EISDIR; 588 goto out; 589 } 590 591 if (uio->uio_offset < 0) { 592 error = EINVAL; 593 goto out; 594 } 595 596 node->tn_status |= TMPFS_NODE_ACCESSED; 597 598 uobj = node->tn_reg.tn_aobj; 599 while ((resid = uio->uio_resid) > 0) { 600 error = 0; 601 if (node->tn_size <= uio->uio_offset) 602 break; 603 len = MIN(node->tn_size - uio->uio_offset, resid); 604 if (len == 0) 605 break; 606 error = tmpfs_mappedread(vp->v_object, uobj, len, uio); 607 if ((error != 0) || (resid == uio->uio_resid)) 608 break; 609 } 610 611 out: 612 613 return error; 614 } 615 616 /* --------------------------------------------------------------------- */ 617 618 static int 619 tmpfs_mappedwrite(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 620 { 621 vm_pindex_t idx; 622 vm_page_t vpg, tpg; 623 vm_offset_t offset; 624 off_t addr; 625 size_t tlen; 626 int error; 627 628 error = 0; 629 630 addr = uio->uio_offset; 631 idx = OFF_TO_IDX(addr); 632 offset = addr & PAGE_MASK; 633 tlen = MIN(PAGE_SIZE - offset, len); 634 635 if ((vobj == NULL) || 636 (vobj->resident_page_count == 0 && vobj->cache == NULL)) { 637 vpg = NULL; 638 goto nocache; 639 } 640 641 VM_OBJECT_LOCK(vobj); 642 lookupvpg: 643 if (((vpg = vm_page_lookup(vobj, idx)) != NULL) && 644 vm_page_is_valid(vpg, offset, tlen)) { 645 if ((vpg->oflags & VPO_BUSY) != 0) { 646 /* 647 * Reference the page before unlocking and sleeping so 648 * that the page daemon is less likely to reclaim it. 649 */ 650 vm_page_lock_queues(); 651 vm_page_flag_set(vpg, PG_REFERENCED); 652 vm_page_sleep(vpg, "tmfsmw"); 653 goto lookupvpg; 654 } 655 vm_page_busy(vpg); 656 vm_page_undirty(vpg); 657 VM_OBJECT_UNLOCK(vobj); 658 error = uiomove_fromphys(&vpg, offset, tlen, uio); 659 } else { 660 if (__predict_false(vobj->cache != NULL)) 661 vm_page_cache_free(vobj, idx, idx + 1); 662 VM_OBJECT_UNLOCK(vobj); 663 vpg = NULL; 664 } 665 nocache: 666 VM_OBJECT_LOCK(tobj); 667 vm_object_pip_add(tobj, 1); 668 tpg = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 669 VM_ALLOC_ZERO | VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 670 if (tpg->valid != VM_PAGE_BITS_ALL) { 671 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 672 error = vm_pager_get_pages(tobj, &tpg, 1, 0); 673 if (error != 0) { 674 printf("tmpfs get pages from pager error [write]\n"); 675 goto out; 676 } 677 } else 678 vm_page_zero_invalid(tpg, TRUE); 679 } 680 VM_OBJECT_UNLOCK(tobj); 681 if (vpg == NULL) 682 error = uiomove_fromphys(&tpg, offset, tlen, uio); 683 else { 684 KASSERT(vpg->valid == VM_PAGE_BITS_ALL, ("parts of vpg invalid")); 685 pmap_copy_page(vpg, tpg); 686 } 687 VM_OBJECT_LOCK(tobj); 688 out: 689 if (vobj != NULL) 690 VM_OBJECT_LOCK(vobj); 691 if (error == 0) { 692 KASSERT(tpg->valid == VM_PAGE_BITS_ALL, 693 ("parts of tpg invalid")); 694 vm_page_dirty(tpg); 695 } 696 vm_page_lock(tpg); 697 vm_page_unwire(tpg, TRUE); 698 vm_page_unlock(tpg); 699 vm_page_wakeup(tpg); 700 if (vpg != NULL) 701 vm_page_wakeup(vpg); 702 if (vobj != NULL) 703 VM_OBJECT_UNLOCK(vobj); 704 vm_object_pip_subtract(tobj, 1); 705 VM_OBJECT_UNLOCK(tobj); 706 707 return (error); 708 } 709 710 static int 711 tmpfs_write(struct vop_write_args *v) 712 { 713 struct vnode *vp = v->a_vp; 714 struct uio *uio = v->a_uio; 715 int ioflag = v->a_ioflag; 716 717 boolean_t extended; 718 int error = 0; 719 off_t oldsize; 720 struct tmpfs_node *node; 721 vm_object_t uobj; 722 size_t len; 723 int resid; 724 725 node = VP_TO_TMPFS_NODE(vp); 726 oldsize = node->tn_size; 727 728 if (uio->uio_offset < 0 || vp->v_type != VREG) { 729 error = EINVAL; 730 goto out; 731 } 732 733 if (uio->uio_resid == 0) { 734 error = 0; 735 goto out; 736 } 737 738 if (ioflag & IO_APPEND) 739 uio->uio_offset = node->tn_size; 740 741 if (uio->uio_offset + uio->uio_resid > 742 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 743 return (EFBIG); 744 745 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 746 return (EFBIG); 747 748 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 749 if (extended) { 750 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 751 if (error != 0) 752 goto out; 753 } 754 755 uobj = node->tn_reg.tn_aobj; 756 while ((resid = uio->uio_resid) > 0) { 757 if (node->tn_size <= uio->uio_offset) 758 break; 759 len = MIN(node->tn_size - uio->uio_offset, resid); 760 if (len == 0) 761 break; 762 error = tmpfs_mappedwrite(vp->v_object, uobj, len, uio); 763 if ((error != 0) || (resid == uio->uio_resid)) 764 break; 765 } 766 767 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 768 (extended ? TMPFS_NODE_CHANGED : 0); 769 770 if (node->tn_mode & (S_ISUID | S_ISGID)) { 771 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 772 node->tn_mode &= ~(S_ISUID | S_ISGID); 773 } 774 775 if (error != 0) 776 (void)tmpfs_reg_resize(vp, oldsize); 777 778 out: 779 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 780 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 781 782 return error; 783 } 784 785 /* --------------------------------------------------------------------- */ 786 787 static int 788 tmpfs_fsync(struct vop_fsync_args *v) 789 { 790 struct vnode *vp = v->a_vp; 791 792 MPASS(VOP_ISLOCKED(vp)); 793 794 tmpfs_update(vp); 795 796 return 0; 797 } 798 799 /* --------------------------------------------------------------------- */ 800 801 static int 802 tmpfs_remove(struct vop_remove_args *v) 803 { 804 struct vnode *dvp = v->a_dvp; 805 struct vnode *vp = v->a_vp; 806 807 int error; 808 struct tmpfs_dirent *de; 809 struct tmpfs_mount *tmp; 810 struct tmpfs_node *dnode; 811 struct tmpfs_node *node; 812 813 MPASS(VOP_ISLOCKED(dvp)); 814 MPASS(VOP_ISLOCKED(vp)); 815 816 if (vp->v_type == VDIR) { 817 error = EISDIR; 818 goto out; 819 } 820 821 dnode = VP_TO_TMPFS_DIR(dvp); 822 node = VP_TO_TMPFS_NODE(vp); 823 tmp = VFS_TO_TMPFS(vp->v_mount); 824 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 825 MPASS(de != NULL); 826 827 /* Files marked as immutable or append-only cannot be deleted. */ 828 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 829 (dnode->tn_flags & APPEND)) { 830 error = EPERM; 831 goto out; 832 } 833 834 /* Remove the entry from the directory; as it is a file, we do not 835 * have to change the number of hard links of the directory. */ 836 tmpfs_dir_detach(dvp, de); 837 838 /* Free the directory entry we just deleted. Note that the node 839 * referred by it will not be removed until the vnode is really 840 * reclaimed. */ 841 tmpfs_free_dirent(tmp, de, TRUE); 842 843 if (node->tn_links > 0) 844 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 845 TMPFS_NODE_MODIFIED; 846 error = 0; 847 848 out: 849 850 return error; 851 } 852 853 /* --------------------------------------------------------------------- */ 854 855 static int 856 tmpfs_link(struct vop_link_args *v) 857 { 858 struct vnode *dvp = v->a_tdvp; 859 struct vnode *vp = v->a_vp; 860 struct componentname *cnp = v->a_cnp; 861 862 int error; 863 struct tmpfs_dirent *de; 864 struct tmpfs_node *node; 865 866 MPASS(VOP_ISLOCKED(dvp)); 867 MPASS(cnp->cn_flags & HASBUF); 868 MPASS(dvp != vp); /* XXX When can this be false? */ 869 870 node = VP_TO_TMPFS_NODE(vp); 871 872 /* XXX: Why aren't the following two tests done by the caller? */ 873 874 /* Hard links of directories are forbidden. */ 875 if (vp->v_type == VDIR) { 876 error = EPERM; 877 goto out; 878 } 879 880 /* Cannot create cross-device links. */ 881 if (dvp->v_mount != vp->v_mount) { 882 error = EXDEV; 883 goto out; 884 } 885 886 /* Ensure that we do not overflow the maximum number of links imposed 887 * by the system. */ 888 MPASS(node->tn_links <= LINK_MAX); 889 if (node->tn_links == LINK_MAX) { 890 error = EMLINK; 891 goto out; 892 } 893 894 /* We cannot create links of files marked immutable or append-only. */ 895 if (node->tn_flags & (IMMUTABLE | APPEND)) { 896 error = EPERM; 897 goto out; 898 } 899 900 /* Allocate a new directory entry to represent the node. */ 901 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 902 cnp->cn_nameptr, cnp->cn_namelen, &de); 903 if (error != 0) 904 goto out; 905 906 /* Insert the new directory entry into the appropriate directory. */ 907 tmpfs_dir_attach(dvp, de); 908 909 /* vp link count has changed, so update node times. */ 910 node->tn_status |= TMPFS_NODE_CHANGED; 911 tmpfs_update(vp); 912 913 error = 0; 914 915 out: 916 return error; 917 } 918 919 /* --------------------------------------------------------------------- */ 920 921 static int 922 tmpfs_rename(struct vop_rename_args *v) 923 { 924 struct vnode *fdvp = v->a_fdvp; 925 struct vnode *fvp = v->a_fvp; 926 struct componentname *fcnp = v->a_fcnp; 927 struct vnode *tdvp = v->a_tdvp; 928 struct vnode *tvp = v->a_tvp; 929 struct componentname *tcnp = v->a_tcnp; 930 931 char *newname; 932 int error; 933 struct tmpfs_dirent *de; 934 struct tmpfs_mount *tmp; 935 struct tmpfs_node *fdnode; 936 struct tmpfs_node *fnode; 937 struct tmpfs_node *tnode; 938 struct tmpfs_node *tdnode; 939 940 MPASS(VOP_ISLOCKED(tdvp)); 941 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 942 MPASS(fcnp->cn_flags & HASBUF); 943 MPASS(tcnp->cn_flags & HASBUF); 944 945 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 946 947 /* Disallow cross-device renames. 948 * XXX Why isn't this done by the caller? */ 949 if (fvp->v_mount != tdvp->v_mount || 950 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 951 error = EXDEV; 952 goto out; 953 } 954 955 tmp = VFS_TO_TMPFS(tdvp->v_mount); 956 tdnode = VP_TO_TMPFS_DIR(tdvp); 957 958 /* If source and target are the same file, there is nothing to do. */ 959 if (fvp == tvp) { 960 error = 0; 961 goto out; 962 } 963 964 /* If we need to move the directory between entries, lock the 965 * source so that we can safely operate on it. */ 966 if (tdvp != fdvp) { 967 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 968 if (error != 0) 969 goto out; 970 } 971 fdnode = VP_TO_TMPFS_DIR(fdvp); 972 fnode = VP_TO_TMPFS_NODE(fvp); 973 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 974 975 /* Avoid manipulating '.' and '..' entries. */ 976 if (de == NULL) { 977 MPASS(fvp->v_type == VDIR); 978 error = EINVAL; 979 goto out_locked; 980 } 981 MPASS(de->td_node == fnode); 982 983 /* If re-naming a directory to another preexisting directory 984 * ensure that the target directory is empty so that its 985 * removal causes no side effects. 986 * Kern_rename gurantees the destination to be a directory 987 * if the source is one. */ 988 if (tvp != NULL) { 989 MPASS(tnode != NULL); 990 991 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 992 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 993 error = EPERM; 994 goto out_locked; 995 } 996 997 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 998 if (tnode->tn_size > 0) { 999 error = ENOTEMPTY; 1000 goto out_locked; 1001 } 1002 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 1003 error = ENOTDIR; 1004 goto out_locked; 1005 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 1006 error = EISDIR; 1007 goto out_locked; 1008 } else { 1009 MPASS(fnode->tn_type != VDIR && 1010 tnode->tn_type != VDIR); 1011 } 1012 } 1013 1014 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 1015 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 1016 error = EPERM; 1017 goto out_locked; 1018 } 1019 1020 /* Ensure that we have enough memory to hold the new name, if it 1021 * has to be changed. */ 1022 if (fcnp->cn_namelen != tcnp->cn_namelen || 1023 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 1024 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 1025 } else 1026 newname = NULL; 1027 1028 /* If the node is being moved to another directory, we have to do 1029 * the move. */ 1030 if (fdnode != tdnode) { 1031 /* In case we are moving a directory, we have to adjust its 1032 * parent to point to the new parent. */ 1033 if (de->td_node->tn_type == VDIR) { 1034 struct tmpfs_node *n; 1035 1036 /* Ensure the target directory is not a child of the 1037 * directory being moved. Otherwise, we'd end up 1038 * with stale nodes. */ 1039 n = tdnode; 1040 /* TMPFS_LOCK garanties that no nodes are freed while 1041 * traversing the list. Nodes can only be marked as 1042 * removed: tn_parent == NULL. */ 1043 TMPFS_LOCK(tmp); 1044 TMPFS_NODE_LOCK(n); 1045 while (n != n->tn_dir.tn_parent) { 1046 struct tmpfs_node *parent; 1047 1048 if (n == fnode) { 1049 TMPFS_NODE_UNLOCK(n); 1050 TMPFS_UNLOCK(tmp); 1051 error = EINVAL; 1052 if (newname != NULL) 1053 free(newname, M_TMPFSNAME); 1054 goto out_locked; 1055 } 1056 parent = n->tn_dir.tn_parent; 1057 TMPFS_NODE_UNLOCK(n); 1058 if (parent == NULL) { 1059 n = NULL; 1060 break; 1061 } 1062 TMPFS_NODE_LOCK(parent); 1063 if (parent->tn_dir.tn_parent == NULL) { 1064 TMPFS_NODE_UNLOCK(parent); 1065 n = NULL; 1066 break; 1067 } 1068 n = parent; 1069 } 1070 TMPFS_UNLOCK(tmp); 1071 if (n == NULL) { 1072 error = EINVAL; 1073 if (newname != NULL) 1074 free(newname, M_TMPFSNAME); 1075 goto out_locked; 1076 } 1077 TMPFS_NODE_UNLOCK(n); 1078 1079 /* Adjust the parent pointer. */ 1080 TMPFS_VALIDATE_DIR(fnode); 1081 TMPFS_NODE_LOCK(de->td_node); 1082 de->td_node->tn_dir.tn_parent = tdnode; 1083 TMPFS_NODE_UNLOCK(de->td_node); 1084 1085 /* As a result of changing the target of the '..' 1086 * entry, the link count of the source and target 1087 * directories has to be adjusted. */ 1088 TMPFS_NODE_LOCK(tdnode); 1089 TMPFS_ASSERT_LOCKED(tdnode); 1090 tdnode->tn_links++; 1091 TMPFS_NODE_UNLOCK(tdnode); 1092 1093 TMPFS_NODE_LOCK(fdnode); 1094 TMPFS_ASSERT_LOCKED(fdnode); 1095 fdnode->tn_links--; 1096 TMPFS_NODE_UNLOCK(fdnode); 1097 } 1098 1099 /* Do the move: just remove the entry from the source directory 1100 * and insert it into the target one. */ 1101 tmpfs_dir_detach(fdvp, de); 1102 tmpfs_dir_attach(tdvp, de); 1103 } 1104 1105 /* If the name has changed, we need to make it effective by changing 1106 * it in the directory entry. */ 1107 if (newname != NULL) { 1108 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1109 1110 free(de->td_name, M_TMPFSNAME); 1111 de->td_namelen = (uint16_t)tcnp->cn_namelen; 1112 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 1113 de->td_name = newname; 1114 1115 fnode->tn_status |= TMPFS_NODE_CHANGED; 1116 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1117 } 1118 1119 /* If we are overwriting an entry, we have to remove the old one 1120 * from the target directory. */ 1121 if (tvp != NULL) { 1122 /* Remove the old entry from the target directory. */ 1123 de = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1124 tmpfs_dir_detach(tdvp, de); 1125 1126 /* Free the directory entry we just deleted. Note that the 1127 * node referred by it will not be removed until the vnode is 1128 * really reclaimed. */ 1129 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 1130 } 1131 1132 error = 0; 1133 1134 out_locked: 1135 if (fdnode != tdnode) 1136 VOP_UNLOCK(fdvp, 0); 1137 1138 out: 1139 /* Release target nodes. */ 1140 /* XXX: I don't understand when tdvp can be the same as tvp, but 1141 * other code takes care of this... */ 1142 if (tdvp == tvp) 1143 vrele(tdvp); 1144 else 1145 vput(tdvp); 1146 if (tvp != NULL) 1147 vput(tvp); 1148 1149 /* Release source nodes. */ 1150 vrele(fdvp); 1151 vrele(fvp); 1152 1153 return error; 1154 } 1155 1156 /* --------------------------------------------------------------------- */ 1157 1158 static int 1159 tmpfs_mkdir(struct vop_mkdir_args *v) 1160 { 1161 struct vnode *dvp = v->a_dvp; 1162 struct vnode **vpp = v->a_vpp; 1163 struct componentname *cnp = v->a_cnp; 1164 struct vattr *vap = v->a_vap; 1165 1166 MPASS(vap->va_type == VDIR); 1167 1168 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1169 } 1170 1171 /* --------------------------------------------------------------------- */ 1172 1173 static int 1174 tmpfs_rmdir(struct vop_rmdir_args *v) 1175 { 1176 struct vnode *dvp = v->a_dvp; 1177 struct vnode *vp = v->a_vp; 1178 1179 int error; 1180 struct tmpfs_dirent *de; 1181 struct tmpfs_mount *tmp; 1182 struct tmpfs_node *dnode; 1183 struct tmpfs_node *node; 1184 1185 MPASS(VOP_ISLOCKED(dvp)); 1186 MPASS(VOP_ISLOCKED(vp)); 1187 1188 tmp = VFS_TO_TMPFS(dvp->v_mount); 1189 dnode = VP_TO_TMPFS_DIR(dvp); 1190 node = VP_TO_TMPFS_DIR(vp); 1191 1192 /* Directories with more than two entries ('.' and '..') cannot be 1193 * removed. */ 1194 if (node->tn_size > 0) { 1195 error = ENOTEMPTY; 1196 goto out; 1197 } 1198 1199 if ((dnode->tn_flags & APPEND) 1200 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1201 error = EPERM; 1202 goto out; 1203 } 1204 1205 /* This invariant holds only if we are not trying to remove "..". 1206 * We checked for that above so this is safe now. */ 1207 MPASS(node->tn_dir.tn_parent == dnode); 1208 1209 /* Get the directory entry associated with node (vp). This was 1210 * filled by tmpfs_lookup while looking up the entry. */ 1211 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1212 MPASS(TMPFS_DIRENT_MATCHES(de, 1213 v->a_cnp->cn_nameptr, 1214 v->a_cnp->cn_namelen)); 1215 1216 /* Check flags to see if we are allowed to remove the directory. */ 1217 if (dnode->tn_flags & APPEND 1218 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1219 error = EPERM; 1220 goto out; 1221 } 1222 1223 1224 /* Detach the directory entry from the directory (dnode). */ 1225 tmpfs_dir_detach(dvp, de); 1226 1227 /* No vnode should be allocated for this entry from this point */ 1228 TMPFS_NODE_LOCK(node); 1229 TMPFS_ASSERT_ELOCKED(node); 1230 node->tn_links--; 1231 node->tn_dir.tn_parent = NULL; 1232 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1233 TMPFS_NODE_MODIFIED; 1234 1235 TMPFS_NODE_UNLOCK(node); 1236 1237 TMPFS_NODE_LOCK(dnode); 1238 TMPFS_ASSERT_ELOCKED(dnode); 1239 dnode->tn_links--; 1240 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1241 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1242 TMPFS_NODE_UNLOCK(dnode); 1243 1244 cache_purge(dvp); 1245 cache_purge(vp); 1246 1247 /* Free the directory entry we just deleted. Note that the node 1248 * referred by it will not be removed until the vnode is really 1249 * reclaimed. */ 1250 tmpfs_free_dirent(tmp, de, TRUE); 1251 1252 /* Release the deleted vnode (will destroy the node, notify 1253 * interested parties and clean it from the cache). */ 1254 1255 dnode->tn_status |= TMPFS_NODE_CHANGED; 1256 tmpfs_update(dvp); 1257 1258 error = 0; 1259 1260 out: 1261 return error; 1262 } 1263 1264 /* --------------------------------------------------------------------- */ 1265 1266 static int 1267 tmpfs_symlink(struct vop_symlink_args *v) 1268 { 1269 struct vnode *dvp = v->a_dvp; 1270 struct vnode **vpp = v->a_vpp; 1271 struct componentname *cnp = v->a_cnp; 1272 struct vattr *vap = v->a_vap; 1273 char *target = v->a_target; 1274 1275 #ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1276 MPASS(vap->va_type == VLNK); 1277 #else 1278 vap->va_type = VLNK; 1279 #endif 1280 1281 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1282 } 1283 1284 /* --------------------------------------------------------------------- */ 1285 1286 static int 1287 tmpfs_readdir(struct vop_readdir_args *v) 1288 { 1289 struct vnode *vp = v->a_vp; 1290 struct uio *uio = v->a_uio; 1291 int *eofflag = v->a_eofflag; 1292 u_long **cookies = v->a_cookies; 1293 int *ncookies = v->a_ncookies; 1294 1295 int error; 1296 off_t startoff; 1297 off_t cnt = 0; 1298 struct tmpfs_node *node; 1299 1300 /* This operation only makes sense on directory nodes. */ 1301 if (vp->v_type != VDIR) 1302 return ENOTDIR; 1303 1304 node = VP_TO_TMPFS_DIR(vp); 1305 1306 startoff = uio->uio_offset; 1307 1308 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1309 error = tmpfs_dir_getdotdent(node, uio); 1310 if (error != 0) 1311 goto outok; 1312 cnt++; 1313 } 1314 1315 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1316 error = tmpfs_dir_getdotdotdent(node, uio); 1317 if (error != 0) 1318 goto outok; 1319 cnt++; 1320 } 1321 1322 error = tmpfs_dir_getdents(node, uio, &cnt); 1323 1324 outok: 1325 MPASS(error >= -1); 1326 1327 if (error == -1) 1328 error = 0; 1329 1330 if (eofflag != NULL) 1331 *eofflag = 1332 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1333 1334 /* Update NFS-related variables. */ 1335 if (error == 0 && cookies != NULL && ncookies != NULL) { 1336 off_t i; 1337 off_t off = startoff; 1338 struct tmpfs_dirent *de = NULL; 1339 1340 *ncookies = cnt; 1341 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1342 1343 for (i = 0; i < cnt; i++) { 1344 MPASS(off != TMPFS_DIRCOOKIE_EOF); 1345 if (off == TMPFS_DIRCOOKIE_DOT) { 1346 off = TMPFS_DIRCOOKIE_DOTDOT; 1347 } else { 1348 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1349 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead); 1350 } else if (de != NULL) { 1351 de = TAILQ_NEXT(de, td_entries); 1352 } else { 1353 de = tmpfs_dir_lookupbycookie(node, 1354 off); 1355 MPASS(de != NULL); 1356 de = TAILQ_NEXT(de, td_entries); 1357 } 1358 if (de == NULL) 1359 off = TMPFS_DIRCOOKIE_EOF; 1360 else 1361 off = tmpfs_dircookie(de); 1362 } 1363 1364 (*cookies)[i] = off; 1365 } 1366 MPASS(uio->uio_offset == off); 1367 } 1368 1369 return error; 1370 } 1371 1372 /* --------------------------------------------------------------------- */ 1373 1374 static int 1375 tmpfs_readlink(struct vop_readlink_args *v) 1376 { 1377 struct vnode *vp = v->a_vp; 1378 struct uio *uio = v->a_uio; 1379 1380 int error; 1381 struct tmpfs_node *node; 1382 1383 MPASS(uio->uio_offset == 0); 1384 MPASS(vp->v_type == VLNK); 1385 1386 node = VP_TO_TMPFS_NODE(vp); 1387 1388 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1389 uio); 1390 node->tn_status |= TMPFS_NODE_ACCESSED; 1391 1392 return error; 1393 } 1394 1395 /* --------------------------------------------------------------------- */ 1396 1397 static int 1398 tmpfs_inactive(struct vop_inactive_args *v) 1399 { 1400 struct vnode *vp = v->a_vp; 1401 struct thread *l = v->a_td; 1402 1403 struct tmpfs_node *node; 1404 1405 MPASS(VOP_ISLOCKED(vp)); 1406 1407 node = VP_TO_TMPFS_NODE(vp); 1408 1409 if (node->tn_links == 0) 1410 vrecycle(vp, l); 1411 1412 return 0; 1413 } 1414 1415 /* --------------------------------------------------------------------- */ 1416 1417 int 1418 tmpfs_reclaim(struct vop_reclaim_args *v) 1419 { 1420 struct vnode *vp = v->a_vp; 1421 1422 struct tmpfs_mount *tmp; 1423 struct tmpfs_node *node; 1424 1425 node = VP_TO_TMPFS_NODE(vp); 1426 tmp = VFS_TO_TMPFS(vp->v_mount); 1427 1428 vnode_destroy_vobject(vp); 1429 cache_purge(vp); 1430 1431 TMPFS_NODE_LOCK(node); 1432 TMPFS_ASSERT_ELOCKED(node); 1433 tmpfs_free_vp(vp); 1434 1435 /* If the node referenced by this vnode was deleted by the user, 1436 * we must free its associated data structures (now that the vnode 1437 * is being reclaimed). */ 1438 if (node->tn_links == 0 && 1439 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1440 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1441 TMPFS_NODE_UNLOCK(node); 1442 tmpfs_free_node(tmp, node); 1443 } else 1444 TMPFS_NODE_UNLOCK(node); 1445 1446 MPASS(vp->v_data == NULL); 1447 return 0; 1448 } 1449 1450 /* --------------------------------------------------------------------- */ 1451 1452 static int 1453 tmpfs_print(struct vop_print_args *v) 1454 { 1455 struct vnode *vp = v->a_vp; 1456 1457 struct tmpfs_node *node; 1458 1459 node = VP_TO_TMPFS_NODE(vp); 1460 1461 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1462 node, node->tn_flags, node->tn_links); 1463 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1464 ", status 0x%x\n", 1465 node->tn_mode, node->tn_uid, node->tn_gid, 1466 (uintmax_t)node->tn_size, node->tn_status); 1467 1468 if (vp->v_type == VFIFO) 1469 fifo_printinfo(vp); 1470 1471 printf("\n"); 1472 1473 return 0; 1474 } 1475 1476 /* --------------------------------------------------------------------- */ 1477 1478 static int 1479 tmpfs_pathconf(struct vop_pathconf_args *v) 1480 { 1481 int name = v->a_name; 1482 register_t *retval = v->a_retval; 1483 1484 int error; 1485 1486 error = 0; 1487 1488 switch (name) { 1489 case _PC_LINK_MAX: 1490 *retval = LINK_MAX; 1491 break; 1492 1493 case _PC_NAME_MAX: 1494 *retval = NAME_MAX; 1495 break; 1496 1497 case _PC_PATH_MAX: 1498 *retval = PATH_MAX; 1499 break; 1500 1501 case _PC_PIPE_BUF: 1502 *retval = PIPE_BUF; 1503 break; 1504 1505 case _PC_CHOWN_RESTRICTED: 1506 *retval = 1; 1507 break; 1508 1509 case _PC_NO_TRUNC: 1510 *retval = 1; 1511 break; 1512 1513 case _PC_SYNC_IO: 1514 *retval = 1; 1515 break; 1516 1517 case _PC_FILESIZEBITS: 1518 *retval = 0; /* XXX Don't know which value should I return. */ 1519 break; 1520 1521 default: 1522 error = EINVAL; 1523 } 1524 1525 return error; 1526 } 1527 1528 static int 1529 tmpfs_vptofh(struct vop_vptofh_args *ap) 1530 { 1531 struct tmpfs_fid *tfhp; 1532 struct tmpfs_node *node; 1533 1534 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1535 node = VP_TO_TMPFS_NODE(ap->a_vp); 1536 1537 tfhp->tf_len = sizeof(struct tmpfs_fid); 1538 tfhp->tf_id = node->tn_id; 1539 tfhp->tf_gen = node->tn_gen; 1540 1541 return (0); 1542 } 1543 1544 /* --------------------------------------------------------------------- */ 1545 1546 /* 1547 * vnode operations vector used for files stored in a tmpfs file system. 1548 */ 1549 struct vop_vector tmpfs_vnodeop_entries = { 1550 .vop_default = &default_vnodeops, 1551 .vop_lookup = vfs_cache_lookup, 1552 .vop_cachedlookup = tmpfs_lookup, 1553 .vop_create = tmpfs_create, 1554 .vop_mknod = tmpfs_mknod, 1555 .vop_open = tmpfs_open, 1556 .vop_close = tmpfs_close, 1557 .vop_access = tmpfs_access, 1558 .vop_getattr = tmpfs_getattr, 1559 .vop_setattr = tmpfs_setattr, 1560 .vop_read = tmpfs_read, 1561 .vop_write = tmpfs_write, 1562 .vop_fsync = tmpfs_fsync, 1563 .vop_remove = tmpfs_remove, 1564 .vop_link = tmpfs_link, 1565 .vop_rename = tmpfs_rename, 1566 .vop_mkdir = tmpfs_mkdir, 1567 .vop_rmdir = tmpfs_rmdir, 1568 .vop_symlink = tmpfs_symlink, 1569 .vop_readdir = tmpfs_readdir, 1570 .vop_readlink = tmpfs_readlink, 1571 .vop_inactive = tmpfs_inactive, 1572 .vop_reclaim = tmpfs_reclaim, 1573 .vop_print = tmpfs_print, 1574 .vop_pathconf = tmpfs_pathconf, 1575 .vop_vptofh = tmpfs_vptofh, 1576 .vop_bmap = VOP_EOPNOTSUPP, 1577 }; 1578 1579