tmpfs_vnops.c revision 229363
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: head/sys/fs/tmpfs/tmpfs_vnops.c 229363 2012-01-03 03:29:01Z alc $"); 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 65static int 66tmpfs_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 194out: 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 204static int 205tmpfs_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 218static int 219tmpfs_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 235static int 236tmpfs_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 268static int 269tmpfs_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 283int 284tmpfs_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 331out: 332 MPASS(VOP_ISLOCKED(vp)); 333 334 return error; 335} 336 337/* --------------------------------------------------------------------- */ 338 339int 340tmpfs_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... */ 378int 379tmpfs_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/* --------------------------------------------------------------------- */ 435static int 436tmpfs_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_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); 459out: 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 470static __inline int 471tmpfs_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 491static int 492tmpfs_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); 513lookupvpg: 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_reference(m); 522 vm_page_sleep(m, "tmfsmr"); 523 goto lookupvpg; 524 } 525 vm_page_busy(m); 526 VM_OBJECT_UNLOCK(vobj); 527 error = uiomove_fromphys(&m, offset, tlen, uio); 528 VM_OBJECT_LOCK(vobj); 529 vm_page_wakeup(m); 530 VM_OBJECT_UNLOCK(vobj); 531 return (error); 532 } else if (m != NULL && uio->uio_segflg == UIO_NOCOPY) { 533 KASSERT(offset == 0, 534 ("unexpected offset in tmpfs_mappedread for sendfile")); 535 if ((m->oflags & VPO_BUSY) != 0) { 536 /* 537 * Reference the page before unlocking and sleeping so 538 * that the page daemon is less likely to reclaim it. 539 */ 540 vm_page_reference(m); 541 vm_page_sleep(m, "tmfsmr"); 542 goto lookupvpg; 543 } 544 vm_page_busy(m); 545 VM_OBJECT_UNLOCK(vobj); 546 sched_pin(); 547 sf = sf_buf_alloc(m, SFB_CPUPRIVATE); 548 ma = (char *)sf_buf_kva(sf); 549 error = tmpfs_nocacheread_buf(tobj, idx, 0, tlen, ma); 550 if (error == 0) { 551 if (tlen != PAGE_SIZE) 552 bzero(ma + tlen, PAGE_SIZE - tlen); 553 uio->uio_offset += tlen; 554 uio->uio_resid -= tlen; 555 } 556 sf_buf_free(sf); 557 sched_unpin(); 558 VM_OBJECT_LOCK(vobj); 559 if (error == 0) 560 m->valid = VM_PAGE_BITS_ALL; 561 vm_page_wakeup(m); 562 VM_OBJECT_UNLOCK(vobj); 563 return (error); 564 } 565 VM_OBJECT_UNLOCK(vobj); 566nocache: 567 error = tmpfs_nocacheread(tobj, idx, offset, tlen, uio); 568 569 return (error); 570} 571 572static int 573tmpfs_read(struct vop_read_args *v) 574{ 575 struct vnode *vp = v->a_vp; 576 struct uio *uio = v->a_uio; 577 578 struct tmpfs_node *node; 579 vm_object_t uobj; 580 size_t len; 581 int resid; 582 583 int error = 0; 584 585 node = VP_TO_TMPFS_NODE(vp); 586 587 if (vp->v_type != VREG) { 588 error = EISDIR; 589 goto out; 590 } 591 592 if (uio->uio_offset < 0) { 593 error = EINVAL; 594 goto out; 595 } 596 597 node->tn_status |= TMPFS_NODE_ACCESSED; 598 599 uobj = node->tn_reg.tn_aobj; 600 while ((resid = uio->uio_resid) > 0) { 601 error = 0; 602 if (node->tn_size <= uio->uio_offset) 603 break; 604 len = MIN(node->tn_size - uio->uio_offset, resid); 605 if (len == 0) 606 break; 607 error = tmpfs_mappedread(vp->v_object, uobj, len, uio); 608 if ((error != 0) || (resid == uio->uio_resid)) 609 break; 610 } 611 612out: 613 614 return error; 615} 616 617/* --------------------------------------------------------------------- */ 618 619static int 620tmpfs_mappedwrite(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 621{ 622 vm_pindex_t idx; 623 vm_page_t vpg, tpg; 624 vm_offset_t offset; 625 off_t addr; 626 size_t tlen; 627 int error; 628 629 error = 0; 630 631 addr = uio->uio_offset; 632 idx = OFF_TO_IDX(addr); 633 offset = addr & PAGE_MASK; 634 tlen = MIN(PAGE_SIZE - offset, len); 635 636 if ((vobj == NULL) || 637 (vobj->resident_page_count == 0 && vobj->cache == NULL)) { 638 vpg = NULL; 639 goto nocache; 640 } 641 642 VM_OBJECT_LOCK(vobj); 643lookupvpg: 644 if (((vpg = vm_page_lookup(vobj, idx)) != NULL) && 645 vm_page_is_valid(vpg, offset, tlen)) { 646 if ((vpg->oflags & VPO_BUSY) != 0) { 647 /* 648 * Reference the page before unlocking and sleeping so 649 * that the page daemon is less likely to reclaim it. 650 */ 651 vm_page_reference(vpg); 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 } 665nocache: 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_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); 688out: 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 710static int 711tmpfs_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 778out: 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 787static int 788tmpfs_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 801static int 802tmpfs_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 if (v->a_cnp->cn_flags & DOWHITEOUT) 838 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 839 840 /* Free the directory entry we just deleted. Note that the node 841 * referred by it will not be removed until the vnode is really 842 * reclaimed. */ 843 tmpfs_free_dirent(tmp, de, TRUE); 844 845 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 846 error = 0; 847 848out: 849 850 return error; 851} 852 853/* --------------------------------------------------------------------- */ 854 855static int 856tmpfs_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 if (cnp->cn_flags & ISWHITEOUT) 908 tmpfs_dir_whiteout_remove(dvp, cnp); 909 tmpfs_dir_attach(dvp, de); 910 911 /* vp link count has changed, so update node times. */ 912 node->tn_status |= TMPFS_NODE_CHANGED; 913 tmpfs_update(vp); 914 915 error = 0; 916 917out: 918 return error; 919} 920 921/* --------------------------------------------------------------------- */ 922 923static int 924tmpfs_rename(struct vop_rename_args *v) 925{ 926 struct vnode *fdvp = v->a_fdvp; 927 struct vnode *fvp = v->a_fvp; 928 struct componentname *fcnp = v->a_fcnp; 929 struct vnode *tdvp = v->a_tdvp; 930 struct vnode *tvp = v->a_tvp; 931 struct componentname *tcnp = v->a_tcnp; 932 933 char *newname; 934 int error; 935 struct tmpfs_dirent *de; 936 struct tmpfs_mount *tmp; 937 struct tmpfs_node *fdnode; 938 struct tmpfs_node *fnode; 939 struct tmpfs_node *tnode; 940 struct tmpfs_node *tdnode; 941 942 MPASS(VOP_ISLOCKED(tdvp)); 943 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 944 MPASS(fcnp->cn_flags & HASBUF); 945 MPASS(tcnp->cn_flags & HASBUF); 946 947 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 948 949 /* Disallow cross-device renames. 950 * XXX Why isn't this done by the caller? */ 951 if (fvp->v_mount != tdvp->v_mount || 952 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 953 error = EXDEV; 954 goto out; 955 } 956 957 tmp = VFS_TO_TMPFS(tdvp->v_mount); 958 tdnode = VP_TO_TMPFS_DIR(tdvp); 959 960 /* If source and target are the same file, there is nothing to do. */ 961 if (fvp == tvp) { 962 error = 0; 963 goto out; 964 } 965 966 /* If we need to move the directory between entries, lock the 967 * source so that we can safely operate on it. */ 968 if (fdvp != tdvp && fdvp != tvp) 969 vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 970 fdnode = VP_TO_TMPFS_DIR(fdvp); 971 fnode = VP_TO_TMPFS_NODE(fvp); 972 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 973 974 /* Entry can disappear before we lock fdvp, 975 * also avoid manipulating '.' and '..' entries. */ 976 if (de == NULL) { 977 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 978 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 979 error = EINVAL; 980 else 981 error = ENOENT; 982 goto out_locked; 983 } 984 MPASS(de->td_node == fnode); 985 986 /* If re-naming a directory to another preexisting directory 987 * ensure that the target directory is empty so that its 988 * removal causes no side effects. 989 * Kern_rename gurantees the destination to be a directory 990 * if the source is one. */ 991 if (tvp != NULL) { 992 MPASS(tnode != NULL); 993 994 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 995 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 996 error = EPERM; 997 goto out_locked; 998 } 999 1000 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 1001 if (tnode->tn_size > 0) { 1002 error = ENOTEMPTY; 1003 goto out_locked; 1004 } 1005 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 1006 error = ENOTDIR; 1007 goto out_locked; 1008 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 1009 error = EISDIR; 1010 goto out_locked; 1011 } else { 1012 MPASS(fnode->tn_type != VDIR && 1013 tnode->tn_type != VDIR); 1014 } 1015 } 1016 1017 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 1018 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 1019 error = EPERM; 1020 goto out_locked; 1021 } 1022 1023 /* Ensure that we have enough memory to hold the new name, if it 1024 * has to be changed. */ 1025 if (fcnp->cn_namelen != tcnp->cn_namelen || 1026 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 1027 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 1028 } else 1029 newname = NULL; 1030 1031 /* If the node is being moved to another directory, we have to do 1032 * the move. */ 1033 if (fdnode != tdnode) { 1034 /* In case we are moving a directory, we have to adjust its 1035 * parent to point to the new parent. */ 1036 if (de->td_node->tn_type == VDIR) { 1037 struct tmpfs_node *n; 1038 1039 /* Ensure the target directory is not a child of the 1040 * directory being moved. Otherwise, we'd end up 1041 * with stale nodes. */ 1042 n = tdnode; 1043 /* TMPFS_LOCK garanties that no nodes are freed while 1044 * traversing the list. Nodes can only be marked as 1045 * removed: tn_parent == NULL. */ 1046 TMPFS_LOCK(tmp); 1047 TMPFS_NODE_LOCK(n); 1048 while (n != n->tn_dir.tn_parent) { 1049 struct tmpfs_node *parent; 1050 1051 if (n == fnode) { 1052 TMPFS_NODE_UNLOCK(n); 1053 TMPFS_UNLOCK(tmp); 1054 error = EINVAL; 1055 if (newname != NULL) 1056 free(newname, M_TMPFSNAME); 1057 goto out_locked; 1058 } 1059 parent = n->tn_dir.tn_parent; 1060 TMPFS_NODE_UNLOCK(n); 1061 if (parent == NULL) { 1062 n = NULL; 1063 break; 1064 } 1065 TMPFS_NODE_LOCK(parent); 1066 if (parent->tn_dir.tn_parent == NULL) { 1067 TMPFS_NODE_UNLOCK(parent); 1068 n = NULL; 1069 break; 1070 } 1071 n = parent; 1072 } 1073 TMPFS_UNLOCK(tmp); 1074 if (n == NULL) { 1075 error = EINVAL; 1076 if (newname != NULL) 1077 free(newname, M_TMPFSNAME); 1078 goto out_locked; 1079 } 1080 TMPFS_NODE_UNLOCK(n); 1081 1082 /* Adjust the parent pointer. */ 1083 TMPFS_VALIDATE_DIR(fnode); 1084 TMPFS_NODE_LOCK(de->td_node); 1085 de->td_node->tn_dir.tn_parent = tdnode; 1086 TMPFS_NODE_UNLOCK(de->td_node); 1087 1088 /* As a result of changing the target of the '..' 1089 * entry, the link count of the source and target 1090 * directories has to be adjusted. */ 1091 TMPFS_NODE_LOCK(tdnode); 1092 TMPFS_ASSERT_LOCKED(tdnode); 1093 tdnode->tn_links++; 1094 TMPFS_NODE_UNLOCK(tdnode); 1095 1096 TMPFS_NODE_LOCK(fdnode); 1097 TMPFS_ASSERT_LOCKED(fdnode); 1098 fdnode->tn_links--; 1099 TMPFS_NODE_UNLOCK(fdnode); 1100 } 1101 1102 /* Do the move: just remove the entry from the source directory 1103 * and insert it into the target one. */ 1104 tmpfs_dir_detach(fdvp, de); 1105 if (fcnp->cn_flags & DOWHITEOUT) 1106 tmpfs_dir_whiteout_add(fdvp, fcnp); 1107 if (tcnp->cn_flags & ISWHITEOUT) 1108 tmpfs_dir_whiteout_remove(tdvp, tcnp); 1109 tmpfs_dir_attach(tdvp, de); 1110 } 1111 1112 /* If the name has changed, we need to make it effective by changing 1113 * it in the directory entry. */ 1114 if (newname != NULL) { 1115 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1116 1117 free(de->td_name, M_TMPFSNAME); 1118 de->td_namelen = (uint16_t)tcnp->cn_namelen; 1119 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 1120 de->td_name = newname; 1121 1122 fnode->tn_status |= TMPFS_NODE_CHANGED; 1123 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1124 } 1125 1126 /* If we are overwriting an entry, we have to remove the old one 1127 * from the target directory. */ 1128 if (tvp != NULL) { 1129 /* Remove the old entry from the target directory. */ 1130 de = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1131 tmpfs_dir_detach(tdvp, de); 1132 1133 /* Free the directory entry we just deleted. Note that the 1134 * node referred by it will not be removed until the vnode is 1135 * really reclaimed. */ 1136 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 1137 } 1138 cache_purge(fvp); 1139 1140 error = 0; 1141 1142out_locked: 1143 if (fdvp != tdvp && fdvp != tvp) 1144 VOP_UNLOCK(fdvp, 0); 1145 1146out: 1147 /* Release target nodes. */ 1148 /* XXX: I don't understand when tdvp can be the same as tvp, but 1149 * other code takes care of this... */ 1150 if (tdvp == tvp) 1151 vrele(tdvp); 1152 else 1153 vput(tdvp); 1154 if (tvp != NULL) 1155 vput(tvp); 1156 1157 /* Release source nodes. */ 1158 vrele(fdvp); 1159 vrele(fvp); 1160 1161 return error; 1162} 1163 1164/* --------------------------------------------------------------------- */ 1165 1166static int 1167tmpfs_mkdir(struct vop_mkdir_args *v) 1168{ 1169 struct vnode *dvp = v->a_dvp; 1170 struct vnode **vpp = v->a_vpp; 1171 struct componentname *cnp = v->a_cnp; 1172 struct vattr *vap = v->a_vap; 1173 1174 MPASS(vap->va_type == VDIR); 1175 1176 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1177} 1178 1179/* --------------------------------------------------------------------- */ 1180 1181static int 1182tmpfs_rmdir(struct vop_rmdir_args *v) 1183{ 1184 struct vnode *dvp = v->a_dvp; 1185 struct vnode *vp = v->a_vp; 1186 1187 int error; 1188 struct tmpfs_dirent *de; 1189 struct tmpfs_mount *tmp; 1190 struct tmpfs_node *dnode; 1191 struct tmpfs_node *node; 1192 1193 MPASS(VOP_ISLOCKED(dvp)); 1194 MPASS(VOP_ISLOCKED(vp)); 1195 1196 tmp = VFS_TO_TMPFS(dvp->v_mount); 1197 dnode = VP_TO_TMPFS_DIR(dvp); 1198 node = VP_TO_TMPFS_DIR(vp); 1199 1200 /* Directories with more than two entries ('.' and '..') cannot be 1201 * removed. */ 1202 if (node->tn_size > 0) { 1203 error = ENOTEMPTY; 1204 goto out; 1205 } 1206 1207 if ((dnode->tn_flags & APPEND) 1208 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1209 error = EPERM; 1210 goto out; 1211 } 1212 1213 /* This invariant holds only if we are not trying to remove "..". 1214 * We checked for that above so this is safe now. */ 1215 MPASS(node->tn_dir.tn_parent == dnode); 1216 1217 /* Get the directory entry associated with node (vp). This was 1218 * filled by tmpfs_lookup while looking up the entry. */ 1219 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1220 MPASS(TMPFS_DIRENT_MATCHES(de, 1221 v->a_cnp->cn_nameptr, 1222 v->a_cnp->cn_namelen)); 1223 1224 /* Check flags to see if we are allowed to remove the directory. */ 1225 if (dnode->tn_flags & APPEND 1226 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1227 error = EPERM; 1228 goto out; 1229 } 1230 1231 1232 /* Detach the directory entry from the directory (dnode). */ 1233 tmpfs_dir_detach(dvp, de); 1234 if (v->a_cnp->cn_flags & DOWHITEOUT) 1235 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1236 1237 /* No vnode should be allocated for this entry from this point */ 1238 TMPFS_NODE_LOCK(node); 1239 TMPFS_ASSERT_ELOCKED(node); 1240 node->tn_links--; 1241 node->tn_dir.tn_parent = NULL; 1242 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1243 TMPFS_NODE_MODIFIED; 1244 1245 TMPFS_NODE_UNLOCK(node); 1246 1247 TMPFS_NODE_LOCK(dnode); 1248 TMPFS_ASSERT_ELOCKED(dnode); 1249 dnode->tn_links--; 1250 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1251 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1252 TMPFS_NODE_UNLOCK(dnode); 1253 1254 cache_purge(dvp); 1255 cache_purge(vp); 1256 1257 /* Free the directory entry we just deleted. Note that the node 1258 * referred by it will not be removed until the vnode is really 1259 * reclaimed. */ 1260 tmpfs_free_dirent(tmp, de, TRUE); 1261 1262 /* Release the deleted vnode (will destroy the node, notify 1263 * interested parties and clean it from the cache). */ 1264 1265 dnode->tn_status |= TMPFS_NODE_CHANGED; 1266 tmpfs_update(dvp); 1267 1268 error = 0; 1269 1270out: 1271 return error; 1272} 1273 1274/* --------------------------------------------------------------------- */ 1275 1276static int 1277tmpfs_symlink(struct vop_symlink_args *v) 1278{ 1279 struct vnode *dvp = v->a_dvp; 1280 struct vnode **vpp = v->a_vpp; 1281 struct componentname *cnp = v->a_cnp; 1282 struct vattr *vap = v->a_vap; 1283 char *target = v->a_target; 1284 1285#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1286 MPASS(vap->va_type == VLNK); 1287#else 1288 vap->va_type = VLNK; 1289#endif 1290 1291 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1292} 1293 1294/* --------------------------------------------------------------------- */ 1295 1296static int 1297tmpfs_readdir(struct vop_readdir_args *v) 1298{ 1299 struct vnode *vp = v->a_vp; 1300 struct uio *uio = v->a_uio; 1301 int *eofflag = v->a_eofflag; 1302 u_long **cookies = v->a_cookies; 1303 int *ncookies = v->a_ncookies; 1304 1305 int error; 1306 off_t startoff; 1307 off_t cnt = 0; 1308 struct tmpfs_node *node; 1309 1310 /* This operation only makes sense on directory nodes. */ 1311 if (vp->v_type != VDIR) 1312 return ENOTDIR; 1313 1314 node = VP_TO_TMPFS_DIR(vp); 1315 1316 startoff = uio->uio_offset; 1317 1318 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1319 error = tmpfs_dir_getdotdent(node, uio); 1320 if (error != 0) 1321 goto outok; 1322 cnt++; 1323 } 1324 1325 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1326 error = tmpfs_dir_getdotdotdent(node, uio); 1327 if (error != 0) 1328 goto outok; 1329 cnt++; 1330 } 1331 1332 error = tmpfs_dir_getdents(node, uio, &cnt); 1333 1334outok: 1335 MPASS(error >= -1); 1336 1337 if (error == -1) 1338 error = (cnt != 0) ? 0 : EINVAL; 1339 1340 if (eofflag != NULL) 1341 *eofflag = 1342 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1343 1344 /* Update NFS-related variables. */ 1345 if (error == 0 && cookies != NULL && ncookies != NULL) { 1346 off_t i; 1347 off_t off = startoff; 1348 struct tmpfs_dirent *de = NULL; 1349 1350 *ncookies = cnt; 1351 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1352 1353 for (i = 0; i < cnt; i++) { 1354 MPASS(off != TMPFS_DIRCOOKIE_EOF); 1355 if (off == TMPFS_DIRCOOKIE_DOT) { 1356 off = TMPFS_DIRCOOKIE_DOTDOT; 1357 } else { 1358 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1359 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead); 1360 } else if (de != NULL) { 1361 de = TAILQ_NEXT(de, td_entries); 1362 } else { 1363 de = tmpfs_dir_lookupbycookie(node, 1364 off); 1365 MPASS(de != NULL); 1366 de = TAILQ_NEXT(de, td_entries); 1367 } 1368 if (de == NULL) 1369 off = TMPFS_DIRCOOKIE_EOF; 1370 else 1371 off = tmpfs_dircookie(de); 1372 } 1373 1374 (*cookies)[i] = off; 1375 } 1376 MPASS(uio->uio_offset == off); 1377 } 1378 1379 return error; 1380} 1381 1382/* --------------------------------------------------------------------- */ 1383 1384static int 1385tmpfs_readlink(struct vop_readlink_args *v) 1386{ 1387 struct vnode *vp = v->a_vp; 1388 struct uio *uio = v->a_uio; 1389 1390 int error; 1391 struct tmpfs_node *node; 1392 1393 MPASS(uio->uio_offset == 0); 1394 MPASS(vp->v_type == VLNK); 1395 1396 node = VP_TO_TMPFS_NODE(vp); 1397 1398 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1399 uio); 1400 node->tn_status |= TMPFS_NODE_ACCESSED; 1401 1402 return error; 1403} 1404 1405/* --------------------------------------------------------------------- */ 1406 1407static int 1408tmpfs_inactive(struct vop_inactive_args *v) 1409{ 1410 struct vnode *vp = v->a_vp; 1411 struct thread *l = v->a_td; 1412 1413 struct tmpfs_node *node; 1414 1415 MPASS(VOP_ISLOCKED(vp)); 1416 1417 node = VP_TO_TMPFS_NODE(vp); 1418 1419 if (node->tn_links == 0) 1420 vrecycle(vp, l); 1421 1422 return 0; 1423} 1424 1425/* --------------------------------------------------------------------- */ 1426 1427int 1428tmpfs_reclaim(struct vop_reclaim_args *v) 1429{ 1430 struct vnode *vp = v->a_vp; 1431 1432 struct tmpfs_mount *tmp; 1433 struct tmpfs_node *node; 1434 1435 node = VP_TO_TMPFS_NODE(vp); 1436 tmp = VFS_TO_TMPFS(vp->v_mount); 1437 1438 vnode_destroy_vobject(vp); 1439 cache_purge(vp); 1440 1441 TMPFS_NODE_LOCK(node); 1442 TMPFS_ASSERT_ELOCKED(node); 1443 tmpfs_free_vp(vp); 1444 1445 /* If the node referenced by this vnode was deleted by the user, 1446 * we must free its associated data structures (now that the vnode 1447 * is being reclaimed). */ 1448 if (node->tn_links == 0 && 1449 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1450 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1451 TMPFS_NODE_UNLOCK(node); 1452 tmpfs_free_node(tmp, node); 1453 } else 1454 TMPFS_NODE_UNLOCK(node); 1455 1456 MPASS(vp->v_data == NULL); 1457 return 0; 1458} 1459 1460/* --------------------------------------------------------------------- */ 1461 1462static int 1463tmpfs_print(struct vop_print_args *v) 1464{ 1465 struct vnode *vp = v->a_vp; 1466 1467 struct tmpfs_node *node; 1468 1469 node = VP_TO_TMPFS_NODE(vp); 1470 1471 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1472 node, node->tn_flags, node->tn_links); 1473 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1474 ", status 0x%x\n", 1475 node->tn_mode, node->tn_uid, node->tn_gid, 1476 (uintmax_t)node->tn_size, node->tn_status); 1477 1478 if (vp->v_type == VFIFO) 1479 fifo_printinfo(vp); 1480 1481 printf("\n"); 1482 1483 return 0; 1484} 1485 1486/* --------------------------------------------------------------------- */ 1487 1488static int 1489tmpfs_pathconf(struct vop_pathconf_args *v) 1490{ 1491 int name = v->a_name; 1492 register_t *retval = v->a_retval; 1493 1494 int error; 1495 1496 error = 0; 1497 1498 switch (name) { 1499 case _PC_LINK_MAX: 1500 *retval = LINK_MAX; 1501 break; 1502 1503 case _PC_NAME_MAX: 1504 *retval = NAME_MAX; 1505 break; 1506 1507 case _PC_PATH_MAX: 1508 *retval = PATH_MAX; 1509 break; 1510 1511 case _PC_PIPE_BUF: 1512 *retval = PIPE_BUF; 1513 break; 1514 1515 case _PC_CHOWN_RESTRICTED: 1516 *retval = 1; 1517 break; 1518 1519 case _PC_NO_TRUNC: 1520 *retval = 1; 1521 break; 1522 1523 case _PC_SYNC_IO: 1524 *retval = 1; 1525 break; 1526 1527 case _PC_FILESIZEBITS: 1528 *retval = 0; /* XXX Don't know which value should I return. */ 1529 break; 1530 1531 default: 1532 error = EINVAL; 1533 } 1534 1535 return error; 1536} 1537 1538static int 1539tmpfs_vptofh(struct vop_vptofh_args *ap) 1540{ 1541 struct tmpfs_fid *tfhp; 1542 struct tmpfs_node *node; 1543 1544 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1545 node = VP_TO_TMPFS_NODE(ap->a_vp); 1546 1547 tfhp->tf_len = sizeof(struct tmpfs_fid); 1548 tfhp->tf_id = node->tn_id; 1549 tfhp->tf_gen = node->tn_gen; 1550 1551 return (0); 1552} 1553 1554static int 1555tmpfs_whiteout(struct vop_whiteout_args *ap) 1556{ 1557 struct vnode *dvp = ap->a_dvp; 1558 struct componentname *cnp = ap->a_cnp; 1559 struct tmpfs_dirent *de; 1560 1561 switch (ap->a_flags) { 1562 case LOOKUP: 1563 return (0); 1564 case CREATE: 1565 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1566 if (de != NULL) 1567 return (de->td_node == NULL ? 0 : EEXIST); 1568 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1569 case DELETE: 1570 tmpfs_dir_whiteout_remove(dvp, cnp); 1571 return (0); 1572 default: 1573 panic("tmpfs_whiteout: unknown op"); 1574 } 1575} 1576 1577/* --------------------------------------------------------------------- */ 1578 1579/* 1580 * vnode operations vector used for files stored in a tmpfs file system. 1581 */ 1582struct vop_vector tmpfs_vnodeop_entries = { 1583 .vop_default = &default_vnodeops, 1584 .vop_lookup = vfs_cache_lookup, 1585 .vop_cachedlookup = tmpfs_lookup, 1586 .vop_create = tmpfs_create, 1587 .vop_mknod = tmpfs_mknod, 1588 .vop_open = tmpfs_open, 1589 .vop_close = tmpfs_close, 1590 .vop_access = tmpfs_access, 1591 .vop_getattr = tmpfs_getattr, 1592 .vop_setattr = tmpfs_setattr, 1593 .vop_read = tmpfs_read, 1594 .vop_write = tmpfs_write, 1595 .vop_fsync = tmpfs_fsync, 1596 .vop_remove = tmpfs_remove, 1597 .vop_link = tmpfs_link, 1598 .vop_rename = tmpfs_rename, 1599 .vop_mkdir = tmpfs_mkdir, 1600 .vop_rmdir = tmpfs_rmdir, 1601 .vop_symlink = tmpfs_symlink, 1602 .vop_readdir = tmpfs_readdir, 1603 .vop_readlink = tmpfs_readlink, 1604 .vop_inactive = tmpfs_inactive, 1605 .vop_reclaim = tmpfs_reclaim, 1606 .vop_print = tmpfs_print, 1607 .vop_pathconf = tmpfs_pathconf, 1608 .vop_vptofh = tmpfs_vptofh, 1609 .vop_whiteout = tmpfs_whiteout, 1610 .vop_bmap = VOP_EOPNOTSUPP, 1611}; 1612 1613